blob: 9c10b85ad4720d5a8484e6c0c9a72ed011e5a1a3 [file] [log] [blame]
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
John McCall2d887082010-08-25 22:03:47 +000014#include "clang/Sema/SemaInternal.h"
Douglas Gregore737f502010-08-12 20:07:10 +000015#include "clang/Sema/Initialization.h"
16#include "clang/Sema/Lookup.h"
John McCall5f1e0942010-08-24 08:50:51 +000017#include "clang/Sema/CXXFieldCollector.h"
18#include "clang/Sema/Scope.h"
John McCall781472f2010-08-25 08:40:02 +000019#include "clang/Sema/ScopeInfo.h"
Anders Carlssonc44eec62008-07-03 04:20:39 +000020#include "clang/AST/APValue.h"
Chris Lattnere1e79852008-02-06 00:51:33 +000021#include "clang/AST/ASTConsumer.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000022#include "clang/AST/ASTContext.h"
Douglas Gregora8f32e02009-10-06 17:59:45 +000023#include "clang/AST/CXXInheritance.h"
John McCall384aff82010-08-25 07:42:41 +000024#include "clang/AST/DeclCXX.h"
John McCall7cd088e2010-08-24 07:21:54 +000025#include "clang/AST/DeclObjC.h"
Douglas Gregoraaba5e32009-02-04 19:02:06 +000026#include "clang/AST/DeclTemplate.h"
Chris Lattner6b6b5372008-06-26 18:38:35 +000027#include "clang/AST/ExprCXX.h"
Sebastian Redld3a413d2009-04-26 20:35:05 +000028#include "clang/AST/StmtCXX.h"
John McCall19510852010-08-20 18:27:03 +000029#include "clang/Sema/DeclSpec.h"
30#include "clang/Sema/ParsedTemplate.h"
Douglas Gregora786fdb2009-10-13 23:27:22 +000031#include "clang/Parse/ParseDiagnostic.h"
Anders Carlssonb7906612009-08-26 23:45:07 +000032#include "clang/Basic/PartialDiagnostic.h"
Steve Naroff4c49a6c2008-01-30 23:46:05 +000033#include "clang/Basic/SourceManager.h"
Anders Carlssonb7906612009-08-26 23:45:07 +000034#include "clang/Basic/TargetInfo.h"
Steve Naroff4c49a6c2008-01-30 23:46:05 +000035// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's)
Chris Lattnere1e79852008-02-06 00:51:33 +000036#include "clang/Lex/Preprocessor.h"
Mike Stump1eb44332009-09-09 15:08:12 +000037#include "clang/Lex/HeaderSearch.h"
John McCall66755862009-12-24 09:58:38 +000038#include "llvm/ADT/Triple.h"
Douglas Gregor6ed40e32008-12-23 21:05:05 +000039#include <algorithm>
Douglas Gregor9a8c9a22009-09-28 21:14:19 +000040#include <cstring>
Douglas Gregor6ed40e32008-12-23 21:05:05 +000041#include <functional>
Reid Spencer5f016e22007-07-11 17:01:13 +000042using namespace clang;
John McCall781472f2010-08-25 08:40:02 +000043using namespace sema;
Reid Spencer5f016e22007-07-11 17:01:13 +000044
John McCalld226f652010-08-21 09:40:31 +000045Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr) {
46 return DeclGroupPtrTy::make(DeclGroupRef(Ptr));
Chris Lattner682bf922009-03-29 16:50:03 +000047}
48
Douglas Gregord6efafa2009-02-04 19:16:12 +000049/// \brief If the identifier refers to a type name within this scope,
50/// return the declaration of that type.
51///
52/// This routine performs ordinary name lookup of the identifier II
53/// within the given scope, with optional C++ scope specifier SS, to
Douglas Gregor1a51b4a2009-02-09 15:09:02 +000054/// determine whether the name refers to a type. If so, returns an
55/// opaque pointer (actually a QualType) corresponding to that
56/// type. Otherwise, returns NULL.
Douglas Gregord6efafa2009-02-04 19:16:12 +000057///
58/// If name lookup results in an ambiguity, this routine will complain
59/// and then return NULL.
John McCallb3d87482010-08-24 05:47:05 +000060ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc,
61 Scope *S, CXXScopeSpec *SS,
62 bool isClassName,
63 ParsedType ObjectTypePtr) {
Douglas Gregorf6e6fc82009-11-20 22:03:38 +000064 // Determine where we will perform name lookup.
65 DeclContext *LookupCtx = 0;
66 if (ObjectTypePtr) {
John McCallb3d87482010-08-24 05:47:05 +000067 QualType ObjectType = ObjectTypePtr.get();
Douglas Gregorf6e6fc82009-11-20 22:03:38 +000068 if (ObjectType->isRecordType())
69 LookupCtx = computeDeclContext(ObjectType);
Jeffrey Yasskinedc28772010-04-07 23:29:58 +000070 } else if (SS && SS->isNotEmpty()) {
Douglas Gregorf6e6fc82009-11-20 22:03:38 +000071 LookupCtx = computeDeclContext(*SS, false);
72
73 if (!LookupCtx) {
74 if (isDependentScopeSpecifier(*SS)) {
75 // C++ [temp.res]p3:
76 // A qualified-id that refers to a type and in which the
77 // nested-name-specifier depends on a template-parameter (14.6.2)
78 // shall be prefixed by the keyword typename to indicate that the
79 // qualified-id denotes a type, forming an
80 // elaborated-type-specifier (7.1.5.3).
81 //
82 // We therefore do not perform any name lookup if the result would
83 // refer to a member of an unknown specialization.
84 if (!isClassName)
John McCallb3d87482010-08-24 05:47:05 +000085 return ParsedType();
Douglas Gregorf6e6fc82009-11-20 22:03:38 +000086
John McCall33500952010-06-11 00:33:02 +000087 // We know from the grammar that this name refers to a type,
88 // so build a dependent node to describe the type.
John McCallb3d87482010-08-24 05:47:05 +000089 QualType T =
90 CheckTypenameType(ETK_None, SS->getScopeRep(), II,
91 SourceLocation(), SS->getRange(), NameLoc);
92 return ParsedType::make(T);
Douglas Gregorf6e6fc82009-11-20 22:03:38 +000093 }
94
John McCallb3d87482010-08-24 05:47:05 +000095 return ParsedType();
Douglas Gregorf6e6fc82009-11-20 22:03:38 +000096 }
97
John McCall77bb1aa2010-05-01 00:40:08 +000098 if (!LookupCtx->isDependentContext() &&
99 RequireCompleteDeclContext(*SS, LookupCtx))
John McCallb3d87482010-08-24 05:47:05 +0000100 return ParsedType();
Douglas Gregor42c39f32009-08-26 18:27:52 +0000101 }
Eli Friedman0f0615b2009-12-21 01:42:38 +0000102
103 // FIXME: LookupNestedNameSpecifierName isn't the right kind of
104 // lookup for class-names.
105 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName :
106 LookupOrdinaryName;
107 LookupResult Result(*this, &II, NameLoc, Kind);
Douglas Gregorf6e6fc82009-11-20 22:03:38 +0000108 if (LookupCtx) {
109 // Perform "qualified" name lookup into the declaration context we
110 // computed, which is either the type of the base of a member access
111 // expression or the declaration context associated with a prior
112 // nested-name-specifier.
113 LookupQualifiedName(Result, LookupCtx);
Douglas Gregor42af25f2009-05-11 19:58:34 +0000114
Douglas Gregorf6e6fc82009-11-20 22:03:38 +0000115 if (ObjectTypePtr && Result.empty()) {
116 // C++ [basic.lookup.classref]p3:
117 // If the unqualified-id is ~type-name, the type-name is looked up
118 // in the context of the entire postfix-expression. If the type T of
119 // the object expression is of a class type C, the type-name is also
120 // looked up in the scope of class C. At least one of the lookups shall
121 // find a name that refers to (possibly cv-qualified) T.
122 LookupName(Result, S);
123 }
124 } else {
125 // Perform unqualified name lookup.
126 LookupName(Result, S);
127 }
128
Chris Lattner22bd9052009-02-16 22:07:16 +0000129 NamedDecl *IIDecl = 0;
John McCalla24dc2e2009-11-17 02:14:36 +0000130 switch (Result.getResultKind()) {
Chris Lattner22bd9052009-02-16 22:07:16 +0000131 case LookupResult::NotFound:
Douglas Gregor7d3f5762010-01-15 01:44:47 +0000132 case LookupResult::NotFoundInCurrentInstantiation:
Chris Lattner22bd9052009-02-16 22:07:16 +0000133 case LookupResult::FoundOverloaded:
John McCall7ba107a2009-11-18 02:36:19 +0000134 case LookupResult::FoundUnresolvedValue:
John McCallc373d482010-01-27 01:50:18 +0000135 Result.suppressDiagnostics();
John McCallb3d87482010-08-24 05:47:05 +0000136 return ParsedType();
Douglas Gregorb696ea32009-02-04 17:00:24 +0000137
Chris Lattnera64ef0a2009-10-25 22:09:09 +0000138 case LookupResult::Ambiguous:
John McCall6e247262009-10-10 05:48:19 +0000139 // Recover from type-hiding ambiguities by hiding the type. We'll
140 // do the lookup again when looking for an object, and we can
141 // diagnose the error then. If we don't do this, then the error
142 // about hiding the type will be immediately followed by an error
143 // that only makes sense if the identifier was treated like a type.
John McCalla24dc2e2009-11-17 02:14:36 +0000144 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) {
145 Result.suppressDiagnostics();
John McCallb3d87482010-08-24 05:47:05 +0000146 return ParsedType();
John McCalla24dc2e2009-11-17 02:14:36 +0000147 }
John McCall6e247262009-10-10 05:48:19 +0000148
Douglas Gregor31a19b62009-04-01 21:51:26 +0000149 // Look to see if we have a type anywhere in the list of results.
150 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end();
151 Res != ResEnd; ++Res) {
152 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) {
Mike Stump1eb44332009-09-09 15:08:12 +0000153 if (!IIDecl ||
154 (*Res)->getLocation().getRawEncoding() <
Douglas Gregor841b53c2009-04-13 15:14:38 +0000155 IIDecl->getLocation().getRawEncoding())
156 IIDecl = *Res;
Douglas Gregor31a19b62009-04-01 21:51:26 +0000157 }
158 }
159
160 if (!IIDecl) {
161 // None of the entities we found is a type, so there is no way
162 // to even assume that the result is a type. In this case, don't
163 // complain about the ambiguity. The parser will either try to
164 // perform this lookup again (e.g., as an object name), which
165 // will produce the ambiguity, or will complain that it expected
166 // a type name.
John McCalla24dc2e2009-11-17 02:14:36 +0000167 Result.suppressDiagnostics();
John McCallb3d87482010-08-24 05:47:05 +0000168 return ParsedType();
Douglas Gregor31a19b62009-04-01 21:51:26 +0000169 }
170
171 // We found a type within the ambiguous lookup; diagnose the
172 // ambiguity and then return that type. This might be the right
173 // answer, or it might not be, but it suppresses any attempt to
174 // perform the name lookup again.
Douglas Gregor31a19b62009-04-01 21:51:26 +0000175 break;
Douglas Gregorb696ea32009-02-04 17:00:24 +0000176
Chris Lattner22bd9052009-02-16 22:07:16 +0000177 case LookupResult::Found:
John McCallf36e02d2009-10-09 21:13:30 +0000178 IIDecl = Result.getFoundDecl();
Chris Lattner22bd9052009-02-16 22:07:16 +0000179 break;
Douglas Gregor7176fff2009-01-15 00:26:24 +0000180 }
181
Chris Lattner10ca3372009-10-25 17:16:46 +0000182 assert(IIDecl && "Didn't find decl");
John McCall54abf7d2009-11-04 02:18:39 +0000183
Chris Lattner10ca3372009-10-25 17:16:46 +0000184 QualType T;
185 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) {
John McCall54abf7d2009-11-04 02:18:39 +0000186 DiagnoseUseOfDecl(IIDecl, NameLoc);
John McCalla24dc2e2009-11-17 02:14:36 +0000187
Chris Lattner10ca3372009-10-25 17:16:46 +0000188 if (T.isNull())
189 T = Context.getTypeDeclType(TD);
190
Douglas Gregore6258932009-03-19 00:39:20 +0000191 if (SS)
Abramo Bagnara465d41b2010-05-11 21:36:43 +0000192 T = getElaboratedType(ETK_None, *SS, T);
Chris Lattner10ca3372009-10-25 17:16:46 +0000193
194 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) {
Chris Lattner10ca3372009-10-25 17:16:46 +0000195 T = Context.getObjCInterfaceType(IDecl);
John McCalla24dc2e2009-11-17 02:14:36 +0000196 } else {
197 // If it's not plausibly a type, suppress diagnostics.
198 Result.suppressDiagnostics();
John McCallb3d87482010-08-24 05:47:05 +0000199 return ParsedType();
John McCalla24dc2e2009-11-17 02:14:36 +0000200 }
Douglas Gregore4e5b052009-03-19 00:18:19 +0000201
John McCallb3d87482010-08-24 05:47:05 +0000202 return ParsedType::make(T);
Reid Spencer5f016e22007-07-11 17:01:13 +0000203}
204
Chris Lattner4c97d762009-04-12 21:49:30 +0000205/// isTagName() - This method is called *for error recovery purposes only*
206/// to determine if the specified name is a valid tag name ("struct foo"). If
207/// so, this returns the TST for the tag corresponding to it (TST_enum,
208/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C
209/// where the user forgot to specify the tag.
210DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) {
211 // Do a tag name lookup in this scope.
John McCalla24dc2e2009-11-17 02:14:36 +0000212 LookupResult R(*this, &II, SourceLocation(), LookupTagName);
213 LookupName(R, S, false);
214 R.suppressDiagnostics();
215 if (R.getResultKind() == LookupResult::Found)
John McCall1bcee0a2009-12-02 08:25:40 +0000216 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) {
Chris Lattner4c97d762009-04-12 21:49:30 +0000217 switch (TD->getTagKind()) {
Abramo Bagnara465d41b2010-05-11 21:36:43 +0000218 default: return DeclSpec::TST_unspecified;
219 case TTK_Struct: return DeclSpec::TST_struct;
220 case TTK_Union: return DeclSpec::TST_union;
221 case TTK_Class: return DeclSpec::TST_class;
222 case TTK_Enum: return DeclSpec::TST_enum;
Chris Lattner4c97d762009-04-12 21:49:30 +0000223 }
224 }
Mike Stump1eb44332009-09-09 15:08:12 +0000225
Chris Lattner4c97d762009-04-12 21:49:30 +0000226 return DeclSpec::TST_unspecified;
227}
228
Douglas Gregora786fdb2009-10-13 23:27:22 +0000229bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II,
230 SourceLocation IILoc,
231 Scope *S,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +0000232 CXXScopeSpec *SS,
John McCallb3d87482010-08-24 05:47:05 +0000233 ParsedType &SuggestedType) {
Douglas Gregora786fdb2009-10-13 23:27:22 +0000234 // We don't have anything to suggest (yet).
John McCallb3d87482010-08-24 05:47:05 +0000235 SuggestedType = ParsedType();
Douglas Gregora786fdb2009-10-13 23:27:22 +0000236
Douglas Gregor546be3c2009-12-30 17:04:44 +0000237 // There may have been a typo in the name of the type. Look up typo
238 // results, in case we have something that we can suggest.
239 LookupResult Lookup(*this, &II, IILoc, LookupOrdinaryName,
240 NotForRedeclaration);
241
Douglas Gregoraaf87162010-04-14 20:04:41 +0000242 if (DeclarationName Corrected = CorrectTypo(Lookup, S, SS, 0, 0, CTC_Type)) {
243 if (NamedDecl *Result = Lookup.getAsSingle<NamedDecl>()) {
244 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) &&
245 !Result->isInvalidDecl()) {
246 // We found a similarly-named type or interface; suggest that.
247 if (!SS || !SS->isSet())
248 Diag(IILoc, diag::err_unknown_typename_suggest)
249 << &II << Lookup.getLookupName()
250 << FixItHint::CreateReplacement(SourceRange(IILoc),
251 Result->getNameAsString());
252 else if (DeclContext *DC = computeDeclContext(*SS, false))
253 Diag(IILoc, diag::err_unknown_nested_typename_suggest)
254 << &II << DC << Lookup.getLookupName() << SS->getRange()
255 << FixItHint::CreateReplacement(SourceRange(IILoc),
256 Result->getNameAsString());
257 else
258 llvm_unreachable("could not have corrected a typo here");
Douglas Gregor546be3c2009-12-30 17:04:44 +0000259
Douglas Gregoraaf87162010-04-14 20:04:41 +0000260 Diag(Result->getLocation(), diag::note_previous_decl)
261 << Result->getDeclName();
262
263 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS);
264 return true;
265 }
266 } else if (Lookup.empty()) {
267 // We corrected to a keyword.
268 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it.
269 Diag(IILoc, diag::err_unknown_typename_suggest)
270 << &II << Corrected;
271 return true;
Douglas Gregor546be3c2009-12-30 17:04:44 +0000272 }
273 }
274
Jeffrey Yasskinc173be22010-04-08 21:04:54 +0000275 if (getLangOptions().CPlusPlus) {
276 // See if II is a class template that the user forgot to pass arguments to.
277 UnqualifiedId Name;
278 Name.setIdentifier(&II, IILoc);
279 CXXScopeSpec EmptySS;
280 TemplateTy TemplateResult;
Douglas Gregor1fd6d442010-05-21 23:18:07 +0000281 bool MemberOfUnknownSpecialization;
Abramo Bagnara7c153532010-08-06 12:11:11 +0000282 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false,
John McCallb3d87482010-08-24 05:47:05 +0000283 Name, ParsedType(), true, TemplateResult,
Douglas Gregor1fd6d442010-05-21 23:18:07 +0000284 MemberOfUnknownSpecialization) == TNK_Type_template) {
Jeffrey Yasskinc173be22010-04-08 21:04:54 +0000285 TemplateName TplName = TemplateResult.getAsVal<TemplateName>();
286 Diag(IILoc, diag::err_template_missing_args) << TplName;
287 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) {
288 Diag(TplDecl->getLocation(), diag::note_template_decl_here)
289 << TplDecl->getTemplateParameters()->getSourceRange();
290 }
291 return true;
292 }
293 }
294
Douglas Gregora786fdb2009-10-13 23:27:22 +0000295 // FIXME: Should we move the logic that tries to recover from a missing tag
296 // (struct, union, enum) from Parser::ParseImplicitInt here, instead?
297
Douglas Gregor546be3c2009-12-30 17:04:44 +0000298 if (!SS || (!SS->isSet() && !SS->isInvalid()))
Douglas Gregora786fdb2009-10-13 23:27:22 +0000299 Diag(IILoc, diag::err_unknown_typename) << &II;
300 else if (DeclContext *DC = computeDeclContext(*SS, false))
301 Diag(IILoc, diag::err_typename_nested_not_found)
302 << &II << DC << SS->getRange();
303 else if (isDependentScopeSpecifier(*SS)) {
304 Diag(SS->getRange().getBegin(), diag::err_typename_missing)
Daniel Dunbar01eb9b92009-10-18 21:17:35 +0000305 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName()
Douglas Gregora786fdb2009-10-13 23:27:22 +0000306 << SourceRange(SS->getRange().getBegin(), IILoc)
Douglas Gregor849b2432010-03-31 17:46:05 +0000307 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename ");
Douglas Gregor1a15dae2010-06-16 22:31:08 +0000308 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc).get();
Douglas Gregora786fdb2009-10-13 23:27:22 +0000309 } else {
310 assert(SS && SS->isInvalid() &&
311 "Invalid scope specifier has already been diagnosed");
312 }
313
314 return true;
315}
Chris Lattner4c97d762009-04-12 21:49:30 +0000316
John McCall88232aa2009-08-18 00:00:49 +0000317// Determines the context to return to after temporarily entering a
318// context. This depends in an unnecessarily complicated way on the
319// exact ordering of callbacks from the parser.
Argyrios Kyrtzidisef6e6472008-11-08 17:17:31 +0000320DeclContext *Sema::getContainingDC(DeclContext *DC) {
Argyrios Kyrtzidisef6e6472008-11-08 17:17:31 +0000321
John McCall88232aa2009-08-18 00:00:49 +0000322 // Functions defined inline within classes aren't parsed until we've
323 // finished parsing the top-level class, so the top-level class is
324 // the context we'll need to return to.
325 if (isa<FunctionDecl>(DC)) {
326 DC = DC->getLexicalParent();
327
328 // A function not defined within a class will always return to its
329 // lexical context.
330 if (!isa<CXXRecordDecl>(DC))
331 return DC;
332
333 // A C++ inline method/friend is parsed *after* the topmost class
334 // it was declared in is fully parsed ("complete"); the topmost
335 // class is the context we need to return to.
Argyrios Kyrtzidis77407b82008-11-19 18:01:13 +0000336 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent()))
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000337 DC = RD;
338
339 // Return the declaration context of the topmost class the inline method is
340 // declared in.
341 return DC;
342 }
343
John McCall9983d2d2010-08-06 00:46:05 +0000344 // ObjCMethodDecls are parsed (for some reason) outside the context
345 // of the class.
Argyrios Kyrtzidis52393042008-11-09 23:41:00 +0000346 if (isa<ObjCMethodDecl>(DC))
John McCall9983d2d2010-08-06 00:46:05 +0000347 return DC->getLexicalParent()->getLexicalParent();
Argyrios Kyrtzidis52393042008-11-09 23:41:00 +0000348
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);
John McCallacb70392010-07-23 22:45:07 +0000363 assert(CurContext && "Popped translation unit!");
Chris Lattner0ed844b2008-04-04 06:12:32 +0000364}
365
Argyrios Kyrtzidis179fe1a2009-06-17 23:19:02 +0000366/// EnterDeclaratorContext - Used when we must lookup names in the context
367/// of a declarator's nested name specifier.
John McCall7a1dc562009-12-19 10:49:29 +0000368///
Argyrios Kyrtzidis1d175532009-06-17 23:15:40 +0000369void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) {
John McCall7a1dc562009-12-19 10:49:29 +0000370 // C++0x [basic.lookup.unqual]p13:
371 // A name used in the definition of a static data member of class
372 // X (after the qualified-id of the static member) is looked up as
373 // if the name was used in a member function of X.
374 // C++0x [basic.lookup.unqual]p14:
375 // If a variable member of a namespace is defined outside of the
376 // scope of its namespace then any name used in the definition of
377 // the variable member (after the declarator-id) is looked up as
378 // if the definition of the variable member occurred in its
379 // namespace.
380 // Both of these imply that we should push a scope whose context
381 // is the semantic context of the declaration. We can't use
382 // PushDeclContext here because that context is not necessarily
383 // lexically contained in the current context. Fortunately,
384 // the containing scope should have the appropriate information.
385
386 assert(!S->getEntity() && "scope already has entity");
387
388#ifndef NDEBUG
389 Scope *Ancestor = S->getParent();
390 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent();
391 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch");
392#endif
393
Argyrios Kyrtzidis1d175532009-06-17 23:15:40 +0000394 CurContext = DC;
John McCall7a1dc562009-12-19 10:49:29 +0000395 S->setEntity(DC);
Argyrios Kyrtzidis1d175532009-06-17 23:15:40 +0000396}
397
Argyrios Kyrtzidis1d175532009-06-17 23:15:40 +0000398void Sema::ExitDeclaratorContext(Scope *S) {
John McCall7a1dc562009-12-19 10:49:29 +0000399 assert(S->getEntity() == CurContext && "Context imbalance!");
Argyrios Kyrtzidis1d175532009-06-17 23:15:40 +0000400
John McCall7a1dc562009-12-19 10:49:29 +0000401 // Switch back to the lexical context. The safety of this is
402 // enforced by an assert in EnterDeclaratorContext.
403 Scope *Ancestor = S->getParent();
404 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent();
405 CurContext = (DeclContext*) Ancestor->getEntity();
406
407 // We don't need to do anything with the scope, which is going to
408 // disappear.
Argyrios Kyrtzidis1d175532009-06-17 23:15:40 +0000409}
410
Douglas Gregorf9201e02009-02-11 23:02:49 +0000411/// \brief Determine whether we allow overloading of the function
412/// PrevDecl with another declaration.
413///
414/// This routine determines whether overloading is possible, not
415/// whether some new function is actually an overload. It will return
416/// true in C++ (where we can always provide overloads) or, as an
417/// extension, in C when the previous function is already an
418/// overloaded function declaration or has the "overloadable"
419/// attribute.
John McCall68263142009-11-18 22:49:29 +0000420static bool AllowOverloadingOfFunction(LookupResult &Previous,
421 ASTContext &Context) {
Douglas Gregorf9201e02009-02-11 23:02:49 +0000422 if (Context.getLangOptions().CPlusPlus)
423 return true;
424
John McCall68263142009-11-18 22:49:29 +0000425 if (Previous.getResultKind() == LookupResult::FoundOverloaded)
Douglas Gregorf9201e02009-02-11 23:02:49 +0000426 return true;
427
John McCall68263142009-11-18 22:49:29 +0000428 return (Previous.getResultKind() == LookupResult::Found
429 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>());
Douglas Gregorf9201e02009-02-11 23:02:49 +0000430}
431
Argyrios Kyrtzidis87f3ff02008-04-12 00:47:19 +0000432/// Add this decl to the scope shadowed decl chains.
John McCallab88d972009-08-31 22:39:49 +0000433void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) {
Douglas Gregor074149e2009-01-05 19:45:36 +0000434 // Move up the scope chain until we find the nearest enclosing
435 // non-transparent context. The declaration will be introduced into this
436 // scope.
Mike Stump1eb44332009-09-09 15:08:12 +0000437 while (S->getEntity() &&
Douglas Gregor074149e2009-01-05 19:45:36 +0000438 ((DeclContext *)S->getEntity())->isTransparentContext())
439 S = S->getParent();
440
Douglas Gregor6ed40e32008-12-23 21:05:05 +0000441 // Add scoped declarations into their context, so that they can be
442 // found later. Declarations without a context won't be inserted
443 // into any context.
John McCallab88d972009-08-31 22:39:49 +0000444 if (AddToContext)
445 CurContext->addDecl(D);
Douglas Gregor6ed40e32008-12-23 21:05:05 +0000446
Chandler Carruth8761d682010-02-21 07:08:09 +0000447 // Out-of-line definitions shouldn't be pushed into scope in C++.
448 // Out-of-line variable and function definitions shouldn't even in C.
449 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) &&
450 D->isOutOfLine())
451 return;
452
453 // Template instantiations should also not be pushed into scope.
454 if (isa<FunctionDecl>(D) &&
455 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization())
Douglas Gregord04b1be2009-09-28 18:41:37 +0000456 return;
457
John McCallf36e02d2009-10-09 21:13:30 +0000458 // If this replaces anything in the current scope,
459 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()),
460 IEnd = IdResolver.end();
461 for (; I != IEnd; ++I) {
John McCalld226f652010-08-21 09:40:31 +0000462 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) {
463 S->RemoveDecl(*I);
John McCallf36e02d2009-10-09 21:13:30 +0000464 IdResolver.RemoveDecl(*I);
Argyrios Kyrtzidis00bc6452008-05-09 23:39:43 +0000465
John McCallf36e02d2009-10-09 21:13:30 +0000466 // Should only need to replace one decl.
467 break;
Douglas Gregor516ff432009-04-24 02:57:34 +0000468 }
Argyrios Kyrtzidis00bc6452008-05-09 23:39:43 +0000469 }
Douglas Gregor8e9bebd2008-10-21 16:13:35 +0000470
John McCalld226f652010-08-21 09:40:31 +0000471 S->AddDecl(D);
Argyrios Kyrtzidis00bc6452008-05-09 23:39:43 +0000472 IdResolver.AddDecl(D);
Argyrios Kyrtzidis87f3ff02008-04-12 00:47:19 +0000473}
474
Douglas Gregor2531c2d2009-09-28 00:47:05 +0000475bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S) {
Douglas Gregor2531c2d2009-09-28 00:47:05 +0000476 return IdResolver.isDeclInScope(D, Ctx, Context, S);
477}
478
John McCall5f1e0942010-08-24 08:50:51 +0000479Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) {
480 DeclContext *TargetDC = DC->getPrimaryContext();
481 do {
482 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity())
483 if (ScopeDC->getPrimaryContext() == TargetDC)
484 return S;
485 } while ((S = S->getParent()));
486
487 return 0;
488}
489
John McCall68263142009-11-18 22:49:29 +0000490static bool isOutOfScopePreviousDeclaration(NamedDecl *,
491 DeclContext*,
492 ASTContext&);
493
494/// Filters out lookup results that don't fall within the given scope
495/// as determined by isDeclInScope.
496static void FilterLookupForScope(Sema &SemaRef, LookupResult &R,
497 DeclContext *Ctx, Scope *S,
498 bool ConsiderLinkage) {
499 LookupResult::Filter F = R.makeFilter();
500 while (F.hasNext()) {
501 NamedDecl *D = F.next();
502
503 if (SemaRef.isDeclInScope(D, Ctx, S))
504 continue;
505
506 if (ConsiderLinkage &&
507 isOutOfScopePreviousDeclaration(D, Ctx, SemaRef.Context))
508 continue;
509
510 F.erase();
511 }
512
513 F.done();
514}
515
516static bool isUsingDecl(NamedDecl *D) {
517 return isa<UsingShadowDecl>(D) ||
518 isa<UnresolvedUsingTypenameDecl>(D) ||
519 isa<UnresolvedUsingValueDecl>(D);
520}
521
522/// Removes using shadow declarations from the lookup results.
523static void RemoveUsingDecls(LookupResult &R) {
524 LookupResult::Filter F = R.makeFilter();
525 while (F.hasNext())
526 if (isUsingDecl(F.next()))
527 F.erase();
528
529 F.done();
530}
531
Argyrios Kyrtzidis06999f82010-08-15 10:17:33 +0000532/// \brief Check for this common pattern:
533/// @code
534/// class S {
535/// S(const S&); // DO NOT IMPLEMENT
536/// void operator=(const S&); // DO NOT IMPLEMENT
537/// };
538/// @endcode
539static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) {
540 // FIXME: Should check for private access too but access is set after we get
541 // the decl here.
542 if (D->isThisDeclarationADefinition())
543 return false;
544
545 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D))
546 return CD->isCopyConstructor();
547 return D->isCopyAssignment();
548}
549
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +0000550bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const {
551 assert(D);
Argyrios Kyrtzidisf6d1d432010-08-13 18:42:29 +0000552
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +0000553 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>())
554 return false;
555
556 // Ignore class templates.
557 if (D->getDeclContext()->isDependentContext())
558 return false;
559
560 // We warn for unused decls internal to the translation unit.
561 if (D->getLinkage() == ExternalLinkage)
562 return false;
563
564 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
Argyrios Kyrtzidis06999f82010-08-15 10:17:33 +0000565 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation)
566 return false;
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +0000567
Argyrios Kyrtzidis06999f82010-08-15 10:17:33 +0000568 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
569 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD))
570 return false;
571 } else {
572 // 'static inline' functions are used in headers; don't warn.
John McCalld931b082010-08-26 03:08:43 +0000573 if (FD->getStorageClass() == SC_Static &&
Argyrios Kyrtzidis06999f82010-08-15 10:17:33 +0000574 FD->isInlineSpecified())
575 return false;
576 }
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +0000577
578 if (FD->isThisDeclarationADefinition())
579 return !Context.DeclMustBeEmitted(FD);
580 return true;
Argyrios Kyrtzidis06999f82010-08-15 10:17:33 +0000581 }
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +0000582
583 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
584 if (VD->isStaticDataMember() &&
585 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation)
586 return false;
587
588 if ( VD->isFileVarDecl() &&
589 !VD->getType().isConstant(Context))
590 return !Context.DeclMustBeEmitted(VD);
591 }
592
593 return false;
594 }
595
596 void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) {
597 if (!D)
598 return;
599
600 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
601 const FunctionDecl *First = FD->getFirstDeclaration();
602 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First))
603 return; // First should already be in the vector.
604 }
605
606 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
607 const VarDecl *First = VD->getFirstDeclaration();
608 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First))
609 return; // First should already be in the vector.
610 }
611
612 if (ShouldWarnIfUnusedFileScopedDecl(D))
613 UnusedFileScopedDecls.push_back(D);
614 }
Argyrios Kyrtzidis49b96d12010-08-13 18:42:17 +0000615
Anders Carlsson99a000e2009-11-07 07:18:14 +0000616static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) {
John McCall86ff3082010-02-04 22:26:26 +0000617 if (D->isInvalidDecl())
618 return false;
619
Anders Carlssonf7613d52009-11-07 07:26:56 +0000620 if (D->isUsed() || D->hasAttr<UnusedAttr>())
621 return false;
John McCall86ff3082010-02-04 22:26:26 +0000622
623 // White-list anything that isn't a local variable.
624 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) ||
625 !D->getDeclContext()->isFunctionOrMethod())
626 return false;
627
628 // Types of valid local variables should be complete, so this should succeed.
Anders Carlssonf7613d52009-11-07 07:26:56 +0000629 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) {
John McCallaec58602010-03-31 02:47:45 +0000630
631 // White-list anything with an __attribute__((unused)) type.
632 QualType Ty = VD->getType();
633
634 // Only look at the outermost level of typedef.
635 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) {
636 if (TT->getDecl()->hasAttr<UnusedAttr>())
637 return false;
638 }
639
Douglas Gregor5764f612010-05-08 23:05:03 +0000640 // If we failed to complete the type for some reason, or if the type is
641 // dependent, don't diagnose the variable.
642 if (Ty->isIncompleteType() || Ty->isDependentType())
Douglas Gregora6a292b2010-04-27 16:20:13 +0000643 return false;
644
John McCallaec58602010-03-31 02:47:45 +0000645 if (const TagType *TT = Ty->getAs<TagType>()) {
646 const TagDecl *Tag = TT->getDecl();
647 if (Tag->hasAttr<UnusedAttr>())
648 return false;
649
650 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) {
Douglas Gregor5764f612010-05-08 23:05:03 +0000651 // FIXME: Checking for the presence of a user-declared constructor
652 // isn't completely accurate; we'd prefer to check that the initializer
653 // has no side effects.
654 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor())
Anders Carlssonf7613d52009-11-07 07:26:56 +0000655 return false;
656 }
657 }
John McCallaec58602010-03-31 02:47:45 +0000658
659 // TODO: __attribute__((unused)) templates?
Anders Carlssonf7613d52009-11-07 07:26:56 +0000660 }
661
John McCall86ff3082010-02-04 22:26:26 +0000662 return true;
Anders Carlsson99a000e2009-11-07 07:18:14 +0000663}
664
Douglas Gregor5764f612010-05-08 23:05:03 +0000665void Sema::DiagnoseUnusedDecl(const NamedDecl *D) {
666 if (!ShouldDiagnoseUnusedDecl(D))
667 return;
668
669 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable())
670 Diag(D->getLocation(), diag::warn_unused_exception_param)
671 << D->getDeclName();
672 else
673 Diag(D->getLocation(), diag::warn_unused_variable)
674 << D->getDeclName();
675}
676
Steve Naroffb216c882007-10-09 22:01:59 +0000677void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) {
Chris Lattner31e05722007-08-26 06:24:45 +0000678 if (S->decl_empty()) return;
Douglas Gregor72c3f312008-12-05 18:15:24 +0000679 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) &&
Mike Stump1eb44332009-09-09 15:08:12 +0000680 "Scope shouldn't contain decls!");
Argyrios Kyrtzidis00bc6452008-05-09 23:39:43 +0000681
Reid Spencer5f016e22007-07-11 17:01:13 +0000682 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end();
683 I != E; ++I) {
John McCalld226f652010-08-21 09:40:31 +0000684 Decl *TmpD = (*I);
Steve Naroffc752d042007-09-13 18:10:37 +0000685 assert(TmpD && "This decl didn't get pushed??");
Argyrios Kyrtzidis76435362008-06-10 01:32:09 +0000686
Douglas Gregor44b43212008-12-11 16:49:14 +0000687 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?");
688 NamedDecl *D = cast<NamedDecl>(TmpD);
Argyrios Kyrtzidis76435362008-06-10 01:32:09 +0000689
Douglas Gregor44b43212008-12-11 16:49:14 +0000690 if (!D->getDeclName()) continue;
Chris Lattner7f925cc2008-04-11 07:00:53 +0000691
Douglas Gregorb5352cf2009-10-08 21:35:42 +0000692 // Diagnose unused variables in this scope.
Douglas Gregor5764f612010-05-08 23:05:03 +0000693 if (S->getNumErrorsAtStart() == getDiagnostics().getNumErrors())
694 DiagnoseUnusedDecl(D);
695
Douglas Gregor44b43212008-12-11 16:49:14 +0000696 // Remove this name from our lexical scope.
697 IdResolver.RemoveDecl(D);
Reid Spencer5f016e22007-07-11 17:01:13 +0000698 }
699}
700
Douglas Gregordeacbdc2010-08-11 12:19:30 +0000701/// \brief Look for an Objective-C class in the translation unit.
702///
703/// \param Id The name of the Objective-C class we're looking for. If
704/// typo-correction fixes this name, the Id will be updated
705/// to the fixed name.
706///
707/// \param IdLoc The location of the name in the translation unit.
708///
709/// \param TypoCorrection If true, this routine will attempt typo correction
710/// if there is no class with the given name.
711///
712/// \returns The declaration of the named Objective-C class, or NULL if the
713/// class could not be found.
714ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id,
715 SourceLocation IdLoc,
716 bool TypoCorrection) {
717 // The third "scope" argument is 0 since we aren't enabling lazy built-in
718 // creation from this context.
719 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName);
720
721 if (!IDecl && TypoCorrection) {
722 // Perform typo correction at the given location, but only if we
723 // find an Objective-C class name.
724 LookupResult R(*this, Id, IdLoc, LookupOrdinaryName);
725 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) &&
726 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) {
727 Diag(IdLoc, diag::err_undef_interface_suggest)
728 << Id << IDecl->getDeclName()
729 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString());
730 Diag(IDecl->getLocation(), diag::note_previous_decl)
731 << IDecl->getDeclName();
732
733 Id = IDecl->getIdentifier();
734 }
735 }
736
737 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl);
738}
739
Douglas Gregor1a0d31a2009-01-12 18:45:55 +0000740/// getNonFieldDeclScope - Retrieves the innermost scope, starting
741/// from S, where a non-field would be declared. This routine copes
742/// with the difference between C and C++ scoping rules in structs and
743/// unions. For example, the following code is well-formed in C but
744/// ill-formed in C++:
745/// @code
746/// struct S6 {
747/// enum { BAR } e;
748/// };
Mike Stump1eb44332009-09-09 15:08:12 +0000749///
Douglas Gregor1a0d31a2009-01-12 18:45:55 +0000750/// void test_S6() {
751/// struct S6 a;
752/// a.e = BAR;
753/// }
754/// @endcode
755/// For the declaration of BAR, this routine will return a different
756/// scope. The scope S will be the scope of the unnamed enumeration
757/// within S6. In C++, this routine will return the scope associated
758/// with S6, because the enumeration's scope is a transparent
759/// context but structures can contain non-field names. In C, this
760/// routine will return the translation unit scope, since the
761/// enumeration's scope is a transparent context and structures cannot
762/// contain non-field names.
763Scope *Sema::getNonFieldDeclScope(Scope *S) {
764 while (((S->getFlags() & Scope::DeclScope) == 0) ||
Mike Stump1eb44332009-09-09 15:08:12 +0000765 (S->getEntity() &&
Douglas Gregor1a0d31a2009-01-12 18:45:55 +0000766 ((DeclContext *)S->getEntity())->isTransparentContext()) ||
767 (S->isClassScope() && !getLangOptions().CPlusPlus))
768 S = S->getParent();
769 return S;
770}
771
Chris Lattner95e2c712008-05-05 22:18:14 +0000772void Sema::InitBuiltinVaListType() {
Anders Carlsson7c50aca2007-10-15 20:28:48 +0000773 if (!Context.getBuiltinVaListType().isNull())
774 return;
Mike Stump1eb44332009-09-09 15:08:12 +0000775
Anders Carlsson7c50aca2007-10-15 20:28:48 +0000776 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list");
Douglas Gregorc83c6872010-04-15 22:33:43 +0000777 NamedDecl *VaDecl = LookupSingleName(TUScope, VaIdent, SourceLocation(),
778 LookupOrdinaryName, ForRedeclaration);
Steve Naroff733002f2007-10-18 22:17:45 +0000779 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl);
Anders Carlsson7c50aca2007-10-15 20:28:48 +0000780 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef));
781}
782
Douglas Gregor3e41d602009-02-13 23:20:09 +0000783/// LazilyCreateBuiltin - The specified Builtin-ID was first used at
784/// file scope. lazily create a decl for it. ForRedeclaration is true
785/// if we're creating this built-in in anticipation of redeclaring the
786/// built-in.
Douglas Gregor4afa39d2009-01-20 01:17:11 +0000787NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid,
Douglas Gregor3e41d602009-02-13 23:20:09 +0000788 Scope *S, bool ForRedeclaration,
789 SourceLocation Loc) {
Reid Spencer5f016e22007-07-11 17:01:13 +0000790 Builtin::ID BID = (Builtin::ID)bid;
791
Chris Lattnerbd7eb1c2008-09-28 05:54:29 +0000792 if (Context.BuiltinInfo.hasVAListUse(BID))
Anders Carlsson7c50aca2007-10-15 20:28:48 +0000793 InitBuiltinVaListType();
Douglas Gregor3e41d602009-02-13 23:20:09 +0000794
Chris Lattner86df27b2009-06-14 00:45:47 +0000795 ASTContext::GetBuiltinTypeError Error;
Mike Stump1eb44332009-09-09 15:08:12 +0000796 QualType R = Context.GetBuiltinType(BID, Error);
Douglas Gregor370ab3f2009-02-14 01:52:53 +0000797 switch (Error) {
Chris Lattner86df27b2009-06-14 00:45:47 +0000798 case ASTContext::GE_None:
Douglas Gregor370ab3f2009-02-14 01:52:53 +0000799 // Okay
800 break;
801
Mike Stumpf711c412009-07-28 23:57:15 +0000802 case ASTContext::GE_Missing_stdio:
Douglas Gregor370ab3f2009-02-14 01:52:53 +0000803 if (ForRedeclaration)
804 Diag(Loc, diag::err_implicit_decl_requires_stdio)
805 << Context.BuiltinInfo.GetName(BID);
806 return 0;
Mike Stump782fa302009-07-28 02:25:19 +0000807
Mike Stumpf711c412009-07-28 23:57:15 +0000808 case ASTContext::GE_Missing_setjmp:
Mike Stump782fa302009-07-28 02:25:19 +0000809 if (ForRedeclaration)
810 Diag(Loc, diag::err_implicit_decl_requires_setjmp)
811 << Context.BuiltinInfo.GetName(BID);
812 return 0;
Douglas Gregor370ab3f2009-02-14 01:52:53 +0000813 }
Douglas Gregor3e41d602009-02-13 23:20:09 +0000814
815 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) {
816 Diag(Loc, diag::ext_implicit_lib_function_decl)
817 << Context.BuiltinInfo.GetName(BID)
818 << R;
Douglas Gregorb1152d82009-02-16 21:58:21 +0000819 if (Context.BuiltinInfo.getHeaderName(BID) &&
Chris Lattner6a7334d2009-04-16 03:59:32 +0000820 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl)
821 != Diagnostic::Ignored)
Douglas Gregor3e41d602009-02-13 23:20:09 +0000822 Diag(Loc, diag::note_please_include_header)
823 << Context.BuiltinInfo.getHeaderName(BID)
824 << Context.BuiltinInfo.GetName(BID);
825 }
826
Argyrios Kyrtzidisff898cd2008-04-17 14:47:13 +0000827 FunctionDecl *New = FunctionDecl::Create(Context,
828 Context.getTranslationUnitDecl(),
John McCalla93c9342009-12-07 02:54:59 +0000829 Loc, II, R, /*TInfo=*/0,
John McCalld931b082010-08-26 03:08:43 +0000830 SC_Extern,
831 SC_None, false,
Douglas Gregor2224f842009-02-25 16:33:18 +0000832 /*hasPrototype=*/true);
Douglas Gregor3e41d602009-02-13 23:20:09 +0000833 New->setImplicit();
834
Chris Lattner95e2c712008-05-05 22:18:14 +0000835 // Create Decl objects for each parameter, adding them to the
836 // FunctionDecl.
Douglas Gregor72564e72009-02-26 23:50:07 +0000837 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) {
Chris Lattner95e2c712008-05-05 22:18:14 +0000838 llvm::SmallVector<ParmVarDecl*, 16> Params;
839 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i)
840 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0,
John McCalla93c9342009-12-07 02:54:59 +0000841 FT->getArgType(i), /*TInfo=*/0,
John McCalld931b082010-08-26 03:08:43 +0000842 SC_None, SC_None, 0));
Douglas Gregor838db382010-02-11 01:19:42 +0000843 New->setParams(Params.data(), Params.size());
Chris Lattner95e2c712008-05-05 22:18:14 +0000844 }
Mike Stump1eb44332009-09-09 15:08:12 +0000845
846 AddKnownFunctionAttributes(New);
847
Chris Lattner7f925cc2008-04-11 07:00:53 +0000848 // TUScope is the translation-unit scope to insert this function into.
Douglas Gregora8cc8ce2009-01-09 18:51:29 +0000849 // FIXME: This is hideous. We need to teach PushOnScopeChains to
850 // relate Scopes to DeclContexts, and probably eliminate CurContext
851 // entirely, but we're not there yet.
852 DeclContext *SavedContext = CurContext;
853 CurContext = Context.getTranslationUnitDecl();
Argyrios Kyrtzidis00bc6452008-05-09 23:39:43 +0000854 PushOnScopeChains(New, TUScope);
Douglas Gregora8cc8ce2009-01-09 18:51:29 +0000855 CurContext = SavedContext;
Reid Spencer5f016e22007-07-11 17:01:13 +0000856 return New;
857}
858
Douglas Gregorcda9c672009-02-16 17:45:42 +0000859/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the
860/// same name and scope as a previous declaration 'Old'. Figure out
861/// how to resolve this situation, merging decls or emitting
Chris Lattnereaaebc72009-04-25 08:06:05 +0000862/// diagnostics as appropriate. If there was an error, set New to be invalid.
Reid Spencer5f016e22007-07-11 17:01:13 +0000863///
John McCall68263142009-11-18 22:49:29 +0000864void Sema::MergeTypeDefDecl(TypedefDecl *New, LookupResult &OldDecls) {
865 // If the new decl is known invalid already, don't bother doing any
866 // merging checks.
867 if (New->isInvalidDecl()) return;
Mike Stump1eb44332009-09-09 15:08:12 +0000868
Steve Naroff2b255c42008-09-09 14:32:20 +0000869 // Allow multiple definitions for ObjC built-in typedefs.
870 // FIXME: Verify the underlying types are equivalent!
871 if (getLangOptions().ObjC1) {
Chris Lattner2bac0f62008-11-20 05:41:43 +0000872 const IdentifierInfo *TypeID = New->getIdentifier();
873 switch (TypeID->getLength()) {
874 default: break;
Mike Stump1eb44332009-09-09 15:08:12 +0000875 case 2:
Chris Lattner2bac0f62008-11-20 05:41:43 +0000876 if (!TypeID->isStr("id"))
877 break;
David Chisnall0f436562009-08-17 16:35:33 +0000878 Context.ObjCIdRedefinitionType = New->getUnderlyingType();
Steve Naroff14108da2009-07-10 23:34:53 +0000879 // Install the built-in type for 'id', ignoring the current definition.
880 New->setTypeForDecl(Context.getObjCIdType().getTypePtr());
881 return;
Chris Lattner2bac0f62008-11-20 05:41:43 +0000882 case 5:
883 if (!TypeID->isStr("Class"))
884 break;
David Chisnall0f436562009-08-17 16:35:33 +0000885 Context.ObjCClassRedefinitionType = New->getUnderlyingType();
Steve Naroff14108da2009-07-10 23:34:53 +0000886 // Install the built-in type for 'Class', ignoring the current definition.
887 New->setTypeForDecl(Context.getObjCClassType().getTypePtr());
Chris Lattnereaaebc72009-04-25 08:06:05 +0000888 return;
Chris Lattner2bac0f62008-11-20 05:41:43 +0000889 case 3:
890 if (!TypeID->isStr("SEL"))
891 break;
Fariborz Jahanian369a3bd2009-11-25 23:07:42 +0000892 Context.ObjCSelRedefinitionType = New->getUnderlyingType();
Fariborz Jahanian13dcd002009-11-21 19:53:08 +0000893 // Install the built-in type for 'SEL', ignoring the current definition.
894 New->setTypeForDecl(Context.getObjCSelType().getTypePtr());
Chris Lattnereaaebc72009-04-25 08:06:05 +0000895 return;
Chris Lattner2bac0f62008-11-20 05:41:43 +0000896 case 8:
897 if (!TypeID->isStr("Protocol"))
898 break;
Steve Naroff2b255c42008-09-09 14:32:20 +0000899 Context.setObjCProtoType(New->getUnderlyingType());
Chris Lattnereaaebc72009-04-25 08:06:05 +0000900 return;
Steve Naroff2b255c42008-09-09 14:32:20 +0000901 }
902 // Fall through - the typedef name was not a builtin type.
903 }
John McCall68263142009-11-18 22:49:29 +0000904
Douglas Gregor66973122009-01-28 17:15:10 +0000905 // Verify the old decl was also a type.
John McCall5126fd02009-12-30 00:31:22 +0000906 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>();
907 if (!Old) {
Mike Stump1eb44332009-09-09 15:08:12 +0000908 Diag(New->getLocation(), diag::err_redefinition_different_kind)
Chris Lattner08631c52008-11-23 21:45:46 +0000909 << New->getDeclName();
John McCall68263142009-11-18 22:49:29 +0000910
911 NamedDecl *OldD = OldDecls.getRepresentativeDecl();
Chris Lattnereaaebc72009-04-25 08:06:05 +0000912 if (OldD->getLocation().isValid())
Fariborz Jahanianc55a2402009-01-16 19:58:32 +0000913 Diag(OldD->getLocation(), diag::note_previous_definition);
John McCall68263142009-11-18 22:49:29 +0000914
Chris Lattnereaaebc72009-04-25 08:06:05 +0000915 return New->setInvalidDecl();
Reid Spencer5f016e22007-07-11 17:01:13 +0000916 }
Douglas Gregor66973122009-01-28 17:15:10 +0000917
John McCall68263142009-11-18 22:49:29 +0000918 // If the old declaration is invalid, just give up here.
919 if (Old->isInvalidDecl())
920 return New->setInvalidDecl();
921
Mike Stump1eb44332009-09-09 15:08:12 +0000922 // Determine the "old" type we'll use for checking and diagnostics.
Douglas Gregor66973122009-01-28 17:15:10 +0000923 QualType OldType;
924 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old))
925 OldType = OldTypedef->getUnderlyingType();
926 else
927 OldType = Context.getTypeDeclType(Old);
928
Chris Lattner99cb9972008-07-25 18:44:27 +0000929 // If the typedef types are not identical, reject them in all languages and
930 // with any extensions enabled.
Douglas Gregor66973122009-01-28 17:15:10 +0000931
Mike Stump1eb44332009-09-09 15:08:12 +0000932 if (OldType != New->getUnderlyingType() &&
933 Context.getCanonicalType(OldType) !=
Chris Lattner99cb9972008-07-25 18:44:27 +0000934 Context.getCanonicalType(New->getUnderlyingType())) {
Chris Lattner5dc266a2008-11-20 06:13:02 +0000935 Diag(New->getLocation(), diag::err_redefinition_different_typedef)
Douglas Gregor66973122009-01-28 17:15:10 +0000936 << New->getUnderlyingType() << OldType;
Chris Lattnereaaebc72009-04-25 08:06:05 +0000937 if (Old->getLocation().isValid())
Fariborz Jahanianc55a2402009-01-16 19:58:32 +0000938 Diag(Old->getLocation(), diag::note_previous_definition);
Chris Lattnereaaebc72009-04-25 08:06:05 +0000939 return New->setInvalidDecl();
Chris Lattner99cb9972008-07-25 18:44:27 +0000940 }
Mike Stump1eb44332009-09-09 15:08:12 +0000941
John McCall5126fd02009-12-30 00:31:22 +0000942 // The types match. Link up the redeclaration chain if the old
943 // declaration was a typedef.
944 // FIXME: this is a potential source of wierdness if the type
945 // spellings don't match exactly.
946 if (isa<TypedefDecl>(Old))
947 New->setPreviousDeclaration(cast<TypedefDecl>(Old));
948
Steve Naroff14108da2009-07-10 23:34:53 +0000949 if (getLangOptions().Microsoft)
Chris Lattnereaaebc72009-04-25 08:06:05 +0000950 return;
Eli Friedman54ecfce2008-06-11 06:20:39 +0000951
Chris Lattner32b06752009-04-17 22:04:20 +0000952 if (getLangOptions().CPlusPlus) {
Douglas Gregor93dda722010-01-11 21:54:40 +0000953 // C++ [dcl.typedef]p2:
954 // In a given non-class scope, a typedef specifier can be used to
955 // redefine the name of any type declared in that scope to refer
956 // to the type to which it already refers.
Chris Lattner32b06752009-04-17 22:04:20 +0000957 if (!isa<CXXRecordDecl>(CurContext))
Chris Lattnereaaebc72009-04-25 08:06:05 +0000958 return;
Douglas Gregor93dda722010-01-11 21:54:40 +0000959
960 // C++0x [dcl.typedef]p4:
961 // In a given class scope, a typedef specifier can be used to redefine
962 // any class-name declared in that scope that is not also a typedef-name
963 // to refer to the type to which it already refers.
964 //
965 // This wording came in via DR424, which was a correction to the
966 // wording in DR56, which accidentally banned code like:
967 //
968 // struct S {
969 // typedef struct A { } A;
970 // };
971 //
972 // in the C++03 standard. We implement the C++0x semantics, which
973 // allow the above but disallow
974 //
975 // struct S {
976 // typedef int I;
977 // typedef int I;
978 // };
979 //
980 // since that was the intent of DR56.
Douglas Gregor05f65002010-01-11 22:30:10 +0000981 if (!isa<TypedefDecl >(Old))
Douglas Gregor93dda722010-01-11 21:54:40 +0000982 return;
983
Chris Lattner32b06752009-04-17 22:04:20 +0000984 Diag(New->getLocation(), diag::err_redefinition)
985 << New->getDeclName();
986 Diag(Old->getLocation(), diag::note_previous_definition);
Chris Lattnereaaebc72009-04-25 08:06:05 +0000987 return New->setInvalidDecl();
Daniel Dunbar2fe09972008-09-12 18:10:20 +0000988 }
Eli Friedman54ecfce2008-06-11 06:20:39 +0000989
Chris Lattner32b06752009-04-17 22:04:20 +0000990 // If we have a redefinition of a typedef in C, emit a warning. This warning
991 // is normally mapped to an error, but can be controlled with
Eli Friedman340a4e52009-06-04 23:03:07 +0000992 // -Wtypedef-redefinition. If either the original or the redefinition is
993 // in a system header, don't emit this for compatibility with GCC.
