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Reid Spencer5f016e22007-07-11 17:01:13 +00001//===--- Sema.cpp - AST Builder and Semantic Analysis Implementation ------===//
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 the actions class which performs semantic analysis and
11// builds an AST out of a parse stream.
12//
13//===----------------------------------------------------------------------===//
14
John McCall9c3087b2010-08-26 02:13:20 +000015#include "clang/Sema/SemaInternal.h"
16#include "clang/Sema/DelayedDiagnostic.h"
Anton Korobeynikov82d0a412010-01-10 12:58:08 +000017#include "TargetAttributesSema.h"
Ryan Flynne25ff832009-07-30 03:15:39 +000018#include "llvm/ADT/DenseMap.h"
Sebastian Redle9d12b62010-01-31 22:27:38 +000019#include "llvm/ADT/SmallSet.h"
John McCall680523a2009-11-07 03:30:10 +000020#include "llvm/ADT/APFloat.h"
John McCall5f1e0942010-08-24 08:50:51 +000021#include "clang/Sema/CXXFieldCollector.h"
Douglas Gregor9b623632010-10-12 23:32:35 +000022#include "clang/Sema/TemplateDeduction.h"
John McCall76bd1f32010-06-01 09:23:16 +000023#include "clang/Sema/ExternalSemaSource.h"
Sebastian Redl8c845712010-09-28 20:23:00 +000024#include "clang/Sema/ObjCMethodList.h"
John McCallf312b1e2010-08-26 23:41:50 +000025#include "clang/Sema/PrettyDeclStackTrace.h"
John McCall5f1e0942010-08-24 08:50:51 +000026#include "clang/Sema/Scope.h"
John McCall781472f2010-08-25 08:40:02 +000027#include "clang/Sema/ScopeInfo.h"
Douglas Gregor46ea32a2010-08-12 22:51:45 +000028#include "clang/Sema/SemaConsumer.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000029#include "clang/AST/ASTContext.h"
Douglas Gregor79a9a342010-02-09 22:26:47 +000030#include "clang/AST/ASTDiagnostic.h"
John McCall384aff82010-08-25 07:42:41 +000031#include "clang/AST/DeclCXX.h"
Daniel Dunbarc4a1dea2008-08-11 05:35:13 +000032#include "clang/AST/DeclObjC.h"
Daniel Dunbare91593e2008-08-11 04:54:23 +000033#include "clang/AST/Expr.h"
Matt Beaumont-Gayc9366ba2011-05-04 22:10:40 +000034#include "clang/AST/ExprCXX.h"
Chris Lattnerad8dcf42011-02-17 07:39:24 +000035#include "clang/AST/StmtCXX.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000036#include "clang/Lex/Preprocessor.h"
Anders Carlsson91a0cc92009-08-26 22:33:56 +000037#include "clang/Basic/PartialDiagnostic.h"
Chris Lattner4d150c82009-04-30 06:18:40 +000038#include "clang/Basic/TargetInfo.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000039using namespace clang;
John McCall781472f2010-08-25 08:40:02 +000040using namespace sema;
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +000041
42FunctionScopeInfo::~FunctionScopeInfo() { }
43
Argyrios Kyrtzidis8fc32d22010-11-19 00:19:15 +000044void FunctionScopeInfo::Clear() {
John McCallb60a77e2010-08-01 00:26:45 +000045 HasBranchProtectedScope = false;
46 HasBranchIntoScope = false;
47 HasIndirectGoto = false;
48
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +000049 SwitchStack.clear();
Douglas Gregor5077c382010-05-15 06:01:05 +000050 Returns.clear();
Argyrios Kyrtzidis8fc32d22010-11-19 00:19:15 +000051 ErrorTrap.reset();
Ted Kremenek351ba912011-02-23 01:52:04 +000052 PossiblyUnreachableDiags.clear();
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +000053}
54
55BlockScopeInfo::~BlockScopeInfo() { }
56
Douglas Gregorc1a3e5e2010-08-25 18:07:12 +000057void Sema::ActOnTranslationUnitScope(Scope *S) {
Steve Naroffb216c882007-10-09 22:01:59 +000058 TUScope = S;
Douglas Gregor44b43212008-12-11 16:49:14 +000059 PushDeclContext(S, Context.getTranslationUnitDecl());
Mike Stump1eb44332009-09-09 15:08:12 +000060
John McCallc7e04da2010-05-28 18:45:08 +000061 VAListTagName = PP.getIdentifierInfo("__va_list_tag");
62
Sebastian Redlc43b54c2010-08-18 23:56:43 +000063 if (!Context.isInt128Installed() && // May be set by ASTReader.
Argyrios Kyrtzidis00611382010-07-04 21:44:19 +000064 PP.getTargetInfo().getPointerWidth(0) >= 64) {
John McCalla93c9342009-12-07 02:54:59 +000065 TypeSourceInfo *TInfo;
John McCallba6a9bd2009-10-24 08:00:42 +000066
Chris Lattner4d150c82009-04-30 06:18:40 +000067 // Install [u]int128_t for 64-bit targets.
John McCalla93c9342009-12-07 02:54:59 +000068 TInfo = Context.getTrivialTypeSourceInfo(Context.Int128Ty);
Chris Lattner4d150c82009-04-30 06:18:40 +000069 PushOnScopeChains(TypedefDecl::Create(Context, CurContext,
70 SourceLocation(),
Abramo Bagnara344577e2011-03-06 15:48:19 +000071 SourceLocation(),
Chris Lattner4d150c82009-04-30 06:18:40 +000072 &Context.Idents.get("__int128_t"),
John McCalla93c9342009-12-07 02:54:59 +000073 TInfo), TUScope);
John McCallba6a9bd2009-10-24 08:00:42 +000074
John McCalla93c9342009-12-07 02:54:59 +000075 TInfo = Context.getTrivialTypeSourceInfo(Context.UnsignedInt128Ty);
Chris Lattner4d150c82009-04-30 06:18:40 +000076 PushOnScopeChains(TypedefDecl::Create(Context, CurContext,
77 SourceLocation(),
Abramo Bagnara344577e2011-03-06 15:48:19 +000078 SourceLocation(),
Chris Lattner4d150c82009-04-30 06:18:40 +000079 &Context.Idents.get("__uint128_t"),
John McCalla93c9342009-12-07 02:54:59 +000080 TInfo), TUScope);
Argyrios Kyrtzidis00611382010-07-04 21:44:19 +000081 Context.setInt128Installed();
Chris Lattner4d150c82009-04-30 06:18:40 +000082 }
Mike Stump1eb44332009-09-09 15:08:12 +000083
84
Chris Lattner2ae34ed2008-02-06 00:46:58 +000085 if (!PP.getLangOptions().ObjC1) return;
Mike Stump1eb44332009-09-09 15:08:12 +000086
Sebastian Redlc43b54c2010-08-18 23:56:43 +000087 // Built-in ObjC types may already be set by ASTReader (hence isNull checks).
Douglas Gregor319ac892009-04-23 22:29:11 +000088 if (Context.getObjCSelType().isNull()) {
Fariborz Jahanian13dcd002009-11-21 19:53:08 +000089 // Create the built-in typedef for 'SEL'.
