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 "SemaAPINotesInternal.h"
15#include "UsedDeclVisitor.h"
16#include "clang/AST/ASTContext.h"
17#include "clang/AST/ASTDiagnostic.h"
18#include "clang/AST/Decl.h"
19#include "clang/AST/DeclCXX.h"
20#include "clang/AST/DeclFriend.h"
21#include "clang/AST/DeclObjC.h"
22#include "clang/AST/Expr.h"
23#include "clang/AST/ExprCXX.h"
24#include "clang/AST/PrettyDeclStackTrace.h"
25#include "clang/AST/StmtCXX.h"
26#include "clang/AST/TypeOrdering.h"
27#include "clang/Basic/DarwinSDKInfo.h"
28#include "clang/Basic/DiagnosticOptions.h"
29#include "clang/Basic/PartialDiagnostic.h"
30#include "clang/Basic/SourceManager.h"
31#include "clang/Basic/TargetInfo.h"
32#include "clang/Lex/HeaderSearch.h"
33#include "clang/Lex/HeaderSearchOptions.h"
34#include "clang/Lex/Preprocessor.h"
35#include "clang/Sema/CXXFieldCollector.h"
36#include "clang/Sema/EnterExpressionEvaluationContext.h"
37#include "clang/Sema/ExternalSemaSource.h"
38#include "clang/Sema/Initialization.h"
39#include "clang/Sema/MultiplexExternalSemaSource.h"
40#include "clang/Sema/ObjCMethodList.h"
41#include "clang/Sema/RISCVIntrinsicManager.h"
42#include "clang/Sema/Scope.h"
43#include "clang/Sema/ScopeInfo.h"
44#include "clang/Sema/SemaAMDGPU.h"
45#include "clang/Sema/SemaARM.h"
46#include "clang/Sema/SemaAVR.h"
47#include "clang/Sema/SemaBPF.h"
48#include "clang/Sema/SemaCUDA.h"
49#include "clang/Sema/SemaCodeCompletion.h"
50#include "clang/Sema/SemaConsumer.h"
51#include "clang/Sema/SemaDirectX.h"
52#include "clang/Sema/SemaHLSL.h"
53#include "clang/Sema/SemaHexagon.h"
54#include "clang/Sema/SemaLoongArch.h"
55#include "clang/Sema/SemaM68k.h"
56#include "clang/Sema/SemaMIPS.h"
57#include "clang/Sema/SemaMSP430.h"
58#include "clang/Sema/SemaNVPTX.h"
59#include "clang/Sema/SemaObjC.h"
60#include "clang/Sema/SemaOpenACC.h"
61#include "clang/Sema/SemaOpenCL.h"
62#include "clang/Sema/SemaOpenMP.h"
63#include "clang/Sema/SemaPPC.h"
64#include "clang/Sema/SemaPseudoObject.h"
65#include "clang/Sema/SemaRISCV.h"
66#include "clang/Sema/SemaSPIRV.h"
67#include "clang/Sema/SemaSYCL.h"
68#include "clang/Sema/SemaSwift.h"
69#include "clang/Sema/SemaSystemZ.h"
70#include "clang/Sema/SemaWasm.h"
71#include "clang/Sema/SemaX86.h"
72#include "clang/Sema/TemplateDeduction.h"
73#include "clang/Sema/TypoCorrection.h"
74#include "llvm/ADT/DenseMap.h"
75#include "llvm/ADT/STLExtras.h"
76#include "llvm/ADT/SetVector.h"
77#include "llvm/ADT/SmallPtrSet.h"
78#include "llvm/Support/TimeProfiler.h"
79#include <optional>
80
81using namespace clang;
82using namespace sema;
83
84SourceLocation Sema::getLocForEndOfToken(SourceLocation Loc, unsigned Offset) {
85 return Lexer::getLocForEndOfToken(Loc, Offset, SM: SourceMgr, LangOpts);
86}
87
88SourceRange
89Sema::getRangeForNextToken(SourceLocation Loc, bool IncludeMacros,
90 bool IncludeComments,
91 std::optional<tok::TokenKind> ExpectedToken) {
92 if (!Loc.isValid())
93 return SourceRange();
94 std::optional<Token> NextToken =
95 Lexer::findNextToken(Loc, SM: SourceMgr, LangOpts, IncludeComments);
96 if (!NextToken)
97 return SourceRange();
98 if (ExpectedToken && NextToken->getKind() != *ExpectedToken)
99 return SourceRange();
100 SourceLocation TokenStart = NextToken->getLocation();
101 SourceLocation TokenEnd = NextToken->getLastLoc();
102 if (!TokenStart.isValid() || !TokenEnd.isValid())
103 return SourceRange();
104 if (!IncludeMacros && (TokenStart.isMacroID() || TokenEnd.isMacroID()))
105 return SourceRange();
106
107 return SourceRange(TokenStart, TokenEnd);
108}
109
110ModuleLoader &Sema::getModuleLoader() const { return PP.getModuleLoader(); }
111
112DarwinSDKInfo *
113Sema::getDarwinSDKInfoForAvailabilityChecking(SourceLocation Loc,
114 StringRef Platform) {
115 auto *SDKInfo = getDarwinSDKInfoForAvailabilityChecking();
116 if (!SDKInfo && !WarnedDarwinSDKInfoMissing) {
117 Diag(Loc, DiagID: diag::warn_missing_sdksettings_for_availability_checking)
118 << Platform;
119 WarnedDarwinSDKInfoMissing = true;
120 }
121 return SDKInfo;
122}
123
124DarwinSDKInfo *Sema::getDarwinSDKInfoForAvailabilityChecking() {
125 if (CachedDarwinSDKInfo)
126 return CachedDarwinSDKInfo->get();
127 auto SDKInfo = parseDarwinSDKInfo(
128 VFS&: PP.getFileManager().getVirtualFileSystem(),
129 SDKRootPath: PP.getHeaderSearchInfo().getHeaderSearchOpts().Sysroot);
130 if (SDKInfo && *SDKInfo) {
131 CachedDarwinSDKInfo = std::make_unique<DarwinSDKInfo>(args: std::move(**SDKInfo));
132 return CachedDarwinSDKInfo->get();
133 }
134 if (!SDKInfo)
135 llvm::consumeError(Err: SDKInfo.takeError());
136 CachedDarwinSDKInfo = std::unique_ptr<DarwinSDKInfo>();
137 return nullptr;
138}
139
140IdentifierInfo *Sema::InventAbbreviatedTemplateParameterTypeName(
141 const IdentifierInfo *ParamName, unsigned int Index) {
142 std::string InventedName;
143 llvm::raw_string_ostream OS(InventedName);
144
145 if (!ParamName)
146 OS << "auto:" << Index + 1;
147 else
148 OS << ParamName->getName() << ":auto";
149
150 return &Context.Idents.get(Name: OS.str());
151}
152
153PrintingPolicy Sema::getPrintingPolicy(const ASTContext &Context,
154 const Preprocessor &PP) {
155 PrintingPolicy Policy = Context.getPrintingPolicy();
156 // In diagnostics, we print _Bool as bool if the latter is defined as the
157 // former.
158 Policy.Bool = Context.getLangOpts().Bool;
159 if (!Policy.Bool) {
160 if (const MacroInfo *BoolMacro = PP.getMacroInfo(II: Context.getBoolName())) {
161 Policy.Bool = BoolMacro->isObjectLike() &&
162 BoolMacro->getNumTokens() == 1 &&
163 BoolMacro->getReplacementToken(Tok: 0).is(K: tok::kw__Bool);
164 }
165 }
166
167 // Shorten the data output if needed
168 Policy.EntireContentsOfLargeArray = false;
169
170 return Policy;
171}
172
173void Sema::ActOnTranslationUnitScope(Scope *S) {
174 TUScope = S;
175 PushDeclContext(S, DC: Context.getTranslationUnitDecl());
176}
177
178namespace clang {
179namespace sema {
180
181class SemaPPCallbacks : public PPCallbacks {
182 Sema *S = nullptr;
183 llvm::SmallVector<SourceLocation, 8> IncludeStack;
184 llvm::SmallVector<llvm::TimeTraceProfilerEntry *, 8> ProfilerStack;
185
186public:
187 void set(Sema &S) { this->S = &S; }
188
189 void reset() { S = nullptr; }
190
191 void FileChanged(SourceLocation Loc, FileChangeReason Reason,
192 SrcMgr::CharacteristicKind FileType,
193 FileID PrevFID) override {
194 if (!S)
195 return;
196 switch (Reason) {
197 case EnterFile: {
198 SourceManager &SM = S->getSourceManager();
199 SourceLocation IncludeLoc = SM.getIncludeLoc(FID: SM.getFileID(SpellingLoc: Loc));
200 if (IncludeLoc.isValid()) {
201 if (llvm::timeTraceProfilerEnabled()) {
202 OptionalFileEntryRef FE = SM.getFileEntryRefForID(FID: SM.getFileID(SpellingLoc: Loc));
203 ProfilerStack.push_back(Elt: llvm::timeTraceAsyncProfilerBegin(
204 Name: "Source", Detail: FE ? FE->getName() : StringRef("<unknown>")));
205 }
206
207 IncludeStack.push_back(Elt: IncludeLoc);
208 S->DiagnoseNonDefaultPragmaAlignPack(
209 Kind: Sema::PragmaAlignPackDiagnoseKind::NonDefaultStateAtInclude,
210 IncludeLoc);
211 }
212 break;
213 }
214 case ExitFile:
215 if (!IncludeStack.empty()) {
216 if (llvm::timeTraceProfilerEnabled())
217 llvm::timeTraceProfilerEnd(E: ProfilerStack.pop_back_val());
218
219 S->DiagnoseNonDefaultPragmaAlignPack(
220 Kind: Sema::PragmaAlignPackDiagnoseKind::ChangedStateAtExit,
221 IncludeLoc: IncludeStack.pop_back_val());
222 }
223 break;
224 default:
225 break;
226 }
227 }
228 void PragmaDiagnostic(SourceLocation Loc, StringRef Namespace,
229 diag::Severity Mapping, StringRef Str) override {
230 // The pragma changed diagnostic severities; drop any cached state
231 // derived from the previous one.
232 S->AnalysisWarnings.clearPolicyCache();
233 S->clearDocumentationDiagsCache();
234
235 // If one of the analysis-based diagnostics was enabled while processing
236 // a function, we want to note it in the analysis-based warnings so they
237 // can be run at the end of the function body even if the analysis warnings
238 // are disabled at that point.
239 SmallVector<diag::kind, 256> GroupDiags;
240 diag::Flavor Flavor =
241 Str[1] == 'W' ? diag::Flavor::WarningOrError : diag::Flavor::Remark;
242 StringRef Group = Str.substr(Start: 2);
243
244 if (S->PP.getDiagnostics().getDiagnosticIDs()->getDiagnosticsInGroup(
245 Flavor, Group, Diags&: GroupDiags))
246 return;
247
248 for (diag::kind K : GroupDiags) {
249 // Note: the cases in this switch should be kept in sync with the
250 // diagnostics in AnalysisBasedWarnings::getPolicyInEffectAt().
251 AnalysisBasedWarnings::Policy &Override =
252 S->AnalysisWarnings.getPolicyOverrides();
253 switch (K) {
254 default: break;
255 case diag::warn_unreachable:
256 case diag::warn_unreachable_break:
257 case diag::warn_unreachable_return:
258 case diag::warn_unreachable_loop_increment:
259 Override.enableCheckUnreachable = true;
260 break;
261 case diag::warn_double_lock:
262 Override.enableThreadSafetyAnalysis = true;
263 break;
264 case diag::warn_use_in_invalid_state:
265 Override.enableConsumedAnalysis = true;
266 break;
267 }
268 }
269 }
270};
271
272} // end namespace sema
273} // end namespace clang
274
275const unsigned Sema::MaxAlignmentExponent;
276const uint64_t Sema::MaximumAlignment;
277
278Sema::Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
279 TranslationUnitKind TUKind, CodeCompleteConsumer *CodeCompleter)
280 : SemaBase(*this), CollectStats(false), TUKind(TUKind),
281 CurFPFeatures(pp.getLangOpts()), LangOpts(pp.getLangOpts()), PP(pp),
282 Context(ctxt), Consumer(consumer), Diags(PP.getDiagnostics()),
283 SourceMgr(PP.getSourceManager()), APINotes(SourceMgr, LangOpts),
284 AnalysisWarnings(*this), ThreadSafetyDeclCache(nullptr),
285 LateTemplateParser(nullptr), OpaqueParser(nullptr), CurContext(nullptr),
286 ExternalSource(nullptr), StackHandler(Diags), CurScope(nullptr),
287 Ident_super(nullptr), AMDGPUPtr(std::make_unique<SemaAMDGPU>(args&: *this)),
288 ARMPtr(std::make_unique<SemaARM>(args&: *this)),
289 AVRPtr(std::make_unique<SemaAVR>(args&: *this)),
290 BPFPtr(std::make_unique<SemaBPF>(args&: *this)),
291 CodeCompletionPtr(
292 std::make_unique<SemaCodeCompletion>(args&: *this, args&: CodeCompleter)),
293 CUDAPtr(std::make_unique<SemaCUDA>(args&: *this)),
294 DirectXPtr(std::make_unique<SemaDirectX>(args&: *this)),
295 HLSLPtr(std::make_unique<SemaHLSL>(args&: *this)),
296 HexagonPtr(std::make_unique<SemaHexagon>(args&: *this)),
297 LoongArchPtr(std::make_unique<SemaLoongArch>(args&: *this)),
298 M68kPtr(std::make_unique<SemaM68k>(args&: *this)),
299 MIPSPtr(std::make_unique<SemaMIPS>(args&: *this)),
300 MSP430Ptr(std::make_unique<SemaMSP430>(args&: *this)),
301 NVPTXPtr(std::make_unique<SemaNVPTX>(args&: *this)),
302 ObjCPtr(std::make_unique<SemaObjC>(args&: *this)),
303 OpenACCPtr(std::make_unique<SemaOpenACC>(args&: *this)),
304 OpenCLPtr(std::make_unique<SemaOpenCL>(args&: *this)),
305 OpenMPPtr(std::make_unique<SemaOpenMP>(args&: *this)),
306 PPCPtr(std::make_unique<SemaPPC>(args&: *this)),
307 PseudoObjectPtr(std::make_unique<SemaPseudoObject>(args&: *this)),
308 RISCVPtr(std::make_unique<SemaRISCV>(args&: *this)),
309 SPIRVPtr(std::make_unique<SemaSPIRV>(args&: *this)),
310 SYCLPtr(std::make_unique<SemaSYCL>(args&: *this)),
311 SwiftPtr(std::make_unique<SemaSwift>(args&: *this)),
312 SystemZPtr(std::make_unique<SemaSystemZ>(args&: *this)),
313 WasmPtr(std::make_unique<SemaWasm>(args&: *this)),
314 X86Ptr(std::make_unique<SemaX86>(args&: *this)),
315 MSPointerToMemberRepresentationMethod(
316 LangOpts.getMSPointerToMemberRepresentationMethod()),
317 MSStructPragmaOn(false), VtorDispStack(LangOpts.getVtorDispMode()),
318 AlignPackStack(AlignPackInfo(getLangOpts().XLPragmaPack)),
319 DataSegStack(nullptr), BSSSegStack(nullptr), ConstSegStack(nullptr),
320 CodeSegStack(nullptr), StrictGuardStackCheckStack(false),
321 FpPragmaStack(FPOptionsOverride()), CurInitSeg(nullptr),
322 VisContext(nullptr), PragmaAttributeCurrentTargetDecl(nullptr),
323 StdCoroutineTraitsCache(nullptr), IdResolver(pp),
324 OriginalLexicalContext(nullptr), StdInitializerList(nullptr),
325 StdTypeIdentity(nullptr),
326 FullyCheckedComparisonCategories(
327 static_cast<unsigned>(ComparisonCategoryType::Last) + 1),
328 StdSourceLocationImplDecl(nullptr), CXXTypeInfoDecl(nullptr),
329 GlobalNewDeleteDeclared(false), DisableTypoCorrection(false),
330 TyposCorrected(0), IsBuildingRecoveryCallExpr(false),
331 CurrentInstantiationScope(nullptr), NonInstantiationEntries(0),
332 ArgPackSubstIndex(std::nullopt), SatisfactionCache(Context) {
333 assert(pp.TUKind == TUKind);
334 TUScope = nullptr;
335
336 LoadedExternalKnownNamespaces = false;
337 for (unsigned I = 0; I != NSAPI::NumNSNumberLiteralMethods; ++I)
338 ObjC().NSNumberLiteralMethods[I] = nullptr;
339
340 if (getLangOpts().ObjC)
341 ObjC().NSAPIObj.reset(p: new NSAPI(Context));
342
343 if (getLangOpts().CPlusPlus)
344 FieldCollector.reset(p: new CXXFieldCollector());
345
346 // Tell diagnostics how to render things from the AST library.
347 Diags.SetArgToStringFn(Fn: &FormatASTNodeDiagnosticArgument, Cookie: &Context);
348
349 // This evaluation context exists to ensure that there's always at least one
350 // valid evaluation context available. It is never removed from the
351 // evaluation stack.
352 ExprEvalContexts.emplace_back(
353 Args: ExpressionEvaluationContext::PotentiallyEvaluated, Args: 0, Args: CleanupInfo{},
354 Args: nullptr, Args: ExpressionEvaluationContextRecord::EK_Other);
355
356 // Initialization of data sharing attributes stack for OpenMP
357 OpenMP().InitDataSharingAttributesStack();
358
359 std::unique_ptr<sema::SemaPPCallbacks> Callbacks =
360 std::make_unique<sema::SemaPPCallbacks>();
361 SemaPPCallbackHandler = Callbacks.get();
362 PP.addPPCallbacks(C: std::move(Callbacks));
363 SemaPPCallbackHandler->set(*this);
364
365 CurFPFeatures.setFPEvalMethod(PP.getCurrentFPEvalMethod());
366}
367
368// Anchor Sema's type info to this TU.
369void Sema::anchor() {}
370
371void Sema::addImplicitTypedef(StringRef Name, QualType T) {
372 DeclarationName DN = &Context.Idents.get(Name);
373 if (IdResolver.begin(Name: DN) == IdResolver.end())
374 PushOnScopeChains(D: Context.buildImplicitTypedef(T, Name), S: TUScope);
375}
376
377void Sema::Initialize() {
378 // Create BuiltinVaListDecl *before* ExternalSemaSource::InitializeSema(this)
379 // because during initialization ASTReader can emit globals that require
380 // name mangling. And the name mangling uses BuiltinVaListDecl.
381 if (Context.getTargetInfo().hasBuiltinMSVaList())
382 (void)Context.getBuiltinMSVaListDecl();
383 if (Context.getTargetInfo().hasBuiltinZOSVaList())
384 (void)Context.getBuiltinZOSVaListDecl();
385 (void)Context.getBuiltinVaListDecl();
386
387 if (SemaConsumer *SC = dyn_cast<SemaConsumer>(Val: &Consumer))
388 SC->InitializeSema(S&: *this);
389
390 // Tell the external Sema source about this Sema object.
391 if (ExternalSemaSource *ExternalSema
392 = dyn_cast_or_null<ExternalSemaSource>(Val: Context.getExternalSource()))
393 ExternalSema->InitializeSema(S&: *this);
394
395 // This needs to happen after ExternalSemaSource::InitializeSema(this) or we
396 // will not be able to merge any duplicate __va_list_tag decls correctly.