Chris Lattner6d97e5e2010-03-01 20:59:53 +0000994 if (getDiagnostics().getSuppressSystemWarnings() &&
Eli Friedman340a4e52009-06-04 23:03:07 +0000995 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) ||
996 Context.getSourceManager().isInSystemHeader(New->getLocation())))
Chris Lattnerd0359af2009-04-27 01:46:12 +0000997 return;
Mike Stump1eb44332009-09-09 15:08:12 +0000998
Chris Lattner32b06752009-04-17 22:04:20 +0000999 Diag(New->getLocation(), diag::warn_redefinition_of_typedef)
1000 << New->getDeclName();
Chris Lattner5f4a6822008-11-23 23:12:31 +00001001 Diag(Old->getLocation(), diag::note_previous_definition);
Chris Lattnereaaebc72009-04-25 08:06:05 +00001002 return;
Reid Spencer5f016e22007-07-11 17:01:13 +00001003}
1004
Chris Lattner6b6b5372008-06-26 18:38:35 +00001005/// DeclhasAttr - returns true if decl Declaration already has the target
1006/// attribute.
Mike Stump1eb44332009-09-09 15:08:12 +00001007static bool
Sean Huntcf807c42010-08-18 23:23:40 +00001008DeclHasAttr(const Decl *D, const Attr *A) {
1009 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A);
1010 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i)
1011 if ((*i)->getKind() == A->getKind()) {
1012 // FIXME: Don't hardcode this check
1013 if (OA && isa<OwnershipAttr>(*i))
1014 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind();
Chris Lattnerddee4232008-03-03 03:28:21 +00001015 return true;
Sean Huntcf807c42010-08-18 23:23:40 +00001016 }
Chris Lattnerddee4232008-03-03 03:28:21 +00001017
1018 return false;
1019}
1020
Sean Huntcf807c42010-08-18 23:23:40 +00001021/// MergeDeclAttributes - append attributes from the Old decl to the New one.
1022static void MergeDeclAttributes(Decl *New, Decl *Old, ASTContext &C) {
1023 if (!Old->hasAttrs())
1024 return;
1025 // Ensure that any moving of objects within the allocated map is done before
1026 // we process them.
1027 if (!New->hasAttrs())
1028 New->setAttrs(AttrVec());
1029 for (Decl::attr_iterator i = Old->attr_begin(), e = Old->attr_end(); i != e;
1030 ++i) {
1031 // FIXME: Make this more general than just checking for Overloadable.
1032 if (!DeclHasAttr(New, *i) && (*i)->getKind() != attr::Overloadable) {
1033 Attr *NewAttr = (*i)->clone(C);
Douglas Gregor9f9bf252009-04-28 06:37:30 +00001034 NewAttr->setInherited(true);
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00001035 New->addAttr(NewAttr);
Chris Lattnerddee4232008-03-03 03:28:21 +00001036 }
1037 }
1038}
1039
Dan Gohman3c46e8d2010-07-26 21:25:24 +00001040namespace {
1041
Douglas Gregorc8376562009-03-06 22:43:54 +00001042/// Used in MergeFunctionDecl to keep track of function parameters in
1043/// C.
1044struct GNUCompatibleParamWarning {
1045 ParmVarDecl *OldParm;
1046 ParmVarDecl *NewParm;
1047 QualType PromotedType;
1048};
1049
Dan Gohman3c46e8d2010-07-26 21:25:24 +00001050}
Anders Carlsson5c478cf2009-12-04 22:33:25 +00001051
1052/// getSpecialMember - get the special member enum for a method.
Anders Carlsson3b8c53b2010-04-22 05:40:53 +00001053Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) {
Anders Carlsson5c478cf2009-12-04 22:33:25 +00001054 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) {
Douglas Gregor9e9199d2009-12-22 00:34:07 +00001055 if (Ctor->isCopyConstructor())
Anders Carlsson5c478cf2009-12-04 22:33:25 +00001056 return Sema::CXXCopyConstructor;
Anders Carlsson3b8c53b2010-04-22 05:40:53 +00001057
1058 return Sema::CXXConstructor;
Anders Carlsson5c478cf2009-12-04 22:33:25 +00001059 }
1060
1061 if (isa<CXXDestructorDecl>(MD))
1062 return Sema::CXXDestructor;
1063
1064 assert(MD->isCopyAssignment() && "Must have copy assignment operator");
1065 return Sema::CXXCopyAssignment;
1066}
1067
Sebastian Redl515ddd82010-06-09 21:17:41 +00001068/// canRedefineFunction - checks if a function can be redefined. Currently,
Charles Davisf3f8d2a2010-02-18 02:00:42 +00001069/// only extern inline functions can be redefined, and even then only in
1070/// GNU89 mode.
1071static bool canRedefineFunction(const FunctionDecl *FD,
1072 const LangOptions& LangOpts) {
1073 return (LangOpts.GNUMode && !LangOpts.C99 && !LangOpts.CPlusPlus &&
1074 FD->isInlineSpecified() &&
John McCalld931b082010-08-26 03:08:43 +00001075 FD->getStorageClass() == SC_Extern);
Charles Davisf3f8d2a2010-02-18 02:00:42 +00001076}
1077
Chris Lattner04421082008-04-08 04:40:51 +00001078/// MergeFunctionDecl - We just parsed a function 'New' from
1079/// declarator D which has the same name and scope as a previous
1080/// declaration 'Old'. Figure out how to resolve this situation,
1081/// merging decls or emitting diagnostics as appropriate.
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00001082///
1083/// In C++, New and Old must be declarations that are not
1084/// overloaded. Use IsOverload to determine whether New and Old are
1085/// overloaded, and to select the Old declaration that New should be
1086/// merged with.
Douglas Gregorcda9c672009-02-16 17:45:42 +00001087///
1088/// Returns true if there was an error, false otherwise.
1089bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) {
Reid Spencer5f016e22007-07-11 17:01:13 +00001090 // Verify the old decl was also a function.
Douglas Gregore53060f2009-06-25 22:08:12 +00001091 FunctionDecl *Old = 0;
Mike Stump1eb44332009-09-09 15:08:12 +00001092 if (FunctionTemplateDecl *OldFunctionTemplate
Douglas Gregore53060f2009-06-25 22:08:12 +00001093 = dyn_cast<FunctionTemplateDecl>(OldD))
1094 Old = OldFunctionTemplate->getTemplatedDecl();
Mike Stump1eb44332009-09-09 15:08:12 +00001095 else
Douglas Gregore53060f2009-06-25 22:08:12 +00001096 Old = dyn_cast<FunctionDecl>(OldD);
Reid Spencer5f016e22007-07-11 17:01:13 +00001097 if (!Old) {
John McCall41ce66f2009-12-10 19:51:03 +00001098 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) {
1099 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse);
1100 Diag(Shadow->getTargetDecl()->getLocation(),
1101 diag::note_using_decl_target);
1102 Diag(Shadow->getUsingDecl()->getLocation(),
1103 diag::note_using_decl) << 0;
1104 return true;
1105 }
1106
Chris Lattner5dc266a2008-11-20 06:13:02 +00001107 Diag(New->getLocation(), diag::err_redefinition_different_kind)
Chris Lattner08631c52008-11-23 21:45:46 +00001108 << New->getDeclName();
Chris Lattner5f4a6822008-11-23 23:12:31 +00001109 Diag(OldD->getLocation(), diag::note_previous_definition);
Douglas Gregorcda9c672009-02-16 17:45:42 +00001110 return true;
Reid Spencer5f016e22007-07-11 17:01:13 +00001111 }
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00001112
1113 // Determine whether the previous declaration was a definition,
1114 // implicit declaration, or a declaration.
1115 diag::kind PrevDiag;
1116 if (Old->isThisDeclarationADefinition())
Chris Lattner5f4a6822008-11-23 23:12:31 +00001117 PrevDiag = diag::note_previous_definition;
Douglas Gregorcda9c672009-02-16 17:45:42 +00001118 else if (Old->isImplicit())
1119 PrevDiag = diag::note_previous_implicit_declaration;
Mike Stump1eb44332009-09-09 15:08:12 +00001120 else
Chris Lattner5f4a6822008-11-23 23:12:31 +00001121 PrevDiag = diag::note_previous_declaration;
Mike Stump1eb44332009-09-09 15:08:12 +00001122
Chris Lattner8bcfc5b2008-04-06 23:10:54 +00001123 QualType OldQType = Context.getCanonicalType(Old->getType());
1124 QualType NewQType = Context.getCanonicalType(New->getType());
Mike Stump1eb44332009-09-09 15:08:12 +00001125
Charles Davisf3f8d2a2010-02-18 02:00:42 +00001126 // Don't complain about this if we're in GNU89 mode and the old function
1127 // is an extern inline function.
Douglas Gregor04495c82009-02-24 01:23:02 +00001128 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) &&
John McCalld931b082010-08-26 03:08:43 +00001129 New->getStorageClass() == SC_Static &&
1130 Old->getStorageClass() != SC_Static &&
Charles Davisf3f8d2a2010-02-18 02:00:42 +00001131 !canRedefineFunction(Old, getLangOptions())) {
Douglas Gregor04495c82009-02-24 01:23:02 +00001132 Diag(New->getLocation(), diag::err_static_non_static)
1133 << New;
1134 Diag(Old->getLocation(), PrevDiag);
1135 return true;
1136 }
1137
John McCallf82b4e82010-02-04 05:44:44 +00001138 // If a function is first declared with a calling convention, but is
1139 // later declared or defined without one, the second decl assumes the
1140 // calling convention of the first.
1141 //
1142 // For the new decl, we have to look at the NON-canonical type to tell the
1143 // difference between a function that really doesn't have a calling
1144 // convention and one that is declared cdecl. That's because in
1145 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away
1146 // because it is the default calling convention.
1147 //
1148 // Note also that we DO NOT return at this point, because we still have
1149 // other tests to run.
1150 const FunctionType *OldType = OldQType->getAs<FunctionType>();
1151 const FunctionType *NewType = New->getType()->getAs<FunctionType>();
Rafael Espindola264ba482010-03-30 20:24:48 +00001152 const FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo();
1153 const FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo();
1154 if (OldTypeInfo.getCC() != CC_Default &&
1155 NewTypeInfo.getCC() == CC_Default) {
1156 NewQType = Context.getCallConvType(NewQType, OldTypeInfo.getCC());
John McCallf82b4e82010-02-04 05:44:44 +00001157 New->setType(NewQType);
1158 NewQType = Context.getCanonicalType(NewQType);
Rafael Espindola264ba482010-03-30 20:24:48 +00001159 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(),
1160 NewTypeInfo.getCC())) {
John McCallf82b4e82010-02-04 05:44:44 +00001161 // Calling conventions really aren't compatible, so complain.
John McCall04a67a62010-02-05 21:31:56 +00001162 Diag(New->getLocation(), diag::err_cconv_change)
Rafael Espindola264ba482010-03-30 20:24:48 +00001163 << FunctionType::getNameForCallConv(NewTypeInfo.getCC())
1164 << (OldTypeInfo.getCC() == CC_Default)
1165 << (OldTypeInfo.getCC() == CC_Default ? "" :
1166 FunctionType::getNameForCallConv(OldTypeInfo.getCC()));
John McCall04a67a62010-02-05 21:31:56 +00001167 Diag(Old->getLocation(), diag::note_previous_declaration);
John McCallf82b4e82010-02-04 05:44:44 +00001168 return true;
1169 }
1170
John McCall04a67a62010-02-05 21:31:56 +00001171 // FIXME: diagnose the other way around?
Douglas Gregord2c64902010-06-18 21:30:25 +00001172 if (OldType->getNoReturnAttr() && !NewType->getNoReturnAttr()) {
John McCall04a67a62010-02-05 21:31:56 +00001173 NewQType = Context.getNoReturnType(NewQType);
1174 New->setType(NewQType);
1175 assert(NewQType.isCanonical());
1176 }
1177
Douglas Gregord2c64902010-06-18 21:30:25 +00001178 // Merge regparm attribute.
1179 if (OldType->getRegParmType() != NewType->getRegParmType()) {
1180 if (NewType->getRegParmType()) {
1181 Diag(New->getLocation(), diag::err_regparm_mismatch)
1182 << NewType->getRegParmType()
1183 << OldType->getRegParmType();
1184 Diag(Old->getLocation(), diag::note_previous_declaration);
1185 return true;
1186 }
1187
1188 NewQType = Context.getRegParmType(NewQType, OldType->getRegParmType());
1189 New->setType(NewQType);
1190 assert(NewQType.isCanonical());
1191 }
1192
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00001193 if (getLangOptions().CPlusPlus) {
1194 // (C++98 13.1p2):
1195 // Certain function declarations cannot be overloaded:
Mike Stump1eb44332009-09-09 15:08:12 +00001196 // -- Function declarations that differ only in the return type
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00001197 // cannot be overloaded.
Mike Stump1eb44332009-09-09 15:08:12 +00001198 QualType OldReturnType
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00001199 = cast<FunctionType>(OldQType.getTypePtr())->getResultType();
Mike Stump1eb44332009-09-09 15:08:12 +00001200 QualType NewReturnType
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00001201 = cast<FunctionType>(NewQType.getTypePtr())->getResultType();
Fariborz Jahanian2390a722010-05-19 21:37:30 +00001202 QualType ResQT;
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00001203 if (OldReturnType != NewReturnType) {
Fariborz Jahanian2390a722010-05-19 21:37:30 +00001204 if (NewReturnType->isObjCObjectPointerType()
1205 && OldReturnType->isObjCObjectPointerType())
1206 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType);
1207 if (ResQT.isNull()) {
1208 Diag(New->getLocation(), diag::err_ovl_diff_return_type);
1209 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
1210 return true;
1211 }
1212 else
1213 NewQType = ResQT;
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00001214 }
1215
1216 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old);
John McCall3d043362010-04-13 07:45:41 +00001217 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New);
Anders Carlsson5c478cf2009-12-04 22:33:25 +00001218 if (OldMethod && NewMethod) {
John McCall3d043362010-04-13 07:45:41 +00001219 // Preserve triviality.
1220 NewMethod->setTrivial(OldMethod->isTrivial());
1221
1222 bool isFriend = NewMethod->getFriendObjectKind();
1223
1224 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord()) {
Anders Carlsson5c478cf2009-12-04 22:33:25 +00001225 // -- Member function declarations with the same name and the
1226 // same parameter types cannot be overloaded if any of them
1227 // is a static member function declaration.
1228 if (OldMethod->isStatic() || NewMethod->isStatic()) {
1229 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member);
1230 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
1231 return true;
1232 }
1233
1234 // C++ [class.mem]p1:
1235 // [...] A member shall not be declared twice in the
1236 // member-specification, except that a nested class or member
1237 // class template can be declared and then later defined.
1238 unsigned NewDiag;
1239 if (isa<CXXConstructorDecl>(OldMethod))
1240 NewDiag = diag::err_constructor_redeclared;
1241 else if (isa<CXXDestructorDecl>(NewMethod))
1242 NewDiag = diag::err_destructor_redeclared;
1243 else if (isa<CXXConversionDecl>(NewMethod))
1244 NewDiag = diag::err_conv_function_redeclared;
1245 else
1246 NewDiag = diag::err_member_redeclared;
1247
1248 Diag(New->getLocation(), NewDiag);
Douglas Gregor3e41d602009-02-13 23:20:09 +00001249 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
John McCall3d043362010-04-13 07:45:41 +00001250
1251 // Complain if this is an explicit declaration of a special
1252 // member that was initially declared implicitly.
1253 //
1254 // As an exception, it's okay to befriend such methods in order
1255 // to permit the implicit constructor/destructor/operator calls.
1256 } else if (OldMethod->isImplicit()) {
1257 if (isFriend) {
1258 NewMethod->setImplicit();
1259 } else {
Anders Carlsson5c478cf2009-12-04 22:33:25 +00001260 Diag(NewMethod->getLocation(),
1261 diag::err_definition_of_implicitly_declared_member)
Anders Carlsson3b8c53b2010-04-22 05:40:53 +00001262 << New << getSpecialMember(OldMethod);
Anders Carlsson5c478cf2009-12-04 22:33:25 +00001263 return true;
1264 }
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00001265 }
1266 }
1267
1268 // (C++98 8.3.5p3):
1269 // All declarations for a function shall agree exactly in both the
1270 // return type and the parameter-type-list.
Nuno Lopesf75b8302009-12-23 23:40:33 +00001271 // attributes should be ignored when comparing.
1272 if (Context.getNoReturnType(OldQType, false) ==
1273 Context.getNoReturnType(NewQType, false))
Douglas Gregor04495c82009-02-24 01:23:02 +00001274 return MergeCompatibleFunctionDecls(New, Old);
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00001275
1276 // Fall through for conflicting redeclarations and redefinitions.
Douglas Gregorf0097952008-04-21 02:02:58 +00001277 }
Chris Lattner04421082008-04-08 04:40:51 +00001278
1279 // C: Function types need to be compatible, not identical. This handles
Steve Naroffadbbd0c2008-01-14 20:51:29 +00001280 // duplicate function decls like "void f(int); void f(enum X);" properly.
Chris Lattner04421082008-04-08 04:40:51 +00001281 if (!getLangOptions().CPlusPlus &&
Eli Friedman3d815e72008-08-22 00:56:42 +00001282 Context.typesAreCompatible(OldQType, NewQType)) {
John McCall183700f2009-09-21 23:43:11 +00001283 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>();
1284 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>();
Douglas Gregor72564e72009-02-26 23:50:07 +00001285 const FunctionProtoType *OldProto = 0;
1286 if (isa<FunctionNoProtoType>(NewFuncType) &&
Douglas Gregorc8376562009-03-06 22:43:54 +00001287 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) {
Douglas Gregor68719812009-02-16 18:20:44 +00001288 // The old declaration provided a function prototype, but the
1289 // new declaration does not. Merge in the prototype.
Sebastian Redl465226e2009-05-27 22:11:52 +00001290 assert(!OldProto->hasExceptionSpec() && "Exception spec in C");
Douglas Gregor68719812009-02-16 18:20:44 +00001291 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(),
1292 OldProto->arg_type_end());
1293 NewQType = Context.getFunctionType(NewFuncType->getResultType(),
Jay Foadbeaaccd2009-05-21 09:52:38 +00001294 ParamTypes.data(), ParamTypes.size(),
Douglas Gregor68719812009-02-16 18:20:44 +00001295 OldProto->isVariadic(),
Douglas Gregorce056bc2010-02-21 22:15:06 +00001296 OldProto->getTypeQuals(),
1297 false, false, 0, 0,
Rafael Espindola264ba482010-03-30 20:24:48 +00001298 OldProto->getExtInfo());
Douglas Gregor68719812009-02-16 18:20:44 +00001299 New->setType(NewQType);
Anders Carlssona75e8532009-05-14 21:46:00 +00001300 New->setHasInheritedPrototype();
Douglas Gregor450da982009-02-16 20:58:07 +00001301
1302 // Synthesize a parameter for each argument type.
1303 llvm::SmallVector<ParmVarDecl*, 16> Params;
Mike Stump1eb44332009-09-09 15:08:12 +00001304 for (FunctionProtoType::arg_type_iterator
1305 ParamType = OldProto->arg_type_begin(),
Douglas Gregor450da982009-02-16 20:58:07 +00001306 ParamEnd = OldProto->arg_type_end();
1307 ParamType != ParamEnd; ++ParamType) {
1308 ParmVarDecl *Param = ParmVarDecl::Create(Context, New,
1309 SourceLocation(), 0,
John McCalla93c9342009-12-07 02:54:59 +00001310 *ParamType, /*TInfo=*/0,
John McCalld931b082010-08-26 03:08:43 +00001311 SC_None, SC_None,
Douglas Gregor16573fa2010-04-19 22:54:31 +00001312 0);
Douglas Gregor450da982009-02-16 20:58:07 +00001313 Param->setImplicit();
1314 Params.push_back(Param);
1315 }
1316
Douglas Gregor838db382010-02-11 01:19:42 +00001317 New->setParams(Params.data(), Params.size());
Mike Stump1eb44332009-09-09 15:08:12 +00001318 }
Douglas Gregor68719812009-02-16 18:20:44 +00001319
Douglas Gregor04495c82009-02-24 01:23:02 +00001320 return MergeCompatibleFunctionDecls(New, Old);
Chris Lattner04421082008-04-08 04:40:51 +00001321 }
Chris Lattnere3995fe2007-11-06 06:07:26 +00001322
Douglas Gregorc8376562009-03-06 22:43:54 +00001323 // GNU C permits a K&R definition to follow a prototype declaration
1324 // if the declared types of the parameters in the K&R definition
1325 // match the types in the prototype declaration, even when the
1326 // promoted types of the parameters from the K&R definition differ
1327 // from the types in the prototype. GCC then keeps the types from
1328 // the prototype.
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00001329 //
1330 // If a variadic prototype is followed by a non-variadic K&R definition,
1331 // the K&R definition becomes variadic. This is sort of an edge case, but
1332 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and
1333 // C99 6.9.1p8.
Douglas Gregorc8376562009-03-06 22:43:54 +00001334 if (!getLangOptions().CPlusPlus &&
Douglas Gregorc8376562009-03-06 22:43:54 +00001335 Old->hasPrototype() && !New->hasPrototype() &&
John McCall183700f2009-09-21 23:43:11 +00001336 New->getType()->getAs<FunctionProtoType>() &&
Douglas Gregorc8376562009-03-06 22:43:54 +00001337 Old->getNumParams() == New->getNumParams()) {
1338 llvm::SmallVector<QualType, 16> ArgTypes;
1339 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings;
Mike Stump1eb44332009-09-09 15:08:12 +00001340 const FunctionProtoType *OldProto
John McCall183700f2009-09-21 23:43:11 +00001341 = Old->getType()->getAs<FunctionProtoType>();
Mike Stump1eb44332009-09-09 15:08:12 +00001342 const FunctionProtoType *NewProto
John McCall183700f2009-09-21 23:43:11 +00001343 = New->getType()->getAs<FunctionProtoType>();
Mike Stump1eb44332009-09-09 15:08:12 +00001344
Douglas Gregorc8376562009-03-06 22:43:54 +00001345 // Determine whether this is the GNU C extension.
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00001346 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(),
1347 NewProto->getResultType());
1348 bool LooseCompatible = !MergedReturn.isNull();
Mike Stump1eb44332009-09-09 15:08:12 +00001349 for (unsigned Idx = 0, End = Old->getNumParams();
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00001350 LooseCompatible && Idx != End; ++Idx) {
Douglas Gregorc8376562009-03-06 22:43:54 +00001351 ParmVarDecl *OldParm = Old->getParamDecl(Idx);
1352 ParmVarDecl *NewParm = New->getParamDecl(Idx);
Mike Stump1eb44332009-09-09 15:08:12 +00001353 if (Context.typesAreCompatible(OldParm->getType(),
Douglas Gregorc8376562009-03-06 22:43:54 +00001354 NewProto->getArgType(Idx))) {
1355 ArgTypes.push_back(NewParm->getType());
1356 } else if (Context.typesAreCompatible(OldParm->getType(),
Douglas Gregor447234d2010-07-29 15:18:02 +00001357 NewParm->getType(),
1358 /*CompareUnqualified=*/true)) {
Mike Stump1eb44332009-09-09 15:08:12 +00001359 GNUCompatibleParamWarning Warn
Douglas Gregorc8376562009-03-06 22:43:54 +00001360 = { OldParm, NewParm, NewProto->getArgType(Idx) };
1361 Warnings.push_back(Warn);
1362 ArgTypes.push_back(NewParm->getType());
1363 } else
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00001364 LooseCompatible = false;
Douglas Gregorc8376562009-03-06 22:43:54 +00001365 }
1366
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00001367 if (LooseCompatible) {
Douglas Gregorc8376562009-03-06 22:43:54 +00001368 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) {
1369 Diag(Warnings[Warn].NewParm->getLocation(),
1370 diag::ext_param_promoted_not_compatible_with_prototype)
1371 << Warnings[Warn].PromotedType
1372 << Warnings[Warn].OldParm->getType();
Douglas Gregor447234d2010-07-29 15:18:02 +00001373 if (Warnings[Warn].OldParm->getLocation().isValid())
1374 Diag(Warnings[Warn].OldParm->getLocation(),
1375 diag::note_previous_declaration);
Douglas Gregorc8376562009-03-06 22:43:54 +00001376 }
1377
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00001378 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0],
1379 ArgTypes.size(),
Douglas Gregorce056bc2010-02-21 22:15:06 +00001380 OldProto->isVariadic(), 0,
1381 false, false, 0, 0,
Rafael Espindola264ba482010-03-30 20:24:48 +00001382 OldProto->getExtInfo()));
Douglas Gregorc8376562009-03-06 22:43:54 +00001383 return MergeCompatibleFunctionDecls(New, Old);
1384 }
1385
1386 // Fall through to diagnose conflicting types.
1387 }
1388
Steve Naroff837618c2008-01-16 15:01:34 +00001389 // A function that has already been declared has been redeclared or defined
1390 // with a different type- show appropriate diagnostic
Douglas Gregor7814e6d2009-09-12 00:22:50 +00001391 if (unsigned BuiltinID = Old->getBuiltinID()) {
Douglas Gregorcda9c672009-02-16 17:45:42 +00001392 // The user has declared a builtin function with an incompatible
1393 // signature.
1394 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) {
1395 // The function the user is redeclaring is a library-defined
1396 // function like 'malloc' or 'printf'. Warn about the
Douglas Gregor374e1562009-03-23 17:47:24 +00001397 // redeclaration, then pretend that we don't know about this
1398 // library built-in.
Douglas Gregorcda9c672009-02-16 17:45:42 +00001399 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New;
1400 Diag(Old->getLocation(), diag::note_previous_builtin_declaration)
1401 << Old << Old->getType();
Douglas Gregor374e1562009-03-23 17:47:24 +00001402 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin);
1403 Old->setInvalidDecl();
1404 return false;
Douglas Gregorcda9c672009-02-16 17:45:42 +00001405 }
Steve Naroff837618c2008-01-16 15:01:34 +00001406
Douglas Gregorcda9c672009-02-16 17:45:42 +00001407 PrevDiag = diag::note_previous_builtin_declaration;
1408 }
1409
Chris Lattnerd9d22dd2008-11-24 05:29:24 +00001410 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName();
Douglas Gregor3e41d602009-02-13 23:20:09 +00001411 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
Douglas Gregorcda9c672009-02-16 17:45:42 +00001412 return true;
Reid Spencer5f016e22007-07-11 17:01:13 +00001413}
1414
Douglas Gregor04495c82009-02-24 01:23:02 +00001415/// \brief Completes the merge of two function declarations that are
Mike Stump1eb44332009-09-09 15:08:12 +00001416/// known to be compatible.
Douglas Gregor04495c82009-02-24 01:23:02 +00001417///
1418/// This routine handles the merging of attributes and other
1419/// properties of function declarations form the old declaration to
1420/// the new declaration, once we know that New is in fact a
1421/// redeclaration of Old.
1422///
1423/// \returns false
1424bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) {
1425 // Merge the attributes
Sean Huntcf807c42010-08-18 23:23:40 +00001426 MergeDeclAttributes(New, Old, Context);
Douglas Gregor04495c82009-02-24 01:23:02 +00001427
1428 // Merge the storage class.
John McCalld931b082010-08-26 03:08:43 +00001429 if (Old->getStorageClass() != SC_Extern &&
1430 Old->getStorageClass() != SC_None)
Douglas Gregor9f9bf252009-04-28 06:37:30 +00001431 New->setStorageClass(Old->getStorageClass());
Douglas Gregor04495c82009-02-24 01:23:02 +00001432
Douglas Gregor04495c82009-02-24 01:23:02 +00001433 // Merge "pure" flag.
1434 if (Old->isPure())
1435 New->setPure();
1436
1437 // Merge the "deleted" flag.
1438 if (Old->isDeleted())
1439 New->setDeleted();
Mike Stump1eb44332009-09-09 15:08:12 +00001440
Douglas Gregor04495c82009-02-24 01:23:02 +00001441 if (getLangOptions().CPlusPlus)
1442 return MergeCXXFunctionDecl(New, Old);
1443
1444 return false;
1445}
1446
Reid Spencer5f016e22007-07-11 17:01:13 +00001447/// MergeVarDecl - We just parsed a variable 'New' which has the same name
1448/// and scope as a previous declaration 'Old'. Figure out how to resolve this
1449/// situation, merging decls or emitting diagnostics as appropriate.
1450///
Mike Stump1eb44332009-09-09 15:08:12 +00001451/// Tentative definition rules (C99 6.9.2p2) are checked by
1452/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative
Steve Naroffff9eb1f2008-08-08 17:50:35 +00001453/// definitions here, since the initializer hasn't been attached.
Mike Stump1eb44332009-09-09 15:08:12 +00001454///
John McCall68263142009-11-18 22:49:29 +00001455void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) {
1456 // If the new decl is already invalid, don't do any other checking.
1457 if (New->isInvalidDecl())
1458 return;
Mike Stump1eb44332009-09-09 15:08:12 +00001459
Reid Spencer5f016e22007-07-11 17:01:13 +00001460 // Verify the old decl was also a variable.
John McCall68263142009-11-18 22:49:29 +00001461 VarDecl *Old = 0;
1462 if (!Previous.isSingleResult() ||
1463 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) {
Chris Lattnerf3a41af2008-11-20 06:38:18 +00001464 Diag(New->getLocation(), diag::err_redefinition_different_kind)
Chris Lattner08631c52008-11-23 21:45:46 +00001465 << New->getDeclName();
John McCall68263142009-11-18 22:49:29 +00001466 Diag(Previous.getRepresentativeDecl()->getLocation(),
1467 diag::note_previous_definition);
Chris Lattnereaaebc72009-04-25 08:06:05 +00001468 return New->setInvalidDecl();
Reid Spencer5f016e22007-07-11 17:01:13 +00001469 }
Chris Lattnerddee4232008-03-03 03:28:21 +00001470
Douglas Gregor7f6ff022010-08-30 14:32:14 +00001471 // C++ [class.mem]p1:
1472 // A member shall not be declared twice in the member-specification [...]
1473 //
1474 // Here, we need only consider static data members.
1475 if (Old->isStaticDataMember() && !New->isOutOfLine()) {
1476 Diag(New->getLocation(), diag::err_duplicate_member)
1477 << New->getIdentifier();
1478 Diag(Old->getLocation(), diag::note_previous_declaration);
1479 New->setInvalidDecl();
1480 }
1481
Sean Huntcf807c42010-08-18 23:23:40 +00001482 MergeDeclAttributes(New, Old, Context);
Chris Lattnerddee4232008-03-03 03:28:21 +00001483
Eli Friedman13ca96a2009-01-24 23:49:55 +00001484 // Merge the types
Eli Friedman88d936b2009-05-16 13:54:38 +00001485 QualType MergedT;
1486 if (getLangOptions().CPlusPlus) {
1487 if (Context.hasSameType(New->getType(), Old->getType()))
1488 MergedT = New->getType();
Eli Friedman153c33e2009-12-10 08:54:47 +00001489 // C++ [basic.link]p10:
1490 // [...] the types specified by all declarations referring to a given
1491 // object or function shall be identical, except that declarations for an
1492 // array object can specify array types that differ by the presence or
1493 // absence of a major array bound (8.3.4).
Mike Stump1eb44332009-09-09 15:08:12 +00001494 else if (Old->getType()->isIncompleteArrayType() &&
Douglas Gregor8dfb7ec2009-09-09 06:04:29 +00001495 New->getType()->isArrayType()) {
Mike Stump1eb44332009-09-09 15:08:12 +00001496 CanQual<ArrayType> OldArray
Douglas Gregor8dfb7ec2009-09-09 06:04:29 +00001497 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>();
Mike Stump1eb44332009-09-09 15:08:12 +00001498 CanQual<ArrayType> NewArray
Douglas Gregor8dfb7ec2009-09-09 06:04:29 +00001499 = Context.getCanonicalType(New->getType())->getAs<ArrayType>();
1500 if (OldArray->getElementType() == NewArray->getElementType())
1501 MergedT = New->getType();
Eli Friedman153c33e2009-12-10 08:54:47 +00001502 } else if (Old->getType()->isArrayType() &&
1503 New->getType()->isIncompleteArrayType()) {
1504 CanQual<ArrayType> OldArray
1505 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>();
1506 CanQual<ArrayType> NewArray
1507 = Context.getCanonicalType(New->getType())->getAs<ArrayType>();
1508 if (OldArray->getElementType() == NewArray->getElementType())
1509 MergedT = Old->getType();
Fariborz Jahanian2390a722010-05-19 21:37:30 +00001510 } else if (New->getType()->isObjCObjectPointerType()
1511 && Old->getType()->isObjCObjectPointerType()) {
1512 MergedT = Context.mergeObjCGCQualifiers(New->getType(), Old->getType());
Douglas Gregor8dfb7ec2009-09-09 06:04:29 +00001513 }
Eli Friedman88d936b2009-05-16 13:54:38 +00001514 } else {
1515 MergedT = Context.mergeTypes(New->getType(), Old->getType());
1516 }
Eli Friedman13ca96a2009-01-24 23:49:55 +00001517 if (MergedT.isNull()) {
Mike Stump1eb44332009-09-09 15:08:12 +00001518 Diag(New->getLocation(), diag::err_redefinition_different_type)
Douglas Gregor6037fcb2009-01-09 19:42:16 +00001519 << New->getDeclName();
Chris Lattner5f4a6822008-11-23 23:12:31 +00001520 Diag(Old->getLocation(), diag::note_previous_definition);
Chris Lattnereaaebc72009-04-25 08:06:05 +00001521 return New->setInvalidDecl();
Reid Spencer5f016e22007-07-11 17:01:13 +00001522 }
Eli Friedman13ca96a2009-01-24 23:49:55 +00001523 New->setType(MergedT);
Douglas Gregor656de632009-03-11 23:52:16 +00001524
Steve Naroffb7b032e2008-01-30 00:44:01 +00001525 // C99 6.2.2p4: Check if we have a static decl followed by a non-static.
John McCalld931b082010-08-26 03:08:43 +00001526 if (New->getStorageClass() == SC_Static &&
1527 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) {
Chris Lattnerd9d22dd2008-11-24 05:29:24 +00001528 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName();
Chris Lattner5f4a6822008-11-23 23:12:31 +00001529 Diag(Old->getLocation(), diag::note_previous_definition);
Chris Lattnereaaebc72009-04-25 08:06:05 +00001530 return New->setInvalidDecl();
Steve Naroffb7b032e2008-01-30 00:44:01 +00001531 }
Mike Stump1eb44332009-09-09 15:08:12 +00001532 // C99 6.2.2p4:
Douglas Gregor5ef122e2009-03-19 22:01:50 +00001533 // For an identifier declared with the storage-class specifier
1534 // extern in a scope in which a prior declaration of that
1535 // identifier is visible,23) if the prior declaration specifies
1536 // internal or external linkage, the linkage of the identifier at
1537 // the later declaration is the same as the linkage specified at
1538 // the prior declaration. If no prior declaration is visible, or
1539 // if the prior declaration specifies no linkage, then the
1540 // identifier has external linkage.
Douglas Gregor38179b22009-03-23 16:17:01 +00001541 if (New->hasExternalStorage() && Old->hasLinkage())
Douglas Gregor5ef122e2009-03-19 22:01:50 +00001542 /* Okay */;
John McCalld931b082010-08-26 03:08:43 +00001543 else if (New->getStorageClass() != SC_Static &&
1544 Old->getStorageClass() == SC_Static) {
Chris Lattnerd9d22dd2008-11-24 05:29:24 +00001545 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName();
Chris Lattner5f4a6822008-11-23 23:12:31 +00001546 Diag(Old->getLocation(), diag::note_previous_definition);
Chris Lattnereaaebc72009-04-25 08:06:05 +00001547 return New->setInvalidDecl();
Steve Naroffb7b032e2008-01-30 00:44:01 +00001548 }
Daniel Dunbar5466c7b2009-04-14 02:25:56 +00001549
Steve Naroff094cefb2008-09-17 14:05:40 +00001550 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup.
Mike Stump1eb44332009-09-09 15:08:12 +00001551
Daniel Dunbar5466c7b2009-04-14 02:25:56 +00001552 // FIXME: The test for external storage here seems wrong? We still
1553 // need to check for mismatches.
1554 if (!New->hasExternalStorage() && !New->isFileVarDecl() &&
Douglas Gregor656de632009-03-11 23:52:16 +00001555 // Don't complain about out-of-line definitions of static members.
1556 !(Old->getLexicalDeclContext()->isRecord() &&
1557 !New->getLexicalDeclContext()->isRecord())) {
Chris Lattner08631c52008-11-23 21:45:46 +00001558 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName();
Chris Lattner5f4a6822008-11-23 23:12:31 +00001559 Diag(Old->getLocation(), diag::note_previous_definition);
Chris Lattnereaaebc72009-04-25 08:06:05 +00001560 return New->setInvalidDecl();
Reid Spencer5f016e22007-07-11 17:01:13 +00001561 }
Douglas Gregor275a3692009-03-10 23:43:53 +00001562
Eli Friedman63054b32009-04-19 20:27:55 +00001563 if (New->isThreadSpecified() && !Old->isThreadSpecified()) {
1564 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName();
1565 Diag(Old->getLocation(), diag::note_previous_definition);
1566 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) {
1567 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName();
1568 Diag(Old->getLocation(), diag::note_previous_definition);
1569 }
1570
Sebastian Redl4cae1b32010-02-02 18:35:11 +00001571 // C++ doesn't have tentative definitions, so go right ahead and check here.
1572 const VarDecl *Def;
Sebastian Redl6c048a92010-02-03 02:08:48 +00001573 if (getLangOptions().CPlusPlus &&
1574 New->isThisDeclarationADefinition() == VarDecl::Definition &&
Sebastian Redl4cae1b32010-02-02 18:35:11 +00001575 (Def = Old->getDefinition())) {
1576 Diag(New->getLocation(), diag::err_redefinition)
1577 << New->getDeclName();
1578 Diag(Def->getLocation(), diag::note_previous_definition);
1579 New->setInvalidDecl();
1580 return;
1581 }
Fariborz Jahanianfba9e8f2010-06-25 00:05:45 +00001582 // c99 6.2.2 P4.
1583 // For an identifier declared with the storage-class specifier extern in a
1584 // scope in which a prior declaration of that identifier is visible, if
1585 // the prior declaration specifies internal or external linkage, the linkage
1586 // of the identifier at the later declaration is the same as the linkage
1587 // specified at the prior declaration.
1588 // FIXME. revisit this code.
Fariborz Jahanian2bf6d7b2010-06-21 16:08:37 +00001589 if (New->hasExternalStorage() &&
Fariborz Jahanian7d99e982010-06-24 18:50:41 +00001590 Old->getLinkage() == InternalLinkage &&
1591 New->getDeclContext() == Old->getDeclContext())
Fariborz Jahanian2bf6d7b2010-06-21 16:08:37 +00001592 New->setStorageClass(Old->getStorageClass());
1593
Douglas Gregor275a3692009-03-10 23:43:53 +00001594 // Keep a chain of previous declarations.
1595 New->setPreviousDeclaration(Old);
John McCall46460a62010-01-20 21:53:11 +00001596
1597 // Inherit access appropriately.
1598 New->setAccess(Old->getAccess());
Reid Spencer5f016e22007-07-11 17:01:13 +00001599}
1600
1601/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with
1602/// no declarator (e.g. "struct foo;") is parsed.
John McCalld226f652010-08-21 09:40:31 +00001603Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS,
1604 DeclSpec &DS) {
Eli Friedmand2968362009-04-09 21:26:42 +00001605 // FIXME: Error on auto/register at file scope
1606 // FIXME: Error on inline/virtual/explicit
Eli Friedman63054b32009-04-19 20:27:55 +00001607 // FIXME: Warn on useless __thread
Eli Friedmand2968362009-04-09 21:26:42 +00001608 // FIXME: Warn on useless const/volatile
1609 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable
1610 // FIXME: Warn on useless attributes
John McCalle3af0232009-10-07 23:34:25 +00001611 Decl *TagD = 0;
Douglas Gregor1a51b4a2009-02-09 15:09:02 +00001612 TagDecl *Tag = 0;
1613 if (DS.getTypeSpecType() == DeclSpec::TST_class ||
1614 DS.getTypeSpecType() == DeclSpec::TST_struct ||
1615 DS.getTypeSpecType() == DeclSpec::TST_union ||
Douglas Gregor4d9a16f2009-05-12 23:25:50 +00001616 DS.getTypeSpecType() == DeclSpec::TST_enum) {
John McCallb3d87482010-08-24 05:47:05 +00001617 TagD = DS.getRepAsDecl();
John McCalle3af0232009-10-07 23:34:25 +00001618
1619 if (!TagD) // We probably had an error
John McCalld226f652010-08-21 09:40:31 +00001620 return 0;
Douglas Gregor4d9a16f2009-05-12 23:25:50 +00001621
John McCall67d1a672009-08-06 02:15:43 +00001622 // Note that the above type specs guarantee that the
1623 // type rep is a Decl, whereas in many of the others
1624 // it's a Type.
John McCalle3af0232009-10-07 23:34:25 +00001625 Tag = dyn_cast<TagDecl>(TagD);
Douglas Gregor4d9a16f2009-05-12 23:25:50 +00001626 }
Douglas Gregor1a51b4a2009-02-09 15:09:02 +00001627
Nuno Lopes0a8bab02009-12-17 11:35:26 +00001628 if (unsigned TypeQuals = DS.getTypeQualifiers()) {
1629 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object
1630 // or incomplete types shall not be restrict-qualified."
1631 if (TypeQuals & DeclSpec::TQ_restrict)
1632 Diag(DS.getRestrictSpecLoc(),
1633 diag::err_typecheck_invalid_restrict_not_pointer_noarg)
1634 << DS.getSourceRange();
1635 }
1636
Douglas Gregord85bea22009-09-26 06:47:28 +00001637 if (DS.isFriendSpecified()) {
John McCalle3af0232009-10-07 23:34:25 +00001638 // If we're dealing with a class template decl, assume that the
1639 // template routines are handling it.
1640 if (TagD && isa<ClassTemplateDecl>(TagD))
John McCalld226f652010-08-21 09:40:31 +00001641 return 0;
John McCalle3af0232009-10-07 23:34:25 +00001642 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0));
Douglas Gregord85bea22009-09-26 06:47:28 +00001643 }
1644
Douglas Gregor4920f1f2009-01-12 22:49:06 +00001645 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) {
Sean Huntcf807c42010-08-18 23:23:40 +00001646 ProcessDeclAttributeList(S, Record, DS.getAttributes());
Chris Lattnerd451f832009-10-25 22:21:57 +00001647
Douglas Gregor4920f1f2009-01-12 22:49:06 +00001648 if (!Record->getDeclName() && Record->isDefinition() &&
Douglas Gregora71c1292009-03-06 23:06:59 +00001649 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) {
1650 if (getLangOptions().CPlusPlus ||
1651 Record->getDeclContext()->isRecord())
John McCallaec03712010-05-21 20:45:30 +00001652 return BuildAnonymousStructOrUnion(S, DS, AS, Record);
Douglas Gregora71c1292009-03-06 23:06:59 +00001653
Douglas Gregorcb821d02010-04-08 21:33:23 +00001654 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators)
Douglas Gregora71c1292009-03-06 23:06:59 +00001655 << DS.getSourceRange();
1656 }
Douglas Gregor4920f1f2009-01-12 22:49:06 +00001657
1658 // Microsoft allows unnamed struct/union fields. Don't complain
1659 // about them.
1660 // FIXME: Should we support Microsoft's extensions in this area?
1661 if (Record->getDeclName() && getLangOptions().Microsoft)
John McCalld226f652010-08-21 09:40:31 +00001662 return Tag;
Douglas Gregor4920f1f2009-01-12 22:49:06 +00001663 }
Douglas Gregord85bea22009-09-26 06:47:28 +00001664
Douglas Gregora131d0f2010-07-13 06:24:26 +00001665 if (getLangOptions().CPlusPlus &&
1666 DS.getStorageClassSpec() != DeclSpec::SCS_typedef)
1667 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag))
1668 if (Enum->enumerator_begin() == Enum->enumerator_end() &&
1669 !Enum->getIdentifier() && !Enum->isInvalidDecl())
1670 Diag(Enum->getLocation(), diag::ext_no_declarators)
1671 << DS.getSourceRange();
1672
Mike Stump1eb44332009-09-09 15:08:12 +00001673 if (!DS.isMissingDeclaratorOk() &&
Douglas Gregorddc29e12009-02-06 22:42:48 +00001674 DS.getTypeSpecType() != DeclSpec::TST_error) {
Douglas Gregor21282df2009-01-22 16:23:54 +00001675 // Warn about typedefs of enums without names, since this is an
Douglas Gregora0ebd602010-07-16 15:40:40 +00001676 // extension in both Microsoft and GNU.
Douglas Gregor8158f692009-01-17 02:55:50 +00001677 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef &&
1678 Tag && isa<EnumDecl>(Tag)) {
Douglas Gregora0ebd602010-07-16 15:40:40 +00001679 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name)
1680 << DS.getSourceRange();
John McCalld226f652010-08-21 09:40:31 +00001681 return Tag;
Douglas Gregoree159c12009-01-13 23:10:51 +00001682 }
1683
Douglas Gregorcb821d02010-04-08 21:33:23 +00001684 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators)
Sebastian Redla4ed0d82008-12-28 15:28:59 +00001685 << DS.getSourceRange();
Sebastian Redla4ed0d82008-12-28 15:28:59 +00001686 }
Mike Stump1eb44332009-09-09 15:08:12 +00001687
John McCalld226f652010-08-21 09:40:31 +00001688 return TagD;
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001689}
1690
John McCall1d7c5282009-12-18 10:40:03 +00001691/// We are trying to inject an anonymous member into the given scope;
John McCall68263142009-11-18 22:49:29 +00001692/// check if there's an existing declaration that can't be overloaded.
1693///
1694/// \return true if this is a forbidden redeclaration
John McCall1d7c5282009-12-18 10:40:03 +00001695static bool CheckAnonMemberRedeclaration(Sema &SemaRef,
1696 Scope *S,
Fariborz Jahanian588a4ad2010-01-22 18:30:17 +00001697 DeclContext *Owner,
John McCall1d7c5282009-12-18 10:40:03 +00001698 DeclarationName Name,
1699 SourceLocation NameLoc,
1700 unsigned diagnostic) {
1701 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName,
1702 Sema::ForRedeclaration);
1703 if (!SemaRef.LookupName(R, S)) return false;
John McCall68263142009-11-18 22:49:29 +00001704
John McCall1d7c5282009-12-18 10:40:03 +00001705 if (R.getAsSingle<TagDecl>())
John McCall68263142009-11-18 22:49:29 +00001706 return false;
1707
1708 // Pick a representative declaration.
John McCall1d7c5282009-12-18 10:40:03 +00001709 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl();
Fariborz Jahanian588a4ad2010-01-22 18:30:17 +00001710 if (PrevDecl && Owner->isRecord()) {
1711 RecordDecl *Record = cast<RecordDecl>(Owner);
1712 if (!SemaRef.isDeclInScope(PrevDecl, Record, S))
1713 return false;
1714 }
John McCall68263142009-11-18 22:49:29 +00001715
John McCall1d7c5282009-12-18 10:40:03 +00001716 SemaRef.Diag(NameLoc, diagnostic) << Name;
1717 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
John McCall68263142009-11-18 22:49:29 +00001718
1719 return true;
1720}
1721
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001722/// InjectAnonymousStructOrUnionMembers - Inject the members of the
1723/// anonymous struct or union AnonRecord into the owning context Owner
1724/// and scope S. This routine will be invoked just after we realize
1725/// that an unnamed union or struct is actually an anonymous union or
1726/// struct, e.g.,
1727///
1728/// @code
1729/// union {
1730/// int i;
1731/// float f;
1732/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and
1733/// // f into the surrounding scope.x
1734/// @endcode
1735///
1736/// This routine is recursive, injecting the names of nested anonymous
1737/// structs/unions into the owning context and scope as well.
John McCallaec03712010-05-21 20:45:30 +00001738static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S,
1739 DeclContext *Owner,
1740 RecordDecl *AnonRecord,
1741 AccessSpecifier AS) {
John McCall68263142009-11-18 22:49:29 +00001742 unsigned diagKind
1743 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl
1744 : diag::err_anonymous_struct_member_redecl;
1745
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001746 bool Invalid = false;
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00001747 for (RecordDecl::field_iterator F = AnonRecord->field_begin(),
1748 FEnd = AnonRecord->field_end();
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001749 F != FEnd; ++F) {
1750 if ((*F)->getDeclName()) {
John McCallaec03712010-05-21 20:45:30 +00001751 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, (*F)->getDeclName(),
John McCall1d7c5282009-12-18 10:40:03 +00001752 (*F)->getLocation(), diagKind)) {
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001753 // C++ [class.union]p2:
1754 // The names of the members of an anonymous union shall be
1755 // distinct from the names of any other entity in the
1756 // scope in which the anonymous union is declared.
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001757 Invalid = true;
1758 } else {
1759 // C++ [class.union]p2:
1760 // For the purpose of name lookup, after the anonymous union
1761 // definition, the members of the anonymous union are
1762 // considered to have been defined in the scope in which the
1763 // anonymous union is declared.
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00001764 Owner->makeDeclVisibleInContext(*F);
John McCalld226f652010-08-21 09:40:31 +00001765 S->AddDecl(*F);
John McCallaec03712010-05-21 20:45:30 +00001766 SemaRef.IdResolver.AddDecl(*F);
1767
1768 // That includes picking up the appropriate access specifier.
1769 if (AS != AS_none) (*F)->setAccess(AS);
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001770 }
1771 } else if (const RecordType *InnerRecordType
Ted Kremenek6217b802009-07-29 21:53:49 +00001772 = (*F)->getType()->getAs<RecordType>()) {
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001773 RecordDecl *InnerRecord = InnerRecordType->getDecl();
1774 if (InnerRecord->isAnonymousStructOrUnion())
Mike Stump1eb44332009-09-09 15:08:12 +00001775 Invalid = Invalid ||
John McCallaec03712010-05-21 20:45:30 +00001776 InjectAnonymousStructOrUnionMembers(SemaRef, S, Owner,
1777 InnerRecord, AS);
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001778 }
1779 }
1780
1781 return Invalid;
1782}
1783
Douglas Gregor16573fa2010-04-19 22:54:31 +00001784/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to
1785/// a VarDecl::StorageClass. Any error reporting is up to the caller:
John McCalld931b082010-08-26 03:08:43 +00001786/// illegal input values are mapped to SC_None.
1787static StorageClass
Abramo Bagnara35f9a192010-07-30 16:47:02 +00001788StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) {
Douglas Gregor16573fa2010-04-19 22:54:31 +00001789 switch (StorageClassSpec) {
John McCalld931b082010-08-26 03:08:43 +00001790 case DeclSpec::SCS_unspecified: return SC_None;
1791 case DeclSpec::SCS_extern: return SC_Extern;
1792 case DeclSpec::SCS_static: return SC_Static;
1793 case DeclSpec::SCS_auto: return SC_Auto;
1794 case DeclSpec::SCS_register: return SC_Register;
1795 case DeclSpec::SCS_private_extern: return SC_PrivateExtern;
Douglas Gregor16573fa2010-04-19 22:54:31 +00001796 // Illegal SCSs map to None: error reporting is up to the caller.
1797 case DeclSpec::SCS_mutable: // Fall through.
John McCalld931b082010-08-26 03:08:43 +00001798 case DeclSpec::SCS_typedef: return SC_None;
Douglas Gregor16573fa2010-04-19 22:54:31 +00001799 }
1800 llvm_unreachable("unknown storage class specifier");
1801}
1802
1803/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to
John McCalld931b082010-08-26 03:08:43 +00001804/// a StorageClass. Any error reporting is up to the caller:
1805/// illegal input values are mapped to SC_None.
1806static StorageClass
Abramo Bagnara35f9a192010-07-30 16:47:02 +00001807StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) {
Douglas Gregor16573fa2010-04-19 22:54:31 +00001808 switch (StorageClassSpec) {
John McCalld931b082010-08-26 03:08:43 +00001809 case DeclSpec::SCS_unspecified: return SC_None;
1810 case DeclSpec::SCS_extern: return SC_Extern;
1811 case DeclSpec::SCS_static: return SC_Static;
1812 case DeclSpec::SCS_private_extern: return SC_PrivateExtern;
Douglas Gregor16573fa2010-04-19 22:54:31 +00001813 // Illegal SCSs map to None: error reporting is up to the caller.
1814 case DeclSpec::SCS_auto: // Fall through.
1815 case DeclSpec::SCS_mutable: // Fall through.
1816 case DeclSpec::SCS_register: // Fall through.
John McCalld931b082010-08-26 03:08:43 +00001817 case DeclSpec::SCS_typedef: return SC_None;
Douglas Gregor16573fa2010-04-19 22:54:31 +00001818 }
1819 llvm_unreachable("unknown storage class specifier");
1820}
1821
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001822/// ActOnAnonymousStructOrUnion - Handle the declaration of an
1823/// anonymous structure or union. Anonymous unions are a C++ feature
1824/// (C++ [class.union]) and a GNU C extension; anonymous structures
Mike Stump1eb44332009-09-09 15:08:12 +00001825/// are a GNU C and GNU C++ extension.
John McCalld226f652010-08-21 09:40:31 +00001826Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS,
1827 AccessSpecifier AS,
1828 RecordDecl *Record) {
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001829 DeclContext *Owner = Record->getDeclContext();
1830
1831 // Diagnose whether this anonymous struct/union is an extension.
1832 if (Record->isUnion() && !getLangOptions().CPlusPlus)
1833 Diag(Record->getLocation(), diag::ext_anonymous_union);
1834 else if (!Record->isUnion())
1835 Diag(Record->getLocation(), diag::ext_anonymous_struct);
Mike Stump1eb44332009-09-09 15:08:12 +00001836
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001837 // C and C++ require different kinds of checks for anonymous
1838 // structs/unions.
1839 bool Invalid = false;
1840 if (getLangOptions().CPlusPlus) {
1841 const char* PrevSpec = 0;
John McCallfec54012009-08-03 20:12:06 +00001842 unsigned DiagID;
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001843 // C++ [class.union]p3:
1844 // Anonymous unions declared in a named namespace or in the
1845 // global namespace shall be declared static.
