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/DependencyDirectivesSourceMinimizer.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/Support/ErrorHandling.h"
30 #include "llvm/Support/FileSystem.h"
31 #include "llvm/Support/MemoryBuffer.h"
32 #include "llvm/Support/Path.h"
33 #include "llvm/Support/YAMLTraits.h"
34 #include "llvm/Support/raw_ostream.h"
35 #include <memory>
36 #include <system_error>
37 
38 using namespace clang;
39 
40 namespace {
41 CodeCompleteConsumer *GetCodeCompletionConsumer(CompilerInstance &CI) {
42   return CI.hasCodeCompletionConsumer() ? &CI.getCodeCompletionConsumer()
43                                         : nullptr;
44 }
45 
46 void EnsureSemaIsCreated(CompilerInstance &CI, FrontendAction &Action) {
47   if (Action.hasCodeCompletionSupport() &&
48       !CI.getFrontendOpts().CodeCompletionAt.FileName.empty())
49     CI.createCodeCompletionConsumer();
50 
51   if (!CI.hasSema())
52     CI.createSema(Action.getTranslationUnitKind(),
53                   GetCodeCompletionConsumer(CI));
54 }
55 } // namespace
56 
57 //===----------------------------------------------------------------------===//
58 // Custom Actions
59 //===----------------------------------------------------------------------===//
60 
61 std::unique_ptr<ASTConsumer>
62 InitOnlyAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
63   return std::make_unique<ASTConsumer>();
64 }
65 
66 void InitOnlyAction::ExecuteAction() {
67 }
68 
69 // Basically PreprocessOnlyAction::ExecuteAction.
70 void ReadPCHAndPreprocessAction::ExecuteAction() {
71   Preprocessor &PP = getCompilerInstance().getPreprocessor();
72 
73   // Ignore unknown pragmas.
74   PP.IgnorePragmas();
75 
76   Token Tok;
77   // Start parsing the specified input file.
78   PP.EnterMainSourceFile();
79   do {
80     PP.Lex(Tok);
81   } while (Tok.isNot(tok::eof));
82 }
83 
84 std::unique_ptr<ASTConsumer>
85 ReadPCHAndPreprocessAction::CreateASTConsumer(CompilerInstance &CI,
86                                               StringRef InFile) {
87   return std::make_unique<ASTConsumer>();
88 }
89 
90 //===----------------------------------------------------------------------===//
91 // AST Consumer Actions
92 //===----------------------------------------------------------------------===//
93 
94 std::unique_ptr<ASTConsumer>
95 ASTPrintAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
96   if (std::unique_ptr<raw_ostream> OS =
97           CI.createDefaultOutputFile(false, InFile))
98     return CreateASTPrinter(std::move(OS), CI.getFrontendOpts().ASTDumpFilter);
99   return nullptr;
100 }
101 
102 std::unique_ptr<ASTConsumer>
103 ASTDumpAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
104   const FrontendOptions &Opts = CI.getFrontendOpts();
105   return CreateASTDumper(nullptr /*Dump to stdout.*/, Opts.ASTDumpFilter,
106                          Opts.ASTDumpDecls, Opts.ASTDumpAll,
107                          Opts.ASTDumpLookups, Opts.ASTDumpDeclTypes,
108                          Opts.ASTDumpFormat);
109 }
110 
111 std::unique_ptr<ASTConsumer>
112 ASTDeclListAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
113   return CreateASTDeclNodeLister();
114 }
115 
116 std::unique_ptr<ASTConsumer>
117 ASTViewAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
118   return CreateASTViewer();
119 }
120 
121 std::unique_ptr<ASTConsumer>
122 GeneratePCHAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
123   std::string Sysroot;
124   if (!ComputeASTConsumerArguments(CI, /*ref*/ Sysroot))
125     return nullptr;
126 
127   std::string OutputFile;
128   std::unique_ptr<raw_pwrite_stream> OS =
129       CreateOutputFile(CI, InFile, /*ref*/ OutputFile);
130   if (!OS)
131     return nullptr;
132 
133   if (!CI.getFrontendOpts().RelocatablePCH)
134     Sysroot.clear();
135 
136   const auto &FrontendOpts = CI.getFrontendOpts();
137   auto Buffer = std::make_shared<PCHBuffer>();
138   std::vector<std::unique_ptr<ASTConsumer>> Consumers;
139   Consumers.push_back(std::make_unique<PCHGenerator>(
140       CI.getPreprocessor(), CI.getModuleCache(), OutputFile, Sysroot, Buffer,
141       FrontendOpts.ModuleFileExtensions,
142       CI.getPreprocessorOpts().AllowPCHWithCompilerErrors,
143       FrontendOpts.IncludeTimestamps, +CI.getLangOpts().CacheGeneratedPCH));
144   Consumers.push_back(CI.getPCHContainerWriter().CreatePCHContainerGenerator(
145       CI, std::string(InFile), OutputFile, std::move(OS), Buffer));
146 
147   return std::make_unique<MultiplexConsumer>(std::move(Consumers));
148 }
149 
150 bool GeneratePCHAction::ComputeASTConsumerArguments(CompilerInstance &CI,
151                                                     std::string &Sysroot) {
152   Sysroot = CI.getHeaderSearchOpts().Sysroot;
153   if (CI.getFrontendOpts().RelocatablePCH && Sysroot.empty()) {
154     CI.getDiagnostics().Report(diag::err_relocatable_without_isysroot);
155     return false;
156   }
157 
158   return true;
159 }
160 
161 std::unique_ptr<llvm::raw_pwrite_stream>
162 GeneratePCHAction::CreateOutputFile(CompilerInstance &CI, StringRef InFile,
163                                     std::string &OutputFile) {
164   // Because this is exposed via libclang we must disable RemoveFileOnSignal.
