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