Bug Summary

File:clang/lib/Sema/SemaExprMember.cpp
Warning:line 378, column 12
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 SemaExprMember.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-11/lib/clang/11.0.0 -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-11~++20200309111110+2c36c23f347/build-llvm/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema -I /build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include -I /build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/build-llvm/include -I /build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/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-11/lib/clang/11.0.0/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-11~++20200309111110+2c36c23f347/build-llvm/tools/clang/lib/Sema -fdebug-prefix-map=/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347=. -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-2020-03-09-184146-41876-1 -x c++ /build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp
1//===--- SemaExprMember.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// This file implements semantic analysis member access expressions.
10//
11//===----------------------------------------------------------------------===//
12#include "clang/Sema/Overload.h"
13#include "clang/AST/ASTLambda.h"
14#include "clang/AST/DeclCXX.h"
15#include "clang/AST/DeclObjC.h"
16#include "clang/AST/DeclTemplate.h"
17#include "clang/AST/ExprCXX.h"
18#include "clang/AST/ExprObjC.h"
19#include "clang/Lex/Preprocessor.h"
20#include "clang/Sema/Lookup.h"
21#include "clang/Sema/Scope.h"
22#include "clang/Sema/ScopeInfo.h"
23#include "clang/Sema/SemaInternal.h"
24
25using namespace clang;
26using namespace sema;
27
28typedef llvm::SmallPtrSet<const CXXRecordDecl*, 4> BaseSet;
29
30/// Determines if the given class is provably not derived from all of
31/// the prospective base classes.
32static bool isProvablyNotDerivedFrom(Sema &SemaRef, CXXRecordDecl *Record,
33 const BaseSet &Bases) {
34 auto BaseIsNotInSet = [&Bases](const CXXRecordDecl *Base) {
35 return !Bases.count(Base->getCanonicalDecl());
36 };
37 return BaseIsNotInSet(Record) && Record->forallBases(BaseIsNotInSet);
38}
39
40enum IMAKind {
41 /// The reference is definitely not an instance member access.
42 IMA_Static,
43
44 /// The reference may be an implicit instance member access.
45 IMA_Mixed,
46
47 /// The reference may be to an instance member, but it might be invalid if
48 /// so, because the context is not an instance method.
49 IMA_Mixed_StaticContext,
50
51 /// The reference may be to an instance member, but it is invalid if
52 /// so, because the context is from an unrelated class.
53 IMA_Mixed_Unrelated,
54
55 /// The reference is definitely an implicit instance member access.
56 IMA_Instance,
57
58 /// The reference may be to an unresolved using declaration.
59 IMA_Unresolved,
60
61 /// The reference is a contextually-permitted abstract member reference.
62 IMA_Abstract,
63
64 /// The reference may be to an unresolved using declaration and the
65 /// context is not an instance method.
66 IMA_Unresolved_StaticContext,
67
68 // The reference refers to a field which is not a member of the containing
69 // class, which is allowed because we're in C++11 mode and the context is
70 // unevaluated.
71 IMA_Field_Uneval_Context,
72
73 /// All possible referrents are instance members and the current
74 /// context is not an instance method.
75 IMA_Error_StaticContext,
76
77 /// All possible referrents are instance members of an unrelated
78 /// class.
79 IMA_Error_Unrelated
80};
81
82/// The given lookup names class member(s) and is not being used for
83/// an address-of-member expression. Classify the type of access
84/// according to whether it's possible that this reference names an
85/// instance member. This is best-effort in dependent contexts; it is okay to
86/// conservatively answer "yes", in which case some errors will simply
87/// not be caught until template-instantiation.
88static IMAKind ClassifyImplicitMemberAccess(Sema &SemaRef,
89 const LookupResult &R) {
90 assert(!R.empty() && (*R.begin())->isCXXClassMember())((!R.empty() && (*R.begin())->isCXXClassMember()) ?
static_cast<void> (0) : __assert_fail ("!R.empty() && (*R.begin())->isCXXClassMember()"
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 90, __PRETTY_FUNCTION__))
;
91
92 DeclContext *DC = SemaRef.getFunctionLevelDeclContext();
93
94 bool isStaticContext = SemaRef.CXXThisTypeOverride.isNull() &&
95 (!isa<CXXMethodDecl>(DC) || cast<CXXMethodDecl>(DC)->isStatic());
96
97 if (R.isUnresolvableResult())
98 return isStaticContext ? IMA_Unresolved_StaticContext : IMA_Unresolved;
99
100 // Collect all the declaring classes of instance members we find.
101 bool hasNonInstance = false;
102 bool isField = false;
103 BaseSet Classes;
104 for (NamedDecl *D : R) {
105 // Look through any using decls.
106 D = D->getUnderlyingDecl();
107
108 if (D->isCXXInstanceMember()) {
109 isField |= isa<FieldDecl>(D) || isa<MSPropertyDecl>(D) ||
110 isa<IndirectFieldDecl>(D);
111
112 CXXRecordDecl *R = cast<CXXRecordDecl>(D->getDeclContext());
113 Classes.insert(R->getCanonicalDecl());
114 } else
115 hasNonInstance = true;
116 }
117
118 // If we didn't find any instance members, it can't be an implicit
119 // member reference.
120 if (Classes.empty())
121 return IMA_Static;
122
123 // C++11 [expr.prim.general]p12:
124 // An id-expression that denotes a non-static data member or non-static
125 // member function of a class can only be used:
126 // (...)
127 // - if that id-expression denotes a non-static data member and it
128 // appears in an unevaluated operand.
129 //
130 // This rule is specific to C++11. However, we also permit this form
131 // in unevaluated inline assembly operands, like the operand to a SIZE.
132 IMAKind AbstractInstanceResult = IMA_Static; // happens to be 'false'
133 assert(!AbstractInstanceResult)((!AbstractInstanceResult) ? static_cast<void> (0) : __assert_fail
("!AbstractInstanceResult", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 133, __PRETTY_FUNCTION__))
;
134 switch (SemaRef.ExprEvalContexts.back().Context) {
135 case Sema::ExpressionEvaluationContext::Unevaluated:
136 case Sema::ExpressionEvaluationContext::UnevaluatedList:
137 if (isField && SemaRef.getLangOpts().CPlusPlus11)
138 AbstractInstanceResult = IMA_Field_Uneval_Context;
139 break;
140
141 case Sema::ExpressionEvaluationContext::UnevaluatedAbstract:
142 AbstractInstanceResult = IMA_Abstract;
143 break;
144
145 case Sema::ExpressionEvaluationContext::DiscardedStatement:
146 case Sema::ExpressionEvaluationContext::ConstantEvaluated:
147 case Sema::ExpressionEvaluationContext::PotentiallyEvaluated:
148 case Sema::ExpressionEvaluationContext::PotentiallyEvaluatedIfUsed:
149 break;
150 }
151
152 // If the current context is not an instance method, it can't be
153 // an implicit member reference.
154 if (isStaticContext) {
155 if (hasNonInstance)
156 return IMA_Mixed_StaticContext;
157
158 return AbstractInstanceResult ? AbstractInstanceResult
159 : IMA_Error_StaticContext;
160 }
161
162 CXXRecordDecl *contextClass;
163 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(DC))
164 contextClass = MD->getParent()->getCanonicalDecl();
165 else
166 contextClass = cast<CXXRecordDecl>(DC);
167
168 // [class.mfct.non-static]p3:
169 // ...is used in the body of a non-static member function of class X,
170 // if name lookup (3.4.1) resolves the name in the id-expression to a
171 // non-static non-type member of some class C [...]
172 // ...if C is not X or a base class of X, the class member access expression
173 // is ill-formed.
174 if (R.getNamingClass() &&
175 contextClass->getCanonicalDecl() !=
176 R.getNamingClass()->getCanonicalDecl()) {
177 // If the naming class is not the current context, this was a qualified
178 // member name lookup, and it's sufficient to check that we have the naming
179 // class as a base class.
180 Classes.clear();
181 Classes.insert(R.getNamingClass()->getCanonicalDecl());
182 }
183
184 // If we can prove that the current context is unrelated to all the
185 // declaring classes, it can't be an implicit member reference (in
186 // which case it's an error if any of those members are selected).
187 if (isProvablyNotDerivedFrom(SemaRef, contextClass, Classes))
188 return hasNonInstance ? IMA_Mixed_Unrelated :
189 AbstractInstanceResult ? AbstractInstanceResult :
190 IMA_Error_Unrelated;
191
192 return (hasNonInstance ? IMA_Mixed : IMA_Instance);
193}
194
195/// Diagnose a reference to a field with no object available.
196static void diagnoseInstanceReference(Sema &SemaRef,
197 const CXXScopeSpec &SS,
198 NamedDecl *Rep,
199 const DeclarationNameInfo &nameInfo) {
200 SourceLocation Loc = nameInfo.getLoc();
201 SourceRange Range(Loc);
202 if (SS.isSet()) Range.setBegin(SS.getRange().getBegin());
203
204 // Look through using shadow decls and aliases.
205 Rep = Rep->getUnderlyingDecl();
206
207 DeclContext *FunctionLevelDC = SemaRef.getFunctionLevelDeclContext();
208 CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FunctionLevelDC);
209 CXXRecordDecl *ContextClass = Method ? Method->getParent() : nullptr;
210 CXXRecordDecl *RepClass = dyn_cast<CXXRecordDecl>(Rep->getDeclContext());
211
212 bool InStaticMethod = Method && Method->isStatic();
213 bool IsField = isa<FieldDecl>(Rep) || isa<IndirectFieldDecl>(Rep);
214
215 if (IsField && InStaticMethod)
216 // "invalid use of member 'x' in static member function"
217 SemaRef.Diag(Loc, diag::err_invalid_member_use_in_static_method)
218 << Range << nameInfo.getName();
219 else if (ContextClass && RepClass && SS.isEmpty() && !InStaticMethod &&
220 !RepClass->Equals(ContextClass) && RepClass->Encloses(ContextClass))
221 // Unqualified lookup in a non-static member function found a member of an
222 // enclosing class.
223 SemaRef.Diag(Loc, diag::err_nested_non_static_member_use)
224 << IsField << RepClass << nameInfo.getName() << ContextClass << Range;
225 else if (IsField)
226 SemaRef.Diag(Loc, diag::err_invalid_non_static_member_use)
227 << nameInfo.getName() << Range;
228 else
229 SemaRef.Diag(Loc, diag::err_member_call_without_object)
230 << Range;
231}
232
233/// Builds an expression which might be an implicit member expression.
234ExprResult
235Sema::BuildPossibleImplicitMemberExpr(const CXXScopeSpec &SS,
236 SourceLocation TemplateKWLoc,
237 LookupResult &R,
238 const TemplateArgumentListInfo *TemplateArgs,
239 const Scope *S) {
240 switch (ClassifyImplicitMemberAccess(*this, R)) {
241 case IMA_Instance:
242 return BuildImplicitMemberExpr(SS, TemplateKWLoc, R, TemplateArgs, true, S);
243
244 case IMA_Mixed:
245 case IMA_Mixed_Unrelated:
246 case IMA_Unresolved:
247 return BuildImplicitMemberExpr(SS, TemplateKWLoc, R, TemplateArgs, false,
248 S);
249
250 case IMA_Field_Uneval_Context:
251 Diag(R.getNameLoc(), diag::warn_cxx98_compat_non_static_member_use)
252 << R.getLookupNameInfo().getName();
253 LLVM_FALLTHROUGH[[gnu::fallthrough]];
254 case IMA_Static:
255 case IMA_Abstract:
256 case IMA_Mixed_StaticContext:
257 case IMA_Unresolved_StaticContext:
258 if (TemplateArgs || TemplateKWLoc.isValid())
259 return BuildTemplateIdExpr(SS, TemplateKWLoc, R, false, TemplateArgs);
260 return BuildDeclarationNameExpr(SS, R, false);
261
262 case IMA_Error_StaticContext:
263 case IMA_Error_Unrelated:
264 diagnoseInstanceReference(*this, SS, R.getRepresentativeDecl(),
265 R.getLookupNameInfo());
266 return ExprError();
267 }
268
269 llvm_unreachable("unexpected instance member access kind")::llvm::llvm_unreachable_internal("unexpected instance member access kind"
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 269)
;
270}
271
272/// Determine whether input char is from rgba component set.
