1//===--- Sema.cpp - AST Builder and Semantic Analysis Implementation ------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file implements the actions class which performs semantic analysis and
10// builds an AST out of a parse stream.
11//
12//===----------------------------------------------------------------------===//
13
14#include "UsedDeclVisitor.h"
15#include "clang/AST/ASTContext.h"
16#include "clang/AST/ASTDiagnostic.h"
17#include "clang/AST/Decl.h"
18#include "clang/AST/DeclCXX.h"
19#include "clang/AST/DeclFriend.h"
20#include "clang/AST/DeclObjC.h"
21#include "clang/AST/Expr.h"
22#include "clang/AST/ExprCXX.h"
23#include "clang/AST/PrettyDeclStackTrace.h"
24#include "clang/AST/StmtCXX.h"
25#include "clang/AST/TypeOrdering.h"
26#include "clang/Basic/DarwinSDKInfo.h"
27#include "clang/Basic/DiagnosticOptions.h"
28#include "clang/Basic/PartialDiagnostic.h"
29#include "clang/Basic/SourceManager.h"
30#include "clang/Basic/TargetInfo.h"
31#include "clang/Lex/HeaderSearch.h"
32#include "clang/Lex/HeaderSearchOptions.h"
33#include "clang/Lex/Preprocessor.h"
34#include "clang/Sema/CXXFieldCollector.h"
35#include "clang/Sema/EnterExpressionEvaluationContext.h"
36#include "clang/Sema/ExternalSemaSource.h"
37#include "clang/Sema/Initialization.h"
38#include "clang/Sema/MultiplexExternalSemaSource.h"
39#include "clang/Sema/ObjCMethodList.h"
40#include "clang/Sema/RISCVIntrinsicManager.h"
41#include "clang/Sema/Scope.h"
42#include "clang/Sema/ScopeInfo.h"
43#include "clang/Sema/SemaAMDGPU.h"
44#include "clang/Sema/SemaARM.h"
45#include "clang/Sema/SemaAVR.h"
46#include "clang/Sema/SemaBPF.h"
47#include "clang/Sema/SemaCUDA.h"
48#include "clang/Sema/SemaCodeCompletion.h"
49#include "clang/Sema/SemaConsumer.h"
50#include "clang/Sema/SemaDirectX.h"
51#include "clang/Sema/SemaHLSL.h"
52#include "clang/Sema/SemaHexagon.h"
53#include "clang/Sema/SemaLoongArch.h"
54#include "clang/Sema/SemaM68k.h"
55#include "clang/Sema/SemaMIPS.h"
56#include "clang/Sema/SemaMSP430.h"
57#include "clang/Sema/SemaNVPTX.h"
58#include "clang/Sema/SemaObjC.h"
59#include "clang/Sema/SemaOpenACC.h"
60#include "clang/Sema/SemaOpenCL.h"
61#include "clang/Sema/SemaOpenMP.h"
62#include "clang/Sema/SemaPPC.h"
63#include "clang/Sema/SemaPseudoObject.h"
64#include "clang/Sema/SemaRISCV.h"
65#include "clang/Sema/SemaSPIRV.h"
66#include "clang/Sema/SemaSYCL.h"
67#include "clang/Sema/SemaSwift.h"
68#include "clang/Sema/SemaSystemZ.h"
69#include "clang/Sema/SemaWasm.h"
70#include "clang/Sema/SemaX86.h"
71#include "clang/Sema/TemplateDeduction.h"
72#include "clang/Sema/TemplateInstCallback.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 // If one of the analysis-based diagnostics was enabled while processing
231 // a function, we want to note it in the analysis-based warnings so they
232 // can be run at the end of the function body even if the analysis warnings
233 // are disabled at that point.
234 SmallVector<diag::kind, 256> GroupDiags;
235 diag::Flavor Flavor =
236 Str[1] == 'W' ? diag::Flavor::WarningOrError : diag::Flavor::Remark;
237 StringRef Group = Str.substr(Start: 2);
238
239 if (S->PP.getDiagnostics().getDiagnosticIDs()->getDiagnosticsInGroup(
240 Flavor, Group, Diags&: GroupDiags))
241 return;
242
243 for (diag::kind K : GroupDiags) {
244 // Note: the cases in this switch should be kept in sync with the
245 // diagnostics in AnalysisBasedWarnings::getPolicyInEffectAt().
246 AnalysisBasedWarnings::Policy &Override =
247 S->AnalysisWarnings.getPolicyOverrides();
248 switch (K) {
249 default: break;
250 case diag::warn_unreachable:
251 case diag::warn_unreachable_break:
252 case diag::warn_unreachable_return:
253 case diag::warn_unreachable_loop_increment:
254 Override.enableCheckUnreachable = true;
255 break;
256 case diag::warn_double_lock:
257 Override.enableThreadSafetyAnalysis = true;
258 break;
259 case diag::warn_use_in_invalid_state:
260 Override.enableConsumedAnalysis = true;
261 break;
262 }
263 }
264 }
265};
266
267} // end namespace sema
268} // end namespace clang
269
270const unsigned Sema::MaxAlignmentExponent;
271const uint64_t Sema::MaximumAlignment;
272
273Sema::Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
274 TranslationUnitKind TUKind, CodeCompleteConsumer *CodeCompleter)
275 : SemaBase(*this), CollectStats(false), TUKind(TUKind),
276 CurFPFeatures(pp.getLangOpts()), LangOpts(pp.getLangOpts()), PP(pp),
277 Context(ctxt), Consumer(consumer), Diags(PP.getDiagnostics()),
278 SourceMgr(PP.getSourceManager()), APINotes(SourceMgr, LangOpts),
279 AnalysisWarnings(*this), ThreadSafetyDeclCache(nullptr),
280 LateTemplateParser(nullptr), OpaqueParser(nullptr), CurContext(nullptr),
281 ExternalSource(nullptr), StackHandler(Diags), CurScope(nullptr),
282 Ident_super(nullptr), AMDGPUPtr(std::make_unique<SemaAMDGPU>(args&: *this)),
283 ARMPtr(std::make_unique<SemaARM>(args&: *this)),
284 AVRPtr(std::make_unique<SemaAVR>(args&: *this)),
285 BPFPtr(std::make_unique<SemaBPF>(args&: *this)),
286 CodeCompletionPtr(
287 std::make_unique<SemaCodeCompletion>(args&: *this, args&: CodeCompleter)),
288 CUDAPtr(std::make_unique<SemaCUDA>(args&: *this)),
289 DirectXPtr(std::make_unique<SemaDirectX>(args&: *this)),
290 HLSLPtr(std::make_unique<SemaHLSL>(args&: *this)),
291 HexagonPtr(std::make_unique<SemaHexagon>(args&: *this)),
292 LoongArchPtr(std::make_unique<SemaLoongArch>(args&: *this)),
293 M68kPtr(std::make_unique<SemaM68k>(args&: *this)),
294 MIPSPtr(std::make_unique<SemaMIPS>(args&: *this)),
295 MSP430Ptr(std::make_unique<SemaMSP430>(args&: *this)),
296 NVPTXPtr(std::make_unique<SemaNVPTX>(args&: *this)),
297 ObjCPtr(std::make_unique<SemaObjC>(args&: *this)),
298 OpenACCPtr(std::make_unique<SemaOpenACC>(args&: *this)),
299 OpenCLPtr(std::make_unique<SemaOpenCL>(args&: *this)),
300 OpenMPPtr(std::make_unique<SemaOpenMP>(args&: *this)),
301 PPCPtr(std::make_unique<SemaPPC>(args&: *this)),
302 PseudoObjectPtr(std::make_unique<SemaPseudoObject>(args&: *this)),
303 RISCVPtr(std::make_unique<SemaRISCV>(args&: *this)),
304 SPIRVPtr(std::make_unique<SemaSPIRV>(args&: *this)),
305 SYCLPtr(std::make_unique<SemaSYCL>(args&: *this)),
306 SwiftPtr(std::make_unique<SemaSwift>(args&: *this)),
307 SystemZPtr(std::make_unique<SemaSystemZ>(args&: *this)),
308 WasmPtr(std::make_unique<SemaWasm>(args&: *this)),
309 X86Ptr(std::make_unique<SemaX86>(args&: *this)),
310 MSPointerToMemberRepresentationMethod(
311 LangOpts.getMSPointerToMemberRepresentationMethod()),
312 MSStructPragmaOn(false), VtorDispStack(LangOpts.getVtorDispMode()),
313 AlignPackStack(AlignPackInfo(getLangOpts().XLPragmaPack)),
314 DataSegStack(nullptr), BSSSegStack(nullptr), ConstSegStack(nullptr),
315 CodeSegStack(nullptr), StrictGuardStackCheckStack(false),
316 FpPragmaStack(FPOptionsOverride()), CurInitSeg(nullptr),
317 VisContext(nullptr), PragmaAttributeCurrentTargetDecl(nullptr),
318 StdCoroutineTraitsCache(nullptr), IdResolver(pp),
319 OriginalLexicalContext(nullptr), StdInitializerList(nullptr),
320 StdTypeIdentity(nullptr),
321 FullyCheckedComparisonCategories(
322 static_cast<unsigned>(ComparisonCategoryType::Last) + 1),
323 StdSourceLocationImplDecl(nullptr), CXXTypeInfoDecl(nullptr),
324 GlobalNewDeleteDeclared(false), DisableTypoCorrection(false),
325 TyposCorrected(0), IsBuildingRecoveryCallExpr(false),
326 CurrentInstantiationScope(nullptr), NonInstantiationEntries(0),
327 ArgPackSubstIndex(std::nullopt), SatisfactionCache(Context) {
328 assert(pp.TUKind == TUKind);
329 TUScope = nullptr;
330
331 LoadedExternalKnownNamespaces = false;
332 for (unsigned I = 0; I != NSAPI::NumNSNumberLiteralMethods; ++I)
333 ObjC().NSNumberLiteralMethods[I] = nullptr;
334
335 if (getLangOpts().ObjC)
336 ObjC().NSAPIObj.reset(p: new NSAPI(Context));
337
338 if (getLangOpts().CPlusPlus)
339 FieldCollector.reset(p: new CXXFieldCollector());
340
341 // Tell diagnostics how to render things from the AST library.
342 Diags.SetArgToStringFn(Fn: &FormatASTNodeDiagnosticArgument, Cookie: &Context);
343
344 // This evaluation context exists to ensure that there's always at least one
345 // valid evaluation context available. It is never removed from the
346 // evaluation stack.
347 ExprEvalContexts.emplace_back(
348 Args: ExpressionEvaluationContext::PotentiallyEvaluated, Args: 0, Args: CleanupInfo{},
349 Args: nullptr, Args: ExpressionEvaluationContextRecord::EK_Other);
350
351 // Initialization of data sharing attributes stack for OpenMP
352 OpenMP().InitDataSharingAttributesStack();
353
354 std::unique_ptr<sema::SemaPPCallbacks> Callbacks =
355 std::make_unique<sema::SemaPPCallbacks>();
356 SemaPPCallbackHandler = Callbacks.get();
357 PP.addPPCallbacks(C: std::move(Callbacks));
358 SemaPPCallbackHandler->set(*this);
359
360 CurFPFeatures.setFPEvalMethod(PP.getCurrentFPEvalMethod());
361}
362
363// Anchor Sema's type info to this TU.
364void Sema::anchor() {}
365
366void Sema::addImplicitTypedef(StringRef Name, QualType T) {
367 DeclarationName DN = &Context.Idents.get(Name);
368 if (IdResolver.begin(Name: DN) == IdResolver.end())
369 PushOnScopeChains(D: Context.buildImplicitTypedef(T, Name), S: TUScope);
370}
371
372void Sema::Initialize() {
373 // Create BuiltinVaListDecl *before* ExternalSemaSource::InitializeSema(this)
374 // because during initialization ASTReader can emit globals that require
375 // name mangling. And the name mangling uses BuiltinVaListDecl.
376 if (Context.getTargetInfo().hasBuiltinMSVaList())
377 (void)Context.getBuiltinMSVaListDecl();
378 (void)Context.getBuiltinVaListDecl();
379
380 if (SemaConsumer *SC = dyn_cast<SemaConsumer>(Val: &Consumer))
381 SC->InitializeSema(S&: *this);
382
383 // Tell the external Sema source about this Sema object.
384 if (ExternalSemaSource *ExternalSema
385 = dyn_cast_or_null<ExternalSemaSource>(Val: Context.getExternalSource()))
386 ExternalSema->InitializeSema(S&: *this);
387
388 // This needs to happen after ExternalSemaSource::InitializeSema(this) or we
389 // will not be able to merge any duplicate __va_list_tag decls correctly.
390 VAListTagName = PP.getIdentifierInfo(Name: "__va_list_tag");
391
392 if (!TUScope)
393 return;
394
395 // Initialize predefined 128-bit integer types, if needed.
396 if (Context.getTargetInfo().hasInt128Type() ||
397 (Context.getAuxTargetInfo() &&
398 Context.getAuxTargetInfo()->hasInt128Type())) {
399 // If either of the 128-bit integer types are unavailable to name lookup,
400 // define them now.
401 DeclarationName Int128 = &Context.Idents.get(Name: "__int128_t");
402 if (IdResolver.begin(Name: Int128) == IdResolver.end())
403 PushOnScopeChains(D: Context.getInt128Decl(), S: TUScope);
404
405 DeclarationName UInt128 = &Context.Idents.get(Name: "__uint128_t");
406 if (IdResolver.begin(Name: UInt128) == IdResolver.end())
407 PushOnScopeChains(D: Context.getUInt128Decl(), S: TUScope);
408 }
409
410
411 // Initialize predefined Objective-C types:
412 if (getLangOpts().ObjC) {
413 // If 'SEL' does not yet refer to any declarations, make it refer to the
414 // predefined 'SEL'.
415 DeclarationName SEL = &Context.Idents.get(Name: "SEL");
416 if (IdResolver.begin(Name: SEL) == IdResolver.end())
417 PushOnScopeChains(D: Context.getObjCSelDecl(), S: TUScope);
418
419 // If 'id' does not yet refer to any declarations, make it refer to the
420 // predefined 'id'.
421 DeclarationName Id = &Context.Idents.get(Name: "id");
422 if (IdResolver.begin(Name: Id) == IdResolver.end())
423 PushOnScopeChains(D: Context.getObjCIdDecl(), S: TUScope);
424
425 // Create the built-in typedef for 'Class'.
426 DeclarationName Class = &Context.Idents.get(Name: "Class");
427 if (IdResolver.begin(Name: Class) == IdResolver.end())
428 PushOnScopeChains(D: Context.getObjCClassDecl(), S: TUScope);
429
430 // Create the built-in forward declaratino for 'Protocol'.
431 DeclarationName Protocol = &Context.Idents.get(Name: "Protocol");
432 if (IdResolver.begin(Name: Protocol) == IdResolver.end())
433 PushOnScopeChains(D: Context.getObjCProtocolDecl(), S: TUScope);
434 }
435
436 // Create the internal type for the *StringMakeConstantString builtins.
437 DeclarationName ConstantString = &Context.Idents.get(Name: "__NSConstantString");
438 if (IdResolver.begin(Name: ConstantString) == IdResolver.end())
439 PushOnScopeChains(D: Context.getCFConstantStringDecl(), S: TUScope);
440
441 // Initialize Microsoft "predefined C++ types".
442 if (getLangOpts().MSVCCompat) {
443 if (getLangOpts().CPlusPlus &&
444 IdResolver.begin(Name: &Context.Idents.get(Name: "type_info")) == IdResolver.end())
445 PushOnScopeChains(D: Context.getMSTypeInfoTagDecl(), S: TUScope);
446
447 addImplicitTypedef(Name: "size_t", T: Context.getSizeType());
448 }
449
450 // Initialize predefined OpenCL types and supported extensions and (optional)
451 // core features.
452 if (getLangOpts().OpenCL) {
453 getOpenCLOptions().addSupport(
454 FeaturesMap: Context.getTargetInfo().getSupportedOpenCLOpts(), Opts: getLangOpts());
455 addImplicitTypedef(Name: "sampler_t", T: Context.OCLSamplerTy);
456 addImplicitTypedef(Name: "event_t", T: Context.OCLEventTy);
457 auto OCLCompatibleVersion = getLangOpts().getOpenCLCompatibleVersion();
458 if (OCLCompatibleVersion >= 200) {
459 if (getLangOpts().OpenCLCPlusPlus || getLangOpts().Blocks) {
460 addImplicitTypedef(Name: "clk_event_t", T: Context.OCLClkEventTy);
461 addImplicitTypedef(Name: "queue_t", T: Context.OCLQueueTy);
462 }
463 if (getLangOpts().OpenCLPipes)
464 addImplicitTypedef(Name: "reserve_id_t", T: Context.OCLReserveIDTy);
465 addImplicitTypedef(Name: "atomic_int", T: Context.getAtomicType(T: Context.IntTy));
466 addImplicitTypedef(Name: "atomic_uint",
467 T: Context.getAtomicType(T: Context.UnsignedIntTy));
468 addImplicitTypedef(Name: "atomic_float",
469 T: Context.getAtomicType(T: Context.FloatTy));
470 // OpenCLC v2.0, s6.13.11.6 requires that atomic_flag is implemented as
471 // 32-bit integer and OpenCLC v2.0, s6.1.1 int is always 32-bit wide.
