1//===--- Sema.cpp - AST Builder and Semantic Analysis Implementation ------===//
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 the actions class which performs semantic analysis and
10// builds an AST out of a parse stream.
11//
12//===----------------------------------------------------------------------===//
13
14#include "UsedDeclVisitor.h"
15#include "clang/AST/ASTContext.h"
16#include "clang/AST/ASTDiagnostic.h"
17#include "clang/AST/Decl.h"
18#include "clang/AST/DeclCXX.h"
19#include "clang/AST/DeclFriend.h"
20#include "clang/AST/DeclObjC.h"
21#include "clang/AST/Expr.h"
22#include "clang/AST/ExprCXX.h"
23#include "clang/AST/PrettyDeclStackTrace.h"
24#include "clang/AST/StmtCXX.h"
25#include "clang/AST/TypeOrdering.h"
26#include "clang/Basic/DarwinSDKInfo.h"
27#include "clang/Basic/DiagnosticOptions.h"
28#include "clang/Basic/PartialDiagnostic.h"
29#include "clang/Basic/SourceManager.h"
30#include "clang/Basic/TargetInfo.h"
31#include "clang/Lex/HeaderSearch.h"
32#include "clang/Lex/HeaderSearchOptions.h"
33#include "clang/Lex/Preprocessor.h"
34#include "clang/Sema/CXXFieldCollector.h"
35#include "clang/Sema/EnterExpressionEvaluationContext.h"
36#include "clang/Sema/ExternalSemaSource.h"
37#include "clang/Sema/Initialization.h"
38#include "clang/Sema/MultiplexExternalSemaSource.h"
39#include "clang/Sema/ObjCMethodList.h"
40#include "clang/Sema/RISCVIntrinsicManager.h"
41#include "clang/Sema/Scope.h"
42#include "clang/Sema/ScopeInfo.h"
43#include "clang/Sema/SemaAMDGPU.h"
44#include "clang/Sema/SemaARM.h"
45#include "clang/Sema/SemaAVR.h"
46#include "clang/Sema/SemaBPF.h"
47#include "clang/Sema/SemaCUDA.h"
48#include "clang/Sema/SemaCodeCompletion.h"
49#include "clang/Sema/SemaConsumer.h"
50#include "clang/Sema/SemaDirectX.h"
51#include "clang/Sema/SemaHLSL.h"
52#include "clang/Sema/SemaHexagon.h"
53#include "clang/Sema/SemaLoongArch.h"
54#include "clang/Sema/SemaM68k.h"
55#include "clang/Sema/SemaMIPS.h"
56#include "clang/Sema/SemaMSP430.h"
57#include "clang/Sema/SemaNVPTX.h"
58#include "clang/Sema/SemaObjC.h"
59#include "clang/Sema/SemaOpenACC.h"
60#include "clang/Sema/SemaOpenCL.h"
61#include "clang/Sema/SemaOpenMP.h"
62#include "clang/Sema/SemaPPC.h"
63#include "clang/Sema/SemaPseudoObject.h"
64#include "clang/Sema/SemaRISCV.h"
65#include "clang/Sema/SemaSPIRV.h"
66#include "clang/Sema/SemaSYCL.h"
67#include "clang/Sema/SemaSwift.h"
68#include "clang/Sema/SemaSystemZ.h"
69#include "clang/Sema/SemaWasm.h"
70#include "clang/Sema/SemaX86.h"
71#include "clang/Sema/TemplateDeduction.h"
72#include "clang/Sema/TypoCorrection.h"
73#include "llvm/ADT/DenseMap.h"
74#include "llvm/ADT/STLExtras.h"
75#include "llvm/ADT/SetVector.h"
76#include "llvm/ADT/SmallPtrSet.h"
77#include "llvm/Support/TimeProfiler.h"
78#include <optional>
79
80using namespace clang;
81using namespace sema;
82
83SourceLocation Sema::getLocForEndOfToken(SourceLocation Loc, unsigned Offset) {
84 return Lexer::getLocForEndOfToken(Loc, Offset, SM: SourceMgr, LangOpts);
85}
86
87SourceRange
88Sema::getRangeForNextToken(SourceLocation Loc, bool IncludeMacros,
89 bool IncludeComments,
90 std::optional<tok::TokenKind> ExpectedToken) {
91 if (!Loc.isValid())
92 return SourceRange();
93 std::optional<Token> NextToken =
94 Lexer::findNextToken(Loc, SM: SourceMgr, LangOpts, IncludeComments);
95 if (!NextToken)
96 return SourceRange();
97 if (ExpectedToken && NextToken->getKind() != *ExpectedToken)
98 return SourceRange();
99 SourceLocation TokenStart = NextToken->getLocation();
100 SourceLocation TokenEnd = NextToken->getLastLoc();
101 if (!TokenStart.isValid() || !TokenEnd.isValid())
102 return SourceRange();
103 if (!IncludeMacros && (TokenStart.isMacroID() || TokenEnd.isMacroID()))
104 return SourceRange();
105
106 return SourceRange(TokenStart, TokenEnd);
107}
108
109ModuleLoader &Sema::getModuleLoader() const { return PP.getModuleLoader(); }
110
111DarwinSDKInfo *
112Sema::getDarwinSDKInfoForAvailabilityChecking(SourceLocation Loc,
113 StringRef Platform) {
114 auto *SDKInfo = getDarwinSDKInfoForAvailabilityChecking();
115 if (!SDKInfo && !WarnedDarwinSDKInfoMissing) {
116 Diag(Loc, DiagID: diag::warn_missing_sdksettings_for_availability_checking)
117 << Platform;
118 WarnedDarwinSDKInfoMissing = true;
119 }
120 return SDKInfo;
121}
122
123DarwinSDKInfo *Sema::getDarwinSDKInfoForAvailabilityChecking() {
124 if (CachedDarwinSDKInfo)
125 return CachedDarwinSDKInfo->get();
126 auto SDKInfo = parseDarwinSDKInfo(
127 VFS&: PP.getFileManager().getVirtualFileSystem(),
128 SDKRootPath: PP.getHeaderSearchInfo().getHeaderSearchOpts().Sysroot);
129 if (SDKInfo && *SDKInfo) {
130 CachedDarwinSDKInfo = std::make_unique<DarwinSDKInfo>(args: std::move(**SDKInfo));
131 return CachedDarwinSDKInfo->get();
132 }
133 if (!SDKInfo)
134 llvm::consumeError(Err: SDKInfo.takeError());
135 CachedDarwinSDKInfo = std::unique_ptr<DarwinSDKInfo>();
136 return nullptr;
137}
138
139IdentifierInfo *Sema::InventAbbreviatedTemplateParameterTypeName(
140 const IdentifierInfo *ParamName, unsigned int Index) {
141 std::string InventedName;
142 llvm::raw_string_ostream OS(InventedName);
143
144 if (!ParamName)
145 OS << "auto:" << Index + 1;
146 else
147 OS << ParamName->getName() << ":auto";
148
149 return &Context.Idents.get(Name: OS.str());
150}
151
152PrintingPolicy Sema::getPrintingPolicy(const ASTContext &Context,
153 const Preprocessor &PP) {
154 PrintingPolicy Policy = Context.getPrintingPolicy();
155 // In diagnostics, we print _Bool as bool if the latter is defined as the
156 // former.
157 Policy.Bool = Context.getLangOpts().Bool;
158 if (!Policy.Bool) {
159 if (const MacroInfo *BoolMacro = PP.getMacroInfo(II: Context.getBoolName())) {
160 Policy.Bool = BoolMacro->isObjectLike() &&
161 BoolMacro->getNumTokens() == 1 &&
162 BoolMacro->getReplacementToken(Tok: 0).is(K: tok::kw__Bool);
163 }
164 }
165
166 // Shorten the data output if needed
167 Policy.EntireContentsOfLargeArray = false;
168
169 return Policy;
170}
171
172void Sema::ActOnTranslationUnitScope(Scope *S) {
173 TUScope = S;
174 PushDeclContext(S, DC: Context.getTranslationUnitDecl());
175}
176
177namespace clang {
178namespace sema {
179
180class SemaPPCallbacks : public PPCallbacks {
181 Sema *S = nullptr;
182 llvm::SmallVector<SourceLocation, 8> IncludeStack;
183 llvm::SmallVector<llvm::TimeTraceProfilerEntry *, 8> ProfilerStack;
184
185public:
186 void set(Sema &S) { this->S = &S; }
187
188 void reset() { S = nullptr; }
189
190 void FileChanged(SourceLocation Loc, FileChangeReason Reason,
191 SrcMgr::CharacteristicKind FileType,
192 FileID PrevFID) override {
193 if (!S)
194 return;
195 switch (Reason) {
196 case EnterFile: {
197 SourceManager &SM = S->getSourceManager();
198 SourceLocation IncludeLoc = SM.getIncludeLoc(FID: SM.getFileID(SpellingLoc: Loc));
199 if (IncludeLoc.isValid()) {
200 if (llvm::timeTraceProfilerEnabled()) {
201 OptionalFileEntryRef FE = SM.getFileEntryRefForID(FID: SM.getFileID(SpellingLoc: Loc));
202 ProfilerStack.push_back(Elt: llvm::timeTraceAsyncProfilerBegin(
203 Name: "Source", Detail: FE ? FE->getName() : StringRef("<unknown>")));
204 }
205
206 IncludeStack.push_back(Elt: IncludeLoc);
207 S->DiagnoseNonDefaultPragmaAlignPack(
208 Kind: Sema::PragmaAlignPackDiagnoseKind::NonDefaultStateAtInclude,
209 IncludeLoc);
210 }
211 break;
212 }
213 case ExitFile:
214 if (!IncludeStack.empty()) {
215 if (llvm::timeTraceProfilerEnabled())
216 llvm::timeTraceProfilerEnd(E: ProfilerStack.pop_back_val());
217
218 S->DiagnoseNonDefaultPragmaAlignPack(
219 Kind: Sema::PragmaAlignPackDiagnoseKind::ChangedStateAtExit,
220 IncludeLoc: IncludeStack.pop_back_val());
221 }
222 break;
223 default:
224 break;
225 }
226 }
227 void PragmaDiagnostic(SourceLocation Loc, StringRef Namespace,
228 diag::Severity Mapping, StringRef Str) override {
229 // If one of the analysis-based diagnostics was enabled while processing
230 // a function, we want to note it in the analysis-based warnings so they
231 // can be run at the end of the function body even if the analysis warnings
232 // are disabled at that point.
233 SmallVector<diag::kind, 256> GroupDiags;
234 diag::Flavor Flavor =
235 Str[1] == 'W' ? diag::Flavor::WarningOrError : diag::Flavor::Remark;
236 StringRef Group = Str.substr(Start: 2);
237
238 if (S->PP.getDiagnostics().getDiagnosticIDs()->getDiagnosticsInGroup(
239 Flavor, Group, Diags&: GroupDiags))
240 return;
241
242 for (diag::kind K : GroupDiags) {
243 // Note: the cases in this switch should be kept in sync with the
244 // diagnostics in AnalysisBasedWarnings::getPolicyInEffectAt().
245 AnalysisBasedWarnings::Policy &Override =
246 S->AnalysisWarnings.getPolicyOverrides();
247 switch (K) {
248 default: break;
249 case diag::warn_unreachable:
250 case diag::warn_unreachable_break:
251 case diag::warn_unreachable_return:
252 case diag::warn_unreachable_loop_increment:
253 Override.enableCheckUnreachable = true;
254 break;
255 case diag::warn_double_lock:
256 Override.enableThreadSafetyAnalysis = true;
257 break;
258 case diag::warn_use_in_invalid_state:
259 Override.enableConsumedAnalysis = true;
260 break;
261 }
262 }
263 }
264};
265
266} // end namespace sema
267} // end namespace clang
268
269const unsigned Sema::MaxAlignmentExponent;
270const uint64_t Sema::MaximumAlignment;
271
272Sema::Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
273 TranslationUnitKind TUKind, CodeCompleteConsumer *CodeCompleter)
274 : SemaBase(*this), CollectStats(false), TUKind(TUKind),
275 CurFPFeatures(pp.getLangOpts()), LangOpts(pp.getLangOpts()), PP(pp),
276 Context(ctxt), Consumer(consumer), Diags(PP.getDiagnostics()),
277 SourceMgr(PP.getSourceManager()), APINotes(SourceMgr, LangOpts),
278 AnalysisWarnings(*this), ThreadSafetyDeclCache(nullptr),
279 LateTemplateParser(nullptr), OpaqueParser(nullptr), CurContext(nullptr),
280 ExternalSource(nullptr), StackHandler(Diags), CurScope(nullptr),
281 Ident_super(nullptr), AMDGPUPtr(std::make_unique<SemaAMDGPU>(args&: *this)),
282 ARMPtr(std::make_unique<SemaARM>(args&: *this)),
283 AVRPtr(std::make_unique<SemaAVR>(args&: *this)),
284 BPFPtr(std::make_unique<SemaBPF>(args&: *this)),
285 CodeCompletionPtr(
286 std::make_unique<SemaCodeCompletion>(args&: *this, args&: CodeCompleter)),
287 CUDAPtr(std::make_unique<SemaCUDA>(args&: *this)),
288 DirectXPtr(std::make_unique<SemaDirectX>(args&: *this)),
289 HLSLPtr(std::make_unique<SemaHLSL>(args&: *this)),
290 HexagonPtr(std::make_unique<SemaHexagon>(args&: *this)),
291 LoongArchPtr(std::make_unique<SemaLoongArch>(args&: *this)),
292 M68kPtr(std::make_unique<SemaM68k>(args&: *this)),
293 MIPSPtr(std::make_unique<SemaMIPS>(args&: *this)),
294 MSP430Ptr(std::make_unique<SemaMSP430>(args&: *this)),
295 NVPTXPtr(std::make_unique<SemaNVPTX>(args&: *this)),
296 ObjCPtr(std::make_unique<SemaObjC>(args&: *this)),
297 OpenACCPtr(std::make_unique<SemaOpenACC>(args&: *this)),
298 OpenCLPtr(std::make_unique<SemaOpenCL>(args&: *this)),
299 OpenMPPtr(std::make_unique<SemaOpenMP>(args&: *this)),
300 PPCPtr(std::make_unique<SemaPPC>(args&: *this)),
301 PseudoObjectPtr(std::make_unique<SemaPseudoObject>(args&: *this)),
302 RISCVPtr(std::make_unique<SemaRISCV>(args&: *this)),
303 SPIRVPtr(std::make_unique<SemaSPIRV>(args&: *this)),
304 SYCLPtr(std::make_unique<SemaSYCL>(args&: *this)),
305 SwiftPtr(std::make_unique<SemaSwift>(args&: *this)),
306 SystemZPtr(std::make_unique<SemaSystemZ>(args&: *this)),
307 WasmPtr(std::make_unique<SemaWasm>(args&: *this)),
308 X86Ptr(std::make_unique<SemaX86>(args&: *this)),
309 MSPointerToMemberRepresentationMethod(
310 LangOpts.getMSPointerToMemberRepresentationMethod()),
311 MSStructPragmaOn(false), VtorDispStack(LangOpts.getVtorDispMode()),
312 AlignPackStack(AlignPackInfo(getLangOpts().XLPragmaPack)),
313 DataSegStack(nullptr), BSSSegStack(nullptr), ConstSegStack(nullptr),
314 CodeSegStack(nullptr), StrictGuardStackCheckStack(false),
315 FpPragmaStack(FPOptionsOverride()), CurInitSeg(nullptr),
316 VisContext(nullptr), PragmaAttributeCurrentTargetDecl(nullptr),
317 StdCoroutineTraitsCache(nullptr), IdResolver(pp),
318 OriginalLexicalContext(nullptr), StdInitializerList(nullptr),
319 StdTypeIdentity(nullptr),
320 FullyCheckedComparisonCategories(
321 static_cast<unsigned>(ComparisonCategoryType::Last) + 1),
322 StdSourceLocationImplDecl(nullptr), CXXTypeInfoDecl(nullptr),
323 GlobalNewDeleteDeclared(false), DisableTypoCorrection(false),
324 TyposCorrected(0), IsBuildingRecoveryCallExpr(false),
325 CurrentInstantiationScope(nullptr), NonInstantiationEntries(0),
326 ArgPackSubstIndex(std::nullopt), SatisfactionCache(Context) {
327 assert(pp.TUKind == TUKind);
328 TUScope = nullptr;
329
330 LoadedExternalKnownNamespaces = false;
331 for (unsigned I = 0; I != NSAPI::NumNSNumberLiteralMethods; ++I)
332 ObjC().NSNumberLiteralMethods[I] = nullptr;
333
334 if (getLangOpts().ObjC)
335 ObjC().NSAPIObj.reset(p: new NSAPI(Context));
336
337 if (getLangOpts().CPlusPlus)
338 FieldCollector.reset(p: new CXXFieldCollector());
339
340 // Tell diagnostics how to render things from the AST library.
341 Diags.SetArgToStringFn(Fn: &FormatASTNodeDiagnosticArgument, Cookie: &Context);
342
343 // This evaluation context exists to ensure that there's always at least one
344 // valid evaluation context available. It is never removed from the
345 // evaluation stack.
346 ExprEvalContexts.emplace_back(
347 Args: ExpressionEvaluationContext::PotentiallyEvaluated, Args: 0, Args: CleanupInfo{},
348 Args: nullptr, Args: ExpressionEvaluationContextRecord::EK_Other);
349
350 // Initialization of data sharing attributes stack for OpenMP
351 OpenMP().InitDataSharingAttributesStack();
352
353 std::unique_ptr<sema::SemaPPCallbacks> Callbacks =
354 std::make_unique<sema::SemaPPCallbacks>();
355 SemaPPCallbackHandler = Callbacks.get();
356 PP.addPPCallbacks(C: std::move(Callbacks));
357 SemaPPCallbackHandler->set(*this);
358
359 CurFPFeatures.setFPEvalMethod(PP.getCurrentFPEvalMethod());
360}
361
362// Anchor Sema's type info to this TU.
363void Sema::anchor() {}
364
365void Sema::addImplicitTypedef(StringRef Name, QualType T) {
366 DeclarationName DN = &Context.Idents.get(Name);
367 if (IdResolver.begin(Name: DN) == IdResolver.end())
368 PushOnScopeChains(D: Context.buildImplicitTypedef(T, Name), S: TUScope);
369}
370
371void Sema::Initialize() {
372 // Create BuiltinVaListDecl *before* ExternalSemaSource::InitializeSema(this)
373 // because during initialization ASTReader can emit globals that require
374 // name mangling. And the name mangling uses BuiltinVaListDecl.
375 if (Context.getTargetInfo().hasBuiltinMSVaList())
376 (void)Context.getBuiltinMSVaListDecl();
377 if (Context.getTargetInfo().hasBuiltinZOSVaList())
378 (void)Context.getBuiltinZOSVaListDecl();
379 (void)Context.getBuiltinVaListDecl();
380
381 if (SemaConsumer *SC = dyn_cast<SemaConsumer>(Val: &Consumer))
382 SC->InitializeSema(S&: *this);
383
384 // Tell the external Sema source about this Sema object.