273static bool
274IsRGBA(char c) {
275 switch (c) {
276 case 'r':
277 case 'g':
278 case 'b':
279 case 'a':
280 return true;
281 default:
282 return false;
283 }
284}
285
286// OpenCL v1.1, s6.1.7
287// The component swizzle length must be in accordance with the acceptable
288// vector sizes.
289static bool IsValidOpenCLComponentSwizzleLength(unsigned len)
290{
291 return (len >= 1 && len <= 4) || len == 8 || len == 16;
292}
293
294/// Check an ext-vector component access expression.
295///
296/// VK should be set in advance to the value kind of the base
297/// expression.
298static QualType
299CheckExtVectorComponent(Sema &S, QualType baseType, ExprValueKind &VK,
300 SourceLocation OpLoc, const IdentifierInfo *CompName,
301 SourceLocation CompLoc) {
302 // FIXME: Share logic with ExtVectorElementExpr::containsDuplicateElements,
303 // see FIXME there.
304 //
305 // FIXME: This logic can be greatly simplified by splitting it along
306 // halving/not halving and reworking the component checking.
307 const ExtVectorType *vecType = baseType->getAs<ExtVectorType>();
20
Assuming the object is not a 'ExtVectorType'
21
'vecType' initialized to a null pointer value
308
309 // The vector accessor can't exceed the number of elements.
310 const char *compStr = CompName->getNameStart();
311
312 // This flag determines whether or not the component is one of the four
313 // special names that indicate a subset of exactly half the elements are
314 // to be selected.
315 bool HalvingSwizzle = false;
316
317 // This flag determines whether or not CompName has an 's' char prefix,
318 // indicating that it is a string of hex values to be used as vector indices.
319 bool HexSwizzle = (*compStr == 's' || *compStr == 'S') && compStr[1];
22
Assuming the condition is false
23
Assuming the condition is false
320
321 bool HasRepeated = false;
322 bool HasIndex[16] = {};
323
324 int Idx;
325
326 // Check that we've found one of the special components, or that the component
327 // names must come from the same set.
328 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") ||
24
Assuming the condition is false
25
Assuming the condition is false
28
Taking false branch
329 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) {
26
Assuming the condition is false
27
Assuming the condition is false
330 HalvingSwizzle = true;
331 } else if (!HexSwizzle
28.1
'HexSwizzle' is false
&&
29
Taking true branch
332 (Idx = vecType->getPointAccessorIdx(*compStr)) != -1) {
333 bool HasRGBA = IsRGBA(*compStr);
334 do {
33
Loop condition is false. Exiting loop
335 // Ensure that xyzw and rgba components don't intermingle.
336 if (HasRGBA != IsRGBA(*compStr))
30
Taking false branch
337 break;
338 if (HasIndex[Idx]) HasRepeated = true;
31
Taking false branch
339 HasIndex[Idx] = true;
340 compStr++;
341 } while (*compStr && (Idx = vecType->getPointAccessorIdx(*compStr)) != -1);
32
Assuming the condition is false
342
343 // Emit a warning if an rgba selector is used earlier than OpenCL 2.2
344 if (HasRGBA
33.1
'HasRGBA' is false
|| (*compStr && IsRGBA(*compStr))) {
345 if (S.getLangOpts().OpenCL && S.getLangOpts().OpenCLVersion < 220) {
346 const char *DiagBegin = HasRGBA ? CompName->getNameStart() : compStr;
347 S.Diag(OpLoc, diag::ext_opencl_ext_vector_type_rgba_selector)
348 << StringRef(DiagBegin, 1)
349 << S.getLangOpts().OpenCLVersion << SourceRange(CompLoc);
350 }
351 }
352 } else {
353 if (HexSwizzle) compStr++;
354 while ((Idx = vecType->getNumericAccessorIdx(*compStr)) != -1) {
355 if (HasIndex[Idx]) HasRepeated = true;
356 HasIndex[Idx] = true;
357 compStr++;
358 }
359 }
360
361 if (!HalvingSwizzle
33.2
'HalvingSwizzle' is false
&& *compStr) {
34
Taking false branch
362 // We didn't get to the end of the string. This means the component names
363 // didn't come from the same set *or* we encountered an illegal name.
364 S.Diag(OpLoc, diag::err_ext_vector_component_name_illegal)
365 << StringRef(compStr, 1) << SourceRange(CompLoc);
366 return QualType();
367 }
368
369 // Ensure no component accessor exceeds the width of the vector type it
370 // operates on.
371 if (!HalvingSwizzle
34.1
'HalvingSwizzle' is false
) {
35
Taking true branch
372 compStr = CompName->getNameStart();
373
374 if (HexSwizzle
35.1
'HexSwizzle' is false
)
36
Taking false branch
375 compStr++;
376
377 while (*compStr) {
37
Loop condition is true. Entering loop body
378 if (!vecType->isAccessorWithinNumElements(*compStr++, HexSwizzle)) {
38
Called C++ object pointer is null
379 S.Diag(OpLoc, diag::err_ext_vector_component_exceeds_length)
380 << baseType << SourceRange(CompLoc);
381 return QualType();
382 }
383 }
384 }
385
386 // OpenCL mode requires swizzle length to be in accordance with accepted
387 // sizes. Clang however supports arbitrary lengths for other languages.
388 if (S.getLangOpts().OpenCL && !HalvingSwizzle) {
389 unsigned SwizzleLength = CompName->getLength();
390
391 if (HexSwizzle)
392 SwizzleLength--;
393
394 if (IsValidOpenCLComponentSwizzleLength(SwizzleLength) == false) {
395 S.Diag(OpLoc, diag::err_opencl_ext_vector_component_invalid_length)
396 << SwizzleLength << SourceRange(CompLoc);
397 return QualType();
398 }
399 }
400
401 // The component accessor looks fine - now we need to compute the actual type.
402 // The vector type is implied by the component accessor. For example,
403 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc.
404 // vec4.s0 is a float, vec4.s23 is a vec3, etc.
405 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2.
406 unsigned CompSize = HalvingSwizzle ? (vecType->getNumElements() + 1) / 2
407 : CompName->getLength();
408 if (HexSwizzle)
409 CompSize--;
410
411 if (CompSize == 1)
412 return vecType->getElementType();
413
414 if (HasRepeated) VK = VK_RValue;
415
416 QualType VT = S.Context.getExtVectorType(vecType->getElementType(), CompSize);
417 // Now look up the TypeDefDecl from the vector type. Without this,
418 // diagostics look bad. We want extended vector types to appear built-in.
419 for (Sema::ExtVectorDeclsType::iterator
420 I = S.ExtVectorDecls.begin(S.getExternalSource()),
421 E = S.ExtVectorDecls.end();
422 I != E; ++I) {
423 if ((*I)->getUnderlyingType() == VT)
424 return S.Context.getTypedefType(*I);
425 }
426
427 return VT; // should never get here (a typedef type should always be found).
428}
429
430static Decl *FindGetterSetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl,
431 IdentifierInfo *Member,
432 const Selector &Sel,
433 ASTContext &Context) {
434 if (Member)
435 if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(
436 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance))
437 return PD;
438 if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Sel))
439 return OMD;
440
441 for (const auto *I : PDecl->protocols()) {
442 if (Decl *D = FindGetterSetterNameDeclFromProtocolList(I, Member, Sel,
443 Context))
444 return D;
445 }
446 return nullptr;
447}
448
449static Decl *FindGetterSetterNameDecl(const ObjCObjectPointerType *QIdTy,
450 IdentifierInfo *Member,
451 const Selector &Sel,
452 ASTContext &Context) {
453 // Check protocols on qualified interfaces.
454 Decl *GDecl = nullptr;
455 for (const auto *I : QIdTy->quals()) {
456 if (Member)
457 if (ObjCPropertyDecl *PD = I->FindPropertyDeclaration(
458 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) {
459 GDecl = PD;
460 break;
461 }
462 // Also must look for a getter or setter name which uses property syntax.
463 if (ObjCMethodDecl *OMD = I->getInstanceMethod(Sel)) {
464 GDecl = OMD;
465 break;
466 }
467 }
468 if (!GDecl) {
469 for (const auto *I : QIdTy->quals()) {
470 // Search in the protocol-qualifier list of current protocol.
471 GDecl = FindGetterSetterNameDeclFromProtocolList(I, Member, Sel, Context);
472 if (GDecl)
473 return GDecl;
474 }
475 }
476 return GDecl;
477}
478
479ExprResult
480Sema::ActOnDependentMemberExpr(Expr *BaseExpr, QualType BaseType,
481 bool IsArrow, SourceLocation OpLoc,
482 const CXXScopeSpec &SS,
483 SourceLocation TemplateKWLoc,
484 NamedDecl *FirstQualifierInScope,
485 const DeclarationNameInfo &NameInfo,
486 const TemplateArgumentListInfo *TemplateArgs) {
487 // Even in dependent contexts, try to diagnose base expressions with
488 // obviously wrong types, e.g.:
489 //
490 // T* t;
491 // t.f;
492 //
493 // In Obj-C++, however, the above expression is valid, since it could be
494 // accessing the 'f' property if T is an Obj-C interface. The extra check
495 // allows this, while still reporting an error if T is a struct pointer.
496 if (!IsArrow) {
497 const PointerType *PT = BaseType->getAs<PointerType>();
498 if (PT && (!getLangOpts().ObjC ||
499 PT->getPointeeType()->isRecordType())) {
500 assert(BaseExpr && "cannot happen with implicit member accesses")((BaseExpr && "cannot happen with implicit member accesses"
) ? static_cast<void> (0) : __assert_fail ("BaseExpr && \"cannot happen with implicit member accesses\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 500, __PRETTY_FUNCTION__))
;
501 Diag(OpLoc, diag::err_typecheck_member_reference_struct_union)
502 << BaseType << BaseExpr->getSourceRange() << NameInfo.getSourceRange();
503 return ExprError();
504 }
505 }
506
507 assert(BaseType->isDependentType() ||((BaseType->isDependentType() || NameInfo.getName().isDependentName
() || isDependentScopeSpecifier(SS)) ? static_cast<void>
(0) : __assert_fail ("BaseType->isDependentType() || NameInfo.getName().isDependentName() || isDependentScopeSpecifier(SS)"
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 509, __PRETTY_FUNCTION__))
508 NameInfo.getName().isDependentName() ||((BaseType->isDependentType() || NameInfo.getName().isDependentName
() || isDependentScopeSpecifier(SS)) ? static_cast<void>
(0) : __assert_fail ("BaseType->isDependentType() || NameInfo.getName().isDependentName() || isDependentScopeSpecifier(SS)"
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 509, __PRETTY_FUNCTION__))
509 isDependentScopeSpecifier(SS))((BaseType->isDependentType() || NameInfo.getName().isDependentName
() || isDependentScopeSpecifier(SS)) ? static_cast<void>
(0) : __assert_fail ("BaseType->isDependentType() || NameInfo.getName().isDependentName() || isDependentScopeSpecifier(SS)"
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 509, __PRETTY_FUNCTION__))
;
510
511 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr
512 // must have pointer type, and the accessed type is the pointee.
