xref: /llvm-project/clang/lib/Frontend/FrontendActions.cpp (revision 28ad8978ee2054298d4198bf10c8cb68730af037) 
1 //===--- FrontendActions.cpp ----------------------------------------------===//
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 #include "clang/Frontend/FrontendActions.h"
10 #include "clang/AST/ASTConsumer.h"
11 #include "clang/AST/Decl.h"
12 #include "clang/Basic/FileManager.h"
13 #include "clang/Basic/LangStandard.h"
14 #include "clang/Basic/Module.h"
15 #include "clang/Basic/TargetInfo.h"
16 #include "clang/Frontend/ASTConsumers.h"
17 #include "clang/Frontend/CompilerInstance.h"
18 #include "clang/Frontend/FrontendDiagnostic.h"
19 #include "clang/Frontend/MultiplexConsumer.h"
20 #include "clang/Frontend/Utils.h"
21 #include "clang/Lex/DependencyDirectivesScanner.h"
22 #include "clang/Lex/HeaderSearch.h"
23 #include "clang/Lex/Preprocessor.h"
24 #include "clang/Lex/PreprocessorOptions.h"
25 #include "clang/Sema/TemplateInstCallback.h"
26 #include "clang/Serialization/ASTReader.h"
27 #include "clang/Serialization/ASTWriter.h"
28 #include "clang/Serialization/ModuleFile.h"
29 #include "llvm/Config/llvm-config.h" // for LLVM_HOST_TRIPLE
30 #include "llvm/Support/ErrorHandling.h"
31 #include "llvm/Support/FileSystem.h"
32 #include "llvm/Support/MemoryBuffer.h"
33 #include "llvm/Support/Path.h"
34 #include "llvm/Support/YAMLTraits.h"
35 #include "llvm/Support/raw_ostream.h"
36 #include <memory>
37 #include <optional>
38 #include <system_error>
39 
40 using namespace clang;
41 
42 namespace {
43 CodeCompleteConsumer *GetCodeCompletionConsumer(CompilerInstance &CI) {
44   return CI.hasCodeCompletionConsumer() ? &CI.getCodeCompletionConsumer()
45                                         : nullptr;
46 }
47 
48 void EnsureSemaIsCreated(CompilerInstance &CI, FrontendAction &Action) {
49   if (Action.hasCodeCompletionSupport() &&
50       !CI.getFrontendOpts().CodeCompletionAt.FileName.empty())
51     CI.createCodeCompletionConsumer();
52 
53   if (!CI.hasSema())
54     CI.createSema(Action.getTranslationUnitKind(),
55                   GetCodeCompletionConsumer(CI));
56 }
57 } // namespace
58 
59 //===----------------------------------------------------------------------===//
60 // Custom Actions
61 //===----------------------------------------------------------------------===//
62 
63 std::unique_ptr<ASTConsumer>
64 InitOnlyAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
65   return std::make_unique<ASTConsumer>();
66 }
67 
68 void InitOnlyAction::ExecuteAction() {
69 }
70 
71 // Basically PreprocessOnlyAction::ExecuteAction.
72 void ReadPCHAndPreprocessAction::ExecuteAction() {
73   Preprocessor &PP = getCompilerInstance().getPreprocessor();
74 
75   // Ignore unknown pragmas.
76   PP.IgnorePragmas();
77 
78   Token Tok;
79   // Start parsing the specified input file.
80   PP.EnterMainSourceFile();
81   do {
82     PP.Lex(Tok);
83   } while (Tok.isNot(tok::eof));
84 }
85 
86 std::unique_ptr<ASTConsumer>
87 ReadPCHAndPreprocessAction::CreateASTConsumer(CompilerInstance &CI,
88                                               StringRef InFile) {
89   return std::make_unique<ASTConsumer>();
90 }
91 
92 //===----------------------------------------------------------------------===//
93 // AST Consumer Actions
94 //===----------------------------------------------------------------------===//
95 
96 std::unique_ptr<ASTConsumer>
97 ASTPrintAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
98   if (std::unique_ptr<raw_ostream> OS =
99           CI.createDefaultOutputFile(false, InFile))
100     return CreateASTPrinter(std::move(OS), CI.getFrontendOpts().ASTDumpFilter);
101   return nullptr;
102 }
103 
104 std::unique_ptr<ASTConsumer>
105 ASTDumpAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
106   const FrontendOptions &Opts = CI.getFrontendOpts();
107   return CreateASTDumper(nullptr /*Dump to stdout.*/, Opts.ASTDumpFilter,
108                          Opts.ASTDumpDecls, Opts.ASTDumpAll,
109                          Opts.ASTDumpLookups, Opts.ASTDumpDeclTypes,
110                          Opts.ASTDumpFormat);
111 }
112 
113 std::unique_ptr<ASTConsumer>
114 ASTDeclListAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
115   return CreateASTDeclNodeLister();
116 }
117 
118 std::unique_ptr<ASTConsumer>
119 ASTViewAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
120   return CreateASTViewer();
121 }
122 
123 std::unique_ptr<ASTConsumer>
124 GeneratePCHAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
125   std::string Sysroot;
126   if (!ComputeASTConsumerArguments(CI, /*ref*/ Sysroot))
127     return nullptr;
128 
129   std::string OutputFile;
130   std::unique_ptr<raw_pwrite_stream> OS =
131       CreateOutputFile(CI, InFile, /*ref*/ OutputFile);
132   if (!OS)
133     return nullptr;
134 
135   if (!CI.getFrontendOpts().RelocatablePCH)
136     Sysroot.clear();
137 
138   const auto &FrontendOpts = CI.getFrontendOpts();
139   auto Buffer = std::make_shared<PCHBuffer>();
140   std::vector<std::unique_ptr<ASTConsumer>> Consumers;
141   Consumers.push_back(std::make_unique<PCHGenerator>(
142       CI.getPreprocessor(), CI.getModuleCache(), OutputFile, Sysroot, Buffer,
143       FrontendOpts.ModuleFileExtensions,
144       CI.getPreprocessorOpts().AllowPCHWithCompilerErrors,
145       FrontendOpts.IncludeTimestamps, FrontendOpts.BuildingImplicitModule,
146       +CI.getLangOpts().CacheGeneratedPCH));
147   Consumers.push_back(CI.getPCHContainerWriter().CreatePCHContainerGenerator(
148       CI, std::string(InFile), OutputFile, std::move(OS), Buffer));
149 
150   return std::make_unique<MultiplexConsumer>(std::move(Consumers));
151 }
152 
153 bool GeneratePCHAction::ComputeASTConsumerArguments(CompilerInstance &CI,
154                                                     std::string &Sysroot) {
155   Sysroot = CI.getHeaderSearchOpts().Sysroot;
156   if (CI.getFrontendOpts().RelocatablePCH && Sysroot.empty()) {
157     CI.getDiagnostics().Report(diag::err_relocatable_without_isysroot);
158     return false;
159   }
160 
161   return true;
162 }
163 
164 std::unique_ptr<llvm::raw_pwrite_stream>
165 GeneratePCHAction::CreateOutputFile(CompilerInstance &CI, StringRef InFile,
166                                     std::string &OutputFile) {
167   // Because this is exposed via libclang we must disable RemoveFileOnSignal.
