• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 //===--- Tooling.cpp - Running clang standalone tools ---------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 //  This file implements functions to run clang tools standalone instead
11 //  of running them as a plugin.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #include "clang/Tooling/Tooling.h"
16 #include "clang/AST/ASTConsumer.h"
17 #include "clang/Driver/Compilation.h"
18 #include "clang/Driver/Driver.h"
19 #include "clang/Driver/Tool.h"
20 #include "clang/Driver/ToolChain.h"
21 #include "clang/Frontend/ASTUnit.h"
22 #include "clang/Frontend/CompilerInstance.h"
23 #include "clang/Frontend/FrontendDiagnostic.h"
24 #include "clang/Frontend/TextDiagnosticPrinter.h"
25 #include "clang/Tooling/ArgumentsAdjusters.h"
26 #include "clang/Tooling/CompilationDatabase.h"
27 #include "llvm/ADT/STLExtras.h"
28 #include "llvm/Config/llvm-config.h"
29 #include "llvm/Option/Option.h"
30 #include "llvm/Support/Debug.h"
31 #include "llvm/Support/FileSystem.h"
32 #include "llvm/Support/Host.h"
33 #include "llvm/Support/raw_ostream.h"
34 #include <utility>
35 
36 #define DEBUG_TYPE "clang-tooling"
37 
38 namespace clang {
39 namespace tooling {
40 
~ToolAction()41 ToolAction::~ToolAction() {}
42 
~FrontendActionFactory()43 FrontendActionFactory::~FrontendActionFactory() {}
44 
45 // FIXME: This file contains structural duplication with other parts of the
46 // code that sets up a compiler to run tools on it, and we should refactor
47 // it to be based on the same framework.
48 
49 /// \brief Builds a clang driver initialized for running clang tools.
newDriver(clang::DiagnosticsEngine * Diagnostics,const char * BinaryName,IntrusiveRefCntPtr<vfs::FileSystem> VFS)50 static clang::driver::Driver *newDriver(
51     clang::DiagnosticsEngine *Diagnostics, const char *BinaryName,
52     IntrusiveRefCntPtr<vfs::FileSystem> VFS) {
53   clang::driver::Driver *CompilerDriver =
54       new clang::driver::Driver(BinaryName, llvm::sys::getDefaultTargetTriple(),
55                                 *Diagnostics, std::move(VFS));
56   CompilerDriver->setTitle("clang_based_tool");
57   return CompilerDriver;
58 }
59 
60 /// \brief Retrieves the clang CC1 specific flags out of the compilation's jobs.
61 ///
62 /// Returns NULL on error.
getCC1Arguments(clang::DiagnosticsEngine * Diagnostics,clang::driver::Compilation * Compilation)63 static const llvm::opt::ArgStringList *getCC1Arguments(
64     clang::DiagnosticsEngine *Diagnostics,
65     clang::driver::Compilation *Compilation) {
66   // We expect to get back exactly one Command job, if we didn't something
67   // failed. Extract that job from the Compilation.
68   const clang::driver::JobList &Jobs = Compilation->getJobs();
69   if (Jobs.size() != 1 || !isa<clang::driver::Command>(*Jobs.begin())) {
70     SmallString<256> error_msg;
71     llvm::raw_svector_ostream error_stream(error_msg);
72     Jobs.Print(error_stream, "; ", true);
73     Diagnostics->Report(clang::diag::err_fe_expected_compiler_job)
74         << error_stream.str();
75     return nullptr;
76   }
77 
78   // The one job we find should be to invoke clang again.
