Bug Summary

File:clang/lib/Sema/SemaExprMember.cpp
Warning:line 409, column 12
Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -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 -fhalf-no-semantic-interposition -mframe-pointer=none -relaxed-aliasing -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -ffunction-sections -fdata-sections -fcoverage-compilation-dir=/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/build-llvm/tools/clang/lib/Sema -resource-dir /usr/lib/llvm-13/lib/clang/13.0.0 -D CLANG_ROUND_TRIP_CC1_ARGS=ON -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/build-llvm/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/clang/lib/Sema -I /build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/clang/include -I /build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/build-llvm/include -I /build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/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/c++/6.3.0/backward -internal-isystem /usr/lib/llvm-13/lib/clang/13.0.0/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../x86_64-linux-gnu/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-13~++20210413100635+64c24f493e5f/build-llvm/tools/clang/lib/Sema -fdebug-prefix-map=/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f=. -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2021-04-14-063029-18377-1 -x c++ /build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/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-13~++20210413100635+64c24f493e5f/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-13~++20210413100635+64c24f493e5f/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 Sema::BuildPossibleImplicitMemberExpr(
235 const CXXScopeSpec &SS, SourceLocation TemplateKWLoc, LookupResult &R,
236 const TemplateArgumentListInfo *TemplateArgs, const Scope *S,
237 UnresolvedLookupExpr *AsULE) {
238 switch (ClassifyImplicitMemberAccess(*this, R)) {
239 case IMA_Instance:
240 return BuildImplicitMemberExpr(SS, TemplateKWLoc, R, TemplateArgs, true, S);
241
242 case IMA_Mixed:
243 case IMA_Mixed_Unrelated:
244 case IMA_Unresolved:
245 return BuildImplicitMemberExpr(SS, TemplateKWLoc, R, TemplateArgs, false,
246 S);
247
248 case IMA_Field_Uneval_Context:
249 Diag(R.getNameLoc(), diag::warn_cxx98_compat_non_static_member_use)
250 << R.getLookupNameInfo().getName();
251 LLVM_FALLTHROUGH[[gnu::fallthrough]];
252 case IMA_Static:
253 case IMA_Abstract:
254 case IMA_Mixed_StaticContext:
255 case IMA_Unresolved_StaticContext:
256 if (TemplateArgs || TemplateKWLoc.isValid())
257 return BuildTemplateIdExpr(SS, TemplateKWLoc, R, false, TemplateArgs);
258 return AsULE ? AsULE : BuildDeclarationNameExpr(SS, R, false);
259
260 case IMA_Error_StaticContext:
261 case IMA_Error_Unrelated:
262 diagnoseInstanceReference(*this, SS, R.getRepresentativeDecl(),
263 R.getLookupNameInfo());
264 return ExprError();
265 }
266
267 llvm_unreachable("unexpected instance member access kind")::llvm::llvm_unreachable_internal("unexpected instance member access kind"
, "/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/clang/lib/Sema/SemaExprMember.cpp"
, 267)
;
268}
269
270/// Determine whether input char is from rgba component set.
271static bool
272IsRGBA(char c) {
273 switch (c) {
274 case 'r':
275 case 'g':
276 case 'b':
277 case 'a':
278 return true;
279 default:
280 return false;
281 }
282}
283
284// OpenCL v1.1, s6.1.7
285// The component swizzle length must be in accordance with the acceptable
286// vector sizes.
287static bool IsValidOpenCLComponentSwizzleLength(unsigned len)
288{
289 return (len >= 1 && len <= 4) || len == 8 || len == 16;
290}
291
292/// Check an ext-vector component access expression.
293///
294/// VK should be set in advance to the value kind of the base
295/// expression.
296static QualType
297CheckExtVectorComponent(Sema &S, QualType baseType, ExprValueKind &VK,
298 SourceLocation OpLoc, const IdentifierInfo *CompName,
299 SourceLocation CompLoc) {
300 // FIXME: Share logic with ExtVectorElementExpr::containsDuplicateElements,
301 // see FIXME there.
302 //
303 // FIXME: This logic can be greatly simplified by splitting it along
304 // halving/not halving and reworking the component checking.
305 const ExtVectorType *vecType = baseType->getAs<ExtVectorType>();
20
Assuming the object is not a 'ExtVectorType'
21
'vecType' initialized to a null pointer value
306
307 // The vector accessor can't exceed the number of elements.
308 const char *compStr = CompName->getNameStart();
309
310 // This flag determines whether or not the component is one of the four
311 // special names that indicate a subset of exactly half the elements are
312 // to be selected.
313 bool HalvingSwizzle = false;
314
315 // This flag determines whether or not CompName has an 's' char prefix,
316 // indicating that it is a string of hex values to be used as vector indices.
317 bool HexSwizzle = (*compStr == 's' || *compStr == 'S') && compStr[1];
22
Assuming the condition is false
23
Assuming the condition is false
318
319 bool HasRepeated = false;
320 bool HasIndex[16] = {};
321
322 int Idx;
323
324 // Check that we've found one of the special components, or that the component
325 // names must come from the same set.
326 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") ||
24
Assuming the condition is false
25
Assuming the condition is false
28
Taking false branch
327 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) {
26
Assuming the condition is false
27
Assuming the condition is false
328 HalvingSwizzle = true;
329 } else if (!HexSwizzle
28.1
'HexSwizzle' is false
&&
29
Taking false branch
330 (Idx = vecType->getPointAccessorIdx(*compStr)) != -1) {
331 bool HasRGBA = IsRGBA(*compStr);
332 do {
333 // Ensure that xyzw and rgba components don't intermingle.
334 if (HasRGBA != IsRGBA(*compStr))
335 break;
336 if (HasIndex[Idx]) HasRepeated = true;
337 HasIndex[Idx] = true;
338 compStr++;
339 } while (*compStr && (Idx = vecType->getPointAccessorIdx(*compStr)) != -1);
340
341 // Emit a warning if an rgba selector is used earlier than OpenCL C 3.0.
342 if (HasRGBA || (*compStr && IsRGBA(*compStr))) {
343 if (S.getLangOpts().OpenCL && S.getLangOpts().OpenCLVersion < 300) {
344 const char *DiagBegin = HasRGBA ? CompName->getNameStart() : compStr;
345 S.Diag(OpLoc, diag::ext_opencl_ext_vector_type_rgba_selector)
346 << StringRef(DiagBegin, 1) << SourceRange(CompLoc);
347 }
348 }
349 } else {
350 if (HexSwizzle
29.1
'HexSwizzle' is false
) compStr++;
30
Taking false branch
351 while ((Idx = vecType->getNumericAccessorIdx(*compStr)) != -1) {
31
Loop condition is false. Execution continues on line 358
352 if (HasIndex[Idx]) HasRepeated = true;
353 HasIndex[Idx] = true;
354 compStr++;
355 }
356 }
357
358 if (!HalvingSwizzle
31.1
'HalvingSwizzle' is false
&& *compStr) {
32
Assuming the condition is false
33
Taking false branch
359 // We didn't get to the end of the string. This means the component names
360 // didn't come from the same set *or* we encountered an illegal name.
361 S.Diag(OpLoc, diag::err_ext_vector_component_name_illegal)
362 << StringRef(compStr, 1) << SourceRange(CompLoc);
363 return QualType();
364 }
365
366 // Ensure no component accessor exceeds the width of the vector type it
367 // operates on.
368 if (!HalvingSwizzle
33.1
'HalvingSwizzle' is false
) {
34
Taking true branch
369 compStr = CompName->getNameStart();
370
371 if (HexSwizzle
34.1
'HexSwizzle' is false
)
35
Taking false branch
372 compStr++;
373
374 while (*compStr) {
36
Loop condition is false. Execution continues on line 385
375 if (!vecType->isAccessorWithinNumElements(*compStr++, HexSwizzle)) {
376 S.Diag(OpLoc, diag::err_ext_vector_component_exceeds_length)
377 << baseType << SourceRange(CompLoc);
378 return QualType();
379 }
380 }
381 }
382
383 // OpenCL mode requires swizzle length to be in accordance with accepted
384 // sizes. Clang however supports arbitrary lengths for other languages.
385 if (S.getLangOpts().OpenCL && !HalvingSwizzle) {
37
Assuming field 'OpenCL' is 0
386 unsigned SwizzleLength = CompName->getLength();
387
388 if (HexSwizzle)
389 SwizzleLength--;
390
391 if (IsValidOpenCLComponentSwizzleLength(SwizzleLength) == false) {
392 S.Diag(OpLoc, diag::err_opencl_ext_vector_component_invalid_length)
393 << SwizzleLength << SourceRange(CompLoc);
394 return QualType();
395 }
396 }
397
398 // The component accessor looks fine - now we need to compute the actual type.
399 // The vector type is implied by the component accessor. For example,
400 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc.
401 // vec4.s0 is a float, vec4.s23 is a vec3, etc.
402 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2.
403 unsigned CompSize = HalvingSwizzle
37.1
'HalvingSwizzle' is false
? (vecType->getNumElements() + 1) / 2
38
'?' condition is false
404 : CompName->getLength();
405 if (HexSwizzle
38.1
'HexSwizzle' is false
)
39
Taking false branch
406 CompSize--;
407
408 if (CompSize == 1)
40
Assuming 'CompSize' is equal to 1
41
Taking true branch
409 return vecType->getElementType();
42
Called C++ object pointer is null
410
411 if (HasRepeated) VK = VK_RValue;
412
413 QualType VT = S.Context.getExtVectorType(vecType->getElementType(), CompSize);
414 // Now look up the TypeDefDecl from the vector type. Without this,
415 // diagostics look bad. We want extended vector types to appear built-in.
416 for (Sema::ExtVectorDeclsType::iterator
417 I = S.ExtVectorDecls.begin(S.getExternalSource()),
418 E = S.ExtVectorDecls.end();
419 I != E; ++I) {
420 if ((*I)->getUnderlyingType() == VT)
421 return S.Context.getTypedefType(*I);
422 }
423
424 return VT; // should never get here (a typedef type should always be found).