168   std::unique_ptr<raw_pwrite_stream> OS = CI.createDefaultOutputFile(
169       /*Binary=*/true, InFile, /*Extension=*/"", /*RemoveFileOnSignal=*/false);
170   if (!OS)
171     return nullptr;
172 
173   OutputFile = CI.getFrontendOpts().OutputFile;
174   return OS;
175 }
176 
177 bool GeneratePCHAction::shouldEraseOutputFiles() {
178   if (getCompilerInstance().getPreprocessorOpts().AllowPCHWithCompilerErrors)
179     return false;
180   return ASTFrontendAction::shouldEraseOutputFiles();
181 }
182 
183 bool GeneratePCHAction::BeginSourceFileAction(CompilerInstance &CI) {
184   CI.getLangOpts().CompilingPCH = true;
185   return true;
186 }
187 
188 std::vector<std::unique_ptr<ASTConsumer>>
189 GenerateModuleAction::CreateMultiplexConsumer(CompilerInstance &CI,
190                                               StringRef InFile) {
191   std::unique_ptr<raw_pwrite_stream> OS = CreateOutputFile(CI, InFile);
192   if (!OS)
193     return {};
194 
195   std::string OutputFile = CI.getFrontendOpts().OutputFile;
196   std::string Sysroot;
197 
198   auto Buffer = std::make_shared<PCHBuffer>();
199   std::vector<std::unique_ptr<ASTConsumer>> Consumers;
200 
201   Consumers.push_back(std::make_unique<PCHGenerator>(
202       CI.getPreprocessor(), CI.getModuleCache(), OutputFile, Sysroot, Buffer,
203       CI.getFrontendOpts().ModuleFileExtensions,
204       /*AllowASTWithErrors=*/
205       +CI.getFrontendOpts().AllowPCMWithCompilerErrors,
206       /*IncludeTimestamps=*/
207       +CI.getFrontendOpts().BuildingImplicitModule &&
208           +CI.getFrontendOpts().IncludeTimestamps,
209       /*BuildingImplicitModule=*/+CI.getFrontendOpts().BuildingImplicitModule,
210       /*ShouldCacheASTInMemory=*/
211       +CI.getFrontendOpts().BuildingImplicitModule));
212   Consumers.push_back(CI.getPCHContainerWriter().CreatePCHContainerGenerator(
213       CI, std::string(InFile), OutputFile, std::move(OS), Buffer));
214   return Consumers;
215 }
216 
217 std::unique_ptr<ASTConsumer>
218 GenerateModuleAction::CreateASTConsumer(CompilerInstance &CI,
219                                         StringRef InFile) {
220   std::vector<std::unique_ptr<ASTConsumer>> Consumers =
221       CreateMultiplexConsumer(CI, InFile);
222   if (Consumers.empty())
223     return nullptr;
224 
225   return std::make_unique<MultiplexConsumer>(std::move(Consumers));
226 }
227 
228 bool GenerateModuleAction::shouldEraseOutputFiles() {
229   return !getCompilerInstance().getFrontendOpts().AllowPCMWithCompilerErrors &&
230          ASTFrontendAction::shouldEraseOutputFiles();
231 }
232 
233 bool GenerateModuleFromModuleMapAction::BeginSourceFileAction(
234     CompilerInstance &CI) {
235   if (!CI.getLangOpts().Modules) {
236     CI.getDiagnostics().Report(diag::err_module_build_requires_fmodules);
237     return false;
238   }
239 
240   return GenerateModuleAction::BeginSourceFileAction(CI);
241 }
242 
243 std::unique_ptr<raw_pwrite_stream>
244 GenerateModuleFromModuleMapAction::CreateOutputFile(CompilerInstance &CI,
245                                                     StringRef InFile) {
246   // If no output file was provided, figure out where this module would go
247   // in the module cache.
248   if (CI.getFrontendOpts().OutputFile.empty()) {
249     StringRef ModuleMapFile = CI.getFrontendOpts().OriginalModuleMap;
250     if (ModuleMapFile.empty())
251       ModuleMapFile = InFile;
252 
253     HeaderSearch &HS = CI.getPreprocessor().getHeaderSearchInfo();
254     CI.getFrontendOpts().OutputFile =
255         HS.getCachedModuleFileName(CI.getLangOpts().CurrentModule,
256                                    ModuleMapFile);
257   }
258 
259   // Because this is exposed via libclang we must disable RemoveFileOnSignal.
260   return CI.createDefaultOutputFile(/*Binary=*/true, InFile, /*Extension=*/"",
261                                     /*RemoveFileOnSignal=*/false,
262                                     /*CreateMissingDirectories=*/true,
263                                     /*ForceUseTemporary=*/true);
264 }
265 
266 bool GenerateModuleInterfaceAction::BeginSourceFileAction(
267     CompilerInstance &CI) {
268   CI.getLangOpts().setCompilingModule(LangOptions::CMK_ModuleInterface);
269 
270   return GenerateModuleAction::BeginSourceFileAction(CI);
271 }
272 
273 std::unique_ptr<ASTConsumer>
274 GenerateModuleInterfaceAction::CreateASTConsumer(CompilerInstance &CI,
275                                                  StringRef InFile) {
276   std::vector<std::unique_ptr<ASTConsumer>> Consumers;
277 
278   if (CI.getFrontendOpts().GenReducedBMI &&
279       !CI.getFrontendOpts().ModuleOutputPath.empty()) {
280     Consumers.push_back(std::make_unique<ReducedBMIGenerator>(
281         CI.getPreprocessor(), CI.getModuleCache(),
282         CI.getFrontendOpts().ModuleOutputPath,
283         +CI.getFrontendOpts().AllowPCMWithCompilerErrors));
284   }
285 
286   Consumers.push_back(std::make_unique<CXX20ModulesGenerator>(
287       CI.getPreprocessor(), CI.getModuleCache(),
288       CI.getFrontendOpts().OutputFile,
289       +CI.getFrontendOpts().AllowPCMWithCompilerErrors));
290 
291   return std::make_unique<MultiplexConsumer>(std::move(Consumers));
292 }
293 
294 std::unique_ptr<raw_pwrite_stream>
295 GenerateModuleInterfaceAction::CreateOutputFile(CompilerInstance &CI,
296                                                 StringRef InFile) {
297   return CI.createDefaultOutputFile(/*Binary=*/true, InFile, "pcm");
298 }
299 
300 std::unique_ptr<ASTConsumer>
301 GenerateReducedModuleInterfaceAction::CreateASTConsumer(CompilerInstance &CI,
302                                                         StringRef InFile) {
303   return std::make_unique<ReducedBMIGenerator>(CI.getPreprocessor(),
304                                                CI.getModuleCache(),
305                                                CI.getFrontendOpts().OutputFile);
306 }
307 
308 bool GenerateHeaderUnitAction::BeginSourceFileAction(CompilerInstance &CI) {
309   if (!CI.getLangOpts().CPlusPlusModules) {
310     CI.getDiagnostics().Report(diag::err_module_interface_requires_cpp_modules);
311     return false;
312   }
313   CI.getLangOpts().setCompilingModule(LangOptions::CMK_HeaderUnit);
314   return GenerateModuleAction::BeginSourceFileAction(CI);
315 }
316 
317 std::unique_ptr<raw_pwrite_stream>
318 GenerateHeaderUnitAction::CreateOutputFile(CompilerInstance &CI,
319                                            StringRef InFile) {
320   return CI.createDefaultOutputFile(/*Binary=*/true, InFile, "pcm");
321 }
322 
323 SyntaxOnlyAction::~SyntaxOnlyAction() {
324 }
325 
326 std::unique_ptr<ASTConsumer>
327 SyntaxOnlyAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
328   return std::make_unique<ASTConsumer>();
329 }
330 
331 std::unique_ptr<ASTConsumer>
