Bug Summary

File:tools/clang/lib/Sema/SemaDeclCXX.cpp
Warning:line 619, column 40
Called C++ object pointer is null

Annotated Source Code

1//===------ 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 "clang/AST/ASTConsumer.h"
15#include "clang/AST/ASTContext.h"
16#include "clang/AST/ASTLambda.h"
17#include "clang/AST/ASTMutationListener.h"
18#include "clang/AST/CXXInheritance.h"
19#include "clang/AST/CharUnits.h"
20#include "clang/AST/EvaluatedExprVisitor.h"
21#include "clang/AST/ExprCXX.h"
22#include "clang/AST/RecordLayout.h"
23#include "clang/AST/RecursiveASTVisitor.h"
24#include "clang/AST/StmtVisitor.h"
25#include "clang/AST/TypeLoc.h"
26#include "clang/AST/TypeOrdering.h"
27#include "clang/Basic/PartialDiagnostic.h"
28#include "clang/Basic/TargetInfo.h"
29#include "clang/Lex/LiteralSupport.h"
30#include "clang/Lex/Preprocessor.h"
31#include "clang/Sema/CXXFieldCollector.h"
32#include "clang/Sema/DeclSpec.h"
33#include "clang/Sema/Initialization.h"
34#include "clang/Sema/Lookup.h"
35#include "clang/Sema/ParsedTemplate.h"
36#include "clang/Sema/Scope.h"
37#include "clang/Sema/ScopeInfo.h"
38#include "clang/Sema/SemaInternal.h"
39#include "clang/Sema/Template.h"
40#include "llvm/ADT/STLExtras.h"
41#include "llvm/ADT/SmallString.h"
42#include "llvm/ADT/StringExtras.h"
43#include <map>
44#include <set>
45
46using namespace clang;
47
48//===----------------------------------------------------------------------===//
49// CheckDefaultArgumentVisitor
50//===----------------------------------------------------------------------===//
51
52namespace {
53 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses
54 /// the default argument of a parameter to determine whether it
55 /// contains any ill-formed subexpressions. For example, this will
56 /// diagnose the use of local variables or parameters within the
57 /// default argument expression.
58 class CheckDefaultArgumentVisitor
59 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> {
60 Expr *DefaultArg;
61 Sema *S;
62
63 public:
64 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s)
65 : DefaultArg(defarg), S(s) {}
66
67 bool VisitExpr(Expr *Node);
68 bool VisitDeclRefExpr(DeclRefExpr *DRE);
69 bool VisitCXXThisExpr(CXXThisExpr *ThisE);
70 bool VisitLambdaExpr(LambdaExpr *Lambda);
71 bool VisitPseudoObjectExpr(PseudoObjectExpr *POE);
72 };
73
74 /// VisitExpr - Visit all of the children of this expression.
75 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) {
76 bool IsInvalid = false;
77 for (Stmt *SubStmt : Node->children())
78 IsInvalid |= Visit(SubStmt);
79 return IsInvalid;
80 }
81
82 /// VisitDeclRefExpr - Visit a reference to a declaration, to
83 /// determine whether this declaration can be used in the default
84 /// argument expression.
85 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) {
86 NamedDecl *Decl = DRE->getDecl();
87 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) {
88 // C++ [dcl.fct.default]p9
89 // Default arguments are evaluated each time the function is
90 // called. The order of evaluation of function arguments is
91 // unspecified. Consequently, parameters of a function shall not
92 // be used in default argument expressions, even if they are not
93 // evaluated. Parameters of a function declared before a default
94 // argument expression are in scope and can hide namespace and
95 // class member names.
96 return S->Diag(DRE->getLocStart(),
97 diag::err_param_default_argument_references_param)
98 << Param->getDeclName() << DefaultArg->getSourceRange();
99 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) {
100 // C++ [dcl.fct.default]p7
101 // Local variables shall not be used in default argument
102 // expressions.
103 if (VDecl->isLocalVarDecl())
104 return S->Diag(DRE->getLocStart(),
105 diag::err_param_default_argument_references_local)
106 << VDecl->getDeclName() << DefaultArg->getSourceRange();
107 }
108
109 return false;
110 }
111
112 /// VisitCXXThisExpr - Visit a C++ "this" expression.
113 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) {
114 // C++ [dcl.fct.default]p8:
115 // The keyword this shall not be used in a default argument of a
116 // member function.
117 return S->Diag(ThisE->getLocStart(),
118 diag::err_param_default_argument_references_this)
119 << ThisE->getSourceRange();
120 }
121
122 bool CheckDefaultArgumentVisitor::VisitPseudoObjectExpr(PseudoObjectExpr *POE) {
123 bool Invalid = false;
124 for (PseudoObjectExpr::semantics_iterator
125 i = POE->semantics_begin(), e = POE->semantics_end(); i != e; ++i) {
126 Expr *E = *i;
127
128 // Look through bindings.
129 if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(E)) {
130 E = OVE->getSourceExpr();
131 assert(E && "pseudo-object binding without source expression?")((E && "pseudo-object binding without source expression?"
) ? static_cast<void> (0) : __assert_fail ("E && \"pseudo-object binding without source expression?\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 131, __PRETTY_FUNCTION__))
;
132 }
133
134 Invalid |= Visit(E);
135 }
136 return Invalid;
137 }
138
139 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) {
140 // C++11 [expr.lambda.prim]p13:
141 // A lambda-expression appearing in a default argument shall not
142 // implicitly or explicitly capture any entity.
143 if (Lambda->capture_begin() == Lambda->capture_end())
144 return false;
145
146 return S->Diag(Lambda->getLocStart(),
147 diag::err_lambda_capture_default_arg);
148 }
149}
150
151void
152Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc,
153 const CXXMethodDecl *Method) {
154 // If we have an MSAny spec already, don't bother.
155 if (!Method || ComputedEST == EST_MSAny)
156 return;
157
158 const FunctionProtoType *Proto
159 = Method->getType()->getAs<FunctionProtoType>();
160 Proto = Self->ResolveExceptionSpec(CallLoc, Proto);
161 if (!Proto)
162 return;
163
164 ExceptionSpecificationType EST = Proto->getExceptionSpecType();
165
166 // If we have a throw-all spec at this point, ignore the function.
167 if (ComputedEST == EST_None)
168 return;
169
170 switch(EST) {
171 // If this function can throw any exceptions, make a note of that.
172 case EST_MSAny:
173 case EST_None:
174 ClearExceptions();
175 ComputedEST = EST;
176 return;
177 // FIXME: If the call to this decl is using any of its default arguments, we
178 // need to search them for potentially-throwing calls.
179 // If this function has a basic noexcept, it doesn't affect the outcome.
180 case EST_BasicNoexcept:
181 return;
182 // If we're still at noexcept(true) and there's a nothrow() callee,
183 // change to that specification.
184 case EST_DynamicNone:
185 if (ComputedEST == EST_BasicNoexcept)
186 ComputedEST = EST_DynamicNone;
187 return;
188 // Check out noexcept specs.
189 case EST_ComputedNoexcept:
190 {
191 FunctionProtoType::NoexceptResult NR =
192 Proto->getNoexceptSpec(Self->Context);
193 assert(NR != FunctionProtoType::NR_NoNoexcept &&((NR != FunctionProtoType::NR_NoNoexcept && "Must have noexcept result for EST_ComputedNoexcept."
) ? static_cast<void> (0) : __assert_fail ("NR != FunctionProtoType::NR_NoNoexcept && \"Must have noexcept result for EST_ComputedNoexcept.\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 194, __PRETTY_FUNCTION__))
194 "Must have noexcept result for EST_ComputedNoexcept.")((NR != FunctionProtoType::NR_NoNoexcept && "Must have noexcept result for EST_ComputedNoexcept."
) ? static_cast<void> (0) : __assert_fail ("NR != FunctionProtoType::NR_NoNoexcept && \"Must have noexcept result for EST_ComputedNoexcept.\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 194, __PRETTY_FUNCTION__))
;
195 assert(NR != FunctionProtoType::NR_Dependent &&((NR != FunctionProtoType::NR_Dependent && "Should not generate implicit declarations for dependent cases, "
"and don't know how to handle them anyway.") ? static_cast<
void> (0) : __assert_fail ("NR != FunctionProtoType::NR_Dependent && \"Should not generate implicit declarations for dependent cases, \" \"and don't know how to handle them anyway.\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 197, __PRETTY_FUNCTION__))
196 "Should not generate implicit declarations for dependent cases, "((NR != FunctionProtoType::NR_Dependent && "Should not generate implicit declarations for dependent cases, "
"and don't know how to handle them anyway.") ? static_cast<
void> (0) : __assert_fail ("NR != FunctionProtoType::NR_Dependent && \"Should not generate implicit declarations for dependent cases, \" \"and don't know how to handle them anyway.\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 197, __PRETTY_FUNCTION__))
197 "and don't know how to handle them anyway.")((NR != FunctionProtoType::NR_Dependent && "Should not generate implicit declarations for dependent cases, "
"and don't know how to handle them anyway.") ? static_cast<
void> (0) : __assert_fail ("NR != FunctionProtoType::NR_Dependent && \"Should not generate implicit declarations for dependent cases, \" \"and don't know how to handle them anyway.\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 197, __PRETTY_FUNCTION__))
;
198 // noexcept(false) -> no spec on the new function
199 if (NR == FunctionProtoType::NR_Throw) {
200 ClearExceptions();
201 ComputedEST = EST_None;
202 }
203 // noexcept(true) won't change anything either.
204 return;
205 }
206 default:
207 break;
208 }
209 assert(EST == EST_Dynamic && "EST case not considered earlier.")((EST == EST_Dynamic && "EST case not considered earlier."
) ? static_cast<void> (0) : __assert_fail ("EST == EST_Dynamic && \"EST case not considered earlier.\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 209, __PRETTY_FUNCTION__))
;
210 assert(ComputedEST != EST_None &&((ComputedEST != EST_None && "Shouldn't collect exceptions when throw-all is guaranteed."
) ? static_cast<void> (0) : __assert_fail ("ComputedEST != EST_None && \"Shouldn't collect exceptions when throw-all is guaranteed.\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 211, __PRETTY_FUNCTION__))
211 "Shouldn't collect exceptions when throw-all is guaranteed.")((ComputedEST != EST_None && "Shouldn't collect exceptions when throw-all is guaranteed."
) ? static_cast<void> (0) : __assert_fail ("ComputedEST != EST_None && \"Shouldn't collect exceptions when throw-all is guaranteed.\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 211, __PRETTY_FUNCTION__))
;
212 ComputedEST = EST_Dynamic;
213 // Record the exceptions in this function's exception specification.
214 for (const auto &E : Proto->exceptions())
215 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(E)).second)
216 Exceptions.push_back(E);
217}
218
219void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) {
220 if (!E || ComputedEST == EST_MSAny)
221 return;
222
223 // FIXME:
224 //
225 // C++0x [except.spec]p14:
226 // [An] implicit exception-specification specifies the type-id T if and
227 // only if T is allowed by the exception-specification of a function directly
228 // invoked by f's implicit definition; f shall allow all exceptions if any
229 // function it directly invokes allows all exceptions, and f shall allow no
230 // exceptions if every function it directly invokes allows no exceptions.
231 //
232 // Note in particular that if an implicit exception-specification is generated
233 // for a function containing a throw-expression, that specification can still
234 // be noexcept(true).
235 //
236 // Note also that 'directly invoked' is not defined in the standard, and there
237 // is no indication that we should only consider potentially-evaluated calls.
238 //
239 // Ultimately we should implement the intent of the standard: the exception
240 // specification should be the set of exceptions which can be thrown by the
241 // implicit definition. For now, we assume that any non-nothrow expression can
242 // throw any exception.
243
244 if (Self->canThrow(E))
245 ComputedEST = EST_None;
246}
247
248bool
249Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg,
250 SourceLocation EqualLoc) {
251 if (RequireCompleteType(Param->getLocation(), Param->getType(),
252 diag::err_typecheck_decl_incomplete_type)) {
253 Param->setInvalidDecl();
254 return true;
255 }
256
257 // C++ [dcl.fct.default]p5
258 // A default argument expression is implicitly converted (clause
259 // 4) to the parameter type. The default argument expression has
260 // the same semantic constraints as the initializer expression in
261 // a declaration of a variable of the parameter type, using the
262 // copy-initialization semantics (8.5).
263 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
264 Param);
265 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(),
266 EqualLoc);
267 InitializationSequence InitSeq(*this, Entity, Kind, Arg);
268 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Arg);
269 if (Result.isInvalid())
270 return true;
271 Arg = Result.getAs<Expr>();
272
273 CheckCompletedExpr(Arg, EqualLoc);
274 Arg = MaybeCreateExprWithCleanups(Arg);
275
276 // Okay: add the default argument to the parameter
277 Param->setDefaultArg(Arg);
278
279 // We have already instantiated this parameter; provide each of the
280 // instantiations with the uninstantiated default argument.
281 UnparsedDefaultArgInstantiationsMap::iterator InstPos
282 = UnparsedDefaultArgInstantiations.find(Param);
283 if (InstPos != UnparsedDefaultArgInstantiations.end()) {
284 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I)
285 InstPos->second[I]->setUninstantiatedDefaultArg(Arg);
286
287 // We're done tracking this parameter's instantiations.
288 UnparsedDefaultArgInstantiations.erase(InstPos);
289 }
290
291 return false;
292}
293
294/// ActOnParamDefaultArgument - Check whether the default argument
295/// provided for a function parameter is well-formed. If so, attach it
296/// to the parameter declaration.
297void
298Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc,
299 Expr *DefaultArg) {
300 if (!param || !DefaultArg)
301 return;
302
303 ParmVarDecl *Param = cast<ParmVarDecl>(param);
304 UnparsedDefaultArgLocs.erase(Param);
305
306 // Default arguments are only permitted in C++
307 if (!getLangOpts().CPlusPlus) {
308 Diag(EqualLoc, diag::err_param_default_argument)
309 << DefaultArg->getSourceRange();
310 Param->setInvalidDecl();
311 return;
312 }
313
314 // Check for unexpanded parameter packs.
315 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) {
316 Param->setInvalidDecl();
317 return;
318 }
319
320 // C++11 [dcl.fct.default]p3
321 // A default argument expression [...] shall not be specified for a
322 // parameter pack.
323 if (Param->isParameterPack()) {
324 Diag(EqualLoc, diag::err_param_default_argument_on_parameter_pack)
325 << DefaultArg->getSourceRange();
326 return;
327 }
328
329 // Check that the default argument is well-formed
330 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this);
331 if (DefaultArgChecker.Visit(DefaultArg)) {
332 Param->setInvalidDecl();
333 return;
334 }
335
336 SetParamDefaultArgument(Param, DefaultArg, EqualLoc);
337}
338
339/// ActOnParamUnparsedDefaultArgument - We've seen a default
340/// argument for a function parameter, but we can't parse it yet
341/// because we're inside a class definition. Note that this default
342/// argument will be parsed later.
343void Sema::ActOnParamUnparsedDefaultArgument(Decl *param,
344 SourceLocation EqualLoc,
345 SourceLocation ArgLoc) {
346 if (!param)
347 return;
348
349 ParmVarDecl *Param = cast<ParmVarDecl>(param);
350 Param->setUnparsedDefaultArg();
351 UnparsedDefaultArgLocs[Param] = ArgLoc;
352}
353
354/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of
355/// the default argument for the parameter param failed.
356void Sema::ActOnParamDefaultArgumentError(Decl *param,
357 SourceLocation EqualLoc) {
358 if (!param)
359 return;
360
361 ParmVarDecl *Param = cast<ParmVarDecl>(param);
362 Param->setInvalidDecl();
363 UnparsedDefaultArgLocs.erase(Param);
364 Param->setDefaultArg(new(Context)
365 OpaqueValueExpr(EqualLoc,
366 Param->getType().getNonReferenceType(),
367 VK_RValue));
368}
369
370/// CheckExtraCXXDefaultArguments - Check for any extra default
371/// arguments in the declarator, which is not a function declaration
372/// or definition and therefore is not permitted to have default
373/// arguments. This routine should be invoked for every declarator
374/// that is not a function declaration or definition.
375void Sema::CheckExtraCXXDefaultArguments(Declarator &D) {
376 // C++ [dcl.fct.default]p3
377 // A default argument expression shall be specified only in the
378 // parameter-declaration-clause of a function declaration or in a
379 // template-parameter (14.1). It shall not be specified for a
380 // parameter pack. If it is specified in a
381 // parameter-declaration-clause, it shall not occur within a
382 // declarator or abstract-declarator of a parameter-declaration.
383 bool MightBeFunction = D.isFunctionDeclarationContext();
384 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
385 DeclaratorChunk &chunk = D.getTypeObject(i);
386 if (chunk.Kind == DeclaratorChunk::Function) {
387 if (MightBeFunction) {
388 // This is a function declaration. It can have default arguments, but
389 // keep looking in case its return type is a function type with default
390 // arguments.
391 MightBeFunction = false;
392 continue;
393 }
394 for (unsigned argIdx = 0, e = chunk.Fun.NumParams; argIdx != e;
395 ++argIdx) {
396 ParmVarDecl *Param = cast<ParmVarDecl>(chunk.Fun.Params[argIdx].Param);
397 if (Param->hasUnparsedDefaultArg()) {
398 std::unique_ptr<CachedTokens> Toks =
399 std::move(chunk.Fun.Params[argIdx].DefaultArgTokens);
400 SourceRange SR;
401 if (Toks->size() > 1)
402 SR = SourceRange((*Toks)[1].getLocation(),
403 Toks->back().getLocation());
404 else
405 SR = UnparsedDefaultArgLocs[Param];
406 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc)
407 << SR;
408 } else if (Param->getDefaultArg()) {
409 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc)
410 << Param->getDefaultArg()->getSourceRange();
411 Param->setDefaultArg(nullptr);
412 }
413 }
414 } else if (chunk.Kind != DeclaratorChunk::Paren) {
415 MightBeFunction = false;
416 }
417 }
418}
419
420static bool functionDeclHasDefaultArgument(const FunctionDecl *FD) {
421 for (unsigned NumParams = FD->getNumParams(); NumParams > 0; --NumParams) {
422 const ParmVarDecl *PVD = FD->getParamDecl(NumParams-1);
423 if (!PVD->hasDefaultArg())
424 return false;
425 if (!PVD->hasInheritedDefaultArg())
426 return true;
427 }
428 return false;
429}
430
431/// MergeCXXFunctionDecl - Merge two declarations of the same C++
432/// function, once we already know that they have the same
433/// type. Subroutine of MergeFunctionDecl. Returns true if there was an
434/// error, false otherwise.
435bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old,
436 Scope *S) {
437 bool Invalid = false;
438
439 // The declaration context corresponding to the scope is the semantic
440 // parent, unless this is a local function declaration, in which case
441 // it is that surrounding function.
442 DeclContext *ScopeDC = New->isLocalExternDecl()
1
Assuming the condition is false
2
'?' condition is false
443 ? New->getLexicalDeclContext()
444 : New->getDeclContext();
445
446 // Find the previous declaration for the purpose of default arguments.
447 FunctionDecl *PrevForDefaultArgs = Old;
448 for (/**/; PrevForDefaultArgs;
3
Assuming pointer value is null
4
Loop condition is false. Execution continues on line 496
449 // Don't bother looking back past the latest decl if this is a local
450 // extern declaration; nothing else could work.
451 PrevForDefaultArgs = New->isLocalExternDecl()
452 ? nullptr
453 : PrevForDefaultArgs->getPreviousDecl()) {
454 // Ignore hidden declarations.
455 if (!LookupResult::isVisible(*this, PrevForDefaultArgs))
456 continue;
457
458 if (S && !isDeclInScope(PrevForDefaultArgs, ScopeDC, S) &&
459 !New->isCXXClassMember()) {
460 // Ignore default arguments of old decl if they are not in
461 // the same scope and this is not an out-of-line definition of
462 // a member function.
463 continue;
464 }
465
466 if (PrevForDefaultArgs->isLocalExternDecl() != New->isLocalExternDecl()) {
467 // If only one of these is a local function declaration, then they are
468 // declared in different scopes, even though isDeclInScope may think
469 // they're in the same scope. (If both are local, the scope check is
470 // sufficent, and if neither is local, then they are in the same scope.)
471 continue;
472 }
473
474 // We found the right previous declaration.
475 break;
476 }
477
478 // C++ [dcl.fct.default]p4:
479 // For non-template functions, default arguments can be added in
480 // later declarations of a function in the same
481 // scope. Declarations in different scopes have completely
482 // distinct sets of default arguments. That is, declarations in
483 // inner scopes do not acquire default arguments from
484 // declarations in outer scopes, and vice versa. In a given
485 // function declaration, all parameters subsequent to a
486 // parameter with a default argument shall have default
487 // arguments supplied in this or previous declarations. A
488 // default argument shall not be redefined by a later
489 // declaration (not even to the same value).
490 //
491 // C++ [dcl.fct.default]p6:
492 // Except for member functions of class templates, the default arguments
493 // in a member function definition that appears outside of the class
494 // definition are added to the set of default arguments provided by the
495 // member function declaration in the class definition.
496 for (unsigned p = 0, NumParams = PrevForDefaultArgs
5
'?' condition is false
6
Loop condition is false. Execution continues on line 618
497 ? PrevForDefaultArgs->getNumParams()
498 : 0;
499 p < NumParams; ++p) {
500 ParmVarDecl *OldParam = PrevForDefaultArgs->getParamDecl(p);
501 ParmVarDecl *NewParam = New->getParamDecl(p);
502
503 bool OldParamHasDfl = OldParam ? OldParam->hasDefaultArg() : false;
504 bool NewParamHasDfl = NewParam->hasDefaultArg();
505
506 if (OldParamHasDfl && NewParamHasDfl) {
507 unsigned DiagDefaultParamID =
508 diag::err_param_default_argument_redefinition;
509
510 // MSVC accepts that default parameters be redefined for member functions
511 // of template class. The new default parameter's value is ignored.
512 Invalid = true;
513 if (getLangOpts().MicrosoftExt) {
514 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(New);
515 if (MD && MD->getParent()->getDescribedClassTemplate()) {
516 // Merge the old default argument into the new parameter.
517 NewParam->setHasInheritedDefaultArg();
518 if (OldParam->hasUninstantiatedDefaultArg())
519 NewParam->setUninstantiatedDefaultArg(
520 OldParam->getUninstantiatedDefaultArg());
521 else
522 NewParam->setDefaultArg(OldParam->getInit());
523 DiagDefaultParamID = diag::ext_param_default_argument_redefinition;
524 Invalid = false;
525 }
526 }
527
528 // FIXME: If we knew where the '=' was, we could easily provide a fix-it
529 // hint here. Alternatively, we could walk the type-source information
530 // for NewParam to find the last source location in the type... but it
531 // isn't worth the effort right now. This is the kind of test case that
532 // is hard to get right:
533 // int f(int);
534 // void g(int (*fp)(int) = f);
535 // void g(int (*fp)(int) = &f);
536 Diag(NewParam->getLocation(), DiagDefaultParamID)
537 << NewParam->getDefaultArgRange();
538
539 // Look for the function declaration where the default argument was
540 // actually written, which may be a declaration prior to Old.
541 for (auto Older = PrevForDefaultArgs;
542 OldParam->hasInheritedDefaultArg(); /**/) {
543 Older = Older->getPreviousDecl();
544 OldParam = Older->getParamDecl(p);
545 }
546
547 Diag(OldParam->getLocation(), diag::note_previous_definition)
548 << OldParam->getDefaultArgRange();
549 } else if (OldParamHasDfl) {
550 // Merge the old default argument into the new parameter.
551 // It's important to use getInit() here; getDefaultArg()
552 // strips off any top-level ExprWithCleanups.
553 NewParam->setHasInheritedDefaultArg();
554 if (OldParam->hasUnparsedDefaultArg())
555 NewParam->setUnparsedDefaultArg();
556 else if (OldParam->hasUninstantiatedDefaultArg())
557 NewParam->setUninstantiatedDefaultArg(
558 OldParam->getUninstantiatedDefaultArg());
559 else
560 NewParam->setDefaultArg(OldParam->getInit());
561 } else if (NewParamHasDfl) {
562 if (New->getDescribedFunctionTemplate()) {
563 // Paragraph 4, quoted above, only applies to non-template functions.
564 Diag(NewParam->getLocation(),
565 diag::err_param_default_argument_template_redecl)
566 << NewParam->getDefaultArgRange();
567 Diag(PrevForDefaultArgs->getLocation(),
568 diag::note_template_prev_declaration)
569 << false;
570 } else if (New->getTemplateSpecializationKind()
571 != TSK_ImplicitInstantiation &&
572 New->getTemplateSpecializationKind() != TSK_Undeclared) {
573 // C++ [temp.expr.spec]p21:
574 // Default function arguments shall not be specified in a declaration
575 // or a definition for one of the following explicit specializations:
576 // - the explicit specialization of a function template;
577 // - the explicit specialization of a member function template;
578 // - the explicit specialization of a member function of a class
579 // template where the class template specialization to which the
580 // member function specialization belongs is implicitly
581 // instantiated.
582 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg)
583 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization)
584 << New->getDeclName()
585 << NewParam->getDefaultArgRange();
586 } else if (New->getDeclContext()->isDependentContext()) {
587 // C++ [dcl.fct.default]p6 (DR217):
588 // Default arguments for a member function of a class template shall
589 // be specified on the initial declaration of the member function
590 // within the class template.
591 //
592 // Reading the tea leaves a bit in DR217 and its reference to DR205
593 // leads me to the conclusion that one cannot add default function
594 // arguments for an out-of-line definition of a member function of a
595 // dependent type.
596 int WhichKind = 2;
597 if (CXXRecordDecl *Record
598 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) {
599 if (Record->getDescribedClassTemplate())
600 WhichKind = 0;
601 else if (isa<ClassTemplatePartialSpecializationDecl>(Record))
602 WhichKind = 1;
603 else
604 WhichKind = 2;
605 }
606
607 Diag(NewParam->getLocation(),
608 diag::err_param_default_argument_member_template_redecl)
609 << WhichKind
610 << NewParam->getDefaultArgRange();
611 }
612 }
613 }
614
615 // DR1344: If a default argument is added outside a class definition and that
616 // default argument makes the function a special member function, the program
617 // is ill-formed. This can only happen for constructors.
618 if (isa<CXXConstructorDecl>(New) &&
619 New->getMinRequiredArguments() < Old->getMinRequiredArguments()) {
7
Called C++ object pointer is null
620 CXXSpecialMember NewSM = getSpecialMember(cast<CXXMethodDecl>(New)),
621 OldSM = getSpecialMember(cast<CXXMethodDecl>(Old));
622 if (NewSM != OldSM) {
623 ParmVarDecl *NewParam = New->getParamDecl(New->getMinRequiredArguments());
624 assert(NewParam->hasDefaultArg())((NewParam->hasDefaultArg()) ? static_cast<void> (0)
: __assert_fail ("NewParam->hasDefaultArg()", "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 624, __PRETTY_FUNCTION__))
;
625 Diag(NewParam->getLocation(), diag::err_default_arg_makes_ctor_special)
626 << NewParam->getDefaultArgRange() << NewSM;
627 Diag(Old->getLocation(), diag::note_previous_declaration);
628 }
629 }
630
631 const FunctionDecl *Def;
632 // C++11 [dcl.constexpr]p1: If any declaration of a function or function
633 // template has a constexpr specifier then all its declarations shall
634 // contain the constexpr specifier.
635 if (New->isConstexpr() != Old->isConstexpr()) {
636 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch)
637 << New << New->isConstexpr();
638 Diag(Old->getLocation(), diag::note_previous_declaration);
639 Invalid = true;
640 } else if (!Old->getMostRecentDecl()->isInlined() && New->isInlined() &&
641 Old->isDefined(Def)) {
642 // C++11 [dcl.fcn.spec]p4:
643 // If the definition of a function appears in a translation unit before its
644 // first declaration as inline, the program is ill-formed.
645 Diag(New->getLocation(), diag::err_inline_decl_follows_def) << New;
646 Diag(Def->getLocation(), diag::note_previous_definition);
647 Invalid = true;
648 }
649
650 // C++11 [dcl.fct.default]p4: If a friend declaration specifies a default
651 // argument expression, that declaration shall be a definition and shall be
652 // the only declaration of the function or function template in the
653 // translation unit.
654 if (Old->getFriendObjectKind() == Decl::FOK_Undeclared &&
655 functionDeclHasDefaultArgument(Old)) {
656 Diag(New->getLocation(), diag::err_friend_decl_with_def_arg_redeclared);
657 Diag(Old->getLocation(), diag::note_previous_declaration);
658 Invalid = true;
659 }
660
661 return Invalid;
662}
663
664NamedDecl *
665Sema::ActOnDecompositionDeclarator(Scope *S, Declarator &D,
666 MultiTemplateParamsArg TemplateParamLists) {
667 assert(D.isDecompositionDeclarator())((D.isDecompositionDeclarator()) ? static_cast<void> (0
) : __assert_fail ("D.isDecompositionDeclarator()", "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 667, __PRETTY_FUNCTION__))
;
668 const DecompositionDeclarator &Decomp = D.getDecompositionDeclarator();
669
670 // The syntax only allows a decomposition declarator as a simple-declaration
671 // or a for-range-declaration, but we parse it in more cases than that.
672 if (!D.mayHaveDecompositionDeclarator()) {
673 Diag(Decomp.getLSquareLoc(), diag::err_decomp_decl_context)
674 << Decomp.getSourceRange();
675 return nullptr;
676 }
677
678 if (!TemplateParamLists.empty()) {
679 // FIXME: There's no rule against this, but there are also no rules that
680 // would actually make it usable, so we reject it for now.
681 Diag(TemplateParamLists.front()->getTemplateLoc(),
682 diag::err_decomp_decl_template);
683 return nullptr;
684 }
685
686 Diag(Decomp.getLSquareLoc(), getLangOpts().CPlusPlus1z
687 ? diag::warn_cxx14_compat_decomp_decl
688 : diag::ext_decomp_decl)
689 << Decomp.getSourceRange();
690
691 // The semantic context is always just the current context.
692 DeclContext *const DC = CurContext;
693
694 // C++1z [dcl.dcl]/8:
695 // The decl-specifier-seq shall contain only the type-specifier auto
696 // and cv-qualifiers.
697 auto &DS = D.getDeclSpec();
698 {
699 SmallVector<StringRef, 8> BadSpecifiers;
700 SmallVector<SourceLocation, 8> BadSpecifierLocs;
701 if (auto SCS = DS.getStorageClassSpec()) {
702 BadSpecifiers.push_back(DeclSpec::getSpecifierName(SCS));
703 BadSpecifierLocs.push_back(DS.getStorageClassSpecLoc());
704 }
705 if (auto TSCS = DS.getThreadStorageClassSpec()) {
706 BadSpecifiers.push_back(DeclSpec::getSpecifierName(TSCS));
707 BadSpecifierLocs.push_back(DS.getThreadStorageClassSpecLoc());
708 }
709 if (DS.isConstexprSpecified()) {
710 BadSpecifiers.push_back("constexpr");
711 BadSpecifierLocs.push_back(DS.getConstexprSpecLoc());
712 }
713 if (DS.isInlineSpecified()) {
714 BadSpecifiers.push_back("inline");
715 BadSpecifierLocs.push_back(DS.getInlineSpecLoc());
716 }
717 if (!BadSpecifiers.empty()) {
718 auto &&Err = Diag(BadSpecifierLocs.front(), diag::err_decomp_decl_spec);
719 Err << (int)BadSpecifiers.size()
720 << llvm::join(BadSpecifiers.begin(), BadSpecifiers.end(), " ");
721 // Don't add FixItHints to remove the specifiers; we do still respect
722 // them when building the underlying variable.
723 for (auto Loc : BadSpecifierLocs)
724 Err << SourceRange(Loc, Loc);
725 }
726 // We can't recover from it being declared as a typedef.
727 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef)
728 return nullptr;
729 }
730
731 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
732 QualType R = TInfo->getType();
733
734 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
735 UPPC_DeclarationType))
736 D.setInvalidType();
737
738 // The syntax only allows a single ref-qualifier prior to the decomposition
739 // declarator. No other declarator chunks are permitted. Also check the type
740 // specifier here.
741 if (DS.getTypeSpecType() != DeclSpec::TST_auto ||
742 D.hasGroupingParens() || D.getNumTypeObjects() > 1 ||
743 (D.getNumTypeObjects() == 1 &&
744 D.getTypeObject(0).Kind != DeclaratorChunk::Reference)) {
745 Diag(Decomp.getLSquareLoc(),
746 (D.hasGroupingParens() ||
747 (D.getNumTypeObjects() &&
748 D.getTypeObject(0).Kind == DeclaratorChunk::Paren))
749 ? diag::err_decomp_decl_parens
750 : diag::err_decomp_decl_type)
751 << R;
752
753 // In most cases, there's no actual problem with an explicitly-specified
754 // type, but a function type won't work here, and ActOnVariableDeclarator
755 // shouldn't be called for such a type.
756 if (R->isFunctionType())
757 D.setInvalidType();
758 }
759
760 // Build the BindingDecls.
761 SmallVector<BindingDecl*, 8> Bindings;
762
763 // Build the BindingDecls.
764 for (auto &B : D.getDecompositionDeclarator().bindings()) {
765 // Check for name conflicts.
766 DeclarationNameInfo NameInfo(B.Name, B.NameLoc);
767 LookupResult Previous(*this, NameInfo, LookupOrdinaryName,
768 ForRedeclaration);
769 LookupName(Previous, S,
770 /*CreateBuiltins*/DC->getRedeclContext()->isTranslationUnit());
771
772 // It's not permitted to shadow a template parameter name.
773 if (Previous.isSingleResult() &&
774 Previous.getFoundDecl()->isTemplateParameter()) {
775 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(),
776 Previous.getFoundDecl());
777 Previous.clear();
778 }
779
780 bool ConsiderLinkage = DC->isFunctionOrMethod() &&
781 DS.getStorageClassSpec() == DeclSpec::SCS_extern;
782 FilterLookupForScope(Previous, DC, S, ConsiderLinkage,
783 /*AllowInlineNamespace*/false);
784 if (!Previous.empty()) {
785 auto *Old = Previous.getRepresentativeDecl();
786 Diag(B.NameLoc, diag::err_redefinition) << B.Name;
787 Diag(Old->getLocation(), diag::note_previous_definition);
788 }
789
790 auto *BD = BindingDecl::Create(Context, DC, B.NameLoc, B.Name);
791 PushOnScopeChains(BD, S, true);
792 Bindings.push_back(BD);
793 ParsingInitForAutoVars.insert(BD);
794 }
795
796 // There are no prior lookup results for the variable itself, because it
797 // is unnamed.
798 DeclarationNameInfo NameInfo((IdentifierInfo *)nullptr,
799 Decomp.getLSquareLoc());
800 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration);
801
802 // Build the variable that holds the non-decomposed object.
803 bool AddToScope = true;
804 NamedDecl *New =
805 ActOnVariableDeclarator(S, D, DC, TInfo, Previous,
806 MultiTemplateParamsArg(), AddToScope, Bindings);
807 CurContext->addHiddenDecl(New);
808
809 if (isInOpenMPDeclareTargetContext())
810 checkDeclIsAllowedInOpenMPTarget(nullptr, New);
811
812 return New;
813}
814
815static bool checkSimpleDecomposition(
816 Sema &S, ArrayRef<BindingDecl *> Bindings, ValueDecl *Src,
817 QualType DecompType, const llvm::APSInt &NumElems, QualType ElemType,
818 llvm::function_ref<ExprResult(SourceLocation, Expr *, unsigned)> GetInit) {
819 if ((int64_t)Bindings.size() != NumElems) {
820 S.Diag(Src->getLocation(), diag::err_decomp_decl_wrong_number_bindings)
821 << DecompType << (unsigned)Bindings.size() << NumElems.toString(10)
822 << (NumElems < Bindings.size());
823 return true;
824 }
825
826 unsigned I = 0;
827 for (auto *B : Bindings) {
828 SourceLocation Loc = B->getLocation();
829 ExprResult E = S.BuildDeclRefExpr(Src, DecompType, VK_LValue, Loc);
830 if (E.isInvalid())
831 return true;
832 E = GetInit(Loc, E.get(), I++);
833 if (E.isInvalid())
834 return true;
835 B->setBinding(ElemType, E.get());
836 }
837
838 return false;
839}
840
841static bool checkArrayLikeDecomposition(Sema &S,
842 ArrayRef<BindingDecl *> Bindings,
843 ValueDecl *Src, QualType DecompType,
844 const llvm::APSInt &NumElems,
845 QualType ElemType) {
846 return checkSimpleDecomposition(
847 S, Bindings, Src, DecompType, NumElems, ElemType,
848 [&](SourceLocation Loc, Expr *Base, unsigned I) -> ExprResult {
849 ExprResult E = S.ActOnIntegerConstant(Loc, I);
850 if (E.isInvalid())
851 return ExprError();
852 return S.CreateBuiltinArraySubscriptExpr(Base, Loc, E.get(), Loc);
853 });
854}
855
856static bool checkArrayDecomposition(Sema &S, ArrayRef<BindingDecl*> Bindings,
857 ValueDecl *Src, QualType DecompType,
858 const ConstantArrayType *CAT) {
859 return checkArrayLikeDecomposition(S, Bindings, Src, DecompType,
860 llvm::APSInt(CAT->getSize()),
861 CAT->getElementType());
862}
863
864static bool checkVectorDecomposition(Sema &S, ArrayRef<BindingDecl*> Bindings,
865 ValueDecl *Src, QualType DecompType,
866 const VectorType *VT) {
867 return checkArrayLikeDecomposition(
868 S, Bindings, Src, DecompType, llvm::APSInt::get(VT->getNumElements()),
869 S.Context.getQualifiedType(VT->getElementType(),
870 DecompType.getQualifiers()));
871}
872
873static bool checkComplexDecomposition(Sema &S,
874 ArrayRef<BindingDecl *> Bindings,
875 ValueDecl *Src, QualType DecompType,
876 const ComplexType *CT) {
877 return checkSimpleDecomposition(
878 S, Bindings, Src, DecompType, llvm::APSInt::get(2),
879 S.Context.getQualifiedType(CT->getElementType(),
880 DecompType.getQualifiers()),
881 [&](SourceLocation Loc, Expr *Base, unsigned I) -> ExprResult {
882 return S.CreateBuiltinUnaryOp(Loc, I ? UO_Imag : UO_Real, Base);
883 });
884}
885
886static std::string printTemplateArgs(const PrintingPolicy &PrintingPolicy,
887 TemplateArgumentListInfo &Args) {
888 SmallString<128> SS;
889 llvm::raw_svector_ostream OS(SS);
890 bool First = true;
891 for (auto &Arg : Args.arguments()) {
892 if (!First)
893 OS << ", ";
894 Arg.getArgument().print(PrintingPolicy, OS);
895 First = false;
896 }
897 return OS.str();
898}
899
900static bool lookupStdTypeTraitMember(Sema &S, LookupResult &TraitMemberLookup,
901 SourceLocation Loc, StringRef Trait,
902 TemplateArgumentListInfo &Args,
903 unsigned DiagID) {
904 auto DiagnoseMissing = [&] {
905 if (DiagID)
906 S.Diag(Loc, DiagID) << printTemplateArgs(S.Context.getPrintingPolicy(),
907 Args);
908 return true;
909 };
910
911 // FIXME: Factor out duplication with lookupPromiseType in SemaCoroutine.
912 NamespaceDecl *Std = S.getStdNamespace();
913 if (!Std)
914 return DiagnoseMissing();
915
916 // Look up the trait itself, within namespace std. We can diagnose various
917 // problems with this lookup even if we've been asked to not diagnose a
918 // missing specialization, because this can only fail if the user has been
919 // declaring their own names in namespace std or we don't support the
920 // standard library implementation in use.
921 LookupResult Result(S, &S.PP.getIdentifierTable().get(Trait),
922 Loc, Sema::LookupOrdinaryName);
923 if (!S.LookupQualifiedName(Result, Std))
924 return DiagnoseMissing();
925 if (Result.isAmbiguous())
926 return true;
927
928 ClassTemplateDecl *TraitTD = Result.getAsSingle<ClassTemplateDecl>();
929 if (!TraitTD) {
930 Result.suppressDiagnostics();
931 NamedDecl *Found = *Result.begin();
932 S.Diag(Loc, diag::err_std_type_trait_not_class_template) << Trait;
933 S.Diag(Found->getLocation(), diag::note_declared_at);
934 return true;
935 }
936
937 // Build the template-id.
938 QualType TraitTy = S.CheckTemplateIdType(TemplateName(TraitTD), Loc, Args);
939 if (TraitTy.isNull())
940 return true;
941 if (!S.isCompleteType(Loc, TraitTy)) {
942 if (DiagID)
943 S.RequireCompleteType(
944 Loc, TraitTy, DiagID,
945 printTemplateArgs(S.Context.getPrintingPolicy(), Args));
946 return true;
947 }
948
949 CXXRecordDecl *RD = TraitTy->getAsCXXRecordDecl();
950 assert(RD && "specialization of class template is not a class?")((RD && "specialization of class template is not a class?"
) ? static_cast<void> (0) : __assert_fail ("RD && \"specialization of class template is not a class?\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 950, __PRETTY_FUNCTION__))
;
951
952 // Look up the member of the trait type.
