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Reid Spencer5f016e22007-07-11 17:01:13 +00001//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===//
2//
3// The LLVM Compiler Infrastructure
4//
Chris Lattner0bc735f2007-12-29 19:59:25 +00005// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
Reid Spencer5f016e22007-07-11 17:01:13 +00007//
8//===----------------------------------------------------------------------===//
9//
10// This file implements semantic analysis for declarations.
11//
12//===----------------------------------------------------------------------===//
13
14#include "Sema.h"
Douglas Gregor20093b42009-12-09 23:02:17 +000015#include "SemaInit.h"
John McCall7d384dd2009-11-18 07:57:50 +000016#include "Lookup.h"
Anders Carlssonc44eec62008-07-03 04:20:39 +000017#include "clang/AST/APValue.h"
Chris Lattnere1e79852008-02-06 00:51:33 +000018#include "clang/AST/ASTConsumer.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000019#include "clang/AST/ASTContext.h"
Douglas Gregora8f32e02009-10-06 17:59:45 +000020#include "clang/AST/CXXInheritance.h"
Douglas Gregoraaba5e32009-02-04 19:02:06 +000021#include "clang/AST/DeclTemplate.h"
Chris Lattner6b6b5372008-06-26 18:38:35 +000022#include "clang/AST/ExprCXX.h"
Sebastian Redld3a413d2009-04-26 20:35:05 +000023#include "clang/AST/StmtCXX.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000024#include "clang/Parse/DeclSpec.h"
Douglas Gregora786fdb2009-10-13 23:27:22 +000025#include "clang/Parse/ParseDiagnostic.h"
Douglas Gregor314b97f2009-11-10 19:49:08 +000026#include "clang/Parse/Template.h"
Anders Carlssonb7906612009-08-26 23:45:07 +000027#include "clang/Basic/PartialDiagnostic.h"
Steve Naroff4c49a6c2008-01-30 23:46:05 +000028#include "clang/Basic/SourceManager.h"
Anders Carlssonb7906612009-08-26 23:45:07 +000029#include "clang/Basic/TargetInfo.h"
Steve Naroff4c49a6c2008-01-30 23:46:05 +000030// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's)
Chris Lattnere1e79852008-02-06 00:51:33 +000031#include "clang/Lex/Preprocessor.h"
Mike Stump1eb44332009-09-09 15:08:12 +000032#include "clang/Lex/HeaderSearch.h"
John McCall66755862009-12-24 09:58:38 +000033#include "llvm/ADT/Triple.h"
Douglas Gregor6ed40e32008-12-23 21:05:05 +000034#include <algorithm>
Douglas Gregor9a8c9a22009-09-28 21:14:19 +000035#include <cstring>
Douglas Gregor6ed40e32008-12-23 21:05:05 +000036#include <functional>
Reid Spencer5f016e22007-07-11 17:01:13 +000037using namespace clang;
38
Chris Lattner21ff9c92009-03-05 01:25:28 +000039/// getDeclName - Return a pretty name for the specified decl if possible, or
Mike Stump1eb44332009-09-09 15:08:12 +000040/// an empty string if not. This is used for pretty crash reporting.
Chris Lattnerb28317a2009-03-28 19:18:32 +000041std::string Sema::getDeclName(DeclPtrTy d) {
42 Decl *D = d.getAs<Decl>();
Chris Lattner21ff9c92009-03-05 01:25:28 +000043 if (NamedDecl *DN = dyn_cast_or_null<NamedDecl>(D))
44 return DN->getQualifiedNameAsString();
45 return "";
46}
47
Chris Lattner682bf922009-03-29 16:50:03 +000048Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(DeclPtrTy Ptr) {
49 return DeclGroupPtrTy::make(DeclGroupRef(Ptr.getAs<Decl>()));
50}
51
Douglas Gregord6efafa2009-02-04 19:16:12 +000052/// \brief If the identifier refers to a type name within this scope,
53/// return the declaration of that type.
54///
55/// This routine performs ordinary name lookup of the identifier II
56/// within the given scope, with optional C++ scope specifier SS, to
Douglas Gregor1a51b4a2009-02-09 15:09:02 +000057/// determine whether the name refers to a type. If so, returns an
58/// opaque pointer (actually a QualType) corresponding to that
59/// type. Otherwise, returns NULL.
Douglas Gregord6efafa2009-02-04 19:16:12 +000060///
61/// If name lookup results in an ambiguity, this routine will complain
62/// and then return NULL.
Douglas Gregor1a51b4a2009-02-09 15:09:02 +000063Sema::TypeTy *Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +000064 Scope *S, CXXScopeSpec *SS,
Douglas Gregorf6e6fc82009-11-20 22:03:38 +000065 bool isClassName,
66 TypeTy *ObjectTypePtr) {
67 // Determine where we will perform name lookup.
68 DeclContext *LookupCtx = 0;
69 if (ObjectTypePtr) {
70 QualType ObjectType = QualType::getFromOpaquePtr(ObjectTypePtr);
71 if (ObjectType->isRecordType())
72 LookupCtx = computeDeclContext(ObjectType);
Jeffrey Yasskinedc28772010-04-07 23:29:58 +000073 } else if (SS && SS->isNotEmpty()) {
Douglas Gregorf6e6fc82009-11-20 22:03:38 +000074 LookupCtx = computeDeclContext(*SS, false);
75
76 if (!LookupCtx) {
77 if (isDependentScopeSpecifier(*SS)) {
78 // C++ [temp.res]p3:
79 // A qualified-id that refers to a type and in which the
80 // nested-name-specifier depends on a template-parameter (14.6.2)
81 // shall be prefixed by the keyword typename to indicate that the
82 // qualified-id denotes a type, forming an
83 // elaborated-type-specifier (7.1.5.3).
84 //
85 // We therefore do not perform any name lookup if the result would
86 // refer to a member of an unknown specialization.
87 if (!isClassName)
88 return 0;
89
John McCall33500952010-06-11 00:33:02 +000090 // We know from the grammar that this name refers to a type,
91 // so build a dependent node to describe the type.
Douglas Gregor107de902010-04-24 15:35:55 +000092 return CheckTypenameType(ETK_None,
Abramo Bagnarae4da7a02010-05-19 21:37:53 +000093 (NestedNameSpecifier *)SS->getScopeRep(), II,
94 SourceLocation(), SS->getRange(), NameLoc
95 ).getAsOpaquePtr();
Douglas Gregorf6e6fc82009-11-20 22:03:38 +000096 }
97
Douglas Gregor42c39f32009-08-26 18:27:52 +000098 return 0;
Douglas Gregorf6e6fc82009-11-20 22:03:38 +000099 }
100
John McCall77bb1aa2010-05-01 00:40:08 +0000101 if (!LookupCtx->isDependentContext() &&
102 RequireCompleteDeclContext(*SS, LookupCtx))
Douglas Gregorf6e6fc82009-11-20 22:03:38 +0000103 return 0;
Douglas Gregor42c39f32009-08-26 18:27:52 +0000104 }
Eli Friedman0f0615b2009-12-21 01:42:38 +0000105
106 // FIXME: LookupNestedNameSpecifierName isn't the right kind of
107 // lookup for class-names.
108 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName :
109 LookupOrdinaryName;
110 LookupResult Result(*this, &II, NameLoc, Kind);
Douglas Gregorf6e6fc82009-11-20 22:03:38 +0000111 if (LookupCtx) {
112 // Perform "qualified" name lookup into the declaration context we
113 // computed, which is either the type of the base of a member access
114 // expression or the declaration context associated with a prior
115 // nested-name-specifier.
116 LookupQualifiedName(Result, LookupCtx);
Douglas Gregor42af25f2009-05-11 19:58:34 +0000117
Douglas Gregorf6e6fc82009-11-20 22:03:38 +0000118 if (ObjectTypePtr && Result.empty()) {
119 // C++ [basic.lookup.classref]p3:
120 // If the unqualified-id is ~type-name, the type-name is looked up
121 // in the context of the entire postfix-expression. If the type T of
122 // the object expression is of a class type C, the type-name is also
123 // looked up in the scope of class C. At least one of the lookups shall
124 // find a name that refers to (possibly cv-qualified) T.
125 LookupName(Result, S);
126 }
127 } else {
128 // Perform unqualified name lookup.
129 LookupName(Result, S);
130 }
131
Chris Lattner22bd9052009-02-16 22:07:16 +0000132 NamedDecl *IIDecl = 0;
John McCalla24dc2e2009-11-17 02:14:36 +0000133 switch (Result.getResultKind()) {
Chris Lattner22bd9052009-02-16 22:07:16 +0000134 case LookupResult::NotFound:
Douglas Gregor7d3f5762010-01-15 01:44:47 +0000135 case LookupResult::NotFoundInCurrentInstantiation:
Chris Lattner22bd9052009-02-16 22:07:16 +0000136 case LookupResult::FoundOverloaded:
John McCall7ba107a2009-11-18 02:36:19 +0000137 case LookupResult::FoundUnresolvedValue:
John McCallc373d482010-01-27 01:50:18 +0000138 Result.suppressDiagnostics();
Chris Lattner22bd9052009-02-16 22:07:16 +0000139 return 0;
Douglas Gregorb696ea32009-02-04 17:00:24 +0000140
Chris Lattnera64ef0a2009-10-25 22:09:09 +0000141 case LookupResult::Ambiguous:
John McCall6e247262009-10-10 05:48:19 +0000142 // Recover from type-hiding ambiguities by hiding the type. We'll
143 // do the lookup again when looking for an object, and we can
144 // diagnose the error then. If we don't do this, then the error
145 // about hiding the type will be immediately followed by an error
146 // that only makes sense if the identifier was treated like a type.
John McCalla24dc2e2009-11-17 02:14:36 +0000147 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) {
148 Result.suppressDiagnostics();
John McCall6e247262009-10-10 05:48:19 +0000149 return 0;
John McCalla24dc2e2009-11-17 02:14:36 +0000150 }
John McCall6e247262009-10-10 05:48:19 +0000151
Douglas Gregor31a19b62009-04-01 21:51:26 +0000152 // Look to see if we have a type anywhere in the list of results.
153 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end();
154 Res != ResEnd; ++Res) {
155 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) {
Mike Stump1eb44332009-09-09 15:08:12 +0000156 if (!IIDecl ||
157 (*Res)->getLocation().getRawEncoding() <
Douglas Gregor841b53c2009-04-13 15:14:38 +0000158 IIDecl->getLocation().getRawEncoding())
159 IIDecl = *Res;
Douglas Gregor31a19b62009-04-01 21:51:26 +0000160 }
161 }
162
163 if (!IIDecl) {
164 // None of the entities we found is a type, so there is no way
165 // to even assume that the result is a type. In this case, don't
166 // complain about the ambiguity. The parser will either try to
167 // perform this lookup again (e.g., as an object name), which
168 // will produce the ambiguity, or will complain that it expected
169 // a type name.
John McCalla24dc2e2009-11-17 02:14:36 +0000170 Result.suppressDiagnostics();
Douglas Gregor31a19b62009-04-01 21:51:26 +0000171 return 0;
172 }
173
174 // We found a type within the ambiguous lookup; diagnose the
175 // ambiguity and then return that type. This might be the right
176 // answer, or it might not be, but it suppresses any attempt to
177 // perform the name lookup again.
Douglas Gregor31a19b62009-04-01 21:51:26 +0000178 break;
Douglas Gregorb696ea32009-02-04 17:00:24 +0000179
Chris Lattner22bd9052009-02-16 22:07:16 +0000180 case LookupResult::Found:
John McCallf36e02d2009-10-09 21:13:30 +0000181 IIDecl = Result.getFoundDecl();
Chris Lattner22bd9052009-02-16 22:07:16 +0000182 break;
Douglas Gregor7176fff2009-01-15 00:26:24 +0000183 }
184
Chris Lattner10ca3372009-10-25 17:16:46 +0000185 assert(IIDecl && "Didn't find decl");
John McCall54abf7d2009-11-04 02:18:39 +0000186
Chris Lattner10ca3372009-10-25 17:16:46 +0000187 QualType T;
188 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) {
John McCall54abf7d2009-11-04 02:18:39 +0000189 DiagnoseUseOfDecl(IIDecl, NameLoc);
John McCalla24dc2e2009-11-17 02:14:36 +0000190
Chris Lattner10ca3372009-10-25 17:16:46 +0000191 if (T.isNull())
192 T = Context.getTypeDeclType(TD);
193
Douglas Gregore6258932009-03-19 00:39:20 +0000194 if (SS)
Abramo Bagnara465d41b2010-05-11 21:36:43 +0000195 T = getElaboratedType(ETK_None, *SS, T);
Chris Lattner10ca3372009-10-25 17:16:46 +0000196
197 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) {
Chris Lattner10ca3372009-10-25 17:16:46 +0000198 T = Context.getObjCInterfaceType(IDecl);
John McCalla24dc2e2009-11-17 02:14:36 +0000199 } else {
200 // If it's not plausibly a type, suppress diagnostics.
201 Result.suppressDiagnostics();
Chris Lattner10ca3372009-10-25 17:16:46 +0000202 return 0;
John McCalla24dc2e2009-11-17 02:14:36 +0000203 }
Douglas Gregore4e5b052009-03-19 00:18:19 +0000204
Chris Lattner10ca3372009-10-25 17:16:46 +0000205 return T.getAsOpaquePtr();
Reid Spencer5f016e22007-07-11 17:01:13 +0000206}
207
Chris Lattner4c97d762009-04-12 21:49:30 +0000208/// isTagName() - This method is called *for error recovery purposes only*
209/// to determine if the specified name is a valid tag name ("struct foo"). If
210/// so, this returns the TST for the tag corresponding to it (TST_enum,
211/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C
212/// where the user forgot to specify the tag.
213DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) {
214 // Do a tag name lookup in this scope.
John McCalla24dc2e2009-11-17 02:14:36 +0000215 LookupResult R(*this, &II, SourceLocation(), LookupTagName);
216 LookupName(R, S, false);
217 R.suppressDiagnostics();
218 if (R.getResultKind() == LookupResult::Found)
John McCall1bcee0a2009-12-02 08:25:40 +0000219 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) {
Chris Lattner4c97d762009-04-12 21:49:30 +0000220 switch (TD->getTagKind()) {
Abramo Bagnara465d41b2010-05-11 21:36:43 +0000221 default: return DeclSpec::TST_unspecified;
222 case TTK_Struct: return DeclSpec::TST_struct;
223 case TTK_Union: return DeclSpec::TST_union;
224 case TTK_Class: return DeclSpec::TST_class;
225 case TTK_Enum: return DeclSpec::TST_enum;
Chris Lattner4c97d762009-04-12 21:49:30 +0000226 }
227 }
Mike Stump1eb44332009-09-09 15:08:12 +0000228
Chris Lattner4c97d762009-04-12 21:49:30 +0000229 return DeclSpec::TST_unspecified;
230}
231
Douglas Gregora786fdb2009-10-13 23:27:22 +0000232bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II,
233 SourceLocation IILoc,
234 Scope *S,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +0000235 CXXScopeSpec *SS,
Douglas Gregora786fdb2009-10-13 23:27:22 +0000236 TypeTy *&SuggestedType) {
237 // We don't have anything to suggest (yet).
238 SuggestedType = 0;
239
Douglas Gregor546be3c2009-12-30 17:04:44 +0000240 // There may have been a typo in the name of the type. Look up typo
241 // results, in case we have something that we can suggest.
242 LookupResult Lookup(*this, &II, IILoc, LookupOrdinaryName,
243 NotForRedeclaration);
244
Douglas Gregoraaf87162010-04-14 20:04:41 +0000245 if (DeclarationName Corrected = CorrectTypo(Lookup, S, SS, 0, 0, CTC_Type)) {
246 if (NamedDecl *Result = Lookup.getAsSingle<NamedDecl>()) {
247 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) &&
248 !Result->isInvalidDecl()) {
249 // We found a similarly-named type or interface; suggest that.
250 if (!SS || !SS->isSet())
251 Diag(IILoc, diag::err_unknown_typename_suggest)
252 << &II << Lookup.getLookupName()
253 << FixItHint::CreateReplacement(SourceRange(IILoc),
254 Result->getNameAsString());
255 else if (DeclContext *DC = computeDeclContext(*SS, false))
256 Diag(IILoc, diag::err_unknown_nested_typename_suggest)
257 << &II << DC << Lookup.getLookupName() << SS->getRange()
258 << FixItHint::CreateReplacement(SourceRange(IILoc),
259 Result->getNameAsString());
260 else
261 llvm_unreachable("could not have corrected a typo here");
Douglas Gregor546be3c2009-12-30 17:04:44 +0000262
Douglas Gregoraaf87162010-04-14 20:04:41 +0000263 Diag(Result->getLocation(), diag::note_previous_decl)
264 << Result->getDeclName();
265
266 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS);
267 return true;
268 }
269 } else if (Lookup.empty()) {
270 // We corrected to a keyword.
271 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it.
272 Diag(IILoc, diag::err_unknown_typename_suggest)
273 << &II << Corrected;
274 return true;
Douglas Gregor546be3c2009-12-30 17:04:44 +0000275 }
276 }
277
Jeffrey Yasskinc173be22010-04-08 21:04:54 +0000278 if (getLangOptions().CPlusPlus) {
279 // See if II is a class template that the user forgot to pass arguments to.
280 UnqualifiedId Name;
281 Name.setIdentifier(&II, IILoc);
282 CXXScopeSpec EmptySS;
283 TemplateTy TemplateResult;
Douglas Gregor1fd6d442010-05-21 23:18:07 +0000284 bool MemberOfUnknownSpecialization;
285 if (isTemplateName(S, SS ? *SS : EmptySS, Name, 0, true, TemplateResult,
286 MemberOfUnknownSpecialization) == TNK_Type_template) {
Jeffrey Yasskinc173be22010-04-08 21:04:54 +0000287 TemplateName TplName = TemplateResult.getAsVal<TemplateName>();
288 Diag(IILoc, diag::err_template_missing_args) << TplName;
289 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) {
290 Diag(TplDecl->getLocation(), diag::note_template_decl_here)
291 << TplDecl->getTemplateParameters()->getSourceRange();
292 }
293 return true;
294 }
295 }
296
Douglas Gregora786fdb2009-10-13 23:27:22 +0000297 // FIXME: Should we move the logic that tries to recover from a missing tag
298 // (struct, union, enum) from Parser::ParseImplicitInt here, instead?
299
Douglas Gregor546be3c2009-12-30 17:04:44 +0000300 if (!SS || (!SS->isSet() && !SS->isInvalid()))
Douglas Gregora786fdb2009-10-13 23:27:22 +0000301 Diag(IILoc, diag::err_unknown_typename) << &II;
302 else if (DeclContext *DC = computeDeclContext(*SS, false))
303 Diag(IILoc, diag::err_typename_nested_not_found)
304 << &II << DC << SS->getRange();
305 else if (isDependentScopeSpecifier(*SS)) {
306 Diag(SS->getRange().getBegin(), diag::err_typename_missing)
Daniel Dunbar01eb9b92009-10-18 21:17:35 +0000307 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName()
Douglas Gregora786fdb2009-10-13 23:27:22 +0000308 << SourceRange(SS->getRange().getBegin(), IILoc)
Douglas Gregor849b2432010-03-31 17:46:05 +0000309 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename ");
Douglas Gregor1a15dae2010-06-16 22:31:08 +0000310 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc).get();
Douglas Gregora786fdb2009-10-13 23:27:22 +0000311 } else {
312 assert(SS && SS->isInvalid() &&
313 "Invalid scope specifier has already been diagnosed");
314 }
315
316 return true;
317}
Chris Lattner4c97d762009-04-12 21:49:30 +0000318
John McCall88232aa2009-08-18 00:00:49 +0000319// Determines the context to return to after temporarily entering a
320// context. This depends in an unnecessarily complicated way on the
321// exact ordering of callbacks from the parser.
Argyrios Kyrtzidisef6e6472008-11-08 17:17:31 +0000322DeclContext *Sema::getContainingDC(DeclContext *DC) {
Argyrios Kyrtzidisef6e6472008-11-08 17:17:31 +0000323
John McCall88232aa2009-08-18 00:00:49 +0000324 // Functions defined inline within classes aren't parsed until we've
325 // finished parsing the top-level class, so the top-level class is
326 // the context we'll need to return to.
327 if (isa<FunctionDecl>(DC)) {
328 DC = DC->getLexicalParent();
329
330 // A function not defined within a class will always return to its
331 // lexical context.
332 if (!isa<CXXRecordDecl>(DC))
333 return DC;
334
335 // A C++ inline method/friend is parsed *after* the topmost class
336 // it was declared in is fully parsed ("complete"); the topmost
337 // class is the context we need to return to.
Argyrios Kyrtzidis77407b82008-11-19 18:01:13 +0000338 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent()))
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000339 DC = RD;
340
341 // Return the declaration context of the topmost class the inline method is
342 // declared in.
343 return DC;
344 }
345
Argyrios Kyrtzidis52393042008-11-09 23:41:00 +0000346 if (isa<ObjCMethodDecl>(DC))
347 return Context.getTranslationUnitDecl();
348
Argyrios Kyrtzidis77407b82008-11-19 18:01:13 +0000349 return DC->getLexicalParent();
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000350}
351
Douglas Gregor44b43212008-12-11 16:49:14 +0000352void Sema::PushDeclContext(Scope *S, DeclContext *DC) {
Argyrios Kyrtzidisef6e6472008-11-08 17:17:31 +0000353 assert(getContainingDC(DC) == CurContext &&
Zhongxing Xue50897a2008-12-08 07:14:51 +0000354 "The next DeclContext should be lexically contained in the current one.");
Chris Lattner9fdf9c62008-04-22 18:39:57 +0000355 CurContext = DC;
Douglas Gregor44b43212008-12-11 16:49:14 +0000356 S->setEntity(DC);
Chris Lattner0ed844b2008-04-04 06:12:32 +0000357}
358
Chris Lattnerb048c982008-04-06 04:47:34 +0000359void Sema::PopDeclContext() {
360 assert(CurContext && "DeclContext imbalance!");
Douglas Gregor44b43212008-12-11 16:49:14 +0000361
Argyrios Kyrtzidisef6e6472008-11-08 17:17:31 +0000362 CurContext = getContainingDC(CurContext);
Chris Lattner0ed844b2008-04-04 06:12:32 +0000363}
364
Argyrios Kyrtzidis179fe1a2009-06-17 23:19:02 +0000365/// EnterDeclaratorContext - Used when we must lookup names in the context
366/// of a declarator's nested name specifier.
John McCall7a1dc562009-12-19 10:49:29 +0000367///
Argyrios Kyrtzidis1d175532009-06-17 23:15:40 +0000368void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) {
John McCall7a1dc562009-12-19 10:49:29 +0000369 // C++0x [basic.lookup.unqual]p13:
370 // A name used in the definition of a static data member of class
371 // X (after the qualified-id of the static member) is looked up as
372 // if the name was used in a member function of X.
373 // C++0x [basic.lookup.unqual]p14:
374 // If a variable member of a namespace is defined outside of the
375 // scope of its namespace then any name used in the definition of
376 // the variable member (after the declarator-id) is looked up as
377 // if the definition of the variable member occurred in its
378 // namespace.
379 // Both of these imply that we should push a scope whose context
380 // is the semantic context of the declaration. We can't use
381 // PushDeclContext here because that context is not necessarily
382 // lexically contained in the current context. Fortunately,
383 // the containing scope should have the appropriate information.
384
385 assert(!S->getEntity() && "scope already has entity");
386
387#ifndef NDEBUG
388 Scope *Ancestor = S->getParent();
389 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent();
390 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch");
391#endif
392
Argyrios Kyrtzidis1d175532009-06-17 23:15:40 +0000393 CurContext = DC;
John McCall7a1dc562009-12-19 10:49:29 +0000394 S->setEntity(DC);
Argyrios Kyrtzidis1d175532009-06-17 23:15:40 +0000395}
396
Argyrios Kyrtzidis1d175532009-06-17 23:15:40 +0000397void Sema::ExitDeclaratorContext(Scope *S) {
John McCall7a1dc562009-12-19 10:49:29 +0000398 assert(S->getEntity() == CurContext && "Context imbalance!");
Argyrios Kyrtzidis1d175532009-06-17 23:15:40 +0000399
John McCall7a1dc562009-12-19 10:49:29 +0000400 // Switch back to the lexical context. The safety of this is
401 // enforced by an assert in EnterDeclaratorContext.
402 Scope *Ancestor = S->getParent();
403 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent();
404 CurContext = (DeclContext*) Ancestor->getEntity();
405
406 // We don't need to do anything with the scope, which is going to
407 // disappear.
Argyrios Kyrtzidis1d175532009-06-17 23:15:40 +0000408}
409
Douglas Gregorf9201e02009-02-11 23:02:49 +0000410/// \brief Determine whether we allow overloading of the function
411/// PrevDecl with another declaration.
412///
413/// This routine determines whether overloading is possible, not
414/// whether some new function is actually an overload. It will return
415/// true in C++ (where we can always provide overloads) or, as an
416/// extension, in C when the previous function is already an
417/// overloaded function declaration or has the "overloadable"
418/// attribute.
John McCall68263142009-11-18 22:49:29 +0000419static bool AllowOverloadingOfFunction(LookupResult &Previous,
420 ASTContext &Context) {
Douglas Gregorf9201e02009-02-11 23:02:49 +0000421 if (Context.getLangOptions().CPlusPlus)
422 return true;
423
John McCall68263142009-11-18 22:49:29 +0000424 if (Previous.getResultKind() == LookupResult::FoundOverloaded)
Douglas Gregorf9201e02009-02-11 23:02:49 +0000425 return true;
426
John McCall68263142009-11-18 22:49:29 +0000427 return (Previous.getResultKind() == LookupResult::Found
428 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>());
Douglas Gregorf9201e02009-02-11 23:02:49 +0000429}
430
Argyrios Kyrtzidis87f3ff02008-04-12 00:47:19 +0000431/// Add this decl to the scope shadowed decl chains.
John McCallab88d972009-08-31 22:39:49 +0000432void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) {
Douglas Gregor074149e2009-01-05 19:45:36 +0000433 // Move up the scope chain until we find the nearest enclosing
434 // non-transparent context. The declaration will be introduced into this
435 // scope.
Mike Stump1eb44332009-09-09 15:08:12 +0000436 while (S->getEntity() &&
Douglas Gregor074149e2009-01-05 19:45:36 +0000437 ((DeclContext *)S->getEntity())->isTransparentContext())
438 S = S->getParent();
439
Douglas Gregor6ed40e32008-12-23 21:05:05 +0000440 // Add scoped declarations into their context, so that they can be
441 // found later. Declarations without a context won't be inserted
442 // into any context.
John McCallab88d972009-08-31 22:39:49 +0000443 if (AddToContext)
444 CurContext->addDecl(D);
Douglas Gregor6ed40e32008-12-23 21:05:05 +0000445
Chandler Carruth8761d682010-02-21 07:08:09 +0000446 // Out-of-line definitions shouldn't be pushed into scope in C++.
447 // Out-of-line variable and function definitions shouldn't even in C.
448 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) &&
449 D->isOutOfLine())
450 return;
451
452 // Template instantiations should also not be pushed into scope.
453 if (isa<FunctionDecl>(D) &&
454 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization())
Douglas Gregord04b1be2009-09-28 18:41:37 +0000455 return;
456
John McCallf36e02d2009-10-09 21:13:30 +0000457 // If this replaces anything in the current scope,
458 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()),
459 IEnd = IdResolver.end();
460 for (; I != IEnd; ++I) {
461 if (S->isDeclScope(DeclPtrTy::make(*I)) && D->declarationReplaces(*I)) {
462 S->RemoveDecl(DeclPtrTy::make(*I));
463 IdResolver.RemoveDecl(*I);
Argyrios Kyrtzidis00bc6452008-05-09 23:39:43 +0000464
John McCallf36e02d2009-10-09 21:13:30 +0000465 // Should only need to replace one decl.
466 break;
Douglas Gregor516ff432009-04-24 02:57:34 +0000467 }
Argyrios Kyrtzidis00bc6452008-05-09 23:39:43 +0000468 }
Douglas Gregor8e9bebd2008-10-21 16:13:35 +0000469
John McCallf36e02d2009-10-09 21:13:30 +0000470 S->AddDecl(DeclPtrTy::make(D));
Argyrios Kyrtzidis00bc6452008-05-09 23:39:43 +0000471 IdResolver.AddDecl(D);
Argyrios Kyrtzidis87f3ff02008-04-12 00:47:19 +0000472}
473
Douglas Gregor2531c2d2009-09-28 00:47:05 +0000474bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S) {
Douglas Gregor2531c2d2009-09-28 00:47:05 +0000475 return IdResolver.isDeclInScope(D, Ctx, Context, S);
476}
477
John McCall68263142009-11-18 22:49:29 +0000478static bool isOutOfScopePreviousDeclaration(NamedDecl *,
479 DeclContext*,
480 ASTContext&);
481
482/// Filters out lookup results that don't fall within the given scope
483/// as determined by isDeclInScope.
484static void FilterLookupForScope(Sema &SemaRef, LookupResult &R,
485 DeclContext *Ctx, Scope *S,
486 bool ConsiderLinkage) {
487 LookupResult::Filter F = R.makeFilter();
488 while (F.hasNext()) {
489 NamedDecl *D = F.next();
490
491 if (SemaRef.isDeclInScope(D, Ctx, S))
492 continue;
493
494 if (ConsiderLinkage &&
495 isOutOfScopePreviousDeclaration(D, Ctx, SemaRef.Context))
496 continue;
497
498 F.erase();
499 }
500
501 F.done();
502}
503
504static bool isUsingDecl(NamedDecl *D) {
505 return isa<UsingShadowDecl>(D) ||
506 isa<UnresolvedUsingTypenameDecl>(D) ||
507 isa<UnresolvedUsingValueDecl>(D);
508}
509
510/// Removes using shadow declarations from the lookup results.
511static void RemoveUsingDecls(LookupResult &R) {
512 LookupResult::Filter F = R.makeFilter();
513 while (F.hasNext())
514 if (isUsingDecl(F.next()))
515 F.erase();
516
517 F.done();
518}
519
Anders Carlsson99a000e2009-11-07 07:18:14 +0000520static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) {
John McCall86ff3082010-02-04 22:26:26 +0000521 if (D->isInvalidDecl())
522 return false;
523
Anders Carlssonf7613d52009-11-07 07:26:56 +0000524 if (D->isUsed() || D->hasAttr<UnusedAttr>())
525 return false;
John McCall86ff3082010-02-04 22:26:26 +0000526
527 // White-list anything that isn't a local variable.
528 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) ||
529 !D->getDeclContext()->isFunctionOrMethod())
530 return false;
531
532 // Types of valid local variables should be complete, so this should succeed.
Anders Carlssonf7613d52009-11-07 07:26:56 +0000533 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) {
John McCallaec58602010-03-31 02:47:45 +0000534
535 // White-list anything with an __attribute__((unused)) type.
536 QualType Ty = VD->getType();
537
538 // Only look at the outermost level of typedef.
539 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) {
540 if (TT->getDecl()->hasAttr<UnusedAttr>())
541 return false;
542 }
543
Douglas Gregor5764f612010-05-08 23:05:03 +0000544 // If we failed to complete the type for some reason, or if the type is
545 // dependent, don't diagnose the variable.
546 if (Ty->isIncompleteType() || Ty->isDependentType())
Douglas Gregora6a292b2010-04-27 16:20:13 +0000547 return false;
548
John McCallaec58602010-03-31 02:47:45 +0000549 if (const TagType *TT = Ty->getAs<TagType>()) {
550 const TagDecl *Tag = TT->getDecl();
551 if (Tag->hasAttr<UnusedAttr>())
552 return false;
553
554 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) {
Douglas Gregor5764f612010-05-08 23:05:03 +0000555 // FIXME: Checking for the presence of a user-declared constructor
556 // isn't completely accurate; we'd prefer to check that the initializer
557 // has no side effects.
558 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor())
Anders Carlssonf7613d52009-11-07 07:26:56 +0000559 return false;
560 }
561 }
John McCallaec58602010-03-31 02:47:45 +0000562
563 // TODO: __attribute__((unused)) templates?
Anders Carlssonf7613d52009-11-07 07:26:56 +0000564 }
565
John McCall86ff3082010-02-04 22:26:26 +0000566 return true;
Anders Carlsson99a000e2009-11-07 07:18:14 +0000567}
568
Douglas Gregor5764f612010-05-08 23:05:03 +0000569void Sema::DiagnoseUnusedDecl(const NamedDecl *D) {
570 if (!ShouldDiagnoseUnusedDecl(D))
571 return;
572
573 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable())
574 Diag(D->getLocation(), diag::warn_unused_exception_param)
575 << D->getDeclName();
576 else
577 Diag(D->getLocation(), diag::warn_unused_variable)
578 << D->getDeclName();
579}
580
Steve Naroffb216c882007-10-09 22:01:59 +0000581void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) {
Chris Lattner31e05722007-08-26 06:24:45 +0000582 if (S->decl_empty()) return;
Douglas Gregor72c3f312008-12-05 18:15:24 +0000583 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) &&
Mike Stump1eb44332009-09-09 15:08:12 +0000584 "Scope shouldn't contain decls!");
Argyrios Kyrtzidis00bc6452008-05-09 23:39:43 +0000585
Reid Spencer5f016e22007-07-11 17:01:13 +0000586 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end();
587 I != E; ++I) {
Chris Lattnerb28317a2009-03-28 19:18:32 +0000588 Decl *TmpD = (*I).getAs<Decl>();
Steve Naroffc752d042007-09-13 18:10:37 +0000589 assert(TmpD && "This decl didn't get pushed??");
Argyrios Kyrtzidis76435362008-06-10 01:32:09 +0000590
Douglas Gregor44b43212008-12-11 16:49:14 +0000591 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?");
592 NamedDecl *D = cast<NamedDecl>(TmpD);
Argyrios Kyrtzidis76435362008-06-10 01:32:09 +0000593
Douglas Gregor44b43212008-12-11 16:49:14 +0000594 if (!D->getDeclName()) continue;
Chris Lattner7f925cc2008-04-11 07:00:53 +0000595
Douglas Gregorb5352cf2009-10-08 21:35:42 +0000596 // Diagnose unused variables in this scope.
Douglas Gregor5764f612010-05-08 23:05:03 +0000597 if (S->getNumErrorsAtStart() == getDiagnostics().getNumErrors())
598 DiagnoseUnusedDecl(D);
599
Douglas Gregor44b43212008-12-11 16:49:14 +0000600 // Remove this name from our lexical scope.
601 IdResolver.RemoveDecl(D);
Reid Spencer5f016e22007-07-11 17:01:13 +0000602 }
603}
604
Douglas Gregorc83c6872010-04-15 22:33:43 +0000605/// \brief Look for an Objective-C class in the translation unit.
Douglas Gregorf06cdae2010-01-03 18:01:57 +0000606///
Douglas Gregorc83c6872010-04-15 22:33:43 +0000607/// \param Id The name of the Objective-C class we're looking for. If
Douglas Gregorf06cdae2010-01-03 18:01:57 +0000608/// typo-correction fixes this name, the Id will be updated
609/// to the fixed name.
610///
Douglas Gregorc83c6872010-04-15 22:33:43 +0000611/// \param IdLoc The location of the name in the translation unit.
612///
613/// \param TypoCorrection If true, this routine will attempt typo correction
614/// if there is no class with the given name.
615///
616/// \returns The declaration of the named Objective-C class, or NULL if the
617/// class could not be found.
Douglas Gregorf06cdae2010-01-03 18:01:57 +0000618ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id,
Douglas Gregorc83c6872010-04-15 22:33:43 +0000619 SourceLocation IdLoc,
620 bool TypoCorrection) {
Steve Naroff31102512008-04-02 18:30:49 +0000621 // The third "scope" argument is 0 since we aren't enabling lazy built-in
622 // creation from this context.
Douglas Gregorc83c6872010-04-15 22:33:43 +0000623 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName);
Mike Stump1eb44332009-09-09 15:08:12 +0000624
Douglas Gregorc83c6872010-04-15 22:33:43 +0000625 if (!IDecl && TypoCorrection) {
Douglas Gregorf06cdae2010-01-03 18:01:57 +0000626 // Perform typo correction at the given location, but only if we
627 // find an Objective-C class name.
Douglas Gregorc83c6872010-04-15 22:33:43 +0000628 LookupResult R(*this, Id, IdLoc, LookupOrdinaryName);
Douglas Gregoraaf87162010-04-14 20:04:41 +0000629 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) &&
Douglas Gregorf06cdae2010-01-03 18:01:57 +0000630 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) {
Douglas Gregorc83c6872010-04-15 22:33:43 +0000631 Diag(IdLoc, diag::err_undef_interface_suggest)
Douglas Gregorf06cdae2010-01-03 18:01:57 +0000632 << Id << IDecl->getDeclName()
Douglas Gregorc83c6872010-04-15 22:33:43 +0000633 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString());
Douglas Gregor67dd1d42010-01-07 00:17:44 +0000634 Diag(IDecl->getLocation(), diag::note_previous_decl)
635 << IDecl->getDeclName();
636
Douglas Gregorf06cdae2010-01-03 18:01:57 +0000637 Id = IDecl->getIdentifier();
638 }
639 }
640
Steve Naroffb327ce02008-04-02 14:35:35 +0000641 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl);
Fariborz Jahanian4cabdfc2007-10-12 19:38:20 +0000642}
643
Douglas Gregor1a0d31a2009-01-12 18:45:55 +0000644/// getNonFieldDeclScope - Retrieves the innermost scope, starting
645/// from S, where a non-field would be declared. This routine copes
646/// with the difference between C and C++ scoping rules in structs and
647/// unions. For example, the following code is well-formed in C but
648/// ill-formed in C++:
649/// @code
650/// struct S6 {
651/// enum { BAR } e;
652/// };
Mike Stump1eb44332009-09-09 15:08:12 +0000653///
Douglas Gregor1a0d31a2009-01-12 18:45:55 +0000654/// void test_S6() {
655/// struct S6 a;
656/// a.e = BAR;
657/// }
658/// @endcode
659/// For the declaration of BAR, this routine will return a different
660/// scope. The scope S will be the scope of the unnamed enumeration
661/// within S6. In C++, this routine will return the scope associated
662/// with S6, because the enumeration's scope is a transparent
663/// context but structures can contain non-field names. In C, this
664/// routine will return the translation unit scope, since the
665/// enumeration's scope is a transparent context and structures cannot
666/// contain non-field names.
667Scope *Sema::getNonFieldDeclScope(Scope *S) {
668 while (((S->getFlags() & Scope::DeclScope) == 0) ||
Mike Stump1eb44332009-09-09 15:08:12 +0000669 (S->getEntity() &&
Douglas Gregor1a0d31a2009-01-12 18:45:55 +0000670 ((DeclContext *)S->getEntity())->isTransparentContext()) ||
671 (S->isClassScope() && !getLangOptions().CPlusPlus))
672 S = S->getParent();
673 return S;
674}
675
Chris Lattner95e2c712008-05-05 22:18:14 +0000676void Sema::InitBuiltinVaListType() {
Anders Carlsson7c50aca2007-10-15 20:28:48 +0000677 if (!Context.getBuiltinVaListType().isNull())
678 return;
Mike Stump1eb44332009-09-09 15:08:12 +0000679
Anders Carlsson7c50aca2007-10-15 20:28:48 +0000680 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list");
Douglas Gregorc83c6872010-04-15 22:33:43 +0000681 NamedDecl *VaDecl = LookupSingleName(TUScope, VaIdent, SourceLocation(),
682 LookupOrdinaryName, ForRedeclaration);
Steve Naroff733002f2007-10-18 22:17:45 +0000683 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl);
Anders Carlsson7c50aca2007-10-15 20:28:48 +0000684 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef));
685}
686
Douglas Gregor3e41d602009-02-13 23:20:09 +0000687/// LazilyCreateBuiltin - The specified Builtin-ID was first used at
688/// file scope. lazily create a decl for it. ForRedeclaration is true
689/// if we're creating this built-in in anticipation of redeclaring the
690/// built-in.
Douglas Gregor4afa39d2009-01-20 01:17:11 +0000691NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid,
Douglas Gregor3e41d602009-02-13 23:20:09 +0000692 Scope *S, bool ForRedeclaration,
693 SourceLocation Loc) {
Reid Spencer5f016e22007-07-11 17:01:13 +0000694 Builtin::ID BID = (Builtin::ID)bid;
695
Chris Lattnerbd7eb1c2008-09-28 05:54:29 +0000696 if (Context.BuiltinInfo.hasVAListUse(BID))
Anders Carlsson7c50aca2007-10-15 20:28:48 +0000697 InitBuiltinVaListType();
Douglas Gregor3e41d602009-02-13 23:20:09 +0000698
Chris Lattner86df27b2009-06-14 00:45:47 +0000699 ASTContext::GetBuiltinTypeError Error;
Mike Stump1eb44332009-09-09 15:08:12 +0000700 QualType R = Context.GetBuiltinType(BID, Error);
Douglas Gregor370ab3f2009-02-14 01:52:53 +0000701 switch (Error) {
Chris Lattner86df27b2009-06-14 00:45:47 +0000702 case ASTContext::GE_None:
Douglas Gregor370ab3f2009-02-14 01:52:53 +0000703 // Okay
704 break;
705
Mike Stumpf711c412009-07-28 23:57:15 +0000706 case ASTContext::GE_Missing_stdio:
Douglas Gregor370ab3f2009-02-14 01:52:53 +0000707 if (ForRedeclaration)
708 Diag(Loc, diag::err_implicit_decl_requires_stdio)
709 << Context.BuiltinInfo.GetName(BID);
710 return 0;
Mike Stump782fa302009-07-28 02:25:19 +0000711
Mike Stumpf711c412009-07-28 23:57:15 +0000712 case ASTContext::GE_Missing_setjmp:
Mike Stump782fa302009-07-28 02:25:19 +0000713 if (ForRedeclaration)
714 Diag(Loc, diag::err_implicit_decl_requires_setjmp)
715 << Context.BuiltinInfo.GetName(BID);
716 return 0;
Douglas Gregor370ab3f2009-02-14 01:52:53 +0000717 }
Douglas Gregor3e41d602009-02-13 23:20:09 +0000718
719 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) {
720 Diag(Loc, diag::ext_implicit_lib_function_decl)
721 << Context.BuiltinInfo.GetName(BID)
722 << R;
Douglas Gregorb1152d82009-02-16 21:58:21 +0000723 if (Context.BuiltinInfo.getHeaderName(BID) &&
Chris Lattner6a7334d2009-04-16 03:59:32 +0000724 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl)
725 != Diagnostic::Ignored)
Douglas Gregor3e41d602009-02-13 23:20:09 +0000726 Diag(Loc, diag::note_please_include_header)
727 << Context.BuiltinInfo.getHeaderName(BID)
728 << Context.BuiltinInfo.GetName(BID);
729 }
730
Argyrios Kyrtzidisff898cd2008-04-17 14:47:13 +0000731 FunctionDecl *New = FunctionDecl::Create(Context,
732 Context.getTranslationUnitDecl(),
John McCalla93c9342009-12-07 02:54:59 +0000733 Loc, II, R, /*TInfo=*/0,
Douglas Gregor16573fa2010-04-19 22:54:31 +0000734 FunctionDecl::Extern,
735 FunctionDecl::None, false,
Douglas Gregor2224f842009-02-25 16:33:18 +0000736 /*hasPrototype=*/true);
Douglas Gregor3e41d602009-02-13 23:20:09 +0000737 New->setImplicit();
738
Chris Lattner95e2c712008-05-05 22:18:14 +0000739 // Create Decl objects for each parameter, adding them to the
740 // FunctionDecl.
Douglas Gregor72564e72009-02-26 23:50:07 +0000741 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) {
Chris Lattner95e2c712008-05-05 22:18:14 +0000742 llvm::SmallVector<ParmVarDecl*, 16> Params;
743 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i)
744 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0,
John McCalla93c9342009-12-07 02:54:59 +0000745 FT->getArgType(i), /*TInfo=*/0,
Douglas Gregor16573fa2010-04-19 22:54:31 +0000746 VarDecl::None, VarDecl::None, 0));
Douglas Gregor838db382010-02-11 01:19:42 +0000747 New->setParams(Params.data(), Params.size());
Chris Lattner95e2c712008-05-05 22:18:14 +0000748 }
Mike Stump1eb44332009-09-09 15:08:12 +0000749
750 AddKnownFunctionAttributes(New);
751
Chris Lattner7f925cc2008-04-11 07:00:53 +0000752 // TUScope is the translation-unit scope to insert this function into.
Douglas Gregora8cc8ce2009-01-09 18:51:29 +0000753 // FIXME: This is hideous. We need to teach PushOnScopeChains to
754 // relate Scopes to DeclContexts, and probably eliminate CurContext
755 // entirely, but we're not there yet.
756 DeclContext *SavedContext = CurContext;
757 CurContext = Context.getTranslationUnitDecl();
Argyrios Kyrtzidis00bc6452008-05-09 23:39:43 +0000758 PushOnScopeChains(New, TUScope);
Douglas Gregora8cc8ce2009-01-09 18:51:29 +0000759 CurContext = SavedContext;
Reid Spencer5f016e22007-07-11 17:01:13 +0000760 return New;
761}
762
Douglas Gregorcda9c672009-02-16 17:45:42 +0000763/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the
764/// same name and scope as a previous declaration 'Old'. Figure out
765/// how to resolve this situation, merging decls or emitting
Chris Lattnereaaebc72009-04-25 08:06:05 +0000766/// diagnostics as appropriate. If there was an error, set New to be invalid.
Reid Spencer5f016e22007-07-11 17:01:13 +0000767///
John McCall68263142009-11-18 22:49:29 +0000768void Sema::MergeTypeDefDecl(TypedefDecl *New, LookupResult &OldDecls) {
769 // If the new decl is known invalid already, don't bother doing any
770 // merging checks.
771 if (New->isInvalidDecl()) return;
Mike Stump1eb44332009-09-09 15:08:12 +0000772
Steve Naroff2b255c42008-09-09 14:32:20 +0000773 // Allow multiple definitions for ObjC built-in typedefs.
774 // FIXME: Verify the underlying types are equivalent!
775 if (getLangOptions().ObjC1) {
Chris Lattner2bac0f62008-11-20 05:41:43 +0000776 const IdentifierInfo *TypeID = New->getIdentifier();
777 switch (TypeID->getLength()) {
778 default: break;
Mike Stump1eb44332009-09-09 15:08:12 +0000779 case 2:
Chris Lattner2bac0f62008-11-20 05:41:43 +0000780 if (!TypeID->isStr("id"))
781 break;
David Chisnall0f436562009-08-17 16:35:33 +0000782 Context.ObjCIdRedefinitionType = New->getUnderlyingType();
Steve Naroff14108da2009-07-10 23:34:53 +0000783 // Install the built-in type for 'id', ignoring the current definition.
784 New->setTypeForDecl(Context.getObjCIdType().getTypePtr());
785 return;
Chris Lattner2bac0f62008-11-20 05:41:43 +0000786 case 5:
787 if (!TypeID->isStr("Class"))
788 break;
David Chisnall0f436562009-08-17 16:35:33 +0000789 Context.ObjCClassRedefinitionType = New->getUnderlyingType();
Steve Naroff14108da2009-07-10 23:34:53 +0000790 // Install the built-in type for 'Class', ignoring the current definition.
791 New->setTypeForDecl(Context.getObjCClassType().getTypePtr());
Chris Lattnereaaebc72009-04-25 08:06:05 +0000792 return;
Chris Lattner2bac0f62008-11-20 05:41:43 +0000793 case 3:
794 if (!TypeID->isStr("SEL"))
795 break;
Fariborz Jahanian369a3bd2009-11-25 23:07:42 +0000796 Context.ObjCSelRedefinitionType = New->getUnderlyingType();
Fariborz Jahanian13dcd002009-11-21 19:53:08 +0000797 // Install the built-in type for 'SEL', ignoring the current definition.
798 New->setTypeForDecl(Context.getObjCSelType().getTypePtr());
Chris Lattnereaaebc72009-04-25 08:06:05 +0000799 return;
Chris Lattner2bac0f62008-11-20 05:41:43 +0000800 case 8:
801 if (!TypeID->isStr("Protocol"))
802 break;
Steve Naroff2b255c42008-09-09 14:32:20 +0000803 Context.setObjCProtoType(New->getUnderlyingType());
Chris Lattnereaaebc72009-04-25 08:06:05 +0000804 return;
Steve Naroff2b255c42008-09-09 14:32:20 +0000805 }
806 // Fall through - the typedef name was not a builtin type.
807 }
John McCall68263142009-11-18 22:49:29 +0000808
Douglas Gregor66973122009-01-28 17:15:10 +0000809 // Verify the old decl was also a type.
John McCall5126fd02009-12-30 00:31:22 +0000810 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>();
811 if (!Old) {
Mike Stump1eb44332009-09-09 15:08:12 +0000812 Diag(New->getLocation(), diag::err_redefinition_different_kind)
Chris Lattner08631c52008-11-23 21:45:46 +0000813 << New->getDeclName();
John McCall68263142009-11-18 22:49:29 +0000814
815 NamedDecl *OldD = OldDecls.getRepresentativeDecl();
Chris Lattnereaaebc72009-04-25 08:06:05 +0000816 if (OldD->getLocation().isValid())
Fariborz Jahanianc55a2402009-01-16 19:58:32 +0000817 Diag(OldD->getLocation(), diag::note_previous_definition);
John McCall68263142009-11-18 22:49:29 +0000818
Chris Lattnereaaebc72009-04-25 08:06:05 +0000819 return New->setInvalidDecl();
Reid Spencer5f016e22007-07-11 17:01:13 +0000820 }
Douglas Gregor66973122009-01-28 17:15:10 +0000821
John McCall68263142009-11-18 22:49:29 +0000822 // If the old declaration is invalid, just give up here.
823 if (Old->isInvalidDecl())
824 return New->setInvalidDecl();
825
Mike Stump1eb44332009-09-09 15:08:12 +0000826 // Determine the "old" type we'll use for checking and diagnostics.
Douglas Gregor66973122009-01-28 17:15:10 +0000827 QualType OldType;
828 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old))
829 OldType = OldTypedef->getUnderlyingType();
830 else
831 OldType = Context.getTypeDeclType(Old);
832
Chris Lattner99cb9972008-07-25 18:44:27 +0000833 // If the typedef types are not identical, reject them in all languages and
834 // with any extensions enabled.
Douglas Gregor66973122009-01-28 17:15:10 +0000835
Mike Stump1eb44332009-09-09 15:08:12 +0000836 if (OldType != New->getUnderlyingType() &&
837 Context.getCanonicalType(OldType) !=
Chris Lattner99cb9972008-07-25 18:44:27 +0000838 Context.getCanonicalType(New->getUnderlyingType())) {
Chris Lattner5dc266a2008-11-20 06:13:02 +0000839 Diag(New->getLocation(), diag::err_redefinition_different_typedef)
Douglas Gregor66973122009-01-28 17:15:10 +0000840 << New->getUnderlyingType() << OldType;
Chris Lattnereaaebc72009-04-25 08:06:05 +0000841 if (Old->getLocation().isValid())
Fariborz Jahanianc55a2402009-01-16 19:58:32 +0000842 Diag(Old->getLocation(), diag::note_previous_definition);
Chris Lattnereaaebc72009-04-25 08:06:05 +0000843 return New->setInvalidDecl();
Chris Lattner99cb9972008-07-25 18:44:27 +0000844 }
Mike Stump1eb44332009-09-09 15:08:12 +0000845
John McCall5126fd02009-12-30 00:31:22 +0000846 // The types match. Link up the redeclaration chain if the old
847 // declaration was a typedef.
848 // FIXME: this is a potential source of wierdness if the type
849 // spellings don't match exactly.
850 if (isa<TypedefDecl>(Old))
851 New->setPreviousDeclaration(cast<TypedefDecl>(Old));
852
Steve Naroff14108da2009-07-10 23:34:53 +0000853 if (getLangOptions().Microsoft)
Chris Lattnereaaebc72009-04-25 08:06:05 +0000854 return;
Eli Friedman54ecfce2008-06-11 06:20:39 +0000855
Chris Lattner32b06752009-04-17 22:04:20 +0000856 if (getLangOptions().CPlusPlus) {
Douglas Gregor93dda722010-01-11 21:54:40 +0000857 // C++ [dcl.typedef]p2:
858 // In a given non-class scope, a typedef specifier can be used to
859 // redefine the name of any type declared in that scope to refer
860 // to the type to which it already refers.