332 DumpModuleInfoAction::CreateASTConsumer(CompilerInstance &CI,
333                                         StringRef InFile) {
334   return std::make_unique<ASTConsumer>();
335 }
336 
337 std::unique_ptr<ASTConsumer>
338 VerifyPCHAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
339   return std::make_unique<ASTConsumer>();
340 }
341 
342 void VerifyPCHAction::ExecuteAction() {
343   CompilerInstance &CI = getCompilerInstance();
344   bool Preamble = CI.getPreprocessorOpts().PrecompiledPreambleBytes.first != 0;
345   const std::string &Sysroot = CI.getHeaderSearchOpts().Sysroot;
346   std::unique_ptr<ASTReader> Reader(new ASTReader(
347       CI.getPreprocessor(), CI.getModuleCache(), &CI.getASTContext(),
348       CI.getPCHContainerReader(), CI.getFrontendOpts().ModuleFileExtensions,
349       Sysroot.empty() ? "" : Sysroot.c_str(),
350       DisableValidationForModuleKind::None,
351       /*AllowASTWithCompilerErrors*/ false,
352       /*AllowConfigurationMismatch*/ true,
353       /*ValidateSystemInputs*/ true));
354 
355   Reader->ReadAST(getCurrentFile(),
356                   Preamble ? serialization::MK_Preamble
357                            : serialization::MK_PCH,
358                   SourceLocation(),
359                   ASTReader::ARR_ConfigurationMismatch);
360 }
361 
362 namespace {
363 struct TemplightEntry {
364   std::string Name;
365   std::string Kind;
366   std::string Event;
367   std::string DefinitionLocation;
368   std::string PointOfInstantiation;
369 };
370 } // namespace
371 
372 namespace llvm {
373 namespace yaml {
374 template <> struct MappingTraits<TemplightEntry> {
375   static void mapping(IO &io, TemplightEntry &fields) {
376     io.mapRequired("name", fields.Name);
377     io.mapRequired("kind", fields.Kind);
378     io.mapRequired("event", fields.Event);
379     io.mapRequired("orig", fields.DefinitionLocation);
380     io.mapRequired("poi", fields.PointOfInstantiation);
381   }
382 };
383 } // namespace yaml
384 } // namespace llvm
385 
386 namespace {
387 class DefaultTemplateInstCallback : public TemplateInstantiationCallback {
388   using CodeSynthesisContext = Sema::CodeSynthesisContext;
389 
390 public:
391   void initialize(const Sema &) override {}
392 
393   void finalize(const Sema &) override {}
394 
395   void atTemplateBegin(const Sema &TheSema,
396                        const CodeSynthesisContext &Inst) override {
397     displayTemplightEntry<true>(llvm::outs(), TheSema, Inst);
398   }
399 
400   void atTemplateEnd(const Sema &TheSema,
401                      const CodeSynthesisContext &Inst) override {
402     displayTemplightEntry<false>(llvm::outs(), TheSema, Inst);
403   }
404 
405 private:
406   static std::string toString(CodeSynthesisContext::SynthesisKind Kind) {
407     switch (Kind) {
408     case CodeSynthesisContext::TemplateInstantiation:
409       return "TemplateInstantiation";
410     case CodeSynthesisContext::DefaultTemplateArgumentInstantiation:
411       return "DefaultTemplateArgumentInstantiation";
412     case CodeSynthesisContext::DefaultFunctionArgumentInstantiation:
413       return "DefaultFunctionArgumentInstantiation";
414     case CodeSynthesisContext::ExplicitTemplateArgumentSubstitution:
415       return "ExplicitTemplateArgumentSubstitution";
416     case CodeSynthesisContext::DeducedTemplateArgumentSubstitution:
417       return "DeducedTemplateArgumentSubstitution";
418     case CodeSynthesisContext::LambdaExpressionSubstitution:
419       return "LambdaExpressionSubstitution";
420     case CodeSynthesisContext::PriorTemplateArgumentSubstitution:
421       return "PriorTemplateArgumentSubstitution";
422     case CodeSynthesisContext::DefaultTemplateArgumentChecking:
423       return "DefaultTemplateArgumentChecking";
424     case CodeSynthesisContext::ExceptionSpecEvaluation:
425       return "ExceptionSpecEvaluation";
426     case CodeSynthesisContext::ExceptionSpecInstantiation:
427       return "ExceptionSpecInstantiation";
428     case CodeSynthesisContext::DeclaringSpecialMember:
429       return "DeclaringSpecialMember";
430     case CodeSynthesisContext::DeclaringImplicitEqualityComparison:
431       return "DeclaringImplicitEqualityComparison";
432     case CodeSynthesisContext::DefiningSynthesizedFunction:
433       return "DefiningSynthesizedFunction";
434     case CodeSynthesisContext::RewritingOperatorAsSpaceship:
435       return "RewritingOperatorAsSpaceship";
436     case CodeSynthesisContext::Memoization:
437       return "Memoization";
438     case CodeSynthesisContext::ConstraintsCheck:
439       return "ConstraintsCheck";
440     case CodeSynthesisContext::ConstraintSubstitution:
441       return "ConstraintSubstitution";
442     case CodeSynthesisContext::ConstraintNormalization:
443       return "ConstraintNormalization";
444     case CodeSynthesisContext::RequirementParameterInstantiation:
445       return "RequirementParameterInstantiation";
446     case CodeSynthesisContext::ParameterMappingSubstitution:
447       return "ParameterMappingSubstitution";
448     case CodeSynthesisContext::RequirementInstantiation:
449       return "RequirementInstantiation";
450     case CodeSynthesisContext::NestedRequirementConstraintsCheck:
451       return "NestedRequirementConstraintsCheck";
452     case CodeSynthesisContext::InitializingStructuredBinding:
453       return "InitializingStructuredBinding";
454     case CodeSynthesisContext::MarkingClassDllexported:
455       return "MarkingClassDllexported";
456     case CodeSynthesisContext::BuildingBuiltinDumpStructCall:
457       return "BuildingBuiltinDumpStructCall";
458     case CodeSynthesisContext::BuildingDeductionGuides:
459       return "BuildingDeductionGuides";
460     case CodeSynthesisContext::TypeAliasTemplateInstantiation:
461       return "TypeAliasTemplateInstantiation";
462     case CodeSynthesisContext::PartialOrderingTTP:
463       return "PartialOrderingTTP";
464     }
465     return "";
466   }
467 
468   template <bool BeginInstantiation>
469   static void displayTemplightEntry(llvm::raw_ostream &Out, const Sema &TheSema,
470                                     const CodeSynthesisContext &Inst) {
471     std::string YAML;
472     {
473       llvm::raw_string_ostream OS(YAML);
474       llvm::yaml::Output YO(OS);
475       TemplightEntry Entry =
476           getTemplightEntry<BeginInstantiation>(TheSema, Inst);
477       llvm::yaml::EmptyContext Context;
478       llvm::yaml::yamlize(YO, Entry, true, Context);
479     }
480     Out << "---" << YAML << "\n";
481   }
482 
483   static void printEntryName(const Sema &TheSema, const Decl *Entity,
484                              llvm::raw_string_ostream &OS) {
485     auto *NamedTemplate = cast<NamedDecl>(Entity);
486 
487     PrintingPolicy Policy = TheSema.Context.getPrintingPolicy();
488     // FIXME: Also ask for FullyQualifiedNames?