397 VAListTagName = PP.getIdentifierInfo(Name: "__va_list_tag");
398
399 if (!TUScope)
400 return;
401
402 // Initialize predefined 128-bit integer types, if needed.
403 if (Context.getTargetInfo().hasInt128Type() ||
404 (Context.getAuxTargetInfo() &&
405 Context.getAuxTargetInfo()->hasInt128Type())) {
406 // If either of the 128-bit integer types are unavailable to name lookup,
407 // define them now.
408 DeclarationName Int128 = &Context.Idents.get(Name: "__int128_t");
409 if (IdResolver.begin(Name: Int128) == IdResolver.end())
410 PushOnScopeChains(D: Context.getInt128Decl(), S: TUScope);
411
412 DeclarationName UInt128 = &Context.Idents.get(Name: "__uint128_t");
413 if (IdResolver.begin(Name: UInt128) == IdResolver.end())
414 PushOnScopeChains(D: Context.getUInt128Decl(), S: TUScope);
415 }
416
417
418 // Initialize predefined Objective-C types:
419 if (getLangOpts().ObjC) {
420 // If 'SEL' does not yet refer to any declarations, make it refer to the
421 // predefined 'SEL'.
422 DeclarationName SEL = &Context.Idents.get(Name: "SEL");
423 if (IdResolver.begin(Name: SEL) == IdResolver.end())
424 PushOnScopeChains(D: Context.getObjCSelDecl(), S: TUScope);
425
426 // If 'id' does not yet refer to any declarations, make it refer to the
427 // predefined 'id'.
428 DeclarationName Id = &Context.Idents.get(Name: "id");
429 if (IdResolver.begin(Name: Id) == IdResolver.end())
430 PushOnScopeChains(D: Context.getObjCIdDecl(), S: TUScope);
431
432 // Create the built-in typedef for 'Class'.
433 DeclarationName Class = &Context.Idents.get(Name: "Class");
434 if (IdResolver.begin(Name: Class) == IdResolver.end())
435 PushOnScopeChains(D: Context.getObjCClassDecl(), S: TUScope);
436
437 // Create the built-in forward declaratino for 'Protocol'.
438 DeclarationName Protocol = &Context.Idents.get(Name: "Protocol");
439 if (IdResolver.begin(Name: Protocol) == IdResolver.end())
440 PushOnScopeChains(D: Context.getObjCProtocolDecl(), S: TUScope);
441 }
442
443 // Create the internal type for the *StringMakeConstantString builtins.
444 DeclarationName ConstantString = &Context.Idents.get(Name: "__NSConstantString");
445 if (IdResolver.begin(Name: ConstantString) == IdResolver.end())
446 PushOnScopeChains(D: Context.getCFConstantStringDecl(), S: TUScope);
447
448 // Initialize Microsoft "predefined C++ types".
449 if (getLangOpts().MSVCCompat) {
450 if (getLangOpts().CPlusPlus &&
451 IdResolver.begin(Name: &Context.Idents.get(Name: "type_info")) == IdResolver.end())
452 PushOnScopeChains(D: Context.getMSTypeInfoTagDecl(), S: TUScope);
453
454 addImplicitTypedef(Name: "size_t", T: Context.getSizeType());
455 }
456
457 // Initialize predefined OpenCL types and supported extensions and (optional)
458 // core features.
459 if (getLangOpts().OpenCL) {
460 getOpenCLOptions().addSupport(
461 FeaturesMap: Context.getTargetInfo().getSupportedOpenCLOpts(), Opts: getLangOpts());
462 addImplicitTypedef(Name: "sampler_t", T: Context.OCLSamplerTy);
463 addImplicitTypedef(Name: "event_t", T: Context.OCLEventTy);
464 auto OCLCompatibleVersion = getLangOpts().getOpenCLCompatibleVersion();
465 if (OCLCompatibleVersion >= 200) {
466 if (getLangOpts().OpenCLCPlusPlus || getLangOpts().Blocks) {
467 addImplicitTypedef(Name: "clk_event_t", T: Context.OCLClkEventTy);
468 addImplicitTypedef(Name: "queue_t", T: Context.OCLQueueTy);
469 }
470 if (getLangOpts().OpenCLPipes)
471 addImplicitTypedef(Name: "reserve_id_t", T: Context.OCLReserveIDTy);
472 addImplicitTypedef(Name: "atomic_int", T: Context.getAtomicType(T: Context.IntTy));
473 addImplicitTypedef(Name: "atomic_uint",
474 T: Context.getAtomicType(T: Context.UnsignedIntTy));
475 addImplicitTypedef(Name: "atomic_float",
476 T: Context.getAtomicType(T: Context.FloatTy));
477 // OpenCLC v2.0, s6.13.11.6 requires that atomic_flag is implemented as
478 // 32-bit integer and OpenCLC v2.0, s6.1.1 int is always 32-bit wide.
479 addImplicitTypedef(Name: "atomic_flag", T: Context.getAtomicType(T: Context.IntTy));
480
481
482 // OpenCL v2.0 s6.13.11.6:
483 // - The atomic_long and atomic_ulong types are supported if the
484 // cl_khr_int64_base_atomics and cl_khr_int64_extended_atomics
485 // extensions are supported.
486 // - The atomic_double type is only supported if double precision
487 // is supported and the cl_khr_int64_base_atomics and
488 // cl_khr_int64_extended_atomics extensions are supported.
489 // - If the device address space is 64-bits, the data types
490 // atomic_intptr_t, atomic_uintptr_t, atomic_size_t and
491 // atomic_ptrdiff_t are supported if the cl_khr_int64_base_atomics and
492 // cl_khr_int64_extended_atomics extensions are supported.
493
494 auto AddPointerSizeDependentTypes = [&]() {
495 auto AtomicSizeT = Context.getAtomicType(T: Context.getSizeType());
496 auto AtomicIntPtrT = Context.getAtomicType(T: Context.getIntPtrType());
497 auto AtomicUIntPtrT = Context.getAtomicType(T: Context.getUIntPtrType());
498 auto AtomicPtrDiffT =
499 Context.getAtomicType(T: Context.getPointerDiffType());
500 addImplicitTypedef(Name: "atomic_size_t", T: AtomicSizeT);
501 addImplicitTypedef(Name: "atomic_intptr_t", T: AtomicIntPtrT);
502 addImplicitTypedef(Name: "atomic_uintptr_t", T: AtomicUIntPtrT);
503 addImplicitTypedef(Name: "atomic_ptrdiff_t", T: AtomicPtrDiffT);
504 };
505
506 if (Context.getTypeSize(T: Context.getSizeType()) == 32) {
507 AddPointerSizeDependentTypes();
508 }
509
510 if (getOpenCLOptions().isSupported(Ext: "cl_khr_fp16", LO: getLangOpts())) {
511 auto AtomicHalfT = Context.getAtomicType(T: Context.HalfTy);
512 addImplicitTypedef(Name: "atomic_half", T: AtomicHalfT);
513 }
514
515 std::vector<QualType> Atomic64BitTypes;
516 if (getOpenCLOptions().isSupported(Ext: "cl_khr_int64_base_atomics",
517 LO: getLangOpts()) &&
518 getOpenCLOptions().isSupported(Ext: "cl_khr_int64_extended_atomics",
519 LO: getLangOpts())) {
520 if (getOpenCLOptions().isSupported(Ext: "cl_khr_fp64", LO: getLangOpts())) {
521 auto AtomicDoubleT = Context.getAtomicType(T: Context.DoubleTy);
522 addImplicitTypedef(Name: "atomic_double", T: AtomicDoubleT);
523 Atomic64BitTypes.push_back(x: AtomicDoubleT);
524 }
525 auto AtomicLongT = Context.getAtomicType(T: Context.LongTy);
526 auto AtomicULongT = Context.getAtomicType(T: Context.UnsignedLongTy);
527 addImplicitTypedef(Name: "atomic_long", T: AtomicLongT);
528 addImplicitTypedef(Name: "atomic_ulong", T: AtomicULongT);
529
530
531 if (Context.getTypeSize(T: Context.getSizeType()) == 64) {
532 AddPointerSizeDependentTypes();
533 }
534 }
535 }
536
537#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
538 if (getOpenCLOptions().isSupported(#Ext, getLangOpts())) { \
539 addImplicitTypedef(#ExtType, Context.Id##Ty); \
540 }
541#include "clang/Basic/OpenCLExtensionTypes.def"
542 }
543
544 if (Context.getTargetInfo().hasAArch64ACLETypes() ||
545 (Context.getAuxTargetInfo() &&
546 Context.getAuxTargetInfo()->hasAArch64ACLETypes())) {
547#define SVE_TYPE(Name, Id, SingletonId) \
548 addImplicitTypedef(#Name, Context.SingletonId);
549#define NEON_VECTOR_TYPE(Name, BaseType, ElBits, NumEls, VectorKind) \
550 addImplicitTypedef( \
551 #Name, Context.getVectorType(Context.BaseType, NumEls, VectorKind));
552#include "clang/Basic/AArch64ACLETypes.def"
553 }
554
555 if (Context.getTargetInfo().getTriple().isPPC64()) {
556#define PPC_VECTOR_MMA_TYPE(Name, Id, Size) \
557 addImplicitTypedef(#Name, Context.Id##Ty);
558#include "clang/Basic/PPCTypes.def"
559#define PPC_VECTOR_VSX_TYPE(Name, Id, Size) \
560 addImplicitTypedef(#Name, Context.Id##Ty);
561#include "clang/Basic/PPCTypes.def"
562 }
563
564 if (Context.getTargetInfo().hasRISCVVTypes()) {
565#define RVV_TYPE(Name, Id, SingletonId) \
566 addImplicitTypedef(Name, Context.SingletonId);
567#include "clang/Basic/RISCVVTypes.def"
568 }
569
570 if (Context.getTargetInfo().getTriple().isWasm() &&
571 Context.getTargetInfo().hasFeature(Feature: "reference-types")) {
572#define WASM_TYPE(Name, Id, SingletonId) \
573 addImplicitTypedef(Name, Context.SingletonId);
574#include "clang/Basic/WebAssemblyReferenceTypes.def"
575 }
576
577 if (Context.getTargetInfo().hasAMDGPUTypes() ||
578 (Context.getAuxTargetInfo() &&
579 (Context.getAuxTargetInfo()->hasAMDGPUTypes()))) {
580#define AMDGPU_TYPE(Name, Id, SingletonId, Width, Align) \
581 addImplicitTypedef(Name, Context.SingletonId);
582#include "clang/Basic/AMDGPUTypes.def"
583 }
584
585 if (Context.getTargetInfo().getTriple().isSPIRV() ||
586 (Context.getAuxTargetInfo() &&
587 Context.getAuxTargetInfo()->getTriple().isSPIRV())) {
588#define SPIRV_TYPE(Name, Id, SingletonId) \
589 addImplicitTypedef(Name, Context.SingletonId);
590#include "clang/Basic/SPIRVTypes.def"
591 }
592
593 if (Context.getTargetInfo().hasBuiltinMSVaList()) {
594 DeclarationName MSVaList = &Context.Idents.get(Name: "__builtin_ms_va_list");
595 if (IdResolver.begin(Name: MSVaList) == IdResolver.end())
596 PushOnScopeChains(D: Context.getBuiltinMSVaListDecl(), S: TUScope);
597 }
598
599 if (Context.getTargetInfo().hasBuiltinZOSVaList()) {
600 DeclarationName ZOSVaList = &Context.Idents.get(Name: "__builtin_zos_va_list");
601 if (IdResolver.begin(Name: ZOSVaList) == IdResolver.end())
602 PushOnScopeChains(D: Context.getBuiltinZOSVaListDecl(), S: TUScope);
603 }
604
605 DeclarationName BuiltinVaList = &Context.Idents.get(Name: "__builtin_va_list");
606 if (IdResolver.begin(Name: BuiltinVaList) == IdResolver.end())
607 PushOnScopeChains(D: Context.getBuiltinVaListDecl(), S: TUScope);
608}
609
610Sema::~Sema() {
611 assert(InstantiatingSpecializations.empty() &&
612 "failed to clean up an InstantiatingTemplate?");
613
614 if (VisContext) FreeVisContext();
615
616 // Kill all the active scopes.
617 for (sema::FunctionScopeInfo *FSI : FunctionScopes)
618 delete FSI;
619
620 // Tell the SemaConsumer to forget about us; we're going out of scope.
621 if (SemaConsumer *SC = dyn_cast<SemaConsumer>(Val: &Consumer))
622 SC->ForgetSema();
623
624 // Detach from the external Sema source.
625 if (ExternalSemaSource *ExternalSema
626 = dyn_cast_or_null<ExternalSemaSource>(Val: Context.getExternalSource()))
627 ExternalSema->ForgetSema();
628
629 // Delete cached satisfactions.
630 std::vector<ConstraintSatisfaction *> Satisfactions;
631 Satisfactions.reserve(n: SatisfactionCache.size());
632 for (auto &Node : SatisfactionCache)
633 Satisfactions.push_back(x: &Node);
634 for (auto *Node : Satisfactions)
635 delete Node;
636
637 threadSafety::threadSafetyCleanup(Cache: ThreadSafetyDeclCache);
638
639 // Destroys data sharing attributes stack for OpenMP
640 OpenMP().DestroyDataSharingAttributesStack();
641
642 // Detach from the PP callback handler which outlives Sema since it's owned
643 // by the preprocessor.
644 SemaPPCallbackHandler->reset();
645}
646
647void Sema::runWithSufficientStackSpace(SourceLocation Loc,
648 llvm::function_ref<void()> Fn) {
649 StackHandler.runWithSufficientStackSpace(Loc, Fn);
650}
651
652bool Sema::makeUnavailableInSystemHeader(SourceLocation loc,
653 UnavailableAttr::ImplicitReason reason) {
654 // If we're not in a function, it's an error.
655 FunctionDecl *fn = dyn_cast<FunctionDecl>(Val: CurContext);
656 if (!fn) return false;
657
658 // If we're in template instantiation, it's an error.
659 if (inTemplateInstantiation())
660 return false;
661
662 // If that function's not in a system header, it's an error.
663 if (!Context.getSourceManager().isInSystemHeader(Loc: loc))
664 return false;
665
666 // If the function is already unavailable, it's not an error.
667 if (fn->hasAttr<UnavailableAttr>()) return true;
668
669 fn->addAttr(A: UnavailableAttr::CreateImplicit(Ctx&: Context, Message: "", ImplicitReason: reason, Range: loc));
670 return true;
671}
672
673ASTMutationListener *Sema::getASTMutationListener() const {
674 return getASTConsumer().GetASTMutationListener();
675}
676
677void Sema::addExternalSource(IntrusiveRefCntPtr<ExternalSemaSource> E) {
678 assert(E && "Cannot use with NULL ptr");
679
680 if (!ExternalSource) {
681 ExternalSource = std::move(E);
682 return;
683 }
684
685 if (auto *Ex = dyn_cast<MultiplexExternalSemaSource>(Val: ExternalSource.get()))
686 Ex->AddSource(Source: std::move(E));
687 else
688 ExternalSource = llvm::makeIntrusiveRefCnt<MultiplexExternalSemaSource>(
689 A&: ExternalSource, A: std::move(E));
690}
691
692void Sema::PrintStats() const {
693 llvm::errs() << "\n*** Semantic Analysis Stats:\n";
694 if (SFINAETrap *Trap = getSFINAEContext())
695 llvm::errs() << int(Trap->hasErrorOccurred())
696 << " SFINAE diagnostics trapped.\n";
697
698 BumpAlloc.PrintStats();
699 AnalysisWarnings.PrintStats();
700}
701
702void Sema::diagnoseNullableToNonnullConversion(QualType DstType,
703 QualType SrcType,
704 SourceLocation Loc) {
705 NullabilityKindOrNone ExprNullability = SrcType->getNullability();
706 if (!ExprNullability || (*ExprNullability != NullabilityKind::Nullable &&
707 *ExprNullability != NullabilityKind::NullableResult))
708 return;
709
710 NullabilityKindOrNone TypeNullability = DstType->getNullability();
711 if (!TypeNullability || *TypeNullability != NullabilityKind::NonNull)
712 return;
713
714 Diag(Loc, DiagID: diag::warn_nullability_lost) << SrcType << DstType;
715}
716
717// Generate diagnostics when adding or removing effects in a type conversion.
718void Sema::diagnoseFunctionEffectConversion(QualType DstType, QualType SrcType,
719 SourceLocation Loc) {
720 const auto SrcFX = FunctionEffectsRef::get(QT: SrcType);
721 const auto DstFX = FunctionEffectsRef::get(QT: DstType);
722 if (SrcFX != DstFX) {
723 for (const auto &Diff : FunctionEffectDiffVector(SrcFX, DstFX)) {
724 if (Diff.shouldDiagnoseConversion(SrcType, SrcFX, DstType, DstFX))
725 Diag(Loc, DiagID: diag::warn_invalid_add_func_effects) << Diff.effectName();
726 }
727 }
728}
729
730void Sema::diagnoseZeroToNullptrConversion(CastKind Kind, const Expr *E) {
731 // nullptr only exists from C++11 on, so don't warn on its absence earlier.
732 if (!getLangOpts().CPlusPlus11)
733 return;
734
735 if (Kind != CK_NullToPointer && Kind != CK_NullToMemberPointer)
736 return;
737
738 const Expr *EStripped = E->IgnoreParenImpCasts();
739 if (EStripped->getType()->isNullPtrType())
740 return;
741 if (isa<GNUNullExpr>(Val: EStripped))
742 return;
743
744 if (Diags.isIgnored(DiagID: diag::warn_zero_as_null_pointer_constant,
745 Loc: E->getBeginLoc()))
746 return;
747
748 // Don't diagnose the conversion from a 0 literal to a null pointer argument
749 // in a synthesized call to operator<=>.
750 if (!CodeSynthesisContexts.empty() &&
751 CodeSynthesisContexts.back().Kind ==
752 CodeSynthesisContext::RewritingOperatorAsSpaceship)
753 return;
754
755 // Ignore null pointers in defaulted comparison operators.
756 FunctionDecl *FD = getCurFunctionDecl();
757 if (FD && FD->isDefaulted()) {
758 return;
759 }
760
761 // If it is a macro from system header, and if the macro name is not "NULL",
762 // do not warn.
763 // Note that uses of "NULL" will be ignored above on systems that define it
764 // as __null.
765 SourceLocation MaybeMacroLoc = E->getBeginLoc();
766 if (Diags.getSuppressSystemWarnings() &&
767 SourceMgr.isInSystemMacro(loc: MaybeMacroLoc) &&
768 !findMacroSpelling(loc&: MaybeMacroLoc, name: "NULL"))
769 return;
770
771 Diag(Loc: E->getBeginLoc(), DiagID: diag::warn_zero_as_null_pointer_constant)
772 << FixItHint::CreateReplacement(RemoveRange: E->getSourceRange(), Code: "nullptr");
773}
774
775/// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit cast.
776/// If there is already an implicit cast, merge into the existing one.
777/// The result is of the given category.