79   const clang::driver::Command &Cmd =
80       cast<clang::driver::Command>(*Jobs.begin());
81   if (StringRef(Cmd.getCreator().getName()) != "clang") {
82     Diagnostics->Report(clang::diag::err_fe_expected_clang_command);
83     return nullptr;
84   }
85 
86   return &Cmd.getArguments();
87 }
88 
89 /// \brief Returns a clang build invocation initialized from the CC1 flags.
newInvocation(clang::DiagnosticsEngine * Diagnostics,const llvm::opt::ArgStringList & CC1Args)90 clang::CompilerInvocation *newInvocation(
91     clang::DiagnosticsEngine *Diagnostics,
92     const llvm::opt::ArgStringList &CC1Args) {
93   assert(!CC1Args.empty() && "Must at least contain the program name!");
94   clang::CompilerInvocation *Invocation = new clang::CompilerInvocation;
95   clang::CompilerInvocation::CreateFromArgs(
96       *Invocation, CC1Args.data() + 1, CC1Args.data() + CC1Args.size(),
97       *Diagnostics);
98   Invocation->getFrontendOpts().DisableFree = false;
99   Invocation->getCodeGenOpts().DisableFree = false;
100   Invocation->getDependencyOutputOpts() = DependencyOutputOptions();
101   return Invocation;
102 }
103 
runToolOnCode(clang::FrontendAction * ToolAction,const Twine & Code,const Twine & FileName,std::shared_ptr<PCHContainerOperations> PCHContainerOps)104 bool runToolOnCode(clang::FrontendAction *ToolAction, const Twine &Code,
105                    const Twine &FileName,
106                    std::shared_ptr<PCHContainerOperations> PCHContainerOps) {
107   return runToolOnCodeWithArgs(ToolAction, Code, std::vector<std::string>(),
108                                FileName, "clang-tool",
109                                std::move(PCHContainerOps));
110 }
111 
112 static std::vector<std::string>
getSyntaxOnlyToolArgs(const Twine & ToolName,const std::vector<std::string> & ExtraArgs,StringRef FileName)113 getSyntaxOnlyToolArgs(const Twine &ToolName,
114                       const std::vector<std::string> &ExtraArgs,
115                       StringRef FileName) {
116   std::vector<std::string> Args;
117   Args.push_back(ToolName.str());
118   Args.push_back("-fsyntax-only");
119   Args.insert(Args.end(), ExtraArgs.begin(), ExtraArgs.end());
120   Args.push_back(FileName.str());
121   return Args;
122 }
123 
runToolOnCodeWithArgs(clang::FrontendAction * ToolAction,const Twine & Code,const std::vector<std::string> & Args,const Twine & FileName,const Twine & ToolName,std::shared_ptr<PCHContainerOperations> PCHContainerOps,const FileContentMappings & VirtualMappedFiles)124 bool runToolOnCodeWithArgs(
125     clang::FrontendAction *ToolAction, const Twine &Code,
126     const std::vector<std::string> &Args, const Twine &FileName,
127     const Twine &ToolName,
128     std::shared_ptr<PCHContainerOperations> PCHContainerOps,
129     const FileContentMappings &VirtualMappedFiles) {
130 
131   SmallString<16> FileNameStorage;
132   StringRef FileNameRef = FileName.toNullTerminatedStringRef(FileNameStorage);
133   llvm::IntrusiveRefCntPtr<vfs::OverlayFileSystem> OverlayFileSystem(
134       new vfs::OverlayFileSystem(vfs::getRealFileSystem()));
135   llvm::IntrusiveRefCntPtr<vfs::InMemoryFileSystem> InMemoryFileSystem(
136       new vfs::InMemoryFileSystem);
137   OverlayFileSystem->pushOverlay(InMemoryFileSystem);
138   llvm::IntrusiveRefCntPtr<FileManager> Files(
139       new FileManager(FileSystemOptions(), OverlayFileSystem));
140   ToolInvocation Invocation(getSyntaxOnlyToolArgs(ToolName, Args, FileNameRef),
141                             ToolAction, Files.get(),
142                             std::move(PCHContainerOps));
143 
144   SmallString<1024> CodeStorage;
145   InMemoryFileSystem->addFile(FileNameRef, 0,
146                               llvm::MemoryBuffer::getMemBuffer(
147                                   Code.toNullTerminatedStringRef(CodeStorage)));
148 
149   for (auto &FilenameWithContent : VirtualMappedFiles) {
150     InMemoryFileSystem->addFile(
151         FilenameWithContent.first, 0,
152         llvm::MemoryBuffer::getMemBuffer(FilenameWithContent.second));
153   }
154 
155   return Invocation.run();
156 }
157 
getAbsolutePath(StringRef File)158 std::string getAbsolutePath(StringRef File) {
159   StringRef RelativePath(File);
160   // FIXME: Should '.\\' be accepted on Win32?