165   std::unique_ptr<raw_pwrite_stream> OS = CI.createDefaultOutputFile(
166       /*Binary=*/true, InFile, /*Extension=*/"", /*RemoveFileOnSignal=*/false);
167   if (!OS)
168     return nullptr;
169 
170   OutputFile = CI.getFrontendOpts().OutputFile;
171   return OS;
172 }
173 
174 bool GeneratePCHAction::shouldEraseOutputFiles() {
175   if (getCompilerInstance().getPreprocessorOpts().AllowPCHWithCompilerErrors)
176     return false;
177   return ASTFrontendAction::shouldEraseOutputFiles();
178 }
179 
180 bool GeneratePCHAction::BeginSourceFileAction(CompilerInstance &CI) {
181   CI.getLangOpts().CompilingPCH = true;
182   return true;
183 }
184 
185 std::unique_ptr<ASTConsumer>
186 GenerateModuleAction::CreateASTConsumer(CompilerInstance &CI,
187                                         StringRef InFile) {
188   std::unique_ptr<raw_pwrite_stream> OS = CreateOutputFile(CI, InFile);
189   if (!OS)
190     return nullptr;
191 
192   std::string OutputFile = CI.getFrontendOpts().OutputFile;
193   std::string Sysroot;
194 
195   auto Buffer = std::make_shared<PCHBuffer>();
196   std::vector<std::unique_ptr<ASTConsumer>> Consumers;
197 
198   Consumers.push_back(std::make_unique<PCHGenerator>(
199       CI.getPreprocessor(), CI.getModuleCache(), OutputFile, Sysroot, Buffer,
200       CI.getFrontendOpts().ModuleFileExtensions,
201       /*AllowASTWithErrors=*/
202       +CI.getFrontendOpts().AllowPCMWithCompilerErrors,
203       /*IncludeTimestamps=*/
204       +CI.getFrontendOpts().BuildingImplicitModule,
205       /*ShouldCacheASTInMemory=*/
206       +CI.getFrontendOpts().BuildingImplicitModule));
207   Consumers.push_back(CI.getPCHContainerWriter().CreatePCHContainerGenerator(
208       CI, std::string(InFile), OutputFile, std::move(OS), Buffer));
209   return std::make_unique<MultiplexConsumer>(std::move(Consumers));
210 }
211 
212 bool GenerateModuleAction::shouldEraseOutputFiles() {
213   return !getCompilerInstance().getFrontendOpts().AllowPCMWithCompilerErrors &&
214          ASTFrontendAction::shouldEraseOutputFiles();
215 }
216 
217 bool GenerateModuleFromModuleMapAction::BeginSourceFileAction(
218     CompilerInstance &CI) {
219   if (!CI.getLangOpts().Modules) {
220     CI.getDiagnostics().Report(diag::err_module_build_requires_fmodules);
221     return false;
222   }
223 
224   return GenerateModuleAction::BeginSourceFileAction(CI);
225 }
226 
227 std::unique_ptr<raw_pwrite_stream>
228 GenerateModuleFromModuleMapAction::CreateOutputFile(CompilerInstance &CI,
229                                                     StringRef InFile) {
230   // If no output file was provided, figure out where this module would go
231   // in the module cache.
232   if (CI.getFrontendOpts().OutputFile.empty()) {
233     StringRef ModuleMapFile = CI.getFrontendOpts().OriginalModuleMap;
234     if (ModuleMapFile.empty())
235       ModuleMapFile = InFile;
236 
237     HeaderSearch &HS = CI.getPreprocessor().getHeaderSearchInfo();
238     CI.getFrontendOpts().OutputFile =
239         HS.getCachedModuleFileName(CI.getLangOpts().CurrentModule,
240                                    ModuleMapFile);
241   }
242 
243   // Because this is exposed via libclang we must disable RemoveFileOnSignal.
244   return CI.createDefaultOutputFile(/*Binary=*/true, InFile, /*Extension=*/"",
245                                     /*RemoveFileOnSignal=*/false,
246                                     /*CreateMissingDirectories=*/true,
247                                     /*ForceUseTemporary=*/true);
248 }
249 
250 bool GenerateModuleInterfaceAction::BeginSourceFileAction(
251     CompilerInstance &CI) {
252   if (!CI.getLangOpts().ModulesTS && !CI.getLangOpts().CPlusPlusModules) {
253     CI.getDiagnostics().Report(diag::err_module_interface_requires_cpp_modules);
254     return false;
255   }
256 
257   CI.getLangOpts().setCompilingModule(LangOptions::CMK_ModuleInterface);
258 
259   return GenerateModuleAction::BeginSourceFileAction(CI);
260 }
261 
262 std::unique_ptr<raw_pwrite_stream>
263 GenerateModuleInterfaceAction::CreateOutputFile(CompilerInstance &CI,
264                                                 StringRef InFile) {
265   return CI.createDefaultOutputFile(/*Binary=*/true, InFile, "pcm");
266 }
267 
268 bool GenerateHeaderModuleAction::PrepareToExecuteAction(
269     CompilerInstance &CI) {
270   if (!CI.getLangOpts().Modules) {
271     CI.getDiagnostics().Report(diag::err_header_module_requires_modules);
272     return false;
273   }
274 
275   auto &Inputs = CI.getFrontendOpts().Inputs;
276   if (Inputs.empty())
277     return GenerateModuleAction::BeginInvocation(CI);
278 
279   auto Kind = Inputs[0].getKind();
280 
281   // Convert the header file inputs into a single module input buffer.
282   SmallString<256> HeaderContents;
283   ModuleHeaders.reserve(Inputs.size());
284   for (const FrontendInputFile &FIF : Inputs) {
285     // FIXME: We should support re-compiling from an AST file.
286     if (FIF.getKind().getFormat() != InputKind::Source || !FIF.isFile()) {
287       CI.getDiagnostics().Report(diag::err_module_header_file_not_found)
288           << (FIF.isFile() ? FIF.getFile()
289                            : FIF.getBuffer().getBufferIdentifier());
290       return true;
291     }
292 
293     HeaderContents += "#include \"";
294     HeaderContents += FIF.getFile();
295     HeaderContents += "\"\n";
296     ModuleHeaders.push_back(std::string(FIF.getFile()));
297   }
298   Buffer = llvm::MemoryBuffer::getMemBufferCopy(
299       HeaderContents, Module::getModuleInputBufferName());
300 
301   // Set that buffer up as our "real" input.
302   Inputs.clear();
303   Inputs.push_back(
304       FrontendInputFile(Buffer->getMemBufferRef(), Kind, /*IsSystem*/ false));
305 
306   return GenerateModuleAction::PrepareToExecuteAction(CI);
307 }
308 
309 bool GenerateHeaderModuleAction::BeginSourceFileAction(
310     CompilerInstance &CI) {
311   CI.getLangOpts().setCompilingModule(LangOptions::CMK_HeaderModule);
312 
313   // Synthesize a Module object for the given headers.