489     Policy.SuppressDefaultTemplateArgs = false;
490     NamedTemplate->getNameForDiagnostic(OS, Policy, true);
491 
492     if (!OS.str().empty())
493       return;
494 
495     Decl *Ctx = Decl::castFromDeclContext(NamedTemplate->getDeclContext());
496     NamedDecl *NamedCtx = dyn_cast_or_null<NamedDecl>(Ctx);
497 
498     if (const auto *Decl = dyn_cast<TagDecl>(NamedTemplate)) {
499       if (const auto *R = dyn_cast<RecordDecl>(Decl)) {
500         if (R->isLambda()) {
501           OS << "lambda at ";
502           Decl->getLocation().print(OS, TheSema.getSourceManager());
503           return;
504         }
505       }
506       OS << "unnamed " << Decl->getKindName();
507       return;
508     }
509 
510     assert(NamedCtx && "NamedCtx cannot be null");
511 
512     if (const auto *Decl = dyn_cast<ParmVarDecl>(NamedTemplate)) {
513       OS << "unnamed function parameter " << Decl->getFunctionScopeIndex()
514          << " ";
515       if (Decl->getFunctionScopeDepth() > 0)
516         OS << "(at depth " << Decl->getFunctionScopeDepth() << ") ";
517       OS << "of ";
518       NamedCtx->getNameForDiagnostic(OS, TheSema.getLangOpts(), true);
519       return;
520     }
521 
522     if (const auto *Decl = dyn_cast<TemplateTypeParmDecl>(NamedTemplate)) {
523       if (const Type *Ty = Decl->getTypeForDecl()) {
524         if (const auto *TTPT = dyn_cast_or_null<TemplateTypeParmType>(Ty)) {
525           OS << "unnamed template type parameter " << TTPT->getIndex() << " ";
526           if (TTPT->getDepth() > 0)
527             OS << "(at depth " << TTPT->getDepth() << ") ";
528           OS << "of ";
529           NamedCtx->getNameForDiagnostic(OS, TheSema.getLangOpts(), true);
530           return;
531         }
532       }
533     }
534 
535     if (const auto *Decl = dyn_cast<NonTypeTemplateParmDecl>(NamedTemplate)) {
536       OS << "unnamed template non-type parameter " << Decl->getIndex() << " ";
537       if (Decl->getDepth() > 0)
538         OS << "(at depth " << Decl->getDepth() << ") ";
539       OS << "of ";
540       NamedCtx->getNameForDiagnostic(OS, TheSema.getLangOpts(), true);
541       return;
542     }
543 
544     if (const auto *Decl = dyn_cast<TemplateTemplateParmDecl>(NamedTemplate)) {
545       OS << "unnamed template template parameter " << Decl->getIndex() << " ";
546       if (Decl->getDepth() > 0)
547         OS << "(at depth " << Decl->getDepth() << ") ";
548       OS << "of ";
549       NamedCtx->getNameForDiagnostic(OS, TheSema.getLangOpts(), true);
550       return;
551     }
552 
553     llvm_unreachable("Failed to retrieve a name for this entry!");
554     OS << "unnamed identifier";
555   }
556 
557   template <bool BeginInstantiation>
558   static TemplightEntry getTemplightEntry(const Sema &TheSema,
559                                           const CodeSynthesisContext &Inst) {
560     TemplightEntry Entry;
561     Entry.Kind = toString(Inst.Kind);
562     Entry.Event = BeginInstantiation ? "Begin" : "End";
563     llvm::raw_string_ostream OS(Entry.Name);
564     printEntryName(TheSema, Inst.Entity, OS);
565     const PresumedLoc DefLoc =
566         TheSema.getSourceManager().getPresumedLoc(Inst.Entity->getLocation());
567     if (!DefLoc.isInvalid())
568       Entry.DefinitionLocation = std::string(DefLoc.getFilename()) + ":" +
569                                  std::to_string(DefLoc.getLine()) + ":" +
570                                  std::to_string(DefLoc.getColumn());
571     const PresumedLoc PoiLoc =
572         TheSema.getSourceManager().getPresumedLoc(Inst.PointOfInstantiation);
573     if (!PoiLoc.isInvalid()) {
574       Entry.PointOfInstantiation = std::string(PoiLoc.getFilename()) + ":" +
575                                    std::to_string(PoiLoc.getLine()) + ":" +
576                                    std::to_string(PoiLoc.getColumn());
577     }
578     return Entry;
579   }
580 };
581 } // namespace
582 
583 std::unique_ptr<ASTConsumer>
584 TemplightDumpAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
585   return std::make_unique<ASTConsumer>();
586 }
587 
588 void TemplightDumpAction::ExecuteAction() {
589   CompilerInstance &CI = getCompilerInstance();
590 
591   // This part is normally done by ASTFrontEndAction, but needs to happen
592   // before Templight observers can be created
593   // FIXME: Move the truncation aspect of this into Sema, we delayed this till
594   // here so the source manager would be initialized.
