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Reid Spencer5f016e22007-07-11 17:01:13 +00001//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===//
2//
3// The LLVM Compiler Infrastructure
4//
Chris Lattner0bc735f2007-12-29 19:59:25 +00005// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
Reid Spencer5f016e22007-07-11 17:01:13 +00007//
8//===----------------------------------------------------------------------===//
9//
10// This file implements semantic analysis for declarations.
11//
12//===----------------------------------------------------------------------===//
13
John McCall2d887082010-08-25 22:03:47 +000014#include "clang/Sema/SemaInternal.h"
Douglas Gregor9e876872011-03-01 18:12:44 +000015#include "TypeLocBuilder.h"
Chris Lattnere1e79852008-02-06 00:51:33 +000016#include "clang/AST/ASTConsumer.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000017#include "clang/AST/ASTContext.h"
Douglas Gregora8f32e02009-10-06 17:59:45 +000018#include "clang/AST/CXXInheritance.h"
Chandler Carruth55fc8732012-12-04 09:13:33 +000019#include "clang/AST/CharUnits.h"
Dmitri Gribenkoa5ef44f2012-07-11 21:38:39 +000020#include "clang/AST/CommentDiagnostic.h"
John McCall384aff82010-08-25 07:42:41 +000021#include "clang/AST/DeclCXX.h"
John McCall7cd088e2010-08-24 07:21:54 +000022#include "clang/AST/DeclObjC.h"
Douglas Gregoraaba5e32009-02-04 19:02:06 +000023#include "clang/AST/DeclTemplate.h"
Chandler Carrutha7689ef2011-03-27 09:46:56 +000024#include "clang/AST/EvaluatedExprVisitor.h"
Chris Lattner6b6b5372008-06-26 18:38:35 +000025#include "clang/AST/ExprCXX.h"
Sebastian Redld3a413d2009-04-26 20:35:05 +000026#include "clang/AST/StmtCXX.h"
Anders Carlssonb7906612009-08-26 23:45:07 +000027#include "clang/Basic/PartialDiagnostic.h"
Steve Naroff4c49a6c2008-01-30 23:46:05 +000028#include "clang/Basic/SourceManager.h"
Anders Carlssonb7906612009-08-26 23:45:07 +000029#include "clang/Basic/TargetInfo.h"
Chandler Carruth55fc8732012-12-04 09:13:33 +000030#include "clang/Lex/HeaderSearch.h" // FIXME: Sema shouldn't depend on Lex
31#include "clang/Lex/ModuleLoader.h" // FIXME: Sema shouldn't depend on Lex
32#include "clang/Lex/Preprocessor.h" // FIXME: Sema shouldn't depend on Lex
33#include "clang/Parse/ParseDiagnostic.h"
34#include "clang/Sema/CXXFieldCollector.h"
35#include "clang/Sema/DeclSpec.h"
36#include "clang/Sema/DelayedDiagnostic.h"
37#include "clang/Sema/Initialization.h"
38#include "clang/Sema/Lookup.h"
39#include "clang/Sema/ParsedTemplate.h"
40#include "clang/Sema/Scope.h"
41#include "clang/Sema/ScopeInfo.h"
Benjamin Kramer8fe83e12012-02-04 13:45:25 +000042#include "llvm/ADT/SmallString.h"
John McCall66755862009-12-24 09:58:38 +000043#include "llvm/ADT/Triple.h"
Douglas Gregor6ed40e32008-12-23 21:05:05 +000044#include <algorithm>
Douglas Gregor9a8c9a22009-09-28 21:14:19 +000045#include <cstring>
Douglas Gregor6ed40e32008-12-23 21:05:05 +000046#include <functional>
Reid Spencer5f016e22007-07-11 17:01:13 +000047using namespace clang;
John McCall781472f2010-08-25 08:40:02 +000048using namespace sema;
Reid Spencer5f016e22007-07-11 17:01:13 +000049
Richard Smithc89edf52011-07-01 19:46:12 +000050Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) {
51 if (OwnedType) {
52 Decl *Group[2] = { OwnedType, Ptr };
53 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2));
54 }
55
John McCalld226f652010-08-21 09:40:31 +000056 return DeclGroupPtrTy::make(DeclGroupRef(Ptr));
Chris Lattner682bf922009-03-29 16:50:03 +000057}
58
Kaelyn Uhrain43e875d2012-01-18 21:41:41 +000059namespace {
60
61class TypeNameValidatorCCC : public CorrectionCandidateCallback {
62 public:
Kaelyn Uhrainc1fb5422012-06-22 23:37:05 +000063 TypeNameValidatorCCC(bool AllowInvalid, bool WantClass=false)
64 : AllowInvalidDecl(AllowInvalid), WantClassName(WantClass) {
Kaelyn Uhrain43e875d2012-01-18 21:41:41 +000065 WantExpressionKeywords = false;
66 WantCXXNamedCasts = false;
67 WantRemainingKeywords = false;
68 }
69
70 virtual bool ValidateCandidate(const TypoCorrection &candidate) {
71 if (NamedDecl *ND = candidate.getCorrectionDecl())
72 return (isa<TypeDecl>(ND) || isa<ObjCInterfaceDecl>(ND)) &&
73 (AllowInvalidDecl || !ND->isInvalidDecl());
74 else
Kaelyn Uhrainc1fb5422012-06-22 23:37:05 +000075 return !WantClassName && candidate.isKeyword();
Kaelyn Uhrain43e875d2012-01-18 21:41:41 +000076 }
77
78 private:
79 bool AllowInvalidDecl;
Kaelyn Uhrainc1fb5422012-06-22 23:37:05 +000080 bool WantClassName;
Kaelyn Uhrain43e875d2012-01-18 21:41:41 +000081};
82
83}
84
Kaelyn Uhrain7bf33402012-06-15 23:45:51 +000085/// \brief Determine whether the token kind starts a simple-type-specifier.
86bool Sema::isSimpleTypeSpecifier(tok::TokenKind Kind) const {
87 switch (Kind) {
88 // FIXME: Take into account the current language when deciding whether a
89 // token kind is a valid type specifier
90 case tok::kw_short:
91 case tok::kw_long:
92 case tok::kw___int64:
93 case tok::kw___int128:
94 case tok::kw_signed:
95 case tok::kw_unsigned:
96 case tok::kw_void:
97 case tok::kw_char:
98 case tok::kw_int:
99 case tok::kw_half:
100 case tok::kw_float:
101 case tok::kw_double:
102 case tok::kw_wchar_t:
103 case tok::kw_bool:
104 case tok::kw___underlying_type:
105 return true;
106
107 case tok::annot_typename:
108 case tok::kw_char16_t:
109 case tok::kw_char32_t:
110 case tok::kw_typeof:
111 case tok::kw_decltype:
112 return getLangOpts().CPlusPlus;
113
114 default:
115 break;
116 }
117
118 return false;
119}
120
Douglas Gregord6efafa2009-02-04 19:16:12 +0000121/// \brief If the identifier refers to a type name within this scope,
122/// return the declaration of that type.
123///
124/// This routine performs ordinary name lookup of the identifier II
125/// within the given scope, with optional C++ scope specifier SS, to
Douglas Gregor1a51b4a2009-02-09 15:09:02 +0000126/// determine whether the name refers to a type. If so, returns an
127/// opaque pointer (actually a QualType) corresponding to that
128/// type. Otherwise, returns NULL.
Douglas Gregord6efafa2009-02-04 19:16:12 +0000129///
130/// If name lookup results in an ambiguity, this routine will complain
131/// and then return NULL.
John McCallb3d87482010-08-24 05:47:05 +0000132ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc,
133 Scope *S, CXXScopeSpec *SS,
Fariborz Jahanian1e52dfc2011-02-08 18:05:59 +0000134 bool isClassName, bool HasTrailingDot,
Douglas Gregor9e876872011-03-01 18:12:44 +0000135 ParsedType ObjectTypePtr,
Abramo Bagnarafad03b72012-01-27 08:46:19 +0000136 bool IsCtorOrDtorName,
Kaelyn Uhrainfac94672011-10-11 01:02:41 +0000137 bool WantNontrivialTypeSourceInfo,
138 IdentifierInfo **CorrectedII) {
Douglas Gregorf6e6fc82009-11-20 22:03:38 +0000139 // Determine where we will perform name lookup.
140 DeclContext *LookupCtx = 0;
141 if (ObjectTypePtr) {
John McCallb3d87482010-08-24 05:47:05 +0000142 QualType ObjectType = ObjectTypePtr.get();
Douglas Gregorf6e6fc82009-11-20 22:03:38 +0000143 if (ObjectType->isRecordType())
144 LookupCtx = computeDeclContext(ObjectType);
Jeffrey Yasskinedc28772010-04-07 23:29:58 +0000145 } else if (SS && SS->isNotEmpty()) {
Douglas Gregorf6e6fc82009-11-20 22:03:38 +0000146 LookupCtx = computeDeclContext(*SS, false);
147
148 if (!LookupCtx) {
149 if (isDependentScopeSpecifier(*SS)) {
150 // C++ [temp.res]p3:
151 // A qualified-id that refers to a type and in which the
152 // nested-name-specifier depends on a template-parameter (14.6.2)
153 // shall be prefixed by the keyword typename to indicate that the
154 // qualified-id denotes a type, forming an
155 // elaborated-type-specifier (7.1.5.3).
156 //
157 // We therefore do not perform any name lookup if the result would
158 // refer to a member of an unknown specialization.
Richard Smithc5a89a12012-04-02 01:30:27 +0000159 if (!isClassName && !IsCtorOrDtorName)
John McCallb3d87482010-08-24 05:47:05 +0000160 return ParsedType();
Douglas Gregorf6e6fc82009-11-20 22:03:38 +0000161
John McCall33500952010-06-11 00:33:02 +0000162 // We know from the grammar that this name refers to a type,
163 // so build a dependent node to describe the type.
Douglas Gregor9e876872011-03-01 18:12:44 +0000164 if (WantNontrivialTypeSourceInfo)
165 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get();
166
167 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context);
John McCallb3d87482010-08-24 05:47:05 +0000168 QualType T =
Douglas Gregor9e876872011-03-01 18:12:44 +0000169 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc,
Douglas Gregore29425b2011-02-28 22:42:13 +0000170 II, NameLoc);
Douglas Gregor9e876872011-03-01 18:12:44 +0000171
172 return ParsedType::make(T);
Douglas Gregorf6e6fc82009-11-20 22:03:38 +0000173 }
174
John McCallb3d87482010-08-24 05:47:05 +0000175 return ParsedType();
Douglas Gregorf6e6fc82009-11-20 22:03:38 +0000176 }
177
John McCall77bb1aa2010-05-01 00:40:08 +0000178 if (!LookupCtx->isDependentContext() &&
179 RequireCompleteDeclContext(*SS, LookupCtx))
John McCallb3d87482010-08-24 05:47:05 +0000180 return ParsedType();
Douglas Gregor42c39f32009-08-26 18:27:52 +0000181 }
Eli Friedman0f0615b2009-12-21 01:42:38 +0000182
183 // FIXME: LookupNestedNameSpecifierName isn't the right kind of
184 // lookup for class-names.
185 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName :
186 LookupOrdinaryName;
187 LookupResult Result(*this, &II, NameLoc, Kind);
Douglas Gregorf6e6fc82009-11-20 22:03:38 +0000188 if (LookupCtx) {
189 // Perform "qualified" name lookup into the declaration context we
190 // computed, which is either the type of the base of a member access
191 // expression or the declaration context associated with a prior
192 // nested-name-specifier.
193 LookupQualifiedName(Result, LookupCtx);
Douglas Gregor42af25f2009-05-11 19:58:34 +0000194
Douglas Gregorf6e6fc82009-11-20 22:03:38 +0000195 if (ObjectTypePtr && Result.empty()) {
196 // C++ [basic.lookup.classref]p3:
197 // If the unqualified-id is ~type-name, the type-name is looked up
198 // in the context of the entire postfix-expression. If the type T of
199 // the object expression is of a class type C, the type-name is also
200 // looked up in the scope of class C. At least one of the lookups shall
201 // find a name that refers to (possibly cv-qualified) T.
202 LookupName(Result, S);
203 }
204 } else {
205 // Perform unqualified name lookup.
206 LookupName(Result, S);
207 }
208
Chris Lattner22bd9052009-02-16 22:07:16 +0000209 NamedDecl *IIDecl = 0;
John McCalla24dc2e2009-11-17 02:14:36 +0000210 switch (Result.getResultKind()) {
Chris Lattner22bd9052009-02-16 22:07:16 +0000211 case LookupResult::NotFound:
Douglas Gregor7d3f5762010-01-15 01:44:47 +0000212 case LookupResult::NotFoundInCurrentInstantiation:
Kaelyn Uhrainfac94672011-10-11 01:02:41 +0000213 if (CorrectedII) {
Kaelyn Uhrainc1fb5422012-06-22 23:37:05 +0000214 TypeNameValidatorCCC Validator(true, isClassName);
Kaelyn Uhrainfac94672011-10-11 01:02:41 +0000215 TypoCorrection Correction = CorrectTypo(Result.getLookupNameInfo(),
Kaelyn Uhrain16e46dd2012-01-31 23:49:25 +0000216 Kind, S, SS, Validator);
Kaelyn Uhrainfac94672011-10-11 01:02:41 +0000217 IdentifierInfo *NewII = Correction.getCorrectionAsIdentifierInfo();
218 TemplateTy Template;
219 bool MemberOfUnknownSpecialization;
220 UnqualifiedId TemplateName;
221 TemplateName.setIdentifier(NewII, NameLoc);
222 NestedNameSpecifier *NNS = Correction.getCorrectionSpecifier();
223 CXXScopeSpec NewSS, *NewSSPtr = SS;
224 if (SS && NNS) {
225 NewSS.MakeTrivial(Context, NNS, SourceRange(NameLoc));
226 NewSSPtr = &NewSS;
227 }
228 if (Correction && (NNS || NewII != &II) &&
229 // Ignore a correction to a template type as the to-be-corrected
230 // identifier is not a template (typo correction for template names
231 // is handled elsewhere).
David Blaikie4e4d0842012-03-11 07:00:24 +0000232 !(getLangOpts().CPlusPlus && NewSSPtr &&
Kaelyn Uhrainfac94672011-10-11 01:02:41 +0000233 isTemplateName(S, *NewSSPtr, false, TemplateName, ParsedType(),
234 false, Template, MemberOfUnknownSpecialization))) {
235 ParsedType Ty = getTypeName(*NewII, NameLoc, S, NewSSPtr,
236 isClassName, HasTrailingDot, ObjectTypePtr,
Abramo Bagnarafad03b72012-01-27 08:46:19 +0000237 IsCtorOrDtorName,
Kaelyn Uhrainfac94672011-10-11 01:02:41 +0000238 WantNontrivialTypeSourceInfo);
239 if (Ty) {
David Blaikie4e4d0842012-03-11 07:00:24 +0000240 std::string CorrectedStr(Correction.getAsString(getLangOpts()));
Kaelyn Uhrainfac94672011-10-11 01:02:41 +0000241 std::string CorrectedQuotedStr(
David Blaikie4e4d0842012-03-11 07:00:24 +0000242 Correction.getQuoted(getLangOpts()));
Kaelyn Uhrainc1fb5422012-06-22 23:37:05 +0000243 Diag(NameLoc, diag::err_unknown_type_or_class_name_suggest)
244 << Result.getLookupName() << CorrectedQuotedStr << isClassName
Kaelyn Uhrainfac94672011-10-11 01:02:41 +0000245 << FixItHint::CreateReplacement(SourceRange(NameLoc),
246 CorrectedStr);
247 if (NamedDecl *FirstDecl = Correction.getCorrectionDecl())
248 Diag(FirstDecl->getLocation(), diag::note_previous_decl)
249 << CorrectedQuotedStr;
250
251 if (SS && NNS)
252 SS->MakeTrivial(Context, NNS, SourceRange(NameLoc));
253 *CorrectedII = NewII;
254 return Ty;
255 }
256 }
257 }
258 // If typo correction failed or was not performed, fall through
Chris Lattner22bd9052009-02-16 22:07:16 +0000259 case LookupResult::FoundOverloaded:
John McCall7ba107a2009-11-18 02:36:19 +0000260 case LookupResult::FoundUnresolvedValue:
John McCallc373d482010-01-27 01:50:18 +0000261 Result.suppressDiagnostics();
John McCallb3d87482010-08-24 05:47:05 +0000262 return ParsedType();
Douglas Gregorb696ea32009-02-04 17:00:24 +0000263
Chris Lattnera64ef0a2009-10-25 22:09:09 +0000264 case LookupResult::Ambiguous:
John McCall6e247262009-10-10 05:48:19 +0000265 // Recover from type-hiding ambiguities by hiding the type. We'll
266 // do the lookup again when looking for an object, and we can
267 // diagnose the error then. If we don't do this, then the error
268 // about hiding the type will be immediately followed by an error
269 // that only makes sense if the identifier was treated like a type.
John McCalla24dc2e2009-11-17 02:14:36 +0000270 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) {
271 Result.suppressDiagnostics();
John McCallb3d87482010-08-24 05:47:05 +0000272 return ParsedType();
John McCalla24dc2e2009-11-17 02:14:36 +0000273 }
John McCall6e247262009-10-10 05:48:19 +0000274
Douglas Gregor31a19b62009-04-01 21:51:26 +0000275 // Look to see if we have a type anywhere in the list of results.
276 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end();
277 Res != ResEnd; ++Res) {
278 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) {
Mike Stump1eb44332009-09-09 15:08:12 +0000279 if (!IIDecl ||
280 (*Res)->getLocation().getRawEncoding() <
Douglas Gregor841b53c2009-04-13 15:14:38 +0000281 IIDecl->getLocation().getRawEncoding())
282 IIDecl = *Res;
Douglas Gregor31a19b62009-04-01 21:51:26 +0000283 }
284 }
285
286 if (!IIDecl) {
287 // None of the entities we found is a type, so there is no way
288 // to even assume that the result is a type. In this case, don't
289 // complain about the ambiguity. The parser will either try to
290 // perform this lookup again (e.g., as an object name), which
291 // will produce the ambiguity, or will complain that it expected
292 // a type name.
John McCalla24dc2e2009-11-17 02:14:36 +0000293 Result.suppressDiagnostics();
John McCallb3d87482010-08-24 05:47:05 +0000294 return ParsedType();
Douglas Gregor31a19b62009-04-01 21:51:26 +0000295 }
296
297 // We found a type within the ambiguous lookup; diagnose the
298 // ambiguity and then return that type. This might be the right
299 // answer, or it might not be, but it suppresses any attempt to
300 // perform the name lookup again.
Douglas Gregor31a19b62009-04-01 21:51:26 +0000301 break;
Douglas Gregorb696ea32009-02-04 17:00:24 +0000302
Chris Lattner22bd9052009-02-16 22:07:16 +0000303 case LookupResult::Found:
John McCallf36e02d2009-10-09 21:13:30 +0000304 IIDecl = Result.getFoundDecl();
Chris Lattner22bd9052009-02-16 22:07:16 +0000305 break;
Douglas Gregor7176fff2009-01-15 00:26:24 +0000306 }
307
Chris Lattner10ca3372009-10-25 17:16:46 +0000308 assert(IIDecl && "Didn't find decl");
John McCall54abf7d2009-11-04 02:18:39 +0000309
Chris Lattner10ca3372009-10-25 17:16:46 +0000310 QualType T;
311 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) {
John McCall54abf7d2009-11-04 02:18:39 +0000312 DiagnoseUseOfDecl(IIDecl, NameLoc);
John McCalla24dc2e2009-11-17 02:14:36 +0000313
Chris Lattner10ca3372009-10-25 17:16:46 +0000314 if (T.isNull())
315 T = Context.getTypeDeclType(TD);
Abramo Bagnarafad03b72012-01-27 08:46:19 +0000316
317 // NOTE: avoid constructing an ElaboratedType(Loc) if this is a
318 // constructor or destructor name (in such a case, the scope specifier
319 // will be attached to the enclosing Expr or Decl node).
320 if (SS && SS->isNotEmpty() && !IsCtorOrDtorName) {
Douglas Gregor9e876872011-03-01 18:12:44 +0000321 if (WantNontrivialTypeSourceInfo) {
322 // Construct a type with type-source information.
323 TypeLocBuilder Builder;
324 Builder.pushTypeSpec(T).setNameLoc(NameLoc);
325
326 T = getElaboratedType(ETK_None, *SS, T);
327 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T);
Abramo Bagnara38a42912012-02-06 19:09:27 +0000328 ElabTL.setElaboratedKeywordLoc(SourceLocation());
Douglas Gregor9e876872011-03-01 18:12:44 +0000329 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context));
330 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T));
331 } else {
332 T = getElaboratedType(ETK_None, *SS, T);
333 }
334 }
Chris Lattner10ca3372009-10-25 17:16:46 +0000335 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) {
Fariborz Jahanian02b0d652011-03-08 19:12:46 +0000336 (void)DiagnoseUseOfDecl(IDecl, NameLoc);
Fariborz Jahanian1e52dfc2011-02-08 18:05:59 +0000337 if (!HasTrailingDot)
338 T = Context.getObjCInterfaceType(IDecl);
339 }
340
341 if (T.isNull()) {
John McCalla24dc2e2009-11-17 02:14:36 +0000342 // If it's not plausibly a type, suppress diagnostics.
343 Result.suppressDiagnostics();
John McCallb3d87482010-08-24 05:47:05 +0000344 return ParsedType();
John McCalla24dc2e2009-11-17 02:14:36 +0000345 }
John McCallb3d87482010-08-24 05:47:05 +0000346 return ParsedType::make(T);
Reid Spencer5f016e22007-07-11 17:01:13 +0000347}
348
Chris Lattner4c97d762009-04-12 21:49:30 +0000349/// isTagName() - This method is called *for error recovery purposes only*
350/// to determine if the specified name is a valid tag name ("struct foo"). If
351/// so, this returns the TST for the tag corresponding to it (TST_enum,
Joao Matos6666ed42012-08-31 18:45:21 +0000352/// TST_union, TST_struct, TST_interface, TST_class). This is used to diagnose
353/// cases in C where the user forgot to specify the tag.
Chris Lattner4c97d762009-04-12 21:49:30 +0000354DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) {
355 // Do a tag name lookup in this scope.
John McCalla24dc2e2009-11-17 02:14:36 +0000356 LookupResult R(*this, &II, SourceLocation(), LookupTagName);
357 LookupName(R, S, false);
358 R.suppressDiagnostics();
359 if (R.getResultKind() == LookupResult::Found)
John McCall1bcee0a2009-12-02 08:25:40 +0000360 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) {
Chris Lattner4c97d762009-04-12 21:49:30 +0000361 switch (TD->getTagKind()) {
Abramo Bagnara465d41b2010-05-11 21:36:43 +0000362 case TTK_Struct: return DeclSpec::TST_struct;
Joao Matos6666ed42012-08-31 18:45:21 +0000363 case TTK_Interface: return DeclSpec::TST_interface;
Abramo Bagnara465d41b2010-05-11 21:36:43 +0000364 case TTK_Union: return DeclSpec::TST_union;
365 case TTK_Class: return DeclSpec::TST_class;
366 case TTK_Enum: return DeclSpec::TST_enum;
Chris Lattner4c97d762009-04-12 21:49:30 +0000367 }
368 }
Mike Stump1eb44332009-09-09 15:08:12 +0000369
Chris Lattner4c97d762009-04-12 21:49:30 +0000370 return DeclSpec::TST_unspecified;
371}
372
Francois Pichet6943e9b2011-04-13 02:38:49 +0000373/// isMicrosoftMissingTypename - In Microsoft mode, within class scope,
374/// if a CXXScopeSpec's type is equal to the type of one of the base classes
375/// then downgrade the missing typename error to a warning.
376/// This is needed for MSVC compatibility; Example:
377/// @code
378/// template<class T> class A {
379/// public:
380/// typedef int TYPE;
381/// };
382/// template<class T> class B : public A<T> {
383/// public:
384/// A<T>::TYPE a; // no typename required because A<T> is a base class.
385/// };
386/// @endcode
Francois Pichetf11dbe92011-10-11 01:50:09 +0000387bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S) {
Francois Pichet6943e9b2011-04-13 02:38:49 +0000388 if (CurContext->isRecord()) {
Francois Pichet3441a522011-04-13 02:44:57 +0000389 const Type *Ty = SS->getScopeRep()->getAsType();
Francois Pichet6943e9b2011-04-13 02:38:49 +0000390
391 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext);
392 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(),
393 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base)
394 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType()))
395 return true;
Francois Pichetf11dbe92011-10-11 01:50:09 +0000396 return S->isFunctionPrototypeScope();
Francois Pichet6943e9b2011-04-13 02:38:49 +0000397 }
Francois Pichetf11dbe92011-10-11 01:50:09 +0000398 return CurContext->isFunctionOrMethod() || S->isFunctionPrototypeScope();
Francois Pichet6943e9b2011-04-13 02:38:49 +0000399}
400
Kaelyn Uhrain50dc12a2012-06-15 23:45:58 +0000401bool Sema::DiagnoseUnknownTypeName(IdentifierInfo *&II,
Douglas Gregora786fdb2009-10-13 23:27:22 +0000402 SourceLocation IILoc,
403 Scope *S,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +0000404 CXXScopeSpec *SS,
John McCallb3d87482010-08-24 05:47:05 +0000405 ParsedType &SuggestedType) {
Douglas Gregora786fdb2009-10-13 23:27:22 +0000406 // We don't have anything to suggest (yet).
John McCallb3d87482010-08-24 05:47:05 +0000407 SuggestedType = ParsedType();
Douglas Gregora786fdb2009-10-13 23:27:22 +0000408
Douglas Gregor546be3c2009-12-30 17:04:44 +0000409 // There may have been a typo in the name of the type. Look up typo
410 // results, in case we have something that we can suggest.
Kaelyn Uhrain43e875d2012-01-18 21:41:41 +0000411 TypeNameValidatorCCC Validator(false);
Kaelyn Uhrain50dc12a2012-06-15 23:45:58 +0000412 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(II, IILoc),
Kaelyn Uhrain43e875d2012-01-18 21:41:41 +0000413 LookupOrdinaryName, S, SS,
Kaelyn Uhrain16e46dd2012-01-31 23:49:25 +0000414 Validator)) {
David Blaikie4e4d0842012-03-11 07:00:24 +0000415 std::string CorrectedStr(Corrected.getAsString(getLangOpts()));
416 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOpts()));
Douglas Gregor546be3c2009-12-30 17:04:44 +0000417
Douglas Gregord8bba9c2011-06-28 16:20:02 +0000418 if (Corrected.isKeyword()) {
419 // We corrected to a keyword.
Kaelyn Uhrain50dc12a2012-06-15 23:45:58 +0000420 IdentifierInfo *NewII = Corrected.getCorrectionAsIdentifierInfo();
421 if (!isSimpleTypeSpecifier(NewII->getTokenID()))
422 CorrectedQuotedStr = "the keyword " + CorrectedQuotedStr;
Douglas Gregord8bba9c2011-06-28 16:20:02 +0000423 Diag(IILoc, diag::err_unknown_typename_suggest)
Kaelyn Uhrain50dc12a2012-06-15 23:45:58 +0000424 << II << CorrectedQuotedStr
425 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr);
426 II = NewII;
Douglas Gregord8bba9c2011-06-28 16:20:02 +0000427 } else {
428 NamedDecl *Result = Corrected.getCorrectionDecl();
Kaelyn Uhrain43e875d2012-01-18 21:41:41 +0000429 // We found a similarly-named type or interface; suggest that.
430 if (!SS || !SS->isSet())
431 Diag(IILoc, diag::err_unknown_typename_suggest)
Kaelyn Uhrain50dc12a2012-06-15 23:45:58 +0000432 << II << CorrectedQuotedStr
Kaelyn Uhrain43e875d2012-01-18 21:41:41 +0000433 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr);
434 else if (DeclContext *DC = computeDeclContext(*SS, false))
435 Diag(IILoc, diag::err_unknown_nested_typename_suggest)
Kaelyn Uhrain50dc12a2012-06-15 23:45:58 +0000436 << II << DC << CorrectedQuotedStr << SS->getRange()
David Blaikie6952c012012-10-12 20:00:44 +0000437 << FixItHint::CreateReplacement(Corrected.getCorrectionRange(),
438 CorrectedStr);
Kaelyn Uhrain43e875d2012-01-18 21:41:41 +0000439 else
440 llvm_unreachable("could not have corrected a typo here");
Douglas Gregor546be3c2009-12-30 17:04:44 +0000441
Kaelyn Uhrain43e875d2012-01-18 21:41:41 +0000442 Diag(Result->getLocation(), diag::note_previous_decl)
443 << CorrectedQuotedStr;
444
445 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS,
446 false, false, ParsedType(),
Abramo Bagnarafad03b72012-01-27 08:46:19 +0000447 /*IsCtorOrDtorName=*/false,
Kaelyn Uhrain43e875d2012-01-18 21:41:41 +0000448 /*NonTrivialTypeSourceInfo=*/true);
Douglas Gregor546be3c2009-12-30 17:04:44 +0000449 }
Kaelyn Uhrain43e875d2012-01-18 21:41:41 +0000450 return true;
Douglas Gregor546be3c2009-12-30 17:04:44 +0000451 }
452
David Blaikie4e4d0842012-03-11 07:00:24 +0000453 if (getLangOpts().CPlusPlus) {
Jeffrey Yasskinc173be22010-04-08 21:04:54 +0000454 // See if II is a class template that the user forgot to pass arguments to.
455 UnqualifiedId Name;
Kaelyn Uhrain50dc12a2012-06-15 23:45:58 +0000456 Name.setIdentifier(II, IILoc);
Jeffrey Yasskinc173be22010-04-08 21:04:54 +0000457 CXXScopeSpec EmptySS;
458 TemplateTy TemplateResult;
Douglas Gregor1fd6d442010-05-21 23:18:07 +0000459 bool MemberOfUnknownSpecialization;
Abramo Bagnara7c153532010-08-06 12:11:11 +0000460 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false,
John McCallb3d87482010-08-24 05:47:05 +0000461 Name, ParsedType(), true, TemplateResult,
Douglas Gregor1fd6d442010-05-21 23:18:07 +0000462 MemberOfUnknownSpecialization) == TNK_Type_template) {
Jeffrey Yasskinc173be22010-04-08 21:04:54 +0000463 TemplateName TplName = TemplateResult.getAsVal<TemplateName>();
464 Diag(IILoc, diag::err_template_missing_args) << TplName;
465 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) {
466 Diag(TplDecl->getLocation(), diag::note_template_decl_here)
467 << TplDecl->getTemplateParameters()->getSourceRange();
468 }
469 return true;
470 }
471 }
472
Douglas Gregora786fdb2009-10-13 23:27:22 +0000473 // FIXME: Should we move the logic that tries to recover from a missing tag
474 // (struct, union, enum) from Parser::ParseImplicitInt here, instead?
475
Douglas Gregor546be3c2009-12-30 17:04:44 +0000476 if (!SS || (!SS->isSet() && !SS->isInvalid()))
Kaelyn Uhrain50dc12a2012-06-15 23:45:58 +0000477 Diag(IILoc, diag::err_unknown_typename) << II;
Douglas Gregora786fdb2009-10-13 23:27:22 +0000478 else if (DeclContext *DC = computeDeclContext(*SS, false))
479 Diag(IILoc, diag::err_typename_nested_not_found)
Kaelyn Uhrain50dc12a2012-06-15 23:45:58 +0000480 << II << DC << SS->getRange();
Douglas Gregora786fdb2009-10-13 23:27:22 +0000481 else if (isDependentScopeSpecifier(*SS)) {
Francois Pichet6943e9b2011-04-13 02:38:49 +0000482 unsigned DiagID = diag::err_typename_missing;
David Blaikie4e4d0842012-03-11 07:00:24 +0000483 if (getLangOpts().MicrosoftMode && isMicrosoftMissingTypename(SS, S))
Francois Pichetcf320c62011-04-22 08:25:24 +0000484 DiagID = diag::warn_typename_missing;
Francois Pichet6943e9b2011-04-13 02:38:49 +0000485
486 Diag(SS->getRange().getBegin(), DiagID)
Kaelyn Uhrain50dc12a2012-06-15 23:45:58 +0000487 << (NestedNameSpecifier *)SS->getScopeRep() << II->getName()
Douglas Gregora786fdb2009-10-13 23:27:22 +0000488 << SourceRange(SS->getRange().getBegin(), IILoc)
Douglas Gregor849b2432010-03-31 17:46:05 +0000489 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename ");
Kaelyn Uhrain50dc12a2012-06-15 23:45:58 +0000490 SuggestedType = ActOnTypenameType(S, SourceLocation(),
491 *SS, *II, IILoc).get();
Douglas Gregora786fdb2009-10-13 23:27:22 +0000492 } else {
493 assert(SS && SS->isInvalid() &&
494 "Invalid scope specifier has already been diagnosed");
495 }
496
497 return true;
498}
Chris Lattner4c97d762009-04-12 21:49:30 +0000499
Douglas Gregor312eadb2011-04-24 05:37:28 +0000500/// \brief Determine whether the given result set contains either a type name
501/// or
502static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) {
David Blaikie4e4d0842012-03-11 07:00:24 +0000503 bool CheckTemplate = R.getSema().getLangOpts().CPlusPlus &&
Douglas Gregor312eadb2011-04-24 05:37:28 +0000504 NextToken.is(tok::less);
505
506 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) {
507 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I))
508 return true;
509
510 if (CheckTemplate && isa<TemplateDecl>(*I))
511 return true;
512 }
513
514 return false;
515}
516
Kaelyn Uhrain12f32972012-05-02 00:11:40 +0000517static bool isTagTypeWithMissingTag(Sema &SemaRef, LookupResult &Result,
518 Scope *S, CXXScopeSpec &SS,
519 IdentifierInfo *&Name,
520 SourceLocation NameLoc) {
Richard Smith69e48262012-09-06 01:37:56 +0000521 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupTagName);
522 SemaRef.LookupParsedName(R, S, &SS);
523 if (TagDecl *Tag = R.getAsSingle<TagDecl>()) {
Kaelyn Uhrain12f32972012-05-02 00:11:40 +0000524 const char *TagName = 0;
525 const char *FixItTagName = 0;
526 switch (Tag->getTagKind()) {
527 case TTK_Class:
528 TagName = "class";
529 FixItTagName = "class ";
530 break;
531
532 case TTK_Enum:
533 TagName = "enum";
534 FixItTagName = "enum ";
535 break;
536
537 case TTK_Struct:
538 TagName = "struct";
539 FixItTagName = "struct ";
540 break;
541
Joao Matos6666ed42012-08-31 18:45:21 +0000542 case TTK_Interface:
543 TagName = "__interface";
544 FixItTagName = "__interface ";
545 break;
546
Kaelyn Uhrain12f32972012-05-02 00:11:40 +0000547 case TTK_Union:
548 TagName = "union";
549 FixItTagName = "union ";
550 break;
551 }
552
553 SemaRef.Diag(NameLoc, diag::err_use_of_tag_name_without_tag)
554 << Name << TagName << SemaRef.getLangOpts().CPlusPlus
555 << FixItHint::CreateInsertion(NameLoc, FixItTagName);
556
Richard Smith69e48262012-09-06 01:37:56 +0000557 for (LookupResult::iterator I = Result.begin(), IEnd = Result.end();
558 I != IEnd; ++I)
559 SemaRef.Diag((*I)->getLocation(), diag::note_decl_hiding_tag_type)
560 << Name << TagName;
561
562 // Replace lookup results with just the tag decl.
563 Result.clear(Sema::LookupTagName);
564 SemaRef.LookupParsedName(Result, S, &SS);
Kaelyn Uhrain12f32972012-05-02 00:11:40 +0000565 return true;
566 }
567
Kaelyn Uhrain12f32972012-05-02 00:11:40 +0000568 return false;
569}
570
Richard Smith05766812012-08-18 00:55:03 +0000571/// Build a ParsedType for a simple-type-specifier with a nested-name-specifier.
572static ParsedType buildNestedType(Sema &S, CXXScopeSpec &SS,
573 QualType T, SourceLocation NameLoc) {
574 ASTContext &Context = S.Context;
575
576 TypeLocBuilder Builder;
577 Builder.pushTypeSpec(T).setNameLoc(NameLoc);
578
579 T = S.getElaboratedType(ETK_None, SS, T);
580 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T);
581 ElabTL.setElaboratedKeywordLoc(SourceLocation());
582 ElabTL.setQualifierLoc(SS.getWithLocInContext(Context));
583 return S.CreateParsedType(T, Builder.getTypeSourceInfo(Context, T));
584}
585
Douglas Gregor312eadb2011-04-24 05:37:28 +0000586Sema::NameClassification Sema::ClassifyName(Scope *S,
587 CXXScopeSpec &SS,
588 IdentifierInfo *&Name,
589 SourceLocation NameLoc,
Richard Smith05766812012-08-18 00:55:03 +0000590 const Token &NextToken,
591 bool IsAddressOfOperand,
592 CorrectionCandidateCallback *CCC) {
Douglas Gregor312eadb2011-04-24 05:37:28 +0000593 DeclarationNameInfo NameInfo(Name, NameLoc);
594 ObjCMethodDecl *CurMethod = getCurMethodDecl();
595
596 if (NextToken.is(tok::coloncolon)) {
597 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(),
598 QualType(), false, SS, 0, false);
599
600 }
601
602 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName);
603 LookupParsedName(Result, S, &SS, !CurMethod);
604
605 // Perform lookup for Objective-C instance variables (including automatically
606 // synthesized instance variables), if we're in an Objective-C method.
607 // FIXME: This lookup really, really needs to be folded in to the normal
608 // unqualified lookup mechanism.
609 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) {
610 ExprResult E = LookupInObjCMethod(Result, S, Name, true);
Douglas Gregorec385cf2011-04-25 15:05:41 +0000611 if (E.get() || E.isInvalid())
Douglas Gregor312eadb2011-04-24 05:37:28 +0000612 return E;
Douglas Gregor312eadb2011-04-24 05:37:28 +0000613 }
614
615 bool SecondTry = false;
616 bool IsFilteredTemplateName = false;
617
618Corrected:
619 switch (Result.getResultKind()) {
620 case LookupResult::NotFound:
621 // If an unqualified-id is followed by a '(', then we have a function
622 // call.
623 if (!SS.isSet() && NextToken.is(tok::l_paren)) {
624 // In C++, this is an ADL-only call.
625 // FIXME: Reference?
David Blaikie4e4d0842012-03-11 07:00:24 +0000626 if (getLangOpts().CPlusPlus)
Douglas Gregor312eadb2011-04-24 05:37:28 +0000627 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true);
628
629 // C90 6.3.2.2:
630 // If the expression that precedes the parenthesized argument list in a
631 // function call consists solely of an identifier, and if no
632 // declaration is visible for this identifier, the identifier is
633 // implicitly declared exactly as if, in the innermost block containing
634 // the function call, the declaration
635 //
636 // extern int identifier ();
637 //
638 // appeared.
639 //
640 // We also allow this in C99 as an extension.
641 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) {
642 Result.addDecl(D);
643 Result.resolveKind();
644 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false);
645 }
646 }
647
648 // In C, we first see whether there is a tag type by the same name, in
649 // which case it's likely that the user just forget to write "enum",
650 // "struct", or "union".
Kaelyn Uhrain12f32972012-05-02 00:11:40 +0000651 if (!getLangOpts().CPlusPlus && !SecondTry &&
652 isTagTypeWithMissingTag(*this, Result, S, SS, Name, NameLoc)) {
653 break;
Douglas Gregor312eadb2011-04-24 05:37:28 +0000654 }
655
656 // Perform typo correction to determine if there is another name that is
657 // close to this name.
Richard Smith05766812012-08-18 00:55:03 +0000658 if (!SecondTry && CCC) {
Douglas Gregor3a348c82011-07-14 04:54:23 +0000659 SecondTry = true;
Douglas Gregord8bba9c2011-06-28 16:20:02 +0000660 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(),
David Blaikied662a792011-10-19 22:56:21 +0000661 Result.getLookupKind(), S,
Richard Smith05766812012-08-18 00:55:03 +0000662 &SS, *CCC)) {
Douglas Gregor27766d22011-04-27 03:47:06 +0000663 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest;
664 unsigned QualifiedDiag = diag::err_no_member_suggest;
David Blaikie4e4d0842012-03-11 07:00:24 +0000665 std::string CorrectedStr(Corrected.getAsString(getLangOpts()));
666 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOpts()));
Douglas Gregor27766d22011-04-27 03:47:06 +0000667
Douglas Gregord8bba9c2011-06-28 16:20:02 +0000668 NamedDecl *FirstDecl = Corrected.getCorrectionDecl();
Douglas Gregor3b887352011-04-27 04:48:22 +0000669 NamedDecl *UnderlyingFirstDecl
670 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0;
David Blaikie4e4d0842012-03-11 07:00:24 +0000671 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) &&
Douglas Gregor3b887352011-04-27 04:48:22 +0000672 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) {
Douglas Gregor27766d22011-04-27 03:47:06 +0000673 UnqualifiedDiag = diag::err_no_template_suggest;
674 QualifiedDiag = diag::err_no_member_template_suggest;
Douglas Gregor3b887352011-04-27 04:48:22 +0000675 } else if (UnderlyingFirstDecl &&
676 (isa<TypeDecl>(UnderlyingFirstDecl) ||
677 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) ||
678 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) {
Douglas Gregor27766d22011-04-27 03:47:06 +0000679 UnqualifiedDiag = diag::err_unknown_typename_suggest;
680 QualifiedDiag = diag::err_unknown_nested_typename_suggest;
681 }
Douglas Gregord8bba9c2011-06-28 16:20:02 +0000682
Douglas Gregor312eadb2011-04-24 05:37:28 +0000683 if (SS.isEmpty())
Douglas Gregor27766d22011-04-27 03:47:06 +0000684 Diag(NameLoc, UnqualifiedDiag)
Douglas Gregord8bba9c2011-06-28 16:20:02 +0000685 << Name << CorrectedQuotedStr
686 << FixItHint::CreateReplacement(NameLoc, CorrectedStr);
David Blaikie6952c012012-10-12 20:00:44 +0000687 else // FIXME: is this even reachable? Test it.
Douglas Gregor27766d22011-04-27 03:47:06 +0000688 Diag(NameLoc, QualifiedDiag)
Douglas Gregord8bba9c2011-06-28 16:20:02 +0000689 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr
Douglas Gregor312eadb2011-04-24 05:37:28 +0000690 << SS.getRange()
David Blaikie6952c012012-10-12 20:00:44 +0000691 << FixItHint::CreateReplacement(Corrected.getCorrectionRange(),
692 CorrectedStr);
Douglas Gregor312eadb2011-04-24 05:37:28 +0000693
694 // Update the name, so that the caller has the new name.
Douglas Gregord8bba9c2011-06-28 16:20:02 +0000695 Name = Corrected.getCorrectionAsIdentifierInfo();
Douglas Gregor312eadb2011-04-24 05:37:28 +0000696
Kaelyn Uhraina5ee6342012-01-24 19:45:35 +0000697 // Typo correction corrected to a keyword.
698 if (Corrected.isKeyword())
699 return Corrected.getCorrectionAsIdentifierInfo();
700
Douglas Gregord8bba9c2011-06-28 16:20:02 +0000701 // Also update the LookupResult...
702 // FIXME: This should probably go away at some point
703 Result.clear();
704 Result.setLookupName(Corrected.getCorrection());
Kaelyn Uhraina5ee6342012-01-24 19:45:35 +0000705 if (FirstDecl) {
706 Result.addDecl(FirstDecl);
Douglas Gregor3a348c82011-07-14 04:54:23 +0000707 Diag(FirstDecl->getLocation(), diag::note_previous_decl)
708 << CorrectedQuotedStr;
Kaelyn Uhraina5ee6342012-01-24 19:45:35 +0000709 }
Douglas Gregor312eadb2011-04-24 05:37:28 +0000710
711 // If we found an Objective-C instance variable, let
712 // LookupInObjCMethod build the appropriate expression to
713 // reference the ivar.
714 // FIXME: This is a gross hack.
715 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) {
716 Result.clear();
717 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier()));
Benjamin Kramer3fe198b2012-08-23 21:35:17 +0000718 return E;
Douglas Gregor312eadb2011-04-24 05:37:28 +0000719 }
720
721 goto Corrected;
722 }
723 }
724
725 // We failed to correct; just fall through and let the parser deal with it.
726 Result.suppressDiagnostics();
727 return NameClassification::Unknown();
728
Abramo Bagnarae4b92762012-01-27 09:46:47 +0000729 case LookupResult::NotFoundInCurrentInstantiation: {
Douglas Gregor312eadb2011-04-24 05:37:28 +0000730 // We performed name lookup into the current instantiation, and there were
731 // dependent bases, so we treat this result the same way as any other
732 // dependent nested-name-specifier.
733
734 // C++ [temp.res]p2:
735 // A name used in a template declaration or definition and that is
736 // dependent on a template-parameter is assumed not to name a type
737 // unless the applicable name lookup finds a type name or the name is
738 // qualified by the keyword typename.
739 //
740 // FIXME: If the next token is '<', we might want to ask the parser to
741 // perform some heroics to see if we actually have a
742 // template-argument-list, which would indicate a missing 'template'
743 // keyword here.
Richard Smith05766812012-08-18 00:55:03 +0000744 return ActOnDependentIdExpression(SS, /*TemplateKWLoc=*/SourceLocation(),
745 NameInfo, IsAddressOfOperand,
746 /*TemplateArgs=*/0);
Abramo Bagnarae4b92762012-01-27 09:46:47 +0000747 }
Douglas Gregor312eadb2011-04-24 05:37:28 +0000748
749 case LookupResult::Found:
750 case LookupResult::FoundOverloaded:
751 case LookupResult::FoundUnresolvedValue:
752 break;
753
754 case LookupResult::Ambiguous:
David Blaikie4e4d0842012-03-11 07:00:24 +0000755 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) &&
Douglas Gregor3b887352011-04-27 04:48:22 +0000756 hasAnyAcceptableTemplateNames(Result)) {
Douglas Gregor312eadb2011-04-24 05:37:28 +0000757 // C++ [temp.local]p3:
758 // A lookup that finds an injected-class-name (10.2) can result in an
759 // ambiguity in certain cases (for example, if it is found in more than
760 // one base class). If all of the injected-class-names that are found
761 // refer to specializations of the same class template, and if the name
762 // is followed by a template-argument-list, the reference refers to the
763 // class template itself and not a specialization thereof, and is not
764 // ambiguous.
765 //
766 // This filtering can make an ambiguous result into an unambiguous one,
767 // so try again after filtering out template names.
768 FilterAcceptableTemplateNames(Result);
769 if (!Result.isAmbiguous()) {
770 IsFilteredTemplateName = true;
771 break;
772 }
773 }
774
775 // Diagnose the ambiguity and return an error.
776 return NameClassification::Error();
777 }
778
David Blaikie4e4d0842012-03-11 07:00:24 +0000779 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) &&
Douglas Gregor312eadb2011-04-24 05:37:28 +0000780 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) {
781 // C++ [temp.names]p3:
782 // After name lookup (3.4) finds that a name is a template-name or that
783 // an operator-function-id or a literal- operator-id refers to a set of
784 // overloaded functions any member of which is a function template if
785 // this is followed by a <, the < is always taken as the delimiter of a
786 // template-argument-list and never as the less-than operator.
787 if (!IsFilteredTemplateName)
788 FilterAcceptableTemplateNames(Result);
789
Douglas Gregor3b887352011-04-27 04:48:22 +0000790 if (!Result.empty()) {
791 bool IsFunctionTemplate;
792 TemplateName Template;
793 if (Result.end() - Result.begin() > 1) {
794 IsFunctionTemplate = true;
795 Template = Context.getOverloadedTemplateName(Result.begin(),
796 Result.end());
797 } else {
798 TemplateDecl *TD
799 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl());
800 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD);
801
802 if (SS.isSet() && !SS.isInvalid())
803 Template = Context.getQualifiedTemplateName(SS.getScopeRep(),
Douglas Gregor312eadb2011-04-24 05:37:28 +0000804 /*TemplateKeyword=*/false,
Douglas Gregor3b887352011-04-27 04:48:22 +0000805 TD);
806 else
807 Template = TemplateName(TD);
808 }
Douglas Gregor312eadb2011-04-24 05:37:28 +0000809
Douglas Gregor3b887352011-04-27 04:48:22 +0000810 if (IsFunctionTemplate) {
811 // Function templates always go through overload resolution, at which
812 // point we'll perform the various checks (e.g., accessibility) we need
813 // to based on which function we selected.
814 Result.suppressDiagnostics();
815
816 return NameClassification::FunctionTemplate(Template);
817 }
818
819 return NameClassification::TypeTemplate(Template);
Douglas Gregor312eadb2011-04-24 05:37:28 +0000820 }
Douglas Gregor312eadb2011-04-24 05:37:28 +0000821 }
Richard Smith05766812012-08-18 00:55:03 +0000822
Douglas Gregor3b887352011-04-27 04:48:22 +0000823 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl();
Douglas Gregor312eadb2011-04-24 05:37:28 +0000824 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) {
825 DiagnoseUseOfDecl(Type, NameLoc);
826 QualType T = Context.getTypeDeclType(Type);
Richard Smith05766812012-08-18 00:55:03 +0000827 if (SS.isNotEmpty())
828 return buildNestedType(*this, SS, T, NameLoc);
Kaelyn Uhrain12f32972012-05-02 00:11:40 +0000829 return ParsedType::make(T);
Douglas Gregor312eadb2011-04-24 05:37:28 +0000830 }
Richard Smith05766812012-08-18 00:55:03 +0000831
Douglas Gregor312eadb2011-04-24 05:37:28 +0000832 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl);
833 if (!Class) {
834 // FIXME: It's unfortunate that we don't have a Type node for handling this.
835 if (ObjCCompatibleAliasDecl *Alias
836 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl))
837 Class = Alias->getClassInterface();
838 }
839
840 if (Class) {
841 DiagnoseUseOfDecl(Class, NameLoc);
842
843 if (NextToken.is(tok::period)) {
844 // Interface. <something> is parsed as a property reference expression.
845 // Just return "unknown" as a fall-through for now.
846 Result.suppressDiagnostics();
847 return NameClassification::Unknown();
848 }
849
850 QualType T = Context.getObjCInterfaceType(Class);
851 return ParsedType::make(T);
852 }
Kaelyn Uhrain12f32972012-05-02 00:11:40 +0000853
Richard Smith05766812012-08-18 00:55:03 +0000854 // We can have a type template here if we're classifying a template argument.
855 if (isa<TemplateDecl>(FirstDecl) && !isa<FunctionTemplateDecl>(FirstDecl))
856 return NameClassification::TypeTemplate(
857 TemplateName(cast<TemplateDecl>(FirstDecl)));
858
Kaelyn Uhrain12f32972012-05-02 00:11:40 +0000859 // Check for a tag type hidden by a non-type decl in a few cases where it
860 // seems likely a type is wanted instead of the non-type that was found.
Richard Smith05766812012-08-18 00:55:03 +0000861 if (!getLangOpts().ObjC1) {
Kaelyn Uhrain12f32972012-05-02 00:11:40 +0000862 bool NextIsOp = NextToken.is(tok::amp) || NextToken.is(tok::star);
863 if ((NextToken.is(tok::identifier) ||
864 (NextIsOp && FirstDecl->isFunctionOrFunctionTemplate())) &&
865 isTagTypeWithMissingTag(*this, Result, S, SS, Name, NameLoc)) {
Richard Smith69e48262012-09-06 01:37:56 +0000866 TypeDecl *Type = Result.getAsSingle<TypeDecl>();
867 DiagnoseUseOfDecl(Type, NameLoc);
868 QualType T = Context.getTypeDeclType(Type);
869 if (SS.isNotEmpty())
870 return buildNestedType(*this, SS, T, NameLoc);
871 return ParsedType::make(T);
Kaelyn Uhrain12f32972012-05-02 00:11:40 +0000872 }
873 }
Douglas Gregor312eadb2011-04-24 05:37:28 +0000874
Richard Smith05766812012-08-18 00:55:03 +0000875 if (FirstDecl->isCXXClassMember())
Abramo Bagnarae4b92762012-01-27 09:46:47 +0000876 return BuildPossibleImplicitMemberExpr(SS, SourceLocation(), Result, 0);
Douglas Gregor3b887352011-04-27 04:48:22 +0000877
Douglas Gregor312eadb2011-04-24 05:37:28 +0000878 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren));
879 return BuildDeclarationNameExpr(SS, Result, ADL);
880}
881
John McCall88232aa2009-08-18 00:00:49 +0000882// Determines the context to return to after temporarily entering a
883// context. This depends in an unnecessarily complicated way on the
884// exact ordering of callbacks from the parser.
Argyrios Kyrtzidisef6e6472008-11-08 17:17:31 +0000885DeclContext *Sema::getContainingDC(DeclContext *DC) {
Argyrios Kyrtzidisef6e6472008-11-08 17:17:31 +0000886
John McCall88232aa2009-08-18 00:00:49 +0000887 // Functions defined inline within classes aren't parsed until we've
888 // finished parsing the top-level class, so the top-level class is
889 // the context we'll need to return to.
890 if (isa<FunctionDecl>(DC)) {
891 DC = DC->getLexicalParent();
892
893 // A function not defined within a class will always return to its
894 // lexical context.
895 if (!isa<CXXRecordDecl>(DC))
896 return DC;
897
898 // A C++ inline method/friend is parsed *after* the topmost class
899 // it was declared in is fully parsed ("complete"); the topmost
900 // class is the context we need to return to.
Argyrios Kyrtzidis77407b82008-11-19 18:01:13 +0000901 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent()))
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000902 DC = RD;
903
904 // Return the declaration context of the topmost class the inline method is
905 // declared in.
906 return DC;
907 }
908
Argyrios Kyrtzidis77407b82008-11-19 18:01:13 +0000909 return DC->getLexicalParent();
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000910}
911
Douglas Gregor44b43212008-12-11 16:49:14 +0000912void Sema::PushDeclContext(Scope *S, DeclContext *DC) {
Argyrios Kyrtzidisef6e6472008-11-08 17:17:31 +0000913 assert(getContainingDC(DC) == CurContext &&
Zhongxing Xue50897a2008-12-08 07:14:51 +0000914 "The next DeclContext should be lexically contained in the current one.");
Chris Lattner9fdf9c62008-04-22 18:39:57 +0000915 CurContext = DC;
Douglas Gregor44b43212008-12-11 16:49:14 +0000916 S->setEntity(DC);
Chris Lattner0ed844b2008-04-04 06:12:32 +0000917}
918
Chris Lattnerb048c982008-04-06 04:47:34 +0000919void Sema::PopDeclContext() {
920 assert(CurContext && "DeclContext imbalance!");
Douglas Gregor44b43212008-12-11 16:49:14 +0000921
Argyrios Kyrtzidisef6e6472008-11-08 17:17:31 +0000922 CurContext = getContainingDC(CurContext);
John McCallacb70392010-07-23 22:45:07 +0000923 assert(CurContext && "Popped translation unit!");
Chris Lattner0ed844b2008-04-04 06:12:32 +0000924}
925
Argyrios Kyrtzidis179fe1a2009-06-17 23:19:02 +0000926/// EnterDeclaratorContext - Used when we must lookup names in the context
927/// of a declarator's nested name specifier.
John McCall7a1dc562009-12-19 10:49:29 +0000928///
Argyrios Kyrtzidis1d175532009-06-17 23:15:40 +0000929void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) {
John McCall7a1dc562009-12-19 10:49:29 +0000930 // C++0x [basic.lookup.unqual]p13:
931 // A name used in the definition of a static data member of class
932 // X (after the qualified-id of the static member) is looked up as
933 // if the name was used in a member function of X.
934 // C++0x [basic.lookup.unqual]p14:
935 // If a variable member of a namespace is defined outside of the
936 // scope of its namespace then any name used in the definition of
937 // the variable member (after the declarator-id) is looked up as
938 // if the definition of the variable member occurred in its
939 // namespace.
940 // Both of these imply that we should push a scope whose context
941 // is the semantic context of the declaration. We can't use
942 // PushDeclContext here because that context is not necessarily
943 // lexically contained in the current context. Fortunately,
944 // the containing scope should have the appropriate information.
945
946 assert(!S->getEntity() && "scope already has entity");
947
948#ifndef NDEBUG
949 Scope *Ancestor = S->getParent();
950 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent();
951 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch");
952#endif
953
Argyrios Kyrtzidis1d175532009-06-17 23:15:40 +0000954 CurContext = DC;
John McCall7a1dc562009-12-19 10:49:29 +0000955 S->setEntity(DC);
Argyrios Kyrtzidis1d175532009-06-17 23:15:40 +0000956}
957
Argyrios Kyrtzidis1d175532009-06-17 23:15:40 +0000958void Sema::ExitDeclaratorContext(Scope *S) {
John McCall7a1dc562009-12-19 10:49:29 +0000959 assert(S->getEntity() == CurContext && "Context imbalance!");
Argyrios Kyrtzidis1d175532009-06-17 23:15:40 +0000960
John McCall7a1dc562009-12-19 10:49:29 +0000961 // Switch back to the lexical context. The safety of this is
962 // enforced by an assert in EnterDeclaratorContext.
963 Scope *Ancestor = S->getParent();
964 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent();
965 CurContext = (DeclContext*) Ancestor->getEntity();
966
967 // We don't need to do anything with the scope, which is going to
968 // disappear.
Argyrios Kyrtzidis1d175532009-06-17 23:15:40 +0000969}
970
Caitlin Sadowskied9d84a2011-09-08 17:42:31 +0000971
972void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) {
973 FunctionDecl *FD = dyn_cast<FunctionDecl>(D);
974 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) {
975 // We assume that the caller has already called
976 // ActOnReenterTemplateScope
977 FD = TFD->getTemplatedDecl();
978 }
979 if (!FD)
980 return;
981
DeLesley Hutchinscf2fa2f2012-04-06 15:10:17 +0000982 // Same implementation as PushDeclContext, but enters the context
983 // from the lexical parent, rather than the top-level class.
984 assert(CurContext == FD->getLexicalParent() &&
985 "The next DeclContext should be lexically contained in the current one.");
986 CurContext = FD;
987 S->setEntity(CurContext);
988
Caitlin Sadowskied9d84a2011-09-08 17:42:31 +0000989 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) {
990 ParmVarDecl *Param = FD->getParamDecl(P);
991 // If the parameter has an identifier, then add it to the scope
992 if (Param->getIdentifier()) {
993 S->AddDecl(Param);
994 IdResolver.AddDecl(Param);
995 }
996 }
997}
998
999
DeLesley Hutchinscf2fa2f2012-04-06 15:10:17 +00001000void Sema::ActOnExitFunctionContext() {
1001 // Same implementation as PopDeclContext, but returns to the lexical parent,
1002 // rather than the top-level class.
1003 assert(CurContext && "DeclContext imbalance!");
1004 CurContext = CurContext->getLexicalParent();
1005 assert(CurContext && "Popped translation unit!");
1006}
1007
1008
Douglas Gregorf9201e02009-02-11 23:02:49 +00001009/// \brief Determine whether we allow overloading of the function
1010/// PrevDecl with another declaration.
1011///
1012/// This routine determines whether overloading is possible, not
1013/// whether some new function is actually an overload. It will return
1014/// true in C++ (where we can always provide overloads) or, as an
1015/// extension, in C when the previous function is already an
1016/// overloaded function declaration or has the "overloadable"
1017/// attribute.
John McCall68263142009-11-18 22:49:29 +00001018static bool AllowOverloadingOfFunction(LookupResult &Previous,
1019 ASTContext &Context) {
David Blaikie4e4d0842012-03-11 07:00:24 +00001020 if (Context.getLangOpts().CPlusPlus)
Douglas Gregorf9201e02009-02-11 23:02:49 +00001021 return true;
1022
John McCall68263142009-11-18 22:49:29 +00001023 if (Previous.getResultKind() == LookupResult::FoundOverloaded)
Douglas Gregorf9201e02009-02-11 23:02:49 +00001024 return true;
1025
John McCall68263142009-11-18 22:49:29 +00001026 return (Previous.getResultKind() == LookupResult::Found
1027 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>());
Douglas Gregorf9201e02009-02-11 23:02:49 +00001028}
1029
Argyrios Kyrtzidis87f3ff02008-04-12 00:47:19 +00001030/// Add this decl to the scope shadowed decl chains.
John McCallab88d972009-08-31 22:39:49 +00001031void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) {
Douglas Gregor074149e2009-01-05 19:45:36 +00001032 // Move up the scope chain until we find the nearest enclosing
1033 // non-transparent context. The declaration will be introduced into this
1034 // scope.
Mike Stump1eb44332009-09-09 15:08:12 +00001035 while (S->getEntity() &&
Douglas Gregor074149e2009-01-05 19:45:36 +00001036 ((DeclContext *)S->getEntity())->isTransparentContext())
1037 S = S->getParent();
1038
Douglas Gregor6ed40e32008-12-23 21:05:05 +00001039 // Add scoped declarations into their context, so that they can be
1040 // found later. Declarations without a context won't be inserted
1041 // into any context.
John McCallab88d972009-08-31 22:39:49 +00001042 if (AddToContext)
1043 CurContext->addDecl(D);
Douglas Gregor6ed40e32008-12-23 21:05:05 +00001044
Chandler Carruth8761d682010-02-21 07:08:09 +00001045 // Out-of-line definitions shouldn't be pushed into scope in C++.
1046 // Out-of-line variable and function definitions shouldn't even in C.
David Blaikie4e4d0842012-03-11 07:00:24 +00001047 if ((getLangOpts().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) &&
Douglas Gregor6d0468b2011-10-09 22:57:49 +00001048 D->isOutOfLine() &&
1049 !D->getDeclContext()->getRedeclContext()->Equals(
1050 D->getLexicalDeclContext()->getRedeclContext()))
Chandler Carruth8761d682010-02-21 07:08:09 +00001051 return;
1052
1053 // Template instantiations should also not be pushed into scope.
1054 if (isa<FunctionDecl>(D) &&
1055 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization())
Douglas Gregord04b1be2009-09-28 18:41:37 +00001056 return;
1057
John McCallf36e02d2009-10-09 21:13:30 +00001058 // If this replaces anything in the current scope,
1059 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()),
1060 IEnd = IdResolver.end();
1061 for (; I != IEnd; ++I) {
John McCalld226f652010-08-21 09:40:31 +00001062 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) {
1063 S->RemoveDecl(*I);
John McCallf36e02d2009-10-09 21:13:30 +00001064 IdResolver.RemoveDecl(*I);
Argyrios Kyrtzidis00bc6452008-05-09 23:39:43 +00001065
John McCallf36e02d2009-10-09 21:13:30 +00001066 // Should only need to replace one decl.
1067 break;
Douglas Gregor516ff432009-04-24 02:57:34 +00001068 }
Argyrios Kyrtzidis00bc6452008-05-09 23:39:43 +00001069 }
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00001070
John McCalld226f652010-08-21 09:40:31 +00001071 S->AddDecl(D);
Douglas Gregor7cbc5582011-03-14 21:19:51 +00001072
1073 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) {
1074 // Implicitly-generated labels may end up getting generated in an order that
1075 // isn't strictly lexical, which breaks name lookup. Be careful to insert
1076 // the label at the appropriate place in the identifier chain.
1077 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) {
Douglas Gregor1d2de762011-03-24 14:35:16 +00001078 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext();
Douglas Gregor250e7a72011-03-16 16:39:03 +00001079 if (IDC == CurContext) {
1080 if (!S->isDeclScope(*I))
1081 continue;
1082 } else if (IDC->Encloses(CurContext))
Douglas Gregor7cbc5582011-03-14 21:19:51 +00001083 break;
1084 }
1085
Douglas Gregor250e7a72011-03-16 16:39:03 +00001086 IdResolver.InsertDeclAfter(I, D);
Douglas Gregor7cbc5582011-03-14 21:19:51 +00001087 } else {
1088 IdResolver.AddDecl(D);
1089 }
Argyrios Kyrtzidis87f3ff02008-04-12 00:47:19 +00001090}
1091
Douglas Gregoreee242f2011-10-27 09:33:13 +00001092void Sema::pushExternalDeclIntoScope(NamedDecl *D, DeclarationName Name) {
1093 if (IdResolver.tryAddTopLevelDecl(D, Name) && TUScope)
1094 TUScope->AddDecl(D);
1095}
1096
Douglas Gregorcc209452011-03-07 16:54:27 +00001097bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S,
1098 bool ExplicitInstantiationOrSpecialization) {
Nico Weber355a1662012-12-17 03:51:09 +00001099 return IdResolver.isDeclInScope(D, Ctx, S,
Douglas Gregorcc209452011-03-07 16:54:27 +00001100 ExplicitInstantiationOrSpecialization);
Douglas Gregor2531c2d2009-09-28 00:47:05 +00001101}
1102
John McCall5f1e0942010-08-24 08:50:51 +00001103Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) {
1104 DeclContext *TargetDC = DC->getPrimaryContext();
1105 do {
1106 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity())
1107 if (ScopeDC->getPrimaryContext() == TargetDC)
1108 return S;
1109 } while ((S = S->getParent()));
1110
1111 return 0;
1112}
1113
John McCall68263142009-11-18 22:49:29 +00001114static bool isOutOfScopePreviousDeclaration(NamedDecl *,
1115 DeclContext*,
1116 ASTContext&);
1117
1118/// Filters out lookup results that don't fall within the given scope
1119/// as determined by isDeclInScope.
Richard Smith3e4c6c42011-05-05 21:57:07 +00001120void Sema::FilterLookupForScope(LookupResult &R,
1121 DeclContext *Ctx, Scope *S,
1122 bool ConsiderLinkage,
1123 bool ExplicitInstantiationOrSpecialization) {
John McCall68263142009-11-18 22:49:29 +00001124 LookupResult::Filter F = R.makeFilter();
1125 while (F.hasNext()) {
1126 NamedDecl *D = F.next();
1127
Richard Smith3e4c6c42011-05-05 21:57:07 +00001128 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization))
John McCall68263142009-11-18 22:49:29 +00001129 continue;
1130
1131 if (ConsiderLinkage &&
Richard Smith3e4c6c42011-05-05 21:57:07 +00001132 isOutOfScopePreviousDeclaration(D, Ctx, Context))
John McCall68263142009-11-18 22:49:29 +00001133 continue;
1134
1135 F.erase();
1136 }
1137
1138 F.done();
1139}
1140
1141static bool isUsingDecl(NamedDecl *D) {
1142 return isa<UsingShadowDecl>(D) ||
1143 isa<UnresolvedUsingTypenameDecl>(D) ||
1144 isa<UnresolvedUsingValueDecl>(D);
1145}
1146
1147/// Removes using shadow declarations from the lookup results.
1148static void RemoveUsingDecls(LookupResult &R) {
1149 LookupResult::Filter F = R.makeFilter();
1150 while (F.hasNext())
1151 if (isUsingDecl(F.next()))
1152 F.erase();
1153
1154 F.done();
1155}
1156
Argyrios Kyrtzidis06999f82010-08-15 10:17:33 +00001157/// \brief Check for this common pattern:
1158/// @code
1159/// class S {
1160/// S(const S&); // DO NOT IMPLEMENT
1161/// void operator=(const S&); // DO NOT IMPLEMENT
1162/// };
1163/// @endcode
1164static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) {
1165 // FIXME: Should check for private access too but access is set after we get
1166 // the decl here.
Sean Hunt10620eb2011-05-06 20:44:56 +00001167 if (D->doesThisDeclarationHaveABody())
Argyrios Kyrtzidis06999f82010-08-15 10:17:33 +00001168 return false;
1169
1170 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D))
1171 return CD->isCopyConstructor();
Douglas Gregor27c08ab2010-09-27 22:06:20 +00001172 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D))
1173 return Method->isCopyAssignmentOperator();
1174 return false;
Argyrios Kyrtzidis06999f82010-08-15 10:17:33 +00001175}
1176
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00001177bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const {
1178 assert(D);
Argyrios Kyrtzidisf6d1d432010-08-13 18:42:29 +00001179
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00001180 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>())
1181 return false;
1182
1183 // Ignore class templates.
Chandler Carruthef9d09c2011-01-03 19:27:19 +00001184 if (D->getDeclContext()->isDependentContext() ||
1185 D->getLexicalDeclContext()->isDependentContext())
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00001186 return false;
1187
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00001188 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
Argyrios Kyrtzidis06999f82010-08-15 10:17:33 +00001189 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation)
1190 return false;
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00001191
Argyrios Kyrtzidis06999f82010-08-15 10:17:33 +00001192 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
1193 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD))
1194 return false;
1195 } else {
1196 // 'static inline' functions are used in headers; don't warn.
John McCalld931b082010-08-26 03:08:43 +00001197 if (FD->getStorageClass() == SC_Static &&
Argyrios Kyrtzidis06999f82010-08-15 10:17:33 +00001198 FD->isInlineSpecified())
1199 return false;
1200 }
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00001201
Sean Hunt10620eb2011-05-06 20:44:56 +00001202 if (FD->doesThisDeclarationHaveABody() &&
John McCall82b96592010-10-27 01:41:35 +00001203 Context.DeclMustBeEmitted(FD))
1204 return false;
John McCall82b96592010-10-27 01:41:35 +00001205 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
Richard Smithc36e3592012-10-28 07:39:29 +00001206 // Don't warn on variables of const-qualified or reference type, since their
1207 // values can be used even if though they're not odr-used, and because const
1208 // qualified variables can appear in headers in contexts where they're not
1209 // intended to be used.
1210 // FIXME: Use more principled rules for these exemptions.
John McCall82b96592010-10-27 01:41:35 +00001211 if (!VD->isFileVarDecl() ||
Richard Smithc36e3592012-10-28 07:39:29 +00001212 VD->getType().isConstQualified() ||
1213 VD->getType()->isReferenceType() ||
John McCall82b96592010-10-27 01:41:35 +00001214 Context.DeclMustBeEmitted(VD))
1215 return false;
1216
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00001217 if (VD->isStaticDataMember() &&
1218 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation)
1219 return false;
1220
John McCall82b96592010-10-27 01:41:35 +00001221 } else {
1222 return false;
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00001223 }
1224
John McCall82b96592010-10-27 01:41:35 +00001225 // Only warn for unused decls internal to the translation unit.
1226 if (D->getLinkage() == ExternalLinkage)
1227 return false;
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00001228
John McCall82b96592010-10-27 01:41:35 +00001229 return true;
1230}
1231
1232void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) {
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00001233 if (!D)
1234 return;
1235
1236 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
1237 const FunctionDecl *First = FD->getFirstDeclaration();
1238 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First))
1239 return; // First should already be in the vector.
1240 }
1241
1242 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
1243 const VarDecl *First = VD->getFirstDeclaration();
1244 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First))
1245 return; // First should already be in the vector.
1246 }
1247
David Blaikie7f7c42b2012-05-26 05:35:39 +00001248 if (ShouldWarnIfUnusedFileScopedDecl(D))
1249 UnusedFileScopedDecls.push_back(D);
1250}
Argyrios Kyrtzidis49b96d12010-08-13 18:42:17 +00001251
Anders Carlsson99a000e2009-11-07 07:18:14 +00001252static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) {
John McCall86ff3082010-02-04 22:26:26 +00001253 if (D->isInvalidDecl())
1254 return false;
1255
Eli Friedmandd9d6452012-01-13 23:41:25 +00001256 if (D->isReferenced() || D->isUsed() || D->hasAttr<UnusedAttr>())
Anders Carlssonf7613d52009-11-07 07:26:56 +00001257 return false;
John McCall86ff3082010-02-04 22:26:26 +00001258
Chris Lattner57ad3782011-02-17 20:34:02 +00001259 if (isa<LabelDecl>(D))
1260 return true;
1261
John McCall86ff3082010-02-04 22:26:26 +00001262 // White-list anything that isn't a local variable.
1263 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) ||
1264 !D->getDeclContext()->isFunctionOrMethod())
1265 return false;
1266
1267 // Types of valid local variables should be complete, so this should succeed.
Rafael Espindola1a5d3552012-01-06 04:54:01 +00001268 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
John McCallaec58602010-03-31 02:47:45 +00001269
1270 // White-list anything with an __attribute__((unused)) type.
1271 QualType Ty = VD->getType();
1272
1273 // Only look at the outermost level of typedef.
Douglas Gregor2c8e81e2012-09-14 05:10:40 +00001274 if (const TypedefType *TT = Ty->getAs<TypedefType>()) {
John McCallaec58602010-03-31 02:47:45 +00001275 if (TT->getDecl()->hasAttr<UnusedAttr>())
1276 return false;
1277 }
1278
Douglas Gregor5764f612010-05-08 23:05:03 +00001279 // If we failed to complete the type for some reason, or if the type is
1280 // dependent, don't diagnose the variable.
1281 if (Ty->isIncompleteType() || Ty->isDependentType())
Douglas Gregora6a292b2010-04-27 16:20:13 +00001282 return false;
1283
John McCallaec58602010-03-31 02:47:45 +00001284 if (const TagType *TT = Ty->getAs<TagType>()) {
1285 const TagDecl *Tag = TT->getDecl();
1286 if (Tag->hasAttr<UnusedAttr>())
1287 return false;
1288
1289 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) {
Rafael Espindola1a5d3552012-01-06 04:54:01 +00001290 if (!RD->hasTrivialDestructor())
Anders Carlssonf7613d52009-11-07 07:26:56 +00001291 return false;
Rafael Espindola1a5d3552012-01-06 04:54:01 +00001292
1293 if (const Expr *Init = VD->getInit()) {
David Blaikie39e17762012-10-24 21:29:06 +00001294 if (const ExprWithCleanups *Cleanups = dyn_cast<ExprWithCleanups>(Init))
1295 Init = Cleanups->getSubExpr();
Rafael Espindola1a5d3552012-01-06 04:54:01 +00001296 const CXXConstructExpr *Construct =
1297 dyn_cast<CXXConstructExpr>(Init);
1298 if (Construct && !Construct->isElidable()) {
1299 CXXConstructorDecl *CD = Construct->getConstructor();
1300 if (!CD->isTrivial())
1301 return false;
1302 }
1303 }
Anders Carlssonf7613d52009-11-07 07:26:56 +00001304 }
1305 }
John McCallaec58602010-03-31 02:47:45 +00001306
1307 // TODO: __attribute__((unused)) templates?
Anders Carlssonf7613d52009-11-07 07:26:56 +00001308 }
1309
John McCall86ff3082010-02-04 22:26:26 +00001310 return true;
Anders Carlsson99a000e2009-11-07 07:18:14 +00001311}
1312
Anna Zaksd5612a22011-07-28 20:52:06 +00001313static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx,
1314 FixItHint &Hint) {
1315 if (isa<LabelDecl>(D)) {
1316 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(),
David Blaikie4e4d0842012-03-11 07:00:24 +00001317 tok::colon, Ctx.getSourceManager(), Ctx.getLangOpts(), true);
Anna Zaksd5612a22011-07-28 20:52:06 +00001318 if (AfterColon.isInvalid())
1319 return;
1320 Hint = FixItHint::CreateRemoval(CharSourceRange::
1321 getCharRange(D->getLocStart(), AfterColon));
1322 }
1323 return;
1324}
1325
Chris Lattner337e5502011-02-18 01:27:55 +00001326/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used
1327/// unless they are marked attr(unused).
Douglas Gregor5764f612010-05-08 23:05:03 +00001328void Sema::DiagnoseUnusedDecl(const NamedDecl *D) {
Anna Zaksd5612a22011-07-28 20:52:06 +00001329 FixItHint Hint;
Douglas Gregor5764f612010-05-08 23:05:03 +00001330 if (!ShouldDiagnoseUnusedDecl(D))
1331 return;
1332
Anna Zaksd5612a22011-07-28 20:52:06 +00001333 GenerateFixForUnusedDecl(D, Context, Hint);
1334
Chris Lattner57ad3782011-02-17 20:34:02 +00001335 unsigned DiagID;
Douglas Gregor5764f612010-05-08 23:05:03 +00001336 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable())
Chris Lattner57ad3782011-02-17 20:34:02 +00001337 DiagID = diag::warn_unused_exception_param;
1338 else if (isa<LabelDecl>(D))
1339 DiagID = diag::warn_unused_label;
Douglas Gregor5764f612010-05-08 23:05:03 +00001340 else
Chris Lattner57ad3782011-02-17 20:34:02 +00001341 DiagID = diag::warn_unused_variable;
1342
Anna Zaksd5612a22011-07-28 20:52:06 +00001343 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint;
Douglas Gregor5764f612010-05-08 23:05:03 +00001344}
1345
Chris Lattner337e5502011-02-18 01:27:55 +00001346static void CheckPoppedLabel(LabelDecl *L, Sema &S) {
1347 // Verify that we have no forward references left. If so, there was a goto
1348 // or address of a label taken, but no definition of it. Label fwd
1349 // definitions are indicated with a null substmt.
1350 if (L->getStmt() == 0)
1351 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName();
1352}
1353
Steve Naroffb216c882007-10-09 22:01:59 +00001354void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) {
Chris Lattner31e05722007-08-26 06:24:45 +00001355 if (S->decl_empty()) return;
Douglas Gregor72c3f312008-12-05 18:15:24 +00001356 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) &&
Mike Stump1eb44332009-09-09 15:08:12 +00001357 "Scope shouldn't contain decls!");
Argyrios Kyrtzidis00bc6452008-05-09 23:39:43 +00001358
Reid Spencer5f016e22007-07-11 17:01:13 +00001359 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end();
1360 I != E; ++I) {
John McCalld226f652010-08-21 09:40:31 +00001361 Decl *TmpD = (*I);
Steve Naroffc752d042007-09-13 18:10:37 +00001362 assert(TmpD && "This decl didn't get pushed??");
Argyrios Kyrtzidis76435362008-06-10 01:32:09 +00001363
Douglas Gregor44b43212008-12-11 16:49:14 +00001364 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?");
1365 NamedDecl *D = cast<NamedDecl>(TmpD);
Argyrios Kyrtzidis76435362008-06-10 01:32:09 +00001366
Douglas Gregor44b43212008-12-11 16:49:14 +00001367 if (!D->getDeclName()) continue;
Chris Lattner7f925cc2008-04-11 07:00:53 +00001368
Douglas Gregorb5352cf2009-10-08 21:35:42 +00001369 // Diagnose unused variables in this scope.
Argyrios Kyrtzidis9c4eb1f2010-11-19 00:19:12 +00001370 if (!S->hasErrorOccurred())
Douglas Gregor5764f612010-05-08 23:05:03 +00001371 DiagnoseUnusedDecl(D);
1372
Chris Lattner337e5502011-02-18 01:27:55 +00001373 // If this was a forward reference to a label, verify it was defined.
1374 if (LabelDecl *LD = dyn_cast<LabelDecl>(D))
1375 CheckPoppedLabel(LD, *this);
1376
Douglas Gregor44b43212008-12-11 16:49:14 +00001377 // Remove this name from our lexical scope.
1378 IdResolver.RemoveDecl(D);
Reid Spencer5f016e22007-07-11 17:01:13 +00001379 }
1380}
1381
James Molloy16f1f712012-02-29 10:24:19 +00001382void Sema::ActOnStartFunctionDeclarator() {
1383 ++InFunctionDeclarator;
1384}
1385
1386void Sema::ActOnEndFunctionDeclarator() {
1387 assert(InFunctionDeclarator);
1388 --InFunctionDeclarator;
1389}
1390
Douglas Gregordeacbdc2010-08-11 12:19:30 +00001391/// \brief Look for an Objective-C class in the translation unit.
1392///
1393/// \param Id The name of the Objective-C class we're looking for. If
1394/// typo-correction fixes this name, the Id will be updated
1395/// to the fixed name.
1396///
1397/// \param IdLoc The location of the name in the translation unit.
1398///
James Dennett16ae9de2012-06-22 10:16:05 +00001399/// \param DoTypoCorrection If true, this routine will attempt typo correction
Douglas Gregordeacbdc2010-08-11 12:19:30 +00001400/// if there is no class with the given name.
1401///
1402/// \returns The declaration of the named Objective-C class, or NULL if the
1403/// class could not be found.
1404ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id,
1405 SourceLocation IdLoc,
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001406 bool DoTypoCorrection) {
Douglas Gregordeacbdc2010-08-11 12:19:30 +00001407 // The third "scope" argument is 0 since we aren't enabling lazy built-in
1408 // creation from this context.
1409 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName);
1410
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001411 if (!IDecl && DoTypoCorrection) {
Douglas Gregordeacbdc2010-08-11 12:19:30 +00001412 // Perform typo correction at the given location, but only if we
1413 // find an Objective-C class name.
Kaelyn Uhrain43e875d2012-01-18 21:41:41 +00001414 DeclFilterCCC<ObjCInterfaceDecl> Validator;
1415 if (TypoCorrection C = CorrectTypo(DeclarationNameInfo(Id, IdLoc),
1416 LookupOrdinaryName, TUScope, NULL,
Kaelyn Uhrain16e46dd2012-01-31 23:49:25 +00001417 Validator)) {
Kaelyn Uhrain43e875d2012-01-18 21:41:41 +00001418 IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>();
Douglas Gregordeacbdc2010-08-11 12:19:30 +00001419 Diag(IdLoc, diag::err_undef_interface_suggest)
1420 << Id << IDecl->getDeclName()
1421 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString());
1422 Diag(IDecl->getLocation(), diag::note_previous_decl)
1423 << IDecl->getDeclName();
1424
1425 Id = IDecl->getIdentifier();
1426 }
1427 }
Fariborz Jahanian3306f962012-01-12 00:18:35 +00001428 ObjCInterfaceDecl *Def = dyn_cast_or_null<ObjCInterfaceDecl>(IDecl);
1429 // This routine must always return a class definition, if any.
1430 if (Def && Def->getDefinition())
1431 Def = Def->getDefinition();
1432 return Def;
Douglas Gregordeacbdc2010-08-11 12:19:30 +00001433}
1434
Douglas Gregor1a0d31a2009-01-12 18:45:55 +00001435/// getNonFieldDeclScope - Retrieves the innermost scope, starting
1436/// from S, where a non-field would be declared. This routine copes
1437/// with the difference between C and C++ scoping rules in structs and
1438/// unions. For example, the following code is well-formed in C but
1439/// ill-formed in C++:
1440/// @code
1441/// struct S6 {
1442/// enum { BAR } e;
1443/// };
Mike Stump1eb44332009-09-09 15:08:12 +00001444///
Douglas Gregor1a0d31a2009-01-12 18:45:55 +00001445/// void test_S6() {
1446/// struct S6 a;
1447/// a.e = BAR;
1448/// }
1449/// @endcode
1450/// For the declaration of BAR, this routine will return a different
1451/// scope. The scope S will be the scope of the unnamed enumeration
1452/// within S6. In C++, this routine will return the scope associated
1453/// with S6, because the enumeration's scope is a transparent
1454/// context but structures can contain non-field names. In C, this
1455/// routine will return the translation unit scope, since the
1456/// enumeration's scope is a transparent context and structures cannot
1457/// contain non-field names.
1458Scope *Sema::getNonFieldDeclScope(Scope *S) {
1459 while (((S->getFlags() & Scope::DeclScope) == 0) ||
Mike Stump1eb44332009-09-09 15:08:12 +00001460 (S->getEntity() &&
Douglas Gregor1a0d31a2009-01-12 18:45:55 +00001461 ((DeclContext *)S->getEntity())->isTransparentContext()) ||
David Blaikie4e4d0842012-03-11 07:00:24 +00001462 (S->isClassScope() && !getLangOpts().CPlusPlus))
Douglas Gregor1a0d31a2009-01-12 18:45:55 +00001463 S = S->getParent();
1464 return S;
1465}
1466
Douglas Gregor3e41d602009-02-13 23:20:09 +00001467/// LazilyCreateBuiltin - The specified Builtin-ID was first used at
1468/// file scope. lazily create a decl for it. ForRedeclaration is true
1469/// if we're creating this built-in in anticipation of redeclaring the
1470/// built-in.