314   auto &HS = CI.getPreprocessor().getHeaderSearchInfo();
315   SmallVector<Module::Header, 16> Headers;
316   for (StringRef Name : ModuleHeaders) {
317     Optional<FileEntryRef> FE = HS.LookupFile(
318         Name, SourceLocation(), /*Angled*/ false, nullptr, nullptr, None,
319         nullptr, nullptr, nullptr, nullptr, nullptr, nullptr);
320     if (!FE) {
321       CI.getDiagnostics().Report(diag::err_module_header_file_not_found)
322         << Name;
323       continue;
324     }
325     Headers.push_back(
326         {std::string(Name), std::string(Name), &FE->getFileEntry()});
327   }
328   HS.getModuleMap().createHeaderModule(CI.getLangOpts().CurrentModule, Headers);
329 
330   return GenerateModuleAction::BeginSourceFileAction(CI);
331 }
332 
333 std::unique_ptr<raw_pwrite_stream>
334 GenerateHeaderModuleAction::CreateOutputFile(CompilerInstance &CI,
335                                              StringRef InFile) {
336   return CI.createDefaultOutputFile(/*Binary=*/true, InFile, "pcm");
337 }
338 
339 SyntaxOnlyAction::~SyntaxOnlyAction() {
340 }
341 
342 std::unique_ptr<ASTConsumer>
343 SyntaxOnlyAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
344   return std::make_unique<ASTConsumer>();
345 }
346 
347 std::unique_ptr<ASTConsumer>
348 DumpModuleInfoAction::CreateASTConsumer(CompilerInstance &CI,
349                                         StringRef InFile) {
350   return std::make_unique<ASTConsumer>();
351 }
352 
353 std::unique_ptr<ASTConsumer>
354 VerifyPCHAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
355   return std::make_unique<ASTConsumer>();
356 }
357 
358 void VerifyPCHAction::ExecuteAction() {
359   CompilerInstance &CI = getCompilerInstance();
360   bool Preamble = CI.getPreprocessorOpts().PrecompiledPreambleBytes.first != 0;
361   const std::string &Sysroot = CI.getHeaderSearchOpts().Sysroot;
362   std::unique_ptr<ASTReader> Reader(new ASTReader(
363       CI.getPreprocessor(), CI.getModuleCache(), &CI.getASTContext(),
364       CI.getPCHContainerReader(), CI.getFrontendOpts().ModuleFileExtensions,
365       Sysroot.empty() ? "" : Sysroot.c_str(),
366       DisableValidationForModuleKind::None,
367       /*AllowASTWithCompilerErrors*/ false,
368       /*AllowConfigurationMismatch*/ true,
369       /*ValidateSystemInputs*/ true));
370 
371   Reader->ReadAST(getCurrentFile(),
372                   Preamble ? serialization::MK_Preamble
373                            : serialization::MK_PCH,
374                   SourceLocation(),
375                   ASTReader::ARR_ConfigurationMismatch);
376 }
377 
378 namespace {
379 struct TemplightEntry {
380   std::string Name;
381   std::string Kind;
382   std::string Event;
383   std::string DefinitionLocation;
384   std::string PointOfInstantiation;
385 };
386 } // namespace
387 
388 namespace llvm {
389 namespace yaml {
390 template <> struct MappingTraits<TemplightEntry> {
391   static void mapping(IO &io, TemplightEntry &fields) {
392     io.mapRequired("name", fields.Name);
393     io.mapRequired("kind", fields.Kind);
394     io.mapRequired("event", fields.Event);
395     io.mapRequired("orig", fields.DefinitionLocation);
396     io.mapRequired("poi", fields.PointOfInstantiation);
397   }
398 };
399 } // namespace yaml
400 } // namespace llvm
401 
402 namespace {
403 class DefaultTemplateInstCallback : public TemplateInstantiationCallback {
404   using CodeSynthesisContext = Sema::CodeSynthesisContext;
405 
406 public:
407   void initialize(const Sema &) override {}
408 
409   void finalize(const Sema &) override {}
410 
411   void atTemplateBegin(const Sema &TheSema,
412                        const CodeSynthesisContext &Inst) override {
413     displayTemplightEntry<true>(llvm::outs(), TheSema, Inst);
414   }
415 
416   void atTemplateEnd(const Sema &TheSema,
417                      const CodeSynthesisContext &Inst) override {
418     displayTemplightEntry<false>(llvm::outs(), TheSema, Inst);
419   }
420 
421 private:
422   static std::string toString(CodeSynthesisContext::SynthesisKind Kind) {
423     switch (Kind) {
424     case CodeSynthesisContext::TemplateInstantiation:
425       return "TemplateInstantiation";
426     case CodeSynthesisContext::DefaultTemplateArgumentInstantiation:
427       return "DefaultTemplateArgumentInstantiation";
428     case CodeSynthesisContext::DefaultFunctionArgumentInstantiation:
429       return "DefaultFunctionArgumentInstantiation";
430     case CodeSynthesisContext::ExplicitTemplateArgumentSubstitution:
431       return "ExplicitTemplateArgumentSubstitution";
432     case CodeSynthesisContext::DeducedTemplateArgumentSubstitution:
433       return "DeducedTemplateArgumentSubstitution";
434     case CodeSynthesisContext::PriorTemplateArgumentSubstitution:
435       return "PriorTemplateArgumentSubstitution";
436     case CodeSynthesisContext::DefaultTemplateArgumentChecking:
437       return "DefaultTemplateArgumentChecking";
438     case CodeSynthesisContext::ExceptionSpecEvaluation:
439       return "ExceptionSpecEvaluation";
440     case CodeSynthesisContext::ExceptionSpecInstantiation:
441       return "ExceptionSpecInstantiation";
442     case CodeSynthesisContext::DeclaringSpecialMember:
443       return "DeclaringSpecialMember";
444     case CodeSynthesisContext::DeclaringImplicitEqualityComparison:
445       return "DeclaringImplicitEqualityComparison";
446     case CodeSynthesisContext::DefiningSynthesizedFunction:
447       return "DefiningSynthesizedFunction";
448     case CodeSynthesisContext::RewritingOperatorAsSpaceship:
449       return "RewritingOperatorAsSpaceship";
450     case CodeSynthesisContext::Memoization:
451       return "Memoization";
452     case CodeSynthesisContext::ConstraintsCheck:
453       return "ConstraintsCheck";
454     case CodeSynthesisContext::ConstraintSubstitution:
455       return "ConstraintSubstitution";
456     case CodeSynthesisContext::ConstraintNormalization:
