Bug Summary

File:clang/lib/Sema/SemaDeclCXX.cpp
Warning:line 1507, column 15
Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name SemaDeclCXX.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mthread-model posix -mframe-pointer=none -relaxed-aliasing -fmath-errno -fno-rounding-math -masm-verbose -mconstructor-aliases -munwind-tables -target-cpu x86-64 -dwarf-column-info -fno-split-dwarf-inlining -debugger-tuning=gdb -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-10/lib/clang/10.0.0 -D CLANG_VENDOR="Debian " -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/build-llvm/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/build-llvm/include -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-10/lib/clang/10.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/build-llvm/tools/clang/lib/Sema -fdebug-prefix-map=/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd=. -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -fobjc-runtime=gcc -fno-common -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -o /tmp/scan-build-2020-01-13-084841-49055-1 -x c++ /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file implements semantic analysis for C++ declarations.
10//
11//===----------------------------------------------------------------------===//
12
13#include "clang/AST/ASTConsumer.h"
14#include "clang/AST/ASTContext.h"
15#include "clang/AST/ASTLambda.h"
16#include "clang/AST/ASTMutationListener.h"
17#include "clang/AST/CXXInheritance.h"
18#include "clang/AST/CharUnits.h"
19#include "clang/AST/ComparisonCategories.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/AttributeCommonInfo.h"
28#include "clang/Basic/PartialDiagnostic.h"
29#include "clang/Basic/TargetInfo.h"
30#include "clang/Lex/LiteralSupport.h"
31#include "clang/Lex/Preprocessor.h"
32#include "clang/Sema/CXXFieldCollector.h"
33#include "clang/Sema/DeclSpec.h"
34#include "clang/Sema/Initialization.h"
35#include "clang/Sema/Lookup.h"
36#include "clang/Sema/ParsedTemplate.h"
37#include "clang/Sema/Scope.h"
38#include "clang/Sema/ScopeInfo.h"
39#include "clang/Sema/SemaInternal.h"
40#include "clang/Sema/Template.h"
41#include "llvm/ADT/STLExtras.h"
42#include "llvm/ADT/SmallString.h"
43#include "llvm/ADT/StringExtras.h"
44#include <map>
45#include <set>
46
47using namespace clang;
48
49//===----------------------------------------------------------------------===//
50// CheckDefaultArgumentVisitor
51//===----------------------------------------------------------------------===//
52
53namespace {
54 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses
55 /// the default argument of a parameter to determine whether it
56 /// contains any ill-formed subexpressions. For example, this will
57 /// diagnose the use of local variables or parameters within the
58 /// default argument expression.
59 class CheckDefaultArgumentVisitor
60 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> {
61 Expr *DefaultArg;
62 Sema *S;
63
64 public:
65 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s)
66 : DefaultArg(defarg), S(s) {}
67
68 bool VisitExpr(Expr *Node);
69 bool VisitDeclRefExpr(DeclRefExpr *DRE);
70 bool VisitCXXThisExpr(CXXThisExpr *ThisE);
71 bool VisitLambdaExpr(LambdaExpr *Lambda);
72 bool VisitPseudoObjectExpr(PseudoObjectExpr *POE);
73 };
74
75 /// VisitExpr - Visit all of the children of this expression.
76 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) {
77 bool IsInvalid = false;
78 for (Stmt *SubStmt : Node->children())
79 IsInvalid |= Visit(SubStmt);
80 return IsInvalid;
81 }
82
83 /// VisitDeclRefExpr - Visit a reference to a declaration, to
84 /// determine whether this declaration can be used in the default
85 /// argument expression.
86 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) {
87 NamedDecl *Decl = DRE->getDecl();
88 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) {
89 // C++ [dcl.fct.default]p9
90 // Default arguments are evaluated each time the function is
91 // called. The order of evaluation of function arguments is
92 // unspecified. Consequently, parameters of a function shall not
93 // be used in default argument expressions, even if they are not
94 // evaluated. Parameters of a function declared before a default
95 // argument expression are in scope and can hide namespace and
96 // class member names.
97 return S->Diag(DRE->getBeginLoc(),
98 diag::err_param_default_argument_references_param)
99 << Param->getDeclName() << DefaultArg->getSourceRange();
100 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) {
101 // C++ [dcl.fct.default]p7
102 // Local variables shall not be used in default argument
103 // expressions.
104 if (VDecl->isLocalVarDecl())
105 return S->Diag(DRE->getBeginLoc(),
106 diag::err_param_default_argument_references_local)
107 << VDecl->getDeclName() << DefaultArg->getSourceRange();
108 }
109
110 return false;
111 }
112
113 /// VisitCXXThisExpr - Visit a C++ "this" expression.
114 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) {
115 // C++ [dcl.fct.default]p8:
116 // The keyword this shall not be used in a default argument of a
117 // member function.
118 return S->Diag(ThisE->getBeginLoc(),
119 diag::err_param_default_argument_references_this)
120 << ThisE->getSourceRange();
121 }
122
123 bool CheckDefaultArgumentVisitor::VisitPseudoObjectExpr(PseudoObjectExpr *POE) {
124 bool Invalid = false;
125 for (PseudoObjectExpr::semantics_iterator
126 i = POE->semantics_begin(), e = POE->semantics_end(); i != e; ++i) {
127 Expr *E = *i;
128
129 // Look through bindings.
130 if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(E)) {
131 E = OVE->getSourceExpr();
132 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?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 132, __PRETTY_FUNCTION__))
;
133 }
134
135 Invalid |= Visit(E);
136 }
137 return Invalid;
138 }
139
140 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) {
141 // C++11 [expr.lambda.prim]p13:
142 // A lambda-expression appearing in a default argument shall not
143 // implicitly or explicitly capture any entity.
144 if (Lambda->capture_begin() == Lambda->capture_end())
145 return false;
146
147 return S->Diag(Lambda->getBeginLoc(), 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 if (EST == EST_None && Method->hasAttr<NoThrowAttr>())
171 EST = EST_BasicNoexcept;
172
173 switch (EST) {
174 case EST_Unparsed:
175 case EST_Uninstantiated:
176 case EST_Unevaluated:
177 llvm_unreachable("should not see unresolved exception specs here")::llvm::llvm_unreachable_internal("should not see unresolved exception specs here"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 177)
;
178
179 // If this function can throw any exceptions, make a note of that.
180 case EST_MSAny:
181 case EST_None:
182 // FIXME: Whichever we see last of MSAny and None determines our result.
183 // We should make a consistent, order-independent choice here.
184 ClearExceptions();
185 ComputedEST = EST;
186 return;
187 case EST_NoexceptFalse:
188 ClearExceptions();
189 ComputedEST = EST_None;
190 return;
191 // FIXME: If the call to this decl is using any of its default arguments, we
192 // need to search them for potentially-throwing calls.
193 // If this function has a basic noexcept, it doesn't affect the outcome.
194 case EST_BasicNoexcept:
195 case EST_NoexceptTrue:
196 case EST_NoThrow:
197 return;
198 // If we're still at noexcept(true) and there's a throw() callee,
199 // change to that specification.
200 case EST_DynamicNone:
201 if (ComputedEST == EST_BasicNoexcept)
202 ComputedEST = EST_DynamicNone;
203 return;
204 case EST_DependentNoexcept:
205 llvm_unreachable(::llvm::llvm_unreachable_internal("should not generate implicit declarations for dependent cases"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 206)
206 "should not generate implicit declarations for dependent cases")::llvm::llvm_unreachable_internal("should not generate implicit declarations for dependent cases"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 206)
;
207 case EST_Dynamic:
208 break;
209 }
210 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.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 210, __PRETTY_FUNCTION__))
;
211 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.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 212, __PRETTY_FUNCTION__))
212 "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.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 212, __PRETTY_FUNCTION__))
;
213 ComputedEST = EST_Dynamic;
214 // Record the exceptions in this function's exception specification.
215 for (const auto &E : Proto->exceptions())
216 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(E)).second)
217 Exceptions.push_back(E);
218}
219
220void Sema::ImplicitExceptionSpecification::CalledStmt(Stmt *S) {
221 if (!S || ComputedEST == EST_MSAny)
222 return;
223
224 // FIXME:
225 //
226 // C++0x [except.spec]p14:
227 // [An] implicit exception-specification specifies the type-id T if and
228 // only if T is allowed by the exception-specification of a function directly
229 // invoked by f's implicit definition; f shall allow all exceptions if any
230 // function it directly invokes allows all exceptions, and f shall allow no
231 // exceptions if every function it directly invokes allows no exceptions.
232 //
233 // Note in particular that if an implicit exception-specification is generated
234 // for a function containing a throw-expression, that specification can still
235 // be noexcept(true).
236 //
237 // Note also that 'directly invoked' is not defined in the standard, and there
238 // is no indication that we should only consider potentially-evaluated calls.
239 //
240 // Ultimately we should implement the intent of the standard: the exception
241 // specification should be the set of exceptions which can be thrown by the
242 // implicit definition. For now, we assume that any non-nothrow expression can
243 // throw any exception.
244
245 if (Self->canThrow(S))
246 ComputedEST = EST_None;
247}
248
249bool
250Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg,
251 SourceLocation EqualLoc) {
252 if (RequireCompleteType(Param->getLocation(), Param->getType(),
253 diag::err_typecheck_decl_incomplete_type)) {
254 Param->setInvalidDecl();
255 return true;
256 }
257
258 // C++ [dcl.fct.default]p5
259 // A default argument expression is implicitly converted (clause
260 // 4) to the parameter type. The default argument expression has
261 // the same semantic constraints as the initializer expression in
262 // a declaration of a variable of the parameter type, using the
263 // copy-initialization semantics (8.5).
264 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
265 Param);
266 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(),
267 EqualLoc);
268 InitializationSequence InitSeq(*this, Entity, Kind, Arg);
269 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Arg);
270 if (Result.isInvalid())
271 return true;
272 Arg = Result.getAs<Expr>();
273
274 CheckCompletedExpr(Arg, EqualLoc);
275 Arg = MaybeCreateExprWithCleanups(Arg);
276
277 // Okay: add the default argument to the parameter
278 Param->setDefaultArg(Arg);
279
280 // We have already instantiated this parameter; provide each of the
281 // instantiations with the uninstantiated default argument.
282 UnparsedDefaultArgInstantiationsMap::iterator InstPos
283 = UnparsedDefaultArgInstantiations.find(Param);
284 if (InstPos != UnparsedDefaultArgInstantiations.end()) {
285 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I)
286 InstPos->second[I]->setUninstantiatedDefaultArg(Arg);
287
288 // We're done tracking this parameter's instantiations.
289 UnparsedDefaultArgInstantiations.erase(InstPos);
290 }
291
292 return false;
293}
294
295/// ActOnParamDefaultArgument - Check whether the default argument
296/// provided for a function parameter is well-formed. If so, attach it
297/// to the parameter declaration.
298void
299Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc,
300 Expr *DefaultArg) {
301 if (!param || !DefaultArg)
302 return;
303
304 ParmVarDecl *Param = cast<ParmVarDecl>(param);
305 UnparsedDefaultArgLocs.erase(Param);
306
307 // Default arguments are only permitted in C++
308 if (!getLangOpts().CPlusPlus) {
309 Diag(EqualLoc, diag::err_param_default_argument)
310 << DefaultArg->getSourceRange();
311 Param->setInvalidDecl();
312 return;
313 }
314
315 // Check for unexpanded parameter packs.
316 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) {
317 Param->setInvalidDecl();
318 return;
319 }
320
321 // C++11 [dcl.fct.default]p3
322 // A default argument expression [...] shall not be specified for a
323 // parameter pack.
324 if (Param->isParameterPack()) {
325 Diag(EqualLoc, diag::err_param_default_argument_on_parameter_pack)
326 << DefaultArg->getSourceRange();
327 return;
328 }
329
330 // Check that the default argument is well-formed
331 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this);
332 if (DefaultArgChecker.Visit(DefaultArg)) {
333 Param->setInvalidDecl();
334 return;
335 }
336
337 SetParamDefaultArgument(Param, DefaultArg, EqualLoc);
338}
339
340/// ActOnParamUnparsedDefaultArgument - We've seen a default
341/// argument for a function parameter, but we can't parse it yet
342/// because we're inside a class definition. Note that this default
343/// argument will be parsed later.
344void Sema::ActOnParamUnparsedDefaultArgument(Decl *param,
345 SourceLocation EqualLoc,
346 SourceLocation ArgLoc) {
347 if (!param)
348 return;
349
350 ParmVarDecl *Param = cast<ParmVarDecl>(param);
351 Param->setUnparsedDefaultArg();
352 UnparsedDefaultArgLocs[Param] = ArgLoc;
353}
354
355/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of
356/// the default argument for the parameter param failed.
357void Sema::ActOnParamDefaultArgumentError(Decl *param,
358 SourceLocation EqualLoc) {
359 if (!param)
360 return;
361
362 ParmVarDecl *Param = cast<ParmVarDecl>(param);
363 Param->setInvalidDecl();
364 UnparsedDefaultArgLocs.erase(Param);
365 Param->setDefaultArg(new(Context)
366 OpaqueValueExpr(EqualLoc,
367 Param->getType().getNonReferenceType(),
368 VK_RValue));
369}
370
371/// CheckExtraCXXDefaultArguments - Check for any extra default
372/// arguments in the declarator, which is not a function declaration
373/// or definition and therefore is not permitted to have default
374/// arguments. This routine should be invoked for every declarator
375/// that is not a function declaration or definition.
376void Sema::CheckExtraCXXDefaultArguments(Declarator &D) {
377 // C++ [dcl.fct.default]p3
378 // A default argument expression shall be specified only in the
379 // parameter-declaration-clause of a function declaration or in a
380 // template-parameter (14.1). It shall not be specified for a
381 // parameter pack. If it is specified in a
382 // parameter-declaration-clause, it shall not occur within a
383 // declarator or abstract-declarator of a parameter-declaration.
384 bool MightBeFunction = D.isFunctionDeclarationContext();
385 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
386 DeclaratorChunk &chunk = D.getTypeObject(i);
387 if (chunk.Kind == DeclaratorChunk::Function) {
388 if (MightBeFunction) {
389 // This is a function declaration. It can have default arguments, but
390 // keep looking in case its return type is a function type with default
391 // arguments.
392 MightBeFunction = false;
393 continue;
394 }
395 for (unsigned argIdx = 0, e = chunk.Fun.NumParams; argIdx != e;
396 ++argIdx) {
397 ParmVarDecl *Param = cast<ParmVarDecl>(chunk.Fun.Params[argIdx].Param);
398 if (Param->hasUnparsedDefaultArg()) {
399 std::unique_ptr<CachedTokens> Toks =
400 std::move(chunk.Fun.Params[argIdx].DefaultArgTokens);
401 SourceRange SR;
402 if (Toks->size() > 1)
403 SR = SourceRange((*Toks)[1].getLocation(),
404 Toks->back().getLocation());
405 else
406 SR = UnparsedDefaultArgLocs[Param];
407 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc)
408 << SR;
409 } else if (Param->getDefaultArg()) {
410 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc)
411 << Param->getDefaultArg()->getSourceRange();
412 Param->setDefaultArg(nullptr);
413 }
414 }
415 } else if (chunk.Kind != DeclaratorChunk::Paren) {
416 MightBeFunction = false;
417 }
418 }
419}
420
421static bool functionDeclHasDefaultArgument(const FunctionDecl *FD) {
422 for (unsigned NumParams = FD->getNumParams(); NumParams > 0; --NumParams) {
423 const ParmVarDecl *PVD = FD->getParamDecl(NumParams-1);
424 if (!PVD->hasDefaultArg())
425 return false;
426 if (!PVD->hasInheritedDefaultArg())
427 return true;
428 }
429 return false;
430}
431
432/// MergeCXXFunctionDecl - Merge two declarations of the same C++
433/// function, once we already know that they have the same
434/// type. Subroutine of MergeFunctionDecl. Returns true if there was an
435/// error, false otherwise.
436bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old,
437 Scope *S) {
438 bool Invalid = false;
439
440 // The declaration context corresponding to the scope is the semantic
441 // parent, unless this is a local function declaration, in which case
442 // it is that surrounding function.
443 DeclContext *ScopeDC = New->isLocalExternDecl()
444 ? New->getLexicalDeclContext()
445 : New->getDeclContext();
446
447 // Find the previous declaration for the purpose of default arguments.
448 FunctionDecl *PrevForDefaultArgs = Old;
449 for (/**/; PrevForDefaultArgs;
450 // Don't bother looking back past the latest decl if this is a local
451 // extern declaration; nothing else could work.
452 PrevForDefaultArgs = New->isLocalExternDecl()
453 ? nullptr
454 : PrevForDefaultArgs->getPreviousDecl()) {
455 // Ignore hidden declarations.
456 if (!LookupResult::isVisible(*this, PrevForDefaultArgs))
457 continue;
458
459 if (S && !isDeclInScope(PrevForDefaultArgs, ScopeDC, S) &&
460 !New->isCXXClassMember()) {
461 // Ignore default arguments of old decl if they are not in
462 // the same scope and this is not an out-of-line definition of
463 // a member function.
464 continue;
465 }
466
467 if (PrevForDefaultArgs->isLocalExternDecl() != New->isLocalExternDecl()) {
468 // If only one of these is a local function declaration, then they are
469 // declared in different scopes, even though isDeclInScope may think
470 // they're in the same scope. (If both are local, the scope check is
471 // sufficient, and if neither is local, then they are in the same scope.)
472 continue;
473 }
474
475 // We found the right previous declaration.
476 break;
477 }
478
479 // C++ [dcl.fct.default]p4:
480 // For non-template functions, default arguments can be added in
481 // later declarations of a function in the same
482 // scope. Declarations in different scopes have completely
483 // distinct sets of default arguments. That is, declarations in
484 // inner scopes do not acquire default arguments from
485 // declarations in outer scopes, and vice versa. In a given
486 // function declaration, all parameters subsequent to a
487 // parameter with a default argument shall have default
488 // arguments supplied in this or previous declarations. A
489 // default argument shall not be redefined by a later
490 // declaration (not even to the same value).
491 //
492 // C++ [dcl.fct.default]p6:
493 // Except for member functions of class templates, the default arguments
494 // in a member function definition that appears outside of the class
495 // definition are added to the set of default arguments provided by the
496 // member function declaration in the class definition.
497 for (unsigned p = 0, NumParams = PrevForDefaultArgs
498 ? PrevForDefaultArgs->getNumParams()
499 : 0;
500 p < NumParams; ++p) {
501 ParmVarDecl *OldParam = PrevForDefaultArgs->getParamDecl(p);
502 ParmVarDecl *NewParam = New->getParamDecl(p);
503
504 bool OldParamHasDfl = OldParam ? OldParam->hasDefaultArg() : false;
505 bool NewParamHasDfl = NewParam->hasDefaultArg();
506
507 if (OldParamHasDfl && NewParamHasDfl) {
508 unsigned DiagDefaultParamID =
509 diag::err_param_default_argument_redefinition;
510
511 // MSVC accepts that default parameters be redefined for member functions
512 // of template class. The new default parameter's value is ignored.
513 Invalid = true;
514 if (getLangOpts().MicrosoftExt) {
515 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(New);
516 if (MD && MD->getParent()->getDescribedClassTemplate()) {
517 // Merge the old default argument into the new parameter.
518 NewParam->setHasInheritedDefaultArg();
519 if (OldParam->hasUninstantiatedDefaultArg())
520 NewParam->setUninstantiatedDefaultArg(
521 OldParam->getUninstantiatedDefaultArg());
522 else
523 NewParam->setDefaultArg(OldParam->getInit());
524 DiagDefaultParamID = diag::ext_param_default_argument_redefinition;
525 Invalid = false;
526 }
527 }
528
529 // FIXME: If we knew where the '=' was, we could easily provide a fix-it
530 // hint here. Alternatively, we could walk the type-source information
531 // for NewParam to find the last source location in the type... but it
532 // isn't worth the effort right now. This is the kind of test case that
533 // is hard to get right:
534 // int f(int);
535 // void g(int (*fp)(int) = f);
536 // void g(int (*fp)(int) = &f);
537 Diag(NewParam->getLocation(), DiagDefaultParamID)
538 << NewParam->getDefaultArgRange();
539
540 // Look for the function declaration where the default argument was
541 // actually written, which may be a declaration prior to Old.
542 for (auto Older = PrevForDefaultArgs;
543 OldParam->hasInheritedDefaultArg(); /**/) {
544 Older = Older->getPreviousDecl();
545 OldParam = Older->getParamDecl(p);
546 }
547
548 Diag(OldParam->getLocation(), diag::note_previous_definition)
549 << OldParam->getDefaultArgRange();
550 } else if (OldParamHasDfl) {
551 // Merge the old default argument into the new parameter unless the new
552 // function is a friend declaration in a template class. In the latter
553 // case the default arguments will be inherited when the friend
554 // declaration will be instantiated.
555 if (New->getFriendObjectKind() == Decl::FOK_None ||
556 !New->getLexicalDeclContext()->isDependentContext()) {
557 // It's important to use getInit() here; getDefaultArg()
558 // strips off any top-level ExprWithCleanups.
559 NewParam->setHasInheritedDefaultArg();
560 if (OldParam->hasUnparsedDefaultArg())
561 NewParam->setUnparsedDefaultArg();
562 else if (OldParam->hasUninstantiatedDefaultArg())
563 NewParam->setUninstantiatedDefaultArg(
564 OldParam->getUninstantiatedDefaultArg());
565 else
566 NewParam->setDefaultArg(OldParam->getInit());
567 }
568 } else if (NewParamHasDfl) {
569 if (New->getDescribedFunctionTemplate()) {
570 // Paragraph 4, quoted above, only applies to non-template functions.
571 Diag(NewParam->getLocation(),
572 diag::err_param_default_argument_template_redecl)
573 << NewParam->getDefaultArgRange();
574 Diag(PrevForDefaultArgs->getLocation(),
575 diag::note_template_prev_declaration)
576 << false;
577 } else if (New->getTemplateSpecializationKind()
578 != TSK_ImplicitInstantiation &&
579 New->getTemplateSpecializationKind() != TSK_Undeclared) {
580 // C++ [temp.expr.spec]p21:
581 // Default function arguments shall not be specified in a declaration
582 // or a definition for one of the following explicit specializations:
583 // - the explicit specialization of a function template;
584 // - the explicit specialization of a member function template;
585 // - the explicit specialization of a member function of a class
586 // template where the class template specialization to which the
587 // member function specialization belongs is implicitly
588 // instantiated.
589 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg)
590 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization)
591 << New->getDeclName()
592 << NewParam->getDefaultArgRange();
593 } else if (New->getDeclContext()->isDependentContext()) {
594 // C++ [dcl.fct.default]p6 (DR217):
595 // Default arguments for a member function of a class template shall
596 // be specified on the initial declaration of the member function
597 // within the class template.
598 //
599 // Reading the tea leaves a bit in DR217 and its reference to DR205
600 // leads me to the conclusion that one cannot add default function
601 // arguments for an out-of-line definition of a member function of a
602 // dependent type.
603 int WhichKind = 2;
604 if (CXXRecordDecl *Record
605 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) {
606 if (Record->getDescribedClassTemplate())
607 WhichKind = 0;
608 else if (isa<ClassTemplatePartialSpecializationDecl>(Record))
609 WhichKind = 1;
610 else
611 WhichKind = 2;
612 }
613
614 Diag(NewParam->getLocation(),
615 diag::err_param_default_argument_member_template_redecl)
616 << WhichKind
617 << NewParam->getDefaultArgRange();
618 }
619 }
620 }
621
622 // DR1344: If a default argument is added outside a class definition and that
623 // default argument makes the function a special member function, the program
624 // is ill-formed. This can only happen for constructors.
625 if (isa<CXXConstructorDecl>(New) &&
626 New->getMinRequiredArguments() < Old->getMinRequiredArguments()) {
627 CXXSpecialMember NewSM = getSpecialMember(cast<CXXMethodDecl>(New)),
628 OldSM = getSpecialMember(cast<CXXMethodDecl>(Old));
629 if (NewSM != OldSM) {
630 ParmVarDecl *NewParam = New->getParamDecl(New->getMinRequiredArguments());
631 assert(NewParam->hasDefaultArg())((NewParam->hasDefaultArg()) ? static_cast<void> (0)
: __assert_fail ("NewParam->hasDefaultArg()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 631, __PRETTY_FUNCTION__))
;
632 Diag(NewParam->getLocation(), diag::err_default_arg_makes_ctor_special)
633 << NewParam->getDefaultArgRange() << NewSM;
634 Diag(Old->getLocation(), diag::note_previous_declaration);
635 }
636 }
637
638 const FunctionDecl *Def;
639 // C++11 [dcl.constexpr]p1: If any declaration of a function or function
640 // template has a constexpr specifier then all its declarations shall
641 // contain the constexpr specifier.
642 if (New->getConstexprKind() != Old->getConstexprKind()) {
643 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch)
644 << New << New->getConstexprKind() << Old->getConstexprKind();
645 Diag(Old->getLocation(), diag::note_previous_declaration);
646 Invalid = true;
647 } else if (!Old->getMostRecentDecl()->isInlined() && New->isInlined() &&
648 Old->isDefined(Def) &&
649 // If a friend function is inlined but does not have 'inline'
650 // specifier, it is a definition. Do not report attribute conflict
651 // in this case, redefinition will be diagnosed later.
652 (New->isInlineSpecified() ||
653 New->getFriendObjectKind() == Decl::FOK_None)) {
654 // C++11 [dcl.fcn.spec]p4:
655 // If the definition of a function appears in a translation unit before its
656 // first declaration as inline, the program is ill-formed.
657 Diag(New->getLocation(), diag::err_inline_decl_follows_def) << New;
658 Diag(Def->getLocation(), diag::note_previous_definition);
659 Invalid = true;
660 }
661
662 // C++17 [temp.deduct.guide]p3:
663 // Two deduction guide declarations in the same translation unit
664 // for the same class template shall not have equivalent
665 // parameter-declaration-clauses.
666 if (isa<CXXDeductionGuideDecl>(New) &&
667 !New->isFunctionTemplateSpecialization()) {
668 Diag(New->getLocation(), diag::err_deduction_guide_redeclared);
669 Diag(Old->getLocation(), diag::note_previous_declaration);
670 }
671
672 // C++11 [dcl.fct.default]p4: If a friend declaration specifies a default
673 // argument expression, that declaration shall be a definition and shall be
674 // the only declaration of the function or function template in the
675 // translation unit.
676 if (Old->getFriendObjectKind() == Decl::FOK_Undeclared &&
677 functionDeclHasDefaultArgument(Old)) {
678 Diag(New->getLocation(), diag::err_friend_decl_with_def_arg_redeclared);
679 Diag(Old->getLocation(), diag::note_previous_declaration);
680 Invalid = true;
681 }
682
683 return Invalid;
684}
685
686NamedDecl *
687Sema::ActOnDecompositionDeclarator(Scope *S, Declarator &D,
688 MultiTemplateParamsArg TemplateParamLists) {
689 assert(D.isDecompositionDeclarator())((D.isDecompositionDeclarator()) ? static_cast<void> (0
) : __assert_fail ("D.isDecompositionDeclarator()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 689, __PRETTY_FUNCTION__))
;
690 const DecompositionDeclarator &Decomp = D.getDecompositionDeclarator();
691
692 // The syntax only allows a decomposition declarator as a simple-declaration,
693 // a for-range-declaration, or a condition in Clang, but we parse it in more
694 // cases than that.
695 if (!D.mayHaveDecompositionDeclarator()) {
696 Diag(Decomp.getLSquareLoc(), diag::err_decomp_decl_context)
697 << Decomp.getSourceRange();
698 return nullptr;
699 }
700
701 if (!TemplateParamLists.empty()) {
702 // FIXME: There's no rule against this, but there are also no rules that
703 // would actually make it usable, so we reject it for now.
704 Diag(TemplateParamLists.front()->getTemplateLoc(),
705 diag::err_decomp_decl_template);
706 return nullptr;
707 }
708
709 Diag(Decomp.getLSquareLoc(),
710 !getLangOpts().CPlusPlus17
711 ? diag::ext_decomp_decl
712 : D.getContext() == DeclaratorContext::ConditionContext
713 ? diag::ext_decomp_decl_cond
714 : diag::warn_cxx14_compat_decomp_decl)
715 << Decomp.getSourceRange();
716
717 // The semantic context is always just the current context.
718 DeclContext *const DC = CurContext;
719
720 // C++17 [dcl.dcl]/8:
721 // The decl-specifier-seq shall contain only the type-specifier auto
722 // and cv-qualifiers.
723 // C++2a [dcl.dcl]/8:
724 // If decl-specifier-seq contains any decl-specifier other than static,
725 // thread_local, auto, or cv-qualifiers, the program is ill-formed.
726 auto &DS = D.getDeclSpec();
727 {
728 SmallVector<StringRef, 8> BadSpecifiers;
729 SmallVector<SourceLocation, 8> BadSpecifierLocs;
730 SmallVector<StringRef, 8> CPlusPlus20Specifiers;
731 SmallVector<SourceLocation, 8> CPlusPlus20SpecifierLocs;
732 if (auto SCS = DS.getStorageClassSpec()) {
733 if (SCS == DeclSpec::SCS_static) {
734 CPlusPlus20Specifiers.push_back(DeclSpec::getSpecifierName(SCS));
735 CPlusPlus20SpecifierLocs.push_back(DS.getStorageClassSpecLoc());
736 } else {
737 BadSpecifiers.push_back(DeclSpec::getSpecifierName(SCS));
738 BadSpecifierLocs.push_back(DS.getStorageClassSpecLoc());
739 }
740 }
741 if (auto TSCS = DS.getThreadStorageClassSpec()) {
742 CPlusPlus20Specifiers.push_back(DeclSpec::getSpecifierName(TSCS));
743 CPlusPlus20SpecifierLocs.push_back(DS.getThreadStorageClassSpecLoc());
744 }
745 if (DS.hasConstexprSpecifier()) {
746 BadSpecifiers.push_back(
747 DeclSpec::getSpecifierName(DS.getConstexprSpecifier()));
748 BadSpecifierLocs.push_back(DS.getConstexprSpecLoc());
749 }
750 if (DS.isInlineSpecified()) {
751 BadSpecifiers.push_back("inline");
752 BadSpecifierLocs.push_back(DS.getInlineSpecLoc());
753 }
754 if (!BadSpecifiers.empty()) {
755 auto &&Err = Diag(BadSpecifierLocs.front(), diag::err_decomp_decl_spec);
756 Err << (int)BadSpecifiers.size()
757 << llvm::join(BadSpecifiers.begin(), BadSpecifiers.end(), " ");
758 // Don't add FixItHints to remove the specifiers; we do still respect
759 // them when building the underlying variable.
760 for (auto Loc : BadSpecifierLocs)
761 Err << SourceRange(Loc, Loc);
762 } else if (!CPlusPlus20Specifiers.empty()) {
763 auto &&Warn = Diag(CPlusPlus20SpecifierLocs.front(),
764 getLangOpts().CPlusPlus2a
765 ? diag::warn_cxx17_compat_decomp_decl_spec
766 : diag::ext_decomp_decl_spec);
767 Warn << (int)CPlusPlus20Specifiers.size()
768 << llvm::join(CPlusPlus20Specifiers.begin(),
769 CPlusPlus20Specifiers.end(), " ");
770 for (auto Loc : CPlusPlus20SpecifierLocs)
771 Warn << SourceRange(Loc, Loc);
772 }
773 // We can't recover from it being declared as a typedef.
774 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef)
775 return nullptr;
776 }
777
778 // C++2a [dcl.struct.bind]p1:
779 // A cv that includes volatile is deprecated
780 if ((DS.getTypeQualifiers() & DeclSpec::TQ_volatile) &&
781 getLangOpts().CPlusPlus2a)
782 Diag(DS.getVolatileSpecLoc(),
783 diag::warn_deprecated_volatile_structured_binding);
784
785 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
786 QualType R = TInfo->getType();
787
788 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
789 UPPC_DeclarationType))
790 D.setInvalidType();
791
792 // The syntax only allows a single ref-qualifier prior to the decomposition
793 // declarator. No other declarator chunks are permitted. Also check the type
794 // specifier here.
795 if (DS.getTypeSpecType() != DeclSpec::TST_auto ||
796 D.hasGroupingParens() || D.getNumTypeObjects() > 1 ||
797 (D.getNumTypeObjects() == 1 &&
798 D.getTypeObject(0).Kind != DeclaratorChunk::Reference)) {
799 Diag(Decomp.getLSquareLoc(),
800 (D.hasGroupingParens() ||
801 (D.getNumTypeObjects() &&
802 D.getTypeObject(0).Kind == DeclaratorChunk::Paren))
803 ? diag::err_decomp_decl_parens
804 : diag::err_decomp_decl_type)
805 << R;
806
807 // In most cases, there's no actual problem with an explicitly-specified
808 // type, but a function type won't work here, and ActOnVariableDeclarator
809 // shouldn't be called for such a type.
810 if (R->isFunctionType())
811 D.setInvalidType();
812 }
813
814 // Build the BindingDecls.
815 SmallVector<BindingDecl*, 8> Bindings;
816
817 // Build the BindingDecls.
818 for (auto &B : D.getDecompositionDeclarator().bindings()) {
819 // Check for name conflicts.
820 DeclarationNameInfo NameInfo(B.Name, B.NameLoc);
821 LookupResult Previous(*this, NameInfo, LookupOrdinaryName,
822 ForVisibleRedeclaration);
823 LookupName(Previous, S,
824 /*CreateBuiltins*/DC->getRedeclContext()->isTranslationUnit());
825
826 // It's not permitted to shadow a template parameter name.
827 if (Previous.isSingleResult() &&
828 Previous.getFoundDecl()->isTemplateParameter()) {
829 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(),
830 Previous.getFoundDecl());
831 Previous.clear();
832 }
833
834 bool ConsiderLinkage = DC->isFunctionOrMethod() &&
835 DS.getStorageClassSpec() == DeclSpec::SCS_extern;
836 FilterLookupForScope(Previous, DC, S, ConsiderLinkage,
837 /*AllowInlineNamespace*/false);
838 if (!Previous.empty()) {
839 auto *Old = Previous.getRepresentativeDecl();
840 Diag(B.NameLoc, diag::err_redefinition) << B.Name;
841 Diag(Old->getLocation(), diag::note_previous_definition);
842 }
843
844 auto *BD = BindingDecl::Create(Context, DC, B.NameLoc, B.Name);
845 PushOnScopeChains(BD, S, true);
846 Bindings.push_back(BD);
847 ParsingInitForAutoVars.insert(BD);
848 }
849
850 // There are no prior lookup results for the variable itself, because it
851 // is unnamed.
852 DeclarationNameInfo NameInfo((IdentifierInfo *)nullptr,
853 Decomp.getLSquareLoc());
854 LookupResult Previous(*this, NameInfo, LookupOrdinaryName,
855 ForVisibleRedeclaration);
856
857 // Build the variable that holds the non-decomposed object.
858 bool AddToScope = true;
859 NamedDecl *New =
860 ActOnVariableDeclarator(S, D, DC, TInfo, Previous,
861 MultiTemplateParamsArg(), AddToScope, Bindings);
862 if (AddToScope) {
863 S->AddDecl(New);
864 CurContext->addHiddenDecl(New);
865 }
866
867 if (isInOpenMPDeclareTargetContext())
868 checkDeclIsAllowedInOpenMPTarget(nullptr, New);
869
870 return New;
871}
872
873static bool checkSimpleDecomposition(
874 Sema &S, ArrayRef<BindingDecl *> Bindings, ValueDecl *Src,
875 QualType DecompType, const llvm::APSInt &NumElems, QualType ElemType,
876 llvm::function_ref<ExprResult(SourceLocation, Expr *, unsigned)> GetInit) {
877 if ((int64_t)Bindings.size() != NumElems) {
878 S.Diag(Src->getLocation(), diag::err_decomp_decl_wrong_number_bindings)
879 << DecompType << (unsigned)Bindings.size() << NumElems.toString(10)
880 << (NumElems < Bindings.size());
881 return true;
882 }
883
884 unsigned I = 0;
885 for (auto *B : Bindings) {
886 SourceLocation Loc = B->getLocation();
887 ExprResult E = S.BuildDeclRefExpr(Src, DecompType, VK_LValue, Loc);
888 if (E.isInvalid())
889 return true;
890 E = GetInit(Loc, E.get(), I++);
891 if (E.isInvalid())
892 return true;
893 B->setBinding(ElemType, E.get());
894 }
895
896 return false;
897}
898
899static bool checkArrayLikeDecomposition(Sema &S,
900 ArrayRef<BindingDecl *> Bindings,
901 ValueDecl *Src, QualType DecompType,
902 const llvm::APSInt &NumElems,
903 QualType ElemType) {
904 return checkSimpleDecomposition(
905 S, Bindings, Src, DecompType, NumElems, ElemType,
906 [&](SourceLocation Loc, Expr *Base, unsigned I) -> ExprResult {
907 ExprResult E = S.ActOnIntegerConstant(Loc, I);
908 if (E.isInvalid())
909 return ExprError();
910 return S.CreateBuiltinArraySubscriptExpr(Base, Loc, E.get(), Loc);
911 });
912}
913
914static bool checkArrayDecomposition(Sema &S, ArrayRef<BindingDecl*> Bindings,
915 ValueDecl *Src, QualType DecompType,
916 const ConstantArrayType *CAT) {
917 return checkArrayLikeDecomposition(S, Bindings, Src, DecompType,
918 llvm::APSInt(CAT->getSize()),
919 CAT->getElementType());
920}
921
922static bool checkVectorDecomposition(Sema &S, ArrayRef<BindingDecl*> Bindings,
923 ValueDecl *Src, QualType DecompType,
924 const VectorType *VT) {
925 return checkArrayLikeDecomposition(
926 S, Bindings, Src, DecompType, llvm::APSInt::get(VT->getNumElements()),
927 S.Context.getQualifiedType(VT->getElementType(),
928 DecompType.getQualifiers()));
929}
930
931static bool checkComplexDecomposition(Sema &S,
932 ArrayRef<BindingDecl *> Bindings,
933 ValueDecl *Src, QualType DecompType,
934 const ComplexType *CT) {
935 return checkSimpleDecomposition(
936 S, Bindings, Src, DecompType, llvm::APSInt::get(2),
937 S.Context.getQualifiedType(CT->getElementType(),
938 DecompType.getQualifiers()),
939 [&](SourceLocation Loc, Expr *Base, unsigned I) -> ExprResult {
940 return S.CreateBuiltinUnaryOp(Loc, I ? UO_Imag : UO_Real, Base);
941 });
942}
943
944static std::string printTemplateArgs(const PrintingPolicy &PrintingPolicy,
945 TemplateArgumentListInfo &Args) {
946 SmallString<128> SS;
947 llvm::raw_svector_ostream OS(SS);
948 bool First = true;
949 for (auto &Arg : Args.arguments()) {
950 if (!First)
951 OS << ", ";
952 Arg.getArgument().print(PrintingPolicy, OS);
953 First = false;
954 }
955 return OS.str();
956}
957
958static bool lookupStdTypeTraitMember(Sema &S, LookupResult &TraitMemberLookup,
959 SourceLocation Loc, StringRef Trait,
960 TemplateArgumentListInfo &Args,
961 unsigned DiagID) {
962 auto DiagnoseMissing = [&] {
963 if (DiagID)
964 S.Diag(Loc, DiagID) << printTemplateArgs(S.Context.getPrintingPolicy(),
965 Args);
966 return true;
967 };
968
969 // FIXME: Factor out duplication with lookupPromiseType in SemaCoroutine.
970 NamespaceDecl *Std = S.getStdNamespace();
971 if (!Std)
972 return DiagnoseMissing();
973
974 // Look up the trait itself, within namespace std. We can diagnose various
975 // problems with this lookup even if we've been asked to not diagnose a
976 // missing specialization, because this can only fail if the user has been
977 // declaring their own names in namespace std or we don't support the
978 // standard library implementation in use.
979 LookupResult Result(S, &S.PP.getIdentifierTable().get(Trait),
980 Loc, Sema::LookupOrdinaryName);
981 if (!S.LookupQualifiedName(Result, Std))
982 return DiagnoseMissing();
983 if (Result.isAmbiguous())
984 return true;
985
986 ClassTemplateDecl *TraitTD = Result.getAsSingle<ClassTemplateDecl>();
987 if (!TraitTD) {
988 Result.suppressDiagnostics();
989 NamedDecl *Found = *Result.begin();
990 S.Diag(Loc, diag::err_std_type_trait_not_class_template) << Trait;
991 S.Diag(Found->getLocation(), diag::note_declared_at);
992 return true;
993 }
994
995 // Build the template-id.
996 QualType TraitTy = S.CheckTemplateIdType(TemplateName(TraitTD), Loc, Args);
997 if (TraitTy.isNull())
998 return true;
999 if (!S.isCompleteType(Loc, TraitTy)) {
1000 if (DiagID)
1001 S.RequireCompleteType(
1002 Loc, TraitTy, DiagID,
1003 printTemplateArgs(S.Context.getPrintingPolicy(), Args));
1004 return true;
1005 }
1006
1007 CXXRecordDecl *RD = TraitTy->getAsCXXRecordDecl();
1008 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?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 1008, __PRETTY_FUNCTION__))
;
1009
1010 // Look up the member of the trait type.
1011 S.LookupQualifiedName(TraitMemberLookup, RD);
1012 return TraitMemberLookup.isAmbiguous();
1013}
1014
1015static TemplateArgumentLoc
1016getTrivialIntegralTemplateArgument(Sema &S, SourceLocation Loc, QualType T,
1017 uint64_t I) {
1018 TemplateArgument Arg(S.Context, S.Context.MakeIntValue(I, T), T);
1019 return S.getTrivialTemplateArgumentLoc(Arg, T, Loc);
1020}
1021
1022static TemplateArgumentLoc
1023getTrivialTypeTemplateArgument(Sema &S, SourceLocation Loc, QualType T) {
1024 return S.getTrivialTemplateArgumentLoc(TemplateArgument(T), QualType(), Loc);
1025}
1026
1027namespace { enum class IsTupleLike { TupleLike, NotTupleLike, Error }; }
1028
1029static IsTupleLike isTupleLike(Sema &S, SourceLocation Loc, QualType T,
1030 llvm::APSInt &Size) {
1031 EnterExpressionEvaluationContext ContextRAII(
1032 S, Sema::ExpressionEvaluationContext::ConstantEvaluated);
1033
1034 DeclarationName Value = S.PP.getIdentifierInfo("value");
1035 LookupResult R(S, Value, Loc, Sema::LookupOrdinaryName);
1036
1037 // Form template argument list for tuple_size<T>.
1038 TemplateArgumentListInfo Args(Loc, Loc);
1039 Args.addArgument(getTrivialTypeTemplateArgument(S, Loc, T));
1040
1041 // If there's no tuple_size specialization or the lookup of 'value' is empty,
1042 // it's not tuple-like.
1043 if (lookupStdTypeTraitMember(S, R, Loc, "tuple_size", Args, /*DiagID*/ 0) ||
1044 R.empty())
1045 return IsTupleLike::NotTupleLike;
1046
1047 // If we get this far, we've committed to the tuple interpretation, but
1048 // we can still fail if there actually isn't a usable ::value.
1049
1050 struct ICEDiagnoser : Sema::VerifyICEDiagnoser {
1051 LookupResult &R;
1052 TemplateArgumentListInfo &Args;
1053 ICEDiagnoser(LookupResult &R, TemplateArgumentListInfo &Args)
1054 : R(R), Args(Args) {}
1055 void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) {
1056 S.Diag(Loc, diag::err_decomp_decl_std_tuple_size_not_constant)
1057 << printTemplateArgs(S.Context.getPrintingPolicy(), Args);
1058 }
1059 } Diagnoser(R, Args);
1060
1061 ExprResult E =
1062 S.BuildDeclarationNameExpr(CXXScopeSpec(), R, /*NeedsADL*/false);
1063 if (E.isInvalid())
1064 return IsTupleLike::Error;
1065
1066 E = S.VerifyIntegerConstantExpression(E.get(), &Size, Diagnoser, false);
1067 if (E.isInvalid())
1068 return IsTupleLike::Error;
1069
1070 return IsTupleLike::TupleLike;
1071}
1072
1073/// \return std::tuple_element<I, T>::type.
1074static QualType getTupleLikeElementType(Sema &S, SourceLocation Loc,
1075 unsigned I, QualType T) {
1076 // Form template argument list for tuple_element<I, T>.
1077 TemplateArgumentListInfo Args(Loc, Loc);
1078 Args.addArgument(
1079 getTrivialIntegralTemplateArgument(S, Loc, S.Context.getSizeType(), I));
1080 Args.addArgument(getTrivialTypeTemplateArgument(S, Loc, T));
1081
1082 DeclarationName TypeDN = S.PP.getIdentifierInfo("type");
1083 LookupResult R(S, TypeDN, Loc, Sema::LookupOrdinaryName);
1084 if (lookupStdTypeTraitMember(
1085 S, R, Loc, "tuple_element", Args,
1086 diag::err_decomp_decl_std_tuple_element_not_specialized))
1087 return QualType();
1088
1089 auto *TD = R.getAsSingle<TypeDecl>();
1090 if (!TD) {
1091 R.suppressDiagnostics();
1092 S.Diag(Loc, diag::err_decomp_decl_std_tuple_element_not_specialized)
1093 << printTemplateArgs(S.Context.getPrintingPolicy(), Args);
1094 if (!R.empty())
1095 S.Diag(R.getRepresentativeDecl()->getLocation(), diag::note_declared_at);
1096 return QualType();
1097 }
1098
1099 return S.Context.getTypeDeclType(TD);
1100}
1101
1102namespace {
1103struct BindingDiagnosticTrap {
1104 Sema &S;
1105 DiagnosticErrorTrap Trap;
1106 BindingDecl *BD;
1107
1108 BindingDiagnosticTrap(Sema &S, BindingDecl *BD)
1109 : S(S), Trap(S.Diags), BD(BD) {}
1110 ~BindingDiagnosticTrap() {
1111 if (Trap.hasErrorOccurred())
1112 S.Diag(BD->getLocation(), diag::note_in_binding_decl_init) << BD;
1113 }
1114};
1115}
1116
1117static bool checkTupleLikeDecomposition(Sema &S,
1118 ArrayRef<BindingDecl *> Bindings,
1119 VarDecl *Src, QualType DecompType,
1120 const llvm::APSInt &TupleSize) {
1121 if ((int64_t)Bindings.size() != TupleSize) {
1122 S.Diag(Src->getLocation(), diag::err_decomp_decl_wrong_number_bindings)
1123 << DecompType << (unsigned)Bindings.size() << TupleSize.toString(10)
1124 << (TupleSize < Bindings.size());
1125 return true;
1126 }
1127
1128 if (Bindings.empty())
1129 return false;
1130
1131 DeclarationName GetDN = S.PP.getIdentifierInfo("get");
1132
1133 // [dcl.decomp]p3:
1134 // The unqualified-id get is looked up in the scope of E by class member
1135 // access lookup ...
1136 LookupResult MemberGet(S, GetDN, Src->getLocation(), Sema::LookupMemberName);
1137 bool UseMemberGet = false;
1138 if (S.isCompleteType(Src->getLocation(), DecompType)) {
1139 if (auto *RD = DecompType->getAsCXXRecordDecl())
1140 S.LookupQualifiedName(MemberGet, RD);
1141 if (MemberGet.isAmbiguous())
1142 return true;
1143 // ... and if that finds at least one declaration that is a function
1144 // template whose first template parameter is a non-type parameter ...
1145 for (NamedDecl *D : MemberGet) {
1146 if (FunctionTemplateDecl *FTD =
1147 dyn_cast<FunctionTemplateDecl>(D->getUnderlyingDecl())) {
1148 TemplateParameterList *TPL = FTD->getTemplateParameters();
1149 if (TPL->size() != 0 &&
1150 isa<NonTypeTemplateParmDecl>(TPL->getParam(0))) {
1151 // ... the initializer is e.get<i>().
1152 UseMemberGet = true;
1153 break;
1154 }
1155 }
1156 }
1157 }
1158
1159 unsigned I = 0;
1160 for (auto *B : Bindings) {
1161 BindingDiagnosticTrap Trap(S, B);
1162 SourceLocation Loc = B->getLocation();
1163
1164 ExprResult E = S.BuildDeclRefExpr(Src, DecompType, VK_LValue, Loc);
1165 if (E.isInvalid())
1166 return true;
1167
1168 // e is an lvalue if the type of the entity is an lvalue reference and
1169 // an xvalue otherwise
1170 if (!Src->getType()->isLValueReferenceType())
1171 E = ImplicitCastExpr::Create(S.Context, E.get()->getType(), CK_NoOp,
1172 E.get(), nullptr, VK_XValue);
1173
1174 TemplateArgumentListInfo Args(Loc, Loc);
1175 Args.addArgument(
1176 getTrivialIntegralTemplateArgument(S, Loc, S.Context.getSizeType(), I));
1177
1178 if (UseMemberGet) {
1179 // if [lookup of member get] finds at least one declaration, the
1180 // initializer is e.get<i-1>().
1181 E = S.BuildMemberReferenceExpr(E.get(), DecompType, Loc, false,
1182 CXXScopeSpec(), SourceLocation(), nullptr,
1183 MemberGet, &Args, nullptr);
1184 if (E.isInvalid())
1185 return true;
1186
1187 E = S.BuildCallExpr(nullptr, E.get(), Loc, None, Loc);
1188 } else {
1189 // Otherwise, the initializer is get<i-1>(e), where get is looked up
1190 // in the associated namespaces.
1191 Expr *Get = UnresolvedLookupExpr::Create(
1192 S.Context, nullptr, NestedNameSpecifierLoc(), SourceLocation(),
1193 DeclarationNameInfo(GetDN, Loc), /*RequiresADL*/true, &Args,
1194 UnresolvedSetIterator(), UnresolvedSetIterator());
1195
1196 Expr *Arg = E.get();
1197 E = S.BuildCallExpr(nullptr, Get, Loc, Arg, Loc);
1198 }
1199 if (E.isInvalid())
1200 return true;
1201 Expr *Init = E.get();
1202
1203 // Given the type T designated by std::tuple_element<i - 1, E>::type,
1204 QualType T = getTupleLikeElementType(S, Loc, I, DecompType);
1205 if (T.isNull())
1206 return true;
1207
1208 // each vi is a variable of type "reference to T" initialized with the
1209 // initializer, where the reference is an lvalue reference if the
1210 // initializer is an lvalue and an rvalue reference otherwise
1211 QualType RefType =
1212 S.BuildReferenceType(T, E.get()->isLValue(), Loc, B->getDeclName());
1213 if (RefType.isNull())
1214 return true;
1215 auto *RefVD = VarDecl::Create(
1216 S.Context, Src->getDeclContext(), Loc, Loc,
1217 B->getDeclName().getAsIdentifierInfo(), RefType,
1218 S.Context.getTrivialTypeSourceInfo(T, Loc), Src->getStorageClass());
1219 RefVD->setLexicalDeclContext(Src->getLexicalDeclContext());
1220 RefVD->setTSCSpec(Src->getTSCSpec());
1221 RefVD->setImplicit();
1222 if (Src->isInlineSpecified())
1223 RefVD->setInlineSpecified();
1224 RefVD->getLexicalDeclContext()->addHiddenDecl(RefVD);
1225
1226 InitializedEntity Entity = InitializedEntity::InitializeBinding(RefVD);
1227 InitializationKind Kind = InitializationKind::CreateCopy(Loc, Loc);
1228 InitializationSequence Seq(S, Entity, Kind, Init);
1229 E = Seq.Perform(S, Entity, Kind, Init);
1230 if (E.isInvalid())
1231 return true;
1232 E = S.ActOnFinishFullExpr(E.get(), Loc, /*DiscardedValue*/ false);
1233 if (E.isInvalid())
1234 return true;
1235 RefVD->setInit(E.get());
1236 if (!E.get()->isValueDependent())
1237 RefVD->checkInitIsICE();
1238
1239 E = S.BuildDeclarationNameExpr(CXXScopeSpec(),
1240 DeclarationNameInfo(B->getDeclName(), Loc),
1241 RefVD);
1242 if (E.isInvalid())
1243 return true;
1244
1245 B->setBinding(T, E.get());
1246 I++;
1247 }
1248
1249 return false;
1250}
1251
1252/// Find the base class to decompose in a built-in decomposition of a class type.
1253/// This base class search is, unfortunately, not quite like any other that we
1254/// perform anywhere else in C++.
1255static DeclAccessPair findDecomposableBaseClass(Sema &S, SourceLocation Loc,
1256 const CXXRecordDecl *RD,
1257 CXXCastPath &BasePath) {
1258 auto BaseHasFields = [](const CXXBaseSpecifier *Specifier,
1259 CXXBasePath &Path) {
1260 return Specifier->getType()->getAsCXXRecordDecl()->hasDirectFields();
1261 };
1262
1263 const CXXRecordDecl *ClassWithFields = nullptr;
1264 AccessSpecifier AS = AS_public;
1265 if (RD->hasDirectFields())
1266 // [dcl.decomp]p4:
1267 // Otherwise, all of E's non-static data members shall be public direct
1268 // members of E ...
1269 ClassWithFields = RD;
1270 else {
1271 // ... or of ...
1272 CXXBasePaths Paths;
1273 Paths.setOrigin(const_cast<CXXRecordDecl*>(RD));
1274 if (!RD->lookupInBases(BaseHasFields, Paths)) {
1275 // If no classes have fields, just decompose RD itself. (This will work
1276 // if and only if zero bindings were provided.)
1277 return DeclAccessPair::make(const_cast<CXXRecordDecl*>(RD), AS_public);
1278 }
1279
1280 CXXBasePath *BestPath = nullptr;
1281 for (auto &P : Paths) {
1282 if (!BestPath)
1283 BestPath = &P;
1284 else if (!S.Context.hasSameType(P.back().Base->getType(),
1285 BestPath->back().Base->getType())) {
1286 // ... the same ...
1287 S.Diag(Loc, diag::err_decomp_decl_multiple_bases_with_members)
1288 << false << RD << BestPath->back().Base->getType()
1289 << P.back().Base->getType();
1290 return DeclAccessPair();
1291 } else if (P.Access < BestPath->Access) {
1292 BestPath = &P;
1293 }
1294 }
1295
1296 // ... unambiguous ...
1297 QualType BaseType = BestPath->back().Base->getType();
1298 if (Paths.isAmbiguous(S.Context.getCanonicalType(BaseType))) {
1299 S.Diag(Loc, diag::err_decomp_decl_ambiguous_base)
1300 << RD << BaseType << S.getAmbiguousPathsDisplayString(Paths);
1301 return DeclAccessPair();
1302 }
1303
1304 // ... [accessible, implied by other rules] base class of E.
1305 S.CheckBaseClassAccess(Loc, BaseType, S.Context.getRecordType(RD),
1306 *BestPath, diag::err_decomp_decl_inaccessible_base);
1307 AS = BestPath->Access;
1308
1309 ClassWithFields = BaseType->getAsCXXRecordDecl();
1310 S.BuildBasePathArray(Paths, BasePath);
1311 }
1312
1313 // The above search did not check whether the selected class itself has base
1314 // classes with fields, so check that now.
1315 CXXBasePaths Paths;
1316 if (ClassWithFields->lookupInBases(BaseHasFields, Paths)) {
1317 S.Diag(Loc, diag::err_decomp_decl_multiple_bases_with_members)
1318 << (ClassWithFields == RD) << RD << ClassWithFields
1319 << Paths.front().back().Base->getType();
1320 return DeclAccessPair();
1321 }
1322
1323 return DeclAccessPair::make(const_cast<CXXRecordDecl*>(ClassWithFields), AS);
1324}
1325
1326static bool checkMemberDecomposition(Sema &S, ArrayRef<BindingDecl*> Bindings,
1327 ValueDecl *Src, QualType DecompType,
1328 const CXXRecordDecl *OrigRD) {
1329 if (S.RequireCompleteType(Src->getLocation(), DecompType,
1330 diag::err_incomplete_type))
1331 return true;
1332
1333 CXXCastPath BasePath;
1334 DeclAccessPair BasePair =
1335 findDecomposableBaseClass(S, Src->getLocation(), OrigRD, BasePath);
1336 const CXXRecordDecl *RD = cast_or_null<CXXRecordDecl>(BasePair.getDecl());
1337 if (!RD)
1338 return true;
1339 QualType BaseType = S.Context.getQualifiedType(S.Context.getRecordType(RD),
1340 DecompType.getQualifiers());
1341
1342 auto DiagnoseBadNumberOfBindings = [&]() -> bool {
1343 unsigned NumFields =
1344 std::count_if(RD->field_begin(), RD->field_end(),
1345 [](FieldDecl *FD) { return !FD->isUnnamedBitfield(); });
1346 assert(Bindings.size() != NumFields)((Bindings.size() != NumFields) ? static_cast<void> (0)
: __assert_fail ("Bindings.size() != NumFields", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 1346, __PRETTY_FUNCTION__))
;
1347 S.Diag(Src->getLocation(), diag::err_decomp_decl_wrong_number_bindings)
1348 << DecompType << (unsigned)Bindings.size() << NumFields
1349 << (NumFields < Bindings.size());
1350 return true;
1351 };
1352
1353 // all of E's non-static data members shall be [...] well-formed
1354 // when named as e.name in the context of the structured binding,
1355 // E shall not have an anonymous union member, ...
1356 unsigned I = 0;
1357 for (auto *FD : RD->fields()) {
1358 if (FD->isUnnamedBitfield())
1359 continue;
1360
1361 if (FD->isAnonymousStructOrUnion()) {
1362 S.Diag(Src->getLocation(), diag::err_decomp_decl_anon_union_member)
1363 << DecompType << FD->getType()->isUnionType();
1364 S.Diag(FD->getLocation(), diag::note_declared_at);
1365 return true;
1366 }
1367
1368 // We have a real field to bind.
1369 if (I >= Bindings.size())
1370 return DiagnoseBadNumberOfBindings();
1371 auto *B = Bindings[I++];
1372 SourceLocation Loc = B->getLocation();
1373
1374 // The field must be accessible in the context of the structured binding.
1375 // We already checked that the base class is accessible.
1376 // FIXME: Add 'const' to AccessedEntity's classes so we can remove the
1377 // const_cast here.
1378 S.CheckStructuredBindingMemberAccess(
1379 Loc, const_cast<CXXRecordDecl *>(OrigRD),
1380 DeclAccessPair::make(FD, CXXRecordDecl::MergeAccess(
1381 BasePair.getAccess(), FD->getAccess())));
1382
1383 // Initialize the binding to Src.FD.
1384 ExprResult E = S.BuildDeclRefExpr(Src, DecompType, VK_LValue, Loc);
1385 if (E.isInvalid())
1386 return true;
1387 E = S.ImpCastExprToType(E.get(), BaseType, CK_UncheckedDerivedToBase,
1388 VK_LValue, &BasePath);
1389 if (E.isInvalid())
1390 return true;
1391 E = S.BuildFieldReferenceExpr(E.get(), /*IsArrow*/ false, Loc,
1392 CXXScopeSpec(), FD,
1393 DeclAccessPair::make(FD, FD->getAccess()),
1394 DeclarationNameInfo(FD->getDeclName(), Loc));
1395 if (E.isInvalid())
1396 return true;
1397
1398 // If the type of the member is T, the referenced type is cv T, where cv is
1399 // the cv-qualification of the decomposition expression.
1400 //
1401 // FIXME: We resolve a defect here: if the field is mutable, we do not add
1402 // 'const' to the type of the field.
1403 Qualifiers Q = DecompType.getQualifiers();
1404 if (FD->isMutable())
1405 Q.removeConst();
1406 B->setBinding(S.BuildQualifiedType(FD->getType(), Loc, Q), E.get());
1407 }
1408
1409 if (I != Bindings.size())
1410 return DiagnoseBadNumberOfBindings();
1411
1412 return false;
1413}
1414
1415void Sema::CheckCompleteDecompositionDeclaration(DecompositionDecl *DD) {
1416 QualType DecompType = DD->getType();
1417
1418 // If the type of the decomposition is dependent, then so is the type of
1419 // each binding.
1420 if (DecompType->isDependentType()) {
1421 for (auto *B : DD->bindings())
1422 B->setType(Context.DependentTy);
1423 return;
1424 }
1425
1426 DecompType = DecompType.getNonReferenceType();
1427 ArrayRef<BindingDecl*> Bindings = DD->bindings();
1428
1429 // C++1z [dcl.decomp]/2:
1430 // If E is an array type [...]
1431 // As an extension, we also support decomposition of built-in complex and
1432 // vector types.
1433 if (auto *CAT = Context.getAsConstantArrayType(DecompType)) {
1434 if (checkArrayDecomposition(*this, Bindings, DD, DecompType, CAT))
1435 DD->setInvalidDecl();
1436 return;
1437 }
1438 if (auto *VT = DecompType->getAs<VectorType>()) {
1439 if (checkVectorDecomposition(*this, Bindings, DD, DecompType, VT))
1440 DD->setInvalidDecl();
1441 return;
1442 }
1443 if (auto *CT = DecompType->getAs<ComplexType>()) {
1444 if (checkComplexDecomposition(*this, Bindings, DD, DecompType, CT))
1445 DD->setInvalidDecl();
1446 return;
1447 }
1448
1449 // C++1z [dcl.decomp]/3:
1450 // if the expression std::tuple_size<E>::value is a well-formed integral
1451 // constant expression, [...]
1452 llvm::APSInt TupleSize(32);
1453 switch (isTupleLike(*this, DD->getLocation(), DecompType, TupleSize)) {
1454 case IsTupleLike::Error:
1455 DD->setInvalidDecl();
1456 return;
1457
1458 case IsTupleLike::TupleLike:
1459 if (checkTupleLikeDecomposition(*this, Bindings, DD, DecompType, TupleSize))
1460 DD->setInvalidDecl();
1461 return;
1462
1463 case IsTupleLike::NotTupleLike:
1464 break;
1465 }
1466
1467 // C++1z [dcl.dcl]/8:
1468 // [E shall be of array or non-union class type]
1469 CXXRecordDecl *RD = DecompType->getAsCXXRecordDecl();
1470 if (!RD || RD->isUnion()) {
1471 Diag(DD->getLocation(), diag::err_decomp_decl_unbindable_type)
1472 << DD << !RD << DecompType;
1473 DD->setInvalidDecl();
1474 return;
1475 }
1476
1477 // C++1z [dcl.decomp]/4:
1478 // all of E's non-static data members shall be [...] direct members of
1479 // E or of the same unambiguous public base class of E, ...
1480 if (checkMemberDecomposition(*this, Bindings, DD, DecompType, RD))
1481 DD->setInvalidDecl();
1482}
1483
1484/// Merge the exception specifications of two variable declarations.
1485///
1486/// This is called when there's a redeclaration of a VarDecl. The function
1487/// checks if the redeclaration might have an exception specification and
1488/// validates compatibility and merges the specs if necessary.
1489void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) {
1490 // Shortcut if exceptions are disabled.
1491 if (!getLangOpts().CXXExceptions)
1
Assuming field 'CXXExceptions' is not equal to 0
2
Taking false branch
1492 return;
1493
1494 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.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 1495, __PRETTY_FUNCTION__))
3
Assuming the condition is true
4
'?' condition is true
1495 "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.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 1495, __PRETTY_FUNCTION__))
;
1496
1497 QualType NewType = New->getType();
1498 QualType OldType = Old->getType();
1499
1500 // We're only interested in pointers and references to functions, as well
1501 // as pointers to member functions.
1502 if (const ReferenceType *R
5.1
'R' is null
= NewType->getAs<ReferenceType>()) {
5
Assuming the object is not a 'ReferenceType'
6
Taking false branch
1503 NewType = R->getPointeeType();
1504 OldType = OldType->getAs<ReferenceType>()->getPointeeType();
1505 } else if (const PointerType *P = NewType->getAs<PointerType>()) {
7
Assuming the object is a 'PointerType'
8
Assuming 'P' is non-null
9
Taking true branch
1506 NewType = P->getPointeeType();
1507 OldType = OldType->getAs<PointerType>()->getPointeeType();
10
Assuming the object is not a 'PointerType'
11
Called C++ object pointer is null
1508 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) {
1509 NewType = M->getPointeeType();
1510 OldType = OldType->getAs<MemberPointerType>()->getPointeeType();
1511 }
1512
1513 if (!NewType->isFunctionProtoType())
1514 return;
1515
1516 // There's lots of special cases for functions. For function pointers, system
1517 // libraries are hopefully not as broken so that we don't need these
1518 // workarounds.
1519 if (CheckEquivalentExceptionSpec(
1520 OldType->getAs<FunctionProtoType>(), Old->getLocation(),
1521 NewType->getAs<FunctionProtoType>(), New->getLocation())) {
1522 New->setInvalidDecl();
1523 }
1524}
1525
1526/// CheckCXXDefaultArguments - Verify that the default arguments for a
1527/// function declaration are well-formed according to C++
1528/// [dcl.fct.default].
1529void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) {
1530 unsigned NumParams = FD->getNumParams();
1531 unsigned p;
1532
1533 // Find first parameter with a default argument
1534 for (p = 0; p < NumParams; ++p) {
1535 ParmVarDecl *Param = FD->getParamDecl(p);
1536 if (Param->hasDefaultArg())
1537 break;
1538 }
1539
1540 // C++11 [dcl.fct.default]p4:
1541 // In a given function declaration, each parameter subsequent to a parameter
1542 // with a default argument shall have a default argument supplied in this or
1543 // a previous declaration or shall be a function parameter pack. A default
1544 // argument shall not be redefined by a later declaration (not even to the
1545 // same value).
1546 unsigned LastMissingDefaultArg = 0;
1547 for (; p < NumParams; ++p) {
1548 ParmVarDecl *Param = FD->getParamDecl(p);
1549 if (!Param->hasDefaultArg() && !Param->isParameterPack()) {
1550 if (Param->isInvalidDecl())
1551 /* We already complained about this parameter. */;
1552 else if (Param->getIdentifier())
1553 Diag(Param->getLocation(),
1554 diag::err_param_default_argument_missing_name)
1555 << Param->getIdentifier();
1556 else
1557 Diag(Param->getLocation(),
1558 diag::err_param_default_argument_missing);
1559
1560 LastMissingDefaultArg = p;
1561 }
1562 }
1563
1564 if (LastMissingDefaultArg > 0) {
1565 // Some default arguments were missing. Clear out all of the
1566 // default arguments up to (and including) the last missing
1567 // default argument, so that we leave the function parameters
1568 // in a semantically valid state.
1569 for (p = 0; p <= LastMissingDefaultArg; ++p) {
1570 ParmVarDecl *Param = FD->getParamDecl(p);
1571 if (Param->hasDefaultArg()) {
1572 Param->setDefaultArg(nullptr);
1573 }
1574 }
1575 }
1576}
1577
1578/// Check that the given type is a literal type. Issue a diagnostic if not,
1579/// if Kind is Diagnose.
1580/// \return \c true if a problem has been found (and optionally diagnosed).
1581template <typename... Ts>
1582static bool CheckLiteralType(Sema &SemaRef, Sema::CheckConstexprKind Kind,
1583 SourceLocation Loc, QualType T, unsigned DiagID,
1584 Ts &&...DiagArgs) {
1585 if (T->isDependentType())
1586 return false;
1587
1588 switch (Kind) {
1589 case Sema::CheckConstexprKind::Diagnose:
1590 return SemaRef.RequireLiteralType(Loc, T, DiagID,
1591 std::forward<Ts>(DiagArgs)...);
1592
1593 case Sema::CheckConstexprKind::CheckValid:
1594 return !T->isLiteralType(SemaRef.Context);
1595 }
1596
1597 llvm_unreachable("unknown CheckConstexprKind")::llvm::llvm_unreachable_internal("unknown CheckConstexprKind"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 1597)
;
1598}
1599
1600/// Determine whether a destructor cannot be constexpr due to
1601static bool CheckConstexprDestructorSubobjects(Sema &SemaRef,
1602 const CXXDestructorDecl *DD,
1603 Sema::CheckConstexprKind Kind) {
1604 auto Check = [&](SourceLocation Loc, QualType T, const FieldDecl *FD) {
1605 const CXXRecordDecl *RD =
1606 T->getBaseElementTypeUnsafe()->getAsCXXRecordDecl();
1607 if (!RD || RD->hasConstexprDestructor())
1608 return true;
1609
1610 if (Kind == Sema::CheckConstexprKind::Diagnose) {
1611 SemaRef.Diag(DD->getLocation(), diag::err_constexpr_dtor_subobject)
1612 << DD->getConstexprKind() << !FD
1613 << (FD ? FD->getDeclName() : DeclarationName()) << T;
1614 SemaRef.Diag(Loc, diag::note_constexpr_dtor_subobject)
1615 << !FD << (FD ? FD->getDeclName() : DeclarationName()) << T;
1616 }
1617 return false;
1618 };
1619
1620 const CXXRecordDecl *RD = DD->getParent();
1621 for (const CXXBaseSpecifier &B : RD->bases())
1622 if (!Check(B.getBaseTypeLoc(), B.getType(), nullptr))
1623 return false;
1624 for (const FieldDecl *FD : RD->fields())
1625 if (!Check(FD->getLocation(), FD->getType(), FD))
1626 return false;
1627 return true;
1628}
1629
1630/// Check whether a function's parameter types are all literal types. If so,
1631/// return true. If not, produce a suitable diagnostic and return false.
1632static bool CheckConstexprParameterTypes(Sema &SemaRef,
1633 const FunctionDecl *FD,
1634 Sema::CheckConstexprKind Kind) {
1635 unsigned ArgIndex = 0;
1636 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>();
1637 for (FunctionProtoType::param_type_iterator i = FT->param_type_begin(),
1638 e = FT->param_type_end();
1639 i != e; ++i, ++ArgIndex) {
1640 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex);
1641 SourceLocation ParamLoc = PD->getLocation();
1642 if (CheckLiteralType(SemaRef, Kind, ParamLoc, *i,
1643 diag::err_constexpr_non_literal_param, ArgIndex + 1,
1644 PD->getSourceRange(), isa<CXXConstructorDecl>(FD),
1645 FD->isConsteval()))
1646 return false;
1647 }
1648 return true;
1649}
1650
1651/// Check whether a function's return type is a literal type. If so, return
1652/// true. If not, produce a suitable diagnostic and return false.
1653static bool CheckConstexprReturnType(Sema &SemaRef, const FunctionDecl *FD,
1654 Sema::CheckConstexprKind Kind) {
1655 if (CheckLiteralType(SemaRef, Kind, FD->getLocation(), FD->getReturnType(),
1656 diag::err_constexpr_non_literal_return,
1657 FD->isConsteval()))
1658 return false;
1659 return true;
1660}
1661
1662/// Get diagnostic %select index for tag kind for
1663/// record diagnostic message.
1664/// WARNING: Indexes apply to particular diagnostics only!
1665///
1666/// \returns diagnostic %select index.
1667static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) {
1668 switch (Tag) {
1669 case TTK_Struct: return 0;
1670 case TTK_Interface: return 1;
1671 case TTK_Class: return 2;
1672 default: llvm_unreachable("Invalid tag kind for record diagnostic!")::llvm::llvm_unreachable_internal("Invalid tag kind for record diagnostic!"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 1672)
;
1673 }
1674}
1675
1676static bool CheckConstexprFunctionBody(Sema &SemaRef, const FunctionDecl *Dcl,
1677 Stmt *Body,
1678 Sema::CheckConstexprKind Kind);
1679
1680// Check whether a function declaration satisfies the requirements of a
1681// constexpr function definition or a constexpr constructor definition. If so,
1682// return true. If not, produce appropriate diagnostics (unless asked not to by
1683// Kind) and return false.
1684//
1685// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360.
1686bool Sema::CheckConstexprFunctionDefinition(const FunctionDecl *NewFD,
1687 CheckConstexprKind Kind) {
1688 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD);
1689 if (MD && MD->isInstance()) {
1690 // C++11 [dcl.constexpr]p4:
1691 // The definition of a constexpr constructor shall satisfy the following
1692 // constraints:
1693 // - the class shall not have any virtual base classes;
1694 //
1695 // FIXME: This only applies to constructors and destructors, not arbitrary
1696 // member functions.
1697 const CXXRecordDecl *RD = MD->getParent();
1698 if (RD->getNumVBases()) {
1699 if (Kind == CheckConstexprKind::CheckValid)
1700 return false;
1701
1702 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base)
1703 << isa<CXXConstructorDecl>(NewFD)
1704 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases();
1705 for (const auto &I : RD->vbases())
1706 Diag(I.getBeginLoc(), diag::note_constexpr_virtual_base_here)
1707 << I.getSourceRange();
1708 return false;
1709 }
1710 }
1711
1712 if (!isa<CXXConstructorDecl>(NewFD)) {
1713 // C++11 [dcl.constexpr]p3:
1714 // The definition of a constexpr function shall satisfy the following
1715 // constraints:
1716 // - it shall not be virtual; (removed in C++20)
1717 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD);
1718 if (Method && Method->isVirtual()) {
1719 if (getLangOpts().CPlusPlus2a) {
1720 if (Kind == CheckConstexprKind::Diagnose)
1721 Diag(Method->getLocation(), diag::warn_cxx17_compat_constexpr_virtual);
1722 } else {
1723 if (Kind == CheckConstexprKind::CheckValid)
1724 return false;
1725
1726 Method = Method->getCanonicalDecl();
1727 Diag(Method->getLocation(), diag::err_constexpr_virtual);
1728
1729 // If it's not obvious why this function is virtual, find an overridden
1730 // function which uses the 'virtual' keyword.
1731 const CXXMethodDecl *WrittenVirtual = Method;
1732 while (!WrittenVirtual->isVirtualAsWritten())
1733 WrittenVirtual = *WrittenVirtual->begin_overridden_methods();
1734 if (WrittenVirtual != Method)
1735 Diag(WrittenVirtual->getLocation(),
1736 diag::note_overridden_virtual_function);
1737 return false;
1738 }
1739 }
1740
1741 // - its return type shall be a literal type;
1742 if (!CheckConstexprReturnType(*this, NewFD, Kind))
1743 return false;
1744 }
1745
1746 if (auto *Dtor = dyn_cast<CXXDestructorDecl>(NewFD)) {
1747 // A destructor can be constexpr only if the defaulted destructor could be;
1748 // we don't need to check the members and bases if we already know they all
1749 // have constexpr destructors.
1750 if (!Dtor->getParent()->defaultedDestructorIsConstexpr()) {
1751 if (Kind == CheckConstexprKind::CheckValid)
1752 return false;
1753 if (!CheckConstexprDestructorSubobjects(*this, Dtor, Kind))
1754 return false;
1755 }
1756 }
1757
1758 // - each of its parameter types shall be a literal type;
1759 if (!CheckConstexprParameterTypes(*this, NewFD, Kind))
1760 return false;
1761
1762 Stmt *Body = NewFD->getBody();
1763 assert(Body &&((Body && "CheckConstexprFunctionDefinition called on function with no body"
) ? static_cast<void> (0) : __assert_fail ("Body && \"CheckConstexprFunctionDefinition called on function with no body\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 1764, __PRETTY_FUNCTION__))
1764 "CheckConstexprFunctionDefinition called on function with no body")((Body && "CheckConstexprFunctionDefinition called on function with no body"
) ? static_cast<void> (0) : __assert_fail ("Body && \"CheckConstexprFunctionDefinition called on function with no body\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 1764, __PRETTY_FUNCTION__))
;
1765 return CheckConstexprFunctionBody(*this, NewFD, Body, Kind);
1766}
1767
1768/// Check the given declaration statement is legal within a constexpr function
1769/// body. C++11 [dcl.constexpr]p3,p4, and C++1y [dcl.constexpr]p3.
1770///
1771/// \return true if the body is OK (maybe only as an extension), false if we
1772/// have diagnosed a problem.
1773static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl,
1774 DeclStmt *DS, SourceLocation &Cxx1yLoc,
1775 Sema::CheckConstexprKind Kind) {
1776 // C++11 [dcl.constexpr]p3 and p4:
1777 // The definition of a constexpr function(p3) or constructor(p4) [...] shall
1778 // contain only
1779 for (const auto *DclIt : DS->decls()) {
1780 switch (DclIt->getKind()) {
1781 case Decl::StaticAssert:
1782 case Decl::Using:
1783 case Decl::UsingShadow:
1784 case Decl::UsingDirective:
1785 case Decl::UnresolvedUsingTypename:
1786 case Decl::UnresolvedUsingValue:
1787 // - static_assert-declarations
1788 // - using-declarations,
1789 // - using-directives,
1790 continue;
1791
1792 case Decl::Typedef:
1793 case Decl::TypeAlias: {
1794 // - typedef declarations and alias-declarations that do not define
1795 // classes or enumerations,
1796 const auto *TN = cast<TypedefNameDecl>(DclIt);
1797 if (TN->getUnderlyingType()->isVariablyModifiedType()) {
1798 // Don't allow variably-modified types in constexpr functions.
1799 if (Kind == Sema::CheckConstexprKind::Diagnose) {
1800 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc();
1801 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla)
1802 << TL.getSourceRange() << TL.getType()
1803 << isa<CXXConstructorDecl>(Dcl);
1804 }
1805 return false;
1806 }
1807 continue;
1808 }
1809
1810 case Decl::Enum:
1811 case Decl::CXXRecord:
1812 // C++1y allows types to be defined, not just declared.
1813 if (cast<TagDecl>(DclIt)->isThisDeclarationADefinition()) {
1814 if (Kind == Sema::CheckConstexprKind::Diagnose) {
1815 SemaRef.Diag(DS->getBeginLoc(),
1816 SemaRef.getLangOpts().CPlusPlus14
1817 ? diag::warn_cxx11_compat_constexpr_type_definition
1818 : diag::ext_constexpr_type_definition)
1819 << isa<CXXConstructorDecl>(Dcl);
1820 } else if (!SemaRef.getLangOpts().CPlusPlus14) {
1821 return false;
1822 }
1823 }
1824 continue;
1825
1826 case Decl::EnumConstant:
1827 case Decl::IndirectField:
1828 case Decl::ParmVar:
1829 // These can only appear with other declarations which are banned in
1830 // C++11 and permitted in C++1y, so ignore them.
1831 continue;
1832
1833 case Decl::Var:
1834 case Decl::Decomposition: {
1835 // C++1y [dcl.constexpr]p3 allows anything except:
1836 // a definition of a variable of non-literal type or of static or
1837 // thread storage duration or [before C++2a] for which no
1838 // initialization is performed.
1839 const auto *VD = cast<VarDecl>(DclIt);
1840 if (VD->isThisDeclarationADefinition()) {
1841 if (VD->isStaticLocal()) {
1842 if (Kind == Sema::CheckConstexprKind::Diagnose) {
1843 SemaRef.Diag(VD->getLocation(),
1844 diag::err_constexpr_local_var_static)
1845 << isa<CXXConstructorDecl>(Dcl)
1846 << (VD->getTLSKind() == VarDecl::TLS_Dynamic);
1847 }
1848 return false;
1849 }
1850 if (CheckLiteralType(SemaRef, Kind, VD->getLocation(), VD->getType(),
1851 diag::err_constexpr_local_var_non_literal_type,
1852 isa<CXXConstructorDecl>(Dcl)))
1853 return false;
1854 if (!VD->getType()->isDependentType() &&
1855 !VD->hasInit() && !VD->isCXXForRangeDecl()) {
1856 if (Kind == Sema::CheckConstexprKind::Diagnose) {
1857 SemaRef.Diag(
1858 VD->getLocation(),
1859 SemaRef.getLangOpts().CPlusPlus2a
1860 ? diag::warn_cxx17_compat_constexpr_local_var_no_init
1861 : diag::ext_constexpr_local_var_no_init)
1862 << isa<CXXConstructorDecl>(Dcl);
1863 } else if (!SemaRef.getLangOpts().CPlusPlus2a) {
1864 return false;
1865 }
1866 continue;
1867 }
1868 }
1869 if (Kind == Sema::CheckConstexprKind::Diagnose) {
1870 SemaRef.Diag(VD->getLocation(),
1871 SemaRef.getLangOpts().CPlusPlus14
1872 ? diag::warn_cxx11_compat_constexpr_local_var
1873 : diag::ext_constexpr_local_var)
1874 << isa<CXXConstructorDecl>(Dcl);
1875 } else if (!SemaRef.getLangOpts().CPlusPlus14) {
1876 return false;
1877 }
1878 continue;
1879 }
1880
1881 case Decl::NamespaceAlias:
1882 case Decl::Function:
1883 // These are disallowed in C++11 and permitted in C++1y. Allow them
1884 // everywhere as an extension.
1885 if (!Cxx1yLoc.isValid())
1886 Cxx1yLoc = DS->getBeginLoc();
1887 continue;
1888
1889 default:
1890 if (Kind == Sema::CheckConstexprKind::Diagnose) {
1891 SemaRef.Diag(DS->getBeginLoc(), diag::err_constexpr_body_invalid_stmt)
1892 << isa<CXXConstructorDecl>(Dcl) << Dcl->isConsteval();
1893 }
1894 return false;
1895 }
1896 }
1897
1898 return true;
1899}
1900
1901/// Check that the given field is initialized within a constexpr constructor.
1902///
1903/// \param Dcl The constexpr constructor being checked.
1904/// \param Field The field being checked. This may be a member of an anonymous
1905/// struct or union nested within the class being checked.
1906/// \param Inits All declarations, including anonymous struct/union members and
1907/// indirect members, for which any initialization was provided.
1908/// \param Diagnosed Whether we've emitted the error message yet. Used to attach
1909/// multiple notes for different members to the same error.
1910/// \param Kind Whether we're diagnosing a constructor as written or determining
1911/// whether the formal requirements are satisfied.
1912/// \return \c false if we're checking for validity and the constructor does
1913/// not satisfy the requirements on a constexpr constructor.
1914static bool CheckConstexprCtorInitializer(Sema &SemaRef,
1915 const FunctionDecl *Dcl,
1916 FieldDecl *Field,
1917 llvm::SmallSet<Decl*, 16> &Inits,
1918 bool &Diagnosed,
1919 Sema::CheckConstexprKind Kind) {
1920 // In C++20 onwards, there's nothing to check for validity.
1921 if (Kind == Sema::CheckConstexprKind::CheckValid &&
1922 SemaRef.getLangOpts().CPlusPlus2a)
1923 return true;
1924
1925 if (Field->isInvalidDecl())
1926 return true;
1927
1928 if (Field->isUnnamedBitfield())
1929 return true;
1930
1931 // Anonymous unions with no variant members and empty anonymous structs do not
1932 // need to be explicitly initialized. FIXME: Anonymous structs that contain no
1933 // indirect fields don't need initializing.
1934 if (Field->isAnonymousStructOrUnion() &&
1935 (Field->getType()->isUnionType()
1936 ? !Field->getType()->getAsCXXRecordDecl()->hasVariantMembers()
1937 : Field->getType()->getAsCXXRecordDecl()->isEmpty()))
1938 return true;
1939
1940 if (!Inits.count(Field)) {
1941 if (Kind == Sema::CheckConstexprKind::Diagnose) {
1942 if (!Diagnosed) {
1943 SemaRef.Diag(Dcl->getLocation(),
1944 SemaRef.getLangOpts().CPlusPlus2a
1945 ? diag::warn_cxx17_compat_constexpr_ctor_missing_init
1946 : diag::ext_constexpr_ctor_missing_init);
1947 Diagnosed = true;
1948 }
1949 SemaRef.Diag(Field->getLocation(),
1950 diag::note_constexpr_ctor_missing_init);
1951 } else if (!SemaRef.getLangOpts().CPlusPlus2a) {
1952 return false;
1953 }
1954 } else if (Field->isAnonymousStructOrUnion()) {
1955 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl();
1956 for (auto *I : RD->fields())
1957 // If an anonymous union contains an anonymous struct of which any member
1958 // is initialized, all members must be initialized.
1959 if (!RD->isUnion() || Inits.count(I))
1960 if (!CheckConstexprCtorInitializer(SemaRef, Dcl, I, Inits, Diagnosed,
1961 Kind))
1962 return false;
1963 }
1964 return true;
1965}
1966
1967/// Check the provided statement is allowed in a constexpr function
1968/// definition.
1969static bool
1970CheckConstexprFunctionStmt(Sema &SemaRef, const FunctionDecl *Dcl, Stmt *S,
1971 SmallVectorImpl<SourceLocation> &ReturnStmts,
1972 SourceLocation &Cxx1yLoc, SourceLocation &Cxx2aLoc,
1973 Sema::CheckConstexprKind Kind) {
1974 // - its function-body shall be [...] a compound-statement that contains only
1975 switch (S->getStmtClass()) {
1976 case Stmt::NullStmtClass:
1977 // - null statements,
1978 return true;
1979
1980 case Stmt::DeclStmtClass:
1981 // - static_assert-declarations
1982 // - using-declarations,
1983 // - using-directives,
1984 // - typedef declarations and alias-declarations that do not define
1985 // classes or enumerations,
1986 if (!CheckConstexprDeclStmt(SemaRef, Dcl, cast<DeclStmt>(S), Cxx1yLoc, Kind))
1987 return false;
1988 return true;
1989
1990 case Stmt::ReturnStmtClass:
1991 // - and exactly one return statement;
1992 if (isa<CXXConstructorDecl>(Dcl)) {
1993 // C++1y allows return statements in constexpr constructors.
1994 if (!Cxx1yLoc.isValid())
1995 Cxx1yLoc = S->getBeginLoc();
1996 return true;
1997 }
1998
1999 ReturnStmts.push_back(S->getBeginLoc());
2000 return true;
2001
2002 case Stmt::CompoundStmtClass: {
2003 // C++1y allows compound-statements.
2004 if (!Cxx1yLoc.isValid())
2005 Cxx1yLoc = S->getBeginLoc();
2006
2007 CompoundStmt *CompStmt = cast<CompoundStmt>(S);
2008 for (auto *BodyIt : CompStmt->body()) {
2009 if (!CheckConstexprFunctionStmt(SemaRef, Dcl, BodyIt, ReturnStmts,
2010 Cxx1yLoc, Cxx2aLoc, Kind))
2011 return false;
2012 }
2013 return true;
2014 }
2015
2016 case Stmt::AttributedStmtClass:
2017 if (!Cxx1yLoc.isValid())
2018 Cxx1yLoc = S->getBeginLoc();
2019 return true;
2020
2021 case Stmt::IfStmtClass: {
2022 // C++1y allows if-statements.
2023 if (!Cxx1yLoc.isValid())
2024 Cxx1yLoc = S->getBeginLoc();
2025
2026 IfStmt *If = cast<IfStmt>(S);
2027 if (!CheckConstexprFunctionStmt(SemaRef, Dcl, If->getThen(), ReturnStmts,
2028 Cxx1yLoc, Cxx2aLoc, Kind))
2029 return false;
2030 if (If->getElse() &&
2031 !CheckConstexprFunctionStmt(SemaRef, Dcl, If->getElse(), ReturnStmts,
2032 Cxx1yLoc, Cxx2aLoc, Kind))
2033 return false;
2034 return true;
2035 }
2036
2037 case Stmt::WhileStmtClass:
2038 case Stmt::DoStmtClass:
2039 case Stmt::ForStmtClass:
2040 case Stmt::CXXForRangeStmtClass:
2041 case Stmt::ContinueStmtClass:
2042 // C++1y allows all of these. We don't allow them as extensions in C++11,
2043 // because they don't make sense without variable mutation.
2044 if (!SemaRef.getLangOpts().CPlusPlus14)
2045 break;
2046 if (!Cxx1yLoc.isValid())
2047 Cxx1yLoc = S->getBeginLoc();
2048 for (Stmt *SubStmt : S->children())
2049 if (SubStmt &&
2050 !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts,
2051 Cxx1yLoc, Cxx2aLoc, Kind))
2052 return false;
2053 return true;
2054
2055 case Stmt::SwitchStmtClass:
2056 case Stmt::CaseStmtClass:
2057 case Stmt::DefaultStmtClass:
2058 case Stmt::BreakStmtClass:
2059 // C++1y allows switch-statements, and since they don't need variable
2060 // mutation, we can reasonably allow them in C++11 as an extension.
2061 if (!Cxx1yLoc.isValid())
2062 Cxx1yLoc = S->getBeginLoc();
2063 for (Stmt *SubStmt : S->children())
2064 if (SubStmt &&
2065 !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts,
2066 Cxx1yLoc, Cxx2aLoc, Kind))
2067 return false;
2068 return true;
2069
2070 case Stmt::GCCAsmStmtClass:
2071 case Stmt::MSAsmStmtClass:
2072 // C++2a allows inline assembly statements.
2073 case Stmt::CXXTryStmtClass:
2074 if (Cxx2aLoc.isInvalid())
2075 Cxx2aLoc = S->getBeginLoc();
2076 for (Stmt *SubStmt : S->children()) {
2077 if (SubStmt &&
2078 !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts,
2079 Cxx1yLoc, Cxx2aLoc, Kind))
2080 return false;
2081 }
2082 return true;
2083
2084 case Stmt::CXXCatchStmtClass:
2085 // Do not bother checking the language mode (already covered by the
2086 // try block check).
2087 if (!CheckConstexprFunctionStmt(SemaRef, Dcl,
2088 cast<CXXCatchStmt>(S)->getHandlerBlock(),
2089 ReturnStmts, Cxx1yLoc, Cxx2aLoc, Kind))
2090 return false;
2091 return true;
2092
2093 default:
2094 if (!isa<Expr>(S))
2095 break;
2096
2097 // C++1y allows expression-statements.
2098 if (!Cxx1yLoc.isValid())
2099 Cxx1yLoc = S->getBeginLoc();
2100 return true;
2101 }
2102
2103 if (Kind == Sema::CheckConstexprKind::Diagnose) {
2104 SemaRef.Diag(S->getBeginLoc(), diag::err_constexpr_body_invalid_stmt)
2105 << isa<CXXConstructorDecl>(Dcl) << Dcl->isConsteval();
2106 }
2107 return false;
2108}
2109
2110/// Check the body for the given constexpr function declaration only contains
2111/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4.
2112///
2113/// \return true if the body is OK, false if we have found or diagnosed a
2114/// problem.
2115static bool CheckConstexprFunctionBody(Sema &SemaRef, const FunctionDecl *Dcl,
2116 Stmt *Body,
2117 Sema::CheckConstexprKind Kind) {
2118 SmallVector<SourceLocation, 4> ReturnStmts;
2119
2120 if (isa<CXXTryStmt>(Body)) {
2121 // C++11 [dcl.constexpr]p3:
2122 // The definition of a constexpr function shall satisfy the following
2123 // constraints: [...]
2124 // - its function-body shall be = delete, = default, or a
2125 // compound-statement
2126 //
2127 // C++11 [dcl.constexpr]p4:
2128 // In the definition of a constexpr constructor, [...]
2129 // - its function-body shall not be a function-try-block;
2130 //
2131 // This restriction is lifted in C++2a, as long as inner statements also
2132 // apply the general constexpr rules.
2133 switch (Kind) {
2134 case Sema::CheckConstexprKind::CheckValid:
2135 if (!SemaRef.getLangOpts().CPlusPlus2a)
2136 return false;
2137 break;
2138
2139 case Sema::CheckConstexprKind::Diagnose:
2140 SemaRef.Diag(Body->getBeginLoc(),
2141 !SemaRef.getLangOpts().CPlusPlus2a
2142 ? diag::ext_constexpr_function_try_block_cxx2a
2143 : diag::warn_cxx17_compat_constexpr_function_try_block)
2144 << isa<CXXConstructorDecl>(Dcl);
2145 break;
2146 }
2147 }
2148
2149 // - its function-body shall be [...] a compound-statement that contains only
2150 // [... list of cases ...]
2151 //
2152 // Note that walking the children here is enough to properly check for
2153 // CompoundStmt and CXXTryStmt body.
2154 SourceLocation Cxx1yLoc, Cxx2aLoc;
2155 for (Stmt *SubStmt : Body->children()) {
2156 if (SubStmt &&
2157 !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts,
2158 Cxx1yLoc, Cxx2aLoc, Kind))
2159 return false;
2160 }
2161
2162 if (Kind == Sema::CheckConstexprKind::CheckValid) {
2163 // If this is only valid as an extension, report that we don't satisfy the
2164 // constraints of the current language.
2165 if ((Cxx2aLoc.isValid() && !SemaRef.getLangOpts().CPlusPlus2a) ||
2166 (Cxx1yLoc.isValid() && !SemaRef.getLangOpts().CPlusPlus17))
2167 return false;
2168 } else if (Cxx2aLoc.isValid()) {
2169 SemaRef.Diag(Cxx2aLoc,
2170 SemaRef.getLangOpts().CPlusPlus2a
2171 ? diag::warn_cxx17_compat_constexpr_body_invalid_stmt
2172 : diag::ext_constexpr_body_invalid_stmt_cxx2a)
2173 << isa<CXXConstructorDecl>(Dcl);
2174 } else if (Cxx1yLoc.isValid()) {
2175 SemaRef.Diag(Cxx1yLoc,
2176 SemaRef.getLangOpts().CPlusPlus14
2177 ? diag::warn_cxx11_compat_constexpr_body_invalid_stmt
2178 : diag::ext_constexpr_body_invalid_stmt)
2179 << isa<CXXConstructorDecl>(Dcl);
2180 }
2181
2182 if (const CXXConstructorDecl *Constructor
2183 = dyn_cast<CXXConstructorDecl>(Dcl)) {
2184 const CXXRecordDecl *RD = Constructor->getParent();
2185 // DR1359:
2186 // - every non-variant non-static data member and base class sub-object
2187 // shall be initialized;
2188 // DR1460:
2189 // - if the class is a union having variant members, exactly one of them
2190 // shall be initialized;
2191 if (RD->isUnion()) {
2192 if (Constructor->getNumCtorInitializers() == 0 &&
2193 RD->hasVariantMembers()) {
2194 if (Kind == Sema::CheckConstexprKind::Diagnose) {
2195 SemaRef.Diag(
2196 Dcl->getLocation(),
2197 SemaRef.getLangOpts().CPlusPlus2a
2198 ? diag::warn_cxx17_compat_constexpr_union_ctor_no_init
2199 : diag::ext_constexpr_union_ctor_no_init);
2200 } else if (!SemaRef.getLangOpts().CPlusPlus2a) {
2201 return false;
2202 }
2203 }
2204 } else if (!Constructor->isDependentContext() &&
2205 !Constructor->isDelegatingConstructor()) {
2206 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\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 2206, __PRETTY_FUNCTION__))
;
2207
2208 // Skip detailed checking if we have enough initializers, and we would
2209 // allow at most one initializer per member.
2210 bool AnyAnonStructUnionMembers = false;
2211 unsigned Fields = 0;
2212 for (CXXRecordDecl::field_iterator I = RD->field_begin(),
2213 E = RD->field_end(); I != E; ++I, ++Fields) {
2214 if (I->isAnonymousStructOrUnion()) {
2215 AnyAnonStructUnionMembers = true;
2216 break;
2217 }
2218 }
2219 // DR1460:
2220 // - if the class is a union-like class, but is not a union, for each of
2221 // its anonymous union members having variant members, exactly one of
2222 // them shall be initialized;
2223 if (AnyAnonStructUnionMembers ||
2224 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) {
2225 // Check initialization of non-static data members. Base classes are
2226 // always initialized so do not need to be checked. Dependent bases
2227 // might not have initializers in the member initializer list.
2228 llvm::SmallSet<Decl*, 16> Inits;
2229 for (const auto *I: Constructor->inits()) {
2230 if (FieldDecl *FD = I->getMember())
2231 Inits.insert(FD);
2232 else if (IndirectFieldDecl *ID = I->getIndirectMember())
2233 Inits.insert(ID->chain_begin(), ID->chain_end());
2234 }
2235
2236 bool Diagnosed = false;
2237 for (auto *I : RD->fields())
2238 if (!CheckConstexprCtorInitializer(SemaRef, Dcl, I, Inits, Diagnosed,
2239 Kind))
2240 return false;
2241 }
2242 }
2243 } else {
2244 if (ReturnStmts.empty()) {
2245 // C++1y doesn't require constexpr functions to contain a 'return'
2246 // statement. We still do, unless the return type might be void, because
2247 // otherwise if there's no return statement, the function cannot
2248 // be used in a core constant expression.