953 S.LookupQualifiedName(TraitMemberLookup, RD);
954 return TraitMemberLookup.isAmbiguous();
955}
956
957static TemplateArgumentLoc
958getTrivialIntegralTemplateArgument(Sema &S, SourceLocation Loc, QualType T,
959 uint64_t I) {
960 TemplateArgument Arg(S.Context, S.Context.MakeIntValue(I, T), T);
961 return S.getTrivialTemplateArgumentLoc(Arg, T, Loc);
962}
963
964static TemplateArgumentLoc
965getTrivialTypeTemplateArgument(Sema &S, SourceLocation Loc, QualType T) {
966 return S.getTrivialTemplateArgumentLoc(TemplateArgument(T), QualType(), Loc);
967}
968
969namespace { enum class IsTupleLike { TupleLike, NotTupleLike, Error }; }
970
971static IsTupleLike isTupleLike(Sema &S, SourceLocation Loc, QualType T,
972 llvm::APSInt &Size) {
973 EnterExpressionEvaluationContext ContextRAII(S, Sema::ConstantEvaluated);
974
975 DeclarationName Value = S.PP.getIdentifierInfo("value");
976 LookupResult R(S, Value, Loc, Sema::LookupOrdinaryName);
977
978 // Form template argument list for tuple_size<T>.
979 TemplateArgumentListInfo Args(Loc, Loc);
980 Args.addArgument(getTrivialTypeTemplateArgument(S, Loc, T));
981
982 // If there's no tuple_size specialization, it's not tuple-like.
983 if (lookupStdTypeTraitMember(S, R, Loc, "tuple_size", Args, /*DiagID*/0))
984 return IsTupleLike::NotTupleLike;
985
986 // If we get this far, we've committed to the tuple interpretation, but
987 // we can still fail if there actually isn't a usable ::value.
988
989 struct ICEDiagnoser : Sema::VerifyICEDiagnoser {
990 LookupResult &R;
991 TemplateArgumentListInfo &Args;
992 ICEDiagnoser(LookupResult &R, TemplateArgumentListInfo &Args)
993 : R(R), Args(Args) {}
994 void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) {
995 S.Diag(Loc, diag::err_decomp_decl_std_tuple_size_not_constant)
996 << printTemplateArgs(S.Context.getPrintingPolicy(), Args);
997 }
998 } Diagnoser(R, Args);
999
1000 if (R.empty()) {
1001 Diagnoser.diagnoseNotICE(S, Loc, SourceRange());
1002 return IsTupleLike::Error;
1003 }
1004
1005 ExprResult E =
1006 S.BuildDeclarationNameExpr(CXXScopeSpec(), R, /*NeedsADL*/false);
1007 if (E.isInvalid())
1008 return IsTupleLike::Error;
1009
1010 E = S.VerifyIntegerConstantExpression(E.get(), &Size, Diagnoser, false);
1011 if (E.isInvalid())
1012 return IsTupleLike::Error;
1013
1014 return IsTupleLike::TupleLike;
1015}
1016
1017/// \return std::tuple_element<I, T>::type.
1018static QualType getTupleLikeElementType(Sema &S, SourceLocation Loc,
1019 unsigned I, QualType T) {
1020 // Form template argument list for tuple_element<I, T>.
1021 TemplateArgumentListInfo Args(Loc, Loc);
1022 Args.addArgument(
1023 getTrivialIntegralTemplateArgument(S, Loc, S.Context.getSizeType(), I));
1024 Args.addArgument(getTrivialTypeTemplateArgument(S, Loc, T));
1025
1026 DeclarationName TypeDN = S.PP.getIdentifierInfo("type");
1027 LookupResult R(S, TypeDN, Loc, Sema::LookupOrdinaryName);
1028 if (lookupStdTypeTraitMember(
1029 S, R, Loc, "tuple_element", Args,
1030 diag::err_decomp_decl_std_tuple_element_not_specialized))
1031 return QualType();
1032
1033 auto *TD = R.getAsSingle<TypeDecl>();
1034 if (!TD) {
1035 R.suppressDiagnostics();
1036 S.Diag(Loc, diag::err_decomp_decl_std_tuple_element_not_specialized)
1037 << printTemplateArgs(S.Context.getPrintingPolicy(), Args);
1038 if (!R.empty())
1039 S.Diag(R.getRepresentativeDecl()->getLocation(), diag::note_declared_at);
1040 return QualType();
1041 }
1042
1043 return S.Context.getTypeDeclType(TD);
1044}
1045
1046namespace {
1047struct BindingDiagnosticTrap {
1048 Sema &S;
1049 DiagnosticErrorTrap Trap;
1050 BindingDecl *BD;
1051
1052 BindingDiagnosticTrap(Sema &S, BindingDecl *BD)
1053 : S(S), Trap(S.Diags), BD(BD) {}
1054 ~BindingDiagnosticTrap() {
1055 if (Trap.hasErrorOccurred())
1056 S.Diag(BD->getLocation(), diag::note_in_binding_decl_init) << BD;
1057 }
1058};
1059}
1060
1061static bool checkTupleLikeDecomposition(Sema &S,
1062 ArrayRef<BindingDecl *> Bindings,
1063 VarDecl *Src, QualType DecompType,
1064 const llvm::APSInt &TupleSize) {
1065 if ((int64_t)Bindings.size() != TupleSize) {
1066 S.Diag(Src->getLocation(), diag::err_decomp_decl_wrong_number_bindings)
1067 << DecompType << (unsigned)Bindings.size() << TupleSize.toString(10)
1068 << (TupleSize < Bindings.size());
1069 return true;
1070 }
1071
1072 if (Bindings.empty())
1073 return false;
1074
1075 DeclarationName GetDN = S.PP.getIdentifierInfo("get");
1076
1077 // [dcl.decomp]p3:
1078 // The unqualified-id get is looked up in the scope of E by class member
1079 // access lookup
1080 LookupResult MemberGet(S, GetDN, Src->getLocation(), Sema::LookupMemberName);
1081 bool UseMemberGet = false;
1082 if (S.isCompleteType(Src->getLocation(), DecompType)) {
1083 if (auto *RD = DecompType->getAsCXXRecordDecl())
1084 S.LookupQualifiedName(MemberGet, RD);
1085 if (MemberGet.isAmbiguous())
1086 return true;
1087 UseMemberGet = !MemberGet.empty();
1088 S.FilterAcceptableTemplateNames(MemberGet);
1089 }
1090
1091 unsigned I = 0;
1092 for (auto *B : Bindings) {
1093 BindingDiagnosticTrap Trap(S, B);
1094 SourceLocation Loc = B->getLocation();
1095
1096 ExprResult E = S.BuildDeclRefExpr(Src, DecompType, VK_LValue, Loc);
1097 if (E.isInvalid())
1098 return true;
1099
1100 // e is an lvalue if the type of the entity is an lvalue reference and
1101 // an xvalue otherwise
1102 if (!Src->getType()->isLValueReferenceType())
1103 E = ImplicitCastExpr::Create(S.Context, E.get()->getType(), CK_NoOp,
1104 E.get(), nullptr, VK_XValue);
1105
1106 TemplateArgumentListInfo Args(Loc, Loc);
1107 Args.addArgument(
1108 getTrivialIntegralTemplateArgument(S, Loc, S.Context.getSizeType(), I));
1109
1110 if (UseMemberGet) {
1111 // if [lookup of member get] finds at least one declaration, the
1112 // initializer is e.get<i-1>().
1113 E = S.BuildMemberReferenceExpr(E.get(), DecompType, Loc, false,
1114 CXXScopeSpec(), SourceLocation(), nullptr,
1115 MemberGet, &Args, nullptr);
1116 if (E.isInvalid())
1117 return true;
1118
1119 E = S.ActOnCallExpr(nullptr, E.get(), Loc, None, Loc);
1120 } else {
1121 // Otherwise, the initializer is get<i-1>(e), where get is looked up
1122 // in the associated namespaces.
1123 Expr *Get = UnresolvedLookupExpr::Create(
1124 S.Context, nullptr, NestedNameSpecifierLoc(), SourceLocation(),
1125 DeclarationNameInfo(GetDN, Loc), /*RequiresADL*/true, &Args,
1126 UnresolvedSetIterator(), UnresolvedSetIterator());
1127
1128 Expr *Arg = E.get();
1129 E = S.ActOnCallExpr(nullptr, Get, Loc, Arg, Loc);
1130 }
1131 if (E.isInvalid())
1132 return true;
1133 Expr *Init = E.get();
1134
1135 // Given the type T designated by std::tuple_element<i - 1, E>::type,
1136 QualType T = getTupleLikeElementType(S, Loc, I, DecompType);
1137 if (T.isNull())
1138 return true;
1139
1140 // each vi is a variable of type "reference to T" initialized with the
1141 // initializer, where the reference is an lvalue reference if the
1142 // initializer is an lvalue and an rvalue reference otherwise
1143 QualType RefType =
1144 S.BuildReferenceType(T, E.get()->isLValue(), Loc, B->getDeclName());
1145 if (RefType.isNull())
1146 return true;
1147 auto *RefVD = VarDecl::Create(
1148 S.Context, Src->getDeclContext(), Loc, Loc,
1149 B->getDeclName().getAsIdentifierInfo(), RefType,
1150 S.Context.getTrivialTypeSourceInfo(T, Loc), Src->getStorageClass());
1151 RefVD->setLexicalDeclContext(Src->getLexicalDeclContext());
1152 RefVD->setTSCSpec(Src->getTSCSpec());
1153 RefVD->setImplicit();
1154 if (Src->isInlineSpecified())
1155 RefVD->setInlineSpecified();
1156 RefVD->getLexicalDeclContext()->addHiddenDecl(RefVD);
1157
1158 InitializedEntity Entity = InitializedEntity::InitializeBinding(RefVD);
1159 InitializationKind Kind = InitializationKind::CreateCopy(Loc, Loc);
1160 InitializationSequence Seq(S, Entity, Kind, Init);
1161 E = Seq.Perform(S, Entity, Kind, Init);
1162 if (E.isInvalid())
1163 return true;
1164 E = S.ActOnFinishFullExpr(E.get(), Loc);
1165 if (E.isInvalid())
1166 return true;
1167 RefVD->setInit(E.get());
1168 RefVD->checkInitIsICE();
1169
1170 E = S.BuildDeclarationNameExpr(CXXScopeSpec(),
1171 DeclarationNameInfo(B->getDeclName(), Loc),
1172 RefVD);
1173 if (E.isInvalid())
1174 return true;
1175
1176 B->setBinding(T, E.get());
1177 I++;
1178 }
1179
1180 return false;
1181}
1182
1183/// Find the base class to decompose in a built-in decomposition of a class type.
1184/// This base class search is, unfortunately, not quite like any other that we
1185/// perform anywhere else in C++.
1186static const CXXRecordDecl *findDecomposableBaseClass(Sema &S,
1187 SourceLocation Loc,
1188 const CXXRecordDecl *RD,
1189 CXXCastPath &BasePath) {
1190 auto BaseHasFields = [](const CXXBaseSpecifier *Specifier,
1191 CXXBasePath &Path) {
1192 return Specifier->getType()->getAsCXXRecordDecl()->hasDirectFields();
1193 };
1194
1195 const CXXRecordDecl *ClassWithFields = nullptr;
1196 if (RD->hasDirectFields())
1197 // [dcl.decomp]p4:
1198 // Otherwise, all of E's non-static data members shall be public direct
1199 // members of E ...
1200 ClassWithFields = RD;
1201 else {
1202 // ... or of ...
1203 CXXBasePaths Paths;
1204 Paths.setOrigin(const_cast<CXXRecordDecl*>(RD));
1205 if (!RD->lookupInBases(BaseHasFields, Paths)) {
1206 // If no classes have fields, just decompose RD itself. (This will work
1207 // if and only if zero bindings were provided.)
1208 return RD;
1209 }
1210
1211 CXXBasePath *BestPath = nullptr;
1212 for (auto &P : Paths) {
1213 if (!BestPath)
1214 BestPath = &P;
1215 else if (!S.Context.hasSameType(P.back().Base->getType(),
1216 BestPath->back().Base->getType())) {
1217 // ... the same ...
1218 S.Diag(Loc, diag::err_decomp_decl_multiple_bases_with_members)
1219 << false << RD << BestPath->back().Base->getType()
1220 << P.back().Base->getType();
1221 return nullptr;
1222 } else if (P.Access < BestPath->Access) {
1223 BestPath = &P;
1224 }
1225 }
1226
1227 // ... unambiguous ...
1228 QualType BaseType = BestPath->back().Base->getType();
1229 if (Paths.isAmbiguous(S.Context.getCanonicalType(BaseType))) {
1230 S.Diag(Loc, diag::err_decomp_decl_ambiguous_base)
1231 << RD << BaseType << S.getAmbiguousPathsDisplayString(Paths);
1232 return nullptr;
1233 }
1234
1235 // ... public base class of E.
1236 if (BestPath->Access != AS_public) {
1237 S.Diag(Loc, diag::err_decomp_decl_non_public_base)
1238 << RD << BaseType;
1239 for (auto &BS : *BestPath) {
1240 if (BS.Base->getAccessSpecifier() != AS_public) {
1241 S.Diag(BS.Base->getLocStart(), diag::note_access_constrained_by_path)
1242 << (BS.Base->getAccessSpecifier() == AS_protected)
1243 << (BS.Base->getAccessSpecifierAsWritten() == AS_none);
1244 break;
1245 }
1246 }
1247 return nullptr;
1248 }
1249
1250 ClassWithFields = BaseType->getAsCXXRecordDecl();
1251 S.BuildBasePathArray(Paths, BasePath);
1252 }
1253
1254 // The above search did not check whether the selected class itself has base
1255 // classes with fields, so check that now.
1256 CXXBasePaths Paths;
1257 if (ClassWithFields->lookupInBases(BaseHasFields, Paths)) {
1258 S.Diag(Loc, diag::err_decomp_decl_multiple_bases_with_members)
1259 << (ClassWithFields == RD) << RD << ClassWithFields
1260 << Paths.front().back().Base->getType();
1261 return nullptr;
1262 }
1263
1264 return ClassWithFields;
1265}
1266
1267static bool checkMemberDecomposition(Sema &S, ArrayRef<BindingDecl*> Bindings,
1268 ValueDecl *Src, QualType DecompType,
1269 const CXXRecordDecl *RD) {
1270 CXXCastPath BasePath;
1271 RD = findDecomposableBaseClass(S, Src->getLocation(), RD, BasePath);
1272 if (!RD)
1273 return true;
1274 QualType BaseType = S.Context.getQualifiedType(S.Context.getRecordType(RD),
1275 DecompType.getQualifiers());
1276
1277 auto DiagnoseBadNumberOfBindings = [&]() -> bool {
1278 unsigned NumFields =
1279 std::count_if(RD->field_begin(), RD->field_end(),
1280 [](FieldDecl *FD) { return !FD->isUnnamedBitfield(); });
1281 assert(Bindings.size() != NumFields)((Bindings.size() != NumFields) ? static_cast<void> (0)
: __assert_fail ("Bindings.size() != NumFields", "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 1281, __PRETTY_FUNCTION__))
;
1282 S.Diag(Src->getLocation(), diag::err_decomp_decl_wrong_number_bindings)
1283 << DecompType << (unsigned)Bindings.size() << NumFields
1284 << (NumFields < Bindings.size());
1285 return true;
1286 };
1287
1288 // all of E's non-static data members shall be public [...] members,
1289 // E shall not have an anonymous union member, ...
1290 unsigned I = 0;
1291 for (auto *FD : RD->fields()) {
1292 if (FD->isUnnamedBitfield())
1293 continue;
1294
1295 if (FD->isAnonymousStructOrUnion()) {
1296 S.Diag(Src->getLocation(), diag::err_decomp_decl_anon_union_member)
1297 << DecompType << FD->getType()->isUnionType();
1298 S.Diag(FD->getLocation(), diag::note_declared_at);
1299 return true;
1300 }
1301
1302 // We have a real field to bind.
1303 if (I >= Bindings.size())
1304 return DiagnoseBadNumberOfBindings();
1305 auto *B = Bindings[I++];
1306
1307 SourceLocation Loc = B->getLocation();
1308 if (FD->getAccess() != AS_public) {
1309 S.Diag(Loc, diag::err_decomp_decl_non_public_member) << FD << DecompType;
1310
1311 // Determine whether the access specifier was explicit.
1312 bool Implicit = true;
1313 for (const auto *D : RD->decls()) {
1314 if (declaresSameEntity(D, FD))
1315 break;
1316 if (isa<AccessSpecDecl>(D)) {
1317 Implicit = false;
1318 break;
1319 }
1320 }
1321
1322 S.Diag(FD->getLocation(), diag::note_access_natural)
1323 << (FD->getAccess() == AS_protected) << Implicit;
1324 return true;
1325 }
1326
1327 // Initialize the binding to Src.FD.
1328 ExprResult E = S.BuildDeclRefExpr(Src, DecompType, VK_LValue, Loc);
1329 if (E.isInvalid())
1330 return true;
1331 E = S.ImpCastExprToType(E.get(), BaseType, CK_UncheckedDerivedToBase,
1332 VK_LValue, &BasePath);
1333 if (E.isInvalid())
1334 return true;
1335 E = S.BuildFieldReferenceExpr(E.get(), /*IsArrow*/ false, Loc,
1336 CXXScopeSpec(), FD,
1337 DeclAccessPair::make(FD, FD->getAccess()),
1338 DeclarationNameInfo(FD->getDeclName(), Loc));
1339 if (E.isInvalid())
1340 return true;
1341
1342 // If the type of the member is T, the referenced type is cv T, where cv is
1343 // the cv-qualification of the decomposition expression.
1344 //
1345 // FIXME: We resolve a defect here: if the field is mutable, we do not add
1346 // 'const' to the type of the field.
1347 Qualifiers Q = DecompType.getQualifiers();
1348 if (FD->isMutable())
1349 Q.removeConst();
1350 B->setBinding(S.BuildQualifiedType(FD->getType(), Loc, Q), E.get());
1351 }
1352
1353 if (I != Bindings.size())
1354 return DiagnoseBadNumberOfBindings();
1355
1356 return false;
1357}
1358
1359void Sema::CheckCompleteDecompositionDeclaration(DecompositionDecl *DD) {
1360 QualType DecompType = DD->getType();
1361
1362 // If the type of the decomposition is dependent, then so is the type of
1363 // each binding.
1364 if (DecompType->isDependentType()) {
1365 for (auto *B : DD->bindings())
1366 B->setType(Context.DependentTy);
1367 return;
1368 }
1369
1370 DecompType = DecompType.getNonReferenceType();
1371 ArrayRef<BindingDecl*> Bindings = DD->bindings();
1372
1373 // C++1z [dcl.decomp]/2:
1374 // If E is an array type [...]
1375 // As an extension, we also support decomposition of built-in complex and
1376 // vector types.
1377 if (auto *CAT = Context.getAsConstantArrayType(DecompType)) {
1378 if (checkArrayDecomposition(*this, Bindings, DD, DecompType, CAT))
1379 DD->setInvalidDecl();
1380 return;
1381 }
1382 if (auto *VT = DecompType->getAs<VectorType>()) {
1383 if (checkVectorDecomposition(*this, Bindings, DD, DecompType, VT))
1384 DD->setInvalidDecl();
1385 return;
1386 }
1387 if (auto *CT = DecompType->getAs<ComplexType>()) {
1388 if (checkComplexDecomposition(*this, Bindings, DD, DecompType, CT))
1389 DD->setInvalidDecl();
1390 return;
1391 }
1392
1393 // C++1z [dcl.decomp]/3:
1394 // if the expression std::tuple_size<E>::value is a well-formed integral
1395 // constant expression, [...]
1396 llvm::APSInt TupleSize(32);
1397 switch (isTupleLike(*this, DD->getLocation(), DecompType, TupleSize)) {
1398 case IsTupleLike::Error:
1399 DD->setInvalidDecl();
1400 return;
1401
1402 case IsTupleLike::TupleLike:
1403 if (checkTupleLikeDecomposition(*this, Bindings, DD, DecompType, TupleSize))
1404 DD->setInvalidDecl();
1405 return;
1406
1407 case IsTupleLike::NotTupleLike:
1408 break;
1409 }
1410
1411 // C++1z [dcl.dcl]/8:
1412 // [E shall be of array or non-union class type]
1413 CXXRecordDecl *RD = DecompType->getAsCXXRecordDecl();
1414 if (!RD || RD->isUnion()) {
1415 Diag(DD->getLocation(), diag::err_decomp_decl_unbindable_type)
1416 << DD << !RD << DecompType;
1417 DD->setInvalidDecl();
1418 return;
1419 }
1420
1421 // C++1z [dcl.decomp]/4:
1422 // all of E's non-static data members shall be [...] direct members of
1423 // E or of the same unambiguous public base class of E, ...
1424 if (checkMemberDecomposition(*this, Bindings, DD, DecompType, RD))
1425 DD->setInvalidDecl();
1426}
1427
1428/// \brief Merge the exception specifications of two variable declarations.
1429///
1430/// This is called when there's a redeclaration of a VarDecl. The function
1431/// checks if the redeclaration might have an exception specification and
1432/// validates compatibility and merges the specs if necessary.
1433void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) {
1434 // Shortcut if exceptions are disabled.
1435 if (!getLangOpts().CXXExceptions)
1436 return;
1437
1438 assert(Context.hasSameType(New->getType(), Old->getType()) &&((Context.hasSameType(New->getType(), Old->getType()) &&
"Should only be called if types are otherwise the same.") ? static_cast
<void> (0) : __assert_fail ("Context.hasSameType(New->getType(), Old->getType()) && \"Should only be called if types are otherwise the same.\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 1439, __PRETTY_FUNCTION__))
1439 "Should only be called if types are otherwise the same.")((Context.hasSameType(New->getType(), Old->getType()) &&
"Should only be called if types are otherwise the same.") ? static_cast
<void> (0) : __assert_fail ("Context.hasSameType(New->getType(), Old->getType()) && \"Should only be called if types are otherwise the same.\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 1439, __PRETTY_FUNCTION__))
;
1440
1441 QualType NewType = New->getType();
1442 QualType OldType = Old->getType();
1443
1444 // We're only interested in pointers and references to functions, as well
1445 // as pointers to member functions.
1446 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) {
1447 NewType = R->getPointeeType();
1448 OldType = OldType->getAs<ReferenceType>()->getPointeeType();
1449 } else if (const PointerType *P = NewType->getAs<PointerType>()) {
1450 NewType = P->getPointeeType();
1451 OldType = OldType->getAs<PointerType>()->getPointeeType();
1452 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) {
1453 NewType = M->getPointeeType();
1454 OldType = OldType->getAs<MemberPointerType>()->getPointeeType();
1455 }
1456
1457 if (!NewType->isFunctionProtoType())
1458 return;
1459
1460 // There's lots of special cases for functions. For function pointers, system
1461 // libraries are hopefully not as broken so that we don't need these
1462 // workarounds.
1463 if (CheckEquivalentExceptionSpec(
1464 OldType->getAs<FunctionProtoType>(), Old->getLocation(),
1465 NewType->getAs<FunctionProtoType>(), New->getLocation())) {
1466 New->setInvalidDecl();
1467 }
1468}
1469
1470/// CheckCXXDefaultArguments - Verify that the default arguments for a
1471/// function declaration are well-formed according to C++
1472/// [dcl.fct.default].
1473void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) {
1474 unsigned NumParams = FD->getNumParams();
1475 unsigned p;
1476
1477 // Find first parameter with a default argument
1478 for (p = 0; p < NumParams; ++p) {
1479 ParmVarDecl *Param = FD->getParamDecl(p);
1480 if (Param->hasDefaultArg())
1481 break;
1482 }
1483
1484 // C++11 [dcl.fct.default]p4:
1485 // In a given function declaration, each parameter subsequent to a parameter
1486 // with a default argument shall have a default argument supplied in this or
1487 // a previous declaration or shall be a function parameter pack. A default
1488 // argument shall not be redefined by a later declaration (not even to the
1489 // same value).
1490 unsigned LastMissingDefaultArg = 0;
1491 for (; p < NumParams; ++p) {
1492 ParmVarDecl *Param = FD->getParamDecl(p);
1493 if (!Param->hasDefaultArg() && !Param->isParameterPack()) {
1494 if (Param->isInvalidDecl())
1495 /* We already complained about this parameter. */;
1496 else if (Param->getIdentifier())
1497 Diag(Param->getLocation(),
1498 diag::err_param_default_argument_missing_name)
1499 << Param->getIdentifier();
1500 else
1501 Diag(Param->getLocation(),
1502 diag::err_param_default_argument_missing);
1503
1504 LastMissingDefaultArg = p;
1505 }
1506 }
1507
1508 if (LastMissingDefaultArg > 0) {
1509 // Some default arguments were missing. Clear out all of the
1510 // default arguments up to (and including) the last missing
1511 // default argument, so that we leave the function parameters
1512 // in a semantically valid state.
1513 for (p = 0; p <= LastMissingDefaultArg; ++p) {
1514 ParmVarDecl *Param = FD->getParamDecl(p);
1515 if (Param->hasDefaultArg()) {
1516 Param->setDefaultArg(nullptr);
1517 }
1518 }
1519 }
1520}
1521
1522// CheckConstexprParameterTypes - Check whether a function's parameter types
1523// are all literal types. If so, return true. If not, produce a suitable
1524// diagnostic and return false.
1525static bool CheckConstexprParameterTypes(Sema &SemaRef,
1526 const FunctionDecl *FD) {
1527 unsigned ArgIndex = 0;
1528 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>();
1529 for (FunctionProtoType::param_type_iterator i = FT->param_type_begin(),
1530 e = FT->param_type_end();
1531 i != e; ++i, ++ArgIndex) {
1532 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex);
1533 SourceLocation ParamLoc = PD->getLocation();
1534 if (!(*i)->isDependentType() &&
1535 SemaRef.RequireLiteralType(ParamLoc, *i,
1536 diag::err_constexpr_non_literal_param,
1537 ArgIndex+1, PD->getSourceRange(),
1538 isa<CXXConstructorDecl>(FD)))
1539 return false;
1540 }
1541 return true;
1542}
1543
1544/// \brief Get diagnostic %select index for tag kind for
1545/// record diagnostic message.
1546/// WARNING: Indexes apply to particular diagnostics only!
1547///
1548/// \returns diagnostic %select index.
1549static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) {
1550 switch (Tag) {
1551 case TTK_Struct: return 0;
1552 case TTK_Interface: return 1;
1553 case TTK_Class: return 2;
1554 default: llvm_unreachable("Invalid tag kind for record diagnostic!")::llvm::llvm_unreachable_internal("Invalid tag kind for record diagnostic!"
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 1554)
;
1555 }
1556}
1557
1558// CheckConstexprFunctionDecl - Check whether a function declaration satisfies
1559// the requirements of a constexpr function definition or a constexpr
1560// constructor definition. If so, return true. If not, produce appropriate
1561// diagnostics and return false.
1562//
1563// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360.
1564bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) {
1565 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD);
1566 if (MD && MD->isInstance()) {
1567 // C++11 [dcl.constexpr]p4:
1568 // The definition of a constexpr constructor shall satisfy the following
1569 // constraints:
1570 // - the class shall not have any virtual base classes;
1571 const CXXRecordDecl *RD = MD->getParent();
1572 if (RD->getNumVBases()) {
1573 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base)
1574 << isa<CXXConstructorDecl>(NewFD)
1575 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases();
1576 for (const auto &I : RD->vbases())
1577 Diag(I.getLocStart(),
1578 diag::note_constexpr_virtual_base_here) << I.getSourceRange();
1579 return false;
1580 }
1581 }
1582
1583 if (!isa<CXXConstructorDecl>(NewFD)) {
1584 // C++11 [dcl.constexpr]p3:
1585 // The definition of a constexpr function shall satisfy the following
1586 // constraints:
1587 // - it shall not be virtual;
1588 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD);
1589 if (Method && Method->isVirtual()) {
1590 Method = Method->getCanonicalDecl();
1591 Diag(Method->getLocation(), diag::err_constexpr_virtual);
1592
1593 // If it's not obvious why this function is virtual, find an overridden
1594 // function which uses the 'virtual' keyword.
1595 const CXXMethodDecl *WrittenVirtual = Method;
1596 while (!WrittenVirtual->isVirtualAsWritten())
1597 WrittenVirtual = *WrittenVirtual->begin_overridden_methods();
1598 if (WrittenVirtual != Method)
1599 Diag(WrittenVirtual->getLocation(),
1600 diag::note_overridden_virtual_function);
1601 return false;
1602 }
1603
1604 // - its return type shall be a literal type;
1605 QualType RT = NewFD->getReturnType();
1606 if (!RT->isDependentType() &&
1607 RequireLiteralType(NewFD->getLocation(), RT,
1608 diag::err_constexpr_non_literal_return))
1609 return false;
1610 }
1611
1612 // - each of its parameter types shall be a literal type;
1613 if (!CheckConstexprParameterTypes(*this, NewFD))
1614 return false;
1615
1616 return true;
1617}
1618
1619/// Check the given declaration statement is legal within a constexpr function
1620/// body. C++11 [dcl.constexpr]p3,p4, and C++1y [dcl.constexpr]p3.
1621///
1622/// \return true if the body is OK (maybe only as an extension), false if we
1623/// have diagnosed a problem.
1624static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl,
1625 DeclStmt *DS, SourceLocation &Cxx1yLoc) {
1626 // C++11 [dcl.constexpr]p3 and p4:
1627 // The definition of a constexpr function(p3) or constructor(p4) [...] shall
1628 // contain only
1629 for (const auto *DclIt : DS->decls()) {
1630 switch (DclIt->getKind()) {
1631 case Decl::StaticAssert:
1632 case Decl::Using:
1633 case Decl::UsingShadow:
1634 case Decl::UsingDirective:
1635 case Decl::UnresolvedUsingTypename:
1636 case Decl::UnresolvedUsingValue:
1637 // - static_assert-declarations
1638 // - using-declarations,
1639 // - using-directives,
1640 continue;
1641
1642 case Decl::Typedef:
1643 case Decl::TypeAlias: {
1644 // - typedef declarations and alias-declarations that do not define
1645 // classes or enumerations,
1646 const auto *TN = cast<TypedefNameDecl>(DclIt);
1647 if (TN->getUnderlyingType()->isVariablyModifiedType()) {
1648 // Don't allow variably-modified types in constexpr functions.
1649 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc();
1650 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla)
1651 << TL.getSourceRange() << TL.getType()
1652 << isa<CXXConstructorDecl>(Dcl);
1653 return false;
1654 }
1655 continue;
1656 }
1657
1658 case Decl::Enum:
1659 case Decl::CXXRecord:
1660 // C++1y allows types to be defined, not just declared.
1661 if (cast<TagDecl>(DclIt)->isThisDeclarationADefinition())
1662 SemaRef.Diag(DS->getLocStart(),
1663 SemaRef.getLangOpts().CPlusPlus14
1664 ? diag::warn_cxx11_compat_constexpr_type_definition
1665 : diag::ext_constexpr_type_definition)
1666 << isa<CXXConstructorDecl>(Dcl);
1667 continue;
1668
1669 case Decl::EnumConstant:
1670 case Decl::IndirectField:
1671 case Decl::ParmVar:
1672 // These can only appear with other declarations which are banned in
1673 // C++11 and permitted in C++1y, so ignore them.
1674 continue;
1675
1676 case Decl::Var:
1677 case Decl::Decomposition: {
1678 // C++1y [dcl.constexpr]p3 allows anything except:
1679 // a definition of a variable of non-literal type or of static or
1680 // thread storage duration or for which no initialization is performed.
1681 const auto *VD = cast<VarDecl>(DclIt);
1682 if (VD->isThisDeclarationADefinition()) {
1683 if (VD->isStaticLocal()) {
1684 SemaRef.Diag(VD->getLocation(),
1685 diag::err_constexpr_local_var_static)
1686 << isa<CXXConstructorDecl>(Dcl)
1687 << (VD->getTLSKind() == VarDecl::TLS_Dynamic);
1688 return false;
1689 }
1690 if (!VD->getType()->isDependentType() &&
1691 SemaRef.RequireLiteralType(
1692 VD->getLocation(), VD->getType(),
1693 diag::err_constexpr_local_var_non_literal_type,
1694 isa<CXXConstructorDecl>(Dcl)))
1695 return false;
1696 if (!VD->getType()->isDependentType() &&
1697 !VD->hasInit() && !VD->isCXXForRangeDecl()) {
1698 SemaRef.Diag(VD->getLocation(),
1699 diag::err_constexpr_local_var_no_init)
1700 << isa<CXXConstructorDecl>(Dcl);
1701 return false;
1702 }
1703 }
1704 SemaRef.Diag(VD->getLocation(),
1705 SemaRef.getLangOpts().CPlusPlus14
1706 ? diag::warn_cxx11_compat_constexpr_local_var
1707 : diag::ext_constexpr_local_var)
1708 << isa<CXXConstructorDecl>(Dcl);
1709 continue;
1710 }
1711
1712 case Decl::NamespaceAlias:
1713 case Decl::Function:
1714 // These are disallowed in C++11 and permitted in C++1y. Allow them
1715 // everywhere as an extension.
1716 if (!Cxx1yLoc.isValid())
1717 Cxx1yLoc = DS->getLocStart();
1718 continue;
1719
1720 default:
1721 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt)
1722 << isa<CXXConstructorDecl>(Dcl);
1723 return false;
1724 }
1725 }
1726
1727 return true;
1728}
1729
1730/// Check that the given field is initialized within a constexpr constructor.
1731///
1732/// \param Dcl The constexpr constructor being checked.
1733/// \param Field The field being checked. This may be a member of an anonymous
1734/// struct or union nested within the class being checked.
1735/// \param Inits All declarations, including anonymous struct/union members and
1736/// indirect members, for which any initialization was provided.
1737/// \param Diagnosed Set to true if an error is produced.
1738static void CheckConstexprCtorInitializer(Sema &SemaRef,
1739 const FunctionDecl *Dcl,
1740 FieldDecl *Field,
1741 llvm::SmallSet<Decl*, 16> &Inits,
1742 bool &Diagnosed) {
1743 if (Field->isInvalidDecl())
1744 return;
1745
1746 if (Field->isUnnamedBitfield())
1747 return;
1748
1749 // Anonymous unions with no variant members and empty anonymous structs do not
1750 // need to be explicitly initialized. FIXME: Anonymous structs that contain no
1751 // indirect fields don't need initializing.
1752 if (Field->isAnonymousStructOrUnion() &&
1753 (Field->getType()->isUnionType()
1754 ? !Field->getType()->getAsCXXRecordDecl()->hasVariantMembers()
1755 : Field->getType()->getAsCXXRecordDecl()->isEmpty()))
1756 return;
1757
1758 if (!Inits.count(Field)) {
1759 if (!Diagnosed) {
1760 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init);
1761 Diagnosed = true;
1762 }
1763 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init);
1764 } else if (Field->isAnonymousStructOrUnion()) {
1765 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl();
1766 for (auto *I : RD->fields())
1767 // If an anonymous union contains an anonymous struct of which any member
1768 // is initialized, all members must be initialized.
1769 if (!RD->isUnion() || Inits.count(I))
1770 CheckConstexprCtorInitializer(SemaRef, Dcl, I, Inits, Diagnosed);
1771 }
1772}
1773
1774/// Check the provided statement is allowed in a constexpr function
1775/// definition.
1776static bool
1777CheckConstexprFunctionStmt(Sema &SemaRef, const FunctionDecl *Dcl, Stmt *S,
1778 SmallVectorImpl<SourceLocation> &ReturnStmts,
1779 SourceLocation &Cxx1yLoc) {
1780 // - its function-body shall be [...] a compound-statement that contains only
1781 switch (S->getStmtClass()) {
1782 case Stmt::NullStmtClass:
1783 // - null statements,
1784 return true;
1785
1786 case Stmt::DeclStmtClass:
1787 // - static_assert-declarations
1788 // - using-declarations,
1789 // - using-directives,
1790 // - typedef declarations and alias-declarations that do not define
1791 // classes or enumerations,
1792 if (!CheckConstexprDeclStmt(SemaRef, Dcl, cast<DeclStmt>(S), Cxx1yLoc))
1793 return false;
1794 return true;
1795
1796 case Stmt::ReturnStmtClass:
1797 // - and exactly one return statement;
1798 if (isa<CXXConstructorDecl>(Dcl)) {
1799 // C++1y allows return statements in constexpr constructors.
1800 if (!Cxx1yLoc.isValid())
1801 Cxx1yLoc = S->getLocStart();
1802 return true;
1803 }
1804
1805 ReturnStmts.push_back(S->getLocStart());
1806 return true;
1807
1808 case Stmt::CompoundStmtClass: {
1809 // C++1y allows compound-statements.
1810 if (!Cxx1yLoc.isValid())
1811 Cxx1yLoc = S->getLocStart();
1812
1813 CompoundStmt *CompStmt = cast<CompoundStmt>(S);
1814 for (auto *BodyIt : CompStmt->body()) {
1815 if (!CheckConstexprFunctionStmt(SemaRef, Dcl, BodyIt, ReturnStmts,
1816 Cxx1yLoc))
1817 return false;
1818 }
1819 return true;
1820 }
1821
1822 case Stmt::AttributedStmtClass:
1823 if (!Cxx1yLoc.isValid())
1824 Cxx1yLoc = S->getLocStart();
1825 return true;
1826
1827 case Stmt::IfStmtClass: {
1828 // C++1y allows if-statements.
1829 if (!Cxx1yLoc.isValid())
1830 Cxx1yLoc = S->getLocStart();
1831
1832 IfStmt *If = cast<IfStmt>(S);
1833 if (!CheckConstexprFunctionStmt(SemaRef, Dcl, If->getThen(), ReturnStmts,
1834 Cxx1yLoc))
1835 return false;
1836 if (If->getElse() &&
1837 !CheckConstexprFunctionStmt(SemaRef, Dcl, If->getElse(), ReturnStmts,
1838 Cxx1yLoc))
1839 return false;
1840 return true;
1841 }
1842
1843 case Stmt::WhileStmtClass:
1844 case Stmt::DoStmtClass:
1845 case Stmt::ForStmtClass:
1846 case Stmt::CXXForRangeStmtClass:
1847 case Stmt::ContinueStmtClass:
1848 // C++1y allows all of these. We don't allow them as extensions in C++11,
1849 // because they don't make sense without variable mutation.
1850 if (!SemaRef.getLangOpts().CPlusPlus14)
1851 break;
1852 if (!Cxx1yLoc.isValid())
1853 Cxx1yLoc = S->getLocStart();
1854 for (Stmt *SubStmt : S->children())
1855 if (SubStmt &&
1856 !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts,
1857 Cxx1yLoc))
1858 return false;
1859 return true;
1860
1861 case Stmt::SwitchStmtClass:
1862 case Stmt::CaseStmtClass:
1863 case Stmt::DefaultStmtClass:
1864 case Stmt::BreakStmtClass:
1865 // C++1y allows switch-statements, and since they don't need variable
1866 // mutation, we can reasonably allow them in C++11 as an extension.
1867 if (!Cxx1yLoc.isValid())
1868 Cxx1yLoc = S->getLocStart();
1869 for (Stmt *SubStmt : S->children())
1870 if (SubStmt &&
1871 !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts,
1872 Cxx1yLoc))
1873 return false;
1874 return true;
1875
1876 default:
1877 if (!isa<Expr>(S))
1878 break;
1879
1880 // C++1y allows expression-statements.
1881 if (!Cxx1yLoc.isValid())
1882 Cxx1yLoc = S->getLocStart();
1883 return true;
1884 }
1885
1886 SemaRef.Diag(S->getLocStart(), diag::err_constexpr_body_invalid_stmt)
1887 << isa<CXXConstructorDecl>(Dcl);
1888 return false;
1889}
1890
1891/// Check the body for the given constexpr function declaration only contains
1892/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4.
1893///
1894/// \return true if the body is OK, false if we have diagnosed a problem.
1895bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) {
1896 if (isa<CXXTryStmt>(Body)) {
1897 // C++11 [dcl.constexpr]p3:
1898 // The definition of a constexpr function shall satisfy the following
1899 // constraints: [...]
1900 // - its function-body shall be = delete, = default, or a
1901 // compound-statement
1902 //
1903 // C++11 [dcl.constexpr]p4:
1904 // In the definition of a constexpr constructor, [...]
1905 // - its function-body shall not be a function-try-block;
1906 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block)
1907 << isa<CXXConstructorDecl>(Dcl);
1908 return false;
1909 }
1910
1911 SmallVector<SourceLocation, 4> ReturnStmts;
1912
1913 // - its function-body shall be [...] a compound-statement that contains only
1914 // [... list of cases ...]
1915 CompoundStmt *CompBody = cast<CompoundStmt>(Body);
1916 SourceLocation Cxx1yLoc;
1917 for (auto *BodyIt : CompBody->body()) {
1918 if (!CheckConstexprFunctionStmt(*this, Dcl, BodyIt, ReturnStmts, Cxx1yLoc))
1919 return false;
1920 }
1921
1922 if (Cxx1yLoc.isValid())
1923 Diag(Cxx1yLoc,
1924 getLangOpts().CPlusPlus14
1925 ? diag::warn_cxx11_compat_constexpr_body_invalid_stmt
1926 : diag::ext_constexpr_body_invalid_stmt)
1927 << isa<CXXConstructorDecl>(Dcl);
1928
1929 if (const CXXConstructorDecl *Constructor
1930 = dyn_cast<CXXConstructorDecl>(Dcl)) {
1931 const CXXRecordDecl *RD = Constructor->getParent();
1932 // DR1359:
1933 // - every non-variant non-static data member and base class sub-object
1934 // shall be initialized;
1935 // DR1460:
1936 // - if the class is a union having variant members, exactly one of them
1937 // shall be initialized;
1938 if (RD->isUnion()) {
1939 if (Constructor->getNumCtorInitializers() == 0 &&
1940 RD->hasVariantMembers()) {
1941 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init);
1942 return false;
1943 }
1944 } else if (!Constructor->isDependentContext() &&
1945 !Constructor->isDelegatingConstructor()) {
1946 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases")((RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"
) ? static_cast<void> (0) : __assert_fail ("RD->getNumVBases() == 0 && \"constexpr ctor with virtual bases\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 1946, __PRETTY_FUNCTION__))
;
1947
1948 // Skip detailed checking if we have enough initializers, and we would
1949 // allow at most one initializer per member.