Douglas Gregor4afa39d2009-01-20 01:17:11 +00001471NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid,
Douglas Gregor3e41d602009-02-13 23:20:09 +00001472 Scope *S, bool ForRedeclaration,
1473 SourceLocation Loc) {
Reid Spencer5f016e22007-07-11 17:01:13 +00001474 Builtin::ID BID = (Builtin::ID)bid;
1475
Chris Lattner86df27b2009-06-14 00:45:47 +00001476 ASTContext::GetBuiltinTypeError Error;
Mike Stump1eb44332009-09-09 15:08:12 +00001477 QualType R = Context.GetBuiltinType(BID, Error);
Douglas Gregor370ab3f2009-02-14 01:52:53 +00001478 switch (Error) {
Chris Lattner86df27b2009-06-14 00:45:47 +00001479 case ASTContext::GE_None:
Douglas Gregor370ab3f2009-02-14 01:52:53 +00001480 // Okay
1481 break;
1482
Mike Stumpf711c412009-07-28 23:57:15 +00001483 case ASTContext::GE_Missing_stdio:
Douglas Gregor370ab3f2009-02-14 01:52:53 +00001484 if (ForRedeclaration)
Douglas Gregor6b9109e2011-01-03 09:37:44 +00001485 Diag(Loc, diag::warn_implicit_decl_requires_stdio)
Douglas Gregor370ab3f2009-02-14 01:52:53 +00001486 << Context.BuiltinInfo.GetName(BID);
1487 return 0;
Mike Stump782fa302009-07-28 02:25:19 +00001488
Mike Stumpf711c412009-07-28 23:57:15 +00001489 case ASTContext::GE_Missing_setjmp:
Mike Stump782fa302009-07-28 02:25:19 +00001490 if (ForRedeclaration)
Douglas Gregor6b9109e2011-01-03 09:37:44 +00001491 Diag(Loc, diag::warn_implicit_decl_requires_setjmp)
Mike Stump782fa302009-07-28 02:25:19 +00001492 << Context.BuiltinInfo.GetName(BID);
1493 return 0;
Rafael Espindolae2d4f4e2011-11-13 21:51:09 +00001494
1495 case ASTContext::GE_Missing_ucontext:
1496 if (ForRedeclaration)
1497 Diag(Loc, diag::warn_implicit_decl_requires_ucontext)
1498 << Context.BuiltinInfo.GetName(BID);
1499 return 0;
Douglas Gregor370ab3f2009-02-14 01:52:53 +00001500 }
Douglas Gregor3e41d602009-02-13 23:20:09 +00001501
1502 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) {
1503 Diag(Loc, diag::ext_implicit_lib_function_decl)
1504 << Context.BuiltinInfo.GetName(BID)
1505 << R;
Douglas Gregorb1152d82009-02-16 21:58:21 +00001506 if (Context.BuiltinInfo.getHeaderName(BID) &&
Argyrios Kyrtzidis08274082010-12-15 18:44:22 +00001507 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc)
David Blaikied6471f72011-09-25 23:23:43 +00001508 != DiagnosticsEngine::Ignored)
Douglas Gregor3e41d602009-02-13 23:20:09 +00001509 Diag(Loc, diag::note_please_include_header)
1510 << Context.BuiltinInfo.getHeaderName(BID)
1511 << Context.BuiltinInfo.GetName(BID);
1512 }
1513
Argyrios Kyrtzidisff898cd2008-04-17 14:47:13 +00001514 FunctionDecl *New = FunctionDecl::Create(Context,
1515 Context.getTranslationUnitDecl(),
Abramo Bagnaraff676cb2011-03-08 08:55:46 +00001516 Loc, Loc, II, R, /*TInfo=*/0,
John McCalld931b082010-08-26 03:08:43 +00001517 SC_Extern,
1518 SC_None, false,
Douglas Gregor2224f842009-02-25 16:33:18 +00001519 /*hasPrototype=*/true);
Douglas Gregor3e41d602009-02-13 23:20:09 +00001520 New->setImplicit();
1521
Chris Lattner95e2c712008-05-05 22:18:14 +00001522 // Create Decl objects for each parameter, adding them to the
1523 // FunctionDecl.
John McCallf4c73712011-01-19 06:33:43 +00001524 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) {
Chris Lattner5f9e2722011-07-23 10:55:15 +00001525 SmallVector<ParmVarDecl*, 16> Params;
John McCallfb44de92011-05-01 22:35:37 +00001526 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) {
1527 ParmVarDecl *parm =
1528 ParmVarDecl::Create(Context, New, SourceLocation(),
1529 SourceLocation(), 0,
1530 FT->getArgType(i), /*TInfo=*/0,
1531 SC_None, SC_None, 0);
1532 parm->setScopeInfo(0, i);
1533 Params.push_back(parm);
1534 }
David Blaikie4278c652011-09-21 18:16:56 +00001535 New->setParams(Params);
Chris Lattner95e2c712008-05-05 22:18:14 +00001536 }
Mike Stump1eb44332009-09-09 15:08:12 +00001537
1538 AddKnownFunctionAttributes(New);
1539
Chris Lattner7f925cc2008-04-11 07:00:53 +00001540 // TUScope is the translation-unit scope to insert this function into.
Douglas Gregora8cc8ce2009-01-09 18:51:29 +00001541 // FIXME: This is hideous. We need to teach PushOnScopeChains to
1542 // relate Scopes to DeclContexts, and probably eliminate CurContext
1543 // entirely, but we're not there yet.
1544 DeclContext *SavedContext = CurContext;
1545 CurContext = Context.getTranslationUnitDecl();
Argyrios Kyrtzidis00bc6452008-05-09 23:39:43 +00001546 PushOnScopeChains(New, TUScope);
Douglas Gregora8cc8ce2009-01-09 18:51:29 +00001547 CurContext = SavedContext;
Reid Spencer5f016e22007-07-11 17:01:13 +00001548 return New;
1549}
1550
Rafael Espindola5df37bd2011-12-26 22:42:47 +00001551bool Sema::isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New) {
1552 QualType OldType;
1553 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old))
1554 OldType = OldTypedef->getUnderlyingType();
1555 else
1556 OldType = Context.getTypeDeclType(Old);
1557 QualType NewType = New->getUnderlyingType();
1558
Douglas Gregorec3bd722012-01-11 22:33:48 +00001559 if (NewType->isVariablyModifiedType()) {
1560 // Must not redefine a typedef with a variably-modified type.
1561 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0;
1562 Diag(New->getLocation(), diag::err_redefinition_variably_modified_typedef)
1563 << Kind << NewType;
1564 if (Old->getLocation().isValid())
1565 Diag(Old->getLocation(), diag::note_previous_definition);
1566 New->setInvalidDecl();
1567 return true;
1568 }
1569
Rafael Espindola5df37bd2011-12-26 22:42:47 +00001570 if (OldType != NewType &&
1571 !OldType->isDependentType() &&
1572 !NewType->isDependentType() &&
Douglas Gregorec3bd722012-01-11 22:33:48 +00001573 !Context.hasSameType(OldType, NewType)) {
Rafael Espindola5df37bd2011-12-26 22:42:47 +00001574 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0;
1575 Diag(New->getLocation(), diag::err_redefinition_different_typedef)
1576 << Kind << NewType << OldType;
1577 if (Old->getLocation().isValid())
1578 Diag(Old->getLocation(), diag::note_previous_definition);
1579 New->setInvalidDecl();
1580 return true;
1581 }
1582 return false;
1583}
1584
Richard Smith162e1c12011-04-15 14:24:37 +00001585/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the
Douglas Gregorcda9c672009-02-16 17:45:42 +00001586/// same name and scope as a previous declaration 'Old'. Figure out
1587/// how to resolve this situation, merging decls or emitting
Chris Lattnereaaebc72009-04-25 08:06:05 +00001588/// diagnostics as appropriate. If there was an error, set New to be invalid.
Reid Spencer5f016e22007-07-11 17:01:13 +00001589///
Richard Smith162e1c12011-04-15 14:24:37 +00001590void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) {
John McCall68263142009-11-18 22:49:29 +00001591 // If the new decl is known invalid already, don't bother doing any
1592 // merging checks.
1593 if (New->isInvalidDecl()) return;
Mike Stump1eb44332009-09-09 15:08:12 +00001594
Steve Naroff2b255c42008-09-09 14:32:20 +00001595 // Allow multiple definitions for ObjC built-in typedefs.
1596 // FIXME: Verify the underlying types are equivalent!
David Blaikie4e4d0842012-03-11 07:00:24 +00001597 if (getLangOpts().ObjC1) {
Chris Lattner2bac0f62008-11-20 05:41:43 +00001598 const IdentifierInfo *TypeID = New->getIdentifier();
1599 switch (TypeID->getLength()) {
1600 default: break;
Mike Stump1eb44332009-09-09 15:08:12 +00001601 case 2:
Fariborz Jahanian0cd00be2012-05-14 22:48:56 +00001602 {
1603 if (!TypeID->isStr("id"))
1604 break;
1605 QualType T = New->getUnderlyingType();
1606 if (!T->isPointerType())
1607 break;
1608 if (!T->isVoidPointerType()) {
1609 QualType PT = T->getAs<PointerType>()->getPointeeType();
1610 if (!PT->isStructureType())
1611 break;
1612 }
1613 Context.setObjCIdRedefinitionType(T);
1614 // Install the built-in type for 'id', ignoring the current definition.
1615 New->setTypeForDecl(Context.getObjCIdType().getTypePtr());
1616 return;
1617 }
Chris Lattner2bac0f62008-11-20 05:41:43 +00001618 case 5:
1619 if (!TypeID->isStr("Class"))
1620 break;
Douglas Gregor01a4cf12011-08-11 20:58:55 +00001621 Context.setObjCClassRedefinitionType(New->getUnderlyingType());
Steve Naroff14108da2009-07-10 23:34:53 +00001622 // Install the built-in type for 'Class', ignoring the current definition.
1623 New->setTypeForDecl(Context.getObjCClassType().getTypePtr());
Chris Lattnereaaebc72009-04-25 08:06:05 +00001624 return;
Chris Lattner2bac0f62008-11-20 05:41:43 +00001625 case 3:
1626 if (!TypeID->isStr("SEL"))
1627 break;
Douglas Gregor01a4cf12011-08-11 20:58:55 +00001628 Context.setObjCSelRedefinitionType(New->getUnderlyingType());
Fariborz Jahanian13dcd002009-11-21 19:53:08 +00001629 // Install the built-in type for 'SEL', ignoring the current definition.
1630 New->setTypeForDecl(Context.getObjCSelType().getTypePtr());
Chris Lattnereaaebc72009-04-25 08:06:05 +00001631 return;
Steve Naroff2b255c42008-09-09 14:32:20 +00001632 }
1633 // Fall through - the typedef name was not a builtin type.
1634 }
John McCall68263142009-11-18 22:49:29 +00001635
Douglas Gregor66973122009-01-28 17:15:10 +00001636 // Verify the old decl was also a type.
John McCall5126fd02009-12-30 00:31:22 +00001637 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>();
1638 if (!Old) {
Mike Stump1eb44332009-09-09 15:08:12 +00001639 Diag(New->getLocation(), diag::err_redefinition_different_kind)
Chris Lattner08631c52008-11-23 21:45:46 +00001640 << New->getDeclName();
John McCall68263142009-11-18 22:49:29 +00001641
1642 NamedDecl *OldD = OldDecls.getRepresentativeDecl();
Chris Lattnereaaebc72009-04-25 08:06:05 +00001643 if (OldD->getLocation().isValid())
Fariborz Jahanianc55a2402009-01-16 19:58:32 +00001644 Diag(OldD->getLocation(), diag::note_previous_definition);
John McCall68263142009-11-18 22:49:29 +00001645
Chris Lattnereaaebc72009-04-25 08:06:05 +00001646 return New->setInvalidDecl();
Reid Spencer5f016e22007-07-11 17:01:13 +00001647 }
Douglas Gregor66973122009-01-28 17:15:10 +00001648
John McCall68263142009-11-18 22:49:29 +00001649 // If the old declaration is invalid, just give up here.
1650 if (Old->isInvalidDecl())
1651 return New->setInvalidDecl();
1652
Chris Lattner99cb9972008-07-25 18:44:27 +00001653 // If the typedef types are not identical, reject them in all languages and
1654 // with any extensions enabled.
Rafael Espindola5df37bd2011-12-26 22:42:47 +00001655 if (isIncompatibleTypedef(Old, New))
1656 return;
Mike Stump1eb44332009-09-09 15:08:12 +00001657
John McCall5126fd02009-12-30 00:31:22 +00001658 // The types match. Link up the redeclaration chain if the old
1659 // declaration was a typedef.
Richard Smith162e1c12011-04-15 14:24:37 +00001660 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old))
1661 New->setPreviousDeclaration(Typedef);
John McCall5126fd02009-12-30 00:31:22 +00001662
David Blaikie4e4d0842012-03-11 07:00:24 +00001663 if (getLangOpts().MicrosoftExt)
Chris Lattnereaaebc72009-04-25 08:06:05 +00001664 return;
Eli Friedman54ecfce2008-06-11 06:20:39 +00001665
David Blaikie4e4d0842012-03-11 07:00:24 +00001666 if (getLangOpts().CPlusPlus) {
Douglas Gregor93dda722010-01-11 21:54:40 +00001667 // C++ [dcl.typedef]p2:
1668 // In a given non-class scope, a typedef specifier can be used to
1669 // redefine the name of any type declared in that scope to refer
1670 // to the type to which it already refers.
Chris Lattner32b06752009-04-17 22:04:20 +00001671 if (!isa<CXXRecordDecl>(CurContext))
Chris Lattnereaaebc72009-04-25 08:06:05 +00001672 return;
Douglas Gregor93dda722010-01-11 21:54:40 +00001673
1674 // C++0x [dcl.typedef]p4:
1675 // In a given class scope, a typedef specifier can be used to redefine
1676 // any class-name declared in that scope that is not also a typedef-name
1677 // to refer to the type to which it already refers.
1678 //
1679 // This wording came in via DR424, which was a correction to the
1680 // wording in DR56, which accidentally banned code like:
1681 //
1682 // struct S {
1683 // typedef struct A { } A;
1684 // };
1685 //
1686 // in the C++03 standard. We implement the C++0x semantics, which
1687 // allow the above but disallow
1688 //
1689 // struct S {
1690 // typedef int I;
1691 // typedef int I;
1692 // };
1693 //
1694 // since that was the intent of DR56.
Richard Smith162e1c12011-04-15 14:24:37 +00001695 if (!isa<TypedefNameDecl>(Old))
Douglas Gregor93dda722010-01-11 21:54:40 +00001696 return;
1697
Chris Lattner32b06752009-04-17 22:04:20 +00001698 Diag(New->getLocation(), diag::err_redefinition)
1699 << New->getDeclName();
1700 Diag(Old->getLocation(), diag::note_previous_definition);
Chris Lattnereaaebc72009-04-25 08:06:05 +00001701 return New->setInvalidDecl();
Daniel Dunbar2fe09972008-09-12 18:10:20 +00001702 }
Eli Friedman54ecfce2008-06-11 06:20:39 +00001703
Douglas Gregorc0004df2012-01-11 04:25:01 +00001704 // Modules always permit redefinition of typedefs, as does C11.
David Blaikie4e4d0842012-03-11 07:00:24 +00001705 if (getLangOpts().Modules || getLangOpts().C11)
Douglas Gregorc02d62f2012-01-09 15:36:04 +00001706 return;
1707
Chris Lattner32b06752009-04-17 22:04:20 +00001708 // If we have a redefinition of a typedef in C, emit a warning. This warning
1709 // is normally mapped to an error, but can be controlled with
Eli Friedman340a4e52009-06-04 23:03:07 +00001710 // -Wtypedef-redefinition. If either the original or the redefinition is
1711 // in a system header, don't emit this for compatibility with GCC.
Chris Lattner6d97e5e2010-03-01 20:59:53 +00001712 if (getDiagnostics().getSuppressSystemWarnings() &&
Eli Friedman340a4e52009-06-04 23:03:07 +00001713 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) ||
1714 Context.getSourceManager().isInSystemHeader(New->getLocation())))
Chris Lattnerd0359af2009-04-27 01:46:12 +00001715 return;
Mike Stump1eb44332009-09-09 15:08:12 +00001716
Chris Lattner32b06752009-04-17 22:04:20 +00001717 Diag(New->getLocation(), diag::warn_redefinition_of_typedef)
1718 << New->getDeclName();
Chris Lattner5f4a6822008-11-23 23:12:31 +00001719 Diag(Old->getLocation(), diag::note_previous_definition);
Chris Lattnereaaebc72009-04-25 08:06:05 +00001720 return;
Reid Spencer5f016e22007-07-11 17:01:13 +00001721}
1722
Chris Lattner6b6b5372008-06-26 18:38:35 +00001723/// DeclhasAttr - returns true if decl Declaration already has the target
1724/// attribute.
Mike Stump1eb44332009-09-09 15:08:12 +00001725static bool
Sean Huntcf807c42010-08-18 23:23:40 +00001726DeclHasAttr(const Decl *D, const Attr *A) {
Rafael Espindola3b294362012-05-06 19:56:25 +00001727 // There can be multiple AvailabilityAttr in a Decl. Make sure we copy
1728 // all of them. It is mergeAvailabilityAttr in SemaDeclAttr.cpp that is
1729 // responsible for making sure they are consistent.
1730 const AvailabilityAttr *AA = dyn_cast<AvailabilityAttr>(A);
1731 if (AA)
1732 return false;
1733
DeLesley Hutchins3ce9fae2012-10-12 21:38:12 +00001734 // The following thread safety attributes can also be duplicated.
1735 switch (A->getKind()) {
1736 case attr::ExclusiveLocksRequired:
1737 case attr::SharedLocksRequired:
1738 case attr::LocksExcluded:
1739 case attr::ExclusiveLockFunction:
1740 case attr::SharedLockFunction:
1741 case attr::UnlockFunction:
1742 case attr::ExclusiveTrylockFunction:
1743 case attr::SharedTrylockFunction:
1744 case attr::GuardedBy:
1745 case attr::PtGuardedBy:
1746 case attr::AcquiredBefore:
1747 case attr::AcquiredAfter:
1748 return false;
DeLesley Hutchins6c500b12012-10-12 21:49:04 +00001749 default:
1750 ;
DeLesley Hutchins3ce9fae2012-10-12 21:38:12 +00001751 }
1752
Sean Huntcf807c42010-08-18 23:23:40 +00001753 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A);
Julien Lerouge77f68bb2011-09-09 22:41:49 +00001754 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A);
Sean Huntcf807c42010-08-18 23:23:40 +00001755 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i)
1756 if ((*i)->getKind() == A->getKind()) {
Julien Lerouge77f68bb2011-09-09 22:41:49 +00001757 if (Ann) {
1758 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation())
1759 return true;
1760 continue;
1761 }
Sean Huntcf807c42010-08-18 23:23:40 +00001762 // FIXME: Don't hardcode this check
1763 if (OA && isa<OwnershipAttr>(*i))
1764 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind();
Chris Lattnerddee4232008-03-03 03:28:21 +00001765 return true;
Sean Huntcf807c42010-08-18 23:23:40 +00001766 }
Chris Lattnerddee4232008-03-03 03:28:21 +00001767
1768 return false;
1769}
1770
Rafael Espindola98ae8342012-05-10 02:50:16 +00001771bool Sema::mergeDeclAttribute(Decl *D, InheritableAttr *Attr) {
Rafael Espindola599f1b72012-05-13 03:25:18 +00001772 InheritableAttr *NewAttr = NULL;
Rafael Espindola98ae8342012-05-10 02:50:16 +00001773 if (AvailabilityAttr *AA = dyn_cast<AvailabilityAttr>(Attr))
Rafael Espindola599f1b72012-05-13 03:25:18 +00001774 NewAttr = mergeAvailabilityAttr(D, AA->getRange(), AA->getPlatform(),
1775 AA->getIntroduced(), AA->getDeprecated(),
1776 AA->getObsoleted(), AA->getUnavailable(),
1777 AA->getMessage());
Rafael Espindoladfb31662012-12-25 00:39:58 +00001778 else if (VisibilityAttr *VA = dyn_cast<VisibilityAttr>(Attr)) {
Rafael Espindola599f1b72012-05-13 03:25:18 +00001779 NewAttr = mergeVisibilityAttr(D, VA->getRange(), VA->getVisibility());
Rafael Espindoladfb31662012-12-25 00:39:58 +00001780 if (NewAttr) {
1781 NamedDecl *ND = cast<NamedDecl>(D);
1782 ND->ClearLVCache();
1783 }
1784 } else if (DLLImportAttr *ImportA = dyn_cast<DLLImportAttr>(Attr))
Rafael Espindola599f1b72012-05-13 03:25:18 +00001785 NewAttr = mergeDLLImportAttr(D, ImportA->getRange());
1786 else if (DLLExportAttr *ExportA = dyn_cast<DLLExportAttr>(Attr))
1787 NewAttr = mergeDLLExportAttr(D, ExportA->getRange());
1788 else if (FormatAttr *FA = dyn_cast<FormatAttr>(Attr))
1789 NewAttr = mergeFormatAttr(D, FA->getRange(), FA->getType(),
1790 FA->getFormatIdx(), FA->getFirstArg());
1791 else if (SectionAttr *SA = dyn_cast<SectionAttr>(Attr))
1792 NewAttr = mergeSectionAttr(D, SA->getRange(), SA->getName());
1793 else if (!DeclHasAttr(D, Attr))
1794 NewAttr = cast<InheritableAttr>(Attr->clone(Context));
Rafael Espindola98ae8342012-05-10 02:50:16 +00001795
Rafael Espindola599f1b72012-05-13 03:25:18 +00001796 if (NewAttr) {
Rafael Espindola98ae8342012-05-10 02:50:16 +00001797 NewAttr->setInherited(true);
1798 D->addAttr(NewAttr);
1799 return true;
1800 }
1801
1802 return false;
1803}
1804
Rafael Espindola4b044c62012-07-15 01:05:36 +00001805static const Decl *getDefinition(const Decl *D) {
1806 if (const TagDecl *TD = dyn_cast<TagDecl>(D))
Rafael Espindola3f664062012-05-18 01:47:00 +00001807 return TD->getDefinition();
Rafael Espindola4b044c62012-07-15 01:05:36 +00001808 if (const VarDecl *VD = dyn_cast<VarDecl>(D))
Rafael Espindola3f664062012-05-18 01:47:00 +00001809 return VD->getDefinition();
Rafael Espindola4b044c62012-07-15 01:05:36 +00001810 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
Rafael Espindola3f664062012-05-18 01:47:00 +00001811 const FunctionDecl* Def;
1812 if (FD->hasBody(Def))
1813 return Def;
1814 }
1815 return NULL;
1816}
1817
Rafael Espindolad320ffc2012-07-15 01:33:40 +00001818static bool hasAttribute(const Decl *D, attr::Kind Kind) {
1819 for (Decl::attr_iterator I = D->attr_begin(), E = D->attr_end();
1820 I != E; ++I) {
1821 Attr *Attribute = *I;
1822 if (Attribute->getKind() == Kind)
1823 return true;
1824 }
1825 return false;
1826}
1827
1828/// checkNewAttributesAfterDef - If we already have a definition, check that
1829/// there are no new attributes in this declaration.
1830static void checkNewAttributesAfterDef(Sema &S, Decl *New, const Decl *Old) {
1831 if (!New->hasAttrs())
1832 return;
1833
1834 const Decl *Def = getDefinition(Old);
1835 if (!Def || Def == New)
1836 return;
1837
1838 AttrVec &NewAttributes = New->getAttrs();
1839 for (unsigned I = 0, E = NewAttributes.size(); I != E;) {
1840 const Attr *NewAttribute = NewAttributes[I];
1841 if (hasAttribute(Def, NewAttribute->getKind())) {
1842 ++I;
1843 continue; // regular attr merging will take care of validating this.
1844 }
1845 S.Diag(NewAttribute->getLocation(),
1846 diag::warn_attribute_precede_definition);
1847 S.Diag(Def->getLocation(), diag::note_previous_definition);
1848 NewAttributes.erase(NewAttributes.begin() + I);
1849 --E;
1850 }
1851}
1852
John McCalleca5d222011-03-02 04:00:57 +00001853/// mergeDeclAttributes - Copy attributes from the Old decl to the New one.
Douglas Gregor27c6da22012-01-01 20:30:41 +00001854void Sema::mergeDeclAttributes(Decl *New, Decl *Old,
1855 bool MergeDeprecation) {
Rafael Espindola3f664062012-05-18 01:47:00 +00001856 // attributes declared post-definition are currently ignored
Rafael Espindolad320ffc2012-07-15 01:33:40 +00001857 checkNewAttributesAfterDef(*this, New, Old);
Rafael Espindola3f664062012-05-18 01:47:00 +00001858
Douglas Gregor27c6da22012-01-01 20:30:41 +00001859 if (!Old->hasAttrs())
Sean Huntcf807c42010-08-18 23:23:40 +00001860 return;
John McCalleca5d222011-03-02 04:00:57 +00001861
Douglas Gregor27c6da22012-01-01 20:30:41 +00001862 bool foundAny = New->hasAttrs();
John McCalleca5d222011-03-02 04:00:57 +00001863
Sean Huntcf807c42010-08-18 23:23:40 +00001864 // Ensure that any moving of objects within the allocated map is done before
1865 // we process them.
Douglas Gregor27c6da22012-01-01 20:30:41 +00001866 if (!foundAny) New->setAttrs(AttrVec());
John McCalleca5d222011-03-02 04:00:57 +00001867
Peter Collingbournea97d70b2011-01-21 02:08:36 +00001868 for (specific_attr_iterator<InheritableAttr>
Douglas Gregor27c6da22012-01-01 20:30:41 +00001869 i = Old->specific_attr_begin<InheritableAttr>(),
1870 e = Old->specific_attr_end<InheritableAttr>();
1871 i != e; ++i) {
Douglas Gregorc193dd82011-09-23 20:23:42 +00001872 // Ignore deprecated/unavailable/availability attributes if requested.
Douglas Gregor27c6da22012-01-01 20:30:41 +00001873 if (!MergeDeprecation &&
Douglas Gregorc193dd82011-09-23 20:23:42 +00001874 (isa<DeprecatedAttr>(*i) ||
1875 isa<UnavailableAttr>(*i) ||
1876 isa<AvailabilityAttr>(*i)))
John McCall6c2c2502011-07-22 02:45:48 +00001877 continue;
1878
Rafael Espindola98ae8342012-05-10 02:50:16 +00001879 if (mergeDeclAttribute(New, *i))
John McCalleca5d222011-03-02 04:00:57 +00001880 foundAny = true;
Chris Lattnerddee4232008-03-03 03:28:21 +00001881 }
John McCalleca5d222011-03-02 04:00:57 +00001882
Douglas Gregor27c6da22012-01-01 20:30:41 +00001883 if (!foundAny) New->dropAttrs();
John McCalleca5d222011-03-02 04:00:57 +00001884}
1885
1886/// mergeParamDeclAttributes - Copy attributes from the old parameter
1887/// to the new one.
1888static void mergeParamDeclAttributes(ParmVarDecl *newDecl,
1889 const ParmVarDecl *oldDecl,
1890 ASTContext &C) {
1891 if (!oldDecl->hasAttrs())
1892 return;
1893
1894 bool foundAny = newDecl->hasAttrs();
1895
1896 // Ensure that any moving of objects within the allocated map is
1897 // done before we process them.
1898 if (!foundAny) newDecl->setAttrs(AttrVec());
1899
1900 for (specific_attr_iterator<InheritableParamAttr>
1901 i = oldDecl->specific_attr_begin<InheritableParamAttr>(),
1902 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) {
1903 if (!DeclHasAttr(newDecl, *i)) {
1904 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C));
1905 newAttr->setInherited(true);
1906 newDecl->addAttr(newAttr);
1907 foundAny = true;
1908 }
1909 }
1910
1911 if (!foundAny) newDecl->dropAttrs();
Chris Lattnerddee4232008-03-03 03:28:21 +00001912}
1913
Dan Gohman3c46e8d2010-07-26 21:25:24 +00001914namespace {
1915
Douglas Gregorc8376562009-03-06 22:43:54 +00001916/// Used in MergeFunctionDecl to keep track of function parameters in
1917/// C.
1918struct GNUCompatibleParamWarning {
1919 ParmVarDecl *OldParm;
1920 ParmVarDecl *NewParm;
1921 QualType PromotedType;
1922};
1923
Dan Gohman3c46e8d2010-07-26 21:25:24 +00001924}
Anders Carlsson5c478cf2009-12-04 22:33:25 +00001925
1926/// getSpecialMember - get the special member enum for a method.
Anders Carlsson3b8c53b2010-04-22 05:40:53 +00001927Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) {
Anders Carlsson5c478cf2009-12-04 22:33:25 +00001928 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) {
Sean Huntf961ea52011-05-10 19:08:14 +00001929 if (Ctor->isDefaultConstructor())
1930 return Sema::CXXDefaultConstructor;
Sean Hunt9ae60d52011-05-26 01:26:05 +00001931
1932 if (Ctor->isCopyConstructor())
1933 return Sema::CXXCopyConstructor;
1934
1935 if (Ctor->isMoveConstructor())
1936 return Sema::CXXMoveConstructor;
Sean Hunt82713172011-05-25 23:16:36 +00001937 } else if (isa<CXXDestructorDecl>(MD)) {
Anders Carlsson5c478cf2009-12-04 22:33:25 +00001938 return Sema::CXXDestructor;
Sean Hunt82713172011-05-25 23:16:36 +00001939 } else if (MD->isCopyAssignmentOperator()) {
Sean Huntf961ea52011-05-10 19:08:14 +00001940 return Sema::CXXCopyAssignment;
Sebastian Redl74e611a2011-09-04 18:14:28 +00001941 } else if (MD->isMoveAssignmentOperator()) {
1942 return Sema::CXXMoveAssignment;
Sean Hunt82713172011-05-25 23:16:36 +00001943 }
Sean Huntf961ea52011-05-10 19:08:14 +00001944
Sean Huntf961ea52011-05-10 19:08:14 +00001945 return Sema::CXXInvalid;
Anders Carlsson5c478cf2009-12-04 22:33:25 +00001946}
1947
Sebastian Redl515ddd82010-06-09 21:17:41 +00001948/// canRedefineFunction - checks if a function can be redefined. Currently,
Charles Davisf3f8d2a2010-02-18 02:00:42 +00001949/// only extern inline functions can be redefined, and even then only in
1950/// GNU89 mode.
1951static bool canRedefineFunction(const FunctionDecl *FD,
1952 const LangOptions& LangOpts) {
Eli Friedmaneca3ed72011-06-13 23:56:42 +00001953 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) &&
1954 !LangOpts.CPlusPlus &&
Charles Davisf3f8d2a2010-02-18 02:00:42 +00001955 FD->isInlineSpecified() &&
John McCalld931b082010-08-26 03:08:43 +00001956 FD->getStorageClass() == SC_Extern);
Charles Davisf3f8d2a2010-02-18 02:00:42 +00001957}
1958
John McCallfb609142012-08-25 02:00:03 +00001959/// Is the given calling convention the ABI default for the given
1960/// declaration?
1961static bool isABIDefaultCC(Sema &S, CallingConv CC, FunctionDecl *D) {
1962 CallingConv ABIDefaultCC;
1963 if (isa<CXXMethodDecl>(D) && cast<CXXMethodDecl>(D)->isInstance()) {
1964 ABIDefaultCC = S.Context.getDefaultCXXMethodCallConv(D->isVariadic());
1965 } else {
1966 // Free C function or a static method.
1967 ABIDefaultCC = (S.Context.getLangOpts().MRTD ? CC_X86StdCall : CC_C);
1968 }
1969 return ABIDefaultCC == CC;
1970}
1971
Chris Lattner04421082008-04-08 04:40:51 +00001972/// MergeFunctionDecl - We just parsed a function 'New' from
1973/// declarator D which has the same name and scope as a previous
1974/// declaration 'Old'. Figure out how to resolve this situation,
1975/// merging decls or emitting diagnostics as appropriate.
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00001976///
1977/// In C++, New and Old must be declarations that are not
1978/// overloaded. Use IsOverload to determine whether New and Old are
1979/// overloaded, and to select the Old declaration that New should be
1980/// merged with.
Douglas Gregorcda9c672009-02-16 17:45:42 +00001981///
1982/// Returns true if there was an error, false otherwise.
James Molloy9cda03f2012-03-13 08:55:35 +00001983bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD, Scope *S) {
Reid Spencer5f016e22007-07-11 17:01:13 +00001984 // Verify the old decl was also a function.
Douglas Gregore53060f2009-06-25 22:08:12 +00001985 FunctionDecl *Old = 0;
Mike Stump1eb44332009-09-09 15:08:12 +00001986 if (FunctionTemplateDecl *OldFunctionTemplate
Douglas Gregore53060f2009-06-25 22:08:12 +00001987 = dyn_cast<FunctionTemplateDecl>(OldD))
1988 Old = OldFunctionTemplate->getTemplatedDecl();
Mike Stump1eb44332009-09-09 15:08:12 +00001989 else
Douglas Gregore53060f2009-06-25 22:08:12 +00001990 Old = dyn_cast<FunctionDecl>(OldD);
Reid Spencer5f016e22007-07-11 17:01:13 +00001991 if (!Old) {
John McCall41ce66f2009-12-10 19:51:03 +00001992 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) {
1993 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse);
1994 Diag(Shadow->getTargetDecl()->getLocation(),
1995 diag::note_using_decl_target);
1996 Diag(Shadow->getUsingDecl()->getLocation(),
1997 diag::note_using_decl) << 0;
1998 return true;
1999 }
2000
Chris Lattner5dc266a2008-11-20 06:13:02 +00002001 Diag(New->getLocation(), diag::err_redefinition_different_kind)
Chris Lattner08631c52008-11-23 21:45:46 +00002002 << New->getDeclName();
Chris Lattner5f4a6822008-11-23 23:12:31 +00002003 Diag(OldD->getLocation(), diag::note_previous_definition);
Douglas Gregorcda9c672009-02-16 17:45:42 +00002004 return true;
Reid Spencer5f016e22007-07-11 17:01:13 +00002005 }
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00002006
2007 // Determine whether the previous declaration was a definition,
2008 // implicit declaration, or a declaration.
2009 diag::kind PrevDiag;
2010 if (Old->isThisDeclarationADefinition())
Chris Lattner5f4a6822008-11-23 23:12:31 +00002011 PrevDiag = diag::note_previous_definition;
Douglas Gregorcda9c672009-02-16 17:45:42 +00002012 else if (Old->isImplicit())
2013 PrevDiag = diag::note_previous_implicit_declaration;
Mike Stump1eb44332009-09-09 15:08:12 +00002014 else
Chris Lattner5f4a6822008-11-23 23:12:31 +00002015 PrevDiag = diag::note_previous_declaration;
Mike Stump1eb44332009-09-09 15:08:12 +00002016
Chris Lattner8bcfc5b2008-04-06 23:10:54 +00002017 QualType OldQType = Context.getCanonicalType(Old->getType());
2018 QualType NewQType = Context.getCanonicalType(New->getType());
Mike Stump1eb44332009-09-09 15:08:12 +00002019
Charles Davisf3f8d2a2010-02-18 02:00:42 +00002020 // Don't complain about this if we're in GNU89 mode and the old function
2021 // is an extern inline function.
Douglas Gregor04495c82009-02-24 01:23:02 +00002022 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) &&
John McCalld931b082010-08-26 03:08:43 +00002023 New->getStorageClass() == SC_Static &&
2024 Old->getStorageClass() != SC_Static &&
David Blaikie4e4d0842012-03-11 07:00:24 +00002025 !canRedefineFunction(Old, getLangOpts())) {
2026 if (getLangOpts().MicrosoftExt) {
Francois Pichet4bada2e2011-04-22 19:50:06 +00002027 Diag(New->getLocation(), diag::warn_static_non_static) << New;
2028 Diag(Old->getLocation(), PrevDiag);
2029 } else {
2030 Diag(New->getLocation(), diag::err_static_non_static) << New;
2031 Diag(Old->getLocation(), PrevDiag);
2032 return true;
2033 }
Douglas Gregor04495c82009-02-24 01:23:02 +00002034 }
2035
John McCallf82b4e82010-02-04 05:44:44 +00002036 // If a function is first declared with a calling convention, but is
2037 // later declared or defined without one, the second decl assumes the
2038 // calling convention of the first.
2039 //
John McCallfb609142012-08-25 02:00:03 +00002040 // It's OK if a function is first declared without a calling convention,
2041 // but is later declared or defined with the default calling convention.
2042 //
John McCallf82b4e82010-02-04 05:44:44 +00002043 // For the new decl, we have to look at the NON-canonical type to tell the
2044 // difference between a function that really doesn't have a calling
2045 // convention and one that is declared cdecl. That's because in
2046 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away
2047 // because it is the default calling convention.
2048 //
2049 // Note also that we DO NOT return at this point, because we still have
2050 // other tests to run.
John McCalle6a365d2010-12-19 02:44:49 +00002051 const FunctionType *OldType = cast<FunctionType>(OldQType);
John McCallf82b4e82010-02-04 05:44:44 +00002052 const FunctionType *NewType = New->getType()->getAs<FunctionType>();
John McCalle6a365d2010-12-19 02:44:49 +00002053 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo();
2054 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo();
2055 bool RequiresAdjustment = false;
John McCallfb609142012-08-25 02:00:03 +00002056 if (OldTypeInfo.getCC() == NewTypeInfo.getCC()) {
2057 // Fast path: nothing to do.
2058
2059 // Inherit the CC from the previous declaration if it was specified
2060 // there but not here.
2061 } else if (NewTypeInfo.getCC() == CC_Default) {
John McCalle6a365d2010-12-19 02:44:49 +00002062 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC());
2063 RequiresAdjustment = true;
John McCallfb609142012-08-25 02:00:03 +00002064
2065 // Don't complain about mismatches when the default CC is
2066 // effectively the same as the explict one.
2067 } else if (OldTypeInfo.getCC() == CC_Default &&
2068 isABIDefaultCC(*this, NewTypeInfo.getCC(), New)) {
2069 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC());
2070 RequiresAdjustment = true;
2071
Rafael Espindola264ba482010-03-30 20:24:48 +00002072 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(),
2073 NewTypeInfo.getCC())) {
John McCallf82b4e82010-02-04 05:44:44 +00002074 // Calling conventions really aren't compatible, so complain.
John McCall04a67a62010-02-05 21:31:56 +00002075 Diag(New->getLocation(), diag::err_cconv_change)
Rafael Espindola264ba482010-03-30 20:24:48 +00002076 << FunctionType::getNameForCallConv(NewTypeInfo.getCC())
2077 << (OldTypeInfo.getCC() == CC_Default)
2078 << (OldTypeInfo.getCC() == CC_Default ? "" :
2079 FunctionType::getNameForCallConv(OldTypeInfo.getCC()));
John McCall04a67a62010-02-05 21:31:56 +00002080 Diag(Old->getLocation(), diag::note_previous_declaration);
John McCallf82b4e82010-02-04 05:44:44 +00002081 return true;
2082 }
2083
John McCall04a67a62010-02-05 21:31:56 +00002084 // FIXME: diagnose the other way around?
John McCalle6a365d2010-12-19 02:44:49 +00002085 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) {
2086 NewTypeInfo = NewTypeInfo.withNoReturn(true);
2087 RequiresAdjustment = true;
John McCall04a67a62010-02-05 21:31:56 +00002088 }
2089
Douglas Gregord2c64902010-06-18 21:30:25 +00002090 // Merge regparm attribute.
Eli Friedmana49218e2011-04-09 08:18:08 +00002091 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() ||
2092 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) {
2093 if (NewTypeInfo.getHasRegParm()) {
Douglas Gregord2c64902010-06-18 21:30:25 +00002094 Diag(New->getLocation(), diag::err_regparm_mismatch)
2095 << NewType->getRegParmType()
2096 << OldType->getRegParmType();
2097 Diag(Old->getLocation(), diag::note_previous_declaration);
2098 return true;
2099 }
John McCalle6a365d2010-12-19 02:44:49 +00002100
2101 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm());
2102 RequiresAdjustment = true;
2103 }
2104
Douglas Gregorcb1c9c32011-10-14 15:55:40 +00002105 // Merge ns_returns_retained attribute.
2106 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) {
2107 if (NewTypeInfo.getProducesResult()) {
2108 Diag(New->getLocation(), diag::err_returns_retained_mismatch);
2109 Diag(Old->getLocation(), diag::note_previous_declaration);
2110 return true;
2111 }
2112
2113 NewTypeInfo = NewTypeInfo.withProducesResult(true);
2114 RequiresAdjustment = true;
2115 }
2116
John McCalle6a365d2010-12-19 02:44:49 +00002117 if (RequiresAdjustment) {
2118 NewType = Context.adjustFunctionType(NewType, NewTypeInfo);
2119 New->setType(QualType(NewType, 0));
2120 NewQType = Context.getCanonicalType(New->getType());
Douglas Gregord2c64902010-06-18 21:30:25 +00002121 }
2122
David Blaikie4e4d0842012-03-11 07:00:24 +00002123 if (getLangOpts().CPlusPlus) {
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00002124 // (C++98 13.1p2):
2125 // Certain function declarations cannot be overloaded:
Mike Stump1eb44332009-09-09 15:08:12 +00002126 // -- Function declarations that differ only in the return type
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00002127 // cannot be overloaded.
John McCalle6a365d2010-12-19 02:44:49 +00002128 QualType OldReturnType = OldType->getResultType();
2129 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType();
Fariborz Jahanian2390a722010-05-19 21:37:30 +00002130 QualType ResQT;
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00002131 if (OldReturnType != NewReturnType) {
Fariborz Jahanian2390a722010-05-19 21:37:30 +00002132 if (NewReturnType->isObjCObjectPointerType()
2133 && OldReturnType->isObjCObjectPointerType())
2134 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType);
2135 if (ResQT.isNull()) {
Argyrios Kyrtzidis1de34dd2011-02-05 05:54:49 +00002136 if (New->isCXXClassMember() && New->isOutOfLine())
2137 Diag(New->getLocation(),
2138 diag::err_member_def_does_not_match_ret_type) << New;
2139 else
2140 Diag(New->getLocation(), diag::err_ovl_diff_return_type);
Fariborz Jahanian2390a722010-05-19 21:37:30 +00002141 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
2142 return true;
2143 }
2144 else
2145 NewQType = ResQT;
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00002146 }
2147
2148 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old);
John McCall3d043362010-04-13 07:45:41 +00002149 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New);
Anders Carlsson5c478cf2009-12-04 22:33:25 +00002150 if (OldMethod && NewMethod) {
John McCall3d043362010-04-13 07:45:41 +00002151 // Preserve triviality.
2152 NewMethod->setTrivial(OldMethod->isTrivial());
Francois Pichete1e96a62011-05-14 19:17:07 +00002153
Francois Pichetaf0f4d02011-08-14 03:52:19 +00002154 // MSVC allows explicit template specialization at class scope:
2155 // 2 CXMethodDecls referring to the same function will be injected.
2156 // We don't want a redeclartion error.
2157 bool IsClassScopeExplicitSpecialization =
2158 OldMethod->isFunctionTemplateSpecialization() &&
2159 NewMethod->isFunctionTemplateSpecialization();
John McCall3d043362010-04-13 07:45:41 +00002160 bool isFriend = NewMethod->getFriendObjectKind();
2161
Francois Pichetaf0f4d02011-08-14 03:52:19 +00002162 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() &&
2163 !IsClassScopeExplicitSpecialization) {
Anders Carlsson5c478cf2009-12-04 22:33:25 +00002164 // -- Member function declarations with the same name and the
2165 // same parameter types cannot be overloaded if any of them
2166 // is a static member function declaration.
2167 if (OldMethod->isStatic() || NewMethod->isStatic()) {
2168 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member);
2169 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
2170 return true;
2171 }
Richard Smith838925d2012-07-13 04:12:04 +00002172
Anders Carlsson5c478cf2009-12-04 22:33:25 +00002173 // C++ [class.mem]p1:
2174 // [...] A member shall not be declared twice in the
2175 // member-specification, except that a nested class or member
2176 // class template can be declared and then later defined.
Richard Smith838925d2012-07-13 04:12:04 +00002177 if (ActiveTemplateInstantiations.empty()) {
2178 unsigned NewDiag;
2179 if (isa<CXXConstructorDecl>(OldMethod))
2180 NewDiag = diag::err_constructor_redeclared;
2181 else if (isa<CXXDestructorDecl>(NewMethod))
2182 NewDiag = diag::err_destructor_redeclared;
2183 else if (isa<CXXConversionDecl>(NewMethod))
2184 NewDiag = diag::err_conv_function_redeclared;
2185 else
2186 NewDiag = diag::err_member_redeclared;
Anders Carlsson5c478cf2009-12-04 22:33:25 +00002187
Richard Smith838925d2012-07-13 04:12:04 +00002188 Diag(New->getLocation(), NewDiag);
2189 } else {
2190 Diag(New->getLocation(), diag::err_member_redeclared_in_instantiation)
2191 << New << New->getType();
2192 }
Douglas Gregor3e41d602009-02-13 23:20:09 +00002193 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
John McCall3d043362010-04-13 07:45:41 +00002194
2195 // Complain if this is an explicit declaration of a special
2196 // member that was initially declared implicitly.
2197 //
2198 // As an exception, it's okay to befriend such methods in order
2199 // to permit the implicit constructor/destructor/operator calls.
2200 } else if (OldMethod->isImplicit()) {
2201 if (isFriend) {
2202 NewMethod->setImplicit();
2203 } else {
Anders Carlsson5c478cf2009-12-04 22:33:25 +00002204 Diag(NewMethod->getLocation(),
2205 diag::err_definition_of_implicitly_declared_member)
Anders Carlsson3b8c53b2010-04-22 05:40:53 +00002206 << New << getSpecialMember(OldMethod);
Anders Carlsson5c478cf2009-12-04 22:33:25 +00002207 return true;
2208 }
Richard Smithf4fe8432012-06-08 01:30:54 +00002209 } else if (OldMethod->isExplicitlyDefaulted() && !isFriend) {
Sean Hunt001cad92011-05-10 00:49:42 +00002210 Diag(NewMethod->getLocation(),
2211 diag::err_definition_of_explicitly_defaulted_member)
2212 << getSpecialMember(OldMethod);
2213 return true;
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00002214 }
2215 }
2216
2217 // (C++98 8.3.5p3):
2218 // All declarations for a function shall agree exactly in both the
2219 // return type and the parameter-type-list.
John McCalle6a365d2010-12-19 02:44:49 +00002220 // We also want to respect all the extended bits except noreturn.
2221
2222 // noreturn should now match unless the old type info didn't have it.
2223 QualType OldQTypeForComparison = OldQType;
2224 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) {
2225 assert(OldQType == QualType(OldType, 0));
2226 const FunctionType *OldTypeForComparison
2227 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true));
2228 OldQTypeForComparison = QualType(OldTypeForComparison, 0);
2229 assert(OldQTypeForComparison.isCanonical());
2230 }
2231
2232 if (OldQTypeForComparison == NewQType)
James Molloy9cda03f2012-03-13 08:55:35 +00002233 return MergeCompatibleFunctionDecls(New, Old, S);
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00002234
2235 // Fall through for conflicting redeclarations and redefinitions.
Douglas Gregorf0097952008-04-21 02:02:58 +00002236 }
Chris Lattner04421082008-04-08 04:40:51 +00002237
2238 // C: Function types need to be compatible, not identical. This handles
Steve Naroffadbbd0c2008-01-14 20:51:29 +00002239 // duplicate function decls like "void f(int); void f(enum X);" properly.
David Blaikie4e4d0842012-03-11 07:00:24 +00002240 if (!getLangOpts().CPlusPlus &&
Eli Friedman3d815e72008-08-22 00:56:42 +00002241 Context.typesAreCompatible(OldQType, NewQType)) {
John McCall183700f2009-09-21 23:43:11 +00002242 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>();
2243 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>();
Douglas Gregor72564e72009-02-26 23:50:07 +00002244 const FunctionProtoType *OldProto = 0;
2245 if (isa<FunctionNoProtoType>(NewFuncType) &&
Douglas Gregorc8376562009-03-06 22:43:54 +00002246 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) {
Douglas Gregor68719812009-02-16 18:20:44 +00002247 // The old declaration provided a function prototype, but the
2248 // new declaration does not. Merge in the prototype.
Sebastian Redl465226e2009-05-27 22:11:52 +00002249 assert(!OldProto->hasExceptionSpec() && "Exception spec in C");
Chris Lattner5f9e2722011-07-23 10:55:15 +00002250 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(),
Douglas Gregor68719812009-02-16 18:20:44 +00002251 OldProto->arg_type_end());
2252 NewQType = Context.getFunctionType(NewFuncType->getResultType(),
Jay Foadbeaaccd2009-05-21 09:52:38 +00002253 ParamTypes.data(), ParamTypes.size(),
John McCalle23cf432010-12-14 08:05:40 +00002254 OldProto->getExtProtoInfo());
Douglas Gregor68719812009-02-16 18:20:44 +00002255 New->setType(NewQType);
Anders Carlssona75e8532009-05-14 21:46:00 +00002256 New->setHasInheritedPrototype();
Douglas Gregor450da982009-02-16 20:58:07 +00002257
2258 // Synthesize a parameter for each argument type.
Chris Lattner5f9e2722011-07-23 10:55:15 +00002259 SmallVector<ParmVarDecl*, 16> Params;
Mike Stump1eb44332009-09-09 15:08:12 +00002260 for (FunctionProtoType::arg_type_iterator
2261 ParamType = OldProto->arg_type_begin(),
Douglas Gregor450da982009-02-16 20:58:07 +00002262 ParamEnd = OldProto->arg_type_end();
2263 ParamType != ParamEnd; ++ParamType) {
2264 ParmVarDecl *Param = ParmVarDecl::Create(Context, New,
Abramo Bagnaraff676cb2011-03-08 08:55:46 +00002265 SourceLocation(),
Douglas Gregor450da982009-02-16 20:58:07 +00002266 SourceLocation(), 0,
John McCalla93c9342009-12-07 02:54:59 +00002267 *ParamType, /*TInfo=*/0,
John McCalld931b082010-08-26 03:08:43 +00002268 SC_None, SC_None,
Douglas Gregor16573fa2010-04-19 22:54:31 +00002269 0);
John McCallfb44de92011-05-01 22:35:37 +00002270 Param->setScopeInfo(0, Params.size());
Douglas Gregor450da982009-02-16 20:58:07 +00002271 Param->setImplicit();
2272 Params.push_back(Param);
2273 }
2274
David Blaikie4278c652011-09-21 18:16:56 +00002275 New->setParams(Params);
Mike Stump1eb44332009-09-09 15:08:12 +00002276 }
Douglas Gregor68719812009-02-16 18:20:44 +00002277
James Molloy9cda03f2012-03-13 08:55:35 +00002278 return MergeCompatibleFunctionDecls(New, Old, S);
Chris Lattner04421082008-04-08 04:40:51 +00002279 }
Chris Lattnere3995fe2007-11-06 06:07:26 +00002280
Douglas Gregorc8376562009-03-06 22:43:54 +00002281 // GNU C permits a K&R definition to follow a prototype declaration
2282 // if the declared types of the parameters in the K&R definition
2283 // match the types in the prototype declaration, even when the
2284 // promoted types of the parameters from the K&R definition differ
2285 // from the types in the prototype. GCC then keeps the types from
2286 // the prototype.
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00002287 //
2288 // If a variadic prototype is followed by a non-variadic K&R definition,
2289 // the K&R definition becomes variadic. This is sort of an edge case, but
2290 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and
2291 // C99 6.9.1p8.
David Blaikie4e4d0842012-03-11 07:00:24 +00002292 if (!getLangOpts().CPlusPlus &&
Douglas Gregorc8376562009-03-06 22:43:54 +00002293 Old->hasPrototype() && !New->hasPrototype() &&
John McCall183700f2009-09-21 23:43:11 +00002294 New->getType()->getAs<FunctionProtoType>() &&
Douglas Gregorc8376562009-03-06 22:43:54 +00002295 Old->getNumParams() == New->getNumParams()) {
Chris Lattner5f9e2722011-07-23 10:55:15 +00002296 SmallVector<QualType, 16> ArgTypes;
2297 SmallVector<GNUCompatibleParamWarning, 16> Warnings;
Mike Stump1eb44332009-09-09 15:08:12 +00002298 const FunctionProtoType *OldProto
John McCall183700f2009-09-21 23:43:11 +00002299 = Old->getType()->getAs<FunctionProtoType>();
Mike Stump1eb44332009-09-09 15:08:12 +00002300 const FunctionProtoType *NewProto
John McCall183700f2009-09-21 23:43:11 +00002301 = New->getType()->getAs<FunctionProtoType>();
Mike Stump1eb44332009-09-09 15:08:12 +00002302
Douglas Gregorc8376562009-03-06 22:43:54 +00002303 // Determine whether this is the GNU C extension.
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00002304 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(),
2305 NewProto->getResultType());
2306 bool LooseCompatible = !MergedReturn.isNull();
Mike Stump1eb44332009-09-09 15:08:12 +00002307 for (unsigned Idx = 0, End = Old->getNumParams();
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00002308 LooseCompatible && Idx != End; ++Idx) {
Douglas Gregorc8376562009-03-06 22:43:54 +00002309 ParmVarDecl *OldParm = Old->getParamDecl(Idx);
2310 ParmVarDecl *NewParm = New->getParamDecl(Idx);
Mike Stump1eb44332009-09-09 15:08:12 +00002311 if (Context.typesAreCompatible(OldParm->getType(),
Douglas Gregorc8376562009-03-06 22:43:54 +00002312 NewProto->getArgType(Idx))) {
2313 ArgTypes.push_back(NewParm->getType());
2314 } else if (Context.typesAreCompatible(OldParm->getType(),
Douglas Gregor447234d2010-07-29 15:18:02 +00002315 NewParm->getType(),
2316 /*CompareUnqualified=*/true)) {
Mike Stump1eb44332009-09-09 15:08:12 +00002317 GNUCompatibleParamWarning Warn
Douglas Gregorc8376562009-03-06 22:43:54 +00002318 = { OldParm, NewParm, NewProto->getArgType(Idx) };
2319 Warnings.push_back(Warn);
2320 ArgTypes.push_back(NewParm->getType());
2321 } else
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00002322 LooseCompatible = false;
Douglas Gregorc8376562009-03-06 22:43:54 +00002323 }
2324
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00002325 if (LooseCompatible) {
Douglas Gregorc8376562009-03-06 22:43:54 +00002326 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) {
2327 Diag(Warnings[Warn].NewParm->getLocation(),
2328 diag::ext_param_promoted_not_compatible_with_prototype)
2329 << Warnings[Warn].PromotedType
2330 << Warnings[Warn].OldParm->getType();
Douglas Gregor447234d2010-07-29 15:18:02 +00002331 if (Warnings[Warn].OldParm->getLocation().isValid())
2332 Diag(Warnings[Warn].OldParm->getLocation(),
2333 diag::note_previous_declaration);
Douglas Gregorc8376562009-03-06 22:43:54 +00002334 }
2335
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00002336 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0],
2337 ArgTypes.size(),
John McCalle23cf432010-12-14 08:05:40 +00002338 OldProto->getExtProtoInfo()));
James Molloy9cda03f2012-03-13 08:55:35 +00002339 return MergeCompatibleFunctionDecls(New, Old, S);
Douglas Gregorc8376562009-03-06 22:43:54 +00002340 }
2341
2342 // Fall through to diagnose conflicting types.
2343 }
2344
Steve Naroff837618c2008-01-16 15:01:34 +00002345 // A function that has already been declared has been redeclared or defined
2346 // with a different type- show appropriate diagnostic
Douglas Gregor7814e6d2009-09-12 00:22:50 +00002347 if (unsigned BuiltinID = Old->getBuiltinID()) {
Douglas Gregorcda9c672009-02-16 17:45:42 +00002348 // The user has declared a builtin function with an incompatible
2349 // signature.
2350 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) {
2351 // The function the user is redeclaring is a library-defined
2352 // function like 'malloc' or 'printf'. Warn about the
Douglas Gregor374e1562009-03-23 17:47:24 +00002353 // redeclaration, then pretend that we don't know about this
2354 // library built-in.
Douglas Gregorcda9c672009-02-16 17:45:42 +00002355 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New;
2356 Diag(Old->getLocation(), diag::note_previous_builtin_declaration)
2357 << Old << Old->getType();
Douglas Gregor374e1562009-03-23 17:47:24 +00002358 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin);
2359 Old->setInvalidDecl();
2360 return false;
Douglas Gregorcda9c672009-02-16 17:45:42 +00002361 }
Steve Naroff837618c2008-01-16 15:01:34 +00002362
Douglas Gregorcda9c672009-02-16 17:45:42 +00002363 PrevDiag = diag::note_previous_builtin_declaration;
2364 }
2365
Chris Lattnerd9d22dd2008-11-24 05:29:24 +00002366 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName();
Douglas Gregor3e41d602009-02-13 23:20:09 +00002367 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
Douglas Gregorcda9c672009-02-16 17:45:42 +00002368 return true;
Reid Spencer5f016e22007-07-11 17:01:13 +00002369}
2370
Douglas Gregor04495c82009-02-24 01:23:02 +00002371/// \brief Completes the merge of two function declarations that are
Mike Stump1eb44332009-09-09 15:08:12 +00002372/// known to be compatible.
Douglas Gregor04495c82009-02-24 01:23:02 +00002373///
2374/// This routine handles the merging of attributes and other
2375/// properties of function declarations form the old declaration to
2376/// the new declaration, once we know that New is in fact a
2377/// redeclaration of Old.
2378///
2379/// \returns false
James Molloy9cda03f2012-03-13 08:55:35 +00002380bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old,
2381 Scope *S) {
Douglas Gregor04495c82009-02-24 01:23:02 +00002382 // Merge the attributes
Douglas Gregor27c6da22012-01-01 20:30:41 +00002383 mergeDeclAttributes(New, Old);
Douglas Gregor04495c82009-02-24 01:23:02 +00002384
2385 // Merge the storage class.
John McCalld931b082010-08-26 03:08:43 +00002386 if (Old->getStorageClass() != SC_Extern &&
2387 Old->getStorageClass() != SC_None)
Douglas Gregor9f9bf252009-04-28 06:37:30 +00002388 New->setStorageClass(Old->getStorageClass());
Douglas Gregor04495c82009-02-24 01:23:02 +00002389
Douglas Gregor04495c82009-02-24 01:23:02 +00002390 // Merge "pure" flag.
2391 if (Old->isPure())
2392 New->setPure();
2393
Rafael Espindola8dbf6972012-11-25 14:07:59 +00002394 // Merge "used" flag.
2395 if (Old->isUsed(false))
2396 New->setUsed();
2397
John McCalleca5d222011-03-02 04:00:57 +00002398 // Merge attributes from the parameters. These can mismatch with K&R
2399 // declarations.
2400 if (New->getNumParams() == Old->getNumParams())
2401 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i)
2402 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i),
2403 Context);
2404
David Blaikie4e4d0842012-03-11 07:00:24 +00002405 if (getLangOpts().CPlusPlus)
James Molloy9cda03f2012-03-13 08:55:35 +00002406 return MergeCXXFunctionDecl(New, Old, S);
Douglas Gregor04495c82009-02-24 01:23:02 +00002407
Rafael Espindola8b8a09e2012-11-29 16:09:03 +00002408 // Merge the function types so the we get the composite types for the return
2409 // and argument types.
2410 QualType Merged = Context.mergeTypes(Old->getType(), New->getType());
2411 if (!Merged.isNull())
2412 New->setType(Merged);
2413
Douglas Gregor04495c82009-02-24 01:23:02 +00002414 return false;
2415}
2416
John McCallf85e1932011-06-15 23:02:42 +00002417
John McCalleca5d222011-03-02 04:00:57 +00002418void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod,
Douglas Gregor27c6da22012-01-01 20:30:41 +00002419 ObjCMethodDecl *oldMethod) {
John McCall6c2c2502011-07-22 02:45:48 +00002420
Fariborz Jahanian1ea67442012-06-05 21:14:46 +00002421 // Merge the attributes, including deprecated/unavailable
2422 mergeDeclAttributes(newMethod, oldMethod, /* mergeDeprecation */true);
John McCalleca5d222011-03-02 04:00:57 +00002423
2424 // Merge attributes from the parameters.
Douglas Gregor0a4a23a2012-05-17 23:13:29 +00002425 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(),
2426 oe = oldMethod->param_end();
Argyrios Kyrtzidis491306a2011-10-03 06:37:04 +00002427 for (ObjCMethodDecl::param_iterator
John McCalleca5d222011-03-02 04:00:57 +00002428 ni = newMethod->param_begin(), ne = newMethod->param_end();
Douglas Gregor0a4a23a2012-05-17 23:13:29 +00002429 ni != ne && oi != oe; ++ni, ++oi)
Douglas Gregor926df6c2011-06-11 01:09:30 +00002430 mergeParamDeclAttributes(*ni, *oi, Context);
John McCall6c2c2502011-07-22 02:45:48 +00002431
Douglas Gregor926df6c2011-06-11 01:09:30 +00002432 CheckObjCMethodOverride(newMethod, oldMethod, true);
John McCalleca5d222011-03-02 04:00:57 +00002433}
2434
Sebastian Redl60618fa2011-03-12 11:50:43 +00002435/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and
2436/// scope as a previous declaration 'Old'. Figure out how to merge their types,
Richard Smith34b41d92011-02-20 03:19:35 +00002437/// emitting diagnostics as appropriate.
2438///
2439/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back
Sebastian Redl5b9cc5d2012-02-11 23:51:47 +00002440/// to here in AddInitializerToDecl. We can't check them before the initializer
2441/// is attached.
Richard Smith34b41d92011-02-20 03:19:35 +00002442void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) {
2443 if (New->isInvalidDecl() || Old->isInvalidDecl())
2444 return;
2445
2446 QualType MergedT;
David Blaikie4e4d0842012-03-11 07:00:24 +00002447 if (getLangOpts().CPlusPlus) {
Richard Smith34b41d92011-02-20 03:19:35 +00002448 AutoType *AT = New->getType()->getContainedAutoType();
2449 if (AT && !AT->isDeduced()) {
2450 // We don't know what the new type is until the initializer is attached.
2451 return;
Sebastian Redl60618fa2011-03-12 11:50:43 +00002452 } else if (Context.hasSameType(New->getType(), Old->getType())) {
2453 // These could still be something that needs exception specs checked.
2454 return MergeVarDeclExceptionSpecs(New, Old);
2455 }
Richard Smith34b41d92011-02-20 03:19:35 +00002456 // C++ [basic.link]p10:
2457 // [...] the types specified by all declarations referring to a given
2458 // object or function shall be identical, except that declarations for an
2459 // array object can specify array types that differ by the presence or
2460 // absence of a major array bound (8.3.4).
2461 else if (Old->getType()->isIncompleteArrayType() &&
2462 New->getType()->isArrayType()) {
Eli Friedman6febf122012-12-13 01:43:21 +00002463 const ArrayType *OldArray = Context.getAsArrayType(Old->getType());
2464 const ArrayType *NewArray = Context.getAsArrayType(New->getType());
2465 if (Context.hasSameType(OldArray->getElementType(),
2466 NewArray->getElementType()))
Richard Smith34b41d92011-02-20 03:19:35 +00002467 MergedT = New->getType();
2468 } else if (Old->getType()->isArrayType() &&
2469 New->getType()->isIncompleteArrayType()) {
Eli Friedman6febf122012-12-13 01:43:21 +00002470 const ArrayType *OldArray = Context.getAsArrayType(Old->getType());
2471 const ArrayType *NewArray = Context.getAsArrayType(New->getType());
2472 if (Context.hasSameType(OldArray->getElementType(),
2473 NewArray->getElementType()))
Richard Smith34b41d92011-02-20 03:19:35 +00002474 MergedT = Old->getType();
2475 } else if (New->getType()->isObjCObjectPointerType()
2476 && Old->getType()->isObjCObjectPointerType()) {
2477 MergedT = Context.mergeObjCGCQualifiers(New->getType(),
2478 Old->getType());
2479 }
2480 } else {
2481 MergedT = Context.mergeTypes(New->getType(), Old->getType());
2482 }
2483 if (MergedT.isNull()) {
2484 Diag(New->getLocation(), diag::err_redefinition_different_type)
David Blaikiea405b252012-09-20 18:38:57 +00002485 << New->getDeclName() << New->getType() << Old->getType();
Richard Smith34b41d92011-02-20 03:19:35 +00002486 Diag(Old->getLocation(), diag::note_previous_definition);
2487 return New->setInvalidDecl();
2488 }
2489 New->setType(MergedT);
2490}
2491
Reid Spencer5f016e22007-07-11 17:01:13 +00002492/// MergeVarDecl - We just parsed a variable 'New' which has the same name
2493/// and scope as a previous declaration 'Old'. Figure out how to resolve this
2494/// situation, merging decls or emitting diagnostics as appropriate.
2495///
Mike Stump1eb44332009-09-09 15:08:12 +00002496/// Tentative definition rules (C99 6.9.2p2) are checked by
2497/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative
Steve Naroffff9eb1f2008-08-08 17:50:35 +00002498/// definitions here, since the initializer hasn't been attached.
Mike Stump1eb44332009-09-09 15:08:12 +00002499///
John McCall68263142009-11-18 22:49:29 +00002500void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) {
2501 // If the new decl is already invalid, don't do any other checking.
2502 if (New->isInvalidDecl())
2503 return;
Mike Stump1eb44332009-09-09 15:08:12 +00002504
Reid Spencer5f016e22007-07-11 17:01:13 +00002505 // Verify the old decl was also a variable.
John McCall68263142009-11-18 22:49:29 +00002506 VarDecl *Old = 0;
2507 if (!Previous.isSingleResult() ||
2508 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) {
Chris Lattnerf3a41af2008-11-20 06:38:18 +00002509 Diag(New->getLocation(), diag::err_redefinition_different_kind)
Chris Lattner08631c52008-11-23 21:45:46 +00002510 << New->getDeclName();
John McCall68263142009-11-18 22:49:29 +00002511 Diag(Previous.getRepresentativeDecl()->getLocation(),
2512 diag::note_previous_definition);
Chris Lattnereaaebc72009-04-25 08:06:05 +00002513 return New->setInvalidDecl();
Reid Spencer5f016e22007-07-11 17:01:13 +00002514 }
Chris Lattnerddee4232008-03-03 03:28:21 +00002515
Douglas Gregor7f6ff022010-08-30 14:32:14 +00002516 // C++ [class.mem]p1:
2517 // A member shall not be declared twice in the member-specification [...]
2518 //
2519 // Here, we need only consider static data members.
2520 if (Old->isStaticDataMember() && !New->isOutOfLine()) {
2521 Diag(New->getLocation(), diag::err_duplicate_member)
2522 << New->getIdentifier();
2523 Diag(Old->getLocation(), diag::note_previous_declaration);
2524 New->setInvalidDecl();
2525 }
2526
Douglas Gregor27c6da22012-01-01 20:30:41 +00002527 mergeDeclAttributes(New, Old);
David Blaikied662a792011-10-19 22:56:21 +00002528 // Warn if an already-declared variable is made a weak_import in a subsequent
2529 // declaration
Fariborz Jahanianab27d6e2011-06-20 17:50:03 +00002530 if (New->getAttr<WeakImportAttr>() &&
2531 Old->getStorageClass() == SC_None &&
Fariborz Jahaniand5431302011-06-22 22:08:50 +00002532 !Old->getAttr<WeakImportAttr>()) {
2533 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName();
2534 Diag(Old->getLocation(), diag::note_previous_definition);
2535 // Remove weak_import attribute on new declaration.
Fariborz Jahanianc3ca14d2011-06-23 17:50:10 +00002536 New->dropAttr<WeakImportAttr>();
Fariborz Jahaniand5431302011-06-22 22:08:50 +00002537 }
Chris Lattnerddee4232008-03-03 03:28:21 +00002538
Richard Smith34b41d92011-02-20 03:19:35 +00002539 // Merge the types.
2540 MergeVarDeclTypes(New, Old);
2541 if (New->isInvalidDecl())
2542 return;
Douglas Gregor656de632009-03-11 23:52:16 +00002543
Steve Naroffb7b032e2008-01-30 00:44:01 +00002544 // C99 6.2.2p4: Check if we have a static decl followed by a non-static.
John McCalld931b082010-08-26 03:08:43 +00002545 if (New->getStorageClass() == SC_Static &&
2546 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) {
Chris Lattnerd9d22dd2008-11-24 05:29:24 +00002547 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName();
Chris Lattner5f4a6822008-11-23 23:12:31 +00002548 Diag(Old->getLocation(), diag::note_previous_definition);
Chris Lattnereaaebc72009-04-25 08:06:05 +00002549 return New->setInvalidDecl();
Steve Naroffb7b032e2008-01-30 00:44:01 +00002550 }
Mike Stump1eb44332009-09-09 15:08:12 +00002551 // C99 6.2.2p4:
Douglas Gregor5ef122e2009-03-19 22:01:50 +00002552 // For an identifier declared with the storage-class specifier
2553 // extern in a scope in which a prior declaration of that
2554 // identifier is visible,23) if the prior declaration specifies
2555 // internal or external linkage, the linkage of the identifier at
2556 // the later declaration is the same as the linkage specified at
2557 // the prior declaration. If no prior declaration is visible, or
2558 // if the prior declaration specifies no linkage, then the
2559 // identifier has external linkage.
Douglas Gregor38179b22009-03-23 16:17:01 +00002560 if (New->hasExternalStorage() && Old->hasLinkage())
Douglas Gregor5ef122e2009-03-19 22:01:50 +00002561 /* Okay */;
John McCalld931b082010-08-26 03:08:43 +00002562 else if (New->getStorageClass() != SC_Static &&
2563 Old->getStorageClass() == SC_Static) {
Chris Lattnerd9d22dd2008-11-24 05:29:24 +00002564 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName();
Chris Lattner5f4a6822008-11-23 23:12:31 +00002565 Diag(Old->getLocation(), diag::note_previous_definition);
Chris Lattnereaaebc72009-04-25 08:06:05 +00002566 return New->setInvalidDecl();
Steve Naroffb7b032e2008-01-30 00:44:01 +00002567 }
Daniel Dunbar5466c7b2009-04-14 02:25:56 +00002568
Argyrios Kyrtzidis6684d852011-01-31 07:04:46 +00002569 // Check if extern is followed by non-extern and vice-versa.
2570 if (New->hasExternalStorage() &&
2571 !Old->hasLinkage() && Old->isLocalVarDecl()) {
2572 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName();
2573 Diag(Old->getLocation(), diag::note_previous_definition);
2574 return New->setInvalidDecl();
2575 }
2576 if (Old->hasExternalStorage() &&
2577 !New->hasLinkage() && New->isLocalVarDecl()) {
2578 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName();
2579 Diag(Old->getLocation(), diag::note_previous_definition);
2580 return New->setInvalidDecl();
2581 }
2582
Steve Naroff094cefb2008-09-17 14:05:40 +00002583 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup.
Mike Stump1eb44332009-09-09 15:08:12 +00002584
Daniel Dunbar5466c7b2009-04-14 02:25:56 +00002585 // FIXME: The test for external storage here seems wrong? We still
2586 // need to check for mismatches.
2587 if (!New->hasExternalStorage() && !New->isFileVarDecl() &&
Douglas Gregor656de632009-03-11 23:52:16 +00002588 // Don't complain about out-of-line definitions of static members.
2589 !(Old->getLexicalDeclContext()->isRecord() &&
2590 !New->getLexicalDeclContext()->isRecord())) {
Chris Lattner08631c52008-11-23 21:45:46 +00002591 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName();
Chris Lattner5f4a6822008-11-23 23:12:31 +00002592 Diag(Old->getLocation(), diag::note_previous_definition);
Chris Lattnereaaebc72009-04-25 08:06:05 +00002593 return New->setInvalidDecl();
Reid Spencer5f016e22007-07-11 17:01:13 +00002594 }
Douglas Gregor275a3692009-03-10 23:43:53 +00002595
Eli Friedman63054b32009-04-19 20:27:55 +00002596 if (New->isThreadSpecified() && !Old->isThreadSpecified()) {
2597 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName();
2598 Diag(Old->getLocation(), diag::note_previous_definition);
2599 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) {
2600 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName();
2601 Diag(Old->getLocation(), diag::note_previous_definition);
2602 }
2603
Sebastian Redl4cae1b32010-02-02 18:35:11 +00002604 // C++ doesn't have tentative definitions, so go right ahead and check here.
2605 const VarDecl *Def;
David Blaikie4e4d0842012-03-11 07:00:24 +00002606 if (getLangOpts().CPlusPlus &&
Sebastian Redl6c048a92010-02-03 02:08:48 +00002607 New->isThisDeclarationADefinition() == VarDecl::Definition &&
Sebastian Redl4cae1b32010-02-02 18:35:11 +00002608 (Def = Old->getDefinition())) {
2609 Diag(New->getLocation(), diag::err_redefinition)
2610 << New->getDeclName();
2611 Diag(Def->getLocation(), diag::note_previous_definition);
2612 New->setInvalidDecl();
2613 return;
2614 }
Fariborz Jahanianfba9e8f2010-06-25 00:05:45 +00002615 // c99 6.2.2 P4.
2616 // For an identifier declared with the storage-class specifier extern in a
2617 // scope in which a prior declaration of that identifier is visible, if
2618 // the prior declaration specifies internal or external linkage, the linkage
2619 // of the identifier at the later declaration is the same as the linkage
2620 // specified at the prior declaration.
2621 // FIXME. revisit this code.
Fariborz Jahanian2bf6d7b2010-06-21 16:08:37 +00002622 if (New->hasExternalStorage() &&
Rafael Espindolaa7a2f2a2012-12-18 04:18:55 +00002623 Old->getLinkage() == InternalLinkage)
Fariborz Jahanian2bf6d7b2010-06-21 16:08:37 +00002624 New->setStorageClass(Old->getStorageClass());
2625
Rafael Espindola8dbf6972012-11-25 14:07:59 +00002626 // Merge "used" flag.
2627 if (Old->isUsed(false))
2628 New->setUsed();
2629
Douglas Gregor275a3692009-03-10 23:43:53 +00002630 // Keep a chain of previous declarations.
2631 New->setPreviousDeclaration(Old);
John McCall46460a62010-01-20 21:53:11 +00002632
2633 // Inherit access appropriately.
2634 New->setAccess(Old->getAccess());
Reid Spencer5f016e22007-07-11 17:01:13 +00002635}
2636
2637/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with
2638/// no declarator (e.g. "struct foo;") is parsed.
John McCalld226f652010-08-21 09:40:31 +00002639Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS,
John McCallac4df242011-03-22 23:00:04 +00002640 DeclSpec &DS) {
Benjamin Kramer5354e772012-08-23 23:38:35 +00002641 return ParsedFreeStandingDeclSpec(S, AS, DS, MultiTemplateParamsArg());
Chandler Carruth0f4be742011-05-03 18:35:10 +00002642}
2643
2644/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with
2645/// no declarator (e.g. "struct foo;") is parsed. It also accopts template
2646/// parameters to cope with template friend declarations.
2647Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS,
2648 DeclSpec &DS,
2649 MultiTemplateParamsArg TemplateParams) {
John McCalle3af0232009-10-07 23:34:25 +00002650 Decl *TagD = 0;
Douglas Gregor1a51b4a2009-02-09 15:09:02 +00002651 TagDecl *Tag = 0;
2652 if (DS.getTypeSpecType() == DeclSpec::TST_class ||
2653 DS.getTypeSpecType() == DeclSpec::TST_struct ||
Joao Matos6666ed42012-08-31 18:45:21 +00002654 DS.getTypeSpecType() == DeclSpec::TST_interface ||
Douglas Gregor1a51b4a2009-02-09 15:09:02 +00002655 DS.getTypeSpecType() == DeclSpec::TST_union ||
Douglas Gregor4d9a16f2009-05-12 23:25:50 +00002656 DS.getTypeSpecType() == DeclSpec::TST_enum) {
John McCallb3d87482010-08-24 05:47:05 +00002657 TagD = DS.getRepAsDecl();
John McCalle3af0232009-10-07 23:34:25 +00002658
2659 if (!TagD) // We probably had an error
John McCalld226f652010-08-21 09:40:31 +00002660 return 0;
Douglas Gregor4d9a16f2009-05-12 23:25:50 +00002661
John McCall67d1a672009-08-06 02:15:43 +00002662 // Note that the above type specs guarantee that the
2663 // type rep is a Decl, whereas in many of the others
2664 // it's a Type.
Peter Collingbourne0661bd0c2011-10-23 17:07:16 +00002665 if (isa<TagDecl>(TagD))
2666 Tag = cast<TagDecl>(TagD);
2667 else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD))
2668 Tag = CTD->getTemplatedDecl();
Douglas Gregor4d9a16f2009-05-12 23:25:50 +00002669 }
Douglas Gregor1a51b4a2009-02-09 15:09:02 +00002670
Argyrios Kyrtzidis216f78b2012-03-09 20:10:30 +00002671 if (Tag) {
David Blaikie66cff722012-11-14 01:52:05 +00002672 getASTContext().addUnnamedTag(Tag);
Argyrios Kyrtzidis717a20b2011-09-30 22:11:31 +00002673 Tag->setFreeStanding();
Argyrios Kyrtzidis216f78b2012-03-09 20:10:30 +00002674 if (Tag->isInvalidDecl())
2675 return Tag;
2676 }
Argyrios Kyrtzidis717a20b2011-09-30 22:11:31 +00002677
Nuno Lopes0a8bab02009-12-17 11:35:26 +00002678 if (unsigned TypeQuals = DS.getTypeQualifiers()) {
2679 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object
2680 // or incomplete types shall not be restrict-qualified."
2681 if (TypeQuals & DeclSpec::TQ_restrict)
2682 Diag(DS.getRestrictSpecLoc(),
2683 diag::err_typecheck_invalid_restrict_not_pointer_noarg)
2684 << DS.getSourceRange();
2685 }
2686
Richard Smithaf1fc7a2011-08-15 21:04:07 +00002687 if (DS.isConstexprSpecified()) {
2688 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations
2689 // and definitions of functions and variables.
2690 if (Tag)
2691 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag)
2692 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 :
2693 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 :
Joao Matos6666ed42012-08-31 18:45:21 +00002694 DS.getTypeSpecType() == DeclSpec::TST_interface ? 2 :
2695 DS.getTypeSpecType() == DeclSpec::TST_union ? 3 : 4);
Richard Smithaf1fc7a2011-08-15 21:04:07 +00002696 else
2697 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators);
2698 // Don't emit warnings after this error.
2699 return TagD;
2700 }
2701
Douglas Gregord85bea22009-09-26 06:47:28 +00002702 if (DS.isFriendSpecified()) {
John McCall9a34edb2010-10-19 01:40:49 +00002703 // If we're dealing with a decl but not a TagDecl, assume that
2704 // whatever routines created it handled the friendship aspect.
2705 if (TagD && !Tag)
John McCalld226f652010-08-21 09:40:31 +00002706 return 0;
Chandler Carruth0f4be742011-05-03 18:35:10 +00002707 return ActOnFriendTypeDecl(S, DS, TemplateParams);
Douglas Gregord85bea22009-09-26 06:47:28 +00002708 }
John McCallac4df242011-03-22 23:00:04 +00002709
2710 // Track whether we warned about the fact that there aren't any
2711 // declarators.
2712 bool emittedWarning = false;
Douglas Gregord85bea22009-09-26 06:47:28 +00002713
Douglas Gregor4920f1f2009-01-12 22:49:06 +00002714 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) {
John McCall5e1cdac2011-10-07 06:10:15 +00002715 if (!Record->getDeclName() && Record->isCompleteDefinition() &&
Douglas Gregora71c1292009-03-06 23:06:59 +00002716 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) {
David Blaikie4e4d0842012-03-11 07:00:24 +00002717 if (getLangOpts().CPlusPlus ||
Douglas Gregora71c1292009-03-06 23:06:59 +00002718 Record->getDeclContext()->isRecord())
John McCallaec03712010-05-21 20:45:30 +00002719 return BuildAnonymousStructOrUnion(S, DS, AS, Record);
Douglas Gregora71c1292009-03-06 23:06:59 +00002720
Daniel Dunbar96a00142012-03-09 18:35:03 +00002721 Diag(DS.getLocStart(), diag::ext_no_declarators)
Douglas Gregora71c1292009-03-06 23:06:59 +00002722 << DS.getSourceRange();
John McCallac4df242011-03-22 23:00:04 +00002723 emittedWarning = true;
Douglas Gregora71c1292009-03-06 23:06:59 +00002724 }
Francois Pichet8e161ed2010-11-23 06:07:27 +00002725 }
Douglas Gregor4920f1f2009-01-12 22:49:06 +00002726
Francois Pichet8e161ed2010-11-23 06:07:27 +00002727 // Check for Microsoft C extension: anonymous struct.
David Blaikie4e4d0842012-03-11 07:00:24 +00002728 if (getLangOpts().MicrosoftExt && !getLangOpts().CPlusPlus &&
Francois Pichet8e161ed2010-11-23 06:07:27 +00002729 CurContext->isRecord() &&
2730 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) {
2731 // Handle 2 kinds of anonymous struct:
2732 // struct STRUCT;
2733 // and
2734 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct.
2735 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag);
John McCall5e1cdac2011-10-07 06:10:15 +00002736 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) ||
Francois Pichet8e161ed2010-11-23 06:07:27 +00002737 (DS.getTypeSpecType() == DeclSpec::TST_typename &&
2738 DS.getRepAsType().get()->isStructureType())) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00002739 Diag(DS.getLocStart(), diag::ext_ms_anonymous_struct)
Francois Pichet8e161ed2010-11-23 06:07:27 +00002740 << DS.getSourceRange();
2741 return BuildMicrosoftCAnonymousStruct(S, DS, Record);
2742 }
Douglas Gregor4920f1f2009-01-12 22:49:06 +00002743 }
Douglas Gregord85bea22009-09-26 06:47:28 +00002744
David Blaikie4e4d0842012-03-11 07:00:24 +00002745 if (getLangOpts().CPlusPlus &&
Douglas Gregora131d0f2010-07-13 06:24:26 +00002746 DS.getStorageClassSpec() != DeclSpec::SCS_typedef)
2747 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag))
2748 if (Enum->enumerator_begin() == Enum->enumerator_end() &&
John McCallac4df242011-03-22 23:00:04 +00002749 !Enum->getIdentifier() && !Enum->isInvalidDecl()) {
Douglas Gregora131d0f2010-07-13 06:24:26 +00002750 Diag(Enum->getLocation(), diag::ext_no_declarators)
2751 << DS.getSourceRange();
John McCallac4df242011-03-22 23:00:04 +00002752 emittedWarning = true;
2753 }
2754
2755 // Skip all the checks below if we have a type error.
2756 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD;
Douglas Gregora131d0f2010-07-13 06:24:26 +00002757
John McCallac4df242011-03-22 23:00:04 +00002758 if (!DS.isMissingDeclaratorOk()) {
Douglas Gregor21282df2009-01-22 16:23:54 +00002759 // Warn about typedefs of enums without names, since this is an
Douglas Gregora0ebd602010-07-16 15:40:40 +00002760 // extension in both Microsoft and GNU.
Douglas Gregor8158f692009-01-17 02:55:50 +00002761 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef &&
2762 Tag && isa<EnumDecl>(Tag)) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00002763 Diag(DS.getLocStart(), diag::ext_typedef_without_a_name)
Douglas Gregora0ebd602010-07-16 15:40:40 +00002764 << DS.getSourceRange();
John McCalld226f652010-08-21 09:40:31 +00002765 return Tag;
Douglas Gregoree159c12009-01-13 23:10:51 +00002766 }
2767
Daniel Dunbar96a00142012-03-09 18:35:03 +00002768 Diag(DS.getLocStart(), diag::ext_no_declarators)
Sebastian Redla4ed0d82008-12-28 15:28:59 +00002769 << DS.getSourceRange();
John McCallac4df242011-03-22 23:00:04 +00002770 emittedWarning = true;
Sebastian Redla4ed0d82008-12-28 15:28:59 +00002771 }
Mike Stump1eb44332009-09-09 15:08:12 +00002772
John McCallac4df242011-03-22 23:00:04 +00002773 // We're going to complain about a bunch of spurious specifiers;
2774 // only do this if we're declaring a tag, because otherwise we
2775 // should be getting diag::ext_no_declarators.
2776 if (emittedWarning || (TagD && TagD->isInvalidDecl()))
2777 return TagD;
2778
John McCall379246d2011-03-26 02:09:52 +00002779 // Note that a linkage-specification sets a storage class, but
2780 // 'extern "C" struct foo;' is actually valid and not theoretically
2781 // useless.
John McCallac4df242011-03-22 23:00:04 +00002782 if (DeclSpec::SCS scs = DS.getStorageClassSpec())
John McCall379246d2011-03-26 02:09:52 +00002783 if (!DS.isExternInLinkageSpec())
2784 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier)
2785 << DeclSpec::getSpecifierName(scs);
2786
John McCallac4df242011-03-22 23:00:04 +00002787 if (DS.isThreadSpecified())
2788 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread";
2789 if (DS.getTypeQualifiers()) {
2790 if (DS.getTypeQualifiers() & DeclSpec::TQ_const)
2791 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const";
2792 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile)
2793 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile";
2794 // Restrict is covered above.
2795 }
2796 if (DS.isInlineSpecified())
2797 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline";
2798 if (DS.isVirtualSpecified())
2799 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual";
2800 if (DS.isExplicitSpecified())
2801 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit";
2802
Douglas Gregore3895852011-09-12 18:37:38 +00002803 if (DS.isModulePrivateSpecified() &&
2804 Tag && Tag->getDeclContext()->isFunctionOrMethod())
2805 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class)
2806 << Tag->getTagKind()
2807 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc());
2808
Eli Friedmanfc038e92011-12-17 00:36:09 +00002809 // Warn about ignored type attributes, for example:
2810 // __attribute__((aligned)) struct A;
Bill Wendlingad017fa2012-12-20 19:22:21 +00002811 // Attributes should be placed after tag to apply to type declaration.
