1 //===--- ASTUnit.cpp - ASTUnit utility ------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // ASTUnit Implementation.
12 //===----------------------------------------------------------------------===//
14 #include "clang/Frontend/ASTUnit.h"
15 #include "clang/Frontend/PCHReader.h"
16 #include "clang/AST/ASTContext.h"
17 #include "clang/AST/ASTConsumer.h"
18 #include "clang/AST/DeclVisitor.h"
19 #include "clang/AST/StmtVisitor.h"
20 #include "clang/Driver/Compilation.h"
21 #include "clang/Driver/Driver.h"
22 #include "clang/Driver/Job.h"
23 #include "clang/Driver/Tool.h"
24 #include "clang/Frontend/CompilerInstance.h"
25 #include "clang/Frontend/FrontendActions.h"
26 #include "clang/Frontend/FrontendDiagnostic.h"
27 #include "clang/Frontend/FrontendOptions.h"
28 #include "clang/Lex/HeaderSearch.h"
29 #include "clang/Lex/Preprocessor.h"
30 #include "clang/Basic/TargetOptions.h"
31 #include "clang/Basic/TargetInfo.h"
32 #include "clang/Basic/Diagnostic.h"
33 #include "llvm/Support/MemoryBuffer.h"
34 #include "llvm/System/Host.h"
35 #include "llvm/System/Path.h"
36 using namespace clang;
38 ASTUnit::ASTUnit(bool _MainFileIsAST)
39 : tempFile(false), MainFileIsAST(_MainFileIsAST) {
43 llvm::sys::Path(getPCHFileName()).eraseFromDisk();
48 /// \brief Gathers information from PCHReader that will be used to initialize
50 class PCHInfoCollector : public PCHReaderListener {
53 std::string &TargetTriple;
54 std::string &Predefines;
57 unsigned NumHeaderInfos;
60 PCHInfoCollector(LangOptions &LangOpt, HeaderSearch &HSI,
61 std::string &TargetTriple, std::string &Predefines,
63 : LangOpt(LangOpt), HSI(HSI), TargetTriple(TargetTriple),
64 Predefines(Predefines), Counter(Counter), NumHeaderInfos(0) {}
66 virtual bool ReadLanguageOptions(const LangOptions &LangOpts) {
71 virtual bool ReadTargetTriple(llvm::StringRef Triple) {
72 TargetTriple = Triple;
76 virtual bool ReadPredefinesBuffer(llvm::StringRef PCHPredef,
78 llvm::StringRef OriginalFileName,
79 std::string &SuggestedPredefines) {
80 Predefines = PCHPredef;
84 virtual void ReadHeaderFileInfo(const HeaderFileInfo &HFI) {
85 HSI.setHeaderFileInfoForUID(HFI, NumHeaderInfos++);
88 virtual void ReadCounter(unsigned Value) {
93 } // anonymous namespace
95 const std::string &ASTUnit::getOriginalSourceFileName() {
96 return OriginalSourceFile;
99 const std::string &ASTUnit::getPCHFileName() {
100 assert(isMainFileAST() && "Not an ASTUnit from a PCH file!");
101 return static_cast<PCHReader *>(Ctx->getExternalSource())->getFileName();
104 ASTUnit *ASTUnit::LoadFromPCHFile(const std::string &Filename,
107 RemappedFile *RemappedFiles,
108 unsigned NumRemappedFiles) {
109 llvm::OwningPtr<ASTUnit> AST(new ASTUnit(true));
110 AST->OnlyLocalDecls = OnlyLocalDecls;
111 AST->HeaderInfo.reset(new HeaderSearch(AST->getFileManager()));
113 for (unsigned I = 0; I != NumRemappedFiles; ++I) {
114 // Create the file entry for the file that we're mapping from.
115 const FileEntry *FromFile
116 = AST->getFileManager().getVirtualFile(RemappedFiles[I].first,
117 RemappedFiles[I].second->getBufferSize(),
120 Diags.Report(diag::err_fe_remap_missing_from_file)
121 << RemappedFiles[I].first;
125 // Override the contents of the "from" file with the contents of
127 AST->getSourceManager().overrideFileContents(FromFile,
128 RemappedFiles[I].second);
131 // Gather Info for preprocessor construction later on.