1950 bool AnyAnonStructUnionMembers = false;
1951 unsigned Fields = 0;
1952 for (CXXRecordDecl::field_iterator I = RD->field_begin(),
1953 E = RD->field_end(); I != E; ++I, ++Fields) {
1954 if (I->isAnonymousStructOrUnion()) {
1955 AnyAnonStructUnionMembers = true;
1956 break;
1957 }
1958 }
1959 // DR1460:
1960 // - if the class is a union-like class, but is not a union, for each of
1961 // its anonymous union members having variant members, exactly one of
1962 // them shall be initialized;
1963 if (AnyAnonStructUnionMembers ||
1964 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) {
1965 // Check initialization of non-static data members. Base classes are
1966 // always initialized so do not need to be checked. Dependent bases
1967 // might not have initializers in the member initializer list.
1968 llvm::SmallSet<Decl*, 16> Inits;
1969 for (const auto *I: Constructor->inits()) {
1970 if (FieldDecl *FD = I->getMember())
1971 Inits.insert(FD);
1972 else if (IndirectFieldDecl *ID = I->getIndirectMember())
1973 Inits.insert(ID->chain_begin(), ID->chain_end());
1974 }
1975
1976 bool Diagnosed = false;
1977 for (auto *I : RD->fields())
1978 CheckConstexprCtorInitializer(*this, Dcl, I, Inits, Diagnosed);
1979 if (Diagnosed)
1980 return false;
1981 }
1982 }
1983 } else {
1984 if (ReturnStmts.empty()) {
1985 // C++1y doesn't require constexpr functions to contain a 'return'
1986 // statement. We still do, unless the return type might be void, because
1987 // otherwise if there's no return statement, the function cannot
1988 // be used in a core constant expression.
1989 bool OK = getLangOpts().CPlusPlus14 &&
1990 (Dcl->getReturnType()->isVoidType() ||
1991 Dcl->getReturnType()->isDependentType());
1992 Diag(Dcl->getLocation(),
1993 OK ? diag::warn_cxx11_compat_constexpr_body_no_return
1994 : diag::err_constexpr_body_no_return);
1995 if (!OK)
1996 return false;
1997 } else if (ReturnStmts.size() > 1) {
1998 Diag(ReturnStmts.back(),
1999 getLangOpts().CPlusPlus14
2000 ? diag::warn_cxx11_compat_constexpr_body_multiple_return
2001 : diag::ext_constexpr_body_multiple_return);
2002 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I)
2003 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return);
2004 }
2005 }
2006
2007 // C++11 [dcl.constexpr]p5:
2008 // if no function argument values exist such that the function invocation
2009 // substitution would produce a constant expression, the program is
2010 // ill-formed; no diagnostic required.
2011 // C++11 [dcl.constexpr]p3:
2012 // - every constructor call and implicit conversion used in initializing the
2013 // return value shall be one of those allowed in a constant expression.
2014 // C++11 [dcl.constexpr]p4:
2015 // - every constructor involved in initializing non-static data members and
2016 // base class sub-objects shall be a constexpr constructor.
2017 SmallVector<PartialDiagnosticAt, 8> Diags;
2018 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) {
2019 Diag(Dcl->getLocation(), diag::ext_constexpr_function_never_constant_expr)
2020 << isa<CXXConstructorDecl>(Dcl);
2021 for (size_t I = 0, N = Diags.size(); I != N; ++I)
2022 Diag(Diags[I].first, Diags[I].second);
2023 // Don't return false here: we allow this for compatibility in
2024 // system headers.
2025 }
2026
2027 return true;
2028}
2029
2030/// isCurrentClassName - Determine whether the identifier II is the
2031/// name of the class type currently being defined. In the case of
2032/// nested classes, this will only return true if II is the name of
2033/// the innermost class.
2034bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *,
2035 const CXXScopeSpec *SS) {
2036 assert(getLangOpts().CPlusPlus && "No class names in C!")((getLangOpts().CPlusPlus && "No class names in C!") ?
static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus && \"No class names in C!\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2036, __PRETTY_FUNCTION__))
;
2037
2038 CXXRecordDecl *CurDecl;
2039 if (SS && SS->isSet() && !SS->isInvalid()) {
2040 DeclContext *DC = computeDeclContext(*SS, true);
2041 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC);
2042 } else
2043 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext);
2044
2045 if (CurDecl && CurDecl->getIdentifier())
2046 return &II == CurDecl->getIdentifier();
2047 return false;
2048}
2049
2050/// \brief Determine whether the identifier II is a typo for the name of
2051/// the class type currently being defined. If so, update it to the identifier
2052/// that should have been used.
2053bool Sema::isCurrentClassNameTypo(IdentifierInfo *&II, const CXXScopeSpec *SS) {
2054 assert(getLangOpts().CPlusPlus && "No class names in C!")((getLangOpts().CPlusPlus && "No class names in C!") ?
static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus && \"No class names in C!\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2054, __PRETTY_FUNCTION__))
;
2055
2056 if (!getLangOpts().SpellChecking)
2057 return false;
2058
2059 CXXRecordDecl *CurDecl;
2060 if (SS && SS->isSet() && !SS->isInvalid()) {
2061 DeclContext *DC = computeDeclContext(*SS, true);
2062 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC);
2063 } else
2064 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext);
2065
2066 if (CurDecl && CurDecl->getIdentifier() && II != CurDecl->getIdentifier() &&
2067 3 * II->getName().edit_distance(CurDecl->getIdentifier()->getName())
2068 < II->getLength()) {
2069 II = CurDecl->getIdentifier();
2070 return true;
2071 }
2072
2073 return false;
2074}
2075
2076/// \brief Determine whether the given class is a base class of the given
2077/// class, including looking at dependent bases.
2078static bool findCircularInheritance(const CXXRecordDecl *Class,
2079 const CXXRecordDecl *Current) {
2080 SmallVector<const CXXRecordDecl*, 8> Queue;
2081
2082 Class = Class->getCanonicalDecl();
2083 while (true) {
2084 for (const auto &I : Current->bases()) {
2085 CXXRecordDecl *Base = I.getType()->getAsCXXRecordDecl();
2086 if (!Base)
2087 continue;
2088
2089 Base = Base->getDefinition();
2090 if (!Base)
2091 continue;
2092
2093 if (Base->getCanonicalDecl() == Class)
2094 return true;
2095
2096 Queue.push_back(Base);
2097 }
2098
2099 if (Queue.empty())
2100 return false;
2101
2102 Current = Queue.pop_back_val();
2103 }
2104
2105 return false;
2106}
2107
2108/// \brief Check the validity of a C++ base class specifier.
2109///
2110/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics
2111/// and returns NULL otherwise.
2112CXXBaseSpecifier *
2113Sema::CheckBaseSpecifier(CXXRecordDecl *Class,
2114 SourceRange SpecifierRange,
2115 bool Virtual, AccessSpecifier Access,
2116 TypeSourceInfo *TInfo,
2117 SourceLocation EllipsisLoc) {
2118 QualType BaseType = TInfo->getType();
2119
2120 // C++ [class.union]p1:
2121 // A union shall not have base classes.
2122 if (Class->isUnion()) {
2123 Diag(Class->getLocation(), diag::err_base_clause_on_union)
2124 << SpecifierRange;
2125 return nullptr;
2126 }
2127
2128 if (EllipsisLoc.isValid() &&
2129 !TInfo->getType()->containsUnexpandedParameterPack()) {
2130 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs)
2131 << TInfo->getTypeLoc().getSourceRange();
2132 EllipsisLoc = SourceLocation();
2133 }
2134
2135 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc();
2136
2137 if (BaseType->isDependentType()) {
2138 // Make sure that we don't have circular inheritance among our dependent
2139 // bases. For non-dependent bases, the check for completeness below handles
2140 // this.
2141 if (CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl()) {
2142 if (BaseDecl->getCanonicalDecl() == Class->getCanonicalDecl() ||
2143 ((BaseDecl = BaseDecl->getDefinition()) &&
2144 findCircularInheritance(Class, BaseDecl))) {
2145 Diag(BaseLoc, diag::err_circular_inheritance)
2146 << BaseType << Context.getTypeDeclType(Class);
2147
2148 if (BaseDecl->getCanonicalDecl() != Class->getCanonicalDecl())
2149 Diag(BaseDecl->getLocation(), diag::note_previous_decl)
2150 << BaseType;
2151
2152 return nullptr;
2153 }
2154 }
2155
2156 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual,
2157 Class->getTagKind() == TTK_Class,
2158 Access, TInfo, EllipsisLoc);
2159 }
2160
2161 // Base specifiers must be record types.
2162 if (!BaseType->isRecordType()) {
2163 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange;
2164 return nullptr;
2165 }
2166
2167 // C++ [class.union]p1:
2168 // A union shall not be used as a base class.
2169 if (BaseType->isUnionType()) {
2170 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange;
2171 return nullptr;
2172 }
2173
2174 // For the MS ABI, propagate DLL attributes to base class templates.
2175 if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
2176 if (Attr *ClassAttr = getDLLAttr(Class)) {
2177 if (auto *BaseTemplate = dyn_cast_or_null<ClassTemplateSpecializationDecl>(
2178 BaseType->getAsCXXRecordDecl())) {
2179 propagateDLLAttrToBaseClassTemplate(Class, ClassAttr, BaseTemplate,
2180 BaseLoc);
2181 }
2182 }
2183 }
2184
2185 // C++ [class.derived]p2:
2186 // The class-name in a base-specifier shall not be an incompletely
2187 // defined class.
2188 if (RequireCompleteType(BaseLoc, BaseType,
2189 diag::err_incomplete_base_class, SpecifierRange)) {
2190 Class->setInvalidDecl();
2191 return nullptr;
2192 }
2193
2194 // If the base class is polymorphic or isn't empty, the new one is/isn't, too.
2195 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl();
2196 assert(BaseDecl && "Record type has no declaration")((BaseDecl && "Record type has no declaration") ? static_cast
<void> (0) : __assert_fail ("BaseDecl && \"Record type has no declaration\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2196, __PRETTY_FUNCTION__))
;
2197 BaseDecl = BaseDecl->getDefinition();
2198 assert(BaseDecl && "Base type is not incomplete, but has no definition")((BaseDecl && "Base type is not incomplete, but has no definition"
) ? static_cast<void> (0) : __assert_fail ("BaseDecl && \"Base type is not incomplete, but has no definition\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2198, __PRETTY_FUNCTION__))
;
2199 CXXRecordDecl *CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl);
2200 assert(CXXBaseDecl && "Base type is not a C++ type")((CXXBaseDecl && "Base type is not a C++ type") ? static_cast
<void> (0) : __assert_fail ("CXXBaseDecl && \"Base type is not a C++ type\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2200, __PRETTY_FUNCTION__))
;
2201
2202 // A class which contains a flexible array member is not suitable for use as a
2203 // base class:
2204 // - If the layout determines that a base comes before another base,
2205 // the flexible array member would index into the subsequent base.
2206 // - If the layout determines that base comes before the derived class,
2207 // the flexible array member would index into the derived class.
2208 if (CXXBaseDecl->hasFlexibleArrayMember()) {
2209 Diag(BaseLoc, diag::err_base_class_has_flexible_array_member)
2210 << CXXBaseDecl->getDeclName();
2211 return nullptr;
2212 }
2213
2214 // C++ [class]p3:
2215 // If a class is marked final and it appears as a base-type-specifier in
2216 // base-clause, the program is ill-formed.
2217 if (FinalAttr *FA = CXXBaseDecl->getAttr<FinalAttr>()) {
2218 Diag(BaseLoc, diag::err_class_marked_final_used_as_base)
2219 << CXXBaseDecl->getDeclName()
2220 << FA->isSpelledAsSealed();
2221 Diag(CXXBaseDecl->getLocation(), diag::note_entity_declared_at)
2222 << CXXBaseDecl->getDeclName() << FA->getRange();
2223 return nullptr;
2224 }
2225
2226 if (BaseDecl->isInvalidDecl())
2227 Class->setInvalidDecl();
2228
2229 // Create the base specifier.
2230 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual,
2231 Class->getTagKind() == TTK_Class,
2232 Access, TInfo, EllipsisLoc);
2233}
2234
2235/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is
2236/// one entry in the base class list of a class specifier, for
2237/// example:
2238/// class foo : public bar, virtual private baz {
2239/// 'public bar' and 'virtual private baz' are each base-specifiers.
2240BaseResult
2241Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange,
2242 ParsedAttributes &Attributes,
2243 bool Virtual, AccessSpecifier Access,
2244 ParsedType basetype, SourceLocation BaseLoc,
2245 SourceLocation EllipsisLoc) {
2246 if (!classdecl)
2247 return true;
2248
2249 AdjustDeclIfTemplate(classdecl);
2250 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl);
2251 if (!Class)
2252 return true;
2253
2254 // We haven't yet attached the base specifiers.
2255 Class->setIsParsingBaseSpecifiers();
2256
2257 // We do not support any C++11 attributes on base-specifiers yet.
2258 // Diagnose any attributes we see.
2259 if (!Attributes.empty()) {
2260 for (AttributeList *Attr = Attributes.getList(); Attr;
2261 Attr = Attr->getNext()) {
2262 if (Attr->isInvalid() ||
2263 Attr->getKind() == AttributeList::IgnoredAttribute)
2264 continue;
2265 Diag(Attr->getLoc(),
2266 Attr->getKind() == AttributeList::UnknownAttribute
2267 ? diag::warn_unknown_attribute_ignored
2268 : diag::err_base_specifier_attribute)
2269 << Attr->getName();
2270 }
2271 }
2272
2273 TypeSourceInfo *TInfo = nullptr;
2274 GetTypeFromParser(basetype, &TInfo);
2275
2276 if (EllipsisLoc.isInvalid() &&
2277 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo,
2278 UPPC_BaseType))
2279 return true;
2280
2281 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange,
2282 Virtual, Access, TInfo,
2283 EllipsisLoc))
2284 return BaseSpec;
2285 else
2286 Class->setInvalidDecl();
2287
2288 return true;
2289}
2290
2291/// Use small set to collect indirect bases. As this is only used
2292/// locally, there's no need to abstract the small size parameter.
2293typedef llvm::SmallPtrSet<QualType, 4> IndirectBaseSet;
2294
2295/// \brief Recursively add the bases of Type. Don't add Type itself.
2296static void
2297NoteIndirectBases(ASTContext &Context, IndirectBaseSet &Set,
2298 const QualType &Type)
2299{
2300 // Even though the incoming type is a base, it might not be
2301 // a class -- it could be a template parm, for instance.
2302 if (auto Rec = Type->getAs<RecordType>()) {
2303 auto Decl = Rec->getAsCXXRecordDecl();
2304
2305 // Iterate over its bases.
2306 for (const auto &BaseSpec : Decl->bases()) {
2307 QualType Base = Context.getCanonicalType(BaseSpec.getType())
2308 .getUnqualifiedType();
2309 if (Set.insert(Base).second)
2310 // If we've not already seen it, recurse.
2311 NoteIndirectBases(Context, Set, Base);
2312 }
2313 }
2314}
2315
2316/// \brief Performs the actual work of attaching the given base class
2317/// specifiers to a C++ class.
2318bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class,
2319 MutableArrayRef<CXXBaseSpecifier *> Bases) {
2320 if (Bases.empty())
2321 return false;
2322
2323 // Used to keep track of which base types we have already seen, so
2324 // that we can properly diagnose redundant direct base types. Note
2325 // that the key is always the unqualified canonical type of the base
2326 // class.
2327 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes;
2328
2329 // Used to track indirect bases so we can see if a direct base is
2330 // ambiguous.
2331 IndirectBaseSet IndirectBaseTypes;
2332
2333 // Copy non-redundant base specifiers into permanent storage.
2334 unsigned NumGoodBases = 0;
2335 bool Invalid = false;
2336 for (unsigned idx = 0; idx < Bases.size(); ++idx) {
2337 QualType NewBaseType
2338 = Context.getCanonicalType(Bases[idx]->getType());
2339 NewBaseType = NewBaseType.getLocalUnqualifiedType();
2340
2341 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType];
2342 if (KnownBase) {
2343 // C++ [class.mi]p3:
2344 // A class shall not be specified as a direct base class of a
2345 // derived class more than once.
2346 Diag(Bases[idx]->getLocStart(),
2347 diag::err_duplicate_base_class)
2348 << KnownBase->getType()
2349 << Bases[idx]->getSourceRange();
2350
2351 // Delete the duplicate base class specifier; we're going to
2352 // overwrite its pointer later.
2353 Context.Deallocate(Bases[idx]);
2354
2355 Invalid = true;
2356 } else {
2357 // Okay, add this new base class.
2358 KnownBase = Bases[idx];
2359 Bases[NumGoodBases++] = Bases[idx];
2360
2361 // Note this base's direct & indirect bases, if there could be ambiguity.
2362 if (Bases.size() > 1)
2363 NoteIndirectBases(Context, IndirectBaseTypes, NewBaseType);
2364
2365 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) {
2366 const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl());
2367 if (Class->isInterface() &&
2368 (!RD->isInterface() ||
2369 KnownBase->getAccessSpecifier() != AS_public)) {
2370 // The Microsoft extension __interface does not permit bases that
2371 // are not themselves public interfaces.
2372 Diag(KnownBase->getLocStart(), diag::err_invalid_base_in_interface)
2373 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getName()
2374 << RD->getSourceRange();
2375 Invalid = true;
2376 }
2377 if (RD->hasAttr<WeakAttr>())
2378 Class->addAttr(WeakAttr::CreateImplicit(Context));
2379 }
2380 }
2381 }
2382
2383 // Attach the remaining base class specifiers to the derived class.
2384 Class->setBases(Bases.data(), NumGoodBases);
2385
2386 for (unsigned idx = 0; idx < NumGoodBases; ++idx) {
2387 // Check whether this direct base is inaccessible due to ambiguity.
2388 QualType BaseType = Bases[idx]->getType();
2389 CanQualType CanonicalBase = Context.getCanonicalType(BaseType)
2390 .getUnqualifiedType();
2391
2392 if (IndirectBaseTypes.count(CanonicalBase)) {
2393 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
2394 /*DetectVirtual=*/true);
2395 bool found
2396 = Class->isDerivedFrom(CanonicalBase->getAsCXXRecordDecl(), Paths);
2397 assert(found)((found) ? static_cast<void> (0) : __assert_fail ("found"
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2397, __PRETTY_FUNCTION__))
;
2398 (void)found;
2399
2400 if (Paths.isAmbiguous(CanonicalBase))
2401 Diag(Bases[idx]->getLocStart (), diag::warn_inaccessible_base_class)
2402 << BaseType << getAmbiguousPathsDisplayString(Paths)
2403 << Bases[idx]->getSourceRange();
2404 else
2405 assert(Bases[idx]->isVirtual())((Bases[idx]->isVirtual()) ? static_cast<void> (0) :
__assert_fail ("Bases[idx]->isVirtual()", "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2405, __PRETTY_FUNCTION__))
;
2406 }
2407
2408 // Delete the base class specifier, since its data has been copied
2409 // into the CXXRecordDecl.
2410 Context.Deallocate(Bases[idx]);
2411 }
2412
2413 return Invalid;
2414}
2415
2416/// ActOnBaseSpecifiers - Attach the given base specifiers to the
2417/// class, after checking whether there are any duplicate base
2418/// classes.
2419void Sema::ActOnBaseSpecifiers(Decl *ClassDecl,
2420 MutableArrayRef<CXXBaseSpecifier *> Bases) {
2421 if (!ClassDecl || Bases.empty())
2422 return;
2423
2424 AdjustDeclIfTemplate(ClassDecl);
2425 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), Bases);
2426}
2427
2428/// \brief Determine whether the type \p Derived is a C++ class that is
2429/// derived from the type \p Base.
2430bool Sema::IsDerivedFrom(SourceLocation Loc, QualType Derived, QualType Base) {
2431 if (!getLangOpts().CPlusPlus)
2432 return false;
2433
2434 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl();
2435 if (!DerivedRD)
2436 return false;
2437
2438 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl();
2439 if (!BaseRD)
2440 return false;
2441
2442 // If either the base or the derived type is invalid, don't try to
2443 // check whether one is derived from the other.
2444 if (BaseRD->isInvalidDecl() || DerivedRD->isInvalidDecl())
2445 return false;
2446
2447 // FIXME: In a modules build, do we need the entire path to be visible for us
2448 // to be able to use the inheritance relationship?
2449 if (!isCompleteType(Loc, Derived) && !DerivedRD->isBeingDefined())
2450 return false;
2451
2452 return DerivedRD->isDerivedFrom(BaseRD);
2453}
2454
2455/// \brief Determine whether the type \p Derived is a C++ class that is
2456/// derived from the type \p Base.
2457bool Sema::IsDerivedFrom(SourceLocation Loc, QualType Derived, QualType Base,
2458 CXXBasePaths &Paths) {
2459 if (!getLangOpts().CPlusPlus)
2460 return false;
2461
2462 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl();
2463 if (!DerivedRD)
2464 return false;
2465
2466 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl();
2467 if (!BaseRD)
2468 return false;
2469
2470 if (!isCompleteType(Loc, Derived) && !DerivedRD->isBeingDefined())
2471 return false;
2472
2473 return DerivedRD->isDerivedFrom(BaseRD, Paths);
2474}
2475
2476void Sema::BuildBasePathArray(const CXXBasePaths &Paths,
2477 CXXCastPath &BasePathArray) {
2478 assert(BasePathArray.empty() && "Base path array must be empty!")((BasePathArray.empty() && "Base path array must be empty!"
) ? static_cast<void> (0) : __assert_fail ("BasePathArray.empty() && \"Base path array must be empty!\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2478, __PRETTY_FUNCTION__))
;
2479 assert(Paths.isRecordingPaths() && "Must record paths!")((Paths.isRecordingPaths() && "Must record paths!") ?
static_cast<void> (0) : __assert_fail ("Paths.isRecordingPaths() && \"Must record paths!\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2479, __PRETTY_FUNCTION__))
;
2480
2481 const CXXBasePath &Path = Paths.front();
2482
2483 // We first go backward and check if we have a virtual base.
2484 // FIXME: It would be better if CXXBasePath had the base specifier for
2485 // the nearest virtual base.
2486 unsigned Start = 0;
2487 for (unsigned I = Path.size(); I != 0; --I) {
2488 if (Path[I - 1].Base->isVirtual()) {
2489 Start = I - 1;
2490 break;
2491 }
2492 }
2493
2494 // Now add all bases.
2495 for (unsigned I = Start, E = Path.size(); I != E; ++I)
2496 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base));
2497}
2498
2499/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base
2500/// conversion (where Derived and Base are class types) is
2501/// well-formed, meaning that the conversion is unambiguous (and
2502/// that all of the base classes are accessible). Returns true
2503/// and emits a diagnostic if the code is ill-formed, returns false
2504/// otherwise. Loc is the location where this routine should point to
2505/// if there is an error, and Range is the source range to highlight
2506/// if there is an error.
2507///
2508/// If either InaccessibleBaseID or AmbigiousBaseConvID are 0, then the
2509/// diagnostic for the respective type of error will be suppressed, but the
2510/// check for ill-formed code will still be performed.
2511bool
2512Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base,
2513 unsigned InaccessibleBaseID,
2514 unsigned AmbigiousBaseConvID,
2515 SourceLocation Loc, SourceRange Range,
2516 DeclarationName Name,
2517 CXXCastPath *BasePath,
2518 bool IgnoreAccess) {
2519 // First, determine whether the path from Derived to Base is
2520 // ambiguous. This is slightly more expensive than checking whether
2521 // the Derived to Base conversion exists, because here we need to
2522 // explore multiple paths to determine if there is an ambiguity.
2523 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
2524 /*DetectVirtual=*/false);
2525 bool DerivationOkay = IsDerivedFrom(Loc, Derived, Base, Paths);
2526 assert(DerivationOkay &&((DerivationOkay && "Can only be used with a derived-to-base conversion"
) ? static_cast<void> (0) : __assert_fail ("DerivationOkay && \"Can only be used with a derived-to-base conversion\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2527, __PRETTY_FUNCTION__))
2527 "Can only be used with a derived-to-base conversion")((DerivationOkay && "Can only be used with a derived-to-base conversion"
) ? static_cast<void> (0) : __assert_fail ("DerivationOkay && \"Can only be used with a derived-to-base conversion\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2527, __PRETTY_FUNCTION__))
;
2528 (void)DerivationOkay;
2529
2530 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) {
2531 if (!IgnoreAccess) {
2532 // Check that the base class can be accessed.
2533 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(),
2534 InaccessibleBaseID)) {
2535 case AR_inaccessible:
2536 return true;
2537 case AR_accessible:
2538 case AR_dependent:
2539 case AR_delayed:
2540 break;
2541 }
2542 }
2543
2544 // Build a base path if necessary.
2545 if (BasePath)
2546 BuildBasePathArray(Paths, *BasePath);
2547 return false;
2548 }
2549
2550 if (AmbigiousBaseConvID) {
2551 // We know that the derived-to-base conversion is ambiguous, and
2552 // we're going to produce a diagnostic. Perform the derived-to-base
2553 // search just one more time to compute all of the possible paths so
2554 // that we can print them out. This is more expensive than any of
2555 // the previous derived-to-base checks we've done, but at this point
2556 // performance isn't as much of an issue.
2557 Paths.clear();
2558 Paths.setRecordingPaths(true);
2559 bool StillOkay = IsDerivedFrom(Loc, Derived, Base, Paths);
2560 assert(StillOkay && "Can only be used with a derived-to-base conversion")((StillOkay && "Can only be used with a derived-to-base conversion"
) ? static_cast<void> (0) : __assert_fail ("StillOkay && \"Can only be used with a derived-to-base conversion\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2560, __PRETTY_FUNCTION__))
;
2561 (void)StillOkay;
2562
2563 // Build up a textual representation of the ambiguous paths, e.g.,
2564 // D -> B -> A, that will be used to illustrate the ambiguous
2565 // conversions in the diagnostic. We only print one of the paths
2566 // to each base class subobject.
2567 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths);
2568
2569 Diag(Loc, AmbigiousBaseConvID)
2570 << Derived << Base << PathDisplayStr << Range << Name;
2571 }
2572 return true;
2573}
2574
2575bool
2576Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base,
2577 SourceLocation Loc, SourceRange Range,
2578 CXXCastPath *BasePath,
2579 bool IgnoreAccess) {
2580 return CheckDerivedToBaseConversion(
2581 Derived, Base, diag::err_upcast_to_inaccessible_base,
2582 diag::err_ambiguous_derived_to_base_conv, Loc, Range, DeclarationName(),
2583 BasePath, IgnoreAccess);
2584}
2585
2586
2587/// @brief Builds a string representing ambiguous paths from a
2588/// specific derived class to different subobjects of the same base
2589/// class.
2590///
2591/// This function builds a string that can be used in error messages
2592/// to show the different paths that one can take through the
2593/// inheritance hierarchy to go from the derived class to different
2594/// subobjects of a base class. The result looks something like this:
2595/// @code
2596/// struct D -> struct B -> struct A
2597/// struct D -> struct C -> struct A
2598/// @endcode
2599std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) {
2600 std::string PathDisplayStr;
2601 std::set<unsigned> DisplayedPaths;
2602 for (CXXBasePaths::paths_iterator Path = Paths.begin();
2603 Path != Paths.end(); ++Path) {
2604 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) {
2605 // We haven't displayed a path to this particular base
2606 // class subobject yet.
2607 PathDisplayStr += "\n ";
2608 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString();
2609 for (CXXBasePath::const_iterator Element = Path->begin();
2610 Element != Path->end(); ++Element)
2611 PathDisplayStr += " -> " + Element->Base->getType().getAsString();
2612 }
2613 }
2614
2615 return PathDisplayStr;
2616}
2617
2618//===----------------------------------------------------------------------===//
2619// C++ class member Handling
2620//===----------------------------------------------------------------------===//
2621
2622/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon.
2623bool Sema::ActOnAccessSpecifier(AccessSpecifier Access,
2624 SourceLocation ASLoc,
2625 SourceLocation ColonLoc,
2626 AttributeList *Attrs) {
2627 assert(Access != AS_none && "Invalid kind for syntactic access specifier!")((Access != AS_none && "Invalid kind for syntactic access specifier!"
) ? static_cast<void> (0) : __assert_fail ("Access != AS_none && \"Invalid kind for syntactic access specifier!\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2627, __PRETTY_FUNCTION__))
;
2628 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext,
2629 ASLoc, ColonLoc);
2630 CurContext->addHiddenDecl(ASDecl);
2631 return ProcessAccessDeclAttributeList(ASDecl, Attrs);
2632}
2633
2634/// CheckOverrideControl - Check C++11 override control semantics.
2635void Sema::CheckOverrideControl(NamedDecl *D) {
2636 if (D->isInvalidDecl())
2637 return;
2638
2639 // We only care about "override" and "final" declarations.
2640 if (!D->hasAttr<OverrideAttr>() && !D->hasAttr<FinalAttr>())
2641 return;
2642
2643 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D);
2644
2645 // We can't check dependent instance methods.
2646 if (MD && MD->isInstance() &&
2647 (MD->getParent()->hasAnyDependentBases() ||
2648 MD->getType()->isDependentType()))
2649 return;
2650
2651 if (MD && !MD->isVirtual()) {
2652 // If we have a non-virtual method, check if if hides a virtual method.
2653 // (In that case, it's most likely the method has the wrong type.)
2654 SmallVector<CXXMethodDecl *, 8> OverloadedMethods;
2655 FindHiddenVirtualMethods(MD, OverloadedMethods);
2656
2657 if (!OverloadedMethods.empty()) {
2658 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) {
2659 Diag(OA->getLocation(),
2660 diag::override_keyword_hides_virtual_member_function)
2661 << "override" << (OverloadedMethods.size() > 1);
2662 } else if (FinalAttr *FA = D->getAttr<FinalAttr>()) {
2663 Diag(FA->getLocation(),
2664 diag::override_keyword_hides_virtual_member_function)
2665 << (FA->isSpelledAsSealed() ? "sealed" : "final")
2666 << (OverloadedMethods.size() > 1);
2667 }
2668 NoteHiddenVirtualMethods(MD, OverloadedMethods);
2669 MD->setInvalidDecl();
2670 return;
2671 }
2672 // Fall through into the general case diagnostic.
2673 // FIXME: We might want to attempt typo correction here.
2674 }
2675
2676 if (!MD || !MD->isVirtual()) {
2677 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) {
2678 Diag(OA->getLocation(),
2679 diag::override_keyword_only_allowed_on_virtual_member_functions)
2680 << "override" << FixItHint::CreateRemoval(OA->getLocation());
2681 D->dropAttr<OverrideAttr>();
2682 }
2683 if (FinalAttr *FA = D->getAttr<FinalAttr>()) {
2684 Diag(FA->getLocation(),
2685 diag::override_keyword_only_allowed_on_virtual_member_functions)
2686 << (FA->isSpelledAsSealed() ? "sealed" : "final")
2687 << FixItHint::CreateRemoval(FA->getLocation());
2688 D->dropAttr<FinalAttr>();
2689 }
2690 return;
2691 }
2692
2693 // C++11 [class.virtual]p5:
2694 // If a function is marked with the virt-specifier override and
2695 // does not override a member function of a base class, the program is
2696 // ill-formed.
2697 bool HasOverriddenMethods =
2698 MD->begin_overridden_methods() != MD->end_overridden_methods();
2699 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods)
2700 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding)
2701 << MD->getDeclName();
2702}
2703
2704void Sema::DiagnoseAbsenceOfOverrideControl(NamedDecl *D) {
2705 if (D->isInvalidDecl() || D->hasAttr<OverrideAttr>())
2706 return;
2707 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D);
2708 if (!MD || MD->isImplicit() || MD->hasAttr<FinalAttr>() ||
2709 isa<CXXDestructorDecl>(MD))
2710 return;
2711
2712 SourceLocation Loc = MD->getLocation();
2713 SourceLocation SpellingLoc = Loc;
2714 if (getSourceManager().isMacroArgExpansion(Loc))
2715 SpellingLoc = getSourceManager().getImmediateExpansionRange(Loc).first;
2716 SpellingLoc = getSourceManager().getSpellingLoc(SpellingLoc);
2717 if (SpellingLoc.isValid() && getSourceManager().isInSystemHeader(SpellingLoc))
2718 return;
2719
2720 if (MD->size_overridden_methods() > 0) {
2721 Diag(MD->getLocation(), diag::warn_function_marked_not_override_overriding)
2722 << MD->getDeclName();
2723 const CXXMethodDecl *OMD = *MD->begin_overridden_methods();
2724 Diag(OMD->getLocation(), diag::note_overridden_virtual_function);
2725 }
2726}
2727
2728/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member
2729/// function overrides a virtual member function marked 'final', according to
2730/// C++11 [class.virtual]p4.
2731bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New,
2732 const CXXMethodDecl *Old) {
2733 FinalAttr *FA = Old->getAttr<FinalAttr>();
2734 if (!FA)
2735 return false;
2736
2737 Diag(New->getLocation(), diag::err_final_function_overridden)
2738 << New->getDeclName()
2739 << FA->isSpelledAsSealed();
2740 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
2741 return true;
2742}
2743
2744static bool InitializationHasSideEffects(const FieldDecl &FD) {
2745 const Type *T = FD.getType()->getBaseElementTypeUnsafe();
2746 // FIXME: Destruction of ObjC lifetime types has side-effects.
2747 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
2748 return !RD->isCompleteDefinition() ||
2749 !RD->hasTrivialDefaultConstructor() ||
2750 !RD->hasTrivialDestructor();
2751 return false;
2752}
2753
2754static AttributeList *getMSPropertyAttr(AttributeList *list) {
2755 for (AttributeList *it = list; it != nullptr; it = it->getNext())
2756 if (it->isDeclspecPropertyAttribute())
2757 return it;
2758 return nullptr;
2759}
2760
2761/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member
2762/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the
2763/// bitfield width if there is one, 'InitExpr' specifies the initializer if
2764/// one has been parsed, and 'InitStyle' is set if an in-class initializer is
2765/// present (but parsing it has been deferred).
2766NamedDecl *
2767Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D,
2768 MultiTemplateParamsArg TemplateParameterLists,
2769 Expr *BW, const VirtSpecifiers &VS,
2770 InClassInitStyle InitStyle) {
2771 const DeclSpec &DS = D.getDeclSpec();
2772 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
2773 DeclarationName Name = NameInfo.getName();
2774 SourceLocation Loc = NameInfo.getLoc();
2775
2776 // For anonymous bitfields, the location should point to the type.
2777 if (Loc.isInvalid())
2778 Loc = D.getLocStart();
2779
2780 Expr *BitWidth = static_cast<Expr*>(BW);
2781
2782 assert(isa<CXXRecordDecl>(CurContext))((isa<CXXRecordDecl>(CurContext)) ? static_cast<void
> (0) : __assert_fail ("isa<CXXRecordDecl>(CurContext)"
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2782, __PRETTY_FUNCTION__))
;
2783 assert(!DS.isFriendSpecified())((!DS.isFriendSpecified()) ? static_cast<void> (0) : __assert_fail
("!DS.isFriendSpecified()", "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2783, __PRETTY_FUNCTION__))
;
2784
2785 bool isFunc = D.isDeclarationOfFunction();
2786
2787 if (cast<CXXRecordDecl>(CurContext)->isInterface()) {
2788 // The Microsoft extension __interface only permits public member functions
2789 // and prohibits constructors, destructors, operators, non-public member
2790 // functions, static methods and data members.
2791 unsigned InvalidDecl;
2792 bool ShowDeclName = true;
2793 if (!isFunc)
2794 InvalidDecl = (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) ? 0 : 1;
2795 else if (AS != AS_public)
2796 InvalidDecl = 2;
2797 else if (DS.getStorageClassSpec() == DeclSpec::SCS_static)
2798 InvalidDecl = 3;
2799 else switch (Name.getNameKind()) {
2800 case DeclarationName::CXXConstructorName:
2801 InvalidDecl = 4;
2802 ShowDeclName = false;
2803 break;
2804
2805 case DeclarationName::CXXDestructorName:
2806 InvalidDecl = 5;
2807 ShowDeclName = false;
2808 break;
2809
2810 case DeclarationName::CXXOperatorName:
2811 case DeclarationName::CXXConversionFunctionName:
2812 InvalidDecl = 6;
2813 break;
2814
2815 default:
2816 InvalidDecl = 0;
2817 break;
2818 }
2819
2820 if (InvalidDecl) {
2821 if (ShowDeclName)
2822 Diag(Loc, diag::err_invalid_member_in_interface)
2823 << (InvalidDecl-1) << Name;
2824 else
2825 Diag(Loc, diag::err_invalid_member_in_interface)
2826 << (InvalidDecl-1) << "";
2827 return nullptr;
2828 }
2829 }
2830
2831 // C++ 9.2p6: A member shall not be declared to have automatic storage
2832 // duration (auto, register) or with the extern storage-class-specifier.
2833 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class
2834 // data members and cannot be applied to names declared const or static,
2835 // and cannot be applied to reference members.
2836 switch (DS.getStorageClassSpec()) {
2837 case DeclSpec::SCS_unspecified:
2838 case DeclSpec::SCS_typedef:
2839 case DeclSpec::SCS_static:
2840 break;
2841 case DeclSpec::SCS_mutable:
2842 if (isFunc) {
2843 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function);
2844
2845 // FIXME: It would be nicer if the keyword was ignored only for this
2846 // declarator. Otherwise we could get follow-up errors.
2847 D.getMutableDeclSpec().ClearStorageClassSpecs();
2848 }
2849 break;
2850 default:
2851 Diag(DS.getStorageClassSpecLoc(),
2852 diag::err_storageclass_invalid_for_member);
2853 D.getMutableDeclSpec().ClearStorageClassSpecs();
2854 break;
2855 }
2856
2857 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified ||
2858 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) &&
2859 !isFunc);
2860
2861 if (DS.isConstexprSpecified() && isInstField) {
2862 SemaDiagnosticBuilder B =
2863 Diag(DS.getConstexprSpecLoc(), diag::err_invalid_constexpr_member);
2864 SourceLocation ConstexprLoc = DS.getConstexprSpecLoc();
2865 if (InitStyle == ICIS_NoInit) {
2866 B << 0 << 0;
2867 if (D.getDeclSpec().getTypeQualifiers() & DeclSpec::TQ_const)
2868 B << FixItHint::CreateRemoval(ConstexprLoc);
2869 else {
2870 B << FixItHint::CreateReplacement(ConstexprLoc, "const");
2871 D.getMutableDeclSpec().ClearConstexprSpec();
2872 const char *PrevSpec;
2873 unsigned DiagID;
2874 bool Failed = D.getMutableDeclSpec().SetTypeQual(
2875 DeclSpec::TQ_const, ConstexprLoc, PrevSpec, DiagID, getLangOpts());
2876 (void)Failed;
2877 assert(!Failed && "Making a constexpr member const shouldn't fail")((!Failed && "Making a constexpr member const shouldn't fail"
) ? static_cast<void> (0) : __assert_fail ("!Failed && \"Making a constexpr member const shouldn't fail\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2877, __PRETTY_FUNCTION__))
;
2878 }
2879 } else {
2880 B << 1;
2881 const char *PrevSpec;
2882 unsigned DiagID;
2883 if (D.getMutableDeclSpec().SetStorageClassSpec(
2884 *this, DeclSpec::SCS_static, ConstexprLoc, PrevSpec, DiagID,
2885 Context.getPrintingPolicy())) {
2886 assert(DS.getStorageClassSpec() == DeclSpec::SCS_mutable &&((DS.getStorageClassSpec() == DeclSpec::SCS_mutable &&
"This is the only DeclSpec that should fail to be applied") ?
static_cast<void> (0) : __assert_fail ("DS.getStorageClassSpec() == DeclSpec::SCS_mutable && \"This is the only DeclSpec that should fail to be applied\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2887, __PRETTY_FUNCTION__))
2887 "This is the only DeclSpec that should fail to be applied")((DS.getStorageClassSpec() == DeclSpec::SCS_mutable &&
"This is the only DeclSpec that should fail to be applied") ?
static_cast<void> (0) : __assert_fail ("DS.getStorageClassSpec() == DeclSpec::SCS_mutable && \"This is the only DeclSpec that should fail to be applied\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 2887, __PRETTY_FUNCTION__))
;
2888 B << 1;
2889 } else {
2890 B << 0 << FixItHint::CreateInsertion(ConstexprLoc, "static ");
2891 isInstField = false;
2892 }
2893 }
2894 }
2895
2896 NamedDecl *Member;
2897 if (isInstField) {
2898 CXXScopeSpec &SS = D.getCXXScopeSpec();
2899
2900 // Data members must have identifiers for names.
2901 if (!Name.isIdentifier()) {
2902 Diag(Loc, diag::err_bad_variable_name)
2903 << Name;
2904 return nullptr;
2905 }
2906
2907 IdentifierInfo *II = Name.getAsIdentifierInfo();
2908
2909 // Member field could not be with "template" keyword.
2910 // So TemplateParameterLists should be empty in this case.
2911 if (TemplateParameterLists.size()) {
2912 TemplateParameterList* TemplateParams = TemplateParameterLists[0];
2913 if (TemplateParams->size()) {
2914 // There is no such thing as a member field template.