385 if (ExternalSemaSource *ExternalSema
386 = dyn_cast_or_null<ExternalSemaSource>(Val: Context.getExternalSource()))
387 ExternalSema->InitializeSema(S&: *this);
388
389 // This needs to happen after ExternalSemaSource::InitializeSema(this) or we
390 // will not be able to merge any duplicate __va_list_tag decls correctly.
391 VAListTagName = PP.getIdentifierInfo(Name: "__va_list_tag");
392
393 if (!TUScope)
394 return;
395
396 // Initialize predefined 128-bit integer types, if needed.
397 if (Context.getTargetInfo().hasInt128Type() ||
398 (Context.getAuxTargetInfo() &&
399 Context.getAuxTargetInfo()->hasInt128Type())) {
400 // If either of the 128-bit integer types are unavailable to name lookup,
401 // define them now.
402 DeclarationName Int128 = &Context.Idents.get(Name: "__int128_t");
403 if (IdResolver.begin(Name: Int128) == IdResolver.end())
404 PushOnScopeChains(D: Context.getInt128Decl(), S: TUScope);
405
406 DeclarationName UInt128 = &Context.Idents.get(Name: "__uint128_t");
407 if (IdResolver.begin(Name: UInt128) == IdResolver.end())
408 PushOnScopeChains(D: Context.getUInt128Decl(), S: TUScope);
409 }
410
411
412 // Initialize predefined Objective-C types:
413 if (getLangOpts().ObjC) {
414 // If 'SEL' does not yet refer to any declarations, make it refer to the
415 // predefined 'SEL'.
416 DeclarationName SEL = &Context.Idents.get(Name: "SEL");
417 if (IdResolver.begin(Name: SEL) == IdResolver.end())
418 PushOnScopeChains(D: Context.getObjCSelDecl(), S: TUScope);
419
420 // If 'id' does not yet refer to any declarations, make it refer to the
421 // predefined 'id'.
422 DeclarationName Id = &Context.Idents.get(Name: "id");
423 if (IdResolver.begin(Name: Id) == IdResolver.end())
424 PushOnScopeChains(D: Context.getObjCIdDecl(), S: TUScope);
425
426 // Create the built-in typedef for 'Class'.
427 DeclarationName Class = &Context.Idents.get(Name: "Class");
428 if (IdResolver.begin(Name: Class) == IdResolver.end())
429 PushOnScopeChains(D: Context.getObjCClassDecl(), S: TUScope);
430
431 // Create the built-in forward declaratino for 'Protocol'.
432 DeclarationName Protocol = &Context.Idents.get(Name: "Protocol");
433 if (IdResolver.begin(Name: Protocol) == IdResolver.end())
434 PushOnScopeChains(D: Context.getObjCProtocolDecl(), S: TUScope);
435 }
436
437 // Create the internal type for the *StringMakeConstantString builtins.
438 DeclarationName ConstantString = &Context.Idents.get(Name: "__NSConstantString");
439 if (IdResolver.begin(Name: ConstantString) == IdResolver.end())
440 PushOnScopeChains(D: Context.getCFConstantStringDecl(), S: TUScope);
441
442 // Initialize Microsoft "predefined C++ types".
443 if (getLangOpts().MSVCCompat) {
444 if (getLangOpts().CPlusPlus &&
445 IdResolver.begin(Name: &Context.Idents.get(Name: "type_info")) == IdResolver.end())
446 PushOnScopeChains(D: Context.getMSTypeInfoTagDecl(), S: TUScope);
447
448 addImplicitTypedef(Name: "size_t", T: Context.getSizeType());
449 }
450
451 // Initialize predefined OpenCL types and supported extensions and (optional)
452 // core features.
453 if (getLangOpts().OpenCL) {
454 getOpenCLOptions().addSupport(
455 FeaturesMap: Context.getTargetInfo().getSupportedOpenCLOpts(), Opts: getLangOpts());
456 addImplicitTypedef(Name: "sampler_t", T: Context.OCLSamplerTy);
457 addImplicitTypedef(Name: "event_t", T: Context.OCLEventTy);
458 auto OCLCompatibleVersion = getLangOpts().getOpenCLCompatibleVersion();
459 if (OCLCompatibleVersion >= 200) {
460 if (getLangOpts().OpenCLCPlusPlus || getLangOpts().Blocks) {
461 addImplicitTypedef(Name: "clk_event_t", T: Context.OCLClkEventTy);
462 addImplicitTypedef(Name: "queue_t", T: Context.OCLQueueTy);
463 }
464 if (getLangOpts().OpenCLPipes)
465 addImplicitTypedef(Name: "reserve_id_t", T: Context.OCLReserveIDTy);
466 addImplicitTypedef(Name: "atomic_int", T: Context.getAtomicType(T: Context.IntTy));
467 addImplicitTypedef(Name: "atomic_uint",
468 T: Context.getAtomicType(T: Context.UnsignedIntTy));
469 addImplicitTypedef(Name: "atomic_float",
470 T: Context.getAtomicType(T: Context.FloatTy));
471 // OpenCLC v2.0, s6.13.11.6 requires that atomic_flag is implemented as
472 // 32-bit integer and OpenCLC v2.0, s6.1.1 int is always 32-bit wide.
473 addImplicitTypedef(Name: "atomic_flag", T: Context.getAtomicType(T: Context.IntTy));
474
475
476 // OpenCL v2.0 s6.13.11.6:
477 // - The atomic_long and atomic_ulong types are supported if the
478 // cl_khr_int64_base_atomics and cl_khr_int64_extended_atomics
479 // extensions are supported.
480 // - The atomic_double type is only supported if double precision
481 // is supported and the cl_khr_int64_base_atomics and
482 // cl_khr_int64_extended_atomics extensions are supported.
483 // - If the device address space is 64-bits, the data types
484 // atomic_intptr_t, atomic_uintptr_t, atomic_size_t and
485 // atomic_ptrdiff_t are supported if the cl_khr_int64_base_atomics and
486 // cl_khr_int64_extended_atomics extensions are supported.
487
488 auto AddPointerSizeDependentTypes = [&]() {
489 auto AtomicSizeT = Context.getAtomicType(T: Context.getSizeType());
490 auto AtomicIntPtrT = Context.getAtomicType(T: Context.getIntPtrType());
491 auto AtomicUIntPtrT = Context.getAtomicType(T: Context.getUIntPtrType());
492 auto AtomicPtrDiffT =
493 Context.getAtomicType(T: Context.getPointerDiffType());
494 addImplicitTypedef(Name: "atomic_size_t", T: AtomicSizeT);
495 addImplicitTypedef(Name: "atomic_intptr_t", T: AtomicIntPtrT);
496 addImplicitTypedef(Name: "atomic_uintptr_t", T: AtomicUIntPtrT);
497 addImplicitTypedef(Name: "atomic_ptrdiff_t", T: AtomicPtrDiffT);
498 };
499
500 if (Context.getTypeSize(T: Context.getSizeType()) == 32) {
501 AddPointerSizeDependentTypes();
502 }
503
504 if (getOpenCLOptions().isSupported(Ext: "cl_khr_fp16", LO: getLangOpts())) {
505 auto AtomicHalfT = Context.getAtomicType(T: Context.HalfTy);
506 addImplicitTypedef(Name: "atomic_half", T: AtomicHalfT);
507 }
508
509 std::vector<QualType> Atomic64BitTypes;
510 if (getOpenCLOptions().isSupported(Ext: "cl_khr_int64_base_atomics",
511 LO: getLangOpts()) &&
512 getOpenCLOptions().isSupported(Ext: "cl_khr_int64_extended_atomics",
513 LO: getLangOpts())) {
514 if (getOpenCLOptions().isSupported(Ext: "cl_khr_fp64", LO: getLangOpts())) {
515 auto AtomicDoubleT = Context.getAtomicType(T: Context.DoubleTy);
516 addImplicitTypedef(Name: "atomic_double", T: AtomicDoubleT);
517 Atomic64BitTypes.push_back(x: AtomicDoubleT);
518 }
519 auto AtomicLongT = Context.getAtomicType(T: Context.LongTy);
520 auto AtomicULongT = Context.getAtomicType(T: Context.UnsignedLongTy);
521 addImplicitTypedef(Name: "atomic_long", T: AtomicLongT);
522 addImplicitTypedef(Name: "atomic_ulong", T: AtomicULongT);
523
524
525 if (Context.getTypeSize(T: Context.getSizeType()) == 64) {
526 AddPointerSizeDependentTypes();
527 }
528 }
529 }
530
531#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
532 if (getOpenCLOptions().isSupported(#Ext, getLangOpts())) { \
533 addImplicitTypedef(#ExtType, Context.Id##Ty); \
534 }
535#include "clang/Basic/OpenCLExtensionTypes.def"
536 }
537
538 if (Context.getTargetInfo().hasAArch64ACLETypes() ||
539 (Context.getAuxTargetInfo() &&
540 Context.getAuxTargetInfo()->hasAArch64ACLETypes())) {
541#define SVE_TYPE(Name, Id, SingletonId) \
542 addImplicitTypedef(#Name, Context.SingletonId);
543#define NEON_VECTOR_TYPE(Name, BaseType, ElBits, NumEls, VectorKind) \
544 addImplicitTypedef( \
545 #Name, Context.getVectorType(Context.BaseType, NumEls, VectorKind));
546#include "clang/Basic/AArch64ACLETypes.def"
547 }
548
549 if (Context.getTargetInfo().getTriple().isPPC64()) {
550#define PPC_VECTOR_MMA_TYPE(Name, Id, Size) \
551 addImplicitTypedef(#Name, Context.Id##Ty);
552#include "clang/Basic/PPCTypes.def"
553#define PPC_VECTOR_VSX_TYPE(Name, Id, Size) \
554 addImplicitTypedef(#Name, Context.Id##Ty);
555#include "clang/Basic/PPCTypes.def"
556 }
557
558 if (Context.getTargetInfo().hasRISCVVTypes()) {
559#define RVV_TYPE(Name, Id, SingletonId) \
560 addImplicitTypedef(Name, Context.SingletonId);
561#include "clang/Basic/RISCVVTypes.def"
562 }
563
564 if (Context.getTargetInfo().getTriple().isWasm() &&
565 Context.getTargetInfo().hasFeature(Feature: "reference-types")) {
566#define WASM_TYPE(Name, Id, SingletonId) \
567 addImplicitTypedef(Name, Context.SingletonId);
568#include "clang/Basic/WebAssemblyReferenceTypes.def"
569 }
570
571 if (Context.getTargetInfo().getTriple().isAMDGPU() ||
572 (Context.getTargetInfo().getTriple().isSPIRV() &&
573 Context.getTargetInfo().getTriple().getVendor() == llvm::Triple::AMD) ||
574 (Context.getAuxTargetInfo() &&
575 (Context.getAuxTargetInfo()->getTriple().isAMDGPU() ||
576 (Context.getAuxTargetInfo()->getTriple().isSPIRV() &&
577 Context.getAuxTargetInfo()->getTriple().getVendor() ==
578 llvm::Triple::AMD)))) {
579#define AMDGPU_TYPE(Name, Id, SingletonId, Width, Align) \
580 addImplicitTypedef(Name, Context.SingletonId);
581#include "clang/Basic/AMDGPUTypes.def"
582 }
583
584 if (Context.getTargetInfo().hasBuiltinMSVaList()) {
585 DeclarationName MSVaList = &Context.Idents.get(Name: "__builtin_ms_va_list");
586 if (IdResolver.begin(Name: MSVaList) == IdResolver.end())
587 PushOnScopeChains(D: Context.getBuiltinMSVaListDecl(), S: TUScope);
588 }
589
590 if (Context.getTargetInfo().hasBuiltinZOSVaList()) {
591 DeclarationName ZOSVaList = &Context.Idents.get(Name: "__builtin_zos_va_list");
592 if (IdResolver.begin(Name: ZOSVaList) == IdResolver.end())
593 PushOnScopeChains(D: Context.getBuiltinZOSVaListDecl(), S: TUScope);
594 }
595
596 DeclarationName BuiltinVaList = &Context.Idents.get(Name: "__builtin_va_list");
597 if (IdResolver.begin(Name: BuiltinVaList) == IdResolver.end())
598 PushOnScopeChains(D: Context.getBuiltinVaListDecl(), S: TUScope);
599}
600
601Sema::~Sema() {
602 assert(InstantiatingSpecializations.empty() &&
603 "failed to clean up an InstantiatingTemplate?");
604
605 if (VisContext) FreeVisContext();
606
607 // Kill all the active scopes.
608 for (sema::FunctionScopeInfo *FSI : FunctionScopes)
609 delete FSI;
610
611 // Tell the SemaConsumer to forget about us; we're going out of scope.
612 if (SemaConsumer *SC = dyn_cast<SemaConsumer>(Val: &Consumer))
613 SC->ForgetSema();
614
615 // Detach from the external Sema source.
616 if (ExternalSemaSource *ExternalSema
617 = dyn_cast_or_null<ExternalSemaSource>(Val: Context.getExternalSource()))
618 ExternalSema->ForgetSema();
619
620 // Delete cached satisfactions.
621 std::vector<ConstraintSatisfaction *> Satisfactions;
622 Satisfactions.reserve(n: SatisfactionCache.size());
623 for (auto &Node : SatisfactionCache)
624 Satisfactions.push_back(x: &Node);
625 for (auto *Node : Satisfactions)
626 delete Node;
627
628 threadSafety::threadSafetyCleanup(Cache: ThreadSafetyDeclCache);
629
630 // Destroys data sharing attributes stack for OpenMP
631 OpenMP().DestroyDataSharingAttributesStack();
632
633 // Detach from the PP callback handler which outlives Sema since it's owned
634 // by the preprocessor.
635 SemaPPCallbackHandler->reset();
636}
637
638void Sema::runWithSufficientStackSpace(SourceLocation Loc,
639 llvm::function_ref<void()> Fn) {
640 StackHandler.runWithSufficientStackSpace(Loc, Fn);
641}
642
643bool Sema::makeUnavailableInSystemHeader(SourceLocation loc,
644 UnavailableAttr::ImplicitReason reason) {
645 // If we're not in a function, it's an error.
646 FunctionDecl *fn = dyn_cast<FunctionDecl>(Val: CurContext);
647 if (!fn) return false;
648
649 // If we're in template instantiation, it's an error.
650 if (inTemplateInstantiation())
651 return false;
652
653 // If that function's not in a system header, it's an error.
654 if (!Context.getSourceManager().isInSystemHeader(Loc: loc))
655 return false;
656
657 // If the function is already unavailable, it's not an error.
658 if (fn->hasAttr<UnavailableAttr>()) return true;
659
660 fn->addAttr(A: UnavailableAttr::CreateImplicit(Ctx&: Context, Message: "", ImplicitReason: reason, Range: loc));
661 return true;
662}
663
664ASTMutationListener *Sema::getASTMutationListener() const {
665 return getASTConsumer().GetASTMutationListener();
666}
667
668void Sema::addExternalSource(IntrusiveRefCntPtr<ExternalSemaSource> E) {
669 assert(E && "Cannot use with NULL ptr");
670
671 if (!ExternalSource) {
672 ExternalSource = std::move(E);
673 return;
674 }
675
676 if (auto *Ex = dyn_cast<MultiplexExternalSemaSource>(Val: ExternalSource.get()))
677 Ex->AddSource(Source: std::move(E));
678 else
679 ExternalSource = llvm::makeIntrusiveRefCnt<MultiplexExternalSemaSource>(
680 A&: ExternalSource, A: std::move(E));
681}
682
683void Sema::PrintStats() const {
684 llvm::errs() << "\n*** Semantic Analysis Stats:\n";
685 if (SFINAETrap *Trap = getSFINAEContext())
686 llvm::errs() << int(Trap->hasErrorOccurred())
687 << " SFINAE diagnostics trapped.\n";
688
689 BumpAlloc.PrintStats();
690 AnalysisWarnings.PrintStats();
691}
692
693void Sema::diagnoseNullableToNonnullConversion(QualType DstType,
694 QualType SrcType,
695 SourceLocation Loc) {
696 NullabilityKindOrNone ExprNullability = SrcType->getNullability();
697 if (!ExprNullability || (*ExprNullability != NullabilityKind::Nullable &&
698 *ExprNullability != NullabilityKind::NullableResult))
699 return;
700
701 NullabilityKindOrNone TypeNullability = DstType->getNullability();
702 if (!TypeNullability || *TypeNullability != NullabilityKind::NonNull)
703 return;
704
705 Diag(Loc, DiagID: diag::warn_nullability_lost) << SrcType << DstType;
706}
707
708// Generate diagnostics when adding or removing effects in a type conversion.
709void Sema::diagnoseFunctionEffectConversion(QualType DstType, QualType SrcType,
710 SourceLocation Loc) {
711 const auto SrcFX = FunctionEffectsRef::get(QT: SrcType);
712 const auto DstFX = FunctionEffectsRef::get(QT: DstType);
713 if (SrcFX != DstFX) {
714 for (const auto &Diff : FunctionEffectDiffVector(SrcFX, DstFX)) {
715 if (Diff.shouldDiagnoseConversion(SrcType, SrcFX, DstType, DstFX))
716 Diag(Loc, DiagID: diag::warn_invalid_add_func_effects) << Diff.effectName();
717 }
718 }
719}
720
721void Sema::diagnoseZeroToNullptrConversion(CastKind Kind, const Expr *E) {
722 // nullptr only exists from C++11 on, so don't warn on its absence earlier.
723 if (!getLangOpts().CPlusPlus11)
724 return;
725
726 if (Kind != CK_NullToPointer && Kind != CK_NullToMemberPointer)
727 return;
728
729 const Expr *EStripped = E->IgnoreParenImpCasts();
730 if (EStripped->getType()->isNullPtrType())
731 return;
732 if (isa<GNUNullExpr>(Val: EStripped))
733 return;
734
735 if (Diags.isIgnored(DiagID: diag::warn_zero_as_null_pointer_constant,
736 Loc: E->getBeginLoc()))
737 return;
738
739 // Don't diagnose the conversion from a 0 literal to a null pointer argument
740 // in a synthesized call to operator<=>.
741 if (!CodeSynthesisContexts.empty() &&
742 CodeSynthesisContexts.back().Kind ==
743 CodeSynthesisContext::RewritingOperatorAsSpaceship)
744 return;
745
746 // Ignore null pointers in defaulted comparison operators.
747 FunctionDecl *FD = getCurFunctionDecl();
748 if (FD && FD->isDefaulted()) {
749 return;
750 }
751
752 // If it is a macro from system header, and if the macro name is not "NULL",
753 // do not warn.