425}
426
427static Decl *FindGetterSetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl,
428 IdentifierInfo *Member,
429 const Selector &Sel,
430 ASTContext &Context) {
431 if (Member)
432 if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(
433 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance))
434 return PD;
435 if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Sel))
436 return OMD;
437
438 for (const auto *I : PDecl->protocols()) {
439 if (Decl *D = FindGetterSetterNameDeclFromProtocolList(I, Member, Sel,
440 Context))
441 return D;
442 }
443 return nullptr;
444}
445
446static Decl *FindGetterSetterNameDecl(const ObjCObjectPointerType *QIdTy,
447 IdentifierInfo *Member,
448 const Selector &Sel,
449 ASTContext &Context) {
450 // Check protocols on qualified interfaces.
451 Decl *GDecl = nullptr;
452 for (const auto *I : QIdTy->quals()) {
453 if (Member)
454 if (ObjCPropertyDecl *PD = I->FindPropertyDeclaration(
455 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) {
456 GDecl = PD;
457 break;
458 }
459 // Also must look for a getter or setter name which uses property syntax.
460 if (ObjCMethodDecl *OMD = I->getInstanceMethod(Sel)) {
461 GDecl = OMD;
462 break;
463 }
464 }
465 if (!GDecl) {
466 for (const auto *I : QIdTy->quals()) {
467 // Search in the protocol-qualifier list of current protocol.
468 GDecl = FindGetterSetterNameDeclFromProtocolList(I, Member, Sel, Context);
469 if (GDecl)
470 return GDecl;
471 }
472 }
473 return GDecl;
474}
475
476ExprResult
477Sema::ActOnDependentMemberExpr(Expr *BaseExpr, QualType BaseType,
478 bool IsArrow, SourceLocation OpLoc,
479 const CXXScopeSpec &SS,
480 SourceLocation TemplateKWLoc,
481 NamedDecl *FirstQualifierInScope,
482 const DeclarationNameInfo &NameInfo,
483 const TemplateArgumentListInfo *TemplateArgs) {
484 // Even in dependent contexts, try to diagnose base expressions with
485 // obviously wrong types, e.g.:
486 //
487 // T* t;
488 // t.f;
489 //
490 // In Obj-C++, however, the above expression is valid, since it could be
491 // accessing the 'f' property if T is an Obj-C interface. The extra check
492 // allows this, while still reporting an error if T is a struct pointer.
493 if (!IsArrow) {
494 const PointerType *PT = BaseType->getAs<PointerType>();
495 if (PT && (!getLangOpts().ObjC ||
496 PT->getPointeeType()->isRecordType())) {
497 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-13~++20210413100635+64c24f493e5f/clang/lib/Sema/SemaExprMember.cpp"
, 497, __PRETTY_FUNCTION__))
;
498 Diag(OpLoc, diag::err_typecheck_member_reference_struct_union)
499 << BaseType << BaseExpr->getSourceRange() << NameInfo.getSourceRange();
500 return ExprError();
501 }
502 }
503
504 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-13~++20210413100635+64c24f493e5f/clang/lib/Sema/SemaExprMember.cpp"
, 506, __PRETTY_FUNCTION__))
505 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-13~++20210413100635+64c24f493e5f/clang/lib/Sema/SemaExprMember.cpp"
, 506, __PRETTY_FUNCTION__))
506 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-13~++20210413100635+64c24f493e5f/clang/lib/Sema/SemaExprMember.cpp"
, 506, __PRETTY_FUNCTION__))
;
507
508 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr
509 // must have pointer type, and the accessed type is the pointee.
510 return CXXDependentScopeMemberExpr::Create(
511 Context, BaseExpr, BaseType, IsArrow, OpLoc,
512 SS.getWithLocInContext(Context), TemplateKWLoc, FirstQualifierInScope,
513 NameInfo, TemplateArgs);
514}
515
516/// We know that the given qualified member reference points only to
517/// declarations which do not belong to the static type of the base
518/// expression. Diagnose the problem.
519static void DiagnoseQualifiedMemberReference(Sema &SemaRef,
520 Expr *BaseExpr,
521 QualType BaseType,
522 const CXXScopeSpec &SS,
523 NamedDecl *rep,
524 const DeclarationNameInfo &nameInfo) {
525 // If this is an implicit member access, use a different set of
526 // diagnostics.
527 if (!BaseExpr)
528 return diagnoseInstanceReference(SemaRef, SS, rep, nameInfo);
529
530 SemaRef.Diag(nameInfo.getLoc(), diag::err_qualified_member_of_unrelated)
531 << SS.getRange() << rep << BaseType;
532}
533
534// Check whether the declarations we found through a nested-name
535// specifier in a member expression are actually members of the base
536// type. The restriction here is:
537//
538// C++ [expr.ref]p2:
539// ... In these cases, the id-expression shall name a
540// member of the class or of one of its base classes.
541//
542// So it's perfectly legitimate for the nested-name specifier to name
543// an unrelated class, and for us to find an overload set including
544// decls from classes which are not superclasses, as long as the decl
545// we actually pick through overload resolution is from a superclass.
546bool Sema::CheckQualifiedMemberReference(Expr *BaseExpr,
547 QualType BaseType,
548 const CXXScopeSpec &SS,
549 const LookupResult &R) {
550 CXXRecordDecl *BaseRecord =
551 cast_or_null<CXXRecordDecl>(computeDeclContext(BaseType));
552 if (!BaseRecord) {
553 // We can't check this yet because the base type is still
554 // dependent.
555 assert(BaseType->isDependentType())((BaseType->isDependentType()) ? static_cast<void> (
0) : __assert_fail ("BaseType->isDependentType()", "/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/clang/lib/Sema/SemaExprMember.cpp"
, 555, __PRETTY_FUNCTION__))
;
556 return false;
557 }
558
559 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
560 // If this is an implicit member reference and we find a
561 // non-instance member, it's not an error.
562 if (!BaseExpr && !(*I)->isCXXInstanceMember())
563 return false;
564
565 // Note that we use the DC of the decl, not the underlying decl.
566 DeclContext *DC = (*I)->getDeclContext();
567 while (DC->isTransparentContext())
568 DC = DC->getParent();
569
570 if (!DC->isRecord())
571 continue;
572
573 CXXRecordDecl *MemberRecord = cast<CXXRecordDecl>(DC)->getCanonicalDecl();
574 if (BaseRecord->getCanonicalDecl() == MemberRecord ||
575 !BaseRecord->isProvablyNotDerivedFrom(MemberRecord))
576 return false;
577 }
578
579 DiagnoseQualifiedMemberReference(*this, BaseExpr, BaseType, SS,
580 R.getRepresentativeDecl(),
581 R.getLookupNameInfo());
582 return true;
583}
584
585namespace {
586
587// Callback to only accept typo corrections that are either a ValueDecl or a
588// FunctionTemplateDecl and are declared in the current record or, for a C++
589// classes, one of its base classes.
590class RecordMemberExprValidatorCCC final : public CorrectionCandidateCallback {
591public:
592 explicit RecordMemberExprValidatorCCC(const RecordType *RTy)
593 : Record(RTy->getDecl()) {
594 // Don't add bare keywords to the consumer since they will always fail
595 // validation by virtue of not being associated with any decls.
596 WantTypeSpecifiers = false;
597 WantExpressionKeywords = false;
598 WantCXXNamedCasts = false;
599 WantFunctionLikeCasts = false;
600 WantRemainingKeywords = false;
601 }
602
603 bool ValidateCandidate(const TypoCorrection &candidate) override {
604 NamedDecl *ND = candidate.getCorrectionDecl();
605 // Don't accept candidates that cannot be member functions, constants,
606 // variables, or templates.
607 if (!ND || !(isa<ValueDecl>(ND) || isa<FunctionTemplateDecl>(ND)))
608 return false;
609
610 // Accept candidates that occur in the current record.
611 if (Record->containsDecl(ND))
612 return true;
613
614 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Record)) {
615 // Accept candidates that occur in any of the current class' base classes.
616 for (const auto &BS : RD->bases()) {
617 if (const RecordType *BSTy =
618 dyn_cast_or_null<RecordType>(BS.getType().getTypePtrOrNull())) {
619 if (BSTy->getDecl()->containsDecl(ND))
620 return true;
621 }
622 }
623 }
624
625 return false;
626 }
627
628 std::unique_ptr<CorrectionCandidateCallback> clone() override {
629 return std::make_unique<RecordMemberExprValidatorCCC>(*this);
630 }
631
632private:
633 const RecordDecl *const Record;
634};
635
636}
637
638static bool LookupMemberExprInRecord(Sema &SemaRef, LookupResult &R,
639 Expr *BaseExpr,
640 const RecordType *RTy,
641 SourceLocation OpLoc, bool IsArrow,
642 CXXScopeSpec &SS, bool HasTemplateArgs,
643 SourceLocation TemplateKWLoc,
644 TypoExpr *&TE) {
645 SourceRange BaseRange = BaseExpr ? BaseExpr->getSourceRange() : SourceRange();
646 RecordDecl *RDecl = RTy->getDecl();
647 if (!SemaRef.isThisOutsideMemberFunctionBody(QualType(RTy, 0)) &&
648 SemaRef.RequireCompleteType(OpLoc, QualType(RTy, 0),
649 diag::err_typecheck_incomplete_tag,
650 BaseRange))
651 return true;
652
653 if (HasTemplateArgs || TemplateKWLoc.isValid()) {
654 // LookupTemplateName doesn't expect these both to exist simultaneously.
655 QualType ObjectType = SS.isSet() ? QualType() : QualType(RTy, 0);
656
657 bool MOUS;
658 return SemaRef.LookupTemplateName(R, nullptr, SS, ObjectType, false, MOUS,
659 TemplateKWLoc);
660 }
661
662 DeclContext *DC = RDecl;
663 if (SS.isSet()) {
664 // If the member name was a qualified-id, look into the
665 // nested-name-specifier.
