Bug Summary

File:clang/lib/Sema/SemaExprCXX.cpp
Warning:line 520, column 7
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 SemaExprCXX.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/SemaExprCXX.cpp
1//===--- SemaExprCXX.cpp - Semantic Analysis for Expressions --------------===//
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/// \file
10/// Implements semantic analysis for C++ expressions.
11///
12//===----------------------------------------------------------------------===//
13
14#include "clang/Sema/SemaInternal.h"
15#include "TreeTransform.h"
16#include "TypeLocBuilder.h"
17#include "clang/AST/ASTContext.h"
18#include "clang/AST/ASTLambda.h"
19#include "clang/AST/CXXInheritance.h"
20#include "clang/AST/CharUnits.h"
21#include "clang/AST/DeclObjC.h"
22#include "clang/AST/ExprCXX.h"
23#include "clang/AST/ExprObjC.h"
24#include "clang/AST/RecursiveASTVisitor.h"
25#include "clang/AST/TypeLoc.h"
26#include "clang/Basic/AlignedAllocation.h"
27#include "clang/Basic/PartialDiagnostic.h"
28#include "clang/Basic/TargetInfo.h"
29#include "clang/Lex/Preprocessor.h"
30#include "clang/Sema/DeclSpec.h"
31#include "clang/Sema/Initialization.h"
32#include "clang/Sema/Lookup.h"
33#include "clang/Sema/ParsedTemplate.h"
34#include "clang/Sema/Scope.h"
35#include "clang/Sema/ScopeInfo.h"
36#include "clang/Sema/SemaLambda.h"
37#include "clang/Sema/TemplateDeduction.h"
38#include "llvm/ADT/APInt.h"
39#include "llvm/ADT/STLExtras.h"
40#include "llvm/Support/ErrorHandling.h"
41using namespace clang;
42using namespace sema;
43
44/// Handle the result of the special case name lookup for inheriting
45/// constructor declarations. 'NS::X::X' and 'NS::X<...>::X' are treated as
46/// constructor names in member using declarations, even if 'X' is not the
47/// name of the corresponding type.
48ParsedType Sema::getInheritingConstructorName(CXXScopeSpec &SS,
49 SourceLocation NameLoc,
50 IdentifierInfo &Name) {
51 NestedNameSpecifier *NNS = SS.getScopeRep();
52
53 // Convert the nested-name-specifier into a type.
54 QualType Type;
55 switch (NNS->getKind()) {
56 case NestedNameSpecifier::TypeSpec:
57 case NestedNameSpecifier::TypeSpecWithTemplate:
58 Type = QualType(NNS->getAsType(), 0);
59 break;
60
61 case NestedNameSpecifier::Identifier:
62 // Strip off the last layer of the nested-name-specifier and build a
63 // typename type for it.
64 assert(NNS->getAsIdentifier() == &Name && "not a constructor name")((NNS->getAsIdentifier() == &Name && "not a constructor name"
) ? static_cast<void> (0) : __assert_fail ("NNS->getAsIdentifier() == &Name && \"not a constructor name\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 64, __PRETTY_FUNCTION__))
;
65 Type = Context.getDependentNameType(ETK_None, NNS->getPrefix(),
66 NNS->getAsIdentifier());
67 break;
68
69 case NestedNameSpecifier::Global:
70 case NestedNameSpecifier::Super:
71 case NestedNameSpecifier::Namespace:
72 case NestedNameSpecifier::NamespaceAlias:
73 llvm_unreachable("Nested name specifier is not a type for inheriting ctor")::llvm::llvm_unreachable_internal("Nested name specifier is not a type for inheriting ctor"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 73)
;
74 }
75
76 // This reference to the type is located entirely at the location of the
77 // final identifier in the qualified-id.
78 return CreateParsedType(Type,
79 Context.getTrivialTypeSourceInfo(Type, NameLoc));
80}
81
82ParsedType Sema::getConstructorName(IdentifierInfo &II,
83 SourceLocation NameLoc,
84 Scope *S, CXXScopeSpec &SS,
85 bool EnteringContext) {
86 CXXRecordDecl *CurClass = getCurrentClass(S, &SS);
87 assert(CurClass && &II == CurClass->getIdentifier() &&((CurClass && &II == CurClass->getIdentifier()
&& "not a constructor name") ? static_cast<void>
(0) : __assert_fail ("CurClass && &II == CurClass->getIdentifier() && \"not a constructor name\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 88, __PRETTY_FUNCTION__))
88 "not a constructor name")((CurClass && &II == CurClass->getIdentifier()
&& "not a constructor name") ? static_cast<void>
(0) : __assert_fail ("CurClass && &II == CurClass->getIdentifier() && \"not a constructor name\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 88, __PRETTY_FUNCTION__))
;
89
90 // When naming a constructor as a member of a dependent context (eg, in a
91 // friend declaration or an inherited constructor declaration), form an
92 // unresolved "typename" type.
93 if (CurClass->isDependentContext() && !EnteringContext && SS.getScopeRep()) {
94 QualType T = Context.getDependentNameType(ETK_None, SS.getScopeRep(), &II);
95 return ParsedType::make(T);
96 }
97
98 if (SS.isNotEmpty() && RequireCompleteDeclContext(SS, CurClass))
99 return ParsedType();
100
101 // Find the injected-class-name declaration. Note that we make no attempt to
102 // diagnose cases where the injected-class-name is shadowed: the only
103 // declaration that can validly shadow the injected-class-name is a
104 // non-static data member, and if the class contains both a non-static data
105 // member and a constructor then it is ill-formed (we check that in
106 // CheckCompletedCXXClass).
107 CXXRecordDecl *InjectedClassName = nullptr;
108 for (NamedDecl *ND : CurClass->lookup(&II)) {
109 auto *RD = dyn_cast<CXXRecordDecl>(ND);
110 if (RD && RD->isInjectedClassName()) {
111 InjectedClassName = RD;
112 break;
113 }
114 }
115 if (!InjectedClassName) {
116 if (!CurClass->isInvalidDecl()) {
117 // FIXME: RequireCompleteDeclContext doesn't check dependent contexts
118 // properly. Work around it here for now.
119 Diag(SS.getLastQualifierNameLoc(),
120 diag::err_incomplete_nested_name_spec) << CurClass << SS.getRange();
121 }
122 return ParsedType();
123 }
124
125 QualType T = Context.getTypeDeclType(InjectedClassName);
126 DiagnoseUseOfDecl(InjectedClassName, NameLoc);
127 MarkAnyDeclReferenced(NameLoc, InjectedClassName, /*OdrUse=*/false);
128
129 return ParsedType::make(T);
130}
131
132ParsedType Sema::getDestructorName(SourceLocation TildeLoc,
133 IdentifierInfo &II,
134 SourceLocation NameLoc,
135 Scope *S, CXXScopeSpec &SS,
136 ParsedType ObjectTypePtr,
137 bool EnteringContext) {
138 // Determine where to perform name lookup.
139
140 // FIXME: This area of the standard is very messy, and the current
141 // wording is rather unclear about which scopes we search for the
142 // destructor name; see core issues 399 and 555. Issue 399 in
143 // particular shows where the current description of destructor name
144 // lookup is completely out of line with existing practice, e.g.,
145 // this appears to be ill-formed:
146 //
147 // namespace N {
148 // template <typename T> struct S {
149 // ~S();
150 // };
151 // }
152 //
153 // void f(N::S<int>* s) {
154 // s->N::S<int>::~S();
155 // }
156 //
157 // See also PR6358 and PR6359.
158 // For this reason, we're currently only doing the C++03 version of this
159 // code; the C++0x version has to wait until we get a proper spec.
160 QualType SearchType;
161 DeclContext *LookupCtx = nullptr;
162 bool isDependent = false;
163 bool LookInScope = false;
164
165 if (SS.isInvalid())
166 return nullptr;
167
168 // If we have an object type, it's because we are in a
169 // pseudo-destructor-expression or a member access expression, and
170 // we know what type we're looking for.
171 if (ObjectTypePtr)
172 SearchType = GetTypeFromParser(ObjectTypePtr);
173
174 if (SS.isSet()) {
175 NestedNameSpecifier *NNS = SS.getScopeRep();
176
177 bool AlreadySearched = false;
178 bool LookAtPrefix = true;
179 // C++11 [basic.lookup.qual]p6:
180 // If a pseudo-destructor-name (5.2.4) contains a nested-name-specifier,
181 // the type-names are looked up as types in the scope designated by the
182 // nested-name-specifier. Similarly, in a qualified-id of the form:
183 //
184 // nested-name-specifier[opt] class-name :: ~ class-name
185 //
186 // the second class-name is looked up in the same scope as the first.
187 //
188 // Here, we determine whether the code below is permitted to look at the
189 // prefix of the nested-name-specifier.
190 DeclContext *DC = computeDeclContext(SS, EnteringContext);
191 if (DC && DC->isFileContext()) {
192 AlreadySearched = true;
193 LookupCtx = DC;
194 isDependent = false;
195 } else if (DC && isa<CXXRecordDecl>(DC)) {
196 LookAtPrefix = false;
197 LookInScope = true;
198 }
199
200 // The second case from the C++03 rules quoted further above.
201 NestedNameSpecifier *Prefix = nullptr;
202 if (AlreadySearched) {
203 // Nothing left to do.
204 } else if (LookAtPrefix && (Prefix = NNS->getPrefix())) {
205 CXXScopeSpec PrefixSS;
206 PrefixSS.Adopt(NestedNameSpecifierLoc(Prefix, SS.location_data()));
207 LookupCtx = computeDeclContext(PrefixSS, EnteringContext);
208 isDependent = isDependentScopeSpecifier(PrefixSS);
209 } else if (ObjectTypePtr) {
210 LookupCtx = computeDeclContext(SearchType);
211 isDependent = SearchType->isDependentType();
212 } else {
213 LookupCtx = computeDeclContext(SS, EnteringContext);
214 isDependent = LookupCtx && LookupCtx->isDependentContext();
215 }
216 } else if (ObjectTypePtr) {
217 // C++ [basic.lookup.classref]p3:
218 // If the unqualified-id is ~type-name, the type-name is looked up
219 // in the context of the entire postfix-expression. If the type T
220 // of the object expression is of a class type C, the type-name is
221 // also looked up in the scope of class C. At least one of the
222 // lookups shall find a name that refers to (possibly
223 // cv-qualified) T.
224 LookupCtx = computeDeclContext(SearchType);
225 isDependent = SearchType->isDependentType();
226 assert((isDependent || !SearchType->isIncompleteType()) &&(((isDependent || !SearchType->isIncompleteType()) &&
"Caller should have completed object type") ? static_cast<
void> (0) : __assert_fail ("(isDependent || !SearchType->isIncompleteType()) && \"Caller should have completed object type\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 227, __PRETTY_FUNCTION__))
227 "Caller should have completed object type")(((isDependent || !SearchType->isIncompleteType()) &&
"Caller should have completed object type") ? static_cast<
void> (0) : __assert_fail ("(isDependent || !SearchType->isIncompleteType()) && \"Caller should have completed object type\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 227, __PRETTY_FUNCTION__))
;
228
229 LookInScope = true;
230 } else {
231 // Perform lookup into the current scope (only).
232 LookInScope = true;
233 }
234
235 TypeDecl *NonMatchingTypeDecl = nullptr;
236 LookupResult Found(*this, &II, NameLoc, LookupOrdinaryName);
237 for (unsigned Step = 0; Step != 2; ++Step) {
238 // Look for the name first in the computed lookup context (if we
239 // have one) and, if that fails to find a match, in the scope (if
240 // we're allowed to look there).
241 Found.clear();
242 if (Step == 0 && LookupCtx) {
243 if (RequireCompleteDeclContext(SS, LookupCtx))
244 return nullptr;
245 LookupQualifiedName(Found, LookupCtx);
246 } else if (Step == 1 && LookInScope && S) {
247 LookupName(Found, S);
248 } else {
249 continue;
250 }
251
252 // FIXME: Should we be suppressing ambiguities here?
253 if (Found.isAmbiguous())
254 return nullptr;
255
256 if (TypeDecl *Type = Found.getAsSingle<TypeDecl>()) {
257 QualType T = Context.getTypeDeclType(Type);
258 MarkAnyDeclReferenced(Type->getLocation(), Type, /*OdrUse=*/false);
259
260 if (SearchType.isNull() || SearchType->isDependentType() ||
261 Context.hasSameUnqualifiedType(T, SearchType)) {
262 // We found our type!
263
264 return CreateParsedType(T,
265 Context.getTrivialTypeSourceInfo(T, NameLoc));
266 }
267
268 if (!SearchType.isNull())
269 NonMatchingTypeDecl = Type;
270 }
271
272 // If the name that we found is a class template name, and it is
273 // the same name as the template name in the last part of the
274 // nested-name-specifier (if present) or the object type, then
275 // this is the destructor for that class.
276 // FIXME: This is a workaround until we get real drafting for core
277 // issue 399, for which there isn't even an obvious direction.
278 if (ClassTemplateDecl *Template = Found.getAsSingle<ClassTemplateDecl>()) {
279 QualType MemberOfType;
280 if (SS.isSet()) {
281 if (DeclContext *Ctx = computeDeclContext(SS, EnteringContext)) {
282 // Figure out the type of the context, if it has one.
283 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Ctx))
284 MemberOfType = Context.getTypeDeclType(Record);
285 }
286 }
287 if (MemberOfType.isNull())
288 MemberOfType = SearchType;
289
290 if (MemberOfType.isNull())
291 continue;
292
293 // We're referring into a class template specialization. If the
294 // class template we found is the same as the template being
295 // specialized, we found what we are looking for.
296 if (const RecordType *Record = MemberOfType->getAs<RecordType>()) {
297 if (ClassTemplateSpecializationDecl *Spec
298 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) {
299 if (Spec->getSpecializedTemplate()->getCanonicalDecl() ==
300 Template->getCanonicalDecl())
301 return CreateParsedType(
302 MemberOfType,
303 Context.getTrivialTypeSourceInfo(MemberOfType, NameLoc));
304 }
305
306 continue;
307 }
308
309 // We're referring to an unresolved class template
310 // specialization. Determine whether we class template we found
311 // is the same as the template being specialized or, if we don't
312 // know which template is being specialized, that it at least
313 // has the same name.
314 if (const TemplateSpecializationType *SpecType
315 = MemberOfType->getAs<TemplateSpecializationType>()) {
316 TemplateName SpecName = SpecType->getTemplateName();
317
318 // The class template we found is the same template being
319 // specialized.
320 if (TemplateDecl *SpecTemplate = SpecName.getAsTemplateDecl()) {
321 if (SpecTemplate->getCanonicalDecl() == Template->getCanonicalDecl())
322 return CreateParsedType(
323 MemberOfType,
324 Context.getTrivialTypeSourceInfo(MemberOfType, NameLoc));
325
326 continue;
327 }
328
329 // The class template we found has the same name as the
330 // (dependent) template name being specialized.
331 if (DependentTemplateName *DepTemplate
332 = SpecName.getAsDependentTemplateName()) {
333 if (DepTemplate->isIdentifier() &&
334 DepTemplate->getIdentifier() == Template->getIdentifier())
335 return CreateParsedType(
336 MemberOfType,
337 Context.getTrivialTypeSourceInfo(MemberOfType, NameLoc));
338
339 continue;
340 }
341 }
342 }
343 }
344
345 if (isDependent) {
346 // We didn't find our type, but that's okay: it's dependent
347 // anyway.
348
349 // FIXME: What if we have no nested-name-specifier?
350 QualType T = CheckTypenameType(ETK_None, SourceLocation(),
351 SS.getWithLocInContext(Context),
352 II, NameLoc);
353 return ParsedType::make(T);
354 }
355
356 if (NonMatchingTypeDecl) {
357 QualType T = Context.getTypeDeclType(NonMatchingTypeDecl);
358 Diag(NameLoc, diag::err_destructor_expr_type_mismatch)
359 << T << SearchType;
360 Diag(NonMatchingTypeDecl->getLocation(), diag::note_destructor_type_here)
361 << T;
362 } else if (ObjectTypePtr)
363 Diag(NameLoc, diag::err_ident_in_dtor_not_a_type)
364 << &II;
365 else {
366 SemaDiagnosticBuilder DtorDiag = Diag(NameLoc,
367 diag::err_destructor_class_name);
368 if (S) {
369 const DeclContext *Ctx = S->getEntity();
370 if (const CXXRecordDecl *Class = dyn_cast_or_null<CXXRecordDecl>(Ctx))
371 DtorDiag << FixItHint::CreateReplacement(SourceRange(NameLoc),
372 Class->getNameAsString());
373 }
374 }
375
376 return nullptr;
377}
378
379ParsedType Sema::getDestructorTypeForDecltype(const DeclSpec &DS,
380 ParsedType ObjectType) {
381 if (DS.getTypeSpecType() == DeclSpec::TST_error)
382 return nullptr;
383
384 if (DS.getTypeSpecType() == DeclSpec::TST_decltype_auto) {
385 Diag(DS.getTypeSpecTypeLoc(), diag::err_decltype_auto_invalid);
386 return nullptr;
387 }
388
389 assert(DS.getTypeSpecType() == DeclSpec::TST_decltype &&((DS.getTypeSpecType() == DeclSpec::TST_decltype && "unexpected type in getDestructorType"
) ? static_cast<void> (0) : __assert_fail ("DS.getTypeSpecType() == DeclSpec::TST_decltype && \"unexpected type in getDestructorType\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 390, __PRETTY_FUNCTION__))
390 "unexpected type in getDestructorType")((DS.getTypeSpecType() == DeclSpec::TST_decltype && "unexpected type in getDestructorType"
) ? static_cast<void> (0) : __assert_fail ("DS.getTypeSpecType() == DeclSpec::TST_decltype && \"unexpected type in getDestructorType\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 390, __PRETTY_FUNCTION__))
;
391 QualType T = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc());
392
393 // If we know the type of the object, check that the correct destructor
394 // type was named now; we can give better diagnostics this way.
395 QualType SearchType = GetTypeFromParser(ObjectType);
396 if (!SearchType.isNull() && !SearchType->isDependentType() &&
397 !Context.hasSameUnqualifiedType(T, SearchType)) {
398 Diag(DS.getTypeSpecTypeLoc(), diag::err_destructor_expr_type_mismatch)
399 << T << SearchType;
400 return nullptr;
401 }
402
403 return ParsedType::make(T);
404}
405
406bool Sema::checkLiteralOperatorId(const CXXScopeSpec &SS,
407 const UnqualifiedId &Name) {
408 assert(Name.getKind() == UnqualifiedIdKind::IK_LiteralOperatorId)((Name.getKind() == UnqualifiedIdKind::IK_LiteralOperatorId) ?
static_cast<void> (0) : __assert_fail ("Name.getKind() == UnqualifiedIdKind::IK_LiteralOperatorId"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 408, __PRETTY_FUNCTION__))
;
409
410 if (!SS.isValid())
411 return false;
412
413 switch (SS.getScopeRep()->getKind()) {
414 case NestedNameSpecifier::Identifier:
415 case NestedNameSpecifier::TypeSpec:
416 case NestedNameSpecifier::TypeSpecWithTemplate:
417 // Per C++11 [over.literal]p2, literal operators can only be declared at
418 // namespace scope. Therefore, this unqualified-id cannot name anything.
419 // Reject it early, because we have no AST representation for this in the
420 // case where the scope is dependent.
421 Diag(Name.getBeginLoc(), diag::err_literal_operator_id_outside_namespace)
422 << SS.getScopeRep();
423 return true;
424
425 case NestedNameSpecifier::Global:
426 case NestedNameSpecifier::Super:
427 case NestedNameSpecifier::Namespace:
428 case NestedNameSpecifier::NamespaceAlias:
429 return false;
430 }
431
432 llvm_unreachable("unknown nested name specifier kind")::llvm::llvm_unreachable_internal("unknown nested name specifier kind"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 432)
;
433}
434
435/// Build a C++ typeid expression with a type operand.
436ExprResult Sema::BuildCXXTypeId(QualType TypeInfoType,
437 SourceLocation TypeidLoc,
438 TypeSourceInfo *Operand,
439 SourceLocation RParenLoc) {
440 // C++ [expr.typeid]p4:
441 // The top-level cv-qualifiers of the lvalue expression or the type-id
442 // that is the operand of typeid are always ignored.
443 // If the type of the type-id is a class type or a reference to a class
444 // type, the class shall be completely-defined.
445 Qualifiers Quals;
446 QualType T
447 = Context.getUnqualifiedArrayType(Operand->getType().getNonReferenceType(),
448 Quals);
449 if (T->getAs<RecordType>() &&
450 RequireCompleteType(TypeidLoc, T, diag::err_incomplete_typeid))
451 return ExprError();
452
453 if (T->isVariablyModifiedType())
454 return ExprError(Diag(TypeidLoc, diag::err_variably_modified_typeid) << T);
455
456 if (CheckQualifiedFunctionForTypeId(T, TypeidLoc))
457 return ExprError();
458
459 return new (Context) CXXTypeidExpr(TypeInfoType.withConst(), Operand,
460 SourceRange(TypeidLoc, RParenLoc));
461}
462
463/// Build a C++ typeid expression with an expression operand.
464ExprResult Sema::BuildCXXTypeId(QualType TypeInfoType,
465 SourceLocation TypeidLoc,
466 Expr *E,
467 SourceLocation RParenLoc) {
468 bool WasEvaluated = false;
469 if (E && !E->isTypeDependent()) {
13
Assuming 'E' is null
470 if (E->getType()->isPlaceholderType()) {
471 ExprResult result = CheckPlaceholderExpr(E);
472 if (result.isInvalid()) return ExprError();
473 E = result.get();
474 }
475
476 QualType T = E->getType();
477 if (const RecordType *RecordT = T->getAs<RecordType>()) {
478 CXXRecordDecl *RecordD = cast<CXXRecordDecl>(RecordT->getDecl());
479 // C++ [expr.typeid]p3:
480 // [...] If the type of the expression is a class type, the class
481 // shall be completely-defined.
482 if (RequireCompleteType(TypeidLoc, T, diag::err_incomplete_typeid))
483 return ExprError();
484
485 // C++ [expr.typeid]p3:
486 // When typeid is applied to an expression other than an glvalue of a
487 // polymorphic class type [...] [the] expression is an unevaluated
488 // operand. [...]
489 if (RecordD->isPolymorphic() && E->isGLValue()) {
490 // The subexpression is potentially evaluated; switch the context
491 // and recheck the subexpression.
492 ExprResult Result = TransformToPotentiallyEvaluated(E);
493 if (Result.isInvalid()) return ExprError();
494 E = Result.get();
495
496 // We require a vtable to query the type at run time.
497 MarkVTableUsed(TypeidLoc, RecordD);
498 WasEvaluated = true;
499 }
500 }
501
502 ExprResult Result = CheckUnevaluatedOperand(E);
503 if (Result.isInvalid())
504 return ExprError();
505 E = Result.get();
506
507 // C++ [expr.typeid]p4:
508 // [...] If the type of the type-id is a reference to a possibly
509 // cv-qualified type, the result of the typeid expression refers to a
510 // std::type_info object representing the cv-unqualified referenced
511 // type.
512 Qualifiers Quals;
513 QualType UnqualT = Context.getUnqualifiedArrayType(T, Quals);
514 if (!Context.hasSameType(T, UnqualT)) {
515 T = UnqualT;
516 E = ImpCastExprToType(E, UnqualT, CK_NoOp, E->getValueKind()).get();
517 }
518 }
519
520 if (E->getType()->isVariablyModifiedType())
14
Called C++ object pointer is null
521 return ExprError(Diag(TypeidLoc, diag::err_variably_modified_typeid)
522 << E->getType());
523 else if (!inTemplateInstantiation() &&
524 E->HasSideEffects(Context, WasEvaluated)) {
525 // The expression operand for typeid is in an unevaluated expression
526 // context, so side effects could result in unintended consequences.
527 Diag(E->getExprLoc(), WasEvaluated
528 ? diag::warn_side_effects_typeid
529 : diag::warn_side_effects_unevaluated_context);
530 }
531
532 return new (Context) CXXTypeidExpr(TypeInfoType.withConst(), E,
533 SourceRange(TypeidLoc, RParenLoc));
534}
535
536/// ActOnCXXTypeidOfType - Parse typeid( type-id ) or typeid (expression);
537ExprResult
538Sema::ActOnCXXTypeid(SourceLocation OpLoc, SourceLocation LParenLoc,
539 bool isType, void *TyOrExpr, SourceLocation RParenLoc) {
540 // typeid is not supported in OpenCL.
541 if (getLangOpts().OpenCLCPlusPlus) {
1
Assuming field 'OpenCLCPlusPlus' is 0
2
Taking false branch
542 return ExprError(Diag(OpLoc, diag::err_openclcxx_not_supported)
543 << "typeid");
544 }
545
546 // Find the std::type_info type.
547 if (!getStdNamespace())
3
Assuming the condition is false
4
Taking false branch
548 return ExprError(Diag(OpLoc, diag::err_need_header_before_typeid));
549
550 if (!CXXTypeInfoDecl) {
5
Assuming field 'CXXTypeInfoDecl' is non-null
6
Taking false branch
551 IdentifierInfo *TypeInfoII = &PP.getIdentifierTable().get("type_info");
552 LookupResult R(*this, TypeInfoII, SourceLocation(), LookupTagName);
553 LookupQualifiedName(R, getStdNamespace());
554 CXXTypeInfoDecl = R.getAsSingle<RecordDecl>();
555 // Microsoft's typeinfo doesn't have type_info in std but in the global
556 // namespace if _HAS_EXCEPTIONS is defined to 0. See PR13153.
557 if (!CXXTypeInfoDecl && LangOpts.MSVCCompat) {
558 LookupQualifiedName(R, Context.getTranslationUnitDecl());
559 CXXTypeInfoDecl = R.getAsSingle<RecordDecl>();
560 }
561 if (!CXXTypeInfoDecl)
562 return ExprError(Diag(OpLoc, diag::err_need_header_before_typeid));
563 }
564
565 if (!getLangOpts().RTTI) {
7
Assuming field 'RTTI' is not equal to 0
8
Taking false branch
566 return ExprError(Diag(OpLoc, diag::err_no_typeid_with_fno_rtti));
567 }
568
569 QualType TypeInfoType = Context.getTypeDeclType(CXXTypeInfoDecl);
570
571 if (isType) {
9
Assuming 'isType' is false
10
Taking false branch
572 // The operand is a type; handle it as such.
573 TypeSourceInfo *TInfo = nullptr;
574 QualType T = GetTypeFromParser(ParsedType::getFromOpaquePtr(TyOrExpr),
575 &TInfo);
576 if (T.isNull())
577 return ExprError();
578
579 if (!TInfo)
580 TInfo = Context.getTrivialTypeSourceInfo(T, OpLoc);
581
582 return BuildCXXTypeId(TypeInfoType, OpLoc, TInfo, RParenLoc);
583 }
584
585 // The operand is an expression.
586 return BuildCXXTypeId(TypeInfoType, OpLoc, (Expr*)TyOrExpr, RParenLoc);
11
Passing value via 3rd parameter 'E'
12
Calling 'Sema::BuildCXXTypeId'
587}
588
589/// Grabs __declspec(uuid()) off a type, or returns 0 if we cannot resolve to
590/// a single GUID.
591static void
592getUuidAttrOfType(Sema &SemaRef, QualType QT,
593 llvm::SmallSetVector<const UuidAttr *, 1> &UuidAttrs) {
594 // Optionally remove one level of pointer, reference or array indirection.
595 const Type *Ty = QT.getTypePtr();
596 if (QT->isPointerType() || QT->isReferenceType())
597 Ty = QT->getPointeeType().getTypePtr();
598 else if (QT->isArrayType())
599 Ty = Ty->getBaseElementTypeUnsafe();
600
601 const auto *TD = Ty->getAsTagDecl();
602 if (!TD)
603 return;
604
605 if (const auto *Uuid = TD->getMostRecentDecl()->getAttr<UuidAttr>()) {
606 UuidAttrs.insert(Uuid);
607 return;
608 }
609
610 // __uuidof can grab UUIDs from template arguments.
611 if (const auto *CTSD = dyn_cast<ClassTemplateSpecializationDecl>(TD)) {
612 const TemplateArgumentList &TAL = CTSD->getTemplateArgs();
613 for (const TemplateArgument &TA : TAL.asArray()) {
614 const UuidAttr *UuidForTA = nullptr;
615 if (TA.getKind() == TemplateArgument::Type)
616 getUuidAttrOfType(SemaRef, TA.getAsType(), UuidAttrs);
617 else if (TA.getKind() == TemplateArgument::Declaration)
618 getUuidAttrOfType(SemaRef, TA.getAsDecl()->getType(), UuidAttrs);
619
620 if (UuidForTA)
621 UuidAttrs.insert(UuidForTA);
622 }
623 }
624}
625
626/// Build a Microsoft __uuidof expression with a type operand.
627ExprResult Sema::BuildCXXUuidof(QualType TypeInfoType,
628 SourceLocation TypeidLoc,
629 TypeSourceInfo *Operand,
630 SourceLocation RParenLoc) {
631 StringRef UuidStr;
632 if (!Operand->getType()->isDependentType()) {
633 llvm::SmallSetVector<const UuidAttr *, 1> UuidAttrs;
634 getUuidAttrOfType(*this, Operand->getType(), UuidAttrs);
635 if (UuidAttrs.empty())
636 return ExprError(Diag(TypeidLoc, diag::err_uuidof_without_guid));
637 if (UuidAttrs.size() > 1)
638 return ExprError(Diag(TypeidLoc, diag::err_uuidof_with_multiple_guids));
639 UuidStr = UuidAttrs.back()->getGuid();
640 }
641
642 return new (Context) CXXUuidofExpr(TypeInfoType.withConst(), Operand, UuidStr,
643 SourceRange(TypeidLoc, RParenLoc));
644}
645
646/// Build a Microsoft __uuidof expression with an expression operand.
647ExprResult Sema::BuildCXXUuidof(QualType TypeInfoType,
648 SourceLocation TypeidLoc,
649 Expr *E,
650 SourceLocation RParenLoc) {
651 StringRef UuidStr;
652 if (!E->getType()->isDependentType()) {
653 if (E->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
654 UuidStr = "00000000-0000-0000-0000-000000000000";
655 } else {
656 llvm::SmallSetVector<const UuidAttr *, 1> UuidAttrs;
657 getUuidAttrOfType(*this, E->getType(), UuidAttrs);
658 if (UuidAttrs.empty())
659 return ExprError(Diag(TypeidLoc, diag::err_uuidof_without_guid));
660 if (UuidAttrs.size() > 1)
661 return ExprError(Diag(TypeidLoc, diag::err_uuidof_with_multiple_guids));
662 UuidStr = UuidAttrs.back()->getGuid();
663 }
664 }
665
666 return new (Context) CXXUuidofExpr(TypeInfoType.withConst(), E, UuidStr,
667 SourceRange(TypeidLoc, RParenLoc));
668}
669
670/// ActOnCXXUuidof - Parse __uuidof( type-id ) or __uuidof (expression);
671ExprResult
672Sema::ActOnCXXUuidof(SourceLocation OpLoc, SourceLocation LParenLoc,
673 bool isType, void *TyOrExpr, SourceLocation RParenLoc) {
674 // If MSVCGuidDecl has not been cached, do the lookup.
675 if (!MSVCGuidDecl) {
676 IdentifierInfo *GuidII = &PP.getIdentifierTable().get("_GUID");
677 LookupResult R(*this, GuidII, SourceLocation(), LookupTagName);
678 LookupQualifiedName(R, Context.getTranslationUnitDecl());
679 MSVCGuidDecl = R.getAsSingle<RecordDecl>();
680 if (!MSVCGuidDecl)
681 return ExprError(Diag(OpLoc, diag::err_need_header_before_ms_uuidof));
682 }
683
684 QualType GuidType = Context.getTypeDeclType(MSVCGuidDecl);
685
686 if (isType) {
687 // The operand is a type; handle it as such.
688 TypeSourceInfo *TInfo = nullptr;
689 QualType T = GetTypeFromParser(ParsedType::getFromOpaquePtr(TyOrExpr),
690 &TInfo);
691 if (T.isNull())
692 return ExprError();
693
694 if (!TInfo)
695 TInfo = Context.getTrivialTypeSourceInfo(T, OpLoc);
696
697 return BuildCXXUuidof(GuidType, OpLoc, TInfo, RParenLoc);
698 }
699
700 // The operand is an expression.
701 return BuildCXXUuidof(GuidType, OpLoc, (Expr*)TyOrExpr, RParenLoc);
702}
703
704/// ActOnCXXBoolLiteral - Parse {true,false} literals.
705ExprResult
706Sema::ActOnCXXBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind) {
707 assert((Kind == tok::kw_true || Kind == tok::kw_false) &&(((Kind == tok::kw_true || Kind == tok::kw_false) && "Unknown C++ Boolean value!"
) ? static_cast<void> (0) : __assert_fail ("(Kind == tok::kw_true || Kind == tok::kw_false) && \"Unknown C++ Boolean value!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 708, __PRETTY_FUNCTION__))
708 "Unknown C++ Boolean value!")(((Kind == tok::kw_true || Kind == tok::kw_false) && "Unknown C++ Boolean value!"
) ? static_cast<void> (0) : __assert_fail ("(Kind == tok::kw_true || Kind == tok::kw_false) && \"Unknown C++ Boolean value!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 708, __PRETTY_FUNCTION__))
;
709 return new (Context)
710 CXXBoolLiteralExpr(Kind == tok::kw_true, Context.BoolTy, OpLoc);
711}
712
713/// ActOnCXXNullPtrLiteral - Parse 'nullptr'.
714ExprResult
715Sema::ActOnCXXNullPtrLiteral(SourceLocation Loc) {
716 return new (Context) CXXNullPtrLiteralExpr(Context.NullPtrTy, Loc);
717}
718
719/// ActOnCXXThrow - Parse throw expressions.
720ExprResult
721Sema::ActOnCXXThrow(Scope *S, SourceLocation OpLoc, Expr *Ex) {
722 bool IsThrownVarInScope = false;
723 if (Ex) {
724 // C++0x [class.copymove]p31:
725 // When certain criteria are met, an implementation is allowed to omit the
726 // copy/move construction of a class object [...]
727 //
728 // - in a throw-expression, when the operand is the name of a
729 // non-volatile automatic object (other than a function or catch-
730 // clause parameter) whose scope does not extend beyond the end of the
731 // innermost enclosing try-block (if there is one), the copy/move
732 // operation from the operand to the exception object (15.1) can be
733 // omitted by constructing the automatic object directly into the
734 // exception object
735 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Ex->IgnoreParens()))
736 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) {
737 if (Var->hasLocalStorage() && !Var->getType().isVolatileQualified()) {
738 for( ; S; S = S->getParent()) {
739 if (S->isDeclScope(Var)) {
740 IsThrownVarInScope = true;
741 break;
742 }
743
744 if (S->getFlags() &
745 (Scope::FnScope | Scope::ClassScope | Scope::BlockScope |
746 Scope::FunctionPrototypeScope | Scope::ObjCMethodScope |
747 Scope::TryScope))
748 break;
749 }
750 }
751 }
752 }
753
754 return BuildCXXThrow(OpLoc, Ex, IsThrownVarInScope);
755}
756
757ExprResult Sema::BuildCXXThrow(SourceLocation OpLoc, Expr *Ex,
758 bool IsThrownVarInScope) {
759 // Don't report an error if 'throw' is used in system headers.
760 if (!getLangOpts().CXXExceptions &&
761 !getSourceManager().isInSystemHeader(OpLoc) && !getLangOpts().CUDA) {
762 // Delay error emission for the OpenMP device code.
763 targetDiag(OpLoc, diag::err_exceptions_disabled) << "throw";
764 }
765
766 // Exceptions aren't allowed in CUDA device code.
767 if (getLangOpts().CUDA)
768 CUDADiagIfDeviceCode(OpLoc, diag::err_cuda_device_exceptions)
769 << "throw" << CurrentCUDATarget();
770
771 if (getCurScope() && getCurScope()->isOpenMPSimdDirectiveScope())
772 Diag(OpLoc, diag::err_omp_simd_region_cannot_use_stmt) << "throw";
773
774 if (Ex && !Ex->isTypeDependent()) {
775 QualType ExceptionObjectTy = Context.getExceptionObjectType(Ex->getType());
776 if (CheckCXXThrowOperand(OpLoc, ExceptionObjectTy, Ex))
777 return ExprError();
778
779 // Initialize the exception result. This implicitly weeds out
780 // abstract types or types with inaccessible copy constructors.
781
782 // C++0x [class.copymove]p31:
783 // When certain criteria are met, an implementation is allowed to omit the
784 // copy/move construction of a class object [...]