754 // Note that uses of "NULL" will be ignored above on systems that define it
755 // as __null.
756 SourceLocation MaybeMacroLoc = E->getBeginLoc();
757 if (Diags.getSuppressSystemWarnings() &&
758 SourceMgr.isInSystemMacro(loc: MaybeMacroLoc) &&
759 !findMacroSpelling(loc&: MaybeMacroLoc, name: "NULL"))
760 return;
761
762 Diag(Loc: E->getBeginLoc(), DiagID: diag::warn_zero_as_null_pointer_constant)
763 << FixItHint::CreateReplacement(RemoveRange: E->getSourceRange(), Code: "nullptr");
764}
765
766/// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit cast.
767/// If there is already an implicit cast, merge into the existing one.
768/// The result is of the given category.
769ExprResult Sema::ImpCastExprToType(Expr *E, QualType Ty,
770 CastKind Kind, ExprValueKind VK,
771 const CXXCastPath *BasePath,
772 CheckedConversionKind CCK) {
773#ifndef NDEBUG
774 if (VK == VK_PRValue && !E->isPRValue()) {
775 switch (Kind) {
776 default:
777 llvm_unreachable(
778 ("can't implicitly cast glvalue to prvalue with this cast "
779 "kind: " +
780 std::string(CastExpr::getCastKindName(Kind)))
781 .c_str());
782 case CK_Dependent:
783 case CK_LValueToRValue:
784 case CK_ArrayToPointerDecay:
785 case CK_FunctionToPointerDecay:
786 case CK_ToVoid:
787 case CK_NonAtomicToAtomic:
788 case CK_HLSLArrayRValue:
789 case CK_HLSLAggregateSplatCast:
790 break;
791 }
792 }
793 assert((VK == VK_PRValue || Kind == CK_Dependent || !E->isPRValue()) &&
794 "can't cast prvalue to glvalue");
795#endif
796
797 diagnoseNullableToNonnullConversion(DstType: Ty, SrcType: E->getType(), Loc: E->getBeginLoc());
798 diagnoseZeroToNullptrConversion(Kind, E);
799 if (Context.hasAnyFunctionEffects() && !isCast(CCK) &&
800 Kind != CK_NullToPointer && Kind != CK_NullToMemberPointer)
801 diagnoseFunctionEffectConversion(DstType: Ty, SrcType: E->getType(), Loc: E->getBeginLoc());
802
803 QualType ExprTy = Context.getCanonicalType(T: E->getType());
804 QualType TypeTy = Context.getCanonicalType(T: Ty);
805
806 // This cast is used in place of a regular LValue to RValue cast for
807 // HLSL Array Parameter Types. It needs to be emitted even if
808 // ExprTy == TypeTy, except if E is an HLSLOutArgExpr
809 // Emitting a cast in that case will prevent HLSLOutArgExpr from
810 // being handled properly in EmitCallArg
811 if (Kind == CK_HLSLArrayRValue && !isa<HLSLOutArgExpr>(Val: E))
812 return ImplicitCastExpr::Create(Context, T: Ty, Kind, Operand: E, BasePath, Cat: VK,
813 FPO: CurFPFeatureOverrides());
814
815 if (ExprTy == TypeTy)
816 return E;
817
818 if (Kind == CK_ArrayToPointerDecay) {
819 // C++1z [conv.array]: The temporary materialization conversion is applied.
820 // We also use this to fuel C++ DR1213, which applies to C++11 onwards.
821 if (getLangOpts().CPlusPlus && E->isPRValue()) {
822 // The temporary is an lvalue in C++98 and an xvalue otherwise.
823 ExprResult Materialized = CreateMaterializeTemporaryExpr(
824 T: E->getType(), Temporary: E, BoundToLvalueReference: !getLangOpts().CPlusPlus11);
825 if (Materialized.isInvalid())
826 return ExprError();
827 E = Materialized.get();
828 }
829 // C17 6.7.1p6 footnote 124: The implementation can treat any register
830 // declaration simply as an auto declaration. However, whether or not
831 // addressable storage is actually used, the address of any part of an
832 // object declared with storage-class specifier register cannot be
833 // computed, either explicitly(by use of the unary & operator as discussed
834 // in 6.5.3.2) or implicitly(by converting an array name to a pointer as
835 // discussed in 6.3.2.1).Thus, the only operator that can be applied to an
836 // array declared with storage-class specifier register is sizeof.
837 if (VK == VK_PRValue && !getLangOpts().CPlusPlus && !E->isPRValue()) {
838 if (const auto *DRE = dyn_cast<DeclRefExpr>(Val: E)) {
839 if (const auto *VD = dyn_cast<VarDecl>(Val: DRE->getDecl())) {
840 if (VD->getStorageClass() == SC_Register) {
841 Diag(Loc: E->getExprLoc(), DiagID: diag::err_typecheck_address_of)
842 << /*register variable*/ 3 << E->getSourceRange();
843 return ExprError();
844 }
845 }
846 }
847 }
848 }
849
850 if (ImplicitCastExpr *ImpCast = dyn_cast<ImplicitCastExpr>(Val: E)) {
851 if (ImpCast->getCastKind() == Kind && (!BasePath || BasePath->empty())) {
852 ImpCast->setType(Ty);
853 ImpCast->setValueKind(VK);
854 return E;
855 }
856 }
857
858 bool IsExplicitCast = isa<CStyleCastExpr>(Val: E) || isa<CXXStaticCastExpr>(Val: E) ||
859 isa<CXXFunctionalCastExpr>(Val: E);
860
861 if ((Kind == CK_IntegralCast || Kind == CK_IntegralToBoolean ||
862 (Kind == CK_NoOp && E->getType()->isIntegerType() &&
863 Ty->isIntegerType())) &&
864 IsExplicitCast) {
865 if (const auto *SourceOBT = E->getType()->getAs<OverflowBehaviorType>()) {
866 if (Ty->isIntegerType() && !Ty->isOverflowBehaviorType()) {
867 Ty = Context.getOverflowBehaviorType(Kind: SourceOBT->getBehaviorKind(), Wrapped: Ty);
868 }
869 }
870 }
871
872 return ImplicitCastExpr::Create(Context, T: Ty, Kind, Operand: E, BasePath, Cat: VK,
873 FPO: CurFPFeatureOverrides());
874}
875
876CastKind Sema::ScalarTypeToBooleanCastKind(QualType ScalarTy) {
877 switch (ScalarTy->getScalarTypeKind()) {
878 case Type::STK_Bool: return CK_NoOp;
879 case Type::STK_CPointer: return CK_PointerToBoolean;
880 case Type::STK_BlockPointer: return CK_PointerToBoolean;
881 case Type::STK_ObjCObjectPointer: return CK_PointerToBoolean;
882 case Type::STK_MemberPointer: return CK_MemberPointerToBoolean;
883 case Type::STK_Integral: return CK_IntegralToBoolean;
884 case Type::STK_Floating: return CK_FloatingToBoolean;
885 case Type::STK_IntegralComplex: return CK_IntegralComplexToBoolean;
886 case Type::STK_FloatingComplex: return CK_FloatingComplexToBoolean;
887 case Type::STK_FixedPoint: return CK_FixedPointToBoolean;
888 }
889 llvm_unreachable("unknown scalar type kind");
890}
891
892/// Used to prune the decls of Sema's UnusedFileScopedDecls vector.
893static bool ShouldRemoveFromUnused(Sema *SemaRef, const DeclaratorDecl *D) {
894 if (D->getMostRecentDecl()->isUsed())
895 return true;
896
897 if (D->isExternallyVisible())
898 return true;
899
900 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Val: D)) {
901 // If this is a function template and none of its specializations is used,
902 // we should warn.
903 if (FunctionTemplateDecl *Template = FD->getDescribedFunctionTemplate())
904 for (const auto *Spec : Template->specializations())
905 if (ShouldRemoveFromUnused(SemaRef, D: Spec))
906 return true;
907
908 // UnusedFileScopedDecls stores the first declaration.
909 // The declaration may have become definition so check again.
910 const FunctionDecl *DeclToCheck;
911 if (FD->hasBody(Definition&: DeclToCheck))
912 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(D: DeclToCheck);
913
914 // Later redecls may add new information resulting in not having to warn,
915 // so check again.
916 DeclToCheck = FD->getMostRecentDecl();
917 if (DeclToCheck != FD)
918 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(D: DeclToCheck);
919 }
920
921 if (const VarDecl *VD = dyn_cast<VarDecl>(Val: D)) {
922 // If a variable usable in constant expressions is referenced,
923 // don't warn if it isn't used: if the value of a variable is required
924 // for the computation of a constant expression, it doesn't make sense to
925 // warn even if the variable isn't odr-used. (isReferenced doesn't
926 // precisely reflect that, but it's a decent approximation.)
927 if (VD->isReferenced() &&
928 VD->mightBeUsableInConstantExpressions(C: SemaRef->Context))
929 return true;
930
931 if (VarTemplateDecl *Template = VD->getDescribedVarTemplate())
932 // If this is a variable template and none of its specializations is used,
933 // we should warn.
934 for (const auto *Spec : Template->specializations())
935 if (ShouldRemoveFromUnused(SemaRef, D: Spec))
936 return true;
937
938 // UnusedFileScopedDecls stores the first declaration.
939 // The declaration may have become definition so check again.
940 const VarDecl *DeclToCheck = VD->getDefinition();
941 if (DeclToCheck)
942 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(D: DeclToCheck);
943
944 // Later redecls may add new information resulting in not having to warn,
945 // so check again.
946 DeclToCheck = VD->getMostRecentDecl();
947 if (DeclToCheck != VD)
948 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(D: DeclToCheck);
949 }
950
951 return false;
952}
953
954static bool isFunctionOrVarDeclExternC(const NamedDecl *ND) {
955 if (const auto *FD = dyn_cast<FunctionDecl>(Val: ND))
956 return FD->isExternC();
957 return cast<VarDecl>(Val: ND)->isExternC();
958}
959
960/// Determine whether ND is an external-linkage function or variable whose
961/// type has no linkage.
962bool Sema::isExternalWithNoLinkageType(const ValueDecl *VD) const {
963 // Note: it's not quite enough to check whether VD has UniqueExternalLinkage,
964 // because we also want to catch the case where its type has VisibleNoLinkage,
965 // which does not affect the linkage of VD.
966 return getLangOpts().CPlusPlus && VD->hasExternalFormalLinkage() &&
967 !isExternalFormalLinkage(L: VD->getType()->getLinkage()) &&
968 !isFunctionOrVarDeclExternC(ND: VD);
969}
970
971bool Sema::isMainFileLoc(SourceLocation Loc) const {
972 if (TUKind != TU_Complete || getLangOpts().IsHeaderFile)
973 return false;
974 return SourceMgr.isInMainFile(Loc);
975}
976
977/// Obtains a sorted list of functions and variables that are undefined but
978/// ODR-used.
979void Sema::getUndefinedButUsed(
980 SmallVectorImpl<std::pair<NamedDecl *, SourceLocation> > &Undefined) {
981 for (const auto &UndefinedUse : UndefinedButUsed) {
982 NamedDecl *ND = UndefinedUse.first;
983
984 // Ignore attributes that have become invalid.
985 if (ND->isInvalidDecl()) continue;
986
987 // __attribute__((weakref)) is basically a definition.
988 if (ND->hasAttr<WeakRefAttr>()) continue;
989
990 if (isa<CXXDeductionGuideDecl>(Val: ND))
991 continue;
992
993 if (ND->hasAttr<DLLImportAttr>() || ND->hasAttr<DLLExportAttr>()) {
994 // An exported function will always be emitted when defined, so even if
995 // the function is inline, it doesn't have to be emitted in this TU. An
996 // imported function implies that it has been exported somewhere else.
997 continue;
998 }
999
1000 if (const auto *FD = dyn_cast<FunctionDecl>(Val: ND)) {
1001 if (FD->isDefined())
1002 continue;
1003 if (FD->isExternallyVisible() &&
1004 !isExternalWithNoLinkageType(VD: FD) &&
1005 !FD->getMostRecentDecl()->isInlined() &&
1006 !FD->hasAttr<ExcludeFromExplicitInstantiationAttr>())
1007 continue;
1008 if (FD->getBuiltinID())
1009 continue;
1010 } else {
1011 const auto *VD = cast<VarDecl>(Val: ND);
1012 if (VD->hasDefinition() != VarDecl::DeclarationOnly)
1013 continue;
1014 if (VD->isExternallyVisible() &&
1015 !isExternalWithNoLinkageType(VD) &&
1016 !VD->getMostRecentDecl()->isInline() &&
1017 !VD->hasAttr<ExcludeFromExplicitInstantiationAttr>())
1018 continue;
1019
1020 // Skip VarDecls that lack formal definitions but which we know are in
1021 // fact defined somewhere.
1022 if (VD->isKnownToBeDefined())
1023 continue;
1024 }
1025
1026 Undefined.push_back(Elt: std::make_pair(x&: ND, y: UndefinedUse.second));
1027 }
1028}
1029
1030/// checkUndefinedButUsed - Check for undefined objects with internal linkage
1031/// or that are inline.
1032static void checkUndefinedButUsed(Sema &S) {
1033 if (S.UndefinedButUsed.empty()) return;
1034
1035 // Collect all the still-undefined entities with internal linkage.
1036 SmallVector<std::pair<NamedDecl *, SourceLocation>, 16> Undefined;
1037 S.getUndefinedButUsed(Undefined);
1038 S.UndefinedButUsed.clear();
1039 if (Undefined.empty()) return;
1040
1041 for (const auto &Undef : Undefined) {
1042 ValueDecl *VD = cast<ValueDecl>(Val: Undef.first);
1043 SourceLocation UseLoc = Undef.second;
1044
1045 if (S.isExternalWithNoLinkageType(VD)) {
1046 // C++ [basic.link]p8:
1047 // A type without linkage shall not be used as the type of a variable
1048 // or function with external linkage unless
1049 // -- the entity has C language linkage
1050 // -- the entity is not odr-used or is defined in the same TU
1051 //
1052 // As an extension, accept this in cases where the type is externally
1053 // visible, since the function or variable actually can be defined in
1054 // another translation unit in that case.
1055 S.Diag(Loc: VD->getLocation(), DiagID: isExternallyVisible(L: VD->getType()->getLinkage())
1056 ? diag::ext_undefined_internal_type
1057 : diag::err_undefined_internal_type)
1058 << isa<VarDecl>(Val: VD) << VD;
1059 } else if (!VD->isExternallyVisible()) {
1060 // FIXME: We can promote this to an error. The function or variable can't
1061 // be defined anywhere else, so the program must necessarily violate the
1062 // one definition rule.
1063 bool IsImplicitBase = false;
1064 if (const auto *BaseD = dyn_cast<FunctionDecl>(Val: VD)) {
1065 auto *DVAttr = BaseD->getAttr<OMPDeclareVariantAttr>();
1066 if (DVAttr && !DVAttr->getTraitInfo().isExtensionActive(
1067 TP: llvm::omp::TraitProperty::
1068 implementation_extension_disable_implicit_base)) {
1069 const auto *Func = cast<FunctionDecl>(
1070 Val: cast<DeclRefExpr>(Val: DVAttr->getVariantFuncRef())->getDecl());
1071 IsImplicitBase = BaseD->isImplicit() &&
1072 Func->getIdentifier()->isMangledOpenMPVariantName();
1073 }
1074 }
1075 if (!S.getLangOpts().OpenMP || !IsImplicitBase)
1076 S.Diag(Loc: VD->getLocation(), DiagID: diag::warn_undefined_internal)
1077 << isa<VarDecl>(Val: VD) << VD;
1078 } else if (auto *FD = dyn_cast<FunctionDecl>(Val: VD)) {
1079 (void)FD;
1080 assert(FD->getMostRecentDecl()->isInlined() &&
1081 "used object requires definition but isn't inline or internal?");
1082 // FIXME: This is ill-formed; we should reject.
1083 S.Diag(Loc: VD->getLocation(), DiagID: diag::warn_undefined_inline) << VD;
1084 } else {
1085 assert(cast<VarDecl>(VD)->getMostRecentDecl()->isInline() &&
1086 "used var requires definition but isn't inline or internal?");
1087 S.Diag(Loc: VD->getLocation(), DiagID: diag::err_undefined_inline_var) << VD;
1088 }
1089 if (UseLoc.isValid())
1090 S.Diag(Loc: UseLoc, DiagID: diag::note_used_here);
1091 }
1092}
1093
1094void Sema::LoadExternalWeakUndeclaredIdentifiers() {
1095 if (!ExternalSource)
1096 return;
1097
1098 SmallVector<std::pair<IdentifierInfo *, WeakInfo>, 4> WeakIDs;
1099 ExternalSource->ReadWeakUndeclaredIdentifiers(WI&: WeakIDs);
1100 for (auto &WeakID : WeakIDs)
1101 (void)WeakUndeclaredIdentifiers[WeakID.first].insert(X: WeakID.second);
1102}
1103
1104void Sema::LoadExternalExtnameUndeclaredIdentifiers() {
1105 if (!ExternalSource)
1106 return;
1107
1108 SmallVector<std::pair<IdentifierInfo *, AsmLabelAttr *>, 4> ExtnameIDs;
1109 ExternalSource->ReadExtnameUndeclaredIdentifiers(EI&: ExtnameIDs);
1110 for (auto &ExtnameID : ExtnameIDs)
1111 ExtnameUndeclaredIdentifiers[ExtnameID.first] = ExtnameID.second;
1112}
1113
1114typedef llvm::DenseMap<const CXXRecordDecl*, bool> RecordCompleteMap;
1115
1116/// Returns true, if all methods and nested classes of the given
1117/// CXXRecordDecl are defined in this translation unit.
1118///
1119/// Should only be called from ActOnEndOfTranslationUnit so that all
1120/// definitions are actually read.
1121static bool MethodsAndNestedClassesComplete(const CXXRecordDecl *RD,
1122 RecordCompleteMap &MNCComplete) {
1123 RecordCompleteMap::iterator Cache = MNCComplete.find(Val: RD);
1124 if (Cache != MNCComplete.end())
1125 return Cache->second;
1126 if (!RD->isCompleteDefinition())
1127 return false;
1128 bool Complete = true;
1129 for (DeclContext::decl_iterator I = RD->decls_begin(),
1130 E = RD->decls_end();
1131 I != E && Complete; ++I) {
1132 if (const CXXMethodDecl *M = dyn_cast<CXXMethodDecl>(Val: *I))
1133 Complete = M->isDefined() || M->isDefaulted() ||
1134 (M->isPureVirtual() && !isa<CXXDestructorDecl>(Val: M));
1135 else if (const FunctionTemplateDecl *F = dyn_cast<FunctionTemplateDecl>(Val: *I))
1136 // If the template function is marked as late template parsed at this
1137 // point, it has not been instantiated and therefore we have not
1138 // performed semantic analysis on it yet, so we cannot know if the type
1139 // can be considered complete.