2249 bool OK = SemaRef.getLangOpts().CPlusPlus14 &&
2250 (Dcl->getReturnType()->isVoidType() ||
2251 Dcl->getReturnType()->isDependentType());
2252 switch (Kind) {
2253 case Sema::CheckConstexprKind::Diagnose:
2254 SemaRef.Diag(Dcl->getLocation(),
2255 OK ? diag::warn_cxx11_compat_constexpr_body_no_return
2256 : diag::err_constexpr_body_no_return)
2257 << Dcl->isConsteval();
2258 if (!OK)
2259 return false;
2260 break;
2261
2262 case Sema::CheckConstexprKind::CheckValid:
2263 // The formal requirements don't include this rule in C++14, even
2264 // though the "must be able to produce a constant expression" rules
2265 // still imply it in some cases.
2266 if (!SemaRef.getLangOpts().CPlusPlus14)
2267 return false;
2268 break;
2269 }
2270 } else if (ReturnStmts.size() > 1) {
2271 switch (Kind) {
2272 case Sema::CheckConstexprKind::Diagnose:
2273 SemaRef.Diag(
2274 ReturnStmts.back(),
2275 SemaRef.getLangOpts().CPlusPlus14
2276 ? diag::warn_cxx11_compat_constexpr_body_multiple_return
2277 : diag::ext_constexpr_body_multiple_return);
2278 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I)
2279 SemaRef.Diag(ReturnStmts[I],
2280 diag::note_constexpr_body_previous_return);
2281 break;
2282
2283 case Sema::CheckConstexprKind::CheckValid:
2284 if (!SemaRef.getLangOpts().CPlusPlus14)
2285 return false;
2286 break;
2287 }
2288 }
2289 }
2290
2291 // C++11 [dcl.constexpr]p5:
2292 // if no function argument values exist such that the function invocation
2293 // substitution would produce a constant expression, the program is
2294 // ill-formed; no diagnostic required.
2295 // C++11 [dcl.constexpr]p3:
2296 // - every constructor call and implicit conversion used in initializing the
2297 // return value shall be one of those allowed in a constant expression.
2298 // C++11 [dcl.constexpr]p4:
2299 // - every constructor involved in initializing non-static data members and
2300 // base class sub-objects shall be a constexpr constructor.
2301 //
2302 // Note that this rule is distinct from the "requirements for a constexpr
2303 // function", so is not checked in CheckValid mode.
2304 SmallVector<PartialDiagnosticAt, 8> Diags;
2305 if (Kind == Sema::CheckConstexprKind::Diagnose &&
2306 !Expr::isPotentialConstantExpr(Dcl, Diags)) {
2307 SemaRef.Diag(Dcl->getLocation(),
2308 diag::ext_constexpr_function_never_constant_expr)
2309 << isa<CXXConstructorDecl>(Dcl);
2310 for (size_t I = 0, N = Diags.size(); I != N; ++I)
2311 SemaRef.Diag(Diags[I].first, Diags[I].second);
2312 // Don't return false here: we allow this for compatibility in
2313 // system headers.
2314 }
2315
2316 return true;
2317}
2318
2319/// Get the class that is directly named by the current context. This is the
2320/// class for which an unqualified-id in this scope could name a constructor
2321/// or destructor.
2322///
2323/// If the scope specifier denotes a class, this will be that class.
2324/// If the scope specifier is empty, this will be the class whose
2325/// member-specification we are currently within. Otherwise, there
2326/// is no such class.
2327CXXRecordDecl *Sema::getCurrentClass(Scope *, const CXXScopeSpec *SS) {
2328 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!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 2328, __PRETTY_FUNCTION__))
;
2329
2330 if (SS && SS->isInvalid())
2331 return nullptr;
2332
2333 if (SS && SS->isNotEmpty()) {
2334 DeclContext *DC = computeDeclContext(*SS, true);
2335 return dyn_cast_or_null<CXXRecordDecl>(DC);
2336 }
2337
2338 return dyn_cast_or_null<CXXRecordDecl>(CurContext);
2339}
2340
2341/// isCurrentClassName - Determine whether the identifier II is the
2342/// name of the class type currently being defined. In the case of
2343/// nested classes, this will only return true if II is the name of
2344/// the innermost class.
2345bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *S,
2346 const CXXScopeSpec *SS) {
2347 CXXRecordDecl *CurDecl = getCurrentClass(S, SS);
2348 return CurDecl && &II == CurDecl->getIdentifier();
2349}
2350
2351/// Determine whether the identifier II is a typo for the name of
2352/// the class type currently being defined. If so, update it to the identifier
2353/// that should have been used.
2354bool Sema::isCurrentClassNameTypo(IdentifierInfo *&II, const CXXScopeSpec *SS) {
2355 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!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 2355, __PRETTY_FUNCTION__))
;
2356
2357 if (!getLangOpts().SpellChecking)
2358 return false;
2359
2360 CXXRecordDecl *CurDecl;
2361 if (SS && SS->isSet() && !SS->isInvalid()) {
2362 DeclContext *DC = computeDeclContext(*SS, true);
2363 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC);
2364 } else
2365 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext);
2366
2367 if (CurDecl && CurDecl->getIdentifier() && II != CurDecl->getIdentifier() &&
2368 3 * II->getName().edit_distance(CurDecl->getIdentifier()->getName())
2369 < II->getLength()) {
2370 II = CurDecl->getIdentifier();
2371 return true;
2372 }
2373
2374 return false;
2375}
2376
2377/// Determine whether the given class is a base class of the given
2378/// class, including looking at dependent bases.
2379static bool findCircularInheritance(const CXXRecordDecl *Class,
2380 const CXXRecordDecl *Current) {
2381 SmallVector<const CXXRecordDecl*, 8> Queue;
2382
2383 Class = Class->getCanonicalDecl();
2384 while (true) {
2385 for (const auto &I : Current->bases()) {
2386 CXXRecordDecl *Base = I.getType()->getAsCXXRecordDecl();
2387 if (!Base)
2388 continue;
2389
2390 Base = Base->getDefinition();
2391 if (!Base)
2392 continue;
2393
2394 if (Base->getCanonicalDecl() == Class)
2395 return true;
2396
2397 Queue.push_back(Base);
2398 }
2399
2400 if (Queue.empty())
2401 return false;
2402
2403 Current = Queue.pop_back_val();
2404 }
2405
2406 return false;
2407}
2408
2409/// Check the validity of a C++ base class specifier.
2410///
2411/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics
2412/// and returns NULL otherwise.
2413CXXBaseSpecifier *
2414Sema::CheckBaseSpecifier(CXXRecordDecl *Class,
2415 SourceRange SpecifierRange,
2416 bool Virtual, AccessSpecifier Access,
2417 TypeSourceInfo *TInfo,
2418 SourceLocation EllipsisLoc) {
2419 QualType BaseType = TInfo->getType();
2420
2421 // C++ [class.union]p1:
2422 // A union shall not have base classes.
2423 if (Class->isUnion()) {
2424 Diag(Class->getLocation(), diag::err_base_clause_on_union)
2425 << SpecifierRange;
2426 return nullptr;
2427 }
2428
2429 if (EllipsisLoc.isValid() &&
2430 !TInfo->getType()->containsUnexpandedParameterPack()) {
2431 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs)
2432 << TInfo->getTypeLoc().getSourceRange();
2433 EllipsisLoc = SourceLocation();
2434 }
2435
2436 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc();
2437
2438 if (BaseType->isDependentType()) {
2439 // Make sure that we don't have circular inheritance among our dependent
2440 // bases. For non-dependent bases, the check for completeness below handles
2441 // this.
2442 if (CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl()) {
2443 if (BaseDecl->getCanonicalDecl() == Class->getCanonicalDecl() ||
2444 ((BaseDecl = BaseDecl->getDefinition()) &&
2445 findCircularInheritance(Class, BaseDecl))) {
2446 Diag(BaseLoc, diag::err_circular_inheritance)
2447 << BaseType << Context.getTypeDeclType(Class);
2448
2449 if (BaseDecl->getCanonicalDecl() != Class->getCanonicalDecl())
2450 Diag(BaseDecl->getLocation(), diag::note_previous_decl)
2451 << BaseType;
2452
2453 return nullptr;
2454 }
2455 }
2456
2457 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual,
2458 Class->getTagKind() == TTK_Class,
2459 Access, TInfo, EllipsisLoc);
2460 }
2461
2462 // Base specifiers must be record types.
2463 if (!BaseType->isRecordType()) {
2464 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange;
2465 return nullptr;
2466 }
2467
2468 // C++ [class.union]p1:
2469 // A union shall not be used as a base class.
2470 if (BaseType->isUnionType()) {
2471 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange;
2472 return nullptr;
2473 }
2474
2475 // For the MS ABI, propagate DLL attributes to base class templates.
2476 if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
2477 if (Attr *ClassAttr = getDLLAttr(Class)) {
2478 if (auto *BaseTemplate = dyn_cast_or_null<ClassTemplateSpecializationDecl>(
2479 BaseType->getAsCXXRecordDecl())) {
2480 propagateDLLAttrToBaseClassTemplate(Class, ClassAttr, BaseTemplate,
2481 BaseLoc);
2482 }
2483 }
2484 }
2485
2486 // C++ [class.derived]p2:
2487 // The class-name in a base-specifier shall not be an incompletely
2488 // defined class.
2489 if (RequireCompleteType(BaseLoc, BaseType,
2490 diag::err_incomplete_base_class, SpecifierRange)) {
2491 Class->setInvalidDecl();
2492 return nullptr;
2493 }
2494
2495 // If the base class is polymorphic or isn't empty, the new one is/isn't, too.
2496 RecordDecl *BaseDecl = BaseType->castAs<RecordType>()->getDecl();
2497 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\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 2497, __PRETTY_FUNCTION__))
;
2498 BaseDecl = BaseDecl->getDefinition();
2499 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\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 2499, __PRETTY_FUNCTION__))
;
2500 CXXRecordDecl *CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl);
2501 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\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 2501, __PRETTY_FUNCTION__))
;
2502
2503 // Microsoft docs say:
2504 // "If a base-class has a code_seg attribute, derived classes must have the
2505 // same attribute."
2506 const auto *BaseCSA = CXXBaseDecl->getAttr<CodeSegAttr>();
2507 const auto *DerivedCSA = Class->getAttr<CodeSegAttr>();
2508 if ((DerivedCSA || BaseCSA) &&
2509 (!BaseCSA || !DerivedCSA || BaseCSA->getName() != DerivedCSA->getName())) {
2510 Diag(Class->getLocation(), diag::err_mismatched_code_seg_base);
2511 Diag(CXXBaseDecl->getLocation(), diag::note_base_class_specified_here)
2512 << CXXBaseDecl;
2513 return nullptr;
2514 }
2515
2516 // A class which contains a flexible array member is not suitable for use as a
2517 // base class:
2518 // - If the layout determines that a base comes before another base,
2519 // the flexible array member would index into the subsequent base.
2520 // - If the layout determines that base comes before the derived class,
2521 // the flexible array member would index into the derived class.
2522 if (CXXBaseDecl->hasFlexibleArrayMember()) {
2523 Diag(BaseLoc, diag::err_base_class_has_flexible_array_member)
2524 << CXXBaseDecl->getDeclName();
2525 return nullptr;
2526 }
2527
2528 // C++ [class]p3:
2529 // If a class is marked final and it appears as a base-type-specifier in
2530 // base-clause, the program is ill-formed.
2531 if (FinalAttr *FA = CXXBaseDecl->getAttr<FinalAttr>()) {
2532 Diag(BaseLoc, diag::err_class_marked_final_used_as_base)
2533 << CXXBaseDecl->getDeclName()
2534 << FA->isSpelledAsSealed();
2535 Diag(CXXBaseDecl->getLocation(), diag::note_entity_declared_at)
2536 << CXXBaseDecl->getDeclName() << FA->getRange();
2537 return nullptr;
2538 }
2539
2540 if (BaseDecl->isInvalidDecl())
2541 Class->setInvalidDecl();
2542
2543 // Create the base specifier.
2544 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual,
2545 Class->getTagKind() == TTK_Class,
2546 Access, TInfo, EllipsisLoc);
2547}
2548
2549/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is
2550/// one entry in the base class list of a class specifier, for
2551/// example:
2552/// class foo : public bar, virtual private baz {
2553/// 'public bar' and 'virtual private baz' are each base-specifiers.
2554BaseResult
2555Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange,
2556 ParsedAttributes &Attributes,
2557 bool Virtual, AccessSpecifier Access,
2558 ParsedType basetype, SourceLocation BaseLoc,
2559 SourceLocation EllipsisLoc) {
2560 if (!classdecl)
2561 return true;
2562
2563 AdjustDeclIfTemplate(classdecl);
2564 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl);
2565 if (!Class)
2566 return true;
2567
2568 // We haven't yet attached the base specifiers.
2569 Class->setIsParsingBaseSpecifiers();
2570
2571 // We do not support any C++11 attributes on base-specifiers yet.
2572 // Diagnose any attributes we see.
2573 for (const ParsedAttr &AL : Attributes) {
2574 if (AL.isInvalid() || AL.getKind() == ParsedAttr::IgnoredAttribute)
2575 continue;
2576 Diag(AL.getLoc(), AL.getKind() == ParsedAttr::UnknownAttribute
2577 ? (unsigned)diag::warn_unknown_attribute_ignored
2578 : (unsigned)diag::err_base_specifier_attribute)
2579 << AL;
2580 }
2581
2582 TypeSourceInfo *TInfo = nullptr;
2583 GetTypeFromParser(basetype, &TInfo);
2584
2585 if (EllipsisLoc.isInvalid() &&
2586 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo,
2587 UPPC_BaseType))
2588 return true;
2589
2590 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange,
2591 Virtual, Access, TInfo,
2592 EllipsisLoc))
2593 return BaseSpec;
2594 else
2595 Class->setInvalidDecl();
2596
2597 return true;
2598}
2599
2600/// Use small set to collect indirect bases. As this is only used
2601/// locally, there's no need to abstract the small size parameter.
2602typedef llvm::SmallPtrSet<QualType, 4> IndirectBaseSet;
2603
2604/// Recursively add the bases of Type. Don't add Type itself.
2605static void
2606NoteIndirectBases(ASTContext &Context, IndirectBaseSet &Set,
2607 const QualType &Type)
2608{
2609 // Even though the incoming type is a base, it might not be
2610 // a class -- it could be a template parm, for instance.
2611 if (auto Rec = Type->getAs<RecordType>()) {
2612 auto Decl = Rec->getAsCXXRecordDecl();
2613
2614 // Iterate over its bases.
2615 for (const auto &BaseSpec : Decl->bases()) {
2616 QualType Base = Context.getCanonicalType(BaseSpec.getType())
2617 .getUnqualifiedType();
2618 if (Set.insert(Base).second)
2619 // If we've not already seen it, recurse.
2620 NoteIndirectBases(Context, Set, Base);
2621 }
2622 }
2623}
2624
2625/// Performs the actual work of attaching the given base class
2626/// specifiers to a C++ class.
2627bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class,
2628 MutableArrayRef<CXXBaseSpecifier *> Bases) {
2629 if (Bases.empty())
2630 return false;
2631
2632 // Used to keep track of which base types we have already seen, so
2633 // that we can properly diagnose redundant direct base types. Note
2634 // that the key is always the unqualified canonical type of the base
2635 // class.
2636 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes;
2637
2638 // Used to track indirect bases so we can see if a direct base is
2639 // ambiguous.
2640 IndirectBaseSet IndirectBaseTypes;
2641
2642 // Copy non-redundant base specifiers into permanent storage.
2643 unsigned NumGoodBases = 0;
2644 bool Invalid = false;
2645 for (unsigned idx = 0; idx < Bases.size(); ++idx) {
2646 QualType NewBaseType
2647 = Context.getCanonicalType(Bases[idx]->getType());
2648 NewBaseType = NewBaseType.getLocalUnqualifiedType();
2649
2650 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType];
2651 if (KnownBase) {
2652 // C++ [class.mi]p3:
2653 // A class shall not be specified as a direct base class of a
2654 // derived class more than once.
2655 Diag(Bases[idx]->getBeginLoc(), diag::err_duplicate_base_class)
2656 << KnownBase->getType() << Bases[idx]->getSourceRange();
2657
2658 // Delete the duplicate base class specifier; we're going to
2659 // overwrite its pointer later.
2660 Context.Deallocate(Bases[idx]);
2661
2662 Invalid = true;
2663 } else {
2664 // Okay, add this new base class.
2665 KnownBase = Bases[idx];
2666 Bases[NumGoodBases++] = Bases[idx];
2667
2668 // Note this base's direct & indirect bases, if there could be ambiguity.
2669 if (Bases.size() > 1)
2670 NoteIndirectBases(Context, IndirectBaseTypes, NewBaseType);
2671
2672 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) {
2673 const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl());
2674 if (Class->isInterface() &&
2675 (!RD->isInterfaceLike() ||
2676 KnownBase->getAccessSpecifier() != AS_public)) {
2677 // The Microsoft extension __interface does not permit bases that
2678 // are not themselves public interfaces.
2679 Diag(KnownBase->getBeginLoc(), diag::err_invalid_base_in_interface)
2680 << getRecordDiagFromTagKind(RD->getTagKind()) << RD
2681 << RD->getSourceRange();
2682 Invalid = true;
2683 }
2684 if (RD->hasAttr<WeakAttr>())
2685 Class->addAttr(WeakAttr::CreateImplicit(Context));
2686 }
2687 }
2688 }
2689
2690 // Attach the remaining base class specifiers to the derived class.
2691 Class->setBases(Bases.data(), NumGoodBases);
2692
2693 // Check that the only base classes that are duplicate are virtual.
2694 for (unsigned idx = 0; idx < NumGoodBases; ++idx) {
2695 // Check whether this direct base is inaccessible due to ambiguity.
2696 QualType BaseType = Bases[idx]->getType();
2697
2698 // Skip all dependent types in templates being used as base specifiers.
2699 // Checks below assume that the base specifier is a CXXRecord.
2700 if (BaseType->isDependentType())
2701 continue;
2702
2703 CanQualType CanonicalBase = Context.getCanonicalType(BaseType)
2704 .getUnqualifiedType();
2705
2706 if (IndirectBaseTypes.count(CanonicalBase)) {
2707 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
2708 /*DetectVirtual=*/true);
2709 bool found
2710 = Class->isDerivedFrom(CanonicalBase->getAsCXXRecordDecl(), Paths);
2711 assert(found)((found) ? static_cast<void> (0) : __assert_fail ("found"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 2711, __PRETTY_FUNCTION__))
;
2712 (void)found;
2713
2714 if (Paths.isAmbiguous(CanonicalBase))
2715 Diag(Bases[idx]->getBeginLoc(), diag::warn_inaccessible_base_class)
2716 << BaseType << getAmbiguousPathsDisplayString(Paths)
2717 << Bases[idx]->getSourceRange();
2718 else
2719 assert(Bases[idx]->isVirtual())((Bases[idx]->isVirtual()) ? static_cast<void> (0) :
__assert_fail ("Bases[idx]->isVirtual()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 2719, __PRETTY_FUNCTION__))
;
2720 }
2721
2722 // Delete the base class specifier, since its data has been copied
2723 // into the CXXRecordDecl.
2724 Context.Deallocate(Bases[idx]);
2725 }
2726
2727 return Invalid;
2728}
2729
2730/// ActOnBaseSpecifiers - Attach the given base specifiers to the
2731/// class, after checking whether there are any duplicate base
2732/// classes.
2733void Sema::ActOnBaseSpecifiers(Decl *ClassDecl,
2734 MutableArrayRef<CXXBaseSpecifier *> Bases) {
2735 if (!ClassDecl || Bases.empty())
2736 return;
2737
2738 AdjustDeclIfTemplate(ClassDecl);
2739 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), Bases);
2740}
2741
2742/// Determine whether the type \p Derived is a C++ class that is
2743/// derived from the type \p Base.
2744bool Sema::IsDerivedFrom(SourceLocation Loc, QualType Derived, QualType Base) {
2745 if (!getLangOpts().CPlusPlus)
2746 return false;
2747
2748 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl();
2749 if (!DerivedRD)
2750 return false;
2751
2752 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl();
2753 if (!BaseRD)
2754 return false;
2755
2756 // If either the base or the derived type is invalid, don't try to
2757 // check whether one is derived from the other.
2758 if (BaseRD->isInvalidDecl() || DerivedRD->isInvalidDecl())
2759 return false;
2760
2761 // FIXME: In a modules build, do we need the entire path to be visible for us
2762 // to be able to use the inheritance relationship?
2763 if (!isCompleteType(Loc, Derived) && !DerivedRD->isBeingDefined())
2764 return false;
2765
2766 return DerivedRD->isDerivedFrom(BaseRD);
2767}
2768
2769/// Determine whether the type \p Derived is a C++ class that is
2770/// derived from the type \p Base.
2771bool Sema::IsDerivedFrom(SourceLocation Loc, QualType Derived, QualType Base,
2772 CXXBasePaths &Paths) {
2773 if (!getLangOpts().CPlusPlus)
2774 return false;
2775
2776 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl();
2777 if (!DerivedRD)
2778 return false;
2779
2780 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl();
2781 if (!BaseRD)
2782 return false;
2783
2784 if (!isCompleteType(Loc, Derived) && !DerivedRD->isBeingDefined())
2785 return false;
2786
2787 return DerivedRD->isDerivedFrom(BaseRD, Paths);
2788}
2789
2790static void BuildBasePathArray(const CXXBasePath &Path,
2791 CXXCastPath &BasePathArray) {
2792 // We first go backward and check if we have a virtual base.
2793 // FIXME: It would be better if CXXBasePath had the base specifier for
2794 // the nearest virtual base.
2795 unsigned Start = 0;
2796 for (unsigned I = Path.size(); I != 0; --I) {
2797 if (Path[I - 1].Base->isVirtual()) {
2798 Start = I - 1;
2799 break;
2800 }
2801 }
2802
2803 // Now add all bases.
2804 for (unsigned I = Start, E = Path.size(); I != E; ++I)
2805 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base));
2806}
2807
2808
2809void Sema::BuildBasePathArray(const CXXBasePaths &Paths,
2810 CXXCastPath &BasePathArray) {
2811 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!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 2811, __PRETTY_FUNCTION__))
;
2812 assert(Paths.isRecordingPaths() && "Must record paths!")((Paths.isRecordingPaths() && "Must record paths!") ?
static_cast<void> (0) : __assert_fail ("Paths.isRecordingPaths() && \"Must record paths!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 2812, __PRETTY_FUNCTION__))
;
2813 return ::BuildBasePathArray(Paths.front(), BasePathArray);
2814}
2815/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base
2816/// conversion (where Derived and Base are class types) is
2817/// well-formed, meaning that the conversion is unambiguous (and
2818/// that all of the base classes are accessible). Returns true
2819/// and emits a diagnostic if the code is ill-formed, returns false
2820/// otherwise. Loc is the location where this routine should point to
2821/// if there is an error, and Range is the source range to highlight
2822/// if there is an error.
2823///
2824/// If either InaccessibleBaseID or AmbigiousBaseConvID are 0, then the
2825/// diagnostic for the respective type of error will be suppressed, but the
2826/// check for ill-formed code will still be performed.
2827bool
2828Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base,
2829 unsigned InaccessibleBaseID,
2830 unsigned AmbigiousBaseConvID,
2831 SourceLocation Loc, SourceRange Range,
2832 DeclarationName Name,
2833 CXXCastPath *BasePath,
2834 bool IgnoreAccess) {
2835 // First, determine whether the path from Derived to Base is
2836 // ambiguous. This is slightly more expensive than checking whether
2837 // the Derived to Base conversion exists, because here we need to
2838 // explore multiple paths to determine if there is an ambiguity.
2839 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
2840 /*DetectVirtual=*/false);
2841 bool DerivationOkay = IsDerivedFrom(Loc, Derived, Base, Paths);
2842 if (!DerivationOkay)
2843 return true;
2844
2845 const CXXBasePath *Path = nullptr;
2846 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType()))
2847 Path = &Paths.front();
2848
2849 // For MSVC compatibility, check if Derived directly inherits from Base. Clang
2850 // warns about this hierarchy under -Winaccessible-base, but MSVC allows the
2851 // user to access such bases.
2852 if (!Path && getLangOpts().MSVCCompat) {
2853 for (const CXXBasePath &PossiblePath : Paths) {
2854 if (PossiblePath.size() == 1) {
2855 Path = &PossiblePath;
2856 if (AmbigiousBaseConvID)
2857 Diag(Loc, diag::ext_ms_ambiguous_direct_base)
2858 << Base << Derived << Range;
2859 break;
2860 }
2861 }
2862 }
2863
2864 if (Path) {
2865 if (!IgnoreAccess) {
2866 // Check that the base class can be accessed.
2867 switch (
2868 CheckBaseClassAccess(Loc, Base, Derived, *Path, InaccessibleBaseID)) {
2869 case AR_inaccessible:
2870 return true;
2871 case AR_accessible:
2872 case AR_dependent:
2873 case AR_delayed:
2874 break;
2875 }
2876 }
2877
2878 // Build a base path if necessary.
2879 if (BasePath)
2880 ::BuildBasePathArray(*Path, *BasePath);
2881 return false;
2882 }
2883
2884 if (AmbigiousBaseConvID) {
2885 // We know that the derived-to-base conversion is ambiguous, and
2886 // we're going to produce a diagnostic. Perform the derived-to-base
2887 // search just one more time to compute all of the possible paths so
2888 // that we can print them out. This is more expensive than any of
2889 // the previous derived-to-base checks we've done, but at this point
2890 // performance isn't as much of an issue.
2891 Paths.clear();
2892 Paths.setRecordingPaths(true);
2893 bool StillOkay = IsDerivedFrom(Loc, Derived, Base, Paths);
2894 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\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 2894, __PRETTY_FUNCTION__))
;
2895 (void)StillOkay;
2896
2897 // Build up a textual representation of the ambiguous paths, e.g.,
2898 // D -> B -> A, that will be used to illustrate the ambiguous
2899 // conversions in the diagnostic. We only print one of the paths
2900 // to each base class subobject.
2901 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths);
2902
2903 Diag(Loc, AmbigiousBaseConvID)
2904 << Derived << Base << PathDisplayStr << Range << Name;
2905 }
2906 return true;
2907}
2908
2909bool
2910Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base,
2911 SourceLocation Loc, SourceRange Range,
2912 CXXCastPath *BasePath,
2913 bool IgnoreAccess) {
2914 return CheckDerivedToBaseConversion(
2915 Derived, Base, diag::err_upcast_to_inaccessible_base,
2916 diag::err_ambiguous_derived_to_base_conv, Loc, Range, DeclarationName(),
2917 BasePath, IgnoreAccess);
2918}
2919
2920
2921/// Builds a string representing ambiguous paths from a
2922/// specific derived class to different subobjects of the same base
2923/// class.
2924///
2925/// This function builds a string that can be used in error messages
2926/// to show the different paths that one can take through the
2927/// inheritance hierarchy to go from the derived class to different
2928/// subobjects of a base class. The result looks something like this:
2929/// @code
2930/// struct D -> struct B -> struct A
2931/// struct D -> struct C -> struct A
2932/// @endcode
2933std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) {
2934 std::string PathDisplayStr;
2935 std::set<unsigned> DisplayedPaths;
2936 for (CXXBasePaths::paths_iterator Path = Paths.begin();
2937 Path != Paths.end(); ++Path) {
2938 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) {
2939 // We haven't displayed a path to this particular base
2940 // class subobject yet.
2941 PathDisplayStr += "\n ";
2942 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString();
2943 for (CXXBasePath::const_iterator Element = Path->begin();
2944 Element != Path->end(); ++Element)
2945 PathDisplayStr += " -> " + Element->Base->getType().getAsString();
2946 }
2947 }
2948
2949 return PathDisplayStr;
2950}
2951
2952//===----------------------------------------------------------------------===//
2953// C++ class member Handling
2954//===----------------------------------------------------------------------===//
2955
2956/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon.
2957bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, SourceLocation ASLoc,
2958 SourceLocation ColonLoc,
2959 const ParsedAttributesView &Attrs) {
2960 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!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 2960, __PRETTY_FUNCTION__))
;
2961 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext,
2962 ASLoc, ColonLoc);
2963 CurContext->addHiddenDecl(ASDecl);
2964 return ProcessAccessDeclAttributeList(ASDecl, Attrs);
2965}
2966
2967/// CheckOverrideControl - Check C++11 override control semantics.
2968void Sema::CheckOverrideControl(NamedDecl *D) {
2969 if (D->isInvalidDecl())
2970 return;
2971
2972 // We only care about "override" and "final" declarations.
2973 if (!D->hasAttr<OverrideAttr>() && !D->hasAttr<FinalAttr>())
2974 return;
2975
2976 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D);
2977
2978 // We can't check dependent instance methods.
2979 if (MD && MD->isInstance() &&
2980 (MD->getParent()->hasAnyDependentBases() ||
2981 MD->getType()->isDependentType()))
2982 return;
2983
2984 if (MD && !MD->isVirtual()) {
2985 // If we have a non-virtual method, check if if hides a virtual method.
2986 // (In that case, it's most likely the method has the wrong type.)
2987 SmallVector<CXXMethodDecl *, 8> OverloadedMethods;
2988 FindHiddenVirtualMethods(MD, OverloadedMethods);
2989
2990 if (!OverloadedMethods.empty()) {
2991 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) {
2992 Diag(OA->getLocation(),
2993 diag::override_keyword_hides_virtual_member_function)
2994 << "override" << (OverloadedMethods.size() > 1);
2995 } else if (FinalAttr *FA = D->getAttr<FinalAttr>()) {
2996 Diag(FA->getLocation(),
2997 diag::override_keyword_hides_virtual_member_function)
2998 << (FA->isSpelledAsSealed() ? "sealed" : "final")
2999 << (OverloadedMethods.size() > 1);
3000 }
3001 NoteHiddenVirtualMethods(MD, OverloadedMethods);
3002 MD->setInvalidDecl();
3003 return;
3004 }
3005 // Fall through into the general case diagnostic.
3006 // FIXME: We might want to attempt typo correction here.
3007 }
3008
3009 if (!MD || !MD->isVirtual()) {
3010 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) {
3011 Diag(OA->getLocation(),
3012 diag::override_keyword_only_allowed_on_virtual_member_functions)
3013 << "override" << FixItHint::CreateRemoval(OA->getLocation());
3014 D->dropAttr<OverrideAttr>();
3015 }
3016 if (FinalAttr *FA = D->getAttr<FinalAttr>()) {
3017 Diag(FA->getLocation(),
3018 diag::override_keyword_only_allowed_on_virtual_member_functions)
3019 << (FA->isSpelledAsSealed() ? "sealed" : "final")
3020 << FixItHint::CreateRemoval(FA->getLocation());
3021 D->dropAttr<FinalAttr>();
3022 }
3023 return;
3024 }
3025
3026 // C++11 [class.virtual]p5:
3027 // If a function is marked with the virt-specifier override and
3028 // does not override a member function of a base class, the program is
3029 // ill-formed.
3030 bool HasOverriddenMethods = MD->size_overridden_methods() != 0;
3031 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods)
3032 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding)
3033 << MD->getDeclName();
3034}
3035
3036void Sema::DiagnoseAbsenceOfOverrideControl(NamedDecl *D) {
3037 if (D->isInvalidDecl() || D->hasAttr<OverrideAttr>())
3038 return;
3039 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D);
3040 if (!MD || MD->isImplicit() || MD->hasAttr<FinalAttr>())
3041 return;
3042
3043 SourceLocation Loc = MD->getLocation();
3044 SourceLocation SpellingLoc = Loc;
3045 if (getSourceManager().isMacroArgExpansion(Loc))
3046 SpellingLoc = getSourceManager().getImmediateExpansionRange(Loc).getBegin();
3047 SpellingLoc = getSourceManager().getSpellingLoc(SpellingLoc);
3048 if (SpellingLoc.isValid() && getSourceManager().isInSystemHeader(SpellingLoc))
3049 return;
3050
3051 if (MD->size_overridden_methods() > 0) {
3052 unsigned DiagID = isa<CXXDestructorDecl>(MD)
3053 ? diag::warn_destructor_marked_not_override_overriding
3054 : diag::warn_function_marked_not_override_overriding;
3055 Diag(MD->getLocation(), DiagID) << MD->getDeclName();
3056 const CXXMethodDecl *OMD = *MD->begin_overridden_methods();
3057 Diag(OMD->getLocation(), diag::note_overridden_virtual_function);
3058 }
3059}
3060
3061/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member
3062/// function overrides a virtual member function marked 'final', according to
3063/// C++11 [class.virtual]p4.
3064bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New,
3065 const CXXMethodDecl *Old) {
3066 FinalAttr *FA = Old->getAttr<FinalAttr>();
3067 if (!FA)
3068 return false;
3069
3070 Diag(New->getLocation(), diag::err_final_function_overridden)
3071 << New->getDeclName()
3072 << FA->isSpelledAsSealed();
3073 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
3074 return true;
3075}
3076
3077static bool InitializationHasSideEffects(const FieldDecl &FD) {
3078 const Type *T = FD.getType()->getBaseElementTypeUnsafe();
3079 // FIXME: Destruction of ObjC lifetime types has side-effects.
3080 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
3081 return !RD->isCompleteDefinition() ||
3082 !RD->hasTrivialDefaultConstructor() ||
3083 !RD->hasTrivialDestructor();
3084 return false;
3085}
3086
3087static const ParsedAttr *getMSPropertyAttr(const ParsedAttributesView &list) {
3088 ParsedAttributesView::const_iterator Itr =
3089 llvm::find_if(list, [](const ParsedAttr &AL) {
3090 return AL.isDeclspecPropertyAttribute();
3091 });
3092 if (Itr != list.end())
3093 return &*Itr;
3094 return nullptr;
3095}
3096
3097// Check if there is a field shadowing.
3098void Sema::CheckShadowInheritedFields(const SourceLocation &Loc,
3099 DeclarationName FieldName,
3100 const CXXRecordDecl *RD,
3101 bool DeclIsField) {
3102 if (Diags.isIgnored(diag::warn_shadow_field, Loc))
3103 return;
3104
3105 // To record a shadowed field in a base
3106 std::map<CXXRecordDecl*, NamedDecl*> Bases;
3107 auto FieldShadowed = [&](const CXXBaseSpecifier *Specifier,
3108 CXXBasePath &Path) {
3109 const auto Base = Specifier->getType()->getAsCXXRecordDecl();
3110 // Record an ambiguous path directly
3111 if (Bases.find(Base) != Bases.end())
3112 return true;
3113 for (const auto Field : Base->lookup(FieldName)) {
3114 if ((isa<FieldDecl>(Field) || isa<IndirectFieldDecl>(Field)) &&
3115 Field->getAccess() != AS_private) {
3116 assert(Field->getAccess() != AS_none)((Field->getAccess() != AS_none) ? static_cast<void>
(0) : __assert_fail ("Field->getAccess() != AS_none", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 3116, __PRETTY_FUNCTION__))
;
3117 assert(Bases.find(Base) == Bases.end())((Bases.find(Base) == Bases.end()) ? static_cast<void> (
0) : __assert_fail ("Bases.find(Base) == Bases.end()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 3117, __PRETTY_FUNCTION__))
;
3118 Bases[Base] = Field;
3119 return true;
3120 }
3121 }
3122 return false;
3123 };
3124
3125 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
3126 /*DetectVirtual=*/true);
3127 if (!RD->lookupInBases(FieldShadowed, Paths))
3128 return;
3129
3130 for (const auto &P : Paths) {
3131 auto Base = P.back().Base->getType()->getAsCXXRecordDecl();
3132 auto It = Bases.find(Base);
3133 // Skip duplicated bases
3134 if (It == Bases.end())
3135 continue;
3136 auto BaseField = It->second;
3137 assert(BaseField->getAccess() != AS_private)((BaseField->getAccess() != AS_private) ? static_cast<void
> (0) : __assert_fail ("BaseField->getAccess() != AS_private"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 3137, __PRETTY_FUNCTION__))
;
3138 if (AS_none !=
3139 CXXRecordDecl::MergeAccess(P.Access, BaseField->getAccess())) {
3140 Diag(Loc, diag::warn_shadow_field)
3141 << FieldName << RD << Base << DeclIsField;
3142 Diag(BaseField->getLocation(), diag::note_shadow_field);
3143 Bases.erase(It);
3144 }
3145 }
3146}
3147
3148/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member
3149/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the
3150/// bitfield width if there is one, 'InitExpr' specifies the initializer if
3151/// one has been parsed, and 'InitStyle' is set if an in-class initializer is
3152/// present (but parsing it has been deferred).
3153NamedDecl *
3154Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D,
3155 MultiTemplateParamsArg TemplateParameterLists,
3156 Expr *BW, const VirtSpecifiers &VS,
3157 InClassInitStyle InitStyle) {
3158 const DeclSpec &DS = D.getDeclSpec();
3159 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
3160 DeclarationName Name = NameInfo.getName();
3161 SourceLocation Loc = NameInfo.getLoc();
3162
3163 // For anonymous bitfields, the location should point to the type.
3164 if (Loc.isInvalid())
3165 Loc = D.getBeginLoc();
3166
3167 Expr *BitWidth = static_cast<Expr*>(BW);
3168
3169 assert(isa<CXXRecordDecl>(CurContext))((isa<CXXRecordDecl>(CurContext)) ? static_cast<void
> (0) : __assert_fail ("isa<CXXRecordDecl>(CurContext)"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 3169, __PRETTY_FUNCTION__))
;
3170 assert(!DS.isFriendSpecified())((!DS.isFriendSpecified()) ? static_cast<void> (0) : __assert_fail
("!DS.isFriendSpecified()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 3170, __PRETTY_FUNCTION__))
;
3171
3172 bool isFunc = D.isDeclarationOfFunction();
3173 const ParsedAttr *MSPropertyAttr =
3174 getMSPropertyAttr(D.getDeclSpec().getAttributes());
3175
3176 if (cast<CXXRecordDecl>(CurContext)->isInterface()) {
3177 // The Microsoft extension __interface only permits public member functions
3178 // and prohibits constructors, destructors, operators, non-public member
3179 // functions, static methods and data members.
3180 unsigned InvalidDecl;
3181 bool ShowDeclName = true;
3182 if (!isFunc &&
3183 (DS.getStorageClassSpec() == DeclSpec::SCS_typedef || MSPropertyAttr))
3184 InvalidDecl = 0;
3185 else if (!isFunc)
3186 InvalidDecl = 1;
3187 else if (AS != AS_public)
3188 InvalidDecl = 2;
3189 else if (DS.getStorageClassSpec() == DeclSpec::SCS_static)
3190 InvalidDecl = 3;
3191 else switch (Name.getNameKind()) {
3192 case DeclarationName::CXXConstructorName:
3193 InvalidDecl = 4;
3194 ShowDeclName = false;
3195 break;
3196
3197 case DeclarationName::CXXDestructorName:
3198 InvalidDecl = 5;
3199 ShowDeclName = false;
3200 break;
3201
3202 case DeclarationName::CXXOperatorName:
3203 case DeclarationName::CXXConversionFunctionName:
3204 InvalidDecl = 6;
3205 break;
3206
3207 default:
3208 InvalidDecl = 0;
3209 break;
3210 }
3211
3212 if (InvalidDecl) {
3213 if (ShowDeclName)
3214 Diag(Loc, diag::err_invalid_member_in_interface)
3215 << (InvalidDecl-1) << Name;
3216 else
3217 Diag(Loc, diag::err_invalid_member_in_interface)
3218 << (InvalidDecl-1) << "";
3219 return nullptr;
3220 }
3221 }
3222
3223 // C++ 9.2p6: A member shall not be declared to have automatic storage
3224 // duration (auto, register) or with the extern storage-class-specifier.
3225 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class
3226 // data members and cannot be applied to names declared const or static,
3227 // and cannot be applied to reference members.
3228 switch (DS.getStorageClassSpec()) {
3229 case DeclSpec::SCS_unspecified:
3230 case DeclSpec::SCS_typedef:
3231 case DeclSpec::SCS_static:
3232 break;
3233 case DeclSpec::SCS_mutable:
3234 if (isFunc) {
3235 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function);
3236
3237 // FIXME: It would be nicer if the keyword was ignored only for this
3238 // declarator. Otherwise we could get follow-up errors.
3239 D.getMutableDeclSpec().ClearStorageClassSpecs();
3240 }
3241 break;
3242 default:
3243 Diag(DS.getStorageClassSpecLoc(),
3244 diag::err_storageclass_invalid_for_member);
3245 D.getMutableDeclSpec().ClearStorageClassSpecs();
3246 break;
3247 }
3248
3249 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified ||
3250 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) &&
3251 !isFunc);
3252
3253 if (DS.hasConstexprSpecifier() && isInstField) {
3254 SemaDiagnosticBuilder B =
3255 Diag(DS.getConstexprSpecLoc(), diag::err_invalid_constexpr_member);
3256 SourceLocation ConstexprLoc = DS.getConstexprSpecLoc();
3257 if (InitStyle == ICIS_NoInit) {
3258 B << 0 << 0;
3259 if (D.getDeclSpec().getTypeQualifiers() & DeclSpec::TQ_const)
3260 B << FixItHint::CreateRemoval(ConstexprLoc);
3261 else {
3262 B << FixItHint::CreateReplacement(ConstexprLoc, "const");
3263 D.getMutableDeclSpec().ClearConstexprSpec();
3264 const char *PrevSpec;
3265 unsigned DiagID;
3266 bool Failed = D.getMutableDeclSpec().SetTypeQual(
3267 DeclSpec::TQ_const, ConstexprLoc, PrevSpec, DiagID, getLangOpts());
3268 (void)Failed;
3269 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\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 3269, __PRETTY_FUNCTION__))
;
3270 }
3271 } else {
3272 B << 1;
3273 const char *PrevSpec;
3274 unsigned DiagID;
3275 if (D.getMutableDeclSpec().SetStorageClassSpec(
3276 *this, DeclSpec::SCS_static, ConstexprLoc, PrevSpec, DiagID,
3277 Context.getPrintingPolicy())) {
3278 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\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 3279, __PRETTY_FUNCTION__))
3279 "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\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 3279, __PRETTY_FUNCTION__))
;
3280 B << 1;
3281 } else {
3282 B << 0 << FixItHint::CreateInsertion(ConstexprLoc, "static ");
3283 isInstField = false;
3284 }
3285 }
3286 }
3287
3288 NamedDecl *Member;
3289 if (isInstField) {
3290 CXXScopeSpec &SS = D.getCXXScopeSpec();
3291
3292 // Data members must have identifiers for names.
3293 if (!Name.isIdentifier()) {
3294 Diag(Loc, diag::err_bad_variable_name)
3295 << Name;
3296 return nullptr;
3297 }
3298
3299 IdentifierInfo *II = Name.getAsIdentifierInfo();
3300
3301 // Member field could not be with "template" keyword.
3302 // So TemplateParameterLists should be empty in this case.
3303 if (TemplateParameterLists.size()) {
3304 TemplateParameterList* TemplateParams = TemplateParameterLists[0];
3305 if (TemplateParams->size()) {
3306 // There is no such thing as a member field template.
3307 Diag(D.getIdentifierLoc(), diag::err_template_member)
3308 << II
3309 << SourceRange(TemplateParams->getTemplateLoc(),
3310 TemplateParams->getRAngleLoc());
3311 } else {
3312 // There is an extraneous 'template<>' for this member.
3313 Diag(TemplateParams->getTemplateLoc(),
3314 diag::err_template_member_noparams)
3315 << II
3316 << SourceRange(TemplateParams->getTemplateLoc(),
3317 TemplateParams->getRAngleLoc());
3318 }
3319 return nullptr;
3320 }
3321
3322 if (SS.isSet() && !SS.isInvalid()) {
3323 // The user provided a superfluous scope specifier inside a class
3324 // definition:
3325 //
3326 // class X {
3327 // int X::member;
3328 // };
3329 if (DeclContext *DC = computeDeclContext(SS, false))
3330 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc(),
3331 D.getName().getKind() ==
3332 UnqualifiedIdKind::IK_TemplateId);
3333 else
3334 Diag(D.getIdentifierLoc(), diag::err_member_qualification)
3335 << Name << SS.getRange();
3336
3337 SS.clear();
3338 }
3339
3340 if (MSPropertyAttr) {
3341 Member = HandleMSProperty(S, cast<CXXRecordDecl>(CurContext), Loc, D,
3342 BitWidth, InitStyle, AS, *MSPropertyAttr);
3343 if (!Member)
3344 return nullptr;
3345 isInstField = false;
3346 } else {
3347 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D,
3348 BitWidth, InitStyle, AS);
3349 if (!Member)
3350 return nullptr;
3351 }
3352
3353 CheckShadowInheritedFields(Loc, Name, cast<CXXRecordDecl>(CurContext));
3354 } else {
3355 Member = HandleDeclarator(S, D, TemplateParameterLists);
3356 if (!Member)
3357 return nullptr;
3358
3359 // Non-instance-fields can't have a bitfield.
3360 if (BitWidth) {
3361 if (Member->isInvalidDecl()) {
3362 // don't emit another diagnostic.
3363 } else if (isa<VarDecl>(Member) || isa<VarTemplateDecl>(Member)) {
3364 // C++ 9.6p3: A bit-field shall not be a static member.
3365 // "static member 'A' cannot be a bit-field"
3366 Diag(Loc, diag::err_static_not_bitfield)
3367 << Name << BitWidth->getSourceRange();
3368 } else if (isa<TypedefDecl>(Member)) {
3369 // "typedef member 'x' cannot be a bit-field"
3370 Diag(Loc, diag::err_typedef_not_bitfield)
3371 << Name << BitWidth->getSourceRange();
3372 } else {
3373 // A function typedef ("typedef int f(); f a;").
3374 // C++ 9.6p3: A bit-field shall have integral or enumeration type.
3375 Diag(Loc, diag::err_not_integral_type_bitfield)
3376 << Name << cast<ValueDecl>(Member)->getType()
3377 << BitWidth->getSourceRange();
3378 }
3379
3380 BitWidth = nullptr;
3381 Member->setInvalidDecl();
3382 }
3383
3384 NamedDecl *NonTemplateMember = Member;
3385 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member))
3386 NonTemplateMember = FunTmpl->getTemplatedDecl();
3387 else if (VarTemplateDecl *VarTmpl = dyn_cast<VarTemplateDecl>(Member))
3388 NonTemplateMember = VarTmpl->getTemplatedDecl();
3389
3390 Member->setAccess(AS);
3391
3392 // If we have declared a member function template or static data member
3393 // template, set the access of the templated declaration as well.
3394 if (NonTemplateMember != Member)
3395 NonTemplateMember->setAccess(AS);
3396
3397 // C++ [temp.deduct.guide]p3:
3398 // A deduction guide [...] for a member class template [shall be
3399 // declared] with the same access [as the template].
3400 if (auto *DG = dyn_cast<CXXDeductionGuideDecl>(NonTemplateMember)) {
3401 auto *TD = DG->getDeducedTemplate();
3402 // Access specifiers are only meaningful if both the template and the
3403 // deduction guide are from the same scope.
3404 if (AS != TD->getAccess() &&
3405 TD->getDeclContext()->getRedeclContext()->Equals(
3406 DG->getDeclContext()->getRedeclContext())) {
3407 Diag(DG->getBeginLoc(), diag::err_deduction_guide_wrong_access);
3408 Diag(TD->getBeginLoc(), diag::note_deduction_guide_template_access)
3409 << TD->getAccess();
3410 const AccessSpecDecl *LastAccessSpec = nullptr;
3411 for (const auto *D : cast<CXXRecordDecl>(CurContext)->decls()) {
3412 if (const auto *AccessSpec = dyn_cast<AccessSpecDecl>(D))
3413 LastAccessSpec = AccessSpec;
3414 }
3415 assert(LastAccessSpec && "differing access with no access specifier")((LastAccessSpec && "differing access with no access specifier"
) ? static_cast<void> (0) : __assert_fail ("LastAccessSpec && \"differing access with no access specifier\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 3415, __PRETTY_FUNCTION__))
;
3416 Diag(LastAccessSpec->getBeginLoc(), diag::note_deduction_guide_access)
3417 << AS;
3418 }
3419 }
3420 }
3421
3422 if (VS.isOverrideSpecified())
3423 Member->addAttr(OverrideAttr::Create(Context, VS.getOverrideLoc(),
3424 AttributeCommonInfo::AS_Keyword));
3425 if (VS.isFinalSpecified())
3426 Member->addAttr(FinalAttr::Create(
3427 Context, VS.getFinalLoc(), AttributeCommonInfo::AS_Keyword,
3428 static_cast<FinalAttr::Spelling>(VS.isFinalSpelledSealed())));
3429
3430 if (VS.getLastLocation().isValid()) {
3431 // Update the end location of a method that has a virt-specifiers.
3432 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member))
3433 MD->setRangeEnd(VS.getLastLocation());
3434 }
3435
3436 CheckOverrideControl(Member);
3437
3438 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 ?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 3438, __PRETTY_FUNCTION__))
;
3439
3440 if (isInstField) {
3441 FieldDecl *FD = cast<FieldDecl>(Member);
3442 FieldCollector->Add(FD);
3443
3444 if (!Diags.isIgnored(diag::warn_unused_private_field, FD->getLocation())) {
3445 // Remember all explicit private FieldDecls that have a name, no side
3446 // effects and are not part of a dependent type declaration.
3447 if (!FD->isImplicit() && FD->getDeclName() &&
3448 FD->getAccess() == AS_private &&
3449 !FD->hasAttr<UnusedAttr>() &&
3450 !FD->getParent()->isDependentContext() &&
3451 !InitializationHasSideEffects(*FD))
3452 UnusedPrivateFields.insert(FD);
3453 }
3454 }
3455
3456 return Member;
3457}
3458
3459namespace {
3460 class UninitializedFieldVisitor
3461 : public EvaluatedExprVisitor<UninitializedFieldVisitor> {
3462 Sema &S;
3463 // List of Decls to generate a warning on. Also remove Decls that become
3464 // initialized.
3465 llvm::SmallPtrSetImpl<ValueDecl*> &Decls;
3466 // List of base classes of the record. Classes are removed after their
3467 // initializers.
3468 llvm::SmallPtrSetImpl<QualType> &BaseClasses;
3469 // Vector of decls to be removed from the Decl set prior to visiting the
3470 // nodes. These Decls may have been initialized in the prior initializer.
3471 llvm::SmallVector<ValueDecl*, 4> DeclsToRemove;
3472 // If non-null, add a note to the warning pointing back to the constructor.
3473 const CXXConstructorDecl *Constructor;
3474 // Variables to hold state when processing an initializer list. When
3475 // InitList is true, special case initialization of FieldDecls matching
3476 // InitListFieldDecl.
3477 bool InitList;
3478 FieldDecl *InitListFieldDecl;
3479 llvm::SmallVector<unsigned, 4> InitFieldIndex;
3480
3481 public:
3482 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited;
3483 UninitializedFieldVisitor(Sema &S,
3484 llvm::SmallPtrSetImpl<ValueDecl*> &Decls,
3485 llvm::SmallPtrSetImpl<QualType> &BaseClasses)
3486 : Inherited(S.Context), S(S), Decls(Decls), BaseClasses(BaseClasses),
3487 Constructor(nullptr), InitList(false), InitListFieldDecl(nullptr) {}
3488
3489 // Returns true if the use of ME is not an uninitialized use.
3490 bool IsInitListMemberExprInitialized(MemberExpr *ME,
3491 bool CheckReferenceOnly) {
3492 llvm::SmallVector<FieldDecl*, 4> Fields;
3493 bool ReferenceField = false;
3494 while (ME) {
3495 FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl());
3496 if (!FD)
3497 return false;
3498 Fields.push_back(FD);
3499 if (FD->getType()->isReferenceType())
3500 ReferenceField = true;
3501 ME = dyn_cast<MemberExpr>(ME->getBase()->IgnoreParenImpCasts());
3502 }
3503
3504 // Binding a reference to an uninitialized field is not an
3505 // uninitialized use.
3506 if (CheckReferenceOnly && !ReferenceField)
3507 return true;
3508
3509 llvm::SmallVector<unsigned, 4> UsedFieldIndex;
3510 // Discard the first field since it is the field decl that is being
3511 // initialized.
3512 for (auto I = Fields.rbegin() + 1, E = Fields.rend(); I != E; ++I) {
3513 UsedFieldIndex.push_back((*I)->getFieldIndex());
3514 }
3515
3516 for (auto UsedIter = UsedFieldIndex.begin(),
3517 UsedEnd = UsedFieldIndex.end(),
3518 OrigIter = InitFieldIndex.begin(),
3519 OrigEnd = InitFieldIndex.end();
3520 UsedIter != UsedEnd && OrigIter != OrigEnd; ++UsedIter, ++OrigIter) {
3521 if (*UsedIter < *OrigIter)
3522 return true;
3523 if (*UsedIter > *OrigIter)
3524 break;
3525 }
3526
3527 return false;
3528 }
3529
3530 void HandleMemberExpr(MemberExpr *ME, bool CheckReferenceOnly,
3531 bool AddressOf) {
3532 if (isa<EnumConstantDecl>(ME->getMemberDecl()))
3533 return;
3534
3535 // FieldME is the inner-most MemberExpr that is not an anonymous struct
3536 // or union.
3537 MemberExpr *FieldME = ME;
3538
3539 bool AllPODFields = FieldME->getType().isPODType(S.Context);
3540
3541 Expr *Base = ME;
3542 while (MemberExpr *SubME =
3543 dyn_cast<MemberExpr>(Base->IgnoreParenImpCasts())) {
3544
3545 if (isa<VarDecl>(SubME->getMemberDecl()))
3546 return;
3547
3548 if (FieldDecl *FD = dyn_cast<FieldDecl>(SubME->getMemberDecl()))
3549 if (!FD->isAnonymousStructOrUnion())
3550 FieldME = SubME;
3551
3552 if (!FieldME->getType().isPODType(S.Context))
3553 AllPODFields = false;
3554
3555 Base = SubME->getBase();
3556 }
3557
3558 if (!isa<CXXThisExpr>(Base->IgnoreParenImpCasts()))
3559 return;
3560
3561 if (AddressOf && AllPODFields)
3562 return;
3563
3564 ValueDecl* FoundVD = FieldME->getMemberDecl();
3565
3566 if (ImplicitCastExpr *BaseCast = dyn_cast<ImplicitCastExpr>(Base)) {
3567 while (isa<ImplicitCastExpr>(BaseCast->getSubExpr())) {
3568 BaseCast = cast<ImplicitCastExpr>(BaseCast->getSubExpr());
3569 }
3570
3571 if (BaseCast->getCastKind() == CK_UncheckedDerivedToBase) {
3572 QualType T = BaseCast->getType();
3573 if (T->isPointerType() &&
3574 BaseClasses.count(T->getPointeeType())) {
3575 S.Diag(FieldME->getExprLoc(), diag::warn_base_class_is_uninit)
3576 << T->getPointeeType() << FoundVD;
3577 }
3578 }
3579 }
3580
3581 if (!Decls.count(FoundVD))
3582 return;
3583
3584 const bool IsReference = FoundVD->getType()->isReferenceType();
3585
3586 if (InitList && !AddressOf && FoundVD == InitListFieldDecl) {
3587 // Special checking for initializer lists.
3588 if (IsInitListMemberExprInitialized(ME, CheckReferenceOnly)) {
3589 return;
3590 }
3591 } else {
3592 // Prevent double warnings on use of unbounded references.
3593 if (CheckReferenceOnly && !IsReference)
3594 return;
3595 }
3596
3597 unsigned diag = IsReference
3598 ? diag::warn_reference_field_is_uninit
3599 : diag::warn_field_is_uninit;
3600 S.Diag(FieldME->getExprLoc(), diag) << FoundVD;
3601 if (Constructor)
3602 S.Diag(Constructor->getLocation(),
3603 diag::note_uninit_in_this_constructor)
3604 << (Constructor->isDefaultConstructor() && Constructor->isImplicit());
3605
3606 }
3607
3608 void HandleValue(Expr *E, bool AddressOf) {
3609 E = E->IgnoreParens();
3610
3611 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
3612 HandleMemberExpr(ME, false /*CheckReferenceOnly*/,
3613 AddressOf /*AddressOf*/);
3614 return;
3615 }
3616
3617 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) {
3618 Visit(CO->getCond());
3619 HandleValue(CO->getTrueExpr(), AddressOf);
3620 HandleValue(CO->getFalseExpr(), AddressOf);
3621 return;
3622 }
3623
3624 if (BinaryConditionalOperator *BCO =
3625 dyn_cast<BinaryConditionalOperator>(E)) {
3626 Visit(BCO->getCond());
3627 HandleValue(BCO->getFalseExpr(), AddressOf);
3628 return;
3629 }
3630
3631 if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(E)) {
3632 HandleValue(OVE->getSourceExpr(), AddressOf);
3633 return;
3634 }
3635
3636 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
3637 switch (BO->getOpcode()) {
3638 default:
3639 break;
3640 case(BO_PtrMemD):
3641 case(BO_PtrMemI):
3642 HandleValue(BO->getLHS(), AddressOf);
3643 Visit(BO->getRHS());
3644 return;
3645 case(BO_Comma):
3646 Visit(BO->getLHS());
3647 HandleValue(BO->getRHS(), AddressOf);
3648 return;
3649 }
3650 }
3651
3652 Visit(E);
3653 }
3654
3655 void CheckInitListExpr(InitListExpr *ILE) {
3656 InitFieldIndex.push_back(0);
3657 for (auto Child : ILE->children()) {
3658 if (InitListExpr *SubList = dyn_cast<InitListExpr>(Child)) {
3659 CheckInitListExpr(SubList);
3660 } else {
3661 Visit(Child);
3662 }
3663 ++InitFieldIndex.back();
3664 }
3665 InitFieldIndex.pop_back();
3666 }
3667
3668 void CheckInitializer(Expr *E, const CXXConstructorDecl *FieldConstructor,
3669 FieldDecl *Field, const Type *BaseClass) {
3670 // Remove Decls that may have been initialized in the previous
3671 // initializer.
3672 for (ValueDecl* VD : DeclsToRemove)
3673 Decls.erase(VD);
3674 DeclsToRemove.clear();
3675
3676 Constructor = FieldConstructor;
3677 InitListExpr *ILE = dyn_cast<InitListExpr>(E);
3678
3679 if (ILE && Field) {
3680 InitList = true;
3681 InitListFieldDecl = Field;
3682 InitFieldIndex.clear();
3683 CheckInitListExpr(ILE);
3684 } else {
3685 InitList = false;
3686 Visit(E);
3687 }
3688
3689 if (Field)
3690 Decls.erase(Field);
3691 if (BaseClass)
3692 BaseClasses.erase(BaseClass->getCanonicalTypeInternal());
3693 }
3694
3695 void VisitMemberExpr(MemberExpr *ME) {
3696 // All uses of unbounded reference fields will warn.
3697 HandleMemberExpr(ME, true /*CheckReferenceOnly*/, false /*AddressOf*/);
3698 }
3699
3700 void VisitImplicitCastExpr(ImplicitCastExpr *E) {
3701 if (E->getCastKind() == CK_LValueToRValue) {
3702 HandleValue(E->getSubExpr(), false /*AddressOf*/);
3703 return;
3704 }
3705
3706 Inherited::VisitImplicitCastExpr(E);
3707 }
3708
3709 void VisitCXXConstructExpr(CXXConstructExpr *E) {
3710 if (E->getConstructor()->isCopyConstructor()) {
3711 Expr *ArgExpr = E->getArg(0);
3712 if (InitListExpr *ILE = dyn_cast<InitListExpr>(ArgExpr))
3713 if (ILE->getNumInits() == 1)
3714 ArgExpr = ILE->getInit(0);
3715 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(ArgExpr))
3716 if (ICE->getCastKind() == CK_NoOp)
3717 ArgExpr = ICE->getSubExpr();
3718 HandleValue(ArgExpr, false /*AddressOf*/);
3719 return;
3720 }
3721 Inherited::VisitCXXConstructExpr(E);
3722 }
3723
3724 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) {
3725 Expr *Callee = E->getCallee();
3726 if (isa<MemberExpr>(Callee)) {
3727 HandleValue(Callee, false /*AddressOf*/);
3728 for (auto Arg : E->arguments())
3729 Visit(Arg);
3730 return;
3731 }
3732
3733 Inherited::VisitCXXMemberCallExpr(E);
3734 }
3735
3736 void VisitCallExpr(CallExpr *E) {
3737 // Treat std::move as a use.
3738 if (E->isCallToStdMove()) {
3739 HandleValue(E->getArg(0), /*AddressOf=*/false);
3740 return;
3741 }
3742
3743 Inherited::VisitCallExpr(E);
3744 }
3745
3746 void VisitCXXOperatorCallExpr(CXXOperatorCallExpr *E) {
3747 Expr *Callee = E->getCallee();
3748
3749 if (isa<UnresolvedLookupExpr>(Callee))
3750 return Inherited::VisitCXXOperatorCallExpr(E);
3751
3752 Visit(Callee);
3753 for (auto Arg : E->arguments())
3754 HandleValue(Arg->IgnoreParenImpCasts(), false /*AddressOf*/);
3755 }
3756
3757 void VisitBinaryOperator(BinaryOperator *E) {
3758 // If a field assignment is detected, remove the field from the
3759 // uninitiailized field set.
3760 if (E->getOpcode() == BO_Assign)
3761 if (MemberExpr *ME = dyn_cast<MemberExpr>(E->getLHS()))
3762 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl()))
3763 if (!FD->getType()->isReferenceType())
3764 DeclsToRemove.push_back(FD);
3765
3766 if (E->isCompoundAssignmentOp()) {
3767 HandleValue(E->getLHS(), false /*AddressOf*/);
3768 Visit(E->getRHS());
3769 return;
3770 }
3771
3772 Inherited::VisitBinaryOperator(E);
3773 }
3774
3775 void VisitUnaryOperator(UnaryOperator *E) {
3776 if (E->isIncrementDecrementOp()) {
3777 HandleValue(E->getSubExpr(), false /*AddressOf*/);
3778 return;
3779 }
3780 if (E->getOpcode() == UO_AddrOf) {
3781 if (MemberExpr *ME = dyn_cast<MemberExpr>(E->getSubExpr())) {
3782 HandleValue(ME->getBase(), true /*AddressOf*/);
3783 return;
3784 }
3785 }
3786
3787 Inherited::VisitUnaryOperator(E);
3788 }
3789 };
3790
3791 // Diagnose value-uses of fields to initialize themselves, e.g.
3792 // foo(foo)
3793 // where foo is not also a parameter to the constructor.
3794 // Also diagnose across field uninitialized use such as
3795 // x(y), y(x)
3796 // TODO: implement -Wuninitialized and fold this into that framework.
3797 static void DiagnoseUninitializedFields(
3798 Sema &SemaRef, const CXXConstructorDecl *Constructor) {
3799
3800 if (SemaRef.getDiagnostics().isIgnored(diag::warn_field_is_uninit,
3801 Constructor->getLocation())) {
3802 return;
3803 }
3804
3805 if (Constructor->isInvalidDecl())
3806 return;
3807
3808 const CXXRecordDecl *RD = Constructor->getParent();
3809
3810 if (RD->isDependentContext())
3811 return;
3812
3813 // Holds fields that are uninitialized.
3814 llvm::SmallPtrSet<ValueDecl*, 4> UninitializedFields;
3815
3816 // At the beginning, all fields are uninitialized.
3817 for (auto *I : RD->decls()) {
3818 if (auto *FD = dyn_cast<FieldDecl>(I)) {
3819 UninitializedFields.insert(FD);
3820 } else if (auto *IFD = dyn_cast<IndirectFieldDecl>(I)) {
3821 UninitializedFields.insert(IFD->getAnonField());
3822 }
3823 }
3824
3825 llvm::SmallPtrSet<QualType, 4> UninitializedBaseClasses;
3826 for (auto I : RD->bases())
3827 UninitializedBaseClasses.insert(I.getType().getCanonicalType());
3828
3829 if (UninitializedFields.empty() && UninitializedBaseClasses.empty())
3830 return;
3831
3832 UninitializedFieldVisitor UninitializedChecker(SemaRef,
3833 UninitializedFields,
3834 UninitializedBaseClasses);
3835
3836 for (const auto *FieldInit : Constructor->inits()) {
3837 if (UninitializedFields.empty() && UninitializedBaseClasses.empty())
3838 break;
3839
3840 Expr *InitExpr = FieldInit->getInit();
3841 if (!InitExpr)
3842 continue;
3843
3844 if (CXXDefaultInitExpr *Default =
3845 dyn_cast<CXXDefaultInitExpr>(InitExpr)) {
3846 InitExpr = Default->getExpr();
3847 if (!InitExpr)
3848 continue;
3849 // In class initializers will point to the constructor.
3850 UninitializedChecker.CheckInitializer(InitExpr, Constructor,
3851 FieldInit->getAnyMember(),
3852 FieldInit->getBaseClass());
3853 } else {
3854 UninitializedChecker.CheckInitializer(InitExpr, nullptr,
3855 FieldInit->getAnyMember(),
3856 FieldInit->getBaseClass());
3857 }
3858 }
3859 }
3860} // namespace
3861
3862/// Enter a new C++ default initializer scope. After calling this, the
3863/// caller must call \ref ActOnFinishCXXInClassMemberInitializer, even if
3864/// parsing or instantiating the initializer failed.
3865void Sema::ActOnStartCXXInClassMemberInitializer() {
3866 // Create a synthetic function scope to represent the call to the constructor
3867 // that notionally surrounds a use of this initializer.
3868 PushFunctionScope();
3869}
3870
3871void Sema::ActOnStartTrailingRequiresClause(Scope *S, Declarator &D) {
3872 if (!D.isFunctionDeclarator())
3873 return;
3874 auto &FTI = D.getFunctionTypeInfo();
3875 if (!FTI.Params)
3876 return;
3877 for (auto &Param : ArrayRef<DeclaratorChunk::ParamInfo>(FTI.Params,
3878 FTI.NumParams)) {
3879 auto *ParamDecl = cast<NamedDecl>(Param.Param);
3880 if (ParamDecl->getDeclName())
3881 PushOnScopeChains(ParamDecl, S, /*AddToContext=*/false);
3882 }
3883}
3884
3885ExprResult Sema::ActOnFinishTrailingRequiresClause(ExprResult ConstraintExpr) {
3886 if (ConstraintExpr.isInvalid())
3887 return ExprError();
3888 return CorrectDelayedTyposInExpr(ConstraintExpr);
3889}
3890
3891/// This is invoked after parsing an in-class initializer for a
3892/// non-static C++ class member, and after instantiating an in-class initializer
3893/// in a class template. Such actions are deferred until the class is complete.
3894void Sema::ActOnFinishCXXInClassMemberInitializer(Decl *D,
3895 SourceLocation InitLoc,
3896 Expr *InitExpr) {
3897 // Pop the notional constructor scope we created earlier.
3898 PopFunctionScopeInfo(nullptr, D);
3899
3900 FieldDecl *FD = dyn_cast<FieldDecl>(D);
3901 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\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 3902, __PRETTY_FUNCTION__))
3902 "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\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 3902, __PRETTY_FUNCTION__))
;
3903
3904 if (!InitExpr) {
3905 D->setInvalidDecl();
3906 if (FD)
3907 FD->removeInClassInitializer();
3908 return;
3909 }
3910
3911 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) {
3912 FD->setInvalidDecl();
3913 FD->removeInClassInitializer();
3914 return;
3915 }
3916
3917 ExprResult Init = InitExpr;
3918 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) {
3919 InitializedEntity Entity =
3920 InitializedEntity::InitializeMemberFromDefaultMemberInitializer(FD);
3921 InitializationKind Kind =
3922 FD->getInClassInitStyle() == ICIS_ListInit
3923 ? InitializationKind::CreateDirectList(InitExpr->getBeginLoc(),
3924 InitExpr->getBeginLoc(),
3925 InitExpr->getEndLoc())
3926 : InitializationKind::CreateCopy(InitExpr->getBeginLoc(), InitLoc);
3927 InitializationSequence Seq(*this, Entity, Kind, InitExpr);
3928 Init = Seq.Perform(*this, Entity, Kind, InitExpr);
3929 if (Init.isInvalid()) {
3930 FD->setInvalidDecl();
3931 return;
3932 }
3933 }
3934
3935 // C++11 [class.base.init]p7:
3936 // The initialization of each base and member constitutes a
3937 // full-expression.
3938 Init = ActOnFinishFullExpr(Init.get(), InitLoc, /*DiscardedValue*/ false);
3939 if (Init.isInvalid()) {
3940 FD->setInvalidDecl();
3941 return;
3942 }
3943
3944 InitExpr = Init.get();
3945
3946 FD->setInClassInitializer(InitExpr);
3947}
3948
3949/// Find the direct and/or virtual base specifiers that
3950/// correspond to the given base type, for use in base initialization
3951/// within a constructor.
3952static bool FindBaseInitializer(Sema &SemaRef,
3953 CXXRecordDecl *ClassDecl,
3954 QualType BaseType,
3955 const CXXBaseSpecifier *&DirectBaseSpec,
3956 const CXXBaseSpecifier *&VirtualBaseSpec) {
3957 // First, check for a direct base class.
3958 DirectBaseSpec = nullptr;
3959 for (const auto &Base : ClassDecl->bases()) {
3960 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base.getType())) {
3961 // We found a direct base of this type. That's what we're
3962 // initializing.
3963 DirectBaseSpec = &Base;
3964 break;
3965 }
3966 }
3967
3968 // Check for a virtual base class.
3969 // FIXME: We might be able to short-circuit this if we know in advance that
3970 // there are no virtual bases.
3971 VirtualBaseSpec = nullptr;
3972 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) {
3973 // We haven't found a base yet; search the class hierarchy for a
3974 // virtual base class.
3975 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
3976 /*DetectVirtual=*/false);
3977 if (SemaRef.IsDerivedFrom(ClassDecl->getLocation(),
3978 SemaRef.Context.getTypeDeclType(ClassDecl),
3979 BaseType, Paths)) {
3980 for (CXXBasePaths::paths_iterator Path = Paths.begin();
3981 Path != Paths.end(); ++Path) {
3982 if (Path->back().Base->isVirtual()) {
3983 VirtualBaseSpec = Path->back().Base;
3984 break;
3985 }
3986 }
3987 }
3988 }
3989
3990 return DirectBaseSpec || VirtualBaseSpec;
3991}
3992
3993/// Handle a C++ member initializer using braced-init-list syntax.
3994MemInitResult
3995Sema::ActOnMemInitializer(Decl *ConstructorD,
3996 Scope *S,
3997 CXXScopeSpec &SS,
3998 IdentifierInfo *MemberOrBase,
3999 ParsedType TemplateTypeTy,
4000 const DeclSpec &DS,
4001 SourceLocation IdLoc,
4002 Expr *InitList,
4003 SourceLocation EllipsisLoc) {
4004 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy,
4005 DS, IdLoc, InitList,
4006 EllipsisLoc);
4007}
4008
4009/// Handle a C++ member initializer using parentheses syntax.
4010MemInitResult
4011Sema::ActOnMemInitializer(Decl *ConstructorD,
4012 Scope *S,
4013 CXXScopeSpec &SS,
4014 IdentifierInfo *MemberOrBase,
4015 ParsedType TemplateTypeTy,
4016 const DeclSpec &DS,
4017 SourceLocation IdLoc,
4018 SourceLocation LParenLoc,
4019 ArrayRef<Expr *> Args,
4020 SourceLocation RParenLoc,
4021 SourceLocation EllipsisLoc) {
4022 Expr *List = ParenListExpr::Create(Context, LParenLoc, Args, RParenLoc);
4023 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy,
4024 DS, IdLoc, List, EllipsisLoc);
4025}
4026
4027namespace {
4028
4029// Callback to only accept typo corrections that can be a valid C++ member
4030// intializer: either a non-static field member or a base class.
4031class MemInitializerValidatorCCC final : public CorrectionCandidateCallback {
4032public:
4033 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl)
4034 : ClassDecl(ClassDecl) {}
4035
4036 bool ValidateCandidate(const TypoCorrection &candidate) override {
4037 if (NamedDecl *ND = candidate.getCorrectionDecl()) {
4038 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND))
4039 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl);
4040 return isa<TypeDecl>(ND);
4041 }
4042 return false;
4043 }
4044
4045 std::unique_ptr<CorrectionCandidateCallback> clone() override {
4046 return std::make_unique<MemInitializerValidatorCCC>(*this);
4047 }
4048
4049private:
4050 CXXRecordDecl *ClassDecl;
4051};
4052
4053}
4054
4055ValueDecl *Sema::tryLookupCtorInitMemberDecl(CXXRecordDecl *ClassDecl,
4056 CXXScopeSpec &SS,
4057 ParsedType TemplateTypeTy,
4058 IdentifierInfo *MemberOrBase) {
4059 if (SS.getScopeRep() || TemplateTypeTy)
4060 return nullptr;
4061 DeclContext::lookup_result Result = ClassDecl->lookup(MemberOrBase);
4062 if (Result.empty())
4063 return nullptr;
4064 ValueDecl *Member;
4065 if ((Member = dyn_cast<FieldDecl>(Result.front())) ||
4066 (Member = dyn_cast<IndirectFieldDecl>(Result.front())))
4067 return Member;
4068 return nullptr;
4069}
4070
4071/// Handle a C++ member initializer.
4072MemInitResult
4073Sema::BuildMemInitializer(Decl *ConstructorD,
4074 Scope *S,
4075 CXXScopeSpec &SS,
4076 IdentifierInfo *MemberOrBase,
4077 ParsedType TemplateTypeTy,
4078 const DeclSpec &DS,
4079 SourceLocation IdLoc,
4080 Expr *Init,
4081 SourceLocation EllipsisLoc) {
4082 ExprResult Res = CorrectDelayedTyposInExpr(Init);
4083 if (!Res.isUsable())
4084 return true;
4085 Init = Res.get();
4086
4087 if (!ConstructorD)
4088 return true;
4089
4090 AdjustDeclIfTemplate(ConstructorD);
4091
4092 CXXConstructorDecl *Constructor
4093 = dyn_cast<CXXConstructorDecl>(ConstructorD);
4094 if (!Constructor) {
4095 // The user wrote a constructor initializer on a function that is
4096 // not a C++ constructor. Ignore the error for now, because we may
4097 // have more member initializers coming; we'll diagnose it just
4098 // once in ActOnMemInitializers.
4099 return true;
4100 }
4101
4102 CXXRecordDecl *ClassDecl = Constructor->getParent();
4103
4104 // C++ [class.base.init]p2:
4105 // Names in a mem-initializer-id are looked up in the scope of the
4106 // constructor's class and, if not found in that scope, are looked
4107 // up in the scope containing the constructor's definition.
4108 // [Note: if the constructor's class contains a member with the
4109 // same name as a direct or virtual base class of the class, a
4110 // mem-initializer-id naming the member or base class and composed
4111 // of a single identifier refers to the class member. A
4112 // mem-initializer-id for the hidden base class may be specified
4113 // using a qualified name. ]
4114
4115 // Look for a member, first.
4116 if (ValueDecl *Member = tryLookupCtorInitMemberDecl(
4117 ClassDecl, SS, TemplateTypeTy, MemberOrBase)) {
4118 if (EllipsisLoc.isValid())
4119 Diag(EllipsisLoc, diag::err_pack_expansion_member_init)
4120 << MemberOrBase
4121 << SourceRange(IdLoc, Init->getSourceRange().getEnd());
4122
4123 return BuildMemberInitializer(Member, Init, IdLoc);
4124 }
4125 // It didn't name a member, so see if it names a class.
4126 QualType BaseType;
4127 TypeSourceInfo *TInfo = nullptr;
4128
4129 if (TemplateTypeTy) {
4130 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo);
4131 if (BaseType.isNull())
4132 return true;
4133 } else if (DS.getTypeSpecType() == TST_decltype) {
4134 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc());
4135 } else if (DS.getTypeSpecType() == TST_decltype_auto) {
4136 Diag(DS.getTypeSpecTypeLoc(), diag::err_decltype_auto_invalid);
4137 return true;
4138 } else {
4139 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName);
4140 LookupParsedName(R, S, &SS);
4141
4142 TypeDecl *TyD = R.getAsSingle<TypeDecl>();
4143 if (!TyD) {
4144 if (R.isAmbiguous()) return true;
4145
4146 // We don't want access-control diagnostics here.
4147 R.suppressDiagnostics();
4148
4149 if (SS.isSet() && isDependentScopeSpecifier(SS)) {
4150 bool NotUnknownSpecialization = false;
4151 DeclContext *DC = computeDeclContext(SS, false);
4152 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC))
4153 NotUnknownSpecialization = !Record->hasAnyDependentBases();
4154
4155 if (!NotUnknownSpecialization) {
4156 // When the scope specifier can refer to a member of an unknown
4157 // specialization, we take it as a type name.
4158 BaseType = CheckTypenameType(ETK_None, SourceLocation(),
4159 SS.getWithLocInContext(Context),
4160 *MemberOrBase, IdLoc);
4161 if (BaseType.isNull())
4162 return true;
4163
4164 TInfo = Context.CreateTypeSourceInfo(BaseType);
4165 DependentNameTypeLoc TL =
4166 TInfo->getTypeLoc().castAs<DependentNameTypeLoc>();
4167 if (!TL.isNull()) {
4168 TL.setNameLoc(IdLoc);
4169 TL.setElaboratedKeywordLoc(SourceLocation());
4170 TL.setQualifierLoc(SS.getWithLocInContext(Context));
4171 }
4172
4173 R.clear();
4174 R.setLookupName(MemberOrBase);
4175 }
4176 }
4177
4178 // If no results were found, try to correct typos.
4179 TypoCorrection Corr;
4180 MemInitializerValidatorCCC CCC(ClassDecl);
4181 if (R.empty() && BaseType.isNull() &&
4182 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS,
4183 CCC, CTK_ErrorRecovery, ClassDecl))) {
4184 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) {
4185 // We have found a non-static data member with a similar
4186 // name to what was typed; complain and initialize that
4187 // member.
4188 diagnoseTypo(Corr,
4189 PDiag(diag::err_mem_init_not_member_or_class_suggest)
4190 << MemberOrBase << true);
4191 return BuildMemberInitializer(Member, Init, IdLoc);
4192 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) {
4193 const CXXBaseSpecifier *DirectBaseSpec;
4194 const CXXBaseSpecifier *VirtualBaseSpec;
4195 if (FindBaseInitializer(*this, ClassDecl,
4196 Context.getTypeDeclType(Type),
4197 DirectBaseSpec, VirtualBaseSpec)) {
4198 // We have found a direct or virtual base class with a
4199 // similar name to what was typed; complain and initialize
4200 // that base class.
4201 diagnoseTypo(Corr,
4202 PDiag(diag::err_mem_init_not_member_or_class_suggest)
4203 << MemberOrBase << false,
4204 PDiag() /*Suppress note, we provide our own.*/);
4205
4206 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec ? DirectBaseSpec
4207 : VirtualBaseSpec;
4208 Diag(BaseSpec->getBeginLoc(), diag::note_base_class_specified_here)
4209 << BaseSpec->getType() << BaseSpec->getSourceRange();
4210
4211 TyD = Type;
4212 }
4213 }
4214 }
4215
4216 if (!TyD && BaseType.isNull()) {
4217 Diag(IdLoc, diag::err_mem_init_not_member_or_class)
4218 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd());
4219 return true;
4220 }
4221 }
4222
4223 if (BaseType.isNull()) {
4224 BaseType = Context.getTypeDeclType(TyD);
4225 MarkAnyDeclReferenced(TyD->getLocation(), TyD, /*OdrUse=*/false);
4226 if (SS.isSet()) {
4227 BaseType = Context.getElaboratedType(ETK_None, SS.getScopeRep(),
4228 BaseType);
4229 TInfo = Context.CreateTypeSourceInfo(BaseType);
4230 ElaboratedTypeLoc TL = TInfo->getTypeLoc().castAs<ElaboratedTypeLoc>();
4231 TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(IdLoc);
4232 TL.setElaboratedKeywordLoc(SourceLocation());
4233 TL.setQualifierLoc(SS.getWithLocInContext(Context));
4234 }
4235 }
4236 }
4237
4238 if (!TInfo)
4239 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc);
4240
4241 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc);
4242}
4243
4244MemInitResult
4245Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init,
4246 SourceLocation IdLoc) {
4247 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member);
4248 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member);
4249 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\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 4250, __PRETTY_FUNCTION__))
4250 "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\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 4250, __PRETTY_FUNCTION__))
;
4251
4252 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer))
4253 return true;
4254
4255 if (Member->isInvalidDecl())
4256 return true;
4257
4258 MultiExprArg Args;
4259 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
4260 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs());
4261 } else if (InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) {
4262 Args = MultiExprArg(InitList->getInits(), InitList->getNumInits());
4263 } else {
4264 // Template instantiation doesn't reconstruct ParenListExprs for us.
4265 Args = Init;
4266 }
4267
4268 SourceRange InitRange = Init->getSourceRange();
4269
4270 if (Member->getType()->isDependentType() || Init->isTypeDependent()) {
4271 // Can't check initialization for a member of dependent type or when
4272 // any of the arguments are type-dependent expressions.
4273 DiscardCleanupsInEvaluationContext();
4274 } else {
4275 bool InitList = false;
4276 if (isa<InitListExpr>(Init)) {
4277 InitList = true;
4278 Args = Init;
4279 }
4280
4281 // Initialize the member.
4282 InitializedEntity MemberEntity =
4283 DirectMember ? InitializedEntity::InitializeMember(DirectMember, nullptr)
4284 : InitializedEntity::InitializeMember(IndirectMember,
4285 nullptr);
4286 InitializationKind Kind =
4287 InitList ? InitializationKind::CreateDirectList(
4288 IdLoc, Init->getBeginLoc(), Init->getEndLoc())
4289 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(),
4290 InitRange.getEnd());
4291
4292 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args);
4293 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, Args,
4294 nullptr);
4295 if (MemberInit.isInvalid())
4296 return true;
4297
4298 // C++11 [class.base.init]p7:
4299 // The initialization of each base and member constitutes a
4300 // full-expression.
4301 MemberInit = ActOnFinishFullExpr(MemberInit.get(), InitRange.getBegin(),
4302 /*DiscardedValue*/ false);
4303 if (MemberInit.isInvalid())
4304 return true;
4305
4306 Init = MemberInit.get();
4307 }
4308
4309 if (DirectMember) {
4310 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc,
4311 InitRange.getBegin(), Init,
4312 InitRange.getEnd());
4313 } else {
4314 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc,
4315 InitRange.getBegin(), Init,
4316 InitRange.getEnd());
4317 }
4318}
4319
4320MemInitResult
4321Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init,
4322 CXXRecordDecl *ClassDecl) {
4323 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin();
4324 if (!LangOpts.CPlusPlus11)
4325 return Diag(NameLoc, diag::err_delegating_ctor)
4326 << TInfo->getTypeLoc().getLocalSourceRange();
4327 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor);
4328
4329 bool InitList = true;
4330 MultiExprArg Args = Init;
4331 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
4332 InitList = false;
4333 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs());
4334 }
4335
4336 SourceRange InitRange = Init->getSourceRange();
4337 // Initialize the object.
4338 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation(
4339 QualType(ClassDecl->getTypeForDecl(), 0));
4340 InitializationKind Kind =
4341 InitList ? InitializationKind::CreateDirectList(
4342 NameLoc, Init->getBeginLoc(), Init->getEndLoc())
4343 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(),
4344 InitRange.getEnd());
4345 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args);
4346 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind,
4347 Args, nullptr);
4348 if (DelegationInit.isInvalid())
4349 return true;
4350
4351 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?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 4352, __PRETTY_FUNCTION__))
4352 "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?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 4352, __PRETTY_FUNCTION__))
;
4353
4354 // C++11 [class.base.init]p7:
4355 // The initialization of each base and member constitutes a
4356 // full-expression.
4357 DelegationInit = ActOnFinishFullExpr(
4358 DelegationInit.get(), InitRange.getBegin(), /*DiscardedValue*/ false);
4359 if (DelegationInit.isInvalid())
4360 return true;
4361
4362 // If we are in a dependent context, template instantiation will
4363 // perform this type-checking again. Just save the arguments that we
4364 // received in a ParenListExpr.
4365 // FIXME: This isn't quite ideal, since our ASTs don't capture all
4366 // of the information that we have about the base
4367 // initializer. However, deconstructing the ASTs is a dicey process,
4368 // and this approach is far more likely to get the corner cases right.
4369 if (CurContext->isDependentContext())
4370 DelegationInit = Init;
4371
4372 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(),
4373 DelegationInit.getAs<Expr>(),
4374 InitRange.getEnd());
4375}
4376
4377MemInitResult
4378Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo,
4379 Expr *Init, CXXRecordDecl *ClassDecl,
4380 SourceLocation EllipsisLoc) {
4381 SourceLocation BaseLoc
4382 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin();
4383
4384 if (!BaseType->isDependentType() && !BaseType->isRecordType())
4385 return Diag(BaseLoc, diag::err_base_init_does_not_name_class)
4386 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange();
4387
4388 // C++ [class.base.init]p2:
4389 // [...] Unless the mem-initializer-id names a nonstatic data
4390 // member of the constructor's class or a direct or virtual base
4391 // of that class, the mem-initializer is ill-formed. A
4392 // mem-initializer-list can initialize a base class using any
4393 // name that denotes that base class type.
4394 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent();
4395
4396 SourceRange InitRange = Init->getSourceRange();
4397 if (EllipsisLoc.isValid()) {
4398 // This is a pack expansion.
4399 if (!BaseType->containsUnexpandedParameterPack()) {
4400 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs)
4401 << SourceRange(BaseLoc, InitRange.getEnd());
4402
4403 EllipsisLoc = SourceLocation();
4404 }
4405 } else {
4406 // Check for any unexpanded parameter packs.
4407 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer))
4408 return true;
4409
4410 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer))
4411 return true;
4412 }
4413
4414 // Check for direct and virtual base classes.
4415 const CXXBaseSpecifier *DirectBaseSpec = nullptr;
4416 const CXXBaseSpecifier *VirtualBaseSpec = nullptr;
4417 if (!Dependent) {
4418 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0),
4419 BaseType))
4420 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl);
4421
4422 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec,
4423 VirtualBaseSpec);
4424
4425 // C++ [base.class.init]p2:
4426 // Unless the mem-initializer-id names a nonstatic data member of the
4427 // constructor's class or a direct or virtual base of that class, the
4428 // mem-initializer is ill-formed.
4429 if (!DirectBaseSpec && !VirtualBaseSpec) {
4430 // If the class has any dependent bases, then it's possible that
4431 // one of those types will resolve to the same type as
4432 // BaseType. Therefore, just treat this as a dependent base
4433 // class initialization. FIXME: Should we try to check the
4434 // initialization anyway? It seems odd.
4435 if (ClassDecl->hasAnyDependentBases())
4436 Dependent = true;
4437 else
4438 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual)
4439 << BaseType << Context.getTypeDeclType(ClassDecl)
4440 << BaseTInfo->getTypeLoc().getLocalSourceRange();
4441 }
4442 }
4443
4444 if (Dependent) {
4445 DiscardCleanupsInEvaluationContext();
4446
4447 return new (Context) CXXCtorInitializer(Context, BaseTInfo,
4448 /*IsVirtual=*/false,
4449 InitRange.getBegin(), Init,
4450 InitRange.getEnd(), EllipsisLoc);
4451 }
4452
4453 // C++ [base.class.init]p2:
4454 // If a mem-initializer-id is ambiguous because it designates both
4455 // a direct non-virtual base class and an inherited virtual base
4456 // class, the mem-initializer is ill-formed.
4457 if (DirectBaseSpec && VirtualBaseSpec)
4458 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual)
4459 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange();
4460
4461 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec;
4462 if (!BaseSpec)
4463 BaseSpec = VirtualBaseSpec;
4464
4465 // Initialize the base.
4466 bool InitList = true;
4467 MultiExprArg Args = Init;
4468 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
4469 InitList = false;
4470 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs());
4471 }
4472
4473 InitializedEntity BaseEntity =
4474 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec);
4475 InitializationKind Kind =
4476 InitList ? InitializationKind::CreateDirectList(BaseLoc)
4477 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(),
4478 InitRange.getEnd());
4479 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args);
4480 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, Args, nullptr);
4481 if (BaseInit.isInvalid())
4482 return true;
4483
4484 // C++11 [class.base.init]p7:
4485 // The initialization of each base and member constitutes a
4486 // full-expression.
4487 BaseInit = ActOnFinishFullExpr(BaseInit.get(), InitRange.getBegin(),
4488 /*DiscardedValue*/ false);
4489 if (BaseInit.isInvalid())
4490 return true;
4491
4492 // If we are in a dependent context, template instantiation will
4493 // perform this type-checking again. Just save the arguments that we
4494 // received in a ParenListExpr.
4495 // FIXME: This isn't quite ideal, since our ASTs don't capture all
4496 // of the information that we have about the base
4497 // initializer. However, deconstructing the ASTs is a dicey process,
4498 // and this approach is far more likely to get the corner cases right.
4499 if (CurContext->isDependentContext())
4500 BaseInit = Init;
4501
4502 return new (Context) CXXCtorInitializer(Context, BaseTInfo,
4503 BaseSpec->isVirtual(),
4504 InitRange.getBegin(),
4505 BaseInit.getAs<Expr>(),
4506 InitRange.getEnd(), EllipsisLoc);
4507}
4508
4509// Create a static_cast\<T&&>(expr).
4510static Expr *CastForMoving(Sema &SemaRef, Expr *E, QualType T = QualType()) {
4511 if (T.isNull()) T = E->getType();
4512 QualType TargetType = SemaRef.BuildReferenceType(
4513 T, /*SpelledAsLValue*/false, SourceLocation(), DeclarationName());
4514 SourceLocation ExprLoc = E->getBeginLoc();
4515 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo(
4516 TargetType, ExprLoc);
4517
4518 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E,
4519 SourceRange(ExprLoc, ExprLoc),
4520 E->getSourceRange()).get();
4521}
4522
4523/// ImplicitInitializerKind - How an implicit base or member initializer should
4524/// initialize its base or member.
4525enum ImplicitInitializerKind {
4526 IIK_Default,
4527 IIK_Copy,
4528 IIK_Move,
4529 IIK_Inherit
4530};
4531
4532static bool
4533BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor,
4534 ImplicitInitializerKind ImplicitInitKind,
4535 CXXBaseSpecifier *BaseSpec,
4536 bool IsInheritedVirtualBase,
4537 CXXCtorInitializer *&CXXBaseInit) {
4538 InitializedEntity InitEntity
4539 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec,
4540 IsInheritedVirtualBase);
4541
4542 ExprResult BaseInit;
4543
4544 switch (ImplicitInitKind) {
4545 case IIK_Inherit:
4546 case IIK_Default: {
4547 InitializationKind InitKind
4548 = InitializationKind::CreateDefault(Constructor->getLocation());
4549 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None);
4550 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, None);
4551 break;
4552 }
4553
4554 case IIK_Move:
4555 case IIK_Copy: {
4556 bool Moving = ImplicitInitKind == IIK_Move;
4557 ParmVarDecl *Param = Constructor->getParamDecl(0);
4558 QualType ParamType = Param->getType().getNonReferenceType();
4559
4560 Expr *CopyCtorArg =
4561 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(),
4562 SourceLocation(), Param, false,
4563 Constructor->getLocation(), ParamType,
4564 VK_LValue, nullptr);
4565
4566 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg));
4567
4568 // Cast to the base class to avoid ambiguities.
4569 QualType ArgTy =
4570 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(),
4571 ParamType.getQualifiers());
4572
4573 if (Moving) {
4574 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg);
4575 }
4576
4577 CXXCastPath BasePath;
4578 BasePath.push_back(BaseSpec);
4579 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy,
4580 CK_UncheckedDerivedToBase,
4581 Moving ? VK_XValue : VK_LValue,
4582 &BasePath).get();
4583
4584 InitializationKind InitKind
4585 = InitializationKind::CreateDirect(Constructor->getLocation(),
4586 SourceLocation(), SourceLocation());
4587 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, CopyCtorArg);
4588 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, CopyCtorArg);
4589 break;
4590 }
4591 }
4592
4593 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit);
4594 if (BaseInit.isInvalid())
4595 return true;
4596
4597 CXXBaseInit =
4598 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context,
4599 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(),
4600 SourceLocation()),
4601 BaseSpec->isVirtual(),
4602 SourceLocation(),
4603 BaseInit.getAs<Expr>(),
4604 SourceLocation(),
4605 SourceLocation());
4606
4607 return false;
4608}
4609
4610static bool RefersToRValueRef(Expr *MemRef) {
4611 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl();
4612 return Referenced->getType()->isRValueReferenceType();
4613}
4614
4615static bool
4616BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor,
4617 ImplicitInitializerKind ImplicitInitKind,
4618 FieldDecl *Field, IndirectFieldDecl *Indirect,
4619 CXXCtorInitializer *&CXXMemberInit) {
4620 if (Field->isInvalidDecl())
4621 return true;
4622
4623 SourceLocation Loc = Constructor->getLocation();
4624
4625 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) {
4626 bool Moving = ImplicitInitKind == IIK_Move;
4627 ParmVarDecl *Param = Constructor->getParamDecl(0);
4628 QualType ParamType = Param->getType().getNonReferenceType();
4629
4630 // Suppress copying zero-width bitfields.
4631 if (Field->isZeroLengthBitField(SemaRef.Context))
4632 return false;
4633
4634 Expr *MemberExprBase =
4635 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(),
4636 SourceLocation(), Param, false,
4637 Loc, ParamType, VK_LValue, nullptr);
4638
4639 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase));
4640
4641 if (Moving) {
4642 MemberExprBase = CastForMoving(SemaRef, MemberExprBase);
4643 }
4644
4645 // Build a reference to this field within the parameter.
4646 CXXScopeSpec SS;
4647 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc,
4648 Sema::LookupMemberName);
4649 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect)
4650 : cast<ValueDecl>(Field), AS_public);
4651 MemberLookup.resolveKind();
4652 ExprResult CtorArg
4653 = SemaRef.BuildMemberReferenceExpr(MemberExprBase,
4654 ParamType, Loc,
4655 /*IsArrow=*/false,
4656 SS,
4657 /*TemplateKWLoc=*/SourceLocation(),
4658 /*FirstQualifierInScope=*/nullptr,
4659 MemberLookup,
4660 /*TemplateArgs=*/nullptr,
4661 /*S*/nullptr);
4662 if (CtorArg.isInvalid())
4663 return true;
4664
4665 // C++11 [class.copy]p15:
4666 // - if a member m has rvalue reference type T&&, it is direct-initialized
4667 // with static_cast<T&&>(x.m);
4668 if (RefersToRValueRef(CtorArg.get())) {
4669 CtorArg = CastForMoving(SemaRef, CtorArg.get());
4670 }
4671
4672 InitializedEntity Entity =
4673 Indirect ? InitializedEntity::InitializeMember(Indirect, nullptr,
4674 /*Implicit*/ true)
4675 : InitializedEntity::InitializeMember(Field, nullptr,
4676 /*Implicit*/ true);
4677
4678 // Direct-initialize to use the copy constructor.
