FrontendActions.cpp revision e6ec11aa15c7104d57009c6e036bf4ae29c35fb2 
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                                               llvm::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                                               llvm::StringRef InFile) {
45  if (llvm::raw_ostream *OS = CI.createDefaultOutputFile(false, InFile))
46    return CreateASTPrinter(OS);
47  return 0;
48}
49
50ASTConsumer *ASTDumpAction::CreateASTConsumer(CompilerInstance &CI,
51                                              llvm::StringRef InFile) {
52  return CreateASTDumper();
53}
54
55ASTConsumer *ASTDumpXMLAction::CreateASTConsumer(CompilerInstance &CI,
56                                                 llvm::StringRef InFile) {
57  llvm::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                                              llvm::StringRef InFile) {
68  return CreateASTViewer();
69}
70
71ASTConsumer *DeclContextPrintAction::CreateASTConsumer(CompilerInstance &CI,
72                                                       llvm::StringRef InFile) {
73  return CreateDeclContextPrinter();
74}
75
76ASTConsumer *GeneratePCHAction::CreateASTConsumer(CompilerInstance &CI,
77                                                  llvm::StringRef InFile) {
78  std::string Sysroot;
79  std::string OutputFile;
80  llvm::raw_ostream *OS = 0;
81  bool Chaining;
82  if (ComputeASTConsumerArguments(CI, InFile, Sysroot, OutputFile, OS, Chaining))
83    return 0;
84
85  const char *isysroot = CI.getFrontendOpts().RelocatablePCH ?
86                             Sysroot.c_str() : 0;
87  return new PCHGenerator(CI.getPreprocessor(), OutputFile, Chaining, isysroot, OS);
88}
89
90bool GeneratePCHAction::ComputeASTConsumerArguments(CompilerInstance &CI,
91                                                    llvm::StringRef InFile,
92                                                    std::string &Sysroot,
93                                                    std::string &OutputFile,
94                                                    llvm::raw_ostream *&OS,
95                                                    bool &Chaining) {
96  Sysroot = CI.getHeaderSearchOpts().Sysroot;
97  if (CI.getFrontendOpts().RelocatablePCH && Sysroot.empty()) {
98    CI.getDiagnostics().Report(diag::err_relocatable_without_isysroot);
99    return true;
100  }
101
102  // We use createOutputFile here because this is exposed via libclang, and we
103  // must disable the RemoveFileOnSignal behavior.
104  OS = CI.createOutputFile(CI.getFrontendOpts().OutputFile, /*Binary=*/true,
105                           /*RemoveFileOnSignal=*/false, InFile);
106  if (!OS)
107    return true;
108
109  OutputFile = CI.getFrontendOpts().OutputFile;
110  Chaining = CI.getInvocation().getFrontendOpts().ChainedPCH &&
111             !CI.getPreprocessorOpts().ImplicitPCHInclude.empty();
112  return false;
113}
114
115ASTConsumer *SyntaxOnlyAction::CreateASTConsumer(CompilerInstance &CI,
116                                                 llvm::StringRef InFile) {
117  return new ASTConsumer();
118}
119
120//===----------------------------------------------------------------------===//
121// Preprocessor Actions
122//===----------------------------------------------------------------------===//
123
124void DumpRawTokensAction::ExecuteAction() {
125  Preprocessor &PP = getCompilerInstance().getPreprocessor();
126  SourceManager &SM = PP.getSourceManager();
127
128  // Start lexing the specified input file.
129  const llvm::MemoryBuffer *FromFile = SM.getBuffer(SM.getMainFileID());
130  Lexer RawLex(SM.getMainFileID(), FromFile, SM, PP.getLangOptions());
131  RawLex.SetKeepWhitespaceMode(true);
132
133  Token RawTok;
134  RawLex.LexFromRawLexer(RawTok);
135  while (RawTok.isNot(tok::eof)) {
136    PP.DumpToken(RawTok, true);
137    llvm::errs() << "\n";
138    RawLex.LexFromRawLexer(RawTok);
139  }
140}
141
142void DumpTokensAction::ExecuteAction() {
143  Preprocessor &PP = getCompilerInstance().getPreprocessor();
144  // Start preprocessing the specified input file.
145  Token Tok;
146  PP.EnterMainSourceFile();
147  do {
148    PP.Lex(Tok);
149    PP.DumpToken(Tok, true);
150    llvm::errs() << "\n";
151  } while (Tok.isNot(tok::eof));
152}
153
154void GeneratePTHAction::ExecuteAction() {
155  CompilerInstance &CI = getCompilerInstance();
156  if (CI.getFrontendOpts().OutputFile.empty() ||
157      CI.getFrontendOpts().OutputFile == "-") {
158    // FIXME: Don't fail this way.
159    // FIXME: Verify that we can actually seek in the given file.
160    llvm::report_fatal_error("PTH requires a seekable file for output!");
161  }
162  llvm::raw_fd_ostream *OS =
163    CI.createDefaultOutputFile(true, getCurrentFile());
164  if (!OS) return;
165
166  CacheTokens(CI.getPreprocessor(), OS);
167}
168
169void PreprocessOnlyAction::ExecuteAction() {
170  Preprocessor &PP = getCompilerInstance().getPreprocessor();
171
172  // Ignore unknown pragmas.
173  PP.AddPragmaHandler(new EmptyPragmaHandler());
174
175  Token Tok;
176  // Start parsing the specified input file.
177  PP.EnterMainSourceFile();
178  do {
179    PP.Lex(Tok);
180  } while (Tok.isNot(tok::eof));
181}
182
183void PrintPreprocessedAction::ExecuteAction() {
184  CompilerInstance &CI = getCompilerInstance();
185  // Output file needs to be set to 'Binary', to avoid converting Unix style
186  // line feeds (<LF>) to Microsoft style line feeds (<CR><LF>).
187  llvm::raw_ostream *OS = CI.createDefaultOutputFile(true, getCurrentFile());
188  if (!OS) return;
189
190  DoPrintPreprocessedInput(CI.getPreprocessor(), OS,
191                           CI.getPreprocessorOutputOpts());
192}
193
194void PrintPreambleAction::ExecuteAction() {
195  switch (getCurrentFileKind()) {
196  case IK_C:
197  case IK_CXX:
198  case IK_ObjC:
199  case IK_ObjCXX:
200  case IK_OpenCL:
201  case IK_CUDA:
202    break;
203
204  case IK_None:
205  case IK_Asm:
206  case IK_PreprocessedC:
207  case IK_PreprocessedCXX:
208  case IK_PreprocessedObjC:
209  case IK_PreprocessedObjCXX:
210  case IK_AST:
211  case IK_LLVM_IR:
212    // We can't do anything with these.
213    return;
214  }
215
216  CompilerInstance &CI = getCompilerInstance();
217  llvm::MemoryBuffer *Buffer
218      = CI.getFileManager().getBufferForFile(getCurrentFile());
219  if (Buffer) {
220    unsigned Preamble = Lexer::ComputePreamble(Buffer).first;
221    llvm::outs().write(Buffer->getBufferStart(), Preamble);
222    delete Buffer;
223  }
224}
225