785 //
786 // - in a throw-expression, when the operand is the name of a
787 // non-volatile automatic object (other than a function or
788 // catch-clause
789 // parameter) whose scope does not extend beyond the end of the
790 // innermost enclosing try-block (if there is one), the copy/move
791 // operation from the operand to the exception object (15.1) can be
792 // omitted by constructing the automatic object directly into the
793 // exception object
794 const VarDecl *NRVOVariable = nullptr;
795 if (IsThrownVarInScope)
796 NRVOVariable = getCopyElisionCandidate(QualType(), Ex, CES_Strict);
797
798 InitializedEntity Entity = InitializedEntity::InitializeException(
799 OpLoc, ExceptionObjectTy,
800 /*NRVO=*/NRVOVariable != nullptr);
801 ExprResult Res = PerformMoveOrCopyInitialization(
802 Entity, NRVOVariable, QualType(), Ex, IsThrownVarInScope);
803 if (Res.isInvalid())
804 return ExprError();
805 Ex = Res.get();
806 }
807
808 return new (Context)
809 CXXThrowExpr(Ex, Context.VoidTy, OpLoc, IsThrownVarInScope);
810}
811
812static void
813collectPublicBases(CXXRecordDecl *RD,
814 llvm::DenseMap<CXXRecordDecl *, unsigned> &SubobjectsSeen,
815 llvm::SmallPtrSetImpl<CXXRecordDecl *> &VBases,
816 llvm::SetVector<CXXRecordDecl *> &PublicSubobjectsSeen,
817 bool ParentIsPublic) {
818 for (const CXXBaseSpecifier &BS : RD->bases()) {
819 CXXRecordDecl *BaseDecl = BS.getType()->getAsCXXRecordDecl();
820 bool NewSubobject;
821 // Virtual bases constitute the same subobject. Non-virtual bases are
822 // always distinct subobjects.
823 if (BS.isVirtual())
824 NewSubobject = VBases.insert(BaseDecl).second;
825 else
826 NewSubobject = true;
827
828 if (NewSubobject)
829 ++SubobjectsSeen[BaseDecl];
830
831 // Only add subobjects which have public access throughout the entire chain.
832 bool PublicPath = ParentIsPublic && BS.getAccessSpecifier() == AS_public;
833 if (PublicPath)
834 PublicSubobjectsSeen.insert(BaseDecl);
835
836 // Recurse on to each base subobject.
837 collectPublicBases(BaseDecl, SubobjectsSeen, VBases, PublicSubobjectsSeen,
838 PublicPath);
839 }
840}
841
842static void getUnambiguousPublicSubobjects(
843 CXXRecordDecl *RD, llvm::SmallVectorImpl<CXXRecordDecl *> &Objects) {
844 llvm::DenseMap<CXXRecordDecl *, unsigned> SubobjectsSeen;
845 llvm::SmallSet<CXXRecordDecl *, 2> VBases;
846 llvm::SetVector<CXXRecordDecl *> PublicSubobjectsSeen;
847 SubobjectsSeen[RD] = 1;
848 PublicSubobjectsSeen.insert(RD);
849 collectPublicBases(RD, SubobjectsSeen, VBases, PublicSubobjectsSeen,
850 /*ParentIsPublic=*/true);
851
852 for (CXXRecordDecl *PublicSubobject : PublicSubobjectsSeen) {
853 // Skip ambiguous objects.
854 if (SubobjectsSeen[PublicSubobject] > 1)
855 continue;
856
857 Objects.push_back(PublicSubobject);
858 }
859}
860
861/// CheckCXXThrowOperand - Validate the operand of a throw.
862bool Sema::CheckCXXThrowOperand(SourceLocation ThrowLoc,
863 QualType ExceptionObjectTy, Expr *E) {
864 // If the type of the exception would be an incomplete type or a pointer
865 // to an incomplete type other than (cv) void the program is ill-formed.
866 QualType Ty = ExceptionObjectTy;
867 bool isPointer = false;
868 if (const PointerType* Ptr = Ty->getAs<PointerType>()) {
869 Ty = Ptr->getPointeeType();
870 isPointer = true;
871 }
872 if (!isPointer || !Ty->isVoidType()) {
873 if (RequireCompleteType(ThrowLoc, Ty,
874 isPointer ? diag::err_throw_incomplete_ptr
875 : diag::err_throw_incomplete,
876 E->getSourceRange()))
877 return true;
878
879 if (RequireNonAbstractType(ThrowLoc, ExceptionObjectTy,
880 diag::err_throw_abstract_type, E))
881 return true;
882 }
883
884 // If the exception has class type, we need additional handling.
885 CXXRecordDecl *RD = Ty->getAsCXXRecordDecl();
886 if (!RD)
887 return false;
888
889 // If we are throwing a polymorphic class type or pointer thereof,
890 // exception handling will make use of the vtable.
891 MarkVTableUsed(ThrowLoc, RD);
892
893 // If a pointer is thrown, the referenced object will not be destroyed.
894 if (isPointer)
895 return false;
896
897 // If the class has a destructor, we must be able to call it.
898 if (!RD->hasIrrelevantDestructor()) {
899 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) {
900 MarkFunctionReferenced(E->getExprLoc(), Destructor);
901 CheckDestructorAccess(E->getExprLoc(), Destructor,
902 PDiag(diag::err_access_dtor_exception) << Ty);
903 if (DiagnoseUseOfDecl(Destructor, E->getExprLoc()))
904 return true;
905 }
906 }
907
908 // The MSVC ABI creates a list of all types which can catch the exception
909 // object. This list also references the appropriate copy constructor to call
910 // if the object is caught by value and has a non-trivial copy constructor.
911 if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
912 // We are only interested in the public, unambiguous bases contained within
913 // the exception object. Bases which are ambiguous or otherwise
914 // inaccessible are not catchable types.
915 llvm::SmallVector<CXXRecordDecl *, 2> UnambiguousPublicSubobjects;
916 getUnambiguousPublicSubobjects(RD, UnambiguousPublicSubobjects);
917
918 for (CXXRecordDecl *Subobject : UnambiguousPublicSubobjects) {
919 // Attempt to lookup the copy constructor. Various pieces of machinery
920 // will spring into action, like template instantiation, which means this
921 // cannot be a simple walk of the class's decls. Instead, we must perform
922 // lookup and overload resolution.
923 CXXConstructorDecl *CD = LookupCopyingConstructor(Subobject, 0);
924 if (!CD || CD->isDeleted())
925 continue;
926
927 // Mark the constructor referenced as it is used by this throw expression.
928 MarkFunctionReferenced(E->getExprLoc(), CD);
929
930 // Skip this copy constructor if it is trivial, we don't need to record it
931 // in the catchable type data.
932 if (CD->isTrivial())
933 continue;
934
935 // The copy constructor is non-trivial, create a mapping from this class
936 // type to this constructor.
937 // N.B. The selection of copy constructor is not sensitive to this
938 // particular throw-site. Lookup will be performed at the catch-site to
939 // ensure that the copy constructor is, in fact, accessible (via
940 // friendship or any other means).
941 Context.addCopyConstructorForExceptionObject(Subobject, CD);
942
943 // We don't keep the instantiated default argument expressions around so
944 // we must rebuild them here.
945 for (unsigned I = 1, E = CD->getNumParams(); I != E; ++I) {
946 if (CheckCXXDefaultArgExpr(ThrowLoc, CD, CD->getParamDecl(I)))
947 return true;
948 }
949 }
950 }
951
952 // Under the Itanium C++ ABI, memory for the exception object is allocated by
953 // the runtime with no ability for the compiler to request additional
954 // alignment. Warn if the exception type requires alignment beyond the minimum
955 // guaranteed by the target C++ runtime.
956 if (Context.getTargetInfo().getCXXABI().isItaniumFamily()) {
957 CharUnits TypeAlign = Context.getTypeAlignInChars(Ty);
958 CharUnits ExnObjAlign = Context.getExnObjectAlignment();
959 if (ExnObjAlign < TypeAlign) {
960 Diag(ThrowLoc, diag::warn_throw_underaligned_obj);
961 Diag(ThrowLoc, diag::note_throw_underaligned_obj)
962 << Ty << (unsigned)TypeAlign.getQuantity()
963 << (unsigned)ExnObjAlign.getQuantity();
964 }
965 }
966
967 return false;
968}
969
970static QualType adjustCVQualifiersForCXXThisWithinLambda(
971 ArrayRef<FunctionScopeInfo *> FunctionScopes, QualType ThisTy,
972 DeclContext *CurSemaContext, ASTContext &ASTCtx) {
973
974 QualType ClassType = ThisTy->getPointeeType();
975 LambdaScopeInfo *CurLSI = nullptr;
976 DeclContext *CurDC = CurSemaContext;
977
978 // Iterate through the stack of lambdas starting from the innermost lambda to
979 // the outermost lambda, checking if '*this' is ever captured by copy - since
980 // that could change the cv-qualifiers of the '*this' object.
981 // The object referred to by '*this' starts out with the cv-qualifiers of its
982 // member function. We then start with the innermost lambda and iterate
983 // outward checking to see if any lambda performs a by-copy capture of '*this'
984 // - and if so, any nested lambda must respect the 'constness' of that
985 // capturing lamdbda's call operator.
986 //
987
988 // Since the FunctionScopeInfo stack is representative of the lexical
989 // nesting of the lambda expressions during initial parsing (and is the best
990 // place for querying information about captures about lambdas that are
991 // partially processed) and perhaps during instantiation of function templates
992 // that contain lambda expressions that need to be transformed BUT not
993 // necessarily during instantiation of a nested generic lambda's function call
994 // operator (which might even be instantiated at the end of the TU) - at which
995 // time the DeclContext tree is mature enough to query capture information
996 // reliably - we use a two pronged approach to walk through all the lexically
997 // enclosing lambda expressions:
998 //
999 // 1) Climb down the FunctionScopeInfo stack as long as each item represents
1000 // a Lambda (i.e. LambdaScopeInfo) AND each LSI's 'closure-type' is lexically
1001 // enclosed by the call-operator of the LSI below it on the stack (while
1002 // tracking the enclosing DC for step 2 if needed). Note the topmost LSI on
1003 // the stack represents the innermost lambda.
1004 //
1005 // 2) If we run out of enclosing LSI's, check if the enclosing DeclContext
1006 // represents a lambda's call operator. If it does, we must be instantiating
1007 // a generic lambda's call operator (represented by the Current LSI, and
1008 // should be the only scenario where an inconsistency between the LSI and the
1009 // DeclContext should occur), so climb out the DeclContexts if they
1010 // represent lambdas, while querying the corresponding closure types
1011 // regarding capture information.
1012
1013 // 1) Climb down the function scope info stack.
1014 for (int I = FunctionScopes.size();
1015 I-- && isa<LambdaScopeInfo>(FunctionScopes[I]) &&
1016 (!CurLSI || !CurLSI->Lambda || CurLSI->Lambda->getDeclContext() ==
1017 cast<LambdaScopeInfo>(FunctionScopes[I])->CallOperator);
1018 CurDC = getLambdaAwareParentOfDeclContext(CurDC)) {
1019 CurLSI = cast<LambdaScopeInfo>(FunctionScopes[I]);
1020
1021 if (!CurLSI->isCXXThisCaptured())
1022 continue;
1023
1024 auto C = CurLSI->getCXXThisCapture();
1025
1026 if (C.isCopyCapture()) {
1027 ClassType.removeLocalCVRQualifiers(Qualifiers::CVRMask);
1028 if (CurLSI->CallOperator->isConst())
1029 ClassType.addConst();
1030 return ASTCtx.getPointerType(ClassType);
1031 }
1032 }
1033
1034 // 2) We've run out of ScopeInfos but check if CurDC is a lambda (which can
1035 // happen during instantiation of its nested generic lambda call operator)
1036 if (isLambdaCallOperator(CurDC)) {
1037 assert(CurLSI && "While computing 'this' capture-type for a generic "((CurLSI && "While computing 'this' capture-type for a generic "
"lambda, we must have a corresponding LambdaScopeInfo") ? static_cast
<void> (0) : __assert_fail ("CurLSI && \"While computing 'this' capture-type for a generic \" \"lambda, we must have a corresponding LambdaScopeInfo\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 1038, __PRETTY_FUNCTION__))
1038 "lambda, we must have a corresponding LambdaScopeInfo")((CurLSI && "While computing 'this' capture-type for a generic "
"lambda, we must have a corresponding LambdaScopeInfo") ? static_cast
<void> (0) : __assert_fail ("CurLSI && \"While computing 'this' capture-type for a generic \" \"lambda, we must have a corresponding LambdaScopeInfo\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 1038, __PRETTY_FUNCTION__))
;
1039 assert(isGenericLambdaCallOperatorSpecialization(CurLSI->CallOperator) &&((isGenericLambdaCallOperatorSpecialization(CurLSI->CallOperator
) && "While computing 'this' capture-type for a generic lambda, when we "
"run out of enclosing LSI's, yet the enclosing DC is a " "lambda-call-operator we must be (i.e. Current LSI) in a generic "
"lambda call oeprator") ? static_cast<void> (0) : __assert_fail
("isGenericLambdaCallOperatorSpecialization(CurLSI->CallOperator) && \"While computing 'this' capture-type for a generic lambda, when we \" \"run out of enclosing LSI's, yet the enclosing DC is a \" \"lambda-call-operator we must be (i.e. Current LSI) in a generic \" \"lambda call oeprator\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 1043, __PRETTY_FUNCTION__))
1040 "While computing 'this' capture-type for a generic lambda, when we "((isGenericLambdaCallOperatorSpecialization(CurLSI->CallOperator
) && "While computing 'this' capture-type for a generic lambda, when we "
"run out of enclosing LSI's, yet the enclosing DC is a " "lambda-call-operator we must be (i.e. Current LSI) in a generic "
"lambda call oeprator") ? static_cast<void> (0) : __assert_fail
("isGenericLambdaCallOperatorSpecialization(CurLSI->CallOperator) && \"While computing 'this' capture-type for a generic lambda, when we \" \"run out of enclosing LSI's, yet the enclosing DC is a \" \"lambda-call-operator we must be (i.e. Current LSI) in a generic \" \"lambda call oeprator\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 1043, __PRETTY_FUNCTION__))
1041 "run out of enclosing LSI's, yet the enclosing DC is a "((isGenericLambdaCallOperatorSpecialization(CurLSI->CallOperator
) && "While computing 'this' capture-type for a generic lambda, when we "
"run out of enclosing LSI's, yet the enclosing DC is a " "lambda-call-operator we must be (i.e. Current LSI) in a generic "
"lambda call oeprator") ? static_cast<void> (0) : __assert_fail
("isGenericLambdaCallOperatorSpecialization(CurLSI->CallOperator) && \"While computing 'this' capture-type for a generic lambda, when we \" \"run out of enclosing LSI's, yet the enclosing DC is a \" \"lambda-call-operator we must be (i.e. Current LSI) in a generic \" \"lambda call oeprator\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 1043, __PRETTY_FUNCTION__))
1042 "lambda-call-operator we must be (i.e. Current LSI) in a generic "((isGenericLambdaCallOperatorSpecialization(CurLSI->CallOperator
) && "While computing 'this' capture-type for a generic lambda, when we "
"run out of enclosing LSI's, yet the enclosing DC is a " "lambda-call-operator we must be (i.e. Current LSI) in a generic "
"lambda call oeprator") ? static_cast<void> (0) : __assert_fail
("isGenericLambdaCallOperatorSpecialization(CurLSI->CallOperator) && \"While computing 'this' capture-type for a generic lambda, when we \" \"run out of enclosing LSI's, yet the enclosing DC is a \" \"lambda-call-operator we must be (i.e. Current LSI) in a generic \" \"lambda call oeprator\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 1043, __PRETTY_FUNCTION__))
1043 "lambda call oeprator")((isGenericLambdaCallOperatorSpecialization(CurLSI->CallOperator
) && "While computing 'this' capture-type for a generic lambda, when we "
"run out of enclosing LSI's, yet the enclosing DC is a " "lambda-call-operator we must be (i.e. Current LSI) in a generic "
"lambda call oeprator") ? static_cast<void> (0) : __assert_fail
("isGenericLambdaCallOperatorSpecialization(CurLSI->CallOperator) && \"While computing 'this' capture-type for a generic lambda, when we \" \"run out of enclosing LSI's, yet the enclosing DC is a \" \"lambda-call-operator we must be (i.e. Current LSI) in a generic \" \"lambda call oeprator\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 1043, __PRETTY_FUNCTION__))
;
1044 assert(CurDC == getLambdaAwareParentOfDeclContext(CurLSI->CallOperator))((CurDC == getLambdaAwareParentOfDeclContext(CurLSI->CallOperator
)) ? static_cast<void> (0) : __assert_fail ("CurDC == getLambdaAwareParentOfDeclContext(CurLSI->CallOperator)"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 1044, __PRETTY_FUNCTION__))
;
1045
1046 auto IsThisCaptured =
1047 [](CXXRecordDecl *Closure, bool &IsByCopy, bool &IsConst) {
1048 IsConst = false;
1049 IsByCopy = false;
1050 for (auto &&C : Closure->captures()) {
1051 if (C.capturesThis()) {
1052 if (C.getCaptureKind() == LCK_StarThis)
1053 IsByCopy = true;
1054 if (Closure->getLambdaCallOperator()->isConst())
1055 IsConst = true;
1056 return true;
1057 }
1058 }
1059 return false;
1060 };
1061
1062 bool IsByCopyCapture = false;
1063 bool IsConstCapture = false;
1064 CXXRecordDecl *Closure = cast<CXXRecordDecl>(CurDC->getParent());
1065 while (Closure &&
1066 IsThisCaptured(Closure, IsByCopyCapture, IsConstCapture)) {
1067 if (IsByCopyCapture) {
1068 ClassType.removeLocalCVRQualifiers(Qualifiers::CVRMask);
1069 if (IsConstCapture)
1070 ClassType.addConst();
1071 return ASTCtx.getPointerType(ClassType);
1072 }
1073 Closure = isLambdaCallOperator(Closure->getParent())
1074 ? cast<CXXRecordDecl>(Closure->getParent()->getParent())
1075 : nullptr;
1076 }
1077 }
1078 return ASTCtx.getPointerType(ClassType);
1079}
1080
1081QualType Sema::getCurrentThisType() {
1082 DeclContext *DC = getFunctionLevelDeclContext();
1083 QualType ThisTy = CXXThisTypeOverride;
1084
1085 if (CXXMethodDecl *method = dyn_cast<CXXMethodDecl>(DC)) {
1086 if (method && method->isInstance())
1087 ThisTy = method->getThisType();
1088 }
1089
1090 if (ThisTy.isNull() && isLambdaCallOperator(CurContext) &&
1091 inTemplateInstantiation()) {
1092
1093 assert(isa<CXXRecordDecl>(DC) &&((isa<CXXRecordDecl>(DC) && "Trying to get 'this' type from static method?"
) ? static_cast<void> (0) : __assert_fail ("isa<CXXRecordDecl>(DC) && \"Trying to get 'this' type from static method?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 1094, __PRETTY_FUNCTION__))
1094 "Trying to get 'this' type from static method?")((isa<CXXRecordDecl>(DC) && "Trying to get 'this' type from static method?"
) ? static_cast<void> (0) : __assert_fail ("isa<CXXRecordDecl>(DC) && \"Trying to get 'this' type from static method?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 1094, __PRETTY_FUNCTION__))
;
1095
1096 // This is a lambda call operator that is being instantiated as a default
1097 // initializer. DC must point to the enclosing class type, so we can recover
1098 // the 'this' type from it.
1099
1100 QualType ClassTy = Context.getTypeDeclType(cast<CXXRecordDecl>(DC));
1101 // There are no cv-qualifiers for 'this' within default initializers,
1102 // per [expr.prim.general]p4.
1103 ThisTy = Context.getPointerType(ClassTy);
1104 }
1105
1106 // If we are within a lambda's call operator, the cv-qualifiers of 'this'
1107 // might need to be adjusted if the lambda or any of its enclosing lambda's
1108 // captures '*this' by copy.
1109 if (!ThisTy.isNull() && isLambdaCallOperator(CurContext))
1110 return adjustCVQualifiersForCXXThisWithinLambda(FunctionScopes, ThisTy,
1111 CurContext, Context);
1112 return ThisTy;
1113}
1114
1115Sema::CXXThisScopeRAII::CXXThisScopeRAII(Sema &S,
1116 Decl *ContextDecl,
1117 Qualifiers CXXThisTypeQuals,
1118 bool Enabled)
1119 : S(S), OldCXXThisTypeOverride(S.CXXThisTypeOverride), Enabled(false)
1120{
1121 if (!Enabled || !ContextDecl)
1122 return;
1123
1124 CXXRecordDecl *Record = nullptr;
1125 if (ClassTemplateDecl *Template = dyn_cast<ClassTemplateDecl>(ContextDecl))
1126 Record = Template->getTemplatedDecl();
1127 else
1128 Record = cast<CXXRecordDecl>(ContextDecl);
1129
1130 QualType T = S.Context.getRecordType(Record);
1131 T = S.getASTContext().getQualifiedType(T, CXXThisTypeQuals);
1132
1133 S.CXXThisTypeOverride = S.Context.getPointerType(T);
1134
1135 this->Enabled = true;
1136}
1137
1138
1139Sema::CXXThisScopeRAII::~CXXThisScopeRAII() {
1140 if (Enabled) {
1141 S.CXXThisTypeOverride = OldCXXThisTypeOverride;
1142 }
1143}
1144
1145bool Sema::CheckCXXThisCapture(SourceLocation Loc, const bool Explicit,
1146 bool BuildAndDiagnose, const unsigned *const FunctionScopeIndexToStopAt,
1147 const bool ByCopy) {
1148 // We don't need to capture this in an unevaluated context.
1149 if (isUnevaluatedContext() && !Explicit)
1150 return true;
1151
1152 assert((!ByCopy || Explicit) && "cannot implicitly capture *this by value")(((!ByCopy || Explicit) && "cannot implicitly capture *this by value"
) ? static_cast<void> (0) : __assert_fail ("(!ByCopy || Explicit) && \"cannot implicitly capture *this by value\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 1152, __PRETTY_FUNCTION__))
;
1153
1154 const int MaxFunctionScopesIndex = FunctionScopeIndexToStopAt
1155 ? *FunctionScopeIndexToStopAt
1156 : FunctionScopes.size() - 1;
1157
1158 // Check that we can capture the *enclosing object* (referred to by '*this')
1159 // by the capturing-entity/closure (lambda/block/etc) at
1160 // MaxFunctionScopesIndex-deep on the FunctionScopes stack.
1161
1162 // Note: The *enclosing object* can only be captured by-value by a
1163 // closure that is a lambda, using the explicit notation:
1164 // [*this] { ... }.
1165 // Every other capture of the *enclosing object* results in its by-reference
1166 // capture.
1167
1168 // For a closure 'L' (at MaxFunctionScopesIndex in the FunctionScopes
1169 // stack), we can capture the *enclosing object* only if:
1170 // - 'L' has an explicit byref or byval capture of the *enclosing object*
1171 // - or, 'L' has an implicit capture.
1172 // AND
1173 // -- there is no enclosing closure
1174 // -- or, there is some enclosing closure 'E' that has already captured the
1175 // *enclosing object*, and every intervening closure (if any) between 'E'
1176 // and 'L' can implicitly capture the *enclosing object*.
1177 // -- or, every enclosing closure can implicitly capture the
1178 // *enclosing object*
1179
1180
1181 unsigned NumCapturingClosures = 0;
1182 for (int idx = MaxFunctionScopesIndex; idx >= 0; idx--) {
1183 if (CapturingScopeInfo *CSI =
1184 dyn_cast<CapturingScopeInfo>(FunctionScopes[idx])) {
1185 if (CSI->CXXThisCaptureIndex != 0) {
1186 // 'this' is already being captured; there isn't anything more to do.
1187 CSI->Captures[CSI->CXXThisCaptureIndex - 1].markUsed(BuildAndDiagnose);
1188 break;
1189 }
1190 LambdaScopeInfo *LSI = dyn_cast<LambdaScopeInfo>(CSI);
1191 if (LSI && isGenericLambdaCallOperatorSpecialization(LSI->CallOperator)) {
1192 // This context can't implicitly capture 'this'; fail out.
1193 if (BuildAndDiagnose)
1194 Diag(Loc, diag::err_this_capture)
1195 << (Explicit && idx == MaxFunctionScopesIndex);
1196 return true;
1197 }
1198 if (CSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_LambdaByref ||
1199 CSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_LambdaByval ||
1200 CSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_Block ||
1201 CSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_CapturedRegion ||
1202 (Explicit && idx == MaxFunctionScopesIndex)) {
1203 // Regarding (Explicit && idx == MaxFunctionScopesIndex): only the first
1204 // iteration through can be an explicit capture, all enclosing closures,
1205 // if any, must perform implicit captures.
1206
1207 // This closure can capture 'this'; continue looking upwards.
1208 NumCapturingClosures++;
1209 continue;
1210 }
1211 // This context can't implicitly capture 'this'; fail out.
1212 if (BuildAndDiagnose)
1213 Diag(Loc, diag::err_this_capture)
1214 << (Explicit && idx == MaxFunctionScopesIndex);
1215 return true;
1216 }
1217 break;
1218 }
1219 if (!BuildAndDiagnose) return false;
1220
1221 // If we got here, then the closure at MaxFunctionScopesIndex on the
1222 // FunctionScopes stack, can capture the *enclosing object*, so capture it
1223 // (including implicit by-reference captures in any enclosing closures).
1224
1225 // In the loop below, respect the ByCopy flag only for the closure requesting
1226 // the capture (i.e. first iteration through the loop below). Ignore it for
1227 // all enclosing closure's up to NumCapturingClosures (since they must be
1228 // implicitly capturing the *enclosing object* by reference (see loop
1229 // above)).
1230 assert((!ByCopy ||(((!ByCopy || dyn_cast<LambdaScopeInfo>(FunctionScopes[
MaxFunctionScopesIndex])) && "Only a lambda can capture the enclosing object (referred to by "
"*this) by copy") ? static_cast<void> (0) : __assert_fail
("(!ByCopy || dyn_cast<LambdaScopeInfo>(FunctionScopes[MaxFunctionScopesIndex])) && \"Only a lambda can capture the enclosing object (referred to by \" \"*this) by copy\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 1233, __PRETTY_FUNCTION__))
1231 dyn_cast<LambdaScopeInfo>(FunctionScopes[MaxFunctionScopesIndex])) &&(((!ByCopy || dyn_cast<LambdaScopeInfo>(FunctionScopes[
MaxFunctionScopesIndex])) && "Only a lambda can capture the enclosing object (referred to by "
"*this) by copy") ? static_cast<void> (0) : __assert_fail
("(!ByCopy || dyn_cast<LambdaScopeInfo>(FunctionScopes[MaxFunctionScopesIndex])) && \"Only a lambda can capture the enclosing object (referred to by \" \"*this) by copy\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 1233, __PRETTY_FUNCTION__))
1232 "Only a lambda can capture the enclosing object (referred to by "(((!ByCopy || dyn_cast<LambdaScopeInfo>(FunctionScopes[
MaxFunctionScopesIndex])) && "Only a lambda can capture the enclosing object (referred to by "
"*this) by copy") ? static_cast<void> (0) : __assert_fail
("(!ByCopy || dyn_cast<LambdaScopeInfo>(FunctionScopes[MaxFunctionScopesIndex])) && \"Only a lambda can capture the enclosing object (referred to by \" \"*this) by copy\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 1233, __PRETTY_FUNCTION__))
1233 "*this) by copy")(((!ByCopy || dyn_cast<LambdaScopeInfo>(FunctionScopes[
MaxFunctionScopesIndex])) && "Only a lambda can capture the enclosing object (referred to by "
"*this) by copy") ? static_cast<void> (0) : __assert_fail
("(!ByCopy || dyn_cast<LambdaScopeInfo>(FunctionScopes[MaxFunctionScopesIndex])) && \"Only a lambda can capture the enclosing object (referred to by \" \"*this) by copy\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 1233, __PRETTY_FUNCTION__))
;
1234 QualType ThisTy = getCurrentThisType();
1235 for (int idx = MaxFunctionScopesIndex; NumCapturingClosures;
1236 --idx, --NumCapturingClosures) {
1237 CapturingScopeInfo *CSI = cast<CapturingScopeInfo>(FunctionScopes[idx]);
1238
1239 // The type of the corresponding data member (not a 'this' pointer if 'by
1240 // copy').
1241 QualType CaptureType = ThisTy;
1242 if (ByCopy) {
1243 // If we are capturing the object referred to by '*this' by copy, ignore
1244 // any cv qualifiers inherited from the type of the member function for
1245 // the type of the closure-type's corresponding data member and any use
1246 // of 'this'.
1247 CaptureType = ThisTy->getPointeeType();
1248 CaptureType.removeLocalCVRQualifiers(Qualifiers::CVRMask);
1249 }
1250
1251 bool isNested = NumCapturingClosures > 1;
1252 CSI->addThisCapture(isNested, Loc, CaptureType, ByCopy);
1253 }
1254 return false;
1255}
1256
1257ExprResult Sema::ActOnCXXThis(SourceLocation Loc) {
1258 /// C++ 9.3.2: In the body of a non-static member function, the keyword this
1259 /// is a non-lvalue expression whose value is the address of the object for
1260 /// which the function is called.
1261
1262 QualType ThisTy = getCurrentThisType();
1263 if (ThisTy.isNull())
1264 return Diag(Loc, diag::err_invalid_this_use);
1265 return BuildCXXThisExpr(Loc, ThisTy, /*IsImplicit=*/false);
1266}
1267
1268Expr *Sema::BuildCXXThisExpr(SourceLocation Loc, QualType Type,
1269 bool IsImplicit) {
1270 auto *This = new (Context) CXXThisExpr(Loc, Type, IsImplicit);
1271 MarkThisReferenced(This);
1272 return This;
1273}
1274
1275void Sema::MarkThisReferenced(CXXThisExpr *This) {
1276 CheckCXXThisCapture(This->getExprLoc());
1277}
1278
1279bool Sema::isThisOutsideMemberFunctionBody(QualType BaseType) {
1280 // If we're outside the body of a member function, then we'll have a specified
1281 // type for 'this'.
1282 if (CXXThisTypeOverride.isNull())
1283 return false;
1284
1285 // Determine whether we're looking into a class that's currently being
1286 // defined.
1287 CXXRecordDecl *Class = BaseType->getAsCXXRecordDecl();
1288 return Class && Class->isBeingDefined();
1289}
1290
1291/// Parse construction of a specified type.
1292/// Can be interpreted either as function-style casting ("int(x)")
1293/// or class type construction ("ClassType(x,y,z)")
1294/// or creation of a value-initialized type ("int()").
1295ExprResult
1296Sema::ActOnCXXTypeConstructExpr(ParsedType TypeRep,
1297 SourceLocation LParenOrBraceLoc,
1298 MultiExprArg exprs,
1299 SourceLocation RParenOrBraceLoc,
1300 bool ListInitialization) {
1301 if (!TypeRep)
1302 return ExprError();
1303
1304 TypeSourceInfo *TInfo;
1305 QualType Ty = GetTypeFromParser(TypeRep, &TInfo);
1306 if (!TInfo)
1307 TInfo = Context.getTrivialTypeSourceInfo(Ty, SourceLocation());
1308
1309 auto Result = BuildCXXTypeConstructExpr(TInfo, LParenOrBraceLoc, exprs,
1310 RParenOrBraceLoc, ListInitialization);
1311 // Avoid creating a non-type-dependent expression that contains typos.
1312 // Non-type-dependent expressions are liable to be discarded without
1313 // checking for embedded typos.
1314 if (!Result.isInvalid() && Result.get()->isInstantiationDependent() &&
1315 !Result.get()->isTypeDependent())
1316 Result = CorrectDelayedTyposInExpr(Result.get());
1317 return Result;
1318}
1319
1320ExprResult
1321Sema::BuildCXXTypeConstructExpr(TypeSourceInfo *TInfo,
1322 SourceLocation LParenOrBraceLoc,
1323 MultiExprArg Exprs,
1324 SourceLocation RParenOrBraceLoc,
1325 bool ListInitialization) {
1326 QualType Ty = TInfo->getType();
1327 SourceLocation TyBeginLoc = TInfo->getTypeLoc().getBeginLoc();
1328
1329 if (Ty->isDependentType() || CallExpr::hasAnyTypeDependentArguments(Exprs)) {
1330 // FIXME: CXXUnresolvedConstructExpr does not model list-initialization
1331 // directly. We work around this by dropping the locations of the braces.
1332 SourceRange Locs = ListInitialization
1333 ? SourceRange()
1334 : SourceRange(LParenOrBraceLoc, RParenOrBraceLoc);
1335 return CXXUnresolvedConstructExpr::Create(Context, TInfo, Locs.getBegin(),
1336 Exprs, Locs.getEnd());
1337 }
1338
1339 assert((!ListInitialization ||(((!ListInitialization || (Exprs.size() == 1 && isa<
InitListExpr>(Exprs[0]))) && "List initialization must have initializer list as expression."
) ? static_cast<void> (0) : __assert_fail ("(!ListInitialization || (Exprs.size() == 1 && isa<InitListExpr>(Exprs[0]))) && \"List initialization must have initializer list as expression.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 1341, __PRETTY_FUNCTION__))
1340 (Exprs.size() == 1 && isa<InitListExpr>(Exprs[0]))) &&(((!ListInitialization || (Exprs.size() == 1 && isa<
InitListExpr>(Exprs[0]))) && "List initialization must have initializer list as expression."
) ? static_cast<void> (0) : __assert_fail ("(!ListInitialization || (Exprs.size() == 1 && isa<InitListExpr>(Exprs[0]))) && \"List initialization must have initializer list as expression.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 1341, __PRETTY_FUNCTION__))
1341 "List initialization must have initializer list as expression.")(((!ListInitialization || (Exprs.size() == 1 && isa<
InitListExpr>(Exprs[0]))) && "List initialization must have initializer list as expression."
) ? static_cast<void> (0) : __assert_fail ("(!ListInitialization || (Exprs.size() == 1 && isa<InitListExpr>(Exprs[0]))) && \"List initialization must have initializer list as expression.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 1341, __PRETTY_FUNCTION__))
;
1342 SourceRange FullRange = SourceRange(TyBeginLoc, RParenOrBraceLoc);
1343
1344 InitializedEntity Entity = InitializedEntity::InitializeTemporary(TInfo);
1345 InitializationKind Kind =
1346 Exprs.size()
1347 ? ListInitialization
1348 ? InitializationKind::CreateDirectList(
1349 TyBeginLoc, LParenOrBraceLoc, RParenOrBraceLoc)
1350 : InitializationKind::CreateDirect(TyBeginLoc, LParenOrBraceLoc,
1351 RParenOrBraceLoc)
1352 : InitializationKind::CreateValue(TyBeginLoc, LParenOrBraceLoc,
1353 RParenOrBraceLoc);
1354
1355 // C++1z [expr.type.conv]p1:
1356 // If the type is a placeholder for a deduced class type, [...perform class
1357 // template argument deduction...]
1358 DeducedType *Deduced = Ty->getContainedDeducedType();
1359 if (Deduced && isa<DeducedTemplateSpecializationType>(Deduced)) {
1360 Ty = DeduceTemplateSpecializationFromInitializer(TInfo, Entity,
1361 Kind, Exprs);
1362 if (Ty.isNull())
1363 return ExprError();
1364 Entity = InitializedEntity::InitializeTemporary(TInfo, Ty);
1365 }
1366
1367 // C++ [expr.type.conv]p1:
1368 // If the expression list is a parenthesized single expression, the type
1369 // conversion expression is equivalent (in definedness, and if defined in
1370 // meaning) to the corresponding cast expression.
1371 if (Exprs.size() == 1 && !ListInitialization &&
1372 !isa<InitListExpr>(Exprs[0])) {
1373 Expr *Arg = Exprs[0];
1374 return BuildCXXFunctionalCastExpr(TInfo, Ty, LParenOrBraceLoc, Arg,
1375 RParenOrBraceLoc);
1376 }
1377
1378 // For an expression of the form T(), T shall not be an array type.
1379 QualType ElemTy = Ty;
1380 if (Ty->isArrayType()) {
1381 if (!ListInitialization)
1382 return ExprError(Diag(TyBeginLoc, diag::err_value_init_for_array_type)
1383 << FullRange);
1384 ElemTy = Context.getBaseElementType(Ty);
1385 }
1386
1387 // There doesn't seem to be an explicit rule against this but sanity demands
1388 // we only construct objects with object types.
1389 if (Ty->isFunctionType())
1390 return ExprError(Diag(TyBeginLoc, diag::err_init_for_function_type)
1391 << Ty << FullRange);
1392
1393 // C++17 [expr.type.conv]p2:
1394 // If the type is cv void and the initializer is (), the expression is a
1395 // prvalue of the specified type that performs no initialization.