472 addImplicitTypedef(Name: "atomic_flag", T: Context.getAtomicType(T: Context.IntTy));
473
474
475 // OpenCL v2.0 s6.13.11.6:
476 // - The atomic_long and atomic_ulong types are supported if the
477 // cl_khr_int64_base_atomics and cl_khr_int64_extended_atomics
478 // extensions are supported.
479 // - The atomic_double type is only supported if double precision
480 // is supported and the cl_khr_int64_base_atomics and
481 // cl_khr_int64_extended_atomics extensions are supported.
482 // - If the device address space is 64-bits, the data types
483 // atomic_intptr_t, atomic_uintptr_t, atomic_size_t and
484 // atomic_ptrdiff_t are supported if the cl_khr_int64_base_atomics and
485 // cl_khr_int64_extended_atomics extensions are supported.
486
487 auto AddPointerSizeDependentTypes = [&]() {
488 auto AtomicSizeT = Context.getAtomicType(T: Context.getSizeType());
489 auto AtomicIntPtrT = Context.getAtomicType(T: Context.getIntPtrType());
490 auto AtomicUIntPtrT = Context.getAtomicType(T: Context.getUIntPtrType());
491 auto AtomicPtrDiffT =
492 Context.getAtomicType(T: Context.getPointerDiffType());
493 addImplicitTypedef(Name: "atomic_size_t", T: AtomicSizeT);
494 addImplicitTypedef(Name: "atomic_intptr_t", T: AtomicIntPtrT);
495 addImplicitTypedef(Name: "atomic_uintptr_t", T: AtomicUIntPtrT);
496 addImplicitTypedef(Name: "atomic_ptrdiff_t", T: AtomicPtrDiffT);
497 };
498
499 if (Context.getTypeSize(T: Context.getSizeType()) == 32) {
500 AddPointerSizeDependentTypes();
501 }
502
503 if (getOpenCLOptions().isSupported(Ext: "cl_khr_fp16", LO: getLangOpts())) {
504 auto AtomicHalfT = Context.getAtomicType(T: Context.HalfTy);
505 addImplicitTypedef(Name: "atomic_half", T: AtomicHalfT);
506 }
507
508 std::vector<QualType> Atomic64BitTypes;
509 if (getOpenCLOptions().isSupported(Ext: "cl_khr_int64_base_atomics",
510 LO: getLangOpts()) &&
511 getOpenCLOptions().isSupported(Ext: "cl_khr_int64_extended_atomics",
512 LO: getLangOpts())) {
513 if (getOpenCLOptions().isSupported(Ext: "cl_khr_fp64", LO: getLangOpts())) {
514 auto AtomicDoubleT = Context.getAtomicType(T: Context.DoubleTy);
515 addImplicitTypedef(Name: "atomic_double", T: AtomicDoubleT);
516 Atomic64BitTypes.push_back(x: AtomicDoubleT);
517 }
518 auto AtomicLongT = Context.getAtomicType(T: Context.LongTy);
519 auto AtomicULongT = Context.getAtomicType(T: Context.UnsignedLongTy);
520 addImplicitTypedef(Name: "atomic_long", T: AtomicLongT);
521 addImplicitTypedef(Name: "atomic_ulong", T: AtomicULongT);
522
523
524 if (Context.getTypeSize(T: Context.getSizeType()) == 64) {
525 AddPointerSizeDependentTypes();
526 }
527 }
528 }
529
530#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
531 if (getOpenCLOptions().isSupported(#Ext, getLangOpts())) { \
532 addImplicitTypedef(#ExtType, Context.Id##Ty); \
533 }
534#include "clang/Basic/OpenCLExtensionTypes.def"
535 }
536
537 if (Context.getTargetInfo().hasAArch64ACLETypes() ||
538 (Context.getAuxTargetInfo() &&
539 Context.getAuxTargetInfo()->hasAArch64ACLETypes())) {
540#define SVE_TYPE(Name, Id, SingletonId) \
541 addImplicitTypedef(#Name, Context.SingletonId);
542#define NEON_VECTOR_TYPE(Name, BaseType, ElBits, NumEls, VectorKind) \
543 addImplicitTypedef( \
544 #Name, Context.getVectorType(Context.BaseType, NumEls, VectorKind));
545#include "clang/Basic/AArch64ACLETypes.def"
546 }
547
548 if (Context.getTargetInfo().getTriple().isPPC64()) {
549#define PPC_VECTOR_MMA_TYPE(Name, Id, Size) \
550 addImplicitTypedef(#Name, Context.Id##Ty);
551#include "clang/Basic/PPCTypes.def"
552#define PPC_VECTOR_VSX_TYPE(Name, Id, Size) \
553 addImplicitTypedef(#Name, Context.Id##Ty);
554#include "clang/Basic/PPCTypes.def"
555 }
556
557 if (Context.getTargetInfo().hasRISCVVTypes()) {
558#define RVV_TYPE(Name, Id, SingletonId) \
559 addImplicitTypedef(Name, Context.SingletonId);
560#include "clang/Basic/RISCVVTypes.def"
561 }
562
563 if (Context.getTargetInfo().getTriple().isWasm() &&
564 Context.getTargetInfo().hasFeature(Feature: "reference-types")) {
565#define WASM_TYPE(Name, Id, SingletonId) \
566 addImplicitTypedef(Name, Context.SingletonId);
567#include "clang/Basic/WebAssemblyReferenceTypes.def"
568 }
569
570 if (Context.getTargetInfo().getTriple().isAMDGPU() ||
571 (Context.getAuxTargetInfo() &&
572 Context.getAuxTargetInfo()->getTriple().isAMDGPU())) {
573#define AMDGPU_TYPE(Name, Id, SingletonId, Width, Align) \
574 addImplicitTypedef(Name, Context.SingletonId);
575#include "clang/Basic/AMDGPUTypes.def"
576 }
577
578 if (Context.getTargetInfo().hasBuiltinMSVaList()) {
579 DeclarationName MSVaList = &Context.Idents.get(Name: "__builtin_ms_va_list");
580 if (IdResolver.begin(Name: MSVaList) == IdResolver.end())
581 PushOnScopeChains(D: Context.getBuiltinMSVaListDecl(), S: TUScope);
582 }
583
584 DeclarationName BuiltinVaList = &Context.Idents.get(Name: "__builtin_va_list");
585 if (IdResolver.begin(Name: BuiltinVaList) == IdResolver.end())
586 PushOnScopeChains(D: Context.getBuiltinVaListDecl(), S: TUScope);
587}
588
589Sema::~Sema() {
590 assert(InstantiatingSpecializations.empty() &&
591 "failed to clean up an InstantiatingTemplate?");
592
593 if (VisContext) FreeVisContext();
594
595 // Kill all the active scopes.
596 for (sema::FunctionScopeInfo *FSI : FunctionScopes)
597 delete FSI;
598
599 // Tell the SemaConsumer to forget about us; we're going out of scope.
600 if (SemaConsumer *SC = dyn_cast<SemaConsumer>(Val: &Consumer))
601 SC->ForgetSema();
602
603 // Detach from the external Sema source.
604 if (ExternalSemaSource *ExternalSema
605 = dyn_cast_or_null<ExternalSemaSource>(Val: Context.getExternalSource()))
606 ExternalSema->ForgetSema();
607
608 // Delete cached satisfactions.
609 std::vector<ConstraintSatisfaction *> Satisfactions;
610 Satisfactions.reserve(n: SatisfactionCache.size());
611 for (auto &Node : SatisfactionCache)
612 Satisfactions.push_back(x: &Node);
613 for (auto *Node : Satisfactions)
614 delete Node;
615
616 threadSafety::threadSafetyCleanup(Cache: ThreadSafetyDeclCache);
617
618 // Destroys data sharing attributes stack for OpenMP
619 OpenMP().DestroyDataSharingAttributesStack();
620
621 // Detach from the PP callback handler which outlives Sema since it's owned
622 // by the preprocessor.
623 SemaPPCallbackHandler->reset();
624}
625
626void Sema::runWithSufficientStackSpace(SourceLocation Loc,
627 llvm::function_ref<void()> Fn) {
628 StackHandler.runWithSufficientStackSpace(Loc, Fn);
629}
630
631bool Sema::makeUnavailableInSystemHeader(SourceLocation loc,
632 UnavailableAttr::ImplicitReason reason) {
633 // If we're not in a function, it's an error.
634 FunctionDecl *fn = dyn_cast<FunctionDecl>(Val: CurContext);
635 if (!fn) return false;
636
637 // If we're in template instantiation, it's an error.
638 if (inTemplateInstantiation())
639 return false;
640
641 // If that function's not in a system header, it's an error.
642 if (!Context.getSourceManager().isInSystemHeader(Loc: loc))
643 return false;
644
645 // If the function is already unavailable, it's not an error.
646 if (fn->hasAttr<UnavailableAttr>()) return true;
647
648 fn->addAttr(A: UnavailableAttr::CreateImplicit(Ctx&: Context, Message: "", ImplicitReason: reason, Range: loc));
649 return true;
650}
651
652ASTMutationListener *Sema::getASTMutationListener() const {
653 return getASTConsumer().GetASTMutationListener();
654}
655
656void Sema::addExternalSource(IntrusiveRefCntPtr<ExternalSemaSource> E) {
657 assert(E && "Cannot use with NULL ptr");
658
659 if (!ExternalSource) {
660 ExternalSource = std::move(E);
661 return;
662 }
663
664 if (auto *Ex = dyn_cast<MultiplexExternalSemaSource>(Val: ExternalSource.get()))
665 Ex->AddSource(Source: std::move(E));
666 else
667 ExternalSource = llvm::makeIntrusiveRefCnt<MultiplexExternalSemaSource>(
668 A&: ExternalSource, A: std::move(E));
669}
670
671void Sema::PrintStats() const {
672 llvm::errs() << "\n*** Semantic Analysis Stats:\n";
673 if (SFINAETrap *Trap = getSFINAEContext())
674 llvm::errs() << int(Trap->hasErrorOccurred())
675 << " SFINAE diagnostics trapped.\n";
676
677 BumpAlloc.PrintStats();
678 AnalysisWarnings.PrintStats();
679}
680
681void Sema::diagnoseNullableToNonnullConversion(QualType DstType,
682 QualType SrcType,
683 SourceLocation Loc) {
684 std::optional<NullabilityKind> ExprNullability = SrcType->getNullability();
685 if (!ExprNullability || (*ExprNullability != NullabilityKind::Nullable &&
686 *ExprNullability != NullabilityKind::NullableResult))
687 return;
688
689 std::optional<NullabilityKind> TypeNullability = DstType->getNullability();
690 if (!TypeNullability || *TypeNullability != NullabilityKind::NonNull)
691 return;
692
693 Diag(Loc, DiagID: diag::warn_nullability_lost) << SrcType << DstType;
694}
695
696// Generate diagnostics when adding or removing effects in a type conversion.
697void Sema::diagnoseFunctionEffectConversion(QualType DstType, QualType SrcType,
698 SourceLocation Loc) {
699 const auto SrcFX = FunctionEffectsRef::get(QT: SrcType);
700 const auto DstFX = FunctionEffectsRef::get(QT: DstType);
701 if (SrcFX != DstFX) {
702 for (const auto &Diff : FunctionEffectDiffVector(SrcFX, DstFX)) {
703 if (Diff.shouldDiagnoseConversion(SrcType, SrcFX, DstType, DstFX))
704 Diag(Loc, DiagID: diag::warn_invalid_add_func_effects) << Diff.effectName();
705 }
706 }
707}
708
709void Sema::diagnoseZeroToNullptrConversion(CastKind Kind, const Expr *E) {
710 // nullptr only exists from C++11 on, so don't warn on its absence earlier.
711 if (!getLangOpts().CPlusPlus11)
712 return;
713
714 if (Kind != CK_NullToPointer && Kind != CK_NullToMemberPointer)
715 return;
716
717 const Expr *EStripped = E->IgnoreParenImpCasts();
718 if (EStripped->getType()->isNullPtrType())
719 return;
720 if (isa<GNUNullExpr>(Val: EStripped))
721 return;
722
723 if (Diags.isIgnored(DiagID: diag::warn_zero_as_null_pointer_constant,
724 Loc: E->getBeginLoc()))
725 return;
726
727 // Don't diagnose the conversion from a 0 literal to a null pointer argument
728 // in a synthesized call to operator<=>.
729 if (!CodeSynthesisContexts.empty() &&
730 CodeSynthesisContexts.back().Kind ==
731 CodeSynthesisContext::RewritingOperatorAsSpaceship)
732 return;
733
734 // Ignore null pointers in defaulted comparison operators.
735 FunctionDecl *FD = getCurFunctionDecl();
736 if (FD && FD->isDefaulted()) {
737 return;
738 }
739
740 // If it is a macro from system header, and if the macro name is not "NULL",
741 // do not warn.
742 // Note that uses of "NULL" will be ignored above on systems that define it
743 // as __null.
744 SourceLocation MaybeMacroLoc = E->getBeginLoc();
745 if (Diags.getSuppressSystemWarnings() &&
746 SourceMgr.isInSystemMacro(loc: MaybeMacroLoc) &&
747 !findMacroSpelling(loc&: MaybeMacroLoc, name: "NULL"))
748 return;
749
750 Diag(Loc: E->getBeginLoc(), DiagID: diag::warn_zero_as_null_pointer_constant)
751 << FixItHint::CreateReplacement(RemoveRange: E->getSourceRange(), Code: "nullptr");
752}
753
754/// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit cast.
755/// If there is already an implicit cast, merge into the existing one.
756/// The result is of the given category.
757ExprResult Sema::ImpCastExprToType(Expr *E, QualType Ty,
758 CastKind Kind, ExprValueKind VK,
759 const CXXCastPath *BasePath,
760 CheckedConversionKind CCK) {
761#ifndef NDEBUG
762 if (VK == VK_PRValue && !E->isPRValue()) {
763 switch (Kind) {
764 default:
765 llvm_unreachable(
766 ("can't implicitly cast glvalue to prvalue with this cast "
767 "kind: " +
768 std::string(CastExpr::getCastKindName(Kind)))
769 .c_str());
770 case CK_Dependent:
771 case CK_LValueToRValue:
772 case CK_ArrayToPointerDecay:
773 case CK_FunctionToPointerDecay:
774 case CK_ToVoid:
775 case CK_NonAtomicToAtomic:
776 case CK_HLSLArrayRValue:
777 case CK_HLSLAggregateSplatCast:
778 break;
779 }
780 }
781 assert((VK == VK_PRValue || Kind == CK_Dependent || !E->isPRValue()) &&
782 "can't cast prvalue to glvalue");
783#endif
784
785 diagnoseNullableToNonnullConversion(DstType: Ty, SrcType: E->getType(), Loc: E->getBeginLoc());
786 diagnoseZeroToNullptrConversion(Kind, E);
787 if (Context.hasAnyFunctionEffects() && !isCast(CCK) &&
788 Kind != CK_NullToPointer && Kind != CK_NullToMemberPointer)
789 diagnoseFunctionEffectConversion(DstType: Ty, SrcType: E->getType(), Loc: E->getBeginLoc());
790
791 QualType ExprTy = Context.getCanonicalType(T: E->getType());
792 QualType TypeTy = Context.getCanonicalType(T: Ty);
793
794 // This cast is used in place of a regular LValue to RValue cast for
795 // HLSL Array Parameter Types. It needs to be emitted even if
796 // ExprTy == TypeTy, except if E is an HLSLOutArgExpr
797 // Emitting a cast in that case will prevent HLSLOutArgExpr from
798 // being handled properly in EmitCallArg
799 if (Kind == CK_HLSLArrayRValue && !isa<HLSLOutArgExpr>(Val: E))
800 return ImplicitCastExpr::Create(Context, T: Ty, Kind, Operand: E, BasePath, Cat: VK,
801 FPO: CurFPFeatureOverrides());
802
803 if (ExprTy == TypeTy)
804 return E;
805
806 if (Kind == CK_ArrayToPointerDecay) {
807 // C++1z [conv.array]: The temporary materialization conversion is applied.
808 // We also use this to fuel C++ DR1213, which applies to C++11 onwards.
809 if (getLangOpts().CPlusPlus && E->isPRValue()) {
810 // The temporary is an lvalue in C++98 and an xvalue otherwise.
811 ExprResult Materialized = CreateMaterializeTemporaryExpr(
812 T: E->getType(), Temporary: E, BoundToLvalueReference: !getLangOpts().CPlusPlus11);
813 if (Materialized.isInvalid())
814 return ExprError();
815 E = Materialized.get();
816 }
817 // C17 6.7.1p6 footnote 124: The implementation can treat any register
818 // declaration simply as an auto declaration. However, whether or not
819 // addressable storage is actually used, the address of any part of an
820 // object declared with storage-class specifier register cannot be
821 // computed, either explicitly(by use of the unary & operator as discussed
822 // in 6.5.3.2) or implicitly(by converting an array name to a pointer as
823 // discussed in 6.3.2.1).Thus, the only operator that can be applied to an
824 // array declared with storage-class specifier register is sizeof.