778ExprResult Sema::ImpCastExprToType(Expr *E, QualType Ty,
779 CastKind Kind, ExprValueKind VK,
780 const CXXCastPath *BasePath,
781 CheckedConversionKind CCK) {
782#ifndef NDEBUG
783 if (VK == VK_PRValue && !E->isPRValue()) {
784 switch (Kind) {
785 default:
786 llvm_unreachable(
787 ("can't implicitly cast glvalue to prvalue with this cast "
788 "kind: " +
789 std::string(CastExpr::getCastKindName(Kind)))
790 .c_str());
791 case CK_Dependent:
792 case CK_LValueToRValue:
793 case CK_ArrayToPointerDecay:
794 case CK_FunctionToPointerDecay:
795 case CK_ToVoid:
796 case CK_NonAtomicToAtomic:
797 case CK_HLSLArrayRValue:
798 case CK_HLSLAggregateSplatCast:
799 break;
800 }
801 }
802 assert((VK == VK_PRValue || Kind == CK_Dependent || !E->isPRValue()) &&
803 "can't cast prvalue to glvalue");
804#endif
805
806 diagnoseNullableToNonnullConversion(DstType: Ty, SrcType: E->getType(), Loc: E->getBeginLoc());
807 diagnoseZeroToNullptrConversion(Kind, E);
808 if (Context.hasAnyFunctionEffects() && !isCast(CCK) &&
809 Kind != CK_NullToPointer && Kind != CK_NullToMemberPointer)
810 diagnoseFunctionEffectConversion(DstType: Ty, SrcType: E->getType(), Loc: E->getBeginLoc());
811
812 QualType ExprTy = Context.getCanonicalType(T: E->getType());
813 QualType TypeTy = Context.getCanonicalType(T: Ty);
814
815 // This cast is used in place of a regular LValue to RValue cast for
816 // HLSL Array Parameter Types. It needs to be emitted even if
817 // ExprTy == TypeTy, except if E is an HLSLOutArgExpr
818 // Emitting a cast in that case will prevent HLSLOutArgExpr from
819 // being handled properly in EmitCallArg
820 if (Kind == CK_HLSLArrayRValue && !isa<HLSLOutArgExpr>(Val: E))
821 return ImplicitCastExpr::Create(Context, T: Ty, Kind, Operand: E, BasePath, Cat: VK,
822 FPO: CurFPFeatureOverrides());
823
824 if (ExprTy == TypeTy)
825 return E;
826
827 if (Kind == CK_ArrayToPointerDecay) {
828 // C++1z [conv.array]: The temporary materialization conversion is applied.
829 // We also use this to fuel C++ DR1213, which applies to C++11 onwards.
830 if (getLangOpts().CPlusPlus && E->isPRValue()) {
831 // The temporary is an lvalue in C++98 and an xvalue otherwise.
832 ExprResult Materialized = CreateMaterializeTemporaryExpr(
833 T: E->getType(), Temporary: E, BoundToLvalueReference: !getLangOpts().CPlusPlus11);
834 if (Materialized.isInvalid())
835 return ExprError();
836 E = Materialized.get();
837 }
838 // C17 6.7.1p6 footnote 124: The implementation can treat any register
839 // declaration simply as an auto declaration. However, whether or not
840 // addressable storage is actually used, the address of any part of an
841 // object declared with storage-class specifier register cannot be
842 // computed, either explicitly(by use of the unary & operator as discussed
843 // in 6.5.3.2) or implicitly(by converting an array name to a pointer as
844 // discussed in 6.3.2.1).Thus, the only operator that can be applied to an
845 // array declared with storage-class specifier register is sizeof.
846 if (VK == VK_PRValue && !getLangOpts().CPlusPlus && !E->isPRValue()) {
847 if (const auto *DRE = dyn_cast<DeclRefExpr>(Val: E)) {
848 if (const auto *VD = dyn_cast<VarDecl>(Val: DRE->getDecl())) {
849 if (VD->getStorageClass() == SC_Register) {
850 Diag(Loc: E->getExprLoc(), DiagID: diag::err_typecheck_address_of)
851 << /*register variable*/ 3 << E->getSourceRange();
852 return ExprError();
853 }
854 }
855 }
856 }
857 }
858
859 if (ImplicitCastExpr *ImpCast = dyn_cast<ImplicitCastExpr>(Val: E)) {
860 if (ImpCast->getCastKind() == Kind && (!BasePath || BasePath->empty())) {
861 ImpCast->setType(Ty);
862 ImpCast->setValueKind(VK);
863 return E;
864 }
865 }
866
867 bool IsExplicitCast = isa<CStyleCastExpr>(Val: E) || isa<CXXStaticCastExpr>(Val: E) ||
868 isa<CXXFunctionalCastExpr>(Val: E);
869
870 if ((Kind == CK_IntegralCast || Kind == CK_IntegralToBoolean ||
871 (Kind == CK_NoOp && E->getType()->isIntegerType() &&
872 Ty->isIntegerType())) &&
873 IsExplicitCast) {
874 if (const auto *SourceOBT = E->getType()->getAs<OverflowBehaviorType>()) {
875 if (Ty->isIntegerType() && !Ty->isOverflowBehaviorType()) {
876 Ty = Context.getOverflowBehaviorType(Kind: SourceOBT->getBehaviorKind(), Wrapped: Ty);
877 }
878 }
879 }
880
881 return ImplicitCastExpr::Create(Context, T: Ty, Kind, Operand: E, BasePath, Cat: VK,
882 FPO: CurFPFeatureOverrides());
883}
884
885CastKind Sema::ScalarTypeToBooleanCastKind(QualType ScalarTy) {
886 switch (ScalarTy->getScalarTypeKind()) {
887 case Type::STK_Bool: return CK_NoOp;
888 case Type::STK_CPointer: return CK_PointerToBoolean;
889 case Type::STK_BlockPointer: return CK_PointerToBoolean;
890 case Type::STK_ObjCObjectPointer: return CK_PointerToBoolean;
891 case Type::STK_MemberPointer: return CK_MemberPointerToBoolean;
892 case Type::STK_Integral: return CK_IntegralToBoolean;
893 case Type::STK_Floating: return CK_FloatingToBoolean;
894 case Type::STK_IntegralComplex: return CK_IntegralComplexToBoolean;
895 case Type::STK_FloatingComplex: return CK_FloatingComplexToBoolean;
896 case Type::STK_FixedPoint: return CK_FixedPointToBoolean;
897 }
898 llvm_unreachable("unknown scalar type kind");
899}
900
901/// Used to prune the decls of Sema's UnusedFileScopedDecls vector.
902static bool ShouldRemoveFromUnused(Sema *SemaRef, const DeclaratorDecl *D) {
903 if (D->getMostRecentDecl()->isUsed())
904 return true;
905
906 if (D->isExternallyVisible())
907 return true;
908
909 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Val: D)) {
910 // If this is a function template and none of its specializations is used,
911 // we should warn.
912 if (FunctionTemplateDecl *Template = FD->getDescribedFunctionTemplate())
913 for (const auto *Spec : Template->specializations())
914 if (ShouldRemoveFromUnused(SemaRef, D: Spec))
915 return true;
916
917 // UnusedFileScopedDecls stores the first declaration.
918 // The declaration may have become definition so check again.
919 const FunctionDecl *DeclToCheck;
920 if (FD->hasBody(Definition&: DeclToCheck))
921 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(D: DeclToCheck);
922
923 // Later redecls may add new information resulting in not having to warn,
924 // so check again.
925 DeclToCheck = FD->getMostRecentDecl();
926 if (DeclToCheck != FD)
927 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(D: DeclToCheck);
928 }
929
930 if (const VarDecl *VD = dyn_cast<VarDecl>(Val: D)) {
931 // If a variable usable in constant expressions is referenced,
932 // don't warn if it isn't used: if the value of a variable is required
933 // for the computation of a constant expression, it doesn't make sense to
934 // warn even if the variable isn't odr-used. (isReferenced doesn't
935 // precisely reflect that, but it's a decent approximation.)
936 if (VD->isReferenced() &&
937 VD->mightBeUsableInConstantExpressions(C: SemaRef->Context))
938 return true;
939
940 if (VarTemplateDecl *Template = VD->getDescribedVarTemplate())
941 // If this is a variable template and none of its specializations is used,
942 // we should warn.
943 for (const auto *Spec : Template->specializations())
944 if (ShouldRemoveFromUnused(SemaRef, D: Spec))
945 return true;
946
947 // UnusedFileScopedDecls stores the first declaration.
948 // The declaration may have become definition so check again.
949 const VarDecl *DeclToCheck = VD->getDefinition();
950 if (DeclToCheck)
951 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(D: DeclToCheck);
952
953 // Later redecls may add new information resulting in not having to warn,
954 // so check again.
955 DeclToCheck = VD->getMostRecentDecl();
956 if (DeclToCheck != VD)
957 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(D: DeclToCheck);
958 }
959
960 return false;
961}
962
963static bool isFunctionOrVarDeclExternC(const NamedDecl *ND) {
964 if (const auto *FD = dyn_cast<FunctionDecl>(Val: ND))
965 return FD->isExternC();
966 return cast<VarDecl>(Val: ND)->isExternC();
967}
968
969/// Determine whether ND is an external-linkage function or variable whose
970/// type has no linkage.
971bool Sema::isExternalWithNoLinkageType(const ValueDecl *VD) const {
972 // Note: it's not quite enough to check whether VD has UniqueExternalLinkage,
973 // because we also want to catch the case where its type has VisibleNoLinkage,
974 // which does not affect the linkage of VD.
975 return getLangOpts().CPlusPlus && VD->hasExternalFormalLinkage() &&
976 !isExternalFormalLinkage(L: VD->getType()->getLinkage()) &&
977 !isFunctionOrVarDeclExternC(ND: VD);
978}
979
980bool Sema::isMainFileLoc(SourceLocation Loc) const {
981 if (TUKind != TU_Complete || getLangOpts().IsHeaderFile)
982 return false;
983 return SourceMgr.isInMainFile(Loc);
984}
985
986/// Obtains a sorted list of functions and variables that are undefined but
987/// ODR-used.
988void Sema::getUndefinedButUsed(
989 SmallVectorImpl<std::pair<NamedDecl *, SourceLocation> > &Undefined) {
990 for (const auto &UndefinedUse : UndefinedButUsed) {
991 NamedDecl *ND = UndefinedUse.first;
992
993 // Ignore attributes that have become invalid.
994 if (ND->isInvalidDecl()) continue;
995
996 // __attribute__((weakref)) is basically a definition.
997 if (ND->hasAttr<WeakRefAttr>()) continue;
998
999 if (isa<CXXDeductionGuideDecl>(Val: ND))
1000 continue;
1001
1002 if (ND->hasAttr<DLLImportAttr>() || ND->hasAttr<DLLExportAttr>()) {
1003 // An exported function will always be emitted when defined, so even if
1004 // the function is inline, it doesn't have to be emitted in this TU. An
1005 // imported function implies that it has been exported somewhere else.
1006 continue;
1007 }
1008
1009 if (const auto *FD = dyn_cast<FunctionDecl>(Val: ND)) {
1010 if (FD->isDefined())
1011 continue;
1012 if (FD->isExternallyVisible() &&
1013 !isExternalWithNoLinkageType(VD: FD) &&
1014 !FD->getMostRecentDecl()->isInlined() &&
1015 !FD->hasAttr<ExcludeFromExplicitInstantiationAttr>())
1016 continue;
1017 if (FD->getBuiltinID())
1018 continue;
1019 } else {
1020 const auto *VD = cast<VarDecl>(Val: ND);
1021 if (VD->hasDefinition() != VarDecl::DeclarationOnly)
1022 continue;
1023 if (VD->isExternallyVisible() &&
1024 !isExternalWithNoLinkageType(VD) &&
1025 !VD->getMostRecentDecl()->isInline() &&
1026 !VD->hasAttr<ExcludeFromExplicitInstantiationAttr>())
1027 continue;
1028
1029 // Skip VarDecls that lack formal definitions but which we know are in
1030 // fact defined somewhere.
1031 if (VD->isKnownToBeDefined())
1032 continue;
1033 }
1034
1035 Undefined.push_back(Elt: std::make_pair(x&: ND, y: UndefinedUse.second));
1036 }
1037}
1038
1039/// checkUndefinedButUsed - Check for undefined objects with internal linkage
1040/// or that are inline.
1041static void checkUndefinedButUsed(Sema &S) {
1042 if (S.UndefinedButUsed.empty()) return;
1043
1044 // Collect all the still-undefined entities with internal linkage.
1045 SmallVector<std::pair<NamedDecl *, SourceLocation>, 16> Undefined;
1046 S.getUndefinedButUsed(Undefined);
1047 S.UndefinedButUsed.clear();
1048 if (Undefined.empty()) return;
1049
1050 for (const auto &Undef : Undefined) {
1051 ValueDecl *VD = cast<ValueDecl>(Val: Undef.first);
1052 SourceLocation UseLoc = Undef.second;
1053
1054 if (S.isExternalWithNoLinkageType(VD)) {
1055 // C++ [basic.link]p8:
1056 // A type without linkage shall not be used as the type of a variable
1057 // or function with external linkage unless
1058 // -- the entity has C language linkage
1059 // -- the entity is not odr-used or is defined in the same TU
1060 //
1061 // As an extension, accept this in cases where the type is externally
1062 // visible, since the function or variable actually can be defined in
1063 // another translation unit in that case.
1064 S.Diag(Loc: VD->getLocation(), DiagID: isExternallyVisible(L: VD->getType()->getLinkage())
1065 ? diag::ext_undefined_internal_type
1066 : diag::err_undefined_internal_type)
1067 << isa<VarDecl>(Val: VD) << VD;
1068 } else if (!VD->isExternallyVisible()) {
1069 // FIXME: We can promote this to an error. The function or variable can't
1070 // be defined anywhere else, so the program must necessarily violate the
1071 // one definition rule.
1072 bool IsImplicitBase = false;
1073 if (const auto *BaseD = dyn_cast<FunctionDecl>(Val: VD)) {
1074 auto *DVAttr = BaseD->getAttr<OMPDeclareVariantAttr>();
1075 if (DVAttr && !DVAttr->getTraitInfo().isExtensionActive(
1076 TP: llvm::omp::TraitProperty::
1077 implementation_extension_disable_implicit_base)) {
1078 const auto *Func = cast<FunctionDecl>(
1079 Val: cast<DeclRefExpr>(Val: DVAttr->getVariantFuncRef())->getDecl());
1080 IsImplicitBase = BaseD->isImplicit() &&
1081 Func->getIdentifier()->isMangledOpenMPVariantName();
1082 }
1083 }
1084 if (!S.getLangOpts().OpenMP || !IsImplicitBase)
1085 S.Diag(Loc: VD->getLocation(), DiagID: diag::warn_undefined_internal)
1086 << isa<VarDecl>(Val: VD) << VD;
1087 } else if (auto *FD = dyn_cast<FunctionDecl>(Val: VD)) {
1088 (void)FD;
1089 assert(FD->getMostRecentDecl()->isInlined() &&
1090 "used object requires definition but isn't inline or internal?");
1091 // FIXME: This is ill-formed; we should reject.
1092 S.Diag(Loc: VD->getLocation(), DiagID: diag::warn_undefined_inline) << VD;
1093 } else {
1094 assert(cast<VarDecl>(VD)->getMostRecentDecl()->isInline() &&
1095 "used var requires definition but isn't inline or internal?");
1096 S.Diag(Loc: VD->getLocation(), DiagID: diag::err_undefined_inline_var) << VD;
1097 }
1098 if (UseLoc.isValid())
1099 S.Diag(Loc: UseLoc, DiagID: diag::note_used_here);
1100 }
1101}
1102
1103void Sema::LoadExternalWeakUndeclaredIdentifiers() {
1104 if (!ExternalSource)
1105 return;
1106
1107 SmallVector<std::pair<IdentifierInfo *, WeakInfo>, 4> WeakIDs;
1108 ExternalSource->ReadWeakUndeclaredIdentifiers(WI&: WeakIDs);
1109 for (auto &WeakID : WeakIDs)
1110 (void)WeakUndeclaredIdentifiers[WeakID.first].insert(X: WeakID.second);
1111}
1112
1113void Sema::LoadExternalExtnameUndeclaredIdentifiers() {
1114 if (!ExternalSource)
1115 return;
1116
1117 SmallVector<std::pair<IdentifierInfo *, AsmLabelAttr *>, 4> ExtnameIDs;
1118 ExternalSource->ReadExtnameUndeclaredIdentifiers(EI&: ExtnameIDs);
1119 for (auto &ExtnameID : ExtnameIDs)
1120 ExtnameUndeclaredIdentifiers[ExtnameID.first] = ExtnameID.second;
1121}
1122
1123typedef llvm::DenseMap<const CXXRecordDecl*, bool> RecordCompleteMap;
1124
1125/// Returns true, if all methods and nested classes of the given
1126/// CXXRecordDecl are defined in this translation unit.
1127///
1128/// Should only be called from ActOnEndOfTranslationUnit so that all
1129/// definitions are actually read.
1130static bool MethodsAndNestedClassesComplete(const CXXRecordDecl *RD,
1131 RecordCompleteMap &MNCComplete) {
1132 RecordCompleteMap::iterator Cache = MNCComplete.find(Val: RD);
1133 if (Cache != MNCComplete.end())
1134 return Cache->second;
1135 if (!RD->isCompleteDefinition())
1136 return false;
1137 bool Complete = true;
1138 for (DeclContext::decl_iterator I = RD->decls_begin(),
1139 E = RD->decls_end();
1140 I != E && Complete; ++I) {
1141 if (const CXXMethodDecl *M = dyn_cast<CXXMethodDecl>(Val: *I))
1142 Complete = M->isDefined() || M->isDefaulted() ||
1143 (M->isPureVirtual() && !isa<CXXDestructorDecl>(Val: M));
1144 else if (const FunctionTemplateDecl *F = dyn_cast<FunctionTemplateDecl>(Val: *I))
1145 // If the template function is marked as late template parsed at this
1146 // point, it has not been instantiated and therefore we have not
1147 // performed semantic analysis on it yet, so we cannot know if the type
1148 // can be considered complete.
1149 Complete = !F->getTemplatedDecl()->isLateTemplateParsed() &&
1150 F->getTemplatedDecl()->isDefined();
1151 else if (const CXXRecordDecl *R = dyn_cast<CXXRecordDecl>(Val: *I)) {
1152 if (R->isInjectedClassName())
1153 continue;
1154 if (R->hasDefinition())
1155 Complete = MethodsAndNestedClassesComplete(RD: R->getDefinition(),
1156 MNCComplete);
1157 else
1158 Complete = false;
1159 }
1160 }
1161 MNCComplete[RD] = Complete;
1162 return Complete;
1163}
1164
1165/// Returns true, if the given CXXRecordDecl is fully defined in this
1166/// translation unit, i.e. all methods are defined or pure virtual and all
1167/// friends, friend functions and nested classes are fully defined in this
1168/// translation unit.
1169///
1170/// Should only be called from ActOnEndOfTranslationUnit so that all
1171/// definitions are actually read.
1172static bool IsRecordFullyDefined(const CXXRecordDecl *RD,
1173 RecordCompleteMap &RecordsComplete,
1174 RecordCompleteMap &MNCComplete) {
1175 RecordCompleteMap::iterator Cache = RecordsComplete.find(Val: RD);
1176 if (Cache != RecordsComplete.end())
1177 return Cache->second;
1178 bool Complete = MethodsAndNestedClassesComplete(RD, MNCComplete);
1179 for (CXXRecordDecl::friend_iterator I = RD->friend_begin(),
1180 E = RD->friend_end();
1181 I != E && Complete; ++I) {
1182 FriendDecl *Friend = *I;
1183 // Check if friend classes and methods are complete.
