CompilerInstance.cpp revision c2f484f1f05216a9a427ac84b5773789a4661111 
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"
28using namespace clang;
29
30CompilerInstance::CompilerInstance(llvm::LLVMContext *_LLVMContext,
31                                   bool _OwnsLLVMContext)
32  : LLVMContext(_LLVMContext),
33    OwnsLLVMContext(_OwnsLLVMContext) {
34    }
35
36CompilerInstance::~CompilerInstance() {
37  if (OwnsLLVMContext)
38    delete LLVMContext;
39}
40
41// Diagnostics
42
43static void SetUpBuildDumpLog(const DiagnosticOptions &DiagOpts,
44                              unsigned argc, char **argv,
45                              llvm::OwningPtr<DiagnosticClient> &DiagClient) {
46  std::string ErrorInfo;
47  llvm::raw_ostream *OS =
48    new llvm::raw_fd_ostream(DiagOpts.DumpBuildInformation.c_str(), ErrorInfo);
49  if (!ErrorInfo.empty()) {
50    // FIXME: Do not fail like this.
51    llvm::errs() << "error opening -dump-build-information file '"
52                 << DiagOpts.DumpBuildInformation << "', option ignored!\n";
53    delete OS;
54    return;
55  }
56
57  (*OS) << "clang-cc command line arguments: ";
58  for (unsigned i = 0; i != argc; ++i)
59    (*OS) << argv[i] << ' ';
60  (*OS) << '\n';
61
62  // Chain in a diagnostic client which will log the diagnostics.
63  DiagnosticClient *Logger =
64    new TextDiagnosticPrinter(*OS, DiagOpts, /*OwnsOutputStream=*/true);
65  DiagClient.reset(new ChainedDiagnosticClient(DiagClient.take(), Logger));
66}
67
68void CompilerInstance::createDiagnostics(int Argc, char **Argv) {
69  Diagnostics.reset(createDiagnostics(getDiagnosticOpts(), Argc, Argv));
70
71  if (Diagnostics)
72    DiagClient.reset(Diagnostics->getClient());
73}
74
75Diagnostic *CompilerInstance::createDiagnostics(const DiagnosticOptions &Opts,
76                                                int Argc, char **Argv) {
77  // Create the diagnostic client for reporting errors or for
78  // implementing -verify.
79  llvm::OwningPtr<DiagnosticClient> DiagClient;
80  if (Opts.VerifyDiagnostics) {
81    // When checking diagnostics, just buffer them up.
82    DiagClient.reset(new TextDiagnosticBuffer());
83  } else {
84    DiagClient.reset(new TextDiagnosticPrinter(llvm::errs(), Opts));
85  }
86
87  if (!Opts.DumpBuildInformation.empty())
88    SetUpBuildDumpLog(Opts, Argc, Argv, DiagClient);
89
90  // Configure our handling of diagnostics.
91  Diagnostic *Diags = new Diagnostic(DiagClient.take());
92  if (ProcessWarningOptions(*Diags, Opts))
93    return 0;
94
95  return Diags;
96}
97
98// File Manager
99
100void CompilerInstance::createFileManager() {
101  FileMgr.reset(new FileManager());
102}
103
104// Source Manager
105
106void CompilerInstance::createSourceManager() {
107  SourceMgr.reset(new SourceManager());
108}
109
110// Preprocessor
111
112void CompilerInstance::createPreprocessor() {
113  PP.reset(createPreprocessor(getDiagnostics(), getLangOpts(),
114                              getPreprocessorOpts(), getHeaderSearchOpts(),
115                              getDependencyOutputOpts(), getTarget(),
116                              getSourceManager(), getFileManager()));
117}
118
119Preprocessor *
120CompilerInstance::createPreprocessor(Diagnostic &Diags,
121                                     const LangOptions &LangInfo,
122                                     const PreprocessorOptions &PPOpts,
123                                     const HeaderSearchOptions &HSOpts,
124                                     const DependencyOutputOptions &DepOpts,
125                                     const TargetInfo &Target,
126                                     SourceManager &SourceMgr,
127                                     FileManager &FileMgr) {
128  // Create a PTH manager if we are using some form of a token cache.
129  PTHManager *PTHMgr = 0;
130  if (!PPOpts.getTokenCache().empty())
131    PTHMgr = PTHManager::Create(PPOpts.getTokenCache(), Diags);
132
133  // FIXME: Don't fail like this.