666 DC = SemaRef.computeDeclContext(SS, false);
667
668 if (SemaRef.RequireCompleteDeclContext(SS, DC)) {
669 SemaRef.Diag(SS.getRange().getEnd(), diag::err_typecheck_incomplete_tag)
670 << SS.getRange() << DC;
671 return true;
672 }
673
674 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-13~++20210413100635+64c24f493e5f/clang/lib/Sema/SemaExprMember.cpp"
, 674, __PRETTY_FUNCTION__))
;
675
676 if (!isa<TypeDecl>(DC)) {
677 SemaRef.Diag(R.getNameLoc(), diag::err_qualified_member_nonclass)
678 << DC << SS.getRange();
679 return true;
680 }
681 }
682
683 // The record definition is complete, now look up the member.
684 SemaRef.LookupQualifiedName(R, DC, SS);
685
686 if (!R.empty())
687 return false;
688
689 DeclarationName Typo = R.getLookupName();
690 SourceLocation TypoLoc = R.getNameLoc();
691
692 struct QueryState {
693 Sema &SemaRef;
694 DeclarationNameInfo NameInfo;
695 Sema::LookupNameKind LookupKind;
696 Sema::RedeclarationKind Redecl;
697 };
698 QueryState Q = {R.getSema(), R.getLookupNameInfo(), R.getLookupKind(),
699 R.redeclarationKind()};
700 RecordMemberExprValidatorCCC CCC(RTy);
701 TE = SemaRef.CorrectTypoDelayed(
702 R.getLookupNameInfo(), R.getLookupKind(), nullptr, &SS, CCC,
703 [=, &SemaRef](const TypoCorrection &TC) {
704 if (TC) {
705 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-13~++20210413100635+64c24f493e5f/clang/lib/Sema/SemaExprMember.cpp"
, 706, __PRETTY_FUNCTION__))
706 "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-13~++20210413100635+64c24f493e5f/clang/lib/Sema/SemaExprMember.cpp"
, 706, __PRETTY_FUNCTION__))
;
707 bool DroppedSpecifier =
708 TC.WillReplaceSpecifier() &&
709 Typo.getAsString() == TC.getAsString(SemaRef.getLangOpts());
710 SemaRef.diagnoseTypo(TC, SemaRef.PDiag(diag::err_no_member_suggest)
711 << Typo << DC << DroppedSpecifier
712 << SS.getRange());
713 } else {
714 SemaRef.Diag(TypoLoc, diag::err_no_member) << Typo << DC << BaseRange;
715 }
716 },
717 [=](Sema &SemaRef, TypoExpr *TE, TypoCorrection TC) mutable {
718 LookupResult R(Q.SemaRef, Q.NameInfo, Q.LookupKind, Q.Redecl);
719 R.clear(); // Ensure there's no decls lingering in the shared state.
720 R.suppressDiagnostics();
721 R.setLookupName(TC.getCorrection());
722 for (NamedDecl *ND : TC)
723 R.addDecl(ND);
724 R.resolveKind();
725 return SemaRef.BuildMemberReferenceExpr(
726 BaseExpr, BaseExpr->getType(), OpLoc, IsArrow, SS, SourceLocation(),
727 nullptr, R, nullptr, nullptr);
728 },
729 Sema::CTK_ErrorRecovery, DC);
730
731 return false;
732}
733
734static ExprResult LookupMemberExpr(Sema &S, LookupResult &R,
735 ExprResult &BaseExpr, bool &IsArrow,
736 SourceLocation OpLoc, CXXScopeSpec &SS,
737 Decl *ObjCImpDecl, bool HasTemplateArgs,
738 SourceLocation TemplateKWLoc);
739
740ExprResult
741Sema::BuildMemberReferenceExpr(Expr *Base, QualType BaseType,
742 SourceLocation OpLoc, bool IsArrow,
743 CXXScopeSpec &SS,
744 SourceLocation TemplateKWLoc,
745 NamedDecl *FirstQualifierInScope,
746 const DeclarationNameInfo &NameInfo,
747 const TemplateArgumentListInfo *TemplateArgs,
748 const Scope *S,
749 ActOnMemberAccessExtraArgs *ExtraArgs) {
750 if (BaseType->isDependentType() ||
751 (SS.isSet() && isDependentScopeSpecifier(SS)))
752 return ActOnDependentMemberExpr(Base, BaseType,
753 IsArrow, OpLoc,
754 SS, TemplateKWLoc, FirstQualifierInScope,
755 NameInfo, TemplateArgs);
756
757 LookupResult R(*this, NameInfo, LookupMemberName);
758
759 // Implicit member accesses.
760 if (!Base) {
761 TypoExpr *TE = nullptr;
762 QualType RecordTy = BaseType;
763 if (IsArrow) RecordTy = RecordTy->castAs<PointerType>()->getPointeeType();
764 if (LookupMemberExprInRecord(
765 *this, R, nullptr, RecordTy->getAs<RecordType>(), OpLoc, IsArrow,
766 SS, TemplateArgs != nullptr, TemplateKWLoc, TE))
767 return ExprError();
768 if (TE)
769 return TE;
770
771 // Explicit member accesses.
772 } else {
773 ExprResult BaseResult = Base;
774 ExprResult Result =
775 LookupMemberExpr(*this, R, BaseResult, IsArrow, OpLoc, SS,
776 ExtraArgs ? ExtraArgs->ObjCImpDecl : nullptr,
777 TemplateArgs != nullptr, TemplateKWLoc);
778
779 if (BaseResult.isInvalid())
780 return ExprError();
781 Base = BaseResult.get();
782
783 if (Result.isInvalid())
784 return ExprError();
785
786 if (Result.get())
787 return Result;
788
789 // LookupMemberExpr can modify Base, and thus change BaseType
790 BaseType = Base->getType();
791 }
792
793 return BuildMemberReferenceExpr(Base, BaseType,
794 OpLoc, IsArrow, SS, TemplateKWLoc,
795 FirstQualifierInScope, R, TemplateArgs, S,
796 false, ExtraArgs);
797}
798
799ExprResult
800Sema::BuildAnonymousStructUnionMemberReference(const CXXScopeSpec &SS,
801 SourceLocation loc,
802 IndirectFieldDecl *indirectField,
803 DeclAccessPair foundDecl,
804 Expr *baseObjectExpr,
805 SourceLocation opLoc) {
806 // First, build the expression that refers to the base object.
807
808 // Case 1: the base of the indirect field is not a field.
809 VarDecl *baseVariable = indirectField->getVarDecl();
810 CXXScopeSpec EmptySS;
811 if (baseVariable) {
812 assert(baseVariable->getType()->isRecordType())((baseVariable->getType()->isRecordType()) ? static_cast
<void> (0) : __assert_fail ("baseVariable->getType()->isRecordType()"
, "/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/clang/lib/Sema/SemaExprMember.cpp"
, 812, __PRETTY_FUNCTION__))
;
813
814 // In principle we could have a member access expression that
815 // accesses an anonymous struct/union that's a static member of
816 // the base object's class. However, under the current standard,
817 // static data members cannot be anonymous structs or unions.
818 // Supporting this is as easy as building a MemberExpr here.
819 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-13~++20210413100635+64c24f493e5f/clang/lib/Sema/SemaExprMember.cpp"
, 819, __PRETTY_FUNCTION__))
;
820
821 DeclarationNameInfo baseNameInfo(DeclarationName(), loc);
822
823 ExprResult result
824 = BuildDeclarationNameExpr(EmptySS, baseNameInfo, baseVariable);
825 if (result.isInvalid()) return ExprError();
826
827 baseObjectExpr = result.get();
828 }
829
830 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-13~++20210413100635+64c24f493e5f/clang/lib/Sema/SemaExprMember.cpp"
, 832, __PRETTY_FUNCTION__))
831 "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-13~++20210413100635+64c24f493e5f/clang/lib/Sema/SemaExprMember.cpp"
, 832, __PRETTY_FUNCTION__))
832 "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-13~++20210413100635+64c24f493e5f/clang/lib/Sema/SemaExprMember.cpp"
, 832, __PRETTY_FUNCTION__))
;
833
834 // Build the implicit member references to the field of the
835 // anonymous struct/union.
836 Expr *result = baseObjectExpr;
837 IndirectFieldDecl::chain_iterator
838 FI = indirectField->chain_begin(), FEnd = indirectField->chain_end();
839
840 // Case 2: the base of the indirect field is a field and the user
841 // wrote a member expression.
842 if (!baseVariable) {
843 FieldDecl *field = cast<FieldDecl>(*FI);
844
845 bool baseObjectIsPointer = baseObjectExpr->getType()->isPointerType();
846
847 // Make a nameInfo that properly uses the anonymous name.
848 DeclarationNameInfo memberNameInfo(field->getDeclName(), loc);
849
850 // Build the first member access in the chain with full information.
851 result =
852 BuildFieldReferenceExpr(result, baseObjectIsPointer, SourceLocation(),
853 SS, field, foundDecl, memberNameInfo)
854 .get();
855 if (!result)
856 return ExprError();
857 }
858
859 // In all cases, we should now skip the first declaration in the chain.
860 ++FI;
861
862 while (FI != FEnd) {
863 FieldDecl *field = cast<FieldDecl>(*FI++);
864
865 // FIXME: these are somewhat meaningless
866 DeclarationNameInfo memberNameInfo(field->getDeclName(), loc);
867 DeclAccessPair fakeFoundDecl =
868 DeclAccessPair::make(field, field->getAccess());
869
870 result =
871 BuildFieldReferenceExpr(result, /*isarrow*/ false, SourceLocation(),
872 (FI == FEnd ? SS : EmptySS), field,
873 fakeFoundDecl, memberNameInfo)
874 .get();
875 }
876
877 return result;
878}
879
880static ExprResult
881BuildMSPropertyRefExpr(Sema &S, Expr *BaseExpr, bool IsArrow,
882 const CXXScopeSpec &SS,
883 MSPropertyDecl *PD,
884 const DeclarationNameInfo &NameInfo) {
885 // Property names are always simple identifiers and therefore never
886 // require any interesting additional storage.
