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Chris Lattner3d1cee32008-04-08 05:04:30 +00001//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file implements semantic analysis for C++ declarations.
11//
12//===----------------------------------------------------------------------===//
13
14#include "Sema.h"
Douglas Gregor7ad83902008-11-05 04:29:56 +000015#include "SemaInherit.h"
Argyrios Kyrtzidisa4755c62008-08-09 00:58:37 +000016#include "clang/AST/ASTConsumer.h"
Douglas Gregore37ac4f2008-04-13 21:30:24 +000017#include "clang/AST/ASTContext.h"
Anders Carlsson8211eff2009-03-24 01:19:16 +000018#include "clang/AST/DeclVisitor.h"
Douglas Gregor02189362008-10-22 21:13:31 +000019#include "clang/AST/TypeOrdering.h"
Chris Lattner8123a952008-04-10 02:22:51 +000020#include "clang/AST/StmtVisitor.h"
Argyrios Kyrtzidis06ad1f52008-10-06 18:37:09 +000021#include "clang/Lex/Preprocessor.h"
Daniel Dunbar12bc6922008-08-11 03:27:53 +000022#include "clang/Parse/DeclSpec.h"
Douglas Gregor3fc749d2008-12-23 00:26:44 +000023#include "llvm/ADT/STLExtras.h"
Chris Lattner8123a952008-04-10 02:22:51 +000024#include "llvm/Support/Compiler.h"
Douglas Gregor8e9bebd2008-10-21 16:13:35 +000025#include <algorithm> // for std::equal
Douglas Gregorf8268ae2008-10-22 17:49:05 +000026#include <map>
Chris Lattner3d1cee32008-04-08 05:04:30 +000027
28using namespace clang;
29
Chris Lattner8123a952008-04-10 02:22:51 +000030//===----------------------------------------------------------------------===//
31// CheckDefaultArgumentVisitor
32//===----------------------------------------------------------------------===//
33
Chris Lattner9e979552008-04-12 23:52:44 +000034namespace {
35 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses
36 /// the default argument of a parameter to determine whether it
37 /// contains any ill-formed subexpressions. For example, this will
38 /// diagnose the use of local variables or parameters within the
39 /// default argument expression.
40 class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor
Chris Lattnerb77792e2008-07-26 22:17:49 +000041 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> {
Chris Lattner9e979552008-04-12 23:52:44 +000042 Expr *DefaultArg;
43 Sema *S;
Chris Lattner8123a952008-04-10 02:22:51 +000044
Chris Lattner9e979552008-04-12 23:52:44 +000045 public:
46 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s)
47 : DefaultArg(defarg), S(s) {}
Chris Lattner8123a952008-04-10 02:22:51 +000048
Chris Lattner9e979552008-04-12 23:52:44 +000049 bool VisitExpr(Expr *Node);
50 bool VisitDeclRefExpr(DeclRefExpr *DRE);
Douglas Gregor796da182008-11-04 14:32:21 +000051 bool VisitCXXThisExpr(CXXThisExpr *ThisE);
Chris Lattner9e979552008-04-12 23:52:44 +000052 };
Chris Lattner8123a952008-04-10 02:22:51 +000053
Chris Lattner9e979552008-04-12 23:52:44 +000054 /// VisitExpr - Visit all of the children of this expression.
55 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) {
56 bool IsInvalid = false;
Chris Lattnerb77792e2008-07-26 22:17:49 +000057 for (Stmt::child_iterator I = Node->child_begin(),
58 E = Node->child_end(); I != E; ++I)
59 IsInvalid |= Visit(*I);
Chris Lattner9e979552008-04-12 23:52:44 +000060 return IsInvalid;
Chris Lattner8123a952008-04-10 02:22:51 +000061 }
62
Chris Lattner9e979552008-04-12 23:52:44 +000063 /// VisitDeclRefExpr - Visit a reference to a declaration, to
64 /// determine whether this declaration can be used in the default
65 /// argument expression.
66 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) {
Douglas Gregor8e9bebd2008-10-21 16:13:35 +000067 NamedDecl *Decl = DRE->getDecl();
Chris Lattner9e979552008-04-12 23:52:44 +000068 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) {
69 // C++ [dcl.fct.default]p9
70 // Default arguments are evaluated each time the function is
71 // called. The order of evaluation of function arguments is
72 // unspecified. Consequently, parameters of a function shall not
73 // be used in default argument expressions, even if they are not
74 // evaluated. Parameters of a function declared before a default
75 // argument expression are in scope and can hide namespace and
76 // class member names.
77 return S->Diag(DRE->getSourceRange().getBegin(),
Chris Lattnerfa25bbb2008-11-19 05:08:23 +000078 diag::err_param_default_argument_references_param)
Chris Lattner08631c52008-11-23 21:45:46 +000079 << Param->getDeclName() << DefaultArg->getSourceRange();
Steve Naroff248a7532008-04-15 22:42:06 +000080 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) {
Chris Lattner9e979552008-04-12 23:52:44 +000081 // C++ [dcl.fct.default]p7
82 // Local variables shall not be used in default argument
83 // expressions.
Steve Naroff248a7532008-04-15 22:42:06 +000084 if (VDecl->isBlockVarDecl())
85 return S->Diag(DRE->getSourceRange().getBegin(),
Chris Lattnerfa25bbb2008-11-19 05:08:23 +000086 diag::err_param_default_argument_references_local)
Chris Lattner08631c52008-11-23 21:45:46 +000087 << VDecl->getDeclName() << DefaultArg->getSourceRange();
Chris Lattner9e979552008-04-12 23:52:44 +000088 }
Chris Lattner8123a952008-04-10 02:22:51 +000089
Douglas Gregor3996f232008-11-04 13:41:56 +000090 return false;
91 }
Chris Lattner9e979552008-04-12 23:52:44 +000092
Douglas Gregor796da182008-11-04 14:32:21 +000093 /// VisitCXXThisExpr - Visit a C++ "this" expression.
94 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) {
95 // C++ [dcl.fct.default]p8:
96 // The keyword this shall not be used in a default argument of a
97 // member function.
98 return S->Diag(ThisE->getSourceRange().getBegin(),
Chris Lattnerfa25bbb2008-11-19 05:08:23 +000099 diag::err_param_default_argument_references_this)
100 << ThisE->getSourceRange();
Chris Lattner9e979552008-04-12 23:52:44 +0000101 }
Chris Lattner8123a952008-04-10 02:22:51 +0000102}
103
104/// ActOnParamDefaultArgument - Check whether the default argument
105/// provided for a function parameter is well-formed. If so, attach it
106/// to the parameter declaration.
Chris Lattner3d1cee32008-04-08 05:04:30 +0000107void
Chris Lattnerb28317a2009-03-28 19:18:32 +0000108Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc,
Sebastian Redlf53597f2009-03-15 17:47:39 +0000109 ExprArg defarg) {
Douglas Gregor4c4f7cb2009-06-22 23:20:33 +0000110 if (!param || !defarg.get())
111 return;
112
Chris Lattnerb28317a2009-03-28 19:18:32 +0000113 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>());
Anders Carlsson5e300d12009-06-12 16:51:40 +0000114 UnparsedDefaultArgLocs.erase(Param);
115
Anders Carlssonf1b1d592009-05-01 19:30:39 +0000116 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>());
Chris Lattner3d1cee32008-04-08 05:04:30 +0000117 QualType ParamType = Param->getType();
118
119 // Default arguments are only permitted in C++
120 if (!getLangOptions().CPlusPlus) {
Chris Lattnerfa25bbb2008-11-19 05:08:23 +0000121 Diag(EqualLoc, diag::err_param_default_argument)
122 << DefaultArg->getSourceRange();
Douglas Gregor72b505b2008-12-16 21:30:33 +0000123 Param->setInvalidDecl();
Chris Lattner3d1cee32008-04-08 05:04:30 +0000124 return;
125 }
126
127 // C++ [dcl.fct.default]p5
128 // A default argument expression is implicitly converted (clause
129 // 4) to the parameter type. The default argument expression has
130 // the same semantic constraints as the initializer expression in
131 // a declaration of a variable of the parameter type, using the
132 // copy-initialization semantics (8.5).
Chris Lattner3d1cee32008-04-08 05:04:30 +0000133 Expr *DefaultArgPtr = DefaultArg.get();
Douglas Gregor61366e92008-12-24 00:01:03 +0000134 bool DefaultInitFailed = CheckInitializerTypes(DefaultArgPtr, ParamType,
135 EqualLoc,
Douglas Gregor09f41cf2009-01-14 15:45:31 +0000136 Param->getDeclName(),
137 /*DirectInit=*/false);
Chris Lattner3d1cee32008-04-08 05:04:30 +0000138 if (DefaultArgPtr != DefaultArg.get()) {
139 DefaultArg.take();
140 DefaultArg.reset(DefaultArgPtr);
141 }
Douglas Gregoreb704f22008-11-04 13:57:51 +0000142 if (DefaultInitFailed) {
Chris Lattner3d1cee32008-04-08 05:04:30 +0000143 return;
144 }
145
Chris Lattner8123a952008-04-10 02:22:51 +0000146 // Check that the default argument is well-formed
Chris Lattner9e979552008-04-12 23:52:44 +0000147 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this);
Douglas Gregor72b505b2008-12-16 21:30:33 +0000148 if (DefaultArgChecker.Visit(DefaultArg.get())) {
149 Param->setInvalidDecl();
Chris Lattner8123a952008-04-10 02:22:51 +0000150 return;
Douglas Gregor72b505b2008-12-16 21:30:33 +0000151 }
Chris Lattner8123a952008-04-10 02:22:51 +0000152
Anders Carlssonf54741e2009-06-16 03:37:31 +0000153 DefaultArgPtr = MaybeCreateCXXExprWithTemporaries(DefaultArg.take(),
154 /*DestroyTemps=*/false);
155
Chris Lattner3d1cee32008-04-08 05:04:30 +0000156 // Okay: add the default argument to the parameter
Anders Carlssonf54741e2009-06-16 03:37:31 +0000157 Param->setDefaultArg(DefaultArgPtr);
Chris Lattner3d1cee32008-04-08 05:04:30 +0000158}
159
Douglas Gregor61366e92008-12-24 00:01:03 +0000160/// ActOnParamUnparsedDefaultArgument - We've seen a default
161/// argument for a function parameter, but we can't parse it yet
162/// because we're inside a class definition. Note that this default
163/// argument will be parsed later.
Chris Lattnerb28317a2009-03-28 19:18:32 +0000164void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param,
Anders Carlsson5e300d12009-06-12 16:51:40 +0000165 SourceLocation EqualLoc,
166 SourceLocation ArgLoc) {
Douglas Gregor4c4f7cb2009-06-22 23:20:33 +0000167 if (!param)
168 return;
169
Chris Lattnerb28317a2009-03-28 19:18:32 +0000170 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>());
Douglas Gregor61366e92008-12-24 00:01:03 +0000171 if (Param)
172 Param->setUnparsedDefaultArg();
Anders Carlsson5e300d12009-06-12 16:51:40 +0000173
174 UnparsedDefaultArgLocs[Param] = ArgLoc;
Douglas Gregor61366e92008-12-24 00:01:03 +0000175}
176
Douglas Gregor72b505b2008-12-16 21:30:33 +0000177/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of
178/// the default argument for the parameter param failed.
Chris Lattnerb28317a2009-03-28 19:18:32 +0000179void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) {
Douglas Gregor4c4f7cb2009-06-22 23:20:33 +0000180 if (!param)
181 return;
182
Anders Carlsson5e300d12009-06-12 16:51:40 +0000183 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>());
184
185 Param->setInvalidDecl();
186
187 UnparsedDefaultArgLocs.erase(Param);
Douglas Gregor72b505b2008-12-16 21:30:33 +0000188}
189
Douglas Gregor6d6eb572008-05-07 04:49:29 +0000190/// CheckExtraCXXDefaultArguments - Check for any extra default
191/// arguments in the declarator, which is not a function declaration
192/// or definition and therefore is not permitted to have default
193/// arguments. This routine should be invoked for every declarator
194/// that is not a function declaration or definition.
195void Sema::CheckExtraCXXDefaultArguments(Declarator &D) {
196 // C++ [dcl.fct.default]p3
197 // A default argument expression shall be specified only in the
198 // parameter-declaration-clause of a function declaration or in a
199 // template-parameter (14.1). It shall not be specified for a
200 // parameter pack. If it is specified in a
201 // parameter-declaration-clause, it shall not occur within a
202 // declarator or abstract-declarator of a parameter-declaration.
Chris Lattnerb28317a2009-03-28 19:18:32 +0000203 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
Douglas Gregor6d6eb572008-05-07 04:49:29 +0000204 DeclaratorChunk &chunk = D.getTypeObject(i);
205 if (chunk.Kind == DeclaratorChunk::Function) {
Chris Lattnerb28317a2009-03-28 19:18:32 +0000206 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) {
207 ParmVarDecl *Param =
208 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>());
Douglas Gregor61366e92008-12-24 00:01:03 +0000209 if (Param->hasUnparsedDefaultArg()) {
210 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens;
Douglas Gregor72b505b2008-12-16 21:30:33 +0000211 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc)
212 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation());
213 delete Toks;
214 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0;
Douglas Gregor61366e92008-12-24 00:01:03 +0000215 } else if (Param->getDefaultArg()) {
216 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc)
217 << Param->getDefaultArg()->getSourceRange();
218 Param->setDefaultArg(0);
Douglas Gregor6d6eb572008-05-07 04:49:29 +0000219 }
220 }
221 }
222 }
223}
224
Chris Lattner3d1cee32008-04-08 05:04:30 +0000225// MergeCXXFunctionDecl - Merge two declarations of the same C++
226// function, once we already know that they have the same
Douglas Gregorcda9c672009-02-16 17:45:42 +0000227// type. Subroutine of MergeFunctionDecl. Returns true if there was an
228// error, false otherwise.
229bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) {
230 bool Invalid = false;
231
Chris Lattner3d1cee32008-04-08 05:04:30 +0000232 // C++ [dcl.fct.default]p4:
233 //
234 // For non-template functions, default arguments can be added in
235 // later declarations of a function in the same
236 // scope. Declarations in different scopes have completely
237 // distinct sets of default arguments. That is, declarations in
238 // inner scopes do not acquire default arguments from
239 // declarations in outer scopes, and vice versa. In a given
240 // function declaration, all parameters subsequent to a
241 // parameter with a default argument shall have default
242 // arguments supplied in this or previous declarations. A
243 // default argument shall not be redefined by a later
244 // declaration (not even to the same value).
245 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) {
246 ParmVarDecl *OldParam = Old->getParamDecl(p);
247 ParmVarDecl *NewParam = New->getParamDecl(p);
248
249 if(OldParam->getDefaultArg() && NewParam->getDefaultArg()) {
250 Diag(NewParam->getLocation(),
Chris Lattnerfa25bbb2008-11-19 05:08:23 +0000251 diag::err_param_default_argument_redefinition)
252 << NewParam->getDefaultArg()->getSourceRange();
Chris Lattner5f4a6822008-11-23 23:12:31 +0000253 Diag(OldParam->getLocation(), diag::note_previous_definition);
Douglas Gregorcda9c672009-02-16 17:45:42 +0000254 Invalid = true;
Chris Lattner3d1cee32008-04-08 05:04:30 +0000255 } else if (OldParam->getDefaultArg()) {
256 // Merge the old default argument into the new parameter
257 NewParam->setDefaultArg(OldParam->getDefaultArg());
258 }
259 }
260
Douglas Gregorcda9c672009-02-16 17:45:42 +0000261 return Invalid;
Chris Lattner3d1cee32008-04-08 05:04:30 +0000262}
263
264/// CheckCXXDefaultArguments - Verify that the default arguments for a
265/// function declaration are well-formed according to C++
266/// [dcl.fct.default].
267void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) {
268 unsigned NumParams = FD->getNumParams();
269 unsigned p;
270
271 // Find first parameter with a default argument
272 for (p = 0; p < NumParams; ++p) {
273 ParmVarDecl *Param = FD->getParamDecl(p);
274 if (Param->getDefaultArg())
275 break;
276 }
277
278 // C++ [dcl.fct.default]p4:
279 // In a given function declaration, all parameters
280 // subsequent to a parameter with a default argument shall
281 // have default arguments supplied in this or previous
282 // declarations. A default argument shall not be redefined
283 // by a later declaration (not even to the same value).
284 unsigned LastMissingDefaultArg = 0;
285 for(; p < NumParams; ++p) {
286 ParmVarDecl *Param = FD->getParamDecl(p);
287 if (!Param->getDefaultArg()) {
Douglas Gregor72b505b2008-12-16 21:30:33 +0000288 if (Param->isInvalidDecl())
289 /* We already complained about this parameter. */;
290 else if (Param->getIdentifier())
Chris Lattner3d1cee32008-04-08 05:04:30 +0000291 Diag(Param->getLocation(),
Chris Lattnerfa25bbb2008-11-19 05:08:23 +0000292 diag::err_param_default_argument_missing_name)
Chris Lattner43b628c2008-11-19 07:32:16 +0000293 << Param->getIdentifier();
Chris Lattner3d1cee32008-04-08 05:04:30 +0000294 else
295 Diag(Param->getLocation(),
296 diag::err_param_default_argument_missing);
297
298 LastMissingDefaultArg = p;
299 }
300 }
301
302 if (LastMissingDefaultArg > 0) {
303 // Some default arguments were missing. Clear out all of the
304 // default arguments up to (and including) the last missing
305 // default argument, so that we leave the function parameters
306 // in a semantically valid state.
307 for (p = 0; p <= LastMissingDefaultArg; ++p) {
308 ParmVarDecl *Param = FD->getParamDecl(p);
Anders Carlsson5e300d12009-06-12 16:51:40 +0000309 if (Param->hasDefaultArg()) {
Douglas Gregor61366e92008-12-24 00:01:03 +0000310 if (!Param->hasUnparsedDefaultArg())
311 Param->getDefaultArg()->Destroy(Context);
Chris Lattner3d1cee32008-04-08 05:04:30 +0000312 Param->setDefaultArg(0);
313 }
314 }
315 }
316}
Douglas Gregore37ac4f2008-04-13 21:30:24 +0000317
Douglas Gregorb48fe382008-10-31 09:07:45 +0000318/// isCurrentClassName - Determine whether the identifier II is the
319/// name of the class type currently being defined. In the case of
320/// nested classes, this will only return true if II is the name of
321/// the innermost class.
Argyrios Kyrtzidiseb83ecd2008-11-08 16:45:02 +0000322bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *,
323 const CXXScopeSpec *SS) {
Argyrios Kyrtzidisef6e6472008-11-08 17:17:31 +0000324 CXXRecordDecl *CurDecl;
Douglas Gregore4e5b052009-03-19 00:18:19 +0000325 if (SS && SS->isSet() && !SS->isInvalid()) {
326 DeclContext *DC = computeDeclContext(*SS);
Argyrios Kyrtzidisef6e6472008-11-08 17:17:31 +0000327 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC);
328 } else
329 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext);
330
331 if (CurDecl)
Douglas Gregorb48fe382008-10-31 09:07:45 +0000332 return &II == CurDecl->getIdentifier();
333 else
334 return false;
335}
336
Douglas Gregor2943aed2009-03-03 04:44:36 +0000337/// \brief Check the validity of a C++ base class specifier.
338///
339/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics
340/// and returns NULL otherwise.
341CXXBaseSpecifier *
342Sema::CheckBaseSpecifier(CXXRecordDecl *Class,
343 SourceRange SpecifierRange,
344 bool Virtual, AccessSpecifier Access,
345 QualType BaseType,
346 SourceLocation BaseLoc) {
347 // C++ [class.union]p1:
348 // A union shall not have base classes.
349 if (Class->isUnion()) {
350 Diag(Class->getLocation(), diag::err_base_clause_on_union)
351 << SpecifierRange;
352 return 0;
353 }
354
355 if (BaseType->isDependentType())
356 return new CXXBaseSpecifier(SpecifierRange, Virtual,
357 Class->getTagKind() == RecordDecl::TK_class,
358 Access, BaseType);
359
360 // Base specifiers must be record types.
361 if (!BaseType->isRecordType()) {
362 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange;
363 return 0;
364 }
365
366 // C++ [class.union]p1:
367 // A union shall not be used as a base class.
368 if (BaseType->isUnionType()) {
369 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange;
370 return 0;
371 }
372
373 // C++ [class.derived]p2:
374 // The class-name in a base-specifier shall not be an incompletely
375 // defined class.
Douglas Gregor86447ec2009-03-09 16:13:40 +0000376 if (RequireCompleteType(BaseLoc, BaseType, diag::err_incomplete_base_class,
Douglas Gregor26dce442009-03-10 00:06:19 +0000377 SpecifierRange))
Douglas Gregor2943aed2009-03-03 04:44:36 +0000378 return 0;
379
380 // If the base class is polymorphic, the new one is, too.
381 RecordDecl *BaseDecl = BaseType->getAsRecordType()->getDecl();
382 assert(BaseDecl && "Record type has no declaration");
383 BaseDecl = BaseDecl->getDefinition(Context);
384 assert(BaseDecl && "Base type is not incomplete, but has no definition");
385 if (cast<CXXRecordDecl>(BaseDecl)->isPolymorphic())
386 Class->setPolymorphic(true);
387
388 // C++ [dcl.init.aggr]p1:
389 // An aggregate is [...] a class with [...] no base classes [...].
390 Class->setAggregate(false);
391 Class->setPOD(false);
392
Anders Carlsson347ba892009-04-16 00:08:20 +0000393 if (Virtual) {
394 // C++ [class.ctor]p5:
395 // A constructor is trivial if its class has no virtual base classes.
396 Class->setHasTrivialConstructor(false);
397 } else {
398 // C++ [class.ctor]p5:
399 // A constructor is trivial if all the direct base classes of its
400 // class have trivial constructors.
401 Class->setHasTrivialConstructor(cast<CXXRecordDecl>(BaseDecl)->
402 hasTrivialConstructor());
403 }
Anders Carlsson072abef2009-04-17 02:34:54 +0000404
405 // C++ [class.ctor]p3:
406 // A destructor is trivial if all the direct base classes of its class
407 // have trivial destructors.