2915 Diag(D.getIdentifierLoc(), diag::err_template_member)
2916 << II
2917 << SourceRange(TemplateParams->getTemplateLoc(),
2918 TemplateParams->getRAngleLoc());
2919 } else {
2920 // There is an extraneous 'template<>' for this member.
2921 Diag(TemplateParams->getTemplateLoc(),
2922 diag::err_template_member_noparams)
2923 << II
2924 << SourceRange(TemplateParams->getTemplateLoc(),
2925 TemplateParams->getRAngleLoc());
2926 }
2927 return nullptr;
2928 }
2929
2930 if (SS.isSet() && !SS.isInvalid()) {
2931 // The user provided a superfluous scope specifier inside a class
2932 // definition:
2933 //
2934 // class X {
2935 // int X::member;
2936 // };
2937 if (DeclContext *DC = computeDeclContext(SS, false))
2938 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc());
2939 else
2940 Diag(D.getIdentifierLoc(), diag::err_member_qualification)
2941 << Name << SS.getRange();
2942
2943 SS.clear();
2944 }
2945
2946 AttributeList *MSPropertyAttr =
2947 getMSPropertyAttr(D.getDeclSpec().getAttributes().getList());
2948 if (MSPropertyAttr) {
2949 Member = HandleMSProperty(S, cast<CXXRecordDecl>(CurContext), Loc, D,
2950 BitWidth, InitStyle, AS, MSPropertyAttr);
2951 if (!Member)
2952 return nullptr;
2953 isInstField = false;
2954 } else {
2955 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D,
2956 BitWidth, InitStyle, AS);
2957 if (!Member)
2958 return nullptr;
2959 }
2960 } else {
2961 Member = HandleDeclarator(S, D, TemplateParameterLists);
2962 if (!Member)
2963 return nullptr;
2964
2965 // Non-instance-fields can't have a bitfield.
2966 if (BitWidth) {
2967 if (Member->isInvalidDecl()) {
2968 // don't emit another diagnostic.
2969 } else if (isa<VarDecl>(Member) || isa<VarTemplateDecl>(Member)) {
2970 // C++ 9.6p3: A bit-field shall not be a static member.
2971 // "static member 'A' cannot be a bit-field"
2972 Diag(Loc, diag::err_static_not_bitfield)
2973 << Name << BitWidth->getSourceRange();
2974 } else if (isa<TypedefDecl>(Member)) {
2975 // "typedef member 'x' cannot be a bit-field"
2976 Diag(Loc, diag::err_typedef_not_bitfield)
2977 << Name << BitWidth->getSourceRange();
2978 } else {
2979 // A function typedef ("typedef int f(); f a;").
2980 // C++ 9.6p3: A bit-field shall have integral or enumeration type.
2981 Diag(Loc, diag::err_not_integral_type_bitfield)
2982 << Name << cast<ValueDecl>(Member)->getType()
2983 << BitWidth->getSourceRange();
2984 }
2985
2986 BitWidth = nullptr;
2987 Member->setInvalidDecl();
2988 }
2989
2990 Member->setAccess(AS);
2991
2992 // If we have declared a member function template or static data member
2993 // template, set the access of the templated declaration as well.
2994 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member))
2995 FunTmpl->getTemplatedDecl()->setAccess(AS);
2996 else if (VarTemplateDecl *VarTmpl = dyn_cast<VarTemplateDecl>(Member))
2997 VarTmpl->getTemplatedDecl()->setAccess(AS);
2998 }
2999
3000 if (VS.isOverrideSpecified())
3001 Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context, 0));
3002 if (VS.isFinalSpecified())
3003 Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context,
3004 VS.isFinalSpelledSealed()));
3005
3006 if (VS.getLastLocation().isValid()) {
3007 // Update the end location of a method that has a virt-specifiers.
3008 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member))
3009 MD->setRangeEnd(VS.getLastLocation());
3010 }
3011
3012 CheckOverrideControl(Member);
3013
3014 assert((Name || isInstField) && "No identifier for non-field ?")(((Name || isInstField) && "No identifier for non-field ?"
) ? static_cast<void> (0) : __assert_fail ("(Name || isInstField) && \"No identifier for non-field ?\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 3014, __PRETTY_FUNCTION__))
;
3015
3016 if (isInstField) {
3017 FieldDecl *FD = cast<FieldDecl>(Member);
3018 FieldCollector->Add(FD);
3019
3020 if (!Diags.isIgnored(diag::warn_unused_private_field, FD->getLocation())) {
3021 // Remember all explicit private FieldDecls that have a name, no side
3022 // effects and are not part of a dependent type declaration.
3023 if (!FD->isImplicit() && FD->getDeclName() &&
3024 FD->getAccess() == AS_private &&
3025 !FD->hasAttr<UnusedAttr>() &&
3026 !FD->getParent()->isDependentContext() &&
3027 !InitializationHasSideEffects(*FD))
3028 UnusedPrivateFields.insert(FD);
3029 }
3030 }
3031
3032 return Member;
3033}
3034
3035namespace {
3036 class UninitializedFieldVisitor
3037 : public EvaluatedExprVisitor<UninitializedFieldVisitor> {
3038 Sema &S;
3039 // List of Decls to generate a warning on. Also remove Decls that become
3040 // initialized.
3041 llvm::SmallPtrSetImpl<ValueDecl*> &Decls;
3042 // List of base classes of the record. Classes are removed after their
3043 // initializers.
3044 llvm::SmallPtrSetImpl<QualType> &BaseClasses;
3045 // Vector of decls to be removed from the Decl set prior to visiting the
3046 // nodes. These Decls may have been initialized in the prior initializer.
3047 llvm::SmallVector<ValueDecl*, 4> DeclsToRemove;
3048 // If non-null, add a note to the warning pointing back to the constructor.
3049 const CXXConstructorDecl *Constructor;
3050 // Variables to hold state when processing an initializer list. When
3051 // InitList is true, special case initialization of FieldDecls matching
3052 // InitListFieldDecl.
3053 bool InitList;
3054 FieldDecl *InitListFieldDecl;
3055 llvm::SmallVector<unsigned, 4> InitFieldIndex;
3056
3057 public:
3058 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited;
3059 UninitializedFieldVisitor(Sema &S,
3060 llvm::SmallPtrSetImpl<ValueDecl*> &Decls,
3061 llvm::SmallPtrSetImpl<QualType> &BaseClasses)
3062 : Inherited(S.Context), S(S), Decls(Decls), BaseClasses(BaseClasses),
3063 Constructor(nullptr), InitList(false), InitListFieldDecl(nullptr) {}
3064
3065 // Returns true if the use of ME is not an uninitialized use.
3066 bool IsInitListMemberExprInitialized(MemberExpr *ME,
3067 bool CheckReferenceOnly) {
3068 llvm::SmallVector<FieldDecl*, 4> Fields;
3069 bool ReferenceField = false;
3070 while (ME) {
3071 FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl());
3072 if (!FD)
3073 return false;
3074 Fields.push_back(FD);
3075 if (FD->getType()->isReferenceType())
3076 ReferenceField = true;
3077 ME = dyn_cast<MemberExpr>(ME->getBase()->IgnoreParenImpCasts());
3078 }
3079
3080 // Binding a reference to an unintialized field is not an
3081 // uninitialized use.
3082 if (CheckReferenceOnly && !ReferenceField)
3083 return true;
3084
3085 llvm::SmallVector<unsigned, 4> UsedFieldIndex;
3086 // Discard the first field since it is the field decl that is being
3087 // initialized.
3088 for (auto I = Fields.rbegin() + 1, E = Fields.rend(); I != E; ++I) {
3089 UsedFieldIndex.push_back((*I)->getFieldIndex());
3090 }
3091
3092 for (auto UsedIter = UsedFieldIndex.begin(),
3093 UsedEnd = UsedFieldIndex.end(),
3094 OrigIter = InitFieldIndex.begin(),
3095 OrigEnd = InitFieldIndex.end();
3096 UsedIter != UsedEnd && OrigIter != OrigEnd; ++UsedIter, ++OrigIter) {
3097 if (*UsedIter < *OrigIter)
3098 return true;
3099 if (*UsedIter > *OrigIter)
3100 break;
3101 }
3102
3103 return false;
3104 }
3105
3106 void HandleMemberExpr(MemberExpr *ME, bool CheckReferenceOnly,
3107 bool AddressOf) {
3108 if (isa<EnumConstantDecl>(ME->getMemberDecl()))
3109 return;
3110
3111 // FieldME is the inner-most MemberExpr that is not an anonymous struct
3112 // or union.
3113 MemberExpr *FieldME = ME;
3114
3115 bool AllPODFields = FieldME->getType().isPODType(S.Context);
3116
3117 Expr *Base = ME;
3118 while (MemberExpr *SubME =
3119 dyn_cast<MemberExpr>(Base->IgnoreParenImpCasts())) {
3120
3121 if (isa<VarDecl>(SubME->getMemberDecl()))
3122 return;
3123
3124 if (FieldDecl *FD = dyn_cast<FieldDecl>(SubME->getMemberDecl()))
3125 if (!FD->isAnonymousStructOrUnion())
3126 FieldME = SubME;
3127
3128 if (!FieldME->getType().isPODType(S.Context))
3129 AllPODFields = false;
3130
3131 Base = SubME->getBase();
3132 }
3133
3134 if (!isa<CXXThisExpr>(Base->IgnoreParenImpCasts()))
3135 return;
3136
3137 if (AddressOf && AllPODFields)
3138 return;
3139
3140 ValueDecl* FoundVD = FieldME->getMemberDecl();
3141
3142 if (ImplicitCastExpr *BaseCast = dyn_cast<ImplicitCastExpr>(Base)) {
3143 while (isa<ImplicitCastExpr>(BaseCast->getSubExpr())) {
3144 BaseCast = cast<ImplicitCastExpr>(BaseCast->getSubExpr());
3145 }
3146
3147 if (BaseCast->getCastKind() == CK_UncheckedDerivedToBase) {
3148 QualType T = BaseCast->getType();
3149 if (T->isPointerType() &&
3150 BaseClasses.count(T->getPointeeType())) {
3151 S.Diag(FieldME->getExprLoc(), diag::warn_base_class_is_uninit)
3152 << T->getPointeeType() << FoundVD;
3153 }
3154 }
3155 }
3156
3157 if (!Decls.count(FoundVD))
3158 return;
3159
3160 const bool IsReference = FoundVD->getType()->isReferenceType();
3161
3162 if (InitList && !AddressOf && FoundVD == InitListFieldDecl) {
3163 // Special checking for initializer lists.
3164 if (IsInitListMemberExprInitialized(ME, CheckReferenceOnly)) {
3165 return;
3166 }
3167 } else {
3168 // Prevent double warnings on use of unbounded references.
3169 if (CheckReferenceOnly && !IsReference)
3170 return;
3171 }
3172
3173 unsigned diag = IsReference
3174 ? diag::warn_reference_field_is_uninit
3175 : diag::warn_field_is_uninit;
3176 S.Diag(FieldME->getExprLoc(), diag) << FoundVD;
3177 if (Constructor)
3178 S.Diag(Constructor->getLocation(),
3179 diag::note_uninit_in_this_constructor)
3180 << (Constructor->isDefaultConstructor() && Constructor->isImplicit());
3181
3182 }
3183
3184 void HandleValue(Expr *E, bool AddressOf) {
3185 E = E->IgnoreParens();
3186
3187 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
3188 HandleMemberExpr(ME, false /*CheckReferenceOnly*/,
3189 AddressOf /*AddressOf*/);
3190 return;
3191 }
3192
3193 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) {
3194 Visit(CO->getCond());
3195 HandleValue(CO->getTrueExpr(), AddressOf);
3196 HandleValue(CO->getFalseExpr(), AddressOf);
3197 return;
3198 }
3199
3200 if (BinaryConditionalOperator *BCO =
3201 dyn_cast<BinaryConditionalOperator>(E)) {
3202 Visit(BCO->getCond());
3203 HandleValue(BCO->getFalseExpr(), AddressOf);
3204 return;
3205 }
3206
3207 if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(E)) {
3208 HandleValue(OVE->getSourceExpr(), AddressOf);
3209 return;
3210 }
3211
3212 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
3213 switch (BO->getOpcode()) {
3214 default:
3215 break;
3216 case(BO_PtrMemD):
3217 case(BO_PtrMemI):
3218 HandleValue(BO->getLHS(), AddressOf);
3219 Visit(BO->getRHS());
3220 return;
3221 case(BO_Comma):
3222 Visit(BO->getLHS());
3223 HandleValue(BO->getRHS(), AddressOf);
3224 return;
3225 }
3226 }
3227
3228 Visit(E);
3229 }
3230
3231 void CheckInitListExpr(InitListExpr *ILE) {
3232 InitFieldIndex.push_back(0);
3233 for (auto Child : ILE->children()) {
3234 if (InitListExpr *SubList = dyn_cast<InitListExpr>(Child)) {
3235 CheckInitListExpr(SubList);
3236 } else {
3237 Visit(Child);
3238 }
3239 ++InitFieldIndex.back();
3240 }
3241 InitFieldIndex.pop_back();
3242 }
3243
3244 void CheckInitializer(Expr *E, const CXXConstructorDecl *FieldConstructor,
3245 FieldDecl *Field, const Type *BaseClass) {
3246 // Remove Decls that may have been initialized in the previous
3247 // initializer.
3248 for (ValueDecl* VD : DeclsToRemove)
3249 Decls.erase(VD);
3250 DeclsToRemove.clear();
3251
3252 Constructor = FieldConstructor;
3253 InitListExpr *ILE = dyn_cast<InitListExpr>(E);
3254
3255 if (ILE && Field) {
3256 InitList = true;
3257 InitListFieldDecl = Field;
3258 InitFieldIndex.clear();
3259 CheckInitListExpr(ILE);
3260 } else {
3261 InitList = false;
3262 Visit(E);
3263 }
3264
3265 if (Field)
3266 Decls.erase(Field);
3267 if (BaseClass)
3268 BaseClasses.erase(BaseClass->getCanonicalTypeInternal());
3269 }
3270
3271 void VisitMemberExpr(MemberExpr *ME) {
3272 // All uses of unbounded reference fields will warn.
3273 HandleMemberExpr(ME, true /*CheckReferenceOnly*/, false /*AddressOf*/);
3274 }
3275
3276 void VisitImplicitCastExpr(ImplicitCastExpr *E) {
3277 if (E->getCastKind() == CK_LValueToRValue) {
3278 HandleValue(E->getSubExpr(), false /*AddressOf*/);
3279 return;
3280 }
3281
3282 Inherited::VisitImplicitCastExpr(E);
3283 }
3284
3285 void VisitCXXConstructExpr(CXXConstructExpr *E) {
3286 if (E->getConstructor()->isCopyConstructor()) {
3287 Expr *ArgExpr = E->getArg(0);
3288 if (InitListExpr *ILE = dyn_cast<InitListExpr>(ArgExpr))
3289 if (ILE->getNumInits() == 1)
3290 ArgExpr = ILE->getInit(0);
3291 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(ArgExpr))
3292 if (ICE->getCastKind() == CK_NoOp)
3293 ArgExpr = ICE->getSubExpr();
3294 HandleValue(ArgExpr, false /*AddressOf*/);
3295 return;
3296 }
3297 Inherited::VisitCXXConstructExpr(E);
3298 }
3299
3300 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) {
3301 Expr *Callee = E->getCallee();
3302 if (isa<MemberExpr>(Callee)) {
3303 HandleValue(Callee, false /*AddressOf*/);
3304 for (auto Arg : E->arguments())
3305 Visit(Arg);
3306 return;
3307 }
3308
3309 Inherited::VisitCXXMemberCallExpr(E);
3310 }
3311
3312 void VisitCallExpr(CallExpr *E) {
3313 // Treat std::move as a use.
3314 if (E->getNumArgs() == 1) {
3315 if (FunctionDecl *FD = E->getDirectCallee()) {
3316 if (FD->isInStdNamespace() && FD->getIdentifier() &&
3317 FD->getIdentifier()->isStr("move")) {
3318 HandleValue(E->getArg(0), false /*AddressOf*/);
3319 return;
3320 }
3321 }
3322 }
3323
3324 Inherited::VisitCallExpr(E);
3325 }
3326
3327 void VisitCXXOperatorCallExpr(CXXOperatorCallExpr *E) {
3328 Expr *Callee = E->getCallee();
3329
3330 if (isa<UnresolvedLookupExpr>(Callee))
3331 return Inherited::VisitCXXOperatorCallExpr(E);
3332
3333 Visit(Callee);
3334 for (auto Arg : E->arguments())
3335 HandleValue(Arg->IgnoreParenImpCasts(), false /*AddressOf*/);
3336 }
3337
3338 void VisitBinaryOperator(BinaryOperator *E) {
3339 // If a field assignment is detected, remove the field from the
3340 // uninitiailized field set.
3341 if (E->getOpcode() == BO_Assign)
3342 if (MemberExpr *ME = dyn_cast<MemberExpr>(E->getLHS()))
3343 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl()))
3344 if (!FD->getType()->isReferenceType())
3345 DeclsToRemove.push_back(FD);
3346
3347 if (E->isCompoundAssignmentOp()) {
3348 HandleValue(E->getLHS(), false /*AddressOf*/);
3349 Visit(E->getRHS());
3350 return;
3351 }
3352
3353 Inherited::VisitBinaryOperator(E);
3354 }
3355
3356 void VisitUnaryOperator(UnaryOperator *E) {
3357 if (E->isIncrementDecrementOp()) {
3358 HandleValue(E->getSubExpr(), false /*AddressOf*/);
3359 return;
3360 }
3361 if (E->getOpcode() == UO_AddrOf) {
3362 if (MemberExpr *ME = dyn_cast<MemberExpr>(E->getSubExpr())) {
3363 HandleValue(ME->getBase(), true /*AddressOf*/);
3364 return;
3365 }
3366 }
3367
3368 Inherited::VisitUnaryOperator(E);
3369 }
3370 };
3371
3372 // Diagnose value-uses of fields to initialize themselves, e.g.
3373 // foo(foo)
3374 // where foo is not also a parameter to the constructor.
3375 // Also diagnose across field uninitialized use such as
3376 // x(y), y(x)
3377 // TODO: implement -Wuninitialized and fold this into that framework.
3378 static void DiagnoseUninitializedFields(
3379 Sema &SemaRef, const CXXConstructorDecl *Constructor) {
3380
3381 if (SemaRef.getDiagnostics().isIgnored(diag::warn_field_is_uninit,
3382 Constructor->getLocation())) {
3383 return;
3384 }
3385
3386 if (Constructor->isInvalidDecl())
3387 return;
3388
3389 const CXXRecordDecl *RD = Constructor->getParent();
3390
3391 if (RD->getDescribedClassTemplate())
3392 return;
3393
3394 // Holds fields that are uninitialized.
3395 llvm::SmallPtrSet<ValueDecl*, 4> UninitializedFields;
3396
3397 // At the beginning, all fields are uninitialized.
3398 for (auto *I : RD->decls()) {
3399 if (auto *FD = dyn_cast<FieldDecl>(I)) {
3400 UninitializedFields.insert(FD);
3401 } else if (auto *IFD = dyn_cast<IndirectFieldDecl>(I)) {
3402 UninitializedFields.insert(IFD->getAnonField());
3403 }
3404 }
3405
3406 llvm::SmallPtrSet<QualType, 4> UninitializedBaseClasses;
3407 for (auto I : RD->bases())
3408 UninitializedBaseClasses.insert(I.getType().getCanonicalType());
3409
3410 if (UninitializedFields.empty() && UninitializedBaseClasses.empty())
3411 return;
3412
3413 UninitializedFieldVisitor UninitializedChecker(SemaRef,
3414 UninitializedFields,
3415 UninitializedBaseClasses);
3416
3417 for (const auto *FieldInit : Constructor->inits()) {
3418 if (UninitializedFields.empty() && UninitializedBaseClasses.empty())
3419 break;
3420
3421 Expr *InitExpr = FieldInit->getInit();
3422 if (!InitExpr)
3423 continue;
3424
3425 if (CXXDefaultInitExpr *Default =
3426 dyn_cast<CXXDefaultInitExpr>(InitExpr)) {
3427 InitExpr = Default->getExpr();
3428 if (!InitExpr)
3429 continue;
3430 // In class initializers will point to the constructor.
3431 UninitializedChecker.CheckInitializer(InitExpr, Constructor,
3432 FieldInit->getAnyMember(),
3433 FieldInit->getBaseClass());
3434 } else {
3435 UninitializedChecker.CheckInitializer(InitExpr, nullptr,
3436 FieldInit->getAnyMember(),
3437 FieldInit->getBaseClass());
3438 }
3439 }
3440 }
3441} // namespace
3442
3443/// \brief Enter a new C++ default initializer scope. After calling this, the
3444/// caller must call \ref ActOnFinishCXXInClassMemberInitializer, even if
3445/// parsing or instantiating the initializer failed.
3446void Sema::ActOnStartCXXInClassMemberInitializer() {
3447 // Create a synthetic function scope to represent the call to the constructor
3448 // that notionally surrounds a use of this initializer.
3449 PushFunctionScope();
3450}
3451
3452/// \brief This is invoked after parsing an in-class initializer for a
3453/// non-static C++ class member, and after instantiating an in-class initializer
3454/// in a class template. Such actions are deferred until the class is complete.
3455void Sema::ActOnFinishCXXInClassMemberInitializer(Decl *D,
3456 SourceLocation InitLoc,
3457 Expr *InitExpr) {
3458 // Pop the notional constructor scope we created earlier.
3459 PopFunctionScopeInfo(nullptr, D);
3460
3461 FieldDecl *FD = dyn_cast<FieldDecl>(D);
3462 assert((isa<MSPropertyDecl>(D) || FD->getInClassInitStyle() != ICIS_NoInit) &&(((isa<MSPropertyDecl>(D) || FD->getInClassInitStyle
() != ICIS_NoInit) && "must set init style when field is created"
) ? static_cast<void> (0) : __assert_fail ("(isa<MSPropertyDecl>(D) || FD->getInClassInitStyle() != ICIS_NoInit) && \"must set init style when field is created\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 3463, __PRETTY_FUNCTION__))
3463 "must set init style when field is created")(((isa<MSPropertyDecl>(D) || FD->getInClassInitStyle
() != ICIS_NoInit) && "must set init style when field is created"
) ? static_cast<void> (0) : __assert_fail ("(isa<MSPropertyDecl>(D) || FD->getInClassInitStyle() != ICIS_NoInit) && \"must set init style when field is created\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 3463, __PRETTY_FUNCTION__))
;
3464
3465 if (!InitExpr) {
3466 D->setInvalidDecl();
3467 if (FD)
3468 FD->removeInClassInitializer();
3469 return;
3470 }
3471
3472 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) {
3473 FD->setInvalidDecl();
3474 FD->removeInClassInitializer();
3475 return;
3476 }
3477
3478 ExprResult Init = InitExpr;
3479 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) {
3480 InitializedEntity Entity = InitializedEntity::InitializeMember(FD);
3481 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit
3482 ? InitializationKind::CreateDirectList(InitExpr->getLocStart())
3483 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc);
3484 InitializationSequence Seq(*this, Entity, Kind, InitExpr);
3485 Init = Seq.Perform(*this, Entity, Kind, InitExpr);
3486 if (Init.isInvalid()) {
3487 FD->setInvalidDecl();
3488 return;
3489 }
3490 }
3491
3492 // C++11 [class.base.init]p7:
3493 // The initialization of each base and member constitutes a
3494 // full-expression.
3495 Init = ActOnFinishFullExpr(Init.get(), InitLoc);
3496 if (Init.isInvalid()) {
3497 FD->setInvalidDecl();
3498 return;
3499 }
3500
3501 InitExpr = Init.get();
3502
3503 FD->setInClassInitializer(InitExpr);
3504}
3505
3506/// \brief Find the direct and/or virtual base specifiers that
3507/// correspond to the given base type, for use in base initialization
3508/// within a constructor.
3509static bool FindBaseInitializer(Sema &SemaRef,
3510 CXXRecordDecl *ClassDecl,
3511 QualType BaseType,
3512 const CXXBaseSpecifier *&DirectBaseSpec,
3513 const CXXBaseSpecifier *&VirtualBaseSpec) {
3514 // First, check for a direct base class.
3515 DirectBaseSpec = nullptr;
3516 for (const auto &Base : ClassDecl->bases()) {
3517 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base.getType())) {
3518 // We found a direct base of this type. That's what we're
3519 // initializing.
3520 DirectBaseSpec = &Base;
3521 break;
3522 }
3523 }
3524
3525 // Check for a virtual base class.
3526 // FIXME: We might be able to short-circuit this if we know in advance that
3527 // there are no virtual bases.
3528 VirtualBaseSpec = nullptr;
3529 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) {
3530 // We haven't found a base yet; search the class hierarchy for a
3531 // virtual base class.
3532 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
3533 /*DetectVirtual=*/false);
3534 if (SemaRef.IsDerivedFrom(ClassDecl->getLocation(),
3535 SemaRef.Context.getTypeDeclType(ClassDecl),
3536 BaseType, Paths)) {
3537 for (CXXBasePaths::paths_iterator Path = Paths.begin();
3538 Path != Paths.end(); ++Path) {
3539 if (Path->back().Base->isVirtual()) {
3540 VirtualBaseSpec = Path->back().Base;
3541 break;
3542 }
3543 }
3544 }
3545 }
3546
3547 return DirectBaseSpec || VirtualBaseSpec;
3548}
3549
3550/// \brief Handle a C++ member initializer using braced-init-list syntax.
3551MemInitResult
3552Sema::ActOnMemInitializer(Decl *ConstructorD,
3553 Scope *S,
3554 CXXScopeSpec &SS,
3555 IdentifierInfo *MemberOrBase,
3556 ParsedType TemplateTypeTy,
3557 const DeclSpec &DS,
3558 SourceLocation IdLoc,
3559 Expr *InitList,
3560 SourceLocation EllipsisLoc) {
3561 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy,
3562 DS, IdLoc, InitList,
3563 EllipsisLoc);
3564}
3565
3566/// \brief Handle a C++ member initializer using parentheses syntax.
3567MemInitResult
3568Sema::ActOnMemInitializer(Decl *ConstructorD,
3569 Scope *S,
3570 CXXScopeSpec &SS,
3571 IdentifierInfo *MemberOrBase,
3572 ParsedType TemplateTypeTy,
3573 const DeclSpec &DS,
3574 SourceLocation IdLoc,
3575 SourceLocation LParenLoc,
3576 ArrayRef<Expr *> Args,
3577 SourceLocation RParenLoc,
3578 SourceLocation EllipsisLoc) {
3579 Expr *List = new (Context) ParenListExpr(Context, LParenLoc,
3580 Args, RParenLoc);
3581 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy,
3582 DS, IdLoc, List, EllipsisLoc);
3583}
3584
3585namespace {
3586
3587// Callback to only accept typo corrections that can be a valid C++ member
3588// intializer: either a non-static field member or a base class.
3589class MemInitializerValidatorCCC : public CorrectionCandidateCallback {
3590public:
3591 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl)
3592 : ClassDecl(ClassDecl) {}
3593
3594 bool ValidateCandidate(const TypoCorrection &candidate) override {
3595 if (NamedDecl *ND = candidate.getCorrectionDecl()) {
3596 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND))
3597 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl);
3598 return isa<TypeDecl>(ND);
3599 }
3600 return false;
3601 }
3602
3603private:
3604 CXXRecordDecl *ClassDecl;
3605};
3606
3607}
3608
3609/// \brief Handle a C++ member initializer.
3610MemInitResult
3611Sema::BuildMemInitializer(Decl *ConstructorD,
3612 Scope *S,
3613 CXXScopeSpec &SS,
3614 IdentifierInfo *MemberOrBase,
3615 ParsedType TemplateTypeTy,
3616 const DeclSpec &DS,
3617 SourceLocation IdLoc,
3618 Expr *Init,
3619 SourceLocation EllipsisLoc) {
3620 ExprResult Res = CorrectDelayedTyposInExpr(Init);
3621 if (!Res.isUsable())
3622 return true;
3623 Init = Res.get();
3624
3625 if (!ConstructorD)
3626 return true;
3627
3628 AdjustDeclIfTemplate(ConstructorD);
3629
3630 CXXConstructorDecl *Constructor
3631 = dyn_cast<CXXConstructorDecl>(ConstructorD);
3632 if (!Constructor) {
3633 // The user wrote a constructor initializer on a function that is
3634 // not a C++ constructor. Ignore the error for now, because we may
3635 // have more member initializers coming; we'll diagnose it just
3636 // once in ActOnMemInitializers.
3637 return true;
3638 }
3639
3640 CXXRecordDecl *ClassDecl = Constructor->getParent();
3641
3642 // C++ [class.base.init]p2:
3643 // Names in a mem-initializer-id are looked up in the scope of the
3644 // constructor's class and, if not found in that scope, are looked
3645 // up in the scope containing the constructor's definition.
3646 // [Note: if the constructor's class contains a member with the
3647 // same name as a direct or virtual base class of the class, a
3648 // mem-initializer-id naming the member or base class and composed
3649 // of a single identifier refers to the class member. A
3650 // mem-initializer-id for the hidden base class may be specified
3651 // using a qualified name. ]
3652 if (!SS.getScopeRep() && !TemplateTypeTy) {
3653 // Look for a member, first.
3654 DeclContext::lookup_result Result = ClassDecl->lookup(MemberOrBase);
3655 if (!Result.empty()) {
3656 ValueDecl *Member;
3657 if ((Member = dyn_cast<FieldDecl>(Result.front())) ||
3658 (Member = dyn_cast<IndirectFieldDecl>(Result.front()))) {
3659 if (EllipsisLoc.isValid())
3660 Diag(EllipsisLoc, diag::err_pack_expansion_member_init)
3661 << MemberOrBase
3662 << SourceRange(IdLoc, Init->getSourceRange().getEnd());
3663
3664 return BuildMemberInitializer(Member, Init, IdLoc);
3665 }
3666 }
3667 }
3668 // It didn't name a member, so see if it names a class.
3669 QualType BaseType;
3670 TypeSourceInfo *TInfo = nullptr;
3671
3672 if (TemplateTypeTy) {
3673 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo);
3674 } else if (DS.getTypeSpecType() == TST_decltype) {
3675 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc());
3676 } else {
3677 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName);
3678 LookupParsedName(R, S, &SS);
3679
3680 TypeDecl *TyD = R.getAsSingle<TypeDecl>();
3681 if (!TyD) {
3682 if (R.isAmbiguous()) return true;
3683
3684 // We don't want access-control diagnostics here.
3685 R.suppressDiagnostics();
3686
3687 if (SS.isSet() && isDependentScopeSpecifier(SS)) {
3688 bool NotUnknownSpecialization = false;
3689 DeclContext *DC = computeDeclContext(SS, false);
3690 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC))
3691 NotUnknownSpecialization = !Record->hasAnyDependentBases();
3692
3693 if (!NotUnknownSpecialization) {
3694 // When the scope specifier can refer to a member of an unknown
3695 // specialization, we take it as a type name.
3696 BaseType = CheckTypenameType(ETK_None, SourceLocation(),
3697 SS.getWithLocInContext(Context),
3698 *MemberOrBase, IdLoc);
3699 if (BaseType.isNull())
3700 return true;
3701
3702 R.clear();
3703 R.setLookupName(MemberOrBase);
3704 }
3705 }
3706
3707 // If no results were found, try to correct typos.
3708 TypoCorrection Corr;
3709 if (R.empty() && BaseType.isNull() &&
3710 (Corr = CorrectTypo(
3711 R.getLookupNameInfo(), R.getLookupKind(), S, &SS,
3712 llvm::make_unique<MemInitializerValidatorCCC>(ClassDecl),
3713 CTK_ErrorRecovery, ClassDecl))) {
3714 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) {
3715 // We have found a non-static data member with a similar
3716 // name to what was typed; complain and initialize that
3717 // member.
3718 diagnoseTypo(Corr,
3719 PDiag(diag::err_mem_init_not_member_or_class_suggest)
3720 << MemberOrBase << true);
3721 return BuildMemberInitializer(Member, Init, IdLoc);
3722 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) {
3723 const CXXBaseSpecifier *DirectBaseSpec;
3724 const CXXBaseSpecifier *VirtualBaseSpec;
3725 if (FindBaseInitializer(*this, ClassDecl,
3726 Context.getTypeDeclType(Type),
3727 DirectBaseSpec, VirtualBaseSpec)) {
3728 // We have found a direct or virtual base class with a
3729 // similar name to what was typed; complain and initialize
3730 // that base class.
3731 diagnoseTypo(Corr,
3732 PDiag(diag::err_mem_init_not_member_or_class_suggest)
3733 << MemberOrBase << false,
3734 PDiag() /*Suppress note, we provide our own.*/);
3735
3736 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec ? DirectBaseSpec
3737 : VirtualBaseSpec;
3738 Diag(BaseSpec->getLocStart(),
3739 diag::note_base_class_specified_here)
3740 << BaseSpec->getType()
3741 << BaseSpec->getSourceRange();
3742
3743 TyD = Type;
3744 }
3745 }
3746 }
3747
3748 if (!TyD && BaseType.isNull()) {
3749 Diag(IdLoc, diag::err_mem_init_not_member_or_class)
3750 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd());
3751 return true;
3752 }
3753 }
3754
3755 if (BaseType.isNull()) {
3756 BaseType = Context.getTypeDeclType(TyD);
3757 MarkAnyDeclReferenced(TyD->getLocation(), TyD, /*OdrUse=*/false);
3758 if (SS.isSet()) {
3759 BaseType = Context.getElaboratedType(ETK_None, SS.getScopeRep(),
3760 BaseType);
3761 TInfo = Context.CreateTypeSourceInfo(BaseType);
3762 ElaboratedTypeLoc TL = TInfo->getTypeLoc().castAs<ElaboratedTypeLoc>();
3763 TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(IdLoc);
3764 TL.setElaboratedKeywordLoc(SourceLocation());
3765 TL.setQualifierLoc(SS.getWithLocInContext(Context));
3766 }
3767 }
3768 }
3769
3770 if (!TInfo)
3771 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc);
3772
3773 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc);
3774}
3775
3776/// Checks a member initializer expression for cases where reference (or
3777/// pointer) members are bound to by-value parameters (or their addresses).
3778static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member,
3779 Expr *Init,
3780 SourceLocation IdLoc) {
3781 QualType MemberTy = Member->getType();
3782
3783 // We only handle pointers and references currently.
3784 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers?
3785 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType())
3786 return;
3787
3788 const bool IsPointer = MemberTy->isPointerType();
3789 if (IsPointer) {
3790 if (const UnaryOperator *Op
3791 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) {
3792 // The only case we're worried about with pointers requires taking the
3793 // address.
3794 if (Op->getOpcode() != UO_AddrOf)
3795 return;
3796
3797 Init = Op->getSubExpr();
3798 } else {
3799 // We only handle address-of expression initializers for pointers.
3800 return;
3801 }
3802 }
3803
3804 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) {
3805 // We only warn when referring to a non-reference parameter declaration.
3806 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl());
3807 if (!Parameter || Parameter->getType()->isReferenceType())
3808 return;
3809
3810 S.Diag(Init->getExprLoc(),
3811 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr
3812 : diag::warn_bind_ref_member_to_parameter)
3813 << Member << Parameter << Init->getSourceRange();
3814 } else {
3815 // Other initializers are fine.
3816 return;
3817 }
3818
3819 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here)
3820 << (unsigned)IsPointer;
3821}
3822
3823MemInitResult
3824Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init,
3825 SourceLocation IdLoc) {
3826 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member);
3827 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member);
3828 assert((DirectMember || IndirectMember) &&(((DirectMember || IndirectMember) && "Member must be a FieldDecl or IndirectFieldDecl"
) ? static_cast<void> (0) : __assert_fail ("(DirectMember || IndirectMember) && \"Member must be a FieldDecl or IndirectFieldDecl\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 3829, __PRETTY_FUNCTION__))
3829 "Member must be a FieldDecl or IndirectFieldDecl")(((DirectMember || IndirectMember) && "Member must be a FieldDecl or IndirectFieldDecl"
) ? static_cast<void> (0) : __assert_fail ("(DirectMember || IndirectMember) && \"Member must be a FieldDecl or IndirectFieldDecl\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 3829, __PRETTY_FUNCTION__))
;
3830
3831 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer))
3832 return true;
3833
3834 if (Member->isInvalidDecl())
3835 return true;
3836
3837 MultiExprArg Args;
3838 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
3839 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs());
3840 } else if (InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) {
3841 Args = MultiExprArg(InitList->getInits(), InitList->getNumInits());
3842 } else {
3843 // Template instantiation doesn't reconstruct ParenListExprs for us.
3844 Args = Init;
3845 }
3846
3847 SourceRange InitRange = Init->getSourceRange();
3848
3849 if (Member->getType()->isDependentType() || Init->isTypeDependent()) {
3850 // Can't check initialization for a member of dependent type or when
3851 // any of the arguments are type-dependent expressions.
3852 DiscardCleanupsInEvaluationContext();
3853 } else {
3854 bool InitList = false;
3855 if (isa<InitListExpr>(Init)) {
3856 InitList = true;
3857 Args = Init;
3858 }
3859
3860 // Initialize the member.
3861 InitializedEntity MemberEntity =
3862 DirectMember ? InitializedEntity::InitializeMember(DirectMember, nullptr)
3863 : InitializedEntity::InitializeMember(IndirectMember,
3864 nullptr);
3865 InitializationKind Kind =
3866 InitList ? InitializationKind::CreateDirectList(IdLoc)
3867 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(),
3868 InitRange.getEnd());
3869
3870 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args);
3871 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, Args,
3872 nullptr);
3873 if (MemberInit.isInvalid())
3874 return true;
3875
3876 CheckForDanglingReferenceOrPointer(*this, Member, MemberInit.get(), IdLoc);
3877
3878 // C++11 [class.base.init]p7:
3879 // The initialization of each base and member constitutes a
3880 // full-expression.
3881 MemberInit = ActOnFinishFullExpr(MemberInit.get(), InitRange.getBegin());
3882 if (MemberInit.isInvalid())
3883 return true;
3884
3885 Init = MemberInit.get();
3886 }
3887
3888 if (DirectMember) {
3889 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc,
3890 InitRange.getBegin(), Init,
3891 InitRange.getEnd());
3892 } else {
3893 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc,
3894 InitRange.getBegin(), Init,
3895 InitRange.getEnd());
3896 }
3897}
3898
3899MemInitResult
3900Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init,
3901 CXXRecordDecl *ClassDecl) {
3902 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin();
3903 if (!LangOpts.CPlusPlus11)
3904 return Diag(NameLoc, diag::err_delegating_ctor)
3905 << TInfo->getTypeLoc().getLocalSourceRange();
3906 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor);
3907
3908 bool InitList = true;
3909 MultiExprArg Args = Init;
3910 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
3911 InitList = false;
3912 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs());
3913 }
3914
3915 SourceRange InitRange = Init->getSourceRange();
3916 // Initialize the object.
3917 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation(
3918 QualType(ClassDecl->getTypeForDecl(), 0));
3919 InitializationKind Kind =
3920 InitList ? InitializationKind::CreateDirectList(NameLoc)
3921 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(),
3922 InitRange.getEnd());
3923 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args);
3924 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind,
3925 Args, nullptr);
3926 if (DelegationInit.isInvalid())
3927 return true;
3928
3929 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() &&((cast<CXXConstructExpr>(DelegationInit.get())->getConstructor
() && "Delegating constructor with no target?") ? static_cast
<void> (0) : __assert_fail ("cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && \"Delegating constructor with no target?\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 3930, __PRETTY_FUNCTION__))
3930 "Delegating constructor with no target?")((cast<CXXConstructExpr>(DelegationInit.get())->getConstructor
() && "Delegating constructor with no target?") ? static_cast
<void> (0) : __assert_fail ("cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && \"Delegating constructor with no target?\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 3930, __PRETTY_FUNCTION__))
;
3931
3932 // C++11 [class.base.init]p7:
3933 // The initialization of each base and member constitutes a
3934 // full-expression.
3935 DelegationInit = ActOnFinishFullExpr(DelegationInit.get(),
3936 InitRange.getBegin());
3937 if (DelegationInit.isInvalid())
3938 return true;
3939
3940 // If we are in a dependent context, template instantiation will
3941 // perform this type-checking again. Just save the arguments that we
3942 // received in a ParenListExpr.
3943 // FIXME: This isn't quite ideal, since our ASTs don't capture all
3944 // of the information that we have about the base
3945 // initializer. However, deconstructing the ASTs is a dicey process,
3946 // and this approach is far more likely to get the corner cases right.
3947 if (CurContext->isDependentContext())
3948 DelegationInit = Init;
3949
3950 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(),
3951 DelegationInit.getAs<Expr>(),
3952 InitRange.getEnd());
3953}
3954
3955MemInitResult
3956Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo,
3957 Expr *Init, CXXRecordDecl *ClassDecl,
3958 SourceLocation EllipsisLoc) {
3959 SourceLocation BaseLoc
3960 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin();
3961
3962 if (!BaseType->isDependentType() && !BaseType->isRecordType())
3963 return Diag(BaseLoc, diag::err_base_init_does_not_name_class)
3964 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange();
3965
3966 // C++ [class.base.init]p2:
3967 // [...] Unless the mem-initializer-id names a nonstatic data
3968 // member of the constructor's class or a direct or virtual base
3969 // of that class, the mem-initializer is ill-formed. A
3970 // mem-initializer-list can initialize a base class using any
3971 // name that denotes that base class type.
3972 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent();
3973
3974 SourceRange InitRange = Init->getSourceRange();
3975 if (EllipsisLoc.isValid()) {
3976 // This is a pack expansion.