1184 if (TypeSourceInfo *TSI = Friend->getFriendType()) {
1185 // Friend classes are available as the TypeSourceInfo of the FriendDecl.
1186 if (CXXRecordDecl *FriendD = TSI->getType()->getAsCXXRecordDecl())
1187 Complete = MethodsAndNestedClassesComplete(RD: FriendD, MNCComplete);
1188 else
1189 Complete = false;
1190 } else {
1191 // Friend functions are available through the NamedDecl of FriendDecl.
1192 if (const FunctionDecl *FD =
1193 dyn_cast<FunctionDecl>(Val: Friend->getFriendDecl()))
1194 Complete = FD->isDefined();
1195 else
1196 // This is a template friend, give up.
1197 Complete = false;
1198 }
1199 }
1200 RecordsComplete[RD] = Complete;
1201 return Complete;
1202}
1203
1204void Sema::getSortedUnusedLocalTypedefNameCandidates(
1205 SmallVectorImpl<const TypedefNameDecl *> &Sorted) const {
1206 // The candidates are collected while iterating a Scope's SmallPtrSet, so sort
1207 // by source location for a deterministic order.
1208 Sorted.assign(in_start: UnusedLocalTypedefNameCandidates.begin(),
1209 in_end: UnusedLocalTypedefNameCandidates.end());
1210 llvm::sort(C&: Sorted,
1211 Comp: [](const TypedefNameDecl *LHS, const TypedefNameDecl *RHS) {
1212 return LHS->getLocation().getRawEncoding() <
1213 RHS->getLocation().getRawEncoding();
1214 });
1215}
1216
1217void Sema::emitAndClearUnusedLocalTypedefWarnings() {
1218 if (ExternalSource)
1219 ExternalSource->ReadUnusedLocalTypedefNameCandidates(
1220 Decls&: UnusedLocalTypedefNameCandidates);
1221 SmallVector<const TypedefNameDecl *, 4> Sorted;
1222 getSortedUnusedLocalTypedefNameCandidates(Sorted);
1223 for (const TypedefNameDecl *TD : Sorted) {
1224 if (TD->isReferenced())
1225 continue;
1226 Diag(Loc: TD->getLocation(), DiagID: diag::warn_unused_local_typedef)
1227 << isa<TypeAliasDecl>(Val: TD) << TD->getDeclName();
1228 }
1229 UnusedLocalTypedefNameCandidates.clear();
1230}
1231
1232void Sema::ActOnStartOfTranslationUnit() {
1233 if (getLangOpts().CPlusPlusModules &&
1234 getLangOpts().getCompilingModule() == LangOptions::CMK_HeaderUnit)
1235 HandleStartOfHeaderUnit();
1236}
1237
1238void Sema::ActOnEndOfTranslationUnitFragment(TUFragmentKind Kind) {
1239 if (Kind == TUFragmentKind::Global) {
1240 // Perform Pending Instantiations at the end of global module fragment so
1241 // that the module ownership of TU-level decls won't get messed.
1242 llvm::TimeTraceScope TimeScope("PerformPendingInstantiations");
1243 PerformPendingInstantiations();
1244 return;
1245 }
1246
1247 // Transfer late parsed template instantiations over to the pending template
1248 // instantiation list. During normal compilation, the late template parser
1249 // will be installed and instantiating these templates will succeed.
1250 //
1251 // If we are building a TU prefix for serialization, it is also safe to
1252 // transfer these over, even though they are not parsed. The end of the TU
1253 // should be outside of any eager template instantiation scope, so when this
1254 // AST is deserialized, these templates will not be parsed until the end of
1255 // the combined TU.
1256 PendingInstantiations.insert(position: PendingInstantiations.end(),
1257 first: LateParsedInstantiations.begin(),
1258 last: LateParsedInstantiations.end());
1259 LateParsedInstantiations.clear();
1260
1261 // If DefinedUsedVTables ends up marking any virtual member functions it
1262 // might lead to more pending template instantiations, which we then need
1263 // to instantiate.
1264 DefineUsedVTables();
1265
1266 // C++: Perform implicit template instantiations.
1267 //
1268 // FIXME: When we perform these implicit instantiations, we do not
1269 // carefully keep track of the point of instantiation (C++ [temp.point]).
1270 // This means that name lookup that occurs within the template
1271 // instantiation will always happen at the end of the translation unit,
1272 // so it will find some names that are not required to be found. This is
1273 // valid, but we could do better by diagnosing if an instantiation uses a
1274 // name that was not visible at its first point of instantiation.
1275 if (ExternalSource) {
1276 // Load pending instantiations from the external source.
1277 SmallVector<PendingImplicitInstantiation, 4> Pending;
1278 ExternalSource->ReadPendingInstantiations(Pending);
1279 for (auto PII : Pending)
1280 if (auto Func = dyn_cast<FunctionDecl>(Val: PII.first))
1281 Func->setInstantiationIsPending(true);
1282 PendingInstantiations.insert(position: PendingInstantiations.begin(),
1283 first: Pending.begin(), last: Pending.end());
1284 }
1285
1286 {
1287 llvm::TimeTraceScope TimeScope("PerformPendingInstantiations");
1288 PerformPendingInstantiations();
1289 }
1290
1291 emitDeferredDiags();
1292
1293 assert(LateParsedInstantiations.empty() &&
1294 "end of TU template instantiation should not create more "
1295 "late-parsed templates");
1296}
1297
1298void Sema::ActOnEndOfTranslationUnit() {
1299 assert(DelayedDiagnostics.getCurrentPool() == nullptr
1300 && "reached end of translation unit with a pool attached?");
1301
1302 // If code completion is enabled, don't perform any end-of-translation-unit
1303 // work.
1304 if (PP.isCodeCompletionEnabled())
1305 return;
1306
1307 // Complete translation units and modules define vtables and perform implicit
1308 // instantiations. PCH files do not.
1309 if (TUKind != TU_Prefix) {
1310 ObjC().DiagnoseUseOfUnimplementedSelectors();
1311
1312 ActOnEndOfTranslationUnitFragment(
1313 Kind: !ModuleScopes.empty() && ModuleScopes.back().Module->Kind ==
1314 Module::PrivateModuleFragment
1315 ? TUFragmentKind::Private
1316 : TUFragmentKind::Normal);
1317
1318 CheckDelayedMemberExceptionSpecs();
1319 } else {
1320 // If we are building a TU prefix for serialization, it is safe to transfer
1321 // these over, even though they are not parsed. The end of the TU should be
1322 // outside of any eager template instantiation scope, so when this AST is
1323 // deserialized, these templates will not be parsed until the end of the
1324 // combined TU.
1325 PendingInstantiations.insert(position: PendingInstantiations.end(),
1326 first: LateParsedInstantiations.begin(),
1327 last: LateParsedInstantiations.end());
1328 LateParsedInstantiations.clear();
1329
1330 if (LangOpts.PCHInstantiateTemplates) {
1331 llvm::TimeTraceScope TimeScope("PerformPendingInstantiations");
1332 PerformPendingInstantiations();
1333 }
1334 }
1335
1336 DiagnoseUnterminatedPragmaAlignPack();
1337 DiagnoseUnterminatedPragmaAttribute();
1338 OpenMP().DiagnoseUnterminatedOpenMPDeclareTarget();
1339 DiagnosePrecisionLossInComplexDivision();
1340 DiagnoseUnusedAPINotesSelectors();
1341
1342 // All delayed member exception specs should be checked or we end up accepting
1343 // incompatible declarations.
1344 assert(DelayedOverridingExceptionSpecChecks.empty());
1345 assert(DelayedEquivalentExceptionSpecChecks.empty());
1346
1347 // All dllexport classes should have been processed already.
1348 assert(DelayedDllExportClasses.empty());
1349 assert(DelayedDllExportMemberFunctions.empty());
1350
1351 // Remove file scoped decls that turned out to be used.
1352 UnusedFileScopedDecls.erase(
1353 From: std::remove_if(first: UnusedFileScopedDecls.begin(source: nullptr, LocalOnly: true),
1354 last: UnusedFileScopedDecls.end(),
1355 pred: [this](const DeclaratorDecl *DD) {
1356 return ShouldRemoveFromUnused(SemaRef: this, D: DD);
1357 }),
1358 To: UnusedFileScopedDecls.end());
1359
1360 if (TUKind == TU_Prefix) {
1361 // Translation unit prefixes don't need any of the checking below.
1362 if (!PP.isIncrementalProcessingEnabled())
1363 TUScope = nullptr;
1364 return;
1365 }
1366
1367 // Check for #pragma weak identifiers that were never declared
1368 LoadExternalWeakUndeclaredIdentifiers();
1369 for (const auto &WeakIDs : WeakUndeclaredIdentifiers) {
1370 if (WeakIDs.second.empty())
1371 continue;
1372
1373 Decl *PrevDecl = LookupSingleName(S: TUScope, Name: WeakIDs.first, Loc: SourceLocation(),
1374 NameKind: LookupOrdinaryName);
1375 if (PrevDecl != nullptr &&
1376 !(isa<FunctionDecl>(Val: PrevDecl) || isa<VarDecl>(Val: PrevDecl)))
1377 for (const auto &WI : WeakIDs.second)
1378 Diag(Loc: WI.getLocation(), DiagID: diag::warn_attribute_wrong_decl_type)
1379 << "'weak'" << /*isRegularKeyword=*/0 << ExpectedVariableOrFunction;
1380 else
1381 for (const auto &WI : WeakIDs.second)
1382 Diag(Loc: WI.getLocation(), DiagID: diag::warn_weak_identifier_undeclared)
1383 << WeakIDs.first;
1384 }
1385
1386 if (LangOpts.CPlusPlus11 &&
1387 !Diags.isIgnored(DiagID: diag::warn_delegating_ctor_cycle, Loc: SourceLocation()))
1388 CheckDelegatingCtorCycles();
1389
1390 if (!Diags.hasErrorOccurred()) {
1391 if (ExternalSource)
1392 ExternalSource->ReadUndefinedButUsed(Undefined&: UndefinedButUsed);
1393 checkUndefinedButUsed(S&: *this);
1394 }
1395
1396 // A global-module-fragment is only permitted within a module unit.
1397 if (!ModuleScopes.empty() && ModuleScopes.back().Module->Kind ==
1398 Module::ExplicitGlobalModuleFragment) {
1399 Diag(Loc: ModuleScopes.back().BeginLoc,
1400 DiagID: diag::err_module_declaration_missing_after_global_module_introducer);
1401 } else if (getLangOpts().getCompilingModule() ==
1402 LangOptions::CMK_ModuleInterface &&
1403 // We can't use ModuleScopes here since ModuleScopes is always
1404 // empty if we're compiling the BMI.
1405 !getASTContext().getCurrentNamedModule()) {
1406 // If we are building a module interface unit, we should have seen the
1407 // module declaration.
1408 //
1409 // FIXME: Make a better guess as to where to put the module declaration.
1410 Diag(Loc: getSourceManager().getLocForStartOfFile(
1411 FID: getSourceManager().getMainFileID()),
1412 DiagID: diag::err_module_declaration_missing);
1413 }
1414
1415 // Now we can decide whether the modules we're building need an initializer.
1416 if (Module *CurrentModule = getCurrentModule();
1417 CurrentModule && CurrentModule->isInterfaceOrPartition()) {
1418 auto DoesModNeedInit = [this](Module *M) {
1419 for (Decl *D : getASTContext().getModuleInitializers(M)) {
1420 auto *VD = dyn_cast<VarDecl>(Val: D);
1421 // TLS initialization is not handled by the TU's global initializer.
1422 if (!VD || VD->getTLSKind() != VarDecl::TLS_None)
1423 continue;
1424
1425 if (const VarDecl *InitDecl = VD->getInitializingDeclaration();
1426 (InitDecl && !InitDecl->hasConstantInitialization()) ||
1427 VD->needsDestruction(Ctx: getASTContext()) ==
1428 QualType::DK_cxx_destructor)
1429 return true;
1430 }
1431 for (auto [Exported, _] : M->Exports)
1432 if (Exported->isNamedModuleInterfaceHasInit())
1433 return true;
1434 for (Module *I : M->Imports)
1435 if (I->isNamedModuleInterfaceHasInit())
1436 return true;
1437
1438 return false;
1439 };
1440
1441 CurrentModule->NamedModuleHasInit =
1442 DoesModNeedInit(CurrentModule) ||
1443 llvm::any_of(Range: CurrentModule->submodules(), P: DoesModNeedInit);
1444 }
1445
1446 if (TUKind == TU_ClangModule) {
1447 // If we are building a module, resolve all of the exported declarations
1448 // now.
1449 if (Module *CurrentModule = PP.getCurrentModule()) {
1450 ModuleMap &ModMap = PP.getHeaderSearchInfo().getModuleMap();
1451
1452 SmallVector<Module *, 2> Stack;
1453 Stack.push_back(Elt: CurrentModule);
1454 while (!Stack.empty()) {
1455 Module *Mod = Stack.pop_back_val();
1456
1457 // Resolve the exported declarations and conflicts.
1458 // FIXME: Actually complain, once we figure out how to teach the
1459 // diagnostic client to deal with complaints in the module map at this
1460 // point.
1461 ModMap.resolveExports(Mod, /*Complain=*/false);
1462 ModMap.resolveUses(Mod, /*Complain=*/false);
1463 ModMap.resolveConflicts(Mod, /*Complain=*/false);
1464
1465 // Queue the submodules, so their exports will also be resolved.
1466 auto SubmodulesRange = Mod->submodules();
1467 Stack.append(in_start: SubmodulesRange.begin(), in_end: SubmodulesRange.end());
1468 }
1469 }
1470
1471 // Warnings emitted in ActOnEndOfTranslationUnit() should be emitted for
1472 // modules when they are built, not every time they are used.
1473 emitAndClearUnusedLocalTypedefWarnings();
1474 }
1475
1476 // C++ standard modules. Diagnose cases where a function is declared inline
1477 // in the module purview but has no definition before the end of the TU or
1478 // the start of a Private Module Fragment (if one is present).
1479 if (!PendingInlineFuncDecls.empty()) {
1480 for (auto *FD : PendingInlineFuncDecls) {
1481 bool DefInPMF = false;
1482 if (auto *FDD = FD->getDefinition()) {
1483 DefInPMF = FDD->getOwningModule()->isPrivateModule();
1484 if (!DefInPMF)
1485 continue;
1486 }
1487 Diag(Loc: FD->getLocation(), DiagID: diag::err_export_inline_not_defined) << DefInPMF;
1488 // If we have a PMF it should be at the end of the ModuleScopes.
1489 if (DefInPMF &&
1490 ModuleScopes.back().Module->Kind == Module::PrivateModuleFragment) {
1491 Diag(Loc: ModuleScopes.back().BeginLoc, DiagID: diag::note_private_module_fragment);
1492 }
1493 }
1494 PendingInlineFuncDecls.clear();
1495 }
1496
1497 // C99 6.9.2p2:
1498 // A declaration of an identifier for an object that has file
1499 // scope without an initializer, and without a storage-class
1500 // specifier or with the storage-class specifier static,
1501 // constitutes a tentative definition. If a translation unit
1502 // contains one or more tentative definitions for an identifier,
1503 // and the translation unit contains no external definition for
1504 // that identifier, then the behavior is exactly as if the
1505 // translation unit contains a file scope declaration of that
1506 // identifier, with the composite type as of the end of the
1507 // translation unit, with an initializer equal to 0.
1508 llvm::SmallPtrSet<VarDecl *, 32> Seen;
1509 for (TentativeDefinitionsType::iterator
1510 T = TentativeDefinitions.begin(source: ExternalSource.get()),
1511 TEnd = TentativeDefinitions.end();
1512 T != TEnd; ++T) {
1513 VarDecl *VD = (*T)->getActingDefinition();
1514
1515 // If the tentative definition was completed, getActingDefinition() returns
1516 // null. If we've already seen this variable before, insert()'s second
1517 // return value is false.
1518 if (!VD || VD->isInvalidDecl() || !Seen.insert(Ptr: VD).second)
1519 continue;
1520
1521 if (const IncompleteArrayType *ArrayT
1522 = Context.getAsIncompleteArrayType(T: VD->getType())) {
1523 // Set the length of the array to 1 (C99 6.9.2p5).
1524 Diag(Loc: VD->getLocation(), DiagID: diag::warn_tentative_incomplete_array);
1525 llvm::APInt One(Context.getTypeSize(T: Context.getSizeType()), true);
1526 QualType T = Context.getConstantArrayType(
1527 EltTy: ArrayT->getElementType(), ArySize: One, SizeExpr: nullptr, ASM: ArraySizeModifier::Normal, IndexTypeQuals: 0);
1528 VD->setType(T);
1529 } else if (RequireCompleteType(Loc: VD->getLocation(), T: VD->getType(),
1530 DiagID: diag::err_tentative_def_incomplete_type))
1531 VD->setInvalidDecl();
1532
1533 // No initialization is performed for a tentative definition.
1534 CheckCompleteVariableDeclaration(VD);
1535
1536 // In C, if the definition is const-qualified and has no initializer, it
1537 // is left uninitialized unless it has static or thread storage duration.
1538 QualType Type = VD->getType();
1539 if (!VD->isInvalidDecl() && !getLangOpts().CPlusPlus &&
1540 Type.isConstQualified() && !VD->getAnyInitializer()) {
1541 unsigned DiagID = diag::warn_default_init_const_unsafe;
1542 if (VD->getStorageDuration() == SD_Static ||
1543 VD->getStorageDuration() == SD_Thread)
1544 DiagID = diag::warn_default_init_const;
1545
1546 bool EmitCppCompat = !Diags.isIgnored(
1547 DiagID: diag::warn_cxx_compat_hack_fake_diagnostic_do_not_emit,
1548 Loc: VD->getLocation());
1549
1550 Diag(Loc: VD->getLocation(), DiagID) << Type << EmitCppCompat;
1551 }
1552
1553 // Notify the consumer that we've completed a tentative definition.
1554 if (!VD->isInvalidDecl())
1555 Consumer.CompleteTentativeDefinition(D: VD);
1556 }
1557
1558 // In incremental mode, tentative definitions belong to the current
1559 // partial translation unit (PTU). Once they have been completed and
1560 // emitted to codegen, drop them to prevent re-emission in future PTUs.
1561 if (PP.isIncrementalProcessingEnabled())
1562 TentativeDefinitions.erase(From: TentativeDefinitions.begin(source: ExternalSource.get()),
1563 To: TentativeDefinitions.end());
1564
1565 for (auto *D : ExternalDeclarations) {
1566 if (!D || D->isInvalidDecl() || D->getPreviousDecl() || !D->isUsed())
1567 continue;
1568
1569 Consumer.CompleteExternalDeclaration(D);
1570 }
1571
1572 // Visit all pending #pragma export.