1140 Complete = !F->getTemplatedDecl()->isLateTemplateParsed() &&
1141 F->getTemplatedDecl()->isDefined();
1142 else if (const CXXRecordDecl *R = dyn_cast<CXXRecordDecl>(Val: *I)) {
1143 if (R->isInjectedClassName())
1144 continue;
1145 if (R->hasDefinition())
1146 Complete = MethodsAndNestedClassesComplete(RD: R->getDefinition(),
1147 MNCComplete);
1148 else
1149 Complete = false;
1150 }
1151 }
1152 MNCComplete[RD] = Complete;
1153 return Complete;
1154}
1155
1156/// Returns true, if the given CXXRecordDecl is fully defined in this
1157/// translation unit, i.e. all methods are defined or pure virtual and all
1158/// friends, friend functions and nested classes are fully defined in this
1159/// translation unit.
1160///
1161/// Should only be called from ActOnEndOfTranslationUnit so that all
1162/// definitions are actually read.
1163static bool IsRecordFullyDefined(const CXXRecordDecl *RD,
1164 RecordCompleteMap &RecordsComplete,
1165 RecordCompleteMap &MNCComplete) {
1166 RecordCompleteMap::iterator Cache = RecordsComplete.find(Val: RD);
1167 if (Cache != RecordsComplete.end())
1168 return Cache->second;
1169 bool Complete = MethodsAndNestedClassesComplete(RD, MNCComplete);
1170 for (CXXRecordDecl::friend_iterator I = RD->friend_begin(),
1171 E = RD->friend_end();
1172 I != E && Complete; ++I) {
1173 // Check if friend classes and methods are complete.
1174 if (TypeSourceInfo *TSI = (*I)->getFriendType()) {
1175 // Friend classes are available as the TypeSourceInfo of the FriendDecl.
1176 if (CXXRecordDecl *FriendD = TSI->getType()->getAsCXXRecordDecl())
1177 Complete = MethodsAndNestedClassesComplete(RD: FriendD, MNCComplete);
1178 else
1179 Complete = false;
1180 } else {
1181 // Friend functions are available through the NamedDecl of FriendDecl.
1182 if (const FunctionDecl *FD =
1183 dyn_cast<FunctionDecl>(Val: (*I)->getFriendDecl()))
1184 Complete = FD->isDefined();
1185 else
1186 // This is a template friend, give up.
1187 Complete = false;
1188 }
1189 }
1190 RecordsComplete[RD] = Complete;
1191 return Complete;
1192}
1193
1194void Sema::getSortedUnusedLocalTypedefNameCandidates(
1195 SmallVectorImpl<const TypedefNameDecl *> &Sorted) const {
1196 // The candidates are collected while iterating a Scope's SmallPtrSet, so sort
1197 // by source location for a deterministic order.
1198 Sorted.assign(in_start: UnusedLocalTypedefNameCandidates.begin(),
1199 in_end: UnusedLocalTypedefNameCandidates.end());
1200 llvm::sort(C&: Sorted,
1201 Comp: [](const TypedefNameDecl *LHS, const TypedefNameDecl *RHS) {
1202 return LHS->getLocation().getRawEncoding() <
1203 RHS->getLocation().getRawEncoding();
1204 });
1205}
1206
1207void Sema::emitAndClearUnusedLocalTypedefWarnings() {
1208 if (ExternalSource)
1209 ExternalSource->ReadUnusedLocalTypedefNameCandidates(
1210 Decls&: UnusedLocalTypedefNameCandidates);
1211 SmallVector<const TypedefNameDecl *, 4> Sorted;
1212 getSortedUnusedLocalTypedefNameCandidates(Sorted);
1213 for (const TypedefNameDecl *TD : Sorted) {
1214 if (TD->isReferenced())
1215 continue;
1216 Diag(Loc: TD->getLocation(), DiagID: diag::warn_unused_local_typedef)
1217 << isa<TypeAliasDecl>(Val: TD) << TD->getDeclName();
1218 }
1219 UnusedLocalTypedefNameCandidates.clear();
1220}
1221
1222void Sema::ActOnStartOfTranslationUnit() {
1223 if (getLangOpts().CPlusPlusModules &&
1224 getLangOpts().getCompilingModule() == LangOptions::CMK_HeaderUnit)
1225 HandleStartOfHeaderUnit();
1226}
1227
1228void Sema::ActOnEndOfTranslationUnitFragment(TUFragmentKind Kind) {
1229 if (Kind == TUFragmentKind::Global) {
1230 // Perform Pending Instantiations at the end of global module fragment so
1231 // that the module ownership of TU-level decls won't get messed.
1232 llvm::TimeTraceScope TimeScope("PerformPendingInstantiations");
1233 PerformPendingInstantiations();
1234 return;
1235 }
1236
1237 // Transfer late parsed template instantiations over to the pending template
1238 // instantiation list. During normal compilation, the late template parser
1239 // will be installed and instantiating these templates will succeed.
1240 //
1241 // If we are building a TU prefix for serialization, it is also safe to
1242 // transfer these over, even though they are not parsed. The end of the TU
1243 // should be outside of any eager template instantiation scope, so when this
1244 // AST is deserialized, these templates will not be parsed until the end of
1245 // the combined TU.
1246 PendingInstantiations.insert(position: PendingInstantiations.end(),
1247 first: LateParsedInstantiations.begin(),
1248 last: LateParsedInstantiations.end());
1249 LateParsedInstantiations.clear();
1250
1251 // If DefinedUsedVTables ends up marking any virtual member functions it
1252 // might lead to more pending template instantiations, which we then need
1253 // to instantiate.
1254 DefineUsedVTables();
1255
1256 // C++: Perform implicit template instantiations.
1257 //
1258 // FIXME: When we perform these implicit instantiations, we do not
1259 // carefully keep track of the point of instantiation (C++ [temp.point]).
1260 // This means that name lookup that occurs within the template
1261 // instantiation will always happen at the end of the translation unit,
1262 // so it will find some names that are not required to be found. This is
1263 // valid, but we could do better by diagnosing if an instantiation uses a
1264 // name that was not visible at its first point of instantiation.
1265 if (ExternalSource) {
1266 // Load pending instantiations from the external source.
1267 SmallVector<PendingImplicitInstantiation, 4> Pending;
1268 ExternalSource->ReadPendingInstantiations(Pending);
1269 for (auto PII : Pending)
1270 if (auto Func = dyn_cast<FunctionDecl>(Val: PII.first))
1271 Func->setInstantiationIsPending(true);
1272 PendingInstantiations.insert(position: PendingInstantiations.begin(),
1273 first: Pending.begin(), last: Pending.end());
1274 }
1275
1276 {
1277 llvm::TimeTraceScope TimeScope("PerformPendingInstantiations");
1278 PerformPendingInstantiations();
1279 }
1280
1281 emitDeferredDiags();
1282
1283 assert(LateParsedInstantiations.empty() &&
1284 "end of TU template instantiation should not create more "
1285 "late-parsed templates");
1286}
1287
1288void Sema::ActOnEndOfTranslationUnit() {
1289 assert(DelayedDiagnostics.getCurrentPool() == nullptr
1290 && "reached end of translation unit with a pool attached?");
1291
1292 // If code completion is enabled, don't perform any end-of-translation-unit
1293 // work.
1294 if (PP.isCodeCompletionEnabled())
1295 return;
1296
1297 // Complete translation units and modules define vtables and perform implicit
1298 // instantiations. PCH files do not.
1299 if (TUKind != TU_Prefix) {
1300 ObjC().DiagnoseUseOfUnimplementedSelectors();
1301
1302 ActOnEndOfTranslationUnitFragment(
1303 Kind: !ModuleScopes.empty() && ModuleScopes.back().Module->Kind ==
1304 Module::PrivateModuleFragment
1305 ? TUFragmentKind::Private
1306 : TUFragmentKind::Normal);
1307
1308 CheckDelayedMemberExceptionSpecs();
1309 } else {
1310 // If we are building a TU prefix for serialization, it is safe to transfer
1311 // these over, even though they are not parsed. The end of the TU should be
1312 // outside of any eager template instantiation scope, so when this AST is
1313 // deserialized, these templates will not be parsed until the end of the
1314 // combined TU.
1315 PendingInstantiations.insert(position: PendingInstantiations.end(),
1316 first: LateParsedInstantiations.begin(),
1317 last: LateParsedInstantiations.end());
1318 LateParsedInstantiations.clear();
1319
1320 if (LangOpts.PCHInstantiateTemplates) {
1321 llvm::TimeTraceScope TimeScope("PerformPendingInstantiations");
1322 PerformPendingInstantiations();
1323 }
1324 }
1325
1326 DiagnoseUnterminatedPragmaAlignPack();
1327 DiagnoseUnterminatedPragmaAttribute();
1328 OpenMP().DiagnoseUnterminatedOpenMPDeclareTarget();
1329 DiagnosePrecisionLossInComplexDivision();
1330
1331 // All delayed member exception specs should be checked or we end up accepting
1332 // incompatible declarations.
1333 assert(DelayedOverridingExceptionSpecChecks.empty());
1334 assert(DelayedEquivalentExceptionSpecChecks.empty());
1335
1336 // All dllexport classes should have been processed already.
1337 assert(DelayedDllExportClasses.empty());
1338 assert(DelayedDllExportMemberFunctions.empty());
1339
1340 // Remove file scoped decls that turned out to be used.
1341 UnusedFileScopedDecls.erase(
1342 From: std::remove_if(first: UnusedFileScopedDecls.begin(source: nullptr, LocalOnly: true),
1343 last: UnusedFileScopedDecls.end(),
1344 pred: [this](const DeclaratorDecl *DD) {
1345 return ShouldRemoveFromUnused(SemaRef: this, D: DD);
1346 }),
1347 To: UnusedFileScopedDecls.end());
1348
1349 if (TUKind == TU_Prefix) {
1350 // Translation unit prefixes don't need any of the checking below.
1351 if (!PP.isIncrementalProcessingEnabled())
1352 TUScope = nullptr;
1353 return;
1354 }
1355
1356 // Check for #pragma weak identifiers that were never declared
1357 LoadExternalWeakUndeclaredIdentifiers();
1358 for (const auto &WeakIDs : WeakUndeclaredIdentifiers) {
1359 if (WeakIDs.second.empty())
1360 continue;
1361
1362 Decl *PrevDecl = LookupSingleName(S: TUScope, Name: WeakIDs.first, Loc: SourceLocation(),
1363 NameKind: LookupOrdinaryName);
1364 if (PrevDecl != nullptr &&
1365 !(isa<FunctionDecl>(Val: PrevDecl) || isa<VarDecl>(Val: PrevDecl)))
1366 for (const auto &WI : WeakIDs.second)
1367 Diag(Loc: WI.getLocation(), DiagID: diag::warn_attribute_wrong_decl_type)
1368 << "'weak'" << /*isRegularKeyword=*/0 << ExpectedVariableOrFunction;
1369 else
1370 for (const auto &WI : WeakIDs.second)
1371 Diag(Loc: WI.getLocation(), DiagID: diag::warn_weak_identifier_undeclared)
1372 << WeakIDs.first;
1373 }
1374
1375 if (LangOpts.CPlusPlus11 &&
1376 !Diags.isIgnored(DiagID: diag::warn_delegating_ctor_cycle, Loc: SourceLocation()))
1377 CheckDelegatingCtorCycles();
1378
1379 if (!Diags.hasErrorOccurred()) {
1380 if (ExternalSource)
1381 ExternalSource->ReadUndefinedButUsed(Undefined&: UndefinedButUsed);
1382 checkUndefinedButUsed(S&: *this);
1383 }
1384
1385 // A global-module-fragment is only permitted within a module unit.
1386 if (!ModuleScopes.empty() && ModuleScopes.back().Module->Kind ==
1387 Module::ExplicitGlobalModuleFragment) {
1388 Diag(Loc: ModuleScopes.back().BeginLoc,
1389 DiagID: diag::err_module_declaration_missing_after_global_module_introducer);
1390 } else if (getLangOpts().getCompilingModule() ==
1391 LangOptions::CMK_ModuleInterface &&
1392 // We can't use ModuleScopes here since ModuleScopes is always
1393 // empty if we're compiling the BMI.
1394 !getASTContext().getCurrentNamedModule()) {
1395 // If we are building a module interface unit, we should have seen the
1396 // module declaration.
1397 //
1398 // FIXME: Make a better guess as to where to put the module declaration.
1399 Diag(Loc: getSourceManager().getLocForStartOfFile(
1400 FID: getSourceManager().getMainFileID()),
1401 DiagID: diag::err_module_declaration_missing);
1402 }
1403
1404 // Now we can decide whether the modules we're building need an initializer.
1405 if (Module *CurrentModule = getCurrentModule();
1406 CurrentModule && CurrentModule->isInterfaceOrPartition()) {
1407 auto DoesModNeedInit = [this](Module *M) {
1408 if (!getASTContext().getModuleInitializers(M).empty())
1409 return true;
1410 for (auto [Exported, _] : M->Exports)
1411 if (Exported->isNamedModuleInterfaceHasInit())
1412 return true;
1413 for (Module *I : M->Imports)
1414 if (I->isNamedModuleInterfaceHasInit())
1415 return true;
1416
1417 return false;
1418 };
1419
1420 CurrentModule->NamedModuleHasInit =
1421 DoesModNeedInit(CurrentModule) ||
1422 llvm::any_of(Range: CurrentModule->submodules(), P: DoesModNeedInit);
1423 }
1424
1425 if (TUKind == TU_ClangModule) {
1426 // If we are building a module, resolve all of the exported declarations
1427 // now.
1428 if (Module *CurrentModule = PP.getCurrentModule()) {
1429 ModuleMap &ModMap = PP.getHeaderSearchInfo().getModuleMap();
1430
1431 SmallVector<Module *, 2> Stack;
1432 Stack.push_back(Elt: CurrentModule);
1433 while (!Stack.empty()) {
1434 Module *Mod = Stack.pop_back_val();
1435
1436 // Resolve the exported declarations and conflicts.
1437 // FIXME: Actually complain, once we figure out how to teach the
1438 // diagnostic client to deal with complaints in the module map at this
1439 // point.
1440 ModMap.resolveExports(Mod, /*Complain=*/false);
1441 ModMap.resolveUses(Mod, /*Complain=*/false);
1442 ModMap.resolveConflicts(Mod, /*Complain=*/false);
1443
1444 // Queue the submodules, so their exports will also be resolved.
1445 auto SubmodulesRange = Mod->submodules();
1446 Stack.append(in_start: SubmodulesRange.begin(), in_end: SubmodulesRange.end());
1447 }
1448 }
1449
1450 // Warnings emitted in ActOnEndOfTranslationUnit() should be emitted for
1451 // modules when they are built, not every time they are used.
1452 emitAndClearUnusedLocalTypedefWarnings();
1453 }
1454
1455 // C++ standard modules. Diagnose cases where a function is declared inline
1456 // in the module purview but has no definition before the end of the TU or
1457 // the start of a Private Module Fragment (if one is present).
1458 if (!PendingInlineFuncDecls.empty()) {
1459 for (auto *FD : PendingInlineFuncDecls) {
1460 bool DefInPMF = false;
1461 if (auto *FDD = FD->getDefinition()) {
1462 DefInPMF = FDD->getOwningModule()->isPrivateModule();
1463 if (!DefInPMF)
1464 continue;
1465 }
1466 Diag(Loc: FD->getLocation(), DiagID: diag::err_export_inline_not_defined) << DefInPMF;
1467 // If we have a PMF it should be at the end of the ModuleScopes.
1468 if (DefInPMF &&
1469 ModuleScopes.back().Module->Kind == Module::PrivateModuleFragment) {
1470 Diag(Loc: ModuleScopes.back().BeginLoc, DiagID: diag::note_private_module_fragment);
1471 }
1472 }
1473 PendingInlineFuncDecls.clear();
1474 }
1475
1476 // C99 6.9.2p2:
1477 // A declaration of an identifier for an object that has file
1478 // scope without an initializer, and without a storage-class
1479 // specifier or with the storage-class specifier static,
1480 // constitutes a tentative definition. If a translation unit
1481 // contains one or more tentative definitions for an identifier,
1482 // and the translation unit contains no external definition for
1483 // that identifier, then the behavior is exactly as if the
1484 // translation unit contains a file scope declaration of that
1485 // identifier, with the composite type as of the end of the
1486 // translation unit, with an initializer equal to 0.
1487 llvm::SmallPtrSet<VarDecl *, 32> Seen;
1488 for (TentativeDefinitionsType::iterator
1489 T = TentativeDefinitions.begin(source: ExternalSource.get()),
1490 TEnd = TentativeDefinitions.end();
1491 T != TEnd; ++T) {
1492 VarDecl *VD = (*T)->getActingDefinition();
1493
1494 // If the tentative definition was completed, getActingDefinition() returns
1495 // null. If we've already seen this variable before, insert()'s second
1496 // return value is false.
1497 if (!VD || VD->isInvalidDecl() || !Seen.insert(Ptr: VD).second)
1498 continue;
1499
1500 if (const IncompleteArrayType *ArrayT
1501 = Context.getAsIncompleteArrayType(T: VD->getType())) {
1502 // Set the length of the array to 1 (C99 6.9.2p5).
1503 Diag(Loc: VD->getLocation(), DiagID: diag::warn_tentative_incomplete_array);
1504 llvm::APInt One(Context.getTypeSize(T: Context.getSizeType()), true);
1505 QualType T = Context.getConstantArrayType(
1506 EltTy: ArrayT->getElementType(), ArySize: One, SizeExpr: nullptr, ASM: ArraySizeModifier::Normal, IndexTypeQuals: 0);
1507 VD->setType(T);
1508 } else if (RequireCompleteType(Loc: VD->getLocation(), T: VD->getType(),
1509 DiagID: diag::err_tentative_def_incomplete_type))
1510 VD->setInvalidDecl();
1511
1512 // No initialization is performed for a tentative definition.
1513 CheckCompleteVariableDeclaration(VD);
1514
1515 // In C, if the definition is const-qualified and has no initializer, it
1516 // is left uninitialized unless it has static or thread storage duration.
1517 QualType Type = VD->getType();
1518 if (!VD->isInvalidDecl() && !getLangOpts().CPlusPlus &&
1519 Type.isConstQualified() && !VD->getAnyInitializer()) {
1520 unsigned DiagID = diag::warn_default_init_const_unsafe;
1521 if (VD->getStorageDuration() == SD_Static ||
1522 VD->getStorageDuration() == SD_Thread)
1523 DiagID = diag::warn_default_init_const;
1524
1525 bool EmitCppCompat = !Diags.isIgnored(
1526 DiagID: diag::warn_cxx_compat_hack_fake_diagnostic_do_not_emit,
1527 Loc: VD->getLocation());
1528
1529 Diag(Loc: VD->getLocation(), DiagID) << Type << EmitCppCompat;
1530 }
1531
1532 // Notify the consumer that we've completed a tentative definition.