887 return new (S.Context) MSPropertyRefExpr(BaseExpr, PD, IsArrow,
888 S.Context.PseudoObjectTy, VK_LValue,
889 SS.getWithLocInContext(S.Context),
890 NameInfo.getLoc());
891}
892
893MemberExpr *Sema::BuildMemberExpr(
894 Expr *Base, bool IsArrow, SourceLocation OpLoc, const CXXScopeSpec *SS,
895 SourceLocation TemplateKWLoc, ValueDecl *Member, DeclAccessPair FoundDecl,
896 bool HadMultipleCandidates, const DeclarationNameInfo &MemberNameInfo,
897 QualType Ty, ExprValueKind VK, ExprObjectKind OK,
898 const TemplateArgumentListInfo *TemplateArgs) {
899 NestedNameSpecifierLoc NNS =
900 SS ? SS->getWithLocInContext(Context) : NestedNameSpecifierLoc();
901 return BuildMemberExpr(Base, IsArrow, OpLoc, NNS, TemplateKWLoc, Member,
902 FoundDecl, HadMultipleCandidates, MemberNameInfo, Ty,
903 VK, OK, TemplateArgs);
904}
905
906MemberExpr *Sema::BuildMemberExpr(
907 Expr *Base, bool IsArrow, SourceLocation OpLoc, NestedNameSpecifierLoc NNS,
908 SourceLocation TemplateKWLoc, ValueDecl *Member, DeclAccessPair FoundDecl,
909 bool HadMultipleCandidates, const DeclarationNameInfo &MemberNameInfo,
910 QualType Ty, ExprValueKind VK, ExprObjectKind OK,
911 const TemplateArgumentListInfo *TemplateArgs) {
912 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-13~++20210413100635+64c24f493e5f/clang/lib/Sema/SemaExprMember.cpp"
, 912, __PRETTY_FUNCTION__))
;
913 MemberExpr *E =
914 MemberExpr::Create(Context, Base, IsArrow, OpLoc, NNS, TemplateKWLoc,
915 Member, FoundDecl, MemberNameInfo, TemplateArgs, Ty,
916 VK, OK, getNonOdrUseReasonInCurrentContext(Member));
917 E->setHadMultipleCandidates(HadMultipleCandidates);
918 MarkMemberReferenced(E);
919
920 // C++ [except.spec]p17:
921 // An exception-specification is considered to be needed when:
922 // - in an expression the function is the unique lookup result or the
923 // selected member of a set of overloaded functions
924 if (auto *FPT = Ty->getAs<FunctionProtoType>()) {
925 if (isUnresolvedExceptionSpec(FPT->getExceptionSpecType())) {
926 if (auto *NewFPT = ResolveExceptionSpec(MemberNameInfo.getLoc(), FPT))
927 E->setType(Context.getQualifiedType(NewFPT, Ty.getQualifiers()));
928 }
929 }
930
931 return E;
932}
933
934/// Determine if the given scope is within a function-try-block handler.
935static bool IsInFnTryBlockHandler(const Scope *S) {
936 // Walk the scope stack until finding a FnTryCatchScope, or leave the
937 // function scope. If a FnTryCatchScope is found, check whether the TryScope
938 // flag is set. If it is not, it's a function-try-block handler.
939 for (; S != S->getFnParent(); S = S->getParent()) {
940 if (S->getFlags() & Scope::FnTryCatchScope)
941 return (S->getFlags() & Scope::TryScope) != Scope::TryScope;
942 }
943 return false;
944}
945
946ExprResult
947Sema::BuildMemberReferenceExpr(Expr *BaseExpr, QualType BaseExprType,
948 SourceLocation OpLoc, bool IsArrow,
949 const CXXScopeSpec &SS,
950 SourceLocation TemplateKWLoc,
951 NamedDecl *FirstQualifierInScope,
952 LookupResult &R,
953 const TemplateArgumentListInfo *TemplateArgs,
954 const Scope *S,
955 bool SuppressQualifierCheck,
956 ActOnMemberAccessExtraArgs *ExtraArgs) {
957 QualType BaseType = BaseExprType;
958 if (IsArrow) {
959 assert(BaseType->isPointerType())((BaseType->isPointerType()) ? static_cast<void> (0)
: __assert_fail ("BaseType->isPointerType()", "/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/clang/lib/Sema/SemaExprMember.cpp"
, 959, __PRETTY_FUNCTION__))
;
960 BaseType = BaseType->castAs<PointerType>()->getPointeeType();
961 }
962 R.setBaseObjectType(BaseType);
963
964 // C++1z [expr.ref]p2:
965 // For the first option (dot) the first expression shall be a glvalue [...]
966 if (!IsArrow && BaseExpr && BaseExpr->isRValue()) {
967 ExprResult Converted = TemporaryMaterializationConversion(BaseExpr);
968 if (Converted.isInvalid())
969 return ExprError();
970 BaseExpr = Converted.get();
971 }
972
973
974 const DeclarationNameInfo &MemberNameInfo = R.getLookupNameInfo();
975 DeclarationName MemberName = MemberNameInfo.getName();
976 SourceLocation MemberLoc = MemberNameInfo.getLoc();
977
978 if (R.isAmbiguous())
979 return ExprError();
980
981 // [except.handle]p10: Referring to any non-static member or base class of an
982 // object in the handler for a function-try-block of a constructor or
983 // destructor for that object results in undefined behavior.
984 const auto *FD = getCurFunctionDecl();
985 if (S && BaseExpr && FD &&
986 (isa<CXXDestructorDecl>(FD) || isa<CXXConstructorDecl>(FD)) &&
987 isa<CXXThisExpr>(BaseExpr->IgnoreImpCasts()) &&
988 IsInFnTryBlockHandler(S))
989 Diag(MemberLoc, diag::warn_cdtor_function_try_handler_mem_expr)
990 << isa<CXXDestructorDecl>(FD);
991
992 if (R.empty()) {
993 // Rederive where we looked up.
994 DeclContext *DC = (SS.isSet()
995 ? computeDeclContext(SS, false)
996 : BaseType->castAs<RecordType>()->getDecl());
997
998 if (ExtraArgs) {
999 ExprResult RetryExpr;
1000 if (!IsArrow && BaseExpr) {
1001 SFINAETrap Trap(*this, true);
1002 ParsedType ObjectType;
1003 bool MayBePseudoDestructor = false;
1004 RetryExpr = ActOnStartCXXMemberReference(getCurScope(), BaseExpr,
1005 OpLoc, tok::arrow, ObjectType,
1006 MayBePseudoDestructor);
1007 if (RetryExpr.isUsable() && !Trap.hasErrorOccurred()) {
1008 CXXScopeSpec TempSS(SS);
1009 RetryExpr = ActOnMemberAccessExpr(
1010 ExtraArgs->S, RetryExpr.get(), OpLoc, tok::arrow, TempSS,
1011 TemplateKWLoc, ExtraArgs->Id, ExtraArgs->ObjCImpDecl);
1012 }
1013 if (Trap.hasErrorOccurred())
1014 RetryExpr = ExprError();
1015 }
1016 if (RetryExpr.isUsable()) {
1017 Diag(OpLoc, diag::err_no_member_overloaded_arrow)
1018 << MemberName << DC << FixItHint::CreateReplacement(OpLoc, "->");
1019 return RetryExpr;
1020 }
1021 }
1022
1023 Diag(R.getNameLoc(), diag::err_no_member)
1024 << MemberName << DC
1025 << (BaseExpr ? BaseExpr->getSourceRange() : SourceRange());
1026 return ExprError();
1027 }
1028
1029 // Diagnose lookups that find only declarations from a non-base
1030 // type. This is possible for either qualified lookups (which may
1031 // have been qualified with an unrelated type) or implicit member
1032 // expressions (which were found with unqualified lookup and thus
1033 // may have come from an enclosing scope). Note that it's okay for
1034 // lookup to find declarations from a non-base type as long as those
1035 // aren't the ones picked by overload resolution.
1036 if ((SS.isSet() || !BaseExpr ||
1037 (isa<CXXThisExpr>(BaseExpr) &&
1038 cast<CXXThisExpr>(BaseExpr)->isImplicit())) &&
1039 !SuppressQualifierCheck &&
1040 CheckQualifiedMemberReference(BaseExpr, BaseType, SS, R))
1041 return ExprError();
1042
1043 // Construct an unresolved result if we in fact got an unresolved
1044 // result.
1045 if (R.isOverloadedResult() || R.isUnresolvableResult()) {
1046 // Suppress any lookup-related diagnostics; we'll do these when we
1047 // pick a member.
1048 R.suppressDiagnostics();
1049
1050 UnresolvedMemberExpr *MemExpr
1051 = UnresolvedMemberExpr::Create(Context, R.isUnresolvableResult(),
1052 BaseExpr, BaseExprType,
1053 IsArrow, OpLoc,
1054 SS.getWithLocInContext(Context),
1055 TemplateKWLoc, MemberNameInfo,
1056 TemplateArgs, R.begin(), R.end());
1057
1058 return MemExpr;
1059 }
1060
1061 assert(R.isSingleResult())((R.isSingleResult()) ? static_cast<void> (0) : __assert_fail
("R.isSingleResult()", "/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/clang/lib/Sema/SemaExprMember.cpp"
, 1061, __PRETTY_FUNCTION__))
;
1062 DeclAccessPair FoundDecl = R.begin().getPair();
1063 NamedDecl *MemberDecl = R.getFoundDecl();
1064
1065 // FIXME: diagnose the presence of template arguments now.
1066
1067 // If the decl being referenced had an error, return an error for this
1068 // sub-expr without emitting another error, in order to avoid cascading
1069 // error cases.
1070 if (MemberDecl->isInvalidDecl())
1071 return ExprError();
1072
1073 // Handle the implicit-member-access case.
1074 if (!BaseExpr) {
1075 // If this is not an instance member, convert to a non-member access.
1076 if (!MemberDecl->isCXXInstanceMember()) {
1077 // We might have a variable template specialization (or maybe one day a
1078 // member concept-id).