133 LangOptions LangInfo;
134 HeaderSearch &HeaderInfo = *AST->HeaderInfo.get();
135 std::string TargetTriple;
136 std::string Predefines;
139 llvm::OwningPtr<PCHReader> Reader;
140 llvm::OwningPtr<ExternalASTSource> Source;
142 Reader.reset(new PCHReader(AST->getSourceManager(), AST->getFileManager(),
144 Reader->setListener(new PCHInfoCollector(LangInfo, HeaderInfo, TargetTriple,
145 Predefines, Counter));
147 switch (Reader->ReadPCH(Filename)) {
148 case PCHReader::Success:
151 case PCHReader::Failure:
152 case PCHReader::IgnorePCH:
153 Diags.Report(diag::err_fe_unable_to_load_pch);
157 AST->OriginalSourceFile = Reader->getOriginalSourceFile();
159 // PCH loaded successfully. Now create the preprocessor.
161 // Get information about the target being compiled for.
163 // FIXME: This is broken, we should store the TargetOptions in the PCH.
164 TargetOptions TargetOpts;
167 TargetOpts.Features.clear();
168 TargetOpts.Triple = TargetTriple;
169 AST->Target.reset(TargetInfo::CreateTargetInfo(Diags, TargetOpts));
170 AST->PP.reset(new Preprocessor(Diags, LangInfo, *AST->Target.get(),
171 AST->getSourceManager(), HeaderInfo));
172 Preprocessor &PP = *AST->PP.get();
174 PP.setPredefines(Reader->getSuggestedPredefines());
175 PP.setCounterValue(Counter);
176 Reader->setPreprocessor(PP);
178 // Create and initialize the ASTContext.
180 AST->Ctx.reset(new ASTContext(LangInfo,
181 AST->getSourceManager(),
183 PP.getIdentifierTable(),
184 PP.getSelectorTable(),
186 /* FreeMemory = */ false,
187 /* size_reserve = */0));
188 ASTContext &Context = *AST->Ctx.get();
190 Reader->InitializeContext(Context);
192 // Attach the PCH reader to the AST context as an external AST
193 // source, so that declarations will be deserialized from the
194 // PCH file as needed.
195 Source.reset(Reader.take());
196 Context.setExternalSource(Source);
203 class TopLevelDeclTrackerConsumer : public ASTConsumer {
207 TopLevelDeclTrackerConsumer(ASTUnit &_Unit) : Unit(_Unit) {}
209 void HandleTopLevelDecl(DeclGroupRef D) {
210 for (DeclGroupRef::iterator it = D.begin(), ie = D.end(); it != ie; ++it)
211 Unit.getTopLevelDecls().push_back(*it);
215 class TopLevelDeclTrackerAction : public ASTFrontendAction {
219 virtual ASTConsumer *CreateASTConsumer(CompilerInstance &CI,
220 llvm::StringRef InFile) {
221 return new TopLevelDeclTrackerConsumer(Unit);
225 TopLevelDeclTrackerAction(ASTUnit &_Unit) : Unit(_Unit) {}
227 virtual bool hasCodeCompletionSupport() const { return false; }
232 ASTUnit *ASTUnit::LoadFromCompilerInvocation(CompilerInvocation *CI,
234 bool OnlyLocalDecls) {
235 // Create the compiler instance to use for building the AST.
236 CompilerInstance Clang;
237 llvm::OwningPtr<ASTUnit> AST;
238 llvm::OwningPtr<TopLevelDeclTrackerAction> Act;
240 Clang.setInvocation(CI);
242 Clang.setDiagnostics(&Diags);
243 Clang.setDiagnosticClient(Diags.getClient());
245 // Create the target instance.
246 Clang.setTarget(TargetInfo::CreateTargetInfo(Clang.getDiagnostics(),
247 Clang.getTargetOpts()));
248 if (!Clang.hasTarget())
251 // Inform the target of the language options.
253 // FIXME: We shouldn't need to do this, the target should be immutable once
254 // created. This complexity should be lifted elsewhere.