Fariborz Jahanian04765ac2009-11-23 18:04:25 +000090 QualType SelT = Context.getPointerType(Context.ObjCBuiltinSelTy);
John McCalla93c9342009-12-07 02:54:59 +000091 TypeSourceInfo *SelInfo = Context.getTrivialTypeSourceInfo(SelT);
John McCallba6a9bd2009-10-24 08:00:42 +000092 TypedefDecl *SelTypedef
Abramo Bagnara344577e2011-03-06 15:48:19 +000093 = TypedefDecl::Create(Context, CurContext,
94 SourceLocation(), SourceLocation(),
John McCallba6a9bd2009-10-24 08:00:42 +000095 &Context.Idents.get("SEL"), SelInfo);
Douglas Gregor319ac892009-04-23 22:29:11 +000096 PushOnScopeChains(SelTypedef, TUScope);
97 Context.setObjCSelType(Context.getTypeDeclType(SelTypedef));
Fariborz Jahanian369a3bd2009-11-25 23:07:42 +000098 Context.ObjCSelRedefinitionType = Context.getObjCSelType();
Douglas Gregor319ac892009-04-23 22:29:11 +000099 }
Chris Lattner6ee1f9c2008-06-21 20:20:39 +0000100
Chris Lattner6ee1f9c2008-06-21 20:20:39 +0000101 // Synthesize "@class Protocol;
Douglas Gregor319ac892009-04-23 22:29:11 +0000102 if (Context.getObjCProtoType().isNull()) {
103 ObjCInterfaceDecl *ProtocolDecl =
104 ObjCInterfaceDecl::Create(Context, CurContext, SourceLocation(),
Mike Stump1eb44332009-09-09 15:08:12 +0000105 &Context.Idents.get("Protocol"),
Douglas Gregordeacbdc2010-08-11 12:19:30 +0000106 SourceLocation(), true);
Douglas Gregor319ac892009-04-23 22:29:11 +0000107 Context.setObjCProtoType(Context.getObjCInterfaceType(ProtocolDecl));
Fariborz Jahanian10324db2009-11-18 23:15:37 +0000108 PushOnScopeChains(ProtocolDecl, TUScope, false);
Douglas Gregor319ac892009-04-23 22:29:11 +0000109 }
Steve Naroffde2e22d2009-07-15 18:40:39 +0000110 // Create the built-in typedef for 'id'.
Douglas Gregor319ac892009-04-23 22:29:11 +0000111 if (Context.getObjCIdType().isNull()) {
John McCallc12c5bb2010-05-15 11:32:37 +0000112 QualType T = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 0, 0);
113 T = Context.getObjCObjectPointerType(T);
114 TypeSourceInfo *IdInfo = Context.getTrivialTypeSourceInfo(T);
John McCallba6a9bd2009-10-24 08:00:42 +0000115 TypedefDecl *IdTypedef
Abramo Bagnara344577e2011-03-06 15:48:19 +0000116 = TypedefDecl::Create(Context, CurContext,
117 SourceLocation(), SourceLocation(),
John McCallba6a9bd2009-10-24 08:00:42 +0000118 &Context.Idents.get("id"), IdInfo);
Douglas Gregor319ac892009-04-23 22:29:11 +0000119 PushOnScopeChains(IdTypedef, TUScope);
120 Context.setObjCIdType(Context.getTypeDeclType(IdTypedef));
David Chisnall0f436562009-08-17 16:35:33 +0000121 Context.ObjCIdRedefinitionType = Context.getObjCIdType();
Douglas Gregor319ac892009-04-23 22:29:11 +0000122 }
Steve Naroffde2e22d2009-07-15 18:40:39 +0000123 // Create the built-in typedef for 'Class'.
Steve Naroff14108da2009-07-10 23:34:53 +0000124 if (Context.getObjCClassType().isNull()) {
John McCallc12c5bb2010-05-15 11:32:37 +0000125 QualType T = Context.getObjCObjectType(Context.ObjCBuiltinClassTy, 0, 0);
126 T = Context.getObjCObjectPointerType(T);
127 TypeSourceInfo *ClassInfo = Context.getTrivialTypeSourceInfo(T);
John McCallba6a9bd2009-10-24 08:00:42 +0000128 TypedefDecl *ClassTypedef
Abramo Bagnara344577e2011-03-06 15:48:19 +0000129 = TypedefDecl::Create(Context, CurContext,
130 SourceLocation(), SourceLocation(),
John McCallba6a9bd2009-10-24 08:00:42 +0000131 &Context.Idents.get("Class"), ClassInfo);
Steve Naroff14108da2009-07-10 23:34:53 +0000132 PushOnScopeChains(ClassTypedef, TUScope);
133 Context.setObjCClassType(Context.getTypeDeclType(ClassTypedef));
David Chisnall0f436562009-08-17 16:35:33 +0000134 Context.ObjCClassRedefinitionType = Context.getObjCClassType();
Douglas Gregor46ea32a2010-08-12 22:51:45 +0000135 }
Steve Naroff3b950172007-10-10 21:53:07 +0000136}
137
Douglas Gregorf807fe02009-04-14 16:27:31 +0000138Sema::Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
Daniel Dunbar3a2838d2009-11-13 08:58:20 +0000139 bool CompleteTranslationUnit,
140 CodeCompleteConsumer *CodeCompleter)
Peter Collingbourne321b8172011-02-14 01:42:35 +0000141 : TheTargetAttributesSema(0), FPFeatures(pp.getLangOptions()),
Anton Korobeynikov82d0a412010-01-10 12:58:08 +0000142 LangOpts(pp.getLangOptions()), PP(pp), Context(ctxt), Consumer(consumer),
Mike Stump1eb44332009-09-09 15:08:12 +0000143 Diags(PP.getDiagnostics()), SourceMgr(PP.getSourceManager()),
Daniel Dunbar3a2838d2009-11-13 08:58:20 +0000144 ExternalSource(0), CodeCompleter(CodeCompleter), CurContext(0),
Fariborz Jahanian62c92582011-04-25 18:49:15 +0000145 PackContext(0), MSStructPragmaOn(false), VisContext(0),
John McCallf85e1932011-06-15 23:02:42 +0000146 ExprNeedsCleanups(0), LateTemplateParser(0), OpaqueParser(0),
Douglas Gregor4eb4f0f2010-09-08 23:14:30 +0000147 IdResolver(pp.getLangOptions()), CXXTypeInfoDecl(0), MSVCGuidDecl(0),
Bill Wendlingb7566d82010-09-08 21:30:16 +0000148 GlobalNewDeleteDeclared(false),
Douglas Gregor48dd19b2009-05-14 21:44:34 +0000149 CompleteTranslationUnit(CompleteTranslationUnit),
Douglas Gregor1eee5dc2011-01-27 22:31:44 +0000150 NumSFINAEErrors(0), SuppressAccessChecking(false),
151 AccessCheckingSFINAE(false), InNonInstantiationSFINAEContext(false),
Douglas Gregor8491ffe2010-12-20 22:05:00 +0000152 NonInstantiationEntries(0), ArgumentPackSubstitutionIndex(-1),
153 CurrentInstantiationScope(0), TyposCorrected(0),
Bill Wendlingb7566d82010-09-08 21:30:16 +0000154 AnalysisWarnings(*this)
Douglas Gregorf35f8282009-11-11 21:54:23 +0000155{
Steve Naroff3b950172007-10-10 21:53:07 +0000156 TUScope = 0;
Douglas Gregord8bba9c2011-06-28 16:20:02 +0000157 LoadedExternalKnownNamespaces = false;
158
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000159 if (getLangOptions().CPlusPlus)
160 FieldCollector.reset(new CXXFieldCollector());
Mike Stump1eb44332009-09-09 15:08:12 +0000161
Chris Lattner22caddc2008-11-23 09:13:29 +0000162 // Tell diagnostics how to render things from the AST library.