825 if (VK == VK_PRValue && !getLangOpts().CPlusPlus && !E->isPRValue()) {
826 if (const auto *DRE = dyn_cast<DeclRefExpr>(Val: E)) {
827 if (const auto *VD = dyn_cast<VarDecl>(Val: DRE->getDecl())) {
828 if (VD->getStorageClass() == SC_Register) {
829 Diag(Loc: E->getExprLoc(), DiagID: diag::err_typecheck_address_of)
830 << /*register variable*/ 3 << E->getSourceRange();
831 return ExprError();
832 }
833 }
834 }
835 }
836 }
837
838 if (ImplicitCastExpr *ImpCast = dyn_cast<ImplicitCastExpr>(Val: E)) {
839 if (ImpCast->getCastKind() == Kind && (!BasePath || BasePath->empty())) {
840 ImpCast->setType(Ty);
841 ImpCast->setValueKind(VK);
842 return E;
843 }
844 }
845
846 bool IsExplicitCast = isa<CStyleCastExpr>(Val: E) || isa<CXXStaticCastExpr>(Val: E) ||
847 isa<CXXFunctionalCastExpr>(Val: E);
848
849 if ((Kind == CK_IntegralCast || Kind == CK_IntegralToBoolean ||
850 (Kind == CK_NoOp && E->getType()->isIntegerType() &&
851 Ty->isIntegerType())) &&
852 IsExplicitCast) {
853 if (const auto *SourceOBT = E->getType()->getAs<OverflowBehaviorType>()) {
854 if (Ty->isIntegerType() && !Ty->isOverflowBehaviorType()) {
855 Ty = Context.getOverflowBehaviorType(Kind: SourceOBT->getBehaviorKind(), Wrapped: Ty);
856 }
857 }
858 }
859
860 return ImplicitCastExpr::Create(Context, T: Ty, Kind, Operand: E, BasePath, Cat: VK,
861 FPO: CurFPFeatureOverrides());
862}
863
864CastKind Sema::ScalarTypeToBooleanCastKind(QualType ScalarTy) {
865 switch (ScalarTy->getScalarTypeKind()) {
866 case Type::STK_Bool: return CK_NoOp;
867 case Type::STK_CPointer: return CK_PointerToBoolean;
868 case Type::STK_BlockPointer: return CK_PointerToBoolean;
869 case Type::STK_ObjCObjectPointer: return CK_PointerToBoolean;
870 case Type::STK_MemberPointer: return CK_MemberPointerToBoolean;
871 case Type::STK_Integral: return CK_IntegralToBoolean;
872 case Type::STK_Floating: return CK_FloatingToBoolean;
873 case Type::STK_IntegralComplex: return CK_IntegralComplexToBoolean;
874 case Type::STK_FloatingComplex: return CK_FloatingComplexToBoolean;
875 case Type::STK_FixedPoint: return CK_FixedPointToBoolean;
876 }
877 llvm_unreachable("unknown scalar type kind");
878}
879
880/// Used to prune the decls of Sema's UnusedFileScopedDecls vector.
881static bool ShouldRemoveFromUnused(Sema *SemaRef, const DeclaratorDecl *D) {
882 if (D->getMostRecentDecl()->isUsed())
883 return true;
884
885 if (D->isExternallyVisible())
886 return true;
887
888 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Val: D)) {
889 // If this is a function template and none of its specializations is used,
890 // we should warn.
891 if (FunctionTemplateDecl *Template = FD->getDescribedFunctionTemplate())
892 for (const auto *Spec : Template->specializations())
893 if (ShouldRemoveFromUnused(SemaRef, D: Spec))
894 return true;
895
896 // UnusedFileScopedDecls stores the first declaration.
897 // The declaration may have become definition so check again.
898 const FunctionDecl *DeclToCheck;
899 if (FD->hasBody(Definition&: DeclToCheck))
900 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(D: DeclToCheck);
901
902 // Later redecls may add new information resulting in not having to warn,
903 // so check again.
904 DeclToCheck = FD->getMostRecentDecl();
905 if (DeclToCheck != FD)
906 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(D: DeclToCheck);
907 }
908
909 if (const VarDecl *VD = dyn_cast<VarDecl>(Val: D)) {
910 // If a variable usable in constant expressions is referenced,
911 // don't warn if it isn't used: if the value of a variable is required
912 // for the computation of a constant expression, it doesn't make sense to
913 // warn even if the variable isn't odr-used. (isReferenced doesn't
914 // precisely reflect that, but it's a decent approximation.)
915 if (VD->isReferenced() &&
916 VD->mightBeUsableInConstantExpressions(C: SemaRef->Context))
917 return true;
918
919 if (VarTemplateDecl *Template = VD->getDescribedVarTemplate())
920 // If this is a variable template and none of its specializations is used,
921 // we should warn.
922 for (const auto *Spec : Template->specializations())
923 if (ShouldRemoveFromUnused(SemaRef, D: Spec))
924 return true;
925
926 // UnusedFileScopedDecls stores the first declaration.
927 // The declaration may have become definition so check again.
928 const VarDecl *DeclToCheck = VD->getDefinition();
929 if (DeclToCheck)
930 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(D: DeclToCheck);
931
932 // Later redecls may add new information resulting in not having to warn,
933 // so check again.
934 DeclToCheck = VD->getMostRecentDecl();
935 if (DeclToCheck != VD)
936 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(D: DeclToCheck);
937 }
938
939 return false;
940}
941
942static bool isFunctionOrVarDeclExternC(const NamedDecl *ND) {
943 if (const auto *FD = dyn_cast<FunctionDecl>(Val: ND))
944 return FD->isExternC();
945 return cast<VarDecl>(Val: ND)->isExternC();
946}
947
948/// Determine whether ND is an external-linkage function or variable whose
949/// type has no linkage.
950bool Sema::isExternalWithNoLinkageType(const ValueDecl *VD) const {
951 // Note: it's not quite enough to check whether VD has UniqueExternalLinkage,
952 // because we also want to catch the case where its type has VisibleNoLinkage,
953 // which does not affect the linkage of VD.
954 return getLangOpts().CPlusPlus && VD->hasExternalFormalLinkage() &&
955 !isExternalFormalLinkage(L: VD->getType()->getLinkage()) &&
956 !isFunctionOrVarDeclExternC(ND: VD);
957}
958
959/// Obtains a sorted list of functions and variables that are undefined but
960/// ODR-used.
961void Sema::getUndefinedButUsed(
962 SmallVectorImpl<std::pair<NamedDecl *, SourceLocation> > &Undefined) {
963 for (const auto &UndefinedUse : UndefinedButUsed) {
964 NamedDecl *ND = UndefinedUse.first;
965
966 // Ignore attributes that have become invalid.
967 if (ND->isInvalidDecl()) continue;
968
969 // __attribute__((weakref)) is basically a definition.
970 if (ND->hasAttr<WeakRefAttr>()) continue;
971
972 if (isa<CXXDeductionGuideDecl>(Val: ND))
973 continue;
974
975 if (ND->hasAttr<DLLImportAttr>() || ND->hasAttr<DLLExportAttr>()) {
976 // An exported function will always be emitted when defined, so even if
977 // the function is inline, it doesn't have to be emitted in this TU. An
978 // imported function implies that it has been exported somewhere else.
979 continue;
980 }
981
982 if (const auto *FD = dyn_cast<FunctionDecl>(Val: ND)) {
983 if (FD->isDefined())
984 continue;
985 if (FD->isExternallyVisible() &&
986 !isExternalWithNoLinkageType(VD: FD) &&
987 !FD->getMostRecentDecl()->isInlined() &&
988 !FD->hasAttr<ExcludeFromExplicitInstantiationAttr>())
989 continue;
990 if (FD->getBuiltinID())
991 continue;
992 } else {
993 const auto *VD = cast<VarDecl>(Val: ND);
994 if (VD->hasDefinition() != VarDecl::DeclarationOnly)
995 continue;
996 if (VD->isExternallyVisible() &&
997 !isExternalWithNoLinkageType(VD) &&
998 !VD->getMostRecentDecl()->isInline() &&
999 !VD->hasAttr<ExcludeFromExplicitInstantiationAttr>())
1000 continue;
1001
1002 // Skip VarDecls that lack formal definitions but which we know are in
1003 // fact defined somewhere.
1004 if (VD->isKnownToBeDefined())
1005 continue;
1006 }
1007
1008 Undefined.push_back(Elt: std::make_pair(x&: ND, y: UndefinedUse.second));
1009 }
1010}
1011
1012/// checkUndefinedButUsed - Check for undefined objects with internal linkage
1013/// or that are inline.
1014static void checkUndefinedButUsed(Sema &S) {
1015 if (S.UndefinedButUsed.empty()) return;
1016
1017 // Collect all the still-undefined entities with internal linkage.
1018 SmallVector<std::pair<NamedDecl *, SourceLocation>, 16> Undefined;
1019 S.getUndefinedButUsed(Undefined);
1020 S.UndefinedButUsed.clear();
1021 if (Undefined.empty()) return;
1022
1023 for (const auto &Undef : Undefined) {
1024 ValueDecl *VD = cast<ValueDecl>(Val: Undef.first);
1025 SourceLocation UseLoc = Undef.second;
1026
1027 if (S.isExternalWithNoLinkageType(VD)) {
1028 // C++ [basic.link]p8:
1029 // A type without linkage shall not be used as the type of a variable
1030 // or function with external linkage unless
1031 // -- the entity has C language linkage
1032 // -- the entity is not odr-used or is defined in the same TU
1033 //
1034 // As an extension, accept this in cases where the type is externally
1035 // visible, since the function or variable actually can be defined in
1036 // another translation unit in that case.
1037 S.Diag(Loc: VD->getLocation(), DiagID: isExternallyVisible(L: VD->getType()->getLinkage())
1038 ? diag::ext_undefined_internal_type
1039 : diag::err_undefined_internal_type)
1040 << isa<VarDecl>(Val: VD) << VD;
1041 } else if (!VD->isExternallyVisible()) {
1042 // FIXME: We can promote this to an error. The function or variable can't
1043 // be defined anywhere else, so the program must necessarily violate the
1044 // one definition rule.
1045 bool IsImplicitBase = false;
1046 if (const auto *BaseD = dyn_cast<FunctionDecl>(Val: VD)) {
1047 auto *DVAttr = BaseD->getAttr<OMPDeclareVariantAttr>();
1048 if (DVAttr && !DVAttr->getTraitInfo().isExtensionActive(
1049 TP: llvm::omp::TraitProperty::
1050 implementation_extension_disable_implicit_base)) {
1051 const auto *Func = cast<FunctionDecl>(
1052 Val: cast<DeclRefExpr>(Val: DVAttr->getVariantFuncRef())->getDecl());
1053 IsImplicitBase = BaseD->isImplicit() &&
1054 Func->getIdentifier()->isMangledOpenMPVariantName();
1055 }
1056 }
1057 if (!S.getLangOpts().OpenMP || !IsImplicitBase)
1058 S.Diag(Loc: VD->getLocation(), DiagID: diag::warn_undefined_internal)
1059 << isa<VarDecl>(Val: VD) << VD;
1060 } else if (auto *FD = dyn_cast<FunctionDecl>(Val: VD)) {
1061 (void)FD;
1062 assert(FD->getMostRecentDecl()->isInlined() &&
1063 "used object requires definition but isn't inline or internal?");
1064 // FIXME: This is ill-formed; we should reject.
1065 S.Diag(Loc: VD->getLocation(), DiagID: diag::warn_undefined_inline) << VD;
1066 } else {
1067 assert(cast<VarDecl>(VD)->getMostRecentDecl()->isInline() &&
1068 "used var requires definition but isn't inline or internal?");
1069 S.Diag(Loc: VD->getLocation(), DiagID: diag::err_undefined_inline_var) << VD;
1070 }
1071 if (UseLoc.isValid())
1072 S.Diag(Loc: UseLoc, DiagID: diag::note_used_here);
1073 }
1074}
1075
1076void Sema::LoadExternalWeakUndeclaredIdentifiers() {
1077 if (!ExternalSource)
1078 return;
1079
1080 SmallVector<std::pair<IdentifierInfo *, WeakInfo>, 4> WeakIDs;
1081 ExternalSource->ReadWeakUndeclaredIdentifiers(WI&: WeakIDs);
1082 for (auto &WeakID : WeakIDs)
1083 (void)WeakUndeclaredIdentifiers[WeakID.first].insert(X: WeakID.second);
1084}
1085
1086
1087typedef llvm::DenseMap<const CXXRecordDecl*, bool> RecordCompleteMap;
1088
1089/// Returns true, if all methods and nested classes of the given
1090/// CXXRecordDecl are defined in this translation unit.
1091///
1092/// Should only be called from ActOnEndOfTranslationUnit so that all
1093/// definitions are actually read.
1094static bool MethodsAndNestedClassesComplete(const CXXRecordDecl *RD,
1095 RecordCompleteMap &MNCComplete) {
1096 RecordCompleteMap::iterator Cache = MNCComplete.find(Val: RD);
1097 if (Cache != MNCComplete.end())
1098 return Cache->second;
1099 if (!RD->isCompleteDefinition())
1100 return false;
1101 bool Complete = true;
1102 for (DeclContext::decl_iterator I = RD->decls_begin(),
1103 E = RD->decls_end();
1104 I != E && Complete; ++I) {
1105 if (const CXXMethodDecl *M = dyn_cast<CXXMethodDecl>(Val: *I))
1106 Complete = M->isDefined() || M->isDefaulted() ||
1107 (M->isPureVirtual() && !isa<CXXDestructorDecl>(Val: M));
1108 else if (const FunctionTemplateDecl *F = dyn_cast<FunctionTemplateDecl>(Val: *I))
1109 // If the template function is marked as late template parsed at this
1110 // point, it has not been instantiated and therefore we have not
1111 // performed semantic analysis on it yet, so we cannot know if the type
1112 // can be considered complete.
1113 Complete = !F->getTemplatedDecl()->isLateTemplateParsed() &&
1114 F->getTemplatedDecl()->isDefined();
1115 else if (const CXXRecordDecl *R = dyn_cast<CXXRecordDecl>(Val: *I)) {
1116 if (R->isInjectedClassName())
1117 continue;
1118 if (R->hasDefinition())
1119 Complete = MethodsAndNestedClassesComplete(RD: R->getDefinition(),
1120 MNCComplete);
1121 else
1122 Complete = false;
1123 }
1124 }
1125 MNCComplete[RD] = Complete;
1126 return Complete;
1127}
1128
1129/// Returns true, if the given CXXRecordDecl is fully defined in this
1130/// translation unit, i.e. all methods are defined or pure virtual and all
1131/// friends, friend functions and nested classes are fully defined in this
1132/// translation unit.
1133///
1134/// Should only be called from ActOnEndOfTranslationUnit so that all
1135/// definitions are actually read.
1136static bool IsRecordFullyDefined(const CXXRecordDecl *RD,
1137 RecordCompleteMap &RecordsComplete,
1138 RecordCompleteMap &MNCComplete) {
1139 RecordCompleteMap::iterator Cache = RecordsComplete.find(Val: RD);
1140 if (Cache != RecordsComplete.end())
1141 return Cache->second;
1142 bool Complete = MethodsAndNestedClassesComplete(RD, MNCComplete);
1143 for (CXXRecordDecl::friend_iterator I = RD->friend_begin(),
1144 E = RD->friend_end();
1145 I != E && Complete; ++I) {
1146 // Check if friend classes and methods are complete.
1147 if (TypeSourceInfo *TSI = (*I)->getFriendType()) {
1148 // Friend classes are available as the TypeSourceInfo of the FriendDecl.
1149 if (CXXRecordDecl *FriendD = TSI->getType()->getAsCXXRecordDecl())
1150 Complete = MethodsAndNestedClassesComplete(RD: FriendD, MNCComplete);
1151 else
1152 Complete = false;
1153 } else {
1154 // Friend functions are available through the NamedDecl of FriendDecl.
1155 if (const FunctionDecl *FD =
1156 dyn_cast<FunctionDecl>(Val: (*I)->getFriendDecl()))
1157 Complete = FD->isDefined();
1158 else
1159 // This is a template friend, give up.
1160 Complete = false;
1161 }
1162 }
1163 RecordsComplete[RD] = Complete;
1164 return Complete;
1165}
1166
1167void Sema::emitAndClearUnusedLocalTypedefWarnings() {
1168 if (ExternalSource)
1169 ExternalSource->ReadUnusedLocalTypedefNameCandidates(
1170 Decls&: UnusedLocalTypedefNameCandidates);
1171 for (const TypedefNameDecl *TD : UnusedLocalTypedefNameCandidates) {
1172 if (TD->isReferenced())
1173 continue;
1174 Diag(Loc: TD->getLocation(), DiagID: diag::warn_unused_local_typedef)
1175 << isa<TypeAliasDecl>(Val: TD) << TD->getDeclName();
1176 }
1177 UnusedLocalTypedefNameCandidates.clear();
1178}
1179
1180void Sema::ActOnStartOfTranslationUnit() {
1181 if (getLangOpts().CPlusPlusModules &&
1182 getLangOpts().getCompilingModule() == LangOptions::CMK_HeaderUnit)
1183 HandleStartOfHeaderUnit();
1184}
1185
1186void Sema::ActOnEndOfTranslationUnitFragment(TUFragmentKind Kind) {
1187 if (Kind == TUFragmentKind::Global) {
1188 // Perform Pending Instantiations at the end of global module fragment so
1189 // that the module ownership of TU-level decls won't get messed.
1190 llvm::TimeTraceScope TimeScope("PerformPendingInstantiations");
1191 PerformPendingInstantiations();
1192 return;
1193 }
1194
1195 // Transfer late parsed template instantiations over to the pending template
1196 // instantiation list. During normal compilation, the late template parser
1197 // will be installed and instantiating these templates will succeed.