4679 InitializationKind InitKind =
4680 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation());
4681
4682 Expr *CtorArgE = CtorArg.getAs<Expr>();
4683 InitializationSequence InitSeq(SemaRef, Entity, InitKind, CtorArgE);
4684 ExprResult MemberInit =
4685 InitSeq.Perform(SemaRef, Entity, InitKind, MultiExprArg(&CtorArgE, 1));
4686 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit);
4687 if (MemberInit.isInvalid())
4688 return true;
4689
4690 if (Indirect)
4691 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(
4692 SemaRef.Context, Indirect, Loc, Loc, MemberInit.getAs<Expr>(), Loc);
4693 else
4694 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(
4695 SemaRef.Context, Field, Loc, Loc, MemberInit.getAs<Expr>(), Loc);
4696 return false;
4697 }
4698
4699 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!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 4700, __PRETTY_FUNCTION__))
4700 "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!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 4700, __PRETTY_FUNCTION__))
;
4701
4702 QualType FieldBaseElementType =
4703 SemaRef.Context.getBaseElementType(Field->getType());
4704
4705 if (FieldBaseElementType->isRecordType()) {
4706 InitializedEntity InitEntity =
4707 Indirect ? InitializedEntity::InitializeMember(Indirect, nullptr,
4708 /*Implicit*/ true)
4709 : InitializedEntity::InitializeMember(Field, nullptr,
4710 /*Implicit*/ true);
4711 InitializationKind InitKind =
4712 InitializationKind::CreateDefault(Loc);
4713
4714 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None);
4715 ExprResult MemberInit =
4716 InitSeq.Perform(SemaRef, InitEntity, InitKind, None);
4717
4718 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit);
4719 if (MemberInit.isInvalid())
4720 return true;
4721
4722 if (Indirect)
4723 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context,
4724 Indirect, Loc,
4725 Loc,
4726 MemberInit.get(),
4727 Loc);
4728 else
4729 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context,
4730 Field, Loc, Loc,
4731 MemberInit.get(),
4732 Loc);
4733 return false;
4734 }
4735
4736 if (!Field->getParent()->isUnion()) {
4737 if (FieldBaseElementType->isReferenceType()) {
4738 SemaRef.Diag(Constructor->getLocation(),
4739 diag::err_uninitialized_member_in_ctor)
4740 << (int)Constructor->isImplicit()
4741 << SemaRef.Context.getTagDeclType(Constructor->getParent())
4742 << 0 << Field->getDeclName();
4743 SemaRef.Diag(Field->getLocation(), diag::note_declared_at);
4744 return true;
4745 }
4746
4747 if (FieldBaseElementType.isConstQualified()) {
4748 SemaRef.Diag(Constructor->getLocation(),
4749 diag::err_uninitialized_member_in_ctor)
4750 << (int)Constructor->isImplicit()
4751 << SemaRef.Context.getTagDeclType(Constructor->getParent())
4752 << 1 << Field->getDeclName();
4753 SemaRef.Diag(Field->getLocation(), diag::note_declared_at);
4754 return true;
4755 }
4756 }
4757
4758 if (FieldBaseElementType.hasNonTrivialObjCLifetime()) {
4759 // ARC and Weak:
4760 // Default-initialize Objective-C pointers to NULL.
4761 CXXMemberInit
4762 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field,
4763 Loc, Loc,
4764 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()),
4765 Loc);
4766 return false;
4767 }
4768
4769 // Nothing to initialize.
4770 CXXMemberInit = nullptr;
4771 return false;
4772}
4773
4774namespace {
4775struct BaseAndFieldInfo {
4776 Sema &S;
4777 CXXConstructorDecl *Ctor;
4778 bool AnyErrorsInInits;
4779 ImplicitInitializerKind IIK;
4780 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields;
4781 SmallVector<CXXCtorInitializer*, 8> AllToInit;
4782 llvm::DenseMap<TagDecl*, FieldDecl*> ActiveUnionMember;
4783
4784 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits)
4785 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) {
4786 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted();
4787 if (Ctor->getInheritedConstructor())
4788 IIK = IIK_Inherit;
4789 else if (Generated && Ctor->isCopyConstructor())
4790 IIK = IIK_Copy;
4791 else if (Generated && Ctor->isMoveConstructor())
4792 IIK = IIK_Move;
4793 else
4794 IIK = IIK_Default;
4795 }
4796
4797 bool isImplicitCopyOrMove() const {
4798 switch (IIK) {
4799 case IIK_Copy:
4800 case IIK_Move:
4801 return true;
4802
4803 case IIK_Default:
4804 case IIK_Inherit:
4805 return false;
4806 }
4807
4808 llvm_unreachable("Invalid ImplicitInitializerKind!")::llvm::llvm_unreachable_internal("Invalid ImplicitInitializerKind!"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 4808)
;
4809 }
4810
4811 bool addFieldInitializer(CXXCtorInitializer *Init) {
4812 AllToInit.push_back(Init);
4813
4814 // Check whether this initializer makes the field "used".
4815 if (Init->getInit()->HasSideEffects(S.Context))
4816 S.UnusedPrivateFields.remove(Init->getAnyMember());
4817
4818 return false;
4819 }
4820
4821 bool isInactiveUnionMember(FieldDecl *Field) {
4822 RecordDecl *Record = Field->getParent();
4823 if (!Record->isUnion())
4824 return false;
4825
4826 if (FieldDecl *Active =
4827 ActiveUnionMember.lookup(Record->getCanonicalDecl()))
4828 return Active != Field->getCanonicalDecl();
4829
4830 // In an implicit copy or move constructor, ignore any in-class initializer.
4831 if (isImplicitCopyOrMove())
4832 return true;
4833
4834 // If there's no explicit initialization, the field is active only if it
4835 // has an in-class initializer...
4836 if (Field->hasInClassInitializer())
4837 return false;
4838 // ... or it's an anonymous struct or union whose class has an in-class
4839 // initializer.
4840 if (!Field->isAnonymousStructOrUnion())
4841 return true;
4842 CXXRecordDecl *FieldRD = Field->getType()->getAsCXXRecordDecl();
4843 return !FieldRD->hasInClassInitializer();
4844 }
4845
4846 /// Determine whether the given field is, or is within, a union member
4847 /// that is inactive (because there was an initializer given for a different
4848 /// member of the union, or because the union was not initialized at all).
4849 bool isWithinInactiveUnionMember(FieldDecl *Field,
4850 IndirectFieldDecl *Indirect) {
4851 if (!Indirect)
4852 return isInactiveUnionMember(Field);
4853
4854 for (auto *C : Indirect->chain()) {
4855 FieldDecl *Field = dyn_cast<FieldDecl>(C);
4856 if (Field && isInactiveUnionMember(Field))
4857 return true;
4858 }
4859 return false;
4860 }
4861};
4862}
4863
4864/// Determine whether the given type is an incomplete or zero-lenfgth
4865/// array type.
4866static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) {
4867 if (T->isIncompleteArrayType())
4868 return true;
4869
4870 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) {
4871 if (!ArrayT->getSize())
4872 return true;
4873
4874 T = ArrayT->getElementType();
4875 }
4876
4877 return false;
4878}
4879
4880static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info,
4881 FieldDecl *Field,
4882 IndirectFieldDecl *Indirect = nullptr) {
4883 if (Field->isInvalidDecl())
4884 return false;
4885
4886 // Overwhelmingly common case: we have a direct initializer for this field.
4887 if (CXXCtorInitializer *Init =
4888 Info.AllBaseFields.lookup(Field->getCanonicalDecl()))
4889 return Info.addFieldInitializer(Init);
4890
4891 // C++11 [class.base.init]p8:
4892 // if the entity is a non-static data member that has a
4893 // brace-or-equal-initializer and either
4894 // -- the constructor's class is a union and no other variant member of that
4895 // union is designated by a mem-initializer-id or
4896 // -- the constructor's class is not a union, and, if the entity is a member
4897 // of an anonymous union, no other member of that union is designated by
4898 // a mem-initializer-id,
4899 // the entity is initialized as specified in [dcl.init].
4900 //
4901 // We also apply the same rules to handle anonymous structs within anonymous
4902 // unions.
4903 if (Info.isWithinInactiveUnionMember(Field, Indirect))
4904 return false;
4905
4906 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) {
4907 ExprResult DIE =
4908 SemaRef.BuildCXXDefaultInitExpr(Info.Ctor->getLocation(), Field);
4909 if (DIE.isInvalid())
4910 return true;
4911
4912 auto Entity = InitializedEntity::InitializeMember(Field, nullptr, true);
4913 SemaRef.checkInitializerLifetime(Entity, DIE.get());
4914
4915 CXXCtorInitializer *Init;
4916 if (Indirect)
4917 Init = new (SemaRef.Context)
4918 CXXCtorInitializer(SemaRef.Context, Indirect, SourceLocation(),
4919 SourceLocation(), DIE.get(), SourceLocation());
4920 else
4921 Init = new (SemaRef.Context)
4922 CXXCtorInitializer(SemaRef.Context, Field, SourceLocation(),
4923 SourceLocation(), DIE.get(), SourceLocation());
4924 return Info.addFieldInitializer(Init);
4925 }
4926
4927 // Don't initialize incomplete or zero-length arrays.
4928 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType()))
4929 return false;
4930
4931 // Don't try to build an implicit initializer if there were semantic
4932 // errors in any of the initializers (and therefore we might be
4933 // missing some that the user actually wrote).
4934 if (Info.AnyErrorsInInits)
4935 return false;
4936
4937 CXXCtorInitializer *Init = nullptr;
4938 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field,
4939 Indirect, Init))
4940 return true;
4941
4942 if (!Init)
4943 return false;
4944
4945 return Info.addFieldInitializer(Init);
4946}
4947
4948bool
4949Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor,
4950 CXXCtorInitializer *Initializer) {
4951 assert(Initializer->isDelegatingInitializer())((Initializer->isDelegatingInitializer()) ? static_cast<
void> (0) : __assert_fail ("Initializer->isDelegatingInitializer()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 4951, __PRETTY_FUNCTION__))
;
4952 Constructor->setNumCtorInitializers(1);
4953 CXXCtorInitializer **initializer =
4954 new (Context) CXXCtorInitializer*[1];
4955 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*));
4956 Constructor->setCtorInitializers(initializer);
4957
4958 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) {
4959 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor);
4960 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation());
4961 }
4962
4963 DelegatingCtorDecls.push_back(Constructor);
4964
4965 DiagnoseUninitializedFields(*this, Constructor);
4966
4967 return false;
4968}
4969
4970bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, bool AnyErrors,
4971 ArrayRef<CXXCtorInitializer *> Initializers) {
4972 if (Constructor->isDependentContext()) {
4973 // Just store the initializers as written, they will be checked during
4974 // instantiation.
4975 if (!Initializers.empty()) {
4976 Constructor->setNumCtorInitializers(Initializers.size());
4977 CXXCtorInitializer **baseOrMemberInitializers =
4978 new (Context) CXXCtorInitializer*[Initializers.size()];
4979 memcpy(baseOrMemberInitializers, Initializers.data(),
4980 Initializers.size() * sizeof(CXXCtorInitializer*));
4981 Constructor->setCtorInitializers(baseOrMemberInitializers);
4982 }
4983
4984 // Let template instantiation know whether we had errors.
4985 if (AnyErrors)
4986 Constructor->setInvalidDecl();
4987
4988 return false;
4989 }
4990
4991 BaseAndFieldInfo Info(*this, Constructor, AnyErrors);
4992
4993 // We need to build the initializer AST according to order of construction
4994 // and not what user specified in the Initializers list.
4995 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition();
4996 if (!ClassDecl)
4997 return true;
4998
4999 bool HadError = false;
5000
5001 for (unsigned i = 0; i < Initializers.size(); i++) {
5002 CXXCtorInitializer *Member = Initializers[i];
5003
5004 if (Member->isBaseInitializer())
5005 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member;
5006 else {
5007 Info.AllBaseFields[Member->getAnyMember()->getCanonicalDecl()] = Member;
5008
5009 if (IndirectFieldDecl *F = Member->getIndirectMember()) {
5010 for (auto *C : F->chain()) {
5011 FieldDecl *FD = dyn_cast<FieldDecl>(C);
5012 if (FD && FD->getParent()->isUnion())
5013 Info.ActiveUnionMember.insert(std::make_pair(
5014 FD->getParent()->getCanonicalDecl(), FD->getCanonicalDecl()));
5015 }
5016 } else if (FieldDecl *FD = Member->getMember()) {
5017 if (FD->getParent()->isUnion())
5018 Info.ActiveUnionMember.insert(std::make_pair(
5019 FD->getParent()->getCanonicalDecl(), FD->getCanonicalDecl()));
5020 }
5021 }
5022 }
5023
5024 // Keep track of the direct virtual bases.
5025 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases;
5026 for (auto &I : ClassDecl->bases()) {
5027 if (I.isVirtual())
5028 DirectVBases.insert(&I);
5029 }
5030
5031 // Push virtual bases before others.
5032 for (auto &VBase : ClassDecl->vbases()) {
5033 if (CXXCtorInitializer *Value
5034 = Info.AllBaseFields.lookup(VBase.getType()->getAs<RecordType>())) {
5035 // [class.base.init]p7, per DR257:
5036 // A mem-initializer where the mem-initializer-id names a virtual base
5037 // class is ignored during execution of a constructor of any class that
5038 // is not the most derived class.
5039 if (ClassDecl->isAbstract()) {
5040 // FIXME: Provide a fixit to remove the base specifier. This requires
5041 // tracking the location of the associated comma for a base specifier.
5042 Diag(Value->getSourceLocation(), diag::warn_abstract_vbase_init_ignored)
5043 << VBase.getType() << ClassDecl;
5044 DiagnoseAbstractType(ClassDecl);
5045 }
5046
5047 Info.AllToInit.push_back(Value);
5048 } else if (!AnyErrors && !ClassDecl->isAbstract()) {
5049 // [class.base.init]p8, per DR257:
5050 // If a given [...] base class is not named by a mem-initializer-id
5051 // [...] and the entity is not a virtual base class of an abstract
5052 // class, then [...] the entity is default-initialized.
5053 bool IsInheritedVirtualBase = !DirectVBases.count(&VBase);
5054 CXXCtorInitializer *CXXBaseInit;
5055 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK,
5056 &VBase, IsInheritedVirtualBase,
5057 CXXBaseInit)) {
5058 HadError = true;
5059 continue;
5060 }
5061
5062 Info.AllToInit.push_back(CXXBaseInit);
5063 }
5064 }
5065
5066 // Non-virtual bases.
5067 for (auto &Base : ClassDecl->bases()) {
5068 // Virtuals are in the virtual base list and already constructed.
5069 if (Base.isVirtual())
5070 continue;
5071
5072 if (CXXCtorInitializer *Value
5073 = Info.AllBaseFields.lookup(Base.getType()->getAs<RecordType>())) {
5074 Info.AllToInit.push_back(Value);
5075 } else if (!AnyErrors) {
5076 CXXCtorInitializer *CXXBaseInit;
5077 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK,
5078 &Base, /*IsInheritedVirtualBase=*/false,
5079 CXXBaseInit)) {
5080 HadError = true;
5081 continue;
5082 }
5083
5084 Info.AllToInit.push_back(CXXBaseInit);
5085 }
5086 }
5087
5088 // Fields.
5089 for (auto *Mem : ClassDecl->decls()) {
5090 if (auto *F = dyn_cast<FieldDecl>(Mem)) {
5091 // C++ [class.bit]p2:
5092 // A declaration for a bit-field that omits the identifier declares an
5093 // unnamed bit-field. Unnamed bit-fields are not members and cannot be
5094 // initialized.
5095 if (F->isUnnamedBitfield())
5096 continue;
5097
5098 // If we're not generating the implicit copy/move constructor, then we'll
5099 // handle anonymous struct/union fields based on their individual
5100 // indirect fields.
5101 if (F->isAnonymousStructOrUnion() && !Info.isImplicitCopyOrMove())
5102 continue;
5103
5104 if (CollectFieldInitializer(*this, Info, F))
5105 HadError = true;
5106 continue;
5107 }
5108
5109 // Beyond this point, we only consider default initialization.
5110 if (Info.isImplicitCopyOrMove())
5111 continue;
5112
5113 if (auto *F = dyn_cast<IndirectFieldDecl>(Mem)) {
5114 if (F->getType()->isIncompleteArrayType()) {
5115 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\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 5116, __PRETTY_FUNCTION__))
5116 "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\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 5116, __PRETTY_FUNCTION__))
;
5117 continue;
5118 }
5119
5120 // Initialize each field of an anonymous struct individually.
5121 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F))
5122 HadError = true;
5123
5124 continue;
5125 }
5126 }
5127
5128 unsigned NumInitializers = Info.AllToInit.size();
5129 if (NumInitializers > 0) {
5130 Constructor->setNumCtorInitializers(NumInitializers);
5131 CXXCtorInitializer **baseOrMemberInitializers =
5132 new (Context) CXXCtorInitializer*[NumInitializers];
5133 memcpy(baseOrMemberInitializers, Info.AllToInit.data(),
5134 NumInitializers * sizeof(CXXCtorInitializer*));
5135 Constructor->setCtorInitializers(baseOrMemberInitializers);
5136
5137 // Constructors implicitly reference the base and member
5138 // destructors.
5139 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(),
5140 Constructor->getParent());
5141 }
5142
5143 return HadError;
5144}
5145
5146static void PopulateKeysForFields(FieldDecl *Field, SmallVectorImpl<const void*> &IdealInits) {
5147 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) {
5148 const RecordDecl *RD = RT->getDecl();
5149 if (RD->isAnonymousStructOrUnion()) {
5150 for (auto *Field : RD->fields())
5151 PopulateKeysForFields(Field, IdealInits);
5152 return;
5153 }
5154 }
5155 IdealInits.push_back(Field->getCanonicalDecl());
5156}
5157
5158static const void *GetKeyForBase(ASTContext &Context, QualType BaseType) {
5159 return Context.getCanonicalType(BaseType).getTypePtr();
5160}
5161
5162static const void *GetKeyForMember(ASTContext &Context,
5163 CXXCtorInitializer *Member) {
5164 if (!Member->isAnyMemberInitializer())
5165 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0));
5166
5167 return Member->getAnyMember()->getCanonicalDecl();
5168}
5169
5170static void DiagnoseBaseOrMemInitializerOrder(
5171 Sema &SemaRef, const CXXConstructorDecl *Constructor,
5172 ArrayRef<CXXCtorInitializer *> Inits) {
5173 if (Constructor->getDeclContext()->isDependentContext())
5174 return;
5175
5176 // Don't check initializers order unless the warning is enabled at the
5177 // location of at least one initializer.
5178 bool ShouldCheckOrder = false;
5179 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) {
5180 CXXCtorInitializer *Init = Inits[InitIndex];
5181 if (!SemaRef.Diags.isIgnored(diag::warn_initializer_out_of_order,
5182 Init->getSourceLocation())) {
5183 ShouldCheckOrder = true;
5184 break;
5185 }
5186 }
5187 if (!ShouldCheckOrder)
5188 return;
5189
5190 // Build the list of bases and members in the order that they'll
5191 // actually be initialized. The explicit initializers should be in
5192 // this same order but may be missing things.
5193 SmallVector<const void*, 32> IdealInitKeys;
5194
5195 const CXXRecordDecl *ClassDecl = Constructor->getParent();
5196
5197 // 1. Virtual bases.
5198 for (const auto &VBase : ClassDecl->vbases())
5199 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase.getType()));
5200
5201 // 2. Non-virtual bases.
5202 for (const auto &Base : ClassDecl->bases()) {
5203 if (Base.isVirtual())
5204 continue;
5205 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base.getType()));
5206 }
5207
5208 // 3. Direct fields.
5209 for (auto *Field : ClassDecl->fields()) {
5210 if (Field->isUnnamedBitfield())
5211 continue;
5212
5213 PopulateKeysForFields(Field, IdealInitKeys);
5214 }
5215
5216 unsigned NumIdealInits = IdealInitKeys.size();
5217 unsigned IdealIndex = 0;
5218
5219 CXXCtorInitializer *PrevInit = nullptr;
5220 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) {
5221 CXXCtorInitializer *Init = Inits[InitIndex];
5222 const void *InitKey = GetKeyForMember(SemaRef.Context, Init);
5223
5224 // Scan forward to try to find this initializer in the idealized
5225 // initializers list.
5226 for (; IdealIndex != NumIdealInits; ++IdealIndex)
5227 if (InitKey == IdealInitKeys[IdealIndex])
5228 break;
5229
5230 // If we didn't find this initializer, it must be because we
5231 // scanned past it on a previous iteration. That can only
5232 // happen if we're out of order; emit a warning.
5233 if (IdealIndex == NumIdealInits && PrevInit) {
5234 Sema::SemaDiagnosticBuilder D =
5235 SemaRef.Diag(PrevInit->getSourceLocation(),
5236 diag::warn_initializer_out_of_order);
5237
5238 if (PrevInit->isAnyMemberInitializer())
5239 D << 0 << PrevInit->getAnyMember()->getDeclName();
5240 else
5241 D << 1 << PrevInit->getTypeSourceInfo()->getType();
5242
5243 if (Init->isAnyMemberInitializer())
5244 D << 0 << Init->getAnyMember()->getDeclName();
5245 else
5246 D << 1 << Init->getTypeSourceInfo()->getType();
5247
5248 // Move back to the initializer's location in the ideal list.
5249 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex)
5250 if (InitKey == IdealInitKeys[IdealIndex])
5251 break;
5252
5253 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\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 5254, __PRETTY_FUNCTION__))
5254 "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\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 5254, __PRETTY_FUNCTION__))
;
5255 }
5256
5257 PrevInit = Init;
5258 }
5259}
5260
5261namespace {
5262bool CheckRedundantInit(Sema &S,
5263 CXXCtorInitializer *Init,
5264 CXXCtorInitializer *&PrevInit) {
5265 if (!PrevInit) {
5266 PrevInit = Init;
5267 return false;
5268 }
5269
5270 if (FieldDecl *Field = Init->getAnyMember())
5271 S.Diag(Init->getSourceLocation(),
5272 diag::err_multiple_mem_initialization)
5273 << Field->getDeclName()
5274 << Init->getSourceRange();
5275 else {
5276 const Type *BaseClass = Init->getBaseClass();
5277 assert(BaseClass && "neither field nor base")((BaseClass && "neither field nor base") ? static_cast
<void> (0) : __assert_fail ("BaseClass && \"neither field nor base\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 5277, __PRETTY_FUNCTION__))
;
5278 S.Diag(Init->getSourceLocation(),
5279 diag::err_multiple_base_initialization)
5280 << QualType(BaseClass, 0)
5281 << Init->getSourceRange();
5282 }
5283 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer)
5284 << 0 << PrevInit->getSourceRange();
5285
5286 return true;
5287}
5288
5289typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry;
5290typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap;
5291
5292bool CheckRedundantUnionInit(Sema &S,
5293 CXXCtorInitializer *Init,
5294 RedundantUnionMap &Unions) {
5295 FieldDecl *Field = Init->getAnyMember();
5296 RecordDecl *Parent = Field->getParent();
5297 NamedDecl *Child = Field;
5298
5299 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) {
5300 if (Parent->isUnion()) {
5301 UnionEntry &En = Unions[Parent];
5302 if (En.first && En.first != Child) {
5303 S.Diag(Init->getSourceLocation(),
5304 diag::err_multiple_mem_union_initialization)
5305 << Field->getDeclName()
5306 << Init->getSourceRange();
5307 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer)
5308 << 0 << En.second->getSourceRange();
5309 return true;
5310 }
5311 if (!En.first) {
5312 En.first = Child;
5313 En.second = Init;
5314 }
5315 if (!Parent->isAnonymousStructOrUnion())
5316 return false;
5317 }
5318
5319 Child = Parent;
5320 Parent = cast<RecordDecl>(Parent->getDeclContext());
5321 }
5322
5323 return false;
5324}
5325}
5326
5327/// ActOnMemInitializers - Handle the member initializers for a constructor.
5328void Sema::ActOnMemInitializers(Decl *ConstructorDecl,
5329 SourceLocation ColonLoc,
5330 ArrayRef<CXXCtorInitializer*> MemInits,
5331 bool AnyErrors) {
5332 if (!ConstructorDecl)
5333 return;
5334
5335 AdjustDeclIfTemplate(ConstructorDecl);
5336
5337 CXXConstructorDecl *Constructor
5338 = dyn_cast<CXXConstructorDecl>(ConstructorDecl);
5339
5340 if (!Constructor) {
5341 Diag(ColonLoc, diag::err_only_constructors_take_base_inits);
5342 return;
5343 }
5344
5345 // Mapping for the duplicate initializers check.
5346 // For member initializers, this is keyed with a FieldDecl*.
5347 // For base initializers, this is keyed with a Type*.
5348 llvm::DenseMap<const void *, CXXCtorInitializer *> Members;
5349
5350 // Mapping for the inconsistent anonymous-union initializers check.
5351 RedundantUnionMap MemberUnions;
5352
5353 bool HadError = false;
5354 for (unsigned i = 0; i < MemInits.size(); i++) {
5355 CXXCtorInitializer *Init = MemInits[i];
5356
5357 // Set the source order index.
5358 Init->setSourceOrder(i);
5359
5360 if (Init->isAnyMemberInitializer()) {
5361 const void *Key = GetKeyForMember(Context, Init);
5362 if (CheckRedundantInit(*this, Init, Members[Key]) ||
5363 CheckRedundantUnionInit(*this, Init, MemberUnions))
5364 HadError = true;
5365 } else if (Init->isBaseInitializer()) {
5366 const void *Key = GetKeyForMember(Context, Init);
5367 if (CheckRedundantInit(*this, Init, Members[Key]))
5368 HadError = true;
5369 } else {
5370 assert(Init->isDelegatingInitializer())((Init->isDelegatingInitializer()) ? static_cast<void>
(0) : __assert_fail ("Init->isDelegatingInitializer()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 5370, __PRETTY_FUNCTION__))
;
5371 // This must be the only initializer
5372 if (MemInits.size() != 1) {
5373 Diag(Init->getSourceLocation(),
5374 diag::err_delegating_initializer_alone)
5375 << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange();
5376 // We will treat this as being the only initializer.
5377 }
5378 SetDelegatingInitializer(Constructor, MemInits[i]);
5379 // Return immediately as the initializer is set.
5380 return;
5381 }
5382 }
5383
5384 if (HadError)
5385 return;
5386
5387 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits);
5388
5389 SetCtorInitializers(Constructor, AnyErrors, MemInits);
5390
5391 DiagnoseUninitializedFields(*this, Constructor);
5392}
5393
5394void
5395Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location,
5396 CXXRecordDecl *ClassDecl) {
5397 // Ignore dependent contexts. Also ignore unions, since their members never
5398 // have destructors implicitly called.
5399 if (ClassDecl->isDependentContext() || ClassDecl->isUnion())
5400 return;
5401
5402 // FIXME: all the access-control diagnostics are positioned on the
5403 // field/base declaration. That's probably good; that said, the
5404 // user might reasonably want to know why the destructor is being
5405 // emitted, and we currently don't say.
5406
5407 // Non-static data members.
5408 for (auto *Field : ClassDecl->fields()) {
5409 if (Field->isInvalidDecl())
5410 continue;
5411
5412 // Don't destroy incomplete or zero-length arrays.
5413 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType()))
5414 continue;
5415
5416 QualType FieldType = Context.getBaseElementType(Field->getType());
5417
5418 const RecordType* RT = FieldType->getAs<RecordType>();
5419 if (!RT)
5420 continue;
5421
5422 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl());
5423 if (FieldClassDecl->isInvalidDecl())
5424 continue;
5425 if (FieldClassDecl->hasIrrelevantDestructor())
5426 continue;
5427 // The destructor for an implicit anonymous union member is never invoked.
5428 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion())
5429 continue;
5430
5431 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl);
5432 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!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 5432, __PRETTY_FUNCTION__))
;
5433 CheckDestructorAccess(Field->getLocation(), Dtor,
5434 PDiag(diag::err_access_dtor_field)
5435 << Field->getDeclName()
5436 << FieldType);
5437
5438 MarkFunctionReferenced(Location, Dtor);
5439 DiagnoseUseOfDecl(Dtor, Location);
5440 }
5441
5442 // We only potentially invoke the destructors of potentially constructed
5443 // subobjects.
5444 bool VisitVirtualBases = !ClassDecl->isAbstract();
5445
5446 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases;
5447
5448 // Bases.
5449 for (const auto &Base : ClassDecl->bases()) {
5450 // Bases are always records in a well-formed non-dependent class.
5451 const RecordType *RT = Base.getType()->getAs<RecordType>();
5452
5453 // Remember direct virtual bases.
5454 if (Base.isVirtual()) {
5455 if (!VisitVirtualBases)
5456 continue;
5457 DirectVirtualBases.insert(RT);
5458 }
5459
5460 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl());
5461 // If our base class is invalid, we probably can't get its dtor anyway.
5462 if (BaseClassDecl->isInvalidDecl())
5463 continue;
5464 if (BaseClassDecl->hasIrrelevantDestructor())
5465 continue;
5466
5467 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl);
5468 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!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 5468, __PRETTY_FUNCTION__))
;
5469
5470 // FIXME: caret should be on the start of the class name
5471 CheckDestructorAccess(Base.getBeginLoc(), Dtor,
5472 PDiag(diag::err_access_dtor_base)
5473 << Base.getType() << Base.getSourceRange(),
5474 Context.getTypeDeclType(ClassDecl));
5475
5476 MarkFunctionReferenced(Location, Dtor);
5477 DiagnoseUseOfDecl(Dtor, Location);
5478 }
5479
5480 if (!VisitVirtualBases)
5481 return;
5482
5483 // Virtual bases.
5484 for (const auto &VBase : ClassDecl->vbases()) {
5485 // Bases are always records in a well-formed non-dependent class.
5486 const RecordType *RT = VBase.getType()->castAs<RecordType>();
5487
5488 // Ignore direct virtual bases.
5489 if (DirectVirtualBases.count(RT))
5490 continue;
5491
5492 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl());
5493 // If our base class is invalid, we probably can't get its dtor anyway.
5494 if (BaseClassDecl->isInvalidDecl())
5495 continue;
5496 if (BaseClassDecl->hasIrrelevantDestructor())
5497 continue;
5498
5499 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl);
5500 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!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 5500, __PRETTY_FUNCTION__))
;
5501 if (CheckDestructorAccess(
5502 ClassDecl->getLocation(), Dtor,
5503 PDiag(diag::err_access_dtor_vbase)
5504 << Context.getTypeDeclType(ClassDecl) << VBase.getType(),
5505 Context.getTypeDeclType(ClassDecl)) ==
5506 AR_accessible) {
5507 CheckDerivedToBaseConversion(
5508 Context.getTypeDeclType(ClassDecl), VBase.getType(),
5509 diag::err_access_dtor_vbase, 0, ClassDecl->getLocation(),
5510 SourceRange(), DeclarationName(), nullptr);
5511 }
5512
5513 MarkFunctionReferenced(Location, Dtor);
5514 DiagnoseUseOfDecl(Dtor, Location);
5515 }
5516}
5517
5518void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) {
5519 if (!CDtorDecl)
5520 return;
5521
5522 if (CXXConstructorDecl *Constructor
5523 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) {
5524 SetCtorInitializers(Constructor, /*AnyErrors=*/false);
5525 DiagnoseUninitializedFields(*this, Constructor);
5526 }
5527}
5528
5529bool Sema::isAbstractType(SourceLocation Loc, QualType T) {
5530 if (!getLangOpts().CPlusPlus)
5531 return false;
5532
5533 const auto *RD = Context.getBaseElementType(T)->getAsCXXRecordDecl();
5534 if (!RD)
5535 return false;
5536
5537 // FIXME: Per [temp.inst]p1, we are supposed to trigger instantiation of a
5538 // class template specialization here, but doing so breaks a lot of code.
5539
5540 // We can't answer whether something is abstract until it has a
5541 // definition. If it's currently being defined, we'll walk back
5542 // over all the declarations when we have a full definition.
5543 const CXXRecordDecl *Def = RD->getDefinition();
5544 if (!Def || Def->isBeingDefined())
5545 return false;
5546
5547 return RD->isAbstract();
5548}
5549
5550bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T,
5551 TypeDiagnoser &Diagnoser) {
5552 if (!isAbstractType(Loc, T))
5553 return false;
5554
5555 T = Context.getBaseElementType(T);
5556 Diagnoser.diagnose(*this, Loc, T);
5557 DiagnoseAbstractType(T->getAsCXXRecordDecl());
5558 return true;
5559}
5560
5561void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) {
5562 // Check if we've already emitted the list of pure virtual functions
5563 // for this class.
5564 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD))
5565 return;
5566
5567 // If the diagnostic is suppressed, don't emit the notes. We're only
5568 // going to emit them once, so try to attach them to a diagnostic we're
5569 // actually going to show.
5570 if (Diags.isLastDiagnosticIgnored())
5571 return;
5572
5573 CXXFinalOverriderMap FinalOverriders;
5574 RD->getFinalOverriders(FinalOverriders);
5575
5576 // Keep a set of seen pure methods so we won't diagnose the same method
5577 // more than once.
5578 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods;
5579
5580 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(),
5581 MEnd = FinalOverriders.end();
5582 M != MEnd;
5583 ++M) {
5584 for (OverridingMethods::iterator SO = M->second.begin(),
5585 SOEnd = M->second.end();
5586 SO != SOEnd; ++SO) {
5587 // C++ [class.abstract]p4:
5588 // A class is abstract if it contains or inherits at least one
5589 // pure virtual function for which the final overrider is pure
5590 // virtual.
5591
5592 //
5593 if (SO->second.size() != 1)
5594 continue;
5595
5596 if (!SO->second.front().Method->isPure())
5597 continue;
5598
5599 if (!SeenPureMethods.insert(SO->second.front().Method).second)
5600 continue;
5601
5602 Diag(SO->second.front().Method->getLocation(),
5603 diag::note_pure_virtual_function)
5604 << SO->second.front().Method->getDeclName() << RD->getDeclName();
5605 }
5606 }
5607
5608 if (!PureVirtualClassDiagSet)
5609 PureVirtualClassDiagSet.reset(new RecordDeclSetTy);
5610 PureVirtualClassDiagSet->insert(RD);
5611}
5612
5613namespace {
5614struct AbstractUsageInfo {
5615 Sema &S;
5616 CXXRecordDecl *Record;
5617 CanQualType AbstractType;
5618 bool Invalid;
5619
5620 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record)
5621 : S(S), Record(Record),
5622 AbstractType(S.Context.getCanonicalType(
5623 S.Context.getTypeDeclType(Record))),
5624 Invalid(false) {}
5625
5626 void DiagnoseAbstractType() {
5627 if (Invalid) return;
5628 S.DiagnoseAbstractType(Record);
5629 Invalid = true;
5630 }
5631
5632 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel);
5633};
5634
5635struct CheckAbstractUsage {
5636 AbstractUsageInfo &Info;
5637 const NamedDecl *Ctx;
5638
5639 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx)
5640 : Info(Info), Ctx(Ctx) {}
5641
5642 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) {
5643 switch (TL.getTypeLocClass()) {
5644#define ABSTRACT_TYPELOC(CLASS, PARENT)
5645#define TYPELOC(CLASS, PARENT) \
5646 case TypeLoc::CLASS: Check(TL.castAs<CLASS##TypeLoc>(), Sel); break;
5647#include "clang/AST/TypeLocNodes.def"
5648 }
5649 }
5650
5651 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) {
5652 Visit(TL.getReturnLoc(), Sema::AbstractReturnType);
5653 for (unsigned I = 0, E = TL.getNumParams(); I != E; ++I) {
5654 if (!TL.getParam(I))
5655 continue;
5656
5657 TypeSourceInfo *TSI = TL.getParam(I)->getTypeSourceInfo();
5658 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType);
5659 }
5660 }
5661
5662 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) {
5663 Visit(TL.getElementLoc(), Sema::AbstractArrayType);
5664 }
5665
5666 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) {
5667 // Visit the type parameters from a permissive context.
5668 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) {
5669 TemplateArgumentLoc TAL = TL.getArgLoc(I);
5670 if (TAL.getArgument().getKind() == TemplateArgument::Type)
5671 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo())
5672 Visit(TSI->getTypeLoc(), Sema::AbstractNone);
5673 // TODO: other template argument types?
5674 }
5675 }
5676
5677 // Visit pointee types from a permissive context.
5678#define CheckPolymorphic(Type)void Check(Type TL, Sema::AbstractDiagSelID Sel) { Visit(TL.getNextTypeLoc
(), Sema::AbstractNone); }
\
5679 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \
5680 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \
5681 }
5682 CheckPolymorphic(PointerTypeLoc)void Check(PointerTypeLoc TL, Sema::AbstractDiagSelID Sel) { Visit
(TL.getNextTypeLoc(), Sema::AbstractNone); }
5683 CheckPolymorphic(ReferenceTypeLoc)void Check(ReferenceTypeLoc TL, Sema::AbstractDiagSelID Sel) {
Visit(TL.getNextTypeLoc(), Sema::AbstractNone); }
5684 CheckPolymorphic(MemberPointerTypeLoc)void Check(MemberPointerTypeLoc TL, Sema::AbstractDiagSelID Sel
) { Visit(TL.getNextTypeLoc(), Sema::AbstractNone); }
5685 CheckPolymorphic(BlockPointerTypeLoc)void Check(BlockPointerTypeLoc TL, Sema::AbstractDiagSelID Sel
) { Visit(TL.getNextTypeLoc(), Sema::AbstractNone); }
5686 CheckPolymorphic(AtomicTypeLoc)void Check(AtomicTypeLoc TL, Sema::AbstractDiagSelID Sel) { Visit
(TL.getNextTypeLoc(), Sema::AbstractNone); }
5687
5688 /// Handle all the types we haven't given a more specific
5689 /// implementation for above.
5690 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) {
5691 // Every other kind of type that we haven't called out already
5692 // that has an inner type is either (1) sugar or (2) contains that
5693 // inner type in some way as a subobject.
5694 if (TypeLoc Next = TL.getNextTypeLoc())
5695 return Visit(Next, Sel);
5696
5697 // If there's no inner type and we're in a permissive context,
5698 // don't diagnose.
5699 if (Sel == Sema::AbstractNone) return;
5700
5701 // Check whether the type matches the abstract type.
5702 QualType T = TL.getType();
5703 if (T->isArrayType()) {
5704 Sel = Sema::AbstractArrayType;
5705 T = Info.S.Context.getBaseElementType(T);
5706 }
5707 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType();
5708 if (CT != Info.AbstractType) return;
5709
5710 // It matched; do some magic.
5711 if (Sel == Sema::AbstractArrayType) {
5712 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type)
5713 << T << TL.getSourceRange();
5714 } else {
5715 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl)
5716 << Sel << T << TL.getSourceRange();
5717 }
5718 Info.DiagnoseAbstractType();
5719 }
5720};
5721
5722void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL,
5723 Sema::AbstractDiagSelID Sel) {
5724 CheckAbstractUsage(*this, D).Visit(TL, Sel);
5725}
5726
5727}
5728
5729/// Check for invalid uses of an abstract type in a method declaration.
5730static void CheckAbstractClassUsage(AbstractUsageInfo &Info,
5731 CXXMethodDecl *MD) {
5732 // No need to do the check on definitions, which require that
5733 // the return/param types be complete.
5734 if (MD->doesThisDeclarationHaveABody())
5735 return;
5736
5737 // For safety's sake, just ignore it if we don't have type source
5738 // information. This should never happen for non-implicit methods,
5739 // but...
5740 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo())
5741 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone);
5742}
5743
5744/// Check for invalid uses of an abstract type within a class definition.
5745static void CheckAbstractClassUsage(AbstractUsageInfo &Info,
5746 CXXRecordDecl *RD) {
5747 for (auto *D : RD->decls()) {
5748 if (D->isImplicit()) continue;
5749
5750 // Methods and method templates.
5751 if (isa<CXXMethodDecl>(D)) {
5752 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D));
5753 } else if (isa<FunctionTemplateDecl>(D)) {
5754 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl();
5755 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD));
5756
5757 // Fields and static variables.
5758 } else if (isa<FieldDecl>(D)) {
5759 FieldDecl *FD = cast<FieldDecl>(D);
5760 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo())
5761 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType);
5762 } else if (isa<VarDecl>(D)) {
5763 VarDecl *VD = cast<VarDecl>(D);
5764 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo())
5765 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType);
5766
5767 // Nested classes and class templates.
5768 } else if (isa<CXXRecordDecl>(D)) {
5769 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D));
5770 } else if (isa<ClassTemplateDecl>(D)) {
5771 CheckAbstractClassUsage(Info,
5772 cast<ClassTemplateDecl>(D)->getTemplatedDecl());
5773 }
5774 }
5775}
5776
5777static void ReferenceDllExportedMembers(Sema &S, CXXRecordDecl *Class) {
5778 Attr *ClassAttr = getDLLAttr(Class);
5779 if (!ClassAttr)
5780 return;
5781
5782 assert(ClassAttr->getKind() == attr::DLLExport)((ClassAttr->getKind() == attr::DLLExport) ? static_cast<
void> (0) : __assert_fail ("ClassAttr->getKind() == attr::DLLExport"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 5782, __PRETTY_FUNCTION__))
;
5783
5784 TemplateSpecializationKind TSK = Class->getTemplateSpecializationKind();
5785
5786 if (TSK == TSK_ExplicitInstantiationDeclaration)
5787 // Don't go any further if this is just an explicit instantiation
5788 // declaration.
5789 return;
5790
5791 if (S.Context.getTargetInfo().getTriple().isWindowsGNUEnvironment())
5792 S.MarkVTableUsed(Class->getLocation(), Class, true);
5793
5794 for (Decl *Member : Class->decls()) {
5795 // Defined static variables that are members of an exported base
5796 // class must be marked export too.
5797 auto *VD = dyn_cast<VarDecl>(Member);
5798 if (VD && Member->getAttr<DLLExportAttr>() &&
5799 VD->getStorageClass() == SC_Static &&
5800 TSK == TSK_ImplicitInstantiation)
5801 S.MarkVariableReferenced(VD->getLocation(), VD);
5802
5803 auto *MD = dyn_cast<CXXMethodDecl>(Member);
5804 if (!MD)
5805 continue;
5806
5807 if (Member->getAttr<DLLExportAttr>()) {
5808 if (MD->isUserProvided()) {
5809 // Instantiate non-default class member functions ...
5810
5811 // .. except for certain kinds of template specializations.
5812 if (TSK == TSK_ImplicitInstantiation && !ClassAttr->isInherited())
5813 continue;
5814
5815 S.MarkFunctionReferenced(Class->getLocation(), MD);
5816
5817 // The function will be passed to the consumer when its definition is
5818 // encountered.
5819 } else if (!MD->isTrivial() || MD->isExplicitlyDefaulted() ||
5820 MD->isCopyAssignmentOperator() ||
5821 MD->isMoveAssignmentOperator()) {
5822 // Synthesize and instantiate non-trivial implicit methods, explicitly
5823 // defaulted methods, and the copy and move assignment operators. The
5824 // latter are exported even if they are trivial, because the address of
5825 // an operator can be taken and should compare equal across libraries.
5826 DiagnosticErrorTrap Trap(S.Diags);
5827 S.MarkFunctionReferenced(Class->getLocation(), MD);
5828 if (Trap.hasErrorOccurred()) {
5829 S.Diag(ClassAttr->getLocation(), diag::note_due_to_dllexported_class)
5830 << Class << !S.getLangOpts().CPlusPlus11;
5831 break;
5832 }
5833
5834 // There is no later point when we will see the definition of this
5835 // function, so pass it to the consumer now.
5836 S.Consumer.HandleTopLevelDecl(DeclGroupRef(MD));
5837 }
5838 }
5839 }
5840}
5841
5842static void checkForMultipleExportedDefaultConstructors(Sema &S,
5843 CXXRecordDecl *Class) {
5844 // Only the MS ABI has default constructor closures, so we don't need to do
5845 // this semantic checking anywhere else.
5846 if (!S.Context.getTargetInfo().getCXXABI().isMicrosoft())
5847 return;
5848
5849 CXXConstructorDecl *LastExportedDefaultCtor = nullptr;
5850 for (Decl *Member : Class->decls()) {
5851 // Look for exported default constructors.
5852 auto *CD = dyn_cast<CXXConstructorDecl>(Member);
5853 if (!CD || !CD->isDefaultConstructor())
5854 continue;
5855 auto *Attr = CD->getAttr<DLLExportAttr>();
5856 if (!Attr)
5857 continue;
5858
5859 // If the class is non-dependent, mark the default arguments as ODR-used so
5860 // that we can properly codegen the constructor closure.
5861 if (!Class->isDependentContext()) {
5862 for (ParmVarDecl *PD : CD->parameters()) {
5863 (void)S.CheckCXXDefaultArgExpr(Attr->getLocation(), CD, PD);
5864 S.DiscardCleanupsInEvaluationContext();
5865 }
5866 }
5867
5868 if (LastExportedDefaultCtor) {
5869 S.Diag(LastExportedDefaultCtor->getLocation(),
5870 diag::err_attribute_dll_ambiguous_default_ctor)
5871 << Class;
5872 S.Diag(CD->getLocation(), diag::note_entity_declared_at)
5873 << CD->getDeclName();
5874 return;
5875 }
5876 LastExportedDefaultCtor = CD;
5877 }
5878}
5879
5880void Sema::checkClassLevelCodeSegAttribute(CXXRecordDecl *Class) {
5881 // Mark any compiler-generated routines with the implicit code_seg attribute.
5882 for (auto *Method : Class->methods()) {
5883 if (Method->isUserProvided())
5884 continue;
5885 if (Attr *A = getImplicitCodeSegOrSectionAttrForFunction(Method, /*IsDefinition=*/true))
5886 Method->addAttr(A);
5887 }
5888}
5889
5890/// Check class-level dllimport/dllexport attribute.
5891void Sema::checkClassLevelDLLAttribute(CXXRecordDecl *Class) {
5892 Attr *ClassAttr = getDLLAttr(Class);
5893
5894 // MSVC inherits DLL attributes to partial class template specializations.
5895 if (Context.getTargetInfo().getCXXABI().isMicrosoft() && !ClassAttr) {
5896 if (auto *Spec = dyn_cast<ClassTemplatePartialSpecializationDecl>(Class)) {
5897 if (Attr *TemplateAttr =
5898 getDLLAttr(Spec->getSpecializedTemplate()->getTemplatedDecl())) {
5899 auto *A = cast<InheritableAttr>(TemplateAttr->clone(getASTContext()));
5900 A->setInherited(true);
5901 ClassAttr = A;
5902 }
5903 }
5904 }
5905
5906 if (!ClassAttr)
5907 return;
5908
5909 if (!Class->isExternallyVisible()) {
5910 Diag(Class->getLocation(), diag::err_attribute_dll_not_extern)
5911 << Class << ClassAttr;
5912 return;
5913 }
5914
5915 if (Context.getTargetInfo().getCXXABI().isMicrosoft() &&
5916 !ClassAttr->isInherited()) {
5917 // Diagnose dll attributes on members of class with dll attribute.
5918 for (Decl *Member : Class->decls()) {
5919 if (!isa<VarDecl>(Member) && !isa<CXXMethodDecl>(Member))
5920 continue;
5921 InheritableAttr *MemberAttr = getDLLAttr(Member);
5922 if (!MemberAttr || MemberAttr->isInherited() || Member->isInvalidDecl())
5923 continue;
5924
5925 Diag(MemberAttr->getLocation(),
5926 diag::err_attribute_dll_member_of_dll_class)
5927 << MemberAttr << ClassAttr;
5928 Diag(ClassAttr->getLocation(), diag::note_previous_attribute);
5929 Member->setInvalidDecl();
5930 }
5931 }
5932
5933 if (Class->getDescribedClassTemplate())
5934 // Don't inherit dll attribute until the template is instantiated.
5935 return;
5936
5937 // The class is either imported or exported.
5938 const bool ClassExported = ClassAttr->getKind() == attr::DLLExport;
5939
5940 // Check if this was a dllimport attribute propagated from a derived class to
5941 // a base class template specialization. We don't apply these attributes to
5942 // static data members.
5943 const bool PropagatedImport =
5944 !ClassExported &&
5945 cast<DLLImportAttr>(ClassAttr)->wasPropagatedToBaseTemplate();
5946
5947 TemplateSpecializationKind TSK = Class->getTemplateSpecializationKind();
5948
5949 // Ignore explicit dllexport on explicit class template instantiation
5950 // declarations, except in MinGW mode.
5951 if (ClassExported && !ClassAttr->isInherited() &&
5952 TSK == TSK_ExplicitInstantiationDeclaration &&
5953 !Context.getTargetInfo().getTriple().isWindowsGNUEnvironment()) {
5954 Class->dropAttr<DLLExportAttr>();
5955 return;
5956 }
5957
5958 // Force declaration of implicit members so they can inherit the attribute.
5959 ForceDeclarationOfImplicitMembers(Class);
5960
5961 // FIXME: MSVC's docs say all bases must be exportable, but this doesn't
5962 // seem to be true in practice?
5963
5964 for (Decl *Member : Class->decls()) {
5965 VarDecl *VD = dyn_cast<VarDecl>(Member);
5966 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member);
5967
5968 // Only methods and static fields inherit the attributes.
5969 if (!VD && !MD)
5970 continue;
5971
5972 if (MD) {
5973 // Don't process deleted methods.
5974 if (MD->isDeleted())
5975 continue;
5976
5977 if (MD->isInlined()) {
5978 // MinGW does not import or export inline methods. But do it for
5979 // template instantiations.
5980 if (!Context.getTargetInfo().getCXXABI().isMicrosoft() &&
5981 !Context.getTargetInfo().getTriple().isWindowsItaniumEnvironment() &&
5982 TSK != TSK_ExplicitInstantiationDeclaration &&
5983 TSK != TSK_ExplicitInstantiationDefinition)
5984 continue;
5985
5986 // MSVC versions before 2015 don't export the move assignment operators
5987 // and move constructor, so don't attempt to import/export them if
5988 // we have a definition.
5989 auto *Ctor = dyn_cast<CXXConstructorDecl>(MD);
5990 if ((MD->isMoveAssignmentOperator() ||
5991 (Ctor && Ctor->isMoveConstructor())) &&
5992 !getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015))
5993 continue;
5994
5995 // MSVC2015 doesn't export trivial defaulted x-tor but copy assign
5996 // operator is exported anyway.
5997 if (getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015) &&
5998 (Ctor || isa<CXXDestructorDecl>(MD)) && MD->isTrivial())
5999 continue;
6000 }
6001 }
6002
6003 // Don't apply dllimport attributes to static data members of class template
6004 // instantiations when the attribute is propagated from a derived class.
6005 if (VD && PropagatedImport)
6006 continue;
6007
6008 if (!cast<NamedDecl>(Member)->isExternallyVisible())
6009 continue;
6010
6011 if (!getDLLAttr(Member)) {
6012 InheritableAttr *NewAttr = nullptr;
6013
6014 // Do not export/import inline function when -fno-dllexport-inlines is
6015 // passed. But add attribute for later local static var check.
6016 if (!getLangOpts().DllExportInlines && MD && MD->isInlined() &&
6017 TSK != TSK_ExplicitInstantiationDeclaration &&
6018 TSK != TSK_ExplicitInstantiationDefinition) {
6019 if (ClassExported) {
6020 NewAttr = ::new (getASTContext())
6021 DLLExportStaticLocalAttr(getASTContext(), *ClassAttr);
6022 } else {
6023 NewAttr = ::new (getASTContext())
6024 DLLImportStaticLocalAttr(getASTContext(), *ClassAttr);
6025 }
6026 } else {
6027 NewAttr = cast<InheritableAttr>(ClassAttr->clone(getASTContext()));
6028 }
6029
6030 NewAttr->setInherited(true);
6031 Member->addAttr(NewAttr);
6032
6033 if (MD) {
6034 // Propagate DLLAttr to friend re-declarations of MD that have already
6035 // been constructed.
6036 for (FunctionDecl *FD = MD->getMostRecentDecl(); FD;
6037 FD = FD->getPreviousDecl()) {
6038 if (FD->getFriendObjectKind() == Decl::FOK_None)
6039 continue;
6040 assert(!getDLLAttr(FD) &&((!getDLLAttr(FD) && "friend re-decl should not already have a DLLAttr"
) ? static_cast<void> (0) : __assert_fail ("!getDLLAttr(FD) && \"friend re-decl should not already have a DLLAttr\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 6041, __PRETTY_FUNCTION__))
6041 "friend re-decl should not already have a DLLAttr")((!getDLLAttr(FD) && "friend re-decl should not already have a DLLAttr"
) ? static_cast<void> (0) : __assert_fail ("!getDLLAttr(FD) && \"friend re-decl should not already have a DLLAttr\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 6041, __PRETTY_FUNCTION__))
;
6042 NewAttr = cast<InheritableAttr>(ClassAttr->clone(getASTContext()));
6043 NewAttr->setInherited(true);
6044 FD->addAttr(NewAttr);
6045 }
6046 }
6047 }
6048 }
6049
6050 if (ClassExported)
6051 DelayedDllExportClasses.push_back(Class);
6052}
6053
6054/// Perform propagation of DLL attributes from a derived class to a
6055/// templated base class for MS compatibility.
6056void Sema::propagateDLLAttrToBaseClassTemplate(
6057 CXXRecordDecl *Class, Attr *ClassAttr,
6058 ClassTemplateSpecializationDecl *BaseTemplateSpec, SourceLocation BaseLoc) {
6059 if (getDLLAttr(
6060 BaseTemplateSpec->getSpecializedTemplate()->getTemplatedDecl())) {
6061 // If the base class template has a DLL attribute, don't try to change it.
6062 return;
6063 }
6064
6065 auto TSK = BaseTemplateSpec->getSpecializationKind();
6066 if (!getDLLAttr(BaseTemplateSpec) &&
6067 (TSK == TSK_Undeclared || TSK == TSK_ExplicitInstantiationDeclaration ||
6068 TSK == TSK_ImplicitInstantiation)) {
6069 // The template hasn't been instantiated yet (or it has, but only as an
6070 // explicit instantiation declaration or implicit instantiation, which means
6071 // we haven't codegenned any members yet), so propagate the attribute.
6072 auto *NewAttr = cast<InheritableAttr>(ClassAttr->clone(getASTContext()));
6073 NewAttr->setInherited(true);
6074 BaseTemplateSpec->addAttr(NewAttr);
6075
6076 // If this was an import, mark that we propagated it from a derived class to
6077 // a base class template specialization.
6078 if (auto *ImportAttr = dyn_cast<DLLImportAttr>(NewAttr))
6079 ImportAttr->setPropagatedToBaseTemplate();
6080
6081 // If the template is already instantiated, checkDLLAttributeRedeclaration()
6082 // needs to be run again to work see the new attribute. Otherwise this will
6083 // get run whenever the template is instantiated.
6084 if (TSK != TSK_Undeclared)
6085 checkClassLevelDLLAttribute(BaseTemplateSpec);
6086
6087 return;
6088 }
6089
6090 if (getDLLAttr(BaseTemplateSpec)) {
6091 // The template has already been specialized or instantiated with an
6092 // attribute, explicitly or through propagation. We should not try to change
6093 // it.
6094 return;
6095 }
6096
6097 // The template was previously instantiated or explicitly specialized without
6098 // a dll attribute, It's too late for us to add an attribute, so warn that
6099 // this is unsupported.
6100 Diag(BaseLoc, diag::warn_attribute_dll_instantiated_base_class)
6101 << BaseTemplateSpec->isExplicitSpecialization();
6102 Diag(ClassAttr->getLocation(), diag::note_attribute);
6103 if (BaseTemplateSpec->isExplicitSpecialization()) {
6104 Diag(BaseTemplateSpec->getLocation(),
6105 diag::note_template_class_explicit_specialization_was_here)
6106 << BaseTemplateSpec;
6107 } else {
6108 Diag(BaseTemplateSpec->getPointOfInstantiation(),
6109 diag::note_template_class_instantiation_was_here)
6110 << BaseTemplateSpec;
6111 }
6112}
6113
6114/// Determine the kind of defaulting that would be done for a given function.
6115///
6116/// If the function is both a default constructor and a copy / move constructor
6117/// (due to having a default argument for the first parameter), this picks
6118/// CXXDefaultConstructor.
6119///
6120/// FIXME: Check that case is properly handled by all callers.
6121Sema::DefaultedFunctionKind
6122Sema::getDefaultedFunctionKind(const FunctionDecl *FD) {
6123 if (auto *MD = dyn_cast<CXXMethodDecl>(FD)) {
6124 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(FD)) {
6125 if (Ctor->isDefaultConstructor())
6126 return Sema::CXXDefaultConstructor;
6127
6128 if (Ctor->isCopyConstructor())
6129 return Sema::CXXCopyConstructor;
6130
6131 if (Ctor->isMoveConstructor())
6132 return Sema::CXXMoveConstructor;
6133 }
6134
6135 if (MD->isCopyAssignmentOperator())
6136 return Sema::CXXCopyAssignment;
6137
6138 if (MD->isMoveAssignmentOperator())
6139 return Sema::CXXMoveAssignment;
6140
6141 if (isa<CXXDestructorDecl>(FD))
6142 return Sema::CXXDestructor;
6143 }
6144
6145 switch (FD->getDeclName().getCXXOverloadedOperator()) {
6146 case OO_EqualEqual:
6147 return DefaultedComparisonKind::Equal;
6148
6149 case OO_ExclaimEqual:
6150 return DefaultedComparisonKind::NotEqual;
6151
6152 case OO_Spaceship:
6153 // No point allowing this if <=> doesn't exist in the current language mode.
6154 if (!getLangOpts().CPlusPlus2a)
6155 break;
6156 return DefaultedComparisonKind::ThreeWay;
6157
6158 case OO_Less:
6159 case OO_LessEqual:
6160 case OO_Greater:
6161 case OO_GreaterEqual:
6162 // No point allowing this if <=> doesn't exist in the current language mode.
6163 if (!getLangOpts().CPlusPlus2a)
6164 break;
6165 return DefaultedComparisonKind::Relational;
6166
6167 default:
6168 break;
6169 }
6170
6171 // Not defaultable.
6172 return DefaultedFunctionKind();
6173}
6174
6175static void DefineImplicitSpecialMember(Sema &S, CXXMethodDecl *MD,
6176 SourceLocation DefaultLoc) {
6177 switch (S.getSpecialMember(MD)) {
6178 case Sema::CXXDefaultConstructor:
6179 S.DefineImplicitDefaultConstructor(DefaultLoc,
6180 cast<CXXConstructorDecl>(MD));
6181 break;
6182 case Sema::CXXCopyConstructor:
6183 S.DefineImplicitCopyConstructor(DefaultLoc, cast<CXXConstructorDecl>(MD));
6184 break;
6185 case Sema::CXXCopyAssignment:
6186 S.DefineImplicitCopyAssignment(DefaultLoc, MD);
6187 break;
6188 case Sema::CXXDestructor:
6189 S.DefineImplicitDestructor(DefaultLoc, cast<CXXDestructorDecl>(MD));
6190 break;
6191 case Sema::CXXMoveConstructor:
6192 S.DefineImplicitMoveConstructor(DefaultLoc, cast<CXXConstructorDecl>(MD));
6193 break;
6194 case Sema::CXXMoveAssignment:
6195 S.DefineImplicitMoveAssignment(DefaultLoc, MD);
6196 break;
6197 case Sema::CXXInvalid:
6198 llvm_unreachable("Invalid special member.")::llvm::llvm_unreachable_internal("Invalid special member.", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 6198)
;
6199 }
6200}
6201
6202/// Determine whether a type is permitted to be passed or returned in
6203/// registers, per C++ [class.temporary]p3.
6204static bool canPassInRegisters(Sema &S, CXXRecordDecl *D,
6205 TargetInfo::CallingConvKind CCK) {
6206 if (D->isDependentType() || D->isInvalidDecl())
6207 return false;
6208
6209 // Clang <= 4 used the pre-C++11 rule, which ignores move operations.
6210 // The PS4 platform ABI follows the behavior of Clang 3.2.
6211 if (CCK == TargetInfo::CCK_ClangABI4OrPS4)
6212 return !D->hasNonTrivialDestructorForCall() &&
6213 !D->hasNonTrivialCopyConstructorForCall();
6214
6215 if (CCK == TargetInfo::CCK_MicrosoftWin64) {
6216 bool CopyCtorIsTrivial = false, CopyCtorIsTrivialForCall = false;
6217 bool DtorIsTrivialForCall = false;
6218
6219 // If a class has at least one non-deleted, trivial copy constructor, it
6220 // is passed according to the C ABI. Otherwise, it is passed indirectly.
6221 //
6222 // Note: This permits classes with non-trivial copy or move ctors to be
6223 // passed in registers, so long as they *also* have a trivial copy ctor,
6224 // which is non-conforming.
6225 if (D->needsImplicitCopyConstructor()) {
6226 if (!D->defaultedCopyConstructorIsDeleted()) {
6227 if (D->hasTrivialCopyConstructor())
6228 CopyCtorIsTrivial = true;
6229 if (D->hasTrivialCopyConstructorForCall())
6230 CopyCtorIsTrivialForCall = true;
6231 }
6232 } else {
6233 for (const CXXConstructorDecl *CD : D->ctors()) {
6234 if (CD->isCopyConstructor() && !CD->isDeleted()) {
6235 if (CD->isTrivial())
6236 CopyCtorIsTrivial = true;
6237 if (CD->isTrivialForCall())
6238 CopyCtorIsTrivialForCall = true;
6239 }
6240 }
6241 }
6242
6243 if (D->needsImplicitDestructor()) {
6244 if (!D->defaultedDestructorIsDeleted() &&
6245 D->hasTrivialDestructorForCall())
6246 DtorIsTrivialForCall = true;
6247 } else if (const auto *DD = D->getDestructor()) {
6248 if (!DD->isDeleted() && DD->isTrivialForCall())
6249 DtorIsTrivialForCall = true;
6250 }
6251
6252 // If the copy ctor and dtor are both trivial-for-calls, pass direct.
6253 if (CopyCtorIsTrivialForCall && DtorIsTrivialForCall)
6254 return true;
6255
6256 // If a class has a destructor, we'd really like to pass it indirectly
6257 // because it allows us to elide copies. Unfortunately, MSVC makes that
6258 // impossible for small types, which it will pass in a single register or
6259 // stack slot. Most objects with dtors are large-ish, so handle that early.
6260 // We can't call out all large objects as being indirect because there are
6261 // multiple x64 calling conventions and the C++ ABI code shouldn't dictate
6262 // how we pass large POD types.
6263
6264 // Note: This permits small classes with nontrivial destructors to be
6265 // passed in registers, which is non-conforming.
6266 bool isAArch64 = S.Context.getTargetInfo().getTriple().isAArch64();
6267 uint64_t TypeSize = isAArch64 ? 128 : 64;
6268
6269 if (CopyCtorIsTrivial &&
6270 S.getASTContext().getTypeSize(D->getTypeForDecl()) <= TypeSize)
6271 return true;
6272 return false;
6273 }
6274
6275 // Per C++ [class.temporary]p3, the relevant condition is:
6276 // each copy constructor, move constructor, and destructor of X is
6277 // either trivial or deleted, and X has at least one non-deleted copy
6278 // or move constructor
6279 bool HasNonDeletedCopyOrMove = false;
6280
6281 if (D->needsImplicitCopyConstructor() &&
6282 !D->defaultedCopyConstructorIsDeleted()) {
6283 if (!D->hasTrivialCopyConstructorForCall())
6284 return false;
6285 HasNonDeletedCopyOrMove = true;
6286 }
6287
6288 if (S.getLangOpts().CPlusPlus11 && D->needsImplicitMoveConstructor() &&
6289 !D->defaultedMoveConstructorIsDeleted()) {
6290 if (!D->hasTrivialMoveConstructorForCall())
6291 return false;
6292 HasNonDeletedCopyOrMove = true;
6293 }
6294
6295 if (D->needsImplicitDestructor() && !D->defaultedDestructorIsDeleted() &&
6296 !D->hasTrivialDestructorForCall())
6297 return false;
6298
6299 for (const CXXMethodDecl *MD : D->methods()) {
6300 if (MD->isDeleted())
6301 continue;
6302
6303 auto *CD = dyn_cast<CXXConstructorDecl>(MD);
6304 if (CD && CD->isCopyOrMoveConstructor())
6305 HasNonDeletedCopyOrMove = true;
6306 else if (!isa<CXXDestructorDecl>(MD))
6307 continue;
6308
6309 if (!MD->isTrivialForCall())
6310 return false;
6311 }
6312
6313 return HasNonDeletedCopyOrMove;
6314}
6315
6316/// Perform semantic checks on a class definition that has been
6317/// completing, introducing implicitly-declared members, checking for
6318/// abstract types, etc.
6319///
6320/// \param S The scope in which the class was parsed. Null if we didn't just
6321/// parse a class definition.
6322/// \param Record The completed class.
6323void Sema::CheckCompletedCXXClass(Scope *S, CXXRecordDecl *Record) {
6324 if (!Record)
6325 return;
6326
6327 if (Record->isAbstract() && !Record->isInvalidDecl()) {
6328 AbstractUsageInfo Info(*this, Record);
6329 CheckAbstractClassUsage(Info, Record);
6330 }
6331
6332 // If this is not an aggregate type and has no user-declared constructor,
6333 // complain about any non-static data members of reference or const scalar
6334 // type, since they will never get initializers.
6335 if (!Record->isInvalidDecl() && !Record->isDependentType() &&
6336 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() &&
6337 !Record->isLambda()) {
6338 bool Complained = false;
6339 for (const auto *F : Record->fields()) {
6340 if (F->hasInClassInitializer() || F->isUnnamedBitfield())
6341 continue;
6342
6343 if (F->getType()->isReferenceType() ||
6344 (F->getType().isConstQualified() && F->getType()->isScalarType())) {
6345 if (!Complained) {
6346 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst)
6347 << Record->getTagKind() << Record;
6348 Complained = true;
6349 }
6350
6351 Diag(F->getLocation(), diag::note_refconst_member_not_initialized)
6352 << F->getType()->isReferenceType()
6353 << F->getDeclName();
6354 }
6355 }
6356 }
6357
6358 if (Record->getIdentifier()) {
6359 // C++ [class.mem]p13:
6360 // If T is the name of a class, then each of the following shall have a
6361 // name different from T:
6362 // - every member of every anonymous union that is a member of class T.
6363 //
6364 // C++ [class.mem]p14:
6365 // In addition, if class T has a user-declared constructor (12.1), every
6366 // non-static data member of class T shall have a name different from T.
6367 DeclContext::lookup_result R = Record->lookup(Record->getDeclName());
6368 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E;
6369 ++I) {
6370 NamedDecl *D = (*I)->getUnderlyingDecl();
6371 if (((isa<FieldDecl>(D) || isa<UnresolvedUsingValueDecl>(D)) &&
6372 Record->hasUserDeclaredConstructor()) ||
6373 isa<IndirectFieldDecl>(D)) {
6374 Diag((*I)->getLocation(), diag::err_member_name_of_class)
6375 << D->getDeclName();
6376 break;
6377 }
6378 }
6379 }
6380
6381 // Warn if the class has virtual methods but non-virtual public destructor.
6382 if (Record->isPolymorphic() && !Record->isDependentType()) {
6383 CXXDestructorDecl *dtor = Record->getDestructor();
6384 if ((!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) &&
6385 !Record->hasAttr<FinalAttr>())
6386 Diag(dtor ? dtor->getLocation() : Record->getLocation(),
6387 diag::warn_non_virtual_dtor) << Context.getRecordType(Record);
6388 }
6389
6390 if (Record->isAbstract()) {
6391 if (FinalAttr *FA = Record->getAttr<FinalAttr>()) {
6392 Diag(Record->getLocation(), diag::warn_abstract_final_class)
6393 << FA->isSpelledAsSealed();
6394 DiagnoseAbstractType(Record);
6395 }
6396 }
6397
6398 // Warn if the class has a final destructor but is not itself marked final.
6399 if (!Record->hasAttr<FinalAttr>()) {
6400 if (const CXXDestructorDecl *dtor = Record->getDestructor()) {
6401 if (const FinalAttr *FA = dtor->getAttr<FinalAttr>()) {
6402 Diag(FA->getLocation(), diag::warn_final_dtor_non_final_class)
6403 << FA->isSpelledAsSealed()
6404 << FixItHint::CreateInsertion(
6405 getLocForEndOfToken(Record->getLocation()),
6406 (FA->isSpelledAsSealed() ? " sealed" : " final"));
6407 Diag(Record->getLocation(),
6408 diag::note_final_dtor_non_final_class_silence)
6409 << Context.getRecordType(Record) << FA->isSpelledAsSealed();
6410 }
6411 }
6412 }
6413
6414 // See if trivial_abi has to be dropped.
6415 if (Record->hasAttr<TrivialABIAttr>())
6416 checkIllFormedTrivialABIStruct(*Record);
6417
6418 // Set HasTrivialSpecialMemberForCall if the record has attribute
6419 // "trivial_abi".
6420 bool HasTrivialABI = Record->hasAttr<TrivialABIAttr>();
6421
6422 if (HasTrivialABI)
6423 Record->setHasTrivialSpecialMemberForCall();
6424
6425 // Explicitly-defaulted secondary comparison functions (!=, <, <=, >, >=).
6426 // We check these last because they can depend on the properties of the
6427 // primary comparison functions (==, <=>).
6428 llvm::SmallVector<FunctionDecl*, 5> DefaultedSecondaryComparisons;
6429
6430 auto CheckForDefaultedFunction = [&](FunctionDecl *FD) {
6431 if (!FD || FD->isInvalidDecl() || !FD->isExplicitlyDefaulted())
6432 return;
6433
6434 DefaultedFunctionKind DFK = getDefaultedFunctionKind(FD);
6435 if (DFK.asComparison() == DefaultedComparisonKind::NotEqual ||
6436 DFK.asComparison() == DefaultedComparisonKind::Relational)
6437 DefaultedSecondaryComparisons.push_back(FD);
6438 else
6439 CheckExplicitlyDefaultedFunction(S, FD);
6440 };
6441
6442 auto CompleteMemberFunction = [&](CXXMethodDecl *M) {
6443 // Check whether the explicitly-defaulted members are valid.
6444 CheckForDefaultedFunction(M);
6445
6446 // Skip the rest of the checks for a member of a dependent class.
6447 if (Record->isDependentType())
6448 return;
6449
6450 // For an explicitly defaulted or deleted special member, we defer
6451 // determining triviality until the class is complete. That time is now!
6452 CXXSpecialMember CSM = getSpecialMember(M);
6453 if (!M->isImplicit() && !M->isUserProvided()) {
6454 if (CSM != CXXInvalid) {
6455 M->setTrivial(SpecialMemberIsTrivial(M, CSM));
6456 // Inform the class that we've finished declaring this member.
6457 Record->finishedDefaultedOrDeletedMember(M);
6458 M->setTrivialForCall(
6459 HasTrivialABI ||
6460 SpecialMemberIsTrivial(M, CSM, TAH_ConsiderTrivialABI));
6461 Record->setTrivialForCallFlags(M);
6462 }
6463 }
6464
6465 // Set triviality for the purpose of calls if this is a user-provided
6466 // copy/move constructor or destructor.
6467 if ((CSM == CXXCopyConstructor || CSM == CXXMoveConstructor ||
6468 CSM == CXXDestructor) && M->isUserProvided()) {
6469 M->setTrivialForCall(HasTrivialABI);
6470 Record->setTrivialForCallFlags(M);
6471 }
6472
6473 if (!M->isInvalidDecl() && M->isExplicitlyDefaulted() &&
6474 M->hasAttr<DLLExportAttr>()) {
6475 if (getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015) &&
6476 M->isTrivial() &&
6477 (CSM == CXXDefaultConstructor || CSM == CXXCopyConstructor ||
6478 CSM == CXXDestructor))
6479 M->dropAttr<DLLExportAttr>();
6480
6481 if (M->hasAttr<DLLExportAttr>()) {
6482 // Define after any fields with in-class initializers have been parsed.
6483 DelayedDllExportMemberFunctions.push_back(M);
6484 }
6485 }
6486
6487 // Define defaulted constexpr virtual functions that override a base class
6488 // function right away.
6489 // FIXME: We can defer doing this until the vtable is marked as used.
6490 if (M->isDefaulted() && M->isConstexpr() && M->size_overridden_methods())
6491 DefineImplicitSpecialMember(*this, M, M->getLocation());
6492 };
6493
6494 // Check the destructor before any other member function. We need to
6495 // determine whether it's trivial in order to determine whether the claas
6496 // type is a literal type, which is a prerequisite for determining whether
6497 // other special member functions are valid and whether they're implicitly
6498 // 'constexpr'.
6499 if (CXXDestructorDecl *Dtor = Record->getDestructor())
6500 CompleteMemberFunction(Dtor);
6501
6502 bool HasMethodWithOverrideControl = false,
6503 HasOverridingMethodWithoutOverrideControl = false;
6504 for (auto *D : Record->decls()) {
6505 if (auto *M = dyn_cast<CXXMethodDecl>(D)) {
6506 // FIXME: We could do this check for dependent types with non-dependent
6507 // bases.
6508 if (!Record->isDependentType()) {
6509 // See if a method overloads virtual methods in a base
6510 // class without overriding any.
6511 if (!M->isStatic())
6512 DiagnoseHiddenVirtualMethods(M);
6513 if (M->hasAttr<OverrideAttr>())
6514 HasMethodWithOverrideControl = true;
6515 else if (M->size_overridden_methods() > 0)
6516 HasOverridingMethodWithoutOverrideControl = true;
6517 }
6518
6519 if (!isa<CXXDestructorDecl>(M))
6520 CompleteMemberFunction(M);
6521 } else if (auto *F = dyn_cast<FriendDecl>(D)) {
6522 CheckForDefaultedFunction(
6523 dyn_cast_or_null<FunctionDecl>(F->getFriendDecl()));
6524 }
6525 }
6526
6527 if (HasMethodWithOverrideControl &&
6528 HasOverridingMethodWithoutOverrideControl) {
6529 // At least one method has the 'override' control declared.
6530 // Diagnose all other overridden methods which do not have 'override'
6531 // specified on them.
6532 for (auto *M : Record->methods())
6533 DiagnoseAbsenceOfOverrideControl(M);
6534 }
6535
6536 // Check the defaulted secondary comparisons after any other member functions.
6537 for (FunctionDecl *FD : DefaultedSecondaryComparisons)
6538 CheckExplicitlyDefaultedFunction(S, FD);
6539
6540 // ms_struct is a request to use the same ABI rules as MSVC. Check
6541 // whether this class uses any C++ features that are implemented
6542 // completely differently in MSVC, and if so, emit a diagnostic.
6543 // That diagnostic defaults to an error, but we allow projects to
6544 // map it down to a warning (or ignore it). It's a fairly common
6545 // practice among users of the ms_struct pragma to mass-annotate
6546 // headers, sweeping up a bunch of types that the project doesn't
6547 // really rely on MSVC-compatible layout for. We must therefore
6548 // support "ms_struct except for C++ stuff" as a secondary ABI.
6549 if (Record->isMsStruct(Context) &&
6550 (Record->isPolymorphic() || Record->getNumBases())) {
6551 Diag(Record->getLocation(), diag::warn_cxx_ms_struct);
6552 }
6553
6554 checkClassLevelDLLAttribute(Record);
6555 checkClassLevelCodeSegAttribute(Record);
6556
6557 bool ClangABICompat4 =
6558 Context.getLangOpts().getClangABICompat() <= LangOptions::ClangABI::Ver4;
6559 TargetInfo::CallingConvKind CCK =
6560 Context.getTargetInfo().getCallingConvKind(ClangABICompat4);
6561 bool CanPass = canPassInRegisters(*this, Record, CCK);
6562
6563 // Do not change ArgPassingRestrictions if it has already been set to
6564 // APK_CanNeverPassInRegs.
6565 if (Record->getArgPassingRestrictions() != RecordDecl::APK_CanNeverPassInRegs)
6566 Record->setArgPassingRestrictions(CanPass
6567 ? RecordDecl::APK_CanPassInRegs
6568 : RecordDecl::APK_CannotPassInRegs);
6569
6570 // If canPassInRegisters returns true despite the record having a non-trivial
6571 // destructor, the record is destructed in the callee. This happens only when
6572 // the record or one of its subobjects has a field annotated with trivial_abi
6573 // or a field qualified with ObjC __strong/__weak.
6574 if (Context.getTargetInfo().getCXXABI().areArgsDestroyedLeftToRightInCallee())
6575 Record->setParamDestroyedInCallee(true);
6576 else if (Record->hasNonTrivialDestructor())
6577 Record->setParamDestroyedInCallee(CanPass);
6578
6579 if (getLangOpts().ForceEmitVTables) {
6580 // If we want to emit all the vtables, we need to mark it as used. This
6581 // is especially required for cases like vtable assumption loads.
6582 MarkVTableUsed(Record->getInnerLocStart(), Record);
6583 }
6584}
6585
6586/// Look up the special member function that would be called by a special
6587/// member function for a subobject of class type.
6588///
6589/// \param Class The class type of the subobject.
6590/// \param CSM The kind of special member function.
6591/// \param FieldQuals If the subobject is a field, its cv-qualifiers.
6592/// \param ConstRHS True if this is a copy operation with a const object
6593/// on its RHS, that is, if the argument to the outer special member
6594/// function is 'const' and this is not a field marked 'mutable'.
6595static Sema::SpecialMemberOverloadResult lookupCallFromSpecialMember(
6596 Sema &S, CXXRecordDecl *Class, Sema::CXXSpecialMember CSM,
6597 unsigned FieldQuals, bool ConstRHS) {
6598 unsigned LHSQuals = 0;
6599 if (CSM == Sema::CXXCopyAssignment || CSM == Sema::CXXMoveAssignment)
6600 LHSQuals = FieldQuals;
6601
6602 unsigned RHSQuals = FieldQuals;
6603 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor)
6604 RHSQuals = 0;
6605 else if (ConstRHS)
6606 RHSQuals |= Qualifiers::Const;
6607
6608 return S.LookupSpecialMember(Class, CSM,
6609 RHSQuals & Qualifiers::Const,
6610 RHSQuals & Qualifiers::Volatile,
6611 false,
6612 LHSQuals & Qualifiers::Const,
6613 LHSQuals & Qualifiers::Volatile);
6614}
6615
6616class Sema::InheritedConstructorInfo {
6617 Sema &S;
6618 SourceLocation UseLoc;
6619
6620 /// A mapping from the base classes through which the constructor was
6621 /// inherited to the using shadow declaration in that base class (or a null
6622 /// pointer if the constructor was declared in that base class).
6623 llvm::DenseMap<CXXRecordDecl *, ConstructorUsingShadowDecl *>
6624 InheritedFromBases;
6625
6626public:
6627 InheritedConstructorInfo(Sema &S, SourceLocation UseLoc,
6628 ConstructorUsingShadowDecl *Shadow)
6629 : S(S), UseLoc(UseLoc) {
6630 bool DiagnosedMultipleConstructedBases = false;
6631 CXXRecordDecl *ConstructedBase = nullptr;
6632 UsingDecl *ConstructedBaseUsing = nullptr;
6633
6634 // Find the set of such base class subobjects and check that there's a
6635 // unique constructed subobject.
6636 for (auto *D : Shadow->redecls()) {
6637 auto *DShadow = cast<ConstructorUsingShadowDecl>(D);
6638 auto *DNominatedBase = DShadow->getNominatedBaseClass();
6639 auto *DConstructedBase = DShadow->getConstructedBaseClass();
6640
6641 InheritedFromBases.insert(
6642 std::make_pair(DNominatedBase->getCanonicalDecl(),
6643 DShadow->getNominatedBaseClassShadowDecl()));
6644 if (DShadow->constructsVirtualBase())
6645 InheritedFromBases.insert(
6646 std::make_pair(DConstructedBase->getCanonicalDecl(),
6647 DShadow->getConstructedBaseClassShadowDecl()));
6648 else
6649 assert(DNominatedBase == DConstructedBase)((DNominatedBase == DConstructedBase) ? static_cast<void>
(0) : __assert_fail ("DNominatedBase == DConstructedBase", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 6649, __PRETTY_FUNCTION__))
;
6650
6651 // [class.inhctor.init]p2:
6652 // If the constructor was inherited from multiple base class subobjects
6653 // of type B, the program is ill-formed.
6654 if (!ConstructedBase) {
6655 ConstructedBase = DConstructedBase;
6656 ConstructedBaseUsing = D->getUsingDecl();
6657 } else if (ConstructedBase != DConstructedBase &&
6658 !Shadow->isInvalidDecl()) {
6659 if (!DiagnosedMultipleConstructedBases) {
6660 S.Diag(UseLoc, diag::err_ambiguous_inherited_constructor)
6661 << Shadow->getTargetDecl();
6662 S.Diag(ConstructedBaseUsing->getLocation(),
6663 diag::note_ambiguous_inherited_constructor_using)
6664 << ConstructedBase;
6665 DiagnosedMultipleConstructedBases = true;
6666 }
6667 S.Diag(D->getUsingDecl()->getLocation(),
6668 diag::note_ambiguous_inherited_constructor_using)
6669 << DConstructedBase;
6670 }
6671 }
6672
6673 if (DiagnosedMultipleConstructedBases)
6674 Shadow->setInvalidDecl();
6675 }
6676
6677 /// Find the constructor to use for inherited construction of a base class,
6678 /// and whether that base class constructor inherits the constructor from a
6679 /// virtual base class (in which case it won't actually invoke it).
6680 std::pair<CXXConstructorDecl *, bool>
6681 findConstructorForBase(CXXRecordDecl *Base, CXXConstructorDecl *Ctor) const {
6682 auto It = InheritedFromBases.find(Base->getCanonicalDecl());
6683 if (It == InheritedFromBases.end())
6684 return std::make_pair(nullptr, false);
6685
6686 // This is an intermediary class.
6687 if (It->second)
6688 return std::make_pair(
6689 S.findInheritingConstructor(UseLoc, Ctor, It->second),
6690 It->second->constructsVirtualBase());
6691
6692 // This is the base class from which the constructor was inherited.
6693 return std::make_pair(Ctor, false);
6694 }
6695};
6696
6697/// Is the special member function which would be selected to perform the
6698/// specified operation on the specified class type a constexpr constructor?
6699static bool
6700specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl,
6701 Sema::CXXSpecialMember CSM, unsigned Quals,
6702 bool ConstRHS,
6703 CXXConstructorDecl *InheritedCtor = nullptr,
6704 Sema::InheritedConstructorInfo *Inherited = nullptr) {
6705 // If we're inheriting a constructor, see if we need to call it for this base
6706 // class.
6707 if (InheritedCtor) {
6708 assert(CSM == Sema::CXXDefaultConstructor)((CSM == Sema::CXXDefaultConstructor) ? static_cast<void>
(0) : __assert_fail ("CSM == Sema::CXXDefaultConstructor", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 6708, __PRETTY_FUNCTION__))
;
6709 auto BaseCtor =
6710 Inherited->findConstructorForBase(ClassDecl, InheritedCtor).first;
6711 if (BaseCtor)
6712 return BaseCtor->isConstexpr();
6713 }
6714
6715 if (CSM == Sema::CXXDefaultConstructor)
6716 return ClassDecl->hasConstexprDefaultConstructor();
6717 if (CSM == Sema::CXXDestructor)
6718 return ClassDecl->hasConstexprDestructor();
6719
6720 Sema::SpecialMemberOverloadResult SMOR =
6721 lookupCallFromSpecialMember(S, ClassDecl, CSM, Quals, ConstRHS);
6722 if (!SMOR.getMethod())
6723 // A constructor we wouldn't select can't be "involved in initializing"
6724 // anything.
6725 return true;
6726 return SMOR.getMethod()->isConstexpr();
6727}
6728
6729/// Determine whether the specified special member function would be constexpr
6730/// if it were implicitly defined.
6731static bool defaultedSpecialMemberIsConstexpr(
6732 Sema &S, CXXRecordDecl *ClassDecl, Sema::CXXSpecialMember CSM,
6733 bool ConstArg, CXXConstructorDecl *InheritedCtor = nullptr,
6734 Sema::InheritedConstructorInfo *Inherited = nullptr) {
6735 if (!S.getLangOpts().CPlusPlus11)
6736 return false;
6737
6738 // C++11 [dcl.constexpr]p4:
6739 // In the definition of a constexpr constructor [...]
6740 bool Ctor = true;
6741 switch (CSM) {
6742 case Sema::CXXDefaultConstructor:
6743 if (Inherited)
6744 break;
6745 // Since default constructor lookup is essentially trivial (and cannot
6746 // involve, for instance, template instantiation), we compute whether a
6747 // defaulted default constructor is constexpr directly within CXXRecordDecl.
6748 //
6749 // This is important for performance; we need to know whether the default
6750 // constructor is constexpr to determine whether the type is a literal type.
6751 return ClassDecl->defaultedDefaultConstructorIsConstexpr();
6752
6753 case Sema::CXXCopyConstructor:
6754 case Sema::CXXMoveConstructor:
6755 // For copy or move constructors, we need to perform overload resolution.
6756 break;
6757
6758 case Sema::CXXCopyAssignment:
6759 case Sema::CXXMoveAssignment:
6760 if (!S.getLangOpts().CPlusPlus14)
6761 return false;
6762 // In C++1y, we need to perform overload resolution.
6763 Ctor = false;
6764 break;
6765
6766 case Sema::CXXDestructor:
6767 return ClassDecl->defaultedDestructorIsConstexpr();
6768
6769 case Sema::CXXInvalid:
6770 return false;
6771 }
6772
6773 // -- if the class is a non-empty union, or for each non-empty anonymous
6774 // union member of a non-union class, exactly one non-static data member
6775 // shall be initialized; [DR1359]
6776 //
6777 // If we squint, this is guaranteed, since exactly one non-static data member
6778 // will be initialized (if the constructor isn't deleted), we just don't know
6779 // which one.
6780 if (Ctor && ClassDecl->isUnion())
6781 return CSM == Sema::CXXDefaultConstructor
6782 ? ClassDecl->hasInClassInitializer() ||
6783 !ClassDecl->hasVariantMembers()
6784 : true;
6785
6786 // -- the class shall not have any virtual base classes;
6787 if (Ctor && ClassDecl->getNumVBases())
6788 return false;
6789
6790 // C++1y [class.copy]p26:
6791 // -- [the class] is a literal type, and
6792 if (!Ctor && !ClassDecl->isLiteral())
6793 return false;
6794
6795 // -- every constructor involved in initializing [...] base class
6796 // sub-objects shall be a constexpr constructor;
6797 // -- the assignment operator selected to copy/move each direct base
6798 // class is a constexpr function, and
6799 for (const auto &B : ClassDecl->bases()) {
6800 const RecordType *BaseType = B.getType()->getAs<RecordType>();
6801 if (!BaseType) continue;
6802
6803 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
6804 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, 0, ConstArg,
6805 InheritedCtor, Inherited))
6806 return false;
6807 }
6808
6809 // -- every constructor involved in initializing non-static data members
6810 // [...] shall be a constexpr constructor;
6811 // -- every non-static data member and base class sub-object shall be
6812 // initialized
6813 // -- for each non-static data member of X that is of class type (or array
6814 // thereof), the assignment operator selected to copy/move that member is
6815 // a constexpr function
6816 for (const auto *F : ClassDecl->fields()) {
6817 if (F->isInvalidDecl())
6818 continue;
6819 if (CSM == Sema::CXXDefaultConstructor && F->hasInClassInitializer())
6820 continue;
6821 QualType BaseType = S.Context.getBaseElementType(F->getType());
6822 if (const RecordType *RecordTy = BaseType->getAs<RecordType>()) {
6823 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl());
6824 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM,
6825 BaseType.getCVRQualifiers(),
6826 ConstArg && !F->isMutable()))
6827 return false;
6828 } else if (CSM == Sema::CXXDefaultConstructor) {
6829 return false;
6830 }
6831 }
6832
6833 // All OK, it's constexpr!
6834 return true;
6835}
6836
6837namespace {
6838/// RAII object to register a defaulted function as having its exception
6839/// specification computed.
6840struct ComputingExceptionSpec {
6841 Sema &S;
6842
6843 ComputingExceptionSpec(Sema &S, FunctionDecl *FD, SourceLocation Loc)
6844 : S(S) {
6845 Sema::CodeSynthesisContext Ctx;
6846 Ctx.Kind = Sema::CodeSynthesisContext::ExceptionSpecEvaluation;
6847 Ctx.PointOfInstantiation = Loc;
6848 Ctx.Entity = FD;
6849 S.pushCodeSynthesisContext(Ctx);
6850 }
6851 ~ComputingExceptionSpec() {
6852 S.popCodeSynthesisContext();
6853 }
6854};
6855}
6856
6857static Sema::ImplicitExceptionSpecification
6858ComputeDefaultedSpecialMemberExceptionSpec(
6859 Sema &S, SourceLocation Loc, CXXMethodDecl *MD, Sema::CXXSpecialMember CSM,
6860 Sema::InheritedConstructorInfo *ICI);
6861
6862static Sema::ImplicitExceptionSpecification
6863ComputeDefaultedComparisonExceptionSpec(Sema &S, SourceLocation Loc,
6864 FunctionDecl *FD,
6865 Sema::DefaultedComparisonKind DCK);
6866
6867static Sema::ImplicitExceptionSpecification
6868computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, FunctionDecl *FD) {
6869 auto DFK = S.getDefaultedFunctionKind(FD);
6870 if (DFK.isSpecialMember())
6871 return ComputeDefaultedSpecialMemberExceptionSpec(
6872 S, Loc, cast<CXXMethodDecl>(FD), DFK.asSpecialMember(), nullptr);
6873 if (DFK.isComparison())
6874 return ComputeDefaultedComparisonExceptionSpec(S, Loc, FD,
6875 DFK.asComparison());
6876
6877 auto *CD = cast<CXXConstructorDecl>(FD);
6878 assert(CD->getInheritedConstructor() &&((CD->getInheritedConstructor() && "only defaulted functions and inherited constructors have implicit "
"exception specs") ? static_cast<void> (0) : __assert_fail
("CD->getInheritedConstructor() && \"only defaulted functions and inherited constructors have implicit \" \"exception specs\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 6880, __PRETTY_FUNCTION__))
6879 "only defaulted functions and inherited constructors have implicit "((CD->getInheritedConstructor() && "only defaulted functions and inherited constructors have implicit "
"exception specs") ? static_cast<void> (0) : __assert_fail
("CD->getInheritedConstructor() && \"only defaulted functions and inherited constructors have implicit \" \"exception specs\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 6880, __PRETTY_FUNCTION__))
6880 "exception specs")((CD->getInheritedConstructor() && "only defaulted functions and inherited constructors have implicit "
"exception specs") ? static_cast<void> (0) : __assert_fail
("CD->getInheritedConstructor() && \"only defaulted functions and inherited constructors have implicit \" \"exception specs\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 6880, __PRETTY_FUNCTION__))
;
6881 Sema::InheritedConstructorInfo ICI(
6882 S, Loc, CD->getInheritedConstructor().getShadowDecl());
6883 return ComputeDefaultedSpecialMemberExceptionSpec(
6884 S, Loc, CD, Sema::CXXDefaultConstructor, &ICI);
6885}
6886
6887static FunctionProtoType::ExtProtoInfo getImplicitMethodEPI(Sema &S,
6888 CXXMethodDecl *MD) {
6889 FunctionProtoType::ExtProtoInfo EPI;
6890
6891 // Build an exception specification pointing back at this member.
6892 EPI.ExceptionSpec.Type = EST_Unevaluated;
6893 EPI.ExceptionSpec.SourceDecl = MD;
6894
6895 // Set the calling convention to the default for C++ instance methods.
6896 EPI.ExtInfo = EPI.ExtInfo.withCallingConv(
6897 S.Context.getDefaultCallingConvention(/*IsVariadic=*/false,
6898 /*IsCXXMethod=*/true));
6899 return EPI;
6900}
6901
6902void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, FunctionDecl *FD) {
6903 const FunctionProtoType *FPT = FD->getType()->castAs<FunctionProtoType>();
6904 if (FPT->getExceptionSpecType() != EST_Unevaluated)
6905 return;
6906
6907 // Evaluate the exception specification.
6908 auto IES = computeImplicitExceptionSpec(*this, Loc, FD);
6909 auto ESI = IES.getExceptionSpec();
6910
6911 // Update the type of the special member to use it.
6912 UpdateExceptionSpec(FD, ESI);
6913}
6914
6915void Sema::CheckExplicitlyDefaultedFunction(Scope *S, FunctionDecl *FD) {
6916 assert(FD->isExplicitlyDefaulted() && "not explicitly-defaulted")((FD->isExplicitlyDefaulted() && "not explicitly-defaulted"
) ? static_cast<void> (0) : __assert_fail ("FD->isExplicitlyDefaulted() && \"not explicitly-defaulted\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 6916, __PRETTY_FUNCTION__))
;
6917
6918 DefaultedFunctionKind DefKind = getDefaultedFunctionKind(FD);
6919 if (!DefKind) {
6920 assert(FD->getDeclContext()->isDependentContext())((FD->getDeclContext()->isDependentContext()) ? static_cast
<void> (0) : __assert_fail ("FD->getDeclContext()->isDependentContext()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 6920, __PRETTY_FUNCTION__))
;
6921 return;
6922 }
6923
6924 if (DefKind.isSpecialMember()
6925 ? CheckExplicitlyDefaultedSpecialMember(cast<CXXMethodDecl>(FD),
6926 DefKind.asSpecialMember())
6927 : CheckExplicitlyDefaultedComparison(S, FD, DefKind.asComparison()))
6928 FD->setInvalidDecl();
6929}
6930
6931bool Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD,
6932 CXXSpecialMember CSM) {
6933 CXXRecordDecl *RD = MD->getParent();
6934
6935 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\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 6936, __PRETTY_FUNCTION__))
6936 "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\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 6936, __PRETTY_FUNCTION__))
;
6937
6938 // Defer all checking for special members of a dependent type.
6939 if (RD->isDependentType())
6940 return false;
6941
6942 // Whether this was the first-declared instance of the constructor.
6943 // This affects whether we implicitly add an exception spec and constexpr.
6944 bool First = MD == MD->getCanonicalDecl();
6945
6946 bool HadError = false;
6947
6948 // C++11 [dcl.fct.def.default]p1:
6949 // A function that is explicitly defaulted shall
6950 // -- be a special member function [...] (checked elsewhere),
6951 // -- have the same type (except for ref-qualifiers, and except that a
6952 // copy operation can take a non-const reference) as an implicit
6953 // declaration, and
6954 // -- not have default arguments.
6955 // C++2a changes the second bullet to instead delete the function if it's
6956 // defaulted on its first declaration, unless it's "an assignment operator,
6957 // and its return type differs or its parameter type is not a reference".
6958 bool DeleteOnTypeMismatch = getLangOpts().CPlusPlus2a && First;
6959 bool ShouldDeleteForTypeMismatch = false;
6960 unsigned ExpectedParams = 1;
6961 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor)
6962 ExpectedParams = 0;
6963 if (MD->getNumParams() != ExpectedParams) {
6964 // This checks for default arguments: a copy or move constructor with a
6965 // default argument is classified as a default constructor, and assignment
6966 // operations and destructors can't have default arguments.
6967 Diag(MD->getLocation(), diag::err_defaulted_special_member_params)
6968 << CSM << MD->getSourceRange();
6969 HadError = true;
6970 } else if (MD->isVariadic()) {
6971 if (DeleteOnTypeMismatch)
6972 ShouldDeleteForTypeMismatch = true;
6973 else {
6974 Diag(MD->getLocation(), diag::err_defaulted_special_member_variadic)
6975 << CSM << MD->getSourceRange();
6976 HadError = true;
6977 }
6978 }
6979
6980 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>();
6981
6982 bool CanHaveConstParam = false;
6983 if (CSM == CXXCopyConstructor)
6984 CanHaveConstParam = RD->implicitCopyConstructorHasConstParam();
6985 else if (CSM == CXXCopyAssignment)
6986 CanHaveConstParam = RD->implicitCopyAssignmentHasConstParam();
6987
6988 QualType ReturnType = Context.VoidTy;
6989 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) {
6990 // Check for return type matching.