Douglas Gregor79a9a342010-02-09 22:26:47 +0000163 PP.getDiagnostics().SetArgToStringFn(&FormatASTNodeDiagnosticArgument,
164 &Context);
Douglas Gregor2afce722009-11-26 00:44:06 +0000165
166 ExprEvalContexts.push_back(
John McCallf85e1932011-06-15 23:02:42 +0000167 ExpressionEvaluationContextRecord(PotentiallyEvaluated, 0, false));
John McCall781472f2010-08-25 08:40:02 +0000168
Argyrios Kyrtzidis8fc32d22010-11-19 00:19:15 +0000169 FunctionScopes.push_back(new FunctionScopeInfo(Diags));
Douglas Gregor46ea32a2010-08-12 22:51:45 +0000170}
171
172void Sema::Initialize() {
173 // Tell the AST consumer about this Sema object.
174 Consumer.Initialize(Context);
175
176 // FIXME: Isn't this redundant with the initialization above?
177 if (SemaConsumer *SC = dyn_cast<SemaConsumer>(&Consumer))
178 SC->InitializeSema(*this);
179
180 // Tell the external Sema source about this Sema object.
181 if (ExternalSemaSource *ExternalSema
182 = dyn_cast_or_null<ExternalSemaSource>(Context.getExternalSource()))
183 ExternalSema->InitializeSema(*this);
Reid Spencer5f016e22007-07-11 17:01:13 +0000184}
185
Anton Korobeynikov82d0a412010-01-10 12:58:08 +0000186Sema::~Sema() {
187 if (PackContext) FreePackedContext();
Eli Friedmanaa8b0d12010-08-05 06:57:20 +0000188 if (VisContext) FreeVisContext();
Anton Korobeynikov82d0a412010-01-10 12:58:08 +0000189 delete TheTargetAttributesSema;
Fariborz Jahanian62c92582011-04-25 18:49:15 +0000190 MSStructPragmaOn = false;
John McCall781472f2010-08-25 08:40:02 +0000191 // Kill all the active scopes.
192 for (unsigned I = 1, E = FunctionScopes.size(); I != E; ++I)
193 delete FunctionScopes[I];
194 if (FunctionScopes.size() == 1)
195 delete FunctionScopes[0];
Douglas Gregor46ea32a2010-08-12 22:51:45 +0000196
197 // Tell the SemaConsumer to forget about us; we're going out of scope.
198 if (SemaConsumer *SC = dyn_cast<SemaConsumer>(&Consumer))
199 SC->ForgetSema();
200
201 // Detach from the external Sema source.
202 if (ExternalSemaSource *ExternalSema
Douglas Gregor914ed9d2010-08-13 03:15:25 +0000203 = dyn_cast_or_null<ExternalSemaSource>(Context.getExternalSource()))
Douglas Gregor46ea32a2010-08-12 22:51:45 +0000204 ExternalSema->ForgetSema();
Anton Korobeynikov82d0a412010-01-10 12:58:08 +0000205}
206
John McCallf85e1932011-06-15 23:02:42 +0000207
208/// makeUnavailableInSystemHeader - There is an error in the current
209/// context. If we're still in a system header, and we can plausibly
210/// make the relevant declaration unavailable instead of erroring, do
211/// so and return true.
212bool Sema::makeUnavailableInSystemHeader(SourceLocation loc,
213 llvm::StringRef msg) {
214 // If we're not in a function, it's an error.
215 FunctionDecl *fn = dyn_cast<FunctionDecl>(CurContext);
216 if (!fn) return false;
217
218 // If we're in template instantiation, it's an error.
219 if (!ActiveTemplateInstantiations.empty())
220 return false;
221
222 // If that function's not in a system header, it's an error.
223 if (!Context.getSourceManager().isInSystemHeader(loc))
224 return false;
225
226 // If the function is already unavailable, it's not an error.
227 if (fn->hasAttr<UnavailableAttr>()) return true;
228
229 fn->addAttr(new (Context) UnavailableAttr(loc, Context, msg));
230 return true;
231}
232
Sebastian Redl58a2cd82011-04-24 16:28:06 +0000233ASTMutationListener *Sema::getASTMutationListener() const {
234 return getASTConsumer().GetASTMutationListener();
235}
236
Mike Stump1eb44332009-09-09 15:08:12 +0000237/// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit cast.
Chris Lattner1e0a3902008-01-16 19:17:22 +0000238/// If there is already an implicit cast, merge into the existing one.
Sebastian Redl906082e2010-07-20 04:20:21 +0000239/// The result is of the given category.
John Wiegley429bb272011-04-08 18:41:53 +0000240ExprResult Sema::ImpCastExprToType(Expr *E, QualType Ty,
241 CastKind Kind, ExprValueKind VK,
John McCallf85e1932011-06-15 23:02:42 +0000242 const CXXCastPath *BasePath,
243 CheckedConversionKind CCK) {
John Wiegley429bb272011-04-08 18:41:53 +0000244 QualType ExprTy = Context.getCanonicalType(E->getType());
Mon P Wang3a2c7442008-09-04 08:38:01 +0000245 QualType TypeTy = Context.getCanonicalType(Ty);
Mike Stump1eb44332009-09-09 15:08:12 +0000246
Mon P Wang3a2c7442008-09-04 08:38:01 +0000247 if (ExprTy == TypeTy)
John Wiegley429bb272011-04-08 18:41:53 +0000248 return Owned(E);
Mike Stump1eb44332009-09-09 15:08:12 +0000249
John McCallf85e1932011-06-15 23:02:42 +0000250 if (getLangOptions().ObjCAutoRefCount)
251 CheckObjCARCConversion(SourceRange(), Ty, E, CCK);
252
Douglas Gregor6fb745b2010-05-13 16:44:06 +0000253 // If this is a derived-to-base cast to a through a virtual base, we
254 // need a vtable.
John McCall2de56d12010-08-25 11:45:40 +0000255 if (Kind == CK_DerivedToBase &&
John McCallf871d0c2010-08-07 06:22:56 +0000256 BasePathInvolvesVirtualBase(*BasePath)) {
John Wiegley429bb272011-04-08 18:41:53 +0000257 QualType T = E->getType();
Douglas Gregor6fb745b2010-05-13 16:44:06 +0000258 if (const PointerType *Pointer = T->getAs<PointerType>())
259 T = Pointer->getPointeeType();
260 if (const RecordType *RecordTy = T->getAs<RecordType>())
John Wiegley429bb272011-04-08 18:41:53 +0000261 MarkVTableUsed(E->getLocStart(),
Douglas Gregor6fb745b2010-05-13 16:44:06 +0000262 cast<CXXRecordDecl>(RecordTy->getDecl()));
263 }
264
John Wiegley429bb272011-04-08 18:41:53 +0000265 if (ImplicitCastExpr *ImpCast = dyn_cast<ImplicitCastExpr>(E)) {
John McCallf871d0c2010-08-07 06:22:56 +0000266 if (ImpCast->getCastKind() == Kind && (!BasePath || BasePath->empty())) {
Anders Carlsson4c5fad32009-09-15 05:28:24 +0000267 ImpCast->setType(Ty);
John McCall5baba9d2010-08-25 10:28:54 +0000268 ImpCast->setValueKind(VK);
John Wiegley429bb272011-04-08 18:41:53 +0000269 return Owned(E);
Anders Carlsson4c5fad32009-09-15 05:28:24 +0000270 }
271 }
272
John Wiegley429bb272011-04-08 18:41:53 +0000273 return Owned(ImplicitCastExpr::Create(Context, Ty, Kind, E, BasePath, VK));
Sebastian Redl906082e2010-07-20 04:20:21 +0000274}
275
Abramo Bagnara737d5442011-04-07 09:26:19 +0000276/// ScalarTypeToBooleanCastKind - Returns the cast kind corresponding
277/// to the conversion from scalar type ScalarTy to the Boolean type.