457       return "ConstraintNormalization";
458     case CodeSynthesisContext::ParameterMappingSubstitution:
459       return "ParameterMappingSubstitution";
460     case CodeSynthesisContext::RequirementInstantiation:
461       return "RequirementInstantiation";
462     case CodeSynthesisContext::NestedRequirementConstraintsCheck:
463       return "NestedRequirementConstraintsCheck";
464     case CodeSynthesisContext::InitializingStructuredBinding:
465       return "InitializingStructuredBinding";
466     case CodeSynthesisContext::MarkingClassDllexported:
467       return "MarkingClassDllexported";
468     }
469     return "";
470   }
471 
472   template <bool BeginInstantiation>
473   static void displayTemplightEntry(llvm::raw_ostream &Out, const Sema &TheSema,
474                                     const CodeSynthesisContext &Inst) {
475     std::string YAML;
476     {
477       llvm::raw_string_ostream OS(YAML);
478       llvm::yaml::Output YO(OS);
479       TemplightEntry Entry =
480           getTemplightEntry<BeginInstantiation>(TheSema, Inst);
481       llvm::yaml::EmptyContext Context;
482       llvm::yaml::yamlize(YO, Entry, true, Context);
483     }
484     Out << "---" << YAML << "\n";
485   }
486 
487   static void printEntryName(const Sema &TheSema, const Decl *Entity,
488                              llvm::raw_string_ostream &OS) {
489     auto *NamedTemplate = cast<NamedDecl>(Entity);
490 
491     PrintingPolicy Policy = TheSema.Context.getPrintingPolicy();
492     // FIXME: Also ask for FullyQualifiedNames?
493     Policy.SuppressDefaultTemplateArgs = false;
494     NamedTemplate->getNameForDiagnostic(OS, Policy, true);
495 
496     if (!OS.str().empty())
497       return;
498 
499     Decl *Ctx = Decl::castFromDeclContext(NamedTemplate->getDeclContext());
500     NamedDecl *NamedCtx = dyn_cast_or_null<NamedDecl>(Ctx);
501 
502     if (const auto *Decl = dyn_cast<TagDecl>(NamedTemplate)) {
503       if (const auto *R = dyn_cast<RecordDecl>(Decl)) {
504         if (R->isLambda()) {
505           OS << "lambda at ";
506           Decl->getLocation().print(OS, TheSema.getSourceManager());
507           return;
508         }
509       }
510       OS << "unnamed " << Decl->getKindName();
511       return;
512     }
513 
514     if (const auto *Decl = dyn_cast<ParmVarDecl>(NamedTemplate)) {
515       OS << "unnamed function parameter " << Decl->getFunctionScopeIndex()
516          << " ";
517       if (Decl->getFunctionScopeDepth() > 0)
518         OS << "(at depth " << Decl->getFunctionScopeDepth() << ") ";
519       OS << "of ";
520       NamedCtx->getNameForDiagnostic(OS, TheSema.getLangOpts(), true);
521       return;
522     }
523 
524     if (const auto *Decl = dyn_cast<TemplateTypeParmDecl>(NamedTemplate)) {
525       if (const Type *Ty = Decl->getTypeForDecl()) {
526         if (const auto *TTPT = dyn_cast_or_null<TemplateTypeParmType>(Ty)) {
527           OS << "unnamed template type parameter " << TTPT->getIndex() << " ";
528           if (TTPT->getDepth() > 0)
529             OS << "(at depth " << TTPT->getDepth() << ") ";
530           OS << "of ";
531           NamedCtx->getNameForDiagnostic(OS, TheSema.getLangOpts(), true);
532           return;
533         }
534       }
535     }
536 
537     if (const auto *Decl = dyn_cast<NonTypeTemplateParmDecl>(NamedTemplate)) {
538       OS << "unnamed template non-type parameter " << Decl->getIndex() << " ";
539       if (Decl->getDepth() > 0)
540         OS << "(at depth " << Decl->getDepth() << ") ";
541       OS << "of ";
542       NamedCtx->getNameForDiagnostic(OS, TheSema.getLangOpts(), true);
543       return;
544     }
545 
546     if (const auto *Decl = dyn_cast<TemplateTemplateParmDecl>(NamedTemplate)) {
547       OS << "unnamed template template parameter " << Decl->getIndex() << " ";
548       if (Decl->getDepth() > 0)
549         OS << "(at depth " << Decl->getDepth() << ") ";
550       OS << "of ";
551       NamedCtx->getNameForDiagnostic(OS, TheSema.getLangOpts(), true);
552       return;
553     }
554 
555     llvm_unreachable("Failed to retrieve a name for this entry!");
556     OS << "unnamed identifier";
557   }
558 
559   template <bool BeginInstantiation>
560   static TemplightEntry getTemplightEntry(const Sema &TheSema,
561                                           const CodeSynthesisContext &Inst) {
562     TemplightEntry Entry;
563     Entry.Kind = toString(Inst.Kind);
564     Entry.Event = BeginInstantiation ? "Begin" : "End";
565     llvm::raw_string_ostream OS(Entry.Name);
566     printEntryName(TheSema, Inst.Entity, OS);
567     const PresumedLoc DefLoc =
568         TheSema.getSourceManager().getPresumedLoc(Inst.Entity->getLocation());
569     if (!DefLoc.isInvalid())
570       Entry.DefinitionLocation = std::string(DefLoc.getFilename()) + ":" +
571                                  std::to_string(DefLoc.getLine()) + ":" +
572                                  std::to_string(DefLoc.getColumn());
573     const PresumedLoc PoiLoc =
574         TheSema.getSourceManager().getPresumedLoc(Inst.PointOfInstantiation);
575     if (!PoiLoc.isInvalid()) {
576       Entry.PointOfInstantiation = std::string(PoiLoc.getFilename()) + ":" +
577                                    std::to_string(PoiLoc.getLine()) + ":" +
578                                    std::to_string(PoiLoc.getColumn());
579     }
580     return Entry;
581   }
582 };
583 } // namespace
584 
585 std::unique_ptr<ASTConsumer>
586 TemplightDumpAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
587   return std::make_unique<ASTConsumer>();
588 }
589 
590 void TemplightDumpAction::ExecuteAction() {
591   CompilerInstance &CI = getCompilerInstance();
592 
593   // This part is normally done by ASTFrontEndAction, but needs to happen
594   // before Templight observers can be created
595   // FIXME: Move the truncation aspect of this into Sema, we delayed this till
596   // here so the source manager would be initialized.