Eli Friedmanfc038e92011-12-17 00:36:09 +00002812 if (!DS.getAttributes().empty()) {
2813 DeclSpec::TST TypeSpecType = DS.getTypeSpecType();
2814 if (TypeSpecType == DeclSpec::TST_class ||
2815 TypeSpecType == DeclSpec::TST_struct ||
Joao Matos6666ed42012-08-31 18:45:21 +00002816 TypeSpecType == DeclSpec::TST_interface ||
Eli Friedmanfc038e92011-12-17 00:36:09 +00002817 TypeSpecType == DeclSpec::TST_union ||
2818 TypeSpecType == DeclSpec::TST_enum) {
2819 AttributeList* attrs = DS.getAttributes().getList();
2820 while (attrs) {
Michael Han45bed132012-10-04 16:42:52 +00002821 Diag(attrs->getLoc(), diag::warn_declspec_attribute_ignored)
Eli Friedmanfc038e92011-12-17 00:36:09 +00002822 << attrs->getName()
2823 << (TypeSpecType == DeclSpec::TST_class ? 0 :
2824 TypeSpecType == DeclSpec::TST_struct ? 1 :
Joao Matos6666ed42012-08-31 18:45:21 +00002825 TypeSpecType == DeclSpec::TST_union ? 2 :
2826 TypeSpecType == DeclSpec::TST_interface ? 3 : 4);
Eli Friedmanfc038e92011-12-17 00:36:09 +00002827 attrs = attrs->getNext();
2828 }
2829 }
2830 }
John McCallac4df242011-03-22 23:00:04 +00002831
Dmitri Gribenkoa5ef44f2012-07-11 21:38:39 +00002832 ActOnDocumentableDecl(TagD);
2833
John McCalld226f652010-08-21 09:40:31 +00002834 return TagD;
Douglas Gregorbcbffc42009-01-07 00:43:41 +00002835}
2836
John McCall1d7c5282009-12-18 10:40:03 +00002837/// We are trying to inject an anonymous member into the given scope;
John McCall68263142009-11-18 22:49:29 +00002838/// check if there's an existing declaration that can't be overloaded.
2839///
2840/// \return true if this is a forbidden redeclaration
John McCall1d7c5282009-12-18 10:40:03 +00002841static bool CheckAnonMemberRedeclaration(Sema &SemaRef,
2842 Scope *S,
Fariborz Jahanian588a4ad2010-01-22 18:30:17 +00002843 DeclContext *Owner,
John McCall1d7c5282009-12-18 10:40:03 +00002844 DeclarationName Name,
2845 SourceLocation NameLoc,
2846 unsigned diagnostic) {
2847 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName,
2848 Sema::ForRedeclaration);
2849 if (!SemaRef.LookupName(R, S)) return false;
John McCall68263142009-11-18 22:49:29 +00002850
John McCall1d7c5282009-12-18 10:40:03 +00002851 if (R.getAsSingle<TagDecl>())
John McCall68263142009-11-18 22:49:29 +00002852 return false;
2853
2854 // Pick a representative declaration.
John McCall1d7c5282009-12-18 10:40:03 +00002855 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl();
Argyrios Kyrtzidis2b642392010-09-23 14:26:01 +00002856 assert(PrevDecl && "Expected a non-null Decl");
2857
2858 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S))
2859 return false;
John McCall68263142009-11-18 22:49:29 +00002860
John McCall1d7c5282009-12-18 10:40:03 +00002861 SemaRef.Diag(NameLoc, diagnostic) << Name;
2862 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
John McCall68263142009-11-18 22:49:29 +00002863
2864 return true;
2865}
2866
Douglas Gregorbcbffc42009-01-07 00:43:41 +00002867/// InjectAnonymousStructOrUnionMembers - Inject the members of the
2868/// anonymous struct or union AnonRecord into the owning context Owner
2869/// and scope S. This routine will be invoked just after we realize
2870/// that an unnamed union or struct is actually an anonymous union or
2871/// struct, e.g.,
2872///
2873/// @code
2874/// union {
2875/// int i;
2876/// float f;
2877/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and
2878/// // f into the surrounding scope.x
2879/// @endcode
2880///
2881/// This routine is recursive, injecting the names of nested anonymous
2882/// structs/unions into the owning context and scope as well.
John McCallaec03712010-05-21 20:45:30 +00002883static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S,
2884 DeclContext *Owner,
2885 RecordDecl *AnonRecord,
Francois Pichet87c2e122010-11-21 06:08:52 +00002886 AccessSpecifier AS,
Chris Lattner5f9e2722011-07-23 10:55:15 +00002887 SmallVector<NamedDecl*, 2> &Chaining,
Francois Pichet8e161ed2010-11-23 06:07:27 +00002888 bool MSAnonStruct) {
John McCall68263142009-11-18 22:49:29 +00002889 unsigned diagKind
2890 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl
2891 : diag::err_anonymous_struct_member_redecl;
2892
Douglas Gregorbcbffc42009-01-07 00:43:41 +00002893 bool Invalid = false;
Francois Pichet8e161ed2010-11-23 06:07:27 +00002894
2895 // Look every FieldDecl and IndirectFieldDecl with a name.
2896 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(),
2897 DEnd = AnonRecord->decls_end();
2898 D != DEnd; ++D) {
2899 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) &&
2900 cast<NamedDecl>(*D)->getDeclName()) {
2901 ValueDecl *VD = cast<ValueDecl>(*D);
2902 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(),
2903 VD->getLocation(), diagKind)) {
Douglas Gregorbcbffc42009-01-07 00:43:41 +00002904 // C++ [class.union]p2:
2905 // The names of the members of an anonymous union shall be
2906 // distinct from the names of any other entity in the
2907 // scope in which the anonymous union is declared.
Douglas Gregorbcbffc42009-01-07 00:43:41 +00002908 Invalid = true;
2909 } else {
2910 // C++ [class.union]p2:
2911 // For the purpose of name lookup, after the anonymous union
2912 // definition, the members of the anonymous union are
2913 // considered to have been defined in the scope in which the
2914 // anonymous union is declared.
Francois Pichet8e161ed2010-11-23 06:07:27 +00002915 unsigned OldChainingSize = Chaining.size();
2916 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD))
2917 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(),
2918 PE = IF->chain_end(); PI != PE; ++PI)
2919 Chaining.push_back(*PI);
2920 else
2921 Chaining.push_back(VD);
2922
Francois Pichet87c2e122010-11-21 06:08:52 +00002923 assert(Chaining.size() >= 2);
2924 NamedDecl **NamedChain =
2925 new (SemaRef.Context)NamedDecl*[Chaining.size()];
2926 for (unsigned i = 0; i < Chaining.size(); i++)
2927 NamedChain[i] = Chaining[i];
2928
2929 IndirectFieldDecl* IndirectField =
Francois Pichet8e161ed2010-11-23 06:07:27 +00002930 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(),
2931 VD->getIdentifier(), VD->getType(),
Francois Pichet87c2e122010-11-21 06:08:52 +00002932 NamedChain, Chaining.size());
2933
2934 IndirectField->setAccess(AS);
2935 IndirectField->setImplicit();
2936 SemaRef.PushOnScopeChains(IndirectField, S);
John McCallaec03712010-05-21 20:45:30 +00002937
2938 // That includes picking up the appropriate access specifier.
Francois Pichet8e161ed2010-11-23 06:07:27 +00002939 if (AS != AS_none) IndirectField->setAccess(AS);
Francois Pichet87c2e122010-11-21 06:08:52 +00002940
Francois Pichet8e161ed2010-11-23 06:07:27 +00002941 Chaining.resize(OldChainingSize);
Douglas Gregorbcbffc42009-01-07 00:43:41 +00002942 }
Douglas Gregorbcbffc42009-01-07 00:43:41 +00002943 }
2944 }
2945
2946 return Invalid;
2947}
2948
Douglas Gregor16573fa2010-04-19 22:54:31 +00002949/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to
2950/// a VarDecl::StorageClass. Any error reporting is up to the caller:
John McCalld931b082010-08-26 03:08:43 +00002951/// illegal input values are mapped to SC_None.
2952static StorageClass
Abramo Bagnara35f9a192010-07-30 16:47:02 +00002953StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) {
Douglas Gregor16573fa2010-04-19 22:54:31 +00002954 switch (StorageClassSpec) {
John McCalld931b082010-08-26 03:08:43 +00002955 case DeclSpec::SCS_unspecified: return SC_None;
2956 case DeclSpec::SCS_extern: return SC_Extern;
2957 case DeclSpec::SCS_static: return SC_Static;
2958 case DeclSpec::SCS_auto: return SC_Auto;
2959 case DeclSpec::SCS_register: return SC_Register;
2960 case DeclSpec::SCS_private_extern: return SC_PrivateExtern;
Douglas Gregor16573fa2010-04-19 22:54:31 +00002961 // Illegal SCSs map to None: error reporting is up to the caller.
2962 case DeclSpec::SCS_mutable: // Fall through.
John McCalld931b082010-08-26 03:08:43 +00002963 case DeclSpec::SCS_typedef: return SC_None;
Douglas Gregor16573fa2010-04-19 22:54:31 +00002964 }
2965 llvm_unreachable("unknown storage class specifier");
2966}
2967
2968/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to
John McCalld931b082010-08-26 03:08:43 +00002969/// a StorageClass. Any error reporting is up to the caller:
2970/// illegal input values are mapped to SC_None.
2971static StorageClass
Abramo Bagnara35f9a192010-07-30 16:47:02 +00002972StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) {
Douglas Gregor16573fa2010-04-19 22:54:31 +00002973 switch (StorageClassSpec) {
John McCalld931b082010-08-26 03:08:43 +00002974 case DeclSpec::SCS_unspecified: return SC_None;
2975 case DeclSpec::SCS_extern: return SC_Extern;
2976 case DeclSpec::SCS_static: return SC_Static;
2977 case DeclSpec::SCS_private_extern: return SC_PrivateExtern;
Douglas Gregor16573fa2010-04-19 22:54:31 +00002978 // Illegal SCSs map to None: error reporting is up to the caller.
2979 case DeclSpec::SCS_auto: // Fall through.
2980 case DeclSpec::SCS_mutable: // Fall through.
2981 case DeclSpec::SCS_register: // Fall through.
John McCalld931b082010-08-26 03:08:43 +00002982 case DeclSpec::SCS_typedef: return SC_None;
Douglas Gregor16573fa2010-04-19 22:54:31 +00002983 }
2984 llvm_unreachable("unknown storage class specifier");
2985}
2986
Francois Pichet8e161ed2010-11-23 06:07:27 +00002987/// BuildAnonymousStructOrUnion - Handle the declaration of an
Douglas Gregorbcbffc42009-01-07 00:43:41 +00002988/// anonymous structure or union. Anonymous unions are a C++ feature
Hans Wennborgacbabf12012-02-03 15:47:04 +00002989/// (C++ [class.union]) and a C11 feature; anonymous structures
2990/// are a C11 feature and GNU C++ extension.
John McCalld226f652010-08-21 09:40:31 +00002991Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS,
2992 AccessSpecifier AS,
2993 RecordDecl *Record) {
Douglas Gregorbcbffc42009-01-07 00:43:41 +00002994 DeclContext *Owner = Record->getDeclContext();
2995
2996 // Diagnose whether this anonymous struct/union is an extension.
David Blaikie4e4d0842012-03-11 07:00:24 +00002997 if (Record->isUnion() && !getLangOpts().CPlusPlus && !getLangOpts().C11)
Douglas Gregorbcbffc42009-01-07 00:43:41 +00002998 Diag(Record->getLocation(), diag::ext_anonymous_union);
David Blaikie4e4d0842012-03-11 07:00:24 +00002999 else if (!Record->isUnion() && getLangOpts().CPlusPlus)
Hans Wennborgacbabf12012-02-03 15:47:04 +00003000 Diag(Record->getLocation(), diag::ext_gnu_anonymous_struct);
David Blaikie4e4d0842012-03-11 07:00:24 +00003001 else if (!Record->isUnion() && !getLangOpts().C11)
Hans Wennborgacbabf12012-02-03 15:47:04 +00003002 Diag(Record->getLocation(), diag::ext_c11_anonymous_struct);
Mike Stump1eb44332009-09-09 15:08:12 +00003003
Douglas Gregorbcbffc42009-01-07 00:43:41 +00003004 // C and C++ require different kinds of checks for anonymous
3005 // structs/unions.
3006 bool Invalid = false;
David Blaikie4e4d0842012-03-11 07:00:24 +00003007 if (getLangOpts().CPlusPlus) {
Douglas Gregorbcbffc42009-01-07 00:43:41 +00003008 const char* PrevSpec = 0;
John McCallfec54012009-08-03 20:12:06 +00003009 unsigned DiagID;
David Blaikie2b79c322011-10-19 22:43:29 +00003010 if (Record->isUnion()) {
3011 // C++ [class.union]p6:
3012 // Anonymous unions declared in a named namespace or in the
3013 // global namespace shall be declared static.
3014 if (DS.getStorageClassSpec() != DeclSpec::SCS_static &&
3015 (isa<TranslationUnitDecl>(Owner) ||
3016 (isa<NamespaceDecl>(Owner) &&
3017 cast<NamespaceDecl>(Owner)->getDeclName()))) {
David Blaikie82c8ca12011-10-20 02:49:08 +00003018 Diag(Record->getLocation(), diag::err_anonymous_union_not_static)
3019 << FixItHint::CreateInsertion(Record->getLocation(), "static ");
David Blaikie2b79c322011-10-19 22:43:29 +00003020
3021 // Recover by adding 'static'.
3022 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(),
3023 PrevSpec, DiagID);
3024 }
3025 // C++ [class.union]p6:
3026 // A storage class is not allowed in a declaration of an
3027 // anonymous union in a class scope.
3028 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified &&
3029 isa<RecordDecl>(Owner)) {
3030 Diag(DS.getStorageClassSpecLoc(),
David Blaikief6f876c2011-10-20 02:10:55 +00003031 diag::err_anonymous_union_with_storage_spec)
3032 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
David Blaikie2b79c322011-10-19 22:43:29 +00003033
3034 // Recover by removing the storage specifier.
David Blaikied662a792011-10-19 22:56:21 +00003035 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified,
3036 SourceLocation(),
David Blaikie2b79c322011-10-19 22:43:29 +00003037 PrevSpec, DiagID);
3038 }
Douglas Gregorbcbffc42009-01-07 00:43:41 +00003039 }
Douglas Gregor6b3945f2009-01-07 19:46:03 +00003040
Douglas Gregor7604f642011-05-09 23:05:33 +00003041 // Ignore const/volatile/restrict qualifiers.
3042 if (DS.getTypeQualifiers()) {
3043 if (DS.getTypeQualifiers() & DeclSpec::TQ_const)
3044 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified)
3045 << Record->isUnion() << 0
3046 << FixItHint::CreateRemoval(DS.getConstSpecLoc());
3047 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile)
David Blaikied662a792011-10-19 22:56:21 +00003048 Diag(DS.getVolatileSpecLoc(),
3049 diag::ext_anonymous_struct_union_qualified)
Douglas Gregor7604f642011-05-09 23:05:33 +00003050 << Record->isUnion() << 1
3051 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc());
3052 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict)
David Blaikied662a792011-10-19 22:56:21 +00003053 Diag(DS.getRestrictSpecLoc(),
3054 diag::ext_anonymous_struct_union_qualified)
Douglas Gregor7604f642011-05-09 23:05:33 +00003055 << Record->isUnion() << 2
3056 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc());
3057
3058 DS.ClearTypeQualifiers();
3059 }
3060
Mike Stump1eb44332009-09-09 15:08:12 +00003061 // C++ [class.union]p2:
Douglas Gregor6b3945f2009-01-07 19:46:03 +00003062 // The member-specification of an anonymous union shall only
3063 // define non-static data members. [Note: nested types and
3064 // functions cannot be declared within an anonymous union. ]
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00003065 for (DeclContext::decl_iterator Mem = Record->decls_begin(),
3066 MemEnd = Record->decls_end();
Douglas Gregor6b3945f2009-01-07 19:46:03 +00003067 Mem != MemEnd; ++Mem) {
3068 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) {
3069 // C++ [class.union]p3:
3070 // An anonymous union shall not have private or protected
3071 // members (clause 11).
John McCallaec03712010-05-21 20:45:30 +00003072 assert(FD->getAccess() != AS_none);
3073 if (FD->getAccess() != AS_public) {
Douglas Gregor6b3945f2009-01-07 19:46:03 +00003074 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member)
3075 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected);
3076 Invalid = true;
3077 }
Argyrios Kyrtzidisdd7744d2010-08-16 17:27:08 +00003078
Sean Huntcf34e752011-05-16 22:41:40 +00003079 // C++ [class.union]p1
3080 // An object of a class with a non-trivial constructor, a non-trivial
3081 // copy constructor, a non-trivial destructor, or a non-trivial copy
3082 // assignment operator cannot be a member of a union, nor can an
3083 // array of such objects.
Richard Smithe7d7c392011-10-19 20:41:51 +00003084 if (CheckNontrivialField(FD))
Argyrios Kyrtzidisdd7744d2010-08-16 17:27:08 +00003085 Invalid = true;
Douglas Gregor6b3945f2009-01-07 19:46:03 +00003086 } else if ((*Mem)->isImplicit()) {
3087 // Any implicit members are fine.
Douglas Gregor1931b442009-02-03 00:34:39 +00003088 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) {
3089 // This is a type that showed up in an
3090 // elaborated-type-specifier inside the anonymous struct or
3091 // union, but which actually declares a type outside of the
3092 // anonymous struct or union. It's okay.
Douglas Gregor6b3945f2009-01-07 19:46:03 +00003093 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) {
3094 if (!MemRecord->isAnonymousStructOrUnion() &&
3095 MemRecord->getDeclName()) {
Francois Pichet538e0d02010-09-08 11:32:25 +00003096 // Visual C++ allows type definition in anonymous struct or union.
David Blaikie4e4d0842012-03-11 07:00:24 +00003097 if (getLangOpts().MicrosoftExt)
Francois Pichet538e0d02010-09-08 11:32:25 +00003098 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type)
3099 << (int)Record->isUnion();
3100 else {
3101 // This is a nested type declaration.
3102 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type)
3103 << (int)Record->isUnion();
3104 Invalid = true;
3105 }
Douglas Gregor6b3945f2009-01-07 19:46:03 +00003106 }
Abramo Bagnara6206d532010-06-05 05:09:32 +00003107 } else if (isa<AccessSpecDecl>(*Mem)) {
3108 // Any access specifier is fine.
Douglas Gregor6b3945f2009-01-07 19:46:03 +00003109 } else {
3110 // We have something that isn't a non-static data
3111 // member. Complain about it.
3112 unsigned DK = diag::err_anonymous_record_bad_member;
3113 if (isa<TypeDecl>(*Mem))
3114 DK = diag::err_anonymous_record_with_type;
3115 else if (isa<FunctionDecl>(*Mem))
3116 DK = diag::err_anonymous_record_with_function;
3117 else if (isa<VarDecl>(*Mem))
3118 DK = diag::err_anonymous_record_with_static;
Francois Pichet538e0d02010-09-08 11:32:25 +00003119
3120 // Visual C++ allows type definition in anonymous struct or union.
David Blaikie4e4d0842012-03-11 07:00:24 +00003121 if (getLangOpts().MicrosoftExt &&
Francois Pichet538e0d02010-09-08 11:32:25 +00003122 DK == diag::err_anonymous_record_with_type)
3123 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type)
Douglas Gregor6b3945f2009-01-07 19:46:03 +00003124 << (int)Record->isUnion();
Francois Pichet538e0d02010-09-08 11:32:25 +00003125 else {
3126 Diag((*Mem)->getLocation(), DK)
3127 << (int)Record->isUnion();
Douglas Gregor6b3945f2009-01-07 19:46:03 +00003128 Invalid = true;
Francois Pichet538e0d02010-09-08 11:32:25 +00003129 }
Douglas Gregor6b3945f2009-01-07 19:46:03 +00003130 }
3131 }
Mike Stump1eb44332009-09-09 15:08:12 +00003132 }
Douglas Gregorbcbffc42009-01-07 00:43:41 +00003133
3134 if (!Record->isUnion() && !Owner->isRecord()) {
Douglas Gregor4920f1f2009-01-12 22:49:06 +00003135 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member)
David Blaikie4e4d0842012-03-11 07:00:24 +00003136 << (int)getLangOpts().CPlusPlus;
Douglas Gregorbcbffc42009-01-07 00:43:41 +00003137 Invalid = true;
3138 }
3139
John McCalleb692e02009-10-22 23:31:08 +00003140 // Mock up a declarator.
Argyrios Kyrtzidisd3880f82011-06-28 03:01:18 +00003141 Declarator Dc(DS, Declarator::MemberContext);
John McCallbf1a0282010-06-04 23:28:52 +00003142 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S);
John McCalla93c9342009-12-07 02:54:59 +00003143 assert(TInfo && "couldn't build declarator info for anonymous struct/union");
John McCalleb692e02009-10-22 23:31:08 +00003144
Mike Stump1eb44332009-09-09 15:08:12 +00003145 // Create a declaration for this anonymous struct/union.
Douglas Gregor4afa39d2009-01-20 01:17:11 +00003146 NamedDecl *Anon = 0;
Douglas Gregorbcbffc42009-01-07 00:43:41 +00003147 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) {
Abramo Bagnaraff676cb2011-03-08 08:55:46 +00003148 Anon = FieldDecl::Create(Context, OwningClass,
Daniel Dunbar96a00142012-03-09 18:35:03 +00003149 DS.getLocStart(),
Abramo Bagnaraff676cb2011-03-08 08:55:46 +00003150 Record->getLocation(),
Mike Stump1eb44332009-09-09 15:08:12 +00003151 /*IdentifierInfo=*/0,
Argyrios Kyrtzidisa5d82002009-08-21 00:31:54 +00003152 Context.getTypeDeclType(Record),
John McCalla93c9342009-12-07 02:54:59 +00003153 TInfo,
Richard Smith7a614d82011-06-11 17:19:42 +00003154 /*BitWidth=*/0, /*Mutable=*/false,
Richard Smithca523302012-06-10 03:12:00 +00003155 /*InitStyle=*/ICIS_NoInit);
John McCallaec03712010-05-21 20:45:30 +00003156 Anon->setAccess(AS);
David Blaikie4e4d0842012-03-11 07:00:24 +00003157 if (getLangOpts().CPlusPlus)
Douglas Gregor6b3945f2009-01-07 19:46:03 +00003158 FieldCollector->Add(cast<FieldDecl>(Anon));
Douglas Gregorbcbffc42009-01-07 00:43:41 +00003159 } else {
Douglas Gregor16573fa2010-04-19 22:54:31 +00003160 DeclSpec::SCS SCSpec = DS.getStorageClassSpec();
3161 assert(SCSpec != DeclSpec::SCS_typedef &&
3162 "Parser allowed 'typedef' as storage class VarDecl.");
Abramo Bagnara35f9a192010-07-30 16:47:02 +00003163 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec);
Douglas Gregor16573fa2010-04-19 22:54:31 +00003164 if (SCSpec == DeclSpec::SCS_mutable) {
Douglas Gregorbcbffc42009-01-07 00:43:41 +00003165 // mutable can only appear on non-static class members, so it's always
3166 // an error here
3167 Diag(Record->getLocation(), diag::err_mutable_nonmember);
3168 Invalid = true;
John McCalld931b082010-08-26 03:08:43 +00003169 SC = SC_None;
Douglas Gregorbcbffc42009-01-07 00:43:41 +00003170 }
Douglas Gregor16573fa2010-04-19 22:54:31 +00003171 SCSpec = DS.getStorageClassSpecAsWritten();
3172 VarDecl::StorageClass SCAsWritten
Abramo Bagnara35f9a192010-07-30 16:47:02 +00003173 = StorageClassSpecToVarDeclStorageClass(SCSpec);
Douglas Gregorbcbffc42009-01-07 00:43:41 +00003174
Abramo Bagnaraff676cb2011-03-08 08:55:46 +00003175 Anon = VarDecl::Create(Context, Owner,
Daniel Dunbar96a00142012-03-09 18:35:03 +00003176 DS.getLocStart(),
Abramo Bagnaraff676cb2011-03-08 08:55:46 +00003177 Record->getLocation(), /*IdentifierInfo=*/0,
Argyrios Kyrtzidisa5d82002009-08-21 00:31:54 +00003178 Context.getTypeDeclType(Record),
Douglas Gregor16573fa2010-04-19 22:54:31 +00003179 TInfo, SC, SCAsWritten);
Richard Smith16ee8192011-09-18 00:06:34 +00003180
3181 // Default-initialize the implicit variable. This initialization will be
3182 // trivial in almost all cases, except if a union member has an in-class
3183 // initializer:
3184 // union { int n = 0; };
3185 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false);
Douglas Gregorbcbffc42009-01-07 00:43:41 +00003186 }
Douglas Gregor6b3945f2009-01-07 19:46:03 +00003187 Anon->setImplicit();
Douglas Gregorbcbffc42009-01-07 00:43:41 +00003188
3189 // Add the anonymous struct/union object to the current
3190 // context. We'll be referencing this object when we refer to one of
3191 // its members.
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00003192 Owner->addDecl(Anon);
Douglas Gregorfe60f842010-05-03 15:18:25 +00003193
Douglas Gregorbcbffc42009-01-07 00:43:41 +00003194 // Inject the members of the anonymous struct/union into the owning
3195 // context and into the identifier resolver chain for name lookup
3196 // purposes.
Chris Lattner5f9e2722011-07-23 10:55:15 +00003197 SmallVector<NamedDecl*, 2> Chain;
Francois Pichet87c2e122010-11-21 06:08:52 +00003198 Chain.push_back(Anon);
3199
Francois Pichet8e161ed2010-11-23 06:07:27 +00003200 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS,
3201 Chain, false))
Douglas Gregor4920f1f2009-01-12 22:49:06 +00003202 Invalid = true;
Douglas Gregorbcbffc42009-01-07 00:43:41 +00003203
3204 // Mark this as an anonymous struct/union type. Note that we do not
3205 // do this until after we have already checked and injected the
3206 // members of this anonymous struct/union type, because otherwise
3207 // the members could be injected twice: once by DeclContext when it
3208 // builds its lookup table, and once by
Mike Stump1eb44332009-09-09 15:08:12 +00003209 // InjectAnonymousStructOrUnionMembers.
Douglas Gregorbcbffc42009-01-07 00:43:41 +00003210 Record->setAnonymousStructOrUnion(true);
3211
3212 if (Invalid)
3213 Anon->setInvalidDecl();
3214
John McCalld226f652010-08-21 09:40:31 +00003215 return Anon;
Reid Spencer5f016e22007-07-11 17:01:13 +00003216}
3217
Francois Pichet8e161ed2010-11-23 06:07:27 +00003218/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an
3219/// Microsoft C anonymous structure.
3220/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx
3221/// Example:
3222///
3223/// struct A { int a; };
3224/// struct B { struct A; int b; };
3225///
3226/// void foo() {
3227/// B var;
3228/// var.a = 3;
3229/// }
3230///
3231Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS,
3232 RecordDecl *Record) {
3233
3234 // If there is no Record, get the record via the typedef.
3235 if (!Record)
3236 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl();
3237
3238 // Mock up a declarator.
3239 Declarator Dc(DS, Declarator::TypeNameContext);
3240 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S);
3241 assert(TInfo && "couldn't build declarator info for anonymous struct");
3242
3243 // Create a declaration for this anonymous struct.
3244 NamedDecl* Anon = FieldDecl::Create(Context,
3245 cast<RecordDecl>(CurContext),
Daniel Dunbar96a00142012-03-09 18:35:03 +00003246 DS.getLocStart(),
3247 DS.getLocStart(),
Francois Pichet8e161ed2010-11-23 06:07:27 +00003248 /*IdentifierInfo=*/0,
3249 Context.getTypeDeclType(Record),
3250 TInfo,
Richard Smith7a614d82011-06-11 17:19:42 +00003251 /*BitWidth=*/0, /*Mutable=*/false,
Richard Smithca523302012-06-10 03:12:00 +00003252 /*InitStyle=*/ICIS_NoInit);
Francois Pichet8e161ed2010-11-23 06:07:27 +00003253 Anon->setImplicit();
3254
3255 // Add the anonymous struct object to the current context.
3256 CurContext->addDecl(Anon);
3257
3258 // Inject the members of the anonymous struct into the current
3259 // context and into the identifier resolver chain for name lookup
3260 // purposes.
Chris Lattner5f9e2722011-07-23 10:55:15 +00003261 SmallVector<NamedDecl*, 2> Chain;
Francois Pichet8e161ed2010-11-23 06:07:27 +00003262 Chain.push_back(Anon);
3263
Nico Weberee625af2012-02-01 00:41:00 +00003264 RecordDecl *RecordDef = Record->getDefinition();
3265 if (!RecordDef || InjectAnonymousStructOrUnionMembers(*this, S, CurContext,
3266 RecordDef, AS_none,
3267 Chain, true))
Francois Pichet8e161ed2010-11-23 06:07:27 +00003268 Anon->setInvalidDecl();
3269
3270 return Anon;
3271}
Steve Narofff0090632007-09-02 02:04:30 +00003272
Douglas Gregor10bd3682008-11-17 22:58:34 +00003273/// GetNameForDeclarator - Determine the full declaration name for the
3274/// given Declarator.
Abramo Bagnara25777432010-08-11 22:01:17 +00003275DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) {
Douglas Gregor02a24ee2009-11-03 16:56:39 +00003276 return GetNameFromUnqualifiedId(D.getName());
3277}
3278
Abramo Bagnara25777432010-08-11 22:01:17 +00003279/// \brief Retrieves the declaration name from a parsed unqualified-id.
3280DeclarationNameInfo
3281Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) {
3282 DeclarationNameInfo NameInfo;
3283 NameInfo.setLoc(Name.StartLocation);
3284
Douglas Gregor3f9a0562009-11-03 01:35:08 +00003285 switch (Name.getKind()) {
Sean Hunt0486d742009-11-28 04:44:28 +00003286
Fariborz Jahanian98a54032011-07-12 17:16:56 +00003287 case UnqualifiedId::IK_ImplicitSelfParam:
Abramo Bagnara25777432010-08-11 22:01:17 +00003288 case UnqualifiedId::IK_Identifier:
3289 NameInfo.setName(Name.Identifier);
3290 NameInfo.setLoc(Name.StartLocation);
3291 return NameInfo;
Sean Hunt0486d742009-11-28 04:44:28 +00003292
Abramo Bagnara25777432010-08-11 22:01:17 +00003293 case UnqualifiedId::IK_OperatorFunctionId:
3294 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName(
3295 Name.OperatorFunctionId.Operator));
3296 NameInfo.setLoc(Name.StartLocation);
3297 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc
3298 = Name.OperatorFunctionId.SymbolLocations[0];
3299 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc
3300 = Name.EndLocation.getRawEncoding();
3301 return NameInfo;
Douglas Gregor0efc2c12010-01-13 17:31:36 +00003302
Abramo Bagnara25777432010-08-11 22:01:17 +00003303 case UnqualifiedId::IK_LiteralOperatorId:
3304 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName(
3305 Name.Identifier));
3306 NameInfo.setLoc(Name.StartLocation);
3307 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation);
3308 return NameInfo;
Douglas Gregor0efc2c12010-01-13 17:31:36 +00003309
Abramo Bagnara25777432010-08-11 22:01:17 +00003310 case UnqualifiedId::IK_ConversionFunctionId: {
3311 TypeSourceInfo *TInfo;
3312 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo);
3313 if (Ty.isNull())
3314 return DeclarationNameInfo();
3315 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName(
3316 Context.getCanonicalType(Ty)));
3317 NameInfo.setLoc(Name.StartLocation);
3318 NameInfo.setNamedTypeInfo(TInfo);
3319 return NameInfo;
Douglas Gregordb422df2009-09-25 21:45:23 +00003320 }
Abramo Bagnara25777432010-08-11 22:01:17 +00003321
3322 case UnqualifiedId::IK_ConstructorName: {
3323 TypeSourceInfo *TInfo;
3324 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo);
3325 if (Ty.isNull())
3326 return DeclarationNameInfo();
3327 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName(
3328 Context.getCanonicalType(Ty)));
3329 NameInfo.setLoc(Name.StartLocation);
3330 NameInfo.setNamedTypeInfo(TInfo);
3331 return NameInfo;
3332 }
3333
3334 case UnqualifiedId::IK_ConstructorTemplateId: {
3335 // In well-formed code, we can only have a constructor
3336 // template-id that refers to the current context, so go there
3337 // to find the actual type being constructed.
3338 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext);
3339 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name)
3340 return DeclarationNameInfo();
3341
3342 // Determine the type of the class being constructed.
3343 QualType CurClassType = Context.getTypeDeclType(CurClass);
3344
3345 // FIXME: Check two things: that the template-id names the same type as
3346 // CurClassType, and that the template-id does not occur when the name
3347 // was qualified.
3348
3349 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName(
3350 Context.getCanonicalType(CurClassType)));
3351 NameInfo.setLoc(Name.StartLocation);
3352 // FIXME: should we retrieve TypeSourceInfo?
3353 NameInfo.setNamedTypeInfo(0);
3354 return NameInfo;
3355 }
3356
3357 case UnqualifiedId::IK_DestructorName: {
3358 TypeSourceInfo *TInfo;
3359 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo);
3360 if (Ty.isNull())
3361 return DeclarationNameInfo();
3362 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName(
3363 Context.getCanonicalType(Ty)));
3364 NameInfo.setLoc(Name.StartLocation);
3365 NameInfo.setNamedTypeInfo(TInfo);
3366 return NameInfo;
3367 }
3368
3369 case UnqualifiedId::IK_TemplateId: {
John McCall2b5289b2010-08-23 07:28:44 +00003370 TemplateName TName = Name.TemplateId->Template.get();
Abramo Bagnara25777432010-08-11 22:01:17 +00003371 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc;
3372 return Context.getNameForTemplate(TName, TNameLoc);
3373 }
3374
3375 } // switch (Name.getKind())
3376
David Blaikieb219cfc2011-09-23 05:06:16 +00003377 llvm_unreachable("Unknown name kind");
Douglas Gregor10bd3682008-11-17 22:58:34 +00003378}
3379
Kaelyn Uhrain4d9d1572011-08-04 17:40:00 +00003380static QualType getCoreType(QualType Ty) {
3381 do {
3382 if (Ty->isPointerType() || Ty->isReferenceType())
3383 Ty = Ty->getPointeeType();
3384 else if (Ty->isArrayType())
3385 Ty = Ty->castAsArrayTypeUnsafe()->getElementType();
3386 else
3387 return Ty.withoutLocalFastQualifiers();
3388 } while (true);
3389}
3390
Kaelyn Uhrain2afd7662011-10-11 00:28:39 +00003391/// hasSimilarParameters - Determine whether the C++ functions Declaration
3392/// and Definition have "nearly" matching parameters. This heuristic is
3393/// used to improve diagnostics in the case where an out-of-line function
3394/// definition doesn't match any declaration within the class or namespace.
3395/// Also sets Params to the list of indices to the parameters that differ
3396/// between the declaration and the definition. If hasSimilarParameters
3397/// returns true and Params is empty, then all of the parameters match.
3398static bool hasSimilarParameters(ASTContext &Context,
Douglas Gregor4ce205f2009-02-06 17:46:57 +00003399 FunctionDecl *Declaration,
Kaelyn Uhrain4d9d1572011-08-04 17:40:00 +00003400 FunctionDecl *Definition,
3401 llvm::SmallVectorImpl<unsigned> &Params) {
3402 Params.clear();
Douglas Gregor584049d2008-12-15 23:53:10 +00003403 if (Declaration->param_size() != Definition->param_size())
3404 return false;
3405 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) {
3406 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType();
3407 QualType DefParamTy = Definition->getParamDecl(Idx)->getType();
3408
Kaelyn Uhrain4d9d1572011-08-04 17:40:00 +00003409 // The parameter types are identical
Matt Beaumont-Gay903d6dc2011-08-23 01:35:51 +00003410 if (Context.hasSameType(DefParamTy, DeclParamTy))
Kaelyn Uhrain4d9d1572011-08-04 17:40:00 +00003411 continue;
3412
3413 QualType DeclParamBaseTy = getCoreType(DeclParamTy);
3414 QualType DefParamBaseTy = getCoreType(DefParamTy);
3415 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier();
3416 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier();
3417
3418 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) ||
3419 (DeclTyName && DeclTyName == DefTyName))
3420 Params.push_back(Idx);
3421 else // The two parameters aren't even close
Douglas Gregor584049d2008-12-15 23:53:10 +00003422 return false;
3423 }
3424
3425 return true;
3426}
3427
John McCall63b43852010-04-29 23:50:39 +00003428/// NeedsRebuildingInCurrentInstantiation - Checks whether the given
3429/// declarator needs to be rebuilt in the current instantiation.
3430/// Any bits of declarator which appear before the name are valid for
3431/// consideration here. That's specifically the type in the decl spec
3432/// and the base type in any member-pointer chunks.
3433static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D,
3434 DeclarationName Name) {
3435 // The types we specifically need to rebuild are:
3436 // - typenames, typeofs, and decltypes
3437 // - types which will become injected class names
3438 // Of course, we also need to rebuild any type referencing such a
3439 // type. It's safest to just say "dependent", but we call out a
3440 // few cases here.
3441
3442 DeclSpec &DS = D.getMutableDeclSpec();
3443 switch (DS.getTypeSpecType()) {
3444 case DeclSpec::TST_typename:
3445 case DeclSpec::TST_typeofType:
Eli Friedmanb001de72011-10-06 23:00:33 +00003446 case DeclSpec::TST_underlyingType:
3447 case DeclSpec::TST_atomic: {
John McCall63b43852010-04-29 23:50:39 +00003448 // Grab the type from the parser.
3449 TypeSourceInfo *TSI = 0;
John McCallb3d87482010-08-24 05:47:05 +00003450 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI);
John McCall63b43852010-04-29 23:50:39 +00003451 if (T.isNull() || !T->isDependentType()) break;
3452
3453 // Make sure there's a type source info. This isn't really much
3454 // of a waste; most dependent types should have type source info
3455 // attached already.
3456 if (!TSI)
3457 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc());
3458
3459 // Rebuild the type in the current instantiation.
3460 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name);
3461 if (!TSI) return true;
3462
3463 // Store the new type back in the decl spec.
John McCallb3d87482010-08-24 05:47:05 +00003464 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI);
3465 DS.UpdateTypeRep(LocType);
3466 break;
3467 }
3468
Richard Smithc4a83912012-10-01 20:35:07 +00003469 case DeclSpec::TST_decltype:
John McCallb3d87482010-08-24 05:47:05 +00003470 case DeclSpec::TST_typeofExpr: {
3471 Expr *E = DS.getRepAsExpr();
John McCall60d7b3a2010-08-24 06:29:42 +00003472 ExprResult Result = S.RebuildExprInCurrentInstantiation(E);
John McCallb3d87482010-08-24 05:47:05 +00003473 if (Result.isInvalid()) return true;
3474 DS.UpdateExprRep(Result.get());
John McCall63b43852010-04-29 23:50:39 +00003475 break;
3476 }
3477
3478 default:
3479 // Nothing to do for these decl specs.
3480 break;
3481 }
3482
3483 // It doesn't matter what order we do this in.
3484 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) {
3485 DeclaratorChunk &Chunk = D.getTypeObject(I);
3486
3487 // The only type information in the declarator which can come
3488 // before the declaration name is the base type of a member
3489 // pointer.
3490 if (Chunk.Kind != DeclaratorChunk::MemberPointer)
3491 continue;
3492
3493 // Rebuild the scope specifier in-place.
3494 CXXScopeSpec &SS = Chunk.Mem.Scope();
3495 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS))
3496 return true;
3497 }
3498
3499 return false;
3500}
3501
Anders Carlsson3242ee02011-07-04 16:28:17 +00003502Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) {
Douglas Gregor45fa5602011-11-07 20:56:01 +00003503 D.setFunctionDefinitionKind(FDK_Declaration);
Benjamin Kramer5354e772012-08-23 23:38:35 +00003504 Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg());
Argyrios Kyrtzidisc14a03d2011-11-23 20:27:36 +00003505
3506 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() &&
Douglas Gregore7be1092012-04-30 18:13:01 +00003507 Dcl && Dcl->getDeclContext()->isFileContext())
Argyrios Kyrtzidisc14a03d2011-11-23 20:27:36 +00003508 Dcl->setTopLevelDeclInObjCContainer();
3509
3510 return Dcl;
John McCall7cd088e2010-08-24 07:21:54 +00003511}
3512
Richard Smith162e1c12011-04-15 14:24:37 +00003513/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13:
3514/// If T is the name of a class, then each of the following shall have a
3515/// name different from T:
3516/// - every static data member of class T;
3517/// - every member function of class T
3518/// - every member of class T that is itself a type;
3519/// \returns true if the declaration name violates these rules.
3520bool Sema::DiagnoseClassNameShadow(DeclContext *DC,
3521 DeclarationNameInfo NameInfo) {
3522 DeclarationName Name = NameInfo.getName();
3523
3524 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC))
3525 if (Record->getIdentifier() && Record->getDeclName() == Name) {
3526 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name;
3527 return true;
3528 }
3529
3530 return false;
3531}
Douglas Gregor42acead2012-03-17 23:06:31 +00003532
Douglas Gregor69605872012-03-28 16:01:27 +00003533/// \brief Diagnose a declaration whose declarator-id has the given
3534/// nested-name-specifier.
3535///
3536/// \param SS The nested-name-specifier of the declarator-id.
3537///
3538/// \param DC The declaration context to which the nested-name-specifier
3539/// resolves.
3540///
3541/// \param Name The name of the entity being declared.
3542///
3543/// \param Loc The location of the name of the entity being declared.
Douglas Gregor42acead2012-03-17 23:06:31 +00003544///
3545/// \returns true if we cannot safely recover from this error, false otherwise.
Douglas Gregor69605872012-03-28 16:01:27 +00003546bool Sema::diagnoseQualifiedDeclaration(CXXScopeSpec &SS, DeclContext *DC,
Douglas Gregor42acead2012-03-17 23:06:31 +00003547 DeclarationName Name,
Douglas Gregor69605872012-03-28 16:01:27 +00003548 SourceLocation Loc) {
3549 DeclContext *Cur = CurContext;
3550 while (isa<LinkageSpecDecl>(Cur))
3551 Cur = Cur->getParent();
3552
3553 // C++ [dcl.meaning]p1:
3554 // A declarator-id shall not be qualified except for the definition
3555 // of a member function (9.3) or static data member (9.4) outside of
3556 // its class, the definition or explicit instantiation of a function
3557 // or variable member of a namespace outside of its namespace, or the
3558 // definition of an explicit specialization outside of its namespace,
3559 // or the declaration of a friend function that is a member of
3560 // another class or namespace (11.3). [...]
3561
3562 // The user provided a superfluous scope specifier that refers back to the
3563 // class or namespaces in which the entity is already declared.
Douglas Gregor42acead2012-03-17 23:06:31 +00003564 //
3565 // class X {
3566 // void X::f();
3567 // };
Douglas Gregor69605872012-03-28 16:01:27 +00003568 if (Cur->Equals(DC)) {
Douglas Gregor75379452012-09-13 20:16:20 +00003569 Diag(Loc, LangOpts.MicrosoftExt? diag::warn_member_extra_qualification
3570 : diag::err_member_extra_qualification)
Douglas Gregor42acead2012-03-17 23:06:31 +00003571 << Name << FixItHint::CreateRemoval(SS.getRange());
3572 SS.clear();
3573 return false;
3574 }
Douglas Gregor69605872012-03-28 16:01:27 +00003575
3576 // Check whether the qualifying scope encloses the scope of the original
3577 // declaration.
3578 if (!Cur->Encloses(DC)) {
3579 if (Cur->isRecord())
3580 Diag(Loc, diag::err_member_qualification)
3581 << Name << SS.getRange();
3582 else if (isa<TranslationUnitDecl>(DC))
3583 Diag(Loc, diag::err_invalid_declarator_global_scope)
3584 << Name << SS.getRange();
3585 else if (isa<FunctionDecl>(Cur))
3586 Diag(Loc, diag::err_invalid_declarator_in_function)
3587 << Name << SS.getRange();
3588 else
3589 Diag(Loc, diag::err_invalid_declarator_scope)
Richard Smitha1c4f7c2012-04-13 04:07:40 +00003590 << Name << cast<NamedDecl>(Cur) << cast<NamedDecl>(DC) << SS.getRange();
Douglas Gregor69605872012-03-28 16:01:27 +00003591
Douglas Gregor42acead2012-03-17 23:06:31 +00003592 return true;
Douglas Gregor69605872012-03-28 16:01:27 +00003593 }
3594
3595 if (Cur->isRecord()) {
3596 // Cannot qualify members within a class.
3597 Diag(Loc, diag::err_member_qualification)
3598 << Name << SS.getRange();
3599 SS.clear();
3600
3601 // C++ constructors and destructors with incorrect scopes can break
3602 // our AST invariants by having the wrong underlying types. If
3603 // that's the case, then drop this declaration entirely.
3604 if ((Name.getNameKind() == DeclarationName::CXXConstructorName ||
3605 Name.getNameKind() == DeclarationName::CXXDestructorName) &&
3606 !Context.hasSameType(Name.getCXXNameType(),
3607 Context.getTypeDeclType(cast<CXXRecordDecl>(Cur))))
3608 return true;
3609
3610 return false;
3611 }
Douglas Gregor42acead2012-03-17 23:06:31 +00003612
Douglas Gregor69605872012-03-28 16:01:27 +00003613 // C++11 [dcl.meaning]p1:
3614 // [...] "The nested-name-specifier of the qualified declarator-id shall
3615 // not begin with a decltype-specifer"
3616 NestedNameSpecifierLoc SpecLoc(SS.getScopeRep(), SS.location_data());
3617 while (SpecLoc.getPrefix())
3618 SpecLoc = SpecLoc.getPrefix();
3619 if (dyn_cast_or_null<DecltypeType>(
3620 SpecLoc.getNestedNameSpecifier()->getAsType()))
3621 Diag(Loc, diag::err_decltype_in_declarator)
3622 << SpecLoc.getTypeLoc().getSourceRange();
3623
Douglas Gregor42acead2012-03-17 23:06:31 +00003624 return false;
3625}
3626
John McCalld226f652010-08-21 09:40:31 +00003627Decl *Sema::HandleDeclarator(Scope *S, Declarator &D,
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00003628 MultiTemplateParamsArg TemplateParamLists) {
Abramo Bagnara25777432010-08-11 22:01:17 +00003629 // TODO: consider using NameInfo for diagnostic.
3630 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
3631 DeclarationName Name = NameInfo.getName();
Douglas Gregor10bd3682008-11-17 22:58:34 +00003632
Chris Lattnere80a59c2007-07-25 00:24:17 +00003633 // All of these full declarators require an identifier. If it doesn't have
3634 // one, the ParsedFreeStandingDeclSpec action should be used.
Douglas Gregor10bd3682008-11-17 22:58:34 +00003635 if (!Name) {
Chris Lattnereaaebc72009-04-25 08:06:05 +00003636 if (!D.isInvalidType()) // Reject this if we think it is valid.
Daniel Dunbar96a00142012-03-09 18:35:03 +00003637 Diag(D.getDeclSpec().getLocStart(),
Chris Lattnerfa25bbb2008-11-19 05:08:23 +00003638 diag::err_declarator_need_ident)
3639 << D.getDeclSpec().getSourceRange() << D.getSourceRange();
John McCalld226f652010-08-21 09:40:31 +00003640 return 0;
Douglas Gregor56c04582010-12-16 00:46:58 +00003641 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType))
3642 return 0;
Mike Stump1eb44332009-09-09 15:08:12 +00003643
Chris Lattner31e05722007-08-26 06:24:45 +00003644 // The scope passed in may not be a decl scope. Zip up the scope tree until
3645 // we find one that is.
Douglas Gregor44b43212008-12-11 16:49:14 +00003646 while ((S->getFlags() & Scope::DeclScope) == 0 ||
Douglas Gregoraaba5e32009-02-04 19:02:06 +00003647 (S->getFlags() & Scope::TemplateParamScope) != 0)
Chris Lattner31e05722007-08-26 06:24:45 +00003648 S = S->getParent();
Mike Stump1eb44332009-09-09 15:08:12 +00003649
John McCall63b43852010-04-29 23:50:39 +00003650 DeclContext *DC = CurContext;
3651 if (D.getCXXScopeSpec().isInvalid())
3652 D.setInvalidType();
3653 else if (D.getCXXScopeSpec().isSet()) {
Douglas Gregor6ccab972010-12-16 01:14:37 +00003654 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(),
3655 UPPC_DeclarationQualifier))
3656 return 0;
3657
John McCall63b43852010-04-29 23:50:39 +00003658 bool EnteringContext = !D.getDeclSpec().isFriendSpecified();
3659 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext);
3660 if (!DC) {
3661 // If we could not compute the declaration context, it's because the
3662 // declaration context is dependent but does not refer to a class,
3663 // class template, or class template partial specialization. Complain
3664 // and return early, to avoid the coming semantic disaster.
3665 Diag(D.getIdentifierLoc(),
3666 diag::err_template_qualified_declarator_no_match)
3667 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep()
3668 << D.getCXXScopeSpec().getRange();
John McCalld226f652010-08-21 09:40:31 +00003669 return 0;
John McCall63b43852010-04-29 23:50:39 +00003670 }
John McCall63b43852010-04-29 23:50:39 +00003671 bool IsDependentContext = DC->isDependentContext();
John McCall0dd7ceb2009-12-19 09:35:56 +00003672
John McCall63b43852010-04-29 23:50:39 +00003673 if (!IsDependentContext &&
John McCall77bb1aa2010-05-01 00:40:08 +00003674 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC))
John McCalld226f652010-08-21 09:40:31 +00003675 return 0;
John McCall63b43852010-04-29 23:50:39 +00003676
Douglas Gregor69605872012-03-28 16:01:27 +00003677 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) {
3678 Diag(D.getIdentifierLoc(),
3679 diag::err_member_def_undefined_record)
3680 << Name << DC << D.getCXXScopeSpec().getRange();
3681 D.setInvalidType();
3682 } else if (!D.getDeclSpec().isFriendSpecified()) {
3683 if (diagnoseQualifiedDeclaration(D.getCXXScopeSpec(), DC,
3684 Name, D.getIdentifierLoc())) {
3685 if (DC->isRecord())
Douglas Gregor42acead2012-03-17 23:06:31 +00003686 return 0;
Douglas Gregor69605872012-03-28 16:01:27 +00003687
3688 D.setInvalidType();
Douglas Gregor922fff22010-10-13 22:19:53 +00003689 }
John McCall63b43852010-04-29 23:50:39 +00003690 }
3691
3692 // Check whether we need to rebuild the type of the given
3693 // declaration in the current instantiation.
3694 if (EnteringContext && IsDependentContext &&
3695 TemplateParamLists.size() != 0) {
3696 ContextRAII SavedContext(*this, DC);
3697 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name))
3698 D.setInvalidType();
Douglas Gregor4a959d82009-08-06 16:20:37 +00003699 }
3700 }
Richard Smith162e1c12011-04-15 14:24:37 +00003701
3702 if (DiagnoseClassNameShadow(DC, NameInfo))
3703 // If this is a typedef, we'll end up spewing multiple diagnostics.
3704 // Just return early; it's safer.
3705 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
3706 return 0;
Douglas Gregora6e937c2010-10-15 13:21:21 +00003707
John McCallbf1a0282010-06-04 23:28:52 +00003708 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
3709 QualType R = TInfo->getType();
Douglas Gregord6f7e9d2009-02-24 20:03:32 +00003710
Douglas Gregord0937222010-12-13 22:49:22 +00003711 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
3712 UPPC_DeclarationType))
3713 D.setInvalidType();
3714
Abramo Bagnara25777432010-08-11 22:01:17 +00003715 LookupResult Previous(*this, NameInfo, LookupOrdinaryName,
John McCall68263142009-11-18 22:49:29 +00003716 ForRedeclaration);
3717
Argyrios Kyrtzidisef6e6472008-11-08 17:17:31 +00003718 // See if this is a redefinition of a variable in the same scope.
John McCall63b43852010-04-29 23:50:39 +00003719 if (!D.getCXXScopeSpec().isSet()) {
John McCall68263142009-11-18 22:49:29 +00003720 bool IsLinkageLookup = false;
Douglas Gregord6f7e9d2009-02-24 20:03:32 +00003721
3722 // If the declaration we're planning to build will be a function
3723 // or object with linkage, then look for another declaration with
3724 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6).
3725 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
3726 /* Do nothing*/;
3727 else if (R->isFunctionType()) {
Douglas Gregor6bec78d2009-07-07 17:00:05 +00003728 if (CurContext->isFunctionOrMethod() ||
3729 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static)
John McCall68263142009-11-18 22:49:29 +00003730 IsLinkageLookup = true;
Douglas Gregord6f7e9d2009-02-24 20:03:32 +00003731 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern)
John McCall68263142009-11-18 22:49:29 +00003732 IsLinkageLookup = true;
Sebastian Redl7a126a42010-08-31 00:36:30 +00003733 else if (CurContext->getRedeclContext()->isTranslationUnit() &&
Douglas Gregor6bec78d2009-07-07 17:00:05 +00003734 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static)
John McCall68263142009-11-18 22:49:29 +00003735 IsLinkageLookup = true;
3736
3737 if (IsLinkageLookup)
3738 Previous.clear(LookupRedeclarationWithLinkage);
Douglas Gregord6f7e9d2009-02-24 20:03:32 +00003739
John McCall68263142009-11-18 22:49:29 +00003740 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup);
Argyrios Kyrtzidisef6e6472008-11-08 17:17:31 +00003741 } else { // Something like "int foo::x;"
John McCall68263142009-11-18 22:49:29 +00003742 LookupQualifiedName(Previous, DC);
3743
Douglas Gregor69605872012-03-28 16:01:27 +00003744 // C++ [dcl.meaning]p1:
3745 // When the declarator-id is qualified, the declaration shall refer to a
3746 // previously declared member of the class or namespace to which the
3747 // qualifier refers (or, in the case of a namespace, of an element of the
3748 // inline namespace set of that namespace (7.3.1)) or to a specialization
3749 // thereof; [...]
Argyrios Kyrtzidisef6e6472008-11-08 17:17:31 +00003750 //
Douglas Gregor69605872012-03-28 16:01:27 +00003751 // Note that we already checked the context above, and that we do not have
3752 // enough information to make sure that Previous contains the declaration
3753 // we want to match. For example, given:
Douglas Gregor584049d2008-12-15 23:53:10 +00003754 //
Douglas Gregor9d350972008-12-12 08:25:50 +00003755 // class X {
3756 // void f();
Douglas Gregor584049d2008-12-15 23:53:10 +00003757 // void f(float);
Douglas Gregor9d350972008-12-12 08:25:50 +00003758 // };
3759 //
Douglas Gregor584049d2008-12-15 23:53:10 +00003760 // void X::f(int) { } // ill-formed
3761 //
Douglas Gregor69605872012-03-28 16:01:27 +00003762 // In this case, Previous will point to the overload set
Douglas Gregor584049d2008-12-15 23:53:10 +00003763 // containing the two f's declared in X, but neither of them
Mike Stump1eb44332009-09-09 15:08:12 +00003764 // matches.
Douglas Gregor69605872012-03-28 16:01:27 +00003765
3766 // C++ [dcl.meaning]p1:
3767 // [...] the member shall not merely have been introduced by a
3768 // using-declaration in the scope of the class or namespace nominated by
3769 // the nested-name-specifier of the declarator-id.
3770 RemoveUsingDecls(Previous);
Argyrios Kyrtzidisef6e6472008-11-08 17:17:31 +00003771 }
3772
John McCall68263142009-11-18 22:49:29 +00003773 if (Previous.isSingleResult() &&
3774 Previous.getFoundDecl()->isTemplateParameter()) {
Douglas Gregor72c3f312008-12-05 18:15:24 +00003775 // Maybe we will complain about the shadowed template parameter.
Mike Stump1eb44332009-09-09 15:08:12 +00003776 if (!D.isInvalidType())
Douglas Gregorcb8f9512011-10-20 17:58:49 +00003777 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(),
3778 Previous.getFoundDecl());
Mike Stump1eb44332009-09-09 15:08:12 +00003779
Douglas Gregor72c3f312008-12-05 18:15:24 +00003780 // Just pretend that we didn't see the previous declaration.
John McCall68263142009-11-18 22:49:29 +00003781 Previous.clear();
Douglas Gregor72c3f312008-12-05 18:15:24 +00003782 }
3783
Douglas Gregor2ce52f32008-04-13 21:07:44 +00003784 // In C++, the previous declaration we find might be a tag type
3785 // (class or enum). In this case, the new declaration will hide the
Douglas Gregor66973122009-01-28 17:15:10 +00003786 // tag type. Note that this does does not apply if we're declaring a
3787 // typedef (C++ [dcl.typedef]p4).
John McCall68263142009-11-18 22:49:29 +00003788 if (Previous.isSingleTagDecl() &&
Douglas Gregor66973122009-01-28 17:15:10 +00003789 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef)
John McCall68263142009-11-18 22:49:29 +00003790 Previous.clear();
Douglas Gregor2ce52f32008-04-13 21:07:44 +00003791
Nico Webere6bb76c2012-12-23 00:40:46 +00003792 NamedDecl *New;
3793
Francois Pichetaf0f4d02011-08-14 03:52:19 +00003794 bool AddToScope = true;
Reid Spencer5f016e22007-07-11 17:01:13 +00003795 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) {
Douglas Gregore542c862009-06-23 23:11:28 +00003796 if (TemplateParamLists.size()) {
3797 Diag(D.getIdentifierLoc(), diag::err_template_typedef);
John McCalld226f652010-08-21 09:40:31 +00003798 return 0;
Douglas Gregore542c862009-06-23 23:11:28 +00003799 }
Mike Stump1eb44332009-09-09 15:08:12 +00003800
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00003801 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous);
Douglas Gregord6f7e9d2009-02-24 20:03:32 +00003802 } else if (R->isFunctionType()) {
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00003803 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous,
Benjamin Kramer3fe198b2012-08-23 21:35:17 +00003804 TemplateParamLists,
Francois Pichetaf0f4d02011-08-14 03:52:19 +00003805 AddToScope);
Reid Spencer5f016e22007-07-11 17:01:13 +00003806 } else {
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00003807 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous,
Benjamin Kramer3fe198b2012-08-23 21:35:17 +00003808 TemplateParamLists);
Reid Spencer5f016e22007-07-11 17:01:13 +00003809 }
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00003810
3811 if (New == 0)
John McCalld226f652010-08-21 09:40:31 +00003812 return 0;
Mike Stump1eb44332009-09-09 15:08:12 +00003813
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00003814 // If this has an identifier and is not an invalid redeclaration or
3815 // function template specialization, add it to the scope stack.
Francois Pichetaf0f4d02011-08-14 03:52:19 +00003816 if (New->getDeclName() && AddToScope &&
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00003817 !(D.isRedeclaration() && New->isInvalidDecl()))
Argyrios Kyrtzidis87f3ff02008-04-12 00:47:19 +00003818 PushOnScopeChains(New, S);
Mike Stump1eb44332009-09-09 15:08:12 +00003819
John McCalld226f652010-08-21 09:40:31 +00003820 return New;
Reid Spencer5f016e22007-07-11 17:01:13 +00003821}
3822
Abramo Bagnara88adb982012-11-08 16:27:30 +00003823/// Helper method to turn variable array types into constant array
3824/// types in certain situations which would otherwise be errors (for
3825/// GCC compatibility).
Eli Friedman1ca48132009-02-21 00:44:51 +00003826static QualType TryToFixInvalidVariablyModifiedType(QualType T,
3827 ASTContext &Context,
Douglas Gregor2767ce22010-08-18 00:39:00 +00003828 bool &SizeIsNegative,
3829 llvm::APSInt &Oversized) {
Eli Friedman1ca48132009-02-21 00:44:51 +00003830 // This method tries to turn a variable array into a constant
3831 // array even when the size isn't an ICE. This is necessary
3832 // for compatibility with code that depends on gcc's buggy
3833 // constant expression folding, like struct {char x[(int)(char*)2];}
3834 SizeIsNegative = false;
Douglas Gregor2767ce22010-08-18 00:39:00 +00003835 Oversized = 0;
3836
3837 if (T->isDependentType())
3838 return QualType();
3839
John McCall0953e762009-09-24 19:53:00 +00003840 QualifierCollector Qs;
3841 const Type *Ty = Qs.strip(T);
3842
3843 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) {
Eli Friedman1ca48132009-02-21 00:44:51 +00003844 QualType Pointee = PTy->getPointeeType();
3845 QualType FixedType =
Douglas Gregor2767ce22010-08-18 00:39:00 +00003846 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative,
3847 Oversized);
Eli Friedman1ca48132009-02-21 00:44:51 +00003848 if (FixedType.isNull()) return FixedType;
Eli Friedman61125c82009-02-21 00:58:02 +00003849 FixedType = Context.getPointerType(FixedType);
John McCall49f4e1c2010-12-10 11:01:00 +00003850 return Qs.apply(Context, FixedType);
Eli Friedman1ca48132009-02-21 00:44:51 +00003851 }
Abramo Bagnara075f8f12010-12-10 16:29:40 +00003852 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) {
3853 QualType Inner = PTy->getInnerType();
3854 QualType FixedType =
3855 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative,
3856 Oversized);
3857 if (FixedType.isNull()) return FixedType;
3858 FixedType = Context.getParenType(FixedType);
3859 return Qs.apply(Context, FixedType);
3860 }
Eli Friedman1ca48132009-02-21 00:44:51 +00003861
3862 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T);
Eli Friedmanbc592e62009-02-26 03:58:54 +00003863 if (!VLATy)
3864 return QualType();
3865 // FIXME: We should probably handle this case
3866 if (VLATy->getElementType()->isVariablyModifiedType())
3867 return QualType();
Mike Stump1eb44332009-09-09 15:08:12 +00003868
Richard Smithaa9c3502011-12-07 00:43:50 +00003869 llvm::APSInt Res;
Eli Friedman1ca48132009-02-21 00:44:51 +00003870 if (!VLATy->getSizeExpr() ||
Richard Smithaa9c3502011-12-07 00:43:50 +00003871 !VLATy->getSizeExpr()->EvaluateAsInt(Res, Context))
Eli Friedman1ca48132009-02-21 00:44:51 +00003872 return QualType();
Eli Friedmanbc592e62009-02-26 03:58:54 +00003873
Douglas Gregor2767ce22010-08-18 00:39:00 +00003874 // Check whether the array size is negative.
Douglas Gregor2767ce22010-08-18 00:39:00 +00003875 if (Res.isSigned() && Res.isNegative()) {
3876 SizeIsNegative = true;
3877 return QualType();
Douglas Gregor7e7eb3d2009-07-06 15:59:29 +00003878 }
Eli Friedman1ca48132009-02-21 00:44:51 +00003879
Douglas Gregor2767ce22010-08-18 00:39:00 +00003880 // Check whether the array is too large to be addressed.
3881 unsigned ActiveSizeBits
3882 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(),
3883 Res);
3884 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) {
3885 Oversized = Res;
3886 return QualType();
3887 }
3888
3889 return Context.getConstantArrayType(VLATy->getElementType(),
3890 Res, ArrayType::Normal, 0);
Eli Friedman1ca48132009-02-21 00:44:51 +00003891}
3892
Abramo Bagnara4c5750e2012-11-08 14:44:42 +00003893static void
3894FixInvalidVariablyModifiedTypeLoc(TypeLoc SrcTL, TypeLoc DstTL) {
3895 if (PointerTypeLoc* SrcPTL = dyn_cast<PointerTypeLoc>(&SrcTL)) {
3896 PointerTypeLoc* DstPTL = cast<PointerTypeLoc>(&DstTL);
3897 FixInvalidVariablyModifiedTypeLoc(SrcPTL->getPointeeLoc(),
3898 DstPTL->getPointeeLoc());
3899 DstPTL->setStarLoc(SrcPTL->getStarLoc());
3900 return;
3901 }
3902 if (ParenTypeLoc* SrcPTL = dyn_cast<ParenTypeLoc>(&SrcTL)) {
3903 ParenTypeLoc* DstPTL = cast<ParenTypeLoc>(&DstTL);
3904 FixInvalidVariablyModifiedTypeLoc(SrcPTL->getInnerLoc(),
3905 DstPTL->getInnerLoc());
3906 DstPTL->setLParenLoc(SrcPTL->getLParenLoc());
3907 DstPTL->setRParenLoc(SrcPTL->getRParenLoc());
3908 return;
3909 }
3910 ArrayTypeLoc* SrcATL = cast<ArrayTypeLoc>(&SrcTL);
3911 ArrayTypeLoc* DstATL = cast<ArrayTypeLoc>(&DstTL);
3912 TypeLoc SrcElemTL = SrcATL->getElementLoc();
3913 TypeLoc DstElemTL = DstATL->getElementLoc();
3914 DstElemTL.initializeFullCopy(SrcElemTL);
3915 DstATL->setLBracketLoc(SrcATL->getLBracketLoc());
3916 DstATL->setSizeExpr(SrcATL->getSizeExpr());
3917 DstATL->setRBracketLoc(SrcATL->getRBracketLoc());
3918}
3919
Abramo Bagnara88adb982012-11-08 16:27:30 +00003920/// Helper method to turn variable array types into constant array
3921/// types in certain situations which would otherwise be errors (for
3922/// GCC compatibility).
Abramo Bagnara4c5750e2012-11-08 14:44:42 +00003923static TypeSourceInfo*
3924TryToFixInvalidVariablyModifiedTypeSourceInfo(TypeSourceInfo *TInfo,
3925 ASTContext &Context,
3926 bool &SizeIsNegative,
3927 llvm::APSInt &Oversized) {
3928 QualType FixedTy
3929 = TryToFixInvalidVariablyModifiedType(TInfo->getType(), Context,
3930 SizeIsNegative, Oversized);
3931 if (FixedTy.isNull())
3932 return 0;
3933 TypeSourceInfo *FixedTInfo = Context.getTrivialTypeSourceInfo(FixedTy);
3934 FixInvalidVariablyModifiedTypeLoc(TInfo->getTypeLoc(),
3935 FixedTInfo->getTypeLoc());
3936 return FixedTInfo;
3937}
3938
Douglas Gregor63935192009-03-02 00:19:53 +00003939/// \brief Register the given locally-scoped external C declaration so
3940/// that it can be found later for redeclarations
Mike Stump1eb44332009-09-09 15:08:12 +00003941void
John McCall68263142009-11-18 22:49:29 +00003942Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND,
3943 const LookupResult &Previous,
Douglas Gregor63935192009-03-02 00:19:53 +00003944 Scope *S) {
3945 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() &&
3946 "Decl is not a locally-scoped decl!");
3947 // Note that we have a locally-scoped external with this name.
3948 LocallyScopedExternalDecls[ND->getDeclName()] = ND;
3949
John McCall68263142009-11-18 22:49:29 +00003950 if (!Previous.isSingleResult())
Douglas Gregor63935192009-03-02 00:19:53 +00003951 return;
3952
John McCall68263142009-11-18 22:49:29 +00003953 NamedDecl *PrevDecl = Previous.getFoundDecl();
3954
Douglas Gregor63935192009-03-02 00:19:53 +00003955 // If there was a previous declaration of this variable, it may be
3956 // in our identifier chain. Update the identifier chain with the new
3957 // declaration.
Douglas Gregor2dc0e642009-03-23 23:06:20 +00003958 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) {
Douglas Gregor63935192009-03-02 00:19:53 +00003959 // The previous declaration was found on the identifer resolver
3960 // chain, so remove it from its scope.
Douglas Gregore12a11f2011-06-29 21:22:02 +00003961
3962 if (S->isDeclScope(PrevDecl)) {
3963 // Special case for redeclarations in the SAME scope.
3964 // Because this declaration is going to be added to the identifier chain
3965 // later, we should temporarily take it OFF the chain.
3966 IdResolver.RemoveDecl(ND);
3967
3968 } else {
3969 // Find the scope for the original declaration.
3970 while (S && !S->isDeclScope(PrevDecl))
3971 S = S->getParent();
3972 }
Douglas Gregor63935192009-03-02 00:19:53 +00003973
3974 if (S)
John McCalld226f652010-08-21 09:40:31 +00003975 S->RemoveDecl(PrevDecl);
Douglas Gregor63935192009-03-02 00:19:53 +00003976 }
3977}
3978
Douglas Gregorec12ce22011-07-28 14:20:37 +00003979llvm::DenseMap<DeclarationName, NamedDecl *>::iterator
3980Sema::findLocallyScopedExternalDecl(DeclarationName Name) {
3981 if (ExternalSource) {
3982 // Load locally-scoped external decls from the external source.
3983 SmallVector<NamedDecl *, 4> Decls;
3984 ExternalSource->ReadLocallyScopedExternalDecls(Decls);
3985 for (unsigned I = 0, N = Decls.size(); I != N; ++I) {
3986 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
3987 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName());
3988 if (Pos == LocallyScopedExternalDecls.end())
3989 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I];
3990 }
3991 }
3992
3993 return LocallyScopedExternalDecls.find(Name);
3994}
3995
Eli Friedman85a53192009-04-07 19:37:57 +00003996/// \brief Diagnose function specifiers on a declaration of an identifier that
3997/// does not identify a function.
3998void Sema::DiagnoseFunctionSpecifiers(Declarator& D) {
3999 // FIXME: We should probably indicate the identifier in question to avoid
4000 // confusion for constructs like "inline int a(), b;"
4001 if (D.getDeclSpec().isInlineSpecified())
Mike Stump1eb44332009-09-09 15:08:12 +00004002 Diag(D.getDeclSpec().getInlineSpecLoc(),
Eli Friedman85a53192009-04-07 19:37:57 +00004003 diag::err_inline_non_function);
4004
4005 if (D.getDeclSpec().isVirtualSpecified())
Mike Stump1eb44332009-09-09 15:08:12 +00004006 Diag(D.getDeclSpec().getVirtualSpecLoc(),
Eli Friedman85a53192009-04-07 19:37:57 +00004007 diag::err_virtual_non_function);
4008
4009 if (D.getDeclSpec().isExplicitSpecified())
Mike Stump1eb44332009-09-09 15:08:12 +00004010 Diag(D.getDeclSpec().getExplicitSpecLoc(),
Eli Friedman85a53192009-04-07 19:37:57 +00004011 diag::err_explicit_non_function);
4012}
4013
Douglas Gregor4afa39d2009-01-20 01:17:11 +00004014NamedDecl*
Zhongxing Xud5ed8c32009-01-16 03:34:13 +00004015Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC,
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00004016 TypeSourceInfo *TInfo, LookupResult &Previous) {
Zhongxing Xud5ed8c32009-01-16 03:34:13 +00004017 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1).
4018 if (D.getCXXScopeSpec().isSet()) {
4019 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator)
4020 << D.getCXXScopeSpec().getRange();
Chris Lattnereaaebc72009-04-25 08:06:05 +00004021 D.setInvalidType();
Zhongxing Xud5ed8c32009-01-16 03:34:13 +00004022 // Pretend we didn't see the scope specifier.
Douglas Gregor9de672f2010-03-23 15:26:55 +00004023 DC = CurContext;
4024 Previous.clear();
Zhongxing Xud5ed8c32009-01-16 03:34:13 +00004025 }
4026
David Blaikie4e4d0842012-03-11 07:00:24 +00004027 if (getLangOpts().CPlusPlus) {
Douglas Gregor021c3b32009-03-11 23:00:04 +00004028 // Check that there are no default arguments (C++ only).
Zhongxing Xud5ed8c32009-01-16 03:34:13 +00004029 CheckExtraCXXDefaultArguments(D);
Douglas Gregor021c3b32009-03-11 23:00:04 +00004030 }
4031
Eli Friedman85a53192009-04-07 19:37:57 +00004032 DiagnoseFunctionSpecifiers(D);
4033
Eli Friedman63054b32009-04-19 20:27:55 +00004034 if (D.getDeclSpec().isThreadSpecified())
4035 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
Richard Smithaf1fc7a2011-08-15 21:04:07 +00004036 if (D.getDeclSpec().isConstexprSpecified())
4037 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr)
4038 << 1;
Eli Friedman63054b32009-04-19 20:27:55 +00004039
Douglas Gregoraef01992010-07-13 06:37:01 +00004040 if (D.getName().Kind != UnqualifiedId::IK_Identifier) {
4041 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier)
4042 << D.getName().getSourceRange();
4043 return 0;
4044 }
4045
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00004046 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo);
Zhongxing Xud5ed8c32009-01-16 03:34:13 +00004047 if (!NewTD) return 0;
Mike Stump1eb44332009-09-09 15:08:12 +00004048
Zhongxing Xud5ed8c32009-01-16 03:34:13 +00004049 // Handle attributes prior to checking for duplicates in MergeVarDecl
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00004050 ProcessDeclAttributes(S, NewTD, D);
John McCall68263142009-11-18 22:49:29 +00004051
Richard Smith3e4c6c42011-05-05 21:57:07 +00004052 CheckTypedefForVariablyModifiedType(S, NewTD);
4053
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00004054 bool Redeclaration = D.isRedeclaration();
4055 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration);
4056 D.setRedeclaration(Redeclaration);
4057 return ND;
Richard Smith162e1c12011-04-15 14:24:37 +00004058}
4059
Richard Smith3e4c6c42011-05-05 21:57:07 +00004060void
4061Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) {
Chris Lattner38c5ebd2009-04-19 05:21:20 +00004062 // C99 6.7.7p2: If a typedef name specifies a variably modified type
4063 // then it shall have block scope.
Eli Friedmanbf87f2c2010-08-10 03:13:15 +00004064 // Note that variably modified types must be fixed before merging the decl so
4065 // that redeclarations will match.
Abramo Bagnara4c5750e2012-11-08 14:44:42 +00004066 TypeSourceInfo *TInfo = NewTD->getTypeSourceInfo();
4067 QualType T = TInfo->getType();
Chris Lattner38c5ebd2009-04-19 05:21:20 +00004068 if (T->isVariablyModifiedType()) {
John McCall781472f2010-08-25 08:40:02 +00004069 getCurFunction()->setHasBranchProtectedScope();
Mike Stump1eb44332009-09-09 15:08:12 +00004070
Chris Lattner38c5ebd2009-04-19 05:21:20 +00004071 if (S->getFnParent() == 0) {
Eli Friedman1ca48132009-02-21 00:44:51 +00004072 bool SizeIsNegative;
Douglas Gregor2767ce22010-08-18 00:39:00 +00004073 llvm::APSInt Oversized;
Abramo Bagnara4c5750e2012-11-08 14:44:42 +00004074 TypeSourceInfo *FixedTInfo =
4075 TryToFixInvalidVariablyModifiedTypeSourceInfo(TInfo, Context,
4076 SizeIsNegative,
4077 Oversized);
4078 if (FixedTInfo) {
Richard Smith162e1c12011-04-15 14:24:37 +00004079 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size);
Abramo Bagnara4c5750e2012-11-08 14:44:42 +00004080 NewTD->setTypeSourceInfo(FixedTInfo);
Eli Friedman1ca48132009-02-21 00:44:51 +00004081 } else {
4082 if (SizeIsNegative)
Richard Smith162e1c12011-04-15 14:24:37 +00004083 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size);
Eli Friedman1ca48132009-02-21 00:44:51 +00004084 else if (T->isVariableArrayType())
Richard Smith162e1c12011-04-15 14:24:37 +00004085 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope);
Douglas Gregor2767ce22010-08-18 00:39:00 +00004086 else if (Oversized.getBoolValue())
David Blaikied662a792011-10-19 22:56:21 +00004087 Diag(NewTD->getLocation(), diag::err_array_too_large)
4088 << Oversized.toString(10);
Eli Friedman1ca48132009-02-21 00:44:51 +00004089 else
Richard Smith162e1c12011-04-15 14:24:37 +00004090 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope);
Chris Lattnereaaebc72009-04-25 08:06:05 +00004091 NewTD->setInvalidDecl();
Eli Friedman1ca48132009-02-21 00:44:51 +00004092 }
Zhongxing Xud5ed8c32009-01-16 03:34:13 +00004093 }
4094 }
Richard Smith3e4c6c42011-05-05 21:57:07 +00004095}
Douglas Gregorc29f77b2009-07-07 16:35:42 +00004096
Richard Smith3e4c6c42011-05-05 21:57:07 +00004097
4098/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which
4099/// declares a typedef-name, either using the 'typedef' type specifier or via
4100/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'.
4101NamedDecl*
4102Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD,
4103 LookupResult &Previous, bool &Redeclaration) {
Eli Friedmanbf87f2c2010-08-10 03:13:15 +00004104 // Merge the decl with the existing one if appropriate. If the decl is
4105 // in an outer scope, it isn't the same thing.
Richard Smith3e4c6c42011-05-05 21:57:07 +00004106 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false,
Douglas Gregorcc209452011-03-07 16:54:27 +00004107 /*ExplicitInstantiationOrSpecialization=*/false);
Eli Friedmanbf87f2c2010-08-10 03:13:15 +00004108 if (!Previous.empty()) {
4109 Redeclaration = true;
Richard Smith162e1c12011-04-15 14:24:37 +00004110 MergeTypedefNameDecl(NewTD, Previous);
Eli Friedmanbf87f2c2010-08-10 03:13:15 +00004111 }
4112
Douglas Gregorc29f77b2009-07-07 16:35:42 +00004113 // If this is the C FILE type, notify the AST context.
4114 if (IdentifierInfo *II = NewTD->getIdentifier())
4115 if (!NewTD->isInvalidDecl() &&
Sebastian Redl7a126a42010-08-31 00:36:30 +00004116 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) {
Mike Stump782fa302009-07-28 02:25:19 +00004117 if (II->isStr("FILE"))
4118 Context.setFILEDecl(NewTD);
4119 else if (II->isStr("jmp_buf"))
4120 Context.setjmp_bufDecl(NewTD);
4121 else if (II->isStr("sigjmp_buf"))
4122 Context.setsigjmp_bufDecl(NewTD);
Rafael Espindolae2d4f4e2011-11-13 21:51:09 +00004123 else if (II->isStr("ucontext_t"))
4124 Context.setucontext_tDecl(NewTD);
Mike Stump782fa302009-07-28 02:25:19 +00004125 }
4126
Zhongxing Xud5ed8c32009-01-16 03:34:13 +00004127 return NewTD;
4128}
4129
Douglas Gregor8f301052009-02-24 19:23:27 +00004130/// \brief Determines whether the given declaration is an out-of-scope
4131/// previous declaration.
4132///
4133/// This routine should be invoked when name lookup has found a
4134/// previous declaration (PrevDecl) that is not in the scope where a
4135/// new declaration by the same name is being introduced. If the new
4136/// declaration occurs in a local scope, previous declarations with
4137/// linkage may still be considered previous declarations (C99
4138/// 6.2.2p4-5, C++ [basic.link]p6).
4139///
4140/// \param PrevDecl the previous declaration found by name
4141/// lookup
Mike Stump1eb44332009-09-09 15:08:12 +00004142///
Douglas Gregor8f301052009-02-24 19:23:27 +00004143/// \param DC the context in which the new declaration is being
4144/// declared.
4145///
4146/// \returns true if PrevDecl is an out-of-scope previous declaration
4147/// for a new delcaration with the same name.
Mike Stump1eb44332009-09-09 15:08:12 +00004148static bool
Douglas Gregor8f301052009-02-24 19:23:27 +00004149isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC,
4150 ASTContext &Context) {
4151 if (!PrevDecl)
Sebastian Redl7a126a42010-08-31 00:36:30 +00004152 return false;
Douglas Gregor8f301052009-02-24 19:23:27 +00004153
Douglas Gregord6f7e9d2009-02-24 20:03:32 +00004154 if (!PrevDecl->hasLinkage())
4155 return false;
Douglas Gregor8f301052009-02-24 19:23:27 +00004156
David Blaikie4e4d0842012-03-11 07:00:24 +00004157 if (Context.getLangOpts().CPlusPlus) {
Douglas Gregor8f301052009-02-24 19:23:27 +00004158 // C++ [basic.link]p6:
4159 // If there is a visible declaration of an entity with linkage
4160 // having the same name and type, ignoring entities declared
4161 // outside the innermost enclosing namespace scope, the block
4162 // scope declaration declares that same entity and receives the
4163 // linkage of the previous declaration.
Sebastian Redl7a126a42010-08-31 00:36:30 +00004164 DeclContext *OuterContext = DC->getRedeclContext();
Douglas Gregor8f301052009-02-24 19:23:27 +00004165 if (!OuterContext->isFunctionOrMethod())
4166 // This rule only applies to block-scope declarations.
4167 return false;
Douglas Gregor757c6002010-08-27 22:55:10 +00004168
4169 DeclContext *PrevOuterContext = PrevDecl->getDeclContext();
4170 if (PrevOuterContext->isRecord())
4171 // We found a member function: ignore it.
4172 return false;
4173
4174 // Find the innermost enclosing namespace for the new and
4175 // previous declarations.
Sebastian Redl7a126a42010-08-31 00:36:30 +00004176 OuterContext = OuterContext->getEnclosingNamespaceContext();
4177 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext();
Mike Stump1eb44332009-09-09 15:08:12 +00004178
Douglas Gregor757c6002010-08-27 22:55:10 +00004179 // The previous declaration is in a different namespace, so it
4180 // isn't the same function.
4181 if (!OuterContext->Equals(PrevOuterContext))
4182 return false;
Douglas Gregor8f301052009-02-24 19:23:27 +00004183 }
4184
Douglas Gregor8f301052009-02-24 19:23:27 +00004185 return true;
4186}
4187
John McCallb6217662010-03-15 10:12:16 +00004188static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) {
4189 CXXScopeSpec &SS = D.getCXXScopeSpec();
4190 if (!SS.isSet()) return;
Douglas Gregorc22b5ff2011-02-25 02:25:35 +00004191 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext()));
John McCallb6217662010-03-15 10:12:16 +00004192}
4193
John McCallf85e1932011-06-15 23:02:42 +00004194bool Sema::inferObjCARCLifetime(ValueDecl *decl) {
4195 QualType type = decl->getType();
4196 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime();
4197 if (lifetime == Qualifiers::OCL_Autoreleasing) {
4198 // Various kinds of declaration aren't allowed to be __autoreleasing.
4199 unsigned kind = -1U;
4200 if (VarDecl *var = dyn_cast<VarDecl>(decl)) {
4201 if (var->hasAttr<BlocksAttr>())
4202 kind = 0; // __block
4203 else if (!var->hasLocalStorage())
4204 kind = 1; // global
4205 } else if (isa<ObjCIvarDecl>(decl)) {
4206 kind = 3; // ivar
4207 } else if (isa<FieldDecl>(decl)) {
4208 kind = 2; // field
4209 }
4210
4211 if (kind != -1U) {
4212 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var)
4213 << kind;
4214 }
4215 } else if (lifetime == Qualifiers::OCL_None) {
4216 // Try to infer lifetime.
4217 if (!type->isObjCLifetimeType())
4218 return false;
4219
4220 lifetime = type->getObjCARCImplicitLifetime();
4221 type = Context.getLifetimeQualifiedType(type, lifetime);
4222 decl->setType(type);
4223 }
4224
4225 if (VarDecl *var = dyn_cast<VarDecl>(decl)) {
4226 // Thread-local variables cannot have lifetime.
4227 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone &&
4228 var->isThreadSpecified()) {
Argyrios Kyrtzidisb8b03132011-06-24 00:08:59 +00004229 Diag(var->getLocation(), diag::err_arc_thread_ownership)
John McCallf85e1932011-06-15 23:02:42 +00004230 << var->getType();
4231 return true;
4232 }
4233 }
4234
4235 return false;
4236}
4237
Douglas Gregor4afa39d2009-01-20 01:17:11 +00004238NamedDecl*
Chris Lattner16c5dea2010-10-10 18:16:20 +00004239Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC,
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00004240 TypeSourceInfo *TInfo, LookupResult &Previous,
4241 MultiTemplateParamsArg TemplateParamLists) {
4242 QualType R = TInfo->getType();
Abramo Bagnara25777432010-08-11 22:01:17 +00004243 DeclarationName Name = GetNameForDeclarator(D).getName();
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00004244
4245 // Check that there are no default arguments (C++ only).