1573 for (const PendingPragmaInfo &Exported : PendingExportedNames.values()) {
1574 if (!Exported.Used)
1575 Diag(Loc: Exported.NameLoc, DiagID: diag::warn_failed_to_resolve_pragma) << "export";
1576 }
1577
1578 if (LangOpts.HLSL)
1579 HLSL().ActOnEndOfTranslationUnit(TU: getASTContext().getTranslationUnitDecl());
1580 if (LangOpts.OpenACC)
1581 OpenACC().ActOnEndOfTranslationUnit(
1582 TU: getASTContext().getTranslationUnitDecl());
1583
1584 // If there were errors, disable 'unused' warnings since they will mostly be
1585 // noise. Don't warn for a use from a module: either we should warn on all
1586 // file-scope declarations in modules or not at all, but whether the
1587 // declaration is used is immaterial.
1588 if (!Diags.hasErrorOccurred() && TUKind != TU_ClangModule) {
1589 // Output warning for unused file scoped decls.
1590 for (UnusedFileScopedDeclsType::iterator
1591 I = UnusedFileScopedDecls.begin(source: ExternalSource.get()),
1592 E = UnusedFileScopedDecls.end();
1593 I != E; ++I) {
1594 if (ShouldRemoveFromUnused(SemaRef: this, D: *I))
1595 continue;
1596
1597 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Val: *I)) {
1598 const FunctionDecl *DiagD;
1599 if (!FD->hasBody(Definition&: DiagD))
1600 DiagD = FD;
1601 if (DiagD->isDeleted())
1602 continue; // Deleted functions are supposed to be unused.
1603 SourceRange DiagRange = DiagD->getLocation();
1604 if (const ASTTemplateArgumentListInfo *ASTTAL =
1605 DiagD->getTemplateSpecializationArgsAsWritten())
1606 DiagRange.setEnd(ASTTAL->RAngleLoc);
1607 if (DiagD->isReferenced()) {
1608 if (isa<CXXMethodDecl>(Val: DiagD))
1609 Diag(Loc: DiagD->getLocation(), DiagID: diag::warn_unneeded_member_function)
1610 << DiagD << DiagRange;
1611 else {
1612 if (FD->getStorageClass() == SC_Static &&
1613 !FD->isInlineSpecified() &&
1614 !SourceMgr.isInMainFile(
1615 Loc: SourceMgr.getExpansionLoc(Loc: FD->getLocation())))
1616 Diag(Loc: DiagD->getLocation(),
1617 DiagID: diag::warn_unneeded_static_internal_decl)
1618 << DiagD << DiagRange;
1619 else
1620 Diag(Loc: DiagD->getLocation(), DiagID: diag::warn_unneeded_internal_decl)
1621 << /*function=*/0 << DiagD << DiagRange;
1622 }
1623 } else if (!FD->isTargetMultiVersion() ||
1624 FD->isTargetMultiVersionDefault()) {
1625 if (FD->getDescribedFunctionTemplate())
1626 Diag(Loc: DiagD->getLocation(), DiagID: diag::warn_unused_template)
1627 << /*function=*/0 << DiagD << DiagRange;
1628 else
1629 Diag(Loc: DiagD->getLocation(), DiagID: isa<CXXMethodDecl>(Val: DiagD)
1630 ? diag::warn_unused_member_function
1631 : diag::warn_unused_function)
1632 << DiagD << DiagRange;
1633 }
1634 } else {
1635 const VarDecl *DiagD = cast<VarDecl>(Val: *I)->getDefinition();
1636 if (!DiagD)
1637 DiagD = cast<VarDecl>(Val: *I);
1638 SourceRange DiagRange = DiagD->getLocation();
1639 if (const auto *VTSD = dyn_cast<VarTemplateSpecializationDecl>(Val: DiagD)) {
1640 if (const ASTTemplateArgumentListInfo *ASTTAL =
1641 VTSD->getTemplateArgsAsWritten())
1642 DiagRange.setEnd(ASTTAL->RAngleLoc);
1643 }
1644 if (DiagD->isReferenced()) {
1645 Diag(Loc: DiagD->getLocation(), DiagID: diag::warn_unneeded_internal_decl)
1646 << /*variable=*/1 << DiagD << DiagRange;
1647 } else if (DiagD->getDescribedVarTemplate()) {
1648 Diag(Loc: DiagD->getLocation(), DiagID: diag::warn_unused_template)
1649 << /*variable=*/1 << DiagD << DiagRange;
1650 } else if (DiagD->getType().isConstQualified()) {
1651 const SourceManager &SM = SourceMgr;
1652 if (SM.getMainFileID() != SM.getFileID(SpellingLoc: DiagD->getLocation()) ||
1653 !PP.getLangOpts().IsHeaderFile)
1654 Diag(Loc: DiagD->getLocation(), DiagID: diag::warn_unused_const_variable)
1655 << DiagD << DiagRange;
1656 } else {
1657 Diag(Loc: DiagD->getLocation(), DiagID: diag::warn_unused_variable)
1658 << DiagD << DiagRange;
1659 }
1660 }
1661 }
1662
1663 emitAndClearUnusedLocalTypedefWarnings();
1664 }
1665
1666 if (!Diags.isIgnored(DiagID: diag::warn_unused_but_set_global, Loc: SourceLocation())) {
1667 // Diagnose unused-but-set static globals in a deterministic order.
1668 // Not tracking shadowing info for static globals; there's nothing to
1669 // shadow.
1670 struct LocAndDiag {
1671 SourceLocation Loc;
1672 PartialDiagnostic PD;
1673 };
1674 SmallVector<LocAndDiag, 16> DeclDiags;
1675 auto addDiag = [&DeclDiags](SourceLocation Loc, PartialDiagnostic PD) {
1676 DeclDiags.push_back(Elt: LocAndDiag{.Loc: Loc, .PD: std::move(PD)});
1677 };
1678
1679 // For -Wunused-but-set-variable we only care about variables that were
1680 // referenced by the TU end.
1681 for (const auto &Ref : RefsMinusAssignments) {
1682 const VarDecl *VD = Ref.first;
1683 // Only diagnose internal linkage file vars defined in the main file to
1684 // match -Wunused-variable behavior and avoid false positives from
1685 // headers.
1686 if (VD->isInternalLinkageFileVar() && isMainFileLoc(Loc: VD->getLocation()))
1687 DiagnoseUnusedButSetDecl(VD, DiagReceiver: addDiag);
1688 }
1689
1690 llvm::sort(C&: DeclDiags,
1691 Comp: [](const LocAndDiag &LHS, const LocAndDiag &RHS) -> bool {
1692 // Sorting purely for determinism; matches behavior in
1693 // Sema::ActOnPopScope.
1694 return LHS.Loc < RHS.Loc;
1695 });
1696 for (const LocAndDiag &D : DeclDiags)
1697 Diag(Loc: D.Loc, PD: D.PD);
1698 }
1699
1700 if (!Diags.isIgnored(DiagID: diag::warn_unused_private_field, Loc: SourceLocation())) {
1701 // FIXME: Load additional unused private field candidates from the external
1702 // source.
1703 RecordCompleteMap RecordsComplete;
1704 RecordCompleteMap MNCComplete;
1705 for (const NamedDecl *D : UnusedPrivateFields) {
1706 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Val: D->getDeclContext());
1707 if (RD && !RD->isUnion() && !D->hasAttr<UnusedAttr>() &&
1708 IsRecordFullyDefined(RD, RecordsComplete, MNCComplete)) {
1709 Diag(Loc: D->getLocation(), DiagID: diag::warn_unused_private_field)
1710 << D->getDeclName();
1711 }
1712 }
1713 }
1714
1715 if (!Diags.isIgnored(DiagID: diag::warn_mismatched_delete_new, Loc: SourceLocation())) {
1716 if (ExternalSource)
1717 ExternalSource->ReadMismatchingDeleteExpressions(DeleteExprs);
1718 for (const auto &DeletedFieldInfo : DeleteExprs) {
1719 for (const auto &DeleteExprLoc : DeletedFieldInfo.second) {
1720 AnalyzeDeleteExprMismatch(Field: DeletedFieldInfo.first, DeleteLoc: DeleteExprLoc.first,
1721 DeleteWasArrayForm: DeleteExprLoc.second);
1722 }
1723 }
1724 }
1725
1726 AnalysisWarnings.IssueWarnings(D: Context.getTranslationUnitDecl());
1727
1728 if (Context.hasAnyFunctionEffects())
1729 performFunctionEffectAnalysis(TU: Context.getTranslationUnitDecl());
1730
1731 // Check we've noticed that we're no longer parsing the initializer for every
1732 // variable. If we miss cases, then at best we have a performance issue and
1733 // at worst a rejects-valid bug.
1734 assert(ParsingInitForAutoVars.empty() &&
1735 "Didn't unmark var as having its initializer parsed");
1736
1737 if (!PP.isIncrementalProcessingEnabled())
1738 TUScope = nullptr;
1739
1740 checkExposure(TU: Context.getTranslationUnitDecl());
1741}
1742
1743
1744//===----------------------------------------------------------------------===//
1745// Helper functions.
1746//===----------------------------------------------------------------------===//
1747
1748DeclContext *Sema::getFunctionLevelDeclContext(bool AllowLambda) const {
1749 DeclContext *DC = CurContext;
1750
1751 while (true) {
1752 if (isa<BlockDecl, EnumDecl, CapturedDecl, RequiresExprBodyDecl,
1753 CXXExpansionStmtDecl>(Val: DC)) {
1754 DC = DC->getParent();
1755 } else if (!AllowLambda && isa<CXXMethodDecl>(Val: DC) &&
1756 cast<CXXMethodDecl>(Val: DC)->getOverloadedOperator() == OO_Call &&
1757 cast<CXXRecordDecl>(Val: DC->getParent())->isLambda()) {
1758 DC = DC->getParent()->getParent();
1759 } else
1760 break;
1761 }
1762
1763 return DC;
1764}
1765
1766/// getCurFunctionDecl - If inside of a function body, this returns a pointer
1767/// to the function decl for the function being parsed. If we're currently
1768/// in a 'block', this returns the containing context.
1769FunctionDecl *Sema::getCurFunctionDecl(bool AllowLambda) const {
1770 DeclContext *DC = getFunctionLevelDeclContext(AllowLambda);
1771 return dyn_cast<FunctionDecl>(Val: DC);
1772}
1773
1774ObjCMethodDecl *Sema::getCurMethodDecl() {
1775 DeclContext *DC = getFunctionLevelDeclContext();
1776 while (isa<RecordDecl>(Val: DC))
1777 DC = DC->getParent();
1778 return dyn_cast<ObjCMethodDecl>(Val: DC);
1779}
1780
1781NamedDecl *Sema::getCurFunctionOrMethodDecl() const {
1782 DeclContext *DC = getFunctionLevelDeclContext();
1783 if (isa<ObjCMethodDecl>(Val: DC) || isa<FunctionDecl>(Val: DC))
1784 return cast<NamedDecl>(Val: DC);
1785 return nullptr;
1786}
1787
1788LangAS Sema::getDefaultCXXMethodAddrSpace() const {
1789 if (getLangOpts().OpenCL)
1790 return getASTContext().getDefaultOpenCLPointeeAddrSpace();
1791 return LangAS::Default;
1792}
1793
1794void Sema::EmitDiagnostic(unsigned DiagID, const DiagnosticBuilder &DB) {
1795 // FIXME: It doesn't make sense to me that DiagID is an incoming argument here
1796 // and yet we also use the current diag ID on the DiagnosticsEngine. This has
1797 // been made more painfully obvious by the refactor that introduced this
1798 // function, but it is possible that the incoming argument can be
1799 // eliminated. If it truly cannot be (for example, there is some reentrancy
1800 // issue I am not seeing yet), then there should at least be a clarifying
1801 // comment somewhere.
1802 Diagnostic DiagInfo(&Diags, DB);
1803 if (SFINAETrap *Trap = getSFINAEContext()) {
1804 sema::TemplateDeductionInfo *Info = Trap->getDeductionInfo();
1805 switch (DiagnosticIDs::getDiagnosticSFINAEResponse(DiagID: DiagInfo.getID())) {
1806 case DiagnosticIDs::SFINAE_Report:
1807 // We'll report the diagnostic below.
1808 break;
1809
1810 case DiagnosticIDs::SFINAE_SubstitutionFailure:
1811 // Count this failure so that we know that template argument deduction
1812 // has failed.
1813 Trap->setErrorOccurred();
1814
1815 // Make a copy of this suppressed diagnostic and store it with the
1816 // template-deduction information.
1817 if (Info && !Info->hasSFINAEDiagnostic())
1818 Info->addSFINAEDiagnostic(
1819 Loc: DiagInfo.getLocation(),
1820 PD: PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
1821
1822 Diags.setLastDiagnosticIgnored(true);
1823 return;
1824
1825 case DiagnosticIDs::SFINAE_AccessControl: {
1826 // Per C++ Core Issue 1170, access control is part of SFINAE.
1827 // Additionally, the WithAccessChecking flag can be used to temporarily
1828 // make access control a part of SFINAE for the purposes of checking
1829 // type traits.
1830 if (!Trap->withAccessChecking() && !getLangOpts().CPlusPlus11)
1831 break;
1832
1833 SourceLocation Loc = DiagInfo.getLocation();
1834
1835 // Suppress this diagnostic.
1836 Trap->setErrorOccurred();
1837
1838 // Make a copy of this suppressed diagnostic and store it with the
1839 // template-deduction information.
1840 if (Info && !Info->hasSFINAEDiagnostic())
1841 Info->addSFINAEDiagnostic(
1842 Loc: DiagInfo.getLocation(),
1843 PD: PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
1844
1845 Diags.setLastDiagnosticIgnored(true);
1846
1847 // Now produce a C++98 compatibility warning.
1848 Diag(Loc, DiagID: diag::warn_cxx98_compat_sfinae_access_control);
1849
1850 // The last diagnostic which Sema produced was ignored. Suppress any
1851 // notes attached to it.
1852 Diags.setLastDiagnosticIgnored(true);
1853 return;
1854 }
1855
1856 case DiagnosticIDs::SFINAE_Suppress:
1857 if (DiagnosticsEngine::Level Level = getDiagnostics().getDiagnosticLevel(
1858 DiagID: DiagInfo.getID(), Loc: DiagInfo.getLocation());
1859 Level == DiagnosticsEngine::Ignored)
1860 return;
1861 // Make a copy of this suppressed diagnostic and store it with the
1862 // template-deduction information;
1863 if (Info) {
1864 Info->addSuppressedDiagnostic(
1865 Loc: DiagInfo.getLocation(),
1866 PD: PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
1867 if (!Diags.getDiagnosticIDs()->isNote(DiagID))
1868 PrintContextStack(DiagFunc: [Info](SourceLocation Loc, PartialDiagnostic PD) {
1869 Info->addSuppressedDiagnostic(Loc, PD: std::move(PD));
1870 });
1871 }
1872
1873 // Suppress this diagnostic.
1874 Diags.setLastDiagnosticIgnored(true);
1875 return;
1876 }
1877 }
1878
1879 // Copy the diagnostic printing policy over the ASTContext printing policy.
1880 // TODO: Stop doing that. See: https://reviews.llvm.org/D45093#1090292
1881 Context.setPrintingPolicy(getPrintingPolicy());
1882
1883 // Emit the diagnostic.
1884 if (!Diags.EmitDiagnostic(DB))
1885 return;
1886
1887 // If this is not a note, and we're in a template instantiation
1888 // that is different from the last template instantiation where
1889 // we emitted an error, print a template instantiation
1890 // backtrace.
1891 if (!Diags.getDiagnosticIDs()->isNote(DiagID))
1892 PrintContextStack();
1893}
1894
1895bool Sema::hasUncompilableErrorOccurred() const {
1896 if (getDiagnostics().hasUncompilableErrorOccurred())
1897 return true;
1898 auto *FD = dyn_cast<FunctionDecl>(Val: CurContext);
1899 if (!FD)
1900 return false;
1901 auto Loc = DeviceDeferredDiags.find(Val: FD);
1902 if (Loc == DeviceDeferredDiags.end())
1903 return false;
1904 for (auto PDAt : Loc->second) {
1905 if (Diags.getDiagnosticIDs()->isDefaultMappingAsError(
1906 DiagID: PDAt.second.getDiagID()))
1907 return true;
1908 }
1909 return false;
1910}
1911
1912// Print notes showing how we can reach FD starting from an a priori
1913// known-callable function. When a function has multiple callers, emit
1914// each call chain separately. The first note in each chain uses
1915// "called by" and subsequent notes use "which is called by".
1916static void emitCallStackNotes(Sema &S, const FunctionDecl *FD) {
1917 auto FnIt = S.CUDA().DeviceKnownEmittedFns.find(Val: FD);
1918 if (FnIt == S.CUDA().DeviceKnownEmittedFns.end())
1919 return;
1920
1921 for (const auto &CallerInfo : FnIt->second) {
1922 if (S.Diags.hasFatalErrorOccurred())
1923 return;
1924 S.Diags.Report(Loc: CallerInfo.Loc, DiagID: diag::note_called_by) << CallerInfo.FD;
1925 // Walk up the rest of the chain using "which is called by".
1926 auto NextIt = S.CUDA().DeviceKnownEmittedFns.find(Val: CallerInfo.FD);
1927 while (NextIt != S.CUDA().DeviceKnownEmittedFns.end()) {
1928 if (S.Diags.hasFatalErrorOccurred())
1929 return;
1930 const auto &Next = NextIt->second.front();
1931 S.Diags.Report(Loc: Next.Loc, DiagID: diag::note_which_is_called_by) << Next.FD;
1932 NextIt = S.CUDA().DeviceKnownEmittedFns.find(Val: Next.FD);
1933 }
1934 }
1935}
1936
1937namespace {
1938
1939/// Helper class that emits deferred diagnostic messages if an entity directly
1940/// or indirectly using the function that causes the deferred diagnostic
1941/// messages is known to be emitted.
1942///
1943/// During parsing of AST, certain diagnostic messages are recorded as deferred
1944/// diagnostics since it is unknown whether the functions containing such
1945/// diagnostics will be emitted. A list of potentially emitted functions and
1946/// variables that may potentially trigger emission of functions are also
1947/// recorded. DeferredDiagnosticsEmitter recursively visits used functions
1948/// by each function to emit deferred diagnostics.
1949///
1950/// During the visit, certain OpenMP directives or initializer of variables
1951/// with certain OpenMP attributes will cause subsequent visiting of any
1952/// functions enter a state which is called OpenMP device context in this
1953/// implementation. The state is exited when the directive or initializer is
1954/// exited. This state can change the emission states of subsequent uses
1955/// of functions.
1956///
1957/// Conceptually the functions or variables to be visited form a use graph
1958/// where the parent node uses the child node. At any point of the visit,
1959/// the tree nodes traversed from the tree root to the current node form a use
1960/// stack. The emission state of the current node depends on two factors:
1961/// 1. the emission state of the root node
1962/// 2. whether the current node is in OpenMP device context
1963/// If the function is decided to be emitted, its contained deferred diagnostics
1964/// are emitted, together with the information about the use stack.
1965///
1966class DeferredDiagnosticsEmitter
1967 : public UsedDeclVisitor<DeferredDiagnosticsEmitter> {
1968public:
1969 typedef UsedDeclVisitor<DeferredDiagnosticsEmitter> Inherited;
1970
1971 // Whether the function is already in the current use-path.
1972 llvm::SmallPtrSet<CanonicalDeclPtr<Decl>, 4> InUsePath;
1973
1974 // The current use-path.