278CastKind Sema::ScalarTypeToBooleanCastKind(QualType ScalarTy) {
279 switch (ScalarTy->getScalarTypeKind()) {
280 case Type::STK_Bool: return CK_NoOp;
281 case Type::STK_Pointer: return CK_PointerToBoolean;
282 case Type::STK_MemberPointer: return CK_MemberPointerToBoolean;
283 case Type::STK_Integral: return CK_IntegralToBoolean;
284 case Type::STK_Floating: return CK_FloatingToBoolean;
285 case Type::STK_IntegralComplex: return CK_IntegralComplexToBoolean;
286 case Type::STK_FloatingComplex: return CK_FloatingComplexToBoolean;
287 }
288 return CK_Invalid;
289}
290
John McCall5baba9d2010-08-25 10:28:54 +0000291ExprValueKind Sema::CastCategory(Expr *E) {
Sebastian Redl906082e2010-07-20 04:20:21 +0000292 Expr::Classification Classification = E->Classify(Context);
John McCall5baba9d2010-08-25 10:28:54 +0000293 return Classification.isRValue() ? VK_RValue :
294 (Classification.isLValue() ? VK_LValue : VK_XValue);
Chris Lattner1e0a3902008-01-16 19:17:22 +0000295}
296
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +0000297/// \brief Used to prune the decls of Sema's UnusedFileScopedDecls vector.
298static bool ShouldRemoveFromUnused(Sema *SemaRef, const DeclaratorDecl *D) {
299 if (D->isUsed())
300 return true;
301
302 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
303 // UnusedFileScopedDecls stores the first declaration.
304 // The declaration may have become definition so check again.
305 const FunctionDecl *DeclToCheck;
306 if (FD->hasBody(DeclToCheck))
307 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
308
309 // Later redecls may add new information resulting in not having to warn,
310 // so check again.
311 DeclToCheck = FD->getMostRecentDeclaration();
312 if (DeclToCheck != FD)
313 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
314 }
315
316 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
317 // UnusedFileScopedDecls stores the first declaration.
318 // The declaration may have become definition so check again.
319 const VarDecl *DeclToCheck = VD->getDefinition();
320 if (DeclToCheck)
321 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
322
323 // Later redecls may add new information resulting in not having to warn,
324 // so check again.
325 DeclToCheck = VD->getMostRecentDeclaration();
326 if (DeclToCheck != VD)
327 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
328 }
329
330 return false;
331}
332
John McCall15e310a2011-02-19 02:53:41 +0000333namespace {
334 struct UndefinedInternal {
335 NamedDecl *decl;
336 FullSourceLoc useLoc;
337
338 UndefinedInternal(NamedDecl *decl, FullSourceLoc useLoc)
339 : decl(decl), useLoc(useLoc) {}
340 };
341
342 bool operator<(const UndefinedInternal &l, const UndefinedInternal &r) {
343 return l.useLoc.isBeforeInTranslationUnitThan(r.useLoc);
344 }
345}
346
347/// checkUndefinedInternals - Check for undefined objects with internal linkage.
348static void checkUndefinedInternals(Sema &S) {
349 if (S.UndefinedInternals.empty()) return;
350
351 // Collect all the still-undefined entities with internal linkage.
352 llvm::SmallVector<UndefinedInternal, 16> undefined;
353 for (llvm::DenseMap<NamedDecl*,SourceLocation>::iterator
354 i = S.UndefinedInternals.begin(), e = S.UndefinedInternals.end();
355 i != e; ++i) {
356 NamedDecl *decl = i->first;
357
358 // Ignore attributes that have become invalid.
359 if (decl->isInvalidDecl()) continue;
360
361 // __attribute__((weakref)) is basically a definition.
362 if (decl->hasAttr<WeakRefAttr>()) continue;
363
364 if (FunctionDecl *fn = dyn_cast<FunctionDecl>(decl)) {
365 if (fn->isPure() || fn->hasBody())
366 continue;
367 } else {
368 if (cast<VarDecl>(decl)->hasDefinition() != VarDecl::DeclarationOnly)
369 continue;
370 }
371
372 // We build a FullSourceLoc so that we can sort with array_pod_sort.
373 FullSourceLoc loc(i->second, S.Context.getSourceManager());
374 undefined.push_back(UndefinedInternal(decl, loc));
375 }
376
377 if (undefined.empty()) return;
378
379 // Sort (in order of use site) so that we're not (as) dependent on
380 // the iteration order through an llvm::DenseMap.
381 llvm::array_pod_sort(undefined.begin(), undefined.end());
382
383 for (llvm::SmallVectorImpl<UndefinedInternal>::iterator
384 i = undefined.begin(), e = undefined.end(); i != e; ++i) {
385 NamedDecl *decl = i->decl;
386 S.Diag(decl->getLocation(), diag::warn_undefined_internal)
387 << isa<VarDecl>(decl) << decl;
388 S.Diag(i->useLoc, diag::note_used_here);
389 }
390}
391
Chris Lattner9299f3f2008-08-23 03:19:52 +0000392/// ActOnEndOfTranslationUnit - This is called at the very end of the
393/// translation unit when EOF is reached and all but the top-level scope is
394/// popped.
Argyrios Kyrtzidis0e036382010-08-05 09:48:16 +0000395void Sema::ActOnEndOfTranslationUnit() {
396 // At PCH writing, implicit instantiations and VTable handling info are
397 // stored and performed when the PCH is included.
Nick Lewycky2a5f99e2010-11-25 00:35:20 +0000398 if (CompleteTranslationUnit) {
Chandler Carruthaee543a2010-12-12 21:36:11 +0000399 // If any dynamic classes have their key function defined within
400 // this translation unit, then those vtables are considered "used" and must
401 // be emitted.
402 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) {
Anders Carlssona5c6c2a2011-01-25 18:08:22 +0000403 assert(!DynamicClasses[I]->isDependentType() &&
404 "Should not see dependent types here!");
Chandler Carruthaee543a2010-12-12 21:36:11 +0000405 if (const CXXMethodDecl *KeyFunction
406 = Context.getKeyFunction(DynamicClasses[I])) {
407 const FunctionDecl *Definition = 0;
408 if (KeyFunction->hasBody(Definition))
409 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true);
410 }
411 }
412
Nick Lewycky81559102011-05-31 07:58:42 +0000413 // If DefinedUsedVTables ends up marking any virtual member functions it
414 // might lead to more pending template instantiations, which we then need
415 // to instantiate.
416 DefineUsedVTables();
Argyrios Kyrtzidis0e036382010-08-05 09:48:16 +0000417
Nick Lewycky81559102011-05-31 07:58:42 +0000418 // C++: Perform implicit template instantiations.