1846 if (DS.getStorageClassSpec() != DeclSpec::SCS_static &&
1847 (isa<TranslationUnitDecl>(Owner) ||
Mike Stump1eb44332009-09-09 15:08:12 +00001848 (isa<NamespaceDecl>(Owner) &&
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001849 cast<NamespaceDecl>(Owner)->getDeclName()))) {
1850 Diag(Record->getLocation(), diag::err_anonymous_union_not_static);
1851 Invalid = true;
1852
1853 // Recover by adding 'static'.
John McCallfec54012009-08-03 20:12:06 +00001854 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(),
1855 PrevSpec, DiagID);
Mike Stump1eb44332009-09-09 15:08:12 +00001856 }
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001857 // C++ [class.union]p3:
1858 // A storage class is not allowed in a declaration of an
1859 // anonymous union in a class scope.
1860 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified &&
1861 isa<RecordDecl>(Owner)) {
Mike Stump1eb44332009-09-09 15:08:12 +00001862 Diag(DS.getStorageClassSpecLoc(),
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001863 diag::err_anonymous_union_with_storage_spec);
1864 Invalid = true;
1865
1866 // Recover by removing the storage specifier.
1867 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(),
John McCallfec54012009-08-03 20:12:06 +00001868 PrevSpec, DiagID);
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001869 }
Douglas Gregor6b3945f2009-01-07 19:46:03 +00001870
Mike Stump1eb44332009-09-09 15:08:12 +00001871 // C++ [class.union]p2:
Douglas Gregor6b3945f2009-01-07 19:46:03 +00001872 // The member-specification of an anonymous union shall only
1873 // define non-static data members. [Note: nested types and
1874 // functions cannot be declared within an anonymous union. ]
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00001875 for (DeclContext::decl_iterator Mem = Record->decls_begin(),
1876 MemEnd = Record->decls_end();
Douglas Gregor6b3945f2009-01-07 19:46:03 +00001877 Mem != MemEnd; ++Mem) {
1878 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) {
1879 // C++ [class.union]p3:
1880 // An anonymous union shall not have private or protected
1881 // members (clause 11).
John McCallaec03712010-05-21 20:45:30 +00001882 assert(FD->getAccess() != AS_none);
1883 if (FD->getAccess() != AS_public) {
Douglas Gregor6b3945f2009-01-07 19:46:03 +00001884 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member)
1885 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected);
1886 Invalid = true;
1887 }
Argyrios Kyrtzidisdd7744d2010-08-16 17:27:08 +00001888
1889 if (CheckNontrivialField(FD))
1890 Invalid = true;
Douglas Gregor6b3945f2009-01-07 19:46:03 +00001891 } else if ((*Mem)->isImplicit()) {
1892 // Any implicit members are fine.
Douglas Gregor1931b442009-02-03 00:34:39 +00001893 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) {
1894 // This is a type that showed up in an
1895 // elaborated-type-specifier inside the anonymous struct or
1896 // union, but which actually declares a type outside of the
1897 // anonymous struct or union. It's okay.
Douglas Gregor6b3945f2009-01-07 19:46:03 +00001898 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) {
1899 if (!MemRecord->isAnonymousStructOrUnion() &&
1900 MemRecord->getDeclName()) {
1901 // This is a nested type declaration.
1902 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type)
1903 << (int)Record->isUnion();
1904 Invalid = true;
1905 }
Abramo Bagnara6206d532010-06-05 05:09:32 +00001906 } else if (isa<AccessSpecDecl>(*Mem)) {
1907 // Any access specifier is fine.
Douglas Gregor6b3945f2009-01-07 19:46:03 +00001908 } else {
1909 // We have something that isn't a non-static data
1910 // member. Complain about it.
1911 unsigned DK = diag::err_anonymous_record_bad_member;
1912 if (isa<TypeDecl>(*Mem))
1913 DK = diag::err_anonymous_record_with_type;
1914 else if (isa<FunctionDecl>(*Mem))
1915 DK = diag::err_anonymous_record_with_function;
1916 else if (isa<VarDecl>(*Mem))
1917 DK = diag::err_anonymous_record_with_static;
1918 Diag((*Mem)->getLocation(), DK)
1919 << (int)Record->isUnion();
1920 Invalid = true;
1921 }
1922 }
Mike Stump1eb44332009-09-09 15:08:12 +00001923 }
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001924
1925 if (!Record->isUnion() && !Owner->isRecord()) {
Douglas Gregor4920f1f2009-01-12 22:49:06 +00001926 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member)
1927 << (int)getLangOptions().CPlusPlus;
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001928 Invalid = true;
1929 }
1930
John McCalleb692e02009-10-22 23:31:08 +00001931 // Mock up a declarator.
1932 Declarator Dc(DS, Declarator::TypeNameContext);
John McCallbf1a0282010-06-04 23:28:52 +00001933 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S);
John McCalla93c9342009-12-07 02:54:59 +00001934 assert(TInfo && "couldn't build declarator info for anonymous struct/union");
John McCalleb692e02009-10-22 23:31:08 +00001935
Mike Stump1eb44332009-09-09 15:08:12 +00001936 // Create a declaration for this anonymous struct/union.
Douglas Gregor4afa39d2009-01-20 01:17:11 +00001937 NamedDecl *Anon = 0;
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001938 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) {
1939 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(),
Mike Stump1eb44332009-09-09 15:08:12 +00001940 /*IdentifierInfo=*/0,
Argyrios Kyrtzidisa5d82002009-08-21 00:31:54 +00001941 Context.getTypeDeclType(Record),
John McCalla93c9342009-12-07 02:54:59 +00001942 TInfo,
Argyrios Kyrtzidisa5d82002009-08-21 00:31:54 +00001943 /*BitWidth=*/0, /*Mutable=*/false);
John McCallaec03712010-05-21 20:45:30 +00001944 Anon->setAccess(AS);
Douglas Gregorfe60f842010-05-03 15:18:25 +00001945 if (getLangOptions().CPlusPlus) {
Douglas Gregor6b3945f2009-01-07 19:46:03 +00001946 FieldCollector->Add(cast<FieldDecl>(Anon));
Douglas Gregorfe60f842010-05-03 15:18:25 +00001947 if (!cast<CXXRecordDecl>(Record)->isEmpty())
1948 cast<CXXRecordDecl>(OwningClass)->setEmpty(false);
1949 }
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001950 } else {
Douglas Gregor16573fa2010-04-19 22:54:31 +00001951 DeclSpec::SCS SCSpec = DS.getStorageClassSpec();
1952 assert(SCSpec != DeclSpec::SCS_typedef &&
1953 "Parser allowed 'typedef' as storage class VarDecl.");
Abramo Bagnara35f9a192010-07-30 16:47:02 +00001954 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec);
Douglas Gregor16573fa2010-04-19 22:54:31 +00001955 if (SCSpec == DeclSpec::SCS_mutable) {
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001956 // mutable can only appear on non-static class members, so it's always
1957 // an error here
1958 Diag(Record->getLocation(), diag::err_mutable_nonmember);
1959 Invalid = true;
John McCalld931b082010-08-26 03:08:43 +00001960 SC = SC_None;
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001961 }
Douglas Gregor16573fa2010-04-19 22:54:31 +00001962 SCSpec = DS.getStorageClassSpecAsWritten();
1963 VarDecl::StorageClass SCAsWritten
Abramo Bagnara35f9a192010-07-30 16:47:02 +00001964 = StorageClassSpecToVarDeclStorageClass(SCSpec);
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001965
1966 Anon = VarDecl::Create(Context, Owner, Record->getLocation(),
Mike Stump1eb44332009-09-09 15:08:12 +00001967 /*IdentifierInfo=*/0,
Argyrios Kyrtzidisa5d82002009-08-21 00:31:54 +00001968 Context.getTypeDeclType(Record),
Douglas Gregor16573fa2010-04-19 22:54:31 +00001969 TInfo, SC, SCAsWritten);
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001970 }
Douglas Gregor6b3945f2009-01-07 19:46:03 +00001971 Anon->setImplicit();
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001972
1973 // Add the anonymous struct/union object to the current
1974 // context. We'll be referencing this object when we refer to one of
1975 // its members.
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00001976 Owner->addDecl(Anon);
Douglas Gregorfe60f842010-05-03 15:18:25 +00001977
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001978 // Inject the members of the anonymous struct/union into the owning
1979 // context and into the identifier resolver chain for name lookup
1980 // purposes.
John McCallaec03712010-05-21 20:45:30 +00001981 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS))
Douglas Gregor4920f1f2009-01-12 22:49:06 +00001982 Invalid = true;
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001983
1984 // Mark this as an anonymous struct/union type. Note that we do not
1985 // do this until after we have already checked and injected the
1986 // members of this anonymous struct/union type, because otherwise
1987 // the members could be injected twice: once by DeclContext when it
1988 // builds its lookup table, and once by
Mike Stump1eb44332009-09-09 15:08:12 +00001989 // InjectAnonymousStructOrUnionMembers.
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001990 Record->setAnonymousStructOrUnion(true);
1991
1992 if (Invalid)
1993 Anon->setInvalidDecl();
1994
John McCalld226f652010-08-21 09:40:31 +00001995 return Anon;
Reid Spencer5f016e22007-07-11 17:01:13 +00001996}
1997
Steve Narofff0090632007-09-02 02:04:30 +00001998
Douglas Gregor10bd3682008-11-17 22:58:34 +00001999/// GetNameForDeclarator - Determine the full declaration name for the
2000/// given Declarator.
Abramo Bagnara25777432010-08-11 22:01:17 +00002001DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) {
Douglas Gregor02a24ee2009-11-03 16:56:39 +00002002 return GetNameFromUnqualifiedId(D.getName());
2003}
2004
Abramo Bagnara25777432010-08-11 22:01:17 +00002005/// \brief Retrieves the declaration name from a parsed unqualified-id.
2006DeclarationNameInfo
2007Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) {
2008 DeclarationNameInfo NameInfo;
2009 NameInfo.setLoc(Name.StartLocation);
2010
Douglas Gregor3f9a0562009-11-03 01:35:08 +00002011 switch (Name.getKind()) {
Sean Hunt0486d742009-11-28 04:44:28 +00002012
Abramo Bagnara25777432010-08-11 22:01:17 +00002013 case UnqualifiedId::IK_Identifier:
2014 NameInfo.setName(Name.Identifier);
2015 NameInfo.setLoc(Name.StartLocation);
2016 return NameInfo;
Sean Hunt0486d742009-11-28 04:44:28 +00002017
Abramo Bagnara25777432010-08-11 22:01:17 +00002018 case UnqualifiedId::IK_OperatorFunctionId:
2019 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName(
2020 Name.OperatorFunctionId.Operator));
2021 NameInfo.setLoc(Name.StartLocation);
2022 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc
2023 = Name.OperatorFunctionId.SymbolLocations[0];
2024 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc
2025 = Name.EndLocation.getRawEncoding();
2026 return NameInfo;
Douglas Gregor0efc2c12010-01-13 17:31:36 +00002027
Abramo Bagnara25777432010-08-11 22:01:17 +00002028 case UnqualifiedId::IK_LiteralOperatorId:
2029 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName(
2030 Name.Identifier));
2031 NameInfo.setLoc(Name.StartLocation);
2032 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation);
2033 return NameInfo;
Douglas Gregor0efc2c12010-01-13 17:31:36 +00002034
Abramo Bagnara25777432010-08-11 22:01:17 +00002035 case UnqualifiedId::IK_ConversionFunctionId: {
2036 TypeSourceInfo *TInfo;
2037 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo);
2038 if (Ty.isNull())
2039 return DeclarationNameInfo();
2040 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName(
2041 Context.getCanonicalType(Ty)));
2042 NameInfo.setLoc(Name.StartLocation);
2043 NameInfo.setNamedTypeInfo(TInfo);
2044 return NameInfo;
Douglas Gregordb422df2009-09-25 21:45:23 +00002045 }
Abramo Bagnara25777432010-08-11 22:01:17 +00002046
2047 case UnqualifiedId::IK_ConstructorName: {
2048 TypeSourceInfo *TInfo;
2049 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo);
2050 if (Ty.isNull())
2051 return DeclarationNameInfo();
2052 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName(
2053 Context.getCanonicalType(Ty)));
2054 NameInfo.setLoc(Name.StartLocation);
2055 NameInfo.setNamedTypeInfo(TInfo);
2056 return NameInfo;
2057 }
2058
2059 case UnqualifiedId::IK_ConstructorTemplateId: {
2060 // In well-formed code, we can only have a constructor
2061 // template-id that refers to the current context, so go there
2062 // to find the actual type being constructed.
2063 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext);
2064 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name)
2065 return DeclarationNameInfo();
2066
2067 // Determine the type of the class being constructed.
2068 QualType CurClassType = Context.getTypeDeclType(CurClass);
2069
2070 // FIXME: Check two things: that the template-id names the same type as
2071 // CurClassType, and that the template-id does not occur when the name
2072 // was qualified.
2073
2074 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName(
2075 Context.getCanonicalType(CurClassType)));
2076 NameInfo.setLoc(Name.StartLocation);
2077 // FIXME: should we retrieve TypeSourceInfo?
2078 NameInfo.setNamedTypeInfo(0);
2079 return NameInfo;
2080 }
2081
2082 case UnqualifiedId::IK_DestructorName: {
2083 TypeSourceInfo *TInfo;
2084 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo);
2085 if (Ty.isNull())
2086 return DeclarationNameInfo();
2087 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName(
2088 Context.getCanonicalType(Ty)));
2089 NameInfo.setLoc(Name.StartLocation);
2090 NameInfo.setNamedTypeInfo(TInfo);
2091 return NameInfo;
2092 }
2093
2094 case UnqualifiedId::IK_TemplateId: {
John McCall2b5289b2010-08-23 07:28:44 +00002095 TemplateName TName = Name.TemplateId->Template.get();
Abramo Bagnara25777432010-08-11 22:01:17 +00002096 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc;
2097 return Context.getNameForTemplate(TName, TNameLoc);
2098 }
2099
2100 } // switch (Name.getKind())
2101
Douglas Gregor10bd3682008-11-17 22:58:34 +00002102 assert(false && "Unknown name kind");
Abramo Bagnara25777432010-08-11 22:01:17 +00002103 return DeclarationNameInfo();
Douglas Gregor10bd3682008-11-17 22:58:34 +00002104}
2105
Douglas Gregor4ce205f2009-02-06 17:46:57 +00002106/// isNearlyMatchingFunction - Determine whether the C++ functions
2107/// Declaration and Definition are "nearly" matching. This heuristic
2108/// is used to improve diagnostics in the case where an out-of-line
2109/// function definition doesn't match any declaration within
2110/// the class or namespace.
2111static bool isNearlyMatchingFunction(ASTContext &Context,
2112 FunctionDecl *Declaration,
2113 FunctionDecl *Definition) {
Douglas Gregor584049d2008-12-15 23:53:10 +00002114 if (Declaration->param_size() != Definition->param_size())
2115 return false;
2116 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) {
2117 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType();
2118 QualType DefParamTy = Definition->getParamDecl(Idx)->getType();
2119
Douglas Gregora4923eb2009-11-16 21:35:15 +00002120 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(),
2121 DefParamTy.getNonReferenceType()))
Douglas Gregor584049d2008-12-15 23:53:10 +00002122 return false;
2123 }
2124
2125 return true;
2126}
2127
John McCall63b43852010-04-29 23:50:39 +00002128/// NeedsRebuildingInCurrentInstantiation - Checks whether the given
2129/// declarator needs to be rebuilt in the current instantiation.
2130/// Any bits of declarator which appear before the name are valid for
2131/// consideration here. That's specifically the type in the decl spec
2132/// and the base type in any member-pointer chunks.
2133static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D,
2134 DeclarationName Name) {
2135 // The types we specifically need to rebuild are:
2136 // - typenames, typeofs, and decltypes
2137 // - types which will become injected class names
2138 // Of course, we also need to rebuild any type referencing such a
2139 // type. It's safest to just say "dependent", but we call out a
2140 // few cases here.
2141
2142 DeclSpec &DS = D.getMutableDeclSpec();
2143 switch (DS.getTypeSpecType()) {
2144 case DeclSpec::TST_typename:
2145 case DeclSpec::TST_typeofType:
John McCall63b43852010-04-29 23:50:39 +00002146 case DeclSpec::TST_decltype: {
2147 // Grab the type from the parser.
2148 TypeSourceInfo *TSI = 0;
John McCallb3d87482010-08-24 05:47:05 +00002149 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI);
John McCall63b43852010-04-29 23:50:39 +00002150 if (T.isNull() || !T->isDependentType()) break;
2151
2152 // Make sure there's a type source info. This isn't really much
2153 // of a waste; most dependent types should have type source info
2154 // attached already.
2155 if (!TSI)
2156 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc());
2157
2158 // Rebuild the type in the current instantiation.
2159 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name);
2160 if (!TSI) return true;
2161
2162 // Store the new type back in the decl spec.
John McCallb3d87482010-08-24 05:47:05 +00002163 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI);
2164 DS.UpdateTypeRep(LocType);
2165 break;
2166 }
2167
2168 case DeclSpec::TST_typeofExpr: {
2169 Expr *E = DS.getRepAsExpr();
John McCall60d7b3a2010-08-24 06:29:42 +00002170 ExprResult Result = S.RebuildExprInCurrentInstantiation(E);
John McCallb3d87482010-08-24 05:47:05 +00002171 if (Result.isInvalid()) return true;
2172 DS.UpdateExprRep(Result.get());
John McCall63b43852010-04-29 23:50:39 +00002173 break;
2174 }
2175
2176 default:
2177 // Nothing to do for these decl specs.
2178 break;
2179 }
2180
2181 // It doesn't matter what order we do this in.
2182 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) {
2183 DeclaratorChunk &Chunk = D.getTypeObject(I);
2184
2185 // The only type information in the declarator which can come
2186 // before the declaration name is the base type of a member
2187 // pointer.
2188 if (Chunk.Kind != DeclaratorChunk::MemberPointer)
2189 continue;
2190
2191 // Rebuild the scope specifier in-place.
2192 CXXScopeSpec &SS = Chunk.Mem.Scope();
2193 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS))
2194 return true;
2195 }
2196
2197 return false;
2198}
2199
John McCall7cd088e2010-08-24 07:21:54 +00002200Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) {
2201 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this), false);
2202}
2203
John McCalld226f652010-08-21 09:40:31 +00002204Decl *Sema::HandleDeclarator(Scope *S, Declarator &D,
2205 MultiTemplateParamsArg TemplateParamLists,
2206 bool IsFunctionDefinition) {
Abramo Bagnara25777432010-08-11 22:01:17 +00002207 // TODO: consider using NameInfo for diagnostic.
2208 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
2209 DeclarationName Name = NameInfo.getName();
Douglas Gregor10bd3682008-11-17 22:58:34 +00002210
Chris Lattnere80a59c2007-07-25 00:24:17 +00002211 // All of these full declarators require an identifier. If it doesn't have
2212 // one, the ParsedFreeStandingDeclSpec action should be used.
Douglas Gregor10bd3682008-11-17 22:58:34 +00002213 if (!Name) {
Chris Lattnereaaebc72009-04-25 08:06:05 +00002214 if (!D.isInvalidType()) // Reject this if we think it is valid.
Chris Lattner1f6f54b2008-11-11 06:13:16 +00002215 Diag(D.getDeclSpec().getSourceRange().getBegin(),
Chris Lattnerfa25bbb2008-11-19 05:08:23 +00002216 diag::err_declarator_need_ident)
2217 << D.getDeclSpec().getSourceRange() << D.getSourceRange();
John McCalld226f652010-08-21 09:40:31 +00002218 return 0;
Chris Lattnere80a59c2007-07-25 00:24:17 +00002219 }
Mike Stump1eb44332009-09-09 15:08:12 +00002220
Chris Lattner31e05722007-08-26 06:24:45 +00002221 // The scope passed in may not be a decl scope. Zip up the scope tree until
2222 // we find one that is.
Douglas Gregor44b43212008-12-11 16:49:14 +00002223 while ((S->getFlags() & Scope::DeclScope) == 0 ||
Douglas Gregoraaba5e32009-02-04 19:02:06 +00002224 (S->getFlags() & Scope::TemplateParamScope) != 0)
Chris Lattner31e05722007-08-26 06:24:45 +00002225 S = S->getParent();
Mike Stump1eb44332009-09-09 15:08:12 +00002226
John McCall63b43852010-04-29 23:50:39 +00002227 DeclContext *DC = CurContext;
2228 if (D.getCXXScopeSpec().isInvalid())
2229 D.setInvalidType();
2230 else if (D.getCXXScopeSpec().isSet()) {
2231 bool EnteringContext = !D.getDeclSpec().isFriendSpecified();
2232 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext);
2233 if (!DC) {
2234 // If we could not compute the declaration context, it's because the
2235 // declaration context is dependent but does not refer to a class,
2236 // class template, or class template partial specialization. Complain
2237 // and return early, to avoid the coming semantic disaster.
2238 Diag(D.getIdentifierLoc(),
2239 diag::err_template_qualified_declarator_no_match)
2240 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep()
2241 << D.getCXXScopeSpec().getRange();
John McCalld226f652010-08-21 09:40:31 +00002242 return 0;
John McCall63b43852010-04-29 23:50:39 +00002243 }
John McCall0dd7ceb2009-12-19 09:35:56 +00002244
John McCall63b43852010-04-29 23:50:39 +00002245 bool IsDependentContext = DC->isDependentContext();
John McCall0dd7ceb2009-12-19 09:35:56 +00002246
John McCall63b43852010-04-29 23:50:39 +00002247 if (!IsDependentContext &&
John McCall77bb1aa2010-05-01 00:40:08 +00002248 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC))
John McCalld226f652010-08-21 09:40:31 +00002249 return 0;
John McCall63b43852010-04-29 23:50:39 +00002250
2251 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) {
2252 Diag(D.getIdentifierLoc(),
2253 diag::err_member_def_undefined_record)
2254 << Name << DC << D.getCXXScopeSpec().getRange();
2255 D.setInvalidType();
2256 }
2257
2258 // Check whether we need to rebuild the type of the given
2259 // declaration in the current instantiation.
2260 if (EnteringContext && IsDependentContext &&
2261 TemplateParamLists.size() != 0) {
2262 ContextRAII SavedContext(*this, DC);
2263 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name))
2264 D.setInvalidType();
Douglas Gregor4a959d82009-08-06 16:20:37 +00002265 }
2266 }
Mike Stump1eb44332009-09-09 15:08:12 +00002267
Douglas Gregor4afa39d2009-01-20 01:17:11 +00002268 NamedDecl *New;
Douglas Gregorcda9c672009-02-16 17:45:42 +00002269
John McCallbf1a0282010-06-04 23:28:52 +00002270 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
2271 QualType R = TInfo->getType();
Douglas Gregord6f7e9d2009-02-24 20:03:32 +00002272
Abramo Bagnara25777432010-08-11 22:01:17 +00002273 LookupResult Previous(*this, NameInfo, LookupOrdinaryName,
John McCall68263142009-11-18 22:49:29 +00002274 ForRedeclaration);
2275
Argyrios Kyrtzidisef6e6472008-11-08 17:17:31 +00002276 // See if this is a redefinition of a variable in the same scope.
John McCall63b43852010-04-29 23:50:39 +00002277 if (!D.getCXXScopeSpec().isSet()) {
John McCall68263142009-11-18 22:49:29 +00002278 bool IsLinkageLookup = false;
Douglas Gregord6f7e9d2009-02-24 20:03:32 +00002279
2280 // If the declaration we're planning to build will be a function
2281 // or object with linkage, then look for another declaration with
2282 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6).
2283 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
2284 /* Do nothing*/;
2285 else if (R->isFunctionType()) {
Douglas Gregor6bec78d2009-07-07 17:00:05 +00002286 if (CurContext->isFunctionOrMethod() ||
2287 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static)
John McCall68263142009-11-18 22:49:29 +00002288 IsLinkageLookup = true;
Douglas Gregord6f7e9d2009-02-24 20:03:32 +00002289 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern)
John McCall68263142009-11-18 22:49:29 +00002290 IsLinkageLookup = true;
Sebastian Redl7a126a42010-08-31 00:36:30 +00002291 else if (CurContext->getRedeclContext()->isTranslationUnit() &&
Douglas Gregor6bec78d2009-07-07 17:00:05 +00002292 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static)
John McCall68263142009-11-18 22:49:29 +00002293 IsLinkageLookup = true;
2294
2295 if (IsLinkageLookup)
2296 Previous.clear(LookupRedeclarationWithLinkage);
Douglas Gregord6f7e9d2009-02-24 20:03:32 +00002297
John McCall68263142009-11-18 22:49:29 +00002298 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup);
Argyrios Kyrtzidisef6e6472008-11-08 17:17:31 +00002299 } else { // Something like "int foo::x;"
John McCall68263142009-11-18 22:49:29 +00002300 LookupQualifiedName(Previous, DC);
2301
2302 // Don't consider using declarations as previous declarations for
2303 // out-of-line members.
2304 RemoveUsingDecls(Previous);
Argyrios Kyrtzidisef6e6472008-11-08 17:17:31 +00002305
2306 // C++ 7.3.1.2p2:
2307 // Members (including explicit specializations of templates) of a named
2308 // namespace can also be defined outside that namespace by explicit
2309 // qualification of the name being defined, provided that the entity being
2310 // defined was already declared in the namespace and the definition appears
2311 // after the point of declaration in a namespace that encloses the
2312 // declarations namespace.
2313 //
Douglas Gregor584049d2008-12-15 23:53:10 +00002314 // Note that we only check the context at this point. We don't yet
2315 // have enough information to make sure that PrevDecl is actually
2316 // the declaration we want to match. For example, given:
2317 //
Douglas Gregor9d350972008-12-12 08:25:50 +00002318 // class X {
2319 // void f();
Douglas Gregor584049d2008-12-15 23:53:10 +00002320 // void f(float);
Douglas Gregor9d350972008-12-12 08:25:50 +00002321 // };
2322 //
Douglas Gregor584049d2008-12-15 23:53:10 +00002323 // void X::f(int) { } // ill-formed
2324 //
2325 // In this case, PrevDecl will point to the overload set
2326 // containing the two f's declared in X, but neither of them
Mike Stump1eb44332009-09-09 15:08:12 +00002327 // matches.
Douglas Gregor4ce205f2009-02-06 17:46:57 +00002328
2329 // First check whether we named the global scope.
2330 if (isa<TranslationUnitDecl>(DC)) {
Mike Stump1eb44332009-09-09 15:08:12 +00002331 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope)
Douglas Gregor4ce205f2009-02-06 17:46:57 +00002332 << Name << D.getCXXScopeSpec().getRange();
Sebastian Redl9770ef02009-11-08 11:36:54 +00002333 } else {
2334 DeclContext *Cur = CurContext;
2335 while (isa<LinkageSpecDecl>(Cur))
2336 Cur = Cur->getParent();
2337 if (!Cur->Encloses(DC)) {
2338 // The qualifying scope doesn't enclose the original declaration.
2339 // Emit diagnostic based on current scope.
2340 SourceLocation L = D.getIdentifierLoc();
2341 SourceRange R = D.getCXXScopeSpec().getRange();
2342 if (isa<FunctionDecl>(Cur))
2343 Diag(L, diag::err_invalid_declarator_in_function) << Name << R;
2344 else
2345 Diag(L, diag::err_invalid_declarator_scope)
2346 << Name << cast<NamedDecl>(DC) << R;
2347 D.setInvalidType();
2348 }
Argyrios Kyrtzidisef6e6472008-11-08 17:17:31 +00002349 }
2350 }
2351
John McCall68263142009-11-18 22:49:29 +00002352 if (Previous.isSingleResult() &&
2353 Previous.getFoundDecl()->isTemplateParameter()) {
Douglas Gregor72c3f312008-12-05 18:15:24 +00002354 // Maybe we will complain about the shadowed template parameter.
Mike Stump1eb44332009-09-09 15:08:12 +00002355 if (!D.isInvalidType())
John McCall68263142009-11-18 22:49:29 +00002356 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(),
2357 Previous.getFoundDecl()))
Chris Lattnereaaebc72009-04-25 08:06:05 +00002358 D.setInvalidType();
Mike Stump1eb44332009-09-09 15:08:12 +00002359
Douglas Gregor72c3f312008-12-05 18:15:24 +00002360 // Just pretend that we didn't see the previous declaration.
John McCall68263142009-11-18 22:49:29 +00002361 Previous.clear();
Douglas Gregor72c3f312008-12-05 18:15:24 +00002362 }
2363
Douglas Gregor2ce52f32008-04-13 21:07:44 +00002364 // In C++, the previous declaration we find might be a tag type
2365 // (class or enum). In this case, the new declaration will hide the
Douglas Gregor66973122009-01-28 17:15:10 +00002366 // tag type. Note that this does does not apply if we're declaring a
2367 // typedef (C++ [dcl.typedef]p4).
John McCall68263142009-11-18 22:49:29 +00002368 if (Previous.isSingleTagDecl() &&
Douglas Gregor66973122009-01-28 17:15:10 +00002369 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef)
John McCall68263142009-11-18 22:49:29 +00002370 Previous.clear();
Douglas Gregor2ce52f32008-04-13 21:07:44 +00002371
Douglas Gregorcda9c672009-02-16 17:45:42 +00002372 bool Redeclaration = false;
Reid Spencer5f016e22007-07-11 17:01:13 +00002373 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) {
Douglas Gregore542c862009-06-23 23:11:28 +00002374 if (TemplateParamLists.size()) {
2375 Diag(D.getIdentifierLoc(), diag::err_template_typedef);
John McCalld226f652010-08-21 09:40:31 +00002376 return 0;
Douglas Gregore542c862009-06-23 23:11:28 +00002377 }
Mike Stump1eb44332009-09-09 15:08:12 +00002378
John McCalla93c9342009-12-07 02:54:59 +00002379 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration);
Douglas Gregord6f7e9d2009-02-24 20:03:32 +00002380 } else if (R->isFunctionType()) {
John McCalla93c9342009-12-07 02:54:59 +00002381 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous,
Douglas Gregore542c862009-06-23 23:11:28 +00002382 move(TemplateParamLists),
Chris Lattnereaaebc72009-04-25 08:06:05 +00002383 IsFunctionDefinition, Redeclaration);
Reid Spencer5f016e22007-07-11 17:01:13 +00002384 } else {
John McCalla93c9342009-12-07 02:54:59 +00002385 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous,
Douglas Gregordfe3f2d2009-07-22 17:18:37 +00002386 move(TemplateParamLists),
2387 Redeclaration);
Reid Spencer5f016e22007-07-11 17:01:13 +00002388 }
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00002389
2390 if (New == 0)
John McCalld226f652010-08-21 09:40:31 +00002391 return 0;
Mike Stump1eb44332009-09-09 15:08:12 +00002392
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00002393 // If this has an identifier and is not an invalid redeclaration or
2394 // function template specialization, add it to the scope stack.
Douglas Gregorf178dca2010-07-24 00:10:38 +00002395 if (New->getDeclName() && !(Redeclaration && New->isInvalidDecl()))
Argyrios Kyrtzidis87f3ff02008-04-12 00:47:19 +00002396 PushOnScopeChains(New, S);
Mike Stump1eb44332009-09-09 15:08:12 +00002397
John McCalld226f652010-08-21 09:40:31 +00002398 return New;
Reid Spencer5f016e22007-07-11 17:01:13 +00002399}
2400
Eli Friedman1ca48132009-02-21 00:44:51 +00002401/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array
2402/// types into constant array types in certain situations which would otherwise
2403/// be errors (for GCC compatibility).
2404static QualType TryToFixInvalidVariablyModifiedType(QualType T,
2405 ASTContext &Context,
Douglas Gregor2767ce22010-08-18 00:39:00 +00002406 bool &SizeIsNegative,
2407 llvm::APSInt &Oversized) {
Eli Friedman1ca48132009-02-21 00:44:51 +00002408 // This method tries to turn a variable array into a constant
2409 // array even when the size isn't an ICE. This is necessary
2410 // for compatibility with code that depends on gcc's buggy
2411 // constant expression folding, like struct {char x[(int)(char*)2];}
2412 SizeIsNegative = false;
Douglas Gregor2767ce22010-08-18 00:39:00 +00002413 Oversized = 0;
2414
2415 if (T->isDependentType())
2416 return QualType();
2417
John McCall0953e762009-09-24 19:53:00 +00002418 QualifierCollector Qs;
2419 const Type *Ty = Qs.strip(T);
2420
2421 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) {
Eli Friedman1ca48132009-02-21 00:44:51 +00002422 QualType Pointee = PTy->getPointeeType();
2423 QualType FixedType =
Douglas Gregor2767ce22010-08-18 00:39:00 +00002424 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative,
2425 Oversized);
Eli Friedman1ca48132009-02-21 00:44:51 +00002426 if (FixedType.isNull()) return FixedType;
Eli Friedman61125c82009-02-21 00:58:02 +00002427 FixedType = Context.getPointerType(FixedType);
John McCall0953e762009-09-24 19:53:00 +00002428 return Qs.apply(FixedType);
Eli Friedman1ca48132009-02-21 00:44:51 +00002429 }
2430
2431 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T);
Eli Friedmanbc592e62009-02-26 03:58:54 +00002432 if (!VLATy)
2433 return QualType();
2434 // FIXME: We should probably handle this case
2435 if (VLATy->getElementType()->isVariablyModifiedType())
2436 return QualType();
Mike Stump1eb44332009-09-09 15:08:12 +00002437
Eli Friedman1ca48132009-02-21 00:44:51 +00002438 Expr::EvalResult EvalResult;
2439 if (!VLATy->getSizeExpr() ||
Eli Friedmanbc592e62009-02-26 03:58:54 +00002440 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) ||
2441 !EvalResult.Val.isInt())
Eli Friedman1ca48132009-02-21 00:44:51 +00002442 return QualType();
Eli Friedmanbc592e62009-02-26 03:58:54 +00002443
Douglas Gregor2767ce22010-08-18 00:39:00 +00002444 // Check whether the array size is negative.
Eli Friedman1ca48132009-02-21 00:44:51 +00002445 llvm::APSInt &Res = EvalResult.Val.getInt();
Douglas Gregor2767ce22010-08-18 00:39:00 +00002446 if (Res.isSigned() && Res.isNegative()) {
2447 SizeIsNegative = true;
2448 return QualType();
Douglas Gregor7e7eb3d2009-07-06 15:59:29 +00002449 }
Eli Friedman1ca48132009-02-21 00:44:51 +00002450
Douglas Gregor2767ce22010-08-18 00:39:00 +00002451 // Check whether the array is too large to be addressed.
2452 unsigned ActiveSizeBits
2453 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(),
2454 Res);
2455 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) {
2456 Oversized = Res;
2457 return QualType();
2458 }
2459
2460 return Context.getConstantArrayType(VLATy->getElementType(),
2461 Res, ArrayType::Normal, 0);
Eli Friedman1ca48132009-02-21 00:44:51 +00002462}
2463
Douglas Gregor63935192009-03-02 00:19:53 +00002464/// \brief Register the given locally-scoped external C declaration so
2465/// that it can be found later for redeclarations
Mike Stump1eb44332009-09-09 15:08:12 +00002466void
John McCall68263142009-11-18 22:49:29 +00002467Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND,
2468 const LookupResult &Previous,
Douglas Gregor63935192009-03-02 00:19:53 +00002469 Scope *S) {
2470 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() &&
2471 "Decl is not a locally-scoped decl!");
2472 // Note that we have a locally-scoped external with this name.
2473 LocallyScopedExternalDecls[ND->getDeclName()] = ND;
2474
John McCall68263142009-11-18 22:49:29 +00002475 if (!Previous.isSingleResult())
Douglas Gregor63935192009-03-02 00:19:53 +00002476 return;
2477
John McCall68263142009-11-18 22:49:29 +00002478 NamedDecl *PrevDecl = Previous.getFoundDecl();
2479
Douglas Gregor63935192009-03-02 00:19:53 +00002480 // If there was a previous declaration of this variable, it may be
2481 // in our identifier chain. Update the identifier chain with the new
2482 // declaration.
Douglas Gregor2dc0e642009-03-23 23:06:20 +00002483 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) {
Douglas Gregor63935192009-03-02 00:19:53 +00002484 // The previous declaration was found on the identifer resolver
2485 // chain, so remove it from its scope.
John McCalld226f652010-08-21 09:40:31 +00002486 while (S && !S->isDeclScope(PrevDecl))
Douglas Gregor63935192009-03-02 00:19:53 +00002487 S = S->getParent();
2488
2489 if (S)
John McCalld226f652010-08-21 09:40:31 +00002490 S->RemoveDecl(PrevDecl);
Douglas Gregor63935192009-03-02 00:19:53 +00002491 }
2492}
2493
Eli Friedman85a53192009-04-07 19:37:57 +00002494/// \brief Diagnose function specifiers on a declaration of an identifier that
2495/// does not identify a function.
2496void Sema::DiagnoseFunctionSpecifiers(Declarator& D) {
2497 // FIXME: We should probably indicate the identifier in question to avoid
2498 // confusion for constructs like "inline int a(), b;"
2499 if (D.getDeclSpec().isInlineSpecified())
Mike Stump1eb44332009-09-09 15:08:12 +00002500 Diag(D.getDeclSpec().getInlineSpecLoc(),
Eli Friedman85a53192009-04-07 19:37:57 +00002501 diag::err_inline_non_function);
2502
2503 if (D.getDeclSpec().isVirtualSpecified())
Mike Stump1eb44332009-09-09 15:08:12 +00002504 Diag(D.getDeclSpec().getVirtualSpecLoc(),
Eli Friedman85a53192009-04-07 19:37:57 +00002505 diag::err_virtual_non_function);
2506
2507 if (D.getDeclSpec().isExplicitSpecified())
Mike Stump1eb44332009-09-09 15:08:12 +00002508 Diag(D.getDeclSpec().getExplicitSpecLoc(),
Eli Friedman85a53192009-04-07 19:37:57 +00002509 diag::err_explicit_non_function);
2510}
2511
Douglas Gregor4afa39d2009-01-20 01:17:11 +00002512NamedDecl*
Zhongxing Xud5ed8c32009-01-16 03:34:13 +00002513Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC,
John McCalla93c9342009-12-07 02:54:59 +00002514 QualType R, TypeSourceInfo *TInfo,
John McCall68263142009-11-18 22:49:29 +00002515 LookupResult &Previous, bool &Redeclaration) {
Zhongxing Xud5ed8c32009-01-16 03:34:13 +00002516 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1).
2517 if (D.getCXXScopeSpec().isSet()) {
2518 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator)
2519 << D.getCXXScopeSpec().getRange();
Chris Lattnereaaebc72009-04-25 08:06:05 +00002520 D.setInvalidType();
Zhongxing Xud5ed8c32009-01-16 03:34:13 +00002521 // Pretend we didn't see the scope specifier.
Douglas Gregor9de672f2010-03-23 15:26:55 +00002522 DC = CurContext;
2523 Previous.clear();
Zhongxing Xud5ed8c32009-01-16 03:34:13 +00002524 }
2525
Douglas Gregor021c3b32009-03-11 23:00:04 +00002526 if (getLangOptions().CPlusPlus) {
2527 // Check that there are no default arguments (C++ only).
Zhongxing Xud5ed8c32009-01-16 03:34:13 +00002528 CheckExtraCXXDefaultArguments(D);
Douglas Gregor021c3b32009-03-11 23:00:04 +00002529 }
2530
Eli Friedman85a53192009-04-07 19:37:57 +00002531 DiagnoseFunctionSpecifiers(D);
2532
Eli Friedman63054b32009-04-19 20:27:55 +00002533 if (D.getDeclSpec().isThreadSpecified())
2534 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
2535
Douglas Gregoraef01992010-07-13 06:37:01 +00002536 if (D.getName().Kind != UnqualifiedId::IK_Identifier) {
2537 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier)
2538 << D.getName().getSourceRange();
2539 return 0;
2540 }
2541
John McCalla93c9342009-12-07 02:54:59 +00002542 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo);
Zhongxing Xud5ed8c32009-01-16 03:34:13 +00002543 if (!NewTD) return 0;
Mike Stump1eb44332009-09-09 15:08:12 +00002544
Zhongxing Xud5ed8c32009-01-16 03:34:13 +00002545 // Handle attributes prior to checking for duplicates in MergeVarDecl
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00002546 ProcessDeclAttributes(S, NewTD, D);
John McCall68263142009-11-18 22:49:29 +00002547
Chris Lattner38c5ebd2009-04-19 05:21:20 +00002548 // C99 6.7.7p2: If a typedef name specifies a variably modified type
2549 // then it shall have block scope.
Eli Friedmanbf87f2c2010-08-10 03:13:15 +00002550 // Note that variably modified types must be fixed before merging the decl so
2551 // that redeclarations will match.
Chris Lattner38c5ebd2009-04-19 05:21:20 +00002552 QualType T = NewTD->getUnderlyingType();
2553 if (T->isVariablyModifiedType()) {
John McCall781472f2010-08-25 08:40:02 +00002554 getCurFunction()->setHasBranchProtectedScope();
Mike Stump1eb44332009-09-09 15:08:12 +00002555
Chris Lattner38c5ebd2009-04-19 05:21:20 +00002556 if (S->getFnParent() == 0) {
Eli Friedman1ca48132009-02-21 00:44:51 +00002557 bool SizeIsNegative;
Douglas Gregor2767ce22010-08-18 00:39:00 +00002558 llvm::APSInt Oversized;
Eli Friedman1ca48132009-02-21 00:44:51 +00002559 QualType FixedTy =
Douglas Gregor2767ce22010-08-18 00:39:00 +00002560 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative,
2561 Oversized);
Eli Friedman1ca48132009-02-21 00:44:51 +00002562 if (!FixedTy.isNull()) {
2563 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size);
John McCalla93c9342009-12-07 02:54:59 +00002564 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy));
Eli Friedman1ca48132009-02-21 00:44:51 +00002565 } else {
2566 if (SizeIsNegative)
2567 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size);
2568 else if (T->isVariableArrayType())
2569 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope);
Douglas Gregor2767ce22010-08-18 00:39:00 +00002570 else if (Oversized.getBoolValue())
2571 Diag(D.getIdentifierLoc(), diag::err_array_too_large)
2572 << Oversized.toString(10);
Eli Friedman1ca48132009-02-21 00:44:51 +00002573 else
2574 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope);
Chris Lattnereaaebc72009-04-25 08:06:05 +00002575 NewTD->setInvalidDecl();
Eli Friedman1ca48132009-02-21 00:44:51 +00002576 }
Zhongxing Xud5ed8c32009-01-16 03:34:13 +00002577 }
2578 }
Douglas Gregorc29f77b2009-07-07 16:35:42 +00002579
Eli Friedmanbf87f2c2010-08-10 03:13:15 +00002580 // Merge the decl with the existing one if appropriate. If the decl is
2581 // in an outer scope, it isn't the same thing.
2582 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false);
2583 if (!Previous.empty()) {
2584 Redeclaration = true;
2585 MergeTypeDefDecl(NewTD, Previous);
2586 }
2587
Douglas Gregorc29f77b2009-07-07 16:35:42 +00002588 // If this is the C FILE type, notify the AST context.
2589 if (IdentifierInfo *II = NewTD->getIdentifier())
2590 if (!NewTD->isInvalidDecl() &&
Sebastian Redl7a126a42010-08-31 00:36:30 +00002591 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) {
Mike Stump782fa302009-07-28 02:25:19 +00002592 if (II->isStr("FILE"))
2593 Context.setFILEDecl(NewTD);
2594 else if (II->isStr("jmp_buf"))
2595 Context.setjmp_bufDecl(NewTD);
2596 else if (II->isStr("sigjmp_buf"))
2597 Context.setsigjmp_bufDecl(NewTD);
2598 }
2599
Zhongxing Xud5ed8c32009-01-16 03:34:13 +00002600 return NewTD;
2601}
2602
Douglas Gregor8f301052009-02-24 19:23:27 +00002603/// \brief Determines whether the given declaration is an out-of-scope
2604/// previous declaration.
2605///
2606/// This routine should be invoked when name lookup has found a
2607/// previous declaration (PrevDecl) that is not in the scope where a
2608/// new declaration by the same name is being introduced. If the new
2609/// declaration occurs in a local scope, previous declarations with
2610/// linkage may still be considered previous declarations (C99
2611/// 6.2.2p4-5, C++ [basic.link]p6).
2612///
2613/// \param PrevDecl the previous declaration found by name
2614/// lookup
Mike Stump1eb44332009-09-09 15:08:12 +00002615///
Douglas Gregor8f301052009-02-24 19:23:27 +00002616/// \param DC the context in which the new declaration is being
2617/// declared.
2618///
2619/// \returns true if PrevDecl is an out-of-scope previous declaration
2620/// for a new delcaration with the same name.
Mike Stump1eb44332009-09-09 15:08:12 +00002621static bool
Douglas Gregor8f301052009-02-24 19:23:27 +00002622isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC,
2623 ASTContext &Context) {
2624 if (!PrevDecl)
Sebastian Redl7a126a42010-08-31 00:36:30 +00002625 return false;
Douglas Gregor8f301052009-02-24 19:23:27 +00002626
Douglas Gregord6f7e9d2009-02-24 20:03:32 +00002627 if (!PrevDecl->hasLinkage())
2628 return false;
Douglas Gregor8f301052009-02-24 19:23:27 +00002629
2630 if (Context.getLangOptions().CPlusPlus) {
2631 // C++ [basic.link]p6:
2632 // If there is a visible declaration of an entity with linkage
2633 // having the same name and type, ignoring entities declared
2634 // outside the innermost enclosing namespace scope, the block
2635 // scope declaration declares that same entity and receives the
2636 // linkage of the previous declaration.
Sebastian Redl7a126a42010-08-31 00:36:30 +00002637 DeclContext *OuterContext = DC->getRedeclContext();
Douglas Gregor8f301052009-02-24 19:23:27 +00002638 if (!OuterContext->isFunctionOrMethod())
2639 // This rule only applies to block-scope declarations.
2640 return false;
Douglas Gregor757c6002010-08-27 22:55:10 +00002641
2642 DeclContext *PrevOuterContext = PrevDecl->getDeclContext();
2643 if (PrevOuterContext->isRecord())
2644 // We found a member function: ignore it.
2645 return false;
2646
2647 // Find the innermost enclosing namespace for the new and
2648 // previous declarations.
Sebastian Redl7a126a42010-08-31 00:36:30 +00002649 OuterContext = OuterContext->getEnclosingNamespaceContext();
2650 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext();
Mike Stump1eb44332009-09-09 15:08:12 +00002651
Douglas Gregor757c6002010-08-27 22:55:10 +00002652 // The previous declaration is in a different namespace, so it
2653 // isn't the same function.
2654 if (!OuterContext->Equals(PrevOuterContext))
2655 return false;
Douglas Gregor8f301052009-02-24 19:23:27 +00002656 }
2657
Douglas Gregor8f301052009-02-24 19:23:27 +00002658 return true;
2659}
2660
John McCallb6217662010-03-15 10:12:16 +00002661static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) {
2662 CXXScopeSpec &SS = D.getCXXScopeSpec();
2663 if (!SS.isSet()) return;
2664 DD->setQualifierInfo(static_cast<NestedNameSpecifier*>(SS.getScopeRep()),
2665 SS.getRange());
2666}
2667
Douglas Gregor4afa39d2009-01-20 01:17:11 +00002668NamedDecl*
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00002669Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC,
John McCalla93c9342009-12-07 02:54:59 +00002670 QualType R, TypeSourceInfo *TInfo,
John McCall68263142009-11-18 22:49:29 +00002671 LookupResult &Previous,
Douglas Gregordfe3f2d2009-07-22 17:18:37 +00002672 MultiTemplateParamsArg TemplateParamLists,
Douglas Gregorcda9c672009-02-16 17:45:42 +00002673 bool &Redeclaration) {
Abramo Bagnara25777432010-08-11 22:01:17 +00002674 DeclarationName Name = GetNameForDeclarator(D).getName();
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00002675
2676 // Check that there are no default arguments (C++ only).
2677 if (getLangOptions().CPlusPlus)
2678 CheckExtraCXXDefaultArguments(D);
2679
Douglas Gregor16573fa2010-04-19 22:54:31 +00002680 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec();
2681 assert(SCSpec != DeclSpec::SCS_typedef &&
2682 "Parser allowed 'typedef' as storage class VarDecl.");
Abramo Bagnara35f9a192010-07-30 16:47:02 +00002683 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec);
Douglas Gregor16573fa2010-04-19 22:54:31 +00002684 if (SCSpec == DeclSpec::SCS_mutable) {
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00002685 // mutable can only appear on non-static class members, so it's always
2686 // an error here
2687 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember);
Chris Lattnereaaebc72009-04-25 08:06:05 +00002688 D.setInvalidType();
John McCalld931b082010-08-26 03:08:43 +00002689 SC = SC_None;
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00002690 }
Douglas Gregor16573fa2010-04-19 22:54:31 +00002691 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten();
2692 VarDecl::StorageClass SCAsWritten
Abramo Bagnara35f9a192010-07-30 16:47:02 +00002693 = StorageClassSpecToVarDeclStorageClass(SCSpec);
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00002694
2695 IdentifierInfo *II = Name.getAsIdentifierInfo();
2696 if (!II) {
2697 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name)
2698 << Name.getAsString();
2699 return 0;
2700 }
2701
Eli Friedman85a53192009-04-07 19:37:57 +00002702 DiagnoseFunctionSpecifiers(D);
Douglas Gregor021c3b32009-03-11 23:00:04 +00002703
Douglas Gregor2d2e9cf2009-03-11 20:22:50 +00002704 if (!DC->isRecord() && S->getFnParent() == 0) {
2705 // C99 6.9p2: The storage-class specifiers auto and register shall not
2706 // appear in the declaration specifiers in an external declaration.
John McCalld931b082010-08-26 03:08:43 +00002707 if (SC == SC_Auto || SC == SC_Register) {
Mike Stump1eb44332009-09-09 15:08:12 +00002708
Chris Lattnerd4b19d52009-05-12 21:44:00 +00002709 // If this is a register variable with an asm label specified, then this
2710 // is a GNU extension.
John McCalld931b082010-08-26 03:08:43 +00002711 if (SC == SC_Register && D.getAsmLabel())
Chris Lattnerd4b19d52009-05-12 21:44:00 +00002712 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register);
2713 else
2714 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope);
Chris Lattnereaaebc72009-04-25 08:06:05 +00002715 D.setInvalidType();
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00002716 }
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00002717 }
Douglas Gregor656de632009-03-11 23:52:16 +00002718 if (DC->isRecord() && !CurContext->isRecord()) {
2719 // This is an out-of-line definition of a static data member.
John McCalld931b082010-08-26 03:08:43 +00002720 if (SC == SC_Static) {
Mike Stump1eb44332009-09-09 15:08:12 +00002721 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
Douglas Gregor656de632009-03-11 23:52:16 +00002722 diag::err_static_out_of_line)
Douglas Gregor849b2432010-03-31 17:46:05 +00002723 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
John McCalld931b082010-08-26 03:08:43 +00002724 } else if (SC == SC_None)
2725 SC = SC_Static;
Douglas Gregor656de632009-03-11 23:52:16 +00002726 }
John McCalld931b082010-08-26 03:08:43 +00002727 if (SC == SC_Static) {
Anders Carlssone98da2e2009-06-24 00:28:53 +00002728 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) {
2729 if (RD->isLocalClass())
Mike Stump1eb44332009-09-09 15:08:12 +00002730 Diag(D.getIdentifierLoc(),
Anders Carlssone98da2e2009-06-24 00:28:53 +00002731 diag::err_static_data_member_not_allowed_in_local_class)
2732 << Name << RD->getDeclName();
2733 }
2734 }
Mike Stump1eb44332009-09-09 15:08:12 +00002735
Douglas Gregordfe3f2d2009-07-22 17:18:37 +00002736 // Match up the template parameter lists with the scope specifier, then
2737 // determine whether we have a template or a template specialization.
Douglas Gregor1fef4e62009-10-07 22:35:40 +00002738 bool isExplicitSpecialization = false;
Abramo Bagnara9b934882010-06-12 08:15:14 +00002739 unsigned NumMatchedTemplateParamLists = TemplateParamLists.size();
Douglas Gregor0167f3c2010-07-14 23:14:12 +00002740 bool Invalid = false;
Douglas Gregordfe3f2d2009-07-22 17:18:37 +00002741 if (TemplateParameterList *TemplateParams
Douglas Gregor1fef4e62009-10-07 22:35:40 +00002742 = MatchTemplateParametersToScopeSpecifier(
Douglas Gregordfe3f2d2009-07-22 17:18:37 +00002743 D.getDeclSpec().getSourceRange().getBegin(),
Douglas Gregor1fef4e62009-10-07 22:35:40 +00002744 D.getCXXScopeSpec(),
Douglas Gregor27eeb5e2009-07-22 22:05:02 +00002745 (TemplateParameterList**)TemplateParamLists.get(),
Douglas Gregor1fef4e62009-10-07 22:35:40 +00002746 TemplateParamLists.size(),
John McCall77e8b112010-04-13 20:37:33 +00002747 /*never a friend*/ false,
Douglas Gregor0167f3c2010-07-14 23:14:12 +00002748 isExplicitSpecialization,
2749 Invalid)) {
Abramo Bagnara9b934882010-06-12 08:15:14 +00002750 // All but one template parameter lists have been matching.
2751 --NumMatchedTemplateParamLists;
2752
Douglas Gregordfe3f2d2009-07-22 17:18:37 +00002753 if (TemplateParams->size() > 0) {
2754 // There is no such thing as a variable template.
2755 Diag(D.getIdentifierLoc(), diag::err_template_variable)
2756 << II
2757 << SourceRange(TemplateParams->getTemplateLoc(),
2758 TemplateParams->getRAngleLoc());
2759 return 0;
2760 } else {
2761 // There is an extraneous 'template<>' for this variable. Complain
2762 // about it, but allow the declaration of the variable.