161   if (RelativePath.startswith("./")) {
162     RelativePath = RelativePath.substr(strlen("./"));
163   }
164 
165   SmallString<1024> AbsolutePath = RelativePath;
166   std::error_code EC = llvm::sys::fs::make_absolute(AbsolutePath);
167   assert(!EC);
168   (void)EC;
169   llvm::sys::path::native(AbsolutePath);
170   return AbsolutePath.str();
171 }
172 
addTargetAndModeForProgramName(std::vector<std::string> & CommandLine,StringRef InvokedAs)173 void addTargetAndModeForProgramName(std::vector<std::string> &CommandLine,
174                                     StringRef InvokedAs) {
175   if (!CommandLine.empty() && !InvokedAs.empty()) {
176     bool AlreadyHasTarget = false;
177     bool AlreadyHasMode = false;
178     // Skip CommandLine[0].
179     for (auto Token = ++CommandLine.begin(); Token != CommandLine.end();
180          ++Token) {
181       StringRef TokenRef(*Token);
182       AlreadyHasTarget |=
183           (TokenRef == "-target" || TokenRef.startswith("-target="));
184       AlreadyHasMode |= (TokenRef == "--driver-mode" ||
185                          TokenRef.startswith("--driver-mode="));
186     }
187     auto TargetMode =
188         clang::driver::ToolChain::getTargetAndModeFromProgramName(InvokedAs);
189     if (!AlreadyHasMode && !TargetMode.second.empty()) {
190       CommandLine.insert(++CommandLine.begin(), TargetMode.second);
191     }
192     if (!AlreadyHasTarget && !TargetMode.first.empty()) {
193       CommandLine.insert(++CommandLine.begin(), {"-target", TargetMode.first});
194     }
195   }
196 }
197 
198 namespace {
199 
200 class SingleFrontendActionFactory : public FrontendActionFactory {
201   FrontendAction *Action;
202 
203 public:
SingleFrontendActionFactory(FrontendAction * Action)204   SingleFrontendActionFactory(FrontendAction *Action) : Action(Action) {}
205 
create()206   FrontendAction *create() override { return Action; }
207 };
208 
209 }
210 
ToolInvocation(std::vector<std::string> CommandLine,ToolAction * Action,FileManager * Files,std::shared_ptr<PCHContainerOperations> PCHContainerOps)211 ToolInvocation::ToolInvocation(
212     std::vector<std::string> CommandLine, ToolAction *Action,
213     FileManager *Files, std::shared_ptr<PCHContainerOperations> PCHContainerOps)
214     : CommandLine(std::move(CommandLine)), Action(Action), OwnsAction(false),
215       Files(Files), PCHContainerOps(std::move(PCHContainerOps)),
216       DiagConsumer(nullptr) {}
217 
ToolInvocation(std::vector<std::string> CommandLine,FrontendAction * FAction,FileManager * Files,std::shared_ptr<PCHContainerOperations> PCHContainerOps)218 ToolInvocation::ToolInvocation(
219     std::vector<std::string> CommandLine, FrontendAction *FAction,
220     FileManager *Files, std::shared_ptr<PCHContainerOperations> PCHContainerOps)
221     : CommandLine(std::move(CommandLine)),
222       Action(new SingleFrontendActionFactory(FAction)), OwnsAction(true),
223       Files(Files), PCHContainerOps(std::move(PCHContainerOps)),
224       DiagConsumer(nullptr) {}
225 
~ToolInvocation()226 ToolInvocation::~ToolInvocation() {
227   if (OwnsAction)
228     delete Action;
229 }
230 
mapVirtualFile(StringRef FilePath,StringRef Content)231 void ToolInvocation::mapVirtualFile(StringRef FilePath, StringRef Content) {
232   SmallString<1024> PathStorage;
233   llvm::sys::path::native(FilePath, PathStorage);
234   MappedFileContents[PathStorage] = Content;
235 }
236 
run()237 bool ToolInvocation::run() {
238   std::vector<const char*> Argv;
239   for (const std::string &Str : CommandLine)
240     Argv.push_back(Str.c_str());
241   const char *const BinaryName = Argv[0];
242   IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
243   TextDiagnosticPrinter DiagnosticPrinter(
244       llvm::errs(), &*DiagOpts);
245   DiagnosticsEngine Diagnostics(
246       IntrusiveRefCntPtr<clang::DiagnosticIDs>(new DiagnosticIDs()), &*DiagOpts,
247       DiagConsumer ? DiagConsumer : &DiagnosticPrinter, false);
248 
249   const std::unique_ptr<clang::driver::Driver> Driver(
250       newDriver(&Diagnostics, BinaryName, Files->getVirtualFileSystem()));
251   // Since the input might only be virtual, don't check whether it exists.