Chris Lattner32b06752009-04-17 22:04:20 +0000861 if (!isa<CXXRecordDecl>(CurContext))
Chris Lattnereaaebc72009-04-25 08:06:05 +0000862 return;
Douglas Gregor93dda722010-01-11 21:54:40 +0000863
864 // C++0x [dcl.typedef]p4:
865 // In a given class scope, a typedef specifier can be used to redefine
866 // any class-name declared in that scope that is not also a typedef-name
867 // to refer to the type to which it already refers.
868 //
869 // This wording came in via DR424, which was a correction to the
870 // wording in DR56, which accidentally banned code like:
871 //
872 // struct S {
873 // typedef struct A { } A;
874 // };
875 //
876 // in the C++03 standard. We implement the C++0x semantics, which
877 // allow the above but disallow
878 //
879 // struct S {
880 // typedef int I;
881 // typedef int I;
882 // };
883 //
884 // since that was the intent of DR56.
Douglas Gregor05f65002010-01-11 22:30:10 +0000885 if (!isa<TypedefDecl >(Old))
Douglas Gregor93dda722010-01-11 21:54:40 +0000886 return;
887
Chris Lattner32b06752009-04-17 22:04:20 +0000888 Diag(New->getLocation(), diag::err_redefinition)
889 << New->getDeclName();
890 Diag(Old->getLocation(), diag::note_previous_definition);
Chris Lattnereaaebc72009-04-25 08:06:05 +0000891 return New->setInvalidDecl();
Daniel Dunbar2fe09972008-09-12 18:10:20 +0000892 }
Eli Friedman54ecfce2008-06-11 06:20:39 +0000893
Chris Lattner32b06752009-04-17 22:04:20 +0000894 // If we have a redefinition of a typedef in C, emit a warning. This warning
895 // is normally mapped to an error, but can be controlled with
Eli Friedman340a4e52009-06-04 23:03:07 +0000896 // -Wtypedef-redefinition. If either the original or the redefinition is
897 // in a system header, don't emit this for compatibility with GCC.
Chris Lattner6d97e5e2010-03-01 20:59:53 +0000898 if (getDiagnostics().getSuppressSystemWarnings() &&
Eli Friedman340a4e52009-06-04 23:03:07 +0000899 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) ||
900 Context.getSourceManager().isInSystemHeader(New->getLocation())))
Chris Lattnerd0359af2009-04-27 01:46:12 +0000901 return;
Mike Stump1eb44332009-09-09 15:08:12 +0000902
Chris Lattner32b06752009-04-17 22:04:20 +0000903 Diag(New->getLocation(), diag::warn_redefinition_of_typedef)
904 << New->getDeclName();
Chris Lattner5f4a6822008-11-23 23:12:31 +0000905 Diag(Old->getLocation(), diag::note_previous_definition);
Chris Lattnereaaebc72009-04-25 08:06:05 +0000906 return;
Reid Spencer5f016e22007-07-11 17:01:13 +0000907}
908
Chris Lattner6b6b5372008-06-26 18:38:35 +0000909/// DeclhasAttr - returns true if decl Declaration already has the target
910/// attribute.
Mike Stump1eb44332009-09-09 15:08:12 +0000911static bool
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000912DeclHasAttr(const Decl *decl, const Attr *target) {
913 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext())
Chris Lattnerddee4232008-03-03 03:28:21 +0000914 if (attr->getKind() == target->getKind())
915 return true;
916
917 return false;
918}
919
920/// MergeAttributes - append attributes from the Old decl to the New one.
Chris Lattnercc581472009-03-04 06:05:19 +0000921static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) {
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000922 for (const Attr *attr = Old->getAttrs(); attr; attr = attr->getNext()) {
923 if (!DeclHasAttr(New, attr) && attr->isMerged()) {
Douglas Gregor9f9bf252009-04-28 06:37:30 +0000924 Attr *NewAttr = attr->clone(C);
925 NewAttr->setInherited(true);
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000926 New->addAttr(NewAttr);
Chris Lattnerddee4232008-03-03 03:28:21 +0000927 }
928 }
929}
930
Douglas Gregorc8376562009-03-06 22:43:54 +0000931/// Used in MergeFunctionDecl to keep track of function parameters in
932/// C.
933struct GNUCompatibleParamWarning {
934 ParmVarDecl *OldParm;
935 ParmVarDecl *NewParm;
936 QualType PromotedType;
937};
938
Anders Carlsson5c478cf2009-12-04 22:33:25 +0000939
940/// getSpecialMember - get the special member enum for a method.
Anders Carlsson3b8c53b2010-04-22 05:40:53 +0000941Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) {
Anders Carlsson5c478cf2009-12-04 22:33:25 +0000942 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) {
Douglas Gregor9e9199d2009-12-22 00:34:07 +0000943 if (Ctor->isCopyConstructor())
Anders Carlsson5c478cf2009-12-04 22:33:25 +0000944 return Sema::CXXCopyConstructor;
Anders Carlsson3b8c53b2010-04-22 05:40:53 +0000945
946 return Sema::CXXConstructor;
Anders Carlsson5c478cf2009-12-04 22:33:25 +0000947 }
948
949 if (isa<CXXDestructorDecl>(MD))
950 return Sema::CXXDestructor;
951
952 assert(MD->isCopyAssignment() && "Must have copy assignment operator");
953 return Sema::CXXCopyAssignment;
954}
955
Sebastian Redl515ddd82010-06-09 21:17:41 +0000956/// canRedefineFunction - checks if a function can be redefined. Currently,
Charles Davisf3f8d2a2010-02-18 02:00:42 +0000957/// only extern inline functions can be redefined, and even then only in
958/// GNU89 mode.
959static bool canRedefineFunction(const FunctionDecl *FD,
960 const LangOptions& LangOpts) {
961 return (LangOpts.GNUMode && !LangOpts.C99 && !LangOpts.CPlusPlus &&
962 FD->isInlineSpecified() &&
963 FD->getStorageClass() == FunctionDecl::Extern);
964}
965
Chris Lattner04421082008-04-08 04:40:51 +0000966/// MergeFunctionDecl - We just parsed a function 'New' from
967/// declarator D which has the same name and scope as a previous
968/// declaration 'Old'. Figure out how to resolve this situation,
969/// merging decls or emitting diagnostics as appropriate.
Douglas Gregor8e9bebd2008-10-21 16:13:35 +0000970///
971/// In C++, New and Old must be declarations that are not
972/// overloaded. Use IsOverload to determine whether New and Old are
973/// overloaded, and to select the Old declaration that New should be
974/// merged with.
Douglas Gregorcda9c672009-02-16 17:45:42 +0000975///
976/// Returns true if there was an error, false otherwise.
977bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) {
Reid Spencer5f016e22007-07-11 17:01:13 +0000978 // Verify the old decl was also a function.
Douglas Gregore53060f2009-06-25 22:08:12 +0000979 FunctionDecl *Old = 0;
Mike Stump1eb44332009-09-09 15:08:12 +0000980 if (FunctionTemplateDecl *OldFunctionTemplate
Douglas Gregore53060f2009-06-25 22:08:12 +0000981 = dyn_cast<FunctionTemplateDecl>(OldD))
982 Old = OldFunctionTemplate->getTemplatedDecl();
Mike Stump1eb44332009-09-09 15:08:12 +0000983 else
Douglas Gregore53060f2009-06-25 22:08:12 +0000984 Old = dyn_cast<FunctionDecl>(OldD);
Reid Spencer5f016e22007-07-11 17:01:13 +0000985 if (!Old) {
John McCall41ce66f2009-12-10 19:51:03 +0000986 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) {
987 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse);
988 Diag(Shadow->getTargetDecl()->getLocation(),
989 diag::note_using_decl_target);
990 Diag(Shadow->getUsingDecl()->getLocation(),
991 diag::note_using_decl) << 0;
992 return true;
993 }
994
Chris Lattner5dc266a2008-11-20 06:13:02 +0000995 Diag(New->getLocation(), diag::err_redefinition_different_kind)
Chris Lattner08631c52008-11-23 21:45:46 +0000996 << New->getDeclName();
Chris Lattner5f4a6822008-11-23 23:12:31 +0000997 Diag(OldD->getLocation(), diag::note_previous_definition);
Douglas Gregorcda9c672009-02-16 17:45:42 +0000998 return true;
Reid Spencer5f016e22007-07-11 17:01:13 +0000999 }
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00001000
1001 // Determine whether the previous declaration was a definition,
1002 // implicit declaration, or a declaration.
1003 diag::kind PrevDiag;
1004 if (Old->isThisDeclarationADefinition())
Chris Lattner5f4a6822008-11-23 23:12:31 +00001005 PrevDiag = diag::note_previous_definition;
Douglas Gregorcda9c672009-02-16 17:45:42 +00001006 else if (Old->isImplicit())
1007 PrevDiag = diag::note_previous_implicit_declaration;
Mike Stump1eb44332009-09-09 15:08:12 +00001008 else
Chris Lattner5f4a6822008-11-23 23:12:31 +00001009 PrevDiag = diag::note_previous_declaration;
Mike Stump1eb44332009-09-09 15:08:12 +00001010
Chris Lattner8bcfc5b2008-04-06 23:10:54 +00001011 QualType OldQType = Context.getCanonicalType(Old->getType());
1012 QualType NewQType = Context.getCanonicalType(New->getType());
Mike Stump1eb44332009-09-09 15:08:12 +00001013
Charles Davisf3f8d2a2010-02-18 02:00:42 +00001014 // Don't complain about this if we're in GNU89 mode and the old function
1015 // is an extern inline function.
Douglas Gregor04495c82009-02-24 01:23:02 +00001016 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) &&
1017 New->getStorageClass() == FunctionDecl::Static &&
Charles Davisf3f8d2a2010-02-18 02:00:42 +00001018 Old->getStorageClass() != FunctionDecl::Static &&
1019 !canRedefineFunction(Old, getLangOptions())) {
Douglas Gregor04495c82009-02-24 01:23:02 +00001020 Diag(New->getLocation(), diag::err_static_non_static)
1021 << New;
1022 Diag(Old->getLocation(), PrevDiag);
1023 return true;
1024 }
1025
John McCallf82b4e82010-02-04 05:44:44 +00001026 // If a function is first declared with a calling convention, but is
1027 // later declared or defined without one, the second decl assumes the
1028 // calling convention of the first.
1029 //
1030 // For the new decl, we have to look at the NON-canonical type to tell the
1031 // difference between a function that really doesn't have a calling
1032 // convention and one that is declared cdecl. That's because in
1033 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away
1034 // because it is the default calling convention.
1035 //
1036 // Note also that we DO NOT return at this point, because we still have
1037 // other tests to run.
1038 const FunctionType *OldType = OldQType->getAs<FunctionType>();
1039 const FunctionType *NewType = New->getType()->getAs<FunctionType>();
Rafael Espindola264ba482010-03-30 20:24:48 +00001040 const FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo();
1041 const FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo();
1042 if (OldTypeInfo.getCC() != CC_Default &&
1043 NewTypeInfo.getCC() == CC_Default) {
1044 NewQType = Context.getCallConvType(NewQType, OldTypeInfo.getCC());
John McCallf82b4e82010-02-04 05:44:44 +00001045 New->setType(NewQType);
1046 NewQType = Context.getCanonicalType(NewQType);
Rafael Espindola264ba482010-03-30 20:24:48 +00001047 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(),
1048 NewTypeInfo.getCC())) {
John McCallf82b4e82010-02-04 05:44:44 +00001049 // Calling conventions really aren't compatible, so complain.
John McCall04a67a62010-02-05 21:31:56 +00001050 Diag(New->getLocation(), diag::err_cconv_change)
Rafael Espindola264ba482010-03-30 20:24:48 +00001051 << FunctionType::getNameForCallConv(NewTypeInfo.getCC())
1052 << (OldTypeInfo.getCC() == CC_Default)
1053 << (OldTypeInfo.getCC() == CC_Default ? "" :
1054 FunctionType::getNameForCallConv(OldTypeInfo.getCC()));
John McCall04a67a62010-02-05 21:31:56 +00001055 Diag(Old->getLocation(), diag::note_previous_declaration);
John McCallf82b4e82010-02-04 05:44:44 +00001056 return true;
1057 }
1058
John McCall04a67a62010-02-05 21:31:56 +00001059 // FIXME: diagnose the other way around?
Douglas Gregord2c64902010-06-18 21:30:25 +00001060 if (OldType->getNoReturnAttr() && !NewType->getNoReturnAttr()) {
John McCall04a67a62010-02-05 21:31:56 +00001061 NewQType = Context.getNoReturnType(NewQType);
1062 New->setType(NewQType);
1063 assert(NewQType.isCanonical());
1064 }
1065
Douglas Gregord2c64902010-06-18 21:30:25 +00001066 // Merge regparm attribute.
1067 if (OldType->getRegParmType() != NewType->getRegParmType()) {
1068 if (NewType->getRegParmType()) {
1069 Diag(New->getLocation(), diag::err_regparm_mismatch)
1070 << NewType->getRegParmType()
1071 << OldType->getRegParmType();
1072 Diag(Old->getLocation(), diag::note_previous_declaration);
1073 return true;
1074 }
1075
1076 NewQType = Context.getRegParmType(NewQType, OldType->getRegParmType());
1077 New->setType(NewQType);
1078 assert(NewQType.isCanonical());
1079 }
1080
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00001081 if (getLangOptions().CPlusPlus) {
1082 // (C++98 13.1p2):
1083 // Certain function declarations cannot be overloaded:
Mike Stump1eb44332009-09-09 15:08:12 +00001084 // -- Function declarations that differ only in the return type
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00001085 // cannot be overloaded.
Mike Stump1eb44332009-09-09 15:08:12 +00001086 QualType OldReturnType
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00001087 = cast<FunctionType>(OldQType.getTypePtr())->getResultType();
Mike Stump1eb44332009-09-09 15:08:12 +00001088 QualType NewReturnType
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00001089 = cast<FunctionType>(NewQType.getTypePtr())->getResultType();
Fariborz Jahanian2390a722010-05-19 21:37:30 +00001090 QualType ResQT;
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00001091 if (OldReturnType != NewReturnType) {
Fariborz Jahanian2390a722010-05-19 21:37:30 +00001092 if (NewReturnType->isObjCObjectPointerType()
1093 && OldReturnType->isObjCObjectPointerType())
1094 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType);
1095 if (ResQT.isNull()) {
1096 Diag(New->getLocation(), diag::err_ovl_diff_return_type);
1097 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
1098 return true;
1099 }
1100 else
1101 NewQType = ResQT;
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00001102 }
1103
1104 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old);
John McCall3d043362010-04-13 07:45:41 +00001105 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New);
Anders Carlsson5c478cf2009-12-04 22:33:25 +00001106 if (OldMethod && NewMethod) {
John McCall3d043362010-04-13 07:45:41 +00001107 // Preserve triviality.
1108 NewMethod->setTrivial(OldMethod->isTrivial());
1109
1110 bool isFriend = NewMethod->getFriendObjectKind();
1111
1112 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord()) {
Anders Carlsson5c478cf2009-12-04 22:33:25 +00001113 // -- Member function declarations with the same name and the
1114 // same parameter types cannot be overloaded if any of them
1115 // is a static member function declaration.
1116 if (OldMethod->isStatic() || NewMethod->isStatic()) {
1117 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member);
1118 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
1119 return true;
1120 }
1121
1122 // C++ [class.mem]p1:
1123 // [...] A member shall not be declared twice in the
1124 // member-specification, except that a nested class or member
1125 // class template can be declared and then later defined.
1126 unsigned NewDiag;
1127 if (isa<CXXConstructorDecl>(OldMethod))
1128 NewDiag = diag::err_constructor_redeclared;
1129 else if (isa<CXXDestructorDecl>(NewMethod))
1130 NewDiag = diag::err_destructor_redeclared;
1131 else if (isa<CXXConversionDecl>(NewMethod))
1132 NewDiag = diag::err_conv_function_redeclared;
1133 else
1134 NewDiag = diag::err_member_redeclared;
1135
1136 Diag(New->getLocation(), NewDiag);
Douglas Gregor3e41d602009-02-13 23:20:09 +00001137 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
John McCall3d043362010-04-13 07:45:41 +00001138
1139 // Complain if this is an explicit declaration of a special
1140 // member that was initially declared implicitly.
1141 //
1142 // As an exception, it's okay to befriend such methods in order
1143 // to permit the implicit constructor/destructor/operator calls.
1144 } else if (OldMethod->isImplicit()) {
1145 if (isFriend) {
1146 NewMethod->setImplicit();
1147 } else {
Anders Carlsson5c478cf2009-12-04 22:33:25 +00001148 Diag(NewMethod->getLocation(),
1149 diag::err_definition_of_implicitly_declared_member)
Anders Carlsson3b8c53b2010-04-22 05:40:53 +00001150 << New << getSpecialMember(OldMethod);
Anders Carlsson5c478cf2009-12-04 22:33:25 +00001151 return true;
1152 }
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00001153 }
1154 }
1155
1156 // (C++98 8.3.5p3):
1157 // All declarations for a function shall agree exactly in both the
1158 // return type and the parameter-type-list.
Nuno Lopesf75b8302009-12-23 23:40:33 +00001159 // attributes should be ignored when comparing.
1160 if (Context.getNoReturnType(OldQType, false) ==
1161 Context.getNoReturnType(NewQType, false))
Douglas Gregor04495c82009-02-24 01:23:02 +00001162 return MergeCompatibleFunctionDecls(New, Old);
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00001163
1164 // Fall through for conflicting redeclarations and redefinitions.
Douglas Gregorf0097952008-04-21 02:02:58 +00001165 }
Chris Lattner04421082008-04-08 04:40:51 +00001166
1167 // C: Function types need to be compatible, not identical. This handles
Steve Naroffadbbd0c2008-01-14 20:51:29 +00001168 // duplicate function decls like "void f(int); void f(enum X);" properly.
Chris Lattner04421082008-04-08 04:40:51 +00001169 if (!getLangOptions().CPlusPlus &&
Eli Friedman3d815e72008-08-22 00:56:42 +00001170 Context.typesAreCompatible(OldQType, NewQType)) {
John McCall183700f2009-09-21 23:43:11 +00001171 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>();
1172 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>();
Douglas Gregor72564e72009-02-26 23:50:07 +00001173 const FunctionProtoType *OldProto = 0;
1174 if (isa<FunctionNoProtoType>(NewFuncType) &&
Douglas Gregorc8376562009-03-06 22:43:54 +00001175 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) {
Douglas Gregor68719812009-02-16 18:20:44 +00001176 // The old declaration provided a function prototype, but the
1177 // new declaration does not. Merge in the prototype.
Sebastian Redl465226e2009-05-27 22:11:52 +00001178 assert(!OldProto->hasExceptionSpec() && "Exception spec in C");
Douglas Gregor68719812009-02-16 18:20:44 +00001179 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(),
1180 OldProto->arg_type_end());
1181 NewQType = Context.getFunctionType(NewFuncType->getResultType(),
Jay Foadbeaaccd2009-05-21 09:52:38 +00001182 ParamTypes.data(), ParamTypes.size(),
Douglas Gregor68719812009-02-16 18:20:44 +00001183 OldProto->isVariadic(),
Douglas Gregorce056bc2010-02-21 22:15:06 +00001184 OldProto->getTypeQuals(),
1185 false, false, 0, 0,
Rafael Espindola264ba482010-03-30 20:24:48 +00001186 OldProto->getExtInfo());
Douglas Gregor68719812009-02-16 18:20:44 +00001187 New->setType(NewQType);
Anders Carlssona75e8532009-05-14 21:46:00 +00001188 New->setHasInheritedPrototype();
Douglas Gregor450da982009-02-16 20:58:07 +00001189
1190 // Synthesize a parameter for each argument type.
1191 llvm::SmallVector<ParmVarDecl*, 16> Params;
Mike Stump1eb44332009-09-09 15:08:12 +00001192 for (FunctionProtoType::arg_type_iterator
1193 ParamType = OldProto->arg_type_begin(),
Douglas Gregor450da982009-02-16 20:58:07 +00001194 ParamEnd = OldProto->arg_type_end();
1195 ParamType != ParamEnd; ++ParamType) {
1196 ParmVarDecl *Param = ParmVarDecl::Create(Context, New,
1197 SourceLocation(), 0,
John McCalla93c9342009-12-07 02:54:59 +00001198 *ParamType, /*TInfo=*/0,
Douglas Gregor16573fa2010-04-19 22:54:31 +00001199 VarDecl::None, VarDecl::None,
1200 0);
Douglas Gregor450da982009-02-16 20:58:07 +00001201 Param->setImplicit();
1202 Params.push_back(Param);
1203 }
1204
Douglas Gregor838db382010-02-11 01:19:42 +00001205 New->setParams(Params.data(), Params.size());
Mike Stump1eb44332009-09-09 15:08:12 +00001206 }
Douglas Gregor68719812009-02-16 18:20:44 +00001207
Douglas Gregor04495c82009-02-24 01:23:02 +00001208 return MergeCompatibleFunctionDecls(New, Old);
Chris Lattner04421082008-04-08 04:40:51 +00001209 }
Chris Lattnere3995fe2007-11-06 06:07:26 +00001210
Douglas Gregorc8376562009-03-06 22:43:54 +00001211 // GNU C permits a K&R definition to follow a prototype declaration
1212 // if the declared types of the parameters in the K&R definition
1213 // match the types in the prototype declaration, even when the
1214 // promoted types of the parameters from the K&R definition differ
1215 // from the types in the prototype. GCC then keeps the types from
1216 // the prototype.
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00001217 //
1218 // If a variadic prototype is followed by a non-variadic K&R definition,
1219 // the K&R definition becomes variadic. This is sort of an edge case, but
1220 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and
1221 // C99 6.9.1p8.
Douglas Gregorc8376562009-03-06 22:43:54 +00001222 if (!getLangOptions().CPlusPlus &&
Douglas Gregorc8376562009-03-06 22:43:54 +00001223 Old->hasPrototype() && !New->hasPrototype() &&
John McCall183700f2009-09-21 23:43:11 +00001224 New->getType()->getAs<FunctionProtoType>() &&
Douglas Gregorc8376562009-03-06 22:43:54 +00001225 Old->getNumParams() == New->getNumParams()) {
1226 llvm::SmallVector<QualType, 16> ArgTypes;
1227 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings;
Mike Stump1eb44332009-09-09 15:08:12 +00001228 const FunctionProtoType *OldProto
John McCall183700f2009-09-21 23:43:11 +00001229 = Old->getType()->getAs<FunctionProtoType>();
Mike Stump1eb44332009-09-09 15:08:12 +00001230 const FunctionProtoType *NewProto
John McCall183700f2009-09-21 23:43:11 +00001231 = New->getType()->getAs<FunctionProtoType>();
Mike Stump1eb44332009-09-09 15:08:12 +00001232
Douglas Gregorc8376562009-03-06 22:43:54 +00001233 // Determine whether this is the GNU C extension.
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00001234 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(),
1235 NewProto->getResultType());
1236 bool LooseCompatible = !MergedReturn.isNull();
Mike Stump1eb44332009-09-09 15:08:12 +00001237 for (unsigned Idx = 0, End = Old->getNumParams();
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00001238 LooseCompatible && Idx != End; ++Idx) {
Douglas Gregorc8376562009-03-06 22:43:54 +00001239 ParmVarDecl *OldParm = Old->getParamDecl(Idx);
1240 ParmVarDecl *NewParm = New->getParamDecl(Idx);
Mike Stump1eb44332009-09-09 15:08:12 +00001241 if (Context.typesAreCompatible(OldParm->getType(),
Douglas Gregorc8376562009-03-06 22:43:54 +00001242 NewProto->getArgType(Idx))) {
1243 ArgTypes.push_back(NewParm->getType());
1244 } else if (Context.typesAreCompatible(OldParm->getType(),
1245 NewParm->getType())) {
Mike Stump1eb44332009-09-09 15:08:12 +00001246 GNUCompatibleParamWarning Warn
Douglas Gregorc8376562009-03-06 22:43:54 +00001247 = { OldParm, NewParm, NewProto->getArgType(Idx) };
1248 Warnings.push_back(Warn);
1249 ArgTypes.push_back(NewParm->getType());
1250 } else
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00001251 LooseCompatible = false;
Douglas Gregorc8376562009-03-06 22:43:54 +00001252 }
1253
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00001254 if (LooseCompatible) {
Douglas Gregorc8376562009-03-06 22:43:54 +00001255 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) {
1256 Diag(Warnings[Warn].NewParm->getLocation(),
1257 diag::ext_param_promoted_not_compatible_with_prototype)
1258 << Warnings[Warn].PromotedType
1259 << Warnings[Warn].OldParm->getType();
Mike Stump1eb44332009-09-09 15:08:12 +00001260 Diag(Warnings[Warn].OldParm->getLocation(),
Douglas Gregorc8376562009-03-06 22:43:54 +00001261 diag::note_previous_declaration);
1262 }
1263
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00001264 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0],
1265 ArgTypes.size(),
Douglas Gregorce056bc2010-02-21 22:15:06 +00001266 OldProto->isVariadic(), 0,
1267 false, false, 0, 0,
Rafael Espindola264ba482010-03-30 20:24:48 +00001268 OldProto->getExtInfo()));
Douglas Gregorc8376562009-03-06 22:43:54 +00001269 return MergeCompatibleFunctionDecls(New, Old);
1270 }
1271
1272 // Fall through to diagnose conflicting types.
1273 }
1274
Steve Naroff837618c2008-01-16 15:01:34 +00001275 // A function that has already been declared has been redeclared or defined
1276 // with a different type- show appropriate diagnostic
Douglas Gregor7814e6d2009-09-12 00:22:50 +00001277 if (unsigned BuiltinID = Old->getBuiltinID()) {
Douglas Gregorcda9c672009-02-16 17:45:42 +00001278 // The user has declared a builtin function with an incompatible
1279 // signature.
1280 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) {
1281 // The function the user is redeclaring is a library-defined
1282 // function like 'malloc' or 'printf'. Warn about the
Douglas Gregor374e1562009-03-23 17:47:24 +00001283 // redeclaration, then pretend that we don't know about this
1284 // library built-in.
Douglas Gregorcda9c672009-02-16 17:45:42 +00001285 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New;
1286 Diag(Old->getLocation(), diag::note_previous_builtin_declaration)
1287 << Old << Old->getType();
Douglas Gregor374e1562009-03-23 17:47:24 +00001288 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin);
1289 Old->setInvalidDecl();
1290 return false;
Douglas Gregorcda9c672009-02-16 17:45:42 +00001291 }
Steve Naroff837618c2008-01-16 15:01:34 +00001292
Douglas Gregorcda9c672009-02-16 17:45:42 +00001293 PrevDiag = diag::note_previous_builtin_declaration;
1294 }
1295
Chris Lattnerd9d22dd2008-11-24 05:29:24 +00001296 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName();
Douglas Gregor3e41d602009-02-13 23:20:09 +00001297 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
Douglas Gregorcda9c672009-02-16 17:45:42 +00001298 return true;
Reid Spencer5f016e22007-07-11 17:01:13 +00001299}
1300
Douglas Gregor04495c82009-02-24 01:23:02 +00001301/// \brief Completes the merge of two function declarations that are
Mike Stump1eb44332009-09-09 15:08:12 +00001302/// known to be compatible.
Douglas Gregor04495c82009-02-24 01:23:02 +00001303///
1304/// This routine handles the merging of attributes and other
1305/// properties of function declarations form the old declaration to
1306/// the new declaration, once we know that New is in fact a
1307/// redeclaration of Old.
1308///
1309/// \returns false
1310bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) {
1311 // Merge the attributes
Chris Lattnercc581472009-03-04 06:05:19 +00001312 MergeAttributes(New, Old, Context);
Douglas Gregor04495c82009-02-24 01:23:02 +00001313
1314 // Merge the storage class.
Douglas Gregor1fc09a92009-09-13 07:46:26 +00001315 if (Old->getStorageClass() != FunctionDecl::Extern &&
1316 Old->getStorageClass() != FunctionDecl::None)
Douglas Gregor9f9bf252009-04-28 06:37:30 +00001317 New->setStorageClass(Old->getStorageClass());
Douglas Gregor04495c82009-02-24 01:23:02 +00001318
Douglas Gregor04495c82009-02-24 01:23:02 +00001319 // Merge "pure" flag.
1320 if (Old->isPure())
1321 New->setPure();
1322
1323 // Merge the "deleted" flag.
1324 if (Old->isDeleted())
1325 New->setDeleted();
Mike Stump1eb44332009-09-09 15:08:12 +00001326
Douglas Gregor04495c82009-02-24 01:23:02 +00001327 if (getLangOptions().CPlusPlus)
1328 return MergeCXXFunctionDecl(New, Old);
1329
1330 return false;
1331}
1332
Reid Spencer5f016e22007-07-11 17:01:13 +00001333/// MergeVarDecl - We just parsed a variable 'New' which has the same name
1334/// and scope as a previous declaration 'Old'. Figure out how to resolve this
1335/// situation, merging decls or emitting diagnostics as appropriate.
1336///
Mike Stump1eb44332009-09-09 15:08:12 +00001337/// Tentative definition rules (C99 6.9.2p2) are checked by
1338/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative
Steve Naroffff9eb1f2008-08-08 17:50:35 +00001339/// definitions here, since the initializer hasn't been attached.
Mike Stump1eb44332009-09-09 15:08:12 +00001340///
John McCall68263142009-11-18 22:49:29 +00001341void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) {
1342 // If the new decl is already invalid, don't do any other checking.
1343 if (New->isInvalidDecl())
1344 return;
Mike Stump1eb44332009-09-09 15:08:12 +00001345
Reid Spencer5f016e22007-07-11 17:01:13 +00001346 // Verify the old decl was also a variable.
John McCall68263142009-11-18 22:49:29 +00001347 VarDecl *Old = 0;
1348 if (!Previous.isSingleResult() ||
1349 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) {
Chris Lattnerf3a41af2008-11-20 06:38:18 +00001350 Diag(New->getLocation(), diag::err_redefinition_different_kind)
Chris Lattner08631c52008-11-23 21:45:46 +00001351 << New->getDeclName();
John McCall68263142009-11-18 22:49:29 +00001352 Diag(Previous.getRepresentativeDecl()->getLocation(),
1353 diag::note_previous_definition);
Chris Lattnereaaebc72009-04-25 08:06:05 +00001354 return New->setInvalidDecl();
Reid Spencer5f016e22007-07-11 17:01:13 +00001355 }
Chris Lattnerddee4232008-03-03 03:28:21 +00001356
Chris Lattnercc581472009-03-04 06:05:19 +00001357 MergeAttributes(New, Old, Context);
Chris Lattnerddee4232008-03-03 03:28:21 +00001358
Eli Friedman13ca96a2009-01-24 23:49:55 +00001359 // Merge the types
Eli Friedman88d936b2009-05-16 13:54:38 +00001360 QualType MergedT;
1361 if (getLangOptions().CPlusPlus) {
1362 if (Context.hasSameType(New->getType(), Old->getType()))
1363 MergedT = New->getType();
Eli Friedman153c33e2009-12-10 08:54:47 +00001364 // C++ [basic.link]p10:
1365 // [...] the types specified by all declarations referring to a given
1366 // object or function shall be identical, except that declarations for an
1367 // array object can specify array types that differ by the presence or
1368 // absence of a major array bound (8.3.4).
Mike Stump1eb44332009-09-09 15:08:12 +00001369 else if (Old->getType()->isIncompleteArrayType() &&
Douglas Gregor8dfb7ec2009-09-09 06:04:29 +00001370 New->getType()->isArrayType()) {
Mike Stump1eb44332009-09-09 15:08:12 +00001371 CanQual<ArrayType> OldArray
Douglas Gregor8dfb7ec2009-09-09 06:04:29 +00001372 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>();
Mike Stump1eb44332009-09-09 15:08:12 +00001373 CanQual<ArrayType> NewArray
Douglas Gregor8dfb7ec2009-09-09 06:04:29 +00001374 = Context.getCanonicalType(New->getType())->getAs<ArrayType>();
1375 if (OldArray->getElementType() == NewArray->getElementType())
1376 MergedT = New->getType();
Eli Friedman153c33e2009-12-10 08:54:47 +00001377 } else if (Old->getType()->isArrayType() &&
1378 New->getType()->isIncompleteArrayType()) {
1379 CanQual<ArrayType> OldArray
1380 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>();
1381 CanQual<ArrayType> NewArray
1382 = Context.getCanonicalType(New->getType())->getAs<ArrayType>();
1383 if (OldArray->getElementType() == NewArray->getElementType())
1384 MergedT = Old->getType();
Fariborz Jahanian2390a722010-05-19 21:37:30 +00001385 } else if (New->getType()->isObjCObjectPointerType()
1386 && Old->getType()->isObjCObjectPointerType()) {
1387 MergedT = Context.mergeObjCGCQualifiers(New->getType(), Old->getType());
Douglas Gregor8dfb7ec2009-09-09 06:04:29 +00001388 }
Eli Friedman88d936b2009-05-16 13:54:38 +00001389 } else {
1390 MergedT = Context.mergeTypes(New->getType(), Old->getType());
1391 }
Eli Friedman13ca96a2009-01-24 23:49:55 +00001392 if (MergedT.isNull()) {
Mike Stump1eb44332009-09-09 15:08:12 +00001393 Diag(New->getLocation(), diag::err_redefinition_different_type)
Douglas Gregor6037fcb2009-01-09 19:42:16 +00001394 << New->getDeclName();
Chris Lattner5f4a6822008-11-23 23:12:31 +00001395 Diag(Old->getLocation(), diag::note_previous_definition);
Chris Lattnereaaebc72009-04-25 08:06:05 +00001396 return New->setInvalidDecl();
Reid Spencer5f016e22007-07-11 17:01:13 +00001397 }
Eli Friedman13ca96a2009-01-24 23:49:55 +00001398 New->setType(MergedT);
Douglas Gregor656de632009-03-11 23:52:16 +00001399
Steve Naroffb7b032e2008-01-30 00:44:01 +00001400 // C99 6.2.2p4: Check if we have a static decl followed by a non-static.
1401 if (New->getStorageClass() == VarDecl::Static &&
Daniel Dunbar5466c7b2009-04-14 02:25:56 +00001402 (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) {
Chris Lattnerd9d22dd2008-11-24 05:29:24 +00001403 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName();
Chris Lattner5f4a6822008-11-23 23:12:31 +00001404 Diag(Old->getLocation(), diag::note_previous_definition);
Chris Lattnereaaebc72009-04-25 08:06:05 +00001405 return New->setInvalidDecl();
Steve Naroffb7b032e2008-01-30 00:44:01 +00001406 }
Mike Stump1eb44332009-09-09 15:08:12 +00001407 // C99 6.2.2p4:
Douglas Gregor5ef122e2009-03-19 22:01:50 +00001408 // For an identifier declared with the storage-class specifier
1409 // extern in a scope in which a prior declaration of that
1410 // identifier is visible,23) if the prior declaration specifies
1411 // internal or external linkage, the linkage of the identifier at
1412 // the later declaration is the same as the linkage specified at
1413 // the prior declaration. If no prior declaration is visible, or
1414 // if the prior declaration specifies no linkage, then the
1415 // identifier has external linkage.
Douglas Gregor38179b22009-03-23 16:17:01 +00001416 if (New->hasExternalStorage() && Old->hasLinkage())
Douglas Gregor5ef122e2009-03-19 22:01:50 +00001417 /* Okay */;
1418 else if (New->getStorageClass() != VarDecl::Static &&
1419 Old->getStorageClass() == VarDecl::Static) {
Chris Lattnerd9d22dd2008-11-24 05:29:24 +00001420 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName();
Chris Lattner5f4a6822008-11-23 23:12:31 +00001421 Diag(Old->getLocation(), diag::note_previous_definition);
Chris Lattnereaaebc72009-04-25 08:06:05 +00001422 return New->setInvalidDecl();
Steve Naroffb7b032e2008-01-30 00:44:01 +00001423 }
Daniel Dunbar5466c7b2009-04-14 02:25:56 +00001424
Steve Naroff094cefb2008-09-17 14:05:40 +00001425 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup.
Mike Stump1eb44332009-09-09 15:08:12 +00001426
Daniel Dunbar5466c7b2009-04-14 02:25:56 +00001427 // FIXME: The test for external storage here seems wrong? We still
1428 // need to check for mismatches.
1429 if (!New->hasExternalStorage() && !New->isFileVarDecl() &&
Douglas Gregor656de632009-03-11 23:52:16 +00001430 // Don't complain about out-of-line definitions of static members.
1431 !(Old->getLexicalDeclContext()->isRecord() &&
1432 !New->getLexicalDeclContext()->isRecord())) {
Chris Lattner08631c52008-11-23 21:45:46 +00001433 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName();
Chris Lattner5f4a6822008-11-23 23:12:31 +00001434 Diag(Old->getLocation(), diag::note_previous_definition);
Chris Lattnereaaebc72009-04-25 08:06:05 +00001435 return New->setInvalidDecl();
Reid Spencer5f016e22007-07-11 17:01:13 +00001436 }
Douglas Gregor275a3692009-03-10 23:43:53 +00001437
Eli Friedman63054b32009-04-19 20:27:55 +00001438 if (New->isThreadSpecified() && !Old->isThreadSpecified()) {
1439 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName();
1440 Diag(Old->getLocation(), diag::note_previous_definition);
1441 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) {
1442 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName();
1443 Diag(Old->getLocation(), diag::note_previous_definition);
1444 }
1445
Sebastian Redl4cae1b32010-02-02 18:35:11 +00001446 // C++ doesn't have tentative definitions, so go right ahead and check here.
1447 const VarDecl *Def;
Sebastian Redl6c048a92010-02-03 02:08:48 +00001448 if (getLangOptions().CPlusPlus &&
1449 New->isThisDeclarationADefinition() == VarDecl::Definition &&
Sebastian Redl4cae1b32010-02-02 18:35:11 +00001450 (Def = Old->getDefinition())) {
1451 Diag(New->getLocation(), diag::err_redefinition)
1452 << New->getDeclName();
1453 Diag(Def->getLocation(), diag::note_previous_definition);
1454 New->setInvalidDecl();
1455 return;
1456 }
1457
Fariborz Jahanian2bf6d7b2010-06-21 16:08:37 +00001458 if (New->hasExternalStorage() &&
1459 Old->getLinkage() == InternalLinkage)
1460 New->setStorageClass(Old->getStorageClass());
1461
Douglas Gregor275a3692009-03-10 23:43:53 +00001462 // Keep a chain of previous declarations.
1463 New->setPreviousDeclaration(Old);
John McCall46460a62010-01-20 21:53:11 +00001464
1465 // Inherit access appropriately.
1466 New->setAccess(Old->getAccess());
Reid Spencer5f016e22007-07-11 17:01:13 +00001467}
1468
1469/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with
1470/// no declarator (e.g. "struct foo;") is parsed.
John McCallaec03712010-05-21 20:45:30 +00001471Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS,
1472 DeclSpec &DS) {
Eli Friedmand2968362009-04-09 21:26:42 +00001473 // FIXME: Error on auto/register at file scope
1474 // FIXME: Error on inline/virtual/explicit
Eli Friedman63054b32009-04-19 20:27:55 +00001475 // FIXME: Warn on useless __thread
Eli Friedmand2968362009-04-09 21:26:42 +00001476 // FIXME: Warn on useless const/volatile
1477 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable
1478 // FIXME: Warn on useless attributes
John McCalle3af0232009-10-07 23:34:25 +00001479 Decl *TagD = 0;
Douglas Gregor1a51b4a2009-02-09 15:09:02 +00001480 TagDecl *Tag = 0;
1481 if (DS.getTypeSpecType() == DeclSpec::TST_class ||
1482 DS.getTypeSpecType() == DeclSpec::TST_struct ||
1483 DS.getTypeSpecType() == DeclSpec::TST_union ||
Douglas Gregor4d9a16f2009-05-12 23:25:50 +00001484 DS.getTypeSpecType() == DeclSpec::TST_enum) {
John McCalle3af0232009-10-07 23:34:25 +00001485 TagD = static_cast<Decl *>(DS.getTypeRep());
1486
1487 if (!TagD) // We probably had an error
Douglas Gregor4d9a16f2009-05-12 23:25:50 +00001488 return DeclPtrTy();
1489
John McCall67d1a672009-08-06 02:15:43 +00001490 // Note that the above type specs guarantee that the
1491 // type rep is a Decl, whereas in many of the others
1492 // it's a Type.
John McCalle3af0232009-10-07 23:34:25 +00001493 Tag = dyn_cast<TagDecl>(TagD);
Douglas Gregor4d9a16f2009-05-12 23:25:50 +00001494 }
Douglas Gregor1a51b4a2009-02-09 15:09:02 +00001495
Nuno Lopes0a8bab02009-12-17 11:35:26 +00001496 if (unsigned TypeQuals = DS.getTypeQualifiers()) {
1497 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object
1498 // or incomplete types shall not be restrict-qualified."
1499 if (TypeQuals & DeclSpec::TQ_restrict)
1500 Diag(DS.getRestrictSpecLoc(),
1501 diag::err_typecheck_invalid_restrict_not_pointer_noarg)
1502 << DS.getSourceRange();
1503 }
1504
Douglas Gregord85bea22009-09-26 06:47:28 +00001505 if (DS.isFriendSpecified()) {
John McCalle3af0232009-10-07 23:34:25 +00001506 // If we're dealing with a class template decl, assume that the
1507 // template routines are handling it.
1508 if (TagD && isa<ClassTemplateDecl>(TagD))
Douglas Gregord85bea22009-09-26 06:47:28 +00001509 return DeclPtrTy();
John McCalle3af0232009-10-07 23:34:25 +00001510 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0));
Douglas Gregord85bea22009-09-26 06:47:28 +00001511 }
1512
Douglas Gregor4920f1f2009-01-12 22:49:06 +00001513 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) {
Chris Lattnerd451f832009-10-25 22:21:57 +00001514 // If there are attributes in the DeclSpec, apply them to the record.
1515 if (const AttributeList *AL = DS.getAttributes())
1516 ProcessDeclAttributeList(S, Record, AL);
1517
Douglas Gregor4920f1f2009-01-12 22:49:06 +00001518 if (!Record->getDeclName() && Record->isDefinition() &&
Douglas Gregora71c1292009-03-06 23:06:59 +00001519 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) {
1520 if (getLangOptions().CPlusPlus ||
1521 Record->getDeclContext()->isRecord())
John McCallaec03712010-05-21 20:45:30 +00001522 return BuildAnonymousStructOrUnion(S, DS, AS, Record);
Douglas Gregora71c1292009-03-06 23:06:59 +00001523
Douglas Gregorcb821d02010-04-08 21:33:23 +00001524 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators)
Douglas Gregora71c1292009-03-06 23:06:59 +00001525 << DS.getSourceRange();
1526 }
Douglas Gregor4920f1f2009-01-12 22:49:06 +00001527
1528 // Microsoft allows unnamed struct/union fields. Don't complain
1529 // about them.
1530 // FIXME: Should we support Microsoft's extensions in this area?
1531 if (Record->getDeclName() && getLangOptions().Microsoft)
Chris Lattnerb28317a2009-03-28 19:18:32 +00001532 return DeclPtrTy::make(Tag);
Douglas Gregor4920f1f2009-01-12 22:49:06 +00001533 }
Douglas Gregord85bea22009-09-26 06:47:28 +00001534
Mike Stump1eb44332009-09-09 15:08:12 +00001535 if (!DS.isMissingDeclaratorOk() &&
Douglas Gregorddc29e12009-02-06 22:42:48 +00001536 DS.getTypeSpecType() != DeclSpec::TST_error) {
Douglas Gregor21282df2009-01-22 16:23:54 +00001537 // Warn about typedefs of enums without names, since this is an
1538 // extension in both Microsoft an GNU.
Douglas Gregor8158f692009-01-17 02:55:50 +00001539 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef &&
1540 Tag && isa<EnumDecl>(Tag)) {
Douglas Gregor21282df2009-01-22 16:23:54 +00001541 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name)
Douglas Gregoree159c12009-01-13 23:10:51 +00001542 << DS.getSourceRange();
Chris Lattnerb28317a2009-03-28 19:18:32 +00001543 return DeclPtrTy::make(Tag);
Douglas Gregoree159c12009-01-13 23:10:51 +00001544 }
1545
Douglas Gregorcb821d02010-04-08 21:33:23 +00001546 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators)
Sebastian Redla4ed0d82008-12-28 15:28:59 +00001547 << DS.getSourceRange();
Sebastian Redla4ed0d82008-12-28 15:28:59 +00001548 }
Mike Stump1eb44332009-09-09 15:08:12 +00001549
Chris Lattnerb28317a2009-03-28 19:18:32 +00001550 return DeclPtrTy::make(Tag);
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001551}
1552
John McCall1d7c5282009-12-18 10:40:03 +00001553/// We are trying to inject an anonymous member into the given scope;
John McCall68263142009-11-18 22:49:29 +00001554/// check if there's an existing declaration that can't be overloaded.
1555///
1556/// \return true if this is a forbidden redeclaration
John McCall1d7c5282009-12-18 10:40:03 +00001557static bool CheckAnonMemberRedeclaration(Sema &SemaRef,
1558 Scope *S,
Fariborz Jahanian588a4ad2010-01-22 18:30:17 +00001559 DeclContext *Owner,
John McCall1d7c5282009-12-18 10:40:03 +00001560 DeclarationName Name,
1561 SourceLocation NameLoc,
1562 unsigned diagnostic) {
1563 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName,
1564 Sema::ForRedeclaration);
1565 if (!SemaRef.LookupName(R, S)) return false;
John McCall68263142009-11-18 22:49:29 +00001566
John McCall1d7c5282009-12-18 10:40:03 +00001567 if (R.getAsSingle<TagDecl>())
John McCall68263142009-11-18 22:49:29 +00001568 return false;
1569
1570 // Pick a representative declaration.
John McCall1d7c5282009-12-18 10:40:03 +00001571 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl();
Fariborz Jahanian588a4ad2010-01-22 18:30:17 +00001572 if (PrevDecl && Owner->isRecord()) {
1573 RecordDecl *Record = cast<RecordDecl>(Owner);
1574 if (!SemaRef.isDeclInScope(PrevDecl, Record, S))
1575 return false;
1576 }
John McCall68263142009-11-18 22:49:29 +00001577
John McCall1d7c5282009-12-18 10:40:03 +00001578 SemaRef.Diag(NameLoc, diagnostic) << Name;
1579 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
John McCall68263142009-11-18 22:49:29 +00001580
1581 return true;
1582}
1583
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001584/// InjectAnonymousStructOrUnionMembers - Inject the members of the
1585/// anonymous struct or union AnonRecord into the owning context Owner
1586/// and scope S. This routine will be invoked just after we realize
1587/// that an unnamed union or struct is actually an anonymous union or
1588/// struct, e.g.,
1589///
1590/// @code
1591/// union {
1592/// int i;
1593/// float f;
1594/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and
1595/// // f into the surrounding scope.x
1596/// @endcode
1597///
1598/// This routine is recursive, injecting the names of nested anonymous
1599/// structs/unions into the owning context and scope as well.
John McCallaec03712010-05-21 20:45:30 +00001600static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S,
1601 DeclContext *Owner,
1602 RecordDecl *AnonRecord,
1603 AccessSpecifier AS) {
John McCall68263142009-11-18 22:49:29 +00001604 unsigned diagKind
1605 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl
1606 : diag::err_anonymous_struct_member_redecl;
1607
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001608 bool Invalid = false;
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00001609 for (RecordDecl::field_iterator F = AnonRecord->field_begin(),
1610 FEnd = AnonRecord->field_end();
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001611 F != FEnd; ++F) {
1612 if ((*F)->getDeclName()) {
John McCallaec03712010-05-21 20:45:30 +00001613 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, (*F)->getDeclName(),
John McCall1d7c5282009-12-18 10:40:03 +00001614 (*F)->getLocation(), diagKind)) {
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001615 // C++ [class.union]p2:
1616 // The names of the members of an anonymous union shall be
1617 // distinct from the names of any other entity in the
1618 // scope in which the anonymous union is declared.
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001619 Invalid = true;
1620 } else {
1621 // C++ [class.union]p2:
1622 // For the purpose of name lookup, after the anonymous union
1623 // definition, the members of the anonymous union are
1624 // considered to have been defined in the scope in which the
1625 // anonymous union is declared.
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00001626 Owner->makeDeclVisibleInContext(*F);
John McCallaec03712010-05-21 20:45:30 +00001627 S->AddDecl(Sema::DeclPtrTy::make(*F));
1628 SemaRef.IdResolver.AddDecl(*F);
1629
1630 // That includes picking up the appropriate access specifier.
1631 if (AS != AS_none) (*F)->setAccess(AS);
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001632 }
1633 } else if (const RecordType *InnerRecordType
Ted Kremenek6217b802009-07-29 21:53:49 +00001634 = (*F)->getType()->getAs<RecordType>()) {
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001635 RecordDecl *InnerRecord = InnerRecordType->getDecl();
1636 if (InnerRecord->isAnonymousStructOrUnion())
Mike Stump1eb44332009-09-09 15:08:12 +00001637 Invalid = Invalid ||
John McCallaec03712010-05-21 20:45:30 +00001638 InjectAnonymousStructOrUnionMembers(SemaRef, S, Owner,
1639 InnerRecord, AS);
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001640 }
1641 }
1642
1643 return Invalid;
1644}
1645
Douglas Gregor16573fa2010-04-19 22:54:31 +00001646/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to
1647/// a VarDecl::StorageClass. Any error reporting is up to the caller:
1648/// illegal input values are mapped to VarDecl::None.
Abramo Bagnarab21b4052010-04-28 13:11:54 +00001649/// If the input declaration context is a linkage specification
1650/// with no braces, then Extern is mapped to None.
Douglas Gregor16573fa2010-04-19 22:54:31 +00001651static VarDecl::StorageClass
Abramo Bagnarab21b4052010-04-28 13:11:54 +00001652StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec,
1653 DeclContext *DC) {
Douglas Gregor16573fa2010-04-19 22:54:31 +00001654 switch (StorageClassSpec) {
1655 case DeclSpec::SCS_unspecified: return VarDecl::None;
Abramo Bagnarab21b4052010-04-28 13:11:54 +00001656 case DeclSpec::SCS_extern:
1657 // If the current context is a C++ linkage specification
1658 // having no braces, then the keyword "extern" is properly part
1659 // of the linkage specification itself, rather than being
1660 // the written storage class specifier.
1661 return (DC && isa<LinkageSpecDecl>(DC) &&
1662 !cast<LinkageSpecDecl>(DC)->hasBraces())
1663 ? VarDecl::None : VarDecl::Extern;
Douglas Gregor16573fa2010-04-19 22:54:31 +00001664 case DeclSpec::SCS_static: return VarDecl::Static;
1665 case DeclSpec::SCS_auto: return VarDecl::Auto;
1666 case DeclSpec::SCS_register: return VarDecl::Register;
1667 case DeclSpec::SCS_private_extern: return VarDecl::PrivateExtern;
1668 // Illegal SCSs map to None: error reporting is up to the caller.
1669 case DeclSpec::SCS_mutable: // Fall through.
1670 case DeclSpec::SCS_typedef: return VarDecl::None;
1671 }
1672 llvm_unreachable("unknown storage class specifier");
1673}
1674
1675/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to
1676/// a FunctionDecl::StorageClass. Any error reporting is up to the caller:
1677/// illegal input values are mapped to FunctionDecl::None.
Abramo Bagnarab21b4052010-04-28 13:11:54 +00001678/// If the input declaration context is a linkage specification
1679/// with no braces, then Extern is mapped to None.