Mike Stump1eb44332009-09-09 15:08:12 +00002763 Diag(TemplateParams->getTemplateLoc(),
Douglas Gregor7cdbc582009-07-22 23:48:44 +00002764 diag::err_template_variable_noparams)
Douglas Gregordfe3f2d2009-07-22 17:18:37 +00002765 << II
2766 << SourceRange(TemplateParams->getTemplateLoc(),
Mike Stump1eb44332009-09-09 15:08:12 +00002767 TemplateParams->getRAngleLoc());
Douglas Gregor1fef4e62009-10-07 22:35:40 +00002768
2769 isExplicitSpecialization = true;
Douglas Gregordfe3f2d2009-07-22 17:18:37 +00002770 }
Mike Stump1eb44332009-09-09 15:08:12 +00002771 }
2772
Douglas Gregor16573fa2010-04-19 22:54:31 +00002773 VarDecl *NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(),
2774 II, R, TInfo, SC, SCAsWritten);
Eli Friedman63054b32009-04-19 20:27:55 +00002775
Douglas Gregor0167f3c2010-07-14 23:14:12 +00002776 if (D.isInvalidType() || Invalid)
Chris Lattnereaaebc72009-04-25 08:06:05 +00002777 NewVD->setInvalidDecl();
Mike Stump1eb44332009-09-09 15:08:12 +00002778
John McCallb6217662010-03-15 10:12:16 +00002779 SetNestedNameSpecifier(NewVD, D);
2780
Douglas Gregor98c2e622010-07-28 23:59:57 +00002781 if (NumMatchedTemplateParamLists > 0 && D.getCXXScopeSpec().isSet()) {
Douglas Gregorc722ea42010-06-15 17:44:38 +00002782 NewVD->setTemplateParameterListsInfo(Context,
2783 NumMatchedTemplateParamLists,
Abramo Bagnara9b934882010-06-12 08:15:14 +00002784 (TemplateParameterList**)TemplateParamLists.release());
2785 }
2786
Eli Friedman63054b32009-04-19 20:27:55 +00002787 if (D.getDeclSpec().isThreadSpecified()) {
2788 if (NewVD->hasLocalStorage())
2789 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global);
Eli Friedman4fb71b02009-04-19 21:48:33 +00002790 else if (!Context.Target.isTLSSupported())
2791 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported);
Eli Friedman63054b32009-04-19 20:27:55 +00002792 else
2793 NewVD->setThreadSpecified(true);
2794 }
Douglas Gregor4afa39d2009-01-20 01:17:11 +00002795
Douglas Gregor656de632009-03-11 23:52:16 +00002796 // Set the lexical context. If the declarator has a C++ scope specifier, the
2797 // lexical context will be different from the semantic context.
2798 NewVD->setLexicalDeclContext(CurContext);
2799
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00002800 // Handle attributes prior to checking for duplicates in MergeVarDecl
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00002801 ProcessDeclAttributes(S, NewVD, D);
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00002802
2803 // Handle GNU asm-label extension (encoded as an attribute).
2804 if (Expr *E = (Expr*) D.getAsmLabel()) {
2805 // The parser guarantees this is a string.
Mike Stump1eb44332009-09-09 15:08:12 +00002806 StringLiteral *SE = cast<StringLiteral>(E);
Sean Huntcf807c42010-08-18 23:23:40 +00002807 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0),
2808 Context, SE->getString()));
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00002809 }
2810
John McCall8472af42010-03-16 21:48:18 +00002811 // Diagnose shadowed variables before filtering for scope.
John McCalla369a952010-03-20 04:12:52 +00002812 if (!D.getCXXScopeSpec().isSet())
John McCall053f4bd2010-03-22 09:20:08 +00002813 CheckShadow(S, NewVD, Previous);
John McCall8472af42010-03-16 21:48:18 +00002814
John McCall68263142009-11-18 22:49:29 +00002815 // Don't consider existing declarations that are in a different
2816 // scope and are out-of-semantic-context declarations (if the new
2817 // declaration has linkage).
2818 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage());
Douglas Gregor251b4ff2009-10-08 07:24:58 +00002819
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002820 // Merge the decl with the existing one if appropriate.
John McCall68263142009-11-18 22:49:29 +00002821 if (!Previous.empty()) {
2822 if (Previous.isSingleResult() &&
2823 isa<FieldDecl>(Previous.getFoundDecl()) &&
2824 D.getCXXScopeSpec().isSet()) {
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002825 // The user tried to define a non-static data member
2826 // out-of-line (C++ [dcl.meaning]p1).
2827 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line)
2828 << D.getCXXScopeSpec().getRange();
John McCall68263142009-11-18 22:49:29 +00002829 Previous.clear();
Chris Lattnereaaebc72009-04-25 08:06:05 +00002830 NewVD->setInvalidDecl();
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002831 }
2832 } else if (D.getCXXScopeSpec().isSet()) {
2833 // No previous declaration in the qualifying scope.
Douglas Gregor3f093272009-10-13 21:16:44 +00002834 Diag(D.getIdentifierLoc(), diag::err_no_member)
2835 << Name << computeDeclContext(D.getCXXScopeSpec(), true)
2836 << D.getCXXScopeSpec().getRange();
Chris Lattnereaaebc72009-04-25 08:06:05 +00002837 NewVD->setInvalidDecl();
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002838 }
2839
John McCall68263142009-11-18 22:49:29 +00002840 CheckVariableDeclaration(NewVD, Previous, Redeclaration);
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002841
Douglas Gregor251b4ff2009-10-08 07:24:58 +00002842 // This is an explicit specialization of a static data member. Check it.
2843 if (isExplicitSpecialization && !NewVD->isInvalidDecl() &&
John McCall68263142009-11-18 22:49:29 +00002844 CheckMemberSpecialization(NewVD, Previous))
Douglas Gregor251b4ff2009-10-08 07:24:58 +00002845 NewVD->setInvalidDecl();
John McCall68263142009-11-18 22:49:29 +00002846
Ryan Flynn478fbc62009-07-25 22:29:44 +00002847 // attributes declared post-definition are currently ignored
Sean Huntcf807c42010-08-18 23:23:40 +00002848 // FIXME: This should be handled in attribute merging, not
2849 // here.
John McCall68263142009-11-18 22:49:29 +00002850 if (Previous.isSingleResult()) {
Sebastian Redl31310a22010-02-01 20:16:42 +00002851 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl());
2852 if (Def && (Def = Def->getDefinition()) &&
2853 Def != NewVD && D.hasAttributes()) {
Ryan Flynn478fbc62009-07-25 22:29:44 +00002854 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition);
2855 Diag(Def->getLocation(), diag::note_previous_definition);
2856 }
2857 }
2858
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002859 // If this is a locally-scoped extern C variable, update the map of
2860 // such variables.
Douglas Gregor48a83b52009-09-12 00:17:51 +00002861 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() &&
Chris Lattnereaaebc72009-04-25 08:06:05 +00002862 !NewVD->isInvalidDecl())
John McCall68263142009-11-18 22:49:29 +00002863 RegisterLocallyScopedExternCDecl(NewVD, Previous, S);
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002864
Eli Friedmanaa8b0d12010-08-05 06:57:20 +00002865 // If there's a #pragma GCC visibility in scope, and this isn't a class
2866 // member, set the visibility of this variable.
2867 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord())
2868 AddPushedVisibilityAttribute(NewVD);
2869
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00002870 MarkUnusedFileScopedDecl(NewVD);
2871
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002872 return NewVD;
2873}
2874
John McCall053f4bd2010-03-22 09:20:08 +00002875/// \brief Diagnose variable or built-in function shadowing. Implements
2876/// -Wshadow.
John McCall8472af42010-03-16 21:48:18 +00002877///
John McCall053f4bd2010-03-22 09:20:08 +00002878/// This method is called whenever a VarDecl is added to a "useful"
2879/// scope.
John McCall8472af42010-03-16 21:48:18 +00002880///
John McCalla369a952010-03-20 04:12:52 +00002881/// \param S the scope in which the shadowing name is being declared
2882/// \param R the lookup of the name
John McCall8472af42010-03-16 21:48:18 +00002883///
John McCall053f4bd2010-03-22 09:20:08 +00002884void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) {
John McCall8472af42010-03-16 21:48:18 +00002885 // Return if warning is ignored.
2886 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow) == Diagnostic::Ignored)
2887 return;
2888
John McCalla369a952010-03-20 04:12:52 +00002889 // Don't diagnose declarations at file scope. The scope might not
2890 // have a DeclContext if (e.g.) we're parsing a function prototype.
2891 DeclContext *NewDC = static_cast<DeclContext*>(S->getEntity());
2892 if (NewDC && NewDC->isFileContext())
John McCall8472af42010-03-16 21:48:18 +00002893 return;
John McCalla369a952010-03-20 04:12:52 +00002894
2895 // Only diagnose if we're shadowing an unambiguous field or variable.
Douglas Gregorc48c9162010-03-17 16:03:44 +00002896 if (R.getResultKind() != LookupResult::Found)
John McCall8472af42010-03-16 21:48:18 +00002897 return;
John McCall8472af42010-03-16 21:48:18 +00002898
John McCall8472af42010-03-16 21:48:18 +00002899 NamedDecl* ShadowedDecl = R.getFoundDecl();
2900 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl))
2901 return;
2902
John McCalla369a952010-03-20 04:12:52 +00002903 DeclContext *OldDC = ShadowedDecl->getDeclContext();
2904
2905 // Only warn about certain kinds of shadowing for class members.
2906 if (NewDC && NewDC->isRecord()) {
2907 // In particular, don't warn about shadowing non-class members.
2908 if (!OldDC->isRecord())
2909 return;
2910
2911 // TODO: should we warn about static data members shadowing
2912 // static data members from base classes?
2913
2914 // TODO: don't diagnose for inaccessible shadowed members.
2915 // This is hard to do perfectly because we might friend the
2916 // shadowing context, but that's just a false negative.
2917 }
2918
2919 // Determine what kind of declaration we're shadowing.
John McCall8472af42010-03-16 21:48:18 +00002920 unsigned Kind;
John McCalla369a952010-03-20 04:12:52 +00002921 if (isa<RecordDecl>(OldDC)) {
John McCall8472af42010-03-16 21:48:18 +00002922 if (isa<FieldDecl>(ShadowedDecl))
2923 Kind = 3; // field
2924 else
2925 Kind = 2; // static data member
John McCalla369a952010-03-20 04:12:52 +00002926 } else if (OldDC->isFileContext())
John McCall8472af42010-03-16 21:48:18 +00002927 Kind = 1; // global
2928 else
2929 Kind = 0; // local
2930
John McCalla369a952010-03-20 04:12:52 +00002931 DeclarationName Name = R.getLookupName();
2932
John McCall8472af42010-03-16 21:48:18 +00002933 // Emit warning and note.
John McCalla369a952010-03-20 04:12:52 +00002934 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC;
John McCall8472af42010-03-16 21:48:18 +00002935 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration);
2936}
2937
John McCall053f4bd2010-03-22 09:20:08 +00002938/// \brief Check -Wshadow without the advantage of a previous lookup.
2939void Sema::CheckShadow(Scope *S, VarDecl *D) {
2940 LookupResult R(*this, D->getDeclName(), D->getLocation(),
2941 Sema::LookupOrdinaryName, Sema::ForRedeclaration);
2942 LookupName(R, S);
2943 CheckShadow(S, D, R);
2944}
2945
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002946/// \brief Perform semantic checking on a newly-created variable
2947/// declaration.
2948///
2949/// This routine performs all of the type-checking required for a
Douglas Gregor180bb632009-05-01 15:47:09 +00002950/// variable declaration once it has been built. It is used both to
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002951/// check variables after they have been parsed and their declarators
Douglas Gregor180bb632009-05-01 15:47:09 +00002952/// have been translated into a declaration, and to check variables
2953/// that have been instantiated from a template.
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002954///
Chris Lattnereaaebc72009-04-25 08:06:05 +00002955/// Sets NewVD->isInvalidDecl() if an error was encountered.
John McCall68263142009-11-18 22:49:29 +00002956void Sema::CheckVariableDeclaration(VarDecl *NewVD,
2957 LookupResult &Previous,
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002958 bool &Redeclaration) {
Chris Lattnereaaebc72009-04-25 08:06:05 +00002959 // If the decl is already known invalid, don't check it.
2960 if (NewVD->isInvalidDecl())
2961 return;
Mike Stump1eb44332009-09-09 15:08:12 +00002962
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002963 QualType T = NewVD->getType();
2964
John McCallc12c5bb2010-05-15 11:32:37 +00002965 if (T->isObjCObjectType()) {
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002966 Diag(NewVD->getLocation(), diag::err_statically_allocated_object);
Chris Lattnereaaebc72009-04-25 08:06:05 +00002967 return NewVD->setInvalidDecl();
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002968 }
Mike Stump1eb44332009-09-09 15:08:12 +00002969
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00002970 // Emit an error if an address space was applied to decl with local storage.
2971 // This includes arrays of objects with address space qualifiers, but not
2972 // automatic variables that point to other address spaces.
2973 // ISO/IEC TR 18037 S5.1.2
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002974 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) {
2975 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl);
Chris Lattnereaaebc72009-04-25 08:06:05 +00002976 return NewVD->setInvalidDecl();
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00002977 }
Fariborz Jahanian7b5b3172009-02-21 19:44:02 +00002978
Mike Stumpf33651c2009-04-14 00:57:29 +00002979 if (NewVD->hasLocalStorage() && T.isObjCGCWeak()
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00002980 && !NewVD->hasAttr<BlocksAttr>())
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002981 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local);
Fariborz Jahanian7b5b3172009-02-21 19:44:02 +00002982
Chris Lattner38c5ebd2009-04-19 05:21:20 +00002983 bool isVM = T->isVariablyModifiedType();
Chris Lattnerbe6d2592009-07-19 20:17:11 +00002984 if (isVM || NewVD->hasAttr<CleanupAttr>() ||
John McCalle46f62c2010-08-01 01:24:59 +00002985 NewVD->hasAttr<BlocksAttr>())
John McCall781472f2010-08-25 08:40:02 +00002986 getCurFunction()->setHasBranchProtectedScope();
Mike Stump1eb44332009-09-09 15:08:12 +00002987
Chris Lattner38c5ebd2009-04-19 05:21:20 +00002988 if ((isVM && NewVD->hasLinkage()) ||
2989 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) {
Anders Carlsson1a7acfa2009-02-28 21:56:50 +00002990 bool SizeIsNegative;
Douglas Gregor2767ce22010-08-18 00:39:00 +00002991 llvm::APSInt Oversized;
Anders Carlsson1a7acfa2009-02-28 21:56:50 +00002992 QualType FixedTy =
Douglas Gregor2767ce22010-08-18 00:39:00 +00002993 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative,
2994 Oversized);
Mike Stump1eb44332009-09-09 15:08:12 +00002995
Chris Lattnereaaebc72009-04-25 08:06:05 +00002996 if (FixedTy.isNull() && T->isVariableArrayType()) {
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00002997 const VariableArrayType *VAT = Context.getAsVariableArrayType(T);
Mike Stump1eb44332009-09-09 15:08:12 +00002998 // FIXME: This won't give the correct result for
2999 // int a[10][n];
Anders Carlsson1a7acfa2009-02-28 21:56:50 +00003000 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange();
Mike Stump1eb44332009-09-09 15:08:12 +00003001
Anders Carlsson1a7acfa2009-02-28 21:56:50 +00003002 if (NewVD->isFileVarDecl())
3003 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope)
Chris Lattnereaaebc72009-04-25 08:06:05 +00003004 << SizeRange;
John McCalld931b082010-08-26 03:08:43 +00003005 else if (NewVD->getStorageClass() == SC_Static)
Anders Carlsson1a7acfa2009-02-28 21:56:50 +00003006 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage)
Chris Lattnereaaebc72009-04-25 08:06:05 +00003007 << SizeRange;
Anders Carlsson1a7acfa2009-02-28 21:56:50 +00003008 else
3009 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage)
Chris Lattnereaaebc72009-04-25 08:06:05 +00003010 << SizeRange;
3011 return NewVD->setInvalidDecl();
Mike Stump1eb44332009-09-09 15:08:12 +00003012 }
3013
Chris Lattnereaaebc72009-04-25 08:06:05 +00003014 if (FixedTy.isNull()) {
Anders Carlsson1a7acfa2009-02-28 21:56:50 +00003015 if (NewVD->isFileVarDecl())
3016 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope);
3017 else
3018 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage);
Chris Lattnereaaebc72009-04-25 08:06:05 +00003019 return NewVD->setInvalidDecl();
Anders Carlsson1a7acfa2009-02-28 21:56:50 +00003020 }
Mike Stump1eb44332009-09-09 15:08:12 +00003021
Chris Lattnereaaebc72009-04-25 08:06:05 +00003022 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size);
3023 NewVD->setType(FixedTy);
Anders Carlsson1a7acfa2009-02-28 21:56:50 +00003024 }
3025
John McCall68263142009-11-18 22:49:29 +00003026 if (Previous.empty() && NewVD->isExternC()) {
Douglas Gregor63935192009-03-02 00:19:53 +00003027 // Since we did not find anything by this name and we're declaring
3028 // an extern "C" variable, look for a non-visible extern "C"
3029 // declaration with the same name.
3030 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00003031 = LocallyScopedExternalDecls.find(NewVD->getDeclName());
Douglas Gregor63935192009-03-02 00:19:53 +00003032 if (Pos != LocallyScopedExternalDecls.end())
John McCall68263142009-11-18 22:49:29 +00003033 Previous.addDecl(Pos->second);
Douglas Gregor63935192009-03-02 00:19:53 +00003034 }
3035
Chris Lattnereaaebc72009-04-25 08:06:05 +00003036 if (T->isVoidType() && !NewVD->hasExternalStorage()) {
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00003037 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type)
3038 << T;
Chris Lattnereaaebc72009-04-25 08:06:05 +00003039 return NewVD->setInvalidDecl();
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00003040 }
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00003041
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00003042 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) {
Mike Stumpea000bf2009-04-30 00:19:40 +00003043 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal);
3044 return NewVD->setInvalidDecl();
3045 }
Mike Stump1eb44332009-09-09 15:08:12 +00003046
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00003047 if (isVM && NewVD->hasAttr<BlocksAttr>()) {
Mike Stumpc975bb02009-05-01 23:41:47 +00003048 Diag(NewVD->getLocation(), diag::err_block_on_vm);
3049 return NewVD->setInvalidDecl();
3050 }
3051
Sebastian Redlf9ea1f32010-07-12 23:11:43 +00003052 // Function pointers and references cannot have qualified function type, only
3053 // function pointer-to-members can do that.
3054 QualType Pointee;
3055 unsigned PtrOrRef = 0;
3056 if (const PointerType *Ptr = T->getAs<PointerType>())
3057 Pointee = Ptr->getPointeeType();
3058 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) {
3059 Pointee = Ref->getPointeeType();
3060 PtrOrRef = 1;
3061 }
3062 if (!Pointee.isNull() && Pointee->isFunctionProtoType() &&
3063 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) {
3064 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer)
3065 << PtrOrRef;
3066 return NewVD->setInvalidDecl();
3067 }
3068
John McCall68263142009-11-18 22:49:29 +00003069 if (!Previous.empty()) {
Douglas Gregorcda9c672009-02-16 17:45:42 +00003070 Redeclaration = true;
John McCall68263142009-11-18 22:49:29 +00003071 MergeVarDecl(NewVD, Previous);
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00003072 }
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00003073}
3074
Douglas Gregora8f32e02009-10-06 17:59:45 +00003075/// \brief Data used with FindOverriddenMethod
3076struct FindOverriddenMethodData {
3077 Sema *S;
3078 CXXMethodDecl *Method;
3079};
3080
3081/// \brief Member lookup function that determines whether a given C++
3082/// method overrides a method in a base class, to be used with
3083/// CXXRecordDecl::lookupInBases().
John McCallaf8e6ed2009-11-12 03:15:40 +00003084static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier,
Douglas Gregora8f32e02009-10-06 17:59:45 +00003085 CXXBasePath &Path,
3086 void *UserData) {
3087 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl();
Anders Carlsson95496802009-11-26 20:50:40 +00003088
Douglas Gregora8f32e02009-10-06 17:59:45 +00003089 FindOverriddenMethodData *Data
3090 = reinterpret_cast<FindOverriddenMethodData*>(UserData);
Anders Carlsson95496802009-11-26 20:50:40 +00003091
3092 DeclarationName Name = Data->Method->getDeclName();
3093
3094 // FIXME: Do we care about other names here too?
3095 if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
John McCallad00b772010-06-16 08:42:20 +00003096 // We really want to find the base class destructor here.
Anders Carlsson95496802009-11-26 20:50:40 +00003097 QualType T = Data->S->Context.getTypeDeclType(BaseRecord);
3098 CanQualType CT = Data->S->Context.getCanonicalType(T);
3099
Anders Carlsson1a689722009-11-27 01:26:58 +00003100 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT);
Anders Carlsson95496802009-11-26 20:50:40 +00003101 }
3102
3103 for (Path.Decls = BaseRecord->lookup(Name);
Douglas Gregora8f32e02009-10-06 17:59:45 +00003104 Path.Decls.first != Path.Decls.second;
3105 ++Path.Decls.first) {
John McCall52a02752010-06-16 09:33:39 +00003106 NamedDecl *D = *Path.Decls.first;
John McCallad00b772010-06-16 08:42:20 +00003107 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) {
3108 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false))
Douglas Gregora8f32e02009-10-06 17:59:45 +00003109 return true;
3110 }
3111 }
3112
3113 return false;
3114}
3115
Sebastian Redla165da02009-11-18 21:51:29 +00003116/// AddOverriddenMethods - See if a method overrides any in the base classes,
3117/// and if so, check that it's a valid override and remember it.
3118void Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) {
3119 // Look for virtual methods in base classes that this method might override.
3120 CXXBasePaths Paths;
3121 FindOverriddenMethodData Data;
3122 Data.Method = MD;
3123 Data.S = this;
3124 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) {
3125 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(),
3126 E = Paths.found_decls_end(); I != E; ++I) {
3127 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) {
3128 if (!CheckOverridingFunctionReturnType(MD, OldMD) &&
Sean Huntbbd37c62009-11-21 08:43:09 +00003129 !CheckOverridingFunctionExceptionSpec(MD, OldMD) &&
3130 !CheckOverridingFunctionAttributes(MD, OldMD))
Anders Carlsson3aaf4862009-12-04 05:51:56 +00003131 MD->addOverriddenMethod(OldMD->getCanonicalDecl());
Sebastian Redla165da02009-11-18 21:51:29 +00003132 }
3133 }
3134 }
3135}
3136
Mike Stump1eb44332009-09-09 15:08:12 +00003137NamedDecl*
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003138Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC,
John McCalla93c9342009-12-07 02:54:59 +00003139 QualType R, TypeSourceInfo *TInfo,
John McCall68263142009-11-18 22:49:29 +00003140 LookupResult &Previous,
Douglas Gregore542c862009-06-23 23:11:28 +00003141 MultiTemplateParamsArg TemplateParamLists,
Chris Lattnereaaebc72009-04-25 08:06:05 +00003142 bool IsFunctionDefinition, bool &Redeclaration) {
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003143 assert(R.getTypePtr()->isFunctionType());
3144
Abramo Bagnara25777432010-08-11 22:01:17 +00003145 // TODO: consider using NameInfo for diagnostic.
3146 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
3147 DeclarationName Name = NameInfo.getName();
John McCalld931b082010-08-26 03:08:43 +00003148 FunctionDecl::StorageClass SC = SC_None;
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003149 switch (D.getDeclSpec().getStorageClassSpec()) {
3150 default: assert(0 && "Unknown storage class!");
3151 case DeclSpec::SCS_auto:
3152 case DeclSpec::SCS_register:
3153 case DeclSpec::SCS_mutable:
Mike Stump1eb44332009-09-09 15:08:12 +00003154 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
Douglas Gregor04495c82009-02-24 01:23:02 +00003155 diag::err_typecheck_sclass_func);
Chris Lattnereaaebc72009-04-25 08:06:05 +00003156 D.setInvalidType();
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003157 break;
John McCalld931b082010-08-26 03:08:43 +00003158 case DeclSpec::SCS_unspecified: SC = SC_None; break;
3159 case DeclSpec::SCS_extern: SC = SC_Extern; break;
Douglas Gregor04495c82009-02-24 01:23:02 +00003160 case DeclSpec::SCS_static: {
Sebastian Redl7a126a42010-08-31 00:36:30 +00003161 if (CurContext->getRedeclContext()->isFunctionOrMethod()) {
Douglas Gregor04495c82009-02-24 01:23:02 +00003162 // C99 6.7.1p5:
3163 // The declaration of an identifier for a function that has
3164 // block scope shall have no explicit storage-class specifier
3165 // other than extern
3166 // See also (C++ [dcl.stc]p4).
Mike Stump1eb44332009-09-09 15:08:12 +00003167 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
Douglas Gregor04495c82009-02-24 01:23:02 +00003168 diag::err_static_block_func);
John McCalld931b082010-08-26 03:08:43 +00003169 SC = SC_None;
Douglas Gregor04495c82009-02-24 01:23:02 +00003170 } else
John McCalld931b082010-08-26 03:08:43 +00003171 SC = SC_Static;
Douglas Gregor04495c82009-02-24 01:23:02 +00003172 break;
3173 }
John McCalld931b082010-08-26 03:08:43 +00003174 case DeclSpec::SCS_private_extern: SC = SC_PrivateExtern;break;
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003175 }
3176
Eli Friedman63054b32009-04-19 20:27:55 +00003177 if (D.getDeclSpec().isThreadSpecified())
3178 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
3179
John McCall3f9a8a62009-08-11 06:59:38 +00003180 bool isFriend = D.getDeclSpec().isFriendSpecified();
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003181 bool isInline = D.getDeclSpec().isInlineSpecified();
Douglas Gregor021c3b32009-03-11 23:00:04 +00003182 bool isVirtual = D.getDeclSpec().isVirtualSpecified();
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003183 bool isExplicit = D.getDeclSpec().isExplicitSpecified();
3184
Douglas Gregor16573fa2010-04-19 22:54:31 +00003185 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten();
3186 FunctionDecl::StorageClass SCAsWritten
Abramo Bagnara35f9a192010-07-30 16:47:02 +00003187 = StorageClassSpecToFunctionDeclStorageClass(SCSpec);
Douglas Gregor16573fa2010-04-19 22:54:31 +00003188
Anders Carlsson4681ebd2009-03-22 20:18:17 +00003189 // Check that the return type is not an abstract class type.
Anders Carlsson8211eff2009-03-24 01:19:16 +00003190 // For record types, this is done by the AbstractClassUsageDiagnoser once
Mike Stump1eb44332009-09-09 15:08:12 +00003191 // the class has been completely parsed.
Anders Carlsson8211eff2009-03-24 01:19:16 +00003192 if (!DC->isRecord() &&
Mike Stump1eb44332009-09-09 15:08:12 +00003193 RequireNonAbstractType(D.getIdentifierLoc(),
John McCall183700f2009-09-21 23:43:11 +00003194 R->getAs<FunctionType>()->getResultType(),
Mike Stump1eb44332009-09-09 15:08:12 +00003195 diag::err_abstract_type_in_decl,
Anders Carlsson8211eff2009-03-24 01:19:16 +00003196 AbstractReturnType))
Chris Lattnereaaebc72009-04-25 08:06:05 +00003197 D.setInvalidType();
Mike Stump1eb44332009-09-09 15:08:12 +00003198
Chris Lattnerbb749822009-04-11 19:17:25 +00003199 // Do not allow returning a objc interface by-value.
John McCallc12c5bb2010-05-15 11:32:37 +00003200 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) {
Chris Lattnerbb749822009-04-11 19:17:25 +00003201 Diag(D.getIdentifierLoc(),
3202 diag::err_object_cannot_be_passed_returned_by_value) << 0
John McCall183700f2009-09-21 23:43:11 +00003203 << R->getAs<FunctionType>()->getResultType();
Chris Lattnereaaebc72009-04-25 08:06:05 +00003204 D.setInvalidType();
Chris Lattnerbb749822009-04-11 19:17:25 +00003205 }
Douglas Gregore542c862009-06-23 23:11:28 +00003206
Douglas Gregor021c3b32009-03-11 23:00:04 +00003207 bool isVirtualOkay = false;
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003208 FunctionDecl *NewFD;
John McCall02cace72009-08-28 07:59:38 +00003209
John McCall3f9a8a62009-08-11 06:59:38 +00003210 if (isFriend) {
John McCall3f9a8a62009-08-11 06:59:38 +00003211 // C++ [class.friend]p5
3212 // A function can be defined in a friend declaration of a
3213 // class . . . . Such a function is implicitly inline.
3214 isInline |= IsFunctionDefinition;
John McCall02cace72009-08-28 07:59:38 +00003215 }
John McCall3f9a8a62009-08-11 06:59:38 +00003216
Douglas Gregor3f9a0562009-11-03 01:35:08 +00003217 if (Name.getNameKind() == DeclarationName::CXXConstructorName) {
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003218 // This is a C++ constructor declaration.
3219 assert(DC->isRecord() &&
3220 "Constructors can only be declared in a member context");
3221
Chris Lattner65401802009-04-25 08:28:21 +00003222 R = CheckConstructorDeclarator(D, R, SC);
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003223
3224 // Create the new declaration
Mike Stump1eb44332009-09-09 15:08:12 +00003225 NewFD = CXXConstructorDecl::Create(Context,
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003226 cast<CXXRecordDecl>(DC),
Abramo Bagnara25777432010-08-11 22:01:17 +00003227 NameInfo, R, TInfo,
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003228 isExplicit, isInline,
3229 /*isImplicitlyDeclared=*/false);
Douglas Gregor3f9a0562009-11-03 01:35:08 +00003230 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003231 // This is a C++ destructor declaration.
3232 if (DC->isRecord()) {
Douglas Gregord92ec472010-07-01 05:10:53 +00003233 R = CheckDestructorDeclarator(D, R, SC);
Mike Stump1eb44332009-09-09 15:08:12 +00003234
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003235 NewFD = CXXDestructorDecl::Create(Context,
3236 cast<CXXRecordDecl>(DC),
Abramo Bagnara25777432010-08-11 22:01:17 +00003237 NameInfo, R,
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003238 isInline,
3239 /*isImplicitlyDeclared=*/false);
John McCall21ef0fa2010-03-11 09:03:00 +00003240 NewFD->setTypeSourceInfo(TInfo);
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003241
Douglas Gregor021c3b32009-03-11 23:00:04 +00003242 isVirtualOkay = true;
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003243 } else {
3244 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member);
3245
3246 // Create a FunctionDecl to satisfy the function definition parsing
3247 // code path.
3248 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(),
Douglas Gregor16573fa2010-04-19 22:54:31 +00003249 Name, R, TInfo, SC, SCAsWritten, isInline,
Argyrios Kyrtzidisa5d82002009-08-21 00:31:54 +00003250 /*hasPrototype=*/true);
Chris Lattnereaaebc72009-04-25 08:06:05 +00003251 D.setInvalidType();
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003252 }
Douglas Gregor3f9a0562009-11-03 01:35:08 +00003253 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) {
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003254 if (!DC->isRecord()) {
3255 Diag(D.getIdentifierLoc(),
3256 diag::err_conv_function_not_member);
3257 return 0;
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003258 }
Mike Stump1eb44332009-09-09 15:08:12 +00003259
Chris Lattner6e475012009-04-25 08:35:12 +00003260 CheckConversionDeclarator(D, R, SC);
3261 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC),
Abramo Bagnara25777432010-08-11 22:01:17 +00003262 NameInfo, R, TInfo,
Chris Lattner6e475012009-04-25 08:35:12 +00003263 isInline, isExplicit);
Mike Stump1eb44332009-09-09 15:08:12 +00003264
Chris Lattner6e475012009-04-25 08:35:12 +00003265 isVirtualOkay = true;
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003266 } else if (DC->isRecord()) {
Anders Carlsson4649cac2009-04-30 22:41:11 +00003267 // If the of the function is the same as the name of the record, then this
Mike Stump1eb44332009-09-09 15:08:12 +00003268 // must be an invalid constructor that has a return type.
3269 // (The parser checks for a return type and makes the declarator a
Anders Carlsson4649cac2009-04-30 22:41:11 +00003270 // constructor if it has no return type).
Mike Stump1eb44332009-09-09 15:08:12 +00003271 // must have an invalid constructor that has a return type
Douglas Gregor6f7a17b2010-02-05 06:12:42 +00003272 if (Name.getAsIdentifierInfo() &&
3273 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){
Anders Carlsson4649cac2009-04-30 22:41:11 +00003274 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type)
3275 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
3276 << SourceRange(D.getIdentifierLoc());
3277 return 0;
3278 }
Mike Stump1eb44332009-09-09 15:08:12 +00003279
John McCalld931b082010-08-26 03:08:43 +00003280 bool isStatic = SC == SC_Static;
Anders Carlsson67bf2e72009-11-15 18:59:32 +00003281
3282 // [class.free]p1:
3283 // Any allocation function for a class T is a static member
3284 // (even if not explicitly declared static).
3285 if (Name.getCXXOverloadedOperator() == OO_New ||
3286 Name.getCXXOverloadedOperator() == OO_Array_New)
3287 isStatic = true;
Anders Carlsson1f126bd2009-11-15 19:08:46 +00003288
3289 // [class.free]p6 Any deallocation function for a class X is a static member
3290 // (even if not explicitly declared static).
3291 if (Name.getCXXOverloadedOperator() == OO_Delete ||
3292 Name.getCXXOverloadedOperator() == OO_Array_Delete)
3293 isStatic = true;
Anders Carlsson67bf2e72009-11-15 18:59:32 +00003294
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003295 // This is a C++ method declaration.
3296 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC),
Abramo Bagnara25777432010-08-11 22:01:17 +00003297 NameInfo, R, TInfo,
Douglas Gregor16573fa2010-04-19 22:54:31 +00003298 isStatic, SCAsWritten, isInline);
Douglas Gregor021c3b32009-03-11 23:00:04 +00003299
Anders Carlsson1f126bd2009-11-15 19:08:46 +00003300 isVirtualOkay = !isStatic;
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003301 } else {
Douglas Gregord874def2009-03-19 18:33:54 +00003302 // Determine whether the function was written with a
3303 // prototype. This true when:
3304 // - we're in C++ (where every function has a prototype),
3305 // - there is a prototype in the declarator, or
3306 // - the type R of the function is some kind of typedef or other reference
3307 // to a type name (which eventually refers to a function type).
Mike Stump1eb44332009-09-09 15:08:12 +00003308 bool HasPrototype =
Chris Lattner0d48bf92009-03-17 23:17:04 +00003309 getLangOptions().CPlusPlus ||
Douglas Gregor13d7a322009-03-19 18:14:46 +00003310 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) ||
Douglas Gregord1659a62009-03-23 16:26:51 +00003311 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType());
Mike Stump1eb44332009-09-09 15:08:12 +00003312
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003313 NewFD = FunctionDecl::Create(Context, DC,
Abramo Bagnara25777432010-08-11 22:01:17 +00003314 NameInfo, R, TInfo, SC, SCAsWritten, isInline,
Douglas Gregor16573fa2010-04-19 22:54:31 +00003315 HasPrototype);
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003316 }
3317
Chris Lattnereaaebc72009-04-25 08:06:05 +00003318 if (D.isInvalidType())
Chris Lattner584be452009-04-25 05:44:12 +00003319 NewFD->setInvalidDecl();
Mike Stump1eb44332009-09-09 15:08:12 +00003320
John McCallb6217662010-03-15 10:12:16 +00003321 SetNestedNameSpecifier(NewFD, D);
3322
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003323 // Set the lexical context. If the declarator has a C++
John McCall02cace72009-08-28 07:59:38 +00003324 // scope specifier, or is the object of a friend declaration, the
3325 // lexical context will be different from the semantic context.
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003326 NewFD->setLexicalDeclContext(CurContext);
3327
Douglas Gregorf59a56e2009-07-21 23:53:31 +00003328 // Match up the template parameter lists with the scope specifier, then
3329 // determine whether we have a template or a template specialization.
Douglas Gregorc5c903a2009-06-24 00:23:40 +00003330 FunctionTemplateDecl *FunctionTemplate = 0;
Douglas Gregor1fef4e62009-10-07 22:35:40 +00003331 bool isExplicitSpecialization = false;
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00003332 bool isFunctionTemplateSpecialization = false;
Abramo Bagnara9b934882010-06-12 08:15:14 +00003333 unsigned NumMatchedTemplateParamLists = TemplateParamLists.size();
Douglas Gregor0167f3c2010-07-14 23:14:12 +00003334 bool Invalid = false;
Douglas Gregorf59a56e2009-07-21 23:53:31 +00003335 if (TemplateParameterList *TemplateParams
3336 = MatchTemplateParametersToScopeSpecifier(
3337 D.getDeclSpec().getSourceRange().getBegin(),
3338 D.getCXXScopeSpec(),
Douglas Gregor27eeb5e2009-07-22 22:05:02 +00003339 (TemplateParameterList**)TemplateParamLists.get(),
Douglas Gregor1fef4e62009-10-07 22:35:40 +00003340 TemplateParamLists.size(),
John McCall77e8b112010-04-13 20:37:33 +00003341 isFriend,
Douglas Gregor0167f3c2010-07-14 23:14:12 +00003342 isExplicitSpecialization,
3343 Invalid)) {
Abramo Bagnara9b934882010-06-12 08:15:14 +00003344 // All but one template parameter lists have been matching.
3345 --NumMatchedTemplateParamLists;
3346
Douglas Gregorc5c903a2009-06-24 00:23:40 +00003347 if (TemplateParams->size() > 0) {
3348 // This is a function template
Mike Stump1eb44332009-09-09 15:08:12 +00003349
Douglas Gregor05396e22009-08-25 17:23:04 +00003350 // Check that we can declare a template here.
3351 if (CheckTemplateDeclScope(S, TemplateParams))
3352 return 0;
Mike Stump1eb44332009-09-09 15:08:12 +00003353
Douglas Gregord60e1052009-08-27 16:57:43 +00003354 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC,
Douglas Gregorc5c903a2009-06-24 00:23:40 +00003355 NewFD->getLocation(),
3356 Name, TemplateParams,
3357 NewFD);
Douglas Gregord60e1052009-08-27 16:57:43 +00003358 FunctionTemplate->setLexicalDeclContext(CurContext);
Douglas Gregorc5c903a2009-06-24 00:23:40 +00003359 NewFD->setDescribedFunctionTemplate(FunctionTemplate);
3360 } else {
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00003361 // This is a function template specialization.
3362 isFunctionTemplateSpecialization = true;
John McCall7ad650f2010-03-24 07:46:06 +00003363
John McCallaf2094e2010-04-08 09:05:18 +00003364 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);".
John McCall7ad650f2010-03-24 07:46:06 +00003365 if (isFriend && isFunctionTemplateSpecialization) {
John McCall5fd378b2010-03-24 08:27:58 +00003366 // We want to remove the "template<>", found here.
3367 SourceRange RemoveRange = TemplateParams->getSourceRange();
3368
3369 // If we remove the template<> and the name is not a
3370 // template-id, we're actually silently creating a problem:
3371 // the friend declaration will refer to an untemplated decl,
3372 // and clearly the user wants a template specialization. So
3373 // we need to insert '<>' after the name.
3374 SourceLocation InsertLoc;
3375 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) {
3376 InsertLoc = D.getName().getSourceRange().getEnd();
3377 InsertLoc = PP.getLocForEndOfToken(InsertLoc);
3378 }
3379
John McCall7ad650f2010-03-24 07:46:06 +00003380 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend)
John McCall5fd378b2010-03-24 08:27:58 +00003381 << Name << RemoveRange
Douglas Gregor849b2432010-03-31 17:46:05 +00003382 << FixItHint::CreateRemoval(RemoveRange)
3383 << FixItHint::CreateInsertion(InsertLoc, "<>");
John McCall7ad650f2010-03-24 07:46:06 +00003384 }
Douglas Gregorc5c903a2009-06-24 00:23:40 +00003385 }
Mike Stump1eb44332009-09-09 15:08:12 +00003386 }
Abramo Bagnara9b934882010-06-12 08:15:14 +00003387
Douglas Gregor98c2e622010-07-28 23:59:57 +00003388 if (NumMatchedTemplateParamLists > 0 && D.getCXXScopeSpec().isSet()) {
Douglas Gregorc722ea42010-06-15 17:44:38 +00003389 NewFD->setTemplateParameterListsInfo(Context,
3390 NumMatchedTemplateParamLists,
Abramo Bagnara9b934882010-06-12 08:15:14 +00003391 (TemplateParameterList**)TemplateParamLists.release());
3392 }
3393
Douglas Gregor0167f3c2010-07-14 23:14:12 +00003394 if (Invalid) {
3395 NewFD->setInvalidDecl();
3396 if (FunctionTemplate)
3397 FunctionTemplate->setInvalidDecl();
3398 }
3399
Douglas Gregor021c3b32009-03-11 23:00:04 +00003400 // C++ [dcl.fct.spec]p5:
3401 // The virtual specifier shall only be used in declarations of
3402 // nonstatic class member functions that appear within a
3403 // member-specification of a class declaration; see 10.3.
3404 //
Chris Lattnereaaebc72009-04-25 08:06:05 +00003405 if (isVirtual && !NewFD->isInvalidDecl()) {
Douglas Gregor021c3b32009-03-11 23:00:04 +00003406 if (!isVirtualOkay) {
Mike Stump1eb44332009-09-09 15:08:12 +00003407 Diag(D.getDeclSpec().getVirtualSpecLoc(),
Douglas Gregor021c3b32009-03-11 23:00:04 +00003408 diag::err_virtual_non_function);
3409 } else if (!CurContext->isRecord()) {
3410 // 'virtual' was specified outside of the class.
3411 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class)
Douglas Gregor849b2432010-03-31 17:46:05 +00003412 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc());
Douglas Gregor021c3b32009-03-11 23:00:04 +00003413 } else {
3414 // Okay: Add virtual to the method.
Douglas Gregor021c3b32009-03-11 23:00:04 +00003415 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC);
Fariborz Jahaniane7184df2009-12-03 18:44:40 +00003416 CurClass->setMethodAsVirtual(NewFD);
Douglas Gregor021c3b32009-03-11 23:00:04 +00003417 }
3418 }
3419
Douglas Gregored328c62010-08-06 11:44:10 +00003420 // C++ [dcl.fct.spec]p3:
3421 // The inline specifier shall not appear on a block scope function declaration.
3422 if (isInline && !NewFD->isInvalidDecl() && getLangOptions().CPlusPlus) {
3423 if (CurContext->isFunctionOrMethod()) {
3424 // 'inline' is not allowed on block scope function declaration.
3425 Diag(D.getDeclSpec().getInlineSpecLoc(),
3426 diag::err_inline_declaration_block_scope) << Name
3427 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc());
3428 }
3429 }
3430
Anders Carlsson0757c8c2010-01-24 16:49:46 +00003431 // C++ [dcl.fct.spec]p6:
3432 // The explicit specifier shall be used only in the declaration of a
3433 // constructor or conversion function within its class definition; see 12.3.1
3434 // and 12.3.2.
3435 if (isExplicit && !NewFD->isInvalidDecl()) {
3436 if (!CurContext->isRecord()) {
3437 // 'explicit' was specified outside of the class.
3438 Diag(D.getDeclSpec().getExplicitSpecLoc(),
3439 diag::err_explicit_out_of_class)
Douglas Gregor849b2432010-03-31 17:46:05 +00003440 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc());
Anders Carlsson0757c8c2010-01-24 16:49:46 +00003441 } else if (!isa<CXXConstructorDecl>(NewFD) &&
3442 !isa<CXXConversionDecl>(NewFD)) {
3443 // 'explicit' was specified on a function that wasn't a constructor
3444 // or conversion function.
3445 Diag(D.getDeclSpec().getExplicitSpecLoc(),
3446 diag::err_explicit_non_ctor_or_conv_function)
Douglas Gregor849b2432010-03-31 17:46:05 +00003447 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc());
Anders Carlsson0757c8c2010-01-24 16:49:46 +00003448 }
3449 }
3450
John McCall68263142009-11-18 22:49:29 +00003451 // Filter out previous declarations that don't match the scope.
3452 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage());
3453
Douglas Gregora735b202009-10-13 14:39:41 +00003454 if (isFriend) {
John McCall68263142009-11-18 22:49:29 +00003455 // DC is the namespace in which the function is being declared.
3456 assert((DC->isFileContext() || !Previous.empty()) &&
3457 "previously-undeclared friend function being created "
3458 "in a non-namespace context");
3459
John McCallb0cb0222010-03-27 05:57:59 +00003460 // For now, claim that the objects have no previous declaration.
Douglas Gregora735b202009-10-13 14:39:41 +00003461 if (FunctionTemplate) {
John McCallb0cb0222010-03-27 05:57:59 +00003462 FunctionTemplate->setObjectOfFriendDecl(false);
Douglas Gregora735b202009-10-13 14:39:41 +00003463 FunctionTemplate->setAccess(AS_public);
3464 }
John McCall77e8b112010-04-13 20:37:33 +00003465 NewFD->setObjectOfFriendDecl(false);
Douglas Gregora735b202009-10-13 14:39:41 +00003466 NewFD->setAccess(AS_public);
3467 }
3468
John McCalld931b082010-08-26 03:08:43 +00003469 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) &&
Douglas Gregor656de632009-03-11 23:52:16 +00003470 !CurContext->isRecord()) {
3471 // C++ [class.static]p1:
3472 // A data or function member of a class may be declared static
3473 // in a class definition, in which case it is a static member of
3474 // the class.
3475
3476 // Complain about the 'static' specifier if it's on an out-of-line
3477 // member function definition.
Mike Stump1eb44332009-09-09 15:08:12 +00003478 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
Douglas Gregor656de632009-03-11 23:52:16 +00003479 diag::err_static_out_of_line)
Douglas Gregor849b2432010-03-31 17:46:05 +00003480 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
Douglas Gregor656de632009-03-11 23:52:16 +00003481 }
3482
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003483 // Handle GNU asm-label extension (encoded as an attribute).
3484 if (Expr *E = (Expr*) D.getAsmLabel()) {
3485 // The parser guarantees this is a string.
Mike Stump1eb44332009-09-09 15:08:12 +00003486 StringLiteral *SE = cast<StringLiteral>(E);
Sean Huntcf807c42010-08-18 23:23:40 +00003487 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context,
3488 SE->getString()));
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003489 }
3490
Chris Lattner2dbd2852009-04-25 06:12:16 +00003491 // Copy the parameter declarations from the declarator D to the function
3492 // declaration NewFD, if they are available. First scavenge them into Params.
3493 llvm::SmallVector<ParmVarDecl*, 16> Params;
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003494 if (D.getNumTypeObjects() > 0) {
3495 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun;
3496
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003497 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs
3498 // function that takes no arguments, not a function that takes a
3499 // single void argument.
3500 // We let through "const void" here because Sema::GetTypeForDeclarator
3501 // already checks for that case.
3502 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 &&
3503 FTI.ArgInfo[0].Param &&
John McCalld226f652010-08-21 09:40:31 +00003504 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) {
Chris Lattner2dbd2852009-04-25 06:12:16 +00003505 // Empty arg list, don't push any params.
John McCalld226f652010-08-21 09:40:31 +00003506 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param);
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003507
3508 // In C++, the empty parameter-type-list must be spelled "void"; a
3509 // typedef of void is not permitted.
3510 if (getLangOptions().CPlusPlus &&
Chris Lattner584be452009-04-25 05:44:12 +00003511 Param->getType().getUnqualifiedType() != Context.VoidTy)
Douglas Gregora3a83512009-04-01 23:51:29 +00003512 Diag(Param->getLocation(), diag::err_param_typedef_of_void);
Chris Lattner2dbd2852009-04-25 06:12:16 +00003513 // FIXME: Leaks decl?
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003514 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) {
Argyrios Kyrtzidis9bedef62009-07-14 03:18:53 +00003515 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) {
John McCalld226f652010-08-21 09:40:31 +00003516 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param);
Argyrios Kyrtzidis9bedef62009-07-14 03:18:53 +00003517 assert(Param->getDeclContext() != NewFD && "Was set before ?");
3518 Param->setDeclContext(NewFD);
3519 Params.push_back(Param);
John McCallf19de1c2010-04-14 01:27:20 +00003520
3521 if (Param->isInvalidDecl())
3522 NewFD->setInvalidDecl();
Argyrios Kyrtzidis9bedef62009-07-14 03:18:53 +00003523 }
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003524 }
Mike Stump1eb44332009-09-09 15:08:12 +00003525
John McCall183700f2009-09-21 23:43:11 +00003526 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) {
Chris Lattner1ad9b282009-04-25 06:03:53 +00003527 // When we're declaring a function with a typedef, typeof, etc as in the
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003528 // following example, we'll need to synthesize (unnamed)
3529 // parameters for use in the declaration.
3530 //
3531 // @code
3532 // typedef void fn(int);
3533 // fn f;
3534 // @endcode
Mike Stump1eb44332009-09-09 15:08:12 +00003535
Chris Lattner1ad9b282009-04-25 06:03:53 +00003536 // Synthesize a parameter for each argument type.
Chris Lattner1ad9b282009-04-25 06:03:53 +00003537 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(),
3538 AE = FT->arg_type_end(); AI != AE; ++AI) {
John McCall82dc0092010-06-04 11:21:44 +00003539 ParmVarDecl *Param =
3540 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI);
Chris Lattner1ad9b282009-04-25 06:03:53 +00003541 Params.push_back(Param);
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003542 }
Chris Lattner84bb9442009-04-25 18:38:18 +00003543 } else {
3544 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 &&
3545 "Should not need args for typedef of non-prototype fn");
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003546 }
Chris Lattner2dbd2852009-04-25 06:12:16 +00003547 // Finally, we know we have the right number of parameters, install them.
Douglas Gregor838db382010-02-11 01:19:42 +00003548 NewFD->setParams(Params.data(), Params.size());
Mike Stump1eb44332009-09-09 15:08:12 +00003549
Douglas Gregor0b60d9e2009-09-25 23:53:26 +00003550 // If the declarator is a template-id, translate the parser's template
3551 // argument list into our AST format.
3552 bool HasExplicitTemplateArgs = false;
John McCalld5532b62009-11-23 01:53:49 +00003553 TemplateArgumentListInfo TemplateArgs;
Douglas Gregor3f9a0562009-11-03 01:35:08 +00003554 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) {
3555 TemplateIdAnnotation *TemplateId = D.getName().TemplateId;
John McCalld5532b62009-11-23 01:53:49 +00003556 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc);
3557 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc);
Douglas Gregor0b60d9e2009-09-25 23:53:26 +00003558 ASTTemplateArgsPtr TemplateArgsPtr(*this,
3559 TemplateId->getTemplateArgs(),
Douglas Gregor0b60d9e2009-09-25 23:53:26 +00003560 TemplateId->NumArgs);
3561 translateTemplateArguments(TemplateArgsPtr,
Douglas Gregor0b60d9e2009-09-25 23:53:26 +00003562 TemplateArgs);
3563 TemplateArgsPtr.release();
3564
3565 HasExplicitTemplateArgs = true;
Douglas Gregor0b60d9e2009-09-25 23:53:26 +00003566
3567 if (FunctionTemplate) {
Douglas Gregor1fef4e62009-10-07 22:35:40 +00003568 // FIXME: Diagnose function template with explicit template
Douglas Gregor0b60d9e2009-09-25 23:53:26 +00003569 // arguments.
3570 HasExplicitTemplateArgs = false;
3571 } else if (!isFunctionTemplateSpecialization &&
3572 !D.getDeclSpec().isFriendSpecified()) {
3573 // We have encountered something that the user meant to be a
3574 // specialization (because it has explicitly-specified template
3575 // arguments) but that was not introduced with a "template<>" (or had
3576 // too few of them).
3577 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header)
3578 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc)
Douglas Gregor849b2432010-03-31 17:46:05 +00003579 << FixItHint::CreateInsertion(
Douglas Gregor0b60d9e2009-09-25 23:53:26 +00003580 D.getDeclSpec().getSourceRange().getBegin(),
3581 "template<> ");
3582 isFunctionTemplateSpecialization = true;
John McCall7ad650f2010-03-24 07:46:06 +00003583 } else {
3584 // "friend void foo<>(int);" is an implicit specialization decl.
3585 isFunctionTemplateSpecialization = true;
Douglas Gregor0b60d9e2009-09-25 23:53:26 +00003586 }
John McCallaf2094e2010-04-08 09:05:18 +00003587 } else if (isFriend && isFunctionTemplateSpecialization) {
3588 // This combination is only possible in a recovery case; the user
3589 // wrote something like:
3590 // template <> friend void foo(int);
3591 // which we're recovering from as if the user had written:
3592 // friend void foo<>(int);
3593 // Go ahead and fake up a template id.
3594 HasExplicitTemplateArgs = true;
3595 TemplateArgs.setLAngleLoc(D.getIdentifierLoc());
3596 TemplateArgs.setRAngleLoc(D.getIdentifierLoc());
Douglas Gregor0b60d9e2009-09-25 23:53:26 +00003597 }
John McCall68263142009-11-18 22:49:29 +00003598
John McCallaf2094e2010-04-08 09:05:18 +00003599 // If it's a friend (and only if it's a friend), it's possible
3600 // that either the specialized function type or the specialized
3601 // template is dependent, and therefore matching will fail. In
3602 // this case, don't check the specialization yet.
3603 if (isFunctionTemplateSpecialization && isFriend &&
3604 (NewFD->getType()->isDependentType() || DC->isDependentContext())) {
3605 assert(HasExplicitTemplateArgs &&
3606 "friend function specialization without template args");
3607 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs,
3608 Previous))
Douglas Gregor036ada22010-03-24 17:31:23 +00003609 NewFD->setInvalidDecl();
John McCallaf2094e2010-04-08 09:05:18 +00003610 } else if (isFunctionTemplateSpecialization) {
3611 if (CheckFunctionTemplateSpecialization(NewFD,
3612 (HasExplicitTemplateArgs ? &TemplateArgs : 0),
3613 Previous))
3614 NewFD->setInvalidDecl();
3615 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) {
3616 if (CheckMemberSpecialization(NewFD, Previous))
3617 NewFD->setInvalidDecl();
3618 }
John McCallba9d8532010-04-13 06:39:49 +00003619
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003620 // Perform semantic checking on the function declaration.
3621 bool OverloadableAttrRequired = false; // FIXME: HACK!
John McCall9f54ad42009-12-10 09:41:52 +00003622 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization,
Douglas Gregorfd056bc2009-10-13 16:30:37 +00003623 Redeclaration, /*FIXME:*/OverloadableAttrRequired);
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003624
John McCall68263142009-11-18 22:49:29 +00003625 assert((NewFD->isInvalidDecl() || !Redeclaration ||
3626 Previous.getResultKind() != LookupResult::FoundOverloaded) &&
3627 "previous declaration set still overloaded");
3628
John McCall76d32642010-04-24 01:30:58 +00003629 NamedDecl *PrincipalDecl = (FunctionTemplate
3630 ? cast<NamedDecl>(FunctionTemplate)
3631 : NewFD);
3632
John McCallb0cb0222010-03-27 05:57:59 +00003633 if (isFriend && Redeclaration) {
John McCallba9d8532010-04-13 06:39:49 +00003634 AccessSpecifier Access = AS_public;
3635 if (!NewFD->isInvalidDecl())
3636 Access = NewFD->getPreviousDeclaration()->getAccess();
3637
John McCallb0cb0222010-03-27 05:57:59 +00003638 NewFD->setAccess(Access);
John McCall76d32642010-04-24 01:30:58 +00003639 if (FunctionTemplate) FunctionTemplate->setAccess(Access);
3640
3641 PrincipalDecl->setObjectOfFriendDecl(true);
John McCallb0cb0222010-03-27 05:57:59 +00003642 }
3643
John McCall76d32642010-04-24 01:30:58 +00003644 if (NewFD->isOverloadedOperator() && !DC->isRecord() &&
3645 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary))
3646 PrincipalDecl->setNonMemberOperator();
3647
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00003648 // If we have a function template, check the template parameter
3649 // list. This will check and merge default template arguments.