408 Class->setHasTrivialDestructor(cast<CXXRecordDecl>(BaseDecl)->
409 hasTrivialDestructor());
Anders Carlsson347ba892009-04-16 00:08:20 +0000410
Douglas Gregor2943aed2009-03-03 04:44:36 +0000411 // Create the base specifier.
412 // FIXME: Allocate via ASTContext?
413 return new CXXBaseSpecifier(SpecifierRange, Virtual,
414 Class->getTagKind() == RecordDecl::TK_class,
415 Access, BaseType);
416}
417
Douglas Gregore37ac4f2008-04-13 21:30:24 +0000418/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is
419/// one entry in the base class list of a class specifier, for
420/// example:
421/// class foo : public bar, virtual private baz {
422/// 'public bar' and 'virtual private baz' are each base-specifiers.
Douglas Gregorf8268ae2008-10-22 17:49:05 +0000423Sema::BaseResult
Chris Lattnerb28317a2009-03-28 19:18:32 +0000424Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange,
Douglas Gregorf8268ae2008-10-22 17:49:05 +0000425 bool Virtual, AccessSpecifier Access,
426 TypeTy *basetype, SourceLocation BaseLoc) {
Douglas Gregor4c4f7cb2009-06-22 23:20:33 +0000427 if (!classdecl)
428 return true;
429
Douglas Gregor40808ce2009-03-09 23:48:35 +0000430 AdjustDeclIfTemplate(classdecl);
Chris Lattnerb28317a2009-03-28 19:18:32 +0000431 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>());
Douglas Gregor1a51b4a2009-02-09 15:09:02 +0000432 QualType BaseType = QualType::getFromOpaquePtr(basetype);
Douglas Gregor2943aed2009-03-03 04:44:36 +0000433 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange,
434 Virtual, Access,
435 BaseType, BaseLoc))
436 return BaseSpec;
437
438 return true;
Douglas Gregorf8268ae2008-10-22 17:49:05 +0000439}
Douglas Gregore37ac4f2008-04-13 21:30:24 +0000440
Douglas Gregor2943aed2009-03-03 04:44:36 +0000441/// \brief Performs the actual work of attaching the given base class
442/// specifiers to a C++ class.
443bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases,
444 unsigned NumBases) {
445 if (NumBases == 0)
446 return false;
Douglas Gregorf8268ae2008-10-22 17:49:05 +0000447
448 // Used to keep track of which base types we have already seen, so
449 // that we can properly diagnose redundant direct base types. Note
Douglas Gregor57c856b2008-10-23 18:13:27 +0000450 // that the key is always the unqualified canonical type of the base
451 // class.
Douglas Gregorf8268ae2008-10-22 17:49:05 +0000452 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes;
453
454 // Copy non-redundant base specifiers into permanent storage.
Douglas Gregor57c856b2008-10-23 18:13:27 +0000455 unsigned NumGoodBases = 0;
Douglas Gregor2943aed2009-03-03 04:44:36 +0000456 bool Invalid = false;
Douglas Gregor57c856b2008-10-23 18:13:27 +0000457 for (unsigned idx = 0; idx < NumBases; ++idx) {
Douglas Gregorf8268ae2008-10-22 17:49:05 +0000458 QualType NewBaseType
Douglas Gregor2943aed2009-03-03 04:44:36 +0000459 = Context.getCanonicalType(Bases[idx]->getType());
Douglas Gregor57c856b2008-10-23 18:13:27 +0000460 NewBaseType = NewBaseType.getUnqualifiedType();
461
Douglas Gregorf8268ae2008-10-22 17:49:05 +0000462 if (KnownBaseTypes[NewBaseType]) {
463 // C++ [class.mi]p3:
464 // A class shall not be specified as a direct base class of a
465 // derived class more than once.
Douglas Gregor2943aed2009-03-03 04:44:36 +0000466 Diag(Bases[idx]->getSourceRange().getBegin(),
Chris Lattnerfa25bbb2008-11-19 05:08:23 +0000467 diag::err_duplicate_base_class)
Chris Lattnerd1625842008-11-24 06:25:27 +0000468 << KnownBaseTypes[NewBaseType]->getType()
Douglas Gregor2943aed2009-03-03 04:44:36 +0000469 << Bases[idx]->getSourceRange();
Douglas Gregor57c856b2008-10-23 18:13:27 +0000470
471 // Delete the duplicate base class specifier; we're going to
472 // overwrite its pointer later.
Douglas Gregor2943aed2009-03-03 04:44:36 +0000473 delete Bases[idx];
474
475 Invalid = true;
Douglas Gregorf8268ae2008-10-22 17:49:05 +0000476 } else {
477 // Okay, add this new base class.
Douglas Gregor2943aed2009-03-03 04:44:36 +0000478 KnownBaseTypes[NewBaseType] = Bases[idx];
479 Bases[NumGoodBases++] = Bases[idx];
Douglas Gregorf8268ae2008-10-22 17:49:05 +0000480 }
481 }
482
483 // Attach the remaining base class specifiers to the derived class.
Douglas Gregor2943aed2009-03-03 04:44:36 +0000484 Class->setBases(Bases, NumGoodBases);
Douglas Gregor57c856b2008-10-23 18:13:27 +0000485
486 // Delete the remaining (good) base class specifiers, since their
487 // data has been copied into the CXXRecordDecl.
488 for (unsigned idx = 0; idx < NumGoodBases; ++idx)
Douglas Gregor2943aed2009-03-03 04:44:36 +0000489 delete Bases[idx];
490
491 return Invalid;
492}
493
494/// ActOnBaseSpecifiers - Attach the given base specifiers to the
495/// class, after checking whether there are any duplicate base
496/// classes.
Chris Lattnerb28317a2009-03-28 19:18:32 +0000497void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases,
Douglas Gregor2943aed2009-03-03 04:44:36 +0000498 unsigned NumBases) {
499 if (!ClassDecl || !Bases || !NumBases)
500 return;
501
502 AdjustDeclIfTemplate(ClassDecl);
Chris Lattnerb28317a2009-03-28 19:18:32 +0000503 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()),
Douglas Gregor2943aed2009-03-03 04:44:36 +0000504 (CXXBaseSpecifier**)(Bases), NumBases);
Douglas Gregore37ac4f2008-04-13 21:30:24 +0000505}
Argyrios Kyrtzidis2d1c5d32008-04-27 13:50:30 +0000506
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000507//===----------------------------------------------------------------------===//
508// C++ class member Handling
509//===----------------------------------------------------------------------===//
510
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000511/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member
512/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the
513/// bitfield width if there is one and 'InitExpr' specifies the initializer if
Chris Lattnerb6688e02009-04-12 22:37:57 +0000514/// any.
Chris Lattnerb28317a2009-03-28 19:18:32 +0000515Sema::DeclPtrTy
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000516Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D,
Sebastian Redle2b68332009-04-12 17:16:29 +0000517 ExprTy *BW, ExprTy *InitExpr, bool Deleted) {
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000518 const DeclSpec &DS = D.getDeclSpec();
Douglas Gregor10bd3682008-11-17 22:58:34 +0000519 DeclarationName Name = GetNameForDeclarator(D);
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000520 Expr *BitWidth = static_cast<Expr*>(BW);
521 Expr *Init = static_cast<Expr*>(InitExpr);
522 SourceLocation Loc = D.getIdentifierLoc();
523
Sebastian Redl669d5d72008-11-14 23:42:31 +0000524 bool isFunc = D.isFunctionDeclarator();
525
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000526 // C++ 9.2p6: A member shall not be declared to have automatic storage
527 // duration (auto, register) or with the extern storage-class-specifier.
Sebastian Redl669d5d72008-11-14 23:42:31 +0000528 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class
529 // data members and cannot be applied to names declared const or static,
530 // and cannot be applied to reference members.
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000531 switch (DS.getStorageClassSpec()) {
532 case DeclSpec::SCS_unspecified:
533 case DeclSpec::SCS_typedef:
534 case DeclSpec::SCS_static:
535 // FALL THROUGH.
536 break;
Sebastian Redl669d5d72008-11-14 23:42:31 +0000537 case DeclSpec::SCS_mutable:
538 if (isFunc) {
539 if (DS.getStorageClassSpecLoc().isValid())
Chris Lattnerfa25bbb2008-11-19 05:08:23 +0000540 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function);
Sebastian Redl669d5d72008-11-14 23:42:31 +0000541 else
Chris Lattnerfa25bbb2008-11-19 05:08:23 +0000542 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function);
543
Sebastian Redla11f42f2008-11-17 23:24:37 +0000544 // FIXME: It would be nicer if the keyword was ignored only for this
545 // declarator. Otherwise we could get follow-up errors.
Sebastian Redl669d5d72008-11-14 23:42:31 +0000546 D.getMutableDeclSpec().ClearStorageClassSpecs();
547 } else {
548 QualType T = GetTypeForDeclarator(D, S);
549 diag::kind err = static_cast<diag::kind>(0);
550 if (T->isReferenceType())
551 err = diag::err_mutable_reference;
552 else if (T.isConstQualified())
553 err = diag::err_mutable_const;
554 if (err != 0) {
555 if (DS.getStorageClassSpecLoc().isValid())
556 Diag(DS.getStorageClassSpecLoc(), err);
557 else
558 Diag(DS.getThreadSpecLoc(), err);
Sebastian Redla11f42f2008-11-17 23:24:37 +0000559 // FIXME: It would be nicer if the keyword was ignored only for this
560 // declarator. Otherwise we could get follow-up errors.
Sebastian Redl669d5d72008-11-14 23:42:31 +0000561 D.getMutableDeclSpec().ClearStorageClassSpecs();
562 }
563 }
564 break;
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000565 default:
566 if (DS.getStorageClassSpecLoc().isValid())
567 Diag(DS.getStorageClassSpecLoc(),
568 diag::err_storageclass_invalid_for_member);
569 else
570 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member);
571 D.getMutableDeclSpec().ClearStorageClassSpecs();
572 }
573
Argyrios Kyrtzidisd6caa9e2008-10-15 20:23:22 +0000574 if (!isFunc &&
Douglas Gregor1a51b4a2009-02-09 15:09:02 +0000575 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename &&
Argyrios Kyrtzidisd6caa9e2008-10-15 20:23:22 +0000576 D.getNumTypeObjects() == 0) {
Argyrios Kyrtzidisde933f02008-10-08 22:20:31 +0000577 // Check also for this case:
578 //
579 // typedef int f();
580 // f a;
581 //
Douglas Gregor1a51b4a2009-02-09 15:09:02 +0000582 QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep());
583 isFunc = TDType->isFunctionType();
Argyrios Kyrtzidisde933f02008-10-08 22:20:31 +0000584 }
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000585
Sebastian Redl669d5d72008-11-14 23:42:31 +0000586 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified ||
587 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) &&
Argyrios Kyrtzidisde933f02008-10-08 22:20:31 +0000588 !isFunc);
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000589
590 Decl *Member;
Chris Lattner24793662009-03-05 22:45:59 +0000591 if (isInstField) {
Douglas Gregor4dd55f52009-03-11 20:50:30 +0000592 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth,
593 AS);
Chris Lattner6f8ce142009-03-05 23:03:49 +0000594 assert(Member && "HandleField never returns null");
Chris Lattner24793662009-03-05 22:45:59 +0000595 } else {
Chris Lattner682bf922009-03-29 16:50:03 +0000596 Member = ActOnDeclarator(S, D).getAs<Decl>();
Chris Lattner6f8ce142009-03-05 23:03:49 +0000597 if (!Member) {
598 if (BitWidth) DeleteExpr(BitWidth);
Chris Lattner682bf922009-03-29 16:50:03 +0000599 return DeclPtrTy();
Chris Lattner6f8ce142009-03-05 23:03:49 +0000600 }
Chris Lattner8b963ef2009-03-05 23:01:03 +0000601
602 // Non-instance-fields can't have a bitfield.
603 if (BitWidth) {
604 if (Member->isInvalidDecl()) {
605 // don't emit another diagnostic.
Douglas Gregor2d2e9cf2009-03-11 20:22:50 +0000606 } else if (isa<VarDecl>(Member)) {
Chris Lattner8b963ef2009-03-05 23:01:03 +0000607 // C++ 9.6p3: A bit-field shall not be a static member.
608 // "static member 'A' cannot be a bit-field"
609 Diag(Loc, diag::err_static_not_bitfield)
610 << Name << BitWidth->getSourceRange();
611 } else if (isa<TypedefDecl>(Member)) {
612 // "typedef member 'x' cannot be a bit-field"
613 Diag(Loc, diag::err_typedef_not_bitfield)
614 << Name << BitWidth->getSourceRange();
615 } else {
616 // A function typedef ("typedef int f(); f a;").
617 // C++ 9.6p3: A bit-field shall have integral or enumeration type.
618 Diag(Loc, diag::err_not_integral_type_bitfield)
Douglas Gregor3cf538d2009-03-11 18:59:21 +0000619 << Name << cast<ValueDecl>(Member)->getType()
620 << BitWidth->getSourceRange();
Chris Lattner8b963ef2009-03-05 23:01:03 +0000621 }
622
623 DeleteExpr(BitWidth);
624 BitWidth = 0;
625 Member->setInvalidDecl();
626 }
Douglas Gregor4dd55f52009-03-11 20:50:30 +0000627
628 Member->setAccess(AS);
Chris Lattner24793662009-03-05 22:45:59 +0000629 }
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000630
Douglas Gregor10bd3682008-11-17 22:58:34 +0000631 assert((Name || isInstField) && "No identifier for non-field ?");
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000632
Douglas Gregor021c3b32009-03-11 23:00:04 +0000633 if (Init)
Chris Lattnerb28317a2009-03-28 19:18:32 +0000634 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false);
Sebastian Redle2b68332009-04-12 17:16:29 +0000635 if (Deleted) // FIXME: Source location is not very good.
636 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin());
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000637
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000638 if (isInstField) {
Douglas Gregor44b43212008-12-11 16:49:14 +0000639 FieldCollector->Add(cast<FieldDecl>(Member));
Chris Lattner682bf922009-03-29 16:50:03 +0000640 return DeclPtrTy();
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000641 }
Chris Lattnerb28317a2009-03-28 19:18:32 +0000642 return DeclPtrTy::make(Member);
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000643}
644
Douglas Gregor7ad83902008-11-05 04:29:56 +0000645/// ActOnMemInitializer - Handle a C++ member initializer.
646Sema::MemInitResult
Chris Lattnerb28317a2009-03-28 19:18:32 +0000647Sema::ActOnMemInitializer(DeclPtrTy ConstructorD,
Douglas Gregor7ad83902008-11-05 04:29:56 +0000648 Scope *S,
649 IdentifierInfo *MemberOrBase,
650 SourceLocation IdLoc,
651 SourceLocation LParenLoc,
652 ExprTy **Args, unsigned NumArgs,
653 SourceLocation *CommaLocs,
654 SourceLocation RParenLoc) {
Douglas Gregor4c4f7cb2009-06-22 23:20:33 +0000655 if (!ConstructorD)
656 return true;
657
Douglas Gregor7ad83902008-11-05 04:29:56 +0000658 CXXConstructorDecl *Constructor
Chris Lattnerb28317a2009-03-28 19:18:32 +0000659 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>());
Douglas Gregor7ad83902008-11-05 04:29:56 +0000660 if (!Constructor) {
661 // The user wrote a constructor initializer on a function that is
662 // not a C++ constructor. Ignore the error for now, because we may
663 // have more member initializers coming; we'll diagnose it just
664 // once in ActOnMemInitializers.
665 return true;
666 }
667
668 CXXRecordDecl *ClassDecl = Constructor->getParent();
669
670 // C++ [class.base.init]p2:
671 // Names in a mem-initializer-id are looked up in the scope of the
672 // constructor’s class and, if not found in that scope, are looked
673 // up in the scope containing the constructor’s
674 // definition. [Note: if the constructor’s class contains a member
675 // with the same name as a direct or virtual base class of the
676 // class, a mem-initializer-id naming the member or base class and
677 // composed of a single identifier refers to the class member. A
678 // mem-initializer-id for the hidden base class may be specified
679 // using a qualified name. ]
680 // Look for a member, first.
Douglas Gregor44b43212008-12-11 16:49:14 +0000681 FieldDecl *Member = 0;
Douglas Gregor6ab35242009-04-09 21:40:53 +0000682 DeclContext::lookup_result Result
683 = ClassDecl->lookup(Context, MemberOrBase);
Douglas Gregor44b43212008-12-11 16:49:14 +0000684 if (Result.first != Result.second)
685 Member = dyn_cast<FieldDecl>(*Result.first);
Douglas Gregor7ad83902008-11-05 04:29:56 +0000686
687 // FIXME: Handle members of an anonymous union.
688
689 if (Member) {
690 // FIXME: Perform direct initialization of the member.
691 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs);
692 }
693
694 // It didn't name a member, so see if it names a class.
Douglas Gregorb696ea32009-02-04 17:00:24 +0000695 TypeTy *BaseTy = getTypeName(*MemberOrBase, IdLoc, S, 0/*SS*/);
Douglas Gregor7ad83902008-11-05 04:29:56 +0000696 if (!BaseTy)
Chris Lattner3c73c412008-11-19 08:23:25 +0000697 return Diag(IdLoc, diag::err_mem_init_not_member_or_class)
698 << MemberOrBase << SourceRange(IdLoc, RParenLoc);
Douglas Gregor7ad83902008-11-05 04:29:56 +0000699
Douglas Gregor1a51b4a2009-02-09 15:09:02 +0000700 QualType BaseType = QualType::getFromOpaquePtr(BaseTy);
Douglas Gregor7ad83902008-11-05 04:29:56 +0000701 if (!BaseType->isRecordType())
Chris Lattner3c73c412008-11-19 08:23:25 +0000702 return Diag(IdLoc, diag::err_base_init_does_not_name_class)
Chris Lattner08631c52008-11-23 21:45:46 +0000703 << BaseType << SourceRange(IdLoc, RParenLoc);
Douglas Gregor7ad83902008-11-05 04:29:56 +0000704
705 // C++ [class.base.init]p2:
706 // [...] Unless the mem-initializer-id names a nonstatic data
707 // member of the constructor’s class or a direct or virtual base
708 // of that class, the mem-initializer is ill-formed. A
709 // mem-initializer-list can initialize a base class using any
710 // name that denotes that base class type.
711
712 // First, check for a direct base class.
713 const CXXBaseSpecifier *DirectBaseSpec = 0;
714 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin();
715 Base != ClassDecl->bases_end(); ++Base) {
716 if (Context.getCanonicalType(BaseType).getUnqualifiedType() ==
717 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) {
718 // We found a direct base of this type. That's what we're
719 // initializing.
720 DirectBaseSpec = &*Base;
721 break;
722 }
723 }
724
725 // Check for a virtual base class.
Mike Stump390b4cc2009-05-16 07:39:55 +0000726 // FIXME: We might be able to short-circuit this if we know in advance that
727 // there are no virtual bases.
Douglas Gregor7ad83902008-11-05 04:29:56 +0000728 const CXXBaseSpecifier *VirtualBaseSpec = 0;
729 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) {
730 // We haven't found a base yet; search the class hierarchy for a
731 // virtual base class.
732 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
733 /*DetectVirtual=*/false);
734 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) {
735 for (BasePaths::paths_iterator Path = Paths.begin();
736 Path != Paths.end(); ++Path) {
737 if (Path->back().Base->isVirtual()) {
738 VirtualBaseSpec = Path->back().Base;
739 break;
740 }
741 }
742 }
743 }
744
745 // C++ [base.class.init]p2:
746 // If a mem-initializer-id is ambiguous because it designates both
747 // a direct non-virtual base class and an inherited virtual base
748 // class, the mem-initializer is ill-formed.
749 if (DirectBaseSpec && VirtualBaseSpec)
Chris Lattner3c73c412008-11-19 08:23:25 +0000750 return Diag(IdLoc, diag::err_base_init_direct_and_virtual)
751 << MemberOrBase << SourceRange(IdLoc, RParenLoc);
Douglas Gregor7ad83902008-11-05 04:29:56 +0000752
753 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs);
754}
755
Chris Lattnerb28317a2009-03-28 19:18:32 +0000756void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl,
Anders Carlssona7b35212009-03-25 02:58:17 +0000757 SourceLocation ColonLoc,
758 MemInitTy **MemInits, unsigned NumMemInits) {
Douglas Gregor4c4f7cb2009-06-22 23:20:33 +0000759 if (!ConstructorDecl)
760 return;
761
762 CXXConstructorDecl *Constructor
763 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>());
Anders Carlssona7b35212009-03-25 02:58:17 +0000764
765 if (!Constructor) {
766 Diag(ColonLoc, diag::err_only_constructors_take_base_inits);
767 return;
768 }
769}
770
Anders Carlsson67e4dd22009-03-22 01:52:17 +0000771namespace {
772 /// PureVirtualMethodCollector - traverses a class and its superclasses
773 /// and determines if it has any pure virtual methods.
774 class VISIBILITY_HIDDEN PureVirtualMethodCollector {
775 ASTContext &Context;
776
Sebastian Redldfe292d2009-03-22 21:28:55 +0000777 public:
Anders Carlsson67e4dd22009-03-22 01:52:17 +0000778 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList;
Sebastian Redldfe292d2009-03-22 21:28:55 +0000779
780 private:
Anders Carlsson67e4dd22009-03-22 01:52:17 +0000781 MethodList Methods;
782
783 void Collect(const CXXRecordDecl* RD, MethodList& Methods);
784
785 public:
786 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD)
787 : Context(Ctx) {
788
789 MethodList List;
790 Collect(RD, List);
791
792 // Copy the temporary list to methods, and make sure to ignore any
793 // null entries.
794 for (size_t i = 0, e = List.size(); i != e; ++i) {
795 if (List[i])
796 Methods.push_back(List[i]);
797 }
798 }
799
Anders Carlsson4681ebd2009-03-22 20:18:17 +0000800 bool empty() const { return Methods.empty(); }
801
802 MethodList::const_iterator methods_begin() { return Methods.begin(); }
803 MethodList::const_iterator methods_end() { return Methods.end(); }
Anders Carlsson67e4dd22009-03-22 01:52:17 +0000804 };
805
806 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD,
807 MethodList& Methods) {
808 // First, collect the pure virtual methods for the base classes.