Douglas Gregor16573fa2010-04-19 22:54:31 +00001680static FunctionDecl::StorageClass
Abramo Bagnarab21b4052010-04-28 13:11:54 +00001681StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec,
1682 DeclContext *DC) {
Douglas Gregor16573fa2010-04-19 22:54:31 +00001683 switch (StorageClassSpec) {
1684 case DeclSpec::SCS_unspecified: return FunctionDecl::None;
Abramo Bagnarab21b4052010-04-28 13:11:54 +00001685 case DeclSpec::SCS_extern:
1686 // If the current context is a C++ linkage specification
1687 // having no braces, then the keyword "extern" is properly part
1688 // of the linkage specification itself, rather than being
1689 // the written storage class specifier.
1690 return (DC && isa<LinkageSpecDecl>(DC) &&
1691 !cast<LinkageSpecDecl>(DC)->hasBraces())
1692 ? FunctionDecl::None : FunctionDecl::Extern;
Douglas Gregor16573fa2010-04-19 22:54:31 +00001693 case DeclSpec::SCS_static: return FunctionDecl::Static;
1694 case DeclSpec::SCS_private_extern: return FunctionDecl::PrivateExtern;
1695 // Illegal SCSs map to None: error reporting is up to the caller.
1696 case DeclSpec::SCS_auto: // Fall through.
1697 case DeclSpec::SCS_mutable: // Fall through.
1698 case DeclSpec::SCS_register: // Fall through.
1699 case DeclSpec::SCS_typedef: return FunctionDecl::None;
1700 }
1701 llvm_unreachable("unknown storage class specifier");
1702}
1703
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001704/// ActOnAnonymousStructOrUnion - Handle the declaration of an
1705/// anonymous structure or union. Anonymous unions are a C++ feature
1706/// (C++ [class.union]) and a GNU C extension; anonymous structures
Mike Stump1eb44332009-09-09 15:08:12 +00001707/// are a GNU C and GNU C++ extension.
Chris Lattnerb28317a2009-03-28 19:18:32 +00001708Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS,
John McCallaec03712010-05-21 20:45:30 +00001709 AccessSpecifier AS,
Chris Lattnerb28317a2009-03-28 19:18:32 +00001710 RecordDecl *Record) {
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001711 DeclContext *Owner = Record->getDeclContext();
1712
1713 // Diagnose whether this anonymous struct/union is an extension.
1714 if (Record->isUnion() && !getLangOptions().CPlusPlus)
1715 Diag(Record->getLocation(), diag::ext_anonymous_union);
1716 else if (!Record->isUnion())
1717 Diag(Record->getLocation(), diag::ext_anonymous_struct);
Mike Stump1eb44332009-09-09 15:08:12 +00001718
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001719 // C and C++ require different kinds of checks for anonymous
1720 // structs/unions.
1721 bool Invalid = false;
1722 if (getLangOptions().CPlusPlus) {
1723 const char* PrevSpec = 0;
John McCallfec54012009-08-03 20:12:06 +00001724 unsigned DiagID;
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001725 // C++ [class.union]p3:
1726 // Anonymous unions declared in a named namespace or in the
1727 // global namespace shall be declared static.
1728 if (DS.getStorageClassSpec() != DeclSpec::SCS_static &&
1729 (isa<TranslationUnitDecl>(Owner) ||
Mike Stump1eb44332009-09-09 15:08:12 +00001730 (isa<NamespaceDecl>(Owner) &&
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001731 cast<NamespaceDecl>(Owner)->getDeclName()))) {
1732 Diag(Record->getLocation(), diag::err_anonymous_union_not_static);
1733 Invalid = true;
1734
1735 // Recover by adding 'static'.
John McCallfec54012009-08-03 20:12:06 +00001736 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(),
1737 PrevSpec, DiagID);
Mike Stump1eb44332009-09-09 15:08:12 +00001738 }
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001739 // C++ [class.union]p3:
1740 // A storage class is not allowed in a declaration of an
1741 // anonymous union in a class scope.
1742 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified &&
1743 isa<RecordDecl>(Owner)) {
Mike Stump1eb44332009-09-09 15:08:12 +00001744 Diag(DS.getStorageClassSpecLoc(),
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001745 diag::err_anonymous_union_with_storage_spec);
1746 Invalid = true;
1747
1748 // Recover by removing the storage specifier.
1749 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(),
John McCallfec54012009-08-03 20:12:06 +00001750 PrevSpec, DiagID);
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001751 }
Douglas Gregor6b3945f2009-01-07 19:46:03 +00001752
Mike Stump1eb44332009-09-09 15:08:12 +00001753 // C++ [class.union]p2:
Douglas Gregor6b3945f2009-01-07 19:46:03 +00001754 // The member-specification of an anonymous union shall only
1755 // define non-static data members. [Note: nested types and
1756 // functions cannot be declared within an anonymous union. ]
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00001757 for (DeclContext::decl_iterator Mem = Record->decls_begin(),
1758 MemEnd = Record->decls_end();
Douglas Gregor6b3945f2009-01-07 19:46:03 +00001759 Mem != MemEnd; ++Mem) {
1760 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) {
1761 // C++ [class.union]p3:
1762 // An anonymous union shall not have private or protected
1763 // members (clause 11).
John McCallaec03712010-05-21 20:45:30 +00001764 assert(FD->getAccess() != AS_none);
1765 if (FD->getAccess() != AS_public) {
Douglas Gregor6b3945f2009-01-07 19:46:03 +00001766 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member)
1767 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected);
1768 Invalid = true;
1769 }
1770 } else if ((*Mem)->isImplicit()) {
1771 // Any implicit members are fine.
Douglas Gregor1931b442009-02-03 00:34:39 +00001772 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) {
1773 // This is a type that showed up in an
1774 // elaborated-type-specifier inside the anonymous struct or
1775 // union, but which actually declares a type outside of the
1776 // anonymous struct or union. It's okay.
Douglas Gregor6b3945f2009-01-07 19:46:03 +00001777 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) {
1778 if (!MemRecord->isAnonymousStructOrUnion() &&
1779 MemRecord->getDeclName()) {
1780 // This is a nested type declaration.
1781 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type)
1782 << (int)Record->isUnion();
1783 Invalid = true;
1784 }
Abramo Bagnara6206d532010-06-05 05:09:32 +00001785 } else if (isa<AccessSpecDecl>(*Mem)) {
1786 // Any access specifier is fine.
Douglas Gregor6b3945f2009-01-07 19:46:03 +00001787 } else {
1788 // We have something that isn't a non-static data
1789 // member. Complain about it.
1790 unsigned DK = diag::err_anonymous_record_bad_member;
1791 if (isa<TypeDecl>(*Mem))
1792 DK = diag::err_anonymous_record_with_type;
1793 else if (isa<FunctionDecl>(*Mem))
1794 DK = diag::err_anonymous_record_with_function;
1795 else if (isa<VarDecl>(*Mem))
1796 DK = diag::err_anonymous_record_with_static;
1797 Diag((*Mem)->getLocation(), DK)
1798 << (int)Record->isUnion();
1799 Invalid = true;
1800 }
1801 }
Mike Stump1eb44332009-09-09 15:08:12 +00001802 }
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001803
1804 if (!Record->isUnion() && !Owner->isRecord()) {
Douglas Gregor4920f1f2009-01-12 22:49:06 +00001805 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member)
1806 << (int)getLangOptions().CPlusPlus;
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001807 Invalid = true;
1808 }
1809
John McCalleb692e02009-10-22 23:31:08 +00001810 // Mock up a declarator.
1811 Declarator Dc(DS, Declarator::TypeNameContext);
John McCallbf1a0282010-06-04 23:28:52 +00001812 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S);
John McCalla93c9342009-12-07 02:54:59 +00001813 assert(TInfo && "couldn't build declarator info for anonymous struct/union");
John McCalleb692e02009-10-22 23:31:08 +00001814
Mike Stump1eb44332009-09-09 15:08:12 +00001815 // Create a declaration for this anonymous struct/union.
Douglas Gregor4afa39d2009-01-20 01:17:11 +00001816 NamedDecl *Anon = 0;
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001817 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) {
1818 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(),
Mike Stump1eb44332009-09-09 15:08:12 +00001819 /*IdentifierInfo=*/0,
Argyrios Kyrtzidisa5d82002009-08-21 00:31:54 +00001820 Context.getTypeDeclType(Record),
John McCalla93c9342009-12-07 02:54:59 +00001821 TInfo,
Argyrios Kyrtzidisa5d82002009-08-21 00:31:54 +00001822 /*BitWidth=*/0, /*Mutable=*/false);
John McCallaec03712010-05-21 20:45:30 +00001823 Anon->setAccess(AS);
Douglas Gregorfe60f842010-05-03 15:18:25 +00001824 if (getLangOptions().CPlusPlus) {
Douglas Gregor6b3945f2009-01-07 19:46:03 +00001825 FieldCollector->Add(cast<FieldDecl>(Anon));
Douglas Gregorfe60f842010-05-03 15:18:25 +00001826 if (!cast<CXXRecordDecl>(Record)->isEmpty())
1827 cast<CXXRecordDecl>(OwningClass)->setEmpty(false);
1828 }
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001829 } else {
Douglas Gregor16573fa2010-04-19 22:54:31 +00001830 DeclSpec::SCS SCSpec = DS.getStorageClassSpec();
1831 assert(SCSpec != DeclSpec::SCS_typedef &&
1832 "Parser allowed 'typedef' as storage class VarDecl.");
Abramo Bagnarab21b4052010-04-28 13:11:54 +00001833 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec, 0);
Douglas Gregor16573fa2010-04-19 22:54:31 +00001834 if (SCSpec == DeclSpec::SCS_mutable) {
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001835 // mutable can only appear on non-static class members, so it's always
1836 // an error here
1837 Diag(Record->getLocation(), diag::err_mutable_nonmember);
1838 Invalid = true;
1839 SC = VarDecl::None;
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001840 }
Douglas Gregor16573fa2010-04-19 22:54:31 +00001841 SCSpec = DS.getStorageClassSpecAsWritten();
1842 VarDecl::StorageClass SCAsWritten
Abramo Bagnarab21b4052010-04-28 13:11:54 +00001843 = StorageClassSpecToVarDeclStorageClass(SCSpec, 0);
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001844
1845 Anon = VarDecl::Create(Context, Owner, Record->getLocation(),
Mike Stump1eb44332009-09-09 15:08:12 +00001846 /*IdentifierInfo=*/0,
Argyrios Kyrtzidisa5d82002009-08-21 00:31:54 +00001847 Context.getTypeDeclType(Record),
Douglas Gregor16573fa2010-04-19 22:54:31 +00001848 TInfo, SC, SCAsWritten);
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001849 }
Douglas Gregor6b3945f2009-01-07 19:46:03 +00001850 Anon->setImplicit();
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001851
1852 // Add the anonymous struct/union object to the current
1853 // context. We'll be referencing this object when we refer to one of
1854 // its members.
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00001855 Owner->addDecl(Anon);
Douglas Gregorfe60f842010-05-03 15:18:25 +00001856
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001857 // Inject the members of the anonymous struct/union into the owning
1858 // context and into the identifier resolver chain for name lookup
1859 // purposes.
John McCallaec03712010-05-21 20:45:30 +00001860 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS))
Douglas Gregor4920f1f2009-01-12 22:49:06 +00001861 Invalid = true;
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001862
1863 // Mark this as an anonymous struct/union type. Note that we do not
1864 // do this until after we have already checked and injected the
1865 // members of this anonymous struct/union type, because otherwise
1866 // the members could be injected twice: once by DeclContext when it
1867 // builds its lookup table, and once by
Mike Stump1eb44332009-09-09 15:08:12 +00001868 // InjectAnonymousStructOrUnionMembers.
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001869 Record->setAnonymousStructOrUnion(true);
1870
1871 if (Invalid)
1872 Anon->setInvalidDecl();
1873
Chris Lattnerb28317a2009-03-28 19:18:32 +00001874 return DeclPtrTy::make(Anon);
Reid Spencer5f016e22007-07-11 17:01:13 +00001875}
1876
Steve Narofff0090632007-09-02 02:04:30 +00001877
Douglas Gregor10bd3682008-11-17 22:58:34 +00001878/// GetNameForDeclarator - Determine the full declaration name for the
1879/// given Declarator.
1880DeclarationName Sema::GetNameForDeclarator(Declarator &D) {
Douglas Gregor02a24ee2009-11-03 16:56:39 +00001881 return GetNameFromUnqualifiedId(D.getName());
1882}
1883
1884/// \brief Retrieves the canonicalized name from a parsed unqualified-id.
John McCall129e2df2009-11-30 22:42:35 +00001885DeclarationName Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) {
Douglas Gregor3f9a0562009-11-03 01:35:08 +00001886 switch (Name.getKind()) {
Douglas Gregor02a24ee2009-11-03 16:56:39 +00001887 case UnqualifiedId::IK_Identifier:
1888 return DeclarationName(Name.Identifier);
Douglas Gregor3f9a0562009-11-03 01:35:08 +00001889
Douglas Gregor02a24ee2009-11-03 16:56:39 +00001890 case UnqualifiedId::IK_OperatorFunctionId:
1891 return Context.DeclarationNames.getCXXOperatorName(
Sean Huntf4fdd9b2009-11-29 03:04:53 +00001892 Name.OperatorFunctionId.Operator);
Sean Hunt0486d742009-11-28 04:44:28 +00001893
1894 case UnqualifiedId::IK_LiteralOperatorId:
Sean Hunt3e518bd2009-11-29 07:34:05 +00001895 return Context.DeclarationNames.getCXXLiteralOperatorName(
1896 Name.Identifier);
Sean Hunt0486d742009-11-28 04:44:28 +00001897
Douglas Gregor02a24ee2009-11-03 16:56:39 +00001898 case UnqualifiedId::IK_ConversionFunctionId: {
1899 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId);
1900 if (Ty.isNull())
1901 return DeclarationName();
Douglas Gregordb422df2009-09-25 21:45:23 +00001902
Douglas Gregor02a24ee2009-11-03 16:56:39 +00001903 return Context.DeclarationNames.getCXXConversionFunctionName(
Sean Huntf4fdd9b2009-11-29 03:04:53 +00001904 Context.getCanonicalType(Ty));
Douglas Gregor02a24ee2009-11-03 16:56:39 +00001905 }
1906
1907 case UnqualifiedId::IK_ConstructorName: {
1908 QualType Ty = GetTypeFromParser(Name.ConstructorName);
1909 if (Ty.isNull())
1910 return DeclarationName();
1911
1912 return Context.DeclarationNames.getCXXConstructorName(
Sean Huntf4fdd9b2009-11-29 03:04:53 +00001913 Context.getCanonicalType(Ty));
Douglas Gregor02a24ee2009-11-03 16:56:39 +00001914 }
1915
Douglas Gregor0efc2c12010-01-13 17:31:36 +00001916 case UnqualifiedId::IK_ConstructorTemplateId: {
1917 // In well-formed code, we can only have a constructor
1918 // template-id that refers to the current context, so go there
1919 // to find the actual type being constructed.
1920 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext);
1921 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name)
1922 return DeclarationName();
1923
1924 // Determine the type of the class being constructed.
John McCall3cb0ebd2010-03-10 03:28:59 +00001925 QualType CurClassType = Context.getTypeDeclType(CurClass);
Douglas Gregor0efc2c12010-01-13 17:31:36 +00001926
1927 // FIXME: Check two things: that the template-id names the same type as
1928 // CurClassType, and that the template-id does not occur when the name
1929 // was qualified.
1930
1931 return Context.DeclarationNames.getCXXConstructorName(
1932 Context.getCanonicalType(CurClassType));
1933 }
1934
Douglas Gregor02a24ee2009-11-03 16:56:39 +00001935 case UnqualifiedId::IK_DestructorName: {
1936 QualType Ty = GetTypeFromParser(Name.DestructorName);
1937 if (Ty.isNull())
1938 return DeclarationName();
1939
1940 return Context.DeclarationNames.getCXXDestructorName(
1941 Context.getCanonicalType(Ty));
1942 }
1943
1944 case UnqualifiedId::IK_TemplateId: {
1945 TemplateName TName
John McCall0bd6feb2009-12-02 08:04:21 +00001946 = TemplateName::getFromVoidPointer(Name.TemplateId->Template);
1947 return Context.getNameForTemplate(TName);
Douglas Gregor02a24ee2009-11-03 16:56:39 +00001948 }
Douglas Gregordb422df2009-09-25 21:45:23 +00001949 }
Douglas Gregor02a24ee2009-11-03 16:56:39 +00001950
Douglas Gregor10bd3682008-11-17 22:58:34 +00001951 assert(false && "Unknown name kind");
Douglas Gregor02a24ee2009-11-03 16:56:39 +00001952 return DeclarationName();
Douglas Gregor10bd3682008-11-17 22:58:34 +00001953}
1954
Douglas Gregor4ce205f2009-02-06 17:46:57 +00001955/// isNearlyMatchingFunction - Determine whether the C++ functions
1956/// Declaration and Definition are "nearly" matching. This heuristic
1957/// is used to improve diagnostics in the case where an out-of-line
1958/// function definition doesn't match any declaration within
1959/// the class or namespace.
1960static bool isNearlyMatchingFunction(ASTContext &Context,
1961 FunctionDecl *Declaration,
1962 FunctionDecl *Definition) {
Douglas Gregor584049d2008-12-15 23:53:10 +00001963 if (Declaration->param_size() != Definition->param_size())
1964 return false;
1965 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) {
1966 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType();
1967 QualType DefParamTy = Definition->getParamDecl(Idx)->getType();
1968
Douglas Gregora4923eb2009-11-16 21:35:15 +00001969 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(),
1970 DefParamTy.getNonReferenceType()))
Douglas Gregor584049d2008-12-15 23:53:10 +00001971 return false;
1972 }
1973
1974 return true;
1975}
1976
John McCall63b43852010-04-29 23:50:39 +00001977/// NeedsRebuildingInCurrentInstantiation - Checks whether the given
1978/// declarator needs to be rebuilt in the current instantiation.
1979/// Any bits of declarator which appear before the name are valid for
1980/// consideration here. That's specifically the type in the decl spec
1981/// and the base type in any member-pointer chunks.
1982static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D,
1983 DeclarationName Name) {
1984 // The types we specifically need to rebuild are:
1985 // - typenames, typeofs, and decltypes
1986 // - types which will become injected class names
1987 // Of course, we also need to rebuild any type referencing such a
1988 // type. It's safest to just say "dependent", but we call out a
1989 // few cases here.
1990
1991 DeclSpec &DS = D.getMutableDeclSpec();
1992 switch (DS.getTypeSpecType()) {
1993 case DeclSpec::TST_typename:
1994 case DeclSpec::TST_typeofType:
1995 case DeclSpec::TST_typeofExpr:
1996 case DeclSpec::TST_decltype: {
1997 // Grab the type from the parser.
1998 TypeSourceInfo *TSI = 0;
1999 QualType T = S.GetTypeFromParser(DS.getTypeRep(), &TSI);
2000 if (T.isNull() || !T->isDependentType()) break;
2001
2002 // Make sure there's a type source info. This isn't really much
2003 // of a waste; most dependent types should have type source info
2004 // attached already.
2005 if (!TSI)
2006 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc());
2007
2008 // Rebuild the type in the current instantiation.
2009 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name);
2010 if (!TSI) return true;
2011
2012 // Store the new type back in the decl spec.
2013 QualType LocType = S.CreateLocInfoType(TSI->getType(), TSI);
2014 DS.UpdateTypeRep(LocType.getAsOpaquePtr());
2015 break;
2016 }
2017
2018 default:
2019 // Nothing to do for these decl specs.
2020 break;
2021 }
2022
2023 // It doesn't matter what order we do this in.
2024 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) {
2025 DeclaratorChunk &Chunk = D.getTypeObject(I);
2026
2027 // The only type information in the declarator which can come
2028 // before the declaration name is the base type of a member
2029 // pointer.
2030 if (Chunk.Kind != DeclaratorChunk::MemberPointer)
2031 continue;
2032
2033 // Rebuild the scope specifier in-place.
2034 CXXScopeSpec &SS = Chunk.Mem.Scope();
2035 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS))
2036 return true;
2037 }
2038
2039 return false;
2040}
2041
Mike Stump1eb44332009-09-09 15:08:12 +00002042Sema::DeclPtrTy
2043Sema::HandleDeclarator(Scope *S, Declarator &D,
Douglas Gregore542c862009-06-23 23:11:28 +00002044 MultiTemplateParamsArg TemplateParamLists,
2045 bool IsFunctionDefinition) {
Douglas Gregor10bd3682008-11-17 22:58:34 +00002046 DeclarationName Name = GetNameForDeclarator(D);
2047
Chris Lattnere80a59c2007-07-25 00:24:17 +00002048 // All of these full declarators require an identifier. If it doesn't have
2049 // one, the ParsedFreeStandingDeclSpec action should be used.
Douglas Gregor10bd3682008-11-17 22:58:34 +00002050 if (!Name) {
Chris Lattnereaaebc72009-04-25 08:06:05 +00002051 if (!D.isInvalidType()) // Reject this if we think it is valid.
Chris Lattner1f6f54b2008-11-11 06:13:16 +00002052 Diag(D.getDeclSpec().getSourceRange().getBegin(),
Chris Lattnerfa25bbb2008-11-19 05:08:23 +00002053 diag::err_declarator_need_ident)
2054 << D.getDeclSpec().getSourceRange() << D.getSourceRange();
Chris Lattnerb28317a2009-03-28 19:18:32 +00002055 return DeclPtrTy();
Chris Lattnere80a59c2007-07-25 00:24:17 +00002056 }
Mike Stump1eb44332009-09-09 15:08:12 +00002057
Chris Lattner31e05722007-08-26 06:24:45 +00002058 // The scope passed in may not be a decl scope. Zip up the scope tree until
2059 // we find one that is.
Douglas Gregor44b43212008-12-11 16:49:14 +00002060 while ((S->getFlags() & Scope::DeclScope) == 0 ||
Douglas Gregoraaba5e32009-02-04 19:02:06 +00002061 (S->getFlags() & Scope::TemplateParamScope) != 0)
Chris Lattner31e05722007-08-26 06:24:45 +00002062 S = S->getParent();
Mike Stump1eb44332009-09-09 15:08:12 +00002063
John McCall63b43852010-04-29 23:50:39 +00002064 DeclContext *DC = CurContext;
2065 if (D.getCXXScopeSpec().isInvalid())
2066 D.setInvalidType();
2067 else if (D.getCXXScopeSpec().isSet()) {
2068 bool EnteringContext = !D.getDeclSpec().isFriendSpecified();
2069 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext);
2070 if (!DC) {
2071 // If we could not compute the declaration context, it's because the
2072 // declaration context is dependent but does not refer to a class,
2073 // class template, or class template partial specialization. Complain
2074 // and return early, to avoid the coming semantic disaster.
2075 Diag(D.getIdentifierLoc(),
2076 diag::err_template_qualified_declarator_no_match)
2077 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep()
2078 << D.getCXXScopeSpec().getRange();
2079 return DeclPtrTy();
2080 }
John McCall0dd7ceb2009-12-19 09:35:56 +00002081
John McCall63b43852010-04-29 23:50:39 +00002082 bool IsDependentContext = DC->isDependentContext();
John McCall0dd7ceb2009-12-19 09:35:56 +00002083
John McCall63b43852010-04-29 23:50:39 +00002084 if (!IsDependentContext &&
John McCall77bb1aa2010-05-01 00:40:08 +00002085 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC))
John McCall63b43852010-04-29 23:50:39 +00002086 return DeclPtrTy();
2087
2088 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) {
2089 Diag(D.getIdentifierLoc(),
2090 diag::err_member_def_undefined_record)
2091 << Name << DC << D.getCXXScopeSpec().getRange();
2092 D.setInvalidType();
2093 }
2094
2095 // Check whether we need to rebuild the type of the given
2096 // declaration in the current instantiation.
2097 if (EnteringContext && IsDependentContext &&
2098 TemplateParamLists.size() != 0) {
2099 ContextRAII SavedContext(*this, DC);
2100 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name))
2101 D.setInvalidType();
Douglas Gregor4a959d82009-08-06 16:20:37 +00002102 }
2103 }
Mike Stump1eb44332009-09-09 15:08:12 +00002104
Douglas Gregor4afa39d2009-01-20 01:17:11 +00002105 NamedDecl *New;
Douglas Gregorcda9c672009-02-16 17:45:42 +00002106
John McCallbf1a0282010-06-04 23:28:52 +00002107 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
2108 QualType R = TInfo->getType();
Douglas Gregord6f7e9d2009-02-24 20:03:32 +00002109
John McCall68263142009-11-18 22:49:29 +00002110 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName,
2111 ForRedeclaration);
2112
Argyrios Kyrtzidisef6e6472008-11-08 17:17:31 +00002113 // See if this is a redefinition of a variable in the same scope.
John McCall63b43852010-04-29 23:50:39 +00002114 if (!D.getCXXScopeSpec().isSet()) {
John McCall68263142009-11-18 22:49:29 +00002115 bool IsLinkageLookup = false;
Douglas Gregord6f7e9d2009-02-24 20:03:32 +00002116
2117 // If the declaration we're planning to build will be a function
2118 // or object with linkage, then look for another declaration with
2119 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6).
2120 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
2121 /* Do nothing*/;
2122 else if (R->isFunctionType()) {
Douglas Gregor6bec78d2009-07-07 17:00:05 +00002123 if (CurContext->isFunctionOrMethod() ||
2124 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static)
John McCall68263142009-11-18 22:49:29 +00002125 IsLinkageLookup = true;
Douglas Gregord6f7e9d2009-02-24 20:03:32 +00002126 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern)
John McCall68263142009-11-18 22:49:29 +00002127 IsLinkageLookup = true;
Douglas Gregor6bec78d2009-07-07 17:00:05 +00002128 else if (CurContext->getLookupContext()->isTranslationUnit() &&
2129 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static)
John McCall68263142009-11-18 22:49:29 +00002130 IsLinkageLookup = true;
2131
2132 if (IsLinkageLookup)
2133 Previous.clear(LookupRedeclarationWithLinkage);
Douglas Gregord6f7e9d2009-02-24 20:03:32 +00002134
John McCall68263142009-11-18 22:49:29 +00002135 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup);
Argyrios Kyrtzidisef6e6472008-11-08 17:17:31 +00002136 } else { // Something like "int foo::x;"
John McCall68263142009-11-18 22:49:29 +00002137 LookupQualifiedName(Previous, DC);
2138
2139 // Don't consider using declarations as previous declarations for
2140 // out-of-line members.
2141 RemoveUsingDecls(Previous);
Argyrios Kyrtzidisef6e6472008-11-08 17:17:31 +00002142
2143 // C++ 7.3.1.2p2:
2144 // Members (including explicit specializations of templates) of a named
2145 // namespace can also be defined outside that namespace by explicit
2146 // qualification of the name being defined, provided that the entity being
2147 // defined was already declared in the namespace and the definition appears
2148 // after the point of declaration in a namespace that encloses the
2149 // declarations namespace.
2150 //
Douglas Gregor584049d2008-12-15 23:53:10 +00002151 // Note that we only check the context at this point. We don't yet
2152 // have enough information to make sure that PrevDecl is actually
2153 // the declaration we want to match. For example, given:
2154 //
Douglas Gregor9d350972008-12-12 08:25:50 +00002155 // class X {
2156 // void f();
Douglas Gregor584049d2008-12-15 23:53:10 +00002157 // void f(float);
Douglas Gregor9d350972008-12-12 08:25:50 +00002158 // };
2159 //
Douglas Gregor584049d2008-12-15 23:53:10 +00002160 // void X::f(int) { } // ill-formed
2161 //
2162 // In this case, PrevDecl will point to the overload set
2163 // containing the two f's declared in X, but neither of them
Mike Stump1eb44332009-09-09 15:08:12 +00002164 // matches.
Douglas Gregor4ce205f2009-02-06 17:46:57 +00002165
2166 // First check whether we named the global scope.
2167 if (isa<TranslationUnitDecl>(DC)) {
Mike Stump1eb44332009-09-09 15:08:12 +00002168 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope)
Douglas Gregor4ce205f2009-02-06 17:46:57 +00002169 << Name << D.getCXXScopeSpec().getRange();
Sebastian Redl9770ef02009-11-08 11:36:54 +00002170 } else {
2171 DeclContext *Cur = CurContext;
2172 while (isa<LinkageSpecDecl>(Cur))
2173 Cur = Cur->getParent();
2174 if (!Cur->Encloses(DC)) {
2175 // The qualifying scope doesn't enclose the original declaration.
2176 // Emit diagnostic based on current scope.
2177 SourceLocation L = D.getIdentifierLoc();
2178 SourceRange R = D.getCXXScopeSpec().getRange();
2179 if (isa<FunctionDecl>(Cur))
2180 Diag(L, diag::err_invalid_declarator_in_function) << Name << R;
2181 else
2182 Diag(L, diag::err_invalid_declarator_scope)
2183 << Name << cast<NamedDecl>(DC) << R;
2184 D.setInvalidType();
2185 }
Argyrios Kyrtzidisef6e6472008-11-08 17:17:31 +00002186 }
2187 }
2188
John McCall68263142009-11-18 22:49:29 +00002189 if (Previous.isSingleResult() &&
2190 Previous.getFoundDecl()->isTemplateParameter()) {
Douglas Gregor72c3f312008-12-05 18:15:24 +00002191 // Maybe we will complain about the shadowed template parameter.
Mike Stump1eb44332009-09-09 15:08:12 +00002192 if (!D.isInvalidType())
John McCall68263142009-11-18 22:49:29 +00002193 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(),
2194 Previous.getFoundDecl()))
Chris Lattnereaaebc72009-04-25 08:06:05 +00002195 D.setInvalidType();
Mike Stump1eb44332009-09-09 15:08:12 +00002196
Douglas Gregor72c3f312008-12-05 18:15:24 +00002197 // Just pretend that we didn't see the previous declaration.
John McCall68263142009-11-18 22:49:29 +00002198 Previous.clear();
Douglas Gregor72c3f312008-12-05 18:15:24 +00002199 }
2200
Douglas Gregor2ce52f32008-04-13 21:07:44 +00002201 // In C++, the previous declaration we find might be a tag type
2202 // (class or enum). In this case, the new declaration will hide the
Douglas Gregor66973122009-01-28 17:15:10 +00002203 // tag type. Note that this does does not apply if we're declaring a
2204 // typedef (C++ [dcl.typedef]p4).
John McCall68263142009-11-18 22:49:29 +00002205 if (Previous.isSingleTagDecl() &&
Douglas Gregor66973122009-01-28 17:15:10 +00002206 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef)
John McCall68263142009-11-18 22:49:29 +00002207 Previous.clear();
Douglas Gregor2ce52f32008-04-13 21:07:44 +00002208
Douglas Gregorcda9c672009-02-16 17:45:42 +00002209 bool Redeclaration = false;
Reid Spencer5f016e22007-07-11 17:01:13 +00002210 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) {
Douglas Gregore542c862009-06-23 23:11:28 +00002211 if (TemplateParamLists.size()) {
2212 Diag(D.getIdentifierLoc(), diag::err_template_typedef);
2213 return DeclPtrTy();
2214 }
Mike Stump1eb44332009-09-09 15:08:12 +00002215
John McCalla93c9342009-12-07 02:54:59 +00002216 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration);
Douglas Gregord6f7e9d2009-02-24 20:03:32 +00002217 } else if (R->isFunctionType()) {
John McCalla93c9342009-12-07 02:54:59 +00002218 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous,
Douglas Gregore542c862009-06-23 23:11:28 +00002219 move(TemplateParamLists),
Chris Lattnereaaebc72009-04-25 08:06:05 +00002220 IsFunctionDefinition, Redeclaration);
Reid Spencer5f016e22007-07-11 17:01:13 +00002221 } else {
John McCalla93c9342009-12-07 02:54:59 +00002222 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous,
Douglas Gregordfe3f2d2009-07-22 17:18:37 +00002223 move(TemplateParamLists),
2224 Redeclaration);
Reid Spencer5f016e22007-07-11 17:01:13 +00002225 }
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00002226
2227 if (New == 0)
Chris Lattnerb28317a2009-03-28 19:18:32 +00002228 return DeclPtrTy();
Mike Stump1eb44332009-09-09 15:08:12 +00002229
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00002230 // If this has an identifier and is not an invalid redeclaration or
2231 // function template specialization, add it to the scope stack.
Eli Friedman6bc20132009-12-08 05:40:03 +00002232 if (Name && !(Redeclaration && New->isInvalidDecl()))
Argyrios Kyrtzidis87f3ff02008-04-12 00:47:19 +00002233 PushOnScopeChains(New, S);
Mike Stump1eb44332009-09-09 15:08:12 +00002234
Chris Lattnerb28317a2009-03-28 19:18:32 +00002235 return DeclPtrTy::make(New);
Reid Spencer5f016e22007-07-11 17:01:13 +00002236}
2237
Eli Friedman1ca48132009-02-21 00:44:51 +00002238/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array
2239/// types into constant array types in certain situations which would otherwise
2240/// be errors (for GCC compatibility).
2241static QualType TryToFixInvalidVariablyModifiedType(QualType T,
2242 ASTContext &Context,
2243 bool &SizeIsNegative) {
2244 // This method tries to turn a variable array into a constant
2245 // array even when the size isn't an ICE. This is necessary
2246 // for compatibility with code that depends on gcc's buggy
2247 // constant expression folding, like struct {char x[(int)(char*)2];}
2248 SizeIsNegative = false;
2249
John McCall0953e762009-09-24 19:53:00 +00002250 QualifierCollector Qs;
2251 const Type *Ty = Qs.strip(T);
2252
2253 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) {
Eli Friedman1ca48132009-02-21 00:44:51 +00002254 QualType Pointee = PTy->getPointeeType();
2255 QualType FixedType =
2256 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative);
2257 if (FixedType.isNull()) return FixedType;
Eli Friedman61125c82009-02-21 00:58:02 +00002258 FixedType = Context.getPointerType(FixedType);
John McCall0953e762009-09-24 19:53:00 +00002259 return Qs.apply(FixedType);
Eli Friedman1ca48132009-02-21 00:44:51 +00002260 }
2261
2262 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T);
Eli Friedmanbc592e62009-02-26 03:58:54 +00002263 if (!VLATy)
2264 return QualType();
2265 // FIXME: We should probably handle this case
2266 if (VLATy->getElementType()->isVariablyModifiedType())
2267 return QualType();
Mike Stump1eb44332009-09-09 15:08:12 +00002268
Eli Friedman1ca48132009-02-21 00:44:51 +00002269 Expr::EvalResult EvalResult;
2270 if (!VLATy->getSizeExpr() ||
Eli Friedmanbc592e62009-02-26 03:58:54 +00002271 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) ||
2272 !EvalResult.Val.isInt())
Eli Friedman1ca48132009-02-21 00:44:51 +00002273 return QualType();
Eli Friedmanbc592e62009-02-26 03:58:54 +00002274
Eli Friedman1ca48132009-02-21 00:44:51 +00002275 llvm::APSInt &Res = EvalResult.Val.getInt();
Douglas Gregor7e7eb3d2009-07-06 15:59:29 +00002276 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) {
John McCall46a617a2009-10-16 00:14:28 +00002277 // TODO: preserve the size expression in declarator info
2278 return Context.getConstantArrayType(VLATy->getElementType(),
2279 Res, ArrayType::Normal, 0);
Douglas Gregor7e7eb3d2009-07-06 15:59:29 +00002280 }
Eli Friedman1ca48132009-02-21 00:44:51 +00002281
2282 SizeIsNegative = true;
2283 return QualType();
2284}
2285
Douglas Gregor63935192009-03-02 00:19:53 +00002286/// \brief Register the given locally-scoped external C declaration so
2287/// that it can be found later for redeclarations
Mike Stump1eb44332009-09-09 15:08:12 +00002288void
John McCall68263142009-11-18 22:49:29 +00002289Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND,
2290 const LookupResult &Previous,
Douglas Gregor63935192009-03-02 00:19:53 +00002291 Scope *S) {
2292 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() &&
2293 "Decl is not a locally-scoped decl!");
2294 // Note that we have a locally-scoped external with this name.
2295 LocallyScopedExternalDecls[ND->getDeclName()] = ND;
2296
John McCall68263142009-11-18 22:49:29 +00002297 if (!Previous.isSingleResult())
Douglas Gregor63935192009-03-02 00:19:53 +00002298 return;
2299
John McCall68263142009-11-18 22:49:29 +00002300 NamedDecl *PrevDecl = Previous.getFoundDecl();
2301
Douglas Gregor63935192009-03-02 00:19:53 +00002302 // If there was a previous declaration of this variable, it may be
2303 // in our identifier chain. Update the identifier chain with the new
2304 // declaration.
Douglas Gregor2dc0e642009-03-23 23:06:20 +00002305 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) {
Douglas Gregor63935192009-03-02 00:19:53 +00002306 // The previous declaration was found on the identifer resolver
2307 // chain, so remove it from its scope.
Chris Lattnerb28317a2009-03-28 19:18:32 +00002308 while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl)))
Douglas Gregor63935192009-03-02 00:19:53 +00002309 S = S->getParent();
2310
2311 if (S)
Chris Lattnerb28317a2009-03-28 19:18:32 +00002312 S->RemoveDecl(DeclPtrTy::make(PrevDecl));
Douglas Gregor63935192009-03-02 00:19:53 +00002313 }
2314}
2315
Eli Friedman85a53192009-04-07 19:37:57 +00002316/// \brief Diagnose function specifiers on a declaration of an identifier that
2317/// does not identify a function.
2318void Sema::DiagnoseFunctionSpecifiers(Declarator& D) {
2319 // FIXME: We should probably indicate the identifier in question to avoid
2320 // confusion for constructs like "inline int a(), b;"
2321 if (D.getDeclSpec().isInlineSpecified())
Mike Stump1eb44332009-09-09 15:08:12 +00002322 Diag(D.getDeclSpec().getInlineSpecLoc(),
Eli Friedman85a53192009-04-07 19:37:57 +00002323 diag::err_inline_non_function);
2324
2325 if (D.getDeclSpec().isVirtualSpecified())
Mike Stump1eb44332009-09-09 15:08:12 +00002326 Diag(D.getDeclSpec().getVirtualSpecLoc(),
Eli Friedman85a53192009-04-07 19:37:57 +00002327 diag::err_virtual_non_function);
2328
2329 if (D.getDeclSpec().isExplicitSpecified())
Mike Stump1eb44332009-09-09 15:08:12 +00002330 Diag(D.getDeclSpec().getExplicitSpecLoc(),
Eli Friedman85a53192009-04-07 19:37:57 +00002331 diag::err_explicit_non_function);
2332}
2333
Douglas Gregor4afa39d2009-01-20 01:17:11 +00002334NamedDecl*
Zhongxing Xud5ed8c32009-01-16 03:34:13 +00002335Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC,
John McCalla93c9342009-12-07 02:54:59 +00002336 QualType R, TypeSourceInfo *TInfo,
John McCall68263142009-11-18 22:49:29 +00002337 LookupResult &Previous, bool &Redeclaration) {
Zhongxing Xud5ed8c32009-01-16 03:34:13 +00002338 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1).
2339 if (D.getCXXScopeSpec().isSet()) {
2340 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator)
2341 << D.getCXXScopeSpec().getRange();
Chris Lattnereaaebc72009-04-25 08:06:05 +00002342 D.setInvalidType();
Zhongxing Xud5ed8c32009-01-16 03:34:13 +00002343 // Pretend we didn't see the scope specifier.
Douglas Gregor9de672f2010-03-23 15:26:55 +00002344 DC = CurContext;
2345 Previous.clear();
Zhongxing Xud5ed8c32009-01-16 03:34:13 +00002346 }
2347
Douglas Gregor021c3b32009-03-11 23:00:04 +00002348 if (getLangOptions().CPlusPlus) {
2349 // Check that there are no default arguments (C++ only).
Zhongxing Xud5ed8c32009-01-16 03:34:13 +00002350 CheckExtraCXXDefaultArguments(D);
Douglas Gregor021c3b32009-03-11 23:00:04 +00002351 }
2352
Eli Friedman85a53192009-04-07 19:37:57 +00002353 DiagnoseFunctionSpecifiers(D);
2354
Eli Friedman63054b32009-04-19 20:27:55 +00002355 if (D.getDeclSpec().isThreadSpecified())
2356 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
2357
John McCalla93c9342009-12-07 02:54:59 +00002358 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo);
Zhongxing Xud5ed8c32009-01-16 03:34:13 +00002359 if (!NewTD) return 0;
Mike Stump1eb44332009-09-09 15:08:12 +00002360
Zhongxing Xud5ed8c32009-01-16 03:34:13 +00002361 // Handle attributes prior to checking for duplicates in MergeVarDecl
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00002362 ProcessDeclAttributes(S, NewTD, D);
John McCall68263142009-11-18 22:49:29 +00002363
Zhongxing Xud5ed8c32009-01-16 03:34:13 +00002364 // Merge the decl with the existing one if appropriate. If the decl is
2365 // in an outer scope, it isn't the same thing.
John McCall68263142009-11-18 22:49:29 +00002366 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false);
2367 if (!Previous.empty()) {
Douglas Gregorcda9c672009-02-16 17:45:42 +00002368 Redeclaration = true;
John McCall68263142009-11-18 22:49:29 +00002369 MergeTypeDefDecl(NewTD, Previous);
Zhongxing Xud5ed8c32009-01-16 03:34:13 +00002370 }
2371
Chris Lattner38c5ebd2009-04-19 05:21:20 +00002372 // C99 6.7.7p2: If a typedef name specifies a variably modified type
2373 // then it shall have block scope.
2374 QualType T = NewTD->getUnderlyingType();
2375 if (T->isVariablyModifiedType()) {
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00002376 FunctionNeedsScopeChecking() = true;
Mike Stump1eb44332009-09-09 15:08:12 +00002377
Chris Lattner38c5ebd2009-04-19 05:21:20 +00002378 if (S->getFnParent() == 0) {
Eli Friedman1ca48132009-02-21 00:44:51 +00002379 bool SizeIsNegative;
2380 QualType FixedTy =
2381 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative);
2382 if (!FixedTy.isNull()) {
2383 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size);
John McCalla93c9342009-12-07 02:54:59 +00002384 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy));
Eli Friedman1ca48132009-02-21 00:44:51 +00002385 } else {
2386 if (SizeIsNegative)
2387 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size);
2388 else if (T->isVariableArrayType())
2389 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope);
2390 else
2391 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope);
Chris Lattnereaaebc72009-04-25 08:06:05 +00002392 NewTD->setInvalidDecl();
Eli Friedman1ca48132009-02-21 00:44:51 +00002393 }
Zhongxing Xud5ed8c32009-01-16 03:34:13 +00002394 }
2395 }
Douglas Gregorc29f77b2009-07-07 16:35:42 +00002396
2397 // If this is the C FILE type, notify the AST context.
2398 if (IdentifierInfo *II = NewTD->getIdentifier())
2399 if (!NewTD->isInvalidDecl() &&
Mike Stump782fa302009-07-28 02:25:19 +00002400 NewTD->getDeclContext()->getLookupContext()->isTranslationUnit()) {
2401 if (II->isStr("FILE"))
2402 Context.setFILEDecl(NewTD);
2403 else if (II->isStr("jmp_buf"))
2404 Context.setjmp_bufDecl(NewTD);
2405 else if (II->isStr("sigjmp_buf"))
2406 Context.setsigjmp_bufDecl(NewTD);
2407 }
2408
Zhongxing Xud5ed8c32009-01-16 03:34:13 +00002409 return NewTD;
2410}
2411
Douglas Gregor8f301052009-02-24 19:23:27 +00002412/// \brief Determines whether the given declaration is an out-of-scope
2413/// previous declaration.
2414///
2415/// This routine should be invoked when name lookup has found a
2416/// previous declaration (PrevDecl) that is not in the scope where a
2417/// new declaration by the same name is being introduced. If the new
2418/// declaration occurs in a local scope, previous declarations with
2419/// linkage may still be considered previous declarations (C99
2420/// 6.2.2p4-5, C++ [basic.link]p6).
2421///
2422/// \param PrevDecl the previous declaration found by name
2423/// lookup
Mike Stump1eb44332009-09-09 15:08:12 +00002424///
Douglas Gregor8f301052009-02-24 19:23:27 +00002425/// \param DC the context in which the new declaration is being
2426/// declared.
2427///
2428/// \returns true if PrevDecl is an out-of-scope previous declaration
2429/// for a new delcaration with the same name.
Mike Stump1eb44332009-09-09 15:08:12 +00002430static bool
Douglas Gregor8f301052009-02-24 19:23:27 +00002431isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC,
2432 ASTContext &Context) {
2433 if (!PrevDecl)
2434 return 0;
2435
Douglas Gregord6f7e9d2009-02-24 20:03:32 +00002436 if (!PrevDecl->hasLinkage())
2437 return false;
Douglas Gregor8f301052009-02-24 19:23:27 +00002438
2439 if (Context.getLangOptions().CPlusPlus) {
2440 // C++ [basic.link]p6:
2441 // If there is a visible declaration of an entity with linkage
2442 // having the same name and type, ignoring entities declared
2443 // outside the innermost enclosing namespace scope, the block
2444 // scope declaration declares that same entity and receives the
2445 // linkage of the previous declaration.
2446 DeclContext *OuterContext = DC->getLookupContext();
2447 if (!OuterContext->isFunctionOrMethod())
2448 // This rule only applies to block-scope declarations.
2449 return false;
2450 else {
2451 DeclContext *PrevOuterContext = PrevDecl->getDeclContext();
2452 if (PrevOuterContext->isRecord())
2453 // We found a member function: ignore it.
2454 return false;
2455 else {
2456 // Find the innermost enclosing namespace for the new and
2457 // previous declarations.
2458 while (!OuterContext->isFileContext())
2459 OuterContext = OuterContext->getParent();
2460 while (!PrevOuterContext->isFileContext())
2461 PrevOuterContext = PrevOuterContext->getParent();
Mike Stump1eb44332009-09-09 15:08:12 +00002462
Douglas Gregor8f301052009-02-24 19:23:27 +00002463 // The previous declaration is in a different namespace, so it
2464 // isn't the same function.
Mike Stump1eb44332009-09-09 15:08:12 +00002465 if (OuterContext->getPrimaryContext() !=
Douglas Gregor8f301052009-02-24 19:23:27 +00002466 PrevOuterContext->getPrimaryContext())
2467 return false;
2468 }
2469 }
2470 }
2471
Douglas Gregor8f301052009-02-24 19:23:27 +00002472 return true;
2473}
2474
John McCallb6217662010-03-15 10:12:16 +00002475static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) {
2476 CXXScopeSpec &SS = D.getCXXScopeSpec();
2477 if (!SS.isSet()) return;
2478 DD->setQualifierInfo(static_cast<NestedNameSpecifier*>(SS.getScopeRep()),
2479 SS.getRange());
2480}
2481
Douglas Gregor4afa39d2009-01-20 01:17:11 +00002482NamedDecl*
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00002483Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC,
John McCalla93c9342009-12-07 02:54:59 +00002484 QualType R, TypeSourceInfo *TInfo,
John McCall68263142009-11-18 22:49:29 +00002485 LookupResult &Previous,
Douglas Gregordfe3f2d2009-07-22 17:18:37 +00002486 MultiTemplateParamsArg TemplateParamLists,
Douglas Gregorcda9c672009-02-16 17:45:42 +00002487 bool &Redeclaration) {
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00002488 DeclarationName Name = GetNameForDeclarator(D);
2489
2490 // Check that there are no default arguments (C++ only).
2491 if (getLangOptions().CPlusPlus)
2492 CheckExtraCXXDefaultArguments(D);
2493
Douglas Gregor16573fa2010-04-19 22:54:31 +00002494 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec();
2495 assert(SCSpec != DeclSpec::SCS_typedef &&
2496 "Parser allowed 'typedef' as storage class VarDecl.");
Abramo Bagnarab21b4052010-04-28 13:11:54 +00002497 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec, 0);
Douglas Gregor16573fa2010-04-19 22:54:31 +00002498 if (SCSpec == DeclSpec::SCS_mutable) {
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00002499 // mutable can only appear on non-static class members, so it's always
2500 // an error here
2501 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember);
Chris Lattnereaaebc72009-04-25 08:06:05 +00002502 D.setInvalidType();
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00002503 SC = VarDecl::None;
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00002504 }
Douglas Gregor16573fa2010-04-19 22:54:31 +00002505 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten();
2506 VarDecl::StorageClass SCAsWritten
Abramo Bagnarab21b4052010-04-28 13:11:54 +00002507 = StorageClassSpecToVarDeclStorageClass(SCSpec, DC);
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00002508
2509 IdentifierInfo *II = Name.getAsIdentifierInfo();
2510 if (!II) {
2511 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name)
2512 << Name.getAsString();
2513 return 0;
2514 }
2515
Eli Friedman85a53192009-04-07 19:37:57 +00002516 DiagnoseFunctionSpecifiers(D);
Douglas Gregor021c3b32009-03-11 23:00:04 +00002517
Douglas Gregor2d2e9cf2009-03-11 20:22:50 +00002518 if (!DC->isRecord() && S->getFnParent() == 0) {
2519 // C99 6.9p2: The storage-class specifiers auto and register shall not
2520 // appear in the declaration specifiers in an external declaration.
2521 if (SC == VarDecl::Auto || SC == VarDecl::Register) {
Mike Stump1eb44332009-09-09 15:08:12 +00002522
Chris Lattnerd4b19d52009-05-12 21:44:00 +00002523 // If this is a register variable with an asm label specified, then this
2524 // is a GNU extension.
2525 if (SC == VarDecl::Register && D.getAsmLabel())
2526 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register);
2527 else
2528 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope);
Chris Lattnereaaebc72009-04-25 08:06:05 +00002529 D.setInvalidType();
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00002530 }
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00002531 }
Douglas Gregor656de632009-03-11 23:52:16 +00002532 if (DC->isRecord() && !CurContext->isRecord()) {
2533 // This is an out-of-line definition of a static data member.
2534 if (SC == VarDecl::Static) {
Mike Stump1eb44332009-09-09 15:08:12 +00002535 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
Douglas Gregor656de632009-03-11 23:52:16 +00002536 diag::err_static_out_of_line)
Douglas Gregor849b2432010-03-31 17:46:05 +00002537 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
Douglas Gregor656de632009-03-11 23:52:16 +00002538 } else if (SC == VarDecl::None)
2539 SC = VarDecl::Static;
2540 }
Anders Carlssone98da2e2009-06-24 00:28:53 +00002541 if (SC == VarDecl::Static) {
2542 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) {
2543 if (RD->isLocalClass())
Mike Stump1eb44332009-09-09 15:08:12 +00002544 Diag(D.getIdentifierLoc(),
Anders Carlssone98da2e2009-06-24 00:28:53 +00002545 diag::err_static_data_member_not_allowed_in_local_class)
2546 << Name << RD->getDeclName();
2547 }
2548 }
Mike Stump1eb44332009-09-09 15:08:12 +00002549
Douglas Gregordfe3f2d2009-07-22 17:18:37 +00002550 // Match up the template parameter lists with the scope specifier, then
2551 // determine whether we have a template or a template specialization.
Douglas Gregor1fef4e62009-10-07 22:35:40 +00002552 bool isExplicitSpecialization = false;
Abramo Bagnara9b934882010-06-12 08:15:14 +00002553 unsigned NumMatchedTemplateParamLists = TemplateParamLists.size();
Douglas Gregordfe3f2d2009-07-22 17:18:37 +00002554 if (TemplateParameterList *TemplateParams
Douglas Gregor1fef4e62009-10-07 22:35:40 +00002555 = MatchTemplateParametersToScopeSpecifier(
Douglas Gregordfe3f2d2009-07-22 17:18:37 +00002556 D.getDeclSpec().getSourceRange().getBegin(),
Douglas Gregor1fef4e62009-10-07 22:35:40 +00002557 D.getCXXScopeSpec(),
Douglas Gregor27eeb5e2009-07-22 22:05:02 +00002558 (TemplateParameterList**)TemplateParamLists.get(),
Douglas Gregor1fef4e62009-10-07 22:35:40 +00002559 TemplateParamLists.size(),
John McCall77e8b112010-04-13 20:37:33 +00002560 /*never a friend*/ false,
Douglas Gregor1fef4e62009-10-07 22:35:40 +00002561 isExplicitSpecialization)) {
Abramo Bagnara9b934882010-06-12 08:15:14 +00002562 // All but one template parameter lists have been matching.