252   Driver->setCheckInputsExist(false);
253   const std::unique_ptr<clang::driver::Compilation> Compilation(
254       Driver->BuildCompilation(llvm::makeArrayRef(Argv)));
255   const llvm::opt::ArgStringList *const CC1Args = getCC1Arguments(
256       &Diagnostics, Compilation.get());
257   if (!CC1Args) {
258     return false;
259   }
260   std::unique_ptr<clang::CompilerInvocation> Invocation(
261       newInvocation(&Diagnostics, *CC1Args));
262   // FIXME: remove this when all users have migrated!
263   for (const auto &It : MappedFileContents) {
264     // Inject the code as the given file name into the preprocessor options.
265     std::unique_ptr<llvm::MemoryBuffer> Input =
266         llvm::MemoryBuffer::getMemBuffer(It.getValue());
267     Invocation->getPreprocessorOpts().addRemappedFile(It.getKey(),
268                                                       Input.release());
269   }
270   return runInvocation(BinaryName, Compilation.get(), Invocation.release(),
271                        std::move(PCHContainerOps));
272 }
273 
runInvocation(const char * BinaryName,clang::driver::Compilation * Compilation,clang::CompilerInvocation * Invocation,std::shared_ptr<PCHContainerOperations> PCHContainerOps)274 bool ToolInvocation::runInvocation(
275     const char *BinaryName, clang::driver::Compilation *Compilation,
276     clang::CompilerInvocation *Invocation,
277     std::shared_ptr<PCHContainerOperations> PCHContainerOps) {
278   // Show the invocation, with -v.
279   if (Invocation->getHeaderSearchOpts().Verbose) {
280     llvm::errs() << "clang Invocation:\n";
281     Compilation->getJobs().Print(llvm::errs(), "\n", true);
282     llvm::errs() << "\n";
283   }
284 
285   return Action->runInvocation(Invocation, Files, std::move(PCHContainerOps),
286                                DiagConsumer);
287 }
288 
runInvocation(CompilerInvocation * Invocation,FileManager * Files,std::shared_ptr<PCHContainerOperations> PCHContainerOps,DiagnosticConsumer * DiagConsumer)289 bool FrontendActionFactory::runInvocation(
290     CompilerInvocation *Invocation, FileManager *Files,
291     std::shared_ptr<PCHContainerOperations> PCHContainerOps,
292     DiagnosticConsumer *DiagConsumer) {
293   // Create a compiler instance to handle the actual work.
294   clang::CompilerInstance Compiler(std::move(PCHContainerOps));
295   Compiler.setInvocation(Invocation);
296   Compiler.setFileManager(Files);
297 
298   // The FrontendAction can have lifetime requirements for Compiler or its
299   // members, and we need to ensure it's deleted earlier than Compiler. So we
300   // pass it to an std::unique_ptr declared after the Compiler variable.
301   std::unique_ptr<FrontendAction> ScopedToolAction(create());
302 
303   // Create the compiler's actual diagnostics engine.