1396 if (!Ty->isVoidType() &&
1397 RequireCompleteType(TyBeginLoc, ElemTy,
1398 diag::err_invalid_incomplete_type_use, FullRange))
1399 return ExprError();
1400
1401 // Otherwise, the expression is a prvalue of the specified type whose
1402 // result object is direct-initialized (11.6) with the initializer.
1403 InitializationSequence InitSeq(*this, Entity, Kind, Exprs);
1404 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Exprs);
1405
1406 if (Result.isInvalid())
1407 return Result;
1408
1409 Expr *Inner = Result.get();
1410 if (CXXBindTemporaryExpr *BTE = dyn_cast_or_null<CXXBindTemporaryExpr>(Inner))
1411 Inner = BTE->getSubExpr();
1412 if (!isa<CXXTemporaryObjectExpr>(Inner) &&
1413 !isa<CXXScalarValueInitExpr>(Inner)) {
1414 // If we created a CXXTemporaryObjectExpr, that node also represents the
1415 // functional cast. Otherwise, create an explicit cast to represent
1416 // the syntactic form of a functional-style cast that was used here.
1417 //
1418 // FIXME: Creating a CXXFunctionalCastExpr around a CXXConstructExpr
1419 // would give a more consistent AST representation than using a
1420 // CXXTemporaryObjectExpr. It's also weird that the functional cast
1421 // is sometimes handled by initialization and sometimes not.
1422 QualType ResultType = Result.get()->getType();
1423 SourceRange Locs = ListInitialization
1424 ? SourceRange()
1425 : SourceRange(LParenOrBraceLoc, RParenOrBraceLoc);
1426 Result = CXXFunctionalCastExpr::Create(
1427 Context, ResultType, Expr::getValueKindForType(Ty), TInfo, CK_NoOp,
1428 Result.get(), /*Path=*/nullptr, Locs.getBegin(), Locs.getEnd());
1429 }
1430
1431 return Result;
1432}
1433
1434bool Sema::isUsualDeallocationFunction(const CXXMethodDecl *Method) {
1435 // [CUDA] Ignore this function, if we can't call it.
1436 const FunctionDecl *Caller = dyn_cast<FunctionDecl>(CurContext);
1437 if (getLangOpts().CUDA &&
1438 IdentifyCUDAPreference(Caller, Method) <= CFP_WrongSide)
1439 return false;
1440
1441 SmallVector<const FunctionDecl*, 4> PreventedBy;
1442 bool Result = Method->isUsualDeallocationFunction(PreventedBy);
1443
1444 if (Result || !getLangOpts().CUDA || PreventedBy.empty())
1445 return Result;
1446
1447 // In case of CUDA, return true if none of the 1-argument deallocator
1448 // functions are actually callable.
1449 return llvm::none_of(PreventedBy, [&](const FunctionDecl *FD) {
1450 assert(FD->getNumParams() == 1 &&((FD->getNumParams() == 1 && "Only single-operand functions should be in PreventedBy"
) ? static_cast<void> (0) : __assert_fail ("FD->getNumParams() == 1 && \"Only single-operand functions should be in PreventedBy\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 1451, __PRETTY_FUNCTION__))
1451 "Only single-operand functions should be in PreventedBy")((FD->getNumParams() == 1 && "Only single-operand functions should be in PreventedBy"
) ? static_cast<void> (0) : __assert_fail ("FD->getNumParams() == 1 && \"Only single-operand functions should be in PreventedBy\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 1451, __PRETTY_FUNCTION__))
;
1452 return IdentifyCUDAPreference(Caller, FD) >= CFP_HostDevice;
1453 });
1454}
1455
1456/// Determine whether the given function is a non-placement
1457/// deallocation function.
1458static bool isNonPlacementDeallocationFunction(Sema &S, FunctionDecl *FD) {
1459 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD))
1460 return S.isUsualDeallocationFunction(Method);
1461
1462 if (FD->getOverloadedOperator() != OO_Delete &&
1463 FD->getOverloadedOperator() != OO_Array_Delete)
1464 return false;
1465
1466 unsigned UsualParams = 1;
1467
1468 if (S.getLangOpts().SizedDeallocation && UsualParams < FD->getNumParams() &&
1469 S.Context.hasSameUnqualifiedType(
1470 FD->getParamDecl(UsualParams)->getType(),
1471 S.Context.getSizeType()))
1472 ++UsualParams;
1473
1474 if (S.getLangOpts().AlignedAllocation && UsualParams < FD->getNumParams() &&
1475 S.Context.hasSameUnqualifiedType(
1476 FD->getParamDecl(UsualParams)->getType(),
1477 S.Context.getTypeDeclType(S.getStdAlignValT())))
1478 ++UsualParams;
1479
1480 return UsualParams == FD->getNumParams();
1481}
1482
1483namespace {
1484 struct UsualDeallocFnInfo {
1485 UsualDeallocFnInfo() : Found(), FD(nullptr) {}
1486 UsualDeallocFnInfo(Sema &S, DeclAccessPair Found)
1487 : Found(Found), FD(dyn_cast<FunctionDecl>(Found->getUnderlyingDecl())),
1488 Destroying(false), HasSizeT(false), HasAlignValT(false),
1489 CUDAPref(Sema::CFP_Native) {
1490 // A function template declaration is never a usual deallocation function.
1491 if (!FD)
1492 return;
1493 unsigned NumBaseParams = 1;
1494 if (FD->isDestroyingOperatorDelete()) {
1495 Destroying = true;
1496 ++NumBaseParams;
1497 }
1498
1499 if (NumBaseParams < FD->getNumParams() &&
1500 S.Context.hasSameUnqualifiedType(
1501 FD->getParamDecl(NumBaseParams)->getType(),
1502 S.Context.getSizeType())) {
1503 ++NumBaseParams;
1504 HasSizeT = true;
1505 }
1506
1507 if (NumBaseParams < FD->getNumParams() &&
1508 FD->getParamDecl(NumBaseParams)->getType()->isAlignValT()) {
1509 ++NumBaseParams;
1510 HasAlignValT = true;
1511 }
1512
1513 // In CUDA, determine how much we'd like / dislike to call this.
1514 if (S.getLangOpts().CUDA)
1515 if (auto *Caller = dyn_cast<FunctionDecl>(S.CurContext))
1516 CUDAPref = S.IdentifyCUDAPreference(Caller, FD);
1517 }
1518
1519 explicit operator bool() const { return FD; }
1520
1521 bool isBetterThan(const UsualDeallocFnInfo &Other, bool WantSize,
1522 bool WantAlign) const {
1523 // C++ P0722:
1524 // A destroying operator delete is preferred over a non-destroying
1525 // operator delete.
1526 if (Destroying != Other.Destroying)
1527 return Destroying;
1528
1529 // C++17 [expr.delete]p10:
1530 // If the type has new-extended alignment, a function with a parameter
1531 // of type std::align_val_t is preferred; otherwise a function without
1532 // such a parameter is preferred
1533 if (HasAlignValT != Other.HasAlignValT)
1534 return HasAlignValT == WantAlign;
1535
1536 if (HasSizeT != Other.HasSizeT)
1537 return HasSizeT == WantSize;
1538
1539 // Use CUDA call preference as a tiebreaker.
1540 return CUDAPref > Other.CUDAPref;
1541 }
1542
1543 DeclAccessPair Found;
1544 FunctionDecl *FD;
1545 bool Destroying, HasSizeT, HasAlignValT;
1546 Sema::CUDAFunctionPreference CUDAPref;
1547 };
1548}
1549
1550/// Determine whether a type has new-extended alignment. This may be called when
1551/// the type is incomplete (for a delete-expression with an incomplete pointee
1552/// type), in which case it will conservatively return false if the alignment is
1553/// not known.
1554static bool hasNewExtendedAlignment(Sema &S, QualType AllocType) {
1555 return S.getLangOpts().AlignedAllocation &&
1556 S.getASTContext().getTypeAlignIfKnown(AllocType) >
1557 S.getASTContext().getTargetInfo().getNewAlign();
1558}
1559
1560/// Select the correct "usual" deallocation function to use from a selection of
1561/// deallocation functions (either global or class-scope).
1562static UsualDeallocFnInfo resolveDeallocationOverload(
1563 Sema &S, LookupResult &R, bool WantSize, bool WantAlign,
1564 llvm::SmallVectorImpl<UsualDeallocFnInfo> *BestFns = nullptr) {
1565 UsualDeallocFnInfo Best;
1566
1567 for (auto I = R.begin(), E = R.end(); I != E; ++I) {
1568 UsualDeallocFnInfo Info(S, I.getPair());
1569 if (!Info || !isNonPlacementDeallocationFunction(S, Info.FD) ||
1570 Info.CUDAPref == Sema::CFP_Never)
1571 continue;
1572
1573 if (!Best) {
1574 Best = Info;
1575 if (BestFns)
1576 BestFns->push_back(Info);
1577 continue;
1578 }
1579
1580 if (Best.isBetterThan(Info, WantSize, WantAlign))
1581 continue;
1582
1583 // If more than one preferred function is found, all non-preferred
1584 // functions are eliminated from further consideration.
1585 if (BestFns && Info.isBetterThan(Best, WantSize, WantAlign))
1586 BestFns->clear();
1587
1588 Best = Info;
1589 if (BestFns)
1590 BestFns->push_back(Info);
1591 }
1592
1593 return Best;
1594}
1595
1596/// Determine whether a given type is a class for which 'delete[]' would call
1597/// a member 'operator delete[]' with a 'size_t' parameter. This implies that
1598/// we need to store the array size (even if the type is
1599/// trivially-destructible).
1600static bool doesUsualArrayDeleteWantSize(Sema &S, SourceLocation loc,
1601 QualType allocType) {
1602 const RecordType *record =
1603 allocType->getBaseElementTypeUnsafe()->getAs<RecordType>();
1604 if (!record) return false;
1605
1606 // Try to find an operator delete[] in class scope.
1607
1608 DeclarationName deleteName =
1609 S.Context.DeclarationNames.getCXXOperatorName(OO_Array_Delete);
1610 LookupResult ops(S, deleteName, loc, Sema::LookupOrdinaryName);
1611 S.LookupQualifiedName(ops, record->getDecl());
1612
1613 // We're just doing this for information.
1614 ops.suppressDiagnostics();
1615
1616 // Very likely: there's no operator delete[].
1617 if (ops.empty()) return false;
1618
1619 // If it's ambiguous, it should be illegal to call operator delete[]
1620 // on this thing, so it doesn't matter if we allocate extra space or not.
1621 if (ops.isAmbiguous()) return false;
1622
1623 // C++17 [expr.delete]p10:
1624 // If the deallocation functions have class scope, the one without a
1625 // parameter of type std::size_t is selected.
1626 auto Best = resolveDeallocationOverload(
1627 S, ops, /*WantSize*/false,
1628 /*WantAlign*/hasNewExtendedAlignment(S, allocType));
1629 return Best && Best.HasSizeT;
1630}
1631
1632/// Parsed a C++ 'new' expression (C++ 5.3.4).
1633///
1634/// E.g.:
1635/// @code new (memory) int[size][4] @endcode
1636/// or
1637/// @code ::new Foo(23, "hello") @endcode
1638///
1639/// \param StartLoc The first location of the expression.
1640/// \param UseGlobal True if 'new' was prefixed with '::'.
1641/// \param PlacementLParen Opening paren of the placement arguments.
1642/// \param PlacementArgs Placement new arguments.
1643/// \param PlacementRParen Closing paren of the placement arguments.
1644/// \param TypeIdParens If the type is in parens, the source range.
1645/// \param D The type to be allocated, as well as array dimensions.
1646/// \param Initializer The initializing expression or initializer-list, or null
1647/// if there is none.
1648ExprResult
1649Sema::ActOnCXXNew(SourceLocation StartLoc, bool UseGlobal,
1650 SourceLocation PlacementLParen, MultiExprArg PlacementArgs,
1651 SourceLocation PlacementRParen, SourceRange TypeIdParens,
1652 Declarator &D, Expr *Initializer) {
1653 Optional<Expr *> ArraySize;
1654 // If the specified type is an array, unwrap it and save the expression.
1655 if (D.getNumTypeObjects() > 0 &&
1656 D.getTypeObject(0).Kind == DeclaratorChunk::Array) {
1657 DeclaratorChunk &Chunk = D.getTypeObject(0);
1658 if (D.getDeclSpec().hasAutoTypeSpec())
1659 return ExprError(Diag(Chunk.Loc, diag::err_new_array_of_auto)
1660 << D.getSourceRange());
1661 if (Chunk.Arr.hasStatic)
1662 return ExprError(Diag(Chunk.Loc, diag::err_static_illegal_in_new)
1663 << D.getSourceRange());
1664 if (!Chunk.Arr.NumElts && !Initializer)
1665 return ExprError(Diag(Chunk.Loc, diag::err_array_new_needs_size)
1666 << D.getSourceRange());
1667
1668 ArraySize = static_cast<Expr*>(Chunk.Arr.NumElts);
1669 D.DropFirstTypeObject();
1670 }
1671
1672 // Every dimension shall be of constant size.
1673 if (ArraySize) {
1674 for (unsigned I = 0, N = D.getNumTypeObjects(); I < N; ++I) {
1675 if (D.getTypeObject(I).Kind != DeclaratorChunk::Array)
1676 break;
1677
1678 DeclaratorChunk::ArrayTypeInfo &Array = D.getTypeObject(I).Arr;
1679 if (Expr *NumElts = (Expr *)Array.NumElts) {
1680 if (!NumElts->isTypeDependent() && !NumElts->isValueDependent()) {
1681 if (getLangOpts().CPlusPlus14) {
1682 // C++1y [expr.new]p6: Every constant-expression in a noptr-new-declarator
1683 // shall be a converted constant expression (5.19) of type std::size_t
1684 // and shall evaluate to a strictly positive value.
1685 unsigned IntWidth = Context.getTargetInfo().getIntWidth();
1686 assert(IntWidth && "Builtin type of size 0?")((IntWidth && "Builtin type of size 0?") ? static_cast
<void> (0) : __assert_fail ("IntWidth && \"Builtin type of size 0?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 1686, __PRETTY_FUNCTION__))
;
1687 llvm::APSInt Value(IntWidth);
1688 Array.NumElts
1689 = CheckConvertedConstantExpression(NumElts, Context.getSizeType(), Value,
1690 CCEK_NewExpr)
1691 .get();
1692 } else {
1693 Array.NumElts
1694 = VerifyIntegerConstantExpression(NumElts, nullptr,
1695 diag::err_new_array_nonconst)
1696 .get();
1697 }
1698 if (!Array.NumElts)
1699 return ExprError();
1700 }
1701 }
1702 }
1703 }
1704
1705 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, /*Scope=*/nullptr);
1706 QualType AllocType = TInfo->getType();
1707 if (D.isInvalidType())
1708 return ExprError();
1709
1710 SourceRange DirectInitRange;
1711 if (ParenListExpr *List = dyn_cast_or_null<ParenListExpr>(Initializer))
1712 DirectInitRange = List->getSourceRange();
1713
1714 return BuildCXXNew(SourceRange(StartLoc, D.getEndLoc()), UseGlobal,
1715 PlacementLParen, PlacementArgs, PlacementRParen,
1716 TypeIdParens, AllocType, TInfo, ArraySize, DirectInitRange,
1717 Initializer);
1718}
1719
1720static bool isLegalArrayNewInitializer(CXXNewExpr::InitializationStyle Style,
1721 Expr *Init) {
1722 if (!Init)
1723 return true;
1724 if (ParenListExpr *PLE = dyn_cast<ParenListExpr>(Init))
1725 return PLE->getNumExprs() == 0;
1726 if (isa<ImplicitValueInitExpr>(Init))
1727 return true;
1728 else if (CXXConstructExpr *CCE = dyn_cast<CXXConstructExpr>(Init))
1729 return !CCE->isListInitialization() &&
1730 CCE->getConstructor()->isDefaultConstructor();
1731 else if (Style == CXXNewExpr::ListInit) {
1732 assert(isa<InitListExpr>(Init) &&((isa<InitListExpr>(Init) && "Shouldn't create list CXXConstructExprs for arrays."
) ? static_cast<void> (0) : __assert_fail ("isa<InitListExpr>(Init) && \"Shouldn't create list CXXConstructExprs for arrays.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 1733, __PRETTY_FUNCTION__))
1733 "Shouldn't create list CXXConstructExprs for arrays.")((isa<InitListExpr>(Init) && "Shouldn't create list CXXConstructExprs for arrays."
) ? static_cast<void> (0) : __assert_fail ("isa<InitListExpr>(Init) && \"Shouldn't create list CXXConstructExprs for arrays.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 1733, __PRETTY_FUNCTION__))
;
1734 return true;
1735 }
1736 return false;
1737}
1738
1739bool
1740Sema::isUnavailableAlignedAllocationFunction(const FunctionDecl &FD) const {
1741 if (!getLangOpts().AlignedAllocationUnavailable)
1742 return false;
1743 if (FD.isDefined())
1744 return false;
1745 bool IsAligned = false;
1746 if (FD.isReplaceableGlobalAllocationFunction(&IsAligned) && IsAligned)
1747 return true;
1748 return false;
1749}
1750
1751// Emit a diagnostic if an aligned allocation/deallocation function that is not
1752// implemented in the standard library is selected.
1753void Sema::diagnoseUnavailableAlignedAllocation(const FunctionDecl &FD,
1754 SourceLocation Loc) {
1755 if (isUnavailableAlignedAllocationFunction(FD)) {
1756 const llvm::Triple &T = getASTContext().getTargetInfo().getTriple();
1757 StringRef OSName = AvailabilityAttr::getPlatformNameSourceSpelling(
1758 getASTContext().getTargetInfo().getPlatformName());
1759
1760 OverloadedOperatorKind Kind = FD.getDeclName().getCXXOverloadedOperator();
1761 bool IsDelete = Kind == OO_Delete || Kind == OO_Array_Delete;
1762 Diag(Loc, diag::err_aligned_allocation_unavailable)
1763 << IsDelete << FD.getType().getAsString() << OSName
1764 << alignedAllocMinVersion(T.getOS()).getAsString();
1765 Diag(Loc, diag::note_silence_aligned_allocation_unavailable);
1766 }
1767}
1768
1769ExprResult
1770Sema::BuildCXXNew(SourceRange Range, bool UseGlobal,
1771 SourceLocation PlacementLParen,
1772 MultiExprArg PlacementArgs,
1773 SourceLocation PlacementRParen,
1774 SourceRange TypeIdParens,
1775 QualType AllocType,
1776 TypeSourceInfo *AllocTypeInfo,
1777 Optional<Expr *> ArraySize,
1778 SourceRange DirectInitRange,
1779 Expr *Initializer) {
1780 SourceRange TypeRange = AllocTypeInfo->getTypeLoc().getSourceRange();
1781 SourceLocation StartLoc = Range.getBegin();
1782
1783 CXXNewExpr::InitializationStyle initStyle;
1784 if (DirectInitRange.isValid()) {
1785 assert(Initializer && "Have parens but no initializer.")((Initializer && "Have parens but no initializer.") ?
static_cast<void> (0) : __assert_fail ("Initializer && \"Have parens but no initializer.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 1785, __PRETTY_FUNCTION__))
;
1786 initStyle = CXXNewExpr::CallInit;
1787 } else if (Initializer && isa<InitListExpr>(Initializer))
1788 initStyle = CXXNewExpr::ListInit;
1789 else {
1790 assert((!Initializer || isa<ImplicitValueInitExpr>(Initializer) ||(((!Initializer || isa<ImplicitValueInitExpr>(Initializer
) || isa<CXXConstructExpr>(Initializer)) && "Initializer expression that cannot have been implicitly created."
) ? static_cast<void> (0) : __assert_fail ("(!Initializer || isa<ImplicitValueInitExpr>(Initializer) || isa<CXXConstructExpr>(Initializer)) && \"Initializer expression that cannot have been implicitly created.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 1792, __PRETTY_FUNCTION__))
1791 isa<CXXConstructExpr>(Initializer)) &&(((!Initializer || isa<ImplicitValueInitExpr>(Initializer
) || isa<CXXConstructExpr>(Initializer)) && "Initializer expression that cannot have been implicitly created."
) ? static_cast<void> (0) : __assert_fail ("(!Initializer || isa<ImplicitValueInitExpr>(Initializer) || isa<CXXConstructExpr>(Initializer)) && \"Initializer expression that cannot have been implicitly created.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 1792, __PRETTY_FUNCTION__))
1792 "Initializer expression that cannot have been implicitly created.")(((!Initializer || isa<ImplicitValueInitExpr>(Initializer
) || isa<CXXConstructExpr>(Initializer)) && "Initializer expression that cannot have been implicitly created."
) ? static_cast<void> (0) : __assert_fail ("(!Initializer || isa<ImplicitValueInitExpr>(Initializer) || isa<CXXConstructExpr>(Initializer)) && \"Initializer expression that cannot have been implicitly created.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 1792, __PRETTY_FUNCTION__))
;
1793 initStyle = CXXNewExpr::NoInit;
1794 }
1795
1796 Expr **Inits = &Initializer;
1797 unsigned NumInits = Initializer ? 1 : 0;
1798 if (ParenListExpr *List = dyn_cast_or_null<ParenListExpr>(Initializer)) {
1799 assert(initStyle == CXXNewExpr::CallInit && "paren init for non-call init")((initStyle == CXXNewExpr::CallInit && "paren init for non-call init"
) ? static_cast<void> (0) : __assert_fail ("initStyle == CXXNewExpr::CallInit && \"paren init for non-call init\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 1799, __PRETTY_FUNCTION__))
;
1800 Inits = List->getExprs();
1801 NumInits = List->getNumExprs();
1802 }
1803
1804 // C++11 [expr.new]p15:
1805 // A new-expression that creates an object of type T initializes that
1806 // object as follows:
1807 InitializationKind Kind
1808 // - If the new-initializer is omitted, the object is default-
1809 // initialized (8.5); if no initialization is performed,
1810 // the object has indeterminate value
1811 = initStyle == CXXNewExpr::NoInit
1812 ? InitializationKind::CreateDefault(TypeRange.getBegin())
1813 // - Otherwise, the new-initializer is interpreted according to
1814 // the
1815 // initialization rules of 8.5 for direct-initialization.
1816 : initStyle == CXXNewExpr::ListInit
1817 ? InitializationKind::CreateDirectList(
1818 TypeRange.getBegin(), Initializer->getBeginLoc(),
1819 Initializer->getEndLoc())
1820 : InitializationKind::CreateDirect(TypeRange.getBegin(),
1821 DirectInitRange.getBegin(),
1822 DirectInitRange.getEnd());
1823
1824 // C++11 [dcl.spec.auto]p6. Deduce the type which 'auto' stands in for.
1825 auto *Deduced = AllocType->getContainedDeducedType();
1826 if (Deduced && isa<DeducedTemplateSpecializationType>(Deduced)) {
1827 if (ArraySize)
1828 return ExprError(
1829 Diag(ArraySize ? (*ArraySize)->getExprLoc() : TypeRange.getBegin(),
1830 diag::err_deduced_class_template_compound_type)
1831 << /*array*/ 2
1832 << (ArraySize ? (*ArraySize)->getSourceRange() : TypeRange));
1833
1834 InitializedEntity Entity
1835 = InitializedEntity::InitializeNew(StartLoc, AllocType);
1836 AllocType = DeduceTemplateSpecializationFromInitializer(
1837 AllocTypeInfo, Entity, Kind, MultiExprArg(Inits, NumInits));
1838 if (AllocType.isNull())
1839 return ExprError();
1840 } else if (Deduced) {
1841 bool Braced = (initStyle == CXXNewExpr::ListInit);
1842 if (NumInits == 1) {
1843 if (auto p = dyn_cast_or_null<InitListExpr>(Inits[0])) {
1844 Inits = p->getInits();
1845 NumInits = p->getNumInits();
1846 Braced = true;
1847 }
1848 }
1849
1850 if (initStyle == CXXNewExpr::NoInit || NumInits == 0)
1851 return ExprError(Diag(StartLoc, diag::err_auto_new_requires_ctor_arg)
1852 << AllocType << TypeRange);
1853 if (NumInits > 1) {
1854 Expr *FirstBad = Inits[1];
1855 return ExprError(Diag(FirstBad->getBeginLoc(),
1856 diag::err_auto_new_ctor_multiple_expressions)
1857 << AllocType << TypeRange);
1858 }
1859 if (Braced && !getLangOpts().CPlusPlus17)
1860 Diag(Initializer->getBeginLoc(), diag::ext_auto_new_list_init)
1861 << AllocType << TypeRange;
1862 Expr *Deduce = Inits[0];
1863 QualType DeducedType;
1864 if (DeduceAutoType(AllocTypeInfo, Deduce, DeducedType) == DAR_Failed)
1865 return ExprError(Diag(StartLoc, diag::err_auto_new_deduction_failure)
1866 << AllocType << Deduce->getType()
1867 << TypeRange << Deduce->getSourceRange());
1868 if (DeducedType.isNull())
1869 return ExprError();
1870 AllocType = DeducedType;
1871 }
1872
1873 // Per C++0x [expr.new]p5, the type being constructed may be a
1874 // typedef of an array type.
1875 if (!ArraySize) {
1876 if (const ConstantArrayType *Array
1877 = Context.getAsConstantArrayType(AllocType)) {
1878 ArraySize = IntegerLiteral::Create(Context, Array->getSize(),
1879 Context.getSizeType(),
1880 TypeRange.getEnd());
1881 AllocType = Array->getElementType();
1882 }
1883 }
1884
1885 if (CheckAllocatedType(AllocType, TypeRange.getBegin(), TypeRange))
1886 return ExprError();
1887
1888 // In ARC, infer 'retaining' for the allocated
1889 if (getLangOpts().ObjCAutoRefCount &&
1890 AllocType.getObjCLifetime() == Qualifiers::OCL_None &&
1891 AllocType->isObjCLifetimeType()) {
1892 AllocType = Context.getLifetimeQualifiedType(AllocType,
1893 AllocType->getObjCARCImplicitLifetime());
1894 }
1895
1896 QualType ResultType = Context.getPointerType(AllocType);
1897
1898 if (ArraySize && *ArraySize &&
1899 (*ArraySize)->getType()->isNonOverloadPlaceholderType()) {
1900 ExprResult result = CheckPlaceholderExpr(*ArraySize);
1901 if (result.isInvalid()) return ExprError();
1902 ArraySize = result.get();
1903 }
1904 // C++98 5.3.4p6: "The expression in a direct-new-declarator shall have
1905 // integral or enumeration type with a non-negative value."
1906 // C++11 [expr.new]p6: The expression [...] shall be of integral or unscoped
1907 // enumeration type, or a class type for which a single non-explicit
1908 // conversion function to integral or unscoped enumeration type exists.
1909 // C++1y [expr.new]p6: The expression [...] is implicitly converted to
1910 // std::size_t.
1911 llvm::Optional<uint64_t> KnownArraySize;
1912 if (ArraySize && *ArraySize && !(*ArraySize)->isTypeDependent()) {
1913 ExprResult ConvertedSize;
1914 if (getLangOpts().CPlusPlus14) {
1915 assert(Context.getTargetInfo().getIntWidth() && "Builtin type of size 0?")((Context.getTargetInfo().getIntWidth() && "Builtin type of size 0?"
) ? static_cast<void> (0) : __assert_fail ("Context.getTargetInfo().getIntWidth() && \"Builtin type of size 0?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 1915, __PRETTY_FUNCTION__))
;
1916
1917 ConvertedSize = PerformImplicitConversion(*ArraySize, Context.getSizeType(),
1918 AA_Converting);
1919
1920 if (!ConvertedSize.isInvalid() &&
1921 (*ArraySize)->getType()->getAs<RecordType>())
1922 // Diagnose the compatibility of this conversion.
1923 Diag(StartLoc, diag::warn_cxx98_compat_array_size_conversion)
1924 << (*ArraySize)->getType() << 0 << "'size_t'";
1925 } else {
1926 class SizeConvertDiagnoser : public ICEConvertDiagnoser {
1927 protected:
1928 Expr *ArraySize;
1929
1930 public:
1931 SizeConvertDiagnoser(Expr *ArraySize)
1932 : ICEConvertDiagnoser(/*AllowScopedEnumerations*/false, false, false),
1933 ArraySize(ArraySize) {}
1934
1935 SemaDiagnosticBuilder diagnoseNotInt(Sema &S, SourceLocation Loc,
1936 QualType T) override {
1937 return S.Diag(Loc, diag::err_array_size_not_integral)
1938 << S.getLangOpts().CPlusPlus11 << T;
1939 }
1940
1941 SemaDiagnosticBuilder diagnoseIncomplete(
1942 Sema &S, SourceLocation Loc, QualType T) override {
1943 return S.Diag(Loc, diag::err_array_size_incomplete_type)
1944 << T << ArraySize->getSourceRange();
1945 }
1946
1947 SemaDiagnosticBuilder diagnoseExplicitConv(
1948 Sema &S, SourceLocation Loc, QualType T, QualType ConvTy) override {
1949 return S.Diag(Loc, diag::err_array_size_explicit_conversion) << T << ConvTy;
1950 }
1951
1952 SemaDiagnosticBuilder noteExplicitConv(
1953 Sema &S, CXXConversionDecl *Conv, QualType ConvTy) override {
1954 return S.Diag(Conv->getLocation(), diag::note_array_size_conversion)
1955 << ConvTy->isEnumeralType() << ConvTy;
1956 }
1957
1958 SemaDiagnosticBuilder diagnoseAmbiguous(
1959 Sema &S, SourceLocation Loc, QualType T) override {
1960 return S.Diag(Loc, diag::err_array_size_ambiguous_conversion) << T;
1961 }
1962
1963 SemaDiagnosticBuilder noteAmbiguous(
1964 Sema &S, CXXConversionDecl *Conv, QualType ConvTy) override {
1965 return S.Diag(Conv->getLocation(), diag::note_array_size_conversion)
1966 << ConvTy->isEnumeralType() << ConvTy;
1967 }
1968
1969 SemaDiagnosticBuilder diagnoseConversion(Sema &S, SourceLocation Loc,
1970 QualType T,
1971 QualType ConvTy) override {
1972 return S.Diag(Loc,
1973 S.getLangOpts().CPlusPlus11
1974 ? diag::warn_cxx98_compat_array_size_conversion
1975 : diag::ext_array_size_conversion)
1976 << T << ConvTy->isEnumeralType() << ConvTy;
1977 }
1978 } SizeDiagnoser(*ArraySize);
1979
1980 ConvertedSize = PerformContextualImplicitConversion(StartLoc, *ArraySize,
1981 SizeDiagnoser);
1982 }
1983 if (ConvertedSize.isInvalid())
1984 return ExprError();
1985
1986 ArraySize = ConvertedSize.get();
1987 QualType SizeType = (*ArraySize)->getType();
1988
1989 if (!SizeType->isIntegralOrUnscopedEnumerationType())
1990 return ExprError();
1991
1992 // C++98 [expr.new]p7:
1993 // The expression in a direct-new-declarator shall have integral type
1994 // with a non-negative value.
1995 //
1996 // Let's see if this is a constant < 0. If so, we reject it out of hand,
1997 // per CWG1464. Otherwise, if it's not a constant, we must have an
1998 // unparenthesized array type.
1999 if (!(*ArraySize)->isValueDependent()) {
2000 llvm::APSInt Value;
2001 // We've already performed any required implicit conversion to integer or
2002 // unscoped enumeration type.
2003 // FIXME: Per CWG1464, we are required to check the value prior to
2004 // converting to size_t. This will never find a negative array size in
2005 // C++14 onwards, because Value is always unsigned here!
2006 if ((*ArraySize)->isIntegerConstantExpr(Value, Context)) {
2007 if (Value.isSigned() && Value.isNegative()) {
2008 return ExprError(Diag((*ArraySize)->getBeginLoc(),
2009 diag::err_typecheck_negative_array_size)
2010 << (*ArraySize)->getSourceRange());
2011 }
2012
2013 if (!AllocType->isDependentType()) {
2014 unsigned ActiveSizeBits =
2015 ConstantArrayType::getNumAddressingBits(Context, AllocType, Value);
2016 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context))
2017 return ExprError(
2018 Diag((*ArraySize)->getBeginLoc(), diag::err_array_too_large)
2019 << Value.toString(10) << (*ArraySize)->getSourceRange());
2020 }
2021
2022 KnownArraySize = Value.getZExtValue();
2023 } else if (TypeIdParens.isValid()) {
2024 // Can't have dynamic array size when the type-id is in parentheses.
2025 Diag((*ArraySize)->getBeginLoc(), diag::ext_new_paren_array_nonconst)
2026 << (*ArraySize)->getSourceRange()
2027 << FixItHint::CreateRemoval(TypeIdParens.getBegin())
2028 << FixItHint::CreateRemoval(TypeIdParens.getEnd());
2029
2030 TypeIdParens = SourceRange();
2031 }
2032 }
2033
2034 // Note that we do *not* convert the argument in any way. It can
2035 // be signed, larger than size_t, whatever.
2036 }
2037
2038 FunctionDecl *OperatorNew = nullptr;
2039 FunctionDecl *OperatorDelete = nullptr;
2040 unsigned Alignment =
2041 AllocType->isDependentType() ? 0 : Context.getTypeAlign(AllocType);
2042 unsigned NewAlignment = Context.getTargetInfo().getNewAlign();
2043 bool PassAlignment = getLangOpts().AlignedAllocation &&
2044 Alignment > NewAlignment;
2045
2046 AllocationFunctionScope Scope = UseGlobal ? AFS_Global : AFS_Both;
2047 if (!AllocType->isDependentType() &&
2048 !Expr::hasAnyTypeDependentArguments(PlacementArgs) &&
2049 FindAllocationFunctions(
2050 StartLoc, SourceRange(PlacementLParen, PlacementRParen), Scope, Scope,
2051 AllocType, ArraySize.hasValue(), PassAlignment, PlacementArgs,
2052 OperatorNew, OperatorDelete))
2053 return ExprError();
2054
2055 // If this is an array allocation, compute whether the usual array
2056 // deallocation function for the type has a size_t parameter.
2057 bool UsualArrayDeleteWantsSize = false;
2058 if (ArraySize && !AllocType->isDependentType())
2059 UsualArrayDeleteWantsSize =
2060 doesUsualArrayDeleteWantSize(*this, StartLoc, AllocType);
2061
2062 SmallVector<Expr *, 8> AllPlaceArgs;
2063 if (OperatorNew) {
2064 const FunctionProtoType *Proto =
2065 OperatorNew->getType()->getAs<FunctionProtoType>();
2066 VariadicCallType CallType = Proto->isVariadic() ? VariadicFunction
2067 : VariadicDoesNotApply;
2068
2069 // We've already converted the placement args, just fill in any default
2070 // arguments. Skip the first parameter because we don't have a corresponding
2071 // argument. Skip the second parameter too if we're passing in the
2072 // alignment; we've already filled it in.
2073 if (GatherArgumentsForCall(PlacementLParen, OperatorNew, Proto,
2074 PassAlignment ? 2 : 1, PlacementArgs,
2075 AllPlaceArgs, CallType))
2076 return ExprError();
2077
2078 if (!AllPlaceArgs.empty())
2079 PlacementArgs = AllPlaceArgs;
2080
2081 // FIXME: This is wrong: PlacementArgs misses out the first (size) argument.
2082 DiagnoseSentinelCalls(OperatorNew, PlacementLParen, PlacementArgs);
2083
2084 // FIXME: Missing call to CheckFunctionCall or equivalent
2085
2086 // Warn if the type is over-aligned and is being allocated by (unaligned)
2087 // global operator new.
2088 if (PlacementArgs.empty() && !PassAlignment &&
2089 (OperatorNew->isImplicit() ||
2090 (OperatorNew->getBeginLoc().isValid() &&
2091 getSourceManager().isInSystemHeader(OperatorNew->getBeginLoc())))) {
2092 if (Alignment > NewAlignment)
2093 Diag(StartLoc, diag::warn_overaligned_type)
2094 << AllocType
2095 << unsigned(Alignment / Context.getCharWidth())
2096 << unsigned(NewAlignment / Context.getCharWidth());
2097 }
2098 }
2099
2100 // Array 'new' can't have any initializers except empty parentheses.
2101 // Initializer lists are also allowed, in C++11. Rely on the parser for the
2102 // dialect distinction.
2103 if (ArraySize && !isLegalArrayNewInitializer(initStyle, Initializer)) {
2104 SourceRange InitRange(Inits[0]->getBeginLoc(),
2105 Inits[NumInits - 1]->getEndLoc());
2106 Diag(StartLoc, diag::err_new_array_init_args) << InitRange;
2107 return ExprError();
2108 }
2109
2110 // If we can perform the initialization, and we've not already done so,
2111 // do it now.