255 Clang.getTarget().setForcedLangOptions(Clang.getLangOpts());
257 assert(Clang.getFrontendOpts().Inputs.size() == 1 &&
258 "Invocation must have exactly one source file!");
259 assert(Clang.getFrontendOpts().Inputs[0].first != FrontendOptions::IK_AST &&
260 "FIXME: AST inputs not yet supported here!");
262 // Create the AST unit.
263 AST.reset(new ASTUnit(false));
265 AST->OnlyLocalDecls = OnlyLocalDecls;
266 AST->OriginalSourceFile = Clang.getFrontendOpts().Inputs[0].second;
268 // Create a file manager object to provide access to and cache the filesystem.
269 Clang.setFileManager(&AST->getFileManager());
271 // Create the source manager.
272 Clang.setSourceManager(&AST->getSourceManager());
274 // Create the preprocessor.
275 Clang.createPreprocessor();
277 Act.reset(new TopLevelDeclTrackerAction(*AST));
278 if (!Act->BeginSourceFile(Clang, Clang.getFrontendOpts().Inputs[0].second,
284 // Steal the created target, context, and preprocessor, and take back the
285 // source and file managers.
286 AST->Ctx.reset(Clang.takeASTContext());
287 AST->PP.reset(Clang.takePreprocessor());
288 Clang.takeSourceManager();
289 Clang.takeFileManager();
290 AST->Target.reset(Clang.takeTarget());
292 Act->EndSourceFile();
294 Clang.takeDiagnosticClient();
295 Clang.takeDiagnostics();
296 Clang.takeInvocation();
298 AST->Invocation.reset(Clang.takeInvocation());
302 Clang.takeSourceManager();
303 Clang.takeFileManager();
304 Clang.takeDiagnosticClient();
305 Clang.takeDiagnostics();
309 ASTUnit *ASTUnit::LoadFromCommandLine(const char **ArgBegin,
312 llvm::StringRef ResourceFilesPath,
314 RemappedFile *RemappedFiles,
315 unsigned NumRemappedFiles) {
316 llvm::SmallVector<const char *, 16> Args;
317 Args.push_back("<clang>"); // FIXME: Remove dummy argument.
318 Args.insert(Args.end(), ArgBegin, ArgEnd);
320 // FIXME: Find a cleaner way to force the driver into restricted modes. We
321 // also want to force it to use clang.
322 Args.push_back("-fsyntax-only");
324 // FIXME: We shouldn't have to pass in the path info.
325 driver::Driver TheDriver("clang", "/", llvm::sys::getHostTriple(),
326 "a.out", false, Diags);
328 // Don't check that inputs exist, they have been remapped.
329 TheDriver.setCheckInputsExist(false);
331 llvm::OwningPtr<driver::Compilation> C(
332 TheDriver.BuildCompilation(Args.size(), Args.data()));
334 // We expect to get back exactly one command job, if we didn't something
336 const driver::JobList &Jobs = C->getJobs();
337 if (Jobs.size() != 1 || !isa<driver::Command>(Jobs.begin())) {
338 llvm::SmallString<256> Msg;
339 llvm::raw_svector_ostream OS(Msg);
340 C->PrintJob(OS, C->getJobs(), "; ", true);
341 Diags.Report(diag::err_fe_expected_compiler_job) << OS.str();
345 const driver::Command *Cmd = cast<driver::Command>(*Jobs.begin());
346 if (llvm::StringRef(Cmd->getCreator().getName()) != "clang") {
347 Diags.Report(diag::err_fe_expected_clang_command);
351 const driver::ArgStringList &CCArgs = Cmd->getArguments();
352 llvm::OwningPtr<CompilerInvocation> CI(new CompilerInvocation);
353 CompilerInvocation::CreateFromArgs(*CI, (const char**) CCArgs.data(),
354 (const char**) CCArgs.data()+CCArgs.size(),
357 // Override any files that need remapping
358 for (unsigned I = 0; I != NumRemappedFiles; ++I)
359 CI->getPreprocessorOpts().addRemappedFile(RemappedFiles[I].first,
360 RemappedFiles[I].second);
362 // Override the resources path.
363 CI->getHeaderSearchOpts().ResourceDir = ResourceFilesPath;
365 CI->getFrontendOpts().DisableFree = true;
366 return LoadFromCompilerInvocation(CI.take(), Diags, OnlyLocalDecls);