1198 //
1199 // If we are building a TU prefix for serialization, it is also safe to
1200 // transfer these over, even though they are not parsed. The end of the TU
1201 // should be outside of any eager template instantiation scope, so when this
1202 // AST is deserialized, these templates will not be parsed until the end of
1203 // the combined TU.
1204 PendingInstantiations.insert(position: PendingInstantiations.end(),
1205 first: LateParsedInstantiations.begin(),
1206 last: LateParsedInstantiations.end());
1207 LateParsedInstantiations.clear();
1208
1209 // If DefinedUsedVTables ends up marking any virtual member functions it
1210 // might lead to more pending template instantiations, which we then need
1211 // to instantiate.
1212 DefineUsedVTables();
1213
1214 // C++: Perform implicit template instantiations.
1215 //
1216 // FIXME: When we perform these implicit instantiations, we do not
1217 // carefully keep track of the point of instantiation (C++ [temp.point]).
1218 // This means that name lookup that occurs within the template
1219 // instantiation will always happen at the end of the translation unit,
1220 // so it will find some names that are not required to be found. This is
1221 // valid, but we could do better by diagnosing if an instantiation uses a
1222 // name that was not visible at its first point of instantiation.
1223 if (ExternalSource) {
1224 // Load pending instantiations from the external source.
1225 SmallVector<PendingImplicitInstantiation, 4> Pending;
1226 ExternalSource->ReadPendingInstantiations(Pending);
1227 for (auto PII : Pending)
1228 if (auto Func = dyn_cast<FunctionDecl>(Val: PII.first))
1229 Func->setInstantiationIsPending(true);
1230 PendingInstantiations.insert(position: PendingInstantiations.begin(),
1231 first: Pending.begin(), last: Pending.end());
1232 }
1233
1234 {
1235 llvm::TimeTraceScope TimeScope("PerformPendingInstantiations");
1236 PerformPendingInstantiations();
1237 }
1238
1239 emitDeferredDiags();
1240
1241 assert(LateParsedInstantiations.empty() &&
1242 "end of TU template instantiation should not create more "
1243 "late-parsed templates");
1244}
1245
1246void Sema::ActOnEndOfTranslationUnit() {
1247 assert(DelayedDiagnostics.getCurrentPool() == nullptr
1248 && "reached end of translation unit with a pool attached?");
1249
1250 // If code completion is enabled, don't perform any end-of-translation-unit
1251 // work.
1252 if (PP.isCodeCompletionEnabled())
1253 return;
1254
1255 // Complete translation units and modules define vtables and perform implicit
1256 // instantiations. PCH files do not.
1257 if (TUKind != TU_Prefix) {
1258 ObjC().DiagnoseUseOfUnimplementedSelectors();
1259
1260 ActOnEndOfTranslationUnitFragment(
1261 Kind: !ModuleScopes.empty() && ModuleScopes.back().Module->Kind ==
1262 Module::PrivateModuleFragment
1263 ? TUFragmentKind::Private
1264 : TUFragmentKind::Normal);
1265
1266 CheckDelayedMemberExceptionSpecs();
1267 } else {
1268 // If we are building a TU prefix for serialization, it is safe to transfer
1269 // these over, even though they are not parsed. The end of the TU should be
1270 // outside of any eager template instantiation scope, so when this AST is
1271 // deserialized, these templates will not be parsed until the end of the
1272 // combined TU.
1273 PendingInstantiations.insert(position: PendingInstantiations.end(),
1274 first: LateParsedInstantiations.begin(),
1275 last: LateParsedInstantiations.end());
1276 LateParsedInstantiations.clear();
1277
1278 if (LangOpts.PCHInstantiateTemplates) {
1279 llvm::TimeTraceScope TimeScope("PerformPendingInstantiations");
1280 PerformPendingInstantiations();
1281 }
1282 }
1283
1284 DiagnoseUnterminatedPragmaAlignPack();
1285 DiagnoseUnterminatedPragmaAttribute();
1286 OpenMP().DiagnoseUnterminatedOpenMPDeclareTarget();
1287 DiagnosePrecisionLossInComplexDivision();
1288
1289 // All delayed member exception specs should be checked or we end up accepting
1290 // incompatible declarations.
1291 assert(DelayedOverridingExceptionSpecChecks.empty());
1292 assert(DelayedEquivalentExceptionSpecChecks.empty());
1293
1294 // All dllexport classes should have been processed already.
1295 assert(DelayedDllExportClasses.empty());
1296 assert(DelayedDllExportMemberFunctions.empty());
1297
1298 // Remove file scoped decls that turned out to be used.
1299 UnusedFileScopedDecls.erase(
1300 From: std::remove_if(first: UnusedFileScopedDecls.begin(source: nullptr, LocalOnly: true),
1301 last: UnusedFileScopedDecls.end(),
1302 pred: [this](const DeclaratorDecl *DD) {
1303 return ShouldRemoveFromUnused(SemaRef: this, D: DD);
1304 }),
1305 To: UnusedFileScopedDecls.end());
1306
1307 if (TUKind == TU_Prefix) {
1308 // Translation unit prefixes don't need any of the checking below.
1309 if (!PP.isIncrementalProcessingEnabled())
1310 TUScope = nullptr;
1311 return;
1312 }
1313
1314 // Check for #pragma weak identifiers that were never declared
1315 LoadExternalWeakUndeclaredIdentifiers();
1316 for (const auto &WeakIDs : WeakUndeclaredIdentifiers) {
1317 if (WeakIDs.second.empty())
1318 continue;
1319
1320 Decl *PrevDecl = LookupSingleName(S: TUScope, Name: WeakIDs.first, Loc: SourceLocation(),
1321 NameKind: LookupOrdinaryName);
1322 if (PrevDecl != nullptr &&
1323 !(isa<FunctionDecl>(Val: PrevDecl) || isa<VarDecl>(Val: PrevDecl)))
1324 for (const auto &WI : WeakIDs.second)
1325 Diag(Loc: WI.getLocation(), DiagID: diag::warn_attribute_wrong_decl_type)
1326 << "'weak'" << /*isRegularKeyword=*/0 << ExpectedVariableOrFunction;
1327 else
1328 for (const auto &WI : WeakIDs.second)
1329 Diag(Loc: WI.getLocation(), DiagID: diag::warn_weak_identifier_undeclared)
1330 << WeakIDs.first;
1331 }
1332
1333 if (LangOpts.CPlusPlus11 &&
1334 !Diags.isIgnored(DiagID: diag::warn_delegating_ctor_cycle, Loc: SourceLocation()))
1335 CheckDelegatingCtorCycles();
1336
1337 if (!Diags.hasErrorOccurred()) {
1338 if (ExternalSource)
1339 ExternalSource->ReadUndefinedButUsed(Undefined&: UndefinedButUsed);
1340 checkUndefinedButUsed(S&: *this);
1341 }
1342
1343 // A global-module-fragment is only permitted within a module unit.
1344 if (!ModuleScopes.empty() && ModuleScopes.back().Module->Kind ==
1345 Module::ExplicitGlobalModuleFragment) {
1346 Diag(Loc: ModuleScopes.back().BeginLoc,
1347 DiagID: diag::err_module_declaration_missing_after_global_module_introducer);
1348 } else if (getLangOpts().getCompilingModule() ==
1349 LangOptions::CMK_ModuleInterface &&
1350 // We can't use ModuleScopes here since ModuleScopes is always
1351 // empty if we're compiling the BMI.
1352 !getASTContext().getCurrentNamedModule()) {
1353 // If we are building a module interface unit, we should have seen the
1354 // module declaration.
1355 //
1356 // FIXME: Make a better guess as to where to put the module declaration.
1357 Diag(Loc: getSourceManager().getLocForStartOfFile(
1358 FID: getSourceManager().getMainFileID()),
1359 DiagID: diag::err_module_declaration_missing);
1360 }
1361
1362 // Now we can decide whether the modules we're building need an initializer.
1363 if (Module *CurrentModule = getCurrentModule();
1364 CurrentModule && CurrentModule->isInterfaceOrPartition()) {
1365 auto DoesModNeedInit = [this](Module *M) {
1366 if (!getASTContext().getModuleInitializers(M).empty())
1367 return true;
1368 for (auto [Exported, _] : M->Exports)
1369 if (Exported->isNamedModuleInterfaceHasInit())
1370 return true;
1371 for (Module *I : M->Imports)
1372 if (I->isNamedModuleInterfaceHasInit())
1373 return true;
1374
1375 return false;
1376 };
1377
1378 CurrentModule->NamedModuleHasInit =
1379 DoesModNeedInit(CurrentModule) ||
1380 llvm::any_of(Range: CurrentModule->submodules(), P: DoesModNeedInit);
1381 }
1382
1383 if (TUKind == TU_ClangModule) {
1384 // If we are building a module, resolve all of the exported declarations
1385 // now.
1386 if (Module *CurrentModule = PP.getCurrentModule()) {
1387 ModuleMap &ModMap = PP.getHeaderSearchInfo().getModuleMap();
1388
1389 SmallVector<Module *, 2> Stack;
1390 Stack.push_back(Elt: CurrentModule);
1391 while (!Stack.empty()) {
1392 Module *Mod = Stack.pop_back_val();
1393
1394 // Resolve the exported declarations and conflicts.
1395 // FIXME: Actually complain, once we figure out how to teach the
1396 // diagnostic client to deal with complaints in the module map at this
1397 // point.
1398 ModMap.resolveExports(Mod, /*Complain=*/false);
1399 ModMap.resolveUses(Mod, /*Complain=*/false);
1400 ModMap.resolveConflicts(Mod, /*Complain=*/false);
1401
1402 // Queue the submodules, so their exports will also be resolved.
1403 auto SubmodulesRange = Mod->submodules();
1404 Stack.append(in_start: SubmodulesRange.begin(), in_end: SubmodulesRange.end());
1405 }
1406 }
1407
1408 // Warnings emitted in ActOnEndOfTranslationUnit() should be emitted for
1409 // modules when they are built, not every time they are used.
1410 emitAndClearUnusedLocalTypedefWarnings();
1411 }
1412
1413 // C++ standard modules. Diagnose cases where a function is declared inline
1414 // in the module purview but has no definition before the end of the TU or
1415 // the start of a Private Module Fragment (if one is present).
1416 if (!PendingInlineFuncDecls.empty()) {
1417 for (auto *D : PendingInlineFuncDecls) {
1418 if (auto *FD = dyn_cast<FunctionDecl>(Val: D)) {
1419 bool DefInPMF = false;
1420 if (auto *FDD = FD->getDefinition()) {
1421 DefInPMF = FDD->getOwningModule()->isPrivateModule();
1422 if (!DefInPMF)
1423 continue;
1424 }
1425 Diag(Loc: FD->getLocation(), DiagID: diag::err_export_inline_not_defined)
1426 << DefInPMF;
1427 // If we have a PMF it should be at the end of the ModuleScopes.
1428 if (DefInPMF &&
1429 ModuleScopes.back().Module->Kind == Module::PrivateModuleFragment) {
1430 Diag(Loc: ModuleScopes.back().BeginLoc,
1431 DiagID: diag::note_private_module_fragment);
1432 }
1433 }
1434 }
1435 PendingInlineFuncDecls.clear();
1436 }
1437
1438 // C99 6.9.2p2:
1439 // A declaration of an identifier for an object that has file
1440 // scope without an initializer, and without a storage-class
1441 // specifier or with the storage-class specifier static,
1442 // constitutes a tentative definition. If a translation unit
1443 // contains one or more tentative definitions for an identifier,
1444 // and the translation unit contains no external definition for
1445 // that identifier, then the behavior is exactly as if the
1446 // translation unit contains a file scope declaration of that
1447 // identifier, with the composite type as of the end of the
1448 // translation unit, with an initializer equal to 0.
1449 llvm::SmallPtrSet<VarDecl *, 32> Seen;
1450 for (TentativeDefinitionsType::iterator
1451 T = TentativeDefinitions.begin(source: ExternalSource.get()),
1452 TEnd = TentativeDefinitions.end();
1453 T != TEnd; ++T) {
1454 VarDecl *VD = (*T)->getActingDefinition();
1455
1456 // If the tentative definition was completed, getActingDefinition() returns
1457 // null. If we've already seen this variable before, insert()'s second
1458 // return value is false.
1459 if (!VD || VD->isInvalidDecl() || !Seen.insert(Ptr: VD).second)
1460 continue;
1461
1462 if (const IncompleteArrayType *ArrayT
1463 = Context.getAsIncompleteArrayType(T: VD->getType())) {
1464 // Set the length of the array to 1 (C99 6.9.2p5).
1465 Diag(Loc: VD->getLocation(), DiagID: diag::warn_tentative_incomplete_array);
1466 llvm::APInt One(Context.getTypeSize(T: Context.getSizeType()), true);
1467 QualType T = Context.getConstantArrayType(
1468 EltTy: ArrayT->getElementType(), ArySize: One, SizeExpr: nullptr, ASM: ArraySizeModifier::Normal, IndexTypeQuals: 0);
1469 VD->setType(T);
1470 } else if (RequireCompleteType(Loc: VD->getLocation(), T: VD->getType(),
1471 DiagID: diag::err_tentative_def_incomplete_type))
1472 VD->setInvalidDecl();
1473
1474 // No initialization is performed for a tentative definition.
1475 CheckCompleteVariableDeclaration(VD);
1476
1477 // In C, if the definition is const-qualified and has no initializer, it
1478 // is left uninitialized unless it has static or thread storage duration.
1479 QualType Type = VD->getType();
1480 if (!VD->isInvalidDecl() && !getLangOpts().CPlusPlus &&
1481 Type.isConstQualified() && !VD->getAnyInitializer()) {
1482 unsigned DiagID = diag::warn_default_init_const_unsafe;
1483 if (VD->getStorageDuration() == SD_Static ||
1484 VD->getStorageDuration() == SD_Thread)
1485 DiagID = diag::warn_default_init_const;
1486
1487 bool EmitCppCompat = !Diags.isIgnored(
1488 DiagID: diag::warn_cxx_compat_hack_fake_diagnostic_do_not_emit,
1489 Loc: VD->getLocation());
1490
1491 Diag(Loc: VD->getLocation(), DiagID) << Type << EmitCppCompat;
1492 }
1493
1494 // Notify the consumer that we've completed a tentative definition.
1495 if (!VD->isInvalidDecl())
1496 Consumer.CompleteTentativeDefinition(D: VD);
1497 }
1498
1499 // In incremental mode, tentative definitions belong to the current
1500 // partial translation unit (PTU). Once they have been completed and
1501 // emitted to codegen, drop them to prevent re-emission in future PTUs.
1502 if (PP.isIncrementalProcessingEnabled())
1503 TentativeDefinitions.erase(From: TentativeDefinitions.begin(source: ExternalSource.get()),
1504 To: TentativeDefinitions.end());
1505
1506 for (auto *D : ExternalDeclarations) {
1507 if (!D || D->isInvalidDecl() || D->getPreviousDecl() || !D->isUsed())
1508 continue;
1509
1510 Consumer.CompleteExternalDeclaration(D);
1511 }
1512
1513 // Visit all pending #pragma export.
1514 for (const PendingPragmaInfo &Exported : PendingExportedNames.values()) {
1515 if (!Exported.Used)
1516 Diag(Loc: Exported.NameLoc, DiagID: diag::warn_failed_to_resolve_pragma) << "export";
1517 }
1518
1519 if (LangOpts.HLSL)
1520 HLSL().ActOnEndOfTranslationUnit(TU: getASTContext().getTranslationUnitDecl());
1521 if (LangOpts.OpenACC)
1522 OpenACC().ActOnEndOfTranslationUnit(
1523 TU: getASTContext().getTranslationUnitDecl());
1524
1525 // If there were errors, disable 'unused' warnings since they will mostly be
1526 // noise. Don't warn for a use from a module: either we should warn on all
1527 // file-scope declarations in modules or not at all, but whether the
1528 // declaration is used is immaterial.
1529 if (!Diags.hasErrorOccurred() && TUKind != TU_ClangModule) {
1530 // Output warning for unused file scoped decls.
1531 for (UnusedFileScopedDeclsType::iterator
1532 I = UnusedFileScopedDecls.begin(source: ExternalSource.get()),
1533 E = UnusedFileScopedDecls.end();
1534 I != E; ++I) {
1535 if (ShouldRemoveFromUnused(SemaRef: this, D: *I))
1536 continue;
1537
1538 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Val: *I)) {
1539 const FunctionDecl *DiagD;
1540 if (!FD->hasBody(Definition&: DiagD))
1541 DiagD = FD;
1542 if (DiagD->isDeleted())
1543 continue; // Deleted functions are supposed to be unused.