1533 if (!VD->isInvalidDecl())
1534 Consumer.CompleteTentativeDefinition(D: VD);
1535 }
1536
1537 // In incremental mode, tentative definitions belong to the current
1538 // partial translation unit (PTU). Once they have been completed and
1539 // emitted to codegen, drop them to prevent re-emission in future PTUs.
1540 if (PP.isIncrementalProcessingEnabled())
1541 TentativeDefinitions.erase(From: TentativeDefinitions.begin(source: ExternalSource.get()),
1542 To: TentativeDefinitions.end());
1543
1544 for (auto *D : ExternalDeclarations) {
1545 if (!D || D->isInvalidDecl() || D->getPreviousDecl() || !D->isUsed())
1546 continue;
1547
1548 Consumer.CompleteExternalDeclaration(D);
1549 }
1550
1551 // Visit all pending #pragma export.
1552 for (const PendingPragmaInfo &Exported : PendingExportedNames.values()) {
1553 if (!Exported.Used)
1554 Diag(Loc: Exported.NameLoc, DiagID: diag::warn_failed_to_resolve_pragma) << "export";
1555 }
1556
1557 if (LangOpts.HLSL)
1558 HLSL().ActOnEndOfTranslationUnit(TU: getASTContext().getTranslationUnitDecl());
1559 if (LangOpts.OpenACC)
1560 OpenACC().ActOnEndOfTranslationUnit(
1561 TU: getASTContext().getTranslationUnitDecl());
1562
1563 // If there were errors, disable 'unused' warnings since they will mostly be
1564 // noise. Don't warn for a use from a module: either we should warn on all
1565 // file-scope declarations in modules or not at all, but whether the
1566 // declaration is used is immaterial.
1567 if (!Diags.hasErrorOccurred() && TUKind != TU_ClangModule) {
1568 // Output warning for unused file scoped decls.
1569 for (UnusedFileScopedDeclsType::iterator
1570 I = UnusedFileScopedDecls.begin(source: ExternalSource.get()),
1571 E = UnusedFileScopedDecls.end();
1572 I != E; ++I) {
1573 if (ShouldRemoveFromUnused(SemaRef: this, D: *I))
1574 continue;
1575
1576 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Val: *I)) {
1577 const FunctionDecl *DiagD;
1578 if (!FD->hasBody(Definition&: DiagD))
1579 DiagD = FD;
1580 if (DiagD->isDeleted())
1581 continue; // Deleted functions are supposed to be unused.
1582 SourceRange DiagRange = DiagD->getLocation();
1583 if (const ASTTemplateArgumentListInfo *ASTTAL =
1584 DiagD->getTemplateSpecializationArgsAsWritten())
1585 DiagRange.setEnd(ASTTAL->RAngleLoc);
1586 if (DiagD->isReferenced()) {
1587 if (isa<CXXMethodDecl>(Val: DiagD))
1588 Diag(Loc: DiagD->getLocation(), DiagID: diag::warn_unneeded_member_function)
1589 << DiagD << DiagRange;
1590 else {
1591 if (FD->getStorageClass() == SC_Static &&
1592 !FD->isInlineSpecified() &&
1593 !SourceMgr.isInMainFile(
1594 Loc: SourceMgr.getExpansionLoc(Loc: FD->getLocation())))
1595 Diag(Loc: DiagD->getLocation(),
1596 DiagID: diag::warn_unneeded_static_internal_decl)
1597 << DiagD << DiagRange;
1598 else
1599 Diag(Loc: DiagD->getLocation(), DiagID: diag::warn_unneeded_internal_decl)
1600 << /*function=*/0 << DiagD << DiagRange;
1601 }
1602 } else if (!FD->isTargetMultiVersion() ||
1603 FD->isTargetMultiVersionDefault()) {
1604 if (FD->getDescribedFunctionTemplate())
1605 Diag(Loc: DiagD->getLocation(), DiagID: diag::warn_unused_template)
1606 << /*function=*/0 << DiagD << DiagRange;
1607 else
1608 Diag(Loc: DiagD->getLocation(), DiagID: isa<CXXMethodDecl>(Val: DiagD)
1609 ? diag::warn_unused_member_function
1610 : diag::warn_unused_function)
1611 << DiagD << DiagRange;
1612 }
1613 } else {
1614 const VarDecl *DiagD = cast<VarDecl>(Val: *I)->getDefinition();
1615 if (!DiagD)
1616 DiagD = cast<VarDecl>(Val: *I);
1617 SourceRange DiagRange = DiagD->getLocation();
1618 if (const auto *VTSD = dyn_cast<VarTemplateSpecializationDecl>(Val: DiagD)) {
1619 if (const ASTTemplateArgumentListInfo *ASTTAL =
1620 VTSD->getTemplateArgsAsWritten())
1621 DiagRange.setEnd(ASTTAL->RAngleLoc);
1622 }
1623 if (DiagD->isReferenced()) {
1624 Diag(Loc: DiagD->getLocation(), DiagID: diag::warn_unneeded_internal_decl)
1625 << /*variable=*/1 << DiagD << DiagRange;
1626 } else if (DiagD->getDescribedVarTemplate()) {
1627 Diag(Loc: DiagD->getLocation(), DiagID: diag::warn_unused_template)
1628 << /*variable=*/1 << DiagD << DiagRange;
1629 } else if (DiagD->getType().isConstQualified()) {
1630 const SourceManager &SM = SourceMgr;
1631 if (SM.getMainFileID() != SM.getFileID(SpellingLoc: DiagD->getLocation()) ||
1632 !PP.getLangOpts().IsHeaderFile)
1633 Diag(Loc: DiagD->getLocation(), DiagID: diag::warn_unused_const_variable)
1634 << DiagD << DiagRange;
1635 } else {
1636 Diag(Loc: DiagD->getLocation(), DiagID: diag::warn_unused_variable)
1637 << DiagD << DiagRange;
1638 }
1639 }
1640 }
1641
1642 emitAndClearUnusedLocalTypedefWarnings();
1643 }
1644
1645 if (!Diags.isIgnored(DiagID: diag::warn_unused_but_set_global, Loc: SourceLocation())) {
1646 // Diagnose unused-but-set static globals in a deterministic order.
1647 // Not tracking shadowing info for static globals; there's nothing to
1648 // shadow.
1649 struct LocAndDiag {
1650 SourceLocation Loc;
1651 PartialDiagnostic PD;
1652 };
1653 SmallVector<LocAndDiag, 16> DeclDiags;
1654 auto addDiag = [&DeclDiags](SourceLocation Loc, PartialDiagnostic PD) {
1655 DeclDiags.push_back(Elt: LocAndDiag{.Loc: Loc, .PD: std::move(PD)});
1656 };
1657
1658 // For -Wunused-but-set-variable we only care about variables that were
1659 // referenced by the TU end.
1660 for (const auto &Ref : RefsMinusAssignments) {
1661 const VarDecl *VD = Ref.first;
1662 // Only diagnose internal linkage file vars defined in the main file to
1663 // match -Wunused-variable behavior and avoid false positives from
1664 // headers.
1665 if (VD->isInternalLinkageFileVar() && isMainFileLoc(Loc: VD->getLocation()))
1666 DiagnoseUnusedButSetDecl(VD, DiagReceiver: addDiag);
1667 }
1668
1669 llvm::sort(C&: DeclDiags,
1670 Comp: [](const LocAndDiag &LHS, const LocAndDiag &RHS) -> bool {
1671 // Sorting purely for determinism; matches behavior in
1672 // Sema::ActOnPopScope.
1673 return LHS.Loc < RHS.Loc;
1674 });
1675 for (const LocAndDiag &D : DeclDiags)
1676 Diag(Loc: D.Loc, PD: D.PD);
1677 }
1678
1679 if (!Diags.isIgnored(DiagID: diag::warn_unused_private_field, Loc: SourceLocation())) {
1680 // FIXME: Load additional unused private field candidates from the external
1681 // source.
1682 RecordCompleteMap RecordsComplete;
1683 RecordCompleteMap MNCComplete;
1684 for (const NamedDecl *D : UnusedPrivateFields) {
1685 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Val: D->getDeclContext());
1686 if (RD && !RD->isUnion() && !D->hasAttr<UnusedAttr>() &&
1687 IsRecordFullyDefined(RD, RecordsComplete, MNCComplete)) {
1688 Diag(Loc: D->getLocation(), DiagID: diag::warn_unused_private_field)
1689 << D->getDeclName();
1690 }
1691 }
1692 }
1693
1694 if (!Diags.isIgnored(DiagID: diag::warn_mismatched_delete_new, Loc: SourceLocation())) {
1695 if (ExternalSource)
1696 ExternalSource->ReadMismatchingDeleteExpressions(DeleteExprs);
1697 for (const auto &DeletedFieldInfo : DeleteExprs) {
1698 for (const auto &DeleteExprLoc : DeletedFieldInfo.second) {
1699 AnalyzeDeleteExprMismatch(Field: DeletedFieldInfo.first, DeleteLoc: DeleteExprLoc.first,
1700 DeleteWasArrayForm: DeleteExprLoc.second);
1701 }
1702 }
1703 }
1704
1705 AnalysisWarnings.IssueWarnings(D: Context.getTranslationUnitDecl());
1706
1707 if (Context.hasAnyFunctionEffects())
1708 performFunctionEffectAnalysis(TU: Context.getTranslationUnitDecl());
1709
1710 // Check we've noticed that we're no longer parsing the initializer for every
1711 // variable. If we miss cases, then at best we have a performance issue and
1712 // at worst a rejects-valid bug.
1713 assert(ParsingInitForAutoVars.empty() &&
1714 "Didn't unmark var as having its initializer parsed");
1715
1716 if (!PP.isIncrementalProcessingEnabled())
1717 TUScope = nullptr;
1718
1719 checkExposure(TU: Context.getTranslationUnitDecl());
1720}
1721
1722
1723//===----------------------------------------------------------------------===//
1724// Helper functions.
1725//===----------------------------------------------------------------------===//
1726
1727DeclContext *Sema::getFunctionLevelDeclContext(bool AllowLambda) const {
1728 DeclContext *DC = CurContext;
1729
1730 while (true) {
1731 if (isa<BlockDecl, EnumDecl, CapturedDecl, RequiresExprBodyDecl,
1732 CXXExpansionStmtDecl>(Val: DC)) {
1733 DC = DC->getParent();
1734 } else if (!AllowLambda && isa<CXXMethodDecl>(Val: DC) &&
1735 cast<CXXMethodDecl>(Val: DC)->getOverloadedOperator() == OO_Call &&
1736 cast<CXXRecordDecl>(Val: DC->getParent())->isLambda()) {
1737 DC = DC->getParent()->getParent();
1738 } else
1739 break;
1740 }
1741
1742 return DC;
1743}
1744
1745/// getCurFunctionDecl - If inside of a function body, this returns a pointer
1746/// to the function decl for the function being parsed. If we're currently
1747/// in a 'block', this returns the containing context.
1748FunctionDecl *Sema::getCurFunctionDecl(bool AllowLambda) const {
1749 DeclContext *DC = getFunctionLevelDeclContext(AllowLambda);
1750 return dyn_cast<FunctionDecl>(Val: DC);
1751}
1752
1753ObjCMethodDecl *Sema::getCurMethodDecl() {
1754 DeclContext *DC = getFunctionLevelDeclContext();
1755 while (isa<RecordDecl>(Val: DC))
1756 DC = DC->getParent();
1757 return dyn_cast<ObjCMethodDecl>(Val: DC);
1758}
1759
1760NamedDecl *Sema::getCurFunctionOrMethodDecl() const {
1761 DeclContext *DC = getFunctionLevelDeclContext();
1762 if (isa<ObjCMethodDecl>(Val: DC) || isa<FunctionDecl>(Val: DC))
1763 return cast<NamedDecl>(Val: DC);
1764 return nullptr;
1765}
1766
1767LangAS Sema::getDefaultCXXMethodAddrSpace() const {
1768 if (getLangOpts().OpenCL)
1769 return getASTContext().getDefaultOpenCLPointeeAddrSpace();
1770 return LangAS::Default;
1771}
1772
1773void Sema::EmitDiagnostic(unsigned DiagID, const DiagnosticBuilder &DB) {
1774 // FIXME: It doesn't make sense to me that DiagID is an incoming argument here
1775 // and yet we also use the current diag ID on the DiagnosticsEngine. This has
1776 // been made more painfully obvious by the refactor that introduced this
1777 // function, but it is possible that the incoming argument can be
1778 // eliminated. If it truly cannot be (for example, there is some reentrancy
1779 // issue I am not seeing yet), then there should at least be a clarifying
1780 // comment somewhere.
1781 Diagnostic DiagInfo(&Diags, DB);
1782 if (SFINAETrap *Trap = getSFINAEContext()) {
1783 sema::TemplateDeductionInfo *Info = Trap->getDeductionInfo();
1784 switch (DiagnosticIDs::getDiagnosticSFINAEResponse(DiagID: DiagInfo.getID())) {
1785 case DiagnosticIDs::SFINAE_Report:
1786 // We'll report the diagnostic below.
1787 break;
1788
1789 case DiagnosticIDs::SFINAE_SubstitutionFailure:
1790 // Count this failure so that we know that template argument deduction
1791 // has failed.
1792 Trap->setErrorOccurred();
1793
1794 // Make a copy of this suppressed diagnostic and store it with the
1795 // template-deduction information.
1796 if (Info && !Info->hasSFINAEDiagnostic())
1797 Info->addSFINAEDiagnostic(
1798 Loc: DiagInfo.getLocation(),
1799 PD: PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
1800
1801 Diags.setLastDiagnosticIgnored(true);
1802 return;
1803
1804 case DiagnosticIDs::SFINAE_AccessControl: {
1805 // Per C++ Core Issue 1170, access control is part of SFINAE.
1806 // Additionally, the WithAccessChecking flag can be used to temporarily
1807 // make access control a part of SFINAE for the purposes of checking
1808 // type traits.
1809 if (!Trap->withAccessChecking() && !getLangOpts().CPlusPlus11)
1810 break;
1811
1812 SourceLocation Loc = DiagInfo.getLocation();
1813
1814 // Suppress this diagnostic.
1815 Trap->setErrorOccurred();
1816
1817 // Make a copy of this suppressed diagnostic and store it with the
1818 // template-deduction information.
1819 if (Info && !Info->hasSFINAEDiagnostic())
1820 Info->addSFINAEDiagnostic(
1821 Loc: DiagInfo.getLocation(),
1822 PD: PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
1823
1824 Diags.setLastDiagnosticIgnored(true);
1825
1826 // Now produce a C++98 compatibility warning.
1827 Diag(Loc, DiagID: diag::warn_cxx98_compat_sfinae_access_control);
1828
1829 // The last diagnostic which Sema produced was ignored. Suppress any
1830 // notes attached to it.
1831 Diags.setLastDiagnosticIgnored(true);
1832 return;
1833 }
1834
1835 case DiagnosticIDs::SFINAE_Suppress:
1836 if (DiagnosticsEngine::Level Level = getDiagnostics().getDiagnosticLevel(
1837 DiagID: DiagInfo.getID(), Loc: DiagInfo.getLocation());
1838 Level == DiagnosticsEngine::Ignored)
1839 return;
1840 // Make a copy of this suppressed diagnostic and store it with the
1841 // template-deduction information;
1842 if (Info) {
1843 Info->addSuppressedDiagnostic(
1844 Loc: DiagInfo.getLocation(),
1845 PD: PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
1846 if (!Diags.getDiagnosticIDs()->isNote(DiagID))
1847 PrintContextStack(DiagFunc: [Info](SourceLocation Loc, PartialDiagnostic PD) {
1848 Info->addSuppressedDiagnostic(Loc, PD: std::move(PD));
1849 });
1850 }
1851
1852 // Suppress this diagnostic.
1853 Diags.setLastDiagnosticIgnored(true);
1854 return;
1855 }
1856 }
1857
1858 // Copy the diagnostic printing policy over the ASTContext printing policy.
1859 // TODO: Stop doing that. See: https://reviews.llvm.org/D45093#1090292
1860 Context.setPrintingPolicy(getPrintingPolicy());
1861
1862 // Emit the diagnostic.
1863 if (!Diags.EmitDiagnostic(DB))
1864 return;
1865
1866 // If this is not a note, and we're in a template instantiation
1867 // that is different from the last template instantiation where
1868 // we emitted an error, print a template instantiation
1869 // backtrace.
1870 if (!Diags.getDiagnosticIDs()->isNote(DiagID))
1871 PrintContextStack();
1872}
1873
1874bool Sema::hasUncompilableErrorOccurred() const {
1875 if (getDiagnostics().hasUncompilableErrorOccurred())
1876 return true;
1877 auto *FD = dyn_cast<FunctionDecl>(Val: CurContext);
1878 if (!FD)
1879 return false;
1880 auto Loc = DeviceDeferredDiags.find(Val: FD);
1881 if (Loc == DeviceDeferredDiags.end())
1882 return false;
1883 for (auto PDAt : Loc->second) {
1884 if (Diags.getDiagnosticIDs()->isDefaultMappingAsError(
1885 DiagID: PDAt.second.getDiagID()))
1886 return true;
1887 }
1888 return false;
1889}
1890
1891// Print notes showing how we can reach FD starting from an a priori
1892// known-callable function. When a function has multiple callers, emit
1893// each call chain separately. The first note in each chain uses
1894// "called by" and subsequent notes use "which is called by".
1895static void emitCallStackNotes(Sema &S, const FunctionDecl *FD) {
1896 auto FnIt = S.CUDA().DeviceKnownEmittedFns.find(Val: FD);
1897 if (FnIt == S.CUDA().DeviceKnownEmittedFns.end())
1898 return;
1899
1900 for (const auto &CallerInfo : FnIt->second) {
1901 if (S.Diags.hasFatalErrorOccurred())
1902 return;
1903 S.Diags.Report(Loc: CallerInfo.Loc, DiagID: diag::note_called_by) << CallerInfo.FD;
1904 // Walk up the rest of the chain using "which is called by".
1905 auto NextIt = S.CUDA().DeviceKnownEmittedFns.find(Val: CallerInfo.FD);
1906 while (NextIt != S.CUDA().DeviceKnownEmittedFns.end()) {
1907 if (S.Diags.hasFatalErrorOccurred())
1908 return;
1909 const auto &Next = NextIt->second.front();
1910 S.Diags.Report(Loc: Next.Loc, DiagID: diag::note_which_is_called_by) << Next.FD;
1911 NextIt = S.CUDA().DeviceKnownEmittedFns.find(Val: Next.FD);
1912 }
1913 }
1914}
1915
1916namespace {
1917
1918/// Helper class that emits deferred diagnostic messages if an entity directly
1919/// or indirectly using the function that causes the deferred diagnostic
1920/// messages is known to be emitted.
