CompilerInstance.cpp revision 644714d2905c1a553e81731004b7d6fbd87b937d 
1//===--- CompilerInstance.cpp ---------------------------------------------===//
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#include "clang/Frontend/CompilerInstance.h"
11#include "clang/AST/ASTContext.h"
12#include "clang/Basic/Diagnostic.h"
13#include "clang/Basic/FileManager.h"
14#include "clang/Basic/SourceManager.h"
15#include "clang/Basic/TargetInfo.h"
16#include "clang/Lex/HeaderSearch.h"
17#include "clang/Lex/Preprocessor.h"
18#include "clang/Lex/PTHManager.h"
19#include "clang/Frontend/ChainedDiagnosticClient.h"
20#include "clang/Frontend/PCHReader.h"
21#include "clang/Frontend/FrontendDiagnostic.h"
22#include "clang/Frontend/TextDiagnosticBuffer.h"
23#include "clang/Frontend/TextDiagnosticPrinter.h"
24#include "clang/Frontend/Utils.h"
25#include "clang/Sema/CodeCompleteConsumer.h"
26#include "llvm/LLVMContext.h"
27#include "llvm/Support/raw_ostream.h"
28#include "llvm/System/Path.h"
29using namespace clang;
30
31CompilerInstance::CompilerInstance(llvm::LLVMContext *_LLVMContext,
32                                   bool _OwnsLLVMContext)
33  : LLVMContext(_LLVMContext),
34    OwnsLLVMContext(_OwnsLLVMContext) {
35    }
36
37CompilerInstance::~CompilerInstance() {
38  if (OwnsLLVMContext)
39    delete LLVMContext;
40}
41
42// Diagnostics
43
44static void SetUpBuildDumpLog(const DiagnosticOptions &DiagOpts,
45                              unsigned argc, char **argv,
46                              llvm::OwningPtr<DiagnosticClient> &DiagClient) {
47  std::string ErrorInfo;
48  llvm::raw_ostream *OS =
49    new llvm::raw_fd_ostream(DiagOpts.DumpBuildInformation.c_str(), ErrorInfo);
50  if (!ErrorInfo.empty()) {
51    // FIXME: Do not fail like this.
52    llvm::errs() << "error opening -dump-build-information file '"
53                 << DiagOpts.DumpBuildInformation << "', option ignored!\n";
54    delete OS;
55    return;
56  }
57
58  (*OS) << "clang-cc command line arguments: ";
59  for (unsigned i = 0; i != argc; ++i)
60    (*OS) << argv[i] << ' ';
61  (*OS) << '\n';
62
63  // Chain in a diagnostic client which will log the diagnostics.
64  DiagnosticClient *Logger =
65    new TextDiagnosticPrinter(*OS, DiagOpts, /*OwnsOutputStream=*/true);
66  DiagClient.reset(new ChainedDiagnosticClient(DiagClient.take(), Logger));
67}
68
69void CompilerInstance::createDiagnostics(int Argc, char **Argv) {
70  Diagnostics.reset(createDiagnostics(getDiagnosticOpts(), Argc, Argv));
71
72  if (Diagnostics)
73    DiagClient.reset(Diagnostics->getClient());
74}
75
76Diagnostic *CompilerInstance::createDiagnostics(const DiagnosticOptions &Opts,
77                                                int Argc, char **Argv) {
78  // Create the diagnostic client for reporting errors or for
79  // implementing -verify.
80  llvm::OwningPtr<DiagnosticClient> DiagClient;
81  if (Opts.VerifyDiagnostics) {
82    // When checking diagnostics, just buffer them up.
83    DiagClient.reset(new TextDiagnosticBuffer());
84  } else {
85    DiagClient.reset(new TextDiagnosticPrinter(llvm::errs(), Opts));
86  }
87
88  if (!Opts.DumpBuildInformation.empty())
89    SetUpBuildDumpLog(Opts, Argc, Argv, DiagClient);
90
91  // Configure our handling of diagnostics.
92  Diagnostic *Diags = new Diagnostic(DiagClient.take());
93  if (ProcessWarningOptions(*Diags, Opts))
94    return 0;
95
96  return Diags;
97}
98
99// File Manager
100
101void CompilerInstance::createFileManager() {
102  FileMgr.reset(new FileManager());
103}
104
105// Source Manager
106
107void CompilerInstance::createSourceManager() {
108  SourceMgr.reset(new SourceManager());
109}
110
111// Preprocessor
112
113void CompilerInstance::createPreprocessor() {
114  PP.reset(createPreprocessor(getDiagnostics(), getLangOpts(),
115                              getPreprocessorOpts(), getHeaderSearchOpts(),
116                              getDependencyOutputOpts(), getTarget(),
117                              getSourceManager(), getFileManager()));
118}
119
120Preprocessor *
121CompilerInstance::createPreprocessor(Diagnostic &Diags,
122                                     const LangOptions &LangInfo,
123                                     const PreprocessorOptions &PPOpts,
124                                     const HeaderSearchOptions &HSOpts,
125                                     const DependencyOutputOptions &DepOpts,
126                                     const TargetInfo &Target,
127                                     SourceManager &SourceMgr,
128                                     FileManager &FileMgr) {
129  // Create a PTH manager if we are using some form of a token cache.