3650 if (FunctionTemplate) {
3651 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration();
3652 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(),
3653 PrevTemplate? PrevTemplate->getTemplateParameters() : 0,
3654 D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate
3655 : TPC_FunctionTemplate);
3656 }
3657
Chris Lattnereaaebc72009-04-25 08:06:05 +00003658 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) {
John McCall46460a62010-01-20 21:53:11 +00003659 // Fake up an access specifier if it's supposed to be a class member.
John McCall86ff3082010-02-04 22:26:26 +00003660 if (!Redeclaration && isa<CXXRecordDecl>(NewFD->getDeclContext()))
John McCall46460a62010-01-20 21:53:11 +00003661 NewFD->setAccess(AS_public);
3662
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003663 // An out-of-line member function declaration must also be a
3664 // definition (C++ [dcl.meaning]p1).
Douglas Gregor741fab62009-10-08 15:54:21 +00003665 // Note that this is not the case for explicit specializations of
3666 // function templates or member functions of class templates, per
Chandler Carruthb21fc4a2010-07-16 04:32:28 +00003667 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension
3668 // for compatibility with old SWIG code which likes to generate them.
Douglas Gregord85cef52009-09-17 19:51:30 +00003669 if (!IsFunctionDefinition && !isFriend &&
Douglas Gregor37d681852009-10-12 22:27:17 +00003670 !isFunctionTemplateSpecialization && !isExplicitSpecialization) {
Chandler Carruthb21fc4a2010-07-16 04:32:28 +00003671 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration)
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003672 << D.getCXXScopeSpec().getRange();
Chandler Carruthb21fc4a2010-07-16 04:32:28 +00003673 }
3674 if (!Redeclaration && !(isFriend && CurContext->isDependentContext())) {
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003675 // The user tried to provide an out-of-line definition for a
3676 // function that is a member of a class or namespace, but there
Mike Stump1eb44332009-09-09 15:08:12 +00003677 // was no such member function declared (C++ [class.mfct]p2,
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003678 // C++ [namespace.memdef]p2). For example:
Mike Stump1eb44332009-09-09 15:08:12 +00003679 //
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003680 // class X {
3681 // void f() const;
Mike Stump1eb44332009-09-09 15:08:12 +00003682 // };
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003683 //
3684 // void X::f() { } // ill-formed
3685 //
3686 // Complain about this problem, and attempt to suggest close
3687 // matches (e.g., those that differ only in cv-qualifiers and
3688 // whether the parameter types are references).
3689 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match)
Douglas Gregor3f093272009-10-13 21:16:44 +00003690 << Name << DC << D.getCXXScopeSpec().getRange();
Chris Lattnereaaebc72009-04-25 08:06:05 +00003691 NewFD->setInvalidDecl();
Mike Stump1eb44332009-09-09 15:08:12 +00003692
John McCalla24dc2e2009-11-17 02:14:36 +00003693 LookupResult Prev(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName,
John McCall7d384dd2009-11-18 07:57:50 +00003694 ForRedeclaration);
John McCalla24dc2e2009-11-17 02:14:36 +00003695 LookupQualifiedName(Prev, DC);
Mike Stump1eb44332009-09-09 15:08:12 +00003696 assert(!Prev.isAmbiguous() &&
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003697 "Cannot have an ambiguity in previous-declaration lookup");
3698 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end();
3699 Func != FuncEnd; ++Func) {
3700 if (isa<FunctionDecl>(*Func) &&
3701 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD))
3702 Diag((*Func)->getLocation(), diag::note_member_def_close_match);
3703 }
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003704 }
3705 }
3706
3707 // Handle attributes. We need to have merged decls when handling attributes
3708 // (for example to check for conflicts, etc).
3709 // FIXME: This needs to happen before we merge declarations. Then,
3710 // let attribute merging cope with attribute conflicts.
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00003711 ProcessDeclAttributes(S, NewFD, D);
Ryan Flynn478fbc62009-07-25 22:29:44 +00003712
3713 // attributes declared post-definition are currently ignored
Sean Huntcf807c42010-08-18 23:23:40 +00003714 // FIXME: This should happen during attribute merging
John McCall68263142009-11-18 22:49:29 +00003715 if (Redeclaration && Previous.isSingleResult()) {
3716 const FunctionDecl *Def;
3717 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl());
Argyrios Kyrtzidis06a54a32010-07-07 11:31:19 +00003718 if (PrevFD && PrevFD->hasBody(Def) && D.hasAttributes()) {
Ryan Flynn478fbc62009-07-25 22:29:44 +00003719 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition);
3720 Diag(Def->getLocation(), diag::note_previous_definition);
3721 }
3722 }
3723
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003724 AddKnownFunctionAttributes(NewFD);
3725
Sean Huntcf807c42010-08-18 23:23:40 +00003726 if (OverloadableAttrRequired && !NewFD->hasAttr<OverloadableAttr>()) {
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003727 // If a function name is overloadable in C, then every function
3728 // with that name must be marked "overloadable".
3729 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing)
3730 << Redeclaration << NewFD;
John McCall68263142009-11-18 22:49:29 +00003731 if (!Previous.empty())
3732 Diag(Previous.getRepresentativeDecl()->getLocation(),
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003733 diag::note_attribute_overloadable_prev_overload);
Sean Huntcf807c42010-08-18 23:23:40 +00003734 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), Context));
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003735 }
3736
Douglas Gregord9455382010-08-06 13:50:58 +00003737 if (NewFD->hasAttr<OverloadableAttr>() &&
3738 !NewFD->getType()->getAs<FunctionProtoType>()) {
3739 Diag(NewFD->getLocation(),
3740 diag::err_attribute_overloadable_no_prototype)
3741 << NewFD;
3742
3743 // Turn this into a variadic function with no parameters.
3744 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>();
3745 QualType R = Context.getFunctionType(FT->getResultType(),
3746 0, 0, true, 0, false, false, 0, 0,
3747 FT->getExtInfo());
3748 NewFD->setType(R);
3749 }
3750
Eli Friedmanaa8b0d12010-08-05 06:57:20 +00003751 // If there's a #pragma GCC visibility in scope, and this isn't a class
3752 // member, set the visibility of this function.
3753 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord())
3754 AddPushedVisibilityAttribute(NewFD);
3755
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003756 // If this is a locally-scoped extern C function, update the
3757 // map of such names.
Douglas Gregor48a83b52009-09-12 00:17:51 +00003758 if (CurContext->isFunctionOrMethod() && NewFD->isExternC()
Chris Lattnereaaebc72009-04-25 08:06:05 +00003759 && !NewFD->isInvalidDecl())
John McCall68263142009-11-18 22:49:29 +00003760 RegisterLocallyScopedExternCDecl(NewFD, Previous, S);
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003761
Argyrios Kyrtzidis16f19302009-06-25 18:22:24 +00003762 // Set this FunctionDecl's range up to the right paren.
3763 NewFD->setLocEnd(D.getSourceRange().getEnd());
3764
Douglas Gregore53060f2009-06-25 22:08:12 +00003765 if (FunctionTemplate && NewFD->isInvalidDecl())
3766 FunctionTemplate->setInvalidDecl();
Mike Stump1eb44332009-09-09 15:08:12 +00003767
Douglas Gregore53060f2009-06-25 22:08:12 +00003768 if (FunctionTemplate)
3769 return FunctionTemplate;
Mike Stump1eb44332009-09-09 15:08:12 +00003770
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00003771 MarkUnusedFileScopedDecl(NewFD);
Argyrios Kyrtzidis49b96d12010-08-13 18:42:17 +00003772
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003773 return NewFD;
3774}
3775
3776/// \brief Perform semantic checking of a new function declaration.
3777///
3778/// Performs semantic analysis of the new function declaration
3779/// NewFD. This routine performs all semantic checking that does not
3780/// require the actual declarator involved in the declaration, and is
3781/// used both for the declaration of functions as they are parsed
3782/// (called via ActOnDeclarator) and for the declaration of functions
3783/// that have been instantiated via C++ template instantiation (called
3784/// via InstantiateDecl).
3785///
Douglas Gregorfd056bc2009-10-13 16:30:37 +00003786/// \param IsExplicitSpecialiation whether this new function declaration is
3787/// an explicit specialization of the previous declaration.
3788///
Chris Lattnereaaebc72009-04-25 08:06:05 +00003789/// This sets NewFD->isInvalidDecl() to true if there was an error.
John McCall9f54ad42009-12-10 09:41:52 +00003790void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD,
John McCall68263142009-11-18 22:49:29 +00003791 LookupResult &Previous,
Douglas Gregorfd056bc2009-10-13 16:30:37 +00003792 bool IsExplicitSpecialization,
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003793 bool &Redeclaration,
3794 bool &OverloadableAttrRequired) {
Chris Lattnereaaebc72009-04-25 08:06:05 +00003795 // If NewFD is already known erroneous, don't do any of this checking.
John McCallfcadea22010-08-12 00:57:17 +00003796 if (NewFD->isInvalidDecl()) {
3797 // If this is a class member, mark the class invalid immediately.
3798 // This avoids some consistency errors later.
3799 if (isa<CXXMethodDecl>(NewFD))
3800 cast<CXXMethodDecl>(NewFD)->getParent()->setInvalidDecl();
3801
Chris Lattnereaaebc72009-04-25 08:06:05 +00003802 return;
John McCallfcadea22010-08-12 00:57:17 +00003803 }
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003804
Eli Friedman88f7b572009-05-16 12:15:55 +00003805 if (NewFD->getResultType()->isVariablyModifiedType()) {
3806 // Functions returning a variably modified type violate C99 6.7.5.2p2
3807 // because all functions have linkage.
3808 Diag(NewFD->getLocation(), diag::err_vm_func_decl);
3809 return NewFD->setInvalidDecl();
3810 }
3811
Douglas Gregor48a83b52009-09-12 00:17:51 +00003812 if (NewFD->isMain())
3813 CheckMain(NewFD);
John McCall8c4859a2009-07-24 03:03:21 +00003814
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003815 // Check for a previous declaration of this name.
John McCall68263142009-11-18 22:49:29 +00003816 if (Previous.empty() && NewFD->isExternC()) {
Douglas Gregor63935192009-03-02 00:19:53 +00003817 // Since we did not find anything by this name and we're declaring
3818 // an extern "C" function, look for a non-visible extern "C"
3819 // declaration with the same name.
3820 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003821 = LocallyScopedExternalDecls.find(NewFD->getDeclName());
Douglas Gregor63935192009-03-02 00:19:53 +00003822 if (Pos != LocallyScopedExternalDecls.end())
John McCall68263142009-11-18 22:49:29 +00003823 Previous.addDecl(Pos->second);
Douglas Gregor63935192009-03-02 00:19:53 +00003824 }
3825
Douglas Gregor04495c82009-02-24 01:23:02 +00003826 // Merge or overload the declaration with an existing declaration of
3827 // the same name, if appropriate.
John McCall68263142009-11-18 22:49:29 +00003828 if (!Previous.empty()) {
Douglas Gregorf9201e02009-02-11 23:02:49 +00003829 // Determine whether NewFD is an overload of PrevDecl or
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003830 // a declaration that requires merging. If it's an overload,
3831 // there's no more work to do here; we'll just add the new
3832 // function to the scope.
Douglas Gregorae170942009-02-13 00:26:38 +00003833
John McCall68263142009-11-18 22:49:29 +00003834 NamedDecl *OldDecl = 0;
John McCall871b2e72009-12-09 03:35:25 +00003835 if (!AllowOverloadingOfFunction(Previous, Context)) {
3836 Redeclaration = true;
3837 OldDecl = Previous.getFoundDecl();
3838 } else {
Douglas Gregord9455382010-08-06 13:50:58 +00003839 if (!getLangOptions().CPlusPlus)
John McCall871b2e72009-12-09 03:35:25 +00003840 OverloadableAttrRequired = true;
3841
John McCallad00b772010-06-16 08:42:20 +00003842 switch (CheckOverload(S, NewFD, Previous, OldDecl,
3843 /*NewIsUsingDecl*/ false)) {
John McCall871b2e72009-12-09 03:35:25 +00003844 case Ovl_Match:
John McCall9f54ad42009-12-10 09:41:52 +00003845 Redeclaration = true;
John McCall871b2e72009-12-09 03:35:25 +00003846 break;
3847
3848 case Ovl_NonFunction:
3849 Redeclaration = true;
3850 break;
3851
3852 case Ovl_Overload:
3853 Redeclaration = false;
3854 break;
John McCall68263142009-11-18 22:49:29 +00003855 }
3856 }
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003857
John McCall68263142009-11-18 22:49:29 +00003858 if (Redeclaration) {
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003859 // NewFD and OldDecl represent declarations that need to be
Mike Stump1eb44332009-09-09 15:08:12 +00003860 // merged.
Douglas Gregorcda9c672009-02-16 17:45:42 +00003861 if (MergeFunctionDecl(NewFD, OldDecl))
Chris Lattnereaaebc72009-04-25 08:06:05 +00003862 return NewFD->setInvalidDecl();
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003863
John McCall68263142009-11-18 22:49:29 +00003864 Previous.clear();
3865 Previous.addDecl(OldDecl);
3866
Douglas Gregore53060f2009-06-25 22:08:12 +00003867 if (FunctionTemplateDecl *OldTemplateDecl
Douglas Gregor37d681852009-10-12 22:27:17 +00003868 = dyn_cast<FunctionTemplateDecl>(OldDecl)) {
Douglas Gregorfd056bc2009-10-13 16:30:37 +00003869 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl());
Douglas Gregor37d681852009-10-12 22:27:17 +00003870 FunctionTemplateDecl *NewTemplateDecl
3871 = NewFD->getDescribedFunctionTemplate();
3872 assert(NewTemplateDecl && "Template/non-template mismatch");
3873 if (CXXMethodDecl *Method
3874 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) {
3875 Method->setAccess(OldTemplateDecl->getAccess());
3876 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess());
3877 }
Douglas Gregorfd056bc2009-10-13 16:30:37 +00003878
3879 // If this is an explicit specialization of a member that is a function
3880 // template, mark it as a member specialization.
3881 if (IsExplicitSpecialization &&
3882 NewTemplateDecl->getInstantiatedFromMemberTemplate()) {
3883 NewTemplateDecl->setMemberSpecialization();
3884 assert(OldTemplateDecl->isMemberSpecialization());
3885 }
Douglas Gregor37d681852009-10-12 22:27:17 +00003886 } else {
Argyrios Kyrtzidis9bedef62009-07-14 03:18:53 +00003887 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions
3888 NewFD->setAccess(OldDecl->getAccess());
Douglas Gregore53060f2009-06-25 22:08:12 +00003889 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl));
Argyrios Kyrtzidis9bedef62009-07-14 03:18:53 +00003890 }
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003891 }
Douglas Gregor4ce205f2009-02-06 17:46:57 +00003892 }
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003893
Anders Carlsson2c59d3c2009-09-13 21:33:06 +00003894 // Semantic checking for this function declaration (in isolation).
3895 if (getLangOptions().CPlusPlus) {
3896 // C++-specific checks.
3897 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) {
3898 CheckConstructor(Constructor);
Anders Carlsson6d701392009-11-15 22:49:34 +00003899 } else if (CXXDestructorDecl *Destructor =
3900 dyn_cast<CXXDestructorDecl>(NewFD)) {
3901 CXXRecordDecl *Record = Destructor->getParent();
Anders Carlsson2c59d3c2009-09-13 21:33:06 +00003902 QualType ClassType = Context.getTypeDeclType(Record);
Anders Carlsson6d701392009-11-15 22:49:34 +00003903
Douglas Gregor4923aa22010-07-02 20:37:36 +00003904 // FIXME: Shouldn't we be able to perform this check even when the class
Anders Carlsson6d701392009-11-15 22:49:34 +00003905 // type is dependent? Both gcc and edg can handle that.
Anders Carlsson2c59d3c2009-09-13 21:33:06 +00003906 if (!ClassType->isDependentType()) {
3907 DeclarationName Name
3908 = Context.DeclarationNames.getCXXDestructorName(
3909 Context.getCanonicalType(ClassType));
Abramo Bagnara25777432010-08-11 22:01:17 +00003910// NewFD->getDeclName().dump();
3911// Name.dump();
Anders Carlsson2c59d3c2009-09-13 21:33:06 +00003912 if (NewFD->getDeclName() != Name) {
3913 Diag(NewFD->getLocation(), diag::err_destructor_name);
3914 return NewFD->setInvalidDecl();
3915 }
3916 }
Anders Carlsson6d701392009-11-15 22:49:34 +00003917
Anders Carlsson2c59d3c2009-09-13 21:33:06 +00003918 Record->setUserDeclaredDestructor(true);
3919 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no
3920 // user-defined destructor.
3921 Record->setPOD(false);
3922
3923 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly-
3924 // declared destructor.
3925 // FIXME: C++0x: don't do this for "= default" destructors
3926 Record->setHasTrivialDestructor(false);
3927 } else if (CXXConversionDecl *Conversion
Douglas Gregor4ba31362009-12-01 17:24:26 +00003928 = dyn_cast<CXXConversionDecl>(NewFD)) {
Anders Carlsson2c59d3c2009-09-13 21:33:06 +00003929 ActOnConversionDeclarator(Conversion);
Douglas Gregor4ba31362009-12-01 17:24:26 +00003930 }
3931
3932 // Find any virtual functions that this function overrides.
Douglas Gregore6342c02009-12-01 17:35:23 +00003933 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) {
3934 if (!Method->isFunctionTemplateSpecialization() &&
3935 !Method->getDescribedFunctionTemplate())
3936 AddOverriddenMethods(Method->getParent(), Method);
3937 }
Anders Carlsson2c59d3c2009-09-13 21:33:06 +00003938
3939 // Extra checking for C++ overloaded operators (C++ [over.oper]).
3940 if (NewFD->isOverloadedOperator() &&
3941 CheckOverloadedOperatorDeclaration(NewFD))
3942 return NewFD->setInvalidDecl();
Sean Hunta6c058d2010-01-13 09:01:02 +00003943
3944 // Extra checking for C++0x literal operators (C++0x [over.literal]).
3945 if (NewFD->getLiteralIdentifier() &&
3946 CheckLiteralOperatorDeclaration(NewFD))
3947 return NewFD->setInvalidDecl();
3948
Anders Carlsson2c59d3c2009-09-13 21:33:06 +00003949 // In C++, check default arguments now that we have merged decls. Unless
3950 // the lexical context is the class, because in this case this is done
3951 // during delayed parsing anyway.
3952 if (!CurContext->isRecord())
3953 CheckCXXDefaultArguments(NewFD);
3954 }
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003955}
3956
John McCall8c4859a2009-07-24 03:03:21 +00003957void Sema::CheckMain(FunctionDecl* FD) {
John McCall13591ed2009-07-25 04:36:53 +00003958 // C++ [basic.start.main]p3: A program that declares main to be inline
3959 // or static is ill-formed.
3960 // C99 6.7.4p4: In a hosted environment, the inline function specifier
3961 // shall not appear in a declaration of main.
3962 // static main is not an error under C99, but we should warn about it.
Douglas Gregor0130f3c2009-10-27 21:01:01 +00003963 bool isInline = FD->isInlineSpecified();
John McCalld931b082010-08-26 03:08:43 +00003964 bool isStatic = FD->getStorageClass() == SC_Static;
John McCall13591ed2009-07-25 04:36:53 +00003965 if (isInline || isStatic) {
3966 unsigned diagID = diag::warn_unusual_main_decl;
3967 if (isInline || getLangOptions().CPlusPlus)
3968 diagID = diag::err_unusual_main_decl;
3969
3970 int which = isStatic + (isInline << 1) - 1;
3971 Diag(FD->getLocation(), diagID) << which;
3972 }
3973
3974 QualType T = FD->getType();
3975 assert(T->isFunctionType() && "function decl is not of function type");
John McCall183700f2009-09-21 23:43:11 +00003976 const FunctionType* FT = T->getAs<FunctionType>();
Mike Stump1eb44332009-09-09 15:08:12 +00003977
John McCall13591ed2009-07-25 04:36:53 +00003978 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) {
3979 // TODO: add a replacement fixit to turn the return type into 'int'.
3980 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint);
3981 FD->setInvalidDecl(true);
3982 }
3983
3984 // Treat protoless main() as nullary.
3985 if (isa<FunctionNoProtoType>(FT)) return;
3986
3987 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT);
3988 unsigned nparams = FTP->getNumArgs();
3989 assert(FD->getNumParams() == nparams);
3990
John McCall66755862009-12-24 09:58:38 +00003991 bool HasExtraParameters = (nparams > 3);
3992
3993 // Darwin passes an undocumented fourth argument of type char**. If
3994 // other platforms start sprouting these, the logic below will start
3995 // getting shifty.
3996 if (nparams == 4 &&
3997 Context.Target.getTriple().getOS() == llvm::Triple::Darwin)
3998 HasExtraParameters = false;
3999
4000 if (HasExtraParameters) {
John McCall13591ed2009-07-25 04:36:53 +00004001 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams;
4002 FD->setInvalidDecl(true);
4003 nparams = 3;
4004 }
4005
4006 // FIXME: a lot of the following diagnostics would be improved
4007 // if we had some location information about types.
4008
4009 QualType CharPP =
4010 Context.getPointerType(Context.getPointerType(Context.CharTy));
John McCall66755862009-12-24 09:58:38 +00004011 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP };
John McCall13591ed2009-07-25 04:36:53 +00004012
4013 for (unsigned i = 0; i < nparams; ++i) {
4014 QualType AT = FTP->getArgType(i);
4015
4016 bool mismatch = true;
4017
4018 if (Context.hasSameUnqualifiedType(AT, Expected[i]))
4019 mismatch = false;
4020 else if (Expected[i] == CharPP) {
4021 // As an extension, the following forms are okay:
4022 // char const **
4023 // char const * const *
4024 // char * const *
4025
John McCall0953e762009-09-24 19:53:00 +00004026 QualifierCollector qs;
John McCall13591ed2009-07-25 04:36:53 +00004027 const PointerType* PT;
Ted Kremenek6217b802009-07-29 21:53:49 +00004028 if ((PT = qs.strip(AT)->getAs<PointerType>()) &&
4029 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) &&
John McCall13591ed2009-07-25 04:36:53 +00004030 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) {
4031 qs.removeConst();
4032 mismatch = !qs.empty();
4033 }
4034 }
4035
4036 if (mismatch) {
4037 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i];
4038 // TODO: suggest replacing given type with expected type
4039 FD->setInvalidDecl(true);
4040 }
4041 }
4042
4043 if (nparams == 1 && !FD->isInvalidDecl()) {
4044 Diag(FD->getLocation(), diag::warn_main_one_arg);
4045 }
John McCall8c4859a2009-07-24 03:03:21 +00004046}
4047
Eli Friedmanc594b322008-05-20 13:48:25 +00004048bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) {
Eli Friedman3b8a36a2009-02-27 04:17:12 +00004049 // FIXME: Need strict checking. In C89, we need to check for
4050 // any assignment, increment, decrement, function-calls, or
4051 // commas outside of a sizeof. In C99, it's the same list,
4052 // except that the aforementioned are allowed in unevaluated
4053 // expressions. Everything else falls under the
4054 // "may accept other forms of constant expressions" exception.
4055 // (We never end up here for C++, so the constant expression
4056 // rules there don't matter.)
John McCall4204f072010-08-02 21:13:48 +00004057 if (Init->isConstantInitializer(Context, false))
Eli Friedman578a9722009-02-22 06:45:27 +00004058 return false;
Eli Friedman21298282009-02-26 04:47:58 +00004059 Diag(Init->getExprLoc(), diag::err_init_element_not_constant)
4060 << Init->getSourceRange();
Eli Friedmanc594b322008-05-20 13:48:25 +00004061 return true;
Steve Naroffd0091aa2008-01-10 22:15:12 +00004062}
4063
John McCall9ae2f072010-08-23 23:25:46 +00004064void Sema::AddInitializerToDecl(Decl *dcl, Expr *init) {
4065 AddInitializerToDecl(dcl, init, /*DirectInit=*/false);
Douglas Gregor09f41cf2009-01-14 15:45:31 +00004066}
4067
4068/// AddInitializerToDecl - Adds the initializer Init to the
4069/// declaration dcl. If DirectInit is true, this is C++ direct
4070/// initialization rather than copy initialization.
John McCall9ae2f072010-08-23 23:25:46 +00004071void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, bool DirectInit) {
Chris Lattner9a11b9a2007-10-19 20:10:30 +00004072 // If there is no declaration, there was an error parsing it. Just ignore
4073 // the initializer.
Eli Friedman3b8a36a2009-02-27 04:17:12 +00004074 if (RealDecl == 0)
Chris Lattner9a11b9a2007-10-19 20:10:30 +00004075 return;
Mike Stump1eb44332009-09-09 15:08:12 +00004076
Douglas Gregor021c3b32009-03-11 23:00:04 +00004077 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) {
4078 // With declarators parsed the way they are, the parser cannot
4079 // distinguish between a normal initializer and a pure-specifier.
4080 // Thus this grotesque test.
4081 IntegerLiteral *IL;
Douglas Gregor021c3b32009-03-11 23:00:04 +00004082 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 &&
Douglas Gregor4ba31362009-12-01 17:24:26 +00004083 Context.getCanonicalType(IL->getType()) == Context.IntTy)
4084 CheckPureMethod(Method, Init->getSourceRange());
4085 else {
Douglas Gregor021c3b32009-03-11 23:00:04 +00004086 Diag(Method->getLocation(), diag::err_member_function_initialization)
4087 << Method->getDeclName() << Init->getSourceRange();
4088 Method->setInvalidDecl();
4089 }
4090 return;
4091 }
4092
Steve Naroff410e3e22007-09-12 20:13:48 +00004093 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl);
4094 if (!VDecl) {
Douglas Gregor021c3b32009-03-11 23:00:04 +00004095 if (getLangOptions().CPlusPlus &&
4096 RealDecl->getLexicalDeclContext()->isRecord() &&
4097 isa<NamedDecl>(RealDecl))
4098 Diag(RealDecl->getLocation(), diag::err_member_initialization)
4099 << cast<NamedDecl>(RealDecl)->getDeclName();
4100 else
4101 Diag(RealDecl->getLocation(), diag::err_illegal_initializer);
Steve Naroff410e3e22007-09-12 20:13:48 +00004102 RealDecl->setInvalidDecl();
4103 return;
Eli Friedman3b8a36a2009-02-27 04:17:12 +00004104 }
4105
Douglas Gregor3a91abf2010-08-24 05:27:49 +00004106
4107
Eli Friedman49e2b8e2009-11-14 03:40:14 +00004108 // A definition must end up with a complete type, which means it must be
4109 // complete with the restriction that an array type might be completed by the
4110 // initializer; note that later code assumes this restriction.
4111 QualType BaseDeclType = VDecl->getType();
4112 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType))
4113 BaseDeclType = Array->getElementType();
4114 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType,
Eli Friedmana31feca2009-04-13 21:28:54 +00004115 diag::err_typecheck_decl_incomplete_type)) {
4116 RealDecl->setInvalidDecl();
4117 return;
4118 }
4119
Douglas Gregor1ab537b2009-12-03 18:33:45 +00004120 // The variable can not have an abstract class type.
4121 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(),
4122 diag::err_abstract_type_in_decl,
4123 AbstractVariableType))
4124 VDecl->setInvalidDecl();
4125
Sebastian Redl31310a22010-02-01 20:16:42 +00004126 const VarDecl *Def;
4127 if ((Def = VDecl->getDefinition()) && Def != VDecl) {
Mike Stump1eb44332009-09-09 15:08:12 +00004128 Diag(VDecl->getLocation(), diag::err_redefinition)
Douglas Gregor275a3692009-03-10 23:43:53 +00004129 << VDecl->getDeclName();
4130 Diag(Def->getLocation(), diag::note_previous_definition);
4131 VDecl->setInvalidDecl();
4132 return;
4133 }
Douglas Gregor3a91abf2010-08-24 05:27:49 +00004134
4135 // C++ [class.static.data]p4
4136 // If a static data member is of const integral or const
4137 // enumeration type, its declaration in the class definition can
4138 // specify a constant-initializer which shall be an integral
4139 // constant expression (5.19). In that case, the member can appear
4140 // in integral constant expressions. The member shall still be
4141 // defined in a namespace scope if it is used in the program and the
4142 // namespace scope definition shall not contain an initializer.
4143 //
4144 // We already performed a redefinition check above, but for static
4145 // data members we also need to check whether there was an in-class
4146 // declaration with an initializer.
4147 const VarDecl* PrevInit = 0;
4148 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) {
4149 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName();
4150 Diag(PrevInit->getLocation(), diag::note_previous_definition);
4151 return;
4152 }
Douglas Gregor275a3692009-03-10 23:43:53 +00004153
John McCalle46f62c2010-08-01 01:24:59 +00004154 if (getLangOptions().CPlusPlus && VDecl->hasLocalStorage())
John McCall781472f2010-08-25 08:40:02 +00004155 getCurFunction()->setHasBranchProtectedScope();
John McCalle46f62c2010-08-01 01:24:59 +00004156
Douglas Gregor99a2e602009-12-16 01:38:02 +00004157 // Capture the variable that is being initialized and the style of
4158 // initialization.
4159 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl);
4160
4161 // FIXME: Poor source location information.
4162 InitializationKind Kind
4163 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(),
4164 Init->getLocStart(),
4165 Init->getLocEnd())
4166 : InitializationKind::CreateCopy(VDecl->getLocation(),
4167 Init->getLocStart());
4168
Steve Naroffbb204692007-09-12 14:07:44 +00004169 // Get the decls type and save a reference for later, since
Steve Naroffd0091aa2008-01-10 22:15:12 +00004170 // CheckInitializerTypes may change it.
Steve Naroff410e3e22007-09-12 20:13:48 +00004171 QualType DclT = VDecl->getType(), SavT = DclT;
Steve Naroff248a7532008-04-15 22:42:06 +00004172 if (VDecl->isBlockVarDecl()) {
Daniel Dunbar5466c7b2009-04-14 02:25:56 +00004173 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5
Steve Naroff410e3e22007-09-12 20:13:48 +00004174 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init);
Steve Naroff248a7532008-04-15 22:42:06 +00004175 VDecl->setInvalidDecl();
4176 } else if (!VDecl->isInvalidDecl()) {
Eli Friedmancfdc81a2009-12-19 08:11:05 +00004177 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1);
John McCall60d7b3a2010-08-24 06:29:42 +00004178 ExprResult Result = InitSeq.Perform(*this, Entity, Kind,
John McCallca0408f2010-08-23 06:44:23 +00004179 MultiExprArg(*this, &Init, 1),
Eli Friedmana91eb542009-12-22 02:10:53 +00004180 &DclT);
4181 if (Result.isInvalid()) {
Steve Naroff248a7532008-04-15 22:42:06 +00004182 VDecl->setInvalidDecl();
Eli Friedmancfdc81a2009-12-19 08:11:05 +00004183 return;
4184 }
Mike Stump1eb44332009-09-09 15:08:12 +00004185
Eli Friedmana91eb542009-12-22 02:10:53 +00004186 Init = Result.takeAs<Expr>();
4187
Anders Carlssonc5eb7312008-08-22 05:00:02 +00004188 // C++ 3.6.2p2, allow dynamic initialization of static initializers.
Eli Friedmanda153232009-02-20 01:34:21 +00004189 // Don't check invalid declarations to avoid emitting useless diagnostics.
4190 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) {
John McCalld931b082010-08-26 03:08:43 +00004191 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4.
Anders Carlssonc5eb7312008-08-22 05:00:02 +00004192 CheckForConstantInitializer(Init, DclT);
4193 }
Steve Naroffbb204692007-09-12 14:07:44 +00004194 }
Mike Stump1eb44332009-09-09 15:08:12 +00004195 } else if (VDecl->isStaticDataMember() &&
Douglas Gregor021c3b32009-03-11 23:00:04 +00004196 VDecl->getLexicalDeclContext()->isRecord()) {
4197 // This is an in-class initialization for a static data member, e.g.,
4198 //
4199 // struct S {
4200 // static const int value = 17;
4201 // };
4202
4203 // Attach the initializer
Douglas Gregor838db382010-02-11 01:19:42 +00004204 VDecl->setInit(Init);
Douglas Gregor021c3b32009-03-11 23:00:04 +00004205
4206 // C++ [class.mem]p4:
4207 // A member-declarator can contain a constant-initializer only
4208 // if it declares a static member (9.4) of const integral or
4209 // const enumeration type, see 9.4.2.
4210 QualType T = VDecl->getType();
Mike Stump1eb44332009-09-09 15:08:12 +00004211 if (!T->isDependentType() &&
Douglas Gregor021c3b32009-03-11 23:00:04 +00004212 (!Context.getCanonicalType(T).isConstQualified() ||
Douglas Gregor2ade35e2010-06-16 00:17:44 +00004213 !T->isIntegralOrEnumerationType())) {
Douglas Gregor021c3b32009-03-11 23:00:04 +00004214 Diag(VDecl->getLocation(), diag::err_member_initialization)
4215 << VDecl->getDeclName() << Init->getSourceRange();
4216 VDecl->setInvalidDecl();
4217 } else {
4218 // C++ [class.static.data]p4:
4219 // If a static data member is of const integral or const
4220 // enumeration type, its declaration in the class definition
4221 // can specify a constant-initializer which shall be an
4222 // integral constant expression (5.19).
4223 if (!Init->isTypeDependent() &&
Douglas Gregor2ade35e2010-06-16 00:17:44 +00004224 !Init->getType()->isIntegralOrEnumerationType()) {
Douglas Gregor021c3b32009-03-11 23:00:04 +00004225 // We have a non-dependent, non-integral or enumeration type.
Mike Stump1eb44332009-09-09 15:08:12 +00004226 Diag(Init->getSourceRange().getBegin(),
Douglas Gregor021c3b32009-03-11 23:00:04 +00004227 diag::err_in_class_initializer_non_integral_type)
4228 << Init->getType() << Init->getSourceRange();
4229 VDecl->setInvalidDecl();
4230 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) {
4231 // Check whether the expression is a constant expression.
4232 llvm::APSInt Value;
4233 SourceLocation Loc;
4234 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) {
4235 Diag(Loc, diag::err_in_class_initializer_non_constant)
4236 << Init->getSourceRange();
4237 VDecl->setInvalidDecl();
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00004238 } else if (!VDecl->getType()->isDependentType())
John McCall2de56d12010-08-25 11:45:40 +00004239 ImpCastExprToType(Init, VDecl->getType(), CK_IntegralCast);
Douglas Gregor021c3b32009-03-11 23:00:04 +00004240 }
4241 }
Steve Naroff248a7532008-04-15 22:42:06 +00004242 } else if (VDecl->isFileVarDecl()) {
John McCalld931b082010-08-26 03:08:43 +00004243 if (VDecl->getStorageClass() == SC_Extern &&
Douglas Gregor66dd9392010-04-22 14:36:26 +00004244 (!getLangOptions().CPlusPlus ||
4245 !Context.getBaseElementType(VDecl->getType()).isConstQualified()))
Steve Naroff410e3e22007-09-12 20:13:48 +00004246 Diag(VDecl->getLocation(), diag::warn_extern_init);
Eli Friedmana91eb542009-12-22 02:10:53 +00004247 if (!VDecl->isInvalidDecl()) {
4248 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1);
John McCall60d7b3a2010-08-24 06:29:42 +00004249 ExprResult Result = InitSeq.Perform(*this, Entity, Kind,
John McCallca0408f2010-08-23 06:44:23 +00004250 MultiExprArg(*this, &Init, 1),
Eli Friedmana91eb542009-12-22 02:10:53 +00004251 &DclT);
4252 if (Result.isInvalid()) {
Steve Naroff248a7532008-04-15 22:42:06 +00004253 VDecl->setInvalidDecl();
Eli Friedmana91eb542009-12-22 02:10:53 +00004254 return;
4255 }
4256
4257 Init = Result.takeAs<Expr>();
4258 }
Mike Stump1eb44332009-09-09 15:08:12 +00004259
Anders Carlssonc5eb7312008-08-22 05:00:02 +00004260 // C++ 3.6.2p2, allow dynamic initialization of static initializers.
Eli Friedmanda153232009-02-20 01:34:21 +00004261 // Don't check invalid declarations to avoid emitting useless diagnostics.
4262 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) {
Anders Carlssonc5eb7312008-08-22 05:00:02 +00004263 // C99 6.7.8p4. All file scoped initializers need to be constant.
4264 CheckForConstantInitializer(Init, DclT);
4265 }
Steve Naroffbb204692007-09-12 14:07:44 +00004266 }
4267 // If the type changed, it means we had an incomplete type that was
Mike Stump1eb44332009-09-09 15:08:12 +00004268 // completed by the initializer. For example:
Steve Naroffbb204692007-09-12 14:07:44 +00004269 // int ary[] = { 1, 3, 5 };
4270 // "ary" transitions from a VariableArrayType to a ConstantArrayType.
Christopher Lamb48b12392007-11-29 19:09:19 +00004271 if (!VDecl->isInvalidDecl() && (DclT != SavT)) {
Steve Naroff410e3e22007-09-12 20:13:48 +00004272 VDecl->setType(DclT);
Christopher Lamb48b12392007-11-29 19:09:19 +00004273 Init->setType(DclT);
4274 }
Mike Stump1eb44332009-09-09 15:08:12 +00004275
Anders Carlsson0ece4912009-12-15 20:51:39 +00004276 Init = MaybeCreateCXXExprWithTemporaries(Init);
Steve Naroffbb204692007-09-12 14:07:44 +00004277 // Attach the initializer to the decl.
Douglas Gregor838db382010-02-11 01:19:42 +00004278 VDecl->setInit(Init);
Douglas Gregorb6c8c8b2009-04-21 17:11:58 +00004279
Eli Friedmandd4e4852009-12-20 22:29:11 +00004280 if (getLangOptions().CPlusPlus) {
John McCall626e96e2010-08-01 20:20:59 +00004281 if (!VDecl->isInvalidDecl() &&
4282 !VDecl->getDeclContext()->isDependentContext() &&
Anders Carlsson4938f232010-09-03 01:11:38 +00004283 VDecl->hasGlobalStorage() && !VDecl->isStaticLocal() &&
John McCall4204f072010-08-02 21:13:48 +00004284 !Init->isConstantInitializer(Context,
4285 VDecl->getType()->isReferenceType()))
4286 Diag(VDecl->getLocation(), diag::warn_global_constructor)
4287 << Init->getSourceRange();
John McCall626e96e2010-08-01 20:20:59 +00004288
Eli Friedmandd4e4852009-12-20 22:29:11 +00004289 // Make sure we mark the destructor as used if necessary.
4290 QualType InitType = VDecl->getType();
Douglas Gregorbd6d6192010-01-05 19:06:31 +00004291 while (const ArrayType *Array = Context.getAsArrayType(InitType))
Eli Friedmandd4e4852009-12-20 22:29:11 +00004292 InitType = Context.getBaseElementType(Array);
John McCall68c6c9a2010-02-02 09:10:11 +00004293 if (const RecordType *Record = InitType->getAs<RecordType>())
4294 FinalizeVarWithDestructor(VDecl, Record);
Eli Friedmandd4e4852009-12-20 22:29:11 +00004295 }
4296
Steve Naroffbb204692007-09-12 14:07:44 +00004297 return;
4298}
4299
John McCall7727acf2010-03-31 02:13:20 +00004300/// ActOnInitializerError - Given that there was an error parsing an
4301/// initializer for the given declaration, try to return to some form
4302/// of sanity.
John McCalld226f652010-08-21 09:40:31 +00004303void Sema::ActOnInitializerError(Decl *D) {
John McCall7727acf2010-03-31 02:13:20 +00004304 // Our main concern here is re-establishing invariants like "a
4305 // variable's type is either dependent or complete".
John McCall7727acf2010-03-31 02:13:20 +00004306 if (!D || D->isInvalidDecl()) return;
4307
4308 VarDecl *VD = dyn_cast<VarDecl>(D);
4309 if (!VD) return;
4310
4311 QualType Ty = VD->getType();
4312 if (Ty->isDependentType()) return;
4313
4314 // Require a complete type.
4315 if (RequireCompleteType(VD->getLocation(),
4316 Context.getBaseElementType(Ty),
4317 diag::err_typecheck_decl_incomplete_type)) {
4318 VD->setInvalidDecl();
4319 return;
4320 }
4321
4322 // Require an abstract type.
4323 if (RequireNonAbstractType(VD->getLocation(), Ty,
4324 diag::err_abstract_type_in_decl,
4325 AbstractVariableType)) {
4326 VD->setInvalidDecl();
4327 return;
4328 }
4329
4330 // Don't bother complaining about constructors or destructors,
4331 // though.
4332}
4333
John McCalld226f652010-08-21 09:40:31 +00004334void Sema::ActOnUninitializedDecl(Decl *RealDecl,
Anders Carlsson6a75cd92009-07-11 00:34:39 +00004335 bool TypeContainsUndeducedAuto) {
Argyrios Kyrtzidis48c2e902008-11-07 13:01:22 +00004336 // If there is no declaration, there was an error parsing it. Just ignore it.
4337 if (RealDecl == 0)
4338 return;
4339
Douglas Gregor27c8dc02008-10-29 00:13:59 +00004340 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) {
4341 QualType Type = Var->getType();
Douglas Gregorb6c8c8b2009-04-21 17:11:58 +00004342
Anders Carlsson6a75cd92009-07-11 00:34:39 +00004343 // C++0x [dcl.spec.auto]p3
4344 if (TypeContainsUndeducedAuto) {
4345 Diag(Var->getLocation(), diag::err_auto_var_requires_init)
4346 << Var->getDeclName() << Type;
4347 Var->setInvalidDecl();
4348 return;
4349 }
Mike Stump1eb44332009-09-09 15:08:12 +00004350
Douglas Gregor60c93c92010-02-09 07:26:29 +00004351 switch (Var->isThisDeclarationADefinition()) {
4352 case VarDecl::Definition:
4353 if (!Var->isStaticDataMember() || !Var->getAnyInitializer())
4354 break;
4355
4356 // We have an out-of-line definition of a static data member
4357 // that has an in-class initializer, so we type-check this like
4358 // a declaration.
4359 //
4360 // Fall through
4361
4362 case VarDecl::DeclarationOnly:
4363 // It's only a declaration.
4364
4365 // Block scope. C99 6.7p7: If an identifier for an object is
4366 // declared with no linkage (C99 6.2.2p6), the type for the
4367 // object shall be complete.
4368 if (!Type->isDependentType() && Var->isBlockVarDecl() &&
4369 !Var->getLinkage() && !Var->isInvalidDecl() &&
4370 RequireCompleteType(Var->getLocation(), Type,
4371 diag::err_typecheck_decl_incomplete_type))
4372 Var->setInvalidDecl();
4373
4374 // Make sure that the type is not abstract.
4375 if (!Type->isDependentType() && !Var->isInvalidDecl() &&
4376 RequireNonAbstractType(Var->getLocation(), Type,
4377 diag::err_abstract_type_in_decl,
4378 AbstractVariableType))
4379 Var->setInvalidDecl();
4380 return;
4381
4382 case VarDecl::TentativeDefinition:
4383 // File scope. C99 6.9.2p2: A declaration of an identifier for an
4384 // object that has file scope without an initializer, and without a
4385 // storage-class specifier or with the storage-class specifier "static",
4386 // constitutes a tentative definition. Note: A tentative definition with
4387 // external linkage is valid (C99 6.2.2p5).
4388 if (!Var->isInvalidDecl()) {
4389 if (const IncompleteArrayType *ArrayT
4390 = Context.getAsIncompleteArrayType(Type)) {
4391 if (RequireCompleteType(Var->getLocation(),
4392 ArrayT->getElementType(),
4393 diag::err_illegal_decl_array_incomplete_type))
4394 Var->setInvalidDecl();
John McCalld931b082010-08-26 03:08:43 +00004395 } else if (Var->getStorageClass() == SC_Static) {
Douglas Gregor60c93c92010-02-09 07:26:29 +00004396 // C99 6.9.2p3: If the declaration of an identifier for an object is
4397 // a tentative definition and has internal linkage (C99 6.2.2p3), the
4398 // declared type shall not be an incomplete type.
4399 // NOTE: code such as the following
4400 // static struct s;
4401 // struct s { int a; };
4402 // is accepted by gcc. Hence here we issue a warning instead of
4403 // an error and we do not invalidate the static declaration.
4404 // NOTE: to avoid multiple warnings, only check the first declaration.
4405 if (Var->getPreviousDeclaration() == 0)
4406 RequireCompleteType(Var->getLocation(), Type,
4407 diag::ext_typecheck_decl_incomplete_type);
4408 }
4409 }
4410
4411 // Record the tentative definition; we're done.
4412 if (!Var->isInvalidDecl())
4413 TentativeDefinitions.push_back(Var);
4414 return;
4415 }
4416
4417 // Provide a specific diagnostic for uninitialized variable
4418 // definitions with incomplete array type.
4419 if (Type->isIncompleteArrayType()) {
Sebastian Redl6e824752009-11-05 19:47:47 +00004420 Diag(Var->getLocation(),
4421 diag::err_typecheck_incomplete_array_needs_initializer);
4422 Var->setInvalidDecl();
4423 return;
4424 }
4425
John McCallb567a8b2010-08-01 01:25:24 +00004426 // Provide a specific diagnostic for uninitialized variable
4427 // definitions with reference type.
4428 if (Type->isReferenceType()) {
4429 Diag(Var->getLocation(), diag::err_reference_var_requires_init)
4430 << Var->getDeclName()
4431 << SourceRange(Var->getLocation(), Var->getLocation());
4432 Var->setInvalidDecl();
4433 return;
4434 }
Douglas Gregor60c93c92010-02-09 07:26:29 +00004435
4436 // Do not attempt to type-check the default initializer for a
4437 // variable with dependent type.
4438 if (Type->isDependentType())
Douglas Gregor251b4ff2009-10-08 07:24:58 +00004439 return;
Douglas Gregor39da0b82009-09-09 23:08:42 +00004440
Douglas Gregor60c93c92010-02-09 07:26:29 +00004441 if (Var->isInvalidDecl())
4442 return;
Douglas Gregor1ab537b2009-12-03 18:33:45 +00004443
Douglas Gregor60c93c92010-02-09 07:26:29 +00004444 if (RequireCompleteType(Var->getLocation(),
4445 Context.getBaseElementType(Type),
4446 diag::err_typecheck_decl_incomplete_type)) {
4447 Var->setInvalidDecl();
4448 return;
Douglas Gregor18fe5682008-11-03 20:45:27 +00004449 }
Douglas Gregor27c8dc02008-10-29 00:13:59 +00004450
Douglas Gregor60c93c92010-02-09 07:26:29 +00004451 // The variable can not have an abstract class type.
4452 if (RequireNonAbstractType(Var->getLocation(), Type,
4453 diag::err_abstract_type_in_decl,
4454 AbstractVariableType)) {
4455 Var->setInvalidDecl();
4456 return;
4457 }
4458
Douglas Gregor516a6bc2010-03-08 02:45:10 +00004459 const RecordType *Record
4460 = Context.getBaseElementType(Type)->getAs<RecordType>();
4461 if (Record && getLangOptions().CPlusPlus && !getLangOptions().CPlusPlus0x &&
4462 cast<CXXRecordDecl>(Record->getDecl())->isPOD()) {
4463 // C++03 [dcl.init]p9:
4464 // If no initializer is specified for an object, and the
4465 // object is of (possibly cv-qualified) non-POD class type (or
4466 // array thereof), the object shall be default-initialized; if
4467 // the object is of const-qualified type, the underlying class
4468 // type shall have a user-declared default
4469 // constructor. Otherwise, if no initializer is specified for
4470 // a non- static object, the object and its subobjects, if
4471 // any, have an indeterminate initial value); if the object
4472 // or any of its subobjects are of const-qualified type, the
4473 // program is ill-formed.
4474 // FIXME: DPG thinks it is very fishy that C++0x disables this.
4475 } else {
John McCalle46f62c2010-08-01 01:24:59 +00004476 // Check for jumps past the implicit initializer. C++0x
4477 // clarifies that this applies to a "variable with automatic
4478 // storage duration", not a "local variable".
4479 if (getLangOptions().CPlusPlus && Var->hasLocalStorage())
John McCall781472f2010-08-25 08:40:02 +00004480 getCurFunction()->setHasBranchProtectedScope();
John McCalle46f62c2010-08-01 01:24:59 +00004481
Douglas Gregor516a6bc2010-03-08 02:45:10 +00004482 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var);
4483 InitializationKind Kind
4484 = InitializationKind::CreateDefault(Var->getLocation());
Douglas Gregor60c93c92010-02-09 07:26:29 +00004485
Douglas Gregor516a6bc2010-03-08 02:45:10 +00004486 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0);
John McCall60d7b3a2010-08-24 06:29:42 +00004487 ExprResult Init = InitSeq.Perform(*this, Entity, Kind,
4488 MultiExprArg(*this, 0, 0));
Douglas Gregor516a6bc2010-03-08 02:45:10 +00004489 if (Init.isInvalid())
4490 Var->setInvalidDecl();
John McCall626e96e2010-08-01 20:20:59 +00004491 else if (Init.get()) {
Douglas Gregor838db382010-02-11 01:19:42 +00004492 Var->setInit(MaybeCreateCXXExprWithTemporaries(Init.takeAs<Expr>()));
John McCall626e96e2010-08-01 20:20:59 +00004493
4494 if (getLangOptions().CPlusPlus && !Var->isInvalidDecl() &&
Anders Carlsson4938f232010-09-03 01:11:38 +00004495 Var->hasGlobalStorage() && !Var->isStaticLocal() &&
John McCall626e96e2010-08-01 20:20:59 +00004496 !Var->getDeclContext()->isDependentContext() &&
John McCall4204f072010-08-02 21:13:48 +00004497 !Var->getInit()->isConstantInitializer(Context, false))
John McCall626e96e2010-08-01 20:20:59 +00004498 Diag(Var->getLocation(), diag::warn_global_constructor);
4499 }
Douglas Gregor60c93c92010-02-09 07:26:29 +00004500 }
Douglas Gregor516a6bc2010-03-08 02:45:10 +00004501
4502 if (!Var->isInvalidDecl() && getLangOptions().CPlusPlus && Record)
4503 FinalizeVarWithDestructor(Var, Record);
Douglas Gregor27c8dc02008-10-29 00:13:59 +00004504 }
4505}
4506
John McCallb3d87482010-08-24 05:47:05 +00004507Sema::DeclGroupPtrTy
4508Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS,
4509 Decl **Group, unsigned NumDecls) {
Chris Lattner682bf922009-03-29 16:50:03 +00004510 llvm::SmallVector<Decl*, 8> Decls;
Eli Friedmanc1dc6532009-05-29 01:49:24 +00004511
4512 if (DS.isTypeSpecOwned())
John McCallb3d87482010-08-24 05:47:05 +00004513 Decls.push_back(DS.getRepAsDecl());
Eli Friedmanc1dc6532009-05-29 01:49:24 +00004514
Chris Lattner682bf922009-03-29 16:50:03 +00004515 for (unsigned i = 0; i != NumDecls; ++i)
John McCalld226f652010-08-21 09:40:31 +00004516 if (Decl *D = Group[i])
Chris Lattner682bf922009-03-29 16:50:03 +00004517 Decls.push_back(D);
Mike Stump1eb44332009-09-09 15:08:12 +00004518
Chris Lattner682bf922009-03-29 16:50:03 +00004519 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context,
Jay Foadbeaaccd2009-05-21 09:52:38 +00004520 Decls.data(), Decls.size()));
Reid Spencer5f016e22007-07-11 17:01:13 +00004521}
Steve Naroffe1223f72007-08-28 03:03:08 +00004522
Chris Lattner682bf922009-03-29 16:50:03 +00004523
Chris Lattner04421082008-04-08 04:40:51 +00004524/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator()
4525/// to introduce parameters into function prototype scope.
John McCalld226f652010-08-21 09:40:31 +00004526Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) {
Chris Lattner985abd92008-06-26 06:49:43 +00004527 const DeclSpec &DS = D.getDeclSpec();
Douglas Gregor584049d2008-12-15 23:53:10 +00004528
Chris Lattner04421082008-04-08 04:40:51 +00004529 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'.
John McCalld931b082010-08-26 03:08:43 +00004530 VarDecl::StorageClass StorageClass = SC_None;
4531 VarDecl::StorageClass StorageClassAsWritten = SC_None;
Daniel Dunbar33ad0122008-09-03 21:54:21 +00004532 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) {
John McCalld931b082010-08-26 03:08:43 +00004533 StorageClass = SC_Register;
4534 StorageClassAsWritten = SC_Register;
Daniel Dunbar33ad0122008-09-03 21:54:21 +00004535 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) {
Chris Lattner04421082008-04-08 04:40:51 +00004536 Diag(DS.getStorageClassSpecLoc(),
4537 diag::err_invalid_storage_class_in_func_decl);
Chris Lattner985abd92008-06-26 06:49:43 +00004538 D.getMutableDeclSpec().ClearStorageClassSpecs();
Chris Lattner04421082008-04-08 04:40:51 +00004539 }
Eli Friedman63054b32009-04-19 20:27:55 +00004540
4541 if (D.getDeclSpec().isThreadSpecified())
4542 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
4543
Eli Friedman85a53192009-04-07 19:37:57 +00004544 DiagnoseFunctionSpecifiers(D);
4545
Douglas Gregor6d6eb572008-05-07 04:49:29 +00004546 // Check that there are no default arguments inside the type of this
4547 // parameter (C++ only).
4548 if (getLangOptions().CPlusPlus)
4549 CheckExtraCXXDefaultArguments(D);
Mike Stump1eb44332009-09-09 15:08:12 +00004550
Douglas Gregor402abb52009-05-28 23:31:59 +00004551 TagDecl *OwnedDecl = 0;
John McCallbf1a0282010-06-04 23:28:52 +00004552 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedDecl);
4553 QualType parmDeclType = TInfo->getType();
Mike Stump1eb44332009-09-09 15:08:12 +00004554
Douglas Gregor402abb52009-05-28 23:31:59 +00004555 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) {
4556 // C++ [dcl.fct]p6:
4557 // Types shall not be defined in return or parameter types.