597   EnsureSemaIsCreated(CI, *this);
598 
599   CI.getSema().TemplateInstCallbacks.push_back(
600       std::make_unique<DefaultTemplateInstCallback>());
601   ASTFrontendAction::ExecuteAction();
602 }
603 
604 namespace {
605   /// AST reader listener that dumps module information for a module
606   /// file.
607   class DumpModuleInfoListener : public ASTReaderListener {
608     llvm::raw_ostream &Out;
609 
610   public:
611     DumpModuleInfoListener(llvm::raw_ostream &Out) : Out(Out) { }
612 
613 #define DUMP_BOOLEAN(Value, Text)                       \
614     Out.indent(4) << Text << ": " << (Value? "Yes" : "No") << "\n"
615 
616     bool ReadFullVersionInformation(StringRef FullVersion) override {
617       Out.indent(2)
618         << "Generated by "
619         << (FullVersion == getClangFullRepositoryVersion()? "this"
620                                                           : "a different")
621         << " Clang: " << FullVersion << "\n";
622       return ASTReaderListener::ReadFullVersionInformation(FullVersion);
623     }
624 
625     void ReadModuleName(StringRef ModuleName) override {
626       Out.indent(2) << "Module name: " << ModuleName << "\n";
627     }
628     void ReadModuleMapFile(StringRef ModuleMapPath) override {
629       Out.indent(2) << "Module map file: " << ModuleMapPath << "\n";
630     }
631 
632     bool ReadLanguageOptions(const LangOptions &LangOpts, bool Complain,
633                              bool AllowCompatibleDifferences) override {
634       Out.indent(2) << "Language options:\n";
635 #define LANGOPT(Name, Bits, Default, Description) \
636       DUMP_BOOLEAN(LangOpts.Name, Description);
637 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
638       Out.indent(4) << Description << ": "                   \
639                     << static_cast<unsigned>(LangOpts.get##Name()) << "\n";
640 #define VALUE_LANGOPT(Name, Bits, Default, Description) \
641       Out.indent(4) << Description << ": " << LangOpts.Name << "\n";
642 #define BENIGN_LANGOPT(Name, Bits, Default, Description)
643 #define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
644 #include "clang/Basic/LangOptions.def"
645 
646       if (!LangOpts.ModuleFeatures.empty()) {
647         Out.indent(4) << "Module features:\n";
648         for (StringRef Feature : LangOpts.ModuleFeatures)
649           Out.indent(6) << Feature << "\n";
650       }
651 
652       return false;
653     }
654 
655     bool ReadTargetOptions(const TargetOptions &TargetOpts, 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                                bool Complain) override {
676       Out.indent(2) << "Diagnostic options:\n";
677 #define DIAGOPT(Name, Bits, Default) DUMP_BOOLEAN(DiagOpts->Name, #Name);
678 #define ENUM_DIAGOPT(Name, Type, Bits, Default) \
679       Out.indent(4) << #Name << ": " << DiagOpts->get##Name() << "\n";
680 #define VALUE_DIAGOPT(Name, Bits, Default) \
681       Out.indent(4) << #Name << ": " << DiagOpts->Name << "\n";
682 #include "clang/Basic/DiagnosticOptions.def"
683 
684       Out.indent(4) << "Diagnostic flags:\n";
685       for (const std::string &Warning : DiagOpts->Warnings)
686         Out.indent(6) << "-W" << Warning << "\n";
687       for (const std::string &Remark : DiagOpts->Remarks)
688         Out.indent(6) << "-R" << Remark << "\n";
689 
690       return false;
691     }
692 
693     bool ReadHeaderSearchOptions(const HeaderSearchOptions &HSOpts,
694                                  StringRef SpecificModuleCachePath,
695                                  bool Complain) override {
696       Out.indent(2) << "Header search options:\n";
697       Out.indent(4) << "System root [-isysroot=]: '" << HSOpts.Sysroot << "'\n";
698       Out.indent(4) << "Resource dir [ -resource-dir=]: '" << HSOpts.ResourceDir << "'\n";
699       Out.indent(4) << "Module Cache: '" << SpecificModuleCachePath << "'\n";
700       DUMP_BOOLEAN(HSOpts.UseBuiltinIncludes,
701                    "Use builtin include directories [-nobuiltininc]");
702       DUMP_BOOLEAN(HSOpts.UseStandardSystemIncludes,
703                    "Use standard system include directories [-nostdinc]");
704       DUMP_BOOLEAN(HSOpts.UseStandardCXXIncludes,
705                    "Use standard C++ include directories [-nostdinc++]");
706       DUMP_BOOLEAN(HSOpts.UseLibcxx,
707                    "Use libc++ (rather than libstdc++) [-stdlib=]");
708       return false;
709     }
710 
711     bool ReadPreprocessorOptions(const PreprocessorOptions &PPOpts,
712                                  bool Complain,
713                                  std::string &SuggestedPredefines) override {
714       Out.indent(2) << "Preprocessor options:\n";
715       DUMP_BOOLEAN(PPOpts.UsePredefines,
716                    "Uses compiler/target-specific predefines [-undef]");
717       DUMP_BOOLEAN(PPOpts.DetailedRecord,
718                    "Uses detailed preprocessing record (for indexing)");
719 
720       if (!PPOpts.Macros.empty()) {
721         Out.indent(4) << "Predefined macros:\n";
722       }
723 
724       for (std::vector<std::pair<std::string, bool/*isUndef*/> >::const_iterator
725              I = PPOpts.Macros.begin(), IEnd = PPOpts.Macros.end();
726            I != IEnd; ++I) {
727         Out.indent(6);
728         if (I->second)
729           Out << "-U";
730         else
731           Out << "-D";
732         Out << I->first << "\n";
733       }
734       return false;
735     }
736 
737     /// Indicates that a particular module file extension has been read.