3977 if (!BaseType->containsUnexpandedParameterPack()) {
3978 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs)
3979 << SourceRange(BaseLoc, InitRange.getEnd());
3980
3981 EllipsisLoc = SourceLocation();
3982 }
3983 } else {
3984 // Check for any unexpanded parameter packs.
3985 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer))
3986 return true;
3987
3988 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer))
3989 return true;
3990 }
3991
3992 // Check for direct and virtual base classes.
3993 const CXXBaseSpecifier *DirectBaseSpec = nullptr;
3994 const CXXBaseSpecifier *VirtualBaseSpec = nullptr;
3995 if (!Dependent) {
3996 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0),
3997 BaseType))
3998 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl);
3999
4000 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec,
4001 VirtualBaseSpec);
4002
4003 // C++ [base.class.init]p2:
4004 // Unless the mem-initializer-id names a nonstatic data member of the
4005 // constructor's class or a direct or virtual base of that class, the
4006 // mem-initializer is ill-formed.
4007 if (!DirectBaseSpec && !VirtualBaseSpec) {
4008 // If the class has any dependent bases, then it's possible that
4009 // one of those types will resolve to the same type as
4010 // BaseType. Therefore, just treat this as a dependent base
4011 // class initialization. FIXME: Should we try to check the
4012 // initialization anyway? It seems odd.
4013 if (ClassDecl->hasAnyDependentBases())
4014 Dependent = true;
4015 else
4016 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual)
4017 << BaseType << Context.getTypeDeclType(ClassDecl)
4018 << BaseTInfo->getTypeLoc().getLocalSourceRange();
4019 }
4020 }
4021
4022 if (Dependent) {
4023 DiscardCleanupsInEvaluationContext();
4024
4025 return new (Context) CXXCtorInitializer(Context, BaseTInfo,
4026 /*IsVirtual=*/false,
4027 InitRange.getBegin(), Init,
4028 InitRange.getEnd(), EllipsisLoc);
4029 }
4030
4031 // C++ [base.class.init]p2:
4032 // If a mem-initializer-id is ambiguous because it designates both
4033 // a direct non-virtual base class and an inherited virtual base
4034 // class, the mem-initializer is ill-formed.
4035 if (DirectBaseSpec && VirtualBaseSpec)
4036 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual)
4037 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange();
4038
4039 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec;
4040 if (!BaseSpec)
4041 BaseSpec = VirtualBaseSpec;
4042
4043 // Initialize the base.
4044 bool InitList = true;
4045 MultiExprArg Args = Init;
4046 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
4047 InitList = false;
4048 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs());
4049 }
4050
4051 InitializedEntity BaseEntity =
4052 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec);
4053 InitializationKind Kind =
4054 InitList ? InitializationKind::CreateDirectList(BaseLoc)
4055 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(),
4056 InitRange.getEnd());
4057 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args);
4058 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, Args, nullptr);
4059 if (BaseInit.isInvalid())
4060 return true;
4061
4062 // C++11 [class.base.init]p7:
4063 // The initialization of each base and member constitutes a
4064 // full-expression.
4065 BaseInit = ActOnFinishFullExpr(BaseInit.get(), InitRange.getBegin());
4066 if (BaseInit.isInvalid())
4067 return true;
4068
4069 // If we are in a dependent context, template instantiation will
4070 // perform this type-checking again. Just save the arguments that we
4071 // received in a ParenListExpr.
4072 // FIXME: This isn't quite ideal, since our ASTs don't capture all
4073 // of the information that we have about the base
4074 // initializer. However, deconstructing the ASTs is a dicey process,
4075 // and this approach is far more likely to get the corner cases right.
4076 if (CurContext->isDependentContext())
4077 BaseInit = Init;
4078
4079 return new (Context) CXXCtorInitializer(Context, BaseTInfo,
4080 BaseSpec->isVirtual(),
4081 InitRange.getBegin(),
4082 BaseInit.getAs<Expr>(),
4083 InitRange.getEnd(), EllipsisLoc);
4084}
4085
4086// Create a static_cast\<T&&>(expr).
4087static Expr *CastForMoving(Sema &SemaRef, Expr *E, QualType T = QualType()) {
4088 if (T.isNull()) T = E->getType();
4089 QualType TargetType = SemaRef.BuildReferenceType(
4090 T, /*SpelledAsLValue*/false, SourceLocation(), DeclarationName());
4091 SourceLocation ExprLoc = E->getLocStart();
4092 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo(
4093 TargetType, ExprLoc);
4094
4095 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E,
4096 SourceRange(ExprLoc, ExprLoc),
4097 E->getSourceRange()).get();
4098}
4099
4100/// ImplicitInitializerKind - How an implicit base or member initializer should
4101/// initialize its base or member.
4102enum ImplicitInitializerKind {
4103 IIK_Default,
4104 IIK_Copy,
4105 IIK_Move,
4106 IIK_Inherit
4107};
4108
4109static bool
4110BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor,
4111 ImplicitInitializerKind ImplicitInitKind,
4112 CXXBaseSpecifier *BaseSpec,
4113 bool IsInheritedVirtualBase,
4114 CXXCtorInitializer *&CXXBaseInit) {
4115 InitializedEntity InitEntity
4116 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec,
4117 IsInheritedVirtualBase);
4118
4119 ExprResult BaseInit;
4120
4121 switch (ImplicitInitKind) {
4122 case IIK_Inherit:
4123 case IIK_Default: {
4124 InitializationKind InitKind
4125 = InitializationKind::CreateDefault(Constructor->getLocation());
4126 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None);
4127 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, None);
4128 break;
4129 }
4130
4131 case IIK_Move:
4132 case IIK_Copy: {
4133 bool Moving = ImplicitInitKind == IIK_Move;
4134 ParmVarDecl *Param = Constructor->getParamDecl(0);
4135 QualType ParamType = Param->getType().getNonReferenceType();
4136
4137 Expr *CopyCtorArg =
4138 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(),
4139 SourceLocation(), Param, false,
4140 Constructor->getLocation(), ParamType,
4141 VK_LValue, nullptr);
4142
4143 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg));
4144
4145 // Cast to the base class to avoid ambiguities.
4146 QualType ArgTy =
4147 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(),
4148 ParamType.getQualifiers());
4149
4150 if (Moving) {
4151 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg);
4152 }
4153
4154 CXXCastPath BasePath;
4155 BasePath.push_back(BaseSpec);
4156 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy,
4157 CK_UncheckedDerivedToBase,
4158 Moving ? VK_XValue : VK_LValue,
4159 &BasePath).get();
4160
4161 InitializationKind InitKind
4162 = InitializationKind::CreateDirect(Constructor->getLocation(),
4163 SourceLocation(), SourceLocation());
4164 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, CopyCtorArg);
4165 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, CopyCtorArg);
4166 break;
4167 }
4168 }
4169
4170 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit);
4171 if (BaseInit.isInvalid())
4172 return true;
4173
4174 CXXBaseInit =
4175 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context,
4176 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(),
4177 SourceLocation()),
4178 BaseSpec->isVirtual(),
4179 SourceLocation(),
4180 BaseInit.getAs<Expr>(),
4181 SourceLocation(),
4182 SourceLocation());
4183
4184 return false;
4185}
4186
4187static bool RefersToRValueRef(Expr *MemRef) {
4188 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl();
4189 return Referenced->getType()->isRValueReferenceType();
4190}
4191
4192static bool
4193BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor,
4194 ImplicitInitializerKind ImplicitInitKind,
4195 FieldDecl *Field, IndirectFieldDecl *Indirect,
4196 CXXCtorInitializer *&CXXMemberInit) {
4197 if (Field->isInvalidDecl())
4198 return true;
4199
4200 SourceLocation Loc = Constructor->getLocation();
4201
4202 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) {
4203 bool Moving = ImplicitInitKind == IIK_Move;
4204 ParmVarDecl *Param = Constructor->getParamDecl(0);
4205 QualType ParamType = Param->getType().getNonReferenceType();
4206
4207 // Suppress copying zero-width bitfields.
4208 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0)
4209 return false;
4210
4211 Expr *MemberExprBase =
4212 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(),
4213 SourceLocation(), Param, false,
4214 Loc, ParamType, VK_LValue, nullptr);
4215
4216 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase));
4217
4218 if (Moving) {
4219 MemberExprBase = CastForMoving(SemaRef, MemberExprBase);
4220 }
4221
4222 // Build a reference to this field within the parameter.
4223 CXXScopeSpec SS;
4224 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc,
4225 Sema::LookupMemberName);
4226 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect)
4227 : cast<ValueDecl>(Field), AS_public);
4228 MemberLookup.resolveKind();
4229 ExprResult CtorArg
4230 = SemaRef.BuildMemberReferenceExpr(MemberExprBase,
4231 ParamType, Loc,
4232 /*IsArrow=*/false,
4233 SS,
4234 /*TemplateKWLoc=*/SourceLocation(),
4235 /*FirstQualifierInScope=*/nullptr,
4236 MemberLookup,
4237 /*TemplateArgs=*/nullptr,
4238 /*S*/nullptr);
4239 if (CtorArg.isInvalid())
4240 return true;
4241
4242 // C++11 [class.copy]p15:
4243 // - if a member m has rvalue reference type T&&, it is direct-initialized
4244 // with static_cast<T&&>(x.m);
4245 if (RefersToRValueRef(CtorArg.get())) {
4246 CtorArg = CastForMoving(SemaRef, CtorArg.get());
4247 }
4248
4249 InitializedEntity Entity =
4250 Indirect ? InitializedEntity::InitializeMember(Indirect, nullptr,
4251 /*Implicit*/ true)
4252 : InitializedEntity::InitializeMember(Field, nullptr,
4253 /*Implicit*/ true);
4254
4255 // Direct-initialize to use the copy constructor.
4256 InitializationKind InitKind =
4257 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation());
4258
4259 Expr *CtorArgE = CtorArg.getAs<Expr>();
4260 InitializationSequence InitSeq(SemaRef, Entity, InitKind, CtorArgE);
4261 ExprResult MemberInit =
4262 InitSeq.Perform(SemaRef, Entity, InitKind, MultiExprArg(&CtorArgE, 1));
4263 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit);
4264 if (MemberInit.isInvalid())
4265 return true;
4266
4267 if (Indirect)
4268 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(
4269 SemaRef.Context, Indirect, Loc, Loc, MemberInit.getAs<Expr>(), Loc);
4270 else
4271 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(
4272 SemaRef.Context, Field, Loc, Loc, MemberInit.getAs<Expr>(), Loc);
4273 return false;
4274 }
4275
4276 assert((ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit) &&(((ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit
) && "Unhandled implicit init kind!") ? static_cast<
void> (0) : __assert_fail ("(ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit) && \"Unhandled implicit init kind!\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 4277, __PRETTY_FUNCTION__))
4277 "Unhandled implicit init kind!")(((ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit
) && "Unhandled implicit init kind!") ? static_cast<
void> (0) : __assert_fail ("(ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit) && \"Unhandled implicit init kind!\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 4277, __PRETTY_FUNCTION__))
;
4278
4279 QualType FieldBaseElementType =
4280 SemaRef.Context.getBaseElementType(Field->getType());
4281
4282 if (FieldBaseElementType->isRecordType()) {
4283 InitializedEntity InitEntity =
4284 Indirect ? InitializedEntity::InitializeMember(Indirect, nullptr,
4285 /*Implicit*/ true)
4286 : InitializedEntity::InitializeMember(Field, nullptr,
4287 /*Implicit*/ true);
4288 InitializationKind InitKind =
4289 InitializationKind::CreateDefault(Loc);
4290
4291 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None);
4292 ExprResult MemberInit =
4293 InitSeq.Perform(SemaRef, InitEntity, InitKind, None);
4294
4295 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit);
4296 if (MemberInit.isInvalid())
4297 return true;
4298
4299 if (Indirect)
4300 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context,
4301 Indirect, Loc,
4302 Loc,
4303 MemberInit.get(),
4304 Loc);
4305 else
4306 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context,
4307 Field, Loc, Loc,
4308 MemberInit.get(),
4309 Loc);
4310 return false;
4311 }
4312
4313 if (!Field->getParent()->isUnion()) {
4314 if (FieldBaseElementType->isReferenceType()) {
4315 SemaRef.Diag(Constructor->getLocation(),
4316 diag::err_uninitialized_member_in_ctor)
4317 << (int)Constructor->isImplicit()
4318 << SemaRef.Context.getTagDeclType(Constructor->getParent())
4319 << 0 << Field->getDeclName();
4320 SemaRef.Diag(Field->getLocation(), diag::note_declared_at);
4321 return true;
4322 }
4323
4324 if (FieldBaseElementType.isConstQualified()) {
4325 SemaRef.Diag(Constructor->getLocation(),
4326 diag::err_uninitialized_member_in_ctor)
4327 << (int)Constructor->isImplicit()
4328 << SemaRef.Context.getTagDeclType(Constructor->getParent())
4329 << 1 << Field->getDeclName();
4330 SemaRef.Diag(Field->getLocation(), diag::note_declared_at);
4331 return true;
4332 }
4333 }
4334
4335 if (SemaRef.getLangOpts().ObjCAutoRefCount &&
4336 FieldBaseElementType->isObjCRetainableType() &&
4337 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None &&
4338 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) {
4339 // ARC:
4340 // Default-initialize Objective-C pointers to NULL.
4341 CXXMemberInit
4342 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field,
4343 Loc, Loc,
4344 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()),
4345 Loc);
4346 return false;
4347 }
4348
4349 // Nothing to initialize.
4350 CXXMemberInit = nullptr;
4351 return false;
4352}
4353
4354namespace {
4355struct BaseAndFieldInfo {
4356 Sema &S;
4357 CXXConstructorDecl *Ctor;
4358 bool AnyErrorsInInits;
4359 ImplicitInitializerKind IIK;
4360 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields;
4361 SmallVector<CXXCtorInitializer*, 8> AllToInit;
4362 llvm::DenseMap<TagDecl*, FieldDecl*> ActiveUnionMember;
4363
4364 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits)
4365 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) {
4366 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted();
4367 if (Ctor->getInheritedConstructor())
4368 IIK = IIK_Inherit;
4369 else if (Generated && Ctor->isCopyConstructor())
4370 IIK = IIK_Copy;
4371 else if (Generated && Ctor->isMoveConstructor())
4372 IIK = IIK_Move;
4373 else
4374 IIK = IIK_Default;
4375 }
4376
4377 bool isImplicitCopyOrMove() const {
4378 switch (IIK) {
4379 case IIK_Copy:
4380 case IIK_Move:
4381 return true;
4382
4383 case IIK_Default:
4384 case IIK_Inherit:
4385 return false;
4386 }
4387
4388 llvm_unreachable("Invalid ImplicitInitializerKind!")::llvm::llvm_unreachable_internal("Invalid ImplicitInitializerKind!"
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 4388)
;
4389 }
4390
4391 bool addFieldInitializer(CXXCtorInitializer *Init) {
4392 AllToInit.push_back(Init);
4393
4394 // Check whether this initializer makes the field "used".
4395 if (Init->getInit()->HasSideEffects(S.Context))
4396 S.UnusedPrivateFields.remove(Init->getAnyMember());
4397
4398 return false;
4399 }
4400
4401 bool isInactiveUnionMember(FieldDecl *Field) {
4402 RecordDecl *Record = Field->getParent();
4403 if (!Record->isUnion())
4404 return false;
4405
4406 if (FieldDecl *Active =
4407 ActiveUnionMember.lookup(Record->getCanonicalDecl()))
4408 return Active != Field->getCanonicalDecl();
4409
4410 // In an implicit copy or move constructor, ignore any in-class initializer.
4411 if (isImplicitCopyOrMove())
4412 return true;
4413
4414 // If there's no explicit initialization, the field is active only if it
4415 // has an in-class initializer...
4416 if (Field->hasInClassInitializer())
4417 return false;
4418 // ... or it's an anonymous struct or union whose class has an in-class
4419 // initializer.
4420 if (!Field->isAnonymousStructOrUnion())
4421 return true;
4422 CXXRecordDecl *FieldRD = Field->getType()->getAsCXXRecordDecl();
4423 return !FieldRD->hasInClassInitializer();
4424 }
4425
4426 /// \brief Determine whether the given field is, or is within, a union member
4427 /// that is inactive (because there was an initializer given for a different
4428 /// member of the union, or because the union was not initialized at all).
4429 bool isWithinInactiveUnionMember(FieldDecl *Field,
4430 IndirectFieldDecl *Indirect) {
4431 if (!Indirect)
4432 return isInactiveUnionMember(Field);
4433
4434 for (auto *C : Indirect->chain()) {
4435 FieldDecl *Field = dyn_cast<FieldDecl>(C);
4436 if (Field && isInactiveUnionMember(Field))
4437 return true;
4438 }
4439 return false;
4440 }
4441};
4442}
4443
4444/// \brief Determine whether the given type is an incomplete or zero-lenfgth
4445/// array type.
4446static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) {
4447 if (T->isIncompleteArrayType())
4448 return true;
4449
4450 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) {
4451 if (!ArrayT->getSize())
4452 return true;
4453
4454 T = ArrayT->getElementType();
4455 }
4456
4457 return false;
4458}
4459
4460static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info,
4461 FieldDecl *Field,
4462 IndirectFieldDecl *Indirect = nullptr) {
4463 if (Field->isInvalidDecl())
4464 return false;
4465
4466 // Overwhelmingly common case: we have a direct initializer for this field.
4467 if (CXXCtorInitializer *Init =
4468 Info.AllBaseFields.lookup(Field->getCanonicalDecl()))
4469 return Info.addFieldInitializer(Init);
4470
4471 // C++11 [class.base.init]p8:
4472 // if the entity is a non-static data member that has a
4473 // brace-or-equal-initializer and either
4474 // -- the constructor's class is a union and no other variant member of that
4475 // union is designated by a mem-initializer-id or
4476 // -- the constructor's class is not a union, and, if the entity is a member
4477 // of an anonymous union, no other member of that union is designated by
4478 // a mem-initializer-id,
4479 // the entity is initialized as specified in [dcl.init].
4480 //
4481 // We also apply the same rules to handle anonymous structs within anonymous
4482 // unions.
4483 if (Info.isWithinInactiveUnionMember(Field, Indirect))
4484 return false;
4485
4486 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) {
4487 ExprResult DIE =
4488 SemaRef.BuildCXXDefaultInitExpr(Info.Ctor->getLocation(), Field);
4489 if (DIE.isInvalid())
4490 return true;
4491 CXXCtorInitializer *Init;
4492 if (Indirect)
4493 Init = new (SemaRef.Context)
4494 CXXCtorInitializer(SemaRef.Context, Indirect, SourceLocation(),
4495 SourceLocation(), DIE.get(), SourceLocation());
4496 else
4497 Init = new (SemaRef.Context)
4498 CXXCtorInitializer(SemaRef.Context, Field, SourceLocation(),
4499 SourceLocation(), DIE.get(), SourceLocation());
4500 return Info.addFieldInitializer(Init);
4501 }
4502
4503 // Don't initialize incomplete or zero-length arrays.
4504 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType()))
4505 return false;
4506
4507 // Don't try to build an implicit initializer if there were semantic
4508 // errors in any of the initializers (and therefore we might be
4509 // missing some that the user actually wrote).
4510 if (Info.AnyErrorsInInits)
4511 return false;
4512
4513 CXXCtorInitializer *Init = nullptr;
4514 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field,
4515 Indirect, Init))
4516 return true;
4517
4518 if (!Init)
4519 return false;
4520
4521 return Info.addFieldInitializer(Init);
4522}
4523
4524bool
4525Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor,
4526 CXXCtorInitializer *Initializer) {
4527 assert(Initializer->isDelegatingInitializer())((Initializer->isDelegatingInitializer()) ? static_cast<
void> (0) : __assert_fail ("Initializer->isDelegatingInitializer()"
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 4527, __PRETTY_FUNCTION__))
;
4528 Constructor->setNumCtorInitializers(1);
4529 CXXCtorInitializer **initializer =
4530 new (Context) CXXCtorInitializer*[1];
4531 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*));
4532 Constructor->setCtorInitializers(initializer);
4533
4534 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) {
4535 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor);
4536 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation());
4537 }
4538
4539 DelegatingCtorDecls.push_back(Constructor);
4540
4541 DiagnoseUninitializedFields(*this, Constructor);
4542
4543 return false;
4544}
4545
4546bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, bool AnyErrors,
4547 ArrayRef<CXXCtorInitializer *> Initializers) {
4548 if (Constructor->isDependentContext()) {
4549 // Just store the initializers as written, they will be checked during
4550 // instantiation.
4551 if (!Initializers.empty()) {
4552 Constructor->setNumCtorInitializers(Initializers.size());
4553 CXXCtorInitializer **baseOrMemberInitializers =
4554 new (Context) CXXCtorInitializer*[Initializers.size()];
4555 memcpy(baseOrMemberInitializers, Initializers.data(),
4556 Initializers.size() * sizeof(CXXCtorInitializer*));
4557 Constructor->setCtorInitializers(baseOrMemberInitializers);
4558 }
4559
4560 // Let template instantiation know whether we had errors.
4561 if (AnyErrors)
4562 Constructor->setInvalidDecl();
4563
4564 return false;
4565 }
4566
4567 BaseAndFieldInfo Info(*this, Constructor, AnyErrors);
4568
4569 // We need to build the initializer AST according to order of construction
4570 // and not what user specified in the Initializers list.
4571 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition();
4572 if (!ClassDecl)
4573 return true;
4574
4575 bool HadError = false;
4576
4577 for (unsigned i = 0; i < Initializers.size(); i++) {
4578 CXXCtorInitializer *Member = Initializers[i];
4579
4580 if (Member->isBaseInitializer())
4581 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member;
4582 else {
4583 Info.AllBaseFields[Member->getAnyMember()->getCanonicalDecl()] = Member;
4584
4585 if (IndirectFieldDecl *F = Member->getIndirectMember()) {
4586 for (auto *C : F->chain()) {
4587 FieldDecl *FD = dyn_cast<FieldDecl>(C);
4588 if (FD && FD->getParent()->isUnion())
4589 Info.ActiveUnionMember.insert(std::make_pair(
4590 FD->getParent()->getCanonicalDecl(), FD->getCanonicalDecl()));
4591 }
4592 } else if (FieldDecl *FD = Member->getMember()) {
4593 if (FD->getParent()->isUnion())
4594 Info.ActiveUnionMember.insert(std::make_pair(
4595 FD->getParent()->getCanonicalDecl(), FD->getCanonicalDecl()));
4596 }
4597 }
4598 }
4599
4600 // Keep track of the direct virtual bases.
4601 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases;
4602 for (auto &I : ClassDecl->bases()) {
4603 if (I.isVirtual())
4604 DirectVBases.insert(&I);
4605 }
4606
4607 // Push virtual bases before others.
4608 for (auto &VBase : ClassDecl->vbases()) {
4609 if (CXXCtorInitializer *Value
4610 = Info.AllBaseFields.lookup(VBase.getType()->getAs<RecordType>())) {
4611 // [class.base.init]p7, per DR257:
4612 // A mem-initializer where the mem-initializer-id names a virtual base
4613 // class is ignored during execution of a constructor of any class that
4614 // is not the most derived class.
4615 if (ClassDecl->isAbstract()) {
4616 // FIXME: Provide a fixit to remove the base specifier. This requires
4617 // tracking the location of the associated comma for a base specifier.
4618 Diag(Value->getSourceLocation(), diag::warn_abstract_vbase_init_ignored)
4619 << VBase.getType() << ClassDecl;
4620 DiagnoseAbstractType(ClassDecl);
4621 }
4622
4623 Info.AllToInit.push_back(Value);
4624 } else if (!AnyErrors && !ClassDecl->isAbstract()) {
4625 // [class.base.init]p8, per DR257:
4626 // If a given [...] base class is not named by a mem-initializer-id
4627 // [...] and the entity is not a virtual base class of an abstract
4628 // class, then [...] the entity is default-initialized.
4629 bool IsInheritedVirtualBase = !DirectVBases.count(&VBase);
4630 CXXCtorInitializer *CXXBaseInit;
4631 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK,
4632 &VBase, IsInheritedVirtualBase,
4633 CXXBaseInit)) {
4634 HadError = true;
4635 continue;
4636 }
4637
4638 Info.AllToInit.push_back(CXXBaseInit);
4639 }
4640 }
4641
4642 // Non-virtual bases.
4643 for (auto &Base : ClassDecl->bases()) {
4644 // Virtuals are in the virtual base list and already constructed.
4645 if (Base.isVirtual())
4646 continue;
4647
4648 if (CXXCtorInitializer *Value
4649 = Info.AllBaseFields.lookup(Base.getType()->getAs<RecordType>())) {
4650 Info.AllToInit.push_back(Value);
4651 } else if (!AnyErrors) {
4652 CXXCtorInitializer *CXXBaseInit;
4653 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK,
4654 &Base, /*IsInheritedVirtualBase=*/false,
4655 CXXBaseInit)) {
4656 HadError = true;
4657 continue;
4658 }
4659
4660 Info.AllToInit.push_back(CXXBaseInit);
4661 }
4662 }
4663
4664 // Fields.
4665 for (auto *Mem : ClassDecl->decls()) {
4666 if (auto *F = dyn_cast<FieldDecl>(Mem)) {
4667 // C++ [class.bit]p2:
4668 // A declaration for a bit-field that omits the identifier declares an
4669 // unnamed bit-field. Unnamed bit-fields are not members and cannot be
4670 // initialized.
4671 if (F->isUnnamedBitfield())
4672 continue;
4673
4674 // If we're not generating the implicit copy/move constructor, then we'll
4675 // handle anonymous struct/union fields based on their individual
4676 // indirect fields.
4677 if (F->isAnonymousStructOrUnion() && !Info.isImplicitCopyOrMove())
4678 continue;
4679
4680 if (CollectFieldInitializer(*this, Info, F))
4681 HadError = true;
4682 continue;
4683 }
4684
4685 // Beyond this point, we only consider default initialization.
4686 if (Info.isImplicitCopyOrMove())
4687 continue;
4688
4689 if (auto *F = dyn_cast<IndirectFieldDecl>(Mem)) {
4690 if (F->getType()->isIncompleteArrayType()) {
4691 assert(ClassDecl->hasFlexibleArrayMember() &&((ClassDecl->hasFlexibleArrayMember() && "Incomplete array type is not valid"
) ? static_cast<void> (0) : __assert_fail ("ClassDecl->hasFlexibleArrayMember() && \"Incomplete array type is not valid\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 4692, __PRETTY_FUNCTION__))
4692 "Incomplete array type is not valid")((ClassDecl->hasFlexibleArrayMember() && "Incomplete array type is not valid"
) ? static_cast<void> (0) : __assert_fail ("ClassDecl->hasFlexibleArrayMember() && \"Incomplete array type is not valid\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 4692, __PRETTY_FUNCTION__))
;
4693 continue;
4694 }
4695
4696 // Initialize each field of an anonymous struct individually.
4697 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F))
4698 HadError = true;
4699
4700 continue;
4701 }
4702 }
4703
4704 unsigned NumInitializers = Info.AllToInit.size();
4705 if (NumInitializers > 0) {
4706 Constructor->setNumCtorInitializers(NumInitializers);
4707 CXXCtorInitializer **baseOrMemberInitializers =
4708 new (Context) CXXCtorInitializer*[NumInitializers];
4709 memcpy(baseOrMemberInitializers, Info.AllToInit.data(),
4710 NumInitializers * sizeof(CXXCtorInitializer*));
4711 Constructor->setCtorInitializers(baseOrMemberInitializers);
4712
4713 // Constructors implicitly reference the base and member
4714 // destructors.
4715 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(),
4716 Constructor->getParent());
4717 }
4718
4719 return HadError;
4720}
4721
4722static void PopulateKeysForFields(FieldDecl *Field, SmallVectorImpl<const void*> &IdealInits) {
4723 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) {
4724 const RecordDecl *RD = RT->getDecl();
4725 if (RD->isAnonymousStructOrUnion()) {
4726 for (auto *Field : RD->fields())
4727 PopulateKeysForFields(Field, IdealInits);
4728 return;
4729 }
4730 }
4731 IdealInits.push_back(Field->getCanonicalDecl());
4732}
4733
4734static const void *GetKeyForBase(ASTContext &Context, QualType BaseType) {
4735 return Context.getCanonicalType(BaseType).getTypePtr();
4736}
4737
4738static const void *GetKeyForMember(ASTContext &Context,
4739 CXXCtorInitializer *Member) {
4740 if (!Member->isAnyMemberInitializer())
4741 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0));
4742
4743 return Member->getAnyMember()->getCanonicalDecl();
4744}
4745
4746static void DiagnoseBaseOrMemInitializerOrder(
4747 Sema &SemaRef, const CXXConstructorDecl *Constructor,
4748 ArrayRef<CXXCtorInitializer *> Inits) {
4749 if (Constructor->getDeclContext()->isDependentContext())
4750 return;
4751
4752 // Don't check initializers order unless the warning is enabled at the
4753 // location of at least one initializer.
4754 bool ShouldCheckOrder = false;
4755 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) {
4756 CXXCtorInitializer *Init = Inits[InitIndex];
4757 if (!SemaRef.Diags.isIgnored(diag::warn_initializer_out_of_order,
4758 Init->getSourceLocation())) {
4759 ShouldCheckOrder = true;
4760 break;
4761 }
4762 }
4763 if (!ShouldCheckOrder)
4764 return;
4765
4766 // Build the list of bases and members in the order that they'll
4767 // actually be initialized. The explicit initializers should be in
4768 // this same order but may be missing things.
4769 SmallVector<const void*, 32> IdealInitKeys;
4770
4771 const CXXRecordDecl *ClassDecl = Constructor->getParent();
4772
4773 // 1. Virtual bases.
4774 for (const auto &VBase : ClassDecl->vbases())
4775 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase.getType()));
4776
4777 // 2. Non-virtual bases.
4778 for (const auto &Base : ClassDecl->bases()) {
4779 if (Base.isVirtual())
4780 continue;
4781 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base.getType()));
4782 }
4783
4784 // 3. Direct fields.
4785 for (auto *Field : ClassDecl->fields()) {
4786 if (Field->isUnnamedBitfield())
4787 continue;
4788
4789 PopulateKeysForFields(Field, IdealInitKeys);
4790 }
4791
4792 unsigned NumIdealInits = IdealInitKeys.size();
4793 unsigned IdealIndex = 0;
4794
4795 CXXCtorInitializer *PrevInit = nullptr;
4796 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) {
4797 CXXCtorInitializer *Init = Inits[InitIndex];
4798 const void *InitKey = GetKeyForMember(SemaRef.Context, Init);
4799
4800 // Scan forward to try to find this initializer in the idealized
4801 // initializers list.
4802 for (; IdealIndex != NumIdealInits; ++IdealIndex)
4803 if (InitKey == IdealInitKeys[IdealIndex])
4804 break;
4805
4806 // If we didn't find this initializer, it must be because we
4807 // scanned past it on a previous iteration. That can only
4808 // happen if we're out of order; emit a warning.
4809 if (IdealIndex == NumIdealInits && PrevInit) {
4810 Sema::SemaDiagnosticBuilder D =
4811 SemaRef.Diag(PrevInit->getSourceLocation(),
4812 diag::warn_initializer_out_of_order);
4813
4814 if (PrevInit->isAnyMemberInitializer())
4815 D << 0 << PrevInit->getAnyMember()->getDeclName();
4816 else
4817 D << 1 << PrevInit->getTypeSourceInfo()->getType();
4818
4819 if (Init->isAnyMemberInitializer())
4820 D << 0 << Init->getAnyMember()->getDeclName();
4821 else
4822 D << 1 << Init->getTypeSourceInfo()->getType();
4823
4824 // Move back to the initializer's location in the ideal list.
4825 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex)
4826 if (InitKey == IdealInitKeys[IdealIndex])
4827 break;
4828
4829 assert(IdealIndex < NumIdealInits &&((IdealIndex < NumIdealInits && "initializer not found in initializer list"
) ? static_cast<void> (0) : __assert_fail ("IdealIndex < NumIdealInits && \"initializer not found in initializer list\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 4830, __PRETTY_FUNCTION__))
4830 "initializer not found in initializer list")((IdealIndex < NumIdealInits && "initializer not found in initializer list"
) ? static_cast<void> (0) : __assert_fail ("IdealIndex < NumIdealInits && \"initializer not found in initializer list\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 4830, __PRETTY_FUNCTION__))
;
4831 }
4832
4833 PrevInit = Init;
4834 }
4835}
4836
4837namespace {
4838bool CheckRedundantInit(Sema &S,
4839 CXXCtorInitializer *Init,
4840 CXXCtorInitializer *&PrevInit) {
4841 if (!PrevInit) {
4842 PrevInit = Init;
4843 return false;
4844 }
4845
4846 if (FieldDecl *Field = Init->getAnyMember())
4847 S.Diag(Init->getSourceLocation(),
4848 diag::err_multiple_mem_initialization)
4849 << Field->getDeclName()
4850 << Init->getSourceRange();
4851 else {
4852 const Type *BaseClass = Init->getBaseClass();
4853 assert(BaseClass && "neither field nor base")((BaseClass && "neither field nor base") ? static_cast
<void> (0) : __assert_fail ("BaseClass && \"neither field nor base\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 4853, __PRETTY_FUNCTION__))
;
4854 S.Diag(Init->getSourceLocation(),
4855 diag::err_multiple_base_initialization)
4856 << QualType(BaseClass, 0)
4857 << Init->getSourceRange();
4858 }
4859 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer)
4860 << 0 << PrevInit->getSourceRange();
4861
4862 return true;
4863}
4864
4865typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry;
4866typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap;
4867
4868bool CheckRedundantUnionInit(Sema &S,
4869 CXXCtorInitializer *Init,
4870 RedundantUnionMap &Unions) {
4871 FieldDecl *Field = Init->getAnyMember();
4872 RecordDecl *Parent = Field->getParent();
4873 NamedDecl *Child = Field;
4874
4875 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) {
4876 if (Parent->isUnion()) {
4877 UnionEntry &En = Unions[Parent];
4878 if (En.first && En.first != Child) {
4879 S.Diag(Init->getSourceLocation(),
4880 diag::err_multiple_mem_union_initialization)
4881 << Field->getDeclName()
4882 << Init->getSourceRange();
4883 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer)
4884 << 0 << En.second->getSourceRange();
4885 return true;
4886 }
4887 if (!En.first) {
4888 En.first = Child;
4889 En.second = Init;
4890 }
4891 if (!Parent->isAnonymousStructOrUnion())
4892 return false;
4893 }
4894
4895 Child = Parent;
4896 Parent = cast<RecordDecl>(Parent->getDeclContext());
4897 }
4898
4899 return false;
4900}
4901}
4902
4903/// ActOnMemInitializers - Handle the member initializers for a constructor.
4904void Sema::ActOnMemInitializers(Decl *ConstructorDecl,
4905 SourceLocation ColonLoc,
4906 ArrayRef<CXXCtorInitializer*> MemInits,
4907 bool AnyErrors) {
4908 if (!ConstructorDecl)
4909 return;
4910
4911 AdjustDeclIfTemplate(ConstructorDecl);
4912
4913 CXXConstructorDecl *Constructor
4914 = dyn_cast<CXXConstructorDecl>(ConstructorDecl);
4915
4916 if (!Constructor) {
4917 Diag(ColonLoc, diag::err_only_constructors_take_base_inits);
4918 return;
4919 }
4920
4921 // Mapping for the duplicate initializers check.
4922 // For member initializers, this is keyed with a FieldDecl*.
4923 // For base initializers, this is keyed with a Type*.
4924 llvm::DenseMap<const void *, CXXCtorInitializer *> Members;
4925
4926 // Mapping for the inconsistent anonymous-union initializers check.
4927 RedundantUnionMap MemberUnions;
4928
4929 bool HadError = false;
4930 for (unsigned i = 0; i < MemInits.size(); i++) {
4931 CXXCtorInitializer *Init = MemInits[i];
4932
4933 // Set the source order index.
4934 Init->setSourceOrder(i);
4935
4936 if (Init->isAnyMemberInitializer()) {
4937 const void *Key = GetKeyForMember(Context, Init);
4938 if (CheckRedundantInit(*this, Init, Members[Key]) ||
4939 CheckRedundantUnionInit(*this, Init, MemberUnions))
4940 HadError = true;
4941 } else if (Init->isBaseInitializer()) {
4942 const void *Key = GetKeyForMember(Context, Init);
4943 if (CheckRedundantInit(*this, Init, Members[Key]))
4944 HadError = true;
4945 } else {
4946 assert(Init->isDelegatingInitializer())((Init->isDelegatingInitializer()) ? static_cast<void>
(0) : __assert_fail ("Init->isDelegatingInitializer()", "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 4946, __PRETTY_FUNCTION__))
;
4947 // This must be the only initializer
4948 if (MemInits.size() != 1) {
4949 Diag(Init->getSourceLocation(),
4950 diag::err_delegating_initializer_alone)
4951 << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange();
4952 // We will treat this as being the only initializer.
4953 }
4954 SetDelegatingInitializer(Constructor, MemInits[i]);
4955 // Return immediately as the initializer is set.
4956 return;
4957 }
4958 }
4959
4960 if (HadError)
4961 return;
4962
4963 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits);
4964
4965 SetCtorInitializers(Constructor, AnyErrors, MemInits);
4966
4967 DiagnoseUninitializedFields(*this, Constructor);
4968}
4969
4970void
4971Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location,
4972 CXXRecordDecl *ClassDecl) {
4973 // Ignore dependent contexts. Also ignore unions, since their members never
4974 // have destructors implicitly called.
4975 if (ClassDecl->isDependentContext() || ClassDecl->isUnion())
4976 return;
4977
4978 // FIXME: all the access-control diagnostics are positioned on the
4979 // field/base declaration. That's probably good; that said, the
4980 // user might reasonably want to know why the destructor is being
4981 // emitted, and we currently don't say.
4982
4983 // Non-static data members.
4984 for (auto *Field : ClassDecl->fields()) {
4985 if (Field->isInvalidDecl())
4986 continue;
4987
4988 // Don't destroy incomplete or zero-length arrays.
4989 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType()))
4990 continue;
4991
4992 QualType FieldType = Context.getBaseElementType(Field->getType());
4993
4994 const RecordType* RT = FieldType->getAs<RecordType>();
4995 if (!RT)
4996 continue;
4997
4998 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl());
4999 if (FieldClassDecl->isInvalidDecl())
5000 continue;
5001 if (FieldClassDecl->hasIrrelevantDestructor())
5002 continue;
5003 // The destructor for an implicit anonymous union member is never invoked.
5004 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion())
5005 continue;
5006
5007 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl);
5008 assert(Dtor && "No dtor found for FieldClassDecl!")((Dtor && "No dtor found for FieldClassDecl!") ? static_cast
<void> (0) : __assert_fail ("Dtor && \"No dtor found for FieldClassDecl!\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 5008, __PRETTY_FUNCTION__))
;
5009 CheckDestructorAccess(Field->getLocation(), Dtor,
5010 PDiag(diag::err_access_dtor_field)
5011 << Field->getDeclName()
5012 << FieldType);
5013
5014 MarkFunctionReferenced(Location, Dtor);
5015 DiagnoseUseOfDecl(Dtor, Location);
5016 }
5017
5018 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases;
5019
5020 // Bases.
5021 for (const auto &Base : ClassDecl->bases()) {
5022 // Bases are always records in a well-formed non-dependent class.
5023 const RecordType *RT = Base.getType()->getAs<RecordType>();
5024
5025 // Remember direct virtual bases.
5026 if (Base.isVirtual())
5027 DirectVirtualBases.insert(RT);
5028
5029 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl());
5030 // If our base class is invalid, we probably can't get its dtor anyway.
5031 if (BaseClassDecl->isInvalidDecl())
5032 continue;
5033 if (BaseClassDecl->hasIrrelevantDestructor())
5034 continue;
5035
5036 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl);
5037 assert(Dtor && "No dtor found for BaseClassDecl!")((Dtor && "No dtor found for BaseClassDecl!") ? static_cast
<void> (0) : __assert_fail ("Dtor && \"No dtor found for BaseClassDecl!\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 5037, __PRETTY_FUNCTION__))
;
5038
5039 // FIXME: caret should be on the start of the class name
5040 CheckDestructorAccess(Base.getLocStart(), Dtor,
5041 PDiag(diag::err_access_dtor_base)
5042 << Base.getType()
5043 << Base.getSourceRange(),
5044 Context.getTypeDeclType(ClassDecl));
5045
5046 MarkFunctionReferenced(Location, Dtor);
5047 DiagnoseUseOfDecl(Dtor, Location);
5048 }
5049
5050 // Virtual bases.
5051 for (const auto &VBase : ClassDecl->vbases()) {
5052 // Bases are always records in a well-formed non-dependent class.
5053 const RecordType *RT = VBase.getType()->castAs<RecordType>();
5054
5055 // Ignore direct virtual bases.
5056 if (DirectVirtualBases.count(RT))
5057 continue;
5058
5059 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl());
5060 // If our base class is invalid, we probably can't get its dtor anyway.