David Blaikie4e4d0842012-03-11 07:00:24 +00004246 if (getLangOpts().CPlusPlus)
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00004247 CheckExtraCXXDefaultArguments(D);
4248
Douglas Gregor16573fa2010-04-19 22:54:31 +00004249 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec();
4250 assert(SCSpec != DeclSpec::SCS_typedef &&
4251 "Parser allowed 'typedef' as storage class VarDecl.");
Abramo Bagnara35f9a192010-07-30 16:47:02 +00004252 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec);
Douglas Gregor16573fa2010-04-19 22:54:31 +00004253 if (SCSpec == DeclSpec::SCS_mutable) {
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00004254 // mutable can only appear on non-static class members, so it's always
4255 // an error here
4256 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember);
Chris Lattnereaaebc72009-04-25 08:06:05 +00004257 D.setInvalidType();
John McCalld931b082010-08-26 03:08:43 +00004258 SC = SC_None;
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00004259 }
Douglas Gregor16573fa2010-04-19 22:54:31 +00004260 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten();
4261 VarDecl::StorageClass SCAsWritten
Abramo Bagnara35f9a192010-07-30 16:47:02 +00004262 = StorageClassSpecToVarDeclStorageClass(SCSpec);
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00004263
4264 IdentifierInfo *II = Name.getAsIdentifierInfo();
4265 if (!II) {
4266 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name)
Douglas Gregorb5a01872011-10-09 18:55:59 +00004267 << Name;
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00004268 return 0;
4269 }
4270
Eli Friedman85a53192009-04-07 19:37:57 +00004271 DiagnoseFunctionSpecifiers(D);
Douglas Gregor021c3b32009-03-11 23:00:04 +00004272
Douglas Gregor2d2e9cf2009-03-11 20:22:50 +00004273 if (!DC->isRecord() && S->getFnParent() == 0) {
4274 // C99 6.9p2: The storage-class specifiers auto and register shall not
4275 // appear in the declaration specifiers in an external declaration.
John McCalld931b082010-08-26 03:08:43 +00004276 if (SC == SC_Auto || SC == SC_Register) {
Mike Stump1eb44332009-09-09 15:08:12 +00004277
Chris Lattnerd4b19d52009-05-12 21:44:00 +00004278 // If this is a register variable with an asm label specified, then this
4279 // is a GNU extension.
John McCalld931b082010-08-26 03:08:43 +00004280 if (SC == SC_Register && D.getAsmLabel())
Chris Lattnerd4b19d52009-05-12 21:44:00 +00004281 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register);
4282 else
4283 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope);
Chris Lattnereaaebc72009-04-25 08:06:05 +00004284 D.setInvalidType();
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00004285 }
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00004286 }
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00004287
David Blaikie4e4d0842012-03-11 07:00:24 +00004288 if (getLangOpts().OpenCL) {
Peter Collingbourne8c25fc52011-09-19 21:14:35 +00004289 // Set up the special work-group-local storage class for variables in the
4290 // OpenCL __local address space.
Rafael Espindola0db661e2012-12-21 01:21:33 +00004291 if (R.getAddressSpace() == LangAS::opencl_local) {
Peter Collingbourne8c25fc52011-09-19 21:14:35 +00004292 SC = SC_OpenCLWorkGroupLocal;
Rafael Espindola0db661e2012-12-21 01:21:33 +00004293 SCAsWritten = SC_OpenCLWorkGroupLocal;
4294 }
Peter Collingbourne8c25fc52011-09-19 21:14:35 +00004295 }
4296
Ted Kremenek9577abc2011-01-23 17:04:59 +00004297 bool isExplicitSpecialization = false;
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00004298 VarDecl *NewVD;
David Blaikie4e4d0842012-03-11 07:00:24 +00004299 if (!getLangOpts().CPlusPlus) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00004300 NewVD = VarDecl::Create(Context, DC, D.getLocStart(),
Abramo Bagnaraff676cb2011-03-08 08:55:46 +00004301 D.getIdentifierLoc(), II,
4302 R, TInfo, SC, SCAsWritten);
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00004303
4304 if (D.isInvalidType())
4305 NewVD->setInvalidDecl();
4306 } else {
4307 if (DC->isRecord() && !CurContext->isRecord()) {
4308 // This is an out-of-line definition of a static data member.
4309 if (SC == SC_Static) {
4310 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
4311 diag::err_static_out_of_line)
4312 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
4313 } else if (SC == SC_None)
4314 SC = SC_Static;
Anders Carlssone98da2e2009-06-24 00:28:53 +00004315 }
Richard Smithb9c64d82012-02-16 20:41:22 +00004316 if (SC == SC_Static && CurContext->isRecord()) {
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00004317 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) {
4318 if (RD->isLocalClass())
4319 Diag(D.getIdentifierLoc(),
4320 diag::err_static_data_member_not_allowed_in_local_class)
4321 << Name << RD->getDeclName();
Mike Stump1eb44332009-09-09 15:08:12 +00004322
Richard Smithb9c64d82012-02-16 20:41:22 +00004323 // C++98 [class.union]p1: If a union contains a static data member,
4324 // the program is ill-formed. C++11 drops this restriction.
4325 if (RD->isUnion())
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00004326 Diag(D.getIdentifierLoc(),
David Blaikie4e4d0842012-03-11 07:00:24 +00004327 getLangOpts().CPlusPlus0x
Richard Smithb9c64d82012-02-16 20:41:22 +00004328 ? diag::warn_cxx98_compat_static_data_member_in_union
4329 : diag::ext_static_data_member_in_union) << Name;
4330 // We conservatively disallow static data members in anonymous structs.
4331 else if (!RD->getDeclName())
4332 Diag(D.getIdentifierLoc(),
4333 diag::err_static_data_member_not_allowed_in_anon_struct)
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00004334 << Name << RD->isUnion();
4335 }
4336 }
4337
4338 // Match up the template parameter lists with the scope specifier, then
4339 // determine whether we have a template or a template specialization.
4340 isExplicitSpecialization = false;
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00004341 bool Invalid = false;
4342 if (TemplateParameterList *TemplateParams
Douglas Gregor1fef4e62009-10-07 22:35:40 +00004343 = MatchTemplateParametersToScopeSpecifier(
Daniel Dunbar96a00142012-03-09 18:35:03 +00004344 D.getDeclSpec().getLocStart(),
Douglas Gregorc8406492011-05-10 18:27:06 +00004345 D.getIdentifierLoc(),
Douglas Gregor1fef4e62009-10-07 22:35:40 +00004346 D.getCXXScopeSpec(),
Benjamin Kramer5354e772012-08-23 23:38:35 +00004347 TemplateParamLists.data(),
John McCall9a34edb2010-10-19 01:40:49 +00004348 TemplateParamLists.size(),
John McCall77e8b112010-04-13 20:37:33 +00004349 /*never a friend*/ false,
Douglas Gregor0167f3c2010-07-14 23:14:12 +00004350 isExplicitSpecialization,
4351 Invalid)) {
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00004352 if (TemplateParams->size() > 0) {
4353 // There is no such thing as a variable template.
4354 Diag(D.getIdentifierLoc(), diag::err_template_variable)
4355 << II
4356 << SourceRange(TemplateParams->getTemplateLoc(),
4357 TemplateParams->getRAngleLoc());
4358 return 0;
4359 } else {
4360 // There is an extraneous 'template<>' for this variable. Complain
4361 // about it, but allow the declaration of the variable.
4362 Diag(TemplateParams->getTemplateLoc(),
4363 diag::err_template_variable_noparams)
4364 << II
4365 << SourceRange(TemplateParams->getTemplateLoc(),
4366 TemplateParams->getRAngleLoc());
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00004367 }
Douglas Gregordfe3f2d2009-07-22 17:18:37 +00004368 }
Mike Stump1eb44332009-09-09 15:08:12 +00004369
Daniel Dunbar96a00142012-03-09 18:35:03 +00004370 NewVD = VarDecl::Create(Context, DC, D.getLocStart(),
Abramo Bagnaraff676cb2011-03-08 08:55:46 +00004371 D.getIdentifierLoc(), II,
4372 R, TInfo, SC, SCAsWritten);
Eli Friedman63054b32009-04-19 20:27:55 +00004373
Richard Smith483b9f32011-02-21 20:05:19 +00004374 // If this decl has an auto type in need of deduction, make a note of the
4375 // Decl so we can diagnose uses of it in its own initializer.
4376 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto &&
4377 R->getContainedAutoType())
4378 ParsingInitForAutoVars.insert(NewVD);
Richard Smith34b41d92011-02-20 03:19:35 +00004379
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00004380 if (D.isInvalidType() || Invalid)
4381 NewVD->setInvalidDecl();
Mike Stump1eb44332009-09-09 15:08:12 +00004382
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00004383 SetNestedNameSpecifier(NewVD, D);
John McCallb6217662010-03-15 10:12:16 +00004384
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00004385 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) {
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00004386 NewVD->setTemplateParameterListsInfo(Context,
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00004387 TemplateParamLists.size(),
Benjamin Kramer5354e772012-08-23 23:38:35 +00004388 TemplateParamLists.data());
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00004389 }
Richard Smithaf1fc7a2011-08-15 21:04:07 +00004390
Richard Smith7ca48502012-02-13 22:16:19 +00004391 if (D.getDeclSpec().isConstexprSpecified())
Richard Smithdd4b3502011-12-25 21:17:58 +00004392 NewVD->setConstexpr(true);
Abramo Bagnara9b934882010-06-12 08:15:14 +00004393 }
4394
Douglas Gregore3895852011-09-12 18:37:38 +00004395 // Set the lexical context. If the declarator has a C++ scope specifier, the
4396 // lexical context will be different from the semantic context.
4397 NewVD->setLexicalDeclContext(CurContext);
4398
Eli Friedman63054b32009-04-19 20:27:55 +00004399 if (D.getDeclSpec().isThreadSpecified()) {
4400 if (NewVD->hasLocalStorage())
4401 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global);
Douglas Gregorbcfd1f52011-09-02 00:18:52 +00004402 else if (!Context.getTargetInfo().isTLSSupported())
Eli Friedman4fb71b02009-04-19 21:48:33 +00004403 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported);
Eli Friedman63054b32009-04-19 20:27:55 +00004404 else
4405 NewVD->setThreadSpecified(true);
4406 }
Douglas Gregor4afa39d2009-01-20 01:17:11 +00004407
Douglas Gregord023aec2011-09-09 20:53:38 +00004408 if (D.getDeclSpec().isModulePrivateSpecified()) {
4409 if (isExplicitSpecialization)
4410 Diag(NewVD->getLocation(), diag::err_module_private_specialization)
4411 << 2
4412 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc());
Douglas Gregore3895852011-09-12 18:37:38 +00004413 else if (NewVD->hasLocalStorage())
4414 Diag(NewVD->getLocation(), diag::err_module_private_local)
4415 << 0 << NewVD->getDeclName()
4416 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc())
4417 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc());
Douglas Gregord023aec2011-09-09 20:53:38 +00004418 else
4419 NewVD->setModulePrivate();
4420 }
Douglas Gregor8d267c52011-09-09 02:06:17 +00004421
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00004422 // Handle attributes prior to checking for duplicates in MergeVarDecl
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00004423 ProcessDeclAttributes(S, NewVD, D);
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00004424
Peter Collingbournec0c00662012-08-28 20:37:50 +00004425 if (getLangOpts().CUDA) {
4426 // CUDA B.2.5: "__shared__ and __constant__ variables have implied static
4427 // storage [duration]."
4428 if (SC == SC_None && S->getFnParent() != 0 &&
Rafael Espindola0db661e2012-12-21 01:21:33 +00004429 (NewVD->hasAttr<CUDASharedAttr>() ||
4430 NewVD->hasAttr<CUDAConstantAttr>())) {
Peter Collingbournec0c00662012-08-28 20:37:50 +00004431 NewVD->setStorageClass(SC_Static);
Rafael Espindola0db661e2012-12-21 01:21:33 +00004432 NewVD->setStorageClassAsWritten(SC_Static);
4433 }
Peter Collingbournec0c00662012-08-28 20:37:50 +00004434 }
4435
John McCallf85e1932011-06-15 23:02:42 +00004436 // In auto-retain/release, infer strong retension for variables of
4437 // retainable type.
David Blaikie4e4d0842012-03-11 07:00:24 +00004438 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewVD))
John McCallf85e1932011-06-15 23:02:42 +00004439 NewVD->setInvalidDecl();
4440
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00004441 // Handle GNU asm-label extension (encoded as an attribute).
Chris Lattner16c5dea2010-10-10 18:16:20 +00004442 if (Expr *E = (Expr*)D.getAsmLabel()) {
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00004443 // The parser guarantees this is a string.
Mike Stump1eb44332009-09-09 15:08:12 +00004444 StringLiteral *SE = cast<StringLiteral>(E);
Chris Lattner5f9e2722011-07-23 10:55:15 +00004445 StringRef Label = SE->getString();
Abramo Bagnara2b57aef2011-01-11 15:16:52 +00004446 if (S->getFnParent() != 0) {
4447 switch (SC) {
4448 case SC_None:
4449 case SC_Auto:
4450 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label;
4451 break;
4452 case SC_Register:
Douglas Gregorbcfd1f52011-09-02 00:18:52 +00004453 if (!Context.getTargetInfo().isValidGCCRegisterName(Label))
Abramo Bagnara2b57aef2011-01-11 15:16:52 +00004454 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label;
4455 break;
4456 case SC_Static:
4457 case SC_Extern:
4458 case SC_PrivateExtern:
Peter Collingbourne8c25fc52011-09-19 21:14:35 +00004459 case SC_OpenCLWorkGroupLocal:
Abramo Bagnara2b57aef2011-01-11 15:16:52 +00004460 break;
4461 }
4462 }
4463
4464 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0),
Rafael Espindolabaf86952011-01-01 21:47:03 +00004465 Context, Label));
David Chisnall5f3c1632012-02-18 16:12:34 +00004466 } else if (!ExtnameUndeclaredIdentifiers.empty()) {
4467 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I =
4468 ExtnameUndeclaredIdentifiers.find(NewVD->getIdentifier());
4469 if (I != ExtnameUndeclaredIdentifiers.end()) {
4470 NewVD->addAttr(I->second);
4471 ExtnameUndeclaredIdentifiers.erase(I);
4472 }
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00004473 }
4474
John McCall8472af42010-03-16 21:48:18 +00004475 // Diagnose shadowed variables before filtering for scope.
John McCalla369a952010-03-20 04:12:52 +00004476 if (!D.getCXXScopeSpec().isSet())
John McCall053f4bd2010-03-22 09:20:08 +00004477 CheckShadow(S, NewVD, Previous);
John McCall8472af42010-03-16 21:48:18 +00004478
John McCall68263142009-11-18 22:49:29 +00004479 // Don't consider existing declarations that are in a different
4480 // scope and are out-of-semantic-context declarations (if the new
4481 // declaration has linkage).
Richard Smith3e4c6c42011-05-05 21:57:07 +00004482 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(),
Douglas Gregorcc209452011-03-07 16:54:27 +00004483 isExplicitSpecialization);
Douglas Gregor251b4ff2009-10-08 07:24:58 +00004484
David Blaikie4e4d0842012-03-11 07:00:24 +00004485 if (!getLangOpts().CPlusPlus) {
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00004486 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous));
4487 } else {
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00004488 // Merge the decl with the existing one if appropriate.
4489 if (!Previous.empty()) {
4490 if (Previous.isSingleResult() &&
4491 isa<FieldDecl>(Previous.getFoundDecl()) &&
4492 D.getCXXScopeSpec().isSet()) {
4493 // The user tried to define a non-static data member
4494 // out-of-line (C++ [dcl.meaning]p1).
4495 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line)
4496 << D.getCXXScopeSpec().getRange();
4497 Previous.clear();
4498 NewVD->setInvalidDecl();
4499 }
4500 } else if (D.getCXXScopeSpec().isSet()) {
4501 // No previous declaration in the qualifying scope.
4502 Diag(D.getIdentifierLoc(), diag::err_no_member)
4503 << Name << computeDeclContext(D.getCXXScopeSpec(), true)
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00004504 << D.getCXXScopeSpec().getRange();
Chris Lattnereaaebc72009-04-25 08:06:05 +00004505 NewVD->setInvalidDecl();
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00004506 }
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00004507
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00004508 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous));
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00004509
4510 // This is an explicit specialization of a static data member. Check it.
4511 if (isExplicitSpecialization && !NewVD->isInvalidDecl() &&
4512 CheckMemberSpecialization(NewVD, Previous))
4513 NewVD->setInvalidDecl();
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00004514 }
Ryan Flynn478fbc62009-07-25 22:29:44 +00004515
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00004516 // If this is a locally-scoped extern C variable, update the map of
4517 // such variables.
Douglas Gregor48a83b52009-09-12 00:17:51 +00004518 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() &&
Chris Lattnereaaebc72009-04-25 08:06:05 +00004519 !NewVD->isInvalidDecl())
John McCall68263142009-11-18 22:49:29 +00004520 RegisterLocallyScopedExternCDecl(NewVD, Previous, S);
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00004521
Eli Friedmanaa8b0d12010-08-05 06:57:20 +00004522 // If there's a #pragma GCC visibility in scope, and this isn't a class
4523 // member, set the visibility of this variable.
4524 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord())
4525 AddPushedVisibilityAttribute(NewVD);
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00004526
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00004527 MarkUnusedFileScopedDecl(NewVD);
4528
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00004529 return NewVD;
4530}
4531
John McCall053f4bd2010-03-22 09:20:08 +00004532/// \brief Diagnose variable or built-in function shadowing. Implements
4533/// -Wshadow.
John McCall8472af42010-03-16 21:48:18 +00004534///
John McCall053f4bd2010-03-22 09:20:08 +00004535/// This method is called whenever a VarDecl is added to a "useful"
4536/// scope.
John McCall8472af42010-03-16 21:48:18 +00004537///
John McCalla369a952010-03-20 04:12:52 +00004538/// \param S the scope in which the shadowing name is being declared
4539/// \param R the lookup of the name
John McCall8472af42010-03-16 21:48:18 +00004540///
John McCall053f4bd2010-03-22 09:20:08 +00004541void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) {
John McCall8472af42010-03-16 21:48:18 +00004542 // Return if warning is ignored.
Argyrios Kyrtzidis08274082010-12-15 18:44:22 +00004543 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) ==
David Blaikied6471f72011-09-25 23:23:43 +00004544 DiagnosticsEngine::Ignored)
John McCall8472af42010-03-16 21:48:18 +00004545 return;
4546
Argyrios Kyrtzidis651f86f2011-02-08 18:21:25 +00004547 // Don't diagnose declarations at file scope.
Argyrios Kyrtzidis865dd8c2011-04-25 21:39:50 +00004548 if (D->hasGlobalStorage())
John McCall8472af42010-03-16 21:48:18 +00004549 return;
Argyrios Kyrtzidis865dd8c2011-04-25 21:39:50 +00004550
4551 DeclContext *NewDC = D->getDeclContext();
4552
John McCalla369a952010-03-20 04:12:52 +00004553 // Only diagnose if we're shadowing an unambiguous field or variable.
Douglas Gregorc48c9162010-03-17 16:03:44 +00004554 if (R.getResultKind() != LookupResult::Found)
John McCall8472af42010-03-16 21:48:18 +00004555 return;
John McCall8472af42010-03-16 21:48:18 +00004556
John McCall8472af42010-03-16 21:48:18 +00004557 NamedDecl* ShadowedDecl = R.getFoundDecl();
4558 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl))
4559 return;
4560
Argyrios Kyrtzidis36eb5e42011-01-31 07:04:54 +00004561 // Fields are not shadowed by variables in C++ static methods.
4562 if (isa<FieldDecl>(ShadowedDecl))
4563 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC))
4564 if (MD->isStatic())
4565 return;
4566
Argyrios Kyrtzidis49a61722011-01-31 07:04:50 +00004567 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl))
4568 if (shadowedVar->isExternC()) {
Argyrios Kyrtzidis49a61722011-01-31 07:04:50 +00004569 // For shadowing external vars, make sure that we point to the global
4570 // declaration, not a locally scoped extern declaration.
4571 for (VarDecl::redecl_iterator
4572 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end();
4573 I != E; ++I)
4574 if (I->isFileVarDecl()) {
4575 ShadowedDecl = *I;
4576 break;
4577 }
4578 }
4579
4580 DeclContext *OldDC = ShadowedDecl->getDeclContext();
4581
John McCalla369a952010-03-20 04:12:52 +00004582 // Only warn about certain kinds of shadowing for class members.
4583 if (NewDC && NewDC->isRecord()) {
4584 // In particular, don't warn about shadowing non-class members.
4585 if (!OldDC->isRecord())
4586 return;
4587
4588 // TODO: should we warn about static data members shadowing
4589 // static data members from base classes?
4590
4591 // TODO: don't diagnose for inaccessible shadowed members.
4592 // This is hard to do perfectly because we might friend the
4593 // shadowing context, but that's just a false negative.
4594 }
4595
4596 // Determine what kind of declaration we're shadowing.
John McCall8472af42010-03-16 21:48:18 +00004597 unsigned Kind;
John McCalla369a952010-03-20 04:12:52 +00004598 if (isa<RecordDecl>(OldDC)) {
John McCall8472af42010-03-16 21:48:18 +00004599 if (isa<FieldDecl>(ShadowedDecl))
4600 Kind = 3; // field
4601 else
4602 Kind = 2; // static data member
John McCalla369a952010-03-20 04:12:52 +00004603 } else if (OldDC->isFileContext())
John McCall8472af42010-03-16 21:48:18 +00004604 Kind = 1; // global
4605 else
4606 Kind = 0; // local
4607
John McCalla369a952010-03-20 04:12:52 +00004608 DeclarationName Name = R.getLookupName();
4609
John McCall8472af42010-03-16 21:48:18 +00004610 // Emit warning and note.
John McCalla369a952010-03-20 04:12:52 +00004611 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC;
John McCall8472af42010-03-16 21:48:18 +00004612 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration);
4613}
4614
John McCall053f4bd2010-03-22 09:20:08 +00004615/// \brief Check -Wshadow without the advantage of a previous lookup.
4616void Sema::CheckShadow(Scope *S, VarDecl *D) {
Argyrios Kyrtzidis08274082010-12-15 18:44:22 +00004617 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) ==
David Blaikied6471f72011-09-25 23:23:43 +00004618 DiagnosticsEngine::Ignored)
Argyrios Kyrtzidis08274082010-12-15 18:44:22 +00004619 return;
4620
John McCall053f4bd2010-03-22 09:20:08 +00004621 LookupResult R(*this, D->getDeclName(), D->getLocation(),
4622 Sema::LookupOrdinaryName, Sema::ForRedeclaration);
4623 LookupName(R, S);
4624 CheckShadow(S, D, R);
4625}
4626
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00004627/// \brief Perform semantic checking on a newly-created variable
4628/// declaration.
4629///
4630/// This routine performs all of the type-checking required for a
Douglas Gregor180bb632009-05-01 15:47:09 +00004631/// variable declaration once it has been built. It is used both to
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00004632/// check variables after they have been parsed and their declarators
Douglas Gregor180bb632009-05-01 15:47:09 +00004633/// have been translated into a declaration, and to check variables
4634/// that have been instantiated from a template.
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00004635///
Chris Lattnereaaebc72009-04-25 08:06:05 +00004636/// Sets NewVD->isInvalidDecl() if an error was encountered.
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00004637///
4638/// Returns true if the variable declaration is a redeclaration.
4639bool Sema::CheckVariableDeclaration(VarDecl *NewVD,
4640 LookupResult &Previous) {
Chris Lattnereaaebc72009-04-25 08:06:05 +00004641 // If the decl is already known invalid, don't check it.
4642 if (NewVD->isInvalidDecl())
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00004643 return false;
Mike Stump1eb44332009-09-09 15:08:12 +00004644
Abramo Bagnara4c5750e2012-11-08 14:44:42 +00004645 TypeSourceInfo *TInfo = NewVD->getTypeSourceInfo();
4646 QualType T = TInfo->getType();
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00004647
John McCallc12c5bb2010-05-15 11:32:37 +00004648 if (T->isObjCObjectType()) {
Fariborz Jahaniandcf10112011-07-25 21:12:27 +00004649 Diag(NewVD->getLocation(), diag::err_statically_allocated_object)
4650 << FixItHint::CreateInsertion(NewVD->getLocation(), "*");
Fariborz Jahanian8eaefdc2011-07-26 17:58:54 +00004651 T = Context.getObjCObjectPointerType(T);
4652 NewVD->setType(T);
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00004653 }
Mike Stump1eb44332009-09-09 15:08:12 +00004654
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00004655 // Emit an error if an address space was applied to decl with local storage.
4656 // This includes arrays of objects with address space qualifiers, but not
4657 // automatic variables that point to other address spaces.
4658 // ISO/IEC TR 18037 S5.1.2
Chris Lattner16c5dea2010-10-10 18:16:20 +00004659 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) {
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00004660 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl);
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00004661 NewVD->setInvalidDecl();
4662 return false;
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00004663 }
Fariborz Jahanian7b5b3172009-02-21 19:44:02 +00004664
Tanya Lattner5e94d6f2012-06-19 23:09:52 +00004665 // OpenCL v1.2 s6.8 -- The static qualifier is valid only in program
4666 // scope.
4667 if ((getLangOpts().OpenCLVersion >= 120)
4668 && NewVD->isStaticLocal()) {
4669 Diag(NewVD->getLocation(), diag::err_static_function_scope);
4670 NewVD->setInvalidDecl();
4671 return false;
4672 }
4673
Mike Stumpf33651c2009-04-14 00:57:29 +00004674 if (NewVD->hasLocalStorage() && T.isObjCGCWeak()
Fariborz Jahanian175df892011-06-07 20:15:46 +00004675 && !NewVD->hasAttr<BlocksAttr>()) {
David Blaikie4e4d0842012-03-11 07:00:24 +00004676 if (getLangOpts().getGC() != LangOptions::NonGC)
Fariborz Jahanian175df892011-06-07 20:15:46 +00004677 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local);
Ted Kremenek3ba17ee2012-10-02 05:36:02 +00004678 else {
4679 assert(!getLangOpts().ObjCAutoRefCount);
Fariborz Jahanian175df892011-06-07 20:15:46 +00004680 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local);
Ted Kremenek3ba17ee2012-10-02 05:36:02 +00004681 }
Fariborz Jahanian175df892011-06-07 20:15:46 +00004682 }
Chris Lattner16c5dea2010-10-10 18:16:20 +00004683
Chris Lattner38c5ebd2009-04-19 05:21:20 +00004684 bool isVM = T->isVariablyModifiedType();
Chris Lattnerbe6d2592009-07-19 20:17:11 +00004685 if (isVM || NewVD->hasAttr<CleanupAttr>() ||
John McCalle46f62c2010-08-01 01:24:59 +00004686 NewVD->hasAttr<BlocksAttr>())
John McCall781472f2010-08-25 08:40:02 +00004687 getCurFunction()->setHasBranchProtectedScope();
Mike Stump1eb44332009-09-09 15:08:12 +00004688
Chris Lattner38c5ebd2009-04-19 05:21:20 +00004689 if ((isVM && NewVD->hasLinkage()) ||
4690 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) {
Anders Carlsson1a7acfa2009-02-28 21:56:50 +00004691 bool SizeIsNegative;
Douglas Gregor2767ce22010-08-18 00:39:00 +00004692 llvm::APSInt Oversized;
Abramo Bagnara4c5750e2012-11-08 14:44:42 +00004693 TypeSourceInfo *FixedTInfo =
4694 TryToFixInvalidVariablyModifiedTypeSourceInfo(TInfo, Context,
4695 SizeIsNegative, Oversized);
4696 if (FixedTInfo == 0 && T->isVariableArrayType()) {
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00004697 const VariableArrayType *VAT = Context.getAsVariableArrayType(T);
Mike Stump1eb44332009-09-09 15:08:12 +00004698 // FIXME: This won't give the correct result for
4699 // int a[10][n];
Anders Carlsson1a7acfa2009-02-28 21:56:50 +00004700 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange();
Mike Stump1eb44332009-09-09 15:08:12 +00004701
Anders Carlsson1a7acfa2009-02-28 21:56:50 +00004702 if (NewVD->isFileVarDecl())
4703 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope)
Chris Lattnereaaebc72009-04-25 08:06:05 +00004704 << SizeRange;
John McCalld931b082010-08-26 03:08:43 +00004705 else if (NewVD->getStorageClass() == SC_Static)
Anders Carlsson1a7acfa2009-02-28 21:56:50 +00004706 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage)
Chris Lattnereaaebc72009-04-25 08:06:05 +00004707 << SizeRange;
Anders Carlsson1a7acfa2009-02-28 21:56:50 +00004708 else
4709 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage)
Chris Lattnereaaebc72009-04-25 08:06:05 +00004710 << SizeRange;
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00004711 NewVD->setInvalidDecl();
4712 return false;
Mike Stump1eb44332009-09-09 15:08:12 +00004713 }
4714
Abramo Bagnara4c5750e2012-11-08 14:44:42 +00004715 if (FixedTInfo == 0) {
Anders Carlsson1a7acfa2009-02-28 21:56:50 +00004716 if (NewVD->isFileVarDecl())
4717 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope);
4718 else
4719 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage);
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00004720 NewVD->setInvalidDecl();
4721 return false;
Anders Carlsson1a7acfa2009-02-28 21:56:50 +00004722 }
Mike Stump1eb44332009-09-09 15:08:12 +00004723
Chris Lattnereaaebc72009-04-25 08:06:05 +00004724 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size);
Abramo Bagnaraeae859a2012-11-08 16:01:51 +00004725 NewVD->setType(FixedTInfo->getType());
Abramo Bagnara4c5750e2012-11-08 14:44:42 +00004726 NewVD->setTypeSourceInfo(FixedTInfo);
Anders Carlsson1a7acfa2009-02-28 21:56:50 +00004727 }
4728
John McCall68263142009-11-18 22:49:29 +00004729 if (Previous.empty() && NewVD->isExternC()) {
Douglas Gregor63935192009-03-02 00:19:53 +00004730 // Since we did not find anything by this name and we're declaring
4731 // an extern "C" variable, look for a non-visible extern "C"
4732 // declaration with the same name.
4733 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
Douglas Gregorec12ce22011-07-28 14:20:37 +00004734 = findLocallyScopedExternalDecl(NewVD->getDeclName());
Douglas Gregor63935192009-03-02 00:19:53 +00004735 if (Pos != LocallyScopedExternalDecls.end())
John McCall68263142009-11-18 22:49:29 +00004736 Previous.addDecl(Pos->second);
Douglas Gregor63935192009-03-02 00:19:53 +00004737 }
4738
Chris Lattnereaaebc72009-04-25 08:06:05 +00004739 if (T->isVoidType() && !NewVD->hasExternalStorage()) {
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00004740 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type)
4741 << T;
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00004742 NewVD->setInvalidDecl();
4743 return false;
Douglas Gregor3d7a12a2009-03-25 23:32:15 +00004744 }
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00004745
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00004746 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) {
Mike Stumpea000bf2009-04-30 00:19:40 +00004747 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal);
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00004748 NewVD->setInvalidDecl();
4749 return false;
Mike Stumpea000bf2009-04-30 00:19:40 +00004750 }
Mike Stump1eb44332009-09-09 15:08:12 +00004751
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00004752 if (isVM && NewVD->hasAttr<BlocksAttr>()) {
Mike Stumpc975bb02009-05-01 23:41:47 +00004753 Diag(NewVD->getLocation(), diag::err_block_on_vm);
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00004754 NewVD->setInvalidDecl();
4755 return false;
Mike Stumpc975bb02009-05-01 23:41:47 +00004756 }
4757
Richard Smith7ca48502012-02-13 22:16:19 +00004758 if (NewVD->isConstexpr() && !T->isDependentType() &&
4759 RequireLiteralType(NewVD->getLocation(), T,
Douglas Gregorf502d8e2012-05-04 16:48:41 +00004760 diag::err_constexpr_var_non_literal)) {
Richard Smith7ca48502012-02-13 22:16:19 +00004761 NewVD->setInvalidDecl();
4762 return false;
4763 }
4764
John McCall68263142009-11-18 22:49:29 +00004765 if (!Previous.empty()) {
John McCall68263142009-11-18 22:49:29 +00004766 MergeVarDecl(NewVD, Previous);
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00004767 return true;
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00004768 }
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00004769 return false;
Zhongxing Xucb8f4f12009-01-16 02:36:34 +00004770}
4771
Douglas Gregora8f32e02009-10-06 17:59:45 +00004772/// \brief Data used with FindOverriddenMethod
4773struct FindOverriddenMethodData {
4774 Sema *S;
4775 CXXMethodDecl *Method;
4776};
4777
4778/// \brief Member lookup function that determines whether a given C++
4779/// method overrides a method in a base class, to be used with
4780/// CXXRecordDecl::lookupInBases().
John McCallaf8e6ed2009-11-12 03:15:40 +00004781static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier,
Douglas Gregora8f32e02009-10-06 17:59:45 +00004782 CXXBasePath &Path,
4783 void *UserData) {
4784 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl();
Anders Carlsson95496802009-11-26 20:50:40 +00004785
Douglas Gregora8f32e02009-10-06 17:59:45 +00004786 FindOverriddenMethodData *Data
4787 = reinterpret_cast<FindOverriddenMethodData*>(UserData);
Anders Carlsson95496802009-11-26 20:50:40 +00004788
4789 DeclarationName Name = Data->Method->getDeclName();
4790
4791 // FIXME: Do we care about other names here too?
4792 if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
John McCallad00b772010-06-16 08:42:20 +00004793 // We really want to find the base class destructor here.
Anders Carlsson95496802009-11-26 20:50:40 +00004794 QualType T = Data->S->Context.getTypeDeclType(BaseRecord);
4795 CanQualType CT = Data->S->Context.getCanonicalType(T);
4796
Anders Carlsson1a689722009-11-27 01:26:58 +00004797 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT);
Anders Carlsson95496802009-11-26 20:50:40 +00004798 }
4799
4800 for (Path.Decls = BaseRecord->lookup(Name);
David Blaikie3bc93e32012-12-19 00:45:41 +00004801 !Path.Decls.empty();
4802 Path.Decls = Path.Decls.slice(1)) {
4803 NamedDecl *D = Path.Decls.front();
John McCallad00b772010-06-16 08:42:20 +00004804 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) {
4805 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false))
Douglas Gregora8f32e02009-10-06 17:59:45 +00004806 return true;
4807 }
4808 }
4809
4810 return false;
4811}
4812
David Blaikie5708c182012-10-17 00:47:58 +00004813namespace {
4814 enum OverrideErrorKind { OEK_All, OEK_NonDeleted, OEK_Deleted };
4815}
4816/// \brief Report an error regarding overriding, along with any relevant
4817/// overriden methods.
4818///
4819/// \param DiagID the primary error to report.
4820/// \param MD the overriding method.
4821/// \param OEK which overrides to include as notes.
4822static void ReportOverrides(Sema& S, unsigned DiagID, const CXXMethodDecl *MD,
4823 OverrideErrorKind OEK = OEK_All) {
4824 S.Diag(MD->getLocation(), DiagID) << MD->getDeclName();
4825 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(),
4826 E = MD->end_overridden_methods();
4827 I != E; ++I) {
4828 // This check (& the OEK parameter) could be replaced by a predicate, but
4829 // without lambdas that would be overkill. This is still nicer than writing
4830 // out the diag loop 3 times.
4831 if ((OEK == OEK_All) ||
4832 (OEK == OEK_NonDeleted && !(*I)->isDeleted()) ||
4833 (OEK == OEK_Deleted && (*I)->isDeleted()))
4834 S.Diag((*I)->getLocation(), diag::note_overridden_virtual_function);
4835 }
4836}
4837
Sebastian Redla165da02009-11-18 21:51:29 +00004838/// AddOverriddenMethods - See if a method overrides any in the base classes,
4839/// and if so, check that it's a valid override and remember it.
Douglas Gregora6c1e3a2010-10-13 22:55:32 +00004840bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) {
Sebastian Redla165da02009-11-18 21:51:29 +00004841 // Look for virtual methods in base classes that this method might override.
4842 CXXBasePaths Paths;
4843 FindOverriddenMethodData Data;
4844 Data.Method = MD;
4845 Data.S = this;
David Blaikie5708c182012-10-17 00:47:58 +00004846 bool hasDeletedOverridenMethods = false;
4847 bool hasNonDeletedOverridenMethods = false;
Douglas Gregora6c1e3a2010-10-13 22:55:32 +00004848 bool AddedAny = false;
Sebastian Redla165da02009-11-18 21:51:29 +00004849 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) {
4850 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(),
4851 E = Paths.found_decls_end(); I != E; ++I) {
4852 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) {
Richard Trieu304e2332011-07-01 20:02:53 +00004853 MD->addOverriddenMethod(OldMD->getCanonicalDecl());
Sebastian Redla165da02009-11-18 21:51:29 +00004854 if (!CheckOverridingFunctionReturnType(MD, OldMD) &&
Aaron Ballmanfff32482012-12-09 17:45:41 +00004855 !CheckOverridingFunctionAttributes(MD, OldMD) &&
Richard Smithb9d0b762012-07-27 04:22:15 +00004856 !CheckOverridingFunctionExceptionSpec(MD, OldMD) &&
Anders Carlsson2e1c7302011-01-20 16:25:36 +00004857 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) {
David Blaikie5708c182012-10-17 00:47:58 +00004858 hasDeletedOverridenMethods |= OldMD->isDeleted();
4859 hasNonDeletedOverridenMethods |= !OldMD->isDeleted();
Douglas Gregora6c1e3a2010-10-13 22:55:32 +00004860 AddedAny = true;
4861 }
Sebastian Redla165da02009-11-18 21:51:29 +00004862 }
4863 }
4864 }
David Blaikie5708c182012-10-17 00:47:58 +00004865
4866 if (hasDeletedOverridenMethods && !MD->isDeleted()) {
4867 ReportOverrides(*this, diag::err_non_deleted_override, MD, OEK_Deleted);
4868 }
4869 if (hasNonDeletedOverridenMethods && MD->isDeleted()) {
4870 ReportOverrides(*this, diag::err_deleted_override, MD, OEK_NonDeleted);
4871 }
4872
Douglas Gregora6c1e3a2010-10-13 22:55:32 +00004873 return AddedAny;
Sebastian Redla165da02009-11-18 21:51:29 +00004874}
4875
Kaelyn Uhrain2afd7662011-10-11 00:28:39 +00004876namespace {
4877 // Struct for holding all of the extra arguments needed by
4878 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator.
4879 struct ActOnFDArgs {
4880 Scope *S;
4881 Declarator &D;
Kaelyn Uhrain2afd7662011-10-11 00:28:39 +00004882 MultiTemplateParamsArg TemplateParamLists;
Kaelyn Uhrain2afd7662011-10-11 00:28:39 +00004883 bool AddToScope;
4884 };
4885}
4886
Kaelyn Uhrain43e875d2012-01-18 21:41:41 +00004887namespace {
4888
4889// Callback to only accept typo corrections that have a non-zero edit distance.
Kaelyn Uhrain33363532012-02-16 22:40:59 +00004890// Also only accept corrections that have the same parent decl.
Kaelyn Uhrain43e875d2012-01-18 21:41:41 +00004891class DifferentNameValidatorCCC : public CorrectionCandidateCallback {
4892 public:
Kaelyn Uhrainef094a12012-06-07 23:57:08 +00004893 DifferentNameValidatorCCC(ASTContext &Context, FunctionDecl *TypoFD,
4894 CXXRecordDecl *Parent)
4895 : Context(Context), OriginalFD(TypoFD),
4896 ExpectedParent(Parent ? Parent->getCanonicalDecl() : 0) {}
Kaelyn Uhrain33363532012-02-16 22:40:59 +00004897
Kaelyn Uhrain43e875d2012-01-18 21:41:41 +00004898 virtual bool ValidateCandidate(const TypoCorrection &candidate) {
Kaelyn Uhrain33363532012-02-16 22:40:59 +00004899 if (candidate.getEditDistance() == 0)
4900 return false;
4901
Kaelyn Uhrainef094a12012-06-07 23:57:08 +00004902 llvm::SmallVector<unsigned, 1> MismatchedParams;
4903 for (TypoCorrection::const_decl_iterator CDecl = candidate.begin(),
4904 CDeclEnd = candidate.end();
4905 CDecl != CDeclEnd; ++CDecl) {
4906 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl);
4907
4908 if (FD && !FD->hasBody() &&
4909 hasSimilarParameters(Context, FD, OriginalFD, MismatchedParams)) {
4910 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
4911 CXXRecordDecl *Parent = MD->getParent();
4912 if (Parent && Parent->getCanonicalDecl() == ExpectedParent)
4913 return true;
4914 } else if (!ExpectedParent) {
4915 return true;
4916 }
4917 }
Kaelyn Uhrain33363532012-02-16 22:40:59 +00004918 }
4919
Kaelyn Uhrainef094a12012-06-07 23:57:08 +00004920 return false;
Kaelyn Uhrain43e875d2012-01-18 21:41:41 +00004921 }
Kaelyn Uhrain33363532012-02-16 22:40:59 +00004922
4923 private:
Kaelyn Uhrainef094a12012-06-07 23:57:08 +00004924 ASTContext &Context;
4925 FunctionDecl *OriginalFD;
Kaelyn Uhrain33363532012-02-16 22:40:59 +00004926 CXXRecordDecl *ExpectedParent;
Kaelyn Uhrain43e875d2012-01-18 21:41:41 +00004927};
4928
4929}
4930
Kaelyn Uhrain2afd7662011-10-11 00:28:39 +00004931/// \brief Generate diagnostics for an invalid function redeclaration.
4932///
4933/// This routine handles generating the diagnostic messages for an invalid
4934/// function redeclaration, including finding possible similar declarations
4935/// or performing typo correction if there are no previous declarations with
4936/// the same name.
4937///
Sylvestre Ledruf3477c12012-09-27 10:16:10 +00004938/// Returns a NamedDecl iff typo correction was performed and substituting in
Kaelyn Uhrain2afd7662011-10-11 00:28:39 +00004939/// the new declaration name does not cause new errors.
4940static NamedDecl* DiagnoseInvalidRedeclaration(
Kaelyn Uhrainf09ce392011-10-11 00:28:52 +00004941 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD,
Kaelyn Uhrain2afd7662011-10-11 00:28:39 +00004942 ActOnFDArgs &ExtraArgs) {
Kaelyn Uhrain2afd7662011-10-11 00:28:39 +00004943 NamedDecl *Result = NULL;
Kaelyn Uhrain51611632011-08-18 18:19:12 +00004944 DeclarationName Name = NewFD->getDeclName();
Kaelyn Uhrain2afd7662011-10-11 00:28:39 +00004945 DeclContext *NewDC = NewFD->getDeclContext();
Kaelyn Uhrainf09ce392011-10-11 00:28:52 +00004946 LookupResult Prev(SemaRef, Name, NewFD->getLocation(),
John McCall29ae6e52010-10-13 05:45:15 +00004947 Sema::LookupOrdinaryName, Sema::ForRedeclaration);
Kaelyn Uhrain4d9d1572011-08-04 17:40:00 +00004948 llvm::SmallVector<unsigned, 1> MismatchedParams;
Kaelyn Uhrain51611632011-08-18 18:19:12 +00004949 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches;
4950 TypoCorrection Correction;
David Blaikie4e4d0842012-03-11 07:00:24 +00004951 bool isFriendDecl = (SemaRef.getLangOpts().CPlusPlus &&
Kaelyn Uhrainf09ce392011-10-11 00:28:52 +00004952 ExtraArgs.D.getDeclSpec().isFriendSpecified());
Kaelyn Uhrain51611632011-08-18 18:19:12 +00004953 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend
4954 : diag::err_member_def_does_not_match;
4955
4956 NewFD->setInvalidDecl();
Kaelyn Uhrainf09ce392011-10-11 00:28:52 +00004957 SemaRef.LookupQualifiedName(Prev, NewDC);
John McCall29ae6e52010-10-13 05:45:15 +00004958 assert(!Prev.isAmbiguous() &&
4959 "Cannot have an ambiguity in previous-declaration lookup");
Kaelyn Uhrain33363532012-02-16 22:40:59 +00004960 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD);
Kaelyn Uhrainef094a12012-06-07 23:57:08 +00004961 DifferentNameValidatorCCC Validator(SemaRef.Context, NewFD,
4962 MD ? MD->getParent() : 0);
Kaelyn Uhrain51611632011-08-18 18:19:12 +00004963 if (!Prev.empty()) {
4964 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end();
4965 Func != FuncEnd; ++Func) {
4966 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func);
Kaelyn Uhrainf09ce392011-10-11 00:28:52 +00004967 if (FD &&
4968 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) {
Kaelyn Uhrain51611632011-08-18 18:19:12 +00004969 // Add 1 to the index so that 0 can mean the mismatch didn't
4970 // involve a parameter
4971 unsigned ParamNum =
4972 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1;
4973 NearMatches.push_back(std::make_pair(FD, ParamNum));
4974 }
Kaelyn Uhrain4d9d1572011-08-04 17:40:00 +00004975 }
Kaelyn Uhrain51611632011-08-18 18:19:12 +00004976 // If the qualified name lookup yielded nothing, try typo correction
Kaelyn Uhrainf09ce392011-10-11 00:28:52 +00004977 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(),
Kaelyn Uhrain43e875d2012-01-18 21:41:41 +00004978 Prev.getLookupKind(), 0, 0,
Kaelyn Uhrain16e46dd2012-01-31 23:49:25 +00004979 Validator, NewDC))) {
Kaelyn Uhrain2afd7662011-10-11 00:28:39 +00004980 // Trap errors.
Kaelyn Uhrainf09ce392011-10-11 00:28:52 +00004981 Sema::SFINAETrap Trap(SemaRef);
Kaelyn Uhrain2afd7662011-10-11 00:28:39 +00004982
4983 // Set up everything for the call to ActOnFunctionDeclarator
4984 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(),
4985 ExtraArgs.D.getIdentifierLoc());
4986 Previous.clear();
4987 Previous.setLookupName(Correction.getCorrection());
Kaelyn Uhrain51611632011-08-18 18:19:12 +00004988 for (TypoCorrection::decl_iterator CDecl = Correction.begin(),
4989 CDeclEnd = Correction.end();
4990 CDecl != CDeclEnd; ++CDecl) {
4991 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl);
Kaelyn Uhrainef094a12012-06-07 23:57:08 +00004992 if (FD && !FD->hasBody() &&
4993 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) {
Kaelyn Uhrain2afd7662011-10-11 00:28:39 +00004994 Previous.addDecl(FD);
Kaelyn Uhrain51611632011-08-18 18:19:12 +00004995 }
4996 }
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00004997 bool wasRedeclaration = ExtraArgs.D.isRedeclaration();
Kaelyn Uhrain2afd7662011-10-11 00:28:39 +00004998 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the
4999 // pieces need to verify the typo-corrected C++ declaraction and hopefully
5000 // eliminate the need for the parameter pack ExtraArgs.
Kaelyn Uhrain6d858d92012-04-03 18:20:11 +00005001 Result = SemaRef.ActOnFunctionDeclarator(
5002 ExtraArgs.S, ExtraArgs.D,
5003 Correction.getCorrectionDecl()->getDeclContext(),
5004 NewFD->getTypeSourceInfo(), Previous, ExtraArgs.TemplateParamLists,
5005 ExtraArgs.AddToScope);
Kaelyn Uhrain2afd7662011-10-11 00:28:39 +00005006 if (Trap.hasErrorOccurred()) {
5007 // Pretend the typo correction never occurred
5008 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(),
5009 ExtraArgs.D.getIdentifierLoc());
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00005010 ExtraArgs.D.setRedeclaration(wasRedeclaration);
Kaelyn Uhrain2afd7662011-10-11 00:28:39 +00005011 Previous.clear();
5012 Previous.setLookupName(Name);
5013 Result = NULL;
5014 } else {
5015 for (LookupResult::iterator Func = Previous.begin(),
5016 FuncEnd = Previous.end();
5017 Func != FuncEnd; ++Func) {
5018 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func))
5019 NearMatches.push_back(std::make_pair(FD, 0));
5020 }
5021 }
5022 if (NearMatches.empty()) {
5023 // Ignore the correction if it didn't yield any close FunctionDecl matches
5024 Correction = TypoCorrection();
5025 } else {
Kaelyn Uhrain7c243342011-09-14 19:37:32 +00005026 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest
5027 : diag::err_member_def_does_not_match_suggest;
Kaelyn Uhrain2afd7662011-10-11 00:28:39 +00005028 }
Kaelyn Uhrain51611632011-08-18 18:19:12 +00005029 }
5030
Kaelyn Uhrainb7fe5792012-06-07 23:57:12 +00005031 if (Correction) {
David Blaikie6952c012012-10-12 20:00:44 +00005032 // FIXME: use Correction.getCorrectionRange() instead of computing the range
5033 // here. This requires passing in the CXXScopeSpec to CorrectTypo which in
5034 // turn causes the correction to fully qualify the name. If we fix
5035 // CorrectTypo to minimally qualify then this change should be good.
Kaelyn Uhrainb7fe5792012-06-07 23:57:12 +00005036 SourceRange FixItLoc(NewFD->getLocation());
5037 CXXScopeSpec &SS = ExtraArgs.D.getCXXScopeSpec();
5038 if (Correction.getCorrectionSpecifier() && SS.isValid())
5039 FixItLoc.setBegin(SS.getBeginLoc());
5040 SemaRef.Diag(NewFD->getLocStart(), DiagMsg)
David Blaikie4e4d0842012-03-11 07:00:24 +00005041 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOpts())
Kaelyn Uhrain51611632011-08-18 18:19:12 +00005042 << FixItHint::CreateReplacement(
Kaelyn Uhrainb7fe5792012-06-07 23:57:12 +00005043 FixItLoc, Correction.getAsString(SemaRef.getLangOpts()));
5044 } else {
Kaelyn Uhrainf09ce392011-10-11 00:28:52 +00005045 SemaRef.Diag(NewFD->getLocation(), DiagMsg)
5046 << Name << NewDC << NewFD->getLocation();
Kaelyn Uhrainb7fe5792012-06-07 23:57:12 +00005047 }
Kaelyn Uhrain51611632011-08-18 18:19:12 +00005048
Kaelyn Uhrain10553932011-10-10 18:01:37 +00005049 bool NewFDisConst = false;
5050 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD))
David Blaikie4ef832f2012-08-10 00:55:35 +00005051 NewFDisConst = NewMD->isConst();
Kaelyn Uhrain10553932011-10-10 18:01:37 +00005052
Kaelyn Uhrain51611632011-08-18 18:19:12 +00005053 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator
5054 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end();
5055 NearMatch != NearMatchEnd; ++NearMatch) {
5056 FunctionDecl *FD = NearMatch->first;
Kaelyn Uhrain10553932011-10-10 18:01:37 +00005057 bool FDisConst = false;
5058 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD))
David Blaikie4ef832f2012-08-10 00:55:35 +00005059 FDisConst = MD->isConst();
Kaelyn Uhrain51611632011-08-18 18:19:12 +00005060
5061 if (unsigned Idx = NearMatch->second) {
5062 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1);
Richard Smith1c931be2012-04-02 18:40:40 +00005063 SourceLocation Loc = FDParam->getTypeSpecStartLoc();
5064 if (Loc.isInvalid()) Loc = FD->getLocation();
5065 SemaRef.Diag(Loc, diag::note_member_def_close_param_match)
Kaelyn Uhrain51611632011-08-18 18:19:12 +00005066 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType();
5067 } else if (Correction) {
Kaelyn Uhrainf09ce392011-10-11 00:28:52 +00005068 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl)
David Blaikie4e4d0842012-03-11 07:00:24 +00005069 << Correction.getQuoted(SemaRef.getLangOpts());
Kaelyn Uhrain10553932011-10-10 18:01:37 +00005070 } else if (FDisConst != NewFDisConst) {
Kaelyn Uhrainf09ce392011-10-11 00:28:52 +00005071 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match)
Kaelyn Uhrain10553932011-10-10 18:01:37 +00005072 << NewFDisConst << FD->getSourceRange().getEnd();
Kaelyn Uhrain51611632011-08-18 18:19:12 +00005073 } else
Kaelyn Uhrainf09ce392011-10-11 00:28:52 +00005074 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match);
John McCall29ae6e52010-10-13 05:45:15 +00005075 }
Kaelyn Uhrain2afd7662011-10-11 00:28:39 +00005076 return Result;
John McCall29ae6e52010-10-13 05:45:15 +00005077}
5078
David Blaikied662a792011-10-19 22:56:21 +00005079static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef,
5080 Declarator &D) {
Kaelyn Uhraind7e19ce2011-10-11 00:28:49 +00005081 switch (D.getDeclSpec().getStorageClassSpec()) {
5082 default: llvm_unreachable("Unknown storage class!");
5083 case DeclSpec::SCS_auto:
5084 case DeclSpec::SCS_register:
5085 case DeclSpec::SCS_mutable:
5086 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(),
5087 diag::err_typecheck_sclass_func);
5088 D.setInvalidType();
5089 break;
5090 case DeclSpec::SCS_unspecified: break;
5091 case DeclSpec::SCS_extern: return SC_Extern;
5092 case DeclSpec::SCS_static: {
5093 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) {
5094 // C99 6.7.1p5:
5095 // The declaration of an identifier for a function that has
5096 // block scope shall have no explicit storage-class specifier
5097 // other than extern
5098 // See also (C++ [dcl.stc]p4).
5099 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(),
5100 diag::err_static_block_func);
5101 break;
5102 } else
5103 return SC_Static;
5104 }
5105 case DeclSpec::SCS_private_extern: return SC_PrivateExtern;
5106 }
5107
5108 // No explicit storage class has already been returned
5109 return SC_None;
5110}
5111
5112static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D,
5113 DeclContext *DC, QualType &R,
5114 TypeSourceInfo *TInfo,
5115 FunctionDecl::StorageClass SC,
5116 bool &IsVirtualOkay) {
5117 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D);
5118 DeclarationName Name = NameInfo.getName();
5119
5120 FunctionDecl *NewFD = 0;
5121 bool isInline = D.getDeclSpec().isInlineSpecified();
5122 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten();
5123 FunctionDecl::StorageClass SCAsWritten
5124 = StorageClassSpecToFunctionDeclStorageClass(SCSpec);
5125
David Blaikie4e4d0842012-03-11 07:00:24 +00005126 if (!SemaRef.getLangOpts().CPlusPlus) {
Kaelyn Uhraind7e19ce2011-10-11 00:28:49 +00005127 // Determine whether the function was written with a
5128 // prototype. This true when:
5129 // - there is a prototype in the declarator, or
5130 // - the type R of the function is some kind of typedef or other reference
5131 // to a type name (which eventually refers to a function type).
5132 bool HasPrototype =
5133 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) ||
5134 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType());
5135
David Blaikied662a792011-10-19 22:56:21 +00005136 NewFD = FunctionDecl::Create(SemaRef.Context, DC,
Daniel Dunbar96a00142012-03-09 18:35:03 +00005137 D.getLocStart(), NameInfo, R,
David Blaikied662a792011-10-19 22:56:21 +00005138 TInfo, SC, SCAsWritten, isInline,
Kaelyn Uhraind7e19ce2011-10-11 00:28:49 +00005139 HasPrototype);
5140 if (D.isInvalidType())
5141 NewFD->setInvalidDecl();
5142
5143 // Set the lexical context.
5144 NewFD->setLexicalDeclContext(SemaRef.CurContext);
5145
5146 return NewFD;
5147 }
5148
5149 bool isExplicit = D.getDeclSpec().isExplicitSpecified();
5150 bool isConstexpr = D.getDeclSpec().isConstexprSpecified();
5151
5152 // Check that the return type is not an abstract class type.
5153 // For record types, this is done by the AbstractClassUsageDiagnoser once
5154 // the class has been completely parsed.
5155 if (!DC->isRecord() &&
5156 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(),
5157 R->getAs<FunctionType>()->getResultType(),
5158 diag::err_abstract_type_in_decl,
5159 SemaRef.AbstractReturnType))
5160 D.setInvalidType();
5161
5162 if (Name.getNameKind() == DeclarationName::CXXConstructorName) {
5163 // This is a C++ constructor declaration.
5164 assert(DC->isRecord() &&
5165 "Constructors can only be declared in a member context");
5166
5167 R = SemaRef.CheckConstructorDeclarator(D, R, SC);
5168 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC),
Daniel Dunbar96a00142012-03-09 18:35:03 +00005169 D.getLocStart(), NameInfo,
Kaelyn Uhraind7e19ce2011-10-11 00:28:49 +00005170 R, TInfo, isExplicit, isInline,
5171 /*isImplicitlyDeclared=*/false,
5172 isConstexpr);
5173
5174 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
5175 // This is a C++ destructor declaration.
5176 if (DC->isRecord()) {
5177 R = SemaRef.CheckDestructorDeclarator(D, R, SC);
5178 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC);
5179 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create(
5180 SemaRef.Context, Record,
Daniel Dunbar96a00142012-03-09 18:35:03 +00005181 D.getLocStart(),
Kaelyn Uhraind7e19ce2011-10-11 00:28:49 +00005182 NameInfo, R, TInfo, isInline,
5183 /*isImplicitlyDeclared=*/false);
5184
5185 // If the class is complete, then we now create the implicit exception
5186 // specification. If the class is incomplete or dependent, we can't do
5187 // it yet.
David Blaikie4e4d0842012-03-11 07:00:24 +00005188 if (SemaRef.getLangOpts().CPlusPlus0x && !Record->isDependentType() &&
Kaelyn Uhraind7e19ce2011-10-11 00:28:49 +00005189 Record->getDefinition() && !Record->isBeingDefined() &&
5190 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) {
5191 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD);
5192 }
5193
5194 IsVirtualOkay = true;
5195 return NewDD;
5196
5197 } else {
5198 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member);
5199 D.setInvalidType();
5200
5201 // Create a FunctionDecl to satisfy the function definition parsing
5202 // code path.
5203 return FunctionDecl::Create(SemaRef.Context, DC,
Daniel Dunbar96a00142012-03-09 18:35:03 +00005204 D.getLocStart(),
Kaelyn Uhraind7e19ce2011-10-11 00:28:49 +00005205 D.getIdentifierLoc(), Name, R, TInfo,
5206 SC, SCAsWritten, isInline,
5207 /*hasPrototype=*/true, isConstexpr);
5208 }
5209
5210 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) {
5211 if (!DC->isRecord()) {
5212 SemaRef.Diag(D.getIdentifierLoc(),
5213 diag::err_conv_function_not_member);
5214 return 0;
5215 }
5216
5217 SemaRef.CheckConversionDeclarator(D, R, SC);
5218 IsVirtualOkay = true;
5219 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC),
Daniel Dunbar96a00142012-03-09 18:35:03 +00005220 D.getLocStart(), NameInfo,
Kaelyn Uhraind7e19ce2011-10-11 00:28:49 +00005221 R, TInfo, isInline, isExplicit,
5222 isConstexpr, SourceLocation());
5223
5224 } else if (DC->isRecord()) {
5225 // If the name of the function is the same as the name of the record,
5226 // then this must be an invalid constructor that has a return type.
5227 // (The parser checks for a return type and makes the declarator a
5228 // constructor if it has no return type).
5229 if (Name.getAsIdentifierInfo() &&
5230 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){
5231 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type)
5232 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
5233 << SourceRange(D.getIdentifierLoc());
5234 return 0;
5235 }
5236
5237 bool isStatic = SC == SC_Static;
5238
5239 // [class.free]p1:
5240 // Any allocation function for a class T is a static member
5241 // (even if not explicitly declared static).
5242 if (Name.getCXXOverloadedOperator() == OO_New ||
5243 Name.getCXXOverloadedOperator() == OO_Array_New)
5244 isStatic = true;
5245
5246 // [class.free]p6 Any deallocation function for a class X is a static member
5247 // (even if not explicitly declared static).
5248 if (Name.getCXXOverloadedOperator() == OO_Delete ||
5249 Name.getCXXOverloadedOperator() == OO_Array_Delete)
5250 isStatic = true;
5251
5252 IsVirtualOkay = !isStatic;
5253
5254 // This is a C++ method declaration.
5255 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC),
Daniel Dunbar96a00142012-03-09 18:35:03 +00005256 D.getLocStart(), NameInfo, R,
Kaelyn Uhraind7e19ce2011-10-11 00:28:49 +00005257 TInfo, isStatic, SCAsWritten, isInline,
5258 isConstexpr, SourceLocation());
5259
5260 } else {
5261 // Determine whether the function was written with a
5262 // prototype. This true when:
5263 // - we're in C++ (where every function has a prototype),
5264 return FunctionDecl::Create(SemaRef.Context, DC,
Daniel Dunbar96a00142012-03-09 18:35:03 +00005265 D.getLocStart(),
Kaelyn Uhraind7e19ce2011-10-11 00:28:49 +00005266 NameInfo, R, TInfo, SC, SCAsWritten, isInline,
5267 true/*HasPrototype*/, isConstexpr);
5268 }
5269}
5270
Eli Friedman7c3c6bc2012-09-20 01:40:23 +00005271void Sema::checkVoidParamDecl(ParmVarDecl *Param) {
5272 // In C++, the empty parameter-type-list must be spelled "void"; a
5273 // typedef of void is not permitted.
5274 if (getLangOpts().CPlusPlus &&
5275 Param->getType().getUnqualifiedType() != Context.VoidTy) {
5276 bool IsTypeAlias = false;
5277 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>())
5278 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl());
5279 else if (const TemplateSpecializationType *TST =
5280 Param->getType()->getAs<TemplateSpecializationType>())
5281 IsTypeAlias = TST->isTypeAlias();
5282 Diag(Param->getLocation(), diag::err_param_typedef_of_void)
5283 << IsTypeAlias;
5284 }
5285}
5286
Mike Stump1eb44332009-09-09 15:08:12 +00005287NamedDecl*
Nick Lewycky25af0912011-07-02 02:05:12 +00005288Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC,
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00005289 TypeSourceInfo *TInfo, LookupResult &Previous,
Douglas Gregore542c862009-06-23 23:11:28 +00005290 MultiTemplateParamsArg TemplateParamLists,
Francois Pichetaf0f4d02011-08-14 03:52:19 +00005291 bool &AddToScope) {
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00005292 QualType R = TInfo->getType();
5293
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00005294 assert(R.getTypePtr()->isFunctionType());
5295
Abramo Bagnara25777432010-08-11 22:01:17 +00005296 // TODO: consider using NameInfo for diagnostic.
5297 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
5298 DeclarationName Name = NameInfo.getName();
Kaelyn Uhraind7e19ce2011-10-11 00:28:49 +00005299 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D);
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00005300
Eli Friedman63054b32009-04-19 20:27:55 +00005301 if (D.getDeclSpec().isThreadSpecified())
5302 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
5303
Chris Lattnerbb749822009-04-11 19:17:25 +00005304 // Do not allow returning a objc interface by-value.
John McCallc12c5bb2010-05-15 11:32:37 +00005305 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) {
Chris Lattnerbb749822009-04-11 19:17:25 +00005306 Diag(D.getIdentifierLoc(),
5307 diag::err_object_cannot_be_passed_returned_by_value) << 0
Fariborz Jahanian8eaefdc2011-07-26 17:58:54 +00005308 << R->getAs<FunctionType>()->getResultType()
5309 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*");
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +00005310
Fariborz Jahanian8eaefdc2011-07-26 17:58:54 +00005311 QualType T = R->getAs<FunctionType>()->getResultType();
5312 T = Context.getObjCObjectPointerType(T);
5313 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) {
5314 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
5315 R = Context.getFunctionType(T, FPT->arg_type_begin(),
5316 FPT->getNumArgs(), EPI);
5317 }
5318 else if (isa<FunctionNoProtoType>(R))
5319 R = Context.getFunctionNoProtoType(T);
Chris Lattnerbb749822009-04-11 19:17:25 +00005320 }
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +00005321
Douglas Gregor3922ed02010-12-10 19:28:19 +00005322 bool isFriend = false;
Douglas Gregor3922ed02010-12-10 19:28:19 +00005323 FunctionTemplateDecl *FunctionTemplate = 0;
5324 bool isExplicitSpecialization = false;
5325 bool isFunctionTemplateSpecialization = false;
Nico Weber6b020092012-06-25 17:21:05 +00005326
Francois Pichetaf0f4d02011-08-14 03:52:19 +00005327 bool isDependentClassScopeExplicitSpecialization = false;
Nico Weber6b020092012-06-25 17:21:05 +00005328 bool HasExplicitTemplateArgs = false;
5329 TemplateArgumentListInfo TemplateArgs;
5330
Kaelyn Uhraind7e19ce2011-10-11 00:28:49 +00005331 bool isVirtualOkay = false;
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005332
Kaelyn Uhraind7e19ce2011-10-11 00:28:49 +00005333 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC,
5334 isVirtualOkay);
5335 if (!NewFD) return 0;
5336
Argyrios Kyrtzidisc14a03d2011-11-23 20:27:36 +00005337 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer())
5338 NewFD->setTopLevelDeclInObjCContainer();
5339
David Blaikie4e4d0842012-03-11 07:00:24 +00005340 if (getLangOpts().CPlusPlus) {
Kaelyn Uhraind7e19ce2011-10-11 00:28:49 +00005341 bool isInline = D.getDeclSpec().isInlineSpecified();
Douglas Gregor3922ed02010-12-10 19:28:19 +00005342 bool isVirtual = D.getDeclSpec().isVirtualSpecified();
5343 bool isExplicit = D.getDeclSpec().isExplicitSpecified();
Richard Smithaf1fc7a2011-08-15 21:04:07 +00005344 bool isConstexpr = D.getDeclSpec().isConstexprSpecified();
Kaelyn Uhraind7e19ce2011-10-11 00:28:49 +00005345 isFriend = D.getDeclSpec().isFriendSpecified();
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00005346 if (isFriend && !isInline && D.isFunctionDefinition()) {
Abramo Bagnarab0a2fcc2011-03-18 15:21:59 +00005347 // C++ [class.friend]p5
5348 // A function can be defined in a friend declaration of a
5349 // class . . . . Such a function is implicitly inline.
5350 NewFD->setImplicitlyInline();
5351 }
5352
John McCalle402e722012-09-25 07:32:39 +00005353 // If this is a method defined in an __interface, and is not a constructor
5354 // or an overloaded operator, then set the pure flag (isVirtual will already
5355 // return true).
5356 if (const CXXRecordDecl *Parent =
5357 dyn_cast<CXXRecordDecl>(NewFD->getDeclContext())) {
5358 if (Parent->isInterface() && cast<CXXMethodDecl>(NewFD)->isUserProvided())
Joao Matos6666ed42012-08-31 18:45:21 +00005359 NewFD->setPure(true);
5360 }
5361
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005362 SetNestedNameSpecifier(NewFD, D);
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005363 isExplicitSpecialization = false;
5364 isFunctionTemplateSpecialization = false;
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005365 if (D.isInvalidType())
5366 NewFD->setInvalidDecl();
5367
5368 // Set the lexical context. If the declarator has a C++
5369 // scope specifier, or is the object of a friend declaration, the
5370 // lexical context will be different from the semantic context.
5371 NewFD->setLexicalDeclContext(CurContext);
Douglas Gregor45fa5602011-11-07 20:56:01 +00005372
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005373 // Match up the template parameter lists with the scope specifier, then
5374 // determine whether we have a template or a template specialization.
5375 bool Invalid = false;
5376 if (TemplateParameterList *TemplateParams
Douglas Gregorcb710a42011-03-04 22:45:55 +00005377 = MatchTemplateParametersToScopeSpecifier(
Daniel Dunbar96a00142012-03-09 18:35:03 +00005378 D.getDeclSpec().getLocStart(),
Douglas Gregorc8406492011-05-10 18:27:06 +00005379 D.getIdentifierLoc(),
Douglas Gregorf59a56e2009-07-21 23:53:31 +00005380 D.getCXXScopeSpec(),
Benjamin Kramer5354e772012-08-23 23:38:35 +00005381 TemplateParamLists.data(),
John McCall6102ca12010-10-16 06:59:13 +00005382 TemplateParamLists.size(),
5383 isFriend,
5384 isExplicitSpecialization,
5385 Invalid)) {
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005386 if (TemplateParams->size() > 0) {
5387 // This is a function template
Abramo Bagnara9b934882010-06-12 08:15:14 +00005388
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005389 // Check that we can declare a template here.
5390 if (CheckTemplateDeclScope(S, TemplateParams))
5391 return 0;
Mike Stump1eb44332009-09-09 15:08:12 +00005392
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005393 // A destructor cannot be a template.
5394 if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
5395 Diag(NewFD->getLocation(), diag::err_destructor_template);
5396 return 0;
John McCall5fd378b2010-03-24 08:27:58 +00005397 }
Douglas Gregor20606502011-10-14 15:31:12 +00005398
5399 // If we're adding a template to a dependent context, we may need to
David Blaikied662a792011-10-19 22:56:21 +00005400 // rebuilding some of the types used within the template parameter list,
Douglas Gregor20606502011-10-14 15:31:12 +00005401 // now that we know what the current instantiation is.
5402 if (DC->isDependentContext()) {
5403 ContextRAII SavedContext(*this, DC);
5404 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams))
5405 Invalid = true;
5406 }
5407
John McCall5fd378b2010-03-24 08:27:58 +00005408
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005409 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC,
5410 NewFD->getLocation(),
5411 Name, TemplateParams,
5412 NewFD);
5413 FunctionTemplate->setLexicalDeclContext(CurContext);
5414 NewFD->setDescribedFunctionTemplate(FunctionTemplate);
5415
5416 // For source fidelity, store the other template param lists.
5417 if (TemplateParamLists.size() > 1) {
5418 NewFD->setTemplateParameterListsInfo(Context,
5419 TemplateParamLists.size() - 1,
Benjamin Kramer5354e772012-08-23 23:38:35 +00005420 TemplateParamLists.data());
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005421 }
5422 } else {
5423 // This is a function template specialization.
5424 isFunctionTemplateSpecialization = true;
5425 // For source fidelity, store all the template param lists.
5426 NewFD->setTemplateParameterListsInfo(Context,
5427 TemplateParamLists.size(),
Benjamin Kramer5354e772012-08-23 23:38:35 +00005428 TemplateParamLists.data());
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005429
5430 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);".
5431 if (isFriend) {
5432 // We want to remove the "template<>", found here.
5433 SourceRange RemoveRange = TemplateParams->getSourceRange();
5434
5435 // If we remove the template<> and the name is not a
5436 // template-id, we're actually silently creating a problem:
5437 // the friend declaration will refer to an untemplated decl,
5438 // and clearly the user wants a template specialization. So
5439 // we need to insert '<>' after the name.
5440 SourceLocation InsertLoc;
5441 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) {
5442 InsertLoc = D.getName().getSourceRange().getEnd();
5443 InsertLoc = PP.getLocForEndOfToken(InsertLoc);
5444 }
5445
5446 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend)
5447 << Name << RemoveRange
5448 << FixItHint::CreateRemoval(RemoveRange)
5449 << FixItHint::CreateInsertion(InsertLoc, "<>");
5450 }
5451 }
5452 }
5453 else {
5454 // All template param lists were matched against the scope specifier:
5455 // this is NOT (an explicit specialization of) a template.
5456 if (TemplateParamLists.size() > 0)
5457 // For source fidelity, store all the template param lists.
5458 NewFD->setTemplateParameterListsInfo(Context,
5459 TemplateParamLists.size(),
Benjamin Kramer5354e772012-08-23 23:38:35 +00005460 TemplateParamLists.data());
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005461 }
5462
5463 if (Invalid) {
5464 NewFD->setInvalidDecl();
5465 if (FunctionTemplate)
5466 FunctionTemplate->setInvalidDecl();
5467 }
Kaelyn Uhraind7e19ce2011-10-11 00:28:49 +00005468
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005469 // C++ [dcl.fct.spec]p5:
5470 // The virtual specifier shall only be used in declarations of
5471 // nonstatic class member functions that appear within a
5472 // member-specification of a class declaration; see 10.3.
5473 //
5474 if (isVirtual && !NewFD->isInvalidDecl()) {
5475 if (!isVirtualOkay) {
5476 Diag(D.getDeclSpec().getVirtualSpecLoc(),
5477 diag::err_virtual_non_function);
5478 } else if (!CurContext->isRecord()) {
5479 // 'virtual' was specified outside of the class.
Anders Carlssonf1602a52011-01-22 14:43:56 +00005480 Diag(D.getDeclSpec().getVirtualSpecLoc(),
5481 diag::err_virtual_out_of_class)
5482 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc());
5483 } else if (NewFD->getDescribedFunctionTemplate()) {
5484 // C++ [temp.mem]p3:
5485 // A member function template shall not be virtual.
5486 Diag(D.getDeclSpec().getVirtualSpecLoc(),
5487 diag::err_virtual_member_function_template)
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005488 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc());
5489 } else {
5490 // Okay: Add virtual to the method.
5491 NewFD->setVirtualAsWritten(true);
John McCall7ad650f2010-03-24 07:46:06 +00005492 }
Douglas Gregorc5c903a2009-06-24 00:23:40 +00005493 }
Abramo Bagnara9b934882010-06-12 08:15:14 +00005494
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005495 // C++ [dcl.fct.spec]p3:
David Blaikied662a792011-10-19 22:56:21 +00005496 // The inline specifier shall not appear on a block scope function
5497 // declaration.
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005498 if (isInline && !NewFD->isInvalidDecl()) {
5499 if (CurContext->isFunctionOrMethod()) {
5500 // 'inline' is not allowed on block scope function declaration.
5501 Diag(D.getDeclSpec().getInlineSpecLoc(),
5502 diag::err_inline_declaration_block_scope) << Name
5503 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc());
5504 }
5505 }
Kaelyn Uhraind7e19ce2011-10-11 00:28:49 +00005506
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005507 // C++ [dcl.fct.spec]p6:
5508 // The explicit specifier shall be used only in the declaration of a
David Blaikied662a792011-10-19 22:56:21 +00005509 // constructor or conversion function within its class definition;
5510 // see 12.3.1 and 12.3.2.
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005511 if (isExplicit && !NewFD->isInvalidDecl()) {
5512 if (!CurContext->isRecord()) {
5513 // 'explicit' was specified outside of the class.
5514 Diag(D.getDeclSpec().getExplicitSpecLoc(),
5515 diag::err_explicit_out_of_class)
5516 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc());
5517 } else if (!isa<CXXConstructorDecl>(NewFD) &&
5518 !isa<CXXConversionDecl>(NewFD)) {
5519 // 'explicit' was specified on a function that wasn't a constructor
5520 // or conversion function.
5521 Diag(D.getDeclSpec().getExplicitSpecLoc(),
5522 diag::err_explicit_non_ctor_or_conv_function)
5523 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc());
5524 }
5525 }
Abramo Bagnara9b934882010-06-12 08:15:14 +00005526
Richard Smithaf1fc7a2011-08-15 21:04:07 +00005527 if (isConstexpr) {
5528 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors
5529 // are implicitly inline.
5530 NewFD->setImplicitlyInline();
5531
Richard Smithaf1fc7a2011-08-15 21:04:07 +00005532 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to
5533 // be either constructors or to return a literal type. Therefore,
5534 // destructors cannot be declared constexpr.
5535 if (isa<CXXDestructorDecl>(NewFD))
Richard Smith9f569cc2011-10-01 02:31:28 +00005536 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor);
Richard Smithaf1fc7a2011-08-15 21:04:07 +00005537 }
5538
Douglas Gregor8d267c52011-09-09 02:06:17 +00005539 // If __module_private__ was specified, mark the function accordingly.
5540 if (D.getDeclSpec().isModulePrivateSpecified()) {
Douglas Gregord023aec2011-09-09 20:53:38 +00005541 if (isFunctionTemplateSpecialization) {
5542 SourceLocation ModulePrivateLoc
5543 = D.getDeclSpec().getModulePrivateSpecLoc();
5544 Diag(ModulePrivateLoc, diag::err_module_private_specialization)
5545 << 0
5546 << FixItHint::CreateRemoval(ModulePrivateLoc);
5547 } else {
5548 NewFD->setModulePrivate();
5549 if (FunctionTemplate)
5550 FunctionTemplate->setModulePrivate();
5551 }
Douglas Gregor8d267c52011-09-09 02:06:17 +00005552 }
Richard Smithaf1fc7a2011-08-15 21:04:07 +00005553
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005554 if (isFriend) {
5555 // For now, claim that the objects have no previous declaration.
5556 if (FunctionTemplate) {
5557 FunctionTemplate->setObjectOfFriendDecl(false);
5558 FunctionTemplate->setAccess(AS_public);
5559 }
5560 NewFD->setObjectOfFriendDecl(false);
5561 NewFD->setAccess(AS_public);
5562 }
5563
Douglas Gregor45fa5602011-11-07 20:56:01 +00005564 // If a function is defined as defaulted or deleted, mark it as such now.
5565 switch (D.getFunctionDefinitionKind()) {
5566 case FDK_Declaration:
5567 case FDK_Definition:
5568 break;
5569
5570 case FDK_Defaulted:
5571 NewFD->setDefaulted();
5572 break;
5573
5574 case FDK_Deleted:
5575 NewFD->setDeletedAsWritten();
5576 break;
5577 }
5578
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00005579 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext &&
5580 D.isFunctionDefinition()) {
Douglas Gregor45fa5602011-11-07 20:56:01 +00005581 // C++ [class.mfct]p2:
5582 // A member function may be defined (8.4) in its class definition, in
5583 // which case it is an inline member function (7.1.2)
John McCallbfdcdc82010-12-15 04:00:32 +00005584 NewFD->setImplicitlyInline();
5585 }
5586
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005587 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) &&
5588 !CurContext->isRecord()) {
5589 // C++ [class.static]p1:
5590 // A data or function member of a class may be declared static
5591 // in a class definition, in which case it is a static member of
5592 // the class.
5593
5594 // Complain about the 'static' specifier if it's on an out-of-line
5595 // member function definition.
5596 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
5597 diag::err_static_out_of_line)
5598 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
5599 }
Richard Smith444d3842012-10-20 08:26:51 +00005600
5601 // C++11 [except.spec]p15:
5602 // A deallocation function with no exception-specification is treated
5603 // as if it were specified with noexcept(true).
5604 const FunctionProtoType *FPT = R->getAs<FunctionProtoType>();
5605 if ((Name.getCXXOverloadedOperator() == OO_Delete ||
5606 Name.getCXXOverloadedOperator() == OO_Array_Delete) &&
5607 getLangOpts().CPlusPlus0x && FPT && !FPT->hasExceptionSpec()) {
5608 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
5609 EPI.ExceptionSpecType = EST_BasicNoexcept;
5610 NewFD->setType(Context.getFunctionType(FPT->getResultType(),
5611 FPT->arg_type_begin(),
5612 FPT->getNumArgs(), EPI));
5613 }
Douglas Gregor0167f3c2010-07-14 23:14:12 +00005614 }
Kaelyn Uhraind7e19ce2011-10-11 00:28:49 +00005615
5616 // Filter out previous declarations that don't match the scope.
5617 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(),
5618 isExplicitSpecialization ||
5619 isFunctionTemplateSpecialization);
Douglas Gregor0167f3c2010-07-14 23:14:12 +00005620
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00005621 // Handle GNU asm-label extension (encoded as an attribute).
5622 if (Expr *E = (Expr*) D.getAsmLabel()) {
5623 // The parser guarantees this is a string.
Mike Stump1eb44332009-09-09 15:08:12 +00005624 StringLiteral *SE = cast<StringLiteral>(E);
Sean Huntcf807c42010-08-18 23:23:40 +00005625 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context,
5626 SE->getString()));
David Chisnall5f3c1632012-02-18 16:12:34 +00005627 } else if (!ExtnameUndeclaredIdentifiers.empty()) {
5628 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I =
5629 ExtnameUndeclaredIdentifiers.find(NewFD->getIdentifier());
5630 if (I != ExtnameUndeclaredIdentifiers.end()) {
5631 NewFD->addAttr(I->second);
5632 ExtnameUndeclaredIdentifiers.erase(I);
5633 }
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00005634 }
5635
Chris Lattner2dbd2852009-04-25 06:12:16 +00005636 // Copy the parameter declarations from the declarator D to the function
5637 // declaration NewFD, if they are available. First scavenge them into Params.
Chris Lattner5f9e2722011-07-23 10:55:15 +00005638 SmallVector<ParmVarDecl*, 16> Params;
Abramo Bagnara723df242010-12-14 22:11:44 +00005639 if (D.isFunctionDeclarator()) {
Abramo Bagnara075f8f12010-12-10 16:29:40 +00005640 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00005641
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00005642 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs
5643 // function that takes no arguments, not a function that takes a
5644 // single void argument.
5645 // We let through "const void" here because Sema::GetTypeForDeclarator
5646 // already checks for that case.
5647 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 &&
5648 FTI.ArgInfo[0].Param &&
John McCalld226f652010-08-21 09:40:31 +00005649 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) {
Chris Lattner2dbd2852009-04-25 06:12:16 +00005650 // Empty arg list, don't push any params.
Eli Friedman7c3c6bc2012-09-20 01:40:23 +00005651 checkVoidParamDecl(cast<ParmVarDecl>(FTI.ArgInfo[0].Param));
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00005652 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) {
Argyrios Kyrtzidis9bedef62009-07-14 03:18:53 +00005653 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) {
John McCalld226f652010-08-21 09:40:31 +00005654 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param);
Argyrios Kyrtzidis9bedef62009-07-14 03:18:53 +00005655 assert(Param->getDeclContext() != NewFD && "Was set before ?");
5656 Param->setDeclContext(NewFD);
5657 Params.push_back(Param);
John McCallf19de1c2010-04-14 01:27:20 +00005658
5659 if (Param->isInvalidDecl())
5660 NewFD->setInvalidDecl();
Argyrios Kyrtzidis9bedef62009-07-14 03:18:53 +00005661 }
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00005662 }
Mike Stump1eb44332009-09-09 15:08:12 +00005663
John McCall183700f2009-09-21 23:43:11 +00005664 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) {
Chris Lattner1ad9b282009-04-25 06:03:53 +00005665 // When we're declaring a function with a typedef, typeof, etc as in the
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00005666 // following example, we'll need to synthesize (unnamed)
5667 // parameters for use in the declaration.
5668 //
5669 // @code
5670 // typedef void fn(int);
5671 // fn f;
5672 // @endcode
Mike Stump1eb44332009-09-09 15:08:12 +00005673
Chris Lattner1ad9b282009-04-25 06:03:53 +00005674 // Synthesize a parameter for each argument type.
Chris Lattner1ad9b282009-04-25 06:03:53 +00005675 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(),
5676 AE = FT->arg_type_end(); AI != AE; ++AI) {
John McCall82dc0092010-06-04 11:21:44 +00005677 ParmVarDecl *Param =
5678 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI);
John McCallfb44de92011-05-01 22:35:37 +00005679 Param->setScopeInfo(0, Params.size());
Chris Lattner1ad9b282009-04-25 06:03:53 +00005680 Params.push_back(Param);
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00005681 }
Chris Lattner84bb9442009-04-25 18:38:18 +00005682 } else {
5683 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 &&
5684 "Should not need args for typedef of non-prototype fn");
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00005685 }
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +00005686
Chris Lattner2dbd2852009-04-25 06:12:16 +00005687 // Finally, we know we have the right number of parameters, install them.
David Blaikie4278c652011-09-21 18:16:56 +00005688 NewFD->setParams(Params);
Mike Stump1eb44332009-09-09 15:08:12 +00005689
James Molloy16f1f712012-02-29 10:24:19 +00005690 // Find all anonymous symbols defined during the declaration of this function
5691 // and add to NewFD. This lets us track decls such 'enum Y' in:
5692 //
5693 // void f(enum Y {AA} x) {}
5694 //
5695 // which would otherwise incorrectly end up in the translation unit scope.
5696 NewFD->setDeclsInPrototypeScope(DeclsInPrototypeScope);
5697 DeclsInPrototypeScope.clear();
5698
Peter Collingbournec80e8112011-01-21 02:08:54 +00005699 // Process the non-inheritable attributes on this declaration.
5700 ProcessDeclAttributes(S, NewFD, D,
5701 /*NonInheritable=*/true, /*Inheritable=*/false);
5702
Richard Smithb03a9df2012-03-13 05:56:40 +00005703 // Functions returning a variably modified type violate C99 6.7.5.2p2
5704 // because all functions have linkage.
5705 if (!NewFD->isInvalidDecl() &&
5706 NewFD->getResultType()->isVariablyModifiedType()) {
5707 Diag(NewFD->getLocation(), diag::err_vm_func_decl);
5708 NewFD->setInvalidDecl();
5709 }
5710
Rafael Espindola98ae8342012-05-10 02:50:16 +00005711 // Handle attributes.
5712 ProcessDeclAttributes(S, NewFD, D,
5713 /*NonInheritable=*/false, /*Inheritable=*/true);
5714
Kaelyn Uhrain51ceb7b2012-11-12 23:48:05 +00005715 QualType RetType = NewFD->getResultType();
5716 const CXXRecordDecl *Ret = RetType->isRecordType() ?
5717 RetType->getAsCXXRecordDecl() : RetType->getPointeeCXXRecordDecl();
5718 if (!NewFD->isInvalidDecl() && !NewFD->hasAttr<WarnUnusedResultAttr>() &&
5719 Ret && Ret->hasAttr<WarnUnusedResultAttr>()) {
Kaelyn Uhrain97c81bf2012-11-13 21:23:31 +00005720 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD);
5721 if (!(MD && MD->getCorrespondingMethodInClass(Ret, true))) {
5722 NewFD->addAttr(new (Context) WarnUnusedResultAttr(SourceRange(),
5723 Context));
5724 }
Kaelyn Uhrain51ceb7b2012-11-12 23:48:05 +00005725 }
5726
David Blaikie4e4d0842012-03-11 07:00:24 +00005727 if (!getLangOpts().CPlusPlus) {
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005728 // Perform semantic checking on the function declaration.