419 //
420 // FIXME: When we perform these implicit instantiations, we do not
421 // carefully keep track of the point of instantiation (C++ [temp.point]).
422 // This means that name lookup that occurs within the template
423 // instantiation will always happen at the end of the translation unit,
424 // so it will find some names that should not be found. Although this is
425 // common behavior for C++ compilers, it is technically wrong. In the
426 // future, we either need to be able to filter the results of name lookup
427 // or we need to perform template instantiations earlier.
428 PerformPendingInstantiations();
Nick Lewycky2a5f99e2010-11-25 00:35:20 +0000429 }
Anders Carlssond6a637f2009-12-07 08:24:59 +0000430
Argyrios Kyrtzidis49b96d12010-08-13 18:42:17 +0000431 // Remove file scoped decls that turned out to be used.
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +0000432 UnusedFileScopedDecls.erase(std::remove_if(UnusedFileScopedDecls.begin(),
433 UnusedFileScopedDecls.end(),
434 std::bind1st(std::ptr_fun(ShouldRemoveFromUnused),
435 this)),
Argyrios Kyrtzidis49b96d12010-08-13 18:42:17 +0000436 UnusedFileScopedDecls.end());
Douglas Gregor47268a32010-04-09 17:41:13 +0000437
Douglas Gregor87c08a52010-08-13 22:48:40 +0000438 if (!CompleteTranslationUnit) {
439 TUScope = 0;
Argyrios Kyrtzidis72b90572010-08-05 09:48:08 +0000440 return;
Douglas Gregor87c08a52010-08-13 22:48:40 +0000441 }
Argyrios Kyrtzidis72b90572010-08-05 09:48:08 +0000442
Chris Lattner63d65f82009-09-08 18:19:27 +0000443 // Check for #pragma weak identifiers that were never declared
444 // FIXME: This will cause diagnostics to be emitted in a non-determinstic
445 // order! Iterating over a densemap like this is bad.
Ryan Flynne25ff832009-07-30 03:15:39 +0000446 for (llvm::DenseMap<IdentifierInfo*,WeakInfo>::iterator
Chris Lattner63d65f82009-09-08 18:19:27 +0000447 I = WeakUndeclaredIdentifiers.begin(),
448 E = WeakUndeclaredIdentifiers.end(); I != E; ++I) {
449 if (I->second.getUsed()) continue;
Mike Stump1eb44332009-09-09 15:08:12 +0000450
Chris Lattner63d65f82009-09-08 18:19:27 +0000451 Diag(I->second.getLocation(), diag::warn_weak_identifier_undeclared)
452 << I->first;
Ryan Flynne25ff832009-07-30 03:15:39 +0000453 }
454
Douglas Gregor275a3692009-03-10 23:43:53 +0000455 // C99 6.9.2p2:
456 // A declaration of an identifier for an object that has file
457 // scope without an initializer, and without a storage-class
458 // specifier or with the storage-class specifier static,
459 // constitutes a tentative definition. If a translation unit
460 // contains one or more tentative definitions for an identifier,
461 // and the translation unit contains no external definition for
462 // that identifier, then the behavior is exactly as if the
463 // translation unit contains a file scope declaration of that
464 // identifier, with the composite type as of the end of the
465 // translation unit, with an initializer equal to 0.
Sebastian Redle9d12b62010-01-31 22:27:38 +0000466 llvm::SmallSet<VarDecl *, 32> Seen;
467 for (unsigned i = 0, e = TentativeDefinitions.size(); i != e; ++i) {
468 VarDecl *VD = TentativeDefinitions[i]->getActingDefinition();
Mike Stump1eb44332009-09-09 15:08:12 +0000469
Sebastian Redle9d12b62010-01-31 22:27:38 +0000470 // If the tentative definition was completed, getActingDefinition() returns
471 // null. If we've already seen this variable before, insert()'s second
472 // return value is false.
473 if (VD == 0 || VD->isInvalidDecl() || !Seen.insert(VD))
Douglas Gregorb6c8c8b2009-04-21 17:11:58 +0000474 continue;
475
Mike Stump1eb44332009-09-09 15:08:12 +0000476 if (const IncompleteArrayType *ArrayT
Douglas Gregorb6c8c8b2009-04-21 17:11:58 +0000477 = Context.getAsIncompleteArrayType(VD->getType())) {
Mike Stump1eb44332009-09-09 15:08:12 +0000478 if (RequireCompleteType(VD->getLocation(),
Douglas Gregorb6c8c8b2009-04-21 17:11:58 +0000479 ArrayT->getElementType(),
Chris Lattner63d65f82009-09-08 18:19:27 +0000480 diag::err_tentative_def_incomplete_type_arr)) {
Douglas Gregorb6c8c8b2009-04-21 17:11:58 +0000481 VD->setInvalidDecl();
Chris Lattner63d65f82009-09-08 18:19:27 +0000482 continue;
Douglas Gregor275a3692009-03-10 23:43:53 +0000483 }
Mike Stump1eb44332009-09-09 15:08:12 +0000484
Chris Lattner63d65f82009-09-08 18:19:27 +0000485 // Set the length of the array to 1 (C99 6.9.2p5).
486 Diag(VD->getLocation(), diag::warn_tentative_incomplete_array);
487 llvm::APInt One(Context.getTypeSize(Context.getSizeType()), true);
John McCall46a617a2009-10-16 00:14:28 +0000488 QualType T = Context.getConstantArrayType(ArrayT->getElementType(),
489 One, ArrayType::Normal, 0);
Chris Lattner63d65f82009-09-08 18:19:27 +0000490 VD->setType(T);
Mike Stump1eb44332009-09-09 15:08:12 +0000491 } else if (RequireCompleteType(VD->getLocation(), VD->getType(),
Douglas Gregorb6c8c8b2009-04-21 17:11:58 +0000492 diag::err_tentative_def_incomplete_type))
493 VD->setInvalidDecl();
494
495 // Notify the consumer that we've completed a tentative definition.
496 if (!VD->isInvalidDecl())
497 Consumer.CompleteTentativeDefinition(VD);
498
Douglas Gregor275a3692009-03-10 23:43:53 +0000499 }
Argyrios Kyrtzidis43f0a7c2011-01-31 07:04:37 +0000500
Sean Huntc1598702011-05-05 00:05:47 +0000501 if (LangOpts.CPlusPlus0x &&
502 Diags.getDiagnosticLevel(diag::warn_delegating_ctor_cycle,
503 SourceLocation())
504 != Diagnostic::Ignored)
Sean Huntfe57eef2011-05-04 05:57:24 +0000505 CheckDelegatingCtorCycles();
506
Argyrios Kyrtzidis43f0a7c2011-01-31 07:04:37 +0000507 // If there were errors, disable 'unused' warnings since they will mostly be
508 // noise.
509 if (!Diags.hasErrorOccurred()) {
510 // Output warning for unused file scoped decls.
511 for (llvm::SmallVectorImpl<const DeclaratorDecl*>::iterator
512 I = UnusedFileScopedDecls.begin(),
513 E = UnusedFileScopedDecls.end(); I != E; ++I) {
514 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(*I)) {
515 const FunctionDecl *DiagD;
516 if (!FD->hasBody(DiagD))
517 DiagD = FD;
Argyrios Kyrtzidis48b89592011-03-03 17:47:42 +0000518 if (DiagD->isDeleted())
519 continue; // Deleted functions are supposed to be unused.