130  PTHManager *PTHMgr = 0;
131  if (!PPOpts.getTokenCache().empty())
132    PTHMgr = PTHManager::Create(PPOpts.getTokenCache(), Diags);
133
134  // FIXME: Don't fail like this.
135  if (Diags.hasErrorOccurred())
136    exit(1);
137
138  // Create the Preprocessor.
139  HeaderSearch *HeaderInfo = new HeaderSearch(FileMgr);
140  Preprocessor *PP = new Preprocessor(Diags, LangInfo, Target,
141                                      SourceMgr, *HeaderInfo, PTHMgr,
142                                      /*OwnsHeaderSearch=*/true);
143
144  // Note that this is different then passing PTHMgr to Preprocessor's ctor.
145  // That argument is used as the IdentifierInfoLookup argument to
146  // IdentifierTable's ctor.
147  if (PTHMgr) {
148    PTHMgr->setPreprocessor(PP);
149    PP->setPTHManager(PTHMgr);
150  }
151
152  InitializePreprocessor(*PP, PPOpts, HSOpts);
153
154  // Handle generating dependencies, if requested.
155  if (!DepOpts.OutputFile.empty())
156    AttachDependencyFileGen(*PP, DepOpts);
157
158  return PP;
159}
160
161// ASTContext
162
163void CompilerInstance::createASTContext() {
164  Preprocessor &PP = getPreprocessor();
165  Context.reset(new ASTContext(getLangOpts(), PP.getSourceManager(),
166                               getTarget(), PP.getIdentifierTable(),
167                               PP.getSelectorTable(), PP.getBuiltinInfo(),
168                               /*FreeMemory=*/ !getFrontendOpts().DisableFree,
169                               /*size_reserve=*/ 0));
170}
171
172// ExternalASTSource
173
174void CompilerInstance::createPCHExternalASTSource(llvm::StringRef Path) {
175  llvm::OwningPtr<ExternalASTSource> Source;
176  Source.reset(createPCHExternalASTSource(Path, getHeaderSearchOpts().Sysroot,
177                                          getPreprocessor(), getASTContext()));
178  getASTContext().setExternalSource(Source);
179}
180
181ExternalASTSource *
182CompilerInstance::createPCHExternalASTSource(llvm::StringRef Path,
183                                             const std::string &Sysroot,
184                                             Preprocessor &PP,
185                                             ASTContext &Context) {
186  llvm::OwningPtr<PCHReader> Reader;
187  Reader.reset(new PCHReader(PP, &Context,
188                             Sysroot.empty() ? 0 : Sysroot.c_str()));
189
190  switch (Reader->ReadPCH(Path)) {
191  case PCHReader::Success:
192    // Set the predefines buffer as suggested by the PCH reader. Typically, the
193    // predefines buffer will be empty.
194    PP.setPredefines(Reader->getSuggestedPredefines());
195    return Reader.take();
196
197  case PCHReader::Failure:
198    // Unrecoverable failure: don't even try to process the input file.
199    break;
200
201  case PCHReader::IgnorePCH:
202    // No suitable PCH file could be found. Return an error.
203    break;
204  }
205
206  return 0;
207}
208
209// Code Completion
210
211void CompilerInstance::createCodeCompletionConsumer() {
212  const ParsedSourceLocation &Loc = getFrontendOpts().CodeCompletionAt;
213  CompletionConsumer.reset(
214    createCodeCompletionConsumer(getPreprocessor(),
215                                 Loc.FileName, Loc.Line, Loc.Column,
216                                 getFrontendOpts().DebugCodeCompletionPrinter,
217                                 getFrontendOpts().ShowMacrosInCodeCompletion,
218                                 llvm::outs()));
219}
220
221CodeCompleteConsumer *
222CompilerInstance::createCodeCompletionConsumer(Preprocessor &PP,
223                                               const std::string &Filename,
224                                               unsigned Line,
225                                               unsigned Column,
226                                               bool UseDebugPrinter,
227                                               bool ShowMacros,
228                                               llvm::raw_ostream &OS) {
229  // Tell the source manager to chop off the given file at a specific
230  // line and column.
231  const FileEntry *Entry = PP.getFileManager().getFile(Filename);
232  if (!Entry) {
233    PP.getDiagnostics().Report(diag::err_fe_invalid_code_complete_file)
234      << Filename;
235    return 0;
236  }
237
238  // Truncate the named file at the given line/column.
239  PP.getSourceManager().truncateFileAt(Entry, Line, Column);
240
241  // Set up the creation routine for code-completion.
242  if (UseDebugPrinter)
243    return new PrintingCodeCompleteConsumer(ShowMacros, OS);
244  else
245    return new CIndexCodeCompleteConsumer(ShowMacros, OS);
246}
247
248// Output Files
249
250void CompilerInstance::addOutputFile(llvm::StringRef Path,
251                                     llvm::raw_ostream *OS) {
252  assert(OS && "Attempt to add empty stream to output list!");
253  OutputFiles.push_back(std::make_pair(Path, OS));
254}
255
256void CompilerInstance::ClearOutputFiles(bool EraseFiles) {
257  for (std::list< std::pair<std::string, llvm::raw_ostream*> >::iterator
258         it = OutputFiles.begin(), ie = OutputFiles.end(); it != ie; ++it) {
259    delete it->second;
260    if (EraseFiles && !it->first.empty())
261      llvm::sys::Path(it->first).eraseFromDisk();
262  }
263  OutputFiles.clear();
264}
265
266