4558 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type)
4559 << Context.getTypeDeclType(OwnedDecl);
4560 }
4561
Chris Lattnerd84aac12010-02-22 00:40:25 +00004562 // Check for redeclaration of parameters, e.g. int foo(int x, int x);
Chris Lattner04421082008-04-08 04:40:51 +00004563 IdentifierInfo *II = D.getIdentifier();
Chris Lattnercf79b012009-01-21 02:38:50 +00004564 if (II) {
John McCall10f28732010-03-18 06:42:38 +00004565 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName,
4566 ForRedeclaration);
4567 LookupName(R, S);
4568 if (R.isSingleResult()) {
4569 NamedDecl *PrevDecl = R.getFoundDecl();
Chris Lattnercf79b012009-01-21 02:38:50 +00004570 if (PrevDecl->isTemplateParameter()) {
4571 // Maybe we will complain about the shadowed template parameter.
4572 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
4573 // Just pretend that we didn't see the previous declaration.
4574 PrevDecl = 0;
John McCalld226f652010-08-21 09:40:31 +00004575 } else if (S->isDeclScope(PrevDecl)) {
Chris Lattnercf79b012009-01-21 02:38:50 +00004576 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II;
Chris Lattnerd84aac12010-02-22 00:40:25 +00004577 Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
Chris Lattner04421082008-04-08 04:40:51 +00004578
Chris Lattnercf79b012009-01-21 02:38:50 +00004579 // Recover by removing the name
4580 II = 0;
4581 D.SetIdentifier(0, D.getIdentifierLoc());
Fariborz Jahanian9a66c302010-02-12 21:53:14 +00004582 D.setInvalidType(true);
Chris Lattnercf79b012009-01-21 02:38:50 +00004583 }
Chris Lattner04421082008-04-08 04:40:51 +00004584 }
Reid Spencer5f016e22007-07-11 17:01:13 +00004585 }
Steve Naroff6a9f3e32007-08-07 22:44:21 +00004586
John McCall7a9813c2010-01-22 00:28:27 +00004587 // Temporarily put parameter variables in the translation unit, not
4588 // the enclosing context. This prevents them from accidentally
4589 // looking like class members in C++.
Douglas Gregorcb27b0f2010-04-12 07:48:19 +00004590 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(),
4591 TInfo, parmDeclType, II,
Douglas Gregor16573fa2010-04-19 22:54:31 +00004592 D.getIdentifierLoc(),
4593 StorageClass, StorageClassAsWritten);
Mike Stump1eb44332009-09-09 15:08:12 +00004594
Chris Lattnereaaebc72009-04-25 08:06:05 +00004595 if (D.isInvalidType())
Douglas Gregorcb27b0f2010-04-12 07:48:19 +00004596 New->setInvalidDecl();
4597
Chris Lattnerf97e8fa2009-04-11 19:34:56 +00004598 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1).
4599 if (D.getCXXScopeSpec().isSet()) {
4600 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator)
4601 << D.getCXXScopeSpec().getRange();
4602 New->setInvalidDecl();
4603 }
Douglas Gregorcb27b0f2010-04-12 07:48:19 +00004604
Douglas Gregor44b43212008-12-11 16:49:14 +00004605 // Add the parameter declaration into this scope.
John McCalld226f652010-08-21 09:40:31 +00004606 S->AddDecl(New);
Argyrios Kyrtzidis87f3ff02008-04-12 00:47:19 +00004607 if (II)
Douglas Gregor44b43212008-12-11 16:49:14 +00004608 IdResolver.AddDecl(New);
Nate Begemanb7894b52008-02-17 21:20:31 +00004609
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00004610 ProcessDeclAttributes(S, New, D);
Mike Stumpea000bf2009-04-30 00:19:40 +00004611
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00004612 if (New->hasAttr<BlocksAttr>()) {
Mike Stumpea000bf2009-04-30 00:19:40 +00004613 Diag(New->getLocation(), diag::err_block_on_nonlocal);
4614 }
John McCalld226f652010-08-21 09:40:31 +00004615 return New;
Reid Spencer5f016e22007-07-11 17:01:13 +00004616}
Fariborz Jahanian306d68f2007-11-08 23:49:49 +00004617
John McCall82dc0092010-06-04 11:21:44 +00004618/// \brief Synthesizes a variable for a parameter arising from a
4619/// typedef.
4620ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC,
4621 SourceLocation Loc,
4622 QualType T) {
4623 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, 0,
4624 T, Context.getTrivialTypeSourceInfo(T, Loc),
John McCalld931b082010-08-26 03:08:43 +00004625 SC_None, SC_None, 0);
John McCall82dc0092010-06-04 11:21:44 +00004626 Param->setImplicit();
4627 return Param;
4628}
4629
John McCallfbce0e12010-08-24 09:05:15 +00004630void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param,
4631 ParmVarDecl * const *ParamEnd) {
4632 if (Diags.getDiagnosticLevel(diag::warn_unused_parameter) ==
4633 Diagnostic::Ignored)
4634 return;
4635
4636 // Don't diagnose unused-parameter errors in template instantiations; we
4637 // will already have done so in the template itself.
4638 if (!ActiveTemplateInstantiations.empty())
4639 return;
4640
4641 for (; Param != ParamEnd; ++Param) {
4642 if (!(*Param)->isUsed() && (*Param)->getDeclName() &&
4643 !(*Param)->hasAttr<UnusedAttr>()) {
4644 Diag((*Param)->getLocation(), diag::warn_unused_parameter)
4645 << (*Param)->getDeclName();
4646 }
4647 }
4648}
4649
Douglas Gregorcb27b0f2010-04-12 07:48:19 +00004650ParmVarDecl *Sema::CheckParameter(DeclContext *DC,
4651 TypeSourceInfo *TSInfo, QualType T,
4652 IdentifierInfo *Name,
4653 SourceLocation NameLoc,
Douglas Gregor16573fa2010-04-19 22:54:31 +00004654 VarDecl::StorageClass StorageClass,
4655 VarDecl::StorageClass StorageClassAsWritten) {
Douglas Gregorcb27b0f2010-04-12 07:48:19 +00004656 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, NameLoc, Name,
4657 adjustParameterType(T), TSInfo,
Douglas Gregor16573fa2010-04-19 22:54:31 +00004658 StorageClass, StorageClassAsWritten,
4659 0);
Douglas Gregorcb27b0f2010-04-12 07:48:19 +00004660
4661 // Parameters can not be abstract class types.
4662 // For record types, this is done by the AbstractClassUsageDiagnoser once
4663 // the class has been completely parsed.
4664 if (!CurContext->isRecord() &&
4665 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl,
4666 AbstractParamType))
4667 New->setInvalidDecl();
4668
4669 // Parameter declarators cannot be interface types. All ObjC objects are
4670 // passed by reference.
John McCallc12c5bb2010-05-15 11:32:37 +00004671 if (T->isObjCObjectType()) {
Douglas Gregorcb27b0f2010-04-12 07:48:19 +00004672 Diag(NameLoc,
4673 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T;
4674 New->setInvalidDecl();
4675 }
4676
4677 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage
4678 // duration shall not be qualified by an address-space qualifier."
4679 // Since all parameters have automatic store duration, they can not have
4680 // an address space.
4681 if (T.getAddressSpace() != 0) {
4682 Diag(NameLoc, diag::err_arg_with_address_space);
4683 New->setInvalidDecl();
4684 }
4685
4686 return New;
4687}
4688
Douglas Gregora3a83512009-04-01 23:51:29 +00004689void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D,
4690 SourceLocation LocAfterDecls) {
Reid Spencer5f016e22007-07-11 17:01:13 +00004691 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function &&
4692 "Not a function declarator!");
4693 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun;
Chris Lattner04421082008-04-08 04:40:51 +00004694
Reid Spencer5f016e22007-07-11 17:01:13 +00004695 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared'
4696 // for a K&R function.
4697 if (!FTI.hasPrototype) {
Douglas Gregor26103482009-04-02 03:14:12 +00004698 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) {
4699 --i;
Chris Lattner04421082008-04-08 04:40:51 +00004700 if (FTI.ArgInfo[i].Param == 0) {
Daniel Dunbar5ffe14c2009-10-18 20:26:27 +00004701 llvm::SmallString<256> Code;
4702 llvm::raw_svector_ostream(Code) << " int "
Daniel Dunbar01eb9b92009-10-18 21:17:35 +00004703 << FTI.ArgInfo[i].Ident->getName()
Daniel Dunbar5ffe14c2009-10-18 20:26:27 +00004704 << ";\n";
Chris Lattner3c73c412008-11-19 08:23:25 +00004705 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared)
Douglas Gregora3a83512009-04-01 23:51:29 +00004706 << FTI.ArgInfo[i].Ident
Douglas Gregor849b2432010-03-31 17:46:05 +00004707 << FixItHint::CreateInsertion(LocAfterDecls, Code.str());
Douglas Gregora3a83512009-04-01 23:51:29 +00004708
Reid Spencer5f016e22007-07-11 17:01:13 +00004709 // Implicitly declare the argument as type 'int' for lack of a better
4710 // type.
Chris Lattner04421082008-04-08 04:40:51 +00004711 DeclSpec DS;
4712 const char* PrevSpec; // unused
John McCallfec54012009-08-03 20:12:06 +00004713 unsigned DiagID; // unused
Mike Stump1eb44332009-09-09 15:08:12 +00004714 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc,
John McCallfec54012009-08-03 20:12:06 +00004715 PrevSpec, DiagID);
Chris Lattner04421082008-04-08 04:40:51 +00004716 Declarator ParamD(DS, Declarator::KNRTypeListContext);
4717 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc);
Douglas Gregorbe109b32009-01-23 16:23:13 +00004718 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD);
Reid Spencer5f016e22007-07-11 17:01:13 +00004719 }
4720 }
Mike Stump1eb44332009-09-09 15:08:12 +00004721 }
Douglas Gregorbe109b32009-01-23 16:23:13 +00004722}
4723
John McCalld226f652010-08-21 09:40:31 +00004724Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope,
4725 Declarator &D) {
Douglas Gregorbe109b32009-01-23 16:23:13 +00004726 assert(getCurFunctionDecl() == 0 && "Function parsing confused");
4727 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function &&
4728 "Not a function declarator!");
4729 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun;
4730
4731 if (FTI.hasPrototype) {
Mike Stump1eb44332009-09-09 15:08:12 +00004732 // FIXME: Diagnose arguments without names in C.
Reid Spencer5f016e22007-07-11 17:01:13 +00004733 }
Mike Stump1eb44332009-09-09 15:08:12 +00004734
Douglas Gregor584049d2008-12-15 23:53:10 +00004735 Scope *ParentScope = FnBodyScope->getParent();
Steve Naroffadbbd0c2008-01-14 20:51:29 +00004736
John McCalld226f652010-08-21 09:40:31 +00004737 Decl *DP = HandleDeclarator(ParentScope, D,
4738 MultiTemplateParamsArg(*this),
4739 /*IsFunctionDefinition=*/true);
Chris Lattner682bf922009-03-29 16:50:03 +00004740 return ActOnStartOfFunctionDef(FnBodyScope, DP);
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +00004741}
4742
Anders Carlsson9f89dd72009-12-09 03:30:09 +00004743static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) {
4744 // Don't warn about invalid declarations.
4745 if (FD->isInvalidDecl())
4746 return false;
Anders Carlsson63fb6732009-12-09 03:44:46 +00004747
Anders Carlsson9f89dd72009-12-09 03:30:09 +00004748 // Or declarations that aren't global.
4749 if (!FD->isGlobal())
4750 return false;
Anders Carlsson63fb6732009-12-09 03:44:46 +00004751
Anders Carlsson9f89dd72009-12-09 03:30:09 +00004752 // Don't warn about C++ member functions.
4753 if (isa<CXXMethodDecl>(FD))
4754 return false;
Anders Carlsson63fb6732009-12-09 03:44:46 +00004755
Anders Carlsson9f89dd72009-12-09 03:30:09 +00004756 // Don't warn about 'main'.
4757 if (FD->isMain())
4758 return false;
Anders Carlsson63fb6732009-12-09 03:44:46 +00004759
Anders Carlsson9f89dd72009-12-09 03:30:09 +00004760 // Don't warn about inline functions.
4761 if (FD->isInlineSpecified())
4762 return false;
Anders Carlsson63fb6732009-12-09 03:44:46 +00004763
4764 // Don't warn about function templates.
4765 if (FD->getDescribedFunctionTemplate())
4766 return false;
4767
4768 // Don't warn about function template specializations.
4769 if (FD->isFunctionTemplateSpecialization())
4770 return false;
4771
Anders Carlsson9f89dd72009-12-09 03:30:09 +00004772 bool MissingPrototype = true;
4773 for (const FunctionDecl *Prev = FD->getPreviousDeclaration();
4774 Prev; Prev = Prev->getPreviousDeclaration()) {
4775 // Ignore any declarations that occur in function or method
4776 // scope, because they aren't visible from the header.
4777 if (Prev->getDeclContext()->isFunctionOrMethod())
4778 continue;
4779
4780 MissingPrototype = !Prev->getType()->isFunctionProtoType();
4781 break;
4782 }
4783
4784 return MissingPrototype;
4785}
4786
John McCalld226f652010-08-21 09:40:31 +00004787Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) {
Anders Carlsson0ebb6d32009-10-29 15:46:07 +00004788 // Clear the last template instantiation error context.
4789 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation();
4790
Douglas Gregor52591bf2009-06-24 00:54:41 +00004791 if (!D)
4792 return D;
Douglas Gregord83d0402009-08-22 00:34:47 +00004793 FunctionDecl *FD = 0;
Mike Stump1eb44332009-09-09 15:08:12 +00004794
John McCalld226f652010-08-21 09:40:31 +00004795 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D))
Douglas Gregord83d0402009-08-22 00:34:47 +00004796 FD = FunTmpl->getTemplatedDecl();
4797 else
John McCalld226f652010-08-21 09:40:31 +00004798 FD = cast<FunctionDecl>(D);
Douglas Gregor6fc17ff2008-10-29 15:10:40 +00004799
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00004800 // Enter a new function scope
4801 PushFunctionScope();
Mike Stump1eb44332009-09-09 15:08:12 +00004802
Douglas Gregor6fc17ff2008-10-29 15:10:40 +00004803 // See if this is a redefinition.
Charles Davisf3f8d2a2010-02-18 02:00:42 +00004804 // But don't complain if we're in GNU89 mode and the previous definition
4805 // was an extern inline function.
Douglas Gregor6fc17ff2008-10-29 15:10:40 +00004806 const FunctionDecl *Definition;
Argyrios Kyrtzidis06a54a32010-07-07 11:31:19 +00004807 if (FD->hasBody(Definition) &&
Charles Davisf3f8d2a2010-02-18 02:00:42 +00004808 !canRedefineFunction(Definition, getLangOptions())) {
Chris Lattner08631c52008-11-23 21:45:46 +00004809 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName();
Chris Lattner5f4a6822008-11-23 23:12:31 +00004810 Diag(Definition->getLocation(), diag::note_previous_definition);
Douglas Gregor6fc17ff2008-10-29 15:10:40 +00004811 }
4812
Douglas Gregorcda9c672009-02-16 17:45:42 +00004813 // Builtin functions cannot be defined.
Douglas Gregor7814e6d2009-09-12 00:22:50 +00004814 if (unsigned BuiltinID = FD->getBuiltinID()) {
Douglas Gregor655753a2009-02-17 16:03:01 +00004815 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) {
Douglas Gregorcda9c672009-02-16 17:45:42 +00004816 Diag(FD->getLocation(), diag::err_builtin_definition) << FD;
Douglas Gregor655753a2009-02-17 16:03:01 +00004817 FD->setInvalidDecl();
4818 }
Douglas Gregorcda9c672009-02-16 17:45:42 +00004819 }
4820
Eli Friedman7f0f5dc2009-03-04 07:30:59 +00004821 // The return type of a function definition must be complete
Douglas Gregore7450f52009-03-24 19:52:54 +00004822 // (C99 6.9.1p3, C++ [dcl.fct]p6).
4823 QualType ResultType = FD->getResultType();
4824 if (!ResultType->isDependentType() && !ResultType->isVoidType() &&
Chris Lattner65e6a092009-04-29 05:12:23 +00004825 !FD->isInvalidDecl() &&
Douglas Gregore7450f52009-03-24 19:52:54 +00004826 RequireCompleteType(FD->getLocation(), ResultType,
4827 diag::err_func_def_incomplete_result))
Eli Friedman7f0f5dc2009-03-04 07:30:59 +00004828 FD->setInvalidDecl();
Eli Friedman7f0f5dc2009-03-04 07:30:59 +00004829
Douglas Gregor8499f3f2009-03-31 16:35:03 +00004830 // GNU warning -Wmissing-prototypes:
4831 // Warn if a global function is defined without a previous
4832 // prototype declaration. This warning is issued even if the
4833 // definition itself provides a prototype. The aim is to detect
4834 // global functions that fail to be declared in header files.
Anders Carlsson9f89dd72009-12-09 03:30:09 +00004835 if (ShouldWarnAboutMissingPrototype(FD))
4836 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD;
Douglas Gregor8499f3f2009-03-31 16:35:03 +00004837
Douglas Gregore2c31ff2009-05-15 17:59:04 +00004838 if (FnBodyScope)
4839 PushDeclContext(FnBodyScope, FD);
Anton Korobeynikov2f402702008-12-26 00:52:02 +00004840
Chris Lattner04421082008-04-08 04:40:51 +00004841 // Check the validity of our function parameters
4842 CheckParmsForFunctionDef(FD);
4843
John McCall053f4bd2010-03-22 09:20:08 +00004844 bool ShouldCheckShadow =
4845 Diags.getDiagnosticLevel(diag::warn_decl_shadow) != Diagnostic::Ignored;
4846
Chris Lattner04421082008-04-08 04:40:51 +00004847 // Introduce our parameters into the function scope
4848 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) {
4849 ParmVarDecl *Param = FD->getParamDecl(p);
Douglas Gregora8cc8ce2009-01-09 18:51:29 +00004850 Param->setOwningFunction(FD);
4851
Chris Lattner04421082008-04-08 04:40:51 +00004852 // If this has an identifier, add it to the scope stack.
John McCall053f4bd2010-03-22 09:20:08 +00004853 if (Param->getIdentifier() && FnBodyScope) {
4854 if (ShouldCheckShadow)
4855 CheckShadow(FnBodyScope, Param);
4856
Argyrios Kyrtzidis87f3ff02008-04-12 00:47:19 +00004857 PushOnScopeChains(Param, FnBodyScope);
John McCall053f4bd2010-03-22 09:20:08 +00004858 }
Reid Spencer5f016e22007-07-11 17:01:13 +00004859 }
Chris Lattner04421082008-04-08 04:40:51 +00004860
Anton Korobeynikov2f402702008-12-26 00:52:02 +00004861 // Checking attributes of current function definition
4862 // dllimport attribute.
Sean Huntcf807c42010-08-18 23:23:40 +00004863 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>();
4864 if (DA && (!FD->getAttr<DLLExportAttr>())) {
4865 // dllimport attribute cannot be directly applied to definition.
4866 if (!DA->isInherited()) {
Anton Korobeynikov2f402702008-12-26 00:52:02 +00004867 Diag(FD->getLocation(),
4868 diag::err_attribute_can_be_applied_only_to_symbol_declaration)
4869 << "dllimport";
4870 FD->setInvalidDecl();
John McCalld226f652010-08-21 09:40:31 +00004871 return FD;
Ted Kremenek12911a82010-02-21 05:12:53 +00004872 }
4873
4874 // Visual C++ appears to not think this is an issue, so only issue
4875 // a warning when Microsoft extensions are disabled.
4876 if (!LangOpts.Microsoft) {
Anton Korobeynikov2f402702008-12-26 00:52:02 +00004877 // If a symbol previously declared dllimport is later defined, the
4878 // attribute is ignored in subsequent references, and a warning is
4879 // emitted.
4880 Diag(FD->getLocation(),
4881 diag::warn_redeclaration_without_attribute_prev_attribute_ignored)
Daniel Dunbar4087f272010-08-17 22:39:59 +00004882 << FD->getName() << "dllimport";
Anton Korobeynikov2f402702008-12-26 00:52:02 +00004883 }
4884 }
John McCalld226f652010-08-21 09:40:31 +00004885 return FD;
Reid Spencer5f016e22007-07-11 17:01:13 +00004886}
4887
Douglas Gregor5077c382010-05-15 06:01:05 +00004888/// \brief Given the set of return statements within a function body,
4889/// compute the variables that are subject to the named return value
4890/// optimization.
4891///
4892/// Each of the variables that is subject to the named return value
4893/// optimization will be marked as NRVO variables in the AST, and any
4894/// return statement that has a marked NRVO variable as its NRVO candidate can
4895/// use the named return value optimization.
4896///
4897/// This function applies a very simplistic algorithm for NRVO: if every return
4898/// statement in the function has the same NRVO candidate, that candidate is
4899/// the NRVO variable.
4900///
4901/// FIXME: Employ a smarter algorithm that accounts for multiple return
4902/// statements and the lifetimes of the NRVO candidates. We should be able to
4903/// find a maximal set of NRVO variables.
John McCall781472f2010-08-25 08:40:02 +00004904static void ComputeNRVO(Stmt *Body, FunctionScopeInfo *Scope) {
4905 ReturnStmt **Returns = Scope->Returns.data();
4906
Douglas Gregor5077c382010-05-15 06:01:05 +00004907 const VarDecl *NRVOCandidate = 0;
John McCall781472f2010-08-25 08:40:02 +00004908 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) {
Douglas Gregor5077c382010-05-15 06:01:05 +00004909 if (!Returns[I]->getNRVOCandidate())
4910 return;
4911
4912 if (!NRVOCandidate)
4913 NRVOCandidate = Returns[I]->getNRVOCandidate();
4914 else if (NRVOCandidate != Returns[I]->getNRVOCandidate())
4915 return;
4916 }
4917
4918 if (NRVOCandidate)
4919 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true);
4920}
4921
John McCallf312b1e2010-08-26 23:41:50 +00004922Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) {
Douglas Gregore2c31ff2009-05-15 17:59:04 +00004923 return ActOnFinishFunctionBody(D, move(BodyArg), false);
4924}
4925
John McCall9ae2f072010-08-23 23:25:46 +00004926Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body,
4927 bool IsInstantiation) {
Douglas Gregord83d0402009-08-22 00:34:47 +00004928 FunctionDecl *FD = 0;
4929 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl);
4930 if (FunTmpl)
4931 FD = FunTmpl->getTemplatedDecl();
4932 else
4933 FD = dyn_cast_or_null<FunctionDecl>(dcl);
4934
Ted Kremenekd064fdc2010-03-23 00:13:23 +00004935 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy();
Ted Kremenekdbdbaaf2010-03-20 21:06:02 +00004936
Douglas Gregord83d0402009-08-22 00:34:47 +00004937 if (FD) {
Chris Lattnera5251fc2009-04-18 09:36:27 +00004938 FD->setBody(Body);
Ted Kremenekdbdbaaf2010-03-20 21:06:02 +00004939 if (FD->isMain()) {
Mike Stump5f28a1e2009-07-24 02:49:01 +00004940 // C and C++ allow for main to automagically return 0.
John McCall0cfeb632009-07-28 01:00:58 +00004941 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3.
4942 FD->setHasImplicitReturnZero(true);
Ted Kremenekd064fdc2010-03-23 00:13:23 +00004943 WP.disableCheckFallThrough();
Ted Kremenekdbdbaaf2010-03-20 21:06:02 +00004944 }
Mike Stump1eb44332009-09-09 15:08:12 +00004945
Douglas Gregor6fb745b2010-05-13 16:44:06 +00004946 if (!FD->isInvalidDecl()) {
Douglas Gregore0762c92009-06-19 23:52:42 +00004947 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end());
Douglas Gregor6fb745b2010-05-13 16:44:06 +00004948
4949 // If this is a constructor, we need a vtable.
4950 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD))
4951 MarkVTableUsed(FD->getLocation(), Constructor->getParent());
Douglas Gregor5077c382010-05-15 06:01:05 +00004952
John McCall781472f2010-08-25 08:40:02 +00004953 ComputeNRVO(Body, getCurFunction());
Douglas Gregor6fb745b2010-05-13 16:44:06 +00004954 }
4955
Argyrios Kyrtzidis53d0ea52008-06-28 06:07:14 +00004956 assert(FD == getCurFunctionDecl() && "Function parsing confused");
Steve Naroff394f3f42008-07-25 17:57:26 +00004957 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) {
Chris Lattnerffed1632009-02-16 19:27:54 +00004958 assert(MD == getCurMethodDecl() && "Method parsing confused");
Chris Lattnera5251fc2009-04-18 09:36:27 +00004959 MD->setBody(Body);
Argyrios Kyrtzidisa2e85ad2009-07-18 00:33:33 +00004960 MD->setEndLoc(Body->getLocEnd());
Douglas Gregore0762c92009-06-19 23:52:42 +00004961 if (!MD->isInvalidDecl())
4962 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end());
Ted Kremenek8189cde2009-02-07 01:47:29 +00004963 } else {
John McCalld226f652010-08-21 09:40:31 +00004964 return 0;
Ted Kremenek8189cde2009-02-07 01:47:29 +00004965 }
Douglas Gregore2c31ff2009-05-15 17:59:04 +00004966
Reid Spencer5f016e22007-07-11 17:01:13 +00004967 // Verify and clean out per-function state.
Eli Friedman8f17b662009-02-28 05:41:13 +00004968
Reid Spencer5f016e22007-07-11 17:01:13 +00004969 // Check goto/label use.
John McCall781472f2010-08-25 08:40:02 +00004970 FunctionScopeInfo *CurFn = getCurFunction();
Steve Naroffcaaacec2009-03-13 15:38:40 +00004971 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator
John McCall781472f2010-08-25 08:40:02 +00004972 I = CurFn->LabelMap.begin(), E = CurFn->LabelMap.end(); I != E; ++I) {
Chris Lattnere32f74c2009-04-18 19:30:02 +00004973 LabelStmt *L = I->second;
Mike Stump1eb44332009-09-09 15:08:12 +00004974
Reid Spencer5f016e22007-07-11 17:01:13 +00004975 // Verify that we have no forward references left. If so, there was a goto
4976 // or address of a label taken, but no definition of it. Label fwd
4977 // definitions are indicated with a null substmt.
Chris Lattnere32f74c2009-04-18 19:30:02 +00004978 if (L->getSubStmt() != 0)
4979 continue;
Mike Stump1eb44332009-09-09 15:08:12 +00004980
Chris Lattnere32f74c2009-04-18 19:30:02 +00004981 // Emit error.
4982 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName();
Mike Stump1eb44332009-09-09 15:08:12 +00004983
Chris Lattnere32f74c2009-04-18 19:30:02 +00004984 // At this point, we have gotos that use the bogus label. Stitch it into
4985 // the function body so that they aren't leaked and that the AST is well
4986 // formed.
4987 if (Body == 0) {
Douglas Gregorff331c12010-07-25 18:17:45 +00004988 // The whole function wasn't parsed correctly.
Chris Lattnere32f74c2009-04-18 19:30:02 +00004989 continue;
Reid Spencer5f016e22007-07-11 17:01:13 +00004990 }
Mike Stump1eb44332009-09-09 15:08:12 +00004991
Chris Lattnere32f74c2009-04-18 19:30:02 +00004992 // Otherwise, the body is valid: we want to stitch the label decl into the
4993 // function somewhere so that it is properly owned and so that the goto
4994 // has a valid target. Do this by creating a new compound stmt with the
4995 // label in it.
Sebastian Redld3a413d2009-04-26 20:35:05 +00004996
Chris Lattnere32f74c2009-04-18 19:30:02 +00004997 // Give the label a sub-statement.
4998 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc()));
Sebastian Redld3a413d2009-04-26 20:35:05 +00004999
5000 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ?
5001 cast<CXXTryStmt>(Body)->getTryBlock() :
5002 cast<CompoundStmt>(Body);
Ted Kremenek4c9f7092010-03-12 22:22:36 +00005003 llvm::SmallVector<Stmt*, 64> Elements(Compound->body_begin(),
5004 Compound->body_end());
Chris Lattnere32f74c2009-04-18 19:30:02 +00005005 Elements.push_back(L);
Ted Kremenek4c9f7092010-03-12 22:22:36 +00005006 Compound->setStmts(Context, Elements.data(), Elements.size());
Reid Spencer5f016e22007-07-11 17:01:13 +00005007 }
Eli Friedman8f17b662009-02-28 05:41:13 +00005008
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00005009 if (Body) {
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00005010 // C++ constructors that have function-try-blocks can't have return
5011 // statements in the handlers of that block. (C++ [except.handle]p14)
5012 // Verify this.
5013 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body))
5014 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body));
5015
Ted Kremenekdbdbaaf2010-03-20 21:06:02 +00005016 // Verify that that gotos and switch cases don't jump into scopes illegally.
5017 // Verify that that gotos and switch cases don't jump into scopes illegally.
John McCall781472f2010-08-25 08:40:02 +00005018 if (getCurFunction()->NeedsScopeChecking() &&
John McCall8a2ca742010-05-20 07:13:26 +00005019 !dcl->isInvalidDecl() &&
John McCalldae69ef2010-05-20 07:05:55 +00005020 !hasAnyErrorsInThisFunction())
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00005021 DiagnoseInvalidJumps(Body);
Mike Stump1eb44332009-09-09 15:08:12 +00005022
John McCall15442822010-08-04 01:04:25 +00005023 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) {
5024 if (!Destructor->getParent()->isDependentType())
5025 CheckDestructor(Destructor);
5026
John McCallef027fe2010-03-16 21:39:52 +00005027 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(),
5028 Destructor->getParent());
John McCall15442822010-08-04 01:04:25 +00005029 }
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00005030
5031 // If any errors have occurred, clear out any temporaries that may have
5032 // been leftover. This ensures that these temporaries won't be picked up for
5033 // deletion in some later function.
5034 if (PP.getDiagnostics().hasErrorOccurred())
5035 ExprTemporaries.clear();
Ted Kremenekdbdbaaf2010-03-20 21:06:02 +00005036 else if (!isa<FunctionTemplateDecl>(dcl)) {
5037 // Since the body is valid, issue any analysis-based warnings that are
5038 // enabled.
5039 QualType ResultType;
5040 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(dcl)) {
John McCalle0054f62010-08-25 05:56:39 +00005041 AnalysisWarnings.IssueWarnings(WP, FD);
5042 } else {
Ted Kremenekdbdbaaf2010-03-20 21:06:02 +00005043 ObjCMethodDecl *MD = cast<ObjCMethodDecl>(dcl);
John McCalle0054f62010-08-25 05:56:39 +00005044 AnalysisWarnings.IssueWarnings(WP, MD);
Ted Kremenekdbdbaaf2010-03-20 21:06:02 +00005045 }
Ted Kremenekdbdbaaf2010-03-20 21:06:02 +00005046 }
5047
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00005048 assert(ExprTemporaries.empty() && "Leftover temporaries in function");
5049 }
5050
John McCall90f97892010-03-25 22:08:03 +00005051 if (!IsInstantiation)
5052 PopDeclContext();
5053
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00005054 PopFunctionOrBlockScope();
Anders Carlssonf8a9a792009-11-13 19:21:49 +00005055
Douglas Gregord5b57282009-11-15 07:07:58 +00005056 // If any errors have occurred, clear out any temporaries that may have
5057 // been leftover. This ensures that these temporaries won't be picked up for
5058 // deletion in some later function.
Chris Lattner6d97e5e2010-03-01 20:59:53 +00005059 if (getDiagnostics().hasErrorOccurred())
Douglas Gregord5b57282009-11-15 07:07:58 +00005060 ExprTemporaries.clear();
Argyrios Kyrtzidis49b96d12010-08-13 18:42:17 +00005061
John McCalld226f652010-08-21 09:40:31 +00005062 return dcl;
Fariborz Jahanian60fbca02007-11-10 16:31:34 +00005063}
5064
Reid Spencer5f016e22007-07-11 17:01:13 +00005065/// ImplicitlyDefineFunction - An undeclared identifier was used in a function
5066/// call, forming a call to an implicitly defined function (per C99 6.5.1p2).
Mike Stump1eb44332009-09-09 15:08:12 +00005067NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc,
Douglas Gregor4afa39d2009-01-20 01:17:11 +00005068 IdentifierInfo &II, Scope *S) {
Douglas Gregor63935192009-03-02 00:19:53 +00005069 // Before we produce a declaration for an implicitly defined
5070 // function, see whether there was a locally-scoped declaration of
5071 // this name as a function or variable. If so, use that
5072 // (non-visible) declaration, and complain about it.
5073 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
5074 = LocallyScopedExternalDecls.find(&II);
5075 if (Pos != LocallyScopedExternalDecls.end()) {
5076 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second;
5077 Diag(Pos->second->getLocation(), diag::note_previous_declaration);
5078 return Pos->second;
5079 }
5080
Chris Lattner37d10842008-05-05 21:18:06 +00005081 // Extension in C99. Legal in C90, but warn about it.
Daniel Dunbar01eb9b92009-10-18 21:17:35 +00005082 if (II.getName().startswith("__builtin_"))
Douglas Gregor9a8c9a22009-09-28 21:14:19 +00005083 Diag(Loc, diag::warn_builtin_unknown) << &II;
5084 else if (getLangOptions().C99)
Chris Lattner3c73c412008-11-19 08:23:25 +00005085 Diag(Loc, diag::ext_implicit_function_decl) << &II;
Chris Lattner37d10842008-05-05 21:18:06 +00005086 else
Chris Lattner3c73c412008-11-19 08:23:25 +00005087 Diag(Loc, diag::warn_implicit_function_decl) << &II;
Mike Stump1eb44332009-09-09 15:08:12 +00005088
Reid Spencer5f016e22007-07-11 17:01:13 +00005089 // Set a Declarator for the implicit definition: int foo();
5090 const char *Dummy;
5091 DeclSpec DS;
John McCallfec54012009-08-03 20:12:06 +00005092 unsigned DiagID;
5093 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID);
Reid Spencer5f016e22007-07-11 17:01:13 +00005094 Error = Error; // Silence warning.
5095 assert(!Error && "Error setting up implicit decl!");
5096 Declarator D(DS, Declarator::BlockContext);
Sebastian Redl7dc81342009-04-29 17:30:04 +00005097 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0,
Sebastian Redl3cc97262009-05-31 11:47:27 +00005098 0, 0, false, SourceLocation(),
Argyrios Kyrtzidis82bf0102009-08-19 23:14:54 +00005099 false, 0,0,0, Loc, Loc, D),
Sebastian Redlab197ba2009-02-09 18:23:29 +00005100 SourceLocation());
Reid Spencer5f016e22007-07-11 17:01:13 +00005101 D.SetIdentifier(&II, Loc);
Sebastian Redlab197ba2009-02-09 18:23:29 +00005102
Argyrios Kyrtzidis93213bb2008-05-01 21:04:16 +00005103 // Insert this function into translation-unit scope.
5104
5105 DeclContext *PrevDC = CurContext;
5106 CurContext = Context.getTranslationUnitDecl();
Mike Stump1eb44332009-09-09 15:08:12 +00005107
John McCalld226f652010-08-21 09:40:31 +00005108 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D));
Steve Naroffe2ef8152008-04-04 14:32:09 +00005109 FD->setImplicit();
Argyrios Kyrtzidis93213bb2008-05-01 21:04:16 +00005110
5111 CurContext = PrevDC;
5112
Douglas Gregor3c385e52009-02-14 18:57:46 +00005113 AddKnownFunctionAttributes(FD);
5114
Steve Naroffe2ef8152008-04-04 14:32:09 +00005115 return FD;
Reid Spencer5f016e22007-07-11 17:01:13 +00005116}
5117
Douglas Gregor3c385e52009-02-14 18:57:46 +00005118/// \brief Adds any function attributes that we know a priori based on
5119/// the declaration of this function.
5120///
5121/// These attributes can apply both to implicitly-declared builtins
5122/// (like __builtin___printf_chk) or to library-declared functions
5123/// like NSLog or printf.
5124void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) {
5125 if (FD->isInvalidDecl())
5126 return;
5127
5128 // If this is a built-in function, map its builtin attributes to
5129 // actual attributes.
Douglas Gregor7814e6d2009-09-12 00:22:50 +00005130 if (unsigned BuiltinID = FD->getBuiltinID()) {
Douglas Gregor3c385e52009-02-14 18:57:46 +00005131 // Handle printf-formatting attributes.
5132 unsigned FormatIdx;
5133 bool HasVAListArg;
5134 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) {
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00005135 if (!FD->getAttr<FormatAttr>())
Sean Huntcf807c42010-08-18 23:23:40 +00005136 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context,
5137 "printf", FormatIdx+1,
Ted Kremenek3d2c43e2010-02-11 05:28:37 +00005138 HasVAListArg ? 0 : FormatIdx+2));
Douglas Gregor3c385e52009-02-14 18:57:46 +00005139 }
Ted Kremenekbee05c12010-07-16 02:11:15 +00005140 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx,
5141 HasVAListArg)) {
5142 if (!FD->getAttr<FormatAttr>())
Sean Huntcf807c42010-08-18 23:23:40 +00005143 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context,
5144 "scanf", FormatIdx+1,
Ted Kremenekbee05c12010-07-16 02:11:15 +00005145 HasVAListArg ? 0 : FormatIdx+2));
5146 }
Daniel Dunbaref2abfe2009-02-16 22:43:43 +00005147
5148 // Mark const if we don't care about errno and that is the only
5149 // thing preventing the function from being const. This allows
5150 // IRgen to use LLVM intrinsics for such functions.
5151 if (!getLangOptions().MathErrno &&
5152 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) {
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00005153 if (!FD->getAttr<ConstAttr>())
Sean Huntcf807c42010-08-18 23:23:40 +00005154 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context));
Daniel Dunbaref2abfe2009-02-16 22:43:43 +00005155 }
Mike Stump0feecbb2009-07-27 19:14:18 +00005156
5157 if (Context.BuiltinInfo.isNoReturn(BuiltinID))
John McCall04a67a62010-02-05 21:31:56 +00005158 FD->setType(Context.getNoReturnType(FD->getType()));
Chris Lattner551f7082009-12-30 22:06:22 +00005159 if (Context.BuiltinInfo.isNoThrow(BuiltinID))
Sean Huntcf807c42010-08-18 23:23:40 +00005160 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context));
Chris Lattner551f7082009-12-30 22:06:22 +00005161 if (Context.BuiltinInfo.isConst(BuiltinID))
Sean Huntcf807c42010-08-18 23:23:40 +00005162 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context));
Douglas Gregor3c385e52009-02-14 18:57:46 +00005163 }
5164
5165 IdentifierInfo *Name = FD->getIdentifier();
5166 if (!Name)
5167 return;
Mike Stump1eb44332009-09-09 15:08:12 +00005168 if ((!getLangOptions().CPlusPlus &&
Douglas Gregor3c385e52009-02-14 18:57:46 +00005169 FD->getDeclContext()->isTranslationUnit()) ||
5170 (isa<LinkageSpecDecl>(FD->getDeclContext()) &&
Mike Stump1eb44332009-09-09 15:08:12 +00005171 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() ==
Douglas Gregor3c385e52009-02-14 18:57:46 +00005172 LinkageSpecDecl::lang_c)) {
5173 // Okay: this could be a libc/libm/Objective-C function we know
5174 // about.
5175 } else
5176 return;
5177
Douglas Gregor21e072b2009-04-22 20:56:09 +00005178 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) {
Mike Stump523a8fd2009-07-28 00:07:08 +00005179 // FIXME: NSLog and NSLogv should be target specific
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00005180 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) {
Douglas Gregor3c385e52009-02-14 18:57:46 +00005181 // FIXME: We known better than our headers.
Ted Kremenek3d2c43e2010-02-11 05:28:37 +00005182 const_cast<FormatAttr *>(Format)->setType(Context, "printf");
Mike Stump1eb44332009-09-09 15:08:12 +00005183 } else
Sean Huntcf807c42010-08-18 23:23:40 +00005184 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context,
5185 "printf", 1,
Eli Friedmand7dad722009-06-10 04:01:38 +00005186 Name->isStr("NSLogv") ? 0 : 2));
Douglas Gregor21e072b2009-04-22 20:56:09 +00005187 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) {
Mike Stump523a8fd2009-07-28 00:07:08 +00005188 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be
Mike Stump1eb44332009-09-09 15:08:12 +00005189 // target-specific builtins, perhaps?
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00005190 if (!FD->getAttr<FormatAttr>())
Sean Huntcf807c42010-08-18 23:23:40 +00005191 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context,
5192 "printf", 2,
Eli Friedmand7dad722009-06-10 04:01:38 +00005193 Name->isStr("vasprintf") ? 0 : 3));
Mike Stump782fa302009-07-28 02:25:19 +00005194 }
Douglas Gregor3c385e52009-02-14 18:57:46 +00005195}
Reid Spencer5f016e22007-07-11 17:01:13 +00005196
John McCallba6a9bd2009-10-24 08:00:42 +00005197TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T,
John McCalla93c9342009-12-07 02:54:59 +00005198 TypeSourceInfo *TInfo) {
Reid Spencer5f016e22007-07-11 17:01:13 +00005199 assert(D.getIdentifier() && "Wrong callback for declspec without declarator");
Steve Naroff5912a352007-08-28 20:14:24 +00005200 assert(!T.isNull() && "GetTypeForDeclarator() returned null type");
Mike Stump1eb44332009-09-09 15:08:12 +00005201
John McCalla93c9342009-12-07 02:54:59 +00005202 if (!TInfo) {
John McCallba6a9bd2009-10-24 08:00:42 +00005203 assert(D.isInvalidType() && "no declarator info for valid type");
John McCalla93c9342009-12-07 02:54:59 +00005204 TInfo = Context.getTrivialTypeSourceInfo(T);
John McCallba6a9bd2009-10-24 08:00:42 +00005205 }
5206
Reid Spencer5f016e22007-07-11 17:01:13 +00005207 // Scope manipulation handled by caller.
Chris Lattner0ed844b2008-04-04 06:12:32 +00005208 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext,
5209 D.getIdentifierLoc(),
Mike Stump1eb44332009-09-09 15:08:12 +00005210 D.getIdentifier(),
John McCalla93c9342009-12-07 02:54:59 +00005211 TInfo);
Mike Stump1eb44332009-09-09 15:08:12 +00005212
John McCall2191b202009-09-05 06:31:47 +00005213 if (const TagType *TT = T->getAs<TagType>()) {
Anders Carlsson4843e582009-03-10 17:07:44 +00005214 TagDecl *TD = TT->getDecl();
Mike Stump1eb44332009-09-09 15:08:12 +00005215
Anders Carlsson4843e582009-03-10 17:07:44 +00005216 // If the TagDecl that the TypedefDecl points to is an anonymous decl
5217 // keep track of the TypedefDecl.
5218 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl())
5219 TD->setTypedefForAnonDecl(NewTD);
5220 }
5221
Chris Lattnereaaebc72009-04-25 08:06:05 +00005222 if (D.isInvalidType())
Steve Naroff5912a352007-08-28 20:14:24 +00005223 NewTD->setInvalidDecl();
5224 return NewTD;
Reid Spencer5f016e22007-07-11 17:01:13 +00005225}
5226
Douglas Gregor501c5ce2009-05-14 16:41:31 +00005227
5228/// \brief Determine whether a tag with a given kind is acceptable
5229/// as a redeclaration of the given tag declaration.
5230///
5231/// \returns true if the new tag kind is acceptable, false otherwise.
Mike Stump1eb44332009-09-09 15:08:12 +00005232bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous,
Abramo Bagnara465d41b2010-05-11 21:36:43 +00005233 TagTypeKind NewTag,
Douglas Gregor501c5ce2009-05-14 16:41:31 +00005234 SourceLocation NewTagLoc,
5235 const IdentifierInfo &Name) {
5236 // C++ [dcl.type.elab]p3:
5237 // The class-key or enum keyword present in the
5238 // elaborated-type-specifier shall agree in kind with the
Abramo Bagnara465d41b2010-05-11 21:36:43 +00005239 // declaration to which the name in the elaborated-type-specifier
Douglas Gregor501c5ce2009-05-14 16:41:31 +00005240 // refers. This rule also applies to the form of
5241 // elaborated-type-specifier that declares a class-name or
5242 // friend class since it can be construed as referring to the
5243 // definition of the class. Thus, in any
5244 // elaborated-type-specifier, the enum keyword shall be used to
Abramo Bagnara465d41b2010-05-11 21:36:43 +00005245 // refer to an enumeration (7.2), the union class-key shall be
Douglas Gregor501c5ce2009-05-14 16:41:31 +00005246 // used to refer to a union (clause 9), and either the class or
5247 // struct class-key shall be used to refer to a class (clause 9)
5248 // declared using the class or struct class-key.
Abramo Bagnara465d41b2010-05-11 21:36:43 +00005249 TagTypeKind OldTag = Previous->getTagKind();
Douglas Gregor501c5ce2009-05-14 16:41:31 +00005250 if (OldTag == NewTag)
5251 return true;
Mike Stump1eb44332009-09-09 15:08:12 +00005252
Abramo Bagnara465d41b2010-05-11 21:36:43 +00005253 if ((OldTag == TTK_Struct || OldTag == TTK_Class) &&
5254 (NewTag == TTK_Struct || NewTag == TTK_Class)) {
Douglas Gregor501c5ce2009-05-14 16:41:31 +00005255 // Warn about the struct/class tag mismatch.
5256 bool isTemplate = false;
5257 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous))
5258 isTemplate = Record->getDescribedClassTemplate();
5259
5260 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch)
Abramo Bagnara465d41b2010-05-11 21:36:43 +00005261 << (NewTag == TTK_Class)
Douglas Gregor501c5ce2009-05-14 16:41:31 +00005262 << isTemplate << &Name
Douglas Gregor849b2432010-03-31 17:46:05 +00005263 << FixItHint::CreateReplacement(SourceRange(NewTagLoc),
Abramo Bagnara465d41b2010-05-11 21:36:43 +00005264 OldTag == TTK_Class? "class" : "struct");
Douglas Gregor501c5ce2009-05-14 16:41:31 +00005265 Diag(Previous->getLocation(), diag::note_previous_use);
5266 return true;
5267 }
5268 return false;
5269}
5270
Steve Naroff08d92e42007-09-15 18:49:24 +00005271/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the
Reid Spencer5f016e22007-07-11 17:01:13 +00005272/// former case, Name will be non-null. In the later case, Name will be null.
John McCall0f434ec2009-07-31 02:45:11 +00005273/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a
Reid Spencer5f016e22007-07-11 17:01:13 +00005274/// reference/declaration/definition of a tag.
John McCalld226f652010-08-21 09:40:31 +00005275Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +00005276 SourceLocation KWLoc, CXXScopeSpec &SS,
Chris Lattnerb28317a2009-03-28 19:18:32 +00005277 IdentifierInfo *Name, SourceLocation NameLoc,
Douglas Gregor402abb52009-05-28 23:31:59 +00005278 AttributeList *Attr, AccessSpecifier AS,
Douglas Gregor7cdbc582009-07-22 23:48:44 +00005279 MultiTemplateParamsArg TemplateParameterLists,
John McCallc4e70192009-09-11 04:59:25 +00005280 bool &OwnedDecl, bool &IsDependent) {
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005281 // If this is not a definition, it must have a name.
John McCall0f434ec2009-07-31 02:45:11 +00005282 assert((Name != 0 || TUK == TUK_Definition) &&
Reid Spencer5f016e22007-07-11 17:01:13 +00005283 "Nameless record must be a definition!");
Douglas Gregoraaba5e32009-02-04 19:02:06 +00005284
Douglas Gregor402abb52009-05-28 23:31:59 +00005285 OwnedDecl = false;
Abramo Bagnara465d41b2010-05-11 21:36:43 +00005286 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
Mike Stump1eb44332009-09-09 15:08:12 +00005287
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005288 // FIXME: Check explicit specializations more carefully.
5289 bool isExplicitSpecialization = false;
Abramo Bagnara9b934882010-06-12 08:15:14 +00005290 unsigned NumMatchedTemplateParamLists = TemplateParameterLists.size();
Douglas Gregor0167f3c2010-07-14 23:14:12 +00005291 bool Invalid = false;
John McCall0f434ec2009-07-31 02:45:11 +00005292 if (TUK != TUK_Reference) {
Douglas Gregor7cdbc582009-07-22 23:48:44 +00005293 if (TemplateParameterList *TemplateParams
5294 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS,
5295 (TemplateParameterList**)TemplateParameterLists.get(),
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005296 TemplateParameterLists.size(),
John McCall77e8b112010-04-13 20:37:33 +00005297 TUK == TUK_Friend,
Douglas Gregor0167f3c2010-07-14 23:14:12 +00005298 isExplicitSpecialization,
5299 Invalid)) {
Abramo Bagnara9b934882010-06-12 08:15:14 +00005300 // All but one template parameter lists have been matching.
5301 --NumMatchedTemplateParamLists;
5302
Douglas Gregord85bea22009-09-26 06:47:28 +00005303 if (TemplateParams->size() > 0) {
Douglas Gregor7cdbc582009-07-22 23:48:44 +00005304 // This is a declaration or definition of a class template (which may
5305 // be a member of another template).
Douglas Gregor0167f3c2010-07-14 23:14:12 +00005306 if (Invalid)
John McCalld226f652010-08-21 09:40:31 +00005307 return 0;
Douglas Gregor0167f3c2010-07-14 23:14:12 +00005308
Douglas Gregor7cdbc582009-07-22 23:48:44 +00005309 OwnedDecl = false;
John McCall0f434ec2009-07-31 02:45:11 +00005310 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc,
Douglas Gregor7cdbc582009-07-22 23:48:44 +00005311 SS, Name, NameLoc, Attr,
Douglas Gregor05396e22009-08-25 17:23:04 +00005312 TemplateParams,
Douglas Gregor7cdbc582009-07-22 23:48:44 +00005313 AS);
Douglas Gregor05396e22009-08-25 17:23:04 +00005314 TemplateParameterLists.release();
Douglas Gregor7cdbc582009-07-22 23:48:44 +00005315 return Result.get();
5316 } else {
Douglas Gregorf6b11852009-10-08 15:14:33 +00005317 // The "template<>" header is extraneous.
5318 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams)
Abramo Bagnara465d41b2010-05-11 21:36:43 +00005319 << TypeWithKeyword::getTagTypeKindName(Kind) << Name;
Douglas Gregorf6b11852009-10-08 15:14:33 +00005320 isExplicitSpecialization = true;
Douglas Gregor7cdbc582009-07-22 23:48:44 +00005321 }
Mike Stump1eb44332009-09-09 15:08:12 +00005322 }
5323 }
5324
Douglas Gregor4920f1f2009-01-12 22:49:06 +00005325 DeclContext *SearchDC = CurContext;
Argyrios Kyrtzidis0f84a232008-11-09 22:53:32 +00005326 DeclContext *DC = CurContext;
Douglas Gregor7adb10f2009-09-15 22:30:29 +00005327 bool isStdBadAlloc = false;
Douglas Gregor0b7a1582009-01-17 00:42:38 +00005328
Chandler Carruth7bf36002010-03-01 21:17:36 +00005329 RedeclarationKind Redecl = ForRedeclaration;
5330 if (TUK == TUK_Friend || TUK == TUK_Reference)
5331 Redecl = NotForRedeclaration;
John McCall68263142009-11-18 22:49:29 +00005332
5333 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl);
John McCall6e247262009-10-10 05:48:19 +00005334
Argyrios Kyrtzidis630c81b2008-11-09 22:09:58 +00005335 if (Name && SS.isNotEmpty()) {
5336 // We have a nested-name tag ('struct foo::bar').
5337
5338 // Check for invalid 'foo::'.
Argyrios Kyrtzidis0f84a232008-11-09 22:53:32 +00005339 if (SS.isInvalid()) {
Argyrios Kyrtzidis630c81b2008-11-09 22:09:58 +00005340 Name = 0;
5341 goto CreateNewDecl;
5342 }
5343
John McCallc4e70192009-09-11 04:59:25 +00005344 // If this is a friend or a reference to a class in a dependent
5345 // context, don't try to make a decl for it.
5346 if (TUK == TUK_Friend || TUK == TUK_Reference) {
5347 DC = computeDeclContext(SS, false);
5348 if (!DC) {
5349 IsDependent = true;
John McCalld226f652010-08-21 09:40:31 +00005350 return 0;
John McCallc4e70192009-09-11 04:59:25 +00005351 }
John McCall77bb1aa2010-05-01 00:40:08 +00005352 } else {
5353 DC = computeDeclContext(SS, true);
5354 if (!DC) {
5355 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec)
5356 << SS.getRange();
John McCalld226f652010-08-21 09:40:31 +00005357 return 0;
John McCall77bb1aa2010-05-01 00:40:08 +00005358 }
John McCallc4e70192009-09-11 04:59:25 +00005359 }
5360
John McCall77bb1aa2010-05-01 00:40:08 +00005361 if (RequireCompleteDeclContext(SS, DC))
John McCalld226f652010-08-21 09:40:31 +00005362 return 0;
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00005363
Douglas Gregor1931b442009-02-03 00:34:39 +00005364 SearchDC = DC;
Argyrios Kyrtzidis0f84a232008-11-09 22:53:32 +00005365 // Look-up name inside 'foo::'.
John McCall68263142009-11-18 22:49:29 +00005366 LookupQualifiedName(Previous, DC);
John McCall6e247262009-10-10 05:48:19 +00005367
John McCall68263142009-11-18 22:49:29 +00005368 if (Previous.isAmbiguous())
John McCalld226f652010-08-21 09:40:31 +00005369 return 0;
John McCall6e247262009-10-10 05:48:19 +00005370
John McCall68263142009-11-18 22:49:29 +00005371 if (Previous.empty()) {
Douglas Gregor9edad9b2010-01-14 17:47:39 +00005372 // Name lookup did not find anything. However, if the
5373 // nested-name-specifier refers to the current instantiation,
5374 // and that current instantiation has any dependent base
5375 // classes, we might find something at instantiation time: treat
5376 // this as a dependent elaborated-type-specifier.
Douglas Gregor7d3f5762010-01-15 01:44:47 +00005377 if (Previous.wasNotFoundInCurrentInstantiation()) {
Douglas Gregor9edad9b2010-01-14 17:47:39 +00005378 IsDependent = true;
John McCalld226f652010-08-21 09:40:31 +00005379 return 0;
Douglas Gregor9edad9b2010-01-14 17:47:39 +00005380 }
5381
5382 // A tag 'foo::bar' must already exist.