1544 SourceRange DiagRange = DiagD->getLocation();
1545 if (const ASTTemplateArgumentListInfo *ASTTAL =
1546 DiagD->getTemplateSpecializationArgsAsWritten())
1547 DiagRange.setEnd(ASTTAL->RAngleLoc);
1548 if (DiagD->isReferenced()) {
1549 if (isa<CXXMethodDecl>(Val: DiagD))
1550 Diag(Loc: DiagD->getLocation(), DiagID: diag::warn_unneeded_member_function)
1551 << DiagD << DiagRange;
1552 else {
1553 if (FD->getStorageClass() == SC_Static &&
1554 !FD->isInlineSpecified() &&
1555 !SourceMgr.isInMainFile(
1556 Loc: SourceMgr.getExpansionLoc(Loc: FD->getLocation())))
1557 Diag(Loc: DiagD->getLocation(),
1558 DiagID: diag::warn_unneeded_static_internal_decl)
1559 << DiagD << DiagRange;
1560 else
1561 Diag(Loc: DiagD->getLocation(), DiagID: diag::warn_unneeded_internal_decl)
1562 << /*function=*/0 << DiagD << DiagRange;
1563 }
1564 } else if (!FD->isTargetMultiVersion() ||
1565 FD->isTargetMultiVersionDefault()) {
1566 if (FD->getDescribedFunctionTemplate())
1567 Diag(Loc: DiagD->getLocation(), DiagID: diag::warn_unused_template)
1568 << /*function=*/0 << DiagD << DiagRange;
1569 else
1570 Diag(Loc: DiagD->getLocation(), DiagID: isa<CXXMethodDecl>(Val: DiagD)
1571 ? diag::warn_unused_member_function
1572 : diag::warn_unused_function)
1573 << DiagD << DiagRange;
1574 }
1575 } else {
1576 const VarDecl *DiagD = cast<VarDecl>(Val: *I)->getDefinition();
1577 if (!DiagD)
1578 DiagD = cast<VarDecl>(Val: *I);
1579 SourceRange DiagRange = DiagD->getLocation();
1580 if (const auto *VTSD = dyn_cast<VarTemplateSpecializationDecl>(Val: DiagD)) {
1581 if (const ASTTemplateArgumentListInfo *ASTTAL =
1582 VTSD->getTemplateArgsAsWritten())
1583 DiagRange.setEnd(ASTTAL->RAngleLoc);
1584 }
1585 if (DiagD->isReferenced()) {
1586 Diag(Loc: DiagD->getLocation(), DiagID: diag::warn_unneeded_internal_decl)
1587 << /*variable=*/1 << DiagD << DiagRange;
1588 } else if (DiagD->getDescribedVarTemplate()) {
1589 Diag(Loc: DiagD->getLocation(), DiagID: diag::warn_unused_template)
1590 << /*variable=*/1 << DiagD << DiagRange;
1591 } else if (DiagD->getType().isConstQualified()) {
1592 const SourceManager &SM = SourceMgr;
1593 if (SM.getMainFileID() != SM.getFileID(SpellingLoc: DiagD->getLocation()) ||
1594 !PP.getLangOpts().IsHeaderFile)
1595 Diag(Loc: DiagD->getLocation(), DiagID: diag::warn_unused_const_variable)
1596 << DiagD << DiagRange;
1597 } else {
1598 Diag(Loc: DiagD->getLocation(), DiagID: diag::warn_unused_variable)
1599 << DiagD << DiagRange;
1600 }
1601 }
1602 }
1603
1604 emitAndClearUnusedLocalTypedefWarnings();
1605 }
1606
1607 if (!Diags.isIgnored(DiagID: diag::warn_unused_private_field, Loc: SourceLocation())) {
1608 // FIXME: Load additional unused private field candidates from the external
1609 // source.
1610 RecordCompleteMap RecordsComplete;
1611 RecordCompleteMap MNCComplete;
1612 for (const NamedDecl *D : UnusedPrivateFields) {
1613 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Val: D->getDeclContext());
1614 if (RD && !RD->isUnion() &&
1615 IsRecordFullyDefined(RD, RecordsComplete, MNCComplete)) {
1616 Diag(Loc: D->getLocation(), DiagID: diag::warn_unused_private_field)
1617 << D->getDeclName();
1618 }
1619 }
1620 }
1621
1622 if (!Diags.isIgnored(DiagID: diag::warn_mismatched_delete_new, Loc: SourceLocation())) {
1623 if (ExternalSource)
1624 ExternalSource->ReadMismatchingDeleteExpressions(DeleteExprs);
1625 for (const auto &DeletedFieldInfo : DeleteExprs) {
1626 for (const auto &DeleteExprLoc : DeletedFieldInfo.second) {
1627 AnalyzeDeleteExprMismatch(Field: DeletedFieldInfo.first, DeleteLoc: DeleteExprLoc.first,
1628 DeleteWasArrayForm: DeleteExprLoc.second);
1629 }
1630 }
1631 }
1632
1633 AnalysisWarnings.IssueWarnings(D: Context.getTranslationUnitDecl());
1634
1635 if (Context.hasAnyFunctionEffects())
1636 performFunctionEffectAnalysis(TU: Context.getTranslationUnitDecl());
1637
1638 // Check we've noticed that we're no longer parsing the initializer for every
1639 // variable. If we miss cases, then at best we have a performance issue and
1640 // at worst a rejects-valid bug.
1641 assert(ParsingInitForAutoVars.empty() &&
1642 "Didn't unmark var as having its initializer parsed");
1643
1644 if (!PP.isIncrementalProcessingEnabled())
1645 TUScope = nullptr;
1646
1647 checkExposure(TU: Context.getTranslationUnitDecl());
1648}
1649
1650
1651//===----------------------------------------------------------------------===//
1652// Helper functions.
1653//===----------------------------------------------------------------------===//
1654
1655DeclContext *Sema::getFunctionLevelDeclContext(bool AllowLambda) const {
1656 DeclContext *DC = CurContext;
1657
1658 while (true) {
1659 if (isa<BlockDecl>(Val: DC) || isa<EnumDecl>(Val: DC) || isa<CapturedDecl>(Val: DC) ||
1660 isa<RequiresExprBodyDecl>(Val: DC)) {
1661 DC = DC->getParent();
1662 } else if (!AllowLambda && isa<CXXMethodDecl>(Val: DC) &&
1663 cast<CXXMethodDecl>(Val: DC)->getOverloadedOperator() == OO_Call &&
1664 cast<CXXRecordDecl>(Val: DC->getParent())->isLambda()) {
1665 DC = DC->getParent()->getParent();
1666 } else break;
1667 }
1668
1669 return DC;
1670}
1671
1672/// getCurFunctionDecl - If inside of a function body, this returns a pointer
1673/// to the function decl for the function being parsed. If we're currently
1674/// in a 'block', this returns the containing context.
1675FunctionDecl *Sema::getCurFunctionDecl(bool AllowLambda) const {
1676 DeclContext *DC = getFunctionLevelDeclContext(AllowLambda);
1677 return dyn_cast<FunctionDecl>(Val: DC);
1678}
1679
1680ObjCMethodDecl *Sema::getCurMethodDecl() {
1681 DeclContext *DC = getFunctionLevelDeclContext();
1682 while (isa<RecordDecl>(Val: DC))
1683 DC = DC->getParent();
1684 return dyn_cast<ObjCMethodDecl>(Val: DC);
1685}
1686
1687NamedDecl *Sema::getCurFunctionOrMethodDecl() const {
1688 DeclContext *DC = getFunctionLevelDeclContext();
1689 if (isa<ObjCMethodDecl>(Val: DC) || isa<FunctionDecl>(Val: DC))
1690 return cast<NamedDecl>(Val: DC);
1691 return nullptr;
1692}
1693
1694LangAS Sema::getDefaultCXXMethodAddrSpace() const {
1695 if (getLangOpts().OpenCL)
1696 return getASTContext().getDefaultOpenCLPointeeAddrSpace();
1697 return LangAS::Default;
1698}
1699
1700void Sema::EmitDiagnostic(unsigned DiagID, const DiagnosticBuilder &DB) {
1701 // FIXME: It doesn't make sense to me that DiagID is an incoming argument here
1702 // and yet we also use the current diag ID on the DiagnosticsEngine. This has
1703 // been made more painfully obvious by the refactor that introduced this
1704 // function, but it is possible that the incoming argument can be
1705 // eliminated. If it truly cannot be (for example, there is some reentrancy
1706 // issue I am not seeing yet), then there should at least be a clarifying
1707 // comment somewhere.
1708 Diagnostic DiagInfo(&Diags, DB);
1709 if (SFINAETrap *Trap = getSFINAEContext()) {
1710 sema::TemplateDeductionInfo *Info = Trap->getDeductionInfo();
1711 switch (DiagnosticIDs::getDiagnosticSFINAEResponse(DiagID: DiagInfo.getID())) {
1712 case DiagnosticIDs::SFINAE_Report:
1713 // We'll report the diagnostic below.
1714 break;
1715
1716 case DiagnosticIDs::SFINAE_SubstitutionFailure:
1717 // Count this failure so that we know that template argument deduction
1718 // has failed.
1719 Trap->setErrorOccurred();
1720
1721 // Make a copy of this suppressed diagnostic and store it with the
1722 // template-deduction information.
1723 if (Info && !Info->hasSFINAEDiagnostic())
1724 Info->addSFINAEDiagnostic(
1725 Loc: DiagInfo.getLocation(),
1726 PD: PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
1727
1728 Diags.setLastDiagnosticIgnored(true);
1729 return;
1730
1731 case DiagnosticIDs::SFINAE_AccessControl: {
1732 // Per C++ Core Issue 1170, access control is part of SFINAE.
1733 // Additionally, the WithAccessChecking flag can be used to temporarily
1734 // make access control a part of SFINAE for the purposes of checking
1735 // type traits.
1736 if (!Trap->withAccessChecking() && !getLangOpts().CPlusPlus11)
1737 break;
1738
1739 SourceLocation Loc = DiagInfo.getLocation();
1740
1741 // Suppress this diagnostic.
1742 Trap->setErrorOccurred();
1743
1744 // Make a copy of this suppressed diagnostic and store it with the
1745 // template-deduction information.
1746 if (Info && !Info->hasSFINAEDiagnostic())
1747 Info->addSFINAEDiagnostic(
1748 Loc: DiagInfo.getLocation(),
1749 PD: PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
1750
1751 Diags.setLastDiagnosticIgnored(true);
1752
1753 // Now produce a C++98 compatibility warning.
1754 Diag(Loc, DiagID: diag::warn_cxx98_compat_sfinae_access_control);
1755
1756 // The last diagnostic which Sema produced was ignored. Suppress any
1757 // notes attached to it.
1758 Diags.setLastDiagnosticIgnored(true);
1759 return;
1760 }
1761
1762 case DiagnosticIDs::SFINAE_Suppress:
1763 if (DiagnosticsEngine::Level Level = getDiagnostics().getDiagnosticLevel(
1764 DiagID: DiagInfo.getID(), Loc: DiagInfo.getLocation());
1765 Level == DiagnosticsEngine::Ignored)
1766 return;
1767 // Make a copy of this suppressed diagnostic and store it with the
1768 // template-deduction information;
1769 if (Info) {
1770 Info->addSuppressedDiagnostic(
1771 Loc: DiagInfo.getLocation(),
1772 PD: PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
1773 if (!Diags.getDiagnosticIDs()->isNote(DiagID))
1774 PrintContextStack(DiagFunc: [Info](SourceLocation Loc, PartialDiagnostic PD) {
1775 Info->addSuppressedDiagnostic(Loc, PD: std::move(PD));
1776 });
1777 }
1778
1779 // Suppress this diagnostic.
1780 Diags.setLastDiagnosticIgnored(true);
1781 return;
1782 }
1783 }
1784
1785 // Copy the diagnostic printing policy over the ASTContext printing policy.
1786 // TODO: Stop doing that. See: https://reviews.llvm.org/D45093#1090292
1787 Context.setPrintingPolicy(getPrintingPolicy());
1788
1789 // Emit the diagnostic.
1790 if (!Diags.EmitDiagnostic(DB))
1791 return;
1792
1793 // If this is not a note, and we're in a template instantiation
1794 // that is different from the last template instantiation where
1795 // we emitted an error, print a template instantiation
1796 // backtrace.
1797 if (!Diags.getDiagnosticIDs()->isNote(DiagID))
1798 PrintContextStack();
1799}
1800
1801bool Sema::hasUncompilableErrorOccurred() const {
1802 if (getDiagnostics().hasUncompilableErrorOccurred())
1803 return true;
1804 auto *FD = dyn_cast<FunctionDecl>(Val: CurContext);
1805 if (!FD)
1806 return false;
1807 auto Loc = DeviceDeferredDiags.find(Val: FD);
1808 if (Loc == DeviceDeferredDiags.end())
1809 return false;
1810 for (auto PDAt : Loc->second) {
1811 if (Diags.getDiagnosticIDs()->isDefaultMappingAsError(
1812 DiagID: PDAt.second.getDiagID()))
1813 return true;
1814 }
1815 return false;
1816}
1817
1818// Print notes showing how we can reach FD starting from an a priori
1819// known-callable function. When a function has multiple callers, emit
1820// each call chain separately. The first note in each chain uses
1821// "called by" and subsequent notes use "which is called by".
1822static void emitCallStackNotes(Sema &S, const FunctionDecl *FD) {
1823 auto FnIt = S.CUDA().DeviceKnownEmittedFns.find(Val: FD);
1824 if (FnIt == S.CUDA().DeviceKnownEmittedFns.end())
1825 return;
1826
1827 for (const auto &CallerInfo : FnIt->second) {
1828 if (S.Diags.hasFatalErrorOccurred())
1829 return;
1830 S.Diags.Report(Loc: CallerInfo.Loc, DiagID: diag::note_called_by) << CallerInfo.FD;
1831 // Walk up the rest of the chain using "which is called by".
1832 auto NextIt = S.CUDA().DeviceKnownEmittedFns.find(Val: CallerInfo.FD);
1833 while (NextIt != S.CUDA().DeviceKnownEmittedFns.end()) {
1834 if (S.Diags.hasFatalErrorOccurred())
1835 return;
1836 const auto &Next = NextIt->second.front();
1837 S.Diags.Report(Loc: Next.Loc, DiagID: diag::note_which_is_called_by) << Next.FD;
1838 NextIt = S.CUDA().DeviceKnownEmittedFns.find(Val: Next.FD);
1839 }
1840 }
1841}
1842
1843namespace {
1844
1845/// Helper class that emits deferred diagnostic messages if an entity directly
1846/// or indirectly using the function that causes the deferred diagnostic
1847/// messages is known to be emitted.
1848///
1849/// During parsing of AST, certain diagnostic messages are recorded as deferred
1850/// diagnostics since it is unknown whether the functions containing such
1851/// diagnostics will be emitted. A list of potentially emitted functions and
1852/// variables that may potentially trigger emission of functions are also
1853/// recorded. DeferredDiagnosticsEmitter recursively visits used functions
1854/// by each function to emit deferred diagnostics.
1855///
1856/// During the visit, certain OpenMP directives or initializer of variables
1857/// with certain OpenMP attributes will cause subsequent visiting of any
1858/// functions enter a state which is called OpenMP device context in this
1859/// implementation. The state is exited when the directive or initializer is
1860/// exited. This state can change the emission states of subsequent uses
1861/// of functions.
1862///
1863/// Conceptually the functions or variables to be visited form a use graph
1864/// where the parent node uses the child node. At any point of the visit,
1865/// the tree nodes traversed from the tree root to the current node form a use
1866/// stack. The emission state of the current node depends on two factors:
1867/// 1. the emission state of the root node
1868/// 2. whether the current node is in OpenMP device context
1869/// If the function is decided to be emitted, its contained deferred diagnostics
1870/// are emitted, together with the information about the use stack.
1871///
1872class DeferredDiagnosticsEmitter
1873 : public UsedDeclVisitor<DeferredDiagnosticsEmitter> {
1874public:
1875 typedef UsedDeclVisitor<DeferredDiagnosticsEmitter> Inherited;
1876
1877 // Whether the function is already in the current use-path.
1878 llvm::SmallPtrSet<CanonicalDeclPtr<Decl>, 4> InUsePath;
1879
1880 // The current use-path.
1881 llvm::SmallVector<CanonicalDeclPtr<FunctionDecl>, 4> UsePath;
1882
1883 // Whether the visiting of the function has been done. Done[0] is for the
1884 // case not in OpenMP device context. Done[1] is for the case in OpenMP
1885 // device context. We need two sets because diagnostics emission may be
1886 // different depending on whether it is in OpenMP device context.
1887 llvm::SmallPtrSet<CanonicalDeclPtr<Decl>, 4> DoneMap[2];
1888
1889 // Functions that need their deferred diagnostics emitted. Collected
1890 // during the graph walk and emitted afterwards so that all callers
1891 // are known when producing call chain notes.
1892 llvm::SetVector<CanonicalDeclPtr<const FunctionDecl>> FnsToEmit;
1893
1894 // Emission state of the root node of the current use graph.
1895 bool ShouldEmitRootNode;
1896
1897 // Current OpenMP device context level. It is initialized to 0 and each
1898 // entering of device context increases it by 1 and each exit decreases
1899 // it by 1. Non-zero value indicates it is currently in device context.
1900 unsigned InOMPDeviceContext;
1901
1902 DeferredDiagnosticsEmitter(Sema &S)
1903 : Inherited(S), ShouldEmitRootNode(false), InOMPDeviceContext(0) {}
1904
1905 bool shouldVisitDiscardedStmt() const { return false; }
1906
1907 void VisitOMPTargetDirective(OMPTargetDirective *Node) {
1908 ++InOMPDeviceContext;
1909 Inherited::VisitOMPTargetDirective(S: Node);
1910 --InOMPDeviceContext;
1911 }
1912
1913 void visitUsedDecl(SourceLocation Loc, Decl *D) {
1914 if (isa<VarDecl>(Val: D))
1915 return;
1916 if (auto *FD = dyn_cast<FunctionDecl>(Val: D))
1917 checkFunc(Loc, FD);
1918 else
1919 Inherited::visitUsedDecl(Loc, D);
1920 }
1921
1922 // Visitor member and parent dtors called by this dtor.