5061 if (BaseClassDecl->isInvalidDecl())
5062 continue;
5063 if (BaseClassDecl->hasIrrelevantDestructor())
5064 continue;
5065
5066 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl);
5067 assert(Dtor && "No dtor found for BaseClassDecl!")((Dtor && "No dtor found for BaseClassDecl!") ? static_cast
<void> (0) : __assert_fail ("Dtor && \"No dtor found for BaseClassDecl!\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 5067, __PRETTY_FUNCTION__))
;
5068 if (CheckDestructorAccess(
5069 ClassDecl->getLocation(), Dtor,
5070 PDiag(diag::err_access_dtor_vbase)
5071 << Context.getTypeDeclType(ClassDecl) << VBase.getType(),
5072 Context.getTypeDeclType(ClassDecl)) ==
5073 AR_accessible) {
5074 CheckDerivedToBaseConversion(
5075 Context.getTypeDeclType(ClassDecl), VBase.getType(),
5076 diag::err_access_dtor_vbase, 0, ClassDecl->getLocation(),
5077 SourceRange(), DeclarationName(), nullptr);
5078 }
5079
5080 MarkFunctionReferenced(Location, Dtor);
5081 DiagnoseUseOfDecl(Dtor, Location);
5082 }
5083}
5084
5085void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) {
5086 if (!CDtorDecl)
5087 return;
5088
5089 if (CXXConstructorDecl *Constructor
5090 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) {
5091 SetCtorInitializers(Constructor, /*AnyErrors=*/false);
5092 DiagnoseUninitializedFields(*this, Constructor);
5093 }
5094}
5095
5096bool Sema::isAbstractType(SourceLocation Loc, QualType T) {
5097 if (!getLangOpts().CPlusPlus)
5098 return false;
5099
5100 const auto *RD = Context.getBaseElementType(T)->getAsCXXRecordDecl();
5101 if (!RD)
5102 return false;
5103
5104 // FIXME: Per [temp.inst]p1, we are supposed to trigger instantiation of a
5105 // class template specialization here, but doing so breaks a lot of code.
5106
5107 // We can't answer whether something is abstract until it has a
5108 // definition. If it's currently being defined, we'll walk back
5109 // over all the declarations when we have a full definition.
5110 const CXXRecordDecl *Def = RD->getDefinition();
5111 if (!Def || Def->isBeingDefined())
5112 return false;
5113
5114 return RD->isAbstract();
5115}
5116
5117bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T,
5118 TypeDiagnoser &Diagnoser) {
5119 if (!isAbstractType(Loc, T))
5120 return false;
5121
5122 T = Context.getBaseElementType(T);
5123 Diagnoser.diagnose(*this, Loc, T);
5124 DiagnoseAbstractType(T->getAsCXXRecordDecl());
5125 return true;
5126}
5127
5128void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) {
5129 // Check if we've already emitted the list of pure virtual functions
5130 // for this class.
5131 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD))
5132 return;
5133
5134 // If the diagnostic is suppressed, don't emit the notes. We're only
5135 // going to emit them once, so try to attach them to a diagnostic we're
5136 // actually going to show.
5137 if (Diags.isLastDiagnosticIgnored())
5138 return;
5139
5140 CXXFinalOverriderMap FinalOverriders;
5141 RD->getFinalOverriders(FinalOverriders);
5142
5143 // Keep a set of seen pure methods so we won't diagnose the same method
5144 // more than once.
5145 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods;
5146
5147 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(),
5148 MEnd = FinalOverriders.end();
5149 M != MEnd;
5150 ++M) {
5151 for (OverridingMethods::iterator SO = M->second.begin(),
5152 SOEnd = M->second.end();
5153 SO != SOEnd; ++SO) {
5154 // C++ [class.abstract]p4:
5155 // A class is abstract if it contains or inherits at least one
5156 // pure virtual function for which the final overrider is pure
5157 // virtual.
5158
5159 //
5160 if (SO->second.size() != 1)
5161 continue;
5162
5163 if (!SO->second.front().Method->isPure())
5164 continue;
5165
5166 if (!SeenPureMethods.insert(SO->second.front().Method).second)
5167 continue;
5168
5169 Diag(SO->second.front().Method->getLocation(),
5170 diag::note_pure_virtual_function)
5171 << SO->second.front().Method->getDeclName() << RD->getDeclName();
5172 }
5173 }
5174
5175 if (!PureVirtualClassDiagSet)
5176 PureVirtualClassDiagSet.reset(new RecordDeclSetTy);
5177 PureVirtualClassDiagSet->insert(RD);
5178}
5179
5180namespace {
5181struct AbstractUsageInfo {
5182 Sema &S;
5183 CXXRecordDecl *Record;
5184 CanQualType AbstractType;
5185 bool Invalid;
5186
5187 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record)
5188 : S(S), Record(Record),
5189 AbstractType(S.Context.getCanonicalType(
5190 S.Context.getTypeDeclType(Record))),
5191 Invalid(false) {}
5192
5193 void DiagnoseAbstractType() {
5194 if (Invalid) return;
5195 S.DiagnoseAbstractType(Record);
5196 Invalid = true;
5197 }
5198
5199 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel);
5200};
5201
5202struct CheckAbstractUsage {
5203 AbstractUsageInfo &Info;
5204 const NamedDecl *Ctx;
5205
5206 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx)
5207 : Info(Info), Ctx(Ctx) {}
5208
5209 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) {
5210 switch (TL.getTypeLocClass()) {
5211#define ABSTRACT_TYPELOC(CLASS, PARENT)
5212#define TYPELOC(CLASS, PARENT) \
5213 case TypeLoc::CLASS: Check(TL.castAs<CLASS##TypeLoc>(), Sel); break;
5214#include "clang/AST/TypeLocNodes.def"
5215 }
5216 }
5217
5218 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) {
5219 Visit(TL.getReturnLoc(), Sema::AbstractReturnType);
5220 for (unsigned I = 0, E = TL.getNumParams(); I != E; ++I) {
5221 if (!TL.getParam(I))
5222 continue;
5223
5224 TypeSourceInfo *TSI = TL.getParam(I)->getTypeSourceInfo();
5225 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType);
5226 }
5227 }
5228
5229 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) {
5230 Visit(TL.getElementLoc(), Sema::AbstractArrayType);
5231 }
5232
5233 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) {
5234 // Visit the type parameters from a permissive context.
5235 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) {
5236 TemplateArgumentLoc TAL = TL.getArgLoc(I);
5237 if (TAL.getArgument().getKind() == TemplateArgument::Type)
5238 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo())
5239 Visit(TSI->getTypeLoc(), Sema::AbstractNone);
5240 // TODO: other template argument types?
5241 }
5242 }
5243
5244 // Visit pointee types from a permissive context.
5245#define CheckPolymorphic(Type)void Check(Type TL, Sema::AbstractDiagSelID Sel) { Visit(TL.getNextTypeLoc
(), Sema::AbstractNone); }
\
5246 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \
5247 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \
5248 }
5249 CheckPolymorphic(PointerTypeLoc)void Check(PointerTypeLoc TL, Sema::AbstractDiagSelID Sel) { Visit
(TL.getNextTypeLoc(), Sema::AbstractNone); }
5250 CheckPolymorphic(ReferenceTypeLoc)void Check(ReferenceTypeLoc TL, Sema::AbstractDiagSelID Sel) {
Visit(TL.getNextTypeLoc(), Sema::AbstractNone); }
5251 CheckPolymorphic(MemberPointerTypeLoc)void Check(MemberPointerTypeLoc TL, Sema::AbstractDiagSelID Sel
) { Visit(TL.getNextTypeLoc(), Sema::AbstractNone); }
5252 CheckPolymorphic(BlockPointerTypeLoc)void Check(BlockPointerTypeLoc TL, Sema::AbstractDiagSelID Sel
) { Visit(TL.getNextTypeLoc(), Sema::AbstractNone); }
5253 CheckPolymorphic(AtomicTypeLoc)void Check(AtomicTypeLoc TL, Sema::AbstractDiagSelID Sel) { Visit
(TL.getNextTypeLoc(), Sema::AbstractNone); }
5254
5255 /// Handle all the types we haven't given a more specific
5256 /// implementation for above.
5257 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) {
5258 // Every other kind of type that we haven't called out already
5259 // that has an inner type is either (1) sugar or (2) contains that
5260 // inner type in some way as a subobject.
5261 if (TypeLoc Next = TL.getNextTypeLoc())
5262 return Visit(Next, Sel);
5263
5264 // If there's no inner type and we're in a permissive context,
5265 // don't diagnose.
5266 if (Sel == Sema::AbstractNone) return;
5267
5268 // Check whether the type matches the abstract type.
5269 QualType T = TL.getType();
5270 if (T->isArrayType()) {
5271 Sel = Sema::AbstractArrayType;
5272 T = Info.S.Context.getBaseElementType(T);
5273 }
5274 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType();
5275 if (CT != Info.AbstractType) return;
5276
5277 // It matched; do some magic.
5278 if (Sel == Sema::AbstractArrayType) {
5279 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type)
5280 << T << TL.getSourceRange();
5281 } else {
5282 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl)
5283 << Sel << T << TL.getSourceRange();
5284 }
5285 Info.DiagnoseAbstractType();
5286 }
5287};
5288
5289void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL,
5290 Sema::AbstractDiagSelID Sel) {
5291 CheckAbstractUsage(*this, D).Visit(TL, Sel);
5292}
5293
5294}
5295
5296/// Check for invalid uses of an abstract type in a method declaration.
5297static void CheckAbstractClassUsage(AbstractUsageInfo &Info,
5298 CXXMethodDecl *MD) {
5299 // No need to do the check on definitions, which require that
5300 // the return/param types be complete.
5301 if (MD->doesThisDeclarationHaveABody())
5302 return;
5303
5304 // For safety's sake, just ignore it if we don't have type source
5305 // information. This should never happen for non-implicit methods,
5306 // but...
5307 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo())
5308 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone);
5309}
5310
5311/// Check for invalid uses of an abstract type within a class definition.
5312static void CheckAbstractClassUsage(AbstractUsageInfo &Info,
5313 CXXRecordDecl *RD) {
5314 for (auto *D : RD->decls()) {
5315 if (D->isImplicit()) continue;
5316
5317 // Methods and method templates.
5318 if (isa<CXXMethodDecl>(D)) {
5319 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D));
5320 } else if (isa<FunctionTemplateDecl>(D)) {
5321 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl();
5322 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD));
5323
5324 // Fields and static variables.
5325 } else if (isa<FieldDecl>(D)) {
5326 FieldDecl *FD = cast<FieldDecl>(D);
5327 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo())
5328 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType);
5329 } else if (isa<VarDecl>(D)) {
5330 VarDecl *VD = cast<VarDecl>(D);
5331 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo())
5332 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType);
5333
5334 // Nested classes and class templates.
5335 } else if (isa<CXXRecordDecl>(D)) {
5336 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D));
5337 } else if (isa<ClassTemplateDecl>(D)) {
5338 CheckAbstractClassUsage(Info,
5339 cast<ClassTemplateDecl>(D)->getTemplatedDecl());
5340 }
5341 }
5342}
5343
5344static void ReferenceDllExportedMethods(Sema &S, CXXRecordDecl *Class) {
5345 Attr *ClassAttr = getDLLAttr(Class);
5346 if (!ClassAttr)
5347 return;
5348
5349 assert(ClassAttr->getKind() == attr::DLLExport)((ClassAttr->getKind() == attr::DLLExport) ? static_cast<
void> (0) : __assert_fail ("ClassAttr->getKind() == attr::DLLExport"
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 5349, __PRETTY_FUNCTION__))
;
5350
5351 TemplateSpecializationKind TSK = Class->getTemplateSpecializationKind();
5352
5353 if (TSK == TSK_ExplicitInstantiationDeclaration)
5354 // Don't go any further if this is just an explicit instantiation
5355 // declaration.
5356 return;
5357
5358 for (Decl *Member : Class->decls()) {
5359 auto *MD = dyn_cast<CXXMethodDecl>(Member);
5360 if (!MD)
5361 continue;
5362
5363 if (Member->getAttr<DLLExportAttr>()) {
5364 if (MD->isUserProvided()) {
5365 // Instantiate non-default class member functions ...
5366
5367 // .. except for certain kinds of template specializations.
5368 if (TSK == TSK_ImplicitInstantiation && !ClassAttr->isInherited())
5369 continue;
5370
5371 S.MarkFunctionReferenced(Class->getLocation(), MD);
5372
5373 // The function will be passed to the consumer when its definition is
5374 // encountered.
5375 } else if (!MD->isTrivial() || MD->isExplicitlyDefaulted() ||
5376 MD->isCopyAssignmentOperator() ||
5377 MD->isMoveAssignmentOperator()) {
5378 // Synthesize and instantiate non-trivial implicit methods, explicitly
5379 // defaulted methods, and the copy and move assignment operators. The
5380 // latter are exported even if they are trivial, because the address of
5381 // an operator can be taken and should compare equal accross libraries.
5382 DiagnosticErrorTrap Trap(S.Diags);
5383 S.MarkFunctionReferenced(Class->getLocation(), MD);
5384 if (Trap.hasErrorOccurred()) {
5385 S.Diag(ClassAttr->getLocation(), diag::note_due_to_dllexported_class)
5386 << Class->getName() << !S.getLangOpts().CPlusPlus11;
5387 break;
5388 }
5389
5390 // There is no later point when we will see the definition of this
5391 // function, so pass it to the consumer now.
5392 S.Consumer.HandleTopLevelDecl(DeclGroupRef(MD));
5393 }
5394 }
5395 }
5396}
5397
5398/// \brief Check class-level dllimport/dllexport attribute.
5399void Sema::checkClassLevelDLLAttribute(CXXRecordDecl *Class) {
5400 Attr *ClassAttr = getDLLAttr(Class);
5401
5402 // MSVC inherits DLL attributes to partial class template specializations.
5403 if (Context.getTargetInfo().getCXXABI().isMicrosoft() && !ClassAttr) {
5404 if (auto *Spec = dyn_cast<ClassTemplatePartialSpecializationDecl>(Class)) {
5405 if (Attr *TemplateAttr =
5406 getDLLAttr(Spec->getSpecializedTemplate()->getTemplatedDecl())) {
5407 auto *A = cast<InheritableAttr>(TemplateAttr->clone(getASTContext()));
5408 A->setInherited(true);
5409 ClassAttr = A;
5410 }
5411 }
5412 }
5413
5414 if (!ClassAttr)
5415 return;
5416
5417 if (!Class->isExternallyVisible()) {
5418 Diag(Class->getLocation(), diag::err_attribute_dll_not_extern)
5419 << Class << ClassAttr;
5420 return;
5421 }
5422
5423 if (Context.getTargetInfo().getCXXABI().isMicrosoft() &&
5424 !ClassAttr->isInherited()) {
5425 // Diagnose dll attributes on members of class with dll attribute.
5426 for (Decl *Member : Class->decls()) {
5427 if (!isa<VarDecl>(Member) && !isa<CXXMethodDecl>(Member))
5428 continue;
5429 InheritableAttr *MemberAttr = getDLLAttr(Member);
5430 if (!MemberAttr || MemberAttr->isInherited() || Member->isInvalidDecl())
5431 continue;
5432
5433 Diag(MemberAttr->getLocation(),
5434 diag::err_attribute_dll_member_of_dll_class)
5435 << MemberAttr << ClassAttr;
5436 Diag(ClassAttr->getLocation(), diag::note_previous_attribute);
5437 Member->setInvalidDecl();
5438 }
5439 }
5440
5441 if (Class->getDescribedClassTemplate())
5442 // Don't inherit dll attribute until the template is instantiated.
5443 return;
5444
5445 // The class is either imported or exported.
5446 const bool ClassExported = ClassAttr->getKind() == attr::DLLExport;
5447
5448 TemplateSpecializationKind TSK = Class->getTemplateSpecializationKind();
5449
5450 // Ignore explicit dllexport on explicit class template instantiation declarations.
5451 if (ClassExported && !ClassAttr->isInherited() &&
5452 TSK == TSK_ExplicitInstantiationDeclaration) {
5453 Class->dropAttr<DLLExportAttr>();
5454 return;
5455 }
5456
5457 // Force declaration of implicit members so they can inherit the attribute.
5458 ForceDeclarationOfImplicitMembers(Class);
5459
5460 // FIXME: MSVC's docs say all bases must be exportable, but this doesn't
5461 // seem to be true in practice?
5462
5463 for (Decl *Member : Class->decls()) {
5464 VarDecl *VD = dyn_cast<VarDecl>(Member);
5465 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member);
5466
5467 // Only methods and static fields inherit the attributes.
5468 if (!VD && !MD)
5469 continue;
5470
5471 if (MD) {
5472 // Don't process deleted methods.
5473 if (MD->isDeleted())
5474 continue;
5475
5476 if (MD->isInlined()) {
5477 // MinGW does not import or export inline methods.
5478 if (!Context.getTargetInfo().getCXXABI().isMicrosoft() &&
5479 !Context.getTargetInfo().getTriple().isWindowsItaniumEnvironment())
5480 continue;
5481
5482 // MSVC versions before 2015 don't export the move assignment operators
5483 // and move constructor, so don't attempt to import/export them if
5484 // we have a definition.
5485 auto *Ctor = dyn_cast<CXXConstructorDecl>(MD);
5486 if ((MD->isMoveAssignmentOperator() ||
5487 (Ctor && Ctor->isMoveConstructor())) &&
5488 !getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015))
5489 continue;
5490
5491 // MSVC2015 doesn't export trivial defaulted x-tor but copy assign
5492 // operator is exported anyway.
5493 if (getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015) &&
5494 (Ctor || isa<CXXDestructorDecl>(MD)) && MD->isTrivial())
5495 continue;
5496 }
5497 }
5498
5499 if (!cast<NamedDecl>(Member)->isExternallyVisible())
5500 continue;
5501
5502 if (!getDLLAttr(Member)) {
5503 auto *NewAttr =
5504 cast<InheritableAttr>(ClassAttr->clone(getASTContext()));
5505 NewAttr->setInherited(true);
5506 Member->addAttr(NewAttr);
5507 }
5508 }
5509
5510 if (ClassExported)
5511 DelayedDllExportClasses.push_back(Class);
5512}
5513
5514/// \brief Perform propagation of DLL attributes from a derived class to a
5515/// templated base class for MS compatibility.
5516void Sema::propagateDLLAttrToBaseClassTemplate(
5517 CXXRecordDecl *Class, Attr *ClassAttr,
5518 ClassTemplateSpecializationDecl *BaseTemplateSpec, SourceLocation BaseLoc) {
5519 if (getDLLAttr(
5520 BaseTemplateSpec->getSpecializedTemplate()->getTemplatedDecl())) {
5521 // If the base class template has a DLL attribute, don't try to change it.
5522 return;
5523 }
5524
5525 auto TSK = BaseTemplateSpec->getSpecializationKind();
5526 if (!getDLLAttr(BaseTemplateSpec) &&
5527 (TSK == TSK_Undeclared || TSK == TSK_ExplicitInstantiationDeclaration ||
5528 TSK == TSK_ImplicitInstantiation)) {
5529 // The template hasn't been instantiated yet (or it has, but only as an
5530 // explicit instantiation declaration or implicit instantiation, which means
5531 // we haven't codegenned any members yet), so propagate the attribute.
5532 auto *NewAttr = cast<InheritableAttr>(ClassAttr->clone(getASTContext()));
5533 NewAttr->setInherited(true);
5534 BaseTemplateSpec->addAttr(NewAttr);
5535
5536 // If the template is already instantiated, checkDLLAttributeRedeclaration()
5537 // needs to be run again to work see the new attribute. Otherwise this will
5538 // get run whenever the template is instantiated.
5539 if (TSK != TSK_Undeclared)
5540 checkClassLevelDLLAttribute(BaseTemplateSpec);
5541
5542 return;
5543 }
5544
5545 if (getDLLAttr(BaseTemplateSpec)) {
5546 // The template has already been specialized or instantiated with an
5547 // attribute, explicitly or through propagation. We should not try to change
5548 // it.
5549 return;
5550 }
5551
5552 // The template was previously instantiated or explicitly specialized without
5553 // a dll attribute, It's too late for us to add an attribute, so warn that
5554 // this is unsupported.
5555 Diag(BaseLoc, diag::warn_attribute_dll_instantiated_base_class)
5556 << BaseTemplateSpec->isExplicitSpecialization();
5557 Diag(ClassAttr->getLocation(), diag::note_attribute);
5558 if (BaseTemplateSpec->isExplicitSpecialization()) {
5559 Diag(BaseTemplateSpec->getLocation(),
5560 diag::note_template_class_explicit_specialization_was_here)
5561 << BaseTemplateSpec;
5562 } else {
5563 Diag(BaseTemplateSpec->getPointOfInstantiation(),
5564 diag::note_template_class_instantiation_was_here)
5565 << BaseTemplateSpec;
5566 }
5567}
5568
5569static void DefineImplicitSpecialMember(Sema &S, CXXMethodDecl *MD,
5570 SourceLocation DefaultLoc) {
5571 switch (S.getSpecialMember(MD)) {
5572 case Sema::CXXDefaultConstructor:
5573 S.DefineImplicitDefaultConstructor(DefaultLoc,
5574 cast<CXXConstructorDecl>(MD));
5575 break;
5576 case Sema::CXXCopyConstructor:
5577 S.DefineImplicitCopyConstructor(DefaultLoc, cast<CXXConstructorDecl>(MD));
5578 break;
5579 case Sema::CXXCopyAssignment:
5580 S.DefineImplicitCopyAssignment(DefaultLoc, MD);
5581 break;
5582 case Sema::CXXDestructor:
5583 S.DefineImplicitDestructor(DefaultLoc, cast<CXXDestructorDecl>(MD));
5584 break;
5585 case Sema::CXXMoveConstructor:
5586 S.DefineImplicitMoveConstructor(DefaultLoc, cast<CXXConstructorDecl>(MD));
5587 break;
5588 case Sema::CXXMoveAssignment:
5589 S.DefineImplicitMoveAssignment(DefaultLoc, MD);
5590 break;
5591 case Sema::CXXInvalid:
5592 llvm_unreachable("Invalid special member.")::llvm::llvm_unreachable_internal("Invalid special member.", "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 5592)
;
5593 }
5594}
5595
5596/// \brief Perform semantic checks on a class definition that has been
5597/// completing, introducing implicitly-declared members, checking for
5598/// abstract types, etc.
5599void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) {
5600 if (!Record)
5601 return;
5602
5603 if (Record->isAbstract() && !Record->isInvalidDecl()) {
5604 AbstractUsageInfo Info(*this, Record);
5605 CheckAbstractClassUsage(Info, Record);
5606 }
5607
5608 // If this is not an aggregate type and has no user-declared constructor,
5609 // complain about any non-static data members of reference or const scalar
5610 // type, since they will never get initializers.
5611 if (!Record->isInvalidDecl() && !Record->isDependentType() &&
5612 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() &&
5613 !Record->isLambda()) {
5614 bool Complained = false;
5615 for (const auto *F : Record->fields()) {
5616 if (F->hasInClassInitializer() || F->isUnnamedBitfield())
5617 continue;
5618
5619 if (F->getType()->isReferenceType() ||
5620 (F->getType().isConstQualified() && F->getType()->isScalarType())) {
5621 if (!Complained) {
5622 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst)
5623 << Record->getTagKind() << Record;
5624 Complained = true;
5625 }
5626
5627 Diag(F->getLocation(), diag::note_refconst_member_not_initialized)
5628 << F->getType()->isReferenceType()
5629 << F->getDeclName();
5630 }
5631 }
5632 }
5633
5634 if (Record->getIdentifier()) {
5635 // C++ [class.mem]p13:
5636 // If T is the name of a class, then each of the following shall have a
5637 // name different from T:
5638 // - every member of every anonymous union that is a member of class T.
5639 //
5640 // C++ [class.mem]p14:
5641 // In addition, if class T has a user-declared constructor (12.1), every
5642 // non-static data member of class T shall have a name different from T.
5643 DeclContext::lookup_result R = Record->lookup(Record->getDeclName());
5644 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E;
5645 ++I) {
5646 NamedDecl *D = *I;
5647 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) ||
5648 isa<IndirectFieldDecl>(D)) {
5649 Diag(D->getLocation(), diag::err_member_name_of_class)
5650 << D->getDeclName();
5651 break;
5652 }
5653 }
5654 }
5655
5656 // Warn if the class has virtual methods but non-virtual public destructor.
5657 if (Record->isPolymorphic() && !Record->isDependentType()) {
5658 CXXDestructorDecl *dtor = Record->getDestructor();
5659 if ((!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) &&
5660 !Record->hasAttr<FinalAttr>())
5661 Diag(dtor ? dtor->getLocation() : Record->getLocation(),
5662 diag::warn_non_virtual_dtor) << Context.getRecordType(Record);
5663 }
5664
5665 if (Record->isAbstract()) {
5666 if (FinalAttr *FA = Record->getAttr<FinalAttr>()) {
5667 Diag(Record->getLocation(), diag::warn_abstract_final_class)
5668 << FA->isSpelledAsSealed();
5669 DiagnoseAbstractType(Record);
5670 }
5671 }
5672
5673 bool HasMethodWithOverrideControl = false,
5674 HasOverridingMethodWithoutOverrideControl = false;
5675 if (!Record->isDependentType()) {
5676 for (auto *M : Record->methods()) {
5677 // See if a method overloads virtual methods in a base
5678 // class without overriding any.
5679 if (!M->isStatic())
5680 DiagnoseHiddenVirtualMethods(M);
5681 if (M->hasAttr<OverrideAttr>())
5682 HasMethodWithOverrideControl = true;
5683 else if (M->size_overridden_methods() > 0)
5684 HasOverridingMethodWithoutOverrideControl = true;
5685 // Check whether the explicitly-defaulted special members are valid.
5686 if (!M->isInvalidDecl() && M->isExplicitlyDefaulted())
5687 CheckExplicitlyDefaultedSpecialMember(M);
5688
5689 // For an explicitly defaulted or deleted special member, we defer
5690 // determining triviality until the class is complete. That time is now!
5691 CXXSpecialMember CSM = getSpecialMember(M);
5692 if (!M->isImplicit() && !M->isUserProvided()) {
5693 if (CSM != CXXInvalid) {
5694 M->setTrivial(SpecialMemberIsTrivial(M, CSM));
5695
5696 // Inform the class that we've finished declaring this member.
5697 Record->finishedDefaultedOrDeletedMember(M);
5698 }
5699 }
5700
5701 if (!M->isInvalidDecl() && M->isExplicitlyDefaulted() &&
5702 M->hasAttr<DLLExportAttr>()) {
5703 if (getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015) &&
5704 M->isTrivial() &&
5705 (CSM == CXXDefaultConstructor || CSM == CXXCopyConstructor ||
5706 CSM == CXXDestructor))
5707 M->dropAttr<DLLExportAttr>();
5708
5709 if (M->hasAttr<DLLExportAttr>()) {
5710 DefineImplicitSpecialMember(*this, M, M->getLocation());
5711 ActOnFinishInlineFunctionDef(M);
5712 }
5713 }
5714 }
5715 }
5716
5717 if (HasMethodWithOverrideControl &&
5718 HasOverridingMethodWithoutOverrideControl) {
5719 // At least one method has the 'override' control declared.
5720 // Diagnose all other overridden methods which do not have 'override' specified on them.
5721 for (auto *M : Record->methods())
5722 DiagnoseAbsenceOfOverrideControl(M);
5723 }
5724
5725 // ms_struct is a request to use the same ABI rules as MSVC. Check
5726 // whether this class uses any C++ features that are implemented
5727 // completely differently in MSVC, and if so, emit a diagnostic.
5728 // That diagnostic defaults to an error, but we allow projects to
5729 // map it down to a warning (or ignore it). It's a fairly common
5730 // practice among users of the ms_struct pragma to mass-annotate
5731 // headers, sweeping up a bunch of types that the project doesn't
5732 // really rely on MSVC-compatible layout for. We must therefore
5733 // support "ms_struct except for C++ stuff" as a secondary ABI.
5734 if (Record->isMsStruct(Context) &&
5735 (Record->isPolymorphic() || Record->getNumBases())) {
5736 Diag(Record->getLocation(), diag::warn_cxx_ms_struct);
5737 }
5738
5739 checkClassLevelDLLAttribute(Record);
5740}
5741
5742/// Look up the special member function that would be called by a special
5743/// member function for a subobject of class type.
5744///
5745/// \param Class The class type of the subobject.
5746/// \param CSM The kind of special member function.
5747/// \param FieldQuals If the subobject is a field, its cv-qualifiers.
5748/// \param ConstRHS True if this is a copy operation with a const object
5749/// on its RHS, that is, if the argument to the outer special member
5750/// function is 'const' and this is not a field marked 'mutable'.
5751static Sema::SpecialMemberOverloadResult *lookupCallFromSpecialMember(
5752 Sema &S, CXXRecordDecl *Class, Sema::CXXSpecialMember CSM,
5753 unsigned FieldQuals, bool ConstRHS) {
5754 unsigned LHSQuals = 0;
5755 if (CSM == Sema::CXXCopyAssignment || CSM == Sema::CXXMoveAssignment)
5756 LHSQuals = FieldQuals;
5757
5758 unsigned RHSQuals = FieldQuals;
5759 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor)
5760 RHSQuals = 0;
5761 else if (ConstRHS)
5762 RHSQuals |= Qualifiers::Const;
5763
5764 return S.LookupSpecialMember(Class, CSM,
5765 RHSQuals & Qualifiers::Const,
5766 RHSQuals & Qualifiers::Volatile,
5767 false,
5768 LHSQuals & Qualifiers::Const,
5769 LHSQuals & Qualifiers::Volatile);
5770}
5771
5772class Sema::InheritedConstructorInfo {
5773 Sema &S;
5774 SourceLocation UseLoc;
5775
5776 /// A mapping from the base classes through which the constructor was
5777 /// inherited to the using shadow declaration in that base class (or a null
5778 /// pointer if the constructor was declared in that base class).
5779 llvm::DenseMap<CXXRecordDecl *, ConstructorUsingShadowDecl *>
5780 InheritedFromBases;
5781
5782public:
5783 InheritedConstructorInfo(Sema &S, SourceLocation UseLoc,
5784 ConstructorUsingShadowDecl *Shadow)
5785 : S(S), UseLoc(UseLoc) {
5786 bool DiagnosedMultipleConstructedBases = false;
5787 CXXRecordDecl *ConstructedBase = nullptr;
5788 UsingDecl *ConstructedBaseUsing = nullptr;
5789
5790 // Find the set of such base class subobjects and check that there's a
5791 // unique constructed subobject.
5792 for (auto *D : Shadow->redecls()) {
5793 auto *DShadow = cast<ConstructorUsingShadowDecl>(D);
5794 auto *DNominatedBase = DShadow->getNominatedBaseClass();
5795 auto *DConstructedBase = DShadow->getConstructedBaseClass();
5796
5797 InheritedFromBases.insert(
5798 std::make_pair(DNominatedBase->getCanonicalDecl(),
5799 DShadow->getNominatedBaseClassShadowDecl()));
5800 if (DShadow->constructsVirtualBase())
5801 InheritedFromBases.insert(
5802 std::make_pair(DConstructedBase->getCanonicalDecl(),
5803 DShadow->getConstructedBaseClassShadowDecl()));
5804 else
5805 assert(DNominatedBase == DConstructedBase)((DNominatedBase == DConstructedBase) ? static_cast<void>
(0) : __assert_fail ("DNominatedBase == DConstructedBase", "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 5805, __PRETTY_FUNCTION__))
;
5806
5807 // [class.inhctor.init]p2:
5808 // If the constructor was inherited from multiple base class subobjects
5809 // of type B, the program is ill-formed.
5810 if (!ConstructedBase) {
5811 ConstructedBase = DConstructedBase;
5812 ConstructedBaseUsing = D->getUsingDecl();
5813 } else if (ConstructedBase != DConstructedBase &&
5814 !Shadow->isInvalidDecl()) {
5815 if (!DiagnosedMultipleConstructedBases) {
5816 S.Diag(UseLoc, diag::err_ambiguous_inherited_constructor)
5817 << Shadow->getTargetDecl();
5818 S.Diag(ConstructedBaseUsing->getLocation(),
5819 diag::note_ambiguous_inherited_constructor_using)
5820 << ConstructedBase;
5821 DiagnosedMultipleConstructedBases = true;
5822 }
5823 S.Diag(D->getUsingDecl()->getLocation(),
5824 diag::note_ambiguous_inherited_constructor_using)
5825 << DConstructedBase;
5826 }
5827 }
5828
5829 if (DiagnosedMultipleConstructedBases)
5830 Shadow->setInvalidDecl();
5831 }
5832
5833 /// Find the constructor to use for inherited construction of a base class,
5834 /// and whether that base class constructor inherits the constructor from a
5835 /// virtual base class (in which case it won't actually invoke it).
5836 std::pair<CXXConstructorDecl *, bool>
5837 findConstructorForBase(CXXRecordDecl *Base, CXXConstructorDecl *Ctor) const {
5838 auto It = InheritedFromBases.find(Base->getCanonicalDecl());
5839 if (It == InheritedFromBases.end())
5840 return std::make_pair(nullptr, false);
5841
5842 // This is an intermediary class.
5843 if (It->second)
5844 return std::make_pair(
5845 S.findInheritingConstructor(UseLoc, Ctor, It->second),
5846 It->second->constructsVirtualBase());
5847
5848 // This is the base class from which the constructor was inherited.
5849 return std::make_pair(Ctor, false);
5850 }
5851};
5852
5853/// Is the special member function which would be selected to perform the
5854/// specified operation on the specified class type a constexpr constructor?
5855static bool
5856specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl,
5857 Sema::CXXSpecialMember CSM, unsigned Quals,
5858 bool ConstRHS,
5859 CXXConstructorDecl *InheritedCtor = nullptr,
5860 Sema::InheritedConstructorInfo *Inherited = nullptr) {
5861 // If we're inheriting a constructor, see if we need to call it for this base
5862 // class.
5863 if (InheritedCtor) {
5864 assert(CSM == Sema::CXXDefaultConstructor)((CSM == Sema::CXXDefaultConstructor) ? static_cast<void>
(0) : __assert_fail ("CSM == Sema::CXXDefaultConstructor", "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 5864, __PRETTY_FUNCTION__))
;
5865 auto BaseCtor =
5866 Inherited->findConstructorForBase(ClassDecl, InheritedCtor).first;
5867 if (BaseCtor)
5868 return BaseCtor->isConstexpr();
5869 }
5870
5871 if (CSM == Sema::CXXDefaultConstructor)
5872 return ClassDecl->hasConstexprDefaultConstructor();
5873
5874 Sema::SpecialMemberOverloadResult *SMOR =
5875 lookupCallFromSpecialMember(S, ClassDecl, CSM, Quals, ConstRHS);
5876 if (!SMOR || !SMOR->getMethod())
5877 // A constructor we wouldn't select can't be "involved in initializing"
5878 // anything.
5879 return true;
5880 return SMOR->getMethod()->isConstexpr();
5881}
5882
5883/// Determine whether the specified special member function would be constexpr
5884/// if it were implicitly defined.
5885static bool defaultedSpecialMemberIsConstexpr(
5886 Sema &S, CXXRecordDecl *ClassDecl, Sema::CXXSpecialMember CSM,
5887 bool ConstArg, CXXConstructorDecl *InheritedCtor = nullptr,
5888 Sema::InheritedConstructorInfo *Inherited = nullptr) {
5889 if (!S.getLangOpts().CPlusPlus11)
5890 return false;
5891
5892 // C++11 [dcl.constexpr]p4:
5893 // In the definition of a constexpr constructor [...]
5894 bool Ctor = true;
5895 switch (CSM) {
5896 case Sema::CXXDefaultConstructor:
5897 if (Inherited)
5898 break;
5899 // Since default constructor lookup is essentially trivial (and cannot
5900 // involve, for instance, template instantiation), we compute whether a
5901 // defaulted default constructor is constexpr directly within CXXRecordDecl.
5902 //
5903 // This is important for performance; we need to know whether the default
5904 // constructor is constexpr to determine whether the type is a literal type.
5905 return ClassDecl->defaultedDefaultConstructorIsConstexpr();
5906
5907 case Sema::CXXCopyConstructor:
5908 case Sema::CXXMoveConstructor:
5909 // For copy or move constructors, we need to perform overload resolution.
5910 break;
5911
5912 case Sema::CXXCopyAssignment:
5913 case Sema::CXXMoveAssignment:
5914 if (!S.getLangOpts().CPlusPlus14)
5915 return false;
5916 // In C++1y, we need to perform overload resolution.
5917 Ctor = false;
5918 break;
5919
5920 case Sema::CXXDestructor:
5921 case Sema::CXXInvalid:
5922 return false;
5923 }
5924
5925 // -- if the class is a non-empty union, or for each non-empty anonymous
5926 // union member of a non-union class, exactly one non-static data member
5927 // shall be initialized; [DR1359]
5928 //
5929 // If we squint, this is guaranteed, since exactly one non-static data member
5930 // will be initialized (if the constructor isn't deleted), we just don't know
5931 // which one.
5932 if (Ctor && ClassDecl->isUnion())
5933 return CSM == Sema::CXXDefaultConstructor
5934 ? ClassDecl->hasInClassInitializer() ||
5935 !ClassDecl->hasVariantMembers()
5936 : true;
5937
5938 // -- the class shall not have any virtual base classes;
5939 if (Ctor && ClassDecl->getNumVBases())
5940 return false;
5941
5942 // C++1y [class.copy]p26:
5943 // -- [the class] is a literal type, and
5944 if (!Ctor && !ClassDecl->isLiteral())
5945 return false;
5946
5947 // -- every constructor involved in initializing [...] base class
5948 // sub-objects shall be a constexpr constructor;
5949 // -- the assignment operator selected to copy/move each direct base
5950 // class is a constexpr function, and
5951 for (const auto &B : ClassDecl->bases()) {
5952 const RecordType *BaseType = B.getType()->getAs<RecordType>();
5953 if (!BaseType) continue;
5954
5955 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
5956 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, 0, ConstArg,
5957 InheritedCtor, Inherited))
5958 return false;
5959 }
5960
5961 // -- every constructor involved in initializing non-static data members
5962 // [...] shall be a constexpr constructor;
5963 // -- every non-static data member and base class sub-object shall be
5964 // initialized
5965 // -- for each non-static data member of X that is of class type (or array
5966 // thereof), the assignment operator selected to copy/move that member is
5967 // a constexpr function
5968 for (const auto *F : ClassDecl->fields()) {
5969 if (F->isInvalidDecl())
5970 continue;
5971 if (CSM == Sema::CXXDefaultConstructor && F->hasInClassInitializer())
5972 continue;
5973 QualType BaseType = S.Context.getBaseElementType(F->getType());
5974 if (const RecordType *RecordTy = BaseType->getAs<RecordType>()) {
5975 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl());
5976 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM,
5977 BaseType.getCVRQualifiers(),
5978 ConstArg && !F->isMutable()))
5979 return false;
5980 } else if (CSM == Sema::CXXDefaultConstructor) {
5981 return false;
5982 }
5983 }
5984
5985 // All OK, it's constexpr!
5986 return true;
5987}
5988
5989static Sema::ImplicitExceptionSpecification
5990computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) {
5991 switch (S.getSpecialMember(MD)) {
5992 case Sema::CXXDefaultConstructor:
5993 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD);
5994 case Sema::CXXCopyConstructor:
5995 return S.ComputeDefaultedCopyCtorExceptionSpec(MD);
5996 case Sema::CXXCopyAssignment:
5997 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD);
5998 case Sema::CXXMoveConstructor:
5999 return S.ComputeDefaultedMoveCtorExceptionSpec(MD);
6000 case Sema::CXXMoveAssignment:
6001 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD);
6002 case Sema::CXXDestructor:
6003 return S.ComputeDefaultedDtorExceptionSpec(MD);
6004 case Sema::CXXInvalid:
6005 break;
6006 }
6007 assert(cast<CXXConstructorDecl>(MD)->getInheritedConstructor() &&((cast<CXXConstructorDecl>(MD)->getInheritedConstructor
() && "only special members have implicit exception specs"
) ? static_cast<void> (0) : __assert_fail ("cast<CXXConstructorDecl>(MD)->getInheritedConstructor() && \"only special members have implicit exception specs\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 6008, __PRETTY_FUNCTION__))
6008 "only special members have implicit exception specs")((cast<CXXConstructorDecl>(MD)->getInheritedConstructor
() && "only special members have implicit exception specs"
) ? static_cast<void> (0) : __assert_fail ("cast<CXXConstructorDecl>(MD)->getInheritedConstructor() && \"only special members have implicit exception specs\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 6008, __PRETTY_FUNCTION__))
;
6009 return S.ComputeInheritingCtorExceptionSpec(Loc,
6010 cast<CXXConstructorDecl>(MD));
6011}
6012
6013static FunctionProtoType::ExtProtoInfo getImplicitMethodEPI(Sema &S,
6014 CXXMethodDecl *MD) {
6015 FunctionProtoType::ExtProtoInfo EPI;
6016
6017 // Build an exception specification pointing back at this member.
6018 EPI.ExceptionSpec.Type = EST_Unevaluated;
6019 EPI.ExceptionSpec.SourceDecl = MD;
6020
6021 // Set the calling convention to the default for C++ instance methods.
6022 EPI.ExtInfo = EPI.ExtInfo.withCallingConv(
6023 S.Context.getDefaultCallingConvention(/*IsVariadic=*/false,
6024 /*IsCXXMethod=*/true));
6025 return EPI;
6026}
6027
6028void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) {
6029 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>();
6030 if (FPT->getExceptionSpecType() != EST_Unevaluated)
6031 return;
6032
6033 // Evaluate the exception specification.
6034 auto IES = computeImplicitExceptionSpec(*this, Loc, MD);
6035 auto ESI = IES.getExceptionSpec();
6036
6037 // Update the type of the special member to use it.
6038 UpdateExceptionSpec(MD, ESI);
6039
6040 // A user-provided destructor can be defined outside the class. When that
6041 // happens, be sure to update the exception specification on both
6042 // declarations.