1975 llvm::SmallVector<CanonicalDeclPtr<FunctionDecl>, 4> UsePath;
1976
1977 // Whether the visiting of the function has been done. Done[0] is for the
1978 // case not in OpenMP device context. Done[1] is for the case in OpenMP
1979 // device context. We need two sets because diagnostics emission may be
1980 // different depending on whether it is in OpenMP device context.
1981 llvm::SmallPtrSet<CanonicalDeclPtr<Decl>, 4> DoneMap[2];
1982
1983 // Functions that need their deferred diagnostics emitted. Collected
1984 // during the graph walk and emitted afterwards so that all callers
1985 // are known when producing call chain notes.
1986 llvm::SetVector<CanonicalDeclPtr<const FunctionDecl>> FnsToEmit;
1987
1988 // Emission state of the root node of the current use graph.
1989 bool ShouldEmitRootNode;
1990
1991 // Current OpenMP device context level. It is initialized to 0 and each
1992 // entering of device context increases it by 1 and each exit decreases
1993 // it by 1. Non-zero value indicates it is currently in device context.
1994 unsigned InOMPDeviceContext;
1995
1996 DeferredDiagnosticsEmitter(Sema &S)
1997 : Inherited(S), ShouldEmitRootNode(false), InOMPDeviceContext(0) {}
1998
1999 bool shouldVisitDiscardedStmt() const { return false; }
2000
2001 void VisitOMPTargetDirective(OMPTargetDirective *Node) {
2002 ++InOMPDeviceContext;
2003 Inherited::VisitOMPTargetDirective(S: Node);
2004 --InOMPDeviceContext;
2005 }
2006
2007 void visitUsedDecl(SourceLocation Loc, Decl *D) {
2008 if (isa<VarDecl>(Val: D))
2009 return;
2010 if (auto *FD = dyn_cast<FunctionDecl>(Val: D))
2011 checkFunc(Loc, FD);
2012 else
2013 Inherited::visitUsedDecl(Loc, D);
2014 }
2015
2016 // Visitor member and parent dtors called by this dtor.
2017 void VisitCalledDestructors(CXXDestructorDecl *DD) {
2018 const CXXRecordDecl *RD = DD->getParent();
2019
2020 // Visit the dtors of all members
2021 for (const FieldDecl *FD : RD->fields()) {
2022 QualType FT = FD->getType();
2023 if (const auto *ClassDecl = FT->getAsCXXRecordDecl();
2024 ClassDecl &&
2025 (ClassDecl->isBeingDefined() || ClassDecl->isCompleteDefinition()))
2026 if (CXXDestructorDecl *MemberDtor = ClassDecl->getDestructor())
2027 asImpl().visitUsedDecl(Loc: MemberDtor->getLocation(), D: MemberDtor);
2028 }
2029
2030 // Also visit base class dtors
2031 for (const auto &Base : RD->bases()) {
2032 QualType BaseType = Base.getType();
2033 if (const auto *BaseDecl = BaseType->getAsCXXRecordDecl();
2034 BaseDecl &&
2035 (BaseDecl->isBeingDefined() || BaseDecl->isCompleteDefinition()))
2036 if (CXXDestructorDecl *BaseDtor = BaseDecl->getDestructor())
2037 asImpl().visitUsedDecl(Loc: BaseDtor->getLocation(), D: BaseDtor);
2038 }
2039 }
2040
2041 void VisitDeclStmt(DeclStmt *DS) {
2042 // Visit dtors called by variables that need destruction
2043 for (auto *D : DS->decls())
2044 if (auto *VD = dyn_cast<VarDecl>(Val: D))
2045 if (VD->isThisDeclarationADefinition() &&
2046 VD->needsDestruction(Ctx: S.Context)) {
2047 QualType VT = VD->getType();
2048 if (const auto *ClassDecl = VT->getAsCXXRecordDecl();
2049 ClassDecl && (ClassDecl->isBeingDefined() ||
2050 ClassDecl->isCompleteDefinition()))
2051 if (CXXDestructorDecl *Dtor = ClassDecl->getDestructor())
2052 asImpl().visitUsedDecl(Loc: Dtor->getLocation(), D: Dtor);
2053 }
2054
2055 Inherited::VisitDeclStmt(S: DS);
2056 }
2057 void checkVar(VarDecl *VD) {
2058 assert(VD->isFileVarDecl() &&
2059 "Should only check file-scope variables");
2060 if (auto *Init = VD->getInit()) {
2061 auto DevTy = OMPDeclareTargetDeclAttr::getDeviceType(VD);
2062 bool IsDev = DevTy && (*DevTy == OMPDeclareTargetDeclAttr::DT_NoHost ||
2063 *DevTy == OMPDeclareTargetDeclAttr::DT_Any);
2064 if (IsDev)
2065 ++InOMPDeviceContext;
2066 this->Visit(S: Init);
2067 if (IsDev)
2068 --InOMPDeviceContext;
2069 }
2070 }
2071
2072 void checkFunc(SourceLocation Loc, FunctionDecl *FD) {
2073 auto &Done = DoneMap[InOMPDeviceContext > 0 ? 1 : 0];
2074 FunctionDecl *Caller = UsePath.empty() ? nullptr : UsePath.back();
2075 if ((!ShouldEmitRootNode && !S.getLangOpts().OpenMP && !Caller) ||
2076 S.shouldIgnoreInHostDeviceCheck(Callee: FD) || InUsePath.count(Ptr: FD))
2077 return;
2078 // Finalize analysis of OpenMP-specific constructs.
2079 if (Caller && S.LangOpts.OpenMP && UsePath.size() == 1 &&
2080 (ShouldEmitRootNode || InOMPDeviceContext))
2081 S.OpenMP().finalizeOpenMPDelayedAnalysis(Caller, Callee: FD, Loc);
2082 if (Caller) {
2083 auto &Callers = S.CUDA().DeviceKnownEmittedFns[FD];
2084 CanonicalDeclPtr<const FunctionDecl> CanonCaller(Caller);
2085 if (llvm::none_of(Range&: Callers, P: [CanonCaller](const auto &C) {
2086 return C.FD == CanonCaller;
2087 }))
2088 Callers.push_back(Elt: {.FD: Caller, .Loc: Loc});
2089 }
2090 if (ShouldEmitRootNode || InOMPDeviceContext)
2091 FnsToEmit.insert(X: FD);
2092 // Do not revisit a function if the function body has been completely
2093 // visited before.
2094 if (!Done.insert(Ptr: FD).second)
2095 return;
2096 InUsePath.insert(Ptr: FD);
2097 UsePath.push_back(Elt: FD);
2098 if (auto *S = FD->getBody()) {
2099 this->Visit(S);
2100 }
2101 if (CXXDestructorDecl *Dtor = dyn_cast<CXXDestructorDecl>(Val: FD))
2102 asImpl().VisitCalledDestructors(DD: Dtor);
2103 UsePath.pop_back();
2104 InUsePath.erase(Ptr: FD);
2105 }
2106
2107 void checkRecordedDecl(Decl *D) {
2108 if (auto *FD = dyn_cast<FunctionDecl>(Val: D)) {
2109 ShouldEmitRootNode = S.getEmissionStatus(Decl: FD, /*Final=*/true) ==
2110 Sema::FunctionEmissionStatus::Emitted;
2111 checkFunc(Loc: SourceLocation(), FD);
2112 } else
2113 checkVar(VD: cast<VarDecl>(Val: D));
2114 }
2115
2116 void emitDeferredDiags(const FunctionDecl *FD) {
2117 auto It = S.DeviceDeferredDiags.find(Val: FD);
2118 if (It == S.DeviceDeferredDiags.end())
2119 return;
2120 bool HasWarningOrError = false;
2121 for (PartialDiagnosticAt &PDAt : It->second) {
2122 if (S.Diags.hasFatalErrorOccurred())
2123 return;
2124 const SourceLocation &Loc = PDAt.first;
2125 const PartialDiagnostic &PD = PDAt.second;
2126 HasWarningOrError |=
2127 S.getDiagnostics().getDiagnosticLevel(DiagID: PD.getDiagID(), Loc) >=
2128 DiagnosticsEngine::Warning;
2129 {
2130 DiagnosticBuilder Builder(S.Diags.Report(Loc, DiagID: PD.getDiagID()));
2131 PD.Emit(DB: Builder);
2132 }
2133 }
2134 if (HasWarningOrError)
2135 emitCallStackNotes(S, FD);
2136 }
2137
2138 void emitCollectedDiags() {
2139 for (const auto &FD : FnsToEmit)
2140 emitDeferredDiags(FD);
2141 }
2142};
2143} // namespace
2144
2145void Sema::emitDeferredDiags() {
2146 if (ExternalSource)
2147 ExternalSource->ReadDeclsToCheckForDeferredDiags(
2148 Decls&: DeclsToCheckForDeferredDiags);
2149
2150 // For each implicit-H+D-explicit-inst function with deferred errors but no
2151 // organic device caller, drop the diagnostics and mark for a trap body.
2152 auto ClassifyImplicitHDExplicitInst = [&]() {
2153 if (!LangOpts.CUDAIsDevice)
2154 return;
2155 for (auto &Pair : DeviceDeferredDiags) {
2156 const FunctionDecl *FD = Pair.first;
2157 if (!SemaCUDA::isImplicitHDExplicitInstantiation(FD))
2158 continue;
2159 if (CUDA().DeviceKnownEmittedFns.count(Val: FD))
2160 continue;
2161 bool HasError =
2162 llvm::any_of(Range&: Pair.second, P: [&](const PartialDiagnosticAt &PDAt) {
2163 return getDiagnostics().getDiagnosticLevel(DiagID: PDAt.second.getDiagID(),
2164 Loc: PDAt.first) >=
2165 DiagnosticsEngine::Error;
2166 });
2167 if (!HasError)
2168 continue;
2169 Pair.second.clear();
2170 Context.CUDADeviceInvalidFuncs.insert(Ptr: FD->getCanonicalDecl());
2171 }
2172 };
2173
2174 if ((DeviceDeferredDiags.empty() && !LangOpts.OpenMP) ||
2175 DeclsToCheckForDeferredDiags.empty()) {
2176 ClassifyImplicitHDExplicitInst();
2177 return;
2178 }
2179
2180 DeferredDiagnosticsEmitter DDE(*this);
2181 for (auto *D : DeclsToCheckForDeferredDiags)
2182 DDE.checkRecordedDecl(D);
2183 ClassifyImplicitHDExplicitInst();
2184 DDE.emitCollectedDiags();
2185}
2186
2187// In CUDA, there are some constructs which may appear in semantically-valid
2188// code, but trigger errors if we ever generate code for the function in which
2189// they appear. Essentially every construct you're not allowed to use on the
2190// device falls into this category, because you are allowed to use these
2191// constructs in a __host__ __device__ function, but only if that function is
2192// never codegen'ed on the device.
2193//
2194// To handle semantic checking for these constructs, we keep track of the set of
2195// functions we know will be emitted, either because we could tell a priori that
2196// they would be emitted, or because they were transitively called by a
2197// known-emitted function.
2198//
2199// We also keep a partial call graph of which not-known-emitted functions call
2200// which other not-known-emitted functions.
2201//
2202// When we see something which is illegal if the current function is emitted
2203// (usually by way of DiagIfDeviceCode, DiagIfHostCode, or
2204// CheckCall), we first check if the current function is known-emitted. If
2205// so, we immediately output the diagnostic.
2206//
2207// Otherwise, we "defer" the diagnostic. It sits in Sema::DeviceDeferredDiags
2208// until we discover that the function is known-emitted, at which point we take
2209// it out of this map and emit the diagnostic.
2210
2211Sema::SemaDiagnosticBuilder::SemaDiagnosticBuilder(Kind K, SourceLocation Loc,
2212 unsigned DiagID,
2213 const FunctionDecl *Fn,
2214 Sema &S)
2215 : S(S), Loc(Loc), DiagID(DiagID), Fn(Fn),
2216 ShowCallStack(K == K_ImmediateWithCallStack || K == K_Deferred) {
2217 switch (K) {
2218 case K_Nop:
2219 break;
2220 case K_Immediate:
2221 case K_ImmediateWithCallStack:
2222 ImmediateDiag.emplace(
2223 args: ImmediateDiagBuilder(S.Diags.Report(Loc, DiagID), S, DiagID));
2224 break;
2225 case K_Deferred:
2226 assert(Fn && "Must have a function to attach the deferred diag to.");
2227 auto &Diags = S.DeviceDeferredDiags[Fn];
2228 PartialDiagId.emplace(args: Diags.size());
2229 Diags.emplace_back(args&: Loc, args: S.PDiag(DiagID));
2230 break;
2231 }
2232}
2233
2234Sema::SemaDiagnosticBuilder::SemaDiagnosticBuilder(SemaDiagnosticBuilder &&D)
2235 : S(D.S), Loc(D.Loc), DiagID(D.DiagID), Fn(D.Fn),
2236 ShowCallStack(D.ShowCallStack), ImmediateDiag(D.ImmediateDiag),
2237 PartialDiagId(D.PartialDiagId) {
2238 // Clean the previous diagnostics.
2239 D.ShowCallStack = false;
2240 D.ImmediateDiag.reset();
2241 D.PartialDiagId.reset();
2242}
2243
2244Sema::SemaDiagnosticBuilder::~SemaDiagnosticBuilder() {
2245 if (ImmediateDiag) {
2246 // Emit our diagnostic and, if it was a warning or error, output a callstack
2247 // if Fn isn't a priori known-emitted.
2248 ImmediateDiag.reset(); // Emit the immediate diag.
2249
2250 if (ShowCallStack) {
2251 bool IsWarningOrError = S.getDiagnostics().getDiagnosticLevel(
2252 DiagID, Loc) >= DiagnosticsEngine::Warning;
2253 if (IsWarningOrError)
2254 emitCallStackNotes(S, FD: Fn);
2255 }
2256 } else {
2257 assert((!PartialDiagId || ShowCallStack) &&
2258 "Must always show call stack for deferred diags.");
2259 }
2260}
2261
2262Sema::SemaDiagnosticBuilder
2263Sema::targetDiag(SourceLocation Loc, unsigned DiagID, const FunctionDecl *FD) {
2264 FD = FD ? FD : getCurFunctionDecl();
2265 if (LangOpts.OpenMP)
2266 return LangOpts.OpenMPIsTargetDevice
2267 ? OpenMP().diagIfOpenMPDeviceCode(Loc, DiagID, FD)
2268 : OpenMP().diagIfOpenMPHostCode(Loc, DiagID, FD);
2269 if (getLangOpts().CUDA)
2270 return getLangOpts().CUDAIsDevice ? CUDA().DiagIfDeviceCode(Loc, DiagID)
2271 : CUDA().DiagIfHostCode(Loc, DiagID);
2272
2273 if (getLangOpts().SYCLIsDevice)
2274 return SYCL().DiagIfDeviceCode(Loc, DiagID);
2275
2276 return SemaDiagnosticBuilder(SemaDiagnosticBuilder::K_Immediate, Loc, DiagID,
2277 FD, *this);
2278}
2279
2280void Sema::checkTypeSupport(QualType Ty, SourceLocation Loc, ValueDecl *D) {
2281 if (isUnevaluatedContext() || Ty.isNull())
2282 return;
2283
2284 // The original idea behind checkTypeSupport function is that unused
2285 // declarations can be replaced with an array of bytes of the same size during
2286 // codegen, such replacement doesn't seem to be possible for types without
2287 // constant byte size like zero length arrays. So, do a deep check for SYCL.
2288 if (D && LangOpts.SYCLIsDevice) {
2289 llvm::DenseSet<QualType> Visited;
2290 SYCL().deepTypeCheckForDevice(UsedAt: Loc, Visited, DeclToCheck: D);
2291 }
2292
2293 Decl *C = cast<Decl>(Val: getCurLexicalContext());
2294
2295 // Memcpy operations for structs containing a member with unsupported type
2296 // are ok, though.
2297 if (const auto *MD = dyn_cast<CXXMethodDecl>(Val: C)) {
2298 if ((MD->isCopyAssignmentOperator() || MD->isMoveAssignmentOperator()) &&
2299 MD->isTrivial())
2300 return;
2301
2302 if (const auto *Ctor = dyn_cast<CXXConstructorDecl>(Val: MD))
2303 if (Ctor->isCopyOrMoveConstructor() && Ctor->isTrivial())
2304 return;
2305 }
2306
2307 // Try to associate errors with the lexical context, if that is a function, or
2308 // the value declaration otherwise.
2309 const FunctionDecl *FD = isa<FunctionDecl>(Val: C)
2310 ? cast<FunctionDecl>(Val: C)
2311 : dyn_cast_or_null<FunctionDecl>(Val: D);
2312
2313 auto CheckDeviceType = [&](QualType Ty) {
2314 if (Ty->isDependentType())
2315 return;
2316
2317 if (Ty->isBitIntType()) {
2318 if (!Context.getTargetInfo().hasBitIntType()) {
2319 PartialDiagnostic PD = PDiag(DiagID: diag::err_target_unsupported_type);
2320 if (D)
2321 PD << D;
2322 else
2323 PD << "expression";
2324 targetDiag(Loc, PD, FD)
2325 << false /*show bit size*/ << 0 /*bitsize*/ << false /*return*/
2326 << Ty << Context.getTargetInfo().getTriple().str();
2327 }
2328 return;
2329 }
2330
2331 // Check if we are dealing with two 'long double' but with different
2332 // semantics.