738     void readModuleFileExtension(
739            const ModuleFileExtensionMetadata &Metadata) override {
740       Out.indent(2) << "Module file extension '"
741                     << Metadata.BlockName << "' " << Metadata.MajorVersion
742                     << "." << Metadata.MinorVersion;
743       if (!Metadata.UserInfo.empty()) {
744         Out << ": ";
745         Out.write_escaped(Metadata.UserInfo);
746       }
747 
748       Out << "\n";
749     }
750 
751     /// Tells the \c ASTReaderListener that we want to receive the
752     /// input files of the AST file via \c visitInputFile.
753     bool needsInputFileVisitation() override { return true; }
754 
755     /// Tells the \c ASTReaderListener that we want to receive the
756     /// input files of the AST file via \c visitInputFile.
757     bool needsSystemInputFileVisitation() override { return true; }
758 
759     /// Indicates that the AST file contains particular input file.
760     ///
761     /// \returns true to continue receiving the next input file, false to stop.
762     bool visitInputFile(StringRef Filename, bool isSystem,
763                         bool isOverridden, bool isExplicitModule) override {
764 
765       Out.indent(2) << "Input file: " << Filename;
766 
767       if (isSystem || isOverridden || isExplicitModule) {
768         Out << " [";
769         if (isSystem) {
770           Out << "System";
771           if (isOverridden || isExplicitModule)
772             Out << ", ";
773         }
774         if (isOverridden) {
775           Out << "Overridden";
776           if (isExplicitModule)
777             Out << ", ";
778         }
779         if (isExplicitModule)
780           Out << "ExplicitModule";
781 
782         Out << "]";
783       }
784 
785       Out << "\n";
786 
787       return true;
788     }
789 
790     /// Returns true if this \c ASTReaderListener wants to receive the
791     /// imports of the AST file via \c visitImport, false otherwise.
792     bool needsImportVisitation() const override { return true; }
793 
794     /// If needsImportVisitation returns \c true, this is called for each
795     /// AST file imported by this AST file.
796     void visitImport(StringRef ModuleName, StringRef Filename) override {
797       Out.indent(2) << "Imports module '" << ModuleName
798                     << "': " << Filename.str() << "\n";
799     }
800 #undef DUMP_BOOLEAN
801   };
802 }
803 
804 bool DumpModuleInfoAction::BeginInvocation(CompilerInstance &CI) {
805   // The Object file reader also supports raw ast files and there is no point in
806   // being strict about the module file format in -module-file-info mode.
807   CI.getHeaderSearchOpts().ModuleFormat = "obj";
808   return true;
809 }
810 
811 static StringRef ModuleKindName(Module::ModuleKind MK) {
812   switch (MK) {
813   case Module::ModuleMapModule:
814     return "Module Map Module";
815   case Module::ModuleInterfaceUnit:
816     return "Interface Unit";
817   case Module::ModulePartitionInterface:
818     return "Partition Interface";
819   case Module::ModulePartitionImplementation:
820     return "Partition Implementation";
821   case Module::GlobalModuleFragment:
822     return "Global Module Fragment";
823   case Module::PrivateModuleFragment:
824     return "Private Module Fragment";
825   }
826   llvm_unreachable("unknown module kind!");
827 }
828 
829 void DumpModuleInfoAction::ExecuteAction() {
830   assert(isCurrentFileAST() && "dumping non-AST?");
831   // Set up the output file.
832   std::unique_ptr<llvm::raw_fd_ostream> OutFile;
833   StringRef OutputFileName = getCompilerInstance().getFrontendOpts().OutputFile;
834   if (!OutputFileName.empty() && OutputFileName != "-") {
835     std::error_code EC;
836     OutFile.reset(new llvm::raw_fd_ostream(OutputFileName.str(), EC,
837                                            llvm::sys::fs::OF_TextWithCRLF));
838   }
839   llvm::raw_ostream &Out = OutFile.get()? *OutFile.get() : llvm::outs();
840 
841   Out << "Information for module file '" << getCurrentFile() << "':\n";
842   auto &FileMgr = getCompilerInstance().getFileManager();
843   auto Buffer = FileMgr.getBufferForFile(getCurrentFile());
844   StringRef Magic = (*Buffer)->getMemBufferRef().getBuffer();
845   bool IsRaw = (Magic.size() >= 4 && Magic[0] == 'C' && Magic[1] == 'P' &&
846                 Magic[2] == 'C' && Magic[3] == 'H');
847   Out << "  Module format: " << (IsRaw ? "raw" : "obj") << "\n";
848 
849   Preprocessor &PP = getCompilerInstance().getPreprocessor();
850   DumpModuleInfoListener Listener(Out);
851   HeaderSearchOptions &HSOpts = PP.getHeaderSearchInfo().getHeaderSearchOpts();
852 
853   // The FrontendAction::BeginSourceFile () method loads the AST so that much
854   // of the information is already available and modules should have been
855   // loaded.