1079 if (TemplateArgs || TemplateKWLoc.isValid())
1080 return BuildTemplateIdExpr(SS, TemplateKWLoc, R, /*ADL*/false, TemplateArgs);
1081
1082 return BuildDeclarationNameExpr(SS, R.getLookupNameInfo(), MemberDecl,
1083 FoundDecl, TemplateArgs);
1084 }
1085 SourceLocation Loc = R.getNameLoc();
1086 if (SS.getRange().isValid())
1087 Loc = SS.getRange().getBegin();
1088 BaseExpr = BuildCXXThisExpr(Loc, BaseExprType, /*IsImplicit=*/true);
1089 }
1090
1091 // Check the use of this member.
1092 if (DiagnoseUseOfDecl(MemberDecl, MemberLoc))
1093 return ExprError();
1094
1095 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl))
1096 return BuildFieldReferenceExpr(BaseExpr, IsArrow, OpLoc, SS, FD, FoundDecl,
1097 MemberNameInfo);
1098
1099 if (MSPropertyDecl *PD = dyn_cast<MSPropertyDecl>(MemberDecl))
1100 return BuildMSPropertyRefExpr(*this, BaseExpr, IsArrow, SS, PD,
1101 MemberNameInfo);
1102
1103 if (IndirectFieldDecl *FD = dyn_cast<IndirectFieldDecl>(MemberDecl))
1104 // We may have found a field within an anonymous union or struct
1105 // (C++ [class.union]).
1106 return BuildAnonymousStructUnionMemberReference(SS, MemberLoc, FD,
1107 FoundDecl, BaseExpr,
1108 OpLoc);
1109
1110 if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) {
1111 return BuildMemberExpr(BaseExpr, IsArrow, OpLoc, &SS, TemplateKWLoc, Var,
1112 FoundDecl, /*HadMultipleCandidates=*/false,
1113 MemberNameInfo, Var->getType().getNonReferenceType(),
1114 VK_LValue, OK_Ordinary);
1115 }
1116
1117 if (CXXMethodDecl *MemberFn = dyn_cast<CXXMethodDecl>(MemberDecl)) {
1118 ExprValueKind valueKind;
1119 QualType type;
1120 if (MemberFn->isInstance()) {
1121 valueKind = VK_RValue;
1122 type = Context.BoundMemberTy;
1123 } else {
1124 valueKind = VK_LValue;
1125 type = MemberFn->getType();
1126 }
1127
1128 return BuildMemberExpr(BaseExpr, IsArrow, OpLoc, &SS, TemplateKWLoc,
1129 MemberFn, FoundDecl, /*HadMultipleCandidates=*/false,
1130 MemberNameInfo, type, valueKind, OK_Ordinary);
1131 }
1132 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-13~++20210413100635+64c24f493e5f/clang/lib/Sema/SemaExprMember.cpp"
, 1132, __PRETTY_FUNCTION__))
;
1133
1134 if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) {
1135 return BuildMemberExpr(BaseExpr, IsArrow, OpLoc, &SS, TemplateKWLoc, Enum,
1136 FoundDecl, /*HadMultipleCandidates=*/false,
1137 MemberNameInfo, Enum->getType(), VK_RValue,
1138 OK_Ordinary);
1139 }
1140
1141 if (VarTemplateDecl *VarTempl = dyn_cast<VarTemplateDecl>(MemberDecl)) {
1142 if (!TemplateArgs) {
1143 diagnoseMissingTemplateArguments(TemplateName(VarTempl), MemberLoc);
1144 return ExprError();
1145 }
1146
1147 DeclResult VDecl = CheckVarTemplateId(VarTempl, TemplateKWLoc,
1148 MemberNameInfo.getLoc(), *TemplateArgs);
1149 if (VDecl.isInvalid())
1150 return ExprError();
1151
1152 // Non-dependent member, but dependent template arguments.
1153 if (!VDecl.get())
1154 return ActOnDependentMemberExpr(
1155 BaseExpr, BaseExpr->getType(), IsArrow, OpLoc, SS, TemplateKWLoc,
1156 FirstQualifierInScope, MemberNameInfo, TemplateArgs);
1157
1158 VarDecl *Var = cast<VarDecl>(VDecl.get());
1159 if (!Var->getTemplateSpecializationKind())
1160 Var->setTemplateSpecializationKind(TSK_ImplicitInstantiation, MemberLoc);
1161
1162 return BuildMemberExpr(
1163 BaseExpr, IsArrow, OpLoc, &SS, TemplateKWLoc, Var, FoundDecl,
1164 /*HadMultipleCandidates=*/false, MemberNameInfo,
1165 Var->getType().getNonReferenceType(), VK_LValue, OK_Ordinary);
1166 }
1167
1168 // We found something that we didn't expect. Complain.
1169 if (isa<TypeDecl>(MemberDecl))
1170 Diag(MemberLoc, diag::err_typecheck_member_reference_type)
1171 << MemberName << BaseType << int(IsArrow);
1172 else
1173 Diag(MemberLoc, diag::err_typecheck_member_reference_unknown)
1174 << MemberName << BaseType << int(IsArrow);
1175
1176 Diag(MemberDecl->getLocation(), diag::note_member_declared_here)
1177 << MemberName;
1178 R.suppressDiagnostics();
1179 return ExprError();
1180}
1181
1182/// Given that normal member access failed on the given expression,
1183/// and given that the expression's type involves builtin-id or
1184/// builtin-Class, decide whether substituting in the redefinition
1185/// types would be profitable. The redefinition type is whatever
1186/// this translation unit tried to typedef to id/Class; we store
1187/// it to the side and then re-use it in places like this.
1188static bool ShouldTryAgainWithRedefinitionType(Sema &S, ExprResult &base) {
1189 const ObjCObjectPointerType *opty
1190 = base.get()->getType()->getAs<ObjCObjectPointerType>();
1191 if (!opty) return false;
1192
1193 const ObjCObjectType *ty = opty->getObjectType();
1194
1195 QualType redef;
1196 if (ty->isObjCId()) {
1197 redef = S.Context.getObjCIdRedefinitionType();
1198 } else if (ty->isObjCClass()) {
1199 redef = S.Context.getObjCClassRedefinitionType();
1200 } else {
1201 return false;
1202 }
1203
1204 // Do the substitution as long as the redefinition type isn't just a
1205 // possibly-qualified pointer to builtin-id or builtin-Class again.
1206 opty = redef->getAs<ObjCObjectPointerType>();
1207 if (opty && !opty->getObjectType()->getInterface())
1208 return false;
1209
1210 base = S.ImpCastExprToType(base.get(), redef, CK_BitCast);
1211 return true;
1212}
1213
1214static bool isRecordType(QualType T) {
1215 return T->isRecordType();
1216}
1217static bool isPointerToRecordType(QualType T) {
1218 if (const PointerType *PT = T->getAs<PointerType>())
1219 return PT->getPointeeType()->isRecordType();
1220 return false;
1221}
1222
1223/// Perform conversions on the LHS of a member access expression.
1224ExprResult
1225Sema::PerformMemberExprBaseConversion(Expr *Base, bool IsArrow) {
1226 if (IsArrow && !Base->getType()->isFunctionType())
1227 return DefaultFunctionArrayLvalueConversion(Base);
1228
1229 return CheckPlaceholderExpr(Base);
1230}
1231
1232/// Look up the given member of the given non-type-dependent
1233/// expression. This can return in one of two ways:
1234/// * If it returns a sentinel null-but-valid result, the caller will
1235/// assume that lookup was performed and the results written into
1236/// the provided structure. It will take over from there.
1237/// * Otherwise, the returned expression will be produced in place of
1238/// an ordinary member expression.
1239///
1240/// The ObjCImpDecl bit is a gross hack that will need to be properly
1241/// fixed for ObjC++.
1242static ExprResult LookupMemberExpr(Sema &S, LookupResult &R,
1243 ExprResult &BaseExpr, bool &IsArrow,
1244 SourceLocation OpLoc, CXXScopeSpec &SS,
1245 Decl *ObjCImpDecl, bool HasTemplateArgs,
1246 SourceLocation TemplateKWLoc) {
1247 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-13~++20210413100635+64c24f493e5f/clang/lib/Sema/SemaExprMember.cpp"
, 1247, __PRETTY_FUNCTION__))
;
1
Assuming the condition is true
2
'?' condition is true
1248
1249 // Perform default conversions.
1250 BaseExpr = S.PerformMemberExprBaseConversion(BaseExpr.get(), IsArrow);
1251 if (BaseExpr.isInvalid())
3
Assuming the condition is false
4
Taking false branch
1252 return ExprError();
1253
1254 QualType BaseType = BaseExpr.get()->getType();
1255 assert(!BaseType->isDependentType())((!BaseType->isDependentType()) ? static_cast<void> (
0) : __assert_fail ("!BaseType->isDependentType()", "/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/clang/lib/Sema/SemaExprMember.cpp"
, 1255, __PRETTY_FUNCTION__))
;
5
Assuming the condition is true
6
'?' condition is true
1256
1257 DeclarationName MemberName = R.getLookupName();
1258 SourceLocation MemberLoc = R.getNameLoc();
1259
1260 // For later type-checking purposes, turn arrow accesses into dot
1261 // accesses. The only access type we support that doesn't follow
1262 // the C equivalence "a->b === (*a).b" is ObjC property accesses,
1263 // and those never use arrows, so this is unaffected.
1264 if (IsArrow
6.1
'IsArrow' is false
) {
7
Taking false branch
1265 if (const PointerType *Ptr = BaseType->getAs<PointerType>())
1266 BaseType = Ptr->getPointeeType();
1267 else if (const ObjCObjectPointerType *Ptr
1268 = BaseType->getAs<ObjCObjectPointerType>())
1269 BaseType = Ptr->getPointeeType();
1270 else if (BaseType->isRecordType()) {
1271 // Recover from arrow accesses to records, e.g.:
1272 // struct MyRecord foo;
1273 // foo->bar
1274 // This is actually well-formed in C++ if MyRecord has an
1275 // overloaded operator->, but that should have been dealt with
1276 // by now--or a diagnostic message already issued if a problem
1277 // was encountered while looking for the overloaded operator->.