2563 --NumMatchedTemplateParamLists;
2564
Douglas Gregordfe3f2d2009-07-22 17:18:37 +00002565 if (TemplateParams->size() > 0) {
2566 // There is no such thing as a variable template.
2567 Diag(D.getIdentifierLoc(), diag::err_template_variable)
2568 << II
2569 << SourceRange(TemplateParams->getTemplateLoc(),
2570 TemplateParams->getRAngleLoc());
2571 return 0;
2572 } else {
2573 // There is an extraneous 'template<>' for this variable. Complain
2574 // about it, but allow the declaration of the variable.
Mike Stump1eb44332009-09-09 15:08:12 +00002575 Diag(TemplateParams->getTemplateLoc(),
Douglas Gregor7cdbc582009-07-22 23:48:44 +00002576 diag::err_template_variable_noparams)
Douglas Gregordfe3f2d2009-07-22 17:18:37 +00002577 << II
2578 << SourceRange(TemplateParams->getTemplateLoc(),
Mike Stump1eb44332009-09-09 15:08:12 +00002579 TemplateParams->getRAngleLoc());
Douglas Gregor1fef4e62009-10-07 22:35:40 +00002580
2581 isExplicitSpecialization = true;
Douglas Gregordfe3f2d2009-07-22 17:18:37 +00002582 }
Mike Stump1eb44332009-09-09 15:08:12 +00002583 }
2584
Douglas Gregor16573fa2010-04-19 22:54:31 +00002585 VarDecl *NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(),
2586 II, R, TInfo, SC, SCAsWritten);
Eli Friedman63054b32009-04-19 20:27:55 +00002587
Chris Lattnereaaebc72009-04-25 08:06:05 +00002588 if (D.isInvalidType())
2589 NewVD->setInvalidDecl();
Mike Stump1eb44332009-09-09 15:08:12 +00002590
John McCallb6217662010-03-15 10:12:16 +00002591 SetNestedNameSpecifier(NewVD, D);
2592
Abramo Bagnara9b934882010-06-12 08:15:14 +00002593 if (NumMatchedTemplateParamLists > 0) {
Douglas Gregorc722ea42010-06-15 17:44:38 +00002594 NewVD->setTemplateParameterListsInfo(Context,
2595 NumMatchedTemplateParamLists,
Abramo Bagnara9b934882010-06-12 08:15:14 +00002596 (TemplateParameterList**)TemplateParamLists.release());
2597 }
2598
Eli Friedman63054b32009-04-19 20:27:55 +00002599 if (D.getDeclSpec().isThreadSpecified()) {
2600 if (NewVD->hasLocalStorage())
2601 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global);
Eli Friedman4fb71b02009-04-19 21:48:33 +00002602 else if (!Context.Target.isTLSSupported())
2603 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported);
Eli Friedman63054b32009-04-19 20:27:55 +00002604 else
2605 NewVD->setThreadSpecified(true);
2606 }
Douglas Gregor4afa39d2009-01-20 01:17:11 +00002607
Douglas Gregor656de632009-03-11 23:52:16 +00002608 // Set the lexical context. If the declarator has a C++ scope specifier, the
2609 // lexical context will be different from the semantic context.
2610 NewVD->setLexicalDeclContext(CurContext);
2611
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00002612 // Handle attributes prior to checking for duplicates in MergeVarDecl
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00002613 ProcessDeclAttributes(S, NewVD, D);
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00002614
2615 // Handle GNU asm-label extension (encoded as an attribute).
2616 if (Expr *E = (Expr*) D.getAsmLabel()) {
2617 // The parser guarantees this is a string.
Mike Stump1eb44332009-09-09 15:08:12 +00002618 StringLiteral *SE = cast<StringLiteral>(E);
Ted Kremenek3d2c43e2010-02-11 05:28:37 +00002619 NewVD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getString()));
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00002620 }
2621
John McCall8472af42010-03-16 21:48:18 +00002622 // Diagnose shadowed variables before filtering for scope.
John McCalla369a952010-03-20 04:12:52 +00002623 if (!D.getCXXScopeSpec().isSet())
John McCall053f4bd2010-03-22 09:20:08 +00002624 CheckShadow(S, NewVD, Previous);
John McCall8472af42010-03-16 21:48:18 +00002625
John McCall68263142009-11-18 22:49:29 +00002626 // Don't consider existing declarations that are in a different
2627 // scope and are out-of-semantic-context declarations (if the new
2628 // declaration has linkage).
2629 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage());
Douglas Gregor251b4ff2009-10-08 07:24:58 +00002630
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002631 // Merge the decl with the existing one if appropriate.
John McCall68263142009-11-18 22:49:29 +00002632 if (!Previous.empty()) {
2633 if (Previous.isSingleResult() &&
2634 isa<FieldDecl>(Previous.getFoundDecl()) &&
2635 D.getCXXScopeSpec().isSet()) {
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002636 // The user tried to define a non-static data member
2637 // out-of-line (C++ [dcl.meaning]p1).
2638 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line)
2639 << D.getCXXScopeSpec().getRange();
John McCall68263142009-11-18 22:49:29 +00002640 Previous.clear();
Chris Lattnereaaebc72009-04-25 08:06:05 +00002641 NewVD->setInvalidDecl();
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002642 }
2643 } else if (D.getCXXScopeSpec().isSet()) {
2644 // No previous declaration in the qualifying scope.
Douglas Gregor3f093272009-10-13 21:16:44 +00002645 Diag(D.getIdentifierLoc(), diag::err_no_member)
2646 << Name << computeDeclContext(D.getCXXScopeSpec(), true)
2647 << D.getCXXScopeSpec().getRange();
Chris Lattnereaaebc72009-04-25 08:06:05 +00002648 NewVD->setInvalidDecl();
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002649 }
2650
John McCall68263142009-11-18 22:49:29 +00002651 CheckVariableDeclaration(NewVD, Previous, Redeclaration);
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002652
Douglas Gregor251b4ff2009-10-08 07:24:58 +00002653 // This is an explicit specialization of a static data member. Check it.
2654 if (isExplicitSpecialization && !NewVD->isInvalidDecl() &&
John McCall68263142009-11-18 22:49:29 +00002655 CheckMemberSpecialization(NewVD, Previous))
Douglas Gregor251b4ff2009-10-08 07:24:58 +00002656 NewVD->setInvalidDecl();
John McCall68263142009-11-18 22:49:29 +00002657
Ryan Flynn478fbc62009-07-25 22:29:44 +00002658 // attributes declared post-definition are currently ignored
John McCall68263142009-11-18 22:49:29 +00002659 if (Previous.isSingleResult()) {
Sebastian Redl31310a22010-02-01 20:16:42 +00002660 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl());
2661 if (Def && (Def = Def->getDefinition()) &&
2662 Def != NewVD && D.hasAttributes()) {
Ryan Flynn478fbc62009-07-25 22:29:44 +00002663 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition);
2664 Diag(Def->getLocation(), diag::note_previous_definition);
2665 }
2666 }
2667
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002668 // If this is a locally-scoped extern C variable, update the map of
2669 // such variables.
Douglas Gregor48a83b52009-09-12 00:17:51 +00002670 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() &&
Chris Lattnereaaebc72009-04-25 08:06:05 +00002671 !NewVD->isInvalidDecl())
John McCall68263142009-11-18 22:49:29 +00002672 RegisterLocallyScopedExternCDecl(NewVD, Previous, S);
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002673
2674 return NewVD;
2675}
2676
John McCall053f4bd2010-03-22 09:20:08 +00002677/// \brief Diagnose variable or built-in function shadowing. Implements
2678/// -Wshadow.
John McCall8472af42010-03-16 21:48:18 +00002679///
John McCall053f4bd2010-03-22 09:20:08 +00002680/// This method is called whenever a VarDecl is added to a "useful"
2681/// scope.
John McCall8472af42010-03-16 21:48:18 +00002682///
John McCalla369a952010-03-20 04:12:52 +00002683/// \param S the scope in which the shadowing name is being declared
2684/// \param R the lookup of the name
John McCall8472af42010-03-16 21:48:18 +00002685///
John McCall053f4bd2010-03-22 09:20:08 +00002686void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) {
John McCall8472af42010-03-16 21:48:18 +00002687 // Return if warning is ignored.
2688 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow) == Diagnostic::Ignored)
2689 return;
2690
John McCalla369a952010-03-20 04:12:52 +00002691 // Don't diagnose declarations at file scope. The scope might not
2692 // have a DeclContext if (e.g.) we're parsing a function prototype.
2693 DeclContext *NewDC = static_cast<DeclContext*>(S->getEntity());
2694 if (NewDC && NewDC->isFileContext())
John McCall8472af42010-03-16 21:48:18 +00002695 return;
John McCalla369a952010-03-20 04:12:52 +00002696
2697 // Only diagnose if we're shadowing an unambiguous field or variable.
Douglas Gregorc48c9162010-03-17 16:03:44 +00002698 if (R.getResultKind() != LookupResult::Found)
John McCall8472af42010-03-16 21:48:18 +00002699 return;
John McCall8472af42010-03-16 21:48:18 +00002700
John McCall8472af42010-03-16 21:48:18 +00002701 NamedDecl* ShadowedDecl = R.getFoundDecl();
2702 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl))
2703 return;
2704
John McCalla369a952010-03-20 04:12:52 +00002705 DeclContext *OldDC = ShadowedDecl->getDeclContext();
2706
2707 // Only warn about certain kinds of shadowing for class members.
2708 if (NewDC && NewDC->isRecord()) {
2709 // In particular, don't warn about shadowing non-class members.
2710 if (!OldDC->isRecord())
2711 return;
2712
2713 // TODO: should we warn about static data members shadowing
2714 // static data members from base classes?
2715
2716 // TODO: don't diagnose for inaccessible shadowed members.
2717 // This is hard to do perfectly because we might friend the
2718 // shadowing context, but that's just a false negative.
2719 }
2720
2721 // Determine what kind of declaration we're shadowing.
John McCall8472af42010-03-16 21:48:18 +00002722 unsigned Kind;
John McCalla369a952010-03-20 04:12:52 +00002723 if (isa<RecordDecl>(OldDC)) {
John McCall8472af42010-03-16 21:48:18 +00002724 if (isa<FieldDecl>(ShadowedDecl))
2725 Kind = 3; // field
2726 else
2727 Kind = 2; // static data member
John McCalla369a952010-03-20 04:12:52 +00002728 } else if (OldDC->isFileContext())
John McCall8472af42010-03-16 21:48:18 +00002729 Kind = 1; // global
2730 else
2731 Kind = 0; // local
2732
John McCalla369a952010-03-20 04:12:52 +00002733 DeclarationName Name = R.getLookupName();
2734
John McCall8472af42010-03-16 21:48:18 +00002735 // Emit warning and note.
John McCalla369a952010-03-20 04:12:52 +00002736 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC;
John McCall8472af42010-03-16 21:48:18 +00002737 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration);
2738}
2739
John McCall053f4bd2010-03-22 09:20:08 +00002740/// \brief Check -Wshadow without the advantage of a previous lookup.
2741void Sema::CheckShadow(Scope *S, VarDecl *D) {
2742 LookupResult R(*this, D->getDeclName(), D->getLocation(),
2743 Sema::LookupOrdinaryName, Sema::ForRedeclaration);
2744 LookupName(R, S);
2745 CheckShadow(S, D, R);
2746}
2747
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002748/// \brief Perform semantic checking on a newly-created variable
2749/// declaration.
2750///
2751/// This routine performs all of the type-checking required for a
Douglas Gregor180bb632009-05-01 15:47:09 +00002752/// variable declaration once it has been built. It is used both to
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002753/// check variables after they have been parsed and their declarators
Douglas Gregor180bb632009-05-01 15:47:09 +00002754/// have been translated into a declaration, and to check variables
2755/// that have been instantiated from a template.
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002756///
Chris Lattnereaaebc72009-04-25 08:06:05 +00002757/// Sets NewVD->isInvalidDecl() if an error was encountered.
John McCall68263142009-11-18 22:49:29 +00002758void Sema::CheckVariableDeclaration(VarDecl *NewVD,
2759 LookupResult &Previous,
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002760 bool &Redeclaration) {
Chris Lattnereaaebc72009-04-25 08:06:05 +00002761 // If the decl is already known invalid, don't check it.
2762 if (NewVD->isInvalidDecl())
2763 return;
Mike Stump1eb44332009-09-09 15:08:12 +00002764
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002765 QualType T = NewVD->getType();
2766
John McCallc12c5bb2010-05-15 11:32:37 +00002767 if (T->isObjCObjectType()) {
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002768 Diag(NewVD->getLocation(), diag::err_statically_allocated_object);
Chris Lattnereaaebc72009-04-25 08:06:05 +00002769 return NewVD->setInvalidDecl();
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002770 }
Mike Stump1eb44332009-09-09 15:08:12 +00002771
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00002772 // Emit an error if an address space was applied to decl with local storage.
2773 // This includes arrays of objects with address space qualifiers, but not
2774 // automatic variables that point to other address spaces.
2775 // ISO/IEC TR 18037 S5.1.2
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002776 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) {
2777 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl);
Chris Lattnereaaebc72009-04-25 08:06:05 +00002778 return NewVD->setInvalidDecl();
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00002779 }
Fariborz Jahanian7b5b3172009-02-21 19:44:02 +00002780
Mike Stumpf33651c2009-04-14 00:57:29 +00002781 if (NewVD->hasLocalStorage() && T.isObjCGCWeak()
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00002782 && !NewVD->hasAttr<BlocksAttr>())
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002783 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local);
Fariborz Jahanian7b5b3172009-02-21 19:44:02 +00002784
Chris Lattner38c5ebd2009-04-19 05:21:20 +00002785 bool isVM = T->isVariablyModifiedType();
Chris Lattnerbe6d2592009-07-19 20:17:11 +00002786 if (isVM || NewVD->hasAttr<CleanupAttr>() ||
Chris Lattner6d97e5e2010-03-01 20:59:53 +00002787 NewVD->hasAttr<BlocksAttr>() ||
2788 // FIXME: We need to diagnose jumps passed initialized variables in C++.
2789 // However, this turns on the scope checker for everything with a variable
2790 // which may impact compile time. See if we can find a better solution
2791 // to this, perhaps only checking functions that contain gotos in C++?
2792 (LangOpts.CPlusPlus && NewVD->hasLocalStorage()))
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00002793 FunctionNeedsScopeChecking() = true;
Mike Stump1eb44332009-09-09 15:08:12 +00002794
Chris Lattner38c5ebd2009-04-19 05:21:20 +00002795 if ((isVM && NewVD->hasLinkage()) ||
2796 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) {
Anders Carlsson1a7acfa2009-02-28 21:56:50 +00002797 bool SizeIsNegative;
2798 QualType FixedTy =
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002799 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative);
Mike Stump1eb44332009-09-09 15:08:12 +00002800
Chris Lattnereaaebc72009-04-25 08:06:05 +00002801 if (FixedTy.isNull() && T->isVariableArrayType()) {
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002802 const VariableArrayType *VAT = Context.getAsVariableArrayType(T);
Mike Stump1eb44332009-09-09 15:08:12 +00002803 // FIXME: This won't give the correct result for
2804 // int a[10][n];
Anders Carlsson1a7acfa2009-02-28 21:56:50 +00002805 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange();
Mike Stump1eb44332009-09-09 15:08:12 +00002806
Anders Carlsson1a7acfa2009-02-28 21:56:50 +00002807 if (NewVD->isFileVarDecl())
2808 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope)
Chris Lattnereaaebc72009-04-25 08:06:05 +00002809 << SizeRange;
Anders Carlsson1a7acfa2009-02-28 21:56:50 +00002810 else if (NewVD->getStorageClass() == VarDecl::Static)
2811 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage)
Chris Lattnereaaebc72009-04-25 08:06:05 +00002812 << SizeRange;
Anders Carlsson1a7acfa2009-02-28 21:56:50 +00002813 else
2814 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage)
Chris Lattnereaaebc72009-04-25 08:06:05 +00002815 << SizeRange;
2816 return NewVD->setInvalidDecl();
Mike Stump1eb44332009-09-09 15:08:12 +00002817 }
2818
Chris Lattnereaaebc72009-04-25 08:06:05 +00002819 if (FixedTy.isNull()) {
Anders Carlsson1a7acfa2009-02-28 21:56:50 +00002820 if (NewVD->isFileVarDecl())
2821 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope);
2822 else
2823 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage);
Chris Lattnereaaebc72009-04-25 08:06:05 +00002824 return NewVD->setInvalidDecl();
Anders Carlsson1a7acfa2009-02-28 21:56:50 +00002825 }
Mike Stump1eb44332009-09-09 15:08:12 +00002826
Chris Lattnereaaebc72009-04-25 08:06:05 +00002827 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size);
2828 NewVD->setType(FixedTy);
Anders Carlsson1a7acfa2009-02-28 21:56:50 +00002829 }
2830
John McCall68263142009-11-18 22:49:29 +00002831 if (Previous.empty() && NewVD->isExternC()) {
Douglas Gregor63935192009-03-02 00:19:53 +00002832 // Since we did not find anything by this name and we're declaring
2833 // an extern "C" variable, look for a non-visible extern "C"
2834 // declaration with the same name.
2835 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002836 = LocallyScopedExternalDecls.find(NewVD->getDeclName());
Douglas Gregor63935192009-03-02 00:19:53 +00002837 if (Pos != LocallyScopedExternalDecls.end())
John McCall68263142009-11-18 22:49:29 +00002838 Previous.addDecl(Pos->second);
Douglas Gregor63935192009-03-02 00:19:53 +00002839 }
2840
Chris Lattnereaaebc72009-04-25 08:06:05 +00002841 if (T->isVoidType() && !NewVD->hasExternalStorage()) {
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002842 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type)
2843 << T;
Chris Lattnereaaebc72009-04-25 08:06:05 +00002844 return NewVD->setInvalidDecl();
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002845 }
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00002846
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00002847 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) {
Mike Stumpea000bf2009-04-30 00:19:40 +00002848 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal);
2849 return NewVD->setInvalidDecl();
2850 }
Mike Stump1eb44332009-09-09 15:08:12 +00002851
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00002852 if (isVM && NewVD->hasAttr<BlocksAttr>()) {
Mike Stumpc975bb02009-05-01 23:41:47 +00002853 Diag(NewVD->getLocation(), diag::err_block_on_vm);
2854 return NewVD->setInvalidDecl();
2855 }
2856
John McCall68263142009-11-18 22:49:29 +00002857 if (!Previous.empty()) {
Douglas Gregorcda9c672009-02-16 17:45:42 +00002858 Redeclaration = true;
John McCall68263142009-11-18 22:49:29 +00002859 MergeVarDecl(NewVD, Previous);
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00002860 }
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00002861}
2862
Douglas Gregora8f32e02009-10-06 17:59:45 +00002863/// \brief Data used with FindOverriddenMethod
2864struct FindOverriddenMethodData {
2865 Sema *S;
2866 CXXMethodDecl *Method;
2867};
2868
2869/// \brief Member lookup function that determines whether a given C++
2870/// method overrides a method in a base class, to be used with
2871/// CXXRecordDecl::lookupInBases().
John McCallaf8e6ed2009-11-12 03:15:40 +00002872static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier,
Douglas Gregora8f32e02009-10-06 17:59:45 +00002873 CXXBasePath &Path,
2874 void *UserData) {
2875 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl();
Anders Carlsson95496802009-11-26 20:50:40 +00002876
Douglas Gregora8f32e02009-10-06 17:59:45 +00002877 FindOverriddenMethodData *Data
2878 = reinterpret_cast<FindOverriddenMethodData*>(UserData);
Anders Carlsson95496802009-11-26 20:50:40 +00002879
2880 DeclarationName Name = Data->Method->getDeclName();
2881
2882 // FIXME: Do we care about other names here too?
2883 if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
John McCallad00b772010-06-16 08:42:20 +00002884 // We really want to find the base class destructor here.
Anders Carlsson95496802009-11-26 20:50:40 +00002885 QualType T = Data->S->Context.getTypeDeclType(BaseRecord);
2886 CanQualType CT = Data->S->Context.getCanonicalType(T);
2887
Anders Carlsson1a689722009-11-27 01:26:58 +00002888 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT);
Anders Carlsson95496802009-11-26 20:50:40 +00002889 }
2890
2891 for (Path.Decls = BaseRecord->lookup(Name);
Douglas Gregora8f32e02009-10-06 17:59:45 +00002892 Path.Decls.first != Path.Decls.second;
2893 ++Path.Decls.first) {
John McCall52a02752010-06-16 09:33:39 +00002894 NamedDecl *D = *Path.Decls.first;
John McCallad00b772010-06-16 08:42:20 +00002895 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) {
2896 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false))
Douglas Gregora8f32e02009-10-06 17:59:45 +00002897 return true;
2898 }
2899 }
2900
2901 return false;
2902}
2903
Sebastian Redla165da02009-11-18 21:51:29 +00002904/// AddOverriddenMethods - See if a method overrides any in the base classes,
2905/// and if so, check that it's a valid override and remember it.
2906void Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) {
2907 // Look for virtual methods in base classes that this method might override.
2908 CXXBasePaths Paths;
2909 FindOverriddenMethodData Data;
2910 Data.Method = MD;
2911 Data.S = this;
2912 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) {
2913 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(),
2914 E = Paths.found_decls_end(); I != E; ++I) {
2915 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) {
2916 if (!CheckOverridingFunctionReturnType(MD, OldMD) &&
Sean Huntbbd37c62009-11-21 08:43:09 +00002917 !CheckOverridingFunctionExceptionSpec(MD, OldMD) &&
2918 !CheckOverridingFunctionAttributes(MD, OldMD))
Anders Carlsson3aaf4862009-12-04 05:51:56 +00002919 MD->addOverriddenMethod(OldMD->getCanonicalDecl());
Sebastian Redla165da02009-11-18 21:51:29 +00002920 }
2921 }
2922 }
2923}
2924
Mike Stump1eb44332009-09-09 15:08:12 +00002925NamedDecl*
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00002926Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC,
John McCalla93c9342009-12-07 02:54:59 +00002927 QualType R, TypeSourceInfo *TInfo,
John McCall68263142009-11-18 22:49:29 +00002928 LookupResult &Previous,
Douglas Gregore542c862009-06-23 23:11:28 +00002929 MultiTemplateParamsArg TemplateParamLists,
Chris Lattnereaaebc72009-04-25 08:06:05 +00002930 bool IsFunctionDefinition, bool &Redeclaration) {
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00002931 assert(R.getTypePtr()->isFunctionType());
2932
2933 DeclarationName Name = GetNameForDeclarator(D);
2934 FunctionDecl::StorageClass SC = FunctionDecl::None;
2935 switch (D.getDeclSpec().getStorageClassSpec()) {
2936 default: assert(0 && "Unknown storage class!");
2937 case DeclSpec::SCS_auto:
2938 case DeclSpec::SCS_register:
2939 case DeclSpec::SCS_mutable:
Mike Stump1eb44332009-09-09 15:08:12 +00002940 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
Douglas Gregor04495c82009-02-24 01:23:02 +00002941 diag::err_typecheck_sclass_func);
Chris Lattnereaaebc72009-04-25 08:06:05 +00002942 D.setInvalidType();
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00002943 break;
2944 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break;
2945 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break;
Douglas Gregor04495c82009-02-24 01:23:02 +00002946 case DeclSpec::SCS_static: {
Douglas Gregor656de632009-03-11 23:52:16 +00002947 if (CurContext->getLookupContext()->isFunctionOrMethod()) {
Douglas Gregor04495c82009-02-24 01:23:02 +00002948 // C99 6.7.1p5:
2949 // The declaration of an identifier for a function that has
2950 // block scope shall have no explicit storage-class specifier
2951 // other than extern
2952 // See also (C++ [dcl.stc]p4).
Mike Stump1eb44332009-09-09 15:08:12 +00002953 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
Douglas Gregor04495c82009-02-24 01:23:02 +00002954 diag::err_static_block_func);
2955 SC = FunctionDecl::None;
2956 } else
Mike Stump1eb44332009-09-09 15:08:12 +00002957 SC = FunctionDecl::Static;
Douglas Gregor04495c82009-02-24 01:23:02 +00002958 break;
2959 }
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00002960 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break;
2961 }
2962
Eli Friedman63054b32009-04-19 20:27:55 +00002963 if (D.getDeclSpec().isThreadSpecified())
2964 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
2965
John McCall3f9a8a62009-08-11 06:59:38 +00002966 bool isFriend = D.getDeclSpec().isFriendSpecified();
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00002967 bool isInline = D.getDeclSpec().isInlineSpecified();
Douglas Gregor021c3b32009-03-11 23:00:04 +00002968 bool isVirtual = D.getDeclSpec().isVirtualSpecified();
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00002969 bool isExplicit = D.getDeclSpec().isExplicitSpecified();
2970
Douglas Gregor16573fa2010-04-19 22:54:31 +00002971 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten();
2972 FunctionDecl::StorageClass SCAsWritten
Abramo Bagnarab21b4052010-04-28 13:11:54 +00002973 = StorageClassSpecToFunctionDeclStorageClass(SCSpec, DC);
Douglas Gregor16573fa2010-04-19 22:54:31 +00002974
Anders Carlsson4681ebd2009-03-22 20:18:17 +00002975 // Check that the return type is not an abstract class type.
Anders Carlsson8211eff2009-03-24 01:19:16 +00002976 // For record types, this is done by the AbstractClassUsageDiagnoser once
Mike Stump1eb44332009-09-09 15:08:12 +00002977 // the class has been completely parsed.
Anders Carlsson8211eff2009-03-24 01:19:16 +00002978 if (!DC->isRecord() &&
Mike Stump1eb44332009-09-09 15:08:12 +00002979 RequireNonAbstractType(D.getIdentifierLoc(),
John McCall183700f2009-09-21 23:43:11 +00002980 R->getAs<FunctionType>()->getResultType(),
Mike Stump1eb44332009-09-09 15:08:12 +00002981 diag::err_abstract_type_in_decl,
Anders Carlsson8211eff2009-03-24 01:19:16 +00002982 AbstractReturnType))
Chris Lattnereaaebc72009-04-25 08:06:05 +00002983 D.setInvalidType();
Mike Stump1eb44332009-09-09 15:08:12 +00002984
Chris Lattnerbb749822009-04-11 19:17:25 +00002985 // Do not allow returning a objc interface by-value.
John McCallc12c5bb2010-05-15 11:32:37 +00002986 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) {
Chris Lattnerbb749822009-04-11 19:17:25 +00002987 Diag(D.getIdentifierLoc(),
2988 diag::err_object_cannot_be_passed_returned_by_value) << 0
John McCall183700f2009-09-21 23:43:11 +00002989 << R->getAs<FunctionType>()->getResultType();
Chris Lattnereaaebc72009-04-25 08:06:05 +00002990 D.setInvalidType();
Chris Lattnerbb749822009-04-11 19:17:25 +00002991 }
Douglas Gregore542c862009-06-23 23:11:28 +00002992
Douglas Gregor021c3b32009-03-11 23:00:04 +00002993 bool isVirtualOkay = false;
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00002994 FunctionDecl *NewFD;
John McCall02cace72009-08-28 07:59:38 +00002995
John McCall3f9a8a62009-08-11 06:59:38 +00002996 if (isFriend) {
John McCall3f9a8a62009-08-11 06:59:38 +00002997 // C++ [class.friend]p5
2998 // A function can be defined in a friend declaration of a
2999 // class . . . . Such a function is implicitly inline.
3000 isInline |= IsFunctionDefinition;
John McCall02cace72009-08-28 07:59:38 +00003001 }
John McCall3f9a8a62009-08-11 06:59:38 +00003002
Douglas Gregor3f9a0562009-11-03 01:35:08 +00003003 if (Name.getNameKind() == DeclarationName::CXXConstructorName) {
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003004 // This is a C++ constructor declaration.
3005 assert(DC->isRecord() &&
3006 "Constructors can only be declared in a member context");
3007
Chris Lattner65401802009-04-25 08:28:21 +00003008 R = CheckConstructorDeclarator(D, R, SC);
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003009
3010 // Create the new declaration
Mike Stump1eb44332009-09-09 15:08:12 +00003011 NewFD = CXXConstructorDecl::Create(Context,
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003012 cast<CXXRecordDecl>(DC),
John McCalla93c9342009-12-07 02:54:59 +00003013 D.getIdentifierLoc(), Name, R, TInfo,
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003014 isExplicit, isInline,
3015 /*isImplicitlyDeclared=*/false);
Douglas Gregor3f9a0562009-11-03 01:35:08 +00003016 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003017 // This is a C++ destructor declaration.
3018 if (DC->isRecord()) {
Chris Lattner65401802009-04-25 08:28:21 +00003019 R = CheckDestructorDeclarator(D, SC);
Mike Stump1eb44332009-09-09 15:08:12 +00003020
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003021 NewFD = CXXDestructorDecl::Create(Context,
3022 cast<CXXRecordDecl>(DC),
Mike Stump1eb44332009-09-09 15:08:12 +00003023 D.getIdentifierLoc(), Name, R,
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003024 isInline,
3025 /*isImplicitlyDeclared=*/false);
John McCall21ef0fa2010-03-11 09:03:00 +00003026 NewFD->setTypeSourceInfo(TInfo);
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003027
Douglas Gregor021c3b32009-03-11 23:00:04 +00003028 isVirtualOkay = true;
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003029 } else {
3030 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member);
3031
3032 // Create a FunctionDecl to satisfy the function definition parsing
3033 // code path.
3034 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(),
Douglas Gregor16573fa2010-04-19 22:54:31 +00003035 Name, R, TInfo, SC, SCAsWritten, isInline,
Argyrios Kyrtzidisa5d82002009-08-21 00:31:54 +00003036 /*hasPrototype=*/true);
Chris Lattnereaaebc72009-04-25 08:06:05 +00003037 D.setInvalidType();
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003038 }
Douglas Gregor3f9a0562009-11-03 01:35:08 +00003039 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) {
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003040 if (!DC->isRecord()) {
3041 Diag(D.getIdentifierLoc(),
3042 diag::err_conv_function_not_member);
3043 return 0;
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003044 }
Mike Stump1eb44332009-09-09 15:08:12 +00003045
Chris Lattner6e475012009-04-25 08:35:12 +00003046 CheckConversionDeclarator(D, R, SC);
3047 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC),
John McCalla93c9342009-12-07 02:54:59 +00003048 D.getIdentifierLoc(), Name, R, TInfo,
Chris Lattner6e475012009-04-25 08:35:12 +00003049 isInline, isExplicit);
Mike Stump1eb44332009-09-09 15:08:12 +00003050
Chris Lattner6e475012009-04-25 08:35:12 +00003051 isVirtualOkay = true;
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003052 } else if (DC->isRecord()) {
Anders Carlsson4649cac2009-04-30 22:41:11 +00003053 // If the of the function is the same as the name of the record, then this
Mike Stump1eb44332009-09-09 15:08:12 +00003054 // must be an invalid constructor that has a return type.
3055 // (The parser checks for a return type and makes the declarator a
Anders Carlsson4649cac2009-04-30 22:41:11 +00003056 // constructor if it has no return type).
Mike Stump1eb44332009-09-09 15:08:12 +00003057 // must have an invalid constructor that has a return type
Douglas Gregor6f7a17b2010-02-05 06:12:42 +00003058 if (Name.getAsIdentifierInfo() &&
3059 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){
Anders Carlsson4649cac2009-04-30 22:41:11 +00003060 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type)
3061 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
3062 << SourceRange(D.getIdentifierLoc());
3063 return 0;
3064 }
Mike Stump1eb44332009-09-09 15:08:12 +00003065
Anders Carlsson67bf2e72009-11-15 18:59:32 +00003066 bool isStatic = SC == FunctionDecl::Static;
3067
3068 // [class.free]p1:
3069 // Any allocation function for a class T is a static member
3070 // (even if not explicitly declared static).
3071 if (Name.getCXXOverloadedOperator() == OO_New ||
3072 Name.getCXXOverloadedOperator() == OO_Array_New)
3073 isStatic = true;
Anders Carlsson1f126bd2009-11-15 19:08:46 +00003074
3075 // [class.free]p6 Any deallocation function for a class X is a static member
3076 // (even if not explicitly declared static).
3077 if (Name.getCXXOverloadedOperator() == OO_Delete ||
3078 Name.getCXXOverloadedOperator() == OO_Array_Delete)
3079 isStatic = true;
Anders Carlsson67bf2e72009-11-15 18:59:32 +00003080
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003081 // This is a C++ method declaration.
3082 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC),
John McCalla93c9342009-12-07 02:54:59 +00003083 D.getIdentifierLoc(), Name, R, TInfo,
Douglas Gregor16573fa2010-04-19 22:54:31 +00003084 isStatic, SCAsWritten, isInline);
Douglas Gregor021c3b32009-03-11 23:00:04 +00003085
Anders Carlsson1f126bd2009-11-15 19:08:46 +00003086 isVirtualOkay = !isStatic;
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003087 } else {
Douglas Gregord874def2009-03-19 18:33:54 +00003088 // Determine whether the function was written with a
3089 // prototype. This true when:
3090 // - we're in C++ (where every function has a prototype),
3091 // - there is a prototype in the declarator, or
3092 // - the type R of the function is some kind of typedef or other reference
3093 // to a type name (which eventually refers to a function type).
Mike Stump1eb44332009-09-09 15:08:12 +00003094 bool HasPrototype =
Chris Lattner0d48bf92009-03-17 23:17:04 +00003095 getLangOptions().CPlusPlus ||
Douglas Gregor13d7a322009-03-19 18:14:46 +00003096 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) ||
Douglas Gregord1659a62009-03-23 16:26:51 +00003097 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType());
Mike Stump1eb44332009-09-09 15:08:12 +00003098
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003099 NewFD = FunctionDecl::Create(Context, DC,
3100 D.getIdentifierLoc(),
Douglas Gregor16573fa2010-04-19 22:54:31 +00003101 Name, R, TInfo, SC, SCAsWritten, isInline,
3102 HasPrototype);
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003103 }
3104
Chris Lattnereaaebc72009-04-25 08:06:05 +00003105 if (D.isInvalidType())
Chris Lattner584be452009-04-25 05:44:12 +00003106 NewFD->setInvalidDecl();
Mike Stump1eb44332009-09-09 15:08:12 +00003107
John McCallb6217662010-03-15 10:12:16 +00003108 SetNestedNameSpecifier(NewFD, D);
3109
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003110 // Set the lexical context. If the declarator has a C++
John McCall02cace72009-08-28 07:59:38 +00003111 // scope specifier, or is the object of a friend declaration, the
3112 // lexical context will be different from the semantic context.
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003113 NewFD->setLexicalDeclContext(CurContext);
3114
Douglas Gregorf59a56e2009-07-21 23:53:31 +00003115 // Match up the template parameter lists with the scope specifier, then
3116 // determine whether we have a template or a template specialization.
Douglas Gregorc5c903a2009-06-24 00:23:40 +00003117 FunctionTemplateDecl *FunctionTemplate = 0;
Douglas Gregor1fef4e62009-10-07 22:35:40 +00003118 bool isExplicitSpecialization = false;
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00003119 bool isFunctionTemplateSpecialization = false;
Abramo Bagnara9b934882010-06-12 08:15:14 +00003120 unsigned NumMatchedTemplateParamLists = TemplateParamLists.size();
Douglas Gregorf59a56e2009-07-21 23:53:31 +00003121 if (TemplateParameterList *TemplateParams
3122 = MatchTemplateParametersToScopeSpecifier(
3123 D.getDeclSpec().getSourceRange().getBegin(),
3124 D.getCXXScopeSpec(),
Douglas Gregor27eeb5e2009-07-22 22:05:02 +00003125 (TemplateParameterList**)TemplateParamLists.get(),
Douglas Gregor1fef4e62009-10-07 22:35:40 +00003126 TemplateParamLists.size(),
John McCall77e8b112010-04-13 20:37:33 +00003127 isFriend,
Douglas Gregor1fef4e62009-10-07 22:35:40 +00003128 isExplicitSpecialization)) {
Abramo Bagnara9b934882010-06-12 08:15:14 +00003129 // All but one template parameter lists have been matching.
3130 --NumMatchedTemplateParamLists;
3131
Douglas Gregorc5c903a2009-06-24 00:23:40 +00003132 if (TemplateParams->size() > 0) {
3133 // This is a function template
Mike Stump1eb44332009-09-09 15:08:12 +00003134
Douglas Gregor05396e22009-08-25 17:23:04 +00003135 // Check that we can declare a template here.
3136 if (CheckTemplateDeclScope(S, TemplateParams))
3137 return 0;
Mike Stump1eb44332009-09-09 15:08:12 +00003138
Douglas Gregord60e1052009-08-27 16:57:43 +00003139 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC,
Douglas Gregorc5c903a2009-06-24 00:23:40 +00003140 NewFD->getLocation(),
3141 Name, TemplateParams,
3142 NewFD);
Douglas Gregord60e1052009-08-27 16:57:43 +00003143 FunctionTemplate->setLexicalDeclContext(CurContext);
Douglas Gregorc5c903a2009-06-24 00:23:40 +00003144 NewFD->setDescribedFunctionTemplate(FunctionTemplate);
3145 } else {
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00003146 // This is a function template specialization.
3147 isFunctionTemplateSpecialization = true;
John McCall7ad650f2010-03-24 07:46:06 +00003148
John McCallaf2094e2010-04-08 09:05:18 +00003149 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);".
John McCall7ad650f2010-03-24 07:46:06 +00003150 if (isFriend && isFunctionTemplateSpecialization) {
John McCall5fd378b2010-03-24 08:27:58 +00003151 // We want to remove the "template<>", found here.
3152 SourceRange RemoveRange = TemplateParams->getSourceRange();
3153
3154 // If we remove the template<> and the name is not a
3155 // template-id, we're actually silently creating a problem:
3156 // the friend declaration will refer to an untemplated decl,
3157 // and clearly the user wants a template specialization. So
3158 // we need to insert '<>' after the name.
3159 SourceLocation InsertLoc;
3160 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) {
3161 InsertLoc = D.getName().getSourceRange().getEnd();
3162 InsertLoc = PP.getLocForEndOfToken(InsertLoc);
3163 }
3164
John McCall7ad650f2010-03-24 07:46:06 +00003165 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend)
John McCall5fd378b2010-03-24 08:27:58 +00003166 << Name << RemoveRange
Douglas Gregor849b2432010-03-31 17:46:05 +00003167 << FixItHint::CreateRemoval(RemoveRange)
3168 << FixItHint::CreateInsertion(InsertLoc, "<>");
John McCall7ad650f2010-03-24 07:46:06 +00003169 }
Douglas Gregorc5c903a2009-06-24 00:23:40 +00003170 }
Mike Stump1eb44332009-09-09 15:08:12 +00003171 }
Abramo Bagnara9b934882010-06-12 08:15:14 +00003172
3173 if (NumMatchedTemplateParamLists > 0) {
Douglas Gregorc722ea42010-06-15 17:44:38 +00003174 NewFD->setTemplateParameterListsInfo(Context,
3175 NumMatchedTemplateParamLists,
Abramo Bagnara9b934882010-06-12 08:15:14 +00003176 (TemplateParameterList**)TemplateParamLists.release());
3177 }
3178
Douglas Gregor021c3b32009-03-11 23:00:04 +00003179 // C++ [dcl.fct.spec]p5:
3180 // The virtual specifier shall only be used in declarations of
3181 // nonstatic class member functions that appear within a
3182 // member-specification of a class declaration; see 10.3.
3183 //
Chris Lattnereaaebc72009-04-25 08:06:05 +00003184 if (isVirtual && !NewFD->isInvalidDecl()) {
Douglas Gregor021c3b32009-03-11 23:00:04 +00003185 if (!isVirtualOkay) {
Mike Stump1eb44332009-09-09 15:08:12 +00003186 Diag(D.getDeclSpec().getVirtualSpecLoc(),
Douglas Gregor021c3b32009-03-11 23:00:04 +00003187 diag::err_virtual_non_function);
3188 } else if (!CurContext->isRecord()) {
3189 // 'virtual' was specified outside of the class.
3190 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class)
Douglas Gregor849b2432010-03-31 17:46:05 +00003191 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc());
Douglas Gregor021c3b32009-03-11 23:00:04 +00003192 } else {
3193 // Okay: Add virtual to the method.
Douglas Gregor021c3b32009-03-11 23:00:04 +00003194 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC);
Fariborz Jahaniane7184df2009-12-03 18:44:40 +00003195 CurClass->setMethodAsVirtual(NewFD);
Douglas Gregor021c3b32009-03-11 23:00:04 +00003196 }
3197 }
3198
Anders Carlsson0757c8c2010-01-24 16:49:46 +00003199 // C++ [dcl.fct.spec]p6:
3200 // The explicit specifier shall be used only in the declaration of a
3201 // constructor or conversion function within its class definition; see 12.3.1
3202 // and 12.3.2.
3203 if (isExplicit && !NewFD->isInvalidDecl()) {
3204 if (!CurContext->isRecord()) {
3205 // 'explicit' was specified outside of the class.
3206 Diag(D.getDeclSpec().getExplicitSpecLoc(),
3207 diag::err_explicit_out_of_class)
Douglas Gregor849b2432010-03-31 17:46:05 +00003208 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc());
Anders Carlsson0757c8c2010-01-24 16:49:46 +00003209 } else if (!isa<CXXConstructorDecl>(NewFD) &&
3210 !isa<CXXConversionDecl>(NewFD)) {
3211 // 'explicit' was specified on a function that wasn't a constructor
3212 // or conversion function.
3213 Diag(D.getDeclSpec().getExplicitSpecLoc(),
3214 diag::err_explicit_non_ctor_or_conv_function)
Douglas Gregor849b2432010-03-31 17:46:05 +00003215 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc());
Anders Carlsson0757c8c2010-01-24 16:49:46 +00003216 }
3217 }
3218
John McCall68263142009-11-18 22:49:29 +00003219 // Filter out previous declarations that don't match the scope.
3220 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage());
3221
Douglas Gregora735b202009-10-13 14:39:41 +00003222 if (isFriend) {
John McCall68263142009-11-18 22:49:29 +00003223 // DC is the namespace in which the function is being declared.
3224 assert((DC->isFileContext() || !Previous.empty()) &&
3225 "previously-undeclared friend function being created "
3226 "in a non-namespace context");
3227
John McCallb0cb0222010-03-27 05:57:59 +00003228 // For now, claim that the objects have no previous declaration.
Douglas Gregora735b202009-10-13 14:39:41 +00003229 if (FunctionTemplate) {
John McCallb0cb0222010-03-27 05:57:59 +00003230 FunctionTemplate->setObjectOfFriendDecl(false);
Douglas Gregora735b202009-10-13 14:39:41 +00003231 FunctionTemplate->setAccess(AS_public);
3232 }
John McCall77e8b112010-04-13 20:37:33 +00003233 NewFD->setObjectOfFriendDecl(false);
Douglas Gregora735b202009-10-13 14:39:41 +00003234 NewFD->setAccess(AS_public);
3235 }
3236
Mike Stump1eb44332009-09-09 15:08:12 +00003237 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) &&
Douglas Gregor656de632009-03-11 23:52:16 +00003238 !CurContext->isRecord()) {
3239 // C++ [class.static]p1:
3240 // A data or function member of a class may be declared static
3241 // in a class definition, in which case it is a static member of
3242 // the class.
3243
3244 // Complain about the 'static' specifier if it's on an out-of-line
3245 // member function definition.
Mike Stump1eb44332009-09-09 15:08:12 +00003246 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
Douglas Gregor656de632009-03-11 23:52:16 +00003247 diag::err_static_out_of_line)
Douglas Gregor849b2432010-03-31 17:46:05 +00003248 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
Douglas Gregor656de632009-03-11 23:52:16 +00003249 }
3250
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003251 // Handle GNU asm-label extension (encoded as an attribute).
3252 if (Expr *E = (Expr*) D.getAsmLabel()) {
3253 // The parser guarantees this is a string.
Mike Stump1eb44332009-09-09 15:08:12 +00003254 StringLiteral *SE = cast<StringLiteral>(E);
Ted Kremenek3d2c43e2010-02-11 05:28:37 +00003255 NewFD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getString()));
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003256 }
3257
Chris Lattner2dbd2852009-04-25 06:12:16 +00003258 // Copy the parameter declarations from the declarator D to the function
3259 // declaration NewFD, if they are available. First scavenge them into Params.
3260 llvm::SmallVector<ParmVarDecl*, 16> Params;
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003261 if (D.getNumTypeObjects() > 0) {
3262 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun;
3263
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003264 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs
3265 // function that takes no arguments, not a function that takes a
3266 // single void argument.
3267 // We let through "const void" here because Sema::GetTypeForDeclarator
3268 // already checks for that case.
3269 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 &&
3270 FTI.ArgInfo[0].Param &&
Chris Lattnerb28317a2009-03-28 19:18:32 +00003271 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) {
Chris Lattner2dbd2852009-04-25 06:12:16 +00003272 // Empty arg list, don't push any params.
Chris Lattnerb28317a2009-03-28 19:18:32 +00003273 ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>();
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003274
3275 // In C++, the empty parameter-type-list must be spelled "void"; a
3276 // typedef of void is not permitted.
3277 if (getLangOptions().CPlusPlus &&
Chris Lattner584be452009-04-25 05:44:12 +00003278 Param->getType().getUnqualifiedType() != Context.VoidTy)
Douglas Gregora3a83512009-04-01 23:51:29 +00003279 Diag(Param->getLocation(), diag::err_param_typedef_of_void);
Chris Lattner2dbd2852009-04-25 06:12:16 +00003280 // FIXME: Leaks decl?
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003281 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) {
Argyrios Kyrtzidis9bedef62009-07-14 03:18:53 +00003282 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) {
3283 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>();
3284 assert(Param->getDeclContext() != NewFD && "Was set before ?");
3285 Param->setDeclContext(NewFD);
3286 Params.push_back(Param);
John McCallf19de1c2010-04-14 01:27:20 +00003287
3288 if (Param->isInvalidDecl())
3289 NewFD->setInvalidDecl();
Argyrios Kyrtzidis9bedef62009-07-14 03:18:53 +00003290 }
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003291 }
Mike Stump1eb44332009-09-09 15:08:12 +00003292
John McCall183700f2009-09-21 23:43:11 +00003293 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) {
Chris Lattner1ad9b282009-04-25 06:03:53 +00003294 // When we're declaring a function with a typedef, typeof, etc as in the
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003295 // following example, we'll need to synthesize (unnamed)
3296 // parameters for use in the declaration.
3297 //
3298 // @code
3299 // typedef void fn(int);
3300 // fn f;
3301 // @endcode
Mike Stump1eb44332009-09-09 15:08:12 +00003302
Chris Lattner1ad9b282009-04-25 06:03:53 +00003303 // Synthesize a parameter for each argument type.
Chris Lattner1ad9b282009-04-25 06:03:53 +00003304 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(),
3305 AE = FT->arg_type_end(); AI != AE; ++AI) {
John McCall82dc0092010-06-04 11:21:44 +00003306 ParmVarDecl *Param =
3307 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI);
Chris Lattner1ad9b282009-04-25 06:03:53 +00003308 Params.push_back(Param);
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003309 }
Chris Lattner84bb9442009-04-25 18:38:18 +00003310 } else {
3311 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 &&
3312 "Should not need args for typedef of non-prototype fn");
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003313 }
Chris Lattner2dbd2852009-04-25 06:12:16 +00003314 // Finally, we know we have the right number of parameters, install them.
Douglas Gregor838db382010-02-11 01:19:42 +00003315 NewFD->setParams(Params.data(), Params.size());
Mike Stump1eb44332009-09-09 15:08:12 +00003316
Douglas Gregor0b60d9e2009-09-25 23:53:26 +00003317 // If the declarator is a template-id, translate the parser's template
3318 // argument list into our AST format.
3319 bool HasExplicitTemplateArgs = false;
John McCalld5532b62009-11-23 01:53:49 +00003320 TemplateArgumentListInfo TemplateArgs;
Douglas Gregor3f9a0562009-11-03 01:35:08 +00003321 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) {
3322 TemplateIdAnnotation *TemplateId = D.getName().TemplateId;
John McCalld5532b62009-11-23 01:53:49 +00003323 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc);
3324 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc);
Douglas Gregor0b60d9e2009-09-25 23:53:26 +00003325 ASTTemplateArgsPtr TemplateArgsPtr(*this,
3326 TemplateId->getTemplateArgs(),
Douglas Gregor0b60d9e2009-09-25 23:53:26 +00003327 TemplateId->NumArgs);
3328 translateTemplateArguments(TemplateArgsPtr,
Douglas Gregor0b60d9e2009-09-25 23:53:26 +00003329 TemplateArgs);
3330 TemplateArgsPtr.release();
3331
3332 HasExplicitTemplateArgs = true;
Douglas Gregor0b60d9e2009-09-25 23:53:26 +00003333
3334 if (FunctionTemplate) {
Douglas Gregor1fef4e62009-10-07 22:35:40 +00003335 // FIXME: Diagnose function template with explicit template
Douglas Gregor0b60d9e2009-09-25 23:53:26 +00003336 // arguments.
3337 HasExplicitTemplateArgs = false;
3338 } else if (!isFunctionTemplateSpecialization &&
3339 !D.getDeclSpec().isFriendSpecified()) {
3340 // We have encountered something that the user meant to be a
3341 // specialization (because it has explicitly-specified template
3342 // arguments) but that was not introduced with a "template<>" (or had
3343 // too few of them).
3344 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header)
3345 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc)
Douglas Gregor849b2432010-03-31 17:46:05 +00003346 << FixItHint::CreateInsertion(
Douglas Gregor0b60d9e2009-09-25 23:53:26 +00003347 D.getDeclSpec().getSourceRange().getBegin(),
3348 "template<> ");
3349 isFunctionTemplateSpecialization = true;
John McCall7ad650f2010-03-24 07:46:06 +00003350 } else {
3351 // "friend void foo<>(int);" is an implicit specialization decl.
3352 isFunctionTemplateSpecialization = true;
Douglas Gregor0b60d9e2009-09-25 23:53:26 +00003353 }
John McCallaf2094e2010-04-08 09:05:18 +00003354 } else if (isFriend && isFunctionTemplateSpecialization) {
3355 // This combination is only possible in a recovery case; the user
3356 // wrote something like:
3357 // template <> friend void foo(int);
3358 // which we're recovering from as if the user had written:
3359 // friend void foo<>(int);
3360 // Go ahead and fake up a template id.
3361 HasExplicitTemplateArgs = true;
3362 TemplateArgs.setLAngleLoc(D.getIdentifierLoc());
3363 TemplateArgs.setRAngleLoc(D.getIdentifierLoc());
Douglas Gregor0b60d9e2009-09-25 23:53:26 +00003364 }
John McCall68263142009-11-18 22:49:29 +00003365
John McCallaf2094e2010-04-08 09:05:18 +00003366 // If it's a friend (and only if it's a friend), it's possible
3367 // that either the specialized function type or the specialized
3368 // template is dependent, and therefore matching will fail. In
3369 // this case, don't check the specialization yet.
3370 if (isFunctionTemplateSpecialization && isFriend &&
3371 (NewFD->getType()->isDependentType() || DC->isDependentContext())) {
3372 assert(HasExplicitTemplateArgs &&
3373 "friend function specialization without template args");
3374 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs,
3375 Previous))
Douglas Gregor036ada22010-03-24 17:31:23 +00003376 NewFD->setInvalidDecl();
John McCallaf2094e2010-04-08 09:05:18 +00003377 } else if (isFunctionTemplateSpecialization) {
3378 if (CheckFunctionTemplateSpecialization(NewFD,
3379 (HasExplicitTemplateArgs ? &TemplateArgs : 0),
3380 Previous))
3381 NewFD->setInvalidDecl();
3382 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) {
3383 if (CheckMemberSpecialization(NewFD, Previous))
3384 NewFD->setInvalidDecl();
3385 }
John McCallba9d8532010-04-13 06:39:49 +00003386
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003387 // Perform semantic checking on the function declaration.
3388 bool OverloadableAttrRequired = false; // FIXME: HACK!