2112 if (!AllocType->isDependentType() &&
2113 !Expr::hasAnyTypeDependentArguments(
2114 llvm::makeArrayRef(Inits, NumInits))) {
2115 // The type we initialize is the complete type, including the array bound.
2116 QualType InitType;
2117 if (KnownArraySize)
2118 InitType = Context.getConstantArrayType(
2119 AllocType,
2120 llvm::APInt(Context.getTypeSize(Context.getSizeType()),
2121 *KnownArraySize),
2122 *ArraySize, ArrayType::Normal, 0);
2123 else if (ArraySize)
2124 InitType =
2125 Context.getIncompleteArrayType(AllocType, ArrayType::Normal, 0);
2126 else
2127 InitType = AllocType;
2128
2129 InitializedEntity Entity
2130 = InitializedEntity::InitializeNew(StartLoc, InitType);
2131 InitializationSequence InitSeq(*this, Entity, Kind,
2132 MultiExprArg(Inits, NumInits));
2133 ExprResult FullInit = InitSeq.Perform(*this, Entity, Kind,
2134 MultiExprArg(Inits, NumInits));
2135 if (FullInit.isInvalid())
2136 return ExprError();
2137
2138 // FullInit is our initializer; strip off CXXBindTemporaryExprs, because
2139 // we don't want the initialized object to be destructed.
2140 // FIXME: We should not create these in the first place.
2141 if (CXXBindTemporaryExpr *Binder =
2142 dyn_cast_or_null<CXXBindTemporaryExpr>(FullInit.get()))
2143 FullInit = Binder->getSubExpr();
2144
2145 Initializer = FullInit.get();
2146
2147 // FIXME: If we have a KnownArraySize, check that the array bound of the
2148 // initializer is no greater than that constant value.
2149
2150 if (ArraySize && !*ArraySize) {
2151 auto *CAT = Context.getAsConstantArrayType(Initializer->getType());
2152 if (CAT) {
2153 // FIXME: Track that the array size was inferred rather than explicitly
2154 // specified.
2155 ArraySize = IntegerLiteral::Create(
2156 Context, CAT->getSize(), Context.getSizeType(), TypeRange.getEnd());
2157 } else {
2158 Diag(TypeRange.getEnd(), diag::err_new_array_size_unknown_from_init)
2159 << Initializer->getSourceRange();
2160 }
2161 }
2162 }
2163
2164 // Mark the new and delete operators as referenced.
2165 if (OperatorNew) {
2166 if (DiagnoseUseOfDecl(OperatorNew, StartLoc))
2167 return ExprError();
2168 MarkFunctionReferenced(StartLoc, OperatorNew);
2169 }
2170 if (OperatorDelete) {
2171 if (DiagnoseUseOfDecl(OperatorDelete, StartLoc))
2172 return ExprError();
2173 MarkFunctionReferenced(StartLoc, OperatorDelete);
2174 }
2175
2176 return CXXNewExpr::Create(Context, UseGlobal, OperatorNew, OperatorDelete,
2177 PassAlignment, UsualArrayDeleteWantsSize,
2178 PlacementArgs, TypeIdParens, ArraySize, initStyle,
2179 Initializer, ResultType, AllocTypeInfo, Range,
2180 DirectInitRange);
2181}
2182
2183/// Checks that a type is suitable as the allocated type
2184/// in a new-expression.
2185bool Sema::CheckAllocatedType(QualType AllocType, SourceLocation Loc,
2186 SourceRange R) {
2187 // C++ 5.3.4p1: "[The] type shall be a complete object type, but not an
2188 // abstract class type or array thereof.
2189 if (AllocType->isFunctionType())
2190 return Diag(Loc, diag::err_bad_new_type)
2191 << AllocType << 0 << R;
2192 else if (AllocType->isReferenceType())
2193 return Diag(Loc, diag::err_bad_new_type)
2194 << AllocType << 1 << R;
2195 else if (!AllocType->isDependentType() &&
2196 RequireCompleteType(Loc, AllocType, diag::err_new_incomplete_type,R))
2197 return true;
2198 else if (RequireNonAbstractType(Loc, AllocType,
2199 diag::err_allocation_of_abstract_type))
2200 return true;
2201 else if (AllocType->isVariablyModifiedType())
2202 return Diag(Loc, diag::err_variably_modified_new_type)
2203 << AllocType;
2204 else if (AllocType.getAddressSpace() != LangAS::Default &&
2205 !getLangOpts().OpenCLCPlusPlus)
2206 return Diag(Loc, diag::err_address_space_qualified_new)
2207 << AllocType.getUnqualifiedType()
2208 << AllocType.getQualifiers().getAddressSpaceAttributePrintValue();
2209 else if (getLangOpts().ObjCAutoRefCount) {
2210 if (const ArrayType *AT = Context.getAsArrayType(AllocType)) {
2211 QualType BaseAllocType = Context.getBaseElementType(AT);
2212 if (BaseAllocType.getObjCLifetime() == Qualifiers::OCL_None &&
2213 BaseAllocType->isObjCLifetimeType())
2214 return Diag(Loc, diag::err_arc_new_array_without_ownership)
2215 << BaseAllocType;
2216 }
2217 }
2218
2219 return false;
2220}
2221
2222static bool resolveAllocationOverload(
2223 Sema &S, LookupResult &R, SourceRange Range, SmallVectorImpl<Expr *> &Args,
2224 bool &PassAlignment, FunctionDecl *&Operator,
2225 OverloadCandidateSet *AlignedCandidates, Expr *AlignArg, bool Diagnose) {
2226 OverloadCandidateSet Candidates(R.getNameLoc(),
2227 OverloadCandidateSet::CSK_Normal);
2228 for (LookupResult::iterator Alloc = R.begin(), AllocEnd = R.end();
2229 Alloc != AllocEnd; ++Alloc) {
2230 // Even member operator new/delete are implicitly treated as
2231 // static, so don't use AddMemberCandidate.
2232 NamedDecl *D = (*Alloc)->getUnderlyingDecl();
2233
2234 if (FunctionTemplateDecl *FnTemplate = dyn_cast<FunctionTemplateDecl>(D)) {
2235 S.AddTemplateOverloadCandidate(FnTemplate, Alloc.getPair(),
2236 /*ExplicitTemplateArgs=*/nullptr, Args,
2237 Candidates,
2238 /*SuppressUserConversions=*/false);
2239 continue;
2240 }
2241
2242 FunctionDecl *Fn = cast<FunctionDecl>(D);
2243 S.AddOverloadCandidate(Fn, Alloc.getPair(), Args, Candidates,
2244 /*SuppressUserConversions=*/false);
2245 }
2246
2247 // Do the resolution.
2248 OverloadCandidateSet::iterator Best;
2249 switch (Candidates.BestViableFunction(S, R.getNameLoc(), Best)) {
2250 case OR_Success: {
2251 // Got one!
2252 FunctionDecl *FnDecl = Best->Function;
2253 if (S.CheckAllocationAccess(R.getNameLoc(), Range, R.getNamingClass(),
2254 Best->FoundDecl) == Sema::AR_inaccessible)
2255 return true;
2256
2257 Operator = FnDecl;
2258 return false;
2259 }
2260
2261 case OR_No_Viable_Function:
2262 // C++17 [expr.new]p13:
2263 // If no matching function is found and the allocated object type has
2264 // new-extended alignment, the alignment argument is removed from the
2265 // argument list, and overload resolution is performed again.
2266 if (PassAlignment) {
2267 PassAlignment = false;
2268 AlignArg = Args[1];
2269 Args.erase(Args.begin() + 1);
2270 return resolveAllocationOverload(S, R, Range, Args, PassAlignment,
2271 Operator, &Candidates, AlignArg,
2272 Diagnose);
2273 }
2274
2275 // MSVC will fall back on trying to find a matching global operator new
2276 // if operator new[] cannot be found. Also, MSVC will leak by not
2277 // generating a call to operator delete or operator delete[], but we
2278 // will not replicate that bug.
2279 // FIXME: Find out how this interacts with the std::align_val_t fallback
2280 // once MSVC implements it.
2281 if (R.getLookupName().getCXXOverloadedOperator() == OO_Array_New &&
2282 S.Context.getLangOpts().MSVCCompat) {
2283 R.clear();
2284 R.setLookupName(S.Context.DeclarationNames.getCXXOperatorName(OO_New));
2285 S.LookupQualifiedName(R, S.Context.getTranslationUnitDecl());
2286 // FIXME: This will give bad diagnostics pointing at the wrong functions.
2287 return resolveAllocationOverload(S, R, Range, Args, PassAlignment,
2288 Operator, /*Candidates=*/nullptr,
2289 /*AlignArg=*/nullptr, Diagnose);
2290 }
2291
2292 if (Diagnose) {
2293 PartialDiagnosticAt PD(R.getNameLoc(), S.PDiag(diag::err_ovl_no_viable_function_in_call)
2294 << R.getLookupName() << Range);
2295
2296 // If we have aligned candidates, only note the align_val_t candidates
2297 // from AlignedCandidates and the non-align_val_t candidates from
2298 // Candidates.
2299 if (AlignedCandidates) {
2300 auto IsAligned = [](OverloadCandidate &C) {
2301 return C.Function->getNumParams() > 1 &&
2302 C.Function->getParamDecl(1)->getType()->isAlignValT();
2303 };
2304 auto IsUnaligned = [&](OverloadCandidate &C) { return !IsAligned(C); };
2305
2306 // This was an overaligned allocation, so list the aligned candidates
2307 // first.
2308 Args.insert(Args.begin() + 1, AlignArg);
2309 AlignedCandidates->NoteCandidates(PD, S, OCD_AllCandidates, Args, "",
2310 R.getNameLoc(), IsAligned);
2311 Args.erase(Args.begin() + 1);
2312 Candidates.NoteCandidates(PD, S, OCD_AllCandidates, Args, "", R.getNameLoc(),
2313 IsUnaligned);
2314 } else {
2315 Candidates.NoteCandidates(PD, S, OCD_AllCandidates, Args);
2316 }
2317 }
2318 return true;
2319
2320 case OR_Ambiguous:
2321 if (Diagnose) {
2322 Candidates.NoteCandidates(
2323 PartialDiagnosticAt(R.getNameLoc(),
2324 S.PDiag(diag::err_ovl_ambiguous_call)
2325 << R.getLookupName() << Range),
2326 S, OCD_AmbiguousCandidates, Args);
2327 }
2328 return true;
2329
2330 case OR_Deleted: {
2331 if (Diagnose) {
2332 Candidates.NoteCandidates(
2333 PartialDiagnosticAt(R.getNameLoc(),
2334 S.PDiag(diag::err_ovl_deleted_call)
2335 << R.getLookupName() << Range),
2336 S, OCD_AllCandidates, Args);
2337 }
2338 return true;
2339 }
2340 }
2341 llvm_unreachable("Unreachable, bad result from BestViableFunction")::llvm::llvm_unreachable_internal("Unreachable, bad result from BestViableFunction"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 2341)
;
2342}
2343
2344bool Sema::FindAllocationFunctions(SourceLocation StartLoc, SourceRange Range,
2345 AllocationFunctionScope NewScope,
2346 AllocationFunctionScope DeleteScope,
2347 QualType AllocType, bool IsArray,
2348 bool &PassAlignment, MultiExprArg PlaceArgs,
2349 FunctionDecl *&OperatorNew,
2350 FunctionDecl *&OperatorDelete,
2351 bool Diagnose) {
2352 // --- Choosing an allocation function ---
2353 // C++ 5.3.4p8 - 14 & 18
2354 // 1) If looking in AFS_Global scope for allocation functions, only look in
2355 // the global scope. Else, if AFS_Class, only look in the scope of the
2356 // allocated class. If AFS_Both, look in both.
2357 // 2) If an array size is given, look for operator new[], else look for
2358 // operator new.
2359 // 3) The first argument is always size_t. Append the arguments from the
2360 // placement form.
2361
2362 SmallVector<Expr*, 8> AllocArgs;
2363 AllocArgs.reserve((PassAlignment ? 2 : 1) + PlaceArgs.size());
2364
2365 // We don't care about the actual value of these arguments.
2366 // FIXME: Should the Sema create the expression and embed it in the syntax
2367 // tree? Or should the consumer just recalculate the value?
2368 // FIXME: Using a dummy value will interact poorly with attribute enable_if.
2369 IntegerLiteral Size(Context, llvm::APInt::getNullValue(
2370 Context.getTargetInfo().getPointerWidth(0)),
2371 Context.getSizeType(),
2372 SourceLocation());
2373 AllocArgs.push_back(&Size);
2374
2375 QualType AlignValT = Context.VoidTy;
2376 if (PassAlignment) {
2377 DeclareGlobalNewDelete();
2378 AlignValT = Context.getTypeDeclType(getStdAlignValT());
2379 }
2380 CXXScalarValueInitExpr Align(AlignValT, nullptr, SourceLocation());
2381 if (PassAlignment)
2382 AllocArgs.push_back(&Align);
2383
2384 AllocArgs.insert(AllocArgs.end(), PlaceArgs.begin(), PlaceArgs.end());
2385
2386 // C++ [expr.new]p8:
2387 // If the allocated type is a non-array type, the allocation
2388 // function's name is operator new and the deallocation function's
2389 // name is operator delete. If the allocated type is an array
2390 // type, the allocation function's name is operator new[] and the
2391 // deallocation function's name is operator delete[].
2392 DeclarationName NewName = Context.DeclarationNames.getCXXOperatorName(
2393 IsArray ? OO_Array_New : OO_New);
2394
2395 QualType AllocElemType = Context.getBaseElementType(AllocType);
2396
2397 // Find the allocation function.
2398 {
2399 LookupResult R(*this, NewName, StartLoc, LookupOrdinaryName);
2400
2401 // C++1z [expr.new]p9:
2402 // If the new-expression begins with a unary :: operator, the allocation
2403 // function's name is looked up in the global scope. Otherwise, if the
2404 // allocated type is a class type T or array thereof, the allocation
2405 // function's name is looked up in the scope of T.
2406 if (AllocElemType->isRecordType() && NewScope != AFS_Global)
2407 LookupQualifiedName(R, AllocElemType->getAsCXXRecordDecl());
2408
2409 // We can see ambiguity here if the allocation function is found in
2410 // multiple base classes.
2411 if (R.isAmbiguous())
2412 return true;
2413
2414 // If this lookup fails to find the name, or if the allocated type is not
2415 // a class type, the allocation function's name is looked up in the
2416 // global scope.
2417 if (R.empty()) {
2418 if (NewScope == AFS_Class)
2419 return true;
2420
2421 LookupQualifiedName(R, Context.getTranslationUnitDecl());
2422 }
2423
2424 if (getLangOpts().OpenCLCPlusPlus && R.empty()) {
2425 if (PlaceArgs.empty()) {
2426 Diag(StartLoc, diag::err_openclcxx_not_supported) << "default new";
2427 } else {
2428 Diag(StartLoc, diag::err_openclcxx_placement_new);
2429 }
2430 return true;
2431 }
2432
2433 assert(!R.empty() && "implicitly declared allocation functions not found")((!R.empty() && "implicitly declared allocation functions not found"
) ? static_cast<void> (0) : __assert_fail ("!R.empty() && \"implicitly declared allocation functions not found\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 2433, __PRETTY_FUNCTION__))
;
2434 assert(!R.isAmbiguous() && "global allocation functions are ambiguous")((!R.isAmbiguous() && "global allocation functions are ambiguous"
) ? static_cast<void> (0) : __assert_fail ("!R.isAmbiguous() && \"global allocation functions are ambiguous\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 2434, __PRETTY_FUNCTION__))
;
2435
2436 // We do our own custom access checks below.
2437 R.suppressDiagnostics();
2438
2439 if (resolveAllocationOverload(*this, R, Range, AllocArgs, PassAlignment,
2440 OperatorNew, /*Candidates=*/nullptr,
2441 /*AlignArg=*/nullptr, Diagnose))
2442 return true;
2443 }
2444
2445 // We don't need an operator delete if we're running under -fno-exceptions.
2446 if (!getLangOpts().Exceptions) {
2447 OperatorDelete = nullptr;
2448 return false;
2449 }
2450
2451 // Note, the name of OperatorNew might have been changed from array to
2452 // non-array by resolveAllocationOverload.
2453 DeclarationName DeleteName = Context.DeclarationNames.getCXXOperatorName(
2454 OperatorNew->getDeclName().getCXXOverloadedOperator() == OO_Array_New
2455 ? OO_Array_Delete
2456 : OO_Delete);
2457
2458 // C++ [expr.new]p19:
2459 //
2460 // If the new-expression begins with a unary :: operator, the
2461 // deallocation function's name is looked up in the global
2462 // scope. Otherwise, if the allocated type is a class type T or an
2463 // array thereof, the deallocation function's name is looked up in
2464 // the scope of T. If this lookup fails to find the name, or if
2465 // the allocated type is not a class type or array thereof, the
2466 // deallocation function's name is looked up in the global scope.
2467 LookupResult FoundDelete(*this, DeleteName, StartLoc, LookupOrdinaryName);
2468 if (AllocElemType->isRecordType() && DeleteScope != AFS_Global) {
2469 auto *RD =
2470 cast<CXXRecordDecl>(AllocElemType->castAs<RecordType>()->getDecl());
2471 LookupQualifiedName(FoundDelete, RD);
2472 }
2473 if (FoundDelete.isAmbiguous())
2474 return true; // FIXME: clean up expressions?
2475
2476 bool FoundGlobalDelete = FoundDelete.empty();
2477 if (FoundDelete.empty()) {
2478 if (DeleteScope == AFS_Class)
2479 return true;
2480
2481 DeclareGlobalNewDelete();
2482 LookupQualifiedName(FoundDelete, Context.getTranslationUnitDecl());
2483 }
2484
2485 FoundDelete.suppressDiagnostics();
2486
2487 SmallVector<std::pair<DeclAccessPair,FunctionDecl*>, 2> Matches;
2488
2489 // Whether we're looking for a placement operator delete is dictated
2490 // by whether we selected a placement operator new, not by whether
2491 // we had explicit placement arguments. This matters for things like
2492 // struct A { void *operator new(size_t, int = 0); ... };
2493 // A *a = new A()
2494 //
2495 // We don't have any definition for what a "placement allocation function"
2496 // is, but we assume it's any allocation function whose
2497 // parameter-declaration-clause is anything other than (size_t).
2498 //
2499 // FIXME: Should (size_t, std::align_val_t) also be considered non-placement?
2500 // This affects whether an exception from the constructor of an overaligned
2501 // type uses the sized or non-sized form of aligned operator delete.
2502 bool isPlacementNew = !PlaceArgs.empty() || OperatorNew->param_size() != 1 ||
2503 OperatorNew->isVariadic();
2504
2505 if (isPlacementNew) {
2506 // C++ [expr.new]p20:
2507 // A declaration of a placement deallocation function matches the
2508 // declaration of a placement allocation function if it has the
2509 // same number of parameters and, after parameter transformations
2510 // (8.3.5), all parameter types except the first are
2511 // identical. [...]
2512 //
2513 // To perform this comparison, we compute the function type that
2514 // the deallocation function should have, and use that type both
2515 // for template argument deduction and for comparison purposes.
2516 QualType ExpectedFunctionType;
2517 {
2518 const FunctionProtoType *Proto
2519 = OperatorNew->getType()->getAs<FunctionProtoType>();
2520
2521 SmallVector<QualType, 4> ArgTypes;
2522 ArgTypes.push_back(Context.VoidPtrTy);
2523 for (unsigned I = 1, N = Proto->getNumParams(); I < N; ++I)
2524 ArgTypes.push_back(Proto->getParamType(I));
2525
2526 FunctionProtoType::ExtProtoInfo EPI;
2527 // FIXME: This is not part of the standard's rule.
2528 EPI.Variadic = Proto->isVariadic();
2529
2530 ExpectedFunctionType
2531 = Context.getFunctionType(Context.VoidTy, ArgTypes, EPI);
2532 }
2533
2534 for (LookupResult::iterator D = FoundDelete.begin(),
2535 DEnd = FoundDelete.end();
2536 D != DEnd; ++D) {
2537 FunctionDecl *Fn = nullptr;
2538 if (FunctionTemplateDecl *FnTmpl =
2539 dyn_cast<FunctionTemplateDecl>((*D)->getUnderlyingDecl())) {
2540 // Perform template argument deduction to try to match the
2541 // expected function type.
2542 TemplateDeductionInfo Info(StartLoc);
2543 if (DeduceTemplateArguments(FnTmpl, nullptr, ExpectedFunctionType, Fn,
2544 Info))
2545 continue;
2546 } else
2547 Fn = cast<FunctionDecl>((*D)->getUnderlyingDecl());
2548
2549 if (Context.hasSameType(adjustCCAndNoReturn(Fn->getType(),
2550 ExpectedFunctionType,
2551 /*AdjustExcpetionSpec*/true),
2552 ExpectedFunctionType))
2553 Matches.push_back(std::make_pair(D.getPair(), Fn));
2554 }
2555
2556 if (getLangOpts().CUDA)
2557 EraseUnwantedCUDAMatches(dyn_cast<FunctionDecl>(CurContext), Matches);
2558 } else {
2559 // C++1y [expr.new]p22:
2560 // For a non-placement allocation function, the normal deallocation
2561 // function lookup is used
2562 //
2563 // Per [expr.delete]p10, this lookup prefers a member operator delete
2564 // without a size_t argument, but prefers a non-member operator delete
2565 // with a size_t where possible (which it always is in this case).
2566 llvm::SmallVector<UsualDeallocFnInfo, 4> BestDeallocFns;
2567 UsualDeallocFnInfo Selected = resolveDeallocationOverload(
2568 *this, FoundDelete, /*WantSize*/ FoundGlobalDelete,
2569 /*WantAlign*/ hasNewExtendedAlignment(*this, AllocElemType),
2570 &BestDeallocFns);
2571 if (Selected)
2572 Matches.push_back(std::make_pair(Selected.Found, Selected.FD));
2573 else {
2574 // If we failed to select an operator, all remaining functions are viable
2575 // but ambiguous.
2576 for (auto Fn : BestDeallocFns)
2577 Matches.push_back(std::make_pair(Fn.Found, Fn.FD));
2578 }
2579 }
2580
2581 // C++ [expr.new]p20:
2582 // [...] If the lookup finds a single matching deallocation
2583 // function, that function will be called; otherwise, no
2584 // deallocation function will be called.
2585 if (Matches.size() == 1) {
2586 OperatorDelete = Matches[0].second;
2587
2588 // C++1z [expr.new]p23:
2589 // If the lookup finds a usual deallocation function (3.7.4.2)
2590 // with a parameter of type std::size_t and that function, considered
2591 // as a placement deallocation function, would have been
2592 // selected as a match for the allocation function, the program
2593 // is ill-formed.
2594 if (getLangOpts().CPlusPlus11 && isPlacementNew &&
2595 isNonPlacementDeallocationFunction(*this, OperatorDelete)) {
2596 UsualDeallocFnInfo Info(*this,
2597 DeclAccessPair::make(OperatorDelete, AS_public));
2598 // Core issue, per mail to core reflector, 2016-10-09:
2599 // If this is a member operator delete, and there is a corresponding
2600 // non-sized member operator delete, this isn't /really/ a sized
2601 // deallocation function, it just happens to have a size_t parameter.
2602 bool IsSizedDelete = Info.HasSizeT;
2603 if (IsSizedDelete && !FoundGlobalDelete) {
2604 auto NonSizedDelete =
2605 resolveDeallocationOverload(*this, FoundDelete, /*WantSize*/false,
2606 /*WantAlign*/Info.HasAlignValT);
2607 if (NonSizedDelete && !NonSizedDelete.HasSizeT &&
2608 NonSizedDelete.HasAlignValT == Info.HasAlignValT)
2609 IsSizedDelete = false;
2610 }
2611
2612 if (IsSizedDelete) {
2613 SourceRange R = PlaceArgs.empty()
2614 ? SourceRange()
2615 : SourceRange(PlaceArgs.front()->getBeginLoc(),
2616 PlaceArgs.back()->getEndLoc());
2617 Diag(StartLoc, diag::err_placement_new_non_placement_delete) << R;
2618 if (!OperatorDelete->isImplicit())
2619 Diag(OperatorDelete->getLocation(), diag::note_previous_decl)
2620 << DeleteName;
2621 }
2622 }
2623
2624 CheckAllocationAccess(StartLoc, Range, FoundDelete.getNamingClass(),
2625 Matches[0].first);
2626 } else if (!Matches.empty()) {
2627 // We found multiple suitable operators. Per [expr.new]p20, that means we
2628 // call no 'operator delete' function, but we should at least warn the user.
2629 // FIXME: Suppress this warning if the construction cannot throw.
2630 Diag(StartLoc, diag::warn_ambiguous_suitable_delete_function_found)
2631 << DeleteName << AllocElemType;
2632
2633 for (auto &Match : Matches)
2634 Diag(Match.second->getLocation(),
2635 diag::note_member_declared_here) << DeleteName;
2636 }
2637
2638 return false;
2639}
2640
2641/// DeclareGlobalNewDelete - Declare the global forms of operator new and
2642/// delete. These are:
2643/// @code
2644/// // C++03:
2645/// void* operator new(std::size_t) throw(std::bad_alloc);
2646/// void* operator new[](std::size_t) throw(std::bad_alloc);
2647/// void operator delete(void *) throw();
2648/// void operator delete[](void *) throw();
2649/// // C++11:
2650/// void* operator new(std::size_t);
2651/// void* operator new[](std::size_t);
2652/// void operator delete(void *) noexcept;
2653/// void operator delete[](void *) noexcept;
2654/// // C++1y:
2655/// void* operator new(std::size_t);
2656/// void* operator new[](std::size_t);
2657/// void operator delete(void *) noexcept;
2658/// void operator delete[](void *) noexcept;
2659/// void operator delete(void *, std::size_t) noexcept;
2660/// void operator delete[](void *, std::size_t) noexcept;
2661/// @endcode
2662/// Note that the placement and nothrow forms of new are *not* implicitly
2663/// declared. Their use requires including \<new\>.
2664void Sema::DeclareGlobalNewDelete() {
2665 if (GlobalNewDeleteDeclared)
2666 return;
2667
2668 // The implicitly declared new and delete operators
2669 // are not supported in OpenCL.
2670 if (getLangOpts().OpenCLCPlusPlus)
2671 return;
2672
2673 // C++ [basic.std.dynamic]p2:
2674 // [...] The following allocation and deallocation functions (18.4) are
2675 // implicitly declared in global scope in each translation unit of a
2676 // program
2677 //
2678 // C++03:
2679 // void* operator new(std::size_t) throw(std::bad_alloc);
2680 // void* operator new[](std::size_t) throw(std::bad_alloc);
2681 // void operator delete(void*) throw();
2682 // void operator delete[](void*) throw();
2683 // C++11:
2684 // void* operator new(std::size_t);
2685 // void* operator new[](std::size_t);
2686 // void operator delete(void*) noexcept;
2687 // void operator delete[](void*) noexcept;
2688 // C++1y:
2689 // void* operator new(std::size_t);
2690 // void* operator new[](std::size_t);
2691 // void operator delete(void*) noexcept;
2692 // void operator delete[](void*) noexcept;
2693 // void operator delete(void*, std::size_t) noexcept;
2694 // void operator delete[](void*, std::size_t) noexcept;
2695 //
2696 // These implicit declarations introduce only the function names operator
2697 // new, operator new[], operator delete, operator delete[].
2698 //
2699 // Here, we need to refer to std::bad_alloc, so we will implicitly declare
2700 // "std" or "bad_alloc" as necessary to form the exception specification.
2701 // However, we do not make these implicit declarations visible to name
2702 // lookup.
2703 if (!StdBadAlloc && !getLangOpts().CPlusPlus11) {
2704 // The "std::bad_alloc" class has not yet been declared, so build it
2705 // implicitly.
2706 StdBadAlloc = CXXRecordDecl::Create(Context, TTK_Class,
2707 getOrCreateStdNamespace(),
2708 SourceLocation(), SourceLocation(),
2709 &PP.getIdentifierTable().get("bad_alloc"),
2710 nullptr);
2711 getStdBadAlloc()->setImplicit(true);
2712 }
2713 if (!StdAlignValT && getLangOpts().AlignedAllocation) {
2714 // The "std::align_val_t" enum class has not yet been declared, so build it
2715 // implicitly.
2716 auto *AlignValT = EnumDecl::Create(
2717 Context, getOrCreateStdNamespace(), SourceLocation(), SourceLocation(),
2718 &PP.getIdentifierTable().get("align_val_t"), nullptr, true, true, true);
2719 AlignValT->setIntegerType(Context.getSizeType());
2720 AlignValT->setPromotionType(Context.getSizeType());
2721 AlignValT->setImplicit(true);
2722 StdAlignValT = AlignValT;
2723 }
2724
2725 GlobalNewDeleteDeclared = true;
2726
2727 QualType VoidPtr = Context.getPointerType(Context.VoidTy);
2728 QualType SizeT = Context.getSizeType();
2729
2730 auto DeclareGlobalAllocationFunctions = [&](OverloadedOperatorKind Kind,
2731 QualType Return, QualType Param) {
2732 llvm::SmallVector<QualType, 3> Params;
2733 Params.push_back(Param);
2734
2735 // Create up to four variants of the function (sized/aligned).
2736 bool HasSizedVariant = getLangOpts().SizedDeallocation &&
2737 (Kind == OO_Delete || Kind == OO_Array_Delete);
2738 bool HasAlignedVariant = getLangOpts().AlignedAllocation;
2739
2740 int NumSizeVariants = (HasSizedVariant ? 2 : 1);
2741 int NumAlignVariants = (HasAlignedVariant ? 2 : 1);
2742 for (int Sized = 0; Sized < NumSizeVariants; ++Sized) {
2743 if (Sized)
2744 Params.push_back(SizeT);
2745
2746 for (int Aligned = 0; Aligned < NumAlignVariants; ++Aligned) {
2747 if (Aligned)
2748 Params.push_back(Context.getTypeDeclType(getStdAlignValT()));
2749
2750 DeclareGlobalAllocationFunction(
2751 Context.DeclarationNames.getCXXOperatorName(Kind), Return, Params);
2752
2753 if (Aligned)
2754 Params.pop_back();
2755 }
2756 }
2757 };
2758
2759 DeclareGlobalAllocationFunctions(OO_New, VoidPtr, SizeT);
2760 DeclareGlobalAllocationFunctions(OO_Array_New, VoidPtr, SizeT);
2761 DeclareGlobalAllocationFunctions(OO_Delete, Context.VoidTy, VoidPtr);
2762 DeclareGlobalAllocationFunctions(OO_Array_Delete, Context.VoidTy, VoidPtr);
2763}
2764
2765/// DeclareGlobalAllocationFunction - Declares a single implicit global
2766/// allocation function if it doesn't already exist.
2767void Sema::DeclareGlobalAllocationFunction(DeclarationName Name,
2768 QualType Return,
2769 ArrayRef<QualType> Params) {
2770 DeclContext *GlobalCtx = Context.getTranslationUnitDecl();
2771
2772 // Check if this function is already declared.
2773 DeclContext::lookup_result R = GlobalCtx->lookup(Name);
2774 for (DeclContext::lookup_iterator Alloc = R.begin(), AllocEnd = R.end();
2775 Alloc != AllocEnd; ++Alloc) {
2776 // Only look at non-template functions, as it is the predefined,
2777 // non-templated allocation function we are trying to declare here.
2778 if (FunctionDecl *Func = dyn_cast<FunctionDecl>(*Alloc)) {
2779 if (Func->getNumParams() == Params.size()) {
2780 llvm::SmallVector<QualType, 3> FuncParams;
2781 for (auto *P : Func->parameters())
2782 FuncParams.push_back(
2783 Context.getCanonicalType(P->getType().getUnqualifiedType()));
2784 if (llvm::makeArrayRef(FuncParams) == Params) {
2785 // Make the function visible to name lookup, even if we found it in
2786 // an unimported module. It either is an implicitly-declared global
2787 // allocation function, or is suppressing that function.
2788 Func->setVisibleDespiteOwningModule();
2789 return;
2790 }
2791 }
2792 }
2793 }
2794
2795 FunctionProtoType::ExtProtoInfo EPI(Context.getDefaultCallingConvention(
2796 /*IsVariadic=*/false, /*IsCXXMethod=*/false, /*IsBuiltin=*/true));
2797
2798 QualType BadAllocType;
2799 bool HasBadAllocExceptionSpec
2800 = (Name.getCXXOverloadedOperator() == OO_New ||
2801 Name.getCXXOverloadedOperator() == OO_Array_New);
2802 if (HasBadAllocExceptionSpec) {
2803 if (!getLangOpts().CPlusPlus11) {
2804 BadAllocType = Context.getTypeDeclType(getStdBadAlloc());
2805 assert(StdBadAlloc && "Must have std::bad_alloc declared")((StdBadAlloc && "Must have std::bad_alloc declared")
? static_cast<void> (0) : __assert_fail ("StdBadAlloc && \"Must have std::bad_alloc declared\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 2805, __PRETTY_FUNCTION__))
;
2806 EPI.ExceptionSpec.Type = EST_Dynamic;
2807 EPI.ExceptionSpec.Exceptions = llvm::makeArrayRef(BadAllocType);
2808 }
2809 } else {
2810 EPI.ExceptionSpec =
2811 getLangOpts().CPlusPlus11 ? EST_BasicNoexcept : EST_DynamicNone;
2812 }
2813
2814 auto CreateAllocationFunctionDecl = [&](Attr *ExtraAttr) {
2815 QualType FnType = Context.getFunctionType(Return, Params, EPI);
2816 FunctionDecl *Alloc = FunctionDecl::Create(
2817 Context, GlobalCtx, SourceLocation(), SourceLocation(), Name,
2818 FnType, /*TInfo=*/nullptr, SC_None, false, true);
2819 Alloc->setImplicit();
2820 // Global allocation functions should always be visible.
2821 Alloc->setVisibleDespiteOwningModule();
2822
2823 Alloc->addAttr(VisibilityAttr::CreateImplicit(
2824 Context, LangOpts.GlobalAllocationFunctionVisibilityHidden
2825 ? VisibilityAttr::Hidden
2826 : VisibilityAttr::Default));
2827
2828 llvm::SmallVector<ParmVarDecl *, 3> ParamDecls;
2829 for (QualType T : Params) {
2830 ParamDecls.push_back(ParmVarDecl::Create(
2831 Context, Alloc, SourceLocation(), SourceLocation(), nullptr, T,
2832 /*TInfo=*/nullptr, SC_None, nullptr));
2833 ParamDecls.back()->setImplicit();
2834 }
2835 Alloc->setParams(ParamDecls);
2836 if (ExtraAttr)
2837 Alloc->addAttr(ExtraAttr);
2838 Context.getTranslationUnitDecl()->addDecl(Alloc);
2839 IdResolver.tryAddTopLevelDecl(Alloc, Name);
2840 };
2841
2842 if (!LangOpts.CUDA)
2843 CreateAllocationFunctionDecl(nullptr);
2844 else {
2845 // Host and device get their own declaration so each can be
2846 // defined or re-declared independently.
2847 CreateAllocationFunctionDecl(CUDAHostAttr::CreateImplicit(Context));
2848 CreateAllocationFunctionDecl(CUDADeviceAttr::CreateImplicit(Context));
2849 }
2850}
2851
2852FunctionDecl *Sema::FindUsualDeallocationFunction(SourceLocation StartLoc,
2853 bool CanProvideSize,
2854 bool Overaligned,
2855 DeclarationName Name) {
2856 DeclareGlobalNewDelete();
2857
2858 LookupResult FoundDelete(*this, Name, StartLoc, LookupOrdinaryName);
2859 LookupQualifiedName(FoundDelete, Context.getTranslationUnitDecl());
2860
2861 // FIXME: It's possible for this to result in ambiguity, through a
2862 // user-declared variadic operator delete or the enable_if attribute. We
2863 // should probably not consider those cases to be usual deallocation
2864 // functions. But for now we just make an arbitrary choice in that case.
2865 auto Result = resolveDeallocationOverload(*this, FoundDelete, CanProvideSize,
2866 Overaligned);
2867 assert(Result.FD && "operator delete missing from global scope?")((Result.FD && "operator delete missing from global scope?"
) ? static_cast<void> (0) : __assert_fail ("Result.FD && \"operator delete missing from global scope?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 2867, __PRETTY_FUNCTION__))
;
2868 return Result.FD;
2869}
2870
2871FunctionDecl *Sema::FindDeallocationFunctionForDestructor(SourceLocation Loc,
2872 CXXRecordDecl *RD) {
2873 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Delete);
2874
2875 FunctionDecl *OperatorDelete = nullptr;
2876 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete))
2877 return nullptr;
2878 if (OperatorDelete)
2879 return OperatorDelete;
2880
2881 // If there's no class-specific operator delete, look up the global
2882 // non-array delete.
