FrontendActions.cpp revision 467dc88512b4ba4bb16e274ea3771dc1415d31da 
1//===--- FrontendActions.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/FrontendActions.h"
11#include "clang/AST/ASTConsumer.h"
12#include "clang/Lex/Pragma.h"
13#include "clang/Lex/Preprocessor.h"
14#include "clang/Parse/Parser.h"
15#include "clang/Basic/FileManager.h"
16#include "clang/Frontend/ASTConsumers.h"
17#include "clang/Frontend/ASTUnit.h"
18#include "clang/Frontend/CompilerInstance.h"
19#include "clang/Frontend/FrontendDiagnostic.h"
20#include "clang/Frontend/Utils.h"
21#include "clang/Serialization/ASTWriter.h"
22#include "llvm/ADT/OwningPtr.h"
23#include "llvm/Support/MemoryBuffer.h"
24#include "llvm/Support/raw_ostream.h"
25using namespace clang;
26
27//===----------------------------------------------------------------------===//
28// Custom Actions
29//===----------------------------------------------------------------------===//
30
31ASTConsumer *InitOnlyAction::CreateASTConsumer(CompilerInstance &CI,
32                                               StringRef InFile) {
33  return new ASTConsumer();
34}
35
36void InitOnlyAction::ExecuteAction() {
37}
38
39//===----------------------------------------------------------------------===//
40// AST Consumer Actions
41//===----------------------------------------------------------------------===//
42
43ASTConsumer *ASTPrintAction::CreateASTConsumer(CompilerInstance &CI,
44                                               StringRef InFile) {
45  if (raw_ostream *OS = CI.createDefaultOutputFile(false, InFile))
46    return CreateASTPrinter(OS);
47  return 0;
48}
49
50ASTConsumer *ASTDumpAction::CreateASTConsumer(CompilerInstance &CI,
51                                              StringRef InFile) {
52  return CreateASTDumper();
53}
54
55ASTConsumer *ASTDumpXMLAction::CreateASTConsumer(CompilerInstance &CI,
56                                                 StringRef InFile) {
57  raw_ostream *OS;
58  if (CI.getFrontendOpts().OutputFile.empty())
59    OS = &llvm::outs();
60  else
61    OS = CI.createDefaultOutputFile(false, InFile);
62  if (!OS) return 0;
63  return CreateASTDumperXML(*OS);
64}
65
66ASTConsumer *ASTViewAction::CreateASTConsumer(CompilerInstance &CI,
67                                              StringRef InFile) {
68  return CreateASTViewer();
69}
70
71ASTConsumer *DeclContextPrintAction::CreateASTConsumer(CompilerInstance &CI,
72                                                       StringRef InFile) {
73  return CreateDeclContextPrinter();
74}
75
76ASTConsumer *GeneratePCHAction::CreateASTConsumer(CompilerInstance &CI,
77                                                  StringRef InFile) {
78  std::string Sysroot;
79  std::string OutputFile;
80  raw_ostream *OS = 0;
81  bool Chaining;
82  if (ComputeASTConsumerArguments(CI, InFile, Sysroot, OutputFile, OS,
83                                  Chaining))
84    return 0;
85
86  if (!CI.getFrontendOpts().RelocatablePCH)
87    Sysroot.clear();
88  return new PCHGenerator(CI.getPreprocessor(), OutputFile, Chaining, Sysroot,
89                          OS);
90}
91
92bool GeneratePCHAction::ComputeASTConsumerArguments(CompilerInstance &CI,
93                                                    StringRef InFile,
94                                                    std::string &Sysroot,
95                                                    std::string &OutputFile,
96                                                    raw_ostream *&OS,
97                                                    bool &Chaining) {
98  Sysroot = CI.getHeaderSearchOpts().Sysroot;
99  if (CI.getFrontendOpts().RelocatablePCH && Sysroot.empty()) {
100    CI.getDiagnostics().Report(diag::err_relocatable_without_isysroot);
101    return true;
102  }
103
104  // We use createOutputFile here because this is exposed via libclang, and we
105  // must disable the RemoveFileOnSignal behavior.
106  // We use a temporary to avoid race conditions.