Argyrios Kyrtzidis6b6b42a2011-04-19 19:51:10 +0000520 if (DiagD->isReferenced()) {
521 if (isa<CXXMethodDecl>(DiagD))
522 Diag(DiagD->getLocation(), diag::warn_unneeded_member_function)
523 << DiagD->getDeclName();
524 else
525 Diag(DiagD->getLocation(), diag::warn_unneeded_internal_decl)
526 << /*function*/0 << DiagD->getDeclName();
527 } else {
528 Diag(DiagD->getLocation(),
529 isa<CXXMethodDecl>(DiagD) ? diag::warn_unused_member_function
530 : diag::warn_unused_function)
531 << DiagD->getDeclName();
532 }
Argyrios Kyrtzidis43f0a7c2011-01-31 07:04:37 +0000533 } else {
534 const VarDecl *DiagD = cast<VarDecl>(*I)->getDefinition();
535 if (!DiagD)
536 DiagD = cast<VarDecl>(*I);
Argyrios Kyrtzidis6b6b42a2011-04-19 19:51:10 +0000537 if (DiagD->isReferenced()) {
538 Diag(DiagD->getLocation(), diag::warn_unneeded_internal_decl)
539 << /*variable*/1 << DiagD->getDeclName();
540 } else {
541 Diag(DiagD->getLocation(), diag::warn_unused_variable)
542 << DiagD->getDeclName();
543 }
Argyrios Kyrtzidis43f0a7c2011-01-31 07:04:37 +0000544 }
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +0000545 }
John McCall15e310a2011-02-19 02:53:41 +0000546
547 checkUndefinedInternals(*this);
Argyrios Kyrtzidis49b96d12010-08-13 18:42:17 +0000548 }
Douglas Gregor87c08a52010-08-13 22:48:40 +0000549
Richard Smith483b9f32011-02-21 20:05:19 +0000550 // Check we've noticed that we're no longer parsing the initializer for every
551 // variable. If we miss cases, then at best we have a performance issue and
552 // at worst a rejects-valid bug.
553 assert(ParsingInitForAutoVars.empty() &&
554 "Didn't unmark var as having its initializer parsed");
555
Douglas Gregor87c08a52010-08-13 22:48:40 +0000556 TUScope = 0;
Chris Lattner9299f3f2008-08-23 03:19:52 +0000557}
558
559
Reid Spencer5f016e22007-07-11 17:01:13 +0000560//===----------------------------------------------------------------------===//
561// Helper functions.
562//===----------------------------------------------------------------------===//
563
Anders Carlsson8517d9b2009-08-08 17:45:02 +0000564DeclContext *Sema::getFunctionLevelDeclContext() {
John McCalldb0ee1d2009-12-19 10:53:49 +0000565 DeclContext *DC = CurContext;
Mike Stump1eb44332009-09-09 15:08:12 +0000566
Douglas Gregord9008312010-05-22 16:25:05 +0000567 while (isa<BlockDecl>(DC) || isa<EnumDecl>(DC))
Anders Carlsson8517d9b2009-08-08 17:45:02 +0000568 DC = DC->getParent();
Mike Stump1eb44332009-09-09 15:08:12 +0000569
Anders Carlsson8517d9b2009-08-08 17:45:02 +0000570 return DC;
571}
572
Chris Lattner371f2582008-12-04 23:50:19 +0000573/// getCurFunctionDecl - If inside of a function body, this returns a pointer
574/// to the function decl for the function being parsed. If we're currently
575/// in a 'block', this returns the containing context.
576FunctionDecl *Sema::getCurFunctionDecl() {
Anders Carlsson8517d9b2009-08-08 17:45:02 +0000577 DeclContext *DC = getFunctionLevelDeclContext();
Chris Lattner371f2582008-12-04 23:50:19 +0000578 return dyn_cast<FunctionDecl>(DC);
579}
580
Daniel Dunbarc4a1dea2008-08-11 05:35:13 +0000581ObjCMethodDecl *Sema::getCurMethodDecl() {
Anders Carlsson8517d9b2009-08-08 17:45:02 +0000582 DeclContext *DC = getFunctionLevelDeclContext();
Steve Naroffd7612e12008-11-17 16:28:52 +0000583 return dyn_cast<ObjCMethodDecl>(DC);
Daniel Dunbarc4a1dea2008-08-11 05:35:13 +0000584}
Chris Lattner371f2582008-12-04 23:50:19 +0000585
586NamedDecl *Sema::getCurFunctionOrMethodDecl() {
Anders Carlsson8517d9b2009-08-08 17:45:02 +0000587 DeclContext *DC = getFunctionLevelDeclContext();
Chris Lattner371f2582008-12-04 23:50:19 +0000588 if (isa<ObjCMethodDecl>(DC) || isa<FunctionDecl>(DC))
Douglas Gregor4afa39d2009-01-20 01:17:11 +0000589 return cast<NamedDecl>(DC);
Chris Lattner371f2582008-12-04 23:50:19 +0000590 return 0;
591}
592
Douglas Gregor25a88bb2009-03-20 22:48:49 +0000593Sema::SemaDiagnosticBuilder::~SemaDiagnosticBuilder() {
Douglas Gregor9b623632010-10-12 23:32:35 +0000594 if (!isActive())
595 return;
596
Douglas Gregor1eee5dc2011-01-27 22:31:44 +0000597 if (llvm::Optional<TemplateDeductionInfo*> Info = SemaRef.isSFINAEContext()) {
Argyrios Kyrtzidis33e4e702010-11-18 20:06:41 +0000598 switch (DiagnosticIDs::getDiagnosticSFINAEResponse(getDiagID())) {
599 case DiagnosticIDs::SFINAE_Report:
Douglas Gregor9b623632010-10-12 23:32:35 +0000600 // Fall through; we'll report the diagnostic below.
601 break;
602
Douglas Gregor1eee5dc2011-01-27 22:31:44 +0000603 case DiagnosticIDs::SFINAE_AccessControl:
Douglas Gregor7822ee32011-05-11 23:45:11 +0000604 // Per C++ Core Issue 1170, access control is part of SFINAE.
605 // Additionally, the AccessCheckingSFINAE flag can be used to temporary
606 // make access control a part of SFINAE for the purposes of checking
607 // type traits.
608 if (!SemaRef.AccessCheckingSFINAE &&
609 !SemaRef.getLangOptions().CPlusPlus0x)
Douglas Gregor1eee5dc2011-01-27 22:31:44 +0000610 break;
611
Argyrios Kyrtzidis33e4e702010-11-18 20:06:41 +0000612 case DiagnosticIDs::SFINAE_SubstitutionFailure:
Douglas Gregor9b623632010-10-12 23:32:35 +0000613 // Count this failure so that we know that template argument deduction
614 // has failed.
615 ++SemaRef.NumSFINAEErrors;
616 SemaRef.Diags.setLastDiagnosticIgnored();
617 SemaRef.Diags.Clear();
618 Clear();
619 return;
620
Argyrios Kyrtzidis33e4e702010-11-18 20:06:41 +0000621 case DiagnosticIDs::SFINAE_Suppress:
Douglas Gregor9b623632010-10-12 23:32:35 +0000622 // Make a copy of this suppressed diagnostic and store it with the
623 // template-deduction information;
Douglas Gregorb5350412010-10-13 17:22:14 +0000624 FlushCounts();
Douglas Gregor9b623632010-10-12 23:32:35 +0000625 DiagnosticInfo DiagInfo(&SemaRef.Diags);
Douglas Gregorb5350412010-10-13 17:22:14 +0000626
Douglas Gregor1eee5dc2011-01-27 22:31:44 +0000627 if (*Info)
628 (*Info)->addSuppressedDiagnostic(DiagInfo.getLocation(),
Douglas Gregor9b623632010-10-12 23:32:35 +0000629 PartialDiagnostic(DiagInfo,
630 SemaRef.Context.getDiagAllocator()));
631
632 // Suppress this diagnostic.