Douglas Gregor1eabb7d2010-03-31 23:17:41 +00005383 Diag(NameLoc, diag::err_not_tag_in_scope)
5384 << Kind << Name << DC << SS.getRange();
Argyrios Kyrtzidis630c81b2008-11-09 22:09:58 +00005385 Name = 0;
Douglas Gregord0c87372009-05-27 17:30:49 +00005386 Invalid = true;
Argyrios Kyrtzidis630c81b2008-11-09 22:09:58 +00005387 goto CreateNewDecl;
5388 }
Chris Lattnercf79b012009-01-21 02:38:50 +00005389 } else if (Name) {
Argyrios Kyrtzidis630c81b2008-11-09 22:09:58 +00005390 // If this is a named struct, check to see if there was a previous forward
5391 // declaration or definition.
Douglas Gregor2a3009a2009-02-03 19:21:40 +00005392 // FIXME: We're looking into outer scopes here, even when we
5393 // shouldn't be. Doing so can result in ambiguities that we
5394 // shouldn't be diagnosing.
John McCall68263142009-11-18 22:49:29 +00005395 LookupName(Previous, S);
5396
5397 // Note: there used to be some attempt at recovery here.
5398 if (Previous.isAmbiguous())
John McCalld226f652010-08-21 09:40:31 +00005399 return 0;
Douglas Gregor72de6672009-01-08 20:45:30 +00005400
John McCall0f434ec2009-07-31 02:45:11 +00005401 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) {
Douglas Gregor72de6672009-01-08 20:45:30 +00005402 // FIXME: This makes sure that we ignore the contexts associated
5403 // with C structs, unions, and enums when looking for a matching
5404 // tag declaration or definition. See the similar lookup tweak
Douglas Gregor4c921ae2009-01-30 01:04:22 +00005405 // in Sema::LookupName; is there a better way to deal with this?
Douglas Gregor4920f1f2009-01-12 22:49:06 +00005406 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC))
5407 SearchDC = SearchDC->getParent();
Douglas Gregor72de6672009-01-08 20:45:30 +00005408 }
Argyrios Kyrtzidis630c81b2008-11-09 22:09:58 +00005409 }
5410
John McCall68263142009-11-18 22:49:29 +00005411 if (Previous.isSingleResult() &&
5412 Previous.getFoundDecl()->isTemplateParameter()) {
Douglas Gregor72c3f312008-12-05 18:15:24 +00005413 // Maybe we will complain about the shadowed template parameter.
John McCall68263142009-11-18 22:49:29 +00005414 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl());
Douglas Gregor72c3f312008-12-05 18:15:24 +00005415 // Just pretend that we didn't see the previous declaration.
John McCall68263142009-11-18 22:49:29 +00005416 Previous.clear();
Douglas Gregor72c3f312008-12-05 18:15:24 +00005417 }
5418
Douglas Gregor7adb10f2009-09-15 22:30:29 +00005419 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace &&
Argyrios Kyrtzidis76c38d32010-08-02 07:14:54 +00005420 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) {
Douglas Gregor7adb10f2009-09-15 22:30:29 +00005421 // This is a declaration of or a reference to "std::bad_alloc".
5422 isStdBadAlloc = true;
5423
John McCall68263142009-11-18 22:49:29 +00005424 if (Previous.empty() && StdBadAlloc) {
Douglas Gregor7adb10f2009-09-15 22:30:29 +00005425 // std::bad_alloc has been implicitly declared (but made invisible to
5426 // name lookup). Fill in this implicit declaration as the previous
5427 // declaration, so that the declarations get chained appropriately.
Argyrios Kyrtzidis76c38d32010-08-02 07:14:54 +00005428 Previous.addDecl(getStdBadAlloc());
Douglas Gregor7adb10f2009-09-15 22:30:29 +00005429 }
5430 }
John McCall68263142009-11-18 22:49:29 +00005431
John McCall9c86b512010-03-25 21:28:06 +00005432 // If we didn't find a previous declaration, and this is a reference
5433 // (or friend reference), move to the correct scope. In C++, we
5434 // also need to do a redeclaration lookup there, just in case
5435 // there's a shadow friend decl.
5436 if (Name && Previous.empty() &&
5437 (TUK == TUK_Reference || TUK == TUK_Friend)) {
5438 if (Invalid) goto CreateNewDecl;
5439 assert(SS.isEmpty());
5440
5441 if (TUK == TUK_Reference) {
5442 // C++ [basic.scope.pdecl]p5:
5443 // -- for an elaborated-type-specifier of the form
5444 //
5445 // class-key identifier
5446 //
5447 // if the elaborated-type-specifier is used in the
5448 // decl-specifier-seq or parameter-declaration-clause of a
5449 // function defined in namespace scope, the identifier is
5450 // declared as a class-name in the namespace that contains
5451 // the declaration; otherwise, except as a friend
5452 // declaration, the identifier is declared in the smallest
5453 // non-class, non-function-prototype scope that contains the
5454 // declaration.
5455 //
5456 // C99 6.7.2.3p8 has a similar (but not identical!) provision for
5457 // C structs and unions.
5458 //
5459 // It is an error in C++ to declare (rather than define) an enum
5460 // type, including via an elaborated type specifier. We'll
5461 // diagnose that later; for now, declare the enum in the same
5462 // scope as we would have picked for any other tag type.
5463 //
5464 // GNU C also supports this behavior as part of its incomplete
5465 // enum types extension, while GNU C++ does not.
5466 //
5467 // Find the context where we'll be declaring the tag.
5468 // FIXME: We would like to maintain the current DeclContext as the
5469 // lexical context,
5470 while (SearchDC->isRecord())
5471 SearchDC = SearchDC->getParent();
5472
5473 // Find the scope where we'll be declaring the tag.
5474 while (S->isClassScope() ||
5475 (getLangOptions().CPlusPlus &&
5476 S->isFunctionPrototypeScope()) ||
5477 ((S->getFlags() & Scope::DeclScope) == 0) ||
5478 (S->getEntity() &&
5479 ((DeclContext *)S->getEntity())->isTransparentContext()))
5480 S = S->getParent();
5481 } else {
5482 assert(TUK == TUK_Friend);
5483 // C++ [namespace.memdef]p3:
5484 // If a friend declaration in a non-local class first declares a
5485 // class or function, the friend class or function is a member of
5486 // the innermost enclosing namespace.
5487 SearchDC = SearchDC->getEnclosingNamespaceContext();
John McCall9c86b512010-03-25 21:28:06 +00005488 }
5489
John McCall0d6b1642010-04-23 18:46:30 +00005490 // In C++, we need to do a redeclaration lookup to properly
5491 // diagnose some problems.
John McCall9c86b512010-03-25 21:28:06 +00005492 if (getLangOptions().CPlusPlus) {
5493 Previous.setRedeclarationKind(ForRedeclaration);
5494 LookupQualifiedName(Previous, SearchDC);
5495 }
5496 }
5497
John McCall68263142009-11-18 22:49:29 +00005498 if (!Previous.empty()) {
Douglas Gregor57265e32010-04-12 16:00:01 +00005499 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl();
John McCall0d6b1642010-04-23 18:46:30 +00005500
5501 // It's okay to have a tag decl in the same scope as a typedef
5502 // which hides a tag decl in the same scope. Finding this
5503 // insanity with a redeclaration lookup can only actually happen
5504 // in C++.
5505 //
5506 // This is also okay for elaborated-type-specifiers, which is
5507 // technically forbidden by the current standard but which is
5508 // okay according to the likely resolution of an open issue;
5509 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407
5510 if (getLangOptions().CPlusPlus) {
5511 if (TypedefDecl *TD = dyn_cast<TypedefDecl>(PrevDecl)) {
5512 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) {
5513 TagDecl *Tag = TT->getDecl();
5514 if (Tag->getDeclName() == Name &&
Sebastian Redl7a126a42010-08-31 00:36:30 +00005515 Tag->getDeclContext()->getRedeclContext()
5516 ->Equals(TD->getDeclContext()->getRedeclContext())) {
John McCall0d6b1642010-04-23 18:46:30 +00005517 PrevDecl = Tag;
5518 Previous.clear();
5519 Previous.addDecl(Tag);
Douglas Gregor757c6002010-08-27 22:55:10 +00005520 Previous.resolveKind();
John McCall0d6b1642010-04-23 18:46:30 +00005521 }
5522 }
5523 }
5524 }
5525
Argyrios Kyrtzidis2d1c5d32008-04-27 13:50:30 +00005526 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) {
Chris Lattner14943b92008-07-03 03:30:58 +00005527 // If this is a use of a previous tag, or if the tag is already declared
5528 // in the same scope (so that the definition/declaration completes or
Argyrios Kyrtzidis2d1c5d32008-04-27 13:50:30 +00005529 // rementions the tag), reuse the decl.
John McCall67d1a672009-08-06 02:15:43 +00005530 if (TUK == TUK_Reference || TUK == TUK_Friend ||
5531 isDeclInScope(PrevDecl, SearchDC, S)) {
Chris Lattner14943b92008-07-03 03:30:58 +00005532 // Make sure that this wasn't declared as an enum and now used as a
5533 // struct or something similar.
Douglas Gregor501c5ce2009-05-14 16:41:31 +00005534 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) {
Mike Stump1eb44332009-09-09 15:08:12 +00005535 bool SafeToContinue
Abramo Bagnara465d41b2010-05-11 21:36:43 +00005536 = (PrevTagDecl->getTagKind() != TTK_Enum &&
5537 Kind != TTK_Enum);
Douglas Gregora3a83512009-04-01 23:51:29 +00005538 if (SafeToContinue)
Mike Stump1eb44332009-09-09 15:08:12 +00005539 Diag(KWLoc, diag::err_use_with_wrong_tag)
Douglas Gregora3a83512009-04-01 23:51:29 +00005540 << Name
Douglas Gregor849b2432010-03-31 17:46:05 +00005541 << FixItHint::CreateReplacement(SourceRange(KWLoc),
5542 PrevTagDecl->getKindName());
Douglas Gregora3a83512009-04-01 23:51:29 +00005543 else
5544 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name;
John McCall68263142009-11-18 22:49:29 +00005545 Diag(PrevTagDecl->getLocation(), diag::note_previous_use);
Douglas Gregora3a83512009-04-01 23:51:29 +00005546
Mike Stump1eb44332009-09-09 15:08:12 +00005547 if (SafeToContinue)
Douglas Gregora3a83512009-04-01 23:51:29 +00005548 Kind = PrevTagDecl->getTagKind();
5549 else {
5550 // Recover by making this an anonymous redefinition.
5551 Name = 0;
John McCall68263142009-11-18 22:49:29 +00005552 Previous.clear();
Douglas Gregora3a83512009-04-01 23:51:29 +00005553 Invalid = true;
5554 }
5555 }
5556
5557 if (!Invalid) {
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005558 // If this is a use, just return the declaration we found.
Chris Lattner14943b92008-07-03 03:30:58 +00005559
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005560 // FIXME: In the future, return a variant or some other clue
5561 // for the consumer of this Decl to know it doesn't own it.
5562 // For our current ASTs this shouldn't be a problem, but will
5563 // need to be changed with DeclGroups.
Douglas Gregore1aa9f32010-06-08 21:27:36 +00005564 if ((TUK == TUK_Reference && !PrevTagDecl->getFriendObjectKind()) ||
5565 TUK == TUK_Friend)
John McCalld226f652010-08-21 09:40:31 +00005566 return PrevTagDecl;
Douglas Gregoraaba5e32009-02-04 19:02:06 +00005567
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005568 // Diagnose attempts to redefine a tag.
John McCall0f434ec2009-07-31 02:45:11 +00005569 if (TUK == TUK_Definition) {
Douglas Gregor952b0172010-02-11 01:04:33 +00005570 if (TagDecl *Def = PrevTagDecl->getDefinition()) {
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005571 // If we're defining a specialization and the previous definition
5572 // is from an implicit instantiation, don't emit an error
5573 // here; we'll catch this in the general case below.
5574 if (!isExplicitSpecialization ||
5575 !isa<CXXRecordDecl>(Def) ||
5576 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind()
5577 == TSK_ExplicitSpecialization) {
5578 Diag(NameLoc, diag::err_redefinition) << Name;
5579 Diag(Def->getLocation(), diag::note_previous_definition);
5580 // If this is a redefinition, recover by making this
5581 // struct be anonymous, which will make any later
5582 // references get the previous definition.
5583 Name = 0;
John McCall68263142009-11-18 22:49:29 +00005584 Previous.clear();
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005585 Invalid = true;
5586 }
Douglas Gregor0b7a1582009-01-17 00:42:38 +00005587 } else {
5588 // If the type is currently being defined, complain
5589 // about a nested redefinition.
5590 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl));
5591 if (Tag->isBeingDefined()) {
5592 Diag(NameLoc, diag::err_nested_redefinition) << Name;
Mike Stump1eb44332009-09-09 15:08:12 +00005593 Diag(PrevTagDecl->getLocation(),
Douglas Gregor0b7a1582009-01-17 00:42:38 +00005594 diag::note_previous_definition);
5595 Name = 0;
John McCall68263142009-11-18 22:49:29 +00005596 Previous.clear();
Douglas Gregor0b7a1582009-01-17 00:42:38 +00005597 Invalid = true;
5598 }
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005599 }
Douglas Gregor0b7a1582009-01-17 00:42:38 +00005600
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005601 // Okay, this is definition of a previously declared or referenced
5602 // tag PrevDecl. We're going to create a new Decl for it.
Douglas Gregor0b7a1582009-01-17 00:42:38 +00005603 }
Argyrios Kyrtzidis2d1c5d32008-04-27 13:50:30 +00005604 }
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005605 // If we get here we have (another) forward declaration or we
John McCall67d1a672009-08-06 02:15:43 +00005606 // have a definition. Just create a new decl.
5607
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005608 } else {
5609 // If we get here, this is a definition of a new tag type in a nested
Mike Stump1eb44332009-09-09 15:08:12 +00005610 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005611 // new decl/type. We set PrevDecl to NULL so that the entities
5612 // have distinct types.
John McCall68263142009-11-18 22:49:29 +00005613 Previous.clear();
Reid Spencer5f016e22007-07-11 17:01:13 +00005614 }
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005615 // If we get here, we're going to create a new Decl. If PrevDecl
5616 // is non-NULL, it's a definition of the tag declared by
5617 // PrevDecl. If it's NULL, we have a new definition.
John McCall0d6b1642010-04-23 18:46:30 +00005618
5619
5620 // Otherwise, PrevDecl is not a tag, but was found with tag
5621 // lookup. This is only actually possible in C++, where a few
5622 // things like templates still live in the tag namespace.
Argyrios Kyrtzidis2d1c5d32008-04-27 13:50:30 +00005623 } else {
John McCall0d6b1642010-04-23 18:46:30 +00005624 assert(getLangOptions().CPlusPlus);
5625
5626 // Use a better diagnostic if an elaborated-type-specifier
5627 // found the wrong kind of type on the first
5628 // (non-redeclaration) lookup.
5629 if ((TUK == TUK_Reference || TUK == TUK_Friend) &&
5630 !Previous.isForRedeclaration()) {
5631 unsigned Kind = 0;
5632 if (isa<TypedefDecl>(PrevDecl)) Kind = 1;
5633 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2;
5634 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind;
5635 Diag(PrevDecl->getLocation(), diag::note_declared_at);
5636 Invalid = true;
5637
5638 // Otherwise, only diagnose if the declaration is in scope.
5639 } else if (!isDeclInScope(PrevDecl, SearchDC, S)) {
5640 // do nothing
5641
5642 // Diagnose implicit declarations introduced by elaborated types.
5643 } else if (TUK == TUK_Reference || TUK == TUK_Friend) {
5644 unsigned Kind = 0;
5645 if (isa<TypedefDecl>(PrevDecl)) Kind = 1;
5646 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2;
5647 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind;
5648 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl;
5649 Invalid = true;
5650
5651 // Otherwise it's a declaration. Call out a particularly common
5652 // case here.
5653 } else if (isa<TypedefDecl>(PrevDecl)) {
5654 Diag(NameLoc, diag::err_tag_definition_of_typedef)
5655 << Name
5656 << cast<TypedefDecl>(PrevDecl)->getUnderlyingType();
5657 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl;
5658 Invalid = true;
5659
5660 // Otherwise, diagnose.
5661 } else {
5662 // The tag name clashes with something else in the target scope,
5663 // issue an error and recover by making this tag be anonymous.
Chris Lattner3c73c412008-11-19 08:23:25 +00005664 Diag(NameLoc, diag::err_redefinition_different_kind) << Name;
Chris Lattner5f4a6822008-11-23 23:12:31 +00005665 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
Argyrios Kyrtzidisb02ef242008-07-16 07:45:46 +00005666 Name = 0;
Douglas Gregor0b7a1582009-01-17 00:42:38 +00005667 Invalid = true;
Argyrios Kyrtzidisb02ef242008-07-16 07:45:46 +00005668 }
John McCall0d6b1642010-04-23 18:46:30 +00005669
5670 // The existing declaration isn't relevant to us; we're in a
5671 // new scope, so clear out the previous declaration.
5672 Previous.clear();
Reid Spencer5f016e22007-07-11 17:01:13 +00005673 }
Reid Spencer5f016e22007-07-11 17:01:13 +00005674 }
Argyrios Kyrtzidisef6e6472008-11-08 17:17:31 +00005675
Chris Lattnercc98eac2008-12-17 07:13:27 +00005676CreateNewDecl:
Mike Stump1eb44332009-09-09 15:08:12 +00005677
John McCall68263142009-11-18 22:49:29 +00005678 TagDecl *PrevDecl = 0;
5679 if (Previous.isSingleResult())
5680 PrevDecl = cast<TagDecl>(Previous.getFoundDecl());
5681
Reid Spencer5f016e22007-07-11 17:01:13 +00005682 // If there is an identifier, use the location of the identifier as the
5683 // location of the decl, otherwise use the location of the struct/union
5684 // keyword.
5685 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc;
Mike Stump1eb44332009-09-09 15:08:12 +00005686
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005687 // Otherwise, create a new declaration. If there is a previous
5688 // declaration of the same entity, the two will be linked via
5689 // PrevDecl.
Reid Spencer5f016e22007-07-11 17:01:13 +00005690 TagDecl *New;
Douglas Gregorbcbffc42009-01-07 00:43:41 +00005691
Abramo Bagnara465d41b2010-05-11 21:36:43 +00005692 if (Kind == TTK_Enum) {
Reid Spencer5f016e22007-07-11 17:01:13 +00005693 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.:
5694 // enum X { A, B, C } D; D should chain to X.
Douglas Gregor741dd9a2009-07-21 14:46:17 +00005695 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc,
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005696 cast_or_null<EnumDecl>(PrevDecl));
Reid Spencer5f016e22007-07-11 17:01:13 +00005697 // If this is an undefined enum, warn.
Douglas Gregorf3a7b7c2010-06-22 14:26:35 +00005698 if (TUK != TUK_Definition && !Invalid) {
5699 TagDecl *Def;
5700 if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) {
5701 Diag(Loc, diag::ext_forward_ref_enum_def)
5702 << New;
5703 Diag(Def->getLocation(), diag::note_previous_definition);
5704 } else {
5705 Diag(Loc,
5706 getLangOptions().CPlusPlus? diag::err_forward_ref_enum
5707 : diag::ext_forward_ref_enum);
5708 }
Douglas Gregor80711a22009-03-06 18:34:03 +00005709 }
Argyrios Kyrtzidis39ba4ae2008-06-09 23:19:58 +00005710 } else {
5711 // struct/union/class
5712
Reid Spencer5f016e22007-07-11 17:01:13 +00005713 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.:
5714 // struct X { int A; } D; D should chain to X.
Douglas Gregor7adb10f2009-09-15 22:30:29 +00005715 if (getLangOptions().CPlusPlus) {
Ted Kremenek2b345eb2008-09-05 17:39:33 +00005716 // FIXME: Look for a way to use RecordDecl for simple structs.
Douglas Gregor741dd9a2009-07-21 14:46:17 +00005717 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc,
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005718 cast_or_null<CXXRecordDecl>(PrevDecl));
Douglas Gregor7adb10f2009-09-15 22:30:29 +00005719
Argyrios Kyrtzidis76c38d32010-08-02 07:14:54 +00005720 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit()))
Douglas Gregor7adb10f2009-09-15 22:30:29 +00005721 StdBadAlloc = cast<CXXRecordDecl>(New);
5722 } else
Douglas Gregor741dd9a2009-07-21 14:46:17 +00005723 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc,
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005724 cast_or_null<RecordDecl>(PrevDecl));
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +00005725 }
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005726
John McCallb6217662010-03-15 10:12:16 +00005727 // Maybe add qualifier info.
5728 if (SS.isNotEmpty()) {
Fariborz Jahanian4fb20532010-05-14 21:35:02 +00005729 if (SS.isSet()) {
5730 NestedNameSpecifier *NNS
5731 = static_cast<NestedNameSpecifier*>(SS.getScopeRep());
5732 New->setQualifierInfo(NNS, SS.getRange());
Abramo Bagnara9b934882010-06-12 08:15:14 +00005733 if (NumMatchedTemplateParamLists > 0) {
Douglas Gregorc722ea42010-06-15 17:44:38 +00005734 New->setTemplateParameterListsInfo(Context,
5735 NumMatchedTemplateParamLists,
Abramo Bagnara9b934882010-06-12 08:15:14 +00005736 (TemplateParameterList**) TemplateParameterLists.release());
5737 }
Fariborz Jahanian4fb20532010-05-14 21:35:02 +00005738 }
5739 else
5740 Invalid = true;
John McCallb6217662010-03-15 10:12:16 +00005741 }
5742
Daniel Dunbar9f21f892010-05-27 01:53:40 +00005743 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) {
5744 // Add alignment attributes if necessary; these attributes are checked when
5745 // the ASTContext lays out the structure.
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005746 //
5747 // It is important for implementing the correct semantics that this
5748 // happen here (in act on tag decl). The #pragma pack stack is
5749 // maintained as a result of parser callbacks which can occur at
5750 // many points during the parsing of a struct declaration (because
5751 // the #pragma tokens are effectively skipped over during the
5752 // parsing of the struct).
Daniel Dunbar9f21f892010-05-27 01:53:40 +00005753 AddAlignmentAttributesForRecord(RD);
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005754 }
5755
Douglas Gregorf6b11852009-10-08 15:14:33 +00005756 // If this is a specialization of a member class (of a class template),
5757 // check the specialization.
John McCall68263142009-11-18 22:49:29 +00005758 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous))
Douglas Gregorf6b11852009-10-08 15:14:33 +00005759 Invalid = true;
Daniel Dunbar9f21f892010-05-27 01:53:40 +00005760
Douglas Gregor0b7a1582009-01-17 00:42:38 +00005761 if (Invalid)
5762 New->setInvalidDecl();
5763
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005764 if (Attr)
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00005765 ProcessDeclAttributeList(S, New, Attr);
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005766
Douglas Gregor0b7a1582009-01-17 00:42:38 +00005767 // If we're declaring or defining a tag in function prototype scope
5768 // in C, note that this type can only be used within the function.
Douglas Gregor3218c4b2009-01-09 22:42:13 +00005769 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus)
5770 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New);
5771
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00005772 // Set the lexical context. If the tag has a C++ scope specifier, the
5773 // lexical context will be different from the semantic context.
Douglas Gregor1931b442009-02-03 00:34:39 +00005774 New->setLexicalDeclContext(CurContext);
Douglas Gregor0b7a1582009-01-17 00:42:38 +00005775
John McCall02cace72009-08-28 07:59:38 +00005776 // Mark this as a friend decl if applicable.
5777 if (TUK == TUK_Friend)
John McCall68263142009-11-18 22:49:29 +00005778 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty());
John McCall02cace72009-08-28 07:59:38 +00005779
Anders Carlsson0cf88302009-03-26 01:19:02 +00005780 // Set the access specifier.
John McCall9c86b512010-03-25 21:28:06 +00005781 if (!Invalid && SearchDC->isRecord())
Douglas Gregord0c87372009-05-27 17:30:49 +00005782 SetMemberAccessSpecifier(New, PrevDecl, AS);
Douglas Gregor06c0fec2009-03-25 22:00:53 +00005783
John McCall0f434ec2009-07-31 02:45:11 +00005784 if (TUK == TUK_Definition)
Douglas Gregor0b7a1582009-01-17 00:42:38 +00005785 New->startDefinition();
Mike Stump1eb44332009-09-09 15:08:12 +00005786
Reid Spencer5f016e22007-07-11 17:01:13 +00005787 // If this has an identifier, add it to the scope stack.
John McCalld7eff682009-09-02 00:55:30 +00005788 if (TUK == TUK_Friend) {
John McCall82b9fb82009-09-02 19:32:14 +00005789 // We might be replacing an existing declaration in the lookup tables;
5790 // if so, borrow its access specifier.
5791 if (PrevDecl)
5792 New->setAccess(PrevDecl->getAccess());
5793
Sebastian Redl7a126a42010-08-31 00:36:30 +00005794 DeclContext *DC = New->getDeclContext()->getRedeclContext();
John McCall9c86b512010-03-25 21:28:06 +00005795 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false);
5796 if (Name) // can be null along some error paths
John McCalld7eff682009-09-02 00:55:30 +00005797 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
5798 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false);
John McCalld7eff682009-09-02 00:55:30 +00005799 } else if (Name) {
Douglas Gregor1a0d31a2009-01-12 18:45:55 +00005800 S = getNonFieldDeclScope(S);
Douglas Gregor1931b442009-02-03 00:34:39 +00005801 PushOnScopeChains(New, S);
Douglas Gregor4920f1f2009-01-12 22:49:06 +00005802 } else {
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00005803 CurContext->addDecl(New);
Reid Spencer5f016e22007-07-11 17:01:13 +00005804 }
Argyrios Kyrtzidis52393042008-11-09 23:41:00 +00005805
Douglas Gregorc29f77b2009-07-07 16:35:42 +00005806 // If this is the C FILE type, notify the AST context.
5807 if (IdentifierInfo *II = New->getIdentifier())
5808 if (!New->isInvalidDecl() &&
Sebastian Redl7a126a42010-08-31 00:36:30 +00005809 New->getDeclContext()->getRedeclContext()->isTranslationUnit() &&
Douglas Gregorc29f77b2009-07-07 16:35:42 +00005810 II->isStr("FILE"))
5811 Context.setFILEDecl(New);
Mike Stump1eb44332009-09-09 15:08:12 +00005812
Douglas Gregor402abb52009-05-28 23:31:59 +00005813 OwnedDecl = true;
John McCalld226f652010-08-21 09:40:31 +00005814 return New;
Reid Spencer5f016e22007-07-11 17:01:13 +00005815}
5816
John McCalld226f652010-08-21 09:40:31 +00005817void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) {
Douglas Gregoraaba5e32009-02-04 19:02:06 +00005818 AdjustDeclIfTemplate(TagD);
John McCalld226f652010-08-21 09:40:31 +00005819 TagDecl *Tag = cast<TagDecl>(TagD);
Douglas Gregor48c89f42010-04-24 16:38:41 +00005820
Douglas Gregor72de6672009-01-08 20:45:30 +00005821 // Enter the tag context.
5822 PushDeclContext(S, Tag);
John McCallf9368152009-12-20 07:58:13 +00005823}
Douglas Gregor72de6672009-01-08 20:45:30 +00005824
John McCalld226f652010-08-21 09:40:31 +00005825void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD,
John McCallf9368152009-12-20 07:58:13 +00005826 SourceLocation LBraceLoc) {
5827 AdjustDeclIfTemplate(TagD);
John McCalld226f652010-08-21 09:40:31 +00005828 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD);
Douglas Gregor72de6672009-01-08 20:45:30 +00005829
John McCallf9368152009-12-20 07:58:13 +00005830 FieldCollector->StartClass();
5831
5832 if (!Record->getIdentifier())
5833 return;
5834
5835 // C++ [class]p2:
5836 // [...] The class-name is also inserted into the scope of the
5837 // class itself; this is known as the injected-class-name. For
5838 // purposes of access checking, the injected-class-name is treated
5839 // as if it were a public member name.
5840 CXXRecordDecl *InjectedClassName
5841 = CXXRecordDecl::Create(Context, Record->getTagKind(),
5842 CurContext, Record->getLocation(),
5843 Record->getIdentifier(),
5844 Record->getTagKeywordLoc(),
5845 Record);
5846 InjectedClassName->setImplicit();
5847 InjectedClassName->setAccess(AS_public);
5848 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate())
5849 InjectedClassName->setDescribedClassTemplate(Template);
5850 PushOnScopeChains(InjectedClassName, S);
5851 assert(InjectedClassName->isInjectedClassName() &&
5852 "Broken injected-class-name");
Douglas Gregor72de6672009-01-08 20:45:30 +00005853}
5854
John McCalld226f652010-08-21 09:40:31 +00005855void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD,
Argyrios Kyrtzidis07a5b282009-07-14 03:17:52 +00005856 SourceLocation RBraceLoc) {
Douglas Gregoraaba5e32009-02-04 19:02:06 +00005857 AdjustDeclIfTemplate(TagD);
John McCalld226f652010-08-21 09:40:31 +00005858 TagDecl *Tag = cast<TagDecl>(TagD);
Argyrios Kyrtzidis07a5b282009-07-14 03:17:52 +00005859 Tag->setRBraceLoc(RBraceLoc);
Douglas Gregor72de6672009-01-08 20:45:30 +00005860
5861 if (isa<CXXRecordDecl>(Tag))
5862 FieldCollector->FinishClass();
5863
5864 // Exit this scope of this tag's definition.
5865 PopDeclContext();
Douglas Gregoradda8462010-01-06 17:00:51 +00005866
Douglas Gregor72de6672009-01-08 20:45:30 +00005867 // Notify the consumer that we've defined a tag.
5868 Consumer.HandleTagDeclDefinition(Tag);
5869}
Chris Lattner5a6ddbf2008-06-21 19:39:06 +00005870
John McCalld226f652010-08-21 09:40:31 +00005871void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) {
John McCalldb7bb4a2010-03-17 00:38:33 +00005872 AdjustDeclIfTemplate(TagD);
John McCalld226f652010-08-21 09:40:31 +00005873 TagDecl *Tag = cast<TagDecl>(TagD);
John McCalldb7bb4a2010-03-17 00:38:33 +00005874 Tag->setInvalidDecl();
5875
John McCalla8cab012010-03-17 19:25:57 +00005876 // We're undoing ActOnTagStartDefinition here, not
5877 // ActOnStartCXXMemberDeclarations, so we don't have to mess with
5878 // the FieldCollector.
John McCalldb7bb4a2010-03-17 00:38:33 +00005879
5880 PopDeclContext();
5881}
5882
Chris Lattnerdf9bcd52009-04-20 17:29:38 +00005883// Note that FieldName may be null for anonymous bitfields.
Mike Stump1eb44332009-09-09 15:08:12 +00005884bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName,
Eli Friedman1d954f62009-08-15 21:55:26 +00005885 QualType FieldTy, const Expr *BitWidth,
5886 bool *ZeroWidth) {
5887 // Default to true; that shouldn't confuse checks for emptiness
5888 if (ZeroWidth)
5889 *ZeroWidth = true;
5890
Chris Lattner24793662009-03-05 22:45:59 +00005891 // C99 6.7.2.1p4 - verify the field type.
Chris Lattner8b963ef2009-03-05 23:01:03 +00005892 // C++ 9.6p3: A bit-field shall have integral or enumeration type.
Douglas Gregor2ade35e2010-06-16 00:17:44 +00005893 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) {
Chris Lattner24793662009-03-05 22:45:59 +00005894 // Handle incomplete types with specific error.
Douglas Gregora03aca82009-03-10 21:58:27 +00005895 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete))
5896 return true;
Chris Lattnerdf9bcd52009-04-20 17:29:38 +00005897 if (FieldName)
5898 return Diag(FieldLoc, diag::err_not_integral_type_bitfield)
5899 << FieldName << FieldTy << BitWidth->getSourceRange();
5900 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield)
5901 << FieldTy << BitWidth->getSourceRange();
Chris Lattner24793662009-03-05 22:45:59 +00005902 }
Douglas Gregor3cf538d2009-03-11 18:59:21 +00005903
5904 // If the bit-width is type- or value-dependent, don't try to check
5905 // it now.
5906 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent())
5907 return false;
5908
Anders Carlsson9f1e5722008-12-06 20:33:04 +00005909 llvm::APSInt Value;
5910 if (VerifyIntegerConstantExpression(BitWidth, &Value))
5911 return true;
5912
Eli Friedman1d954f62009-08-15 21:55:26 +00005913 if (Value != 0 && ZeroWidth)
5914 *ZeroWidth = false;
5915
Chris Lattnercd087072008-12-12 04:56:04 +00005916 // Zero-width bitfield is ok for anonymous field.
5917 if (Value == 0 && FieldName)
5918 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName;
Mike Stump1eb44332009-09-09 15:08:12 +00005919
Chris Lattnerdf9bcd52009-04-20 17:29:38 +00005920 if (Value.isSigned() && Value.isNegative()) {
5921 if (FieldName)
Mike Stump1eb44332009-09-09 15:08:12 +00005922 return Diag(FieldLoc, diag::err_bitfield_has_negative_width)
Chris Lattnerdf9bcd52009-04-20 17:29:38 +00005923 << FieldName << Value.toString(10);
5924 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width)
5925 << Value.toString(10);
5926 }
Anders Carlsson9f1e5722008-12-06 20:33:04 +00005927
Douglas Gregor3cf538d2009-03-11 18:59:21 +00005928 if (!FieldTy->isDependentType()) {
5929 uint64_t TypeSize = Context.getTypeSize(FieldTy);
Chris Lattnerdf9bcd52009-04-20 17:29:38 +00005930 if (Value.getZExtValue() > TypeSize) {
Anders Carlsson72468ec2010-04-16 15:16:32 +00005931 if (!getLangOptions().CPlusPlus) {
5932 if (FieldName)
5933 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size)
5934 << FieldName << (unsigned)Value.getZExtValue()
5935 << (unsigned)TypeSize;
5936
5937 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size)
5938 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize;
5939 }
5940
Chris Lattnerdf9bcd52009-04-20 17:29:38 +00005941 if (FieldName)
Anders Carlsson72468ec2010-04-16 15:16:32 +00005942 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size)
5943 << FieldName << (unsigned)Value.getZExtValue()
5944 << (unsigned)TypeSize;
5945 else
5946 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size)
5947 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize;
Chris Lattnerdf9bcd52009-04-20 17:29:38 +00005948 }
Douglas Gregor3cf538d2009-03-11 18:59:21 +00005949 }
Anders Carlsson9f1e5722008-12-06 20:33:04 +00005950
5951 return false;
5952}
5953
Steve Naroff08d92e42007-09-15 18:49:24 +00005954/// ActOnField - Each field of a struct/union/class is passed into this in order
Reid Spencer5f016e22007-07-11 17:01:13 +00005955/// to create a FieldDecl object for it.
John McCalld226f652010-08-21 09:40:31 +00005956Decl *Sema::ActOnField(Scope *S, Decl *TagD,
Mike Stump1eb44332009-09-09 15:08:12 +00005957 SourceLocation DeclStart,
Chris Lattnerb28317a2009-03-28 19:18:32 +00005958 Declarator &D, ExprTy *BitfieldWidth) {
John McCalld226f652010-08-21 09:40:31 +00005959 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD),
Chris Lattnerb28317a2009-03-28 19:18:32 +00005960 DeclStart, D, static_cast<Expr*>(BitfieldWidth),
5961 AS_public);
John McCalld226f652010-08-21 09:40:31 +00005962 return Res;
Chris Lattner24793662009-03-05 22:45:59 +00005963}
5964
5965/// HandleField - Analyze a field of a C struct or a C++ data member.
5966///
5967FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record,
5968 SourceLocation DeclStart,
Douglas Gregor4dd55f52009-03-11 20:50:30 +00005969 Declarator &D, Expr *BitWidth,
5970 AccessSpecifier AS) {
Reid Spencer5f016e22007-07-11 17:01:13 +00005971 IdentifierInfo *II = D.getIdentifier();
Reid Spencer5f016e22007-07-11 17:01:13 +00005972 SourceLocation Loc = DeclStart;
5973 if (II) Loc = D.getIdentifierLoc();
Mike Stump1eb44332009-09-09 15:08:12 +00005974
John McCallbf1a0282010-06-04 23:28:52 +00005975 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
5976 QualType T = TInfo->getType();
Chris Lattner6491f472009-04-12 22:15:02 +00005977 if (getLangOptions().CPlusPlus)
Douglas Gregor3cf538d2009-03-11 18:59:21 +00005978 CheckExtraCXXDefaultArguments(D);
Douglas Gregor021c3b32009-03-11 23:00:04 +00005979
Eli Friedman85a53192009-04-07 19:37:57 +00005980 DiagnoseFunctionSpecifiers(D);
5981
Eli Friedman63054b32009-04-19 20:27:55 +00005982 if (D.getDeclSpec().isThreadSpecified())
5983 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
Douglas Gregor7f6ff022010-08-30 14:32:14 +00005984
5985 // Check to see if this name was declared as a member previously
5986 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration);
5987 LookupName(Previous, S);
5988 assert((Previous.empty() || Previous.isOverloadedResult() ||
5989 Previous.isSingleResult())
5990 && "Lookup of member name should be either overloaded, single or null");
Eli Friedman63054b32009-04-19 20:27:55 +00005991
Douglas Gregor7f6ff022010-08-30 14:32:14 +00005992 // If the name is overloaded then get any declaration else get the single result
5993 NamedDecl *PrevDecl = Previous.isOverloadedResult() ?
5994 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>();
Douglas Gregorc19ee3e2009-06-17 23:37:01 +00005995
5996 if (PrevDecl && PrevDecl->isTemplateParameter()) {
5997 // Maybe we will complain about the shadowed template parameter.
5998 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
5999 // Just pretend that we didn't see the previous declaration.
6000 PrevDecl = 0;
6001 }
6002
Douglas Gregor3cf538d2009-03-11 18:59:21 +00006003 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S))
6004 PrevDecl = 0;
6005
Steve Naroffea218b82009-07-14 14:58:18 +00006006 bool Mutable
6007 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable);
6008 SourceLocation TSSL = D.getSourceRange().getBegin();
6009 FieldDecl *NewFD
John McCalla93c9342009-12-07 02:54:59 +00006010 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL,
Steve Naroffea218b82009-07-14 14:58:18 +00006011 AS, PrevDecl, &D);
Rafael Espindola01620702010-03-21 22:56:43 +00006012
6013 if (NewFD->isInvalidDecl())
6014 Record->setInvalidDecl();
6015
Douglas Gregor3cf538d2009-03-11 18:59:21 +00006016 if (NewFD->isInvalidDecl() && PrevDecl) {
6017 // Don't introduce NewFD into scope; there's already something
6018 // with the same name in the same scope.
6019 } else if (II) {
6020 PushOnScopeChains(NewFD, S);
6021 } else
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00006022 Record->addDecl(NewFD);
Douglas Gregor3cf538d2009-03-11 18:59:21 +00006023
6024 return NewFD;
6025}
6026
6027/// \brief Build a new FieldDecl and check its well-formedness.
6028///
6029/// This routine builds a new FieldDecl given the fields name, type,
6030/// record, etc. \p PrevDecl should refer to any previous declaration
6031/// with the same name and in the same scope as the field to be
6032/// created.
6033///
6034/// \returns a new FieldDecl.
6035///
Mike Stump1eb44332009-09-09 15:08:12 +00006036/// \todo The Declarator argument is a hack. It will be removed once
Argyrios Kyrtzidisa1d56622009-08-19 01:27:57 +00006037FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T,
John McCalla93c9342009-12-07 02:54:59 +00006038 TypeSourceInfo *TInfo,
Douglas Gregor3cf538d2009-03-11 18:59:21 +00006039 RecordDecl *Record, SourceLocation Loc,
Mike Stump1eb44332009-09-09 15:08:12 +00006040 bool Mutable, Expr *BitWidth,
Steve Naroffea218b82009-07-14 14:58:18 +00006041 SourceLocation TSSL,
Douglas Gregor4dd55f52009-03-11 20:50:30 +00006042 AccessSpecifier AS, NamedDecl *PrevDecl,
Douglas Gregor3cf538d2009-03-11 18:59:21 +00006043 Declarator *D) {
6044 IdentifierInfo *II = Name.getAsIdentifierInfo();
Steve Naroff5912a352007-08-28 20:14:24 +00006045 bool InvalidDecl = false;
Chris Lattnereaaebc72009-04-25 08:06:05 +00006046 if (D) InvalidDecl = D->isInvalidType();
Sebastian Redl64b45f72009-01-05 20:52:13 +00006047
Douglas Gregor3cf538d2009-03-11 18:59:21 +00006048 // If we receive a broken type, recover by assuming 'int' and
6049 // marking this declaration as invalid.
6050 if (T.isNull()) {
6051 InvalidDecl = true;
6052 T = Context.IntTy;
6053 }
6054
Eli Friedman721e77d2009-12-07 00:22:08 +00006055 QualType EltTy = Context.getBaseElementType(T);
6056 if (!EltTy->isDependentType() &&
John McCall2d7d2d92010-08-16 23:42:35 +00006057 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) {
6058 // Fields of incomplete type force their record to be invalid.
6059 Record->setInvalidDecl();
Eli Friedman721e77d2009-12-07 00:22:08 +00006060 InvalidDecl = true;
John McCall2d7d2d92010-08-16 23:42:35 +00006061 }
Eli Friedman721e77d2009-12-07 00:22:08 +00006062
Reid Spencer5f016e22007-07-11 17:01:13 +00006063 // C99 6.7.2.1p8: A member of a structure or union may have any type other
6064 // than a variably modified type.
Eli Friedman721e77d2009-12-07 00:22:08 +00006065 if (!InvalidDecl && T->isVariablyModifiedType()) {
Eli Friedman1ca48132009-02-21 00:44:51 +00006066 bool SizeIsNegative;
Douglas Gregor2767ce22010-08-18 00:39:00 +00006067 llvm::APSInt Oversized;
Eli Friedman1ca48132009-02-21 00:44:51 +00006068 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context,
Douglas Gregor2767ce22010-08-18 00:39:00 +00006069 SizeIsNegative,
6070 Oversized);
Eli Friedman1ca48132009-02-21 00:44:51 +00006071 if (!FixedTy.isNull()) {
6072 Diag(Loc, diag::warn_illegal_constant_array_size);
6073 T = FixedTy;
6074 } else {
6075 if (SizeIsNegative)
6076 Diag(Loc, diag::err_typecheck_negative_array_size);
Douglas Gregor2767ce22010-08-18 00:39:00 +00006077 else if (Oversized.getBoolValue())
6078 Diag(Loc, diag::err_array_too_large)
6079 << Oversized.toString(10);
Eli Friedman1ca48132009-02-21 00:44:51 +00006080 else
6081 Diag(Loc, diag::err_typecheck_field_variable_size);
Eli Friedman1ca48132009-02-21 00:44:51 +00006082 InvalidDecl = true;
6083 }
Reid Spencer5f016e22007-07-11 17:01:13 +00006084 }
Mike Stump1eb44332009-09-09 15:08:12 +00006085
Anders Carlsson4681ebd2009-03-22 20:18:17 +00006086 // Fields can not have abstract class types
Eli Friedman721e77d2009-12-07 00:22:08 +00006087 if (!InvalidDecl && RequireNonAbstractType(Loc, T,
6088 diag::err_abstract_type_in_decl,
6089 AbstractFieldType))
Anders Carlsson4681ebd2009-03-22 20:18:17 +00006090 InvalidDecl = true;
Mike Stump1eb44332009-09-09 15:08:12 +00006091
Eli Friedman1d954f62009-08-15 21:55:26 +00006092 bool ZeroWidth = false;
Douglas Gregor3cf538d2009-03-11 18:59:21 +00006093 // If this is declared as a bit-field, check the bit-field.
Eli Friedman721e77d2009-12-07 00:22:08 +00006094 if (!InvalidDecl && BitWidth &&
6095 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) {
Douglas Gregor3cf538d2009-03-11 18:59:21 +00006096 InvalidDecl = true;
6097 DeleteExpr(BitWidth);
6098 BitWidth = 0;
Eli Friedman1d954f62009-08-15 21:55:26 +00006099 ZeroWidth = false;
Anders Carlsson9f1e5722008-12-06 20:33:04 +00006100 }
Mike Stump1eb44332009-09-09 15:08:12 +00006101
John McCall4bde1e12010-06-04 08:34:12 +00006102 // Check that 'mutable' is consistent with the type of the declaration.
6103 if (!InvalidDecl && Mutable) {
6104 unsigned DiagID = 0;
6105 if (T->isReferenceType())
6106 DiagID = diag::err_mutable_reference;
6107 else if (T.isConstQualified())
6108 DiagID = diag::err_mutable_const;
6109
6110 if (DiagID) {
6111 SourceLocation ErrLoc = Loc;
6112 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid())
6113 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc();
6114 Diag(ErrLoc, DiagID);
6115 Mutable = false;
6116 InvalidDecl = true;
6117 }
6118 }
6119
John McCalla93c9342009-12-07 02:54:59 +00006120 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo,
Argyrios Kyrtzidisa5d82002009-08-21 00:31:54 +00006121 BitWidth, Mutable);
Chris Lattnereaaebc72009-04-25 08:06:05 +00006122 if (InvalidDecl)
6123 NewFD->setInvalidDecl();
Douglas Gregor44b43212008-12-11 16:49:14 +00006124
Douglas Gregor3cf538d2009-03-11 18:59:21 +00006125 if (PrevDecl && !isa<TagDecl>(PrevDecl)) {
6126 Diag(Loc, diag::err_duplicate_member) << II;
6127 Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
6128 NewFD->setInvalidDecl();
Douglas Gregor72de6672009-01-08 20:45:30 +00006129 }
6130
John McCall86ff3082010-02-04 22:26:26 +00006131 if (!InvalidDecl && getLangOptions().CPlusPlus) {
Eli Friedman1d954f62009-08-15 21:55:26 +00006132 CXXRecordDecl* CXXRecord = cast<CXXRecordDecl>(Record);
6133
6134 if (!T->isPODType())
6135 CXXRecord->setPOD(false);
6136 if (!ZeroWidth)
6137 CXXRecord->setEmpty(false);
Chandler Carruth1baf2f72010-08-31 05:42:40 +00006138 if (T->isReferenceType())
6139 CXXRecord->setHasTrivialConstructor(false);
Eli Friedman1d954f62009-08-15 21:55:26 +00006140
Ted Kremenek6217b802009-07-29 21:53:49 +00006141 if (const RecordType *RT = EltTy->getAs<RecordType>()) {
Douglas Gregor1f2023a2009-07-22 18:25:24 +00006142 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl());
Douglas Gregord27e50c2010-06-16 16:54:04 +00006143 if (RDecl->getDefinition()) {
6144 if (!RDecl->hasTrivialConstructor())
6145 CXXRecord->setHasTrivialConstructor(false);
Douglas Gregor1f2023a2009-07-22 18:25:24 +00006146 if (!RDecl->hasTrivialCopyConstructor())
Douglas Gregord27e50c2010-06-16 16:54:04 +00006147 CXXRecord->setHasTrivialCopyConstructor(false);
6148 if (!RDecl->hasTrivialCopyAssignment())
6149 CXXRecord->setHasTrivialCopyAssignment(false);
6150 if (!RDecl->hasTrivialDestructor())
6151 CXXRecord->setHasTrivialDestructor(false);
Douglas Gregor1f2023a2009-07-22 18:25:24 +00006152
Douglas Gregord27e50c2010-06-16 16:54:04 +00006153 // C++ 9.5p1: An object of a class with a non-trivial
6154 // constructor, a non-trivial copy constructor, a non-trivial
6155 // destructor, or a non-trivial copy assignment operator
6156 // cannot be a member of a union, nor can an array of such
6157 // objects.
6158 // TODO: C++0x alters this restriction significantly.
Argyrios Kyrtzidisdd7744d2010-08-16 17:27:08 +00006159 if (Record->isUnion() && CheckNontrivialField(NewFD))
6160 NewFD->setInvalidDecl();
Douglas Gregor1f2023a2009-07-22 18:25:24 +00006161 }
6162 }
6163 }
6164
Douglas Gregor3cf538d2009-03-11 18:59:21 +00006165 // FIXME: We need to pass in the attributes given an AST
6166 // representation, not a parser representation.
6167 if (D)
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00006168 // FIXME: What to pass instead of TUScope?
6169 ProcessDeclAttributes(TUScope, NewFD, *D);
Douglas Gregor3cf538d2009-03-11 18:59:21 +00006170
Fariborz Jahanianf6123ca2009-02-19 00:22:47 +00006171 if (T.isObjCGCWeak())
Fariborz Jahanianed7e9ef2009-02-18 18:14:41 +00006172 Diag(Loc, diag::warn_attribute_weak_on_field);
Anders Carlssonad148062008-02-16 00:29:18 +00006173
Douglas Gregor4dd55f52009-03-11 20:50:30 +00006174 NewFD->setAccess(AS);
6175
6176 // C++ [dcl.init.aggr]p1:
6177 // An aggregate is an array or a class (clause 9) with [...] no
6178 // private or protected non-static data members (clause 11).
6179 // A POD must be an aggregate.
6180 if (getLangOptions().CPlusPlus &&
6181 (AS == AS_private || AS == AS_protected)) {
6182 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record);
6183 CXXRecord->setAggregate(false);
6184 CXXRecord->setPOD(false);
6185 }
6186
Steve Naroff5912a352007-08-28 20:14:24 +00006187 return NewFD;
Reid Spencer5f016e22007-07-11 17:01:13 +00006188}
6189
Argyrios Kyrtzidisdd7744d2010-08-16 17:27:08 +00006190bool Sema::CheckNontrivialField(FieldDecl *FD) {
6191 assert(FD);
6192 assert(getLangOptions().CPlusPlus && "valid check only for C++");
6193
6194 if (FD->isInvalidDecl())
6195 return true;
6196
6197 QualType EltTy = Context.getBaseElementType(FD->getType());
6198 if (const RecordType *RT = EltTy->getAs<RecordType>()) {
6199 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl());
6200 if (RDecl->getDefinition()) {
6201 // We check for copy constructors before constructors
6202 // because otherwise we'll never get complaints about
6203 // copy constructors.
6204
6205 CXXSpecialMember member = CXXInvalid;
6206 if (!RDecl->hasTrivialCopyConstructor())
6207 member = CXXCopyConstructor;
6208 else if (!RDecl->hasTrivialConstructor())
6209 member = CXXConstructor;
6210 else if (!RDecl->hasTrivialCopyAssignment())
6211 member = CXXCopyAssignment;
6212 else if (!RDecl->hasTrivialDestructor())
6213 member = CXXDestructor;
6214
6215 if (member != CXXInvalid) {
6216 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member)
6217 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member;
6218 DiagnoseNontrivial(RT, member);
6219 return true;
6220 }
6221 }
6222 }
6223
6224 return false;
6225}
6226
Douglas Gregor1f2023a2009-07-22 18:25:24 +00006227/// DiagnoseNontrivial - Given that a class has a non-trivial
6228/// special member, figure out why.
6229void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) {
6230 QualType QT(T, 0U);
6231 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl());
6232
6233 // Check whether the member was user-declared.
6234 switch (member) {
Douglas Gregor66dd9392010-04-22 14:36:26 +00006235 case CXXInvalid:
6236 break;
6237
Anders Carlsson3b8c53b2010-04-22 05:40:53 +00006238 case CXXConstructor:
Douglas Gregor1f2023a2009-07-22 18:25:24 +00006239 if (RD->hasUserDeclaredConstructor()) {
6240 typedef CXXRecordDecl::ctor_iterator ctor_iter;
Sebastian Redl38fd4d02009-10-25 22:31:45 +00006241 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){
6242 const FunctionDecl *body = 0;
Argyrios Kyrtzidis06a54a32010-07-07 11:31:19 +00006243 ci->hasBody(body);
Anders Carlsson10dc0f82010-04-20 23:32:58 +00006244 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) {
Douglas Gregor1f2023a2009-07-22 18:25:24 +00006245 SourceLocation CtorLoc = ci->getLocation();
6246 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member;
6247 return;
6248 }
Sebastian Redl38fd4d02009-10-25 22:31:45 +00006249 }
Douglas Gregor1f2023a2009-07-22 18:25:24 +00006250
6251 assert(0 && "found no user-declared constructors");
6252 return;
6253 }
6254 break;
6255
6256 case CXXCopyConstructor:
6257 if (RD->hasUserDeclaredCopyConstructor()) {
6258 SourceLocation CtorLoc =
6259 RD->getCopyConstructor(Context, 0)->getLocation();
6260 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member;
6261 return;
6262 }
6263 break;
6264
6265 case CXXCopyAssignment:
6266 if (RD->hasUserDeclaredCopyAssignment()) {
6267 // FIXME: this should use the location of the copy
6268 // assignment, not the type.
6269 SourceLocation TyLoc = RD->getSourceRange().getBegin();
6270 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member;
6271 return;
6272 }
6273 break;
6274
6275 case CXXDestructor:
6276 if (RD->hasUserDeclaredDestructor()) {
Douglas Gregordb89f282010-07-01 22:47:18 +00006277 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation();
Douglas Gregor1f2023a2009-07-22 18:25:24 +00006278 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member;
6279 return;
6280 }
6281 break;
6282 }
6283
6284 typedef CXXRecordDecl::base_class_iterator base_iter;
6285
6286 // Virtual bases and members inhibit trivial copying/construction,
6287 // but not trivial destruction.
6288 if (member != CXXDestructor) {
6289 // Check for virtual bases. vbases includes indirect virtual bases,
6290 // so we just iterate through the direct bases.
6291 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi)
6292 if (bi->isVirtual()) {
6293 SourceLocation BaseLoc = bi->getSourceRange().getBegin();
6294 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1;
6295 return;
6296 }
6297
6298 // Check for virtual methods.
6299 typedef CXXRecordDecl::method_iterator meth_iter;
6300 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me;
6301 ++mi) {
6302 if (mi->isVirtual()) {
6303 SourceLocation MLoc = mi->getSourceRange().getBegin();
6304 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0;
6305 return;
6306 }
6307 }
6308 }
Mike Stump1eb44332009-09-09 15:08:12 +00006309
Douglas Gregor1f2023a2009-07-22 18:25:24 +00006310 bool (CXXRecordDecl::*hasTrivial)() const;
6311 switch (member) {
Anders Carlsson3b8c53b2010-04-22 05:40:53 +00006312 case CXXConstructor:
Douglas Gregor1f2023a2009-07-22 18:25:24 +00006313 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break;
6314 case CXXCopyConstructor:
6315 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break;
6316 case CXXCopyAssignment:
6317 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break;
6318 case CXXDestructor:
6319 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break;
6320 default:
6321 assert(0 && "unexpected special member"); return;
6322 }
6323
6324 // Check for nontrivial bases (and recurse).