John McCall9f54ad42009-12-10 09:41:52 +00003389 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization,
Douglas Gregorfd056bc2009-10-13 16:30:37 +00003390 Redeclaration, /*FIXME:*/OverloadableAttrRequired);
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003391
John McCall68263142009-11-18 22:49:29 +00003392 assert((NewFD->isInvalidDecl() || !Redeclaration ||
3393 Previous.getResultKind() != LookupResult::FoundOverloaded) &&
3394 "previous declaration set still overloaded");
3395
John McCall76d32642010-04-24 01:30:58 +00003396 NamedDecl *PrincipalDecl = (FunctionTemplate
3397 ? cast<NamedDecl>(FunctionTemplate)
3398 : NewFD);
3399
John McCallb0cb0222010-03-27 05:57:59 +00003400 if (isFriend && Redeclaration) {
John McCallba9d8532010-04-13 06:39:49 +00003401 AccessSpecifier Access = AS_public;
3402 if (!NewFD->isInvalidDecl())
3403 Access = NewFD->getPreviousDeclaration()->getAccess();
3404
John McCallb0cb0222010-03-27 05:57:59 +00003405 NewFD->setAccess(Access);
John McCall76d32642010-04-24 01:30:58 +00003406 if (FunctionTemplate) FunctionTemplate->setAccess(Access);
3407
3408 PrincipalDecl->setObjectOfFriendDecl(true);
John McCallb0cb0222010-03-27 05:57:59 +00003409 }
3410
John McCall76d32642010-04-24 01:30:58 +00003411 if (NewFD->isOverloadedOperator() && !DC->isRecord() &&
3412 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary))
3413 PrincipalDecl->setNonMemberOperator();
3414
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00003415 // If we have a function template, check the template parameter
3416 // list. This will check and merge default template arguments.
3417 if (FunctionTemplate) {
3418 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration();
3419 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(),
3420 PrevTemplate? PrevTemplate->getTemplateParameters() : 0,
3421 D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate
3422 : TPC_FunctionTemplate);
3423 }
3424
Chris Lattnereaaebc72009-04-25 08:06:05 +00003425 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) {
John McCall46460a62010-01-20 21:53:11 +00003426 // Fake up an access specifier if it's supposed to be a class member.
John McCall86ff3082010-02-04 22:26:26 +00003427 if (!Redeclaration && isa<CXXRecordDecl>(NewFD->getDeclContext()))
John McCall46460a62010-01-20 21:53:11 +00003428 NewFD->setAccess(AS_public);
3429
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003430 // An out-of-line member function declaration must also be a
3431 // definition (C++ [dcl.meaning]p1).
Douglas Gregor741fab62009-10-08 15:54:21 +00003432 // Note that this is not the case for explicit specializations of
3433 // function templates or member functions of class templates, per
3434 // C++ [temp.expl.spec]p2.
Douglas Gregord85cef52009-09-17 19:51:30 +00003435 if (!IsFunctionDefinition && !isFriend &&
Douglas Gregor37d681852009-10-12 22:27:17 +00003436 !isFunctionTemplateSpecialization && !isExplicitSpecialization) {
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003437 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration)
3438 << D.getCXXScopeSpec().getRange();
Chris Lattnereaaebc72009-04-25 08:06:05 +00003439 NewFD->setInvalidDecl();
Douglas Gregor5d52e472010-01-16 18:09:52 +00003440 } else if (!Redeclaration &&
3441 !(isFriend && CurContext->isDependentContext())) {
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003442 // The user tried to provide an out-of-line definition for a
3443 // function that is a member of a class or namespace, but there
Mike Stump1eb44332009-09-09 15:08:12 +00003444 // was no such member function declared (C++ [class.mfct]p2,
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003445 // C++ [namespace.memdef]p2). For example:
Mike Stump1eb44332009-09-09 15:08:12 +00003446 //
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003447 // class X {
3448 // void f() const;
Mike Stump1eb44332009-09-09 15:08:12 +00003449 // };
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003450 //
3451 // void X::f() { } // ill-formed
3452 //
3453 // Complain about this problem, and attempt to suggest close
3454 // matches (e.g., those that differ only in cv-qualifiers and
3455 // whether the parameter types are references).
3456 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match)
Douglas Gregor3f093272009-10-13 21:16:44 +00003457 << Name << DC << D.getCXXScopeSpec().getRange();
Chris Lattnereaaebc72009-04-25 08:06:05 +00003458 NewFD->setInvalidDecl();
Mike Stump1eb44332009-09-09 15:08:12 +00003459
John McCalla24dc2e2009-11-17 02:14:36 +00003460 LookupResult Prev(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName,
John McCall7d384dd2009-11-18 07:57:50 +00003461 ForRedeclaration);
John McCalla24dc2e2009-11-17 02:14:36 +00003462 LookupQualifiedName(Prev, DC);
Mike Stump1eb44332009-09-09 15:08:12 +00003463 assert(!Prev.isAmbiguous() &&
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003464 "Cannot have an ambiguity in previous-declaration lookup");
3465 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end();
3466 Func != FuncEnd; ++Func) {
3467 if (isa<FunctionDecl>(*Func) &&
3468 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD))
3469 Diag((*Func)->getLocation(), diag::note_member_def_close_match);
3470 }
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003471 }
3472 }
3473
3474 // Handle attributes. We need to have merged decls when handling attributes
3475 // (for example to check for conflicts, etc).
3476 // FIXME: This needs to happen before we merge declarations. Then,
3477 // let attribute merging cope with attribute conflicts.
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00003478 ProcessDeclAttributes(S, NewFD, D);
Ryan Flynn478fbc62009-07-25 22:29:44 +00003479
3480 // attributes declared post-definition are currently ignored
John McCall68263142009-11-18 22:49:29 +00003481 if (Redeclaration && Previous.isSingleResult()) {
3482 const FunctionDecl *Def;
3483 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl());
Ryan Flynn478fbc62009-07-25 22:29:44 +00003484 if (PrevFD && PrevFD->getBody(Def) && D.hasAttributes()) {
3485 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition);
3486 Diag(Def->getLocation(), diag::note_previous_definition);
3487 }
3488 }
3489
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003490 AddKnownFunctionAttributes(NewFD);
3491
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00003492 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) {
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003493 // If a function name is overloadable in C, then every function
3494 // with that name must be marked "overloadable".
3495 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing)
3496 << Redeclaration << NewFD;
John McCall68263142009-11-18 22:49:29 +00003497 if (!Previous.empty())
3498 Diag(Previous.getRepresentativeDecl()->getLocation(),
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003499 diag::note_attribute_overloadable_prev_overload);
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00003500 NewFD->addAttr(::new (Context) OverloadableAttr());
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003501 }
3502
3503 // If this is a locally-scoped extern C function, update the
3504 // map of such names.
Douglas Gregor48a83b52009-09-12 00:17:51 +00003505 if (CurContext->isFunctionOrMethod() && NewFD->isExternC()
Chris Lattnereaaebc72009-04-25 08:06:05 +00003506 && !NewFD->isInvalidDecl())
John McCall68263142009-11-18 22:49:29 +00003507 RegisterLocallyScopedExternCDecl(NewFD, Previous, S);
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003508
Argyrios Kyrtzidis16f19302009-06-25 18:22:24 +00003509 // Set this FunctionDecl's range up to the right paren.
3510 NewFD->setLocEnd(D.getSourceRange().getEnd());
3511
Douglas Gregore53060f2009-06-25 22:08:12 +00003512 if (FunctionTemplate && NewFD->isInvalidDecl())
3513 FunctionTemplate->setInvalidDecl();
Mike Stump1eb44332009-09-09 15:08:12 +00003514
Douglas Gregore53060f2009-06-25 22:08:12 +00003515 if (FunctionTemplate)
3516 return FunctionTemplate;
Mike Stump1eb44332009-09-09 15:08:12 +00003517
Tanya Lattnere6bbc012010-02-12 00:07:30 +00003518
3519 // Keep track of static, non-inlined function definitions that
3520 // have not been used. We will warn later.
3521 // FIXME: Also include static functions declared but not defined.
3522 if (!NewFD->isInvalidDecl() && IsFunctionDefinition
3523 && !NewFD->isInlined() && NewFD->getLinkage() == InternalLinkage
Chris Lattner1a4221c2010-04-09 17:25:05 +00003524 && !NewFD->isUsed() && !NewFD->hasAttr<UnusedAttr>()
3525 && !NewFD->hasAttr<ConstructorAttr>()
3526 && !NewFD->hasAttr<DestructorAttr>())
Tanya Lattnere6bbc012010-02-12 00:07:30 +00003527 UnusedStaticFuncs.push_back(NewFD);
3528
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003529 return NewFD;
3530}
3531
3532/// \brief Perform semantic checking of a new function declaration.
3533///
3534/// Performs semantic analysis of the new function declaration
3535/// NewFD. This routine performs all semantic checking that does not
3536/// require the actual declarator involved in the declaration, and is
3537/// used both for the declaration of functions as they are parsed
3538/// (called via ActOnDeclarator) and for the declaration of functions
3539/// that have been instantiated via C++ template instantiation (called
3540/// via InstantiateDecl).
3541///
Douglas Gregorfd056bc2009-10-13 16:30:37 +00003542/// \param IsExplicitSpecialiation whether this new function declaration is
3543/// an explicit specialization of the previous declaration.
3544///
Chris Lattnereaaebc72009-04-25 08:06:05 +00003545/// This sets NewFD->isInvalidDecl() to true if there was an error.
John McCall9f54ad42009-12-10 09:41:52 +00003546void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD,
John McCall68263142009-11-18 22:49:29 +00003547 LookupResult &Previous,
Douglas Gregorfd056bc2009-10-13 16:30:37 +00003548 bool IsExplicitSpecialization,
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003549 bool &Redeclaration,
3550 bool &OverloadableAttrRequired) {
Chris Lattnereaaebc72009-04-25 08:06:05 +00003551 // If NewFD is already known erroneous, don't do any of this checking.
3552 if (NewFD->isInvalidDecl())
3553 return;
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003554
Eli Friedman88f7b572009-05-16 12:15:55 +00003555 if (NewFD->getResultType()->isVariablyModifiedType()) {
3556 // Functions returning a variably modified type violate C99 6.7.5.2p2
3557 // because all functions have linkage.
3558 Diag(NewFD->getLocation(), diag::err_vm_func_decl);
3559 return NewFD->setInvalidDecl();
3560 }
3561
Douglas Gregor48a83b52009-09-12 00:17:51 +00003562 if (NewFD->isMain())
3563 CheckMain(NewFD);
John McCall8c4859a2009-07-24 03:03:21 +00003564
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003565 // Check for a previous declaration of this name.
John McCall68263142009-11-18 22:49:29 +00003566 if (Previous.empty() && NewFD->isExternC()) {
Douglas Gregor63935192009-03-02 00:19:53 +00003567 // Since we did not find anything by this name and we're declaring
3568 // an extern "C" function, look for a non-visible extern "C"
3569 // declaration with the same name.
3570 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003571 = LocallyScopedExternalDecls.find(NewFD->getDeclName());
Douglas Gregor63935192009-03-02 00:19:53 +00003572 if (Pos != LocallyScopedExternalDecls.end())
John McCall68263142009-11-18 22:49:29 +00003573 Previous.addDecl(Pos->second);
Douglas Gregor63935192009-03-02 00:19:53 +00003574 }
3575
Douglas Gregor04495c82009-02-24 01:23:02 +00003576 // Merge or overload the declaration with an existing declaration of
3577 // the same name, if appropriate.
John McCall68263142009-11-18 22:49:29 +00003578 if (!Previous.empty()) {
Douglas Gregorf9201e02009-02-11 23:02:49 +00003579 // Determine whether NewFD is an overload of PrevDecl or
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003580 // a declaration that requires merging. If it's an overload,
3581 // there's no more work to do here; we'll just add the new
3582 // function to the scope.
Douglas Gregorae170942009-02-13 00:26:38 +00003583
John McCall68263142009-11-18 22:49:29 +00003584 NamedDecl *OldDecl = 0;
John McCall871b2e72009-12-09 03:35:25 +00003585 if (!AllowOverloadingOfFunction(Previous, Context)) {
3586 Redeclaration = true;
3587 OldDecl = Previous.getFoundDecl();
3588 } else {
3589 if (!getLangOptions().CPlusPlus) {
3590 OverloadableAttrRequired = true;
3591
3592 // Functions marked "overloadable" must have a prototype (that
3593 // we can't get through declaration merging).
3594 if (!NewFD->getType()->getAs<FunctionProtoType>()) {
3595 Diag(NewFD->getLocation(),
3596 diag::err_attribute_overloadable_no_prototype)
3597 << NewFD;
John McCall68263142009-11-18 22:49:29 +00003598 Redeclaration = true;
John McCall871b2e72009-12-09 03:35:25 +00003599
3600 // Turn this into a variadic function with no parameters.
3601 QualType R = Context.getFunctionType(
3602 NewFD->getType()->getAs<FunctionType>()->getResultType(),
Rafael Espindola264ba482010-03-30 20:24:48 +00003603 0, 0, true, 0, false, false, 0, 0,
3604 FunctionType::ExtInfo());
John McCall871b2e72009-12-09 03:35:25 +00003605 NewFD->setType(R);
3606 return NewFD->setInvalidDecl();
3607 }
3608 }
3609
John McCallad00b772010-06-16 08:42:20 +00003610 switch (CheckOverload(S, NewFD, Previous, OldDecl,
3611 /*NewIsUsingDecl*/ false)) {
John McCall871b2e72009-12-09 03:35:25 +00003612 case Ovl_Match:
John McCall9f54ad42009-12-10 09:41:52 +00003613 Redeclaration = true;
John McCall871b2e72009-12-09 03:35:25 +00003614 break;
3615
3616 case Ovl_NonFunction:
3617 Redeclaration = true;
3618 break;
3619
3620 case Ovl_Overload:
3621 Redeclaration = false;
3622 break;
John McCall68263142009-11-18 22:49:29 +00003623 }
3624 }
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003625
John McCall68263142009-11-18 22:49:29 +00003626 if (Redeclaration) {
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003627 // NewFD and OldDecl represent declarations that need to be
Mike Stump1eb44332009-09-09 15:08:12 +00003628 // merged.
Douglas Gregorcda9c672009-02-16 17:45:42 +00003629 if (MergeFunctionDecl(NewFD, OldDecl))
Chris Lattnereaaebc72009-04-25 08:06:05 +00003630 return NewFD->setInvalidDecl();
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003631
John McCall68263142009-11-18 22:49:29 +00003632 Previous.clear();
3633 Previous.addDecl(OldDecl);
3634
Douglas Gregore53060f2009-06-25 22:08:12 +00003635 if (FunctionTemplateDecl *OldTemplateDecl
Douglas Gregor37d681852009-10-12 22:27:17 +00003636 = dyn_cast<FunctionTemplateDecl>(OldDecl)) {
Douglas Gregorfd056bc2009-10-13 16:30:37 +00003637 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl());
Douglas Gregor37d681852009-10-12 22:27:17 +00003638 FunctionTemplateDecl *NewTemplateDecl
3639 = NewFD->getDescribedFunctionTemplate();
3640 assert(NewTemplateDecl && "Template/non-template mismatch");
3641 if (CXXMethodDecl *Method
3642 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) {
3643 Method->setAccess(OldTemplateDecl->getAccess());
3644 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess());
3645 }
Douglas Gregorfd056bc2009-10-13 16:30:37 +00003646
3647 // If this is an explicit specialization of a member that is a function
3648 // template, mark it as a member specialization.
3649 if (IsExplicitSpecialization &&
3650 NewTemplateDecl->getInstantiatedFromMemberTemplate()) {
3651 NewTemplateDecl->setMemberSpecialization();
3652 assert(OldTemplateDecl->isMemberSpecialization());
3653 }
Douglas Gregor37d681852009-10-12 22:27:17 +00003654 } else {
Argyrios Kyrtzidis9bedef62009-07-14 03:18:53 +00003655 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions
3656 NewFD->setAccess(OldDecl->getAccess());
Douglas Gregore53060f2009-06-25 22:08:12 +00003657 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl));
Argyrios Kyrtzidis9bedef62009-07-14 03:18:53 +00003658 }
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003659 }
Douglas Gregor4ce205f2009-02-06 17:46:57 +00003660 }
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003661
Anders Carlsson2c59d3c2009-09-13 21:33:06 +00003662 // Semantic checking for this function declaration (in isolation).
3663 if (getLangOptions().CPlusPlus) {
3664 // C++-specific checks.
3665 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) {
3666 CheckConstructor(Constructor);
Anders Carlsson6d701392009-11-15 22:49:34 +00003667 } else if (CXXDestructorDecl *Destructor =
3668 dyn_cast<CXXDestructorDecl>(NewFD)) {
3669 CXXRecordDecl *Record = Destructor->getParent();
Anders Carlsson2c59d3c2009-09-13 21:33:06 +00003670 QualType ClassType = Context.getTypeDeclType(Record);
Anders Carlsson6d701392009-11-15 22:49:34 +00003671
3672 // FIXME: Shouldn't we be able to perform thisc heck even when the class
3673 // type is dependent? Both gcc and edg can handle that.
Anders Carlsson2c59d3c2009-09-13 21:33:06 +00003674 if (!ClassType->isDependentType()) {
3675 DeclarationName Name
3676 = Context.DeclarationNames.getCXXDestructorName(
3677 Context.getCanonicalType(ClassType));
3678 if (NewFD->getDeclName() != Name) {
3679 Diag(NewFD->getLocation(), diag::err_destructor_name);
3680 return NewFD->setInvalidDecl();
3681 }
3682 }
Anders Carlsson6d701392009-11-15 22:49:34 +00003683
Anders Carlsson2c59d3c2009-09-13 21:33:06 +00003684 Record->setUserDeclaredDestructor(true);
3685 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no
3686 // user-defined destructor.
3687 Record->setPOD(false);
3688
3689 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly-
3690 // declared destructor.
3691 // FIXME: C++0x: don't do this for "= default" destructors
3692 Record->setHasTrivialDestructor(false);
3693 } else if (CXXConversionDecl *Conversion
Douglas Gregor4ba31362009-12-01 17:24:26 +00003694 = dyn_cast<CXXConversionDecl>(NewFD)) {
Anders Carlsson2c59d3c2009-09-13 21:33:06 +00003695 ActOnConversionDeclarator(Conversion);
Douglas Gregor4ba31362009-12-01 17:24:26 +00003696 }
3697
3698 // Find any virtual functions that this function overrides.
Douglas Gregore6342c02009-12-01 17:35:23 +00003699 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) {
3700 if (!Method->isFunctionTemplateSpecialization() &&
3701 !Method->getDescribedFunctionTemplate())
3702 AddOverriddenMethods(Method->getParent(), Method);
3703 }
Anders Carlsson2c59d3c2009-09-13 21:33:06 +00003704
Eli Friedman5fcf1f02009-12-02 07:16:50 +00003705 // Additional checks for the destructor; make sure we do this after we
3706 // figure out whether the destructor is virtual.
3707 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(NewFD))
3708 if (!Destructor->getParent()->isDependentType())
3709 CheckDestructor(Destructor);
3710
Anders Carlsson2c59d3c2009-09-13 21:33:06 +00003711 // Extra checking for C++ overloaded operators (C++ [over.oper]).
3712 if (NewFD->isOverloadedOperator() &&
3713 CheckOverloadedOperatorDeclaration(NewFD))
3714 return NewFD->setInvalidDecl();
Sean Hunta6c058d2010-01-13 09:01:02 +00003715
3716 // Extra checking for C++0x literal operators (C++0x [over.literal]).
3717 if (NewFD->getLiteralIdentifier() &&
3718 CheckLiteralOperatorDeclaration(NewFD))
3719 return NewFD->setInvalidDecl();
3720
Anders Carlsson2c59d3c2009-09-13 21:33:06 +00003721 // In C++, check default arguments now that we have merged decls. Unless
3722 // the lexical context is the class, because in this case this is done
3723 // during delayed parsing anyway.
3724 if (!CurContext->isRecord())
3725 CheckCXXDefaultArguments(NewFD);
3726 }
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003727}
3728
John McCall8c4859a2009-07-24 03:03:21 +00003729void Sema::CheckMain(FunctionDecl* FD) {
John McCall13591ed2009-07-25 04:36:53 +00003730 // C++ [basic.start.main]p3: A program that declares main to be inline
3731 // or static is ill-formed.
3732 // C99 6.7.4p4: In a hosted environment, the inline function specifier
3733 // shall not appear in a declaration of main.
3734 // static main is not an error under C99, but we should warn about it.
Douglas Gregor0130f3c2009-10-27 21:01:01 +00003735 bool isInline = FD->isInlineSpecified();
John McCall13591ed2009-07-25 04:36:53 +00003736 bool isStatic = FD->getStorageClass() == FunctionDecl::Static;
3737 if (isInline || isStatic) {
3738 unsigned diagID = diag::warn_unusual_main_decl;
3739 if (isInline || getLangOptions().CPlusPlus)
3740 diagID = diag::err_unusual_main_decl;
3741
3742 int which = isStatic + (isInline << 1) - 1;
3743 Diag(FD->getLocation(), diagID) << which;
3744 }
3745
3746 QualType T = FD->getType();
3747 assert(T->isFunctionType() && "function decl is not of function type");
John McCall183700f2009-09-21 23:43:11 +00003748 const FunctionType* FT = T->getAs<FunctionType>();
Mike Stump1eb44332009-09-09 15:08:12 +00003749
John McCall13591ed2009-07-25 04:36:53 +00003750 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) {
3751 // TODO: add a replacement fixit to turn the return type into 'int'.
3752 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint);
3753 FD->setInvalidDecl(true);
3754 }
3755
3756 // Treat protoless main() as nullary.
3757 if (isa<FunctionNoProtoType>(FT)) return;
3758
3759 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT);
3760 unsigned nparams = FTP->getNumArgs();
3761 assert(FD->getNumParams() == nparams);
3762
John McCall66755862009-12-24 09:58:38 +00003763 bool HasExtraParameters = (nparams > 3);
3764
3765 // Darwin passes an undocumented fourth argument of type char**. If
3766 // other platforms start sprouting these, the logic below will start
3767 // getting shifty.
3768 if (nparams == 4 &&
3769 Context.Target.getTriple().getOS() == llvm::Triple::Darwin)
3770 HasExtraParameters = false;
3771
3772 if (HasExtraParameters) {
John McCall13591ed2009-07-25 04:36:53 +00003773 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams;
3774 FD->setInvalidDecl(true);
3775 nparams = 3;
3776 }
3777
3778 // FIXME: a lot of the following diagnostics would be improved
3779 // if we had some location information about types.
3780
3781 QualType CharPP =
3782 Context.getPointerType(Context.getPointerType(Context.CharTy));
John McCall66755862009-12-24 09:58:38 +00003783 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP };
John McCall13591ed2009-07-25 04:36:53 +00003784
3785 for (unsigned i = 0; i < nparams; ++i) {
3786 QualType AT = FTP->getArgType(i);
3787
3788 bool mismatch = true;
3789
3790 if (Context.hasSameUnqualifiedType(AT, Expected[i]))
3791 mismatch = false;
3792 else if (Expected[i] == CharPP) {
3793 // As an extension, the following forms are okay:
3794 // char const **
3795 // char const * const *
3796 // char * const *
3797
John McCall0953e762009-09-24 19:53:00 +00003798 QualifierCollector qs;
John McCall13591ed2009-07-25 04:36:53 +00003799 const PointerType* PT;
Ted Kremenek6217b802009-07-29 21:53:49 +00003800 if ((PT = qs.strip(AT)->getAs<PointerType>()) &&
3801 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) &&
John McCall13591ed2009-07-25 04:36:53 +00003802 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) {
3803 qs.removeConst();
3804 mismatch = !qs.empty();
3805 }
3806 }
3807
3808 if (mismatch) {
3809 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i];
3810 // TODO: suggest replacing given type with expected type
3811 FD->setInvalidDecl(true);
3812 }
3813 }
3814
3815 if (nparams == 1 && !FD->isInvalidDecl()) {
3816 Diag(FD->getLocation(), diag::warn_main_one_arg);
3817 }
John McCall8c4859a2009-07-24 03:03:21 +00003818}
3819
Eli Friedmanc594b322008-05-20 13:48:25 +00003820bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) {
Eli Friedman3b8a36a2009-02-27 04:17:12 +00003821 // FIXME: Need strict checking. In C89, we need to check for
3822 // any assignment, increment, decrement, function-calls, or
3823 // commas outside of a sizeof. In C99, it's the same list,
3824 // except that the aforementioned are allowed in unevaluated
3825 // expressions. Everything else falls under the
3826 // "may accept other forms of constant expressions" exception.
3827 // (We never end up here for C++, so the constant expression
3828 // rules there don't matter.)
Chris Lattner111c2ee2009-02-24 21:54:33 +00003829 if (Init->isConstantInitializer(Context))
Eli Friedman578a9722009-02-22 06:45:27 +00003830 return false;
Eli Friedman21298282009-02-26 04:47:58 +00003831 Diag(Init->getExprLoc(), diag::err_init_element_not_constant)
3832 << Init->getSourceRange();
Eli Friedmanc594b322008-05-20 13:48:25 +00003833 return true;
Steve Naroffd0091aa2008-01-10 22:15:12 +00003834}
3835
Anders Carlsson9abf2ae2009-08-16 05:13:48 +00003836void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init) {
3837 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false);
Douglas Gregor09f41cf2009-01-14 15:45:31 +00003838}
3839
3840/// AddInitializerToDecl - Adds the initializer Init to the
3841/// declaration dcl. If DirectInit is true, this is C++ direct
3842/// initialization rather than copy initialization.
Chris Lattnerb28317a2009-03-28 19:18:32 +00003843void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) {
3844 Decl *RealDecl = dcl.getAs<Decl>();
Chris Lattner9a11b9a2007-10-19 20:10:30 +00003845 // If there is no declaration, there was an error parsing it. Just ignore
3846 // the initializer.
Eli Friedman3b8a36a2009-02-27 04:17:12 +00003847 if (RealDecl == 0)
Chris Lattner9a11b9a2007-10-19 20:10:30 +00003848 return;
Mike Stump1eb44332009-09-09 15:08:12 +00003849
Douglas Gregor021c3b32009-03-11 23:00:04 +00003850 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) {
3851 // With declarators parsed the way they are, the parser cannot
3852 // distinguish between a normal initializer and a pure-specifier.
3853 // Thus this grotesque test.
3854 IntegerLiteral *IL;
3855 Expr *Init = static_cast<Expr *>(init.get());
3856 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 &&
Douglas Gregor4ba31362009-12-01 17:24:26 +00003857 Context.getCanonicalType(IL->getType()) == Context.IntTy)
3858 CheckPureMethod(Method, Init->getSourceRange());
3859 else {
Douglas Gregor021c3b32009-03-11 23:00:04 +00003860 Diag(Method->getLocation(), diag::err_member_function_initialization)
3861 << Method->getDeclName() << Init->getSourceRange();
3862 Method->setInvalidDecl();
3863 }
3864 return;
3865 }
3866
Steve Naroff410e3e22007-09-12 20:13:48 +00003867 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl);
3868 if (!VDecl) {
Douglas Gregor021c3b32009-03-11 23:00:04 +00003869 if (getLangOptions().CPlusPlus &&
3870 RealDecl->getLexicalDeclContext()->isRecord() &&
3871 isa<NamedDecl>(RealDecl))
3872 Diag(RealDecl->getLocation(), diag::err_member_initialization)
3873 << cast<NamedDecl>(RealDecl)->getDeclName();
3874 else
3875 Diag(RealDecl->getLocation(), diag::err_illegal_initializer);
Steve Naroff410e3e22007-09-12 20:13:48 +00003876 RealDecl->setInvalidDecl();
3877 return;
Eli Friedman3b8a36a2009-02-27 04:17:12 +00003878 }
3879
Eli Friedman49e2b8e2009-11-14 03:40:14 +00003880 // A definition must end up with a complete type, which means it must be
3881 // complete with the restriction that an array type might be completed by the
3882 // initializer; note that later code assumes this restriction.
3883 QualType BaseDeclType = VDecl->getType();
3884 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType))
3885 BaseDeclType = Array->getElementType();
3886 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType,
Eli Friedmana31feca2009-04-13 21:28:54 +00003887 diag::err_typecheck_decl_incomplete_type)) {
3888 RealDecl->setInvalidDecl();
3889 return;
3890 }
3891
Douglas Gregor1ab537b2009-12-03 18:33:45 +00003892 // The variable can not have an abstract class type.
3893 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(),
3894 diag::err_abstract_type_in_decl,
3895 AbstractVariableType))
3896 VDecl->setInvalidDecl();
3897
Sebastian Redl31310a22010-02-01 20:16:42 +00003898 const VarDecl *Def;
3899 if ((Def = VDecl->getDefinition()) && Def != VDecl) {
Mike Stump1eb44332009-09-09 15:08:12 +00003900 Diag(VDecl->getLocation(), diag::err_redefinition)
Douglas Gregor275a3692009-03-10 23:43:53 +00003901 << VDecl->getDeclName();
3902 Diag(Def->getLocation(), diag::note_previous_definition);
3903 VDecl->setInvalidDecl();
3904 return;
3905 }
3906
Eli Friedman3b8a36a2009-02-27 04:17:12 +00003907 // Take ownership of the expression, now that we're sure we have somewhere
3908 // to put it.
Anders Carlssonf1b1d592009-05-01 19:30:39 +00003909 Expr *Init = init.takeAs<Expr>();
Eli Friedman3b8a36a2009-02-27 04:17:12 +00003910 assert(Init && "missing initializer");
3911
Douglas Gregor99a2e602009-12-16 01:38:02 +00003912 // Capture the variable that is being initialized and the style of
3913 // initialization.
3914 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl);
3915
3916 // FIXME: Poor source location information.
3917 InitializationKind Kind
3918 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(),
3919 Init->getLocStart(),
3920 Init->getLocEnd())
3921 : InitializationKind::CreateCopy(VDecl->getLocation(),
3922 Init->getLocStart());
3923
Steve Naroffbb204692007-09-12 14:07:44 +00003924 // Get the decls type and save a reference for later, since
Steve Naroffd0091aa2008-01-10 22:15:12 +00003925 // CheckInitializerTypes may change it.
Steve Naroff410e3e22007-09-12 20:13:48 +00003926 QualType DclT = VDecl->getType(), SavT = DclT;
Steve Naroff248a7532008-04-15 22:42:06 +00003927 if (VDecl->isBlockVarDecl()) {
Daniel Dunbar5466c7b2009-04-14 02:25:56 +00003928 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5
Steve Naroff410e3e22007-09-12 20:13:48 +00003929 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init);
Steve Naroff248a7532008-04-15 22:42:06 +00003930 VDecl->setInvalidDecl();
3931 } else if (!VDecl->isInvalidDecl()) {
Eli Friedmancfdc81a2009-12-19 08:11:05 +00003932 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1);
Eli Friedmana91eb542009-12-22 02:10:53 +00003933 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind,
Eli Friedmancfdc81a2009-12-19 08:11:05 +00003934 MultiExprArg(*this, (void**)&Init, 1),
Eli Friedmana91eb542009-12-22 02:10:53 +00003935 &DclT);
3936 if (Result.isInvalid()) {
Steve Naroff248a7532008-04-15 22:42:06 +00003937 VDecl->setInvalidDecl();
Eli Friedmancfdc81a2009-12-19 08:11:05 +00003938 return;
3939 }
Mike Stump1eb44332009-09-09 15:08:12 +00003940
Eli Friedmana91eb542009-12-22 02:10:53 +00003941 Init = Result.takeAs<Expr>();
3942
Anders Carlssonc5eb7312008-08-22 05:00:02 +00003943 // C++ 3.6.2p2, allow dynamic initialization of static initializers.
Eli Friedmanda153232009-02-20 01:34:21 +00003944 // Don't check invalid declarations to avoid emitting useless diagnostics.
3945 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) {
Daniel Dunbar5466c7b2009-04-14 02:25:56 +00003946 if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4.
Anders Carlssonc5eb7312008-08-22 05:00:02 +00003947 CheckForConstantInitializer(Init, DclT);
3948 }
Steve Naroffbb204692007-09-12 14:07:44 +00003949 }
Mike Stump1eb44332009-09-09 15:08:12 +00003950 } else if (VDecl->isStaticDataMember() &&
Douglas Gregor021c3b32009-03-11 23:00:04 +00003951 VDecl->getLexicalDeclContext()->isRecord()) {
3952 // This is an in-class initialization for a static data member, e.g.,
3953 //
3954 // struct S {
3955 // static const int value = 17;
3956 // };
3957
3958 // Attach the initializer
Douglas Gregor838db382010-02-11 01:19:42 +00003959 VDecl->setInit(Init);
Douglas Gregor021c3b32009-03-11 23:00:04 +00003960
3961 // C++ [class.mem]p4:
3962 // A member-declarator can contain a constant-initializer only
3963 // if it declares a static member (9.4) of const integral or
3964 // const enumeration type, see 9.4.2.
3965 QualType T = VDecl->getType();
Mike Stump1eb44332009-09-09 15:08:12 +00003966 if (!T->isDependentType() &&
Douglas Gregor021c3b32009-03-11 23:00:04 +00003967 (!Context.getCanonicalType(T).isConstQualified() ||
Douglas Gregor2ade35e2010-06-16 00:17:44 +00003968 !T->isIntegralOrEnumerationType())) {
Douglas Gregor021c3b32009-03-11 23:00:04 +00003969 Diag(VDecl->getLocation(), diag::err_member_initialization)
3970 << VDecl->getDeclName() << Init->getSourceRange();
3971 VDecl->setInvalidDecl();
3972 } else {
3973 // C++ [class.static.data]p4:
3974 // If a static data member is of const integral or const
3975 // enumeration type, its declaration in the class definition
3976 // can specify a constant-initializer which shall be an
3977 // integral constant expression (5.19).
3978 if (!Init->isTypeDependent() &&
Douglas Gregor2ade35e2010-06-16 00:17:44 +00003979 !Init->getType()->isIntegralOrEnumerationType()) {
Douglas Gregor021c3b32009-03-11 23:00:04 +00003980 // We have a non-dependent, non-integral or enumeration type.
Mike Stump1eb44332009-09-09 15:08:12 +00003981 Diag(Init->getSourceRange().getBegin(),
Douglas Gregor021c3b32009-03-11 23:00:04 +00003982 diag::err_in_class_initializer_non_integral_type)
3983 << Init->getType() << Init->getSourceRange();
3984 VDecl->setInvalidDecl();
3985 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) {
3986 // Check whether the expression is a constant expression.
3987 llvm::APSInt Value;
3988 SourceLocation Loc;
3989 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) {
3990 Diag(Loc, diag::err_in_class_initializer_non_constant)
3991 << Init->getSourceRange();
3992 VDecl->setInvalidDecl();
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00003993 } else if (!VDecl->getType()->isDependentType())
Eli Friedman73c39ab2009-10-20 08:27:19 +00003994 ImpCastExprToType(Init, VDecl->getType(), CastExpr::CK_IntegralCast);
Douglas Gregor021c3b32009-03-11 23:00:04 +00003995 }
3996 }
Steve Naroff248a7532008-04-15 22:42:06 +00003997 } else if (VDecl->isFileVarDecl()) {
Douglas Gregor41b1d6b2010-04-19 21:31:25 +00003998 if (VDecl->getStorageClass() == VarDecl::Extern &&
Douglas Gregor66dd9392010-04-22 14:36:26 +00003999 (!getLangOptions().CPlusPlus ||
4000 !Context.getBaseElementType(VDecl->getType()).isConstQualified()))
Steve Naroff410e3e22007-09-12 20:13:48 +00004001 Diag(VDecl->getLocation(), diag::warn_extern_init);
Eli Friedmana91eb542009-12-22 02:10:53 +00004002 if (!VDecl->isInvalidDecl()) {
4003 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1);
4004 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind,
4005 MultiExprArg(*this, (void**)&Init, 1),
4006 &DclT);
4007 if (Result.isInvalid()) {
Steve Naroff248a7532008-04-15 22:42:06 +00004008 VDecl->setInvalidDecl();
Eli Friedmana91eb542009-12-22 02:10:53 +00004009 return;
4010 }
4011
4012 Init = Result.takeAs<Expr>();
4013 }
Mike Stump1eb44332009-09-09 15:08:12 +00004014
Anders Carlssonc5eb7312008-08-22 05:00:02 +00004015 // C++ 3.6.2p2, allow dynamic initialization of static initializers.
Eli Friedmanda153232009-02-20 01:34:21 +00004016 // Don't check invalid declarations to avoid emitting useless diagnostics.
4017 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) {
Anders Carlssonc5eb7312008-08-22 05:00:02 +00004018 // C99 6.7.8p4. All file scoped initializers need to be constant.
4019 CheckForConstantInitializer(Init, DclT);
4020 }
Steve Naroffbb204692007-09-12 14:07:44 +00004021 }
4022 // If the type changed, it means we had an incomplete type that was
Mike Stump1eb44332009-09-09 15:08:12 +00004023 // completed by the initializer. For example:
Steve Naroffbb204692007-09-12 14:07:44 +00004024 // int ary[] = { 1, 3, 5 };
4025 // "ary" transitions from a VariableArrayType to a ConstantArrayType.
Christopher Lamb48b12392007-11-29 19:09:19 +00004026 if (!VDecl->isInvalidDecl() && (DclT != SavT)) {
Steve Naroff410e3e22007-09-12 20:13:48 +00004027 VDecl->setType(DclT);
Christopher Lamb48b12392007-11-29 19:09:19 +00004028 Init->setType(DclT);
4029 }
Mike Stump1eb44332009-09-09 15:08:12 +00004030
Anders Carlsson0ece4912009-12-15 20:51:39 +00004031 Init = MaybeCreateCXXExprWithTemporaries(Init);
Steve Naroffbb204692007-09-12 14:07:44 +00004032 // Attach the initializer to the decl.
Douglas Gregor838db382010-02-11 01:19:42 +00004033 VDecl->setInit(Init);
Douglas Gregorb6c8c8b2009-04-21 17:11:58 +00004034
Eli Friedmandd4e4852009-12-20 22:29:11 +00004035 if (getLangOptions().CPlusPlus) {
4036 // Make sure we mark the destructor as used if necessary.
4037 QualType InitType = VDecl->getType();
Douglas Gregorbd6d6192010-01-05 19:06:31 +00004038 while (const ArrayType *Array = Context.getAsArrayType(InitType))
Eli Friedmandd4e4852009-12-20 22:29:11 +00004039 InitType = Context.getBaseElementType(Array);
John McCall68c6c9a2010-02-02 09:10:11 +00004040 if (const RecordType *Record = InitType->getAs<RecordType>())
4041 FinalizeVarWithDestructor(VDecl, Record);
Eli Friedmandd4e4852009-12-20 22:29:11 +00004042 }
4043
Steve Naroffbb204692007-09-12 14:07:44 +00004044 return;
4045}
4046
John McCall7727acf2010-03-31 02:13:20 +00004047/// ActOnInitializerError - Given that there was an error parsing an
4048/// initializer for the given declaration, try to return to some form
4049/// of sanity.
4050void Sema::ActOnInitializerError(DeclPtrTy dcl) {
4051 // Our main concern here is re-establishing invariants like "a
4052 // variable's type is either dependent or complete".
4053 Decl *D = dcl.getAs<Decl>();
4054 if (!D || D->isInvalidDecl()) return;
4055
4056 VarDecl *VD = dyn_cast<VarDecl>(D);
4057 if (!VD) return;
4058
4059 QualType Ty = VD->getType();
4060 if (Ty->isDependentType()) return;
4061
4062 // Require a complete type.
4063 if (RequireCompleteType(VD->getLocation(),
4064 Context.getBaseElementType(Ty),
4065 diag::err_typecheck_decl_incomplete_type)) {
4066 VD->setInvalidDecl();
4067 return;
4068 }
4069
4070 // Require an abstract type.
4071 if (RequireNonAbstractType(VD->getLocation(), Ty,
4072 diag::err_abstract_type_in_decl,
4073 AbstractVariableType)) {
4074 VD->setInvalidDecl();
4075 return;
4076 }
4077
4078 // Don't bother complaining about constructors or destructors,
4079 // though.
4080}
4081
Mike Stump1eb44332009-09-09 15:08:12 +00004082void Sema::ActOnUninitializedDecl(DeclPtrTy dcl,
Anders Carlsson6a75cd92009-07-11 00:34:39 +00004083 bool TypeContainsUndeducedAuto) {
Chris Lattnerb28317a2009-03-28 19:18:32 +00004084 Decl *RealDecl = dcl.getAs<Decl>();
Douglas Gregor27c8dc02008-10-29 00:13:59 +00004085
Argyrios Kyrtzidis48c2e902008-11-07 13:01:22 +00004086 // If there is no declaration, there was an error parsing it. Just ignore it.
4087 if (RealDecl == 0)
4088 return;
4089
Douglas Gregor27c8dc02008-10-29 00:13:59 +00004090 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) {
4091 QualType Type = Var->getType();
Douglas Gregorb6c8c8b2009-04-21 17:11:58 +00004092
Anders Carlsson6a75cd92009-07-11 00:34:39 +00004093 // C++0x [dcl.spec.auto]p3
4094 if (TypeContainsUndeducedAuto) {
4095 Diag(Var->getLocation(), diag::err_auto_var_requires_init)
4096 << Var->getDeclName() << Type;
4097 Var->setInvalidDecl();
4098 return;
4099 }
Mike Stump1eb44332009-09-09 15:08:12 +00004100
Douglas Gregor60c93c92010-02-09 07:26:29 +00004101 switch (Var->isThisDeclarationADefinition()) {
4102 case VarDecl::Definition:
4103 if (!Var->isStaticDataMember() || !Var->getAnyInitializer())
4104 break;
4105
4106 // We have an out-of-line definition of a static data member
4107 // that has an in-class initializer, so we type-check this like
4108 // a declaration.
4109 //
4110 // Fall through
4111
4112 case VarDecl::DeclarationOnly:
4113 // It's only a declaration.
4114
4115 // Block scope. C99 6.7p7: If an identifier for an object is
4116 // declared with no linkage (C99 6.2.2p6), the type for the
4117 // object shall be complete.
4118 if (!Type->isDependentType() && Var->isBlockVarDecl() &&
4119 !Var->getLinkage() && !Var->isInvalidDecl() &&
4120 RequireCompleteType(Var->getLocation(), Type,
4121 diag::err_typecheck_decl_incomplete_type))
4122 Var->setInvalidDecl();
4123
4124 // Make sure that the type is not abstract.
4125 if (!Type->isDependentType() && !Var->isInvalidDecl() &&
4126 RequireNonAbstractType(Var->getLocation(), Type,
4127 diag::err_abstract_type_in_decl,
4128 AbstractVariableType))
4129 Var->setInvalidDecl();
4130 return;
4131
4132 case VarDecl::TentativeDefinition:
4133 // File scope. C99 6.9.2p2: A declaration of an identifier for an
4134 // object that has file scope without an initializer, and without a
4135 // storage-class specifier or with the storage-class specifier "static",
4136 // constitutes a tentative definition. Note: A tentative definition with
4137 // external linkage is valid (C99 6.2.2p5).
4138 if (!Var->isInvalidDecl()) {
4139 if (const IncompleteArrayType *ArrayT
4140 = Context.getAsIncompleteArrayType(Type)) {
4141 if (RequireCompleteType(Var->getLocation(),
4142 ArrayT->getElementType(),
4143 diag::err_illegal_decl_array_incomplete_type))
4144 Var->setInvalidDecl();
4145 } else if (Var->getStorageClass() == VarDecl::Static) {
4146 // C99 6.9.2p3: If the declaration of an identifier for an object is
4147 // a tentative definition and has internal linkage (C99 6.2.2p3), the
4148 // declared type shall not be an incomplete type.
4149 // NOTE: code such as the following
4150 // static struct s;
4151 // struct s { int a; };
4152 // is accepted by gcc. Hence here we issue a warning instead of
4153 // an error and we do not invalidate the static declaration.
4154 // NOTE: to avoid multiple warnings, only check the first declaration.
4155 if (Var->getPreviousDeclaration() == 0)
4156 RequireCompleteType(Var->getLocation(), Type,
4157 diag::ext_typecheck_decl_incomplete_type);
4158 }
4159 }
4160
4161 // Record the tentative definition; we're done.
4162 if (!Var->isInvalidDecl())
4163 TentativeDefinitions.push_back(Var);
4164 return;
4165 }
4166
4167 // Provide a specific diagnostic for uninitialized variable
4168 // definitions with incomplete array type.
4169 if (Type->isIncompleteArrayType()) {
Sebastian Redl6e824752009-11-05 19:47:47 +00004170 Diag(Var->getLocation(),
4171 diag::err_typecheck_incomplete_array_needs_initializer);
4172 Var->setInvalidDecl();
4173 return;
4174 }
4175
Douglas Gregor60c93c92010-02-09 07:26:29 +00004176 // Provide a specific diagnostic for uninitialized variable
4177 // definitions with reference type.
4178 if (Type->isReferenceType()) {
4179 Diag(Var->getLocation(), diag::err_reference_var_requires_init)
4180 << Var->getDeclName()
4181 << SourceRange(Var->getLocation(), Var->getLocation());
4182 Var->setInvalidDecl();
4183 return;
4184 }
4185
4186 // Do not attempt to type-check the default initializer for a
4187 // variable with dependent type.
4188 if (Type->isDependentType())
Douglas Gregor251b4ff2009-10-08 07:24:58 +00004189 return;
Douglas Gregor39da0b82009-09-09 23:08:42 +00004190
Douglas Gregor60c93c92010-02-09 07:26:29 +00004191 if (Var->isInvalidDecl())
4192 return;
Douglas Gregor1ab537b2009-12-03 18:33:45 +00004193
Douglas Gregor60c93c92010-02-09 07:26:29 +00004194 if (RequireCompleteType(Var->getLocation(),
4195 Context.getBaseElementType(Type),
4196 diag::err_typecheck_decl_incomplete_type)) {
4197 Var->setInvalidDecl();
4198 return;
Douglas Gregor18fe5682008-11-03 20:45:27 +00004199 }
Douglas Gregor27c8dc02008-10-29 00:13:59 +00004200
Douglas Gregor60c93c92010-02-09 07:26:29 +00004201 // The variable can not have an abstract class type.
4202 if (RequireNonAbstractType(Var->getLocation(), Type,
4203 diag::err_abstract_type_in_decl,
4204 AbstractVariableType)) {
4205 Var->setInvalidDecl();
4206 return;
4207 }
4208
Douglas Gregor516a6bc2010-03-08 02:45:10 +00004209 const RecordType *Record
4210 = Context.getBaseElementType(Type)->getAs<RecordType>();
4211 if (Record && getLangOptions().CPlusPlus && !getLangOptions().CPlusPlus0x &&
4212 cast<CXXRecordDecl>(Record->getDecl())->isPOD()) {
4213 // C++03 [dcl.init]p9:
4214 // If no initializer is specified for an object, and the
4215 // object is of (possibly cv-qualified) non-POD class type (or
4216 // array thereof), the object shall be default-initialized; if
4217 // the object is of const-qualified type, the underlying class
4218 // type shall have a user-declared default
4219 // constructor. Otherwise, if no initializer is specified for
4220 // a non- static object, the object and its subobjects, if
4221 // any, have an indeterminate initial value); if the object
4222 // or any of its subobjects are of const-qualified type, the
4223 // program is ill-formed.
4224 // FIXME: DPG thinks it is very fishy that C++0x disables this.
4225 } else {
4226 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var);
4227 InitializationKind Kind
4228 = InitializationKind::CreateDefault(Var->getLocation());
Douglas Gregor60c93c92010-02-09 07:26:29 +00004229
Douglas Gregor516a6bc2010-03-08 02:45:10 +00004230 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0);
4231 OwningExprResult Init = InitSeq.Perform(*this, Entity, Kind,
4232 MultiExprArg(*this, 0, 0));
4233 if (Init.isInvalid())
4234 Var->setInvalidDecl();
4235 else if (Init.get())
Douglas Gregor838db382010-02-11 01:19:42 +00004236 Var->setInit(MaybeCreateCXXExprWithTemporaries(Init.takeAs<Expr>()));
Douglas Gregor60c93c92010-02-09 07:26:29 +00004237 }
Douglas Gregor516a6bc2010-03-08 02:45:10 +00004238
4239 if (!Var->isInvalidDecl() && getLangOptions().CPlusPlus && Record)
4240 FinalizeVarWithDestructor(Var, Record);
Douglas Gregor27c8dc02008-10-29 00:13:59 +00004241 }
4242}
4243
Eli Friedmanc1dc6532009-05-29 01:49:24 +00004244Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS,
4245 DeclPtrTy *Group,
Chris Lattner682bf922009-03-29 16:50:03 +00004246 unsigned NumDecls) {
4247 llvm::SmallVector<Decl*, 8> Decls;
Eli Friedmanc1dc6532009-05-29 01:49:24 +00004248
4249 if (DS.isTypeSpecOwned())
4250 Decls.push_back((Decl*)DS.getTypeRep());
4251
Chris Lattner682bf922009-03-29 16:50:03 +00004252 for (unsigned i = 0; i != NumDecls; ++i)
4253 if (Decl *D = Group[i].getAs<Decl>())
4254 Decls.push_back(D);
Mike Stump1eb44332009-09-09 15:08:12 +00004255
Chris Lattner682bf922009-03-29 16:50:03 +00004256 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context,
Jay Foadbeaaccd2009-05-21 09:52:38 +00004257 Decls.data(), Decls.size()));
Reid Spencer5f016e22007-07-11 17:01:13 +00004258}
Steve Naroffe1223f72007-08-28 03:03:08 +00004259
Chris Lattner682bf922009-03-29 16:50:03 +00004260
Chris Lattner04421082008-04-08 04:40:51 +00004261/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator()
4262/// to introduce parameters into function prototype scope.
Mike Stump1eb44332009-09-09 15:08:12 +00004263Sema::DeclPtrTy
Chris Lattner04421082008-04-08 04:40:51 +00004264Sema::ActOnParamDeclarator(Scope *S, Declarator &D) {
Chris Lattner985abd92008-06-26 06:49:43 +00004265 const DeclSpec &DS = D.getDeclSpec();
Douglas Gregor584049d2008-12-15 23:53:10 +00004266
Chris Lattner04421082008-04-08 04:40:51 +00004267 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'.
Daniel Dunbar33ad0122008-09-03 21:54:21 +00004268 VarDecl::StorageClass StorageClass = VarDecl::None;
Douglas Gregor16573fa2010-04-19 22:54:31 +00004269 VarDecl::StorageClass StorageClassAsWritten = VarDecl::None;
Daniel Dunbar33ad0122008-09-03 21:54:21 +00004270 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) {
4271 StorageClass = VarDecl::Register;
Douglas Gregor16573fa2010-04-19 22:54:31 +00004272 StorageClassAsWritten = VarDecl::Register;
Daniel Dunbar33ad0122008-09-03 21:54:21 +00004273 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) {
Chris Lattner04421082008-04-08 04:40:51 +00004274 Diag(DS.getStorageClassSpecLoc(),
4275 diag::err_invalid_storage_class_in_func_decl);
Chris Lattner985abd92008-06-26 06:49:43 +00004276 D.getMutableDeclSpec().ClearStorageClassSpecs();
Chris Lattner04421082008-04-08 04:40:51 +00004277 }
Eli Friedman63054b32009-04-19 20:27:55 +00004278
4279 if (D.getDeclSpec().isThreadSpecified())
4280 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
4281
Eli Friedman85a53192009-04-07 19:37:57 +00004282 DiagnoseFunctionSpecifiers(D);
4283
Douglas Gregor6d6eb572008-05-07 04:49:29 +00004284 // Check that there are no default arguments inside the type of this
4285 // parameter (C++ only).
4286 if (getLangOptions().CPlusPlus)
4287 CheckExtraCXXDefaultArguments(D);
Mike Stump1eb44332009-09-09 15:08:12 +00004288
Douglas Gregor402abb52009-05-28 23:31:59 +00004289 TagDecl *OwnedDecl = 0;
John McCallbf1a0282010-06-04 23:28:52 +00004290 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedDecl);
4291 QualType parmDeclType = TInfo->getType();
Mike Stump1eb44332009-09-09 15:08:12 +00004292
Douglas Gregor402abb52009-05-28 23:31:59 +00004293 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) {
4294 // C++ [dcl.fct]p6:
4295 // Types shall not be defined in return or parameter types.