107  OS = CI.createOutputFile(CI.getFrontendOpts().OutputFile, /*Binary=*/true,
108                           /*RemoveFileOnSignal=*/false, InFile,
109                           /*Extension=*/"", /*useTemporary=*/true);
110  if (!OS)
111    return true;
112
113  OutputFile = CI.getFrontendOpts().OutputFile;
114  Chaining = CI.getInvocation().getFrontendOpts().ChainedPCH &&
115             !CI.getPreprocessorOpts().ImplicitPCHInclude.empty();
116  return false;
117}
118
119ASTConsumer *SyntaxOnlyAction::CreateASTConsumer(CompilerInstance &CI,
120                                                 StringRef InFile) {
121  return new ASTConsumer();
122}
123
124//===----------------------------------------------------------------------===//
125// Preprocessor Actions
126//===----------------------------------------------------------------------===//
127
128void DumpRawTokensAction::ExecuteAction() {
129  Preprocessor &PP = getCompilerInstance().getPreprocessor();
130  SourceManager &SM = PP.getSourceManager();
131
132  // Start lexing the specified input file.
133  const llvm::MemoryBuffer *FromFile = SM.getBuffer(SM.getMainFileID());
134  Lexer RawLex(SM.getMainFileID(), FromFile, SM, PP.getLangOptions());
135  RawLex.SetKeepWhitespaceMode(true);
136
137  Token RawTok;
138  RawLex.LexFromRawLexer(RawTok);
139  while (RawTok.isNot(tok::eof)) {
140    PP.DumpToken(RawTok, true);
141    llvm::errs() << "\n";
142    RawLex.LexFromRawLexer(RawTok);
143  }
144}
145
146void DumpTokensAction::ExecuteAction() {
147  Preprocessor &PP = getCompilerInstance().getPreprocessor();
148  // Start preprocessing the specified input file.
149  Token Tok;
150  PP.EnterMainSourceFile();
151  do {
152    PP.Lex(Tok);
153    PP.DumpToken(Tok, true);
154    llvm::errs() << "\n";
155  } while (Tok.isNot(tok::eof));
156}
157
158void GeneratePTHAction::ExecuteAction() {
159  CompilerInstance &CI = getCompilerInstance();
160  if (CI.getFrontendOpts().OutputFile.empty() ||
161      CI.getFrontendOpts().OutputFile == "-") {
162    // FIXME: Don't fail this way.
163    // FIXME: Verify that we can actually seek in the given file.
164    llvm::report_fatal_error("PTH requires a seekable file for output!");
165  }
166  llvm::raw_fd_ostream *OS =
167    CI.createDefaultOutputFile(true, getCurrentFile());
168  if (!OS) return;
169
170  CacheTokens(CI.getPreprocessor(), OS);
171}
172
173void PreprocessOnlyAction::ExecuteAction() {
174  Preprocessor &PP = getCompilerInstance().getPreprocessor();
175
176  // Ignore unknown pragmas.
177  PP.AddPragmaHandler(new EmptyPragmaHandler());
178
179  Token Tok;
180  // Start parsing the specified input file.
181  PP.EnterMainSourceFile();
182  do {
183    PP.Lex(Tok);
184  } while (Tok.isNot(tok::eof));
185}
186
187void PrintPreprocessedAction::ExecuteAction() {
188  CompilerInstance &CI = getCompilerInstance();
189  // Output file needs to be set to 'Binary', to avoid converting Unix style
190  // line feeds (<LF>) to Microsoft style line feeds (<CR><LF>).
191  raw_ostream *OS = CI.createDefaultOutputFile(true, getCurrentFile());
192  if (!OS) return;
193
194  DoPrintPreprocessedInput(CI.getPreprocessor(), OS,
195                           CI.getPreprocessorOutputOpts());
196}
197
198void PrintPreambleAction::ExecuteAction() {
199  switch (getCurrentFileKind()) {
200  case IK_C:
201  case IK_CXX:
202  case IK_ObjC:
203  case IK_ObjCXX:
204  case IK_OpenCL:
205  case IK_CUDA:
206    break;
207
208  case IK_None:
209  case IK_Asm:
210  case IK_PreprocessedC:
211  case IK_PreprocessedCXX:
212  case IK_PreprocessedObjC:
213  case IK_PreprocessedObjCXX:
214  case IK_AST:
215  case IK_LLVM_IR:
216    // We can't do anything with these.
217    return;
218  }
219
220  CompilerInstance &CI = getCompilerInstance();
221  llvm::MemoryBuffer *Buffer
222      = CI.getFileManager().getBufferForFile(getCurrentFile());
223  if (Buffer) {
224    unsigned Preamble = Lexer::ComputePreamble(Buffer, CI.getLangOpts()).first;
225    llvm::outs().write(Buffer->getBufferStart(), Preamble);
226    delete Buffer;
227  }
228}
229