1923 void VisitCalledDestructors(CXXDestructorDecl *DD) {
1924 const CXXRecordDecl *RD = DD->getParent();
1925
1926 // Visit the dtors of all members
1927 for (const FieldDecl *FD : RD->fields()) {
1928 QualType FT = FD->getType();
1929 if (const auto *ClassDecl = FT->getAsCXXRecordDecl();
1930 ClassDecl &&
1931 (ClassDecl->isBeingDefined() || ClassDecl->isCompleteDefinition()))
1932 if (CXXDestructorDecl *MemberDtor = ClassDecl->getDestructor())
1933 asImpl().visitUsedDecl(Loc: MemberDtor->getLocation(), D: MemberDtor);
1934 }
1935
1936 // Also visit base class dtors
1937 for (const auto &Base : RD->bases()) {
1938 QualType BaseType = Base.getType();
1939 if (const auto *BaseDecl = BaseType->getAsCXXRecordDecl();
1940 BaseDecl &&
1941 (BaseDecl->isBeingDefined() || BaseDecl->isCompleteDefinition()))
1942 if (CXXDestructorDecl *BaseDtor = BaseDecl->getDestructor())
1943 asImpl().visitUsedDecl(Loc: BaseDtor->getLocation(), D: BaseDtor);
1944 }
1945 }
1946
1947 void VisitDeclStmt(DeclStmt *DS) {
1948 // Visit dtors called by variables that need destruction
1949 for (auto *D : DS->decls())
1950 if (auto *VD = dyn_cast<VarDecl>(Val: D))
1951 if (VD->isThisDeclarationADefinition() &&
1952 VD->needsDestruction(Ctx: S.Context)) {
1953 QualType VT = VD->getType();
1954 if (const auto *ClassDecl = VT->getAsCXXRecordDecl();
1955 ClassDecl && (ClassDecl->isBeingDefined() ||
1956 ClassDecl->isCompleteDefinition()))
1957 if (CXXDestructorDecl *Dtor = ClassDecl->getDestructor())
1958 asImpl().visitUsedDecl(Loc: Dtor->getLocation(), D: Dtor);
1959 }
1960
1961 Inherited::VisitDeclStmt(S: DS);
1962 }
1963 void checkVar(VarDecl *VD) {
1964 assert(VD->isFileVarDecl() &&
1965 "Should only check file-scope variables");
1966 if (auto *Init = VD->getInit()) {
1967 auto DevTy = OMPDeclareTargetDeclAttr::getDeviceType(VD);
1968 bool IsDev = DevTy && (*DevTy == OMPDeclareTargetDeclAttr::DT_NoHost ||
1969 *DevTy == OMPDeclareTargetDeclAttr::DT_Any);
1970 if (IsDev)
1971 ++InOMPDeviceContext;
1972 this->Visit(S: Init);
1973 if (IsDev)
1974 --InOMPDeviceContext;
1975 }
1976 }
1977
1978 void checkFunc(SourceLocation Loc, FunctionDecl *FD) {
1979 auto &Done = DoneMap[InOMPDeviceContext > 0 ? 1 : 0];
1980 FunctionDecl *Caller = UsePath.empty() ? nullptr : UsePath.back();
1981 if ((!ShouldEmitRootNode && !S.getLangOpts().OpenMP && !Caller) ||
1982 S.shouldIgnoreInHostDeviceCheck(Callee: FD) || InUsePath.count(Ptr: FD))
1983 return;
1984 // Finalize analysis of OpenMP-specific constructs.
1985 if (Caller && S.LangOpts.OpenMP && UsePath.size() == 1 &&
1986 (ShouldEmitRootNode || InOMPDeviceContext))
1987 S.OpenMP().finalizeOpenMPDelayedAnalysis(Caller, Callee: FD, Loc);
1988 if (Caller) {
1989 auto &Callers = S.CUDA().DeviceKnownEmittedFns[FD];
1990 CanonicalDeclPtr<const FunctionDecl> CanonCaller(Caller);
1991 if (llvm::none_of(Range&: Callers, P: [CanonCaller](const auto &C) {
1992 return C.FD == CanonCaller;
1993 }))
1994 Callers.push_back(Elt: {.FD: Caller, .Loc: Loc});
1995 }
1996 if (ShouldEmitRootNode || InOMPDeviceContext)
1997 FnsToEmit.insert(X: FD);
1998 // Do not revisit a function if the function body has been completely
1999 // visited before.
2000 if (!Done.insert(Ptr: FD).second)
2001 return;
2002 InUsePath.insert(Ptr: FD);
2003 UsePath.push_back(Elt: FD);
2004 if (auto *S = FD->getBody()) {
2005 this->Visit(S);
2006 }
2007 if (CXXDestructorDecl *Dtor = dyn_cast<CXXDestructorDecl>(Val: FD))
2008 asImpl().VisitCalledDestructors(DD: Dtor);
2009 UsePath.pop_back();
2010 InUsePath.erase(Ptr: FD);
2011 }
2012
2013 void checkRecordedDecl(Decl *D) {
2014 if (auto *FD = dyn_cast<FunctionDecl>(Val: D)) {
2015 ShouldEmitRootNode = S.getEmissionStatus(Decl: FD, /*Final=*/true) ==
2016 Sema::FunctionEmissionStatus::Emitted;
2017 checkFunc(Loc: SourceLocation(), FD);
2018 } else
2019 checkVar(VD: cast<VarDecl>(Val: D));
2020 }
2021
2022 void emitDeferredDiags(const FunctionDecl *FD) {
2023 auto It = S.DeviceDeferredDiags.find(Val: FD);
2024 if (It == S.DeviceDeferredDiags.end())
2025 return;
2026 bool HasWarningOrError = false;
2027 for (PartialDiagnosticAt &PDAt : It->second) {
2028 if (S.Diags.hasFatalErrorOccurred())
2029 return;
2030 const SourceLocation &Loc = PDAt.first;
2031 const PartialDiagnostic &PD = PDAt.second;
2032 HasWarningOrError |=
2033 S.getDiagnostics().getDiagnosticLevel(DiagID: PD.getDiagID(), Loc) >=
2034 DiagnosticsEngine::Warning;
2035 {
2036 DiagnosticBuilder Builder(S.Diags.Report(Loc, DiagID: PD.getDiagID()));
2037 PD.Emit(DB: Builder);
2038 }
2039 }
2040 if (HasWarningOrError)
2041 emitCallStackNotes(S, FD);
2042 }
2043
2044 void emitCollectedDiags() {
2045 for (const auto &FD : FnsToEmit)
2046 emitDeferredDiags(FD);
2047 }
2048};
2049} // namespace
2050
2051void Sema::emitDeferredDiags() {
2052 if (ExternalSource)
2053 ExternalSource->ReadDeclsToCheckForDeferredDiags(
2054 Decls&: DeclsToCheckForDeferredDiags);
2055
2056 if ((DeviceDeferredDiags.empty() && !LangOpts.OpenMP) ||
2057 DeclsToCheckForDeferredDiags.empty())
2058 return;
2059
2060 DeferredDiagnosticsEmitter DDE(*this);
2061 for (auto *D : DeclsToCheckForDeferredDiags)
2062 DDE.checkRecordedDecl(D);
2063 DDE.emitCollectedDiags();
2064}
2065
2066// In CUDA, there are some constructs which may appear in semantically-valid
2067// code, but trigger errors if we ever generate code for the function in which
2068// they appear. Essentially every construct you're not allowed to use on the
2069// device falls into this category, because you are allowed to use these
2070// constructs in a __host__ __device__ function, but only if that function is
2071// never codegen'ed on the device.
2072//
2073// To handle semantic checking for these constructs, we keep track of the set of
2074// functions we know will be emitted, either because we could tell a priori that
2075// they would be emitted, or because they were transitively called by a
2076// known-emitted function.
2077//
2078// We also keep a partial call graph of which not-known-emitted functions call
2079// which other not-known-emitted functions.
2080//
2081// When we see something which is illegal if the current function is emitted
2082// (usually by way of DiagIfDeviceCode, DiagIfHostCode, or
2083// CheckCall), we first check if the current function is known-emitted. If
2084// so, we immediately output the diagnostic.
2085//
2086// Otherwise, we "defer" the diagnostic. It sits in Sema::DeviceDeferredDiags
2087// until we discover that the function is known-emitted, at which point we take
2088// it out of this map and emit the diagnostic.
2089
2090Sema::SemaDiagnosticBuilder::SemaDiagnosticBuilder(Kind K, SourceLocation Loc,
2091 unsigned DiagID,
2092 const FunctionDecl *Fn,
2093 Sema &S)
2094 : S(S), Loc(Loc), DiagID(DiagID), Fn(Fn),
2095 ShowCallStack(K == K_ImmediateWithCallStack || K == K_Deferred) {
2096 switch (K) {
2097 case K_Nop:
2098 break;
2099 case K_Immediate:
2100 case K_ImmediateWithCallStack:
2101 ImmediateDiag.emplace(
2102 args: ImmediateDiagBuilder(S.Diags.Report(Loc, DiagID), S, DiagID));
2103 break;
2104 case K_Deferred:
2105 assert(Fn && "Must have a function to attach the deferred diag to.");
2106 auto &Diags = S.DeviceDeferredDiags[Fn];
2107 PartialDiagId.emplace(args: Diags.size());
2108 Diags.emplace_back(args&: Loc, args: S.PDiag(DiagID));
2109 break;
2110 }
2111}
2112
2113Sema::SemaDiagnosticBuilder::SemaDiagnosticBuilder(SemaDiagnosticBuilder &&D)
2114 : S(D.S), Loc(D.Loc), DiagID(D.DiagID), Fn(D.Fn),
2115 ShowCallStack(D.ShowCallStack), ImmediateDiag(D.ImmediateDiag),
2116 PartialDiagId(D.PartialDiagId) {
2117 // Clean the previous diagnostics.
2118 D.ShowCallStack = false;
2119 D.ImmediateDiag.reset();
2120 D.PartialDiagId.reset();
2121}
2122
2123Sema::SemaDiagnosticBuilder::~SemaDiagnosticBuilder() {
2124 if (ImmediateDiag) {
2125 // Emit our diagnostic and, if it was a warning or error, output a callstack
2126 // if Fn isn't a priori known-emitted.
2127 ImmediateDiag.reset(); // Emit the immediate diag.
2128
2129 if (ShowCallStack) {
2130 bool IsWarningOrError = S.getDiagnostics().getDiagnosticLevel(
2131 DiagID, Loc) >= DiagnosticsEngine::Warning;
2132 if (IsWarningOrError)
2133 emitCallStackNotes(S, FD: Fn);
2134 }
2135 } else {
2136 assert((!PartialDiagId || ShowCallStack) &&
2137 "Must always show call stack for deferred diags.");
2138 }
2139}
2140
2141Sema::SemaDiagnosticBuilder
2142Sema::targetDiag(SourceLocation Loc, unsigned DiagID, const FunctionDecl *FD) {
2143 FD = FD ? FD : getCurFunctionDecl();
2144 if (LangOpts.OpenMP)
2145 return LangOpts.OpenMPIsTargetDevice
2146 ? OpenMP().diagIfOpenMPDeviceCode(Loc, DiagID, FD)
2147 : OpenMP().diagIfOpenMPHostCode(Loc, DiagID, FD);
2148 if (getLangOpts().CUDA)
2149 return getLangOpts().CUDAIsDevice ? CUDA().DiagIfDeviceCode(Loc, DiagID)
2150 : CUDA().DiagIfHostCode(Loc, DiagID);
2151
2152 if (getLangOpts().SYCLIsDevice)
2153 return SYCL().DiagIfDeviceCode(Loc, DiagID);
2154
2155 return SemaDiagnosticBuilder(SemaDiagnosticBuilder::K_Immediate, Loc, DiagID,
2156 FD, *this);
2157}
2158
2159void Sema::checkTypeSupport(QualType Ty, SourceLocation Loc, ValueDecl *D) {
2160 if (isUnevaluatedContext() || Ty.isNull())
2161 return;
2162
2163 // The original idea behind checkTypeSupport function is that unused
2164 // declarations can be replaced with an array of bytes of the same size during
2165 // codegen, such replacement doesn't seem to be possible for types without
2166 // constant byte size like zero length arrays. So, do a deep check for SYCL.
2167 if (D && LangOpts.SYCLIsDevice) {
2168 llvm::DenseSet<QualType> Visited;
2169 SYCL().deepTypeCheckForDevice(UsedAt: Loc, Visited, DeclToCheck: D);
2170 }
2171
2172 Decl *C = cast<Decl>(Val: getCurLexicalContext());
2173
2174 // Memcpy operations for structs containing a member with unsupported type
2175 // are ok, though.
2176 if (const auto *MD = dyn_cast<CXXMethodDecl>(Val: C)) {
2177 if ((MD->isCopyAssignmentOperator() || MD->isMoveAssignmentOperator()) &&
2178 MD->isTrivial())
2179 return;
2180
2181 if (const auto *Ctor = dyn_cast<CXXConstructorDecl>(Val: MD))
2182 if (Ctor->isCopyOrMoveConstructor() && Ctor->isTrivial())
2183 return;
2184 }
2185
2186 // Try to associate errors with the lexical context, if that is a function, or
2187 // the value declaration otherwise.
2188 const FunctionDecl *FD = isa<FunctionDecl>(Val: C)
2189 ? cast<FunctionDecl>(Val: C)
2190 : dyn_cast_or_null<FunctionDecl>(Val: D);
2191
2192 auto CheckDeviceType = [&](QualType Ty) {
2193 if (Ty->isDependentType())
2194 return;
2195
2196 if (Ty->isBitIntType()) {
2197 if (!Context.getTargetInfo().hasBitIntType()) {
2198 PartialDiagnostic PD = PDiag(DiagID: diag::err_target_unsupported_type);
2199 if (D)
2200 PD << D;
2201 else
2202 PD << "expression";
2203 targetDiag(Loc, PD, FD)
2204 << false /*show bit size*/ << 0 /*bitsize*/ << false /*return*/
2205 << Ty << Context.getTargetInfo().getTriple().str();
2206 }
2207 return;
2208 }
2209
2210 // Check if we are dealing with two 'long double' but with different
2211 // semantics.
2212 bool LongDoubleMismatched = false;
2213 if (Ty->isRealFloatingType() && Context.getTypeSize(T: Ty) == 128) {
2214 const llvm::fltSemantics &Sem = Context.getFloatTypeSemantics(T: Ty);
2215 if ((&Sem != &llvm::APFloat::PPCDoubleDouble() &&
2216 !Context.getTargetInfo().hasFloat128Type()) ||
2217 (&Sem == &llvm::APFloat::PPCDoubleDouble() &&
2218 !Context.getTargetInfo().hasIbm128Type()))
2219 LongDoubleMismatched = true;
2220 }
2221
2222 if ((Ty->isFloat16Type() && !Context.getTargetInfo().hasFloat16Type()) ||
2223 (Ty->isFloat128Type() && !Context.getTargetInfo().hasFloat128Type()) ||
2224 (Ty->isIbm128Type() && !Context.getTargetInfo().hasIbm128Type()) ||
2225 (Ty->isIntegerType() && Context.getTypeSize(T: Ty) == 128 &&
2226 !Context.getTargetInfo().hasInt128Type()) ||
2227 (Ty->isBFloat16Type() && !Context.getTargetInfo().hasBFloat16Type() &&
2228 !LangOpts.CUDAIsDevice) ||
2229 LongDoubleMismatched) {
2230 PartialDiagnostic PD = PDiag(DiagID: diag::err_target_unsupported_type);
2231 if (D)
2232 PD << D;
2233 else
2234 PD << "expression";
2235
2236 if (targetDiag(Loc, PD, FD)
2237 << true /*show bit size*/
2238 << static_cast<unsigned>(Context.getTypeSize(T: Ty)) << Ty
2239 << false /*return*/ << Context.getTargetInfo().getTriple().str()) {
2240 if (D)
2241 D->setInvalidDecl();
2242 }
2243 if (D)
2244 targetDiag(Loc: D->getLocation(), DiagID: diag::note_defined_here, FD) << D;
2245 }
2246 };
2247
2248 auto CheckType = [&](QualType Ty, bool IsRetTy = false) {
2249 if (LangOpts.SYCLIsDevice ||
2250 (LangOpts.OpenMP && LangOpts.OpenMPIsTargetDevice) ||
2251 LangOpts.CUDAIsDevice)
2252 CheckDeviceType(Ty);
2253
2254 QualType UnqualTy = Ty.getCanonicalType().getUnqualifiedType();
2255 const TargetInfo &TI = Context.getTargetInfo();
2256 if (!TI.hasLongDoubleType() && UnqualTy == Context.LongDoubleTy) {
2257 PartialDiagnostic PD = PDiag(DiagID: diag::err_target_unsupported_type);
2258 if (D)
2259 PD << D;
2260 else
2261 PD << "expression";
2262
2263 if (Diag(Loc, PD) << false /*show bit size*/ << 0 << Ty
2264 << false /*return*/
2265 << TI.getTriple().str()) {
2266 if (D)
2267 D->setInvalidDecl();
2268 }
2269 if (D)
2270 targetDiag(Loc: D->getLocation(), DiagID: diag::note_defined_here, FD) << D;
2271 }
2272
2273 bool IsDouble = UnqualTy == Context.DoubleTy;
2274 bool IsFloat = UnqualTy == Context.FloatTy;
2275 if (IsRetTy && !TI.hasFPReturn() && (IsDouble || IsFloat)) {
2276 PartialDiagnostic PD = PDiag(DiagID: diag::err_target_unsupported_type);
2277 if (D)
2278 PD << D;
2279 else
2280 PD << "expression";
2281
2282 if (Diag(Loc, PD) << false /*show bit size*/ << 0 << Ty << true /*return*/
2283 << TI.getTriple().str()) {
2284 if (D)
2285 D->setInvalidDecl();
2286 }
2287 if (D)
2288 targetDiag(Loc: D->getLocation(), DiagID: diag::note_defined_here, FD) << D;
2289 }
2290
2291 if (TI.hasRISCVVTypes() && Ty->isRVVSizelessBuiltinType() && FD) {
2292 llvm::StringMap<bool> CallerFeatureMap;
2293 Context.getFunctionFeatureMap(FeatureMap&: CallerFeatureMap, FD);
2294 RISCV().checkRVVTypeSupport(Ty, Loc, D, FeatureMap: CallerFeatureMap);
2295 }
2296
2297 // Don't allow SVE types in functions without a SVE target.