513 return CXXDependentScopeMemberExpr::Create(
514 Context, BaseExpr, BaseType, IsArrow, OpLoc,
515 SS.getWithLocInContext(Context), TemplateKWLoc, FirstQualifierInScope,
516 NameInfo, TemplateArgs);
517}
518
519/// We know that the given qualified member reference points only to
520/// declarations which do not belong to the static type of the base
521/// expression. Diagnose the problem.
522static void DiagnoseQualifiedMemberReference(Sema &SemaRef,
523 Expr *BaseExpr,
524 QualType BaseType,
525 const CXXScopeSpec &SS,
526 NamedDecl *rep,
527 const DeclarationNameInfo &nameInfo) {
528 // If this is an implicit member access, use a different set of
529 // diagnostics.
530 if (!BaseExpr)
531 return diagnoseInstanceReference(SemaRef, SS, rep, nameInfo);
532
533 SemaRef.Diag(nameInfo.getLoc(), diag::err_qualified_member_of_unrelated)
534 << SS.getRange() << rep << BaseType;
535}
536
537// Check whether the declarations we found through a nested-name
538// specifier in a member expression are actually members of the base
539// type. The restriction here is:
540//
541// C++ [expr.ref]p2:
542// ... In these cases, the id-expression shall name a
543// member of the class or of one of its base classes.
544//
545// So it's perfectly legitimate for the nested-name specifier to name
546// an unrelated class, and for us to find an overload set including
547// decls from classes which are not superclasses, as long as the decl
548// we actually pick through overload resolution is from a superclass.
549bool Sema::CheckQualifiedMemberReference(Expr *BaseExpr,
550 QualType BaseType,
551 const CXXScopeSpec &SS,
552 const LookupResult &R) {
553 CXXRecordDecl *BaseRecord =
554 cast_or_null<CXXRecordDecl>(computeDeclContext(BaseType));
555 if (!BaseRecord) {
556 // We can't check this yet because the base type is still
557 // dependent.
558 assert(BaseType->isDependentType())((BaseType->isDependentType()) ? static_cast<void> (
0) : __assert_fail ("BaseType->isDependentType()", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 558, __PRETTY_FUNCTION__))
;
559 return false;
560 }
561
562 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
563 // If this is an implicit member reference and we find a
564 // non-instance member, it's not an error.
565 if (!BaseExpr && !(*I)->isCXXInstanceMember())
566 return false;
567
568 // Note that we use the DC of the decl, not the underlying decl.
569 DeclContext *DC = (*I)->getDeclContext();
570 while (DC->isTransparentContext())
571 DC = DC->getParent();
572
573 if (!DC->isRecord())
574 continue;
575
576 CXXRecordDecl *MemberRecord = cast<CXXRecordDecl>(DC)->getCanonicalDecl();
577 if (BaseRecord->getCanonicalDecl() == MemberRecord ||
578 !BaseRecord->isProvablyNotDerivedFrom(MemberRecord))
579 return false;
580 }
581
582 DiagnoseQualifiedMemberReference(*this, BaseExpr, BaseType, SS,
583 R.getRepresentativeDecl(),
584 R.getLookupNameInfo());
585 return true;
586}
587
588namespace {
589
590// Callback to only accept typo corrections that are either a ValueDecl or a
591// FunctionTemplateDecl and are declared in the current record or, for a C++
592// classes, one of its base classes.
593class RecordMemberExprValidatorCCC final : public CorrectionCandidateCallback {
594public:
595 explicit RecordMemberExprValidatorCCC(const RecordType *RTy)
596 : Record(RTy->getDecl()) {
597 // Don't add bare keywords to the consumer since they will always fail
598 // validation by virtue of not being associated with any decls.
599 WantTypeSpecifiers = false;
600 WantExpressionKeywords = false;
601 WantCXXNamedCasts = false;
602 WantFunctionLikeCasts = false;
603 WantRemainingKeywords = false;
604 }
605
606 bool ValidateCandidate(const TypoCorrection &candidate) override {
607 NamedDecl *ND = candidate.getCorrectionDecl();
608 // Don't accept candidates that cannot be member functions, constants,
609 // variables, or templates.
610 if (!ND || !(isa<ValueDecl>(ND) || isa<FunctionTemplateDecl>(ND)))
611 return false;
612
613 // Accept candidates that occur in the current record.
614 if (Record->containsDecl(ND))
615 return true;
616
617 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Record)) {
618 // Accept candidates that occur in any of the current class' base classes.
619 for (const auto &BS : RD->bases()) {
620 if (const RecordType *BSTy =
621 dyn_cast_or_null<RecordType>(BS.getType().getTypePtrOrNull())) {
622 if (BSTy->getDecl()->containsDecl(ND))
623 return true;
624 }
625 }
626 }
627
628 return false;
629 }
630
631 std::unique_ptr<CorrectionCandidateCallback> clone() override {
632 return std::make_unique<RecordMemberExprValidatorCCC>(*this);
633 }
634
635private:
636 const RecordDecl *const Record;
637};
638
639}
640
641static bool LookupMemberExprInRecord(Sema &SemaRef, LookupResult &R,
642 Expr *BaseExpr,
643 const RecordType *RTy,
644 SourceLocation OpLoc, bool IsArrow,
645 CXXScopeSpec &SS, bool HasTemplateArgs,
646 SourceLocation TemplateKWLoc,
647 TypoExpr *&TE) {
648 SourceRange BaseRange = BaseExpr ? BaseExpr->getSourceRange() : SourceRange();
649 RecordDecl *RDecl = RTy->getDecl();
650 if (!SemaRef.isThisOutsideMemberFunctionBody(QualType(RTy, 0)) &&
651 SemaRef.RequireCompleteType(OpLoc, QualType(RTy, 0),
652 diag::err_typecheck_incomplete_tag,
653 BaseRange))
654 return true;
655
656 if (HasTemplateArgs || TemplateKWLoc.isValid()) {
657 // LookupTemplateName doesn't expect these both to exist simultaneously.
658 QualType ObjectType = SS.isSet() ? QualType() : QualType(RTy, 0);
659
660 bool MOUS;
661 return SemaRef.LookupTemplateName(R, nullptr, SS, ObjectType, false, MOUS,
662 TemplateKWLoc);
663 }
664
665 DeclContext *DC = RDecl;
666 if (SS.isSet()) {
667 // If the member name was a qualified-id, look into the
668 // nested-name-specifier.
669 DC = SemaRef.computeDeclContext(SS, false);
670
671 if (SemaRef.RequireCompleteDeclContext(SS, DC)) {
672 SemaRef.Diag(SS.getRange().getEnd(), diag::err_typecheck_incomplete_tag)
673 << SS.getRange() << DC;
674 return true;
675 }
676
677 assert(DC && "Cannot handle non-computable dependent contexts in lookup")((DC && "Cannot handle non-computable dependent contexts in lookup"
) ? static_cast<void> (0) : __assert_fail ("DC && \"Cannot handle non-computable dependent contexts in lookup\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 677, __PRETTY_FUNCTION__))
;
678
679 if (!isa<TypeDecl>(DC)) {
680 SemaRef.Diag(R.getNameLoc(), diag::err_qualified_member_nonclass)
681 << DC << SS.getRange();
682 return true;
683 }
684 }
685
686 // The record definition is complete, now look up the member.
687 SemaRef.LookupQualifiedName(R, DC, SS);
688
689 if (!R.empty())
690 return false;
691
692 DeclarationName Typo = R.getLookupName();
693 SourceLocation TypoLoc = R.getNameLoc();
694
695 struct QueryState {
696 Sema &SemaRef;
697 DeclarationNameInfo NameInfo;
698 Sema::LookupNameKind LookupKind;
699 Sema::RedeclarationKind Redecl;
700 };
701 QueryState Q = {R.getSema(), R.getLookupNameInfo(), R.getLookupKind(),
702 R.redeclarationKind()};
703 RecordMemberExprValidatorCCC CCC(RTy);
704 TE = SemaRef.CorrectTypoDelayed(
705 R.getLookupNameInfo(), R.getLookupKind(), nullptr, &SS, CCC,
706 [=, &SemaRef](const TypoCorrection &TC) {
707 if (TC) {
708 assert(!TC.isKeyword() &&((!TC.isKeyword() && "Got a keyword as a correction for a member!"
) ? static_cast<void> (0) : __assert_fail ("!TC.isKeyword() && \"Got a keyword as a correction for a member!\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 709, __PRETTY_FUNCTION__))
709 "Got a keyword as a correction for a member!")((!TC.isKeyword() && "Got a keyword as a correction for a member!"
) ? static_cast<void> (0) : __assert_fail ("!TC.isKeyword() && \"Got a keyword as a correction for a member!\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 709, __PRETTY_FUNCTION__))
;
710 bool DroppedSpecifier =
711 TC.WillReplaceSpecifier() &&
712 Typo.getAsString() == TC.getAsString(SemaRef.getLangOpts());
713 SemaRef.diagnoseTypo(TC, SemaRef.PDiag(diag::err_no_member_suggest)
714 << Typo << DC << DroppedSpecifier
715 << SS.getRange());
716 } else {
717 SemaRef.Diag(TypoLoc, diag::err_no_member) << Typo << DC << BaseRange;
718 }
719 },
720 [=](Sema &SemaRef, TypoExpr *TE, TypoCorrection TC) mutable {
721 LookupResult R(Q.SemaRef, Q.NameInfo, Q.LookupKind, Q.Redecl);
722 R.clear(); // Ensure there's no decls lingering in the shared state.
723 R.suppressDiagnostics();
724 R.setLookupName(TC.getCorrection());
725 for (NamedDecl *ND : TC)
726 R.addDecl(ND);
727 R.resolveKind();
728 return SemaRef.BuildMemberReferenceExpr(
729 BaseExpr, BaseExpr->getType(), OpLoc, IsArrow, SS, SourceLocation(),
730 nullptr, R, nullptr, nullptr);
731 },
732 Sema::CTK_ErrorRecovery, DC);
733
734 return false;
735}
736
737static ExprResult LookupMemberExpr(Sema &S, LookupResult &R,
738 ExprResult &BaseExpr, bool &IsArrow,
739 SourceLocation OpLoc, CXXScopeSpec &SS,
740 Decl *ObjCImpDecl, bool HasTemplateArgs,
741 SourceLocation TemplateKWLoc);
742
743ExprResult
744Sema::BuildMemberReferenceExpr(Expr *Base, QualType BaseType,
745 SourceLocation OpLoc, bool IsArrow,
746 CXXScopeSpec &SS,
747 SourceLocation TemplateKWLoc,
748 NamedDecl *FirstQualifierInScope,
749 const DeclarationNameInfo &NameInfo,
750 const TemplateArgumentListInfo *TemplateArgs,
751 const Scope *S,
752 ActOnMemberAccessExtraArgs *ExtraArgs) {
753 if (BaseType->isDependentType() ||
754 (SS.isSet() && isDependentScopeSpecifier(SS)))
755 return ActOnDependentMemberExpr(Base, BaseType,
756 IsArrow, OpLoc,
757 SS, TemplateKWLoc, FirstQualifierInScope,
758 NameInfo, TemplateArgs);
759
760 LookupResult R(*this, NameInfo, LookupMemberName);
761
762 // Implicit member accesses.