304   Compiler.createDiagnostics(DiagConsumer, /*ShouldOwnClient=*/false);
305   if (!Compiler.hasDiagnostics())
306     return false;
307 
308   Compiler.createSourceManager(*Files);
309 
310   const bool Success = Compiler.ExecuteAction(*ScopedToolAction);
311 
312   Files->clearStatCaches();
313   return Success;
314 }
315 
ClangTool(const CompilationDatabase & Compilations,ArrayRef<std::string> SourcePaths,std::shared_ptr<PCHContainerOperations> PCHContainerOps)316 ClangTool::ClangTool(const CompilationDatabase &Compilations,
317                      ArrayRef<std::string> SourcePaths,
318                      std::shared_ptr<PCHContainerOperations> PCHContainerOps)
319     : Compilations(Compilations), SourcePaths(SourcePaths),
320       PCHContainerOps(std::move(PCHContainerOps)),
321       OverlayFileSystem(new vfs::OverlayFileSystem(vfs::getRealFileSystem())),
322       InMemoryFileSystem(new vfs::InMemoryFileSystem),
323       Files(new FileManager(FileSystemOptions(), OverlayFileSystem)),
324       DiagConsumer(nullptr) {
325   OverlayFileSystem->pushOverlay(InMemoryFileSystem);
326   appendArgumentsAdjuster(getClangStripOutputAdjuster());
327   appendArgumentsAdjuster(getClangSyntaxOnlyAdjuster());
328 }
329 
~ClangTool()330 ClangTool::~ClangTool() {}
331 
mapVirtualFile(StringRef FilePath,StringRef Content)332 void ClangTool::mapVirtualFile(StringRef FilePath, StringRef Content) {
333   MappedFileContents.push_back(std::make_pair(FilePath, Content));
334 }
335 
appendArgumentsAdjuster(ArgumentsAdjuster Adjuster)336 void ClangTool::appendArgumentsAdjuster(ArgumentsAdjuster Adjuster) {
337   if (ArgsAdjuster)
338     ArgsAdjuster =
339         combineAdjusters(std::move(ArgsAdjuster), std::move(Adjuster));
340   else
341     ArgsAdjuster = std::move(Adjuster);
342 }
343 
clearArgumentsAdjusters()344 void ClangTool::clearArgumentsAdjusters() {
345   ArgsAdjuster = nullptr;
346 }
347 
injectResourceDir(CommandLineArguments & Args,const char * Argv0,void * MainAddr)348 static void injectResourceDir(CommandLineArguments &Args, const char *Argv0,
349                               void *MainAddr) {
350   // Allow users to override the resource dir.
351   for (StringRef Arg : Args)
352     if (Arg.startswith("-resource-dir"))
353       return;
354 
355   // If there's no override in place add our resource dir.
356   Args.push_back("-resource-dir=" +
357                  CompilerInvocation::GetResourcesPath(Argv0, MainAddr));
358 }
359 
run(ToolAction * Action)360 int ClangTool::run(ToolAction *Action) {
361   // Exists solely for the purpose of lookup of the resource path.
362   // This just needs to be some symbol in the binary.
363   static int StaticSymbol;
364 
365   llvm::SmallString<128> InitialDirectory;
366   if (std::error_code EC = llvm::sys::fs::current_path(InitialDirectory))
367     llvm::report_fatal_error("Cannot detect current path: " +
368                              Twine(EC.message()));
369 
370   // First insert all absolute paths into the in-memory VFS. These are global
371   // for all compile commands.
372   if (SeenWorkingDirectories.insert("/").second)
373     for (const auto &MappedFile : MappedFileContents)
374       if (llvm::sys::path::is_absolute(MappedFile.first))
375         InMemoryFileSystem->addFile(
376             MappedFile.first, 0,
377             llvm::MemoryBuffer::getMemBuffer(MappedFile.second));
378 
379   bool ProcessingFailed = false;
380   for (const auto &SourcePath : SourcePaths) {
381     std::string File(getAbsolutePath(SourcePath));
382 
383     // Currently implementations of CompilationDatabase::getCompileCommands can
384     // change the state of the file system (e.g.  prepare generated headers), so
385     // this method needs to run right before we invoke the tool, as the next
386     // file may require a different (incompatible) state of the file system.