2298 if (Ty->isSVESizelessBuiltinType() && FD) {
2299 llvm::StringMap<bool> CallerFeatureMap;
2300 Context.getFunctionFeatureMap(FeatureMap&: CallerFeatureMap, FD);
2301 ARM().checkSVETypeSupport(Ty, Loc, FD, FeatureMap: CallerFeatureMap);
2302 }
2303
2304 if (auto *VT = Ty->getAs<VectorType>();
2305 VT && FD &&
2306 (VT->getVectorKind() == VectorKind::SveFixedLengthData ||
2307 VT->getVectorKind() == VectorKind::SveFixedLengthPredicate) &&
2308 (LangOpts.VScaleMin != LangOpts.VScaleStreamingMin ||
2309 LangOpts.VScaleMax != LangOpts.VScaleStreamingMax)) {
2310 if (IsArmStreamingFunction(FD, /*IncludeLocallyStreaming=*/true)) {
2311 Diag(Loc, DiagID: diag::err_sve_fixed_vector_in_streaming_function)
2312 << Ty << /*Streaming*/ 0;
2313 } else if (const auto *FTy = FD->getType()->getAs<FunctionProtoType>()) {
2314 if (FTy->getAArch64SMEAttributes() &
2315 FunctionType::SME_PStateSMCompatibleMask) {
2316 Diag(Loc, DiagID: diag::err_sve_fixed_vector_in_streaming_function)
2317 << Ty << /*StreamingCompatible*/ 1;
2318 }
2319 }
2320 }
2321 };
2322
2323 CheckType(Ty);
2324 if (const auto *FPTy = dyn_cast<FunctionProtoType>(Val&: Ty)) {
2325 for (const auto &ParamTy : FPTy->param_types())
2326 CheckType(ParamTy);
2327 CheckType(FPTy->getReturnType(), /*IsRetTy=*/true);
2328 }
2329 if (const auto *FNPTy = dyn_cast<FunctionNoProtoType>(Val&: Ty))
2330 CheckType(FNPTy->getReturnType(), /*IsRetTy=*/true);
2331}
2332
2333bool Sema::findMacroSpelling(SourceLocation &locref, StringRef name) {
2334 SourceLocation loc = locref;
2335 if (!loc.isMacroID()) return false;
2336
2337 // There's no good way right now to look at the intermediate
2338 // expansions, so just jump to the expansion location.
2339 loc = getSourceManager().getExpansionLoc(Loc: loc);
2340
2341 // If that's written with the name, stop here.
2342 SmallString<16> buffer;
2343 if (getPreprocessor().getSpelling(loc, buffer) == name) {
2344 locref = loc;
2345 return true;
2346 }
2347 return false;
2348}
2349
2350Scope *Sema::getScopeForContext(DeclContext *Ctx) {
2351
2352 if (!Ctx)
2353 return nullptr;
2354
2355 Ctx = Ctx->getPrimaryContext();
2356 for (Scope *S = getCurScope(); S; S = S->getParent()) {
2357 // Ignore scopes that cannot have declarations. This is important for
2358 // out-of-line definitions of static class members.
2359 if (S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope))
2360 if (DeclContext *Entity = S->getEntity())
2361 if (Ctx == Entity->getPrimaryContext())
2362 return S;
2363 }
2364
2365 return nullptr;
2366}
2367
2368/// Enter a new function scope
2369void Sema::PushFunctionScope() {
2370 if (FunctionScopes.empty() && CachedFunctionScope) {
2371 // Use CachedFunctionScope to avoid allocating memory when possible.
2372 CachedFunctionScope->Clear();
2373 FunctionScopes.push_back(Elt: CachedFunctionScope.release());
2374 } else {
2375 FunctionScopes.push_back(Elt: new FunctionScopeInfo(getDiagnostics()));
2376 }
2377 if (LangOpts.OpenMP)
2378 OpenMP().pushOpenMPFunctionRegion();
2379}
2380
2381void Sema::PushBlockScope(Scope *BlockScope, BlockDecl *Block) {
2382 FunctionScopes.push_back(Elt: new BlockScopeInfo(getDiagnostics(),
2383 BlockScope, Block));
2384 CapturingFunctionScopes++;
2385}
2386
2387LambdaScopeInfo *Sema::PushLambdaScope() {
2388 LambdaScopeInfo *const LSI = new LambdaScopeInfo(getDiagnostics());
2389 FunctionScopes.push_back(Elt: LSI);
2390 CapturingFunctionScopes++;
2391 return LSI;
2392}
2393
2394void Sema::RecordParsingTemplateParameterDepth(unsigned Depth) {
2395 if (LambdaScopeInfo *const LSI = getCurLambda()) {
2396 LSI->AutoTemplateParameterDepth = Depth;
2397 return;
2398 }
2399 llvm_unreachable(
2400 "Remove assertion if intentionally called in a non-lambda context.");
2401}
2402
2403// Check that the type of the VarDecl has an accessible copy constructor and
2404// resolve its destructor's exception specification.
2405// This also performs initialization of block variables when they are moved
2406// to the heap. It uses the same rules as applicable for implicit moves
2407// according to the C++ standard in effect ([class.copy.elision]p3).
2408static void checkEscapingByref(VarDecl *VD, Sema &S) {
2409 QualType T = VD->getType();
2410 EnterExpressionEvaluationContext scope(
2411 S, Sema::ExpressionEvaluationContext::PotentiallyEvaluated);
2412 SourceLocation Loc = VD->getLocation();
2413 Expr *VarRef =
2414 new (S.Context) DeclRefExpr(S.Context, VD, false, T, VK_LValue, Loc);
2415 ExprResult Result;
2416 auto IE = InitializedEntity::InitializeBlock(BlockVarLoc: Loc, Type: T);
2417 if (S.getLangOpts().CPlusPlus23) {
2418 auto *E = ImplicitCastExpr::Create(Context: S.Context, T, Kind: CK_NoOp, Operand: VarRef, BasePath: nullptr,
2419 Cat: VK_XValue, FPO: FPOptionsOverride());
2420 Result = S.PerformCopyInitialization(Entity: IE, EqualLoc: SourceLocation(), Init: E);
2421 } else {
2422 Result = S.PerformMoveOrCopyInitialization(
2423 Entity: IE, NRInfo: Sema::NamedReturnInfo{.Candidate: VD, .S: Sema::NamedReturnInfo::MoveEligible},
2424 Value: VarRef);
2425 }
2426
2427 if (!Result.isInvalid()) {
2428 Result = S.MaybeCreateExprWithCleanups(SubExpr: Result);
2429 Expr *Init = Result.getAs<Expr>();
2430 S.Context.setBlockVarCopyInit(VD, CopyExpr: Init, CanThrow: S.canThrow(E: Init));
2431 }
2432
2433 // The destructor's exception specification is needed when IRGen generates
2434 // block copy/destroy functions. Resolve it here.
2435 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
2436 if (CXXDestructorDecl *DD = RD->getDestructor()) {
2437 auto *FPT = DD->getType()->castAs<FunctionProtoType>();
2438 S.ResolveExceptionSpec(Loc, FPT);
2439 }
2440}
2441
2442static void markEscapingByrefs(const FunctionScopeInfo &FSI, Sema &S) {
2443 // Set the EscapingByref flag of __block variables captured by
2444 // escaping blocks.
2445 for (const BlockDecl *BD : FSI.Blocks) {
2446 for (const BlockDecl::Capture &BC : BD->captures()) {
2447 VarDecl *VD = BC.getVariable();
2448 if (VD->hasAttr<BlocksAttr>()) {
2449 // Nothing to do if this is a __block variable captured by a
2450 // non-escaping block.
2451 if (BD->doesNotEscape())
2452 continue;
2453 VD->setEscapingByref();
2454 }
2455 // Check whether the captured variable is or contains an object of
2456 // non-trivial C union type.
2457 QualType CapType = BC.getVariable()->getType();
2458 if (CapType.hasNonTrivialToPrimitiveDestructCUnion() ||
2459 CapType.hasNonTrivialToPrimitiveCopyCUnion())
2460 S.checkNonTrivialCUnion(QT: BC.getVariable()->getType(),
2461 Loc: BD->getCaretLocation(),
2462 UseContext: NonTrivialCUnionContext::BlockCapture,
2463 NonTrivialKind: Sema::NTCUK_Destruct | Sema::NTCUK_Copy);
2464 }
2465 }
2466
2467 for (VarDecl *VD : FSI.ByrefBlockVars) {
2468 // __block variables might require us to capture a copy-initializer.
2469 if (!VD->isEscapingByref())
2470 continue;
2471 // It's currently invalid to ever have a __block variable with an
2472 // array type; should we diagnose that here?
2473 // Regardless, we don't want to ignore array nesting when
2474 // constructing this copy.
2475 if (VD->getType()->isStructureOrClassType())
2476 checkEscapingByref(VD, S);
2477 }
2478}
2479
2480Sema::PoppedFunctionScopePtr
2481Sema::PopFunctionScopeInfo(const AnalysisBasedWarnings::Policy *WP, Decl *D,
2482 QualType BlockType) {
2483 assert(!FunctionScopes.empty() && "mismatched push/pop!");
2484
2485 markEscapingByrefs(FSI: *FunctionScopes.back(), S&: *this);
2486
2487 PoppedFunctionScopePtr Scope(FunctionScopes.pop_back_val(),
2488 PoppedFunctionScopeDeleter(this));
2489
2490 if (LangOpts.OpenMP)
2491 OpenMP().popOpenMPFunctionRegion(OldFSI: Scope.get());
2492
2493 // Issue any analysis-based warnings.
2494 if (WP && D) {
2495 inferNoReturnAttr(S&: *this, D);
2496 AnalysisWarnings.IssueWarnings(P: *WP, fscope: Scope.get(), D, BlockType);
2497 } else
2498 for (const auto &PUD : Scope->PossiblyUnreachableDiags)
2499 Diag(Loc: PUD.Loc, PD: PUD.PD);
2500
2501 return Scope;
2502}
2503
2504void Sema::PoppedFunctionScopeDeleter::
2505operator()(sema::FunctionScopeInfo *Scope) const {
2506 if (!Scope->isPlainFunction())
2507 Self->CapturingFunctionScopes--;
2508 // Stash the function scope for later reuse if it's for a normal function.
2509 if (Scope->isPlainFunction() && !Self->CachedFunctionScope)
2510 Self->CachedFunctionScope.reset(p: Scope);
2511 else
2512 delete Scope;
2513}
2514
2515void Sema::PushCompoundScope(bool IsStmtExpr) {
2516 getCurFunction()->CompoundScopes.push_back(
2517 Elt: CompoundScopeInfo(IsStmtExpr, getCurFPFeatures()));
2518}
2519
2520void Sema::PopCompoundScope() {
2521 FunctionScopeInfo *CurFunction = getCurFunction();
2522 assert(!CurFunction->CompoundScopes.empty() && "mismatched push/pop");
2523
2524 CurFunction->CompoundScopes.pop_back();
2525}
2526
2527bool Sema::hasAnyUnrecoverableErrorsInThisFunction() const {
2528 return getCurFunction()->hasUnrecoverableErrorOccurred();
2529}
2530
2531void Sema::setFunctionHasBranchIntoScope() {
2532 if (!FunctionScopes.empty())
2533 FunctionScopes.back()->setHasBranchIntoScope();
2534}
2535
2536void Sema::setFunctionHasBranchProtectedScope() {
2537 if (!FunctionScopes.empty())
2538 FunctionScopes.back()->setHasBranchProtectedScope();
2539}
2540
2541void Sema::setFunctionHasIndirectGoto() {
2542 if (!FunctionScopes.empty())
2543 FunctionScopes.back()->setHasIndirectGoto();
2544}
2545
2546void Sema::setFunctionHasMustTail() {
2547 if (!FunctionScopes.empty())
2548 FunctionScopes.back()->setHasMustTail();
2549}
2550
2551BlockScopeInfo *Sema::getCurBlock() {
2552 if (FunctionScopes.empty())
2553 return nullptr;
2554
2555 auto CurBSI = dyn_cast<BlockScopeInfo>(Val: FunctionScopes.back());
2556 if (CurBSI && CurBSI->TheDecl &&
2557 !CurBSI->TheDecl->Encloses(DC: CurContext)) {
2558 // We have switched contexts due to template instantiation.
2559 assert(!CodeSynthesisContexts.empty());
2560 return nullptr;
2561 }
2562
2563 return CurBSI;
2564}
2565
2566FunctionScopeInfo *Sema::getEnclosingFunction() const {
2567 if (FunctionScopes.empty())
2568 return nullptr;
2569
2570 for (int e = FunctionScopes.size() - 1; e >= 0; --e) {
2571 if (isa<sema::BlockScopeInfo>(Val: FunctionScopes[e]))
2572 continue;
2573 return FunctionScopes[e];
2574 }
2575 return nullptr;
2576}
2577
2578CapturingScopeInfo *Sema::getEnclosingLambdaOrBlock() const {
2579 for (auto *Scope : llvm::reverse(C: FunctionScopes)) {
2580 if (auto *CSI = dyn_cast<CapturingScopeInfo>(Val: Scope)) {
2581 auto *LSI = dyn_cast<LambdaScopeInfo>(Val: CSI);
2582 if (LSI && LSI->Lambda && !LSI->Lambda->Encloses(DC: CurContext) &&
2583 LSI->AfterParameterList) {
2584 // We have switched contexts due to template instantiation.
2585 // FIXME: We should swap out the FunctionScopes during code synthesis
2586 // so that we don't need to check for this.
2587 assert(!CodeSynthesisContexts.empty());
2588 return nullptr;
2589 }
2590 return CSI;
2591 }
2592 }
2593 return nullptr;
2594}
2595
2596LambdaScopeInfo *Sema::getCurLambda(bool IgnoreNonLambdaCapturingScope) {
2597 if (FunctionScopes.empty())
2598 return nullptr;
2599
2600 auto I = FunctionScopes.rbegin();
2601 if (IgnoreNonLambdaCapturingScope) {
2602 auto E = FunctionScopes.rend();
2603 while (I != E && isa<CapturingScopeInfo>(Val: *I) && !isa<LambdaScopeInfo>(Val: *I))
2604 ++I;
2605 if (I == E)
2606 return nullptr;
2607 }
2608 auto *CurLSI = dyn_cast<LambdaScopeInfo>(Val: *I);
2609 if (CurLSI && CurLSI->Lambda && CurLSI->CallOperator &&
2610 !CurLSI->Lambda->Encloses(DC: CurContext) && CurLSI->AfterParameterList) {
2611 // We have switched contexts due to template instantiation.
2612 assert(!CodeSynthesisContexts.empty());
2613 return nullptr;
2614 }
2615
2616 return CurLSI;
2617}
2618
2619// We have a generic lambda if we parsed auto parameters, or we have
2620// an associated template parameter list.
2621LambdaScopeInfo *Sema::getCurGenericLambda() {
2622 if (LambdaScopeInfo *LSI = getCurLambda()) {
2623 return (LSI->TemplateParams.size() ||
2624 LSI->GLTemplateParameterList) ? LSI : nullptr;
2625 }
2626 return nullptr;
2627}
2628
2629
2630void Sema::ActOnComment(SourceRange Comment) {
2631 if (!LangOpts.RetainCommentsFromSystemHeaders &&
2632 SourceMgr.isInSystemHeader(Loc: Comment.getBegin()))
2633 return;
2634 RawComment RC(SourceMgr, Comment, LangOpts.CommentOpts, false);
2635 if (RC.isAlmostTrailingComment() || RC.hasUnsupportedSplice(SourceMgr)) {
2636 SourceRange MagicMarkerRange(Comment.getBegin(),
2637 Comment.getBegin().getLocWithOffset(Offset: 3));
2638 StringRef MagicMarkerText;
2639 switch (RC.getKind()) {
2640 case RawComment::RCK_OrdinaryBCPL:
2641 MagicMarkerText = "///<";
2642 break;
2643 case RawComment::RCK_OrdinaryC:
2644 MagicMarkerText = "/**<";
2645 break;
2646 case RawComment::RCK_Invalid:
2647 // FIXME: are there other scenarios that could produce an invalid
2648 // raw comment here?