763 if (!Base) {
764 TypoExpr *TE = nullptr;
765 QualType RecordTy = BaseType;
766 if (IsArrow) RecordTy = RecordTy->getAs<PointerType>()->getPointeeType();
767 if (LookupMemberExprInRecord(
768 *this, R, nullptr, RecordTy->getAs<RecordType>(), OpLoc, IsArrow,
769 SS, TemplateArgs != nullptr, TemplateKWLoc, TE))
770 return ExprError();
771 if (TE)
772 return TE;
773
774 // Explicit member accesses.
775 } else {
776 ExprResult BaseResult = Base;
777 ExprResult Result =
778 LookupMemberExpr(*this, R, BaseResult, IsArrow, OpLoc, SS,
779 ExtraArgs ? ExtraArgs->ObjCImpDecl : nullptr,
780 TemplateArgs != nullptr, TemplateKWLoc);
781
782 if (BaseResult.isInvalid())
783 return ExprError();
784 Base = BaseResult.get();
785
786 if (Result.isInvalid())
787 return ExprError();
788
789 if (Result.get())
790 return Result;
791
792 // LookupMemberExpr can modify Base, and thus change BaseType
793 BaseType = Base->getType();
794 }
795
796 return BuildMemberReferenceExpr(Base, BaseType,
797 OpLoc, IsArrow, SS, TemplateKWLoc,
798 FirstQualifierInScope, R, TemplateArgs, S,
799 false, ExtraArgs);
800}
801
802ExprResult
803Sema::BuildAnonymousStructUnionMemberReference(const CXXScopeSpec &SS,
804 SourceLocation loc,
805 IndirectFieldDecl *indirectField,
806 DeclAccessPair foundDecl,
807 Expr *baseObjectExpr,
808 SourceLocation opLoc) {
809 // First, build the expression that refers to the base object.
810
811 // Case 1: the base of the indirect field is not a field.
812 VarDecl *baseVariable = indirectField->getVarDecl();
813 CXXScopeSpec EmptySS;
814 if (baseVariable) {
815 assert(baseVariable->getType()->isRecordType())((baseVariable->getType()->isRecordType()) ? static_cast
<void> (0) : __assert_fail ("baseVariable->getType()->isRecordType()"
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 815, __PRETTY_FUNCTION__))
;
816
817 // In principle we could have a member access expression that
818 // accesses an anonymous struct/union that's a static member of
819 // the base object's class. However, under the current standard,
820 // static data members cannot be anonymous structs or unions.
821 // Supporting this is as easy as building a MemberExpr here.
822 assert(!baseObjectExpr && "anonymous struct/union is static data member?")((!baseObjectExpr && "anonymous struct/union is static data member?"
) ? static_cast<void> (0) : __assert_fail ("!baseObjectExpr && \"anonymous struct/union is static data member?\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 822, __PRETTY_FUNCTION__))
;
823
824 DeclarationNameInfo baseNameInfo(DeclarationName(), loc);
825
826 ExprResult result
827 = BuildDeclarationNameExpr(EmptySS, baseNameInfo, baseVariable);
828 if (result.isInvalid()) return ExprError();
829
830 baseObjectExpr = result.get();
831 }
832
833 assert((baseVariable || baseObjectExpr) &&(((baseVariable || baseObjectExpr) && "referencing anonymous struct/union without a base variable or "
"expression") ? static_cast<void> (0) : __assert_fail (
"(baseVariable || baseObjectExpr) && \"referencing anonymous struct/union without a base variable or \" \"expression\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 835, __PRETTY_FUNCTION__))
834 "referencing anonymous struct/union without a base variable or "(((baseVariable || baseObjectExpr) && "referencing anonymous struct/union without a base variable or "
"expression") ? static_cast<void> (0) : __assert_fail (
"(baseVariable || baseObjectExpr) && \"referencing anonymous struct/union without a base variable or \" \"expression\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 835, __PRETTY_FUNCTION__))
835 "expression")(((baseVariable || baseObjectExpr) && "referencing anonymous struct/union without a base variable or "
"expression") ? static_cast<void> (0) : __assert_fail (
"(baseVariable || baseObjectExpr) && \"referencing anonymous struct/union without a base variable or \" \"expression\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 835, __PRETTY_FUNCTION__))
;
836
837 // Build the implicit member references to the field of the
838 // anonymous struct/union.
839 Expr *result = baseObjectExpr;
840 IndirectFieldDecl::chain_iterator
841 FI = indirectField->chain_begin(), FEnd = indirectField->chain_end();
842
843 // Case 2: the base of the indirect field is a field and the user
844 // wrote a member expression.
845 if (!baseVariable) {
846 FieldDecl *field = cast<FieldDecl>(*FI);
847
848 bool baseObjectIsPointer = baseObjectExpr->getType()->isPointerType();
849
850 // Make a nameInfo that properly uses the anonymous name.
851 DeclarationNameInfo memberNameInfo(field->getDeclName(), loc);
852
853 // Build the first member access in the chain with full information.
854 result =
855 BuildFieldReferenceExpr(result, baseObjectIsPointer, SourceLocation(),
856 SS, field, foundDecl, memberNameInfo)
857 .get();
858 if (!result)
859 return ExprError();
860 }
861
862 // In all cases, we should now skip the first declaration in the chain.
863 ++FI;
864
865 while (FI != FEnd) {
866 FieldDecl *field = cast<FieldDecl>(*FI++);
867
868 // FIXME: these are somewhat meaningless
869 DeclarationNameInfo memberNameInfo(field->getDeclName(), loc);
870 DeclAccessPair fakeFoundDecl =
871 DeclAccessPair::make(field, field->getAccess());
872
873 result =
874 BuildFieldReferenceExpr(result, /*isarrow*/ false, SourceLocation(),
875 (FI == FEnd ? SS : EmptySS), field,
876 fakeFoundDecl, memberNameInfo)
877 .get();
878 }
879
880 return result;
881}
882
883static ExprResult
884BuildMSPropertyRefExpr(Sema &S, Expr *BaseExpr, bool IsArrow,
885 const CXXScopeSpec &SS,
886 MSPropertyDecl *PD,
887 const DeclarationNameInfo &NameInfo) {
888 // Property names are always simple identifiers and therefore never
889 // require any interesting additional storage.
890 return new (S.Context) MSPropertyRefExpr(BaseExpr, PD, IsArrow,
891 S.Context.PseudoObjectTy, VK_LValue,
892 SS.getWithLocInContext(S.Context),
893 NameInfo.getLoc());
894}
895
896MemberExpr *Sema::BuildMemberExpr(
897 Expr *Base, bool IsArrow, SourceLocation OpLoc, const CXXScopeSpec *SS,
898 SourceLocation TemplateKWLoc, ValueDecl *Member, DeclAccessPair FoundDecl,
899 bool HadMultipleCandidates, const DeclarationNameInfo &MemberNameInfo,
900 QualType Ty, ExprValueKind VK, ExprObjectKind OK,
901 const TemplateArgumentListInfo *TemplateArgs) {
902 NestedNameSpecifierLoc NNS =
903 SS ? SS->getWithLocInContext(Context) : NestedNameSpecifierLoc();
904 return BuildMemberExpr(Base, IsArrow, OpLoc, NNS, TemplateKWLoc, Member,
905 FoundDecl, HadMultipleCandidates, MemberNameInfo, Ty,
906 VK, OK, TemplateArgs);
907}
908
909MemberExpr *Sema::BuildMemberExpr(
910 Expr *Base, bool IsArrow, SourceLocation OpLoc, NestedNameSpecifierLoc NNS,
911 SourceLocation TemplateKWLoc, ValueDecl *Member, DeclAccessPair FoundDecl,
912 bool HadMultipleCandidates, const DeclarationNameInfo &MemberNameInfo,
913 QualType Ty, ExprValueKind VK, ExprObjectKind OK,
914 const TemplateArgumentListInfo *TemplateArgs) {
915 assert((!IsArrow || Base->isRValue()) && "-> base must be a pointer rvalue")(((!IsArrow || Base->isRValue()) && "-> base must be a pointer rvalue"
) ? static_cast<void> (0) : __assert_fail ("(!IsArrow || Base->isRValue()) && \"-> base must be a pointer rvalue\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 915, __PRETTY_FUNCTION__))
;
916 MemberExpr *E =
917 MemberExpr::Create(Context, Base, IsArrow, OpLoc, NNS, TemplateKWLoc,
918 Member, FoundDecl, MemberNameInfo, TemplateArgs, Ty,
919 VK, OK, getNonOdrUseReasonInCurrentContext(Member));
920 E->setHadMultipleCandidates(HadMultipleCandidates);
921 MarkMemberReferenced(E);
922
923 // C++ [except.spec]p17:
924 // An exception-specification is considered to be needed when:
925 // - in an expression the function is the unique lookup result or the
926 // selected member of a set of overloaded functions
927 if (auto *FPT = Ty->getAs<FunctionProtoType>()) {
928 if (isUnresolvedExceptionSpec(FPT->getExceptionSpecType())) {
929 if (auto *NewFPT = ResolveExceptionSpec(MemberNameInfo.getLoc(), FPT))
930 E->setType(Context.getQualifiedType(NewFPT, Ty.getQualifiers()));
931 }
932 }
933
934 return E;
935}
936
937/// Determine if the given scope is within a function-try-block handler.
938static bool IsInFnTryBlockHandler(const Scope *S) {
939 // Walk the scope stack until finding a FnTryCatchScope, or leave the
940 // function scope. If a FnTryCatchScope is found, check whether the TryScope
941 // flag is set. If it is not, it's a function-try-block handler.
942 for (; S != S->getFnParent(); S = S->getParent()) {
943 if (S->getFlags() & Scope::FnTryCatchScope)
944 return (S->getFlags() & Scope::TryScope) != Scope::TryScope;
945 }
946 return false;
947}
948
949VarDecl *
950Sema::getVarTemplateSpecialization(VarTemplateDecl *VarTempl,
951 const TemplateArgumentListInfo *TemplateArgs,
952 const DeclarationNameInfo &MemberNameInfo,
953 SourceLocation TemplateKWLoc) {
954 if (!TemplateArgs) {
955 diagnoseMissingTemplateArguments(TemplateName(VarTempl),
956 MemberNameInfo.getBeginLoc());
957 return nullptr;
958 }
959
960 DeclResult VDecl = CheckVarTemplateId(VarTempl, TemplateKWLoc,
961 MemberNameInfo.getLoc(), *TemplateArgs);
962 if (VDecl.isInvalid())
963 return nullptr;
964 VarDecl *Var = cast<VarDecl>(VDecl.get());
965 if (!Var->getTemplateSpecializationKind())
966 Var->setTemplateSpecializationKind(TSK_ImplicitInstantiation,
967 MemberNameInfo.getLoc());
968 return Var;
969}
970
971ExprResult
972Sema::BuildMemberReferenceExpr(Expr *BaseExpr, QualType BaseExprType,
973 SourceLocation OpLoc, bool IsArrow,
974 const CXXScopeSpec &SS,
975 SourceLocation TemplateKWLoc,
976 NamedDecl *FirstQualifierInScope,
977 LookupResult &R,
978 const TemplateArgumentListInfo *TemplateArgs,
979 const Scope *S,
980 bool SuppressQualifierCheck,
981 ActOnMemberAccessExtraArgs *ExtraArgs) {
982 QualType BaseType = BaseExprType;
983 if (IsArrow) {
984 assert(BaseType->isPointerType())((BaseType->isPointerType()) ? static_cast<void> (0)
: __assert_fail ("BaseType->isPointerType()", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 984, __PRETTY_FUNCTION__))
;
985 BaseType = BaseType->castAs<PointerType>()->getPointeeType();
986 }
987 R.setBaseObjectType(BaseType);
988
989 // C++1z [expr.ref]p2:
990 // For the first option (dot) the first expression shall be a glvalue [...]