809 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(),
810 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) {
811 if (const RecordType *RT = Base->getType()->getAsRecordType()) {
Chris Lattner64540d72009-03-29 05:01:10 +0000812 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl());
Anders Carlsson67e4dd22009-03-22 01:52:17 +0000813 if (BaseDecl && BaseDecl->isAbstract())
814 Collect(BaseDecl, Methods);
815 }
816 }
817
818 // Next, zero out any pure virtual methods that this class overrides.
Anders Carlsson8ff8c222009-05-17 00:00:05 +0000819 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy;
820
821 MethodSetTy OverriddenMethods;
822 size_t MethodsSize = Methods.size();
823
824 for (RecordDecl::decl_iterator i = RD->decls_begin(Context),
825 e = RD->decls_end(Context);
826 i != e; ++i) {
827 // Traverse the record, looking for methods.
828 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) {
829 // If the method is pre virtual, add it to the methods vector.
830 if (MD->isPure()) {
831 Methods.push_back(MD);
832 continue;
833 }
834
835 // Otherwise, record all the overridden methods in our set.
836 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(),
837 E = MD->end_overridden_methods(); I != E; ++I) {
838 // Keep track of the overridden methods.
839 OverriddenMethods.insert(*I);
Anders Carlsson67e4dd22009-03-22 01:52:17 +0000840 }
841 }
842 }
843
Anders Carlsson8ff8c222009-05-17 00:00:05 +0000844 // Now go through the methods and zero out all the ones we know are
845 // overridden.
846 for (size_t i = 0, e = MethodsSize; i != e; ++i) {
847 if (OverriddenMethods.count(Methods[i]))
848 Methods[i] = 0;
Anders Carlsson67e4dd22009-03-22 01:52:17 +0000849 }
Anders Carlsson8ff8c222009-05-17 00:00:05 +0000850
Anders Carlsson67e4dd22009-03-22 01:52:17 +0000851 }
852}
Douglas Gregor7ad83902008-11-05 04:29:56 +0000853
Anders Carlsson4681ebd2009-03-22 20:18:17 +0000854bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T,
Anders Carlssone65a3c82009-03-24 17:23:42 +0000855 unsigned DiagID, AbstractDiagSelID SelID,
856 const CXXRecordDecl *CurrentRD) {
Anders Carlsson4681ebd2009-03-22 20:18:17 +0000857
858 if (!getLangOptions().CPlusPlus)
859 return false;
Anders Carlsson11f21a02009-03-23 19:10:31 +0000860
861 if (const ArrayType *AT = Context.getAsArrayType(T))
Anders Carlssone65a3c82009-03-24 17:23:42 +0000862 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID,
863 CurrentRD);
Anders Carlsson5eff73c2009-03-24 01:46:45 +0000864
865 if (const PointerType *PT = T->getAsPointerType()) {
866 // Find the innermost pointer type.
867 while (const PointerType *T = PT->getPointeeType()->getAsPointerType())
868 PT = T;
Anders Carlsson4681ebd2009-03-22 20:18:17 +0000869
Anders Carlsson5eff73c2009-03-24 01:46:45 +0000870 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType()))
Anders Carlssone65a3c82009-03-24 17:23:42 +0000871 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID,
872 CurrentRD);
Anders Carlsson5eff73c2009-03-24 01:46:45 +0000873 }
874
Anders Carlsson4681ebd2009-03-22 20:18:17 +0000875 const RecordType *RT = T->getAsRecordType();
876 if (!RT)
877 return false;
878
879 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl());
880 if (!RD)
881 return false;
882
Anders Carlssone65a3c82009-03-24 17:23:42 +0000883 if (CurrentRD && CurrentRD != RD)
884 return false;
885
Anders Carlsson4681ebd2009-03-22 20:18:17 +0000886 if (!RD->isAbstract())
887 return false;
888
Anders Carlssonb9bbe492009-03-23 17:49:10 +0000889 Diag(Loc, DiagID) << RD->getDeclName() << SelID;
Anders Carlsson4681ebd2009-03-22 20:18:17 +0000890
891 // Check if we've already emitted the list of pure virtual functions for this
892 // class.
893 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD))
894 return true;
895
896 PureVirtualMethodCollector Collector(Context, RD);
897
898 for (PureVirtualMethodCollector::MethodList::const_iterator I =
899 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) {
900 const CXXMethodDecl *MD = *I;
901
902 Diag(MD->getLocation(), diag::note_pure_virtual_function) <<
903 MD->getDeclName();
904 }
905
906 if (!PureVirtualClassDiagSet)
907 PureVirtualClassDiagSet.reset(new RecordDeclSetTy);
908 PureVirtualClassDiagSet->insert(RD);
909
910 return true;
911}
912
Anders Carlsson8211eff2009-03-24 01:19:16 +0000913namespace {
914 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser
915 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> {
916 Sema &SemaRef;
917 CXXRecordDecl *AbstractClass;
918
Anders Carlssone65a3c82009-03-24 17:23:42 +0000919 bool VisitDeclContext(const DeclContext *DC) {
Anders Carlsson8211eff2009-03-24 01:19:16 +0000920 bool Invalid = false;
921
Douglas Gregor6ab35242009-04-09 21:40:53 +0000922 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(SemaRef.Context),
923 E = DC->decls_end(SemaRef.Context); I != E; ++I)
Anders Carlsson8211eff2009-03-24 01:19:16 +0000924 Invalid |= Visit(*I);
Anders Carlssone65a3c82009-03-24 17:23:42 +0000925
Anders Carlsson8211eff2009-03-24 01:19:16 +0000926 return Invalid;
927 }
Anders Carlssone65a3c82009-03-24 17:23:42 +0000928
929 public:
930 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac)
931 : SemaRef(SemaRef), AbstractClass(ac) {
932 Visit(SemaRef.Context.getTranslationUnitDecl());
933 }
Anders Carlsson8211eff2009-03-24 01:19:16 +0000934
Anders Carlssone65a3c82009-03-24 17:23:42 +0000935 bool VisitFunctionDecl(const FunctionDecl *FD) {
936 if (FD->isThisDeclarationADefinition()) {
937 // No need to do the check if we're in a definition, because it requires
938 // that the return/param types are complete.
939 // because that requires
940 return VisitDeclContext(FD);
941 }
942
943 // Check the return type.
944 QualType RTy = FD->getType()->getAsFunctionType()->getResultType();
945 bool Invalid =
946 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy,
947 diag::err_abstract_type_in_decl,
948 Sema::AbstractReturnType,
949 AbstractClass);
950
951 for (FunctionDecl::param_const_iterator I = FD->param_begin(),
952 E = FD->param_end(); I != E; ++I) {
Anders Carlsson8211eff2009-03-24 01:19:16 +0000953 const ParmVarDecl *VD = *I;
954 Invalid |=
955 SemaRef.RequireNonAbstractType(VD->getLocation(),
956 VD->getOriginalType(),
957 diag::err_abstract_type_in_decl,
Anders Carlssone65a3c82009-03-24 17:23:42 +0000958 Sema::AbstractParamType,
959 AbstractClass);
Anders Carlsson8211eff2009-03-24 01:19:16 +0000960 }
961
962 return Invalid;
963 }
Anders Carlssone65a3c82009-03-24 17:23:42 +0000964
965 bool VisitDecl(const Decl* D) {
966 if (const DeclContext *DC = dyn_cast<DeclContext>(D))
967 return VisitDeclContext(DC);
968
969 return false;
970 }
Anders Carlsson8211eff2009-03-24 01:19:16 +0000971 };
972}
973
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000974void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc,
Chris Lattnerb28317a2009-03-28 19:18:32 +0000975 DeclPtrTy TagDecl,
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000976 SourceLocation LBrac,
977 SourceLocation RBrac) {
Douglas Gregor4c4f7cb2009-06-22 23:20:33 +0000978 if (!TagDecl)
979 return;
980
Douglas Gregor42af25f2009-05-11 19:58:34 +0000981 AdjustDeclIfTemplate(TagDecl);
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000982 ActOnFields(S, RLoc, TagDecl,
Chris Lattnerb28317a2009-03-28 19:18:32 +0000983 (DeclPtrTy*)FieldCollector->getCurFields(),
Daniel Dunbar1bfe1c22008-10-03 02:03:53 +0000984 FieldCollector->getCurNumFields(), LBrac, RBrac, 0);
Douglas Gregor2943aed2009-03-03 04:44:36 +0000985
Chris Lattnerb28317a2009-03-28 19:18:32 +0000986 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>());
Anders Carlsson67e4dd22009-03-22 01:52:17 +0000987 if (!RD->isAbstract()) {
988 // Collect all the pure virtual methods and see if this is an abstract
989 // class after all.
990 PureVirtualMethodCollector Collector(Context, RD);
991 if (!Collector.empty())
992 RD->setAbstract(true);
993 }
994
Anders Carlssone65a3c82009-03-24 17:23:42 +0000995 if (RD->isAbstract())
996 AbstractClassUsageDiagnoser(*this, RD);
Anders Carlsson8211eff2009-03-24 01:19:16 +0000997
Anders Carlsson072abef2009-04-17 02:34:54 +0000998 if (RD->hasTrivialConstructor() || RD->hasTrivialDestructor()) {
Anders Carlsson347ba892009-04-16 00:08:20 +0000999 for (RecordDecl::field_iterator i = RD->field_begin(Context),
1000 e = RD->field_end(Context); i != e; ++i) {
1001 // All the nonstatic data members must have trivial constructors.
1002 QualType FTy = i->getType();
1003 while (const ArrayType *AT = Context.getAsArrayType(FTy))
1004 FTy = AT->getElementType();
1005
1006 if (const RecordType *RT = FTy->getAsRecordType()) {
1007 CXXRecordDecl *FieldRD = cast<CXXRecordDecl>(RT->getDecl());
Anders Carlsson072abef2009-04-17 02:34:54 +00001008
1009 if (!FieldRD->hasTrivialConstructor())
Anders Carlsson347ba892009-04-16 00:08:20 +00001010 RD->setHasTrivialConstructor(false);
Anders Carlsson072abef2009-04-17 02:34:54 +00001011 if (!FieldRD->hasTrivialDestructor())
1012 RD->setHasTrivialDestructor(false);
1013
1014 // If RD has neither a trivial constructor nor a trivial destructor
1015 // we don't need to continue checking.
1016 if (!RD->hasTrivialConstructor() && !RD->hasTrivialDestructor())
Anders Carlsson347ba892009-04-16 00:08:20 +00001017 break;
Anders Carlsson347ba892009-04-16 00:08:20 +00001018 }
1019 }
1020 }
1021
Douglas Gregor42af25f2009-05-11 19:58:34 +00001022 if (!RD->isDependentType())
Anders Carlsson67e4dd22009-03-22 01:52:17 +00001023 AddImplicitlyDeclaredMembersToClass(RD);
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +00001024}
1025
Douglas Gregor396b7cd2008-11-03 17:51:48 +00001026/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared
1027/// special functions, such as the default constructor, copy
1028/// constructor, or destructor, to the given C++ class (C++
1029/// [special]p1). This routine can only be executed just before the
1030/// definition of the class is complete.
1031void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) {
Douglas Gregor2e1cd422008-11-17 14:58:09 +00001032 QualType ClassType = Context.getTypeDeclType(ClassDecl);
1033 ClassType = Context.getCanonicalType(ClassType);
1034
Sebastian Redl465226e2009-05-27 22:11:52 +00001035 // FIXME: Implicit declarations have exception specifications, which are
1036 // the union of the specifications of the implicitly called functions.
1037
Douglas Gregor396b7cd2008-11-03 17:51:48 +00001038 if (!ClassDecl->hasUserDeclaredConstructor()) {
1039 // C++ [class.ctor]p5:
1040 // A default constructor for a class X is a constructor of class X
1041 // that can be called without an argument. If there is no
1042 // user-declared constructor for class X, a default constructor is
1043 // implicitly declared. An implicitly-declared default constructor
1044 // is an inline public member of its class.
Douglas Gregor2e1cd422008-11-17 14:58:09 +00001045 DeclarationName Name
1046 = Context.DeclarationNames.getCXXConstructorName(ClassType);
Douglas Gregor396b7cd2008-11-03 17:51:48 +00001047 CXXConstructorDecl *DefaultCon =
1048 CXXConstructorDecl::Create(Context, ClassDecl,
Douglas Gregor2e1cd422008-11-17 14:58:09 +00001049 ClassDecl->getLocation(), Name,
Douglas Gregor396b7cd2008-11-03 17:51:48 +00001050 Context.getFunctionType(Context.VoidTy,
1051 0, 0, false, 0),
1052 /*isExplicit=*/false,
1053 /*isInline=*/true,
1054 /*isImplicitlyDeclared=*/true);
1055 DefaultCon->setAccess(AS_public);
Douglas Gregor6b3945f2009-01-07 19:46:03 +00001056 DefaultCon->setImplicit();
Douglas Gregor6ab35242009-04-09 21:40:53 +00001057 ClassDecl->addDecl(Context, DefaultCon);
Douglas Gregor396b7cd2008-11-03 17:51:48 +00001058 }
1059
1060 if (!ClassDecl->hasUserDeclaredCopyConstructor()) {
1061 // C++ [class.copy]p4:
1062 // If the class definition does not explicitly declare a copy
1063 // constructor, one is declared implicitly.
1064
1065 // C++ [class.copy]p5:
1066 // The implicitly-declared copy constructor for a class X will
1067 // have the form
1068 //
1069 // X::X(const X&)
1070 //
1071 // if
1072 bool HasConstCopyConstructor = true;
1073
1074 // -- each direct or virtual base class B of X has a copy
1075 // constructor whose first parameter is of type const B& or
1076 // const volatile B&, and
1077 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin();
1078 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) {
1079 const CXXRecordDecl *BaseClassDecl
1080 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl());
1081 HasConstCopyConstructor
1082 = BaseClassDecl->hasConstCopyConstructor(Context);
1083 }
1084
1085 // -- for all the nonstatic data members of X that are of a
1086 // class type M (or array thereof), each such class type
1087 // has a copy constructor whose first parameter is of type
1088 // const M& or const volatile M&.
Douglas Gregor6ab35242009-04-09 21:40:53 +00001089 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context);
1090 HasConstCopyConstructor && Field != ClassDecl->field_end(Context);
1091 ++Field) {
Douglas Gregor396b7cd2008-11-03 17:51:48 +00001092 QualType FieldType = (*Field)->getType();
1093 if (const ArrayType *Array = Context.getAsArrayType(FieldType))
1094 FieldType = Array->getElementType();
1095 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) {
1096 const CXXRecordDecl *FieldClassDecl
1097 = cast<CXXRecordDecl>(FieldClassType->getDecl());
1098 HasConstCopyConstructor
1099 = FieldClassDecl->hasConstCopyConstructor(Context);
1100 }
1101 }
1102
Sebastian Redl64b45f72009-01-05 20:52:13 +00001103 // Otherwise, the implicitly declared copy constructor will have
1104 // the form
Douglas Gregor396b7cd2008-11-03 17:51:48 +00001105 //
1106 // X::X(X&)
Sebastian Redl64b45f72009-01-05 20:52:13 +00001107 QualType ArgType = ClassType;
Douglas Gregor396b7cd2008-11-03 17:51:48 +00001108 if (HasConstCopyConstructor)
1109 ArgType = ArgType.withConst();
Sebastian Redl7c80bd62009-03-16 23:22:08 +00001110 ArgType = Context.getLValueReferenceType(ArgType);
Douglas Gregor396b7cd2008-11-03 17:51:48 +00001111
Sebastian Redl64b45f72009-01-05 20:52:13 +00001112 // An implicitly-declared copy constructor is an inline public
1113 // member of its class.
Douglas Gregor2e1cd422008-11-17 14:58:09 +00001114 DeclarationName Name
1115 = Context.DeclarationNames.getCXXConstructorName(ClassType);
Douglas Gregor396b7cd2008-11-03 17:51:48 +00001116 CXXConstructorDecl *CopyConstructor
1117 = CXXConstructorDecl::Create(Context, ClassDecl,
Douglas Gregor2e1cd422008-11-17 14:58:09 +00001118 ClassDecl->getLocation(), Name,
Douglas Gregor396b7cd2008-11-03 17:51:48 +00001119 Context.getFunctionType(Context.VoidTy,
1120 &ArgType, 1,
1121 false, 0),
1122 /*isExplicit=*/false,
1123 /*isInline=*/true,
1124 /*isImplicitlyDeclared=*/true);
1125 CopyConstructor->setAccess(AS_public);
Douglas Gregor6b3945f2009-01-07 19:46:03 +00001126 CopyConstructor->setImplicit();
Douglas Gregor396b7cd2008-11-03 17:51:48 +00001127
1128 // Add the parameter to the constructor.
1129 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor,
1130 ClassDecl->getLocation(),
1131 /*IdentifierInfo=*/0,
Douglas Gregor4afa39d2009-01-20 01:17:11 +00001132 ArgType, VarDecl::None, 0);
Ted Kremenekfc767612009-01-14 00:42:25 +00001133 CopyConstructor->setParams(Context, &FromParam, 1);
Douglas Gregor6ab35242009-04-09 21:40:53 +00001134 ClassDecl->addDecl(Context, CopyConstructor);
Douglas Gregor396b7cd2008-11-03 17:51:48 +00001135 }
1136
Sebastian Redl64b45f72009-01-05 20:52:13 +00001137 if (!ClassDecl->hasUserDeclaredCopyAssignment()) {
1138 // Note: The following rules are largely analoguous to the copy
1139 // constructor rules. Note that virtual bases are not taken into account
1140 // for determining the argument type of the operator. Note also that
1141 // operators taking an object instead of a reference are allowed.
1142 //
1143 // C++ [class.copy]p10:
1144 // If the class definition does not explicitly declare a copy
1145 // assignment operator, one is declared implicitly.
1146 // The implicitly-defined copy assignment operator for a class X
1147 // will have the form
1148 //
1149 // X& X::operator=(const X&)
1150 //
1151 // if
1152 bool HasConstCopyAssignment = true;
1153
1154 // -- each direct base class B of X has a copy assignment operator
1155 // whose parameter is of type const B&, const volatile B& or B,
1156 // and
1157 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin();
1158 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) {
1159 const CXXRecordDecl *BaseClassDecl
1160 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl());
1161 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context);
1162 }
1163
1164 // -- for all the nonstatic data members of X that are of a class
1165 // type M (or array thereof), each such class type has a copy
1166 // assignment operator whose parameter is of type const M&,
1167 // const volatile M& or M.
Douglas Gregor6ab35242009-04-09 21:40:53 +00001168 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context);
1169 HasConstCopyAssignment && Field != ClassDecl->field_end(Context);
1170 ++Field) {
Sebastian Redl64b45f72009-01-05 20:52:13 +00001171 QualType FieldType = (*Field)->getType();
1172 if (const ArrayType *Array = Context.getAsArrayType(FieldType))
1173 FieldType = Array->getElementType();
1174 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) {
1175 const CXXRecordDecl *FieldClassDecl
1176 = cast<CXXRecordDecl>(FieldClassType->getDecl());
1177 HasConstCopyAssignment
1178 = FieldClassDecl->hasConstCopyAssignment(Context);
1179 }
1180 }
1181
1182 // Otherwise, the implicitly declared copy assignment operator will
1183 // have the form
1184 //
1185 // X& X::operator=(X&)
1186 QualType ArgType = ClassType;
Sebastian Redl7c80bd62009-03-16 23:22:08 +00001187 QualType RetType = Context.getLValueReferenceType(ArgType);
Sebastian Redl64b45f72009-01-05 20:52:13 +00001188 if (HasConstCopyAssignment)
1189 ArgType = ArgType.withConst();
Sebastian Redl7c80bd62009-03-16 23:22:08 +00001190 ArgType = Context.getLValueReferenceType(ArgType);
Sebastian Redl64b45f72009-01-05 20:52:13 +00001191
1192 // An implicitly-declared copy assignment operator is an inline public
1193 // member of its class.
1194 DeclarationName Name =
1195 Context.DeclarationNames.getCXXOperatorName(OO_Equal);
1196 CXXMethodDecl *CopyAssignment =
1197 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name,
1198 Context.getFunctionType(RetType, &ArgType, 1,
1199 false, 0),
Douglas Gregor4afa39d2009-01-20 01:17:11 +00001200 /*isStatic=*/false, /*isInline=*/true);
Sebastian Redl64b45f72009-01-05 20:52:13 +00001201 CopyAssignment->setAccess(AS_public);
Douglas Gregor6b3945f2009-01-07 19:46:03 +00001202 CopyAssignment->setImplicit();
Sebastian Redl64b45f72009-01-05 20:52:13 +00001203
1204 // Add the parameter to the operator.
1205 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment,
1206 ClassDecl->getLocation(),
1207 /*IdentifierInfo=*/0,
Douglas Gregor4afa39d2009-01-20 01:17:11 +00001208 ArgType, VarDecl::None, 0);
Ted Kremenekfc767612009-01-14 00:42:25 +00001209 CopyAssignment->setParams(Context, &FromParam, 1);
Sebastian Redl64b45f72009-01-05 20:52:13 +00001210
1211 // Don't call addedAssignmentOperator. There is no way to distinguish an
1212 // implicit from an explicit assignment operator.
Douglas Gregor6ab35242009-04-09 21:40:53 +00001213 ClassDecl->addDecl(Context, CopyAssignment);
Sebastian Redl64b45f72009-01-05 20:52:13 +00001214 }
1215
Douglas Gregor9e7d9de2008-12-15 21:24:18 +00001216 if (!ClassDecl->hasUserDeclaredDestructor()) {
Douglas Gregor42a552f2008-11-05 20:51:48 +00001217 // C++ [class.dtor]p2:
1218 // If a class has no user-declared destructor, a destructor is
1219 // declared implicitly. An implicitly-declared destructor is an
1220 // inline public member of its class.