6991 ReturnType = Type->getReturnType();
6992
6993 QualType DeclType = Context.getTypeDeclType(RD);
6994 DeclType = Context.getAddrSpaceQualType(DeclType, MD->getMethodQualifiers().getAddressSpace());
6995 QualType ExpectedReturnType = Context.getLValueReferenceType(DeclType);
6996
6997 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) {
6998 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type)
6999 << (CSM == CXXMoveAssignment) << ExpectedReturnType;
7000 HadError = true;
7001 }
7002
7003 // A defaulted special member cannot have cv-qualifiers.
7004 if (Type->getMethodQuals().hasConst() || Type->getMethodQuals().hasVolatile()) {
7005 if (DeleteOnTypeMismatch)
7006 ShouldDeleteForTypeMismatch = true;
7007 else {
7008 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals)
7009 << (CSM == CXXMoveAssignment) << getLangOpts().CPlusPlus14;
7010 HadError = true;
7011 }
7012 }
7013 }
7014
7015 // Check for parameter type matching.
7016 QualType ArgType = ExpectedParams ? Type->getParamType(0) : QualType();
7017 bool HasConstParam = false;
7018 if (ExpectedParams && ArgType->isReferenceType()) {
7019 // Argument must be reference to possibly-const T.
7020 QualType ReferentType = ArgType->getPointeeType();
7021 HasConstParam = ReferentType.isConstQualified();
7022
7023 if (ReferentType.isVolatileQualified()) {
7024 if (DeleteOnTypeMismatch)
7025 ShouldDeleteForTypeMismatch = true;
7026 else {
7027 Diag(MD->getLocation(),
7028 diag::err_defaulted_special_member_volatile_param) << CSM;
7029 HadError = true;
7030 }
7031 }
7032
7033 if (HasConstParam && !CanHaveConstParam) {
7034 if (DeleteOnTypeMismatch)
7035 ShouldDeleteForTypeMismatch = true;
7036 else if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) {
7037 Diag(MD->getLocation(),
7038 diag::err_defaulted_special_member_copy_const_param)
7039 << (CSM == CXXCopyAssignment);
7040 // FIXME: Explain why this special member can't be const.
7041 HadError = true;
7042 } else {
7043 Diag(MD->getLocation(),
7044 diag::err_defaulted_special_member_move_const_param)
7045 << (CSM == CXXMoveAssignment);
7046 HadError = true;
7047 }
7048 }
7049 } else if (ExpectedParams) {
7050 // A copy assignment operator can take its argument by value, but a
7051 // defaulted one cannot.
7052 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\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 7052, __PRETTY_FUNCTION__))
;
7053 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref);
7054 HadError = true;
7055 }
7056
7057 // C++11 [dcl.fct.def.default]p2:
7058 // An explicitly-defaulted function may be declared constexpr only if it
7059 // would have been implicitly declared as constexpr,
7060 // Do not apply this rule to members of class templates, since core issue 1358
7061 // makes such functions always instantiate to constexpr functions. For
7062 // functions which cannot be constexpr (for non-constructors in C++11 and for
7063 // destructors in C++14 and C++17), this is checked elsewhere.
7064 //
7065 // FIXME: This should not apply if the member is deleted.
7066 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM,
7067 HasConstParam);
7068 if ((getLangOpts().CPlusPlus2a ||
7069 (getLangOpts().CPlusPlus14 ? !isa<CXXDestructorDecl>(MD)
7070 : isa<CXXConstructorDecl>(MD))) &&
7071 MD->isConstexpr() && !Constexpr &&
7072 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) {
7073 Diag(MD->getBeginLoc(), MD->isConsteval()
7074 ? diag::err_incorrect_defaulted_consteval
7075 : diag::err_incorrect_defaulted_constexpr)
7076 << CSM;
7077 // FIXME: Explain why the special member can't be constexpr.
7078 HadError = true;
7079 }
7080
7081 if (First) {
7082 // C++2a [dcl.fct.def.default]p3:
7083 // If a function is explicitly defaulted on its first declaration, it is
7084 // implicitly considered to be constexpr if the implicit declaration
7085 // would be.
7086 MD->setConstexprKind(Constexpr ? CSK_constexpr : CSK_unspecified);
7087
7088 if (!Type->hasExceptionSpec()) {
7089 // C++2a [except.spec]p3:
7090 // If a declaration of a function does not have a noexcept-specifier
7091 // [and] is defaulted on its first declaration, [...] the exception
7092 // specification is as specified below
7093 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo();
7094 EPI.ExceptionSpec.Type = EST_Unevaluated;
7095 EPI.ExceptionSpec.SourceDecl = MD;
7096 MD->setType(Context.getFunctionType(ReturnType,
7097 llvm::makeArrayRef(&ArgType,
7098 ExpectedParams),
7099 EPI));
7100 }
7101 }
7102
7103 if (ShouldDeleteForTypeMismatch || ShouldDeleteSpecialMember(MD, CSM)) {
7104 if (First) {
7105 SetDeclDeleted(MD, MD->getLocation());
7106 if (!inTemplateInstantiation() && !HadError) {
7107 Diag(MD->getLocation(), diag::warn_defaulted_method_deleted) << CSM;
7108 if (ShouldDeleteForTypeMismatch) {
7109 Diag(MD->getLocation(), diag::note_deleted_type_mismatch) << CSM;
7110 } else {
7111 ShouldDeleteSpecialMember(MD, CSM, nullptr, /*Diagnose*/true);
7112 }
7113 }
7114 if (ShouldDeleteForTypeMismatch && !HadError) {
7115 Diag(MD->getLocation(),
7116 diag::warn_cxx17_compat_defaulted_method_type_mismatch) << CSM;
7117 }
7118 } else {
7119 // C++11 [dcl.fct.def.default]p4:
7120 // [For a] user-provided explicitly-defaulted function [...] if such a
7121 // function is implicitly defined as deleted, the program is ill-formed.
7122 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM;
7123 assert(!ShouldDeleteForTypeMismatch && "deleted non-first decl")((!ShouldDeleteForTypeMismatch && "deleted non-first decl"
) ? static_cast<void> (0) : __assert_fail ("!ShouldDeleteForTypeMismatch && \"deleted non-first decl\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 7123, __PRETTY_FUNCTION__))
;
7124 ShouldDeleteSpecialMember(MD, CSM, nullptr, /*Diagnose*/true);
7125 HadError = true;
7126 }
7127 }
7128
7129 return HadError;
7130}
7131
7132namespace {
7133/// Helper class for building and checking a defaulted comparison.
7134///
7135/// Defaulted functions are built in two phases:
7136///
7137/// * First, the set of operations that the function will perform are
7138/// identified, and some of them are checked. If any of the checked
7139/// operations is invalid in certain ways, the comparison function is
7140/// defined as deleted and no body is built.
7141/// * Then, if the function is not defined as deleted, the body is built.
7142///
7143/// This is accomplished by performing two visitation steps over the eventual
7144/// body of the function.
7145template<typename Derived, typename ResultList, typename Result,
7146 typename Subobject>
7147class DefaultedComparisonVisitor {
7148public:
7149 using DefaultedComparisonKind = Sema::DefaultedComparisonKind;
7150
7151 DefaultedComparisonVisitor(Sema &S, CXXRecordDecl *RD, FunctionDecl *FD,
7152 DefaultedComparisonKind DCK)
7153 : S(S), RD(RD), FD(FD), DCK(DCK) {
7154 if (auto *Info = FD->getDefaultedFunctionInfo()) {
7155 // FIXME: Change CreateOverloadedBinOp to take an ArrayRef instead of an
7156 // UnresolvedSet to avoid this copy.
7157 Fns.assign(Info->getUnqualifiedLookups().begin(),
7158 Info->getUnqualifiedLookups().end());
7159 }
7160 }
7161
7162 ResultList visit() {
7163 // The type of an lvalue naming a parameter of this function.
7164 QualType ParamLvalType =
7165 FD->getParamDecl(0)->getType().getNonReferenceType();
7166
7167 ResultList Results;
7168
7169 switch (DCK) {
7170 case DefaultedComparisonKind::None:
7171 llvm_unreachable("not a defaulted comparison")::llvm::llvm_unreachable_internal("not a defaulted comparison"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 7171)
;
7172
7173 case DefaultedComparisonKind::Equal:
7174 case DefaultedComparisonKind::ThreeWay:
7175 getDerived().visitSubobjects(Results, RD, ParamLvalType.getQualifiers());
7176 return Results;
7177
7178 case DefaultedComparisonKind::NotEqual:
7179 case DefaultedComparisonKind::Relational:
7180 Results.add(getDerived().visitExpandedSubobject(
7181 ParamLvalType, getDerived().getCompleteObject()));
7182 return Results;
7183 }
7184 llvm_unreachable("")::llvm::llvm_unreachable_internal("", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 7184)
;
7185 }
7186
7187protected:
7188 Derived &getDerived() { return static_cast<Derived&>(*this); }
7189
7190 /// Visit the expanded list of subobjects of the given type, as specified in
7191 /// C++2a [class.compare.default].
7192 ///
7193 /// \return \c true if the ResultList object said we're done, \c false if not.
7194 bool visitSubobjects(ResultList &Results, CXXRecordDecl *Record,
7195 Qualifiers Quals) {
7196 // C++2a [class.compare.default]p4:
7197 // The direct base class subobjects of C
7198 for (CXXBaseSpecifier &Base : Record->bases())
7199 if (Results.add(getDerived().visitSubobject(
7200 S.Context.getQualifiedType(Base.getType(), Quals),
7201 getDerived().getBase(&Base))))
7202 return true;
7203
7204 // followed by the non-static data members of C
7205 for (FieldDecl *Field : Record->fields()) {
7206 // Recursively expand anonymous structs.
7207 if (Field->isAnonymousStructOrUnion()) {
7208 if (visitSubobjects(Results, Field->getType()->getAsCXXRecordDecl(),
7209 Quals))
7210 return true;
7211 continue;
7212 }
7213
7214 // Figure out the type of an lvalue denoting this field.
7215 Qualifiers FieldQuals = Quals;
7216 if (Field->isMutable())
7217 FieldQuals.removeConst();
7218 QualType FieldType =
7219 S.Context.getQualifiedType(Field->getType(), FieldQuals);
7220
7221 if (Results.add(getDerived().visitSubobject(
7222 FieldType, getDerived().getField(Field))))
7223 return true;
7224 }
7225
7226 // form a list of subobjects.
7227 return false;
7228 }
7229
7230 Result visitSubobject(QualType Type, Subobject Subobj) {
7231 // In that list, any subobject of array type is recursively expanded
7232 const ArrayType *AT = S.Context.getAsArrayType(Type);
7233 if (auto *CAT = dyn_cast_or_null<ConstantArrayType>(AT))
7234 return getDerived().visitSubobjectArray(CAT->getElementType(),
7235 CAT->getSize(), Subobj);
7236 return getDerived().visitExpandedSubobject(Type, Subobj);
7237 }
7238
7239 Result visitSubobjectArray(QualType Type, const llvm::APInt &Size,
7240 Subobject Subobj) {
7241 return getDerived().visitSubobject(Type, Subobj);
7242 }
7243
7244protected:
7245 Sema &S;
7246 CXXRecordDecl *RD;
7247 FunctionDecl *FD;
7248 DefaultedComparisonKind DCK;
7249 UnresolvedSet<16> Fns;
7250};
7251
7252/// Information about a defaulted comparison, as determined by
7253/// DefaultedComparisonAnalyzer.
7254struct DefaultedComparisonInfo {
7255 bool Deleted = false;
7256 bool Constexpr = true;
7257 ComparisonCategoryType Category = ComparisonCategoryType::StrongOrdering;
7258
7259 static DefaultedComparisonInfo deleted() {
7260 DefaultedComparisonInfo Deleted;
7261 Deleted.Deleted = true;
7262 return Deleted;
7263 }
7264
7265 bool add(const DefaultedComparisonInfo &R) {
7266 Deleted |= R.Deleted;
7267 Constexpr &= R.Constexpr;
7268 Category = commonComparisonType(Category, R.Category);
7269 return Deleted;
7270 }
7271};
7272
7273/// An element in the expanded list of subobjects of a defaulted comparison, as
7274/// specified in C++2a [class.compare.default]p4.
7275struct DefaultedComparisonSubobject {
7276 enum { CompleteObject, Member, Base } Kind;
7277 NamedDecl *Decl;
7278 SourceLocation Loc;
7279};
7280
7281/// A visitor over the notional body of a defaulted comparison that determines
7282/// whether that body would be deleted or constexpr.
7283class DefaultedComparisonAnalyzer
7284 : public DefaultedComparisonVisitor<DefaultedComparisonAnalyzer,
7285 DefaultedComparisonInfo,
7286 DefaultedComparisonInfo,
7287 DefaultedComparisonSubobject> {
7288public:
7289 enum DiagnosticKind { NoDiagnostics, ExplainDeleted, ExplainConstexpr };
7290
7291private:
7292 DiagnosticKind Diagnose;
7293
7294public:
7295 using Base = DefaultedComparisonVisitor;
7296 using Result = DefaultedComparisonInfo;
7297 using Subobject = DefaultedComparisonSubobject;
7298
7299 friend Base;
7300
7301 DefaultedComparisonAnalyzer(Sema &S, CXXRecordDecl *RD, FunctionDecl *FD,
7302 DefaultedComparisonKind DCK,
7303 DiagnosticKind Diagnose = NoDiagnostics)
7304 : Base(S, RD, FD, DCK), Diagnose(Diagnose) {}
7305
7306 Result visit() {
7307 if ((DCK == DefaultedComparisonKind::Equal ||
7308 DCK == DefaultedComparisonKind::ThreeWay) &&
7309 RD->hasVariantMembers()) {
7310 // C++2a [class.compare.default]p2 [P2002R0]:
7311 // A defaulted comparison operator function for class C is defined as
7312 // deleted if [...] C has variant members.
7313 if (Diagnose == ExplainDeleted) {
7314 S.Diag(FD->getLocation(), diag::note_defaulted_comparison_union)
7315 << FD << RD->isUnion() << RD;
7316 }
7317 return Result::deleted();
7318 }
7319
7320 return Base::visit();
7321 }
7322
7323private:
7324 Subobject getCompleteObject() {
7325 return Subobject{Subobject::CompleteObject, nullptr, FD->getLocation()};
7326 }
7327
7328 Subobject getBase(CXXBaseSpecifier *Base) {
7329 return Subobject{Subobject::Base, Base->getType()->getAsCXXRecordDecl(),
7330 Base->getBaseTypeLoc()};
7331 }
7332
7333 Subobject getField(FieldDecl *Field) {
7334 return Subobject{Subobject::Member, Field, Field->getLocation()};
7335 }
7336
7337 Result visitExpandedSubobject(QualType Type, Subobject Subobj) {
7338 // C++2a [class.compare.default]p2 [P2002R0]:
7339 // A defaulted <=> or == operator function for class C is defined as
7340 // deleted if any non-static data member of C is of reference type
7341 if (Type->isReferenceType()) {
7342 if (Diagnose == ExplainDeleted) {
7343 S.Diag(Subobj.Loc, diag::note_defaulted_comparison_reference_member)
7344 << FD << RD;
7345 }
7346 return Result::deleted();
7347 }
7348
7349 // [...] Let xi be an lvalue denoting the ith element [...]
7350 OpaqueValueExpr Xi(FD->getLocation(), Type, VK_LValue);
7351 Expr *Args[] = {&Xi, &Xi};
7352
7353 // All operators start by trying to apply that same operator recursively.
7354 OverloadedOperatorKind OO = FD->getOverloadedOperator();
7355 assert(OO != OO_None && "not an overloaded operator!")((OO != OO_None && "not an overloaded operator!") ? static_cast
<void> (0) : __assert_fail ("OO != OO_None && \"not an overloaded operator!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 7355, __PRETTY_FUNCTION__))
;
7356 return visitBinaryOperator(OO, Args, Subobj);
7357 }
7358
7359 Result
7360 visitBinaryOperator(OverloadedOperatorKind OO, ArrayRef<Expr *> Args,
7361 Subobject Subobj,
7362 OverloadCandidateSet *SpaceshipCandidates = nullptr) {
7363 // Note that there is no need to consider rewritten candidates here if
7364 // we've already found there is no viable 'operator<=>' candidate (and are
7365 // considering synthesizing a '<=>' from '==' and '<').
7366 OverloadCandidateSet CandidateSet(
7367 FD->getLocation(), OverloadCandidateSet::CSK_Operator,
7368 OverloadCandidateSet::OperatorRewriteInfo(
7369 OO, /*AllowRewrittenCandidates=*/!SpaceshipCandidates));
7370
7371 /// C++2a [class.compare.default]p1 [P2002R0]:
7372 /// [...] the defaulted function itself is never a candidate for overload
7373 /// resolution [...]
7374 CandidateSet.exclude(FD);
7375
7376 S.LookupOverloadedBinOp(CandidateSet, OO, Fns, Args);
7377
7378 Result R;
7379
7380 OverloadCandidateSet::iterator Best;
7381 switch (CandidateSet.BestViableFunction(S, FD->getLocation(), Best)) {
7382 case OR_Success: {
7383 // C++2a [class.compare.secondary]p2 [P2002R0]:
7384 // The operator function [...] is defined as deleted if [...] the
7385 // candidate selected by overload resolution is not a rewritten
7386 // candidate.
7387 if ((DCK == DefaultedComparisonKind::NotEqual ||
7388 DCK == DefaultedComparisonKind::Relational) &&
7389 !Best->RewriteKind) {
7390 if (Diagnose == ExplainDeleted) {
7391 S.Diag(Best->Function->getLocation(),
7392 diag::note_defaulted_comparison_not_rewritten_callee)
7393 << FD;
7394 }
7395 return Result::deleted();
7396 }
7397
7398 // Throughout C++2a [class.compare]: if overload resolution does not
7399 // result in a usable function, the candidate function is defined as
7400 // deleted. This requires that we selected an accessible function.
7401 //
7402 // Note that this only considers the access of the function when named
7403 // within the type of the subobject, and not the access path for any
7404 // derived-to-base conversion.
7405 CXXRecordDecl *ArgClass = Args[0]->getType()->getAsCXXRecordDecl();
7406 if (ArgClass && Best->FoundDecl.getDecl() &&
7407 Best->FoundDecl.getDecl()->isCXXClassMember()) {
7408 QualType ObjectType = Subobj.Kind == Subobject::Member
7409 ? Args[0]->getType()
7410 : S.Context.getRecordType(RD);
7411 if (!S.isMemberAccessibleForDeletion(
7412 ArgClass, Best->FoundDecl, ObjectType, Subobj.Loc,
7413 Diagnose == ExplainDeleted
7414 ? S.PDiag(diag::note_defaulted_comparison_inaccessible)
7415 << FD << Subobj.Kind << Subobj.Decl
7416 : S.PDiag()))
7417 return Result::deleted();
7418 }
7419
7420 // C++2a [class.compare.default]p3 [P2002R0]:
7421 // A defaulted comparison function is constexpr-compatible if [...]
7422 // no overlod resolution performed [...] results in a non-constexpr
7423 // function.
7424 if (FunctionDecl *BestFD = Best->Function) {
7425 assert(!BestFD->isDeleted() && "wrong overload resolution result")((!BestFD->isDeleted() && "wrong overload resolution result"
) ? static_cast<void> (0) : __assert_fail ("!BestFD->isDeleted() && \"wrong overload resolution result\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 7425, __PRETTY_FUNCTION__))
;
7426 // If it's not constexpr, explain why not.
7427 if (Diagnose == ExplainConstexpr && !BestFD->isConstexpr()) {
7428 if (Subobj.Kind != Subobject::CompleteObject)
7429 S.Diag(Subobj.Loc, diag::note_defaulted_comparison_not_constexpr)
7430 << Subobj.Kind << Subobj.Decl;
7431 S.Diag(BestFD->getLocation(),
7432 diag::note_defaulted_comparison_not_constexpr_here);
7433 // Bail out after explaining; we don't want any more notes.
7434 return Result::deleted();
7435 }
7436 R.Constexpr &= BestFD->isConstexpr();
7437 }
7438
7439 if (OO == OO_Spaceship && FD->getReturnType()->isUndeducedAutoType()) {
7440 if (auto *BestFD = Best->Function) {
7441 if (auto *Info = S.Context.CompCategories.lookupInfoForType(
7442 BestFD->getCallResultType())) {
7443 R.Category = Info->Kind;
7444 } else {
7445 if (Diagnose == ExplainDeleted) {
7446 S.Diag(Subobj.Loc, diag::note_defaulted_comparison_cannot_deduce)
7447 << Subobj.Kind << Subobj.Decl
7448 << BestFD->getCallResultType().withoutLocalFastQualifiers();
7449 S.Diag(BestFD->getLocation(),
7450 diag::note_defaulted_comparison_cannot_deduce_callee)
7451 << Subobj.Kind << Subobj.Decl;
7452 }
7453 return Result::deleted();
7454 }
7455 } else {
7456 Optional<ComparisonCategoryType> Cat =
7457 getComparisonCategoryForBuiltinCmp(Args[0]->getType());
7458 assert(Cat && "no category for builtin comparison?")((Cat && "no category for builtin comparison?") ? static_cast
<void> (0) : __assert_fail ("Cat && \"no category for builtin comparison?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 7458, __PRETTY_FUNCTION__))
;
7459 R.Category = *Cat;
7460 }
7461 }
7462
7463 // Note that we might be rewriting to a different operator. That call is
7464 // not considered until we come to actually build the comparison function.
7465 break;
7466 }
7467
7468 case OR_Ambiguous:
7469 if (Diagnose == ExplainDeleted) {
7470 unsigned Kind = 0;
7471 if (FD->getOverloadedOperator() == OO_Spaceship && OO != OO_Spaceship)
7472 Kind = OO == OO_EqualEqual ? 1 : 2;
7473 CandidateSet.NoteCandidates(
7474 PartialDiagnosticAt(
7475 Subobj.Loc, S.PDiag(diag::note_defaulted_comparison_ambiguous)
7476 << FD << Kind << Subobj.Kind << Subobj.Decl),
7477 S, OCD_AmbiguousCandidates, Args);
7478 }
7479 R = Result::deleted();
7480 break;
7481
7482 case OR_Deleted:
7483 if (Diagnose == ExplainDeleted) {
7484 if ((DCK == DefaultedComparisonKind::NotEqual ||
7485 DCK == DefaultedComparisonKind::Relational) &&
7486 !Best->RewriteKind) {
7487 S.Diag(Best->Function->getLocation(),
7488 diag::note_defaulted_comparison_not_rewritten_callee)
7489 << FD;
7490 } else {
7491 S.Diag(Subobj.Loc,
7492 diag::note_defaulted_comparison_calls_deleted)
7493 << FD << Subobj.Kind << Subobj.Decl;
7494 S.NoteDeletedFunction(Best->Function);
7495 }
7496 }
7497 R = Result::deleted();
7498 break;
7499
7500 case OR_No_Viable_Function:
7501 // If there's no usable candidate, we're done unless we can rewrite a
7502 // '<=>' in terms of '==' and '<'.
7503 if (OO == OO_Spaceship &&
7504 S.Context.CompCategories.lookupInfoForType(FD->getReturnType())) {
7505 // For any kind of comparison category return type, we need a usable
7506 // '==' and a usable '<'.
7507 if (!R.add(visitBinaryOperator(OO_EqualEqual, Args, Subobj,
7508 &CandidateSet)))
7509 R.add(visitBinaryOperator(OO_Less, Args, Subobj, &CandidateSet));
7510 break;
7511 }
7512
7513 if (Diagnose == ExplainDeleted) {
7514 S.Diag(Subobj.Loc, diag::note_defaulted_comparison_no_viable_function)
7515 << FD << Subobj.Kind << Subobj.Decl;
7516
7517 // For a three-way comparison, list both the candidates for the
7518 // original operator and the candidates for the synthesized operator.
7519 if (SpaceshipCandidates) {
7520 SpaceshipCandidates->NoteCandidates(
7521 S, Args,
7522 SpaceshipCandidates->CompleteCandidates(S, OCD_AllCandidates,
7523 Args, FD->getLocation()));
7524 S.Diag(Subobj.Loc,
7525 diag::note_defaulted_comparison_no_viable_function_synthesized)
7526 << (OO == OO_EqualEqual ? 0 : 1);
7527 }
7528
7529 CandidateSet.NoteCandidates(
7530 S, Args,
7531 CandidateSet.CompleteCandidates(S, OCD_AllCandidates, Args,
7532 FD->getLocation()));
7533 }
7534 R = Result::deleted();
7535 break;
7536 }
7537
7538 return R;
7539 }
7540};
7541
7542/// A list of statements.
7543struct StmtListResult {
7544 bool IsInvalid = false;
7545 llvm::SmallVector<Stmt*, 16> Stmts;
7546
7547 bool add(const StmtResult &S) {
7548 IsInvalid |= S.isInvalid();
7549 if (IsInvalid)
7550 return true;
7551 Stmts.push_back(S.get());
7552 return false;
7553 }
7554};
7555
7556/// A visitor over the notional body of a defaulted comparison that synthesizes
7557/// the actual body.
7558class DefaultedComparisonSynthesizer
7559 : public DefaultedComparisonVisitor<DefaultedComparisonSynthesizer,
7560 StmtListResult, StmtResult,
7561 std::pair<ExprResult, ExprResult>> {
7562 SourceLocation Loc;
7563 unsigned ArrayDepth = 0;
7564
7565public:
7566 using Base = DefaultedComparisonVisitor;
7567 using ExprPair = std::pair<ExprResult, ExprResult>;
7568
7569 friend Base;
7570
7571 DefaultedComparisonSynthesizer(Sema &S, CXXRecordDecl *RD, FunctionDecl *FD,
7572 DefaultedComparisonKind DCK,
7573 SourceLocation BodyLoc)
7574 : Base(S, RD, FD, DCK), Loc(BodyLoc) {}
7575
7576 /// Build a suitable function body for this defaulted comparison operator.
7577 StmtResult build() {
7578 Sema::CompoundScopeRAII CompoundScope(S);
7579
7580 StmtListResult Stmts = visit();
7581 if (Stmts.IsInvalid)
7582 return StmtError();
7583
7584 ExprResult RetVal;
7585 switch (DCK) {
7586 case DefaultedComparisonKind::None:
7587 llvm_unreachable("not a defaulted comparison")::llvm::llvm_unreachable_internal("not a defaulted comparison"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 7587)
;
7588
7589 case DefaultedComparisonKind::Equal: {
7590 // C++2a [class.eq]p3:
7591 // [...] compar[e] the corresponding elements [...] until the first
7592 // index i where xi == yi yields [...] false. If no such index exists,
7593 // V is true. Otherwise, V is false.
7594 //
7595 // Join the comparisons with '&&'s and return the result. Use a right
7596 // fold (traversing the conditions right-to-left), because that
7597 // short-circuits more naturally.
7598 auto OldStmts = std::move(Stmts.Stmts);
7599 Stmts.Stmts.clear();
7600 ExprResult CmpSoFar;
7601 // Finish a particular comparison chain.
7602 auto FinishCmp = [&] {
7603 if (Expr *Prior = CmpSoFar.get()) {
7604 // Convert the last expression to 'return ...;'
7605 if (RetVal.isUnset() && Stmts.Stmts.empty())
7606 RetVal = CmpSoFar;
7607 // Convert any prior comparison to 'if (!(...)) return false;'
7608 else if (Stmts.add(buildIfNotCondReturnFalse(Prior)))
7609 return true;
7610 CmpSoFar = ExprResult();
7611 }
7612 return false;
7613 };
7614 for (Stmt *EAsStmt : llvm::reverse(OldStmts)) {
7615 Expr *E = dyn_cast<Expr>(EAsStmt);
7616 if (!E) {
7617 // Found an array comparison.
7618 if (FinishCmp() || Stmts.add(EAsStmt))
7619 return StmtError();
7620 continue;
7621 }
7622
7623 if (CmpSoFar.isUnset()) {
7624 CmpSoFar = E;
7625 continue;
7626 }
7627 CmpSoFar = S.CreateBuiltinBinOp(Loc, BO_LAnd, E, CmpSoFar.get());
7628 if (CmpSoFar.isInvalid())
7629 return StmtError();
7630 }
7631 if (FinishCmp())
7632 return StmtError();
7633 std::reverse(Stmts.Stmts.begin(), Stmts.Stmts.end());
7634 // If no such index exists, V is true.
7635 if (RetVal.isUnset())
7636 RetVal = S.ActOnCXXBoolLiteral(Loc, tok::kw_true);
7637 break;
7638 }
7639
7640 case DefaultedComparisonKind::ThreeWay: {
7641 // Per C++2a [class.spaceship]p3, as a fallback add:
7642 // return static_cast<R>(std::strong_ordering::equal);
7643 QualType StrongOrdering = S.CheckComparisonCategoryType(
7644 ComparisonCategoryType::StrongOrdering, Loc,
7645 Sema::ComparisonCategoryUsage::DefaultedOperator);
7646 if (StrongOrdering.isNull())
7647 return StmtError();
7648 VarDecl *EqualVD = S.Context.CompCategories.getInfoForType(StrongOrdering)
7649 .getValueInfo(ComparisonCategoryResult::Equal)
7650 ->VD;
7651 RetVal = getDecl(EqualVD);
7652 if (RetVal.isInvalid())
7653 return StmtError();
7654 RetVal = buildStaticCastToR(RetVal.get());
7655 break;
7656 }
7657
7658 case DefaultedComparisonKind::NotEqual:
7659 case DefaultedComparisonKind::Relational:
7660 RetVal = cast<Expr>(Stmts.Stmts.pop_back_val());
7661 break;
7662 }
7663
7664 // Build the final return statement.
7665 if (RetVal.isInvalid())
7666 return StmtError();
7667 StmtResult ReturnStmt = S.BuildReturnStmt(Loc, RetVal.get());
7668 if (ReturnStmt.isInvalid())
7669 return StmtError();
7670 Stmts.Stmts.push_back(ReturnStmt.get());
7671
7672 return S.ActOnCompoundStmt(Loc, Loc, Stmts.Stmts, /*IsStmtExpr=*/false);
7673 }
7674
7675private:
7676 ExprResult getDecl(ValueDecl *VD) {
7677 return S.BuildDeclarationNameExpr(
7678 CXXScopeSpec(), DeclarationNameInfo(VD->getDeclName(), Loc), VD);
7679 }
7680
7681 ExprResult getParam(unsigned I) {
7682 ParmVarDecl *PD = FD->getParamDecl(I);
7683 return getDecl(PD);
7684 }
7685
7686 ExprPair getCompleteObject() {
7687 unsigned Param = 0;
7688 ExprResult LHS;
7689 if (isa<CXXMethodDecl>(FD)) {
7690 // LHS is '*this'.
7691 LHS = S.ActOnCXXThis(Loc);
7692 if (!LHS.isInvalid())
7693 LHS = S.CreateBuiltinUnaryOp(Loc, UO_Deref, LHS.get());
7694 } else {
7695 LHS = getParam(Param++);
7696 }
7697 ExprResult RHS = getParam(Param++);
7698 assert(Param == FD->getNumParams())((Param == FD->getNumParams()) ? static_cast<void> (
0) : __assert_fail ("Param == FD->getNumParams()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 7698, __PRETTY_FUNCTION__))
;
7699 return {LHS, RHS};
7700 }
7701
7702 ExprPair getBase(CXXBaseSpecifier *Base) {
7703 ExprPair Obj = getCompleteObject();
7704 if (Obj.first.isInvalid() || Obj.second.isInvalid())
7705 return {ExprError(), ExprError()};
7706 CXXCastPath Path = {Base};
7707 return {S.ImpCastExprToType(Obj.first.get(), Base->getType(),
7708 CK_DerivedToBase, VK_LValue, &Path),
7709 S.ImpCastExprToType(Obj.second.get(), Base->getType(),
7710 CK_DerivedToBase, VK_LValue, &Path)};
7711 }
7712
7713 ExprPair getField(FieldDecl *Field) {
7714 ExprPair Obj = getCompleteObject();
7715 if (Obj.first.isInvalid() || Obj.second.isInvalid())
7716 return {ExprError(), ExprError()};
7717
7718 DeclAccessPair Found = DeclAccessPair::make(Field, Field->getAccess());
7719 DeclarationNameInfo NameInfo(Field->getDeclName(), Loc);
7720 return {S.BuildFieldReferenceExpr(Obj.first.get(), /*IsArrow=*/false, Loc,
7721 CXXScopeSpec(), Field, Found, NameInfo),
7722 S.BuildFieldReferenceExpr(Obj.second.get(), /*IsArrow=*/false, Loc,
7723 CXXScopeSpec(), Field, Found, NameInfo)};
7724 }
7725
7726 // FIXME: When expanding a subobject, register a note in the code synthesis
7727 // stack to say which subobject we're comparing.
7728
7729 StmtResult buildIfNotCondReturnFalse(ExprResult Cond) {
7730 if (Cond.isInvalid())
7731 return StmtError();
7732
7733 ExprResult NotCond = S.CreateBuiltinUnaryOp(Loc, UO_LNot, Cond.get());
7734 if (NotCond.isInvalid())
7735 return StmtError();
7736
7737 ExprResult False = S.ActOnCXXBoolLiteral(Loc, tok::kw_false);
7738 assert(!False.isInvalid() && "should never fail")((!False.isInvalid() && "should never fail") ? static_cast
<void> (0) : __assert_fail ("!False.isInvalid() && \"should never fail\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 7738, __PRETTY_FUNCTION__))
;
7739 StmtResult ReturnFalse = S.BuildReturnStmt(Loc, False.get());
7740 if (ReturnFalse.isInvalid())
7741 return StmtError();
7742
7743 return S.ActOnIfStmt(Loc, false, nullptr,
7744 S.ActOnCondition(nullptr, Loc, NotCond.get(),
7745 Sema::ConditionKind::Boolean),
7746 ReturnFalse.get(), SourceLocation(), nullptr);
7747 }
7748
7749 StmtResult visitSubobjectArray(QualType Type, llvm::APInt Size,
7750 ExprPair Subobj) {
7751 QualType SizeType = S.Context.getSizeType();
7752 Size = Size.zextOrTrunc(S.Context.getTypeSize(SizeType));
7753
7754 // Build 'size_t i$n = 0'.
7755 IdentifierInfo *IterationVarName = nullptr;
7756 {
7757 SmallString<8> Str;
7758 llvm::raw_svector_ostream OS(Str);
7759 OS << "i" << ArrayDepth;
7760 IterationVarName = &S.Context.Idents.get(OS.str());
7761 }
7762 VarDecl *IterationVar = VarDecl::Create(
7763 S.Context, S.CurContext, Loc, Loc, IterationVarName, SizeType,
7764 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), SC_None);
7765 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0);
7766 IterationVar->setInit(
7767 IntegerLiteral::Create(S.Context, Zero, SizeType, Loc));
7768 Stmt *Init = new (S.Context) DeclStmt(DeclGroupRef(IterationVar), Loc, Loc);
7769
7770 auto IterRef = [&] {
7771 ExprResult Ref = S.BuildDeclarationNameExpr(
7772 CXXScopeSpec(), DeclarationNameInfo(IterationVarName, Loc),
7773 IterationVar);
7774 assert(!Ref.isInvalid() && "can't reference our own variable?")((!Ref.isInvalid() && "can't reference our own variable?"
) ? static_cast<void> (0) : __assert_fail ("!Ref.isInvalid() && \"can't reference our own variable?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 7774, __PRETTY_FUNCTION__))
;
7775 return Ref.get();
7776 };
7777
7778 // Build 'i$n != Size'.
7779 ExprResult Cond = S.CreateBuiltinBinOp(
7780 Loc, BO_NE, IterRef(),
7781 IntegerLiteral::Create(S.Context, Size, SizeType, Loc));
7782 assert(!Cond.isInvalid() && "should never fail")((!Cond.isInvalid() && "should never fail") ? static_cast
<void> (0) : __assert_fail ("!Cond.isInvalid() && \"should never fail\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 7782, __PRETTY_FUNCTION__))
;
7783
7784 // Build '++i$n'.
7785 ExprResult Inc = S.CreateBuiltinUnaryOp(Loc, UO_PreInc, IterRef());
7786 assert(!Inc.isInvalid() && "should never fail")((!Inc.isInvalid() && "should never fail") ? static_cast
<void> (0) : __assert_fail ("!Inc.isInvalid() && \"should never fail\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 7786, __PRETTY_FUNCTION__))
;
7787
7788 // Build 'a[i$n]' and 'b[i$n]'.
7789 auto Index = [&](ExprResult E) {
7790 if (E.isInvalid())
7791 return ExprError();
7792 return S.CreateBuiltinArraySubscriptExpr(E.get(), Loc, IterRef(), Loc);
7793 };
7794 Subobj.first = Index(Subobj.first);
7795 Subobj.second = Index(Subobj.second);
7796
7797 // Compare the array elements.
7798 ++ArrayDepth;
7799 StmtResult Substmt = visitSubobject(Type, Subobj);
7800 --ArrayDepth;
7801
7802 if (Substmt.isInvalid())
7803 return StmtError();
7804
7805 // For the inner level of an 'operator==', build 'if (!cmp) return false;'.
7806 // For outer levels or for an 'operator<=>' we already have a suitable
7807 // statement that returns as necessary.
7808 if (Expr *ElemCmp = dyn_cast<Expr>(Substmt.get())) {
7809 assert(DCK == DefaultedComparisonKind::Equal &&((DCK == DefaultedComparisonKind::Equal && "should have non-expression statement"
) ? static_cast<void> (0) : __assert_fail ("DCK == DefaultedComparisonKind::Equal && \"should have non-expression statement\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 7810, __PRETTY_FUNCTION__))
7810 "should have non-expression statement")((DCK == DefaultedComparisonKind::Equal && "should have non-expression statement"
) ? static_cast<void> (0) : __assert_fail ("DCK == DefaultedComparisonKind::Equal && \"should have non-expression statement\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 7810, __PRETTY_FUNCTION__))
;
7811 Substmt = buildIfNotCondReturnFalse(ElemCmp);
7812 if (Substmt.isInvalid())
7813 return StmtError();
7814 }
7815
7816 // Build 'for (...) ...'
7817 return S.ActOnForStmt(Loc, Loc, Init,
7818 S.ActOnCondition(nullptr, Loc, Cond.get(),
7819 Sema::ConditionKind::Boolean),
7820 S.MakeFullDiscardedValueExpr(Inc.get()), Loc,
7821 Substmt.get());
7822 }
7823
7824 StmtResult visitExpandedSubobject(QualType Type, ExprPair Obj) {
7825 if (Obj.first.isInvalid() || Obj.second.isInvalid())
7826 return StmtError();
7827
7828 OverloadedOperatorKind OO = FD->getOverloadedOperator();
7829 ExprResult Op = S.CreateOverloadedBinOp(
7830 Loc, BinaryOperator::getOverloadedOpcode(OO), Fns,
7831 Obj.first.get(), Obj.second.get(), /*PerformADL=*/true,
7832 /*AllowRewrittenCandidates=*/true, FD);
7833 if (Op.isInvalid())
7834 return StmtError();
7835
7836 switch (DCK) {
7837 case DefaultedComparisonKind::None:
7838 llvm_unreachable("not a defaulted comparison")::llvm::llvm_unreachable_internal("not a defaulted comparison"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 7838)
;
7839
7840 case DefaultedComparisonKind::Equal:
7841 // Per C++2a [class.eq]p2, each comparison is individually contextually
7842 // converted to bool.
7843 Op = S.PerformContextuallyConvertToBool(Op.get());
7844 if (Op.isInvalid())
7845 return StmtError();
7846 return Op.get();
7847
7848 case DefaultedComparisonKind::ThreeWay: {
7849 // Per C++2a [class.spaceship]p3, form:
7850 // if (R cmp = static_cast<R>(op); cmp != 0)
7851 // return cmp;
7852 QualType R = FD->getReturnType();
7853 Op = buildStaticCastToR(Op.get());
7854 if (Op.isInvalid())
7855 return StmtError();
7856
7857 // R cmp = ...;
7858 IdentifierInfo *Name = &S.Context.Idents.get("cmp");
7859 VarDecl *VD =
7860 VarDecl::Create(S.Context, S.CurContext, Loc, Loc, Name, R,
7861 S.Context.getTrivialTypeSourceInfo(R, Loc), SC_None);
7862 S.AddInitializerToDecl(VD, Op.get(), /*DirectInit=*/false);
7863 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(VD), Loc, Loc);
7864
7865 // cmp != 0
7866 ExprResult VDRef = getDecl(VD);
7867 if (VDRef.isInvalid())
7868 return StmtError();
7869 llvm::APInt ZeroVal(S.Context.getIntWidth(S.Context.IntTy), 0);
7870 Expr *Zero =
7871 IntegerLiteral::Create(S.Context, ZeroVal, S.Context.IntTy, Loc);
7872 ExprResult Comp = S.CreateOverloadedBinOp(Loc, BO_NE, Fns, VDRef.get(),
7873 Zero, true, true, FD);
7874 if (Comp.isInvalid())
7875 return StmtError();
7876 Sema::ConditionResult Cond = S.ActOnCondition(
7877 nullptr, Loc, Comp.get(), Sema::ConditionKind::Boolean);
7878 if (Cond.isInvalid())
7879 return StmtError();
7880
7881 // return cmp;
7882 VDRef = getDecl(VD);
7883 if (VDRef.isInvalid())
7884 return StmtError();
7885 StmtResult ReturnStmt = S.BuildReturnStmt(Loc, VDRef.get());
7886 if (ReturnStmt.isInvalid())
7887 return StmtError();
7888
7889 // if (...)
7890 return S.ActOnIfStmt(Loc, /*IsConstexpr=*/false, InitStmt, Cond,
7891 ReturnStmt.get(), /*ElseLoc=*/SourceLocation(),
7892 /*Else=*/nullptr);
7893 }
7894
7895 case DefaultedComparisonKind::NotEqual:
7896 case DefaultedComparisonKind::Relational:
7897 // C++2a [class.compare.secondary]p2:
7898 // Otherwise, the operator function yields x @ y.
7899 return Op.get();
7900 }
7901 llvm_unreachable("")::llvm::llvm_unreachable_internal("", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 7901)
;
7902 }
7903
7904 /// Build "static_cast<R>(E)".
7905 ExprResult buildStaticCastToR(Expr *E) {
7906 QualType R = FD->getReturnType();
7907 assert(!R->isUndeducedType() && "type should have been deduced already")((!R->isUndeducedType() && "type should have been deduced already"
) ? static_cast<void> (0) : __assert_fail ("!R->isUndeducedType() && \"type should have been deduced already\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 7907, __PRETTY_FUNCTION__))
;
7908
7909 // Don't bother forming a no-op cast in the common case.
7910 if (E->isRValue() && S.Context.hasSameType(E->getType(), R))
7911 return E;
7912 return S.BuildCXXNamedCast(Loc, tok::kw_static_cast,
7913 S.Context.getTrivialTypeSourceInfo(R, Loc), E,
7914 SourceRange(Loc, Loc), SourceRange(Loc, Loc));
7915 }
7916};
7917}
7918
7919/// Perform the unqualified lookups that might be needed to form a defaulted
7920/// comparison function for the given operator.
7921static void lookupOperatorsForDefaultedComparison(Sema &Self, Scope *S,
7922 UnresolvedSetImpl &Operators,
7923 OverloadedOperatorKind Op) {
7924 auto Lookup = [&](OverloadedOperatorKind OO) {
7925 Self.LookupOverloadedOperatorName(OO, S, QualType(), QualType(), Operators);
7926 };
7927
7928 // Every defaulted operator looks up itself.
7929 Lookup(Op);
7930 // ... and the rewritten form of itself, if any.
7931 if (OverloadedOperatorKind ExtraOp = getRewrittenOverloadedOperator(Op))
7932 Lookup(ExtraOp);
7933
7934 // For 'operator<=>', we also form a 'cmp != 0' expression, and might
7935 // synthesize a three-way comparison from '<' and '=='. In a dependent
7936 // context, we also need to look up '==' in case we implicitly declare a
7937 // defaulted 'operator=='.
7938 if (Op == OO_Spaceship) {
7939 Lookup(OO_ExclaimEqual);
7940 Lookup(OO_Less);
7941 Lookup(OO_EqualEqual);
7942 }
7943}
7944
7945bool Sema::CheckExplicitlyDefaultedComparison(Scope *S, FunctionDecl *FD,
7946 DefaultedComparisonKind DCK) {
7947 assert(DCK != DefaultedComparisonKind::None && "not a defaulted comparison")((DCK != DefaultedComparisonKind::None && "not a defaulted comparison"
) ? static_cast<void> (0) : __assert_fail ("DCK != DefaultedComparisonKind::None && \"not a defaulted comparison\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 7947, __PRETTY_FUNCTION__))
;
7948
7949 CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(FD->getLexicalDeclContext());
7950 assert(RD && "defaulted comparison is not defaulted in a class")((RD && "defaulted comparison is not defaulted in a class"
) ? static_cast<void> (0) : __assert_fail ("RD && \"defaulted comparison is not defaulted in a class\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 7950, __PRETTY_FUNCTION__))
;
7951
7952 // Perform any unqualified lookups we're going to need to default this
7953 // function.
7954 if (S) {
7955 UnresolvedSet<32> Operators;
7956 lookupOperatorsForDefaultedComparison(*this, S, Operators,
7957 FD->getOverloadedOperator());
7958 FD->setDefaultedFunctionInfo(FunctionDecl::DefaultedFunctionInfo::Create(
7959 Context, Operators.pairs()));
7960 }
7961
7962 // C++2a [class.compare.default]p1:
7963 // A defaulted comparison operator function for some class C shall be a
7964 // non-template function declared in the member-specification of C that is
7965 // -- a non-static const member of C having one parameter of type
7966 // const C&, or
7967 // -- a friend of C having two parameters of type const C& or two
7968 // parameters of type C.
7969 QualType ExpectedParmType1 = Context.getRecordType(RD);
7970 QualType ExpectedParmType2 =
7971 Context.getLValueReferenceType(ExpectedParmType1.withConst());
7972 if (isa<CXXMethodDecl>(FD))
7973 ExpectedParmType1 = ExpectedParmType2;
7974 for (const ParmVarDecl *Param : FD->parameters()) {
7975 if (!Param->getType()->isDependentType() &&
7976 !Context.hasSameType(Param->getType(), ExpectedParmType1) &&
7977 !Context.hasSameType(Param->getType(), ExpectedParmType2)) {
7978 // Don't diagnose an implicit 'operator=='; we will have diagnosed the
7979 // corresponding defaulted 'operator<=>' already.
7980 if (!FD->isImplicit()) {
7981 Diag(FD->getLocation(), diag::err_defaulted_comparison_param)
7982 << (int)DCK << Param->getType() << ExpectedParmType1
7983 << !isa<CXXMethodDecl>(FD)
7984 << ExpectedParmType2 << Param->getSourceRange();
7985 }
7986 return true;
7987 }
7988 }
7989 if (FD->getNumParams() == 2 &&
7990 !Context.hasSameType(FD->getParamDecl(0)->getType(),
7991 FD->getParamDecl(1)->getType())) {
7992 if (!FD->isImplicit()) {
7993 Diag(FD->getLocation(), diag::err_defaulted_comparison_param_mismatch)
7994 << (int)DCK
7995 << FD->getParamDecl(0)->getType()
7996 << FD->getParamDecl(0)->getSourceRange()
7997 << FD->getParamDecl(1)->getType()
7998 << FD->getParamDecl(1)->getSourceRange();
7999 }
8000 return true;
8001 }
8002
8003 // ... non-static const member ...
8004 if (auto *MD = dyn_cast<CXXMethodDecl>(FD)) {
8005 assert(!MD->isStatic() && "comparison function cannot be a static member")((!MD->isStatic() && "comparison function cannot be a static member"
) ? static_cast<void> (0) : __assert_fail ("!MD->isStatic() && \"comparison function cannot be a static member\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 8005, __PRETTY_FUNCTION__))
;
8006 if (!MD->isConst()) {
8007 SourceLocation InsertLoc;
8008 if (FunctionTypeLoc Loc = MD->getFunctionTypeLoc())
8009 InsertLoc = getLocForEndOfToken(Loc.getRParenLoc());
8010 // Don't diagnose an implicit 'operator=='; we will have diagnosed the
8011 // corresponding defaulted 'operator<=>' already.
8012 if (!MD->isImplicit()) {
8013 Diag(MD->getLocation(), diag::err_defaulted_comparison_non_const)
8014 << (int)DCK << FixItHint::CreateInsertion(InsertLoc, " const");
8015 }
8016
8017 // Add the 'const' to the type to recover.
8018 const auto *FPT = MD->getType()->castAs<FunctionProtoType>();
8019 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
8020 EPI.TypeQuals.addConst();
8021 MD->setType(Context.getFunctionType(FPT->getReturnType(),
8022 FPT->getParamTypes(), EPI));
8023 }
8024 } else {
8025 // A non-member function declared in a class must be a friend.
8026 assert(FD->getFriendObjectKind() && "expected a friend declaration")((FD->getFriendObjectKind() && "expected a friend declaration"
) ? static_cast<void> (0) : __assert_fail ("FD->getFriendObjectKind() && \"expected a friend declaration\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 8026, __PRETTY_FUNCTION__))
;
8027 }
8028
8029 // C++2a [class.eq]p1, [class.rel]p1:
8030 // A [defaulted comparison other than <=>] shall have a declared return
8031 // type bool.
8032 if (DCK != DefaultedComparisonKind::ThreeWay &&
8033 !FD->getDeclaredReturnType()->isDependentType() &&
8034 !Context.hasSameType(FD->getDeclaredReturnType(), Context.BoolTy)) {
8035 Diag(FD->getLocation(), diag::err_defaulted_comparison_return_type_not_bool)
8036 << (int)DCK << FD->getDeclaredReturnType() << Context.BoolTy
8037 << FD->getReturnTypeSourceRange();
8038 return true;
8039 }
8040 // C++2a [class.spaceship]p2 [P2002R0]:
8041 // Let R be the declared return type [...]. If R is auto, [...]. Otherwise,
8042 // R shall not contain a placeholder type.
8043 if (DCK == DefaultedComparisonKind::ThreeWay &&
8044 FD->getDeclaredReturnType()->getContainedDeducedType() &&
8045 !Context.hasSameType(FD->getDeclaredReturnType(),
8046 Context.getAutoDeductType())) {
8047 Diag(FD->getLocation(),
8048 diag::err_defaulted_comparison_deduced_return_type_not_auto)
8049 << (int)DCK << FD->getDeclaredReturnType() << Context.AutoDeductTy
8050 << FD->getReturnTypeSourceRange();
8051 return true;
8052 }
8053
8054 // For a defaulted function in a dependent class, defer all remaining checks
8055 // until instantiation.
8056 if (RD->isDependentType())
8057 return false;
8058
8059 // Determine whether the function should be defined as deleted.
8060 DefaultedComparisonInfo Info =
8061 DefaultedComparisonAnalyzer(*this, RD, FD, DCK).visit();
8062
8063 bool First = FD == FD->getCanonicalDecl();
8064
8065 // If we want to delete the function, then do so; there's nothing else to
8066 // check in that case.
8067 if (Info.Deleted) {
8068 if (!First) {
8069 // C++11 [dcl.fct.def.default]p4:
8070 // [For a] user-provided explicitly-defaulted function [...] if such a
8071 // function is implicitly defined as deleted, the program is ill-formed.
8072 //
8073 // This is really just a consequence of the general rule that you can
8074 // only delete a function on its first declaration.
8075 Diag(FD->getLocation(), diag::err_non_first_default_compare_deletes)
8076 << FD->isImplicit() << (int)DCK;
8077 DefaultedComparisonAnalyzer(*this, RD, FD, DCK,
8078 DefaultedComparisonAnalyzer::ExplainDeleted)
8079 .visit();
8080 return true;
8081 }
8082
8083 SetDeclDeleted(FD, FD->getLocation());
8084 if (!inTemplateInstantiation() && !FD->isImplicit()) {
8085 Diag(FD->getLocation(), diag::warn_defaulted_comparison_deleted)
8086 << (int)DCK;
8087 DefaultedComparisonAnalyzer(*this, RD, FD, DCK,
8088 DefaultedComparisonAnalyzer::ExplainDeleted)
8089 .visit();
8090 }
8091 return false;
8092 }
8093
8094 // C++2a [class.spaceship]p2:
8095 // The return type is deduced as the common comparison type of R0, R1, ...
8096 if (DCK == DefaultedComparisonKind::ThreeWay &&
8097 FD->getDeclaredReturnType()->isUndeducedAutoType()) {
8098 SourceLocation RetLoc = FD->getReturnTypeSourceRange().getBegin();
8099 if (RetLoc.isInvalid())
8100 RetLoc = FD->getBeginLoc();
8101 // FIXME: Should we really care whether we have the complete type and the
8102 // 'enumerator' constants here? A forward declaration seems sufficient.
8103 QualType Cat = CheckComparisonCategoryType(
8104 Info.Category, RetLoc, ComparisonCategoryUsage::DefaultedOperator);
8105 if (Cat.isNull())
8106 return true;
8107 Context.adjustDeducedFunctionResultType(
8108 FD, SubstAutoType(FD->getDeclaredReturnType(), Cat));
8109 }
8110
8111 // C++2a [dcl.fct.def.default]p3 [P2002R0]:
8112 // An explicitly-defaulted function that is not defined as deleted may be
8113 // declared constexpr or consteval only if it is constexpr-compatible.
8114 // C++2a [class.compare.default]p3 [P2002R0]:
8115 // A defaulted comparison function is constexpr-compatible if it satisfies
8116 // the requirements for a constexpr function [...]
8117 // The only relevant requirements are that the parameter and return types are
8118 // literal types. The remaining conditions are checked by the analyzer.
8119 if (FD->isConstexpr()) {
8120 if (CheckConstexprReturnType(*this, FD, CheckConstexprKind::Diagnose) &&
8121 CheckConstexprParameterTypes(*this, FD, CheckConstexprKind::Diagnose) &&
8122 !Info.Constexpr) {
8123 Diag(FD->getBeginLoc(),
8124 diag::err_incorrect_defaulted_comparison_constexpr)
8125 << FD->isImplicit() << (int)DCK << FD->isConsteval();
8126 DefaultedComparisonAnalyzer(*this, RD, FD, DCK,
8127 DefaultedComparisonAnalyzer::ExplainConstexpr)
8128 .visit();
8129 }
8130 }
8131
8132 // C++2a [dcl.fct.def.default]p3 [P2002R0]:
8133 // If a constexpr-compatible function is explicitly defaulted on its first
8134 // declaration, it is implicitly considered to be constexpr.
8135 // FIXME: Only applying this to the first declaration seems problematic, as
8136 // simple reorderings can affect the meaning of the program.
8137 if (First && !FD->isConstexpr() && Info.Constexpr)
8138 FD->setConstexprKind(CSK_constexpr);
8139
8140 // C++2a [except.spec]p3:
8141 // If a declaration of a function does not have a noexcept-specifier
8142 // [and] is defaulted on its first declaration, [...] the exception
8143 // specification is as specified below
8144 if (FD->getExceptionSpecType() == EST_None) {
8145 auto *FPT = FD->getType()->castAs<FunctionProtoType>();
8146 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
8147 EPI.ExceptionSpec.Type = EST_Unevaluated;
8148 EPI.ExceptionSpec.SourceDecl = FD;
8149 FD->setType(Context.getFunctionType(FPT->getReturnType(),
8150 FPT->getParamTypes(), EPI));
8151 }
8152
8153 return false;
8154}
8155
8156void Sema::DeclareImplicitEqualityComparison(CXXRecordDecl *RD,
8157 FunctionDecl *Spaceship) {
8158 Sema::CodeSynthesisContext Ctx;
8159 Ctx.Kind = Sema::CodeSynthesisContext::DeclaringImplicitEqualityComparison;
8160 Ctx.PointOfInstantiation = Spaceship->getEndLoc();
8161 Ctx.Entity = Spaceship;
8162 pushCodeSynthesisContext(Ctx);
8163
8164 if (FunctionDecl *EqualEqual = SubstSpaceshipAsEqualEqual(RD, Spaceship))
8165 EqualEqual->setImplicit();
8166
8167 popCodeSynthesisContext();
8168}
8169
8170void Sema::DefineDefaultedComparison(SourceLocation UseLoc, FunctionDecl *FD,
8171 DefaultedComparisonKind DCK) {
8172 assert(FD->isDefaulted() && !FD->isDeleted() &&((FD->isDefaulted() && !FD->isDeleted() &&
!FD->doesThisDeclarationHaveABody()) ? static_cast<void
> (0) : __assert_fail ("FD->isDefaulted() && !FD->isDeleted() && !FD->doesThisDeclarationHaveABody()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 8173, __PRETTY_FUNCTION__))
8173 !FD->doesThisDeclarationHaveABody())((FD->isDefaulted() && !FD->isDeleted() &&
!FD->doesThisDeclarationHaveABody()) ? static_cast<void
> (0) : __assert_fail ("FD->isDefaulted() && !FD->isDeleted() && !FD->doesThisDeclarationHaveABody()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 8173, __PRETTY_FUNCTION__))
;
8174 if (FD->willHaveBody() || FD->isInvalidDecl())
8175 return;
8176
8177 SynthesizedFunctionScope Scope(*this, FD);
8178
8179 // Add a context note for diagnostics produced after this point.
8180 Scope.addContextNote(UseLoc);
8181
8182 {
8183 // Build and set up the function body.
8184 CXXRecordDecl *RD = cast<CXXRecordDecl>(FD->getLexicalParent());
8185 SourceLocation BodyLoc =
8186 FD->getEndLoc().isValid() ? FD->getEndLoc() : FD->getLocation();
8187 StmtResult Body =
8188 DefaultedComparisonSynthesizer(*this, RD, FD, DCK, BodyLoc).build();
8189 if (Body.isInvalid()) {
8190 FD->setInvalidDecl();
8191 return;
8192 }
8193 FD->setBody(Body.get());
8194 FD->markUsed(Context);
8195 }
8196
8197 // The exception specification is needed because we are defining the
8198 // function. Note that this will reuse the body we just built.
8199 ResolveExceptionSpec(UseLoc, FD->getType()->castAs<FunctionProtoType>());
8200
8201 if (ASTMutationListener *L = getASTMutationListener())
8202 L->CompletedImplicitDefinition(FD);
8203}
8204
8205static Sema::ImplicitExceptionSpecification
8206ComputeDefaultedComparisonExceptionSpec(Sema &S, SourceLocation Loc,
8207 FunctionDecl *FD,
8208 Sema::DefaultedComparisonKind DCK) {
8209 ComputingExceptionSpec CES(S, FD, Loc);
8210 Sema::ImplicitExceptionSpecification ExceptSpec(S);
8211
8212 if (FD->isInvalidDecl())
8213 return ExceptSpec;
8214
8215 // The common case is that we just defined the comparison function. In that
8216 // case, just look at whether the body can throw.
8217 if (FD->hasBody()) {
8218 ExceptSpec.CalledStmt(FD->getBody());
8219 } else {
8220 // Otherwise, build a body so we can check it. This should ideally only
8221 // happen when we're not actually marking the function referenced. (This is
8222 // only really important for efficiency: we don't want to build and throw
8223 // away bodies for comparison functions more than we strictly need to.)
8224
8225 // Pretend to synthesize the function body in an unevaluated context.
8226 // Note that we can't actually just go ahead and define the function here:
8227 // we are not permitted to mark its callees as referenced.
8228 Sema::SynthesizedFunctionScope Scope(S, FD);
8229 EnterExpressionEvaluationContext Context(
8230 S, Sema::ExpressionEvaluationContext::Unevaluated);
8231
8232 CXXRecordDecl *RD = cast<CXXRecordDecl>(FD->getLexicalParent());
8233 SourceLocation BodyLoc =
8234 FD->getEndLoc().isValid() ? FD->getEndLoc() : FD->getLocation();
8235 StmtResult Body =
8236 DefaultedComparisonSynthesizer(S, RD, FD, DCK, BodyLoc).build();
8237 if (!Body.isInvalid())
8238 ExceptSpec.CalledStmt(Body.get());
8239
8240 // FIXME: Can we hold onto this body and just transform it to potentially
8241 // evaluated when we're asked to define the function rather than rebuilding
8242 // it? Either that, or we should only build the bits of the body that we
8243 // need (the expressions, not the statements).
8244 }
8245
8246 return ExceptSpec;
8247}
8248
8249void Sema::CheckDelayedMemberExceptionSpecs() {
8250 decltype(DelayedOverridingExceptionSpecChecks) Overriding;
8251 decltype(DelayedEquivalentExceptionSpecChecks) Equivalent;
8252
8253 std::swap(Overriding, DelayedOverridingExceptionSpecChecks);
8254 std::swap(Equivalent, DelayedEquivalentExceptionSpecChecks);
8255
8256 // Perform any deferred checking of exception specifications for virtual
8257 // destructors.
8258 for (auto &Check : Overriding)
8259 CheckOverridingFunctionExceptionSpec(Check.first, Check.second);
8260
8261 // Perform any deferred checking of exception specifications for befriended
8262 // special members.
8263 for (auto &Check : Equivalent)
8264 CheckEquivalentExceptionSpec(Check.second, Check.first);
8265}
8266
8267namespace {
8268/// CRTP base class for visiting operations performed by a special member
8269/// function (or inherited constructor).
8270template<typename Derived>
8271struct SpecialMemberVisitor {
8272 Sema &S;
8273 CXXMethodDecl *MD;
8274 Sema::CXXSpecialMember CSM;
8275 Sema::InheritedConstructorInfo *ICI;
8276
8277 // Properties of the special member, computed for convenience.
8278 bool IsConstructor = false, IsAssignment = false, ConstArg = false;
8279
8280 SpecialMemberVisitor(Sema &S, CXXMethodDecl *MD, Sema::CXXSpecialMember CSM,
8281 Sema::InheritedConstructorInfo *ICI)
8282 : S(S), MD(MD), CSM(CSM), ICI(ICI) {
8283 switch (CSM) {
8284 case Sema::CXXDefaultConstructor:
8285 case Sema::CXXCopyConstructor:
8286 case Sema::CXXMoveConstructor:
8287 IsConstructor = true;
8288 break;
8289 case Sema::CXXCopyAssignment:
8290 case Sema::CXXMoveAssignment:
8291 IsAssignment = true;
8292 break;
8293 case Sema::CXXDestructor:
8294 break;
8295 case Sema::CXXInvalid:
8296 llvm_unreachable("invalid special member kind")::llvm::llvm_unreachable_internal("invalid special member kind"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 8296)
;
8297 }
8298
8299 if (MD->getNumParams()) {
8300 if (const ReferenceType *RT =
8301 MD->getParamDecl(0)->getType()->getAs<ReferenceType>())
8302 ConstArg = RT->getPointeeType().isConstQualified();
8303 }
8304 }
8305
8306 Derived &getDerived() { return static_cast<Derived&>(*this); }
8307
8308 /// Is this a "move" special member?
8309 bool isMove() const {
8310 return CSM == Sema::CXXMoveConstructor || CSM == Sema::CXXMoveAssignment;
8311 }
8312
8313 /// Look up the corresponding special member in the given class.
8314 Sema::SpecialMemberOverloadResult lookupIn(CXXRecordDecl *Class,
8315 unsigned Quals, bool IsMutable) {
8316 return lookupCallFromSpecialMember(S, Class, CSM, Quals,
8317 ConstArg && !IsMutable);
8318 }
8319
8320 /// Look up the constructor for the specified base class to see if it's
8321 /// overridden due to this being an inherited constructor.
8322 Sema::SpecialMemberOverloadResult lookupInheritedCtor(CXXRecordDecl *Class) {
8323 if (!ICI)
8324 return {};
8325 assert(CSM == Sema::CXXDefaultConstructor)((CSM == Sema::CXXDefaultConstructor) ? static_cast<void>
(0) : __assert_fail ("CSM == Sema::CXXDefaultConstructor", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 8325, __PRETTY_FUNCTION__))
;
8326 auto *BaseCtor =
8327 cast<CXXConstructorDecl>(MD)->getInheritedConstructor().getConstructor();
8328 if (auto *MD = ICI->findConstructorForBase(Class, BaseCtor).first)
8329 return MD;
8330 return {};
8331 }
8332
8333 /// A base or member subobject.
8334 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject;
8335
8336 /// Get the location to use for a subobject in diagnostics.
8337 static SourceLocation getSubobjectLoc(Subobject Subobj) {
8338 // FIXME: For an indirect virtual base, the direct base leading to
8339 // the indirect virtual base would be a more useful choice.
8340 if (auto *B = Subobj.dyn_cast<CXXBaseSpecifier*>())
8341 return B->getBaseTypeLoc();
8342 else
8343 return Subobj.get<FieldDecl*>()->getLocation();
8344 }
8345
8346 enum BasesToVisit {
8347 /// Visit all non-virtual (direct) bases.
8348 VisitNonVirtualBases,
8349 /// Visit all direct bases, virtual or not.
8350 VisitDirectBases,
8351 /// Visit all non-virtual bases, and all virtual bases if the class
8352 /// is not abstract.
8353 VisitPotentiallyConstructedBases,
8354 /// Visit all direct or virtual bases.
8355 VisitAllBases
8356 };
8357
8358 // Visit the bases and members of the class.
8359 bool visit(BasesToVisit Bases) {
8360 CXXRecordDecl *RD = MD->getParent();
8361
8362 if (Bases == VisitPotentiallyConstructedBases)
8363 Bases = RD->isAbstract() ? VisitNonVirtualBases : VisitAllBases;
8364
8365 for (auto &B : RD->bases())
8366 if ((Bases == VisitDirectBases || !B.isVirtual()) &&
8367 getDerived().visitBase(&B))
8368 return true;
8369
8370 if (Bases == VisitAllBases)
8371 for (auto &B : RD->vbases())
8372 if (getDerived().visitBase(&B))
8373 return true;
8374
8375 for (auto *F : RD->fields())
8376 if (!F->isInvalidDecl() && !F->isUnnamedBitfield() &&
8377 getDerived().visitField(F))
8378 return true;
8379
8380 return false;
8381 }
8382};
8383}
8384
8385namespace {
8386struct SpecialMemberDeletionInfo
8387 : SpecialMemberVisitor<SpecialMemberDeletionInfo> {
8388 bool Diagnose;
8389
8390 SourceLocation Loc;
8391
8392 bool AllFieldsAreConst;
8393
8394 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD,
8395 Sema::CXXSpecialMember CSM,
8396 Sema::InheritedConstructorInfo *ICI, bool Diagnose)
8397 : SpecialMemberVisitor(S, MD, CSM, ICI), Diagnose(Diagnose),
8398 Loc(MD->getLocation()), AllFieldsAreConst(true) {}
8399
8400 bool inUnion() const { return MD->getParent()->isUnion(); }
8401
8402 Sema::CXXSpecialMember getEffectiveCSM() {
8403 return ICI ? Sema::CXXInvalid : CSM;
8404 }
8405
8406 bool shouldDeleteForVariantObjCPtrMember(FieldDecl *FD, QualType FieldType);
8407
8408 bool visitBase(CXXBaseSpecifier *Base) { return shouldDeleteForBase(Base); }
8409 bool visitField(FieldDecl *Field) { return shouldDeleteForField(Field); }
8410
8411 bool shouldDeleteForBase(CXXBaseSpecifier *Base);
8412 bool shouldDeleteForField(FieldDecl *FD);
8413 bool shouldDeleteForAllConstMembers();
8414
8415 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj,
8416 unsigned Quals);
8417 bool shouldDeleteForSubobjectCall(Subobject Subobj,
8418 Sema::SpecialMemberOverloadResult SMOR,
8419 bool IsDtorCallInCtor);
8420
8421 bool isAccessible(Subobject Subobj, CXXMethodDecl *D);
8422};
8423}
8424
8425/// Is the given special member inaccessible when used on the given
8426/// sub-object.
8427bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj,
8428 CXXMethodDecl *target) {
8429 /// If we're operating on a base class, the object type is the
8430 /// type of this special member.
8431 QualType objectTy;
8432 AccessSpecifier access = target->getAccess();
8433 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) {
8434 objectTy = S.Context.getTypeDeclType(MD->getParent());
8435 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access);
8436
8437 // If we're operating on a field, the object type is the type of the field.
8438 } else {
8439 objectTy = S.Context.getTypeDeclType(target->getParent());
8440 }
8441
8442 return S.isMemberAccessibleForDeletion(
8443 target->getParent(), DeclAccessPair::make(target, access), objectTy);
8444}
8445
8446/// Check whether we should delete a special member due to the implicit
8447/// definition containing a call to a special member of a subobject.
8448bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall(
8449 Subobject Subobj, Sema::SpecialMemberOverloadResult SMOR,
8450 bool IsDtorCallInCtor) {
8451 CXXMethodDecl *Decl = SMOR.getMethod();
8452 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>();
8453
8454 int DiagKind = -1;
8455
8456 if (SMOR.getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted)
8457 DiagKind = !Decl ? 0 : 1;
8458 else if (SMOR.getKind() == Sema::SpecialMemberOverloadResult::Ambiguous)
8459 DiagKind = 2;
8460 else if (!isAccessible(Subobj, Decl))
8461 DiagKind = 3;
8462 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() &&
8463 !Decl->isTrivial()) {
8464 // A member of a union must have a trivial corresponding special member.
8465 // As a weird special case, a destructor call from a union's constructor
8466 // must be accessible and non-deleted, but need not be trivial. Such a
8467 // destructor is never actually called, but is semantically checked as
8468 // if it were.
8469 DiagKind = 4;
8470 }
8471
8472 if (DiagKind == -1)
8473 return false;
8474
8475 if (Diagnose) {
8476 if (Field) {
8477 S.Diag(Field->getLocation(),
8478 diag::note_deleted_special_member_class_subobject)
8479 << getEffectiveCSM() << MD->getParent() << /*IsField*/true
8480 << Field << DiagKind << IsDtorCallInCtor << /*IsObjCPtr*/false;
8481 } else {
8482 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>();
8483 S.Diag(Base->getBeginLoc(),
8484 diag::note_deleted_special_member_class_subobject)
8485 << getEffectiveCSM() << MD->getParent() << /*IsField*/ false
8486 << Base->getType() << DiagKind << IsDtorCallInCtor
8487 << /*IsObjCPtr*/false;
8488 }
8489
8490 if (DiagKind == 1)
8491 S.NoteDeletedFunction(Decl);
8492 // FIXME: Explain inaccessibility if DiagKind == 3.
8493 }
8494
8495 return true;
8496}
8497
8498/// Check whether we should delete a special member function due to having a
8499/// direct or virtual base class or non-static data member of class type M.
8500bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject(
8501 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) {
8502 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>();
8503 bool IsMutable = Field && Field->isMutable();
8504
8505 // C++11 [class.ctor]p5:
8506 // -- any direct or virtual base class, or non-static data member with no
8507 // brace-or-equal-initializer, has class type M (or array thereof) and
8508 // either M has no default constructor or overload resolution as applied
8509 // to M's default constructor results in an ambiguity or in a function
8510 // that is deleted or inaccessible
8511 // C++11 [class.copy]p11, C++11 [class.copy]p23:
8512 // -- a direct or virtual base class B that cannot be copied/moved because
8513 // overload resolution, as applied to B's corresponding special member,
8514 // results in an ambiguity or a function that is deleted or inaccessible
8515 // from the defaulted special member
8516 // C++11 [class.dtor]p5:
8517 // -- any direct or virtual base class [...] has a type with a destructor
8518 // that is deleted or inaccessible
8519 if (!(CSM == Sema::CXXDefaultConstructor &&
8520 Field && Field->hasInClassInitializer()) &&
8521 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals, IsMutable),
8522 false))
8523 return true;
8524
8525 // C++11 [class.ctor]p5, C++11 [class.copy]p11:
8526 // -- any direct or virtual base class or non-static data member has a
8527 // type with a destructor that is deleted or inaccessible
8528 if (IsConstructor) {
8529 Sema::SpecialMemberOverloadResult SMOR =
8530 S.LookupSpecialMember(Class, Sema::CXXDestructor,
8531 false, false, false, false, false);
8532 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true))
8533 return true;
8534 }
8535
8536 return false;
8537}
8538
8539bool SpecialMemberDeletionInfo::shouldDeleteForVariantObjCPtrMember(
8540 FieldDecl *FD, QualType FieldType) {
8541 // The defaulted special functions are defined as deleted if this is a variant
8542 // member with a non-trivial ownership type, e.g., ObjC __strong or __weak
8543 // type under ARC.
8544 if (!FieldType.hasNonTrivialObjCLifetime())
8545 return false;
8546
8547 // Don't make the defaulted default constructor defined as deleted if the
8548 // member has an in-class initializer.
8549 if (CSM == Sema::CXXDefaultConstructor && FD->hasInClassInitializer())
8550 return false;
8551
8552 if (Diagnose) {
8553 auto *ParentClass = cast<CXXRecordDecl>(FD->getParent());
8554 S.Diag(FD->getLocation(),
8555 diag::note_deleted_special_member_class_subobject)
8556 << getEffectiveCSM() << ParentClass << /*IsField*/true
8557 << FD << 4 << /*IsDtorCallInCtor*/false << /*IsObjCPtr*/true;
8558 }
8559
8560 return true;
8561}
8562
8563/// Check whether we should delete a special member function due to the class
8564/// having a particular direct or virtual base class.
8565bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) {
8566 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl();
8567 // If program is correct, BaseClass cannot be null, but if it is, the error
8568 // must be reported elsewhere.
8569 if (!BaseClass)
8570 return false;
8571 // If we have an inheriting constructor, check whether we're calling an
8572 // inherited constructor instead of a default constructor.
8573 Sema::SpecialMemberOverloadResult SMOR = lookupInheritedCtor(BaseClass);
8574 if (auto *BaseCtor = SMOR.getMethod()) {
8575 // Note that we do not check access along this path; other than that,
8576 // this is the same as shouldDeleteForSubobjectCall(Base, BaseCtor, false);
8577 // FIXME: Check that the base has a usable destructor! Sink this into
8578 // shouldDeleteForClassSubobject.
8579 if (BaseCtor->isDeleted() && Diagnose) {
8580 S.Diag(Base->getBeginLoc(),
8581 diag::note_deleted_special_member_class_subobject)
8582 << getEffectiveCSM() << MD->getParent() << /*IsField*/ false
8583 << Base->getType() << /*Deleted*/ 1 << /*IsDtorCallInCtor*/ false
8584 << /*IsObjCPtr*/false;
8585 S.NoteDeletedFunction(BaseCtor);
8586 }
8587 return BaseCtor->isDeleted();
8588 }
8589 return shouldDeleteForClassSubobject(BaseClass, Base, 0);
8590}
8591
8592/// Check whether we should delete a special member function due to the class
8593/// having a particular non-static data member.
8594bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) {
8595 QualType FieldType = S.Context.getBaseElementType(FD->getType());
8596 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl();
8597
8598 if (inUnion() && shouldDeleteForVariantObjCPtrMember(FD, FieldType))
8599 return true;
8600
8601 if (CSM == Sema::CXXDefaultConstructor) {
8602 // For a default constructor, all references must be initialized in-class
8603 // and, if a union, it must have a non-const member.
8604 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) {
8605 if (Diagnose)
8606 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field)
8607 << !!ICI << MD->getParent() << FD << FieldType << /*Reference*/0;
8608 return true;
8609 }
8610 // C++11 [class.ctor]p5: any non-variant non-static data member of
8611 // const-qualified type (or array thereof) with no
8612 // brace-or-equal-initializer does not have a user-provided default
8613 // constructor.
8614 if (!inUnion() && FieldType.isConstQualified() &&
8615 !FD->hasInClassInitializer() &&
8616 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) {
8617 if (Diagnose)
8618 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field)
8619 << !!ICI << MD->getParent() << FD << FD->getType() << /*Const*/1;
8620 return true;
8621 }
8622
8623 if (inUnion() && !FieldType.isConstQualified())
8624 AllFieldsAreConst = false;
8625 } else if (CSM == Sema::CXXCopyConstructor) {
8626 // For a copy constructor, data members must not be of rvalue reference
8627 // type.
8628 if (FieldType->isRValueReferenceType()) {
8629 if (Diagnose)
8630 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference)
8631 << MD->getParent() << FD << FieldType;
8632 return true;
8633 }
8634 } else if (IsAssignment) {
8635 // For an assignment operator, data members must not be of reference type.
8636 if (FieldType->isReferenceType()) {
8637 if (Diagnose)
8638 S.Diag(FD->getLocation(), diag::note_deleted_assign_field)
8639 << isMove() << MD->getParent() << FD << FieldType << /*Reference*/0;
8640 return true;
8641 }
8642 if (!FieldRecord && FieldType.isConstQualified()) {
8643 // C++11 [class.copy]p23:
8644 // -- a non-static data member of const non-class type (or array thereof)
8645 if (Diagnose)
8646 S.Diag(FD->getLocation(), diag::note_deleted_assign_field)
8647 << isMove() << MD->getParent() << FD << FD->getType() << /*Const*/1;
8648 return true;
8649 }
8650 }
8651
8652 if (FieldRecord) {
8653 // Some additional restrictions exist on the variant members.
8654 if (!inUnion() && FieldRecord->isUnion() &&
8655 FieldRecord->isAnonymousStructOrUnion()) {
8656 bool AllVariantFieldsAreConst = true;
8657
8658 // FIXME: Handle anonymous unions declared within anonymous unions.
8659 for (auto *UI : FieldRecord->fields()) {
8660 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType());
8661
8662 if (shouldDeleteForVariantObjCPtrMember(&*UI, UnionFieldType))
8663 return true;
8664
8665 if (!UnionFieldType.isConstQualified())
8666 AllVariantFieldsAreConst = false;
8667
8668 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl();
8669 if (UnionFieldRecord &&
8670 shouldDeleteForClassSubobject(UnionFieldRecord, UI,
8671 UnionFieldType.getCVRQualifiers()))
8672 return true;
8673 }
8674
8675 // At least one member in each anonymous union must be non-const
8676 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst &&
8677 !FieldRecord->field_empty()) {
8678 if (Diagnose)
8679 S.Diag(FieldRecord->getLocation(),
8680 diag::note_deleted_default_ctor_all_const)
8681 << !!ICI << MD->getParent() << /*anonymous union*/1;
8682 return true;
8683 }
8684
8685 // Don't check the implicit member of the anonymous union type.
8686 // This is technically non-conformant, but sanity demands it.
8687 return false;
8688 }
8689
8690 if (shouldDeleteForClassSubobject(FieldRecord, FD,
8691 FieldType.getCVRQualifiers()))
8692 return true;
8693 }
8694
8695 return false;
8696}
8697
8698/// C++11 [class.ctor] p5:
8699/// A defaulted default constructor for a class X is defined as deleted if
8700/// X is a union and all of its variant members are of const-qualified type.
8701bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() {
8702 // This is a silly definition, because it gives an empty union a deleted
8703 // default constructor. Don't do that.
8704 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst) {
8705 bool AnyFields = false;
8706 for (auto *F : MD->getParent()->fields())
8707 if ((AnyFields = !F->isUnnamedBitfield()))
8708 break;
8709 if (!AnyFields)
8710 return false;
8711 if (Diagnose)
8712 S.Diag(MD->getParent()->getLocation(),
8713 diag::note_deleted_default_ctor_all_const)
8714 << !!ICI << MD->getParent() << /*not anonymous union*/0;
8715 return true;
8716 }
8717 return false;
8718}
8719
8720/// Determine whether a defaulted special member function should be defined as
8721/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11,
8722/// C++11 [class.copy]p23, and C++11 [class.dtor]p5.
8723bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM,
8724 InheritedConstructorInfo *ICI,
8725 bool Diagnose) {
8726 if (MD->isInvalidDecl())
8727 return false;
8728 CXXRecordDecl *RD = MD->getParent();
8729 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\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 8729, __PRETTY_FUNCTION__))
;
8730 if (!LangOpts.CPlusPlus11 || RD->isInvalidDecl())
8731 return false;
8732
8733 // C++11 [expr.lambda.prim]p19:
8734 // The closure type associated with a lambda-expression has a
8735 // deleted (8.4.3) default constructor and a deleted copy
8736 // assignment operator.
8737 // C++2a adds back these operators if the lambda has no lambda-capture.
8738 if (RD->isLambda() && !RD->lambdaIsDefaultConstructibleAndAssignable() &&
8739 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) {
8740 if (Diagnose)
8741 Diag(RD->getLocation(), diag::note_lambda_decl);
8742 return true;
8743 }
8744
8745 // For an anonymous struct or union, the copy and assignment special members
8746 // will never be used, so skip the check. For an anonymous union declared at
8747 // namespace scope, the constructor and destructor are used.
8748 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor &&
8749 RD->isAnonymousStructOrUnion())
8750 return false;
8751
8752 // C++11 [class.copy]p7, p18:
8753 // If the class definition declares a move constructor or move assignment
8754 // operator, an implicitly declared copy constructor or copy assignment
8755 // operator is defined as deleted.
8756 if (MD->isImplicit() &&
8757 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) {
8758 CXXMethodDecl *UserDeclaredMove = nullptr;
8759
8760 // In Microsoft mode up to MSVC 2013, a user-declared move only causes the
8761 // deletion of the corresponding copy operation, not both copy operations.
8762 // MSVC 2015 has adopted the standards conforming behavior.
8763 bool DeletesOnlyMatchingCopy =
8764 getLangOpts().MSVCCompat &&
8765 !getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015);
8766
8767 if (RD->hasUserDeclaredMoveConstructor() &&
8768 (!DeletesOnlyMatchingCopy || CSM == CXXCopyConstructor)) {
8769 if (!Diagnose) return true;
8770
8771 // Find any user-declared move constructor.
8772 for (auto *I : RD->ctors()) {
8773 if (I->isMoveConstructor()) {
8774 UserDeclaredMove = I;
8775 break;
8776 }
8777 }
8778 assert(UserDeclaredMove)((UserDeclaredMove) ? static_cast<void> (0) : __assert_fail
("UserDeclaredMove", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 8778, __PRETTY_FUNCTION__))
;
8779 } else if (RD->hasUserDeclaredMoveAssignment() &&
8780 (!DeletesOnlyMatchingCopy || CSM == CXXCopyAssignment)) {
8781 if (!Diagnose) return true;
8782
8783 // Find any user-declared move assignment operator.
8784 for (auto *I : RD->methods()) {
8785 if (I->isMoveAssignmentOperator()) {
8786 UserDeclaredMove = I;
8787 break;
8788 }
8789 }
8790 assert(UserDeclaredMove)((UserDeclaredMove) ? static_cast<void> (0) : __assert_fail
("UserDeclaredMove", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 8790, __PRETTY_FUNCTION__))
;
8791 }
8792
8793 if (UserDeclaredMove) {
8794 Diag(UserDeclaredMove->getLocation(),
8795 diag::note_deleted_copy_user_declared_move)
8796 << (CSM == CXXCopyAssignment) << RD
8797 << UserDeclaredMove->isMoveAssignmentOperator();
8798 return true;
8799 }
8800 }
8801
8802 // Do access control from the special member function
8803 ContextRAII MethodContext(*this, MD);
8804
8805 // C++11 [class.dtor]p5:
8806 // -- for a virtual destructor, lookup of the non-array deallocation function
8807 // results in an ambiguity or in a function that is deleted or inaccessible
8808 if (CSM == CXXDestructor && MD->isVirtual()) {
8809 FunctionDecl *OperatorDelete = nullptr;
8810 DeclarationName Name =
8811 Context.DeclarationNames.getCXXOperatorName(OO_Delete);
8812 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name,
8813 OperatorDelete, /*Diagnose*/false)) {
8814 if (Diagnose)
8815 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete);
8816 return true;
8817 }
8818 }
8819
8820 SpecialMemberDeletionInfo SMI(*this, MD, CSM, ICI, Diagnose);
8821
8822 // Per DR1611, do not consider virtual bases of constructors of abstract
8823 // classes, since we are not going to construct them.
8824 // Per DR1658, do not consider virtual bases of destructors of abstract
8825 // classes either.
8826 // Per DR2180, for assignment operators we only assign (and thus only
8827 // consider) direct bases.
8828 if (SMI.visit(SMI.IsAssignment ? SMI.VisitDirectBases
8829 : SMI.VisitPotentiallyConstructedBases))
8830 return true;
8831
8832 if (SMI.shouldDeleteForAllConstMembers())
8833 return true;
8834
8835 if (getLangOpts().CUDA) {
8836 // We should delete the special member in CUDA mode if target inference
8837 // failed.
8838 // For inherited constructors (non-null ICI), CSM may be passed so that MD
8839 // is treated as certain special member, which may not reflect what special
8840 // member MD really is. However inferCUDATargetForImplicitSpecialMember
8841 // expects CSM to match MD, therefore recalculate CSM.
8842 assert(ICI || CSM == getSpecialMember(MD))((ICI || CSM == getSpecialMember(MD)) ? static_cast<void>
(0) : __assert_fail ("ICI || CSM == getSpecialMember(MD)", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 8842, __PRETTY_FUNCTION__))
;
8843 auto RealCSM = CSM;
8844 if (ICI)
8845 RealCSM = getSpecialMember(MD);
8846
8847 return inferCUDATargetForImplicitSpecialMember(RD, RealCSM, MD,
8848 SMI.ConstArg, Diagnose);
8849 }
8850
8851 return false;
8852}
8853
8854void Sema::DiagnoseDeletedDefaultedFunction(FunctionDecl *FD) {
8855 DefaultedFunctionKind DFK = getDefaultedFunctionKind(FD);
8856 assert(DFK && "not a defaultable function")((DFK && "not a defaultable function") ? static_cast<
void> (0) : __assert_fail ("DFK && \"not a defaultable function\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 8856, __PRETTY_FUNCTION__))
;
8857 assert(FD->isDefaulted() && FD->isDeleted() && "not defaulted and deleted")((FD->isDefaulted() && FD->isDeleted() &&
"not defaulted and deleted") ? static_cast<void> (0) :
__assert_fail ("FD->isDefaulted() && FD->isDeleted() && \"not defaulted and deleted\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 8857, __PRETTY_FUNCTION__))
;
8858
8859 if (DFK.isSpecialMember()) {
8860 ShouldDeleteSpecialMember(cast<CXXMethodDecl>(FD), DFK.asSpecialMember(),
8861 nullptr, /*Diagnose=*/true);
8862 } else {
8863 DefaultedComparisonAnalyzer(
8864 *this, cast<CXXRecordDecl>(FD->getLexicalDeclContext()), FD,
8865 DFK.asComparison(), DefaultedComparisonAnalyzer::ExplainDeleted)
8866 .visit();
8867 }
8868}
8869
8870/// Perform lookup for a special member of the specified kind, and determine
8871/// whether it is trivial. If the triviality can be determined without the
8872/// lookup, skip it. This is intended for use when determining whether a
8873/// special member of a containing object is trivial, and thus does not ever
8874/// perform overload resolution for default constructors.
8875///
8876/// If \p Selected is not \c NULL, \c *Selected will be filled in with the
8877/// member that was most likely to be intended to be trivial, if any.
8878///
8879/// If \p ForCall is true, look at CXXRecord::HasTrivialSpecialMembersForCall to
8880/// determine whether the special member is trivial.
8881static bool findTrivialSpecialMember(Sema &S, CXXRecordDecl *RD,
8882 Sema::CXXSpecialMember CSM, unsigned Quals,
8883 bool ConstRHS,
8884 Sema::TrivialABIHandling TAH,
8885 CXXMethodDecl **Selected) {
8886 if (Selected)
8887 *Selected = nullptr;
8888
8889 switch (CSM) {
8890 case Sema::CXXInvalid:
8891 llvm_unreachable("not a special member")::llvm::llvm_unreachable_internal("not a special member", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 8891)
;
8892
8893 case Sema::CXXDefaultConstructor:
8894 // C++11 [class.ctor]p5:
8895 // A default constructor is trivial if:
8896 // - all the [direct subobjects] have trivial default constructors
8897 //
8898 // Note, no overload resolution is performed in this case.
8899 if (RD->hasTrivialDefaultConstructor())
8900 return true;
8901
8902 if (Selected) {
8903 // If there's a default constructor which could have been trivial, dig it
8904 // out. Otherwise, if there's any user-provided default constructor, point
8905 // to that as an example of why there's not a trivial one.
8906 CXXConstructorDecl *DefCtor = nullptr;
8907 if (RD->needsImplicitDefaultConstructor())
8908 S.DeclareImplicitDefaultConstructor(RD);
8909 for (auto *CI : RD->ctors()) {
8910 if (!CI->isDefaultConstructor())
8911 continue;
8912 DefCtor = CI;
8913 if (!DefCtor->isUserProvided())
8914 break;
8915 }
8916
8917 *Selected = DefCtor;
8918 }
8919
8920 return false;
8921
8922 case Sema::CXXDestructor:
8923 // C++11 [class.dtor]p5:
8924 // A destructor is trivial if:
8925 // - all the direct [subobjects] have trivial destructors
8926 if (RD->hasTrivialDestructor() ||
8927 (TAH == Sema::TAH_ConsiderTrivialABI &&
8928 RD->hasTrivialDestructorForCall()))
8929 return true;
8930
8931 if (Selected) {
8932 if (RD->needsImplicitDestructor())
8933 S.DeclareImplicitDestructor(RD);
8934 *Selected = RD->getDestructor();
8935 }
8936
8937 return false;
8938
8939 case Sema::CXXCopyConstructor:
8940 // C++11 [class.copy]p12:
8941 // A copy constructor is trivial if:
8942 // - the constructor selected to copy each direct [subobject] is trivial
8943 if (RD->hasTrivialCopyConstructor() ||
8944 (TAH == Sema::TAH_ConsiderTrivialABI &&
8945 RD->hasTrivialCopyConstructorForCall())) {
8946 if (Quals == Qualifiers::Const)
8947 // We must either select the trivial copy constructor or reach an
8948 // ambiguity; no need to actually perform overload resolution.
8949 return true;
8950 } else if (!Selected) {
8951 return false;
8952 }
8953 // In C++98, we are not supposed to perform overload resolution here, but we
8954 // treat that as a language defect, as suggested on cxx-abi-dev, to treat
8955 // cases like B as having a non-trivial copy constructor:
8956 // struct A { template<typename T> A(T&); };
8957 // struct B { mutable A a; };
8958 goto NeedOverloadResolution;
8959
8960 case Sema::CXXCopyAssignment:
8961 // C++11 [class.copy]p25:
8962 // A copy assignment operator is trivial if:
8963 // - the assignment operator selected to copy each direct [subobject] is
8964 // trivial
8965 if (RD->hasTrivialCopyAssignment()) {
8966 if (Quals == Qualifiers::Const)
8967 return true;
8968 } else if (!Selected) {
8969 return false;
8970 }
8971 // In C++98, we are not supposed to perform overload resolution here, but we
8972 // treat that as a language defect.
8973 goto NeedOverloadResolution;
8974
8975 case Sema::CXXMoveConstructor:
8976 case Sema::CXXMoveAssignment:
8977 NeedOverloadResolution:
8978 Sema::SpecialMemberOverloadResult SMOR =
8979 lookupCallFromSpecialMember(S, RD, CSM, Quals, ConstRHS);
8980
8981 // The standard doesn't describe how to behave if the lookup is ambiguous.
8982 // We treat it as not making the member non-trivial, just like the standard
8983 // mandates for the default constructor. This should rarely matter, because
8984 // the member will also be deleted.
8985 if (SMOR.getKind() == Sema::SpecialMemberOverloadResult::Ambiguous)
8986 return true;
8987
8988 if (!SMOR.getMethod()) {
8989 assert(SMOR.getKind() ==((SMOR.getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted
) ? static_cast<void> (0) : __assert_fail ("SMOR.getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 8990, __PRETTY_FUNCTION__))
8990 Sema::SpecialMemberOverloadResult::NoMemberOrDeleted)((SMOR.getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted
) ? static_cast<void> (0) : __assert_fail ("SMOR.getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 8990, __PRETTY_FUNCTION__))
;
8991 return false;
8992 }
8993
8994 // We deliberately don't check if we found a deleted special member. We're
8995 // not supposed to!
8996 if (Selected)
8997 *Selected = SMOR.getMethod();
8998
8999 if (TAH == Sema::TAH_ConsiderTrivialABI &&
9000 (CSM == Sema::CXXCopyConstructor || CSM == Sema::CXXMoveConstructor))
9001 return SMOR.getMethod()->isTrivialForCall();
9002 return SMOR.getMethod()->isTrivial();
9003 }
9004
9005 llvm_unreachable("unknown special method kind")::llvm::llvm_unreachable_internal("unknown special method kind"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 9005)
;
9006}
9007
9008static CXXConstructorDecl *findUserDeclaredCtor(CXXRecordDecl *RD) {
9009 for (auto *CI : RD->ctors())
9010 if (!CI->isImplicit())
9011 return CI;
9012
9013 // Look for constructor templates.
9014 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> tmpl_iter;
9015 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); TI != TE; ++TI) {
9016 if (CXXConstructorDecl *CD =
9017 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl()))
9018 return CD;
9019 }
9020
9021 return nullptr;
9022}
9023
9024/// The kind of subobject we are checking for triviality. The values of this
9025/// enumeration are used in diagnostics.
9026enum TrivialSubobjectKind {
9027 /// The subobject is a base class.
9028 TSK_BaseClass,
9029 /// The subobject is a non-static data member.
9030 TSK_Field,
9031 /// The object is actually the complete object.
9032 TSK_CompleteObject
9033};
9034
9035/// Check whether the special member selected for a given type would be trivial.
9036static bool checkTrivialSubobjectCall(Sema &S, SourceLocation SubobjLoc,
9037 QualType SubType, bool ConstRHS,
9038 Sema::CXXSpecialMember CSM,
9039 TrivialSubobjectKind Kind,
9040 Sema::TrivialABIHandling TAH, bool Diagnose) {
9041 CXXRecordDecl *SubRD = SubType->getAsCXXRecordDecl();
9042 if (!SubRD)
9043 return true;
9044
9045 CXXMethodDecl *Selected;
9046 if (findTrivialSpecialMember(S, SubRD, CSM, SubType.getCVRQualifiers(),
9047 ConstRHS, TAH, Diagnose ? &Selected : nullptr))
9048 return true;
9049
9050 if (Diagnose) {
9051 if (ConstRHS)
9052 SubType.addConst();
9053
9054 if (!Selected && CSM == Sema::CXXDefaultConstructor) {
9055 S.Diag(SubobjLoc, diag::note_nontrivial_no_def_ctor)
9056 << Kind << SubType.getUnqualifiedType();
9057 if (CXXConstructorDecl *CD = findUserDeclaredCtor(SubRD))
9058 S.Diag(CD->getLocation(), diag::note_user_declared_ctor);
9059 } else if (!Selected)
9060 S.Diag(SubobjLoc, diag::note_nontrivial_no_copy)
9061 << Kind << SubType.getUnqualifiedType() << CSM << SubType;
9062 else if (Selected->isUserProvided()) {
9063 if (Kind == TSK_CompleteObject)
9064 S.Diag(Selected->getLocation(), diag::note_nontrivial_user_provided)
9065 << Kind << SubType.getUnqualifiedType() << CSM;
9066 else {
9067 S.Diag(SubobjLoc, diag::note_nontrivial_user_provided)
9068 << Kind << SubType.getUnqualifiedType() << CSM;
9069 S.Diag(Selected->getLocation(), diag::note_declared_at);
9070 }
9071 } else {
9072 if (Kind != TSK_CompleteObject)
9073 S.Diag(SubobjLoc, diag::note_nontrivial_subobject)
9074 << Kind << SubType.getUnqualifiedType() << CSM;
9075
9076 // Explain why the defaulted or deleted special member isn't trivial.
9077 S.SpecialMemberIsTrivial(Selected, CSM, Sema::TAH_IgnoreTrivialABI,
9078 Diagnose);
9079 }
9080 }
9081
9082 return false;
9083}
9084
9085/// Check whether the members of a class type allow a special member to be
9086/// trivial.