633 SemaRef.Diags.setLastDiagnosticIgnored();
634 SemaRef.Diags.Clear();
635 Clear();
636 return;
637 }
638 }
639
640 // Emit the diagnostic.
Douglas Gregor5e9f35c2009-06-14 07:33:30 +0000641 if (!this->Emit())
642 return;
Mike Stump1eb44332009-09-09 15:08:12 +0000643
Douglas Gregor25a88bb2009-03-20 22:48:49 +0000644 // If this is not a note, and we're in a template instantiation
645 // that is different from the last template instantiation where
646 // we emitted an error, print a template instantiation
647 // backtrace.
Argyrios Kyrtzidis33e4e702010-11-18 20:06:41 +0000648 if (!DiagnosticIDs::isBuiltinNote(DiagID) &&
Douglas Gregor25a88bb2009-03-20 22:48:49 +0000649 !SemaRef.ActiveTemplateInstantiations.empty() &&
Mike Stump1eb44332009-09-09 15:08:12 +0000650 SemaRef.ActiveTemplateInstantiations.back()
Douglas Gregor25a88bb2009-03-20 22:48:49 +0000651 != SemaRef.LastTemplateInstantiationErrorContext) {
652 SemaRef.PrintInstantiationStack();
Mike Stump1eb44332009-09-09 15:08:12 +0000653 SemaRef.LastTemplateInstantiationErrorContext
Douglas Gregor25a88bb2009-03-20 22:48:49 +0000654 = SemaRef.ActiveTemplateInstantiations.back();
655 }
656}
Douglas Gregor2e222532009-07-02 17:08:52 +0000657
Douglas Gregoreab5d1e2010-03-25 22:17:48 +0000658Sema::SemaDiagnosticBuilder Sema::Diag(SourceLocation Loc, unsigned DiagID) {
Argyrios Kyrtzidis33e4e702010-11-18 20:06:41 +0000659 DiagnosticBuilder DB = Diags.Report(Loc, DiagID);
Douglas Gregoreab5d1e2010-03-25 22:17:48 +0000660 return SemaDiagnosticBuilder(DB, *this, DiagID);
661}
662
Anders Carlsson91a0cc92009-08-26 22:33:56 +0000663Sema::SemaDiagnosticBuilder
664Sema::Diag(SourceLocation Loc, const PartialDiagnostic& PD) {
665 SemaDiagnosticBuilder Builder(Diag(Loc, PD.getDiagID()));
666 PD.Emit(Builder);
Mike Stump1eb44332009-09-09 15:08:12 +0000667
Anders Carlsson91a0cc92009-08-26 22:33:56 +0000668 return Builder;
669}
670
John McCall834e3f62011-03-08 07:59:04 +0000671/// \brief Looks through the macro-instantiation chain for the given
672/// location, looking for a macro instantiation with the given name.
673/// If one is found, returns true and sets the location to that
674/// instantiation loc.
675bool Sema::findMacroSpelling(SourceLocation &locref, llvm::StringRef name) {
676 SourceLocation loc = locref;
677 if (!loc.isMacroID()) return false;
678
679 // There's no good way right now to look at the intermediate
680 // instantiations, so just jump to the instantiation location.
681 loc = getSourceManager().getInstantiationLoc(loc);
682
683 // If that's written with the name, stop here.
684 llvm::SmallVector<char, 16> buffer;
685 if (getPreprocessor().getSpelling(loc, buffer) == name) {
686 locref = loc;
687 return true;
688 }
689 return false;
690}
691
Douglas Gregor23c94db2010-07-02 17:43:08 +0000692/// \brief Determines the active Scope associated with the given declaration
693/// context.
694///
695/// This routine maps a declaration context to the active Scope object that
696/// represents that declaration context in the parser. It is typically used
697/// from "scope-less" code (e.g., template instantiation, lazy creation of
698/// declarations) that injects a name for name-lookup purposes and, therefore,
699/// must update the Scope.
700///
701/// \returns The scope corresponding to the given declaraion context, or NULL
702/// if no such scope is open.
703Scope *Sema::getScopeForContext(DeclContext *Ctx) {
704
705 if (!Ctx)
706 return 0;
707
708 Ctx = Ctx->getPrimaryContext();
709 for (Scope *S = getCurScope(); S; S = S->getParent()) {
Sebastian Redlcddc69f2010-07-08 23:07:34 +0000710 // Ignore scopes that cannot have declarations. This is important for
711 // out-of-line definitions of static class members.
712 if (S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope))
713 if (DeclContext *Entity = static_cast<DeclContext *> (S->getEntity()))
714 if (Ctx == Entity->getPrimaryContext())
715 return S;
Douglas Gregor23c94db2010-07-02 17:43:08 +0000716 }
717
718 return 0;
719}
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +0000720
721/// \brief Enter a new function scope
722void Sema::PushFunctionScope() {
John McCall781472f2010-08-25 08:40:02 +0000723 if (FunctionScopes.size() == 1) {
724 // Use the "top" function scope rather than having to allocate
725 // memory for a new scope.
Argyrios Kyrtzidis8fc32d22010-11-19 00:19:15 +0000726 FunctionScopes.back()->Clear();
John McCall781472f2010-08-25 08:40:02 +0000727 FunctionScopes.push_back(FunctionScopes.back());
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +0000728 return;
729 }
730
Argyrios Kyrtzidis8fc32d22010-11-19 00:19:15 +0000731 FunctionScopes.push_back(new FunctionScopeInfo(getDiagnostics()));
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +0000732}
733
734void Sema::PushBlockScope(Scope *BlockScope, BlockDecl *Block) {
Argyrios Kyrtzidis8fc32d22010-11-19 00:19:15 +0000735 FunctionScopes.push_back(new BlockScopeInfo(getDiagnostics(),
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +0000736 BlockScope, Block));
737}
738
Ted Kremenek3ed6fc02011-02-23 01:51:48 +0000739void Sema::PopFunctionOrBlockScope(const AnalysisBasedWarnings::Policy *WP,
740 const Decl *D, const BlockExpr *blkExpr) {
741 FunctionScopeInfo *Scope = FunctionScopes.pop_back_val();
John McCall781472f2010-08-25 08:40:02 +0000742 assert(!FunctionScopes.empty() && "mismatched push/pop!");
Ted Kremenek3ed6fc02011-02-23 01:51:48 +0000743
744 // Issue any analysis-based warnings.