Douglas Gregor2e1cd422008-11-17 14:58:09 +00001221 DeclarationName Name
1222 = Context.DeclarationNames.getCXXDestructorName(ClassType);
Douglas Gregor42a552f2008-11-05 20:51:48 +00001223 CXXDestructorDecl *Destructor
1224 = CXXDestructorDecl::Create(Context, ClassDecl,
Douglas Gregor2e1cd422008-11-17 14:58:09 +00001225 ClassDecl->getLocation(), Name,
Douglas Gregor42a552f2008-11-05 20:51:48 +00001226 Context.getFunctionType(Context.VoidTy,
1227 0, 0, false, 0),
1228 /*isInline=*/true,
1229 /*isImplicitlyDeclared=*/true);
1230 Destructor->setAccess(AS_public);
Douglas Gregor6b3945f2009-01-07 19:46:03 +00001231 Destructor->setImplicit();
Douglas Gregor6ab35242009-04-09 21:40:53 +00001232 ClassDecl->addDecl(Context, Destructor);
Douglas Gregor42a552f2008-11-05 20:51:48 +00001233 }
Douglas Gregor396b7cd2008-11-03 17:51:48 +00001234}
1235
Douglas Gregor6569d682009-05-27 23:11:45 +00001236void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) {
1237 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>();
1238 if (!Template)
1239 return;
1240
1241 TemplateParameterList *Params = Template->getTemplateParameters();
1242 for (TemplateParameterList::iterator Param = Params->begin(),
1243 ParamEnd = Params->end();
1244 Param != ParamEnd; ++Param) {
1245 NamedDecl *Named = cast<NamedDecl>(*Param);
1246 if (Named->getDeclName()) {
1247 S->AddDecl(DeclPtrTy::make(Named));
1248 IdResolver.AddDecl(Named);
1249 }
1250 }
1251}
1252
Douglas Gregor72b505b2008-12-16 21:30:33 +00001253/// ActOnStartDelayedCXXMethodDeclaration - We have completed
1254/// parsing a top-level (non-nested) C++ class, and we are now
1255/// parsing those parts of the given Method declaration that could
1256/// not be parsed earlier (C++ [class.mem]p2), such as default
1257/// arguments. This action should enter the scope of the given
1258/// Method declaration as if we had just parsed the qualified method
1259/// name. However, it should not bring the parameters into scope;
1260/// that will be performed by ActOnDelayedCXXMethodParameter.
Chris Lattnerb28317a2009-03-28 19:18:32 +00001261void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) {
Douglas Gregor4c4f7cb2009-06-22 23:20:33 +00001262 if (!MethodD)
1263 return;
1264
Douglas Gregor72b505b2008-12-16 21:30:33 +00001265 CXXScopeSpec SS;
Chris Lattnerb28317a2009-03-28 19:18:32 +00001266 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>());
Douglas Gregorab452ba2009-03-26 23:50:42 +00001267 QualType ClassTy
1268 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext()));
1269 SS.setScopeRep(
1270 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr()));
Douglas Gregor72b505b2008-12-16 21:30:33 +00001271 ActOnCXXEnterDeclaratorScope(S, SS);
1272}
1273
1274/// ActOnDelayedCXXMethodParameter - We've already started a delayed
1275/// C++ method declaration. We're (re-)introducing the given
1276/// function parameter into scope for use in parsing later parts of
1277/// the method declaration. For example, we could see an
1278/// ActOnParamDefaultArgument event for this parameter.
Chris Lattnerb28317a2009-03-28 19:18:32 +00001279void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) {
Douglas Gregor4c4f7cb2009-06-22 23:20:33 +00001280 if (!ParamD)
1281 return;
1282
Chris Lattnerb28317a2009-03-28 19:18:32 +00001283 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>());
Douglas Gregor61366e92008-12-24 00:01:03 +00001284
1285 // If this parameter has an unparsed default argument, clear it out
1286 // to make way for the parsed default argument.
1287 if (Param->hasUnparsedDefaultArg())
1288 Param->setDefaultArg(0);
1289
Chris Lattnerb28317a2009-03-28 19:18:32 +00001290 S->AddDecl(DeclPtrTy::make(Param));
Douglas Gregor72b505b2008-12-16 21:30:33 +00001291 if (Param->getDeclName())
1292 IdResolver.AddDecl(Param);
1293}
1294
1295/// ActOnFinishDelayedCXXMethodDeclaration - We have finished
1296/// processing the delayed method declaration for Method. The method
1297/// declaration is now considered finished. There may be a separate
1298/// ActOnStartOfFunctionDef action later (not necessarily
1299/// immediately!) for this method, if it was also defined inside the
1300/// class body.
Chris Lattnerb28317a2009-03-28 19:18:32 +00001301void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) {
Douglas Gregor4c4f7cb2009-06-22 23:20:33 +00001302 if (!MethodD)
1303 return;
1304
Chris Lattnerb28317a2009-03-28 19:18:32 +00001305 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>());
Douglas Gregor72b505b2008-12-16 21:30:33 +00001306 CXXScopeSpec SS;
Douglas Gregorab452ba2009-03-26 23:50:42 +00001307 QualType ClassTy
1308 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext()));
1309 SS.setScopeRep(
1310 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr()));
Douglas Gregor72b505b2008-12-16 21:30:33 +00001311 ActOnCXXExitDeclaratorScope(S, SS);
1312
1313 // Now that we have our default arguments, check the constructor
1314 // again. It could produce additional diagnostics or affect whether
1315 // the class has implicitly-declared destructors, among other
1316 // things.
Chris Lattner6e475012009-04-25 08:35:12 +00001317 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method))
1318 CheckConstructor(Constructor);
Douglas Gregor72b505b2008-12-16 21:30:33 +00001319
1320 // Check the default arguments, which we may have added.
1321 if (!Method->isInvalidDecl())
1322 CheckCXXDefaultArguments(Method);
1323}
1324
Douglas Gregor42a552f2008-11-05 20:51:48 +00001325/// CheckConstructorDeclarator - Called by ActOnDeclarator to check
Douglas Gregor72b505b2008-12-16 21:30:33 +00001326/// the well-formedness of the constructor declarator @p D with type @p
Douglas Gregor42a552f2008-11-05 20:51:48 +00001327/// R. If there are any errors in the declarator, this routine will
Chris Lattner65401802009-04-25 08:28:21 +00001328/// emit diagnostics and set the invalid bit to true. In any case, the type
1329/// will be updated to reflect a well-formed type for the constructor and
1330/// returned.
1331QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R,
1332 FunctionDecl::StorageClass &SC) {
Douglas Gregor42a552f2008-11-05 20:51:48 +00001333 bool isVirtual = D.getDeclSpec().isVirtualSpecified();
Douglas Gregor42a552f2008-11-05 20:51:48 +00001334
1335 // C++ [class.ctor]p3:
1336 // A constructor shall not be virtual (10.3) or static (9.4). A
1337 // constructor can be invoked for a const, volatile or const
1338 // volatile object. A constructor shall not be declared const,
1339 // volatile, or const volatile (9.3.2).
1340 if (isVirtual) {
Chris Lattner65401802009-04-25 08:28:21 +00001341 if (!D.isInvalidType())
1342 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
1343 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc())
1344 << SourceRange(D.getIdentifierLoc());
1345 D.setInvalidType();
Douglas Gregor42a552f2008-11-05 20:51:48 +00001346 }
1347 if (SC == FunctionDecl::Static) {
Chris Lattner65401802009-04-25 08:28:21 +00001348 if (!D.isInvalidType())
1349 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
1350 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
1351 << SourceRange(D.getIdentifierLoc());
1352 D.setInvalidType();
Douglas Gregor42a552f2008-11-05 20:51:48 +00001353 SC = FunctionDecl::None;
1354 }
Chris Lattner65401802009-04-25 08:28:21 +00001355
1356 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun;
1357 if (FTI.TypeQuals != 0) {
Douglas Gregor42a552f2008-11-05 20:51:48 +00001358 if (FTI.TypeQuals & QualType::Const)
Chris Lattnerfa25bbb2008-11-19 05:08:23 +00001359 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
1360 << "const" << SourceRange(D.getIdentifierLoc());
Douglas Gregor42a552f2008-11-05 20:51:48 +00001361 if (FTI.TypeQuals & QualType::Volatile)
Chris Lattnerfa25bbb2008-11-19 05:08:23 +00001362 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
1363 << "volatile" << SourceRange(D.getIdentifierLoc());
Douglas Gregor42a552f2008-11-05 20:51:48 +00001364 if (FTI.TypeQuals & QualType::Restrict)
Chris Lattnerfa25bbb2008-11-19 05:08:23 +00001365 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
1366 << "restrict" << SourceRange(D.getIdentifierLoc());
Douglas Gregor42a552f2008-11-05 20:51:48 +00001367 }
1368
1369 // Rebuild the function type "R" without any type qualifiers (in
1370 // case any of the errors above fired) and with "void" as the
1371 // return type, since constructors don't have return types. We
1372 // *always* have to do this, because GetTypeForDeclarator will
1373 // put in a result type of "int" when none was specified.
Douglas Gregor72564e72009-02-26 23:50:07 +00001374 const FunctionProtoType *Proto = R->getAsFunctionProtoType();
Chris Lattner65401802009-04-25 08:28:21 +00001375 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(),
1376 Proto->getNumArgs(),
1377 Proto->isVariadic(), 0);
Douglas Gregor42a552f2008-11-05 20:51:48 +00001378}
1379
Douglas Gregor72b505b2008-12-16 21:30:33 +00001380/// CheckConstructor - Checks a fully-formed constructor for
1381/// well-formedness, issuing any diagnostics required. Returns true if
1382/// the constructor declarator is invalid.
Chris Lattner6e475012009-04-25 08:35:12 +00001383void Sema::CheckConstructor(CXXConstructorDecl *Constructor) {
Douglas Gregor33297562009-03-27 04:38:56 +00001384 CXXRecordDecl *ClassDecl
1385 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext());
1386 if (!ClassDecl)
Chris Lattner6e475012009-04-25 08:35:12 +00001387 return Constructor->setInvalidDecl();
Douglas Gregor72b505b2008-12-16 21:30:33 +00001388
1389 // C++ [class.copy]p3:
1390 // A declaration of a constructor for a class X is ill-formed if
1391 // its first parameter is of type (optionally cv-qualified) X and
1392 // either there are no other parameters or else all other
1393 // parameters have default arguments.
Douglas Gregor33297562009-03-27 04:38:56 +00001394 if (!Constructor->isInvalidDecl() &&
1395 ((Constructor->getNumParams() == 1) ||
1396 (Constructor->getNumParams() > 1 &&
Anders Carlssonae0b4e72009-06-06 04:14:07 +00001397 Constructor->getParamDecl(1)->hasDefaultArg()))) {
Douglas Gregor72b505b2008-12-16 21:30:33 +00001398 QualType ParamType = Constructor->getParamDecl(0)->getType();
1399 QualType ClassTy = Context.getTagDeclType(ClassDecl);
1400 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) {
Douglas Gregora3a83512009-04-01 23:51:29 +00001401 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation();
1402 Diag(ParamLoc, diag::err_constructor_byvalue_arg)
Douglas Gregor558cb562009-04-02 01:08:08 +00001403 << CodeModificationHint::CreateInsertion(ParamLoc, " const &");
Chris Lattner6e475012009-04-25 08:35:12 +00001404 Constructor->setInvalidDecl();
Douglas Gregor72b505b2008-12-16 21:30:33 +00001405 }
1406 }
1407
1408 // Notify the class that we've added a constructor.
1409 ClassDecl->addedConstructor(Context, Constructor);
Douglas Gregor72b505b2008-12-16 21:30:33 +00001410}
1411
Anders Carlsson7786d1c2009-04-30 23:18:11 +00001412static inline bool
1413FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) {
1414 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 &&
1415 FTI.ArgInfo[0].Param &&
1416 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType());
1417}
1418
Douglas Gregor42a552f2008-11-05 20:51:48 +00001419/// CheckDestructorDeclarator - Called by ActOnDeclarator to check
1420/// the well-formednes of the destructor declarator @p D with type @p
1421/// R. If there are any errors in the declarator, this routine will
Chris Lattner65401802009-04-25 08:28:21 +00001422/// emit diagnostics and set the declarator to invalid. Even if this happens,
1423/// will be updated to reflect a well-formed type for the destructor and
1424/// returned.
1425QualType Sema::CheckDestructorDeclarator(Declarator &D,
1426 FunctionDecl::StorageClass& SC) {
Douglas Gregor42a552f2008-11-05 20:51:48 +00001427 // C++ [class.dtor]p1:
1428 // [...] A typedef-name that names a class is a class-name
1429 // (7.1.3); however, a typedef-name that names a class shall not
1430 // be used as the identifier in the declarator for a destructor
1431 // declaration.
Douglas Gregor1a51b4a2009-02-09 15:09:02 +00001432 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType());
Chris Lattner65401802009-04-25 08:28:21 +00001433 if (isa<TypedefType>(DeclaratorType)) {
1434 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name)
Douglas Gregor1a51b4a2009-02-09 15:09:02 +00001435 << DeclaratorType;
Chris Lattner65401802009-04-25 08:28:21 +00001436 D.setInvalidType();
Douglas Gregor42a552f2008-11-05 20:51:48 +00001437 }
1438
1439 // C++ [class.dtor]p2:
1440 // A destructor is used to destroy objects of its class type. A
1441 // destructor takes no parameters, and no return type can be
1442 // specified for it (not even void). The address of a destructor
1443 // shall not be taken. A destructor shall not be static. A
1444 // destructor can be invoked for a const, volatile or const
1445 // volatile object. A destructor shall not be declared const,
1446 // volatile or const volatile (9.3.2).
1447 if (SC == FunctionDecl::Static) {
Chris Lattner65401802009-04-25 08:28:21 +00001448 if (!D.isInvalidType())
1449 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be)
1450 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
1451 << SourceRange(D.getIdentifierLoc());
Douglas Gregor42a552f2008-11-05 20:51:48 +00001452 SC = FunctionDecl::None;
Chris Lattner65401802009-04-25 08:28:21 +00001453 D.setInvalidType();
Douglas Gregor42a552f2008-11-05 20:51:48 +00001454 }
Chris Lattner65401802009-04-25 08:28:21 +00001455 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) {
Douglas Gregor42a552f2008-11-05 20:51:48 +00001456 // Destructors don't have return types, but the parser will
1457 // happily parse something like:
1458 //
1459 // class X {
1460 // float ~X();
1461 // };
1462 //
1463 // The return type will be eliminated later.
Chris Lattnerfa25bbb2008-11-19 05:08:23 +00001464 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type)
1465 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
1466 << SourceRange(D.getIdentifierLoc());
Douglas Gregor42a552f2008-11-05 20:51:48 +00001467 }
Chris Lattner65401802009-04-25 08:28:21 +00001468
1469 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun;
1470 if (FTI.TypeQuals != 0 && !D.isInvalidType()) {
Douglas Gregor42a552f2008-11-05 20:51:48 +00001471 if (FTI.TypeQuals & QualType::Const)
Chris Lattnerfa25bbb2008-11-19 05:08:23 +00001472 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
1473 << "const" << SourceRange(D.getIdentifierLoc());
Douglas Gregor42a552f2008-11-05 20:51:48 +00001474 if (FTI.TypeQuals & QualType::Volatile)
Chris Lattnerfa25bbb2008-11-19 05:08:23 +00001475 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
1476 << "volatile" << SourceRange(D.getIdentifierLoc());
Douglas Gregor42a552f2008-11-05 20:51:48 +00001477 if (FTI.TypeQuals & QualType::Restrict)
Chris Lattnerfa25bbb2008-11-19 05:08:23 +00001478 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
1479 << "restrict" << SourceRange(D.getIdentifierLoc());
Chris Lattner65401802009-04-25 08:28:21 +00001480 D.setInvalidType();
Douglas Gregor42a552f2008-11-05 20:51:48 +00001481 }
1482
1483 // Make sure we don't have any parameters.
Anders Carlsson7786d1c2009-04-30 23:18:11 +00001484 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) {
Douglas Gregor42a552f2008-11-05 20:51:48 +00001485 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params);
1486
1487 // Delete the parameters.
Chris Lattner65401802009-04-25 08:28:21 +00001488 FTI.freeArgs();
1489 D.setInvalidType();
Douglas Gregor42a552f2008-11-05 20:51:48 +00001490 }
1491
1492 // Make sure the destructor isn't variadic.
Chris Lattner65401802009-04-25 08:28:21 +00001493 if (FTI.isVariadic) {
Douglas Gregor42a552f2008-11-05 20:51:48 +00001494 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic);
Chris Lattner65401802009-04-25 08:28:21 +00001495 D.setInvalidType();
1496 }
Douglas Gregor42a552f2008-11-05 20:51:48 +00001497
1498 // Rebuild the function type "R" without any type qualifiers or
1499 // parameters (in case any of the errors above fired) and with
1500 // "void" as the return type, since destructors don't have return
1501 // types. We *always* have to do this, because GetTypeForDeclarator
1502 // will put in a result type of "int" when none was specified.
Chris Lattner65401802009-04-25 08:28:21 +00001503 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0);
Douglas Gregor42a552f2008-11-05 20:51:48 +00001504}
1505
Douglas Gregor2f1bc522008-11-07 20:08:42 +00001506/// CheckConversionDeclarator - Called by ActOnDeclarator to check the
1507/// well-formednes of the conversion function declarator @p D with
1508/// type @p R. If there are any errors in the declarator, this routine
1509/// will emit diagnostics and return true. Otherwise, it will return
1510/// false. Either way, the type @p R will be updated to reflect a
1511/// well-formed type for the conversion operator.
Chris Lattner6e475012009-04-25 08:35:12 +00001512void Sema::CheckConversionDeclarator(Declarator &D, QualType &R,
Douglas Gregor2f1bc522008-11-07 20:08:42 +00001513 FunctionDecl::StorageClass& SC) {
Douglas Gregor2f1bc522008-11-07 20:08:42 +00001514 // C++ [class.conv.fct]p1:
1515 // Neither parameter types nor return type can be specified. The
1516 // type of a conversion function (8.3.5) is “function taking no
1517 // parameter returning conversion-type-id.”
1518 if (SC == FunctionDecl::Static) {
Chris Lattner6e475012009-04-25 08:35:12 +00001519 if (!D.isInvalidType())
1520 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member)
1521 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
1522 << SourceRange(D.getIdentifierLoc());
1523 D.setInvalidType();
Douglas Gregor2f1bc522008-11-07 20:08:42 +00001524 SC = FunctionDecl::None;
1525 }
Chris Lattner6e475012009-04-25 08:35:12 +00001526 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) {
Douglas Gregor2f1bc522008-11-07 20:08:42 +00001527 // Conversion functions don't have return types, but the parser will
1528 // happily parse something like:
1529 //
1530 // class X {
1531 // float operator bool();
1532 // };
1533 //
1534 // The return type will be changed later anyway.
Chris Lattnerfa25bbb2008-11-19 05:08:23 +00001535 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type)
1536 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
1537 << SourceRange(D.getIdentifierLoc());
Douglas Gregor2f1bc522008-11-07 20:08:42 +00001538 }
1539
1540 // Make sure we don't have any parameters.
Douglas Gregor72564e72009-02-26 23:50:07 +00001541 if (R->getAsFunctionProtoType()->getNumArgs() > 0) {
Douglas Gregor2f1bc522008-11-07 20:08:42 +00001542 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params);
1543
1544 // Delete the parameters.
Chris Lattner1833a832009-01-20 21:06:38 +00001545 D.getTypeObject(0).Fun.freeArgs();
Chris Lattner6e475012009-04-25 08:35:12 +00001546 D.setInvalidType();
Douglas Gregor2f1bc522008-11-07 20:08:42 +00001547 }
1548
1549 // Make sure the conversion function isn't variadic.
Chris Lattner6e475012009-04-25 08:35:12 +00001550 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) {
Douglas Gregor2f1bc522008-11-07 20:08:42 +00001551 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic);
Chris Lattner6e475012009-04-25 08:35:12 +00001552 D.setInvalidType();
1553 }
Douglas Gregor2f1bc522008-11-07 20:08:42 +00001554
1555 // C++ [class.conv.fct]p4:
1556 // The conversion-type-id shall not represent a function type nor
1557 // an array type.
1558 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType());
1559 if (ConvType->isArrayType()) {
1560 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array);
1561 ConvType = Context.getPointerType(ConvType);
Chris Lattner6e475012009-04-25 08:35:12 +00001562 D.setInvalidType();
Douglas Gregor2f1bc522008-11-07 20:08:42 +00001563 } else if (ConvType->isFunctionType()) {
1564 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function);
1565 ConvType = Context.getPointerType(ConvType);
Chris Lattner6e475012009-04-25 08:35:12 +00001566 D.setInvalidType();
Douglas Gregor2f1bc522008-11-07 20:08:42 +00001567 }
1568
1569 // Rebuild the function type "R" without any parameters (in case any
1570 // of the errors above fired) and with the conversion type as the
1571 // return type.
1572 R = Context.getFunctionType(ConvType, 0, 0, false,
Douglas Gregor72564e72009-02-26 23:50:07 +00001573 R->getAsFunctionProtoType()->getTypeQuals());
Douglas Gregor2f1bc522008-11-07 20:08:42 +00001574
Douglas Gregor09f41cf2009-01-14 15:45:31 +00001575 // C++0x explicit conversion operators.
1576 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x)
1577 Diag(D.getDeclSpec().getExplicitSpecLoc(),
1578 diag::warn_explicit_conversion_functions)
1579 << SourceRange(D.getDeclSpec().getExplicitSpecLoc());
Douglas Gregor2f1bc522008-11-07 20:08:42 +00001580}
1581
Douglas Gregor2f1bc522008-11-07 20:08:42 +00001582/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete
1583/// the declaration of the given C++ conversion function. This routine
1584/// is responsible for recording the conversion function in the C++
1585/// class, if possible.
Chris Lattnerb28317a2009-03-28 19:18:32 +00001586Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) {
Douglas Gregor2f1bc522008-11-07 20:08:42 +00001587 assert(Conversion && "Expected to receive a conversion function declaration");
1588
Douglas Gregor9d350972008-12-12 08:25:50 +00001589 // Set the lexical context of this conversion function
1590 Conversion->setLexicalDeclContext(CurContext);
1591
1592 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext());
Douglas Gregor2f1bc522008-11-07 20:08:42 +00001593
1594 // Make sure we aren't redeclaring the conversion function.