595   EnsureSemaIsCreated(CI, *this);
596 
597   CI.getSema().TemplateInstCallbacks.push_back(
598       std::make_unique<DefaultTemplateInstCallback>());
599   ASTFrontendAction::ExecuteAction();
600 }
601 
602 namespace {
603   /// AST reader listener that dumps module information for a module
604   /// file.
605   class DumpModuleInfoListener : public ASTReaderListener {
606     llvm::raw_ostream &Out;
607 
608   public:
609     DumpModuleInfoListener(llvm::raw_ostream &Out) : Out(Out) { }
610 
611 #define DUMP_BOOLEAN(Value, Text)                       \
612     Out.indent(4) << Text << ": " << (Value? "Yes" : "No") << "\n"
613 
614     bool ReadFullVersionInformation(StringRef FullVersion) override {
615       Out.indent(2)
616         << "Generated by "
617         << (FullVersion == getClangFullRepositoryVersion()? "this"
618                                                           : "a different")
619         << " Clang: " << FullVersion << "\n";
620       return ASTReaderListener::ReadFullVersionInformation(FullVersion);
621     }
622 
623     void ReadModuleName(StringRef ModuleName) override {
624       Out.indent(2) << "Module name: " << ModuleName << "\n";
625     }
626     void ReadModuleMapFile(StringRef ModuleMapPath) override {
627       Out.indent(2) << "Module map file: " << ModuleMapPath << "\n";
628     }
629 
630     bool ReadLanguageOptions(const LangOptions &LangOpts,
631                              StringRef ModuleFilename, bool Complain,
632                              bool AllowCompatibleDifferences) override {
633       Out.indent(2) << "Language options:\n";
634 #define LANGOPT(Name, Bits, Default, Description) \
635       DUMP_BOOLEAN(LangOpts.Name, Description);
636 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
637       Out.indent(4) << Description << ": "                   \
638                     << static_cast<unsigned>(LangOpts.get##Name()) << "\n";
639 #define VALUE_LANGOPT(Name, Bits, Default, Description) \
640       Out.indent(4) << Description << ": " << LangOpts.Name << "\n";
641 #define BENIGN_LANGOPT(Name, Bits, Default, Description)
642 #define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
643 #include "clang/Basic/LangOptions.def"
644 
645       if (!LangOpts.ModuleFeatures.empty()) {
646         Out.indent(4) << "Module features:\n";
647         for (StringRef Feature : LangOpts.ModuleFeatures)
648           Out.indent(6) << Feature << "\n";
649       }
650 
651       return false;
652     }
653 
654     bool ReadTargetOptions(const TargetOptions &TargetOpts,
655                            StringRef ModuleFilename, bool Complain,
656                            bool AllowCompatibleDifferences) override {
657       Out.indent(2) << "Target options:\n";
658       Out.indent(4) << "  Triple: " << TargetOpts.Triple << "\n";
659       Out.indent(4) << "  CPU: " << TargetOpts.CPU << "\n";
660       Out.indent(4) << "  TuneCPU: " << TargetOpts.TuneCPU << "\n";
661       Out.indent(4) << "  ABI: " << TargetOpts.ABI << "\n";
662 
663       if (!TargetOpts.FeaturesAsWritten.empty()) {
664         Out.indent(4) << "Target features:\n";
665         for (unsigned I = 0, N = TargetOpts.FeaturesAsWritten.size();
666              I != N; ++I) {
667           Out.indent(6) << TargetOpts.FeaturesAsWritten[I] << "\n";
668         }
669       }
670 
671       return false;
672     }
673 
674     bool ReadDiagnosticOptions(IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts,
675                                StringRef ModuleFilename,
676                                bool Complain) override {
677       Out.indent(2) << "Diagnostic options:\n";
678 #define DIAGOPT(Name, Bits, Default) DUMP_BOOLEAN(DiagOpts->Name, #Name);
679 #define ENUM_DIAGOPT(Name, Type, Bits, Default) \
680       Out.indent(4) << #Name << ": " << DiagOpts->get##Name() << "\n";
681 #define VALUE_DIAGOPT(Name, Bits, Default) \
682       Out.indent(4) << #Name << ": " << DiagOpts->Name << "\n";
683 #include "clang/Basic/DiagnosticOptions.def"
684 
685       Out.indent(4) << "Diagnostic flags:\n";
686       for (const std::string &Warning : DiagOpts->Warnings)
687         Out.indent(6) << "-W" << Warning << "\n";
688       for (const std::string &Remark : DiagOpts->Remarks)
689         Out.indent(6) << "-R" << Remark << "\n";
690 
691       return false;
692     }
693 
694     bool ReadHeaderSearchOptions(const HeaderSearchOptions &HSOpts,
695                                  StringRef ModuleFilename,
696                                  StringRef SpecificModuleCachePath,
697                                  bool Complain) override {
698       Out.indent(2) << "Header search options:\n";
699       Out.indent(4) << "System root [-isysroot=]: '" << HSOpts.Sysroot << "'\n";
700       Out.indent(4) << "Resource dir [ -resource-dir=]: '" << HSOpts.ResourceDir << "'\n";
701       Out.indent(4) << "Module Cache: '" << SpecificModuleCachePath << "'\n";
702       DUMP_BOOLEAN(HSOpts.UseBuiltinIncludes,
703                    "Use builtin include directories [-nobuiltininc]");
704       DUMP_BOOLEAN(HSOpts.UseStandardSystemIncludes,
705                    "Use standard system include directories [-nostdinc]");
706       DUMP_BOOLEAN(HSOpts.UseStandardCXXIncludes,
707                    "Use standard C++ include directories [-nostdinc++]");
708       DUMP_BOOLEAN(HSOpts.UseLibcxx,
709                    "Use libc++ (rather than libstdc++) [-stdlib=]");
710       return false;
711     }
712 
713     bool ReadHeaderSearchPaths(const HeaderSearchOptions &HSOpts,
714                                bool Complain) override {
715       Out.indent(2) << "Header search paths:\n";
716       Out.indent(4) << "User entries:\n";
717       for (const auto &Entry : HSOpts.UserEntries)
718         Out.indent(6) << Entry.Path << "\n";
719       Out.indent(4) << "System header prefixes:\n";
720       for (const auto &Prefix : HSOpts.SystemHeaderPrefixes)
721         Out.indent(6) << Prefix.Prefix << "\n";
722       Out.indent(4) << "VFS overlay files:\n";
723       for (const auto &Overlay : HSOpts.VFSOverlayFiles)
724         Out.indent(6) << Overlay << "\n";
725       return false;
726     }
727 
728     bool ReadPreprocessorOptions(const PreprocessorOptions &PPOpts,
729                                  StringRef ModuleFilename, bool ReadMacros,
730                                  bool Complain,
731                                  std::string &SuggestedPredefines) override {
732       Out.indent(2) << "Preprocessor options:\n";
733       DUMP_BOOLEAN(PPOpts.UsePredefines,
734                    "Uses compiler/target-specific predefines [-undef]");
735       DUMP_BOOLEAN(PPOpts.DetailedRecord,
736                    "Uses detailed preprocessing record (for indexing)");
737 
738       if (ReadMacros) {
739         Out.indent(4) << "Predefined macros:\n";
740       }
741 
742       for (std::vector<std::pair<std::string, bool/*isUndef*/> >::const_iterator
743              I = PPOpts.Macros.begin(), IEnd = PPOpts.Macros.end();
744            I != IEnd; ++I) {
745         Out.indent(6);
746         if (I->second)
747           Out << "-U";
748         else
749           Out << "-D";
750         Out << I->first << "\n";
751       }
752       return false;
753     }
754 
755     /// Indicates that a particular module file extension has been read.