1278 if (!S.getLangOpts().CPlusPlus) {
1279 S.Diag(OpLoc, diag::err_typecheck_member_reference_suggestion)
1280 << BaseType << int(IsArrow) << BaseExpr.get()->getSourceRange()
1281 << FixItHint::CreateReplacement(OpLoc, ".");
1282 }
1283 IsArrow = false;
1284 } else if (BaseType->isFunctionType()) {
1285 goto fail;
1286 } else {
1287 S.Diag(MemberLoc, diag::err_typecheck_member_reference_arrow)
1288 << BaseType << BaseExpr.get()->getSourceRange();
1289 return ExprError();
1290 }
1291 }
1292
1293 // Handle field access to simple records.
1294 if (const RecordType *RTy
8.1
'RTy' is null
= BaseType->getAs<RecordType>()) {
8
Assuming the object is not a 'RecordType'
9
Taking false branch
1295 TypoExpr *TE = nullptr;
1296 if (LookupMemberExprInRecord(S, R, BaseExpr.get(), RTy, OpLoc, IsArrow, SS,
1297 HasTemplateArgs, TemplateKWLoc, TE))
1298 return ExprError();
1299
1300 // Returning valid-but-null is how we indicate to the caller that
1301 // the lookup result was filled in. If typo correction was attempted and
1302 // failed, the lookup result will have been cleared--that combined with the
1303 // valid-but-null ExprResult will trigger the appropriate diagnostics.
1304 return ExprResult(TE);
1305 }
1306
1307 // Handle ivar access to Objective-C objects.
1308 if (const ObjCObjectType *OTy
10.1
'OTy' is null
= BaseType->getAs<ObjCObjectType>()) {
10
Assuming the object is not a 'ObjCObjectType'
11
Taking false branch
1309 if (!SS.isEmpty() && !SS.isInvalid()) {
1310 S.Diag(SS.getRange().getBegin(), diag::err_qualified_objc_access)
1311 << 1 << SS.getScopeRep()
1312 << FixItHint::CreateRemoval(SS.getRange());
1313 SS.clear();
1314 }
1315
1316 IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
1317
1318 // There are three cases for the base type:
1319 // - builtin id (qualified or unqualified)
1320 // - builtin Class (qualified or unqualified)
1321 // - an interface
1322 ObjCInterfaceDecl *IDecl = OTy->getInterface();
1323 if (!IDecl) {
1324 if (S.getLangOpts().ObjCAutoRefCount &&
1325 (OTy->isObjCId() || OTy->isObjCClass()))
1326 goto fail;
1327 // There's an implicit 'isa' ivar on all objects.
1328 // But we only actually find it this way on objects of type 'id',
1329 // apparently.
1330 if (OTy->isObjCId() && Member->isStr("isa"))
1331 return new (S.Context) ObjCIsaExpr(BaseExpr.get(), IsArrow, MemberLoc,
1332 OpLoc, S.Context.getObjCClassType());
1333 if (ShouldTryAgainWithRedefinitionType(S, BaseExpr))
1334 return LookupMemberExpr(S, R, BaseExpr, IsArrow, OpLoc, SS,
1335 ObjCImpDecl, HasTemplateArgs, TemplateKWLoc);
1336 goto fail;
1337 }
1338
1339 if (S.RequireCompleteType(OpLoc, BaseType,
1340 diag::err_typecheck_incomplete_tag,
1341 BaseExpr.get()))
1342 return ExprError();
1343
1344 ObjCInterfaceDecl *ClassDeclared = nullptr;
1345 ObjCIvarDecl *IV = IDecl->lookupInstanceVariable(Member, ClassDeclared);
1346
1347 if (!IV) {
1348 // Attempt to correct for typos in ivar names.
1349 DeclFilterCCC<ObjCIvarDecl> Validator{};
1350 Validator.IsObjCIvarLookup = IsArrow;
1351 if (TypoCorrection Corrected = S.CorrectTypo(
1352 R.getLookupNameInfo(), Sema::LookupMemberName, nullptr, nullptr,
1353 Validator, Sema::CTK_ErrorRecovery, IDecl)) {
1354 IV = Corrected.getCorrectionDeclAs<ObjCIvarDecl>();
1355 S.diagnoseTypo(
1356 Corrected,
1357 S.PDiag(diag::err_typecheck_member_reference_ivar_suggest)
1358 << IDecl->getDeclName() << MemberName);
1359
1360 // Figure out the class that declares the ivar.
1361 assert(!ClassDeclared)((!ClassDeclared) ? static_cast<void> (0) : __assert_fail
("!ClassDeclared", "/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/clang/lib/Sema/SemaExprMember.cpp"
, 1361, __PRETTY_FUNCTION__))
;
1362
1363 Decl *D = cast<Decl>(IV->getDeclContext());
1364 if (auto *Category = dyn_cast<ObjCCategoryDecl>(D))
1365 D = Category->getClassInterface();
1366
1367 if (auto *Implementation = dyn_cast<ObjCImplementationDecl>(D))
1368 ClassDeclared = Implementation->getClassInterface();
1369 else if (auto *Interface = dyn_cast<ObjCInterfaceDecl>(D))
1370 ClassDeclared = Interface;
1371
1372 assert(ClassDeclared && "cannot query interface")((ClassDeclared && "cannot query interface") ? static_cast
<void> (0) : __assert_fail ("ClassDeclared && \"cannot query interface\""
, "/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/clang/lib/Sema/SemaExprMember.cpp"
, 1372, __PRETTY_FUNCTION__))
;
1373 } else {
1374 if (IsArrow &&
1375 IDecl->FindPropertyDeclaration(
1376 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) {
1377 S.Diag(MemberLoc, diag::err_property_found_suggest)
1378 << Member << BaseExpr.get()->getType()
1379 << FixItHint::CreateReplacement(OpLoc, ".");
1380 return ExprError();
1381 }
1382
1383 S.Diag(MemberLoc, diag::err_typecheck_member_reference_ivar)
1384 << IDecl->getDeclName() << MemberName
1385 << BaseExpr.get()->getSourceRange();
1386 return ExprError();
1387 }
1388 }
1389
1390 assert(ClassDeclared)((ClassDeclared) ? static_cast<void> (0) : __assert_fail
("ClassDeclared", "/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/clang/lib/Sema/SemaExprMember.cpp"
, 1390, __PRETTY_FUNCTION__))
;
1391
1392 // If the decl being referenced had an error, return an error for this
1393 // sub-expr without emitting another error, in order to avoid cascading
1394 // error cases.
1395 if (IV->isInvalidDecl())
1396 return ExprError();
1397
1398 // Check whether we can reference this field.
1399 if (S.DiagnoseUseOfDecl(IV, MemberLoc))
1400 return ExprError();
1401 if (IV->getAccessControl() != ObjCIvarDecl::Public &&
1402 IV->getAccessControl() != ObjCIvarDecl::Package) {
1403 ObjCInterfaceDecl *ClassOfMethodDecl = nullptr;
1404 if (ObjCMethodDecl *MD = S.getCurMethodDecl())
1405 ClassOfMethodDecl = MD->getClassInterface();
1406 else if (ObjCImpDecl && S.getCurFunctionDecl()) {
1407 // Case of a c-function declared inside an objc implementation.
1408 // FIXME: For a c-style function nested inside an objc implementation
1409 // class, there is no implementation context available, so we pass
1410 // down the context as argument to this routine. Ideally, this context
1411 // need be passed down in the AST node and somehow calculated from the
1412 // AST for a function decl.
1413 if (ObjCImplementationDecl *IMPD =
1414 dyn_cast<ObjCImplementationDecl>(ObjCImpDecl))
1415 ClassOfMethodDecl = IMPD->getClassInterface();
1416 else if (ObjCCategoryImplDecl* CatImplClass =
1417 dyn_cast<ObjCCategoryImplDecl>(ObjCImpDecl))
1418 ClassOfMethodDecl = CatImplClass->getClassInterface();
1419 }
1420 if (!S.getLangOpts().DebuggerSupport) {
1421 if (IV->getAccessControl() == ObjCIvarDecl::Private) {
1422 if (!declaresSameEntity(ClassDeclared, IDecl) ||
1423 !declaresSameEntity(ClassOfMethodDecl, ClassDeclared))
1424 S.Diag(MemberLoc, diag::err_private_ivar_access)
1425 << IV->getDeclName();
1426 } else if (!IDecl->isSuperClassOf(ClassOfMethodDecl))
1427 // @protected
1428 S.Diag(MemberLoc, diag::err_protected_ivar_access)
1429 << IV->getDeclName();
1430 }
1431 }
1432 bool warn = true;
1433 if (S.getLangOpts().ObjCWeak) {
1434 Expr *BaseExp = BaseExpr.get()->IgnoreParenImpCasts();
1435 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(BaseExp))
1436 if (UO->getOpcode() == UO_Deref)
1437 BaseExp = UO->getSubExpr()->IgnoreParenCasts();
1438
1439 if (DeclRefExpr *DE = dyn_cast<DeclRefExpr>(BaseExp))
1440 if (DE->getType().getObjCLifetime() == Qualifiers::OCL_Weak) {
1441 S.Diag(DE->getLocation(), diag::err_arc_weak_ivar_access);
1442 warn = false;
1443 }
1444 }
1445 if (warn) {
1446 if (ObjCMethodDecl *MD = S.getCurMethodDecl()) {
1447 ObjCMethodFamily MF = MD->getMethodFamily();
1448 warn = (MF != OMF_init && MF != OMF_dealloc &&
1449 MF != OMF_finalize &&
1450 !S.IvarBacksCurrentMethodAccessor(IDecl, MD, IV));
1451 }
1452 if (warn)
1453 S.Diag(MemberLoc, diag::warn_direct_ivar_access) << IV->getDeclName();
1454 }
1455
1456 ObjCIvarRefExpr *Result = new (S.Context) ObjCIvarRefExpr(
1457 IV, IV->getUsageType(BaseType), MemberLoc, OpLoc, BaseExpr.get(),
1458 IsArrow);
1459
1460 if (IV->getType().getObjCLifetime() == Qualifiers::OCL_Weak) {
1461 if (!S.isUnevaluatedContext() &&
1462 !S.Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, MemberLoc))
1463 S.getCurFunction()->recordUseOfWeak(Result);
1464 }
1465
1466 return Result;
1467 }
1468
1469 // Objective-C property access.