856 
857   const LangOptions &LO = getCurrentASTUnit().getLangOpts();
858   if (LO.CPlusPlusModules && !LO.CurrentModule.empty()) {
859 
860     ASTReader *R = getCurrentASTUnit().getASTReader().get();
861     unsigned SubModuleCount = R->getTotalNumSubmodules();
862     serialization::ModuleFile &MF = R->getModuleManager().getPrimaryModule();
863     Out << "  ====== C++20 Module structure ======\n";
864 
865     if (MF.ModuleName != LO.CurrentModule)
866       Out << "  Mismatched module names : " << MF.ModuleName << " and "
867           << LO.CurrentModule << "\n";
868 
869     struct SubModInfo {
870       unsigned Idx;
871       Module *Mod;
872       Module::ModuleKind Kind;
873       std::string &Name;
874       bool Seen;
875     };
876     std::map<std::string, SubModInfo> SubModMap;
877     auto PrintSubMapEntry = [&](std::string Name, Module::ModuleKind Kind) {
878       Out << "    " << ModuleKindName(Kind) << " '" << Name << "'";
879       auto I = SubModMap.find(Name);
880       if (I == SubModMap.end())
881         Out << " was not found in the sub modules!\n";
882       else {
883         I->second.Seen = true;
884         Out << " is at index #" << I->second.Idx << "\n";
885       }
886     };
887     Module *Primary = nullptr;
888     for (unsigned Idx = 0; Idx <= SubModuleCount; ++Idx) {
889       Module *M = R->getModule(Idx);
890       if (!M)
891         continue;
892       if (M->Name == LO.CurrentModule) {
893         Primary = M;
894         Out << "  " << ModuleKindName(M->Kind) << " '" << LO.CurrentModule
895             << "' is the Primary Module at index #" << Idx << "\n";
896         SubModMap.insert({M->Name, {Idx, M, M->Kind, M->Name, true}});
897       } else
898         SubModMap.insert({M->Name, {Idx, M, M->Kind, M->Name, false}});
899     }
900     if (Primary) {
901       if (!Primary->submodules().empty())
902         Out << "   Sub Modules:\n";
903       for (auto MI : Primary->submodules()) {
904         PrintSubMapEntry(MI->Name, MI->Kind);
905       }
906       if (!Primary->Imports.empty())
907         Out << "   Imports:\n";
908       for (auto IMP : Primary->Imports) {
909         PrintSubMapEntry(IMP->Name, IMP->Kind);
910       }
911       if (!Primary->Exports.empty())
912         Out << "   Exports:\n";
913       for (unsigned MN = 0, N = Primary->Exports.size(); MN != N; ++MN) {
914         if (Module *M = Primary->Exports[MN].getPointer()) {
915           PrintSubMapEntry(M->Name, M->Kind);
916         }
917       }
918     }
919     // Now let's print out any modules we did not see as part of the Primary.
920     for (auto SM : SubModMap) {
921       if (!SM.second.Seen && SM.second.Mod) {
922         Out << "  " << ModuleKindName(SM.second.Kind) << " '" << SM.first
923             << "' at index #" << SM.second.Idx
924             << " has no direct reference in the Primary\n";
925       }
926     }
927     Out << "  ====== ======\n";
928   }
929 
930   // The reminder of the output is produced from the listener as the AST
931   // FileCcontrolBlock is (re-)parsed.
932   ASTReader::readASTFileControlBlock(
933       getCurrentFile(), FileMgr, getCompilerInstance().getPCHContainerReader(),
934       /*FindModuleFileExtensions=*/true, Listener,
935       HSOpts.ModulesValidateDiagnosticOptions);
936 }
937 
938 //===----------------------------------------------------------------------===//
939 // Preprocessor Actions
940 //===----------------------------------------------------------------------===//
941 
942 void DumpRawTokensAction::ExecuteAction() {
943   Preprocessor &PP = getCompilerInstance().getPreprocessor();
944   SourceManager &SM = PP.getSourceManager();
945 
946   // Start lexing the specified input file.
947   llvm::MemoryBufferRef FromFile = SM.getBufferOrFake(SM.getMainFileID());
948   Lexer RawLex(SM.getMainFileID(), FromFile, SM, PP.getLangOpts());
949   RawLex.SetKeepWhitespaceMode(true);
950 
951   Token RawTok;
952   RawLex.LexFromRawLexer(RawTok);
953   while (RawTok.isNot(tok::eof)) {
954     PP.DumpToken(RawTok, true);
955     llvm::errs() << "\n";
956     RawLex.LexFromRawLexer(RawTok);
957   }
958 }
959 
960 void DumpTokensAction::ExecuteAction() {
961   Preprocessor &PP = getCompilerInstance().getPreprocessor();
962   // Start preprocessing the specified input file.
963   Token Tok;
964   PP.EnterMainSourceFile();
965   do {
966     PP.Lex(Tok);
967     PP.DumpToken(Tok, true);
968     llvm::errs() << "\n";
969   } while (Tok.isNot(tok::eof));
970 }
971 
972 void PreprocessOnlyAction::ExecuteAction() {
973   Preprocessor &PP = getCompilerInstance().getPreprocessor();
974 
975   // Ignore unknown pragmas.
976   PP.IgnorePragmas();
977 
978   Token Tok;
979   // Start parsing the specified input file.
980   PP.EnterMainSourceFile();
981   do {
982     PP.Lex(Tok);
983   } while (Tok.isNot(tok::eof));
984 }
985 
986 void PrintPreprocessedAction::ExecuteAction() {
987   CompilerInstance &CI = getCompilerInstance();
988   // Output file may need to be set to 'Binary', to avoid converting Unix style
989   // line feeds (<LF>) to Microsoft style line feeds (<CR><LF>) on Windows.
990   //
991   // Look to see what type of line endings the file uses. If there's a
992   // CRLF, then we won't open the file up in binary mode. If there is
993   // just an LF or CR, then we will open the file up in binary mode.
994   // In this fashion, the output format should match the input format, unless
995   // the input format has inconsistent line endings.
996   //
997   // This should be a relatively fast operation since most files won't have
998   // all of their source code on a single line. However, that is still a
999   // concern, so if we scan for too long, we'll just assume the file should
1000   // be opened in binary mode.
1001 
1002   bool BinaryMode = false;
1003   if (llvm::Triple(LLVM_HOST_TRIPLE).isOSWindows()) {
1004     BinaryMode = true;
1005     const SourceManager &SM = CI.getSourceManager();
1006     if (llvm::Optional<llvm::MemoryBufferRef> Buffer =
1007             SM.getBufferOrNone(SM.getMainFileID())) {
1008       const char *cur = Buffer->getBufferStart();
1009       const char *end = Buffer->getBufferEnd();
1010       const char *next = (cur != end) ? cur + 1 : end;
1011 
1012       // Limit ourselves to only scanning 256 characters into the source
1013       // file.  This is mostly a check in case the file has no
1014       // newlines whatsoever.
1015       if (end - cur > 256)
1016         end = cur + 256;
1017 
1018       while (next < end) {
1019         if (*cur == 0x0D) {  // CR
1020           if (*next == 0x0A) // CRLF
1021             BinaryMode = false;
1022 
1023           break;
1024         } else if (*cur == 0x0A) // LF
1025           break;
1026 
1027         ++cur;
1028         ++next;
1029       }
1030     }
1031   }
1032 
1033   std::unique_ptr<raw_ostream> OS =
1034       CI.createDefaultOutputFile(BinaryMode, getCurrentFileOrBufferName());
1035   if (!OS) return;
1036 
1037   // If we're preprocessing a module map, start by dumping the contents of the
1038   // module itself before switching to the input buffer.