Douglas Gregor89b9f102011-06-06 15:22:55 +00005729 bool isExplicitSpecialization=false;
David Blaikie14068e82011-09-08 06:33:04 +00005730 if (!NewFD->isInvalidDecl()) {
Richard Smithb03a9df2012-03-13 05:56:40 +00005731 if (NewFD->isMain())
5732 CheckMain(NewFD, D.getDeclSpec());
5733 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous,
5734 isExplicitSpecialization));
David Blaikie14068e82011-09-08 06:33:04 +00005735 }
Fariborz Jahanian37c765a2012-09-05 17:52:12 +00005736 // Make graceful recovery from an invalid redeclaration.
5737 else if (!Previous.empty())
5738 D.setRedeclaration(true);
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00005739 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() ||
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005740 Previous.getResultKind() != LookupResult::FoundOverloaded) &&
5741 "previous declaration set still overloaded");
5742 } else {
5743 // If the declarator is a template-id, translate the parser's template
5744 // argument list into our AST format.
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005745 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) {
5746 TemplateIdAnnotation *TemplateId = D.getName().TemplateId;
5747 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc);
5748 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc);
Benjamin Kramer5354e772012-08-23 23:38:35 +00005749 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005750 TemplateId->NumArgs);
5751 translateTemplateArguments(TemplateArgsPtr,
5752 TemplateArgs);
Douglas Gregor0b60d9e2009-09-25 23:53:26 +00005753
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005754 HasExplicitTemplateArgs = true;
Douglas Gregor0b60d9e2009-09-25 23:53:26 +00005755
Douglas Gregor89b9f102011-06-06 15:22:55 +00005756 if (NewFD->isInvalidDecl()) {
5757 HasExplicitTemplateArgs = false;
5758 } else if (FunctionTemplate) {
Douglas Gregor5505c722011-01-24 18:54:39 +00005759 // Function template with explicit template arguments.
5760 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec)
5761 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc);
5762
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005763 HasExplicitTemplateArgs = false;
5764 } else if (!isFunctionTemplateSpecialization &&
5765 !D.getDeclSpec().isFriendSpecified()) {
5766 // We have encountered something that the user meant to be a
5767 // specialization (because it has explicitly-specified template
5768 // arguments) but that was not introduced with a "template<>" (or had
5769 // too few of them).
5770 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header)
5771 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc)
5772 << FixItHint::CreateInsertion(
Daniel Dunbar96a00142012-03-09 18:35:03 +00005773 D.getDeclSpec().getLocStart(),
David Blaikied662a792011-10-19 22:56:21 +00005774 "template<> ");
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005775 isFunctionTemplateSpecialization = true;
John McCall29ae6e52010-10-13 05:45:15 +00005776 } else {
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005777 // "friend void foo<>(int);" is an implicit specialization decl.
5778 isFunctionTemplateSpecialization = true;
Francois Pichetc71d8eb2010-10-01 21:19:28 +00005779 }
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005780 } else if (isFriend && isFunctionTemplateSpecialization) {
5781 // This combination is only possible in a recovery case; the user
5782 // wrote something like:
5783 // template <> friend void foo(int);
5784 // which we're recovering from as if the user had written:
5785 // friend void foo<>(int);
5786 // Go ahead and fake up a template id.
5787 HasExplicitTemplateArgs = true;
5788 TemplateArgs.setLAngleLoc(D.getIdentifierLoc());
5789 TemplateArgs.setRAngleLoc(D.getIdentifierLoc());
Douglas Gregor2dc0e642009-03-23 23:06:20 +00005790 }
John McCall29ae6e52010-10-13 05:45:15 +00005791
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005792 // If it's a friend (and only if it's a friend), it's possible
5793 // that either the specialized function type or the specialized
5794 // template is dependent, and therefore matching will fail. In
5795 // this case, don't check the specialization yet.
Douglas Gregor33ab0da2011-10-09 20:59:17 +00005796 bool InstantiationDependent = false;
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005797 if (isFunctionTemplateSpecialization && isFriend &&
Douglas Gregor33ab0da2011-10-09 20:59:17 +00005798 (NewFD->getType()->isDependentType() || DC->isDependentContext() ||
5799 TemplateSpecializationType::anyDependentTemplateArguments(
5800 TemplateArgs.getArgumentArray(), TemplateArgs.size(),
5801 InstantiationDependent))) {
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005802 assert(HasExplicitTemplateArgs &&
5803 "friend function specialization without template args");
5804 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs,
5805 Previous))
5806 NewFD->setInvalidDecl();
5807 } else if (isFunctionTemplateSpecialization) {
Douglas Gregoreef7ac52011-03-16 19:27:09 +00005808 if (CurContext->isDependentContext() && CurContext->isRecord()
Francois Pichetab01add2011-06-03 13:59:45 +00005809 && !isFriend) {
Francois Pichetaf0f4d02011-08-14 03:52:19 +00005810 isDependentClassScopeExplicitSpecialization = true;
David Blaikie4e4d0842012-03-11 07:00:24 +00005811 Diag(NewFD->getLocation(), getLangOpts().MicrosoftExt ?
Francois Pichetaf0f4d02011-08-14 03:52:19 +00005812 diag::ext_function_specialization_in_class :
5813 diag::err_function_specialization_in_class)
Douglas Gregoreef7ac52011-03-16 19:27:09 +00005814 << NewFD->getDeclName();
Douglas Gregoreef7ac52011-03-16 19:27:09 +00005815 } else if (CheckFunctionTemplateSpecialization(NewFD,
5816 (HasExplicitTemplateArgs ? &TemplateArgs : 0),
5817 Previous))
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005818 NewFD->setInvalidDecl();
Douglas Gregore885e182011-05-21 18:53:30 +00005819
5820 // C++ [dcl.stc]p1:
5821 // A storage-class-specifier shall not be specified in an explicit
5822 // specialization (14.7.3)
5823 if (SC != SC_None) {
Douglas Gregor0f9dc862011-06-17 05:09:08 +00005824 if (SC != NewFD->getStorageClass())
5825 Diag(NewFD->getLocation(),
5826 diag::err_explicit_specialization_inconsistent_storage_class)
5827 << SC
5828 << FixItHint::CreateRemoval(
5829 D.getDeclSpec().getStorageClassSpecLoc());
5830
5831 else
5832 Diag(NewFD->getLocation(),
5833 diag::ext_explicit_specialization_storage_class)
5834 << FixItHint::CreateRemoval(
5835 D.getDeclSpec().getStorageClassSpecLoc());
Douglas Gregore885e182011-05-21 18:53:30 +00005836 }
5837
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005838 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) {
5839 if (CheckMemberSpecialization(NewFD, Previous))
5840 NewFD->setInvalidDecl();
5841 }
Douglas Gregor2dc0e642009-03-23 23:06:20 +00005842
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005843 // Perform semantic checking on the function declaration.
David Blaikie14068e82011-09-08 06:33:04 +00005844 if (!isDependentClassScopeExplicitSpecialization) {
5845 if (NewFD->isInvalidDecl()) {
5846 // If this is a class member, mark the class invalid immediately.
5847 // This avoids some consistency errors later.
5848 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD))
5849 methodDecl->getParent()->setInvalidDecl();
5850 } else {
5851 if (NewFD->isMain())
5852 CheckMain(NewFD, D.getDeclSpec());
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00005853 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous,
5854 isExplicitSpecialization));
David Blaikie14068e82011-09-08 06:33:04 +00005855 }
5856 }
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005857
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00005858 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() ||
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005859 Previous.getResultKind() != LookupResult::FoundOverloaded) &&
5860 "previous declaration set still overloaded");
5861
5862 NamedDecl *PrincipalDecl = (FunctionTemplate
5863 ? cast<NamedDecl>(FunctionTemplate)
5864 : NewFD);
5865
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00005866 if (isFriend && D.isRedeclaration()) {
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005867 AccessSpecifier Access = AS_public;
5868 if (!NewFD->isInvalidDecl())
Douglas Gregoref96ee02012-01-14 16:38:05 +00005869 Access = NewFD->getPreviousDecl()->getAccess();
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005870
5871 NewFD->setAccess(Access);
5872 if (FunctionTemplate) FunctionTemplate->setAccess(Access);
5873
5874 PrincipalDecl->setObjectOfFriendDecl(true);
5875 }
5876
5877 if (NewFD->isOverloadedOperator() && !DC->isRecord() &&
5878 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary))
5879 PrincipalDecl->setNonMemberOperator();
5880
5881 // If we have a function template, check the template parameter
5882 // list. This will check and merge default template arguments.
5883 if (FunctionTemplate) {
David Blaikied662a792011-10-19 22:56:21 +00005884 FunctionTemplateDecl *PrevTemplate =
Douglas Gregoref96ee02012-01-14 16:38:05 +00005885 FunctionTemplate->getPreviousDecl();
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005886 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(),
David Blaikied662a792011-10-19 22:56:21 +00005887 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0,
Douglas Gregord89d86f2011-02-04 04:20:44 +00005888 D.getDeclSpec().isFriendSpecified()
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00005889 ? (D.isFunctionDefinition()
Douglas Gregord89d86f2011-02-04 04:20:44 +00005890 ? TPC_FriendFunctionTemplateDefinition
5891 : TPC_FriendFunctionTemplate)
5892 : (D.getCXXScopeSpec().isSet() &&
Douglas Gregor461bf2e2011-02-04 12:22:53 +00005893 DC && DC->isRecord() &&
5894 DC->isDependentContext())
Douglas Gregord89d86f2011-02-04 04:20:44 +00005895 ? TPC_ClassTemplateMember
5896 : TPC_FunctionTemplate);
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005897 }
5898
5899 if (NewFD->isInvalidDecl()) {
5900 // Ignore all the rest of this.
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00005901 } else if (!D.isRedeclaration()) {
Kaelyn Uhrainf09ce392011-10-11 00:28:52 +00005902 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists,
Kaelyn Uhrain2afd7662011-10-11 00:28:39 +00005903 AddToScope };
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005904 // Fake up an access specifier if it's supposed to be a class member.
5905 if (isa<CXXRecordDecl>(NewFD->getDeclContext()))
5906 NewFD->setAccess(AS_public);
5907
5908 // Qualified decls generally require a previous declaration.
5909 if (D.getCXXScopeSpec().isSet()) {
5910 // ...with the major exception of templated-scope or
5911 // dependent-scope friend declarations.
5912
5913 // TODO: we currently also suppress this check in dependent
5914 // contexts because (1) the parameter depth will be off when
5915 // matching friend templates and (2) we might actually be
5916 // selecting a friend based on a dependent factor. But there
5917 // are situations where these conditions don't apply and we
5918 // can actually do this check immediately.
5919 if (isFriend &&
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005920 (TemplateParamLists.size() ||
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005921 D.getCXXScopeSpec().getScopeRep()->isDependent() ||
5922 CurContext->isDependentContext())) {
Chandler Carruth47eb2b62011-08-19 01:38:33 +00005923 // ignore these
5924 } else {
5925 // The user tried to provide an out-of-line definition for a
5926 // function that is a member of a class or namespace, but there
5927 // was no such member function declared (C++ [class.mfct]p2,
5928 // C++ [namespace.memdef]p2). For example:
5929 //
5930 // class X {
5931 // void f() const;
5932 // };
5933 //
5934 // void X::f() { } // ill-formed
5935 //
5936 // Complain about this problem, and attempt to suggest close
5937 // matches (e.g., those that differ only in cv-qualifiers and
5938 // whether the parameter types are references).
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005939
Kaelyn Uhrain2afd7662011-10-11 00:28:39 +00005940 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous,
Kaelyn Uhrainf09ce392011-10-11 00:28:52 +00005941 NewFD,
Kaelyn Uhrain2afd7662011-10-11 00:28:39 +00005942 ExtraArgs)) {
Kaelyn Uhrain2afd7662011-10-11 00:28:39 +00005943 AddToScope = ExtraArgs.AddToScope;
5944 return Result;
5945 }
Chandler Carruth47eb2b62011-08-19 01:38:33 +00005946 }
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005947
5948 // Unqualified local friend declarations are required to resolve
5949 // to something.
Chandler Carruth3d095fe2011-08-19 01:40:11 +00005950 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) {
Kaelyn Uhrain2afd7662011-10-11 00:28:39 +00005951 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous,
Kaelyn Uhrainf09ce392011-10-11 00:28:52 +00005952 NewFD,
Kaelyn Uhrain2afd7662011-10-11 00:28:39 +00005953 ExtraArgs)) {
Kaelyn Uhrain2afd7662011-10-11 00:28:39 +00005954 AddToScope = ExtraArgs.AddToScope;
5955 return Result;
5956 }
Chandler Carruth3d095fe2011-08-19 01:40:11 +00005957 }
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005958
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00005959 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() &&
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005960 !isFriend && !isFunctionTemplateSpecialization &&
Sean Hunte4246a62011-05-12 06:15:49 +00005961 !isExplicitSpecialization) {
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005962 // An out-of-line member function declaration must also be a
5963 // definition (C++ [dcl.meaning]p1).
5964 // Note that this is not the case for explicit specializations of
5965 // function templates or member functions of class templates, per
David Blaikied662a792011-10-19 22:56:21 +00005966 // C++ [temp.expl.spec]p2. We also allow these declarations as an
5967 // extension for compatibility with old SWIG code which likes to
5968 // generate them.
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00005969 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration)
5970 << D.getCXXScopeSpec().getRange();
5971 }
5972 }
Ryan Flynn478fbc62009-07-25 22:29:44 +00005973
Douglas Gregor2dc0e642009-03-23 23:06:20 +00005974 AddKnownFunctionAttributes(NewFD);
5975
Douglas Gregord9455382010-08-06 13:50:58 +00005976 if (NewFD->hasAttr<OverloadableAttr>() &&
5977 !NewFD->getType()->getAs<FunctionProtoType>()) {
5978 Diag(NewFD->getLocation(),
5979 diag::err_attribute_overloadable_no_prototype)
5980 << NewFD;
5981
5982 // Turn this into a variadic function with no parameters.
5983 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>();
John McCalle23cf432010-12-14 08:05:40 +00005984 FunctionProtoType::ExtProtoInfo EPI;
5985 EPI.Variadic = true;
5986 EPI.ExtInfo = FT->getExtInfo();
5987
5988 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI);
Douglas Gregord9455382010-08-06 13:50:58 +00005989 NewFD->setType(R);
5990 }
5991
Eli Friedmanaa8b0d12010-08-05 06:57:20 +00005992 // If there's a #pragma GCC visibility in scope, and this isn't a class
5993 // member, set the visibility of this function.
5994 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord())
5995 AddPushedVisibilityAttribute(NewFD);
5996
John McCall8dfac0b2011-09-30 05:12:12 +00005997 // If there's a #pragma clang arc_cf_code_audited in scope, consider
5998 // marking the function.
5999 AddCFAuditedAttribute(NewFD);
6000
Douglas Gregor2dc0e642009-03-23 23:06:20 +00006001 // If this is a locally-scoped extern C function, update the
6002 // map of such names.
Douglas Gregor48a83b52009-09-12 00:17:51 +00006003 if (CurContext->isFunctionOrMethod() && NewFD->isExternC()
Chris Lattnereaaebc72009-04-25 08:06:05 +00006004 && !NewFD->isInvalidDecl())
John McCall68263142009-11-18 22:49:29 +00006005 RegisterLocallyScopedExternCDecl(NewFD, Previous, S);
Douglas Gregor2dc0e642009-03-23 23:06:20 +00006006
Argyrios Kyrtzidis16f19302009-06-25 18:22:24 +00006007 // Set this FunctionDecl's range up to the right paren.
Abramo Bagnaraa2026c92011-03-08 16:41:52 +00006008 NewFD->setRangeEnd(D.getSourceRange().getEnd());
Argyrios Kyrtzidis16f19302009-06-25 18:22:24 +00006009
David Blaikie4e4d0842012-03-11 07:00:24 +00006010 if (getLangOpts().CPlusPlus) {
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00006011 if (FunctionTemplate) {
6012 if (NewFD->isInvalidDecl())
6013 FunctionTemplate->setInvalidDecl();
6014 return FunctionTemplate;
6015 }
Fariborz Jahanianbfe57882010-12-09 23:11:32 +00006016 }
Mike Stump1eb44332009-09-09 15:08:12 +00006017
Tanya Lattner5e94d6f2012-06-19 23:09:52 +00006018 // OpenCL v1.2 s6.8 static is invalid for kernel functions.
6019 if ((getLangOpts().OpenCLVersion >= 120)
6020 && NewFD->hasAttr<OpenCLKernelAttr>()
6021 && (SC == SC_Static)) {
6022 Diag(D.getIdentifierLoc(), diag::err_static_kernel);
6023 D.setInvalidType();
6024 }
6025
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00006026 MarkUnusedFileScopedDecl(NewFD);
Peter Collingbourne14b6ba72011-02-09 21:04:32 +00006027
David Blaikie4e4d0842012-03-11 07:00:24 +00006028 if (getLangOpts().CUDA)
Peter Collingbourne14b6ba72011-02-09 21:04:32 +00006029 if (IdentifierInfo *II = NewFD->getIdentifier())
6030 if (!NewFD->isInvalidDecl() &&
6031 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) {
6032 if (II->isStr("cudaConfigureCall")) {
6033 if (!R->getAs<FunctionType>()->getResultType()->isScalarType())
6034 Diag(NewFD->getLocation(), diag::err_config_scalar_return);
6035
6036 Context.setcudaConfigureCallDecl(NewFD);
6037 }
6038 }
Francois Pichetaf0f4d02011-08-14 03:52:19 +00006039
6040 // Here we have an function template explicit specialization at class scope.
6041 // The actually specialization will be postponed to template instatiation
6042 // time via the ClassScopeFunctionSpecializationDecl node.
6043 if (isDependentClassScopeExplicitSpecialization) {
6044 ClassScopeFunctionSpecializationDecl *NewSpec =
6045 ClassScopeFunctionSpecializationDecl::Create(
Nico Weber6b020092012-06-25 17:21:05 +00006046 Context, CurContext, SourceLocation(),
6047 cast<CXXMethodDecl>(NewFD),
6048 HasExplicitTemplateArgs, TemplateArgs);
Francois Pichetaf0f4d02011-08-14 03:52:19 +00006049 CurContext->addDecl(NewSpec);
6050 AddToScope = false;
6051 }
Peter Collingbourne14b6ba72011-02-09 21:04:32 +00006052
Douglas Gregor2dc0e642009-03-23 23:06:20 +00006053 return NewFD;
6054}
6055
6056/// \brief Perform semantic checking of a new function declaration.
6057///
6058/// Performs semantic analysis of the new function declaration
6059/// NewFD. This routine performs all semantic checking that does not
6060/// require the actual declarator involved in the declaration, and is
6061/// used both for the declaration of functions as they are parsed
6062/// (called via ActOnDeclarator) and for the declaration of functions
6063/// that have been instantiated via C++ template instantiation (called
6064/// via InstantiateDecl).
6065///
James Dennettefce31f2012-06-22 08:10:18 +00006066/// \param IsExplicitSpecialization whether this new function declaration is
Douglas Gregorfd056bc2009-10-13 16:30:37 +00006067/// an explicit specialization of the previous declaration.
6068///
Chris Lattnereaaebc72009-04-25 08:06:05 +00006069/// This sets NewFD->isInvalidDecl() to true if there was an error.
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00006070///
James Dennettefce31f2012-06-22 08:10:18 +00006071/// \returns true if the function declaration is a redeclaration.
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00006072bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD,
John McCall68263142009-11-18 22:49:29 +00006073 LookupResult &Previous,
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00006074 bool IsExplicitSpecialization) {
David Blaikie14068e82011-09-08 06:33:04 +00006075 assert(!NewFD->getResultType()->isVariablyModifiedType()
6076 && "Variably modified return types are not handled here");
John McCall8c4859a2009-07-24 03:03:21 +00006077
Douglas Gregor2dc0e642009-03-23 23:06:20 +00006078 // Check for a previous declaration of this name.
John McCall68263142009-11-18 22:49:29 +00006079 if (Previous.empty() && NewFD->isExternC()) {
Douglas Gregor63935192009-03-02 00:19:53 +00006080 // Since we did not find anything by this name and we're declaring
6081 // an extern "C" function, look for a non-visible extern "C"
6082 // declaration with the same name.
6083 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
Douglas Gregorec12ce22011-07-28 14:20:37 +00006084 = findLocallyScopedExternalDecl(NewFD->getDeclName());
Douglas Gregor63935192009-03-02 00:19:53 +00006085 if (Pos != LocallyScopedExternalDecls.end())
John McCall68263142009-11-18 22:49:29 +00006086 Previous.addDecl(Pos->second);
Douglas Gregor63935192009-03-02 00:19:53 +00006087 }
6088
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00006089 bool Redeclaration = false;
6090
Douglas Gregor04495c82009-02-24 01:23:02 +00006091 // Merge or overload the declaration with an existing declaration of
6092 // the same name, if appropriate.
John McCall68263142009-11-18 22:49:29 +00006093 if (!Previous.empty()) {
Douglas Gregorf9201e02009-02-11 23:02:49 +00006094 // Determine whether NewFD is an overload of PrevDecl or
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00006095 // a declaration that requires merging. If it's an overload,
6096 // there's no more work to do here; we'll just add the new
6097 // function to the scope.
Douglas Gregorae170942009-02-13 00:26:38 +00006098
John McCall68263142009-11-18 22:49:29 +00006099 NamedDecl *OldDecl = 0;
John McCall871b2e72009-12-09 03:35:25 +00006100 if (!AllowOverloadingOfFunction(Previous, Context)) {
6101 Redeclaration = true;
6102 OldDecl = Previous.getFoundDecl();
6103 } else {
John McCallad00b772010-06-16 08:42:20 +00006104 switch (CheckOverload(S, NewFD, Previous, OldDecl,
6105 /*NewIsUsingDecl*/ false)) {
John McCall871b2e72009-12-09 03:35:25 +00006106 case Ovl_Match:
John McCall9f54ad42009-12-10 09:41:52 +00006107 Redeclaration = true;
John McCall871b2e72009-12-09 03:35:25 +00006108 break;
6109
6110 case Ovl_NonFunction:
6111 Redeclaration = true;
6112 break;
6113
6114 case Ovl_Overload:
6115 Redeclaration = false;
6116 break;
John McCall68263142009-11-18 22:49:29 +00006117 }
Peter Collingbournec80e8112011-01-21 02:08:54 +00006118
David Blaikie4e4d0842012-03-11 07:00:24 +00006119 if (!getLangOpts().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) {
Peter Collingbournec80e8112011-01-21 02:08:54 +00006120 // If a function name is overloadable in C, then every function
6121 // with that name must be marked "overloadable".
6122 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing)
6123 << Redeclaration << NewFD;
6124 NamedDecl *OverloadedDecl = 0;
6125 if (Redeclaration)
6126 OverloadedDecl = OldDecl;
6127 else if (!Previous.empty())
6128 OverloadedDecl = Previous.getRepresentativeDecl();
6129 if (OverloadedDecl)
6130 Diag(OverloadedDecl->getLocation(),
6131 diag::note_attribute_overloadable_prev_overload);
6132 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(),
6133 Context));
6134 }
John McCall68263142009-11-18 22:49:29 +00006135 }
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00006136
John McCall68263142009-11-18 22:49:29 +00006137 if (Redeclaration) {
Douglas Gregor2dc0e642009-03-23 23:06:20 +00006138 // NewFD and OldDecl represent declarations that need to be
Mike Stump1eb44332009-09-09 15:08:12 +00006139 // merged.
James Molloy9cda03f2012-03-13 08:55:35 +00006140 if (MergeFunctionDecl(NewFD, OldDecl, S)) {
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00006141 NewFD->setInvalidDecl();
6142 return Redeclaration;
6143 }
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00006144
John McCall68263142009-11-18 22:49:29 +00006145 Previous.clear();
6146 Previous.addDecl(OldDecl);
6147
Douglas Gregore53060f2009-06-25 22:08:12 +00006148 if (FunctionTemplateDecl *OldTemplateDecl
Douglas Gregor37d681852009-10-12 22:27:17 +00006149 = dyn_cast<FunctionTemplateDecl>(OldDecl)) {
David Blaikied662a792011-10-19 22:56:21 +00006150 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl());
Douglas Gregor37d681852009-10-12 22:27:17 +00006151 FunctionTemplateDecl *NewTemplateDecl
6152 = NewFD->getDescribedFunctionTemplate();
6153 assert(NewTemplateDecl && "Template/non-template mismatch");
6154 if (CXXMethodDecl *Method
6155 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) {
6156 Method->setAccess(OldTemplateDecl->getAccess());
6157 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess());
6158 }
Douglas Gregorfd056bc2009-10-13 16:30:37 +00006159
6160 // If this is an explicit specialization of a member that is a function
6161 // template, mark it as a member specialization.
6162 if (IsExplicitSpecialization &&
6163 NewTemplateDecl->getInstantiatedFromMemberTemplate()) {
6164 NewTemplateDecl->setMemberSpecialization();
6165 assert(OldTemplateDecl->isMemberSpecialization());
6166 }
Douglas Gregor6311d2b2011-09-09 18:32:39 +00006167
Douglas Gregor37d681852009-10-12 22:27:17 +00006168 } else {
Argyrios Kyrtzidis9bedef62009-07-14 03:18:53 +00006169 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions
6170 NewFD->setAccess(OldDecl->getAccess());
Douglas Gregore53060f2009-06-25 22:08:12 +00006171 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl));
Argyrios Kyrtzidis9bedef62009-07-14 03:18:53 +00006172 }
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00006173 }
Douglas Gregor4ce205f2009-02-06 17:46:57 +00006174 }
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00006175
Anders Carlsson2c59d3c2009-09-13 21:33:06 +00006176 // Semantic checking for this function declaration (in isolation).
David Blaikie4e4d0842012-03-11 07:00:24 +00006177 if (getLangOpts().CPlusPlus) {
Anders Carlsson2c59d3c2009-09-13 21:33:06 +00006178 // C++-specific checks.
6179 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) {
6180 CheckConstructor(Constructor);
Anders Carlsson6d701392009-11-15 22:49:34 +00006181 } else if (CXXDestructorDecl *Destructor =
6182 dyn_cast<CXXDestructorDecl>(NewFD)) {
6183 CXXRecordDecl *Record = Destructor->getParent();
Anders Carlsson2c59d3c2009-09-13 21:33:06 +00006184 QualType ClassType = Context.getTypeDeclType(Record);
Anders Carlsson6d701392009-11-15 22:49:34 +00006185
Douglas Gregor4923aa22010-07-02 20:37:36 +00006186 // FIXME: Shouldn't we be able to perform this check even when the class
Anders Carlsson6d701392009-11-15 22:49:34 +00006187 // type is dependent? Both gcc and edg can handle that.
Anders Carlsson2c59d3c2009-09-13 21:33:06 +00006188 if (!ClassType->isDependentType()) {
6189 DeclarationName Name
6190 = Context.DeclarationNames.getCXXDestructorName(
6191 Context.getCanonicalType(ClassType));
6192 if (NewFD->getDeclName() != Name) {
6193 Diag(NewFD->getLocation(), diag::err_destructor_name);
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00006194 NewFD->setInvalidDecl();
6195 return Redeclaration;
Anders Carlsson2c59d3c2009-09-13 21:33:06 +00006196 }
6197 }
Anders Carlsson2c59d3c2009-09-13 21:33:06 +00006198 } else if (CXXConversionDecl *Conversion
Douglas Gregor4ba31362009-12-01 17:24:26 +00006199 = dyn_cast<CXXConversionDecl>(NewFD)) {
Anders Carlsson2c59d3c2009-09-13 21:33:06 +00006200 ActOnConversionDeclarator(Conversion);
Douglas Gregor4ba31362009-12-01 17:24:26 +00006201 }
6202
6203 // Find any virtual functions that this function overrides.
Douglas Gregore6342c02009-12-01 17:35:23 +00006204 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) {
6205 if (!Method->isFunctionTemplateSpecialization() &&
Argyrios Kyrtzidis38eb1e12012-10-09 01:23:45 +00006206 !Method->getDescribedFunctionTemplate() &&
6207 Method->isCanonicalDecl()) {
Douglas Gregora6c1e3a2010-10-13 22:55:32 +00006208 if (AddOverriddenMethods(Method->getParent(), Method)) {
6209 // If the function was marked as "static", we have a problem.
6210 if (NewFD->getStorageClass() == SC_Static) {
David Blaikie5708c182012-10-17 00:47:58 +00006211 ReportOverrides(*this, diag::err_static_overrides_virtual, Method);
Douglas Gregora6c1e3a2010-10-13 22:55:32 +00006212 }
Argyrios Kyrtzidis799ef662011-02-03 18:01:15 +00006213 }
Douglas Gregora6c1e3a2010-10-13 22:55:32 +00006214 }
Douglas Gregorcefc3af2012-04-16 07:05:22 +00006215
6216 if (Method->isStatic())
6217 checkThisInStaticMemberFunctionType(Method);
Douglas Gregore6342c02009-12-01 17:35:23 +00006218 }
Anders Carlsson2c59d3c2009-09-13 21:33:06 +00006219
6220 // Extra checking for C++ overloaded operators (C++ [over.oper]).
6221 if (NewFD->isOverloadedOperator() &&
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00006222 CheckOverloadedOperatorDeclaration(NewFD)) {
6223 NewFD->setInvalidDecl();
6224 return Redeclaration;
6225 }
Sean Hunta6c058d2010-01-13 09:01:02 +00006226
6227 // Extra checking for C++0x literal operators (C++0x [over.literal]).
6228 if (NewFD->getLiteralIdentifier() &&
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00006229 CheckLiteralOperatorDeclaration(NewFD)) {
6230 NewFD->setInvalidDecl();
6231 return Redeclaration;
6232 }
Sean Hunta6c058d2010-01-13 09:01:02 +00006233
Anders Carlsson2c59d3c2009-09-13 21:33:06 +00006234 // In C++, check default arguments now that we have merged decls. Unless
6235 // the lexical context is the class, because in this case this is done
6236 // during delayed parsing anyway.
6237 if (!CurContext->isRecord())
6238 CheckCXXDefaultArguments(NewFD);
Douglas Gregorb68e3992010-12-21 19:47:46 +00006239
6240 // If this function declares a builtin function, check the type of this
6241 // declaration against the expected type for the builtin.
6242 if (unsigned BuiltinID = NewFD->getBuiltinID()) {
6243 ASTContext::GetBuiltinTypeError Error;
6244 QualType T = Context.GetBuiltinType(BuiltinID, Error);
6245 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) {
6246 // The type of this function differs from the type of the builtin,
6247 // so forget about the builtin entirely.
6248 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents);
6249 }
6250 }
Aaron Ballman2c0bf242012-02-09 01:21:34 +00006251
6252 // If this function is declared as being extern "C", then check to see if
6253 // the function returns a UDT (class, struct, or union type) that is not C
6254 // compatible, and if it does, warn the user.
6255 if (NewFD->isExternC()) {
6256 QualType R = NewFD->getResultType();
Hans Wennborg168c07b2012-07-24 17:59:41 +00006257 if (R->isIncompleteType() && !R->isVoidType())
6258 Diag(NewFD->getLocation(), diag::warn_return_value_udt_incomplete)
6259 << NewFD << R;
Douglas Gregorb38b4912012-08-07 06:14:34 +00006260 else if (!R.isPODType(Context) && !R->isVoidType() &&
6261 !R->isObjCObjectPointerType())
Hans Wennborg168c07b2012-07-24 17:59:41 +00006262 Diag(NewFD->getLocation(), diag::warn_return_value_udt) << NewFD << R;
Aaron Ballman2c0bf242012-02-09 01:21:34 +00006263 }
Anders Carlsson2c59d3c2009-09-13 21:33:06 +00006264 }
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00006265 return Redeclaration;
Zhongxing Xu416fcaf2009-01-16 01:13:29 +00006266}
6267
David Blaikie14068e82011-09-08 06:33:04 +00006268void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) {
Richard Smitha5065862012-02-04 06:10:17 +00006269 // C++11 [basic.start.main]p3: A program that declares main to be inline,
6270 // static or constexpr is ill-formed.
John McCall13591ed2009-07-25 04:36:53 +00006271 // C99 6.7.4p4: In a hosted environment, the inline function specifier
6272 // shall not appear in a declaration of main.
6273 // static main is not an error under C99, but we should warn about it.
David Blaikie14068e82011-09-08 06:33:04 +00006274 if (FD->getStorageClass() == SC_Static)
David Blaikie4e4d0842012-03-11 07:00:24 +00006275 Diag(DS.getStorageClassSpecLoc(), getLangOpts().CPlusPlus
David Blaikie14068e82011-09-08 06:33:04 +00006276 ? diag::err_static_main : diag::warn_static_main)
6277 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
6278 if (FD->isInlineSpecified())
6279 Diag(DS.getInlineSpecLoc(), diag::err_inline_main)
6280 << FixItHint::CreateRemoval(DS.getInlineSpecLoc());
Richard Smitha5065862012-02-04 06:10:17 +00006281 if (FD->isConstexpr()) {
6282 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_main)
6283 << FixItHint::CreateRemoval(DS.getConstexprSpecLoc());
6284 FD->setConstexpr(false);
6285 }
John McCall13591ed2009-07-25 04:36:53 +00006286
6287 QualType T = FD->getType();
6288 assert(T->isFunctionType() && "function decl is not of function type");
John McCall75d8ba32012-02-14 19:50:52 +00006289 const FunctionType* FT = T->castAs<FunctionType>();
Mike Stump1eb44332009-09-09 15:08:12 +00006290
John McCall75d8ba32012-02-14 19:50:52 +00006291 // All the standards say that main() should should return 'int'.
6292 if (Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) {
6293 // In C and C++, main magically returns 0 if you fall off the end;
6294 // set the flag which tells us that.
6295 // This is C++ [basic.start.main]p5 and C99 5.1.2.2.3.
6296 FD->setHasImplicitReturnZero(true);
6297
6298 // In C with GNU extensions we allow main() to have non-integer return
6299 // type, but we should warn about the extension, and we disable the
6300 // implicit-return-zero rule.
David Blaikie4e4d0842012-03-11 07:00:24 +00006301 } else if (getLangOpts().GNUMode && !getLangOpts().CPlusPlus) {
John McCall75d8ba32012-02-14 19:50:52 +00006302 Diag(FD->getTypeSpecStartLoc(), diag::ext_main_returns_nonint);
6303
6304 // Otherwise, this is just a flat-out error.
6305 } else {
Douglas Gregor5f39f702011-02-19 19:04:23 +00006306 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint);
John McCall13591ed2009-07-25 04:36:53 +00006307 FD->setInvalidDecl(true);
6308 }
6309
6310 // Treat protoless main() as nullary.
6311 if (isa<FunctionNoProtoType>(FT)) return;
6312
6313 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT);
6314 unsigned nparams = FTP->getNumArgs();
6315 assert(FD->getNumParams() == nparams);
6316
John McCall66755862009-12-24 09:58:38 +00006317 bool HasExtraParameters = (nparams > 3);
6318
6319 // Darwin passes an undocumented fourth argument of type char**. If
6320 // other platforms start sprouting these, the logic below will start
6321 // getting shifty.
Douglas Gregorbcfd1f52011-09-02 00:18:52 +00006322 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin())
John McCall66755862009-12-24 09:58:38 +00006323 HasExtraParameters = false;
6324
6325 if (HasExtraParameters) {
John McCall13591ed2009-07-25 04:36:53 +00006326 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams;
6327 FD->setInvalidDecl(true);
6328 nparams = 3;
6329 }
6330
6331 // FIXME: a lot of the following diagnostics would be improved
6332 // if we had some location information about types.
6333
6334 QualType CharPP =
6335 Context.getPointerType(Context.getPointerType(Context.CharTy));
John McCall66755862009-12-24 09:58:38 +00006336 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP };
John McCall13591ed2009-07-25 04:36:53 +00006337
6338 for (unsigned i = 0; i < nparams; ++i) {
6339 QualType AT = FTP->getArgType(i);
6340
6341 bool mismatch = true;
6342
6343 if (Context.hasSameUnqualifiedType(AT, Expected[i]))
6344 mismatch = false;
6345 else if (Expected[i] == CharPP) {
6346 // As an extension, the following forms are okay:
6347 // char const **
6348 // char const * const *
6349 // char * const *
6350
John McCall0953e762009-09-24 19:53:00 +00006351 QualifierCollector qs;
John McCall13591ed2009-07-25 04:36:53 +00006352 const PointerType* PT;
Ted Kremenek6217b802009-07-29 21:53:49 +00006353 if ((PT = qs.strip(AT)->getAs<PointerType>()) &&
6354 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) &&
John McCall13591ed2009-07-25 04:36:53 +00006355 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) {
6356 qs.removeConst();
6357 mismatch = !qs.empty();
6358 }
6359 }
6360
6361 if (mismatch) {
6362 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i];
6363 // TODO: suggest replacing given type with expected type
6364 FD->setInvalidDecl(true);
6365 }
6366 }
6367
6368 if (nparams == 1 && !FD->isInvalidDecl()) {
6369 Diag(FD->getLocation(), diag::warn_main_one_arg);
6370 }
Douglas Gregor0bab54c2010-10-21 16:57:46 +00006371
6372 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) {
6373 Diag(FD->getLocation(), diag::err_main_template_decl);
6374 FD->setInvalidDecl();
6375 }
John McCall8c4859a2009-07-24 03:03:21 +00006376}
6377
Eli Friedmanc594b322008-05-20 13:48:25 +00006378bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) {
Eli Friedman3b8a36a2009-02-27 04:17:12 +00006379 // FIXME: Need strict checking. In C89, we need to check for
6380 // any assignment, increment, decrement, function-calls, or
6381 // commas outside of a sizeof. In C99, it's the same list,
6382 // except that the aforementioned are allowed in unevaluated
6383 // expressions. Everything else falls under the
6384 // "may accept other forms of constant expressions" exception.
6385 // (We never end up here for C++, so the constant expression
6386 // rules there don't matter.)
John McCall4204f072010-08-02 21:13:48 +00006387 if (Init->isConstantInitializer(Context, false))
Eli Friedman578a9722009-02-22 06:45:27 +00006388 return false;
Eli Friedman21298282009-02-26 04:47:58 +00006389 Diag(Init->getExprLoc(), diag::err_init_element_not_constant)
6390 << Init->getSourceRange();
Eli Friedmanc594b322008-05-20 13:48:25 +00006391 return true;
Steve Naroffd0091aa2008-01-10 22:15:12 +00006392}
6393
Chandler Carrutha7689ef2011-03-27 09:46:56 +00006394namespace {
6395 // Visits an initialization expression to see if OrigDecl is evaluated in
6396 // its own initialization and throws a warning if it does.
6397 class SelfReferenceChecker
6398 : public EvaluatedExprVisitor<SelfReferenceChecker> {
6399 Sema &S;
6400 Decl *OrigDecl;
Richard Trieu898267f2011-09-01 21:44:13 +00006401 bool isRecordType;
6402 bool isPODType;
Hans Wennborg8be9e772012-08-17 10:12:33 +00006403 bool isReferenceType;
Chandler Carrutha7689ef2011-03-27 09:46:56 +00006404
6405 public:
6406 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited;
6407
6408 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context),
Richard Trieu898267f2011-09-01 21:44:13 +00006409 S(S), OrigDecl(OrigDecl) {
6410 isPODType = false;
6411 isRecordType = false;
Hans Wennborg8be9e772012-08-17 10:12:33 +00006412 isReferenceType = false;
Richard Trieu898267f2011-09-01 21:44:13 +00006413 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) {
6414 isPODType = VD->getType().isPODType(S.Context);
6415 isRecordType = VD->getType()->isRecordType();
Hans Wennborg8be9e772012-08-17 10:12:33 +00006416 isReferenceType = VD->getType()->isReferenceType();
Richard Trieu898267f2011-09-01 21:44:13 +00006417 }
6418 }
Chandler Carrutha7689ef2011-03-27 09:46:56 +00006419
Richard Trieu7e9f8af2012-05-09 00:21:34 +00006420 // For most expressions, the cast is directly above the DeclRefExpr.
6421 // For conditional operators, the cast can be outside the conditional
6422 // operator if both expressions are DeclRefExpr's.
6423 void HandleValue(Expr *E) {
Richard Trieu568f7852012-10-01 17:39:51 +00006424 if (isReferenceType)
6425 return;
Richard Trieu7e9f8af2012-05-09 00:21:34 +00006426 E = E->IgnoreParenImpCasts();
6427 if (DeclRefExpr* DRE = dyn_cast<DeclRefExpr>(E)) {
6428 HandleDeclRefExpr(DRE);
6429 return;
6430 }
6431
6432 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) {
6433 HandleValue(CO->getTrueExpr());
6434 HandleValue(CO->getFalseExpr());
Richard Trieu6b2cc422012-10-03 00:41:36 +00006435 return;
6436 }
6437
6438 if (isa<MemberExpr>(E)) {
6439 Expr *Base = E->IgnoreParenImpCasts();
6440 while (MemberExpr *ME = dyn_cast<MemberExpr>(Base)) {
6441 // Check for static member variables and don't warn on them.
6442 if (!isa<FieldDecl>(ME->getMemberDecl()))
6443 return;
6444 Base = ME->getBase()->IgnoreParenImpCasts();
6445 }
6446 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Base))
6447 HandleDeclRefExpr(DRE);
6448 return;
Richard Trieu7e9f8af2012-05-09 00:21:34 +00006449 }
6450 }
6451
Richard Trieu568f7852012-10-01 17:39:51 +00006452 // Reference types are handled here since all uses of references are
6453 // bad, not just r-value uses.
6454 void VisitDeclRefExpr(DeclRefExpr *E) {
6455 if (isReferenceType)
6456 HandleDeclRefExpr(E);
6457 }
6458
Richard Trieu7e9f8af2012-05-09 00:21:34 +00006459 void VisitImplicitCastExpr(ImplicitCastExpr *E) {
Richard Trieu6b2cc422012-10-03 00:41:36 +00006460 if (E->getCastKind() == CK_LValueToRValue ||
Richard Trieu7e9f8af2012-05-09 00:21:34 +00006461 (isRecordType && E->getCastKind() == CK_NoOp))
6462 HandleValue(E->getSubExpr());
6463
6464 Inherited::VisitImplicitCastExpr(E);
Chandler Carrutha7689ef2011-03-27 09:46:56 +00006465 }
6466
Richard Trieu898267f2011-09-01 21:44:13 +00006467 void VisitMemberExpr(MemberExpr *E) {
Richard Trieu7e9f8af2012-05-09 00:21:34 +00006468 // Don't warn on arrays since they can be treated as pointers.
Richard Trieu47eb8982011-09-07 00:58:53 +00006469 if (E->getType()->canDecayToPointerType()) return;
Richard Trieu7e9f8af2012-05-09 00:21:34 +00006470
Richard Trieu6b2cc422012-10-03 00:41:36 +00006471 // Warn when a non-static method call is followed by non-static member
6472 // field accesses, which is followed by a DeclRefExpr.
6473 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(E->getMemberDecl());
6474 bool Warn = (MD && !MD->isStatic());
6475 Expr *Base = E->getBase()->IgnoreParenImpCasts();
6476 while (MemberExpr *ME = dyn_cast<MemberExpr>(Base)) {
6477 if (!isa<FieldDecl>(ME->getMemberDecl()))
6478 Warn = false;
6479 Base = ME->getBase()->IgnoreParenImpCasts();
6480 }
Richard Trieu898267f2011-09-01 21:44:13 +00006481
Richard Trieu6b2cc422012-10-03 00:41:36 +00006482 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Base)) {
6483 if (Warn)
6484 HandleDeclRefExpr(DRE);
6485 return;
6486 }
6487
6488 // The base of a MemberExpr is not a MemberExpr or a DeclRefExpr.
6489 // Visit that expression.
6490 Visit(Base);
Chandler Carrutha7689ef2011-03-27 09:46:56 +00006491 }
6492
Richard Trieu898267f2011-09-01 21:44:13 +00006493 void VisitUnaryOperator(UnaryOperator *E) {
6494 // For POD record types, addresses of its own members are well-defined.
Richard Trieu6b2cc422012-10-03 00:41:36 +00006495 if (E->getOpcode() == UO_AddrOf && isRecordType &&
6496 isa<MemberExpr>(E->getSubExpr()->IgnoreParens())) {
6497 if (!isPODType)
6498 HandleValue(E->getSubExpr());
6499 return;
6500 }
Richard Trieu898267f2011-09-01 21:44:13 +00006501 Inherited::VisitUnaryOperator(E);
6502 }
Richard Trieu7e9f8af2012-05-09 00:21:34 +00006503
6504 void VisitObjCMessageExpr(ObjCMessageExpr *E) { return; }
6505
Richard Trieu898267f2011-09-01 21:44:13 +00006506 void HandleDeclRefExpr(DeclRefExpr *DRE) {
6507 Decl* ReferenceDecl = DRE->getDecl();
Chandler Carrutha7689ef2011-03-27 09:46:56 +00006508 if (OrigDecl != ReferenceDecl) return;
Hans Wennborg5965b7c2012-08-20 08:52:22 +00006509 unsigned diag = isReferenceType
6510 ? diag::warn_uninit_self_reference_in_reference_init
6511 : diag::warn_uninit_self_reference_in_init;
Richard Trieu898267f2011-09-01 21:44:13 +00006512 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE,
Hans Wennborg5965b7c2012-08-20 08:52:22 +00006513 S.PDiag(diag)
Hans Wennborg7821e072012-09-21 08:58:33 +00006514 << DRE->getNameInfo().getName()
Douglas Gregor63fe6812011-05-24 16:02:01 +00006515 << OrigDecl->getLocation()
Richard Trieu898267f2011-09-01 21:44:13 +00006516 << DRE->getSourceRange());
Chandler Carrutha7689ef2011-03-27 09:46:56 +00006517 }
6518 };
Chandler Carrutha7689ef2011-03-27 09:46:56 +00006519
Richard Trieu568f7852012-10-01 17:39:51 +00006520 /// CheckSelfReference - Warns if OrigDecl is used in expression E.
6521 static void CheckSelfReference(Sema &S, Decl* OrigDecl, Expr *E,
6522 bool DirectInit) {
6523 // Parameters arguments are occassionially constructed with itself,
6524 // for instance, in recursive functions. Skip them.
6525 if (isa<ParmVarDecl>(OrigDecl))
6526 return;
6527
6528 E = E->IgnoreParens();
6529
6530 // Skip checking T a = a where T is not a record or reference type.
6531 // Doing so is a way to silence uninitialized warnings.
6532 if (!DirectInit && !cast<VarDecl>(OrigDecl)->getType()->isRecordType())
6533 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E))
6534 if (ICE->getCastKind() == CK_LValueToRValue)
6535 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()))
6536 if (DRE->getDecl() == OrigDecl)
6537 return;
6538
6539 SelfReferenceChecker(S, OrigDecl).Visit(E);
6540 }
Richard Trieu898267f2011-09-01 21:44:13 +00006541}
6542
Douglas Gregor09f41cf2009-01-14 15:45:31 +00006543/// AddInitializerToDecl - Adds the initializer Init to the
6544/// declaration dcl. If DirectInit is true, this is C++ direct
6545/// initialization rather than copy initialization.
Richard Smith34b41d92011-02-20 03:19:35 +00006546void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init,
6547 bool DirectInit, bool TypeMayContainAuto) {
Chris Lattner9a11b9a2007-10-19 20:10:30 +00006548 // If there is no declaration, there was an error parsing it. Just ignore
6549 // the initializer.
Richard Smith34b41d92011-02-20 03:19:35 +00006550 if (RealDecl == 0 || RealDecl->isInvalidDecl())
Chris Lattner9a11b9a2007-10-19 20:10:30 +00006551 return;
Mike Stump1eb44332009-09-09 15:08:12 +00006552
Douglas Gregor021c3b32009-03-11 23:00:04 +00006553 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) {
6554 // With declarators parsed the way they are, the parser cannot
6555 // distinguish between a normal initializer and a pure-specifier.
6556 // Thus this grotesque test.
6557 IntegerLiteral *IL;
Douglas Gregor021c3b32009-03-11 23:00:04 +00006558 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 &&
Douglas Gregor4ba31362009-12-01 17:24:26 +00006559 Context.getCanonicalType(IL->getType()) == Context.IntTy)
6560 CheckPureMethod(Method, Init->getSourceRange());
6561 else {
Douglas Gregor021c3b32009-03-11 23:00:04 +00006562 Diag(Method->getLocation(), diag::err_member_function_initialization)
6563 << Method->getDeclName() << Init->getSourceRange();
6564 Method->setInvalidDecl();
6565 }
6566 return;
6567 }
6568
Steve Naroff410e3e22007-09-12 20:13:48 +00006569 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl);
6570 if (!VDecl) {
Richard Smithc2cdd532011-06-12 11:43:46 +00006571 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here");
6572 Diag(RealDecl->getLocation(), diag::err_illegal_initializer);
Steve Naroff410e3e22007-09-12 20:13:48 +00006573 RealDecl->setInvalidDecl();
6574 return;
Eli Friedman3b8a36a2009-02-27 04:17:12 +00006575 }
6576
Sebastian Redl5b9cc5d2012-02-11 23:51:47 +00006577 ParenListExpr *CXXDirectInit = dyn_cast<ParenListExpr>(Init);
6578
Richard Smith01888722011-12-15 19:20:59 +00006579 // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for.
Richard Smith8ad6c862012-07-08 04:13:07 +00006580 AutoType *Auto = 0;
6581 if (TypeMayContainAuto &&
6582 (Auto = VDecl->getType()->getContainedAutoType()) &&
6583 !Auto->isDeduced()) {
Sebastian Redl5b9cc5d2012-02-11 23:51:47 +00006584 Expr *DeduceInit = Init;
6585 // Initializer could be a C++ direct-initializer. Deduction only works if it
6586 // contains exactly one expression.
6587 if (CXXDirectInit) {
6588 if (CXXDirectInit->getNumExprs() == 0) {
6589 // It isn't possible to write this directly, but it is possible to
6590 // end up in this situation with "auto x(some_pack...);"
Daniel Dunbar96a00142012-03-09 18:35:03 +00006591 Diag(CXXDirectInit->getLocStart(),
Sebastian Redl5b9cc5d2012-02-11 23:51:47 +00006592 diag::err_auto_var_init_no_expression)
6593 << VDecl->getDeclName() << VDecl->getType()
6594 << VDecl->getSourceRange();
6595 RealDecl->setInvalidDecl();
6596 return;
6597 } else if (CXXDirectInit->getNumExprs() > 1) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00006598 Diag(CXXDirectInit->getExpr(1)->getLocStart(),
Sebastian Redl5b9cc5d2012-02-11 23:51:47 +00006599 diag::err_auto_var_init_multiple_expressions)
6600 << VDecl->getDeclName() << VDecl->getType()
6601 << VDecl->getSourceRange();
6602 RealDecl->setInvalidDecl();
6603 return;
6604 } else {
6605 DeduceInit = CXXDirectInit->getExpr(0);
6606 }
6607 }
Richard Smitha085da82011-03-17 16:11:59 +00006608 TypeSourceInfo *DeducedType = 0;
Sebastian Redl5b9cc5d2012-02-11 23:51:47 +00006609 if (DeduceAutoType(VDecl->getTypeSourceInfo(), DeduceInit, DeducedType) ==
Sebastian Redlb832f6d2012-01-23 22:09:39 +00006610 DAR_Failed)
Sebastian Redl5b9cc5d2012-02-11 23:51:47 +00006611 DiagnoseAutoDeductionFailure(VDecl, DeduceInit);
Richard Smitha085da82011-03-17 16:11:59 +00006612 if (!DeducedType) {
Richard Smith34b41d92011-02-20 03:19:35 +00006613 RealDecl->setInvalidDecl();
6614 return;
6615 }
Richard Smitha085da82011-03-17 16:11:59 +00006616 VDecl->setTypeSourceInfo(DeducedType);
6617 VDecl->setType(DeducedType->getType());
Rafael Espindoladfb31662012-12-25 00:39:58 +00006618 VDecl->ClearLVCache();
Douglas Gregoree188032012-02-20 20:05:29 +00006619
John McCallf85e1932011-06-15 23:02:42 +00006620 // In ARC, infer lifetime.
David Blaikie4e4d0842012-03-11 07:00:24 +00006621 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(VDecl))
John McCallf85e1932011-06-15 23:02:42 +00006622 VDecl->setInvalidDecl();
6623
Jordan Rose0abbdfe2012-06-08 22:46:07 +00006624 // Warn if we deduced 'id'. 'auto' usually implies type-safety, but using
6625 // 'id' instead of a specific object type prevents most of our usual checks.
6626 // We only want to warn outside of template instantiations, though:
6627 // inside a template, the 'id' could have come from a parameter.
6628 if (ActiveTemplateInstantiations.empty() &&
6629 DeducedType->getType()->isObjCIdType()) {
6630 SourceLocation Loc = DeducedType->getTypeLoc().getBeginLoc();
6631 Diag(Loc, diag::warn_auto_var_is_id)
6632 << VDecl->getDeclName() << DeduceInit->getSourceRange();
6633 }
6634
Richard Smith34b41d92011-02-20 03:19:35 +00006635 // If this is a redeclaration, check that the type we just deduced matches
6636 // the previously declared type.
Douglas Gregoref96ee02012-01-14 16:38:05 +00006637 if (VarDecl *Old = VDecl->getPreviousDecl())
Richard Smith34b41d92011-02-20 03:19:35 +00006638 MergeVarDeclTypes(VDecl, Old);
6639 }
Richard Smith01888722011-12-15 19:20:59 +00006640
6641 if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) {
6642 // C99 6.7.8p5. C++ has no such restriction, but that is a defect.
6643 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init);
6644 VDecl->setInvalidDecl();
6645 return;
6646 }
6647
Sebastian Redl5b9cc5d2012-02-11 23:51:47 +00006648 if (!VDecl->getType()->isDependentType()) {
6649 // A definition must end up with a complete type, which means it must be
6650 // complete with the restriction that an array type might be completed by
6651 // the initializer; note that later code assumes this restriction.
6652 QualType BaseDeclType = VDecl->getType();
6653 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType))
6654 BaseDeclType = Array->getElementType();
6655 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType,
6656 diag::err_typecheck_decl_incomplete_type)) {
6657 RealDecl->setInvalidDecl();
6658 return;
6659 }
Douglas Gregor3a91abf2010-08-24 05:27:49 +00006660
Sebastian Redl5b9cc5d2012-02-11 23:51:47 +00006661 // The variable can not have an abstract class type.
6662 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(),
6663 diag::err_abstract_type_in_decl,
6664 AbstractVariableType))
6665 VDecl->setInvalidDecl();
Eli Friedmana31feca2009-04-13 21:28:54 +00006666 }
6667
Sebastian Redl31310a22010-02-01 20:16:42 +00006668 const VarDecl *Def;
6669 if ((Def = VDecl->getDefinition()) && Def != VDecl) {
Mike Stump1eb44332009-09-09 15:08:12 +00006670 Diag(VDecl->getLocation(), diag::err_redefinition)
Douglas Gregor275a3692009-03-10 23:43:53 +00006671 << VDecl->getDeclName();
6672 Diag(Def->getLocation(), diag::note_previous_definition);
6673 VDecl->setInvalidDecl();
6674 return;
6675 }
Douglas Gregor3a91abf2010-08-24 05:27:49 +00006676
Douglas Gregor3a91abf2010-08-24 05:27:49 +00006677 const VarDecl* PrevInit = 0;
David Blaikie4e4d0842012-03-11 07:00:24 +00006678 if (getLangOpts().CPlusPlus) {
Douglas Gregora31040f2010-12-16 01:31:22 +00006679 // C++ [class.static.data]p4
6680 // If a static data member is of const integral or const
6681 // enumeration type, its declaration in the class definition can
6682 // specify a constant-initializer which shall be an integral
6683 // constant expression (5.19). In that case, the member can appear
6684 // in integral constant expressions. The member shall still be
6685 // defined in a namespace scope if it is used in the program and the
6686 // namespace scope definition shall not contain an initializer.
6687 //
6688 // We already performed a redefinition check above, but for static
6689 // data members we also need to check whether there was an in-class
6690 // declaration with an initializer.
6691 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) {
David Blaikied662a792011-10-19 22:56:21 +00006692 Diag(VDecl->getLocation(), diag::err_redefinition)
6693 << VDecl->getDeclName();
Douglas Gregora31040f2010-12-16 01:31:22 +00006694 Diag(PrevInit->getLocation(), diag::note_previous_definition);
6695 return;
6696 }
Douglas Gregor275a3692009-03-10 23:43:53 +00006697
Douglas Gregora31040f2010-12-16 01:31:22 +00006698 if (VDecl->hasLocalStorage())
6699 getCurFunction()->setHasBranchProtectedScope();
6700
6701 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) {
6702 VDecl->setInvalidDecl();
6703 return;
6704 }
6705 }
John McCalle46f62c2010-08-01 01:24:59 +00006706
Peter Collingbourne8c25fc52011-09-19 21:14:35 +00006707 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside
6708 // a kernel function cannot be initialized."
6709 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) {
6710 Diag(VDecl->getLocation(), diag::err_local_cant_init);
6711 VDecl->setInvalidDecl();
6712 return;
6713 }
6714
Steve Naroffbb204692007-09-12 14:07:44 +00006715 // Get the decls type and save a reference for later, since
Steve Naroffd0091aa2008-01-10 22:15:12 +00006716 // CheckInitializerTypes may change it.
Steve Naroff410e3e22007-09-12 20:13:48 +00006717 QualType DclT = VDecl->getType(), SavT = DclT;
Fariborz Jahanian509fb3e2012-03-09 18:47:16 +00006718
6719 // Top-level message sends default to 'id' when we're in a debugger
6720 // and we are assigning it to a variable of 'id' type.
David Blaikie4e4d0842012-03-11 07:00:24 +00006721 if (getLangOpts().DebuggerCastResultToId && DclT->isObjCIdType())
Fariborz Jahanian509fb3e2012-03-09 18:47:16 +00006722 if (Init->getType() == Context.UnknownAnyTy && isa<ObjCMessageExpr>(Init)) {
6723 ExprResult Result = forceUnknownAnyToType(Init, Context.getObjCIdType());
6724 if (Result.isInvalid()) {
6725 VDecl->setInvalidDecl();
6726 return;
6727 }
6728 Init = Result.take();
6729 }
Richard Smith01888722011-12-15 19:20:59 +00006730
6731 // Perform the initialization.
6732 if (!VDecl->isInvalidDecl()) {
6733 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl);
6734 InitializationKind Kind
Sebastian Redl168319c2012-02-12 16:37:24 +00006735 = DirectInit ?
6736 CXXDirectInit ? InitializationKind::CreateDirect(VDecl->getLocation(),
6737 Init->getLocStart(),
6738 Init->getLocEnd())
6739 : InitializationKind::CreateDirectList(
6740 VDecl->getLocation())
Richard Smith01888722011-12-15 19:20:59 +00006741 : InitializationKind::CreateCopy(VDecl->getLocation(),
6742 Init->getLocStart());
6743
Sebastian Redl5b9cc5d2012-02-11 23:51:47 +00006744 Expr **Args = &Init;
6745 unsigned NumArgs = 1;
6746 if (CXXDirectInit) {
6747 Args = CXXDirectInit->getExprs();
6748 NumArgs = CXXDirectInit->getNumExprs();
6749 }
6750 InitializationSequence InitSeq(*this, Entity, Kind, Args, NumArgs);
Richard Smith01888722011-12-15 19:20:59 +00006751 ExprResult Result = InitSeq.Perform(*this, Entity, Kind,
Benjamin Kramer5354e772012-08-23 23:38:35 +00006752 MultiExprArg(Args, NumArgs), &DclT);
Richard Smith01888722011-12-15 19:20:59 +00006753 if (Result.isInvalid()) {
Steve Naroff248a7532008-04-15 22:42:06 +00006754 VDecl->setInvalidDecl();
Richard Smith01888722011-12-15 19:20:59 +00006755 return;
Steve Naroffbb204692007-09-12 14:07:44 +00006756 }
Richard Smith01888722011-12-15 19:20:59 +00006757
6758 Init = Result.takeAs<Expr>();
6759 }
6760
Richard Trieu568f7852012-10-01 17:39:51 +00006761 // Check for self-references within variable initializers.
6762 // Variables declared within a function/method body (except for references)
6763 // are handled by a dataflow analysis.
6764 if (!VDecl->hasLocalStorage() || VDecl->getType()->isRecordType() ||
6765 VDecl->getType()->isReferenceType()) {
6766 CheckSelfReference(*this, RealDecl, Init, DirectInit);
6767 }
6768
Richard Smith01888722011-12-15 19:20:59 +00006769 // If the type changed, it means we had an incomplete type that was
6770 // completed by the initializer. For example:
6771 // int ary[] = { 1, 3, 5 };
John McCall73076432012-01-05 00:13:19 +00006772 // "ary" transitions from an IncompleteArrayType to a ConstantArrayType.
Eli Friedman5c89c392012-02-23 02:25:10 +00006773 if (!VDecl->isInvalidDecl() && (DclT != SavT))
Richard Smith01888722011-12-15 19:20:59 +00006774 VDecl->setType(DclT);
Richard Smith01888722011-12-15 19:20:59 +00006775
6776 // Check any implicit conversions within the expression.
6777 CheckImplicitConversions(Init, VDecl->getLocation());
6778
Jordan Rosee10f4d32012-09-15 02:48:31 +00006779 if (!VDecl->isInvalidDecl()) {
Richard Smith01888722011-12-15 19:20:59 +00006780 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init);
6781
Jordan Rosee10f4d32012-09-15 02:48:31 +00006782 if (VDecl->hasAttr<BlocksAttr>())
6783 checkRetainCycles(VDecl, Init);
Jordan Rose58b6bdc2012-09-28 22:21:30 +00006784
6785 // It is safe to assign a weak reference into a strong variable.
6786 // Although this code can still have problems:
6787 // id x = self.weakProp;
6788 // id y = self.weakProp;
6789 // we do not warn to warn spuriously when 'x' and 'y' are on separate
6790 // paths through the function. This should be revisited if
6791 // -Wrepeated-use-of-weak is made flow-sensitive.
Ted Kremenek904a3262012-12-20 22:31:27 +00006792 if (VDecl->getType().getObjCLifetime() == Qualifiers::OCL_Strong) {
Jordan Rose58b6bdc2012-09-28 22:21:30 +00006793 DiagnosticsEngine::Level Level =
6794 Diags.getDiagnosticLevel(diag::warn_arc_repeated_use_of_weak,
6795 Init->getLocStart());
6796 if (Level != DiagnosticsEngine::Ignored)
6797 getCurFunction()->markSafeWeakUse(Init);
6798 }
Jordan Rosee10f4d32012-09-15 02:48:31 +00006799 }
6800
Richard Smith01888722011-12-15 19:20:59 +00006801 Init = MaybeCreateExprWithCleanups(Init);
6802 // Attach the initializer to the decl.
6803 VDecl->setInit(Init);
6804
6805 if (VDecl->isLocalVarDecl()) {
6806 // C99 6.7.8p4: All the expressions in an initializer for an object that has
6807 // static storage duration shall be constant expressions or string literals.
6808 // C++ does not have this restriction.
David Blaikie4e4d0842012-03-11 07:00:24 +00006809 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl() &&
Richard Smith01888722011-12-15 19:20:59 +00006810 VDecl->getStorageClass() == SC_Static)
6811 CheckForConstantInitializer(Init, DclT);
Mike Stump1eb44332009-09-09 15:08:12 +00006812 } else if (VDecl->isStaticDataMember() &&
Douglas Gregor021c3b32009-03-11 23:00:04 +00006813 VDecl->getLexicalDeclContext()->isRecord()) {
6814 // This is an in-class initialization for a static data member, e.g.,
6815 //
6816 // struct S {
6817 // static const int value = 17;
6818 // };
6819
Douglas Gregor021c3b32009-03-11 23:00:04 +00006820 // C++ [class.mem]p4:
6821 // A member-declarator can contain a constant-initializer only
6822 // if it declares a static member (9.4) of const integral or
6823 // const enumeration type, see 9.4.2.
Richard Smithc6d990a2011-09-29 19:11:37 +00006824 //
Richard Smith01888722011-12-15 19:20:59 +00006825 // C++11 [class.static.data]p3:
Richard Smithc6d990a2011-09-29 19:11:37 +00006826 // If a non-volatile const static data member is of integral or
6827 // enumeration type, its declaration in the class definition can
6828 // specify a brace-or-equal-initializer in which every initalizer-clause
6829 // that is an assignment-expression is a constant expression. A static
6830 // data member of literal type can be declared in the class definition
6831 // with the constexpr specifier; if so, its declaration shall specify a
6832 // brace-or-equal-initializer in which every initializer-clause that is
6833 // an assignment-expression is a constant expression.
John McCall4e635642010-09-10 23:21:22 +00006834
6835 // Do nothing on dependent types.
Richard Smith01888722011-12-15 19:20:59 +00006836 if (DclT->isDependentType()) {
John McCall4e635642010-09-10 23:21:22 +00006837
Richard Smithc6d990a2011-09-29 19:11:37 +00006838 // Allow any 'static constexpr' members, whether or not they are of literal
Richard Smith86c3ae42012-02-13 03:54:03 +00006839 // type. We separately check that every constexpr variable is of literal
6840 // type.
Richard Smithc6d990a2011-09-29 19:11:37 +00006841 } else if (VDecl->isConstexpr()) {
6842
John McCall4e635642010-09-10 23:21:22 +00006843 // Require constness.
Richard Smith01888722011-12-15 19:20:59 +00006844 } else if (!DclT.isConstQualified()) {
John McCall4e635642010-09-10 23:21:22 +00006845 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const)
6846 << Init->getSourceRange();
Douglas Gregor021c3b32009-03-11 23:00:04 +00006847 VDecl->setInvalidDecl();
John McCall4e635642010-09-10 23:21:22 +00006848
6849 // We allow integer constant expressions in all cases.
Richard Smith01888722011-12-15 19:20:59 +00006850 } else if (DclT->isIntegralOrEnumerationType()) {
Chris Lattner24c38e12011-06-14 05:46:29 +00006851 // Check whether the expression is a constant expression.
6852 SourceLocation Loc;
David Blaikie4e4d0842012-03-11 07:00:24 +00006853 if (getLangOpts().CPlusPlus0x && DclT.isVolatileQualified())
Richard Smith01888722011-12-15 19:20:59 +00006854 // In C++11, a non-constexpr const static data member with an
Richard Smith2da7a512011-09-29 21:28:14 +00006855 // in-class initializer cannot be volatile.
6856 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile);
6857 else if (Init->isValueDependent())
Chris Lattner24c38e12011-06-14 05:46:29 +00006858 ; // Nothing to check.
6859 else if (Init->isIntegerConstantExpr(Context, &Loc))
6860 ; // Ok, it's an ICE!
6861 else if (Init->isEvaluatable(Context)) {
6862 // If we can constant fold the initializer through heroics, accept it,
6863 // but report this as a use of an extension for -pedantic.
6864 Diag(Loc, diag::ext_in_class_initializer_non_constant)
6865 << Init->getSourceRange();
6866 } else {
6867 // Otherwise, this is some crazy unknown case. Report the issue at the
6868 // location provided by the isIntegerConstantExpr failed check.
6869 Diag(Loc, diag::err_in_class_initializer_non_constant)
6870 << Init->getSourceRange();
6871 VDecl->setInvalidDecl();
John McCall4e635642010-09-10 23:21:22 +00006872 }
6873
Richard Smith01888722011-12-15 19:20:59 +00006874 // We allow foldable floating-point constants as an extension.
6875 } else if (DclT->isFloatingType()) { // also permits complex, which is ok
Richard Smithc6d990a2011-09-29 19:11:37 +00006876 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type)
Richard Smith01888722011-12-15 19:20:59 +00006877 << DclT << Init->getSourceRange();
David Blaikie4e4d0842012-03-11 07:00:24 +00006878 if (getLangOpts().CPlusPlus0x)
Richard Smith2d23ec22011-09-30 00:33:19 +00006879 Diag(VDecl->getLocation(),
6880 diag::note_in_class_initializer_float_type_constexpr)
6881 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr ");
John McCall4e635642010-09-10 23:21:22 +00006882
Richard Smith01888722011-12-15 19:20:59 +00006883 if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) {
John McCall4e635642010-09-10 23:21:22 +00006884 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant)
6885 << Init->getSourceRange();
6886 VDecl->setInvalidDecl();
Douglas Gregor021c3b32009-03-11 23:00:04 +00006887 }
Richard Smith947be192011-09-29 23:18:34 +00006888
Richard Smith01888722011-12-15 19:20:59 +00006889 // Suggest adding 'constexpr' in C++11 for literal types.
David Blaikie4e4d0842012-03-11 07:00:24 +00006890 } else if (getLangOpts().CPlusPlus0x && DclT->isLiteralType()) {
Richard Smith947be192011-09-29 23:18:34 +00006891 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type)
Richard Smith01888722011-12-15 19:20:59 +00006892 << DclT << Init->getSourceRange()
Richard Smith947be192011-09-29 23:18:34 +00006893 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr ");
6894 VDecl->setConstexpr(true);
6895
Richard Smithc6d990a2011-09-29 19:11:37 +00006896 } else {
6897 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type)
Richard Smith01888722011-12-15 19:20:59 +00006898 << DclT << Init->getSourceRange();
Richard Smithc6d990a2011-09-29 19:11:37 +00006899 VDecl->setInvalidDecl();
Douglas Gregor021c3b32009-03-11 23:00:04 +00006900 }
Steve Naroff248a7532008-04-15 22:42:06 +00006901 } else if (VDecl->isFileVarDecl()) {
Richard Smith01888722011-12-15 19:20:59 +00006902 if (VDecl->getStorageClassAsWritten() == SC_Extern &&
David Blaikie4e4d0842012-03-11 07:00:24 +00006903 (!getLangOpts().CPlusPlus ||
Douglas Gregor66dd9392010-04-22 14:36:26 +00006904 !Context.getBaseElementType(VDecl->getType()).isConstQualified()))
Steve Naroff410e3e22007-09-12 20:13:48 +00006905 Diag(VDecl->getLocation(), diag::warn_extern_init);
Eli Friedmana91eb542009-12-22 02:10:53 +00006906
Richard Smith01888722011-12-15 19:20:59 +00006907 // C99 6.7.8p4. All file scoped initializers need to be constant.
David Blaikie4e4d0842012-03-11 07:00:24 +00006908 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl())
Anders Carlssonc5eb7312008-08-22 05:00:02 +00006909 CheckForConstantInitializer(Init, DclT);
Steve Naroffbb204692007-09-12 14:07:44 +00006910 }
Douglas Gregorb6c8c8b2009-04-21 17:11:58 +00006911
Sebastian Redl5b9cc5d2012-02-11 23:51:47 +00006912 // We will represent direct-initialization similarly to copy-initialization:
6913 // int x(1); -as-> int x = 1;
6914 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c);
6915 //
6916 // Clients that want to distinguish between the two forms, can check for
6917 // direct initializer using VarDecl::getInitStyle().
6918 // A major benefit is that clients that don't particularly care about which
6919 // exactly form was it (like the CodeGen) can handle both cases without
6920 // special case code.
6921
6922 // C++ 8.5p11:
6923 // The form of initialization (using parentheses or '=') is generally
6924 // insignificant, but does matter when the entity being initialized has a
6925 // class type.
6926 if (CXXDirectInit) {
6927 assert(DirectInit && "Call-style initializer must be direct init.");
6928 VDecl->setInitStyle(VarDecl::CallInit);
6929 } else if (DirectInit) {
6930 // This must be list-initialization. No other way is direct-initialization.
6931 VDecl->setInitStyle(VarDecl::ListInit);
6932 }
6933
John McCall2998d6b2011-01-19 11:48:09 +00006934 CheckCompleteVariableDeclaration(VDecl);
Steve Naroffbb204692007-09-12 14:07:44 +00006935}
6936
John McCall7727acf2010-03-31 02:13:20 +00006937/// ActOnInitializerError - Given that there was an error parsing an
6938/// initializer for the given declaration, try to return to some form
6939/// of sanity.
John McCalld226f652010-08-21 09:40:31 +00006940void Sema::ActOnInitializerError(Decl *D) {
John McCall7727acf2010-03-31 02:13:20 +00006941 // Our main concern here is re-establishing invariants like "a
6942 // variable's type is either dependent or complete".
John McCall7727acf2010-03-31 02:13:20 +00006943 if (!D || D->isInvalidDecl()) return;
6944
6945 VarDecl *VD = dyn_cast<VarDecl>(D);
6946 if (!VD) return;
6947
Richard Smith34b41d92011-02-20 03:19:35 +00006948 // Auto types are meaningless if we can't make sense of the initializer.
Richard Smith483b9f32011-02-21 20:05:19 +00006949 if (ParsingInitForAutoVars.count(D)) {
6950 D->setInvalidDecl();
Richard Smith34b41d92011-02-20 03:19:35 +00006951 return;
6952 }
6953
John McCall7727acf2010-03-31 02:13:20 +00006954 QualType Ty = VD->getType();
6955 if (Ty->isDependentType()) return;
6956
6957 // Require a complete type.
6958 if (RequireCompleteType(VD->getLocation(),
6959 Context.getBaseElementType(Ty),
6960 diag::err_typecheck_decl_incomplete_type)) {
6961 VD->setInvalidDecl();
6962 return;
6963 }
6964
6965 // Require an abstract type.
6966 if (RequireNonAbstractType(VD->getLocation(), Ty,
6967 diag::err_abstract_type_in_decl,
6968 AbstractVariableType)) {
6969 VD->setInvalidDecl();
6970 return;
6971 }
6972
6973 // Don't bother complaining about constructors or destructors,
6974 // though.
6975}
6976
John McCalld226f652010-08-21 09:40:31 +00006977void Sema::ActOnUninitializedDecl(Decl *RealDecl,
Richard Smith34b41d92011-02-20 03:19:35 +00006978 bool TypeMayContainAuto) {
Argyrios Kyrtzidis48c2e902008-11-07 13:01:22 +00006979 // If there is no declaration, there was an error parsing it. Just ignore it.
6980 if (RealDecl == 0)
6981 return;
6982
Douglas Gregor27c8dc02008-10-29 00:13:59 +00006983 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) {
6984 QualType Type = Var->getType();
Douglas Gregorb6c8c8b2009-04-21 17:11:58 +00006985
Richard Smithdd4b3502011-12-25 21:17:58 +00006986 // C++11 [dcl.spec.auto]p3
Richard Smith34b41d92011-02-20 03:19:35 +00006987 if (TypeMayContainAuto && Type->getContainedAutoType()) {
Anders Carlsson6a75cd92009-07-11 00:34:39 +00006988 Diag(Var->getLocation(), diag::err_auto_var_requires_init)
6989 << Var->getDeclName() << Type;
6990 Var->setInvalidDecl();
6991 return;
6992 }
Mike Stump1eb44332009-09-09 15:08:12 +00006993
Richard Smithdd4b3502011-12-25 21:17:58 +00006994 // C++11 [class.static.data]p3: A static data member can be declared with
Richard Smithc6d990a2011-09-29 19:11:37 +00006995 // the constexpr specifier; if so, its declaration shall specify
6996 // a brace-or-equal-initializer.
Richard Smithdd4b3502011-12-25 21:17:58 +00006997 // C++11 [dcl.constexpr]p1: The constexpr specifier shall be applied only to
6998 // the definition of a variable [...] or the declaration of a static data
6999 // member.
7000 if (Var->isConstexpr() && !Var->isThisDeclarationADefinition()) {
7001 if (Var->isStaticDataMember())
7002 Diag(Var->getLocation(),
7003 diag::err_constexpr_static_mem_var_requires_init)
7004 << Var->getDeclName();
7005 else
7006 Diag(Var->getLocation(), diag::err_invalid_constexpr_var_decl);
Richard Smithc6d990a2011-09-29 19:11:37 +00007007 Var->setInvalidDecl();
7008 return;
7009 }
7010
Douglas Gregor60c93c92010-02-09 07:26:29 +00007011 switch (Var->isThisDeclarationADefinition()) {
7012 case VarDecl::Definition:
7013 if (!Var->isStaticDataMember() || !Var->getAnyInitializer())
7014 break;
7015
7016 // We have an out-of-line definition of a static data member
7017 // that has an in-class initializer, so we type-check this like
7018 // a declaration.
7019 //
7020 // Fall through
7021
7022 case VarDecl::DeclarationOnly:
7023 // It's only a declaration.
7024
7025 // Block scope. C99 6.7p7: If an identifier for an object is
7026 // declared with no linkage (C99 6.2.2p6), the type for the
7027 // object shall be complete.
John McCallb6bbcc92010-10-15 04:57:14 +00007028 if (!Type->isDependentType() && Var->isLocalVarDecl() &&
Douglas Gregor60c93c92010-02-09 07:26:29 +00007029 !Var->getLinkage() && !Var->isInvalidDecl() &&
7030 RequireCompleteType(Var->getLocation(), Type,
7031 diag::err_typecheck_decl_incomplete_type))
7032 Var->setInvalidDecl();
7033
7034 // Make sure that the type is not abstract.
7035 if (!Type->isDependentType() && !Var->isInvalidDecl() &&
7036 RequireNonAbstractType(Var->getLocation(), Type,
7037 diag::err_abstract_type_in_decl,
7038 AbstractVariableType))
7039 Var->setInvalidDecl();
Fariborz Jahanian4cc83c22012-08-15 18:42:26 +00007040 if (!Type->isDependentType() && !Var->isInvalidDecl() &&
Fariborz Jahanian767a1a22012-08-17 21:44:55 +00007041 Var->getStorageClass() == SC_PrivateExtern) {
Fariborz Jahanian4cc83c22012-08-15 18:42:26 +00007042 Diag(Var->getLocation(), diag::warn_private_extern);
Fariborz Jahanian767a1a22012-08-17 21:44:55 +00007043 Diag(Var->getLocation(), diag::note_private_extern);
7044 }
Fariborz Jahanian4cc83c22012-08-15 18:42:26 +00007045
Douglas Gregor60c93c92010-02-09 07:26:29 +00007046 return;
7047
7048 case VarDecl::TentativeDefinition:
7049 // File scope. C99 6.9.2p2: A declaration of an identifier for an
7050 // object that has file scope without an initializer, and without a
7051 // storage-class specifier or with the storage-class specifier "static",
7052 // constitutes a tentative definition. Note: A tentative definition with
7053 // external linkage is valid (C99 6.2.2p5).
7054 if (!Var->isInvalidDecl()) {
7055 if (const IncompleteArrayType *ArrayT
7056 = Context.getAsIncompleteArrayType(Type)) {
7057 if (RequireCompleteType(Var->getLocation(),
7058 ArrayT->getElementType(),
7059 diag::err_illegal_decl_array_incomplete_type))
7060 Var->setInvalidDecl();
John McCalld931b082010-08-26 03:08:43 +00007061 } else if (Var->getStorageClass() == SC_Static) {
Douglas Gregor60c93c92010-02-09 07:26:29 +00007062 // C99 6.9.2p3: If the declaration of an identifier for an object is
7063 // a tentative definition and has internal linkage (C99 6.2.2p3), the
7064 // declared type shall not be an incomplete type.
7065 // NOTE: code such as the following
7066 // static struct s;
7067 // struct s { int a; };
7068 // is accepted by gcc. Hence here we issue a warning instead of
7069 // an error and we do not invalidate the static declaration.
7070 // NOTE: to avoid multiple warnings, only check the first declaration.
Douglas Gregoref96ee02012-01-14 16:38:05 +00007071 if (Var->getPreviousDecl() == 0)
Douglas Gregor60c93c92010-02-09 07:26:29 +00007072 RequireCompleteType(Var->getLocation(), Type,
7073 diag::ext_typecheck_decl_incomplete_type);
7074 }
7075 }
7076
7077 // Record the tentative definition; we're done.
7078 if (!Var->isInvalidDecl())
7079 TentativeDefinitions.push_back(Var);
7080 return;
7081 }
7082
7083 // Provide a specific diagnostic for uninitialized variable
7084 // definitions with incomplete array type.
7085 if (Type->isIncompleteArrayType()) {
Sebastian Redl6e824752009-11-05 19:47:47 +00007086 Diag(Var->getLocation(),
7087 diag::err_typecheck_incomplete_array_needs_initializer);
7088 Var->setInvalidDecl();
7089 return;
7090 }
7091
John McCallb567a8b2010-08-01 01:25:24 +00007092 // Provide a specific diagnostic for uninitialized variable
7093 // definitions with reference type.
7094 if (Type->isReferenceType()) {
7095 Diag(Var->getLocation(), diag::err_reference_var_requires_init)
7096 << Var->getDeclName()
7097 << SourceRange(Var->getLocation(), Var->getLocation());
7098 Var->setInvalidDecl();
7099 return;
7100 }
Douglas Gregor60c93c92010-02-09 07:26:29 +00007101
7102 // Do not attempt to type-check the default initializer for a
7103 // variable with dependent type.
7104 if (Type->isDependentType())
Douglas Gregor251b4ff2009-10-08 07:24:58 +00007105 return;
Douglas Gregor39da0b82009-09-09 23:08:42 +00007106
Douglas Gregor60c93c92010-02-09 07:26:29 +00007107 if (Var->isInvalidDecl())
7108 return;
Douglas Gregor1ab537b2009-12-03 18:33:45 +00007109
Douglas Gregor60c93c92010-02-09 07:26:29 +00007110 if (RequireCompleteType(Var->getLocation(),
7111 Context.getBaseElementType(Type),
7112 diag::err_typecheck_decl_incomplete_type)) {
7113 Var->setInvalidDecl();
7114 return;
Douglas Gregor18fe5682008-11-03 20:45:27 +00007115 }
Douglas Gregor27c8dc02008-10-29 00:13:59 +00007116
Douglas Gregor60c93c92010-02-09 07:26:29 +00007117 // The variable can not have an abstract class type.
7118 if (RequireNonAbstractType(Var->getLocation(), Type,
7119 diag::err_abstract_type_in_decl,
7120 AbstractVariableType)) {
7121 Var->setInvalidDecl();
7122 return;
7123 }
7124
Douglas Gregor4337dc72011-05-21 17:52:48 +00007125 // Check for jumps past the implicit initializer. C++0x
7126 // clarifies that this applies to a "variable with automatic
7127 // storage duration", not a "local variable".
Richard Smith0e9e9812011-10-20 21:42:12 +00007128 // C++11 [stmt.dcl]p3
Douglas Gregor4337dc72011-05-21 17:52:48 +00007129 // A program that jumps from a point where a variable with automatic
7130 // storage duration is not in scope to a point where it is in scope is
7131 // ill-formed unless the variable has scalar type, class type with a
7132 // trivial default constructor and a trivial destructor, a cv-qualified
7133 // version of one of these types, or an array of one of the preceding
7134 // types and is declared without an initializer.
David Blaikie4e4d0842012-03-11 07:00:24 +00007135 if (getLangOpts().CPlusPlus && Var->hasLocalStorage()) {
Douglas Gregor4337dc72011-05-21 17:52:48 +00007136 if (const RecordType *Record
7137 = Context.getBaseElementType(Type)->getAs<RecordType>()) {
Sean Hunta6bff2c2011-05-11 22:50:12 +00007138 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl());
Richard Smith0e9e9812011-10-20 21:42:12 +00007139 // Mark the function for further checking even if the looser rules of
7140 // C++11 do not require such checks, so that we can diagnose
7141 // incompatibilities with C++98.
7142 if (!CXXRecord->isPOD())
Sean Hunta6bff2c2011-05-11 22:50:12 +00007143 getCurFunction()->setHasBranchProtectedScope();
7144 }
Douglas Gregor60c93c92010-02-09 07:26:29 +00007145 }
Douglas Gregor4337dc72011-05-21 17:52:48 +00007146
7147 // C++03 [dcl.init]p9:
7148 // If no initializer is specified for an object, and the
7149 // object is of (possibly cv-qualified) non-POD class type (or
7150 // array thereof), the object shall be default-initialized; if
7151 // the object is of const-qualified type, the underlying class
7152 // type shall have a user-declared default
7153 // constructor. Otherwise, if no initializer is specified for
7154 // a non- static object, the object and its subobjects, if
7155 // any, have an indeterminate initial value); if the object
7156 // or any of its subobjects are of const-qualified type, the
7157 // program is ill-formed.
7158 // C++0x [dcl.init]p11:
7159 // If no initializer is specified for an object, the object is
7160 // default-initialized; [...].