134  if (Diags.hasErrorOccurred())
135    exit(1);
136
137  // Create the Preprocessor.
138  HeaderSearch *HeaderInfo = new HeaderSearch(FileMgr);
139  Preprocessor *PP = new Preprocessor(Diags, LangInfo, Target,
140                                      SourceMgr, *HeaderInfo, PTHMgr,
141                                      /*OwnsHeaderSearch=*/true);
142
143  // Note that this is different then passing PTHMgr to Preprocessor's ctor.
144  // That argument is used as the IdentifierInfoLookup argument to
145  // IdentifierTable's ctor.
146  if (PTHMgr) {
147    PTHMgr->setPreprocessor(PP);
148    PP->setPTHManager(PTHMgr);
149  }
150
151  InitializePreprocessor(*PP, PPOpts, HSOpts);
152
153  // Handle generating dependencies, if requested.
154  if (!DepOpts.OutputFile.empty())
155    AttachDependencyFileGen(*PP, DepOpts);
156
157  return PP;
158}
159
160// ASTContext
161
162void CompilerInstance::createASTContext() {
163  Preprocessor &PP = getPreprocessor();
164  Context.reset(new ASTContext(getLangOpts(), PP.getSourceManager(),
165                               getTarget(), PP.getIdentifierTable(),
166                               PP.getSelectorTable(), PP.getBuiltinInfo(),
167                               /*FreeMemory=*/ !getFrontendOpts().DisableFree,
168                               /*size_reserve=*/ 0));
169}
170
171// ExternalASTSource
172
173void CompilerInstance::createPCHExternalASTSource(llvm::StringRef Path) {
174  llvm::OwningPtr<ExternalASTSource> Source;
175  Source.reset(createPCHExternalASTSource(Path, getHeaderSearchOpts().Sysroot,
176                                          getPreprocessor(), getASTContext()));
177  getASTContext().setExternalSource(Source);
178}
179
180ExternalASTSource *
181CompilerInstance::createPCHExternalASTSource(llvm::StringRef Path,
182                                             const std::string &Sysroot,
183                                             Preprocessor &PP,
184                                             ASTContext &Context) {
185  llvm::OwningPtr<PCHReader> Reader;
186  Reader.reset(new PCHReader(PP, &Context,
187                             Sysroot.empty() ? 0 : Sysroot.c_str()));
188
189  switch (Reader->ReadPCH(Path)) {
190  case PCHReader::Success:
191    // Set the predefines buffer as suggested by the PCH reader. Typically, the
192    // predefines buffer will be empty.
193    PP.setPredefines(Reader->getSuggestedPredefines());
194    return Reader.take();
195
196  case PCHReader::Failure:
197    // Unrecoverable failure: don't even try to process the input file.
198    break;
199
200  case PCHReader::IgnorePCH:
201    // No suitable PCH file could be found. Return an error.
202    break;
203  }
204
205  return 0;
206}
207
208// Code Completion
209
210void CompilerInstance::createCodeCompletionConsumer() {
211  const ParsedSourceLocation &Loc = getFrontendOpts().CodeCompletionAt;
212  CompletionConsumer.reset(
213    createCodeCompletionConsumer(getPreprocessor(),
214                                 Loc.FileName, Loc.Line, Loc.Column,
215                                 getFrontendOpts().DebugCodeCompletionPrinter,
216                                 getFrontendOpts().ShowMacrosInCodeCompletion,
217                                 llvm::outs()));
218}
219
220CodeCompleteConsumer *
221CompilerInstance::createCodeCompletionConsumer(Preprocessor &PP,
222                                               const std::string &Filename,
223                                               unsigned Line,
224                                               unsigned Column,
225                                               bool UseDebugPrinter,
226                                               bool ShowMacros,
227                                               llvm::raw_ostream &OS) {
228  // Tell the source manager to chop off the given file at a specific
229  // line and column.
230  const FileEntry *Entry = PP.getFileManager().getFile(Filename);
231  if (!Entry) {
232    PP.getDiagnostics().Report(diag::err_fe_invalid_code_complete_file)
233      << Filename;
234    return 0;
235  }
236
237  // Truncate the named file at the given line/column.
238  PP.getSourceManager().truncateFileAt(Entry, Line, Column);
239
240  // Set up the creation routine for code-completion.
241  if (UseDebugPrinter)
242    return new PrintingCodeCompleteConsumer(ShowMacros, OS);
243  else
244    return new CIndexCodeCompleteConsumer(ShowMacros, OS);
245}
246