745 if (WP && D)
Ted Kremenek283a3582011-02-23 01:51:53 +0000746 AnalysisWarnings.IssueWarnings(*WP, Scope, D, blkExpr);
Ted Kremenek351ba912011-02-23 01:52:04 +0000747 else {
748 for (llvm::SmallVectorImpl<sema::PossiblyUnreachableDiag>::iterator
749 i = Scope->PossiblyUnreachableDiags.begin(),
750 e = Scope->PossiblyUnreachableDiags.end();
751 i != e; ++i) {
752 const sema::PossiblyUnreachableDiag &D = *i;
753 Diag(D.Loc, D.PD);
754 }
755 }
Ted Kremenek3ed6fc02011-02-23 01:51:48 +0000756
Ted Kremenek351ba912011-02-23 01:52:04 +0000757 if (FunctionScopes.back() != Scope) {
John McCall781472f2010-08-25 08:40:02 +0000758 delete Scope;
Ted Kremenek351ba912011-02-23 01:52:04 +0000759 }
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +0000760}
761
762/// \brief Determine whether any errors occurred within this function/method/
763/// block.
John McCallf85e1932011-06-15 23:02:42 +0000764bool Sema::hasAnyUnrecoverableErrorsInThisFunction() const {
765 return getCurFunction()->ErrorTrap.hasUnrecoverableErrorOccurred();
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +0000766}
767
768BlockScopeInfo *Sema::getCurBlock() {
769 if (FunctionScopes.empty())
770 return 0;
771
772 return dyn_cast<BlockScopeInfo>(FunctionScopes.back());
773}
John McCall76bd1f32010-06-01 09:23:16 +0000774
775// Pin this vtable to this file.
776ExternalSemaSource::~ExternalSemaSource() {}
John McCallf312b1e2010-08-26 23:41:50 +0000777
Sebastian Redl8c845712010-09-28 20:23:00 +0000778std::pair<ObjCMethodList, ObjCMethodList>
779ExternalSemaSource::ReadMethodPool(Selector Sel) {
780 return std::pair<ObjCMethodList, ObjCMethodList>();
781}
782
Douglas Gregord8bba9c2011-06-28 16:20:02 +0000783void ExternalSemaSource::ReadKnownNamespaces(
784 llvm::SmallVectorImpl<NamespaceDecl *> &Namespaces) {
785}
786
John McCallf312b1e2010-08-26 23:41:50 +0000787void PrettyDeclStackTraceEntry::print(llvm::raw_ostream &OS) const {
788 SourceLocation Loc = this->Loc;
789 if (!Loc.isValid() && TheDecl) Loc = TheDecl->getLocation();
790 if (Loc.isValid()) {
791 Loc.print(OS, S.getSourceManager());
792 OS << ": ";
793 }
794 OS << Message;
795
796 if (TheDecl && isa<NamedDecl>(TheDecl)) {
797 std::string Name = cast<NamedDecl>(TheDecl)->getNameAsString();
798 if (!Name.empty())
799 OS << " '" << Name << '\'';
800 }
801
802 OS << '\n';
803}
Matt Beaumont-Gayc9366ba2011-05-04 22:10:40 +0000804
805/// \brief Figure out if an expression could be turned into a call.
806///
807/// Use this when trying to recover from an error where the programmer may have
808/// written just the name of a function instead of actually calling it.
809///
810/// \param E - The expression to examine.
811/// \param ZeroArgCallReturnTy - If the expression can be turned into a call
812/// with no arguments, this parameter is set to the type returned by such a
813/// call; otherwise, it is set to an empty QualType.
814/// \param NonTemplateOverloads - If the expression is an overloaded function
815/// name, this parameter is populated with the decls of the various overloads.
816bool Sema::isExprCallable(const Expr &E, QualType &ZeroArgCallReturnTy,
817 UnresolvedSetImpl &NonTemplateOverloads) {
818 ZeroArgCallReturnTy = QualType();
819 NonTemplateOverloads.clear();
820 if (const OverloadExpr *Overloads = dyn_cast<OverloadExpr>(&E)) {
821 for (OverloadExpr::decls_iterator it = Overloads->decls_begin(),
822 DeclsEnd = Overloads->decls_end(); it != DeclsEnd; ++it) {
823 // Our overload set may include TemplateDecls, which we'll ignore for our
824 // present purpose.
825 if (const FunctionDecl *OverloadDecl = dyn_cast<FunctionDecl>(*it)) {
826 NonTemplateOverloads.addDecl(*it);
827 if (OverloadDecl->getMinRequiredArguments() == 0)
828 ZeroArgCallReturnTy = OverloadDecl->getResultType();
829 }
830 }
831 return true;
832 }
833
834 if (const DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(&E)) {
835 if (const FunctionDecl *Fun = dyn_cast<FunctionDecl>(DeclRef->getDecl())) {
836 if (Fun->getMinRequiredArguments() == 0)
837 ZeroArgCallReturnTy = Fun->getResultType();
838 return true;
839 }
840 }
841
842 // We don't have an expression that's convenient to get a FunctionDecl from,
843 // but we can at least check if the type is "function of 0 arguments".
844 QualType ExprTy = E.getType();
845 const FunctionType *FunTy = NULL;
Matt Beaumont-Gay9389ddc2011-05-05 00:59:35 +0000846 QualType PointeeTy = ExprTy->getPointeeType();
847 if (!PointeeTy.isNull())
848 FunTy = PointeeTy->getAs<FunctionType>();
Matt Beaumont-Gayc9366ba2011-05-04 22:10:40 +0000849 if (!FunTy)
850 FunTy = ExprTy->getAs<FunctionType>();
851 if (!FunTy && ExprTy == Context.BoundMemberTy) {
852 // Look for the bound-member type. If it's still overloaded, give up,
853 // although we probably should have fallen into the OverloadExpr case above
854 // if we actually have an overloaded bound member.
855 QualType BoundMemberTy = Expr::findBoundMemberType(&E);
856 if (!BoundMemberTy.isNull())
857 FunTy = BoundMemberTy->castAs<FunctionType>();
858 }
859
860 if (const FunctionProtoType *FPT =
861 dyn_cast_or_null<FunctionProtoType>(FunTy)) {
862 if (FPT->getNumArgs() == 0)
863 ZeroArgCallReturnTy = FunTy->getResultType();
864 return true;
865 }
866 return false;
867}
868
869/// \brief Give notes for a set of overloads.
870///
871/// A companion to isExprCallable. In cases when the name that the programmer
872/// wrote was an overloaded function, we may be able to make some guesses about
873/// plausible overloads based on their return types; such guesses can be handed
874/// off to this method to be emitted as notes.
875///
876/// \param Overloads - The overloads to note.
877/// \param FinalNoteLoc - If we've suppressed printing some overloads due to
878/// -fshow-overloads=best, this is the location to attach to the note about too
879/// many candidates. Typically this will be the location of the original
880/// ill-formed expression.
881void Sema::NoteOverloads(const UnresolvedSetImpl &Overloads,
882 const SourceLocation FinalNoteLoc) {
883 int ShownOverloads = 0;
884 int SuppressedOverloads = 0;
885 for (UnresolvedSetImpl::iterator It = Overloads.begin(),
886 DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
887 // FIXME: Magic number for max shown overloads stolen from
888 // OverloadCandidateSet::NoteCandidates.
889 if (ShownOverloads >= 4 &&
890 Diags.getShowOverloads() == Diagnostic::Ovl_Best) {
891 ++SuppressedOverloads;
892 continue;
893 }
894 Diag(cast<FunctionDecl>(*It)->getSourceRange().getBegin(),
895 diag::note_member_ref_possible_intended_overload);
896 ++ShownOverloads;
897 }
898 if (SuppressedOverloads)
899 Diag(FinalNoteLoc, diag::note_ovl_too_many_candidates)
900 << SuppressedOverloads;
901}