9087static bool checkTrivialClassMembers(Sema &S, CXXRecordDecl *RD,
9088 Sema::CXXSpecialMember CSM,
9089 bool ConstArg,
9090 Sema::TrivialABIHandling TAH,
9091 bool Diagnose) {
9092 for (const auto *FI : RD->fields()) {
9093 if (FI->isInvalidDecl() || FI->isUnnamedBitfield())
9094 continue;
9095
9096 QualType FieldType = S.Context.getBaseElementType(FI->getType());
9097
9098 // Pretend anonymous struct or union members are members of this class.
9099 if (FI->isAnonymousStructOrUnion()) {
9100 if (!checkTrivialClassMembers(S, FieldType->getAsCXXRecordDecl(),
9101 CSM, ConstArg, TAH, Diagnose))
9102 return false;
9103 continue;
9104 }
9105
9106 // C++11 [class.ctor]p5:
9107 // A default constructor is trivial if [...]
9108 // -- no non-static data member of its class has a
9109 // brace-or-equal-initializer
9110 if (CSM == Sema::CXXDefaultConstructor && FI->hasInClassInitializer()) {
9111 if (Diagnose)
9112 S.Diag(FI->getLocation(), diag::note_nontrivial_in_class_init) << FI;
9113 return false;
9114 }
9115
9116 // Objective C ARC 4.3.5:
9117 // [...] nontrivally ownership-qualified types are [...] not trivially
9118 // default constructible, copy constructible, move constructible, copy
9119 // assignable, move assignable, or destructible [...]
9120 if (FieldType.hasNonTrivialObjCLifetime()) {
9121 if (Diagnose)
9122 S.Diag(FI->getLocation(), diag::note_nontrivial_objc_ownership)
9123 << RD << FieldType.getObjCLifetime();
9124 return false;
9125 }
9126
9127 bool ConstRHS = ConstArg && !FI->isMutable();
9128 if (!checkTrivialSubobjectCall(S, FI->getLocation(), FieldType, ConstRHS,
9129 CSM, TSK_Field, TAH, Diagnose))
9130 return false;
9131 }
9132
9133 return true;
9134}
9135
9136/// Diagnose why the specified class does not have a trivial special member of
9137/// the given kind.
9138void Sema::DiagnoseNontrivial(const CXXRecordDecl *RD, CXXSpecialMember CSM) {
9139 QualType Ty = Context.getRecordType(RD);
9140
9141 bool ConstArg = (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment);
9142 checkTrivialSubobjectCall(*this, RD->getLocation(), Ty, ConstArg, CSM,
9143 TSK_CompleteObject, TAH_IgnoreTrivialABI,
9144 /*Diagnose*/true);
9145}
9146
9147/// Determine whether a defaulted or deleted special member function is trivial,
9148/// as specified in C++11 [class.ctor]p5, C++11 [class.copy]p12,
9149/// C++11 [class.copy]p25, and C++11 [class.dtor]p5.
9150bool Sema::SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM,
9151 TrivialABIHandling TAH, bool Diagnose) {
9152 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\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 9152, __PRETTY_FUNCTION__))
;
9153
9154 CXXRecordDecl *RD = MD->getParent();
9155
9156 bool ConstArg = false;
9157
9158 // C++11 [class.copy]p12, p25: [DR1593]
9159 // A [special member] is trivial if [...] its parameter-type-list is
9160 // equivalent to the parameter-type-list of an implicit declaration [...]
9161 switch (CSM) {
9162 case CXXDefaultConstructor:
9163 case CXXDestructor:
9164 // Trivial default constructors and destructors cannot have parameters.
9165 break;
9166
9167 case CXXCopyConstructor:
9168 case CXXCopyAssignment: {
9169 // Trivial copy operations always have const, non-volatile parameter types.
9170 ConstArg = true;
9171 const ParmVarDecl *Param0 = MD->getParamDecl(0);
9172 const ReferenceType *RT = Param0->getType()->getAs<ReferenceType>();
9173 if (!RT || RT->getPointeeType().getCVRQualifiers() != Qualifiers::Const) {
9174 if (Diagnose)
9175 Diag(Param0->getLocation(), diag::note_nontrivial_param_type)
9176 << Param0->getSourceRange() << Param0->getType()
9177 << Context.getLValueReferenceType(
9178 Context.getRecordType(RD).withConst());
9179 return false;
9180 }
9181 break;
9182 }
9183
9184 case CXXMoveConstructor:
9185 case CXXMoveAssignment: {
9186 // Trivial move operations always have non-cv-qualified parameters.
9187 const ParmVarDecl *Param0 = MD->getParamDecl(0);
9188 const RValueReferenceType *RT =
9189 Param0->getType()->getAs<RValueReferenceType>();
9190 if (!RT || RT->getPointeeType().getCVRQualifiers()) {
9191 if (Diagnose)
9192 Diag(Param0->getLocation(), diag::note_nontrivial_param_type)
9193 << Param0->getSourceRange() << Param0->getType()
9194 << Context.getRValueReferenceType(Context.getRecordType(RD));
9195 return false;
9196 }
9197 break;
9198 }
9199
9200 case CXXInvalid:
9201 llvm_unreachable("not a special member")::llvm::llvm_unreachable_internal("not a special member", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 9201)
;
9202 }
9203
9204 if (MD->getMinRequiredArguments() < MD->getNumParams()) {
9205 if (Diagnose)
9206 Diag(MD->getParamDecl(MD->getMinRequiredArguments())->getLocation(),
9207 diag::note_nontrivial_default_arg)
9208 << MD->getParamDecl(MD->getMinRequiredArguments())->getSourceRange();
9209 return false;
9210 }
9211 if (MD->isVariadic()) {
9212 if (Diagnose)
9213 Diag(MD->getLocation(), diag::note_nontrivial_variadic);
9214 return false;
9215 }
9216
9217 // C++11 [class.ctor]p5, C++11 [class.dtor]p5:
9218 // A copy/move [constructor or assignment operator] is trivial if
9219 // -- the [member] selected to copy/move each direct base class subobject
9220 // is trivial
9221 //
9222 // C++11 [class.copy]p12, C++11 [class.copy]p25:
9223 // A [default constructor or destructor] is trivial if
9224 // -- all the direct base classes have trivial [default constructors or
9225 // destructors]
9226 for (const auto &BI : RD->bases())
9227 if (!checkTrivialSubobjectCall(*this, BI.getBeginLoc(), BI.getType(),
9228 ConstArg, CSM, TSK_BaseClass, TAH, Diagnose))
9229 return false;
9230
9231 // C++11 [class.ctor]p5, C++11 [class.dtor]p5:
9232 // A copy/move [constructor or assignment operator] for a class X is
9233 // trivial if
9234 // -- for each non-static data member of X that is of class type (or array
9235 // thereof), the constructor selected to copy/move that member is
9236 // trivial
9237 //
9238 // C++11 [class.copy]p12, C++11 [class.copy]p25:
9239 // A [default constructor or destructor] is trivial if
9240 // -- for all of the non-static data members of its class that are of class
9241 // type (or array thereof), each such class has a trivial [default
9242 // constructor or destructor]
9243 if (!checkTrivialClassMembers(*this, RD, CSM, ConstArg, TAH, Diagnose))
9244 return false;
9245
9246 // C++11 [class.dtor]p5:
9247 // A destructor is trivial if [...]
9248 // -- the destructor is not virtual
9249 if (CSM == CXXDestructor && MD->isVirtual()) {
9250 if (Diagnose)
9251 Diag(MD->getLocation(), diag::note_nontrivial_virtual_dtor) << RD;
9252 return false;
9253 }
9254
9255 // C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25:
9256 // A [special member] for class X is trivial if [...]
9257 // -- class X has no virtual functions and no virtual base classes
9258 if (CSM != CXXDestructor && MD->getParent()->isDynamicClass()) {
9259 if (!Diagnose)
9260 return false;
9261
9262 if (RD->getNumVBases()) {
9263 // Check for virtual bases. We already know that the corresponding
9264 // member in all bases is trivial, so vbases must all be direct.
9265 CXXBaseSpecifier &BS = *RD->vbases_begin();
9266 assert(BS.isVirtual())((BS.isVirtual()) ? static_cast<void> (0) : __assert_fail
("BS.isVirtual()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 9266, __PRETTY_FUNCTION__))
;
9267 Diag(BS.getBeginLoc(), diag::note_nontrivial_has_virtual) << RD << 1;
9268 return false;
9269 }
9270
9271 // Must have a virtual method.
9272 for (const auto *MI : RD->methods()) {
9273 if (MI->isVirtual()) {
9274 SourceLocation MLoc = MI->getBeginLoc();
9275 Diag(MLoc, diag::note_nontrivial_has_virtual) << RD << 0;
9276 return false;
9277 }
9278 }
9279
9280 llvm_unreachable("dynamic class with no vbases and no virtual functions")::llvm::llvm_unreachable_internal("dynamic class with no vbases and no virtual functions"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 9280)
;
9281 }
9282
9283 // Looks like it's trivial!
9284 return true;
9285}
9286
9287namespace {
9288struct FindHiddenVirtualMethod {
9289 Sema *S;
9290 CXXMethodDecl *Method;
9291 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods;
9292 SmallVector<CXXMethodDecl *, 8> OverloadedMethods;
9293
9294private:
9295 /// Check whether any most overridden method from MD in Methods
9296 static bool CheckMostOverridenMethods(
9297 const CXXMethodDecl *MD,
9298 const llvm::SmallPtrSetImpl<const CXXMethodDecl *> &Methods) {
9299 if (MD->size_overridden_methods() == 0)
9300 return Methods.count(MD->getCanonicalDecl());
9301 for (const CXXMethodDecl *O : MD->overridden_methods())
9302 if (CheckMostOverridenMethods(O, Methods))
9303 return true;
9304 return false;
9305 }
9306
9307public:
9308 /// Member lookup function that determines whether a given C++
9309 /// method overloads virtual methods in a base class without overriding any,
9310 /// to be used with CXXRecordDecl::lookupInBases().
9311 bool operator()(const CXXBaseSpecifier *Specifier, CXXBasePath &Path) {
9312 RecordDecl *BaseRecord =
9313 Specifier->getType()->castAs<RecordType>()->getDecl();
9314
9315 DeclarationName Name = Method->getDeclName();
9316 assert(Name.getNameKind() == DeclarationName::Identifier)((Name.getNameKind() == DeclarationName::Identifier) ? static_cast
<void> (0) : __assert_fail ("Name.getNameKind() == DeclarationName::Identifier"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 9316, __PRETTY_FUNCTION__))
;
9317
9318 bool foundSameNameMethod = false;
9319 SmallVector<CXXMethodDecl *, 8> overloadedMethods;
9320 for (Path.Decls = BaseRecord->lookup(Name); !Path.Decls.empty();
9321 Path.Decls = Path.Decls.slice(1)) {
9322 NamedDecl *D = Path.Decls.front();
9323 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) {
9324 MD = MD->getCanonicalDecl();
9325 foundSameNameMethod = true;
9326 // Interested only in hidden virtual methods.
9327 if (!MD->isVirtual())
9328 continue;
9329 // If the method we are checking overrides a method from its base
9330 // don't warn about the other overloaded methods. Clang deviates from
9331 // GCC by only diagnosing overloads of inherited virtual functions that
9332 // do not override any other virtual functions in the base. GCC's
9333 // -Woverloaded-virtual diagnoses any derived function hiding a virtual
9334 // function from a base class. These cases may be better served by a
9335 // warning (not specific to virtual functions) on call sites when the
9336 // call would select a different function from the base class, were it
9337 // visible.
9338 // See FIXME in test/SemaCXX/warn-overload-virtual.cpp for an example.
9339 if (!S->IsOverload(Method, MD, false))
9340 return true;
9341 // Collect the overload only if its hidden.
9342 if (!CheckMostOverridenMethods(MD, OverridenAndUsingBaseMethods))
9343 overloadedMethods.push_back(MD);
9344 }
9345 }
9346
9347 if (foundSameNameMethod)
9348 OverloadedMethods.append(overloadedMethods.begin(),
9349 overloadedMethods.end());
9350 return foundSameNameMethod;
9351 }
9352};
9353} // end anonymous namespace
9354
9355/// Add the most overriden methods from MD to Methods
9356static void AddMostOverridenMethods(const CXXMethodDecl *MD,
9357 llvm::SmallPtrSetImpl<const CXXMethodDecl *>& Methods) {
9358 if (MD->size_overridden_methods() == 0)
9359 Methods.insert(MD->getCanonicalDecl());
9360 else
9361 for (const CXXMethodDecl *O : MD->overridden_methods())
9362 AddMostOverridenMethods(O, Methods);
9363}
9364
9365/// Check if a method overloads virtual methods in a base class without
9366/// overriding any.
9367void Sema::FindHiddenVirtualMethods(CXXMethodDecl *MD,
9368 SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods) {
9369 if (!MD->getDeclName().isIdentifier())
9370 return;
9371
9372 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases.
9373 /*bool RecordPaths=*/false,
9374 /*bool DetectVirtual=*/false);
9375 FindHiddenVirtualMethod FHVM;
9376 FHVM.Method = MD;
9377 FHVM.S = this;
9378
9379 // Keep the base methods that were overridden or introduced in the subclass
9380 // by 'using' in a set. A base method not in this set is hidden.
9381 CXXRecordDecl *DC = MD->getParent();
9382 DeclContext::lookup_result R = DC->lookup(MD->getDeclName());
9383 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; ++I) {
9384 NamedDecl *ND = *I;
9385 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*I))
9386 ND = shad->getTargetDecl();
9387 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND))
9388 AddMostOverridenMethods(MD, FHVM.OverridenAndUsingBaseMethods);
9389 }
9390
9391 if (DC->lookupInBases(FHVM, Paths))
9392 OverloadedMethods = FHVM.OverloadedMethods;
9393}
9394
9395void Sema::NoteHiddenVirtualMethods(CXXMethodDecl *MD,
9396 SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods) {
9397 for (unsigned i = 0, e = OverloadedMethods.size(); i != e; ++i) {
9398 CXXMethodDecl *overloadedMD = OverloadedMethods[i];
9399 PartialDiagnostic PD = PDiag(
9400 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD;
9401 HandleFunctionTypeMismatch(PD, MD->getType(), overloadedMD->getType());
9402 Diag(overloadedMD->getLocation(), PD);
9403 }
9404}
9405
9406/// Diagnose methods which overload virtual methods in a base class
9407/// without overriding any.
9408void Sema::DiagnoseHiddenVirtualMethods(CXXMethodDecl *MD) {
9409 if (MD->isInvalidDecl())
9410 return;
9411
9412 if (Diags.isIgnored(diag::warn_overloaded_virtual, MD->getLocation()))
9413 return;
9414
9415 SmallVector<CXXMethodDecl *, 8> OverloadedMethods;
9416 FindHiddenVirtualMethods(MD, OverloadedMethods);
9417 if (!OverloadedMethods.empty()) {
9418 Diag(MD->getLocation(), diag::warn_overloaded_virtual)
9419 << MD << (OverloadedMethods.size() > 1);
9420
9421 NoteHiddenVirtualMethods(MD, OverloadedMethods);
9422 }
9423}
9424
9425void Sema::checkIllFormedTrivialABIStruct(CXXRecordDecl &RD) {
9426 auto PrintDiagAndRemoveAttr = [&]() {
9427 // No diagnostics if this is a template instantiation.
9428 if (!isTemplateInstantiation(RD.getTemplateSpecializationKind()))
9429 Diag(RD.getAttr<TrivialABIAttr>()->getLocation(),
9430 diag::ext_cannot_use_trivial_abi) << &RD;
9431 RD.dropAttr<TrivialABIAttr>();
9432 };
9433
9434 // Ill-formed if the struct has virtual functions.
9435 if (RD.isPolymorphic()) {
9436 PrintDiagAndRemoveAttr();
9437 return;
9438 }
9439
9440 for (const auto &B : RD.bases()) {
9441 // Ill-formed if the base class is non-trivial for the purpose of calls or a
9442 // virtual base.
9443 if ((!B.getType()->isDependentType() &&
9444 !B.getType()->getAsCXXRecordDecl()->canPassInRegisters()) ||
9445 B.isVirtual()) {
9446 PrintDiagAndRemoveAttr();
9447 return;
9448 }
9449 }
9450
9451 for (const auto *FD : RD.fields()) {
9452 // Ill-formed if the field is an ObjectiveC pointer or of a type that is
9453 // non-trivial for the purpose of calls.
9454 QualType FT = FD->getType();
9455 if (FT.getObjCLifetime() == Qualifiers::OCL_Weak) {
9456 PrintDiagAndRemoveAttr();
9457 return;
9458 }
9459
9460 if (const auto *RT = FT->getBaseElementTypeUnsafe()->getAs<RecordType>())
9461 if (!RT->isDependentType() &&
9462 !cast<CXXRecordDecl>(RT->getDecl())->canPassInRegisters()) {
9463 PrintDiagAndRemoveAttr();
9464 return;
9465 }
9466 }
9467}
9468
9469void Sema::ActOnFinishCXXMemberSpecification(
9470 Scope *S, SourceLocation RLoc, Decl *TagDecl, SourceLocation LBrac,
9471 SourceLocation RBrac, const ParsedAttributesView &AttrList) {
9472 if (!TagDecl)
9473 return;
9474
9475 AdjustDeclIfTemplate(TagDecl);
9476
9477 for (const ParsedAttr &AL : AttrList) {
9478 if (AL.getKind() != ParsedAttr::AT_Visibility)
9479 continue;
9480 AL.setInvalid();
9481 Diag(AL.getLoc(), diag::warn_attribute_after_definition_ignored) << AL;
9482 }
9483
9484 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef(
9485 // strict aliasing violation!
9486 reinterpret_cast<Decl**>(FieldCollector->getCurFields()),
9487 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList);
9488
9489 CheckCompletedCXXClass(S, cast<CXXRecordDecl>(TagDecl));
9490}
9491
9492/// Find the equality comparison functions that should be implicitly declared
9493/// in a given class definition, per C++2a [class.compare.default]p3.
9494static void findImplicitlyDeclaredEqualityComparisons(
9495 ASTContext &Ctx, CXXRecordDecl *RD,
9496 llvm::SmallVectorImpl<FunctionDecl *> &Spaceships) {
9497 DeclarationName EqEq = Ctx.DeclarationNames.getCXXOperatorName(OO_EqualEqual);
9498 if (!RD->lookup(EqEq).empty())
9499 // Member operator== explicitly declared: no implicit operator==s.
9500 return;
9501
9502 // Traverse friends looking for an '==' or a '<=>'.
9503 for (FriendDecl *Friend : RD->friends()) {
9504 FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(Friend->getFriendDecl());
9505 if (!FD) continue;
9506
9507 if (FD->getOverloadedOperator() == OO_EqualEqual) {
9508 // Friend operator== explicitly declared: no implicit operator==s.
9509 Spaceships.clear();
9510 return;
9511 }
9512
9513 if (FD->getOverloadedOperator() == OO_Spaceship &&
9514 FD->isExplicitlyDefaulted())
9515 Spaceships.push_back(FD);
9516 }
9517
9518 // Look for members named 'operator<=>'.
9519 DeclarationName Cmp = Ctx.DeclarationNames.getCXXOperatorName(OO_Spaceship);
9520 for (NamedDecl *ND : RD->lookup(Cmp)) {
9521 // Note that we could find a non-function here (either a function template
9522 // or a using-declaration). Neither case results in an implicit
9523 // 'operator=='.
9524 if (auto *FD = dyn_cast<FunctionDecl>(ND))
9525 if (FD->isExplicitlyDefaulted())
9526 Spaceships.push_back(FD);
9527 }
9528}
9529
9530/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared
9531/// special functions, such as the default constructor, copy
9532/// constructor, or destructor, to the given C++ class (C++
9533/// [special]p1). This routine can only be executed just before the
9534/// definition of the class is complete.
9535void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) {
9536 if (ClassDecl->needsImplicitDefaultConstructor()) {
9537 ++getASTContext().NumImplicitDefaultConstructors;
9538
9539 if (ClassDecl->hasInheritedConstructor())
9540 DeclareImplicitDefaultConstructor(ClassDecl);
9541 }
9542
9543 if (ClassDecl->needsImplicitCopyConstructor()) {
9544 ++getASTContext().NumImplicitCopyConstructors;
9545
9546 // If the properties or semantics of the copy constructor couldn't be
9547 // determined while the class was being declared, force a declaration
9548 // of it now.
9549 if (ClassDecl->needsOverloadResolutionForCopyConstructor() ||
9550 ClassDecl->hasInheritedConstructor())
9551 DeclareImplicitCopyConstructor(ClassDecl);
9552 // For the MS ABI we need to know whether the copy ctor is deleted. A
9553 // prerequisite for deleting the implicit copy ctor is that the class has a
9554 // move ctor or move assignment that is either user-declared or whose
9555 // semantics are inherited from a subobject. FIXME: We should provide a more
9556 // direct way for CodeGen to ask whether the constructor was deleted.
9557 else if (Context.getTargetInfo().getCXXABI().isMicrosoft() &&
9558 (ClassDecl->hasUserDeclaredMoveConstructor() ||
9559 ClassDecl->needsOverloadResolutionForMoveConstructor() ||
9560 ClassDecl->hasUserDeclaredMoveAssignment() ||
9561 ClassDecl->needsOverloadResolutionForMoveAssignment()))
9562 DeclareImplicitCopyConstructor(ClassDecl);
9563 }
9564
9565 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveConstructor()) {
9566 ++getASTContext().NumImplicitMoveConstructors;
9567
9568 if (ClassDecl->needsOverloadResolutionForMoveConstructor() ||
9569 ClassDecl->hasInheritedConstructor())
9570 DeclareImplicitMoveConstructor(ClassDecl);
9571 }
9572
9573 if (ClassDecl->needsImplicitCopyAssignment()) {
9574 ++getASTContext().NumImplicitCopyAssignmentOperators;
9575
9576 // If we have a dynamic class, then the copy assignment operator may be
9577 // virtual, so we have to declare it immediately. This ensures that, e.g.,
9578 // it shows up in the right place in the vtable and that we diagnose
9579 // problems with the implicit exception specification.
9580 if (ClassDecl->isDynamicClass() ||
9581 ClassDecl->needsOverloadResolutionForCopyAssignment() ||
9582 ClassDecl->hasInheritedAssignment())
9583 DeclareImplicitCopyAssignment(ClassDecl);
9584 }
9585
9586 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveAssignment()) {
9587 ++getASTContext().NumImplicitMoveAssignmentOperators;
9588
9589 // Likewise for the move assignment operator.
9590 if (ClassDecl->isDynamicClass() ||
9591 ClassDecl->needsOverloadResolutionForMoveAssignment() ||
9592 ClassDecl->hasInheritedAssignment())
9593 DeclareImplicitMoveAssignment(ClassDecl);
9594 }
9595
9596 if (ClassDecl->needsImplicitDestructor()) {
9597 ++getASTContext().NumImplicitDestructors;
9598
9599 // If we have a dynamic class, then the destructor may be virtual, so we
9600 // have to declare the destructor immediately. This ensures that, e.g., it
9601 // shows up in the right place in the vtable and that we diagnose problems
9602 // with the implicit exception specification.
9603 if (ClassDecl->isDynamicClass() ||
9604 ClassDecl->needsOverloadResolutionForDestructor())
9605 DeclareImplicitDestructor(ClassDecl);
9606 }
9607
9608 // C++2a [class.compare.default]p3:
9609 // If the member-specification does not explicitly declare any member or
9610 // friend named operator==, an == operator function is declared implicitly
9611 // for each defaulted three-way comparison operator function defined in the
9612 // member-specification
9613 // FIXME: Consider doing this lazily.
9614 if (getLangOpts().CPlusPlus2a) {
9615 llvm::SmallVector<FunctionDecl*, 4> DefaultedSpaceships;
9616 findImplicitlyDeclaredEqualityComparisons(Context, ClassDecl,
9617 DefaultedSpaceships);
9618 for (auto *FD : DefaultedSpaceships)
9619 DeclareImplicitEqualityComparison(ClassDecl, FD);
9620 }
9621}
9622
9623unsigned Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) {
9624 if (!D)
9625 return 0;
9626
9627 // The order of template parameters is not important here. All names
9628 // get added to the same scope.
9629 SmallVector<TemplateParameterList *, 4> ParameterLists;
9630
9631 if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D))
9632 D = TD->getTemplatedDecl();
9633
9634 if (auto *PSD = dyn_cast<ClassTemplatePartialSpecializationDecl>(D))
9635 ParameterLists.push_back(PSD->getTemplateParameters());
9636
9637 if (DeclaratorDecl *DD = dyn_cast<DeclaratorDecl>(D)) {
9638 for (unsigned i = 0; i < DD->getNumTemplateParameterLists(); ++i)
9639 ParameterLists.push_back(DD->getTemplateParameterList(i));
9640
9641 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
9642 if (FunctionTemplateDecl *FTD = FD->getDescribedFunctionTemplate())
9643 ParameterLists.push_back(FTD->getTemplateParameters());
9644 }
9645 }
9646
9647 if (TagDecl *TD = dyn_cast<TagDecl>(D)) {
9648 for (unsigned i = 0; i < TD->getNumTemplateParameterLists(); ++i)
9649 ParameterLists.push_back(TD->getTemplateParameterList(i));
9650
9651 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(TD)) {
9652 if (ClassTemplateDecl *CTD = RD->getDescribedClassTemplate())
9653 ParameterLists.push_back(CTD->getTemplateParameters());
9654 }
9655 }
9656
9657 unsigned Count = 0;
9658 for (TemplateParameterList *Params : ParameterLists) {
9659 if (Params->size() > 0)
9660 // Ignore explicit specializations; they don't contribute to the template
9661 // depth.
9662 ++Count;
9663 for (NamedDecl *Param : *Params) {
9664 if (Param->getDeclName()) {
9665 S->AddDecl(Param);
9666 IdResolver.AddDecl(Param);
9667 }
9668 }
9669 }
9670
9671 return Count;
9672}
9673
9674void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) {
9675 if (!RecordD) return;
9676 AdjustDeclIfTemplate(RecordD);
9677 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD);
9678 PushDeclContext(S, Record);
9679}
9680
9681void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) {
9682 if (!RecordD) return;
9683 PopDeclContext();
9684}
9685
9686/// This is used to implement the constant expression evaluation part of the
9687/// attribute enable_if extension. There is nothing in standard C++ which would
9688/// require reentering parameters.
9689void Sema::ActOnReenterCXXMethodParameter(Scope *S, ParmVarDecl *Param) {
9690 if (!Param)
9691 return;
9692
9693 S->AddDecl(Param);
9694 if (Param->getDeclName())
9695 IdResolver.AddDecl(Param);
9696}
9697
9698/// ActOnStartDelayedCXXMethodDeclaration - We have completed
9699/// parsing a top-level (non-nested) C++ class, and we are now
9700/// parsing those parts of the given Method declaration that could
9701/// not be parsed earlier (C++ [class.mem]p2), such as default
9702/// arguments. This action should enter the scope of the given
9703/// Method declaration as if we had just parsed the qualified method
9704/// name. However, it should not bring the parameters into scope;
9705/// that will be performed by ActOnDelayedCXXMethodParameter.
9706void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) {
9707}
9708
9709/// ActOnDelayedCXXMethodParameter - We've already started a delayed
9710/// C++ method declaration. We're (re-)introducing the given
9711/// function parameter into scope for use in parsing later parts of
9712/// the method declaration. For example, we could see an
9713/// ActOnParamDefaultArgument event for this parameter.
9714void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) {
9715 if (!ParamD)
9716 return;
9717
9718 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD);
9719
9720 // If this parameter has an unparsed default argument, clear it out
9721 // to make way for the parsed default argument.
9722 if (Param->hasUnparsedDefaultArg())
9723 Param->setDefaultArg(nullptr);
9724
9725 S->AddDecl(Param);
9726 if (Param->getDeclName())
9727 IdResolver.AddDecl(Param);
9728}
9729
9730/// ActOnFinishDelayedCXXMethodDeclaration - We have finished
9731/// processing the delayed method declaration for Method. The method
9732/// declaration is now considered finished. There may be a separate
9733/// ActOnStartOfFunctionDef action later (not necessarily
9734/// immediately!) for this method, if it was also defined inside the
9735/// class body.
9736void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) {
9737 if (!MethodD)
9738 return;
9739
9740 AdjustDeclIfTemplate(MethodD);
9741
9742 FunctionDecl *Method = cast<FunctionDecl>(MethodD);
9743
9744 // Now that we have our default arguments, check the constructor
9745 // again. It could produce additional diagnostics or affect whether
9746 // the class has implicitly-declared destructors, among other
9747 // things.
9748 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method))
9749 CheckConstructor(Constructor);
9750
9751 // Check the default arguments, which we may have added.
9752 if (!Method->isInvalidDecl())
9753 CheckCXXDefaultArguments(Method);
9754}
9755
9756// Emit the given diagnostic for each non-address-space qualifier.
9757// Common part of CheckConstructorDeclarator and CheckDestructorDeclarator.
9758static void checkMethodTypeQualifiers(Sema &S, Declarator &D, unsigned DiagID) {
9759 const DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
9760 if (FTI.hasMethodTypeQualifiers() && !D.isInvalidType()) {
9761 bool DiagOccured = false;
9762 FTI.MethodQualifiers->forEachQualifier(
9763 [DiagID, &S, &DiagOccured](DeclSpec::TQ, StringRef QualName,
9764 SourceLocation SL) {
9765 // This diagnostic should be emitted on any qualifier except an addr
9766 // space qualifier. However, forEachQualifier currently doesn't visit
9767 // addr space qualifiers, so there's no way to write this condition
9768 // right now; we just diagnose on everything.
9769 S.Diag(SL, DiagID) << QualName << SourceRange(SL);
9770 DiagOccured = true;
9771 });
9772 if (DiagOccured)
9773 D.setInvalidType();
9774 }
9775}
9776
9777/// CheckConstructorDeclarator - Called by ActOnDeclarator to check
9778/// the well-formedness of the constructor declarator @p D with type @p
9779/// R. If there are any errors in the declarator, this routine will
9780/// emit diagnostics and set the invalid bit to true. In any case, the type
9781/// will be updated to reflect a well-formed type for the constructor and
9782/// returned.
9783QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R,
9784 StorageClass &SC) {
9785 bool isVirtual = D.getDeclSpec().isVirtualSpecified();
9786
9787 // C++ [class.ctor]p3:
9788 // A constructor shall not be virtual (10.3) or static (9.4). A
9789 // constructor can be invoked for a const, volatile or const
9790 // volatile object. A constructor shall not be declared const,
9791 // volatile, or const volatile (9.3.2).
9792 if (isVirtual) {
9793 if (!D.isInvalidType())
9794 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
9795 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc())
9796 << SourceRange(D.getIdentifierLoc());
9797 D.setInvalidType();
9798 }
9799 if (SC == SC_Static) {
9800 if (!D.isInvalidType())
9801 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
9802 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
9803 << SourceRange(D.getIdentifierLoc());
9804 D.setInvalidType();
9805 SC = SC_None;
9806 }
9807
9808 if (unsigned TypeQuals = D.getDeclSpec().getTypeQualifiers()) {
9809 diagnoseIgnoredQualifiers(
9810 diag::err_constructor_return_type, TypeQuals, SourceLocation(),
9811 D.getDeclSpec().getConstSpecLoc(), D.getDeclSpec().getVolatileSpecLoc(),
9812 D.getDeclSpec().getRestrictSpecLoc(),
9813 D.getDeclSpec().getAtomicSpecLoc());
9814 D.setInvalidType();
9815 }
9816
9817 checkMethodTypeQualifiers(*this, D, diag::err_invalid_qualified_constructor);
9818
9819 // C++0x [class.ctor]p4:
9820 // A constructor shall not be declared with a ref-qualifier.
9821 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
9822 if (FTI.hasRefQualifier()) {
9823 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor)
9824 << FTI.RefQualifierIsLValueRef
9825 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc());
9826 D.setInvalidType();
9827 }
9828
9829 // Rebuild the function type "R" without any type qualifiers (in
9830 // case any of the errors above fired) and with "void" as the
9831 // return type, since constructors don't have return types.
9832 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();
9833 if (Proto->getReturnType() == Context.VoidTy && !D.isInvalidType())
9834 return R;
9835
9836 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo();
9837 EPI.TypeQuals = Qualifiers();
9838 EPI.RefQualifier = RQ_None;
9839
9840 return Context.getFunctionType(Context.VoidTy, Proto->getParamTypes(), EPI);
9841}
9842
9843/// CheckConstructor - Checks a fully-formed constructor for
9844/// well-formedness, issuing any diagnostics required. Returns true if
9845/// the constructor declarator is invalid.
9846void Sema::CheckConstructor(CXXConstructorDecl *Constructor) {
9847 CXXRecordDecl *ClassDecl
9848 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext());
9849 if (!ClassDecl)
9850 return Constructor->setInvalidDecl();
9851
9852 // C++ [class.copy]p3:
9853 // A declaration of a constructor for a class X is ill-formed if
9854 // its first parameter is of type (optionally cv-qualified) X and
9855 // either there are no other parameters or else all other
9856 // parameters have default arguments.
9857 if (!Constructor->isInvalidDecl() &&
9858 ((Constructor->getNumParams() == 1) ||
9859 (Constructor->getNumParams() > 1 &&
9860 Constructor->getParamDecl(1)->hasDefaultArg())) &&
9861 Constructor->getTemplateSpecializationKind()
9862 != TSK_ImplicitInstantiation) {
9863 QualType ParamType = Constructor->getParamDecl(0)->getType();
9864 QualType ClassTy = Context.getTagDeclType(ClassDecl);
9865 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) {
9866 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation();
9867 const char *ConstRef
9868 = Constructor->getParamDecl(0)->getIdentifier() ? "const &"
9869 : " const &";
9870 Diag(ParamLoc, diag::err_constructor_byvalue_arg)
9871 << FixItHint::CreateInsertion(ParamLoc, ConstRef);
9872
9873 // FIXME: Rather that making the constructor invalid, we should endeavor
9874 // to fix the type.
9875 Constructor->setInvalidDecl();
9876 }
9877 }
9878}
9879
9880/// CheckDestructor - Checks a fully-formed destructor definition for
9881/// well-formedness, issuing any diagnostics required. Returns true
9882/// on error.
9883bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) {
9884 CXXRecordDecl *RD = Destructor->getParent();
9885
9886 if (!Destructor->getOperatorDelete() && Destructor->isVirtual()) {
9887 SourceLocation Loc;
9888
9889 if (!Destructor->isImplicit())
9890 Loc = Destructor->getLocation();
9891 else
9892 Loc = RD->getLocation();
9893
9894 // If we have a virtual destructor, look up the deallocation function
9895 if (FunctionDecl *OperatorDelete =
9896 FindDeallocationFunctionForDestructor(Loc, RD)) {
9897 Expr *ThisArg = nullptr;
9898
9899 // If the notional 'delete this' expression requires a non-trivial
9900 // conversion from 'this' to the type of a destroying operator delete's
9901 // first parameter, perform that conversion now.
9902 if (OperatorDelete->isDestroyingOperatorDelete()) {
9903 QualType ParamType = OperatorDelete->getParamDecl(0)->getType();
9904 if (!declaresSameEntity(ParamType->getAsCXXRecordDecl(), RD)) {
9905 // C++ [class.dtor]p13:
9906 // ... as if for the expression 'delete this' appearing in a
9907 // non-virtual destructor of the destructor's class.
9908 ContextRAII SwitchContext(*this, Destructor);
9909 ExprResult This =
9910 ActOnCXXThis(OperatorDelete->getParamDecl(0)->getLocation());
9911 assert(!This.isInvalid() && "couldn't form 'this' expr in dtor?")((!This.isInvalid() && "couldn't form 'this' expr in dtor?"
) ? static_cast<void> (0) : __assert_fail ("!This.isInvalid() && \"couldn't form 'this' expr in dtor?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 9911, __PRETTY_FUNCTION__))
;
9912 This = PerformImplicitConversion(This.get(), ParamType, AA_Passing);
9913 if (This.isInvalid()) {
9914 // FIXME: Register this as a context note so that it comes out
9915 // in the right order.
9916 Diag(Loc, diag::note_implicit_delete_this_in_destructor_here);
9917 return true;
9918 }
9919 ThisArg = This.get();
9920 }
9921 }
9922
9923 DiagnoseUseOfDecl(OperatorDelete, Loc);
9924 MarkFunctionReferenced(Loc, OperatorDelete);
9925 Destructor->setOperatorDelete(OperatorDelete, ThisArg);
9926 }
9927 }
9928
9929 return false;
9930}
9931
9932/// CheckDestructorDeclarator - Called by ActOnDeclarator to check
9933/// the well-formednes of the destructor declarator @p D with type @p
9934/// R. If there are any errors in the declarator, this routine will
9935/// emit diagnostics and set the declarator to invalid. Even if this happens,
9936/// will be updated to reflect a well-formed type for the destructor and
9937/// returned.
9938QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R,
9939 StorageClass& SC) {
9940 // C++ [class.dtor]p1:
9941 // [...] A typedef-name that names a class is a class-name
9942 // (7.1.3); however, a typedef-name that names a class shall not
9943 // be used as the identifier in the declarator for a destructor
9944 // declaration.
9945 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName);
9946 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>())
9947 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name)
9948 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl());
9949 else if (const TemplateSpecializationType *TST =
9950 DeclaratorType->getAs<TemplateSpecializationType>())
9951 if (TST->isTypeAlias())
9952 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name)
9953 << DeclaratorType << 1;
9954
9955 // C++ [class.dtor]p2:
9956 // A destructor is used to destroy objects of its class type. A
9957 // destructor takes no parameters, and no return type can be
9958 // specified for it (not even void). The address of a destructor
9959 // shall not be taken. A destructor shall not be static. A
9960 // destructor can be invoked for a const, volatile or const
9961 // volatile object. A destructor shall not be declared const,
9962 // volatile or const volatile (9.3.2).
9963 if (SC == SC_Static) {
9964 if (!D.isInvalidType())
9965 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be)
9966 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
9967 << SourceRange(D.getIdentifierLoc())
9968 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
9969
9970 SC = SC_None;
9971 }
9972 if (!D.isInvalidType()) {
9973 // Destructors don't have return types, but the parser will
9974 // happily parse something like:
9975 //
9976 // class X {
9977 // float ~X();
9978 // };
9979 //
9980 // The return type will be eliminated later.
9981 if (D.getDeclSpec().hasTypeSpecifier())
9982 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type)
9983 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
9984 << SourceRange(D.getIdentifierLoc());
9985 else if (unsigned TypeQuals = D.getDeclSpec().getTypeQualifiers()) {
9986 diagnoseIgnoredQualifiers(diag::err_destructor_return_type, TypeQuals,
9987 SourceLocation(),
9988 D.getDeclSpec().getConstSpecLoc(),
9989 D.getDeclSpec().getVolatileSpecLoc(),
9990 D.getDeclSpec().getRestrictSpecLoc(),
9991 D.getDeclSpec().getAtomicSpecLoc());
9992 D.setInvalidType();
9993 }
9994 }
9995
9996 checkMethodTypeQualifiers(*this, D, diag::err_invalid_qualified_destructor);
9997
9998 // C++0x [class.dtor]p2:
9999 // A destructor shall not be declared with a ref-qualifier.
10000 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
10001 if (FTI.hasRefQualifier()) {
10002 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor)
10003 << FTI.RefQualifierIsLValueRef
10004 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc());
10005 D.setInvalidType();
10006 }
10007
10008 // Make sure we don't have any parameters.
10009 if (FTIHasNonVoidParameters(FTI)) {
10010 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params);
10011
10012 // Delete the parameters.
10013 FTI.freeParams();
10014 D.setInvalidType();
10015 }
10016
10017 // Make sure the destructor isn't variadic.
10018 if (FTI.isVariadic) {
10019 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic);
10020 D.setInvalidType();
10021 }
10022
10023 // Rebuild the function type "R" without any type qualifiers or
10024 // parameters (in case any of the errors above fired) and with
10025 // "void" as the return type, since destructors don't have return
10026 // types.
10027 if (!D.isInvalidType())
10028 return R;
10029
10030 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();
10031 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo();
10032 EPI.Variadic = false;
10033 EPI.TypeQuals = Qualifiers();
10034 EPI.RefQualifier = RQ_None;
10035 return Context.getFunctionType(Context.VoidTy, None, EPI);
10036}
10037
10038static void extendLeft(SourceRange &R, SourceRange Before) {
10039 if (Before.isInvalid())
10040 return;
10041 R.setBegin(Before.getBegin());
10042 if (R.getEnd().isInvalid())
10043 R.setEnd(Before.getEnd());
10044}
10045
10046static void extendRight(SourceRange &R, SourceRange After) {
10047 if (After.isInvalid())
10048 return;
10049 if (R.getBegin().isInvalid())
10050 R.setBegin(After.getBegin());
10051 R.setEnd(After.getEnd());
10052}
10053
10054/// CheckConversionDeclarator - Called by ActOnDeclarator to check the
10055/// well-formednes of the conversion function declarator @p D with
10056/// type @p R. If there are any errors in the declarator, this routine
10057/// will emit diagnostics and return true. Otherwise, it will return
10058/// false. Either way, the type @p R will be updated to reflect a
10059/// well-formed type for the conversion operator.
10060void Sema::CheckConversionDeclarator(Declarator &D, QualType &R,
10061 StorageClass& SC) {
10062 // C++ [class.conv.fct]p1:
10063 // Neither parameter types nor return type can be specified. The
10064 // type of a conversion function (8.3.5) is "function taking no
10065 // parameter returning conversion-type-id."
10066 if (SC == SC_Static) {
10067 if (!D.isInvalidType())
10068 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member)
10069 << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
10070 << D.getName().getSourceRange();
10071 D.setInvalidType();
10072 SC = SC_None;
10073 }
10074
10075 TypeSourceInfo *ConvTSI = nullptr;
10076 QualType ConvType =
10077 GetTypeFromParser(D.getName().ConversionFunctionId, &ConvTSI);
10078
10079 const DeclSpec &DS = D.getDeclSpec();
10080 if (DS.hasTypeSpecifier() && !D.isInvalidType()) {
10081 // Conversion functions don't have return types, but the parser will
10082 // happily parse something like:
10083 //
10084 // class X {
10085 // float operator bool();
10086 // };
10087 //
10088 // The return type will be changed later anyway.
10089 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type)
10090 << SourceRange(DS.getTypeSpecTypeLoc())
10091 << SourceRange(D.getIdentifierLoc());
10092 D.setInvalidType();
10093 } else if (DS.getTypeQualifiers() && !D.isInvalidType()) {
10094 // It's also plausible that the user writes type qualifiers in the wrong
10095 // place, such as:
10096 // struct S { const operator int(); };
10097 // FIXME: we could provide a fixit to move the qualifiers onto the
10098 // conversion type.
10099 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl)
10100 << SourceRange(D.getIdentifierLoc()) << 0;
10101 D.setInvalidType();
10102 }
10103
10104 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();
10105
10106 // Make sure we don't have any parameters.
10107 if (Proto->getNumParams() > 0) {
10108 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params);
10109
10110 // Delete the parameters.
10111 D.getFunctionTypeInfo().freeParams();
10112 D.setInvalidType();
10113 } else if (Proto->isVariadic()) {
10114 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic);
10115 D.setInvalidType();
10116 }
10117
10118 // Diagnose "&operator bool()" and other such nonsense. This
10119 // is actually a gcc extension which we don't support.
10120 if (Proto->getReturnType() != ConvType) {
10121 bool NeedsTypedef = false;
10122 SourceRange Before, After;
10123
10124 // Walk the chunks and extract information on them for our diagnostic.
10125 bool PastFunctionChunk = false;
10126 for (auto &Chunk : D.type_objects()) {
10127 switch (Chunk.Kind) {
10128 case DeclaratorChunk::Function:
10129 if (!PastFunctionChunk) {
10130 if (Chunk.Fun.HasTrailingReturnType) {
10131 TypeSourceInfo *TRT = nullptr;
10132 GetTypeFromParser(Chunk.Fun.getTrailingReturnType(), &TRT);
10133 if (TRT) extendRight(After, TRT->getTypeLoc().getSourceRange());
10134 }
10135 PastFunctionChunk = true;
10136 break;
10137 }
10138 LLVM_FALLTHROUGH[[gnu::fallthrough]];
10139 case DeclaratorChunk::Array:
10140 NeedsTypedef = true;
10141 extendRight(After, Chunk.getSourceRange());
10142 break;
10143
10144 case DeclaratorChunk::Pointer:
10145 case DeclaratorChunk::BlockPointer:
10146 case DeclaratorChunk::Reference:
10147 case DeclaratorChunk::MemberPointer:
10148 case DeclaratorChunk::Pipe:
10149 extendLeft(Before, Chunk.getSourceRange());
10150 break;
10151
10152 case DeclaratorChunk::Paren:
10153 extendLeft(Before, Chunk.Loc);
10154 extendRight(After, Chunk.EndLoc);
10155 break;
10156 }
10157 }
10158
10159 SourceLocation Loc = Before.isValid() ? Before.getBegin() :
10160 After.isValid() ? After.getBegin() :
10161 D.getIdentifierLoc();
10162 auto &&DB = Diag(Loc, diag::err_conv_function_with_complex_decl);
10163 DB << Before << After;
10164
10165 if (!NeedsTypedef) {
10166 DB << /*don't need a typedef*/0;
10167
10168 // If we can provide a correct fix-it hint, do so.
10169 if (After.isInvalid() && ConvTSI) {
10170 SourceLocation InsertLoc =
10171 getLocForEndOfToken(ConvTSI->getTypeLoc().getEndLoc());
10172 DB << FixItHint::CreateInsertion(InsertLoc, " ")
10173 << FixItHint::CreateInsertionFromRange(
10174 InsertLoc, CharSourceRange::getTokenRange(Before))
10175 << FixItHint::CreateRemoval(Before);
10176 }
10177 } else if (!Proto->getReturnType()->isDependentType()) {
10178 DB << /*typedef*/1 << Proto->getReturnType();
10179 } else if (getLangOpts().CPlusPlus11) {
10180 DB << /*alias template*/2 << Proto->getReturnType();
10181 } else {
10182 DB << /*might not be fixable*/3;
10183 }
10184
10185 // Recover by incorporating the other type chunks into the result type.
10186 // Note, this does *not* change the name of the function. This is compatible
10187 // with the GCC extension:
10188 // struct S { &operator int(); } s;
10189 // int &r = s.operator int(); // ok in GCC
10190 // S::operator int&() {} // error in GCC, function name is 'operator int'.
10191 ConvType = Proto->getReturnType();
10192 }
10193
10194 // C++ [class.conv.fct]p4:
10195 // The conversion-type-id shall not represent a function type nor
10196 // an array type.
10197 if (ConvType->isArrayType()) {
10198 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array);
10199 ConvType = Context.getPointerType(ConvType);
10200 D.setInvalidType();
10201 } else if (ConvType->isFunctionType()) {
10202 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function);
10203 ConvType = Context.getPointerType(ConvType);
10204 D.setInvalidType();
10205 }
10206
10207 // Rebuild the function type "R" without any parameters (in case any
10208 // of the errors above fired) and with the conversion type as the
10209 // return type.
10210 if (D.isInvalidType())
10211 R = Context.getFunctionType(ConvType, None, Proto->getExtProtoInfo());
10212
10213 // C++0x explicit conversion operators.
10214 if (DS.hasExplicitSpecifier() && !getLangOpts().CPlusPlus2a)
10215 Diag(DS.getExplicitSpecLoc(),
10216 getLangOpts().CPlusPlus11
10217 ? diag::warn_cxx98_compat_explicit_conversion_functions
10218 : diag::ext_explicit_conversion_functions)
10219 << SourceRange(DS.getExplicitSpecRange());
10220}
10221
10222/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete
10223/// the declaration of the given C++ conversion function. This routine
10224/// is responsible for recording the conversion function in the C++
10225/// class, if possible.
10226Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) {
10227 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\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 10227, __PRETTY_FUNCTION__))
;
10228
10229 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext());
10230
10231 // Make sure we aren't redeclaring the conversion function.
10232 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType());
10233
10234 // C++ [class.conv.fct]p1:
10235 // [...] A conversion function is never used to convert a
10236 // (possibly cv-qualified) object to the (possibly cv-qualified)
10237 // same object type (or a reference to it), to a (possibly
10238 // cv-qualified) base class of that type (or a reference to it),
10239 // or to (possibly cv-qualified) void.
10240 // FIXME: Suppress this warning if the conversion function ends up being a
10241 // virtual function that overrides a virtual function in a base class.
10242 QualType ClassType
10243 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
10244 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>())
10245 ConvType = ConvTypeRef->getPointeeType();
10246 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared &&
10247 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization)
10248 /* Suppress diagnostics for instantiations. */;
10249 else if (ConvType->isRecordType()) {
10250 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType();
10251 if (ConvType == ClassType)
10252 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used)
10253 << ClassType;
10254 else if (IsDerivedFrom(Conversion->getLocation(), ClassType, ConvType))
10255 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used)
10256 << ClassType << ConvType;
10257 } else if (ConvType->isVoidType()) {
10258 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used)
10259 << ClassType << ConvType;
10260 }
10261
10262 if (FunctionTemplateDecl *ConversionTemplate
10263 = Conversion->getDescribedFunctionTemplate())
10264 return ConversionTemplate;
10265
10266 return Conversion;
10267}
10268
10269namespace {
10270/// Utility class to accumulate and print a diagnostic listing the invalid
10271/// specifier(s) on a declaration.
10272struct BadSpecifierDiagnoser {
10273 BadSpecifierDiagnoser(Sema &S, SourceLocation Loc, unsigned DiagID)
10274 : S(S), Diagnostic(S.Diag(Loc, DiagID)) {}
10275 ~BadSpecifierDiagnoser() {
10276 Diagnostic << Specifiers;
10277 }
10278
10279 template<typename T> void check(SourceLocation SpecLoc, T Spec) {
10280 return check(SpecLoc, DeclSpec::getSpecifierName(Spec));
10281 }
10282 void check(SourceLocation SpecLoc, DeclSpec::TST Spec) {
10283 return check(SpecLoc,
10284 DeclSpec::getSpecifierName(Spec, S.getPrintingPolicy()));
10285 }
10286 void check(SourceLocation SpecLoc, const char *Spec) {
10287 if (SpecLoc.isInvalid()) return;
10288 Diagnostic << SourceRange(SpecLoc, SpecLoc);
10289 if (!Specifiers.empty()) Specifiers += " ";
10290 Specifiers += Spec;
10291 }
10292
10293 Sema &S;
10294 Sema::SemaDiagnosticBuilder Diagnostic;
10295 std::string Specifiers;
10296};
10297}
10298
10299/// Check the validity of a declarator that we parsed for a deduction-guide.
10300/// These aren't actually declarators in the grammar, so we need to check that
10301/// the user didn't specify any pieces that are not part of the deduction-guide
10302/// grammar.
10303void Sema::CheckDeductionGuideDeclarator(Declarator &D, QualType &R,
10304 StorageClass &SC) {
10305 TemplateName GuidedTemplate = D.getName().TemplateName.get().get();
10306 TemplateDecl *GuidedTemplateDecl = GuidedTemplate.getAsTemplateDecl();
10307 assert(GuidedTemplateDecl && "missing template decl for deduction guide")((GuidedTemplateDecl && "missing template decl for deduction guide"
) ? static_cast<void> (0) : __assert_fail ("GuidedTemplateDecl && \"missing template decl for deduction guide\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 10307, __PRETTY_FUNCTION__))
;
10308
10309 // C++ [temp.deduct.guide]p3:
10310 // A deduction-gide shall be declared in the same scope as the
10311 // corresponding class template.
10312 if (!CurContext->getRedeclContext()->Equals(
10313 GuidedTemplateDecl->getDeclContext()->getRedeclContext())) {
10314 Diag(D.getIdentifierLoc(), diag::err_deduction_guide_wrong_scope)
10315 << GuidedTemplateDecl;
10316 Diag(GuidedTemplateDecl->getLocation(), diag::note_template_decl_here);
10317 }
10318
10319 auto &DS = D.getMutableDeclSpec();
10320 // We leave 'friend' and 'virtual' to be rejected in the normal way.
10321 if (DS.hasTypeSpecifier() || DS.getTypeQualifiers() ||
10322 DS.getStorageClassSpecLoc().isValid() || DS.isInlineSpecified() ||
10323 DS.isNoreturnSpecified() || DS.hasConstexprSpecifier()) {
10324 BadSpecifierDiagnoser Diagnoser(
10325 *this, D.getIdentifierLoc(),
10326 diag::err_deduction_guide_invalid_specifier);
10327
10328 Diagnoser.check(DS.getStorageClassSpecLoc(), DS.getStorageClassSpec());
10329 DS.ClearStorageClassSpecs();
10330 SC = SC_None;
10331
10332 // 'explicit' is permitted.
10333 Diagnoser.check(DS.getInlineSpecLoc(), "inline");
10334 Diagnoser.check(DS.getNoreturnSpecLoc(), "_Noreturn");
10335 Diagnoser.check(DS.getConstexprSpecLoc(), "constexpr");
10336 DS.ClearConstexprSpec();
10337
10338 Diagnoser.check(DS.getConstSpecLoc(), "const");
10339 Diagnoser.check(DS.getRestrictSpecLoc(), "__restrict");
10340 Diagnoser.check(DS.getVolatileSpecLoc(), "volatile");
10341 Diagnoser.check(DS.getAtomicSpecLoc(), "_Atomic");
10342 Diagnoser.check(DS.getUnalignedSpecLoc(), "__unaligned");
10343 DS.ClearTypeQualifiers();
10344
10345 Diagnoser.check(DS.getTypeSpecComplexLoc(), DS.getTypeSpecComplex());
10346 Diagnoser.check(DS.getTypeSpecSignLoc(), DS.getTypeSpecSign());
10347 Diagnoser.check(DS.getTypeSpecWidthLoc(), DS.getTypeSpecWidth());
10348 Diagnoser.check(DS.getTypeSpecTypeLoc(), DS.getTypeSpecType());
10349 DS.ClearTypeSpecType();
10350 }
10351
10352 if (D.isInvalidType())
10353 return;
10354
10355 // Check the declarator is simple enough.
10356 bool FoundFunction = false;
10357 for (const DeclaratorChunk &Chunk : llvm::reverse(D.type_objects())) {
10358 if (Chunk.Kind == DeclaratorChunk::Paren)
10359 continue;
10360 if (Chunk.Kind != DeclaratorChunk::Function || FoundFunction) {
10361 Diag(D.getDeclSpec().getBeginLoc(),
10362 diag::err_deduction_guide_with_complex_decl)
10363 << D.getSourceRange();
10364 break;
10365 }
10366 if (!Chunk.Fun.hasTrailingReturnType()) {
10367 Diag(D.getName().getBeginLoc(),
10368 diag::err_deduction_guide_no_trailing_return_type);
10369 break;
10370 }
10371
10372 // Check that the return type is written as a specialization of
10373 // the template specified as the deduction-guide's name.
10374 ParsedType TrailingReturnType = Chunk.Fun.getTrailingReturnType();
10375 TypeSourceInfo *TSI = nullptr;
10376 QualType RetTy = GetTypeFromParser(TrailingReturnType, &TSI);
10377 assert(TSI && "deduction guide has valid type but invalid return type?")((TSI && "deduction guide has valid type but invalid return type?"
) ? static_cast<void> (0) : __assert_fail ("TSI && \"deduction guide has valid type but invalid return type?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 10377, __PRETTY_FUNCTION__))
;
10378 bool AcceptableReturnType = false;
10379 bool MightInstantiateToSpecialization = false;
10380 if (auto RetTST =
10381 TSI->getTypeLoc().getAs<TemplateSpecializationTypeLoc>()) {
10382 TemplateName SpecifiedName = RetTST.getTypePtr()->getTemplateName();
10383 bool TemplateMatches =
10384 Context.hasSameTemplateName(SpecifiedName, GuidedTemplate);
10385 if (SpecifiedName.getKind() == TemplateName::Template && TemplateMatches)
10386 AcceptableReturnType = true;
10387 else {
10388 // This could still instantiate to the right type, unless we know it
10389 // names the wrong class template.
10390 auto *TD = SpecifiedName.getAsTemplateDecl();
10391 MightInstantiateToSpecialization = !(TD && isa<ClassTemplateDecl>(TD) &&
10392 !TemplateMatches);
10393 }
10394 } else if (!RetTy.hasQualifiers() && RetTy->isDependentType()) {
10395 MightInstantiateToSpecialization = true;
10396 }
10397
10398 if (!AcceptableReturnType) {
10399 Diag(TSI->getTypeLoc().getBeginLoc(),
10400 diag::err_deduction_guide_bad_trailing_return_type)
10401 << GuidedTemplate << TSI->getType()
10402 << MightInstantiateToSpecialization
10403 << TSI->getTypeLoc().getSourceRange();
10404 }
10405
10406 // Keep going to check that we don't have any inner declarator pieces (we
10407 // could still have a function returning a pointer to a function).
10408 FoundFunction = true;
10409 }
10410
10411 if (D.isFunctionDefinition())
10412 Diag(D.getIdentifierLoc(), diag::err_deduction_guide_defines_function);
10413}
10414
10415//===----------------------------------------------------------------------===//
10416// Namespace Handling
10417//===----------------------------------------------------------------------===//
10418
10419/// Diagnose a mismatch in 'inline' qualifiers when a namespace is
10420/// reopened.
10421static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc,
10422 SourceLocation Loc,
10423 IdentifierInfo *II, bool *IsInline,
10424 NamespaceDecl *PrevNS) {
10425 assert(*IsInline != PrevNS->isInline())((*IsInline != PrevNS->isInline()) ? static_cast<void>
(0) : __assert_fail ("*IsInline != PrevNS->isInline()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 10425, __PRETTY_FUNCTION__))
;
10426
10427 // HACK: Work around a bug in libstdc++4.6's <atomic>, where
10428 // std::__atomic[0,1,2] are defined as non-inline namespaces, then reopened as
10429 // inline namespaces, with the intention of bringing names into namespace std.
10430 //
10431 // We support this just well enough to get that case working; this is not
10432 // sufficient to support reopening namespaces as inline in general.
10433 if (*IsInline && II && II->getName().startswith("__atomic") &&
10434 S.getSourceManager().isInSystemHeader(Loc)) {
10435 // Mark all prior declarations of the namespace as inline.
10436 for (NamespaceDecl *NS = PrevNS->getMostRecentDecl(); NS;
10437 NS = NS->getPreviousDecl())
10438 NS->setInline(*IsInline);
10439 // Patch up the lookup table for the containing namespace. This isn't really
10440 // correct, but it's good enough for this particular case.
10441 for (auto *I : PrevNS->decls())
10442 if (auto *ND = dyn_cast<NamedDecl>(I))
10443 PrevNS->getParent()->makeDeclVisibleInContext(ND);
10444 return;
10445 }
10446
10447 if (PrevNS->isInline())
10448 // The user probably just forgot the 'inline', so suggest that it
10449 // be added back.
10450 S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline)
10451 << FixItHint::CreateInsertion(KeywordLoc, "inline ");
10452 else
10453 S.Diag(Loc, diag::err_inline_namespace_mismatch);
10454
10455 S.Diag(PrevNS->getLocation(), diag::note_previous_definition);
10456 *IsInline = PrevNS->isInline();
10457}
10458
10459/// ActOnStartNamespaceDef - This is called at the start of a namespace
10460/// definition.
10461Decl *Sema::ActOnStartNamespaceDef(
10462 Scope *NamespcScope, SourceLocation InlineLoc, SourceLocation NamespaceLoc,
10463 SourceLocation IdentLoc, IdentifierInfo *II, SourceLocation LBrace,
10464 const ParsedAttributesView &AttrList, UsingDirectiveDecl *&UD) {
10465 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc;
10466 // For anonymous namespace, take the location of the left brace.
10467 SourceLocation Loc = II ? IdentLoc : LBrace;
10468 bool IsInline = InlineLoc.isValid();
10469 bool IsInvalid = false;
10470 bool IsStd = false;
10471 bool AddToKnown = false;
10472 Scope *DeclRegionScope = NamespcScope->getParent();
10473
10474 NamespaceDecl *PrevNS = nullptr;
10475 if (II) {
10476 // C++ [namespace.def]p2:
10477 // The identifier in an original-namespace-definition shall not
10478 // have been previously defined in the declarative region in
10479 // which the original-namespace-definition appears. The
10480 // identifier in an original-namespace-definition is the name of
10481 // the namespace. Subsequently in that declarative region, it is
10482 // treated as an original-namespace-name.
10483 //
10484 // Since namespace names are unique in their scope, and we don't
10485 // look through using directives, just look for any ordinary names
10486 // as if by qualified name lookup.
10487 LookupResult R(*this, II, IdentLoc, LookupOrdinaryName,
10488 ForExternalRedeclaration);
10489 LookupQualifiedName(R, CurContext->getRedeclContext());
10490 NamedDecl *PrevDecl =
10491 R.isSingleResult() ? R.getRepresentativeDecl() : nullptr;
10492 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl);
10493
10494 if (PrevNS) {
10495 // This is an extended namespace definition.
10496 if (IsInline != PrevNS->isInline())
10497 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, Loc, II,
10498 &IsInline, PrevNS);
10499 } else if (PrevDecl) {
10500 // This is an invalid name redefinition.
10501 Diag(Loc, diag::err_redefinition_different_kind)
10502 << II;
10503 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
10504 IsInvalid = true;
10505 // Continue on to push Namespc as current DeclContext and return it.
10506 } else if (II->isStr("std") &&
10507 CurContext->getRedeclContext()->isTranslationUnit()) {
10508 // This is the first "real" definition of the namespace "std", so update
10509 // our cache of the "std" namespace to point at this definition.
10510 PrevNS = getStdNamespace();
10511 IsStd = true;
10512 AddToKnown = !IsInline;
10513 } else {
10514 // We've seen this namespace for the first time.
10515 AddToKnown = !IsInline;
10516 }
10517 } else {
10518 // Anonymous namespaces.
10519
10520 // Determine whether the parent already has an anonymous namespace.
10521 DeclContext *Parent = CurContext->getRedeclContext();
10522 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) {
10523 PrevNS = TU->getAnonymousNamespace();
10524 } else {
10525 NamespaceDecl *ND = cast<NamespaceDecl>(Parent);
10526 PrevNS = ND->getAnonymousNamespace();
10527 }
10528
10529 if (PrevNS && IsInline != PrevNS->isInline())
10530 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, NamespaceLoc, II,
10531 &IsInline, PrevNS);
10532 }
10533
10534 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline,
10535 StartLoc, Loc, II, PrevNS);
10536 if (IsInvalid)
10537 Namespc->setInvalidDecl();
10538
10539 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList);
10540 AddPragmaAttributes(DeclRegionScope, Namespc);
10541
10542 // FIXME: Should we be merging attributes?
10543 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>())
10544 PushNamespaceVisibilityAttr(Attr, Loc);
10545
10546 if (IsStd)
10547 StdNamespace = Namespc;
10548 if (AddToKnown)
10549 KnownNamespaces[Namespc] = false;
10550
10551 if (II) {
10552 PushOnScopeChains(Namespc, DeclRegionScope);
10553 } else {
10554 // Link the anonymous namespace into its parent.
10555 DeclContext *Parent = CurContext->getRedeclContext();
10556 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) {
10557 TU->setAnonymousNamespace(Namespc);
10558 } else {
10559 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc);
10560 }
10561
10562 CurContext->addDecl(Namespc);
10563
10564 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition
10565 // behaves as if it were replaced by
10566 // namespace unique { /* empty body */ }
10567 // using namespace unique;
10568 // namespace unique { namespace-body }
10569 // where all occurrences of 'unique' in a translation unit are
10570 // replaced by the same identifier and this identifier differs
10571 // from all other identifiers in the entire program.
10572
10573 // We just create the namespace with an empty name and then add an
10574 // implicit using declaration, just like the standard suggests.
10575 //
10576 // CodeGen enforces the "universally unique" aspect by giving all
10577 // declarations semantically contained within an anonymous
10578 // namespace internal linkage.
10579
10580 if (!PrevNS) {
10581 UD = UsingDirectiveDecl::Create(Context, Parent,
10582 /* 'using' */ LBrace,
10583 /* 'namespace' */ SourceLocation(),
10584 /* qualifier */ NestedNameSpecifierLoc(),
10585 /* identifier */ SourceLocation(),
10586 Namespc,
10587 /* Ancestor */ Parent);
10588 UD->setImplicit();
10589 Parent->addDecl(UD);
10590 }
10591 }
10592
10593 ActOnDocumentableDecl(Namespc);
10594
10595 // Although we could have an invalid decl (i.e. the namespace name is a
10596 // redefinition), push it as current DeclContext and try to continue parsing.
10597 // FIXME: We should be able to push Namespc here, so that the each DeclContext
10598 // for the namespace has the declarations that showed up in that particular
10599 // namespace definition.
10600 PushDeclContext(NamespcScope, Namespc);
10601 return Namespc;
10602}
10603
10604/// getNamespaceDecl - Returns the namespace a decl represents. If the decl
10605/// is a namespace alias, returns the namespace it points to.
10606static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) {
10607 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D))
10608 return AD->getNamespace();
10609 return dyn_cast_or_null<NamespaceDecl>(D);
10610}
10611
10612/// ActOnFinishNamespaceDef - This callback is called after a namespace is
10613/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef.
10614void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) {
10615 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl);
10616 assert(Namespc && "Invalid parameter, expected NamespaceDecl")((Namespc && "Invalid parameter, expected NamespaceDecl"
) ? static_cast<void> (0) : __assert_fail ("Namespc && \"Invalid parameter, expected NamespaceDecl\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 10616, __PRETTY_FUNCTION__))
;
10617 Namespc->setRBraceLoc(RBrace);
10618 PopDeclContext();
10619 if (Namespc->hasAttr<VisibilityAttr>())
10620 PopPragmaVisibility(true, RBrace);
10621 // If this namespace contains an export-declaration, export it now.
10622 if (DeferredExportedNamespaces.erase(Namespc))
10623 Dcl->setModuleOwnershipKind(Decl::ModuleOwnershipKind::VisibleWhenImported);
10624}
10625
10626CXXRecordDecl *Sema::getStdBadAlloc() const {
10627 return cast_or_null<CXXRecordDecl>(
10628 StdBadAlloc.get(Context.getExternalSource()));
10629}
10630
10631EnumDecl *Sema::getStdAlignValT() const {
10632 return cast_or_null<EnumDecl>(StdAlignValT.get(Context.getExternalSource()));
10633}
10634
10635NamespaceDecl *Sema::getStdNamespace() const {
10636 return cast_or_null<NamespaceDecl>(
10637 StdNamespace.get(Context.getExternalSource()));
10638}
10639
10640NamespaceDecl *Sema::lookupStdExperimentalNamespace() {
10641 if (!StdExperimentalNamespaceCache) {
10642 if (auto Std = getStdNamespace()) {
10643 LookupResult Result(*this, &PP.getIdentifierTable().get("experimental"),
10644 SourceLocation(), LookupNamespaceName);
10645 if (!LookupQualifiedName(Result, Std) ||
10646 !(StdExperimentalNamespaceCache =
10647 Result.getAsSingle<NamespaceDecl>()))
10648 Result.suppressDiagnostics();
10649 }
10650 }
10651 return StdExperimentalNamespaceCache;
10652}
10653
10654namespace {
10655
10656enum UnsupportedSTLSelect {
10657 USS_InvalidMember,
10658 USS_MissingMember,
10659 USS_NonTrivial,
10660 USS_Other
10661};
10662
10663struct InvalidSTLDiagnoser {
10664 Sema &S;
10665 SourceLocation Loc;
10666 QualType TyForDiags;
10667
10668 QualType operator()(UnsupportedSTLSelect Sel = USS_Other, StringRef Name = "",
10669 const VarDecl *VD = nullptr) {
10670 {
10671 auto D = S.Diag(Loc, diag::err_std_compare_type_not_supported)
10672 << TyForDiags << ((int)Sel);
10673 if (Sel == USS_InvalidMember || Sel == USS_MissingMember) {
10674 assert(!Name.empty())((!Name.empty()) ? static_cast<void> (0) : __assert_fail
("!Name.empty()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 10674, __PRETTY_FUNCTION__))
;
10675 D << Name;
10676 }
10677 }
10678 if (Sel == USS_InvalidMember) {
10679 S.Diag(VD->getLocation(), diag::note_var_declared_here)
10680 << VD << VD->getSourceRange();
10681 }
10682 return QualType();
10683 }
10684};
10685} // namespace
10686
10687QualType Sema::CheckComparisonCategoryType(ComparisonCategoryType Kind,
10688 SourceLocation Loc,
10689 ComparisonCategoryUsage Usage) {
10690 assert(getLangOpts().CPlusPlus &&((getLangOpts().CPlusPlus && "Looking for comparison category type outside of C++."
) ? static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus && \"Looking for comparison category type outside of C++.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 10691, __PRETTY_FUNCTION__))
10691 "Looking for comparison category type outside of C++.")((getLangOpts().CPlusPlus && "Looking for comparison category type outside of C++."
) ? static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus && \"Looking for comparison category type outside of C++.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 10691, __PRETTY_FUNCTION__))
;
10692
10693 // Use an elaborated type for diagnostics which has a name containing the
10694 // prepended 'std' namespace but not any inline namespace names.
10695 auto TyForDiags = [&](ComparisonCategoryInfo *Info) {
10696 auto *NNS =
10697 NestedNameSpecifier::Create(Context, nullptr, getStdNamespace());
10698 return Context.getElaboratedType(ETK_None, NNS, Info->getType());
10699 };
10700
10701 // Check if we've already successfully checked the comparison category type
10702 // before. If so, skip checking it again.
10703 ComparisonCategoryInfo *Info = Context.CompCategories.lookupInfo(Kind);
10704 if (Info && FullyCheckedComparisonCategories[static_cast<unsigned>(Kind)]) {
10705 // The only thing we need to check is that the type has a reachable
10706 // definition in the current context.
10707 if (RequireCompleteType(Loc, TyForDiags(Info), diag::err_incomplete_type))
10708 return QualType();
10709
10710 return Info->getType();
10711 }
10712
10713 // If lookup failed
10714 if (!Info) {
10715 std::string NameForDiags = "std::";
10716 NameForDiags += ComparisonCategories::getCategoryString(Kind);
10717 Diag(Loc, diag::err_implied_comparison_category_type_not_found)
10718 << NameForDiags << (int)Usage;
10719 return QualType();
10720 }
10721
10722 assert(Info->Kind == Kind)((Info->Kind == Kind) ? static_cast<void> (0) : __assert_fail
("Info->Kind == Kind", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 10722, __PRETTY_FUNCTION__))
;
10723 assert(Info->Record)((Info->Record) ? static_cast<void> (0) : __assert_fail
("Info->Record", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 10723, __PRETTY_FUNCTION__))
;
10724
10725 // Update the Record decl in case we encountered a forward declaration on our
10726 // first pass. FIXME: This is a bit of a hack.
10727 if (Info->Record->hasDefinition())
10728 Info->Record = Info->Record->getDefinition();
10729
10730 if (RequireCompleteType(Loc, TyForDiags(Info), diag::err_incomplete_type))
10731 return QualType();
10732
10733 InvalidSTLDiagnoser UnsupportedSTLError{*this, Loc, TyForDiags(Info)};
10734
10735 if (!Info->Record->isTriviallyCopyable())
10736 return UnsupportedSTLError(USS_NonTrivial);
10737
10738 for (const CXXBaseSpecifier &BaseSpec : Info->Record->bases()) {
10739 CXXRecordDecl *Base = BaseSpec.getType()->getAsCXXRecordDecl();
10740 // Tolerate empty base classes.
10741 if (Base->isEmpty())
10742 continue;
10743 // Reject STL implementations which have at least one non-empty base.
10744 return UnsupportedSTLError();
10745 }
10746
10747 // Check that the STL has implemented the types using a single integer field.
10748 // This expectation allows better codegen for builtin operators. We require:
10749 // (1) The class has exactly one field.
10750 // (2) The field is an integral or enumeration type.
10751 auto FIt = Info->Record->field_begin(), FEnd = Info->Record->field_end();
10752 if (std::distance(FIt, FEnd) != 1 ||
10753 !FIt->getType()->isIntegralOrEnumerationType()) {
10754 return UnsupportedSTLError();
10755 }
10756
10757 // Build each of the require values and store them in Info.
10758 for (ComparisonCategoryResult CCR :
10759 ComparisonCategories::getPossibleResultsForType(Kind)) {
10760 StringRef MemName = ComparisonCategories::getResultString(CCR);
10761 ComparisonCategoryInfo::ValueInfo *ValInfo = Info->lookupValueInfo(CCR);
10762
10763 if (!ValInfo)
10764 return UnsupportedSTLError(USS_MissingMember, MemName);
10765
10766 VarDecl *VD = ValInfo->VD;
10767 assert(VD && "should not be null!")((VD && "should not be null!") ? static_cast<void>
(0) : __assert_fail ("VD && \"should not be null!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 10767, __PRETTY_FUNCTION__))
;
10768
10769 // Attempt to diagnose reasons why the STL definition of this type
10770 // might be foobar, including it failing to be a constant expression.
10771 // TODO Handle more ways the lookup or result can be invalid.
10772 if (!VD->isStaticDataMember() || !VD->isConstexpr() || !VD->hasInit() ||
10773 !VD->checkInitIsICE())
10774 return UnsupportedSTLError(USS_InvalidMember, MemName, VD);
10775
10776 // Attempt to evaluate the var decl as a constant expression and extract
10777 // the value of its first field as a ICE. If this fails, the STL
10778 // implementation is not supported.
10779 if (!ValInfo->hasValidIntValue())
10780 return UnsupportedSTLError();
10781
10782 MarkVariableReferenced(Loc, VD);
10783 }
10784
10785 // We've successfully built the required types and expressions. Update
10786 // the cache and return the newly cached value.
10787 FullyCheckedComparisonCategories[static_cast<unsigned>(Kind)] = true;
10788 return Info->getType();
10789}
10790
10791/// Retrieve the special "std" namespace, which may require us to
10792/// implicitly define the namespace.
10793NamespaceDecl *Sema::getOrCreateStdNamespace() {
10794 if (!StdNamespace) {
10795 // The "std" namespace has not yet been defined, so build one implicitly.
10796 StdNamespace = NamespaceDecl::Create(Context,
10797 Context.getTranslationUnitDecl(),
10798 /*Inline=*/false,
10799 SourceLocation(), SourceLocation(),
10800 &PP.getIdentifierTable().get("std"),
10801 /*PrevDecl=*/nullptr);
10802 getStdNamespace()->setImplicit(true);
10803 }
10804
10805 return getStdNamespace();
10806}
10807
10808bool Sema::isStdInitializerList(QualType Ty, QualType *Element) {
10809 assert(getLangOpts().CPlusPlus &&((getLangOpts().CPlusPlus && "Looking for std::initializer_list outside of C++."
) ? static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus && \"Looking for std::initializer_list outside of C++.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 10810, __PRETTY_FUNCTION__))
10810 "Looking for std::initializer_list outside of C++.")((getLangOpts().CPlusPlus && "Looking for std::initializer_list outside of C++."
) ? static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus && \"Looking for std::initializer_list outside of C++.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 10810, __PRETTY_FUNCTION__))
;
10811
10812 // We're looking for implicit instantiations of
10813 // template <typename E> class std::initializer_list.
10814
10815 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it.
10816 return false;
10817
10818 ClassTemplateDecl *Template = nullptr;
10819 const TemplateArgument *Arguments = nullptr;
10820
10821 if (const RecordType *RT = Ty->getAs<RecordType>()) {
10822
10823 ClassTemplateSpecializationDecl *Specialization =
10824 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl());
10825 if (!Specialization)
10826 return false;
10827
10828 Template = Specialization->getSpecializedTemplate();
10829 Arguments = Specialization->getTemplateArgs().data();
10830 } else if (const TemplateSpecializationType *TST =
10831 Ty->getAs<TemplateSpecializationType>()) {
10832 Template = dyn_cast_or_null<ClassTemplateDecl>(
10833 TST->getTemplateName().getAsTemplateDecl());
10834 Arguments = TST->getArgs();
10835 }
10836 if (!Template)
10837 return false;
10838
10839 if (!StdInitializerList) {
10840 // Haven't recognized std::initializer_list yet, maybe this is it.
10841 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl();
10842 if (TemplateClass->getIdentifier() !=
10843 &PP.getIdentifierTable().get("initializer_list") ||
10844 !getStdNamespace()->InEnclosingNamespaceSetOf(
10845 TemplateClass->getDeclContext()))
10846 return false;
10847 // This is a template called std::initializer_list, but is it the right
10848 // template?
10849 TemplateParameterList *Params = Template->getTemplateParameters();
10850 if (Params->getMinRequiredArguments() != 1)
10851 return false;
10852 if (!isa<TemplateTypeParmDecl>(Params->getParam(0)))
10853 return false;
10854
10855 // It's the right template.
10856 StdInitializerList = Template;
10857 }
10858
10859 if (Template->getCanonicalDecl() != StdInitializerList->getCanonicalDecl())
10860 return false;
10861
10862 // This is an instance of std::initializer_list. Find the argument type.
10863 if (Element)
10864 *Element = Arguments[0].getAsType();
10865 return true;
10866}
10867
10868static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){
10869 NamespaceDecl *Std = S.getStdNamespace();
10870 if (!Std) {
10871 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found);
10872 return nullptr;
10873 }
10874
10875 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"),
10876 Loc, Sema::LookupOrdinaryName);
10877 if (!S.LookupQualifiedName(Result, Std)) {
10878 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found);
10879 return nullptr;
10880 }
10881 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>();
10882 if (!Template) {
10883 Result.suppressDiagnostics();
10884 // We found something weird. Complain about the first thing we found.
10885 NamedDecl *Found = *Result.begin();
10886 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list);
10887 return nullptr;
10888 }
10889
10890 // We found some template called std::initializer_list. Now verify that it's
10891 // correct.
10892 TemplateParameterList *Params = Template->getTemplateParameters();
10893 if (Params->getMinRequiredArguments() != 1 ||
10894 !isa<TemplateTypeParmDecl>(Params->getParam(0))) {
10895 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list);
10896 return nullptr;
10897 }
10898
10899 return Template;
10900}
10901
10902QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) {
10903 if (!StdInitializerList) {
10904 StdInitializerList = LookupStdInitializerList(*this, Loc);
10905 if (!StdInitializerList)
10906 return QualType();
10907 }
10908
10909 TemplateArgumentListInfo Args(Loc, Loc);
10910 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element),
10911 Context.getTrivialTypeSourceInfo(Element,
10912 Loc)));
10913 return Context.getCanonicalType(
10914 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args));
10915}
10916
10917bool Sema::isInitListConstructor(const FunctionDecl *Ctor) {
10918 // C++ [dcl.init.list]p2:
10919 // A constructor is an initializer-list constructor if its first parameter
10920 // is of type std::initializer_list<E> or reference to possibly cv-qualified
10921 // std::initializer_list<E> for some type E, and either there are no other
10922 // parameters or else all other parameters have default arguments.
10923 if (Ctor->getNumParams() < 1 ||
10924 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg()))
10925 return false;
10926
10927 QualType ArgType = Ctor->getParamDecl(0)->getType();
10928 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>())
10929 ArgType = RT->getPointeeType().getUnqualifiedType();
10930
10931 return isStdInitializerList(ArgType, nullptr);
10932}
10933
10934/// Determine whether a using statement is in a context where it will be
10935/// apply in all contexts.
10936static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) {
10937 switch (CurContext->getDeclKind()) {
10938 case Decl::TranslationUnit:
10939 return true;
10940 case Decl::LinkageSpec:
10941 return IsUsingDirectiveInToplevelContext(CurContext->getParent());
10942 default:
10943 return false;
10944 }
10945}
10946
10947namespace {
10948
10949// Callback to only accept typo corrections that are namespaces.
10950class NamespaceValidatorCCC final : public CorrectionCandidateCallback {
10951public:
10952 bool ValidateCandidate(const TypoCorrection &candidate) override {
10953 if (NamedDecl *ND = candidate.getCorrectionDecl())
10954 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND);
10955 return false;
10956 }
10957
10958 std::unique_ptr<CorrectionCandidateCallback> clone() override {
10959 return std::make_unique<NamespaceValidatorCCC>(*this);
10960 }
10961};
10962
10963}
10964
10965static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc,
10966 CXXScopeSpec &SS,
10967 SourceLocation IdentLoc,
10968 IdentifierInfo *Ident) {
10969 R.clear();
10970 NamespaceValidatorCCC CCC{};
10971 if (TypoCorrection Corrected =
10972 S.CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), Sc, &SS, CCC,
10973 Sema::CTK_ErrorRecovery)) {
10974 if (DeclContext *DC = S.computeDeclContext(SS, false)) {
10975 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts()));
10976 bool DroppedSpecifier = Corrected.WillReplaceSpecifier() &&
10977 Ident->getName().equals(CorrectedStr);
10978 S.diagnoseTypo(Corrected,
10979 S.PDiag(diag::err_using_directive_member_suggest)
10980 << Ident << DC << DroppedSpecifier << SS.getRange(),
10981 S.PDiag(diag::note_namespace_defined_here));
10982 } else {
10983 S.diagnoseTypo(Corrected,
10984 S.PDiag(diag::err_using_directive_suggest) << Ident,
10985 S.PDiag(diag::note_namespace_defined_here));
10986 }
10987 R.addDecl(Corrected.getFoundDecl());
10988 return true;
10989 }
10990 return false;
10991}
10992
10993Decl *Sema::ActOnUsingDirective(Scope *S, SourceLocation UsingLoc,
10994 SourceLocation NamespcLoc, CXXScopeSpec &SS,
10995 SourceLocation IdentLoc,
10996 IdentifierInfo *NamespcName,
10997 const ParsedAttributesView &AttrList) {
10998 assert(!SS.isInvalid() && "Invalid CXXScopeSpec.")((!SS.isInvalid() && "Invalid CXXScopeSpec.") ? static_cast
<void> (0) : __assert_fail ("!SS.isInvalid() && \"Invalid CXXScopeSpec.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 10998, __PRETTY_FUNCTION__))
;
10999 assert(NamespcName && "Invalid NamespcName.")((NamespcName && "Invalid NamespcName.") ? static_cast
<void> (0) : __assert_fail ("NamespcName && \"Invalid NamespcName.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 10999, __PRETTY_FUNCTION__))
;
11000 assert(IdentLoc.isValid() && "Invalid NamespceName location.")((IdentLoc.isValid() && "Invalid NamespceName location."
) ? static_cast<void> (0) : __assert_fail ("IdentLoc.isValid() && \"Invalid NamespceName location.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 11000, __PRETTY_FUNCTION__))
;
11001
11002 // This can only happen along a recovery path.
11003 while (S->isTemplateParamScope())
11004 S = S->getParent();
11005 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.")((S->getFlags() & Scope::DeclScope && "Invalid Scope."
) ? static_cast<void> (0) : __assert_fail ("S->getFlags() & Scope::DeclScope && \"Invalid Scope.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 11005, __PRETTY_FUNCTION__))
;
11006
11007 UsingDirectiveDecl *UDir = nullptr;
11008 NestedNameSpecifier *Qualifier = nullptr;
11009 if (SS.isSet())
11010 Qualifier = SS.getScopeRep();
11011
11012 // Lookup namespace name.
11013 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName);
11014 LookupParsedName(R, S, &SS);
11015 if (R.isAmbiguous())
11016 return nullptr;
11017
11018 if (R.empty()) {
11019 R.clear();
11020 // Allow "using namespace std;" or "using namespace ::std;" even if
11021 // "std" hasn't been defined yet, for GCC compatibility.
11022 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) &&
11023 NamespcName->isStr("std")) {
11024 Diag(IdentLoc, diag::ext_using_undefined_std);
11025 R.addDecl(getOrCreateStdNamespace());
11026 R.resolveKind();
11027 }
11028 // Otherwise, attempt typo correction.
11029 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName);
11030 }
11031
11032 if (!R.empty()) {
11033 NamedDecl *Named = R.getRepresentativeDecl();
11034 NamespaceDecl *NS = R.getAsSingle<NamespaceDecl>();
11035 assert(NS && "expected namespace decl")((NS && "expected namespace decl") ? static_cast<void
> (0) : __assert_fail ("NS && \"expected namespace decl\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 11035, __PRETTY_FUNCTION__))
;
11036
11037 // The use of a nested name specifier may trigger deprecation warnings.
11038 DiagnoseUseOfDecl(Named, IdentLoc);
11039
11040 // C++ [namespace.udir]p1:
11041 // A using-directive specifies that the names in the nominated
11042 // namespace can be used in the scope in which the
11043 // using-directive appears after the using-directive. During
11044 // unqualified name lookup (3.4.1), the names appear as if they
11045 // were declared in the nearest enclosing namespace which
11046 // contains both the using-directive and the nominated
11047 // namespace. [Note: in this context, "contains" means "contains
11048 // directly or indirectly". ]
11049
11050 // Find enclosing context containing both using-directive and
11051 // nominated namespace.
11052 DeclContext *CommonAncestor = NS;
11053 while (CommonAncestor && !CommonAncestor->Encloses(CurContext))
11054 CommonAncestor = CommonAncestor->getParent();
11055
11056 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc,
11057 SS.getWithLocInContext(Context),
11058 IdentLoc, Named, CommonAncestor);
11059
11060 if (IsUsingDirectiveInToplevelContext(CurContext) &&
11061 !SourceMgr.isInMainFile(SourceMgr.getExpansionLoc(IdentLoc))) {
11062 Diag(IdentLoc, diag::warn_using_directive_in_header);
11063 }
11064
11065 PushUsingDirective(S, UDir);
11066 } else {
11067 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange();
11068 }
11069
11070 if (UDir)
11071 ProcessDeclAttributeList(S, UDir, AttrList);
11072
11073 return UDir;
11074}
11075
11076void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) {
11077 // If the scope has an associated entity and the using directive is at
11078 // namespace or translation unit scope, add the UsingDirectiveDecl into
11079 // its lookup structure so qualified name lookup can find it.
11080 DeclContext *Ctx = S->getEntity();
11081 if (Ctx && !Ctx->isFunctionOrMethod())
11082 Ctx->addDecl(UDir);
11083 else
11084 // Otherwise, it is at block scope. The using-directives will affect lookup
11085 // only to the end of the scope.
11086 S->PushUsingDirective(UDir);
11087}
11088
11089Decl *Sema::ActOnUsingDeclaration(Scope *S, AccessSpecifier AS,
11090 SourceLocation UsingLoc,
11091 SourceLocation TypenameLoc, CXXScopeSpec &SS,
11092 UnqualifiedId &Name,
11093 SourceLocation EllipsisLoc,
11094 const ParsedAttributesView &AttrList) {
11095 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.")((S->getFlags() & Scope::DeclScope && "Invalid Scope."
) ? static_cast<void> (0) : __assert_fail ("S->getFlags() & Scope::DeclScope && \"Invalid Scope.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 11095, __PRETTY_FUNCTION__))
;
11096
11097 if (SS.isEmpty()) {
11098 Diag(Name.getBeginLoc(), diag::err_using_requires_qualname);
11099 return nullptr;
11100 }
11101
11102 switch (Name.getKind()) {
11103 case UnqualifiedIdKind::IK_ImplicitSelfParam:
11104 case UnqualifiedIdKind::IK_Identifier:
11105 case UnqualifiedIdKind::IK_OperatorFunctionId:
11106 case UnqualifiedIdKind::IK_LiteralOperatorId:
11107 case UnqualifiedIdKind::IK_ConversionFunctionId:
11108 break;
11109
11110 case UnqualifiedIdKind::IK_ConstructorName:
11111 case UnqualifiedIdKind::IK_ConstructorTemplateId:
11112 // C++11 inheriting constructors.
11113 Diag(Name.getBeginLoc(),
11114 getLangOpts().CPlusPlus11
11115 ? diag::warn_cxx98_compat_using_decl_constructor
11116 : diag::err_using_decl_constructor)
11117 << SS.getRange();
11118
11119 if (getLangOpts().CPlusPlus11) break;
11120
11121 return nullptr;
11122
11123 case UnqualifiedIdKind::IK_DestructorName:
11124 Diag(Name.getBeginLoc(), diag::err_using_decl_destructor) << SS.getRange();
11125 return nullptr;
11126
11127 case UnqualifiedIdKind::IK_TemplateId:
11128 Diag(Name.getBeginLoc(), diag::err_using_decl_template_id)
11129 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc);
11130 return nullptr;
11131
11132 case UnqualifiedIdKind::IK_DeductionGuideName:
11133 llvm_unreachable("cannot parse qualified deduction guide name")::llvm::llvm_unreachable_internal("cannot parse qualified deduction guide name"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 11133)
;
11134 }
11135
11136 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name);
11137 DeclarationName TargetName = TargetNameInfo.getName();
11138 if (!TargetName)
11139 return nullptr;
11140
11141 // Warn about access declarations.
11142 if (UsingLoc.isInvalid()) {
11143 Diag(Name.getBeginLoc(), getLangOpts().CPlusPlus11
11144 ? diag::err_access_decl
11145 : diag::warn_access_decl_deprecated)
11146 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using ");
11147 }
11148
11149 if (EllipsisLoc.isInvalid()) {
11150 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) ||
11151 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration))
11152 return nullptr;
11153 } else {
11154 if (!SS.getScopeRep()->containsUnexpandedParameterPack() &&
11155 !TargetNameInfo.containsUnexpandedParameterPack()) {
11156 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs)
11157 << SourceRange(SS.getBeginLoc(), TargetNameInfo.getEndLoc());
11158 EllipsisLoc = SourceLocation();
11159 }
11160 }
11161
11162 NamedDecl *UD =
11163 BuildUsingDeclaration(S, AS, UsingLoc, TypenameLoc.isValid(), TypenameLoc,
11164 SS, TargetNameInfo, EllipsisLoc, AttrList,
11165 /*IsInstantiation*/false);
11166 if (UD)
11167 PushOnScopeChains(UD, S, /*AddToContext*/ false);
11168
11169 return UD;
11170}
11171
11172/// Determine whether a using declaration considers the given
11173/// declarations as "equivalent", e.g., if they are redeclarations of
11174/// the same entity or are both typedefs of the same type.
11175static bool
11176IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2) {
11177 if (D1->getCanonicalDecl() == D2->getCanonicalDecl())
11178 return true;
11179
11180 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1))
11181 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2))
11182 return Context.hasSameType(TD1->getUnderlyingType(),
11183 TD2->getUnderlyingType());
11184
11185 return false;
11186}
11187
11188
11189/// Determines whether to create a using shadow decl for a particular
11190/// decl, given the set of decls existing prior to this using lookup.
11191bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig,
11192 const LookupResult &Previous,
11193 UsingShadowDecl *&PrevShadow) {
11194 // Diagnose finding a decl which is not from a base class of the
11195 // current class. We do this now because there are cases where this
11196 // function will silently decide not to build a shadow decl, which
11197 // will pre-empt further diagnostics.
11198 //
11199 // We don't need to do this in C++11 because we do the check once on
11200 // the qualifier.
11201 //
11202 // FIXME: diagnose the following if we care enough:
11203 // struct A { int foo; };
11204 // struct B : A { using A::foo; };
11205 // template <class T> struct C : A {};
11206 // template <class T> struct D : C<T> { using B::foo; } // <---
11207 // This is invalid (during instantiation) in C++03 because B::foo
11208 // resolves to the using decl in B, which is not a base class of D<T>.
11209 // We can't diagnose it immediately because C<T> is an unknown
11210 // specialization. The UsingShadowDecl in D<T> then points directly
11211 // to A::foo, which will look well-formed when we instantiate.
11212 // The right solution is to not collapse the shadow-decl chain.
11213 if (!getLangOpts().CPlusPlus11 && CurContext->isRecord()) {
11214 DeclContext *OrigDC = Orig->getDeclContext();
11215
11216 // Handle enums and anonymous structs.
11217 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent();
11218 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC);
11219 while (OrigRec->isAnonymousStructOrUnion())
11220 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext());
11221
11222 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) {
11223 if (OrigDC == CurContext) {
11224 Diag(Using->getLocation(),
11225 diag::err_using_decl_nested_name_specifier_is_current_class)
11226 << Using->getQualifierLoc().getSourceRange();
11227 Diag(Orig->getLocation(), diag::note_using_decl_target);
11228 Using->setInvalidDecl();
11229 return true;
11230 }
11231
11232 Diag(Using->getQualifierLoc().getBeginLoc(),
11233 diag::err_using_decl_nested_name_specifier_is_not_base_class)
11234 << Using->getQualifier()
11235 << cast<CXXRecordDecl>(CurContext)
11236 << Using->getQualifierLoc().getSourceRange();
11237 Diag(Orig->getLocation(), diag::note_using_decl_target);
11238 Using->setInvalidDecl();
11239 return true;
11240 }
11241 }
11242
11243 if (Previous.empty()) return false;
11244
11245 NamedDecl *Target = Orig;
11246 if (isa<UsingShadowDecl>(Target))
11247 Target = cast<UsingShadowDecl>(Target)->getTargetDecl();
11248
11249 // If the target happens to be one of the previous declarations, we
11250 // don't have a conflict.
11251 //
11252 // FIXME: but we might be increasing its access, in which case we
11253 // should redeclare it.
11254 NamedDecl *NonTag = nullptr, *Tag = nullptr;
11255 bool FoundEquivalentDecl = false;
11256 for (LookupResult::iterator I = Previous.begin(), E = Previous.end();
11257 I != E; ++I) {
11258 NamedDecl *D = (*I)->getUnderlyingDecl();
11259 // We can have UsingDecls in our Previous results because we use the same
11260 // LookupResult for checking whether the UsingDecl itself is a valid
11261 // redeclaration.
11262 if (isa<UsingDecl>(D) || isa<UsingPackDecl>(D))
11263 continue;
11264
11265 if (auto *RD = dyn_cast<CXXRecordDecl>(D)) {
11266 // C++ [class.mem]p19:
11267 // If T is the name of a class, then [every named member other than
11268 // a non-static data member] shall have a name different from T
11269 if (RD->isInjectedClassName() && !isa<FieldDecl>(Target) &&
11270 !isa<IndirectFieldDecl>(Target) &&
11271 !isa<UnresolvedUsingValueDecl>(Target) &&
11272 DiagnoseClassNameShadow(
11273 CurContext,
11274 DeclarationNameInfo(Using->getDeclName(), Using->getLocation())))
11275 return true;
11276 }
11277
11278 if (IsEquivalentForUsingDecl(Context, D, Target)) {
11279 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(*I))
11280 PrevShadow = Shadow;
11281 FoundEquivalentDecl = true;
11282 } else if (isEquivalentInternalLinkageDeclaration(D, Target)) {
11283 // We don't conflict with an existing using shadow decl of an equivalent
11284 // declaration, but we're not a redeclaration of it.
11285 FoundEquivalentDecl = true;
11286 }
11287
11288 if (isVisible(D))
11289 (isa<TagDecl>(D) ? Tag : NonTag) = D;
11290 }
11291
11292 if (FoundEquivalentDecl)
11293 return false;
11294
11295 if (FunctionDecl *FD = Target->getAsFunction()) {
11296 NamedDecl *OldDecl = nullptr;
11297 switch (CheckOverload(nullptr, FD, Previous, OldDecl,
11298 /*IsForUsingDecl*/ true)) {
11299 case Ovl_Overload:
11300 return false;
11301
11302 case Ovl_NonFunction:
11303 Diag(Using->getLocation(), diag::err_using_decl_conflict);
11304 break;
11305
11306 // We found a decl with the exact signature.
11307 case Ovl_Match:
11308 // If we're in a record, we want to hide the target, so we
11309 // return true (without a diagnostic) to tell the caller not to
11310 // build a shadow decl.
11311 if (CurContext->isRecord())
11312 return true;
11313
11314 // If we're not in a record, this is an error.
11315 Diag(Using->getLocation(), diag::err_using_decl_conflict);
11316 break;
11317 }
11318
11319 Diag(Target->getLocation(), diag::note_using_decl_target);
11320 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict);
11321 Using->setInvalidDecl();
11322 return true;
11323 }
11324
11325 // Target is not a function.