1595 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType());
Douglas Gregor2f1bc522008-11-07 20:08:42 +00001596
1597 // C++ [class.conv.fct]p1:
1598 // [...] A conversion function is never used to convert a
1599 // (possibly cv-qualified) object to the (possibly cv-qualified)
1600 // same object type (or a reference to it), to a (possibly
1601 // cv-qualified) base class of that type (or a reference to it),
1602 // or to (possibly cv-qualified) void.
Mike Stump390b4cc2009-05-16 07:39:55 +00001603 // FIXME: Suppress this warning if the conversion function ends up being a
1604 // virtual function that overrides a virtual function in a base class.
Douglas Gregor2f1bc522008-11-07 20:08:42 +00001605 QualType ClassType
1606 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
1607 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType())
1608 ConvType = ConvTypeRef->getPointeeType();
1609 if (ConvType->isRecordType()) {
1610 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType();
1611 if (ConvType == ClassType)
Chris Lattner5dc266a2008-11-20 06:13:02 +00001612 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used)
Chris Lattnerd1625842008-11-24 06:25:27 +00001613 << ClassType;
Douglas Gregor2f1bc522008-11-07 20:08:42 +00001614 else if (IsDerivedFrom(ClassType, ConvType))
Chris Lattner5dc266a2008-11-20 06:13:02 +00001615 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used)
Chris Lattnerd1625842008-11-24 06:25:27 +00001616 << ClassType << ConvType;
Douglas Gregor2f1bc522008-11-07 20:08:42 +00001617 } else if (ConvType->isVoidType()) {
Chris Lattner5dc266a2008-11-20 06:13:02 +00001618 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used)
Chris Lattnerd1625842008-11-24 06:25:27 +00001619 << ClassType << ConvType;
Douglas Gregor2f1bc522008-11-07 20:08:42 +00001620 }
1621
Douglas Gregor70316a02008-12-26 15:00:45 +00001622 if (Conversion->getPreviousDeclaration()) {
1623 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions();
1624 for (OverloadedFunctionDecl::function_iterator
1625 Conv = Conversions->function_begin(),
1626 ConvEnd = Conversions->function_end();
1627 Conv != ConvEnd; ++Conv) {
Douglas Gregore53060f2009-06-25 22:08:12 +00001628 if (*Conv
1629 == cast_or_null<NamedDecl>(Conversion->getPreviousDeclaration())) {
Douglas Gregor70316a02008-12-26 15:00:45 +00001630 *Conv = Conversion;
Chris Lattnerb28317a2009-03-28 19:18:32 +00001631 return DeclPtrTy::make(Conversion);
Douglas Gregor70316a02008-12-26 15:00:45 +00001632 }
1633 }
1634 assert(Conversion->isInvalidDecl() && "Conversion should not get here.");
1635 } else
1636 ClassDecl->addConversionFunction(Context, Conversion);
Douglas Gregor2f1bc522008-11-07 20:08:42 +00001637
Chris Lattnerb28317a2009-03-28 19:18:32 +00001638 return DeclPtrTy::make(Conversion);
Douglas Gregor2f1bc522008-11-07 20:08:42 +00001639}
1640
Argyrios Kyrtzidis2d1c5d32008-04-27 13:50:30 +00001641//===----------------------------------------------------------------------===//
1642// Namespace Handling
1643//===----------------------------------------------------------------------===//
1644
1645/// ActOnStartNamespaceDef - This is called at the start of a namespace
1646/// definition.
Chris Lattnerb28317a2009-03-28 19:18:32 +00001647Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope,
1648 SourceLocation IdentLoc,
1649 IdentifierInfo *II,
1650 SourceLocation LBrace) {
Argyrios Kyrtzidis2d1c5d32008-04-27 13:50:30 +00001651 NamespaceDecl *Namespc =
1652 NamespaceDecl::Create(Context, CurContext, IdentLoc, II);
1653 Namespc->setLBracLoc(LBrace);
1654
1655 Scope *DeclRegionScope = NamespcScope->getParent();
1656
1657 if (II) {
1658 // C++ [namespace.def]p2:
1659 // The identifier in an original-namespace-definition shall not have been
1660 // previously defined in the declarative region in which the
1661 // original-namespace-definition appears. The identifier in an
1662 // original-namespace-definition is the name of the namespace. Subsequently
1663 // in that declarative region, it is treated as an original-namespace-name.
1664
Douglas Gregor47b9a1c2009-02-04 17:27:36 +00001665 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName,
1666 true);
Douglas Gregor44b43212008-12-11 16:49:14 +00001667
1668 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) {
1669 // This is an extended namespace definition.
1670 // Attach this namespace decl to the chain of extended namespace
1671 // definitions.
1672 OrigNS->setNextNamespace(Namespc);
1673 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace());
Argyrios Kyrtzidis2d1c5d32008-04-27 13:50:30 +00001674
Douglas Gregor44b43212008-12-11 16:49:14 +00001675 // Remove the previous declaration from the scope.
Chris Lattnerb28317a2009-03-28 19:18:32 +00001676 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) {
Douglas Gregore267ff32008-12-11 20:41:00 +00001677 IdResolver.RemoveDecl(OrigNS);
Chris Lattnerb28317a2009-03-28 19:18:32 +00001678 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS));
Argyrios Kyrtzidis2d1c5d32008-04-27 13:50:30 +00001679 }
Douglas Gregor44b43212008-12-11 16:49:14 +00001680 } else if (PrevDecl) {
1681 // This is an invalid name redefinition.
1682 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind)
1683 << Namespc->getDeclName();
1684 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
1685 Namespc->setInvalidDecl();
1686 // Continue on to push Namespc as current DeclContext and return it.
1687 }
1688
1689 PushOnScopeChains(Namespc, DeclRegionScope);
1690 } else {
Argyrios Kyrtzidis2d1c5d32008-04-27 13:50:30 +00001691 // FIXME: Handle anonymous namespaces
1692 }
1693
1694 // Although we could have an invalid decl (i.e. the namespace name is a
1695 // redefinition), push it as current DeclContext and try to continue parsing.
Mike Stump390b4cc2009-05-16 07:39:55 +00001696 // FIXME: We should be able to push Namespc here, so that the each DeclContext
1697 // for the namespace has the declarations that showed up in that particular
1698 // namespace definition.
Douglas Gregor44b43212008-12-11 16:49:14 +00001699 PushDeclContext(NamespcScope, Namespc);
Chris Lattnerb28317a2009-03-28 19:18:32 +00001700 return DeclPtrTy::make(Namespc);
Argyrios Kyrtzidis2d1c5d32008-04-27 13:50:30 +00001701}
1702
1703/// ActOnFinishNamespaceDef - This callback is called after a namespace is
1704/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef.
Chris Lattnerb28317a2009-03-28 19:18:32 +00001705void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) {
1706 Decl *Dcl = D.getAs<Decl>();
Argyrios Kyrtzidis2d1c5d32008-04-27 13:50:30 +00001707 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl);
1708 assert(Namespc && "Invalid parameter, expected NamespaceDecl");
1709 Namespc->setRBracLoc(RBrace);
1710 PopDeclContext();
1711}
Argyrios Kyrtzidis73a0d882008-10-06 17:10:33 +00001712
Chris Lattnerb28317a2009-03-28 19:18:32 +00001713Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S,
1714 SourceLocation UsingLoc,
1715 SourceLocation NamespcLoc,
1716 const CXXScopeSpec &SS,
1717 SourceLocation IdentLoc,
1718 IdentifierInfo *NamespcName,
1719 AttributeList *AttrList) {
Douglas Gregorf780abc2008-12-30 03:27:21 +00001720 assert(!SS.isInvalid() && "Invalid CXXScopeSpec.");
1721 assert(NamespcName && "Invalid NamespcName.");
1722 assert(IdentLoc.isValid() && "Invalid NamespceName location.");
Douglas Gregor2a3009a2009-02-03 19:21:40 +00001723 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.");
Douglas Gregorf780abc2008-12-30 03:27:21 +00001724
Douglas Gregor2a3009a2009-02-03 19:21:40 +00001725 UsingDirectiveDecl *UDir = 0;
Douglas Gregorf780abc2008-12-30 03:27:21 +00001726
Douglas Gregoreb11cd02009-01-14 22:20:51 +00001727 // Lookup namespace name.
Douglas Gregor2a3009a2009-02-03 19:21:40 +00001728 LookupResult R = LookupParsedName(S, &SS, NamespcName,
1729 LookupNamespaceName, false);
1730 if (R.isAmbiguous()) {
1731 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc);
Chris Lattnerb28317a2009-03-28 19:18:32 +00001732 return DeclPtrTy();
Douglas Gregor2a3009a2009-02-03 19:21:40 +00001733 }
Douglas Gregor47b9a1c2009-02-04 17:27:36 +00001734 if (NamedDecl *NS = R) {
Douglas Gregorf780abc2008-12-30 03:27:21 +00001735 assert(isa<NamespaceDecl>(NS) && "expected namespace decl");
Douglas Gregor2a3009a2009-02-03 19:21:40 +00001736 // C++ [namespace.udir]p1:
1737 // A using-directive specifies that the names in the nominated
1738 // namespace can be used in the scope in which the
1739 // using-directive appears after the using-directive. During
1740 // unqualified name lookup (3.4.1), the names appear as if they
1741 // were declared in the nearest enclosing namespace which
1742 // contains both the using-directive and the nominated
1743 // namespace. [Note: in this context, “contains” means “contains
1744 // directly or indirectly”. ]
1745
1746 // Find enclosing context containing both using-directive and
1747 // nominated namespace.
1748 DeclContext *CommonAncestor = cast<DeclContext>(NS);
1749 while (CommonAncestor && !CommonAncestor->Encloses(CurContext))
1750 CommonAncestor = CommonAncestor->getParent();
1751
Douglas Gregor8419fa32009-05-30 06:31:56 +00001752 UDir = UsingDirectiveDecl::Create(Context,
1753 CurContext, UsingLoc,
1754 NamespcLoc,
1755 SS.getRange(),
1756 (NestedNameSpecifier *)SS.getScopeRep(),
1757 IdentLoc,
Douglas Gregor2a3009a2009-02-03 19:21:40 +00001758 cast<NamespaceDecl>(NS),
1759 CommonAncestor);
1760 PushUsingDirective(S, UDir);
Douglas Gregorf780abc2008-12-30 03:27:21 +00001761 } else {
Chris Lattneread013e2009-01-06 07:24:29 +00001762 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange();
Douglas Gregorf780abc2008-12-30 03:27:21 +00001763 }
1764
Douglas Gregor2a3009a2009-02-03 19:21:40 +00001765 // FIXME: We ignore attributes for now.
Douglas Gregorf780abc2008-12-30 03:27:21 +00001766 delete AttrList;
Chris Lattnerb28317a2009-03-28 19:18:32 +00001767 return DeclPtrTy::make(UDir);
Douglas Gregor2a3009a2009-02-03 19:21:40 +00001768}
1769
1770void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) {
1771 // If scope has associated entity, then using directive is at namespace
1772 // or translation unit scope. We add UsingDirectiveDecls, into
1773 // it's lookup structure.
1774 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()))
Douglas Gregor6ab35242009-04-09 21:40:53 +00001775 Ctx->addDecl(Context, UDir);
Douglas Gregor2a3009a2009-02-03 19:21:40 +00001776 else
1777 // Otherwise it is block-sope. using-directives will affect lookup
1778 // only to the end of scope.
Chris Lattnerb28317a2009-03-28 19:18:32 +00001779 S->PushUsingDirective(DeclPtrTy::make(UDir));
Douglas Gregorf780abc2008-12-30 03:27:21 +00001780}
Argyrios Kyrtzidis73a0d882008-10-06 17:10:33 +00001781
Douglas Gregor9cfbe482009-06-20 00:51:54 +00001782
1783Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S,
1784 SourceLocation UsingLoc,
1785 const CXXScopeSpec &SS,
1786 SourceLocation IdentLoc,
1787 IdentifierInfo *TargetName,
1788 AttributeList *AttrList,
1789 bool IsTypeName) {
1790 assert(!SS.isInvalid() && "Invalid CXXScopeSpec.");
1791 assert(TargetName && "Invalid TargetName.");
1792 assert(IdentLoc.isValid() && "Invalid TargetName location.");
1793 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.");
1794
1795 UsingDecl *UsingAlias = 0;
1796
1797 // Lookup target name.
1798 LookupResult R = LookupParsedName(S, &SS, TargetName,
1799 LookupOrdinaryName, false);
1800
1801 if (NamedDecl *NS = R) {
1802 if (IsTypeName && !isa<TypeDecl>(NS)) {
1803 Diag(IdentLoc, diag::err_using_typename_non_type);
1804 }
1805 UsingAlias = UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(),
1806 NS->getLocation(), UsingLoc, NS,
1807 static_cast<NestedNameSpecifier *>(SS.getScopeRep()),
1808 IsTypeName);
1809 PushOnScopeChains(UsingAlias, S);
1810 } else {
1811 Diag(IdentLoc, diag::err_using_requires_qualname) << SS.getRange();
1812 }
1813
1814 // FIXME: We ignore attributes for now.
1815 delete AttrList;
1816 return DeclPtrTy::make(UsingAlias);
1817}
1818
Anders Carlsson81c85c42009-03-28 23:53:49 +00001819/// getNamespaceDecl - Returns the namespace a decl represents. If the decl
1820/// is a namespace alias, returns the namespace it points to.
1821static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) {
1822 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D))
1823 return AD->getNamespace();
1824 return dyn_cast_or_null<NamespaceDecl>(D);
1825}
1826
Chris Lattnerb28317a2009-03-28 19:18:32 +00001827Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S,
Anders Carlsson03bd5a12009-03-28 22:53:22 +00001828 SourceLocation NamespaceLoc,
Chris Lattnerb28317a2009-03-28 19:18:32 +00001829 SourceLocation AliasLoc,
1830 IdentifierInfo *Alias,
1831 const CXXScopeSpec &SS,
Anders Carlsson03bd5a12009-03-28 22:53:22 +00001832 SourceLocation IdentLoc,
1833 IdentifierInfo *Ident) {
Anders Carlsson8d7ba402009-03-28 06:23:46 +00001834
Anders Carlsson81c85c42009-03-28 23:53:49 +00001835 // Lookup the namespace name.
1836 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false);
1837
Anders Carlsson8d7ba402009-03-28 06:23:46 +00001838 // Check if we have a previous declaration with the same name.
Anders Carlssondd729fc2009-03-28 23:49:35 +00001839 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) {
Anders Carlsson81c85c42009-03-28 23:53:49 +00001840 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) {
1841 // We already have an alias with the same name that points to the same
1842 // namespace, so don't create a new one.
1843 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R))
1844 return DeclPtrTy();
1845 }
1846
Anders Carlsson8d7ba402009-03-28 06:23:46 +00001847 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition :
1848 diag::err_redefinition_different_kind;
1849 Diag(AliasLoc, DiagID) << Alias;
1850 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
Chris Lattnerb28317a2009-03-28 19:18:32 +00001851 return DeclPtrTy();
Anders Carlsson8d7ba402009-03-28 06:23:46 +00001852 }
1853
Anders Carlsson5721c682009-03-28 06:42:02 +00001854 if (R.isAmbiguous()) {
Anders Carlsson03bd5a12009-03-28 22:53:22 +00001855 DiagnoseAmbiguousLookup(R, Ident, IdentLoc);
Chris Lattnerb28317a2009-03-28 19:18:32 +00001856 return DeclPtrTy();
Anders Carlsson5721c682009-03-28 06:42:02 +00001857 }
1858
1859 if (!R) {
1860 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange();
Chris Lattnerb28317a2009-03-28 19:18:32 +00001861 return DeclPtrTy();
Anders Carlsson5721c682009-03-28 06:42:02 +00001862 }
1863
Fariborz Jahanianf8dcb862009-06-19 19:55:27 +00001864 NamespaceAliasDecl *AliasDecl =
Douglas Gregor6c9c9402009-05-30 06:48:27 +00001865 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc,
1866 Alias, SS.getRange(),
1867 (NestedNameSpecifier *)SS.getScopeRep(),
Anders Carlsson68771c72009-03-28 22:58:02 +00001868 IdentLoc, R);
1869
Douglas Gregor6ab35242009-04-09 21:40:53 +00001870 CurContext->addDecl(Context, AliasDecl);
Anders Carlsson68771c72009-03-28 22:58:02 +00001871 return DeclPtrTy::make(AliasDecl);
Anders Carlssondbb00942009-03-28 05:27:17 +00001872}
1873
Fariborz Jahanianf8dcb862009-06-19 19:55:27 +00001874void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation,
1875 CXXConstructorDecl *Constructor) {
Fariborz Jahanian05a5c452009-06-22 20:37:23 +00001876 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() &&
1877 !Constructor->isUsed()) &&
1878 "DefineImplicitDefaultConstructor - call it for implicit default ctor");
Fariborz Jahanianf8dcb862009-06-19 19:55:27 +00001879
1880 CXXRecordDecl *ClassDecl
1881 = cast<CXXRecordDecl>(Constructor->getDeclContext());
Fariborz Jahanian485f0872009-06-22 23:34:40 +00001882 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor");
Fariborz Jahanianf8dcb862009-06-19 19:55:27 +00001883 // Before the implicitly-declared default constructor for a class is
1884 // implicitly defined, all the implicitly-declared default constructors
1885 // for its base class and its non-static data members shall have been
1886 // implicitly defined.
1887 bool err = false;
1888 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin();
1889 Base != ClassDecl->bases_end(); ++Base) {
1890 CXXRecordDecl *BaseClassDecl
1891 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl());
1892 if (!BaseClassDecl->hasTrivialConstructor()) {
1893 if (CXXConstructorDecl *BaseCtor =
Fariborz Jahanian220a0f32009-06-23 23:42:10 +00001894 BaseClassDecl->getDefaultConstructor(Context))
1895 MarkDeclarationReferenced(CurrentLocation, BaseCtor);
Fariborz Jahanianf8dcb862009-06-19 19:55:27 +00001896 else {
1897 Diag(CurrentLocation, diag::err_defining_default_ctor)
Fariborz Jahanian3da83eb2009-06-20 20:23:38 +00001898 << Context.getTagDeclType(ClassDecl) << 1
1899 << Context.getTagDeclType(BaseClassDecl);
1900 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl)
1901 << Context.getTagDeclType(BaseClassDecl);
Fariborz Jahanianf8dcb862009-06-19 19:55:27 +00001902 err = true;
1903 }
1904 }
1905 }
1906 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context);
1907 Field != ClassDecl->field_end(Context);
1908 ++Field) {
1909 QualType FieldType = Context.getCanonicalType((*Field)->getType());
1910 if (const ArrayType *Array = Context.getAsArrayType(FieldType))
1911 FieldType = Array->getElementType();
1912 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) {
1913 CXXRecordDecl *FieldClassDecl
1914 = cast<CXXRecordDecl>(FieldClassType->getDecl());
Duncan Sands6887e632009-06-25 09:03:06 +00001915 if (!FieldClassDecl->hasTrivialConstructor()) {
Fariborz Jahanianf8dcb862009-06-19 19:55:27 +00001916 if (CXXConstructorDecl *FieldCtor =
Fariborz Jahanian220a0f32009-06-23 23:42:10 +00001917 FieldClassDecl->getDefaultConstructor(Context))
1918 MarkDeclarationReferenced(CurrentLocation, FieldCtor);
Fariborz Jahanianf8dcb862009-06-19 19:55:27 +00001919 else {
1920 Diag(CurrentLocation, diag::err_defining_default_ctor)
Fariborz Jahanian3da83eb2009-06-20 20:23:38 +00001921 << Context.getTagDeclType(ClassDecl) << 0 <<
1922 Context.getTagDeclType(FieldClassDecl);
1923 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl)
1924 << Context.getTagDeclType(FieldClassDecl);
Fariborz Jahanianf8dcb862009-06-19 19:55:27 +00001925 err = true;
1926 }
1927 }
Duncan Sands6887e632009-06-25 09:03:06 +00001928 }
Fariborz Jahanianf8dcb862009-06-19 19:55:27 +00001929 else if (FieldType->isReferenceType()) {
1930 Diag(CurrentLocation, diag::err_unintialized_member)
Fariborz Jahanian3da83eb2009-06-20 20:23:38 +00001931 << Context.getTagDeclType(ClassDecl) << 0 << (*Field)->getNameAsCString();
Fariborz Jahanianf8dcb862009-06-19 19:55:27 +00001932 Diag((*Field)->getLocation(), diag::note_declared_at);
1933 err = true;
1934 }
1935 else if (FieldType.isConstQualified()) {
1936 Diag(CurrentLocation, diag::err_unintialized_member)
Fariborz Jahanian3da83eb2009-06-20 20:23:38 +00001937 << Context.getTagDeclType(ClassDecl) << 1 << (*Field)->getNameAsCString();
Fariborz Jahanianf8dcb862009-06-19 19:55:27 +00001938 Diag((*Field)->getLocation(), diag::note_declared_at);
1939 err = true;
1940 }
1941 }
1942 if (!err)
Fariborz Jahanianb7f4cc02009-06-22 17:30:33 +00001943 Constructor->setUsed();
Fariborz Jahanianf8dcb862009-06-19 19:55:27 +00001944}
1945
Fariborz Jahanianc75bc2d2009-06-25 21:45:19 +00001946void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation,
1947 CXXMethodDecl *MethodDecl) {
1948 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() &&
1949 MethodDecl->getOverloadedOperator() == OO_Equal &&
1950 !MethodDecl->isUsed()) &&
1951 "DefineImplicitOverloadedAssign - call it for implicit assignment op");
1952
1953 CXXRecordDecl *ClassDecl
1954 = cast<CXXRecordDecl>(MethodDecl->getDeclContext());
1955 assert(ClassDecl && "DefineImplicitOverloadedAssign - invalid constructor");
1956
1957 // C++[class.copy] p210
1958 // Before the implicitly-declared copy assignment operator for a class is
1959 // implicitly defined, all implicitly-declared copy assignment operators
1960 // for its direct base classes and its nonstatic data members shall have
1961 // been implicitly defined.