1470 const ObjCObjectPointerType *OPT;
1471 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
1472 if (!SS.isEmpty() && !SS.isInvalid()) {
1473 S.Diag(SS.getRange().getBegin(), diag::err_qualified_objc_access)
1474 << 0 << SS.getScopeRep() << FixItHint::CreateRemoval(SS.getRange());
1475 SS.clear();
1476 }
1477
1478 // This actually uses the base as an r-value.
1479 BaseExpr = S.DefaultLvalueConversion(BaseExpr.get());
1480 if (BaseExpr.isInvalid())
1481 return ExprError();
1482
1483 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-13~++20210413100635+64c24f493e5f/clang/lib/Sema/SemaExprMember.cpp"
, 1484, __PRETTY_FUNCTION__))
1484 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-13~++20210413100635+64c24f493e5f/clang/lib/Sema/SemaExprMember.cpp"
, 1484, __PRETTY_FUNCTION__))
;
1485
1486 IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
1487
1488 const ObjCObjectType *OT = OPT->getObjectType();
1489
1490 // id, with and without qualifiers.
1491 if (OT->isObjCId()) {
1492 // Check protocols on qualified interfaces.
1493 Selector Sel = S.PP.getSelectorTable().getNullarySelector(Member);
1494 if (Decl *PMDecl =
1495 FindGetterSetterNameDecl(OPT, Member, Sel, S.Context)) {
1496 if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) {
1497 // Check the use of this declaration
1498 if (S.DiagnoseUseOfDecl(PD, MemberLoc))
1499 return ExprError();
1500
1501 return new (S.Context)
1502 ObjCPropertyRefExpr(PD, S.Context.PseudoObjectTy, VK_LValue,
1503 OK_ObjCProperty, MemberLoc, BaseExpr.get());
1504 }
1505
1506 if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) {
1507 Selector SetterSel =
1508 SelectorTable::constructSetterSelector(S.PP.getIdentifierTable(),
1509 S.PP.getSelectorTable(),
1510 Member);
1511 ObjCMethodDecl *SMD = nullptr;
1512 if (Decl *SDecl = FindGetterSetterNameDecl(OPT,
1513 /*Property id*/ nullptr,
1514 SetterSel, S.Context))
1515 SMD = dyn_cast<ObjCMethodDecl>(SDecl);
1516
1517 return new (S.Context)
1518 ObjCPropertyRefExpr(OMD, SMD, S.Context.PseudoObjectTy, VK_LValue,
1519 OK_ObjCProperty, MemberLoc, BaseExpr.get());
1520 }
1521 }
1522 // Use of id.member can only be for a property reference. Do not
1523 // use the 'id' redefinition in this case.
1524 if (IsArrow && ShouldTryAgainWithRedefinitionType(S, BaseExpr))
1525 return LookupMemberExpr(S, R, BaseExpr, IsArrow, OpLoc, SS,
1526 ObjCImpDecl, HasTemplateArgs, TemplateKWLoc);
1527
1528 return ExprError(S.Diag(MemberLoc, diag::err_property_not_found)
1529 << MemberName << BaseType);
1530 }
1531
1532 // 'Class', unqualified only.
1533 if (OT->isObjCClass()) {
1534 // Only works in a method declaration (??!).
1535 ObjCMethodDecl *MD = S.getCurMethodDecl();
1536 if (!MD) {
1537 if (ShouldTryAgainWithRedefinitionType(S, BaseExpr))
1538 return LookupMemberExpr(S, R, BaseExpr, IsArrow, OpLoc, SS,
1539 ObjCImpDecl, HasTemplateArgs, TemplateKWLoc);
1540
1541 goto fail;
1542 }
1543
1544 // Also must look for a getter name which uses property syntax.
1545 Selector Sel = S.PP.getSelectorTable().getNullarySelector(Member);
1546 ObjCInterfaceDecl *IFace = MD->getClassInterface();
1547 if (!IFace)
1548 goto fail;
1549
1550 ObjCMethodDecl *Getter;
1551 if ((Getter = IFace->lookupClassMethod(Sel))) {
1552 // Check the use of this method.
1553 if (S.DiagnoseUseOfDecl(Getter, MemberLoc))
1554 return ExprError();
1555 } else
1556 Getter = IFace->lookupPrivateMethod(Sel, false);
1557 // If we found a getter then this may be a valid dot-reference, we
1558 // will look for the matching setter, in case it is needed.
1559 Selector SetterSel =
1560 SelectorTable::constructSetterSelector(S.PP.getIdentifierTable(),
1561 S.PP.getSelectorTable(),
1562 Member);
1563 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel);
1564 if (!Setter) {
1565 // If this reference is in an @implementation, also check for 'private'
1566 // methods.
1567 Setter = IFace->lookupPrivateMethod(SetterSel, false);
1568 }
1569
1570 if (Setter && S.DiagnoseUseOfDecl(Setter, MemberLoc))
1571 return ExprError();
1572
1573 if (Getter || Setter) {
1574 return new (S.Context) ObjCPropertyRefExpr(
1575 Getter, Setter, S.Context.PseudoObjectTy, VK_LValue,
1576 OK_ObjCProperty, MemberLoc, BaseExpr.get());
1577 }
1578
1579 if (ShouldTryAgainWithRedefinitionType(S, BaseExpr))
1580 return LookupMemberExpr(S, R, BaseExpr, IsArrow, OpLoc, SS,
1581 ObjCImpDecl, HasTemplateArgs, TemplateKWLoc);
1582
1583 return ExprError(S.Diag(MemberLoc, diag::err_property_not_found)
1584 << MemberName << BaseType);
1585 }
1586
1587 // Normal property access.
1588 return S.HandleExprPropertyRefExpr(OPT, BaseExpr.get(), OpLoc, MemberName,
1589 MemberLoc, SourceLocation(), QualType(),
1590 false);
1591 }
1592
1593 // Handle 'field access' to vectors, such as 'V.xx'.
1594 if (BaseType->isExtVectorType()) {
15
Taking true branch
1595 // FIXME: this expr should store IsArrow.
1596 IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
1597 ExprValueKind VK;
1598 if (IsArrow
15.1
'IsArrow' is false
)
16
Taking false branch
1599 VK = VK_LValue;
1600 else {
1601 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
1602 VK = POE->getSyntacticForm()->getValueKind();
1603 else
1604 VK = BaseExpr.get()->getValueKind();
1605 }
1606
1607 QualType ret = CheckExtVectorComponent(S, BaseType, VK, OpLoc,
19
Calling 'CheckExtVectorComponent'
1608 Member, MemberLoc);
1609 if (ret.isNull())
1610 return ExprError();
1611 Qualifiers BaseQ =
1612 S.Context.getCanonicalType(BaseExpr.get()->getType()).getQualifiers();
1613 ret = S.Context.getQualifiedType(ret, BaseQ);
1614
1615 return new (S.Context)
1616 ExtVectorElementExpr(ret, VK, BaseExpr.get(), *Member, MemberLoc);
1617 }
1618
1619 // Adjust builtin-sel to the appropriate redefinition type if that's
1620 // not just a pointer to builtin-sel again.
1621 if (IsArrow && BaseType->isSpecificBuiltinType(BuiltinType::ObjCSel) &&
1622 !S.Context.getObjCSelRedefinitionType()->isObjCSelType()) {
1623 BaseExpr = S.ImpCastExprToType(
1624 BaseExpr.get(), S.Context.getObjCSelRedefinitionType(), CK_BitCast);
1625 return LookupMemberExpr(S, R, BaseExpr, IsArrow, OpLoc, SS,
1626 ObjCImpDecl, HasTemplateArgs, TemplateKWLoc);
1627 }
1628
1629 // Failure cases.
1630 fail:
1631
1632 // Recover from dot accesses to pointers, e.g.:
1633 // type *foo;
1634 // foo.bar
1635 // This is actually well-formed in two cases:
1636 // - 'type' is an Objective C type
1637 // - 'bar' is a pseudo-destructor name which happens to refer to
1638 // the appropriate pointer type
1639 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) {
1640 if (!IsArrow && Ptr->getPointeeType()->isRecordType() &&
1641 MemberName.getNameKind() != DeclarationName::CXXDestructorName) {
1642 S.Diag(OpLoc, diag::err_typecheck_member_reference_suggestion)
1643 << BaseType << int(IsArrow) << BaseExpr.get()->getSourceRange()
1644 << FixItHint::CreateReplacement(OpLoc, "->");
1645
1646 // Recurse as an -> access.
1647 IsArrow = true;
1648 return LookupMemberExpr(S, R, BaseExpr, IsArrow, OpLoc, SS,
1649 ObjCImpDecl, HasTemplateArgs, TemplateKWLoc);
1650 }
1651 }
1652
1653 // If the user is trying to apply -> or . to a function name, it's probably
1654 // because they forgot parentheses to call that function.
1655 if (S.tryToRecoverWithCall(
1656 BaseExpr, S.PDiag(diag::err_member_reference_needs_call),
1657 /*complain*/ false,
1658 IsArrow ? &isPointerToRecordType : &isRecordType)) {
1659 if (BaseExpr.isInvalid())
1660 return ExprError();
1661 BaseExpr = S.DefaultFunctionArrayConversion(BaseExpr.get());
1662 return LookupMemberExpr(S, R, BaseExpr, IsArrow, OpLoc, SS,
1663 ObjCImpDecl, HasTemplateArgs, TemplateKWLoc);
1664 }
1665
1666 S.Diag(OpLoc, diag::err_typecheck_member_reference_struct_union)
1667 << BaseType << BaseExpr.get()->getSourceRange() << MemberLoc;
1668
1669 return ExprError();
1670}
1671
1672/// The main callback when the parser finds something like
1673/// expression . [nested-name-specifier] identifier
1674/// expression -> [nested-name-specifier] identifier
1675/// where 'identifier' encompasses a fairly broad spectrum of
1676/// possibilities, including destructor and operator references.