4296 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type)
4297 << Context.getTypeDeclType(OwnedDecl);
4298 }
4299
Chris Lattnerd84aac12010-02-22 00:40:25 +00004300 // Check for redeclaration of parameters, e.g. int foo(int x, int x);
Chris Lattner04421082008-04-08 04:40:51 +00004301 IdentifierInfo *II = D.getIdentifier();
Chris Lattnercf79b012009-01-21 02:38:50 +00004302 if (II) {
John McCall10f28732010-03-18 06:42:38 +00004303 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName,
4304 ForRedeclaration);
4305 LookupName(R, S);
4306 if (R.isSingleResult()) {
4307 NamedDecl *PrevDecl = R.getFoundDecl();
Chris Lattnercf79b012009-01-21 02:38:50 +00004308 if (PrevDecl->isTemplateParameter()) {
4309 // Maybe we will complain about the shadowed template parameter.
4310 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
4311 // Just pretend that we didn't see the previous declaration.
4312 PrevDecl = 0;
Chris Lattnerb28317a2009-03-28 19:18:32 +00004313 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) {
Chris Lattnercf79b012009-01-21 02:38:50 +00004314 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II;
Chris Lattnerd84aac12010-02-22 00:40:25 +00004315 Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
Chris Lattner04421082008-04-08 04:40:51 +00004316
Chris Lattnercf79b012009-01-21 02:38:50 +00004317 // Recover by removing the name
4318 II = 0;
4319 D.SetIdentifier(0, D.getIdentifierLoc());
Fariborz Jahanian9a66c302010-02-12 21:53:14 +00004320 D.setInvalidType(true);
Chris Lattnercf79b012009-01-21 02:38:50 +00004321 }
Chris Lattner04421082008-04-08 04:40:51 +00004322 }
Reid Spencer5f016e22007-07-11 17:01:13 +00004323 }
Steve Naroff6a9f3e32007-08-07 22:44:21 +00004324
John McCall7a9813c2010-01-22 00:28:27 +00004325 // Temporarily put parameter variables in the translation unit, not
4326 // the enclosing context. This prevents them from accidentally
4327 // looking like class members in C++.
Douglas Gregorcb27b0f2010-04-12 07:48:19 +00004328 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(),
4329 TInfo, parmDeclType, II,
Douglas Gregor16573fa2010-04-19 22:54:31 +00004330 D.getIdentifierLoc(),
4331 StorageClass, StorageClassAsWritten);
Mike Stump1eb44332009-09-09 15:08:12 +00004332
Chris Lattnereaaebc72009-04-25 08:06:05 +00004333 if (D.isInvalidType())
Douglas Gregorcb27b0f2010-04-12 07:48:19 +00004334 New->setInvalidDecl();
4335
Chris Lattnerf97e8fa2009-04-11 19:34:56 +00004336 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1).
4337 if (D.getCXXScopeSpec().isSet()) {
4338 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator)
4339 << D.getCXXScopeSpec().getRange();
4340 New->setInvalidDecl();
4341 }
Douglas Gregorcb27b0f2010-04-12 07:48:19 +00004342
Douglas Gregor44b43212008-12-11 16:49:14 +00004343 // Add the parameter declaration into this scope.
Chris Lattnerb28317a2009-03-28 19:18:32 +00004344 S->AddDecl(DeclPtrTy::make(New));
Argyrios Kyrtzidis87f3ff02008-04-12 00:47:19 +00004345 if (II)
Douglas Gregor44b43212008-12-11 16:49:14 +00004346 IdResolver.AddDecl(New);
Nate Begemanb7894b52008-02-17 21:20:31 +00004347
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00004348 ProcessDeclAttributes(S, New, D);
Mike Stumpea000bf2009-04-30 00:19:40 +00004349
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00004350 if (New->hasAttr<BlocksAttr>()) {
Mike Stumpea000bf2009-04-30 00:19:40 +00004351 Diag(New->getLocation(), diag::err_block_on_nonlocal);
4352 }
Chris Lattnerb28317a2009-03-28 19:18:32 +00004353 return DeclPtrTy::make(New);
Reid Spencer5f016e22007-07-11 17:01:13 +00004354}
Fariborz Jahanian306d68f2007-11-08 23:49:49 +00004355
John McCall82dc0092010-06-04 11:21:44 +00004356/// \brief Synthesizes a variable for a parameter arising from a
4357/// typedef.
4358ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC,
4359 SourceLocation Loc,
4360 QualType T) {
4361 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, 0,
4362 T, Context.getTrivialTypeSourceInfo(T, Loc),
4363 VarDecl::None, VarDecl::None, 0);
4364 Param->setImplicit();
4365 return Param;
4366}
4367
Douglas Gregorcb27b0f2010-04-12 07:48:19 +00004368ParmVarDecl *Sema::CheckParameter(DeclContext *DC,
4369 TypeSourceInfo *TSInfo, QualType T,
4370 IdentifierInfo *Name,
4371 SourceLocation NameLoc,
Douglas Gregor16573fa2010-04-19 22:54:31 +00004372 VarDecl::StorageClass StorageClass,
4373 VarDecl::StorageClass StorageClassAsWritten) {
Douglas Gregorcb27b0f2010-04-12 07:48:19 +00004374 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, NameLoc, Name,
4375 adjustParameterType(T), TSInfo,
Douglas Gregor16573fa2010-04-19 22:54:31 +00004376 StorageClass, StorageClassAsWritten,
4377 0);
Douglas Gregorcb27b0f2010-04-12 07:48:19 +00004378
4379 // Parameters can not be abstract class types.
4380 // For record types, this is done by the AbstractClassUsageDiagnoser once
4381 // the class has been completely parsed.
4382 if (!CurContext->isRecord() &&
4383 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl,
4384 AbstractParamType))
4385 New->setInvalidDecl();
4386
4387 // Parameter declarators cannot be interface types. All ObjC objects are
4388 // passed by reference.
John McCallc12c5bb2010-05-15 11:32:37 +00004389 if (T->isObjCObjectType()) {
Douglas Gregorcb27b0f2010-04-12 07:48:19 +00004390 Diag(NameLoc,
4391 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T;
4392 New->setInvalidDecl();
4393 }
4394
4395 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage
4396 // duration shall not be qualified by an address-space qualifier."
4397 // Since all parameters have automatic store duration, they can not have
4398 // an address space.
4399 if (T.getAddressSpace() != 0) {
4400 Diag(NameLoc, diag::err_arg_with_address_space);
4401 New->setInvalidDecl();
4402 }
4403
4404 return New;
4405}
4406
Douglas Gregora3a83512009-04-01 23:51:29 +00004407void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D,
4408 SourceLocation LocAfterDecls) {
Reid Spencer5f016e22007-07-11 17:01:13 +00004409 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function &&
4410 "Not a function declarator!");
4411 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun;
Chris Lattner04421082008-04-08 04:40:51 +00004412
Reid Spencer5f016e22007-07-11 17:01:13 +00004413 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared'
4414 // for a K&R function.
4415 if (!FTI.hasPrototype) {
Douglas Gregor26103482009-04-02 03:14:12 +00004416 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) {
4417 --i;
Chris Lattner04421082008-04-08 04:40:51 +00004418 if (FTI.ArgInfo[i].Param == 0) {
Daniel Dunbar5ffe14c2009-10-18 20:26:27 +00004419 llvm::SmallString<256> Code;
4420 llvm::raw_svector_ostream(Code) << " int "
Daniel Dunbar01eb9b92009-10-18 21:17:35 +00004421 << FTI.ArgInfo[i].Ident->getName()
Daniel Dunbar5ffe14c2009-10-18 20:26:27 +00004422 << ";\n";
Chris Lattner3c73c412008-11-19 08:23:25 +00004423 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared)
Douglas Gregora3a83512009-04-01 23:51:29 +00004424 << FTI.ArgInfo[i].Ident
Douglas Gregor849b2432010-03-31 17:46:05 +00004425 << FixItHint::CreateInsertion(LocAfterDecls, Code.str());
Douglas Gregora3a83512009-04-01 23:51:29 +00004426
Reid Spencer5f016e22007-07-11 17:01:13 +00004427 // Implicitly declare the argument as type 'int' for lack of a better
4428 // type.
Chris Lattner04421082008-04-08 04:40:51 +00004429 DeclSpec DS;
4430 const char* PrevSpec; // unused
John McCallfec54012009-08-03 20:12:06 +00004431 unsigned DiagID; // unused
Mike Stump1eb44332009-09-09 15:08:12 +00004432 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc,
John McCallfec54012009-08-03 20:12:06 +00004433 PrevSpec, DiagID);
Chris Lattner04421082008-04-08 04:40:51 +00004434 Declarator ParamD(DS, Declarator::KNRTypeListContext);
4435 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc);
Douglas Gregorbe109b32009-01-23 16:23:13 +00004436 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD);
Reid Spencer5f016e22007-07-11 17:01:13 +00004437 }
4438 }
Mike Stump1eb44332009-09-09 15:08:12 +00004439 }
Douglas Gregorbe109b32009-01-23 16:23:13 +00004440}
4441
Chris Lattnerb28317a2009-03-28 19:18:32 +00004442Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope,
4443 Declarator &D) {
Douglas Gregorbe109b32009-01-23 16:23:13 +00004444 assert(getCurFunctionDecl() == 0 && "Function parsing confused");
4445 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function &&
4446 "Not a function declarator!");
4447 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun;
4448
4449 if (FTI.hasPrototype) {
Mike Stump1eb44332009-09-09 15:08:12 +00004450 // FIXME: Diagnose arguments without names in C.
Reid Spencer5f016e22007-07-11 17:01:13 +00004451 }
Mike Stump1eb44332009-09-09 15:08:12 +00004452
Douglas Gregor584049d2008-12-15 23:53:10 +00004453 Scope *ParentScope = FnBodyScope->getParent();
Steve Naroffadbbd0c2008-01-14 20:51:29 +00004454
Mike Stump1eb44332009-09-09 15:08:12 +00004455 DeclPtrTy DP = HandleDeclarator(ParentScope, D,
Douglas Gregore542c862009-06-23 23:11:28 +00004456 MultiTemplateParamsArg(*this),
4457 /*IsFunctionDefinition=*/true);
Chris Lattner682bf922009-03-29 16:50:03 +00004458 return ActOnStartOfFunctionDef(FnBodyScope, DP);
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +00004459}
4460
Anders Carlsson9f89dd72009-12-09 03:30:09 +00004461static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) {
4462 // Don't warn about invalid declarations.
4463 if (FD->isInvalidDecl())
4464 return false;
Anders Carlsson63fb6732009-12-09 03:44:46 +00004465
Anders Carlsson9f89dd72009-12-09 03:30:09 +00004466 // Or declarations that aren't global.
4467 if (!FD->isGlobal())
4468 return false;
Anders Carlsson63fb6732009-12-09 03:44:46 +00004469
Anders Carlsson9f89dd72009-12-09 03:30:09 +00004470 // Don't warn about C++ member functions.
4471 if (isa<CXXMethodDecl>(FD))
4472 return false;
Anders Carlsson63fb6732009-12-09 03:44:46 +00004473
Anders Carlsson9f89dd72009-12-09 03:30:09 +00004474 // Don't warn about 'main'.
4475 if (FD->isMain())
4476 return false;
Anders Carlsson63fb6732009-12-09 03:44:46 +00004477
Anders Carlsson9f89dd72009-12-09 03:30:09 +00004478 // Don't warn about inline functions.
4479 if (FD->isInlineSpecified())
4480 return false;
Anders Carlsson63fb6732009-12-09 03:44:46 +00004481
4482 // Don't warn about function templates.
4483 if (FD->getDescribedFunctionTemplate())
4484 return false;
4485
4486 // Don't warn about function template specializations.
4487 if (FD->isFunctionTemplateSpecialization())
4488 return false;
4489
Anders Carlsson9f89dd72009-12-09 03:30:09 +00004490 bool MissingPrototype = true;
4491 for (const FunctionDecl *Prev = FD->getPreviousDeclaration();
4492 Prev; Prev = Prev->getPreviousDeclaration()) {
4493 // Ignore any declarations that occur in function or method
4494 // scope, because they aren't visible from the header.
4495 if (Prev->getDeclContext()->isFunctionOrMethod())
4496 continue;
4497
4498 MissingPrototype = !Prev->getType()->isFunctionProtoType();
4499 break;
4500 }
4501
4502 return MissingPrototype;
4503}
4504
Chris Lattnerb28317a2009-03-28 19:18:32 +00004505Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) {
Anders Carlsson0ebb6d32009-10-29 15:46:07 +00004506 // Clear the last template instantiation error context.
4507 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation();
4508
Douglas Gregor52591bf2009-06-24 00:54:41 +00004509 if (!D)
4510 return D;
Douglas Gregord83d0402009-08-22 00:34:47 +00004511 FunctionDecl *FD = 0;
Mike Stump1eb44332009-09-09 15:08:12 +00004512
4513 if (FunctionTemplateDecl *FunTmpl
Douglas Gregord83d0402009-08-22 00:34:47 +00004514 = dyn_cast<FunctionTemplateDecl>(D.getAs<Decl>()))
4515 FD = FunTmpl->getTemplatedDecl();
4516 else
4517 FD = cast<FunctionDecl>(D.getAs<Decl>());
Douglas Gregor6fc17ff2008-10-29 15:10:40 +00004518
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00004519 // Enter a new function scope
4520 PushFunctionScope();
Mike Stump1eb44332009-09-09 15:08:12 +00004521
Douglas Gregor6fc17ff2008-10-29 15:10:40 +00004522 // See if this is a redefinition.
Charles Davisf3f8d2a2010-02-18 02:00:42 +00004523 // But don't complain if we're in GNU89 mode and the previous definition
4524 // was an extern inline function.
Douglas Gregor6fc17ff2008-10-29 15:10:40 +00004525 const FunctionDecl *Definition;
Charles Davisf3f8d2a2010-02-18 02:00:42 +00004526 if (FD->getBody(Definition) &&
4527 !canRedefineFunction(Definition, getLangOptions())) {
Chris Lattner08631c52008-11-23 21:45:46 +00004528 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName();
Chris Lattner5f4a6822008-11-23 23:12:31 +00004529 Diag(Definition->getLocation(), diag::note_previous_definition);
Douglas Gregor6fc17ff2008-10-29 15:10:40 +00004530 }
4531
Douglas Gregorcda9c672009-02-16 17:45:42 +00004532 // Builtin functions cannot be defined.
Douglas Gregor7814e6d2009-09-12 00:22:50 +00004533 if (unsigned BuiltinID = FD->getBuiltinID()) {
Douglas Gregor655753a2009-02-17 16:03:01 +00004534 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) {
Douglas Gregorcda9c672009-02-16 17:45:42 +00004535 Diag(FD->getLocation(), diag::err_builtin_definition) << FD;
Douglas Gregor655753a2009-02-17 16:03:01 +00004536 FD->setInvalidDecl();
4537 }
Douglas Gregorcda9c672009-02-16 17:45:42 +00004538 }
4539
Eli Friedman7f0f5dc2009-03-04 07:30:59 +00004540 // The return type of a function definition must be complete
Douglas Gregore7450f52009-03-24 19:52:54 +00004541 // (C99 6.9.1p3, C++ [dcl.fct]p6).
4542 QualType ResultType = FD->getResultType();
4543 if (!ResultType->isDependentType() && !ResultType->isVoidType() &&
Chris Lattner65e6a092009-04-29 05:12:23 +00004544 !FD->isInvalidDecl() &&
Douglas Gregore7450f52009-03-24 19:52:54 +00004545 RequireCompleteType(FD->getLocation(), ResultType,
4546 diag::err_func_def_incomplete_result))
Eli Friedman7f0f5dc2009-03-04 07:30:59 +00004547 FD->setInvalidDecl();
Eli Friedman7f0f5dc2009-03-04 07:30:59 +00004548
Douglas Gregor8499f3f2009-03-31 16:35:03 +00004549 // GNU warning -Wmissing-prototypes:
4550 // Warn if a global function is defined without a previous
4551 // prototype declaration. This warning is issued even if the
4552 // definition itself provides a prototype. The aim is to detect
4553 // global functions that fail to be declared in header files.
Anders Carlsson9f89dd72009-12-09 03:30:09 +00004554 if (ShouldWarnAboutMissingPrototype(FD))
4555 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD;
Douglas Gregor8499f3f2009-03-31 16:35:03 +00004556
Douglas Gregore2c31ff2009-05-15 17:59:04 +00004557 if (FnBodyScope)
4558 PushDeclContext(FnBodyScope, FD);
Anton Korobeynikov2f402702008-12-26 00:52:02 +00004559
Chris Lattner04421082008-04-08 04:40:51 +00004560 // Check the validity of our function parameters
4561 CheckParmsForFunctionDef(FD);
4562
John McCall053f4bd2010-03-22 09:20:08 +00004563 bool ShouldCheckShadow =
4564 Diags.getDiagnosticLevel(diag::warn_decl_shadow) != Diagnostic::Ignored;
4565
Chris Lattner04421082008-04-08 04:40:51 +00004566 // Introduce our parameters into the function scope
4567 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) {
4568 ParmVarDecl *Param = FD->getParamDecl(p);
Douglas Gregora8cc8ce2009-01-09 18:51:29 +00004569 Param->setOwningFunction(FD);
4570
Chris Lattner04421082008-04-08 04:40:51 +00004571 // If this has an identifier, add it to the scope stack.
John McCall053f4bd2010-03-22 09:20:08 +00004572 if (Param->getIdentifier() && FnBodyScope) {
4573 if (ShouldCheckShadow)
4574 CheckShadow(FnBodyScope, Param);
4575
Argyrios Kyrtzidis87f3ff02008-04-12 00:47:19 +00004576 PushOnScopeChains(Param, FnBodyScope);
John McCall053f4bd2010-03-22 09:20:08 +00004577 }
Reid Spencer5f016e22007-07-11 17:01:13 +00004578 }
Chris Lattner04421082008-04-08 04:40:51 +00004579
Anton Korobeynikov2f402702008-12-26 00:52:02 +00004580 // Checking attributes of current function definition
4581 // dllimport attribute.
Mike Stump1eb44332009-09-09 15:08:12 +00004582 if (FD->getAttr<DLLImportAttr>() &&
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00004583 (!FD->getAttr<DLLExportAttr>())) {
Anton Korobeynikov2f402702008-12-26 00:52:02 +00004584 // dllimport attribute cannot be applied to definition.
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00004585 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) {
Anton Korobeynikov2f402702008-12-26 00:52:02 +00004586 Diag(FD->getLocation(),
4587 diag::err_attribute_can_be_applied_only_to_symbol_declaration)
4588 << "dllimport";
4589 FD->setInvalidDecl();
Chris Lattnerb28317a2009-03-28 19:18:32 +00004590 return DeclPtrTy::make(FD);
Ted Kremenek12911a82010-02-21 05:12:53 +00004591 }
4592
4593 // Visual C++ appears to not think this is an issue, so only issue
4594 // a warning when Microsoft extensions are disabled.
4595 if (!LangOpts.Microsoft) {
Anton Korobeynikov2f402702008-12-26 00:52:02 +00004596 // If a symbol previously declared dllimport is later defined, the
4597 // attribute is ignored in subsequent references, and a warning is
4598 // emitted.
4599 Diag(FD->getLocation(),
4600 diag::warn_redeclaration_without_attribute_prev_attribute_ignored)
4601 << FD->getNameAsCString() << "dllimport";
4602 }
4603 }
Chris Lattnerb28317a2009-03-28 19:18:32 +00004604 return DeclPtrTy::make(FD);
Reid Spencer5f016e22007-07-11 17:01:13 +00004605}
4606
Douglas Gregor5077c382010-05-15 06:01:05 +00004607/// \brief Given the set of return statements within a function body,
4608/// compute the variables that are subject to the named return value
4609/// optimization.
4610///
4611/// Each of the variables that is subject to the named return value
4612/// optimization will be marked as NRVO variables in the AST, and any
4613/// return statement that has a marked NRVO variable as its NRVO candidate can
4614/// use the named return value optimization.
4615///
4616/// This function applies a very simplistic algorithm for NRVO: if every return
4617/// statement in the function has the same NRVO candidate, that candidate is
4618/// the NRVO variable.
4619///
4620/// FIXME: Employ a smarter algorithm that accounts for multiple return
4621/// statements and the lifetimes of the NRVO candidates. We should be able to
4622/// find a maximal set of NRVO variables.
4623static void ComputeNRVO(Stmt *Body, ReturnStmt **Returns, unsigned NumReturns) {
4624 const VarDecl *NRVOCandidate = 0;
4625 for (unsigned I = 0; I != NumReturns; ++I) {
4626 if (!Returns[I]->getNRVOCandidate())
4627 return;
4628
4629 if (!NRVOCandidate)
4630 NRVOCandidate = Returns[I]->getNRVOCandidate();
4631 else if (NRVOCandidate != Returns[I]->getNRVOCandidate())
4632 return;
4633 }
4634
4635 if (NRVOCandidate)
4636 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true);
4637}
4638
Chris Lattnerb28317a2009-03-28 19:18:32 +00004639Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) {
Douglas Gregore2c31ff2009-05-15 17:59:04 +00004640 return ActOnFinishFunctionBody(D, move(BodyArg), false);
4641}
4642
4643Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg,
4644 bool IsInstantiation) {
Chris Lattnerb28317a2009-03-28 19:18:32 +00004645 Decl *dcl = D.getAs<Decl>();
Sebastian Redld3a413d2009-04-26 20:35:05 +00004646 Stmt *Body = BodyArg.takeAs<Stmt>();
Douglas Gregord83d0402009-08-22 00:34:47 +00004647
4648 FunctionDecl *FD = 0;
4649 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl);
4650 if (FunTmpl)
4651 FD = FunTmpl->getTemplatedDecl();
4652 else
4653 FD = dyn_cast_or_null<FunctionDecl>(dcl);
4654
Ted Kremenekd064fdc2010-03-23 00:13:23 +00004655 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy();
Ted Kremenekdbdbaaf2010-03-20 21:06:02 +00004656
Douglas Gregord83d0402009-08-22 00:34:47 +00004657 if (FD) {
Chris Lattnera5251fc2009-04-18 09:36:27 +00004658 FD->setBody(Body);
Ted Kremenekdbdbaaf2010-03-20 21:06:02 +00004659 if (FD->isMain()) {
Mike Stump5f28a1e2009-07-24 02:49:01 +00004660 // C and C++ allow for main to automagically return 0.
John McCall0cfeb632009-07-28 01:00:58 +00004661 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3.
4662 FD->setHasImplicitReturnZero(true);
Ted Kremenekd064fdc2010-03-23 00:13:23 +00004663 WP.disableCheckFallThrough();
Ted Kremenekdbdbaaf2010-03-20 21:06:02 +00004664 }
Mike Stump1eb44332009-09-09 15:08:12 +00004665
Douglas Gregor6fb745b2010-05-13 16:44:06 +00004666 if (!FD->isInvalidDecl()) {
Douglas Gregore0762c92009-06-19 23:52:42 +00004667 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end());
Douglas Gregor6fb745b2010-05-13 16:44:06 +00004668
4669 // If this is a constructor, we need a vtable.
4670 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD))
4671 MarkVTableUsed(FD->getLocation(), Constructor->getParent());
Douglas Gregor5077c382010-05-15 06:01:05 +00004672
4673 ComputeNRVO(Body, FunctionScopes.back()->Returns.data(),
4674 FunctionScopes.back()->Returns.size());
Douglas Gregor6fb745b2010-05-13 16:44:06 +00004675 }
4676
Argyrios Kyrtzidis53d0ea52008-06-28 06:07:14 +00004677 assert(FD == getCurFunctionDecl() && "Function parsing confused");
Steve Naroff394f3f42008-07-25 17:57:26 +00004678 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) {
Chris Lattnerffed1632009-02-16 19:27:54 +00004679 assert(MD == getCurMethodDecl() && "Method parsing confused");
Chris Lattnera5251fc2009-04-18 09:36:27 +00004680 MD->setBody(Body);
Argyrios Kyrtzidisa2e85ad2009-07-18 00:33:33 +00004681 MD->setEndLoc(Body->getLocEnd());
Douglas Gregore0762c92009-06-19 23:52:42 +00004682 if (!MD->isInvalidDecl())
4683 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end());
Ted Kremenek8189cde2009-02-07 01:47:29 +00004684 } else {
4685 Body->Destroy(Context);
Chris Lattnerb28317a2009-03-28 19:18:32 +00004686 return DeclPtrTy();
Ted Kremenek8189cde2009-02-07 01:47:29 +00004687 }
Douglas Gregore2c31ff2009-05-15 17:59:04 +00004688
Reid Spencer5f016e22007-07-11 17:01:13 +00004689 // Verify and clean out per-function state.
Eli Friedman8f17b662009-02-28 05:41:13 +00004690
Reid Spencer5f016e22007-07-11 17:01:13 +00004691 // Check goto/label use.
Steve Naroffcaaacec2009-03-13 15:38:40 +00004692 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00004693 I = getLabelMap().begin(), E = getLabelMap().end(); I != E; ++I) {
Chris Lattnere32f74c2009-04-18 19:30:02 +00004694 LabelStmt *L = I->second;
Mike Stump1eb44332009-09-09 15:08:12 +00004695
Reid Spencer5f016e22007-07-11 17:01:13 +00004696 // Verify that we have no forward references left. If so, there was a goto
4697 // or address of a label taken, but no definition of it. Label fwd
4698 // definitions are indicated with a null substmt.
Chris Lattnere32f74c2009-04-18 19:30:02 +00004699 if (L->getSubStmt() != 0)
4700 continue;
Mike Stump1eb44332009-09-09 15:08:12 +00004701
Chris Lattnere32f74c2009-04-18 19:30:02 +00004702 // Emit error.
4703 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName();
Mike Stump1eb44332009-09-09 15:08:12 +00004704
Chris Lattnere32f74c2009-04-18 19:30:02 +00004705 // At this point, we have gotos that use the bogus label. Stitch it into
4706 // the function body so that they aren't leaked and that the AST is well
4707 // formed.
4708 if (Body == 0) {
4709 // The whole function wasn't parsed correctly, just delete this.
4710 L->Destroy(Context);
4711 continue;
Reid Spencer5f016e22007-07-11 17:01:13 +00004712 }
Mike Stump1eb44332009-09-09 15:08:12 +00004713
Chris Lattnere32f74c2009-04-18 19:30:02 +00004714 // Otherwise, the body is valid: we want to stitch the label decl into the
4715 // function somewhere so that it is properly owned and so that the goto
4716 // has a valid target. Do this by creating a new compound stmt with the
4717 // label in it.
Sebastian Redld3a413d2009-04-26 20:35:05 +00004718
Chris Lattnere32f74c2009-04-18 19:30:02 +00004719 // Give the label a sub-statement.
4720 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc()));
Sebastian Redld3a413d2009-04-26 20:35:05 +00004721
4722 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ?
4723 cast<CXXTryStmt>(Body)->getTryBlock() :
4724 cast<CompoundStmt>(Body);
Ted Kremenek4c9f7092010-03-12 22:22:36 +00004725 llvm::SmallVector<Stmt*, 64> Elements(Compound->body_begin(),
4726 Compound->body_end());
Chris Lattnere32f74c2009-04-18 19:30:02 +00004727 Elements.push_back(L);
Ted Kremenek4c9f7092010-03-12 22:22:36 +00004728 Compound->setStmts(Context, Elements.data(), Elements.size());
Reid Spencer5f016e22007-07-11 17:01:13 +00004729 }
Eli Friedman8f17b662009-02-28 05:41:13 +00004730
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00004731 if (Body) {
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00004732 // C++ constructors that have function-try-blocks can't have return
4733 // statements in the handlers of that block. (C++ [except.handle]p14)
4734 // Verify this.
4735 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body))
4736 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body));
4737
Ted Kremenekdbdbaaf2010-03-20 21:06:02 +00004738 // Verify that that gotos and switch cases don't jump into scopes illegally.
4739 // Verify that that gotos and switch cases don't jump into scopes illegally.
John McCalldae69ef2010-05-20 07:05:55 +00004740 if (FunctionNeedsScopeChecking() &&
John McCall8a2ca742010-05-20 07:13:26 +00004741 !dcl->isInvalidDecl() &&
John McCalldae69ef2010-05-20 07:05:55 +00004742 !hasAnyErrorsInThisFunction())
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00004743 DiagnoseInvalidJumps(Body);
Mike Stump1eb44332009-09-09 15:08:12 +00004744
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00004745 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl))
John McCallef027fe2010-03-16 21:39:52 +00004746 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(),
4747 Destructor->getParent());
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00004748
4749 // If any errors have occurred, clear out any temporaries that may have
4750 // been leftover. This ensures that these temporaries won't be picked up for
4751 // deletion in some later function.
4752 if (PP.getDiagnostics().hasErrorOccurred())
4753 ExprTemporaries.clear();
Ted Kremenekdbdbaaf2010-03-20 21:06:02 +00004754 else if (!isa<FunctionTemplateDecl>(dcl)) {
4755 // Since the body is valid, issue any analysis-based warnings that are
4756 // enabled.
4757 QualType ResultType;
4758 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(dcl)) {
4759 ResultType = FD->getResultType();
4760 }
4761 else {
4762 ObjCMethodDecl *MD = cast<ObjCMethodDecl>(dcl);
4763 ResultType = MD->getResultType();
4764 }
Ted Kremenekd064fdc2010-03-23 00:13:23 +00004765 AnalysisWarnings.IssueWarnings(WP, dcl);
Ted Kremenekdbdbaaf2010-03-20 21:06:02 +00004766 }
4767
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00004768 assert(ExprTemporaries.empty() && "Leftover temporaries in function");
4769 }
4770
John McCall90f97892010-03-25 22:08:03 +00004771 if (!IsInstantiation)
4772 PopDeclContext();
4773
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00004774 PopFunctionOrBlockScope();
Anders Carlssonf8a9a792009-11-13 19:21:49 +00004775
Douglas Gregord5b57282009-11-15 07:07:58 +00004776 // If any errors have occurred, clear out any temporaries that may have
4777 // been leftover. This ensures that these temporaries won't be picked up for
4778 // deletion in some later function.
Chris Lattner6d97e5e2010-03-01 20:59:53 +00004779 if (getDiagnostics().hasErrorOccurred())
Douglas Gregord5b57282009-11-15 07:07:58 +00004780 ExprTemporaries.clear();
4781
Steve Naroffd6d054d2007-11-11 23:20:51 +00004782 return D;
Fariborz Jahanian60fbca02007-11-10 16:31:34 +00004783}
4784
Reid Spencer5f016e22007-07-11 17:01:13 +00004785/// ImplicitlyDefineFunction - An undeclared identifier was used in a function
4786/// call, forming a call to an implicitly defined function (per C99 6.5.1p2).
Mike Stump1eb44332009-09-09 15:08:12 +00004787NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc,
Douglas Gregor4afa39d2009-01-20 01:17:11 +00004788 IdentifierInfo &II, Scope *S) {
Douglas Gregor63935192009-03-02 00:19:53 +00004789 // Before we produce a declaration for an implicitly defined
4790 // function, see whether there was a locally-scoped declaration of
4791 // this name as a function or variable. If so, use that
4792 // (non-visible) declaration, and complain about it.
4793 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
4794 = LocallyScopedExternalDecls.find(&II);
4795 if (Pos != LocallyScopedExternalDecls.end()) {
4796 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second;
4797 Diag(Pos->second->getLocation(), diag::note_previous_declaration);
4798 return Pos->second;
4799 }
4800
Chris Lattner37d10842008-05-05 21:18:06 +00004801 // Extension in C99. Legal in C90, but warn about it.
Daniel Dunbar01eb9b92009-10-18 21:17:35 +00004802 if (II.getName().startswith("__builtin_"))
Douglas Gregor9a8c9a22009-09-28 21:14:19 +00004803 Diag(Loc, diag::warn_builtin_unknown) << &II;
4804 else if (getLangOptions().C99)
Chris Lattner3c73c412008-11-19 08:23:25 +00004805 Diag(Loc, diag::ext_implicit_function_decl) << &II;
Chris Lattner37d10842008-05-05 21:18:06 +00004806 else
Chris Lattner3c73c412008-11-19 08:23:25 +00004807 Diag(Loc, diag::warn_implicit_function_decl) << &II;
Mike Stump1eb44332009-09-09 15:08:12 +00004808
Reid Spencer5f016e22007-07-11 17:01:13 +00004809 // Set a Declarator for the implicit definition: int foo();
4810 const char *Dummy;
4811 DeclSpec DS;
John McCallfec54012009-08-03 20:12:06 +00004812 unsigned DiagID;
4813 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID);
Reid Spencer5f016e22007-07-11 17:01:13 +00004814 Error = Error; // Silence warning.
4815 assert(!Error && "Error setting up implicit decl!");
4816 Declarator D(DS, Declarator::BlockContext);
Sebastian Redl7dc81342009-04-29 17:30:04 +00004817 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0,
Sebastian Redl3cc97262009-05-31 11:47:27 +00004818 0, 0, false, SourceLocation(),
Argyrios Kyrtzidis82bf0102009-08-19 23:14:54 +00004819 false, 0,0,0, Loc, Loc, D),
Sebastian Redlab197ba2009-02-09 18:23:29 +00004820 SourceLocation());
Reid Spencer5f016e22007-07-11 17:01:13 +00004821 D.SetIdentifier(&II, Loc);
Sebastian Redlab197ba2009-02-09 18:23:29 +00004822
Argyrios Kyrtzidis93213bb2008-05-01 21:04:16 +00004823 // Insert this function into translation-unit scope.
4824
4825 DeclContext *PrevDC = CurContext;
4826 CurContext = Context.getTranslationUnitDecl();
Mike Stump1eb44332009-09-09 15:08:12 +00004827
4828 FunctionDecl *FD =
Douglas Gregor2e01cda2009-06-23 21:43:56 +00004829 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D).getAs<Decl>());
Steve Naroffe2ef8152008-04-04 14:32:09 +00004830 FD->setImplicit();
Argyrios Kyrtzidis93213bb2008-05-01 21:04:16 +00004831
4832 CurContext = PrevDC;
4833
Douglas Gregor3c385e52009-02-14 18:57:46 +00004834 AddKnownFunctionAttributes(FD);
4835
Steve Naroffe2ef8152008-04-04 14:32:09 +00004836 return FD;
Reid Spencer5f016e22007-07-11 17:01:13 +00004837}
4838
Douglas Gregor3c385e52009-02-14 18:57:46 +00004839/// \brief Adds any function attributes that we know a priori based on
4840/// the declaration of this function.
4841///
4842/// These attributes can apply both to implicitly-declared builtins
4843/// (like __builtin___printf_chk) or to library-declared functions
4844/// like NSLog or printf.
4845void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) {
4846 if (FD->isInvalidDecl())
4847 return;
4848
4849 // If this is a built-in function, map its builtin attributes to
4850 // actual attributes.
Douglas Gregor7814e6d2009-09-12 00:22:50 +00004851 if (unsigned BuiltinID = FD->getBuiltinID()) {
Douglas Gregor3c385e52009-02-14 18:57:46 +00004852 // Handle printf-formatting attributes.
4853 unsigned FormatIdx;
4854 bool HasVAListArg;
4855 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) {
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00004856 if (!FD->getAttr<FormatAttr>())
Ted Kremenek3d2c43e2010-02-11 05:28:37 +00004857 FD->addAttr(::new (Context) FormatAttr(Context, "printf", FormatIdx+1,
4858 HasVAListArg ? 0 : FormatIdx+2));
Douglas Gregor3c385e52009-02-14 18:57:46 +00004859 }
Daniel Dunbaref2abfe2009-02-16 22:43:43 +00004860
4861 // Mark const if we don't care about errno and that is the only
4862 // thing preventing the function from being const. This allows
4863 // IRgen to use LLVM intrinsics for such functions.
4864 if (!getLangOptions().MathErrno &&
4865 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) {
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00004866 if (!FD->getAttr<ConstAttr>())
4867 FD->addAttr(::new (Context) ConstAttr());
Daniel Dunbaref2abfe2009-02-16 22:43:43 +00004868 }
Mike Stump0feecbb2009-07-27 19:14:18 +00004869
4870 if (Context.BuiltinInfo.isNoReturn(BuiltinID))
John McCall04a67a62010-02-05 21:31:56 +00004871 FD->setType(Context.getNoReturnType(FD->getType()));
Chris Lattner551f7082009-12-30 22:06:22 +00004872 if (Context.BuiltinInfo.isNoThrow(BuiltinID))
4873 FD->addAttr(::new (Context) NoThrowAttr());
4874 if (Context.BuiltinInfo.isConst(BuiltinID))
4875 FD->addAttr(::new (Context) ConstAttr());
Douglas Gregor3c385e52009-02-14 18:57:46 +00004876 }
4877
4878 IdentifierInfo *Name = FD->getIdentifier();
4879 if (!Name)
4880 return;
Mike Stump1eb44332009-09-09 15:08:12 +00004881 if ((!getLangOptions().CPlusPlus &&
Douglas Gregor3c385e52009-02-14 18:57:46 +00004882 FD->getDeclContext()->isTranslationUnit()) ||
4883 (isa<LinkageSpecDecl>(FD->getDeclContext()) &&
Mike Stump1eb44332009-09-09 15:08:12 +00004884 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() ==
Douglas Gregor3c385e52009-02-14 18:57:46 +00004885 LinkageSpecDecl::lang_c)) {
4886 // Okay: this could be a libc/libm/Objective-C function we know
4887 // about.
4888 } else
4889 return;
4890
Douglas Gregor21e072b2009-04-22 20:56:09 +00004891 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) {
Mike Stump523a8fd2009-07-28 00:07:08 +00004892 // FIXME: NSLog and NSLogv should be target specific
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00004893 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) {
Douglas Gregor3c385e52009-02-14 18:57:46 +00004894 // FIXME: We known better than our headers.
Ted Kremenek3d2c43e2010-02-11 05:28:37 +00004895 const_cast<FormatAttr *>(Format)->setType(Context, "printf");
Mike Stump1eb44332009-09-09 15:08:12 +00004896 } else
Ted Kremenek3d2c43e2010-02-11 05:28:37 +00004897 FD->addAttr(::new (Context) FormatAttr(Context, "printf", 1,
Eli Friedmand7dad722009-06-10 04:01:38 +00004898 Name->isStr("NSLogv") ? 0 : 2));
Douglas Gregor21e072b2009-04-22 20:56:09 +00004899 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) {
Mike Stump523a8fd2009-07-28 00:07:08 +00004900 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be
Mike Stump1eb44332009-09-09 15:08:12 +00004901 // target-specific builtins, perhaps?
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00004902 if (!FD->getAttr<FormatAttr>())
Ted Kremenek3d2c43e2010-02-11 05:28:37 +00004903 FD->addAttr(::new (Context) FormatAttr(Context, "printf", 2,
Eli Friedmand7dad722009-06-10 04:01:38 +00004904 Name->isStr("vasprintf") ? 0 : 3));
Mike Stump782fa302009-07-28 02:25:19 +00004905 }
Douglas Gregor3c385e52009-02-14 18:57:46 +00004906}
Reid Spencer5f016e22007-07-11 17:01:13 +00004907
John McCallba6a9bd2009-10-24 08:00:42 +00004908TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T,
John McCalla93c9342009-12-07 02:54:59 +00004909 TypeSourceInfo *TInfo) {
Reid Spencer5f016e22007-07-11 17:01:13 +00004910 assert(D.getIdentifier() && "Wrong callback for declspec without declarator");
Steve Naroff5912a352007-08-28 20:14:24 +00004911 assert(!T.isNull() && "GetTypeForDeclarator() returned null type");
Mike Stump1eb44332009-09-09 15:08:12 +00004912
John McCalla93c9342009-12-07 02:54:59 +00004913 if (!TInfo) {
John McCallba6a9bd2009-10-24 08:00:42 +00004914 assert(D.isInvalidType() && "no declarator info for valid type");
John McCalla93c9342009-12-07 02:54:59 +00004915 TInfo = Context.getTrivialTypeSourceInfo(T);
John McCallba6a9bd2009-10-24 08:00:42 +00004916 }
4917
Reid Spencer5f016e22007-07-11 17:01:13 +00004918 // Scope manipulation handled by caller.
Chris Lattner0ed844b2008-04-04 06:12:32 +00004919 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext,
4920 D.getIdentifierLoc(),
Mike Stump1eb44332009-09-09 15:08:12 +00004921 D.getIdentifier(),
John McCalla93c9342009-12-07 02:54:59 +00004922 TInfo);
Mike Stump1eb44332009-09-09 15:08:12 +00004923
John McCall2191b202009-09-05 06:31:47 +00004924 if (const TagType *TT = T->getAs<TagType>()) {
Anders Carlsson4843e582009-03-10 17:07:44 +00004925 TagDecl *TD = TT->getDecl();
Mike Stump1eb44332009-09-09 15:08:12 +00004926
Anders Carlsson4843e582009-03-10 17:07:44 +00004927 // If the TagDecl that the TypedefDecl points to is an anonymous decl
4928 // keep track of the TypedefDecl.
4929 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl())
4930 TD->setTypedefForAnonDecl(NewTD);
4931 }
4932
Chris Lattnereaaebc72009-04-25 08:06:05 +00004933 if (D.isInvalidType())
Steve Naroff5912a352007-08-28 20:14:24 +00004934 NewTD->setInvalidDecl();
4935 return NewTD;
Reid Spencer5f016e22007-07-11 17:01:13 +00004936}
4937
Douglas Gregor501c5ce2009-05-14 16:41:31 +00004938
4939/// \brief Determine whether a tag with a given kind is acceptable
4940/// as a redeclaration of the given tag declaration.
4941///
4942/// \returns true if the new tag kind is acceptable, false otherwise.
Mike Stump1eb44332009-09-09 15:08:12 +00004943bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous,
Abramo Bagnara465d41b2010-05-11 21:36:43 +00004944 TagTypeKind NewTag,
Douglas Gregor501c5ce2009-05-14 16:41:31 +00004945 SourceLocation NewTagLoc,
4946 const IdentifierInfo &Name) {
4947 // C++ [dcl.type.elab]p3:
4948 // The class-key or enum keyword present in the
4949 // elaborated-type-specifier shall agree in kind with the
Abramo Bagnara465d41b2010-05-11 21:36:43 +00004950 // declaration to which the name in the elaborated-type-specifier
Douglas Gregor501c5ce2009-05-14 16:41:31 +00004951 // refers. This rule also applies to the form of
4952 // elaborated-type-specifier that declares a class-name or
4953 // friend class since it can be construed as referring to the
4954 // definition of the class. Thus, in any
4955 // elaborated-type-specifier, the enum keyword shall be used to
Abramo Bagnara465d41b2010-05-11 21:36:43 +00004956 // refer to an enumeration (7.2), the union class-key shall be
Douglas Gregor501c5ce2009-05-14 16:41:31 +00004957 // used to refer to a union (clause 9), and either the class or
4958 // struct class-key shall be used to refer to a class (clause 9)
4959 // declared using the class or struct class-key.
Abramo Bagnara465d41b2010-05-11 21:36:43 +00004960 TagTypeKind OldTag = Previous->getTagKind();
Douglas Gregor501c5ce2009-05-14 16:41:31 +00004961 if (OldTag == NewTag)
4962 return true;
Mike Stump1eb44332009-09-09 15:08:12 +00004963
Abramo Bagnara465d41b2010-05-11 21:36:43 +00004964 if ((OldTag == TTK_Struct || OldTag == TTK_Class) &&
4965 (NewTag == TTK_Struct || NewTag == TTK_Class)) {
Douglas Gregor501c5ce2009-05-14 16:41:31 +00004966 // Warn about the struct/class tag mismatch.
4967 bool isTemplate = false;
4968 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous))
4969 isTemplate = Record->getDescribedClassTemplate();
4970
4971 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch)
Abramo Bagnara465d41b2010-05-11 21:36:43 +00004972 << (NewTag == TTK_Class)
Douglas Gregor501c5ce2009-05-14 16:41:31 +00004973 << isTemplate << &Name
Douglas Gregor849b2432010-03-31 17:46:05 +00004974 << FixItHint::CreateReplacement(SourceRange(NewTagLoc),
Abramo Bagnara465d41b2010-05-11 21:36:43 +00004975 OldTag == TTK_Class? "class" : "struct");
Douglas Gregor501c5ce2009-05-14 16:41:31 +00004976 Diag(Previous->getLocation(), diag::note_previous_use);
4977 return true;
4978 }
4979 return false;
4980}
4981
Steve Naroff08d92e42007-09-15 18:49:24 +00004982/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the
Reid Spencer5f016e22007-07-11 17:01:13 +00004983/// former case, Name will be non-null. In the later case, Name will be null.
John McCall0f434ec2009-07-31 02:45:11 +00004984/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a
Reid Spencer5f016e22007-07-11 17:01:13 +00004985/// reference/declaration/definition of a tag.
John McCall0f434ec2009-07-31 02:45:11 +00004986Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +00004987 SourceLocation KWLoc, CXXScopeSpec &SS,
Chris Lattnerb28317a2009-03-28 19:18:32 +00004988 IdentifierInfo *Name, SourceLocation NameLoc,
Douglas Gregor402abb52009-05-28 23:31:59 +00004989 AttributeList *Attr, AccessSpecifier AS,
Douglas Gregor7cdbc582009-07-22 23:48:44 +00004990 MultiTemplateParamsArg TemplateParameterLists,
John McCallc4e70192009-09-11 04:59:25 +00004991 bool &OwnedDecl, bool &IsDependent) {
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00004992 // If this is not a definition, it must have a name.
John McCall0f434ec2009-07-31 02:45:11 +00004993 assert((Name != 0 || TUK == TUK_Definition) &&
Reid Spencer5f016e22007-07-11 17:01:13 +00004994 "Nameless record must be a definition!");
Douglas Gregoraaba5e32009-02-04 19:02:06 +00004995
Douglas Gregor402abb52009-05-28 23:31:59 +00004996 OwnedDecl = false;
Abramo Bagnara465d41b2010-05-11 21:36:43 +00004997 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
Mike Stump1eb44332009-09-09 15:08:12 +00004998
Douglas Gregor1fef4e62009-10-07 22:35:40 +00004999 // FIXME: Check explicit specializations more carefully.
5000 bool isExplicitSpecialization = false;
Abramo Bagnara9b934882010-06-12 08:15:14 +00005001 unsigned NumMatchedTemplateParamLists = TemplateParameterLists.size();
John McCall0f434ec2009-07-31 02:45:11 +00005002 if (TUK != TUK_Reference) {
Douglas Gregor7cdbc582009-07-22 23:48:44 +00005003 if (TemplateParameterList *TemplateParams
5004 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS,
5005 (TemplateParameterList**)TemplateParameterLists.get(),
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005006 TemplateParameterLists.size(),
John McCall77e8b112010-04-13 20:37:33 +00005007 TUK == TUK_Friend,
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005008 isExplicitSpecialization)) {
Abramo Bagnara9b934882010-06-12 08:15:14 +00005009 // All but one template parameter lists have been matching.
5010 --NumMatchedTemplateParamLists;
5011
Douglas Gregord85bea22009-09-26 06:47:28 +00005012 if (TemplateParams->size() > 0) {
Douglas Gregor7cdbc582009-07-22 23:48:44 +00005013 // This is a declaration or definition of a class template (which may
5014 // be a member of another template).
5015 OwnedDecl = false;
John McCall0f434ec2009-07-31 02:45:11 +00005016 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc,
Douglas Gregor7cdbc582009-07-22 23:48:44 +00005017 SS, Name, NameLoc, Attr,
Douglas Gregor05396e22009-08-25 17:23:04 +00005018 TemplateParams,
Douglas Gregor7cdbc582009-07-22 23:48:44 +00005019 AS);
Douglas Gregor05396e22009-08-25 17:23:04 +00005020 TemplateParameterLists.release();
Douglas Gregor7cdbc582009-07-22 23:48:44 +00005021 return Result.get();
5022 } else {
Douglas Gregorf6b11852009-10-08 15:14:33 +00005023 // The "template<>" header is extraneous.
5024 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams)
Abramo Bagnara465d41b2010-05-11 21:36:43 +00005025 << TypeWithKeyword::getTagTypeKindName(Kind) << Name;
Douglas Gregorf6b11852009-10-08 15:14:33 +00005026 isExplicitSpecialization = true;
Douglas Gregor7cdbc582009-07-22 23:48:44 +00005027 }
Mike Stump1eb44332009-09-09 15:08:12 +00005028 }
5029 }
5030
Douglas Gregor4920f1f2009-01-12 22:49:06 +00005031 DeclContext *SearchDC = CurContext;
Argyrios Kyrtzidis0f84a232008-11-09 22:53:32 +00005032 DeclContext *DC = CurContext;
Douglas Gregor7adb10f2009-09-15 22:30:29 +00005033 bool isStdBadAlloc = false;
Douglas Gregor0b7a1582009-01-17 00:42:38 +00005034 bool Invalid = false;
5035
Chandler Carruth7bf36002010-03-01 21:17:36 +00005036 RedeclarationKind Redecl = ForRedeclaration;
5037 if (TUK == TUK_Friend || TUK == TUK_Reference)
5038 Redecl = NotForRedeclaration;
John McCall68263142009-11-18 22:49:29 +00005039
5040 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl);
John McCall6e247262009-10-10 05:48:19 +00005041
Argyrios Kyrtzidis630c81b2008-11-09 22:09:58 +00005042 if (Name && SS.isNotEmpty()) {
5043 // We have a nested-name tag ('struct foo::bar').
5044
5045 // Check for invalid 'foo::'.
Argyrios Kyrtzidis0f84a232008-11-09 22:53:32 +00005046 if (SS.isInvalid()) {
Argyrios Kyrtzidis630c81b2008-11-09 22:09:58 +00005047 Name = 0;
5048 goto CreateNewDecl;
5049 }
5050
John McCallc4e70192009-09-11 04:59:25 +00005051 // If this is a friend or a reference to a class in a dependent
5052 // context, don't try to make a decl for it.
5053 if (TUK == TUK_Friend || TUK == TUK_Reference) {
5054 DC = computeDeclContext(SS, false);
5055 if (!DC) {
5056 IsDependent = true;
5057 return DeclPtrTy();
5058 }
John McCall77bb1aa2010-05-01 00:40:08 +00005059 } else {
5060 DC = computeDeclContext(SS, true);
5061 if (!DC) {
5062 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec)
5063 << SS.getRange();
5064 return DeclPtrTy();
5065 }
John McCallc4e70192009-09-11 04:59:25 +00005066 }
5067
John McCall77bb1aa2010-05-01 00:40:08 +00005068 if (RequireCompleteDeclContext(SS, DC))
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00005069 return DeclPtrTy::make((Decl *)0);
5070
Douglas Gregor1931b442009-02-03 00:34:39 +00005071 SearchDC = DC;
Argyrios Kyrtzidis0f84a232008-11-09 22:53:32 +00005072 // Look-up name inside 'foo::'.
John McCall68263142009-11-18 22:49:29 +00005073 LookupQualifiedName(Previous, DC);
John McCall6e247262009-10-10 05:48:19 +00005074
John McCall68263142009-11-18 22:49:29 +00005075 if (Previous.isAmbiguous())
John McCall6e247262009-10-10 05:48:19 +00005076 return DeclPtrTy();
John McCall6e247262009-10-10 05:48:19 +00005077
John McCall68263142009-11-18 22:49:29 +00005078 if (Previous.empty()) {
Douglas Gregor9edad9b2010-01-14 17:47:39 +00005079 // Name lookup did not find anything. However, if the
5080 // nested-name-specifier refers to the current instantiation,
5081 // and that current instantiation has any dependent base
5082 // classes, we might find something at instantiation time: treat
5083 // this as a dependent elaborated-type-specifier.
Douglas Gregor7d3f5762010-01-15 01:44:47 +00005084 if (Previous.wasNotFoundInCurrentInstantiation()) {
Douglas Gregor9edad9b2010-01-14 17:47:39 +00005085 IsDependent = true;
5086 return DeclPtrTy();
5087 }
5088
5089 // A tag 'foo::bar' must already exist.