1921///
1922/// During parsing of AST, certain diagnostic messages are recorded as deferred
1923/// diagnostics since it is unknown whether the functions containing such
1924/// diagnostics will be emitted. A list of potentially emitted functions and
1925/// variables that may potentially trigger emission of functions are also
1926/// recorded. DeferredDiagnosticsEmitter recursively visits used functions
1927/// by each function to emit deferred diagnostics.
1928///
1929/// During the visit, certain OpenMP directives or initializer of variables
1930/// with certain OpenMP attributes will cause subsequent visiting of any
1931/// functions enter a state which is called OpenMP device context in this
1932/// implementation. The state is exited when the directive or initializer is
1933/// exited. This state can change the emission states of subsequent uses
1934/// of functions.
1935///
1936/// Conceptually the functions or variables to be visited form a use graph
1937/// where the parent node uses the child node. At any point of the visit,
1938/// the tree nodes traversed from the tree root to the current node form a use
1939/// stack. The emission state of the current node depends on two factors:
1940/// 1. the emission state of the root node
1941/// 2. whether the current node is in OpenMP device context
1942/// If the function is decided to be emitted, its contained deferred diagnostics
1943/// are emitted, together with the information about the use stack.
1944///
1945class DeferredDiagnosticsEmitter
1946 : public UsedDeclVisitor<DeferredDiagnosticsEmitter> {
1947public:
1948 typedef UsedDeclVisitor<DeferredDiagnosticsEmitter> Inherited;
1949
1950 // Whether the function is already in the current use-path.
1951 llvm::SmallPtrSet<CanonicalDeclPtr<Decl>, 4> InUsePath;
1952
1953 // The current use-path.
1954 llvm::SmallVector<CanonicalDeclPtr<FunctionDecl>, 4> UsePath;
1955
1956 // Whether the visiting of the function has been done. Done[0] is for the
1957 // case not in OpenMP device context. Done[1] is for the case in OpenMP
1958 // device context. We need two sets because diagnostics emission may be
1959 // different depending on whether it is in OpenMP device context.
1960 llvm::SmallPtrSet<CanonicalDeclPtr<Decl>, 4> DoneMap[2];
1961
1962 // Functions that need their deferred diagnostics emitted. Collected
1963 // during the graph walk and emitted afterwards so that all callers
1964 // are known when producing call chain notes.
1965 llvm::SetVector<CanonicalDeclPtr<const FunctionDecl>> FnsToEmit;
1966
1967 // Emission state of the root node of the current use graph.
1968 bool ShouldEmitRootNode;
1969
1970 // Current OpenMP device context level. It is initialized to 0 and each
1971 // entering of device context increases it by 1 and each exit decreases
1972 // it by 1. Non-zero value indicates it is currently in device context.
1973 unsigned InOMPDeviceContext;
1974
1975 DeferredDiagnosticsEmitter(Sema &S)
1976 : Inherited(S), ShouldEmitRootNode(false), InOMPDeviceContext(0) {}
1977
1978 bool shouldVisitDiscardedStmt() const { return false; }
1979
1980 void VisitOMPTargetDirective(OMPTargetDirective *Node) {
1981 ++InOMPDeviceContext;
1982 Inherited::VisitOMPTargetDirective(S: Node);
1983 --InOMPDeviceContext;
1984 }
1985
1986 void visitUsedDecl(SourceLocation Loc, Decl *D) {
1987 if (isa<VarDecl>(Val: D))
1988 return;
1989 if (auto *FD = dyn_cast<FunctionDecl>(Val: D))
1990 checkFunc(Loc, FD);
1991 else
1992 Inherited::visitUsedDecl(Loc, D);
1993 }
1994
1995 // Visitor member and parent dtors called by this dtor.
1996 void VisitCalledDestructors(CXXDestructorDecl *DD) {
1997 const CXXRecordDecl *RD = DD->getParent();
1998
1999 // Visit the dtors of all members
2000 for (const FieldDecl *FD : RD->fields()) {
2001 QualType FT = FD->getType();
2002 if (const auto *ClassDecl = FT->getAsCXXRecordDecl();
2003 ClassDecl &&
2004 (ClassDecl->isBeingDefined() || ClassDecl->isCompleteDefinition()))
2005 if (CXXDestructorDecl *MemberDtor = ClassDecl->getDestructor())
2006 asImpl().visitUsedDecl(Loc: MemberDtor->getLocation(), D: MemberDtor);
2007 }
2008
2009 // Also visit base class dtors
2010 for (const auto &Base : RD->bases()) {
2011 QualType BaseType = Base.getType();
2012 if (const auto *BaseDecl = BaseType->getAsCXXRecordDecl();
2013 BaseDecl &&
2014 (BaseDecl->isBeingDefined() || BaseDecl->isCompleteDefinition()))
2015 if (CXXDestructorDecl *BaseDtor = BaseDecl->getDestructor())
2016 asImpl().visitUsedDecl(Loc: BaseDtor->getLocation(), D: BaseDtor);
2017 }
2018 }
2019
2020 void VisitDeclStmt(DeclStmt *DS) {
2021 // Visit dtors called by variables that need destruction
2022 for (auto *D : DS->decls())
2023 if (auto *VD = dyn_cast<VarDecl>(Val: D))
2024 if (VD->isThisDeclarationADefinition() &&
2025 VD->needsDestruction(Ctx: S.Context)) {
2026 QualType VT = VD->getType();
2027 if (const auto *ClassDecl = VT->getAsCXXRecordDecl();
2028 ClassDecl && (ClassDecl->isBeingDefined() ||
2029 ClassDecl->isCompleteDefinition()))
2030 if (CXXDestructorDecl *Dtor = ClassDecl->getDestructor())
2031 asImpl().visitUsedDecl(Loc: Dtor->getLocation(), D: Dtor);
2032 }
2033
2034 Inherited::VisitDeclStmt(S: DS);
2035 }
2036 void checkVar(VarDecl *VD) {
2037 assert(VD->isFileVarDecl() &&
2038 "Should only check file-scope variables");
2039 if (auto *Init = VD->getInit()) {
2040 auto DevTy = OMPDeclareTargetDeclAttr::getDeviceType(VD);
2041 bool IsDev = DevTy && (*DevTy == OMPDeclareTargetDeclAttr::DT_NoHost ||
2042 *DevTy == OMPDeclareTargetDeclAttr::DT_Any);
2043 if (IsDev)
2044 ++InOMPDeviceContext;
2045 this->Visit(S: Init);
2046 if (IsDev)
2047 --InOMPDeviceContext;
2048 }
2049 }
2050
2051 void checkFunc(SourceLocation Loc, FunctionDecl *FD) {
2052 auto &Done = DoneMap[InOMPDeviceContext > 0 ? 1 : 0];
2053 FunctionDecl *Caller = UsePath.empty() ? nullptr : UsePath.back();
2054 if ((!ShouldEmitRootNode && !S.getLangOpts().OpenMP && !Caller) ||
2055 S.shouldIgnoreInHostDeviceCheck(Callee: FD) || InUsePath.count(Ptr: FD))
2056 return;
2057 // Finalize analysis of OpenMP-specific constructs.
2058 if (Caller && S.LangOpts.OpenMP && UsePath.size() == 1 &&
2059 (ShouldEmitRootNode || InOMPDeviceContext))
2060 S.OpenMP().finalizeOpenMPDelayedAnalysis(Caller, Callee: FD, Loc);
2061 if (Caller) {
2062 auto &Callers = S.CUDA().DeviceKnownEmittedFns[FD];
2063 CanonicalDeclPtr<const FunctionDecl> CanonCaller(Caller);
2064 if (llvm::none_of(Range&: Callers, P: [CanonCaller](const auto &C) {
2065 return C.FD == CanonCaller;
2066 }))
2067 Callers.push_back(Elt: {.FD: Caller, .Loc: Loc});
2068 }
2069 if (ShouldEmitRootNode || InOMPDeviceContext)
2070 FnsToEmit.insert(X: FD);
2071 // Do not revisit a function if the function body has been completely
2072 // visited before.
2073 if (!Done.insert(Ptr: FD).second)
2074 return;
2075 InUsePath.insert(Ptr: FD);
2076 UsePath.push_back(Elt: FD);
2077 if (auto *S = FD->getBody()) {
2078 this->Visit(S);
2079 }
2080 if (CXXDestructorDecl *Dtor = dyn_cast<CXXDestructorDecl>(Val: FD))
2081 asImpl().VisitCalledDestructors(DD: Dtor);
2082 UsePath.pop_back();
2083 InUsePath.erase(Ptr: FD);
2084 }
2085
2086 void checkRecordedDecl(Decl *D) {
2087 if (auto *FD = dyn_cast<FunctionDecl>(Val: D)) {
2088 ShouldEmitRootNode = S.getEmissionStatus(Decl: FD, /*Final=*/true) ==
2089 Sema::FunctionEmissionStatus::Emitted;
2090 checkFunc(Loc: SourceLocation(), FD);
2091 } else
2092 checkVar(VD: cast<VarDecl>(Val: D));
2093 }
2094
2095 void emitDeferredDiags(const FunctionDecl *FD) {
2096 auto It = S.DeviceDeferredDiags.find(Val: FD);
2097 if (It == S.DeviceDeferredDiags.end())
2098 return;
2099 bool HasWarningOrError = false;
2100 for (PartialDiagnosticAt &PDAt : It->second) {
2101 if (S.Diags.hasFatalErrorOccurred())
2102 return;
2103 const SourceLocation &Loc = PDAt.first;
2104 const PartialDiagnostic &PD = PDAt.second;
2105 HasWarningOrError |=
2106 S.getDiagnostics().getDiagnosticLevel(DiagID: PD.getDiagID(), Loc) >=
2107 DiagnosticsEngine::Warning;
2108 {
2109 DiagnosticBuilder Builder(S.Diags.Report(Loc, DiagID: PD.getDiagID()));
2110 PD.Emit(DB: Builder);
2111 }
2112 }
2113 if (HasWarningOrError)
2114 emitCallStackNotes(S, FD);
2115 }
2116
2117 void emitCollectedDiags() {
2118 for (const auto &FD : FnsToEmit)
2119 emitDeferredDiags(FD);
2120 }
2121};
2122} // namespace
2123
2124void Sema::emitDeferredDiags() {
2125 if (ExternalSource)
2126 ExternalSource->ReadDeclsToCheckForDeferredDiags(
2127 Decls&: DeclsToCheckForDeferredDiags);
2128
2129 // For each implicit-H+D-explicit-inst function with deferred errors but no
2130 // organic device caller, drop the diagnostics and mark for a trap body.
2131 auto ClassifyImplicitHDExplicitInst = [&]() {
2132 if (!LangOpts.CUDAIsDevice)
2133 return;
2134 for (auto &Pair : DeviceDeferredDiags) {
2135 const FunctionDecl *FD = Pair.first;
2136 if (!SemaCUDA::isImplicitHDExplicitInstantiation(FD))
2137 continue;
2138 if (CUDA().DeviceKnownEmittedFns.count(Val: FD))
2139 continue;
2140 bool HasError =
2141 llvm::any_of(Range&: Pair.second, P: [&](const PartialDiagnosticAt &PDAt) {
2142 return getDiagnostics().getDiagnosticLevel(DiagID: PDAt.second.getDiagID(),
2143 Loc: PDAt.first) >=
2144 DiagnosticsEngine::Error;
2145 });
2146 if (!HasError)
2147 continue;
2148 Pair.second.clear();
2149 Context.CUDADeviceInvalidFuncs.insert(Ptr: FD->getCanonicalDecl());
2150 }
2151 };
2152
2153 if ((DeviceDeferredDiags.empty() && !LangOpts.OpenMP) ||
2154 DeclsToCheckForDeferredDiags.empty()) {
2155 ClassifyImplicitHDExplicitInst();
2156 return;
2157 }
2158
2159 DeferredDiagnosticsEmitter DDE(*this);
2160 for (auto *D : DeclsToCheckForDeferredDiags)
2161 DDE.checkRecordedDecl(D);
2162 ClassifyImplicitHDExplicitInst();
2163 DDE.emitCollectedDiags();
2164}
2165
2166// In CUDA, there are some constructs which may appear in semantically-valid
2167// code, but trigger errors if we ever generate code for the function in which
2168// they appear. Essentially every construct you're not allowed to use on the
2169// device falls into this category, because you are allowed to use these
2170// constructs in a __host__ __device__ function, but only if that function is
2171// never codegen'ed on the device.
2172//
2173// To handle semantic checking for these constructs, we keep track of the set of
2174// functions we know will be emitted, either because we could tell a priori that
2175// they would be emitted, or because they were transitively called by a
2176// known-emitted function.
2177//
2178// We also keep a partial call graph of which not-known-emitted functions call
2179// which other not-known-emitted functions.
2180//
2181// When we see something which is illegal if the current function is emitted
2182// (usually by way of DiagIfDeviceCode, DiagIfHostCode, or
2183// CheckCall), we first check if the current function is known-emitted. If
2184// so, we immediately output the diagnostic.
2185//
2186// Otherwise, we "defer" the diagnostic. It sits in Sema::DeviceDeferredDiags
2187// until we discover that the function is known-emitted, at which point we take
2188// it out of this map and emit the diagnostic.
2189
2190Sema::SemaDiagnosticBuilder::SemaDiagnosticBuilder(Kind K, SourceLocation Loc,
2191 unsigned DiagID,
2192 const FunctionDecl *Fn,
2193 Sema &S)
2194 : S(S), Loc(Loc), DiagID(DiagID), Fn(Fn),
2195 ShowCallStack(K == K_ImmediateWithCallStack || K == K_Deferred) {
2196 switch (K) {
2197 case K_Nop:
2198 break;
2199 case K_Immediate:
2200 case K_ImmediateWithCallStack:
2201 ImmediateDiag.emplace(
2202 args: ImmediateDiagBuilder(S.Diags.Report(Loc, DiagID), S, DiagID));
2203 break;
2204 case K_Deferred:
2205 assert(Fn && "Must have a function to attach the deferred diag to.");
2206 auto &Diags = S.DeviceDeferredDiags[Fn];
2207 PartialDiagId.emplace(args: Diags.size());
2208 Diags.emplace_back(args&: Loc, args: S.PDiag(DiagID));
2209 break;
2210 }
2211}
2212
2213Sema::SemaDiagnosticBuilder::SemaDiagnosticBuilder(SemaDiagnosticBuilder &&D)
2214 : S(D.S), Loc(D.Loc), DiagID(D.DiagID), Fn(D.Fn),
2215 ShowCallStack(D.ShowCallStack), ImmediateDiag(D.ImmediateDiag),
2216 PartialDiagId(D.PartialDiagId) {
2217 // Clean the previous diagnostics.
2218 D.ShowCallStack = false;
2219 D.ImmediateDiag.reset();
2220 D.PartialDiagId.reset();
2221}
2222
2223Sema::SemaDiagnosticBuilder::~SemaDiagnosticBuilder() {
2224 if (ImmediateDiag) {
2225 // Emit our diagnostic and, if it was a warning or error, output a callstack
2226 // if Fn isn't a priori known-emitted.
2227 ImmediateDiag.reset(); // Emit the immediate diag.
2228
2229 if (ShowCallStack) {
2230 bool IsWarningOrError = S.getDiagnostics().getDiagnosticLevel(
2231 DiagID, Loc) >= DiagnosticsEngine::Warning;
2232 if (IsWarningOrError)
2233 emitCallStackNotes(S, FD: Fn);
2234 }
2235 } else {
2236 assert((!PartialDiagId || ShowCallStack) &&
2237 "Must always show call stack for deferred diags.");
2238 }
2239}
2240
2241Sema::SemaDiagnosticBuilder
2242Sema::targetDiag(SourceLocation Loc, unsigned DiagID, const FunctionDecl *FD) {
2243 FD = FD ? FD : getCurFunctionDecl();
2244 if (LangOpts.OpenMP)
2245 return LangOpts.OpenMPIsTargetDevice
2246 ? OpenMP().diagIfOpenMPDeviceCode(Loc, DiagID, FD)
2247 : OpenMP().diagIfOpenMPHostCode(Loc, DiagID, FD);
2248 if (getLangOpts().CUDA)
2249 return getLangOpts().CUDAIsDevice ? CUDA().DiagIfDeviceCode(Loc, DiagID)
2250 : CUDA().DiagIfHostCode(Loc, DiagID);
2251
2252 if (getLangOpts().SYCLIsDevice)
2253 return SYCL().DiagIfDeviceCode(Loc, DiagID);
2254
2255 return SemaDiagnosticBuilder(SemaDiagnosticBuilder::K_Immediate, Loc, DiagID,
2256 FD, *this);
2257}
2258
2259void Sema::checkTypeSupport(QualType Ty, SourceLocation Loc, ValueDecl *D) {
2260 if (isUnevaluatedContext() || Ty.isNull())
2261 return;
2262
2263 // The original idea behind checkTypeSupport function is that unused
2264 // declarations can be replaced with an array of bytes of the same size during
2265 // codegen, such replacement doesn't seem to be possible for types without
2266 // constant byte size like zero length arrays. So, do a deep check for SYCL.
2267 if (D && LangOpts.SYCLIsDevice) {
2268 llvm::DenseSet<QualType> Visited;
2269 SYCL().deepTypeCheckForDevice(UsedAt: Loc, Visited, DeclToCheck: D);
2270 }
2271
2272 Decl *C = cast<Decl>(Val: getCurLexicalContext());
2273
2274 // Memcpy operations for structs containing a member with unsupported type
2275 // are ok, though.
2276 if (const auto *MD = dyn_cast<CXXMethodDecl>(Val: C)) {
2277 if ((MD->isCopyAssignmentOperator() || MD->isMoveAssignmentOperator()) &&
2278 MD->isTrivial())
2279 return;
2280
2281 if (const auto *Ctor = dyn_cast<CXXConstructorDecl>(Val: MD))
2282 if (Ctor->isCopyOrMoveConstructor() && Ctor->isTrivial())
2283 return;
2284 }
2285
2286 // Try to associate errors with the lexical context, if that is a function, or
2287 // the value declaration otherwise.
2288 const FunctionDecl *FD = isa<FunctionDecl>(Val: C)
2289 ? cast<FunctionDecl>(Val: C)
2290 : dyn_cast_or_null<FunctionDecl>(Val: D);
2291
2292 auto CheckDeviceType = [&](QualType Ty) {
2293 if (Ty->isDependentType())
2294 return;
2295
2296 if (Ty->isBitIntType()) {
2297 if (!Context.getTargetInfo().hasBitIntType()) {
2298 PartialDiagnostic PD = PDiag(DiagID: diag::err_target_unsupported_type);
2299 if (D)
2300 PD << D;
2301 else
2302 PD << "expression";
2303 targetDiag(Loc, PD, FD)
2304 << false /*show bit size*/ << 0 /*bitsize*/ << false /*return*/
2305 << Ty << Context.getTargetInfo().getTriple().str();
2306 }
2307 return;
2308 }
2309
2310 // Check if we are dealing with two 'long double' but with different
2311 // semantics.