7161 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var);
7162 InitializationKind Kind
7163 = InitializationKind::CreateDefault(Var->getLocation());
7164
7165 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0);
Benjamin Kramer5354e772012-08-23 23:38:35 +00007166 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, MultiExprArg());
Douglas Gregor4337dc72011-05-21 17:52:48 +00007167 if (Init.isInvalid())
7168 Var->setInvalidDecl();
Sebastian Redl5b9cc5d2012-02-11 23:51:47 +00007169 else if (Init.get()) {
Douglas Gregor4337dc72011-05-21 17:52:48 +00007170 Var->setInit(MaybeCreateExprWithCleanups(Init.get()));
Sebastian Redl5b9cc5d2012-02-11 23:51:47 +00007171 // This is important for template substitution.
7172 Var->setInitStyle(VarDecl::CallInit);
7173 }
Douglas Gregor516a6bc2010-03-08 02:45:10 +00007174
John McCall2998d6b2011-01-19 11:48:09 +00007175 CheckCompleteVariableDeclaration(Var);
Douglas Gregor27c8dc02008-10-29 00:13:59 +00007176 }
7177}
7178
Richard Smithad762fc2011-04-14 22:09:26 +00007179void Sema::ActOnCXXForRangeDecl(Decl *D) {
7180 VarDecl *VD = dyn_cast<VarDecl>(D);
7181 if (!VD) {
7182 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var);
7183 D->setInvalidDecl();
7184 return;
7185 }
7186
7187 VD->setCXXForRangeDecl(true);
7188
7189 // for-range-declaration cannot be given a storage class specifier.
7190 int Error = -1;
7191 switch (VD->getStorageClassAsWritten()) {
7192 case SC_None:
7193 break;
7194 case SC_Extern:
7195 Error = 0;
7196 break;
7197 case SC_Static:
7198 Error = 1;
7199 break;
7200 case SC_PrivateExtern:
7201 Error = 2;
7202 break;
7203 case SC_Auto:
7204 Error = 3;
7205 break;
7206 case SC_Register:
7207 Error = 4;
7208 break;
Peter Collingbourne8c25fc52011-09-19 21:14:35 +00007209 case SC_OpenCLWorkGroupLocal:
Peter Collingbourne8be0c742011-09-20 12:40:26 +00007210 llvm_unreachable("Unexpected storage class");
Richard Smithad762fc2011-04-14 22:09:26 +00007211 }
Richard Smithc6d990a2011-09-29 19:11:37 +00007212 if (VD->isConstexpr())
7213 Error = 5;
Richard Smithad762fc2011-04-14 22:09:26 +00007214 if (Error != -1) {
7215 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class)
7216 << VD->getDeclName() << Error;
7217 D->setInvalidDecl();
7218 }
7219}
7220
John McCall2998d6b2011-01-19 11:48:09 +00007221void Sema::CheckCompleteVariableDeclaration(VarDecl *var) {
7222 if (var->isInvalidDecl()) return;
7223
John McCallf85e1932011-06-15 23:02:42 +00007224 // In ARC, don't allow jumps past the implicit initialization of a
7225 // local retaining variable.
David Blaikie4e4d0842012-03-11 07:00:24 +00007226 if (getLangOpts().ObjCAutoRefCount &&
John McCallf85e1932011-06-15 23:02:42 +00007227 var->hasLocalStorage()) {
7228 switch (var->getType().getObjCLifetime()) {
7229 case Qualifiers::OCL_None:
7230 case Qualifiers::OCL_ExplicitNone:
7231 case Qualifiers::OCL_Autoreleasing:
7232 break;
7233
7234 case Qualifiers::OCL_Weak:
7235 case Qualifiers::OCL_Strong:
7236 getCurFunction()->setHasBranchProtectedScope();
7237 break;
7238 }
7239 }
7240
Eli Friedmane4851f22012-10-23 20:19:32 +00007241 if (var->isThisDeclarationADefinition() &&
Manuel Klimekacaf1102012-12-12 13:26:54 +00007242 var->getLinkage() == ExternalLinkage &&
7243 getDiagnostics().getDiagnosticLevel(
7244 diag::warn_missing_variable_declarations,
7245 var->getLocation())) {
Eli Friedmane4851f22012-10-23 20:19:32 +00007246 // Find a previous declaration that's not a definition.
7247 VarDecl *prev = var->getPreviousDecl();
7248 while (prev && prev->isThisDeclarationADefinition())
7249 prev = prev->getPreviousDecl();
7250
7251 if (!prev)
7252 Diag(var->getLocation(), diag::warn_missing_variable_declarations) << var;
7253 }
7254
John McCall2998d6b2011-01-19 11:48:09 +00007255 // All the following checks are C++ only.
David Blaikie4e4d0842012-03-11 07:00:24 +00007256 if (!getLangOpts().CPlusPlus) return;
John McCall2998d6b2011-01-19 11:48:09 +00007257
Richard Smitha67d5032012-11-09 23:03:14 +00007258 QualType type = var->getType();
7259 if (type->isDependentType()) return;
John McCall2998d6b2011-01-19 11:48:09 +00007260
7261 // __block variables might require us to capture a copy-initializer.
7262 if (var->hasAttr<BlocksAttr>()) {
7263 // It's currently invalid to ever have a __block variable with an
7264 // array type; should we diagnose that here?
7265
7266 // Regardless, we don't want to ignore array nesting when
7267 // constructing this copy.
John McCall2998d6b2011-01-19 11:48:09 +00007268 if (type->isStructureOrClassType()) {
7269 SourceLocation poi = var->getLocation();
John McCallf4b88a42012-03-10 09:33:50 +00007270 Expr *varRef =new (Context) DeclRefExpr(var, false, type, VK_LValue, poi);
John McCall2998d6b2011-01-19 11:48:09 +00007271 ExprResult result =
7272 PerformCopyInitialization(
7273 InitializedEntity::InitializeBlock(poi, type, false),
7274 poi, Owned(varRef));
7275 if (!result.isInvalid()) {
7276 result = MaybeCreateExprWithCleanups(result);
7277 Expr *init = result.takeAs<Expr>();
7278 Context.setBlockVarCopyInits(var, init);
7279 }
7280 }
7281 }
7282
Richard Smith66f85712011-11-07 22:16:17 +00007283 Expr *Init = var->getInit();
7284 bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal();
Richard Smitha67d5032012-11-09 23:03:14 +00007285 QualType baseType = Context.getBaseElementType(type);
Richard Smith66f85712011-11-07 22:16:17 +00007286
Richard Smith9568f0c2012-10-29 18:26:47 +00007287 if (!var->getDeclContext()->isDependentContext() &&
7288 Init && !Init->isValueDependent()) {
Richard Smith099e7f62011-12-19 06:19:21 +00007289 if (IsGlobal && !var->isConstexpr() &&
7290 getDiagnostics().getDiagnosticLevel(diag::warn_global_constructor,
7291 var->getLocation())
7292 != DiagnosticsEngine::Ignored &&
7293 !Init->isConstantInitializer(Context, baseType->isReferenceType()))
Richard Smith66f85712011-11-07 22:16:17 +00007294 Diag(var->getLocation(), diag::warn_global_constructor)
7295 << Init->getSourceRange();
Richard Smith099e7f62011-12-19 06:19:21 +00007296
Richard Smith099e7f62011-12-19 06:19:21 +00007297 if (var->isConstexpr()) {
7298 llvm::SmallVector<PartialDiagnosticAt, 8> Notes;
7299 if (!var->evaluateValue(Notes) || !var->isInitICE()) {
7300 SourceLocation DiagLoc = var->getLocation();
7301 // If the note doesn't add any useful information other than a source
7302 // location, fold it into the primary diagnostic.
7303 if (Notes.size() == 1 && Notes[0].second.getDiagID() ==
7304 diag::note_invalid_subexpr_in_const_expr) {
7305 DiagLoc = Notes[0].first;
7306 Notes.clear();
7307 }
7308 Diag(DiagLoc, diag::err_constexpr_var_requires_const_init)
7309 << var << Init->getSourceRange();
7310 for (unsigned I = 0, N = Notes.size(); I != N; ++I)
7311 Diag(Notes[I].first, Notes[I].second);
7312 }
Daniel Dunbar3d13c5a2012-03-09 01:51:51 +00007313 } else if (var->isUsableInConstantExpressions(Context)) {
Richard Smith099e7f62011-12-19 06:19:21 +00007314 // Check whether the initializer of a const variable of integral or
7315 // enumeration type is an ICE now, since we can't tell whether it was
7316 // initialized by a constant expression if we check later.
7317 var->checkInitIsICE();
7318 }
Richard Smith66f85712011-11-07 22:16:17 +00007319 }
John McCall2998d6b2011-01-19 11:48:09 +00007320
7321 // Require the destructor.
7322 if (const RecordType *recordType = baseType->getAs<RecordType>())
7323 FinalizeVarWithDestructor(var, recordType);
7324}
7325
Richard Smith483b9f32011-02-21 20:05:19 +00007326/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform
7327/// any semantic actions necessary after any initializer has been attached.
7328void
7329Sema::FinalizeDeclaration(Decl *ThisDecl) {
7330 // Note that we are no longer parsing the initializer for this declaration.
7331 ParsingInitForAutoVars.erase(ThisDecl);
Dmitri Gribenko0d5a0692012-08-17 00:08:38 +00007332
7333 // Now we have parsed the initializer and can update the table of magic
7334 // tag values.
7335 if (ThisDecl && ThisDecl->hasAttr<TypeTagForDatatypeAttr>()) {
7336 const VarDecl *VD = dyn_cast<VarDecl>(ThisDecl);
7337 if (VD && VD->getType()->isIntegralOrEnumerationType()) {
7338 for (specific_attr_iterator<TypeTagForDatatypeAttr>
7339 I = ThisDecl->specific_attr_begin<TypeTagForDatatypeAttr>(),
7340 E = ThisDecl->specific_attr_end<TypeTagForDatatypeAttr>();
7341 I != E; ++I) {
7342 const Expr *MagicValueExpr = VD->getInit();
7343 if (!MagicValueExpr) {
7344 continue;
7345 }
7346 llvm::APSInt MagicValueInt;
7347 if (!MagicValueExpr->isIntegerConstantExpr(MagicValueInt, Context)) {
7348 Diag(I->getRange().getBegin(),
7349 diag::err_type_tag_for_datatype_not_ice)
7350 << LangOpts.CPlusPlus << MagicValueExpr->getSourceRange();
7351 continue;
7352 }
7353 if (MagicValueInt.getActiveBits() > 64) {
7354 Diag(I->getRange().getBegin(),
7355 diag::err_type_tag_for_datatype_too_large)
7356 << LangOpts.CPlusPlus << MagicValueExpr->getSourceRange();
7357 continue;
7358 }
7359 uint64_t MagicValue = MagicValueInt.getZExtValue();
7360 RegisterTypeTagForDatatype(I->getArgumentKind(),
7361 MagicValue,
7362 I->getMatchingCType(),
7363 I->getLayoutCompatible(),
7364 I->getMustBeNull());
7365 }
7366 }
7367 }
Richard Smith483b9f32011-02-21 20:05:19 +00007368}
7369
John McCallb3d87482010-08-24 05:47:05 +00007370Sema::DeclGroupPtrTy
7371Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS,
7372 Decl **Group, unsigned NumDecls) {
Chris Lattner5f9e2722011-07-23 10:55:15 +00007373 SmallVector<Decl*, 8> Decls;
Eli Friedmanc1dc6532009-05-29 01:49:24 +00007374
7375 if (DS.isTypeSpecOwned())
John McCallb3d87482010-08-24 05:47:05 +00007376 Decls.push_back(DS.getRepAsDecl());
Eli Friedmanc1dc6532009-05-29 01:49:24 +00007377
Richard Smith406c38e2011-02-23 00:37:57 +00007378 for (unsigned i = 0; i != NumDecls; ++i)
7379 if (Decl *D = Group[i])
7380 Decls.push_back(D);
7381
David Blaikie66cff722012-11-14 01:52:05 +00007382 if (DeclSpec::isDeclRep(DS.getTypeSpecType()))
7383 if (const TagDecl *Tag = dyn_cast_or_null<TagDecl>(DS.getRepAsDecl()))
7384 getASTContext().addUnnamedTag(Tag);
7385
Chandler Carrutha7689ef2011-03-27 09:46:56 +00007386 return BuildDeclaratorGroup(Decls.data(), Decls.size(),
Richard Smith406c38e2011-02-23 00:37:57 +00007387 DS.getTypeSpecType() == DeclSpec::TST_auto);
7388}
7389
7390/// BuildDeclaratorGroup - convert a list of declarations into a declaration
7391/// group, performing any necessary semantic checking.
7392Sema::DeclGroupPtrTy
7393Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls,
7394 bool TypeMayContainAuto) {
Richard Smith34b41d92011-02-20 03:19:35 +00007395 // C++0x [dcl.spec.auto]p7:
7396 // If the type deduced for the template parameter U is not the same in each
7397 // deduction, the program is ill-formed.
7398 // FIXME: When initializer-list support is added, a distinction is needed
7399 // between the deduced type U and the deduced type which 'auto' stands for.
7400 // auto a = 0, b = { 1, 2, 3 };
7401 // is legal because the deduced type U is 'int' in both cases.
Richard Smith406c38e2011-02-23 00:37:57 +00007402 if (TypeMayContainAuto && NumDecls > 1) {
Richard Smith34b41d92011-02-20 03:19:35 +00007403 QualType Deduced;
7404 CanQualType DeducedCanon;
7405 VarDecl *DeducedDecl = 0;
7406 for (unsigned i = 0; i != NumDecls; ++i) {
7407 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) {
7408 AutoType *AT = D->getType()->getContainedAutoType();
Richard Smith406c38e2011-02-23 00:37:57 +00007409 // Don't reissue diagnostics when instantiating a template.
7410 if (AT && D->isInvalidDecl())
7411 break;
Richard Smith34b41d92011-02-20 03:19:35 +00007412 if (AT && AT->isDeduced()) {
7413 QualType U = AT->getDeducedType();
7414 CanQualType UCanon = Context.getCanonicalType(U);
7415 if (Deduced.isNull()) {
7416 Deduced = U;
7417 DeducedCanon = UCanon;
7418 DeducedDecl = D;
7419 } else if (DeducedCanon != UCanon) {
Richard Smith406c38e2011-02-23 00:37:57 +00007420 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(),
7421 diag::err_auto_different_deductions)
Richard Smith34b41d92011-02-20 03:19:35 +00007422 << Deduced << DeducedDecl->getDeclName()
7423 << U << D->getDeclName()
7424 << DeducedDecl->getInit()->getSourceRange()
7425 << D->getInit()->getSourceRange();
Richard Smith406c38e2011-02-23 00:37:57 +00007426 D->setInvalidDecl();
Richard Smith34b41d92011-02-20 03:19:35 +00007427 break;
7428 }
7429 }
7430 }
7431 }
7432 }
7433
Dmitri Gribenkoa5ef44f2012-07-11 21:38:39 +00007434 ActOnDocumentableDecls(Group, NumDecls);
7435
Richard Smith406c38e2011-02-23 00:37:57 +00007436 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls));
Reid Spencer5f016e22007-07-11 17:01:13 +00007437}
Steve Naroffe1223f72007-08-28 03:03:08 +00007438
Dmitri Gribenkoa5ef44f2012-07-11 21:38:39 +00007439void Sema::ActOnDocumentableDecl(Decl *D) {
7440 ActOnDocumentableDecls(&D, 1);
7441}
7442
7443void Sema::ActOnDocumentableDecls(Decl **Group, unsigned NumDecls) {
7444 // Don't parse the comment if Doxygen diagnostics are ignored.
7445 if (NumDecls == 0 || !Group[0])
7446 return;
7447
7448 if (Diags.getDiagnosticLevel(diag::warn_doc_param_not_found,
7449 Group[0]->getLocation())
7450 == DiagnosticsEngine::Ignored)
7451 return;
7452
7453 if (NumDecls >= 2) {
7454 // This is a decl group. Normally it will contain only declarations
7455 // procuded from declarator list. But in case we have any definitions or
7456 // additional declaration references:
7457 // 'typedef struct S {} S;'
7458 // 'typedef struct S *S;'
7459 // 'struct S *pS;'
7460 // FinalizeDeclaratorGroup adds these as separate declarations.
7461 Decl *MaybeTagDecl = Group[0];
7462 if (MaybeTagDecl && isa<TagDecl>(MaybeTagDecl)) {
7463 Group++;
7464 NumDecls--;
7465 }
7466 }
7467
7468 // See if there are any new comments that are not attached to a decl.
7469 ArrayRef<RawComment *> Comments = Context.getRawCommentList().getComments();
7470 if (!Comments.empty() &&
7471 !Comments.back()->isAttached()) {
7472 // There is at least one comment that not attached to a decl.
7473 // Maybe it should be attached to one of these decls?
7474 //
7475 // Note that this way we pick up not only comments that precede the
7476 // declaration, but also comments that *follow* the declaration -- thanks to
7477 // the lookahead in the lexer: we've consumed the semicolon and looked
7478 // ahead through comments.
7479 for (unsigned i = 0; i != NumDecls; ++i)
Dmitri Gribenko19523542012-09-29 11:40:46 +00007480 Context.getCommentForDecl(Group[i], &PP);
Dmitri Gribenkoa5ef44f2012-07-11 21:38:39 +00007481 }
7482}
Chris Lattner682bf922009-03-29 16:50:03 +00007483
Chris Lattner04421082008-04-08 04:40:51 +00007484/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator()
7485/// to introduce parameters into function prototype scope.
John McCalld226f652010-08-21 09:40:31 +00007486Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) {
Chris Lattner985abd92008-06-26 06:49:43 +00007487 const DeclSpec &DS = D.getDeclSpec();
Douglas Gregor584049d2008-12-15 23:53:10 +00007488
Chris Lattner04421082008-04-08 04:40:51 +00007489 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'.
Peter Collingbourne7a8a2e32011-10-21 11:55:09 +00007490 // C++03 [dcl.stc]p2 also permits 'auto'.
John McCalld931b082010-08-26 03:08:43 +00007491 VarDecl::StorageClass StorageClass = SC_None;
7492 VarDecl::StorageClass StorageClassAsWritten = SC_None;
Daniel Dunbar33ad0122008-09-03 21:54:21 +00007493 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) {
John McCalld931b082010-08-26 03:08:43 +00007494 StorageClass = SC_Register;
7495 StorageClassAsWritten = SC_Register;
David Blaikie4e4d0842012-03-11 07:00:24 +00007496 } else if (getLangOpts().CPlusPlus &&
Peter Collingbourne7a8a2e32011-10-21 11:55:09 +00007497 DS.getStorageClassSpec() == DeclSpec::SCS_auto) {
7498 StorageClass = SC_Auto;
7499 StorageClassAsWritten = SC_Auto;
Daniel Dunbar33ad0122008-09-03 21:54:21 +00007500 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) {
Chris Lattner04421082008-04-08 04:40:51 +00007501 Diag(DS.getStorageClassSpecLoc(),
7502 diag::err_invalid_storage_class_in_func_decl);
Chris Lattner985abd92008-06-26 06:49:43 +00007503 D.getMutableDeclSpec().ClearStorageClassSpecs();
Chris Lattner04421082008-04-08 04:40:51 +00007504 }
Eli Friedman63054b32009-04-19 20:27:55 +00007505
7506 if (D.getDeclSpec().isThreadSpecified())
7507 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
Richard Smithaf1fc7a2011-08-15 21:04:07 +00007508 if (D.getDeclSpec().isConstexprSpecified())
7509 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr)
7510 << 0;
Eli Friedman63054b32009-04-19 20:27:55 +00007511
Eli Friedman85a53192009-04-07 19:37:57 +00007512 DiagnoseFunctionSpecifiers(D);
7513
Argyrios Kyrtzidis32153982011-06-28 03:01:15 +00007514 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
John McCallbf1a0282010-06-04 23:28:52 +00007515 QualType parmDeclType = TInfo->getType();
Mike Stump1eb44332009-09-09 15:08:12 +00007516
David Blaikie4e4d0842012-03-11 07:00:24 +00007517 if (getLangOpts().CPlusPlus) {
Douglas Gregora8bc8c92010-12-23 22:44:42 +00007518 // Check that there are no default arguments inside the type of this
7519 // parameter.
7520 CheckExtraCXXDefaultArguments(D);
Douglas Gregora8bc8c92010-12-23 22:44:42 +00007521
7522 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1).
7523 if (D.getCXXScopeSpec().isSet()) {
7524 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator)
7525 << D.getCXXScopeSpec().getRange();
7526 D.getCXXScopeSpec().clear();
7527 }
Douglas Gregor402abb52009-05-28 23:31:59 +00007528 }
7529
Sean Hunt7533a5b2010-11-03 01:07:06 +00007530 // Ensure we have a valid name
7531 IdentifierInfo *II = 0;
7532 if (D.hasName()) {
7533 II = D.getIdentifier();
7534 if (!II) {
7535 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name)
7536 << GetNameForDeclarator(D).getName().getAsString();
7537 D.setInvalidType(true);
7538 }
7539 }
7540
Chris Lattnerd84aac12010-02-22 00:40:25 +00007541 // Check for redeclaration of parameters, e.g. int foo(int x, int x);
Chris Lattnercf79b012009-01-21 02:38:50 +00007542 if (II) {
John McCall10f28732010-03-18 06:42:38 +00007543 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName,
7544 ForRedeclaration);
7545 LookupName(R, S);
7546 if (R.isSingleResult()) {
7547 NamedDecl *PrevDecl = R.getFoundDecl();
Chris Lattnercf79b012009-01-21 02:38:50 +00007548 if (PrevDecl->isTemplateParameter()) {
7549 // Maybe we will complain about the shadowed template parameter.
7550 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
7551 // Just pretend that we didn't see the previous declaration.
7552 PrevDecl = 0;
John McCalld226f652010-08-21 09:40:31 +00007553 } else if (S->isDeclScope(PrevDecl)) {
Chris Lattnercf79b012009-01-21 02:38:50 +00007554 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II;
Chris Lattnerd84aac12010-02-22 00:40:25 +00007555 Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
Chris Lattner04421082008-04-08 04:40:51 +00007556
Chris Lattnercf79b012009-01-21 02:38:50 +00007557 // Recover by removing the name
7558 II = 0;
7559 D.SetIdentifier(0, D.getIdentifierLoc());
Fariborz Jahanian9a66c302010-02-12 21:53:14 +00007560 D.setInvalidType(true);
Chris Lattnercf79b012009-01-21 02:38:50 +00007561 }
Chris Lattner04421082008-04-08 04:40:51 +00007562 }
Reid Spencer5f016e22007-07-11 17:01:13 +00007563 }
Steve Naroff6a9f3e32007-08-07 22:44:21 +00007564
John McCall7a9813c2010-01-22 00:28:27 +00007565 // Temporarily put parameter variables in the translation unit, not
7566 // the enclosing context. This prevents them from accidentally
7567 // looking like class members in C++.
Douglas Gregorcb27b0f2010-04-12 07:48:19 +00007568 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(),
Daniel Dunbar96a00142012-03-09 18:35:03 +00007569 D.getLocStart(),
Abramo Bagnaraff676cb2011-03-08 08:55:46 +00007570 D.getIdentifierLoc(), II,
7571 parmDeclType, TInfo,
Douglas Gregor16573fa2010-04-19 22:54:31 +00007572 StorageClass, StorageClassAsWritten);
Mike Stump1eb44332009-09-09 15:08:12 +00007573
Chris Lattnereaaebc72009-04-25 08:06:05 +00007574 if (D.isInvalidType())
John McCallfb44de92011-05-01 22:35:37 +00007575 New->setInvalidDecl();
7576
7577 assert(S->isFunctionPrototypeScope());
7578 assert(S->getFunctionPrototypeDepth() >= 1);
7579 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1,
7580 S->getNextFunctionPrototypeIndex());
Douglas Gregorcb27b0f2010-04-12 07:48:19 +00007581
Douglas Gregor44b43212008-12-11 16:49:14 +00007582 // Add the parameter declaration into this scope.
John McCalld226f652010-08-21 09:40:31 +00007583 S->AddDecl(New);
Argyrios Kyrtzidis87f3ff02008-04-12 00:47:19 +00007584 if (II)
Douglas Gregor44b43212008-12-11 16:49:14 +00007585 IdResolver.AddDecl(New);
Nate Begemanb7894b52008-02-17 21:20:31 +00007586
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00007587 ProcessDeclAttributes(S, New, D);
Mike Stumpea000bf2009-04-30 00:19:40 +00007588
Douglas Gregore3895852011-09-12 18:37:38 +00007589 if (D.getDeclSpec().isModulePrivateSpecified())
7590 Diag(New->getLocation(), diag::err_module_private_local)
7591 << 1 << New->getDeclName()
7592 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc())
7593 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc());
7594
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00007595 if (New->hasAttr<BlocksAttr>()) {
Mike Stumpea000bf2009-04-30 00:19:40 +00007596 Diag(New->getLocation(), diag::err_block_on_nonlocal);
7597 }
John McCalld226f652010-08-21 09:40:31 +00007598 return New;
Reid Spencer5f016e22007-07-11 17:01:13 +00007599}
Fariborz Jahanian306d68f2007-11-08 23:49:49 +00007600
John McCall82dc0092010-06-04 11:21:44 +00007601/// \brief Synthesizes a variable for a parameter arising from a
7602/// typedef.
7603ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC,
7604 SourceLocation Loc,
7605 QualType T) {
Abramo Bagnaraff676cb2011-03-08 08:55:46 +00007606 /* FIXME: setting StartLoc == Loc.
7607 Would it be worth to modify callers so as to provide proper source
7608 location for the unnamed parameters, embedding the parameter's type? */
7609 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0,
John McCall82dc0092010-06-04 11:21:44 +00007610 T, Context.getTrivialTypeSourceInfo(T, Loc),
John McCalld931b082010-08-26 03:08:43 +00007611 SC_None, SC_None, 0);
John McCall82dc0092010-06-04 11:21:44 +00007612 Param->setImplicit();
7613 return Param;
7614}
7615
John McCallfbce0e12010-08-24 09:05:15 +00007616void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param,
7617 ParmVarDecl * const *ParamEnd) {
John McCallfbce0e12010-08-24 09:05:15 +00007618 // Don't diagnose unused-parameter errors in template instantiations; we
7619 // will already have done so in the template itself.
7620 if (!ActiveTemplateInstantiations.empty())
7621 return;
7622
7623 for (; Param != ParamEnd; ++Param) {
Eli Friedmandd9d6452012-01-13 23:41:25 +00007624 if (!(*Param)->isReferenced() && (*Param)->getDeclName() &&
John McCallfbce0e12010-08-24 09:05:15 +00007625 !(*Param)->hasAttr<UnusedAttr>()) {
7626 Diag((*Param)->getLocation(), diag::warn_unused_parameter)
7627 << (*Param)->getDeclName();
7628 }
7629 }
7630}
7631
Argyrios Kyrtzidis3532fdd2010-11-17 23:11:54 +00007632void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param,
7633 ParmVarDecl * const *ParamEnd,
7634 QualType ReturnTy,
7635 NamedDecl *D) {
Argyrios Kyrtzidis1380a142010-11-18 00:20:36 +00007636 if (LangOpts.NumLargeByValueCopy == 0) // No check.
Argyrios Kyrtzidis3532fdd2010-11-17 23:11:54 +00007637 return;
7638
Argyrios Kyrtzidis1380a142010-11-18 00:20:36 +00007639 // Warn if the return value is pass-by-value and larger than the specified
7640 // threshold.
Eli Friedmand18840d2012-01-09 23:46:59 +00007641 if (!ReturnTy->isDependentType() && ReturnTy.isPODType(Context)) {
Argyrios Kyrtzidis3532fdd2010-11-17 23:11:54 +00007642 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity();
Argyrios Kyrtzidis1380a142010-11-18 00:20:36 +00007643 if (Size > LangOpts.NumLargeByValueCopy)
Argyrios Kyrtzidis3532fdd2010-11-17 23:11:54 +00007644 Diag(D->getLocation(), diag::warn_return_value_size)
7645 << D->getDeclName() << Size;
7646 }
7647
Argyrios Kyrtzidis1380a142010-11-18 00:20:36 +00007648 // Warn if any parameter is pass-by-value and larger than the specified
7649 // threshold.
Argyrios Kyrtzidis3532fdd2010-11-17 23:11:54 +00007650 for (; Param != ParamEnd; ++Param) {
7651 QualType T = (*Param)->getType();
Eli Friedmand18840d2012-01-09 23:46:59 +00007652 if (T->isDependentType() || !T.isPODType(Context))
Argyrios Kyrtzidis3532fdd2010-11-17 23:11:54 +00007653 continue;
7654 unsigned Size = Context.getTypeSizeInChars(T).getQuantity();
Argyrios Kyrtzidis1380a142010-11-18 00:20:36 +00007655 if (Size > LangOpts.NumLargeByValueCopy)
Argyrios Kyrtzidis3532fdd2010-11-17 23:11:54 +00007656 Diag((*Param)->getLocation(), diag::warn_parameter_size)
7657 << (*Param)->getDeclName() << Size;
7658 }
7659}
7660
Abramo Bagnaraff676cb2011-03-08 08:55:46 +00007661ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc,
7662 SourceLocation NameLoc, IdentifierInfo *Name,
7663 QualType T, TypeSourceInfo *TSInfo,
Douglas Gregor16573fa2010-04-19 22:54:31 +00007664 VarDecl::StorageClass StorageClass,
7665 VarDecl::StorageClass StorageClassAsWritten) {
John McCallf85e1932011-06-15 23:02:42 +00007666 // In ARC, infer a lifetime qualifier for appropriate parameter types.
David Blaikie4e4d0842012-03-11 07:00:24 +00007667 if (getLangOpts().ObjCAutoRefCount &&
John McCallf85e1932011-06-15 23:02:42 +00007668 T.getObjCLifetime() == Qualifiers::OCL_None &&
7669 T->isObjCLifetimeType()) {
7670
7671 Qualifiers::ObjCLifetime lifetime;
7672
7673 // Special cases for arrays:
7674 // - if it's const, use __unsafe_unretained
7675 // - otherwise, it's an error
7676 if (T->isArrayType()) {
7677 if (!T.isConstQualified()) {
Fariborz Jahanian175fb102011-10-03 22:11:57 +00007678 DelayedDiagnostics.add(
7679 sema::DelayedDiagnostic::makeForbiddenType(
7680 NameLoc, diag::err_arc_array_param_no_ownership, T, false));
John McCallf85e1932011-06-15 23:02:42 +00007681 }
7682 lifetime = Qualifiers::OCL_ExplicitNone;
7683 } else {
7684 lifetime = T->getObjCARCImplicitLifetime();
7685 }
7686 T = Context.getLifetimeQualifiedType(T, lifetime);
7687 }
7688
Abramo Bagnaraff676cb2011-03-08 08:55:46 +00007689 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name,
Douglas Gregor79e6bd32011-07-12 04:42:08 +00007690 Context.getAdjustedParameterType(T),
7691 TSInfo,
Douglas Gregor16573fa2010-04-19 22:54:31 +00007692 StorageClass, StorageClassAsWritten,
7693 0);
Douglas Gregorcb27b0f2010-04-12 07:48:19 +00007694
7695 // Parameters can not be abstract class types.
7696 // For record types, this is done by the AbstractClassUsageDiagnoser once
7697 // the class has been completely parsed.
7698 if (!CurContext->isRecord() &&
7699 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl,
7700 AbstractParamType))
7701 New->setInvalidDecl();
7702
7703 // Parameter declarators cannot be interface types. All ObjC objects are
7704 // passed by reference.
John McCallc12c5bb2010-05-15 11:32:37 +00007705 if (T->isObjCObjectType()) {
Fariborz Jahanian1de6a6c2012-05-09 21:49:29 +00007706 SourceLocation TypeEndLoc = TSInfo->getTypeLoc().getLocEnd();
Douglas Gregorcb27b0f2010-04-12 07:48:19 +00007707 Diag(NameLoc,
Fariborz Jahanian8eaefdc2011-07-26 17:58:54 +00007708 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T
Fariborz Jahanian1de6a6c2012-05-09 21:49:29 +00007709 << FixItHint::CreateInsertion(TypeEndLoc, "*");
Fariborz Jahanian8eaefdc2011-07-26 17:58:54 +00007710 T = Context.getObjCObjectPointerType(T);
7711 New->setType(T);
Douglas Gregorcb27b0f2010-04-12 07:48:19 +00007712 }
7713
7714 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage
7715 // duration shall not be qualified by an address-space qualifier."
7716 // Since all parameters have automatic store duration, they can not have
7717 // an address space.
7718 if (T.getAddressSpace() != 0) {
7719 Diag(NameLoc, diag::err_arg_with_address_space);
7720 New->setInvalidDecl();
7721 }
7722
7723 return New;
7724}
7725
Douglas Gregora3a83512009-04-01 23:51:29 +00007726void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D,
7727 SourceLocation LocAfterDecls) {
Abramo Bagnara075f8f12010-12-10 16:29:40 +00007728 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
Chris Lattner04421082008-04-08 04:40:51 +00007729
Reid Spencer5f016e22007-07-11 17:01:13 +00007730 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared'
7731 // for a K&R function.
7732 if (!FTI.hasPrototype) {
Douglas Gregor26103482009-04-02 03:14:12 +00007733 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) {
7734 --i;
Chris Lattner04421082008-04-08 04:40:51 +00007735 if (FTI.ArgInfo[i].Param == 0) {
Dylan Noblesmithf7ccbad2012-02-05 02:13:05 +00007736 SmallString<256> Code;
Daniel Dunbar5ffe14c2009-10-18 20:26:27 +00007737 llvm::raw_svector_ostream(Code) << " int "
Daniel Dunbar01eb9b92009-10-18 21:17:35 +00007738 << FTI.ArgInfo[i].Ident->getName()
Daniel Dunbar5ffe14c2009-10-18 20:26:27 +00007739 << ";\n";
Chris Lattner3c73c412008-11-19 08:23:25 +00007740 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared)
Douglas Gregora3a83512009-04-01 23:51:29 +00007741 << FTI.ArgInfo[i].Ident
Douglas Gregor849b2432010-03-31 17:46:05 +00007742 << FixItHint::CreateInsertion(LocAfterDecls, Code.str());
Douglas Gregora3a83512009-04-01 23:51:29 +00007743
Reid Spencer5f016e22007-07-11 17:01:13 +00007744 // Implicitly declare the argument as type 'int' for lack of a better
7745 // type.
John McCall0b7e6782011-03-24 11:26:52 +00007746 AttributeFactory attrs;
7747 DeclSpec DS(attrs);
Chris Lattner04421082008-04-08 04:40:51 +00007748 const char* PrevSpec; // unused
John McCallfec54012009-08-03 20:12:06 +00007749 unsigned DiagID; // unused
Mike Stump1eb44332009-09-09 15:08:12 +00007750 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc,
John McCallfec54012009-08-03 20:12:06 +00007751 PrevSpec, DiagID);
Abramo Bagnara16467f22012-10-04 21:38:29 +00007752 // Use the identifier location for the type source range.
7753 DS.SetRangeStart(FTI.ArgInfo[i].IdentLoc);
7754 DS.SetRangeEnd(FTI.ArgInfo[i].IdentLoc);
Chris Lattner04421082008-04-08 04:40:51 +00007755 Declarator ParamD(DS, Declarator::KNRTypeListContext);
7756 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc);
Douglas Gregorbe109b32009-01-23 16:23:13 +00007757 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD);
Reid Spencer5f016e22007-07-11 17:01:13 +00007758 }
7759 }
Mike Stump1eb44332009-09-09 15:08:12 +00007760 }
Douglas Gregorbe109b32009-01-23 16:23:13 +00007761}
7762
Richard Smith87162c22012-04-17 22:30:01 +00007763Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) {
Douglas Gregorbe109b32009-01-23 16:23:13 +00007764 assert(getCurFunctionDecl() == 0 && "Function parsing confused");
Abramo Bagnara075f8f12010-12-10 16:29:40 +00007765 assert(D.isFunctionDeclarator() && "Not a function declarator!");
Douglas Gregor584049d2008-12-15 23:53:10 +00007766 Scope *ParentScope = FnBodyScope->getParent();
Steve Naroffadbbd0c2008-01-14 20:51:29 +00007767
Douglas Gregor45fa5602011-11-07 20:56:01 +00007768 D.setFunctionDefinitionKind(FDK_Definition);
Benjamin Kramer5354e772012-08-23 23:38:35 +00007769 Decl *DP = HandleDeclarator(ParentScope, D, MultiTemplateParamsArg());
Chris Lattner682bf922009-03-29 16:50:03 +00007770 return ActOnStartOfFunctionDef(FnBodyScope, DP);
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +00007771}
7772
Anders Carlsson8a0086c2012-12-18 01:29:20 +00007773static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD,
7774 const FunctionDecl*& PossibleZeroParamPrototype) {
Anders Carlsson9f89dd72009-12-09 03:30:09 +00007775 // Don't warn about invalid declarations.
7776 if (FD->isInvalidDecl())
7777 return false;
Anders Carlsson63fb6732009-12-09 03:44:46 +00007778
Anders Carlsson9f89dd72009-12-09 03:30:09 +00007779 // Or declarations that aren't global.
7780 if (!FD->isGlobal())
7781 return false;
Anders Carlsson63fb6732009-12-09 03:44:46 +00007782
Anders Carlsson9f89dd72009-12-09 03:30:09 +00007783 // Don't warn about C++ member functions.
7784 if (isa<CXXMethodDecl>(FD))
7785 return false;
Anders Carlsson63fb6732009-12-09 03:44:46 +00007786
Anders Carlsson9f89dd72009-12-09 03:30:09 +00007787 // Don't warn about 'main'.
7788 if (FD->isMain())
7789 return false;
Anders Carlsson63fb6732009-12-09 03:44:46 +00007790
Anders Carlsson9f89dd72009-12-09 03:30:09 +00007791 // Don't warn about inline functions.
John McCall850d3b32011-03-22 07:16:37 +00007792 if (FD->isInlined())
Anders Carlsson9f89dd72009-12-09 03:30:09 +00007793 return false;
Anders Carlsson63fb6732009-12-09 03:44:46 +00007794
7795 // Don't warn about function templates.
7796 if (FD->getDescribedFunctionTemplate())
7797 return false;
7798
7799 // Don't warn about function template specializations.
7800 if (FD->isFunctionTemplateSpecialization())
7801 return false;
7802
Tanya Lattnera95b4f72012-07-26 00:08:28 +00007803 // Don't warn for OpenCL kernels.
7804 if (FD->hasAttr<OpenCLKernelAttr>())
7805 return false;
7806
Anders Carlsson9f89dd72009-12-09 03:30:09 +00007807 bool MissingPrototype = true;
Douglas Gregoref96ee02012-01-14 16:38:05 +00007808 for (const FunctionDecl *Prev = FD->getPreviousDecl();
7809 Prev; Prev = Prev->getPreviousDecl()) {
Anders Carlsson9f89dd72009-12-09 03:30:09 +00007810 // Ignore any declarations that occur in function or method
7811 // scope, because they aren't visible from the header.
7812 if (Prev->getDeclContext()->isFunctionOrMethod())
7813 continue;
7814
7815 MissingPrototype = !Prev->getType()->isFunctionProtoType();
Anders Carlsson8a0086c2012-12-18 01:29:20 +00007816 if (FD->getNumParams() == 0)
7817 PossibleZeroParamPrototype = Prev;
Anders Carlsson9f89dd72009-12-09 03:30:09 +00007818 break;
7819 }
7820
7821 return MissingPrototype;
7822}
7823
Francois Pichetd4a0caf2011-04-22 23:20:44 +00007824void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) {
7825 // Don't complain if we're in GNU89 mode and the previous definition
7826 // was an extern inline function.
7827 const FunctionDecl *Definition;
Sean Hunt10620eb2011-05-06 20:44:56 +00007828 if (FD->isDefined(Definition) &&
David Blaikie4e4d0842012-03-11 07:00:24 +00007829 !canRedefineFunction(Definition, getLangOpts())) {
7830 if (getLangOpts().GNUMode && Definition->isInlineSpecified() &&
Francois Pichetd4a0caf2011-04-22 23:20:44 +00007831 Definition->getStorageClass() == SC_Extern)
7832 Diag(FD->getLocation(), diag::err_redefinition_extern_inline)
David Blaikie4e4d0842012-03-11 07:00:24 +00007833 << FD->getDeclName() << getLangOpts().CPlusPlus;
Francois Pichetd4a0caf2011-04-22 23:20:44 +00007834 else
7835 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName();
7836 Diag(Definition->getLocation(), diag::note_previous_definition);
Richard Smitheef00292012-08-06 02:25:10 +00007837 FD->setInvalidDecl();
Francois Pichetd4a0caf2011-04-22 23:20:44 +00007838 }
7839}
7840
John McCalld226f652010-08-21 09:40:31 +00007841Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) {
Anders Carlsson0ebb6d32009-10-29 15:46:07 +00007842 // Clear the last template instantiation error context.
7843 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation();
7844
Douglas Gregor52591bf2009-06-24 00:54:41 +00007845 if (!D)
7846 return D;
Douglas Gregord83d0402009-08-22 00:34:47 +00007847 FunctionDecl *FD = 0;
Mike Stump1eb44332009-09-09 15:08:12 +00007848
John McCalld226f652010-08-21 09:40:31 +00007849 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D))
Douglas Gregord83d0402009-08-22 00:34:47 +00007850 FD = FunTmpl->getTemplatedDecl();
7851 else
John McCalld226f652010-08-21 09:40:31 +00007852 FD = cast<FunctionDecl>(D);
Douglas Gregor6fc17ff2008-10-29 15:10:40 +00007853
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00007854 // Enter a new function scope
7855 PushFunctionScope();
Mike Stump1eb44332009-09-09 15:08:12 +00007856
Douglas Gregor6fc17ff2008-10-29 15:10:40 +00007857 // See if this is a redefinition.
Francois Pichetd4a0caf2011-04-22 23:20:44 +00007858 if (!FD->isLateTemplateParsed())
7859 CheckForFunctionRedefinition(FD);
Douglas Gregor6fc17ff2008-10-29 15:10:40 +00007860
Douglas Gregorcda9c672009-02-16 17:45:42 +00007861 // Builtin functions cannot be defined.
Douglas Gregor7814e6d2009-09-12 00:22:50 +00007862 if (unsigned BuiltinID = FD->getBuiltinID()) {
Douglas Gregor655753a2009-02-17 16:03:01 +00007863 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) {
Douglas Gregorcda9c672009-02-16 17:45:42 +00007864 Diag(FD->getLocation(), diag::err_builtin_definition) << FD;
Douglas Gregor655753a2009-02-17 16:03:01 +00007865 FD->setInvalidDecl();
7866 }
Douglas Gregorcda9c672009-02-16 17:45:42 +00007867 }
7868
Eli Friedman7f0f5dc2009-03-04 07:30:59 +00007869 // The return type of a function definition must be complete
Douglas Gregore7450f52009-03-24 19:52:54 +00007870 // (C99 6.9.1p3, C++ [dcl.fct]p6).
7871 QualType ResultType = FD->getResultType();
7872 if (!ResultType->isDependentType() && !ResultType->isVoidType() &&
Chris Lattner65e6a092009-04-29 05:12:23 +00007873 !FD->isInvalidDecl() &&
Douglas Gregore7450f52009-03-24 19:52:54 +00007874 RequireCompleteType(FD->getLocation(), ResultType,
7875 diag::err_func_def_incomplete_result))
Eli Friedman7f0f5dc2009-03-04 07:30:59 +00007876 FD->setInvalidDecl();
Eli Friedman7f0f5dc2009-03-04 07:30:59 +00007877
Douglas Gregor8499f3f2009-03-31 16:35:03 +00007878 // GNU warning -Wmissing-prototypes:
7879 // Warn if a global function is defined without a previous
7880 // prototype declaration. This warning is issued even if the
7881 // definition itself provides a prototype. The aim is to detect
7882 // global functions that fail to be declared in header files.
Anders Carlsson8a0086c2012-12-18 01:29:20 +00007883 const FunctionDecl *PossibleZeroParamPrototype = 0;
7884 if (ShouldWarnAboutMissingPrototype(FD, PossibleZeroParamPrototype)) {
Anders Carlsson9f89dd72009-12-09 03:30:09 +00007885 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD;
Anders Carlsson8a0086c2012-12-18 01:29:20 +00007886
7887 if (PossibleZeroParamPrototype) {
7888 // We found a declaration that is not a prototype,
7889 // but that could be a zero-parameter prototype
7890 TypeSourceInfo* TI = PossibleZeroParamPrototype->getTypeSourceInfo();
7891 TypeLoc TL = TI->getTypeLoc();
7892 if (FunctionNoProtoTypeLoc* FTL = dyn_cast<FunctionNoProtoTypeLoc>(&TL))
7893 Diag(PossibleZeroParamPrototype->getLocation(),
7894 diag::note_declaration_not_a_prototype)
7895 << PossibleZeroParamPrototype
7896 << FixItHint::CreateInsertion(FTL->getRParenLoc(), "void");
7897 }
7898 }
Douglas Gregor8499f3f2009-03-31 16:35:03 +00007899
Douglas Gregore2c31ff2009-05-15 17:59:04 +00007900 if (FnBodyScope)
7901 PushDeclContext(FnBodyScope, FD);
Anton Korobeynikov2f402702008-12-26 00:52:02 +00007902
Chris Lattner04421082008-04-08 04:40:51 +00007903 // Check the validity of our function parameters
Douglas Gregor82aa7132010-11-01 18:37:59 +00007904 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(),
7905 /*CheckParameterNames=*/true);
Chris Lattner04421082008-04-08 04:40:51 +00007906
7907 // Introduce our parameters into the function scope
7908 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) {
7909 ParmVarDecl *Param = FD->getParamDecl(p);
Douglas Gregora8cc8ce2009-01-09 18:51:29 +00007910 Param->setOwningFunction(FD);
7911
Chris Lattner04421082008-04-08 04:40:51 +00007912 // If this has an identifier, add it to the scope stack.
John McCall053f4bd2010-03-22 09:20:08 +00007913 if (Param->getIdentifier() && FnBodyScope) {
Argyrios Kyrtzidis08274082010-12-15 18:44:22 +00007914 CheckShadow(FnBodyScope, Param);
John McCall053f4bd2010-03-22 09:20:08 +00007915
Argyrios Kyrtzidis87f3ff02008-04-12 00:47:19 +00007916 PushOnScopeChains(Param, FnBodyScope);
John McCall053f4bd2010-03-22 09:20:08 +00007917 }
Reid Spencer5f016e22007-07-11 17:01:13 +00007918 }
Chris Lattner04421082008-04-08 04:40:51 +00007919
James Molloy16f1f712012-02-29 10:24:19 +00007920 // If we had any tags defined in the function prototype,
7921 // introduce them into the function scope.
7922 if (FnBodyScope) {
7923 for (llvm::ArrayRef<NamedDecl*>::iterator I = FD->getDeclsInPrototypeScope().begin(),
7924 E = FD->getDeclsInPrototypeScope().end(); I != E; ++I) {
7925 NamedDecl *D = *I;
7926
7927 // Some of these decls (like enums) may have been pinned to the translation unit
7928 // for lack of a real context earlier. If so, remove from the translation unit
7929 // and reattach to the current context.
7930 if (D->getLexicalDeclContext() == Context.getTranslationUnitDecl()) {
7931 // Is the decl actually in the context?
7932 for (DeclContext::decl_iterator DI = Context.getTranslationUnitDecl()->decls_begin(),
7933 DE = Context.getTranslationUnitDecl()->decls_end(); DI != DE; ++DI) {
7934 if (*DI == D) {
7935 Context.getTranslationUnitDecl()->removeDecl(D);
7936 break;
7937 }
7938 }
7939 // Either way, reassign the lexical decl context to our FunctionDecl.
7940 D->setLexicalDeclContext(CurContext);
7941 }
7942
7943 // If the decl has a non-null name, make accessible in the current scope.
7944 if (!D->getName().empty())
7945 PushOnScopeChains(D, FnBodyScope, /*AddToContext=*/false);
7946
7947 // Similarly, dive into enums and fish their constants out, making them
7948 // accessible in this scope.
7949 if (EnumDecl *ED = dyn_cast<EnumDecl>(D)) {
7950 for (EnumDecl::enumerator_iterator EI = ED->enumerator_begin(),
7951 EE = ED->enumerator_end(); EI != EE; ++EI)
David Blaikie581deb32012-06-06 20:45:41 +00007952 PushOnScopeChains(*EI, FnBodyScope, /*AddToContext=*/false);
James Molloy16f1f712012-02-29 10:24:19 +00007953 }
7954 }
7955 }
7956
Richard Smith87162c22012-04-17 22:30:01 +00007957 // Ensure that the function's exception specification is instantiated.
7958 if (const FunctionProtoType *FPT = FD->getType()->getAs<FunctionProtoType>())
7959 ResolveExceptionSpec(D->getLocation(), FPT);
7960
Anton Korobeynikov2f402702008-12-26 00:52:02 +00007961 // Checking attributes of current function definition
7962 // dllimport attribute.
Sean Huntcf807c42010-08-18 23:23:40 +00007963 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>();
7964 if (DA && (!FD->getAttr<DLLExportAttr>())) {
7965 // dllimport attribute cannot be directly applied to definition.
Francois Pichetb613cd62011-03-29 10:39:17 +00007966 // Microsoft accepts dllimport for functions defined within class scope.
7967 if (!DA->isInherited() &&
Francois Pichet62ec1f22011-09-17 17:15:52 +00007968 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) {
Anton Korobeynikov2f402702008-12-26 00:52:02 +00007969 Diag(FD->getLocation(),
7970 diag::err_attribute_can_be_applied_only_to_symbol_declaration)
7971 << "dllimport";
7972 FD->setInvalidDecl();
Argyrios Kyrtzidisa9990e82012-12-14 06:54:03 +00007973 return D;
Ted Kremenek12911a82010-02-21 05:12:53 +00007974 }
7975
7976 // Visual C++ appears to not think this is an issue, so only issue
7977 // a warning when Microsoft extensions are disabled.
Francois Pichet62ec1f22011-09-17 17:15:52 +00007978 if (!LangOpts.MicrosoftExt) {
Anton Korobeynikov2f402702008-12-26 00:52:02 +00007979 // If a symbol previously declared dllimport is later defined, the
7980 // attribute is ignored in subsequent references, and a warning is
7981 // emitted.
7982 Diag(FD->getLocation(),
7983 diag::warn_redeclaration_without_attribute_prev_attribute_ignored)
Daniel Dunbar4087f272010-08-17 22:39:59 +00007984 << FD->getName() << "dllimport";
Anton Korobeynikov2f402702008-12-26 00:52:02 +00007985 }
7986 }
Dmitri Gribenkoc41ace92012-08-14 17:17:18 +00007987 // We want to attach documentation to original Decl (which might be
7988 // a function template).
7989 ActOnDocumentableDecl(D);
Argyrios Kyrtzidisa9990e82012-12-14 06:54:03 +00007990 return D;
Reid Spencer5f016e22007-07-11 17:01:13 +00007991}
7992
Douglas Gregor5077c382010-05-15 06:01:05 +00007993/// \brief Given the set of return statements within a function body,
7994/// compute the variables that are subject to the named return value
7995/// optimization.
7996///
7997/// Each of the variables that is subject to the named return value
7998/// optimization will be marked as NRVO variables in the AST, and any
7999/// return statement that has a marked NRVO variable as its NRVO candidate can
8000/// use the named return value optimization.
8001///
8002/// This function applies a very simplistic algorithm for NRVO: if every return
8003/// statement in the function has the same NRVO candidate, that candidate is
8004/// the NRVO variable.
8005///
8006/// FIXME: Employ a smarter algorithm that accounts for multiple return
8007/// statements and the lifetimes of the NRVO candidates. We should be able to
8008/// find a maximal set of NRVO variables.
Douglas Gregorf8b7f712011-09-06 20:46:03 +00008009void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) {
John McCall781472f2010-08-25 08:40:02 +00008010 ReturnStmt **Returns = Scope->Returns.data();
8011
Douglas Gregor5077c382010-05-15 06:01:05 +00008012 const VarDecl *NRVOCandidate = 0;
John McCall781472f2010-08-25 08:40:02 +00008013 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) {
Douglas Gregor5077c382010-05-15 06:01:05 +00008014 if (!Returns[I]->getNRVOCandidate())
8015 return;
8016
8017 if (!NRVOCandidate)
8018 NRVOCandidate = Returns[I]->getNRVOCandidate();
8019 else if (NRVOCandidate != Returns[I]->getNRVOCandidate())
8020 return;
8021 }
8022
8023 if (NRVOCandidate)
8024 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true);
8025}
8026
Richard Smith1a5bd5d2012-11-19 21:13:18 +00008027bool Sema::canSkipFunctionBody(Decl *D) {
Richard Smithd1bac8d2012-11-27 21:31:01 +00008028 if (!Consumer.shouldSkipFunctionBody(D))
8029 return false;
8030
Richard Smith1a5bd5d2012-11-19 21:13:18 +00008031 if (isa<ObjCMethodDecl>(D))
8032 return true;
8033
8034 FunctionDecl *FD = 0;
8035 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(D))
8036 FD = FTD->getTemplatedDecl();
8037 else
8038 FD = cast<FunctionDecl>(D);
8039
8040 // We cannot skip the body of a function (or function template) which is
8041 // constexpr, since we may need to evaluate its body in order to parse the
8042 // rest of the file.
8043 return !FD->isConstexpr();
8044}
8045
Argyrios Kyrtzidis35f3f362012-12-06 18:59:10 +00008046Decl *Sema::ActOnSkippedFunctionBody(Decl *Decl) {
8047 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(Decl))
8048 FD->setHasSkippedBody();
8049 else if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(Decl))
8050 MD->setHasSkippedBody();
8051 return ActOnFinishFunctionBody(Decl, 0);
8052}
8053
John McCallf312b1e2010-08-26 23:41:50 +00008054Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) {
Benjamin Kramer3fe198b2012-08-23 21:35:17 +00008055 return ActOnFinishFunctionBody(D, BodyArg, false);
Douglas Gregore2c31ff2009-05-15 17:59:04 +00008056}
8057
John McCall9ae2f072010-08-23 23:25:46 +00008058Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body,
8059 bool IsInstantiation) {
Douglas Gregord83d0402009-08-22 00:34:47 +00008060 FunctionDecl *FD = 0;
8061 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl);
8062 if (FunTmpl)
8063 FD = FunTmpl->getTemplatedDecl();
8064 else
8065 FD = dyn_cast_or_null<FunctionDecl>(dcl);
8066
Ted Kremenekd064fdc2010-03-23 00:13:23 +00008067 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy();
Ted Kremenek3ed6fc02011-02-23 01:51:48 +00008068 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0;
Ted Kremenekdbdbaaf2010-03-20 21:06:02 +00008069
Douglas Gregord83d0402009-08-22 00:34:47 +00008070 if (FD) {
Chris Lattnera5251fc2009-04-18 09:36:27 +00008071 FD->setBody(Body);
John McCall75d8ba32012-02-14 19:50:52 +00008072
8073 // If the function implicitly returns zero (like 'main') or is naked,
8074 // don't complain about missing return statements.
8075 if (FD->hasImplicitReturnZero() || FD->hasAttr<NakedAttr>())
Ted Kremenekd064fdc2010-03-23 00:13:23 +00008076 WP.disableCheckFallThrough();
Mike Stump1eb44332009-09-09 15:08:12 +00008077
Francois Pichet6a247472011-05-11 02:14:46 +00008078 // MSVC permits the use of pure specifier (=0) on function definition,
8079 // defined at class scope, warn about this non standard construct.
David Blaikie4e4d0842012-03-11 07:00:24 +00008080 if (getLangOpts().MicrosoftExt && FD->isPure())
Francois Pichet6a247472011-05-11 02:14:46 +00008081 Diag(FD->getLocation(), diag::warn_pure_function_definition);
8082
Douglas Gregor6fb745b2010-05-13 16:44:06 +00008083 if (!FD->isInvalidDecl()) {
Douglas Gregore0762c92009-06-19 23:52:42 +00008084 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end());
Argyrios Kyrtzidis3532fdd2010-11-17 23:11:54 +00008085 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(),
8086 FD->getResultType(), FD);
Douglas Gregor6fb745b2010-05-13 16:44:06 +00008087
8088 // If this is a constructor, we need a vtable.
8089 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD))
8090 MarkVTableUsed(FD->getLocation(), Constructor->getParent());
Douglas Gregor5077c382010-05-15 06:01:05 +00008091
Jordan Rose7dd900e2012-07-02 21:19:23 +00008092 // Try to apply the named return value optimization. We have to check
8093 // if we can do this here because lambdas keep return statements around
8094 // to deduce an implicit return type.
8095 if (getLangOpts().CPlusPlus && FD->getResultType()->isRecordType() &&
8096 !FD->isDependentContext())
8097 computeNRVO(Body, getCurFunction());
Douglas Gregor6fb745b2010-05-13 16:44:06 +00008098 }
8099
Douglas Gregor76e3da52012-02-08 20:17:14 +00008100 assert((FD == getCurFunctionDecl() || getCurLambda()->CallOperator == FD) &&
8101 "Function parsing confused");
Steve Naroff394f3f42008-07-25 17:57:26 +00008102 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) {
Chris Lattnerffed1632009-02-16 19:27:54 +00008103 assert(MD == getCurMethodDecl() && "Method parsing confused");
Chris Lattnera5251fc2009-04-18 09:36:27 +00008104 MD->setBody(Body);
Argyrios Kyrtzidis3532fdd2010-11-17 23:11:54 +00008105 if (!MD->isInvalidDecl()) {
Douglas Gregore0762c92009-06-19 23:52:42 +00008106 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end());
Argyrios Kyrtzidis3532fdd2010-11-17 23:11:54 +00008107 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(),
8108 MD->getResultType(), MD);
Douglas Gregorf7603f62011-09-06 20:33:37 +00008109
8110 if (Body)
Douglas Gregorf8b7f712011-09-06 20:46:03 +00008111 computeNRVO(Body, getCurFunction());
Argyrios Kyrtzidis3532fdd2010-11-17 23:11:54 +00008112 }
Jordan Rose535a5d02012-10-19 16:05:26 +00008113 if (getCurFunction()->ObjCShouldCallSuper) {
Fariborz Jahanian9f559832012-09-10 16:51:09 +00008114 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_call)
8115 << MD->getSelector().getAsString();
Jordan Rose535a5d02012-10-19 16:05:26 +00008116 getCurFunction()->ObjCShouldCallSuper = false;
Nico Weber80cb6e62011-08-28 22:35:17 +00008117 }
Ted Kremenek8189cde2009-02-07 01:47:29 +00008118 } else {
John McCalld226f652010-08-21 09:40:31 +00008119 return 0;
Ted Kremenek8189cde2009-02-07 01:47:29 +00008120 }
Douglas Gregore2c31ff2009-05-15 17:59:04 +00008121
Jordan Rose535a5d02012-10-19 16:05:26 +00008122 assert(!getCurFunction()->ObjCShouldCallSuper &&
Eli Friedman95aac152012-08-01 21:02:59 +00008123 "This should only be set for ObjC methods, which should have been "
8124 "handled in the block above.");
Nico Weber9a1ecf02011-08-22 17:25:57 +00008125
Reid Spencer5f016e22007-07-11 17:01:13 +00008126 // Verify and clean out per-function state.
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00008127 if (Body) {
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00008128 // C++ constructors that have function-try-blocks can't have return
8129 // statements in the handlers of that block. (C++ [except.handle]p14)
8130 // Verify this.
8131 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body))
8132 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body));
8133
Richard Smith37bee672011-08-12 18:44:32 +00008134 // Verify that gotos and switch cases don't jump into scopes illegally.
John McCall781472f2010-08-25 08:40:02 +00008135 if (getCurFunction()->NeedsScopeChecking() &&
John McCall8a2ca742010-05-20 07:13:26 +00008136 !dcl->isInvalidDecl() &&
Douglas Gregor27bec772012-08-17 05:12:08 +00008137 !hasAnyUnrecoverableErrorsInThisFunction() &&
8138 !PP.isCodeCompletionEnabled())
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00008139 DiagnoseInvalidJumps(Body);
Mike Stump1eb44332009-09-09 15:08:12 +00008140
John McCall15442822010-08-04 01:04:25 +00008141 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) {
8142 if (!Destructor->getParent()->isDependentType())
8143 CheckDestructor(Destructor);
8144
John McCallef027fe2010-03-16 21:39:52 +00008145 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(),
8146 Destructor->getParent());
John McCall15442822010-08-04 01:04:25 +00008147 }
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00008148
8149 // If any errors have occurred, clear out any temporaries that may have
8150 // been leftover. This ensures that these temporaries won't be picked up for
8151 // deletion in some later function.
Douglas Gregor26cd44d2011-03-04 23:08:02 +00008152 if (PP.getDiagnostics().hasErrorOccurred() ||
John McCallf85e1932011-06-15 23:02:42 +00008153 PP.getDiagnostics().getSuppressAllDiagnostics()) {
John McCall80ee6e82011-11-10 05:35:25 +00008154 DiscardCleanupsInEvaluationContext();
DeLesley Hutchins12f37e42012-12-07 22:53:48 +00008155 }
8156 if (!PP.getDiagnostics().hasUncompilableErrorOccurred() &&
8157 !isa<FunctionTemplateDecl>(dcl)) {
Ted Kremenekdbdbaaf2010-03-20 21:06:02 +00008158 // Since the body is valid, issue any analysis-based warnings that are
8159 // enabled.
Ted Kremenek3ed6fc02011-02-23 01:51:48 +00008160 ActivePolicy = &WP;
Ted Kremenekdbdbaaf2010-03-20 21:06:02 +00008161 }
8162
Richard Smith86c3ae42012-02-13 03:54:03 +00008163 if (!IsInstantiation && FD && FD->isConstexpr() && !FD->isInvalidDecl() &&
8164 (!CheckConstexprFunctionDecl(FD) ||
8165 !CheckConstexprFunctionBody(FD, Body)))
Richard Smith9f569cc2011-10-01 02:31:28 +00008166 FD->setInvalidDecl();
8167
John McCall80ee6e82011-11-10 05:35:25 +00008168 assert(ExprCleanupObjects.empty() && "Leftover temporaries in function");
John McCallf85e1932011-06-15 23:02:42 +00008169 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function");
Eli Friedmand2cce132012-02-02 23:15:15 +00008170 assert(MaybeODRUseExprs.empty() &&
8171 "Leftover expressions for odr-use checking");
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00008172 }
8173
John McCall90f97892010-03-25 22:08:03 +00008174 if (!IsInstantiation)
8175 PopDeclContext();
8176
Eli Friedmanec9ea722012-01-05 03:35:19 +00008177 PopFunctionScopeInfo(ActivePolicy, dcl);
Anders Carlssonf8a9a792009-11-13 19:21:49 +00008178
Douglas Gregord5b57282009-11-15 07:07:58 +00008179 // If any errors have occurred, clear out any temporaries that may have
8180 // been leftover. This ensures that these temporaries won't be picked up for
8181 // deletion in some later function.
John McCallf85e1932011-06-15 23:02:42 +00008182 if (getDiagnostics().hasErrorOccurred()) {
John McCall80ee6e82011-11-10 05:35:25 +00008183 DiscardCleanupsInEvaluationContext();
John McCallf85e1932011-06-15 23:02:42 +00008184 }
Argyrios Kyrtzidis49b96d12010-08-13 18:42:17 +00008185
John McCalld226f652010-08-21 09:40:31 +00008186 return dcl;
Fariborz Jahanian60fbca02007-11-10 16:31:34 +00008187}
8188
Caitlin Sadowskieff98fc2011-09-08 17:42:22 +00008189
8190/// When we finish delayed parsing of an attribute, we must attach it to the
8191/// relevant Decl.
8192void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D,
8193 ParsedAttributes &Attrs) {
DeLesley Hutchins7b9ff0c2012-01-20 22:37:06 +00008194 // Always attach attributes to the underlying decl.
8195 if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D))
8196 D = TD->getTemplatedDecl();
Douglas Gregorcefc3af2012-04-16 07:05:22 +00008197 ProcessDeclAttributeList(S, D, Attrs.getList());
8198
8199 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(D))
8200 if (Method->isStatic())
8201 checkThisInStaticMemberFunctionAttributes(Method);
Caitlin Sadowskieff98fc2011-09-08 17:42:22 +00008202}
8203
8204
Reid Spencer5f016e22007-07-11 17:01:13 +00008205/// ImplicitlyDefineFunction - An undeclared identifier was used in a function
8206/// call, forming a call to an implicitly defined function (per C99 6.5.1p2).
Mike Stump1eb44332009-09-09 15:08:12 +00008207NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc,
Douglas Gregor4afa39d2009-01-20 01:17:11 +00008208 IdentifierInfo &II, Scope *S) {
Douglas Gregor63935192009-03-02 00:19:53 +00008209 // Before we produce a declaration for an implicitly defined
8210 // function, see whether there was a locally-scoped declaration of
8211 // this name as a function or variable. If so, use that
8212 // (non-visible) declaration, and complain about it.
8213 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
Douglas Gregorec12ce22011-07-28 14:20:37 +00008214 = findLocallyScopedExternalDecl(&II);
Douglas Gregor63935192009-03-02 00:19:53 +00008215 if (Pos != LocallyScopedExternalDecls.end()) {
8216 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second;
8217 Diag(Pos->second->getLocation(), diag::note_previous_declaration);
8218 return Pos->second;
8219 }
8220
Chris Lattner37d10842008-05-05 21:18:06 +00008221 // Extension in C99. Legal in C90, but warn about it.
Hans Wennborge3ca33a2011-12-08 15:56:07 +00008222 unsigned diag_id;
Daniel Dunbar01eb9b92009-10-18 21:17:35 +00008223 if (II.getName().startswith("__builtin_"))
Abramo Bagnara753a2002012-01-09 10:05:48 +00008224 diag_id = diag::warn_builtin_unknown;
David Blaikie4e4d0842012-03-11 07:00:24 +00008225 else if (getLangOpts().C99)
Hans Wennborge3ca33a2011-12-08 15:56:07 +00008226 diag_id = diag::ext_implicit_function_decl;
Chris Lattner37d10842008-05-05 21:18:06 +00008227 else
Hans Wennborge3ca33a2011-12-08 15:56:07 +00008228 diag_id = diag::warn_implicit_function_decl;
8229 Diag(Loc, diag_id) << &II;
Mike Stump1eb44332009-09-09 15:08:12 +00008230
Hans Wennborge3ca33a2011-12-08 15:56:07 +00008231 // Because typo correction is expensive, only do it if the implicit
8232 // function declaration is going to be treated as an error.
8233 if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) {
8234 TypoCorrection Corrected;
Kaelyn Uhrain43e875d2012-01-18 21:41:41 +00008235 DeclFilterCCC<FunctionDecl> Validator;
Hans Wennborge3ca33a2011-12-08 15:56:07 +00008236 if (S && (Corrected = CorrectTypo(DeclarationNameInfo(&II, Loc),
Kaelyn Uhrain16e46dd2012-01-31 23:49:25 +00008237 LookupOrdinaryName, S, 0, Validator))) {
David Blaikie4e4d0842012-03-11 07:00:24 +00008238 std::string CorrectedStr = Corrected.getAsString(getLangOpts());
8239 std::string CorrectedQuotedStr = Corrected.getQuoted(getLangOpts());
Kaelyn Uhrain43e875d2012-01-18 21:41:41 +00008240 FunctionDecl *Func = Corrected.getCorrectionDeclAs<FunctionDecl>();
Hans Wennborge3ca33a2011-12-08 15:56:07 +00008241
Kaelyn Uhrain43e875d2012-01-18 21:41:41 +00008242 Diag(Loc, diag::note_function_suggestion) << CorrectedQuotedStr
8243 << FixItHint::CreateReplacement(Loc, CorrectedStr);
Hans Wennborge3ca33a2011-12-08 15:56:07 +00008244
Kaelyn Uhrain43e875d2012-01-18 21:41:41 +00008245 if (Func->getLocation().isValid()
8246 && !II.getName().startswith("__builtin_"))
8247 Diag(Func->getLocation(), diag::note_previous_decl)
8248 << CorrectedQuotedStr;
Hans Wennborge3ca33a2011-12-08 15:56:07 +00008249 }
Hans Wennborg122de3e2011-12-06 09:46:12 +00008250 }
8251
Reid Spencer5f016e22007-07-11 17:01:13 +00008252 // Set a Declarator for the implicit definition: int foo();
8253 const char *Dummy;
John McCall0b7e6782011-03-24 11:26:52 +00008254 AttributeFactory attrFactory;
8255 DeclSpec DS(attrFactory);
John McCallfec54012009-08-03 20:12:06 +00008256 unsigned DiagID;
8257 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID);
Jeffrey Yasskinc6ed7292010-12-23 01:01:28 +00008258 (void)Error; // Silence warning.
Reid Spencer5f016e22007-07-11 17:01:13 +00008259 assert(!Error && "Error setting up implicit decl!");
Abramo Bagnara59c0a812012-10-04 21:42:10 +00008260 SourceLocation NoLoc;
Reid Spencer5f016e22007-07-11 17:01:13 +00008261 Declarator D(DS, Declarator::BlockContext);
Abramo Bagnara59c0a812012-10-04 21:42:10 +00008262 D.AddTypeInfo(DeclaratorChunk::getFunction(/*HasProto=*/false,
8263 /*IsAmbiguous=*/false,
8264 /*RParenLoc=*/NoLoc,
8265 /*ArgInfo=*/0,
8266 /*NumArgs=*/0,
8267 /*EllipsisLoc=*/NoLoc,
8268 /*RParenLoc=*/NoLoc,
8269 /*TypeQuals=*/0,
8270 /*RefQualifierIsLvalueRef=*/true,
8271 /*RefQualifierLoc=*/NoLoc,
8272 /*ConstQualifierLoc=*/NoLoc,
8273 /*VolatileQualifierLoc=*/NoLoc,
8274 /*MutableLoc=*/NoLoc,
8275 EST_None,
8276 /*ESpecLoc=*/NoLoc,
8277 /*Exceptions=*/0,
8278 /*ExceptionRanges=*/0,
8279 /*NumExceptions=*/0,
8280 /*NoexceptExpr=*/0,
8281 Loc, Loc, D),
John McCall0b7e6782011-03-24 11:26:52 +00008282 DS.getAttributes(),
Sebastian Redlab197ba2009-02-09 18:23:29 +00008283 SourceLocation());
Reid Spencer5f016e22007-07-11 17:01:13 +00008284 D.SetIdentifier(&II, Loc);
Sebastian Redlab197ba2009-02-09 18:23:29 +00008285
Argyrios Kyrtzidis93213bb2008-05-01 21:04:16 +00008286 // Insert this function into translation-unit scope.
8287
8288 DeclContext *PrevDC = CurContext;
8289 CurContext = Context.getTranslationUnitDecl();
Mike Stump1eb44332009-09-09 15:08:12 +00008290
John McCalld226f652010-08-21 09:40:31 +00008291 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D));
Steve Naroffe2ef8152008-04-04 14:32:09 +00008292 FD->setImplicit();
Argyrios Kyrtzidis93213bb2008-05-01 21:04:16 +00008293
8294 CurContext = PrevDC;
8295
Douglas Gregor3c385e52009-02-14 18:57:46 +00008296 AddKnownFunctionAttributes(FD);
8297
Steve Naroffe2ef8152008-04-04 14:32:09 +00008298 return FD;
Reid Spencer5f016e22007-07-11 17:01:13 +00008299}
8300
Douglas Gregor3c385e52009-02-14 18:57:46 +00008301/// \brief Adds any function attributes that we know a priori based on
8302/// the declaration of this function.
8303///
8304/// These attributes can apply both to implicitly-declared builtins
8305/// (like __builtin___printf_chk) or to library-declared functions
8306/// like NSLog or printf.
Douglas Gregorb30cd4a2011-06-15 05:45:11 +00008307///
8308/// We need to check for duplicate attributes both here and where user-written
8309/// attributes are applied to declarations.
Douglas Gregor3c385e52009-02-14 18:57:46 +00008310void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) {
8311 if (FD->isInvalidDecl())
8312 return;
8313
8314 // If this is a built-in function, map its builtin attributes to
8315 // actual attributes.
Douglas Gregor7814e6d2009-09-12 00:22:50 +00008316 if (unsigned BuiltinID = FD->getBuiltinID()) {
Douglas Gregor3c385e52009-02-14 18:57:46 +00008317 // Handle printf-formatting attributes.
8318 unsigned FormatIdx;
8319 bool HasVAListArg;
8320 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) {
Jean-Daniel Dupas1acbe5e2012-01-24 22:32:46 +00008321 if (!FD->getAttr<FormatAttr>()) {
8322 const char *fmt = "printf";
8323 unsigned int NumParams = FD->getNumParams();
8324 if (FormatIdx < NumParams && // NumParams may be 0 (e.g. vfprintf)
8325 FD->getParamDecl(FormatIdx)->getType()->isObjCObjectPointerType())
8326 fmt = "NSString";
Sean Huntcf807c42010-08-18 23:23:40 +00008327 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context,
Jean-Daniel Dupas1acbe5e2012-01-24 22:32:46 +00008328 fmt, FormatIdx+1,
Ted Kremenek3d2c43e2010-02-11 05:28:37 +00008329 HasVAListArg ? 0 : FormatIdx+2));
Jean-Daniel Dupas1acbe5e2012-01-24 22:32:46 +00008330 }
Douglas Gregor3c385e52009-02-14 18:57:46 +00008331 }
Ted Kremenekbee05c12010-07-16 02:11:15 +00008332 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx,
8333 HasVAListArg)) {
8334 if (!FD->getAttr<FormatAttr>())
Sean Huntcf807c42010-08-18 23:23:40 +00008335 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context,
8336 "scanf", FormatIdx+1,
Ted Kremenekbee05c12010-07-16 02:11:15 +00008337 HasVAListArg ? 0 : FormatIdx+2));
8338 }
Daniel Dunbaref2abfe2009-02-16 22:43:43 +00008339
8340 // Mark const if we don't care about errno and that is the only
8341 // thing preventing the function from being const. This allows
8342 // IRgen to use LLVM intrinsics for such functions.
David Blaikie4e4d0842012-03-11 07:00:24 +00008343 if (!getLangOpts().MathErrno &&
Daniel Dunbaref2abfe2009-02-16 22:43:43 +00008344 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) {
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00008345 if (!FD->getAttr<ConstAttr>())
Sean Huntcf807c42010-08-18 23:23:40 +00008346 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context));
Daniel Dunbaref2abfe2009-02-16 22:43:43 +00008347 }
Mike Stump0feecbb2009-07-27 19:14:18 +00008348
Rafael Espindola67004152011-10-12 19:51:18 +00008349 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) &&
8350 !FD->getAttr<ReturnsTwiceAttr>())
8351 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context));
Douglas Gregorb30cd4a2011-06-15 05:45:11 +00008352 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>())
Sean Huntcf807c42010-08-18 23:23:40 +00008353 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context));
Douglas Gregorb30cd4a2011-06-15 05:45:11 +00008354 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>())
Sean Huntcf807c42010-08-18 23:23:40 +00008355 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context));
Douglas Gregor3c385e52009-02-14 18:57:46 +00008356 }
8357
8358 IdentifierInfo *Name = FD->getIdentifier();
8359 if (!Name)
8360 return;
David Blaikie4e4d0842012-03-11 07:00:24 +00008361 if ((!getLangOpts().CPlusPlus &&
Douglas Gregor3c385e52009-02-14 18:57:46 +00008362 FD->getDeclContext()->isTranslationUnit()) ||
8363 (isa<LinkageSpecDecl>(FD->getDeclContext()) &&
Mike Stump1eb44332009-09-09 15:08:12 +00008364 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() ==
Douglas Gregor3c385e52009-02-14 18:57:46 +00008365 LinkageSpecDecl::lang_c)) {
8366 // Okay: this could be a libc/libm/Objective-C function we know
8367 // about.
8368 } else
8369 return;
8370
Jean-Daniel Dupas1acbe5e2012-01-24 22:32:46 +00008371 if (Name->isStr("asprintf") || Name->isStr("vasprintf")) {
Mike Stump523a8fd2009-07-28 00:07:08 +00008372 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be
Mike Stump1eb44332009-09-09 15:08:12 +00008373 // target-specific builtins, perhaps?
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00008374 if (!FD->getAttr<FormatAttr>())
Sean Huntcf807c42010-08-18 23:23:40 +00008375 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context,
8376 "printf", 2,
Eli Friedmand7dad722009-06-10 04:01:38 +00008377 Name->isStr("vasprintf") ? 0 : 3));
Mike Stump782fa302009-07-28 02:25:19 +00008378 }
Jordan Rose8a64f882012-08-08 21:17:31 +00008379
8380 if (Name->isStr("__CFStringMakeConstantString")) {
8381 // We already have a __builtin___CFStringMakeConstantString,
8382 // but builds that use -fno-constant-cfstrings don't go through that.
8383 if (!FD->getAttr<FormatArgAttr>())
8384 FD->addAttr(::new (Context) FormatArgAttr(FD->getLocation(), Context, 1));
8385 }
Douglas Gregor3c385e52009-02-14 18:57:46 +00008386}
Reid Spencer5f016e22007-07-11 17:01:13 +00008387
John McCallba6a9bd2009-10-24 08:00:42 +00008388TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T,
John McCalla93c9342009-12-07 02:54:59 +00008389 TypeSourceInfo *TInfo) {
Reid Spencer5f016e22007-07-11 17:01:13 +00008390 assert(D.getIdentifier() && "Wrong callback for declspec without declarator");
Steve Naroff5912a352007-08-28 20:14:24 +00008391 assert(!T.isNull() && "GetTypeForDeclarator() returned null type");
Mike Stump1eb44332009-09-09 15:08:12 +00008392
John McCalla93c9342009-12-07 02:54:59 +00008393 if (!TInfo) {
John McCallba6a9bd2009-10-24 08:00:42 +00008394 assert(D.isInvalidType() && "no declarator info for valid type");
John McCalla93c9342009-12-07 02:54:59 +00008395 TInfo = Context.getTrivialTypeSourceInfo(T);
John McCallba6a9bd2009-10-24 08:00:42 +00008396 }
8397
Reid Spencer5f016e22007-07-11 17:01:13 +00008398 // Scope manipulation handled by caller.
Chris Lattner0ed844b2008-04-04 06:12:32 +00008399 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext,
Daniel Dunbar96a00142012-03-09 18:35:03 +00008400 D.getLocStart(),
Chris Lattner0ed844b2008-04-04 06:12:32 +00008401 D.getIdentifierLoc(),
Mike Stump1eb44332009-09-09 15:08:12 +00008402 D.getIdentifier(),
John McCalla93c9342009-12-07 02:54:59 +00008403 TInfo);
Mike Stump1eb44332009-09-09 15:08:12 +00008404
John McCallcde5a402011-02-01 08:20:08 +00008405 // Bail out immediately if we have an invalid declaration.
8406 if (D.isInvalidType()) {
8407 NewTD->setInvalidDecl();
8408 return NewTD;
Anders Carlsson4843e582009-03-10 17:07:44 +00008409 }
8410
Douglas Gregore3895852011-09-12 18:37:38 +00008411 if (D.getDeclSpec().isModulePrivateSpecified()) {
8412 if (CurContext->isFunctionOrMethod())
8413 Diag(NewTD->getLocation(), diag::err_module_private_local)
8414 << 2 << NewTD->getDeclName()
8415 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc())
8416 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc());
8417 else
8418 NewTD->setModulePrivate();
8419 }
Douglas Gregor8d267c52011-09-09 02:06:17 +00008420
John McCallcde5a402011-02-01 08:20:08 +00008421 // C++ [dcl.typedef]p8:
8422 // If the typedef declaration defines an unnamed class (or
8423 // enum), the first typedef-name declared by the declaration
8424 // to be that class type (or enum type) is used to denote the
8425 // class type (or enum type) for linkage purposes only.
8426 // We need to check whether the type was declared in the declaration.
8427 switch (D.getDeclSpec().getTypeSpecType()) {
8428 case TST_enum:
8429 case TST_struct:
Joao Matos6666ed42012-08-31 18:45:21 +00008430 case TST_interface:
John McCallcde5a402011-02-01 08:20:08 +00008431 case TST_union:
8432 case TST_class: {
8433 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl());
8434
8435 // Do nothing if the tag is not anonymous or already has an
8436 // associated typedef (from an earlier typedef in this decl group).
8437 if (tagFromDeclSpec->getIdentifier()) break;
Richard Smith162e1c12011-04-15 14:24:37 +00008438 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break;
John McCallcde5a402011-02-01 08:20:08 +00008439
8440 // A well-formed anonymous tag must always be a TUK_Definition.
8441 assert(tagFromDeclSpec->isThisDeclarationADefinition());
8442
8443 // The type must match the tag exactly; no qualifiers allowed.
8444 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec)))
8445 break;
8446
8447 // Otherwise, set this is the anon-decl typedef for the tag.
Richard Smith162e1c12011-04-15 14:24:37 +00008448 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD);
John McCallcde5a402011-02-01 08:20:08 +00008449 break;
8450 }
8451
8452 default:
8453 break;
8454 }
8455
Steve Naroff5912a352007-08-28 20:14:24 +00008456 return NewTD;
Reid Spencer5f016e22007-07-11 17:01:13 +00008457}
8458
Douglas Gregor501c5ce2009-05-14 16:41:31 +00008459
Richard Smithf1c66b42012-03-14 23:13:10 +00008460/// \brief Check that this is a valid underlying type for an enum declaration.
8461bool Sema::CheckEnumUnderlyingType(TypeSourceInfo *TI) {
8462 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc();
8463 QualType T = TI->getType();
8464
Eli Friedman2fcff832012-12-18 02:37:32 +00008465 if (T->isDependentType())
Richard Smithf1c66b42012-03-14 23:13:10 +00008466 return false;
8467
Eli Friedman2fcff832012-12-18 02:37:32 +00008468 if (const BuiltinType *BT = T->getAs<BuiltinType>())
8469 if (BT->isInteger())
8470 return false;
8471
Richard Smithf1c66b42012-03-14 23:13:10 +00008472 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) << T;
8473 return true;
8474}
8475
8476/// Check whether this is a valid redeclaration of a previous enumeration.
8477/// \return true if the redeclaration was invalid.
8478bool Sema::CheckEnumRedeclaration(SourceLocation EnumLoc, bool IsScoped,
8479 QualType EnumUnderlyingTy,
8480 const EnumDecl *Prev) {
8481 bool IsFixed = !EnumUnderlyingTy.isNull();
8482
8483 if (IsScoped != Prev->isScoped()) {
8484 Diag(EnumLoc, diag::err_enum_redeclare_scoped_mismatch)
8485 << Prev->isScoped();
8486 Diag(Prev->getLocation(), diag::note_previous_use);
8487 return true;
8488 }
8489
8490 if (IsFixed && Prev->isFixed()) {
Richard Smith4ca93d92012-03-26 04:08:46 +00008491 if (!EnumUnderlyingTy->isDependentType() &&
8492 !Prev->getIntegerType()->isDependentType() &&
8493 !Context.hasSameUnqualifiedType(EnumUnderlyingTy,
Richard Smithf1c66b42012-03-14 23:13:10 +00008494 Prev->getIntegerType())) {
8495 Diag(EnumLoc, diag::err_enum_redeclare_type_mismatch)
8496 << EnumUnderlyingTy << Prev->getIntegerType();
8497 Diag(Prev->getLocation(), diag::note_previous_use);
8498 return true;
8499 }
8500 } else if (IsFixed != Prev->isFixed()) {
8501 Diag(EnumLoc, diag::err_enum_redeclare_fixed_mismatch)
8502 << Prev->isFixed();
8503 Diag(Prev->getLocation(), diag::note_previous_use);
8504 return true;
8505 }
8506
8507 return false;
8508}
8509
Joao Matos6666ed42012-08-31 18:45:21 +00008510/// \brief Get diagnostic %select index for tag kind for
8511/// redeclaration diagnostic message.
8512/// WARNING: Indexes apply to particular diagnostics only!
8513///
8514/// \returns diagnostic %select index.
Joao Matosf143ae92012-09-01 00:13:24 +00008515static unsigned getRedeclDiagFromTagKind(TagTypeKind Tag) {
Joao Matos6666ed42012-08-31 18:45:21 +00008516 switch (Tag) {
Joao Matosf143ae92012-09-01 00:13:24 +00008517 case TTK_Struct: return 0;
8518 case TTK_Interface: return 1;
8519 case TTK_Class: return 2;
8520 default: llvm_unreachable("Invalid tag kind for redecl diagnostic!");
Joao Matos6666ed42012-08-31 18:45:21 +00008521 }
Joao Matos6666ed42012-08-31 18:45:21 +00008522}
8523
8524/// \brief Determine if tag kind is a class-key compatible with
8525/// class for redeclaration (class, struct, or __interface).
8526///
Sylvestre Ledruf3477c12012-09-27 10:16:10 +00008527/// \returns true iff the tag kind is compatible.