991 if (!IsArrow && BaseExpr && BaseExpr->isRValue()) {
992 ExprResult Converted = TemporaryMaterializationConversion(BaseExpr);
993 if (Converted.isInvalid())
994 return ExprError();
995 BaseExpr = Converted.get();
996 }
997
998
999 const DeclarationNameInfo &MemberNameInfo = R.getLookupNameInfo();
1000 DeclarationName MemberName = MemberNameInfo.getName();
1001 SourceLocation MemberLoc = MemberNameInfo.getLoc();
1002
1003 if (R.isAmbiguous())
1004 return ExprError();
1005
1006 // [except.handle]p10: Referring to any non-static member or base class of an
1007 // object in the handler for a function-try-block of a constructor or
1008 // destructor for that object results in undefined behavior.
1009 const auto *FD = getCurFunctionDecl();
1010 if (S && BaseExpr && FD &&
1011 (isa<CXXDestructorDecl>(FD) || isa<CXXConstructorDecl>(FD)) &&
1012 isa<CXXThisExpr>(BaseExpr->IgnoreImpCasts()) &&
1013 IsInFnTryBlockHandler(S))
1014 Diag(MemberLoc, diag::warn_cdtor_function_try_handler_mem_expr)
1015 << isa<CXXDestructorDecl>(FD);
1016
1017 if (R.empty()) {
1018 // Rederive where we looked up.
1019 DeclContext *DC = (SS.isSet()
1020 ? computeDeclContext(SS, false)
1021 : BaseType->castAs<RecordType>()->getDecl());
1022
1023 if (ExtraArgs) {
1024 ExprResult RetryExpr;
1025 if (!IsArrow && BaseExpr) {
1026 SFINAETrap Trap(*this, true);
1027 ParsedType ObjectType;
1028 bool MayBePseudoDestructor = false;
1029 RetryExpr = ActOnStartCXXMemberReference(getCurScope(), BaseExpr,
1030 OpLoc, tok::arrow, ObjectType,
1031 MayBePseudoDestructor);
1032 if (RetryExpr.isUsable() && !Trap.hasErrorOccurred()) {
1033 CXXScopeSpec TempSS(SS);
1034 RetryExpr = ActOnMemberAccessExpr(
1035 ExtraArgs->S, RetryExpr.get(), OpLoc, tok::arrow, TempSS,
1036 TemplateKWLoc, ExtraArgs->Id, ExtraArgs->ObjCImpDecl);
1037 }
1038 if (Trap.hasErrorOccurred())
1039 RetryExpr = ExprError();
1040 }
1041 if (RetryExpr.isUsable()) {
1042 Diag(OpLoc, diag::err_no_member_overloaded_arrow)
1043 << MemberName << DC << FixItHint::CreateReplacement(OpLoc, "->");
1044 return RetryExpr;
1045 }
1046 }
1047
1048 Diag(R.getNameLoc(), diag::err_no_member)
1049 << MemberName << DC
1050 << (BaseExpr ? BaseExpr->getSourceRange() : SourceRange());
1051 return ExprError();
1052 }
1053
1054 // Diagnose lookups that find only declarations from a non-base
1055 // type. This is possible for either qualified lookups (which may
1056 // have been qualified with an unrelated type) or implicit member
1057 // expressions (which were found with unqualified lookup and thus
1058 // may have come from an enclosing scope). Note that it's okay for
1059 // lookup to find declarations from a non-base type as long as those
1060 // aren't the ones picked by overload resolution.
1061 if ((SS.isSet() || !BaseExpr ||
1062 (isa<CXXThisExpr>(BaseExpr) &&
1063 cast<CXXThisExpr>(BaseExpr)->isImplicit())) &&
1064 !SuppressQualifierCheck &&
1065 CheckQualifiedMemberReference(BaseExpr, BaseType, SS, R))
1066 return ExprError();
1067
1068 // Construct an unresolved result if we in fact got an unresolved
1069 // result.
1070 if (R.isOverloadedResult() || R.isUnresolvableResult()) {
1071 // Suppress any lookup-related diagnostics; we'll do these when we
1072 // pick a member.
1073 R.suppressDiagnostics();
1074
1075 UnresolvedMemberExpr *MemExpr
1076 = UnresolvedMemberExpr::Create(Context, R.isUnresolvableResult(),
1077 BaseExpr, BaseExprType,
1078 IsArrow, OpLoc,
1079 SS.getWithLocInContext(Context),
1080 TemplateKWLoc, MemberNameInfo,
1081 TemplateArgs, R.begin(), R.end());
1082
1083 return MemExpr;
1084 }
1085
1086 assert(R.isSingleResult())((R.isSingleResult()) ? static_cast<void> (0) : __assert_fail
("R.isSingleResult()", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 1086, __PRETTY_FUNCTION__))
;
1087 DeclAccessPair FoundDecl = R.begin().getPair();
1088 NamedDecl *MemberDecl = R.getFoundDecl();
1089
1090 // FIXME: diagnose the presence of template arguments now.
1091
1092 // If the decl being referenced had an error, return an error for this
1093 // sub-expr without emitting another error, in order to avoid cascading
1094 // error cases.
1095 if (MemberDecl->isInvalidDecl())
1096 return ExprError();
1097
1098 // Handle the implicit-member-access case.
1099 if (!BaseExpr) {
1100 // If this is not an instance member, convert to a non-member access.
1101 if (!MemberDecl->isCXXInstanceMember()) {
1102 // If this is a variable template, get the instantiated variable
1103 // declaration corresponding to the supplied template arguments
1104 // (while emitting diagnostics as necessary) that will be referenced
1105 // by this expression.
1106 assert((!TemplateArgs || isa<VarTemplateDecl>(MemberDecl)) &&(((!TemplateArgs || isa<VarTemplateDecl>(MemberDecl)) &&
"How did we get template arguments here sans a variable template"
) ? static_cast<void> (0) : __assert_fail ("(!TemplateArgs || isa<VarTemplateDecl>(MemberDecl)) && \"How did we get template arguments here sans a variable template\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 1107, __PRETTY_FUNCTION__))
1107 "How did we get template arguments here sans a variable template")(((!TemplateArgs || isa<VarTemplateDecl>(MemberDecl)) &&
"How did we get template arguments here sans a variable template"
) ? static_cast<void> (0) : __assert_fail ("(!TemplateArgs || isa<VarTemplateDecl>(MemberDecl)) && \"How did we get template arguments here sans a variable template\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 1107, __PRETTY_FUNCTION__))
;
1108 if (isa<VarTemplateDecl>(MemberDecl)) {
1109 MemberDecl = getVarTemplateSpecialization(
1110 cast<VarTemplateDecl>(MemberDecl), TemplateArgs,
1111 R.getLookupNameInfo(), TemplateKWLoc);
1112 if (!MemberDecl)
1113 return ExprError();
1114 }
1115 return BuildDeclarationNameExpr(SS, R.getLookupNameInfo(), MemberDecl,
1116 FoundDecl, TemplateArgs);
1117 }
1118 SourceLocation Loc = R.getNameLoc();
1119 if (SS.getRange().isValid())
1120 Loc = SS.getRange().getBegin();
1121 BaseExpr = BuildCXXThisExpr(Loc, BaseExprType, /*IsImplicit=*/true);
1122 }
1123
1124 // Check the use of this member.
1125 if (DiagnoseUseOfDecl(MemberDecl, MemberLoc))
1126 return ExprError();
1127
1128 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl))
1129 return BuildFieldReferenceExpr(BaseExpr, IsArrow, OpLoc, SS, FD, FoundDecl,
1130 MemberNameInfo);
1131
1132 if (MSPropertyDecl *PD = dyn_cast<MSPropertyDecl>(MemberDecl))
1133 return BuildMSPropertyRefExpr(*this, BaseExpr, IsArrow, SS, PD,
1134 MemberNameInfo);
1135
1136 if (IndirectFieldDecl *FD = dyn_cast<IndirectFieldDecl>(MemberDecl))
1137 // We may have found a field within an anonymous union or struct
1138 // (C++ [class.union]).
1139 return BuildAnonymousStructUnionMemberReference(SS, MemberLoc, FD,
1140 FoundDecl, BaseExpr,
1141 OpLoc);
1142
1143 if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) {
1144 return BuildMemberExpr(BaseExpr, IsArrow, OpLoc, &SS, TemplateKWLoc, Var,
1145 FoundDecl, /*HadMultipleCandidates=*/false,
1146 MemberNameInfo, Var->getType().getNonReferenceType(),
1147 VK_LValue, OK_Ordinary);
1148 }
1149
1150 if (CXXMethodDecl *MemberFn = dyn_cast<CXXMethodDecl>(MemberDecl)) {
1151 ExprValueKind valueKind;
1152 QualType type;
1153 if (MemberFn->isInstance()) {
1154 valueKind = VK_RValue;
1155 type = Context.BoundMemberTy;
1156 } else {
1157 valueKind = VK_LValue;
1158 type = MemberFn->getType();
1159 }
1160
1161 return BuildMemberExpr(BaseExpr, IsArrow, OpLoc, &SS, TemplateKWLoc,
1162 MemberFn, FoundDecl, /*HadMultipleCandidates=*/false,
1163 MemberNameInfo, type, valueKind, OK_Ordinary);
1164 }
1165 assert(!isa<FunctionDecl>(MemberDecl) && "member function not C++ method?")((!isa<FunctionDecl>(MemberDecl) && "member function not C++ method?"
) ? static_cast<void> (0) : __assert_fail ("!isa<FunctionDecl>(MemberDecl) && \"member function not C++ method?\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 1165, __PRETTY_FUNCTION__))
;
1166
1167 if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) {
1168 return BuildMemberExpr(BaseExpr, IsArrow, OpLoc, &SS, TemplateKWLoc, Enum,
1169 FoundDecl, /*HadMultipleCandidates=*/false,
1170 MemberNameInfo, Enum->getType(), VK_RValue,
1171 OK_Ordinary);
1172 }
1173 if (VarTemplateDecl *VarTempl = dyn_cast<VarTemplateDecl>(MemberDecl)) {
1174 if (VarDecl *Var = getVarTemplateSpecialization(
1175 VarTempl, TemplateArgs, MemberNameInfo, TemplateKWLoc))
1176 return BuildMemberExpr(
1177 BaseExpr, IsArrow, OpLoc, &SS, TemplateKWLoc, Var, FoundDecl,
1178 /*HadMultipleCandidates=*/false, MemberNameInfo,
1179 Var->getType().getNonReferenceType(), VK_LValue, OK_Ordinary);
1180 return ExprError();
1181 }
1182
1183 // We found something that we didn't expect. Complain.
1184 if (isa<TypeDecl>(MemberDecl))
1185 Diag(MemberLoc, diag::err_typecheck_member_reference_type)
1186 << MemberName << BaseType << int(IsArrow);
1187 else
1188 Diag(MemberLoc, diag::err_typecheck_member_reference_unknown)
1189 << MemberName << BaseType << int(IsArrow);
1190
1191 Diag(MemberDecl->getLocation(), diag::note_member_declared_here)
1192 << MemberName;
1193 R.suppressDiagnostics();
1194 return ExprError();
1195}
1196
1197/// Given that normal member access failed on the given expression,
1198/// and given that the expression's type involves builtin-id or
1199/// builtin-Class, decide whether substituting in the redefinition
1200/// types would be profitable. The redefinition type is whatever
1201/// this translation unit tried to typedef to id/Class; we store
1202/// it to the side and then re-use it in places like this.