Douglas Gregor1eabb7d2010-03-31 23:17:41 +00005090 Diag(NameLoc, diag::err_not_tag_in_scope)
5091 << Kind << Name << DC << SS.getRange();
Argyrios Kyrtzidis630c81b2008-11-09 22:09:58 +00005092 Name = 0;
Douglas Gregord0c87372009-05-27 17:30:49 +00005093 Invalid = true;
Argyrios Kyrtzidis630c81b2008-11-09 22:09:58 +00005094 goto CreateNewDecl;
5095 }
Chris Lattnercf79b012009-01-21 02:38:50 +00005096 } else if (Name) {
Argyrios Kyrtzidis630c81b2008-11-09 22:09:58 +00005097 // If this is a named struct, check to see if there was a previous forward
5098 // declaration or definition.
Douglas Gregor2a3009a2009-02-03 19:21:40 +00005099 // FIXME: We're looking into outer scopes here, even when we
5100 // shouldn't be. Doing so can result in ambiguities that we
5101 // shouldn't be diagnosing.
John McCall68263142009-11-18 22:49:29 +00005102 LookupName(Previous, S);
5103
5104 // Note: there used to be some attempt at recovery here.
5105 if (Previous.isAmbiguous())
5106 return DeclPtrTy();
Douglas Gregor72de6672009-01-08 20:45:30 +00005107
John McCall0f434ec2009-07-31 02:45:11 +00005108 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) {
Douglas Gregor72de6672009-01-08 20:45:30 +00005109 // FIXME: This makes sure that we ignore the contexts associated
5110 // with C structs, unions, and enums when looking for a matching
5111 // tag declaration or definition. See the similar lookup tweak
Douglas Gregor4c921ae2009-01-30 01:04:22 +00005112 // in Sema::LookupName; is there a better way to deal with this?
Douglas Gregor4920f1f2009-01-12 22:49:06 +00005113 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC))
5114 SearchDC = SearchDC->getParent();
Douglas Gregor72de6672009-01-08 20:45:30 +00005115 }
Argyrios Kyrtzidis630c81b2008-11-09 22:09:58 +00005116 }
5117
John McCall68263142009-11-18 22:49:29 +00005118 if (Previous.isSingleResult() &&
5119 Previous.getFoundDecl()->isTemplateParameter()) {
Douglas Gregor72c3f312008-12-05 18:15:24 +00005120 // Maybe we will complain about the shadowed template parameter.
John McCall68263142009-11-18 22:49:29 +00005121 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl());
Douglas Gregor72c3f312008-12-05 18:15:24 +00005122 // Just pretend that we didn't see the previous declaration.
John McCall68263142009-11-18 22:49:29 +00005123 Previous.clear();
Douglas Gregor72c3f312008-12-05 18:15:24 +00005124 }
5125
Douglas Gregor7adb10f2009-09-15 22:30:29 +00005126 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace &&
5127 DC->Equals(StdNamespace) && Name->isStr("bad_alloc")) {
5128 // This is a declaration of or a reference to "std::bad_alloc".
5129 isStdBadAlloc = true;
5130
John McCall68263142009-11-18 22:49:29 +00005131 if (Previous.empty() && StdBadAlloc) {
Douglas Gregor7adb10f2009-09-15 22:30:29 +00005132 // std::bad_alloc has been implicitly declared (but made invisible to
5133 // name lookup). Fill in this implicit declaration as the previous
5134 // declaration, so that the declarations get chained appropriately.
John McCall68263142009-11-18 22:49:29 +00005135 Previous.addDecl(StdBadAlloc);
Douglas Gregor7adb10f2009-09-15 22:30:29 +00005136 }
5137 }
John McCall68263142009-11-18 22:49:29 +00005138
John McCall9c86b512010-03-25 21:28:06 +00005139 // If we didn't find a previous declaration, and this is a reference
5140 // (or friend reference), move to the correct scope. In C++, we
5141 // also need to do a redeclaration lookup there, just in case
5142 // there's a shadow friend decl.
5143 if (Name && Previous.empty() &&
5144 (TUK == TUK_Reference || TUK == TUK_Friend)) {
5145 if (Invalid) goto CreateNewDecl;
5146 assert(SS.isEmpty());
5147
5148 if (TUK == TUK_Reference) {
5149 // C++ [basic.scope.pdecl]p5:
5150 // -- for an elaborated-type-specifier of the form
5151 //
5152 // class-key identifier
5153 //
5154 // if the elaborated-type-specifier is used in the
5155 // decl-specifier-seq or parameter-declaration-clause of a
5156 // function defined in namespace scope, the identifier is
5157 // declared as a class-name in the namespace that contains
5158 // the declaration; otherwise, except as a friend
5159 // declaration, the identifier is declared in the smallest
5160 // non-class, non-function-prototype scope that contains the
5161 // declaration.
5162 //
5163 // C99 6.7.2.3p8 has a similar (but not identical!) provision for
5164 // C structs and unions.
5165 //
5166 // It is an error in C++ to declare (rather than define) an enum
5167 // type, including via an elaborated type specifier. We'll
5168 // diagnose that later; for now, declare the enum in the same
5169 // scope as we would have picked for any other tag type.
5170 //
5171 // GNU C also supports this behavior as part of its incomplete
5172 // enum types extension, while GNU C++ does not.
5173 //
5174 // Find the context where we'll be declaring the tag.
5175 // FIXME: We would like to maintain the current DeclContext as the
5176 // lexical context,
5177 while (SearchDC->isRecord())
5178 SearchDC = SearchDC->getParent();
5179
5180 // Find the scope where we'll be declaring the tag.
5181 while (S->isClassScope() ||
5182 (getLangOptions().CPlusPlus &&
5183 S->isFunctionPrototypeScope()) ||
5184 ((S->getFlags() & Scope::DeclScope) == 0) ||
5185 (S->getEntity() &&
5186 ((DeclContext *)S->getEntity())->isTransparentContext()))
5187 S = S->getParent();
5188 } else {
5189 assert(TUK == TUK_Friend);
5190 // C++ [namespace.memdef]p3:
5191 // If a friend declaration in a non-local class first declares a
5192 // class or function, the friend class or function is a member of
5193 // the innermost enclosing namespace.
5194 SearchDC = SearchDC->getEnclosingNamespaceContext();
John McCall9c86b512010-03-25 21:28:06 +00005195 }
5196
John McCall0d6b1642010-04-23 18:46:30 +00005197 // In C++, we need to do a redeclaration lookup to properly
5198 // diagnose some problems.
John McCall9c86b512010-03-25 21:28:06 +00005199 if (getLangOptions().CPlusPlus) {
5200 Previous.setRedeclarationKind(ForRedeclaration);
5201 LookupQualifiedName(Previous, SearchDC);
5202 }
5203 }
5204
John McCall68263142009-11-18 22:49:29 +00005205 if (!Previous.empty()) {
Douglas Gregor57265e32010-04-12 16:00:01 +00005206 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl();
John McCall0d6b1642010-04-23 18:46:30 +00005207
5208 // It's okay to have a tag decl in the same scope as a typedef
5209 // which hides a tag decl in the same scope. Finding this
5210 // insanity with a redeclaration lookup can only actually happen
5211 // in C++.
5212 //
5213 // This is also okay for elaborated-type-specifiers, which is
5214 // technically forbidden by the current standard but which is
5215 // okay according to the likely resolution of an open issue;
5216 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407
5217 if (getLangOptions().CPlusPlus) {
5218 if (TypedefDecl *TD = dyn_cast<TypedefDecl>(PrevDecl)) {
5219 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) {
5220 TagDecl *Tag = TT->getDecl();
5221 if (Tag->getDeclName() == Name &&
Douglas Gregorc8fd2da2010-04-27 16:26:47 +00005222 Tag->getDeclContext()->getLookupContext()
5223 ->Equals(TD->getDeclContext()->getLookupContext())) {
John McCall0d6b1642010-04-23 18:46:30 +00005224 PrevDecl = Tag;
5225 Previous.clear();
5226 Previous.addDecl(Tag);
5227 }
5228 }
5229 }
5230 }
5231
Argyrios Kyrtzidis2d1c5d32008-04-27 13:50:30 +00005232 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) {
Chris Lattner14943b92008-07-03 03:30:58 +00005233 // If this is a use of a previous tag, or if the tag is already declared
5234 // in the same scope (so that the definition/declaration completes or
Argyrios Kyrtzidis2d1c5d32008-04-27 13:50:30 +00005235 // rementions the tag), reuse the decl.
John McCall67d1a672009-08-06 02:15:43 +00005236 if (TUK == TUK_Reference || TUK == TUK_Friend ||
5237 isDeclInScope(PrevDecl, SearchDC, S)) {
Chris Lattner14943b92008-07-03 03:30:58 +00005238 // Make sure that this wasn't declared as an enum and now used as a
5239 // struct or something similar.
Douglas Gregor501c5ce2009-05-14 16:41:31 +00005240 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) {
Mike Stump1eb44332009-09-09 15:08:12 +00005241 bool SafeToContinue
Abramo Bagnara465d41b2010-05-11 21:36:43 +00005242 = (PrevTagDecl->getTagKind() != TTK_Enum &&
5243 Kind != TTK_Enum);
Douglas Gregora3a83512009-04-01 23:51:29 +00005244 if (SafeToContinue)
Mike Stump1eb44332009-09-09 15:08:12 +00005245 Diag(KWLoc, diag::err_use_with_wrong_tag)
Douglas Gregora3a83512009-04-01 23:51:29 +00005246 << Name
Douglas Gregor849b2432010-03-31 17:46:05 +00005247 << FixItHint::CreateReplacement(SourceRange(KWLoc),
5248 PrevTagDecl->getKindName());
Douglas Gregora3a83512009-04-01 23:51:29 +00005249 else
5250 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name;
John McCall68263142009-11-18 22:49:29 +00005251 Diag(PrevTagDecl->getLocation(), diag::note_previous_use);
Douglas Gregora3a83512009-04-01 23:51:29 +00005252
Mike Stump1eb44332009-09-09 15:08:12 +00005253 if (SafeToContinue)
Douglas Gregora3a83512009-04-01 23:51:29 +00005254 Kind = PrevTagDecl->getTagKind();
5255 else {
5256 // Recover by making this an anonymous redefinition.
5257 Name = 0;
John McCall68263142009-11-18 22:49:29 +00005258 Previous.clear();
Douglas Gregora3a83512009-04-01 23:51:29 +00005259 Invalid = true;
5260 }
5261 }
5262
5263 if (!Invalid) {
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005264 // If this is a use, just return the declaration we found.
Chris Lattner14943b92008-07-03 03:30:58 +00005265
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005266 // FIXME: In the future, return a variant or some other clue
5267 // for the consumer of this Decl to know it doesn't own it.
5268 // For our current ASTs this shouldn't be a problem, but will
5269 // need to be changed with DeclGroups.
Douglas Gregore1aa9f32010-06-08 21:27:36 +00005270 if ((TUK == TUK_Reference && !PrevTagDecl->getFriendObjectKind()) ||
5271 TUK == TUK_Friend)
John McCall68263142009-11-18 22:49:29 +00005272 return DeclPtrTy::make(PrevTagDecl);
Douglas Gregoraaba5e32009-02-04 19:02:06 +00005273
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005274 // Diagnose attempts to redefine a tag.
John McCall0f434ec2009-07-31 02:45:11 +00005275 if (TUK == TUK_Definition) {
Douglas Gregor952b0172010-02-11 01:04:33 +00005276 if (TagDecl *Def = PrevTagDecl->getDefinition()) {
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005277 // If we're defining a specialization and the previous definition
5278 // is from an implicit instantiation, don't emit an error
5279 // here; we'll catch this in the general case below.
5280 if (!isExplicitSpecialization ||
5281 !isa<CXXRecordDecl>(Def) ||
5282 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind()
5283 == TSK_ExplicitSpecialization) {
5284 Diag(NameLoc, diag::err_redefinition) << Name;
5285 Diag(Def->getLocation(), diag::note_previous_definition);
5286 // If this is a redefinition, recover by making this
5287 // struct be anonymous, which will make any later
5288 // references get the previous definition.
5289 Name = 0;
John McCall68263142009-11-18 22:49:29 +00005290 Previous.clear();
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005291 Invalid = true;
5292 }
Douglas Gregor0b7a1582009-01-17 00:42:38 +00005293 } else {
5294 // If the type is currently being defined, complain
5295 // about a nested redefinition.
5296 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl));
5297 if (Tag->isBeingDefined()) {
5298 Diag(NameLoc, diag::err_nested_redefinition) << Name;
Mike Stump1eb44332009-09-09 15:08:12 +00005299 Diag(PrevTagDecl->getLocation(),
Douglas Gregor0b7a1582009-01-17 00:42:38 +00005300 diag::note_previous_definition);
5301 Name = 0;
John McCall68263142009-11-18 22:49:29 +00005302 Previous.clear();
Douglas Gregor0b7a1582009-01-17 00:42:38 +00005303 Invalid = true;
5304 }
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005305 }
Douglas Gregor0b7a1582009-01-17 00:42:38 +00005306
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005307 // Okay, this is definition of a previously declared or referenced
5308 // tag PrevDecl. We're going to create a new Decl for it.
Douglas Gregor0b7a1582009-01-17 00:42:38 +00005309 }
Argyrios Kyrtzidis2d1c5d32008-04-27 13:50:30 +00005310 }
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005311 // If we get here we have (another) forward declaration or we
John McCall67d1a672009-08-06 02:15:43 +00005312 // have a definition. Just create a new decl.
5313
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005314 } else {
5315 // If we get here, this is a definition of a new tag type in a nested
Mike Stump1eb44332009-09-09 15:08:12 +00005316 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005317 // new decl/type. We set PrevDecl to NULL so that the entities
5318 // have distinct types.
John McCall68263142009-11-18 22:49:29 +00005319 Previous.clear();
Reid Spencer5f016e22007-07-11 17:01:13 +00005320 }
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005321 // If we get here, we're going to create a new Decl. If PrevDecl
5322 // is non-NULL, it's a definition of the tag declared by
5323 // PrevDecl. If it's NULL, we have a new definition.
John McCall0d6b1642010-04-23 18:46:30 +00005324
5325
5326 // Otherwise, PrevDecl is not a tag, but was found with tag
5327 // lookup. This is only actually possible in C++, where a few
5328 // things like templates still live in the tag namespace.
Argyrios Kyrtzidis2d1c5d32008-04-27 13:50:30 +00005329 } else {
John McCall0d6b1642010-04-23 18:46:30 +00005330 assert(getLangOptions().CPlusPlus);
5331
5332 // Use a better diagnostic if an elaborated-type-specifier
5333 // found the wrong kind of type on the first
5334 // (non-redeclaration) lookup.
5335 if ((TUK == TUK_Reference || TUK == TUK_Friend) &&
5336 !Previous.isForRedeclaration()) {
5337 unsigned Kind = 0;
5338 if (isa<TypedefDecl>(PrevDecl)) Kind = 1;
5339 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2;
5340 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind;
5341 Diag(PrevDecl->getLocation(), diag::note_declared_at);
5342 Invalid = true;
5343
5344 // Otherwise, only diagnose if the declaration is in scope.
5345 } else if (!isDeclInScope(PrevDecl, SearchDC, S)) {
5346 // do nothing
5347
5348 // Diagnose implicit declarations introduced by elaborated types.
5349 } else if (TUK == TUK_Reference || TUK == TUK_Friend) {
5350 unsigned Kind = 0;
5351 if (isa<TypedefDecl>(PrevDecl)) Kind = 1;
5352 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2;
5353 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind;
5354 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl;
5355 Invalid = true;
5356
5357 // Otherwise it's a declaration. Call out a particularly common
5358 // case here.
5359 } else if (isa<TypedefDecl>(PrevDecl)) {
5360 Diag(NameLoc, diag::err_tag_definition_of_typedef)
5361 << Name
5362 << cast<TypedefDecl>(PrevDecl)->getUnderlyingType();
5363 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl;
5364 Invalid = true;
5365
5366 // Otherwise, diagnose.
5367 } else {
5368 // The tag name clashes with something else in the target scope,
5369 // issue an error and recover by making this tag be anonymous.
Chris Lattner3c73c412008-11-19 08:23:25 +00005370 Diag(NameLoc, diag::err_redefinition_different_kind) << Name;
Chris Lattner5f4a6822008-11-23 23:12:31 +00005371 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
Argyrios Kyrtzidisb02ef242008-07-16 07:45:46 +00005372 Name = 0;
Douglas Gregor0b7a1582009-01-17 00:42:38 +00005373 Invalid = true;
Argyrios Kyrtzidisb02ef242008-07-16 07:45:46 +00005374 }
John McCall0d6b1642010-04-23 18:46:30 +00005375
5376 // The existing declaration isn't relevant to us; we're in a
5377 // new scope, so clear out the previous declaration.
5378 Previous.clear();
Reid Spencer5f016e22007-07-11 17:01:13 +00005379 }
Reid Spencer5f016e22007-07-11 17:01:13 +00005380 }
Argyrios Kyrtzidisef6e6472008-11-08 17:17:31 +00005381
Chris Lattnercc98eac2008-12-17 07:13:27 +00005382CreateNewDecl:
Mike Stump1eb44332009-09-09 15:08:12 +00005383
John McCall68263142009-11-18 22:49:29 +00005384 TagDecl *PrevDecl = 0;
5385 if (Previous.isSingleResult())
5386 PrevDecl = cast<TagDecl>(Previous.getFoundDecl());
5387
Reid Spencer5f016e22007-07-11 17:01:13 +00005388 // If there is an identifier, use the location of the identifier as the
5389 // location of the decl, otherwise use the location of the struct/union
5390 // keyword.
5391 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc;
Mike Stump1eb44332009-09-09 15:08:12 +00005392
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005393 // Otherwise, create a new declaration. If there is a previous
5394 // declaration of the same entity, the two will be linked via
5395 // PrevDecl.
Reid Spencer5f016e22007-07-11 17:01:13 +00005396 TagDecl *New;
Douglas Gregorbcbffc42009-01-07 00:43:41 +00005397
Abramo Bagnara465d41b2010-05-11 21:36:43 +00005398 if (Kind == TTK_Enum) {
Reid Spencer5f016e22007-07-11 17:01:13 +00005399 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.:
5400 // enum X { A, B, C } D; D should chain to X.
Douglas Gregor741dd9a2009-07-21 14:46:17 +00005401 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc,
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005402 cast_or_null<EnumDecl>(PrevDecl));
Reid Spencer5f016e22007-07-11 17:01:13 +00005403 // If this is an undefined enum, warn.
Douglas Gregorf3a7b7c2010-06-22 14:26:35 +00005404 if (TUK != TUK_Definition && !Invalid) {
5405 TagDecl *Def;
5406 if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) {
5407 Diag(Loc, diag::ext_forward_ref_enum_def)
5408 << New;
5409 Diag(Def->getLocation(), diag::note_previous_definition);
5410 } else {
5411 Diag(Loc,
5412 getLangOptions().CPlusPlus? diag::err_forward_ref_enum
5413 : diag::ext_forward_ref_enum);
5414 }
Douglas Gregor80711a22009-03-06 18:34:03 +00005415 }
Argyrios Kyrtzidis39ba4ae2008-06-09 23:19:58 +00005416 } else {
5417 // struct/union/class
5418
Reid Spencer5f016e22007-07-11 17:01:13 +00005419 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.:
5420 // struct X { int A; } D; D should chain to X.
Douglas Gregor7adb10f2009-09-15 22:30:29 +00005421 if (getLangOptions().CPlusPlus) {
Ted Kremenek2b345eb2008-09-05 17:39:33 +00005422 // FIXME: Look for a way to use RecordDecl for simple structs.
Douglas Gregor741dd9a2009-07-21 14:46:17 +00005423 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc,
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005424 cast_or_null<CXXRecordDecl>(PrevDecl));
Douglas Gregor7adb10f2009-09-15 22:30:29 +00005425
5426 if (isStdBadAlloc && (!StdBadAlloc || StdBadAlloc->isImplicit()))
5427 StdBadAlloc = cast<CXXRecordDecl>(New);
5428 } else
Douglas Gregor741dd9a2009-07-21 14:46:17 +00005429 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc,
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005430 cast_or_null<RecordDecl>(PrevDecl));
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +00005431 }
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005432
John McCallb6217662010-03-15 10:12:16 +00005433 // Maybe add qualifier info.
5434 if (SS.isNotEmpty()) {
Fariborz Jahanian4fb20532010-05-14 21:35:02 +00005435 if (SS.isSet()) {
5436 NestedNameSpecifier *NNS
5437 = static_cast<NestedNameSpecifier*>(SS.getScopeRep());
5438 New->setQualifierInfo(NNS, SS.getRange());
Abramo Bagnara9b934882010-06-12 08:15:14 +00005439 if (NumMatchedTemplateParamLists > 0) {
Douglas Gregorc722ea42010-06-15 17:44:38 +00005440 New->setTemplateParameterListsInfo(Context,
5441 NumMatchedTemplateParamLists,
Abramo Bagnara9b934882010-06-12 08:15:14 +00005442 (TemplateParameterList**) TemplateParameterLists.release());
5443 }
Fariborz Jahanian4fb20532010-05-14 21:35:02 +00005444 }
5445 else
5446 Invalid = true;
John McCallb6217662010-03-15 10:12:16 +00005447 }
5448
Daniel Dunbar9f21f892010-05-27 01:53:40 +00005449 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) {
5450 // Add alignment attributes if necessary; these attributes are checked when
5451 // the ASTContext lays out the structure.
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005452 //
5453 // It is important for implementing the correct semantics that this
5454 // happen here (in act on tag decl). The #pragma pack stack is
5455 // maintained as a result of parser callbacks which can occur at
5456 // many points during the parsing of a struct declaration (because
5457 // the #pragma tokens are effectively skipped over during the
5458 // parsing of the struct).
Daniel Dunbar9f21f892010-05-27 01:53:40 +00005459 AddAlignmentAttributesForRecord(RD);
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005460 }
5461
Douglas Gregorf6b11852009-10-08 15:14:33 +00005462 // If this is a specialization of a member class (of a class template),
5463 // check the specialization.
John McCall68263142009-11-18 22:49:29 +00005464 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous))
Douglas Gregorf6b11852009-10-08 15:14:33 +00005465 Invalid = true;
Daniel Dunbar9f21f892010-05-27 01:53:40 +00005466
Douglas Gregor0b7a1582009-01-17 00:42:38 +00005467 if (Invalid)
5468 New->setInvalidDecl();
5469
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005470 if (Attr)
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00005471 ProcessDeclAttributeList(S, New, Attr);
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005472
Douglas Gregor0b7a1582009-01-17 00:42:38 +00005473 // If we're declaring or defining a tag in function prototype scope
5474 // in C, note that this type can only be used within the function.
Douglas Gregor3218c4b2009-01-09 22:42:13 +00005475 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus)
5476 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New);
5477
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005478 // Set the lexical context. If the tag has a C++ scope specifier, the
5479 // lexical context will be different from the semantic context.
Douglas Gregor1931b442009-02-03 00:34:39 +00005480 New->setLexicalDeclContext(CurContext);
Douglas Gregor0b7a1582009-01-17 00:42:38 +00005481
John McCall02cace72009-08-28 07:59:38 +00005482 // Mark this as a friend decl if applicable.
5483 if (TUK == TUK_Friend)
John McCall68263142009-11-18 22:49:29 +00005484 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty());
John McCall02cace72009-08-28 07:59:38 +00005485
Anders Carlsson0cf88302009-03-26 01:19:02 +00005486 // Set the access specifier.
John McCall9c86b512010-03-25 21:28:06 +00005487 if (!Invalid && SearchDC->isRecord())
Douglas Gregord0c87372009-05-27 17:30:49 +00005488 SetMemberAccessSpecifier(New, PrevDecl, AS);
Douglas Gregor06c0fec2009-03-25 22:00:53 +00005489
John McCall0f434ec2009-07-31 02:45:11 +00005490 if (TUK == TUK_Definition)
Douglas Gregor0b7a1582009-01-17 00:42:38 +00005491 New->startDefinition();
Mike Stump1eb44332009-09-09 15:08:12 +00005492
Reid Spencer5f016e22007-07-11 17:01:13 +00005493 // If this has an identifier, add it to the scope stack.
John McCalld7eff682009-09-02 00:55:30 +00005494 if (TUK == TUK_Friend) {
John McCall82b9fb82009-09-02 19:32:14 +00005495 // We might be replacing an existing declaration in the lookup tables;
5496 // if so, borrow its access specifier.
5497 if (PrevDecl)
5498 New->setAccess(PrevDecl->getAccess());
5499
John McCall9c86b512010-03-25 21:28:06 +00005500 DeclContext *DC = New->getDeclContext()->getLookupContext();
5501 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false);
5502 if (Name) // can be null along some error paths
John McCalld7eff682009-09-02 00:55:30 +00005503 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
5504 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false);
John McCalld7eff682009-09-02 00:55:30 +00005505 } else if (Name) {
Douglas Gregor1a0d31a2009-01-12 18:45:55 +00005506 S = getNonFieldDeclScope(S);
Douglas Gregor1931b442009-02-03 00:34:39 +00005507 PushOnScopeChains(New, S);
Douglas Gregor4920f1f2009-01-12 22:49:06 +00005508 } else {
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00005509 CurContext->addDecl(New);
Reid Spencer5f016e22007-07-11 17:01:13 +00005510 }
Argyrios Kyrtzidis52393042008-11-09 23:41:00 +00005511
Douglas Gregorc29f77b2009-07-07 16:35:42 +00005512 // If this is the C FILE type, notify the AST context.
5513 if (IdentifierInfo *II = New->getIdentifier())
5514 if (!New->isInvalidDecl() &&
Mike Stump782fa302009-07-28 02:25:19 +00005515 New->getDeclContext()->getLookupContext()->isTranslationUnit() &&
Douglas Gregorc29f77b2009-07-07 16:35:42 +00005516 II->isStr("FILE"))
5517 Context.setFILEDecl(New);
Mike Stump1eb44332009-09-09 15:08:12 +00005518
Douglas Gregor402abb52009-05-28 23:31:59 +00005519 OwnedDecl = true;
Chris Lattnerb28317a2009-03-28 19:18:32 +00005520 return DeclPtrTy::make(New);
Reid Spencer5f016e22007-07-11 17:01:13 +00005521}
5522
Chris Lattnerb28317a2009-03-28 19:18:32 +00005523void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) {
Douglas Gregoraaba5e32009-02-04 19:02:06 +00005524 AdjustDeclIfTemplate(TagD);
Chris Lattnerb28317a2009-03-28 19:18:32 +00005525 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>());
Douglas Gregor48c89f42010-04-24 16:38:41 +00005526
Douglas Gregor72de6672009-01-08 20:45:30 +00005527 // Enter the tag context.
5528 PushDeclContext(S, Tag);
John McCallf9368152009-12-20 07:58:13 +00005529}
Douglas Gregor72de6672009-01-08 20:45:30 +00005530
John McCallf9368152009-12-20 07:58:13 +00005531void Sema::ActOnStartCXXMemberDeclarations(Scope *S, DeclPtrTy TagD,
5532 SourceLocation LBraceLoc) {
5533 AdjustDeclIfTemplate(TagD);
5534 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD.getAs<Decl>());
Douglas Gregor72de6672009-01-08 20:45:30 +00005535
John McCallf9368152009-12-20 07:58:13 +00005536 FieldCollector->StartClass();
5537
5538 if (!Record->getIdentifier())
5539 return;
5540
5541 // C++ [class]p2:
5542 // [...] The class-name is also inserted into the scope of the
5543 // class itself; this is known as the injected-class-name. For
5544 // purposes of access checking, the injected-class-name is treated
5545 // as if it were a public member name.
5546 CXXRecordDecl *InjectedClassName
5547 = CXXRecordDecl::Create(Context, Record->getTagKind(),
5548 CurContext, Record->getLocation(),
5549 Record->getIdentifier(),
5550 Record->getTagKeywordLoc(),
5551 Record);
5552 InjectedClassName->setImplicit();
5553 InjectedClassName->setAccess(AS_public);
5554 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate())
5555 InjectedClassName->setDescribedClassTemplate(Template);
5556 PushOnScopeChains(InjectedClassName, S);
5557 assert(InjectedClassName->isInjectedClassName() &&
5558 "Broken injected-class-name");
Douglas Gregor72de6672009-01-08 20:45:30 +00005559}
5560
Argyrios Kyrtzidis07a5b282009-07-14 03:17:52 +00005561void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD,
5562 SourceLocation RBraceLoc) {
Douglas Gregoraaba5e32009-02-04 19:02:06 +00005563 AdjustDeclIfTemplate(TagD);
Chris Lattnerb28317a2009-03-28 19:18:32 +00005564 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>());
Argyrios Kyrtzidis07a5b282009-07-14 03:17:52 +00005565 Tag->setRBraceLoc(RBraceLoc);
Douglas Gregor72de6672009-01-08 20:45:30 +00005566
5567 if (isa<CXXRecordDecl>(Tag))
5568 FieldCollector->FinishClass();
5569
5570 // Exit this scope of this tag's definition.
5571 PopDeclContext();
Douglas Gregoradda8462010-01-06 17:00:51 +00005572
Douglas Gregor72de6672009-01-08 20:45:30 +00005573 // Notify the consumer that we've defined a tag.
5574 Consumer.HandleTagDeclDefinition(Tag);
5575}
Chris Lattner5a6ddbf2008-06-21 19:39:06 +00005576
John McCalldb7bb4a2010-03-17 00:38:33 +00005577void Sema::ActOnTagDefinitionError(Scope *S, DeclPtrTy TagD) {
5578 AdjustDeclIfTemplate(TagD);
5579 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>());
John McCalldb7bb4a2010-03-17 00:38:33 +00005580 Tag->setInvalidDecl();
5581
John McCalla8cab012010-03-17 19:25:57 +00005582 // We're undoing ActOnTagStartDefinition here, not
5583 // ActOnStartCXXMemberDeclarations, so we don't have to mess with
5584 // the FieldCollector.
John McCalldb7bb4a2010-03-17 00:38:33 +00005585
5586 PopDeclContext();
5587}
5588
Chris Lattnerdf9bcd52009-04-20 17:29:38 +00005589// Note that FieldName may be null for anonymous bitfields.
Mike Stump1eb44332009-09-09 15:08:12 +00005590bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName,
Eli Friedman1d954f62009-08-15 21:55:26 +00005591 QualType FieldTy, const Expr *BitWidth,
5592 bool *ZeroWidth) {
5593 // Default to true; that shouldn't confuse checks for emptiness
5594 if (ZeroWidth)
5595 *ZeroWidth = true;
5596
Chris Lattner24793662009-03-05 22:45:59 +00005597 // C99 6.7.2.1p4 - verify the field type.
Chris Lattner8b963ef2009-03-05 23:01:03 +00005598 // C++ 9.6p3: A bit-field shall have integral or enumeration type.
Douglas Gregor2ade35e2010-06-16 00:17:44 +00005599 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) {
Chris Lattner24793662009-03-05 22:45:59 +00005600 // Handle incomplete types with specific error.
Douglas Gregora03aca82009-03-10 21:58:27 +00005601 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete))
5602 return true;
Chris Lattnerdf9bcd52009-04-20 17:29:38 +00005603 if (FieldName)
5604 return Diag(FieldLoc, diag::err_not_integral_type_bitfield)
5605 << FieldName << FieldTy << BitWidth->getSourceRange();
5606 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield)
5607 << FieldTy << BitWidth->getSourceRange();
Chris Lattner24793662009-03-05 22:45:59 +00005608 }
Douglas Gregor3cf538d2009-03-11 18:59:21 +00005609
5610 // If the bit-width is type- or value-dependent, don't try to check
5611 // it now.
5612 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent())
5613 return false;
5614
Anders Carlsson9f1e5722008-12-06 20:33:04 +00005615 llvm::APSInt Value;
5616 if (VerifyIntegerConstantExpression(BitWidth, &Value))
5617 return true;
5618
Eli Friedman1d954f62009-08-15 21:55:26 +00005619 if (Value != 0 && ZeroWidth)
5620 *ZeroWidth = false;
5621
Chris Lattnercd087072008-12-12 04:56:04 +00005622 // Zero-width bitfield is ok for anonymous field.
5623 if (Value == 0 && FieldName)
5624 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName;
Mike Stump1eb44332009-09-09 15:08:12 +00005625
Chris Lattnerdf9bcd52009-04-20 17:29:38 +00005626 if (Value.isSigned() && Value.isNegative()) {
5627 if (FieldName)
Mike Stump1eb44332009-09-09 15:08:12 +00005628 return Diag(FieldLoc, diag::err_bitfield_has_negative_width)
Chris Lattnerdf9bcd52009-04-20 17:29:38 +00005629 << FieldName << Value.toString(10);
5630 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width)
5631 << Value.toString(10);
5632 }
Anders Carlsson9f1e5722008-12-06 20:33:04 +00005633
Douglas Gregor3cf538d2009-03-11 18:59:21 +00005634 if (!FieldTy->isDependentType()) {
5635 uint64_t TypeSize = Context.getTypeSize(FieldTy);
Chris Lattnerdf9bcd52009-04-20 17:29:38 +00005636 if (Value.getZExtValue() > TypeSize) {
Anders Carlsson72468ec2010-04-16 15:16:32 +00005637 if (!getLangOptions().CPlusPlus) {
5638 if (FieldName)
5639 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size)
5640 << FieldName << (unsigned)Value.getZExtValue()
5641 << (unsigned)TypeSize;
5642
5643 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size)
5644 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize;
5645 }
5646
Chris Lattnerdf9bcd52009-04-20 17:29:38 +00005647 if (FieldName)
Anders Carlsson72468ec2010-04-16 15:16:32 +00005648 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size)
5649 << FieldName << (unsigned)Value.getZExtValue()
5650 << (unsigned)TypeSize;
5651 else
5652 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size)
5653 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize;
Chris Lattnerdf9bcd52009-04-20 17:29:38 +00005654 }
Douglas Gregor3cf538d2009-03-11 18:59:21 +00005655 }
Anders Carlsson9f1e5722008-12-06 20:33:04 +00005656
5657 return false;
5658}
5659
Steve Naroff08d92e42007-09-15 18:49:24 +00005660/// ActOnField - Each field of a struct/union/class is passed into this in order
Reid Spencer5f016e22007-07-11 17:01:13 +00005661/// to create a FieldDecl object for it.
Chris Lattnerb28317a2009-03-28 19:18:32 +00005662Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD,
Mike Stump1eb44332009-09-09 15:08:12 +00005663 SourceLocation DeclStart,
Chris Lattnerb28317a2009-03-28 19:18:32 +00005664 Declarator &D, ExprTy *BitfieldWidth) {
5665 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()),
5666 DeclStart, D, static_cast<Expr*>(BitfieldWidth),
5667 AS_public);
5668 return DeclPtrTy::make(Res);
Chris Lattner24793662009-03-05 22:45:59 +00005669}
5670
5671/// HandleField - Analyze a field of a C struct or a C++ data member.
5672///
5673FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record,
5674 SourceLocation DeclStart,
Douglas Gregor4dd55f52009-03-11 20:50:30 +00005675 Declarator &D, Expr *BitWidth,
5676 AccessSpecifier AS) {
Reid Spencer5f016e22007-07-11 17:01:13 +00005677 IdentifierInfo *II = D.getIdentifier();
Reid Spencer5f016e22007-07-11 17:01:13 +00005678 SourceLocation Loc = DeclStart;
5679 if (II) Loc = D.getIdentifierLoc();
Mike Stump1eb44332009-09-09 15:08:12 +00005680
John McCallbf1a0282010-06-04 23:28:52 +00005681 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
5682 QualType T = TInfo->getType();
Chris Lattner6491f472009-04-12 22:15:02 +00005683 if (getLangOptions().CPlusPlus)
Douglas Gregor3cf538d2009-03-11 18:59:21 +00005684 CheckExtraCXXDefaultArguments(D);
Douglas Gregor021c3b32009-03-11 23:00:04 +00005685
Eli Friedman85a53192009-04-07 19:37:57 +00005686 DiagnoseFunctionSpecifiers(D);
5687
Eli Friedman63054b32009-04-19 20:27:55 +00005688 if (D.getDeclSpec().isThreadSpecified())
5689 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
5690
Douglas Gregorc83c6872010-04-15 22:33:43 +00005691 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName,
John McCall7d384dd2009-11-18 07:57:50 +00005692 ForRedeclaration);
Douglas Gregorc19ee3e2009-06-17 23:37:01 +00005693
5694 if (PrevDecl && PrevDecl->isTemplateParameter()) {
5695 // Maybe we will complain about the shadowed template parameter.
5696 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
5697 // Just pretend that we didn't see the previous declaration.
5698 PrevDecl = 0;
5699 }
5700
Douglas Gregor3cf538d2009-03-11 18:59:21 +00005701 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S))
5702 PrevDecl = 0;
5703
Steve Naroffea218b82009-07-14 14:58:18 +00005704 bool Mutable
5705 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable);
5706 SourceLocation TSSL = D.getSourceRange().getBegin();
5707 FieldDecl *NewFD
John McCalla93c9342009-12-07 02:54:59 +00005708 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL,
Steve Naroffea218b82009-07-14 14:58:18 +00005709 AS, PrevDecl, &D);
Rafael Espindola01620702010-03-21 22:56:43 +00005710
5711 if (NewFD->isInvalidDecl())
5712 Record->setInvalidDecl();
5713
Douglas Gregor3cf538d2009-03-11 18:59:21 +00005714 if (NewFD->isInvalidDecl() && PrevDecl) {
5715 // Don't introduce NewFD into scope; there's already something
5716 // with the same name in the same scope.
5717 } else if (II) {
5718 PushOnScopeChains(NewFD, S);
5719 } else
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00005720 Record->addDecl(NewFD);
Douglas Gregor3cf538d2009-03-11 18:59:21 +00005721
5722 return NewFD;
5723}
5724
5725/// \brief Build a new FieldDecl and check its well-formedness.
5726///
5727/// This routine builds a new FieldDecl given the fields name, type,
5728/// record, etc. \p PrevDecl should refer to any previous declaration
5729/// with the same name and in the same scope as the field to be
5730/// created.
5731///
5732/// \returns a new FieldDecl.
5733///
Mike Stump1eb44332009-09-09 15:08:12 +00005734/// \todo The Declarator argument is a hack. It will be removed once
Argyrios Kyrtzidisa1d56622009-08-19 01:27:57 +00005735FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T,
John McCalla93c9342009-12-07 02:54:59 +00005736 TypeSourceInfo *TInfo,
Douglas Gregor3cf538d2009-03-11 18:59:21 +00005737 RecordDecl *Record, SourceLocation Loc,
Mike Stump1eb44332009-09-09 15:08:12 +00005738 bool Mutable, Expr *BitWidth,
Steve Naroffea218b82009-07-14 14:58:18 +00005739 SourceLocation TSSL,
Douglas Gregor4dd55f52009-03-11 20:50:30 +00005740 AccessSpecifier AS, NamedDecl *PrevDecl,
Douglas Gregor3cf538d2009-03-11 18:59:21 +00005741 Declarator *D) {
5742 IdentifierInfo *II = Name.getAsIdentifierInfo();
Steve Naroff5912a352007-08-28 20:14:24 +00005743 bool InvalidDecl = false;
Chris Lattnereaaebc72009-04-25 08:06:05 +00005744 if (D) InvalidDecl = D->isInvalidType();
Sebastian Redl64b45f72009-01-05 20:52:13 +00005745
Douglas Gregor3cf538d2009-03-11 18:59:21 +00005746 // If we receive a broken type, recover by assuming 'int' and
5747 // marking this declaration as invalid.
5748 if (T.isNull()) {
5749 InvalidDecl = true;
5750 T = Context.IntTy;
5751 }
5752
Eli Friedman721e77d2009-12-07 00:22:08 +00005753 QualType EltTy = Context.getBaseElementType(T);
5754 if (!EltTy->isDependentType() &&
5755 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete))
5756 InvalidDecl = true;
5757
Reid Spencer5f016e22007-07-11 17:01:13 +00005758 // C99 6.7.2.1p8: A member of a structure or union may have any type other
5759 // than a variably modified type.
Eli Friedman721e77d2009-12-07 00:22:08 +00005760 if (!InvalidDecl && T->isVariablyModifiedType()) {
Eli Friedman1ca48132009-02-21 00:44:51 +00005761 bool SizeIsNegative;
5762 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context,
5763 SizeIsNegative);
5764 if (!FixedTy.isNull()) {
5765 Diag(Loc, diag::warn_illegal_constant_array_size);
5766 T = FixedTy;
5767 } else {
5768 if (SizeIsNegative)
5769 Diag(Loc, diag::err_typecheck_negative_array_size);
5770 else
5771 Diag(Loc, diag::err_typecheck_field_variable_size);
Eli Friedman1ca48132009-02-21 00:44:51 +00005772 InvalidDecl = true;
5773 }
Reid Spencer5f016e22007-07-11 17:01:13 +00005774 }
Mike Stump1eb44332009-09-09 15:08:12 +00005775
Anders Carlsson4681ebd2009-03-22 20:18:17 +00005776 // Fields can not have abstract class types
Eli Friedman721e77d2009-12-07 00:22:08 +00005777 if (!InvalidDecl && RequireNonAbstractType(Loc, T,
5778 diag::err_abstract_type_in_decl,
5779 AbstractFieldType))
Anders Carlsson4681ebd2009-03-22 20:18:17 +00005780 InvalidDecl = true;
Mike Stump1eb44332009-09-09 15:08:12 +00005781
Eli Friedman1d954f62009-08-15 21:55:26 +00005782 bool ZeroWidth = false;
Douglas Gregor3cf538d2009-03-11 18:59:21 +00005783 // If this is declared as a bit-field, check the bit-field.
Eli Friedman721e77d2009-12-07 00:22:08 +00005784 if (!InvalidDecl && BitWidth &&
5785 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) {
Douglas Gregor3cf538d2009-03-11 18:59:21 +00005786 InvalidDecl = true;
5787 DeleteExpr(BitWidth);
5788 BitWidth = 0;
Eli Friedman1d954f62009-08-15 21:55:26 +00005789 ZeroWidth = false;
Anders Carlsson9f1e5722008-12-06 20:33:04 +00005790 }
Mike Stump1eb44332009-09-09 15:08:12 +00005791
John McCall4bde1e12010-06-04 08:34:12 +00005792 // Check that 'mutable' is consistent with the type of the declaration.
5793 if (!InvalidDecl && Mutable) {
5794 unsigned DiagID = 0;
5795 if (T->isReferenceType())
5796 DiagID = diag::err_mutable_reference;
5797 else if (T.isConstQualified())
5798 DiagID = diag::err_mutable_const;
5799
5800 if (DiagID) {
5801 SourceLocation ErrLoc = Loc;
5802 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid())
5803 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc();
5804 Diag(ErrLoc, DiagID);
5805 Mutable = false;
5806 InvalidDecl = true;
5807 }
5808 }
5809
John McCalla93c9342009-12-07 02:54:59 +00005810 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo,
Argyrios Kyrtzidisa5d82002009-08-21 00:31:54 +00005811 BitWidth, Mutable);
Chris Lattnereaaebc72009-04-25 08:06:05 +00005812 if (InvalidDecl)
5813 NewFD->setInvalidDecl();
Douglas Gregor44b43212008-12-11 16:49:14 +00005814
Douglas Gregor3cf538d2009-03-11 18:59:21 +00005815 if (PrevDecl && !isa<TagDecl>(PrevDecl)) {
5816 Diag(Loc, diag::err_duplicate_member) << II;
5817 Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
5818 NewFD->setInvalidDecl();
Douglas Gregor72de6672009-01-08 20:45:30 +00005819 }
5820
John McCall86ff3082010-02-04 22:26:26 +00005821 if (!InvalidDecl && getLangOptions().CPlusPlus) {
Eli Friedman1d954f62009-08-15 21:55:26 +00005822 CXXRecordDecl* CXXRecord = cast<CXXRecordDecl>(Record);
5823
5824 if (!T->isPODType())
5825 CXXRecord->setPOD(false);
5826 if (!ZeroWidth)
5827 CXXRecord->setEmpty(false);
5828
Ted Kremenek6217b802009-07-29 21:53:49 +00005829 if (const RecordType *RT = EltTy->getAs<RecordType>()) {
Douglas Gregor1f2023a2009-07-22 18:25:24 +00005830 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl());
Douglas Gregord27e50c2010-06-16 16:54:04 +00005831 if (RDecl->getDefinition()) {
5832 if (!RDecl->hasTrivialConstructor())
5833 CXXRecord->setHasTrivialConstructor(false);
Douglas Gregor1f2023a2009-07-22 18:25:24 +00005834 if (!RDecl->hasTrivialCopyConstructor())
Douglas Gregord27e50c2010-06-16 16:54:04 +00005835 CXXRecord->setHasTrivialCopyConstructor(false);
5836 if (!RDecl->hasTrivialCopyAssignment())
5837 CXXRecord->setHasTrivialCopyAssignment(false);
5838 if (!RDecl->hasTrivialDestructor())
5839 CXXRecord->setHasTrivialDestructor(false);
Douglas Gregor1f2023a2009-07-22 18:25:24 +00005840
Douglas Gregord27e50c2010-06-16 16:54:04 +00005841 // C++ 9.5p1: An object of a class with a non-trivial
5842 // constructor, a non-trivial copy constructor, a non-trivial
5843 // destructor, or a non-trivial copy assignment operator
5844 // cannot be a member of a union, nor can an array of such
5845 // objects.
5846 // TODO: C++0x alters this restriction significantly.
5847 if (Record->isUnion()) {
5848 // We check for copy constructors before constructors
5849 // because otherwise we'll never get complaints about
5850 // copy constructors.
5851
5852 CXXSpecialMember member = CXXInvalid;
5853 if (!RDecl->hasTrivialCopyConstructor())
5854 member = CXXCopyConstructor;
5855 else if (!RDecl->hasTrivialConstructor())
5856 member = CXXConstructor;
5857 else if (!RDecl->hasTrivialCopyAssignment())
5858 member = CXXCopyAssignment;
5859 else if (!RDecl->hasTrivialDestructor())
5860 member = CXXDestructor;
5861
5862 if (member != CXXInvalid) {
5863 Diag(Loc, diag::err_illegal_union_member) << Name << member;
5864 DiagnoseNontrivial(RT, member);
5865 NewFD->setInvalidDecl();
5866 }
Douglas Gregor1f2023a2009-07-22 18:25:24 +00005867 }
5868 }
5869 }
5870 }
5871
Douglas Gregor3cf538d2009-03-11 18:59:21 +00005872 // FIXME: We need to pass in the attributes given an AST
5873 // representation, not a parser representation.
5874 if (D)
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00005875 // FIXME: What to pass instead of TUScope?
5876 ProcessDeclAttributes(TUScope, NewFD, *D);
Douglas Gregor3cf538d2009-03-11 18:59:21 +00005877
Fariborz Jahanianf6123ca2009-02-19 00:22:47 +00005878 if (T.isObjCGCWeak())
Fariborz Jahanianed7e9ef2009-02-18 18:14:41 +00005879 Diag(Loc, diag::warn_attribute_weak_on_field);
Anders Carlssonad148062008-02-16 00:29:18 +00005880
Douglas Gregor4dd55f52009-03-11 20:50:30 +00005881 NewFD->setAccess(AS);
5882
5883 // C++ [dcl.init.aggr]p1:
5884 // An aggregate is an array or a class (clause 9) with [...] no
5885 // private or protected non-static data members (clause 11).
5886 // A POD must be an aggregate.
5887 if (getLangOptions().CPlusPlus &&
5888 (AS == AS_private || AS == AS_protected)) {
5889 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record);
5890 CXXRecord->setAggregate(false);
5891 CXXRecord->setPOD(false);
5892 }
5893
Steve Naroff5912a352007-08-28 20:14:24 +00005894 return NewFD;
Reid Spencer5f016e22007-07-11 17:01:13 +00005895}
5896
Douglas Gregor1f2023a2009-07-22 18:25:24 +00005897/// DiagnoseNontrivial - Given that a class has a non-trivial
5898/// special member, figure out why.
5899void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) {
5900 QualType QT(T, 0U);
5901 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl());
5902
5903 // Check whether the member was user-declared.
5904 switch (member) {
Douglas Gregor66dd9392010-04-22 14:36:26 +00005905 case CXXInvalid:
5906 break;
5907
Anders Carlsson3b8c53b2010-04-22 05:40:53 +00005908 case CXXConstructor:
Douglas Gregor1f2023a2009-07-22 18:25:24 +00005909 if (RD->hasUserDeclaredConstructor()) {
5910 typedef CXXRecordDecl::ctor_iterator ctor_iter;
Sebastian Redl38fd4d02009-10-25 22:31:45 +00005911 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){
5912 const FunctionDecl *body = 0;
5913 ci->getBody(body);
Anders Carlsson10dc0f82010-04-20 23:32:58 +00005914 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) {
Douglas Gregor1f2023a2009-07-22 18:25:24 +00005915 SourceLocation CtorLoc = ci->getLocation();
5916 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member;
5917 return;
5918 }
Sebastian Redl38fd4d02009-10-25 22:31:45 +00005919 }
Douglas Gregor1f2023a2009-07-22 18:25:24 +00005920
5921 assert(0 && "found no user-declared constructors");
5922 return;
5923 }
5924 break;
5925
5926 case CXXCopyConstructor:
5927 if (RD->hasUserDeclaredCopyConstructor()) {
5928 SourceLocation CtorLoc =
5929 RD->getCopyConstructor(Context, 0)->getLocation();
5930 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member;
5931 return;
5932 }
5933 break;
5934
5935 case CXXCopyAssignment:
5936 if (RD->hasUserDeclaredCopyAssignment()) {
5937 // FIXME: this should use the location of the copy
5938 // assignment, not the type.
5939 SourceLocation TyLoc = RD->getSourceRange().getBegin();
5940 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member;
5941 return;
5942 }
5943 break;
5944
5945 case CXXDestructor:
5946 if (RD->hasUserDeclaredDestructor()) {
5947 SourceLocation DtorLoc = RD->getDestructor(Context)->getLocation();
5948 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member;
5949 return;
5950 }
5951 break;
5952 }
5953
5954 typedef CXXRecordDecl::base_class_iterator base_iter;
5955
5956 // Virtual bases and members inhibit trivial copying/construction,
5957 // but not trivial destruction.
5958 if (member != CXXDestructor) {
5959 // Check for virtual bases. vbases includes indirect virtual bases,
5960 // so we just iterate through the direct bases.
5961 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi)
5962 if (bi->isVirtual()) {
5963 SourceLocation BaseLoc = bi->getSourceRange().getBegin();
5964 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1;
5965 return;
5966 }
5967
5968 // Check for virtual methods.
5969 typedef CXXRecordDecl::method_iterator meth_iter;
5970 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me;
5971 ++mi) {
5972 if (mi->isVirtual()) {
5973 SourceLocation MLoc = mi->getSourceRange().getBegin();
5974 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0;
5975 return;
5976 }
5977 }
5978 }
Mike Stump1eb44332009-09-09 15:08:12 +00005979
Douglas Gregor1f2023a2009-07-22 18:25:24 +00005980 bool (CXXRecordDecl::*hasTrivial)() const;
5981 switch (member) {
Anders Carlsson3b8c53b2010-04-22 05:40:53 +00005982 case CXXConstructor:
Douglas Gregor1f2023a2009-07-22 18:25:24 +00005983 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break;
5984 case CXXCopyConstructor:
5985 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break;
5986 case CXXCopyAssignment:
5987 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break;
5988 case CXXDestructor:
5989 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break;
5990 default:
5991 assert(0 && "unexpected special member"); return;
5992 }
5993
5994 // Check for nontrivial bases (and recurse).
5995 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) {
Ted Kremenek6217b802009-07-29 21:53:49 +00005996 const RecordType *BaseRT = bi->getType()->getAs<RecordType>();
Sebastian Redl9994a342009-10-25 17:03:50 +00005997 assert(BaseRT && "Don't know how to handle dependent bases");
Douglas Gregor1f2023a2009-07-22 18:25:24 +00005998 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl());
5999 if (!(BaseRecTy->*hasTrivial)()) {
6000 SourceLocation BaseLoc = bi->getSourceRange().getBegin();
6001 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member;
6002 DiagnoseNontrivial(BaseRT, member);
6003 return;
6004 }
6005 }
Mike Stump1eb44332009-09-09 15:08:12 +00006006
Douglas Gregor1f2023a2009-07-22 18:25:24 +00006007 // Check for nontrivial members (and recurse).