387     //
388     // FIXME: Make the compilation database interface more explicit about the
389     // requirements to the order of invocation of its members.
390     std::vector<CompileCommand> CompileCommandsForFile =
391         Compilations.getCompileCommands(File);
392     if (CompileCommandsForFile.empty()) {
393       // FIXME: There are two use cases here: doing a fuzzy
394       // "find . -name '*.cc' |xargs tool" match, where as a user I don't care
395       // about the .cc files that were not found, and the use case where I
396       // specify all files I want to run over explicitly, where this should
397       // be an error. We'll want to add an option for this.
398       llvm::errs() << "Skipping " << File << ". Compile command not found.\n";
399       continue;
400     }
401     for (CompileCommand &CompileCommand : CompileCommandsForFile) {
402       // FIXME: chdir is thread hostile; on the other hand, creating the same
403       // behavior as chdir is complex: chdir resolves the path once, thus
404       // guaranteeing that all subsequent relative path operations work
405       // on the same path the original chdir resulted in. This makes a
406       // difference for example on network filesystems, where symlinks might be
407       // switched during runtime of the tool. Fixing this depends on having a
408       // file system abstraction that allows openat() style interactions.
409       if (OverlayFileSystem->setCurrentWorkingDirectory(
410               CompileCommand.Directory))
411         llvm::report_fatal_error("Cannot chdir into \"" +
412                                  Twine(CompileCommand.Directory) + "\n!");
413 
414       // Now fill the in-memory VFS with the relative file mappings so it will
415       // have the correct relative paths. We never remove mappings but that
416       // should be fine.
417       if (SeenWorkingDirectories.insert(CompileCommand.Directory).second)
418         for (const auto &MappedFile : MappedFileContents)
419           if (!llvm::sys::path::is_absolute(MappedFile.first))
420             InMemoryFileSystem->addFile(
421                 MappedFile.first, 0,
422                 llvm::MemoryBuffer::getMemBuffer(MappedFile.second));
423 
424       std::vector<std::string> CommandLine = CompileCommand.CommandLine;
425       if (ArgsAdjuster)
426         CommandLine = ArgsAdjuster(CommandLine, CompileCommand.Filename);
427       assert(!CommandLine.empty());
428 
429       // Add the resource dir based on the binary of this tool. argv[0] in the
430       // compilation database may refer to a different compiler and we want to
431       // pick up the very same standard library that compiler is using. The
432       // builtin headers in the resource dir need to match the exact clang
433       // version the tool is using.
434       // FIXME: On linux, GetMainExecutable is independent of the value of the
435       // first argument, thus allowing ClangTool and runToolOnCode to just
436       // pass in made-up names here. Make sure this works on other platforms.
437       injectResourceDir(CommandLine, "clang_tool", &StaticSymbol);
438 
439       // FIXME: We need a callback mechanism for the tool writer to output a
440       // customized message for each file.
441       DEBUG({ llvm::dbgs() << "Processing: " << File << ".\n"; });
442       ToolInvocation Invocation(std::move(CommandLine), Action, Files.get(),
443                                 PCHContainerOps);
444       Invocation.setDiagnosticConsumer(DiagConsumer);
445 
446       if (!Invocation.run()) {
447         // FIXME: Diagnostics should be used instead.
448         llvm::errs() << "Error while processing " << File << ".\n";
449         ProcessingFailed = true;
450       }
451       // Return to the initial directory to correctly resolve next file by
452       // relative path.