1203static bool ShouldTryAgainWithRedefinitionType(Sema &S, ExprResult &base) {
1204 const ObjCObjectPointerType *opty
1205 = base.get()->getType()->getAs<ObjCObjectPointerType>();
1206 if (!opty) return false;
1207
1208 const ObjCObjectType *ty = opty->getObjectType();
1209
1210 QualType redef;
1211 if (ty->isObjCId()) {
1212 redef = S.Context.getObjCIdRedefinitionType();
1213 } else if (ty->isObjCClass()) {
1214 redef = S.Context.getObjCClassRedefinitionType();
1215 } else {
1216 return false;
1217 }
1218
1219 // Do the substitution as long as the redefinition type isn't just a
1220 // possibly-qualified pointer to builtin-id or builtin-Class again.
1221 opty = redef->getAs<ObjCObjectPointerType>();
1222 if (opty && !opty->getObjectType()->getInterface())
1223 return false;
1224
1225 base = S.ImpCastExprToType(base.get(), redef, CK_BitCast);
1226 return true;
1227}
1228
1229static bool isRecordType(QualType T) {
1230 return T->isRecordType();
1231}
1232static bool isPointerToRecordType(QualType T) {
1233 if (const PointerType *PT = T->getAs<PointerType>())
1234 return PT->getPointeeType()->isRecordType();
1235 return false;
1236}
1237
1238/// Perform conversions on the LHS of a member access expression.
1239ExprResult
1240Sema::PerformMemberExprBaseConversion(Expr *Base, bool IsArrow) {
1241 if (IsArrow && !Base->getType()->isFunctionType())
1242 return DefaultFunctionArrayLvalueConversion(Base);
1243
1244 return CheckPlaceholderExpr(Base);
1245}
1246
1247/// Look up the given member of the given non-type-dependent
1248/// expression. This can return in one of two ways:
1249/// * If it returns a sentinel null-but-valid result, the caller will
1250/// assume that lookup was performed and the results written into
1251/// the provided structure. It will take over from there.
1252/// * Otherwise, the returned expression will be produced in place of
1253/// an ordinary member expression.
1254///
1255/// The ObjCImpDecl bit is a gross hack that will need to be properly
1256/// fixed for ObjC++.
1257static ExprResult LookupMemberExpr(Sema &S, LookupResult &R,
1258 ExprResult &BaseExpr, bool &IsArrow,
1259 SourceLocation OpLoc, CXXScopeSpec &SS,
1260 Decl *ObjCImpDecl, bool HasTemplateArgs,
1261 SourceLocation TemplateKWLoc) {
1262 assert(BaseExpr.get() && "no base expression")((BaseExpr.get() && "no base expression") ? static_cast
<void> (0) : __assert_fail ("BaseExpr.get() && \"no base expression\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 1262, __PRETTY_FUNCTION__))
;
1
Assuming the condition is true
2
'?' condition is true
1263
1264 // Perform default conversions.
1265 BaseExpr = S.PerformMemberExprBaseConversion(BaseExpr.get(), IsArrow);
1266 if (BaseExpr.isInvalid())
3
Assuming the condition is false
4
Taking false branch
1267 return ExprError();
1268
1269 QualType BaseType = BaseExpr.get()->getType();
1270 assert(!BaseType->isDependentType())((!BaseType->isDependentType()) ? static_cast<void> (
0) : __assert_fail ("!BaseType->isDependentType()", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 1270, __PRETTY_FUNCTION__))
;
5
Assuming the condition is true
6
'?' condition is true
1271
1272 DeclarationName MemberName = R.getLookupName();
1273 SourceLocation MemberLoc = R.getNameLoc();
1274
1275 // For later type-checking purposes, turn arrow accesses into dot
1276 // accesses. The only access type we support that doesn't follow
1277 // the C equivalence "a->b === (*a).b" is ObjC property accesses,
1278 // and those never use arrows, so this is unaffected.
1279 if (IsArrow
6.1
'IsArrow' is false
) {
7
Taking false branch
1280 if (const PointerType *Ptr = BaseType->getAs<PointerType>())
1281 BaseType = Ptr->getPointeeType();
1282 else if (const ObjCObjectPointerType *Ptr
1283 = BaseType->getAs<ObjCObjectPointerType>())
1284 BaseType = Ptr->getPointeeType();
1285 else if (BaseType->isRecordType()) {
1286 // Recover from arrow accesses to records, e.g.:
1287 // struct MyRecord foo;
1288 // foo->bar
1289 // This is actually well-formed in C++ if MyRecord has an
1290 // overloaded operator->, but that should have been dealt with
1291 // by now--or a diagnostic message already issued if a problem
1292 // was encountered while looking for the overloaded operator->.
1293 if (!S.getLangOpts().CPlusPlus) {
1294 S.Diag(OpLoc, diag::err_typecheck_member_reference_suggestion)
1295 << BaseType << int(IsArrow) << BaseExpr.get()->getSourceRange()
1296 << FixItHint::CreateReplacement(OpLoc, ".");
1297 }
1298 IsArrow = false;
1299 } else if (BaseType->isFunctionType()) {
1300 goto fail;
1301 } else {
1302 S.Diag(MemberLoc, diag::err_typecheck_member_reference_arrow)
1303 << BaseType << BaseExpr.get()->getSourceRange();
1304 return ExprError();
1305 }
1306 }
1307
1308 // Handle field access to simple records.
1309 if (const RecordType *RTy
8.1
'RTy' is null
= BaseType->getAs<RecordType>()) {
8
Assuming the object is not a 'RecordType'
9
Taking false branch
1310 TypoExpr *TE = nullptr;
1311 if (LookupMemberExprInRecord(S, R, BaseExpr.get(), RTy, OpLoc, IsArrow, SS,
1312 HasTemplateArgs, TemplateKWLoc, TE))
1313 return ExprError();
1314
1315 // Returning valid-but-null is how we indicate to the caller that
1316 // the lookup result was filled in. If typo correction was attempted and
1317 // failed, the lookup result will have been cleared--that combined with the
1318 // valid-but-null ExprResult will trigger the appropriate diagnostics.
1319 return ExprResult(TE);
1320 }
1321
1322 // Handle ivar access to Objective-C objects.
1323 if (const ObjCObjectType *OTy
10.1
'OTy' is null
= BaseType->getAs<ObjCObjectType>()) {
10
Assuming the object is not a 'ObjCObjectType'
11
Taking false branch
1324 if (!SS.isEmpty() && !SS.isInvalid()) {
1325 S.Diag(SS.getRange().getBegin(), diag::err_qualified_objc_access)
1326 << 1 << SS.getScopeRep()
1327 << FixItHint::CreateRemoval(SS.getRange());
1328 SS.clear();
1329 }
1330
1331 IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
1332
1333 // There are three cases for the base type:
1334 // - builtin id (qualified or unqualified)
1335 // - builtin Class (qualified or unqualified)
1336 // - an interface
1337 ObjCInterfaceDecl *IDecl = OTy->getInterface();
1338 if (!IDecl) {
1339 if (S.getLangOpts().ObjCAutoRefCount &&
1340 (OTy->isObjCId() || OTy->isObjCClass()))
1341 goto fail;
1342 // There's an implicit 'isa' ivar on all objects.
1343 // But we only actually find it this way on objects of type 'id',
1344 // apparently.
1345 if (OTy->isObjCId() && Member->isStr("isa"))
1346 return new (S.Context) ObjCIsaExpr(BaseExpr.get(), IsArrow, MemberLoc,
1347 OpLoc, S.Context.getObjCClassType());
1348 if (ShouldTryAgainWithRedefinitionType(S, BaseExpr))
1349 return LookupMemberExpr(S, R, BaseExpr, IsArrow, OpLoc, SS,
1350 ObjCImpDecl, HasTemplateArgs, TemplateKWLoc);
1351 goto fail;
1352 }
1353
1354 if (S.RequireCompleteType(OpLoc, BaseType,
1355 diag::err_typecheck_incomplete_tag,
1356 BaseExpr.get()))
1357 return ExprError();
1358
1359 ObjCInterfaceDecl *ClassDeclared = nullptr;
1360 ObjCIvarDecl *IV = IDecl->lookupInstanceVariable(Member, ClassDeclared);
1361
1362 if (!IV) {
1363 // Attempt to correct for typos in ivar names.
1364 DeclFilterCCC<ObjCIvarDecl> Validator{};
1365 Validator.IsObjCIvarLookup = IsArrow;
1366 if (TypoCorrection Corrected = S.CorrectTypo(
1367 R.getLookupNameInfo(), Sema::LookupMemberName, nullptr, nullptr,
1368 Validator, Sema::CTK_ErrorRecovery, IDecl)) {
1369 IV = Corrected.getCorrectionDeclAs<ObjCIvarDecl>();
1370 S.diagnoseTypo(
1371 Corrected,
1372 S.PDiag(diag::err_typecheck_member_reference_ivar_suggest)
1373 << IDecl->getDeclName() << MemberName);
1374
1375 // Figure out the class that declares the ivar.
1376 assert(!ClassDeclared)((!ClassDeclared) ? static_cast<void> (0) : __assert_fail
("!ClassDeclared", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 1376, __PRETTY_FUNCTION__))
;
1377
1378 Decl *D = cast<Decl>(IV->getDeclContext());
1379 if (auto *Category = dyn_cast<ObjCCategoryDecl>(D))
1380 D = Category->getClassInterface();
1381
1382 if (auto *Implementation = dyn_cast<ObjCImplementationDecl>(D))
1383 ClassDeclared = Implementation->getClassInterface();
1384 else if (auto *Interface = dyn_cast<ObjCInterfaceDecl>(D))
1385 ClassDeclared = Interface;
1386
1387 assert(ClassDeclared && "cannot query interface")((ClassDeclared && "cannot query interface") ? static_cast
<void> (0) : __assert_fail ("ClassDeclared && \"cannot query interface\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 1387, __PRETTY_FUNCTION__))
;
1388 } else {
1389 if (IsArrow &&
1390 IDecl->FindPropertyDeclaration(
1391 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) {
1392 S.Diag(MemberLoc, diag::err_property_found_suggest)
1393 << Member << BaseExpr.get()->getType()
1394 << FixItHint::CreateReplacement(OpLoc, ".");
1395 return ExprError();
1396 }
1397
1398 S.Diag(MemberLoc, diag::err_typecheck_member_reference_ivar)
1399 << IDecl->getDeclName() << MemberName
1400 << BaseExpr.get()->getSourceRange();
1401 return ExprError();
1402 }
1403 }
1404
1405 assert(ClassDeclared)((ClassDeclared) ? static_cast<void> (0) : __assert_fail
("ClassDeclared", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 1405, __PRETTY_FUNCTION__))
;
1406
1407 // If the decl being referenced had an error, return an error for this
1408 // sub-expr without emitting another error, in order to avoid cascading
1409 // error cases.
1410 if (IV->isInvalidDecl())
1411 return ExprError();
1412
1413 // Check whether we can reference this field.
1414 if (S.DiagnoseUseOfDecl(IV, MemberLoc))
1415 return ExprError();
1416 if (IV->getAccessControl() != ObjCIvarDecl::Public &&
1417 IV->getAccessControl() != ObjCIvarDecl::Package) {
1418 ObjCInterfaceDecl *ClassOfMethodDecl = nullptr;
1419 if (ObjCMethodDecl *MD = S.getCurMethodDecl())
1420 ClassOfMethodDecl = MD->getClassInterface();
1421 else if (ObjCImpDecl && S.getCurFunctionDecl()) {
1422 // Case of a c-function declared inside an objc implementation.