1962 bool err = false;
1963 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin();
1964 Base != ClassDecl->bases_end(); ++Base) {
1965 CXXRecordDecl *BaseClassDecl
1966 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl());
1967 if (CXXMethodDecl *BaseAssignOpMethod =
1968 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl))
1969 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod);
1970 }
1971 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context);
1972 Field != ClassDecl->field_end(Context);
1973 ++Field) {
1974 QualType FieldType = Context.getCanonicalType((*Field)->getType());
1975 if (const ArrayType *Array = Context.getAsArrayType(FieldType))
1976 FieldType = Array->getElementType();
1977 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) {
1978 CXXRecordDecl *FieldClassDecl
1979 = cast<CXXRecordDecl>(FieldClassType->getDecl());
1980 if (CXXMethodDecl *FieldAssignOpMethod =
1981 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl))
1982 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod);
1983 }
1984 else if (FieldType->isReferenceType()) {
1985 Diag(ClassDecl->getLocation(), diag::err_unintialized_member_for_assign)
1986 << Context.getTagDeclType(ClassDecl) << 0 << (*Field)->getNameAsCString();
1987 Diag((*Field)->getLocation(), diag::note_declared_at);
1988 Diag(CurrentLocation, diag::note_first_required_here);
1989 err = true;
1990 }
1991 else if (FieldType.isConstQualified()) {
1992 Diag(ClassDecl->getLocation(), diag::err_unintialized_member_for_assign)
1993 << Context.getTagDeclType(ClassDecl) << 1 << (*Field)->getNameAsCString();
1994 Diag((*Field)->getLocation(), diag::note_declared_at);
1995 Diag(CurrentLocation, diag::note_first_required_here);
1996 err = true;
1997 }
1998 }
1999 if (!err)
2000 MethodDecl->setUsed();
2001}
2002
2003CXXMethodDecl *
2004Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl,
2005 CXXRecordDecl *ClassDecl) {
2006 QualType LHSType = Context.getTypeDeclType(ClassDecl);
2007 QualType RHSType(LHSType);
2008 // If class's assignment operator argument is const/volatile qualified,
2009 // look for operator = (const/volatile B&). Otherwise, look for
2010 // operator = (B&).
2011 if (ParmDecl->getType().isConstQualified())
2012 RHSType.addConst();
2013 if (ParmDecl->getType().isVolatileQualified())
2014 RHSType.addVolatile();
2015 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl,
2016 LHSType,
2017 SourceLocation()));
2018 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl,
2019 RHSType,
2020 SourceLocation()));
2021 Expr *Args[2] = { &*LHS, &*RHS };
2022 OverloadCandidateSet CandidateSet;
2023 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2,
2024 CandidateSet);
2025 OverloadCandidateSet::iterator Best;
2026 if (BestViableFunction(CandidateSet,
2027 ClassDecl->getLocation(), Best) == OR_Success)
2028 return cast<CXXMethodDecl>(Best->Function);
2029 assert(false &&
2030 "getAssignOperatorMethod - copy assignment operator method not found");
2031 return 0;
2032}
2033
Fariborz Jahanian485f0872009-06-22 23:34:40 +00002034void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation,
2035 CXXConstructorDecl *CopyConstructor,
2036 unsigned TypeQuals) {
2037 assert((CopyConstructor->isImplicit() &&
2038 CopyConstructor->isCopyConstructor(Context, TypeQuals) &&
2039 !CopyConstructor->isUsed()) &&
2040 "DefineImplicitCopyConstructor - call it for implicit copy ctor");
2041
2042 CXXRecordDecl *ClassDecl
2043 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext());
2044 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor");
Fariborz Jahanian220a0f32009-06-23 23:42:10 +00002045 // C++ [class.copy] p209
Fariborz Jahanian485f0872009-06-22 23:34:40 +00002046 // Before the implicitly-declared copy constructor for a class is
2047 // implicitly defined, all the implicitly-declared copy constructors
2048 // for its base class and its non-static data members shall have been
2049 // implicitly defined.
2050 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin();
2051 Base != ClassDecl->bases_end(); ++Base) {
2052 CXXRecordDecl *BaseClassDecl
2053 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl());
2054 if (CXXConstructorDecl *BaseCopyCtor =
2055 BaseClassDecl->getCopyConstructor(Context, TypeQuals))
Fariborz Jahanian220a0f32009-06-23 23:42:10 +00002056 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor);
Fariborz Jahanian485f0872009-06-22 23:34:40 +00002057 }
2058 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context);
2059 Field != ClassDecl->field_end(Context);
2060 ++Field) {
2061 QualType FieldType = Context.getCanonicalType((*Field)->getType());
2062 if (const ArrayType *Array = Context.getAsArrayType(FieldType))
2063 FieldType = Array->getElementType();
2064 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) {
2065 CXXRecordDecl *FieldClassDecl
2066 = cast<CXXRecordDecl>(FieldClassType->getDecl());
2067 if (CXXConstructorDecl *FieldCopyCtor =
2068 FieldClassDecl->getCopyConstructor(Context, TypeQuals))
Fariborz Jahanian220a0f32009-06-23 23:42:10 +00002069 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor);
Fariborz Jahanian485f0872009-06-22 23:34:40 +00002070 }
2071 }
2072 CopyConstructor->setUsed();
2073}
2074
Anders Carlsson930e8d02009-04-16 23:50:50 +00002075void Sema::InitializeVarWithConstructor(VarDecl *VD,
2076 CXXConstructorDecl *Constructor,
2077 QualType DeclInitType,
2078 Expr **Exprs, unsigned NumExprs) {
Anders Carlsson8e587a12009-05-30 20:56:46 +00002079 Expr *Temp = CXXConstructExpr::Create(Context, DeclInitType, Constructor,
Anders Carlsson49d44012009-04-24 05:16:06 +00002080 false, Exprs, NumExprs);
Douglas Gregord7f37bf2009-06-22 23:06:13 +00002081 MarkDeclarationReferenced(VD->getLocation(), Constructor);
Douglas Gregor78d15832009-05-26 18:54:04 +00002082 VD->setInit(Context, Temp);
Anders Carlsson930e8d02009-04-16 23:50:50 +00002083}
2084
Argyrios Kyrtzidis73a0d882008-10-06 17:10:33 +00002085/// AddCXXDirectInitializerToDecl - This action is called immediately after
2086/// ActOnDeclarator, when a C++ direct initializer is present.
2087/// e.g: "int x(1);"
Chris Lattnerb28317a2009-03-28 19:18:32 +00002088void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl,
2089 SourceLocation LParenLoc,
Sebastian Redlf53597f2009-03-15 17:47:39 +00002090 MultiExprArg Exprs,
Argyrios Kyrtzidis73a0d882008-10-06 17:10:33 +00002091 SourceLocation *CommaLocs,
2092 SourceLocation RParenLoc) {
Sebastian Redlf53597f2009-03-15 17:47:39 +00002093 unsigned NumExprs = Exprs.size();
2094 assert(NumExprs != 0 && Exprs.get() && "missing expressions");
Chris Lattnerb28317a2009-03-28 19:18:32 +00002095 Decl *RealDecl = Dcl.getAs<Decl>();
Argyrios Kyrtzidis73a0d882008-10-06 17:10:33 +00002096
2097 // If there is no declaration, there was an error parsing it. Just ignore
2098 // the initializer.
Chris Lattnerb28317a2009-03-28 19:18:32 +00002099 if (RealDecl == 0)
Argyrios Kyrtzidis73a0d882008-10-06 17:10:33 +00002100 return;
Argyrios Kyrtzidis73a0d882008-10-06 17:10:33 +00002101
2102 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl);
2103 if (!VDecl) {
2104 Diag(RealDecl->getLocation(), diag::err_illegal_initializer);
2105 RealDecl->setInvalidDecl();
2106 return;
2107 }
2108
Douglas Gregor615c5d42009-03-24 16:43:20 +00002109 // FIXME: Need to handle dependent types and expressions here.
2110
Argyrios Kyrtzidisce8e2922008-10-06 23:08:37 +00002111 // We will treat direct-initialization as a copy-initialization:
2112 // int x(1); -as-> int x = 1;
Argyrios Kyrtzidis73a0d882008-10-06 17:10:33 +00002113 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c);
2114 //
2115 // Clients that want to distinguish between the two forms, can check for
2116 // direct initializer using VarDecl::hasCXXDirectInitializer().
2117 // A major benefit is that clients that don't particularly care about which
2118 // exactly form was it (like the CodeGen) can handle both cases without
2119 // special case code.
Argyrios Kyrtzidis06ad1f52008-10-06 18:37:09 +00002120
Argyrios Kyrtzidis73a0d882008-10-06 17:10:33 +00002121 // C++ 8.5p11:
2122 // The form of initialization (using parentheses or '=') is generally
2123 // insignificant, but does matter when the entity being initialized has a
Argyrios Kyrtzidis06ad1f52008-10-06 18:37:09 +00002124 // class type.
Douglas Gregor18fe5682008-11-03 20:45:27 +00002125 QualType DeclInitType = VDecl->getType();
2126 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType))
2127 DeclInitType = Array->getElementType();
Argyrios Kyrtzidis06ad1f52008-10-06 18:37:09 +00002128
Douglas Gregor615c5d42009-03-24 16:43:20 +00002129 // FIXME: This isn't the right place to complete the type.
2130 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(),
2131 diag::err_typecheck_decl_incomplete_type)) {
2132 VDecl->setInvalidDecl();
2133 return;
2134 }
2135
Argyrios Kyrtzidis06ad1f52008-10-06 18:37:09 +00002136 if (VDecl->getType()->isRecordType()) {
Douglas Gregor18fe5682008-11-03 20:45:27 +00002137 CXXConstructorDecl *Constructor
Sebastian Redlf53597f2009-03-15 17:47:39 +00002138 = PerformInitializationByConstructor(DeclInitType,
2139 (Expr **)Exprs.get(), NumExprs,
Douglas Gregorf03d7c72008-11-05 15:29:30 +00002140 VDecl->getLocation(),
2141 SourceRange(VDecl->getLocation(),
2142 RParenLoc),
Chris Lattnerd9d22dd2008-11-24 05:29:24 +00002143 VDecl->getDeclName(),
Douglas Gregorf03d7c72008-11-05 15:29:30 +00002144 IK_Direct);
Sebastian Redlf53597f2009-03-15 17:47:39 +00002145 if (!Constructor)
Douglas Gregor18fe5682008-11-03 20:45:27 +00002146 RealDecl->setInvalidDecl();
Anders Carlssonca29ad92009-04-15 21:48:18 +00002147 else {
Anders Carlssonca29ad92009-04-15 21:48:18 +00002148 VDecl->setCXXDirectInitializer(true);
Anders Carlsson930e8d02009-04-16 23:50:50 +00002149 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType,
2150 (Expr**)Exprs.release(), NumExprs);
Anders Carlssonca29ad92009-04-15 21:48:18 +00002151 }
Argyrios Kyrtzidis06ad1f52008-10-06 18:37:09 +00002152 return;
2153 }
Argyrios Kyrtzidis73a0d882008-10-06 17:10:33 +00002154
Argyrios Kyrtzidisce8e2922008-10-06 23:08:37 +00002155 if (NumExprs > 1) {
Chris Lattnerdcd5ef12008-11-19 05:27:50 +00002156 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg)
2157 << SourceRange(VDecl->getLocation(), RParenLoc);
Argyrios Kyrtzidis73a0d882008-10-06 17:10:33 +00002158 RealDecl->setInvalidDecl();
2159 return;
2160 }
2161
Argyrios Kyrtzidis73a0d882008-10-06 17:10:33 +00002162 // Let clients know that initialization was done with a direct initializer.
2163 VDecl->setCXXDirectInitializer(true);
Argyrios Kyrtzidisce8e2922008-10-06 23:08:37 +00002164
2165 assert(NumExprs == 1 && "Expected 1 expression");
2166 // Set the init expression, handles conversions.
Sebastian Redlf53597f2009-03-15 17:47:39 +00002167 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]),
2168 /*DirectInit=*/true);
Argyrios Kyrtzidis73a0d882008-10-06 17:10:33 +00002169}
Douglas Gregor27c8dc02008-10-29 00:13:59 +00002170
Douglas Gregorf03d7c72008-11-05 15:29:30 +00002171/// PerformInitializationByConstructor - Perform initialization by
2172/// constructor (C++ [dcl.init]p14), which may occur as part of
2173/// direct-initialization or copy-initialization. We are initializing
2174/// an object of type @p ClassType with the given arguments @p
2175/// Args. @p Loc is the location in the source code where the
2176/// initializer occurs (e.g., a declaration, member initializer,
2177/// functional cast, etc.) while @p Range covers the whole
2178/// initialization. @p InitEntity is the entity being initialized,
2179/// which may by the name of a declaration or a type. @p Kind is the
2180/// kind of initialization we're performing, which affects whether
2181/// explicit constructors will be considered. When successful, returns
Douglas Gregor18fe5682008-11-03 20:45:27 +00002182/// the constructor that will be used to perform the initialization;
Douglas Gregorf03d7c72008-11-05 15:29:30 +00002183/// when the initialization fails, emits a diagnostic and returns
2184/// null.
Douglas Gregor18fe5682008-11-03 20:45:27 +00002185CXXConstructorDecl *
Douglas Gregorf03d7c72008-11-05 15:29:30 +00002186Sema::PerformInitializationByConstructor(QualType ClassType,
2187 Expr **Args, unsigned NumArgs,
2188 SourceLocation Loc, SourceRange Range,
Chris Lattnerd9d22dd2008-11-24 05:29:24 +00002189 DeclarationName InitEntity,
Douglas Gregorf03d7c72008-11-05 15:29:30 +00002190 InitializationKind Kind) {
Douglas Gregor18fe5682008-11-03 20:45:27 +00002191 const RecordType *ClassRec = ClassType->getAsRecordType();
2192 assert(ClassRec && "Can only initialize a class type here");
2193
2194 // C++ [dcl.init]p14:
2195 //
2196 // If the initialization is direct-initialization, or if it is
2197 // copy-initialization where the cv-unqualified version of the
2198 // source type is the same class as, or a derived class of, the
2199 // class of the destination, constructors are considered. The
2200 // applicable constructors are enumerated (13.3.1.3), and the
2201 // best one is chosen through overload resolution (13.3). The
2202 // constructor so selected is called to initialize the object,
2203 // with the initializer expression(s) as its argument(s). If no
2204 // constructor applies, or the overload resolution is ambiguous,
2205 // the initialization is ill-formed.
Douglas Gregor18fe5682008-11-03 20:45:27 +00002206 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl());
2207 OverloadCandidateSet CandidateSet;
Douglas Gregorf03d7c72008-11-05 15:29:30 +00002208
2209 // Add constructors to the overload set.
Douglas Gregor9e7d9de2008-12-15 21:24:18 +00002210 DeclarationName ConstructorName
2211 = Context.DeclarationNames.getCXXConstructorName(
2212 Context.getCanonicalType(ClassType.getUnqualifiedType()));
Douglas Gregor3fc749d2008-12-23 00:26:44 +00002213 DeclContext::lookup_const_iterator Con, ConEnd;
Douglas Gregor6ab35242009-04-09 21:40:53 +00002214 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(Context, ConstructorName);
Douglas Gregor3fc749d2008-12-23 00:26:44 +00002215 Con != ConEnd; ++Con) {
2216 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con);
Douglas Gregorf03d7c72008-11-05 15:29:30 +00002217 if ((Kind == IK_Direct) ||
2218 (Kind == IK_Copy && Constructor->isConvertingConstructor()) ||
2219 (Kind == IK_Default && Constructor->isDefaultConstructor()))
2220 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet);
2221 }
2222
Douglas Gregor9e7d9de2008-12-15 21:24:18 +00002223 // FIXME: When we decide not to synthesize the implicitly-declared
2224 // constructors, we'll need to make them appear here.
2225
Douglas Gregor18fe5682008-11-03 20:45:27 +00002226 OverloadCandidateSet::iterator Best;
Douglas Gregore0762c92009-06-19 23:52:42 +00002227 switch (BestViableFunction(CandidateSet, Loc, Best)) {
Douglas Gregor18fe5682008-11-03 20:45:27 +00002228 case OR_Success:
2229 // We found a constructor. Return it.
2230 return cast<CXXConstructorDecl>(Best->Function);
2231
2232 case OR_No_Viable_Function:
Douglas Gregor87fd7032009-02-02 17:43:21 +00002233 if (InitEntity)
2234 Diag(Loc, diag::err_ovl_no_viable_function_in_init)
Chris Lattner4330d652009-02-17 07:29:20 +00002235 << InitEntity << Range;
Douglas Gregor87fd7032009-02-02 17:43:21 +00002236 else
2237 Diag(Loc, diag::err_ovl_no_viable_function_in_init)
Chris Lattner4330d652009-02-17 07:29:20 +00002238 << ClassType << Range;
Sebastian Redle4c452c2008-11-22 13:44:36 +00002239 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false);
Douglas Gregor18fe5682008-11-03 20:45:27 +00002240 return 0;
2241
2242 case OR_Ambiguous:
Douglas Gregor87fd7032009-02-02 17:43:21 +00002243 if (InitEntity)
2244 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range;
2245 else
2246 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range;
Douglas Gregor18fe5682008-11-03 20:45:27 +00002247 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true);
2248 return 0;
Douglas Gregor48f3bb92009-02-18 21:56:37 +00002249
2250 case OR_Deleted:
2251 if (InitEntity)
2252 Diag(Loc, diag::err_ovl_deleted_init)
2253 << Best->Function->isDeleted()
2254 << InitEntity << Range;
2255 else
2256 Diag(Loc, diag::err_ovl_deleted_init)
2257 << Best->Function->isDeleted()
2258 << InitEntity << Range;
2259 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true);
2260 return 0;
Douglas Gregor18fe5682008-11-03 20:45:27 +00002261 }
2262
2263 return 0;
2264}
2265
Douglas Gregor27c8dc02008-10-29 00:13:59 +00002266/// CompareReferenceRelationship - Compare the two types T1 and T2 to
2267/// determine whether they are reference-related,
2268/// reference-compatible, reference-compatible with added
2269/// qualification, or incompatible, for use in C++ initialization by
2270/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference
2271/// type, and the first type (T1) is the pointee type of the reference
2272/// type being initialized.
2273Sema::ReferenceCompareResult
Douglas Gregor15da57e2008-10-29 02:00:59 +00002274Sema::CompareReferenceRelationship(QualType T1, QualType T2,
2275 bool& DerivedToBase) {
Sebastian Redl7c80bd62009-03-16 23:22:08 +00002276 assert(!T1->isReferenceType() &&
2277 "T1 must be the pointee type of the reference type");
Douglas Gregor27c8dc02008-10-29 00:13:59 +00002278 assert(!T2->isReferenceType() && "T2 cannot be a reference type");
2279
2280 T1 = Context.getCanonicalType(T1);
2281 T2 = Context.getCanonicalType(T2);
2282 QualType UnqualT1 = T1.getUnqualifiedType();
2283 QualType UnqualT2 = T2.getUnqualifiedType();
2284
2285 // C++ [dcl.init.ref]p4:
2286 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is
2287 // reference-related to “cv2 T2” if T1 is the same type as T2, or
2288 // T1 is a base class of T2.
Douglas Gregor15da57e2008-10-29 02:00:59 +00002289 if (UnqualT1 == UnqualT2)
2290 DerivedToBase = false;
2291 else if (IsDerivedFrom(UnqualT2, UnqualT1))
2292 DerivedToBase = true;
2293 else
Douglas Gregor27c8dc02008-10-29 00:13:59 +00002294 return Ref_Incompatible;
2295
2296 // At this point, we know that T1 and T2 are reference-related (at
2297 // least).
2298
2299 // C++ [dcl.init.ref]p4:
2300 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is
2301 // reference-related to T2 and cv1 is the same cv-qualification
2302 // as, or greater cv-qualification than, cv2. For purposes of
2303 // overload resolution, cases for which cv1 is greater
2304 // cv-qualification than cv2 are identified as
2305 // reference-compatible with added qualification (see 13.3.3.2).
2306 if (T1.getCVRQualifiers() == T2.getCVRQualifiers())
2307 return Ref_Compatible;
2308 else if (T1.isMoreQualifiedThan(T2))
2309 return Ref_Compatible_With_Added_Qualification;
2310 else
2311 return Ref_Related;
2312}
2313
2314/// CheckReferenceInit - Check the initialization of a reference
2315/// variable with the given initializer (C++ [dcl.init.ref]). Init is
2316/// the initializer (either a simple initializer or an initializer
Douglas Gregor3205a782008-10-29 23:31:03 +00002317/// list), and DeclType is the type of the declaration. When ICS is
2318/// non-null, this routine will compute the implicit conversion
2319/// sequence according to C++ [over.ics.ref] and will not produce any
2320/// diagnostics; when ICS is null, it will emit diagnostics when any
2321/// errors are found. Either way, a return value of true indicates
2322/// that there was a failure, a return value of false indicates that
2323/// the reference initialization succeeded.
Douglas Gregor225c41e2008-11-03 19:09:14 +00002324///
2325/// When @p SuppressUserConversions, user-defined conversions are
2326/// suppressed.
Douglas Gregor09f41cf2009-01-14 15:45:31 +00002327/// When @p AllowExplicit, we also permit explicit user-defined
2328/// conversion functions.
Sebastian Redle2b68332009-04-12 17:16:29 +00002329/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue.
Douglas Gregor15da57e2008-10-29 02:00:59 +00002330bool
Sebastian Redl3201f6b2009-04-16 17:51:27 +00002331Sema::CheckReferenceInit(Expr *&Init, QualType DeclType,
Douglas Gregor225c41e2008-11-03 19:09:14 +00002332 ImplicitConversionSequence *ICS,
Douglas Gregor09f41cf2009-01-14 15:45:31 +00002333 bool SuppressUserConversions,
Sebastian Redle2b68332009-04-12 17:16:29 +00002334 bool AllowExplicit, bool ForceRValue) {
Douglas Gregor27c8dc02008-10-29 00:13:59 +00002335 assert(DeclType->isReferenceType() && "Reference init needs a reference");
2336
2337 QualType T1 = DeclType->getAsReferenceType()->getPointeeType();
2338 QualType T2 = Init->getType();
2339
Douglas Gregor904eed32008-11-10 20:40:00 +00002340 // If the initializer is the address of an overloaded function, try
2341 // to resolve the overloaded function. If all goes well, T2 is the
2342 // type of the resulting function.