1039   auto &Input = getCurrentInput();
1040   if (Input.getKind().getFormat() == InputKind::ModuleMap) {
1041     if (Input.isFile()) {
1042       (*OS) << "# 1 \"";
1043       OS->write_escaped(Input.getFile());
1044       (*OS) << "\"\n";
1045     }
1046     getCurrentModule()->print(*OS);
1047     (*OS) << "#pragma clang module contents\n";
1048   }
1049 
1050   DoPrintPreprocessedInput(CI.getPreprocessor(), OS.get(),
1051                            CI.getPreprocessorOutputOpts());
1052 }
1053 
1054 void PrintPreambleAction::ExecuteAction() {
1055   switch (getCurrentFileKind().getLanguage()) {
1056   case Language::C:
1057   case Language::CXX:
1058   case Language::ObjC:
1059   case Language::ObjCXX:
1060   case Language::OpenCL:
1061   case Language::OpenCLCXX:
1062   case Language::CUDA:
1063   case Language::HIP:
1064     break;
1065 
1066   case Language::Unknown:
1067   case Language::Asm:
1068   case Language::LLVM_IR:
1069   case Language::RenderScript:
1070     // We can't do anything with these.
1071     return;
1072   }
1073 
1074   // We don't expect to find any #include directives in a preprocessed input.
1075   if (getCurrentFileKind().isPreprocessed())
1076     return;
1077 
1078   CompilerInstance &CI = getCompilerInstance();
1079   auto Buffer = CI.getFileManager().getBufferForFile(getCurrentFile());
1080   if (Buffer) {
1081     unsigned Preamble =
1082         Lexer::ComputePreamble((*Buffer)->getBuffer(), CI.getLangOpts()).Size;
1083     llvm::outs().write((*Buffer)->getBufferStart(), Preamble);
1084   }
1085 }
1086 
1087 void DumpCompilerOptionsAction::ExecuteAction() {
1088   CompilerInstance &CI = getCompilerInstance();
1089   std::unique_ptr<raw_ostream> OSP =
1090       CI.createDefaultOutputFile(false, getCurrentFile());
1091   if (!OSP)
1092     return;
1093 
1094   raw_ostream &OS = *OSP;
1095   const Preprocessor &PP = CI.getPreprocessor();
1096   const LangOptions &LangOpts = PP.getLangOpts();
1097 
1098   // FIXME: Rather than manually format the JSON (which is awkward due to
1099   // needing to remove trailing commas), this should make use of a JSON library.
1100   // FIXME: Instead of printing enums as an integral value and specifying the
1101   // type as a separate field, use introspection to print the enumerator.
1102 
1103   OS << "{\n";
1104   OS << "\n\"features\" : [\n";
1105   {
1106     llvm::SmallString<128> Str;
1107 #define FEATURE(Name, Predicate)                                               \
1108   ("\t{\"" #Name "\" : " + llvm::Twine(Predicate ? "true" : "false") + "},\n") \
1109       .toVector(Str);
1110 #include "clang/Basic/Features.def"
1111 #undef FEATURE
1112     // Remove the newline and comma from the last entry to ensure this remains
1113     // valid JSON.
1114     OS << Str.substr(0, Str.size() - 2);
1115   }
1116   OS << "\n],\n";
1117 
1118   OS << "\n\"extensions\" : [\n";
1119   {
1120     llvm::SmallString<128> Str;
1121 #define EXTENSION(Name, Predicate)                                             \
1122   ("\t{\"" #Name "\" : " + llvm::Twine(Predicate ? "true" : "false") + "},\n") \
1123       .toVector(Str);
1124 #include "clang/Basic/Features.def"
1125 #undef EXTENSION
1126     // Remove the newline and comma from the last entry to ensure this remains
1127     // valid JSON.
1128     OS << Str.substr(0, Str.size() - 2);
1129   }
1130   OS << "\n]\n";
1131 
1132   OS << "}";
1133 }
1134 
1135 void PrintDependencyDirectivesSourceMinimizerAction::ExecuteAction() {
1136   CompilerInstance &CI = getCompilerInstance();
1137   SourceManager &SM = CI.getPreprocessor().getSourceManager();
1138   llvm::MemoryBufferRef FromFile = SM.getBufferOrFake(SM.getMainFileID());
1139 
1140   llvm::SmallString<1024> Output;
1141   llvm::SmallVector<minimize_source_to_dependency_directives::Token, 32> Toks;
1142   if (minimizeSourceToDependencyDirectives(
1143           FromFile.getBuffer(), Output, Toks, &CI.getDiagnostics(),
1144           SM.getLocForStartOfFile(SM.getMainFileID()))) {
1145     assert(CI.getDiagnostics().hasErrorOccurred() &&
1146            "no errors reported for failure");
1147 
1148     // Preprocess the source when verifying the diagnostics to capture the
1149     // 'expected' comments.
1150     if (CI.getDiagnosticOpts().VerifyDiagnostics) {
1151       // Make sure we don't emit new diagnostics!
1152       CI.getDiagnostics().setSuppressAllDiagnostics(true);
1153       Preprocessor &PP = getCompilerInstance().getPreprocessor();
1154       PP.EnterMainSourceFile();
1155       Token Tok;
1156       do {
1157         PP.Lex(Tok);
1158       } while (Tok.isNot(tok::eof));
1159     }
1160     return;
1161   }
1162   llvm::outs() << Output;
1163 }
1164 
1165 void GetDependenciesByModuleNameAction::ExecuteAction() {
1166   CompilerInstance &CI = getCompilerInstance();
1167   Preprocessor &PP = CI.getPreprocessor();
1168   SourceManager &SM = PP.getSourceManager();
1169   FileID MainFileID = SM.getMainFileID();
1170   SourceLocation FileStart = SM.getLocForStartOfFile(MainFileID);
1171   SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> Path;
1172   IdentifierInfo *ModuleID = PP.getIdentifierInfo(ModuleName);
1173   Path.push_back(std::make_pair(ModuleID, FileStart));
1174   auto ModResult = CI.loadModule(FileStart, Path, Module::Hidden, false);
1175   PPCallbacks *CB = PP.getPPCallbacks();
1176   CB->moduleImport(SourceLocation(), Path, ModResult);
1177 }
1178