1423 // FIXME: For a c-style function nested inside an objc implementation
1424 // class, there is no implementation context available, so we pass
1425 // down the context as argument to this routine. Ideally, this context
1426 // need be passed down in the AST node and somehow calculated from the
1427 // AST for a function decl.
1428 if (ObjCImplementationDecl *IMPD =
1429 dyn_cast<ObjCImplementationDecl>(ObjCImpDecl))
1430 ClassOfMethodDecl = IMPD->getClassInterface();
1431 else if (ObjCCategoryImplDecl* CatImplClass =
1432 dyn_cast<ObjCCategoryImplDecl>(ObjCImpDecl))
1433 ClassOfMethodDecl = CatImplClass->getClassInterface();
1434 }
1435 if (!S.getLangOpts().DebuggerSupport) {
1436 if (IV->getAccessControl() == ObjCIvarDecl::Private) {
1437 if (!declaresSameEntity(ClassDeclared, IDecl) ||
1438 !declaresSameEntity(ClassOfMethodDecl, ClassDeclared))
1439 S.Diag(MemberLoc, diag::err_private_ivar_access)
1440 << IV->getDeclName();
1441 } else if (!IDecl->isSuperClassOf(ClassOfMethodDecl))
1442 // @protected
1443 S.Diag(MemberLoc, diag::err_protected_ivar_access)
1444 << IV->getDeclName();
1445 }
1446 }
1447 bool warn = true;
1448 if (S.getLangOpts().ObjCWeak) {
1449 Expr *BaseExp = BaseExpr.get()->IgnoreParenImpCasts();
1450 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(BaseExp))
1451 if (UO->getOpcode() == UO_Deref)
1452 BaseExp = UO->getSubExpr()->IgnoreParenCasts();
1453
1454 if (DeclRefExpr *DE = dyn_cast<DeclRefExpr>(BaseExp))
1455 if (DE->getType().getObjCLifetime() == Qualifiers::OCL_Weak) {
1456 S.Diag(DE->getLocation(), diag::err_arc_weak_ivar_access);
1457 warn = false;
1458 }
1459 }
1460 if (warn) {
1461 if (ObjCMethodDecl *MD = S.getCurMethodDecl()) {
1462 ObjCMethodFamily MF = MD->getMethodFamily();
1463 warn = (MF != OMF_init && MF != OMF_dealloc &&
1464 MF != OMF_finalize &&
1465 !S.IvarBacksCurrentMethodAccessor(IDecl, MD, IV));
1466 }
1467 if (warn)
1468 S.Diag(MemberLoc, diag::warn_direct_ivar_access) << IV->getDeclName();
1469 }
1470
1471 ObjCIvarRefExpr *Result = new (S.Context) ObjCIvarRefExpr(
1472 IV, IV->getUsageType(BaseType), MemberLoc, OpLoc, BaseExpr.get(),
1473 IsArrow);
1474
1475 if (IV->getType().getObjCLifetime() == Qualifiers::OCL_Weak) {
1476 if (!S.isUnevaluatedContext() &&
1477 !S.Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, MemberLoc))
1478 S.getCurFunction()->recordUseOfWeak(Result);
1479 }
1480
1481 return Result;
1482 }
1483
1484 // Objective-C property access.
1485 const ObjCObjectPointerType *OPT;
1486 if (!IsArrow
11.1
'IsArrow' is false
&& (OPT = BaseType->getAs<ObjCObjectPointerType>())) {
12
Assuming the object is not a 'ObjCObjectPointerType'
13
Assuming 'OPT' is null
14
Taking false branch
1487 if (!SS.isEmpty() && !SS.isInvalid()) {
1488 S.Diag(SS.getRange().getBegin(), diag::err_qualified_objc_access)
1489 << 0 << SS.getScopeRep() << FixItHint::CreateRemoval(SS.getRange());
1490 SS.clear();
1491 }
1492
1493 // This actually uses the base as an r-value.
1494 BaseExpr = S.DefaultLvalueConversion(BaseExpr.get());
1495 if (BaseExpr.isInvalid())
1496 return ExprError();
1497
1498 assert(S.Context.hasSameUnqualifiedType(BaseType,((S.Context.hasSameUnqualifiedType(BaseType, BaseExpr.get()->
getType())) ? static_cast<void> (0) : __assert_fail ("S.Context.hasSameUnqualifiedType(BaseType, BaseExpr.get()->getType())"
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 1499, __PRETTY_FUNCTION__))
1499 BaseExpr.get()->getType()))((S.Context.hasSameUnqualifiedType(BaseType, BaseExpr.get()->
getType())) ? static_cast<void> (0) : __assert_fail ("S.Context.hasSameUnqualifiedType(BaseType, BaseExpr.get()->getType())"
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 1499, __PRETTY_FUNCTION__))
;
1500
1501 IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
1502
1503 const ObjCObjectType *OT = OPT->getObjectType();
1504
1505 // id, with and without qualifiers.
1506 if (OT->isObjCId()) {
1507 // Check protocols on qualified interfaces.
1508 Selector Sel = S.PP.getSelectorTable().getNullarySelector(Member);
1509 if (Decl *PMDecl =
1510 FindGetterSetterNameDecl(OPT, Member, Sel, S.Context)) {
1511 if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) {
1512 // Check the use of this declaration
1513 if (S.DiagnoseUseOfDecl(PD, MemberLoc))
1514 return ExprError();
1515
1516 return new (S.Context)
1517 ObjCPropertyRefExpr(PD, S.Context.PseudoObjectTy, VK_LValue,
1518 OK_ObjCProperty, MemberLoc, BaseExpr.get());
1519 }
1520
1521 if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) {
1522 Selector SetterSel =
1523 SelectorTable::constructSetterSelector(S.PP.getIdentifierTable(),
1524 S.PP.getSelectorTable(),
1525 Member);
1526 ObjCMethodDecl *SMD = nullptr;
1527 if (Decl *SDecl = FindGetterSetterNameDecl(OPT,
1528 /*Property id*/ nullptr,
1529 SetterSel, S.Context))
1530 SMD = dyn_cast<ObjCMethodDecl>(SDecl);
1531
1532 return new (S.Context)
1533 ObjCPropertyRefExpr(OMD, SMD, S.Context.PseudoObjectTy, VK_LValue,
1534 OK_ObjCProperty, MemberLoc, BaseExpr.get());
1535 }
1536 }
1537 // Use of id.member can only be for a property reference. Do not
1538 // use the 'id' redefinition in this case.
1539 if (IsArrow && ShouldTryAgainWithRedefinitionType(S, BaseExpr))
1540 return LookupMemberExpr(S, R, BaseExpr, IsArrow, OpLoc, SS,
1541 ObjCImpDecl, HasTemplateArgs, TemplateKWLoc);
1542
1543 return ExprError(S.Diag(MemberLoc, diag::err_property_not_found)
1544 << MemberName << BaseType);
1545 }
1546
1547 // 'Class', unqualified only.
1548 if (OT->isObjCClass()) {
1549 // Only works in a method declaration (??!).
1550 ObjCMethodDecl *MD = S.getCurMethodDecl();
1551 if (!MD) {
1552 if (ShouldTryAgainWithRedefinitionType(S, BaseExpr))
1553 return LookupMemberExpr(S, R, BaseExpr, IsArrow, OpLoc, SS,
1554 ObjCImpDecl, HasTemplateArgs, TemplateKWLoc);
1555
1556 goto fail;
1557 }
1558
1559 // Also must look for a getter name which uses property syntax.
1560 Selector Sel = S.PP.getSelectorTable().getNullarySelector(Member);
1561 ObjCInterfaceDecl *IFace = MD->getClassInterface();
1562 if (!IFace)
1563 goto fail;
1564
1565 ObjCMethodDecl *Getter;
1566 if ((Getter = IFace->lookupClassMethod(Sel))) {
1567 // Check the use of this method.
1568 if (S.DiagnoseUseOfDecl(Getter, MemberLoc))
1569 return ExprError();
1570 } else
1571 Getter = IFace->lookupPrivateMethod(Sel, false);
1572 // If we found a getter then this may be a valid dot-reference, we
1573 // will look for the matching setter, in case it is needed.
1574 Selector SetterSel =
1575 SelectorTable::constructSetterSelector(S.PP.getIdentifierTable(),
1576 S.PP.getSelectorTable(),
1577 Member);
1578 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel);
1579 if (!Setter) {
1580 // If this reference is in an @implementation, also check for 'private'
1581 // methods.
1582 Setter = IFace->lookupPrivateMethod(SetterSel, false);
1583 }
1584
1585 if (Setter && S.DiagnoseUseOfDecl(Setter, MemberLoc))
1586 return ExprError();
1587
1588 if (Getter || Setter) {
1589 return new (S.Context) ObjCPropertyRefExpr(
1590 Getter, Setter, S.Context.PseudoObjectTy, VK_LValue,
1591 OK_ObjCProperty, MemberLoc, BaseExpr.get());
1592 }
1593
1594 if (ShouldTryAgainWithRedefinitionType(S, BaseExpr))
1595 return LookupMemberExpr(S, R, BaseExpr, IsArrow, OpLoc, SS,
1596 ObjCImpDecl, HasTemplateArgs, TemplateKWLoc);
1597
1598 return ExprError(S.Diag(MemberLoc, diag::err_property_not_found)
1599 << MemberName << BaseType);
1600 }
1601
1602 // Normal property access.
1603 return S.HandleExprPropertyRefExpr(OPT, BaseExpr.get(), OpLoc, MemberName,
1604 MemberLoc, SourceLocation(), QualType(),
1605 false);
1606 }
1607
1608 // Handle 'field access' to vectors, such as 'V.xx'.
1609 if (BaseType->isExtVectorType()) {
15
Taking true branch
1610 // FIXME: this expr should store IsArrow.
1611 IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
1612 ExprValueKind VK;
1613 if (IsArrow
15.1
'IsArrow' is false
)
16
Taking false branch
1614 VK = VK_LValue;
1615 else {
1616 if (PseudoObjectExpr *POE
17.1
'POE' is non-null
= dyn_cast<PseudoObjectExpr>(BaseExpr.get()))
17
Assuming the object is a 'PseudoObjectExpr'
18
Taking true branch
1617 VK = POE->getSyntacticForm()->getValueKind();
1618 else
1619 VK = BaseExpr.get()->getValueKind();
1620 }
1621
1622 QualType ret = CheckExtVectorComponent(S, BaseType, VK, OpLoc,
19
Calling 'CheckExtVectorComponent'
1623 Member, MemberLoc);
1624 if (ret.isNull())
1625 return ExprError();
1626 Qualifiers BaseQ =
1627 S.Context.getCanonicalType(BaseExpr.get()->getType()).getQualifiers();
1628 ret = S.Context.getQualifiedType(ret, BaseQ);
1629
1630 return new (S.Context)
1631 ExtVectorElementExpr(ret, VK, BaseExpr.get(), *Member, MemberLoc);
1632 }
1633
1634 // Adjust builtin-sel to the appropriate redefinition type if that's
1635 // not just a pointer to builtin-sel again.
1636 if (IsArrow && BaseType->isSpecificBuiltinType(BuiltinType::ObjCSel) &&
1637 !S.Context.getObjCSelRedefinitionType()->isObjCSelType()) {
1638 BaseExpr = S.ImpCastExprToType(
1639 BaseExpr.get(), S.Context.getObjCSelRedefinitionType(), CK_BitCast);
1640 return LookupMemberExpr(S, R, BaseExpr, IsArrow, OpLoc, SS,
1641 ObjCImpDecl, HasTemplateArgs, TemplateKWLoc);
1642 }
1643
1644 // Failure cases.