11326
11327 if (isa<TagDecl>(Target)) {
11328 // No conflict between a tag and a non-tag.
11329 if (!Tag) return false;
11330
11331 Diag(Using->getLocation(), diag::err_using_decl_conflict);
11332 Diag(Target->getLocation(), diag::note_using_decl_target);
11333 Diag(Tag->getLocation(), diag::note_using_decl_conflict);
11334 Using->setInvalidDecl();
11335 return true;
11336 }
11337
11338 // No conflict between a tag and a non-tag.
11339 if (!NonTag) return false;
11340
11341 Diag(Using->getLocation(), diag::err_using_decl_conflict);
11342 Diag(Target->getLocation(), diag::note_using_decl_target);
11343 Diag(NonTag->getLocation(), diag::note_using_decl_conflict);
11344 Using->setInvalidDecl();
11345 return true;
11346}
11347
11348/// Determine whether a direct base class is a virtual base class.
11349static bool isVirtualDirectBase(CXXRecordDecl *Derived, CXXRecordDecl *Base) {
11350 if (!Derived->getNumVBases())
11351 return false;
11352 for (auto &B : Derived->bases())
11353 if (B.getType()->getAsCXXRecordDecl() == Base)
11354 return B.isVirtual();
11355 llvm_unreachable("not a direct base class")::llvm::llvm_unreachable_internal("not a direct base class", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 11355)
;
11356}
11357
11358/// Builds a shadow declaration corresponding to a 'using' declaration.
11359UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S,
11360 UsingDecl *UD,
11361 NamedDecl *Orig,
11362 UsingShadowDecl *PrevDecl) {
11363 // If we resolved to another shadow declaration, just coalesce them.
11364 NamedDecl *Target = Orig;
11365 if (isa<UsingShadowDecl>(Target)) {
11366 Target = cast<UsingShadowDecl>(Target)->getTargetDecl();
11367 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration")((!isa<UsingShadowDecl>(Target) && "nested shadow declaration"
) ? static_cast<void> (0) : __assert_fail ("!isa<UsingShadowDecl>(Target) && \"nested shadow declaration\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 11367, __PRETTY_FUNCTION__))
;
11368 }
11369
11370 NamedDecl *NonTemplateTarget = Target;
11371 if (auto *TargetTD = dyn_cast<TemplateDecl>(Target))
11372 NonTemplateTarget = TargetTD->getTemplatedDecl();
11373
11374 UsingShadowDecl *Shadow;
11375 if (NonTemplateTarget && isa<CXXConstructorDecl>(NonTemplateTarget)) {
11376 bool IsVirtualBase =
11377 isVirtualDirectBase(cast<CXXRecordDecl>(CurContext),
11378 UD->getQualifier()->getAsRecordDecl());
11379 Shadow = ConstructorUsingShadowDecl::Create(
11380 Context, CurContext, UD->getLocation(), UD, Orig, IsVirtualBase);
11381 } else {
11382 Shadow = UsingShadowDecl::Create(Context, CurContext, UD->getLocation(), UD,
11383 Target);
11384 }
11385 UD->addShadowDecl(Shadow);
11386
11387 Shadow->setAccess(UD->getAccess());
11388 if (Orig->isInvalidDecl() || UD->isInvalidDecl())
11389 Shadow->setInvalidDecl();
11390
11391 Shadow->setPreviousDecl(PrevDecl);
11392
11393 if (S)
11394 PushOnScopeChains(Shadow, S);
11395 else
11396 CurContext->addDecl(Shadow);
11397
11398
11399 return Shadow;
11400}
11401
11402/// Hides a using shadow declaration. This is required by the current
11403/// using-decl implementation when a resolvable using declaration in a
11404/// class is followed by a declaration which would hide or override
11405/// one or more of the using decl's targets; for example:
11406///
11407/// struct Base { void foo(int); };
11408/// struct Derived : Base {
11409/// using Base::foo;
11410/// void foo(int);
11411/// };
11412///
11413/// The governing language is C++03 [namespace.udecl]p12:
11414///
11415/// When a using-declaration brings names from a base class into a
11416/// derived class scope, member functions in the derived class
11417/// override and/or hide member functions with the same name and
11418/// parameter types in a base class (rather than conflicting).
11419///
11420/// There are two ways to implement this:
11421/// (1) optimistically create shadow decls when they're not hidden
11422/// by existing declarations, or
11423/// (2) don't create any shadow decls (or at least don't make them
11424/// visible) until we've fully parsed/instantiated the class.
11425/// The problem with (1) is that we might have to retroactively remove
11426/// a shadow decl, which requires several O(n) operations because the
11427/// decl structures are (very reasonably) not designed for removal.
11428/// (2) avoids this but is very fiddly and phase-dependent.
11429void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) {
11430 if (Shadow->getDeclName().getNameKind() ==
11431 DeclarationName::CXXConversionFunctionName)
11432 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow);
11433
11434 // Remove it from the DeclContext...
11435 Shadow->getDeclContext()->removeDecl(Shadow);
11436
11437 // ...and the scope, if applicable...
11438 if (S) {
11439 S->RemoveDecl(Shadow);
11440 IdResolver.RemoveDecl(Shadow);
11441 }
11442
11443 // ...and the using decl.
11444 Shadow->getUsingDecl()->removeShadowDecl(Shadow);
11445
11446 // TODO: complain somehow if Shadow was used. It shouldn't
11447 // be possible for this to happen, because...?
11448}
11449
11450/// Find the base specifier for a base class with the given type.
11451static CXXBaseSpecifier *findDirectBaseWithType(CXXRecordDecl *Derived,
11452 QualType DesiredBase,
11453 bool &AnyDependentBases) {
11454 // Check whether the named type is a direct base class.
11455 CanQualType CanonicalDesiredBase = DesiredBase->getCanonicalTypeUnqualified()
11456 .getUnqualifiedType();
11457 for (auto &Base : Derived->bases()) {
11458 CanQualType BaseType = Base.getType()->getCanonicalTypeUnqualified();
11459 if (CanonicalDesiredBase == BaseType)
11460 return &Base;
11461 if (BaseType->isDependentType())
11462 AnyDependentBases = true;
11463 }
11464 return nullptr;
11465}
11466
11467namespace {
11468class UsingValidatorCCC final : public CorrectionCandidateCallback {
11469public:
11470 UsingValidatorCCC(bool HasTypenameKeyword, bool IsInstantiation,
11471 NestedNameSpecifier *NNS, CXXRecordDecl *RequireMemberOf)
11472 : HasTypenameKeyword(HasTypenameKeyword),
11473 IsInstantiation(IsInstantiation), OldNNS(NNS),
11474 RequireMemberOf(RequireMemberOf) {}
11475
11476 bool ValidateCandidate(const TypoCorrection &Candidate) override {
11477 NamedDecl *ND = Candidate.getCorrectionDecl();
11478
11479 // Keywords are not valid here.
11480 if (!ND || isa<NamespaceDecl>(ND))
11481 return false;
11482
11483 // Completely unqualified names are invalid for a 'using' declaration.
11484 if (Candidate.WillReplaceSpecifier() && !Candidate.getCorrectionSpecifier())
11485 return false;
11486
11487 // FIXME: Don't correct to a name that CheckUsingDeclRedeclaration would
11488 // reject.
11489
11490 if (RequireMemberOf) {
11491 auto *FoundRecord = dyn_cast<CXXRecordDecl>(ND);
11492 if (FoundRecord && FoundRecord->isInjectedClassName()) {
11493 // No-one ever wants a using-declaration to name an injected-class-name
11494 // of a base class, unless they're declaring an inheriting constructor.
11495 ASTContext &Ctx = ND->getASTContext();
11496 if (!Ctx.getLangOpts().CPlusPlus11)
11497 return false;
11498 QualType FoundType = Ctx.getRecordType(FoundRecord);
11499
11500 // Check that the injected-class-name is named as a member of its own
11501 // type; we don't want to suggest 'using Derived::Base;', since that
11502 // means something else.
11503 NestedNameSpecifier *Specifier =
11504 Candidate.WillReplaceSpecifier()
11505 ? Candidate.getCorrectionSpecifier()
11506 : OldNNS;
11507 if (!Specifier->getAsType() ||
11508 !Ctx.hasSameType(QualType(Specifier->getAsType(), 0), FoundType))
11509 return false;
11510
11511 // Check that this inheriting constructor declaration actually names a
11512 // direct base class of the current class.
11513 bool AnyDependentBases = false;
11514 if (!findDirectBaseWithType(RequireMemberOf,
11515 Ctx.getRecordType(FoundRecord),
11516 AnyDependentBases) &&
11517 !AnyDependentBases)
11518 return false;
11519 } else {
11520 auto *RD = dyn_cast<CXXRecordDecl>(ND->getDeclContext());
11521 if (!RD || RequireMemberOf->isProvablyNotDerivedFrom(RD))
11522 return false;
11523
11524 // FIXME: Check that the base class member is accessible?
11525 }
11526 } else {
11527 auto *FoundRecord = dyn_cast<CXXRecordDecl>(ND);
11528 if (FoundRecord && FoundRecord->isInjectedClassName())
11529 return false;
11530 }
11531
11532 if (isa<TypeDecl>(ND))
11533 return HasTypenameKeyword || !IsInstantiation;
11534
11535 return !HasTypenameKeyword;
11536 }
11537
11538 std::unique_ptr<CorrectionCandidateCallback> clone() override {
11539 return std::make_unique<UsingValidatorCCC>(*this);
11540 }
11541
11542private:
11543 bool HasTypenameKeyword;
11544 bool IsInstantiation;
11545 NestedNameSpecifier *OldNNS;
11546 CXXRecordDecl *RequireMemberOf;
11547};
11548} // end anonymous namespace
11549
11550/// Builds a using declaration.
11551///
11552/// \param IsInstantiation - Whether this call arises from an
11553/// instantiation of an unresolved using declaration. We treat
11554/// the lookup differently for these declarations.
11555NamedDecl *Sema::BuildUsingDeclaration(
11556 Scope *S, AccessSpecifier AS, SourceLocation UsingLoc,
11557 bool HasTypenameKeyword, SourceLocation TypenameLoc, CXXScopeSpec &SS,
11558 DeclarationNameInfo NameInfo, SourceLocation EllipsisLoc,
11559 const ParsedAttributesView &AttrList, bool IsInstantiation) {
11560 assert(!SS.isInvalid() && "Invalid CXXScopeSpec.")((!SS.isInvalid() && "Invalid CXXScopeSpec.") ? static_cast
<void> (0) : __assert_fail ("!SS.isInvalid() && \"Invalid CXXScopeSpec.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 11560, __PRETTY_FUNCTION__))
;
11561 SourceLocation IdentLoc = NameInfo.getLoc();
11562 assert(IdentLoc.isValid() && "Invalid TargetName location.")((IdentLoc.isValid() && "Invalid TargetName location."
) ? static_cast<void> (0) : __assert_fail ("IdentLoc.isValid() && \"Invalid TargetName location.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 11562, __PRETTY_FUNCTION__))
;
11563
11564 // FIXME: We ignore attributes for now.
11565
11566 // For an inheriting constructor declaration, the name of the using
11567 // declaration is the name of a constructor in this class, not in the
11568 // base class.
11569 DeclarationNameInfo UsingName = NameInfo;
11570 if (UsingName.getName().getNameKind() == DeclarationName::CXXConstructorName)
11571 if (auto *RD = dyn_cast<CXXRecordDecl>(CurContext))
11572 UsingName.setName(Context.DeclarationNames.getCXXConstructorName(
11573 Context.getCanonicalType(Context.getRecordType(RD))));
11574
11575 // Do the redeclaration lookup in the current scope.
11576 LookupResult Previous(*this, UsingName, LookupUsingDeclName,
11577 ForVisibleRedeclaration);
11578 Previous.setHideTags(false);
11579 if (S) {
11580 LookupName(Previous, S);
11581
11582 // It is really dumb that we have to do this.
11583 LookupResult::Filter F = Previous.makeFilter();
11584 while (F.hasNext()) {
11585 NamedDecl *D = F.next();
11586 if (!isDeclInScope(D, CurContext, S))
11587 F.erase();
11588 // If we found a local extern declaration that's not ordinarily visible,
11589 // and this declaration is being added to a non-block scope, ignore it.
11590 // We're only checking for scope conflicts here, not also for violations
11591 // of the linkage rules.
11592 else if (!CurContext->isFunctionOrMethod() && D->isLocalExternDecl() &&
11593 !(D->getIdentifierNamespace() & Decl::IDNS_Ordinary))
11594 F.erase();
11595 }
11596 F.done();
11597 } else {
11598 assert(IsInstantiation && "no scope in non-instantiation")((IsInstantiation && "no scope in non-instantiation")
? static_cast<void> (0) : __assert_fail ("IsInstantiation && \"no scope in non-instantiation\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 11598, __PRETTY_FUNCTION__))
;
11599 if (CurContext->isRecord())
11600 LookupQualifiedName(Previous, CurContext);
11601 else {
11602 // No redeclaration check is needed here; in non-member contexts we
11603 // diagnosed all possible conflicts with other using-declarations when
11604 // building the template:
11605 //
11606 // For a dependent non-type using declaration, the only valid case is
11607 // if we instantiate to a single enumerator. We check for conflicts
11608 // between shadow declarations we introduce, and we check in the template
11609 // definition for conflicts between a non-type using declaration and any
11610 // other declaration, which together covers all cases.
11611 //
11612 // A dependent typename using declaration will never successfully
11613 // instantiate, since it will always name a class member, so we reject
11614 // that in the template definition.
11615 }
11616 }
11617
11618 // Check for invalid redeclarations.
11619 if (CheckUsingDeclRedeclaration(UsingLoc, HasTypenameKeyword,
11620 SS, IdentLoc, Previous))
11621 return nullptr;
11622
11623 // Check for bad qualifiers.
11624 if (CheckUsingDeclQualifier(UsingLoc, HasTypenameKeyword, SS, NameInfo,
11625 IdentLoc))
11626 return nullptr;
11627
11628 DeclContext *LookupContext = computeDeclContext(SS);
11629 NamedDecl *D;
11630 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
11631 if (!LookupContext || EllipsisLoc.isValid()) {
11632 if (HasTypenameKeyword) {
11633 // FIXME: not all declaration name kinds are legal here
11634 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext,
11635 UsingLoc, TypenameLoc,
11636 QualifierLoc,
11637 IdentLoc, NameInfo.getName(),
11638 EllipsisLoc);
11639 } else {
11640 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc,
11641 QualifierLoc, NameInfo, EllipsisLoc);
11642 }
11643 D->setAccess(AS);
11644 CurContext->addDecl(D);
11645 return D;
11646 }
11647
11648 auto Build = [&](bool Invalid) {
11649 UsingDecl *UD =
11650 UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc,
11651 UsingName, HasTypenameKeyword);
11652 UD->setAccess(AS);
11653 CurContext->addDecl(UD);
11654 UD->setInvalidDecl(Invalid);
11655 return UD;
11656 };
11657 auto BuildInvalid = [&]{ return Build(true); };
11658 auto BuildValid = [&]{ return Build(false); };
11659
11660 if (RequireCompleteDeclContext(SS, LookupContext))
11661 return BuildInvalid();
11662
11663 // Look up the target name.
11664 LookupResult R(*this, NameInfo, LookupOrdinaryName);
11665
11666 // Unlike most lookups, we don't always want to hide tag
11667 // declarations: tag names are visible through the using declaration
11668 // even if hidden by ordinary names, *except* in a dependent context
11669 // where it's important for the sanity of two-phase lookup.
11670 if (!IsInstantiation)
11671 R.setHideTags(false);
11672
11673 // For the purposes of this lookup, we have a base object type
11674 // equal to that of the current context.
11675 if (CurContext->isRecord()) {
11676 R.setBaseObjectType(
11677 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext)));
11678 }
11679
11680 LookupQualifiedName(R, LookupContext);
11681
11682 // Try to correct typos if possible. If constructor name lookup finds no
11683 // results, that means the named class has no explicit constructors, and we
11684 // suppressed declaring implicit ones (probably because it's dependent or
11685 // invalid).
11686 if (R.empty() &&
11687 NameInfo.getName().getNameKind() != DeclarationName::CXXConstructorName) {
11688 // HACK: Work around a bug in libstdc++'s detection of ::gets. Sometimes
11689 // it will believe that glibc provides a ::gets in cases where it does not,
11690 // and will try to pull it into namespace std with a using-declaration.
11691 // Just ignore the using-declaration in that case.
11692 auto *II = NameInfo.getName().getAsIdentifierInfo();
11693 if (getLangOpts().CPlusPlus14 && II && II->isStr("gets") &&
11694 CurContext->isStdNamespace() &&
11695 isa<TranslationUnitDecl>(LookupContext) &&
11696 getSourceManager().isInSystemHeader(UsingLoc))
11697 return nullptr;
11698 UsingValidatorCCC CCC(HasTypenameKeyword, IsInstantiation, SS.getScopeRep(),
11699 dyn_cast<CXXRecordDecl>(CurContext));
11700 if (TypoCorrection Corrected =
11701 CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, CCC,
11702 CTK_ErrorRecovery)) {
11703 // We reject candidates where DroppedSpecifier == true, hence the
11704 // literal '0' below.
11705 diagnoseTypo(Corrected, PDiag(diag::err_no_member_suggest)
11706 << NameInfo.getName() << LookupContext << 0
11707 << SS.getRange());
11708
11709 // If we picked a correction with no attached Decl we can't do anything
11710 // useful with it, bail out.
11711 NamedDecl *ND = Corrected.getCorrectionDecl();
11712 if (!ND)
11713 return BuildInvalid();
11714
11715 // If we corrected to an inheriting constructor, handle it as one.
11716 auto *RD = dyn_cast<CXXRecordDecl>(ND);
11717 if (RD && RD->isInjectedClassName()) {
11718 // The parent of the injected class name is the class itself.
11719 RD = cast<CXXRecordDecl>(RD->getParent());
11720
11721 // Fix up the information we'll use to build the using declaration.
11722 if (Corrected.WillReplaceSpecifier()) {
11723 NestedNameSpecifierLocBuilder Builder;
11724 Builder.MakeTrivial(Context, Corrected.getCorrectionSpecifier(),
11725 QualifierLoc.getSourceRange());
11726 QualifierLoc = Builder.getWithLocInContext(Context);
11727 }
11728
11729 // In this case, the name we introduce is the name of a derived class
11730 // constructor.
11731 auto *CurClass = cast<CXXRecordDecl>(CurContext);
11732 UsingName.setName(Context.DeclarationNames.getCXXConstructorName(
11733 Context.getCanonicalType(Context.getRecordType(CurClass))));
11734 UsingName.setNamedTypeInfo(nullptr);
11735 for (auto *Ctor : LookupConstructors(RD))
11736 R.addDecl(Ctor);
11737 R.resolveKind();
11738 } else {
11739 // FIXME: Pick up all the declarations if we found an overloaded
11740 // function.
11741 UsingName.setName(ND->getDeclName());
11742 R.addDecl(ND);
11743 }
11744 } else {
11745 Diag(IdentLoc, diag::err_no_member)
11746 << NameInfo.getName() << LookupContext << SS.getRange();
11747 return BuildInvalid();
11748 }
11749 }
11750
11751 if (R.isAmbiguous())
11752 return BuildInvalid();
11753
11754 if (HasTypenameKeyword) {
11755 // If we asked for a typename and got a non-type decl, error out.
11756 if (!R.getAsSingle<TypeDecl>()) {
11757 Diag(IdentLoc, diag::err_using_typename_non_type);
11758 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I)
11759 Diag((*I)->getUnderlyingDecl()->getLocation(),
11760 diag::note_using_decl_target);
11761 return BuildInvalid();
11762 }
11763 } else {
11764 // If we asked for a non-typename and we got a type, error out,
11765 // but only if this is an instantiation of an unresolved using
11766 // decl. Otherwise just silently find the type name.
11767 if (IsInstantiation && R.getAsSingle<TypeDecl>()) {
11768 Diag(IdentLoc, diag::err_using_dependent_value_is_type);
11769 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target);
11770 return BuildInvalid();
11771 }
11772 }
11773
11774 // C++14 [namespace.udecl]p6:
11775 // A using-declaration shall not name a namespace.
11776 if (R.getAsSingle<NamespaceDecl>()) {
11777 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace)
11778 << SS.getRange();
11779 return BuildInvalid();
11780 }
11781
11782 // C++14 [namespace.udecl]p7:
11783 // A using-declaration shall not name a scoped enumerator.
11784 if (auto *ED = R.getAsSingle<EnumConstantDecl>()) {
11785 if (cast<EnumDecl>(ED->getDeclContext())->isScoped()) {
11786 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_scoped_enum)
11787 << SS.getRange();
11788 return BuildInvalid();
11789 }
11790 }
11791
11792 UsingDecl *UD = BuildValid();
11793
11794 // Some additional rules apply to inheriting constructors.
11795 if (UsingName.getName().getNameKind() ==
11796 DeclarationName::CXXConstructorName) {
11797 // Suppress access diagnostics; the access check is instead performed at the
11798 // point of use for an inheriting constructor.
11799 R.suppressDiagnostics();
11800 if (CheckInheritingConstructorUsingDecl(UD))
11801 return UD;
11802 }
11803
11804 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
11805 UsingShadowDecl *PrevDecl = nullptr;
11806 if (!CheckUsingShadowDecl(UD, *I, Previous, PrevDecl))
11807 BuildUsingShadowDecl(S, UD, *I, PrevDecl);
11808 }
11809
11810 return UD;
11811}
11812
11813NamedDecl *Sema::BuildUsingPackDecl(NamedDecl *InstantiatedFrom,
11814 ArrayRef<NamedDecl *> Expansions) {
11815 assert(isa<UnresolvedUsingValueDecl>(InstantiatedFrom) ||((isa<UnresolvedUsingValueDecl>(InstantiatedFrom) || isa
<UnresolvedUsingTypenameDecl>(InstantiatedFrom) || isa<
UsingPackDecl>(InstantiatedFrom)) ? static_cast<void>
(0) : __assert_fail ("isa<UnresolvedUsingValueDecl>(InstantiatedFrom) || isa<UnresolvedUsingTypenameDecl>(InstantiatedFrom) || isa<UsingPackDecl>(InstantiatedFrom)"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 11817, __PRETTY_FUNCTION__))
11816 isa<UnresolvedUsingTypenameDecl>(InstantiatedFrom) ||((isa<UnresolvedUsingValueDecl>(InstantiatedFrom) || isa
<UnresolvedUsingTypenameDecl>(InstantiatedFrom) || isa<
UsingPackDecl>(InstantiatedFrom)) ? static_cast<void>
(0) : __assert_fail ("isa<UnresolvedUsingValueDecl>(InstantiatedFrom) || isa<UnresolvedUsingTypenameDecl>(InstantiatedFrom) || isa<UsingPackDecl>(InstantiatedFrom)"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 11817, __PRETTY_FUNCTION__))
11817 isa<UsingPackDecl>(InstantiatedFrom))((isa<UnresolvedUsingValueDecl>(InstantiatedFrom) || isa
<UnresolvedUsingTypenameDecl>(InstantiatedFrom) || isa<
UsingPackDecl>(InstantiatedFrom)) ? static_cast<void>
(0) : __assert_fail ("isa<UnresolvedUsingValueDecl>(InstantiatedFrom) || isa<UnresolvedUsingTypenameDecl>(InstantiatedFrom) || isa<UsingPackDecl>(InstantiatedFrom)"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 11817, __PRETTY_FUNCTION__))
;
11818
11819 auto *UPD =
11820 UsingPackDecl::Create(Context, CurContext, InstantiatedFrom, Expansions);
11821 UPD->setAccess(InstantiatedFrom->getAccess());
11822 CurContext->addDecl(UPD);
11823 return UPD;
11824}
11825
11826/// Additional checks for a using declaration referring to a constructor name.
11827bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) {
11828 assert(!UD->hasTypename() && "expecting a constructor name")((!UD->hasTypename() && "expecting a constructor name"
) ? static_cast<void> (0) : __assert_fail ("!UD->hasTypename() && \"expecting a constructor name\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 11828, __PRETTY_FUNCTION__))
;
11829
11830 const Type *SourceType = UD->getQualifier()->getAsType();
11831 assert(SourceType &&((SourceType && "Using decl naming constructor doesn't have type in scope spec."
) ? static_cast<void> (0) : __assert_fail ("SourceType && \"Using decl naming constructor doesn't have type in scope spec.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 11832, __PRETTY_FUNCTION__))
11832 "Using decl naming constructor doesn't have type in scope spec.")((SourceType && "Using decl naming constructor doesn't have type in scope spec."
) ? static_cast<void> (0) : __assert_fail ("SourceType && \"Using decl naming constructor doesn't have type in scope spec.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 11832, __PRETTY_FUNCTION__))
;
11833 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext);
11834
11835 // Check whether the named type is a direct base class.
11836 bool AnyDependentBases = false;
11837 auto *Base = findDirectBaseWithType(TargetClass, QualType(SourceType, 0),
11838 AnyDependentBases);
11839 if (!Base && !AnyDependentBases) {
11840 Diag(UD->getUsingLoc(),
11841 diag::err_using_decl_constructor_not_in_direct_base)
11842 << UD->getNameInfo().getSourceRange()
11843 << QualType(SourceType, 0) << TargetClass;
11844 UD->setInvalidDecl();
11845 return true;
11846 }
11847
11848 if (Base)
11849 Base->setInheritConstructors();
11850
11851 return false;
11852}
11853
11854/// Checks that the given using declaration is not an invalid
11855/// redeclaration. Note that this is checking only for the using decl
11856/// itself, not for any ill-formedness among the UsingShadowDecls.
11857bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc,
11858 bool HasTypenameKeyword,
11859 const CXXScopeSpec &SS,
11860 SourceLocation NameLoc,
11861 const LookupResult &Prev) {
11862 NestedNameSpecifier *Qual = SS.getScopeRep();
11863
11864 // C++03 [namespace.udecl]p8:
11865 // C++0x [namespace.udecl]p10:
11866 // A using-declaration is a declaration and can therefore be used
11867 // repeatedly where (and only where) multiple declarations are
11868 // allowed.
11869 //
11870 // That's in non-member contexts.
11871 if (!CurContext->getRedeclContext()->isRecord()) {
11872 // A dependent qualifier outside a class can only ever resolve to an
11873 // enumeration type. Therefore it conflicts with any other non-type
11874 // declaration in the same scope.
11875 // FIXME: How should we check for dependent type-type conflicts at block
11876 // scope?
11877 if (Qual->isDependent() && !HasTypenameKeyword) {
11878 for (auto *D : Prev) {
11879 if (!isa<TypeDecl>(D) && !isa<UsingDecl>(D) && !isa<UsingPackDecl>(D)) {
11880 bool OldCouldBeEnumerator =
11881 isa<UnresolvedUsingValueDecl>(D) || isa<EnumConstantDecl>(D);
11882 Diag(NameLoc,
11883 OldCouldBeEnumerator ? diag::err_redefinition
11884 : diag::err_redefinition_different_kind)
11885 << Prev.getLookupName();
11886 Diag(D->getLocation(), diag::note_previous_definition);
11887 return true;
11888 }
11889 }
11890 }
11891 return false;
11892 }
11893
11894 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) {
11895 NamedDecl *D = *I;
11896
11897 bool DTypename;
11898 NestedNameSpecifier *DQual;
11899 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) {
11900 DTypename = UD->hasTypename();
11901 DQual = UD->getQualifier();
11902 } else if (UnresolvedUsingValueDecl *UD
11903 = dyn_cast<UnresolvedUsingValueDecl>(D)) {
11904 DTypename = false;
11905 DQual = UD->getQualifier();
11906 } else if (UnresolvedUsingTypenameDecl *UD
11907 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) {
11908 DTypename = true;
11909 DQual = UD->getQualifier();
11910 } else continue;
11911
11912 // using decls differ if one says 'typename' and the other doesn't.
11913 // FIXME: non-dependent using decls?
11914 if (HasTypenameKeyword != DTypename) continue;
11915
11916 // using decls differ if they name different scopes (but note that
11917 // template instantiation can cause this check to trigger when it
11918 // didn't before instantiation).
11919 if (Context.getCanonicalNestedNameSpecifier(Qual) !=
11920 Context.getCanonicalNestedNameSpecifier(DQual))
11921 continue;
11922
11923 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange();
11924 Diag(D->getLocation(), diag::note_using_decl) << 1;
11925 return true;
11926 }
11927
11928 return false;
11929}
11930
11931
11932/// Checks that the given nested-name qualifier used in a using decl
11933/// in the current context is appropriately related to the current
11934/// scope. If an error is found, diagnoses it and returns true.
11935bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc,
11936 bool HasTypename,
11937 const CXXScopeSpec &SS,
11938 const DeclarationNameInfo &NameInfo,
11939 SourceLocation NameLoc) {
11940 DeclContext *NamedContext = computeDeclContext(SS);
11941
11942 if (!CurContext->isRecord()) {
11943 // C++03 [namespace.udecl]p3:
11944 // C++0x [namespace.udecl]p8:
11945 // A using-declaration for a class member shall be a member-declaration.
11946
11947 // If we weren't able to compute a valid scope, it might validly be a
11948 // dependent class scope or a dependent enumeration unscoped scope. If
11949 // we have a 'typename' keyword, the scope must resolve to a class type.
11950 if ((HasTypename && !NamedContext) ||
11951 (NamedContext && NamedContext->getRedeclContext()->isRecord())) {
11952 auto *RD = NamedContext
11953 ? cast<CXXRecordDecl>(NamedContext->getRedeclContext())
11954 : nullptr;
11955 if (RD && RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), RD))
11956 RD = nullptr;
11957
11958 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member)
11959 << SS.getRange();
11960
11961 // If we have a complete, non-dependent source type, try to suggest a
11962 // way to get the same effect.
11963 if (!RD)
11964 return true;
11965
11966 // Find what this using-declaration was referring to.
11967 LookupResult R(*this, NameInfo, LookupOrdinaryName);
11968 R.setHideTags(false);
11969 R.suppressDiagnostics();
11970 LookupQualifiedName(R, RD);
11971
11972 if (R.getAsSingle<TypeDecl>()) {
11973 if (getLangOpts().CPlusPlus11) {
11974 // Convert 'using X::Y;' to 'using Y = X::Y;'.
11975 Diag(SS.getBeginLoc(), diag::note_using_decl_class_member_workaround)
11976 << 0 // alias declaration
11977 << FixItHint::CreateInsertion(SS.getBeginLoc(),
11978 NameInfo.getName().getAsString() +
11979 " = ");
11980 } else {
11981 // Convert 'using X::Y;' to 'typedef X::Y Y;'.
11982 SourceLocation InsertLoc = getLocForEndOfToken(NameInfo.getEndLoc());
11983 Diag(InsertLoc, diag::note_using_decl_class_member_workaround)
11984 << 1 // typedef declaration
11985 << FixItHint::CreateReplacement(UsingLoc, "typedef")
11986 << FixItHint::CreateInsertion(
11987 InsertLoc, " " + NameInfo.getName().getAsString());
11988 }
11989 } else if (R.getAsSingle<VarDecl>()) {
11990 // Don't provide a fixit outside C++11 mode; we don't want to suggest
11991 // repeating the type of the static data member here.
11992 FixItHint FixIt;
11993 if (getLangOpts().CPlusPlus11) {
11994 // Convert 'using X::Y;' to 'auto &Y = X::Y;'.
11995 FixIt = FixItHint::CreateReplacement(
11996 UsingLoc, "auto &" + NameInfo.getName().getAsString() + " = ");
11997 }
11998
11999 Diag(UsingLoc, diag::note_using_decl_class_member_workaround)
12000 << 2 // reference declaration
12001 << FixIt;
12002 } else if (R.getAsSingle<EnumConstantDecl>()) {
12003 // Don't provide a fixit outside C++11 mode; we don't want to suggest
12004 // repeating the type of the enumeration here, and we can't do so if
12005 // the type is anonymous.
12006 FixItHint FixIt;
12007 if (getLangOpts().CPlusPlus11) {
12008 // Convert 'using X::Y;' to 'auto &Y = X::Y;'.
12009 FixIt = FixItHint::CreateReplacement(
12010 UsingLoc,
12011 "constexpr auto " + NameInfo.getName().getAsString() + " = ");
12012 }
12013
12014 Diag(UsingLoc, diag::note_using_decl_class_member_workaround)
12015 << (getLangOpts().CPlusPlus11 ? 4 : 3) // const[expr] variable
12016 << FixIt;
12017 }
12018 return true;
12019 }
12020
12021 // Otherwise, this might be valid.
12022 return false;
12023 }
12024
12025 // The current scope is a record.
12026
12027 // If the named context is dependent, we can't decide much.
12028 if (!NamedContext) {
12029 // FIXME: in C++0x, we can diagnose if we can prove that the
12030 // nested-name-specifier does not refer to a base class, which is
12031 // still possible in some cases.
12032
12033 // Otherwise we have to conservatively report that things might be
12034 // okay.
12035 return false;
12036 }
12037
12038 if (!NamedContext->isRecord()) {
12039 // Ideally this would point at the last name in the specifier,
12040 // but we don't have that level of source info.
12041 Diag(SS.getRange().getBegin(),
12042 diag::err_using_decl_nested_name_specifier_is_not_class)
12043 << SS.getScopeRep() << SS.getRange();
12044 return true;
12045 }
12046
12047 if (!NamedContext->isDependentContext() &&
12048 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext))
12049 return true;
12050
12051 if (getLangOpts().CPlusPlus11) {
12052 // C++11 [namespace.udecl]p3:
12053 // In a using-declaration used as a member-declaration, the
12054 // nested-name-specifier shall name a base class of the class
12055 // being defined.
12056
12057 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(
12058 cast<CXXRecordDecl>(NamedContext))) {
12059 if (CurContext == NamedContext) {
12060 Diag(NameLoc,
12061 diag::err_using_decl_nested_name_specifier_is_current_class)
12062 << SS.getRange();
12063 return true;
12064 }
12065
12066 if (!cast<CXXRecordDecl>(NamedContext)->isInvalidDecl()) {
12067 Diag(SS.getRange().getBegin(),
12068 diag::err_using_decl_nested_name_specifier_is_not_base_class)
12069 << SS.getScopeRep()
12070 << cast<CXXRecordDecl>(CurContext)
12071 << SS.getRange();
12072 }
12073 return true;
12074 }
12075
12076 return false;
12077 }
12078
12079 // C++03 [namespace.udecl]p4:
12080 // A using-declaration used as a member-declaration shall refer
12081 // to a member of a base class of the class being defined [etc.].
12082
12083 // Salient point: SS doesn't have to name a base class as long as
12084 // lookup only finds members from base classes. Therefore we can
12085 // diagnose here only if we can prove that that can't happen,
12086 // i.e. if the class hierarchies provably don't intersect.
12087
12088 // TODO: it would be nice if "definitely valid" results were cached
12089 // in the UsingDecl and UsingShadowDecl so that these checks didn't
12090 // need to be repeated.
12091
12092 llvm::SmallPtrSet<const CXXRecordDecl *, 4> Bases;
12093 auto Collect = [&Bases](const CXXRecordDecl *Base) {
12094 Bases.insert(Base);
12095 return true;
12096 };
12097
12098 // Collect all bases. Return false if we find a dependent base.
12099 if (!cast<CXXRecordDecl>(CurContext)->forallBases(Collect))
12100 return false;
12101
12102 // Returns true if the base is dependent or is one of the accumulated base
12103 // classes.
12104 auto IsNotBase = [&Bases](const CXXRecordDecl *Base) {
12105 return !Bases.count(Base);
12106 };
12107
12108 // Return false if the class has a dependent base or if it or one
12109 // of its bases is present in the base set of the current context.
12110 if (Bases.count(cast<CXXRecordDecl>(NamedContext)) ||
12111 !cast<CXXRecordDecl>(NamedContext)->forallBases(IsNotBase))
12112 return false;
12113
12114 Diag(SS.getRange().getBegin(),
12115 diag::err_using_decl_nested_name_specifier_is_not_base_class)
12116 << SS.getScopeRep()
12117 << cast<CXXRecordDecl>(CurContext)
12118 << SS.getRange();
12119
12120 return true;
12121}
12122
12123Decl *Sema::ActOnAliasDeclaration(Scope *S, AccessSpecifier AS,
12124 MultiTemplateParamsArg TemplateParamLists,
12125 SourceLocation UsingLoc, UnqualifiedId &Name,
12126 const ParsedAttributesView &AttrList,
12127 TypeResult Type, Decl *DeclFromDeclSpec) {
12128 // Skip up to the relevant declaration scope.
12129 while (S->isTemplateParamScope())
12130 S = S->getParent();
12131 assert((S->getFlags() & Scope::DeclScope) &&(((S->getFlags() & Scope::DeclScope) && "got alias-declaration outside of declaration scope"
) ? static_cast<void> (0) : __assert_fail ("(S->getFlags() & Scope::DeclScope) && \"got alias-declaration outside of declaration scope\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 12132, __PRETTY_FUNCTION__))
12132 "got alias-declaration outside of declaration scope")(((S->getFlags() & Scope::DeclScope) && "got alias-declaration outside of declaration scope"
) ? static_cast<void> (0) : __assert_fail ("(S->getFlags() & Scope::DeclScope) && \"got alias-declaration outside of declaration scope\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 12132, __PRETTY_FUNCTION__))
;
12133
12134 if (Type.isInvalid())
12135 return nullptr;
12136
12137 bool Invalid = false;
12138 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name);
12139 TypeSourceInfo *TInfo = nullptr;
12140 GetTypeFromParser(Type.get(), &TInfo);
12141
12142 if (DiagnoseClassNameShadow(CurContext, NameInfo))
12143 return nullptr;
12144
12145 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo,
12146 UPPC_DeclarationType)) {
12147 Invalid = true;
12148 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy,
12149 TInfo->getTypeLoc().getBeginLoc());
12150 }
12151
12152 LookupResult Previous(*this, NameInfo, LookupOrdinaryName,
12153 TemplateParamLists.size()
12154 ? forRedeclarationInCurContext()
12155 : ForVisibleRedeclaration);
12156 LookupName(Previous, S);
12157
12158 // Warn about shadowing the name of a template parameter.
12159 if (Previous.isSingleResult() &&
12160 Previous.getFoundDecl()->isTemplateParameter()) {
12161 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl());
12162 Previous.clear();
12163 }
12164
12165 assert(Name.Kind == UnqualifiedIdKind::IK_Identifier &&((Name.Kind == UnqualifiedIdKind::IK_Identifier && "name in alias declaration must be an identifier"
) ? static_cast<void> (0) : __assert_fail ("Name.Kind == UnqualifiedIdKind::IK_Identifier && \"name in alias declaration must be an identifier\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 12166, __PRETTY_FUNCTION__))
12166 "name in alias declaration must be an identifier")((Name.Kind == UnqualifiedIdKind::IK_Identifier && "name in alias declaration must be an identifier"
) ? static_cast<void> (0) : __assert_fail ("Name.Kind == UnqualifiedIdKind::IK_Identifier && \"name in alias declaration must be an identifier\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 12166, __PRETTY_FUNCTION__))
;
12167 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc,
12168 Name.StartLocation,
12169 Name.Identifier, TInfo);
12170
12171 NewTD->setAccess(AS);
12172
12173 if (Invalid)
12174 NewTD->setInvalidDecl();
12175
12176 ProcessDeclAttributeList(S, NewTD, AttrList);
12177 AddPragmaAttributes(S, NewTD);
12178
12179 CheckTypedefForVariablyModifiedType(S, NewTD);
12180 Invalid |= NewTD->isInvalidDecl();
12181
12182 bool Redeclaration = false;
12183
12184 NamedDecl *NewND;
12185 if (TemplateParamLists.size()) {
12186 TypeAliasTemplateDecl *OldDecl = nullptr;
12187 TemplateParameterList *OldTemplateParams = nullptr;
12188
12189 if (TemplateParamLists.size() != 1) {
12190 Diag(UsingLoc, diag::err_alias_template_extra_headers)
12191 << SourceRange(TemplateParamLists[1]->getTemplateLoc(),
12192 TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc());
12193 }
12194 TemplateParameterList *TemplateParams = TemplateParamLists[0];
12195
12196 // Check that we can declare a template here.
12197 if (CheckTemplateDeclScope(S, TemplateParams))
12198 return nullptr;
12199
12200 // Only consider previous declarations in the same scope.
12201 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false,
12202 /*ExplicitInstantiationOrSpecialization*/false);
12203 if (!Previous.empty()) {
12204 Redeclaration = true;
12205
12206 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>();
12207 if (!OldDecl && !Invalid) {
12208 Diag(UsingLoc, diag::err_redefinition_different_kind)
12209 << Name.Identifier;
12210
12211 NamedDecl *OldD = Previous.getRepresentativeDecl();
12212 if (OldD->getLocation().isValid())
12213 Diag(OldD->getLocation(), diag::note_previous_definition);
12214
12215 Invalid = true;
12216 }
12217
12218 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) {
12219 if (TemplateParameterListsAreEqual(TemplateParams,
12220 OldDecl->getTemplateParameters(),
12221 /*Complain=*/true,
12222 TPL_TemplateMatch))
12223 OldTemplateParams =
12224 OldDecl->getMostRecentDecl()->getTemplateParameters();
12225 else
12226 Invalid = true;
12227
12228 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl();
12229 if (!Invalid &&
12230 !Context.hasSameType(OldTD->getUnderlyingType(),
12231 NewTD->getUnderlyingType())) {
12232 // FIXME: The C++0x standard does not clearly say this is ill-formed,
12233 // but we can't reasonably accept it.
12234 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef)
12235 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType();
12236 if (OldTD->getLocation().isValid())
12237 Diag(OldTD->getLocation(), diag::note_previous_definition);
12238 Invalid = true;
12239 }
12240 }
12241 }
12242
12243 // Merge any previous default template arguments into our parameters,
12244 // and check the parameter list.
12245 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams,
12246 TPC_TypeAliasTemplate))
12247 return nullptr;
12248
12249 TypeAliasTemplateDecl *NewDecl =
12250 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc,
12251 Name.Identifier, TemplateParams,
12252 NewTD);
12253 NewTD->setDescribedAliasTemplate(NewDecl);
12254
12255 NewDecl->setAccess(AS);
12256
12257 if (Invalid)
12258 NewDecl->setInvalidDecl();
12259 else if (OldDecl) {
12260 NewDecl->setPreviousDecl(OldDecl);
12261 CheckRedeclarationModuleOwnership(NewDecl, OldDecl);
12262 }
12263
12264 NewND = NewDecl;
12265 } else {
12266 if (auto *TD = dyn_cast_or_null<TagDecl>(DeclFromDeclSpec)) {
12267 setTagNameForLinkagePurposes(TD, NewTD);
12268 handleTagNumbering(TD, S);
12269 }
12270 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration);
12271 NewND = NewTD;
12272 }
12273
12274 PushOnScopeChains(NewND, S);
12275 ActOnDocumentableDecl(NewND);
12276 return NewND;
12277}
12278
12279Decl *Sema::ActOnNamespaceAliasDef(Scope *S, SourceLocation NamespaceLoc,
12280 SourceLocation AliasLoc,
12281 IdentifierInfo *Alias, CXXScopeSpec &SS,
12282 SourceLocation IdentLoc,
12283 IdentifierInfo *Ident) {
12284
12285 // Lookup the namespace name.
12286 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName);
12287 LookupParsedName(R, S, &SS);
12288
12289 if (R.isAmbiguous())
12290 return nullptr;
12291
12292 if (R.empty()) {
12293 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) {
12294 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange();
12295 return nullptr;
12296 }
12297 }
12298 assert(!R.isAmbiguous() && !R.empty())((!R.isAmbiguous() && !R.empty()) ? static_cast<void
> (0) : __assert_fail ("!R.isAmbiguous() && !R.empty()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 12298, __PRETTY_FUNCTION__))
;
12299 NamedDecl *ND = R.getRepresentativeDecl();
12300
12301 // Check if we have a previous declaration with the same name.
12302 LookupResult PrevR(*this, Alias, AliasLoc, LookupOrdinaryName,
12303 ForVisibleRedeclaration);
12304 LookupName(PrevR, S);
12305
12306 // Check we're not shadowing a template parameter.
12307 if (PrevR.isSingleResult() && PrevR.getFoundDecl()->isTemplateParameter()) {
12308 DiagnoseTemplateParameterShadow(AliasLoc, PrevR.getFoundDecl());
12309 PrevR.clear();
12310 }
12311
12312 // Filter out any other lookup result from an enclosing scope.
12313 FilterLookupForScope(PrevR, CurContext, S, /*ConsiderLinkage*/false,
12314 /*AllowInlineNamespace*/false);
12315
12316 // Find the previous declaration and check that we can redeclare it.
12317 NamespaceAliasDecl *Prev = nullptr;
12318 if (PrevR.isSingleResult()) {
12319 NamedDecl *PrevDecl = PrevR.getRepresentativeDecl();
12320 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) {
12321 // We already have an alias with the same name that points to the same
12322 // namespace; check that it matches.
12323 if (AD->getNamespace()->Equals(getNamespaceDecl(ND))) {
12324 Prev = AD;
12325 } else if (isVisible(PrevDecl)) {
12326 Diag(AliasLoc, diag::err_redefinition_different_namespace_alias)
12327 << Alias;
12328 Diag(AD->getLocation(), diag::note_previous_namespace_alias)
12329 << AD->getNamespace();
12330 return nullptr;
12331 }
12332 } else if (isVisible(PrevDecl)) {
12333 unsigned DiagID = isa<NamespaceDecl>(PrevDecl->getUnderlyingDecl())
12334 ? diag::err_redefinition
12335 : diag::err_redefinition_different_kind;
12336 Diag(AliasLoc, DiagID) << Alias;
12337 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
12338 return nullptr;
12339 }
12340 }
12341
12342 // The use of a nested name specifier may trigger deprecation warnings.
12343 DiagnoseUseOfDecl(ND, IdentLoc);
12344
12345 NamespaceAliasDecl *AliasDecl =
12346 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc,
12347 Alias, SS.getWithLocInContext(Context),
12348 IdentLoc, ND);
12349 if (Prev)
12350 AliasDecl->setPreviousDecl(Prev);
12351
12352 PushOnScopeChains(AliasDecl, S);
12353 return AliasDecl;
12354}
12355
12356namespace {
12357struct SpecialMemberExceptionSpecInfo
12358 : SpecialMemberVisitor<SpecialMemberExceptionSpecInfo> {
12359 SourceLocation Loc;
12360 Sema::ImplicitExceptionSpecification ExceptSpec;
12361
12362 SpecialMemberExceptionSpecInfo(Sema &S, CXXMethodDecl *MD,
12363 Sema::CXXSpecialMember CSM,
12364 Sema::InheritedConstructorInfo *ICI,
12365 SourceLocation Loc)
12366 : SpecialMemberVisitor(S, MD, CSM, ICI), Loc(Loc), ExceptSpec(S) {}
12367
12368 bool visitBase(CXXBaseSpecifier *Base);
12369 bool visitField(FieldDecl *FD);
12370
12371 void visitClassSubobject(CXXRecordDecl *Class, Subobject Subobj,
12372 unsigned Quals);
12373
12374 void visitSubobjectCall(Subobject Subobj,
12375 Sema::SpecialMemberOverloadResult SMOR);
12376};
12377}
12378
12379bool SpecialMemberExceptionSpecInfo::visitBase(CXXBaseSpecifier *Base) {
12380 auto *RT = Base->getType()->getAs<RecordType>();
12381 if (!RT)
12382 return false;
12383
12384 auto *BaseClass = cast<CXXRecordDecl>(RT->getDecl());
12385 Sema::SpecialMemberOverloadResult SMOR = lookupInheritedCtor(BaseClass);
12386 if (auto *BaseCtor = SMOR.getMethod()) {
12387 visitSubobjectCall(Base, BaseCtor);
12388 return false;
12389 }
12390
12391 visitClassSubobject(BaseClass, Base, 0);
12392 return false;
12393}
12394
12395bool SpecialMemberExceptionSpecInfo::visitField(FieldDecl *FD) {
12396 if (CSM == Sema::CXXDefaultConstructor && FD->hasInClassInitializer()) {
12397 Expr *E = FD->getInClassInitializer();
12398 if (!E)
12399 // FIXME: It's a little wasteful to build and throw away a
12400 // CXXDefaultInitExpr here.
12401 // FIXME: We should have a single context note pointing at Loc, and
12402 // this location should be MD->getLocation() instead, since that's
12403 // the location where we actually use the default init expression.
12404 E = S.BuildCXXDefaultInitExpr(Loc, FD).get();
12405 if (E)
12406 ExceptSpec.CalledExpr(E);
12407 } else if (auto *RT = S.Context.getBaseElementType(FD->getType())
12408 ->getAs<RecordType>()) {
12409 visitClassSubobject(cast<CXXRecordDecl>(RT->getDecl()), FD,
12410 FD->getType().getCVRQualifiers());
12411 }
12412 return false;
12413}
12414
12415void SpecialMemberExceptionSpecInfo::visitClassSubobject(CXXRecordDecl *Class,
12416 Subobject Subobj,
12417 unsigned Quals) {
12418 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>();
12419 bool IsMutable = Field && Field->isMutable();
12420 visitSubobjectCall(Subobj, lookupIn(Class, Quals, IsMutable));
12421}
12422
12423void SpecialMemberExceptionSpecInfo::visitSubobjectCall(
12424 Subobject Subobj, Sema::SpecialMemberOverloadResult SMOR) {
12425 // Note, if lookup fails, it doesn't matter what exception specification we
12426 // choose because the special member will be deleted.
12427 if (CXXMethodDecl *MD = SMOR.getMethod())
12428 ExceptSpec.CalledDecl(getSubobjectLoc(Subobj), MD);
12429}
12430
12431bool Sema::tryResolveExplicitSpecifier(ExplicitSpecifier &ExplicitSpec) {
12432 llvm::APSInt Result;
12433 ExprResult Converted = CheckConvertedConstantExpression(
12434 ExplicitSpec.getExpr(), Context.BoolTy, Result, CCEK_ExplicitBool);
12435 ExplicitSpec.setExpr(Converted.get());
12436 if (Converted.isUsable() && !Converted.get()->isValueDependent()) {
12437 ExplicitSpec.setKind(Result.getBoolValue()
12438 ? ExplicitSpecKind::ResolvedTrue
12439 : ExplicitSpecKind::ResolvedFalse);
12440 return true;
12441 }
12442 ExplicitSpec.setKind(ExplicitSpecKind::Unresolved);
12443 return false;
12444}
12445
12446ExplicitSpecifier Sema::ActOnExplicitBoolSpecifier(Expr *ExplicitExpr) {
12447 ExplicitSpecifier ES(ExplicitExpr, ExplicitSpecKind::Unresolved);
12448 if (!ExplicitExpr->isTypeDependent())
12449 tryResolveExplicitSpecifier(ES);
12450 return ES;
12451}
12452
12453static Sema::ImplicitExceptionSpecification
12454ComputeDefaultedSpecialMemberExceptionSpec(
12455 Sema &S, SourceLocation Loc, CXXMethodDecl *MD, Sema::CXXSpecialMember CSM,
12456 Sema::InheritedConstructorInfo *ICI) {
12457 ComputingExceptionSpec CES(S, MD, Loc);
12458
12459 CXXRecordDecl *ClassDecl = MD->getParent();
12460
12461 // C++ [except.spec]p14:
12462 // An implicitly declared special member function (Clause 12) shall have an
12463 // exception-specification. [...]
12464 SpecialMemberExceptionSpecInfo Info(S, MD, CSM, ICI, MD->getLocation());
12465 if (ClassDecl->isInvalidDecl())
12466 return Info.ExceptSpec;
12467
12468 // FIXME: If this diagnostic fires, we're probably missing a check for
12469 // attempting to resolve an exception specification before it's known
12470 // at a higher level.
12471 if (S.RequireCompleteType(MD->getLocation(),
12472 S.Context.getRecordType(ClassDecl),
12473 diag::err_exception_spec_incomplete_type))
12474 return Info.ExceptSpec;
12475
12476 // C++1z [except.spec]p7:
12477 // [Look for exceptions thrown by] a constructor selected [...] to
12478 // initialize a potentially constructed subobject,
12479 // C++1z [except.spec]p8:
12480 // The exception specification for an implicitly-declared destructor, or a
12481 // destructor without a noexcept-specifier, is potentially-throwing if and
12482 // only if any of the destructors for any of its potentially constructed
12483 // subojects is potentially throwing.
12484 // FIXME: We respect the first rule but ignore the "potentially constructed"
12485 // in the second rule to resolve a core issue (no number yet) that would have
12486 // us reject:
12487 // struct A { virtual void f() = 0; virtual ~A() noexcept(false) = 0; };
12488 // struct B : A {};
12489 // struct C : B { void f(); };
12490 // ... due to giving B::~B() a non-throwing exception specification.
12491 Info.visit(Info.IsConstructor ? Info.VisitPotentiallyConstructedBases
12492 : Info.VisitAllBases);
12493
12494 return Info.ExceptSpec;
12495}
12496
12497namespace {
12498/// RAII object to register a special member as being currently declared.
12499struct DeclaringSpecialMember {
12500 Sema &S;
12501 Sema::SpecialMemberDecl D;
12502 Sema::ContextRAII SavedContext;
12503 bool WasAlreadyBeingDeclared;
12504
12505 DeclaringSpecialMember(Sema &S, CXXRecordDecl *RD, Sema::CXXSpecialMember CSM)
12506 : S(S), D(RD, CSM), SavedContext(S, RD) {
12507 WasAlreadyBeingDeclared = !S.SpecialMembersBeingDeclared.insert(D).second;
12508 if (WasAlreadyBeingDeclared)
12509 // This almost never happens, but if it does, ensure that our cache
12510 // doesn't contain a stale result.
12511 S.SpecialMemberCache.clear();
12512 else {
12513 // Register a note to be produced if we encounter an error while
12514 // declaring the special member.
12515 Sema::CodeSynthesisContext Ctx;
12516 Ctx.Kind = Sema::CodeSynthesisContext::DeclaringSpecialMember;
12517 // FIXME: We don't have a location to use here. Using the class's
12518 // location maintains the fiction that we declare all special members
12519 // with the class, but (1) it's not clear that lying about that helps our
12520 // users understand what's going on, and (2) there may be outer contexts
12521 // on the stack (some of which are relevant) and printing them exposes
12522 // our lies.
12523 Ctx.PointOfInstantiation = RD->getLocation();
12524 Ctx.Entity = RD;
12525 Ctx.SpecialMember = CSM;
12526 S.pushCodeSynthesisContext(Ctx);
12527 }
12528 }
12529 ~DeclaringSpecialMember() {
12530 if (!WasAlreadyBeingDeclared) {
12531 S.SpecialMembersBeingDeclared.erase(D);
12532 S.popCodeSynthesisContext();
12533 }
12534 }
12535
12536 /// Are we already trying to declare this special member?
12537 bool isAlreadyBeingDeclared() const {
12538 return WasAlreadyBeingDeclared;
12539 }
12540};
12541}
12542
12543void Sema::CheckImplicitSpecialMemberDeclaration(Scope *S, FunctionDecl *FD) {
12544 // Look up any existing declarations, but don't trigger declaration of all
12545 // implicit special members with this name.
12546 DeclarationName Name = FD->getDeclName();
12547 LookupResult R(*this, Name, SourceLocation(), LookupOrdinaryName,
12548 ForExternalRedeclaration);
12549 for (auto *D : FD->getParent()->lookup(Name))
12550 if (auto *Acceptable = R.getAcceptableDecl(D))
12551 R.addDecl(Acceptable);
12552 R.resolveKind();
12553 R.suppressDiagnostics();
12554
12555 CheckFunctionDeclaration(S, FD, R, /*IsMemberSpecialization*/false);
12556}
12557
12558void Sema::setupImplicitSpecialMemberType(CXXMethodDecl *SpecialMem,
12559 QualType ResultTy,
12560 ArrayRef<QualType> Args) {
12561 // Build an exception specification pointing back at this constructor.
12562 FunctionProtoType::ExtProtoInfo EPI = getImplicitMethodEPI(*this, SpecialMem);
12563
12564 LangAS AS = getDefaultCXXMethodAddrSpace();
12565 if (AS != LangAS::Default) {
12566 EPI.TypeQuals.addAddressSpace(AS);
12567 }
12568
12569 auto QT = Context.getFunctionType(ResultTy, Args, EPI);
12570 SpecialMem->setType(QT);
12571}
12572
12573CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor(
12574 CXXRecordDecl *ClassDecl) {
12575 // C++ [class.ctor]p5:
12576 // A default constructor for a class X is a constructor of class X
12577 // that can be called without an argument. If there is no
12578 // user-declared constructor for class X, a default constructor is
12579 // implicitly declared. An implicitly-declared default constructor
12580 // is an inline public member of its class.
12581 assert(ClassDecl->needsImplicitDefaultConstructor() &&((ClassDecl->needsImplicitDefaultConstructor() && "Should not build implicit default constructor!"
) ? static_cast<void> (0) : __assert_fail ("ClassDecl->needsImplicitDefaultConstructor() && \"Should not build implicit default constructor!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 12582, __PRETTY_FUNCTION__))
12582 "Should not build implicit default constructor!")((ClassDecl->needsImplicitDefaultConstructor() && "Should not build implicit default constructor!"
) ? static_cast<void> (0) : __assert_fail ("ClassDecl->needsImplicitDefaultConstructor() && \"Should not build implicit default constructor!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 12582, __PRETTY_FUNCTION__))
;
12583
12584 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDefaultConstructor);
12585 if (DSM.isAlreadyBeingDeclared())
12586 return nullptr;
12587
12588 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
12589 CXXDefaultConstructor,
12590 false);
12591
12592 // Create the actual constructor declaration.
12593 CanQualType ClassType
12594 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
12595 SourceLocation ClassLoc = ClassDecl->getLocation();
12596 DeclarationName Name
12597 = Context.DeclarationNames.getCXXConstructorName(ClassType);
12598 DeclarationNameInfo NameInfo(Name, ClassLoc);
12599 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create(
12600 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/ QualType(),
12601 /*TInfo=*/nullptr, ExplicitSpecifier(),
12602 /*isInline=*/true, /*isImplicitlyDeclared=*/true,
12603 Constexpr ? CSK_constexpr : CSK_unspecified);
12604 DefaultCon->setAccess(AS_public);
12605 DefaultCon->setDefaulted();
12606
12607 if (getLangOpts().CUDA) {
12608 inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXDefaultConstructor,
12609 DefaultCon,
12610 /* ConstRHS */ false,
12611 /* Diagnose */ false);
12612 }
12613
12614 setupImplicitSpecialMemberType(DefaultCon, Context.VoidTy, None);
12615
12616 // We don't need to use SpecialMemberIsTrivial here; triviality for default
12617 // constructors is easy to compute.
12618 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor());
12619
12620 // Note that we have declared this constructor.
12621 ++getASTContext().NumImplicitDefaultConstructorsDeclared;
12622
12623 Scope *S = getScopeForContext(ClassDecl);
12624 CheckImplicitSpecialMemberDeclaration(S, DefaultCon);
12625
12626 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor))
12627 SetDeclDeleted(DefaultCon, ClassLoc);
12628
12629 if (S)
12630 PushOnScopeChains(DefaultCon, S, false);
12631 ClassDecl->addDecl(DefaultCon);
12632
12633 return DefaultCon;
12634}
12635
12636void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation,
12637 CXXConstructorDecl *Constructor) {
12638 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() &&(((Constructor->isDefaulted() && Constructor->isDefaultConstructor
() && !Constructor->doesThisDeclarationHaveABody()
&& !Constructor->isDeleted()) && "DefineImplicitDefaultConstructor - call it for implicit default ctor"
) ? static_cast<void> (0) : __assert_fail ("(Constructor->isDefaulted() && Constructor->isDefaultConstructor() && !Constructor->doesThisDeclarationHaveABody() && !Constructor->isDeleted()) && \"DefineImplicitDefaultConstructor - call it for implicit default ctor\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 12641, __PRETTY_FUNCTION__))
12639 !Constructor->doesThisDeclarationHaveABody() &&(((Constructor->isDefaulted() && Constructor->isDefaultConstructor
() && !Constructor->doesThisDeclarationHaveABody()
&& !Constructor->isDeleted()) && "DefineImplicitDefaultConstructor - call it for implicit default ctor"
) ? static_cast<void> (0) : __assert_fail ("(Constructor->isDefaulted() && Constructor->isDefaultConstructor() && !Constructor->doesThisDeclarationHaveABody() && !Constructor->isDeleted()) && \"DefineImplicitDefaultConstructor - call it for implicit default ctor\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 12641, __PRETTY_FUNCTION__))
12640 !Constructor->isDeleted()) &&(((Constructor->isDefaulted() && Constructor->isDefaultConstructor
() && !Constructor->doesThisDeclarationHaveABody()
&& !Constructor->isDeleted()) && "DefineImplicitDefaultConstructor - call it for implicit default ctor"
) ? static_cast<void> (0) : __assert_fail ("(Constructor->isDefaulted() && Constructor->isDefaultConstructor() && !Constructor->doesThisDeclarationHaveABody() && !Constructor->isDeleted()) && \"DefineImplicitDefaultConstructor - call it for implicit default ctor\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 12641, __PRETTY_FUNCTION__))
12641 "DefineImplicitDefaultConstructor - call it for implicit default ctor")(((Constructor->isDefaulted() && Constructor->isDefaultConstructor
() && !Constructor->doesThisDeclarationHaveABody()
&& !Constructor->isDeleted()) && "DefineImplicitDefaultConstructor - call it for implicit default ctor"
) ? static_cast<void> (0) : __assert_fail ("(Constructor->isDefaulted() && Constructor->isDefaultConstructor() && !Constructor->doesThisDeclarationHaveABody() && !Constructor->isDeleted()) && \"DefineImplicitDefaultConstructor - call it for implicit default ctor\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 12641, __PRETTY_FUNCTION__))
;
12642 if (Constructor->willHaveBody() || Constructor->isInvalidDecl())
12643 return;
12644
12645 CXXRecordDecl *ClassDecl = Constructor->getParent();
12646 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor")((ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"
) ? static_cast<void> (0) : __assert_fail ("ClassDecl && \"DefineImplicitDefaultConstructor - invalid constructor\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 12646, __PRETTY_FUNCTION__))
;
12647
12648 SynthesizedFunctionScope Scope(*this, Constructor);
12649
12650 // The exception specification is needed because we are defining the
12651 // function.
12652 ResolveExceptionSpec(CurrentLocation,
12653 Constructor->getType()->castAs<FunctionProtoType>());
12654 MarkVTableUsed(CurrentLocation, ClassDecl);
12655
12656 // Add a context note for diagnostics produced after this point.
12657 Scope.addContextNote(CurrentLocation);
12658
12659 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false)) {
12660 Constructor->setInvalidDecl();
12661 return;
12662 }
12663
12664 SourceLocation Loc = Constructor->getEndLoc().isValid()
12665 ? Constructor->getEndLoc()
12666 : Constructor->getLocation();
12667 Constructor->setBody(new (Context) CompoundStmt(Loc));
12668 Constructor->markUsed(Context);
12669
12670 if (ASTMutationListener *L = getASTMutationListener()) {
12671 L->CompletedImplicitDefinition(Constructor);
12672 }
12673
12674 DiagnoseUninitializedFields(*this, Constructor);
12675}
12676
12677void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) {
12678 // Perform any delayed checks on exception specifications.
12679 CheckDelayedMemberExceptionSpecs();
12680}
12681
12682/// Find or create the fake constructor we synthesize to model constructing an
12683/// object of a derived class via a constructor of a base class.
12684CXXConstructorDecl *
12685Sema::findInheritingConstructor(SourceLocation Loc,
12686 CXXConstructorDecl *BaseCtor,
12687 ConstructorUsingShadowDecl *Shadow) {
12688 CXXRecordDecl *Derived = Shadow->getParent();
12689 SourceLocation UsingLoc = Shadow->getLocation();
12690
12691 // FIXME: Add a new kind of DeclarationName for an inherited constructor.
12692 // For now we use the name of the base class constructor as a member of the
12693 // derived class to indicate a (fake) inherited constructor name.
12694 DeclarationName Name = BaseCtor->getDeclName();
12695
12696 // Check to see if we already have a fake constructor for this inherited
12697 // constructor call.
12698 for (NamedDecl *Ctor : Derived->lookup(Name))
12699 if (declaresSameEntity(cast<CXXConstructorDecl>(Ctor)
12700 ->getInheritedConstructor()
12701 .getConstructor(),
12702 BaseCtor))
12703 return cast<CXXConstructorDecl>(Ctor);
12704
12705 DeclarationNameInfo NameInfo(Name, UsingLoc);
12706 TypeSourceInfo *TInfo =
12707 Context.getTrivialTypeSourceInfo(BaseCtor->getType(), UsingLoc);
12708 FunctionProtoTypeLoc ProtoLoc =
12709 TInfo->getTypeLoc().IgnoreParens().castAs<FunctionProtoTypeLoc>();
12710
12711 // Check the inherited constructor is valid and find the list of base classes
12712 // from which it was inherited.
12713 InheritedConstructorInfo ICI(*this, Loc, Shadow);
12714
12715 bool Constexpr =
12716 BaseCtor->isConstexpr() &&
12717 defaultedSpecialMemberIsConstexpr(*this, Derived, CXXDefaultConstructor,
12718 false, BaseCtor, &ICI);
12719
12720 CXXConstructorDecl *DerivedCtor = CXXConstructorDecl::Create(
12721 Context, Derived, UsingLoc, NameInfo, TInfo->getType(), TInfo,
12722 BaseCtor->getExplicitSpecifier(), /*isInline=*/true,
12723 /*isImplicitlyDeclared=*/true,
12724 Constexpr ? BaseCtor->getConstexprKind() : CSK_unspecified,
12725 InheritedConstructor(Shadow, BaseCtor),
12726 BaseCtor->getTrailingRequiresClause());
12727 if (Shadow->isInvalidDecl())
12728 DerivedCtor->setInvalidDecl();
12729
12730 // Build an unevaluated exception specification for this fake constructor.
12731 const FunctionProtoType *FPT = TInfo->getType()->castAs<FunctionProtoType>();
12732 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
12733 EPI.ExceptionSpec.Type = EST_Unevaluated;
12734 EPI.ExceptionSpec.SourceDecl = DerivedCtor;
12735 DerivedCtor->setType(Context.getFunctionType(FPT->getReturnType(),
12736 FPT->getParamTypes(), EPI));
12737
12738 // Build the parameter declarations.
12739 SmallVector<ParmVarDecl *, 16> ParamDecls;
12740 for (unsigned I = 0, N = FPT->getNumParams(); I != N; ++I) {
12741 TypeSourceInfo *TInfo =
12742 Context.getTrivialTypeSourceInfo(FPT->getParamType(I), UsingLoc);
12743 ParmVarDecl *PD = ParmVarDecl::Create(
12744 Context, DerivedCtor, UsingLoc, UsingLoc, /*IdentifierInfo=*/nullptr,
12745 FPT->getParamType(I), TInfo, SC_None, /*DefArg=*/nullptr);
12746 PD->setScopeInfo(0, I);
12747 PD->setImplicit();
12748 // Ensure attributes are propagated onto parameters (this matters for
12749 // format, pass_object_size, ...).
12750 mergeDeclAttributes(PD, BaseCtor->getParamDecl(I));
12751 ParamDecls.push_back(PD);
12752 ProtoLoc.setParam(I, PD);
12753 }
12754
12755 // Set up the new constructor.
12756 assert(!BaseCtor->isDeleted() && "should not use deleted constructor")((!BaseCtor->isDeleted() && "should not use deleted constructor"
) ? static_cast<void> (0) : __assert_fail ("!BaseCtor->isDeleted() && \"should not use deleted constructor\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 12756, __PRETTY_FUNCTION__))
;
12757 DerivedCtor->setAccess(BaseCtor->getAccess());
12758 DerivedCtor->setParams(ParamDecls);
12759 Derived->addDecl(DerivedCtor);
12760
12761 if (ShouldDeleteSpecialMember(DerivedCtor, CXXDefaultConstructor, &ICI))
12762 SetDeclDeleted(DerivedCtor, UsingLoc);
12763
12764 return DerivedCtor;
12765}
12766
12767void Sema::NoteDeletedInheritingConstructor(CXXConstructorDecl *Ctor) {
12768 InheritedConstructorInfo ICI(*this, Ctor->getLocation(),
12769 Ctor->getInheritedConstructor().getShadowDecl());
12770 ShouldDeleteSpecialMember(Ctor, CXXDefaultConstructor, &ICI,
12771 /*Diagnose*/true);
12772}
12773
12774void Sema::DefineInheritingConstructor(SourceLocation CurrentLocation,
12775 CXXConstructorDecl *Constructor) {
12776 CXXRecordDecl *ClassDecl = Constructor->getParent();
12777 assert(Constructor->getInheritedConstructor() &&((Constructor->getInheritedConstructor() && !Constructor
->doesThisDeclarationHaveABody() && !Constructor->
isDeleted()) ? static_cast<void> (0) : __assert_fail ("Constructor->getInheritedConstructor() && !Constructor->doesThisDeclarationHaveABody() && !Constructor->isDeleted()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 12779, __PRETTY_FUNCTION__))
12778 !Constructor->doesThisDeclarationHaveABody() &&((Constructor->getInheritedConstructor() && !Constructor
->doesThisDeclarationHaveABody() && !Constructor->
isDeleted()) ? static_cast<void> (0) : __assert_fail ("Constructor->getInheritedConstructor() && !Constructor->doesThisDeclarationHaveABody() && !Constructor->isDeleted()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 12779, __PRETTY_FUNCTION__))
12779 !Constructor->isDeleted())((Constructor->getInheritedConstructor() && !Constructor
->doesThisDeclarationHaveABody() && !Constructor->
isDeleted()) ? static_cast<void> (0) : __assert_fail ("Constructor->getInheritedConstructor() && !Constructor->doesThisDeclarationHaveABody() && !Constructor->isDeleted()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 12779, __PRETTY_FUNCTION__))
;
12780 if (Constructor->willHaveBody() || Constructor->isInvalidDecl())
12781 return;
12782
12783 // Initializations are performed "as if by a defaulted default constructor",
12784 // so enter the appropriate scope.
12785 SynthesizedFunctionScope Scope(*this, Constructor);
12786
12787 // The exception specification is needed because we are defining the
12788 // function.
12789 ResolveExceptionSpec(CurrentLocation,
12790 Constructor->getType()->castAs<FunctionProtoType>());
12791 MarkVTableUsed(CurrentLocation, ClassDecl);
12792
12793 // Add a context note for diagnostics produced after this point.
12794 Scope.addContextNote(CurrentLocation);
12795
12796 ConstructorUsingShadowDecl *Shadow =
12797 Constructor->getInheritedConstructor().getShadowDecl();
12798 CXXConstructorDecl *InheritedCtor =
12799 Constructor->getInheritedConstructor().getConstructor();
12800
12801 // [class.inhctor.init]p1:
12802 // initialization proceeds as if a defaulted default constructor is used to
12803 // initialize the D object and each base class subobject from which the
12804 // constructor was inherited
12805
12806 InheritedConstructorInfo ICI(*this, CurrentLocation, Shadow);
12807 CXXRecordDecl *RD = Shadow->getParent();
12808 SourceLocation InitLoc = Shadow->getLocation();
12809
12810 // Build explicit initializers for all base classes from which the
12811 // constructor was inherited.
12812 SmallVector<CXXCtorInitializer*, 8> Inits;
12813 for (bool VBase : {false, true}) {
12814 for (CXXBaseSpecifier &B : VBase ? RD->vbases() : RD->bases()) {
12815 if (B.isVirtual() != VBase)
12816 continue;
12817
12818 auto *BaseRD = B.getType()->getAsCXXRecordDecl();
12819 if (!BaseRD)
12820 continue;
12821
12822 auto BaseCtor = ICI.findConstructorForBase(BaseRD, InheritedCtor);
12823 if (!BaseCtor.first)
12824 continue;
12825
12826 MarkFunctionReferenced(CurrentLocation, BaseCtor.first);
12827 ExprResult Init = new (Context) CXXInheritedCtorInitExpr(
12828 InitLoc, B.getType(), BaseCtor.first, VBase, BaseCtor.second);
12829
12830 auto *TInfo = Context.getTrivialTypeSourceInfo(B.getType(), InitLoc);
12831 Inits.push_back(new (Context) CXXCtorInitializer(
12832 Context, TInfo, VBase, InitLoc, Init.get(), InitLoc,
12833 SourceLocation()));
12834 }
12835 }
12836
12837 // We now proceed as if for a defaulted default constructor, with the relevant
12838 // initializers replaced.
12839
12840 if (SetCtorInitializers(Constructor, /*AnyErrors*/false, Inits)) {
12841 Constructor->setInvalidDecl();
12842 return;
12843 }
12844
12845 Constructor->setBody(new (Context) CompoundStmt(InitLoc));
12846 Constructor->markUsed(Context);
12847
12848 if (ASTMutationListener *L = getASTMutationListener()) {
12849 L->CompletedImplicitDefinition(Constructor);
12850 }
12851
12852 DiagnoseUninitializedFields(*this, Constructor);
12853}
12854
12855CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) {
12856 // C++ [class.dtor]p2:
12857 // If a class has no user-declared destructor, a destructor is
12858 // declared implicitly. An implicitly-declared destructor is an
12859 // inline public member of its class.
12860 assert(ClassDecl->needsImplicitDestructor())((ClassDecl->needsImplicitDestructor()) ? static_cast<void
> (0) : __assert_fail ("ClassDecl->needsImplicitDestructor()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 12860, __PRETTY_FUNCTION__))
;
12861
12862 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDestructor);
12863 if (DSM.isAlreadyBeingDeclared())
12864 return nullptr;
12865
12866 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
12867 CXXDestructor,
12868 false);
12869
12870 // Create the actual destructor declaration.
12871 CanQualType ClassType
12872 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
12873 SourceLocation ClassLoc = ClassDecl->getLocation();
12874 DeclarationName Name
12875 = Context.DeclarationNames.getCXXDestructorName(ClassType);
12876 DeclarationNameInfo NameInfo(Name, ClassLoc);
12877 CXXDestructorDecl *Destructor =
12878 CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo,
12879 QualType(), nullptr, /*isInline=*/true,
12880 /*isImplicitlyDeclared=*/true,
12881 Constexpr ? CSK_constexpr : CSK_unspecified);
12882 Destructor->setAccess(AS_public);
12883 Destructor->setDefaulted();
12884
12885 if (getLangOpts().CUDA) {
12886 inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXDestructor,
12887 Destructor,
12888 /* ConstRHS */ false,
12889 /* Diagnose */ false);
12890 }
12891
12892 setupImplicitSpecialMemberType(Destructor, Context.VoidTy, None);
12893
12894 // We don't need to use SpecialMemberIsTrivial here; triviality for
12895 // destructors is easy to compute.
12896 Destructor->setTrivial(ClassDecl->hasTrivialDestructor());
12897 Destructor->setTrivialForCall(ClassDecl->hasAttr<TrivialABIAttr>() ||
12898 ClassDecl->hasTrivialDestructorForCall());
12899
12900 // Note that we have declared this destructor.
12901 ++getASTContext().NumImplicitDestructorsDeclared;
12902
12903 Scope *S = getScopeForContext(ClassDecl);
12904 CheckImplicitSpecialMemberDeclaration(S, Destructor);
12905
12906 // We can't check whether an implicit destructor is deleted before we complete
12907 // the definition of the class, because its validity depends on the alignment
12908 // of the class. We'll check this from ActOnFields once the class is complete.
12909 if (ClassDecl->isCompleteDefinition() &&
12910 ShouldDeleteSpecialMember(Destructor, CXXDestructor))
12911 SetDeclDeleted(Destructor, ClassLoc);
12912
12913 // Introduce this destructor into its scope.
12914 if (S)
12915 PushOnScopeChains(Destructor, S, false);
12916 ClassDecl->addDecl(Destructor);
12917
12918 return Destructor;
12919}
12920
12921void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation,
12922 CXXDestructorDecl *Destructor) {
12923 assert((Destructor->isDefaulted() &&(((Destructor->isDefaulted() && !Destructor->doesThisDeclarationHaveABody
() && !Destructor->isDeleted()) && "DefineImplicitDestructor - call it for implicit default dtor"
) ? static_cast<void> (0) : __assert_fail ("(Destructor->isDefaulted() && !Destructor->doesThisDeclarationHaveABody() && !Destructor->isDeleted()) && \"DefineImplicitDestructor - call it for implicit default dtor\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 12926, __PRETTY_FUNCTION__))
12924 !Destructor->doesThisDeclarationHaveABody() &&(((Destructor->isDefaulted() && !Destructor->doesThisDeclarationHaveABody
() && !Destructor->isDeleted()) && "DefineImplicitDestructor - call it for implicit default dtor"
) ? static_cast<void> (0) : __assert_fail ("(Destructor->isDefaulted() && !Destructor->doesThisDeclarationHaveABody() && !Destructor->isDeleted()) && \"DefineImplicitDestructor - call it for implicit default dtor\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 12926, __PRETTY_FUNCTION__))
12925 !Destructor->isDeleted()) &&(((Destructor->isDefaulted() && !Destructor->doesThisDeclarationHaveABody
() && !Destructor->isDeleted()) && "DefineImplicitDestructor - call it for implicit default dtor"
) ? static_cast<void> (0) : __assert_fail ("(Destructor->isDefaulted() && !Destructor->doesThisDeclarationHaveABody() && !Destructor->isDeleted()) && \"DefineImplicitDestructor - call it for implicit default dtor\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 12926, __PRETTY_FUNCTION__))
12926 "DefineImplicitDestructor - call it for implicit default dtor")(((Destructor->isDefaulted() && !Destructor->doesThisDeclarationHaveABody
() && !Destructor->isDeleted()) && "DefineImplicitDestructor - call it for implicit default dtor"
) ? static_cast<void> (0) : __assert_fail ("(Destructor->isDefaulted() && !Destructor->doesThisDeclarationHaveABody() && !Destructor->isDeleted()) && \"DefineImplicitDestructor - call it for implicit default dtor\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 12926, __PRETTY_FUNCTION__))
;
12927 if (Destructor->willHaveBody() || Destructor->isInvalidDecl())
12928 return;
12929
12930 CXXRecordDecl *ClassDecl = Destructor->getParent();
12931 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor")((ClassDecl && "DefineImplicitDestructor - invalid destructor"
) ? static_cast<void> (0) : __assert_fail ("ClassDecl && \"DefineImplicitDestructor - invalid destructor\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 12931, __PRETTY_FUNCTION__))
;
12932
12933 SynthesizedFunctionScope Scope(*this, Destructor);
12934
12935 // The exception specification is needed because we are defining the
12936 // function.
12937 ResolveExceptionSpec(CurrentLocation,
12938 Destructor->getType()->castAs<FunctionProtoType>());
12939 MarkVTableUsed(CurrentLocation, ClassDecl);
12940
12941 // Add a context note for diagnostics produced after this point.
12942 Scope.addContextNote(CurrentLocation);
12943
12944 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(),
12945 Destructor->getParent());
12946
12947 if (CheckDestructor(Destructor)) {
12948 Destructor->setInvalidDecl();
12949 return;
12950 }
12951
12952 SourceLocation Loc = Destructor->getEndLoc().isValid()
12953 ? Destructor->getEndLoc()
12954 : Destructor->getLocation();
12955 Destructor->setBody(new (Context) CompoundStmt(Loc));
12956 Destructor->markUsed(Context);
12957
12958 if (ASTMutationListener *L = getASTMutationListener()) {
12959 L->CompletedImplicitDefinition(Destructor);
12960 }
12961}
12962
12963/// Perform any semantic analysis which needs to be delayed until all
12964/// pending class member declarations have been parsed.
12965void Sema::ActOnFinishCXXMemberDecls() {
12966 // If the context is an invalid C++ class, just suppress these checks.
12967 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(CurContext)) {
12968 if (Record->isInvalidDecl()) {
12969 DelayedOverridingExceptionSpecChecks.clear();
12970 DelayedEquivalentExceptionSpecChecks.clear();
12971 return;
12972 }
12973 checkForMultipleExportedDefaultConstructors(*this, Record);
12974 }
12975}
12976
12977void Sema::ActOnFinishCXXNonNestedClass() {
12978 referenceDLLExportedClassMethods();
12979
12980 if (!DelayedDllExportMemberFunctions.empty()) {
12981 SmallVector<CXXMethodDecl*, 4> WorkList;
12982 std::swap(DelayedDllExportMemberFunctions, WorkList);
12983 for (CXXMethodDecl *M : WorkList) {
12984 DefineImplicitSpecialMember(*this, M, M->getLocation());
12985
12986 // Pass the method to the consumer to get emitted. This is not necessary
12987 // for explicit instantiation definitions, as they will get emitted
12988 // anyway.
12989 if (M->getParent()->getTemplateSpecializationKind() !=
12990 TSK_ExplicitInstantiationDefinition)
12991 ActOnFinishInlineFunctionDef(M);
12992 }
12993 }
12994}
12995
12996void Sema::referenceDLLExportedClassMethods() {
12997 if (!DelayedDllExportClasses.empty()) {
12998 // Calling ReferenceDllExportedMembers might cause the current function to
12999 // be called again, so use a local copy of DelayedDllExportClasses.
13000 SmallVector<CXXRecordDecl *, 4> WorkList;
13001 std::swap(DelayedDllExportClasses, WorkList);
13002 for (CXXRecordDecl *Class : WorkList)
13003 ReferenceDllExportedMembers(*this, Class);
13004 }
13005}
13006
13007void Sema::AdjustDestructorExceptionSpec(CXXDestructorDecl *Destructor) {
13008 assert(getLangOpts().CPlusPlus11 &&((getLangOpts().CPlusPlus11 && "adjusting dtor exception specs was introduced in c++11"
) ? static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus11 && \"adjusting dtor exception specs was introduced in c++11\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 13009, __PRETTY_FUNCTION__))
13009 "adjusting dtor exception specs was introduced in c++11")((getLangOpts().CPlusPlus11 && "adjusting dtor exception specs was introduced in c++11"
) ? static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus11 && \"adjusting dtor exception specs was introduced in c++11\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 13009, __PRETTY_FUNCTION__))
;
13010
13011 if (Destructor->isDependentContext())
13012 return;
13013
13014 // C++11 [class.dtor]p3:
13015 // A declaration of a destructor that does not have an exception-
13016 // specification is implicitly considered to have the same exception-
13017 // specification as an implicit declaration.
13018 const FunctionProtoType *DtorType = Destructor->getType()->
13019 getAs<FunctionProtoType>();
13020 if (DtorType->hasExceptionSpec())
13021 return;
13022
13023 // Replace the destructor's type, building off the existing one. Fortunately,
13024 // the only thing of interest in the destructor type is its extended info.
13025 // The return and arguments are fixed.
13026 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo();
13027 EPI.ExceptionSpec.Type = EST_Unevaluated;
13028 EPI.ExceptionSpec.SourceDecl = Destructor;
13029 Destructor->setType(Context.getFunctionType(Context.VoidTy, None, EPI));
13030
13031 // FIXME: If the destructor has a body that could throw, and the newly created
13032 // spec doesn't allow exceptions, we should emit a warning, because this
13033 // change in behavior can break conforming C++03 programs at runtime.
13034 // However, we don't have a body or an exception specification yet, so it
13035 // needs to be done somewhere else.
13036}
13037
13038namespace {
13039/// An abstract base class for all helper classes used in building the
13040// copy/move operators. These classes serve as factory functions and help us
13041// avoid using the same Expr* in the AST twice.
13042class ExprBuilder {
13043 ExprBuilder(const ExprBuilder&) = delete;
13044 ExprBuilder &operator=(const ExprBuilder&) = delete;
13045
13046protected:
13047 static Expr *assertNotNull(Expr *E) {
13048 assert(E && "Expression construction must not fail.")((E && "Expression construction must not fail.") ? static_cast
<void> (0) : __assert_fail ("E && \"Expression construction must not fail.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 13048, __PRETTY_FUNCTION__))
;
13049 return E;
13050 }
13051
13052public:
13053 ExprBuilder() {}
13054 virtual ~ExprBuilder() {}
13055
13056 virtual Expr *build(Sema &S, SourceLocation Loc) const = 0;
13057};
13058
13059class RefBuilder: public ExprBuilder {
13060 VarDecl *Var;
13061 QualType VarType;
13062
13063public:
13064 Expr *build(Sema &S, SourceLocation Loc) const override {
13065 return assertNotNull(S.BuildDeclRefExpr(Var, VarType, VK_LValue, Loc));
13066 }
13067
13068 RefBuilder(VarDecl *Var, QualType VarType)
13069 : Var(Var), VarType(VarType) {}
13070};
13071
13072class ThisBuilder: public ExprBuilder {
13073public:
13074 Expr *build(Sema &S, SourceLocation Loc) const override {
13075 return assertNotNull(S.ActOnCXXThis(Loc).getAs<Expr>());
13076 }
13077};
13078
13079class CastBuilder: public ExprBuilder {
13080 const ExprBuilder &Builder;
13081 QualType Type;
13082 ExprValueKind Kind;
13083 const CXXCastPath &Path;
13084
13085public:
13086 Expr *build(Sema &S, SourceLocation Loc) const override {
13087 return assertNotNull(S.ImpCastExprToType(Builder.build(S, Loc), Type,
13088 CK_UncheckedDerivedToBase, Kind,
13089 &Path).get());
13090 }
13091
13092 CastBuilder(const ExprBuilder &Builder, QualType Type, ExprValueKind Kind,
13093 const CXXCastPath &Path)
13094 : Builder(Builder), Type(Type), Kind(Kind), Path(Path) {}
13095};
13096
13097class DerefBuilder: public ExprBuilder {
13098 const ExprBuilder &Builder;
13099
13100public:
13101 Expr *build(Sema &S, SourceLocation Loc) const override {
13102 return assertNotNull(
13103 S.CreateBuiltinUnaryOp(Loc, UO_Deref, Builder.build(S, Loc)).get());
13104 }
13105
13106 DerefBuilder(const ExprBuilder &Builder) : Builder(Builder) {}
13107};
13108
13109class MemberBuilder: public ExprBuilder {
13110 const ExprBuilder &Builder;
13111 QualType Type;
13112 CXXScopeSpec SS;
13113 bool IsArrow;
13114 LookupResult &MemberLookup;
13115
13116public:
13117 Expr *build(Sema &S, SourceLocation Loc) const override {
13118 return assertNotNull(S.BuildMemberReferenceExpr(
13119 Builder.build(S, Loc), Type, Loc, IsArrow, SS, SourceLocation(),
13120 nullptr, MemberLookup, nullptr, nullptr).get());
13121 }
13122
13123 MemberBuilder(const ExprBuilder &Builder, QualType Type, bool IsArrow,
13124 LookupResult &MemberLookup)
13125 : Builder(Builder), Type(Type), IsArrow(IsArrow),
13126 MemberLookup(MemberLookup) {}
13127};
13128
13129class MoveCastBuilder: public ExprBuilder {
13130 const ExprBuilder &Builder;
13131
13132public:
13133 Expr *build(Sema &S, SourceLocation Loc) const override {
13134 return assertNotNull(CastForMoving(S, Builder.build(S, Loc)));
13135 }
13136
13137 MoveCastBuilder(const ExprBuilder &Builder) : Builder(Builder) {}
13138};
13139
13140class LvalueConvBuilder: public ExprBuilder {
13141 const ExprBuilder &Builder;
13142
13143public:
13144 Expr *build(Sema &S, SourceLocation Loc) const override {
13145 return assertNotNull(
13146 S.DefaultLvalueConversion(Builder.build(S, Loc)).get());
13147 }
13148
13149 LvalueConvBuilder(const ExprBuilder &Builder) : Builder(Builder) {}
13150};
13151
13152class SubscriptBuilder: public ExprBuilder {
13153 const ExprBuilder &Base;
13154 const ExprBuilder &Index;
13155
13156public:
13157 Expr *build(Sema &S, SourceLocation Loc) const override {
13158 return assertNotNull(S.CreateBuiltinArraySubscriptExpr(
13159 Base.build(S, Loc), Loc, Index.build(S, Loc), Loc).get());
13160 }
13161
13162 SubscriptBuilder(const ExprBuilder &Base, const ExprBuilder &Index)
13163 : Base(Base), Index(Index) {}
13164};
13165
13166} // end anonymous namespace
13167
13168/// When generating a defaulted copy or move assignment operator, if a field
13169/// should be copied with __builtin_memcpy rather than via explicit assignments,
13170/// do so. This optimization only applies for arrays of scalars, and for arrays
13171/// of class type where the selected copy/move-assignment operator is trivial.
13172static StmtResult
13173buildMemcpyForAssignmentOp(Sema &S, SourceLocation Loc, QualType T,
13174 const ExprBuilder &ToB, const ExprBuilder &FromB) {
13175 // Compute the size of the memory buffer to be copied.
13176 QualType SizeType = S.Context.getSizeType();
13177 llvm::APInt Size(S.Context.getTypeSize(SizeType),
13178 S.Context.getTypeSizeInChars(T).getQuantity());
13179
13180 // Take the address of the field references for "from" and "to". We
13181 // directly construct UnaryOperators here because semantic analysis
13182 // does not permit us to take the address of an xvalue.
13183 Expr *From = FromB.build(S, Loc);
13184 From = new (S.Context) UnaryOperator(From, UO_AddrOf,
13185 S.Context.getPointerType(From->getType()),
13186 VK_RValue, OK_Ordinary, Loc, false);
13187 Expr *To = ToB.build(S, Loc);
13188 To = new (S.Context) UnaryOperator(To, UO_AddrOf,
13189 S.Context.getPointerType(To->getType()),
13190 VK_RValue, OK_Ordinary, Loc, false);
13191
13192 const Type *E = T->getBaseElementTypeUnsafe();
13193 bool NeedsCollectableMemCpy =
13194 E->isRecordType() &&
13195 E->castAs<RecordType>()->getDecl()->hasObjectMember();
13196
13197 // Create a reference to the __builtin_objc_memmove_collectable function
13198 StringRef MemCpyName = NeedsCollectableMemCpy ?
13199 "__builtin_objc_memmove_collectable" :
13200 "__builtin_memcpy";
13201 LookupResult R(S, &S.Context.Idents.get(MemCpyName), Loc,
13202 Sema::LookupOrdinaryName);
13203 S.LookupName(R, S.TUScope, true);
13204
13205 FunctionDecl *MemCpy = R.getAsSingle<FunctionDecl>();
13206 if (!MemCpy)
13207 // Something went horribly wrong earlier, and we will have complained
13208 // about it.
13209 return StmtError();
13210
13211 ExprResult MemCpyRef = S.BuildDeclRefExpr(MemCpy, S.Context.BuiltinFnTy,
13212 VK_RValue, Loc, nullptr);
13213 assert(MemCpyRef.isUsable() && "Builtin reference cannot fail")((MemCpyRef.isUsable() && "Builtin reference cannot fail"
) ? static_cast<void> (0) : __assert_fail ("MemCpyRef.isUsable() && \"Builtin reference cannot fail\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 13213, __PRETTY_FUNCTION__))
;
13214
13215 Expr *CallArgs[] = {
13216 To, From, IntegerLiteral::Create(S.Context, Size, SizeType, Loc)
13217 };
13218 ExprResult Call = S.BuildCallExpr(/*Scope=*/nullptr, MemCpyRef.get(),
13219 Loc, CallArgs, Loc);
13220
13221 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!")((!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"
) ? static_cast<void> (0) : __assert_fail ("!Call.isInvalid() && \"Call to __builtin_memcpy cannot fail!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 13221, __PRETTY_FUNCTION__))
;
13222 return Call.getAs<Stmt>();
13223}
13224
13225/// Builds a statement that copies/moves the given entity from \p From to
13226/// \c To.
13227///
13228/// This routine is used to copy/move the members of a class with an
13229/// implicitly-declared copy/move assignment operator. When the entities being
13230/// copied are arrays, this routine builds for loops to copy them.
13231///
13232/// \param S The Sema object used for type-checking.
13233///
13234/// \param Loc The location where the implicit copy/move is being generated.
13235///
13236/// \param T The type of the expressions being copied/moved. Both expressions
13237/// must have this type.
13238///
13239/// \param To The expression we are copying/moving to.
13240///
13241/// \param From The expression we are copying/moving from.
13242///
13243/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject.
13244/// Otherwise, it's a non-static member subobject.
13245///
13246/// \param Copying Whether we're copying or moving.
13247///
13248/// \param Depth Internal parameter recording the depth of the recursion.
13249///
13250/// \returns A statement or a loop that copies the expressions, or StmtResult(0)
13251/// if a memcpy should be used instead.
13252static StmtResult
13253buildSingleCopyAssignRecursively(Sema &S, SourceLocation Loc, QualType T,
13254 const ExprBuilder &To, const ExprBuilder &From,
13255 bool CopyingBaseSubobject, bool Copying,
13256 unsigned Depth = 0) {
13257 // C++11 [class.copy]p28:
13258 // Each subobject is assigned in the manner appropriate to its type:
13259 //
13260 // - if the subobject is of class type, as if by a call to operator= with
13261 // the subobject as the object expression and the corresponding
13262 // subobject of x as a single function argument (as if by explicit
13263 // qualification; that is, ignoring any possible virtual overriding
13264 // functions in more derived classes);
13265 //
13266 // C++03 [class.copy]p13:
13267 // - if the subobject is of class type, the copy assignment operator for
13268 // the class is used (as if by explicit qualification; that is,
13269 // ignoring any possible virtual overriding functions in more derived
13270 // classes);
13271 if (const RecordType *RecordTy = T->getAs<RecordType>()) {
13272 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl());
13273
13274 // Look for operator=.
13275 DeclarationName Name
13276 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal);
13277 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName);
13278 S.LookupQualifiedName(OpLookup, ClassDecl, false);
13279
13280 // Prior to C++11, filter out any result that isn't a copy/move-assignment
13281 // operator.
13282 if (!S.getLangOpts().CPlusPlus11) {
13283 LookupResult::Filter F = OpLookup.makeFilter();
13284 while (F.hasNext()) {
13285 NamedDecl *D = F.next();
13286 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D))
13287 if (Method->isCopyAssignmentOperator() ||
13288 (!Copying && Method->isMoveAssignmentOperator()))
13289 continue;
13290
13291 F.erase();
13292 }
13293 F.done();
13294 }
13295
13296 // Suppress the protected check (C++ [class.protected]) for each of the
13297 // assignment operators we found. This strange dance is required when
13298 // we're assigning via a base classes's copy-assignment operator. To
13299 // ensure that we're getting the right base class subobject (without
13300 // ambiguities), we need to cast "this" to that subobject type; to
13301 // ensure that we don't go through the virtual call mechanism, we need
13302 // to qualify the operator= name with the base class (see below). However,
13303 // this means that if the base class has a protected copy assignment
13304 // operator, the protected member access check will fail. So, we
13305 // rewrite "protected" access to "public" access in this case, since we
13306 // know by construction that we're calling from a derived class.
13307 if (CopyingBaseSubobject) {
13308 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end();
13309 L != LEnd; ++L) {
13310 if (L.getAccess() == AS_protected)
13311 L.setAccess(AS_public);
13312 }
13313 }
13314
13315 // Create the nested-name-specifier that will be used to qualify the
13316 // reference to operator=; this is required to suppress the virtual
13317 // call mechanism.
13318 CXXScopeSpec SS;
13319 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr());
13320 SS.MakeTrivial(S.Context,
13321 NestedNameSpecifier::Create(S.Context, nullptr, false,
13322 CanonicalT),
13323 Loc);
13324
13325 // Create the reference to operator=.