2333 bool LongDoubleMismatched = false;
2334 if (Ty->isRealFloatingType() && Context.getTypeSize(T: Ty) == 128) {
2335 const llvm::fltSemantics &Sem = Context.getFloatTypeSemantics(T: Ty);
2336 if ((&Sem != &llvm::APFloat::PPCDoubleDouble() &&
2337 !Context.getTargetInfo().hasFloat128Type()) ||
2338 (&Sem == &llvm::APFloat::PPCDoubleDouble() &&
2339 !Context.getTargetInfo().hasIbm128Type()))
2340 LongDoubleMismatched = true;
2341 }
2342
2343 if ((Ty->isFloat16Type() && !Context.getTargetInfo().hasFloat16Type()) ||
2344 (Ty->isFloat128Type() && !Context.getTargetInfo().hasFloat128Type()) ||
2345 (Ty->isIbm128Type() && !Context.getTargetInfo().hasIbm128Type()) ||
2346 (Ty->isIntegerType() && Context.getTypeSize(T: Ty) == 128 &&
2347 !Context.getTargetInfo().hasInt128Type()) ||
2348 (Ty->isBFloat16Type() && !Context.getTargetInfo().hasBFloat16Type() &&
2349 !LangOpts.CUDAIsDevice) ||
2350 LongDoubleMismatched) {
2351 PartialDiagnostic PD = PDiag(DiagID: diag::err_target_unsupported_type);
2352 if (D)
2353 PD << D;
2354 else
2355 PD << "expression";
2356
2357 if (targetDiag(Loc, PD, FD)
2358 << true /*show bit size*/
2359 << static_cast<unsigned>(Context.getTypeSize(T: Ty)) << Ty
2360 << false /*return*/ << Context.getTargetInfo().getTriple().str()) {
2361 if (D)
2362 D->setInvalidDecl();
2363 }
2364 if (D)
2365 targetDiag(Loc: D->getLocation(), DiagID: diag::note_defined_here, FD) << D;
2366 }
2367 };
2368
2369 auto CheckType = [&](QualType Ty, bool IsRetTy = false) {
2370 if (LangOpts.SYCLIsDevice ||
2371 (LangOpts.OpenMP && LangOpts.OpenMPIsTargetDevice) ||
2372 LangOpts.CUDAIsDevice)
2373 CheckDeviceType(Ty);
2374
2375 QualType UnqualTy = Ty.getCanonicalType().getUnqualifiedType();
2376 const TargetInfo &TI = Context.getTargetInfo();
2377 if (!TI.hasLongDoubleType() && UnqualTy == Context.LongDoubleTy) {
2378 PartialDiagnostic PD = PDiag(DiagID: diag::err_target_unsupported_type);
2379 if (D)
2380 PD << D;
2381 else
2382 PD << "expression";
2383
2384 if (Diag(Loc, PD) << false /*show bit size*/ << 0 << Ty
2385 << false /*return*/
2386 << TI.getTriple().str()) {
2387 if (D)
2388 D->setInvalidDecl();
2389 }
2390 if (D)
2391 targetDiag(Loc: D->getLocation(), DiagID: diag::note_defined_here, FD) << D;
2392 }
2393
2394 bool IsDouble = UnqualTy == Context.DoubleTy;
2395 bool IsFloat = UnqualTy == Context.FloatTy;
2396 if (IsRetTy && !TI.hasFPReturn() && (IsDouble || IsFloat)) {
2397 PartialDiagnostic PD = PDiag(DiagID: diag::err_target_unsupported_type);
2398 if (D)
2399 PD << D;
2400 else
2401 PD << "expression";
2402
2403 if (Diag(Loc, PD) << false /*show bit size*/ << 0 << Ty << true /*return*/
2404 << TI.getTriple().str()) {
2405 if (D)
2406 D->setInvalidDecl();
2407 }
2408 if (D)
2409 targetDiag(Loc: D->getLocation(), DiagID: diag::note_defined_here, FD) << D;
2410 }
2411
2412 if (TI.hasRISCVVTypes() && Ty->isRVVSizelessBuiltinType() && FD) {
2413 llvm::StringMap<bool> CallerFeatureMap;
2414 Context.getFunctionFeatureMap(FeatureMap&: CallerFeatureMap, FD);
2415 RISCV().checkRVVTypeSupport(Ty, Loc, D, FeatureMap: CallerFeatureMap);
2416 }
2417
2418 // Don't allow SVE types in functions without a SVE target.
2419 if (Ty->isSVESizelessBuiltinType() && FD) {
2420 llvm::StringMap<bool> CallerFeatureMap;
2421 Context.getFunctionFeatureMap(FeatureMap&: CallerFeatureMap, FD);
2422 ARM().checkSVETypeSupport(Ty, Loc, FD, FeatureMap: CallerFeatureMap);
2423 }
2424
2425 if (TI.hasAMDGPUTypes())
2426 AMDGPU().checkAMDGPUTypeSupport(Ty, Loc);
2427
2428 if (auto *VT = Ty->getAs<VectorType>();
2429 VT && FD &&
2430 (VT->getVectorKind() == VectorKind::SveFixedLengthData ||
2431 VT->getVectorKind() == VectorKind::SveFixedLengthPredicate) &&
2432 (LangOpts.VScaleMin != LangOpts.VScaleStreamingMin ||
2433 LangOpts.VScaleMax != LangOpts.VScaleStreamingMax)) {
2434 if (IsArmStreamingFunction(FD, /*IncludeLocallyStreaming=*/true)) {
2435 Diag(Loc, DiagID: diag::err_sve_fixed_vector_in_streaming_function)
2436 << Ty << /*Streaming*/ 0;
2437 } else if (const auto *FTy = FD->getType()->getAs<FunctionProtoType>()) {
2438 if (FTy->getAArch64SMEAttributes() &
2439 FunctionType::SME_PStateSMCompatibleMask) {
2440 Diag(Loc, DiagID: diag::err_sve_fixed_vector_in_streaming_function)
2441 << Ty << /*StreamingCompatible*/ 1;
2442 }
2443 }
2444 }
2445 };
2446
2447 CheckType(Ty);
2448 if (const auto *FPTy = dyn_cast<FunctionProtoType>(Val&: Ty)) {
2449 for (const auto &ParamTy : FPTy->param_types())
2450 CheckType(ParamTy);
2451 CheckType(FPTy->getReturnType(), /*IsRetTy=*/true);
2452 }
2453 if (const auto *FNPTy = dyn_cast<FunctionNoProtoType>(Val&: Ty))
2454 CheckType(FNPTy->getReturnType(), /*IsRetTy=*/true);
2455}
2456
2457bool Sema::findMacroSpelling(SourceLocation &locref, StringRef name) {
2458 SourceLocation loc = locref;
2459 if (!loc.isMacroID()) return false;
2460
2461 // There's no good way right now to look at the intermediate
2462 // expansions, so just jump to the expansion location.
2463 loc = getSourceManager().getExpansionLoc(Loc: loc);
2464
2465 // If that's written with the name, stop here.
2466 SmallString<16> buffer;
2467 if (getPreprocessor().getSpelling(loc, buffer) == name) {
2468 locref = loc;
2469 return true;
2470 }
2471 return false;
2472}
2473
2474Scope *Sema::getScopeForContext(DeclContext *Ctx) {
2475
2476 if (!Ctx)
2477 return nullptr;
2478
2479 Ctx = Ctx->getPrimaryContext();
2480 for (Scope *S = getCurScope(); S; S = S->getParent()) {
2481 // Ignore scopes that cannot have declarations. This is important for
2482 // out-of-line definitions of static class members.
2483 if (S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope))
2484 if (DeclContext *Entity = S->getEntity())
2485 if (Ctx == Entity->getPrimaryContext())
2486 return S;
2487 }
2488
2489 return nullptr;
2490}
2491
2492/// Enter a new function scope
2493void Sema::PushFunctionScope() {
2494 if (FunctionScopes.empty() && CachedFunctionScope) {
2495 // Use CachedFunctionScope to avoid allocating memory when possible.
2496 CachedFunctionScope->Clear();
2497 FunctionScopes.push_back(Elt: CachedFunctionScope.release());
2498 } else {
2499 FunctionScopes.push_back(Elt: new FunctionScopeInfo(getDiagnostics()));
2500 }
2501 if (LangOpts.OpenMP)
2502 OpenMP().pushOpenMPFunctionRegion();
2503}
2504
2505void Sema::PushBlockScope(Scope *BlockScope, BlockDecl *Block) {
2506 FunctionScopes.push_back(Elt: new BlockScopeInfo(getDiagnostics(),
2507 BlockScope, Block));
2508 CapturingFunctionScopes++;
2509}
2510
2511LambdaScopeInfo *Sema::PushLambdaScope() {
2512 LambdaScopeInfo *const LSI = new LambdaScopeInfo(getDiagnostics());
2513 FunctionScopes.push_back(Elt: LSI);
2514 CapturingFunctionScopes++;
2515 return LSI;
2516}
2517
2518void Sema::RecordParsingTemplateParameterDepth(unsigned Depth) {
2519 if (LambdaScopeInfo *const LSI = getCurLambda()) {
2520 LSI->AutoTemplateParameterDepth = Depth;
2521 return;
2522 }
2523 llvm_unreachable(
2524 "Remove assertion if intentionally called in a non-lambda context.");
2525}
2526
2527// Check that the type of the VarDecl has an accessible copy constructor and
2528// resolve its destructor's exception specification.
2529// This also performs initialization of block variables when they are moved
2530// to the heap. It uses the same rules as applicable for implicit moves
2531// according to the C++ standard in effect ([class.copy.elision]p3).
2532static void checkEscapingByref(VarDecl *VD, Sema &S) {
2533 QualType T = VD->getType();
2534 EnterExpressionEvaluationContext scope(
2535 S, Sema::ExpressionEvaluationContext::PotentiallyEvaluated);
2536 SourceLocation Loc = VD->getLocation();
2537 Expr *VarRef =
2538 new (S.Context) DeclRefExpr(S.Context, VD, false, T, VK_LValue, Loc);
2539 ExprResult Result;
2540 auto IE = InitializedEntity::InitializeBlock(BlockVarLoc: Loc, Type: T);
2541 if (S.getLangOpts().CPlusPlus23) {
2542 auto *E = ImplicitCastExpr::Create(Context: S.Context, T, Kind: CK_NoOp, Operand: VarRef, BasePath: nullptr,
2543 Cat: VK_XValue, FPO: FPOptionsOverride());
2544 Result = S.PerformCopyInitialization(Entity: IE, EqualLoc: SourceLocation(), Init: E);
2545 } else {
2546 Result = S.PerformMoveOrCopyInitialization(
2547 Entity: IE, NRInfo: Sema::NamedReturnInfo{.Candidate: VD, .S: Sema::NamedReturnInfo::MoveEligible},
2548 Value: VarRef);
2549 }
2550
2551 if (!Result.isInvalid()) {
2552 Result = S.MaybeCreateExprWithCleanups(SubExpr: Result);
2553 Expr *Init = Result.getAs<Expr>();
2554 S.Context.setBlockVarCopyInit(VD, CopyExpr: Init, CanThrow: S.canThrow(E: Init));
2555 }
2556
2557 // The destructor's exception specification is needed when IRGen generates
2558 // block copy/destroy functions. Resolve it here.
2559 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
2560 if (CXXDestructorDecl *DD = RD->getDestructor()) {
2561 auto *FPT = DD->getType()->castAs<FunctionProtoType>();
2562 S.ResolveExceptionSpec(Loc, FPT);
2563 }
2564}
2565
2566static void markEscapingByrefs(const FunctionScopeInfo &FSI, Sema &S) {
2567 // Set the EscapingByref flag of __block variables captured by
2568 // escaping blocks.
2569 for (const BlockDecl *BD : FSI.Blocks) {
2570 for (const BlockDecl::Capture &BC : BD->captures()) {
2571 VarDecl *VD = BC.getVariable();
2572 if (VD->hasAttr<BlocksAttr>()) {
2573 // Nothing to do if this is a __block variable captured by a
2574 // non-escaping block.
2575 if (BD->doesNotEscape())
2576 continue;
2577 VD->setEscapingByref();
2578 }
2579 // Check whether the captured variable is or contains an object of
2580 // non-trivial C union type.
2581 QualType CapType = BC.getVariable()->getType();
2582 if (CapType.hasNonTrivialToPrimitiveDestructCUnion() ||
2583 CapType.hasNonTrivialToPrimitiveCopyCUnion())
2584 S.checkNonTrivialCUnion(QT: BC.getVariable()->getType(),
2585 Loc: BD->getCaretLocation(),
2586 UseContext: NonTrivialCUnionContext::BlockCapture,
2587 NonTrivialKind: Sema::NTCUK_Destruct | Sema::NTCUK_Copy);
2588 }
2589 }
2590
2591 for (VarDecl *VD : FSI.ByrefBlockVars) {
2592 // __block variables might require us to capture a copy-initializer.
2593 if (!VD->isEscapingByref())
2594 continue;
2595 // It's currently invalid to ever have a __block variable with an
2596 // array type; should we diagnose that here?
2597 // Regardless, we don't want to ignore array nesting when
2598 // constructing this copy.
2599 if (VD->getType()->isStructureOrClassType())
2600 checkEscapingByref(VD, S);
2601 }
2602}
2603
2604Sema::PoppedFunctionScopePtr
2605Sema::PopFunctionScopeInfo(const AnalysisBasedWarnings::Policy *WP, Decl *D,
2606 QualType BlockType) {
2607 assert(!FunctionScopes.empty() && "mismatched push/pop!");
2608
2609 markEscapingByrefs(FSI: *FunctionScopes.back(), S&: *this);
2610
2611 PoppedFunctionScopePtr Scope(FunctionScopes.pop_back_val(),
2612 PoppedFunctionScopeDeleter(this));
2613
2614 if (LangOpts.OpenMP)
2615 OpenMP().popOpenMPFunctionRegion(OldFSI: Scope.get());
2616
2617 // Issue any analysis-based warnings.
2618 if (WP && D) {
2619 inferNoReturnAttr(S&: *this, D);
2620 AnalysisWarnings.IssueWarnings(P: *WP, fscope: Scope.get(), D, BlockType);
2621 } else
2622 for (const auto &PUD : Scope->PossiblyUnreachableDiags)
2623 Diag(Loc: PUD.Loc, PD: PUD.PD);
2624
2625 return Scope;
2626}
2627
2628void Sema::PoppedFunctionScopeDeleter::
2629operator()(sema::FunctionScopeInfo *Scope) const {
2630 if (!Scope->isPlainFunction())
2631 Self->CapturingFunctionScopes--;
2632 // Stash the function scope for later reuse if it's for a normal function.
2633 if (Scope->isPlainFunction() && !Self->CachedFunctionScope)
2634 Self->CachedFunctionScope.reset(p: Scope);
2635 else
2636 delete Scope;
2637}
2638
2639void Sema::PushCompoundScope(bool IsStmtExpr) {
2640 getCurFunction()->CompoundScopes.push_back(
2641 Elt: CompoundScopeInfo(IsStmtExpr, getCurFPFeatures()));
2642}
2643
2644void Sema::PopCompoundScope() {
2645 FunctionScopeInfo *CurFunction = getCurFunction();
2646 assert(!CurFunction->CompoundScopes.empty() && "mismatched push/pop");
2647
2648 CurFunction->CompoundScopes.pop_back();
2649}
2650
2651bool Sema::hasAnyUnrecoverableErrorsInThisFunction() const {
2652 return getCurFunction()->hasUnrecoverableErrorOccurred();
2653}
2654
2655void Sema::setFunctionHasBranchIntoScope() {
2656 if (!FunctionScopes.empty())
2657 FunctionScopes.back()->setHasBranchIntoScope();
2658}
2659
2660void Sema::setFunctionHasBranchProtectedScope() {
2661 if (!FunctionScopes.empty())
2662 FunctionScopes.back()->setHasBranchProtectedScope();
2663}
2664
2665void Sema::setFunctionHasIndirectGoto() {
2666 if (!FunctionScopes.empty())
2667 FunctionScopes.back()->setHasIndirectGoto();
2668}
2669
2670void Sema::setFunctionHasMustTail() {
2671 if (!FunctionScopes.empty())
2672 FunctionScopes.back()->setHasMustTail();
2673}
2674
2675BlockScopeInfo *Sema::getCurBlock() {
2676 if (FunctionScopes.empty())
2677 return nullptr;
2678
2679 auto CurBSI = dyn_cast<BlockScopeInfo>(Val: FunctionScopes.back());
2680 if (CurBSI && CurBSI->TheDecl &&
2681 !CurBSI->TheDecl->Encloses(DC: CurContext)) {
2682 // We have switched contexts due to template instantiation.
2683 assert(!CodeSynthesisContexts.empty());
2684 return nullptr;
2685 }
2686
2687 return CurBSI;
2688}
2689
2690FunctionScopeInfo *Sema::getEnclosingFunction() const {
2691 if (FunctionScopes.empty())
2692 return nullptr;
2693
2694 for (int e = FunctionScopes.size() - 1; e >= 0; --e) {
2695 if (isa<sema::BlockScopeInfo>(Val: FunctionScopes[e]))
2696 continue;
2697 return FunctionScopes[e];
2698 }
2699 return nullptr;
2700}
2701
2702CapturingScopeInfo *Sema::getEnclosingLambdaOrBlock() const {
2703 for (auto *Scope : llvm::reverse(C: FunctionScopes)) {
2704 if (auto *CSI = dyn_cast<CapturingScopeInfo>(Val: Scope)) {
2705 auto *LSI = dyn_cast<LambdaScopeInfo>(Val: CSI);
2706 if (LSI && LSI->Lambda && !LSI->Lambda->Encloses(DC: CurContext) &&
2707 LSI->AfterParameterList) {
2708 // We have switched contexts due to template instantiation.
2709 // FIXME: We should swap out the FunctionScopes during code synthesis
2710 // so that we don't need to check for this.
2711 assert(!CodeSynthesisContexts.empty());
2712 return nullptr;
2713 }
2714 return CSI;
2715 }
2716 }
2717 return nullptr;
2718}
2719
2720LambdaScopeInfo *Sema::getCurLambda(bool IgnoreNonLambdaCapturingScope) {
2721 if (FunctionScopes.empty())
2722 return nullptr;
2723
2724 auto I = FunctionScopes.rbegin();
2725 if (IgnoreNonLambdaCapturingScope) {
2726 auto E = FunctionScopes.rend();
2727 while (I != E && isa<CapturingScopeInfo>(Val: *I) && !isa<LambdaScopeInfo>(Val: *I))
2728 ++I;
2729 if (I == E)
2730 return nullptr;
2731 }
2732 auto *CurLSI = dyn_cast<LambdaScopeInfo>(Val: *I);
2733 if (CurLSI && CurLSI->Lambda && CurLSI->CallOperator &&
2734 !CurLSI->Lambda->Encloses(DC: CurContext) && CurLSI->AfterParameterList) {
2735 // We have switched contexts due to template instantiation.
2736 assert(!CodeSynthesisContexts.empty());
2737 return nullptr;
2738 }
2739
2740 return CurLSI;
2741}
2742
2743// We have a generic lambda if we parsed auto parameters, or we have
2744// an associated template parameter list.
2745LambdaScopeInfo *Sema::getCurGenericLambda() {
2746 if (LambdaScopeInfo *LSI = getCurLambda()) {
2747 return (LSI->TemplateParams.size() ||
2748 LSI->GLTemplateParameterList) ? LSI : nullptr;
2749 }
2750 return nullptr;
2751}
2752
2753bool Sema::shouldRetainCommentsInAST(SourceLocation Loc) {
2754 if (!LangOpts.CommentOpts.RetainCommentsFromSystemHeaders &&
2755 SourceMgr.isInSystemHeader(Loc))
2756 return false;
2757
2758 if (LangOpts.CommentOpts.ParseAllComments)
2759 return true;
2760
2761 if (LangOpts.CommentOpts.RetainComments)
2762 return true;
2763
2764 // When building a PCH the comments are serialized into the AST file
2765 // so downstream consumers like clangd) can retrieve documentation, and the
2766 // incremental/REPL front end may query them interactively.
2767 if (TUKind != TU_Complete)
2768 return true;
2769
2770 if (PP.isCodeCompletionEnabled())
2771 return true;
2772
2773 // Keep the comment if a documentation warning is enabled at its location.
2774 // Checking the location, rather than globally, is what makes a warning
2775 // turned on by a `#pragma clang diagnostic` take effect.
2776 return areDocumentationDiagsEnabled(Loc);
2777}
2778
2779bool Sema::computeDocumentationDiagsAt(SourceLocation Loc) const {
2780 return !Diags.areAllIgnored(Group: "documentation", Loc) ||
2781 !Diags.areAllIgnored(Group: "documentation-pedantic", Loc);
2782}
2783
2784void Sema::clearDocumentationDiagsCache() {
2785 DocDiagsStateKey = nullptr;
2786 DocDiagsExactComputed = 0;
2787}
2788
2789bool Sema::areDocumentationDiagsEnabled(SourceLocation Loc) {
2790 // Under a suppression mapping the severity depends on the file path rather
2791 // than the diagnostic state, so there is nothing stable to key a cache on.