2883 return FindUsualDeallocationFunction(
2884 Loc, true, hasNewExtendedAlignment(*this, Context.getRecordType(RD)),
2885 Name);
2886}
2887
2888bool Sema::FindDeallocationFunction(SourceLocation StartLoc, CXXRecordDecl *RD,
2889 DeclarationName Name,
2890 FunctionDecl *&Operator, bool Diagnose) {
2891 LookupResult Found(*this, Name, StartLoc, LookupOrdinaryName);
2892 // Try to find operator delete/operator delete[] in class scope.
2893 LookupQualifiedName(Found, RD);
2894
2895 if (Found.isAmbiguous())
2896 return true;
2897
2898 Found.suppressDiagnostics();
2899
2900 bool Overaligned = hasNewExtendedAlignment(*this, Context.getRecordType(RD));
2901
2902 // C++17 [expr.delete]p10:
2903 // If the deallocation functions have class scope, the one without a
2904 // parameter of type std::size_t is selected.
2905 llvm::SmallVector<UsualDeallocFnInfo, 4> Matches;
2906 resolveDeallocationOverload(*this, Found, /*WantSize*/ false,
2907 /*WantAlign*/ Overaligned, &Matches);
2908
2909 // If we could find an overload, use it.
2910 if (Matches.size() == 1) {
2911 Operator = cast<CXXMethodDecl>(Matches[0].FD);
2912
2913 // FIXME: DiagnoseUseOfDecl?
2914 if (Operator->isDeleted()) {
2915 if (Diagnose) {
2916 Diag(StartLoc, diag::err_deleted_function_use);
2917 NoteDeletedFunction(Operator);
2918 }
2919 return true;
2920 }
2921
2922 if (CheckAllocationAccess(StartLoc, SourceRange(), Found.getNamingClass(),
2923 Matches[0].Found, Diagnose) == AR_inaccessible)
2924 return true;
2925
2926 return false;
2927 }
2928
2929 // We found multiple suitable operators; complain about the ambiguity.
2930 // FIXME: The standard doesn't say to do this; it appears that the intent
2931 // is that this should never happen.
2932 if (!Matches.empty()) {
2933 if (Diagnose) {
2934 Diag(StartLoc, diag::err_ambiguous_suitable_delete_member_function_found)
2935 << Name << RD;
2936 for (auto &Match : Matches)
2937 Diag(Match.FD->getLocation(), diag::note_member_declared_here) << Name;
2938 }
2939 return true;
2940 }
2941
2942 // We did find operator delete/operator delete[] declarations, but
2943 // none of them were suitable.
2944 if (!Found.empty()) {
2945 if (Diagnose) {
2946 Diag(StartLoc, diag::err_no_suitable_delete_member_function_found)
2947 << Name << RD;
2948
2949 for (NamedDecl *D : Found)
2950 Diag(D->getUnderlyingDecl()->getLocation(),
2951 diag::note_member_declared_here) << Name;
2952 }
2953 return true;
2954 }
2955
2956 Operator = nullptr;
2957 return false;
2958}
2959
2960namespace {
2961/// Checks whether delete-expression, and new-expression used for
2962/// initializing deletee have the same array form.
2963class MismatchingNewDeleteDetector {
2964public:
2965 enum MismatchResult {
2966 /// Indicates that there is no mismatch or a mismatch cannot be proven.
2967 NoMismatch,
2968 /// Indicates that variable is initialized with mismatching form of \a new.
2969 VarInitMismatches,
2970 /// Indicates that member is initialized with mismatching form of \a new.
2971 MemberInitMismatches,
2972 /// Indicates that 1 or more constructors' definitions could not been
2973 /// analyzed, and they will be checked again at the end of translation unit.
2974 AnalyzeLater
2975 };
2976
2977 /// \param EndOfTU True, if this is the final analysis at the end of
2978 /// translation unit. False, if this is the initial analysis at the point
2979 /// delete-expression was encountered.
2980 explicit MismatchingNewDeleteDetector(bool EndOfTU)
2981 : Field(nullptr), IsArrayForm(false), EndOfTU(EndOfTU),
2982 HasUndefinedConstructors(false) {}
2983
2984 /// Checks whether pointee of a delete-expression is initialized with
2985 /// matching form of new-expression.
2986 ///
2987 /// If return value is \c VarInitMismatches or \c MemberInitMismatches at the
2988 /// point where delete-expression is encountered, then a warning will be
2989 /// issued immediately. If return value is \c AnalyzeLater at the point where
2990 /// delete-expression is seen, then member will be analyzed at the end of
2991 /// translation unit. \c AnalyzeLater is returned iff at least one constructor
2992 /// couldn't be analyzed. If at least one constructor initializes the member
2993 /// with matching type of new, the return value is \c NoMismatch.
2994 MismatchResult analyzeDeleteExpr(const CXXDeleteExpr *DE);
2995 /// Analyzes a class member.
2996 /// \param Field Class member to analyze.
2997 /// \param DeleteWasArrayForm Array form-ness of the delete-expression used
2998 /// for deleting the \p Field.
2999 MismatchResult analyzeField(FieldDecl *Field, bool DeleteWasArrayForm);
3000 FieldDecl *Field;
3001 /// List of mismatching new-expressions used for initialization of the pointee
3002 llvm::SmallVector<const CXXNewExpr *, 4> NewExprs;
3003 /// Indicates whether delete-expression was in array form.
3004 bool IsArrayForm;
3005
3006private:
3007 const bool EndOfTU;
3008 /// Indicates that there is at least one constructor without body.
3009 bool HasUndefinedConstructors;
3010 /// Returns \c CXXNewExpr from given initialization expression.
3011 /// \param E Expression used for initializing pointee in delete-expression.
3012 /// E can be a single-element \c InitListExpr consisting of new-expression.
3013 const CXXNewExpr *getNewExprFromInitListOrExpr(const Expr *E);
3014 /// Returns whether member is initialized with mismatching form of
3015 /// \c new either by the member initializer or in-class initialization.
3016 ///
3017 /// If bodies of all constructors are not visible at the end of translation
3018 /// unit or at least one constructor initializes member with the matching
3019 /// form of \c new, mismatch cannot be proven, and this function will return
3020 /// \c NoMismatch.
3021 MismatchResult analyzeMemberExpr(const MemberExpr *ME);
3022 /// Returns whether variable is initialized with mismatching form of
3023 /// \c new.
3024 ///
3025 /// If variable is initialized with matching form of \c new or variable is not
3026 /// initialized with a \c new expression, this function will return true.
3027 /// If variable is initialized with mismatching form of \c new, returns false.
3028 /// \param D Variable to analyze.
3029 bool hasMatchingVarInit(const DeclRefExpr *D);
3030 /// Checks whether the constructor initializes pointee with mismatching
3031 /// form of \c new.
3032 ///
3033 /// Returns true, if member is initialized with matching form of \c new in
3034 /// member initializer list. Returns false, if member is initialized with the
3035 /// matching form of \c new in this constructor's initializer or given
3036 /// constructor isn't defined at the point where delete-expression is seen, or
3037 /// member isn't initialized by the constructor.
3038 bool hasMatchingNewInCtor(const CXXConstructorDecl *CD);
3039 /// Checks whether member is initialized with matching form of
3040 /// \c new in member initializer list.
3041 bool hasMatchingNewInCtorInit(const CXXCtorInitializer *CI);
3042 /// Checks whether member is initialized with mismatching form of \c new by
3043 /// in-class initializer.
3044 MismatchResult analyzeInClassInitializer();
3045};
3046}
3047
3048MismatchingNewDeleteDetector::MismatchResult
3049MismatchingNewDeleteDetector::analyzeDeleteExpr(const CXXDeleteExpr *DE) {
3050 NewExprs.clear();
3051 assert(DE && "Expected delete-expression")((DE && "Expected delete-expression") ? static_cast<
void> (0) : __assert_fail ("DE && \"Expected delete-expression\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 3051, __PRETTY_FUNCTION__))
;
3052 IsArrayForm = DE->isArrayForm();
3053 const Expr *E = DE->getArgument()->IgnoreParenImpCasts();
3054 if (const MemberExpr *ME = dyn_cast<const MemberExpr>(E)) {
3055 return analyzeMemberExpr(ME);
3056 } else if (const DeclRefExpr *D = dyn_cast<const DeclRefExpr>(E)) {
3057 if (!hasMatchingVarInit(D))
3058 return VarInitMismatches;
3059 }
3060 return NoMismatch;
3061}
3062
3063const CXXNewExpr *
3064MismatchingNewDeleteDetector::getNewExprFromInitListOrExpr(const Expr *E) {
3065 assert(E != nullptr && "Expected a valid initializer expression")((E != nullptr && "Expected a valid initializer expression"
) ? static_cast<void> (0) : __assert_fail ("E != nullptr && \"Expected a valid initializer expression\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 3065, __PRETTY_FUNCTION__))
;
3066 E = E->IgnoreParenImpCasts();
3067 if (const InitListExpr *ILE = dyn_cast<const InitListExpr>(E)) {
3068 if (ILE->getNumInits() == 1)
3069 E = dyn_cast<const CXXNewExpr>(ILE->getInit(0)->IgnoreParenImpCasts());
3070 }
3071
3072 return dyn_cast_or_null<const CXXNewExpr>(E);
3073}
3074
3075bool MismatchingNewDeleteDetector::hasMatchingNewInCtorInit(
3076 const CXXCtorInitializer *CI) {
3077 const CXXNewExpr *NE = nullptr;
3078 if (Field == CI->getMember() &&
3079 (NE = getNewExprFromInitListOrExpr(CI->getInit()))) {
3080 if (NE->isArray() == IsArrayForm)
3081 return true;
3082 else
3083 NewExprs.push_back(NE);
3084 }
3085 return false;
3086}
3087
3088bool MismatchingNewDeleteDetector::hasMatchingNewInCtor(
3089 const CXXConstructorDecl *CD) {
3090 if (CD->isImplicit())
3091 return false;
3092 const FunctionDecl *Definition = CD;
3093 if (!CD->isThisDeclarationADefinition() && !CD->isDefined(Definition)) {
3094 HasUndefinedConstructors = true;
3095 return EndOfTU;
3096 }
3097 for (const auto *CI : cast<const CXXConstructorDecl>(Definition)->inits()) {
3098 if (hasMatchingNewInCtorInit(CI))
3099 return true;
3100 }
3101 return false;
3102}
3103
3104MismatchingNewDeleteDetector::MismatchResult
3105MismatchingNewDeleteDetector::analyzeInClassInitializer() {
3106 assert(Field != nullptr && "This should be called only for members")((Field != nullptr && "This should be called only for members"
) ? static_cast<void> (0) : __assert_fail ("Field != nullptr && \"This should be called only for members\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 3106, __PRETTY_FUNCTION__))
;
3107 const Expr *InitExpr = Field->getInClassInitializer();
3108 if (!InitExpr)
3109 return EndOfTU ? NoMismatch : AnalyzeLater;
3110 if (const CXXNewExpr *NE = getNewExprFromInitListOrExpr(InitExpr)) {
3111 if (NE->isArray() != IsArrayForm) {
3112 NewExprs.push_back(NE);
3113 return MemberInitMismatches;
3114 }
3115 }
3116 return NoMismatch;
3117}
3118
3119MismatchingNewDeleteDetector::MismatchResult
3120MismatchingNewDeleteDetector::analyzeField(FieldDecl *Field,
3121 bool DeleteWasArrayForm) {
3122 assert(Field != nullptr && "Analysis requires a valid class member.")((Field != nullptr && "Analysis requires a valid class member."
) ? static_cast<void> (0) : __assert_fail ("Field != nullptr && \"Analysis requires a valid class member.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 3122, __PRETTY_FUNCTION__))
;
3123 this->Field = Field;
3124 IsArrayForm = DeleteWasArrayForm;
3125 const CXXRecordDecl *RD = cast<const CXXRecordDecl>(Field->getParent());
3126 for (const auto *CD : RD->ctors()) {
3127 if (hasMatchingNewInCtor(CD))
3128 return NoMismatch;
3129 }
3130 if (HasUndefinedConstructors)
3131 return EndOfTU ? NoMismatch : AnalyzeLater;
3132 if (!NewExprs.empty())
3133 return MemberInitMismatches;
3134 return Field->hasInClassInitializer() ? analyzeInClassInitializer()
3135 : NoMismatch;
3136}
3137
3138MismatchingNewDeleteDetector::MismatchResult
3139MismatchingNewDeleteDetector::analyzeMemberExpr(const MemberExpr *ME) {
3140 assert(ME != nullptr && "Expected a member expression")((ME != nullptr && "Expected a member expression") ? static_cast
<void> (0) : __assert_fail ("ME != nullptr && \"Expected a member expression\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 3140, __PRETTY_FUNCTION__))
;
3141 if (FieldDecl *F = dyn_cast<FieldDecl>(ME->getMemberDecl()))
3142 return analyzeField(F, IsArrayForm);
3143 return NoMismatch;
3144}
3145
3146bool MismatchingNewDeleteDetector::hasMatchingVarInit(const DeclRefExpr *D) {
3147 const CXXNewExpr *NE = nullptr;
3148 if (const VarDecl *VD = dyn_cast<const VarDecl>(D->getDecl())) {
3149 if (VD->hasInit() && (NE = getNewExprFromInitListOrExpr(VD->getInit())) &&
3150 NE->isArray() != IsArrayForm) {
3151 NewExprs.push_back(NE);
3152 }
3153 }
3154 return NewExprs.empty();
3155}
3156
3157static void
3158DiagnoseMismatchedNewDelete(Sema &SemaRef, SourceLocation DeleteLoc,
3159 const MismatchingNewDeleteDetector &Detector) {
3160 SourceLocation EndOfDelete = SemaRef.getLocForEndOfToken(DeleteLoc);
3161 FixItHint H;
3162 if (!Detector.IsArrayForm)
3163 H = FixItHint::CreateInsertion(EndOfDelete, "[]");
3164 else {
3165 SourceLocation RSquare = Lexer::findLocationAfterToken(
3166 DeleteLoc, tok::l_square, SemaRef.getSourceManager(),
3167 SemaRef.getLangOpts(), true);
3168 if (RSquare.isValid())
3169 H = FixItHint::CreateRemoval(SourceRange(EndOfDelete, RSquare));
3170 }
3171 SemaRef.Diag(DeleteLoc, diag::warn_mismatched_delete_new)
3172 << Detector.IsArrayForm << H;
3173
3174 for (const auto *NE : Detector.NewExprs)
3175 SemaRef.Diag(NE->getExprLoc(), diag::note_allocated_here)
3176 << Detector.IsArrayForm;
3177}
3178
3179void Sema::AnalyzeDeleteExprMismatch(const CXXDeleteExpr *DE) {
3180 if (Diags.isIgnored(diag::warn_mismatched_delete_new, SourceLocation()))
3181 return;
3182 MismatchingNewDeleteDetector Detector(/*EndOfTU=*/false);
3183 switch (Detector.analyzeDeleteExpr(DE)) {
3184 case MismatchingNewDeleteDetector::VarInitMismatches:
3185 case MismatchingNewDeleteDetector::MemberInitMismatches: {
3186 DiagnoseMismatchedNewDelete(*this, DE->getBeginLoc(), Detector);
3187 break;
3188 }
3189 case MismatchingNewDeleteDetector::AnalyzeLater: {
3190 DeleteExprs[Detector.Field].push_back(
3191 std::make_pair(DE->getBeginLoc(), DE->isArrayForm()));
3192 break;
3193 }
3194 case MismatchingNewDeleteDetector::NoMismatch:
3195 break;
3196 }
3197}
3198
3199void Sema::AnalyzeDeleteExprMismatch(FieldDecl *Field, SourceLocation DeleteLoc,
3200 bool DeleteWasArrayForm) {
3201 MismatchingNewDeleteDetector Detector(/*EndOfTU=*/true);
3202 switch (Detector.analyzeField(Field, DeleteWasArrayForm)) {
3203 case MismatchingNewDeleteDetector::VarInitMismatches:
3204 llvm_unreachable("This analysis should have been done for class members.")::llvm::llvm_unreachable_internal("This analysis should have been done for class members."
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 3204)
;
3205 case MismatchingNewDeleteDetector::AnalyzeLater:
3206 llvm_unreachable("Analysis cannot be postponed any point beyond end of "::llvm::llvm_unreachable_internal("Analysis cannot be postponed any point beyond end of "
"translation unit.", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 3207)
3207 "translation unit.")::llvm::llvm_unreachable_internal("Analysis cannot be postponed any point beyond end of "
"translation unit.", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 3207)
;
3208 case MismatchingNewDeleteDetector::MemberInitMismatches:
3209 DiagnoseMismatchedNewDelete(*this, DeleteLoc, Detector);
3210 break;
3211 case MismatchingNewDeleteDetector::NoMismatch:
3212 break;
3213 }
3214}
3215
3216/// ActOnCXXDelete - Parsed a C++ 'delete' expression (C++ 5.3.5), as in:
3217/// @code ::delete ptr; @endcode
3218/// or
3219/// @code delete [] ptr; @endcode
3220ExprResult
3221Sema::ActOnCXXDelete(SourceLocation StartLoc, bool UseGlobal,
3222 bool ArrayForm, Expr *ExE) {
3223 // C++ [expr.delete]p1:
3224 // The operand shall have a pointer type, or a class type having a single
3225 // non-explicit conversion function to a pointer type. The result has type
3226 // void.
3227 //
3228 // DR599 amends "pointer type" to "pointer to object type" in both cases.
3229
3230 ExprResult Ex = ExE;
3231 FunctionDecl *OperatorDelete = nullptr;
3232 bool ArrayFormAsWritten = ArrayForm;
3233 bool UsualArrayDeleteWantsSize = false;
3234
3235 if (!Ex.get()->isTypeDependent()) {
3236 // Perform lvalue-to-rvalue cast, if needed.
3237 Ex = DefaultLvalueConversion(Ex.get());
3238 if (Ex.isInvalid())
3239 return ExprError();
3240
3241 QualType Type = Ex.get()->getType();
3242
3243 class DeleteConverter : public ContextualImplicitConverter {
3244 public:
3245 DeleteConverter() : ContextualImplicitConverter(false, true) {}
3246
3247 bool match(QualType ConvType) override {
3248 // FIXME: If we have an operator T* and an operator void*, we must pick
3249 // the operator T*.
3250 if (const PointerType *ConvPtrType = ConvType->getAs<PointerType>())
3251 if (ConvPtrType->getPointeeType()->isIncompleteOrObjectType())
3252 return true;
3253 return false;
3254 }
3255
3256 SemaDiagnosticBuilder diagnoseNoMatch(Sema &S, SourceLocation Loc,
3257 QualType T) override {
3258 return S.Diag(Loc, diag::err_delete_operand) << T;
3259 }
3260
3261 SemaDiagnosticBuilder diagnoseIncomplete(Sema &S, SourceLocation Loc,
3262 QualType T) override {
3263 return S.Diag(Loc, diag::err_delete_incomplete_class_type) << T;
3264 }
3265
3266 SemaDiagnosticBuilder diagnoseExplicitConv(Sema &S, SourceLocation Loc,
3267 QualType T,
3268 QualType ConvTy) override {
3269 return S.Diag(Loc, diag::err_delete_explicit_conversion) << T << ConvTy;
3270 }
3271
3272 SemaDiagnosticBuilder noteExplicitConv(Sema &S, CXXConversionDecl *Conv,
3273 QualType ConvTy) override {
3274 return S.Diag(Conv->getLocation(), diag::note_delete_conversion)
3275 << ConvTy;
3276 }
3277
3278 SemaDiagnosticBuilder diagnoseAmbiguous(Sema &S, SourceLocation Loc,
3279 QualType T) override {
3280 return S.Diag(Loc, diag::err_ambiguous_delete_operand) << T;
3281 }
3282
3283 SemaDiagnosticBuilder noteAmbiguous(Sema &S, CXXConversionDecl *Conv,
3284 QualType ConvTy) override {
3285 return S.Diag(Conv->getLocation(), diag::note_delete_conversion)
3286 << ConvTy;
3287 }
3288
3289 SemaDiagnosticBuilder diagnoseConversion(Sema &S, SourceLocation Loc,
3290 QualType T,
3291 QualType ConvTy) override {
3292 llvm_unreachable("conversion functions are permitted")::llvm::llvm_unreachable_internal("conversion functions are permitted"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 3292)
;
3293 }
3294 } Converter;
3295
3296 Ex = PerformContextualImplicitConversion(StartLoc, Ex.get(), Converter);
3297 if (Ex.isInvalid())
3298 return ExprError();
3299 Type = Ex.get()->getType();
3300 if (!Converter.match(Type))
3301 // FIXME: PerformContextualImplicitConversion should return ExprError
3302 // itself in this case.
3303 return ExprError();
3304
3305 QualType Pointee = Type->castAs<PointerType>()->getPointeeType();
3306 QualType PointeeElem = Context.getBaseElementType(Pointee);
3307
3308 if (Pointee.getAddressSpace() != LangAS::Default &&
3309 !getLangOpts().OpenCLCPlusPlus)
3310 return Diag(Ex.get()->getBeginLoc(),
3311 diag::err_address_space_qualified_delete)
3312 << Pointee.getUnqualifiedType()
3313 << Pointee.getQualifiers().getAddressSpaceAttributePrintValue();
3314
3315 CXXRecordDecl *PointeeRD = nullptr;
3316 if (Pointee->isVoidType() && !isSFINAEContext()) {
3317 // The C++ standard bans deleting a pointer to a non-object type, which
3318 // effectively bans deletion of "void*". However, most compilers support
3319 // this, so we treat it as a warning unless we're in a SFINAE context.
3320 Diag(StartLoc, diag::ext_delete_void_ptr_operand)
3321 << Type << Ex.get()->getSourceRange();
3322 } else if (Pointee->isFunctionType() || Pointee->isVoidType()) {
3323 return ExprError(Diag(StartLoc, diag::err_delete_operand)
3324 << Type << Ex.get()->getSourceRange());
3325 } else if (!Pointee->isDependentType()) {
3326 // FIXME: This can result in errors if the definition was imported from a
3327 // module but is hidden.
3328 if (!RequireCompleteType(StartLoc, Pointee,
3329 diag::warn_delete_incomplete, Ex.get())) {
3330 if (const RecordType *RT = PointeeElem->getAs<RecordType>())
3331 PointeeRD = cast<CXXRecordDecl>(RT->getDecl());
3332 }
3333 }
3334
3335 if (Pointee->isArrayType() && !ArrayForm) {
3336 Diag(StartLoc, diag::warn_delete_array_type)
3337 << Type << Ex.get()->getSourceRange()
3338 << FixItHint::CreateInsertion(getLocForEndOfToken(StartLoc), "[]");
3339 ArrayForm = true;
3340 }
3341
3342 DeclarationName DeleteName = Context.DeclarationNames.getCXXOperatorName(
3343 ArrayForm ? OO_Array_Delete : OO_Delete);
3344
3345 if (PointeeRD) {
3346 if (!UseGlobal &&
3347 FindDeallocationFunction(StartLoc, PointeeRD, DeleteName,
3348 OperatorDelete))
3349 return ExprError();
3350
3351 // If we're allocating an array of records, check whether the
3352 // usual operator delete[] has a size_t parameter.
3353 if (ArrayForm) {
3354 // If the user specifically asked to use the global allocator,
3355 // we'll need to do the lookup into the class.
3356 if (UseGlobal)
3357 UsualArrayDeleteWantsSize =
3358 doesUsualArrayDeleteWantSize(*this, StartLoc, PointeeElem);
3359
3360 // Otherwise, the usual operator delete[] should be the
3361 // function we just found.
3362 else if (OperatorDelete && isa<CXXMethodDecl>(OperatorDelete))
3363 UsualArrayDeleteWantsSize =
3364 UsualDeallocFnInfo(*this,
3365 DeclAccessPair::make(OperatorDelete, AS_public))
3366 .HasSizeT;
3367 }
3368
3369 if (!PointeeRD->hasIrrelevantDestructor())
3370 if (CXXDestructorDecl *Dtor = LookupDestructor(PointeeRD)) {
3371 MarkFunctionReferenced(StartLoc,
3372 const_cast<CXXDestructorDecl*>(Dtor));
3373 if (DiagnoseUseOfDecl(Dtor, StartLoc))
3374 return ExprError();
3375 }
3376
3377 CheckVirtualDtorCall(PointeeRD->getDestructor(), StartLoc,
3378 /*IsDelete=*/true, /*CallCanBeVirtual=*/true,
3379 /*WarnOnNonAbstractTypes=*/!ArrayForm,
3380 SourceLocation());
3381 }
3382
3383 if (!OperatorDelete) {
3384 if (getLangOpts().OpenCLCPlusPlus) {
3385 Diag(StartLoc, diag::err_openclcxx_not_supported) << "default delete";
3386 return ExprError();
3387 }
3388
3389 bool IsComplete = isCompleteType(StartLoc, Pointee);
3390 bool CanProvideSize =
3391 IsComplete && (!ArrayForm || UsualArrayDeleteWantsSize ||
3392 Pointee.isDestructedType());
3393 bool Overaligned = hasNewExtendedAlignment(*this, Pointee);
3394
3395 // Look for a global declaration.
3396 OperatorDelete = FindUsualDeallocationFunction(StartLoc, CanProvideSize,
3397 Overaligned, DeleteName);
3398 }
3399
3400 MarkFunctionReferenced(StartLoc, OperatorDelete);
3401
3402 // Check access and ambiguity of destructor if we're going to call it.
3403 // Note that this is required even for a virtual delete.
3404 bool IsVirtualDelete = false;
3405 if (PointeeRD) {
3406 if (CXXDestructorDecl *Dtor = LookupDestructor(PointeeRD)) {
3407 CheckDestructorAccess(Ex.get()->getExprLoc(), Dtor,
3408 PDiag(diag::err_access_dtor) << PointeeElem);
3409 IsVirtualDelete = Dtor->isVirtual();
3410 }
3411 }
3412
3413 DiagnoseUseOfDecl(OperatorDelete, StartLoc);
3414
3415 // Convert the operand to the type of the first parameter of operator
3416 // delete. This is only necessary if we selected a destroying operator
3417 // delete that we are going to call (non-virtually); converting to void*
3418 // is trivial and left to AST consumers to handle.
3419 QualType ParamType = OperatorDelete->getParamDecl(0)->getType();
3420 if (!IsVirtualDelete && !ParamType->getPointeeType()->isVoidType()) {
3421 Qualifiers Qs = Pointee.getQualifiers();
3422 if (Qs.hasCVRQualifiers()) {
3423 // Qualifiers are irrelevant to this conversion; we're only looking
3424 // for access and ambiguity.
3425 Qs.removeCVRQualifiers();
3426 QualType Unqual = Context.getPointerType(
3427 Context.getQualifiedType(Pointee.getUnqualifiedType(), Qs));
3428 Ex = ImpCastExprToType(Ex.get(), Unqual, CK_NoOp);
3429 }
3430 Ex = PerformImplicitConversion(Ex.get(), ParamType, AA_Passing);
3431 if (Ex.isInvalid())
3432 return ExprError();
3433 }
3434 }
3435
3436 CXXDeleteExpr *Result = new (Context) CXXDeleteExpr(
3437 Context.VoidTy, UseGlobal, ArrayForm, ArrayFormAsWritten,
3438 UsualArrayDeleteWantsSize, OperatorDelete, Ex.get(), StartLoc);
3439 AnalyzeDeleteExprMismatch(Result);
3440 return Result;
3441}
3442
3443static bool resolveBuiltinNewDeleteOverload(Sema &S, CallExpr *TheCall,
3444 bool IsDelete,
3445 FunctionDecl *&Operator) {
3446
3447 DeclarationName NewName = S.Context.DeclarationNames.getCXXOperatorName(
3448 IsDelete ? OO_Delete : OO_New);
3449
3450 LookupResult R(S, NewName, TheCall->getBeginLoc(), Sema::LookupOrdinaryName);
3451 S.LookupQualifiedName(R, S.Context.getTranslationUnitDecl());
3452 assert(!R.empty() && "implicitly declared allocation functions not found")((!R.empty() && "implicitly declared allocation functions not found"
) ? static_cast<void> (0) : __assert_fail ("!R.empty() && \"implicitly declared allocation functions not found\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 3452, __PRETTY_FUNCTION__))
;
3453 assert(!R.isAmbiguous() && "global allocation functions are ambiguous")((!R.isAmbiguous() && "global allocation functions are ambiguous"
) ? static_cast<void> (0) : __assert_fail ("!R.isAmbiguous() && \"global allocation functions are ambiguous\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 3453, __PRETTY_FUNCTION__))
;
3454
3455 // We do our own custom access checks below.
3456 R.suppressDiagnostics();
3457
3458 SmallVector<Expr *, 8> Args(TheCall->arg_begin(), TheCall->arg_end());
3459 OverloadCandidateSet Candidates(R.getNameLoc(),
3460 OverloadCandidateSet::CSK_Normal);
3461 for (LookupResult::iterator FnOvl = R.begin(), FnOvlEnd = R.end();
3462 FnOvl != FnOvlEnd; ++FnOvl) {
3463 // Even member operator new/delete are implicitly treated as
3464 // static, so don't use AddMemberCandidate.
3465 NamedDecl *D = (*FnOvl)->getUnderlyingDecl();
3466
3467 if (FunctionTemplateDecl *FnTemplate = dyn_cast<FunctionTemplateDecl>(D)) {
3468 S.AddTemplateOverloadCandidate(FnTemplate, FnOvl.getPair(),
3469 /*ExplicitTemplateArgs=*/nullptr, Args,
3470 Candidates,
3471 /*SuppressUserConversions=*/false);
3472 continue;
3473 }
3474
3475 FunctionDecl *Fn = cast<FunctionDecl>(D);
3476 S.AddOverloadCandidate(Fn, FnOvl.getPair(), Args, Candidates,
3477 /*SuppressUserConversions=*/false);
3478 }
3479
3480 SourceRange Range = TheCall->getSourceRange();
3481
3482 // Do the resolution.
3483 OverloadCandidateSet::iterator Best;
3484 switch (Candidates.BestViableFunction(S, R.getNameLoc(), Best)) {
3485 case OR_Success: {
3486 // Got one!
3487 FunctionDecl *FnDecl = Best->Function;
3488 assert(R.getNamingClass() == nullptr &&((R.getNamingClass() == nullptr && "class members should not be considered"
) ? static_cast<void> (0) : __assert_fail ("R.getNamingClass() == nullptr && \"class members should not be considered\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 3489, __PRETTY_FUNCTION__))
3489 "class members should not be considered")((R.getNamingClass() == nullptr && "class members should not be considered"
) ? static_cast<void> (0) : __assert_fail ("R.getNamingClass() == nullptr && \"class members should not be considered\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 3489, __PRETTY_FUNCTION__))
;
3490
3491 if (!FnDecl->isReplaceableGlobalAllocationFunction()) {
3492 S.Diag(R.getNameLoc(), diag::err_builtin_operator_new_delete_not_usual)
3493 << (IsDelete ? 1 : 0) << Range;
3494 S.Diag(FnDecl->getLocation(), diag::note_non_usual_function_declared_here)
3495 << R.getLookupName() << FnDecl->getSourceRange();
3496 return true;
3497 }
3498
3499 Operator = FnDecl;
3500 return false;
3501 }
3502
3503 case OR_No_Viable_Function:
3504 Candidates.NoteCandidates(
3505 PartialDiagnosticAt(R.getNameLoc(),
3506 S.PDiag(diag::err_ovl_no_viable_function_in_call)
3507 << R.getLookupName() << Range),
3508 S, OCD_AllCandidates, Args);
3509 return true;
3510
3511 case OR_Ambiguous:
3512 Candidates.NoteCandidates(
3513 PartialDiagnosticAt(R.getNameLoc(),
3514 S.PDiag(diag::err_ovl_ambiguous_call)
3515 << R.getLookupName() << Range),
3516 S, OCD_AmbiguousCandidates, Args);
3517 return true;
3518
3519 case OR_Deleted: {
3520 Candidates.NoteCandidates(
3521 PartialDiagnosticAt(R.getNameLoc(), S.PDiag(diag::err_ovl_deleted_call)
3522 << R.getLookupName() << Range),
3523 S, OCD_AllCandidates, Args);
3524 return true;
3525 }
3526 }
3527 llvm_unreachable("Unreachable, bad result from BestViableFunction")::llvm::llvm_unreachable_internal("Unreachable, bad result from BestViableFunction"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 3527)
;
3528}
3529
3530ExprResult
3531Sema::SemaBuiltinOperatorNewDeleteOverloaded(ExprResult TheCallResult,
3532 bool IsDelete) {
3533 CallExpr *TheCall = cast<CallExpr>(TheCallResult.get());
3534 if (!getLangOpts().CPlusPlus) {
3535 Diag(TheCall->getExprLoc(), diag::err_builtin_requires_language)
3536 << (IsDelete ? "__builtin_operator_delete" : "__builtin_operator_new")
3537 << "C++";
3538 return ExprError();
3539 }
3540 // CodeGen assumes it can find the global new and delete to call,
3541 // so ensure that they are declared.
3542 DeclareGlobalNewDelete();
3543
3544 FunctionDecl *OperatorNewOrDelete = nullptr;
3545 if (resolveBuiltinNewDeleteOverload(*this, TheCall, IsDelete,
3546 OperatorNewOrDelete))
3547 return ExprError();
3548 assert(OperatorNewOrDelete && "should be found")((OperatorNewOrDelete && "should be found") ? static_cast
<void> (0) : __assert_fail ("OperatorNewOrDelete && \"should be found\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 3548, __PRETTY_FUNCTION__))
;
3549
3550 DiagnoseUseOfDecl(OperatorNewOrDelete, TheCall->getExprLoc());
3551 MarkFunctionReferenced(TheCall->getExprLoc(), OperatorNewOrDelete);
3552
3553 TheCall->setType(OperatorNewOrDelete->getReturnType());
3554 for (unsigned i = 0; i != TheCall->getNumArgs(); ++i) {
3555 QualType ParamTy = OperatorNewOrDelete->getParamDecl(i)->getType();
3556 InitializedEntity Entity =
3557 InitializedEntity::InitializeParameter(Context, ParamTy, false);
3558 ExprResult Arg = PerformCopyInitialization(
3559 Entity, TheCall->getArg(i)->getBeginLoc(), TheCall->getArg(i));
3560 if (Arg.isInvalid())
3561 return ExprError();
3562 TheCall->setArg(i, Arg.get());
3563 }
3564 auto Callee = dyn_cast<ImplicitCastExpr>(TheCall->getCallee());
3565 assert(Callee && Callee->getCastKind() == CK_BuiltinFnToFnPtr &&((Callee && Callee->getCastKind() == CK_BuiltinFnToFnPtr
&& "Callee expected to be implicit cast to a builtin function pointer"
) ? static_cast<void> (0) : __assert_fail ("Callee && Callee->getCastKind() == CK_BuiltinFnToFnPtr && \"Callee expected to be implicit cast to a builtin function pointer\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 3566, __PRETTY_FUNCTION__))
3566 "Callee expected to be implicit cast to a builtin function pointer")((Callee && Callee->getCastKind() == CK_BuiltinFnToFnPtr
&& "Callee expected to be implicit cast to a builtin function pointer"
) ? static_cast<void> (0) : __assert_fail ("Callee && Callee->getCastKind() == CK_BuiltinFnToFnPtr && \"Callee expected to be implicit cast to a builtin function pointer\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 3566, __PRETTY_FUNCTION__))
;
3567 Callee->setType(OperatorNewOrDelete->getType());
3568
3569 return TheCallResult;
3570}
3571
3572void Sema::CheckVirtualDtorCall(CXXDestructorDecl *dtor, SourceLocation Loc,
3573 bool IsDelete, bool CallCanBeVirtual,
3574 bool WarnOnNonAbstractTypes,
3575 SourceLocation DtorLoc) {
3576 if (!dtor || dtor->isVirtual() || !CallCanBeVirtual || isUnevaluatedContext())
3577 return;
3578
3579 // C++ [expr.delete]p3:
3580 // In the first alternative (delete object), if the static type of the
3581 // object to be deleted is different from its dynamic type, the static
3582 // type shall be a base class of the dynamic type of the object to be
3583 // deleted and the static type shall have a virtual destructor or the
3584 // behavior is undefined.
3585 //
3586 const CXXRecordDecl *PointeeRD = dtor->getParent();
3587 // Note: a final class cannot be derived from, no issue there
3588 if (!PointeeRD->isPolymorphic() || PointeeRD->hasAttr<FinalAttr>())
3589 return;
3590
3591 // If the superclass is in a system header, there's nothing that can be done.