13326 ExprResult OpEqualRef
13327 = S.BuildMemberReferenceExpr(To.build(S, Loc), T, Loc, /*IsArrow=*/false,
13328 SS, /*TemplateKWLoc=*/SourceLocation(),
13329 /*FirstQualifierInScope=*/nullptr,
13330 OpLookup,
13331 /*TemplateArgs=*/nullptr, /*S*/nullptr,
13332 /*SuppressQualifierCheck=*/true);
13333 if (OpEqualRef.isInvalid())
13334 return StmtError();
13335
13336 // Build the call to the assignment operator.
13337
13338 Expr *FromInst = From.build(S, Loc);
13339 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/nullptr,
13340 OpEqualRef.getAs<Expr>(),
13341 Loc, FromInst, Loc);
13342 if (Call.isInvalid())
13343 return StmtError();
13344
13345 // If we built a call to a trivial 'operator=' while copying an array,
13346 // bail out. We'll replace the whole shebang with a memcpy.
13347 CXXMemberCallExpr *CE = dyn_cast<CXXMemberCallExpr>(Call.get());
13348 if (CE && CE->getMethodDecl()->isTrivial() && Depth)
13349 return StmtResult((Stmt*)nullptr);
13350
13351 // Convert to an expression-statement, and clean up any produced
13352 // temporaries.
13353 return S.ActOnExprStmt(Call);
13354 }
13355
13356 // - if the subobject is of scalar type, the built-in assignment
13357 // operator is used.
13358 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T);
13359 if (!ArrayTy) {
13360 ExprResult Assignment = S.CreateBuiltinBinOp(
13361 Loc, BO_Assign, To.build(S, Loc), From.build(S, Loc));
13362 if (Assignment.isInvalid())
13363 return StmtError();
13364 return S.ActOnExprStmt(Assignment);
13365 }
13366
13367 // - if the subobject is an array, each element is assigned, in the
13368 // manner appropriate to the element type;
13369
13370 // Construct a loop over the array bounds, e.g.,
13371 //
13372 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0)
13373 //
13374 // that will copy each of the array elements.
13375 QualType SizeType = S.Context.getSizeType();
13376
13377 // Create the iteration variable.
13378 IdentifierInfo *IterationVarName = nullptr;
13379 {
13380 SmallString<8> Str;
13381 llvm::raw_svector_ostream OS(Str);
13382 OS << "__i" << Depth;
13383 IterationVarName = &S.Context.Idents.get(OS.str());
13384 }
13385 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc,
13386 IterationVarName, SizeType,
13387 S.Context.getTrivialTypeSourceInfo(SizeType, Loc),
13388 SC_None);
13389
13390 // Initialize the iteration variable to zero.
13391 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0);
13392 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc));
13393
13394 // Creates a reference to the iteration variable.
13395 RefBuilder IterationVarRef(IterationVar, SizeType);
13396 LvalueConvBuilder IterationVarRefRVal(IterationVarRef);
13397
13398 // Create the DeclStmt that holds the iteration variable.
13399 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc);
13400
13401 // Subscript the "from" and "to" expressions with the iteration variable.
13402 SubscriptBuilder FromIndexCopy(From, IterationVarRefRVal);
13403 MoveCastBuilder FromIndexMove(FromIndexCopy);
13404 const ExprBuilder *FromIndex;
13405 if (Copying)
13406 FromIndex = &FromIndexCopy;
13407 else
13408 FromIndex = &FromIndexMove;
13409
13410 SubscriptBuilder ToIndex(To, IterationVarRefRVal);
13411
13412 // Build the copy/move for an individual element of the array.
13413 StmtResult Copy =
13414 buildSingleCopyAssignRecursively(S, Loc, ArrayTy->getElementType(),
13415 ToIndex, *FromIndex, CopyingBaseSubobject,
13416 Copying, Depth + 1);
13417 // Bail out if copying fails or if we determined that we should use memcpy.
13418 if (Copy.isInvalid() || !Copy.get())
13419 return Copy;
13420
13421 // Create the comparison against the array bound.
13422 llvm::APInt Upper
13423 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType));
13424 Expr *Comparison
13425 = new (S.Context) BinaryOperator(IterationVarRefRVal.build(S, Loc),
13426 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc),
13427 BO_NE, S.Context.BoolTy,
13428 VK_RValue, OK_Ordinary, Loc, FPOptions());
13429
13430 // Create the pre-increment of the iteration variable. We can determine
13431 // whether the increment will overflow based on the value of the array
13432 // bound.
13433 Expr *Increment = new (S.Context)
13434 UnaryOperator(IterationVarRef.build(S, Loc), UO_PreInc, SizeType,
13435 VK_LValue, OK_Ordinary, Loc, Upper.isMaxValue());
13436
13437 // Construct the loop that copies all elements of this array.
13438 return S.ActOnForStmt(
13439 Loc, Loc, InitStmt,
13440 S.ActOnCondition(nullptr, Loc, Comparison, Sema::ConditionKind::Boolean),
13441 S.MakeFullDiscardedValueExpr(Increment), Loc, Copy.get());
13442}
13443
13444static StmtResult
13445buildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T,
13446 const ExprBuilder &To, const ExprBuilder &From,
13447 bool CopyingBaseSubobject, bool Copying) {
13448 // Maybe we should use a memcpy?
13449 if (T->isArrayType() && !T.isConstQualified() && !T.isVolatileQualified() &&
13450 T.isTriviallyCopyableType(S.Context))
13451 return buildMemcpyForAssignmentOp(S, Loc, T, To, From);
13452
13453 StmtResult Result(buildSingleCopyAssignRecursively(S, Loc, T, To, From,
13454 CopyingBaseSubobject,
13455 Copying, 0));
13456
13457 // If we ended up picking a trivial assignment operator for an array of a
13458 // non-trivially-copyable class type, just emit a memcpy.
13459 if (!Result.isInvalid() && !Result.get())
13460 return buildMemcpyForAssignmentOp(S, Loc, T, To, From);
13461
13462 return Result;
13463}
13464
13465CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) {
13466 // Note: The following rules are largely analoguous to the copy
13467 // constructor rules. Note that virtual bases are not taken into account
13468 // for determining the argument type of the operator. Note also that
13469 // operators taking an object instead of a reference are allowed.
13470 assert(ClassDecl->needsImplicitCopyAssignment())((ClassDecl->needsImplicitCopyAssignment()) ? static_cast<
void> (0) : __assert_fail ("ClassDecl->needsImplicitCopyAssignment()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 13470, __PRETTY_FUNCTION__))
;
13471
13472 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyAssignment);
13473 if (DSM.isAlreadyBeingDeclared())
13474 return nullptr;
13475
13476 QualType ArgType = Context.getTypeDeclType(ClassDecl);
13477 LangAS AS = getDefaultCXXMethodAddrSpace();
13478 if (AS != LangAS::Default)
13479 ArgType = Context.getAddrSpaceQualType(ArgType, AS);
13480 QualType RetType = Context.getLValueReferenceType(ArgType);
13481 bool Const = ClassDecl->implicitCopyAssignmentHasConstParam();
13482 if (Const)
13483 ArgType = ArgType.withConst();
13484
13485 ArgType = Context.getLValueReferenceType(ArgType);
13486
13487 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
13488 CXXCopyAssignment,
13489 Const);
13490
13491 // An implicitly-declared copy assignment operator is an inline public
13492 // member of its class.
13493 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal);
13494 SourceLocation ClassLoc = ClassDecl->getLocation();
13495 DeclarationNameInfo NameInfo(Name, ClassLoc);
13496 CXXMethodDecl *CopyAssignment = CXXMethodDecl::Create(
13497 Context, ClassDecl, ClassLoc, NameInfo, QualType(),
13498 /*TInfo=*/nullptr, /*StorageClass=*/SC_None,
13499 /*isInline=*/true, Constexpr ? CSK_constexpr : CSK_unspecified,
13500 SourceLocation());
13501 CopyAssignment->setAccess(AS_public);
13502 CopyAssignment->setDefaulted();
13503 CopyAssignment->setImplicit();
13504
13505 if (getLangOpts().CUDA) {
13506 inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXCopyAssignment,
13507 CopyAssignment,
13508 /* ConstRHS */ Const,
13509 /* Diagnose */ false);
13510 }
13511
13512 setupImplicitSpecialMemberType(CopyAssignment, RetType, ArgType);
13513
13514 // Add the parameter to the operator.
13515 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment,
13516 ClassLoc, ClassLoc,
13517 /*Id=*/nullptr, ArgType,
13518 /*TInfo=*/nullptr, SC_None,
13519 nullptr);
13520 CopyAssignment->setParams(FromParam);
13521
13522 CopyAssignment->setTrivial(
13523 ClassDecl->needsOverloadResolutionForCopyAssignment()
13524 ? SpecialMemberIsTrivial(CopyAssignment, CXXCopyAssignment)
13525 : ClassDecl->hasTrivialCopyAssignment());
13526
13527 // Note that we have added this copy-assignment operator.
13528 ++getASTContext().NumImplicitCopyAssignmentOperatorsDeclared;
13529
13530 Scope *S = getScopeForContext(ClassDecl);
13531 CheckImplicitSpecialMemberDeclaration(S, CopyAssignment);
13532
13533 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment))
13534 SetDeclDeleted(CopyAssignment, ClassLoc);
13535
13536 if (S)
13537 PushOnScopeChains(CopyAssignment, S, false);
13538 ClassDecl->addDecl(CopyAssignment);
13539
13540 return CopyAssignment;
13541}
13542
13543/// Diagnose an implicit copy operation for a class which is odr-used, but
13544/// which is deprecated because the class has a user-declared copy constructor,
13545/// copy assignment operator, or destructor.
13546static void diagnoseDeprecatedCopyOperation(Sema &S, CXXMethodDecl *CopyOp) {
13547 assert(CopyOp->isImplicit())((CopyOp->isImplicit()) ? static_cast<void> (0) : __assert_fail
("CopyOp->isImplicit()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 13547, __PRETTY_FUNCTION__))
;
13548
13549 CXXRecordDecl *RD = CopyOp->getParent();
13550 CXXMethodDecl *UserDeclaredOperation = nullptr;
13551
13552 // In Microsoft mode, assignment operations don't affect constructors and
13553 // vice versa.
13554 if (RD->hasUserDeclaredDestructor()) {
13555 UserDeclaredOperation = RD->getDestructor();
13556 } else if (!isa<CXXConstructorDecl>(CopyOp) &&
13557 RD->hasUserDeclaredCopyConstructor() &&
13558 !S.getLangOpts().MSVCCompat) {
13559 // Find any user-declared copy constructor.
13560 for (auto *I : RD->ctors()) {
13561 if (I->isCopyConstructor()) {
13562 UserDeclaredOperation = I;
13563 break;
13564 }
13565 }
13566 assert(UserDeclaredOperation)((UserDeclaredOperation) ? static_cast<void> (0) : __assert_fail
("UserDeclaredOperation", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 13566, __PRETTY_FUNCTION__))
;
13567 } else if (isa<CXXConstructorDecl>(CopyOp) &&
13568 RD->hasUserDeclaredCopyAssignment() &&
13569 !S.getLangOpts().MSVCCompat) {
13570 // Find any user-declared move assignment operator.
13571 for (auto *I : RD->methods()) {
13572 if (I->isCopyAssignmentOperator()) {
13573 UserDeclaredOperation = I;
13574 break;
13575 }
13576 }
13577 assert(UserDeclaredOperation)((UserDeclaredOperation) ? static_cast<void> (0) : __assert_fail
("UserDeclaredOperation", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 13577, __PRETTY_FUNCTION__))
;
13578 }
13579
13580 if (UserDeclaredOperation && UserDeclaredOperation->isUserProvided()) {
13581 S.Diag(UserDeclaredOperation->getLocation(),
13582 isa<CXXDestructorDecl>(UserDeclaredOperation)
13583 ? diag::warn_deprecated_copy_dtor_operation
13584 : diag::warn_deprecated_copy_operation)
13585 << RD << /*copy assignment*/ !isa<CXXConstructorDecl>(CopyOp);
13586 }
13587}
13588
13589void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation,
13590 CXXMethodDecl *CopyAssignOperator) {
13591 assert((CopyAssignOperator->isDefaulted() &&(((CopyAssignOperator->isDefaulted() && CopyAssignOperator
->isOverloadedOperator() && CopyAssignOperator->
getOverloadedOperator() == OO_Equal && !CopyAssignOperator
->doesThisDeclarationHaveABody() && !CopyAssignOperator
->isDeleted()) && "DefineImplicitCopyAssignment called for wrong function"
) ? static_cast<void> (0) : __assert_fail ("(CopyAssignOperator->isDefaulted() && CopyAssignOperator->isOverloadedOperator() && CopyAssignOperator->getOverloadedOperator() == OO_Equal && !CopyAssignOperator->doesThisDeclarationHaveABody() && !CopyAssignOperator->isDeleted()) && \"DefineImplicitCopyAssignment called for wrong function\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 13596, __PRETTY_FUNCTION__))
13592 CopyAssignOperator->isOverloadedOperator() &&(((CopyAssignOperator->isDefaulted() && CopyAssignOperator
->isOverloadedOperator() && CopyAssignOperator->
getOverloadedOperator() == OO_Equal && !CopyAssignOperator
->doesThisDeclarationHaveABody() && !CopyAssignOperator
->isDeleted()) && "DefineImplicitCopyAssignment called for wrong function"
) ? static_cast<void> (0) : __assert_fail ("(CopyAssignOperator->isDefaulted() && CopyAssignOperator->isOverloadedOperator() && CopyAssignOperator->getOverloadedOperator() == OO_Equal && !CopyAssignOperator->doesThisDeclarationHaveABody() && !CopyAssignOperator->isDeleted()) && \"DefineImplicitCopyAssignment called for wrong function\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 13596, __PRETTY_FUNCTION__))
13593 CopyAssignOperator->getOverloadedOperator() == OO_Equal &&(((CopyAssignOperator->isDefaulted() && CopyAssignOperator
->isOverloadedOperator() && CopyAssignOperator->
getOverloadedOperator() == OO_Equal && !CopyAssignOperator
->doesThisDeclarationHaveABody() && !CopyAssignOperator
->isDeleted()) && "DefineImplicitCopyAssignment called for wrong function"
) ? static_cast<void> (0) : __assert_fail ("(CopyAssignOperator->isDefaulted() && CopyAssignOperator->isOverloadedOperator() && CopyAssignOperator->getOverloadedOperator() == OO_Equal && !CopyAssignOperator->doesThisDeclarationHaveABody() && !CopyAssignOperator->isDeleted()) && \"DefineImplicitCopyAssignment called for wrong function\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 13596, __PRETTY_FUNCTION__))
13594 !CopyAssignOperator->doesThisDeclarationHaveABody() &&(((CopyAssignOperator->isDefaulted() && CopyAssignOperator
->isOverloadedOperator() && CopyAssignOperator->
getOverloadedOperator() == OO_Equal && !CopyAssignOperator
->doesThisDeclarationHaveABody() && !CopyAssignOperator
->isDeleted()) && "DefineImplicitCopyAssignment called for wrong function"
) ? static_cast<void> (0) : __assert_fail ("(CopyAssignOperator->isDefaulted() && CopyAssignOperator->isOverloadedOperator() && CopyAssignOperator->getOverloadedOperator() == OO_Equal && !CopyAssignOperator->doesThisDeclarationHaveABody() && !CopyAssignOperator->isDeleted()) && \"DefineImplicitCopyAssignment called for wrong function\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 13596, __PRETTY_FUNCTION__))
13595 !CopyAssignOperator->isDeleted()) &&(((CopyAssignOperator->isDefaulted() && CopyAssignOperator
->isOverloadedOperator() && CopyAssignOperator->
getOverloadedOperator() == OO_Equal && !CopyAssignOperator
->doesThisDeclarationHaveABody() && !CopyAssignOperator
->isDeleted()) && "DefineImplicitCopyAssignment called for wrong function"
) ? static_cast<void> (0) : __assert_fail ("(CopyAssignOperator->isDefaulted() && CopyAssignOperator->isOverloadedOperator() && CopyAssignOperator->getOverloadedOperator() == OO_Equal && !CopyAssignOperator->doesThisDeclarationHaveABody() && !CopyAssignOperator->isDeleted()) && \"DefineImplicitCopyAssignment called for wrong function\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 13596, __PRETTY_FUNCTION__))
13596 "DefineImplicitCopyAssignment called for wrong function")(((CopyAssignOperator->isDefaulted() && CopyAssignOperator
->isOverloadedOperator() && CopyAssignOperator->
getOverloadedOperator() == OO_Equal && !CopyAssignOperator
->doesThisDeclarationHaveABody() && !CopyAssignOperator
->isDeleted()) && "DefineImplicitCopyAssignment called for wrong function"
) ? static_cast<void> (0) : __assert_fail ("(CopyAssignOperator->isDefaulted() && CopyAssignOperator->isOverloadedOperator() && CopyAssignOperator->getOverloadedOperator() == OO_Equal && !CopyAssignOperator->doesThisDeclarationHaveABody() && !CopyAssignOperator->isDeleted()) && \"DefineImplicitCopyAssignment called for wrong function\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 13596, __PRETTY_FUNCTION__))
;
13597 if (CopyAssignOperator->willHaveBody() || CopyAssignOperator->isInvalidDecl())
13598 return;
13599
13600 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent();
13601 if (ClassDecl->isInvalidDecl()) {
13602 CopyAssignOperator->setInvalidDecl();
13603 return;
13604 }
13605
13606 SynthesizedFunctionScope Scope(*this, CopyAssignOperator);
13607
13608 // The exception specification is needed because we are defining the
13609 // function.
13610 ResolveExceptionSpec(CurrentLocation,
13611 CopyAssignOperator->getType()->castAs<FunctionProtoType>());
13612
13613 // Add a context note for diagnostics produced after this point.
13614 Scope.addContextNote(CurrentLocation);
13615
13616 // C++11 [class.copy]p18:
13617 // The [definition of an implicitly declared copy assignment operator] is
13618 // deprecated if the class has a user-declared copy constructor or a
13619 // user-declared destructor.
13620 if (getLangOpts().CPlusPlus11 && CopyAssignOperator->isImplicit())
13621 diagnoseDeprecatedCopyOperation(*this, CopyAssignOperator);
13622
13623 // C++0x [class.copy]p30:
13624 // The implicitly-defined or explicitly-defaulted copy assignment operator
13625 // for a non-union class X performs memberwise copy assignment of its
13626 // subobjects. The direct base classes of X are assigned first, in the
13627 // order of their declaration in the base-specifier-list, and then the
13628 // immediate non-static data members of X are assigned, in the order in
13629 // which they were declared in the class definition.
13630
13631 // The statements that form the synthesized function body.
13632 SmallVector<Stmt*, 8> Statements;
13633
13634 // The parameter for the "other" object, which we are copying from.
13635 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0);
13636 Qualifiers OtherQuals = Other->getType().getQualifiers();
13637 QualType OtherRefType = Other->getType();
13638 if (const LValueReferenceType *OtherRef
13639 = OtherRefType->getAs<LValueReferenceType>()) {
13640 OtherRefType = OtherRef->getPointeeType();
13641 OtherQuals = OtherRefType.getQualifiers();
13642 }
13643
13644 // Our location for everything implicitly-generated.
13645 SourceLocation Loc = CopyAssignOperator->getEndLoc().isValid()
13646 ? CopyAssignOperator->getEndLoc()
13647 : CopyAssignOperator->getLocation();
13648
13649 // Builds a DeclRefExpr for the "other" object.
13650 RefBuilder OtherRef(Other, OtherRefType);
13651
13652 // Builds the "this" pointer.
13653 ThisBuilder This;
13654
13655 // Assign base classes.
13656 bool Invalid = false;
13657 for (auto &Base : ClassDecl->bases()) {
13658 // Form the assignment:
13659 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other));
13660 QualType BaseType = Base.getType().getUnqualifiedType();
13661 if (!BaseType->isRecordType()) {
13662 Invalid = true;
13663 continue;
13664 }
13665
13666 CXXCastPath BasePath;
13667 BasePath.push_back(&Base);
13668
13669 // Construct the "from" expression, which is an implicit cast to the
13670 // appropriately-qualified base type.
13671 CastBuilder From(OtherRef, Context.getQualifiedType(BaseType, OtherQuals),
13672 VK_LValue, BasePath);
13673
13674 // Dereference "this".
13675 DerefBuilder DerefThis(This);
13676 CastBuilder To(DerefThis,
13677 Context.getQualifiedType(
13678 BaseType, CopyAssignOperator->getMethodQualifiers()),
13679 VK_LValue, BasePath);
13680
13681 // Build the copy.
13682 StmtResult Copy = buildSingleCopyAssign(*this, Loc, BaseType,
13683 To, From,
13684 /*CopyingBaseSubobject=*/true,
13685 /*Copying=*/true);
13686 if (Copy.isInvalid()) {
13687 CopyAssignOperator->setInvalidDecl();
13688 return;
13689 }
13690
13691 // Success! Record the copy.
13692 Statements.push_back(Copy.getAs<Expr>());
13693 }
13694
13695 // Assign non-static members.
13696 for (auto *Field : ClassDecl->fields()) {
13697 // FIXME: We should form some kind of AST representation for the implied
13698 // memcpy in a union copy operation.
13699 if (Field->isUnnamedBitfield() || Field->getParent()->isUnion())
13700 continue;
13701
13702 if (Field->isInvalidDecl()) {
13703 Invalid = true;
13704 continue;
13705 }
13706
13707 // Check for members of reference type; we can't copy those.
13708 if (Field->getType()->isReferenceType()) {
13709 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
13710 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName();
13711 Diag(Field->getLocation(), diag::note_declared_at);
13712 Invalid = true;
13713 continue;
13714 }
13715
13716 // Check for members of const-qualified, non-class type.
13717 QualType BaseType = Context.getBaseElementType(Field->getType());
13718 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) {
13719 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
13720 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName();
13721 Diag(Field->getLocation(), diag::note_declared_at);
13722 Invalid = true;
13723 continue;
13724 }
13725
13726 // Suppress assigning zero-width bitfields.
13727 if (Field->isZeroLengthBitField(Context))
13728 continue;
13729
13730 QualType FieldType = Field->getType().getNonReferenceType();
13731 if (FieldType->isIncompleteArrayType()) {
13732 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\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 13733, __PRETTY_FUNCTION__))
13733 "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\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 13733, __PRETTY_FUNCTION__))
;
13734 continue;
13735 }
13736
13737 // Build references to the field in the object we're copying from and to.
13738 CXXScopeSpec SS; // Intentionally empty
13739 LookupResult MemberLookup(*this, Field->getDeclName(), Loc,
13740 LookupMemberName);
13741 MemberLookup.addDecl(Field);
13742 MemberLookup.resolveKind();
13743
13744 MemberBuilder From(OtherRef, OtherRefType, /*IsArrow=*/false, MemberLookup);
13745
13746 MemberBuilder To(This, getCurrentThisType(), /*IsArrow=*/true, MemberLookup);
13747
13748 // Build the copy of this field.
13749 StmtResult Copy = buildSingleCopyAssign(*this, Loc, FieldType,
13750 To, From,
13751 /*CopyingBaseSubobject=*/false,
13752 /*Copying=*/true);
13753 if (Copy.isInvalid()) {
13754 CopyAssignOperator->setInvalidDecl();
13755 return;
13756 }
13757
13758 // Success! Record the copy.
13759 Statements.push_back(Copy.getAs<Stmt>());
13760 }
13761
13762 if (!Invalid) {
13763 // Add a "return *this;"
13764 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This.build(*this, Loc));
13765
13766 StmtResult Return = BuildReturnStmt(Loc, ThisObj.get());
13767 if (Return.isInvalid())
13768 Invalid = true;
13769 else
13770 Statements.push_back(Return.getAs<Stmt>());
13771 }
13772
13773 if (Invalid) {
13774 CopyAssignOperator->setInvalidDecl();
13775 return;
13776 }
13777
13778 StmtResult Body;
13779 {
13780 CompoundScopeRAII CompoundScope(*this);
13781 Body = ActOnCompoundStmt(Loc, Loc, Statements,
13782 /*isStmtExpr=*/false);
13783 assert(!Body.isInvalid() && "Compound statement creation cannot fail")((!Body.isInvalid() && "Compound statement creation cannot fail"
) ? static_cast<void> (0) : __assert_fail ("!Body.isInvalid() && \"Compound statement creation cannot fail\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 13783, __PRETTY_FUNCTION__))
;
13784 }
13785 CopyAssignOperator->setBody(Body.getAs<Stmt>());
13786 CopyAssignOperator->markUsed(Context);
13787
13788 if (ASTMutationListener *L = getASTMutationListener()) {
13789 L->CompletedImplicitDefinition(CopyAssignOperator);
13790 }
13791}
13792
13793CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) {
13794 assert(ClassDecl->needsImplicitMoveAssignment())((ClassDecl->needsImplicitMoveAssignment()) ? static_cast<
void> (0) : __assert_fail ("ClassDecl->needsImplicitMoveAssignment()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 13794, __PRETTY_FUNCTION__))
;
13795
13796 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveAssignment);
13797 if (DSM.isAlreadyBeingDeclared())
13798 return nullptr;
13799
13800 // Note: The following rules are largely analoguous to the move
13801 // constructor rules.
13802
13803 QualType ArgType = Context.getTypeDeclType(ClassDecl);
13804 LangAS AS = getDefaultCXXMethodAddrSpace();
13805 if (AS != LangAS::Default)
13806 ArgType = Context.getAddrSpaceQualType(ArgType, AS);
13807 QualType RetType = Context.getLValueReferenceType(ArgType);
13808 ArgType = Context.getRValueReferenceType(ArgType);
13809
13810 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
13811 CXXMoveAssignment,
13812 false);
13813
13814 // An implicitly-declared move assignment operator is an inline public
13815 // member of its class.
13816 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal);
13817 SourceLocation ClassLoc = ClassDecl->getLocation();
13818 DeclarationNameInfo NameInfo(Name, ClassLoc);
13819 CXXMethodDecl *MoveAssignment = CXXMethodDecl::Create(
13820 Context, ClassDecl, ClassLoc, NameInfo, QualType(),
13821 /*TInfo=*/nullptr, /*StorageClass=*/SC_None,
13822 /*isInline=*/true, Constexpr ? CSK_constexpr : CSK_unspecified,
13823 SourceLocation());
13824 MoveAssignment->setAccess(AS_public);
13825 MoveAssignment->setDefaulted();
13826 MoveAssignment->setImplicit();
13827
13828 if (getLangOpts().CUDA) {
13829 inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXMoveAssignment,
13830 MoveAssignment,
13831 /* ConstRHS */ false,
13832 /* Diagnose */ false);
13833 }
13834
13835 // Build an exception specification pointing back at this member.
13836 FunctionProtoType::ExtProtoInfo EPI =
13837 getImplicitMethodEPI(*this, MoveAssignment);
13838 MoveAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI));
13839
13840 // Add the parameter to the operator.
13841 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment,
13842 ClassLoc, ClassLoc,
13843 /*Id=*/nullptr, ArgType,
13844 /*TInfo=*/nullptr, SC_None,
13845 nullptr);
13846 MoveAssignment->setParams(FromParam);
13847
13848 MoveAssignment->setTrivial(
13849 ClassDecl->needsOverloadResolutionForMoveAssignment()
13850 ? SpecialMemberIsTrivial(MoveAssignment, CXXMoveAssignment)
13851 : ClassDecl->hasTrivialMoveAssignment());
13852
13853 // Note that we have added this copy-assignment operator.
13854 ++getASTContext().NumImplicitMoveAssignmentOperatorsDeclared;
13855
13856 Scope *S = getScopeForContext(ClassDecl);
13857 CheckImplicitSpecialMemberDeclaration(S, MoveAssignment);
13858
13859 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) {
13860 ClassDecl->setImplicitMoveAssignmentIsDeleted();
13861 SetDeclDeleted(MoveAssignment, ClassLoc);
13862 }
13863
13864 if (S)
13865 PushOnScopeChains(MoveAssignment, S, false);
13866 ClassDecl->addDecl(MoveAssignment);
13867
13868 return MoveAssignment;
13869}
13870
13871/// Check if we're implicitly defining a move assignment operator for a class
13872/// with virtual bases. Such a move assignment might move-assign the virtual
13873/// base multiple times.
13874static void checkMoveAssignmentForRepeatedMove(Sema &S, CXXRecordDecl *Class,
13875 SourceLocation CurrentLocation) {
13876 assert(!Class->isDependentContext() && "should not define dependent move")((!Class->isDependentContext() && "should not define dependent move"
) ? static_cast<void> (0) : __assert_fail ("!Class->isDependentContext() && \"should not define dependent move\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 13876, __PRETTY_FUNCTION__))
;
13877
13878 // Only a virtual base could get implicitly move-assigned multiple times.
13879 // Only a non-trivial move assignment can observe this. We only want to
13880 // diagnose if we implicitly define an assignment operator that assigns
13881 // two base classes, both of which move-assign the same virtual base.
13882 if (Class->getNumVBases() == 0 || Class->hasTrivialMoveAssignment() ||
13883 Class->getNumBases() < 2)
13884 return;
13885
13886 llvm::SmallVector<CXXBaseSpecifier *, 16> Worklist;
13887 typedef llvm::DenseMap<CXXRecordDecl*, CXXBaseSpecifier*> VBaseMap;
13888 VBaseMap VBases;
13889
13890 for (auto &BI : Class->bases()) {
13891 Worklist.push_back(&BI);
13892 while (!Worklist.empty()) {
13893 CXXBaseSpecifier *BaseSpec = Worklist.pop_back_val();
13894 CXXRecordDecl *Base = BaseSpec->getType()->getAsCXXRecordDecl();
13895
13896 // If the base has no non-trivial move assignment operators,
13897 // we don't care about moves from it.
13898 if (!Base->hasNonTrivialMoveAssignment())
13899 continue;
13900
13901 // If there's nothing virtual here, skip it.
13902 if (!BaseSpec->isVirtual() && !Base->getNumVBases())
13903 continue;
13904
13905 // If we're not actually going to call a move assignment for this base,
13906 // or the selected move assignment is trivial, skip it.
13907 Sema::SpecialMemberOverloadResult SMOR =
13908 S.LookupSpecialMember(Base, Sema::CXXMoveAssignment,
13909 /*ConstArg*/false, /*VolatileArg*/false,
13910 /*RValueThis*/true, /*ConstThis*/false,
13911 /*VolatileThis*/false);
13912 if (!SMOR.getMethod() || SMOR.getMethod()->isTrivial() ||
13913 !SMOR.getMethod()->isMoveAssignmentOperator())
13914 continue;
13915
13916 if (BaseSpec->isVirtual()) {
13917 // We're going to move-assign this virtual base, and its move
13918 // assignment operator is not trivial. If this can happen for
13919 // multiple distinct direct bases of Class, diagnose it. (If it
13920 // only happens in one base, we'll diagnose it when synthesizing
13921 // that base class's move assignment operator.)
13922 CXXBaseSpecifier *&Existing =
13923 VBases.insert(std::make_pair(Base->getCanonicalDecl(), &BI))
13924 .first->second;
13925 if (Existing && Existing != &BI) {
13926 S.Diag(CurrentLocation, diag::warn_vbase_moved_multiple_times)
13927 << Class << Base;
13928 S.Diag(Existing->getBeginLoc(), diag::note_vbase_moved_here)
13929 << (Base->getCanonicalDecl() ==
13930 Existing->getType()->getAsCXXRecordDecl()->getCanonicalDecl())
13931 << Base << Existing->getType() << Existing->getSourceRange();
13932 S.Diag(BI.getBeginLoc(), diag::note_vbase_moved_here)
13933 << (Base->getCanonicalDecl() ==
13934 BI.getType()->getAsCXXRecordDecl()->getCanonicalDecl())
13935 << Base << BI.getType() << BaseSpec->getSourceRange();
13936
13937 // Only diagnose each vbase once.
13938 Existing = nullptr;
13939 }
13940 } else {
13941 // Only walk over bases that have defaulted move assignment operators.
13942 // We assume that any user-provided move assignment operator handles
13943 // the multiple-moves-of-vbase case itself somehow.
13944 if (!SMOR.getMethod()->isDefaulted())
13945 continue;
13946
13947 // We're going to move the base classes of Base. Add them to the list.
13948 for (auto &BI : Base->bases())
13949 Worklist.push_back(&BI);
13950 }
13951 }
13952 }
13953}
13954
13955void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation,
13956 CXXMethodDecl *MoveAssignOperator) {
13957 assert((MoveAssignOperator->isDefaulted() &&(((MoveAssignOperator->isDefaulted() && MoveAssignOperator
->isOverloadedOperator() && MoveAssignOperator->
getOverloadedOperator() == OO_Equal && !MoveAssignOperator
->doesThisDeclarationHaveABody() && !MoveAssignOperator
->isDeleted()) && "DefineImplicitMoveAssignment called for wrong function"
) ? static_cast<void> (0) : __assert_fail ("(MoveAssignOperator->isDefaulted() && MoveAssignOperator->isOverloadedOperator() && MoveAssignOperator->getOverloadedOperator() == OO_Equal && !MoveAssignOperator->doesThisDeclarationHaveABody() && !MoveAssignOperator->isDeleted()) && \"DefineImplicitMoveAssignment called for wrong function\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 13962, __PRETTY_FUNCTION__))
13958 MoveAssignOperator->isOverloadedOperator() &&(((MoveAssignOperator->isDefaulted() && MoveAssignOperator
->isOverloadedOperator() && MoveAssignOperator->
getOverloadedOperator() == OO_Equal && !MoveAssignOperator
->doesThisDeclarationHaveABody() && !MoveAssignOperator
->isDeleted()) && "DefineImplicitMoveAssignment called for wrong function"
) ? static_cast<void> (0) : __assert_fail ("(MoveAssignOperator->isDefaulted() && MoveAssignOperator->isOverloadedOperator() && MoveAssignOperator->getOverloadedOperator() == OO_Equal && !MoveAssignOperator->doesThisDeclarationHaveABody() && !MoveAssignOperator->isDeleted()) && \"DefineImplicitMoveAssignment called for wrong function\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 13962, __PRETTY_FUNCTION__))
13959 MoveAssignOperator->getOverloadedOperator() == OO_Equal &&(((MoveAssignOperator->isDefaulted() && MoveAssignOperator
->isOverloadedOperator() && MoveAssignOperator->
getOverloadedOperator() == OO_Equal && !MoveAssignOperator
->doesThisDeclarationHaveABody() && !MoveAssignOperator
->isDeleted()) && "DefineImplicitMoveAssignment called for wrong function"
) ? static_cast<void> (0) : __assert_fail ("(MoveAssignOperator->isDefaulted() && MoveAssignOperator->isOverloadedOperator() && MoveAssignOperator->getOverloadedOperator() == OO_Equal && !MoveAssignOperator->doesThisDeclarationHaveABody() && !MoveAssignOperator->isDeleted()) && \"DefineImplicitMoveAssignment called for wrong function\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 13962, __PRETTY_FUNCTION__))
13960 !MoveAssignOperator->doesThisDeclarationHaveABody() &&(((MoveAssignOperator->isDefaulted() && MoveAssignOperator
->isOverloadedOperator() && MoveAssignOperator->
getOverloadedOperator() == OO_Equal && !MoveAssignOperator
->doesThisDeclarationHaveABody() && !MoveAssignOperator
->isDeleted()) && "DefineImplicitMoveAssignment called for wrong function"
) ? static_cast<void> (0) : __assert_fail ("(MoveAssignOperator->isDefaulted() && MoveAssignOperator->isOverloadedOperator() && MoveAssignOperator->getOverloadedOperator() == OO_Equal && !MoveAssignOperator->doesThisDeclarationHaveABody() && !MoveAssignOperator->isDeleted()) && \"DefineImplicitMoveAssignment called for wrong function\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 13962, __PRETTY_FUNCTION__))
13961 !MoveAssignOperator->isDeleted()) &&(((MoveAssignOperator->isDefaulted() && MoveAssignOperator
->isOverloadedOperator() && MoveAssignOperator->
getOverloadedOperator() == OO_Equal && !MoveAssignOperator
->doesThisDeclarationHaveABody() && !MoveAssignOperator
->isDeleted()) && "DefineImplicitMoveAssignment called for wrong function"
) ? static_cast<void> (0) : __assert_fail ("(MoveAssignOperator->isDefaulted() && MoveAssignOperator->isOverloadedOperator() && MoveAssignOperator->getOverloadedOperator() == OO_Equal && !MoveAssignOperator->doesThisDeclarationHaveABody() && !MoveAssignOperator->isDeleted()) && \"DefineImplicitMoveAssignment called for wrong function\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 13962, __PRETTY_FUNCTION__))
13962 "DefineImplicitMoveAssignment called for wrong function")(((MoveAssignOperator->isDefaulted() && MoveAssignOperator
->isOverloadedOperator() && MoveAssignOperator->
getOverloadedOperator() == OO_Equal && !MoveAssignOperator
->doesThisDeclarationHaveABody() && !MoveAssignOperator
->isDeleted()) && "DefineImplicitMoveAssignment called for wrong function"
) ? static_cast<void> (0) : __assert_fail ("(MoveAssignOperator->isDefaulted() && MoveAssignOperator->isOverloadedOperator() && MoveAssignOperator->getOverloadedOperator() == OO_Equal && !MoveAssignOperator->doesThisDeclarationHaveABody() && !MoveAssignOperator->isDeleted()) && \"DefineImplicitMoveAssignment called for wrong function\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 13962, __PRETTY_FUNCTION__))
;
13963 if (MoveAssignOperator->willHaveBody() || MoveAssignOperator->isInvalidDecl())
13964 return;
13965
13966 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent();
13967 if (ClassDecl->isInvalidDecl()) {
13968 MoveAssignOperator->setInvalidDecl();
13969 return;
13970 }
13971
13972 // C++0x [class.copy]p28:
13973 // The implicitly-defined or move assignment operator for a non-union class
13974 // X performs memberwise move assignment of its subobjects. The direct base
13975 // classes of X are assigned first, in the order of their declaration in the
13976 // base-specifier-list, and then the immediate non-static data members of X
13977 // are assigned, in the order in which they were declared in the class
13978 // definition.
13979
13980 // Issue a warning if our implicit move assignment operator will move
13981 // from a virtual base more than once.
13982 checkMoveAssignmentForRepeatedMove(*this, ClassDecl, CurrentLocation);
13983
13984 SynthesizedFunctionScope Scope(*this, MoveAssignOperator);
13985
13986 // The exception specification is needed because we are defining the
13987 // function.
13988 ResolveExceptionSpec(CurrentLocation,
13989 MoveAssignOperator->getType()->castAs<FunctionProtoType>());
13990
13991 // Add a context note for diagnostics produced after this point.
13992 Scope.addContextNote(CurrentLocation);
13993
13994 // The statements that form the synthesized function body.
13995 SmallVector<Stmt*, 8> Statements;
13996
13997 // The parameter for the "other" object, which we are move from.
13998 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0);
13999 QualType OtherRefType = Other->getType()->
14000 getAs<RValueReferenceType>()->getPointeeType();
14001
14002 // Our location for everything implicitly-generated.
14003 SourceLocation Loc = MoveAssignOperator->getEndLoc().isValid()
14004 ? MoveAssignOperator->getEndLoc()
14005 : MoveAssignOperator->getLocation();
14006
14007 // Builds a reference to the "other" object.
14008 RefBuilder OtherRef(Other, OtherRefType);
14009 // Cast to rvalue.
14010 MoveCastBuilder MoveOther(OtherRef);
14011
14012 // Builds the "this" pointer.
14013 ThisBuilder This;
14014
14015 // Assign base classes.
14016 bool Invalid = false;
14017 for (auto &Base : ClassDecl->bases()) {
14018 // C++11 [class.copy]p28:
14019 // It is unspecified whether subobjects representing virtual base classes
14020 // are assigned more than once by the implicitly-defined copy assignment
14021 // operator.
14022 // FIXME: Do not assign to a vbase that will be assigned by some other base
14023 // class. For a move-assignment, this can result in the vbase being moved
14024 // multiple times.
14025
14026 // Form the assignment:
14027 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other));
14028 QualType BaseType = Base.getType().getUnqualifiedType();
14029 if (!BaseType->isRecordType()) {
14030 Invalid = true;
14031 continue;
14032 }
14033
14034 CXXCastPath BasePath;
14035 BasePath.push_back(&Base);
14036
14037 // Construct the "from" expression, which is an implicit cast to the
14038 // appropriately-qualified base type.
14039 CastBuilder From(OtherRef, BaseType, VK_XValue, BasePath);
14040
14041 // Dereference "this".
14042 DerefBuilder DerefThis(This);
14043
14044 // Implicitly cast "this" to the appropriately-qualified base type.
14045 CastBuilder To(DerefThis,
14046 Context.getQualifiedType(
14047 BaseType, MoveAssignOperator->getMethodQualifiers()),
14048 VK_LValue, BasePath);
14049
14050 // Build the move.
14051 StmtResult Move = buildSingleCopyAssign(*this, Loc, BaseType,
14052 To, From,
14053 /*CopyingBaseSubobject=*/true,
14054 /*Copying=*/false);
14055 if (Move.isInvalid()) {
14056 MoveAssignOperator->setInvalidDecl();
14057 return;
14058 }
14059
14060 // Success! Record the move.
14061 Statements.push_back(Move.getAs<Expr>());
14062 }
14063
14064 // Assign non-static members.
14065 for (auto *Field : ClassDecl->fields()) {
14066 // FIXME: We should form some kind of AST representation for the implied
14067 // memcpy in a union copy operation.
14068 if (Field->isUnnamedBitfield() || Field->getParent()->isUnion())
14069 continue;
14070
14071 if (Field->isInvalidDecl()) {
14072 Invalid = true;
14073 continue;
14074 }
14075
14076 // Check for members of reference type; we can't move those.
14077 if (Field->getType()->isReferenceType()) {
14078 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
14079 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName();
14080 Diag(Field->getLocation(), diag::note_declared_at);
14081 Invalid = true;
14082 continue;
14083 }
14084
14085 // Check for members of const-qualified, non-class type.
14086 QualType BaseType = Context.getBaseElementType(Field->getType());
14087 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) {
14088 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
14089 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName();
14090 Diag(Field->getLocation(), diag::note_declared_at);
14091 Invalid = true;
14092 continue;
14093 }
14094
14095 // Suppress assigning zero-width bitfields.
14096 if (Field->isZeroLengthBitField(Context))
14097 continue;
14098
14099 QualType FieldType = Field->getType().getNonReferenceType();
14100 if (FieldType->isIncompleteArrayType()) {
14101 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\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14102, __PRETTY_FUNCTION__))
14102 "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\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14102, __PRETTY_FUNCTION__))
;
14103 continue;
14104 }
14105
14106 // Build references to the field in the object we're copying from and to.
14107 LookupResult MemberLookup(*this, Field->getDeclName(), Loc,
14108 LookupMemberName);
14109 MemberLookup.addDecl(Field);
14110 MemberLookup.resolveKind();
14111 MemberBuilder From(MoveOther, OtherRefType,
14112 /*IsArrow=*/false, MemberLookup);
14113 MemberBuilder To(This, getCurrentThisType(),
14114 /*IsArrow=*/true, MemberLookup);
14115
14116 assert(!From.build(*this, Loc)->isLValue() && // could be xvalue or prvalue((!From.build(*this, Loc)->isLValue() && "Member reference with rvalue base must be rvalue except for reference "
"members, which aren't allowed for move assignment.") ? static_cast
<void> (0) : __assert_fail ("!From.build(*this, Loc)->isLValue() && \"Member reference with rvalue base must be rvalue except for reference \" \"members, which aren't allowed for move assignment.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14118, __PRETTY_FUNCTION__))
14117 "Member reference with rvalue base must be rvalue except for reference "((!From.build(*this, Loc)->isLValue() && "Member reference with rvalue base must be rvalue except for reference "
"members, which aren't allowed for move assignment.") ? static_cast
<void> (0) : __assert_fail ("!From.build(*this, Loc)->isLValue() && \"Member reference with rvalue base must be rvalue except for reference \" \"members, which aren't allowed for move assignment.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14118, __PRETTY_FUNCTION__))
14118 "members, which aren't allowed for move assignment.")((!From.build(*this, Loc)->isLValue() && "Member reference with rvalue base must be rvalue except for reference "
"members, which aren't allowed for move assignment.") ? static_cast
<void> (0) : __assert_fail ("!From.build(*this, Loc)->isLValue() && \"Member reference with rvalue base must be rvalue except for reference \" \"members, which aren't allowed for move assignment.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14118, __PRETTY_FUNCTION__))
;
14119
14120 // Build the move of this field.
14121 StmtResult Move = buildSingleCopyAssign(*this, Loc, FieldType,
14122 To, From,
14123 /*CopyingBaseSubobject=*/false,
14124 /*Copying=*/false);
14125 if (Move.isInvalid()) {
14126 MoveAssignOperator->setInvalidDecl();
14127 return;
14128 }
14129
14130 // Success! Record the copy.
14131 Statements.push_back(Move.getAs<Stmt>());
14132 }
14133
14134 if (!Invalid) {
14135 // Add a "return *this;"
14136 ExprResult ThisObj =
14137 CreateBuiltinUnaryOp(Loc, UO_Deref, This.build(*this, Loc));
14138
14139 StmtResult Return = BuildReturnStmt(Loc, ThisObj.get());
14140 if (Return.isInvalid())
14141 Invalid = true;
14142 else
14143 Statements.push_back(Return.getAs<Stmt>());
14144 }
14145
14146 if (Invalid) {
14147 MoveAssignOperator->setInvalidDecl();
14148 return;
14149 }
14150
14151 StmtResult Body;
14152 {
14153 CompoundScopeRAII CompoundScope(*this);
14154 Body = ActOnCompoundStmt(Loc, Loc, Statements,
14155 /*isStmtExpr=*/false);
14156 assert(!Body.isInvalid() && "Compound statement creation cannot fail")((!Body.isInvalid() && "Compound statement creation cannot fail"
) ? static_cast<void> (0) : __assert_fail ("!Body.isInvalid() && \"Compound statement creation cannot fail\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14156, __PRETTY_FUNCTION__))
;
14157 }
14158 MoveAssignOperator->setBody(Body.getAs<Stmt>());
14159 MoveAssignOperator->markUsed(Context);
14160
14161 if (ASTMutationListener *L = getASTMutationListener()) {
14162 L->CompletedImplicitDefinition(MoveAssignOperator);
14163 }
14164}
14165
14166CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor(
14167 CXXRecordDecl *ClassDecl) {
14168 // C++ [class.copy]p4:
14169 // If the class definition does not explicitly declare a copy
14170 // constructor, one is declared implicitly.
14171 assert(ClassDecl->needsImplicitCopyConstructor())((ClassDecl->needsImplicitCopyConstructor()) ? static_cast
<void> (0) : __assert_fail ("ClassDecl->needsImplicitCopyConstructor()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14171, __PRETTY_FUNCTION__))
;
14172
14173 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyConstructor);
14174 if (DSM.isAlreadyBeingDeclared())
14175 return nullptr;
14176
14177 QualType ClassType = Context.getTypeDeclType(ClassDecl);
14178 QualType ArgType = ClassType;
14179 bool Const = ClassDecl->implicitCopyConstructorHasConstParam();
14180 if (Const)
14181 ArgType = ArgType.withConst();
14182
14183 LangAS AS = getDefaultCXXMethodAddrSpace();
14184 if (AS != LangAS::Default)
14185 ArgType = Context.getAddrSpaceQualType(ArgType, AS);
14186
14187 ArgType = Context.getLValueReferenceType(ArgType);
14188
14189 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
14190 CXXCopyConstructor,
14191 Const);
14192
14193 DeclarationName Name
14194 = Context.DeclarationNames.getCXXConstructorName(
14195 Context.getCanonicalType(ClassType));
14196 SourceLocation ClassLoc = ClassDecl->getLocation();
14197 DeclarationNameInfo NameInfo(Name, ClassLoc);
14198
14199 // An implicitly-declared copy constructor is an inline public
14200 // member of its class.
14201 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create(
14202 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/nullptr,
14203 ExplicitSpecifier(),
14204 /*isInline=*/true,
14205 /*isImplicitlyDeclared=*/true,
14206 Constexpr ? CSK_constexpr : CSK_unspecified);
14207 CopyConstructor->setAccess(AS_public);
14208 CopyConstructor->setDefaulted();
14209
14210 if (getLangOpts().CUDA) {
14211 inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXCopyConstructor,
14212 CopyConstructor,
14213 /* ConstRHS */ Const,
14214 /* Diagnose */ false);
14215 }
14216
14217 setupImplicitSpecialMemberType(CopyConstructor, Context.VoidTy, ArgType);
14218
14219 // Add the parameter to the constructor.
14220 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor,
14221 ClassLoc, ClassLoc,
14222 /*IdentifierInfo=*/nullptr,
14223 ArgType, /*TInfo=*/nullptr,
14224 SC_None, nullptr);
14225 CopyConstructor->setParams(FromParam);
14226
14227 CopyConstructor->setTrivial(
14228 ClassDecl->needsOverloadResolutionForCopyConstructor()
14229 ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor)
14230 : ClassDecl->hasTrivialCopyConstructor());
14231
14232 CopyConstructor->setTrivialForCall(
14233 ClassDecl->hasAttr<TrivialABIAttr>() ||
14234 (ClassDecl->needsOverloadResolutionForCopyConstructor()
14235 ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor,
14236 TAH_ConsiderTrivialABI)
14237 : ClassDecl->hasTrivialCopyConstructorForCall()));
14238
14239 // Note that we have declared this constructor.
14240 ++getASTContext().NumImplicitCopyConstructorsDeclared;
14241
14242 Scope *S = getScopeForContext(ClassDecl);
14243 CheckImplicitSpecialMemberDeclaration(S, CopyConstructor);
14244
14245 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) {
14246 ClassDecl->setImplicitCopyConstructorIsDeleted();
14247 SetDeclDeleted(CopyConstructor, ClassLoc);
14248 }
14249
14250 if (S)
14251 PushOnScopeChains(CopyConstructor, S, false);
14252 ClassDecl->addDecl(CopyConstructor);
14253
14254 return CopyConstructor;
14255}
14256
14257void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation,
14258 CXXConstructorDecl *CopyConstructor) {
14259 assert((CopyConstructor->isDefaulted() &&(((CopyConstructor->isDefaulted() && CopyConstructor
->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody
() && !CopyConstructor->isDeleted()) && "DefineImplicitCopyConstructor - call it for implicit copy ctor"
) ? static_cast<void> (0) : __assert_fail ("(CopyConstructor->isDefaulted() && CopyConstructor->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody() && !CopyConstructor->isDeleted()) && \"DefineImplicitCopyConstructor - call it for implicit copy ctor\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14263, __PRETTY_FUNCTION__))
14260 CopyConstructor->isCopyConstructor() &&(((CopyConstructor->isDefaulted() && CopyConstructor
->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody
() && !CopyConstructor->isDeleted()) && "DefineImplicitCopyConstructor - call it for implicit copy ctor"
) ? static_cast<void> (0) : __assert_fail ("(CopyConstructor->isDefaulted() && CopyConstructor->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody() && !CopyConstructor->isDeleted()) && \"DefineImplicitCopyConstructor - call it for implicit copy ctor\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14263, __PRETTY_FUNCTION__))
14261 !CopyConstructor->doesThisDeclarationHaveABody() &&(((CopyConstructor->isDefaulted() && CopyConstructor
->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody
() && !CopyConstructor->isDeleted()) && "DefineImplicitCopyConstructor - call it for implicit copy ctor"
) ? static_cast<void> (0) : __assert_fail ("(CopyConstructor->isDefaulted() && CopyConstructor->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody() && !CopyConstructor->isDeleted()) && \"DefineImplicitCopyConstructor - call it for implicit copy ctor\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14263, __PRETTY_FUNCTION__))
14262 !CopyConstructor->isDeleted()) &&(((CopyConstructor->isDefaulted() && CopyConstructor
->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody
() && !CopyConstructor->isDeleted()) && "DefineImplicitCopyConstructor - call it for implicit copy ctor"
) ? static_cast<void> (0) : __assert_fail ("(CopyConstructor->isDefaulted() && CopyConstructor->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody() && !CopyConstructor->isDeleted()) && \"DefineImplicitCopyConstructor - call it for implicit copy ctor\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14263, __PRETTY_FUNCTION__))
14263 "DefineImplicitCopyConstructor - call it for implicit copy ctor")(((CopyConstructor->isDefaulted() && CopyConstructor
->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody
() && !CopyConstructor->isDeleted()) && "DefineImplicitCopyConstructor - call it for implicit copy ctor"
) ? static_cast<void> (0) : __assert_fail ("(CopyConstructor->isDefaulted() && CopyConstructor->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody() && !CopyConstructor->isDeleted()) && \"DefineImplicitCopyConstructor - call it for implicit copy ctor\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14263, __PRETTY_FUNCTION__))
;
14264 if (CopyConstructor->willHaveBody() || CopyConstructor->isInvalidDecl())
14265 return;
14266
14267 CXXRecordDecl *ClassDecl = CopyConstructor->getParent();
14268 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor")((ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"
) ? static_cast<void> (0) : __assert_fail ("ClassDecl && \"DefineImplicitCopyConstructor - invalid constructor\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14268, __PRETTY_FUNCTION__))
;
14269
14270 SynthesizedFunctionScope Scope(*this, CopyConstructor);
14271
14272 // The exception specification is needed because we are defining the
14273 // function.
14274 ResolveExceptionSpec(CurrentLocation,
14275 CopyConstructor->getType()->castAs<FunctionProtoType>());
14276 MarkVTableUsed(CurrentLocation, ClassDecl);
14277
14278 // Add a context note for diagnostics produced after this point.
14279 Scope.addContextNote(CurrentLocation);
14280
14281 // C++11 [class.copy]p7:
14282 // The [definition of an implicitly declared copy constructor] is
14283 // deprecated if the class has a user-declared copy assignment operator
14284 // or a user-declared destructor.
14285 if (getLangOpts().CPlusPlus11 && CopyConstructor->isImplicit())
14286 diagnoseDeprecatedCopyOperation(*this, CopyConstructor);
14287
14288 if (SetCtorInitializers(CopyConstructor, /*AnyErrors=*/false)) {
14289 CopyConstructor->setInvalidDecl();
14290 } else {
14291 SourceLocation Loc = CopyConstructor->getEndLoc().isValid()
14292 ? CopyConstructor->getEndLoc()
14293 : CopyConstructor->getLocation();
14294 Sema::CompoundScopeRAII CompoundScope(*this);
14295 CopyConstructor->setBody(
14296 ActOnCompoundStmt(Loc, Loc, None, /*isStmtExpr=*/false).getAs<Stmt>());
14297 CopyConstructor->markUsed(Context);
14298 }
14299
14300 if (ASTMutationListener *L = getASTMutationListener()) {
14301 L->CompletedImplicitDefinition(CopyConstructor);
14302 }
14303}
14304
14305CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor(
14306 CXXRecordDecl *ClassDecl) {
14307 assert(ClassDecl->needsImplicitMoveConstructor())((ClassDecl->needsImplicitMoveConstructor()) ? static_cast
<void> (0) : __assert_fail ("ClassDecl->needsImplicitMoveConstructor()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14307, __PRETTY_FUNCTION__))
;
14308
14309 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveConstructor);
14310 if (DSM.isAlreadyBeingDeclared())
14311 return nullptr;
14312
14313 QualType ClassType = Context.getTypeDeclType(ClassDecl);
14314
14315 QualType ArgType = ClassType;
14316 LangAS AS = getDefaultCXXMethodAddrSpace();
14317 if (AS != LangAS::Default)
14318 ArgType = Context.getAddrSpaceQualType(ClassType, AS);
14319 ArgType = Context.getRValueReferenceType(ArgType);
14320
14321 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
14322 CXXMoveConstructor,
14323 false);
14324
14325 DeclarationName Name
14326 = Context.DeclarationNames.getCXXConstructorName(
14327 Context.getCanonicalType(ClassType));
14328 SourceLocation ClassLoc = ClassDecl->getLocation();
14329 DeclarationNameInfo NameInfo(Name, ClassLoc);
14330
14331 // C++11 [class.copy]p11:
14332 // An implicitly-declared copy/move constructor is an inline public
14333 // member of its class.
14334 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create(
14335 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/nullptr,
14336 ExplicitSpecifier(),
14337 /*isInline=*/true,
14338 /*isImplicitlyDeclared=*/true,
14339 Constexpr ? CSK_constexpr : CSK_unspecified);
14340 MoveConstructor->setAccess(AS_public);
14341 MoveConstructor->setDefaulted();
14342
14343 if (getLangOpts().CUDA) {
14344 inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXMoveConstructor,
14345 MoveConstructor,
14346 /* ConstRHS */ false,
14347 /* Diagnose */ false);
14348 }
14349
14350 setupImplicitSpecialMemberType(MoveConstructor, Context.VoidTy, ArgType);
14351
14352 // Add the parameter to the constructor.
14353 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor,
14354 ClassLoc, ClassLoc,
14355 /*IdentifierInfo=*/nullptr,
14356 ArgType, /*TInfo=*/nullptr,
14357 SC_None, nullptr);
14358 MoveConstructor->setParams(FromParam);
14359
14360 MoveConstructor->setTrivial(
14361 ClassDecl->needsOverloadResolutionForMoveConstructor()
14362 ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor)
14363 : ClassDecl->hasTrivialMoveConstructor());
14364
14365 MoveConstructor->setTrivialForCall(
14366 ClassDecl->hasAttr<TrivialABIAttr>() ||
14367 (ClassDecl->needsOverloadResolutionForMoveConstructor()
14368 ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor,
14369 TAH_ConsiderTrivialABI)
14370 : ClassDecl->hasTrivialMoveConstructorForCall()));
14371
14372 // Note that we have declared this constructor.
14373 ++getASTContext().NumImplicitMoveConstructorsDeclared;
14374
14375 Scope *S = getScopeForContext(ClassDecl);
14376 CheckImplicitSpecialMemberDeclaration(S, MoveConstructor);
14377
14378 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) {
14379 ClassDecl->setImplicitMoveConstructorIsDeleted();
14380 SetDeclDeleted(MoveConstructor, ClassLoc);
14381 }
14382
14383 if (S)
14384 PushOnScopeChains(MoveConstructor, S, false);
14385 ClassDecl->addDecl(MoveConstructor);
14386
14387 return MoveConstructor;
14388}
14389
14390void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation,
14391 CXXConstructorDecl *MoveConstructor) {
14392 assert((MoveConstructor->isDefaulted() &&(((MoveConstructor->isDefaulted() && MoveConstructor
->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody
() && !MoveConstructor->isDeleted()) && "DefineImplicitMoveConstructor - call it for implicit move ctor"
) ? static_cast<void> (0) : __assert_fail ("(MoveConstructor->isDefaulted() && MoveConstructor->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody() && !MoveConstructor->isDeleted()) && \"DefineImplicitMoveConstructor - call it for implicit move ctor\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14396, __PRETTY_FUNCTION__))
14393 MoveConstructor->isMoveConstructor() &&(((MoveConstructor->isDefaulted() && MoveConstructor
->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody
() && !MoveConstructor->isDeleted()) && "DefineImplicitMoveConstructor - call it for implicit move ctor"
) ? static_cast<void> (0) : __assert_fail ("(MoveConstructor->isDefaulted() && MoveConstructor->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody() && !MoveConstructor->isDeleted()) && \"DefineImplicitMoveConstructor - call it for implicit move ctor\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14396, __PRETTY_FUNCTION__))
14394 !MoveConstructor->doesThisDeclarationHaveABody() &&(((MoveConstructor->isDefaulted() && MoveConstructor
->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody
() && !MoveConstructor->isDeleted()) && "DefineImplicitMoveConstructor - call it for implicit move ctor"
) ? static_cast<void> (0) : __assert_fail ("(MoveConstructor->isDefaulted() && MoveConstructor->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody() && !MoveConstructor->isDeleted()) && \"DefineImplicitMoveConstructor - call it for implicit move ctor\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14396, __PRETTY_FUNCTION__))
14395 !MoveConstructor->isDeleted()) &&(((MoveConstructor->isDefaulted() && MoveConstructor
->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody
() && !MoveConstructor->isDeleted()) && "DefineImplicitMoveConstructor - call it for implicit move ctor"
) ? static_cast<void> (0) : __assert_fail ("(MoveConstructor->isDefaulted() && MoveConstructor->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody() && !MoveConstructor->isDeleted()) && \"DefineImplicitMoveConstructor - call it for implicit move ctor\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14396, __PRETTY_FUNCTION__))
14396 "DefineImplicitMoveConstructor - call it for implicit move ctor")(((MoveConstructor->isDefaulted() && MoveConstructor
->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody
() && !MoveConstructor->isDeleted()) && "DefineImplicitMoveConstructor - call it for implicit move ctor"
) ? static_cast<void> (0) : __assert_fail ("(MoveConstructor->isDefaulted() && MoveConstructor->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody() && !MoveConstructor->isDeleted()) && \"DefineImplicitMoveConstructor - call it for implicit move ctor\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14396, __PRETTY_FUNCTION__))
;
14397 if (MoveConstructor->willHaveBody() || MoveConstructor->isInvalidDecl())
14398 return;
14399
14400 CXXRecordDecl *ClassDecl = MoveConstructor->getParent();
14401 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor")((ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"
) ? static_cast<void> (0) : __assert_fail ("ClassDecl && \"DefineImplicitMoveConstructor - invalid constructor\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14401, __PRETTY_FUNCTION__))
;
14402
14403 SynthesizedFunctionScope Scope(*this, MoveConstructor);
14404
14405 // The exception specification is needed because we are defining the
14406 // function.
14407 ResolveExceptionSpec(CurrentLocation,
14408 MoveConstructor->getType()->castAs<FunctionProtoType>());
14409 MarkVTableUsed(CurrentLocation, ClassDecl);
14410
14411 // Add a context note for diagnostics produced after this point.
14412 Scope.addContextNote(CurrentLocation);
14413
14414 if (SetCtorInitializers(MoveConstructor, /*AnyErrors=*/false)) {
14415 MoveConstructor->setInvalidDecl();
14416 } else {
14417 SourceLocation Loc = MoveConstructor->getEndLoc().isValid()
14418 ? MoveConstructor->getEndLoc()
14419 : MoveConstructor->getLocation();
14420 Sema::CompoundScopeRAII CompoundScope(*this);
14421 MoveConstructor->setBody(ActOnCompoundStmt(
14422 Loc, Loc, None, /*isStmtExpr=*/ false).getAs<Stmt>());
14423 MoveConstructor->markUsed(Context);
14424 }
14425
14426 if (ASTMutationListener *L = getASTMutationListener()) {
14427 L->CompletedImplicitDefinition(MoveConstructor);
14428 }
14429}
14430
14431bool Sema::isImplicitlyDeleted(FunctionDecl *FD) {
14432 return FD->isDeleted() && FD->isDefaulted() && isa<CXXMethodDecl>(FD);
14433}
14434
14435void Sema::DefineImplicitLambdaToFunctionPointerConversion(
14436 SourceLocation CurrentLocation,
14437 CXXConversionDecl *Conv) {
14438 SynthesizedFunctionScope Scope(*this, Conv);
14439 assert(!Conv->getReturnType()->isUndeducedType())((!Conv->getReturnType()->isUndeducedType()) ? static_cast
<void> (0) : __assert_fail ("!Conv->getReturnType()->isUndeducedType()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14439, __PRETTY_FUNCTION__))
;
14440
14441 CXXRecordDecl *Lambda = Conv->getParent();
14442 FunctionDecl *CallOp = Lambda->getLambdaCallOperator();
14443 FunctionDecl *Invoker = Lambda->getLambdaStaticInvoker();
14444
14445 if (auto *TemplateArgs = Conv->getTemplateSpecializationArgs()) {
14446 CallOp = InstantiateFunctionDeclaration(
14447 CallOp->getDescribedFunctionTemplate(), TemplateArgs, CurrentLocation);
14448 if (!CallOp)
14449 return;
14450
14451 Invoker = InstantiateFunctionDeclaration(
14452 Invoker->getDescribedFunctionTemplate(), TemplateArgs, CurrentLocation);
14453 if (!Invoker)
14454 return;
14455 }
14456
14457 if (CallOp->isInvalidDecl())
14458 return;
14459
14460 // Mark the call operator referenced (and add to pending instantiations
14461 // if necessary).
14462 // For both the conversion and static-invoker template specializations
14463 // we construct their body's in this function, so no need to add them
14464 // to the PendingInstantiations.
14465 MarkFunctionReferenced(CurrentLocation, CallOp);
14466
14467 // Fill in the __invoke function with a dummy implementation. IR generation
14468 // will fill in the actual details. Update its type in case it contained
14469 // an 'auto'.
14470 Invoker->markUsed(Context);
14471 Invoker->setReferenced();
14472 Invoker->setType(Conv->getReturnType()->getPointeeType());
14473 Invoker->setBody(new (Context) CompoundStmt(Conv->getLocation()));
14474
14475 // Construct the body of the conversion function { return __invoke; }.
14476 Expr *FunctionRef = BuildDeclRefExpr(Invoker, Invoker->getType(),
14477 VK_LValue, Conv->getLocation());
14478 assert(FunctionRef && "Can't refer to __invoke function?")((FunctionRef && "Can't refer to __invoke function?")
? static_cast<void> (0) : __assert_fail ("FunctionRef && \"Can't refer to __invoke function?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14478, __PRETTY_FUNCTION__))
;
14479 Stmt *Return = BuildReturnStmt(Conv->getLocation(), FunctionRef).get();
14480 Conv->setBody(CompoundStmt::Create(Context, Return, Conv->getLocation(),
14481 Conv->getLocation()));
14482 Conv->markUsed(Context);
14483 Conv->setReferenced();
14484
14485 if (ASTMutationListener *L = getASTMutationListener()) {
14486 L->CompletedImplicitDefinition(Conv);
14487 L->CompletedImplicitDefinition(Invoker);
14488 }
14489}
14490
14491
14492
14493void Sema::DefineImplicitLambdaToBlockPointerConversion(
14494 SourceLocation CurrentLocation,
14495 CXXConversionDecl *Conv)
14496{
14497 assert(!Conv->getParent()->isGenericLambda())((!Conv->getParent()->isGenericLambda()) ? static_cast<
void> (0) : __assert_fail ("!Conv->getParent()->isGenericLambda()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14497, __PRETTY_FUNCTION__))
;
14498
14499 SynthesizedFunctionScope Scope(*this, Conv);
14500
14501 // Copy-initialize the lambda object as needed to capture it.
14502 Expr *This = ActOnCXXThis(CurrentLocation).get();
14503 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).get();
14504
14505 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation,
14506 Conv->getLocation(),
14507 Conv, DerefThis);
14508
14509 // If we're not under ARC, make sure we still get the _Block_copy/autorelease
14510 // behavior. Note that only the general conversion function does this
14511 // (since it's unusable otherwise); in the case where we inline the
14512 // block literal, it has block literal lifetime semantics.
14513 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount)
14514 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(),
14515 CK_CopyAndAutoreleaseBlockObject,
14516 BuildBlock.get(), nullptr, VK_RValue);
14517
14518 if (BuildBlock.isInvalid()) {
14519 Diag(CurrentLocation, diag::note_lambda_to_block_conv);
14520 Conv->setInvalidDecl();
14521 return;
14522 }
14523
14524 // Create the return statement that returns the block from the conversion
14525 // function.
14526 StmtResult Return = BuildReturnStmt(Conv->getLocation(), BuildBlock.get());
14527 if (Return.isInvalid()) {
14528 Diag(CurrentLocation, diag::note_lambda_to_block_conv);
14529 Conv->setInvalidDecl();
14530 return;
14531 }
14532
14533 // Set the body of the conversion function.
14534 Stmt *ReturnS = Return.get();
14535 Conv->setBody(CompoundStmt::Create(Context, ReturnS, Conv->getLocation(),
14536 Conv->getLocation()));
14537 Conv->markUsed(Context);
14538
14539 // We're done; notify the mutation listener, if any.
14540 if (ASTMutationListener *L = getASTMutationListener()) {
14541 L->CompletedImplicitDefinition(Conv);
14542 }
14543}
14544
14545/// Determine whether the given list arguments contains exactly one
14546/// "real" (non-default) argument.
14547static bool hasOneRealArgument(MultiExprArg Args) {
14548 switch (Args.size()) {
14549 case 0:
14550 return false;
14551
14552 default:
14553 if (!Args[1]->isDefaultArgument())
14554 return false;
14555
14556 LLVM_FALLTHROUGH[[gnu::fallthrough]];
14557 case 1:
14558 return !Args[0]->isDefaultArgument();
14559 }
14560
14561 return false;
14562}
14563
14564ExprResult
14565Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
14566 NamedDecl *FoundDecl,
14567 CXXConstructorDecl *Constructor,
14568 MultiExprArg ExprArgs,
14569 bool HadMultipleCandidates,
14570 bool IsListInitialization,
14571 bool IsStdInitListInitialization,
14572 bool RequiresZeroInit,
14573 unsigned ConstructKind,
14574 SourceRange ParenRange) {
14575 bool Elidable = false;
14576
14577 // C++0x [class.copy]p34:
14578 // When certain criteria are met, an implementation is allowed to
14579 // omit the copy/move construction of a class object, even if the
14580 // copy/move constructor and/or destructor for the object have
14581 // side effects. [...]
14582 // - when a temporary class object that has not been bound to a
14583 // reference (12.2) would be copied/moved to a class object
14584 // with the same cv-unqualified type, the copy/move operation
14585 // can be omitted by constructing the temporary object
14586 // directly into the target of the omitted copy/move
14587 if (ConstructKind == CXXConstructExpr::CK_Complete && Constructor &&
14588 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) {
14589 Expr *SubExpr = ExprArgs[0];
14590 Elidable = SubExpr->isTemporaryObject(
14591 Context, cast<CXXRecordDecl>(FoundDecl->getDeclContext()));
14592 }
14593
14594 return BuildCXXConstructExpr(ConstructLoc, DeclInitType,
14595 FoundDecl, Constructor,
14596 Elidable, ExprArgs, HadMultipleCandidates,
14597 IsListInitialization,
14598 IsStdInitListInitialization, RequiresZeroInit,
14599 ConstructKind, ParenRange);
14600}
14601
14602ExprResult
14603Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
14604 NamedDecl *FoundDecl,
14605 CXXConstructorDecl *Constructor,
14606 bool Elidable,
14607 MultiExprArg ExprArgs,
14608 bool HadMultipleCandidates,
14609 bool IsListInitialization,
14610 bool IsStdInitListInitialization,
14611 bool RequiresZeroInit,
14612 unsigned ConstructKind,
14613 SourceRange ParenRange) {
14614 if (auto *Shadow = dyn_cast<ConstructorUsingShadowDecl>(FoundDecl)) {
14615 Constructor = findInheritingConstructor(ConstructLoc, Constructor, Shadow);
14616 if (DiagnoseUseOfDecl(Constructor, ConstructLoc))
14617 return ExprError();
14618 }
14619
14620 return BuildCXXConstructExpr(
14621 ConstructLoc, DeclInitType, Constructor, Elidable, ExprArgs,
14622 HadMultipleCandidates, IsListInitialization, IsStdInitListInitialization,
14623 RequiresZeroInit, ConstructKind, ParenRange);
14624}
14625
14626/// BuildCXXConstructExpr - Creates a complete call to a constructor,
14627/// including handling of its default argument expressions.
14628ExprResult
14629Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
14630 CXXConstructorDecl *Constructor,
14631 bool Elidable,
14632 MultiExprArg ExprArgs,
14633 bool HadMultipleCandidates,
14634 bool IsListInitialization,
14635 bool IsStdInitListInitialization,
14636 bool RequiresZeroInit,
14637 unsigned ConstructKind,
14638 SourceRange ParenRange) {
14639 assert(declaresSameEntity(((declaresSameEntity( Constructor->getParent(), DeclInitType
->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) &&
"given constructor for wrong type") ? static_cast<void>
(0) : __assert_fail ("declaresSameEntity( Constructor->getParent(), DeclInitType->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) && \"given constructor for wrong type\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14642, __PRETTY_FUNCTION__))
14640 Constructor->getParent(),((declaresSameEntity( Constructor->getParent(), DeclInitType
->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) &&
"given constructor for wrong type") ? static_cast<void>
(0) : __assert_fail ("declaresSameEntity( Constructor->getParent(), DeclInitType->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) && \"given constructor for wrong type\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14642, __PRETTY_FUNCTION__))
14641 DeclInitType->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) &&((declaresSameEntity( Constructor->getParent(), DeclInitType
->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) &&
"given constructor for wrong type") ? static_cast<void>
(0) : __assert_fail ("declaresSameEntity( Constructor->getParent(), DeclInitType->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) && \"given constructor for wrong type\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14642, __PRETTY_FUNCTION__))
14642 "given constructor for wrong type")((declaresSameEntity( Constructor->getParent(), DeclInitType
->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) &&
"given constructor for wrong type") ? static_cast<void>
(0) : __assert_fail ("declaresSameEntity( Constructor->getParent(), DeclInitType->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) && \"given constructor for wrong type\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14642, __PRETTY_FUNCTION__))
;
14643 MarkFunctionReferenced(ConstructLoc, Constructor);
14644 if (getLangOpts().CUDA && !CheckCUDACall(ConstructLoc, Constructor))
14645 return ExprError();
14646
14647 return CXXConstructExpr::Create(
14648 Context, DeclInitType, ConstructLoc, Constructor, Elidable,
14649 ExprArgs, HadMultipleCandidates, IsListInitialization,
14650 IsStdInitListInitialization, RequiresZeroInit,
14651 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind),
14652 ParenRange);
14653}
14654
14655ExprResult Sema::BuildCXXDefaultInitExpr(SourceLocation Loc, FieldDecl *Field) {
14656 assert(Field->hasInClassInitializer())((Field->hasInClassInitializer()) ? static_cast<void>
(0) : __assert_fail ("Field->hasInClassInitializer()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14656, __PRETTY_FUNCTION__))
;
14657
14658 // If we already have the in-class initializer nothing needs to be done.
14659 if (Field->getInClassInitializer())
14660 return CXXDefaultInitExpr::Create(Context, Loc, Field, CurContext);
14661
14662 // If we might have already tried and failed to instantiate, don't try again.
14663 if (Field->isInvalidDecl())
14664 return ExprError();
14665
14666 // Maybe we haven't instantiated the in-class initializer. Go check the
14667 // pattern FieldDecl to see if it has one.
14668 CXXRecordDecl *ParentRD = cast<CXXRecordDecl>(Field->getParent());
14669
14670 if (isTemplateInstantiation(ParentRD->getTemplateSpecializationKind())) {
14671 CXXRecordDecl *ClassPattern = ParentRD->getTemplateInstantiationPattern();
14672 DeclContext::lookup_result Lookup =
14673 ClassPattern->lookup(Field->getDeclName());
14674
14675 // Lookup can return at most two results: the pattern for the field, or the
14676 // injected class name of the parent record. No other member can have the
14677 // same name as the field.
14678 // In modules mode, lookup can return multiple results (coming from
14679 // different modules).
14680 assert((getLangOpts().Modules || (!Lookup.empty() && Lookup.size() <= 2)) &&(((getLangOpts().Modules || (!Lookup.empty() && Lookup
.size() <= 2)) && "more than two lookup results for field name"
) ? static_cast<void> (0) : __assert_fail ("(getLangOpts().Modules || (!Lookup.empty() && Lookup.size() <= 2)) && \"more than two lookup results for field name\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14681, __PRETTY_FUNCTION__))
14681 "more than two lookup results for field name")(((getLangOpts().Modules || (!Lookup.empty() && Lookup
.size() <= 2)) && "more than two lookup results for field name"
) ? static_cast<void> (0) : __assert_fail ("(getLangOpts().Modules || (!Lookup.empty() && Lookup.size() <= 2)) && \"more than two lookup results for field name\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14681, __PRETTY_FUNCTION__))
;
14682 FieldDecl *Pattern = dyn_cast<FieldDecl>(Lookup[0]);
14683 if (!Pattern) {
14684 assert(isa<CXXRecordDecl>(Lookup[0]) &&((isa<CXXRecordDecl>(Lookup[0]) && "cannot have other non-field member with same name"
) ? static_cast<void> (0) : __assert_fail ("isa<CXXRecordDecl>(Lookup[0]) && \"cannot have other non-field member with same name\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14685, __PRETTY_FUNCTION__))
14685 "cannot have other non-field member with same name")((isa<CXXRecordDecl>(Lookup[0]) && "cannot have other non-field member with same name"
) ? static_cast<void> (0) : __assert_fail ("isa<CXXRecordDecl>(Lookup[0]) && \"cannot have other non-field member with same name\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14685, __PRETTY_FUNCTION__))
;
14686 for (auto L : Lookup)
14687 if (isa<FieldDecl>(L)) {
14688 Pattern = cast<FieldDecl>(L);
14689 break;
14690 }
14691 assert(Pattern && "We must have set the Pattern!")((Pattern && "We must have set the Pattern!") ? static_cast
<void> (0) : __assert_fail ("Pattern && \"We must have set the Pattern!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14691, __PRETTY_FUNCTION__))
;
14692 }
14693
14694 if (!Pattern->hasInClassInitializer() ||
14695 InstantiateInClassInitializer(Loc, Field, Pattern,
14696 getTemplateInstantiationArgs(Field))) {
14697 // Don't diagnose this again.
14698 Field->setInvalidDecl();
14699 return ExprError();
14700 }
14701 return CXXDefaultInitExpr::Create(Context, Loc, Field, CurContext);
14702 }
14703
14704 // DR1351:
14705 // If the brace-or-equal-initializer of a non-static data member
14706 // invokes a defaulted default constructor of its class or of an
14707 // enclosing class in a potentially evaluated subexpression, the
14708 // program is ill-formed.
14709 //
14710 // This resolution is unworkable: the exception specification of the
14711 // default constructor can be needed in an unevaluated context, in
14712 // particular, in the operand of a noexcept-expression, and we can be
14713 // unable to compute an exception specification for an enclosed class.
14714 //
14715 // Any attempt to resolve the exception specification of a defaulted default
14716 // constructor before the initializer is lexically complete will ultimately
14717 // come here at which point we can diagnose it.
14718 RecordDecl *OutermostClass = ParentRD->getOuterLexicalRecordContext();
14719 Diag(Loc, diag::err_in_class_initializer_not_yet_parsed)
14720 << OutermostClass << Field;
14721 Diag(Field->getEndLoc(), diag::note_in_class_initializer_not_yet_parsed);
14722 // Recover by marking the field invalid, unless we're in a SFINAE context.
14723 if (!isSFINAEContext())
14724 Field->setInvalidDecl();
14725 return ExprError();
14726}
14727
14728void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) {
14729 if (VD->isInvalidDecl()) return;
14730
14731 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl());
14732 if (ClassDecl->isInvalidDecl()) return;
14733 if (ClassDecl->hasIrrelevantDestructor()) return;
14734 if (ClassDecl->isDependentContext()) return;
14735
14736 if (VD->isNoDestroy(getASTContext()))
14737 return;
14738
14739 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl);
14740
14741 // If this is an array, we'll require the destructor during initialization, so
14742 // we can skip over this. We still want to emit exit-time destructor warnings
14743 // though.
14744 if (!VD->getType()->isArrayType()) {
14745 MarkFunctionReferenced(VD->getLocation(), Destructor);
14746 CheckDestructorAccess(VD->getLocation(), Destructor,
14747 PDiag(diag::err_access_dtor_var)
14748 << VD->getDeclName() << VD->getType());
14749 DiagnoseUseOfDecl(Destructor, VD->getLocation());
14750 }
14751
14752 if (Destructor->isTrivial()) return;
14753
14754 // If the destructor is constexpr, check whether the variable has constant
14755 // destruction now.
14756 if (Destructor->isConstexpr() && VD->getInit() &&
14757 !VD->getInit()->isValueDependent() && VD->evaluateValue()) {
14758 SmallVector<PartialDiagnosticAt, 8> Notes;
14759 if (!VD->evaluateDestruction(Notes) && VD->isConstexpr()) {
14760 Diag(VD->getLocation(),
14761 diag::err_constexpr_var_requires_const_destruction) << VD;
14762 for (unsigned I = 0, N = Notes.size(); I != N; ++I)
14763 Diag(Notes[I].first, Notes[I].second);
14764 }
14765 }
14766
14767 if (!VD->hasGlobalStorage()) return;
14768
14769 // Emit warning for non-trivial dtor in global scope (a real global,
14770 // class-static, function-static).
14771 Diag(VD->getLocation(), diag::warn_exit_time_destructor);
14772
14773 // TODO: this should be re-enabled for static locals by !CXAAtExit
14774 if (!VD->isStaticLocal())
14775 Diag(VD->getLocation(), diag::warn_global_destructor);
14776}
14777
14778/// Given a constructor and the set of arguments provided for the
14779/// constructor, convert the arguments and add any required default arguments
14780/// to form a proper call to this constructor.
14781///
14782/// \returns true if an error occurred, false otherwise.
14783bool
14784Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor,
14785 MultiExprArg ArgsPtr,
14786 SourceLocation Loc,
14787 SmallVectorImpl<Expr*> &ConvertedArgs,
14788 bool AllowExplicit,
14789 bool IsListInitialization) {
14790 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall.
14791 unsigned NumArgs = ArgsPtr.size();
14792 Expr **Args = ArgsPtr.data();
14793
14794 const FunctionProtoType *Proto
14795 = Constructor->getType()->getAs<FunctionProtoType>();
14796 assert(Proto && "Constructor without a prototype?")((Proto && "Constructor without a prototype?") ? static_cast
<void> (0) : __assert_fail ("Proto && \"Constructor without a prototype?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14796, __PRETTY_FUNCTION__))
;
14797 unsigned NumParams = Proto->getNumParams();
14798
14799 // If too few arguments are available, we'll fill in the rest with defaults.
14800 if (NumArgs < NumParams)
14801 ConvertedArgs.reserve(NumParams);
14802 else
14803 ConvertedArgs.reserve(NumArgs);
14804
14805 VariadicCallType CallType =
14806 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply;
14807 SmallVector<Expr *, 8> AllArgs;
14808 bool Invalid = GatherArgumentsForCall(Loc, Constructor,
14809 Proto, 0,
14810 llvm::makeArrayRef(Args, NumArgs),
14811 AllArgs,
14812 CallType, AllowExplicit,
14813 IsListInitialization);
14814 ConvertedArgs.append(AllArgs.begin(), AllArgs.end());
14815
14816 DiagnoseSentinelCalls(Constructor, Loc, AllArgs);
14817
14818 CheckConstructorCall(Constructor,
14819 llvm::makeArrayRef(AllArgs.data(), AllArgs.size()),
14820 Proto, Loc);
14821
14822 return Invalid;
14823}
14824
14825static inline bool
14826CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef,
14827 const FunctionDecl *FnDecl) {
14828 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext();
14829 if (isa<NamespaceDecl>(DC)) {
14830 return SemaRef.Diag(FnDecl->getLocation(),
14831 diag::err_operator_new_delete_declared_in_namespace)
14832 << FnDecl->getDeclName();
14833 }
14834
14835 if (isa<TranslationUnitDecl>(DC) &&
14836 FnDecl->getStorageClass() == SC_Static) {
14837 return SemaRef.Diag(FnDecl->getLocation(),
14838 diag::err_operator_new_delete_declared_static)
14839 << FnDecl->getDeclName();
14840 }
14841
14842 return false;
14843}
14844
14845static QualType
14846RemoveAddressSpaceFromPtr(Sema &SemaRef, const PointerType *PtrTy) {
14847 QualType QTy = PtrTy->getPointeeType();
14848 QTy = SemaRef.Context.removeAddrSpaceQualType(QTy);
14849 return SemaRef.Context.getPointerType(QTy);
14850}
14851
14852static inline bool
14853CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl,
14854 CanQualType ExpectedResultType,
14855 CanQualType ExpectedFirstParamType,
14856 unsigned DependentParamTypeDiag,
14857 unsigned InvalidParamTypeDiag) {
14858 QualType ResultType =
14859 FnDecl->getType()->getAs<FunctionType>()->getReturnType();
14860
14861 // Check that the result type is not dependent.
14862 if (ResultType->isDependentType())
14863 return SemaRef.Diag(FnDecl->getLocation(),
14864 diag::err_operator_new_delete_dependent_result_type)
14865 << FnDecl->getDeclName() << ExpectedResultType;
14866
14867 // The operator is valid on any address space for OpenCL.
14868 if (SemaRef.getLangOpts().OpenCLCPlusPlus) {
14869 if (auto *PtrTy = ResultType->getAs<PointerType>()) {
14870 ResultType = RemoveAddressSpaceFromPtr(SemaRef, PtrTy);
14871 }
14872 }
14873
14874 // Check that the result type is what we expect.
14875 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType)
14876 return SemaRef.Diag(FnDecl->getLocation(),
14877 diag::err_operator_new_delete_invalid_result_type)
14878 << FnDecl->getDeclName() << ExpectedResultType;
14879
14880 // A function template must have at least 2 parameters.
14881 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2)
14882 return SemaRef.Diag(FnDecl->getLocation(),
14883 diag::err_operator_new_delete_template_too_few_parameters)
14884 << FnDecl->getDeclName();
14885
14886 // The function decl must have at least 1 parameter.
14887 if (FnDecl->getNumParams() == 0)
14888 return SemaRef.Diag(FnDecl->getLocation(),
14889 diag::err_operator_new_delete_too_few_parameters)
14890 << FnDecl->getDeclName();
14891
14892 // Check the first parameter type is not dependent.
14893 QualType FirstParamType = FnDecl->getParamDecl(0)->getType();
14894 if (FirstParamType->isDependentType())
14895 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag)
14896 << FnDecl->getDeclName() << ExpectedFirstParamType;
14897
14898 // Check that the first parameter type is what we expect.
14899 if (SemaRef.getLangOpts().OpenCLCPlusPlus) {
14900 // The operator is valid on any address space for OpenCL.
14901 if (auto *PtrTy =
14902 FnDecl->getParamDecl(0)->getType()->getAs<PointerType>()) {
14903 FirstParamType = RemoveAddressSpaceFromPtr(SemaRef, PtrTy);
14904 }
14905 }
14906 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() !=
14907 ExpectedFirstParamType)
14908 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag)
14909 << FnDecl->getDeclName() << ExpectedFirstParamType;
14910
14911 return false;
14912}
14913
14914static bool
14915CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) {
14916 // C++ [basic.stc.dynamic.allocation]p1:
14917 // A program is ill-formed if an allocation function is declared in a
14918 // namespace scope other than global scope or declared static in global
14919 // scope.
14920 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl))
14921 return true;
14922
14923 CanQualType SizeTy =
14924 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType());
14925
14926 // C++ [basic.stc.dynamic.allocation]p1:
14927 // The return type shall be void*. The first parameter shall have type
14928 // std::size_t.
14929 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy,
14930 SizeTy,
14931 diag::err_operator_new_dependent_param_type,
14932 diag::err_operator_new_param_type))
14933 return true;
14934
14935 // C++ [basic.stc.dynamic.allocation]p1:
14936 // The first parameter shall not have an associated default argument.
14937 if (FnDecl->getParamDecl(0)->hasDefaultArg())
14938 return SemaRef.Diag(FnDecl->getLocation(),
14939 diag::err_operator_new_default_arg)
14940 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange();
14941
14942 return false;
14943}
14944
14945static bool
14946CheckOperatorDeleteDeclaration(Sema &SemaRef, FunctionDecl *FnDecl) {
14947 // C++ [basic.stc.dynamic.deallocation]p1:
14948 // A program is ill-formed if deallocation functions are declared in a
14949 // namespace scope other than global scope or declared static in global
14950 // scope.
14951 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl))
14952 return true;
14953
14954 auto *MD = dyn_cast<CXXMethodDecl>(FnDecl);
14955
14956 // C++ P0722:
14957 // Within a class C, the first parameter of a destroying operator delete
14958 // shall be of type C *. The first parameter of any other deallocation
14959 // function shall be of type void *.
14960 CanQualType ExpectedFirstParamType =
14961 MD && MD->isDestroyingOperatorDelete()
14962 ? SemaRef.Context.getCanonicalType(SemaRef.Context.getPointerType(
14963 SemaRef.Context.getRecordType(MD->getParent())))
14964 : SemaRef.Context.VoidPtrTy;
14965
14966 // C++ [basic.stc.dynamic.deallocation]p2:
14967 // Each deallocation function shall return void
14968 if (CheckOperatorNewDeleteTypes(
14969 SemaRef, FnDecl, SemaRef.Context.VoidTy, ExpectedFirstParamType,
14970 diag::err_operator_delete_dependent_param_type,
14971 diag::err_operator_delete_param_type))
14972 return true;
14973
14974 // C++ P0722:
14975 // A destroying operator delete shall be a usual deallocation function.
14976 if (MD && !MD->getParent()->isDependentContext() &&
14977 MD->isDestroyingOperatorDelete() &&
14978 !SemaRef.isUsualDeallocationFunction(MD)) {
14979 SemaRef.Diag(MD->getLocation(),
14980 diag::err_destroying_operator_delete_not_usual);
14981 return true;
14982 }
14983
14984 return false;
14985}
14986
14987/// CheckOverloadedOperatorDeclaration - Check whether the declaration
14988/// of this overloaded operator is well-formed. If so, returns false;
14989/// otherwise, emits appropriate diagnostics and returns true.
14990bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) {
14991 assert(FnDecl && FnDecl->isOverloadedOperator() &&((FnDecl && FnDecl->isOverloadedOperator() &&
"Expected an overloaded operator declaration") ? static_cast
<void> (0) : __assert_fail ("FnDecl && FnDecl->isOverloadedOperator() && \"Expected an overloaded operator declaration\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14992, __PRETTY_FUNCTION__))
14992 "Expected an overloaded operator declaration")((FnDecl && FnDecl->isOverloadedOperator() &&
"Expected an overloaded operator declaration") ? static_cast
<void> (0) : __assert_fail ("FnDecl && FnDecl->isOverloadedOperator() && \"Expected an overloaded operator declaration\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 14992, __PRETTY_FUNCTION__))
;
14993
14994 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator();
14995
14996 // C++ [over.oper]p5:
14997 // The allocation and deallocation functions, operator new,
14998 // operator new[], operator delete and operator delete[], are
14999 // described completely in 3.7.3. The attributes and restrictions
15000 // found in the rest of this subclause do not apply to them unless
15001 // explicitly stated in 3.7.3.
15002 if (Op == OO_Delete || Op == OO_Array_Delete)
15003 return CheckOperatorDeleteDeclaration(*this, FnDecl);
15004
15005 if (Op == OO_New || Op == OO_Array_New)
15006 return CheckOperatorNewDeclaration(*this, FnDecl);
15007
15008 // C++ [over.oper]p6:
15009 // An operator function shall either be a non-static member
15010 // function or be a non-member function and have at least one
15011 // parameter whose type is a class, a reference to a class, an
15012 // enumeration, or a reference to an enumeration.
15013 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) {
15014 if (MethodDecl->isStatic())
15015 return Diag(FnDecl->getLocation(),
15016 diag::err_operator_overload_static) << FnDecl->getDeclName();
15017 } else {
15018 bool ClassOrEnumParam = false;
15019 for (auto Param : FnDecl->parameters()) {
15020 QualType ParamType = Param->getType().getNonReferenceType();
15021 if (ParamType->isDependentType() || ParamType->isRecordType() ||
15022 ParamType->isEnumeralType()) {
15023 ClassOrEnumParam = true;
15024 break;
15025 }
15026 }
15027
15028 if (!ClassOrEnumParam)
15029 return Diag(FnDecl->getLocation(),
15030 diag::err_operator_overload_needs_class_or_enum)
15031 << FnDecl->getDeclName();
15032 }
15033
15034 // C++ [over.oper]p8:
15035 // An operator function cannot have default arguments (8.3.6),
15036 // except where explicitly stated below.
15037 //
15038 // Only the function-call operator allows default arguments
15039 // (C++ [over.call]p1).
15040 if (Op != OO_Call) {
15041 for (auto Param : FnDecl->parameters()) {
15042 if (Param->hasDefaultArg())
15043 return Diag(Param->getLocation(),
15044 diag::err_operator_overload_default_arg)
15045 << FnDecl->getDeclName() << Param->getDefaultArgRange();
15046 }
15047 }
15048
15049 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = {
15050 { false, false, false }
15051#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \
15052 , { Unary, Binary, MemberOnly }
15053#include "clang/Basic/OperatorKinds.def"
15054 };
15055
15056 bool CanBeUnaryOperator = OperatorUses[Op][0];
15057 bool CanBeBinaryOperator = OperatorUses[Op][1];
15058 bool MustBeMemberOperator = OperatorUses[Op][2];
15059
15060 // C++ [over.oper]p8:
15061 // [...] Operator functions cannot have more or fewer parameters
15062 // than the number required for the corresponding operator, as
15063 // described in the rest of this subclause.
15064 unsigned NumParams = FnDecl->getNumParams()
15065 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0);
15066 if (Op != OO_Call &&
15067 ((NumParams == 1 && !CanBeUnaryOperator) ||
15068 (NumParams == 2 && !CanBeBinaryOperator) ||
15069 (NumParams < 1) || (NumParams > 2))) {
15070 // We have the wrong number of parameters.
15071 unsigned ErrorKind;
15072 if (CanBeUnaryOperator && CanBeBinaryOperator) {
15073 ErrorKind = 2; // 2 -> unary or binary.
15074 } else if (CanBeUnaryOperator) {
15075 ErrorKind = 0; // 0 -> unary
15076 } else {
15077 assert(CanBeBinaryOperator &&((CanBeBinaryOperator && "All non-call overloaded operators are unary or binary!"
) ? static_cast<void> (0) : __assert_fail ("CanBeBinaryOperator && \"All non-call overloaded operators are unary or binary!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 15078, __PRETTY_FUNCTION__))
15078 "All non-call overloaded operators are unary or binary!")((CanBeBinaryOperator && "All non-call overloaded operators are unary or binary!"
) ? static_cast<void> (0) : __assert_fail ("CanBeBinaryOperator && \"All non-call overloaded operators are unary or binary!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 15078, __PRETTY_FUNCTION__))
;
15079 ErrorKind = 1; // 1 -> binary
15080 }
15081
15082 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be)
15083 << FnDecl->getDeclName() << NumParams << ErrorKind;
15084 }
15085
15086 // Overloaded operators other than operator() cannot be variadic.
15087 if (Op != OO_Call &&
15088 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) {
15089 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic)
15090 << FnDecl->getDeclName();
15091 }
15092
15093 // Some operators must be non-static member functions.
15094 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) {
15095 return Diag(FnDecl->getLocation(),
15096 diag::err_operator_overload_must_be_member)
15097 << FnDecl->getDeclName();
15098 }
15099
15100 // C++ [over.inc]p1:
15101 // The user-defined function called operator++ implements the
15102 // prefix and postfix ++ operator. If this function is a member
15103 // function with no parameters, or a non-member function with one
15104 // parameter of class or enumeration type, it defines the prefix
15105 // increment operator ++ for objects of that type. If the function
15106 // is a member function with one parameter (which shall be of type
15107 // int) or a non-member function with two parameters (the second
15108 // of which shall be of type int), it defines the postfix
15109 // increment operator ++ for objects of that type.
15110 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) {
15111 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1);
15112 QualType ParamType = LastParam->getType();
15113
15114 if (!ParamType->isSpecificBuiltinType(BuiltinType::Int) &&
15115 !ParamType->isDependentType())
15116 return Diag(LastParam->getLocation(),
15117 diag::err_operator_overload_post_incdec_must_be_int)
15118 << LastParam->getType() << (Op == OO_MinusMinus);
15119 }
15120
15121 return false;
15122}
15123
15124static bool
15125checkLiteralOperatorTemplateParameterList(Sema &SemaRef,
15126 FunctionTemplateDecl *TpDecl) {
15127 TemplateParameterList *TemplateParams = TpDecl->getTemplateParameters();
15128
15129 // Must have one or two template parameters.