Douglas Gregor063daf62009-03-13 18:40:31 +00002343 if (Context.getCanonicalType(T2) == Context.OverloadTy) {
Douglas Gregor904eed32008-11-10 20:40:00 +00002344 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType,
2345 ICS != 0);
2346 if (Fn) {
2347 // Since we're performing this reference-initialization for
2348 // real, update the initializer with the resulting function.
Douglas Gregor48f3bb92009-02-18 21:56:37 +00002349 if (!ICS) {
2350 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin()))
2351 return true;
2352
Douglas Gregor904eed32008-11-10 20:40:00 +00002353 FixOverloadedFunctionReference(Init, Fn);
Douglas Gregor48f3bb92009-02-18 21:56:37 +00002354 }
Douglas Gregor904eed32008-11-10 20:40:00 +00002355
2356 T2 = Fn->getType();
2357 }
2358 }
2359
Douglas Gregor15da57e2008-10-29 02:00:59 +00002360 // Compute some basic properties of the types and the initializer.
Sebastian Redl7c80bd62009-03-16 23:22:08 +00002361 bool isRValRef = DeclType->isRValueReferenceType();
Douglas Gregor15da57e2008-10-29 02:00:59 +00002362 bool DerivedToBase = false;
Sebastian Redle2b68332009-04-12 17:16:29 +00002363 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression :
2364 Init->isLvalue(Context);
Douglas Gregor15da57e2008-10-29 02:00:59 +00002365 ReferenceCompareResult RefRelationship
2366 = CompareReferenceRelationship(T1, T2, DerivedToBase);
2367
2368 // Most paths end in a failed conversion.
2369 if (ICS)
2370 ICS->ConversionKind = ImplicitConversionSequence::BadConversion;
Douglas Gregor27c8dc02008-10-29 00:13:59 +00002371
2372 // C++ [dcl.init.ref]p5:
2373 // A reference to type “cv1 T1” is initialized by an expression
2374 // of type “cv2 T2” as follows:
2375
2376 // -- If the initializer expression
2377
Sebastian Redla9845802009-03-29 15:27:50 +00002378 // Rvalue references cannot bind to lvalues (N2812).
2379 // There is absolutely no situation where they can. In particular, note that
2380 // this is ill-formed, even if B has a user-defined conversion to A&&:
2381 // B b;
2382 // A&& r = b;
2383 if (isRValRef && InitLvalue == Expr::LV_Valid) {
2384 if (!ICS)
2385 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref)
2386 << Init->getSourceRange();
2387 return true;
2388 }
2389
Douglas Gregor27c8dc02008-10-29 00:13:59 +00002390 bool BindsDirectly = false;
2391 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is
2392 // reference-compatible with “cv2 T2,” or
Douglas Gregor15da57e2008-10-29 02:00:59 +00002393 //
2394 // Note that the bit-field check is skipped if we are just computing
2395 // the implicit conversion sequence (C++ [over.best.ics]p2).
Douglas Gregor33bbbc52009-05-02 02:18:30 +00002396 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) &&
Douglas Gregor15da57e2008-10-29 02:00:59 +00002397 RefRelationship >= Ref_Compatible_With_Added_Qualification) {
Douglas Gregor27c8dc02008-10-29 00:13:59 +00002398 BindsDirectly = true;
2399
Douglas Gregor15da57e2008-10-29 02:00:59 +00002400 if (ICS) {
2401 // C++ [over.ics.ref]p1:
2402 // When a parameter of reference type binds directly (8.5.3)
2403 // to an argument expression, the implicit conversion sequence
2404 // is the identity conversion, unless the argument expression
2405 // has a type that is a derived class of the parameter type,
2406 // in which case the implicit conversion sequence is a
2407 // derived-to-base Conversion (13.3.3.1).
2408 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion;
2409 ICS->Standard.First = ICK_Identity;
2410 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity;
2411 ICS->Standard.Third = ICK_Identity;
2412 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr();
2413 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr();
Douglas Gregorf70bdb92008-10-29 14:50:44 +00002414 ICS->Standard.ReferenceBinding = true;
2415 ICS->Standard.DirectBinding = true;
Sebastian Redla9845802009-03-29 15:27:50 +00002416 ICS->Standard.RRefBinding = false;
Sebastian Redl76458502009-04-17 16:30:52 +00002417 ICS->Standard.CopyConstructor = 0;
Douglas Gregor15da57e2008-10-29 02:00:59 +00002418
2419 // Nothing more to do: the inaccessibility/ambiguity check for
2420 // derived-to-base conversions is suppressed when we're
2421 // computing the implicit conversion sequence (C++
2422 // [over.best.ics]p2).
2423 return false;
2424 } else {
2425 // Perform the conversion.
Mike Stump390b4cc2009-05-16 07:39:55 +00002426 // FIXME: Binding to a subobject of the lvalue is going to require more
2427 // AST annotation than this.
Douglas Gregoreb8f3062008-11-12 17:17:38 +00002428 ImpCastExprToType(Init, T1, /*isLvalue=*/true);
Douglas Gregor27c8dc02008-10-29 00:13:59 +00002429 }
2430 }
2431
2432 // -- has a class type (i.e., T2 is a class type) and can be
2433 // implicitly converted to an lvalue of type “cv3 T3,”
2434 // where “cv1 T1” is reference-compatible with “cv3 T3”
2435 // 92) (this conversion is selected by enumerating the
2436 // applicable conversion functions (13.3.1.6) and choosing
2437 // the best one through overload resolution (13.3)),
Sebastian Redl7c80bd62009-03-16 23:22:08 +00002438 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) {
Douglas Gregorcb9b9772008-11-10 16:14:15 +00002439 // FIXME: Look for conversions in base classes!
2440 CXXRecordDecl *T2RecordDecl
2441 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl());
Douglas Gregor27c8dc02008-10-29 00:13:59 +00002442
Douglas Gregorcb9b9772008-11-10 16:14:15 +00002443 OverloadCandidateSet CandidateSet;
2444 OverloadedFunctionDecl *Conversions
2445 = T2RecordDecl->getConversionFunctions();
2446 for (OverloadedFunctionDecl::function_iterator Func
2447 = Conversions->function_begin();
2448 Func != Conversions->function_end(); ++Func) {
2449 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func);
Sebastian Redldfe292d2009-03-22 21:28:55 +00002450
Douglas Gregorcb9b9772008-11-10 16:14:15 +00002451 // If the conversion function doesn't return a reference type,
2452 // it can't be considered for this conversion.
Sebastian Redl7c80bd62009-03-16 23:22:08 +00002453 if (Conv->getConversionType()->isLValueReferenceType() &&
Douglas Gregor09f41cf2009-01-14 15:45:31 +00002454 (AllowExplicit || !Conv->isExplicit()))
Douglas Gregorcb9b9772008-11-10 16:14:15 +00002455 AddConversionCandidate(Conv, Init, DeclType, CandidateSet);
2456 }
2457
2458 OverloadCandidateSet::iterator Best;
Douglas Gregore0762c92009-06-19 23:52:42 +00002459 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) {
Douglas Gregorcb9b9772008-11-10 16:14:15 +00002460 case OR_Success:
2461 // This is a direct binding.
2462 BindsDirectly = true;
2463
2464 if (ICS) {
2465 // C++ [over.ics.ref]p1:
2466 //
2467 // [...] If the parameter binds directly to the result of
2468 // applying a conversion function to the argument
2469 // expression, the implicit conversion sequence is a
2470 // user-defined conversion sequence (13.3.3.1.2), with the
2471 // second standard conversion sequence either an identity
2472 // conversion or, if the conversion function returns an
2473 // entity of a type that is a derived class of the parameter
2474 // type, a derived-to-base Conversion.
2475 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion;
2476 ICS->UserDefined.Before = Best->Conversions[0].Standard;
2477 ICS->UserDefined.After = Best->FinalConversion;
2478 ICS->UserDefined.ConversionFunction = Best->Function;
2479 assert(ICS->UserDefined.After.ReferenceBinding &&
2480 ICS->UserDefined.After.DirectBinding &&
2481 "Expected a direct reference binding!");
2482 return false;
2483 } else {
2484 // Perform the conversion.
Mike Stump390b4cc2009-05-16 07:39:55 +00002485 // FIXME: Binding to a subobject of the lvalue is going to require more
2486 // AST annotation than this.
Douglas Gregoreb8f3062008-11-12 17:17:38 +00002487 ImpCastExprToType(Init, T1, /*isLvalue=*/true);
Douglas Gregorcb9b9772008-11-10 16:14:15 +00002488 }
2489 break;
2490
2491 case OR_Ambiguous:
2492 assert(false && "Ambiguous reference binding conversions not implemented.");
2493 return true;
2494
2495 case OR_No_Viable_Function:
Douglas Gregor48f3bb92009-02-18 21:56:37 +00002496 case OR_Deleted:
2497 // There was no suitable conversion, or we found a deleted
2498 // conversion; continue with other checks.
Douglas Gregorcb9b9772008-11-10 16:14:15 +00002499 break;
2500 }
2501 }
2502
Douglas Gregor27c8dc02008-10-29 00:13:59 +00002503 if (BindsDirectly) {
2504 // C++ [dcl.init.ref]p4:
2505 // [...] In all cases where the reference-related or
2506 // reference-compatible relationship of two types is used to
2507 // establish the validity of a reference binding, and T1 is a
2508 // base class of T2, a program that necessitates such a binding
2509 // is ill-formed if T1 is an inaccessible (clause 11) or
2510 // ambiguous (10.2) base class of T2.
2511 //
2512 // Note that we only check this condition when we're allowed to
2513 // complain about errors, because we should not be checking for
2514 // ambiguity (or inaccessibility) unless the reference binding
2515 // actually happens.
Douglas Gregor15da57e2008-10-29 02:00:59 +00002516 if (DerivedToBase)
2517 return CheckDerivedToBaseConversion(T2, T1,
2518 Init->getSourceRange().getBegin(),
2519 Init->getSourceRange());
2520 else
2521 return false;
Douglas Gregor27c8dc02008-10-29 00:13:59 +00002522 }
2523
2524 // -- Otherwise, the reference shall be to a non-volatile const
Sebastian Redla9845802009-03-29 15:27:50 +00002525 // type (i.e., cv1 shall be const), or the reference shall be an
2526 // rvalue reference and the initializer expression shall be an rvalue.
Sebastian Redl7c80bd62009-03-16 23:22:08 +00002527 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) {
Douglas Gregor15da57e2008-10-29 02:00:59 +00002528 if (!ICS)
Douglas Gregor27c8dc02008-10-29 00:13:59 +00002529 Diag(Init->getSourceRange().getBegin(),
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00002530 diag::err_not_reference_to_const_init)
Chris Lattnerd1625842008-11-24 06:25:27 +00002531 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value")
2532 << T2 << Init->getSourceRange();
Douglas Gregor27c8dc02008-10-29 00:13:59 +00002533 return true;
2534 }
2535
2536 // -- If the initializer expression is an rvalue, with T2 a
2537 // class type, and “cv1 T1” is reference-compatible with
2538 // “cv2 T2,” the reference is bound in one of the
2539 // following ways (the choice is implementation-defined):
2540 //
2541 // -- The reference is bound to the object represented by
2542 // the rvalue (see 3.10) or to a sub-object within that
2543 // object.
2544 //
2545 // -- A temporary of type “cv1 T2” [sic] is created, and
2546 // a constructor is called to copy the entire rvalue
2547 // object into the temporary. The reference is bound to
2548 // the temporary or to a sub-object within the
2549 // temporary.
2550 //
Douglas Gregor27c8dc02008-10-29 00:13:59 +00002551 // The constructor that would be used to make the copy
2552 // shall be callable whether or not the copy is actually
2553 // done.
2554 //
Sebastian Redla9845802009-03-29 15:27:50 +00002555 // Note that C++0x [dcl.init.ref]p5 takes away this implementation
Douglas Gregor27c8dc02008-10-29 00:13:59 +00002556 // freedom, so we will always take the first option and never build
2557 // a temporary in this case. FIXME: We will, however, have to check
2558 // for the presence of a copy constructor in C++98/03 mode.
2559 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() &&
Douglas Gregor15da57e2008-10-29 02:00:59 +00002560 RefRelationship >= Ref_Compatible_With_Added_Qualification) {
2561 if (ICS) {
2562 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion;
2563 ICS->Standard.First = ICK_Identity;
2564 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity;
2565 ICS->Standard.Third = ICK_Identity;
2566 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr();
2567 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr();
Douglas Gregorf70bdb92008-10-29 14:50:44 +00002568 ICS->Standard.ReferenceBinding = true;
Sebastian Redla9845802009-03-29 15:27:50 +00002569 ICS->Standard.DirectBinding = false;
2570 ICS->Standard.RRefBinding = isRValRef;
Sebastian Redl76458502009-04-17 16:30:52 +00002571 ICS->Standard.CopyConstructor = 0;
Douglas Gregor15da57e2008-10-29 02:00:59 +00002572 } else {
Mike Stump390b4cc2009-05-16 07:39:55 +00002573 // FIXME: Binding to a subobject of the rvalue is going to require more
2574 // AST annotation than this.
Anders Carlsson68654802009-05-19 00:38:24 +00002575 ImpCastExprToType(Init, T1, /*isLvalue=*/false);
Douglas Gregor27c8dc02008-10-29 00:13:59 +00002576 }
2577 return false;
2578 }
2579
2580 // -- Otherwise, a temporary of type “cv1 T1” is created and
2581 // initialized from the initializer expression using the
2582 // rules for a non-reference copy initialization (8.5). The
2583 // reference is then bound to the temporary. If T1 is
2584 // reference-related to T2, cv1 must be the same
2585 // cv-qualification as, or greater cv-qualification than,
2586 // cv2; otherwise, the program is ill-formed.
2587 if (RefRelationship == Ref_Related) {
2588 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then
2589 // we would be reference-compatible or reference-compatible with
2590 // added qualification. But that wasn't the case, so the reference
2591 // initialization fails.
Douglas Gregor15da57e2008-10-29 02:00:59 +00002592 if (!ICS)
Douglas Gregor27c8dc02008-10-29 00:13:59 +00002593 Diag(Init->getSourceRange().getBegin(),
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00002594 diag::err_reference_init_drops_quals)
Chris Lattnerd1625842008-11-24 06:25:27 +00002595 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value")
2596 << T2 << Init->getSourceRange();
Douglas Gregor27c8dc02008-10-29 00:13:59 +00002597 return true;
2598 }
2599
Douglas Gregor734d9862009-01-30 23:27:23 +00002600 // If at least one of the types is a class type, the types are not
2601 // related, and we aren't allowed any user conversions, the
2602 // reference binding fails. This case is important for breaking
2603 // recursion, since TryImplicitConversion below will attempt to
2604 // create a temporary through the use of a copy constructor.
2605 if (SuppressUserConversions && RefRelationship == Ref_Incompatible &&
2606 (T1->isRecordType() || T2->isRecordType())) {
2607 if (!ICS)
2608 Diag(Init->getSourceRange().getBegin(),
2609 diag::err_typecheck_convert_incompatible)
2610 << DeclType << Init->getType() << "initializing" << Init->getSourceRange();
2611 return true;
2612 }
2613
Douglas Gregor27c8dc02008-10-29 00:13:59 +00002614 // Actually try to convert the initializer to T1.
Douglas Gregor15da57e2008-10-29 02:00:59 +00002615 if (ICS) {
Sebastian Redla9845802009-03-29 15:27:50 +00002616 // C++ [over.ics.ref]p2:
2617 //
2618 // When a parameter of reference type is not bound directly to
2619 // an argument expression, the conversion sequence is the one
2620 // required to convert the argument expression to the
2621 // underlying type of the reference according to
2622 // 13.3.3.1. Conceptually, this conversion sequence corresponds
2623 // to copy-initializing a temporary of the underlying type with
2624 // the argument expression. Any difference in top-level
2625 // cv-qualification is subsumed by the initialization itself
2626 // and does not constitute a conversion.
Douglas Gregor225c41e2008-11-03 19:09:14 +00002627 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions);
Sebastian Redla9845802009-03-29 15:27:50 +00002628 // Of course, that's still a reference binding.
2629 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) {
2630 ICS->Standard.ReferenceBinding = true;
2631 ICS->Standard.RRefBinding = isRValRef;
2632 } else if(ICS->ConversionKind ==
2633 ImplicitConversionSequence::UserDefinedConversion) {
2634 ICS->UserDefined.After.ReferenceBinding = true;
2635 ICS->UserDefined.After.RRefBinding = isRValRef;
2636 }
Douglas Gregor15da57e2008-10-29 02:00:59 +00002637 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion;
2638 } else {
Douglas Gregor45920e82008-12-19 17:40:08 +00002639 return PerformImplicitConversion(Init, T1, "initializing");
Douglas Gregor15da57e2008-10-29 02:00:59 +00002640 }
Douglas Gregor27c8dc02008-10-29 00:13:59 +00002641}
Douglas Gregor1cd1b1e2008-11-06 22:13:31 +00002642
2643/// CheckOverloadedOperatorDeclaration - Check whether the declaration
2644/// of this overloaded operator is well-formed. If so, returns false;
2645/// otherwise, emits appropriate diagnostics and returns true.
2646bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) {
Douglas Gregor43c7bad2008-11-17 16:14:12 +00002647 assert(FnDecl && FnDecl->isOverloadedOperator() &&
Douglas Gregor1cd1b1e2008-11-06 22:13:31 +00002648 "Expected an overloaded operator declaration");
2649
Douglas Gregor1cd1b1e2008-11-06 22:13:31 +00002650 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator();
2651
2652 // C++ [over.oper]p5:
2653 // The allocation and deallocation functions, operator new,
2654 // operator new[], operator delete and operator delete[], are
2655 // described completely in 3.7.3. The attributes and restrictions
2656 // found in the rest of this subclause do not apply to them unless
2657 // explicitly stated in 3.7.3.
Mike Stump390b4cc2009-05-16 07:39:55 +00002658 // FIXME: Write a separate routine for checking this. For now, just allow it.
Douglas Gregor1cd1b1e2008-11-06 22:13:31 +00002659 if (Op == OO_New || Op == OO_Array_New ||
2660 Op == OO_Delete || Op == OO_Array_Delete)
2661 return false;
2662
2663 // C++ [over.oper]p6:
2664 // An operator function shall either be a non-static member
2665 // function or be a non-member function and have at least one
2666 // parameter whose type is a class, a reference to a class, an
2667 // enumeration, or a reference to an enumeration.
Douglas Gregor43c7bad2008-11-17 16:14:12 +00002668 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) {
2669 if (MethodDecl->isStatic())
2670 return Diag(FnDecl->getLocation(),
Chris Lattnerd9d22dd2008-11-24 05:29:24 +00002671 diag::err_operator_overload_static) << FnDecl->getDeclName();
Douglas Gregor1cd1b1e2008-11-06 22:13:31 +00002672 } else {
2673 bool ClassOrEnumParam = false;
Douglas Gregor43c7bad2008-11-17 16:14:12 +00002674 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(),
2675 ParamEnd = FnDecl->param_end();
2676 Param != ParamEnd; ++Param) {
2677 QualType ParamType = (*Param)->getType().getNonReferenceType();
Douglas Gregor1cd1b1e2008-11-06 22:13:31 +00002678 if (ParamType->isRecordType() || ParamType->isEnumeralType()) {
2679 ClassOrEnumParam = true;
2680 break;
2681 }
2682 }
2683
Douglas Gregor43c7bad2008-11-17 16:14:12 +00002684 if (!ClassOrEnumParam)
2685 return Diag(FnDecl->getLocation(),
Chris Lattnerf3a41af2008-11-20 06:38:18 +00002686 diag::err_operator_overload_needs_class_or_enum)
Chris Lattnerd9d22dd2008-11-24 05:29:24 +00002687 << FnDecl->getDeclName();
Douglas Gregor1cd1b1e2008-11-06 22:13:31 +00002688 }
2689
2690 // C++ [over.oper]p8:
2691 // An operator function cannot have default arguments (8.3.6),
2692 // except where explicitly stated below.
2693 //
2694 // Only the function-call operator allows default arguments
2695 // (C++ [over.call]p1).
2696 if (Op != OO_Call) {
2697 for (FunctionDecl::param_iterator Param = FnDecl->param_begin();
2698 Param != FnDecl->param_end(); ++Param) {
Douglas Gregor61366e92008-12-24 00:01:03 +00002699 if ((*Param)->hasUnparsedDefaultArg())
2700 return Diag((*Param)->getLocation(),
2701 diag::err_operator_overload_default_arg)
2702 << FnDecl->getDeclName();
2703 else if (Expr *DefArg = (*Param)->getDefaultArg())
Douglas Gregor43c7bad2008-11-17 16:14:12 +00002704 return Diag((*Param)->getLocation(),
Chris Lattnerd3a94e22008-11-20 06:06:08 +00002705 diag::err_operator_overload_default_arg)
Chris Lattnerd9d22dd2008-11-24 05:29:24 +00002706 << FnDecl->getDeclName() << DefArg->getSourceRange();
Douglas Gregor1cd1b1e2008-11-06 22:13:31 +00002707 }
2708 }
2709
Douglas Gregor02bcd4c2008-11-10 13:38:07 +00002710 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = {
2711 { false, false, false }
2712#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \
2713 , { Unary, Binary, MemberOnly }
2714#include "clang/Basic/OperatorKinds.def"
2715 };
Douglas Gregor1cd1b1e2008-11-06 22:13:31 +00002716
Douglas Gregor02bcd4c2008-11-10 13:38:07 +00002717 bool CanBeUnaryOperator = OperatorUses[Op][0];
2718 bool CanBeBinaryOperator = OperatorUses[Op][1];
2719 bool MustBeMemberOperator = OperatorUses[Op][2];
Douglas Gregor1cd1b1e2008-11-06 22:13:31 +00002720
2721 // C++ [over.oper]p8:
2722 // [...] Operator functions cannot have more or fewer parameters
2723 // than the number required for the corresponding operator, as
2724 // described in the rest of this subclause.
Douglas Gregor43c7bad2008-11-17 16:14:12 +00002725 unsigned NumParams = FnDecl->getNumParams()
2726 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0);
Douglas Gregor1cd1b1e2008-11-06 22:13:31 +00002727 if (Op != OO_Call &&
2728 ((NumParams == 1 && !CanBeUnaryOperator) ||
2729 (NumParams == 2 && !CanBeBinaryOperator) ||
2730 (NumParams < 1) || (NumParams > 2))) {
2731 // We have the wrong number of parameters.