453       if (OverlayFileSystem->setCurrentWorkingDirectory(InitialDirectory.c_str()))
454         llvm::report_fatal_error("Cannot chdir into \"" +
455                                  Twine(InitialDirectory) + "\n!");
456     }
457   }
458   return ProcessingFailed ? 1 : 0;
459 }
460 
461 namespace {
462 
463 class ASTBuilderAction : public ToolAction {
464   std::vector<std::unique_ptr<ASTUnit>> &ASTs;
465 
466 public:
ASTBuilderAction(std::vector<std::unique_ptr<ASTUnit>> & ASTs)467   ASTBuilderAction(std::vector<std::unique_ptr<ASTUnit>> &ASTs) : ASTs(ASTs) {}
468 
runInvocation(CompilerInvocation * Invocation,FileManager * Files,std::shared_ptr<PCHContainerOperations> PCHContainerOps,DiagnosticConsumer * DiagConsumer)469   bool runInvocation(CompilerInvocation *Invocation, FileManager *Files,
470                      std::shared_ptr<PCHContainerOperations> PCHContainerOps,
471                      DiagnosticConsumer *DiagConsumer) override {
472     std::unique_ptr<ASTUnit> AST = ASTUnit::LoadFromCompilerInvocation(
473         Invocation, std::move(PCHContainerOps),
474         CompilerInstance::createDiagnostics(&Invocation->getDiagnosticOpts(),
475                                             DiagConsumer,
476                                             /*ShouldOwnClient=*/false),
477         Files);
478     if (!AST)
479       return false;
480 
481     ASTs.push_back(std::move(AST));
482     return true;
483   }
484 };
485 }
486 
buildASTs(std::vector<std::unique_ptr<ASTUnit>> & ASTs)487 int ClangTool::buildASTs(std::vector<std::unique_ptr<ASTUnit>> &ASTs) {
488   ASTBuilderAction Action(ASTs);
489   return run(&Action);
490 }
491 
492 std::unique_ptr<ASTUnit>
buildASTFromCode(const Twine & Code,const Twine & FileName,std::shared_ptr<PCHContainerOperations> PCHContainerOps)493 buildASTFromCode(const Twine &Code, const Twine &FileName,
494                  std::shared_ptr<PCHContainerOperations> PCHContainerOps) {
495   return buildASTFromCodeWithArgs(Code, std::vector<std::string>(), FileName,
496                                   "clang-tool", std::move(PCHContainerOps));
497 }
498 
buildASTFromCodeWithArgs(const Twine & Code,const std::vector<std::string> & Args,const Twine & FileName,const Twine & ToolName,std::shared_ptr<PCHContainerOperations> PCHContainerOps)499 std::unique_ptr<ASTUnit> buildASTFromCodeWithArgs(
500     const Twine &Code, const std::vector<std::string> &Args,
501     const Twine &FileName, const Twine &ToolName,
502     std::shared_ptr<PCHContainerOperations> PCHContainerOps) {
503   SmallString<16> FileNameStorage;
504   StringRef FileNameRef = FileName.toNullTerminatedStringRef(FileNameStorage);
505 
506   std::vector<std::unique_ptr<ASTUnit>> ASTs;
507   ASTBuilderAction Action(ASTs);
508   llvm::IntrusiveRefCntPtr<vfs::OverlayFileSystem> OverlayFileSystem(
509       new vfs::OverlayFileSystem(vfs::getRealFileSystem()));
510   llvm::IntrusiveRefCntPtr<vfs::InMemoryFileSystem> InMemoryFileSystem(
511       new vfs::InMemoryFileSystem);
512   OverlayFileSystem->pushOverlay(InMemoryFileSystem);
513   llvm::IntrusiveRefCntPtr<FileManager> Files(
514       new FileManager(FileSystemOptions(), OverlayFileSystem));
515   ToolInvocation Invocation(getSyntaxOnlyToolArgs(ToolName, Args, FileNameRef),
516                             &Action, Files.get(), std::move(PCHContainerOps));
517 
518   SmallString<1024> CodeStorage;
519   InMemoryFileSystem->addFile(FileNameRef, 0,
520                               llvm::MemoryBuffer::getMemBuffer(
521                                   Code.toNullTerminatedStringRef(CodeStorage)));
522   if (!Invocation.run())
523     return nullptr;
524 
525   assert(ASTs.size() == 1);
526   return std::move(ASTs[0]);
527 }
528 
529 } // end namespace tooling
530 } // end namespace clang
531