15130 if (TemplateParams->size() == 1) {
15131 NonTypeTemplateParmDecl *PmDecl =
15132 dyn_cast<NonTypeTemplateParmDecl>(TemplateParams->getParam(0));
15133
15134 // The template parameter must be a char parameter pack.
15135 if (PmDecl && PmDecl->isTemplateParameterPack() &&
15136 SemaRef.Context.hasSameType(PmDecl->getType(), SemaRef.Context.CharTy))
15137 return false;
15138
15139 } else if (TemplateParams->size() == 2) {
15140 TemplateTypeParmDecl *PmType =
15141 dyn_cast<TemplateTypeParmDecl>(TemplateParams->getParam(0));
15142 NonTypeTemplateParmDecl *PmArgs =
15143 dyn_cast<NonTypeTemplateParmDecl>(TemplateParams->getParam(1));
15144
15145 // The second template parameter must be a parameter pack with the
15146 // first template parameter as its type.
15147 if (PmType && PmArgs && !PmType->isTemplateParameterPack() &&
15148 PmArgs->isTemplateParameterPack()) {
15149 const TemplateTypeParmType *TArgs =
15150 PmArgs->getType()->getAs<TemplateTypeParmType>();
15151 if (TArgs && TArgs->getDepth() == PmType->getDepth() &&
15152 TArgs->getIndex() == PmType->getIndex()) {
15153 if (!SemaRef.inTemplateInstantiation())
15154 SemaRef.Diag(TpDecl->getLocation(),
15155 diag::ext_string_literal_operator_template);
15156 return false;
15157 }
15158 }
15159 }
15160
15161 SemaRef.Diag(TpDecl->getTemplateParameters()->getSourceRange().getBegin(),
15162 diag::err_literal_operator_template)
15163 << TpDecl->getTemplateParameters()->getSourceRange();
15164 return true;
15165}
15166
15167/// CheckLiteralOperatorDeclaration - Check whether the declaration
15168/// of this literal operator function is well-formed. If so, returns
15169/// false; otherwise, emits appropriate diagnostics and returns true.
15170bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) {
15171 if (isa<CXXMethodDecl>(FnDecl)) {
15172 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace)
15173 << FnDecl->getDeclName();
15174 return true;
15175 }
15176
15177 if (FnDecl->isExternC()) {
15178 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c);
15179 if (const LinkageSpecDecl *LSD =
15180 FnDecl->getDeclContext()->getExternCContext())
15181 Diag(LSD->getExternLoc(), diag::note_extern_c_begins_here);
15182 return true;
15183 }
15184
15185 // This might be the definition of a literal operator template.
15186 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate();
15187
15188 // This might be a specialization of a literal operator template.
15189 if (!TpDecl)
15190 TpDecl = FnDecl->getPrimaryTemplate();
15191
15192 // template <char...> type operator "" name() and
15193 // template <class T, T...> type operator "" name() are the only valid
15194 // template signatures, and the only valid signatures with no parameters.
15195 if (TpDecl) {
15196 if (FnDecl->param_size() != 0) {
15197 Diag(FnDecl->getLocation(),
15198 diag::err_literal_operator_template_with_params);
15199 return true;
15200 }
15201
15202 if (checkLiteralOperatorTemplateParameterList(*this, TpDecl))
15203 return true;
15204
15205 } else if (FnDecl->param_size() == 1) {
15206 const ParmVarDecl *Param = FnDecl->getParamDecl(0);
15207
15208 QualType ParamType = Param->getType().getUnqualifiedType();
15209
15210 // Only unsigned long long int, long double, any character type, and const
15211 // char * are allowed as the only parameters.
15212 if (ParamType->isSpecificBuiltinType(BuiltinType::ULongLong) ||
15213 ParamType->isSpecificBuiltinType(BuiltinType::LongDouble) ||
15214 Context.hasSameType(ParamType, Context.CharTy) ||
15215 Context.hasSameType(ParamType, Context.WideCharTy) ||
15216 Context.hasSameType(ParamType, Context.Char8Ty) ||
15217 Context.hasSameType(ParamType, Context.Char16Ty) ||
15218 Context.hasSameType(ParamType, Context.Char32Ty)) {
15219 } else if (const PointerType *Ptr = ParamType->getAs<PointerType>()) {
15220 QualType InnerType = Ptr->getPointeeType();
15221
15222 // Pointer parameter must be a const char *.
15223 if (!(Context.hasSameType(InnerType.getUnqualifiedType(),
15224 Context.CharTy) &&
15225 InnerType.isConstQualified() && !InnerType.isVolatileQualified())) {
15226 Diag(Param->getSourceRange().getBegin(),
15227 diag::err_literal_operator_param)
15228 << ParamType << "'const char *'" << Param->getSourceRange();
15229 return true;
15230 }
15231
15232 } else if (ParamType->isRealFloatingType()) {
15233 Diag(Param->getSourceRange().getBegin(), diag::err_literal_operator_param)
15234 << ParamType << Context.LongDoubleTy << Param->getSourceRange();
15235 return true;
15236
15237 } else if (ParamType->isIntegerType()) {
15238 Diag(Param->getSourceRange().getBegin(), diag::err_literal_operator_param)
15239 << ParamType << Context.UnsignedLongLongTy << Param->getSourceRange();
15240 return true;
15241
15242 } else {
15243 Diag(Param->getSourceRange().getBegin(),
15244 diag::err_literal_operator_invalid_param)
15245 << ParamType << Param->getSourceRange();
15246 return true;
15247 }
15248
15249 } else if (FnDecl->param_size() == 2) {
15250 FunctionDecl::param_iterator Param = FnDecl->param_begin();
15251
15252 // First, verify that the first parameter is correct.
15253
15254 QualType FirstParamType = (*Param)->getType().getUnqualifiedType();
15255
15256 // Two parameter function must have a pointer to const as a
15257 // first parameter; let's strip those qualifiers.
15258 const PointerType *PT = FirstParamType->getAs<PointerType>();
15259
15260 if (!PT) {
15261 Diag((*Param)->getSourceRange().getBegin(),
15262 diag::err_literal_operator_param)
15263 << FirstParamType << "'const char *'" << (*Param)->getSourceRange();
15264 return true;
15265 }
15266
15267 QualType PointeeType = PT->getPointeeType();
15268 // First parameter must be const
15269 if (!PointeeType.isConstQualified() || PointeeType.isVolatileQualified()) {
15270 Diag((*Param)->getSourceRange().getBegin(),
15271 diag::err_literal_operator_param)
15272 << FirstParamType << "'const char *'" << (*Param)->getSourceRange();
15273 return true;
15274 }
15275
15276 QualType InnerType = PointeeType.getUnqualifiedType();
15277 // Only const char *, const wchar_t*, const char8_t*, const char16_t*, and
15278 // const char32_t* are allowed as the first parameter to a two-parameter
15279 // function
15280 if (!(Context.hasSameType(InnerType, Context.CharTy) ||
15281 Context.hasSameType(InnerType, Context.WideCharTy) ||
15282 Context.hasSameType(InnerType, Context.Char8Ty) ||
15283 Context.hasSameType(InnerType, Context.Char16Ty) ||
15284 Context.hasSameType(InnerType, Context.Char32Ty))) {
15285 Diag((*Param)->getSourceRange().getBegin(),
15286 diag::err_literal_operator_param)
15287 << FirstParamType << "'const char *'" << (*Param)->getSourceRange();
15288 return true;
15289 }
15290
15291 // Move on to the second and final parameter.
15292 ++Param;
15293
15294 // The second parameter must be a std::size_t.
15295 QualType SecondParamType = (*Param)->getType().getUnqualifiedType();
15296 if (!Context.hasSameType(SecondParamType, Context.getSizeType())) {
15297 Diag((*Param)->getSourceRange().getBegin(),
15298 diag::err_literal_operator_param)
15299 << SecondParamType << Context.getSizeType()
15300 << (*Param)->getSourceRange();
15301 return true;
15302 }
15303 } else {
15304 Diag(FnDecl->getLocation(), diag::err_literal_operator_bad_param_count);
15305 return true;
15306 }
15307
15308 // Parameters are good.
15309
15310 // A parameter-declaration-clause containing a default argument is not
15311 // equivalent to any of the permitted forms.
15312 for (auto Param : FnDecl->parameters()) {
15313 if (Param->hasDefaultArg()) {
15314 Diag(Param->getDefaultArgRange().getBegin(),
15315 diag::err_literal_operator_default_argument)
15316 << Param->getDefaultArgRange();
15317 break;
15318 }
15319 }
15320
15321 StringRef LiteralName
15322 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName();
15323 if (LiteralName[0] != '_' &&
15324 !getSourceManager().isInSystemHeader(FnDecl->getLocation())) {
15325 // C++11 [usrlit.suffix]p1:
15326 // Literal suffix identifiers that do not start with an underscore
15327 // are reserved for future standardization.
15328 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved)
15329 << StringLiteralParser::isValidUDSuffix(getLangOpts(), LiteralName);
15330 }
15331
15332 return false;
15333}
15334
15335/// ActOnStartLinkageSpecification - Parsed the beginning of a C++
15336/// linkage specification, including the language and (if present)
15337/// the '{'. ExternLoc is the location of the 'extern', Lang is the
15338/// language string literal. LBraceLoc, if valid, provides the location of
15339/// the '{' brace. Otherwise, this linkage specification does not
15340/// have any braces.
15341Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc,
15342 Expr *LangStr,
15343 SourceLocation LBraceLoc) {
15344 StringLiteral *Lit = cast<StringLiteral>(LangStr);
15345 if (!Lit->isAscii()) {
15346 Diag(LangStr->getExprLoc(), diag::err_language_linkage_spec_not_ascii)
15347 << LangStr->getSourceRange();
15348 return nullptr;
15349 }
15350
15351 StringRef Lang = Lit->getString();
15352 LinkageSpecDecl::LanguageIDs Language;
15353 if (Lang == "C")
15354 Language = LinkageSpecDecl::lang_c;
15355 else if (Lang == "C++")
15356 Language = LinkageSpecDecl::lang_cxx;
15357 else {
15358 Diag(LangStr->getExprLoc(), diag::err_language_linkage_spec_unknown)
15359 << LangStr->getSourceRange();
15360 return nullptr;
15361 }
15362
15363 // FIXME: Add all the various semantics of linkage specifications
15364
15365 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, ExternLoc,
15366 LangStr->getExprLoc(), Language,
15367 LBraceLoc.isValid());
15368 CurContext->addDecl(D);
15369 PushDeclContext(S, D);
15370 return D;
15371}
15372
15373/// ActOnFinishLinkageSpecification - Complete the definition of
15374/// the C++ linkage specification LinkageSpec. If RBraceLoc is
15375/// valid, it's the position of the closing '}' brace in a linkage
15376/// specification that uses braces.
15377Decl *Sema::ActOnFinishLinkageSpecification(Scope *S,
15378 Decl *LinkageSpec,
15379 SourceLocation RBraceLoc) {
15380 if (RBraceLoc.isValid()) {
15381 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec);
15382 LSDecl->setRBraceLoc(RBraceLoc);
15383 }
15384 PopDeclContext();
15385 return LinkageSpec;
15386}
15387
15388Decl *Sema::ActOnEmptyDeclaration(Scope *S,
15389 const ParsedAttributesView &AttrList,
15390 SourceLocation SemiLoc) {
15391 Decl *ED = EmptyDecl::Create(Context, CurContext, SemiLoc);
15392 // Attribute declarations appertain to empty declaration so we handle
15393 // them here.
15394 ProcessDeclAttributeList(S, ED, AttrList);
15395
15396 CurContext->addDecl(ED);
15397 return ED;
15398}
15399
15400/// Perform semantic analysis for the variable declaration that
15401/// occurs within a C++ catch clause, returning the newly-created
15402/// variable.
15403VarDecl *Sema::BuildExceptionDeclaration(Scope *S,
15404 TypeSourceInfo *TInfo,
15405 SourceLocation StartLoc,
15406 SourceLocation Loc,
15407 IdentifierInfo *Name) {
15408 bool Invalid = false;
15409 QualType ExDeclType = TInfo->getType();
15410
15411 // Arrays and functions decay.
15412 if (ExDeclType->isArrayType())
15413 ExDeclType = Context.getArrayDecayedType(ExDeclType);
15414 else if (ExDeclType->isFunctionType())
15415 ExDeclType = Context.getPointerType(ExDeclType);
15416
15417 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type.
15418 // The exception-declaration shall not denote a pointer or reference to an
15419 // incomplete type, other than [cv] void*.
15420 // N2844 forbids rvalue references.
15421 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) {
15422 Diag(Loc, diag::err_catch_rvalue_ref);
15423 Invalid = true;
15424 }
15425
15426 if (ExDeclType->isVariablyModifiedType()) {
15427 Diag(Loc, diag::err_catch_variably_modified) << ExDeclType;
15428 Invalid = true;
15429 }
15430
15431 QualType BaseType = ExDeclType;
15432 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference
15433 unsigned DK = diag::err_catch_incomplete;
15434 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) {
15435 BaseType = Ptr->getPointeeType();
15436 Mode = 1;
15437 DK = diag::err_catch_incomplete_ptr;
15438 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) {
15439 // For the purpose of error recovery, we treat rvalue refs like lvalue refs.
15440 BaseType = Ref->getPointeeType();
15441 Mode = 2;
15442 DK = diag::err_catch_incomplete_ref;
15443 }
15444 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) &&
15445 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK))
15446 Invalid = true;
15447
15448 if (!Invalid && !ExDeclType->isDependentType() &&
15449 RequireNonAbstractType(Loc, ExDeclType,
15450 diag::err_abstract_type_in_decl,
15451 AbstractVariableType))
15452 Invalid = true;
15453
15454 // Only the non-fragile NeXT runtime currently supports C++ catches
15455 // of ObjC types, and no runtime supports catching ObjC types by value.
15456 if (!Invalid && getLangOpts().ObjC) {
15457 QualType T = ExDeclType;
15458 if (const ReferenceType *RT = T->getAs<ReferenceType>())
15459 T = RT->getPointeeType();
15460
15461 if (T->isObjCObjectType()) {
15462 Diag(Loc, diag::err_objc_object_catch);
15463 Invalid = true;
15464 } else if (T->isObjCObjectPointerType()) {
15465 // FIXME: should this be a test for macosx-fragile specifically?
15466 if (getLangOpts().ObjCRuntime.isFragile())
15467 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile);
15468 }
15469 }
15470
15471 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name,
15472 ExDeclType, TInfo, SC_None);
15473 ExDecl->setExceptionVariable(true);
15474
15475 // In ARC, infer 'retaining' for variables of retainable type.
15476 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl))
15477 Invalid = true;
15478
15479 if (!Invalid && !ExDeclType->isDependentType()) {
15480 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) {
15481 // Insulate this from anything else we might currently be parsing.
15482 EnterExpressionEvaluationContext scope(
15483 *this, ExpressionEvaluationContext::PotentiallyEvaluated);
15484
15485 // C++ [except.handle]p16:
15486 // The object declared in an exception-declaration or, if the
15487 // exception-declaration does not specify a name, a temporary (12.2) is
15488 // copy-initialized (8.5) from the exception object. [...]
15489 // The object is destroyed when the handler exits, after the destruction
15490 // of any automatic objects initialized within the handler.
15491 //
15492 // We just pretend to initialize the object with itself, then make sure
15493 // it can be destroyed later.
15494 QualType initType = Context.getExceptionObjectType(ExDeclType);
15495
15496 InitializedEntity entity =
15497 InitializedEntity::InitializeVariable(ExDecl);
15498 InitializationKind initKind =
15499 InitializationKind::CreateCopy(Loc, SourceLocation());
15500
15501 Expr *opaqueValue =
15502 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary);
15503 InitializationSequence sequence(*this, entity, initKind, opaqueValue);
15504 ExprResult result = sequence.Perform(*this, entity, initKind, opaqueValue);
15505 if (result.isInvalid())
15506 Invalid = true;
15507 else {
15508 // If the constructor used was non-trivial, set this as the
15509 // "initializer".
15510 CXXConstructExpr *construct = result.getAs<CXXConstructExpr>();
15511 if (!construct->getConstructor()->isTrivial()) {
15512 Expr *init = MaybeCreateExprWithCleanups(construct);
15513 ExDecl->setInit(init);
15514 }
15515
15516 // And make sure it's destructable.
15517 FinalizeVarWithDestructor(ExDecl, recordType);
15518 }
15519 }
15520 }
15521
15522 if (Invalid)
15523 ExDecl->setInvalidDecl();
15524
15525 return ExDecl;
15526}
15527
15528/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch
15529/// handler.
15530Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) {
15531 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
15532 bool Invalid = D.isInvalidType();
15533
15534 // Check for unexpanded parameter packs.
15535 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
15536 UPPC_ExceptionType)) {
15537 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy,
15538 D.getIdentifierLoc());
15539 Invalid = true;
15540 }
15541
15542 IdentifierInfo *II = D.getIdentifier();
15543 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(),
15544 LookupOrdinaryName,
15545 ForVisibleRedeclaration)) {
15546 // The scope should be freshly made just for us. There is just no way
15547 // it contains any previous declaration, except for function parameters in
15548 // a function-try-block's catch statement.
15549 assert(!S->isDeclScope(PrevDecl))((!S->isDeclScope(PrevDecl)) ? static_cast<void> (0)
: __assert_fail ("!S->isDeclScope(PrevDecl)", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 15549, __PRETTY_FUNCTION__))
;
15550 if (isDeclInScope(PrevDecl, CurContext, S)) {
15551 Diag(D.getIdentifierLoc(), diag::err_redefinition)
15552 << D.getIdentifier();
15553 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
15554 Invalid = true;
15555 } else if (PrevDecl->isTemplateParameter())
15556 // Maybe we will complain about the shadowed template parameter.
15557 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
15558 }
15559
15560 if (D.getCXXScopeSpec().isSet() && !Invalid) {
15561 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator)
15562 << D.getCXXScopeSpec().getRange();
15563 Invalid = true;
15564 }
15565
15566 VarDecl *ExDecl = BuildExceptionDeclaration(
15567 S, TInfo, D.getBeginLoc(), D.getIdentifierLoc(), D.getIdentifier());
15568 if (Invalid)
15569 ExDecl->setInvalidDecl();
15570
15571 // Add the exception declaration into this scope.
15572 if (II)
15573 PushOnScopeChains(ExDecl, S);
15574 else
15575 CurContext->addDecl(ExDecl);
15576
15577 ProcessDeclAttributes(S, ExDecl, D);
15578 return ExDecl;
15579}
15580
15581Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc,
15582 Expr *AssertExpr,
15583 Expr *AssertMessageExpr,
15584 SourceLocation RParenLoc) {
15585 StringLiteral *AssertMessage =
15586 AssertMessageExpr ? cast<StringLiteral>(AssertMessageExpr) : nullptr;
15587
15588 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression))
15589 return nullptr;
15590
15591 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr,
15592 AssertMessage, RParenLoc, false);
15593}
15594
15595Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc,
15596 Expr *AssertExpr,
15597 StringLiteral *AssertMessage,
15598 SourceLocation RParenLoc,
15599 bool Failed) {
15600 assert(AssertExpr != nullptr && "Expected non-null condition")((AssertExpr != nullptr && "Expected non-null condition"
) ? static_cast<void> (0) : __assert_fail ("AssertExpr != nullptr && \"Expected non-null condition\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 15600, __PRETTY_FUNCTION__))
;
15601 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() &&
15602 !Failed) {
15603 // In a static_assert-declaration, the constant-expression shall be a
15604 // constant expression that can be contextually converted to bool.
15605 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr);
15606 if (Converted.isInvalid())
15607 Failed = true;
15608
15609 ExprResult FullAssertExpr =
15610 ActOnFinishFullExpr(Converted.get(), StaticAssertLoc,
15611 /*DiscardedValue*/ false,
15612 /*IsConstexpr*/ true);
15613 if (FullAssertExpr.isInvalid())
15614 Failed = true;
15615 else
15616 AssertExpr = FullAssertExpr.get();
15617
15618 llvm::APSInt Cond;
15619 if (!Failed && VerifyIntegerConstantExpression(AssertExpr, &Cond,
15620 diag::err_static_assert_expression_is_not_constant,
15621 /*AllowFold=*/false).isInvalid())
15622 Failed = true;
15623
15624 if (!Failed && !Cond) {
15625 SmallString<256> MsgBuffer;
15626 llvm::raw_svector_ostream Msg(MsgBuffer);
15627 if (AssertMessage)
15628 AssertMessage->printPretty(Msg, nullptr, getPrintingPolicy());
15629
15630 Expr *InnerCond = nullptr;
15631 std::string InnerCondDescription;
15632 std::tie(InnerCond, InnerCondDescription) =
15633 findFailedBooleanCondition(Converted.get());
15634 if (InnerCond && isa<ConceptSpecializationExpr>(InnerCond)) {
15635 // Drill down into concept specialization expressions to see why they
15636 // weren't satisfied.
15637 Diag(StaticAssertLoc, diag::err_static_assert_failed)
15638 << !AssertMessage << Msg.str() << AssertExpr->getSourceRange();
15639 ConstraintSatisfaction Satisfaction;
15640 if (!CheckConstraintSatisfaction(InnerCond, Satisfaction))
15641 DiagnoseUnsatisfiedConstraint(Satisfaction);
15642 } else if (InnerCond && !isa<CXXBoolLiteralExpr>(InnerCond)
15643 && !isa<IntegerLiteral>(InnerCond)) {
15644 Diag(StaticAssertLoc, diag::err_static_assert_requirement_failed)
15645 << InnerCondDescription << !AssertMessage
15646 << Msg.str() << InnerCond->getSourceRange();
15647 } else {
15648 Diag(StaticAssertLoc, diag::err_static_assert_failed)
15649 << !AssertMessage << Msg.str() << AssertExpr->getSourceRange();
15650 }
15651 Failed = true;
15652 }
15653 } else {
15654 ExprResult FullAssertExpr = ActOnFinishFullExpr(AssertExpr, StaticAssertLoc,
15655 /*DiscardedValue*/false,
15656 /*IsConstexpr*/true);
15657 if (FullAssertExpr.isInvalid())
15658 Failed = true;
15659 else
15660 AssertExpr = FullAssertExpr.get();
15661 }
15662
15663 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc,
15664 AssertExpr, AssertMessage, RParenLoc,
15665 Failed);
15666
15667 CurContext->addDecl(Decl);
15668 return Decl;
15669}
15670
15671/// Perform semantic analysis of the given friend type declaration.
15672///
15673/// \returns A friend declaration that.
15674FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart,
15675 SourceLocation FriendLoc,
15676 TypeSourceInfo *TSInfo) {
15677 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration")((TSInfo && "NULL TypeSourceInfo for friend type declaration"
) ? static_cast<void> (0) : __assert_fail ("TSInfo && \"NULL TypeSourceInfo for friend type declaration\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 15677, __PRETTY_FUNCTION__))
;
15678
15679 QualType T = TSInfo->getType();
15680 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange();
15681
15682 // C++03 [class.friend]p2:
15683 // An elaborated-type-specifier shall be used in a friend declaration
15684 // for a class.*
15685 //
15686 // * The class-key of the elaborated-type-specifier is required.
15687 if (!CodeSynthesisContexts.empty()) {
15688 // Do not complain about the form of friend template types during any kind
15689 // of code synthesis. For template instantiation, we will have complained
15690 // when the template was defined.
15691 } else {
15692 if (!T->isElaboratedTypeSpecifier()) {
15693 // If we evaluated the type to a record type, suggest putting
15694 // a tag in front.
15695 if (const RecordType *RT = T->getAs<RecordType>()) {
15696 RecordDecl *RD = RT->getDecl();
15697
15698 SmallString<16> InsertionText(" ");
15699 InsertionText += RD->getKindName();
15700
15701 Diag(TypeRange.getBegin(),
15702 getLangOpts().CPlusPlus11 ?
15703 diag::warn_cxx98_compat_unelaborated_friend_type :
15704 diag::ext_unelaborated_friend_type)
15705 << (unsigned) RD->getTagKind()
15706 << T
15707 << FixItHint::CreateInsertion(getLocForEndOfToken(FriendLoc),
15708 InsertionText);
15709 } else {
15710 Diag(FriendLoc,
15711 getLangOpts().CPlusPlus11 ?
15712 diag::warn_cxx98_compat_nonclass_type_friend :
15713 diag::ext_nonclass_type_friend)
15714 << T
15715 << TypeRange;
15716 }
15717 } else if (T->getAs<EnumType>()) {
15718 Diag(FriendLoc,
15719 getLangOpts().CPlusPlus11 ?
15720 diag::warn_cxx98_compat_enum_friend :
15721 diag::ext_enum_friend)
15722 << T
15723 << TypeRange;
15724 }
15725
15726 // C++11 [class.friend]p3:
15727 // A friend declaration that does not declare a function shall have one
15728 // of the following forms:
15729 // friend elaborated-type-specifier ;
15730 // friend simple-type-specifier ;
15731 // friend typename-specifier ;
15732 if (getLangOpts().CPlusPlus11 && LocStart != FriendLoc)
15733 Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T;
15734 }
15735
15736 // If the type specifier in a friend declaration designates a (possibly
15737 // cv-qualified) class type, that class is declared as a friend; otherwise,
15738 // the friend declaration is ignored.
15739 return FriendDecl::Create(Context, CurContext,
15740 TSInfo->getTypeLoc().getBeginLoc(), TSInfo,
15741 FriendLoc);
15742}
15743
15744/// Handle a friend tag declaration where the scope specifier was
15745/// templated.
15746Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc,
15747 unsigned TagSpec, SourceLocation TagLoc,
15748 CXXScopeSpec &SS, IdentifierInfo *Name,
15749 SourceLocation NameLoc,
15750 const ParsedAttributesView &Attr,
15751 MultiTemplateParamsArg TempParamLists) {
15752 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
15753
15754 bool IsMemberSpecialization = false;
15755 bool Invalid = false;
15756
15757 if (TemplateParameterList *TemplateParams =
15758 MatchTemplateParametersToScopeSpecifier(
15759 TagLoc, NameLoc, SS, nullptr, TempParamLists, /*friend*/ true,
15760 IsMemberSpecialization, Invalid)) {
15761 if (TemplateParams->size() > 0) {
15762 // This is a declaration of a class template.
15763 if (Invalid)
15764 return nullptr;
15765
15766 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, SS, Name,
15767 NameLoc, Attr, TemplateParams, AS_public,
15768 /*ModulePrivateLoc=*/SourceLocation(),
15769 FriendLoc, TempParamLists.size() - 1,
15770 TempParamLists.data()).get();
15771 } else {
15772 // The "template<>" header is extraneous.
15773 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams)
15774 << TypeWithKeyword::getTagTypeKindName(Kind) << Name;
15775 IsMemberSpecialization = true;
15776 }
15777 }
15778
15779 if (Invalid) return nullptr;
15780
15781 bool isAllExplicitSpecializations = true;
15782 for (unsigned I = TempParamLists.size(); I-- > 0; ) {
15783 if (TempParamLists[I]->size()) {
15784 isAllExplicitSpecializations = false;
15785 break;
15786 }
15787 }
15788
15789 // FIXME: don't ignore attributes.
15790
15791 // If it's explicit specializations all the way down, just forget
15792 // about the template header and build an appropriate non-templated
15793 // friend. TODO: for source fidelity, remember the headers.
15794 if (isAllExplicitSpecializations) {
15795 if (SS.isEmpty()) {
15796 bool Owned = false;
15797 bool IsDependent = false;
15798 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc,
15799 Attr, AS_public,
15800 /*ModulePrivateLoc=*/SourceLocation(),
15801 MultiTemplateParamsArg(), Owned, IsDependent,
15802 /*ScopedEnumKWLoc=*/SourceLocation(),
15803 /*ScopedEnumUsesClassTag=*/false,
15804 /*UnderlyingType=*/TypeResult(),
15805 /*IsTypeSpecifier=*/false,
15806 /*IsTemplateParamOrArg=*/false);
15807 }
15808
15809 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
15810 ElaboratedTypeKeyword Keyword
15811 = TypeWithKeyword::getKeywordForTagTypeKind(Kind);
15812 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc,
15813 *Name, NameLoc);
15814 if (T.isNull())
15815 return nullptr;
15816
15817 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T);
15818 if (isa<DependentNameType>(T)) {
15819 DependentNameTypeLoc TL =
15820 TSI->getTypeLoc().castAs<DependentNameTypeLoc>();
15821 TL.setElaboratedKeywordLoc(TagLoc);
15822 TL.setQualifierLoc(QualifierLoc);
15823 TL.setNameLoc(NameLoc);
15824 } else {
15825 ElaboratedTypeLoc TL = TSI->getTypeLoc().castAs<ElaboratedTypeLoc>();
15826 TL.setElaboratedKeywordLoc(TagLoc);
15827 TL.setQualifierLoc(QualifierLoc);
15828 TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(NameLoc);
15829 }
15830
15831 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc,
15832 TSI, FriendLoc, TempParamLists);
15833 Friend->setAccess(AS_public);
15834 CurContext->addDecl(Friend);
15835 return Friend;
15836 }
15837
15838 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?")((SS.isNotEmpty() && "valid templated tag with no SS and no direct?"
) ? static_cast<void> (0) : __assert_fail ("SS.isNotEmpty() && \"valid templated tag with no SS and no direct?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 15838, __PRETTY_FUNCTION__))
;
15839
15840
15841
15842 // Handle the case of a templated-scope friend class. e.g.
15843 // template <class T> class A<T>::B;
15844 // FIXME: we don't support these right now.
15845 Diag(NameLoc, diag::warn_template_qualified_friend_unsupported)
15846 << SS.getScopeRep() << SS.getRange() << cast<CXXRecordDecl>(CurContext);
15847 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind);
15848 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name);
15849 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T);
15850 DependentNameTypeLoc TL = TSI->getTypeLoc().castAs<DependentNameTypeLoc>();
15851 TL.setElaboratedKeywordLoc(TagLoc);
15852 TL.setQualifierLoc(SS.getWithLocInContext(Context));
15853 TL.setNameLoc(NameLoc);
15854
15855 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc,
15856 TSI, FriendLoc, TempParamLists);
15857 Friend->setAccess(AS_public);
15858 Friend->setUnsupportedFriend(true);
15859 CurContext->addDecl(Friend);
15860 return Friend;
15861}
15862
15863/// Handle a friend type declaration. This works in tandem with
15864/// ActOnTag.
15865///
15866/// Notes on friend class templates:
15867///
15868/// We generally treat friend class declarations as if they were
15869/// declaring a class. So, for example, the elaborated type specifier
15870/// in a friend declaration is required to obey the restrictions of a
15871/// class-head (i.e. no typedefs in the scope chain), template
15872/// parameters are required to match up with simple template-ids, &c.
15873/// However, unlike when declaring a template specialization, it's
15874/// okay to refer to a template specialization without an empty
15875/// template parameter declaration, e.g.
15876/// friend class A<T>::B<unsigned>;
15877/// We permit this as a special case; if there are any template
15878/// parameters present at all, require proper matching, i.e.
15879/// template <> template \<class T> friend class A<int>::B;
15880Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS,
15881 MultiTemplateParamsArg TempParams) {
15882 SourceLocation Loc = DS.getBeginLoc();
15883
15884 assert(DS.isFriendSpecified())((DS.isFriendSpecified()) ? static_cast<void> (0) : __assert_fail
("DS.isFriendSpecified()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 15884, __PRETTY_FUNCTION__))
;
15885 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified)((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) ? static_cast
<void> (0) : __assert_fail ("DS.getStorageClassSpec() == DeclSpec::SCS_unspecified"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 15885, __PRETTY_FUNCTION__))
;
15886
15887 // C++ [class.friend]p3:
15888 // A friend declaration that does not declare a function shall have one of
15889 // the following forms:
15890 // friend elaborated-type-specifier ;
15891 // friend simple-type-specifier ;
15892 // friend typename-specifier ;
15893 //
15894 // Any declaration with a type qualifier does not have that form. (It's
15895 // legal to specify a qualified type as a friend, you just can't write the
15896 // keywords.)
15897 if (DS.getTypeQualifiers()) {
15898 if (DS.getTypeQualifiers() & DeclSpec::TQ_const)
15899 Diag(DS.getConstSpecLoc(), diag::err_friend_decl_spec) << "const";
15900 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile)
15901 Diag(DS.getVolatileSpecLoc(), diag::err_friend_decl_spec) << "volatile";
15902 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict)
15903 Diag(DS.getRestrictSpecLoc(), diag::err_friend_decl_spec) << "restrict";
15904 if (DS.getTypeQualifiers() & DeclSpec::TQ_atomic)
15905 Diag(DS.getAtomicSpecLoc(), diag::err_friend_decl_spec) << "_Atomic";
15906 if (DS.getTypeQualifiers() & DeclSpec::TQ_unaligned)
15907 Diag(DS.getUnalignedSpecLoc(), diag::err_friend_decl_spec) << "__unaligned";
15908 }
15909
15910 // Try to convert the decl specifier to a type. This works for
15911 // friend templates because ActOnTag never produces a ClassTemplateDecl
15912 // for a TUK_Friend.
15913 Declarator TheDeclarator(DS, DeclaratorContext::MemberContext);
15914 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S);
15915 QualType T = TSI->getType();
15916 if (TheDeclarator.isInvalidType())
15917 return nullptr;
15918
15919 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration))
15920 return nullptr;
15921
15922 // This is definitely an error in C++98. It's probably meant to
15923 // be forbidden in C++0x, too, but the specification is just
15924 // poorly written.
15925 //
15926 // The problem is with declarations like the following:
15927 // template <T> friend A<T>::foo;
15928 // where deciding whether a class C is a friend or not now hinges
15929 // on whether there exists an instantiation of A that causes
15930 // 'foo' to equal C. There are restrictions on class-heads
15931 // (which we declare (by fiat) elaborated friend declarations to
15932 // be) that makes this tractable.
15933 //
15934 // FIXME: handle "template <> friend class A<T>;", which
15935 // is possibly well-formed? Who even knows?
15936 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) {
15937 Diag(Loc, diag::err_tagless_friend_type_template)
15938 << DS.getSourceRange();
15939 return nullptr;
15940 }
15941
15942 // C++98 [class.friend]p1: A friend of a class is a function
15943 // or class that is not a member of the class . . .
15944 // This is fixed in DR77, which just barely didn't make the C++03
15945 // deadline. It's also a very silly restriction that seriously
15946 // affects inner classes and which nobody else seems to implement;
15947 // thus we never diagnose it, not even in -pedantic.
15948 //
15949 // But note that we could warn about it: it's always useless to
15950 // friend one of your own members (it's not, however, worthless to
15951 // friend a member of an arbitrary specialization of your template).
15952
15953 Decl *D;
15954 if (!TempParams.empty())
15955 D = FriendTemplateDecl::Create(Context, CurContext, Loc,
15956 TempParams,
15957 TSI,
15958 DS.getFriendSpecLoc());
15959 else
15960 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI);
15961
15962 if (!D)
15963 return nullptr;
15964
15965 D->setAccess(AS_public);
15966 CurContext->addDecl(D);
15967
15968 return D;
15969}
15970
15971NamedDecl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D,
15972 MultiTemplateParamsArg TemplateParams) {
15973 const DeclSpec &DS = D.getDeclSpec();
15974
15975 assert(DS.isFriendSpecified())((DS.isFriendSpecified()) ? static_cast<void> (0) : __assert_fail
("DS.isFriendSpecified()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 15975, __PRETTY_FUNCTION__))
;
15976 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified)((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) ? static_cast
<void> (0) : __assert_fail ("DS.getStorageClassSpec() == DeclSpec::SCS_unspecified"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 15976, __PRETTY_FUNCTION__))
;
15977
15978 SourceLocation Loc = D.getIdentifierLoc();
15979 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
15980
15981 // C++ [class.friend]p1
15982 // A friend of a class is a function or class....
15983 // Note that this sees through typedefs, which is intended.
15984 // It *doesn't* see through dependent types, which is correct
15985 // according to [temp.arg.type]p3:
15986 // If a declaration acquires a function type through a
15987 // type dependent on a template-parameter and this causes
15988 // a declaration that does not use the syntactic form of a
15989 // function declarator to have a function type, the program
15990 // is ill-formed.
15991 if (!TInfo->getType()->isFunctionType()) {
15992 Diag(Loc, diag::err_unexpected_friend);
15993
15994 // It might be worthwhile to try to recover by creating an
15995 // appropriate declaration.
15996 return nullptr;
15997 }
15998
15999 // C++ [namespace.memdef]p3
16000 // - If a friend declaration in a non-local class first declares a
16001 // class or function, the friend class or function is a member
16002 // of the innermost enclosing namespace.
16003 // - The name of the friend is not found by simple name lookup
16004 // until a matching declaration is provided in that namespace
16005 // scope (either before or after the class declaration granting
16006 // friendship).
16007 // - If a friend function is called, its name may be found by the
16008 // name lookup that considers functions from namespaces and
16009 // classes associated with the types of the function arguments.
16010 // - When looking for a prior declaration of a class or a function
16011 // declared as a friend, scopes outside the innermost enclosing
16012 // namespace scope are not considered.
16013
16014 CXXScopeSpec &SS = D.getCXXScopeSpec();
16015 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
16016 assert(NameInfo.getName())((NameInfo.getName()) ? static_cast<void> (0) : __assert_fail
("NameInfo.getName()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 16016, __PRETTY_FUNCTION__))
;
16017
16018 // Check for unexpanded parameter packs.
16019 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) ||
16020 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) ||
16021 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration))
16022 return nullptr;
16023
16024 // The context we found the declaration in, or in which we should
16025 // create the declaration.
16026 DeclContext *DC;
16027 Scope *DCScope = S;
16028 LookupResult Previous(*this, NameInfo, LookupOrdinaryName,
16029 ForExternalRedeclaration);
16030
16031 // There are five cases here.
16032 // - There's no scope specifier and we're in a local class. Only look
16033 // for functions declared in the immediately-enclosing block scope.
16034 // We recover from invalid scope qualifiers as if they just weren't there.
16035 FunctionDecl *FunctionContainingLocalClass = nullptr;
16036 if ((SS.isInvalid() || !SS.isSet()) &&
16037 (FunctionContainingLocalClass =
16038 cast<CXXRecordDecl>(CurContext)->isLocalClass())) {
16039 // C++11 [class.friend]p11:
16040 // If a friend declaration appears in a local class and the name
16041 // specified is an unqualified name, a prior declaration is
16042 // looked up without considering scopes that are outside the
16043 // innermost enclosing non-class scope. For a friend function
16044 // declaration, if there is no prior declaration, the program is
16045 // ill-formed.
16046
16047 // Find the innermost enclosing non-class scope. This is the block
16048 // scope containing the local class definition (or for a nested class,
16049 // the outer local class).
16050 DCScope = S->getFnParent();
16051
16052 // Look up the function name in the scope.
16053 Previous.clear(LookupLocalFriendName);
16054 LookupName(Previous, S, /*AllowBuiltinCreation*/false);
16055
16056 if (!Previous.empty()) {
16057 // All possible previous declarations must have the same context:
16058 // either they were declared at block scope or they are members of
16059 // one of the enclosing local classes.
16060 DC = Previous.getRepresentativeDecl()->getDeclContext();
16061 } else {
16062 // This is ill-formed, but provide the context that we would have
16063 // declared the function in, if we were permitted to, for error recovery.
16064 DC = FunctionContainingLocalClass;
16065 }
16066 adjustContextForLocalExternDecl(DC);
16067
16068 // C++ [class.friend]p6:
16069 // A function can be defined in a friend declaration of a class if and
16070 // only if the class is a non-local class (9.8), the function name is
16071 // unqualified, and the function has namespace scope.
16072 if (D.isFunctionDefinition()) {
16073 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class);
16074 }
16075
16076 // - There's no scope specifier, in which case we just go to the
16077 // appropriate scope and look for a function or function template
16078 // there as appropriate.
16079 } else if (SS.isInvalid() || !SS.isSet()) {
16080 // C++11 [namespace.memdef]p3:
16081 // If the name in a friend declaration is neither qualified nor
16082 // a template-id and the declaration is a function or an
16083 // elaborated-type-specifier, the lookup to determine whether
16084 // the entity has been previously declared shall not consider
16085 // any scopes outside the innermost enclosing namespace.
16086 bool isTemplateId =
16087 D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId;
16088
16089 // Find the appropriate context according to the above.
16090 DC = CurContext;
16091
16092 // Skip class contexts. If someone can cite chapter and verse
16093 // for this behavior, that would be nice --- it's what GCC and
16094 // EDG do, and it seems like a reasonable intent, but the spec
16095 // really only says that checks for unqualified existing
16096 // declarations should stop at the nearest enclosing namespace,
16097 // not that they should only consider the nearest enclosing
16098 // namespace.
16099 while (DC->isRecord())
16100 DC = DC->getParent();
16101
16102 DeclContext *LookupDC = DC;
16103 while (LookupDC->isTransparentContext())
16104 LookupDC = LookupDC->getParent();
16105
16106 while (true) {
16107 LookupQualifiedName(Previous, LookupDC);
16108
16109 if (!Previous.empty()) {
16110 DC = LookupDC;
16111 break;
16112 }
16113
16114 if (isTemplateId) {
16115 if (isa<TranslationUnitDecl>(LookupDC)) break;
16116 } else {
16117 if (LookupDC->isFileContext()) break;
16118 }
16119 LookupDC = LookupDC->getParent();
16120 }
16121
16122 DCScope = getScopeForDeclContext(S, DC);
16123
16124 // - There's a non-dependent scope specifier, in which case we
16125 // compute it and do a previous lookup there for a function
16126 // or function template.
16127 } else if (!SS.getScopeRep()->isDependent()) {
16128 DC = computeDeclContext(SS);
16129 if (!DC) return nullptr;
16130
16131 if (RequireCompleteDeclContext(SS, DC)) return nullptr;
16132
16133 LookupQualifiedName(Previous, DC);
16134
16135 // C++ [class.friend]p1: A friend of a class is a function or
16136 // class that is not a member of the class . . .
16137 if (DC->Equals(CurContext))
16138 Diag(DS.getFriendSpecLoc(),
16139 getLangOpts().CPlusPlus11 ?
16140 diag::warn_cxx98_compat_friend_is_member :
16141 diag::err_friend_is_member);
16142
16143 if (D.isFunctionDefinition()) {
16144 // C++ [class.friend]p6:
16145 // A function can be defined in a friend declaration of a class if and
16146 // only if the class is a non-local class (9.8), the function name is
16147 // unqualified, and the function has namespace scope.
16148 //
16149 // FIXME: We should only do this if the scope specifier names the
16150 // innermost enclosing namespace; otherwise the fixit changes the
16151 // meaning of the code.
16152 SemaDiagnosticBuilder DB
16153 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def);
16154
16155 DB << SS.getScopeRep();
16156 if (DC->isFileContext())
16157 DB << FixItHint::CreateRemoval(SS.getRange());
16158 SS.clear();
16159 }
16160
16161 // - There's a scope specifier that does not match any template
16162 // parameter lists, in which case we use some arbitrary context,
16163 // create a method or method template, and wait for instantiation.
16164 // - There's a scope specifier that does match some template
16165 // parameter lists, which we don't handle right now.
16166 } else {
16167 if (D.isFunctionDefinition()) {
16168 // C++ [class.friend]p6:
16169 // A function can be defined in a friend declaration of a class if and
16170 // only if the class is a non-local class (9.8), the function name is
16171 // unqualified, and the function has namespace scope.
16172 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def)
16173 << SS.getScopeRep();
16174 }
16175
16176 DC = CurContext;
16177 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?")((isa<CXXRecordDecl>(DC) && "friend declaration not in class?"
) ? static_cast<void> (0) : __assert_fail ("isa<CXXRecordDecl>(DC) && \"friend declaration not in class?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 16177, __PRETTY_FUNCTION__))
;
16178 }
16179
16180 if (!DC->isRecord()) {
16181 int DiagArg = -1;
16182 switch (D.getName().getKind()) {
16183 case UnqualifiedIdKind::IK_ConstructorTemplateId:
16184 case UnqualifiedIdKind::IK_ConstructorName:
16185 DiagArg = 0;
16186 break;
16187 case UnqualifiedIdKind::IK_DestructorName:
16188 DiagArg = 1;
16189 break;
16190 case UnqualifiedIdKind::IK_ConversionFunctionId:
16191 DiagArg = 2;
16192 break;
16193 case UnqualifiedIdKind::IK_DeductionGuideName:
16194 DiagArg = 3;
16195 break;
16196 case UnqualifiedIdKind::IK_Identifier:
16197 case UnqualifiedIdKind::IK_ImplicitSelfParam:
16198 case UnqualifiedIdKind::IK_LiteralOperatorId:
16199 case UnqualifiedIdKind::IK_OperatorFunctionId:
16200 case UnqualifiedIdKind::IK_TemplateId:
16201 break;
16202 }
16203 // This implies that it has to be an operator or function.
16204 if (DiagArg >= 0) {
16205 Diag(Loc, diag::err_introducing_special_friend) << DiagArg;
16206 return nullptr;
16207 }
16208 }
16209
16210 // FIXME: This is an egregious hack to cope with cases where the scope stack
16211 // does not contain the declaration context, i.e., in an out-of-line
16212 // definition of a class.
16213 Scope FakeDCScope(S, Scope::DeclScope, Diags);
16214 if (!DCScope) {
16215 FakeDCScope.setEntity(DC);
16216 DCScope = &FakeDCScope;
16217 }
16218
16219 bool AddToScope = true;
16220 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous,
16221 TemplateParams, AddToScope);
16222 if (!ND) return nullptr;
16223
16224 assert(ND->getLexicalDeclContext() == CurContext)((ND->getLexicalDeclContext() == CurContext) ? static_cast
<void> (0) : __assert_fail ("ND->getLexicalDeclContext() == CurContext"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 16224, __PRETTY_FUNCTION__))
;
16225
16226 // If we performed typo correction, we might have added a scope specifier
16227 // and changed the decl context.
16228 DC = ND->getDeclContext();
16229
16230 // Add the function declaration to the appropriate lookup tables,
16231 // adjusting the redeclarations list as necessary. We don't
16232 // want to do this yet if the friending class is dependent.
16233 //
16234 // Also update the scope-based lookup if the target context's
16235 // lookup context is in lexical scope.
16236 if (!CurContext->isDependentContext()) {
16237 DC = DC->getRedeclContext();
16238 DC->makeDeclVisibleInContext(ND);
16239 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
16240 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false);
16241 }
16242
16243 FriendDecl *FrD = FriendDecl::Create(Context, CurContext,
16244 D.getIdentifierLoc(), ND,
16245 DS.getFriendSpecLoc());
16246 FrD->setAccess(AS_public);
16247 CurContext->addDecl(FrD);
16248
16249 if (ND->isInvalidDecl()) {
16250 FrD->setInvalidDecl();
16251 } else {
16252 if (DC->isRecord()) CheckFriendAccess(ND);
16253
16254 FunctionDecl *FD;
16255 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND))
16256 FD = FTD->getTemplatedDecl();
16257 else
16258 FD = cast<FunctionDecl>(ND);
16259
16260 // C++11 [dcl.fct.default]p4: If a friend declaration specifies a
16261 // default argument expression, that declaration shall be a definition
16262 // and shall be the only declaration of the function or function
16263 // template in the translation unit.
16264 if (functionDeclHasDefaultArgument(FD)) {
16265 // We can't look at FD->getPreviousDecl() because it may not have been set
16266 // if we're in a dependent context. If the function is known to be a
16267 // redeclaration, we will have narrowed Previous down to the right decl.
16268 if (D.isRedeclaration()) {
16269 Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_redeclared);
16270 Diag(Previous.getRepresentativeDecl()->getLocation(),
16271 diag::note_previous_declaration);
16272 } else if (!D.isFunctionDefinition())
16273 Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_must_be_def);
16274 }
16275
16276 // Mark templated-scope function declarations as unsupported.
16277 if (FD->getNumTemplateParameterLists() && SS.isValid()) {
16278 Diag(FD->getLocation(), diag::warn_template_qualified_friend_unsupported)
16279 << SS.getScopeRep() << SS.getRange()
16280 << cast<CXXRecordDecl>(CurContext);
16281 FrD->setUnsupportedFriend(true);
16282 }
16283 }
16284
16285 return ND;
16286}
16287
16288void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) {
16289 AdjustDeclIfTemplate(Dcl);
16290
16291 FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(Dcl);
16292 if (!Fn) {
16293 Diag(DelLoc, diag::err_deleted_non_function);
16294 return;
16295 }
16296
16297 // Deleted function does not have a body.
16298 Fn->setWillHaveBody(false);
16299
16300 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) {
16301 // Don't consider the implicit declaration we generate for explicit
16302 // specializations. FIXME: Do not generate these implicit declarations.
16303 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization ||
16304 Prev->getPreviousDecl()) &&
16305 !Prev->isDefined()) {
16306 Diag(DelLoc, diag::err_deleted_decl_not_first);
16307 Diag(Prev->getLocation().isInvalid() ? DelLoc : Prev->getLocation(),
16308 Prev->isImplicit() ? diag::note_previous_implicit_declaration
16309 : diag::note_previous_declaration);
16310 }
16311 // If the declaration wasn't the first, we delete the function anyway for
16312 // recovery.
16313 Fn = Fn->getCanonicalDecl();
16314 }
16315
16316 // dllimport/dllexport cannot be deleted.
16317 if (const InheritableAttr *DLLAttr = getDLLAttr(Fn)) {
16318 Diag(Fn->getLocation(), diag::err_attribute_dll_deleted) << DLLAttr;
16319 Fn->setInvalidDecl();
16320 }
16321
16322 if (Fn->isDeleted())
16323 return;
16324
16325 // C++11 [basic.start.main]p3:
16326 // A program that defines main as deleted [...] is ill-formed.
16327 if (Fn->isMain())
16328 Diag(DelLoc, diag::err_deleted_main);
16329
16330 // C++11 [dcl.fct.def.delete]p4:
16331 // A deleted function is implicitly inline.
16332 Fn->setImplicitlyInline();
16333 Fn->setDeletedAsWritten();
16334
16335 // See if we're deleting a function which is already known to override a
16336 // non-deleted virtual function.
16337 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Fn)) {
16338 bool IssuedDiagnostic = false;
16339 for (const CXXMethodDecl *O : MD->overridden_methods()) {
16340 if (!(*MD->begin_overridden_methods())->isDeleted()) {
16341 if (!IssuedDiagnostic) {
16342 Diag(DelLoc, diag::err_deleted_override) << MD->getDeclName();
16343 IssuedDiagnostic = true;
16344 }
16345 Diag(O->getLocation(), diag::note_overridden_virtual_function);
16346 }
16347 }
16348 // If this function was implicitly deleted because it was defaulted,
16349 // explain why it was deleted.
16350 if (IssuedDiagnostic && MD->isDefaulted())
16351 DiagnoseDeletedDefaultedFunction(MD);
16352 }
16353}
16354
16355void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) {
16356 if (!Dcl || Dcl->isInvalidDecl())
16357 return;
16358
16359 auto *FD = dyn_cast<FunctionDecl>(Dcl);
16360 if (!FD) {
16361 if (auto *FTD = dyn_cast<FunctionTemplateDecl>(Dcl)) {
16362 if (getDefaultedFunctionKind(FTD->getTemplatedDecl()).isComparison()) {
16363 Diag(DefaultLoc, diag::err_defaulted_comparison_template);
16364 return;
16365 }
16366 }
16367
16368 Diag(DefaultLoc, diag::err_default_special_members)
16369 << getLangOpts().CPlusPlus2a;
16370 return;
16371 }
16372
16373 // Reject if this can't possibly be a defaultable function.
16374 DefaultedFunctionKind DefKind = getDefaultedFunctionKind(FD);
16375 if (!DefKind &&
16376 // A dependent function that doesn't locally look defaultable can
16377 // still instantiate to a defaultable function if it's a constructor
16378 // or assignment operator.
16379 (!FD->isDependentContext() ||
16380 (!isa<CXXConstructorDecl>(FD) &&
16381 FD->getDeclName().getCXXOverloadedOperator() != OO_Equal))) {
16382 Diag(DefaultLoc, diag::err_default_special_members)
16383 << getLangOpts().CPlusPlus2a;
16384 return;
16385 }
16386
16387 if (DefKind.isComparison() &&
16388 !isa<CXXRecordDecl>(FD->getLexicalDeclContext())) {
16389 Diag(FD->getLocation(), diag::err_defaulted_comparison_out_of_class)
16390 << (int)DefKind.asComparison();
16391 return;
16392 }
16393
16394 // Issue compatibility warning. We already warned if the operator is
16395 // 'operator<=>' when parsing the '<=>' token.
16396 if (DefKind.isComparison() &&
16397 DefKind.asComparison() != DefaultedComparisonKind::ThreeWay) {
16398 Diag(DefaultLoc, getLangOpts().CPlusPlus2a
16399 ? diag::warn_cxx17_compat_defaulted_comparison
16400 : diag::ext_defaulted_comparison);
16401 }
16402
16403 FD->setDefaulted();
16404 FD->setExplicitlyDefaulted();
16405
16406 // Defer checking functions that are defaulted in a dependent context.
16407 if (FD->isDependentContext())
16408 return;
16409
16410 // Unset that we will have a body for this function. We might not,
16411 // if it turns out to be trivial, and we don't need this marking now
16412 // that we've marked it as defaulted.
16413 FD->setWillHaveBody(false);
16414
16415 // If this definition appears within the record, do the checking when
16416 // the record is complete. This is always the case for a defaulted
16417 // comparison.
16418 if (DefKind.isComparison())
16419 return;
16420 auto *MD = cast<CXXMethodDecl>(FD);
16421
16422 const FunctionDecl *Primary = FD;
16423 if (const FunctionDecl *Pattern = FD->getTemplateInstantiationPattern())
16424 // Ask the template instantiation pattern that actually had the
16425 // '= default' on it.
16426 Primary = Pattern;
16427
16428 // If the method was defaulted on its first declaration, we will have
16429 // already performed the checking in CheckCompletedCXXClass. Such a
16430 // declaration doesn't trigger an implicit definition.
16431 if (Primary->getCanonicalDecl()->isDefaulted())
16432 return;
16433
16434 if (CheckExplicitlyDefaultedSpecialMember(MD, DefKind.asSpecialMember()))
16435 MD->setInvalidDecl();
16436 else
16437 DefineImplicitSpecialMember(*this, MD, DefaultLoc);
16438}
16439
16440static void SearchForReturnInStmt(Sema &Self, Stmt *S) {
16441 for (Stmt *SubStmt : S->children()) {
16442 if (!SubStmt)
16443 continue;
16444 if (isa<ReturnStmt>(SubStmt))
16445 Self.Diag(SubStmt->getBeginLoc(),
16446 diag::err_return_in_constructor_handler);
16447 if (!isa<Expr>(SubStmt))
16448 SearchForReturnInStmt(Self, SubStmt);
16449 }
16450}
16451
16452void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) {
16453 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) {
16454 CXXCatchStmt *Handler = TryBlock->getHandler(I);
16455 SearchForReturnInStmt(*this, Handler);
16456 }
16457}
16458
16459bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New,
16460 const CXXMethodDecl *Old) {
16461 const auto *NewFT = New->getType()->getAs<FunctionProtoType>();
16462 const auto *OldFT = Old->getType()->getAs<FunctionProtoType>();
16463
16464 if (OldFT->hasExtParameterInfos()) {
16465 for (unsigned I = 0, E = OldFT->getNumParams(); I != E; ++I)
16466 // A parameter of the overriding method should be annotated with noescape
16467 // if the corresponding parameter of the overridden method is annotated.
16468 if (OldFT->getExtParameterInfo(I).isNoEscape() &&
16469 !NewFT->getExtParameterInfo(I).isNoEscape()) {
16470 Diag(New->getParamDecl(I)->getLocation(),
16471 diag::warn_overriding_method_missing_noescape);
16472 Diag(Old->getParamDecl(I)->getLocation(),
16473 diag::note_overridden_marked_noescape);
16474 }
16475 }
16476
16477 // Virtual overrides must have the same code_seg.
16478 const auto *OldCSA = Old->getAttr<CodeSegAttr>();
16479 const auto *NewCSA = New->getAttr<CodeSegAttr>();
16480 if ((NewCSA || OldCSA) &&
16481 (!OldCSA || !NewCSA || NewCSA->getName() != OldCSA->getName())) {
16482 Diag(New->getLocation(), diag::err_mismatched_code_seg_override);
16483 Diag(Old->getLocation(), diag::note_previous_declaration);
16484 return true;
16485 }
16486
16487 CallingConv NewCC = NewFT->getCallConv(), OldCC = OldFT->getCallConv();
16488
16489 // If the calling conventions match, everything is fine
16490 if (NewCC == OldCC)
16491 return false;
16492
16493 // If the calling conventions mismatch because the new function is static,
16494 // suppress the calling convention mismatch error; the error about static
16495 // function override (err_static_overrides_virtual from
16496 // Sema::CheckFunctionDeclaration) is more clear.
16497 if (New->getStorageClass() == SC_Static)
16498 return false;
16499
16500 Diag(New->getLocation(),
16501 diag::err_conflicting_overriding_cc_attributes)
16502 << New->getDeclName() << New->getType() << Old->getType();
16503 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
16504 return true;
16505}
16506
16507bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New,
16508 const CXXMethodDecl *Old) {
16509 QualType NewTy = New->getType()->getAs<FunctionType>()->getReturnType();
16510 QualType OldTy = Old->getType()->getAs<FunctionType>()->getReturnType();
16511
16512 if (Context.hasSameType(NewTy, OldTy) ||
16513 NewTy->isDependentType() || OldTy->isDependentType())
16514 return false;
16515
16516 // Check if the return types are covariant
16517 QualType NewClassTy, OldClassTy;
16518
16519 /// Both types must be pointers or references to classes.
16520 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) {
16521 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) {
16522 NewClassTy = NewPT->getPointeeType();
16523 OldClassTy = OldPT->getPointeeType();
16524 }
16525 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) {
16526 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) {
16527 if (NewRT->getTypeClass() == OldRT->getTypeClass()) {
16528 NewClassTy = NewRT->getPointeeType();
16529 OldClassTy = OldRT->getPointeeType();
16530 }
16531 }
16532 }
16533
16534 // The return types aren't either both pointers or references to a class type.
16535 if (NewClassTy.isNull()) {
16536 Diag(New->getLocation(),
16537 diag::err_different_return_type_for_overriding_virtual_function)
16538 << New->getDeclName() << NewTy << OldTy
16539 << New->getReturnTypeSourceRange();
16540 Diag(Old->getLocation(), diag::note_overridden_virtual_function)
16541 << Old->getReturnTypeSourceRange();
16542
16543 return true;
16544 }
16545
16546 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) {
16547 // C++14 [class.virtual]p8:
16548 // If the class type in the covariant return type of D::f differs from
16549 // that of B::f, the class type in the return type of D::f shall be
16550 // complete at the point of declaration of D::f or shall be the class
16551 // type D.
16552 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) {
16553 if (!RT->isBeingDefined() &&
16554 RequireCompleteType(New->getLocation(), NewClassTy,
16555 diag::err_covariant_return_incomplete,
16556 New->getDeclName()))
16557 return true;
16558 }
16559
16560 // Check if the new class derives from the old class.
16561 if (!IsDerivedFrom(New->getLocation(), NewClassTy, OldClassTy)) {
16562 Diag(New->getLocation(), diag::err_covariant_return_not_derived)
16563 << New->getDeclName() << NewTy << OldTy
16564 << New->getReturnTypeSourceRange();
16565 Diag(Old->getLocation(), diag::note_overridden_virtual_function)
16566 << Old->getReturnTypeSourceRange();
16567 return true;
16568 }
16569
16570 // Check if we the conversion from derived to base is valid.
16571 if (CheckDerivedToBaseConversion(
16572 NewClassTy, OldClassTy,
16573 diag::err_covariant_return_inaccessible_base,
16574 diag::err_covariant_return_ambiguous_derived_to_base_conv,
16575 New->getLocation(), New->getReturnTypeSourceRange(),
16576 New->getDeclName(), nullptr)) {
16577 // FIXME: this note won't trigger for delayed access control
16578 // diagnostics, and it's impossible to get an undelayed error
16579 // here from access control during the original parse because
16580 // the ParsingDeclSpec/ParsingDeclarator are still in scope.
16581 Diag(Old->getLocation(), diag::note_overridden_virtual_function)
16582 << Old->getReturnTypeSourceRange();
16583 return true;
16584 }
16585 }
16586
16587 // The qualifiers of the return types must be the same.
16588 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) {
16589 Diag(New->getLocation(),
16590 diag::err_covariant_return_type_different_qualifications)
16591 << New->getDeclName() << NewTy << OldTy
16592 << New->getReturnTypeSourceRange();
16593 Diag(Old->getLocation(), diag::note_overridden_virtual_function)
16594 << Old->getReturnTypeSourceRange();
16595 return true;
16596 }
16597
16598
16599 // The new class type must have the same or less qualifiers as the old type.
16600 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) {
16601 Diag(New->getLocation(),
16602 diag::err_covariant_return_type_class_type_more_qualified)
16603 << New->getDeclName() << NewTy << OldTy
16604 << New->getReturnTypeSourceRange();
16605 Diag(Old->getLocation(), diag::note_overridden_virtual_function)
16606 << Old->getReturnTypeSourceRange();
16607 return true;
16608 }
16609
16610 return false;
16611}
16612
16613/// Mark the given method pure.
16614///
16615/// \param Method the method to be marked pure.
16616///
16617/// \param InitRange the source range that covers the "0" initializer.
16618bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) {
16619 SourceLocation EndLoc = InitRange.getEnd();
16620 if (EndLoc.isValid())
16621 Method->setRangeEnd(EndLoc);
16622
16623 if (Method->isVirtual() || Method->getParent()->isDependentContext()) {
16624 Method->setPure();
16625 return false;
16626 }
16627
16628 if (!Method->isInvalidDecl())
16629 Diag(Method->getLocation(), diag::err_non_virtual_pure)
16630 << Method->getDeclName() << InitRange;
16631 return true;
16632}
16633
16634void Sema::ActOnPureSpecifier(Decl *D, SourceLocation ZeroLoc) {
16635 if (D->getFriendObjectKind())
16636 Diag(D->getLocation(), diag::err_pure_friend);
16637 else if (auto *M = dyn_cast<CXXMethodDecl>(D))
16638 CheckPureMethod(M, ZeroLoc);
16639 else
16640 Diag(D->getLocation(), diag::err_illegal_initializer);
16641}
16642
16643/// Determine whether the given declaration is a global variable or
16644/// static data member.
16645static bool isNonlocalVariable(const Decl *D) {
16646 if (const VarDecl *Var = dyn_cast_or_null<VarDecl>(D))
16647 return Var->hasGlobalStorage();
16648
16649 return false;
16650}
16651
16652/// Invoked when we are about to parse an initializer for the declaration
16653/// 'Dcl'.
16654///
16655/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a
16656/// static data member of class X, names should be looked up in the scope of
16657/// class X. If the declaration had a scope specifier, a scope will have
16658/// been created and passed in for this purpose. Otherwise, S will be null.
16659void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) {
16660 // If there is no declaration, there was an error parsing it.
16661 if (!D || D->isInvalidDecl())
16662 return;
16663
16664 // We will always have a nested name specifier here, but this declaration
16665 // might not be out of line if the specifier names the current namespace:
16666 // extern int n;
16667 // int ::n = 0;
16668 if (S && D->isOutOfLine())
16669 EnterDeclaratorContext(S, D->getDeclContext());
16670
16671 // If we are parsing the initializer for a static data member, push a
16672 // new expression evaluation context that is associated with this static
16673 // data member.
16674 if (isNonlocalVariable(D))
16675 PushExpressionEvaluationContext(
16676 ExpressionEvaluationContext::PotentiallyEvaluated, D);
16677}
16678
16679/// Invoked after we are finished parsing an initializer for the declaration D.
16680void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) {
16681 // If there is no declaration, there was an error parsing it.
16682 if (!D || D->isInvalidDecl())
16683 return;
16684
16685 if (isNonlocalVariable(D))
16686 PopExpressionEvaluationContext();
16687
16688 if (S && D->isOutOfLine())
16689 ExitDeclaratorContext(S);
16690}
16691
16692/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a
16693/// C++ if/switch/while/for statement.
16694/// e.g: "if (int x = f()) {...}"
16695DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) {
16696 // C++ 6.4p2:
16697 // The declarator shall not specify a function or an array.
16698 // The type-specifier-seq shall not contain typedef and shall not declare a
16699 // new class or enumeration.
16700 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&((D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef
&& "Parser allowed 'typedef' as storage class of condition decl."
) ? static_cast<void> (0) : __assert_fail ("D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && \"Parser allowed 'typedef' as storage class of condition decl.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 16701, __PRETTY_FUNCTION__))
16701 "Parser allowed 'typedef' as storage class of condition decl.")((D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef
&& "Parser allowed 'typedef' as storage class of condition decl."
) ? static_cast<void> (0) : __assert_fail ("D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && \"Parser allowed 'typedef' as storage class of condition decl.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 16701, __PRETTY_FUNCTION__))
;
16702
16703 Decl *Dcl = ActOnDeclarator(S, D);
16704 if (!Dcl)
16705 return true;
16706
16707 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function.
16708 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type)
16709 << D.getSourceRange();
16710 return true;
16711 }
16712
16713 return Dcl;
16714}
16715
16716void Sema::LoadExternalVTableUses() {
16717 if (!ExternalSource)
16718 return;
16719
16720 SmallVector<ExternalVTableUse, 4> VTables;
16721 ExternalSource->ReadUsedVTables(VTables);
16722 SmallVector<VTableUse, 4> NewUses;
16723 for (unsigned I = 0, N = VTables.size(); I != N; ++I) {
16724 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos
16725 = VTablesUsed.find(VTables[I].Record);
16726 // Even if a definition wasn't required before, it may be required now.
16727 if (Pos != VTablesUsed.end()) {
16728 if (!Pos->second && VTables[I].DefinitionRequired)
16729 Pos->second = true;
16730 continue;
16731 }
16732
16733 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired;
16734 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location));
16735 }
16736
16737 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end());
16738}
16739
16740void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class,
16741 bool DefinitionRequired) {
16742 // Ignore any vtable uses in unevaluated operands or for classes that do
16743 // not have a vtable.
16744 if (!Class->isDynamicClass() || Class->isDependentContext() ||
16745 CurContext->isDependentContext() || isUnevaluatedContext())
16746 return;
16747 // Do not mark as used if compiling for the device outside of the target
16748 // region.
16749 if (LangOpts.OpenMP && LangOpts.OpenMPIsDevice &&
16750 !isInOpenMPDeclareTargetContext() &&
16751 !isInOpenMPTargetExecutionDirective()) {
16752 if (!DefinitionRequired)
16753 MarkVirtualMembersReferenced(Loc, Class);
16754 return;
16755 }
16756
16757 // Try to insert this class into the map.
16758 LoadExternalVTableUses();
16759 Class = Class->getCanonicalDecl();
16760 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool>
16761 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired));
16762 if (!Pos.second) {
16763 // If we already had an entry, check to see if we are promoting this vtable
16764 // to require a definition. If so, we need to reappend to the VTableUses
16765 // list, since we may have already processed the first entry.
16766 if (DefinitionRequired && !Pos.first->second) {
16767 Pos.first->second = true;
16768 } else {
16769 // Otherwise, we can early exit.
16770 return;
16771 }
16772 } else {
16773 // The Microsoft ABI requires that we perform the destructor body
16774 // checks (i.e. operator delete() lookup) when the vtable is marked used, as
16775 // the deleting destructor is emitted with the vtable, not with the
16776 // destructor definition as in the Itanium ABI.
16777 if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
16778 CXXDestructorDecl *DD = Class->getDestructor();
16779 if (DD && DD->isVirtual() && !DD->isDeleted()) {
16780 if (Class->hasUserDeclaredDestructor() && !DD->isDefined()) {
16781 // If this is an out-of-line declaration, marking it referenced will
16782 // not do anything. Manually call CheckDestructor to look up operator
16783 // delete().
16784 ContextRAII SavedContext(*this, DD);
16785 CheckDestructor(DD);
16786 } else {
16787 MarkFunctionReferenced(Loc, Class->getDestructor());
16788 }
16789 }
16790 }
16791 }
16792
16793 // Local classes need to have their virtual members marked
16794 // immediately. For all other classes, we mark their virtual members
16795 // at the end of the translation unit.
16796 if (Class->isLocalClass())
16797 MarkVirtualMembersReferenced(Loc, Class);
16798 else
16799 VTableUses.push_back(std::make_pair(Class, Loc));
16800}
16801
16802bool Sema::DefineUsedVTables() {
16803 LoadExternalVTableUses();
16804 if (VTableUses.empty())
16805 return false;
16806
16807 // Note: The VTableUses vector could grow as a result of marking
16808 // the members of a class as "used", so we check the size each
16809 // time through the loop and prefer indices (which are stable) to
16810 // iterators (which are not).
16811 bool DefinedAnything = false;
16812 for (unsigned I = 0; I != VTableUses.size(); ++I) {
16813 CXXRecordDecl *Class = VTableUses[I].first->getDefinition();
16814 if (!Class)
16815 continue;
16816 TemplateSpecializationKind ClassTSK =
16817 Class->getTemplateSpecializationKind();
16818
16819 SourceLocation Loc = VTableUses[I].second;
16820
16821 bool DefineVTable = true;
16822
16823 // If this class has a key function, but that key function is
16824 // defined in another translation unit, we don't need to emit the
16825 // vtable even though we're using it.
16826 const CXXMethodDecl *KeyFunction = Context.getCurrentKeyFunction(Class);
16827 if (KeyFunction && !KeyFunction->hasBody()) {
16828 // The key function is in another translation unit.
16829 DefineVTable = false;
16830 TemplateSpecializationKind TSK =
16831 KeyFunction->getTemplateSpecializationKind();
16832 assert(TSK != TSK_ExplicitInstantiationDefinition &&((TSK != TSK_ExplicitInstantiationDefinition && TSK !=
TSK_ImplicitInstantiation && "Instantiations don't have key functions"
) ? static_cast<void> (0) : __assert_fail ("TSK != TSK_ExplicitInstantiationDefinition && TSK != TSK_ImplicitInstantiation && \"Instantiations don't have key functions\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 16834, __PRETTY_FUNCTION__))
16833 TSK != TSK_ImplicitInstantiation &&((TSK != TSK_ExplicitInstantiationDefinition && TSK !=
TSK_ImplicitInstantiation && "Instantiations don't have key functions"
) ? static_cast<void> (0) : __assert_fail ("TSK != TSK_ExplicitInstantiationDefinition && TSK != TSK_ImplicitInstantiation && \"Instantiations don't have key functions\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 16834, __PRETTY_FUNCTION__))
16834 "Instantiations don't have key functions")((TSK != TSK_ExplicitInstantiationDefinition && TSK !=
TSK_ImplicitInstantiation && "Instantiations don't have key functions"
) ? static_cast<void> (0) : __assert_fail ("TSK != TSK_ExplicitInstantiationDefinition && TSK != TSK_ImplicitInstantiation && \"Instantiations don't have key functions\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 16834, __PRETTY_FUNCTION__))
;
16835 (void)TSK;
16836 } else if (!KeyFunction) {
16837 // If we have a class with no key function that is the subject
16838 // of an explicit instantiation declaration, suppress the
16839 // vtable; it will live with the explicit instantiation
16840 // definition.
16841 bool IsExplicitInstantiationDeclaration =
16842 ClassTSK == TSK_ExplicitInstantiationDeclaration;
16843 for (auto R : Class->redecls()) {
16844 TemplateSpecializationKind TSK
16845 = cast<CXXRecordDecl>(R)->getTemplateSpecializationKind();
16846 if (TSK == TSK_ExplicitInstantiationDeclaration)
16847 IsExplicitInstantiationDeclaration = true;
16848 else if (TSK == TSK_ExplicitInstantiationDefinition) {
16849 IsExplicitInstantiationDeclaration = false;
16850 break;
16851 }
16852 }
16853
16854 if (IsExplicitInstantiationDeclaration)
16855 DefineVTable = false;
16856 }
16857
16858 // The exception specifications for all virtual members may be needed even
16859 // if we are not providing an authoritative form of the vtable in this TU.
16860 // We may choose to emit it available_externally anyway.
16861 if (!DefineVTable) {
16862 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class);
16863 continue;
16864 }
16865
16866 // Mark all of the virtual members of this class as referenced, so
16867 // that we can build a vtable. Then, tell the AST consumer that a
16868 // vtable for this class is required.
16869 DefinedAnything = true;
16870 MarkVirtualMembersReferenced(Loc, Class);
16871 CXXRecordDecl *Canonical = Class->getCanonicalDecl();
16872 if (VTablesUsed[Canonical])
16873 Consumer.HandleVTable(Class);
16874
16875 // Warn if we're emitting a weak vtable. The vtable will be weak if there is
16876 // no key function or the key function is inlined. Don't warn in C++ ABIs
16877 // that lack key functions, since the user won't be able to make one.
16878 if (Context.getTargetInfo().getCXXABI().hasKeyFunctions() &&
16879 Class->isExternallyVisible() && ClassTSK != TSK_ImplicitInstantiation) {
16880 const FunctionDecl *KeyFunctionDef = nullptr;
16881 if (!KeyFunction || (KeyFunction->hasBody(KeyFunctionDef) &&
16882 KeyFunctionDef->isInlined())) {
16883 Diag(Class->getLocation(),
16884 ClassTSK == TSK_ExplicitInstantiationDefinition
16885 ? diag::warn_weak_template_vtable
16886 : diag::warn_weak_vtable)
16887 << Class;
16888 }
16889 }
16890 }
16891 VTableUses.clear();
16892
16893 return DefinedAnything;
16894}
16895
16896void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc,
16897 const CXXRecordDecl *RD) {
16898 for (const auto *I : RD->methods())
16899 if (I->isVirtual() && !I->isPure())
16900 ResolveExceptionSpec(Loc, I->getType()->castAs<FunctionProtoType>());
16901}
16902
16903void Sema::MarkVirtualMembersReferenced(SourceLocation Loc,
16904 const CXXRecordDecl *RD,
16905 bool ConstexprOnly) {
16906 // Mark all functions which will appear in RD's vtable as used.
16907 CXXFinalOverriderMap FinalOverriders;
16908 RD->getFinalOverriders(FinalOverriders);
16909 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(),
16910 E = FinalOverriders.end();
16911 I != E; ++I) {
16912 for (OverridingMethods::const_iterator OI = I->second.begin(),
16913 OE = I->second.end();
16914 OI != OE; ++OI) {
16915 assert(OI->second.size() > 0 && "no final overrider")((OI->second.size() > 0 && "no final overrider"
) ? static_cast<void> (0) : __assert_fail ("OI->second.size() > 0 && \"no final overrider\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 16915, __PRETTY_FUNCTION__))
;
16916 CXXMethodDecl *Overrider = OI->second.front().Method;
16917
16918 // C++ [basic.def.odr]p2:
16919 // [...] A virtual member function is used if it is not pure. [...]
16920 if (!Overrider->isPure() && (!ConstexprOnly || Overrider->isConstexpr()))
16921 MarkFunctionReferenced(Loc, Overrider);
16922 }
16923 }
16924
16925 // Only classes that have virtual bases need a VTT.
16926 if (RD->getNumVBases() == 0)
16927 return;
16928
16929 for (const auto &I : RD->bases()) {
16930 const auto *Base =
16931 cast<CXXRecordDecl>(I.getType()->castAs<RecordType>()->getDecl());
16932 if (Base->getNumVBases() == 0)
16933 continue;
16934 MarkVirtualMembersReferenced(Loc, Base);
16935 }
16936}
16937
16938/// SetIvarInitializers - This routine builds initialization ASTs for the
16939/// Objective-C implementation whose ivars need be initialized.
16940void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) {
16941 if (!getLangOpts().CPlusPlus)
16942 return;
16943 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) {
16944 SmallVector<ObjCIvarDecl*, 8> ivars;
16945 CollectIvarsToConstructOrDestruct(OID, ivars);
16946 if (ivars.empty())
16947 return;
16948 SmallVector<CXXCtorInitializer*, 32> AllToInit;
16949 for (unsigned i = 0; i < ivars.size(); i++) {
16950 FieldDecl *Field = ivars[i];
16951 if (Field->isInvalidDecl())
16952 continue;
16953
16954 CXXCtorInitializer *Member;
16955 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field);
16956 InitializationKind InitKind =
16957 InitializationKind::CreateDefault(ObjCImplementation->getLocation());
16958
16959 InitializationSequence InitSeq(*this, InitEntity, InitKind, None);
16960 ExprResult MemberInit =
16961 InitSeq.Perform(*this, InitEntity, InitKind, None);
16962 MemberInit = MaybeCreateExprWithCleanups(MemberInit);
16963 // Note, MemberInit could actually come back empty if no initialization
16964 // is required (e.g., because it would call a trivial default constructor)
16965 if (!MemberInit.get() || MemberInit.isInvalid())
16966 continue;
16967
16968 Member =
16969 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(),
16970 SourceLocation(),
16971 MemberInit.getAs<Expr>(),
16972 SourceLocation());
16973 AllToInit.push_back(Member);
16974
16975 // Be sure that the destructor is accessible and is marked as referenced.
16976 if (const RecordType *RecordTy =
16977 Context.getBaseElementType(Field->getType())
16978 ->getAs<RecordType>()) {
16979 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl());
16980 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) {
16981 MarkFunctionReferenced(Field->getLocation(), Destructor);
16982 CheckDestructorAccess(Field->getLocation(), Destructor,
16983 PDiag(diag::err_access_dtor_ivar)
16984 << Context.getBaseElementType(Field->getType()));
16985 }
16986 }
16987 }
16988 ObjCImplementation->setIvarInitializers(Context,
16989 AllToInit.data(), AllToInit.size());
16990 }
16991}
16992
16993static
16994void DelegatingCycleHelper(CXXConstructorDecl* Ctor,
16995 llvm::SmallPtrSet<CXXConstructorDecl*, 4> &Valid,
16996 llvm::SmallPtrSet<CXXConstructorDecl*, 4> &Invalid,
16997 llvm::SmallPtrSet<CXXConstructorDecl*, 4> &Current,
16998 Sema &S) {
16999 if (Ctor->isInvalidDecl())
17000 return;
17001
17002 CXXConstructorDecl *Target = Ctor->getTargetConstructor();
17003
17004 // Target may not be determinable yet, for instance if this is a dependent
17005 // call in an uninstantiated template.
17006 if (Target) {
17007 const FunctionDecl *FNTarget = nullptr;
17008 (void)Target->hasBody(FNTarget);
17009 Target = const_cast<CXXConstructorDecl*>(
17010 cast_or_null<CXXConstructorDecl>(FNTarget));
17011 }
17012
17013 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(),
17014 // Avoid dereferencing a null pointer here.
17015 *TCanonical = Target? Target->getCanonicalDecl() : nullptr;
17016
17017 if (!Current.insert(Canonical).second)
17018 return;
17019
17020 // We know that beyond here, we aren't chaining into a cycle.
17021 if (!Target || !Target->isDelegatingConstructor() ||
17022 Target->isInvalidDecl() || Valid.count(TCanonical)) {
17023 Valid.insert(Current.begin(), Current.end());
17024 Current.clear();
17025 // We've hit a cycle.
17026 } else if (TCanonical == Canonical || Invalid.count(TCanonical) ||
17027 Current.count(TCanonical)) {
17028 // If we haven't diagnosed this cycle yet, do so now.
17029 if (!Invalid.count(TCanonical)) {
17030 S.Diag((*Ctor->init_begin())->getSourceLocation(),
17031 diag::warn_delegating_ctor_cycle)
17032 << Ctor;
17033
17034 // Don't add a note for a function delegating directly to itself.
17035 if (TCanonical != Canonical)
17036 S.Diag(Target->getLocation(), diag::note_it_delegates_to);
17037
17038 CXXConstructorDecl *C = Target;
17039 while (C->getCanonicalDecl() != Canonical) {
17040 const FunctionDecl *FNTarget = nullptr;
17041 (void)C->getTargetConstructor()->hasBody(FNTarget);
17042 assert(FNTarget && "Ctor cycle through bodiless function")((FNTarget && "Ctor cycle through bodiless function")
? static_cast<void> (0) : __assert_fail ("FNTarget && \"Ctor cycle through bodiless function\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 17042, __PRETTY_FUNCTION__))
;
17043
17044 C = const_cast<CXXConstructorDecl*>(
17045 cast<CXXConstructorDecl>(FNTarget));
17046 S.Diag(C->getLocation(), diag::note_which_delegates_to);
17047 }
17048 }
17049
17050 Invalid.insert(Current.begin(), Current.end());
17051 Current.clear();
17052 } else {
17053 DelegatingCycleHelper(Target, Valid, Invalid, Current, S);
17054 }
17055}
17056
17057
17058void Sema::CheckDelegatingCtorCycles() {
17059 llvm::SmallPtrSet<CXXConstructorDecl*, 4> Valid, Invalid, Current;
17060
17061 for (DelegatingCtorDeclsType::iterator
17062 I = DelegatingCtorDecls.begin(ExternalSource),
17063 E = DelegatingCtorDecls.end();
17064 I != E; ++I)
17065 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this);
17066
17067 for (auto CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI)
17068 (*CI)->setInvalidDecl();
17069}
17070
17071namespace {
17072 /// AST visitor that finds references to the 'this' expression.
17073 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> {
17074 Sema &S;
17075
17076 public:
17077 explicit FindCXXThisExpr(Sema &S) : S(S) { }
17078
17079 bool VisitCXXThisExpr(CXXThisExpr *E) {
17080 S.Diag(E->getLocation(), diag::err_this_static_member_func)
17081 << E->isImplicit();
17082 return false;
17083 }
17084 };
17085}
17086
17087bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) {
17088 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo();
17089 if (!TSInfo)
17090 return false;
17091
17092 TypeLoc TL = TSInfo->getTypeLoc();
17093 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>();
17094 if (!ProtoTL)
17095 return false;
17096
17097 // C++11 [expr.prim.general]p3:
17098 // [The expression this] shall not appear before the optional
17099 // cv-qualifier-seq and it shall not appear within the declaration of a
17100 // static member function (although its type and value category are defined
17101 // within a static member function as they are within a non-static member
17102 // function). [ Note: this is because declaration matching does not occur
17103 // until the complete declarator is known. - end note ]
17104 const FunctionProtoType *Proto = ProtoTL.getTypePtr();
17105 FindCXXThisExpr Finder(*this);
17106
17107 // If the return type came after the cv-qualifier-seq, check it now.
17108 if (Proto->hasTrailingReturn() &&
17109 !Finder.TraverseTypeLoc(ProtoTL.getReturnLoc()))
17110 return true;
17111
17112 // Check the exception specification.
17113 if (checkThisInStaticMemberFunctionExceptionSpec(Method))
17114 return true;
17115
17116 // Check the trailing requires clause
17117 if (Expr *E = Method->getTrailingRequiresClause())
17118 if (!Finder.TraverseStmt(E))
17119 return true;
17120
17121 return checkThisInStaticMemberFunctionAttributes(Method);
17122}
17123
17124bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) {
17125 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo();
17126 if (!TSInfo)
17127 return false;
17128
17129 TypeLoc TL = TSInfo->getTypeLoc();
17130 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>();
17131 if (!ProtoTL)
17132 return false;
17133
17134 const FunctionProtoType *Proto = ProtoTL.getTypePtr();
17135 FindCXXThisExpr Finder(*this);
17136
17137 switch (Proto->getExceptionSpecType()) {
17138 case EST_Unparsed:
17139 case EST_Uninstantiated:
17140 case EST_Unevaluated:
17141 case EST_BasicNoexcept:
17142 case EST_NoThrow:
17143 case EST_DynamicNone:
17144 case EST_MSAny:
17145 case EST_None:
17146 break;
17147
17148 case EST_DependentNoexcept:
17149 case EST_NoexceptFalse:
17150 case EST_NoexceptTrue:
17151 if (!Finder.TraverseStmt(Proto->getNoexceptExpr()))
17152 return true;
17153 LLVM_FALLTHROUGH[[gnu::fallthrough]];
17154
17155 case EST_Dynamic:
17156 for (const auto &E : Proto->exceptions()) {
17157 if (!Finder.TraverseType(E))
17158 return true;
17159 }
17160 break;
17161 }
17162
17163 return false;
17164}
17165
17166bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) {
17167 FindCXXThisExpr Finder(*this);
17168
17169 // Check attributes.
17170 for (const auto *A : Method->attrs()) {
17171 // FIXME: This should be emitted by tblgen.
17172 Expr *Arg = nullptr;
17173 ArrayRef<Expr *> Args;
17174 if (const auto *G = dyn_cast<GuardedByAttr>(A))
17175 Arg = G->getArg();
17176 else if (const auto *G = dyn_cast<PtGuardedByAttr>(A))
17177 Arg = G->getArg();
17178 else if (const auto *AA = dyn_cast<AcquiredAfterAttr>(A))
17179 Args = llvm::makeArrayRef(AA->args_begin(), AA->args_size());
17180 else if (const auto *AB = dyn_cast<AcquiredBeforeAttr>(A))
17181 Args = llvm::makeArrayRef(AB->args_begin(), AB->args_size());
17182 else if (const auto *ETLF = dyn_cast<ExclusiveTrylockFunctionAttr>(A)) {
17183 Arg = ETLF->getSuccessValue();
17184 Args = llvm::makeArrayRef(ETLF->args_begin(), ETLF->args_size());
17185 } else if (const auto *STLF = dyn_cast<SharedTrylockFunctionAttr>(A)) {
17186 Arg = STLF->getSuccessValue();
17187 Args = llvm::makeArrayRef(STLF->args_begin(), STLF->args_size());
17188 } else if (const auto *LR = dyn_cast<LockReturnedAttr>(A))
17189 Arg = LR->getArg();
17190 else if (const auto *LE = dyn_cast<LocksExcludedAttr>(A))
17191 Args = llvm::makeArrayRef(LE->args_begin(), LE->args_size());
17192 else if (const auto *RC = dyn_cast<RequiresCapabilityAttr>(A))
17193 Args = llvm::makeArrayRef(RC->args_begin(), RC->args_size());
17194 else if (const auto *AC = dyn_cast<AcquireCapabilityAttr>(A))
17195 Args = llvm::makeArrayRef(AC->args_begin(), AC->args_size());
17196 else if (const auto *AC = dyn_cast<TryAcquireCapabilityAttr>(A))
17197 Args = llvm::makeArrayRef(AC->args_begin(), AC->args_size());
17198 else if (const auto *RC = dyn_cast<ReleaseCapabilityAttr>(A))
17199 Args = llvm::makeArrayRef(RC->args_begin(), RC->args_size());
17200
17201 if (Arg && !Finder.TraverseStmt(Arg))
17202 return true;
17203
17204 for (unsigned I = 0, N = Args.size(); I != N; ++I) {
17205 if (!Finder.TraverseStmt(Args[I]))
17206 return true;
17207 }
17208 }
17209
17210 return false;
17211}
17212
17213void Sema::checkExceptionSpecification(
17214 bool IsTopLevel, ExceptionSpecificationType EST,
17215 ArrayRef<ParsedType> DynamicExceptions,
17216 ArrayRef<SourceRange> DynamicExceptionRanges, Expr *NoexceptExpr,
17217 SmallVectorImpl<QualType> &Exceptions,
17218 FunctionProtoType::ExceptionSpecInfo &ESI) {
17219 Exceptions.clear();
17220 ESI.Type = EST;
17221 if (EST == EST_Dynamic) {
17222 Exceptions.reserve(DynamicExceptions.size());
17223 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) {
17224 // FIXME: Preserve type source info.
17225 QualType ET = GetTypeFromParser(DynamicExceptions[ei]);
17226
17227 if (IsTopLevel) {
17228 SmallVector<UnexpandedParameterPack, 2> Unexpanded;
17229 collectUnexpandedParameterPacks(ET, Unexpanded);
17230 if (!Unexpanded.empty()) {
17231 DiagnoseUnexpandedParameterPacks(
17232 DynamicExceptionRanges[ei].getBegin(), UPPC_ExceptionType,
17233 Unexpanded);
17234 continue;
17235 }
17236 }
17237
17238 // Check that the type is valid for an exception spec, and
17239 // drop it if not.
17240 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei]))
17241 Exceptions.push_back(ET);
17242 }
17243 ESI.Exceptions = Exceptions;
17244 return;
17245 }
17246
17247 if (isComputedNoexcept(EST)) {
17248 assert((NoexceptExpr->isTypeDependent() ||(((NoexceptExpr->isTypeDependent() || NoexceptExpr->getType
()->getCanonicalTypeUnqualified() == Context.BoolTy) &&
"Parser should have made sure that the expression is boolean"
) ? static_cast<void> (0) : __assert_fail ("(NoexceptExpr->isTypeDependent() || NoexceptExpr->getType()->getCanonicalTypeUnqualified() == Context.BoolTy) && \"Parser should have made sure that the expression is boolean\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 17251, __PRETTY_FUNCTION__))
17249 NoexceptExpr->getType()->getCanonicalTypeUnqualified() ==(((NoexceptExpr->isTypeDependent() || NoexceptExpr->getType
()->getCanonicalTypeUnqualified() == Context.BoolTy) &&
"Parser should have made sure that the expression is boolean"
) ? static_cast<void> (0) : __assert_fail ("(NoexceptExpr->isTypeDependent() || NoexceptExpr->getType()->getCanonicalTypeUnqualified() == Context.BoolTy) && \"Parser should have made sure that the expression is boolean\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 17251, __PRETTY_FUNCTION__))
17250 Context.BoolTy) &&(((NoexceptExpr->isTypeDependent() || NoexceptExpr->getType
()->getCanonicalTypeUnqualified() == Context.BoolTy) &&
"Parser should have made sure that the expression is boolean"
) ? static_cast<void> (0) : __assert_fail ("(NoexceptExpr->isTypeDependent() || NoexceptExpr->getType()->getCanonicalTypeUnqualified() == Context.BoolTy) && \"Parser should have made sure that the expression is boolean\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 17251, __PRETTY_FUNCTION__))
17251 "Parser should have made sure that the expression is boolean")(((NoexceptExpr->isTypeDependent() || NoexceptExpr->getType
()->getCanonicalTypeUnqualified() == Context.BoolTy) &&
"Parser should have made sure that the expression is boolean"
) ? static_cast<void> (0) : __assert_fail ("(NoexceptExpr->isTypeDependent() || NoexceptExpr->getType()->getCanonicalTypeUnqualified() == Context.BoolTy) && \"Parser should have made sure that the expression is boolean\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaDeclCXX.cpp"
, 17251, __PRETTY_FUNCTION__))
;
17252 if (IsTopLevel && DiagnoseUnexpandedParameterPack(NoexceptExpr)) {
17253 ESI.Type = EST_BasicNoexcept;
17254 return;
17255 }
17256
17257 ESI.NoexceptExpr = NoexceptExpr;
17258 return;
17259 }
17260}
17261
17262void Sema::actOnDelayedExceptionSpecification(Decl *MethodD,
17263 ExceptionSpecificationType EST,
17264 SourceRange SpecificationRange,
17265 ArrayRef<ParsedType> DynamicExceptions,
17266 ArrayRef<SourceRange> DynamicExceptionRanges,
17267 Expr *NoexceptExpr) {
17268 if (!MethodD)
17269 return;
17270
17271 // Dig out the method we're referring to.
17272 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(MethodD))
17273 MethodD = FunTmpl->getTemplatedDecl();
17274
17275 CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(MethodD);
17276 if (!Method)
17277 return;
17278
17279 // Check the exception specification.
17280 llvm::SmallVector<QualType, 4> Exceptions;
17281 FunctionProtoType::ExceptionSpecInfo ESI;
17282 checkExceptionSpecification(/*IsTopLevel*/true, EST, DynamicExceptions,
17283 DynamicExceptionRanges, NoexceptExpr, Exceptions,
17284 ESI);
17285
17286 // Update the exception specification on the function type.
17287 Context.adjustExceptionSpec(Method, ESI, /*AsWritten*/true);
17288
17289 if (Method->isStatic())
17290 checkThisInStaticMemberFunctionExceptionSpec(Method);
17291
17292 if (Method->isVirtual()) {
17293 // Check overrides, which we previously had to delay.
17294 for (const CXXMethodDecl *O : Method->overridden_methods())
17295 CheckOverridingFunctionExceptionSpec(Method, O);
17296 }
17297}
17298
17299/// HandleMSProperty - Analyze a __delcspec(property) field of a C++ class.
17300///
17301MSPropertyDecl *Sema::HandleMSProperty(Scope *S, RecordDecl *Record,
17302 SourceLocation DeclStart, Declarator &D,
17303 Expr *BitWidth,
17304 InClassInitStyle InitStyle,
17305 AccessSpecifier AS,
17306 const ParsedAttr &MSPropertyAttr) {
17307 IdentifierInfo *II = D.getIdentifier();
17308 if (!II) {
17309 Diag(DeclStart, diag::err_anonymous_property);
17310 return nullptr;
17311 }
17312 SourceLocation Loc = D.getIdentifierLoc();
17313
17314 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
17315 QualType T = TInfo->getType();
17316 if (getLangOpts().CPlusPlus) {
17317 CheckExtraCXXDefaultArguments(D);
17318
17319 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
17320 UPPC_DataMemberType)) {
17321 D.setInvalidType();
17322 T = Context.IntTy;
17323 TInfo = Context.getTrivialTypeSourceInfo(T, Loc);
17324 }
17325 }
17326
17327 DiagnoseFunctionSpecifiers(D.getDeclSpec());
17328
17329 if (D.getDeclSpec().isInlineSpecified())
17330 Diag(D.getDeclSpec().getInlineSpecLoc(), diag::err_inline_non_function)
17331 << getLangOpts().CPlusPlus17;
17332 if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec())
17333 Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(),
17334 diag::err_invalid_thread)
17335 << DeclSpec::getSpecifierName(TSCS);
17336
17337 // Check to see if this name was declared as a member previously
17338 NamedDecl *PrevDecl = nullptr;
17339 LookupResult Previous(*this, II, Loc, LookupMemberName,
17340 ForVisibleRedeclaration);
17341 LookupName(Previous, S);
17342 switch (Previous.getResultKind()) {
17343 case LookupResult::Found:
17344 case LookupResult::FoundUnresolvedValue:
17345 PrevDecl = Previous.getAsSingle<NamedDecl>();
17346 break;
17347
17348 case LookupResult::FoundOverloaded:
17349 PrevDecl = Previous.getRepresentativeDecl();
17350 break;
17351
17352 case LookupResult::NotFound:
17353 case LookupResult::NotFoundInCurrentInstantiation:
17354 case LookupResult::Ambiguous:
17355 break;
17356 }
17357
17358 if (PrevDecl && PrevDecl->isTemplateParameter()) {
17359 // Maybe we will complain about the shadowed template parameter.
17360 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
17361 // Just pretend that we didn't see the previous declaration.
17362 PrevDecl = nullptr;
17363 }
17364
17365 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S))
17366 PrevDecl = nullptr;
17367
17368 SourceLocation TSSL = D.getBeginLoc();
17369 MSPropertyDecl *NewPD =
17370 MSPropertyDecl::Create(Context, Record, Loc, II, T, TInfo, TSSL,
17371 MSPropertyAttr.getPropertyDataGetter(),
17372 MSPropertyAttr.getPropertyDataSetter());
17373 ProcessDeclAttributes(TUScope, NewPD, D);
17374 NewPD->setAccess(AS);
17375
17376 if (NewPD->isInvalidDecl())
17377 Record->setInvalidDecl();
17378
17379 if (D.getDeclSpec().isModulePrivateSpecified())
17380 NewPD->setModulePrivate();
17381
17382 if (NewPD->isInvalidDecl() && PrevDecl) {
17383 // Don't introduce NewFD into scope; there's already something
17384 // with the same name in the same scope.
17385 } else if (II) {
17386 PushOnScopeChains(NewPD, S);
17387 } else
17388 Record->addDecl(NewPD);
17389
17390 return NewPD;
17391}