756     void readModuleFileExtension(
757            const ModuleFileExtensionMetadata &Metadata) override {
758       Out.indent(2) << "Module file extension '"
759                     << Metadata.BlockName << "' " << Metadata.MajorVersion
760                     << "." << Metadata.MinorVersion;
761       if (!Metadata.UserInfo.empty()) {
762         Out << ": ";
763         Out.write_escaped(Metadata.UserInfo);
764       }
765 
766       Out << "\n";
767     }
768 
769     /// Tells the \c ASTReaderListener that we want to receive the
770     /// input files of the AST file via \c visitInputFile.
771     bool needsInputFileVisitation() override { return true; }
772 
773     /// Tells the \c ASTReaderListener that we want to receive the
774     /// input files of the AST file via \c visitInputFile.
775     bool needsSystemInputFileVisitation() override { return true; }
776 
777     /// Indicates that the AST file contains particular input file.
778     ///
779     /// \returns true to continue receiving the next input file, false to stop.
780     bool visitInputFile(StringRef Filename, bool isSystem,
781                         bool isOverridden, bool isExplicitModule) override {
782 
783       Out.indent(2) << "Input file: " << Filename;
784 
785       if (isSystem || isOverridden || isExplicitModule) {
786         Out << " [";
787         if (isSystem) {
788           Out << "System";
789           if (isOverridden || isExplicitModule)
790             Out << ", ";
791         }
792         if (isOverridden) {
793           Out << "Overridden";
794           if (isExplicitModule)
795             Out << ", ";
796         }
797         if (isExplicitModule)
798           Out << "ExplicitModule";
799 
800         Out << "]";
801       }
802 
803       Out << "\n";
804 
805       return true;
806     }
807 
808     /// Returns true if this \c ASTReaderListener wants to receive the
809     /// imports of the AST file via \c visitImport, false otherwise.
810     bool needsImportVisitation() const override { return true; }
811 
812     /// If needsImportVisitation returns \c true, this is called for each
813     /// AST file imported by this AST file.
814     void visitImport(StringRef ModuleName, StringRef Filename) override {
815       Out.indent(2) << "Imports module '" << ModuleName
816                     << "': " << Filename.str() << "\n";
817     }
818 #undef DUMP_BOOLEAN
819   };
820 }
821 
822 bool DumpModuleInfoAction::BeginInvocation(CompilerInstance &CI) {
823   // The Object file reader also supports raw ast files and there is no point in
824   // being strict about the module file format in -module-file-info mode.
825   CI.getHeaderSearchOpts().ModuleFormat = "obj";
826   return true;
827 }
828 
829 static StringRef ModuleKindName(Module::ModuleKind MK) {
830   switch (MK) {
831   case Module::ModuleMapModule:
832     return "Module Map Module";
833   case Module::ModuleInterfaceUnit:
834     return "Interface Unit";
835   case Module::ModuleImplementationUnit:
836     return "Implementation Unit";
837   case Module::ModulePartitionInterface:
838     return "Partition Interface";
839   case Module::ModulePartitionImplementation:
840     return "Partition Implementation";
841   case Module::ModuleHeaderUnit:
842     return "Header Unit";
843   case Module::ExplicitGlobalModuleFragment:
844     return "Global Module Fragment";
845   case Module::ImplicitGlobalModuleFragment:
846     return "Implicit Module Fragment";
847   case Module::PrivateModuleFragment:
848     return "Private Module Fragment";
849   }
850   llvm_unreachable("unknown module kind!");
851 }
852 
853 void DumpModuleInfoAction::ExecuteAction() {
854   CompilerInstance &CI = getCompilerInstance();
855 
856   // Don't process files of type other than module to avoid crash
857   if (!isCurrentFileAST()) {
858     CI.getDiagnostics().Report(diag::err_file_is_not_module)
859         << getCurrentFile();
860     return;
861   }
862 
863   // Set up the output file.
864   StringRef OutputFileName = CI.getFrontendOpts().OutputFile;
865   if (!OutputFileName.empty() && OutputFileName != "-") {
866     std::error_code EC;
867     OutputStream.reset(new llvm::raw_fd_ostream(
868         OutputFileName.str(), EC, llvm::sys::fs::OF_TextWithCRLF));
869   }
870   llvm::raw_ostream &Out = OutputStream ? *OutputStream : llvm::outs();
871 
872   Out << "Information for module file '" << getCurrentFile() << "':\n";
873   auto &FileMgr = CI.getFileManager();
874   auto Buffer = FileMgr.getBufferForFile(getCurrentFile());
875   StringRef Magic = (*Buffer)->getMemBufferRef().getBuffer();
876   bool IsRaw = Magic.starts_with("CPCH");
877   Out << "  Module format: " << (IsRaw ? "raw" : "obj") << "\n";
878 
879   Preprocessor &PP = CI.getPreprocessor();
880   DumpModuleInfoListener Listener(Out);
881   HeaderSearchOptions &HSOpts = PP.getHeaderSearchInfo().getHeaderSearchOpts();
882 
883   // The FrontendAction::BeginSourceFile () method loads the AST so that much
884   // of the information is already available and modules should have been
885   // loaded.