6043 const FunctionProtoType *CanonicalFPT =
6044 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>();
6045 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated)
6046 UpdateExceptionSpec(MD->getCanonicalDecl(), ESI);
6047}
6048
6049void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) {
6050 CXXRecordDecl *RD = MD->getParent();
6051 CXXSpecialMember CSM = getSpecialMember(MD);
6052
6053 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid &&((MD->isExplicitlyDefaulted() && CSM != CXXInvalid
&& "not an explicitly-defaulted special member") ? static_cast
<void> (0) : __assert_fail ("MD->isExplicitlyDefaulted() && CSM != CXXInvalid && \"not an explicitly-defaulted special member\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 6054, __PRETTY_FUNCTION__))
6054 "not an explicitly-defaulted special member")((MD->isExplicitlyDefaulted() && CSM != CXXInvalid
&& "not an explicitly-defaulted special member") ? static_cast
<void> (0) : __assert_fail ("MD->isExplicitlyDefaulted() && CSM != CXXInvalid && \"not an explicitly-defaulted special member\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 6054, __PRETTY_FUNCTION__))
;
6055
6056 // Whether this was the first-declared instance of the constructor.
6057 // This affects whether we implicitly add an exception spec and constexpr.
6058 bool First = MD == MD->getCanonicalDecl();
6059
6060 bool HadError = false;
6061
6062 // C++11 [dcl.fct.def.default]p1:
6063 // A function that is explicitly defaulted shall
6064 // -- be a special member function (checked elsewhere),
6065 // -- have the same type (except for ref-qualifiers, and except that a
6066 // copy operation can take a non-const reference) as an implicit
6067 // declaration, and
6068 // -- not have default arguments.
6069 unsigned ExpectedParams = 1;
6070 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor)
6071 ExpectedParams = 0;
6072 if (MD->getNumParams() != ExpectedParams) {
6073 // This also checks for default arguments: a copy or move constructor with a
6074 // default argument is classified as a default constructor, and assignment
6075 // operations and destructors can't have default arguments.
6076 Diag(MD->getLocation(), diag::err_defaulted_special_member_params)
6077 << CSM << MD->getSourceRange();
6078 HadError = true;
6079 } else if (MD->isVariadic()) {
6080 Diag(MD->getLocation(), diag::err_defaulted_special_member_variadic)
6081 << CSM << MD->getSourceRange();
6082 HadError = true;
6083 }
6084
6085 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>();
6086
6087 bool CanHaveConstParam = false;
6088 if (CSM == CXXCopyConstructor)
6089 CanHaveConstParam = RD->implicitCopyConstructorHasConstParam();
6090 else if (CSM == CXXCopyAssignment)
6091 CanHaveConstParam = RD->implicitCopyAssignmentHasConstParam();
6092
6093 QualType ReturnType = Context.VoidTy;
6094 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) {
6095 // Check for return type matching.
6096 ReturnType = Type->getReturnType();
6097 QualType ExpectedReturnType =
6098 Context.getLValueReferenceType(Context.getTypeDeclType(RD));
6099 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) {
6100 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type)
6101 << (CSM == CXXMoveAssignment) << ExpectedReturnType;
6102 HadError = true;
6103 }
6104
6105 // A defaulted special member cannot have cv-qualifiers.
6106 if (Type->getTypeQuals()) {
6107 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals)
6108 << (CSM == CXXMoveAssignment) << getLangOpts().CPlusPlus14;
6109 HadError = true;
6110 }
6111 }
6112
6113 // Check for parameter type matching.
6114 QualType ArgType = ExpectedParams ? Type->getParamType(0) : QualType();
6115 bool HasConstParam = false;
6116 if (ExpectedParams && ArgType->isReferenceType()) {
6117 // Argument must be reference to possibly-const T.
6118 QualType ReferentType = ArgType->getPointeeType();
6119 HasConstParam = ReferentType.isConstQualified();
6120
6121 if (ReferentType.isVolatileQualified()) {
6122 Diag(MD->getLocation(),
6123 diag::err_defaulted_special_member_volatile_param) << CSM;
6124 HadError = true;
6125 }
6126
6127 if (HasConstParam && !CanHaveConstParam) {
6128 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) {
6129 Diag(MD->getLocation(),
6130 diag::err_defaulted_special_member_copy_const_param)
6131 << (CSM == CXXCopyAssignment);
6132 // FIXME: Explain why this special member can't be const.
6133 } else {
6134 Diag(MD->getLocation(),
6135 diag::err_defaulted_special_member_move_const_param)
6136 << (CSM == CXXMoveAssignment);
6137 }
6138 HadError = true;
6139 }
6140 } else if (ExpectedParams) {
6141 // A copy assignment operator can take its argument by value, but a
6142 // defaulted one cannot.
6143 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument")((CSM == CXXCopyAssignment && "unexpected non-ref argument"
) ? static_cast<void> (0) : __assert_fail ("CSM == CXXCopyAssignment && \"unexpected non-ref argument\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 6143, __PRETTY_FUNCTION__))
;
6144 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref);
6145 HadError = true;
6146 }
6147
6148 // C++11 [dcl.fct.def.default]p2:
6149 // An explicitly-defaulted function may be declared constexpr only if it
6150 // would have been implicitly declared as constexpr,
6151 // Do not apply this rule to members of class templates, since core issue 1358
6152 // makes such functions always instantiate to constexpr functions. For
6153 // functions which cannot be constexpr (for non-constructors in C++11 and for
6154 // destructors in C++1y), this is checked elsewhere.
6155 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM,
6156 HasConstParam);
6157 if ((getLangOpts().CPlusPlus14 ? !isa<CXXDestructorDecl>(MD)
6158 : isa<CXXConstructorDecl>(MD)) &&
6159 MD->isConstexpr() && !Constexpr &&
6160 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) {
6161 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM;
6162 // FIXME: Explain why the special member can't be constexpr.
6163 HadError = true;
6164 }
6165
6166 // and may have an explicit exception-specification only if it is compatible
6167 // with the exception-specification on the implicit declaration.
6168 if (Type->hasExceptionSpec()) {
6169 // Delay the check if this is the first declaration of the special member,
6170 // since we may not have parsed some necessary in-class initializers yet.
6171 if (First) {
6172 // If the exception specification needs to be instantiated, do so now,
6173 // before we clobber it with an EST_Unevaluated specification below.
6174 if (Type->getExceptionSpecType() == EST_Uninstantiated) {
6175 InstantiateExceptionSpec(MD->getLocStart(), MD);
6176 Type = MD->getType()->getAs<FunctionProtoType>();
6177 }
6178 DelayedDefaultedMemberExceptionSpecs.push_back(std::make_pair(MD, Type));
6179 } else
6180 CheckExplicitlyDefaultedMemberExceptionSpec(MD, Type);
6181 }
6182
6183 // If a function is explicitly defaulted on its first declaration,
6184 if (First) {
6185 // -- it is implicitly considered to be constexpr if the implicit
6186 // definition would be,
6187 MD->setConstexpr(Constexpr);
6188
6189 // -- it is implicitly considered to have the same exception-specification
6190 // as if it had been implicitly declared,
6191 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo();
6192 EPI.ExceptionSpec.Type = EST_Unevaluated;
6193 EPI.ExceptionSpec.SourceDecl = MD;
6194 MD->setType(Context.getFunctionType(ReturnType,
6195 llvm::makeArrayRef(&ArgType,
6196 ExpectedParams),
6197 EPI));
6198 }
6199
6200 if (ShouldDeleteSpecialMember(MD, CSM)) {
6201 if (First) {
6202 SetDeclDeleted(MD, MD->getLocation());
6203 } else {
6204 // C++11 [dcl.fct.def.default]p4:
6205 // [For a] user-provided explicitly-defaulted function [...] if such a
6206 // function is implicitly defined as deleted, the program is ill-formed.
6207 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM;
6208 ShouldDeleteSpecialMember(MD, CSM, nullptr, /*Diagnose*/true);
6209 HadError = true;
6210 }
6211 }
6212
6213 if (HadError)
6214 MD->setInvalidDecl();
6215}
6216
6217/// Check whether the exception specification provided for an
6218/// explicitly-defaulted special member matches the exception specification
6219/// that would have been generated for an implicit special member, per
6220/// C++11 [dcl.fct.def.default]p2.
6221void Sema::CheckExplicitlyDefaultedMemberExceptionSpec(
6222 CXXMethodDecl *MD, const FunctionProtoType *SpecifiedType) {
6223 // If the exception specification was explicitly specified but hadn't been
6224 // parsed when the method was defaulted, grab it now.
6225 if (SpecifiedType->getExceptionSpecType() == EST_Unparsed)
6226 SpecifiedType =
6227 MD->getTypeSourceInfo()->getType()->castAs<FunctionProtoType>();
6228
6229 // Compute the implicit exception specification.
6230 CallingConv CC = Context.getDefaultCallingConvention(/*IsVariadic=*/false,
6231 /*IsCXXMethod=*/true);
6232 FunctionProtoType::ExtProtoInfo EPI(CC);
6233 auto IES = computeImplicitExceptionSpec(*this, MD->getLocation(), MD);
6234 EPI.ExceptionSpec = IES.getExceptionSpec();
6235 const FunctionProtoType *ImplicitType = cast<FunctionProtoType>(
6236 Context.getFunctionType(Context.VoidTy, None, EPI));
6237
6238 // Ensure that it matches.
6239 CheckEquivalentExceptionSpec(
6240 PDiag(diag::err_incorrect_defaulted_exception_spec)
6241 << getSpecialMember(MD), PDiag(),
6242 ImplicitType, SourceLocation(),
6243 SpecifiedType, MD->getLocation());
6244}
6245
6246void Sema::CheckDelayedMemberExceptionSpecs() {
6247 decltype(DelayedExceptionSpecChecks) Checks;
6248 decltype(DelayedDefaultedMemberExceptionSpecs) Specs;
6249
6250 std::swap(Checks, DelayedExceptionSpecChecks);
6251 std::swap(Specs, DelayedDefaultedMemberExceptionSpecs);
6252
6253 // Perform any deferred checking of exception specifications for virtual
6254 // destructors.
6255 for (auto &Check : Checks)
6256 CheckOverridingFunctionExceptionSpec(Check.first, Check.second);
6257
6258 // Check that any explicitly-defaulted methods have exception specifications
6259 // compatible with their implicit exception specifications.
6260 for (auto &Spec : Specs)
6261 CheckExplicitlyDefaultedMemberExceptionSpec(Spec.first, Spec.second);
6262}
6263
6264namespace {
6265struct SpecialMemberDeletionInfo {
6266 Sema &S;
6267 CXXMethodDecl *MD;
6268 Sema::CXXSpecialMember CSM;
6269 Sema::InheritedConstructorInfo *ICI;
6270 bool Diagnose;
6271
6272 // Properties of the special member, computed for convenience.
6273 bool IsConstructor, IsAssignment, IsMove, ConstArg;
6274 SourceLocation Loc;
6275
6276 bool AllFieldsAreConst;
6277
6278 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD,
6279 Sema::CXXSpecialMember CSM,
6280 Sema::InheritedConstructorInfo *ICI, bool Diagnose)
6281 : S(S), MD(MD), CSM(CSM), ICI(ICI), Diagnose(Diagnose),
6282 IsConstructor(false), IsAssignment(false), IsMove(false),
6283 ConstArg(false), Loc(MD->getLocation()), AllFieldsAreConst(true) {
6284 switch (CSM) {
6285 case Sema::CXXDefaultConstructor:
6286 case Sema::CXXCopyConstructor:
6287 IsConstructor = true;
6288 break;
6289 case Sema::CXXMoveConstructor:
6290 IsConstructor = true;
6291 IsMove = true;
6292 break;
6293 case Sema::CXXCopyAssignment:
6294 IsAssignment = true;
6295 break;
6296 case Sema::CXXMoveAssignment:
6297 IsAssignment = true;
6298 IsMove = true;
6299 break;
6300 case Sema::CXXDestructor:
6301 break;
6302 case Sema::CXXInvalid:
6303 llvm_unreachable("invalid special member kind")::llvm::llvm_unreachable_internal("invalid special member kind"
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 6303)
;
6304 }
6305
6306 if (MD->getNumParams()) {
6307 if (const ReferenceType *RT =
6308 MD->getParamDecl(0)->getType()->getAs<ReferenceType>())
6309 ConstArg = RT->getPointeeType().isConstQualified();
6310 }
6311 }
6312
6313 bool inUnion() const { return MD->getParent()->isUnion(); }
6314
6315 Sema::CXXSpecialMember getEffectiveCSM() {
6316 return ICI ? Sema::CXXInvalid : CSM;
6317 }
6318
6319 /// Look up the corresponding special member in the given class.
6320 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class,
6321 unsigned Quals, bool IsMutable) {
6322 return lookupCallFromSpecialMember(S, Class, CSM, Quals,
6323 ConstArg && !IsMutable);
6324 }
6325
6326 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject;
6327
6328 bool shouldDeleteForBase(CXXBaseSpecifier *Base);
6329 bool shouldDeleteForField(FieldDecl *FD);
6330 bool shouldDeleteForAllConstMembers();
6331
6332 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj,
6333 unsigned Quals);
6334 bool shouldDeleteForSubobjectCall(Subobject Subobj,
6335 Sema::SpecialMemberOverloadResult *SMOR,
6336 bool IsDtorCallInCtor);
6337
6338 bool isAccessible(Subobject Subobj, CXXMethodDecl *D);
6339};
6340}
6341
6342/// Is the given special member inaccessible when used on the given
6343/// sub-object.
6344bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj,
6345 CXXMethodDecl *target) {
6346 /// If we're operating on a base class, the object type is the
6347 /// type of this special member.
6348 QualType objectTy;
6349 AccessSpecifier access = target->getAccess();
6350 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) {
6351 objectTy = S.Context.getTypeDeclType(MD->getParent());
6352 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access);
6353
6354 // If we're operating on a field, the object type is the type of the field.
6355 } else {
6356 objectTy = S.Context.getTypeDeclType(target->getParent());
6357 }
6358
6359 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy);
6360}
6361
6362/// Check whether we should delete a special member due to the implicit
6363/// definition containing a call to a special member of a subobject.
6364bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall(
6365 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR,
6366 bool IsDtorCallInCtor) {
6367 CXXMethodDecl *Decl = SMOR->getMethod();
6368 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>();
6369
6370 int DiagKind = -1;
6371
6372 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted)
6373 DiagKind = !Decl ? 0 : 1;
6374 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous)
6375 DiagKind = 2;
6376 else if (!isAccessible(Subobj, Decl))
6377 DiagKind = 3;
6378 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() &&
6379 !Decl->isTrivial()) {
6380 // A member of a union must have a trivial corresponding special member.
6381 // As a weird special case, a destructor call from a union's constructor
6382 // must be accessible and non-deleted, but need not be trivial. Such a
6383 // destructor is never actually called, but is semantically checked as
6384 // if it were.
6385 DiagKind = 4;
6386 }
6387
6388 if (DiagKind == -1)
6389 return false;
6390
6391 if (Diagnose) {
6392 if (Field) {
6393 S.Diag(Field->getLocation(),
6394 diag::note_deleted_special_member_class_subobject)
6395 << getEffectiveCSM() << MD->getParent() << /*IsField*/true
6396 << Field << DiagKind << IsDtorCallInCtor;
6397 } else {
6398 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>();
6399 S.Diag(Base->getLocStart(),
6400 diag::note_deleted_special_member_class_subobject)
6401 << getEffectiveCSM() << MD->getParent() << /*IsField*/false
6402 << Base->getType() << DiagKind << IsDtorCallInCtor;
6403 }
6404
6405 if (DiagKind == 1)
6406 S.NoteDeletedFunction(Decl);
6407 // FIXME: Explain inaccessibility if DiagKind == 3.
6408 }
6409
6410 return true;
6411}
6412
6413/// Check whether we should delete a special member function due to having a
6414/// direct or virtual base class or non-static data member of class type M.
6415bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject(
6416 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) {
6417 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>();
6418 bool IsMutable = Field && Field->isMutable();
6419
6420 // C++11 [class.ctor]p5:
6421 // -- any direct or virtual base class, or non-static data member with no
6422 // brace-or-equal-initializer, has class type M (or array thereof) and
6423 // either M has no default constructor or overload resolution as applied
6424 // to M's default constructor results in an ambiguity or in a function
6425 // that is deleted or inaccessible
6426 // C++11 [class.copy]p11, C++11 [class.copy]p23:
6427 // -- a direct or virtual base class B that cannot be copied/moved because
6428 // overload resolution, as applied to B's corresponding special member,
6429 // results in an ambiguity or a function that is deleted or inaccessible
6430 // from the defaulted special member
6431 // C++11 [class.dtor]p5:
6432 // -- any direct or virtual base class [...] has a type with a destructor
6433 // that is deleted or inaccessible
6434 if (!(CSM == Sema::CXXDefaultConstructor &&
6435 Field && Field->hasInClassInitializer()) &&
6436 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals, IsMutable),
6437 false))
6438 return true;
6439
6440 // C++11 [class.ctor]p5, C++11 [class.copy]p11:
6441 // -- any direct or virtual base class or non-static data member has a
6442 // type with a destructor that is deleted or inaccessible
6443 if (IsConstructor) {
6444 Sema::SpecialMemberOverloadResult *SMOR =
6445 S.LookupSpecialMember(Class, Sema::CXXDestructor,
6446 false, false, false, false, false);
6447 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true))
6448 return true;
6449 }
6450
6451 return false;
6452}
6453
6454/// Check whether we should delete a special member function due to the class
6455/// having a particular direct or virtual base class.
6456bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) {
6457 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl();
6458 // If program is correct, BaseClass cannot be null, but if it is, the error
6459 // must be reported elsewhere.
6460 if (!BaseClass)
6461 return false;
6462 // If we have an inheriting constructor, check whether we're calling an
6463 // inherited constructor instead of a default constructor.
6464 if (ICI) {
6465 assert(CSM == Sema::CXXDefaultConstructor)((CSM == Sema::CXXDefaultConstructor) ? static_cast<void>
(0) : __assert_fail ("CSM == Sema::CXXDefaultConstructor", "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 6465, __PRETTY_FUNCTION__))
;
6466 auto *BaseCtor =
6467 ICI->findConstructorForBase(BaseClass, cast<CXXConstructorDecl>(MD)
6468 ->getInheritedConstructor()
6469 .getConstructor())
6470 .first;
6471 if (BaseCtor) {
6472 if (BaseCtor->isDeleted() && Diagnose) {
6473 S.Diag(Base->getLocStart(),
6474 diag::note_deleted_special_member_class_subobject)
6475 << getEffectiveCSM() << MD->getParent() << /*IsField*/false
6476 << Base->getType() << /*Deleted*/1 << /*IsDtorCallInCtor*/false;
6477 S.NoteDeletedFunction(BaseCtor);
6478 }
6479 return BaseCtor->isDeleted();
6480 }
6481 }
6482 return shouldDeleteForClassSubobject(BaseClass, Base, 0);
6483}
6484
6485/// Check whether we should delete a special member function due to the class
6486/// having a particular non-static data member.
6487bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) {
6488 QualType FieldType = S.Context.getBaseElementType(FD->getType());
6489 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl();
6490
6491 if (CSM == Sema::CXXDefaultConstructor) {
6492 // For a default constructor, all references must be initialized in-class
6493 // and, if a union, it must have a non-const member.
6494 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) {
6495 if (Diagnose)
6496 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field)
6497 << !!ICI << MD->getParent() << FD << FieldType << /*Reference*/0;
6498 return true;
6499 }
6500 // C++11 [class.ctor]p5: any non-variant non-static data member of
6501 // const-qualified type (or array thereof) with no
6502 // brace-or-equal-initializer does not have a user-provided default
6503 // constructor.
6504 if (!inUnion() && FieldType.isConstQualified() &&
6505 !FD->hasInClassInitializer() &&
6506 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) {
6507 if (Diagnose)
6508 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field)
6509 << !!ICI << MD->getParent() << FD << FD->getType() << /*Const*/1;
6510 return true;
6511 }
6512
6513 if (inUnion() && !FieldType.isConstQualified())
6514 AllFieldsAreConst = false;
6515 } else if (CSM == Sema::CXXCopyConstructor) {
6516 // For a copy constructor, data members must not be of rvalue reference
6517 // type.
6518 if (FieldType->isRValueReferenceType()) {
6519 if (Diagnose)
6520 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference)
6521 << MD->getParent() << FD << FieldType;
6522 return true;
6523 }
6524 } else if (IsAssignment) {
6525 // For an assignment operator, data members must not be of reference type.
6526 if (FieldType->isReferenceType()) {
6527 if (Diagnose)
6528 S.Diag(FD->getLocation(), diag::note_deleted_assign_field)
6529 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0;
6530 return true;
6531 }
6532 if (!FieldRecord && FieldType.isConstQualified()) {
6533 // C++11 [class.copy]p23:
6534 // -- a non-static data member of const non-class type (or array thereof)
6535 if (Diagnose)
6536 S.Diag(FD->getLocation(), diag::note_deleted_assign_field)
6537 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1;
6538 return true;
6539 }
6540 }
6541
6542 if (FieldRecord) {
6543 // Some additional restrictions exist on the variant members.
6544 if (!inUnion() && FieldRecord->isUnion() &&
6545 FieldRecord->isAnonymousStructOrUnion()) {
6546 bool AllVariantFieldsAreConst = true;
6547
6548 // FIXME: Handle anonymous unions declared within anonymous unions.
6549 for (auto *UI : FieldRecord->fields()) {
6550 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType());
6551
6552 if (!UnionFieldType.isConstQualified())
6553 AllVariantFieldsAreConst = false;
6554
6555 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl();
6556 if (UnionFieldRecord &&
6557 shouldDeleteForClassSubobject(UnionFieldRecord, UI,
6558 UnionFieldType.getCVRQualifiers()))
6559 return true;
6560 }
6561
6562 // At least one member in each anonymous union must be non-const
6563 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst &&
6564 !FieldRecord->field_empty()) {
6565 if (Diagnose)
6566 S.Diag(FieldRecord->getLocation(),
6567 diag::note_deleted_default_ctor_all_const)
6568 << !!ICI << MD->getParent() << /*anonymous union*/1;
6569 return true;
6570 }
6571
6572 // Don't check the implicit member of the anonymous union type.
6573 // This is technically non-conformant, but sanity demands it.
6574 return false;
6575 }
6576
6577 if (shouldDeleteForClassSubobject(FieldRecord, FD,
6578 FieldType.getCVRQualifiers()))
6579 return true;
6580 }
6581
6582 return false;
6583}
6584
6585/// C++11 [class.ctor] p5:
6586/// A defaulted default constructor for a class X is defined as deleted if
6587/// X is a union and all of its variant members are of const-qualified type.
6588bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() {
6589 // This is a silly definition, because it gives an empty union a deleted
6590 // default constructor. Don't do that.
6591 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst) {
6592 bool AnyFields = false;
6593 for (auto *F : MD->getParent()->fields())
6594 if ((AnyFields = !F->isUnnamedBitfield()))
6595 break;
6596 if (!AnyFields)
6597 return false;
6598 if (Diagnose)
6599 S.Diag(MD->getParent()->getLocation(),
6600 diag::note_deleted_default_ctor_all_const)
6601 << !!ICI << MD->getParent() << /*not anonymous union*/0;
6602 return true;
6603 }
6604 return false;
6605}
6606
6607/// Determine whether a defaulted special member function should be defined as
6608/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11,
6609/// C++11 [class.copy]p23, and C++11 [class.dtor]p5.
6610bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM,
6611 InheritedConstructorInfo *ICI,
6612 bool Diagnose) {
6613 if (MD->isInvalidDecl())
6614 return false;
6615 CXXRecordDecl *RD = MD->getParent();
6616 assert(!RD->isDependentType() && "do deletion after instantiation")((!RD->isDependentType() && "do deletion after instantiation"
) ? static_cast<void> (0) : __assert_fail ("!RD->isDependentType() && \"do deletion after instantiation\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 6616, __PRETTY_FUNCTION__))
;
6617 if (!LangOpts.CPlusPlus11 || RD->isInvalidDecl())
6618 return false;
6619
6620 // C++11 [expr.lambda.prim]p19:
6621 // The closure type associated with a lambda-expression has a
6622 // deleted (8.4.3) default constructor and a deleted copy
6623 // assignment operator.
6624 if (RD->isLambda() &&
6625 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) {
6626 if (Diagnose)
6627 Diag(RD->getLocation(), diag::note_lambda_decl);
6628 return true;
6629 }
6630
6631 // For an anonymous struct or union, the copy and assignment special members
6632 // will never be used, so skip the check. For an anonymous union declared at
6633 // namespace scope, the constructor and destructor are used.
6634 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor &&
6635 RD->isAnonymousStructOrUnion())
6636 return false;
6637
6638 // C++11 [class.copy]p7, p18:
6639 // If the class definition declares a move constructor or move assignment
6640 // operator, an implicitly declared copy constructor or copy assignment
6641 // operator is defined as deleted.
6642 if (MD->isImplicit() &&
6643 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) {
6644 CXXMethodDecl *UserDeclaredMove = nullptr;
6645
6646 // In Microsoft mode up to MSVC 2013, a user-declared move only causes the
6647 // deletion of the corresponding copy operation, not both copy operations.
6648 // MSVC 2015 has adopted the standards conforming behavior.
6649 bool DeletesOnlyMatchingCopy =
6650 getLangOpts().MSVCCompat &&
6651 !getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015);
6652
6653 if (RD->hasUserDeclaredMoveConstructor() &&
6654 (!DeletesOnlyMatchingCopy || CSM == CXXCopyConstructor)) {
6655 if (!Diagnose) return true;
6656
6657 // Find any user-declared move constructor.
6658 for (auto *I : RD->ctors()) {
6659 if (I->isMoveConstructor()) {
6660 UserDeclaredMove = I;
6661 break;
6662 }
6663 }
6664 assert(UserDeclaredMove)((UserDeclaredMove) ? static_cast<void> (0) : __assert_fail
("UserDeclaredMove", "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 6664, __PRETTY_FUNCTION__))
;
6665 } else if (RD->hasUserDeclaredMoveAssignment() &&
6666 (!DeletesOnlyMatchingCopy || CSM == CXXCopyAssignment)) {
6667 if (!Diagnose) return true;
6668
6669 // Find any user-declared move assignment operator.
6670 for (auto *I : RD->methods()) {
6671 if (I->isMoveAssignmentOperator()) {
6672 UserDeclaredMove = I;
6673 break;
6674 }
6675 }
6676 assert(UserDeclaredMove)((UserDeclaredMove) ? static_cast<void> (0) : __assert_fail
("UserDeclaredMove", "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 6676, __PRETTY_FUNCTION__))
;
6677 }
6678
6679 if (UserDeclaredMove) {
6680 Diag(UserDeclaredMove->getLocation(),
6681 diag::note_deleted_copy_user_declared_move)
6682 << (CSM == CXXCopyAssignment) << RD
6683 << UserDeclaredMove->isMoveAssignmentOperator();
6684 return true;
6685 }
6686 }
6687
6688 // Do access control from the special member function
6689 ContextRAII MethodContext(*this, MD);
6690
6691 // C++11 [class.dtor]p5:
6692 // -- for a virtual destructor, lookup of the non-array deallocation function
6693 // results in an ambiguity or in a function that is deleted or inaccessible
6694 if (CSM == CXXDestructor && MD->isVirtual()) {
6695 FunctionDecl *OperatorDelete = nullptr;
6696 DeclarationName Name =
6697 Context.DeclarationNames.getCXXOperatorName(OO_Delete);
6698 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name,
6699 OperatorDelete, /*Diagnose*/false)) {
6700 if (Diagnose)
6701 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete);
6702 return true;
6703 }
6704 }
6705
6706 SpecialMemberDeletionInfo SMI(*this, MD, CSM, ICI, Diagnose);
6707
6708 for (auto &BI : RD->bases())
6709 if ((SMI.IsAssignment || !BI.isVirtual()) &&
6710 SMI.shouldDeleteForBase(&BI))
6711 return true;
6712
6713 // Per DR1611, do not consider virtual bases of constructors of abstract
6714 // classes, since we are not going to construct them. For assignment
6715 // operators, we only assign (and thus only consider) direct bases.
6716 if ((!RD->isAbstract() || !SMI.IsConstructor) && !SMI.IsAssignment) {
6717 for (auto &BI : RD->vbases())
6718 if (SMI.shouldDeleteForBase(&BI))
6719 return true;
6720 }
6721
6722 for (auto *FI : RD->fields())
6723 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() &&
6724 SMI.shouldDeleteForField(FI))
6725 return true;
6726
6727 if (SMI.shouldDeleteForAllConstMembers())
6728 return true;
6729
6730 if (getLangOpts().CUDA) {
6731 // We should delete the special member in CUDA mode if target inference
6732 // failed.
6733 return inferCUDATargetForImplicitSpecialMember(RD, CSM, MD, SMI.ConstArg,
6734 Diagnose);
6735 }
6736
6737 return false;
6738}
6739
6740/// Perform lookup for a special member of the specified kind, and determine
6741/// whether it is trivial. If the triviality can be determined without the
6742/// lookup, skip it. This is intended for use when determining whether a
6743/// special member of a containing object is trivial, and thus does not ever
6744/// perform overload resolution for default constructors.
6745///
6746/// If \p Selected is not \c NULL, \c *Selected will be filled in with the
6747/// member that was most likely to be intended to be trivial, if any.
6748static bool findTrivialSpecialMember(Sema &S, CXXRecordDecl *RD,
6749 Sema::CXXSpecialMember CSM, unsigned Quals,
6750 bool ConstRHS, CXXMethodDecl **Selected) {
6751 if (Selected)
6752 *Selected = nullptr;
6753
6754 switch (CSM) {
6755 case Sema::CXXInvalid:
6756 llvm_unreachable("not a special member")::llvm::llvm_unreachable_internal("not a special member", "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 6756)
;
6757
6758 case Sema::CXXDefaultConstructor:
6759 // C++11 [class.ctor]p5:
6760 // A default constructor is trivial if:
6761 // - all the [direct subobjects] have trivial default constructors
6762 //
6763 // Note, no overload resolution is performed in this case.
6764 if (RD->hasTrivialDefaultConstructor())
6765 return true;
6766
6767 if (Selected) {
6768 // If there's a default constructor which could have been trivial, dig it
6769 // out. Otherwise, if there's any user-provided default constructor, point
6770 // to that as an example of why there's not a trivial one.
6771 CXXConstructorDecl *DefCtor = nullptr;
6772 if (RD->needsImplicitDefaultConstructor())
6773 S.DeclareImplicitDefaultConstructor(RD);
6774 for (auto *CI : RD->ctors()) {
6775 if (!CI->isDefaultConstructor())
6776 continue;
6777 DefCtor = CI;
6778 if (!DefCtor->isUserProvided())
6779 break;
6780 }
6781
6782 *Selected = DefCtor;
6783 }
6784
6785 return false;
6786
6787 case Sema::CXXDestructor:
6788 // C++11 [class.dtor]p5:
6789 // A destructor is trivial if:
6790 // - all the direct [subobjects] have trivial destructors
6791 if (RD->hasTrivialDestructor())
6792 return true;
6793
6794 if (Selected) {
6795 if (RD->needsImplicitDestructor())
6796 S.DeclareImplicitDestructor(RD);
6797 *Selected = RD->getDestructor();
6798 }
6799
6800 return false;
6801
6802 case Sema::CXXCopyConstructor:
6803 // C++11 [class.copy]p12:
6804 // A copy constructor is trivial if:
6805 // - the constructor selected to copy each direct [subobject] is trivial
6806 if (RD->hasTrivialCopyConstructor()) {
6807 if (Quals == Qualifiers::Const)
6808 // We must either select the trivial copy constructor or reach an
6809 // ambiguity; no need to actually perform overload resolution.
6810 return true;
6811 } else if (!Selected) {
6812 return false;
6813 }
6814 // In C++98, we are not supposed to perform overload resolution here, but we
6815 // treat that as a language defect, as suggested on cxx-abi-dev, to treat
6816 // cases like B as having a non-trivial copy constructor:
6817 // struct A { template<typename T> A(T&); };
6818 // struct B { mutable A a; };
6819 goto NeedOverloadResolution;
6820
6821 case Sema::CXXCopyAssignment:
6822 // C++11 [class.copy]p25:
6823 // A copy assignment operator is trivial if:
6824 // - the assignment operator selected to copy each direct [subobject] is
6825 // trivial
6826 if (RD->hasTrivialCopyAssignment()) {
6827 if (Quals == Qualifiers::Const)
6828 return true;
6829 } else if (!Selected) {
6830 return false;
6831 }
6832 // In C++98, we are not supposed to perform overload resolution here, but we
6833 // treat that as a language defect.
6834 goto NeedOverloadResolution;
6835
6836 case Sema::CXXMoveConstructor:
6837 case Sema::CXXMoveAssignment:
6838 NeedOverloadResolution:
6839 Sema::SpecialMemberOverloadResult *SMOR =
6840 lookupCallFromSpecialMember(S, RD, CSM, Quals, ConstRHS);
6841
6842 // The standard doesn't describe how to behave if the lookup is ambiguous.
6843 // We treat it as not making the member non-trivial, just like the standard
6844 // mandates for the default constructor. This should rarely matter, because
6845 // the member will also be deleted.
6846 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous)
6847 return true;
6848
6849 if (!SMOR->getMethod()) {
6850 assert(SMOR->getKind() ==((SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted
) ? static_cast<void> (0) : __assert_fail ("SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted"
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 6851, __PRETTY_FUNCTION__))
6851 Sema::SpecialMemberOverloadResult::NoMemberOrDeleted)((SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted
) ? static_cast<void> (0) : __assert_fail ("SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted"
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 6851, __PRETTY_FUNCTION__))
;
6852 return false;
6853 }
6854
6855 // We deliberately don't check if we found a deleted special member. We're
6856 // not supposed to!
6857 if (Selected)
6858 *Selected = SMOR->getMethod();
6859 return SMOR->getMethod()->isTrivial();
6860 }
6861
6862 llvm_unreachable("unknown special method kind")::llvm::llvm_unreachable_internal("unknown special method kind"
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 6862)
;
6863}
6864
6865static CXXConstructorDecl *findUserDeclaredCtor(CXXRecordDecl *RD) {
6866 for (auto *CI : RD->ctors())
6867 if (!CI->isImplicit())
6868 return CI;
6869
6870 // Look for constructor templates.
6871 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> tmpl_iter;
6872 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); TI != TE; ++TI) {
6873 if (CXXConstructorDecl *CD =
6874 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl()))
6875 return CD;
6876 }
6877
6878 return nullptr;
6879}
6880
6881/// The kind of subobject we are checking for triviality. The values of this
6882/// enumeration are used in diagnostics.
6883enum TrivialSubobjectKind {
6884 /// The subobject is a base class.
6885 TSK_BaseClass,
6886 /// The subobject is a non-static data member.
6887 TSK_Field,
6888 /// The object is actually the complete object.
6889 TSK_CompleteObject
6890};
6891
6892/// Check whether the special member selected for a given type would be trivial.
6893static bool checkTrivialSubobjectCall(Sema &S, SourceLocation SubobjLoc,
6894 QualType SubType, bool ConstRHS,
6895 Sema::CXXSpecialMember CSM,
6896 TrivialSubobjectKind Kind,
6897 bool Diagnose) {
6898 CXXRecordDecl *SubRD = SubType->getAsCXXRecordDecl();
6899 if (!SubRD)
6900 return true;
6901
6902 CXXMethodDecl *Selected;
6903 if (findTrivialSpecialMember(S, SubRD, CSM, SubType.getCVRQualifiers(),
6904 ConstRHS, Diagnose ? &Selected : nullptr))
6905 return true;
6906
6907 if (Diagnose) {
6908 if (ConstRHS)
6909 SubType.addConst();
6910
6911 if (!Selected && CSM == Sema::CXXDefaultConstructor) {
6912 S.Diag(SubobjLoc, diag::note_nontrivial_no_def_ctor)
6913 << Kind << SubType.getUnqualifiedType();
6914 if (CXXConstructorDecl *CD = findUserDeclaredCtor(SubRD))
6915 S.Diag(CD->getLocation(), diag::note_user_declared_ctor);
6916 } else if (!Selected)
6917 S.Diag(SubobjLoc, diag::note_nontrivial_no_copy)
6918 << Kind << SubType.getUnqualifiedType() << CSM << SubType;
6919 else if (Selected->isUserProvided()) {
6920 if (Kind == TSK_CompleteObject)
6921 S.Diag(Selected->getLocation(), diag::note_nontrivial_user_provided)
6922 << Kind << SubType.getUnqualifiedType() << CSM;
6923 else {
6924 S.Diag(SubobjLoc, diag::note_nontrivial_user_provided)
6925 << Kind << SubType.getUnqualifiedType() << CSM;
6926 S.Diag(Selected->getLocation(), diag::note_declared_at);
6927 }
6928 } else {
6929 if (Kind != TSK_CompleteObject)
6930 S.Diag(SubobjLoc, diag::note_nontrivial_subobject)
6931 << Kind << SubType.getUnqualifiedType() << CSM;
6932
6933 // Explain why the defaulted or deleted special member isn't trivial.
6934 S.SpecialMemberIsTrivial(Selected, CSM, Diagnose);
6935 }
6936 }
6937
6938 return false;
6939}
6940
6941/// Check whether the members of a class type allow a special member to be
6942/// trivial.
6943static bool checkTrivialClassMembers(Sema &S, CXXRecordDecl *RD,
6944 Sema::CXXSpecialMember CSM,
6945 bool ConstArg, bool Diagnose) {
6946 for (const auto *FI : RD->fields()) {
6947 if (FI->isInvalidDecl() || FI->isUnnamedBitfield())
6948 continue;
6949
6950 QualType FieldType = S.Context.getBaseElementType(FI->getType());
6951
6952 // Pretend anonymous struct or union members are members of this class.
6953 if (FI->isAnonymousStructOrUnion()) {
6954 if (!checkTrivialClassMembers(S, FieldType->getAsCXXRecordDecl(),
6955 CSM, ConstArg, Diagnose))
6956 return false;
6957 continue;
6958 }
6959
6960 // C++11 [class.ctor]p5:
6961 // A default constructor is trivial if [...]
6962 // -- no non-static data member of its class has a
6963 // brace-or-equal-initializer
6964 if (CSM == Sema::CXXDefaultConstructor && FI->hasInClassInitializer()) {
6965 if (Diagnose)
6966 S.Diag(FI->getLocation(), diag::note_nontrivial_in_class_init) << FI;
6967 return false;
6968 }
6969
6970 // Objective C ARC 4.3.5:
6971 // [...] nontrivally ownership-qualified types are [...] not trivially
6972 // default constructible, copy constructible, move constructible, copy
6973 // assignable, move assignable, or destructible [...]
6974 if (S.getLangOpts().ObjCAutoRefCount &&
6975 FieldType.hasNonTrivialObjCLifetime()) {
6976 if (Diagnose)
6977 S.Diag(FI->getLocation(), diag::note_nontrivial_objc_ownership)
6978 << RD << FieldType.getObjCLifetime();
6979 return false;
6980 }
6981
6982 bool ConstRHS = ConstArg && !FI->isMutable();
6983 if (!checkTrivialSubobjectCall(S, FI->getLocation(), FieldType, ConstRHS,
6984 CSM, TSK_Field, Diagnose))
6985 return false;
6986 }
6987
6988 return true;
6989}
6990
6991/// Diagnose why the specified class does not have a trivial special member of
6992/// the given kind.
6993void Sema::DiagnoseNontrivial(const CXXRecordDecl *RD, CXXSpecialMember CSM) {
6994 QualType Ty = Context.getRecordType(RD);
6995
6996 bool ConstArg = (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment);
6997 checkTrivialSubobjectCall(*this, RD->getLocation(), Ty, ConstArg, CSM,
6998 TSK_CompleteObject, /*Diagnose*/true);
6999}
7000
7001/// Determine whether a defaulted or deleted special member function is trivial,
7002/// as specified in C++11 [class.ctor]p5, C++11 [class.copy]p12,
7003/// C++11 [class.copy]p25, and C++11 [class.dtor]p5.
7004bool Sema::SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM,
7005 bool Diagnose) {
7006 assert(!MD->isUserProvided() && CSM != CXXInvalid && "not special enough")((!MD->isUserProvided() && CSM != CXXInvalid &&
"not special enough") ? static_cast<void> (0) : __assert_fail
("!MD->isUserProvided() && CSM != CXXInvalid && \"not special enough\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 7006, __PRETTY_FUNCTION__))
;
7007
7008 CXXRecordDecl *RD = MD->getParent();
7009
7010 bool ConstArg = false;
7011
7012 // C++11 [class.copy]p12, p25: [DR1593]
7013 // A [special member] is trivial if [...] its parameter-type-list is
7014 // equivalent to the parameter-type-list of an implicit declaration [...]
7015 switch (CSM) {
7016 case CXXDefaultConstructor:
7017 case CXXDestructor:
7018 // Trivial default constructors and destructors cannot have parameters.
7019 break;
7020
7021 case CXXCopyConstructor:
7022 case CXXCopyAssignment: {
7023 // Trivial copy operations always have const, non-volatile parameter types.
7024 ConstArg = true;
7025 const ParmVarDecl *Param0 = MD->getParamDecl(0);
7026 const ReferenceType *RT = Param0->getType()->getAs<ReferenceType>();
7027 if (!RT || RT->getPointeeType().getCVRQualifiers() != Qualifiers::Const) {
7028 if (Diagnose)
7029 Diag(Param0->getLocation(), diag::note_nontrivial_param_type)
7030 << Param0->getSourceRange() << Param0->getType()
7031 << Context.getLValueReferenceType(
7032 Context.getRecordType(RD).withConst());
7033 return false;
7034 }
7035 break;
7036 }
7037
7038 case CXXMoveConstructor:
7039 case CXXMoveAssignment: {
7040 // Trivial move operations always have non-cv-qualified parameters.