1645 fail:
1646
1647 // Recover from dot accesses to pointers, e.g.:
1648 // type *foo;
1649 // foo.bar
1650 // This is actually well-formed in two cases:
1651 // - 'type' is an Objective C type
1652 // - 'bar' is a pseudo-destructor name which happens to refer to
1653 // the appropriate pointer type
1654 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) {
1655 if (!IsArrow && Ptr->getPointeeType()->isRecordType() &&
1656 MemberName.getNameKind() != DeclarationName::CXXDestructorName) {
1657 S.Diag(OpLoc, diag::err_typecheck_member_reference_suggestion)
1658 << BaseType << int(IsArrow) << BaseExpr.get()->getSourceRange()
1659 << FixItHint::CreateReplacement(OpLoc, "->");
1660
1661 // Recurse as an -> access.
1662 IsArrow = true;
1663 return LookupMemberExpr(S, R, BaseExpr, IsArrow, OpLoc, SS,
1664 ObjCImpDecl, HasTemplateArgs, TemplateKWLoc);
1665 }
1666 }
1667
1668 // If the user is trying to apply -> or . to a function name, it's probably
1669 // because they forgot parentheses to call that function.
1670 if (S.tryToRecoverWithCall(
1671 BaseExpr, S.PDiag(diag::err_member_reference_needs_call),
1672 /*complain*/ false,
1673 IsArrow ? &isPointerToRecordType : &isRecordType)) {
1674 if (BaseExpr.isInvalid())
1675 return ExprError();
1676 BaseExpr = S.DefaultFunctionArrayConversion(BaseExpr.get());
1677 return LookupMemberExpr(S, R, BaseExpr, IsArrow, OpLoc, SS,
1678 ObjCImpDecl, HasTemplateArgs, TemplateKWLoc);
1679 }
1680
1681 S.Diag(OpLoc, diag::err_typecheck_member_reference_struct_union)
1682 << BaseType << BaseExpr.get()->getSourceRange() << MemberLoc;
1683
1684 return ExprError();
1685}
1686
1687/// The main callback when the parser finds something like
1688/// expression . [nested-name-specifier] identifier
1689/// expression -> [nested-name-specifier] identifier
1690/// where 'identifier' encompasses a fairly broad spectrum of
1691/// possibilities, including destructor and operator references.
1692///
1693/// \param OpKind either tok::arrow or tok::period
1694/// \param ObjCImpDecl the current Objective-C \@implementation
1695/// decl; this is an ugly hack around the fact that Objective-C
1696/// \@implementations aren't properly put in the context chain
1697ExprResult Sema::ActOnMemberAccessExpr(Scope *S, Expr *Base,
1698 SourceLocation OpLoc,
1699 tok::TokenKind OpKind,
1700 CXXScopeSpec &SS,
1701 SourceLocation TemplateKWLoc,
1702 UnqualifiedId &Id,
1703 Decl *ObjCImpDecl) {
1704 if (SS.isSet() && SS.isInvalid())
1705 return ExprError();
1706
1707 // Warn about the explicit constructor calls Microsoft extension.
1708 if (getLangOpts().MicrosoftExt &&
1709 Id.getKind() == UnqualifiedIdKind::IK_ConstructorName)
1710 Diag(Id.getSourceRange().getBegin(),
1711 diag::ext_ms_explicit_constructor_call);
1712
1713 TemplateArgumentListInfo TemplateArgsBuffer;
1714
1715 // Decompose the name into its component parts.
1716 DeclarationNameInfo NameInfo;
1717 const TemplateArgumentListInfo *TemplateArgs;
1718 DecomposeUnqualifiedId(Id, TemplateArgsBuffer,
1719 NameInfo, TemplateArgs);
1720
1721 DeclarationName Name = NameInfo.getName();
1722 bool IsArrow = (OpKind == tok::arrow);
1723
1724 NamedDecl *FirstQualifierInScope
1725 = (!SS.isSet() ? nullptr : FindFirstQualifierInScope(S, SS.getScopeRep()));
1726
1727 // This is a postfix expression, so get rid of ParenListExprs.
1728 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Base);
1729 if (Result.isInvalid()) return ExprError();
1730 Base = Result.get();
1731
1732 if (Base->getType()->isDependentType() || Name.isDependentName() ||
1733 isDependentScopeSpecifier(SS)) {
1734 return ActOnDependentMemberExpr(Base, Base->getType(), IsArrow, OpLoc, SS,
1735 TemplateKWLoc, FirstQualifierInScope,
1736 NameInfo, TemplateArgs);
1737 }
1738
1739 ActOnMemberAccessExtraArgs ExtraArgs = {S, Id, ObjCImpDecl};
1740 ExprResult Res = BuildMemberReferenceExpr(
1741 Base, Base->getType(), OpLoc, IsArrow, SS, TemplateKWLoc,
1742 FirstQualifierInScope, NameInfo, TemplateArgs, S, &ExtraArgs);
1743
1744 if (!Res.isInvalid() && isa<MemberExpr>(Res.get()))
1745 CheckMemberAccessOfNoDeref(cast<MemberExpr>(Res.get()));
1746
1747 return Res;
1748}
1749
1750void Sema::CheckMemberAccessOfNoDeref(const MemberExpr *E) {
1751 QualType ResultTy = E->getType();
1752
1753 // Do not warn on member accesses to arrays since this returns an array
1754 // lvalue and does not actually dereference memory.
1755 if (isa<ArrayType>(ResultTy))
1756 return;
1757
1758 if (E->isArrow()) {
1759 if (const auto *Ptr = dyn_cast<PointerType>(
1760 E->getBase()->getType().getDesugaredType(Context))) {
1761 if (Ptr->getPointeeType()->hasAttr(attr::NoDeref))
1762 ExprEvalContexts.back().PossibleDerefs.insert(E);
1763 }
1764 }
1765}
1766
1767ExprResult
1768Sema::BuildFieldReferenceExpr(Expr *BaseExpr, bool IsArrow,
1769 SourceLocation OpLoc, const CXXScopeSpec &SS,
1770 FieldDecl *Field, DeclAccessPair FoundDecl,
1771 const DeclarationNameInfo &MemberNameInfo) {
1772 // x.a is an l-value if 'a' has a reference type. Otherwise:
1773 // x.a is an l-value/x-value/pr-value if the base is (and note
1774 // that *x is always an l-value), except that if the base isn't
1775 // an ordinary object then we must have an rvalue.
1776 ExprValueKind VK = VK_LValue;
1777 ExprObjectKind OK = OK_Ordinary;
1778 if (!IsArrow) {
1779 if (BaseExpr->getObjectKind() == OK_Ordinary)
1780 VK = BaseExpr->getValueKind();
1781 else
1782 VK = VK_RValue;
1783 }
1784 if (VK != VK_RValue && Field->isBitField())
1785 OK = OK_BitField;
1786
1787 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref]
1788 QualType MemberType = Field->getType();
1789 if (const ReferenceType *Ref = MemberType->getAs<ReferenceType>()) {
1790 MemberType = Ref->getPointeeType();
1791 VK = VK_LValue;
1792 } else {
1793 QualType BaseType = BaseExpr->getType();
1794 if (IsArrow) BaseType = BaseType->getAs<PointerType>()->getPointeeType();
1795
1796 Qualifiers BaseQuals = BaseType.getQualifiers();
1797
1798 // GC attributes are never picked up by members.
1799 BaseQuals.removeObjCGCAttr();
1800
1801 // CVR attributes from the base are picked up by members,
1802 // except that 'mutable' members don't pick up 'const'.
1803 if (Field->isMutable()) BaseQuals.removeConst();
1804
1805 Qualifiers MemberQuals =
1806 Context.getCanonicalType(MemberType).getQualifiers();
1807
1808 assert(!MemberQuals.hasAddressSpace())((!MemberQuals.hasAddressSpace()) ? static_cast<void> (
0) : __assert_fail ("!MemberQuals.hasAddressSpace()", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 1808, __PRETTY_FUNCTION__))
;
1809
1810 Qualifiers Combined = BaseQuals + MemberQuals;
1811 if (Combined != MemberQuals)
1812 MemberType = Context.getQualifiedType(MemberType, Combined);
1813 }
1814
1815 auto *CurMethod = dyn_cast<CXXMethodDecl>(CurContext);
1816 if (!(CurMethod && CurMethod->isDefaulted()))
1817 UnusedPrivateFields.remove(Field);
1818
1819 ExprResult Base = PerformObjectMemberConversion(BaseExpr, SS.getScopeRep(),
1820 FoundDecl, Field);
1821 if (Base.isInvalid())
1822 return ExprError();
1823
1824 // Build a reference to a private copy for non-static data members in
1825 // non-static member functions, privatized by OpenMP constructs.
1826 if (getLangOpts().OpenMP && IsArrow &&
1827 !CurContext->isDependentContext() &&
1828 isa<CXXThisExpr>(Base.get()->IgnoreParenImpCasts())) {
1829 if (auto *PrivateCopy = isOpenMPCapturedDecl(Field)) {
1830 return getOpenMPCapturedExpr(PrivateCopy, VK, OK,
1831 MemberNameInfo.getLoc());
1832 }
1833 }
1834
1835 return BuildMemberExpr(Base.get(), IsArrow, OpLoc, &SS,
1836 /*TemplateKWLoc=*/SourceLocation(), Field, FoundDecl,
1837 /*HadMultipleCandidates=*/false, MemberNameInfo,
1838 MemberType, VK, OK);
1839}
1840
1841/// Builds an implicit member access expression. The current context
1842/// is known to be an instance method, and the given unqualified lookup
1843/// set is known to contain only instance members, at least one of which
1844/// is from an appropriate type.
1845ExprResult
1846Sema::BuildImplicitMemberExpr(const CXXScopeSpec &SS,
1847 SourceLocation TemplateKWLoc,
1848 LookupResult &R,
1849 const TemplateArgumentListInfo *TemplateArgs,
1850 bool IsKnownInstance, const Scope *S) {
1851 assert(!R.empty() && !R.isAmbiguous())((!R.empty() && !R.isAmbiguous()) ? static_cast<void
> (0) : __assert_fail ("!R.empty() && !R.isAmbiguous()"
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 1851, __PRETTY_FUNCTION__))
;
1852
1853 SourceLocation loc = R.getNameLoc();
1854
1855 // If this is known to be an instance access, go ahead and build an
1856 // implicit 'this' expression now.
1857 // 'this' expression now.
1858 QualType ThisTy = getCurrentThisType();
1859 assert(!ThisTy.isNull() && "didn't correctly pre-flight capture of 'this'")((!ThisTy.isNull() && "didn't correctly pre-flight capture of 'this'"
) ? static_cast<void> (0) : __assert_fail ("!ThisTy.isNull() && \"didn't correctly pre-flight capture of 'this'\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaExprMember.cpp"
, 1859, __PRETTY_FUNCTION__))
;
1860
1861 Expr *baseExpr = nullptr; // null signifies implicit access
1862 if (IsKnownInstance) {
1863 SourceLocation Loc = R.getNameLoc();
1864 if (SS.getRange().isValid())
1865 Loc = SS.getRange().getBegin();
1866 baseExpr = BuildCXXThisExpr(loc, ThisTy, /*IsImplicit=*/true);
1867 }
1868
1869 return BuildMemberReferenceExpr(baseExpr, ThisTy,
1870 /*OpLoc*/ SourceLocation(),
1871 /*IsArrow*/ true,
1872 SS, TemplateKWLoc,
1873 /*FirstQualifierInScope*/ nullptr,
1874 R, TemplateArgs, S);
1875}