886 
887   const LangOptions &LO = getCurrentASTUnit().getLangOpts();
888   if (LO.CPlusPlusModules && !LO.CurrentModule.empty()) {
889     ASTReader *R = getCurrentASTUnit().getASTReader().get();
890     unsigned SubModuleCount = R->getTotalNumSubmodules();
891     serialization::ModuleFile &MF = R->getModuleManager().getPrimaryModule();
892     Out << "  ====== C++20 Module structure ======\n";
893 
894     if (MF.ModuleName != LO.CurrentModule)
895       Out << "  Mismatched module names : " << MF.ModuleName << " and "
896           << LO.CurrentModule << "\n";
897 
898     struct SubModInfo {
899       unsigned Idx;
900       Module *Mod;
901       Module::ModuleKind Kind;
902       std::string &Name;
903       bool Seen;
904     };
905     std::map<std::string, SubModInfo> SubModMap;
906     auto PrintSubMapEntry = [&](std::string Name, Module::ModuleKind Kind) {
907       Out << "    " << ModuleKindName(Kind) << " '" << Name << "'";
908       auto I = SubModMap.find(Name);
909       if (I == SubModMap.end())
910         Out << " was not found in the sub modules!\n";
911       else {
912         I->second.Seen = true;
913         Out << " is at index #" << I->second.Idx << "\n";
914       }
915     };
916     Module *Primary = nullptr;
917     for (unsigned Idx = 0; Idx <= SubModuleCount; ++Idx) {
918       Module *M = R->getModule(Idx);
919       if (!M)
920         continue;
921       if (M->Name == LO.CurrentModule) {
922         Primary = M;
923         Out << "  " << ModuleKindName(M->Kind) << " '" << LO.CurrentModule
924             << "' is the Primary Module at index #" << Idx << "\n";
925         SubModMap.insert({M->Name, {Idx, M, M->Kind, M->Name, true}});
926       } else
927         SubModMap.insert({M->Name, {Idx, M, M->Kind, M->Name, false}});
928     }
929     if (Primary) {
930       if (!Primary->submodules().empty())
931         Out << "   Sub Modules:\n";
932       for (auto *MI : Primary->submodules()) {
933         PrintSubMapEntry(MI->Name, MI->Kind);
934       }
935       if (!Primary->Imports.empty())
936         Out << "   Imports:\n";
937       for (auto *IMP : Primary->Imports) {
938         PrintSubMapEntry(IMP->Name, IMP->Kind);
939       }
940       if (!Primary->Exports.empty())
941         Out << "   Exports:\n";
942       for (unsigned MN = 0, N = Primary->Exports.size(); MN != N; ++MN) {
943         if (Module *M = Primary->Exports[MN].getPointer()) {
944           PrintSubMapEntry(M->Name, M->Kind);
945         }
946       }
947     }
948 
949     // Emit the macro definitions in the module file so that we can know how
950     // much definitions in the module file quickly.
951     // TODO: Emit the macro definition bodies completely.
952     if (auto FilteredMacros = llvm::make_filter_range(
953             R->getPreprocessor().macros(),
954             [](const auto &Macro) { return Macro.first->isFromAST(); });
955         !FilteredMacros.empty()) {
956       Out << "   Macro Definitions:\n";
957       for (/*<IdentifierInfo *, MacroState> pair*/ const auto &Macro :
958            FilteredMacros)
959         Out << "     " << Macro.first->getName() << "\n";
960     }
961 
962     // Now let's print out any modules we did not see as part of the Primary.
963     for (const auto &SM : SubModMap) {
964       if (!SM.second.Seen && SM.second.Mod) {
965         Out << "  " << ModuleKindName(SM.second.Kind) << " '" << SM.first
966             << "' at index #" << SM.second.Idx
967             << " has no direct reference in the Primary\n";
968       }
969     }
970     Out << "  ====== ======\n";
971   }
972 
973   // The reminder of the output is produced from the listener as the AST
974   // FileCcontrolBlock is (re-)parsed.
975   ASTReader::readASTFileControlBlock(
976       getCurrentFile(), FileMgr, CI.getModuleCache(),
977       CI.getPCHContainerReader(),
978       /*FindModuleFileExtensions=*/true, Listener,
979       HSOpts.ModulesValidateDiagnosticOptions);
980 }
981 
982 //===----------------------------------------------------------------------===//
983 // Preprocessor Actions
984 //===----------------------------------------------------------------------===//
985 
986 void DumpRawTokensAction::ExecuteAction() {
987   Preprocessor &PP = getCompilerInstance().getPreprocessor();
988   SourceManager &SM = PP.getSourceManager();
989 
990   // Start lexing the specified input file.
991   llvm::MemoryBufferRef FromFile = SM.getBufferOrFake(SM.getMainFileID());
992   Lexer RawLex(SM.getMainFileID(), FromFile, SM, PP.getLangOpts());
993   RawLex.SetKeepWhitespaceMode(true);
994 
995   Token RawTok;
996   RawLex.LexFromRawLexer(RawTok);
997   while (RawTok.isNot(tok::eof)) {
998     PP.DumpToken(RawTok, true);
999     llvm::errs() << "\n";
1000     RawLex.LexFromRawLexer(RawTok);
1001   }
1002 }
1003 
1004 void DumpTokensAction::ExecuteAction() {
1005   Preprocessor &PP = getCompilerInstance().getPreprocessor();
1006   // Start preprocessing the specified input file.
1007   Token Tok;
1008   PP.EnterMainSourceFile();
1009   do {
1010     PP.Lex(Tok);
1011     PP.DumpToken(Tok, true);
1012     llvm::errs() << "\n";
1013   } while (Tok.isNot(tok::eof));
1014 }
1015 
1016 void PreprocessOnlyAction::ExecuteAction() {
1017   Preprocessor &PP = getCompilerInstance().getPreprocessor();
1018 
1019   // Ignore unknown pragmas.
1020   PP.IgnorePragmas();
1021 
1022   Token Tok;
1023   // Start parsing the specified input file.
1024   PP.EnterMainSourceFile();
1025   do {
1026     PP.Lex(Tok);
1027   } while (Tok.isNot(tok::eof));
1028 }
1029 
1030 void PrintPreprocessedAction::ExecuteAction() {
1031   CompilerInstance &CI = getCompilerInstance();
1032   // Output file may need to be set to 'Binary', to avoid converting Unix style
1033   // line feeds (<LF>) to Microsoft style line feeds (<CR><LF>) on Windows.
1034   //
1035   // Look to see what type of line endings the file uses. If there's a
1036   // CRLF, then we won't open the file up in binary mode. If there is
1037   // just an LF or CR, then we will open the file up in binary mode.
1038   // In this fashion, the output format should match the input format, unless
1039   // the input format has inconsistent line endings.
1040   //
1041   // This should be a relatively fast operation since most files won't have
1042   // all of their source code on a single line. However, that is still a
1043   // concern, so if we scan for too long, we'll just assume the file should
1044   // be opened in binary mode.
1045 
1046   bool BinaryMode = false;
1047   if (llvm::Triple(LLVM_HOST_TRIPLE).isOSWindows()) {
1048     BinaryMode = true;
1049     const SourceManager &SM = CI.getSourceManager();
1050     if (std::optional<llvm::MemoryBufferRef> Buffer =
1051             SM.getBufferOrNone(SM.getMainFileID())) {
1052       const char *cur = Buffer->getBufferStart();
1053       const char *end = Buffer->getBufferEnd();
1054       const char *next = (cur != end) ? cur + 1 : end;
1055 
1056       // Limit ourselves to only scanning 256 characters into the source
1057       // file.  This is mostly a check in case the file has no
1058       // newlines whatsoever.