6008 typedef RecordDecl::field_iterator field_iter;
6009 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe;
6010 ++fi) {
Douglas Gregor5e03f9e2009-07-23 23:49:00 +00006011 QualType EltTy = Context.getBaseElementType((*fi)->getType());
Ted Kremenek6217b802009-07-29 21:53:49 +00006012 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) {
Douglas Gregor1f2023a2009-07-22 18:25:24 +00006013 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl());
6014
6015 if (!(EltRD->*hasTrivial)()) {
6016 SourceLocation FLoc = (*fi)->getLocation();
6017 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member;
6018 DiagnoseNontrivial(EltRT, member);
6019 return;
6020 }
6021 }
6022 }
6023
6024 assert(0 && "found no explanation for non-trivial member");
6025}
6026
Mike Stump1eb44332009-09-09 15:08:12 +00006027/// TranslateIvarVisibility - Translate visibility from a token ID to an
Fariborz Jahanian89204a12007-10-01 16:53:59 +00006028/// AST enum value.
Ted Kremeneka526c5c2008-01-07 19:49:32 +00006029static ObjCIvarDecl::AccessControl
Fariborz Jahanian89204a12007-10-01 16:53:59 +00006030TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) {
Steve Narofff13271f2007-09-14 23:09:53 +00006031 switch (ivarVisibility) {
Chris Lattner33d34a62008-10-12 00:28:42 +00006032 default: assert(0 && "Unknown visitibility kind");
6033 case tok::objc_private: return ObjCIvarDecl::Private;
6034 case tok::objc_public: return ObjCIvarDecl::Public;
6035 case tok::objc_protected: return ObjCIvarDecl::Protected;
6036 case tok::objc_package: return ObjCIvarDecl::Package;
Steve Narofff13271f2007-09-14 23:09:53 +00006037 }
6038}
6039
Mike Stump1eb44332009-09-09 15:08:12 +00006040/// ActOnIvar - Each ivar field of an objective-c class is passed into this
Fariborz Jahanian45bc03f2008-04-11 16:55:42 +00006041/// in order to create an IvarDecl object for it.
Chris Lattnerb28317a2009-03-28 19:18:32 +00006042Sema::DeclPtrTy Sema::ActOnIvar(Scope *S,
Mike Stump1eb44332009-09-09 15:08:12 +00006043 SourceLocation DeclStart,
Fariborz Jahanian496b5a82009-06-05 18:16:35 +00006044 DeclPtrTy IntfDecl,
Chris Lattnerb28317a2009-03-28 19:18:32 +00006045 Declarator &D, ExprTy *BitfieldWidth,
6046 tok::ObjCKeywordKind Visibility) {
Mike Stump1eb44332009-09-09 15:08:12 +00006047
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00006048 IdentifierInfo *II = D.getIdentifier();
6049 Expr *BitWidth = (Expr*)BitfieldWidth;
6050 SourceLocation Loc = DeclStart;
6051 if (II) Loc = D.getIdentifierLoc();
Mike Stump1eb44332009-09-09 15:08:12 +00006052
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00006053 // FIXME: Unnamed fields can be handled in various different ways, for
6054 // example, unnamed unions inject all members into the struct namespace!
Mike Stump1eb44332009-09-09 15:08:12 +00006055
John McCallbf1a0282010-06-04 23:28:52 +00006056 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
6057 QualType T = TInfo->getType();
Mike Stump1eb44332009-09-09 15:08:12 +00006058
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00006059 if (BitWidth) {
Steve Naroff63359c82009-02-20 17:57:11 +00006060 // 6.7.2.1p3, 6.7.2.1p4
Chris Lattner24793662009-03-05 22:45:59 +00006061 if (VerifyBitField(Loc, II, T, BitWidth)) {
Chris Lattnereaaebc72009-04-25 08:06:05 +00006062 D.setInvalidType();
Chris Lattner24793662009-03-05 22:45:59 +00006063 DeleteExpr(BitWidth);
6064 BitWidth = 0;
6065 }
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00006066 } else {
6067 // Not a bitfield.
Mike Stump1eb44332009-09-09 15:08:12 +00006068
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00006069 // validate II.
Mike Stump1eb44332009-09-09 15:08:12 +00006070
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00006071 }
Fariborz Jahanian0b7bc8e2010-04-26 22:07:03 +00006072 if (T->isReferenceType()) {
6073 Diag(Loc, diag::err_ivar_reference_type);
6074 D.setInvalidType();
6075 }
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00006076 // C99 6.7.2.1p8: A member of a structure or union may have any type other
6077 // than a variably modified type.
Fariborz Jahanian0b7bc8e2010-04-26 22:07:03 +00006078 else if (T->isVariablyModifiedType()) {
Anders Carlsson96e05bc2008-12-07 00:20:55 +00006079 Diag(Loc, diag::err_typecheck_ivar_variable_size);
Chris Lattnereaaebc72009-04-25 08:06:05 +00006080 D.setInvalidType();
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00006081 }
Mike Stump1eb44332009-09-09 15:08:12 +00006082
Ted Kremenekb8db21d2008-07-23 18:04:17 +00006083 // Get the visibility (access control) for this ivar.
Mike Stump1eb44332009-09-09 15:08:12 +00006084 ObjCIvarDecl::AccessControl ac =
Ted Kremenekb8db21d2008-07-23 18:04:17 +00006085 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility)
6086 : ObjCIvarDecl::None;
Fariborz Jahanian496b5a82009-06-05 18:16:35 +00006087 // Must set ivar's DeclContext to its enclosing interface.
Daniel Dunbara19331f2010-04-02 18:29:09 +00006088 ObjCContainerDecl *EnclosingDecl = IntfDecl.getAs<ObjCContainerDecl>();
6089 ObjCContainerDecl *EnclosingContext;
Mike Stump1eb44332009-09-09 15:08:12 +00006090 if (ObjCImplementationDecl *IMPDecl =
Fariborz Jahanian496b5a82009-06-05 18:16:35 +00006091 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) {
6092 // Case of ivar declared in an implementation. Context is that of its class.
Daniel Dunbara19331f2010-04-02 18:29:09 +00006093 EnclosingContext = IMPDecl->getClassInterface();
6094 assert(EnclosingContext && "Implementation has no class interface!");
Fariborz Jahanian0bd04592010-04-06 22:43:48 +00006095 } else {
6096 if (ObjCCategoryDecl *CDecl =
6097 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) {
6098 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) {
6099 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension();
6100 return DeclPtrTy();
6101 }
6102 }
Daniel Dunbara19331f2010-04-02 18:29:09 +00006103 EnclosingContext = EnclosingDecl;
Fariborz Jahanian0bd04592010-04-06 22:43:48 +00006104 }
Mike Stump1eb44332009-09-09 15:08:12 +00006105
Ted Kremenekb8db21d2008-07-23 18:04:17 +00006106 // Construct the decl.
Mike Stump1eb44332009-09-09 15:08:12 +00006107 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context,
Argyrios Kyrtzidisa1d56622009-08-19 01:27:57 +00006108 EnclosingContext, Loc, II, T,
John McCalla93c9342009-12-07 02:54:59 +00006109 TInfo, ac, (Expr *)BitfieldWidth);
Mike Stump1eb44332009-09-09 15:08:12 +00006110
Douglas Gregor72de6672009-01-08 20:45:30 +00006111 if (II) {
Douglas Gregorc83c6872010-04-15 22:33:43 +00006112 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName,
John McCall7d384dd2009-11-18 07:57:50 +00006113 ForRedeclaration);
Fariborz Jahanian496b5a82009-06-05 18:16:35 +00006114 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S)
Douglas Gregor72de6672009-01-08 20:45:30 +00006115 && !isa<TagDecl>(PrevDecl)) {
6116 Diag(Loc, diag::err_duplicate_member) << II;
6117 Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
6118 NewID->setInvalidDecl();
6119 }
6120 }
6121
Ted Kremenekb8db21d2008-07-23 18:04:17 +00006122 // Process attributes attached to the ivar.
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00006123 ProcessDeclAttributes(S, NewID, D);
Mike Stump1eb44332009-09-09 15:08:12 +00006124
Chris Lattnereaaebc72009-04-25 08:06:05 +00006125 if (D.isInvalidType())
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00006126 NewID->setInvalidDecl();
Ted Kremenekb8db21d2008-07-23 18:04:17 +00006127
Douglas Gregor72de6672009-01-08 20:45:30 +00006128 if (II) {
6129 // FIXME: When interfaces are DeclContexts, we'll need to add
6130 // these to the interface.
Chris Lattnerb28317a2009-03-28 19:18:32 +00006131 S->AddDecl(DeclPtrTy::make(NewID));
Douglas Gregor72de6672009-01-08 20:45:30 +00006132 IdResolver.AddDecl(NewID);
6133 }
6134
Chris Lattnerb28317a2009-03-28 19:18:32 +00006135 return DeclPtrTy::make(NewID);
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00006136}
6137
Fariborz Jahanian9d048ff2007-09-29 00:54:24 +00006138void Sema::ActOnFields(Scope* S,
Chris Lattnerb28317a2009-03-28 19:18:32 +00006139 SourceLocation RecLoc, DeclPtrTy RecDecl,
6140 DeclPtrTy *Fields, unsigned NumFields,
Daniel Dunbar1bfe1c22008-10-03 02:03:53 +00006141 SourceLocation LBrac, SourceLocation RBrac,
Daniel Dunbar7d076642008-10-03 17:33:35 +00006142 AttributeList *Attr) {
Chris Lattnerb28317a2009-03-28 19:18:32 +00006143 Decl *EnclosingDecl = RecDecl.getAs<Decl>();
Steve Naroff74216642007-09-14 22:20:54 +00006144 assert(EnclosingDecl && "missing record or interface decl");
Mike Stump1eb44332009-09-09 15:08:12 +00006145
Chris Lattner1829a6d2009-02-23 22:00:08 +00006146 // If the decl this is being inserted into is invalid, then it may be a
6147 // redeclaration or some other bogus case. Don't try to add fields to it.
6148 if (EnclosingDecl->isInvalidDecl()) {
6149 // FIXME: Deallocate fields?
6150 return;
6151 }
6152
Mike Stump1eb44332009-09-09 15:08:12 +00006153
Reid Spencer5f016e22007-07-11 17:01:13 +00006154 // Verify that all the fields are okay.
6155 unsigned NumNamedMembers = 0;
6156 llvm::SmallVector<FieldDecl*, 32> RecFields;
Douglas Gregor6b3945f2009-01-07 19:46:03 +00006157
Chris Lattner1829a6d2009-02-23 22:00:08 +00006158 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl);
Reid Spencer5f016e22007-07-11 17:01:13 +00006159 for (unsigned i = 0; i != NumFields; ++i) {
Chris Lattnerb28317a2009-03-28 19:18:32 +00006160 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>());
Mike Stump1eb44332009-09-09 15:08:12 +00006161
Reid Spencer5f016e22007-07-11 17:01:13 +00006162 // Get the type for the field.
Chris Lattner02c642e2007-07-31 21:33:24 +00006163 Type *FDTy = FD->getType().getTypePtr();
Douglas Gregor6b3945f2009-01-07 19:46:03 +00006164
Douglas Gregor72de6672009-01-08 20:45:30 +00006165 if (!FD->isAnonymousStructOrUnion()) {
Douglas Gregor6b3945f2009-01-07 19:46:03 +00006166 // Remember all fields written by the user.
6167 RecFields.push_back(FD);
6168 }
Mike Stump1eb44332009-09-09 15:08:12 +00006169
Chris Lattner24793662009-03-05 22:45:59 +00006170 // If the field is already invalid for some reason, don't emit more
6171 // diagnostics about it.
Eli Friedman721e77d2009-12-07 00:22:08 +00006172 if (FD->isInvalidDecl()) {
6173 EnclosingDecl->setInvalidDecl();
Chris Lattner24793662009-03-05 22:45:59 +00006174 continue;
Eli Friedman721e77d2009-12-07 00:22:08 +00006175 }
Mike Stump1eb44332009-09-09 15:08:12 +00006176
Douglas Gregore7450f52009-03-24 19:52:54 +00006177 // C99 6.7.2.1p2:
6178 // A structure or union shall not contain a member with
6179 // incomplete or function type (hence, a structure shall not
6180 // contain an instance of itself, but may contain a pointer to
6181 // an instance of itself), except that the last member of a
6182 // structure with more than one named member may have incomplete
6183 // array type; such a structure (and any union containing,
6184 // possibly recursively, a member that is such a structure)
6185 // shall not be a member of a structure or an element of an
6186 // array.
Chris Lattner02c642e2007-07-31 21:33:24 +00006187 if (FDTy->isFunctionType()) {
Douglas Gregore7450f52009-03-24 19:52:54 +00006188 // Field declared as a function.
Chris Lattnerf3a41af2008-11-20 06:38:18 +00006189 Diag(FD->getLocation(), diag::err_field_declared_as_function)
Chris Lattnerd9d22dd2008-11-24 05:29:24 +00006190 << FD->getDeclName();
Steve Naroff74216642007-09-14 22:20:54 +00006191 FD->setInvalidDecl();
6192 EnclosingDecl->setInvalidDecl();
Reid Spencer5f016e22007-07-11 17:01:13 +00006193 continue;
Douglas Gregore7450f52009-03-24 19:52:54 +00006194 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 &&
6195 Record && Record->isStruct()) {
6196 // Flexible array member.
6197 if (NumNamedMembers < 1) {
Chris Lattnerf3a41af2008-11-20 06:38:18 +00006198 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct)
Chris Lattnerd9d22dd2008-11-24 05:29:24 +00006199 << FD->getDeclName();
Steve Naroff74216642007-09-14 22:20:54 +00006200 FD->setInvalidDecl();
6201 EnclosingDecl->setInvalidDecl();
Reid Spencer5f016e22007-07-11 17:01:13 +00006202 continue;
6203 }
Fariborz Jahanian4142ceb2010-05-26 20:19:07 +00006204 if (!FD->getType()->isDependentType() &&
6205 !Context.getBaseElementType(FD->getType())->isPODType()) {
6206 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type)
Fariborz Jahanian2c0a5402010-05-26 20:46:24 +00006207 << FD->getDeclName() << FD->getType();
Fariborz Jahanian4142ceb2010-05-26 20:19:07 +00006208 FD->setInvalidDecl();
6209 EnclosingDecl->setInvalidDecl();
6210 continue;
6211 }
6212
Reid Spencer5f016e22007-07-11 17:01:13 +00006213 // Okay, we have a legal flexible array member at the end of the struct.
Fariborz Jahaniane267ab62007-09-14 16:27:55 +00006214 if (Record)
6215 Record->setHasFlexibleArrayMember(true);
Douglas Gregore7450f52009-03-24 19:52:54 +00006216 } else if (!FDTy->isDependentType() &&
Mike Stump1eb44332009-09-09 15:08:12 +00006217 RequireCompleteType(FD->getLocation(), FD->getType(),
Douglas Gregore7450f52009-03-24 19:52:54 +00006218 diag::err_field_incomplete)) {
6219 // Incomplete type
6220 FD->setInvalidDecl();
6221 EnclosingDecl->setInvalidDecl();
6222 continue;
Ted Kremenek6217b802009-07-29 21:53:49 +00006223 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) {
Reid Spencer5f016e22007-07-11 17:01:13 +00006224 if (FDTTy->getDecl()->hasFlexibleArrayMember()) {
6225 // If this is a member of a union, then entire union becomes "flexible".
Argyrios Kyrtzidis39ba4ae2008-06-09 23:19:58 +00006226 if (Record && Record->isUnion()) {
Reid Spencer5f016e22007-07-11 17:01:13 +00006227 Record->setHasFlexibleArrayMember(true);
6228 } else {
6229 // If this is a struct/class and this is not the last element, reject
6230 // it. Note that GCC supports variable sized arrays in the middle of
6231 // structures.
Douglas Gregore4f3e062009-03-06 23:41:27 +00006232 if (i != NumFields-1)
6233 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct)
Chris Lattner740782a2009-04-25 18:52:45 +00006234 << FD->getDeclName() << FD->getType();
Douglas Gregore4f3e062009-03-06 23:41:27 +00006235 else {
6236 // We support flexible arrays at the end of structs in
6237 // other structs as an extension.
6238 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct)
6239 << FD->getDeclName();
6240 if (Record)
6241 Record->setHasFlexibleArrayMember(true);
Reid Spencer5f016e22007-07-11 17:01:13 +00006242 }
Reid Spencer5f016e22007-07-11 17:01:13 +00006243 }
6244 }
Fariborz Jahanian082b02e2009-07-08 01:18:33 +00006245 if (Record && FDTTy->getDecl()->hasObjectMember())
6246 Record->setHasObjectMember(true);
John McCallc12c5bb2010-05-15 11:32:37 +00006247 } else if (FDTy->isObjCObjectType()) {
Douglas Gregore7450f52009-03-24 19:52:54 +00006248 /// A field cannot be an Objective-c object
Steve Naroffccef3712009-02-20 22:59:16 +00006249 Diag(FD->getLocation(), diag::err_statically_allocated_object);
Fariborz Jahaniane7f64cc2007-10-12 22:10:42 +00006250 FD->setInvalidDecl();
6251 EnclosingDecl->setInvalidDecl();
6252 continue;
Mike Stumpac5fc7c2009-08-04 21:02:39 +00006253 } else if (getLangOptions().ObjC1 &&
6254 getLangOptions().getGCMode() != LangOptions::NonGC &&
6255 Record &&
6256 (FD->getType()->isObjCObjectPointerType() ||
6257 FD->getType().isObjCGCStrong()))
Fariborz Jahanian082b02e2009-07-08 01:18:33 +00006258 Record->setHasObjectMember(true);
Fariborz Jahanian55bcace2010-06-15 22:44:06 +00006259 else if (Context.getAsArrayType(FD->getType())) {
6260 QualType BaseType = Context.getBaseElementType(FD->getType());
6261 if (Record && BaseType->isRecordType() &&
6262 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember())
6263 Record->setHasObjectMember(true);
6264 }
Reid Spencer5f016e22007-07-11 17:01:13 +00006265 // Keep track of the number of named members.
Douglas Gregor72de6672009-01-08 20:45:30 +00006266 if (FD->getIdentifier())
Reid Spencer5f016e22007-07-11 17:01:13 +00006267 ++NumNamedMembers;
Reid Spencer5f016e22007-07-11 17:01:13 +00006268 }
Sebastian Redl64b45f72009-01-05 20:52:13 +00006269
Reid Spencer5f016e22007-07-11 17:01:13 +00006270 // Okay, we successfully defined 'Record'.
Chris Lattnere1e79852008-02-06 00:51:33 +00006271 if (Record) {
Douglas Gregor838db382010-02-11 01:19:42 +00006272 Record->completeDefinition();
Chris Lattnere1e79852008-02-06 00:51:33 +00006273 } else {
Jay Foadbeaaccd2009-05-21 09:52:38 +00006274 ObjCIvarDecl **ClsFields =
6275 reinterpret_cast<ObjCIvarDecl**>(RecFields.data());
Fariborz Jahanian60f8c862008-12-13 20:28:25 +00006276 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) {
Chris Lattner38af2de2009-02-20 21:35:13 +00006277 ID->setLocEnd(RBrac);
Fariborz Jahanian496b5a82009-06-05 18:16:35 +00006278 // Add ivar's to class's DeclContext.
6279 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) {
6280 ClsFields[i]->setLexicalDeclContext(ID);
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00006281 ID->addDecl(ClsFields[i]);
Fariborz Jahanian496b5a82009-06-05 18:16:35 +00006282 }
Fariborz Jahanian3281eff2008-12-16 01:08:35 +00006283 // Must enforce the rule that ivars in the base classes may not be
6284 // duplicates.
Fariborz Jahanianf914b972010-02-23 23:41:11 +00006285 if (ID->getSuperClass())
6286 DiagnoseDuplicateIvars(ID, ID->getSuperClass());
Mike Stump1eb44332009-09-09 15:08:12 +00006287 } else if (ObjCImplementationDecl *IMPDecl =
Chris Lattner1829a6d2009-02-23 22:00:08 +00006288 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) {
Ted Kremeneka526c5c2008-01-07 19:49:32 +00006289 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl");
Fariborz Jahanian496b5a82009-06-05 18:16:35 +00006290 for (unsigned I = 0, N = RecFields.size(); I != N; ++I)
6291 // Ivar declared in @implementation never belongs to the implementation.
6292 // Only it is in implementation's lexical context.
Douglas Gregor8f36aba2009-04-23 03:23:08 +00006293 ClsFields[I]->setLexicalDeclContext(IMPDecl);
Fariborz Jahanian3a3ca1b2007-10-31 18:48:14 +00006294 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac);
Fariborz Jahanian83c481a2010-02-22 23:04:20 +00006295 } else if (ObjCCategoryDecl *CDecl =
6296 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) {
Fariborz Jahanian0bd04592010-04-06 22:43:48 +00006297 // case of ivars in class extension; all other cases have been
6298 // reported as errors elsewhere.
6299 // FIXME. Class extension does not have a LocEnd field.
6300 // CDecl->setLocEnd(RBrac);
6301 // Add ivar's to class extension's DeclContext.
6302 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) {
6303 ClsFields[i]->setLexicalDeclContext(CDecl);
6304 CDecl->addDecl(ClsFields[i]);
Fariborz Jahanian83c481a2010-02-22 23:04:20 +00006305 }
Fariborz Jahaniand0b90bf2007-09-26 18:27:25 +00006306 }
Fariborz Jahanianb04a0212007-09-14 21:08:27 +00006307 }
Daniel Dunbar7d076642008-10-03 17:33:35 +00006308
6309 if (Attr)
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00006310 ProcessDeclAttributeList(S, Record, Attr);
Reid Spencer5f016e22007-07-11 17:01:13 +00006311}
6312
Douglas Gregor677e4fe2010-02-01 23:36:03 +00006313/// \brief Determine whether the given integral value is representable within
6314/// the given type T.
6315static bool isRepresentableIntegerValue(ASTContext &Context,
6316 llvm::APSInt &Value,
6317 QualType T) {
Douglas Gregor9d3347a2010-06-16 00:35:25 +00006318 assert(T->isIntegralType(Context) && "Integral type required!");
Douglas Gregoraf68d4e2010-04-15 15:53:31 +00006319 unsigned BitWidth = Context.getIntWidth(T);
Douglas Gregor677e4fe2010-02-01 23:36:03 +00006320
6321 if (Value.isUnsigned() || Value.isNonNegative())
6322 return Value.getActiveBits() < BitWidth;
6323
6324 return Value.getMinSignedBits() <= BitWidth;
6325}
6326
6327// \brief Given an integral type, return the next larger integral type
6328// (or a NULL type of no such type exists).
6329static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) {
6330 // FIXME: Int128/UInt128 support, which also needs to be introduced into
6331 // enum checking below.
Douglas Gregor9d3347a2010-06-16 00:35:25 +00006332 assert(T->isIntegralType(Context) && "Integral type required!");
Douglas Gregor677e4fe2010-02-01 23:36:03 +00006333 const unsigned NumTypes = 4;
6334 QualType SignedIntegralTypes[NumTypes] = {
6335 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy
6336 };
6337 QualType UnsignedIntegralTypes[NumTypes] = {
6338 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy,
6339 Context.UnsignedLongLongTy
6340 };
6341
6342 unsigned BitWidth = Context.getTypeSize(T);
6343 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes
6344 : UnsignedIntegralTypes;
6345 for (unsigned I = 0; I != NumTypes; ++I)
6346 if (Context.getTypeSize(Types[I]) > BitWidth)
6347 return Types[I];
6348
6349 return QualType();
6350}
6351
Douglas Gregor879fd492009-03-17 19:05:46 +00006352EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum,
6353 EnumConstantDecl *LastEnumConst,
6354 SourceLocation IdLoc,
6355 IdentifierInfo *Id,
6356 ExprArg val) {
6357 Expr *Val = (Expr *)val.get();
6358
Douglas Gregor677e4fe2010-02-01 23:36:03 +00006359 unsigned IntWidth = Context.Target.getIntWidth();
6360 llvm::APSInt EnumVal(IntWidth);
Douglas Gregor879fd492009-03-17 19:05:46 +00006361 QualType EltTy;
Douglas Gregor4912c342009-11-06 00:03:12 +00006362 if (Val) {
Douglas Gregor9b9edd62010-03-02 17:53:14 +00006363 if (Enum->isDependentType() || Val->isTypeDependent())
Douglas Gregor4912c342009-11-06 00:03:12 +00006364 EltTy = Context.DependentTy;
6365 else {
Douglas Gregor4912c342009-11-06 00:03:12 +00006366 // C99 6.7.2.2p2: Make sure we have an integer constant expression.
6367 SourceLocation ExpLoc;
Douglas Gregor9b9edd62010-03-02 17:53:14 +00006368 if (!Val->isValueDependent() &&
6369 VerifyIntegerConstantExpression(Val, &EnumVal)) {
Douglas Gregor4912c342009-11-06 00:03:12 +00006370 Val = 0;
Douglas Gregor677e4fe2010-02-01 23:36:03 +00006371 } else {
6372 if (!getLangOptions().CPlusPlus) {
6373 // C99 6.7.2.2p2:
6374 // The expression that defines the value of an enumeration constant
6375 // shall be an integer constant expression that has a value
6376 // representable as an int.
6377
6378 // Complain if the value is not representable in an int.
6379 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy))
6380 Diag(IdLoc, diag::ext_enum_value_not_int)
6381 << EnumVal.toString(10) << Val->getSourceRange()
Douglas Gregor19c15252010-02-17 22:40:11 +00006382 << (EnumVal.isUnsigned() || EnumVal.isNonNegative());
Douglas Gregor677e4fe2010-02-01 23:36:03 +00006383 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) {
6384 // Force the type of the expression to 'int'.
6385 ImpCastExprToType(Val, Context.IntTy, CastExpr::CK_IntegralCast);
6386
6387 if (Val != val.get()) {
6388 val.release();
6389 val = Val;
6390 }
6391 }
6392 }
6393
6394 // C++0x [dcl.enum]p5:
6395 // If the underlying type is not fixed, the type of each enumerator
6396 // is the type of its initializing value:
6397 // - If an initializer is specified for an enumerator, the
6398 // initializing value has the same type as the expression.
Douglas Gregor4912c342009-11-06 00:03:12 +00006399 EltTy = Val->getType();
6400 }
Douglas Gregor879fd492009-03-17 19:05:46 +00006401 }
6402 }
Mike Stump1eb44332009-09-09 15:08:12 +00006403
Douglas Gregor879fd492009-03-17 19:05:46 +00006404 if (!Val) {
Eli Friedmaned0716b2009-12-11 01:34:50 +00006405 if (Enum->isDependentType())
6406 EltTy = Context.DependentTy;
Douglas Gregor677e4fe2010-02-01 23:36:03 +00006407 else if (!LastEnumConst) {
6408 // C++0x [dcl.enum]p5:
6409 // If the underlying type is not fixed, the type of each enumerator
6410 // is the type of its initializing value:
6411 // - If no initializer is specified for the first enumerator, the
6412 // initializing value has an unspecified integral type.
6413 //
6414 // GCC uses 'int' for its unspecified integral type, as does
6415 // C99 6.7.2.2p3.
6416 EltTy = Context.IntTy;
6417 } else {
Douglas Gregor879fd492009-03-17 19:05:46 +00006418 // Assign the last value + 1.
6419 EnumVal = LastEnumConst->getInitVal();
6420 ++EnumVal;
Douglas Gregor677e4fe2010-02-01 23:36:03 +00006421 EltTy = LastEnumConst->getType();
Douglas Gregor879fd492009-03-17 19:05:46 +00006422
6423 // Check for overflow on increment.
Douglas Gregor677e4fe2010-02-01 23:36:03 +00006424 if (EnumVal < LastEnumConst->getInitVal()) {
6425 // C++0x [dcl.enum]p5:
6426 // If the underlying type is not fixed, the type of each enumerator
6427 // is the type of its initializing value:
6428 //
6429 // - Otherwise the type of the initializing value is the same as
6430 // the type of the initializing value of the preceding enumerator
6431 // unless the incremented value is not representable in that type,
6432 // in which case the type is an unspecified integral type
6433 // sufficient to contain the incremented value. If no such type
6434 // exists, the program is ill-formed.
6435 QualType T = getNextLargerIntegralType(Context, EltTy);
6436 if (T.isNull()) {
6437 // There is no integral type larger enough to represent this
6438 // value. Complain, then allow the value to wrap around.
6439 EnumVal = LastEnumConst->getInitVal();
6440 EnumVal.zext(EnumVal.getBitWidth() * 2);
6441 Diag(IdLoc, diag::warn_enumerator_too_large)
6442 << EnumVal.toString(10);
6443 } else {
6444 EltTy = T;
6445 }
6446
6447 // Retrieve the last enumerator's value, extent that type to the
6448 // type that is supposed to be large enough to represent the incremented
6449 // value, then increment.
6450 EnumVal = LastEnumConst->getInitVal();
6451 EnumVal.setIsSigned(EltTy->isSignedIntegerType());
Douglas Gregoraf68d4e2010-04-15 15:53:31 +00006452 EnumVal.zextOrTrunc(Context.getIntWidth(EltTy));
Douglas Gregor677e4fe2010-02-01 23:36:03 +00006453 ++EnumVal;
6454
6455 // If we're not in C++, diagnose the overflow of enumerator values,
6456 // which in C99 means that the enumerator value is not representable in
6457 // an int (C99 6.7.2.2p2). However, we support GCC's extension that
6458 // permits enumerator values that are representable in some larger
6459 // integral type.
6460 if (!getLangOptions().CPlusPlus && !T.isNull())
6461 Diag(IdLoc, diag::warn_enum_value_overflow);
6462 } else if (!getLangOptions().CPlusPlus &&
6463 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) {
6464 // Enforce C99 6.7.2.2p2 even when we compute the next value.
6465 Diag(IdLoc, diag::ext_enum_value_not_int)
6466 << EnumVal.toString(10) << 1;
6467 }
Douglas Gregor879fd492009-03-17 19:05:46 +00006468 }
6469 }
Mike Stump1eb44332009-09-09 15:08:12 +00006470
Douglas Gregor9b9edd62010-03-02 17:53:14 +00006471 if (!EltTy->isDependentType()) {
Douglas Gregor677e4fe2010-02-01 23:36:03 +00006472 // Make the enumerator value match the signedness and size of the
6473 // enumerator's type.
Douglas Gregoraf68d4e2010-04-15 15:53:31 +00006474 EnumVal.zextOrTrunc(Context.getIntWidth(EltTy));
Douglas Gregor677e4fe2010-02-01 23:36:03 +00006475 EnumVal.setIsSigned(EltTy->isSignedIntegerType());
6476 }
Douglas Gregor4912c342009-11-06 00:03:12 +00006477
Douglas Gregor879fd492009-03-17 19:05:46 +00006478 val.release();
6479 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy,
Mike Stump1eb44332009-09-09 15:08:12 +00006480 Val, EnumVal);
Douglas Gregor879fd492009-03-17 19:05:46 +00006481}
6482
6483
Chris Lattnerb28317a2009-03-28 19:18:32 +00006484Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl,
6485 DeclPtrTy lastEnumConst,
6486 SourceLocation IdLoc,
6487 IdentifierInfo *Id,
6488 SourceLocation EqualLoc, ExprTy *val) {
6489 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>());
Reid Spencer5f016e22007-07-11 17:01:13 +00006490 EnumConstantDecl *LastEnumConst =
Chris Lattnerb28317a2009-03-28 19:18:32 +00006491 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>());
Reid Spencer5f016e22007-07-11 17:01:13 +00006492 Expr *Val = static_cast<Expr*>(val);
6493
Chris Lattner31e05722007-08-26 06:24:45 +00006494 // The scope passed in may not be a decl scope. Zip up the scope tree until
6495 // we find one that is.
Douglas Gregor1a0d31a2009-01-12 18:45:55 +00006496 S = getNonFieldDeclScope(S);
Mike Stump1eb44332009-09-09 15:08:12 +00006497
Reid Spencer5f016e22007-07-11 17:01:13 +00006498 // Verify that there isn't already something declared with this name in this
6499 // scope.
Douglas Gregorc83c6872010-04-15 22:33:43 +00006500 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName,
Douglas Gregore39fe722010-01-19 06:06:57 +00006501 ForRedeclaration);
Douglas Gregorf57172b2008-12-08 18:40:42 +00006502 if (PrevDecl && PrevDecl->isTemplateParameter()) {
Douglas Gregor72c3f312008-12-05 18:15:24 +00006503 // Maybe we will complain about the shadowed template parameter.
6504 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl);
6505 // Just pretend that we didn't see the previous declaration.
6506 PrevDecl = 0;
6507 }
6508
6509 if (PrevDecl) {
Argyrios Kyrtzidis0ff12f02008-07-16 21:01:53 +00006510 // When in C++, we may get a TagDecl with the same name; in this case the
6511 // enum constant will 'hide' the tag.
6512 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) &&
6513 "Received TagDecl when not in C++!");
Argyrios Kyrtzidis15a12d02008-09-09 21:18:04 +00006514 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) {
Reid Spencer5f016e22007-07-11 17:01:13 +00006515 if (isa<EnumConstantDecl>(PrevDecl))
Chris Lattner3c73c412008-11-19 08:23:25 +00006516 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id;
Reid Spencer5f016e22007-07-11 17:01:13 +00006517 else
Chris Lattner3c73c412008-11-19 08:23:25 +00006518 Diag(IdLoc, diag::err_redefinition) << Id;
Chris Lattner5f4a6822008-11-23 23:12:31 +00006519 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
Chris Lattnerf306f862009-02-28 19:37:57 +00006520 if (Val) Val->Destroy(Context);
Chris Lattnerb28317a2009-03-28 19:18:32 +00006521 return DeclPtrTy();
Reid Spencer5f016e22007-07-11 17:01:13 +00006522 }
6523 }
6524
Douglas Gregor879fd492009-03-17 19:05:46 +00006525 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst,
6526 IdLoc, Id, Owned(Val));
Chris Lattner421a23d2007-08-27 21:16:18 +00006527
Reid Spencer5f016e22007-07-11 17:01:13 +00006528 // Register this decl in the current scope stack.
John McCall92f88312010-01-23 00:46:32 +00006529 if (New) {
6530 New->setAccess(TheEnumDecl->getAccess());
Douglas Gregor879fd492009-03-17 19:05:46 +00006531 PushOnScopeChains(New, S);
John McCall92f88312010-01-23 00:46:32 +00006532 }
Douglas Gregor45579f52008-12-17 02:04:30 +00006533
Chris Lattnerb28317a2009-03-28 19:18:32 +00006534 return DeclPtrTy::make(New);
Reid Spencer5f016e22007-07-11 17:01:13 +00006535}
6536
Mike Stumpc6e35aa2009-05-16 07:06:02 +00006537void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc,
6538 SourceLocation RBraceLoc, DeclPtrTy EnumDeclX,
Edward O'Callaghanfee13812009-08-08 14:36:57 +00006539 DeclPtrTy *Elements, unsigned NumElements,
6540 Scope *S, AttributeList *Attr) {
Chris Lattnerb28317a2009-03-28 19:18:32 +00006541 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>());
Douglas Gregor074149e2009-01-05 19:45:36 +00006542 QualType EnumType = Context.getTypeDeclType(Enum);
Edward O'Callaghanfee13812009-08-08 14:36:57 +00006543
6544 if (Attr)
6545 ProcessDeclAttributeList(S, Enum, Attr);
Mike Stump1eb44332009-09-09 15:08:12 +00006546
Eli Friedmaned0716b2009-12-11 01:34:50 +00006547 if (Enum->isDependentType()) {
6548 for (unsigned i = 0; i != NumElements; ++i) {
6549 EnumConstantDecl *ECD =
6550 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>());
6551 if (!ECD) continue;
6552
6553 ECD->setType(EnumType);
6554 }
6555
John McCall1b5a6182010-05-06 08:49:23 +00006556 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0);
Eli Friedmaned0716b2009-12-11 01:34:50 +00006557 return;
6558 }
6559
Chris Lattnere37f0be2007-08-28 05:10:31 +00006560 // TODO: If the result value doesn't fit in an int, it must be a long or long
6561 // long value. ISO C does not support this, but GCC does as an extension,
6562 // emit a warning.
Chris Lattner98be4942008-03-05 18:54:05 +00006563 unsigned IntWidth = Context.Target.getIntWidth();
Edward O'Callaghanfee13812009-08-08 14:36:57 +00006564 unsigned CharWidth = Context.Target.getCharWidth();
6565 unsigned ShortWidth = Context.Target.getShortWidth();
Mike Stump1eb44332009-09-09 15:08:12 +00006566
Chris Lattnerac609682007-08-28 06:15:15 +00006567 // Verify that all the values are okay, compute the size of the values, and
6568 // reverse the list.
6569 unsigned NumNegativeBits = 0;
6570 unsigned NumPositiveBits = 0;
Mike Stump1eb44332009-09-09 15:08:12 +00006571
Chris Lattnerac609682007-08-28 06:15:15 +00006572 // Keep track of whether all elements have type int.
6573 bool AllElementsInt = true;
Mike Stump1eb44332009-09-09 15:08:12 +00006574
Reid Spencer5f016e22007-07-11 17:01:13 +00006575 for (unsigned i = 0; i != NumElements; ++i) {
6576 EnumConstantDecl *ECD =
Chris Lattnerb28317a2009-03-28 19:18:32 +00006577 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>());
Reid Spencer5f016e22007-07-11 17:01:13 +00006578 if (!ECD) continue; // Already issued a diagnostic.
Mike Stump1eb44332009-09-09 15:08:12 +00006579
Chris Lattner211a30e2007-08-28 05:27:00 +00006580 const llvm::APSInt &InitVal = ECD->getInitVal();
Mike Stump1eb44332009-09-09 15:08:12 +00006581
Chris Lattnerac609682007-08-28 06:15:15 +00006582 // Keep track of the size of positive and negative values.
Chris Lattnera73349d2008-02-26 00:33:57 +00006583 if (InitVal.isUnsigned() || InitVal.isNonNegative())
Chris Lattner21dd8212008-01-14 21:47:29 +00006584 NumPositiveBits = std::max(NumPositiveBits,
6585 (unsigned)InitVal.getActiveBits());
Chris Lattnerac609682007-08-28 06:15:15 +00006586 else
Chris Lattner21dd8212008-01-14 21:47:29 +00006587 NumNegativeBits = std::max(NumNegativeBits,
6588 (unsigned)InitVal.getMinSignedBits());
Reid Spencer5f016e22007-07-11 17:01:13 +00006589
Chris Lattnerac609682007-08-28 06:15:15 +00006590 // Keep track of whether every enum element has type int (very commmon).
6591 if (AllElementsInt)
Mike Stump1eb44332009-09-09 15:08:12 +00006592 AllElementsInt = ECD->getType() == Context.IntTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00006593 }
Mike Stump1eb44332009-09-09 15:08:12 +00006594
Chris Lattnerac609682007-08-28 06:15:15 +00006595 // Figure out the type that should be used for this enum.
Edward O'Callaghanfee13812009-08-08 14:36:57 +00006596 // FIXME: Support -fshort-enums.
Chris Lattnerac609682007-08-28 06:15:15 +00006597 QualType BestType;
Chris Lattnerb7f6e082007-08-29 17:31:48 +00006598 unsigned BestWidth;
Edward O'Callaghanfee13812009-08-08 14:36:57 +00006599
John McCall842aef82009-12-09 09:09:27 +00006600 // C++0x N3000 [conv.prom]p3:
6601 // An rvalue of an unscoped enumeration type whose underlying
6602 // type is not fixed can be converted to an rvalue of the first
6603 // of the following types that can represent all the values of
6604 // the enumeration: int, unsigned int, long int, unsigned long
6605 // int, long long int, or unsigned long long int.
6606 // C99 6.4.4.3p2:
6607 // An identifier declared as an enumeration constant has type int.
6608 // The C99 rule is modified by a gcc extension
6609 QualType BestPromotionType;
6610
Edward O'Callaghanfee13812009-08-08 14:36:57 +00006611 bool Packed = Enum->getAttr<PackedAttr>() ? true : false;
6612
Chris Lattnerac609682007-08-28 06:15:15 +00006613 if (NumNegativeBits) {
Mike Stump1eb44332009-09-09 15:08:12 +00006614 // If there is a negative value, figure out the smallest integer type (of
Chris Lattnerac609682007-08-28 06:15:15 +00006615 // int/long/longlong) that fits.
Edward O'Callaghanfee13812009-08-08 14:36:57 +00006616 // If it's packed, check also if it fits a char or a short.
6617 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) {
John McCall842aef82009-12-09 09:09:27 +00006618 BestType = Context.SignedCharTy;
6619 BestWidth = CharWidth;
Mike Stump1eb44332009-09-09 15:08:12 +00006620 } else if (Packed && NumNegativeBits <= ShortWidth &&
Edward O'Callaghanfee13812009-08-08 14:36:57 +00006621 NumPositiveBits < ShortWidth) {
John McCall842aef82009-12-09 09:09:27 +00006622 BestType = Context.ShortTy;
6623 BestWidth = ShortWidth;
6624 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) {
Chris Lattnerac609682007-08-28 06:15:15 +00006625 BestType = Context.IntTy;
Chris Lattnerb7f6e082007-08-29 17:31:48 +00006626 BestWidth = IntWidth;
6627 } else {
Chris Lattner98be4942008-03-05 18:54:05 +00006628 BestWidth = Context.Target.getLongWidth();
Mike Stump1eb44332009-09-09 15:08:12 +00006629
John McCall842aef82009-12-09 09:09:27 +00006630 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) {
Chris Lattnerac609682007-08-28 06:15:15 +00006631 BestType = Context.LongTy;
John McCall842aef82009-12-09 09:09:27 +00006632 } else {
Chris Lattner98be4942008-03-05 18:54:05 +00006633 BestWidth = Context.Target.getLongLongWidth();
Mike Stump1eb44332009-09-09 15:08:12 +00006634
Chris Lattnerb7f6e082007-08-29 17:31:48 +00006635 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth)
Chris Lattnerac609682007-08-28 06:15:15 +00006636 Diag(Enum->getLocation(), diag::warn_enum_too_large);
6637 BestType = Context.LongLongTy;
6638 }
6639 }
John McCall842aef82009-12-09 09:09:27 +00006640 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType);
Chris Lattnerac609682007-08-28 06:15:15 +00006641 } else {
Douglas Gregoraa74a1e2010-02-02 20:10:50 +00006642 // If there is no negative value, figure out the smallest type that fits
6643 // all of the enumerator values.
Edward O'Callaghanfee13812009-08-08 14:36:57 +00006644 // If it's packed, check also if it fits a char or a short.
6645 if (Packed && NumPositiveBits <= CharWidth) {
John McCall842aef82009-12-09 09:09:27 +00006646 BestType = Context.UnsignedCharTy;
6647 BestPromotionType = Context.IntTy;
6648 BestWidth = CharWidth;
Edward O'Callaghanfee13812009-08-08 14:36:57 +00006649 } else if (Packed && NumPositiveBits <= ShortWidth) {
John McCall842aef82009-12-09 09:09:27 +00006650 BestType = Context.UnsignedShortTy;
6651 BestPromotionType = Context.IntTy;
6652 BestWidth = ShortWidth;
6653 } else if (NumPositiveBits <= IntWidth) {
Chris Lattnerac609682007-08-28 06:15:15 +00006654 BestType = Context.UnsignedIntTy;
Chris Lattnerb7f6e082007-08-29 17:31:48 +00006655 BestWidth = IntWidth;
Douglas Gregoraa74a1e2010-02-02 20:10:50 +00006656 BestPromotionType
6657 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus)
6658 ? Context.UnsignedIntTy : Context.IntTy;
Chris Lattnerb7f6e082007-08-29 17:31:48 +00006659 } else if (NumPositiveBits <=
Chris Lattner98be4942008-03-05 18:54:05 +00006660 (BestWidth = Context.Target.getLongWidth())) {
Chris Lattnerac609682007-08-28 06:15:15 +00006661 BestType = Context.UnsignedLongTy;
Douglas Gregoraa74a1e2010-02-02 20:10:50 +00006662 BestPromotionType
6663 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus)
6664 ? Context.UnsignedLongTy : Context.LongTy;
Chris Lattner98be4942008-03-05 18:54:05 +00006665 } else {
6666 BestWidth = Context.Target.getLongLongWidth();
Chris Lattnerb7f6e082007-08-29 17:31:48 +00006667 assert(NumPositiveBits <= BestWidth &&
Chris Lattnerac609682007-08-28 06:15:15 +00006668 "How could an initializer get larger than ULL?");
6669 BestType = Context.UnsignedLongLongTy;
Douglas Gregoraa74a1e2010-02-02 20:10:50 +00006670 BestPromotionType
6671 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus)
6672 ? Context.UnsignedLongLongTy : Context.LongLongTy;
Chris Lattnerac609682007-08-28 06:15:15 +00006673 }
6674 }
Mike Stump1eb44332009-09-09 15:08:12 +00006675
Chris Lattnerb7f6e082007-08-29 17:31:48 +00006676 // Loop over all of the enumerator constants, changing their types to match
6677 // the type of the enum if needed.
6678 for (unsigned i = 0; i != NumElements; ++i) {
6679 EnumConstantDecl *ECD =
Chris Lattnerb28317a2009-03-28 19:18:32 +00006680 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>());
Chris Lattnerb7f6e082007-08-29 17:31:48 +00006681 if (!ECD) continue; // Already issued a diagnostic.
6682
6683 // Standard C says the enumerators have int type, but we allow, as an
6684 // extension, the enumerators to be larger than int size. If each
6685 // enumerator value fits in an int, type it as an int, otherwise type it the
6686 // same as the enumerator decl itself. This means that in "enum { X = 1U }"
6687 // that X has type 'int', not 'unsigned'.
Chris Lattnerb7f6e082007-08-29 17:31:48 +00006688
6689 // Determine whether the value fits into an int.
6690 llvm::APSInt InitVal = ECD->getInitVal();
Chris Lattnerb7f6e082007-08-29 17:31:48 +00006691
6692 // If it fits into an integer type, force it. Otherwise force it to match
6693 // the enum decl type.
6694 QualType NewTy;
6695 unsigned NewWidth;
6696 bool NewSign;
Douglas Gregor677e4fe2010-02-01 23:36:03 +00006697 if (!getLangOptions().CPlusPlus &&
6698 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) {
Chris Lattnerb7f6e082007-08-29 17:31:48 +00006699 NewTy = Context.IntTy;
6700 NewWidth = IntWidth;
6701 NewSign = true;
6702 } else if (ECD->getType() == BestType) {
6703 // Already the right type!
Douglas Gregorc9467cf2008-12-12 02:00:36 +00006704 if (getLangOptions().CPlusPlus)
6705 // C++ [dcl.enum]p4: Following the closing brace of an
6706 // enum-specifier, each enumerator has the type of its
Mike Stump1eb44332009-09-09 15:08:12 +00006707 // enumeration.
Douglas Gregorc9467cf2008-12-12 02:00:36 +00006708 ECD->setType(EnumType);
Chris Lattnerb7f6e082007-08-29 17:31:48 +00006709 continue;
6710 } else {
6711 NewTy = BestType;
6712 NewWidth = BestWidth;
6713 NewSign = BestType->isSignedIntegerType();
6714 }
6715
6716 // Adjust the APSInt value.
6717 InitVal.extOrTrunc(NewWidth);
6718 InitVal.setIsSigned(NewSign);
6719 ECD->setInitVal(InitVal);
Mike Stump1eb44332009-09-09 15:08:12 +00006720
Chris Lattnerb7f6e082007-08-29 17:31:48 +00006721 // Adjust the Expr initializer and type.
Chris Lattner13fd4162009-01-15 19:19:42 +00006722 if (ECD->getInitExpr())
Mike Stump1eb44332009-09-09 15:08:12 +00006723 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy,
Eli Friedman73c39ab2009-10-20 08:27:19 +00006724 CastExpr::CK_IntegralCast,
Mike Stump1eb44332009-09-09 15:08:12 +00006725 ECD->getInitExpr(),
Anders Carlssonf1b48b72010-04-24 16:57:13 +00006726 CXXBaseSpecifierArray(),
Ted Kremenek8189cde2009-02-07 01:47:29 +00006727 /*isLvalue=*/false));
Douglas Gregorc9467cf2008-12-12 02:00:36 +00006728 if (getLangOptions().CPlusPlus)
6729 // C++ [dcl.enum]p4: Following the closing brace of an
6730 // enum-specifier, each enumerator has the type of its
Mike Stump1eb44332009-09-09 15:08:12 +00006731 // enumeration.
Douglas Gregorc9467cf2008-12-12 02:00:36 +00006732 ECD->setType(EnumType);
6733 else
6734 ECD->setType(NewTy);
Chris Lattnerb7f6e082007-08-29 17:31:48 +00006735 }
Mike Stump1eb44332009-09-09 15:08:12 +00006736
John McCall1b5a6182010-05-06 08:49:23 +00006737 Enum->completeDefinition(BestType, BestPromotionType,
6738 NumPositiveBits, NumNegativeBits);
Reid Spencer5f016e22007-07-11 17:01:13 +00006739}
6740
Chris Lattnerb28317a2009-03-28 19:18:32 +00006741Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc,
6742 ExprArg expr) {
Anders Carlssonf1b1d592009-05-01 19:30:39 +00006743 StringLiteral *AsmString = cast<StringLiteral>(expr.takeAs<Expr>());
Sebastian Redl798d1192008-12-13 16:23:55 +00006744
Douglas Gregor4fe0c8e2009-05-30 00:08:05 +00006745 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext,
6746 Loc, AsmString);
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00006747 CurContext->addDecl(New);
Douglas Gregor4fe0c8e2009-05-30 00:08:05 +00006748 return DeclPtrTy::make(New);
Anders Carlssondfab6cb2008-02-08 00:33:21 +00006749}
Eli Friedmanc49f19b2009-06-05 02:44:36 +00006750
6751void Sema::ActOnPragmaWeakID(IdentifierInfo* Name,
6752 SourceLocation PragmaLoc,
6753 SourceLocation NameLoc) {
Douglas Gregorc83c6872010-04-15 22:33:43 +00006754 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName);
Eli Friedmanc49f19b2009-06-05 02:44:36 +00006755
Eli Friedmanc49f19b2009-06-05 02:44:36 +00006756 if (PrevDecl) {
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00006757 PrevDecl->addAttr(::new (Context) WeakAttr());
Ryan Flynne25ff832009-07-30 03:15:39 +00006758 } else {
6759 (void)WeakUndeclaredIdentifiers.insert(
6760 std::pair<IdentifierInfo*,WeakInfo>
6761 (Name, WeakInfo((IdentifierInfo*)0, NameLoc)));
Eli Friedmanc49f19b2009-06-05 02:44:36 +00006762 }
Eli Friedmanc49f19b2009-06-05 02:44:36 +00006763}
6764
6765void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name,
6766 IdentifierInfo* AliasName,
6767 SourceLocation PragmaLoc,
6768 SourceLocation NameLoc,
6769 SourceLocation AliasNameLoc) {
Douglas Gregorc83c6872010-04-15 22:33:43 +00006770 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc,
6771 LookupOrdinaryName);
Ryan Flynne25ff832009-07-30 03:15:39 +00006772 WeakInfo W = WeakInfo(Name, NameLoc);
Eli Friedmanc49f19b2009-06-05 02:44:36 +00006773
Eli Friedmanc49f19b2009-06-05 02:44:36 +00006774 if (PrevDecl) {
Ryan Flynne25ff832009-07-30 03:15:39 +00006775 if (!PrevDecl->hasAttr<AliasAttr>())
6776 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl))
Ryan Flynn7b1fdbd2009-07-31 02:52:19 +00006777 DeclApplyPragmaWeak(TUScope, ND, W);
Ryan Flynne25ff832009-07-30 03:15:39 +00006778 } else {
6779 (void)WeakUndeclaredIdentifiers.insert(
6780 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W));
Eli Friedmanc49f19b2009-06-05 02:44:36 +00006781 }
Eli Friedmanc49f19b2009-06-05 02:44:36 +00006782}