1677///
1678/// \param OpKind either tok::arrow or tok::period
1679/// \param ObjCImpDecl the current Objective-C \@implementation
1680/// decl; this is an ugly hack around the fact that Objective-C
1681/// \@implementations aren't properly put in the context chain
1682ExprResult Sema::ActOnMemberAccessExpr(Scope *S, Expr *Base,
1683 SourceLocation OpLoc,
1684 tok::TokenKind OpKind,
1685 CXXScopeSpec &SS,
1686 SourceLocation TemplateKWLoc,
1687 UnqualifiedId &Id,
1688 Decl *ObjCImpDecl) {
1689 if (SS.isSet() && SS.isInvalid())
1690 return ExprError();
1691
1692 // Warn about the explicit constructor calls Microsoft extension.
1693 if (getLangOpts().MicrosoftExt &&
1694 Id.getKind() == UnqualifiedIdKind::IK_ConstructorName)
1695 Diag(Id.getSourceRange().getBegin(),
1696 diag::ext_ms_explicit_constructor_call);
1697
1698 TemplateArgumentListInfo TemplateArgsBuffer;
1699
1700 // Decompose the name into its component parts.
1701 DeclarationNameInfo NameInfo;
1702 const TemplateArgumentListInfo *TemplateArgs;
1703 DecomposeUnqualifiedId(Id, TemplateArgsBuffer,
1704 NameInfo, TemplateArgs);
1705
1706 DeclarationName Name = NameInfo.getName();
1707 bool IsArrow = (OpKind == tok::arrow);
1708
1709 NamedDecl *FirstQualifierInScope
1710 = (!SS.isSet() ? nullptr : FindFirstQualifierInScope(S, SS.getScopeRep()));
1711
1712 // This is a postfix expression, so get rid of ParenListExprs.
1713 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Base);
1714 if (Result.isInvalid()) return ExprError();
1715 Base = Result.get();
1716
1717 if (Base->getType()->isDependentType() || Name.isDependentName() ||
1718 isDependentScopeSpecifier(SS)) {
1719 return ActOnDependentMemberExpr(Base, Base->getType(), IsArrow, OpLoc, SS,
1720 TemplateKWLoc, FirstQualifierInScope,
1721 NameInfo, TemplateArgs);
1722 }
1723
1724 ActOnMemberAccessExtraArgs ExtraArgs = {S, Id, ObjCImpDecl};
1725 ExprResult Res = BuildMemberReferenceExpr(
1726 Base, Base->getType(), OpLoc, IsArrow, SS, TemplateKWLoc,
1727 FirstQualifierInScope, NameInfo, TemplateArgs, S, &ExtraArgs);
1728
1729 if (!Res.isInvalid() && isa<MemberExpr>(Res.get()))
1730 CheckMemberAccessOfNoDeref(cast<MemberExpr>(Res.get()));
1731
1732 return Res;
1733}
1734
1735void Sema::CheckMemberAccessOfNoDeref(const MemberExpr *E) {
1736 if (isUnevaluatedContext())
1737 return;
1738
1739 QualType ResultTy = E->getType();
1740
1741 // Member accesses have four cases:
1742 // 1: non-array member via "->": dereferences
1743 // 2: non-array member via ".": nothing interesting happens
1744 // 3: array member access via "->": nothing interesting happens
1745 // (this returns an array lvalue and does not actually dereference memory)
1746 // 4: array member access via ".": *adds* a layer of indirection
1747 if (ResultTy->isArrayType()) {
1748 if (!E->isArrow()) {
1749 // This might be something like:
1750 // (*structPtr).arrayMember
1751 // which behaves roughly like:
1752 // &(*structPtr).pointerMember
1753 // in that the apparent dereference in the base expression does not
1754 // actually happen.
1755 CheckAddressOfNoDeref(E->getBase());
1756 }
1757 } else if (E->isArrow()) {
1758 if (const auto *Ptr = dyn_cast<PointerType>(
1759 E->getBase()->getType().getDesugaredType(Context))) {
1760 if (Ptr->getPointeeType()->hasAttr(attr::NoDeref))
1761 ExprEvalContexts.back().PossibleDerefs.insert(E);
1762 }
1763 }
1764}
1765
1766ExprResult
1767Sema::BuildFieldReferenceExpr(Expr *BaseExpr, bool IsArrow,
1768 SourceLocation OpLoc, const CXXScopeSpec &SS,
1769 FieldDecl *Field, DeclAccessPair FoundDecl,
1770 const DeclarationNameInfo &MemberNameInfo) {
1771 // x.a is an l-value if 'a' has a reference type. Otherwise:
1772 // x.a is an l-value/x-value/pr-value if the base is (and note
1773 // that *x is always an l-value), except that if the base isn't
1774 // an ordinary object then we must have an rvalue.
1775 ExprValueKind VK = VK_LValue;
1776 ExprObjectKind OK = OK_Ordinary;
1777 if (!IsArrow) {
1778 if (BaseExpr->getObjectKind() == OK_Ordinary)
1779 VK = BaseExpr->getValueKind();
1780 else
1781 VK = VK_RValue;
1782 }
1783 if (VK != VK_RValue && Field->isBitField())
1784 OK = OK_BitField;
1785
1786 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref]
1787 QualType MemberType = Field->getType();
1788 if (const ReferenceType *Ref = MemberType->getAs<ReferenceType>()) {
1789 MemberType = Ref->getPointeeType();
1790 VK = VK_LValue;
1791 } else {
1792 QualType BaseType = BaseExpr->getType();
1793 if (IsArrow) BaseType = BaseType->castAs<PointerType>()->getPointeeType();
1794
1795 Qualifiers BaseQuals = BaseType.getQualifiers();
1796
1797 // GC attributes are never picked up by members.
1798 BaseQuals.removeObjCGCAttr();
1799
1800 // CVR attributes from the base are picked up by members,
1801 // except that 'mutable' members don't pick up 'const'.
1802 if (Field->isMutable()) BaseQuals.removeConst();
1803
1804 Qualifiers MemberQuals =
1805 Context.getCanonicalType(MemberType).getQualifiers();
1806
1807 assert(!MemberQuals.hasAddressSpace())((!MemberQuals.hasAddressSpace()) ? static_cast<void> (
0) : __assert_fail ("!MemberQuals.hasAddressSpace()", "/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/clang/lib/Sema/SemaExprMember.cpp"
, 1807, __PRETTY_FUNCTION__))
;
1808
1809 Qualifiers Combined = BaseQuals + MemberQuals;
1810 if (Combined != MemberQuals)
1811 MemberType = Context.getQualifiedType(MemberType, Combined);
1812
1813 // Pick up NoDeref from the base in case we end up using AddrOf on the
1814 // result. E.g. the expression
1815 // &someNoDerefPtr->pointerMember
1816 // should be a noderef pointer again.
1817 if (BaseType->hasAttr(attr::NoDeref))
1818 MemberType =
1819 Context.getAttributedType(attr::NoDeref, MemberType, MemberType);
1820 }
1821
1822 auto *CurMethod = dyn_cast<CXXMethodDecl>(CurContext);
1823 if (!(CurMethod && CurMethod->isDefaulted()))
1824 UnusedPrivateFields.remove(Field);
1825
1826 ExprResult Base = PerformObjectMemberConversion(BaseExpr, SS.getScopeRep(),
1827 FoundDecl, Field);
1828 if (Base.isInvalid())
1829 return ExprError();
1830
1831 // Build a reference to a private copy for non-static data members in
1832 // non-static member functions, privatized by OpenMP constructs.
1833 if (getLangOpts().OpenMP && IsArrow &&
1834 !CurContext->isDependentContext() &&
1835 isa<CXXThisExpr>(Base.get()->IgnoreParenImpCasts())) {
1836 if (auto *PrivateCopy = isOpenMPCapturedDecl(Field)) {
1837 return getOpenMPCapturedExpr(PrivateCopy, VK, OK,
1838 MemberNameInfo.getLoc());
1839 }
1840 }
1841
1842 return BuildMemberExpr(Base.get(), IsArrow, OpLoc, &SS,
1843 /*TemplateKWLoc=*/SourceLocation(), Field, FoundDecl,
1844 /*HadMultipleCandidates=*/false, MemberNameInfo,
1845 MemberType, VK, OK);
1846}
1847
1848/// Builds an implicit member access expression. The current context
1849/// is known to be an instance method, and the given unqualified lookup
1850/// set is known to contain only instance members, at least one of which
1851/// is from an appropriate type.
1852ExprResult
1853Sema::BuildImplicitMemberExpr(const CXXScopeSpec &SS,
1854 SourceLocation TemplateKWLoc,
1855 LookupResult &R,
1856 const TemplateArgumentListInfo *TemplateArgs,
1857 bool IsKnownInstance, const Scope *S) {
1858 assert(!R.empty() && !R.isAmbiguous())((!R.empty() && !R.isAmbiguous()) ? static_cast<void
> (0) : __assert_fail ("!R.empty() && !R.isAmbiguous()"
, "/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/clang/lib/Sema/SemaExprMember.cpp"
, 1858, __PRETTY_FUNCTION__))
;
1859
1860 SourceLocation loc = R.getNameLoc();
1861
1862 // If this is known to be an instance access, go ahead and build an
1863 // implicit 'this' expression now.
1864 QualType ThisTy = getCurrentThisType();
1865 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-13~++20210413100635+64c24f493e5f/clang/lib/Sema/SemaExprMember.cpp"
, 1865, __PRETTY_FUNCTION__))
;
1866
1867 Expr *baseExpr = nullptr; // null signifies implicit access
1868 if (IsKnownInstance) {
1869 SourceLocation Loc = R.getNameLoc();
1870 if (SS.getRange().isValid())
1871 Loc = SS.getRange().getBegin();
1872 baseExpr = BuildCXXThisExpr(loc, ThisTy, /*IsImplicit=*/true);
1873 }
1874
1875 return BuildMemberReferenceExpr(baseExpr, ThisTy,
1876 /*OpLoc*/ SourceLocation(),
1877 /*IsArrow*/ true,
1878 SS, TemplateKWLoc,
1879 /*FirstQualifierInScope*/ nullptr,
1880 R, TemplateArgs, S);
1881}