Joao Matos6666ed42012-08-31 18:45:21 +00008528static bool isClassCompatTagKind(TagTypeKind Tag)
8529{
8530 return Tag == TTK_Struct || Tag == TTK_Class || Tag == TTK_Interface;
8531}
8532
Douglas Gregor501c5ce2009-05-14 16:41:31 +00008533/// \brief Determine whether a tag with a given kind is acceptable
8534/// as a redeclaration of the given tag declaration.
8535///
8536/// \returns true if the new tag kind is acceptable, false otherwise.
Mike Stump1eb44332009-09-09 15:08:12 +00008537bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous,
Richard Trieubbf34c02011-06-10 03:11:26 +00008538 TagTypeKind NewTag, bool isDefinition,
Douglas Gregor501c5ce2009-05-14 16:41:31 +00008539 SourceLocation NewTagLoc,
8540 const IdentifierInfo &Name) {
8541 // C++ [dcl.type.elab]p3:
8542 // The class-key or enum keyword present in the
8543 // elaborated-type-specifier shall agree in kind with the
Abramo Bagnara465d41b2010-05-11 21:36:43 +00008544 // declaration to which the name in the elaborated-type-specifier
Douglas Gregor501c5ce2009-05-14 16:41:31 +00008545 // refers. This rule also applies to the form of
8546 // elaborated-type-specifier that declares a class-name or
8547 // friend class since it can be construed as referring to the
8548 // definition of the class. Thus, in any
8549 // elaborated-type-specifier, the enum keyword shall be used to
Abramo Bagnara465d41b2010-05-11 21:36:43 +00008550 // refer to an enumeration (7.2), the union class-key shall be
Douglas Gregor501c5ce2009-05-14 16:41:31 +00008551 // used to refer to a union (clause 9), and either the class or
8552 // struct class-key shall be used to refer to a class (clause 9)
8553 // declared using the class or struct class-key.
Abramo Bagnara465d41b2010-05-11 21:36:43 +00008554 TagTypeKind OldTag = Previous->getTagKind();
Joao Matos6666ed42012-08-31 18:45:21 +00008555 if (!isDefinition || !isClassCompatTagKind(NewTag))
Richard Trieubbf34c02011-06-10 03:11:26 +00008556 if (OldTag == NewTag)
8557 return true;
Mike Stump1eb44332009-09-09 15:08:12 +00008558
Joao Matos6666ed42012-08-31 18:45:21 +00008559 if (isClassCompatTagKind(OldTag) && isClassCompatTagKind(NewTag)) {
Douglas Gregor501c5ce2009-05-14 16:41:31 +00008560 // Warn about the struct/class tag mismatch.
8561 bool isTemplate = false;
8562 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous))
8563 isTemplate = Record->getDescribedClassTemplate();
8564
Richard Trieubbf34c02011-06-10 03:11:26 +00008565 if (!ActiveTemplateInstantiations.empty()) {
8566 // In a template instantiation, do not offer fix-its for tag mismatches
8567 // since they usually mess up the template instead of fixing the problem.
8568 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch)
Joao Matos6666ed42012-08-31 18:45:21 +00008569 << getRedeclDiagFromTagKind(NewTag) << isTemplate << &Name
8570 << getRedeclDiagFromTagKind(OldTag);
Richard Trieubbf34c02011-06-10 03:11:26 +00008571 return true;
8572 }
8573
8574 if (isDefinition) {
8575 // On definitions, check previous tags and issue a fix-it for each
8576 // one that doesn't match the current tag.
8577 if (Previous->getDefinition()) {
8578 // Don't suggest fix-its for redefinitions.
8579 return true;
8580 }
8581
8582 bool previousMismatch = false;
8583 for (TagDecl::redecl_iterator I(Previous->redecls_begin()),
8584 E(Previous->redecls_end()); I != E; ++I) {
8585 if (I->getTagKind() != NewTag) {
8586 if (!previousMismatch) {
8587 previousMismatch = true;
8588 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch)
Joao Matos6666ed42012-08-31 18:45:21 +00008589 << getRedeclDiagFromTagKind(NewTag) << isTemplate << &Name
8590 << getRedeclDiagFromTagKind(I->getTagKind());
Richard Trieubbf34c02011-06-10 03:11:26 +00008591 }
8592 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion)
Joao Matos6666ed42012-08-31 18:45:21 +00008593 << getRedeclDiagFromTagKind(NewTag)
Richard Trieubbf34c02011-06-10 03:11:26 +00008594 << FixItHint::CreateReplacement(I->getInnerLocStart(),
Joao Matos6666ed42012-08-31 18:45:21 +00008595 TypeWithKeyword::getTagTypeKindName(NewTag));
Richard Trieubbf34c02011-06-10 03:11:26 +00008596 }
8597 }
8598 return true;
8599 }
8600
8601 // Check for a previous definition. If current tag and definition
8602 // are same type, do nothing. If no definition, but disagree with
8603 // with previous tag type, give a warning, but no fix-it.
8604 const TagDecl *Redecl = Previous->getDefinition() ?
8605 Previous->getDefinition() : Previous;
8606 if (Redecl->getTagKind() == NewTag) {
8607 return true;
8608 }
8609
Douglas Gregor501c5ce2009-05-14 16:41:31 +00008610 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch)
Joao Matos6666ed42012-08-31 18:45:21 +00008611 << getRedeclDiagFromTagKind(NewTag) << isTemplate << &Name
8612 << getRedeclDiagFromTagKind(OldTag);
Richard Trieubbf34c02011-06-10 03:11:26 +00008613 Diag(Redecl->getLocation(), diag::note_previous_use);
8614
8615 // If there is a previous defintion, suggest a fix-it.
8616 if (Previous->getDefinition()) {
8617 Diag(NewTagLoc, diag::note_struct_class_suggestion)
Joao Matos6666ed42012-08-31 18:45:21 +00008618 << getRedeclDiagFromTagKind(Redecl->getTagKind())
Richard Trieubbf34c02011-06-10 03:11:26 +00008619 << FixItHint::CreateReplacement(SourceRange(NewTagLoc),
Joao Matos6666ed42012-08-31 18:45:21 +00008620 TypeWithKeyword::getTagTypeKindName(Redecl->getTagKind()));
Richard Trieubbf34c02011-06-10 03:11:26 +00008621 }
8622
Douglas Gregor501c5ce2009-05-14 16:41:31 +00008623 return true;
8624 }
8625 return false;
8626}
8627
Steve Naroff08d92e42007-09-15 18:49:24 +00008628/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the
Reid Spencer5f016e22007-07-11 17:01:13 +00008629/// former case, Name will be non-null. In the later case, Name will be null.
John McCall0f434ec2009-07-31 02:45:11 +00008630/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a
Reid Spencer5f016e22007-07-11 17:01:13 +00008631/// reference/declaration/definition of a tag.
John McCalld226f652010-08-21 09:40:31 +00008632Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK,
Douglas Gregor069ea642010-09-16 23:58:57 +00008633 SourceLocation KWLoc, CXXScopeSpec &SS,
8634 IdentifierInfo *Name, SourceLocation NameLoc,
8635 AttributeList *Attr, AccessSpecifier AS,
Douglas Gregore7612302011-09-09 19:05:14 +00008636 SourceLocation ModulePrivateLoc,
Douglas Gregor069ea642010-09-16 23:58:57 +00008637 MultiTemplateParamsArg TemplateParameterLists,
Abramo Bagnaraa88cefd2010-12-03 18:54:17 +00008638 bool &OwnedDecl, bool &IsDependent,
Richard Smithbdad7a22012-01-10 01:33:14 +00008639 SourceLocation ScopedEnumKWLoc,
8640 bool ScopedEnumUsesClassTag,
Douglas Gregor1274ccd2010-10-08 23:50:27 +00008641 TypeResult UnderlyingType) {
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00008642 // If this is not a definition, it must have a name.
Douglas Gregor69605872012-03-28 16:01:27 +00008643 IdentifierInfo *OrigName = Name;
John McCall0f434ec2009-07-31 02:45:11 +00008644 assert((Name != 0 || TUK == TUK_Definition) &&
Reid Spencer5f016e22007-07-11 17:01:13 +00008645 "Nameless record must be a definition!");
John McCall9a34edb2010-10-19 01:40:49 +00008646 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference);
Douglas Gregoraaba5e32009-02-04 19:02:06 +00008647
Douglas Gregor402abb52009-05-28 23:31:59 +00008648 OwnedDecl = false;
Abramo Bagnara465d41b2010-05-11 21:36:43 +00008649 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
Richard Smithbdad7a22012-01-10 01:33:14 +00008650 bool ScopedEnum = ScopedEnumKWLoc.isValid();
Mike Stump1eb44332009-09-09 15:08:12 +00008651
Douglas Gregor1fef4e62009-10-07 22:35:40 +00008652 // FIXME: Check explicit specializations more carefully.
8653 bool isExplicitSpecialization = false;
Douglas Gregor0167f3c2010-07-14 23:14:12 +00008654 bool Invalid = false;
John McCall9a34edb2010-10-19 01:40:49 +00008655
8656 // We only need to do this matching if we have template parameters
8657 // or a scope specifier, which also conveniently avoids this work
8658 // for non-C++ cases.
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00008659 if (TemplateParameterLists.size() > 0 ||
John McCall9a34edb2010-10-19 01:40:49 +00008660 (SS.isNotEmpty() && TUK != TUK_Reference)) {
Douglas Gregor7cdbc582009-07-22 23:48:44 +00008661 if (TemplateParameterList *TemplateParams
Douglas Gregorc8406492011-05-10 18:27:06 +00008662 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS,
Benjamin Kramer5354e772012-08-23 23:38:35 +00008663 TemplateParameterLists.data(),
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00008664 TemplateParameterLists.size(),
John McCall77e8b112010-04-13 20:37:33 +00008665 TUK == TUK_Friend,
Douglas Gregor0167f3c2010-07-14 23:14:12 +00008666 isExplicitSpecialization,
8667 Invalid)) {
Douglas Gregord85bea22009-09-26 06:47:28 +00008668 if (TemplateParams->size() > 0) {
Douglas Gregor7cdbc582009-07-22 23:48:44 +00008669 // This is a declaration or definition of a class template (which may
8670 // be a member of another template).
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00008671
Douglas Gregor0167f3c2010-07-14 23:14:12 +00008672 if (Invalid)
John McCalld226f652010-08-21 09:40:31 +00008673 return 0;
Abramo Bagnarac57c17d2011-03-10 13:28:31 +00008674
Douglas Gregor7cdbc582009-07-22 23:48:44 +00008675 OwnedDecl = false;
John McCall0f434ec2009-07-31 02:45:11 +00008676 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc,
Douglas Gregor7cdbc582009-07-22 23:48:44 +00008677 SS, Name, NameLoc, Attr,
Abramo Bagnarac57c17d2011-03-10 13:28:31 +00008678 TemplateParams, AS,
Douglas Gregore7612302011-09-09 19:05:14 +00008679 ModulePrivateLoc,
Benjamin Kramer3fe198b2012-08-23 21:35:17 +00008680 TemplateParameterLists.size()-1,
Benjamin Kramer5354e772012-08-23 23:38:35 +00008681 TemplateParameterLists.data());
Douglas Gregor7cdbc582009-07-22 23:48:44 +00008682 return Result.get();
8683 } else {
Douglas Gregorf6b11852009-10-08 15:14:33 +00008684 // The "template<>" header is extraneous.
8685 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams)
Abramo Bagnara465d41b2010-05-11 21:36:43 +00008686 << TypeWithKeyword::getTagTypeKindName(Kind) << Name;
Douglas Gregorf6b11852009-10-08 15:14:33 +00008687 isExplicitSpecialization = true;
Douglas Gregor7cdbc582009-07-22 23:48:44 +00008688 }
Mike Stump1eb44332009-09-09 15:08:12 +00008689 }
8690 }
8691
Douglas Gregor1274ccd2010-10-08 23:50:27 +00008692 // Figure out the underlying type if this a enum declaration. We need to do
8693 // this early, because it's needed to detect if this is an incompatible
8694 // redeclaration.
8695 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying;
8696
8697 if (Kind == TTK_Enum) {
8698 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum))
8699 // No underlying type explicitly specified, or we failed to parse the
8700 // type, default to int.
8701 EnumUnderlying = Context.IntTy.getTypePtr();
8702 else if (UnderlyingType.get()) {
8703 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an
8704 // integral type; any cv-qualification is ignored.
8705 TypeSourceInfo *TI = 0;
Richard Smith878416d2012-03-15 00:22:18 +00008706 GetTypeFromParser(UnderlyingType.get(), &TI);
Douglas Gregor1274ccd2010-10-08 23:50:27 +00008707 EnumUnderlying = TI;
8708
Richard Smithf1c66b42012-03-14 23:13:10 +00008709 if (CheckEnumUnderlyingType(TI))
Douglas Gregor1274ccd2010-10-08 23:50:27 +00008710 // Recover by falling back to int.
8711 EnumUnderlying = Context.IntTy.getTypePtr();
Douglas Gregor0c9e4792010-12-16 00:24:44 +00008712
Richard Smithf1c66b42012-03-14 23:13:10 +00008713 if (DiagnoseUnexpandedParameterPack(TI->getTypeLoc().getBeginLoc(), TI,
Douglas Gregor0c9e4792010-12-16 00:24:44 +00008714 UPPC_FixedUnderlyingType))
8715 EnumUnderlying = Context.IntTy.getTypePtr();
8716
David Blaikie4e4d0842012-03-11 07:00:24 +00008717 } else if (getLangOpts().MicrosoftMode)
Francois Pichet842e7a22010-10-18 15:01:13 +00008718 // Microsoft enums are always of int type.
8719 EnumUnderlying = Context.IntTy.getTypePtr();
Douglas Gregor1274ccd2010-10-08 23:50:27 +00008720 }
8721
Douglas Gregor4920f1f2009-01-12 22:49:06 +00008722 DeclContext *SearchDC = CurContext;
Argyrios Kyrtzidis0f84a232008-11-09 22:53:32 +00008723 DeclContext *DC = CurContext;
Douglas Gregor7adb10f2009-09-15 22:30:29 +00008724 bool isStdBadAlloc = false;
Douglas Gregor0b7a1582009-01-17 00:42:38 +00008725
Chandler Carruth7bf36002010-03-01 21:17:36 +00008726 RedeclarationKind Redecl = ForRedeclaration;
8727 if (TUK == TUK_Friend || TUK == TUK_Reference)
8728 Redecl = NotForRedeclaration;
John McCall68263142009-11-18 22:49:29 +00008729
8730 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl);
John McCall6e247262009-10-10 05:48:19 +00008731
Argyrios Kyrtzidis630c81b2008-11-09 22:09:58 +00008732 if (Name && SS.isNotEmpty()) {
8733 // We have a nested-name tag ('struct foo::bar').
8734
8735 // Check for invalid 'foo::'.
Argyrios Kyrtzidis0f84a232008-11-09 22:53:32 +00008736 if (SS.isInvalid()) {
Argyrios Kyrtzidis630c81b2008-11-09 22:09:58 +00008737 Name = 0;
8738 goto CreateNewDecl;
8739 }
8740
John McCallc4e70192009-09-11 04:59:25 +00008741 // If this is a friend or a reference to a class in a dependent
8742 // context, don't try to make a decl for it.
8743 if (TUK == TUK_Friend || TUK == TUK_Reference) {
8744 DC = computeDeclContext(SS, false);
8745 if (!DC) {
8746 IsDependent = true;
John McCalld226f652010-08-21 09:40:31 +00008747 return 0;
John McCallc4e70192009-09-11 04:59:25 +00008748 }
John McCall77bb1aa2010-05-01 00:40:08 +00008749 } else {
8750 DC = computeDeclContext(SS, true);
8751 if (!DC) {
8752 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec)
8753 << SS.getRange();
John McCalld226f652010-08-21 09:40:31 +00008754 return 0;
John McCall77bb1aa2010-05-01 00:40:08 +00008755 }
John McCallc4e70192009-09-11 04:59:25 +00008756 }
8757
John McCall77bb1aa2010-05-01 00:40:08 +00008758 if (RequireCompleteDeclContext(SS, DC))
John McCalld226f652010-08-21 09:40:31 +00008759 return 0;
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00008760
Douglas Gregor1931b442009-02-03 00:34:39 +00008761 SearchDC = DC;
Argyrios Kyrtzidis0f84a232008-11-09 22:53:32 +00008762 // Look-up name inside 'foo::'.
John McCall68263142009-11-18 22:49:29 +00008763 LookupQualifiedName(Previous, DC);
John McCall6e247262009-10-10 05:48:19 +00008764
John McCall68263142009-11-18 22:49:29 +00008765 if (Previous.isAmbiguous())
John McCalld226f652010-08-21 09:40:31 +00008766 return 0;
John McCall6e247262009-10-10 05:48:19 +00008767
John McCall68263142009-11-18 22:49:29 +00008768 if (Previous.empty()) {
Douglas Gregor9edad9b2010-01-14 17:47:39 +00008769 // Name lookup did not find anything. However, if the
8770 // nested-name-specifier refers to the current instantiation,
8771 // and that current instantiation has any dependent base
8772 // classes, we might find something at instantiation time: treat
8773 // this as a dependent elaborated-type-specifier.
John McCall9a34edb2010-10-19 01:40:49 +00008774 // But this only makes any sense for reference-like lookups.
8775 if (Previous.wasNotFoundInCurrentInstantiation() &&
8776 (TUK == TUK_Reference || TUK == TUK_Friend)) {
Douglas Gregor9edad9b2010-01-14 17:47:39 +00008777 IsDependent = true;
John McCalld226f652010-08-21 09:40:31 +00008778 return 0;
Douglas Gregor9edad9b2010-01-14 17:47:39 +00008779 }
8780
8781 // A tag 'foo::bar' must already exist.
Douglas Gregor1eabb7d2010-03-31 23:17:41 +00008782 Diag(NameLoc, diag::err_not_tag_in_scope)
8783 << Kind << Name << DC << SS.getRange();
Argyrios Kyrtzidis630c81b2008-11-09 22:09:58 +00008784 Name = 0;
Douglas Gregord0c87372009-05-27 17:30:49 +00008785 Invalid = true;
Argyrios Kyrtzidis630c81b2008-11-09 22:09:58 +00008786 goto CreateNewDecl;
8787 }
Chris Lattnercf79b012009-01-21 02:38:50 +00008788 } else if (Name) {
Argyrios Kyrtzidis630c81b2008-11-09 22:09:58 +00008789 // If this is a named struct, check to see if there was a previous forward
8790 // declaration or definition.
Douglas Gregor2a3009a2009-02-03 19:21:40 +00008791 // FIXME: We're looking into outer scopes here, even when we
8792 // shouldn't be. Doing so can result in ambiguities that we
8793 // shouldn't be diagnosing.
John McCall68263142009-11-18 22:49:29 +00008794 LookupName(Previous, S);
8795
Douglas Gregor93b6bce2011-05-09 21:46:33 +00008796 if (Previous.isAmbiguous() &&
8797 (TUK == TUK_Definition || TUK == TUK_Declaration)) {
Douglas Gregor61c6c442011-05-04 00:25:33 +00008798 LookupResult::Filter F = Previous.makeFilter();
8799 while (F.hasNext()) {
8800 NamedDecl *ND = F.next();
8801 if (ND->getDeclContext()->getRedeclContext() != SearchDC)
8802 F.erase();
8803 }
8804 F.done();
Douglas Gregor61c6c442011-05-04 00:25:33 +00008805 }
8806
John McCall68263142009-11-18 22:49:29 +00008807 // Note: there used to be some attempt at recovery here.
8808 if (Previous.isAmbiguous())
John McCalld226f652010-08-21 09:40:31 +00008809 return 0;
Douglas Gregor72de6672009-01-08 20:45:30 +00008810
David Blaikie4e4d0842012-03-11 07:00:24 +00008811 if (!getLangOpts().CPlusPlus && TUK != TUK_Reference) {
Douglas Gregor72de6672009-01-08 20:45:30 +00008812 // FIXME: This makes sure that we ignore the contexts associated
8813 // with C structs, unions, and enums when looking for a matching
8814 // tag declaration or definition. See the similar lookup tweak
Douglas Gregor4c921ae2009-01-30 01:04:22 +00008815 // in Sema::LookupName; is there a better way to deal with this?
Douglas Gregor4920f1f2009-01-12 22:49:06 +00008816 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC))
8817 SearchDC = SearchDC->getParent();
Douglas Gregor72de6672009-01-08 20:45:30 +00008818 }
Douglas Gregor069ea642010-09-16 23:58:57 +00008819 } else if (S->isFunctionPrototypeScope()) {
8820 // If this is an enum declaration in function prototype scope, set its
8821 // initial context to the translation unit.
Nick Lewycky8d176812012-03-10 07:45:33 +00008822 // FIXME: [citation needed]
Douglas Gregor069ea642010-09-16 23:58:57 +00008823 SearchDC = Context.getTranslationUnitDecl();
Argyrios Kyrtzidis630c81b2008-11-09 22:09:58 +00008824 }
8825
John McCall68263142009-11-18 22:49:29 +00008826 if (Previous.isSingleResult() &&
8827 Previous.getFoundDecl()->isTemplateParameter()) {
Douglas Gregor72c3f312008-12-05 18:15:24 +00008828 // Maybe we will complain about the shadowed template parameter.
John McCall68263142009-11-18 22:49:29 +00008829 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl());
Douglas Gregor72c3f312008-12-05 18:15:24 +00008830 // Just pretend that we didn't see the previous declaration.
John McCall68263142009-11-18 22:49:29 +00008831 Previous.clear();
Douglas Gregor72c3f312008-12-05 18:15:24 +00008832 }
8833
David Blaikie4e4d0842012-03-11 07:00:24 +00008834 if (getLangOpts().CPlusPlus && Name && DC && StdNamespace &&
Argyrios Kyrtzidis76c38d32010-08-02 07:14:54 +00008835 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) {
Douglas Gregor7adb10f2009-09-15 22:30:29 +00008836 // This is a declaration of or a reference to "std::bad_alloc".
8837 isStdBadAlloc = true;
8838
John McCall68263142009-11-18 22:49:29 +00008839 if (Previous.empty() && StdBadAlloc) {
Douglas Gregor7adb10f2009-09-15 22:30:29 +00008840 // std::bad_alloc has been implicitly declared (but made invisible to
8841 // name lookup). Fill in this implicit declaration as the previous
8842 // declaration, so that the declarations get chained appropriately.
Argyrios Kyrtzidis76c38d32010-08-02 07:14:54 +00008843 Previous.addDecl(getStdBadAlloc());
Douglas Gregor7adb10f2009-09-15 22:30:29 +00008844 }
8845 }
John McCall68263142009-11-18 22:49:29 +00008846
John McCall9c86b512010-03-25 21:28:06 +00008847 // If we didn't find a previous declaration, and this is a reference
8848 // (or friend reference), move to the correct scope. In C++, we
8849 // also need to do a redeclaration lookup there, just in case
8850 // there's a shadow friend decl.
8851 if (Name && Previous.empty() &&
8852 (TUK == TUK_Reference || TUK == TUK_Friend)) {
8853 if (Invalid) goto CreateNewDecl;
8854 assert(SS.isEmpty());
8855
8856 if (TUK == TUK_Reference) {
8857 // C++ [basic.scope.pdecl]p5:
8858 // -- for an elaborated-type-specifier of the form
8859 //
8860 // class-key identifier
8861 //
8862 // if the elaborated-type-specifier is used in the
8863 // decl-specifier-seq or parameter-declaration-clause of a
8864 // function defined in namespace scope, the identifier is
8865 // declared as a class-name in the namespace that contains
8866 // the declaration; otherwise, except as a friend
8867 // declaration, the identifier is declared in the smallest
8868 // non-class, non-function-prototype scope that contains the
8869 // declaration.
8870 //
8871 // C99 6.7.2.3p8 has a similar (but not identical!) provision for
8872 // C structs and unions.
8873 //
8874 // It is an error in C++ to declare (rather than define) an enum
8875 // type, including via an elaborated type specifier. We'll
8876 // diagnose that later; for now, declare the enum in the same
8877 // scope as we would have picked for any other tag type.
8878 //
8879 // GNU C also supports this behavior as part of its incomplete
8880 // enum types extension, while GNU C++ does not.
8881 //
8882 // Find the context where we'll be declaring the tag.
8883 // FIXME: We would like to maintain the current DeclContext as the
8884 // lexical context,
Nick Lewycky1659c372012-03-10 07:47:07 +00008885 while (!SearchDC->isFileContext() && !SearchDC->isFunctionOrMethod())
John McCall9c86b512010-03-25 21:28:06 +00008886 SearchDC = SearchDC->getParent();
8887
8888 // Find the scope where we'll be declaring the tag.
8889 while (S->isClassScope() ||
David Blaikie4e4d0842012-03-11 07:00:24 +00008890 (getLangOpts().CPlusPlus &&
John McCall9c86b512010-03-25 21:28:06 +00008891 S->isFunctionPrototypeScope()) ||
8892 ((S->getFlags() & Scope::DeclScope) == 0) ||
8893 (S->getEntity() &&
8894 ((DeclContext *)S->getEntity())->isTransparentContext()))
8895 S = S->getParent();
8896 } else {
8897 assert(TUK == TUK_Friend);
8898 // C++ [namespace.memdef]p3:
8899 // If a friend declaration in a non-local class first declares a
8900 // class or function, the friend class or function is a member of
8901 // the innermost enclosing namespace.
8902 SearchDC = SearchDC->getEnclosingNamespaceContext();
John McCall9c86b512010-03-25 21:28:06 +00008903 }
8904
John McCall0d6b1642010-04-23 18:46:30 +00008905 // In C++, we need to do a redeclaration lookup to properly
8906 // diagnose some problems.
David Blaikie4e4d0842012-03-11 07:00:24 +00008907 if (getLangOpts().CPlusPlus) {
John McCall9c86b512010-03-25 21:28:06 +00008908 Previous.setRedeclarationKind(ForRedeclaration);
8909 LookupQualifiedName(Previous, SearchDC);
8910 }
8911 }
8912
John McCall68263142009-11-18 22:49:29 +00008913 if (!Previous.empty()) {
Douglas Gregor57265e32010-04-12 16:00:01 +00008914 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl();
John McCall0d6b1642010-04-23 18:46:30 +00008915
8916 // It's okay to have a tag decl in the same scope as a typedef
8917 // which hides a tag decl in the same scope. Finding this
8918 // insanity with a redeclaration lookup can only actually happen
8919 // in C++.
8920 //
8921 // This is also okay for elaborated-type-specifiers, which is
8922 // technically forbidden by the current standard but which is
8923 // okay according to the likely resolution of an open issue;
8924 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407
David Blaikie4e4d0842012-03-11 07:00:24 +00008925 if (getLangOpts().CPlusPlus) {
Richard Smith162e1c12011-04-15 14:24:37 +00008926 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) {
John McCall0d6b1642010-04-23 18:46:30 +00008927 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) {
8928 TagDecl *Tag = TT->getDecl();
8929 if (Tag->getDeclName() == Name &&
Sebastian Redl7a126a42010-08-31 00:36:30 +00008930 Tag->getDeclContext()->getRedeclContext()
8931 ->Equals(TD->getDeclContext()->getRedeclContext())) {
John McCall0d6b1642010-04-23 18:46:30 +00008932 PrevDecl = Tag;
8933 Previous.clear();
8934 Previous.addDecl(Tag);
Douglas Gregor757c6002010-08-27 22:55:10 +00008935 Previous.resolveKind();
John McCall0d6b1642010-04-23 18:46:30 +00008936 }
8937 }
8938 }
8939 }
8940
Argyrios Kyrtzidis2d1c5d32008-04-27 13:50:30 +00008941 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) {
Chris Lattner14943b92008-07-03 03:30:58 +00008942 // If this is a use of a previous tag, or if the tag is already declared
8943 // in the same scope (so that the definition/declaration completes or
Argyrios Kyrtzidis2d1c5d32008-04-27 13:50:30 +00008944 // rementions the tag), reuse the decl.
John McCall67d1a672009-08-06 02:15:43 +00008945 if (TUK == TUK_Reference || TUK == TUK_Friend ||
Douglas Gregorcc209452011-03-07 16:54:27 +00008946 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) {
Chris Lattner14943b92008-07-03 03:30:58 +00008947 // Make sure that this wasn't declared as an enum and now used as a
8948 // struct or something similar.
Richard Trieubbf34c02011-06-10 03:11:26 +00008949 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind,
8950 TUK == TUK_Definition, KWLoc,
8951 *Name)) {
Mike Stump1eb44332009-09-09 15:08:12 +00008952 bool SafeToContinue
Abramo Bagnara465d41b2010-05-11 21:36:43 +00008953 = (PrevTagDecl->getTagKind() != TTK_Enum &&
8954 Kind != TTK_Enum);
Douglas Gregora3a83512009-04-01 23:51:29 +00008955 if (SafeToContinue)
Mike Stump1eb44332009-09-09 15:08:12 +00008956 Diag(KWLoc, diag::err_use_with_wrong_tag)
Douglas Gregora3a83512009-04-01 23:51:29 +00008957 << Name
Douglas Gregor849b2432010-03-31 17:46:05 +00008958 << FixItHint::CreateReplacement(SourceRange(KWLoc),
8959 PrevTagDecl->getKindName());
Douglas Gregora3a83512009-04-01 23:51:29 +00008960 else
8961 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name;
John McCall68263142009-11-18 22:49:29 +00008962 Diag(PrevTagDecl->getLocation(), diag::note_previous_use);
Douglas Gregora3a83512009-04-01 23:51:29 +00008963
Mike Stump1eb44332009-09-09 15:08:12 +00008964 if (SafeToContinue)
Douglas Gregora3a83512009-04-01 23:51:29 +00008965 Kind = PrevTagDecl->getTagKind();
8966 else {
8967 // Recover by making this an anonymous redefinition.
8968 Name = 0;
John McCall68263142009-11-18 22:49:29 +00008969 Previous.clear();
Douglas Gregora3a83512009-04-01 23:51:29 +00008970 Invalid = true;
8971 }
8972 }
8973
Douglas Gregor1274ccd2010-10-08 23:50:27 +00008974 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) {
8975 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl);
8976
Richard Smithbdad7a22012-01-10 01:33:14 +00008977 // If this is an elaborated-type-specifier for a scoped enumeration,
8978 // the 'class' keyword is not necessary and not permitted.
8979 if (TUK == TUK_Reference || TUK == TUK_Friend) {
8980 if (ScopedEnum)
8981 Diag(ScopedEnumKWLoc, diag::err_enum_class_reference)
8982 << PrevEnum->isScoped()
8983 << FixItHint::CreateRemoval(ScopedEnumKWLoc);
8984 return PrevTagDecl;
8985 }
8986
Richard Smithf1c66b42012-03-14 23:13:10 +00008987 QualType EnumUnderlyingTy;
8988 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>())
8989 EnumUnderlyingTy = TI->getType();
8990 else if (const Type *T = EnumUnderlying.dyn_cast<const Type*>())
8991 EnumUnderlyingTy = QualType(T, 0);
8992
Douglas Gregor1274ccd2010-10-08 23:50:27 +00008993 // All conflicts with previous declarations are recovered by
Richard Smith3343fad2012-03-23 23:09:08 +00008994 // returning the previous declaration, unless this is a definition,
8995 // in which case we want the caller to bail out.
Richard Smithf1c66b42012-03-14 23:13:10 +00008996 if (CheckEnumRedeclaration(NameLoc.isValid() ? NameLoc : KWLoc,
8997 ScopedEnum, EnumUnderlyingTy, PrevEnum))
Richard Smith3343fad2012-03-23 23:09:08 +00008998 return TUK == TUK_Declaration ? PrevTagDecl : 0;
Douglas Gregor1274ccd2010-10-08 23:50:27 +00008999 }
9000
Douglas Gregora3a83512009-04-01 23:51:29 +00009001 if (!Invalid) {
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00009002 // If this is a use, just return the declaration we found.
Chris Lattner14943b92008-07-03 03:30:58 +00009003
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00009004 // FIXME: In the future, return a variant or some other clue
9005 // for the consumer of this Decl to know it doesn't own it.
9006 // For our current ASTs this shouldn't be a problem, but will
9007 // need to be changed with DeclGroups.
Francois Pichetb4746032011-06-01 04:14:20 +00009008 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() ||
David Blaikie4e4d0842012-03-11 07:00:24 +00009009 getLangOpts().MicrosoftExt)) || TUK == TUK_Friend)
John McCalld226f652010-08-21 09:40:31 +00009010 return PrevTagDecl;
Douglas Gregoraaba5e32009-02-04 19:02:06 +00009011
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00009012 // Diagnose attempts to redefine a tag.
John McCall0f434ec2009-07-31 02:45:11 +00009013 if (TUK == TUK_Definition) {
Douglas Gregor952b0172010-02-11 01:04:33 +00009014 if (TagDecl *Def = PrevTagDecl->getDefinition()) {
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00009015 // If we're defining a specialization and the previous definition
9016 // is from an implicit instantiation, don't emit an error
9017 // here; we'll catch this in the general case below.
Richard Smith1af83c42012-03-23 03:33:32 +00009018 bool IsExplicitSpecializationAfterInstantiation = false;
9019 if (isExplicitSpecialization) {
9020 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Def))
9021 IsExplicitSpecializationAfterInstantiation =
9022 RD->getTemplateSpecializationKind() !=
9023 TSK_ExplicitSpecialization;
9024 else if (EnumDecl *ED = dyn_cast<EnumDecl>(Def))
9025 IsExplicitSpecializationAfterInstantiation =
9026 ED->getTemplateSpecializationKind() !=
9027 TSK_ExplicitSpecialization;
9028 }
9029
9030 if (!IsExplicitSpecializationAfterInstantiation) {
James Molloy16f1f712012-02-29 10:24:19 +00009031 // A redeclaration in function prototype scope in C isn't
9032 // visible elsewhere, so merely issue a warning.
David Blaikie4e4d0842012-03-11 07:00:24 +00009033 if (!getLangOpts().CPlusPlus && S->containedInPrototypeScope())
James Molloy16f1f712012-02-29 10:24:19 +00009034 Diag(NameLoc, diag::warn_redefinition_in_param_list) << Name;
9035 else
9036 Diag(NameLoc, diag::err_redefinition) << Name;
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00009037 Diag(Def->getLocation(), diag::note_previous_definition);
9038 // If this is a redefinition, recover by making this
9039 // struct be anonymous, which will make any later
9040 // references get the previous definition.
9041 Name = 0;
John McCall68263142009-11-18 22:49:29 +00009042 Previous.clear();
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00009043 Invalid = true;
9044 }
Douglas Gregor0b7a1582009-01-17 00:42:38 +00009045 } else {
9046 // If the type is currently being defined, complain
9047 // about a nested redefinition.
John McCallf4c73712011-01-19 06:33:43 +00009048 const TagType *Tag
9049 = cast<TagType>(Context.getTagDeclType(PrevTagDecl));
Douglas Gregor0b7a1582009-01-17 00:42:38 +00009050 if (Tag->isBeingDefined()) {
9051 Diag(NameLoc, diag::err_nested_redefinition) << Name;
Mike Stump1eb44332009-09-09 15:08:12 +00009052 Diag(PrevTagDecl->getLocation(),
Douglas Gregor0b7a1582009-01-17 00:42:38 +00009053 diag::note_previous_definition);
9054 Name = 0;
John McCall68263142009-11-18 22:49:29 +00009055 Previous.clear();
Douglas Gregor0b7a1582009-01-17 00:42:38 +00009056 Invalid = true;
9057 }
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00009058 }
Douglas Gregor0b7a1582009-01-17 00:42:38 +00009059
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00009060 // Okay, this is definition of a previously declared or referenced
9061 // tag PrevDecl. We're going to create a new Decl for it.
Douglas Gregor0b7a1582009-01-17 00:42:38 +00009062 }
Argyrios Kyrtzidis2d1c5d32008-04-27 13:50:30 +00009063 }
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00009064 // If we get here we have (another) forward declaration or we
John McCall67d1a672009-08-06 02:15:43 +00009065 // have a definition. Just create a new decl.
9066
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00009067 } else {
9068 // If we get here, this is a definition of a new tag type in a nested
Mike Stump1eb44332009-09-09 15:08:12 +00009069 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00009070 // new decl/type. We set PrevDecl to NULL so that the entities
9071 // have distinct types.
John McCall68263142009-11-18 22:49:29 +00009072 Previous.clear();
Reid Spencer5f016e22007-07-11 17:01:13 +00009073 }
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00009074 // If we get here, we're going to create a new Decl. If PrevDecl
9075 // is non-NULL, it's a definition of the tag declared by
9076 // PrevDecl. If it's NULL, we have a new definition.
John McCall0d6b1642010-04-23 18:46:30 +00009077
9078
9079 // Otherwise, PrevDecl is not a tag, but was found with tag
9080 // lookup. This is only actually possible in C++, where a few
9081 // things like templates still live in the tag namespace.
Argyrios Kyrtzidis2d1c5d32008-04-27 13:50:30 +00009082 } else {
John McCall0d6b1642010-04-23 18:46:30 +00009083 // Use a better diagnostic if an elaborated-type-specifier
9084 // found the wrong kind of type on the first
9085 // (non-redeclaration) lookup.
9086 if ((TUK == TUK_Reference || TUK == TUK_Friend) &&
9087 !Previous.isForRedeclaration()) {
9088 unsigned Kind = 0;
9089 if (isa<TypedefDecl>(PrevDecl)) Kind = 1;
Richard Smith162e1c12011-04-15 14:24:37 +00009090 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2;
9091 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3;
John McCall0d6b1642010-04-23 18:46:30 +00009092 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind;
9093 Diag(PrevDecl->getLocation(), diag::note_declared_at);
9094 Invalid = true;
9095
9096 // Otherwise, only diagnose if the declaration is in scope.
Douglas Gregorcc209452011-03-07 16:54:27 +00009097 } else if (!isDeclInScope(PrevDecl, SearchDC, S,
9098 isExplicitSpecialization)) {
John McCall0d6b1642010-04-23 18:46:30 +00009099 // do nothing
9100
9101 // Diagnose implicit declarations introduced by elaborated types.
9102 } else if (TUK == TUK_Reference || TUK == TUK_Friend) {
9103 unsigned Kind = 0;
9104 if (isa<TypedefDecl>(PrevDecl)) Kind = 1;
Richard Smith162e1c12011-04-15 14:24:37 +00009105 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2;
9106 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3;
John McCall0d6b1642010-04-23 18:46:30 +00009107 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind;
9108 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl;
9109 Invalid = true;
9110
9111 // Otherwise it's a declaration. Call out a particularly common
9112 // case here.
Richard Smith162e1c12011-04-15 14:24:37 +00009113 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) {
9114 unsigned Kind = 0;
9115 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1;
John McCall0d6b1642010-04-23 18:46:30 +00009116 Diag(NameLoc, diag::err_tag_definition_of_typedef)
Richard Smith162e1c12011-04-15 14:24:37 +00009117 << Name << Kind << TND->getUnderlyingType();
John McCall0d6b1642010-04-23 18:46:30 +00009118 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl;
9119 Invalid = true;
9120
9121 // Otherwise, diagnose.
9122 } else {
9123 // The tag name clashes with something else in the target scope,
9124 // issue an error and recover by making this tag be anonymous.
Chris Lattner3c73c412008-11-19 08:23:25 +00009125 Diag(NameLoc, diag::err_redefinition_different_kind) << Name;
Chris Lattner5f4a6822008-11-23 23:12:31 +00009126 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
Argyrios Kyrtzidisb02ef242008-07-16 07:45:46 +00009127 Name = 0;
Douglas Gregor0b7a1582009-01-17 00:42:38 +00009128 Invalid = true;
Argyrios Kyrtzidisb02ef242008-07-16 07:45:46 +00009129 }
John McCall0d6b1642010-04-23 18:46:30 +00009130
9131 // The existing declaration isn't relevant to us; we're in a
9132 // new scope, so clear out the previous declaration.
9133 Previous.clear();
Reid Spencer5f016e22007-07-11 17:01:13 +00009134 }
Reid Spencer5f016e22007-07-11 17:01:13 +00009135 }
Argyrios Kyrtzidisef6e6472008-11-08 17:17:31 +00009136
Chris Lattnercc98eac2008-12-17 07:13:27 +00009137CreateNewDecl:
Mike Stump1eb44332009-09-09 15:08:12 +00009138
John McCall68263142009-11-18 22:49:29 +00009139 TagDecl *PrevDecl = 0;
9140 if (Previous.isSingleResult())
9141 PrevDecl = cast<TagDecl>(Previous.getFoundDecl());
9142
Reid Spencer5f016e22007-07-11 17:01:13 +00009143 // If there is an identifier, use the location of the identifier as the
9144 // location of the decl, otherwise use the location of the struct/union
9145 // keyword.
9146 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc;
Mike Stump1eb44332009-09-09 15:08:12 +00009147
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00009148 // Otherwise, create a new declaration. If there is a previous
9149 // declaration of the same entity, the two will be linked via
9150 // PrevDecl.
Reid Spencer5f016e22007-07-11 17:01:13 +00009151 TagDecl *New;
Douglas Gregorbcbffc42009-01-07 00:43:41 +00009152
Douglas Gregor1274ccd2010-10-08 23:50:27 +00009153 bool IsForwardReference = false;
Abramo Bagnara465d41b2010-05-11 21:36:43 +00009154 if (Kind == TTK_Enum) {
Reid Spencer5f016e22007-07-11 17:01:13 +00009155 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.:
9156 // enum X { A, B, C } D; D should chain to X.
Abramo Bagnaraba877ad2011-03-09 14:09:51 +00009157 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name,
Douglas Gregor1274ccd2010-10-08 23:50:27 +00009158 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum,
Abramo Bagnaraa88cefd2010-12-03 18:54:17 +00009159 ScopedEnumUsesClassTag, !EnumUnderlying.isNull());
Reid Spencer5f016e22007-07-11 17:01:13 +00009160 // If this is an undefined enum, warn.
Douglas Gregorf3a7b7c2010-06-22 14:26:35 +00009161 if (TUK != TUK_Definition && !Invalid) {
9162 TagDecl *Def;
David Blaikie4e4d0842012-03-11 07:00:24 +00009163 if (getLangOpts().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) {
Douglas Gregor1274ccd2010-10-08 23:50:27 +00009164 // C++0x: 7.2p2: opaque-enum-declaration.
9165 // Conflicts are diagnosed above. Do nothing.
9166 }
9167 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) {
Douglas Gregorf3a7b7c2010-06-22 14:26:35 +00009168 Diag(Loc, diag::ext_forward_ref_enum_def)
9169 << New;
9170 Diag(Def->getLocation(), diag::note_previous_definition);
9171 } else {
Francois Pichet8dc3abc2010-09-12 05:06:55 +00009172 unsigned DiagID = diag::ext_forward_ref_enum;
David Blaikie4e4d0842012-03-11 07:00:24 +00009173 if (getLangOpts().MicrosoftMode)
Francois Pichet8dc3abc2010-09-12 05:06:55 +00009174 DiagID = diag::ext_ms_forward_ref_enum;
David Blaikie4e4d0842012-03-11 07:00:24 +00009175 else if (getLangOpts().CPlusPlus)
Francois Pichet8dc3abc2010-09-12 05:06:55 +00009176 DiagID = diag::err_forward_ref_enum;
9177 Diag(Loc, DiagID);
Douglas Gregor1274ccd2010-10-08 23:50:27 +00009178
9179 // If this is a forward-declared reference to an enumeration, make a
9180 // note of it; we won't actually be introducing the declaration into
9181 // the declaration context.
9182 if (TUK == TUK_Reference)
9183 IsForwardReference = true;
Douglas Gregorf3a7b7c2010-06-22 14:26:35 +00009184 }
Douglas Gregor80711a22009-03-06 18:34:03 +00009185 }
Douglas Gregor1274ccd2010-10-08 23:50:27 +00009186
9187 if (EnumUnderlying) {
9188 EnumDecl *ED = cast<EnumDecl>(New);
9189 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>())
9190 ED->setIntegerTypeSourceInfo(TI);
9191 else
9192 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0));
9193 ED->setPromotionType(ED->getIntegerType());
9194 }
9195
Argyrios Kyrtzidis39ba4ae2008-06-09 23:19:58 +00009196 } else {
9197 // struct/union/class
9198
Reid Spencer5f016e22007-07-11 17:01:13 +00009199 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.:
9200 // struct X { int A; } D; D should chain to X.
David Blaikie4e4d0842012-03-11 07:00:24 +00009201 if (getLangOpts().CPlusPlus) {
Ted Kremenek2b345eb2008-09-05 17:39:33 +00009202 // FIXME: Look for a way to use RecordDecl for simple structs.
Abramo Bagnaraba877ad2011-03-09 14:09:51 +00009203 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name,
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00009204 cast_or_null<CXXRecordDecl>(PrevDecl));
Abramo Bagnaraba877ad2011-03-09 14:09:51 +00009205
Argyrios Kyrtzidis76c38d32010-08-02 07:14:54 +00009206 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit()))
Douglas Gregor7adb10f2009-09-15 22:30:29 +00009207 StdBadAlloc = cast<CXXRecordDecl>(New);
9208 } else
Abramo Bagnaraba877ad2011-03-09 14:09:51 +00009209 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name,
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00009210 cast_or_null<RecordDecl>(PrevDecl));
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +00009211 }
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00009212
John McCallb6217662010-03-15 10:12:16 +00009213 // Maybe add qualifier info.
9214 if (SS.isNotEmpty()) {
Fariborz Jahanian4fb20532010-05-14 21:35:02 +00009215 if (SS.isSet()) {
Douglas Gregor69605872012-03-28 16:01:27 +00009216 // If this is either a declaration or a definition, check the
9217 // nested-name-specifier against the current context. We don't do this
9218 // for explicit specializations, because they have similar checking
9219 // (with more specific diagnostics) in the call to
9220 // CheckMemberSpecialization, below.
9221 if (!isExplicitSpecialization &&
9222 (TUK == TUK_Definition || TUK == TUK_Declaration) &&
9223 diagnoseQualifiedDeclaration(SS, DC, OrigName, NameLoc))
9224 Invalid = true;
9225
Douglas Gregorc22b5ff2011-02-25 02:25:35 +00009226 New->setQualifierInfo(SS.getWithLocInContext(Context));
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00009227 if (TemplateParameterLists.size() > 0) {
Douglas Gregorc722ea42010-06-15 17:44:38 +00009228 New->setTemplateParameterListsInfo(Context,
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00009229 TemplateParameterLists.size(),
Benjamin Kramer5354e772012-08-23 23:38:35 +00009230 TemplateParameterLists.data());
Abramo Bagnara9b934882010-06-12 08:15:14 +00009231 }
Fariborz Jahanian4fb20532010-05-14 21:35:02 +00009232 }
9233 else
9234 Invalid = true;
John McCallb6217662010-03-15 10:12:16 +00009235 }
9236
Daniel Dunbar9f21f892010-05-27 01:53:40 +00009237 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) {
9238 // Add alignment attributes if necessary; these attributes are checked when
9239 // the ASTContext lays out the structure.
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00009240 //
9241 // It is important for implementing the correct semantics that this
9242 // happen here (in act on tag decl). The #pragma pack stack is
9243 // maintained as a result of parser callbacks which can occur at
9244 // many points during the parsing of a struct declaration (because
9245 // the #pragma tokens are effectively skipped over during the
9246 // parsing of the struct).
Eli Friedman2016c8c2012-08-08 21:08:34 +00009247 if (TUK == TUK_Definition) {
9248 AddAlignmentAttributesForRecord(RD);
9249 AddMsStructLayoutForRecord(RD);
9250 }
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00009251 }
9252
Douglas Gregor2ccd89c2011-12-20 18:11:52 +00009253 if (ModulePrivateLoc.isValid()) {
Douglas Gregord023aec2011-09-09 20:53:38 +00009254 if (isExplicitSpecialization)
9255 Diag(New->getLocation(), diag::err_module_private_specialization)
9256 << 2
9257 << FixItHint::CreateRemoval(ModulePrivateLoc);
Douglas Gregore3895852011-09-12 18:37:38 +00009258 // __module_private__ does not apply to local classes. However, we only
9259 // diagnose this as an error when the declaration specifiers are
9260 // freestanding. Here, we just ignore the __module_private__.
Douglas Gregore3895852011-09-12 18:37:38 +00009261 else if (!SearchDC->isFunctionOrMethod())
Douglas Gregore7612302011-09-09 19:05:14 +00009262 New->setModulePrivate();
9263 }
9264
Douglas Gregorf6b11852009-10-08 15:14:33 +00009265 // If this is a specialization of a member class (of a class template),
9266 // check the specialization.
John McCall68263142009-11-18 22:49:29 +00009267 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous))
Douglas Gregorf6b11852009-10-08 15:14:33 +00009268 Invalid = true;
Douglas Gregor69605872012-03-28 16:01:27 +00009269
Douglas Gregor0b7a1582009-01-17 00:42:38 +00009270 if (Invalid)
9271 New->setInvalidDecl();
9272
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00009273 if (Attr)
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00009274 ProcessDeclAttributeList(S, New, Attr);
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00009275
Douglas Gregor0b7a1582009-01-17 00:42:38 +00009276 // If we're declaring or defining a tag in function prototype scope
9277 // in C, note that this type can only be used within the function.
David Blaikie4e4d0842012-03-11 07:00:24 +00009278 if (Name && S->isFunctionPrototypeScope() && !getLangOpts().CPlusPlus)
Douglas Gregor3218c4b2009-01-09 22:42:13 +00009279 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New);
9280
Douglas Gregor7df7b6b2008-12-15 16:32:14 +00009281 // Set the lexical context. If the tag has a C++ scope specifier, the
9282 // lexical context will be different from the semantic context.
Douglas Gregor1931b442009-02-03 00:34:39 +00009283 New->setLexicalDeclContext(CurContext);
Douglas Gregor0b7a1582009-01-17 00:42:38 +00009284
John McCall02cace72009-08-28 07:59:38 +00009285 // Mark this as a friend decl if applicable.
Francois Pichetb4746032011-06-01 04:14:20 +00009286 // In Microsoft mode, a friend declaration also acts as a forward
9287 // declaration so we always pass true to setObjectOfFriendDecl to make
9288 // the tag name visible.
John McCall02cace72009-08-28 07:59:38 +00009289 if (TUK == TUK_Friend)
Francois Pichetb4746032011-06-01 04:14:20 +00009290 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() ||
David Blaikie4e4d0842012-03-11 07:00:24 +00009291 getLangOpts().MicrosoftExt);
John McCall02cace72009-08-28 07:59:38 +00009292
Anders Carlsson0cf88302009-03-26 01:19:02 +00009293 // Set the access specifier.
John McCall9c86b512010-03-25 21:28:06 +00009294 if (!Invalid && SearchDC->isRecord())
Douglas Gregord0c87372009-05-27 17:30:49 +00009295 SetMemberAccessSpecifier(New, PrevDecl, AS);
Douglas Gregor06c0fec2009-03-25 22:00:53 +00009296
John McCall0f434ec2009-07-31 02:45:11 +00009297 if (TUK == TUK_Definition)
Douglas Gregor0b7a1582009-01-17 00:42:38 +00009298 New->startDefinition();
Mike Stump1eb44332009-09-09 15:08:12 +00009299
Reid Spencer5f016e22007-07-11 17:01:13 +00009300 // If this has an identifier, add it to the scope stack.
John McCalld7eff682009-09-02 00:55:30 +00009301 if (TUK == TUK_Friend) {
John McCall82b9fb82009-09-02 19:32:14 +00009302 // We might be replacing an existing declaration in the lookup tables;
9303 // if so, borrow its access specifier.
9304 if (PrevDecl)
9305 New->setAccess(PrevDecl->getAccess());
9306
Sebastian Redl7a126a42010-08-31 00:36:30 +00009307 DeclContext *DC = New->getDeclContext()->getRedeclContext();
Richard Smith1b7f9cb2012-03-13 03:12:56 +00009308 DC->makeDeclVisibleInContext(New);
John McCall9c86b512010-03-25 21:28:06 +00009309 if (Name) // can be null along some error paths
John McCalld7eff682009-09-02 00:55:30 +00009310 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
9311 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false);
John McCalld7eff682009-09-02 00:55:30 +00009312 } else if (Name) {
Douglas Gregor1a0d31a2009-01-12 18:45:55 +00009313 S = getNonFieldDeclScope(S);
Douglas Gregor1274ccd2010-10-08 23:50:27 +00009314 PushOnScopeChains(New, S, !IsForwardReference);
9315 if (IsForwardReference)
Richard Smith1b7f9cb2012-03-13 03:12:56 +00009316 SearchDC->makeDeclVisibleInContext(New);
Douglas Gregor1274ccd2010-10-08 23:50:27 +00009317
Douglas Gregor4920f1f2009-01-12 22:49:06 +00009318 } else {
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00009319 CurContext->addDecl(New);
Reid Spencer5f016e22007-07-11 17:01:13 +00009320 }
Argyrios Kyrtzidis52393042008-11-09 23:41:00 +00009321
Douglas Gregorc29f77b2009-07-07 16:35:42 +00009322 // If this is the C FILE type, notify the AST context.
9323 if (IdentifierInfo *II = New->getIdentifier())
9324 if (!New->isInvalidDecl() &&
Sebastian Redl7a126a42010-08-31 00:36:30 +00009325 New->getDeclContext()->getRedeclContext()->isTranslationUnit() &&
Douglas Gregorc29f77b2009-07-07 16:35:42 +00009326 II->isStr("FILE"))
9327 Context.setFILEDecl(New);
Mike Stump1eb44332009-09-09 15:08:12 +00009328
James Molloy16f1f712012-02-29 10:24:19 +00009329 // If we were in function prototype scope (and not in C++ mode), add this
9330 // tag to the list of decls to inject into the function definition scope.
David Blaikie4e4d0842012-03-11 07:00:24 +00009331 if (S->isFunctionPrototypeScope() && !getLangOpts().CPlusPlus &&
James Molloy16f1f712012-02-29 10:24:19 +00009332 InFunctionDeclarator && Name)
9333 DeclsInPrototypeScope.push_back(New);
9334
Rafael Espindola98ae8342012-05-10 02:50:16 +00009335 if (PrevDecl)
9336 mergeDeclAttributes(New, PrevDecl);
9337
Rafael Espindola71adc5b2012-07-17 15:14:47 +00009338 // If there's a #pragma GCC visibility in scope, set the visibility of this
9339 // record.
9340 AddPushedVisibilityAttribute(New);
9341
Douglas Gregor402abb52009-05-28 23:31:59 +00009342 OwnedDecl = true;
Richard Smith37ec8d52012-12-05 11:34:06 +00009343 // In C++, don't return an invalid declaration. We can't recover well from
9344 // the cases where we make the type anonymous.
9345 return (Invalid && getLangOpts().CPlusPlus) ? 0 : New;
Reid Spencer5f016e22007-07-11 17:01:13 +00009346}
9347
John McCalld226f652010-08-21 09:40:31 +00009348void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) {
Douglas Gregoraaba5e32009-02-04 19:02:06 +00009349 AdjustDeclIfTemplate(TagD);
John McCalld226f652010-08-21 09:40:31 +00009350 TagDecl *Tag = cast<TagDecl>(TagD);
Douglas Gregor48c89f42010-04-24 16:38:41 +00009351
Douglas Gregor72de6672009-01-08 20:45:30 +00009352 // Enter the tag context.
9353 PushDeclContext(S, Tag);
Dmitri Gribenkoa5ef44f2012-07-11 21:38:39 +00009354
9355 ActOnDocumentableDecl(TagD);
Rafael Espindola5e065292012-07-12 04:47:34 +00009356
9357 // If there's a #pragma GCC visibility in scope, set the visibility of this
9358 // record.
9359 AddPushedVisibilityAttribute(Tag);
John McCallf9368152009-12-20 07:58:13 +00009360}
Douglas Gregor72de6672009-01-08 20:45:30 +00009361
Argyrios Kyrtzidis3a387442011-10-06 23:23:20 +00009362Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) {
Fariborz Jahaniana28948f2011-08-22 15:54:49 +00009363 assert(isa<ObjCContainerDecl>(IDecl) &&
9364 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl");
9365 DeclContext *OCD = cast<DeclContext>(IDecl);
9366 assert(getContainingDC(OCD) == CurContext &&
9367 "The next DeclContext should be lexically contained in the current one.");
9368 CurContext = OCD;
Argyrios Kyrtzidis3a387442011-10-06 23:23:20 +00009369 return IDecl;
Fariborz Jahaniana28948f2011-08-22 15:54:49 +00009370}
9371
John McCalld226f652010-08-21 09:40:31 +00009372void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD,
Anders Carlsson2c3ee542011-03-25 14:31:08 +00009373 SourceLocation FinalLoc,
John McCallf9368152009-12-20 07:58:13 +00009374 SourceLocation LBraceLoc) {
9375 AdjustDeclIfTemplate(TagD);
John McCalld226f652010-08-21 09:40:31 +00009376 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD);
Douglas Gregor72de6672009-01-08 20:45:30 +00009377
John McCallf9368152009-12-20 07:58:13 +00009378 FieldCollector->StartClass();
9379
9380 if (!Record->getIdentifier())
9381 return;
9382
Anders Carlsson2c3ee542011-03-25 14:31:08 +00009383 if (FinalLoc.isValid())
9384 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context));
Anders Carlssondfc2f102011-01-22 17:51:53 +00009385
John McCallf9368152009-12-20 07:58:13 +00009386 // C++ [class]p2:
9387 // [...] The class-name is also inserted into the scope of the
9388 // class itself; this is known as the injected-class-name. For
9389 // purposes of access checking, the injected-class-name is treated
9390 // as if it were a public member name.
9391 CXXRecordDecl *InjectedClassName
Abramo Bagnaraba877ad2011-03-09 14:09:51 +00009392 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext,
9393 Record->getLocStart(), Record->getLocation(),
John McCallf9368152009-12-20 07:58:13 +00009394 Record->getIdentifier(),
Argyrios Kyrtzidis3b8f6102010-10-14 20:14:21 +00009395 /*PrevDecl=*/0,
9396 /*DelayTypeCreation=*/true);
9397 Context.getTypeDeclType(InjectedClassName, Record);
John McCallf9368152009-12-20 07:58:13 +00009398 InjectedClassName->setImplicit();
9399 InjectedClassName->setAccess(AS_public);
9400 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate())
9401 InjectedClassName->setDescribedClassTemplate(Template);
9402 PushOnScopeChains(InjectedClassName, S);
9403 assert(InjectedClassName->isInjectedClassName() &&
9404 "Broken injected-class-name");
Douglas Gregor72de6672009-01-08 20:45:30 +00009405}
9406
John McCalld226f652010-08-21 09:40:31 +00009407void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD,
Argyrios Kyrtzidis07a5b282009-07-14 03:17:52 +00009408 SourceLocation RBraceLoc) {
Douglas Gregoraaba5e32009-02-04 19:02:06 +00009409 AdjustDeclIfTemplate(TagD);
John McCalld226f652010-08-21 09:40:31 +00009410 TagDecl *Tag = cast<TagDecl>(TagD);
Argyrios Kyrtzidis07a5b282009-07-14 03:17:52 +00009411 Tag->setRBraceLoc(RBraceLoc);
Douglas Gregor72de6672009-01-08 20:45:30 +00009412
Argyrios Kyrtzidis216f78b2012-03-09 20:10:30 +00009413 // Make sure we "complete" the definition even it is invalid.
9414 if (Tag->isBeingDefined()) {
9415 assert(Tag->isInvalidDecl() && "We should already have completed it");
9416 if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag))
9417 RD->completeDefinition();
9418 }
9419
Douglas Gregor72de6672009-01-08 20:45:30 +00009420 if (isa<CXXRecordDecl>(Tag))
9421 FieldCollector->FinishClass();
9422
9423 // Exit this scope of this tag's definition.
9424 PopDeclContext();
Douglas Gregoradda8462010-01-06 17:00:51 +00009425
Douglas Gregor72de6672009-01-08 20:45:30 +00009426 // Notify the consumer that we've defined a tag.
9427 Consumer.HandleTagDeclDefinition(Tag);
9428}
Chris Lattner5a6ddbf2008-06-21 19:39:06 +00009429
Fariborz Jahanian10af8792011-08-29 17:33:12 +00009430void Sema::ActOnObjCContainerFinishDefinition() {
Fariborz Jahaniana28948f2011-08-22 15:54:49 +00009431 // Exit this scope of this interface definition.
9432 PopDeclContext();
9433}
Argyrios Kyrtzidis3a387442011-10-06 23:23:20 +00009434
Argyrios Kyrtzidis458bacf2011-10-27 00:09:34 +00009435void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) {
Argyrios Kyrtzidis4a7dc8a2011-10-27 00:53:06 +00009436 assert(DC == CurContext && "Mismatch of container contexts");
9437 OriginalLexicalContext = DC;
Argyrios Kyrtzidis3a387442011-10-06 23:23:20 +00009438 ActOnObjCContainerFinishDefinition();
9439}
9440
Argyrios Kyrtzidis458bacf2011-10-27 00:09:34 +00009441void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) {
9442 ActOnObjCContainerStartDefinition(cast<Decl>(DC));
Argyrios Kyrtzidis3a387442011-10-06 23:23:20 +00009443 OriginalLexicalContext = 0;
9444}
9445
John McCalld226f652010-08-21 09:40:31 +00009446void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) {
John McCalldb7bb4a2010-03-17 00:38:33 +00009447 AdjustDeclIfTemplate(TagD);
John McCalld226f652010-08-21 09:40:31 +00009448 TagDecl *Tag = cast<TagDecl>(TagD);
John McCalldb7bb4a2010-03-17 00:38:33 +00009449 Tag->setInvalidDecl();
9450
Argyrios Kyrtzidis216f78b2012-03-09 20:10:30 +00009451 // Make sure we "complete" the definition even it is invalid.
9452 if (Tag->isBeingDefined()) {
9453 if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag))
9454 RD->completeDefinition();
9455 }
9456
John McCalla8cab012010-03-17 19:25:57 +00009457 // We're undoing ActOnTagStartDefinition here, not
9458 // ActOnStartCXXMemberDeclarations, so we don't have to mess with
9459 // the FieldCollector.
John McCalldb7bb4a2010-03-17 00:38:33 +00009460
9461 PopDeclContext();
9462}
9463
Chris Lattnerdf9bcd52009-04-20 17:29:38 +00009464// Note that FieldName may be null for anonymous bitfields.
Richard Smith282e7e62012-02-04 09:53:13 +00009465ExprResult Sema::VerifyBitField(SourceLocation FieldLoc,
9466 IdentifierInfo *FieldName,
9467 QualType FieldTy, Expr *BitWidth,
9468 bool *ZeroWidth) {
Eli Friedman1d954f62009-08-15 21:55:26 +00009469 // Default to true; that shouldn't confuse checks for emptiness
9470 if (ZeroWidth)
9471 *ZeroWidth = true;
9472
Chris Lattner24793662009-03-05 22:45:59 +00009473 // C99 6.7.2.1p4 - verify the field type.
Chris Lattner8b963ef2009-03-05 23:01:03 +00009474 // C++ 9.6p3: A bit-field shall have integral or enumeration type.
Douglas Gregor2ade35e2010-06-16 00:17:44 +00009475 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) {
Chris Lattner24793662009-03-05 22:45:59 +00009476 // Handle incomplete types with specific error.
Douglas Gregora03aca82009-03-10 21:58:27 +00009477 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete))
Richard Smith282e7e62012-02-04 09:53:13 +00009478 return ExprError();
Chris Lattnerdf9bcd52009-04-20 17:29:38 +00009479 if (FieldName)
9480 return Diag(FieldLoc, diag::err_not_integral_type_bitfield)
9481 << FieldName << FieldTy << BitWidth->getSourceRange();
9482 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield)
9483 << FieldTy << BitWidth->getSourceRange();
Douglas Gregore1862692010-12-15 23:18:36 +00009484 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth),
9485 UPPC_BitFieldWidth))
Richard Smith282e7e62012-02-04 09:53:13 +00009486 return ExprError();
Douglas Gregor3cf538d2009-03-11 18:59:21 +00009487
9488 // If the bit-width is type- or value-dependent, don't try to check
9489 // it now.
9490 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent())
Richard Smith282e7e62012-02-04 09:53:13 +00009491 return Owned(BitWidth);
Douglas Gregor3cf538d2009-03-11 18:59:21 +00009492
Anders Carlsson9f1e5722008-12-06 20:33:04 +00009493 llvm::APSInt Value;
Richard Smith282e7e62012-02-04 09:53:13 +00009494 ExprResult ICE = VerifyIntegerConstantExpression(BitWidth, &Value);
9495 if (ICE.isInvalid())
9496 return ICE;
9497 BitWidth = ICE.take();
Anders Carlsson9f1e5722008-12-06 20:33:04 +00009498
Eli Friedman1d954f62009-08-15 21:55:26 +00009499 if (Value != 0 && ZeroWidth)
9500 *ZeroWidth = false;
9501
Chris Lattnercd087072008-12-12 04:56:04 +00009502 // Zero-width bitfield is ok for anonymous field.
9503 if (Value == 0 && FieldName)
9504 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName;
Mike Stump1eb44332009-09-09 15:08:12 +00009505
Chris Lattnerdf9bcd52009-04-20 17:29:38 +00009506 if (Value.isSigned() && Value.isNegative()) {
9507 if (FieldName)
Mike Stump1eb44332009-09-09 15:08:12 +00009508 return Diag(FieldLoc, diag::err_bitfield_has_negative_width)
Chris Lattnerdf9bcd52009-04-20 17:29:38 +00009509 << FieldName << Value.toString(10);
9510 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width)
9511 << Value.toString(10);
9512 }
Anders Carlsson9f1e5722008-12-06 20:33:04 +00009513
Douglas Gregor3cf538d2009-03-11 18:59:21 +00009514 if (!FieldTy->isDependentType()) {
9515 uint64_t TypeSize = Context.getTypeSize(FieldTy);
Chris Lattnerdf9bcd52009-04-20 17:29:38 +00009516 if (Value.getZExtValue() > TypeSize) {
David Blaikie4e4d0842012-03-11 07:00:24 +00009517 if (!getLangOpts().CPlusPlus) {
Anders Carlsson72468ec2010-04-16 15:16:32 +00009518 if (FieldName)
9519 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size)
9520 << FieldName << (unsigned)Value.getZExtValue()
9521 << (unsigned)TypeSize;
9522
9523 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size)
9524 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize;
9525 }
9526
Chris Lattnerdf9bcd52009-04-20 17:29:38 +00009527 if (FieldName)
Anders Carlsson72468ec2010-04-16 15:16:32 +00009528 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size)
9529 << FieldName << (unsigned)Value.getZExtValue()
9530 << (unsigned)TypeSize;
9531 else
9532 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size)
9533 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize;
Chris Lattnerdf9bcd52009-04-20 17:29:38 +00009534 }
Douglas Gregor3cf538d2009-03-11 18:59:21 +00009535 }
Anders Carlsson9f1e5722008-12-06 20:33:04 +00009536
Richard Smith282e7e62012-02-04 09:53:13 +00009537 return Owned(BitWidth);
Anders Carlsson9f1e5722008-12-06 20:33:04 +00009538}
9539
Richard Smith7a614d82011-06-11 17:19:42 +00009540/// ActOnField - Each field of a C struct/union is passed into this in order
Reid Spencer5f016e22007-07-11 17:01:13 +00009541/// to create a FieldDecl object for it.
Richard Smith7a614d82011-06-11 17:19:42 +00009542Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart,
Richard Trieuf81e5a92011-09-09 02:00:50 +00009543 Declarator &D, Expr *BitfieldWidth) {
John McCalld226f652010-08-21 09:40:31 +00009544 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD),
Chris Lattnerb28317a2009-03-28 19:18:32 +00009545 DeclStart, D, static_cast<Expr*>(BitfieldWidth),
Richard Smithca523302012-06-10 03:12:00 +00009546 /*InitStyle=*/ICIS_NoInit, AS_public);
John McCalld226f652010-08-21 09:40:31 +00009547 return Res;
Chris Lattner24793662009-03-05 22:45:59 +00009548}
9549
9550/// HandleField - Analyze a field of a C struct or a C++ data member.
9551///
9552FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record,
9553 SourceLocation DeclStart,
Richard Smithca523302012-06-10 03:12:00 +00009554 Declarator &D, Expr *BitWidth,
9555 InClassInitStyle InitStyle,
Douglas Gregor4dd55f52009-03-11 20:50:30 +00009556 AccessSpecifier AS) {
Reid Spencer5f016e22007-07-11 17:01:13 +00009557 IdentifierInfo *II = D.getIdentifier();
Reid Spencer5f016e22007-07-11 17:01:13 +00009558 SourceLocation Loc = DeclStart;
9559 if (II) Loc = D.getIdentifierLoc();
Mike Stump1eb44332009-09-09 15:08:12 +00009560
John McCallbf1a0282010-06-04 23:28:52 +00009561 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
9562 QualType T = TInfo->getType();
David Blaikie4e4d0842012-03-11 07:00:24 +00009563 if (getLangOpts().CPlusPlus) {
Douglas Gregor3cf538d2009-03-11 18:59:21 +00009564 CheckExtraCXXDefaultArguments(D);
Douglas Gregor021c3b32009-03-11 23:00:04 +00009565
Douglas Gregore1862692010-12-15 23:18:36 +00009566 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
9567 UPPC_DataMemberType)) {
9568 D.setInvalidType();
9569 T = Context.IntTy;
9570 TInfo = Context.getTrivialTypeSourceInfo(T, Loc);
9571 }
9572 }
9573
Eli Friedman85a53192009-04-07 19:37:57 +00009574 DiagnoseFunctionSpecifiers(D);
9575
Eli Friedman63054b32009-04-19 20:27:55 +00009576 if (D.getDeclSpec().isThreadSpecified())
9577 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
Richard Smithaf1fc7a2011-08-15 21:04:07 +00009578 if (D.getDeclSpec().isConstexprSpecified())
9579 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr)
9580 << 2;
Douglas Gregor7f6ff022010-08-30 14:32:14 +00009581
9582 // Check to see if this name was declared as a member previously
Douglas Gregor95e55102011-10-21 15:47:52 +00009583 NamedDecl *PrevDecl = 0;
Douglas Gregor7f6ff022010-08-30 14:32:14 +00009584 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration);
9585 LookupName(Previous, S);
Douglas Gregor95e55102011-10-21 15:47:52 +00009586 switch (Previous.getResultKind()) {
9587 case LookupResult::Found:
9588 case LookupResult::FoundUnresolvedValue:
9589 PrevDecl = Previous.getAsSingle<NamedDecl>();
9590 break;
9591
9592 case LookupResult::FoundOverloaded:
9593 PrevDecl = Previous.getRepresentativeDecl();
9594 break;
9595
9596 case LookupResult::NotFound:
9597 case LookupResult::NotFoundInCurrentInstantiation:
9598 case LookupResult::Ambiguous:
9599 break;
9600 }
9601 Previous.suppressDiagnostics();
Douglas Gregorc19ee3e2009-06-17 23:37:01 +00009602
9603 if (PrevDecl && PrevDecl->isTemplateParameter()) {
9604 // Maybe we will complain about the shadowed template parameter.
9605 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
9606 // Just pretend that we didn't see the previous declaration.
9607 PrevDecl = 0;
9608 }
9609
Douglas Gregor3cf538d2009-03-11 18:59:21 +00009610 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S))
9611 PrevDecl = 0;
9612
Steve Naroffea218b82009-07-14 14:58:18 +00009613 bool Mutable
9614 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable);
Daniel Dunbar96a00142012-03-09 18:35:03 +00009615 SourceLocation TSSL = D.getLocStart();
Steve Naroffea218b82009-07-14 14:58:18 +00009616 FieldDecl *NewFD
Richard Smithca523302012-06-10 03:12:00 +00009617 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, InitStyle,
Richard Smith7a614d82011-06-11 17:19:42 +00009618 TSSL, AS, PrevDecl, &D);
Rafael Espindola01620702010-03-21 22:56:43 +00009619
9620 if (NewFD->isInvalidDecl())
9621 Record->setInvalidDecl();
9622
Douglas Gregor591dc842011-09-12 16:11:24 +00009623 if (D.getDeclSpec().isModulePrivateSpecified())
9624 NewFD->setModulePrivate();
9625
Douglas Gregor3cf538d2009-03-11 18:59:21 +00009626 if (NewFD->isInvalidDecl() && PrevDecl) {
9627 // Don't introduce NewFD into scope; there's already something
9628 // with the same name in the same scope.
9629 } else if (II) {
9630 PushOnScopeChains(NewFD, S);
9631 } else
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00009632 Record->addDecl(NewFD);
Douglas Gregor3cf538d2009-03-11 18:59:21 +00009633
9634 return NewFD;
9635}
9636
9637/// \brief Build a new FieldDecl and check its well-formedness.
9638///
9639/// This routine builds a new FieldDecl given the fields name, type,
9640/// record, etc. \p PrevDecl should refer to any previous declaration
9641/// with the same name and in the same scope as the field to be
9642/// created.
9643///
9644/// \returns a new FieldDecl.
9645///
Mike Stump1eb44332009-09-09 15:08:12 +00009646/// \todo The Declarator argument is a hack. It will be removed once
Argyrios Kyrtzidisa1d56622009-08-19 01:27:57 +00009647FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T,
John McCalla93c9342009-12-07 02:54:59 +00009648 TypeSourceInfo *TInfo,
Douglas Gregor3cf538d2009-03-11 18:59:21 +00009649 RecordDecl *Record, SourceLocation Loc,
Richard Smithca523302012-06-10 03:12:00 +00009650 bool Mutable, Expr *BitWidth,
9651 InClassInitStyle InitStyle,
Steve Naroffea218b82009-07-14 14:58:18 +00009652 SourceLocation TSSL,
Douglas Gregor4dd55f52009-03-11 20:50:30 +00009653 AccessSpecifier AS, NamedDecl *PrevDecl,
Douglas Gregor3cf538d2009-03-11 18:59:21 +00009654 Declarator *D) {
9655 IdentifierInfo *II = Name.getAsIdentifierInfo();
Steve Naroff5912a352007-08-28 20:14:24 +00009656 bool InvalidDecl = false;
Chris Lattnereaaebc72009-04-25 08:06:05 +00009657 if (D) InvalidDecl = D->isInvalidType();
Sebastian Redl64b45f72009-01-05 20:52:13 +00009658
Douglas Gregor3cf538d2009-03-11 18:59:21 +00009659 // If we receive a broken type, recover by assuming 'int' and
9660 // marking this declaration as invalid.
9661 if (T.isNull()) {
9662 InvalidDecl = true;
9663 T = Context.IntTy;
9664 }
9665
Eli Friedman721e77d2009-12-07 00:22:08 +00009666 QualType EltTy = Context.getBaseElementType(T);
Argyrios Kyrtzidis216f78b2012-03-09 20:10:30 +00009667 if (!EltTy->isDependentType()) {
9668 if (RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) {
9669 // Fields of incomplete type force their record to be invalid.
9670 Record->setInvalidDecl();
9671 InvalidDecl = true;
9672 } else {
9673 NamedDecl *Def;
9674 EltTy->isIncompleteType(&Def);
9675 if (Def && Def->isInvalidDecl()) {
9676 Record->setInvalidDecl();
9677 InvalidDecl = true;
9678 }
9679 }
John McCall2d7d2d92010-08-16 23:42:35 +00009680 }
Eli Friedman721e77d2009-12-07 00:22:08 +00009681
Reid Spencer5f016e22007-07-11 17:01:13 +00009682 // C99 6.7.2.1p8: A member of a structure or union may have any type other
9683 // than a variably modified type.
Eli Friedman721e77d2009-12-07 00:22:08 +00009684 if (!InvalidDecl && T->isVariablyModifiedType()) {
Eli Friedman1ca48132009-02-21 00:44:51 +00009685 bool SizeIsNegative;
Douglas Gregor2767ce22010-08-18 00:39:00 +00009686 llvm::APSInt Oversized;
Abramo Bagnara4c5750e2012-11-08 14:44:42 +00009687
9688 TypeSourceInfo *FixedTInfo =
9689 TryToFixInvalidVariablyModifiedTypeSourceInfo(TInfo, Context,
9690 SizeIsNegative,
9691 Oversized);
9692 if (FixedTInfo) {
Eli Friedman1ca48132009-02-21 00:44:51 +00009693 Diag(Loc, diag::warn_illegal_constant_array_size);
Abramo Bagnara4c5750e2012-11-08 14:44:42 +00009694 TInfo = FixedTInfo;
9695 T = FixedTInfo->getType();
Eli Friedman1ca48132009-02-21 00:44:51 +00009696 } else {
9697 if (SizeIsNegative)
9698 Diag(Loc, diag::err_typecheck_negative_array_size);
Douglas Gregor2767ce22010-08-18 00:39:00 +00009699 else if (Oversized.getBoolValue())
9700 Diag(Loc, diag::err_array_too_large)
9701 << Oversized.toString(10);
Eli Friedman1ca48132009-02-21 00:44:51 +00009702 else
9703 Diag(Loc, diag::err_typecheck_field_variable_size);
Eli Friedman1ca48132009-02-21 00:44:51 +00009704 InvalidDecl = true;
9705 }
Reid Spencer5f016e22007-07-11 17:01:13 +00009706 }
Mike Stump1eb44332009-09-09 15:08:12 +00009707
Anders Carlsson4681ebd2009-03-22 20:18:17 +00009708 // Fields can not have abstract class types
Eli Friedman721e77d2009-12-07 00:22:08 +00009709 if (!InvalidDecl && RequireNonAbstractType(Loc, T,
9710 diag::err_abstract_type_in_decl,
9711 AbstractFieldType))
Anders Carlsson4681ebd2009-03-22 20:18:17 +00009712 InvalidDecl = true;
Mike Stump1eb44332009-09-09 15:08:12 +00009713
Eli Friedman1d954f62009-08-15 21:55:26 +00009714 bool ZeroWidth = false;
Douglas Gregor3cf538d2009-03-11 18:59:21 +00009715 // If this is declared as a bit-field, check the bit-field.
Richard Smith282e7e62012-02-04 09:53:13 +00009716 if (!InvalidDecl && BitWidth) {
9717 BitWidth = VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth).take();
9718 if (!BitWidth) {
9719 InvalidDecl = true;
9720 BitWidth = 0;
9721 ZeroWidth = false;
9722 }
Anders Carlsson9f1e5722008-12-06 20:33:04 +00009723 }
Mike Stump1eb44332009-09-09 15:08:12 +00009724
John McCall4bde1e12010-06-04 08:34:12 +00009725 // Check that 'mutable' is consistent with the type of the declaration.
9726 if (!InvalidDecl && Mutable) {
9727 unsigned DiagID = 0;
9728 if (T->isReferenceType())
9729 DiagID = diag::err_mutable_reference;
9730 else if (T.isConstQualified())
9731 DiagID = diag::err_mutable_const;
9732
9733 if (DiagID) {
9734 SourceLocation ErrLoc = Loc;
9735 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid())
9736 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc();
9737 Diag(ErrLoc, DiagID);
9738 Mutable = false;
9739 InvalidDecl = true;
9740 }
9741 }
9742
Abramo Bagnaraff676cb2011-03-08 08:55:46 +00009743 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo,
Richard Smithca523302012-06-10 03:12:00 +00009744 BitWidth, Mutable, InitStyle);
Chris Lattnereaaebc72009-04-25 08:06:05 +00009745 if (InvalidDecl)
9746 NewFD->setInvalidDecl();
Douglas Gregor44b43212008-12-11 16:49:14 +00009747
Douglas Gregor3cf538d2009-03-11 18:59:21 +00009748 if (PrevDecl && !isa<TagDecl>(PrevDecl)) {
9749 Diag(Loc, diag::err_duplicate_member) << II;
9750 Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
9751 NewFD->setInvalidDecl();
Douglas Gregor72de6672009-01-08 20:45:30 +00009752 }
9753
David Blaikie4e4d0842012-03-11 07:00:24 +00009754 if (!InvalidDecl && getLangOpts().CPlusPlus) {
Anders Carlssondfdfc582010-11-07 19:13:55 +00009755 if (Record->isUnion()) {
9756 if (const RecordType *RT = EltTy->getAs<RecordType>()) {
9757 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl());
9758 if (RDecl->getDefinition()) {
9759 // C++ [class.union]p1: An object of a class with a non-trivial
9760 // constructor, a non-trivial copy constructor, a non-trivial
9761 // destructor, or a non-trivial copy assignment operator
9762 // cannot be a member of a union, nor can an array of such
9763 // objects.
Richard Smithe7d7c392011-10-19 20:41:51 +00009764 if (CheckNontrivialField(NewFD))
Anders Carlssondfdfc582010-11-07 19:13:55 +00009765 NewFD->setInvalidDecl();
9766 }
9767 }
9768
9769 // C++ [class.union]p1: If a union contains a member of reference type,
9770 // the program is ill-formed.
9771 if (EltTy->isReferenceType()) {
9772 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type)
9773 << NewFD->getDeclName() << EltTy;
9774 NewFD->setInvalidDecl();
Douglas Gregor1f2023a2009-07-22 18:25:24 +00009775 }
9776 }
9777 }
9778
Douglas Gregor3cf538d2009-03-11 18:59:21 +00009779 // FIXME: We need to pass in the attributes given an AST
9780 // representation, not a parser representation.
9781 if (D)
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00009782 // FIXME: What to pass instead of TUScope?
9783 ProcessDeclAttributes(TUScope, NewFD, *D);
Douglas Gregor3cf538d2009-03-11 18:59:21 +00009784
John McCallf85e1932011-06-15 23:02:42 +00009785 // In auto-retain/release, infer strong retension for fields of
9786 // retainable type.
David Blaikie4e4d0842012-03-11 07:00:24 +00009787 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewFD))
John McCallf85e1932011-06-15 23:02:42 +00009788 NewFD->setInvalidDecl();
9789
Fariborz Jahanianf6123ca2009-02-19 00:22:47 +00009790 if (T.isObjCGCWeak())
Fariborz Jahanianed7e9ef2009-02-18 18:14:41 +00009791 Diag(Loc, diag::warn_attribute_weak_on_field);
Anders Carlssonad148062008-02-16 00:29:18 +00009792
Douglas Gregor4dd55f52009-03-11 20:50:30 +00009793 NewFD->setAccess(AS);
Steve Naroff5912a352007-08-28 20:14:24 +00009794 return NewFD;
Reid Spencer5f016e22007-07-11 17:01:13 +00009795}
9796
Argyrios Kyrtzidisdd7744d2010-08-16 17:27:08 +00009797bool Sema::CheckNontrivialField(FieldDecl *FD) {
9798 assert(FD);
David Blaikie4e4d0842012-03-11 07:00:24 +00009799 assert(getLangOpts().CPlusPlus && "valid check only for C++");
Argyrios Kyrtzidisdd7744d2010-08-16 17:27:08 +00009800
9801 if (FD->isInvalidDecl())
9802 return true;
9803
9804 QualType EltTy = Context.getBaseElementType(FD->getType());
9805 if (const RecordType *RT = EltTy->getAs<RecordType>()) {
Richard Smithac713512012-12-08 02:53:02 +00009806 CXXRecordDecl *RDecl = cast<CXXRecordDecl>(RT->getDecl());
Argyrios Kyrtzidisdd7744d2010-08-16 17:27:08 +00009807 if (RDecl->getDefinition()) {
9808 // We check for copy constructors before constructors
9809 // because otherwise we'll never get complaints about
9810 // copy constructors.
9811
9812 CXXSpecialMember member = CXXInvalid;
Richard Smith426391c2012-11-16 00:53:38 +00009813 // We're required to check for any non-trivial constructors. Since the
9814 // implicit default constructor is suppressed if there are any
9815 // user-declared constructors, we just need to check that there is a
9816 // trivial default constructor and a trivial copy constructor. (We don't
9817 // worry about move constructors here, since this is a C++98 check.)
9818 if (RDecl->hasNonTrivialCopyConstructor())
Argyrios Kyrtzidisdd7744d2010-08-16 17:27:08 +00009819 member = CXXCopyConstructor;
Sean Hunt023df372011-05-09 18:22:59 +00009820 else if (!RDecl->hasTrivialDefaultConstructor())
Sean Huntf961ea52011-05-10 19:08:14 +00009821 member = CXXDefaultConstructor;
Richard Smith426391c2012-11-16 00:53:38 +00009822 else if (RDecl->hasNonTrivialCopyAssignment())
Argyrios Kyrtzidisdd7744d2010-08-16 17:27:08 +00009823 member = CXXCopyAssignment;
Richard Smith426391c2012-11-16 00:53:38 +00009824 else if (RDecl->hasNonTrivialDestructor())
Argyrios Kyrtzidisdd7744d2010-08-16 17:27:08 +00009825 member = CXXDestructor;
9826
9827 if (member != CXXInvalid) {
David Blaikie4e4d0842012-03-11 07:00:24 +00009828 if (!getLangOpts().CPlusPlus0x &&
9829 getLangOpts().ObjCAutoRefCount && RDecl->hasObjectMember()) {
John McCallf85e1932011-06-15 23:02:42 +00009830 // Objective-C++ ARC: it is an error to have a non-trivial field of
9831 // a union. However, system headers in Objective-C programs
9832 // occasionally have Objective-C lifetime objects within unions,
9833 // and rather than cause the program to fail, we make those
9834 // members unavailable.