2312 bool LongDoubleMismatched = false;
2313 if (Ty->isRealFloatingType() && Context.getTypeSize(T: Ty) == 128) {
2314 const llvm::fltSemantics &Sem = Context.getFloatTypeSemantics(T: Ty);
2315 if ((&Sem != &llvm::APFloat::PPCDoubleDouble() &&
2316 !Context.getTargetInfo().hasFloat128Type()) ||
2317 (&Sem == &llvm::APFloat::PPCDoubleDouble() &&
2318 !Context.getTargetInfo().hasIbm128Type()))
2319 LongDoubleMismatched = true;
2320 }
2321
2322 if ((Ty->isFloat16Type() && !Context.getTargetInfo().hasFloat16Type()) ||
2323 (Ty->isFloat128Type() && !Context.getTargetInfo().hasFloat128Type()) ||
2324 (Ty->isIbm128Type() && !Context.getTargetInfo().hasIbm128Type()) ||
2325 (Ty->isIntegerType() && Context.getTypeSize(T: Ty) == 128 &&
2326 !Context.getTargetInfo().hasInt128Type()) ||
2327 (Ty->isBFloat16Type() && !Context.getTargetInfo().hasBFloat16Type() &&
2328 !LangOpts.CUDAIsDevice) ||
2329 LongDoubleMismatched) {
2330 PartialDiagnostic PD = PDiag(DiagID: diag::err_target_unsupported_type);
2331 if (D)
2332 PD << D;
2333 else
2334 PD << "expression";
2335
2336 if (targetDiag(Loc, PD, FD)
2337 << true /*show bit size*/
2338 << static_cast<unsigned>(Context.getTypeSize(T: Ty)) << Ty
2339 << false /*return*/ << Context.getTargetInfo().getTriple().str()) {
2340 if (D)
2341 D->setInvalidDecl();
2342 }
2343 if (D)
2344 targetDiag(Loc: D->getLocation(), DiagID: diag::note_defined_here, FD) << D;
2345 }
2346 };
2347
2348 auto CheckType = [&](QualType Ty, bool IsRetTy = false) {
2349 if (LangOpts.SYCLIsDevice ||
2350 (LangOpts.OpenMP && LangOpts.OpenMPIsTargetDevice) ||
2351 LangOpts.CUDAIsDevice)
2352 CheckDeviceType(Ty);
2353
2354 QualType UnqualTy = Ty.getCanonicalType().getUnqualifiedType();
2355 const TargetInfo &TI = Context.getTargetInfo();
2356 if (!TI.hasLongDoubleType() && UnqualTy == Context.LongDoubleTy) {
2357 PartialDiagnostic PD = PDiag(DiagID: diag::err_target_unsupported_type);
2358 if (D)
2359 PD << D;
2360 else
2361 PD << "expression";
2362
2363 if (Diag(Loc, PD) << false /*show bit size*/ << 0 << Ty
2364 << false /*return*/
2365 << TI.getTriple().str()) {
2366 if (D)
2367 D->setInvalidDecl();
2368 }
2369 if (D)
2370 targetDiag(Loc: D->getLocation(), DiagID: diag::note_defined_here, FD) << D;
2371 }
2372
2373 bool IsDouble = UnqualTy == Context.DoubleTy;
2374 bool IsFloat = UnqualTy == Context.FloatTy;
2375 if (IsRetTy && !TI.hasFPReturn() && (IsDouble || IsFloat)) {
2376 PartialDiagnostic PD = PDiag(DiagID: diag::err_target_unsupported_type);
2377 if (D)
2378 PD << D;
2379 else
2380 PD << "expression";
2381
2382 if (Diag(Loc, PD) << false /*show bit size*/ << 0 << Ty << true /*return*/
2383 << TI.getTriple().str()) {
2384 if (D)
2385 D->setInvalidDecl();
2386 }
2387 if (D)
2388 targetDiag(Loc: D->getLocation(), DiagID: diag::note_defined_here, FD) << D;
2389 }
2390
2391 if (TI.hasRISCVVTypes() && Ty->isRVVSizelessBuiltinType() && FD) {
2392 llvm::StringMap<bool> CallerFeatureMap;
2393 Context.getFunctionFeatureMap(FeatureMap&: CallerFeatureMap, FD);
2394 RISCV().checkRVVTypeSupport(Ty, Loc, D, FeatureMap: CallerFeatureMap);
2395 }
2396
2397 // Don't allow SVE types in functions without a SVE target.
2398 if (Ty->isSVESizelessBuiltinType() && FD) {
2399 llvm::StringMap<bool> CallerFeatureMap;
2400 Context.getFunctionFeatureMap(FeatureMap&: CallerFeatureMap, FD);
2401 ARM().checkSVETypeSupport(Ty, Loc, FD, FeatureMap: CallerFeatureMap);
2402 }
2403
2404 if (auto *VT = Ty->getAs<VectorType>();
2405 VT && FD &&
2406 (VT->getVectorKind() == VectorKind::SveFixedLengthData ||
2407 VT->getVectorKind() == VectorKind::SveFixedLengthPredicate) &&
2408 (LangOpts.VScaleMin != LangOpts.VScaleStreamingMin ||
2409 LangOpts.VScaleMax != LangOpts.VScaleStreamingMax)) {
2410 if (IsArmStreamingFunction(FD, /*IncludeLocallyStreaming=*/true)) {
2411 Diag(Loc, DiagID: diag::err_sve_fixed_vector_in_streaming_function)
2412 << Ty << /*Streaming*/ 0;
2413 } else if (const auto *FTy = FD->getType()->getAs<FunctionProtoType>()) {
2414 if (FTy->getAArch64SMEAttributes() &
2415 FunctionType::SME_PStateSMCompatibleMask) {
2416 Diag(Loc, DiagID: diag::err_sve_fixed_vector_in_streaming_function)
2417 << Ty << /*StreamingCompatible*/ 1;
2418 }
2419 }
2420 }
2421 };
2422
2423 CheckType(Ty);
2424 if (const auto *FPTy = dyn_cast<FunctionProtoType>(Val&: Ty)) {
2425 for (const auto &ParamTy : FPTy->param_types())
2426 CheckType(ParamTy);
2427 CheckType(FPTy->getReturnType(), /*IsRetTy=*/true);
2428 }
2429 if (const auto *FNPTy = dyn_cast<FunctionNoProtoType>(Val&: Ty))
2430 CheckType(FNPTy->getReturnType(), /*IsRetTy=*/true);
2431}
2432
2433bool Sema::findMacroSpelling(SourceLocation &locref, StringRef name) {
2434 SourceLocation loc = locref;
2435 if (!loc.isMacroID()) return false;
2436
2437 // There's no good way right now to look at the intermediate
2438 // expansions, so just jump to the expansion location.
2439 loc = getSourceManager().getExpansionLoc(Loc: loc);
2440
2441 // If that's written with the name, stop here.
2442 SmallString<16> buffer;
2443 if (getPreprocessor().getSpelling(loc, buffer) == name) {
2444 locref = loc;
2445 return true;
2446 }
2447 return false;
2448}
2449
2450Scope *Sema::getScopeForContext(DeclContext *Ctx) {
2451
2452 if (!Ctx)
2453 return nullptr;
2454
2455 Ctx = Ctx->getPrimaryContext();
2456 for (Scope *S = getCurScope(); S; S = S->getParent()) {
2457 // Ignore scopes that cannot have declarations. This is important for
2458 // out-of-line definitions of static class members.
2459 if (S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope))
2460 if (DeclContext *Entity = S->getEntity())
2461 if (Ctx == Entity->getPrimaryContext())
2462 return S;
2463 }
2464
2465 return nullptr;
2466}
2467
2468/// Enter a new function scope
2469void Sema::PushFunctionScope() {
2470 if (FunctionScopes.empty() && CachedFunctionScope) {
2471 // Use CachedFunctionScope to avoid allocating memory when possible.
2472 CachedFunctionScope->Clear();
2473 FunctionScopes.push_back(Elt: CachedFunctionScope.release());
2474 } else {
2475 FunctionScopes.push_back(Elt: new FunctionScopeInfo(getDiagnostics()));
2476 }
2477 if (LangOpts.OpenMP)
2478 OpenMP().pushOpenMPFunctionRegion();
2479}
2480
2481void Sema::PushBlockScope(Scope *BlockScope, BlockDecl *Block) {
2482 FunctionScopes.push_back(Elt: new BlockScopeInfo(getDiagnostics(),
2483 BlockScope, Block));
2484 CapturingFunctionScopes++;
2485}
2486
2487LambdaScopeInfo *Sema::PushLambdaScope() {
2488 LambdaScopeInfo *const LSI = new LambdaScopeInfo(getDiagnostics());
2489 FunctionScopes.push_back(Elt: LSI);
2490 CapturingFunctionScopes++;
2491 return LSI;
2492}
2493
2494void Sema::RecordParsingTemplateParameterDepth(unsigned Depth) {
2495 if (LambdaScopeInfo *const LSI = getCurLambda()) {
2496 LSI->AutoTemplateParameterDepth = Depth;
2497 return;
2498 }
2499 llvm_unreachable(
2500 "Remove assertion if intentionally called in a non-lambda context.");
2501}
2502
2503// Check that the type of the VarDecl has an accessible copy constructor and
2504// resolve its destructor's exception specification.
2505// This also performs initialization of block variables when they are moved
2506// to the heap. It uses the same rules as applicable for implicit moves
2507// according to the C++ standard in effect ([class.copy.elision]p3).
2508static void checkEscapingByref(VarDecl *VD, Sema &S) {
2509 QualType T = VD->getType();
2510 EnterExpressionEvaluationContext scope(
2511 S, Sema::ExpressionEvaluationContext::PotentiallyEvaluated);
2512 SourceLocation Loc = VD->getLocation();
2513 Expr *VarRef =
2514 new (S.Context) DeclRefExpr(S.Context, VD, false, T, VK_LValue, Loc);
2515 ExprResult Result;
2516 auto IE = InitializedEntity::InitializeBlock(BlockVarLoc: Loc, Type: T);
2517 if (S.getLangOpts().CPlusPlus23) {
2518 auto *E = ImplicitCastExpr::Create(Context: S.Context, T, Kind: CK_NoOp, Operand: VarRef, BasePath: nullptr,
2519 Cat: VK_XValue, FPO: FPOptionsOverride());
2520 Result = S.PerformCopyInitialization(Entity: IE, EqualLoc: SourceLocation(), Init: E);
2521 } else {
2522 Result = S.PerformMoveOrCopyInitialization(
2523 Entity: IE, NRInfo: Sema::NamedReturnInfo{.Candidate: VD, .S: Sema::NamedReturnInfo::MoveEligible},
2524 Value: VarRef);
2525 }
2526
2527 if (!Result.isInvalid()) {
2528 Result = S.MaybeCreateExprWithCleanups(SubExpr: Result);
2529 Expr *Init = Result.getAs<Expr>();
2530 S.Context.setBlockVarCopyInit(VD, CopyExpr: Init, CanThrow: S.canThrow(E: Init));
2531 }
2532
2533 // The destructor's exception specification is needed when IRGen generates
2534 // block copy/destroy functions. Resolve it here.
2535 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
2536 if (CXXDestructorDecl *DD = RD->getDestructor()) {
2537 auto *FPT = DD->getType()->castAs<FunctionProtoType>();
2538 S.ResolveExceptionSpec(Loc, FPT);
2539 }
2540}
2541
2542static void markEscapingByrefs(const FunctionScopeInfo &FSI, Sema &S) {
2543 // Set the EscapingByref flag of __block variables captured by
2544 // escaping blocks.
2545 for (const BlockDecl *BD : FSI.Blocks) {
2546 for (const BlockDecl::Capture &BC : BD->captures()) {
2547 VarDecl *VD = BC.getVariable();
2548 if (VD->hasAttr<BlocksAttr>()) {
2549 // Nothing to do if this is a __block variable captured by a
2550 // non-escaping block.
2551 if (BD->doesNotEscape())
2552 continue;
2553 VD->setEscapingByref();
2554 }
2555 // Check whether the captured variable is or contains an object of
2556 // non-trivial C union type.
2557 QualType CapType = BC.getVariable()->getType();
2558 if (CapType.hasNonTrivialToPrimitiveDestructCUnion() ||
2559 CapType.hasNonTrivialToPrimitiveCopyCUnion())
2560 S.checkNonTrivialCUnion(QT: BC.getVariable()->getType(),
2561 Loc: BD->getCaretLocation(),
2562 UseContext: NonTrivialCUnionContext::BlockCapture,
2563 NonTrivialKind: Sema::NTCUK_Destruct | Sema::NTCUK_Copy);
2564 }
2565 }
2566
2567 for (VarDecl *VD : FSI.ByrefBlockVars) {
2568 // __block variables might require us to capture a copy-initializer.
2569 if (!VD->isEscapingByref())
2570 continue;
2571 // It's currently invalid to ever have a __block variable with an
2572 // array type; should we diagnose that here?
2573 // Regardless, we don't want to ignore array nesting when
2574 // constructing this copy.
2575 if (VD->getType()->isStructureOrClassType())
2576 checkEscapingByref(VD, S);
2577 }
2578}
2579
2580Sema::PoppedFunctionScopePtr
2581Sema::PopFunctionScopeInfo(const AnalysisBasedWarnings::Policy *WP, Decl *D,
2582 QualType BlockType) {
2583 assert(!FunctionScopes.empty() && "mismatched push/pop!");
2584
2585 markEscapingByrefs(FSI: *FunctionScopes.back(), S&: *this);
2586
2587 PoppedFunctionScopePtr Scope(FunctionScopes.pop_back_val(),
2588 PoppedFunctionScopeDeleter(this));
2589
2590 if (LangOpts.OpenMP)
2591 OpenMP().popOpenMPFunctionRegion(OldFSI: Scope.get());
2592
2593 // Issue any analysis-based warnings.
2594 if (WP && D) {
2595 inferNoReturnAttr(S&: *this, D);
2596 AnalysisWarnings.IssueWarnings(P: *WP, fscope: Scope.get(), D, BlockType);
2597 } else
2598 for (const auto &PUD : Scope->PossiblyUnreachableDiags)
2599 Diag(Loc: PUD.Loc, PD: PUD.PD);
2600
2601 return Scope;
2602}
2603
2604void Sema::PoppedFunctionScopeDeleter::
2605operator()(sema::FunctionScopeInfo *Scope) const {
2606 if (!Scope->isPlainFunction())
2607 Self->CapturingFunctionScopes--;
2608 // Stash the function scope for later reuse if it's for a normal function.
2609 if (Scope->isPlainFunction() && !Self->CachedFunctionScope)
2610 Self->CachedFunctionScope.reset(p: Scope);
2611 else
2612 delete Scope;
2613}
2614
2615void Sema::PushCompoundScope(bool IsStmtExpr) {
2616 getCurFunction()->CompoundScopes.push_back(
2617 Elt: CompoundScopeInfo(IsStmtExpr, getCurFPFeatures()));
2618}
2619
2620void Sema::PopCompoundScope() {
2621 FunctionScopeInfo *CurFunction = getCurFunction();
2622 assert(!CurFunction->CompoundScopes.empty() && "mismatched push/pop");
2623
2624 CurFunction->CompoundScopes.pop_back();
2625}
2626
2627bool Sema::hasAnyUnrecoverableErrorsInThisFunction() const {
2628 return getCurFunction()->hasUnrecoverableErrorOccurred();
2629}
2630
2631void Sema::setFunctionHasBranchIntoScope() {
2632 if (!FunctionScopes.empty())
2633 FunctionScopes.back()->setHasBranchIntoScope();
2634}
2635
2636void Sema::setFunctionHasBranchProtectedScope() {
2637 if (!FunctionScopes.empty())
2638 FunctionScopes.back()->setHasBranchProtectedScope();
2639}
2640
2641void Sema::setFunctionHasIndirectGoto() {
2642 if (!FunctionScopes.empty())
2643 FunctionScopes.back()->setHasIndirectGoto();
2644}
2645
2646void Sema::setFunctionHasMustTail() {
2647 if (!FunctionScopes.empty())
2648 FunctionScopes.back()->setHasMustTail();
2649}
2650
2651BlockScopeInfo *Sema::getCurBlock() {
2652 if (FunctionScopes.empty())
2653 return nullptr;
2654
2655 auto CurBSI = dyn_cast<BlockScopeInfo>(Val: FunctionScopes.back());
2656 if (CurBSI && CurBSI->TheDecl &&
2657 !CurBSI->TheDecl->Encloses(DC: CurContext)) {
2658 // We have switched contexts due to template instantiation.
2659 assert(!CodeSynthesisContexts.empty());
2660 return nullptr;
2661 }
2662
2663 return CurBSI;
2664}
2665
2666FunctionScopeInfo *Sema::getEnclosingFunction() const {
2667 if (FunctionScopes.empty())
2668 return nullptr;
2669
2670 for (int e = FunctionScopes.size() - 1; e >= 0; --e) {
2671 if (isa<sema::BlockScopeInfo>(Val: FunctionScopes[e]))
2672 continue;
2673 return FunctionScopes[e];
2674 }
2675 return nullptr;
2676}
2677
2678CapturingScopeInfo *Sema::getEnclosingLambdaOrBlock() const {
2679 for (auto *Scope : llvm::reverse(C: FunctionScopes)) {
2680 if (auto *CSI = dyn_cast<CapturingScopeInfo>(Val: Scope)) {
2681 auto *LSI = dyn_cast<LambdaScopeInfo>(Val: CSI);
2682 if (LSI && LSI->Lambda && !LSI->Lambda->Encloses(DC: CurContext) &&
2683 LSI->AfterParameterList) {
2684 // We have switched contexts due to template instantiation.
2685 // FIXME: We should swap out the FunctionScopes during code synthesis
2686 // so that we don't need to check for this.
2687 assert(!CodeSynthesisContexts.empty());
2688 return nullptr;
2689 }
2690 return CSI;
2691 }
2692 }
2693 return nullptr;
2694}
2695
2696LambdaScopeInfo *Sema::getCurLambda(bool IgnoreNonLambdaCapturingScope) {
2697 if (FunctionScopes.empty())
2698 return nullptr;
2699
2700 auto I = FunctionScopes.rbegin();
2701 if (IgnoreNonLambdaCapturingScope) {
2702 auto E = FunctionScopes.rend();
2703 while (I != E && isa<CapturingScopeInfo>(Val: *I) && !isa<LambdaScopeInfo>(Val: *I))
2704 ++I;
2705 if (I == E)
2706 return nullptr;
2707 }
2708 auto *CurLSI = dyn_cast<LambdaScopeInfo>(Val: *I);
2709 if (CurLSI && CurLSI->Lambda && CurLSI->CallOperator &&
2710 !CurLSI->Lambda->Encloses(DC: CurContext) && CurLSI->AfterParameterList) {
2711 // We have switched contexts due to template instantiation.