3592 // The `delete` (where we emit the warning) can be in a system header,
3593 // what matters for this warning is where the deleted type is defined.
3594 if (getSourceManager().isInSystemHeader(PointeeRD->getLocation()))
3595 return;
3596
3597 QualType ClassType = dtor->getThisType()->getPointeeType();
3598 if (PointeeRD->isAbstract()) {
3599 // If the class is abstract, we warn by default, because we're
3600 // sure the code has undefined behavior.
3601 Diag(Loc, diag::warn_delete_abstract_non_virtual_dtor) << (IsDelete ? 0 : 1)
3602 << ClassType;
3603 } else if (WarnOnNonAbstractTypes) {
3604 // Otherwise, if this is not an array delete, it's a bit suspect,
3605 // but not necessarily wrong.
3606 Diag(Loc, diag::warn_delete_non_virtual_dtor) << (IsDelete ? 0 : 1)
3607 << ClassType;
3608 }
3609 if (!IsDelete) {
3610 std::string TypeStr;
3611 ClassType.getAsStringInternal(TypeStr, getPrintingPolicy());
3612 Diag(DtorLoc, diag::note_delete_non_virtual)
3613 << FixItHint::CreateInsertion(DtorLoc, TypeStr + "::");
3614 }
3615}
3616
3617Sema::ConditionResult Sema::ActOnConditionVariable(Decl *ConditionVar,
3618 SourceLocation StmtLoc,
3619 ConditionKind CK) {
3620 ExprResult E =
3621 CheckConditionVariable(cast<VarDecl>(ConditionVar), StmtLoc, CK);
3622 if (E.isInvalid())
3623 return ConditionError();
3624 return ConditionResult(*this, ConditionVar, MakeFullExpr(E.get(), StmtLoc),
3625 CK == ConditionKind::ConstexprIf);
3626}
3627
3628/// Check the use of the given variable as a C++ condition in an if,
3629/// while, do-while, or switch statement.
3630ExprResult Sema::CheckConditionVariable(VarDecl *ConditionVar,
3631 SourceLocation StmtLoc,
3632 ConditionKind CK) {
3633 if (ConditionVar->isInvalidDecl())
3634 return ExprError();
3635
3636 QualType T = ConditionVar->getType();
3637
3638 // C++ [stmt.select]p2:
3639 // The declarator shall not specify a function or an array.
3640 if (T->isFunctionType())
3641 return ExprError(Diag(ConditionVar->getLocation(),
3642 diag::err_invalid_use_of_function_type)
3643 << ConditionVar->getSourceRange());
3644 else if (T->isArrayType())
3645 return ExprError(Diag(ConditionVar->getLocation(),
3646 diag::err_invalid_use_of_array_type)
3647 << ConditionVar->getSourceRange());
3648
3649 ExprResult Condition = BuildDeclRefExpr(
3650 ConditionVar, ConditionVar->getType().getNonReferenceType(), VK_LValue,
3651 ConditionVar->getLocation());
3652
3653 switch (CK) {
3654 case ConditionKind::Boolean:
3655 return CheckBooleanCondition(StmtLoc, Condition.get());
3656
3657 case ConditionKind::ConstexprIf:
3658 return CheckBooleanCondition(StmtLoc, Condition.get(), true);
3659
3660 case ConditionKind::Switch:
3661 return CheckSwitchCondition(StmtLoc, Condition.get());
3662 }
3663
3664 llvm_unreachable("unexpected condition kind")::llvm::llvm_unreachable_internal("unexpected condition kind"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 3664)
;
3665}
3666
3667/// CheckCXXBooleanCondition - Returns true if a conversion to bool is invalid.
3668ExprResult Sema::CheckCXXBooleanCondition(Expr *CondExpr, bool IsConstexpr) {
3669 // C++ 6.4p4:
3670 // The value of a condition that is an initialized declaration in a statement
3671 // other than a switch statement is the value of the declared variable
3672 // implicitly converted to type bool. If that conversion is ill-formed, the
3673 // program is ill-formed.
3674 // The value of a condition that is an expression is the value of the
3675 // expression, implicitly converted to bool.
3676 //
3677 // FIXME: Return this value to the caller so they don't need to recompute it.
3678 llvm::APSInt Value(/*BitWidth*/1);
3679 return (IsConstexpr && !CondExpr->isValueDependent())
3680 ? CheckConvertedConstantExpression(CondExpr, Context.BoolTy, Value,
3681 CCEK_ConstexprIf)
3682 : PerformContextuallyConvertToBool(CondExpr);
3683}
3684
3685/// Helper function to determine whether this is the (deprecated) C++
3686/// conversion from a string literal to a pointer to non-const char or
3687/// non-const wchar_t (for narrow and wide string literals,
3688/// respectively).
3689bool
3690Sema::IsStringLiteralToNonConstPointerConversion(Expr *From, QualType ToType) {
3691 // Look inside the implicit cast, if it exists.
3692 if (ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(From))
3693 From = Cast->getSubExpr();
3694
3695 // A string literal (2.13.4) that is not a wide string literal can
3696 // be converted to an rvalue of type "pointer to char"; a wide
3697 // string literal can be converted to an rvalue of type "pointer
3698 // to wchar_t" (C++ 4.2p2).
3699 if (StringLiteral *StrLit = dyn_cast<StringLiteral>(From->IgnoreParens()))
3700 if (const PointerType *ToPtrType = ToType->getAs<PointerType>())
3701 if (const BuiltinType *ToPointeeType
3702 = ToPtrType->getPointeeType()->getAs<BuiltinType>()) {
3703 // This conversion is considered only when there is an
3704 // explicit appropriate pointer target type (C++ 4.2p2).
3705 if (!ToPtrType->getPointeeType().hasQualifiers()) {
3706 switch (StrLit->getKind()) {
3707 case StringLiteral::UTF8:
3708 case StringLiteral::UTF16:
3709 case StringLiteral::UTF32:
3710 // We don't allow UTF literals to be implicitly converted
3711 break;
3712 case StringLiteral::Ascii:
3713 return (ToPointeeType->getKind() == BuiltinType::Char_U ||
3714 ToPointeeType->getKind() == BuiltinType::Char_S);
3715 case StringLiteral::Wide:
3716 return Context.typesAreCompatible(Context.getWideCharType(),
3717 QualType(ToPointeeType, 0));
3718 }
3719 }
3720 }
3721
3722 return false;
3723}
3724
3725static ExprResult BuildCXXCastArgument(Sema &S,
3726 SourceLocation CastLoc,
3727 QualType Ty,
3728 CastKind Kind,
3729 CXXMethodDecl *Method,
3730 DeclAccessPair FoundDecl,
3731 bool HadMultipleCandidates,
3732 Expr *From) {
3733 switch (Kind) {
3734 default: llvm_unreachable("Unhandled cast kind!")::llvm::llvm_unreachable_internal("Unhandled cast kind!", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 3734)
;
3735 case CK_ConstructorConversion: {
3736 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Method);
3737 SmallVector<Expr*, 8> ConstructorArgs;
3738
3739 if (S.RequireNonAbstractType(CastLoc, Ty,
3740 diag::err_allocation_of_abstract_type))
3741 return ExprError();
3742
3743 if (S.CompleteConstructorCall(Constructor, From, CastLoc, ConstructorArgs))
3744 return ExprError();
3745
3746 S.CheckConstructorAccess(CastLoc, Constructor, FoundDecl,
3747 InitializedEntity::InitializeTemporary(Ty));
3748 if (S.DiagnoseUseOfDecl(Method, CastLoc))
3749 return ExprError();
3750
3751 ExprResult Result = S.BuildCXXConstructExpr(
3752 CastLoc, Ty, FoundDecl, cast<CXXConstructorDecl>(Method),
3753 ConstructorArgs, HadMultipleCandidates,
3754 /*ListInit*/ false, /*StdInitListInit*/ false, /*ZeroInit*/ false,
3755 CXXConstructExpr::CK_Complete, SourceRange());
3756 if (Result.isInvalid())
3757 return ExprError();
3758
3759 return S.MaybeBindToTemporary(Result.getAs<Expr>());
3760 }
3761
3762 case CK_UserDefinedConversion: {
3763 assert(!From->getType()->isPointerType() && "Arg can't have pointer type!")((!From->getType()->isPointerType() && "Arg can't have pointer type!"
) ? static_cast<void> (0) : __assert_fail ("!From->getType()->isPointerType() && \"Arg can't have pointer type!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 3763, __PRETTY_FUNCTION__))
;
3764
3765 S.CheckMemberOperatorAccess(CastLoc, From, /*arg*/ nullptr, FoundDecl);
3766 if (S.DiagnoseUseOfDecl(Method, CastLoc))
3767 return ExprError();
3768
3769 // Create an implicit call expr that calls it.
3770 CXXConversionDecl *Conv = cast<CXXConversionDecl>(Method);
3771 ExprResult Result = S.BuildCXXMemberCallExpr(From, FoundDecl, Conv,
3772 HadMultipleCandidates);
3773 if (Result.isInvalid())
3774 return ExprError();
3775 // Record usage of conversion in an implicit cast.
3776 Result = ImplicitCastExpr::Create(S.Context, Result.get()->getType(),
3777 CK_UserDefinedConversion, Result.get(),
3778 nullptr, Result.get()->getValueKind());
3779
3780 return S.MaybeBindToTemporary(Result.get());
3781 }
3782 }
3783}
3784
3785/// PerformImplicitConversion - Perform an implicit conversion of the
3786/// expression From to the type ToType using the pre-computed implicit
3787/// conversion sequence ICS. Returns the converted
3788/// expression. Action is the kind of conversion we're performing,
3789/// used in the error message.
3790ExprResult
3791Sema::PerformImplicitConversion(Expr *From, QualType ToType,
3792 const ImplicitConversionSequence &ICS,
3793 AssignmentAction Action,
3794 CheckedConversionKind CCK) {
3795 // C++ [over.match.oper]p7: [...] operands of class type are converted [...]
3796 if (CCK == CCK_ForBuiltinOverloadedOp && !From->getType()->isRecordType())
3797 return From;
3798
3799 switch (ICS.getKind()) {
3800 case ImplicitConversionSequence::StandardConversion: {
3801 ExprResult Res = PerformImplicitConversion(From, ToType, ICS.Standard,
3802 Action, CCK);
3803 if (Res.isInvalid())
3804 return ExprError();
3805 From = Res.get();
3806 break;
3807 }
3808
3809 case ImplicitConversionSequence::UserDefinedConversion: {
3810
3811 FunctionDecl *FD = ICS.UserDefined.ConversionFunction;
3812 CastKind CastKind;
3813 QualType BeforeToType;
3814 assert(FD && "no conversion function for user-defined conversion seq")((FD && "no conversion function for user-defined conversion seq"
) ? static_cast<void> (0) : __assert_fail ("FD && \"no conversion function for user-defined conversion seq\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 3814, __PRETTY_FUNCTION__))
;
3815 if (const CXXConversionDecl *Conv = dyn_cast<CXXConversionDecl>(FD)) {
3816 CastKind = CK_UserDefinedConversion;
3817
3818 // If the user-defined conversion is specified by a conversion function,
3819 // the initial standard conversion sequence converts the source type to
3820 // the implicit object parameter of the conversion function.
3821 BeforeToType = Context.getTagDeclType(Conv->getParent());
3822 } else {
3823 const CXXConstructorDecl *Ctor = cast<CXXConstructorDecl>(FD);
3824 CastKind = CK_ConstructorConversion;
3825 // Do no conversion if dealing with ... for the first conversion.
3826 if (!ICS.UserDefined.EllipsisConversion) {
3827 // If the user-defined conversion is specified by a constructor, the
3828 // initial standard conversion sequence converts the source type to
3829 // the type required by the argument of the constructor
3830 BeforeToType = Ctor->getParamDecl(0)->getType().getNonReferenceType();
3831 }
3832 }
3833 // Watch out for ellipsis conversion.
3834 if (!ICS.UserDefined.EllipsisConversion) {
3835 ExprResult Res =
3836 PerformImplicitConversion(From, BeforeToType,
3837 ICS.UserDefined.Before, AA_Converting,
3838 CCK);
3839 if (Res.isInvalid())
3840 return ExprError();
3841 From = Res.get();
3842 }
3843
3844 ExprResult CastArg = BuildCXXCastArgument(
3845 *this, From->getBeginLoc(), ToType.getNonReferenceType(), CastKind,
3846 cast<CXXMethodDecl>(FD), ICS.UserDefined.FoundConversionFunction,
3847 ICS.UserDefined.HadMultipleCandidates, From);
3848
3849 if (CastArg.isInvalid())
3850 return ExprError();
3851
3852 From = CastArg.get();
3853
3854 // C++ [over.match.oper]p7:
3855 // [...] the second standard conversion sequence of a user-defined
3856 // conversion sequence is not applied.
3857 if (CCK == CCK_ForBuiltinOverloadedOp)
3858 return From;
3859
3860 return PerformImplicitConversion(From, ToType, ICS.UserDefined.After,
3861 AA_Converting, CCK);
3862 }
3863
3864 case ImplicitConversionSequence::AmbiguousConversion:
3865 ICS.DiagnoseAmbiguousConversion(*this, From->getExprLoc(),
3866 PDiag(diag::err_typecheck_ambiguous_condition)
3867 << From->getSourceRange());
3868 return ExprError();
3869
3870 case ImplicitConversionSequence::EllipsisConversion:
3871 llvm_unreachable("Cannot perform an ellipsis conversion")::llvm::llvm_unreachable_internal("Cannot perform an ellipsis conversion"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 3871)
;
3872
3873 case ImplicitConversionSequence::BadConversion:
3874 bool Diagnosed =
3875 DiagnoseAssignmentResult(Incompatible, From->getExprLoc(), ToType,
3876 From->getType(), From, Action);
3877 assert(Diagnosed && "failed to diagnose bad conversion")((Diagnosed && "failed to diagnose bad conversion") ?
static_cast<void> (0) : __assert_fail ("Diagnosed && \"failed to diagnose bad conversion\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 3877, __PRETTY_FUNCTION__))
; (void)Diagnosed;
3878 return ExprError();
3879 }
3880
3881 // Everything went well.
3882 return From;
3883}
3884
3885/// PerformImplicitConversion - Perform an implicit conversion of the
3886/// expression From to the type ToType by following the standard
3887/// conversion sequence SCS. Returns the converted
3888/// expression. Flavor is the context in which we're performing this
3889/// conversion, for use in error messages.
3890ExprResult
3891Sema::PerformImplicitConversion(Expr *From, QualType ToType,
3892 const StandardConversionSequence& SCS,
3893 AssignmentAction Action,
3894 CheckedConversionKind CCK) {
3895 bool CStyle = (CCK == CCK_CStyleCast || CCK == CCK_FunctionalCast);
3896
3897 // Overall FIXME: we are recomputing too many types here and doing far too
3898 // much extra work. What this means is that we need to keep track of more
3899 // information that is computed when we try the implicit conversion initially,
3900 // so that we don't need to recompute anything here.
3901 QualType FromType = From->getType();
3902
3903 if (SCS.CopyConstructor) {
3904 // FIXME: When can ToType be a reference type?
3905 assert(!ToType->isReferenceType())((!ToType->isReferenceType()) ? static_cast<void> (0
) : __assert_fail ("!ToType->isReferenceType()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 3905, __PRETTY_FUNCTION__))
;
3906 if (SCS.Second == ICK_Derived_To_Base) {
3907 SmallVector<Expr*, 8> ConstructorArgs;
3908 if (CompleteConstructorCall(cast<CXXConstructorDecl>(SCS.CopyConstructor),
3909 From, /*FIXME:ConstructLoc*/SourceLocation(),
3910 ConstructorArgs))
3911 return ExprError();
3912 return BuildCXXConstructExpr(
3913 /*FIXME:ConstructLoc*/ SourceLocation(), ToType,
3914 SCS.FoundCopyConstructor, SCS.CopyConstructor,
3915 ConstructorArgs, /*HadMultipleCandidates*/ false,
3916 /*ListInit*/ false, /*StdInitListInit*/ false, /*ZeroInit*/ false,
3917 CXXConstructExpr::CK_Complete, SourceRange());
3918 }
3919 return BuildCXXConstructExpr(
3920 /*FIXME:ConstructLoc*/ SourceLocation(), ToType,
3921 SCS.FoundCopyConstructor, SCS.CopyConstructor,
3922 From, /*HadMultipleCandidates*/ false,
3923 /*ListInit*/ false, /*StdInitListInit*/ false, /*ZeroInit*/ false,
3924 CXXConstructExpr::CK_Complete, SourceRange());
3925 }
3926
3927 // Resolve overloaded function references.
3928 if (Context.hasSameType(FromType, Context.OverloadTy)) {
3929 DeclAccessPair Found;
3930 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(From, ToType,
3931 true, Found);
3932 if (!Fn)
3933 return ExprError();
3934
3935 if (DiagnoseUseOfDecl(Fn, From->getBeginLoc()))
3936 return ExprError();
3937
3938 From = FixOverloadedFunctionReference(From, Found, Fn);
3939 FromType = From->getType();
3940 }
3941
3942 // If we're converting to an atomic type, first convert to the corresponding
3943 // non-atomic type.
3944 QualType ToAtomicType;
3945 if (const AtomicType *ToAtomic = ToType->getAs<AtomicType>()) {
3946 ToAtomicType = ToType;
3947 ToType = ToAtomic->getValueType();
3948 }
3949
3950 QualType InitialFromType = FromType;
3951 // Perform the first implicit conversion.
3952 switch (SCS.First) {
3953 case ICK_Identity:
3954 if (const AtomicType *FromAtomic = FromType->getAs<AtomicType>()) {
3955 FromType = FromAtomic->getValueType().getUnqualifiedType();
3956 From = ImplicitCastExpr::Create(Context, FromType, CK_AtomicToNonAtomic,
3957 From, /*BasePath=*/nullptr, VK_RValue);
3958 }
3959 break;
3960
3961 case ICK_Lvalue_To_Rvalue: {
3962 assert(From->getObjectKind() != OK_ObjCProperty)((From->getObjectKind() != OK_ObjCProperty) ? static_cast<
void> (0) : __assert_fail ("From->getObjectKind() != OK_ObjCProperty"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 3962, __PRETTY_FUNCTION__))
;
3963 ExprResult FromRes = DefaultLvalueConversion(From);
3964 assert(!FromRes.isInvalid() && "Can't perform deduced conversion?!")((!FromRes.isInvalid() && "Can't perform deduced conversion?!"
) ? static_cast<void> (0) : __assert_fail ("!FromRes.isInvalid() && \"Can't perform deduced conversion?!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 3964, __PRETTY_FUNCTION__))
;
3965 From = FromRes.get();
3966 FromType = From->getType();
3967 break;
3968 }
3969
3970 case ICK_Array_To_Pointer:
3971 FromType = Context.getArrayDecayedType(FromType);
3972 From = ImpCastExprToType(From, FromType, CK_ArrayToPointerDecay,
3973 VK_RValue, /*BasePath=*/nullptr, CCK).get();
3974 break;
3975
3976 case ICK_Function_To_Pointer:
3977 FromType = Context.getPointerType(FromType);
3978 From = ImpCastExprToType(From, FromType, CK_FunctionToPointerDecay,
3979 VK_RValue, /*BasePath=*/nullptr, CCK).get();
3980 break;
3981
3982 default:
3983 llvm_unreachable("Improper first standard conversion")::llvm::llvm_unreachable_internal("Improper first standard conversion"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 3983)
;
3984 }
3985
3986 // Perform the second implicit conversion
3987 switch (SCS.Second) {
3988 case ICK_Identity:
3989 // C++ [except.spec]p5:
3990 // [For] assignment to and initialization of pointers to functions,
3991 // pointers to member functions, and references to functions: the
3992 // target entity shall allow at least the exceptions allowed by the
3993 // source value in the assignment or initialization.
3994 switch (Action) {
3995 case AA_Assigning:
3996 case AA_Initializing:
3997 // Note, function argument passing and returning are initialization.
3998 case AA_Passing:
3999 case AA_Returning:
4000 case AA_Sending:
4001 case AA_Passing_CFAudited:
4002 if (CheckExceptionSpecCompatibility(From, ToType))
4003 return ExprError();
4004 break;
4005
4006 case AA_Casting:
4007 case AA_Converting:
4008 // Casts and implicit conversions are not initialization, so are not
4009 // checked for exception specification mismatches.
4010 break;
4011 }
4012 // Nothing else to do.
4013 break;
4014
4015 case ICK_Integral_Promotion:
4016 case ICK_Integral_Conversion:
4017 if (ToType->isBooleanType()) {
4018 assert(FromType->castAs<EnumType>()->getDecl()->isFixed() &&((FromType->castAs<EnumType>()->getDecl()->isFixed
() && SCS.Second == ICK_Integral_Promotion &&
"only enums with fixed underlying type can promote to bool")
? static_cast<void> (0) : __assert_fail ("FromType->castAs<EnumType>()->getDecl()->isFixed() && SCS.Second == ICK_Integral_Promotion && \"only enums with fixed underlying type can promote to bool\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 4020, __PRETTY_FUNCTION__))
4019 SCS.Second == ICK_Integral_Promotion &&((FromType->castAs<EnumType>()->getDecl()->isFixed
() && SCS.Second == ICK_Integral_Promotion &&
"only enums with fixed underlying type can promote to bool")
? static_cast<void> (0) : __assert_fail ("FromType->castAs<EnumType>()->getDecl()->isFixed() && SCS.Second == ICK_Integral_Promotion && \"only enums with fixed underlying type can promote to bool\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 4020, __PRETTY_FUNCTION__))
4020 "only enums with fixed underlying type can promote to bool")((FromType->castAs<EnumType>()->getDecl()->isFixed
() && SCS.Second == ICK_Integral_Promotion &&
"only enums with fixed underlying type can promote to bool")
? static_cast<void> (0) : __assert_fail ("FromType->castAs<EnumType>()->getDecl()->isFixed() && SCS.Second == ICK_Integral_Promotion && \"only enums with fixed underlying type can promote to bool\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 4020, __PRETTY_FUNCTION__))
;
4021 From = ImpCastExprToType(From, ToType, CK_IntegralToBoolean,
4022 VK_RValue, /*BasePath=*/nullptr, CCK).get();
4023 } else {
4024 From = ImpCastExprToType(From, ToType, CK_IntegralCast,
4025 VK_RValue, /*BasePath=*/nullptr, CCK).get();
4026 }
4027 break;
4028
4029 case ICK_Floating_Promotion:
4030 case ICK_Floating_Conversion:
4031 From = ImpCastExprToType(From, ToType, CK_FloatingCast,
4032 VK_RValue, /*BasePath=*/nullptr, CCK).get();
4033 break;
4034
4035 case ICK_Complex_Promotion:
4036 case ICK_Complex_Conversion: {
4037 QualType FromEl = From->getType()->castAs<ComplexType>()->getElementType();
4038 QualType ToEl = ToType->castAs<ComplexType>()->getElementType();
4039 CastKind CK;
4040 if (FromEl->isRealFloatingType()) {
4041 if (ToEl->isRealFloatingType())
4042 CK = CK_FloatingComplexCast;
4043 else
4044 CK = CK_FloatingComplexToIntegralComplex;
4045 } else if (ToEl->isRealFloatingType()) {
4046 CK = CK_IntegralComplexToFloatingComplex;
4047 } else {
4048 CK = CK_IntegralComplexCast;
4049 }
4050 From = ImpCastExprToType(From, ToType, CK,
4051 VK_RValue, /*BasePath=*/nullptr, CCK).get();
4052 break;
4053 }
4054
4055 case ICK_Floating_Integral:
4056 if (ToType->isRealFloatingType())
4057 From = ImpCastExprToType(From, ToType, CK_IntegralToFloating,
4058 VK_RValue, /*BasePath=*/nullptr, CCK).get();
4059 else
4060 From = ImpCastExprToType(From, ToType, CK_FloatingToIntegral,
4061 VK_RValue, /*BasePath=*/nullptr, CCK).get();
4062 break;
4063
4064 case ICK_Compatible_Conversion:
4065 From = ImpCastExprToType(From, ToType, CK_NoOp,
4066 VK_RValue, /*BasePath=*/nullptr, CCK).get();
4067 break;
4068
4069 case ICK_Writeback_Conversion:
4070 case ICK_Pointer_Conversion: {
4071 if (SCS.IncompatibleObjC && Action != AA_Casting) {
4072 // Diagnose incompatible Objective-C conversions
4073 if (Action == AA_Initializing || Action == AA_Assigning)
4074 Diag(From->getBeginLoc(),
4075 diag::ext_typecheck_convert_incompatible_pointer)
4076 << ToType << From->getType() << Action << From->getSourceRange()
4077 << 0;
4078 else
4079 Diag(From->getBeginLoc(),
4080 diag::ext_typecheck_convert_incompatible_pointer)
4081 << From->getType() << ToType << Action << From->getSourceRange()
4082 << 0;
4083
4084 if (From->getType()->isObjCObjectPointerType() &&
4085 ToType->isObjCObjectPointerType())
4086 EmitRelatedResultTypeNote(From);
4087 } else if (getLangOpts().allowsNonTrivialObjCLifetimeQualifiers() &&
4088 !CheckObjCARCUnavailableWeakConversion(ToType,
4089 From->getType())) {
4090 if (Action == AA_Initializing)
4091 Diag(From->getBeginLoc(), diag::err_arc_weak_unavailable_assign);
4092 else
4093 Diag(From->getBeginLoc(), diag::err_arc_convesion_of_weak_unavailable)
4094 << (Action == AA_Casting) << From->getType() << ToType
4095 << From->getSourceRange();
4096 }
4097
4098 // Defer address space conversion to the third conversion.
4099 QualType FromPteeType = From->getType()->getPointeeType();
4100 QualType ToPteeType = ToType->getPointeeType();
4101 QualType NewToType = ToType;
4102 if (!FromPteeType.isNull() && !ToPteeType.isNull() &&
4103 FromPteeType.getAddressSpace() != ToPteeType.getAddressSpace()) {
4104 NewToType = Context.removeAddrSpaceQualType(ToPteeType);
4105 NewToType = Context.getAddrSpaceQualType(NewToType,
4106 FromPteeType.getAddressSpace());
4107 if (ToType->isObjCObjectPointerType())
4108 NewToType = Context.getObjCObjectPointerType(NewToType);
4109 else if (ToType->isBlockPointerType())
4110 NewToType = Context.getBlockPointerType(NewToType);
4111 else
4112 NewToType = Context.getPointerType(NewToType);
4113 }
4114
4115 CastKind Kind;
4116 CXXCastPath BasePath;
4117 if (CheckPointerConversion(From, NewToType, Kind, BasePath, CStyle))
4118 return ExprError();
4119
4120 // Make sure we extend blocks if necessary.
4121 // FIXME: doing this here is really ugly.
4122 if (Kind == CK_BlockPointerToObjCPointerCast) {
4123 ExprResult E = From;
4124 (void) PrepareCastToObjCObjectPointer(E);
4125 From = E.get();
4126 }
4127 if (getLangOpts().allowsNonTrivialObjCLifetimeQualifiers())
4128 CheckObjCConversion(SourceRange(), NewToType, From, CCK);
4129 From = ImpCastExprToType(From, NewToType, Kind, VK_RValue, &BasePath, CCK)
4130 .get();
4131 break;
4132 }
4133
4134 case ICK_Pointer_Member: {
4135 CastKind Kind;
4136 CXXCastPath BasePath;
4137 if (CheckMemberPointerConversion(From, ToType, Kind, BasePath, CStyle))
4138 return ExprError();
4139 if (CheckExceptionSpecCompatibility(From, ToType))
4140 return ExprError();
4141
4142 // We may not have been able to figure out what this member pointer resolved
4143 // to up until this exact point. Attempt to lock-in it's inheritance model.
4144 if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
4145 (void)isCompleteType(From->getExprLoc(), From->getType());
4146 (void)isCompleteType(From->getExprLoc(), ToType);
4147 }
4148
4149 From = ImpCastExprToType(From, ToType, Kind, VK_RValue, &BasePath, CCK)
4150 .get();
4151 break;
4152 }
4153
4154 case ICK_Boolean_Conversion:
4155 // Perform half-to-boolean conversion via float.
4156 if (From->getType()->isHalfType()) {
4157 From = ImpCastExprToType(From, Context.FloatTy, CK_FloatingCast).get();
4158 FromType = Context.FloatTy;
4159 }
4160
4161 From = ImpCastExprToType(From, Context.BoolTy,
4162 ScalarTypeToBooleanCastKind(FromType),
4163 VK_RValue, /*BasePath=*/nullptr, CCK).get();
4164 break;
4165
4166 case ICK_Derived_To_Base: {
4167 CXXCastPath BasePath;
4168 if (CheckDerivedToBaseConversion(
4169 From->getType(), ToType.getNonReferenceType(), From->getBeginLoc(),
4170 From->getSourceRange(), &BasePath, CStyle))
4171 return ExprError();
4172
4173 From = ImpCastExprToType(From, ToType.getNonReferenceType(),
4174 CK_DerivedToBase, From->getValueKind(),
4175 &BasePath, CCK).get();
4176 break;
4177 }
4178
4179 case ICK_Vector_Conversion:
4180 From = ImpCastExprToType(From, ToType, CK_BitCast,
4181 VK_RValue, /*BasePath=*/nullptr, CCK).get();
4182 break;
4183
4184 case ICK_Vector_Splat: {
4185 // Vector splat from any arithmetic type to a vector.
4186 Expr *Elem = prepareVectorSplat(ToType, From).get();
4187 From = ImpCastExprToType(Elem, ToType, CK_VectorSplat, VK_RValue,
4188 /*BasePath=*/nullptr, CCK).get();
4189 break;
4190 }
4191
4192 case ICK_Complex_Real:
4193 // Case 1. x -> _Complex y
4194 if (const ComplexType *ToComplex = ToType->getAs<ComplexType>()) {
4195 QualType ElType = ToComplex->getElementType();
4196 bool isFloatingComplex = ElType->isRealFloatingType();
4197
4198 // x -> y
4199 if (Context.hasSameUnqualifiedType(ElType, From->getType())) {
4200 // do nothing
4201 } else if (From->getType()->isRealFloatingType()) {
4202 From = ImpCastExprToType(From, ElType,
4203 isFloatingComplex ? CK_FloatingCast : CK_FloatingToIntegral).get();
4204 } else {
4205 assert(From->getType()->isIntegerType())((From->getType()->isIntegerType()) ? static_cast<void
> (0) : __assert_fail ("From->getType()->isIntegerType()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 4205, __PRETTY_FUNCTION__))
;
4206 From = ImpCastExprToType(From, ElType,
4207 isFloatingComplex ? CK_IntegralToFloating : CK_IntegralCast).get();
4208 }
4209 // y -> _Complex y
4210 From = ImpCastExprToType(From, ToType,
4211 isFloatingComplex ? CK_FloatingRealToComplex
4212 : CK_IntegralRealToComplex).get();
4213
4214 // Case 2. _Complex x -> y
4215 } else {
4216 const ComplexType *FromComplex = From->getType()->getAs<ComplexType>();
4217 assert(FromComplex)((FromComplex) ? static_cast<void> (0) : __assert_fail (
"FromComplex", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 4217, __PRETTY_FUNCTION__))
;
4218
4219 QualType ElType = FromComplex->getElementType();
4220 bool isFloatingComplex = ElType->isRealFloatingType();
4221
4222 // _Complex x -> x
4223 From = ImpCastExprToType(From, ElType,
4224 isFloatingComplex ? CK_FloatingComplexToReal
4225 : CK_IntegralComplexToReal,
4226 VK_RValue, /*BasePath=*/nullptr, CCK).get();
4227
4228 // x -> y
4229 if (Context.hasSameUnqualifiedType(ElType, ToType)) {
4230 // do nothing
4231 } else if (ToType->isRealFloatingType()) {
4232 From = ImpCastExprToType(From, ToType,
4233 isFloatingComplex ? CK_FloatingCast : CK_IntegralToFloating,
4234 VK_RValue, /*BasePath=*/nullptr, CCK).get();
4235 } else {
4236 assert(ToType->isIntegerType())((ToType->isIntegerType()) ? static_cast<void> (0) :
__assert_fail ("ToType->isIntegerType()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 4236, __PRETTY_FUNCTION__))
;
4237 From = ImpCastExprToType(From, ToType,
4238 isFloatingComplex ? CK_FloatingToIntegral : CK_IntegralCast,
4239 VK_RValue, /*BasePath=*/nullptr, CCK).get();
4240 }
4241 }
4242 break;
4243
4244 case ICK_Block_Pointer_Conversion: {
4245 LangAS AddrSpaceL =
4246 ToType->castAs<BlockPointerType>()->getPointeeType().getAddressSpace();
4247 LangAS AddrSpaceR =
4248 FromType->castAs<BlockPointerType>()->getPointeeType().getAddressSpace();
4249 assert(Qualifiers::isAddressSpaceSupersetOf(AddrSpaceL, AddrSpaceR) &&((Qualifiers::isAddressSpaceSupersetOf(AddrSpaceL, AddrSpaceR
) && "Invalid cast") ? static_cast<void> (0) : __assert_fail
("Qualifiers::isAddressSpaceSupersetOf(AddrSpaceL, AddrSpaceR) && \"Invalid cast\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 4250, __PRETTY_FUNCTION__))
4250 "Invalid cast")((Qualifiers::isAddressSpaceSupersetOf(AddrSpaceL, AddrSpaceR
) && "Invalid cast") ? static_cast<void> (0) : __assert_fail
("Qualifiers::isAddressSpaceSupersetOf(AddrSpaceL, AddrSpaceR) && \"Invalid cast\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 4250, __PRETTY_FUNCTION__))
;
4251 CastKind Kind =
4252 AddrSpaceL != AddrSpaceR ? CK_AddressSpaceConversion : CK_BitCast;
4253 From = ImpCastExprToType(From, ToType.getUnqualifiedType(), Kind,
4254 VK_RValue, /*BasePath=*/nullptr, CCK).get();
4255 break;
4256 }
4257
4258 case ICK_TransparentUnionConversion: {
4259 ExprResult FromRes = From;
4260 Sema::AssignConvertType ConvTy =
4261 CheckTransparentUnionArgumentConstraints(ToType, FromRes);
4262 if (FromRes.isInvalid())
4263 return ExprError();
4264 From = FromRes.get();
4265 assert ((ConvTy == Sema::Compatible) &&(((ConvTy == Sema::Compatible) && "Improper transparent union conversion"
) ? static_cast<void> (0) : __assert_fail ("(ConvTy == Sema::Compatible) && \"Improper transparent union conversion\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 4266, __PRETTY_FUNCTION__))
4266 "Improper transparent union conversion")(((ConvTy == Sema::Compatible) && "Improper transparent union conversion"
) ? static_cast<void> (0) : __assert_fail ("(ConvTy == Sema::Compatible) && \"Improper transparent union conversion\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 4266, __PRETTY_FUNCTION__))
;
4267 (void)ConvTy;
4268 break;
4269 }
4270
4271 case ICK_Zero_Event_Conversion:
4272 case ICK_Zero_Queue_Conversion:
4273 From = ImpCastExprToType(From, ToType,
4274 CK_ZeroToOCLOpaqueType,
4275 From->getValueKind()).get();
4276 break;
4277
4278 case ICK_Lvalue_To_Rvalue:
4279 case ICK_Array_To_Pointer:
4280 case ICK_Function_To_Pointer:
4281 case ICK_Function_Conversion:
4282 case ICK_Qualification:
4283 case ICK_Num_Conversion_Kinds:
4284 case ICK_C_Only_Conversion:
4285 case ICK_Incompatible_Pointer_Conversion:
4286 llvm_unreachable("Improper second standard conversion")::llvm::llvm_unreachable_internal("Improper second standard conversion"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 4286)
;
4287 }
4288
4289 switch (SCS.Third) {
4290 case ICK_Identity:
4291 // Nothing to do.
4292 break;
4293
4294 case ICK_Function_Conversion:
4295 // If both sides are functions (or pointers/references to them), there could
4296 // be incompatible exception declarations.
4297 if (CheckExceptionSpecCompatibility(From, ToType))
4298 return ExprError();
4299
4300 From = ImpCastExprToType(From, ToType, CK_NoOp,
4301 VK_RValue, /*BasePath=*/nullptr, CCK).get();
4302 break;
4303
4304 case ICK_Qualification: {
4305 // The qualification keeps the category of the inner expression, unless the
4306 // target type isn't a reference.