Chris Lattner416e46f2008-11-21 07:57:12 +00002732 unsigned ErrorKind;
Douglas Gregor02bcd4c2008-11-10 13:38:07 +00002733 if (CanBeUnaryOperator && CanBeBinaryOperator) {
Chris Lattner416e46f2008-11-21 07:57:12 +00002734 ErrorKind = 2; // 2 -> unary or binary.
Douglas Gregor02bcd4c2008-11-10 13:38:07 +00002735 } else if (CanBeUnaryOperator) {
Chris Lattner416e46f2008-11-21 07:57:12 +00002736 ErrorKind = 0; // 0 -> unary
Douglas Gregor02bcd4c2008-11-10 13:38:07 +00002737 } else {
Chris Lattneraf7ae4e2008-11-21 07:50:02 +00002738 assert(CanBeBinaryOperator &&
2739 "All non-call overloaded operators are unary or binary!");
Chris Lattner416e46f2008-11-21 07:57:12 +00002740 ErrorKind = 1; // 1 -> binary
Douglas Gregor02bcd4c2008-11-10 13:38:07 +00002741 }
Douglas Gregor1cd1b1e2008-11-06 22:13:31 +00002742
Chris Lattner416e46f2008-11-21 07:57:12 +00002743 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be)
Chris Lattnerd9d22dd2008-11-24 05:29:24 +00002744 << FnDecl->getDeclName() << NumParams << ErrorKind;
Douglas Gregor1cd1b1e2008-11-06 22:13:31 +00002745 }
Sebastian Redl64b45f72009-01-05 20:52:13 +00002746
Douglas Gregor43c7bad2008-11-17 16:14:12 +00002747 // Overloaded operators other than operator() cannot be variadic.
2748 if (Op != OO_Call &&
Douglas Gregor72564e72009-02-26 23:50:07 +00002749 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) {
Chris Lattnerf3a41af2008-11-20 06:38:18 +00002750 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic)
Chris Lattnerd9d22dd2008-11-24 05:29:24 +00002751 << FnDecl->getDeclName();
Douglas Gregor1cd1b1e2008-11-06 22:13:31 +00002752 }
2753
2754 // Some operators must be non-static member functions.
Douglas Gregor43c7bad2008-11-17 16:14:12 +00002755 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) {
2756 return Diag(FnDecl->getLocation(),
Chris Lattnerf3a41af2008-11-20 06:38:18 +00002757 diag::err_operator_overload_must_be_member)
Chris Lattnerd9d22dd2008-11-24 05:29:24 +00002758 << FnDecl->getDeclName();
Douglas Gregor1cd1b1e2008-11-06 22:13:31 +00002759 }
2760
2761 // C++ [over.inc]p1:
2762 // The user-defined function called operator++ implements the
2763 // prefix and postfix ++ operator. If this function is a member
2764 // function with no parameters, or a non-member function with one
2765 // parameter of class or enumeration type, it defines the prefix
2766 // increment operator ++ for objects of that type. If the function
2767 // is a member function with one parameter (which shall be of type
2768 // int) or a non-member function with two parameters (the second
2769 // of which shall be of type int), it defines the postfix
2770 // increment operator ++ for objects of that type.
2771 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) {
2772 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1);
2773 bool ParamIsInt = false;
2774 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType())
2775 ParamIsInt = BT->getKind() == BuiltinType::Int;
2776
Chris Lattneraf7ae4e2008-11-21 07:50:02 +00002777 if (!ParamIsInt)
2778 return Diag(LastParam->getLocation(),
2779 diag::err_operator_overload_post_incdec_must_be_int)
Chris Lattnerd1625842008-11-24 06:25:27 +00002780 << LastParam->getType() << (Op == OO_MinusMinus);
Douglas Gregor1cd1b1e2008-11-06 22:13:31 +00002781 }
2782
Sebastian Redl64b45f72009-01-05 20:52:13 +00002783 // Notify the class if it got an assignment operator.
2784 if (Op == OO_Equal) {
2785 // Would have returned earlier otherwise.
2786 assert(isa<CXXMethodDecl>(FnDecl) &&
2787 "Overloaded = not member, but not filtered.");
2788 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl);
2789 Method->getParent()->addedAssignmentOperator(Context, Method);
2790 }
2791
Douglas Gregor43c7bad2008-11-17 16:14:12 +00002792 return false;
Douglas Gregor1cd1b1e2008-11-06 22:13:31 +00002793}
Chris Lattner5a003a42008-12-17 07:09:26 +00002794
Douglas Gregor074149e2009-01-05 19:45:36 +00002795/// ActOnStartLinkageSpecification - Parsed the beginning of a C++
2796/// linkage specification, including the language and (if present)
2797/// the '{'. ExternLoc is the location of the 'extern', LangLoc is
2798/// the location of the language string literal, which is provided
2799/// by Lang/StrSize. LBraceLoc, if valid, provides the location of
2800/// the '{' brace. Otherwise, this linkage specification does not
2801/// have any braces.
Chris Lattnerb28317a2009-03-28 19:18:32 +00002802Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S,
2803 SourceLocation ExternLoc,
2804 SourceLocation LangLoc,
2805 const char *Lang,
2806 unsigned StrSize,
2807 SourceLocation LBraceLoc) {
Chris Lattnercc98eac2008-12-17 07:13:27 +00002808 LinkageSpecDecl::LanguageIDs Language;
2809 if (strncmp(Lang, "\"C\"", StrSize) == 0)
2810 Language = LinkageSpecDecl::lang_c;
2811 else if (strncmp(Lang, "\"C++\"", StrSize) == 0)
2812 Language = LinkageSpecDecl::lang_cxx;
2813 else {
Douglas Gregor074149e2009-01-05 19:45:36 +00002814 Diag(LangLoc, diag::err_bad_language);
Chris Lattnerb28317a2009-03-28 19:18:32 +00002815 return DeclPtrTy();
Chris Lattnercc98eac2008-12-17 07:13:27 +00002816 }
2817
2818 // FIXME: Add all the various semantics of linkage specifications
2819
Douglas Gregor074149e2009-01-05 19:45:36 +00002820 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext,
2821 LangLoc, Language,
2822 LBraceLoc.isValid());
Douglas Gregor6ab35242009-04-09 21:40:53 +00002823 CurContext->addDecl(Context, D);
Douglas Gregor074149e2009-01-05 19:45:36 +00002824 PushDeclContext(S, D);
Chris Lattnerb28317a2009-03-28 19:18:32 +00002825 return DeclPtrTy::make(D);
Chris Lattnercc98eac2008-12-17 07:13:27 +00002826}
2827
Douglas Gregor074149e2009-01-05 19:45:36 +00002828/// ActOnFinishLinkageSpecification - Completely the definition of
2829/// the C++ linkage specification LinkageSpec. If RBraceLoc is
2830/// valid, it's the position of the closing '}' brace in a linkage
2831/// specification that uses braces.
Chris Lattnerb28317a2009-03-28 19:18:32 +00002832Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S,
2833 DeclPtrTy LinkageSpec,
2834 SourceLocation RBraceLoc) {
Douglas Gregor074149e2009-01-05 19:45:36 +00002835 if (LinkageSpec)
2836 PopDeclContext();
2837 return LinkageSpec;
Chris Lattner5a003a42008-12-17 07:09:26 +00002838}
2839
Douglas Gregord308e622009-05-18 20:51:54 +00002840/// \brief Perform semantic analysis for the variable declaration that
2841/// occurs within a C++ catch clause, returning the newly-created
2842/// variable.
2843VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType,
2844 IdentifierInfo *Name,
2845 SourceLocation Loc,
2846 SourceRange Range) {
2847 bool Invalid = false;
Sebastian Redl4b07b292008-12-22 19:15:10 +00002848
2849 // Arrays and functions decay.
2850 if (ExDeclType->isArrayType())
2851 ExDeclType = Context.getArrayDecayedType(ExDeclType);
2852 else if (ExDeclType->isFunctionType())
2853 ExDeclType = Context.getPointerType(ExDeclType);
2854
2855 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type.
2856 // The exception-declaration shall not denote a pointer or reference to an
2857 // incomplete type, other than [cv] void*.
Sebastian Redlf2e21e52009-03-22 23:49:27 +00002858 // N2844 forbids rvalue references.
Douglas Gregor2f2433f2009-05-18 21:08:14 +00002859 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) {
Douglas Gregord308e622009-05-18 20:51:54 +00002860 Diag(Loc, diag::err_catch_rvalue_ref) << Range;
Sebastian Redlf2e21e52009-03-22 23:49:27 +00002861 Invalid = true;
2862 }
Douglas Gregord308e622009-05-18 20:51:54 +00002863
Sebastian Redl4b07b292008-12-22 19:15:10 +00002864 QualType BaseType = ExDeclType;
2865 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference
Douglas Gregor4ec339f2009-01-19 19:26:10 +00002866 unsigned DK = diag::err_catch_incomplete;
Sebastian Redl4b07b292008-12-22 19:15:10 +00002867 if (const PointerType *Ptr = BaseType->getAsPointerType()) {
2868 BaseType = Ptr->getPointeeType();
2869 Mode = 1;
Douglas Gregor4ec339f2009-01-19 19:26:10 +00002870 DK = diag::err_catch_incomplete_ptr;
Sebastian Redl4b07b292008-12-22 19:15:10 +00002871 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) {
Sebastian Redlf2e21e52009-03-22 23:49:27 +00002872 // For the purpose of error recovery, we treat rvalue refs like lvalue refs.
Sebastian Redl4b07b292008-12-22 19:15:10 +00002873 BaseType = Ref->getPointeeType();
2874 Mode = 2;
Douglas Gregor4ec339f2009-01-19 19:26:10 +00002875 DK = diag::err_catch_incomplete_ref;
Sebastian Redl4b07b292008-12-22 19:15:10 +00002876 }
Sebastian Redlf2e21e52009-03-22 23:49:27 +00002877 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) &&
Douglas Gregord308e622009-05-18 20:51:54 +00002878 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK))
Sebastian Redl4b07b292008-12-22 19:15:10 +00002879 Invalid = true;
Sebastian Redl4b07b292008-12-22 19:15:10 +00002880
Douglas Gregord308e622009-05-18 20:51:54 +00002881 if (!Invalid && !ExDeclType->isDependentType() &&
2882 RequireNonAbstractType(Loc, ExDeclType,
2883 diag::err_abstract_type_in_decl,
2884 AbstractVariableType))
Sebastian Redlfef9f592009-04-27 21:03:30 +00002885 Invalid = true;
2886
Douglas Gregord308e622009-05-18 20:51:54 +00002887 // FIXME: Need to test for ability to copy-construct and destroy the
2888 // exception variable.
2889
Sebastian Redl8351da02008-12-22 21:35:02 +00002890 // FIXME: Need to check for abstract classes.
2891
Douglas Gregord308e622009-05-18 20:51:54 +00002892 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc,
2893 Name, ExDeclType, VarDecl::None,
2894 Range.getBegin());
2895
2896 if (Invalid)
2897 ExDecl->setInvalidDecl();
2898
2899 return ExDecl;
2900}
2901
2902/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch
2903/// handler.
2904Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) {
2905 QualType ExDeclType = GetTypeForDeclarator(D, S);
2906
2907 bool Invalid = D.isInvalidType();
Sebastian Redl4b07b292008-12-22 19:15:10 +00002908 IdentifierInfo *II = D.getIdentifier();
Douglas Gregor47b9a1c2009-02-04 17:27:36 +00002909 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) {
Sebastian Redl4b07b292008-12-22 19:15:10 +00002910 // The scope should be freshly made just for us. There is just no way
2911 // it contains any previous declaration.
Chris Lattnerb28317a2009-03-28 19:18:32 +00002912 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl)));
Sebastian Redl4b07b292008-12-22 19:15:10 +00002913 if (PrevDecl->isTemplateParameter()) {
2914 // Maybe we will complain about the shadowed template parameter.
2915 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
Sebastian Redl4b07b292008-12-22 19:15:10 +00002916 }
2917 }
2918
Chris Lattnereaaebc72009-04-25 08:06:05 +00002919 if (D.getCXXScopeSpec().isSet() && !Invalid) {
Sebastian Redl4b07b292008-12-22 19:15:10 +00002920 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator)
2921 << D.getCXXScopeSpec().getRange();
Chris Lattnereaaebc72009-04-25 08:06:05 +00002922 Invalid = true;
Sebastian Redl4b07b292008-12-22 19:15:10 +00002923 }
2924
Douglas Gregord308e622009-05-18 20:51:54 +00002925 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType,
2926 D.getIdentifier(),
2927 D.getIdentifierLoc(),
2928 D.getDeclSpec().getSourceRange());
2929
Chris Lattnereaaebc72009-04-25 08:06:05 +00002930 if (Invalid)
2931 ExDecl->setInvalidDecl();
2932
Sebastian Redl4b07b292008-12-22 19:15:10 +00002933 // Add the exception declaration into this scope.
Sebastian Redl4b07b292008-12-22 19:15:10 +00002934 if (II)
Douglas Gregord308e622009-05-18 20:51:54 +00002935 PushOnScopeChains(ExDecl, S);
2936 else
2937 CurContext->addDecl(Context, ExDecl);
Sebastian Redl4b07b292008-12-22 19:15:10 +00002938
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00002939 ProcessDeclAttributes(S, ExDecl, D);
Chris Lattnerb28317a2009-03-28 19:18:32 +00002940 return DeclPtrTy::make(ExDecl);
Sebastian Redl4b07b292008-12-22 19:15:10 +00002941}
Anders Carlssonfb311762009-03-14 00:25:26 +00002942
Chris Lattnerb28317a2009-03-28 19:18:32 +00002943Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc,
2944 ExprArg assertexpr,
2945 ExprArg assertmessageexpr) {
Anders Carlssonfb311762009-03-14 00:25:26 +00002946 Expr *AssertExpr = (Expr *)assertexpr.get();
2947 StringLiteral *AssertMessage =
2948 cast<StringLiteral>((Expr *)assertmessageexpr.get());
2949
Anders Carlssonc3082412009-03-14 00:33:21 +00002950 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) {
2951 llvm::APSInt Value(32);
2952 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) {
2953 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) <<
2954 AssertExpr->getSourceRange();
Chris Lattnerb28317a2009-03-28 19:18:32 +00002955 return DeclPtrTy();
Anders Carlssonc3082412009-03-14 00:33:21 +00002956 }
Anders Carlssonfb311762009-03-14 00:25:26 +00002957
Anders Carlssonc3082412009-03-14 00:33:21 +00002958 if (Value == 0) {
2959 std::string str(AssertMessage->getStrData(),
2960 AssertMessage->getByteLength());
Anders Carlsson94b15fb2009-03-15 18:44:04 +00002961 Diag(AssertLoc, diag::err_static_assert_failed)
2962 << str << AssertExpr->getSourceRange();
Anders Carlssonc3082412009-03-14 00:33:21 +00002963 }
2964 }
2965
Anders Carlsson77d81422009-03-15 17:35:16 +00002966 assertexpr.release();
2967 assertmessageexpr.release();
Anders Carlssonfb311762009-03-14 00:25:26 +00002968 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc,
2969 AssertExpr, AssertMessage);
Anders Carlssonfb311762009-03-14 00:25:26 +00002970
Douglas Gregor6ab35242009-04-09 21:40:53 +00002971 CurContext->addDecl(Context, Decl);
Chris Lattnerb28317a2009-03-28 19:18:32 +00002972 return DeclPtrTy::make(Decl);
Anders Carlssonfb311762009-03-14 00:25:26 +00002973}
Sebastian Redl50de12f2009-03-24 22:27:57 +00002974
Anders Carlsson00338362009-05-11 22:55:49 +00002975bool Sema::ActOnFriendDecl(Scope *S, SourceLocation FriendLoc, DeclPtrTy Dcl) {
2976 if (!(S->getFlags() & Scope::ClassScope)) {
2977 Diag(FriendLoc, diag::err_friend_decl_outside_class);
2978 return true;
2979 }
2980
2981 return false;
2982}
2983
Chris Lattnerb28317a2009-03-28 19:18:32 +00002984void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) {
2985 Decl *Dcl = dcl.getAs<Decl>();
Sebastian Redl50de12f2009-03-24 22:27:57 +00002986 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl);
2987 if (!Fn) {
2988 Diag(DelLoc, diag::err_deleted_non_function);
2989 return;
2990 }
2991 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) {
2992 Diag(DelLoc, diag::err_deleted_decl_not_first);
2993 Diag(Prev->getLocation(), diag::note_previous_declaration);
2994 // If the declaration wasn't the first, we delete the function anyway for
2995 // recovery.
2996 }
2997 Fn->setDeleted();
2998}
Sebastian Redl13e88542009-04-27 21:33:24 +00002999
3000static void SearchForReturnInStmt(Sema &Self, Stmt *S) {
3001 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E;
3002 ++CI) {
3003 Stmt *SubStmt = *CI;
3004 if (!SubStmt)
3005 continue;
3006 if (isa<ReturnStmt>(SubStmt))
3007 Self.Diag(SubStmt->getSourceRange().getBegin(),
3008 diag::err_return_in_constructor_handler);
3009 if (!isa<Expr>(SubStmt))
3010 SearchForReturnInStmt(Self, SubStmt);
3011 }
3012}
3013
3014void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) {
3015 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) {
3016 CXXCatchStmt *Handler = TryBlock->getHandler(I);
3017 SearchForReturnInStmt(*this, Handler);
3018 }
3019}
Anders Carlssond7ba27d2009-05-14 01:09:04 +00003020
3021bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New,
3022 const CXXMethodDecl *Old) {
3023 QualType NewTy = New->getType()->getAsFunctionType()->getResultType();
3024 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType();
3025
3026 QualType CNewTy = Context.getCanonicalType(NewTy);
3027 QualType COldTy = Context.getCanonicalType(OldTy);
3028
3029 if (CNewTy == COldTy &&
3030 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers())
3031 return false;
3032
Anders Carlssonc3a68b22009-05-14 19:52:19 +00003033 // Check if the return types are covariant
3034 QualType NewClassTy, OldClassTy;
3035
3036 /// Both types must be pointers or references to classes.
3037 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) {
3038 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) {
3039 NewClassTy = NewPT->getPointeeType();
3040 OldClassTy = OldPT->getPointeeType();
3041 }
3042 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) {
3043 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) {
3044 NewClassTy = NewRT->getPointeeType();
3045 OldClassTy = OldRT->getPointeeType();
3046 }
3047 }
3048
3049 // The return types aren't either both pointers or references to a class type.
3050 if (NewClassTy.isNull()) {
3051 Diag(New->getLocation(),
3052 diag::err_different_return_type_for_overriding_virtual_function)
3053 << New->getDeclName() << NewTy << OldTy;
3054 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
3055
3056 return true;
3057 }
Anders Carlssond7ba27d2009-05-14 01:09:04 +00003058
Anders Carlssonc3a68b22009-05-14 19:52:19 +00003059 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) {
3060 // Check if the new class derives from the old class.
3061 if (!IsDerivedFrom(NewClassTy, OldClassTy)) {
3062 Diag(New->getLocation(),
3063 diag::err_covariant_return_not_derived)
3064 << New->getDeclName() << NewTy << OldTy;
3065 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
3066 return true;
3067 }
3068
3069 // Check if we the conversion from derived to base is valid.
3070 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy,
3071 diag::err_covariant_return_inaccessible_base,
3072 diag::err_covariant_return_ambiguous_derived_to_base_conv,
3073 // FIXME: Should this point to the return type?
3074 New->getLocation(), SourceRange(), New->getDeclName())) {
3075 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
3076 return true;
3077 }
3078 }
3079
3080 // The qualifiers of the return types must be the same.
3081 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) {
3082 Diag(New->getLocation(),
3083 diag::err_covariant_return_type_different_qualifications)
Anders Carlssond7ba27d2009-05-14 01:09:04 +00003084 << New->getDeclName() << NewTy << OldTy;
Anders Carlssonc3a68b22009-05-14 19:52:19 +00003085 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
3086 return true;
3087 };
3088
3089
3090 // The new class type must have the same or less qualifiers as the old type.
3091 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) {
3092 Diag(New->getLocation(),
3093 diag::err_covariant_return_type_class_type_more_qualified)
3094 << New->getDeclName() << NewTy << OldTy;
3095 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
3096 return true;
3097 };
3098
3099 return false;
Anders Carlssond7ba27d2009-05-14 01:09:04 +00003100}
Argyrios Kyrtzidis0ffd9ff2009-06-17 22:50:06 +00003101
3102/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an
3103/// initializer for the declaration 'Dcl'.
3104/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a
3105/// static data member of class X, names should be looked up in the scope of
3106/// class X.
3107void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) {
3108 Decl *D = Dcl.getAs<Decl>();
3109 // If there is no declaration, there was an error parsing it.
3110 if (D == 0)
3111 return;
3112
3113 // Check whether it is a declaration with a nested name specifier like
3114 // int foo::bar;
3115 if (!D->isOutOfLine())
3116 return;
3117
3118 // C++ [basic.lookup.unqual]p13
3119 //
3120 // A name used in the definition of a static data member of class X
3121 // (after the qualified-id of the static member) is looked up as if the name
3122 // was used in a member function of X.
3123
3124 // Change current context into the context of the initializing declaration.
Argyrios Kyrtzidis1d175532009-06-17 23:15:40 +00003125 EnterDeclaratorContext(S, D->getDeclContext());
Argyrios Kyrtzidis0ffd9ff2009-06-17 22:50:06 +00003126}
3127
3128/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an
3129/// initializer for the declaration 'Dcl'.
3130void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) {
3131 Decl *D = Dcl.getAs<Decl>();
3132 // If there is no declaration, there was an error parsing it.
3133 if (D == 0)
3134 return;
3135
3136 // Check whether it is a declaration with a nested name specifier like
3137 // int foo::bar;
3138 if (!D->isOutOfLine())
3139 return;
3140
3141 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!");
Argyrios Kyrtzidis1d175532009-06-17 23:15:40 +00003142 ExitDeclaratorContext(S);
Argyrios Kyrtzidis0ffd9ff2009-06-17 22:50:06 +00003143}