2792 if (Loc.isInvalid() || Diags.hasDiagSuppressionMapping())
2793 return computeDocumentationDiagsAt(Loc);
2794
2795 const void *StateKey = Diags.getDiagStateKeyForLoc(Loc);
2796 if (StateKey != DocDiagsStateKey) {
2797 DocDiagsStateKey = StateKey;
2798 {
2799 // Answer as if Loc were not in a system header.
2800 ForceSystemWarningsRAII ShowSystemWarnings(Diags);
2801 DocDiagsEnabledIgnoringSystem = computeDocumentationDiagsAt(Loc);
2802 }
2803 DocDiagsExactComputed = 0;
2804 }
2805
2806 if (!DocDiagsEnabledIgnoringSystem)
2807 return false;
2808
2809 DiagStateSystemClass SysClass = Diags.getDiagStateSystemClassForLoc(Loc);
2810 if (SysClass == DiagStateSystemClass::UserCode)
2811 return true;
2812
2813 const unsigned Bit = 1u << static_cast<unsigned>(SysClass);
2814 if (!(DocDiagsExactComputed & Bit)) {
2815 DocDiagsExactComputed |= Bit;
2816 if (computeDocumentationDiagsAt(Loc))
2817 DocDiagsExactEnabled |= Bit;
2818 else
2819 DocDiagsExactEnabled &= ~Bit;
2820 }
2821 return (DocDiagsExactEnabled & Bit) != 0;
2822}
2823
2824void Sema::ActOnComment(SourceRange Comment) {
2825 if (!shouldRetainCommentsInAST(Loc: Comment.getBegin()))
2826 return;
2827 RawComment RC(SourceMgr, Comment, LangOpts.CommentOpts, false);
2828 if (RC.isAlmostTrailingComment() || RC.hasUnsupportedSplice(SourceMgr)) {
2829 SourceRange MagicMarkerRange(Comment.getBegin(),
2830 Comment.getBegin().getLocWithOffset(Offset: 3));
2831 StringRef MagicMarkerText;
2832 switch (RC.getKind()) {
2833 case RawComment::RCK_OrdinaryBCPL:
2834 MagicMarkerText = "///<";
2835 break;
2836 case RawComment::RCK_OrdinaryC:
2837 MagicMarkerText = "/**<";
2838 break;
2839 case RawComment::RCK_Invalid:
2840 // FIXME: are there other scenarios that could produce an invalid
2841 // raw comment here?
2842 Diag(Loc: Comment.getBegin(), DiagID: diag::warn_splice_in_doxygen_comment);
2843 return;
2844 default:
2845 llvm_unreachable("if this is an almost Doxygen comment, "
2846 "it should be ordinary");
2847 }
2848 Diag(Loc: Comment.getBegin(), DiagID: diag::warn_not_a_doxygen_trailing_member_comment) <<
2849 FixItHint::CreateReplacement(RemoveRange: MagicMarkerRange, Code: MagicMarkerText);
2850 }
2851 Context.addComment(RC);
2852}
2853
2854// Pin this vtable to this file.
2855ExternalSemaSource::~ExternalSemaSource() {}
2856char ExternalSemaSource::ID;
2857
2858void ExternalSemaSource::ReadMethodPool(Selector Sel) { }
2859void ExternalSemaSource::updateOutOfDateSelector(Selector Sel) { }
2860
2861void ExternalSemaSource::ReadKnownNamespaces(
2862 SmallVectorImpl<NamespaceDecl *> &Namespaces) {
2863}
2864
2865void ExternalSemaSource::ReadUndefinedButUsed(
2866 llvm::MapVector<NamedDecl *, SourceLocation> &Undefined) {}
2867
2868void ExternalSemaSource::ReadMismatchingDeleteExpressions(llvm::MapVector<
2869 FieldDecl *, llvm::SmallVector<std::pair<SourceLocation, bool>, 4>> &) {}
2870
2871bool Sema::tryExprAsCall(Expr &E, QualType &ZeroArgCallReturnTy,
2872 UnresolvedSetImpl &OverloadSet) {
2873 ZeroArgCallReturnTy = QualType();
2874 OverloadSet.clear();
2875
2876 const OverloadExpr *Overloads = nullptr;
2877 bool IsMemExpr = false;
2878 if (E.getType() == Context.OverloadTy) {
2879 OverloadExpr::FindResult FR = OverloadExpr::find(E: &E);
2880
2881 // Ignore overloads that are pointer-to-member constants.
2882 if (FR.HasFormOfMemberPointer)
2883 return false;
2884
2885 Overloads = FR.Expression;
2886 } else if (E.getType() == Context.BoundMemberTy) {
2887 Overloads = dyn_cast<UnresolvedMemberExpr>(Val: E.IgnoreParens());
2888 IsMemExpr = true;
2889 }
2890
2891 bool Ambiguous = false;
2892 bool IsMV = false;
2893
2894 if (Overloads) {
2895 for (OverloadExpr::decls_iterator it = Overloads->decls_begin(),
2896 DeclsEnd = Overloads->decls_end(); it != DeclsEnd; ++it) {
2897 OverloadSet.addDecl(D: *it);
2898
2899 // Check whether the function is a non-template, non-member which takes no
2900 // arguments.
2901 if (IsMemExpr)
2902 continue;
2903 if (const FunctionDecl *OverloadDecl
2904 = dyn_cast<FunctionDecl>(Val: (*it)->getUnderlyingDecl())) {
2905 if (OverloadDecl->getMinRequiredArguments() == 0) {
2906 if (!ZeroArgCallReturnTy.isNull() && !Ambiguous &&
2907 (!IsMV || !(OverloadDecl->isCPUDispatchMultiVersion() ||
2908 OverloadDecl->isCPUSpecificMultiVersion()))) {
2909 ZeroArgCallReturnTy = QualType();
2910 Ambiguous = true;
2911 } else {
2912 ZeroArgCallReturnTy = OverloadDecl->getReturnType();
2913 IsMV = OverloadDecl->isCPUDispatchMultiVersion() ||
2914 OverloadDecl->isCPUSpecificMultiVersion();
2915 }
2916 }
2917 }
2918 }
2919
2920 // If it's not a member, use better machinery to try to resolve the call
2921 if (!IsMemExpr)
2922 return !ZeroArgCallReturnTy.isNull();
2923 }
2924
2925 // Attempt to call the member with no arguments - this will correctly handle
2926 // member templates with defaults/deduction of template arguments, overloads
2927 // with default arguments, etc.
2928 if (IsMemExpr && !E.isTypeDependent()) {
2929 Sema::TentativeAnalysisScope Trap(*this);
2930 ExprResult R = BuildCallToMemberFunction(S: nullptr, MemExpr: &E, LParenLoc: SourceLocation(), Args: {},
2931 RParenLoc: SourceLocation());
2932 if (R.isUsable()) {
2933 ZeroArgCallReturnTy = R.get()->getType();
2934 return true;
2935 }
2936 return false;
2937 }
2938
2939 if (const auto *DeclRef = dyn_cast<DeclRefExpr>(Val: E.IgnoreParens())) {
2940 if (const auto *Fun = dyn_cast<FunctionDecl>(Val: DeclRef->getDecl())) {
2941 if (Fun->getMinRequiredArguments() == 0)
2942 ZeroArgCallReturnTy = Fun->getReturnType();
2943 return true;
2944 }
2945 }
2946
2947 // We don't have an expression that's convenient to get a FunctionDecl from,
2948 // but we can at least check if the type is "function of 0 arguments".
2949 QualType ExprTy = E.getType();
2950 const FunctionType *FunTy = nullptr;
2951 QualType PointeeTy = ExprTy->getPointeeType();
2952 if (!PointeeTy.isNull())
2953 FunTy = PointeeTy->getAs<FunctionType>();
2954 if (!FunTy)
2955 FunTy = ExprTy->getAs<FunctionType>();
2956
2957 if (const auto *FPT = dyn_cast_if_present<FunctionProtoType>(Val: FunTy)) {
2958 if (FPT->getNumParams() == 0)
2959 ZeroArgCallReturnTy = FunTy->getReturnType();
2960 return true;
2961 }
2962 return false;
2963}
2964
2965/// Give notes for a set of overloads.
2966///
2967/// A companion to tryExprAsCall. In cases when the name that the programmer
2968/// wrote was an overloaded function, we may be able to make some guesses about
2969/// plausible overloads based on their return types; such guesses can be handed
2970/// off to this method to be emitted as notes.
2971///
2972/// \param Overloads - The overloads to note.
2973/// \param FinalNoteLoc - If we've suppressed printing some overloads due to
2974/// -fshow-overloads=best, this is the location to attach to the note about too
2975/// many candidates. Typically this will be the location of the original
2976/// ill-formed expression.
2977static void noteOverloads(Sema &S, const UnresolvedSetImpl &Overloads,
2978 const SourceLocation FinalNoteLoc) {
2979 unsigned ShownOverloads = 0;
2980 unsigned SuppressedOverloads = 0;
2981 for (UnresolvedSetImpl::iterator It = Overloads.begin(),
2982 DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
2983 if (ShownOverloads >= S.Diags.getNumOverloadCandidatesToShow()) {
2984 ++SuppressedOverloads;
2985 continue;
2986 }
2987
2988 const NamedDecl *Fn = (*It)->getUnderlyingDecl();
2989 // Don't print overloads for non-default multiversioned functions.
2990 if (const auto *FD = Fn->getAsFunction()) {
2991 if (FD->isMultiVersion() && FD->hasAttr<TargetAttr>() &&
2992 !FD->getAttr<TargetAttr>()->isDefaultVersion())
2993 continue;
2994 if (FD->isMultiVersion() && FD->hasAttr<TargetVersionAttr>() &&
2995 !FD->getAttr<TargetVersionAttr>()->isDefaultVersion())
2996 continue;
2997 }
2998 S.Diag(Loc: Fn->getLocation(), DiagID: diag::note_possible_target_of_call);
2999 ++ShownOverloads;
3000 }
3001
3002 S.Diags.overloadCandidatesShown(N: ShownOverloads);
3003
3004 if (SuppressedOverloads)
3005 S.Diag(Loc: FinalNoteLoc, DiagID: diag::note_ovl_too_many_candidates)
3006 << SuppressedOverloads;
3007}
3008
3009static void notePlausibleOverloads(Sema &S, SourceLocation Loc,
3010 const UnresolvedSetImpl &Overloads,
3011 bool (*IsPlausibleResult)(QualType)) {
3012 if (!IsPlausibleResult)
3013 return noteOverloads(S, Overloads, FinalNoteLoc: Loc);
3014
3015 UnresolvedSet<2> PlausibleOverloads;
3016 for (OverloadExpr::decls_iterator It = Overloads.begin(),
3017 DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
3018 const auto *OverloadDecl = cast<FunctionDecl>(Val: *It);
3019 QualType OverloadResultTy = OverloadDecl->getReturnType();
3020 if (IsPlausibleResult(OverloadResultTy))
3021 PlausibleOverloads.addDecl(D: It.getDecl());
3022 }
3023 noteOverloads(S, Overloads: PlausibleOverloads, FinalNoteLoc: Loc);
3024}
3025
3026/// Determine whether the given expression can be called by just
3027/// putting parentheses after it. Notably, expressions with unary
3028/// operators can't be because the unary operator will start parsing
3029/// outside the call.
3030static bool IsCallableWithAppend(const Expr *E) {
3031 E = E->IgnoreImplicit();
3032 return (!isa<CStyleCastExpr>(Val: E) &&
3033 !isa<UnaryOperator>(Val: E) &&
3034 !isa<BinaryOperator>(Val: E) &&
3035 !isa<CXXOperatorCallExpr>(Val: E));
3036}
3037
3038static bool IsCPUDispatchCPUSpecificMultiVersion(const Expr *E) {
3039 if (const auto *UO = dyn_cast<UnaryOperator>(Val: E))
3040 E = UO->getSubExpr();
3041
3042 if (const auto *ULE = dyn_cast<UnresolvedLookupExpr>(Val: E)) {
3043 if (ULE->getNumDecls() == 0)
3044 return false;
3045
3046 const NamedDecl *ND = *ULE->decls_begin();
3047 if (const auto *FD = dyn_cast<FunctionDecl>(Val: ND))
3048 return FD->isCPUDispatchMultiVersion() || FD->isCPUSpecificMultiVersion();
3049 }
3050 return false;
3051}
3052
3053bool Sema::tryToRecoverWithCall(ExprResult &E, const PartialDiagnostic &PD,
3054 bool ForceComplain,
3055 bool (*IsPlausibleResult)(QualType)) {
3056 SourceLocation Loc = E.get()->getExprLoc();
3057 SourceRange Range = E.get()->getSourceRange();
3058 UnresolvedSet<4> Overloads;
3059
3060 // If this is a SFINAE context, don't try anything that might trigger ADL
3061 // prematurely.
3062 if (!isSFINAEContext()) {
3063 QualType ZeroArgCallTy;
3064 if (tryExprAsCall(E&: *E.get(), ZeroArgCallReturnTy&: ZeroArgCallTy, OverloadSet&: Overloads) &&
3065 !ZeroArgCallTy.isNull() &&
3066 (!IsPlausibleResult || IsPlausibleResult(ZeroArgCallTy))) {
3067 // At this point, we know E is potentially callable with 0
3068 // arguments and that it returns something of a reasonable type,
3069 // so we can emit a fixit and carry on pretending that E was
3070 // actually a CallExpr.
3071 SourceLocation ParenInsertionLoc = getLocForEndOfToken(Loc: Range.getEnd());
3072 bool IsMV = IsCPUDispatchCPUSpecificMultiVersion(E: E.get());
3073 Diag(Loc, PD) << /*zero-arg*/ 1 << IsMV << Range
3074 << (IsCallableWithAppend(E: E.get())
3075 ? FixItHint::CreateInsertion(InsertionLoc: ParenInsertionLoc,
3076 Code: "()")
3077 : FixItHint());
3078 if (!IsMV)
3079 notePlausibleOverloads(S&: *this, Loc, Overloads, IsPlausibleResult);
3080
3081 // FIXME: Try this before emitting the fixit, and suppress diagnostics
3082 // while doing so.
3083 E = BuildCallExpr(S: nullptr, Fn: E.get(), LParenLoc: Range.getEnd(), ArgExprs: {},
3084 RParenLoc: Range.getEnd().getLocWithOffset(Offset: 1));
3085 return true;
3086 }
3087 }
3088 if (!ForceComplain) return false;
3089
3090 bool IsMV = IsCPUDispatchCPUSpecificMultiVersion(E: E.get());
3091 Diag(Loc, PD) << /*not zero-arg*/ 0 << IsMV << Range;
3092 if (!IsMV)
3093 notePlausibleOverloads(S&: *this, Loc, Overloads, IsPlausibleResult);
3094 E = ExprError();
3095 return true;
3096}
3097
3098IdentifierInfo *Sema::getSuperIdentifier() const {
3099 if (!Ident_super)
3100 Ident_super = &Context.Idents.get(Name: "super");
3101 return Ident_super;
3102}
3103
3104void Sema::PushCapturedRegionScope(Scope *S, CapturedDecl *CD, RecordDecl *RD,
3105 CapturedRegionKind K,
3106 unsigned OpenMPCaptureLevel) {
3107 auto *CSI = new CapturedRegionScopeInfo(
3108 getDiagnostics(), S, CD, RD, CD->getContextParam(), K,
3109 (getLangOpts().OpenMP && K == CR_OpenMP)
3110 ? OpenMP().getOpenMPNestingLevel()
3111 : 0,
3112 OpenMPCaptureLevel);
3113 CSI->ReturnType = Context.VoidTy;
3114 FunctionScopes.push_back(Elt: CSI);
3115 CapturingFunctionScopes++;
3116}
3117
3118CapturedRegionScopeInfo *Sema::getCurCapturedRegion() {
3119 if (FunctionScopes.empty())
3120 return nullptr;
3121
3122 return dyn_cast<CapturedRegionScopeInfo>(Val: FunctionScopes.back());
3123}
3124
3125const llvm::MapVector<FieldDecl *, Sema::DeleteLocs> &
3126Sema::getMismatchingDeleteExpressions() const {
3127 return DeleteExprs;
3128}
3129
3130Sema::FPFeaturesStateRAII::FPFeaturesStateRAII(Sema &S)
3131 : S(S), OldFPFeaturesState(S.CurFPFeatures),
3132 OldOverrides(S.FpPragmaStack.CurrentValue),
3133 OldEvalMethod(S.PP.getCurrentFPEvalMethod()),
3134 OldFPPragmaLocation(S.PP.getLastFPEvalPragmaLocation()) {}
3135
3136Sema::FPFeaturesStateRAII::~FPFeaturesStateRAII() {
3137 S.CurFPFeatures = OldFPFeaturesState;
3138 S.FpPragmaStack.CurrentValue = OldOverrides;
3139 S.PP.setCurrentFPEvalMethod(PragmaLoc: OldFPPragmaLocation, Val: OldEvalMethod);
3140}
3141
3142bool Sema::isDeclaratorFunctionLike(Declarator &D) {
3143 assert(D.getCXXScopeSpec().isSet() &&
3144 "can only be called for qualified names");
3145
3146 auto LR = LookupResult(*this, D.getIdentifier(), D.getBeginLoc(),
3147 LookupOrdinaryName, forRedeclarationInCurContext());
3148 DeclContext *DC = computeDeclContext(SS: D.getCXXScopeSpec(),
3149 EnteringContext: !D.getDeclSpec().isFriendSpecified());
3150 if (!DC)
3151 return false;
3152
3153 LookupQualifiedName(R&: LR, LookupCtx: DC);
3154 bool Result = llvm::all_of(Range&: LR, P: [](Decl *Dcl) {
3155 if (NamedDecl *ND = dyn_cast<NamedDecl>(Val: Dcl)) {
3156 ND = ND->getUnderlyingDecl();
3157 return isa<FunctionDecl>(Val: ND) || isa<FunctionTemplateDecl>(Val: ND) ||
3158 isa<UsingDecl>(Val: ND);
3159 }
3160 return false;
3161 });
3162 return Result;
3163}
3164
3165Attr *Sema::CreateAnnotationAttr(const AttributeCommonInfo &CI, StringRef Annot,
3166 MutableArrayRef<Expr *> Args) {
3167
3168 auto *A = AnnotateAttr::Create(Ctx&: Context, Annotation: Annot, Args: Args.data(), ArgsSize: Args.size(), CommonInfo: CI);
3169 if (!ConstantFoldAttrArgs(
3170 CI, Args: MutableArrayRef<Expr *>(A->args_begin(), A->args_end()))) {
3171 return nullptr;
3172 }
3173 return A;
3174}
3175
3176Attr *Sema::CreateAnnotationAttr(const ParsedAttr &AL) {
3177 // Make sure that there is a string literal as the annotation's first
3178 // argument.
3179 StringRef Str;
3180 if (!checkStringLiteralArgumentAttr(Attr: AL, ArgNum: 0, Str))
3181 return nullptr;
3182
3183 llvm::SmallVector<Expr *, 4> Args;
3184 Args.reserve(N: AL.getNumArgs() - 1);
3185 for (unsigned Idx = 1; Idx < AL.getNumArgs(); Idx++) {
3186 assert(!AL.isArgIdent(Idx));
3187 Args.push_back(Elt: AL.getArgAsExpr(Arg: Idx));
3188 }
3189
3190 return CreateAnnotationAttr(CI: AL, Annot: Str, Args);
3191}
3192