4307 ExprValueKind VK =
4308 ToType->isReferenceType() ? From->getValueKind() : VK_RValue;
4309
4310 CastKind CK = CK_NoOp;
4311
4312 if (ToType->isReferenceType() &&
4313 ToType->getPointeeType().getAddressSpace() !=
4314 From->getType().getAddressSpace())
4315 CK = CK_AddressSpaceConversion;
4316
4317 if (ToType->isPointerType() &&
4318 ToType->getPointeeType().getAddressSpace() !=
4319 From->getType()->getPointeeType().getAddressSpace())
4320 CK = CK_AddressSpaceConversion;
4321
4322 From = ImpCastExprToType(From, ToType.getNonLValueExprType(Context), CK, VK,
4323 /*BasePath=*/nullptr, CCK)
4324 .get();
4325
4326 if (SCS.DeprecatedStringLiteralToCharPtr &&
4327 !getLangOpts().WritableStrings) {
4328 Diag(From->getBeginLoc(),
4329 getLangOpts().CPlusPlus11
4330 ? diag::ext_deprecated_string_literal_conversion
4331 : diag::warn_deprecated_string_literal_conversion)
4332 << ToType.getNonReferenceType();
4333 }
4334
4335 break;
4336 }
4337
4338 default:
4339 llvm_unreachable("Improper third standard conversion")::llvm::llvm_unreachable_internal("Improper third standard conversion"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 4339)
;
4340 }
4341
4342 // If this conversion sequence involved a scalar -> atomic conversion, perform
4343 // that conversion now.
4344 if (!ToAtomicType.isNull()) {
4345 assert(Context.hasSameType(((Context.hasSameType( ToAtomicType->castAs<AtomicType>
()->getValueType(), From->getType())) ? static_cast<
void> (0) : __assert_fail ("Context.hasSameType( ToAtomicType->castAs<AtomicType>()->getValueType(), From->getType())"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 4346, __PRETTY_FUNCTION__))
4346 ToAtomicType->castAs<AtomicType>()->getValueType(), From->getType()))((Context.hasSameType( ToAtomicType->castAs<AtomicType>
()->getValueType(), From->getType())) ? static_cast<
void> (0) : __assert_fail ("Context.hasSameType( ToAtomicType->castAs<AtomicType>()->getValueType(), From->getType())"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 4346, __PRETTY_FUNCTION__))
;
4347 From = ImpCastExprToType(From, ToAtomicType, CK_NonAtomicToAtomic,
4348 VK_RValue, nullptr, CCK).get();
4349 }
4350
4351 // If this conversion sequence succeeded and involved implicitly converting a
4352 // _Nullable type to a _Nonnull one, complain.
4353 if (!isCast(CCK))
4354 diagnoseNullableToNonnullConversion(ToType, InitialFromType,
4355 From->getBeginLoc());
4356
4357 return From;
4358}
4359
4360/// Check the completeness of a type in a unary type trait.
4361///
4362/// If the particular type trait requires a complete type, tries to complete
4363/// it. If completing the type fails, a diagnostic is emitted and false
4364/// returned. If completing the type succeeds or no completion was required,
4365/// returns true.
4366static bool CheckUnaryTypeTraitTypeCompleteness(Sema &S, TypeTrait UTT,
4367 SourceLocation Loc,
4368 QualType ArgTy) {
4369 // C++0x [meta.unary.prop]p3:
4370 // For all of the class templates X declared in this Clause, instantiating
4371 // that template with a template argument that is a class template
4372 // specialization may result in the implicit instantiation of the template
4373 // argument if and only if the semantics of X require that the argument
4374 // must be a complete type.
4375 // We apply this rule to all the type trait expressions used to implement
4376 // these class templates. We also try to follow any GCC documented behavior
4377 // in these expressions to ensure portability of standard libraries.
4378 switch (UTT) {
4379 default: llvm_unreachable("not a UTT")::llvm::llvm_unreachable_internal("not a UTT", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 4379)
;
4380 // is_complete_type somewhat obviously cannot require a complete type.
4381 case UTT_IsCompleteType:
4382 // Fall-through
4383
4384 // These traits are modeled on the type predicates in C++0x
4385 // [meta.unary.cat] and [meta.unary.comp]. They are not specified as
4386 // requiring a complete type, as whether or not they return true cannot be
4387 // impacted by the completeness of the type.
4388 case UTT_IsVoid:
4389 case UTT_IsIntegral:
4390 case UTT_IsFloatingPoint:
4391 case UTT_IsArray:
4392 case UTT_IsPointer:
4393 case UTT_IsLvalueReference:
4394 case UTT_IsRvalueReference:
4395 case UTT_IsMemberFunctionPointer:
4396 case UTT_IsMemberObjectPointer:
4397 case UTT_IsEnum:
4398 case UTT_IsUnion:
4399 case UTT_IsClass:
4400 case UTT_IsFunction:
4401 case UTT_IsReference:
4402 case UTT_IsArithmetic:
4403 case UTT_IsFundamental:
4404 case UTT_IsObject:
4405 case UTT_IsScalar:
4406 case UTT_IsCompound:
4407 case UTT_IsMemberPointer:
4408 // Fall-through
4409
4410 // These traits are modeled on type predicates in C++0x [meta.unary.prop]
4411 // which requires some of its traits to have the complete type. However,
4412 // the completeness of the type cannot impact these traits' semantics, and
4413 // so they don't require it. This matches the comments on these traits in
4414 // Table 49.
4415 case UTT_IsConst:
4416 case UTT_IsVolatile:
4417 case UTT_IsSigned:
4418 case UTT_IsUnsigned:
4419
4420 // This type trait always returns false, checking the type is moot.
4421 case UTT_IsInterfaceClass:
4422 return true;
4423
4424 // C++14 [meta.unary.prop]:
4425 // If T is a non-union class type, T shall be a complete type.
4426 case UTT_IsEmpty:
4427 case UTT_IsPolymorphic:
4428 case UTT_IsAbstract:
4429 if (const auto *RD = ArgTy->getAsCXXRecordDecl())
4430 if (!RD->isUnion())
4431 return !S.RequireCompleteType(
4432 Loc, ArgTy, diag::err_incomplete_type_used_in_type_trait_expr);
4433 return true;
4434
4435 // C++14 [meta.unary.prop]:
4436 // If T is a class type, T shall be a complete type.
4437 case UTT_IsFinal:
4438 case UTT_IsSealed:
4439 if (ArgTy->getAsCXXRecordDecl())
4440 return !S.RequireCompleteType(
4441 Loc, ArgTy, diag::err_incomplete_type_used_in_type_trait_expr);
4442 return true;
4443
4444 // C++1z [meta.unary.prop]:
4445 // remove_all_extents_t<T> shall be a complete type or cv void.
4446 case UTT_IsAggregate:
4447 case UTT_IsTrivial:
4448 case UTT_IsTriviallyCopyable:
4449 case UTT_IsStandardLayout:
4450 case UTT_IsPOD:
4451 case UTT_IsLiteral:
4452 // Per the GCC type traits documentation, T shall be a complete type, cv void,
4453 // or an array of unknown bound. But GCC actually imposes the same constraints
4454 // as above.
4455 case UTT_HasNothrowAssign:
4456 case UTT_HasNothrowMoveAssign:
4457 case UTT_HasNothrowConstructor:
4458 case UTT_HasNothrowCopy:
4459 case UTT_HasTrivialAssign:
4460 case UTT_HasTrivialMoveAssign:
4461 case UTT_HasTrivialDefaultConstructor:
4462 case UTT_HasTrivialMoveConstructor:
4463 case UTT_HasTrivialCopy:
4464 case UTT_HasTrivialDestructor:
4465 case UTT_HasVirtualDestructor:
4466 ArgTy = QualType(ArgTy->getBaseElementTypeUnsafe(), 0);
4467 LLVM_FALLTHROUGH[[gnu::fallthrough]];
4468
4469 // C++1z [meta.unary.prop]:
4470 // T shall be a complete type, cv void, or an array of unknown bound.
4471 case UTT_IsDestructible:
4472 case UTT_IsNothrowDestructible:
4473 case UTT_IsTriviallyDestructible:
4474 case UTT_HasUniqueObjectRepresentations:
4475 if (ArgTy->isIncompleteArrayType() || ArgTy->isVoidType())
4476 return true;
4477
4478 return !S.RequireCompleteType(
4479 Loc, ArgTy, diag::err_incomplete_type_used_in_type_trait_expr);
4480 }
4481}
4482
4483static bool HasNoThrowOperator(const RecordType *RT, OverloadedOperatorKind Op,
4484 Sema &Self, SourceLocation KeyLoc, ASTContext &C,
4485 bool (CXXRecordDecl::*HasTrivial)() const,
4486 bool (CXXRecordDecl::*HasNonTrivial)() const,
4487 bool (CXXMethodDecl::*IsDesiredOp)() const)
4488{
4489 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
4490 if ((RD->*HasTrivial)() && !(RD->*HasNonTrivial)())
4491 return true;
4492
4493 DeclarationName Name = C.DeclarationNames.getCXXOperatorName(Op);
4494 DeclarationNameInfo NameInfo(Name, KeyLoc);
4495 LookupResult Res(Self, NameInfo, Sema::LookupOrdinaryName);
4496 if (Self.LookupQualifiedName(Res, RD)) {
4497 bool FoundOperator = false;
4498 Res.suppressDiagnostics();
4499 for (LookupResult::iterator Op = Res.begin(), OpEnd = Res.end();
4500 Op != OpEnd; ++Op) {
4501 if (isa<FunctionTemplateDecl>(*Op))
4502 continue;
4503
4504 CXXMethodDecl *Operator = cast<CXXMethodDecl>(*Op);
4505 if((Operator->*IsDesiredOp)()) {
4506 FoundOperator = true;
4507 const FunctionProtoType *CPT =
4508 Operator->getType()->getAs<FunctionProtoType>();
4509 CPT = Self.ResolveExceptionSpec(KeyLoc, CPT);
4510 if (!CPT || !CPT->isNothrow())
4511 return false;
4512 }
4513 }
4514 return FoundOperator;
4515 }
4516 return false;
4517}
4518
4519static bool EvaluateUnaryTypeTrait(Sema &Self, TypeTrait UTT,
4520 SourceLocation KeyLoc, QualType T) {
4521 assert(!T->isDependentType() && "Cannot evaluate traits of dependent type")((!T->isDependentType() && "Cannot evaluate traits of dependent type"
) ? static_cast<void> (0) : __assert_fail ("!T->isDependentType() && \"Cannot evaluate traits of dependent type\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 4521, __PRETTY_FUNCTION__))
;
4522
4523 ASTContext &C = Self.Context;
4524 switch(UTT) {
4525 default: llvm_unreachable("not a UTT")::llvm::llvm_unreachable_internal("not a UTT", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 4525)
;
4526 // Type trait expressions corresponding to the primary type category
4527 // predicates in C++0x [meta.unary.cat].
4528 case UTT_IsVoid:
4529 return T->isVoidType();
4530 case UTT_IsIntegral:
4531 return T->isIntegralType(C);
4532 case UTT_IsFloatingPoint:
4533 return T->isFloatingType();
4534 case UTT_IsArray:
4535 return T->isArrayType();
4536 case UTT_IsPointer:
4537 return T->isPointerType();
4538 case UTT_IsLvalueReference:
4539 return T->isLValueReferenceType();
4540 case UTT_IsRvalueReference:
4541 return T->isRValueReferenceType();
4542 case UTT_IsMemberFunctionPointer:
4543 return T->isMemberFunctionPointerType();
4544 case UTT_IsMemberObjectPointer:
4545 return T->isMemberDataPointerType();
4546 case UTT_IsEnum:
4547 return T->isEnumeralType();
4548 case UTT_IsUnion:
4549 return T->isUnionType();
4550 case UTT_IsClass:
4551 return T->isClassType() || T->isStructureType() || T->isInterfaceType();
4552 case UTT_IsFunction:
4553 return T->isFunctionType();
4554
4555 // Type trait expressions which correspond to the convenient composition
4556 // predicates in C++0x [meta.unary.comp].
4557 case UTT_IsReference:
4558 return T->isReferenceType();
4559 case UTT_IsArithmetic:
4560 return T->isArithmeticType() && !T->isEnumeralType();
4561 case UTT_IsFundamental:
4562 return T->isFundamentalType();
4563 case UTT_IsObject:
4564 return T->isObjectType();
4565 case UTT_IsScalar:
4566 // Note: semantic analysis depends on Objective-C lifetime types to be
4567 // considered scalar types. However, such types do not actually behave
4568 // like scalar types at run time (since they may require retain/release
4569 // operations), so we report them as non-scalar.
4570 if (T->isObjCLifetimeType()) {
4571 switch (T.getObjCLifetime()) {
4572 case Qualifiers::OCL_None:
4573 case Qualifiers::OCL_ExplicitNone:
4574 return true;
4575
4576 case Qualifiers::OCL_Strong:
4577 case Qualifiers::OCL_Weak:
4578 case Qualifiers::OCL_Autoreleasing:
4579 return false;
4580 }
4581 }
4582
4583 return T->isScalarType();
4584 case UTT_IsCompound:
4585 return T->isCompoundType();
4586 case UTT_IsMemberPointer:
4587 return T->isMemberPointerType();
4588
4589 // Type trait expressions which correspond to the type property predicates
4590 // in C++0x [meta.unary.prop].
4591 case UTT_IsConst:
4592 return T.isConstQualified();
4593 case UTT_IsVolatile:
4594 return T.isVolatileQualified();
4595 case UTT_IsTrivial:
4596 return T.isTrivialType(C);
4597 case UTT_IsTriviallyCopyable:
4598 return T.isTriviallyCopyableType(C);
4599 case UTT_IsStandardLayout:
4600 return T->isStandardLayoutType();
4601 case UTT_IsPOD:
4602 return T.isPODType(C);
4603 case UTT_IsLiteral:
4604 return T->isLiteralType(C);
4605 case UTT_IsEmpty:
4606 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
4607 return !RD->isUnion() && RD->isEmpty();
4608 return false;
4609 case UTT_IsPolymorphic:
4610 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
4611 return !RD->isUnion() && RD->isPolymorphic();
4612 return false;
4613 case UTT_IsAbstract:
4614 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
4615 return !RD->isUnion() && RD->isAbstract();
4616 return false;
4617 case UTT_IsAggregate:
4618 // Report vector extensions and complex types as aggregates because they
4619 // support aggregate initialization. GCC mirrors this behavior for vectors
4620 // but not _Complex.
4621 return T->isAggregateType() || T->isVectorType() || T->isExtVectorType() ||
4622 T->isAnyComplexType();
4623 // __is_interface_class only returns true when CL is invoked in /CLR mode and
4624 // even then only when it is used with the 'interface struct ...' syntax
4625 // Clang doesn't support /CLR which makes this type trait moot.
4626 case UTT_IsInterfaceClass:
4627 return false;
4628 case UTT_IsFinal:
4629 case UTT_IsSealed:
4630 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
4631 return RD->hasAttr<FinalAttr>();
4632 return false;
4633 case UTT_IsSigned:
4634 // Enum types should always return false.
4635 // Floating points should always return true.
4636 return !T->isEnumeralType() && (T->isFloatingType() || T->isSignedIntegerType());
4637 case UTT_IsUnsigned:
4638 return T->isUnsignedIntegerType();
4639
4640 // Type trait expressions which query classes regarding their construction,
4641 // destruction, and copying. Rather than being based directly on the
4642 // related type predicates in the standard, they are specified by both
4643 // GCC[1] and the Embarcadero C++ compiler[2], and Clang implements those
4644 // specifications.
4645 //
4646 // 1: http://gcc.gnu/.org/onlinedocs/gcc/Type-Traits.html
4647 // 2: http://docwiki.embarcadero.com/RADStudio/XE/en/Type_Trait_Functions_(C%2B%2B0x)_Index
4648 //
4649 // Note that these builtins do not behave as documented in g++: if a class
4650 // has both a trivial and a non-trivial special member of a particular kind,
4651 // they return false! For now, we emulate this behavior.
4652 // FIXME: This appears to be a g++ bug: more complex cases reveal that it
4653 // does not correctly compute triviality in the presence of multiple special
4654 // members of the same kind. Revisit this once the g++ bug is fixed.
4655 case UTT_HasTrivialDefaultConstructor:
4656 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
4657 // If __is_pod (type) is true then the trait is true, else if type is
4658 // a cv class or union type (or array thereof) with a trivial default
4659 // constructor ([class.ctor]) then the trait is true, else it is false.
4660 if (T.isPODType(C))
4661 return true;
4662 if (CXXRecordDecl *RD = C.getBaseElementType(T)->getAsCXXRecordDecl())
4663 return RD->hasTrivialDefaultConstructor() &&
4664 !RD->hasNonTrivialDefaultConstructor();
4665 return false;
4666 case UTT_HasTrivialMoveConstructor:
4667 // This trait is implemented by MSVC 2012 and needed to parse the
4668 // standard library headers. Specifically this is used as the logic
4669 // behind std::is_trivially_move_constructible (20.9.4.3).
4670 if (T.isPODType(C))
4671 return true;
4672 if (CXXRecordDecl *RD = C.getBaseElementType(T)->getAsCXXRecordDecl())
4673 return RD->hasTrivialMoveConstructor() && !RD->hasNonTrivialMoveConstructor();
4674 return false;
4675 case UTT_HasTrivialCopy:
4676 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
4677 // If __is_pod (type) is true or type is a reference type then
4678 // the trait is true, else if type is a cv class or union type
4679 // with a trivial copy constructor ([class.copy]) then the trait
4680 // is true, else it is false.
4681 if (T.isPODType(C) || T->isReferenceType())
4682 return true;
4683 if (CXXRecordDecl *RD = T->getAsCXXRecordDecl())
4684 return RD->hasTrivialCopyConstructor() &&
4685 !RD->hasNonTrivialCopyConstructor();
4686 return false;
4687 case UTT_HasTrivialMoveAssign:
4688 // This trait is implemented by MSVC 2012 and needed to parse the
4689 // standard library headers. Specifically it is used as the logic
4690 // behind std::is_trivially_move_assignable (20.9.4.3)
4691 if (T.isPODType(C))
4692 return true;
4693 if (CXXRecordDecl *RD = C.getBaseElementType(T)->getAsCXXRecordDecl())
4694 return RD->hasTrivialMoveAssignment() && !RD->hasNonTrivialMoveAssignment();
4695 return false;
4696 case UTT_HasTrivialAssign:
4697 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
4698 // If type is const qualified or is a reference type then the
4699 // trait is false. Otherwise if __is_pod (type) is true then the
4700 // trait is true, else if type is a cv class or union type with
4701 // a trivial copy assignment ([class.copy]) then the trait is
4702 // true, else it is false.
4703 // Note: the const and reference restrictions are interesting,
4704 // given that const and reference members don't prevent a class
4705 // from having a trivial copy assignment operator (but do cause
4706 // errors if the copy assignment operator is actually used, q.v.
4707 // [class.copy]p12).
4708
4709 if (T.isConstQualified())
4710 return false;
4711 if (T.isPODType(C))
4712 return true;
4713 if (CXXRecordDecl *RD = T->getAsCXXRecordDecl())
4714 return RD->hasTrivialCopyAssignment() &&
4715 !RD->hasNonTrivialCopyAssignment();
4716 return false;
4717 case UTT_IsDestructible:
4718 case UTT_IsTriviallyDestructible:
4719 case UTT_IsNothrowDestructible:
4720 // C++14 [meta.unary.prop]:
4721 // For reference types, is_destructible<T>::value is true.
4722 if (T->isReferenceType())
4723 return true;
4724
4725 // Objective-C++ ARC: autorelease types don't require destruction.
4726 if (T->isObjCLifetimeType() &&
4727 T.getObjCLifetime() == Qualifiers::OCL_Autoreleasing)
4728 return true;
4729
4730 // C++14 [meta.unary.prop]:
4731 // For incomplete types and function types, is_destructible<T>::value is
4732 // false.
4733 if (T->isIncompleteType() || T->isFunctionType())
4734 return false;
4735
4736 // A type that requires destruction (via a non-trivial destructor or ARC
4737 // lifetime semantics) is not trivially-destructible.
4738 if (UTT == UTT_IsTriviallyDestructible && T.isDestructedType())
4739 return false;
4740
4741 // C++14 [meta.unary.prop]:
4742 // For object types and given U equal to remove_all_extents_t<T>, if the
4743 // expression std::declval<U&>().~U() is well-formed when treated as an
4744 // unevaluated operand (Clause 5), then is_destructible<T>::value is true
4745 if (auto *RD = C.getBaseElementType(T)->getAsCXXRecordDecl()) {
4746 CXXDestructorDecl *Destructor = Self.LookupDestructor(RD);
4747 if (!Destructor)
4748 return false;
4749 // C++14 [dcl.fct.def.delete]p2:
4750 // A program that refers to a deleted function implicitly or
4751 // explicitly, other than to declare it, is ill-formed.
4752 if (Destructor->isDeleted())
4753 return false;
4754 if (C.getLangOpts().AccessControl && Destructor->getAccess() != AS_public)
4755 return false;
4756 if (UTT == UTT_IsNothrowDestructible) {
4757 const FunctionProtoType *CPT =
4758 Destructor->getType()->getAs<FunctionProtoType>();
4759 CPT = Self.ResolveExceptionSpec(KeyLoc, CPT);
4760 if (!CPT || !CPT->isNothrow())
4761 return false;
4762 }
4763 }
4764 return true;
4765
4766 case UTT_HasTrivialDestructor:
4767 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html
4768 // If __is_pod (type) is true or type is a reference type
4769 // then the trait is true, else if type is a cv class or union
4770 // type (or array thereof) with a trivial destructor
4771 // ([class.dtor]) then the trait is true, else it is
4772 // false.
4773 if (T.isPODType(C) || T->isReferenceType())
4774 return true;
4775
4776 // Objective-C++ ARC: autorelease types don't require destruction.
4777 if (T->isObjCLifetimeType() &&
4778 T.getObjCLifetime() == Qualifiers::OCL_Autoreleasing)
4779 return true;
4780
4781 if (CXXRecordDecl *RD = C.getBaseElementType(T)->getAsCXXRecordDecl())
4782 return RD->hasTrivialDestructor();
4783 return false;
4784 // TODO: Propagate nothrowness for implicitly declared special members.
4785 case UTT_HasNothrowAssign:
4786 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
4787 // If type is const qualified or is a reference type then the
4788 // trait is false. Otherwise if __has_trivial_assign (type)
4789 // is true then the trait is true, else if type is a cv class
4790 // or union type with copy assignment operators that are known
4791 // not to throw an exception then the trait is true, else it is
4792 // false.
4793 if (C.getBaseElementType(T).isConstQualified())
4794 return false;
4795 if (T->isReferenceType())
4796 return false;
4797 if (T.isPODType(C) || T->isObjCLifetimeType())
4798 return true;
4799
4800 if (const RecordType *RT = T->getAs<RecordType>())
4801 return HasNoThrowOperator(RT, OO_Equal, Self, KeyLoc, C,
4802 &CXXRecordDecl::hasTrivialCopyAssignment,
4803 &CXXRecordDecl::hasNonTrivialCopyAssignment,
4804 &CXXMethodDecl::isCopyAssignmentOperator);
4805 return false;
4806 case UTT_HasNothrowMoveAssign:
4807 // This trait is implemented by MSVC 2012 and needed to parse the
4808 // standard library headers. Specifically this is used as the logic
4809 // behind std::is_nothrow_move_assignable (20.9.4.3).
4810 if (T.isPODType(C))
4811 return true;
4812
4813 if (const RecordType *RT = C.getBaseElementType(T)->getAs<RecordType>())
4814 return HasNoThrowOperator(RT, OO_Equal, Self, KeyLoc, C,
4815 &CXXRecordDecl::hasTrivialMoveAssignment,
4816 &CXXRecordDecl::hasNonTrivialMoveAssignment,
4817 &CXXMethodDecl::isMoveAssignmentOperator);
4818 return false;
4819 case UTT_HasNothrowCopy:
4820 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
4821 // If __has_trivial_copy (type) is true then the trait is true, else
4822 // if type is a cv class or union type with copy constructors that are
4823 // known not to throw an exception then the trait is true, else it is
4824 // false.
4825 if (T.isPODType(C) || T->isReferenceType() || T->isObjCLifetimeType())
4826 return true;
4827 if (CXXRecordDecl *RD = T->getAsCXXRecordDecl()) {
4828 if (RD->hasTrivialCopyConstructor() &&
4829 !RD->hasNonTrivialCopyConstructor())
4830 return true;
4831
4832 bool FoundConstructor = false;
4833 unsigned FoundTQs;
4834 for (const auto *ND : Self.LookupConstructors(RD)) {
4835 // A template constructor is never a copy constructor.
4836 // FIXME: However, it may actually be selected at the actual overload
4837 // resolution point.
4838 if (isa<FunctionTemplateDecl>(ND->getUnderlyingDecl()))
4839 continue;
4840 // UsingDecl itself is not a constructor
4841 if (isa<UsingDecl>(ND))
4842 continue;
4843 auto *Constructor = cast<CXXConstructorDecl>(ND->getUnderlyingDecl());
4844 if (Constructor->isCopyConstructor(FoundTQs)) {
4845 FoundConstructor = true;
4846 const FunctionProtoType *CPT
4847 = Constructor->getType()->getAs<FunctionProtoType>();
4848 CPT = Self.ResolveExceptionSpec(KeyLoc, CPT);
4849 if (!CPT)
4850 return false;
4851 // TODO: check whether evaluating default arguments can throw.
4852 // For now, we'll be conservative and assume that they can throw.
4853 if (!CPT->isNothrow() || CPT->getNumParams() > 1)
4854 return false;
4855 }
4856 }
4857
4858 return FoundConstructor;
4859 }
4860 return false;
4861 case UTT_HasNothrowConstructor:
4862 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html
4863 // If __has_trivial_constructor (type) is true then the trait is
4864 // true, else if type is a cv class or union type (or array
4865 // thereof) with a default constructor that is known not to
4866 // throw an exception then the trait is true, else it is false.
4867 if (T.isPODType(C) || T->isObjCLifetimeType())
4868 return true;
4869 if (CXXRecordDecl *RD = C.getBaseElementType(T)->getAsCXXRecordDecl()) {
4870 if (RD->hasTrivialDefaultConstructor() &&
4871 !RD->hasNonTrivialDefaultConstructor())
4872 return true;
4873
4874 bool FoundConstructor = false;
4875 for (const auto *ND : Self.LookupConstructors(RD)) {
4876 // FIXME: In C++0x, a constructor template can be a default constructor.
4877 if (isa<FunctionTemplateDecl>(ND->getUnderlyingDecl()))
4878 continue;
4879 // UsingDecl itself is not a constructor
4880 if (isa<UsingDecl>(ND))
4881 continue;
4882 auto *Constructor = cast<CXXConstructorDecl>(ND->getUnderlyingDecl());
4883 if (Constructor->isDefaultConstructor()) {
4884 FoundConstructor = true;
4885 const FunctionProtoType *CPT
4886 = Constructor->getType()->getAs<FunctionProtoType>();
4887 CPT = Self.ResolveExceptionSpec(KeyLoc, CPT);
4888 if (!CPT)
4889 return false;
4890 // FIXME: check whether evaluating default arguments can throw.
4891 // For now, we'll be conservative and assume that they can throw.
4892 if (!CPT->isNothrow() || CPT->getNumParams() > 0)
4893 return false;
4894 }
4895 }
4896 return FoundConstructor;
4897 }
4898 return false;
4899 case UTT_HasVirtualDestructor:
4900 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
4901 // If type is a class type with a virtual destructor ([class.dtor])
4902 // then the trait is true, else it is false.
4903 if (CXXRecordDecl *RD = T->getAsCXXRecordDecl())
4904 if (CXXDestructorDecl *Destructor = Self.LookupDestructor(RD))
4905 return Destructor->isVirtual();
4906 return false;
4907
4908 // These type trait expressions are modeled on the specifications for the
4909 // Embarcadero C++0x type trait functions:
4910 // http://docwiki.embarcadero.com/RADStudio/XE/en/Type_Trait_Functions_(C%2B%2B0x)_Index
4911 case UTT_IsCompleteType:
4912 // http://docwiki.embarcadero.com/RADStudio/XE/en/Is_complete_type_(typename_T_):
4913 // Returns True if and only if T is a complete type at the point of the
4914 // function call.
4915 return !T->isIncompleteType();
4916 case UTT_HasUniqueObjectRepresentations:
4917 return C.hasUniqueObjectRepresentations(T);
4918 }
4919}
4920
4921static bool EvaluateBinaryTypeTrait(Sema &Self, TypeTrait BTT, QualType LhsT,
4922 QualType RhsT, SourceLocation KeyLoc);
4923
4924static bool evaluateTypeTrait(Sema &S, TypeTrait Kind, SourceLocation KWLoc,
4925 ArrayRef<TypeSourceInfo *> Args,
4926 SourceLocation RParenLoc) {
4927 if (Kind <= UTT_Last)
4928 return EvaluateUnaryTypeTrait(S, Kind, KWLoc, Args[0]->getType());
4929
4930 // Evaluate BTT_ReferenceBindsToTemporary alongside the IsConstructible
4931 // traits to avoid duplication.
4932 if (Kind <= BTT_Last && Kind != BTT_ReferenceBindsToTemporary)
4933 return EvaluateBinaryTypeTrait(S, Kind, Args[0]->getType(),
4934 Args[1]->getType(), RParenLoc);
4935
4936 switch (Kind) {
4937 case clang::BTT_ReferenceBindsToTemporary:
4938 case clang::TT_IsConstructible:
4939 case clang::TT_IsNothrowConstructible:
4940 case clang::TT_IsTriviallyConstructible: {
4941 // C++11 [meta.unary.prop]:
4942 // is_trivially_constructible is defined as:
4943 //
4944 // is_constructible<T, Args...>::value is true and the variable
4945 // definition for is_constructible, as defined below, is known to call
4946 // no operation that is not trivial.
4947 //
4948 // The predicate condition for a template specialization
4949 // is_constructible<T, Args...> shall be satisfied if and only if the
4950 // following variable definition would be well-formed for some invented
4951 // variable t:
4952 //
4953 // T t(create<Args>()...);
4954 assert(!Args.empty())((!Args.empty()) ? static_cast<void> (0) : __assert_fail
("!Args.empty()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 4954, __PRETTY_FUNCTION__))
;
4955
4956 // Precondition: T and all types in the parameter pack Args shall be
4957 // complete types, (possibly cv-qualified) void, or arrays of
4958 // unknown bound.
4959 for (const auto *TSI : Args) {
4960 QualType ArgTy = TSI->getType();
4961 if (ArgTy->isVoidType() || ArgTy->isIncompleteArrayType())
4962 continue;
4963
4964 if (S.RequireCompleteType(KWLoc, ArgTy,
4965 diag::err_incomplete_type_used_in_type_trait_expr))
4966 return false;
4967 }
4968
4969 // Make sure the first argument is not incomplete nor a function type.
4970 QualType T = Args[0]->getType();
4971 if (T->isIncompleteType() || T->isFunctionType())
4972 return false;
4973
4974 // Make sure the first argument is not an abstract type.
4975 CXXRecordDecl *RD = T->getAsCXXRecordDecl();
4976 if (RD && RD->isAbstract())
4977 return false;
4978
4979 SmallVector<OpaqueValueExpr, 2> OpaqueArgExprs;
4980 SmallVector<Expr *, 2> ArgExprs;
4981 ArgExprs.reserve(Args.size() - 1);
4982 for (unsigned I = 1, N = Args.size(); I != N; ++I) {
4983 QualType ArgTy = Args[I]->getType();
4984 if (ArgTy->isObjectType() || ArgTy->isFunctionType())
4985 ArgTy = S.Context.getRValueReferenceType(ArgTy);
4986 OpaqueArgExprs.push_back(
4987 OpaqueValueExpr(Args[I]->getTypeLoc().getBeginLoc(),
4988 ArgTy.getNonLValueExprType(S.Context),
4989 Expr::getValueKindForType(ArgTy)));
4990 }
4991 for (Expr &E : OpaqueArgExprs)
4992 ArgExprs.push_back(&E);
4993
4994 // Perform the initialization in an unevaluated context within a SFINAE
4995 // trap at translation unit scope.
4996 EnterExpressionEvaluationContext Unevaluated(
4997 S, Sema::ExpressionEvaluationContext::Unevaluated);
4998 Sema::SFINAETrap SFINAE(S, /*AccessCheckingSFINAE=*/true);
4999 Sema::ContextRAII TUContext(S, S.Context.getTranslationUnitDecl());
5000 InitializedEntity To(InitializedEntity::InitializeTemporary(Args[0]));
5001 InitializationKind InitKind(InitializationKind::CreateDirect(KWLoc, KWLoc,
5002 RParenLoc));
5003 InitializationSequence Init(S, To, InitKind, ArgExprs);
5004 if (Init.Failed())
5005 return false;
5006
5007 ExprResult Result = Init.Perform(S, To, InitKind, ArgExprs);
5008 if (Result.isInvalid() || SFINAE.hasErrorOccurred())
5009 return false;
5010
5011 if (Kind == clang::TT_IsConstructible)
5012 return true;
5013
5014 if (Kind == clang::BTT_ReferenceBindsToTemporary) {
5015 if (!T->isReferenceType())
5016 return false;
5017
5018 return !Init.isDirectReferenceBinding();
5019 }
5020
5021 if (Kind == clang::TT_IsNothrowConstructible)
5022 return S.canThrow(Result.get()) == CT_Cannot;
5023
5024 if (Kind == clang::TT_IsTriviallyConstructible) {
5025 // Under Objective-C ARC and Weak, if the destination has non-trivial
5026 // Objective-C lifetime, this is a non-trivial construction.
5027 if (T.getNonReferenceType().hasNonTrivialObjCLifetime())
5028 return false;
5029
5030 // The initialization succeeded; now make sure there are no non-trivial
5031 // calls.
5032 return !Result.get()->hasNonTrivialCall(S.Context);
5033 }
5034
5035 llvm_unreachable("unhandled type trait")::llvm::llvm_unreachable_internal("unhandled type trait", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 5035)
;
5036 return false;
5037 }
5038 default: llvm_unreachable("not a TT")::llvm::llvm_unreachable_internal("not a TT", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 5038)
;
5039 }
5040
5041 return false;
5042}
5043
5044ExprResult Sema::BuildTypeTrait(TypeTrait Kind, SourceLocation KWLoc,
5045 ArrayRef<TypeSourceInfo *> Args,
5046 SourceLocation RParenLoc) {
5047 QualType ResultType = Context.getLogicalOperationType();
5048
5049 if (Kind <= UTT_Last && !CheckUnaryTypeTraitTypeCompleteness(
5050 *this, Kind, KWLoc, Args[0]->getType()))
5051 return ExprError();
5052
5053 bool Dependent = false;
5054 for (unsigned I = 0, N = Args.size(); I != N; ++I) {
5055 if (Args[I]->getType()->isDependentType()) {
5056 Dependent = true;
5057 break;
5058 }
5059 }
5060
5061 bool Result = false;
5062 if (!Dependent)
5063 Result = evaluateTypeTrait(*this, Kind, KWLoc, Args, RParenLoc);
5064
5065 return TypeTraitExpr::Create(Context, ResultType, KWLoc, Kind, Args,
5066 RParenLoc, Result);
5067}
5068
5069ExprResult Sema::ActOnTypeTrait(TypeTrait Kind, SourceLocation KWLoc,
5070 ArrayRef<ParsedType> Args,
5071 SourceLocation RParenLoc) {
5072 SmallVector<TypeSourceInfo *, 4> ConvertedArgs;
5073 ConvertedArgs.reserve(Args.size());
5074
5075 for (unsigned I = 0, N = Args.size(); I != N; ++I) {
5076 TypeSourceInfo *TInfo;
5077 QualType T = GetTypeFromParser(Args[I], &TInfo);
5078 if (!TInfo)
5079 TInfo = Context.getTrivialTypeSourceInfo(T, KWLoc);
5080
5081 ConvertedArgs.push_back(TInfo);
5082 }
5083
5084 return BuildTypeTrait(Kind, KWLoc, ConvertedArgs, RParenLoc);
5085}
5086
5087static bool EvaluateBinaryTypeTrait(Sema &Self, TypeTrait BTT, QualType LhsT,
5088 QualType RhsT, SourceLocation KeyLoc) {
5089 assert(!LhsT->isDependentType() && !RhsT->isDependentType() &&((!LhsT->isDependentType() && !RhsT->isDependentType
() && "Cannot evaluate traits of dependent types") ? static_cast
<void> (0) : __assert_fail ("!LhsT->isDependentType() && !RhsT->isDependentType() && \"Cannot evaluate traits of dependent types\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 5090, __PRETTY_FUNCTION__))
5090 "Cannot evaluate traits of dependent types")((!LhsT->isDependentType() && !RhsT->isDependentType
() && "Cannot evaluate traits of dependent types") ? static_cast
<void> (0) : __assert_fail ("!LhsT->isDependentType() && !RhsT->isDependentType() && \"Cannot evaluate traits of dependent types\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 5090, __PRETTY_FUNCTION__))
;
5091
5092 switch(BTT) {
5093 case BTT_IsBaseOf: {
5094 // C++0x [meta.rel]p2
5095 // Base is a base class of Derived without regard to cv-qualifiers or
5096 // Base and Derived are not unions and name the same class type without
5097 // regard to cv-qualifiers.