2649 Diag(Loc: Comment.getBegin(), DiagID: diag::warn_splice_in_doxygen_comment);
2650 return;
2651 default:
2652 llvm_unreachable("if this is an almost Doxygen comment, "
2653 "it should be ordinary");
2654 }
2655 Diag(Loc: Comment.getBegin(), DiagID: diag::warn_not_a_doxygen_trailing_member_comment) <<
2656 FixItHint::CreateReplacement(RemoveRange: MagicMarkerRange, Code: MagicMarkerText);
2657 }
2658 Context.addComment(RC);
2659}
2660
2661// Pin this vtable to this file.
2662ExternalSemaSource::~ExternalSemaSource() {}
2663char ExternalSemaSource::ID;
2664
2665void ExternalSemaSource::ReadMethodPool(Selector Sel) { }
2666void ExternalSemaSource::updateOutOfDateSelector(Selector Sel) { }
2667
2668void ExternalSemaSource::ReadKnownNamespaces(
2669 SmallVectorImpl<NamespaceDecl *> &Namespaces) {
2670}
2671
2672void ExternalSemaSource::ReadUndefinedButUsed(
2673 llvm::MapVector<NamedDecl *, SourceLocation> &Undefined) {}
2674
2675void ExternalSemaSource::ReadMismatchingDeleteExpressions(llvm::MapVector<
2676 FieldDecl *, llvm::SmallVector<std::pair<SourceLocation, bool>, 4>> &) {}
2677
2678bool Sema::tryExprAsCall(Expr &E, QualType &ZeroArgCallReturnTy,
2679 UnresolvedSetImpl &OverloadSet) {
2680 ZeroArgCallReturnTy = QualType();
2681 OverloadSet.clear();
2682
2683 const OverloadExpr *Overloads = nullptr;
2684 bool IsMemExpr = false;
2685 if (E.getType() == Context.OverloadTy) {
2686 OverloadExpr::FindResult FR = OverloadExpr::find(E: &E);
2687
2688 // Ignore overloads that are pointer-to-member constants.
2689 if (FR.HasFormOfMemberPointer)
2690 return false;
2691
2692 Overloads = FR.Expression;
2693 } else if (E.getType() == Context.BoundMemberTy) {
2694 Overloads = dyn_cast<UnresolvedMemberExpr>(Val: E.IgnoreParens());
2695 IsMemExpr = true;
2696 }
2697
2698 bool Ambiguous = false;
2699 bool IsMV = false;
2700
2701 if (Overloads) {
2702 for (OverloadExpr::decls_iterator it = Overloads->decls_begin(),
2703 DeclsEnd = Overloads->decls_end(); it != DeclsEnd; ++it) {
2704 OverloadSet.addDecl(D: *it);
2705
2706 // Check whether the function is a non-template, non-member which takes no
2707 // arguments.
2708 if (IsMemExpr)
2709 continue;
2710 if (const FunctionDecl *OverloadDecl
2711 = dyn_cast<FunctionDecl>(Val: (*it)->getUnderlyingDecl())) {
2712 if (OverloadDecl->getMinRequiredArguments() == 0) {
2713 if (!ZeroArgCallReturnTy.isNull() && !Ambiguous &&
2714 (!IsMV || !(OverloadDecl->isCPUDispatchMultiVersion() ||
2715 OverloadDecl->isCPUSpecificMultiVersion()))) {
2716 ZeroArgCallReturnTy = QualType();
2717 Ambiguous = true;
2718 } else {
2719 ZeroArgCallReturnTy = OverloadDecl->getReturnType();
2720 IsMV = OverloadDecl->isCPUDispatchMultiVersion() ||
2721 OverloadDecl->isCPUSpecificMultiVersion();
2722 }
2723 }
2724 }
2725 }
2726
2727 // If it's not a member, use better machinery to try to resolve the call
2728 if (!IsMemExpr)
2729 return !ZeroArgCallReturnTy.isNull();
2730 }
2731
2732 // Attempt to call the member with no arguments - this will correctly handle
2733 // member templates with defaults/deduction of template arguments, overloads
2734 // with default arguments, etc.
2735 if (IsMemExpr && !E.isTypeDependent()) {
2736 Sema::TentativeAnalysisScope Trap(*this);
2737 ExprResult R = BuildCallToMemberFunction(S: nullptr, MemExpr: &E, LParenLoc: SourceLocation(), Args: {},
2738 RParenLoc: SourceLocation());
2739 if (R.isUsable()) {
2740 ZeroArgCallReturnTy = R.get()->getType();
2741 return true;
2742 }
2743 return false;
2744 }
2745
2746 if (const auto *DeclRef = dyn_cast<DeclRefExpr>(Val: E.IgnoreParens())) {
2747 if (const auto *Fun = dyn_cast<FunctionDecl>(Val: DeclRef->getDecl())) {
2748 if (Fun->getMinRequiredArguments() == 0)
2749 ZeroArgCallReturnTy = Fun->getReturnType();
2750 return true;
2751 }
2752 }
2753
2754 // We don't have an expression that's convenient to get a FunctionDecl from,
2755 // but we can at least check if the type is "function of 0 arguments".
2756 QualType ExprTy = E.getType();
2757 const FunctionType *FunTy = nullptr;
2758 QualType PointeeTy = ExprTy->getPointeeType();
2759 if (!PointeeTy.isNull())
2760 FunTy = PointeeTy->getAs<FunctionType>();
2761 if (!FunTy)
2762 FunTy = ExprTy->getAs<FunctionType>();
2763
2764 if (const auto *FPT = dyn_cast_if_present<FunctionProtoType>(Val: FunTy)) {
2765 if (FPT->getNumParams() == 0)
2766 ZeroArgCallReturnTy = FunTy->getReturnType();
2767 return true;
2768 }
2769 return false;
2770}
2771
2772/// Give notes for a set of overloads.
2773///
2774/// A companion to tryExprAsCall. In cases when the name that the programmer
2775/// wrote was an overloaded function, we may be able to make some guesses about
2776/// plausible overloads based on their return types; such guesses can be handed
2777/// off to this method to be emitted as notes.
2778///
2779/// \param Overloads - The overloads to note.
2780/// \param FinalNoteLoc - If we've suppressed printing some overloads due to
2781/// -fshow-overloads=best, this is the location to attach to the note about too
2782/// many candidates. Typically this will be the location of the original
2783/// ill-formed expression.
2784static void noteOverloads(Sema &S, const UnresolvedSetImpl &Overloads,
2785 const SourceLocation FinalNoteLoc) {
2786 unsigned ShownOverloads = 0;
2787 unsigned SuppressedOverloads = 0;
2788 for (UnresolvedSetImpl::iterator It = Overloads.begin(),
2789 DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
2790 if (ShownOverloads >= S.Diags.getNumOverloadCandidatesToShow()) {
2791 ++SuppressedOverloads;
2792 continue;
2793 }
2794
2795 const NamedDecl *Fn = (*It)->getUnderlyingDecl();
2796 // Don't print overloads for non-default multiversioned functions.
2797 if (const auto *FD = Fn->getAsFunction()) {
2798 if (FD->isMultiVersion() && FD->hasAttr<TargetAttr>() &&
2799 !FD->getAttr<TargetAttr>()->isDefaultVersion())
2800 continue;
2801 if (FD->isMultiVersion() && FD->hasAttr<TargetVersionAttr>() &&
2802 !FD->getAttr<TargetVersionAttr>()->isDefaultVersion())
2803 continue;
2804 }
2805 S.Diag(Loc: Fn->getLocation(), DiagID: diag::note_possible_target_of_call);
2806 ++ShownOverloads;
2807 }
2808
2809 S.Diags.overloadCandidatesShown(N: ShownOverloads);
2810
2811 if (SuppressedOverloads)
2812 S.Diag(Loc: FinalNoteLoc, DiagID: diag::note_ovl_too_many_candidates)
2813 << SuppressedOverloads;
2814}
2815
2816static void notePlausibleOverloads(Sema &S, SourceLocation Loc,
2817 const UnresolvedSetImpl &Overloads,
2818 bool (*IsPlausibleResult)(QualType)) {
2819 if (!IsPlausibleResult)
2820 return noteOverloads(S, Overloads, FinalNoteLoc: Loc);
2821
2822 UnresolvedSet<2> PlausibleOverloads;
2823 for (OverloadExpr::decls_iterator It = Overloads.begin(),
2824 DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
2825 const auto *OverloadDecl = cast<FunctionDecl>(Val: *It);
2826 QualType OverloadResultTy = OverloadDecl->getReturnType();
2827 if (IsPlausibleResult(OverloadResultTy))
2828 PlausibleOverloads.addDecl(D: It.getDecl());
2829 }
2830 noteOverloads(S, Overloads: PlausibleOverloads, FinalNoteLoc: Loc);
2831}
2832
2833/// Determine whether the given expression can be called by just
2834/// putting parentheses after it. Notably, expressions with unary
2835/// operators can't be because the unary operator will start parsing
2836/// outside the call.
2837static bool IsCallableWithAppend(const Expr *E) {
2838 E = E->IgnoreImplicit();
2839 return (!isa<CStyleCastExpr>(Val: E) &&
2840 !isa<UnaryOperator>(Val: E) &&
2841 !isa<BinaryOperator>(Val: E) &&
2842 !isa<CXXOperatorCallExpr>(Val: E));
2843}
2844
2845static bool IsCPUDispatchCPUSpecificMultiVersion(const Expr *E) {
2846 if (const auto *UO = dyn_cast<UnaryOperator>(Val: E))
2847 E = UO->getSubExpr();
2848
2849 if (const auto *ULE = dyn_cast<UnresolvedLookupExpr>(Val: E)) {
2850 if (ULE->getNumDecls() == 0)
2851 return false;
2852
2853 const NamedDecl *ND = *ULE->decls_begin();
2854 if (const auto *FD = dyn_cast<FunctionDecl>(Val: ND))
2855 return FD->isCPUDispatchMultiVersion() || FD->isCPUSpecificMultiVersion();
2856 }
2857 return false;
2858}
2859
2860bool Sema::tryToRecoverWithCall(ExprResult &E, const PartialDiagnostic &PD,
2861 bool ForceComplain,
2862 bool (*IsPlausibleResult)(QualType)) {
2863 SourceLocation Loc = E.get()->getExprLoc();
2864 SourceRange Range = E.get()->getSourceRange();
2865 UnresolvedSet<4> Overloads;
2866
2867 // If this is a SFINAE context, don't try anything that might trigger ADL
2868 // prematurely.
2869 if (!isSFINAEContext()) {
2870 QualType ZeroArgCallTy;
2871 if (tryExprAsCall(E&: *E.get(), ZeroArgCallReturnTy&: ZeroArgCallTy, OverloadSet&: Overloads) &&
2872 !ZeroArgCallTy.isNull() &&
2873 (!IsPlausibleResult || IsPlausibleResult(ZeroArgCallTy))) {
2874 // At this point, we know E is potentially callable with 0
2875 // arguments and that it returns something of a reasonable type,
2876 // so we can emit a fixit and carry on pretending that E was
2877 // actually a CallExpr.
2878 SourceLocation ParenInsertionLoc = getLocForEndOfToken(Loc: Range.getEnd());
2879 bool IsMV = IsCPUDispatchCPUSpecificMultiVersion(E: E.get());
2880 Diag(Loc, PD) << /*zero-arg*/ 1 << IsMV << Range
2881 << (IsCallableWithAppend(E: E.get())
2882 ? FixItHint::CreateInsertion(InsertionLoc: ParenInsertionLoc,
2883 Code: "()")
2884 : FixItHint());
2885 if (!IsMV)
2886 notePlausibleOverloads(S&: *this, Loc, Overloads, IsPlausibleResult);
2887
2888 // FIXME: Try this before emitting the fixit, and suppress diagnostics
2889 // while doing so.
2890 E = BuildCallExpr(S: nullptr, Fn: E.get(), LParenLoc: Range.getEnd(), ArgExprs: {},
2891 RParenLoc: Range.getEnd().getLocWithOffset(Offset: 1));
2892 return true;
2893 }
2894 }
2895 if (!ForceComplain) return false;
2896
2897 bool IsMV = IsCPUDispatchCPUSpecificMultiVersion(E: E.get());
2898 Diag(Loc, PD) << /*not zero-arg*/ 0 << IsMV << Range;
2899 if (!IsMV)
2900 notePlausibleOverloads(S&: *this, Loc, Overloads, IsPlausibleResult);
2901 E = ExprError();
2902 return true;
2903}
2904
2905IdentifierInfo *Sema::getSuperIdentifier() const {
2906 if (!Ident_super)
2907 Ident_super = &Context.Idents.get(Name: "super");
2908 return Ident_super;
2909}
2910
2911void Sema::PushCapturedRegionScope(Scope *S, CapturedDecl *CD, RecordDecl *RD,
2912 CapturedRegionKind K,
2913 unsigned OpenMPCaptureLevel) {
2914 auto *CSI = new CapturedRegionScopeInfo(
2915 getDiagnostics(), S, CD, RD, CD->getContextParam(), K,
2916 (getLangOpts().OpenMP && K == CR_OpenMP)
2917 ? OpenMP().getOpenMPNestingLevel()
2918 : 0,
2919 OpenMPCaptureLevel);
2920 CSI->ReturnType = Context.VoidTy;
2921 FunctionScopes.push_back(Elt: CSI);
2922 CapturingFunctionScopes++;
2923}
2924
2925CapturedRegionScopeInfo *Sema::getCurCapturedRegion() {
2926 if (FunctionScopes.empty())
2927 return nullptr;
2928
2929 return dyn_cast<CapturedRegionScopeInfo>(Val: FunctionScopes.back());
2930}
2931
2932const llvm::MapVector<FieldDecl *, Sema::DeleteLocs> &
2933Sema::getMismatchingDeleteExpressions() const {
2934 return DeleteExprs;
2935}
2936
2937Sema::FPFeaturesStateRAII::FPFeaturesStateRAII(Sema &S)
2938 : S(S), OldFPFeaturesState(S.CurFPFeatures),
2939 OldOverrides(S.FpPragmaStack.CurrentValue),
2940 OldEvalMethod(S.PP.getCurrentFPEvalMethod()),
2941 OldFPPragmaLocation(S.PP.getLastFPEvalPragmaLocation()) {}
2942
2943Sema::FPFeaturesStateRAII::~FPFeaturesStateRAII() {
2944 S.CurFPFeatures = OldFPFeaturesState;
2945 S.FpPragmaStack.CurrentValue = OldOverrides;
2946 S.PP.setCurrentFPEvalMethod(PragmaLoc: OldFPPragmaLocation, Val: OldEvalMethod);
2947}
2948
2949bool Sema::isDeclaratorFunctionLike(Declarator &D) {
2950 assert(D.getCXXScopeSpec().isSet() &&
2951 "can only be called for qualified names");
2952
2953 auto LR = LookupResult(*this, D.getIdentifier(), D.getBeginLoc(),
2954 LookupOrdinaryName, forRedeclarationInCurContext());
2955 DeclContext *DC = computeDeclContext(SS: D.getCXXScopeSpec(),
2956 EnteringContext: !D.getDeclSpec().isFriendSpecified());
2957 if (!DC)
2958 return false;
2959
2960 LookupQualifiedName(R&: LR, LookupCtx: DC);
2961 bool Result = llvm::all_of(Range&: LR, P: [](Decl *Dcl) {
2962 if (NamedDecl *ND = dyn_cast<NamedDecl>(Val: Dcl)) {
2963 ND = ND->getUnderlyingDecl();
2964 return isa<FunctionDecl>(Val: ND) || isa<FunctionTemplateDecl>(Val: ND) ||
2965 isa<UsingDecl>(Val: ND);
2966 }
2967 return false;
2968 });
2969 return Result;
2970}
2971
2972Attr *Sema::CreateAnnotationAttr(const AttributeCommonInfo &CI, StringRef Annot,
2973 MutableArrayRef<Expr *> Args) {
2974
2975 auto *A = AnnotateAttr::Create(Ctx&: Context, Annotation: Annot, Args: Args.data(), ArgsSize: Args.size(), CommonInfo: CI);
2976 if (!ConstantFoldAttrArgs(
2977 CI, Args: MutableArrayRef<Expr *>(A->args_begin(), A->args_end()))) {
2978 return nullptr;
2979 }
2980 return A;
2981}
2982
2983Attr *Sema::CreateAnnotationAttr(const ParsedAttr &AL) {
2984 // Make sure that there is a string literal as the annotation's first
2985 // argument.
2986 StringRef Str;
2987 if (!checkStringLiteralArgumentAttr(Attr: AL, ArgNum: 0, Str))
2988 return nullptr;
2989
2990 llvm::SmallVector<Expr *, 4> Args;
2991 Args.reserve(N: AL.getNumArgs() - 1);
2992 for (unsigned Idx = 1; Idx < AL.getNumArgs(); Idx++) {
2993 assert(!AL.isArgIdent(Idx));
2994 Args.push_back(Elt: AL.getArgAsExpr(Arg: Idx));
2995 }
2996
2997 return CreateAnnotationAttr(CI: AL, Annot: Str, Args);
2998}
2999