6325 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) {
Ted Kremenek6217b802009-07-29 21:53:49 +00006326 const RecordType *BaseRT = bi->getType()->getAs<RecordType>();
Sebastian Redl9994a342009-10-25 17:03:50 +00006327 assert(BaseRT && "Don't know how to handle dependent bases");
Douglas Gregor1f2023a2009-07-22 18:25:24 +00006328 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl());
6329 if (!(BaseRecTy->*hasTrivial)()) {
6330 SourceLocation BaseLoc = bi->getSourceRange().getBegin();
6331 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member;
6332 DiagnoseNontrivial(BaseRT, member);
6333 return;
6334 }
6335 }
Mike Stump1eb44332009-09-09 15:08:12 +00006336
Douglas Gregor1f2023a2009-07-22 18:25:24 +00006337 // Check for nontrivial members (and recurse).
6338 typedef RecordDecl::field_iterator field_iter;
6339 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe;
6340 ++fi) {
Douglas Gregor5e03f9e2009-07-23 23:49:00 +00006341 QualType EltTy = Context.getBaseElementType((*fi)->getType());
Ted Kremenek6217b802009-07-29 21:53:49 +00006342 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) {
Douglas Gregor1f2023a2009-07-22 18:25:24 +00006343 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl());
6344
6345 if (!(EltRD->*hasTrivial)()) {
6346 SourceLocation FLoc = (*fi)->getLocation();
6347 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member;
6348 DiagnoseNontrivial(EltRT, member);
6349 return;
6350 }
6351 }
6352 }
6353
6354 assert(0 && "found no explanation for non-trivial member");
6355}
6356
Mike Stump1eb44332009-09-09 15:08:12 +00006357/// TranslateIvarVisibility - Translate visibility from a token ID to an
Fariborz Jahanian89204a12007-10-01 16:53:59 +00006358/// AST enum value.
Ted Kremeneka526c5c2008-01-07 19:49:32 +00006359static ObjCIvarDecl::AccessControl
Fariborz Jahanian89204a12007-10-01 16:53:59 +00006360TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) {
Steve Narofff13271f2007-09-14 23:09:53 +00006361 switch (ivarVisibility) {
Chris Lattner33d34a62008-10-12 00:28:42 +00006362 default: assert(0 && "Unknown visitibility kind");
6363 case tok::objc_private: return ObjCIvarDecl::Private;
6364 case tok::objc_public: return ObjCIvarDecl::Public;
6365 case tok::objc_protected: return ObjCIvarDecl::Protected;
6366 case tok::objc_package: return ObjCIvarDecl::Package;
Steve Narofff13271f2007-09-14 23:09:53 +00006367 }
6368}
6369
Mike Stump1eb44332009-09-09 15:08:12 +00006370/// ActOnIvar - Each ivar field of an objective-c class is passed into this
Fariborz Jahanian45bc03f2008-04-11 16:55:42 +00006371/// in order to create an IvarDecl object for it.
John McCalld226f652010-08-21 09:40:31 +00006372Decl *Sema::ActOnIvar(Scope *S,
Mike Stump1eb44332009-09-09 15:08:12 +00006373 SourceLocation DeclStart,
John McCalld226f652010-08-21 09:40:31 +00006374 Decl *IntfDecl,
Chris Lattnerb28317a2009-03-28 19:18:32 +00006375 Declarator &D, ExprTy *BitfieldWidth,
6376 tok::ObjCKeywordKind Visibility) {
Mike Stump1eb44332009-09-09 15:08:12 +00006377
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00006378 IdentifierInfo *II = D.getIdentifier();
6379 Expr *BitWidth = (Expr*)BitfieldWidth;
6380 SourceLocation Loc = DeclStart;
6381 if (II) Loc = D.getIdentifierLoc();
Mike Stump1eb44332009-09-09 15:08:12 +00006382
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00006383 // FIXME: Unnamed fields can be handled in various different ways, for
6384 // example, unnamed unions inject all members into the struct namespace!
Mike Stump1eb44332009-09-09 15:08:12 +00006385
John McCallbf1a0282010-06-04 23:28:52 +00006386 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
6387 QualType T = TInfo->getType();
Mike Stump1eb44332009-09-09 15:08:12 +00006388
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00006389 if (BitWidth) {
Steve Naroff63359c82009-02-20 17:57:11 +00006390 // 6.7.2.1p3, 6.7.2.1p4
Chris Lattner24793662009-03-05 22:45:59 +00006391 if (VerifyBitField(Loc, II, T, BitWidth)) {
Chris Lattnereaaebc72009-04-25 08:06:05 +00006392 D.setInvalidType();
Chris Lattner24793662009-03-05 22:45:59 +00006393 DeleteExpr(BitWidth);
6394 BitWidth = 0;
6395 }
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00006396 } else {
6397 // Not a bitfield.
Mike Stump1eb44332009-09-09 15:08:12 +00006398
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00006399 // validate II.
Mike Stump1eb44332009-09-09 15:08:12 +00006400
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00006401 }
Fariborz Jahanian0b7bc8e2010-04-26 22:07:03 +00006402 if (T->isReferenceType()) {
6403 Diag(Loc, diag::err_ivar_reference_type);
6404 D.setInvalidType();
6405 }
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00006406 // C99 6.7.2.1p8: A member of a structure or union may have any type other
6407 // than a variably modified type.
Fariborz Jahanian0b7bc8e2010-04-26 22:07:03 +00006408 else if (T->isVariablyModifiedType()) {
Anders Carlsson96e05bc2008-12-07 00:20:55 +00006409 Diag(Loc, diag::err_typecheck_ivar_variable_size);
Chris Lattnereaaebc72009-04-25 08:06:05 +00006410 D.setInvalidType();
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00006411 }
Mike Stump1eb44332009-09-09 15:08:12 +00006412
Ted Kremenekb8db21d2008-07-23 18:04:17 +00006413 // Get the visibility (access control) for this ivar.
Mike Stump1eb44332009-09-09 15:08:12 +00006414 ObjCIvarDecl::AccessControl ac =
Ted Kremenekb8db21d2008-07-23 18:04:17 +00006415 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility)
6416 : ObjCIvarDecl::None;
Fariborz Jahanian496b5a82009-06-05 18:16:35 +00006417 // Must set ivar's DeclContext to its enclosing interface.
John McCalld226f652010-08-21 09:40:31 +00006418 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(IntfDecl);
Daniel Dunbara19331f2010-04-02 18:29:09 +00006419 ObjCContainerDecl *EnclosingContext;
Mike Stump1eb44332009-09-09 15:08:12 +00006420 if (ObjCImplementationDecl *IMPDecl =
Fariborz Jahanian496b5a82009-06-05 18:16:35 +00006421 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) {
Fariborz Jahanian000835d2010-08-23 18:51:39 +00006422 if (!LangOpts.ObjCNonFragileABI2) {
Fariborz Jahanian496b5a82009-06-05 18:16:35 +00006423 // Case of ivar declared in an implementation. Context is that of its class.
Fariborz Jahanian000835d2010-08-23 18:51:39 +00006424 EnclosingContext = IMPDecl->getClassInterface();
6425 assert(EnclosingContext && "Implementation has no class interface!");
6426 }
6427 else
6428 EnclosingContext = EnclosingDecl;
Fariborz Jahanian0bd04592010-04-06 22:43:48 +00006429 } else {
6430 if (ObjCCategoryDecl *CDecl =
6431 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) {
6432 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) {
6433 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension();
John McCalld226f652010-08-21 09:40:31 +00006434 return 0;
Fariborz Jahanian0bd04592010-04-06 22:43:48 +00006435 }
6436 }
Daniel Dunbara19331f2010-04-02 18:29:09 +00006437 EnclosingContext = EnclosingDecl;
Fariborz Jahanian0bd04592010-04-06 22:43:48 +00006438 }
Mike Stump1eb44332009-09-09 15:08:12 +00006439
Ted Kremenekb8db21d2008-07-23 18:04:17 +00006440 // Construct the decl.
Mike Stump1eb44332009-09-09 15:08:12 +00006441 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context,
Argyrios Kyrtzidisa1d56622009-08-19 01:27:57 +00006442 EnclosingContext, Loc, II, T,
John McCalla93c9342009-12-07 02:54:59 +00006443 TInfo, ac, (Expr *)BitfieldWidth);
Mike Stump1eb44332009-09-09 15:08:12 +00006444
Douglas Gregor72de6672009-01-08 20:45:30 +00006445 if (II) {
Douglas Gregorc83c6872010-04-15 22:33:43 +00006446 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName,
John McCall7d384dd2009-11-18 07:57:50 +00006447 ForRedeclaration);
Fariborz Jahanian496b5a82009-06-05 18:16:35 +00006448 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S)
Douglas Gregor72de6672009-01-08 20:45:30 +00006449 && !isa<TagDecl>(PrevDecl)) {
6450 Diag(Loc, diag::err_duplicate_member) << II;
6451 Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
6452 NewID->setInvalidDecl();
6453 }
6454 }
6455
Ted Kremenekb8db21d2008-07-23 18:04:17 +00006456 // Process attributes attached to the ivar.
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00006457 ProcessDeclAttributes(S, NewID, D);
Mike Stump1eb44332009-09-09 15:08:12 +00006458
Chris Lattnereaaebc72009-04-25 08:06:05 +00006459 if (D.isInvalidType())
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00006460 NewID->setInvalidDecl();
Ted Kremenekb8db21d2008-07-23 18:04:17 +00006461
Douglas Gregor72de6672009-01-08 20:45:30 +00006462 if (II) {
6463 // FIXME: When interfaces are DeclContexts, we'll need to add
6464 // these to the interface.
John McCalld226f652010-08-21 09:40:31 +00006465 S->AddDecl(NewID);
Douglas Gregor72de6672009-01-08 20:45:30 +00006466 IdResolver.AddDecl(NewID);
6467 }
6468
John McCalld226f652010-08-21 09:40:31 +00006469 return NewID;
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00006470}
6471
Fariborz Jahaniand097be82010-08-23 22:46:52 +00006472/// ActOnLastBitfield - This routine handles synthesized bitfields rules for
6473/// class and class extensions. For every class @interface and class
6474/// extension @interface, if the last ivar is a bitfield of any type,
6475/// then add an implicit `char :0` ivar to the end of that interface.
6476void Sema::ActOnLastBitfield(SourceLocation DeclLoc, Decl *EnclosingDecl,
6477 llvm::SmallVectorImpl<Decl *> &AllIvarDecls) {
6478 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty())
6479 return;
6480
6481 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1];
6482 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl);
6483
6484 if (!Ivar->isBitField())
6485 return;
6486 uint64_t BitFieldSize =
6487 Ivar->getBitWidth()->EvaluateAsInt(Context).getZExtValue();
6488 if (BitFieldSize == 0)
6489 return;
6490 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl);
6491 if (!ID) {
6492 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) {
6493 if (!CD->IsClassExtension())
6494 return;
6495 }
6496 // No need to add this to end of @implementation.
6497 else
6498 return;
6499 }
6500 // All conditions are met. Add a new bitfield to the tail end of ivars.
6501 llvm::APInt Zero(Context.getTypeSize(Context.CharTy), 0);
Argyrios Kyrtzidis9996a7f2010-08-28 09:06:06 +00006502 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.CharTy, DeclLoc);
Fariborz Jahaniand097be82010-08-23 22:46:52 +00006503
6504 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(EnclosingDecl),
6505 DeclLoc, 0,
6506 Context.CharTy,
6507 Context.CreateTypeSourceInfo(Context.CharTy),
6508 ObjCIvarDecl::Private, BW,
6509 true);
6510 AllIvarDecls.push_back(Ivar);
6511}
6512
Fariborz Jahanian9d048ff2007-09-29 00:54:24 +00006513void Sema::ActOnFields(Scope* S,
John McCalld226f652010-08-21 09:40:31 +00006514 SourceLocation RecLoc, Decl *EnclosingDecl,
6515 Decl **Fields, unsigned NumFields,
Daniel Dunbar1bfe1c22008-10-03 02:03:53 +00006516 SourceLocation LBrac, SourceLocation RBrac,
Daniel Dunbar7d076642008-10-03 17:33:35 +00006517 AttributeList *Attr) {
Steve Naroff74216642007-09-14 22:20:54 +00006518 assert(EnclosingDecl && "missing record or interface decl");
Mike Stump1eb44332009-09-09 15:08:12 +00006519
Chris Lattner1829a6d2009-02-23 22:00:08 +00006520 // If the decl this is being inserted into is invalid, then it may be a
6521 // redeclaration or some other bogus case. Don't try to add fields to it.
6522 if (EnclosingDecl->isInvalidDecl()) {
6523 // FIXME: Deallocate fields?
6524 return;
6525 }
6526
Mike Stump1eb44332009-09-09 15:08:12 +00006527
Reid Spencer5f016e22007-07-11 17:01:13 +00006528 // Verify that all the fields are okay.
6529 unsigned NumNamedMembers = 0;
6530 llvm::SmallVector<FieldDecl*, 32> RecFields;
Douglas Gregor6b3945f2009-01-07 19:46:03 +00006531
Chris Lattner1829a6d2009-02-23 22:00:08 +00006532 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl);
Reid Spencer5f016e22007-07-11 17:01:13 +00006533 for (unsigned i = 0; i != NumFields; ++i) {
John McCalld226f652010-08-21 09:40:31 +00006534 FieldDecl *FD = cast<FieldDecl>(Fields[i]);
Mike Stump1eb44332009-09-09 15:08:12 +00006535
Reid Spencer5f016e22007-07-11 17:01:13 +00006536 // Get the type for the field.
Chris Lattner02c642e2007-07-31 21:33:24 +00006537 Type *FDTy = FD->getType().getTypePtr();
Douglas Gregor6b3945f2009-01-07 19:46:03 +00006538
Douglas Gregor72de6672009-01-08 20:45:30 +00006539 if (!FD->isAnonymousStructOrUnion()) {
Douglas Gregor6b3945f2009-01-07 19:46:03 +00006540 // Remember all fields written by the user.
6541 RecFields.push_back(FD);
6542 }
Mike Stump1eb44332009-09-09 15:08:12 +00006543
Chris Lattner24793662009-03-05 22:45:59 +00006544 // If the field is already invalid for some reason, don't emit more
6545 // diagnostics about it.
Eli Friedman721e77d2009-12-07 00:22:08 +00006546 if (FD->isInvalidDecl()) {
6547 EnclosingDecl->setInvalidDecl();
Chris Lattner24793662009-03-05 22:45:59 +00006548 continue;
Eli Friedman721e77d2009-12-07 00:22:08 +00006549 }
Mike Stump1eb44332009-09-09 15:08:12 +00006550
Douglas Gregore7450f52009-03-24 19:52:54 +00006551 // C99 6.7.2.1p2:
6552 // A structure or union shall not contain a member with
6553 // incomplete or function type (hence, a structure shall not
6554 // contain an instance of itself, but may contain a pointer to
6555 // an instance of itself), except that the last member of a
6556 // structure with more than one named member may have incomplete
6557 // array type; such a structure (and any union containing,
6558 // possibly recursively, a member that is such a structure)
6559 // shall not be a member of a structure or an element of an
6560 // array.
Chris Lattner02c642e2007-07-31 21:33:24 +00006561 if (FDTy->isFunctionType()) {
Douglas Gregore7450f52009-03-24 19:52:54 +00006562 // Field declared as a function.
Chris Lattnerf3a41af2008-11-20 06:38:18 +00006563 Diag(FD->getLocation(), diag::err_field_declared_as_function)
Chris Lattnerd9d22dd2008-11-24 05:29:24 +00006564 << FD->getDeclName();
Steve Naroff74216642007-09-14 22:20:54 +00006565 FD->setInvalidDecl();
6566 EnclosingDecl->setInvalidDecl();
Reid Spencer5f016e22007-07-11 17:01:13 +00006567 continue;
Douglas Gregore7450f52009-03-24 19:52:54 +00006568 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 &&
6569 Record && Record->isStruct()) {
6570 // Flexible array member.
6571 if (NumNamedMembers < 1) {
Chris Lattnerf3a41af2008-11-20 06:38:18 +00006572 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct)
Chris Lattnerd9d22dd2008-11-24 05:29:24 +00006573 << FD->getDeclName();
Steve Naroff74216642007-09-14 22:20:54 +00006574 FD->setInvalidDecl();
6575 EnclosingDecl->setInvalidDecl();
Reid Spencer5f016e22007-07-11 17:01:13 +00006576 continue;
6577 }
Fariborz Jahanian4142ceb2010-05-26 20:19:07 +00006578 if (!FD->getType()->isDependentType() &&
6579 !Context.getBaseElementType(FD->getType())->isPODType()) {
6580 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type)
Fariborz Jahanian2c0a5402010-05-26 20:46:24 +00006581 << FD->getDeclName() << FD->getType();
Fariborz Jahanian4142ceb2010-05-26 20:19:07 +00006582 FD->setInvalidDecl();
6583 EnclosingDecl->setInvalidDecl();
6584 continue;
6585 }
6586
Reid Spencer5f016e22007-07-11 17:01:13 +00006587 // Okay, we have a legal flexible array member at the end of the struct.
Fariborz Jahaniane267ab62007-09-14 16:27:55 +00006588 if (Record)
6589 Record->setHasFlexibleArrayMember(true);
Douglas Gregore7450f52009-03-24 19:52:54 +00006590 } else if (!FDTy->isDependentType() &&
Mike Stump1eb44332009-09-09 15:08:12 +00006591 RequireCompleteType(FD->getLocation(), FD->getType(),
Douglas Gregore7450f52009-03-24 19:52:54 +00006592 diag::err_field_incomplete)) {
6593 // Incomplete type
6594 FD->setInvalidDecl();
6595 EnclosingDecl->setInvalidDecl();
6596 continue;
Ted Kremenek6217b802009-07-29 21:53:49 +00006597 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) {
Reid Spencer5f016e22007-07-11 17:01:13 +00006598 if (FDTTy->getDecl()->hasFlexibleArrayMember()) {
6599 // If this is a member of a union, then entire union becomes "flexible".
Argyrios Kyrtzidis39ba4ae2008-06-09 23:19:58 +00006600 if (Record && Record->isUnion()) {
Reid Spencer5f016e22007-07-11 17:01:13 +00006601 Record->setHasFlexibleArrayMember(true);
6602 } else {
6603 // If this is a struct/class and this is not the last element, reject
6604 // it. Note that GCC supports variable sized arrays in the middle of
6605 // structures.
Douglas Gregore4f3e062009-03-06 23:41:27 +00006606 if (i != NumFields-1)
6607 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct)
Chris Lattner740782a2009-04-25 18:52:45 +00006608 << FD->getDeclName() << FD->getType();
Douglas Gregore4f3e062009-03-06 23:41:27 +00006609 else {
6610 // We support flexible arrays at the end of structs in
6611 // other structs as an extension.
6612 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct)
6613 << FD->getDeclName();
6614 if (Record)
6615 Record->setHasFlexibleArrayMember(true);
Reid Spencer5f016e22007-07-11 17:01:13 +00006616 }
Reid Spencer5f016e22007-07-11 17:01:13 +00006617 }
6618 }
Fariborz Jahanian082b02e2009-07-08 01:18:33 +00006619 if (Record && FDTTy->getDecl()->hasObjectMember())
6620 Record->setHasObjectMember(true);
John McCallc12c5bb2010-05-15 11:32:37 +00006621 } else if (FDTy->isObjCObjectType()) {
Douglas Gregore7450f52009-03-24 19:52:54 +00006622 /// A field cannot be an Objective-c object
Steve Naroffccef3712009-02-20 22:59:16 +00006623 Diag(FD->getLocation(), diag::err_statically_allocated_object);
Fariborz Jahaniane7f64cc2007-10-12 22:10:42 +00006624 FD->setInvalidDecl();
6625 EnclosingDecl->setInvalidDecl();
6626 continue;
Mike Stumpac5fc7c2009-08-04 21:02:39 +00006627 } else if (getLangOptions().ObjC1 &&
6628 getLangOptions().getGCMode() != LangOptions::NonGC &&
6629 Record &&
6630 (FD->getType()->isObjCObjectPointerType() ||
6631 FD->getType().isObjCGCStrong()))
Fariborz Jahanian082b02e2009-07-08 01:18:33 +00006632 Record->setHasObjectMember(true);
Fariborz Jahanian55bcace2010-06-15 22:44:06 +00006633 else if (Context.getAsArrayType(FD->getType())) {
6634 QualType BaseType = Context.getBaseElementType(FD->getType());
6635 if (Record && BaseType->isRecordType() &&
6636 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember())
6637 Record->setHasObjectMember(true);
6638 }
Reid Spencer5f016e22007-07-11 17:01:13 +00006639 // Keep track of the number of named members.
Douglas Gregor72de6672009-01-08 20:45:30 +00006640 if (FD->getIdentifier())
Reid Spencer5f016e22007-07-11 17:01:13 +00006641 ++NumNamedMembers;
Reid Spencer5f016e22007-07-11 17:01:13 +00006642 }
Sebastian Redl64b45f72009-01-05 20:52:13 +00006643
Reid Spencer5f016e22007-07-11 17:01:13 +00006644 // Okay, we successfully defined 'Record'.
Chris Lattnere1e79852008-02-06 00:51:33 +00006645 if (Record) {
Douglas Gregor838db382010-02-11 01:19:42 +00006646 Record->completeDefinition();
Chris Lattnere1e79852008-02-06 00:51:33 +00006647 } else {
Jay Foadbeaaccd2009-05-21 09:52:38 +00006648 ObjCIvarDecl **ClsFields =
6649 reinterpret_cast<ObjCIvarDecl**>(RecFields.data());
Fariborz Jahanian60f8c862008-12-13 20:28:25 +00006650 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) {
Chris Lattner38af2de2009-02-20 21:35:13 +00006651 ID->setLocEnd(RBrac);
Fariborz Jahanian496b5a82009-06-05 18:16:35 +00006652 // Add ivar's to class's DeclContext.
6653 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) {
6654 ClsFields[i]->setLexicalDeclContext(ID);
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00006655 ID->addDecl(ClsFields[i]);
Fariborz Jahanian496b5a82009-06-05 18:16:35 +00006656 }
Fariborz Jahanian3281eff2008-12-16 01:08:35 +00006657 // Must enforce the rule that ivars in the base classes may not be
6658 // duplicates.
Fariborz Jahanianf914b972010-02-23 23:41:11 +00006659 if (ID->getSuperClass())
6660 DiagnoseDuplicateIvars(ID, ID->getSuperClass());
Mike Stump1eb44332009-09-09 15:08:12 +00006661 } else if (ObjCImplementationDecl *IMPDecl =
Chris Lattner1829a6d2009-02-23 22:00:08 +00006662 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) {
Ted Kremeneka526c5c2008-01-07 19:49:32 +00006663 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl");
Fariborz Jahanian496b5a82009-06-05 18:16:35 +00006664 for (unsigned I = 0, N = RecFields.size(); I != N; ++I)
6665 // Ivar declared in @implementation never belongs to the implementation.
6666 // Only it is in implementation's lexical context.
Douglas Gregor8f36aba2009-04-23 03:23:08 +00006667 ClsFields[I]->setLexicalDeclContext(IMPDecl);
Fariborz Jahanian3a3ca1b2007-10-31 18:48:14 +00006668 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac);
Fariborz Jahanian83c481a2010-02-22 23:04:20 +00006669 } else if (ObjCCategoryDecl *CDecl =
6670 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) {
Fariborz Jahanian0bd04592010-04-06 22:43:48 +00006671 // case of ivars in class extension; all other cases have been
6672 // reported as errors elsewhere.
6673 // FIXME. Class extension does not have a LocEnd field.
6674 // CDecl->setLocEnd(RBrac);
6675 // Add ivar's to class extension's DeclContext.
6676 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) {
6677 ClsFields[i]->setLexicalDeclContext(CDecl);
6678 CDecl->addDecl(ClsFields[i]);
Fariborz Jahanian83c481a2010-02-22 23:04:20 +00006679 }
Fariborz Jahaniand0b90bf2007-09-26 18:27:25 +00006680 }
Fariborz Jahanianb04a0212007-09-14 21:08:27 +00006681 }
Daniel Dunbar7d076642008-10-03 17:33:35 +00006682
6683 if (Attr)
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00006684 ProcessDeclAttributeList(S, Record, Attr);
Eli Friedmanaa8b0d12010-08-05 06:57:20 +00006685
6686 // If there's a #pragma GCC visibility in scope, and this isn't a subclass,
6687 // set the visibility of this record.
6688 if (Record && !Record->getDeclContext()->isRecord())
6689 AddPushedVisibilityAttribute(Record);
Reid Spencer5f016e22007-07-11 17:01:13 +00006690}
6691
Douglas Gregor677e4fe2010-02-01 23:36:03 +00006692/// \brief Determine whether the given integral value is representable within
6693/// the given type T.
6694static bool isRepresentableIntegerValue(ASTContext &Context,
6695 llvm::APSInt &Value,
6696 QualType T) {
Douglas Gregor9d3347a2010-06-16 00:35:25 +00006697 assert(T->isIntegralType(Context) && "Integral type required!");
Douglas Gregoraf68d4e2010-04-15 15:53:31 +00006698 unsigned BitWidth = Context.getIntWidth(T);
Douglas Gregor677e4fe2010-02-01 23:36:03 +00006699
6700 if (Value.isUnsigned() || Value.isNonNegative())
6701 return Value.getActiveBits() < BitWidth;
6702
6703 return Value.getMinSignedBits() <= BitWidth;
6704}
6705
6706// \brief Given an integral type, return the next larger integral type
6707// (or a NULL type of no such type exists).
6708static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) {
6709 // FIXME: Int128/UInt128 support, which also needs to be introduced into
6710 // enum checking below.
Douglas Gregor9d3347a2010-06-16 00:35:25 +00006711 assert(T->isIntegralType(Context) && "Integral type required!");
Douglas Gregor677e4fe2010-02-01 23:36:03 +00006712 const unsigned NumTypes = 4;
6713 QualType SignedIntegralTypes[NumTypes] = {
6714 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy
6715 };
6716 QualType UnsignedIntegralTypes[NumTypes] = {
6717 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy,
6718 Context.UnsignedLongLongTy
6719 };
6720
6721 unsigned BitWidth = Context.getTypeSize(T);
6722 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes
6723 : UnsignedIntegralTypes;
6724 for (unsigned I = 0; I != NumTypes; ++I)
6725 if (Context.getTypeSize(Types[I]) > BitWidth)
6726 return Types[I];
6727
6728 return QualType();
6729}
6730
Douglas Gregor879fd492009-03-17 19:05:46 +00006731EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum,
6732 EnumConstantDecl *LastEnumConst,
6733 SourceLocation IdLoc,
6734 IdentifierInfo *Id,
John McCall9ae2f072010-08-23 23:25:46 +00006735 Expr *Val) {
Douglas Gregor677e4fe2010-02-01 23:36:03 +00006736 unsigned IntWidth = Context.Target.getIntWidth();
6737 llvm::APSInt EnumVal(IntWidth);
Douglas Gregor879fd492009-03-17 19:05:46 +00006738 QualType EltTy;
Douglas Gregor4912c342009-11-06 00:03:12 +00006739 if (Val) {
Douglas Gregor9b9edd62010-03-02 17:53:14 +00006740 if (Enum->isDependentType() || Val->isTypeDependent())
Douglas Gregor4912c342009-11-06 00:03:12 +00006741 EltTy = Context.DependentTy;
6742 else {
Douglas Gregor4912c342009-11-06 00:03:12 +00006743 // C99 6.7.2.2p2: Make sure we have an integer constant expression.
6744 SourceLocation ExpLoc;
Douglas Gregor9b9edd62010-03-02 17:53:14 +00006745 if (!Val->isValueDependent() &&
6746 VerifyIntegerConstantExpression(Val, &EnumVal)) {
Douglas Gregor4912c342009-11-06 00:03:12 +00006747 Val = 0;
Douglas Gregor677e4fe2010-02-01 23:36:03 +00006748 } else {
6749 if (!getLangOptions().CPlusPlus) {
6750 // C99 6.7.2.2p2:
6751 // The expression that defines the value of an enumeration constant
6752 // shall be an integer constant expression that has a value
6753 // representable as an int.
6754
6755 // Complain if the value is not representable in an int.
6756 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy))
6757 Diag(IdLoc, diag::ext_enum_value_not_int)
6758 << EnumVal.toString(10) << Val->getSourceRange()
Douglas Gregor19c15252010-02-17 22:40:11 +00006759 << (EnumVal.isUnsigned() || EnumVal.isNonNegative());
Douglas Gregor677e4fe2010-02-01 23:36:03 +00006760 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) {
6761 // Force the type of the expression to 'int'.
John McCall2de56d12010-08-25 11:45:40 +00006762 ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast);
Douglas Gregor677e4fe2010-02-01 23:36:03 +00006763 }
6764 }
6765
6766 // C++0x [dcl.enum]p5:
6767 // If the underlying type is not fixed, the type of each enumerator
6768 // is the type of its initializing value:
6769 // - If an initializer is specified for an enumerator, the
6770 // initializing value has the same type as the expression.
Douglas Gregor4912c342009-11-06 00:03:12 +00006771 EltTy = Val->getType();
6772 }
Douglas Gregor879fd492009-03-17 19:05:46 +00006773 }
6774 }
Mike Stump1eb44332009-09-09 15:08:12 +00006775
Douglas Gregor879fd492009-03-17 19:05:46 +00006776 if (!Val) {
Eli Friedmaned0716b2009-12-11 01:34:50 +00006777 if (Enum->isDependentType())
6778 EltTy = Context.DependentTy;
Douglas Gregor677e4fe2010-02-01 23:36:03 +00006779 else if (!LastEnumConst) {
6780 // C++0x [dcl.enum]p5:
6781 // If the underlying type is not fixed, the type of each enumerator
6782 // is the type of its initializing value:
6783 // - If no initializer is specified for the first enumerator, the
6784 // initializing value has an unspecified integral type.
6785 //
6786 // GCC uses 'int' for its unspecified integral type, as does
6787 // C99 6.7.2.2p3.
6788 EltTy = Context.IntTy;
6789 } else {
Douglas Gregor879fd492009-03-17 19:05:46 +00006790 // Assign the last value + 1.
6791 EnumVal = LastEnumConst->getInitVal();
6792 ++EnumVal;
Douglas Gregor677e4fe2010-02-01 23:36:03 +00006793 EltTy = LastEnumConst->getType();
Douglas Gregor879fd492009-03-17 19:05:46 +00006794
6795 // Check for overflow on increment.
Douglas Gregor677e4fe2010-02-01 23:36:03 +00006796 if (EnumVal < LastEnumConst->getInitVal()) {
6797 // C++0x [dcl.enum]p5:
6798 // If the underlying type is not fixed, the type of each enumerator
6799 // is the type of its initializing value:
6800 //
6801 // - Otherwise the type of the initializing value is the same as
6802 // the type of the initializing value of the preceding enumerator
6803 // unless the incremented value is not representable in that type,
6804 // in which case the type is an unspecified integral type
6805 // sufficient to contain the incremented value. If no such type
6806 // exists, the program is ill-formed.
6807 QualType T = getNextLargerIntegralType(Context, EltTy);
6808 if (T.isNull()) {
6809 // There is no integral type larger enough to represent this
6810 // value. Complain, then allow the value to wrap around.
6811 EnumVal = LastEnumConst->getInitVal();
6812 EnumVal.zext(EnumVal.getBitWidth() * 2);
6813 Diag(IdLoc, diag::warn_enumerator_too_large)
6814 << EnumVal.toString(10);
6815 } else {
6816 EltTy = T;
6817 }
6818
6819 // Retrieve the last enumerator's value, extent that type to the
6820 // type that is supposed to be large enough to represent the incremented
6821 // value, then increment.
6822 EnumVal = LastEnumConst->getInitVal();
6823 EnumVal.setIsSigned(EltTy->isSignedIntegerType());
Douglas Gregoraf68d4e2010-04-15 15:53:31 +00006824 EnumVal.zextOrTrunc(Context.getIntWidth(EltTy));
Douglas Gregor677e4fe2010-02-01 23:36:03 +00006825 ++EnumVal;
6826
6827 // If we're not in C++, diagnose the overflow of enumerator values,
6828 // which in C99 means that the enumerator value is not representable in
6829 // an int (C99 6.7.2.2p2). However, we support GCC's extension that
6830 // permits enumerator values that are representable in some larger
6831 // integral type.
6832 if (!getLangOptions().CPlusPlus && !T.isNull())
6833 Diag(IdLoc, diag::warn_enum_value_overflow);
6834 } else if (!getLangOptions().CPlusPlus &&
6835 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) {
6836 // Enforce C99 6.7.2.2p2 even when we compute the next value.
6837 Diag(IdLoc, diag::ext_enum_value_not_int)
6838 << EnumVal.toString(10) << 1;
6839 }
Douglas Gregor879fd492009-03-17 19:05:46 +00006840 }
6841 }
Mike Stump1eb44332009-09-09 15:08:12 +00006842
Douglas Gregor9b9edd62010-03-02 17:53:14 +00006843 if (!EltTy->isDependentType()) {
Douglas Gregor677e4fe2010-02-01 23:36:03 +00006844 // Make the enumerator value match the signedness and size of the
6845 // enumerator's type.
Douglas Gregoraf68d4e2010-04-15 15:53:31 +00006846 EnumVal.zextOrTrunc(Context.getIntWidth(EltTy));
Douglas Gregor677e4fe2010-02-01 23:36:03 +00006847 EnumVal.setIsSigned(EltTy->isSignedIntegerType());
6848 }
Douglas Gregor4912c342009-11-06 00:03:12 +00006849
Douglas Gregor879fd492009-03-17 19:05:46 +00006850 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy,
Mike Stump1eb44332009-09-09 15:08:12 +00006851 Val, EnumVal);
Douglas Gregor879fd492009-03-17 19:05:46 +00006852}
6853
6854
John McCalld226f652010-08-21 09:40:31 +00006855Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl,
6856 Decl *lastEnumConst,
Chris Lattnerb28317a2009-03-28 19:18:32 +00006857 SourceLocation IdLoc,
6858 IdentifierInfo *Id,
6859 SourceLocation EqualLoc, ExprTy *val) {
John McCalld226f652010-08-21 09:40:31 +00006860 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl);
Reid Spencer5f016e22007-07-11 17:01:13 +00006861 EnumConstantDecl *LastEnumConst =
John McCalld226f652010-08-21 09:40:31 +00006862 cast_or_null<EnumConstantDecl>(lastEnumConst);
Reid Spencer5f016e22007-07-11 17:01:13 +00006863 Expr *Val = static_cast<Expr*>(val);
6864
Chris Lattner31e05722007-08-26 06:24:45 +00006865 // The scope passed in may not be a decl scope. Zip up the scope tree until
6866 // we find one that is.
Douglas Gregor1a0d31a2009-01-12 18:45:55 +00006867 S = getNonFieldDeclScope(S);
Mike Stump1eb44332009-09-09 15:08:12 +00006868
Reid Spencer5f016e22007-07-11 17:01:13 +00006869 // Verify that there isn't already something declared with this name in this
6870 // scope.
Douglas Gregorc83c6872010-04-15 22:33:43 +00006871 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName,
Douglas Gregore39fe722010-01-19 06:06:57 +00006872 ForRedeclaration);
Douglas Gregorf57172b2008-12-08 18:40:42 +00006873 if (PrevDecl && PrevDecl->isTemplateParameter()) {
Douglas Gregor72c3f312008-12-05 18:15:24 +00006874 // Maybe we will complain about the shadowed template parameter.
6875 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl);
6876 // Just pretend that we didn't see the previous declaration.
6877 PrevDecl = 0;
6878 }
6879
6880 if (PrevDecl) {
Argyrios Kyrtzidis0ff12f02008-07-16 21:01:53 +00006881 // When in C++, we may get a TagDecl with the same name; in this case the
6882 // enum constant will 'hide' the tag.
6883 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) &&
6884 "Received TagDecl when not in C++!");
Argyrios Kyrtzidis15a12d02008-09-09 21:18:04 +00006885 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) {
Reid Spencer5f016e22007-07-11 17:01:13 +00006886 if (isa<EnumConstantDecl>(PrevDecl))
Chris Lattner3c73c412008-11-19 08:23:25 +00006887 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id;
Reid Spencer5f016e22007-07-11 17:01:13 +00006888 else
Chris Lattner3c73c412008-11-19 08:23:25 +00006889 Diag(IdLoc, diag::err_redefinition) << Id;
Chris Lattner5f4a6822008-11-23 23:12:31 +00006890 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
John McCalld226f652010-08-21 09:40:31 +00006891 return 0;
Reid Spencer5f016e22007-07-11 17:01:13 +00006892 }
6893 }
6894
Douglas Gregor879fd492009-03-17 19:05:46 +00006895 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst,
John McCall9ae2f072010-08-23 23:25:46 +00006896 IdLoc, Id, Val);
Chris Lattner421a23d2007-08-27 21:16:18 +00006897
Reid Spencer5f016e22007-07-11 17:01:13 +00006898 // Register this decl in the current scope stack.
John McCall92f88312010-01-23 00:46:32 +00006899 if (New) {
6900 New->setAccess(TheEnumDecl->getAccess());
Douglas Gregor879fd492009-03-17 19:05:46 +00006901 PushOnScopeChains(New, S);
John McCall92f88312010-01-23 00:46:32 +00006902 }
Douglas Gregor45579f52008-12-17 02:04:30 +00006903
John McCalld226f652010-08-21 09:40:31 +00006904 return New;
Reid Spencer5f016e22007-07-11 17:01:13 +00006905}
6906
Mike Stumpc6e35aa2009-05-16 07:06:02 +00006907void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc,
John McCalld226f652010-08-21 09:40:31 +00006908 SourceLocation RBraceLoc, Decl *EnumDeclX,
6909 Decl **Elements, unsigned NumElements,
Edward O'Callaghanfee13812009-08-08 14:36:57 +00006910 Scope *S, AttributeList *Attr) {
John McCalld226f652010-08-21 09:40:31 +00006911 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX);
Douglas Gregor074149e2009-01-05 19:45:36 +00006912 QualType EnumType = Context.getTypeDeclType(Enum);
Edward O'Callaghanfee13812009-08-08 14:36:57 +00006913
6914 if (Attr)
6915 ProcessDeclAttributeList(S, Enum, Attr);
Mike Stump1eb44332009-09-09 15:08:12 +00006916
Eli Friedmaned0716b2009-12-11 01:34:50 +00006917 if (Enum->isDependentType()) {
6918 for (unsigned i = 0; i != NumElements; ++i) {
6919 EnumConstantDecl *ECD =
John McCalld226f652010-08-21 09:40:31 +00006920 cast_or_null<EnumConstantDecl>(Elements[i]);
Eli Friedmaned0716b2009-12-11 01:34:50 +00006921 if (!ECD) continue;
6922
6923 ECD->setType(EnumType);
6924 }
6925
John McCall1b5a6182010-05-06 08:49:23 +00006926 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0);
Eli Friedmaned0716b2009-12-11 01:34:50 +00006927 return;
6928 }
6929
Chris Lattnere37f0be2007-08-28 05:10:31 +00006930 // TODO: If the result value doesn't fit in an int, it must be a long or long
6931 // long value. ISO C does not support this, but GCC does as an extension,
6932 // emit a warning.
Chris Lattner98be4942008-03-05 18:54:05 +00006933 unsigned IntWidth = Context.Target.getIntWidth();
Edward O'Callaghanfee13812009-08-08 14:36:57 +00006934 unsigned CharWidth = Context.Target.getCharWidth();
6935 unsigned ShortWidth = Context.Target.getShortWidth();
Mike Stump1eb44332009-09-09 15:08:12 +00006936
Chris Lattnerac609682007-08-28 06:15:15 +00006937 // Verify that all the values are okay, compute the size of the values, and
6938 // reverse the list.
6939 unsigned NumNegativeBits = 0;
6940 unsigned NumPositiveBits = 0;
Mike Stump1eb44332009-09-09 15:08:12 +00006941
Chris Lattnerac609682007-08-28 06:15:15 +00006942 // Keep track of whether all elements have type int.
6943 bool AllElementsInt = true;
Mike Stump1eb44332009-09-09 15:08:12 +00006944
Reid Spencer5f016e22007-07-11 17:01:13 +00006945 for (unsigned i = 0; i != NumElements; ++i) {
6946 EnumConstantDecl *ECD =
John McCalld226f652010-08-21 09:40:31 +00006947 cast_or_null<EnumConstantDecl>(Elements[i]);
Reid Spencer5f016e22007-07-11 17:01:13 +00006948 if (!ECD) continue; // Already issued a diagnostic.
Mike Stump1eb44332009-09-09 15:08:12 +00006949
Chris Lattner211a30e2007-08-28 05:27:00 +00006950 const llvm::APSInt &InitVal = ECD->getInitVal();
Mike Stump1eb44332009-09-09 15:08:12 +00006951
Chris Lattnerac609682007-08-28 06:15:15 +00006952 // Keep track of the size of positive and negative values.
Chris Lattnera73349d2008-02-26 00:33:57 +00006953 if (InitVal.isUnsigned() || InitVal.isNonNegative())
Chris Lattner21dd8212008-01-14 21:47:29 +00006954 NumPositiveBits = std::max(NumPositiveBits,
6955 (unsigned)InitVal.getActiveBits());
Chris Lattnerac609682007-08-28 06:15:15 +00006956 else
Chris Lattner21dd8212008-01-14 21:47:29 +00006957 NumNegativeBits = std::max(NumNegativeBits,
6958 (unsigned)InitVal.getMinSignedBits());
Reid Spencer5f016e22007-07-11 17:01:13 +00006959
Chris Lattnerac609682007-08-28 06:15:15 +00006960 // Keep track of whether every enum element has type int (very commmon).
6961 if (AllElementsInt)
Mike Stump1eb44332009-09-09 15:08:12 +00006962 AllElementsInt = ECD->getType() == Context.IntTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00006963 }
Mike Stump1eb44332009-09-09 15:08:12 +00006964
Chris Lattnerac609682007-08-28 06:15:15 +00006965 // Figure out the type that should be used for this enum.
Edward O'Callaghanfee13812009-08-08 14:36:57 +00006966 // FIXME: Support -fshort-enums.
Chris Lattnerac609682007-08-28 06:15:15 +00006967 QualType BestType;
Chris Lattnerb7f6e082007-08-29 17:31:48 +00006968 unsigned BestWidth;
Edward O'Callaghanfee13812009-08-08 14:36:57 +00006969
John McCall842aef82009-12-09 09:09:27 +00006970 // C++0x N3000 [conv.prom]p3:
6971 // An rvalue of an unscoped enumeration type whose underlying
6972 // type is not fixed can be converted to an rvalue of the first
6973 // of the following types that can represent all the values of
6974 // the enumeration: int, unsigned int, long int, unsigned long
6975 // int, long long int, or unsigned long long int.
6976 // C99 6.4.4.3p2:
6977 // An identifier declared as an enumeration constant has type int.
6978 // The C99 rule is modified by a gcc extension
6979 QualType BestPromotionType;
6980
Edward O'Callaghanfee13812009-08-08 14:36:57 +00006981 bool Packed = Enum->getAttr<PackedAttr>() ? true : false;
6982
Chris Lattnerac609682007-08-28 06:15:15 +00006983 if (NumNegativeBits) {
Mike Stump1eb44332009-09-09 15:08:12 +00006984 // If there is a negative value, figure out the smallest integer type (of
Chris Lattnerac609682007-08-28 06:15:15 +00006985 // int/long/longlong) that fits.
Edward O'Callaghanfee13812009-08-08 14:36:57 +00006986 // If it's packed, check also if it fits a char or a short.
6987 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) {
John McCall842aef82009-12-09 09:09:27 +00006988 BestType = Context.SignedCharTy;
6989 BestWidth = CharWidth;
Mike Stump1eb44332009-09-09 15:08:12 +00006990 } else if (Packed && NumNegativeBits <= ShortWidth &&
Edward O'Callaghanfee13812009-08-08 14:36:57 +00006991 NumPositiveBits < ShortWidth) {
John McCall842aef82009-12-09 09:09:27 +00006992 BestType = Context.ShortTy;
6993 BestWidth = ShortWidth;
6994 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) {
Chris Lattnerac609682007-08-28 06:15:15 +00006995 BestType = Context.IntTy;
Chris Lattnerb7f6e082007-08-29 17:31:48 +00006996 BestWidth = IntWidth;
6997 } else {
Chris Lattner98be4942008-03-05 18:54:05 +00006998 BestWidth = Context.Target.getLongWidth();
Mike Stump1eb44332009-09-09 15:08:12 +00006999
John McCall842aef82009-12-09 09:09:27 +00007000 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) {
Chris Lattnerac609682007-08-28 06:15:15 +00007001 BestType = Context.LongTy;
John McCall842aef82009-12-09 09:09:27 +00007002 } else {
Chris Lattner98be4942008-03-05 18:54:05 +00007003 BestWidth = Context.Target.getLongLongWidth();
Mike Stump1eb44332009-09-09 15:08:12 +00007004
Chris Lattnerb7f6e082007-08-29 17:31:48 +00007005 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth)
Chris Lattnerac609682007-08-28 06:15:15 +00007006 Diag(Enum->getLocation(), diag::warn_enum_too_large);
7007 BestType = Context.LongLongTy;
7008 }
7009 }
John McCall842aef82009-12-09 09:09:27 +00007010 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType);
Chris Lattnerac609682007-08-28 06:15:15 +00007011 } else {
Douglas Gregoraa74a1e2010-02-02 20:10:50 +00007012 // If there is no negative value, figure out the smallest type that fits
7013 // all of the enumerator values.
Edward O'Callaghanfee13812009-08-08 14:36:57 +00007014 // If it's packed, check also if it fits a char or a short.
7015 if (Packed && NumPositiveBits <= CharWidth) {
John McCall842aef82009-12-09 09:09:27 +00007016 BestType = Context.UnsignedCharTy;
7017 BestPromotionType = Context.IntTy;
7018 BestWidth = CharWidth;
Edward O'Callaghanfee13812009-08-08 14:36:57 +00007019 } else if (Packed && NumPositiveBits <= ShortWidth) {
John McCall842aef82009-12-09 09:09:27 +00007020 BestType = Context.UnsignedShortTy;
7021 BestPromotionType = Context.IntTy;
7022 BestWidth = ShortWidth;
7023 } else if (NumPositiveBits <= IntWidth) {
Chris Lattnerac609682007-08-28 06:15:15 +00007024 BestType = Context.UnsignedIntTy;
Chris Lattnerb7f6e082007-08-29 17:31:48 +00007025 BestWidth = IntWidth;
Douglas Gregoraa74a1e2010-02-02 20:10:50 +00007026 BestPromotionType
7027 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus)
7028 ? Context.UnsignedIntTy : Context.IntTy;
Chris Lattnerb7f6e082007-08-29 17:31:48 +00007029 } else if (NumPositiveBits <=
Chris Lattner98be4942008-03-05 18:54:05 +00007030 (BestWidth = Context.Target.getLongWidth())) {
Chris Lattnerac609682007-08-28 06:15:15 +00007031 BestType = Context.UnsignedLongTy;
Douglas Gregoraa74a1e2010-02-02 20:10:50 +00007032 BestPromotionType
7033 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus)
7034 ? Context.UnsignedLongTy : Context.LongTy;
Chris Lattner98be4942008-03-05 18:54:05 +00007035 } else {
7036 BestWidth = Context.Target.getLongLongWidth();
Chris Lattnerb7f6e082007-08-29 17:31:48 +00007037 assert(NumPositiveBits <= BestWidth &&
Chris Lattnerac609682007-08-28 06:15:15 +00007038 "How could an initializer get larger than ULL?");
7039 BestType = Context.UnsignedLongLongTy;
Douglas Gregoraa74a1e2010-02-02 20:10:50 +00007040 BestPromotionType
7041 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus)
7042 ? Context.UnsignedLongLongTy : Context.LongLongTy;
Chris Lattnerac609682007-08-28 06:15:15 +00007043 }
7044 }
Mike Stump1eb44332009-09-09 15:08:12 +00007045
Chris Lattnerb7f6e082007-08-29 17:31:48 +00007046 // Loop over all of the enumerator constants, changing their types to match
7047 // the type of the enum if needed.
7048 for (unsigned i = 0; i != NumElements; ++i) {
John McCalld226f652010-08-21 09:40:31 +00007049 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]);
Chris Lattnerb7f6e082007-08-29 17:31:48 +00007050 if (!ECD) continue; // Already issued a diagnostic.
7051
7052 // Standard C says the enumerators have int type, but we allow, as an
7053 // extension, the enumerators to be larger than int size. If each
7054 // enumerator value fits in an int, type it as an int, otherwise type it the
7055 // same as the enumerator decl itself. This means that in "enum { X = 1U }"
7056 // that X has type 'int', not 'unsigned'.
Chris Lattnerb7f6e082007-08-29 17:31:48 +00007057
7058 // Determine whether the value fits into an int.
7059 llvm::APSInt InitVal = ECD->getInitVal();
Chris Lattnerb7f6e082007-08-29 17:31:48 +00007060
7061 // If it fits into an integer type, force it. Otherwise force it to match
7062 // the enum decl type.
7063 QualType NewTy;
7064 unsigned NewWidth;
7065 bool NewSign;
Douglas Gregor677e4fe2010-02-01 23:36:03 +00007066 if (!getLangOptions().CPlusPlus &&
7067 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) {
Chris Lattnerb7f6e082007-08-29 17:31:48 +00007068 NewTy = Context.IntTy;
7069 NewWidth = IntWidth;
7070 NewSign = true;
7071 } else if (ECD->getType() == BestType) {
7072 // Already the right type!
Douglas Gregorc9467cf2008-12-12 02:00:36 +00007073 if (getLangOptions().CPlusPlus)
7074 // C++ [dcl.enum]p4: Following the closing brace of an
7075 // enum-specifier, each enumerator has the type of its
Mike Stump1eb44332009-09-09 15:08:12 +00007076 // enumeration.
Douglas Gregorc9467cf2008-12-12 02:00:36 +00007077 ECD->setType(EnumType);
Chris Lattnerb7f6e082007-08-29 17:31:48 +00007078 continue;
7079 } else {
7080 NewTy = BestType;
7081 NewWidth = BestWidth;
7082 NewSign = BestType->isSignedIntegerType();
7083 }
7084
7085 // Adjust the APSInt value.
7086 InitVal.extOrTrunc(NewWidth);
7087 InitVal.setIsSigned(NewSign);
7088 ECD->setInitVal(InitVal);
Mike Stump1eb44332009-09-09 15:08:12 +00007089
Chris Lattnerb7f6e082007-08-29 17:31:48 +00007090 // Adjust the Expr initializer and type.
Chris Lattner13fd4162009-01-15 19:19:42 +00007091 if (ECD->getInitExpr())
John McCallf871d0c2010-08-07 06:22:56 +00007092 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy,
John McCall2de56d12010-08-25 11:45:40 +00007093 CK_IntegralCast,
John McCallf871d0c2010-08-07 06:22:56 +00007094 ECD->getInitExpr(),
7095 /*base paths*/ 0,
John McCall5baba9d2010-08-25 10:28:54 +00007096 VK_RValue));
Douglas Gregorc9467cf2008-12-12 02:00:36 +00007097 if (getLangOptions().CPlusPlus)
7098 // C++ [dcl.enum]p4: Following the closing brace of an
7099 // enum-specifier, each enumerator has the type of its
Mike Stump1eb44332009-09-09 15:08:12 +00007100 // enumeration.
Douglas Gregorc9467cf2008-12-12 02:00:36 +00007101 ECD->setType(EnumType);
7102 else
7103 ECD->setType(NewTy);
Chris Lattnerb7f6e082007-08-29 17:31:48 +00007104 }
Mike Stump1eb44332009-09-09 15:08:12 +00007105
John McCall1b5a6182010-05-06 08:49:23 +00007106 Enum->completeDefinition(BestType, BestPromotionType,
7107 NumPositiveBits, NumNegativeBits);
Reid Spencer5f016e22007-07-11 17:01:13 +00007108}
7109
John McCall9ae2f072010-08-23 23:25:46 +00007110Decl *Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, Expr *expr) {
7111 StringLiteral *AsmString = cast<StringLiteral>(expr);
Sebastian Redl798d1192008-12-13 16:23:55 +00007112
Douglas Gregor4fe0c8e2009-05-30 00:08:05 +00007113 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext,
7114 Loc, AsmString);
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00007115 CurContext->addDecl(New);
John McCalld226f652010-08-21 09:40:31 +00007116 return New;
Anders Carlssondfab6cb2008-02-08 00:33:21 +00007117}
Eli Friedmanc49f19b2009-06-05 02:44:36 +00007118
7119void Sema::ActOnPragmaWeakID(IdentifierInfo* Name,
7120 SourceLocation PragmaLoc,
7121 SourceLocation NameLoc) {
Douglas Gregorc83c6872010-04-15 22:33:43 +00007122 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName);
Eli Friedmanc49f19b2009-06-05 02:44:36 +00007123
Eli Friedmanc49f19b2009-06-05 02:44:36 +00007124 if (PrevDecl) {
Sean Huntcf807c42010-08-18 23:23:40 +00007125 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context));
Ryan Flynne25ff832009-07-30 03:15:39 +00007126 } else {
7127 (void)WeakUndeclaredIdentifiers.insert(
7128 std::pair<IdentifierInfo*,WeakInfo>
7129 (Name, WeakInfo((IdentifierInfo*)0, NameLoc)));
Eli Friedmanc49f19b2009-06-05 02:44:36 +00007130 }
Eli Friedmanc49f19b2009-06-05 02:44:36 +00007131}
7132
7133void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name,
7134 IdentifierInfo* AliasName,
7135 SourceLocation PragmaLoc,
7136 SourceLocation NameLoc,
7137 SourceLocation AliasNameLoc) {
Douglas Gregorc83c6872010-04-15 22:33:43 +00007138 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc,
7139 LookupOrdinaryName);
Ryan Flynne25ff832009-07-30 03:15:39 +00007140 WeakInfo W = WeakInfo(Name, NameLoc);
Eli Friedmanc49f19b2009-06-05 02:44:36 +00007141
Eli Friedmanc49f19b2009-06-05 02:44:36 +00007142 if (PrevDecl) {
Ryan Flynne25ff832009-07-30 03:15:39 +00007143 if (!PrevDecl->hasAttr<AliasAttr>())
7144 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl))
Ryan Flynn7b1fdbd2009-07-31 02:52:19 +00007145 DeclApplyPragmaWeak(TUScope, ND, W);
Ryan Flynne25ff832009-07-30 03:15:39 +00007146 } else {
7147 (void)WeakUndeclaredIdentifiers.insert(
7148 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W));
Eli Friedmanc49f19b2009-06-05 02:44:36 +00007149 }
Eli Friedmanc49f19b2009-06-05 02:44:36 +00007150}