9835 SourceLocation Loc = FD->getLocation();
9836 if (getSourceManager().isInSystemHeader(Loc)) {
9837 if (!FD->hasAttr<UnavailableAttr>())
9838 FD->addAttr(new (Context) UnavailableAttr(Loc, Context,
Argyrios Kyrtzidisb8b03132011-06-24 00:08:59 +00009839 "this system field has retaining ownership"));
John McCallf85e1932011-06-15 23:02:42 +00009840 return false;
9841 }
9842 }
Richard Smithe7d7c392011-10-19 20:41:51 +00009843
David Blaikie4e4d0842012-03-11 07:00:24 +00009844 Diag(FD->getLocation(), getLangOpts().CPlusPlus0x ?
Richard Smithe7d7c392011-10-19 20:41:51 +00009845 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member :
9846 diag::err_illegal_union_or_anon_struct_member)
9847 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member;
Richard Smithac713512012-12-08 02:53:02 +00009848 DiagnoseNontrivial(RDecl, member);
David Blaikie4e4d0842012-03-11 07:00:24 +00009849 return !getLangOpts().CPlusPlus0x;
Argyrios Kyrtzidisdd7744d2010-08-16 17:27:08 +00009850 }
9851 }
9852 }
Richard Smithac713512012-12-08 02:53:02 +00009853
Argyrios Kyrtzidisdd7744d2010-08-16 17:27:08 +00009854 return false;
9855}
9856
Mike Stump1eb44332009-09-09 15:08:12 +00009857/// TranslateIvarVisibility - Translate visibility from a token ID to an
Fariborz Jahanian89204a12007-10-01 16:53:59 +00009858/// AST enum value.
Ted Kremeneka526c5c2008-01-07 19:49:32 +00009859static ObjCIvarDecl::AccessControl
Fariborz Jahanian89204a12007-10-01 16:53:59 +00009860TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) {
Steve Narofff13271f2007-09-14 23:09:53 +00009861 switch (ivarVisibility) {
David Blaikieb219cfc2011-09-23 05:06:16 +00009862 default: llvm_unreachable("Unknown visitibility kind");
Chris Lattner33d34a62008-10-12 00:28:42 +00009863 case tok::objc_private: return ObjCIvarDecl::Private;
9864 case tok::objc_public: return ObjCIvarDecl::Public;
9865 case tok::objc_protected: return ObjCIvarDecl::Protected;
9866 case tok::objc_package: return ObjCIvarDecl::Package;
Steve Narofff13271f2007-09-14 23:09:53 +00009867 }
9868}
9869
Mike Stump1eb44332009-09-09 15:08:12 +00009870/// ActOnIvar - Each ivar field of an objective-c class is passed into this
Fariborz Jahanian45bc03f2008-04-11 16:55:42 +00009871/// in order to create an IvarDecl object for it.
John McCalld226f652010-08-21 09:40:31 +00009872Decl *Sema::ActOnIvar(Scope *S,
Mike Stump1eb44332009-09-09 15:08:12 +00009873 SourceLocation DeclStart,
Richard Trieuf81e5a92011-09-09 02:00:50 +00009874 Declarator &D, Expr *BitfieldWidth,
Chris Lattnerb28317a2009-03-28 19:18:32 +00009875 tok::ObjCKeywordKind Visibility) {
Mike Stump1eb44332009-09-09 15:08:12 +00009876
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00009877 IdentifierInfo *II = D.getIdentifier();
9878 Expr *BitWidth = (Expr*)BitfieldWidth;
9879 SourceLocation Loc = DeclStart;
9880 if (II) Loc = D.getIdentifierLoc();
Mike Stump1eb44332009-09-09 15:08:12 +00009881
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00009882 // FIXME: Unnamed fields can be handled in various different ways, for
9883 // example, unnamed unions inject all members into the struct namespace!
Mike Stump1eb44332009-09-09 15:08:12 +00009884
John McCallbf1a0282010-06-04 23:28:52 +00009885 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
9886 QualType T = TInfo->getType();
Mike Stump1eb44332009-09-09 15:08:12 +00009887
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00009888 if (BitWidth) {
Steve Naroff63359c82009-02-20 17:57:11 +00009889 // 6.7.2.1p3, 6.7.2.1p4
Richard Smith282e7e62012-02-04 09:53:13 +00009890 BitWidth = VerifyBitField(Loc, II, T, BitWidth).take();
9891 if (!BitWidth)
Chris Lattnereaaebc72009-04-25 08:06:05 +00009892 D.setInvalidType();
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00009893 } else {
9894 // Not a bitfield.
Mike Stump1eb44332009-09-09 15:08:12 +00009895
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00009896 // validate II.
Mike Stump1eb44332009-09-09 15:08:12 +00009897
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00009898 }
Fariborz Jahanian0b7bc8e2010-04-26 22:07:03 +00009899 if (T->isReferenceType()) {
9900 Diag(Loc, diag::err_ivar_reference_type);
9901 D.setInvalidType();
9902 }
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00009903 // C99 6.7.2.1p8: A member of a structure or union may have any type other
9904 // than a variably modified type.
Fariborz Jahanian0b7bc8e2010-04-26 22:07:03 +00009905 else if (T->isVariablyModifiedType()) {
Anders Carlsson96e05bc2008-12-07 00:20:55 +00009906 Diag(Loc, diag::err_typecheck_ivar_variable_size);
Chris Lattnereaaebc72009-04-25 08:06:05 +00009907 D.setInvalidType();
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00009908 }
Mike Stump1eb44332009-09-09 15:08:12 +00009909
Ted Kremenekb8db21d2008-07-23 18:04:17 +00009910 // Get the visibility (access control) for this ivar.
Mike Stump1eb44332009-09-09 15:08:12 +00009911 ObjCIvarDecl::AccessControl ac =
Ted Kremenekb8db21d2008-07-23 18:04:17 +00009912 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility)
9913 : ObjCIvarDecl::None;
Fariborz Jahanian496b5a82009-06-05 18:16:35 +00009914 // Must set ivar's DeclContext to its enclosing interface.
Fariborz Jahaniana28948f2011-08-22 15:54:49 +00009915 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext);
Fariborz Jahanianc645ddf2012-02-02 00:49:12 +00009916 if (!EnclosingDecl || EnclosingDecl->isInvalidDecl())
9917 return 0;
Daniel Dunbara19331f2010-04-02 18:29:09 +00009918 ObjCContainerDecl *EnclosingContext;
Mike Stump1eb44332009-09-09 15:08:12 +00009919 if (ObjCImplementationDecl *IMPDecl =
Fariborz Jahanian496b5a82009-06-05 18:16:35 +00009920 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) {
John McCall260611a2012-06-20 06:18:46 +00009921 if (LangOpts.ObjCRuntime.isFragile()) {
Fariborz Jahanian496b5a82009-06-05 18:16:35 +00009922 // Case of ivar declared in an implementation. Context is that of its class.
Fariborz Jahanian000835d2010-08-23 18:51:39 +00009923 EnclosingContext = IMPDecl->getClassInterface();
9924 assert(EnclosingContext && "Implementation has no class interface!");
9925 }
9926 else
9927 EnclosingContext = EnclosingDecl;
Fariborz Jahanian0bd04592010-04-06 22:43:48 +00009928 } else {
9929 if (ObjCCategoryDecl *CDecl =
9930 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) {
John McCall260611a2012-06-20 06:18:46 +00009931 if (LangOpts.ObjCRuntime.isFragile() || !CDecl->IsClassExtension()) {
Fariborz Jahanian0bd04592010-04-06 22:43:48 +00009932 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension();
John McCalld226f652010-08-21 09:40:31 +00009933 return 0;
Fariborz Jahanian0bd04592010-04-06 22:43:48 +00009934 }
9935 }
Daniel Dunbara19331f2010-04-02 18:29:09 +00009936 EnclosingContext = EnclosingDecl;
Fariborz Jahanian0bd04592010-04-06 22:43:48 +00009937 }
Mike Stump1eb44332009-09-09 15:08:12 +00009938
Ted Kremenekb8db21d2008-07-23 18:04:17 +00009939 // Construct the decl.
Abramo Bagnaraff676cb2011-03-08 08:55:46 +00009940 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext,
9941 DeclStart, Loc, II, T,
John McCalla93c9342009-12-07 02:54:59 +00009942 TInfo, ac, (Expr *)BitfieldWidth);
Mike Stump1eb44332009-09-09 15:08:12 +00009943
Douglas Gregor72de6672009-01-08 20:45:30 +00009944 if (II) {
Douglas Gregorc83c6872010-04-15 22:33:43 +00009945 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName,
John McCall7d384dd2009-11-18 07:57:50 +00009946 ForRedeclaration);
Fariborz Jahanian496b5a82009-06-05 18:16:35 +00009947 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S)
Douglas Gregor72de6672009-01-08 20:45:30 +00009948 && !isa<TagDecl>(PrevDecl)) {
9949 Diag(Loc, diag::err_duplicate_member) << II;
9950 Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
9951 NewID->setInvalidDecl();
9952 }
9953 }
9954
Ted Kremenekb8db21d2008-07-23 18:04:17 +00009955 // Process attributes attached to the ivar.
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00009956 ProcessDeclAttributes(S, NewID, D);
Mike Stump1eb44332009-09-09 15:08:12 +00009957
Chris Lattnereaaebc72009-04-25 08:06:05 +00009958 if (D.isInvalidType())
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00009959 NewID->setInvalidDecl();
Ted Kremenekb8db21d2008-07-23 18:04:17 +00009960
John McCallf85e1932011-06-15 23:02:42 +00009961 // In ARC, infer 'retaining' for ivars of retainable type.
David Blaikie4e4d0842012-03-11 07:00:24 +00009962 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewID))
John McCallf85e1932011-06-15 23:02:42 +00009963 NewID->setInvalidDecl();
9964
Douglas Gregor591dc842011-09-12 16:11:24 +00009965 if (D.getDeclSpec().isModulePrivateSpecified())
9966 NewID->setModulePrivate();
9967
Douglas Gregor72de6672009-01-08 20:45:30 +00009968 if (II) {
9969 // FIXME: When interfaces are DeclContexts, we'll need to add
9970 // these to the interface.
John McCalld226f652010-08-21 09:40:31 +00009971 S->AddDecl(NewID);
Douglas Gregor72de6672009-01-08 20:45:30 +00009972 IdResolver.AddDecl(NewID);
9973 }
Fariborz Jahanian8f674a82012-05-15 16:33:04 +00009974
John McCall260611a2012-06-20 06:18:46 +00009975 if (LangOpts.ObjCRuntime.isNonFragile() &&
Fariborz Jahanian8f674a82012-05-15 16:33:04 +00009976 !NewID->isInvalidDecl() && isa<ObjCInterfaceDecl>(EnclosingDecl))
Fariborz Jahaniandc3eb6a2012-05-15 17:43:16 +00009977 Diag(Loc, diag::warn_ivars_in_interface);
Fariborz Jahanian8f674a82012-05-15 16:33:04 +00009978
John McCalld226f652010-08-21 09:40:31 +00009979 return NewID;
Fariborz Jahanian1d78cc42008-04-10 23:32:45 +00009980}
9981
Fariborz Jahaniand097be82010-08-23 22:46:52 +00009982/// ActOnLastBitfield - This routine handles synthesized bitfields rules for
9983/// class and class extensions. For every class @interface and class
9984/// extension @interface, if the last ivar is a bitfield of any type,
9985/// then add an implicit `char :0` ivar to the end of that interface.
Fariborz Jahaniana28948f2011-08-22 15:54:49 +00009986void Sema::ActOnLastBitfield(SourceLocation DeclLoc,
Chris Lattner5f9e2722011-07-23 10:55:15 +00009987 SmallVectorImpl<Decl *> &AllIvarDecls) {
John McCall260611a2012-06-20 06:18:46 +00009988 if (LangOpts.ObjCRuntime.isFragile() || AllIvarDecls.empty())
Fariborz Jahaniand097be82010-08-23 22:46:52 +00009989 return;
9990
9991 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1];
9992 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl);
9993
Richard Smitha6b8b2c2011-10-10 18:28:20 +00009994 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0)
Fariborz Jahaniand097be82010-08-23 22:46:52 +00009995 return;
Fariborz Jahaniana28948f2011-08-22 15:54:49 +00009996 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext);
Fariborz Jahaniand097be82010-08-23 22:46:52 +00009997 if (!ID) {
Fariborz Jahaniana28948f2011-08-22 15:54:49 +00009998 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) {
Fariborz Jahaniand097be82010-08-23 22:46:52 +00009999 if (!CD->IsClassExtension())
10000 return;
10001 }
10002 // No need to add this to end of @implementation.
10003 else
10004 return;
10005 }
10006 // All conditions are met. Add a new bitfield to the tail end of ivars.
Douglas Gregor0bbea1b2011-08-03 16:26:46 +000010007 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0);
10008 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc);
Fariborz Jahaniand097be82010-08-23 22:46:52 +000010009
Fariborz Jahaniana28948f2011-08-22 15:54:49 +000010010 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext),
Abramo Bagnaraff676cb2011-03-08 08:55:46 +000010011 DeclLoc, DeclLoc, 0,
Fariborz Jahaniand097be82010-08-23 22:46:52 +000010012 Context.CharTy,
Douglas Gregor0bbea1b2011-08-03 16:26:46 +000010013 Context.getTrivialTypeSourceInfo(Context.CharTy,
10014 DeclLoc),
Fariborz Jahaniand097be82010-08-23 22:46:52 +000010015 ObjCIvarDecl::Private, BW,
10016 true);
10017 AllIvarDecls.push_back(Ivar);
10018}
10019
Fariborz Jahanian9d048ff2007-09-29 00:54:24 +000010020void Sema::ActOnFields(Scope* S,
John McCalld226f652010-08-21 09:40:31 +000010021 SourceLocation RecLoc, Decl *EnclosingDecl,
David Blaikie77b6de02011-09-22 02:58:26 +000010022 llvm::ArrayRef<Decl *> Fields,
Daniel Dunbar1bfe1c22008-10-03 02:03:53 +000010023 SourceLocation LBrac, SourceLocation RBrac,
Daniel Dunbar7d076642008-10-03 17:33:35 +000010024 AttributeList *Attr) {
Steve Naroff74216642007-09-14 22:20:54 +000010025 assert(EnclosingDecl && "missing record or interface decl");
Mike Stump1eb44332009-09-09 15:08:12 +000010026
Eric Christopher6dba4a12012-07-19 22:22:51 +000010027 // If this is an Objective-C @implementation or category and we have
10028 // new fields here we should reset the layout of the interface since
10029 // it will now change.
10030 if (!Fields.empty() && isa<ObjCContainerDecl>(EnclosingDecl)) {
10031 ObjCContainerDecl *DC = cast<ObjCContainerDecl>(EnclosingDecl);
10032 switch (DC->getKind()) {
10033 default: break;
10034 case Decl::ObjCCategory:
10035 Context.ResetObjCLayout(cast<ObjCCategoryDecl>(DC)->getClassInterface());
10036 break;
10037 case Decl::ObjCImplementation:
10038 Context.
10039 ResetObjCLayout(cast<ObjCImplementationDecl>(DC)->getClassInterface());
10040 break;
10041 }
10042 }
10043
Eli Friedman11e70d72012-02-07 05:00:47 +000010044 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl);
10045
10046 // Start counting up the number of named members; make sure to include
10047 // members of anonymous structs and unions in the total.
Reid Spencer5f016e22007-07-11 17:01:13 +000010048 unsigned NumNamedMembers = 0;
Eli Friedman11e70d72012-02-07 05:00:47 +000010049 if (Record) {
10050 for (RecordDecl::decl_iterator i = Record->decls_begin(),
10051 e = Record->decls_end(); i != e; i++) {
10052 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(*i))
10053 if (IFD->getDeclName())
10054 ++NumNamedMembers;
10055 }
10056 }
10057
10058 // Verify that all the fields are okay.
Chris Lattner5f9e2722011-07-23 10:55:15 +000010059 SmallVector<FieldDecl*, 32> RecFields;
Douglas Gregor6b3945f2009-01-07 19:46:03 +000010060
John McCallf85e1932011-06-15 23:02:42 +000010061 bool ARCErrReported = false;
David Blaikie77b6de02011-09-22 02:58:26 +000010062 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end();
10063 i != end; ++i) {
10064 FieldDecl *FD = cast<FieldDecl>(*i);
Mike Stump1eb44332009-09-09 15:08:12 +000010065
Reid Spencer5f016e22007-07-11 17:01:13 +000010066 // Get the type for the field.
John McCallf4c73712011-01-19 06:33:43 +000010067 const Type *FDTy = FD->getType().getTypePtr();
Douglas Gregor6b3945f2009-01-07 19:46:03 +000010068
Douglas Gregor72de6672009-01-08 20:45:30 +000010069 if (!FD->isAnonymousStructOrUnion()) {
Douglas Gregor6b3945f2009-01-07 19:46:03 +000010070 // Remember all fields written by the user.
10071 RecFields.push_back(FD);
10072 }
Mike Stump1eb44332009-09-09 15:08:12 +000010073
Chris Lattner24793662009-03-05 22:45:59 +000010074 // If the field is already invalid for some reason, don't emit more
10075 // diagnostics about it.
Eli Friedman721e77d2009-12-07 00:22:08 +000010076 if (FD->isInvalidDecl()) {
10077 EnclosingDecl->setInvalidDecl();
Chris Lattner24793662009-03-05 22:45:59 +000010078 continue;
Eli Friedman721e77d2009-12-07 00:22:08 +000010079 }
Mike Stump1eb44332009-09-09 15:08:12 +000010080
Douglas Gregore7450f52009-03-24 19:52:54 +000010081 // C99 6.7.2.1p2:
10082 // A structure or union shall not contain a member with
10083 // incomplete or function type (hence, a structure shall not
10084 // contain an instance of itself, but may contain a pointer to
10085 // an instance of itself), except that the last member of a
10086 // structure with more than one named member may have incomplete
10087 // array type; such a structure (and any union containing,
10088 // possibly recursively, a member that is such a structure)
10089 // shall not be a member of a structure or an element of an
10090 // array.
Chris Lattner02c642e2007-07-31 21:33:24 +000010091 if (FDTy->isFunctionType()) {
Douglas Gregore7450f52009-03-24 19:52:54 +000010092 // Field declared as a function.
Chris Lattnerf3a41af2008-11-20 06:38:18 +000010093 Diag(FD->getLocation(), diag::err_field_declared_as_function)
Chris Lattnerd9d22dd2008-11-24 05:29:24 +000010094 << FD->getDeclName();
Steve Naroff74216642007-09-14 22:20:54 +000010095 FD->setInvalidDecl();
10096 EnclosingDecl->setInvalidDecl();
Reid Spencer5f016e22007-07-11 17:01:13 +000010097 continue;
Francois Pichet09246182010-09-15 00:14:08 +000010098 } else if (FDTy->isIncompleteArrayType() && Record &&
David Blaikie77b6de02011-09-22 02:58:26 +000010099 ((i + 1 == Fields.end() && !Record->isUnion()) ||
David Blaikie4e4d0842012-03-11 07:00:24 +000010100 ((getLangOpts().MicrosoftExt ||
10101 getLangOpts().CPlusPlus) &&
David Blaikie77b6de02011-09-22 02:58:26 +000010102 (i + 1 == Fields.end() || Record->isUnion())))) {
Douglas Gregore7450f52009-03-24 19:52:54 +000010103 // Flexible array member.
Argyrios Kyrtzidisd97cec32011-03-07 20:04:04 +000010104 // Microsoft and g++ is more permissive regarding flexible array.
Francois Pichet09246182010-09-15 00:14:08 +000010105 // It will accept flexible array in union and also
Anders Carlsson4d09e842010-10-17 23:36:12 +000010106 // as the sole element of a struct/class.
David Blaikie4e4d0842012-03-11 07:00:24 +000010107 if (getLangOpts().MicrosoftExt) {
Francois Pichet09246182010-09-15 00:14:08 +000010108 if (Record->isUnion())
Argyrios Kyrtzidisd97cec32011-03-07 20:04:04 +000010109 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms)
Francois Pichet09246182010-09-15 00:14:08 +000010110 << FD->getDeclName();
David Blaikie77b6de02011-09-22 02:58:26 +000010111 else if (Fields.size() == 1)
Argyrios Kyrtzidisd97cec32011-03-07 20:04:04 +000010112 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms)
Francois Pichet09246182010-09-15 00:14:08 +000010113 << FD->getDeclName() << Record->getTagKind();
David Blaikie4e4d0842012-03-11 07:00:24 +000010114 } else if (getLangOpts().CPlusPlus) {
Argyrios Kyrtzidisd97cec32011-03-07 20:04:04 +000010115 if (Record->isUnion())
10116 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu)
10117 << FD->getDeclName();
David Blaikie77b6de02011-09-22 02:58:26 +000010118 else if (Fields.size() == 1)
Argyrios Kyrtzidisd97cec32011-03-07 20:04:04 +000010119 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu)
10120 << FD->getDeclName() << Record->getTagKind();
David Chisnall0961a012012-03-16 12:15:37 +000010121 } else if (!getLangOpts().C99) {
10122 if (Record->isUnion())
10123 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu)
10124 << FD->getDeclName();
10125 else
10126 Diag(FD->getLocation(), diag::ext_c99_flexible_array_member)
10127 << FD->getDeclName() << Record->getTagKind();
Argyrios Kyrtzidisd97cec32011-03-07 20:04:04 +000010128 } else if (NumNamedMembers < 1) {
Chris Lattnerf3a41af2008-11-20 06:38:18 +000010129 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct)
Chris Lattnerd9d22dd2008-11-24 05:29:24 +000010130 << FD->getDeclName();
Steve Naroff74216642007-09-14 22:20:54 +000010131 FD->setInvalidDecl();
10132 EnclosingDecl->setInvalidDecl();
Reid Spencer5f016e22007-07-11 17:01:13 +000010133 continue;
10134 }
Fariborz Jahanian4142ceb2010-05-26 20:19:07 +000010135 if (!FD->getType()->isDependentType() &&
John McCallf85e1932011-06-15 23:02:42 +000010136 !Context.getBaseElementType(FD->getType()).isPODType(Context)) {
Fariborz Jahanian4142ceb2010-05-26 20:19:07 +000010137 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type)
Fariborz Jahanian2c0a5402010-05-26 20:46:24 +000010138 << FD->getDeclName() << FD->getType();
Fariborz Jahanian4142ceb2010-05-26 20:19:07 +000010139 FD->setInvalidDecl();
10140 EnclosingDecl->setInvalidDecl();
10141 continue;
10142 }
Reid Spencer5f016e22007-07-11 17:01:13 +000010143 // Okay, we have a legal flexible array member at the end of the struct.
Fariborz Jahaniane267ab62007-09-14 16:27:55 +000010144 if (Record)
10145 Record->setHasFlexibleArrayMember(true);
Douglas Gregore7450f52009-03-24 19:52:54 +000010146 } else if (!FDTy->isDependentType() &&
Mike Stump1eb44332009-09-09 15:08:12 +000010147 RequireCompleteType(FD->getLocation(), FD->getType(),
Douglas Gregore7450f52009-03-24 19:52:54 +000010148 diag::err_field_incomplete)) {
10149 // Incomplete type
10150 FD->setInvalidDecl();
10151 EnclosingDecl->setInvalidDecl();
10152 continue;
Ted Kremenek6217b802009-07-29 21:53:49 +000010153 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) {
Reid Spencer5f016e22007-07-11 17:01:13 +000010154 if (FDTTy->getDecl()->hasFlexibleArrayMember()) {
10155 // If this is a member of a union, then entire union becomes "flexible".
Argyrios Kyrtzidis39ba4ae2008-06-09 23:19:58 +000010156 if (Record && Record->isUnion()) {
Reid Spencer5f016e22007-07-11 17:01:13 +000010157 Record->setHasFlexibleArrayMember(true);
10158 } else {
10159 // If this is a struct/class and this is not the last element, reject
10160 // it. Note that GCC supports variable sized arrays in the middle of
10161 // structures.
David Blaikie77b6de02011-09-22 02:58:26 +000010162 if (i + 1 != Fields.end())
Douglas Gregore4f3e062009-03-06 23:41:27 +000010163 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct)
Chris Lattner740782a2009-04-25 18:52:45 +000010164 << FD->getDeclName() << FD->getType();
Douglas Gregore4f3e062009-03-06 23:41:27 +000010165 else {
10166 // We support flexible arrays at the end of structs in
10167 // other structs as an extension.
10168 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct)
10169 << FD->getDeclName();
10170 if (Record)
10171 Record->setHasFlexibleArrayMember(true);
Reid Spencer5f016e22007-07-11 17:01:13 +000010172 }
Reid Spencer5f016e22007-07-11 17:01:13 +000010173 }
10174 }
Fariborz Jahanian7f90b532012-08-16 22:38:41 +000010175 if (isa<ObjCContainerDecl>(EnclosingDecl) &&
10176 RequireNonAbstractType(FD->getLocation(), FD->getType(),
10177 diag::err_abstract_type_in_decl,
10178 AbstractIvarType)) {
10179 // Ivars can not have abstract class types
10180 FD->setInvalidDecl();
10181 }
Fariborz Jahanian082b02e2009-07-08 01:18:33 +000010182 if (Record && FDTTy->getDecl()->hasObjectMember())
10183 Record->setHasObjectMember(true);
John McCallc12c5bb2010-05-15 11:32:37 +000010184 } else if (FDTy->isObjCObjectType()) {
Douglas Gregore7450f52009-03-24 19:52:54 +000010185 /// A field cannot be an Objective-c object
Fariborz Jahanian8eaefdc2011-07-26 17:58:54 +000010186 Diag(FD->getLocation(), diag::err_statically_allocated_object)
10187 << FixItHint::CreateInsertion(FD->getLocation(), "*");
10188 QualType T = Context.getObjCObjectPointerType(FD->getType());
10189 FD->setType(T);
Fariborz Jahanian7f90b532012-08-16 22:38:41 +000010190 } else if (!getLangOpts().CPlusPlus) {
David Blaikie4e4d0842012-03-11 07:00:24 +000010191 if (getLangOpts().ObjCAutoRefCount && Record && !ARCErrReported) {
John McCallf85e1932011-06-15 23:02:42 +000010192 // It's an error in ARC if a field has lifetime.
10193 // We don't want to report this in a system header, though,
10194 // so we just make the field unavailable.
10195 // FIXME: that's really not sufficient; we need to make the type
10196 // itself invalid to, say, initialize or copy.
10197 QualType T = FD->getType();
10198 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime();
10199 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) {
10200 SourceLocation loc = FD->getLocation();
10201 if (getSourceManager().isInSystemHeader(loc)) {
10202 if (!FD->hasAttr<UnavailableAttr>()) {
10203 FD->addAttr(new (Context) UnavailableAttr(loc, Context,
Argyrios Kyrtzidisb8b03132011-06-24 00:08:59 +000010204 "this system field has retaining ownership"));
John McCallf85e1932011-06-15 23:02:42 +000010205 }
10206 } else {
Fariborz Jahanianba96ffc2011-12-12 23:17:04 +000010207 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct)
10208 << T->isBlockPointerType();
John McCallf85e1932011-06-15 23:02:42 +000010209 }
10210 ARCErrReported = true;
10211 }
10212 }
David Blaikie4e4d0842012-03-11 07:00:24 +000010213 else if (getLangOpts().ObjC1 &&
10214 getLangOpts().getGC() != LangOptions::NonGC &&
John McCallf85e1932011-06-15 23:02:42 +000010215 Record && !Record->hasObjectMember()) {
10216 if (FD->getType()->isObjCObjectPointerType() ||
10217 FD->getType().isObjCGCStrong())
10218 Record->setHasObjectMember(true);
10219 else if (Context.getAsArrayType(FD->getType())) {
10220 QualType BaseType = Context.getBaseElementType(FD->getType());
10221 if (BaseType->isRecordType() &&
10222 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember())
10223 Record->setHasObjectMember(true);
10224 else if (BaseType->isObjCObjectPointerType() ||
10225 BaseType.isObjCGCStrong())
10226 Record->setHasObjectMember(true);
10227 }
10228 }
Fariborz Jahanian55bcace2010-06-15 22:44:06 +000010229 }
Reid Spencer5f016e22007-07-11 17:01:13 +000010230 // Keep track of the number of named members.
Douglas Gregor72de6672009-01-08 20:45:30 +000010231 if (FD->getIdentifier())
Reid Spencer5f016e22007-07-11 17:01:13 +000010232 ++NumNamedMembers;
Reid Spencer5f016e22007-07-11 17:01:13 +000010233 }
Sebastian Redl64b45f72009-01-05 20:52:13 +000010234
Reid Spencer5f016e22007-07-11 17:01:13 +000010235 // Okay, we successfully defined 'Record'.
Chris Lattnere1e79852008-02-06 00:51:33 +000010236 if (Record) {
Douglas Gregor7a39dd02010-09-29 00:15:42 +000010237 bool Completed = false;
10238 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) {
10239 if (!CXXRecord->isInvalidDecl()) {
10240 // Set access bits correctly on the directly-declared conversions.
Argyrios Kyrtzidis9d295432012-11-28 03:56:09 +000010241 for (CXXRecordDecl::conversion_iterator
10242 I = CXXRecord->conversion_begin(),
10243 E = CXXRecord->conversion_end(); I != E; ++I)
10244 I.setAccess((*I)->getAccess());
Douglas Gregor7a39dd02010-09-29 00:15:42 +000010245
10246 if (!CXXRecord->isDependentType()) {
Sebastian Redl0ee33912011-05-19 05:13:44 +000010247 // Adjust user-defined destructor exception spec.
David Blaikie4e4d0842012-03-11 07:00:24 +000010248 if (getLangOpts().CPlusPlus0x &&
Sebastian Redl0ee33912011-05-19 05:13:44 +000010249 CXXRecord->hasUserDeclaredDestructor())
10250 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor());
10251
Douglas Gregor7a39dd02010-09-29 00:15:42 +000010252 // Add any implicitly-declared members to this class.
10253 AddImplicitlyDeclaredMembersToClass(CXXRecord);
10254
10255 // If we have virtual base classes, we may end up finding multiple
10256 // final overriders for a given virtual function. Check for this
10257 // problem now.
10258 if (CXXRecord->getNumVBases()) {
10259 CXXFinalOverriderMap FinalOverriders;
10260 CXXRecord->getFinalOverriders(FinalOverriders);
10261
10262 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(),
10263 MEnd = FinalOverriders.end();
10264 M != MEnd; ++M) {
10265 for (OverridingMethods::iterator SO = M->second.begin(),
10266 SOEnd = M->second.end();
10267 SO != SOEnd; ++SO) {
10268 assert(SO->second.size() > 0 &&
10269 "Virtual function without overridding functions?");
10270 if (SO->second.size() == 1)
10271 continue;
10272
10273 // C++ [class.virtual]p2:
10274 // In a derived class, if a virtual member function of a base
10275 // class subobject has more than one final overrider the
10276 // program is ill-formed.
10277 Diag(Record->getLocation(), diag::err_multiple_final_overriders)
Roman Divacky31ba6132012-09-06 15:59:27 +000010278 << (const NamedDecl *)M->first << Record;
Douglas Gregor7a39dd02010-09-29 00:15:42 +000010279 Diag(M->first->getLocation(),
10280 diag::note_overridden_virtual_function);
10281 for (OverridingMethods::overriding_iterator
10282 OM = SO->second.begin(),
10283 OMEnd = SO->second.end();
10284 OM != OMEnd; ++OM)
10285 Diag(OM->Method->getLocation(), diag::note_final_overrider)
Roman Divacky31ba6132012-09-06 15:59:27 +000010286 << (const NamedDecl *)M->first << OM->Method->getParent();
Douglas Gregor7a39dd02010-09-29 00:15:42 +000010287
10288 Record->setInvalidDecl();
10289 }
10290 }
10291 CXXRecord->completeDefinition(&FinalOverriders);
10292 Completed = true;
10293 }
10294 }
10295 }
10296 }
10297
10298 if (!Completed)
10299 Record->completeDefinition();
Sebastian Redl0ee33912011-05-19 05:13:44 +000010300
Chris Lattnere1e79852008-02-06 00:51:33 +000010301 } else {
Jay Foadbeaaccd2009-05-21 09:52:38 +000010302 ObjCIvarDecl **ClsFields =
10303 reinterpret_cast<ObjCIvarDecl**>(RecFields.data());
Fariborz Jahanian60f8c862008-12-13 20:28:25 +000010304 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) {
Douglas Gregor05c272f2011-12-15 22:34:59 +000010305 ID->setEndOfDefinitionLoc(RBrac);
Fariborz Jahanian496b5a82009-06-05 18:16:35 +000010306 // Add ivar's to class's DeclContext.
10307 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) {
10308 ClsFields[i]->setLexicalDeclContext(ID);
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +000010309 ID->addDecl(ClsFields[i]);
Fariborz Jahanian496b5a82009-06-05 18:16:35 +000010310 }
Fariborz Jahanian3281eff2008-12-16 01:08:35 +000010311 // Must enforce the rule that ivars in the base classes may not be
10312 // duplicates.
Fariborz Jahanianf914b972010-02-23 23:41:11 +000010313 if (ID->getSuperClass())
10314 DiagnoseDuplicateIvars(ID, ID->getSuperClass());
Mike Stump1eb44332009-09-09 15:08:12 +000010315 } else if (ObjCImplementationDecl *IMPDecl =
Chris Lattner1829a6d2009-02-23 22:00:08 +000010316 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) {
Ted Kremeneka526c5c2008-01-07 19:49:32 +000010317 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl");
Fariborz Jahanian496b5a82009-06-05 18:16:35 +000010318 for (unsigned I = 0, N = RecFields.size(); I != N; ++I)
10319 // Ivar declared in @implementation never belongs to the implementation.
10320 // Only it is in implementation's lexical context.
Douglas Gregor8f36aba2009-04-23 03:23:08 +000010321 ClsFields[I]->setLexicalDeclContext(IMPDecl);
Fariborz Jahanian3a3ca1b2007-10-31 18:48:14 +000010322 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac);
Fariborz Jahanianaf300292012-02-20 20:09:20 +000010323 IMPDecl->setIvarLBraceLoc(LBrac);
10324 IMPDecl->setIvarRBraceLoc(RBrac);
Fariborz Jahanian83c481a2010-02-22 23:04:20 +000010325 } else if (ObjCCategoryDecl *CDecl =
10326 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) {
Fariborz Jahanian0bd04592010-04-06 22:43:48 +000010327 // case of ivars in class extension; all other cases have been
10328 // reported as errors elsewhere.
10329 // FIXME. Class extension does not have a LocEnd field.
10330 // CDecl->setLocEnd(RBrac);
10331 // Add ivar's to class extension's DeclContext.
Fariborz Jahanian3ff86f72011-10-21 18:03:52 +000010332 // Diagnose redeclaration of private ivars.
10333 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface();
Fariborz Jahanian0bd04592010-04-06 22:43:48 +000010334 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) {
Fariborz Jahanian3ff86f72011-10-21 18:03:52 +000010335 if (IDecl) {
10336 if (const ObjCIvarDecl *ClsIvar =
10337 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) {
10338 Diag(ClsFields[i]->getLocation(),
10339 diag::err_duplicate_ivar_declaration);
10340 Diag(ClsIvar->getLocation(), diag::note_previous_definition);
10341 continue;
10342 }
10343 for (const ObjCCategoryDecl *ClsExtDecl =
10344 IDecl->getFirstClassExtension();
10345 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) {
10346 if (const ObjCIvarDecl *ClsExtIvar =
10347 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) {
10348 Diag(ClsFields[i]->getLocation(),
10349 diag::err_duplicate_ivar_declaration);
10350 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition);
10351 continue;
10352 }
10353 }
10354 }
Fariborz Jahanian0bd04592010-04-06 22:43:48 +000010355 ClsFields[i]->setLexicalDeclContext(CDecl);
10356 CDecl->addDecl(ClsFields[i]);
Fariborz Jahanian83c481a2010-02-22 23:04:20 +000010357 }
Fariborz Jahanianaf300292012-02-20 20:09:20 +000010358 CDecl->setIvarLBraceLoc(LBrac);
10359 CDecl->setIvarRBraceLoc(RBrac);
Fariborz Jahaniand0b90bf2007-09-26 18:27:25 +000010360 }
Fariborz Jahanianb04a0212007-09-14 21:08:27 +000010361 }
Daniel Dunbar7d076642008-10-03 17:33:35 +000010362
10363 if (Attr)
Douglas Gregor9cdda0c2009-06-17 21:51:59 +000010364 ProcessDeclAttributeList(S, Record, Attr);
Reid Spencer5f016e22007-07-11 17:01:13 +000010365}
10366
Douglas Gregor677e4fe2010-02-01 23:36:03 +000010367/// \brief Determine whether the given integral value is representable within
10368/// the given type T.
10369static bool isRepresentableIntegerValue(ASTContext &Context,
10370 llvm::APSInt &Value,
10371 QualType T) {
Douglas Gregor9d3347a2010-06-16 00:35:25 +000010372 assert(T->isIntegralType(Context) && "Integral type required!");
Douglas Gregoraf68d4e2010-04-15 15:53:31 +000010373 unsigned BitWidth = Context.getIntWidth(T);
Douglas Gregor677e4fe2010-02-01 23:36:03 +000010374
Douglas Gregor1274ccd2010-10-08 23:50:27 +000010375 if (Value.isUnsigned() || Value.isNonNegative()) {
Douglas Gregor575a1c92011-05-20 16:38:50 +000010376 if (T->isSignedIntegerOrEnumerationType())
Douglas Gregor1274ccd2010-10-08 23:50:27 +000010377 --BitWidth;
10378 return Value.getActiveBits() <= BitWidth;
10379 }
Douglas Gregor677e4fe2010-02-01 23:36:03 +000010380 return Value.getMinSignedBits() <= BitWidth;
10381}
10382
10383// \brief Given an integral type, return the next larger integral type
10384// (or a NULL type of no such type exists).
10385static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) {
10386 // FIXME: Int128/UInt128 support, which also needs to be introduced into
10387 // enum checking below.
Douglas Gregor9d3347a2010-06-16 00:35:25 +000010388 assert(T->isIntegralType(Context) && "Integral type required!");
Douglas Gregor677e4fe2010-02-01 23:36:03 +000010389 const unsigned NumTypes = 4;
10390 QualType SignedIntegralTypes[NumTypes] = {
10391 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy
10392 };
10393 QualType UnsignedIntegralTypes[NumTypes] = {
10394 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy,
10395 Context.UnsignedLongLongTy
10396 };
10397
10398 unsigned BitWidth = Context.getTypeSize(T);
Douglas Gregor575a1c92011-05-20 16:38:50 +000010399 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes
10400 : UnsignedIntegralTypes;
Douglas Gregor677e4fe2010-02-01 23:36:03 +000010401 for (unsigned I = 0; I != NumTypes; ++I)
10402 if (Context.getTypeSize(Types[I]) > BitWidth)
10403 return Types[I];
10404
10405 return QualType();
10406}
10407
Douglas Gregor879fd492009-03-17 19:05:46 +000010408EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum,
10409 EnumConstantDecl *LastEnumConst,
10410 SourceLocation IdLoc,
10411 IdentifierInfo *Id,
John McCall9ae2f072010-08-23 23:25:46 +000010412 Expr *Val) {
Douglas Gregorbcfd1f52011-09-02 00:18:52 +000010413 unsigned IntWidth = Context.getTargetInfo().getIntWidth();
Douglas Gregor677e4fe2010-02-01 23:36:03 +000010414 llvm::APSInt EnumVal(IntWidth);
Douglas Gregor879fd492009-03-17 19:05:46 +000010415 QualType EltTy;
Douglas Gregor0c9e4792010-12-16 00:24:44 +000010416
10417 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue))
10418 Val = 0;
10419
Eli Friedman19efa3e2011-12-06 00:10:34 +000010420 if (Val)
10421 Val = DefaultLvalueConversion(Val).take();
10422
Douglas Gregor4912c342009-11-06 00:03:12 +000010423 if (Val) {
Douglas Gregor9b9edd62010-03-02 17:53:14 +000010424 if (Enum->isDependentType() || Val->isTypeDependent())
Douglas Gregor4912c342009-11-06 00:03:12 +000010425 EltTy = Context.DependentTy;
10426 else {
Douglas Gregor4912c342009-11-06 00:03:12 +000010427 SourceLocation ExpLoc;
David Blaikie4e4d0842012-03-11 07:00:24 +000010428 if (getLangOpts().CPlusPlus0x && Enum->isFixed() &&
10429 !getLangOpts().MicrosoftMode) {
Richard Smith8ef7b202012-01-18 23:55:52 +000010430 // C++11 [dcl.enum]p5: If the underlying type is fixed, [...] the
10431 // constant-expression in the enumerator-definition shall be a converted
10432 // constant expression of the underlying type.
10433 EltTy = Enum->getIntegerType();
10434 ExprResult Converted =
10435 CheckConvertedConstantExpression(Val, EltTy, EnumVal,
10436 CCEK_Enumerator);
10437 if (Converted.isInvalid())
10438 Val = 0;
10439 else
10440 Val = Converted.take();
10441 } else if (!Val->isValueDependent() &&
Richard Smith282e7e62012-02-04 09:53:13 +000010442 !(Val = VerifyIntegerConstantExpression(Val,
10443 &EnumVal).take())) {
Richard Smith8ef7b202012-01-18 23:55:52 +000010444 // C99 6.7.2.2p2: Make sure we have an integer constant expression.
Richard Smith8ef7b202012-01-18 23:55:52 +000010445 } else {
Douglas Gregor1274ccd2010-10-08 23:50:27 +000010446 if (Enum->isFixed()) {
10447 EltTy = Enum->getIntegerType();
10448
Richard Smith8ef7b202012-01-18 23:55:52 +000010449 // In Obj-C and Microsoft mode, require the enumeration value to be
10450 // representable in the underlying type of the enumeration. In C++11,
10451 // we perform a non-narrowing conversion as part of converted constant
10452 // expression checking.
Francois Pichet842e7a22010-10-18 15:01:13 +000010453 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) {
David Blaikie4e4d0842012-03-11 07:00:24 +000010454 if (getLangOpts().MicrosoftMode) {
Francois Pichet842e7a22010-10-18 15:01:13 +000010455 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy;
John Wiegley429bb272011-04-08 18:41:53 +000010456 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take();
Richard Smith8ef7b202012-01-18 23:55:52 +000010457 } else
10458 Diag(IdLoc, diag::err_enumerator_too_large) << EltTy;
Francois Pichet842e7a22010-10-18 15:01:13 +000010459 } else
John Wiegley429bb272011-04-08 18:41:53 +000010460 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take();
David Blaikie4e4d0842012-03-11 07:00:24 +000010461 } else if (getLangOpts().CPlusPlus) {
Richard Smith8ef7b202012-01-18 23:55:52 +000010462 // C++11 [dcl.enum]p5:
Douglas Gregor1274ccd2010-10-08 23:50:27 +000010463 // If the underlying type is not fixed, the type of each enumerator
10464 // is the type of its initializing value:
10465 // - If an initializer is specified for an enumerator, the
10466 // initializing value has the same type as the expression.
10467 EltTy = Val->getType();
Eli Friedman04ca2522012-02-07 04:34:38 +000010468 } else {
10469 // C99 6.7.2.2p2:
10470 // The expression that defines the value of an enumeration constant
10471 // shall be an integer constant expression that has a value
10472 // representable as an int.
10473
10474 // Complain if the value is not representable in an int.
10475 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy))
10476 Diag(IdLoc, diag::ext_enum_value_not_int)
10477 << EnumVal.toString(10) << Val->getSourceRange()
10478 << (EnumVal.isUnsigned() || EnumVal.isNonNegative());
10479 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) {
10480 // Force the type of the expression to 'int'.
10481 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take();
10482 }
10483 EltTy = Val->getType();
Douglas Gregor1274ccd2010-10-08 23:50:27 +000010484 }
Douglas Gregor4912c342009-11-06 00:03:12 +000010485 }
Douglas Gregor879fd492009-03-17 19:05:46 +000010486 }
10487 }
Mike Stump1eb44332009-09-09 15:08:12 +000010488
Douglas Gregor879fd492009-03-17 19:05:46 +000010489 if (!Val) {
Eli Friedmaned0716b2009-12-11 01:34:50 +000010490 if (Enum->isDependentType())
10491 EltTy = Context.DependentTy;
Douglas Gregor677e4fe2010-02-01 23:36:03 +000010492 else if (!LastEnumConst) {
10493 // C++0x [dcl.enum]p5:
10494 // If the underlying type is not fixed, the type of each enumerator
10495 // is the type of its initializing value:
10496 // - If no initializer is specified for the first enumerator, the
10497 // initializing value has an unspecified integral type.
10498 //
10499 // GCC uses 'int' for its unspecified integral type, as does
10500 // C99 6.7.2.2p3.
Douglas Gregor1274ccd2010-10-08 23:50:27 +000010501 if (Enum->isFixed()) {
10502 EltTy = Enum->getIntegerType();
10503 }
10504 else {
10505 EltTy = Context.IntTy;
10506 }
Douglas Gregor677e4fe2010-02-01 23:36:03 +000010507 } else {
Douglas Gregor879fd492009-03-17 19:05:46 +000010508 // Assign the last value + 1.
10509 EnumVal = LastEnumConst->getInitVal();
10510 ++EnumVal;
Douglas Gregor677e4fe2010-02-01 23:36:03 +000010511 EltTy = LastEnumConst->getType();
Douglas Gregor879fd492009-03-17 19:05:46 +000010512
10513 // Check for overflow on increment.
Douglas Gregor677e4fe2010-02-01 23:36:03 +000010514 if (EnumVal < LastEnumConst->getInitVal()) {
10515 // C++0x [dcl.enum]p5:
10516 // If the underlying type is not fixed, the type of each enumerator
10517 // is the type of its initializing value:
10518 //
10519 // - Otherwise the type of the initializing value is the same as
10520 // the type of the initializing value of the preceding enumerator
10521 // unless the incremented value is not representable in that type,
10522 // in which case the type is an unspecified integral type
10523 // sufficient to contain the incremented value. If no such type
10524 // exists, the program is ill-formed.
10525 QualType T = getNextLargerIntegralType(Context, EltTy);
Douglas Gregor1274ccd2010-10-08 23:50:27 +000010526 if (T.isNull() || Enum->isFixed()) {
Douglas Gregor677e4fe2010-02-01 23:36:03 +000010527 // There is no integral type larger enough to represent this
10528 // value. Complain, then allow the value to wrap around.
10529 EnumVal = LastEnumConst->getInitVal();
Jay Foad9f71a8f2010-12-07 08:25:34 +000010530 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2);
Douglas Gregor1274ccd2010-10-08 23:50:27 +000010531 ++EnumVal;
10532 if (Enum->isFixed())
10533 // When the underlying type is fixed, this is ill-formed.
10534 Diag(IdLoc, diag::err_enumerator_wrapped)
10535 << EnumVal.toString(10)
10536 << EltTy;
10537 else
10538 Diag(IdLoc, diag::warn_enumerator_too_large)
10539 << EnumVal.toString(10);
Douglas Gregor677e4fe2010-02-01 23:36:03 +000010540 } else {
10541 EltTy = T;
10542 }
10543
10544 // Retrieve the last enumerator's value, extent that type to the
10545 // type that is supposed to be large enough to represent the incremented
10546 // value, then increment.
10547 EnumVal = LastEnumConst->getInitVal();
Douglas Gregor575a1c92011-05-20 16:38:50 +000010548 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType());
Jay Foad9f71a8f2010-12-07 08:25:34 +000010549 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy));
Douglas Gregor677e4fe2010-02-01 23:36:03 +000010550 ++EnumVal;
10551
10552 // If we're not in C++, diagnose the overflow of enumerator values,
10553 // which in C99 means that the enumerator value is not representable in
10554 // an int (C99 6.7.2.2p2). However, we support GCC's extension that
10555 // permits enumerator values that are representable in some larger
10556 // integral type.
David Blaikie4e4d0842012-03-11 07:00:24 +000010557 if (!getLangOpts().CPlusPlus && !T.isNull())
Douglas Gregor677e4fe2010-02-01 23:36:03 +000010558 Diag(IdLoc, diag::warn_enum_value_overflow);
David Blaikie4e4d0842012-03-11 07:00:24 +000010559 } else if (!getLangOpts().CPlusPlus &&
Douglas Gregor677e4fe2010-02-01 23:36:03 +000010560 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) {
10561 // Enforce C99 6.7.2.2p2 even when we compute the next value.
10562 Diag(IdLoc, diag::ext_enum_value_not_int)
10563 << EnumVal.toString(10) << 1;
10564 }
Douglas Gregor879fd492009-03-17 19:05:46 +000010565 }
10566 }
Mike Stump1eb44332009-09-09 15:08:12 +000010567
Douglas Gregor9b9edd62010-03-02 17:53:14 +000010568 if (!EltTy->isDependentType()) {
Douglas Gregor677e4fe2010-02-01 23:36:03 +000010569 // Make the enumerator value match the signedness and size of the
10570 // enumerator's type.
Eli Friedman04ca2522012-02-07 04:34:38 +000010571 EnumVal = EnumVal.extOrTrunc(Context.getIntWidth(EltTy));
Douglas Gregor575a1c92011-05-20 16:38:50 +000010572 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType());
Douglas Gregor677e4fe2010-02-01 23:36:03 +000010573 }
Douglas Gregor4912c342009-11-06 00:03:12 +000010574
Douglas Gregor879fd492009-03-17 19:05:46 +000010575 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy,
Mike Stump1eb44332009-09-09 15:08:12 +000010576 Val, EnumVal);
Douglas Gregor879fd492009-03-17 19:05:46 +000010577}
10578
10579
John McCall5b629aa2010-10-22 23:36:17 +000010580Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst,
10581 SourceLocation IdLoc, IdentifierInfo *Id,
10582 AttributeList *Attr,
Richard Smith8ef7b202012-01-18 23:55:52 +000010583 SourceLocation EqualLoc, Expr *Val) {
John McCalld226f652010-08-21 09:40:31 +000010584 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl);
Reid Spencer5f016e22007-07-11 17:01:13 +000010585 EnumConstantDecl *LastEnumConst =
John McCalld226f652010-08-21 09:40:31 +000010586 cast_or_null<EnumConstantDecl>(lastEnumConst);
Reid Spencer5f016e22007-07-11 17:01:13 +000010587
Chris Lattner31e05722007-08-26 06:24:45 +000010588 // The scope passed in may not be a decl scope. Zip up the scope tree until
10589 // we find one that is.
Douglas Gregor1a0d31a2009-01-12 18:45:55 +000010590 S = getNonFieldDeclScope(S);
Mike Stump1eb44332009-09-09 15:08:12 +000010591
Reid Spencer5f016e22007-07-11 17:01:13 +000010592 // Verify that there isn't already something declared with this name in this
10593 // scope.
Douglas Gregorc83c6872010-04-15 22:33:43 +000010594 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName,
Douglas Gregore39fe722010-01-19 06:06:57 +000010595 ForRedeclaration);
Douglas Gregorf57172b2008-12-08 18:40:42 +000010596 if (PrevDecl && PrevDecl->isTemplateParameter()) {
Douglas Gregor72c3f312008-12-05 18:15:24 +000010597 // Maybe we will complain about the shadowed template parameter.
10598 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl);
10599 // Just pretend that we didn't see the previous declaration.
10600 PrevDecl = 0;
10601 }
10602
10603 if (PrevDecl) {
Argyrios Kyrtzidis0ff12f02008-07-16 21:01:53 +000010604 // When in C++, we may get a TagDecl with the same name; in this case the
10605 // enum constant will 'hide' the tag.
David Blaikie4e4d0842012-03-11 07:00:24 +000010606 assert((getLangOpts().CPlusPlus || !isa<TagDecl>(PrevDecl)) &&
Argyrios Kyrtzidis0ff12f02008-07-16 21:01:53 +000010607 "Received TagDecl when not in C++!");
Argyrios Kyrtzidis15a12d02008-09-09 21:18:04 +000010608 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) {
Reid Spencer5f016e22007-07-11 17:01:13 +000010609 if (isa<EnumConstantDecl>(PrevDecl))
Chris Lattner3c73c412008-11-19 08:23:25 +000010610 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id;
Reid Spencer5f016e22007-07-11 17:01:13 +000010611 else
Chris Lattner3c73c412008-11-19 08:23:25 +000010612 Diag(IdLoc, diag::err_redefinition) << Id;
Chris Lattner5f4a6822008-11-23 23:12:31 +000010613 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
John McCalld226f652010-08-21 09:40:31 +000010614 return 0;
Reid Spencer5f016e22007-07-11 17:01:13 +000010615 }
10616 }
10617
Aaron Ballmanf8167872012-07-19 03:12:23 +000010618 // C++ [class.mem]p15:
10619 // If T is the name of a class, then each of the following shall have a name
10620 // different from T:
10621 // - every enumerator of every member of class T that is an unscoped
10622 // enumerated type
Douglas Gregora6e937c2010-10-15 13:21:21 +000010623 if (CXXRecordDecl *Record
10624 = dyn_cast<CXXRecordDecl>(
10625 TheEnumDecl->getDeclContext()->getRedeclContext()))
Aaron Ballmanf8167872012-07-19 03:12:23 +000010626 if (!TheEnumDecl->isScoped() &&
10627 Record->getIdentifier() && Record->getIdentifier() == Id)
Douglas Gregora6e937c2010-10-15 13:21:21 +000010628 Diag(IdLoc, diag::err_member_name_of_class) << Id;
10629
John McCall5b629aa2010-10-22 23:36:17 +000010630 EnumConstantDecl *New =
10631 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val);
Chris Lattner421a23d2007-08-27 21:16:18 +000010632
John McCall92f88312010-01-23 00:46:32 +000010633 if (New) {
John McCall5b629aa2010-10-22 23:36:17 +000010634 // Process attributes.
10635 if (Attr) ProcessDeclAttributeList(S, New, Attr);
10636
10637 // Register this decl in the current scope stack.
John McCall92f88312010-01-23 00:46:32 +000010638 New->setAccess(TheEnumDecl->getAccess());
Douglas Gregor879fd492009-03-17 19:05:46 +000010639 PushOnScopeChains(New, S);
John McCall92f88312010-01-23 00:46:32 +000010640 }
Douglas Gregor45579f52008-12-17 02:04:30 +000010641
Dmitri Gribenkoa5ef44f2012-07-11 21:38:39 +000010642 ActOnDocumentableDecl(New);
10643
John McCalld226f652010-08-21 09:40:31 +000010644 return New;
Reid Spencer5f016e22007-07-11 17:01:13 +000010645}
10646
Ted Kremeneka734a0e2012-12-22 01:34:09 +000010647// Returns true when the enum initial expression does not trigger the
10648// duplicate enum warning. A few common cases are exempted as follows:
10649// Element2 = Element1
10650// Element2 = Element1 + 1
10651// Element2 = Element1 - 1
10652// Where Element2 and Element1 are from the same enum.
10653static bool ValidDuplicateEnum(EnumConstantDecl *ECD, EnumDecl *Enum) {
10654 Expr *InitExpr = ECD->getInitExpr();
10655 if (!InitExpr)
10656 return true;
10657 InitExpr = InitExpr->IgnoreImpCasts();
10658
10659 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(InitExpr)) {
10660 if (!BO->isAdditiveOp())
10661 return true;
10662 IntegerLiteral *IL = dyn_cast<IntegerLiteral>(BO->getRHS());
10663 if (!IL)
10664 return true;
10665 if (IL->getValue() != 1)
10666 return true;
10667
10668 InitExpr = BO->getLHS();
10669 }
10670
10671 // This checks if the elements are from the same enum.
10672 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(InitExpr);
10673 if (!DRE)
10674 return true;
10675
10676 EnumConstantDecl *EnumConstant = dyn_cast<EnumConstantDecl>(DRE->getDecl());
10677 if (!EnumConstant)
10678 return true;
10679
10680 if (cast<EnumDecl>(TagDecl::castFromDeclContext(ECD->getDeclContext())) !=
10681 Enum)
10682 return true;
10683
10684 return false;
10685}
10686
10687struct DupKey {
10688 int64_t val;
10689 bool isTombstoneOrEmptyKey;
10690 DupKey(int64_t val, bool isTombstoneOrEmptyKey)
10691 : val(val), isTombstoneOrEmptyKey(isTombstoneOrEmptyKey) {}
10692};
10693
10694static DupKey GetDupKey(const llvm::APSInt& Val) {
10695 return DupKey(Val.isSigned() ? Val.getSExtValue() : Val.getZExtValue(),
10696 false);
10697}
10698
10699struct DenseMapInfoDupKey {
10700 static DupKey getEmptyKey() { return DupKey(0, true); }
10701 static DupKey getTombstoneKey() { return DupKey(1, true); }
10702 static unsigned getHashValue(const DupKey Key) {
10703 return (unsigned)(Key.val * 37);
10704 }
10705 static bool isEqual(const DupKey& LHS, const DupKey& RHS) {
10706 return LHS.isTombstoneOrEmptyKey == RHS.isTombstoneOrEmptyKey &&
10707 LHS.val == RHS.val;
10708 }
10709};
10710
10711// Emits a warning when an element is implicitly set a value that
10712// a previous element has already been set to.
10713static void CheckForDuplicateEnumValues(Sema &S, Decl **Elements,
10714 unsigned NumElements, EnumDecl *Enum,
10715 QualType EnumType) {
10716 if (S.Diags.getDiagnosticLevel(diag::warn_duplicate_enum_values,
10717 Enum->getLocation()) ==
10718 DiagnosticsEngine::Ignored)
10719 return;
10720 // Avoid anonymous enums
10721 if (!Enum->getIdentifier())
10722 return;
10723
10724 // Only check for small enums.
10725 if (Enum->getNumPositiveBits() > 63 || Enum->getNumNegativeBits() > 64)
10726 return;
10727
10728 typedef llvm::SmallVector<EnumConstantDecl*, 3> ECDVector;
10729 typedef llvm::SmallVector<ECDVector*, 3> DuplicatesVector;
10730
10731 typedef llvm::PointerUnion<EnumConstantDecl*, ECDVector*> DeclOrVector;
10732 typedef llvm::DenseMap<DupKey, DeclOrVector, DenseMapInfoDupKey>
10733 ValueToVectorMap;
10734
10735 DuplicatesVector DupVector;
10736 ValueToVectorMap EnumMap;
10737
10738 // Populate the EnumMap with all values represented by enum constants without
10739 // an initialier.
10740 for (unsigned i = 0; i < NumElements; ++i) {
10741 EnumConstantDecl *ECD = cast<EnumConstantDecl>(Elements[i]);
10742
10743 // Null EnumConstantDecl means a previous diagnostic has been emitted for
10744 // this constant. Skip this enum since it may be ill-formed.
10745 if (!ECD) {
10746 return;
10747 }
10748
10749 if (ECD->getInitExpr())
10750 continue;
10751
10752 DupKey Key = GetDupKey(ECD->getInitVal());
10753 DeclOrVector &Entry = EnumMap[Key];
10754
10755 // First time encountering this value.
10756 if (Entry.isNull())
10757 Entry = ECD;
10758 }
10759
10760 // Create vectors for any values that has duplicates.
10761 for (unsigned i = 0; i < NumElements; ++i) {
10762 EnumConstantDecl *ECD = cast<EnumConstantDecl>(Elements[i]);
10763 if (!ValidDuplicateEnum(ECD, Enum))
10764 continue;
10765
10766 DupKey Key = GetDupKey(ECD->getInitVal());
10767
10768 DeclOrVector& Entry = EnumMap[Key];
10769 if (Entry.isNull())
10770 continue;
10771
10772 if (EnumConstantDecl *D = Entry.dyn_cast<EnumConstantDecl*>()) {
10773 // Ensure constants are different.
10774 if (D == ECD)
10775 continue;
10776
10777 // Create new vector and push values onto it.
10778 ECDVector *Vec = new ECDVector();
10779 Vec->push_back(D);
10780 Vec->push_back(ECD);
10781
10782 // Update entry to point to the duplicates vector.
10783 Entry = Vec;
10784
10785 // Store the vector somewhere we can consult later for quick emission of
10786 // diagnostics.
10787 DupVector.push_back(Vec);
10788 continue;
10789 }
10790
10791 ECDVector *Vec = Entry.get<ECDVector*>();
10792 // Make sure constants are not added more than once.
10793 if (*Vec->begin() == ECD)
10794 continue;
10795
10796 Vec->push_back(ECD);
10797 }
10798
10799 // Emit diagnostics.
10800 for (DuplicatesVector::iterator DupVectorIter = DupVector.begin(),
10801 DupVectorEnd = DupVector.end();
10802 DupVectorIter != DupVectorEnd; ++DupVectorIter) {
10803 ECDVector *Vec = *DupVectorIter;
10804 assert(Vec->size() > 1 && "ECDVector should have at least 2 elements.");
10805
10806 // Emit warning for one enum constant.
10807 ECDVector::iterator I = Vec->begin();
10808 S.Diag((*I)->getLocation(), diag::warn_duplicate_enum_values)
10809 << (*I)->getName() << (*I)->getInitVal().toString(10)
10810 << (*I)->getSourceRange();
10811 ++I;
10812
10813 // Emit one note for each of the remaining enum constants with
10814 // the same value.
10815 for (ECDVector::iterator E = Vec->end(); I != E; ++I)
10816 S.Diag((*I)->getLocation(), diag::note_duplicate_element)
10817 << (*I)->getName() << (*I)->getInitVal().toString(10)
10818 << (*I)->getSourceRange();
10819 delete Vec;
10820 }
10821}
10822
Mike Stumpc6e35aa2009-05-16 07:06:02 +000010823void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc,
John McCalld226f652010-08-21 09:40:31 +000010824 SourceLocation RBraceLoc, Decl *EnumDeclX,
10825 Decl **Elements, unsigned NumElements,
Edward O'Callaghanfee13812009-08-08 14:36:57 +000010826 Scope *S, AttributeList *Attr) {
John McCalld226f652010-08-21 09:40:31 +000010827 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX);
Douglas Gregor074149e2009-01-05 19:45:36 +000010828 QualType EnumType = Context.getTypeDeclType(Enum);
Edward O'Callaghanfee13812009-08-08 14:36:57 +000010829
10830 if (Attr)
10831 ProcessDeclAttributeList(S, Enum, Attr);
Mike Stump1eb44332009-09-09 15:08:12 +000010832
Eli Friedmaned0716b2009-12-11 01:34:50 +000010833 if (Enum->isDependentType()) {
10834 for (unsigned i = 0; i != NumElements; ++i) {
10835 EnumConstantDecl *ECD =
John McCalld226f652010-08-21 09:40:31 +000010836 cast_or_null<EnumConstantDecl>(Elements[i]);
Eli Friedmaned0716b2009-12-11 01:34:50 +000010837 if (!ECD) continue;
10838
10839 ECD->setType(EnumType);
10840 }
10841
John McCall1b5a6182010-05-06 08:49:23 +000010842 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0);
Eli Friedmaned0716b2009-12-11 01:34:50 +000010843 return;
10844 }
10845
Chris Lattnere37f0be2007-08-28 05:10:31 +000010846 // TODO: If the result value doesn't fit in an int, it must be a long or long
10847 // long value. ISO C does not support this, but GCC does as an extension,
10848 // emit a warning.
Douglas Gregorbcfd1f52011-09-02 00:18:52 +000010849 unsigned IntWidth = Context.getTargetInfo().getIntWidth();
10850 unsigned CharWidth = Context.getTargetInfo().getCharWidth();
10851 unsigned ShortWidth = Context.getTargetInfo().getShortWidth();
Mike Stump1eb44332009-09-09 15:08:12 +000010852
Chris Lattnerac609682007-08-28 06:15:15 +000010853 // Verify that all the values are okay, compute the size of the values, and
10854 // reverse the list.
10855 unsigned NumNegativeBits = 0;
10856 unsigned NumPositiveBits = 0;
Mike Stump1eb44332009-09-09 15:08:12 +000010857
Chris Lattnerac609682007-08-28 06:15:15 +000010858 // Keep track of whether all elements have type int.
10859 bool AllElementsInt = true;
Mike Stump1eb44332009-09-09 15:08:12 +000010860
Reid Spencer5f016e22007-07-11 17:01:13 +000010861 for (unsigned i = 0; i != NumElements; ++i) {
10862 EnumConstantDecl *ECD =
John McCalld226f652010-08-21 09:40:31 +000010863 cast_or_null<EnumConstantDecl>(Elements[i]);
Reid Spencer5f016e22007-07-11 17:01:13 +000010864 if (!ECD) continue; // Already issued a diagnostic.
Mike Stump1eb44332009-09-09 15:08:12 +000010865
Chris Lattner211a30e2007-08-28 05:27:00 +000010866 const llvm::APSInt &InitVal = ECD->getInitVal();
Mike Stump1eb44332009-09-09 15:08:12 +000010867
Chris Lattnerac609682007-08-28 06:15:15 +000010868 // Keep track of the size of positive and negative values.
Chris Lattnera73349d2008-02-26 00:33:57 +000010869 if (InitVal.isUnsigned() || InitVal.isNonNegative())
Chris Lattner21dd8212008-01-14 21:47:29 +000010870 NumPositiveBits = std::max(NumPositiveBits,
10871 (unsigned)InitVal.getActiveBits());
Chris Lattnerac609682007-08-28 06:15:15 +000010872 else
Chris Lattner21dd8212008-01-14 21:47:29 +000010873 NumNegativeBits = std::max(NumNegativeBits,
10874 (unsigned)InitVal.getMinSignedBits());
Reid Spencer5f016e22007-07-11 17:01:13 +000010875
Chris Lattnerac609682007-08-28 06:15:15 +000010876 // Keep track of whether every enum element has type int (very commmon).
10877 if (AllElementsInt)
Mike Stump1eb44332009-09-09 15:08:12 +000010878 AllElementsInt = ECD->getType() == Context.IntTy;
Reid Spencer5f016e22007-07-11 17:01:13 +000010879 }
Mike Stump1eb44332009-09-09 15:08:12 +000010880
Chris Lattnerac609682007-08-28 06:15:15 +000010881 // Figure out the type that should be used for this enum.
Chris Lattnerac609682007-08-28 06:15:15 +000010882 QualType BestType;
Chris Lattnerb7f6e082007-08-29 17:31:48 +000010883 unsigned BestWidth;
Edward O'Callaghanfee13812009-08-08 14:36:57 +000010884
John McCall842aef82009-12-09 09:09:27 +000010885 // C++0x N3000 [conv.prom]p3:
10886 // An rvalue of an unscoped enumeration type whose underlying
10887 // type is not fixed can be converted to an rvalue of the first
10888 // of the following types that can represent all the values of
10889 // the enumeration: int, unsigned int, long int, unsigned long
10890 // int, long long int, or unsigned long long int.
10891 // C99 6.4.4.3p2:
10892 // An identifier declared as an enumeration constant has type int.
10893 // The C99 rule is modified by a gcc extension
10894 QualType BestPromotionType;
10895
Edward O'Callaghanfee13812009-08-08 14:36:57 +000010896 bool Packed = Enum->getAttr<PackedAttr>() ? true : false;
Argyrios Kyrtzidis9a2b9d72010-10-08 00:25:19 +000010897 // -fshort-enums is the equivalent to specifying the packed attribute on all
10898 // enum definitions.
10899 if (LangOpts.ShortEnums)
10900 Packed = true;
Edward O'Callaghanfee13812009-08-08 14:36:57 +000010901
Douglas Gregor1274ccd2010-10-08 23:50:27 +000010902 if (Enum->isFixed()) {
Eli Friedman3bfb5712011-10-26 07:38:19 +000010903 BestType = Enum->getIntegerType();
10904 if (BestType->isPromotableIntegerType())
10905 BestPromotionType = Context.getPromotedIntegerType(BestType);
10906 else
10907 BestPromotionType = BestType;
Duncan Sands240a0202010-10-12 14:07:59 +000010908 // We don't need to set BestWidth, because BestType is going to be the type
10909 // of the enumerators, but we do anyway because otherwise some compilers
10910 // warn that it might be used uninitialized.
10911 BestWidth = CharWidth;
Douglas Gregor1274ccd2010-10-08 23:50:27 +000010912 }
10913 else if (NumNegativeBits) {
Mike Stump1eb44332009-09-09 15:08:12 +000010914 // If there is a negative value, figure out the smallest integer type (of
Chris Lattnerac609682007-08-28 06:15:15 +000010915 // int/long/longlong) that fits.
Edward O'Callaghanfee13812009-08-08 14:36:57 +000010916 // If it's packed, check also if it fits a char or a short.
10917 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) {
John McCall842aef82009-12-09 09:09:27 +000010918 BestType = Context.SignedCharTy;
10919 BestWidth = CharWidth;
Mike Stump1eb44332009-09-09 15:08:12 +000010920 } else if (Packed && NumNegativeBits <= ShortWidth &&
Edward O'Callaghanfee13812009-08-08 14:36:57 +000010921 NumPositiveBits < ShortWidth) {
John McCall842aef82009-12-09 09:09:27 +000010922 BestType = Context.ShortTy;
10923 BestWidth = ShortWidth;
10924 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) {
Chris Lattnerac609682007-08-28 06:15:15 +000010925 BestType = Context.IntTy;
Chris Lattnerb7f6e082007-08-29 17:31:48 +000010926 BestWidth = IntWidth;
10927 } else {
Douglas Gregorbcfd1f52011-09-02 00:18:52 +000010928 BestWidth = Context.getTargetInfo().getLongWidth();
Mike Stump1eb44332009-09-09 15:08:12 +000010929
John McCall842aef82009-12-09 09:09:27 +000010930 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) {
Chris Lattnerac609682007-08-28 06:15:15 +000010931 BestType = Context.LongTy;
John McCall842aef82009-12-09 09:09:27 +000010932 } else {
Douglas Gregorbcfd1f52011-09-02 00:18:52 +000010933 BestWidth = Context.getTargetInfo().getLongLongWidth();
Mike Stump1eb44332009-09-09 15:08:12 +000010934
Chris Lattnerb7f6e082007-08-29 17:31:48 +000010935 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth)
Chris Lattnerac609682007-08-28 06:15:15 +000010936 Diag(Enum->getLocation(), diag::warn_enum_too_large);
10937 BestType = Context.LongLongTy;
10938 }
10939 }
John McCall842aef82009-12-09 09:09:27 +000010940 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType);
Chris Lattnerac609682007-08-28 06:15:15 +000010941 } else {
Douglas Gregoraa74a1e2010-02-02 20:10:50 +000010942 // If there is no negative value, figure out the smallest type that fits
10943 // all of the enumerator values.
Edward O'Callaghanfee13812009-08-08 14:36:57 +000010944 // If it's packed, check also if it fits a char or a short.
10945 if (Packed && NumPositiveBits <= CharWidth) {
John McCall842aef82009-12-09 09:09:27 +000010946 BestType = Context.UnsignedCharTy;
10947 BestPromotionType = Context.IntTy;
10948 BestWidth = CharWidth;
Edward O'Callaghanfee13812009-08-08 14:36:57 +000010949 } else if (Packed && NumPositiveBits <= ShortWidth) {
John McCall842aef82009-12-09 09:09:27 +000010950 BestType = Context.UnsignedShortTy;
10951 BestPromotionType = Context.IntTy;
10952 BestWidth = ShortWidth;
10953 } else if (NumPositiveBits <= IntWidth) {
Chris Lattnerac609682007-08-28 06:15:15 +000010954 BestType = Context.UnsignedIntTy;
Chris Lattnerb7f6e082007-08-29 17:31:48 +000010955 BestWidth = IntWidth;
Douglas Gregoraa74a1e2010-02-02 20:10:50 +000010956 BestPromotionType
David Blaikie4e4d0842012-03-11 07:00:24 +000010957 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus)
Douglas Gregoraa74a1e2010-02-02 20:10:50 +000010958 ? Context.UnsignedIntTy : Context.IntTy;
Chris Lattnerb7f6e082007-08-29 17:31:48 +000010959 } else if (NumPositiveBits <=
Douglas Gregorbcfd1f52011-09-02 00:18:52 +000010960 (BestWidth = Context.getTargetInfo().getLongWidth())) {
Chris Lattnerac609682007-08-28 06:15:15 +000010961 BestType = Context.UnsignedLongTy;
Douglas Gregoraa74a1e2010-02-02 20:10:50 +000010962 BestPromotionType
David Blaikie4e4d0842012-03-11 07:00:24 +000010963 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus)
Douglas Gregoraa74a1e2010-02-02 20:10:50 +000010964 ? Context.UnsignedLongTy : Context.LongTy;
Chris Lattner98be4942008-03-05 18:54:05 +000010965 } else {
Douglas Gregorbcfd1f52011-09-02 00:18:52 +000010966 BestWidth = Context.getTargetInfo().getLongLongWidth();
Chris Lattnerb7f6e082007-08-29 17:31:48 +000010967 assert(NumPositiveBits <= BestWidth &&
Chris Lattnerac609682007-08-28 06:15:15 +000010968 "How could an initializer get larger than ULL?");
10969 BestType = Context.UnsignedLongLongTy;
Douglas Gregoraa74a1e2010-02-02 20:10:50 +000010970 BestPromotionType
David Blaikie4e4d0842012-03-11 07:00:24 +000010971 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus)
Douglas Gregoraa74a1e2010-02-02 20:10:50 +000010972 ? Context.UnsignedLongLongTy : Context.LongLongTy;
Chris Lattnerac609682007-08-28 06:15:15 +000010973 }
10974 }
Mike Stump1eb44332009-09-09 15:08:12 +000010975
Chris Lattnerb7f6e082007-08-29 17:31:48 +000010976 // Loop over all of the enumerator constants, changing their types to match
10977 // the type of the enum if needed.
10978 for (unsigned i = 0; i != NumElements; ++i) {
John McCalld226f652010-08-21 09:40:31 +000010979 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]);
Chris Lattnerb7f6e082007-08-29 17:31:48 +000010980 if (!ECD) continue; // Already issued a diagnostic.
10981
10982 // Standard C says the enumerators have int type, but we allow, as an
10983 // extension, the enumerators to be larger than int size. If each
10984 // enumerator value fits in an int, type it as an int, otherwise type it the
10985 // same as the enumerator decl itself. This means that in "enum { X = 1U }"
10986 // that X has type 'int', not 'unsigned'.
Chris Lattnerb7f6e082007-08-29 17:31:48 +000010987
10988 // Determine whether the value fits into an int.
10989 llvm::APSInt InitVal = ECD->getInitVal();
Chris Lattnerb7f6e082007-08-29 17:31:48 +000010990
10991 // If it fits into an integer type, force it. Otherwise force it to match
10992 // the enum decl type.
10993 QualType NewTy;
10994 unsigned NewWidth;
10995 bool NewSign;
David Blaikie4e4d0842012-03-11 07:00:24 +000010996 if (!getLangOpts().CPlusPlus &&
Fariborz Jahanian3b252162011-11-04 18:51:24 +000010997 !Enum->isFixed() &&
Douglas Gregor677e4fe2010-02-01 23:36:03 +000010998 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) {
Chris Lattnerb7f6e082007-08-29 17:31:48 +000010999 NewTy = Context.IntTy;
11000 NewWidth = IntWidth;
11001 NewSign = true;
11002 } else if (ECD->getType() == BestType) {
11003 // Already the right type!
David Blaikie4e4d0842012-03-11 07:00:24 +000011004 if (getLangOpts().CPlusPlus)
Douglas Gregorc9467cf2008-12-12 02:00:36 +000011005 // C++ [dcl.enum]p4: Following the closing brace of an
11006 // enum-specifier, each enumerator has the type of its
Mike Stump1eb44332009-09-09 15:08:12 +000011007 // enumeration.
Douglas Gregorc9467cf2008-12-12 02:00:36 +000011008 ECD->setType(EnumType);
Chris Lattnerb7f6e082007-08-29 17:31:48 +000011009 continue;
11010 } else {
11011 NewTy = BestType;
11012 NewWidth = BestWidth;
Douglas Gregor575a1c92011-05-20 16:38:50 +000011013 NewSign = BestType->isSignedIntegerOrEnumerationType();
Chris Lattnerb7f6e082007-08-29 17:31:48 +000011014 }
11015
11016 // Adjust the APSInt value.
Jay Foad9f71a8f2010-12-07 08:25:34 +000011017 InitVal = InitVal.extOrTrunc(NewWidth);
Chris Lattnerb7f6e082007-08-29 17:31:48 +000011018 InitVal.setIsSigned(NewSign);
11019 ECD->setInitVal(InitVal);
Mike Stump1eb44332009-09-09 15:08:12 +000011020
Chris Lattnerb7f6e082007-08-29 17:31:48 +000011021 // Adjust the Expr initializer and type.
Abramo Bagnara320e1532010-12-17 15:49:53 +000011022 if (ECD->getInitExpr() &&
Nick Lewycky25af0912011-07-02 02:05:12 +000011023 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType()))
John McCallf871d0c2010-08-07 06:22:56 +000011024 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy,
John McCall2de56d12010-08-25 11:45:40 +000011025 CK_IntegralCast,
John McCallf871d0c2010-08-07 06:22:56 +000011026 ECD->getInitExpr(),
11027 /*base paths*/ 0,
John McCall5baba9d2010-08-25 10:28:54 +000011028 VK_RValue));
David Blaikie4e4d0842012-03-11 07:00:24 +000011029 if (getLangOpts().CPlusPlus)
Douglas Gregorc9467cf2008-12-12 02:00:36 +000011030 // C++ [dcl.enum]p4: Following the closing brace of an
11031 // enum-specifier, each enumerator has the type of its
Mike Stump1eb44332009-09-09 15:08:12 +000011032 // enumeration.
Douglas Gregorc9467cf2008-12-12 02:00:36 +000011033 ECD->setType(EnumType);
11034 else
11035 ECD->setType(NewTy);
Chris Lattnerb7f6e082007-08-29 17:31:48 +000011036 }
Mike Stump1eb44332009-09-09 15:08:12 +000011037
John McCall1b5a6182010-05-06 08:49:23 +000011038 Enum->completeDefinition(BestType, BestPromotionType,
11039 NumPositiveBits, NumNegativeBits);
James Molloy16f1f712012-02-29 10:24:19 +000011040
11041 // If we're declaring a function, ensure this decl isn't forgotten about -
11042 // it needs to go into the function scope.
11043 if (InFunctionDeclarator)
11044 DeclsInPrototypeScope.push_back(Enum);
Ted Kremeneka734a0e2012-12-22 01:34:09 +000011045
11046 CheckForDuplicateEnumValues(*this, Elements, NumElements, Enum, EnumType);
Reid Spencer5f016e22007-07-11 17:01:13 +000011047}
11048
Abramo Bagnara21e006e2011-03-03 14:20:18 +000011049Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr,
11050 SourceLocation StartLoc,
11051 SourceLocation EndLoc) {
John McCall9ae2f072010-08-23 23:25:46 +000011052 StringLiteral *AsmString = cast<StringLiteral>(expr);
Sebastian Redl798d1192008-12-13 16:23:55 +000011053
Douglas Gregor4fe0c8e2009-05-30 00:08:05 +000011054 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext,
Abramo Bagnara21e006e2011-03-03 14:20:18 +000011055 AsmString, StartLoc,
11056 EndLoc);
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +000011057 CurContext->addDecl(New);
John McCalld226f652010-08-21 09:40:31 +000011058 return New;
Anders Carlssondfab6cb2008-02-08 00:33:21 +000011059}
Eli Friedmanc49f19b2009-06-05 02:44:36 +000011060
Douglas Gregor5948ae12012-01-03 18:04:46 +000011061DeclResult Sema::ActOnModuleImport(SourceLocation AtLoc,
11062 SourceLocation ImportLoc,
11063 ModuleIdPath Path) {
Douglas Gregor5e356932011-12-01 17:11:21 +000011064 Module *Mod = PP.getModuleLoader().loadModule(ImportLoc, Path,
Douglas Gregor93ebfa62011-12-02 23:42:12 +000011065 Module::AllVisible,
11066 /*IsIncludeDirective=*/false);
Douglas Gregor1a4761e2011-11-30 23:21:26 +000011067 if (!Mod)
Douglas Gregor6aa52ec2011-08-26 23:56:07 +000011068 return true;
11069
Douglas Gregor15de72c2011-12-02 23:23:56 +000011070 llvm::SmallVector<SourceLocation, 2> IdentifierLocs;
11071 Module *ModCheck = Mod;
11072 for (unsigned I = 0, N = Path.size(); I != N; ++I) {
11073 // If we've run out of module parents, just drop the remaining identifiers.
11074 // We need the length to be consistent.
11075 if (!ModCheck)
11076 break;
11077 ModCheck = ModCheck->Parent;
11078
11079 IdentifierLocs.push_back(Path[I].second);
11080 }
11081
11082 ImportDecl *Import = ImportDecl::Create(Context,
11083 Context.getTranslationUnitDecl(),
Douglas Gregor5948ae12012-01-03 18:04:46 +000011084 AtLoc.isValid()? AtLoc : ImportLoc,
11085 Mod, IdentifierLocs);
Douglas Gregor15de72c2011-12-02 23:23:56 +000011086 Context.getTranslationUnitDecl()->addDecl(Import);
11087 return Import;
Douglas Gregor6aa52ec2011-08-26 23:56:07 +000011088}
11089
David Chisnall5f3c1632012-02-18 16:12:34 +000011090void Sema::ActOnPragmaRedefineExtname(IdentifierInfo* Name,
11091 IdentifierInfo* AliasName,
11092 SourceLocation PragmaLoc,
11093 SourceLocation NameLoc,
11094 SourceLocation AliasNameLoc) {
11095 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc,
11096 LookupOrdinaryName);
11097 AsmLabelAttr *Attr =
11098 ::new (Context) AsmLabelAttr(AliasNameLoc, Context, AliasName->getName());
David Chisnall5f3c1632012-02-18 16:12:34 +000011099
11100 if (PrevDecl)
11101 PrevDecl->addAttr(Attr);
11102 else
11103 (void)ExtnameUndeclaredIdentifiers.insert(
11104 std::pair<IdentifierInfo*,AsmLabelAttr*>(Name, Attr));
11105}
11106
Eli Friedmanc49f19b2009-06-05 02:44:36 +000011107void Sema::ActOnPragmaWeakID(IdentifierInfo* Name,
11108 SourceLocation PragmaLoc,
11109 SourceLocation NameLoc) {
Douglas Gregorc83c6872010-04-15 22:33:43 +000011110 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName);
Eli Friedmanc49f19b2009-06-05 02:44:36 +000011111
Eli Friedmanc49f19b2009-06-05 02:44:36 +000011112 if (PrevDecl) {
Sean Huntcf807c42010-08-18 23:23:40 +000011113 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context));
Ryan Flynne25ff832009-07-30 03:15:39 +000011114 } else {
11115 (void)WeakUndeclaredIdentifiers.insert(
11116 std::pair<IdentifierInfo*,WeakInfo>
11117 (Name, WeakInfo((IdentifierInfo*)0, NameLoc)));
Eli Friedmanc49f19b2009-06-05 02:44:36 +000011118 }
Eli Friedmanc49f19b2009-06-05 02:44:36 +000011119}
11120
11121void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name,
11122 IdentifierInfo* AliasName,
11123 SourceLocation PragmaLoc,
11124 SourceLocation NameLoc,
11125 SourceLocation AliasNameLoc) {
Douglas Gregorc83c6872010-04-15 22:33:43 +000011126 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc,
11127 LookupOrdinaryName);
Ryan Flynne25ff832009-07-30 03:15:39 +000011128 WeakInfo W = WeakInfo(Name, NameLoc);
Eli Friedmanc49f19b2009-06-05 02:44:36 +000011129
Eli Friedmanc49f19b2009-06-05 02:44:36 +000011130 if (PrevDecl) {
Ryan Flynne25ff832009-07-30 03:15:39 +000011131 if (!PrevDecl->hasAttr<AliasAttr>())
11132 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl))
Ryan Flynn7b1fdbd2009-07-31 02:52:19 +000011133 DeclApplyPragmaWeak(TUScope, ND, W);
Ryan Flynne25ff832009-07-30 03:15:39 +000011134 } else {
11135 (void)WeakUndeclaredIdentifiers.insert(
11136 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W));
Eli Friedmanc49f19b2009-06-05 02:44:36 +000011137 }
Eli Friedmanc49f19b2009-06-05 02:44:36 +000011138}
Fariborz Jahaniana28948f2011-08-22 15:54:49 +000011139
11140Decl *Sema::getObjCDeclContext() const {
11141 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext));
11142}
Argyrios Kyrtzidisc076e372011-10-06 23:23:27 +000011143
11144AvailabilityResult Sema::getCurContextAvailability() const {
Fariborz Jahanian3359fa32012-09-06 18:38:58 +000011145 const Decl *D = cast<Decl>(getCurObjCLexicalContext());
Argyrios Kyrtzidisc076e372011-10-06 23:23:27 +000011146 return D->getAvailability();
11147}