7041 const ParmVarDecl *Param0 = MD->getParamDecl(0);
7042 const RValueReferenceType *RT =
7043 Param0->getType()->getAs<RValueReferenceType>();
7044 if (!RT || RT->getPointeeType().getCVRQualifiers()) {
7045 if (Diagnose)
7046 Diag(Param0->getLocation(), diag::note_nontrivial_param_type)
7047 << Param0->getSourceRange() << Param0->getType()
7048 << Context.getRValueReferenceType(Context.getRecordType(RD));
7049 return false;
7050 }
7051 break;
7052 }
7053
7054 case CXXInvalid:
7055 llvm_unreachable("not a special member")::llvm::llvm_unreachable_internal("not a special member", "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 7055)
;
7056 }
7057
7058 if (MD->getMinRequiredArguments() < MD->getNumParams()) {
7059 if (Diagnose)
7060 Diag(MD->getParamDecl(MD->getMinRequiredArguments())->getLocation(),
7061 diag::note_nontrivial_default_arg)
7062 << MD->getParamDecl(MD->getMinRequiredArguments())->getSourceRange();
7063 return false;
7064 }
7065 if (MD->isVariadic()) {
7066 if (Diagnose)
7067 Diag(MD->getLocation(), diag::note_nontrivial_variadic);
7068 return false;
7069 }
7070
7071 // C++11 [class.ctor]p5, C++11 [class.dtor]p5:
7072 // A copy/move [constructor or assignment operator] is trivial if
7073 // -- the [member] selected to copy/move each direct base class subobject
7074 // is trivial
7075 //
7076 // C++11 [class.copy]p12, C++11 [class.copy]p25:
7077 // A [default constructor or destructor] is trivial if
7078 // -- all the direct base classes have trivial [default constructors or
7079 // destructors]
7080 for (const auto &BI : RD->bases())
7081 if (!checkTrivialSubobjectCall(*this, BI.getLocStart(), BI.getType(),
7082 ConstArg, CSM, TSK_BaseClass, Diagnose))
7083 return false;
7084
7085 // C++11 [class.ctor]p5, C++11 [class.dtor]p5:
7086 // A copy/move [constructor or assignment operator] for a class X is
7087 // trivial if
7088 // -- for each non-static data member of X that is of class type (or array
7089 // thereof), the constructor selected to copy/move that member is
7090 // trivial
7091 //
7092 // C++11 [class.copy]p12, C++11 [class.copy]p25:
7093 // A [default constructor or destructor] is trivial if
7094 // -- for all of the non-static data members of its class that are of class
7095 // type (or array thereof), each such class has a trivial [default
7096 // constructor or destructor]
7097 if (!checkTrivialClassMembers(*this, RD, CSM, ConstArg, Diagnose))
7098 return false;
7099
7100 // C++11 [class.dtor]p5:
7101 // A destructor is trivial if [...]
7102 // -- the destructor is not virtual
7103 if (CSM == CXXDestructor && MD->isVirtual()) {
7104 if (Diagnose)
7105 Diag(MD->getLocation(), diag::note_nontrivial_virtual_dtor) << RD;
7106 return false;
7107 }
7108
7109 // C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25:
7110 // A [special member] for class X is trivial if [...]
7111 // -- class X has no virtual functions and no virtual base classes
7112 if (CSM != CXXDestructor && MD->getParent()->isDynamicClass()) {
7113 if (!Diagnose)
7114 return false;
7115
7116 if (RD->getNumVBases()) {
7117 // Check for virtual bases. We already know that the corresponding
7118 // member in all bases is trivial, so vbases must all be direct.
7119 CXXBaseSpecifier &BS = *RD->vbases_begin();
7120 assert(BS.isVirtual())((BS.isVirtual()) ? static_cast<void> (0) : __assert_fail
("BS.isVirtual()", "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 7120, __PRETTY_FUNCTION__))
;
7121 Diag(BS.getLocStart(), diag::note_nontrivial_has_virtual) << RD << 1;
7122 return false;
7123 }
7124
7125 // Must have a virtual method.
7126 for (const auto *MI : RD->methods()) {
7127 if (MI->isVirtual()) {
7128 SourceLocation MLoc = MI->getLocStart();
7129 Diag(MLoc, diag::note_nontrivial_has_virtual) << RD << 0;
7130 return false;
7131 }
7132 }
7133
7134 llvm_unreachable("dynamic class with no vbases and no virtual functions")::llvm::llvm_unreachable_internal("dynamic class with no vbases and no virtual functions"
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 7134)
;
7135 }
7136
7137 // Looks like it's trivial!
7138 return true;
7139}
7140
7141namespace {
7142struct FindHiddenVirtualMethod {
7143 Sema *S;
7144 CXXMethodDecl *Method;
7145 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods;
7146 SmallVector<CXXMethodDecl *, 8> OverloadedMethods;
7147
7148private:
7149 /// Check whether any most overriden method from MD in Methods
7150 static bool CheckMostOverridenMethods(
7151 const CXXMethodDecl *MD,
7152 const llvm::SmallPtrSetImpl<const CXXMethodDecl *> &Methods) {
7153 if (MD->size_overridden_methods() == 0)
7154 return Methods.count(MD->getCanonicalDecl());
7155 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(),
7156 E = MD->end_overridden_methods();
7157 I != E; ++I)
7158 if (CheckMostOverridenMethods(*I, Methods))
7159 return true;
7160 return false;
7161 }
7162
7163public:
7164 /// Member lookup function that determines whether a given C++
7165 /// method overloads virtual methods in a base class without overriding any,
7166 /// to be used with CXXRecordDecl::lookupInBases().
7167 bool operator()(const CXXBaseSpecifier *Specifier, CXXBasePath &Path) {
7168 RecordDecl *BaseRecord =
7169 Specifier->getType()->getAs<RecordType>()->getDecl();
7170
7171 DeclarationName Name = Method->getDeclName();
7172 assert(Name.getNameKind() == DeclarationName::Identifier)((Name.getNameKind() == DeclarationName::Identifier) ? static_cast
<void> (0) : __assert_fail ("Name.getNameKind() == DeclarationName::Identifier"
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 7172, __PRETTY_FUNCTION__))
;
7173
7174 bool foundSameNameMethod = false;
7175 SmallVector<CXXMethodDecl *, 8> overloadedMethods;
7176 for (Path.Decls = BaseRecord->lookup(Name); !Path.Decls.empty();
7177 Path.Decls = Path.Decls.slice(1)) {
7178 NamedDecl *D = Path.Decls.front();
7179 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) {
7180 MD = MD->getCanonicalDecl();
7181 foundSameNameMethod = true;
7182 // Interested only in hidden virtual methods.
7183 if (!MD->isVirtual())
7184 continue;
7185 // If the method we are checking overrides a method from its base
7186 // don't warn about the other overloaded methods. Clang deviates from
7187 // GCC by only diagnosing overloads of inherited virtual functions that
7188 // do not override any other virtual functions in the base. GCC's
7189 // -Woverloaded-virtual diagnoses any derived function hiding a virtual
7190 // function from a base class. These cases may be better served by a
7191 // warning (not specific to virtual functions) on call sites when the
7192 // call would select a different function from the base class, were it
7193 // visible.
7194 // See FIXME in test/SemaCXX/warn-overload-virtual.cpp for an example.
7195 if (!S->IsOverload(Method, MD, false))
7196 return true;
7197 // Collect the overload only if its hidden.
7198 if (!CheckMostOverridenMethods(MD, OverridenAndUsingBaseMethods))
7199 overloadedMethods.push_back(MD);
7200 }
7201 }
7202
7203 if (foundSameNameMethod)
7204 OverloadedMethods.append(overloadedMethods.begin(),
7205 overloadedMethods.end());
7206 return foundSameNameMethod;
7207 }
7208};
7209} // end anonymous namespace
7210
7211/// \brief Add the most overriden methods from MD to Methods
7212static void AddMostOverridenMethods(const CXXMethodDecl *MD,
7213 llvm::SmallPtrSetImpl<const CXXMethodDecl *>& Methods) {
7214 if (MD->size_overridden_methods() == 0)
7215 Methods.insert(MD->getCanonicalDecl());
7216 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(),
7217 E = MD->end_overridden_methods();
7218 I != E; ++I)
7219 AddMostOverridenMethods(*I, Methods);
7220}
7221
7222/// \brief Check if a method overloads virtual methods in a base class without
7223/// overriding any.
7224void Sema::FindHiddenVirtualMethods(CXXMethodDecl *MD,
7225 SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods) {
7226 if (!MD->getDeclName().isIdentifier())
7227 return;
7228
7229 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases.
7230 /*bool RecordPaths=*/false,
7231 /*bool DetectVirtual=*/false);
7232 FindHiddenVirtualMethod FHVM;
7233 FHVM.Method = MD;
7234 FHVM.S = this;
7235
7236 // Keep the base methods that were overriden or introduced in the subclass
7237 // by 'using' in a set. A base method not in this set is hidden.
7238 CXXRecordDecl *DC = MD->getParent();
7239 DeclContext::lookup_result R = DC->lookup(MD->getDeclName());
7240 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; ++I) {
7241 NamedDecl *ND = *I;
7242 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*I))
7243 ND = shad->getTargetDecl();
7244 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND))
7245 AddMostOverridenMethods(MD, FHVM.OverridenAndUsingBaseMethods);
7246 }
7247
7248 if (DC->lookupInBases(FHVM, Paths))
7249 OverloadedMethods = FHVM.OverloadedMethods;
7250}
7251
7252void Sema::NoteHiddenVirtualMethods(CXXMethodDecl *MD,
7253 SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods) {
7254 for (unsigned i = 0, e = OverloadedMethods.size(); i != e; ++i) {
7255 CXXMethodDecl *overloadedMD = OverloadedMethods[i];
7256 PartialDiagnostic PD = PDiag(
7257 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD;
7258 HandleFunctionTypeMismatch(PD, MD->getType(), overloadedMD->getType());
7259 Diag(overloadedMD->getLocation(), PD);
7260 }
7261}
7262
7263/// \brief Diagnose methods which overload virtual methods in a base class
7264/// without overriding any.
7265void Sema::DiagnoseHiddenVirtualMethods(CXXMethodDecl *MD) {
7266 if (MD->isInvalidDecl())
7267 return;
7268
7269 if (Diags.isIgnored(diag::warn_overloaded_virtual, MD->getLocation()))
7270 return;
7271
7272 SmallVector<CXXMethodDecl *, 8> OverloadedMethods;
7273 FindHiddenVirtualMethods(MD, OverloadedMethods);
7274 if (!OverloadedMethods.empty()) {
7275 Diag(MD->getLocation(), diag::warn_overloaded_virtual)
7276 << MD << (OverloadedMethods.size() > 1);
7277
7278 NoteHiddenVirtualMethods(MD, OverloadedMethods);
7279 }
7280}
7281
7282void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc,
7283 Decl *TagDecl,
7284 SourceLocation LBrac,
7285 SourceLocation RBrac,
7286 AttributeList *AttrList) {
7287 if (!TagDecl)
7288 return;
7289
7290 AdjustDeclIfTemplate(TagDecl);
7291
7292 for (const AttributeList* l = AttrList; l; l = l->getNext()) {
7293 if (l->getKind() != AttributeList::AT_Visibility)
7294 continue;
7295 l->setInvalid();
7296 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) <<
7297 l->getName();
7298 }
7299
7300 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef(
7301 // strict aliasing violation!
7302 reinterpret_cast<Decl**>(FieldCollector->getCurFields()),
7303 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList);
7304
7305 CheckCompletedCXXClass(
7306 dyn_cast_or_null<CXXRecordDecl>(TagDecl));
7307}
7308
7309/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared
7310/// special functions, such as the default constructor, copy
7311/// constructor, or destructor, to the given C++ class (C++
7312/// [special]p1). This routine can only be executed just before the
7313/// definition of the class is complete.
7314void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) {
7315 if (ClassDecl->needsImplicitDefaultConstructor()) {
7316 ++ASTContext::NumImplicitDefaultConstructors;
7317
7318 if (ClassDecl->hasInheritedConstructor())
7319 DeclareImplicitDefaultConstructor(ClassDecl);
7320 }
7321
7322 if (ClassDecl->needsImplicitCopyConstructor()) {
7323 ++ASTContext::NumImplicitCopyConstructors;
7324
7325 // If the properties or semantics of the copy constructor couldn't be
7326 // determined while the class was being declared, force a declaration
7327 // of it now.
7328 if (ClassDecl->needsOverloadResolutionForCopyConstructor() ||
7329 ClassDecl->hasInheritedConstructor())
7330 DeclareImplicitCopyConstructor(ClassDecl);
7331 // For the MS ABI we need to know whether the copy ctor is deleted. A
7332 // prerequisite for deleting the implicit copy ctor is that the class has a
7333 // move ctor or move assignment that is either user-declared or whose
7334 // semantics are inherited from a subobject. FIXME: We should provide a more
7335 // direct way for CodeGen to ask whether the constructor was deleted.
7336 else if (Context.getTargetInfo().getCXXABI().isMicrosoft() &&
7337 (ClassDecl->hasUserDeclaredMoveConstructor() ||
7338 ClassDecl->needsOverloadResolutionForMoveConstructor() ||
7339 ClassDecl->hasUserDeclaredMoveAssignment() ||
7340 ClassDecl->needsOverloadResolutionForMoveAssignment()))
7341 DeclareImplicitCopyConstructor(ClassDecl);
7342 }
7343
7344 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveConstructor()) {
7345 ++ASTContext::NumImplicitMoveConstructors;
7346
7347 if (ClassDecl->needsOverloadResolutionForMoveConstructor() ||
7348 ClassDecl->hasInheritedConstructor())
7349 DeclareImplicitMoveConstructor(ClassDecl);
7350 }
7351
7352 if (ClassDecl->needsImplicitCopyAssignment()) {
7353 ++ASTContext::NumImplicitCopyAssignmentOperators;
7354
7355 // If we have a dynamic class, then the copy assignment operator may be
7356 // virtual, so we have to declare it immediately. This ensures that, e.g.,
7357 // it shows up in the right place in the vtable and that we diagnose
7358 // problems with the implicit exception specification.
7359 if (ClassDecl->isDynamicClass() ||
7360 ClassDecl->needsOverloadResolutionForCopyAssignment() ||
7361 ClassDecl->hasInheritedAssignment())
7362 DeclareImplicitCopyAssignment(ClassDecl);
7363 }
7364
7365 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveAssignment()) {
7366 ++ASTContext::NumImplicitMoveAssignmentOperators;
7367
7368 // Likewise for the move assignment operator.
7369 if (ClassDecl->isDynamicClass() ||
7370 ClassDecl->needsOverloadResolutionForMoveAssignment() ||
7371 ClassDecl->hasInheritedAssignment())
7372 DeclareImplicitMoveAssignment(ClassDecl);
7373 }
7374
7375 if (ClassDecl->needsImplicitDestructor()) {
7376 ++ASTContext::NumImplicitDestructors;
7377
7378 // If we have a dynamic class, then the destructor may be virtual, so we
7379 // have to declare the destructor immediately. This ensures that, e.g., it
7380 // shows up in the right place in the vtable and that we diagnose problems
7381 // with the implicit exception specification.
7382 if (ClassDecl->isDynamicClass() ||
7383 ClassDecl->needsOverloadResolutionForDestructor())
7384 DeclareImplicitDestructor(ClassDecl);
7385 }
7386}
7387
7388unsigned Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) {
7389 if (!D)
7390 return 0;
7391
7392 // The order of template parameters is not important here. All names
7393 // get added to the same scope.
7394 SmallVector<TemplateParameterList *, 4> ParameterLists;
7395
7396 if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D))
7397 D = TD->getTemplatedDecl();
7398
7399 if (auto *PSD = dyn_cast<ClassTemplatePartialSpecializationDecl>(D))
7400 ParameterLists.push_back(PSD->getTemplateParameters());
7401
7402 if (DeclaratorDecl *DD = dyn_cast<DeclaratorDecl>(D)) {
7403 for (unsigned i = 0; i < DD->getNumTemplateParameterLists(); ++i)
7404 ParameterLists.push_back(DD->getTemplateParameterList(i));
7405
7406 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
7407 if (FunctionTemplateDecl *FTD = FD->getDescribedFunctionTemplate())
7408 ParameterLists.push_back(FTD->getTemplateParameters());
7409 }
7410 }
7411
7412 if (TagDecl *TD = dyn_cast<TagDecl>(D)) {
7413 for (unsigned i = 0; i < TD->getNumTemplateParameterLists(); ++i)
7414 ParameterLists.push_back(TD->getTemplateParameterList(i));
7415
7416 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(TD)) {
7417 if (ClassTemplateDecl *CTD = RD->getDescribedClassTemplate())
7418 ParameterLists.push_back(CTD->getTemplateParameters());
7419 }
7420 }
7421
7422 unsigned Count = 0;
7423 for (TemplateParameterList *Params : ParameterLists) {
7424 if (Params->size() > 0)
7425 // Ignore explicit specializations; they don't contribute to the template
7426 // depth.
7427 ++Count;
7428 for (NamedDecl *Param : *Params) {
7429 if (Param->getDeclName()) {
7430 S->AddDecl(Param);
7431 IdResolver.AddDecl(Param);
7432 }
7433 }
7434 }
7435
7436 return Count;
7437}
7438
7439void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) {
7440 if (!RecordD) return;
7441 AdjustDeclIfTemplate(RecordD);
7442 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD);
7443 PushDeclContext(S, Record);
7444}
7445
7446void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) {
7447 if (!RecordD) return;
7448 PopDeclContext();
7449}
7450
7451/// This is used to implement the constant expression evaluation part of the
7452/// attribute enable_if extension. There is nothing in standard C++ which would
7453/// require reentering parameters.
7454void Sema::ActOnReenterCXXMethodParameter(Scope *S, ParmVarDecl *Param) {
7455 if (!Param)
7456 return;
7457
7458 S->AddDecl(Param);
7459 if (Param->getDeclName())
7460 IdResolver.AddDecl(Param);
7461}
7462
7463/// ActOnStartDelayedCXXMethodDeclaration - We have completed
7464/// parsing a top-level (non-nested) C++ class, and we are now
7465/// parsing those parts of the given Method declaration that could
7466/// not be parsed earlier (C++ [class.mem]p2), such as default
7467/// arguments. This action should enter the scope of the given
7468/// Method declaration as if we had just parsed the qualified method
7469/// name. However, it should not bring the parameters into scope;
7470/// that will be performed by ActOnDelayedCXXMethodParameter.
7471void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) {
7472}
7473
7474/// ActOnDelayedCXXMethodParameter - We've already started a delayed
7475/// C++ method declaration. We're (re-)introducing the given
7476/// function parameter into scope for use in parsing later parts of
7477/// the method declaration. For example, we could see an
7478/// ActOnParamDefaultArgument event for this parameter.
7479void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) {
7480 if (!ParamD)
7481 return;
7482
7483 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD);
7484
7485 // If this parameter has an unparsed default argument, clear it out
7486 // to make way for the parsed default argument.
7487 if (Param->hasUnparsedDefaultArg())
7488 Param->setDefaultArg(nullptr);
7489
7490 S->AddDecl(Param);
7491 if (Param->getDeclName())
7492 IdResolver.AddDecl(Param);
7493}
7494
7495/// ActOnFinishDelayedCXXMethodDeclaration - We have finished
7496/// processing the delayed method declaration for Method. The method
7497/// declaration is now considered finished. There may be a separate
7498/// ActOnStartOfFunctionDef action later (not necessarily
7499/// immediately!) for this method, if it was also defined inside the
7500/// class body.
7501void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) {
7502 if (!MethodD)
7503 return;
7504
7505 AdjustDeclIfTemplate(MethodD);
7506
7507 FunctionDecl *Method = cast<FunctionDecl>(MethodD);
7508
7509 // Now that we have our default arguments, check the constructor
7510 // again. It could produce additional diagnostics or affect whether
7511 // the class has implicitly-declared destructors, among other
7512 // things.
7513 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method))
7514 CheckConstructor(Constructor);
7515
7516 // Check the default arguments, which we may have added.
7517 if (!Method->isInvalidDecl())
7518 CheckCXXDefaultArguments(Method);
7519}
7520
7521/// CheckConstructorDeclarator - Called by ActOnDeclarator to check
7522/// the well-formedness of the constructor declarator @p D with type @p
7523/// R. If there are any errors in the declarator, this routine will
7524/// emit diagnostics and set the invalid bit to true. In any case, the type
7525/// will be updated to reflect a well-formed type for the constructor and
7526/// returned.
7527QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R,
7528 StorageClass &SC) {
7529 bool isVirtual = D.getDeclSpec().isVirtualSpecified();
7530
7531 // C++ [class.ctor]p3:
7532 // A constructor shall not be virtual (10.3) or static (9.4). A
7533 // constructor can be invoked for a const, volatile or const
7534 // volatile object. A constructor shall not be declared const,
7535 // volatile, or const volatile (9.3.2).
7536 if (isVirtual) {
7537 if (!D.isInvalidType())
7538 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
7539 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc())
7540 << SourceRange(D.getIdentifierLoc());
7541 D.setInvalidType();
7542 }
7543 if (SC == SC_Static) {
7544 if (!D.isInvalidType())
7545 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
7546 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
7547 << SourceRange(D.getIdentifierLoc());
7548 D.setInvalidType();
7549 SC = SC_None;
7550 }
7551
7552 if (unsigned TypeQuals = D.getDeclSpec().getTypeQualifiers()) {
7553 diagnoseIgnoredQualifiers(
7554 diag::err_constructor_return_type, TypeQuals, SourceLocation(),
7555 D.getDeclSpec().getConstSpecLoc(), D.getDeclSpec().getVolatileSpecLoc(),
7556 D.getDeclSpec().getRestrictSpecLoc(),
7557 D.getDeclSpec().getAtomicSpecLoc());
7558 D.setInvalidType();
7559 }
7560
7561 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
7562 if (FTI.TypeQuals != 0) {
7563 if (FTI.TypeQuals & Qualifiers::Const)
7564 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
7565 << "const" << SourceRange(D.getIdentifierLoc());
7566 if (FTI.TypeQuals & Qualifiers::Volatile)
7567 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
7568 << "volatile" << SourceRange(D.getIdentifierLoc());
7569 if (FTI.TypeQuals & Qualifiers::Restrict)
7570 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
7571 << "restrict" << SourceRange(D.getIdentifierLoc());
7572 D.setInvalidType();
7573 }
7574
7575 // C++0x [class.ctor]p4:
7576 // A constructor shall not be declared with a ref-qualifier.
7577 if (FTI.hasRefQualifier()) {
7578 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor)
7579 << FTI.RefQualifierIsLValueRef
7580 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc());
7581 D.setInvalidType();
7582 }
7583
7584 // Rebuild the function type "R" without any type qualifiers (in
7585 // case any of the errors above fired) and with "void" as the
7586 // return type, since constructors don't have return types.
7587 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();
7588 if (Proto->getReturnType() == Context.VoidTy && !D.isInvalidType())
7589 return R;
7590
7591 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo();
7592 EPI.TypeQuals = 0;
7593 EPI.RefQualifier = RQ_None;
7594
7595 return Context.getFunctionType(Context.VoidTy, Proto->getParamTypes(), EPI);
7596}
7597
7598/// CheckConstructor - Checks a fully-formed constructor for
7599/// well-formedness, issuing any diagnostics required. Returns true if
7600/// the constructor declarator is invalid.
7601void Sema::CheckConstructor(CXXConstructorDecl *Constructor) {
7602 CXXRecordDecl *ClassDecl
7603 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext());
7604 if (!ClassDecl)
7605 return Constructor->setInvalidDecl();
7606
7607 // C++ [class.copy]p3:
7608 // A declaration of a constructor for a class X is ill-formed if
7609 // its first parameter is of type (optionally cv-qualified) X and
7610 // either there are no other parameters or else all other
7611 // parameters have default arguments.
7612 if (!Constructor->isInvalidDecl() &&
7613 ((Constructor->getNumParams() == 1) ||
7614 (Constructor->getNumParams() > 1 &&
7615 Constructor->getParamDecl(1)->hasDefaultArg())) &&
7616 Constructor->getTemplateSpecializationKind()
7617 != TSK_ImplicitInstantiation) {
7618 QualType ParamType = Constructor->getParamDecl(0)->getType();
7619 QualType ClassTy = Context.getTagDeclType(ClassDecl);
7620 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) {
7621 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation();
7622 const char *ConstRef
7623 = Constructor->getParamDecl(0)->getIdentifier() ? "const &"
7624 : " const &";
7625 Diag(ParamLoc, diag::err_constructor_byvalue_arg)
7626 << FixItHint::CreateInsertion(ParamLoc, ConstRef);
7627
7628 // FIXME: Rather that making the constructor invalid, we should endeavor
7629 // to fix the type.
7630 Constructor->setInvalidDecl();
7631 }
7632 }
7633}
7634
7635/// CheckDestructor - Checks a fully-formed destructor definition for
7636/// well-formedness, issuing any diagnostics required. Returns true
7637/// on error.
7638bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) {
7639 CXXRecordDecl *RD = Destructor->getParent();
7640
7641 if (!Destructor->getOperatorDelete() && Destructor->isVirtual()) {
7642 SourceLocation Loc;
7643
7644 if (!Destructor->isImplicit())
7645 Loc = Destructor->getLocation();
7646 else
7647 Loc = RD->getLocation();
7648
7649 // If we have a virtual destructor, look up the deallocation function
7650 if (FunctionDecl *OperatorDelete =
7651 FindDeallocationFunctionForDestructor(Loc, RD)) {
7652 MarkFunctionReferenced(Loc, OperatorDelete);
7653 Destructor->setOperatorDelete(OperatorDelete);
7654 }
7655 }
7656
7657 return false;
7658}
7659
7660/// CheckDestructorDeclarator - Called by ActOnDeclarator to check
7661/// the well-formednes of the destructor declarator @p D with type @p
7662/// R. If there are any errors in the declarator, this routine will
7663/// emit diagnostics and set the declarator to invalid. Even if this happens,
7664/// will be updated to reflect a well-formed type for the destructor and
7665/// returned.
7666QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R,
7667 StorageClass& SC) {
7668 // C++ [class.dtor]p1:
7669 // [...] A typedef-name that names a class is a class-name
7670 // (7.1.3); however, a typedef-name that names a class shall not
7671 // be used as the identifier in the declarator for a destructor
7672 // declaration.
7673 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName);
7674 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>())
7675 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name)
7676 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl());
7677 else if (const TemplateSpecializationType *TST =
7678 DeclaratorType->getAs<TemplateSpecializationType>())
7679 if (TST->isTypeAlias())
7680 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name)
7681 << DeclaratorType << 1;
7682
7683 // C++ [class.dtor]p2:
7684 // A destructor is used to destroy objects of its class type. A
7685 // destructor takes no parameters, and no return type can be
7686 // specified for it (not even void). The address of a destructor
7687 // shall not be taken. A destructor shall not be static. A
7688 // destructor can be invoked for a const, volatile or const
7689 // volatile object. A destructor shall not be declared const,
7690 // volatile or const volatile (9.3.2).
7691 if (SC == SC_Static) {
7692 if (!D.isInvalidType())
7693 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be)
7694 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
7695 << SourceRange(D.getIdentifierLoc())
7696 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
7697
7698 SC = SC_None;
7699 }
7700 if (!D.isInvalidType()) {
7701 // Destructors don't have return types, but the parser will
7702 // happily parse something like:
7703 //
7704 // class X {
7705 // float ~X();
7706 // };
7707 //
7708 // The return type will be eliminated later.
7709 if (D.getDeclSpec().hasTypeSpecifier())
7710 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type)
7711 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
7712 << SourceRange(D.getIdentifierLoc());
7713 else if (unsigned TypeQuals = D.getDeclSpec().getTypeQualifiers()) {
7714 diagnoseIgnoredQualifiers(diag::err_destructor_return_type, TypeQuals,
7715 SourceLocation(),
7716 D.getDeclSpec().getConstSpecLoc(),
7717 D.getDeclSpec().getVolatileSpecLoc(),
7718 D.getDeclSpec().getRestrictSpecLoc(),
7719 D.getDeclSpec().getAtomicSpecLoc());
7720 D.setInvalidType();
7721 }
7722 }
7723
7724 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
7725 if (FTI.TypeQuals != 0 && !D.isInvalidType()) {
7726 if (FTI.TypeQuals & Qualifiers::Const)
7727 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
7728 << "const" << SourceRange(D.getIdentifierLoc());
7729 if (FTI.TypeQuals & Qualifiers::Volatile)
7730 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
7731 << "volatile" << SourceRange(D.getIdentifierLoc());
7732 if (FTI.TypeQuals & Qualifiers::Restrict)
7733 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
7734 << "restrict" << SourceRange(D.getIdentifierLoc());
7735 D.setInvalidType();
7736 }
7737
7738 // C++0x [class.dtor]p2:
7739 // A destructor shall not be declared with a ref-qualifier.
7740 if (FTI.hasRefQualifier()) {
7741 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor)
7742 << FTI.RefQualifierIsLValueRef
7743 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc());
7744 D.setInvalidType();
7745 }
7746
7747 // Make sure we don't have any parameters.
7748 if (FTIHasNonVoidParameters(FTI)) {
7749 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params);
7750
7751 // Delete the parameters.
7752 FTI.freeParams();
7753 D.setInvalidType();
7754 }
7755
7756 // Make sure the destructor isn't variadic.
7757 if (FTI.isVariadic) {
7758 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic);
7759 D.setInvalidType();
7760 }
7761
7762 // Rebuild the function type "R" without any type qualifiers or
7763 // parameters (in case any of the errors above fired) and with
7764 // "void" as the return type, since destructors don't have return
7765 // types.
7766 if (!D.isInvalidType())
7767 return R;
7768
7769 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();
7770 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo();
7771 EPI.Variadic = false;
7772 EPI.TypeQuals = 0;
7773 EPI.RefQualifier = RQ_None;
7774 return Context.getFunctionType(Context.VoidTy, None, EPI);
7775}
7776
7777static void extendLeft(SourceRange &R, SourceRange Before) {
7778 if (Before.isInvalid())
7779 return;
7780 R.setBegin(Before.getBegin());
7781 if (R.getEnd().isInvalid())
7782 R.setEnd(Before.getEnd());
7783}
7784
7785static void extendRight(SourceRange &R, SourceRange After) {
7786 if (After.isInvalid())
7787 return;
7788 if (R.getBegin().isInvalid())
7789 R.setBegin(After.getBegin());
7790 R.setEnd(After.getEnd());
7791}
7792
7793/// CheckConversionDeclarator - Called by ActOnDeclarator to check the
7794/// well-formednes of the conversion function declarator @p D with
7795/// type @p R. If there are any errors in the declarator, this routine
7796/// will emit diagnostics and return true. Otherwise, it will return
7797/// false. Either way, the type @p R will be updated to reflect a
7798/// well-formed type for the conversion operator.
7799void Sema::CheckConversionDeclarator(Declarator &D, QualType &R,
7800 StorageClass& SC) {
7801 // C++ [class.conv.fct]p1:
7802 // Neither parameter types nor return type can be specified. The
7803 // type of a conversion function (8.3.5) is "function taking no
7804 // parameter returning conversion-type-id."
7805 if (SC == SC_Static) {
7806 if (!D.isInvalidType())
7807 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member)
7808 << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
7809 << D.getName().getSourceRange();
7810 D.setInvalidType();
7811 SC = SC_None;
7812 }
7813
7814 TypeSourceInfo *ConvTSI = nullptr;
7815 QualType ConvType =
7816 GetTypeFromParser(D.getName().ConversionFunctionId, &ConvTSI);
7817
7818 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) {
7819 // Conversion functions don't have return types, but the parser will
7820 // happily parse something like:
7821 //
7822 // class X {
7823 // float operator bool();
7824 // };
7825 //
7826 // The return type will be changed later anyway.
7827 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type)
7828 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
7829 << SourceRange(D.getIdentifierLoc());
7830 D.setInvalidType();
7831 }
7832
7833 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();
7834
7835 // Make sure we don't have any parameters.
7836 if (Proto->getNumParams() > 0) {
7837 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params);
7838
7839 // Delete the parameters.
7840 D.getFunctionTypeInfo().freeParams();
7841 D.setInvalidType();
7842 } else if (Proto->isVariadic()) {
7843 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic);
7844 D.setInvalidType();
7845 }
7846
7847 // Diagnose "&operator bool()" and other such nonsense. This
7848 // is actually a gcc extension which we don't support.
7849 if (Proto->getReturnType() != ConvType) {
7850 bool NeedsTypedef = false;
7851 SourceRange Before, After;
7852
7853 // Walk the chunks and extract information on them for our diagnostic.
7854 bool PastFunctionChunk = false;
7855 for (auto &Chunk : D.type_objects()) {
7856 switch (Chunk.Kind) {
7857 case DeclaratorChunk::Function:
7858 if (!PastFunctionChunk) {
7859 if (Chunk.Fun.HasTrailingReturnType) {
7860 TypeSourceInfo *TRT = nullptr;
7861 GetTypeFromParser(Chunk.Fun.getTrailingReturnType(), &TRT);
7862 if (TRT) extendRight(After, TRT->getTypeLoc().getSourceRange());
7863 }
7864 PastFunctionChunk = true;
7865 break;
7866 }
7867 // Fall through.
7868 case DeclaratorChunk::Array:
7869 NeedsTypedef = true;
7870 extendRight(After, Chunk.getSourceRange());
7871 break;
7872
7873 case DeclaratorChunk::Pointer:
7874 case DeclaratorChunk::BlockPointer:
7875 case DeclaratorChunk::Reference:
7876 case DeclaratorChunk::MemberPointer:
7877 case DeclaratorChunk::Pipe:
7878 extendLeft(Before, Chunk.getSourceRange());
7879 break;
7880
7881 case DeclaratorChunk::Paren:
7882 extendLeft(Before, Chunk.Loc);
7883 extendRight(After, Chunk.EndLoc);
7884 break;
7885 }
7886 }
7887
7888 SourceLocation Loc = Before.isValid() ? Before.getBegin() :
7889 After.isValid() ? After.getBegin() :
7890 D.getIdentifierLoc();
7891 auto &&DB = Diag(Loc, diag::err_conv_function_with_complex_decl);
7892 DB << Before << After;
7893
7894 if (!NeedsTypedef) {
7895 DB << /*don't need a typedef*/0;
7896
7897 // If we can provide a correct fix-it hint, do so.
7898 if (After.isInvalid() && ConvTSI) {
7899 SourceLocation InsertLoc =
7900 getLocForEndOfToken(ConvTSI->getTypeLoc().getLocEnd());
7901 DB << FixItHint::CreateInsertion(InsertLoc, " ")
7902 << FixItHint::CreateInsertionFromRange(
7903 InsertLoc, CharSourceRange::getTokenRange(Before))
7904 << FixItHint::CreateRemoval(Before);
7905 }
7906 } else if (!Proto->getReturnType()->isDependentType()) {
7907 DB << /*typedef*/1 << Proto->getReturnType();
7908 } else if (getLangOpts().CPlusPlus11) {
7909 DB << /*alias template*/2 << Proto->getReturnType();
7910 } else {
7911 DB << /*might not be fixable*/3;
7912 }
7913
7914 // Recover by incorporating the other type chunks into the result type.
7915 // Note, this does *not* change the name of the function. This is compatible
7916 // with the GCC extension:
7917 // struct S { &operator int(); } s;
7918 // int &r = s.operator int(); // ok in GCC
7919 // S::operator int&() {} // error in GCC, function name is 'operator int'.
7920 ConvType = Proto->getReturnType();
7921 }
7922
7923 // C++ [class.conv.fct]p4:
7924 // The conversion-type-id shall not represent a function type nor
7925 // an array type.
7926 if (ConvType->isArrayType()) {
7927 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array);
7928 ConvType = Context.getPointerType(ConvType);
7929 D.setInvalidType();
7930 } else if (ConvType->isFunctionType()) {
7931 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function);
7932 ConvType = Context.getPointerType(ConvType);
7933 D.setInvalidType();
7934 }
7935
7936 // Rebuild the function type "R" without any parameters (in case any
7937 // of the errors above fired) and with the conversion type as the
7938 // return type.
7939 if (D.isInvalidType())
7940 R = Context.getFunctionType(ConvType, None, Proto->getExtProtoInfo());
7941
7942 // C++0x explicit conversion operators.
7943 if (D.getDeclSpec().isExplicitSpecified())
7944 Diag(D.getDeclSpec().getExplicitSpecLoc(),
7945 getLangOpts().CPlusPlus11 ?
7946 diag::warn_cxx98_compat_explicit_conversion_functions :
7947 diag::ext_explicit_conversion_functions)
7948 << SourceRange(D.getDeclSpec().getExplicitSpecLoc());
7949}
7950
7951/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete
7952/// the declaration of the given C++ conversion function. This routine
7953/// is responsible for recording the conversion function in the C++
7954/// class, if possible.
7955Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) {
7956 assert(Conversion && "Expected to receive a conversion function declaration")((Conversion && "Expected to receive a conversion function declaration"
) ? static_cast<void> (0) : __assert_fail ("Conversion && \"Expected to receive a conversion function declaration\""
, "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 7956, __PRETTY_FUNCTION__))
;
7957
7958 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext());
7959
7960 // Make sure we aren't redeclaring the conversion function.
7961 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType());
7962
7963 // C++ [class.conv.fct]p1:
7964 // [...] A conversion function is never used to convert a
7965 // (possibly cv-qualified) object to the (possibly cv-qualified)
7966 // same object type (or a reference to it), to a (possibly
7967 // cv-qualified) base class of that type (or a reference to it),
7968 // or to (possibly cv-qualified) void.
7969 // FIXME: Suppress this warning if the conversion function ends up being a
7970 // virtual function that overrides a virtual function in a base class.
7971 QualType ClassType
7972 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
7973 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>())
7974 ConvType = ConvTypeRef->getPointeeType();
7975 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared &&
7976 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization)
7977 /* Suppress diagnostics for instantiations. */;
7978 else if (ConvType->isRecordType()) {
7979 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType();
7980 if (ConvType == ClassType)
7981 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used)
7982 << ClassType;
7983 else if (IsDerivedFrom(Conversion->getLocation(), ClassType, ConvType))
7984 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used)
7985 << ClassType << ConvType;
7986 } else if (ConvType->isVoidType()) {
7987 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used)
7988 << ClassType << ConvType;
7989 }
7990
7991 if (FunctionTemplateDecl *ConversionTemplate
7992 = Conversion->getDescribedFunctionTemplate())
7993 return ConversionTemplate;
7994
7995 return Conversion;
7996}
7997
7998//===----------------------------------------------------------------------===//
7999// Namespace Handling
8000//===----------------------------------------------------------------------===//
8001
8002/// \brief Diagnose a mismatch in 'inline' qualifiers when a namespace is
8003/// reopened.
8004static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc,
8005 SourceLocation Loc,
8006 IdentifierInfo *II, bool *IsInline,
8007 NamespaceDecl *PrevNS) {
8008 assert(*IsInline != PrevNS->isInline())((*IsInline != PrevNS->isInline()) ? static_cast<void>
(0) : __assert_fail ("*IsInline != PrevNS->isInline()", "/tmp/buildd/llvm-toolchain-snapshot-4.0~svn290870/tools/clang/lib/Sema/SemaDeclCXX.cpp"
, 8008, __PRETTY_FUNCTION__))
;
8009
8010 // HACK: Work around a bug in libstdc++4.6's <atomic>, where
8011 // std::__atomic[0,1,2] are defined as non-inline namespaces, then reopened as
8012 // inline namespaces, with the intention of bringing names into namespace std.
8013 //
8014 // We support this just well enough to get that case working; this is not
8015 // sufficient to support reopening namespaces as inline in general.
8016 if (*IsInline && II && II->getName().startswith("__atomic") &&
8017 S.getSourceManager().isInSystemHeader(Loc)) {
8018 // Mark all prior declarations of the namespace as inline.
8019 for (NamespaceDecl *NS = PrevNS->getMostRecentDecl(); NS;
8020 NS = NS->getPreviousDecl())
8021 NS->setInline(*IsInline);
8022 // Patch up the lookup table for the containing namespace. This isn't really
8023 // correct, but it's good enough for this particular case.
8024 for (auto *I : PrevNS->decls())
8025 if (auto *ND = dyn_cast<NamedDecl>(I))
8026 PrevNS->getParent()->makeDeclVisibleInContext(ND);
8027 return;
8028 }
8029
8030 if (PrevNS->isInline())
8031 // The user probably just forgot the 'inline', so suggest that it
8032 // be added back.
8033 S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline)
8034 << FixItHint::CreateInsertion(KeywordLoc, "inline ");
8035 else
8036 S.Diag(Loc, diag::err_inline_namespace_mismatch);
8037
8038 S.Diag(PrevNS->getLocation(), diag::note_previous_definition);
8039 *IsInline = PrevNS->isInline();
8040}
8041
8042/// ActOnStartNamespaceDef - This is called at the start of a namespace
8043/// definition.
8044Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope,
8045 SourceLocation InlineLoc,
8046 SourceLocation NamespaceLoc,
8047 SourceLocation IdentLoc,
8048 IdentifierInfo *II,
8049 SourceLocation LBrace,
8050 AttributeList *AttrList,
8051 UsingDirectiveDecl *&UD) {
8052 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc;
8053 // For anonymous namespace,