5098
5099 const RecordType *lhsRecord = LhsT->getAs<RecordType>();
5100 const RecordType *rhsRecord = RhsT->getAs<RecordType>();
5101 if (!rhsRecord || !lhsRecord) {
5102 const ObjCObjectType *LHSObjTy = LhsT->getAs<ObjCObjectType>();
5103 const ObjCObjectType *RHSObjTy = RhsT->getAs<ObjCObjectType>();
5104 if (!LHSObjTy || !RHSObjTy)
5105 return false;
5106
5107 ObjCInterfaceDecl *BaseInterface = LHSObjTy->getInterface();
5108 ObjCInterfaceDecl *DerivedInterface = RHSObjTy->getInterface();
5109 if (!BaseInterface || !DerivedInterface)
5110 return false;
5111
5112 if (Self.RequireCompleteType(
5113 KeyLoc, RhsT, diag::err_incomplete_type_used_in_type_trait_expr))
5114 return false;
5115
5116 return BaseInterface->isSuperClassOf(DerivedInterface);
5117 }
5118
5119 assert(Self.Context.hasSameUnqualifiedType(LhsT, RhsT)((Self.Context.hasSameUnqualifiedType(LhsT, RhsT) == (lhsRecord
== rhsRecord)) ? static_cast<void> (0) : __assert_fail
("Self.Context.hasSameUnqualifiedType(LhsT, RhsT) == (lhsRecord == rhsRecord)"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 5120, __PRETTY_FUNCTION__))
5120 == (lhsRecord == rhsRecord))((Self.Context.hasSameUnqualifiedType(LhsT, RhsT) == (lhsRecord
== rhsRecord)) ? static_cast<void> (0) : __assert_fail
("Self.Context.hasSameUnqualifiedType(LhsT, RhsT) == (lhsRecord == rhsRecord)"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 5120, __PRETTY_FUNCTION__))
;
5121
5122 // Unions are never base classes, and never have base classes.
5123 // It doesn't matter if they are complete or not. See PR#41843
5124 if (lhsRecord && lhsRecord->getDecl()->isUnion())
5125 return false;
5126 if (rhsRecord && rhsRecord->getDecl()->isUnion())
5127 return false;
5128
5129 if (lhsRecord == rhsRecord)
5130 return true;
5131
5132 // C++0x [meta.rel]p2:
5133 // If Base and Derived are class types and are different types
5134 // (ignoring possible cv-qualifiers) then Derived shall be a
5135 // complete type.
5136 if (Self.RequireCompleteType(KeyLoc, RhsT,
5137 diag::err_incomplete_type_used_in_type_trait_expr))
5138 return false;
5139
5140 return cast<CXXRecordDecl>(rhsRecord->getDecl())
5141 ->isDerivedFrom(cast<CXXRecordDecl>(lhsRecord->getDecl()));
5142 }
5143 case BTT_IsSame:
5144 return Self.Context.hasSameType(LhsT, RhsT);
5145 case BTT_TypeCompatible: {
5146 // GCC ignores cv-qualifiers on arrays for this builtin.
5147 Qualifiers LhsQuals, RhsQuals;
5148 QualType Lhs = Self.getASTContext().getUnqualifiedArrayType(LhsT, LhsQuals);
5149 QualType Rhs = Self.getASTContext().getUnqualifiedArrayType(RhsT, RhsQuals);
5150 return Self.Context.typesAreCompatible(Lhs, Rhs);
5151 }
5152 case BTT_IsConvertible:
5153 case BTT_IsConvertibleTo: {
5154 // C++0x [meta.rel]p4:
5155 // Given the following function prototype:
5156 //
5157 // template <class T>
5158 // typename add_rvalue_reference<T>::type create();
5159 //
5160 // the predicate condition for a template specialization
5161 // is_convertible<From, To> shall be satisfied if and only if
5162 // the return expression in the following code would be
5163 // well-formed, including any implicit conversions to the return
5164 // type of the function:
5165 //
5166 // To test() {
5167 // return create<From>();
5168 // }
5169 //
5170 // Access checking is performed as if in a context unrelated to To and
5171 // From. Only the validity of the immediate context of the expression
5172 // of the return-statement (including conversions to the return type)
5173 // is considered.
5174 //
5175 // We model the initialization as a copy-initialization of a temporary
5176 // of the appropriate type, which for this expression is identical to the
5177 // return statement (since NRVO doesn't apply).
5178
5179 // Functions aren't allowed to return function or array types.
5180 if (RhsT->isFunctionType() || RhsT->isArrayType())
5181 return false;
5182
5183 // A return statement in a void function must have void type.
5184 if (RhsT->isVoidType())
5185 return LhsT->isVoidType();
5186
5187 // A function definition requires a complete, non-abstract return type.
5188 if (!Self.isCompleteType(KeyLoc, RhsT) || Self.isAbstractType(KeyLoc, RhsT))
5189 return false;
5190
5191 // Compute the result of add_rvalue_reference.
5192 if (LhsT->isObjectType() || LhsT->isFunctionType())
5193 LhsT = Self.Context.getRValueReferenceType(LhsT);
5194
5195 // Build a fake source and destination for initialization.
5196 InitializedEntity To(InitializedEntity::InitializeTemporary(RhsT));
5197 OpaqueValueExpr From(KeyLoc, LhsT.getNonLValueExprType(Self.Context),
5198 Expr::getValueKindForType(LhsT));
5199 Expr *FromPtr = &From;
5200 InitializationKind Kind(InitializationKind::CreateCopy(KeyLoc,
5201 SourceLocation()));
5202
5203 // Perform the initialization in an unevaluated context within a SFINAE
5204 // trap at translation unit scope.
5205 EnterExpressionEvaluationContext Unevaluated(
5206 Self, Sema::ExpressionEvaluationContext::Unevaluated);
5207 Sema::SFINAETrap SFINAE(Self, /*AccessCheckingSFINAE=*/true);
5208 Sema::ContextRAII TUContext(Self, Self.Context.getTranslationUnitDecl());
5209 InitializationSequence Init(Self, To, Kind, FromPtr);
5210 if (Init.Failed())
5211 return false;
5212
5213 ExprResult Result = Init.Perform(Self, To, Kind, FromPtr);
5214 return !Result.isInvalid() && !SFINAE.hasErrorOccurred();
5215 }
5216
5217 case BTT_IsAssignable:
5218 case BTT_IsNothrowAssignable:
5219 case BTT_IsTriviallyAssignable: {
5220 // C++11 [meta.unary.prop]p3:
5221 // is_trivially_assignable is defined as:
5222 // is_assignable<T, U>::value is true and the assignment, as defined by
5223 // is_assignable, is known to call no operation that is not trivial
5224 //
5225 // is_assignable is defined as:
5226 // The expression declval<T>() = declval<U>() is well-formed when
5227 // treated as an unevaluated operand (Clause 5).
5228 //
5229 // For both, T and U shall be complete types, (possibly cv-qualified)
5230 // void, or arrays of unknown bound.
5231 if (!LhsT->isVoidType() && !LhsT->isIncompleteArrayType() &&
5232 Self.RequireCompleteType(KeyLoc, LhsT,
5233 diag::err_incomplete_type_used_in_type_trait_expr))
5234 return false;
5235 if (!RhsT->isVoidType() && !RhsT->isIncompleteArrayType() &&
5236 Self.RequireCompleteType(KeyLoc, RhsT,
5237 diag::err_incomplete_type_used_in_type_trait_expr))
5238 return false;
5239
5240 // cv void is never assignable.
5241 if (LhsT->isVoidType() || RhsT->isVoidType())
5242 return false;
5243
5244 // Build expressions that emulate the effect of declval<T>() and
5245 // declval<U>().
5246 if (LhsT->isObjectType() || LhsT->isFunctionType())
5247 LhsT = Self.Context.getRValueReferenceType(LhsT);
5248 if (RhsT->isObjectType() || RhsT->isFunctionType())
5249 RhsT = Self.Context.getRValueReferenceType(RhsT);
5250 OpaqueValueExpr Lhs(KeyLoc, LhsT.getNonLValueExprType(Self.Context),
5251 Expr::getValueKindForType(LhsT));
5252 OpaqueValueExpr Rhs(KeyLoc, RhsT.getNonLValueExprType(Self.Context),
5253 Expr::getValueKindForType(RhsT));
5254
5255 // Attempt the assignment in an unevaluated context within a SFINAE
5256 // trap at translation unit scope.
5257 EnterExpressionEvaluationContext Unevaluated(
5258 Self, Sema::ExpressionEvaluationContext::Unevaluated);
5259 Sema::SFINAETrap SFINAE(Self, /*AccessCheckingSFINAE=*/true);
5260 Sema::ContextRAII TUContext(Self, Self.Context.getTranslationUnitDecl());
5261 ExprResult Result = Self.BuildBinOp(/*S=*/nullptr, KeyLoc, BO_Assign, &Lhs,
5262 &Rhs);
5263 if (Result.isInvalid())
5264 return false;
5265
5266 // Treat the assignment as unused for the purpose of -Wdeprecated-volatile.
5267 Self.CheckUnusedVolatileAssignment(Result.get());
5268
5269 if (SFINAE.hasErrorOccurred())
5270 return false;
5271
5272 if (BTT == BTT_IsAssignable)
5273 return true;
5274
5275 if (BTT == BTT_IsNothrowAssignable)
5276 return Self.canThrow(Result.get()) == CT_Cannot;
5277
5278 if (BTT == BTT_IsTriviallyAssignable) {
5279 // Under Objective-C ARC and Weak, if the destination has non-trivial
5280 // Objective-C lifetime, this is a non-trivial assignment.
5281 if (LhsT.getNonReferenceType().hasNonTrivialObjCLifetime())
5282 return false;
5283
5284 return !Result.get()->hasNonTrivialCall(Self.Context);
5285 }
5286
5287 llvm_unreachable("unhandled type trait")::llvm::llvm_unreachable_internal("unhandled type trait", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 5287)
;
5288 return false;
5289 }
5290 default: llvm_unreachable("not a BTT")::llvm::llvm_unreachable_internal("not a BTT", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 5290)
;
5291 }
5292 llvm_unreachable("Unknown type trait or not implemented")::llvm::llvm_unreachable_internal("Unknown type trait or not implemented"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 5292)
;
5293}
5294
5295ExprResult Sema::ActOnArrayTypeTrait(ArrayTypeTrait ATT,
5296 SourceLocation KWLoc,
5297 ParsedType Ty,
5298 Expr* DimExpr,
5299 SourceLocation RParen) {
5300 TypeSourceInfo *TSInfo;
5301 QualType T = GetTypeFromParser(Ty, &TSInfo);
5302 if (!TSInfo)
5303 TSInfo = Context.getTrivialTypeSourceInfo(T);
5304
5305 return BuildArrayTypeTrait(ATT, KWLoc, TSInfo, DimExpr, RParen);
5306}
5307
5308static uint64_t EvaluateArrayTypeTrait(Sema &Self, ArrayTypeTrait ATT,
5309 QualType T, Expr *DimExpr,
5310 SourceLocation KeyLoc) {
5311 assert(!T->isDependentType() && "Cannot evaluate traits of dependent type")((!T->isDependentType() && "Cannot evaluate traits of dependent type"
) ? static_cast<void> (0) : __assert_fail ("!T->isDependentType() && \"Cannot evaluate traits of dependent type\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 5311, __PRETTY_FUNCTION__))
;
5312
5313 switch(ATT) {
5314 case ATT_ArrayRank:
5315 if (T->isArrayType()) {
5316 unsigned Dim = 0;
5317 while (const ArrayType *AT = Self.Context.getAsArrayType(T)) {
5318 ++Dim;
5319 T = AT->getElementType();
5320 }
5321 return Dim;
5322 }
5323 return 0;
5324
5325 case ATT_ArrayExtent: {
5326 llvm::APSInt Value;
5327 uint64_t Dim;
5328 if (Self.VerifyIntegerConstantExpression(DimExpr, &Value,
5329 diag::err_dimension_expr_not_constant_integer,
5330 false).isInvalid())
5331 return 0;
5332 if (Value.isSigned() && Value.isNegative()) {
5333 Self.Diag(KeyLoc, diag::err_dimension_expr_not_constant_integer)
5334 << DimExpr->getSourceRange();
5335 return 0;
5336 }
5337 Dim = Value.getLimitedValue();
5338
5339 if (T->isArrayType()) {
5340 unsigned D = 0;
5341 bool Matched = false;
5342 while (const ArrayType *AT = Self.Context.getAsArrayType(T)) {
5343 if (Dim == D) {
5344 Matched = true;
5345 break;
5346 }
5347 ++D;
5348 T = AT->getElementType();
5349 }
5350
5351 if (Matched && T->isArrayType()) {
5352 if (const ConstantArrayType *CAT = Self.Context.getAsConstantArrayType(T))
5353 return CAT->getSize().getLimitedValue();
5354 }
5355 }
5356 return 0;
5357 }
5358 }
5359 llvm_unreachable("Unknown type trait or not implemented")::llvm::llvm_unreachable_internal("Unknown type trait or not implemented"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 5359)
;
5360}
5361
5362ExprResult Sema::BuildArrayTypeTrait(ArrayTypeTrait ATT,
5363 SourceLocation KWLoc,
5364 TypeSourceInfo *TSInfo,
5365 Expr* DimExpr,
5366 SourceLocation RParen) {
5367 QualType T = TSInfo->getType();
5368
5369 // FIXME: This should likely be tracked as an APInt to remove any host
5370 // assumptions about the width of size_t on the target.
5371 uint64_t Value = 0;
5372 if (!T->isDependentType())
5373 Value = EvaluateArrayTypeTrait(*this, ATT, T, DimExpr, KWLoc);
5374
5375 // While the specification for these traits from the Embarcadero C++
5376 // compiler's documentation says the return type is 'unsigned int', Clang
5377 // returns 'size_t'. On Windows, the primary platform for the Embarcadero
5378 // compiler, there is no difference. On several other platforms this is an
5379 // important distinction.
5380 return new (Context) ArrayTypeTraitExpr(KWLoc, ATT, TSInfo, Value, DimExpr,
5381 RParen, Context.getSizeType());
5382}
5383
5384ExprResult Sema::ActOnExpressionTrait(ExpressionTrait ET,
5385 SourceLocation KWLoc,
5386 Expr *Queried,
5387 SourceLocation RParen) {
5388 // If error parsing the expression, ignore.
5389 if (!Queried)
5390 return ExprError();
5391
5392 ExprResult Result = BuildExpressionTrait(ET, KWLoc, Queried, RParen);
5393
5394 return Result;
5395}
5396
5397static bool EvaluateExpressionTrait(ExpressionTrait ET, Expr *E) {
5398 switch (ET) {
5399 case ET_IsLValueExpr: return E->isLValue();
5400 case ET_IsRValueExpr: return E->isRValue();
5401 }
5402 llvm_unreachable("Expression trait not covered by switch")::llvm::llvm_unreachable_internal("Expression trait not covered by switch"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 5402)
;
5403}
5404
5405ExprResult Sema::BuildExpressionTrait(ExpressionTrait ET,
5406 SourceLocation KWLoc,
5407 Expr *Queried,
5408 SourceLocation RParen) {
5409 if (Queried->isTypeDependent()) {
5410 // Delay type-checking for type-dependent expressions.
5411 } else if (Queried->getType()->isPlaceholderType()) {
5412 ExprResult PE = CheckPlaceholderExpr(Queried);
5413 if (PE.isInvalid()) return ExprError();
5414 return BuildExpressionTrait(ET, KWLoc, PE.get(), RParen);
5415 }
5416
5417 bool Value = EvaluateExpressionTrait(ET, Queried);
5418
5419 return new (Context)
5420 ExpressionTraitExpr(KWLoc, ET, Queried, Value, RParen, Context.BoolTy);
5421}
5422
5423QualType Sema::CheckPointerToMemberOperands(ExprResult &LHS, ExprResult &RHS,
5424 ExprValueKind &VK,
5425 SourceLocation Loc,
5426 bool isIndirect) {
5427 assert(!LHS.get()->getType()->isPlaceholderType() &&((!LHS.get()->getType()->isPlaceholderType() &&
!RHS.get()->getType()->isPlaceholderType() && "placeholders should have been weeded out by now"
) ? static_cast<void> (0) : __assert_fail ("!LHS.get()->getType()->isPlaceholderType() && !RHS.get()->getType()->isPlaceholderType() && \"placeholders should have been weeded out by now\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 5429, __PRETTY_FUNCTION__))
5428 !RHS.get()->getType()->isPlaceholderType() &&((!LHS.get()->getType()->isPlaceholderType() &&
!RHS.get()->getType()->isPlaceholderType() && "placeholders should have been weeded out by now"
) ? static_cast<void> (0) : __assert_fail ("!LHS.get()->getType()->isPlaceholderType() && !RHS.get()->getType()->isPlaceholderType() && \"placeholders should have been weeded out by now\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 5429, __PRETTY_FUNCTION__))
5429 "placeholders should have been weeded out by now")((!LHS.get()->getType()->isPlaceholderType() &&
!RHS.get()->getType()->isPlaceholderType() && "placeholders should have been weeded out by now"
) ? static_cast<void> (0) : __assert_fail ("!LHS.get()->getType()->isPlaceholderType() && !RHS.get()->getType()->isPlaceholderType() && \"placeholders should have been weeded out by now\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 5429, __PRETTY_FUNCTION__))
;
5430
5431 // The LHS undergoes lvalue conversions if this is ->*, and undergoes the
5432 // temporary materialization conversion otherwise.
5433 if (isIndirect)
5434 LHS = DefaultLvalueConversion(LHS.get());
5435 else if (LHS.get()->isRValue())
5436 LHS = TemporaryMaterializationConversion(LHS.get());
5437 if (LHS.isInvalid())
5438 return QualType();
5439
5440 // The RHS always undergoes lvalue conversions.
5441 RHS = DefaultLvalueConversion(RHS.get());
5442 if (RHS.isInvalid()) return QualType();
5443
5444 const char *OpSpelling = isIndirect ? "->*" : ".*";
5445 // C++ 5.5p2
5446 // The binary operator .* [p3: ->*] binds its second operand, which shall
5447 // be of type "pointer to member of T" (where T is a completely-defined
5448 // class type) [...]
5449 QualType RHSType = RHS.get()->getType();
5450 const MemberPointerType *MemPtr = RHSType->getAs<MemberPointerType>();
5451 if (!MemPtr) {
5452 Diag(Loc, diag::err_bad_memptr_rhs)
5453 << OpSpelling << RHSType << RHS.get()->getSourceRange();
5454 return QualType();
5455 }
5456
5457 QualType Class(MemPtr->getClass(), 0);
5458
5459 // Note: C++ [expr.mptr.oper]p2-3 says that the class type into which the
5460 // member pointer points must be completely-defined. However, there is no
5461 // reason for this semantic distinction, and the rule is not enforced by
5462 // other compilers. Therefore, we do not check this property, as it is
5463 // likely to be considered a defect.
5464
5465 // C++ 5.5p2
5466 // [...] to its first operand, which shall be of class T or of a class of
5467 // which T is an unambiguous and accessible base class. [p3: a pointer to
5468 // such a class]
5469 QualType LHSType = LHS.get()->getType();
5470 if (isIndirect) {
5471 if (const PointerType *Ptr = LHSType->getAs<PointerType>())
5472 LHSType = Ptr->getPointeeType();
5473 else {
5474 Diag(Loc, diag::err_bad_memptr_lhs)
5475 << OpSpelling << 1 << LHSType
5476 << FixItHint::CreateReplacement(SourceRange(Loc), ".*");
5477 return QualType();
5478 }
5479 }
5480
5481 if (!Context.hasSameUnqualifiedType(Class, LHSType)) {
5482 // If we want to check the hierarchy, we need a complete type.
5483 if (RequireCompleteType(Loc, LHSType, diag::err_bad_memptr_lhs,
5484 OpSpelling, (int)isIndirect)) {
5485 return QualType();
5486 }
5487
5488 if (!IsDerivedFrom(Loc, LHSType, Class)) {
5489 Diag(Loc, diag::err_bad_memptr_lhs) << OpSpelling
5490 << (int)isIndirect << LHS.get()->getType();
5491 return QualType();
5492 }
5493
5494 CXXCastPath BasePath;
5495 if (CheckDerivedToBaseConversion(
5496 LHSType, Class, Loc,
5497 SourceRange(LHS.get()->getBeginLoc(), RHS.get()->getEndLoc()),
5498 &BasePath))
5499 return QualType();
5500
5501 // Cast LHS to type of use.
5502 QualType UseType = Context.getQualifiedType(Class, LHSType.getQualifiers());
5503 if (isIndirect)
5504 UseType = Context.getPointerType(UseType);
5505 ExprValueKind VK = isIndirect ? VK_RValue : LHS.get()->getValueKind();
5506 LHS = ImpCastExprToType(LHS.get(), UseType, CK_DerivedToBase, VK,
5507 &BasePath);
5508 }
5509
5510 if (isa<CXXScalarValueInitExpr>(RHS.get()->IgnoreParens())) {
5511 // Diagnose use of pointer-to-member type which when used as
5512 // the functional cast in a pointer-to-member expression.
5513 Diag(Loc, diag::err_pointer_to_member_type) << isIndirect;
5514 return QualType();
5515 }
5516
5517 // C++ 5.5p2
5518 // The result is an object or a function of the type specified by the
5519 // second operand.
5520 // The cv qualifiers are the union of those in the pointer and the left side,
5521 // in accordance with 5.5p5 and 5.2.5.
5522 QualType Result = MemPtr->getPointeeType();
5523 Result = Context.getCVRQualifiedType(Result, LHSType.getCVRQualifiers());
5524
5525 // C++0x [expr.mptr.oper]p6:
5526 // In a .* expression whose object expression is an rvalue, the program is
5527 // ill-formed if the second operand is a pointer to member function with
5528 // ref-qualifier &. In a ->* expression or in a .* expression whose object
5529 // expression is an lvalue, the program is ill-formed if the second operand
5530 // is a pointer to member function with ref-qualifier &&.
5531 if (const FunctionProtoType *Proto = Result->getAs<FunctionProtoType>()) {
5532 switch (Proto->getRefQualifier()) {
5533 case RQ_None:
5534 // Do nothing
5535 break;
5536
5537 case RQ_LValue:
5538 if (!isIndirect && !LHS.get()->Classify(Context).isLValue()) {
5539 // C++2a allows functions with ref-qualifier & if their cv-qualifier-seq
5540 // is (exactly) 'const'.
5541 if (Proto->isConst() && !Proto->isVolatile())
5542 Diag(Loc, getLangOpts().CPlusPlus2a
5543 ? diag::warn_cxx17_compat_pointer_to_const_ref_member_on_rvalue
5544 : diag::ext_pointer_to_const_ref_member_on_rvalue);
5545 else
5546 Diag(Loc, diag::err_pointer_to_member_oper_value_classify)
5547 << RHSType << 1 << LHS.get()->getSourceRange();
5548 }
5549 break;
5550
5551 case RQ_RValue:
5552 if (isIndirect || !LHS.get()->Classify(Context).isRValue())
5553 Diag(Loc, diag::err_pointer_to_member_oper_value_classify)
5554 << RHSType << 0 << LHS.get()->getSourceRange();
5555 break;
5556 }
5557 }
5558
5559 // C++ [expr.mptr.oper]p6:
5560 // The result of a .* expression whose second operand is a pointer
5561 // to a data member is of the same value category as its
5562 // first operand. The result of a .* expression whose second
5563 // operand is a pointer to a member function is a prvalue. The
5564 // result of an ->* expression is an lvalue if its second operand
5565 // is a pointer to data member and a prvalue otherwise.
5566 if (Result->isFunctionType()) {
5567 VK = VK_RValue;
5568 return Context.BoundMemberTy;
5569 } else if (isIndirect) {
5570 VK = VK_LValue;
5571 } else {
5572 VK = LHS.get()->getValueKind();
5573 }
5574
5575 return Result;
5576}
5577
5578/// Try to convert a type to another according to C++11 5.16p3.
5579///
5580/// This is part of the parameter validation for the ? operator. If either
5581/// value operand is a class type, the two operands are attempted to be
5582/// converted to each other. This function does the conversion in one direction.
5583/// It returns true if the program is ill-formed and has already been diagnosed
5584/// as such.
5585static bool TryClassUnification(Sema &Self, Expr *From, Expr *To,
5586 SourceLocation QuestionLoc,
5587 bool &HaveConversion,
5588 QualType &ToType) {
5589 HaveConversion = false;
5590 ToType = To->getType();
5591
5592 InitializationKind Kind =
5593 InitializationKind::CreateCopy(To->getBeginLoc(), SourceLocation());
5594 // C++11 5.16p3
5595 // The process for determining whether an operand expression E1 of type T1
5596 // can be converted to match an operand expression E2 of type T2 is defined
5597 // as follows:
5598 // -- If E2 is an lvalue: E1 can be converted to match E2 if E1 can be
5599 // implicitly converted to type "lvalue reference to T2", subject to the
5600 // constraint that in the conversion the reference must bind directly to
5601 // an lvalue.
5602 // -- If E2 is an xvalue: E1 can be converted to match E2 if E1 can be
5603 // implicitly converted to the type "rvalue reference to R2", subject to
5604 // the constraint that the reference must bind directly.
5605 if (To->isLValue() || To->isXValue()) {
5606 QualType T = To->isLValue() ? Self.Context.getLValueReferenceType(ToType)
5607 : Self.Context.getRValueReferenceType(ToType);
5608
5609 InitializedEntity Entity = InitializedEntity::InitializeTemporary(T);
5610
5611 InitializationSequence InitSeq(Self, Entity, Kind, From);
5612 if (InitSeq.isDirectReferenceBinding()) {
5613 ToType = T;
5614 HaveConversion = true;
5615 return false;
5616 }
5617
5618 if (InitSeq.isAmbiguous())
5619 return InitSeq.Diagnose(Self, Entity, Kind, From);
5620 }
5621
5622 // -- If E2 is an rvalue, or if the conversion above cannot be done:
5623 // -- if E1 and E2 have class type, and the underlying class types are
5624 // the same or one is a base class of the other:
5625 QualType FTy = From->getType();
5626 QualType TTy = To->getType();
5627 const RecordType *FRec = FTy->getAs<RecordType>();
5628 const RecordType *TRec = TTy->getAs<RecordType>();
5629 bool FDerivedFromT = FRec && TRec && FRec != TRec &&
5630 Self.IsDerivedFrom(QuestionLoc, FTy, TTy);
5631 if (FRec && TRec && (FRec == TRec || FDerivedFromT ||
5632 Self.IsDerivedFrom(QuestionLoc, TTy, FTy))) {
5633 // E1 can be converted to match E2 if the class of T2 is the
5634 // same type as, or a base class of, the class of T1, and
5635 // [cv2 > cv1].
5636 if (FRec == TRec || FDerivedFromT) {
5637 if (TTy.isAtLeastAsQualifiedAs(FTy)) {
5638 InitializedEntity Entity = InitializedEntity::InitializeTemporary(TTy);
5639 InitializationSequence InitSeq(Self, Entity, Kind, From);
5640 if (InitSeq) {
5641 HaveConversion = true;
5642 return false;
5643 }
5644
5645 if (InitSeq.isAmbiguous())
5646 return InitSeq.Diagnose(Self, Entity, Kind, From);
5647 }
5648 }
5649
5650 return false;
5651 }
5652
5653 // -- Otherwise: E1 can be converted to match E2 if E1 can be
5654 // implicitly converted to the type that expression E2 would have
5655 // if E2 were converted to an rvalue (or the type it has, if E2 is
5656 // an rvalue).
5657 //
5658 // This actually refers very narrowly to the lvalue-to-rvalue conversion, not
5659 // to the array-to-pointer or function-to-pointer conversions.
5660 TTy = TTy.getNonLValueExprType(Self.Context);
5661
5662 InitializedEntity Entity = InitializedEntity::InitializeTemporary(TTy);
5663 InitializationSequence InitSeq(Self, Entity, Kind, From);
5664 HaveConversion = !InitSeq.Failed();
5665 ToType = TTy;
5666 if (InitSeq.isAmbiguous())
5667 return InitSeq.Diagnose(Self, Entity, Kind, From);
5668
5669 return false;
5670}
5671
5672/// Try to find a common type for two according to C++0x 5.16p5.
5673///
5674/// This is part of the parameter validation for the ? operator. If either
5675/// value operand is a class type, overload resolution is used to find a
5676/// conversion to a common type.
5677static bool FindConditionalOverload(Sema &Self, ExprResult &LHS, ExprResult &RHS,
5678 SourceLocation QuestionLoc) {
5679 Expr *Args[2] = { LHS.get(), RHS.get() };
5680 OverloadCandidateSet CandidateSet(QuestionLoc,
5681 OverloadCandidateSet::CSK_Operator);
5682 Self.AddBuiltinOperatorCandidates(OO_Conditional, QuestionLoc, Args,
5683 CandidateSet);
5684
5685 OverloadCandidateSet::iterator Best;
5686 switch (CandidateSet.BestViableFunction(Self, QuestionLoc, Best)) {
5687 case OR_Success: {
5688 // We found a match. Perform the conversions on the arguments and move on.
5689 ExprResult LHSRes = Self.PerformImplicitConversion(
5690 LHS.get(), Best->BuiltinParamTypes[0], Best->Conversions[0],
5691 Sema::AA_Converting);
5692 if (LHSRes.isInvalid())
5693 break;
5694 LHS = LHSRes;
5695
5696 ExprResult RHSRes = Self.PerformImplicitConversion(
5697 RHS.get(), Best->BuiltinParamTypes[1], Best->Conversions[1],
5698 Sema::AA_Converting);
5699 if (RHSRes.isInvalid())
5700 break;
5701 RHS = RHSRes;
5702 if (Best->Function)
5703 Self.MarkFunctionReferenced(QuestionLoc, Best->Function);
5704 return false;
5705 }
5706
5707 case OR_No_Viable_Function:
5708
5709 // Emit a better diagnostic if one of the expressions is a null pointer
5710 // constant and the other is a pointer type. In this case, the user most
5711 // likely forgot to take the address of the other expression.
5712 if (Self.DiagnoseConditionalForNull(LHS.get(), RHS.get(), QuestionLoc))
5713 return true;
5714
5715 Self.Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
5716 << LHS.get()->getType() << RHS.get()->getType()
5717 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
5718 return true;
5719
5720 case OR_Ambiguous:
5721 Self.Diag(QuestionLoc, diag::err_conditional_ambiguous_ovl)
5722 << LHS.get()->getType() << RHS.get()->getType()
5723 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
5724 // FIXME: Print the possible common types by printing the return types of
5725 // the viable candidates.
5726 break;
5727
5728 case OR_Deleted:
5729 llvm_unreachable("Conditional operator has only built-in overloads")::llvm::llvm_unreachable_internal("Conditional operator has only built-in overloads"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaExprCXX.cpp"
, 5729)
;
5730 }
5731 return true;
5732}
5733
5734/// Perform an "extended" implicit conversion as returned by
5735/// TryClassUnification.
5736static bool ConvertForConditional(Sema &Self, ExprResult &E, QualType T) {
5737 InitializedEntity Entity = InitializedEntity::InitializeTemporary(T);
5738 InitializationKind Kind =
5739 InitializationKind::CreateCopy(E.get()->getBeginLoc(), SourceLocation());
5740 Expr *Arg = E.get();
5741 InitializationSequence InitSeq(Self, Entity, Kind, Arg);
5742 ExprResult Result = InitSeq.Perform(Self, Entity, Kind, Arg);
5743 if (Result.isInvalid())
5744 return true;
5745
5746 E = Result;
5747 return false;
5748}
5749
5750/// Check the operands of ?: under C++ semantics.
5751///
5752/// See C++ [expr.cond]. Note that LHS is never null, even for the GNU x ?: y
5753/// extension. In this case, LHS == Cond. (But they're not aliases.)
5754QualType Sema::CXXCheckConditionalOperands(ExprResult &Cond, ExprResult &LHS,
5755 ExprResult &RHS, ExprValueKind &VK,
5756 ExprObjectKind &OK,
5757 SourceLocation QuestionLoc) {
5758 // FIXME: Handle C99's complex types, vector types, block pointers and Obj-C++
5759 // interface pointers.
5760
5761 // C++11 [expr.cond]p1
5762 // The first expression is contextually converted to bool.
5763 //
5764 // FIXME; GCC's vector extension permits the use of a?b:c where the type of
5765 // a is that of a integer vector with the same number of elements and
5766 // size as the vectors of b and c. If one of either b or c is a scalar
5767 // it is implicitly converted to match the type of the vector.
5768 // Otherwise the expression is ill-formed. If both b and c are scalars,
5769 // then b and c are checked and converted to the type of a if possible.
5770 // Unlike the OpenCL ?: operator, the expression is evaluated as
5771 // (a[0] != 0 ? b[0] : c[0], .. , a[n] != 0 ? b[n] : c[n]).
5772 if (!Cond.get()->isTypeDependent()) {
5773 ExprResult CondRes = CheckCXXBooleanCondition(Cond.get());
5774 if (CondRes.isInvalid())
5775 return QualType();
5776 Cond = CondRes;
5777 }
5778
5779 // Assume r-value.
5780 VK = VK_RValue;
5781 OK = OK_Ordinary;
5782
5783 // Either of the arguments dependent?
5784 if (LHS.get()->isTypeDependent() || RHS.get()->isTypeDependent())
5785 return Context.DependentTy;
5786
5787 // C++11 [expr.cond]p2
5788 // If either the second or the third operand has type (cv) void, ...
5789 QualType LTy = LHS.get()->getType();
5790 QualType RTy = RHS.get()->getType();
5791 bool LVoid = LTy->isVoidType();
5792 bool RVoid = RTy->isVoidType();
5793 if (LVoid || RVoid) {
5794 // ... one of the following shall hold:
5795 // -- The second or the third operand (but not both) is a (possibly
5796 // parenthesized) throw-expression; the result is of the type
5797 // and value category of the other.
5798 bool LThrow = isa<CXXThrowExpr>(LHS.get()->IgnoreParenImpCasts());
5799 bool RThrow = isa<CXXThrowExpr>(RHS.get()->IgnoreParenImpCasts());
5800 if (LThrow != RThrow) {
5801 Expr *NonThrow = LThrow ? RHS.get() : LHS.get();
5802 VK = NonThrow->getValueKind();
5803 // DR (no number yet): the result is a bit-field if the
5804 // non-throw-expression operand is a bit-field.
5805 OK = NonThrow->getObjectKind();
5806 return NonThrow->getType();
5807 }
5808
5809 // -- Both the second and third operands have type void; the result is of
5810 // type void and is a prvalue.
5811 if (LVoid && RVoid)
5812 return Context.VoidTy;
5813
5814 // Neither holds, error.
5815 Diag(QuestionLoc, diag::err_conditional_void_nonvoid)
5816 << (LVoid ? RTy : LTy) << (LVoid ? 0 : 1)
5817 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
5818 return QualType();
5819 }
5820
5821 // Neither is void.
5822
5823 // C++11 [expr.cond]p3
5824 // Otherwise, if the second and third operand have different types, and
5825 // either has (cv) class type [...] an attempt is made to convert each of
5826 // those operands to the type of the other.
5827 if (!Context.hasSameType(LTy, RTy) &&
5828 (LTy->isRecordType() || RTy->isRecordType())) {
5829 // These return true if a single direction is already ambiguous.
5830 QualType L2RType, R2LType;
5831 bool HaveL2R, HaveR2L;
5832 if (TryClassUnification(*this, LHS.get(), RHS.get(), QuestionLoc, HaveL2R, L2RType))
5833 return QualType();
5834 if (TryClassUnification(*this, RHS.get(), LHS.get(), QuestionLoc, HaveR2L, R2LType))
5835 return QualType();
5836
5837 // If both can be converted, [...] the program is ill-formed.
5838 if (HaveL2R && HaveR2L) {
5839 Diag(QuestionLoc, diag::err_conditional_ambiguous)
5840 << LTy << RTy << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
5841 return QualType();
5842 }
5843
5844 // If exactly one conversion is possible, that conversion is applied to
5845 // the chosen operand and the converted operands are used in place of the
5846 // original operands for the remainder of this section.
5847 if (HaveL2R) {
5848 if (ConvertForConditional(*this, LHS, L2RType) || LHS.isInvalid())
5849 return QualType();
5850 LTy = LHS.get()->getType();
5851 } else if (HaveR2L) {