1059       if (end - cur > 256)
1060         end = cur + 256;
1061 
1062       while (next < end) {
1063         if (*cur == 0x0D) {  // CR
1064           if (*next == 0x0A) // CRLF
1065             BinaryMode = false;
1066 
1067           break;
1068         } else if (*cur == 0x0A) // LF
1069           break;
1070 
1071         ++cur;
1072         ++next;
1073       }
1074     }
1075   }
1076 
1077   std::unique_ptr<raw_ostream> OS =
1078       CI.createDefaultOutputFile(BinaryMode, getCurrentFileOrBufferName());
1079   if (!OS) return;
1080 
1081   // If we're preprocessing a module map, start by dumping the contents of the
1082   // module itself before switching to the input buffer.
1083   auto &Input = getCurrentInput();
1084   if (Input.getKind().getFormat() == InputKind::ModuleMap) {
1085     if (Input.isFile()) {
1086       (*OS) << "# 1 \"";
1087       OS->write_escaped(Input.getFile());
1088       (*OS) << "\"\n";
1089     }
1090     getCurrentModule()->print(*OS);
1091     (*OS) << "#pragma clang module contents\n";
1092   }
1093 
1094   DoPrintPreprocessedInput(CI.getPreprocessor(), OS.get(),
1095                            CI.getPreprocessorOutputOpts());
1096 }
1097 
1098 void PrintPreambleAction::ExecuteAction() {
1099   switch (getCurrentFileKind().getLanguage()) {
1100   case Language::C:
1101   case Language::CXX:
1102   case Language::ObjC:
1103   case Language::ObjCXX:
1104   case Language::OpenCL:
1105   case Language::OpenCLCXX:
1106   case Language::CUDA:
1107   case Language::HIP:
1108   case Language::HLSL:
1109   case Language::CIR:
1110     break;
1111 
1112   case Language::Unknown:
1113   case Language::Asm:
1114   case Language::LLVM_IR:
1115     // We can't do anything with these.
1116     return;
1117   }
1118 
1119   // We don't expect to find any #include directives in a preprocessed input.
1120   if (getCurrentFileKind().isPreprocessed())
1121     return;
1122 
1123   CompilerInstance &CI = getCompilerInstance();
1124   auto Buffer = CI.getFileManager().getBufferForFile(getCurrentFile());
1125   if (Buffer) {
1126     unsigned Preamble =
1127         Lexer::ComputePreamble((*Buffer)->getBuffer(), CI.getLangOpts()).Size;
1128     llvm::outs().write((*Buffer)->getBufferStart(), Preamble);
1129   }
1130 }
1131 
1132 void DumpCompilerOptionsAction::ExecuteAction() {
1133   CompilerInstance &CI = getCompilerInstance();
1134   std::unique_ptr<raw_ostream> OSP =
1135       CI.createDefaultOutputFile(false, getCurrentFile());
1136   if (!OSP)
1137     return;
1138 
1139   raw_ostream &OS = *OSP;
1140   const Preprocessor &PP = CI.getPreprocessor();
1141   const LangOptions &LangOpts = PP.getLangOpts();
1142 
1143   // FIXME: Rather than manually format the JSON (which is awkward due to
1144   // needing to remove trailing commas), this should make use of a JSON library.
1145   // FIXME: Instead of printing enums as an integral value and specifying the
1146   // type as a separate field, use introspection to print the enumerator.
1147 
1148   OS << "{\n";
1149   OS << "\n\"features\" : [\n";
1150   {
1151     llvm::SmallString<128> Str;
1152 #define FEATURE(Name, Predicate)                                               \
1153   ("\t{\"" #Name "\" : " + llvm::Twine(Predicate ? "true" : "false") + "},\n") \
1154       .toVector(Str);
1155 #include "clang/Basic/Features.def"
1156 #undef FEATURE
1157     // Remove the newline and comma from the last entry to ensure this remains
1158     // valid JSON.
1159     OS << Str.substr(0, Str.size() - 2);
1160   }
1161   OS << "\n],\n";
1162 
1163   OS << "\n\"extensions\" : [\n";
1164   {
1165     llvm::SmallString<128> Str;
1166 #define EXTENSION(Name, Predicate)                                             \
1167   ("\t{\"" #Name "\" : " + llvm::Twine(Predicate ? "true" : "false") + "},\n") \
1168       .toVector(Str);
1169 #include "clang/Basic/Features.def"
1170 #undef EXTENSION
1171     // Remove the newline and comma from the last entry to ensure this remains
1172     // valid JSON.
1173     OS << Str.substr(0, Str.size() - 2);
1174   }
1175   OS << "\n]\n";
1176 
1177   OS << "}";
1178 }
1179 
1180 void PrintDependencyDirectivesSourceMinimizerAction::ExecuteAction() {
1181   CompilerInstance &CI = getCompilerInstance();
1182   SourceManager &SM = CI.getPreprocessor().getSourceManager();
1183   llvm::MemoryBufferRef FromFile = SM.getBufferOrFake(SM.getMainFileID());
1184 
1185   llvm::SmallVector<dependency_directives_scan::Token, 16> Tokens;
1186   llvm::SmallVector<dependency_directives_scan::Directive, 32> Directives;
1187   if (scanSourceForDependencyDirectives(
1188           FromFile.getBuffer(), Tokens, Directives, &CI.getDiagnostics(),
1189           SM.getLocForStartOfFile(SM.getMainFileID()))) {
1190     assert(CI.getDiagnostics().hasErrorOccurred() &&
1191            "no errors reported for failure");
1192 
1193     // Preprocess the source when verifying the diagnostics to capture the
1194     // 'expected' comments.
1195     if (CI.getDiagnosticOpts().VerifyDiagnostics) {
1196       // Make sure we don't emit new diagnostics!
1197       CI.getDiagnostics().setSuppressAllDiagnostics(true);
1198       Preprocessor &PP = getCompilerInstance().getPreprocessor();
1199       PP.EnterMainSourceFile();
1200       Token Tok;
1201       do {
1202         PP.Lex(Tok);
1203       } while (Tok.isNot(tok::eof));
1204     }
1205     return;
1206   }
1207   printDependencyDirectivesAsSource(FromFile.getBuffer(), Directives,
1208                                     llvm::outs());
1209 }
1210 
1211 void GetDependenciesByModuleNameAction::ExecuteAction() {
1212   CompilerInstance &CI = getCompilerInstance();
1213   Preprocessor &PP = CI.getPreprocessor();
1214   SourceManager &SM = PP.getSourceManager();
1215   FileID MainFileID = SM.getMainFileID();
1216   SourceLocation FileStart = SM.getLocForStartOfFile(MainFileID);
1217   SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> Path;
1218   IdentifierInfo *ModuleID = PP.getIdentifierInfo(ModuleName);
1219   Path.push_back(std::make_pair(ModuleID, FileStart));
1220   auto ModResult = CI.loadModule(FileStart, Path, Module::Hidden, false);
1221   PPCallbacks *CB = PP.getPPCallbacks();
1222   CB->moduleImport(SourceLocation(), Path, ModResult);
1223 }
1224