2712 assert(!CodeSynthesisContexts.empty());
2713 return nullptr;
2714 }
2715
2716 return CurLSI;
2717}
2718
2719// We have a generic lambda if we parsed auto parameters, or we have
2720// an associated template parameter list.
2721LambdaScopeInfo *Sema::getCurGenericLambda() {
2722 if (LambdaScopeInfo *LSI = getCurLambda()) {
2723 return (LSI->TemplateParams.size() ||
2724 LSI->GLTemplateParameterList) ? LSI : nullptr;
2725 }
2726 return nullptr;
2727}
2728
2729
2730void Sema::ActOnComment(SourceRange Comment) {
2731 if (!LangOpts.RetainCommentsFromSystemHeaders &&
2732 SourceMgr.isInSystemHeader(Loc: Comment.getBegin()))
2733 return;
2734 RawComment RC(SourceMgr, Comment, LangOpts.CommentOpts, false);
2735 if (RC.isAlmostTrailingComment() || RC.hasUnsupportedSplice(SourceMgr)) {
2736 SourceRange MagicMarkerRange(Comment.getBegin(),
2737 Comment.getBegin().getLocWithOffset(Offset: 3));
2738 StringRef MagicMarkerText;
2739 switch (RC.getKind()) {
2740 case RawComment::RCK_OrdinaryBCPL:
2741 MagicMarkerText = "///<";
2742 break;
2743 case RawComment::RCK_OrdinaryC:
2744 MagicMarkerText = "/**<";
2745 break;
2746 case RawComment::RCK_Invalid:
2747 // FIXME: are there other scenarios that could produce an invalid
2748 // raw comment here?
2749 Diag(Loc: Comment.getBegin(), DiagID: diag::warn_splice_in_doxygen_comment);
2750 return;
2751 default:
2752 llvm_unreachable("if this is an almost Doxygen comment, "
2753 "it should be ordinary");
2754 }
2755 Diag(Loc: Comment.getBegin(), DiagID: diag::warn_not_a_doxygen_trailing_member_comment) <<
2756 FixItHint::CreateReplacement(RemoveRange: MagicMarkerRange, Code: MagicMarkerText);
2757 }
2758 Context.addComment(RC);
2759}
2760
2761// Pin this vtable to this file.
2762ExternalSemaSource::~ExternalSemaSource() {}
2763char ExternalSemaSource::ID;
2764
2765void ExternalSemaSource::ReadMethodPool(Selector Sel) { }
2766void ExternalSemaSource::updateOutOfDateSelector(Selector Sel) { }
2767
2768void ExternalSemaSource::ReadKnownNamespaces(
2769 SmallVectorImpl<NamespaceDecl *> &Namespaces) {
2770}
2771
2772void ExternalSemaSource::ReadUndefinedButUsed(
2773 llvm::MapVector<NamedDecl *, SourceLocation> &Undefined) {}
2774
2775void ExternalSemaSource::ReadMismatchingDeleteExpressions(llvm::MapVector<
2776 FieldDecl *, llvm::SmallVector<std::pair<SourceLocation, bool>, 4>> &) {}
2777
2778bool Sema::tryExprAsCall(Expr &E, QualType &ZeroArgCallReturnTy,
2779 UnresolvedSetImpl &OverloadSet) {
2780 ZeroArgCallReturnTy = QualType();
2781 OverloadSet.clear();
2782
2783 const OverloadExpr *Overloads = nullptr;
2784 bool IsMemExpr = false;
2785 if (E.getType() == Context.OverloadTy) {
2786 OverloadExpr::FindResult FR = OverloadExpr::find(E: &E);
2787
2788 // Ignore overloads that are pointer-to-member constants.
2789 if (FR.HasFormOfMemberPointer)
2790 return false;
2791
2792 Overloads = FR.Expression;
2793 } else if (E.getType() == Context.BoundMemberTy) {
2794 Overloads = dyn_cast<UnresolvedMemberExpr>(Val: E.IgnoreParens());
2795 IsMemExpr = true;
2796 }
2797
2798 bool Ambiguous = false;
2799 bool IsMV = false;
2800
2801 if (Overloads) {
2802 for (OverloadExpr::decls_iterator it = Overloads->decls_begin(),
2803 DeclsEnd = Overloads->decls_end(); it != DeclsEnd; ++it) {
2804 OverloadSet.addDecl(D: *it);
2805
2806 // Check whether the function is a non-template, non-member which takes no
2807 // arguments.
2808 if (IsMemExpr)
2809 continue;
2810 if (const FunctionDecl *OverloadDecl
2811 = dyn_cast<FunctionDecl>(Val: (*it)->getUnderlyingDecl())) {
2812 if (OverloadDecl->getMinRequiredArguments() == 0) {
2813 if (!ZeroArgCallReturnTy.isNull() && !Ambiguous &&
2814 (!IsMV || !(OverloadDecl->isCPUDispatchMultiVersion() ||
2815 OverloadDecl->isCPUSpecificMultiVersion()))) {
2816 ZeroArgCallReturnTy = QualType();
2817 Ambiguous = true;
2818 } else {
2819 ZeroArgCallReturnTy = OverloadDecl->getReturnType();
2820 IsMV = OverloadDecl->isCPUDispatchMultiVersion() ||
2821 OverloadDecl->isCPUSpecificMultiVersion();
2822 }
2823 }
2824 }
2825 }
2826
2827 // If it's not a member, use better machinery to try to resolve the call
2828 if (!IsMemExpr)
2829 return !ZeroArgCallReturnTy.isNull();
2830 }
2831
2832 // Attempt to call the member with no arguments - this will correctly handle
2833 // member templates with defaults/deduction of template arguments, overloads
2834 // with default arguments, etc.
2835 if (IsMemExpr && !E.isTypeDependent()) {
2836 Sema::TentativeAnalysisScope Trap(*this);
2837 ExprResult R = BuildCallToMemberFunction(S: nullptr, MemExpr: &E, LParenLoc: SourceLocation(), Args: {},
2838 RParenLoc: SourceLocation());
2839 if (R.isUsable()) {
2840 ZeroArgCallReturnTy = R.get()->getType();
2841 return true;
2842 }
2843 return false;
2844 }
2845
2846 if (const auto *DeclRef = dyn_cast<DeclRefExpr>(Val: E.IgnoreParens())) {
2847 if (const auto *Fun = dyn_cast<FunctionDecl>(Val: DeclRef->getDecl())) {
2848 if (Fun->getMinRequiredArguments() == 0)
2849 ZeroArgCallReturnTy = Fun->getReturnType();
2850 return true;
2851 }
2852 }
2853
2854 // We don't have an expression that's convenient to get a FunctionDecl from,
2855 // but we can at least check if the type is "function of 0 arguments".
2856 QualType ExprTy = E.getType();
2857 const FunctionType *FunTy = nullptr;
2858 QualType PointeeTy = ExprTy->getPointeeType();
2859 if (!PointeeTy.isNull())
2860 FunTy = PointeeTy->getAs<FunctionType>();
2861 if (!FunTy)
2862 FunTy = ExprTy->getAs<FunctionType>();
2863
2864 if (const auto *FPT = dyn_cast_if_present<FunctionProtoType>(Val: FunTy)) {
2865 if (FPT->getNumParams() == 0)
2866 ZeroArgCallReturnTy = FunTy->getReturnType();
2867 return true;
2868 }
2869 return false;
2870}
2871
2872/// Give notes for a set of overloads.
2873///
2874/// A companion to tryExprAsCall. In cases when the name that the programmer
2875/// wrote was an overloaded function, we may be able to make some guesses about
2876/// plausible overloads based on their return types; such guesses can be handed
2877/// off to this method to be emitted as notes.
2878///
2879/// \param Overloads - The overloads to note.
2880/// \param FinalNoteLoc - If we've suppressed printing some overloads due to
2881/// -fshow-overloads=best, this is the location to attach to the note about too
2882/// many candidates. Typically this will be the location of the original
2883/// ill-formed expression.
2884static void noteOverloads(Sema &S, const UnresolvedSetImpl &Overloads,
2885 const SourceLocation FinalNoteLoc) {
2886 unsigned ShownOverloads = 0;
2887 unsigned SuppressedOverloads = 0;
2888 for (UnresolvedSetImpl::iterator It = Overloads.begin(),
2889 DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
2890 if (ShownOverloads >= S.Diags.getNumOverloadCandidatesToShow()) {
2891 ++SuppressedOverloads;
2892 continue;
2893 }
2894
2895 const NamedDecl *Fn = (*It)->getUnderlyingDecl();
2896 // Don't print overloads for non-default multiversioned functions.
2897 if (const auto *FD = Fn->getAsFunction()) {
2898 if (FD->isMultiVersion() && FD->hasAttr<TargetAttr>() &&
2899 !FD->getAttr<TargetAttr>()->isDefaultVersion())
2900 continue;
2901 if (FD->isMultiVersion() && FD->hasAttr<TargetVersionAttr>() &&
2902 !FD->getAttr<TargetVersionAttr>()->isDefaultVersion())
2903 continue;
2904 }
2905 S.Diag(Loc: Fn->getLocation(), DiagID: diag::note_possible_target_of_call);
2906 ++ShownOverloads;
2907 }
2908
2909 S.Diags.overloadCandidatesShown(N: ShownOverloads);
2910
2911 if (SuppressedOverloads)
2912 S.Diag(Loc: FinalNoteLoc, DiagID: diag::note_ovl_too_many_candidates)
2913 << SuppressedOverloads;
2914}
2915
2916static void notePlausibleOverloads(Sema &S, SourceLocation Loc,
2917 const UnresolvedSetImpl &Overloads,
2918 bool (*IsPlausibleResult)(QualType)) {
2919 if (!IsPlausibleResult)
2920 return noteOverloads(S, Overloads, FinalNoteLoc: Loc);
2921
2922 UnresolvedSet<2> PlausibleOverloads;
2923 for (OverloadExpr::decls_iterator It = Overloads.begin(),
2924 DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
2925 const auto *OverloadDecl = cast<FunctionDecl>(Val: *It);
2926 QualType OverloadResultTy = OverloadDecl->getReturnType();
2927 if (IsPlausibleResult(OverloadResultTy))
2928 PlausibleOverloads.addDecl(D: It.getDecl());
2929 }
2930 noteOverloads(S, Overloads: PlausibleOverloads, FinalNoteLoc: Loc);
2931}
2932
2933/// Determine whether the given expression can be called by just
2934/// putting parentheses after it. Notably, expressions with unary
2935/// operators can't be because the unary operator will start parsing
2936/// outside the call.
2937static bool IsCallableWithAppend(const Expr *E) {
2938 E = E->IgnoreImplicit();
2939 return (!isa<CStyleCastExpr>(Val: E) &&
2940 !isa<UnaryOperator>(Val: E) &&
2941 !isa<BinaryOperator>(Val: E) &&
2942 !isa<CXXOperatorCallExpr>(Val: E));
2943}
2944
2945static bool IsCPUDispatchCPUSpecificMultiVersion(const Expr *E) {
2946 if (const auto *UO = dyn_cast<UnaryOperator>(Val: E))
2947 E = UO->getSubExpr();
2948
2949 if (const auto *ULE = dyn_cast<UnresolvedLookupExpr>(Val: E)) {
2950 if (ULE->getNumDecls() == 0)
2951 return false;
2952
2953 const NamedDecl *ND = *ULE->decls_begin();
2954 if (const auto *FD = dyn_cast<FunctionDecl>(Val: ND))
2955 return FD->isCPUDispatchMultiVersion() || FD->isCPUSpecificMultiVersion();
2956 }
2957 return false;
2958}
2959
2960bool Sema::tryToRecoverWithCall(ExprResult &E, const PartialDiagnostic &PD,
2961 bool ForceComplain,
2962 bool (*IsPlausibleResult)(QualType)) {
2963 SourceLocation Loc = E.get()->getExprLoc();
2964 SourceRange Range = E.get()->getSourceRange();
2965 UnresolvedSet<4> Overloads;
2966
2967 // If this is a SFINAE context, don't try anything that might trigger ADL
2968 // prematurely.
2969 if (!isSFINAEContext()) {
2970 QualType ZeroArgCallTy;
2971 if (tryExprAsCall(E&: *E.get(), ZeroArgCallReturnTy&: ZeroArgCallTy, OverloadSet&: Overloads) &&
2972 !ZeroArgCallTy.isNull() &&
2973 (!IsPlausibleResult || IsPlausibleResult(ZeroArgCallTy))) {
2974 // At this point, we know E is potentially callable with 0
2975 // arguments and that it returns something of a reasonable type,
2976 // so we can emit a fixit and carry on pretending that E was
2977 // actually a CallExpr.
2978 SourceLocation ParenInsertionLoc = getLocForEndOfToken(Loc: Range.getEnd());
2979 bool IsMV = IsCPUDispatchCPUSpecificMultiVersion(E: E.get());
2980 Diag(Loc, PD) << /*zero-arg*/ 1 << IsMV << Range
2981 << (IsCallableWithAppend(E: E.get())
2982 ? FixItHint::CreateInsertion(InsertionLoc: ParenInsertionLoc,
2983 Code: "()")
2984 : FixItHint());
2985 if (!IsMV)
2986 notePlausibleOverloads(S&: *this, Loc, Overloads, IsPlausibleResult);
2987
2988 // FIXME: Try this before emitting the fixit, and suppress diagnostics
2989 // while doing so.
2990 E = BuildCallExpr(S: nullptr, Fn: E.get(), LParenLoc: Range.getEnd(), ArgExprs: {},
2991 RParenLoc: Range.getEnd().getLocWithOffset(Offset: 1));
2992 return true;
2993 }
2994 }
2995 if (!ForceComplain) return false;
2996
2997 bool IsMV = IsCPUDispatchCPUSpecificMultiVersion(E: E.get());
2998 Diag(Loc, PD) << /*not zero-arg*/ 0 << IsMV << Range;
2999 if (!IsMV)
3000 notePlausibleOverloads(S&: *this, Loc, Overloads, IsPlausibleResult);
3001 E = ExprError();
3002 return true;
3003}
3004
3005IdentifierInfo *Sema::getSuperIdentifier() const {
3006 if (!Ident_super)
3007 Ident_super = &Context.Idents.get(Name: "super");
3008 return Ident_super;
3009}
3010
3011void Sema::PushCapturedRegionScope(Scope *S, CapturedDecl *CD, RecordDecl *RD,
3012 CapturedRegionKind K,
3013 unsigned OpenMPCaptureLevel) {
3014 auto *CSI = new CapturedRegionScopeInfo(
3015 getDiagnostics(), S, CD, RD, CD->getContextParam(), K,
3016 (getLangOpts().OpenMP && K == CR_OpenMP)
3017 ? OpenMP().getOpenMPNestingLevel()
3018 : 0,
3019 OpenMPCaptureLevel);
3020 CSI->ReturnType = Context.VoidTy;
3021 FunctionScopes.push_back(Elt: CSI);
3022 CapturingFunctionScopes++;
3023}
3024
3025CapturedRegionScopeInfo *Sema::getCurCapturedRegion() {
3026 if (FunctionScopes.empty())
3027 return nullptr;
3028
3029 return dyn_cast<CapturedRegionScopeInfo>(Val: FunctionScopes.back());
3030}
3031
3032const llvm::MapVector<FieldDecl *, Sema::DeleteLocs> &
3033Sema::getMismatchingDeleteExpressions() const {
3034 return DeleteExprs;
3035}
3036
3037Sema::FPFeaturesStateRAII::FPFeaturesStateRAII(Sema &S)
3038 : S(S), OldFPFeaturesState(S.CurFPFeatures),
3039 OldOverrides(S.FpPragmaStack.CurrentValue),
3040 OldEvalMethod(S.PP.getCurrentFPEvalMethod()),
3041 OldFPPragmaLocation(S.PP.getLastFPEvalPragmaLocation()) {}
3042
3043Sema::FPFeaturesStateRAII::~FPFeaturesStateRAII() {
3044 S.CurFPFeatures = OldFPFeaturesState;
3045 S.FpPragmaStack.CurrentValue = OldOverrides;
3046 S.PP.setCurrentFPEvalMethod(PragmaLoc: OldFPPragmaLocation, Val: OldEvalMethod);
3047}
3048
3049bool Sema::isDeclaratorFunctionLike(Declarator &D) {
3050 assert(D.getCXXScopeSpec().isSet() &&
3051 "can only be called for qualified names");
3052
3053 auto LR = LookupResult(*this, D.getIdentifier(), D.getBeginLoc(),
3054 LookupOrdinaryName, forRedeclarationInCurContext());
3055 DeclContext *DC = computeDeclContext(SS: D.getCXXScopeSpec(),
3056 EnteringContext: !D.getDeclSpec().isFriendSpecified());
3057 if (!DC)
3058 return false;
3059
3060 LookupQualifiedName(R&: LR, LookupCtx: DC);
3061 bool Result = llvm::all_of(Range&: LR, P: [](Decl *Dcl) {
3062 if (NamedDecl *ND = dyn_cast<NamedDecl>(Val: Dcl)) {
3063 ND = ND->getUnderlyingDecl();
3064 return isa<FunctionDecl>(Val: ND) || isa<FunctionTemplateDecl>(Val: ND) ||
3065 isa<UsingDecl>(Val: ND);
3066 }
3067 return false;
3068 });
3069 return Result;
3070}
3071
3072Attr *Sema::CreateAnnotationAttr(const AttributeCommonInfo &CI, StringRef Annot,
3073 MutableArrayRef<Expr *> Args) {
3074
3075 auto *A = AnnotateAttr::Create(Ctx&: Context, Annotation: Annot, Args: Args.data(), ArgsSize: Args.size(), CommonInfo: CI);
3076 if (!ConstantFoldAttrArgs(
3077 CI, Args: MutableArrayRef<Expr *>(A->args_begin(), A->args_end()))) {
3078 return nullptr;
3079 }
3080 return A;
3081}
3082
3083Attr *Sema::CreateAnnotationAttr(const ParsedAttr &AL) {
3084 // Make sure that there is a string literal as the annotation's first
3085 // argument.
3086 StringRef Str;
3087 if (!checkStringLiteralArgumentAttr(Attr: AL, ArgNum: 0, Str))
3088 return nullptr;
3089
3090 llvm::SmallVector<Expr *, 4> Args;
3091 Args.reserve(N: AL.getNumArgs() - 1);
3092 for (unsigned Idx = 1; Idx < AL.getNumArgs(); Idx++) {
3093 assert(!AL.isArgIdent(Idx));
3094 Args.push_back(Elt: AL.getArgAsExpr(Arg: Idx));
3095 }
3096
3097 return CreateAnnotationAttr(CI: AL, Annot: Str, Args);
3098}
3099