FrontendActions.cpp revision 857281328fa824782bdd979c3bfdd97ecdbc1609 
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/PCHWriter.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 *ASTPrintXMLAction::CreateASTConsumer(CompilerInstance &CI,
51                                                  llvm::StringRef InFile) {
52  if (llvm::raw_ostream *OS = CI.createDefaultOutputFile(false, InFile, "xml"))
53    return CreateASTPrinterXML(OS);
54  return 0;
55}
56
57ASTConsumer *ASTDumpAction::CreateASTConsumer(CompilerInstance &CI,
58                                              llvm::StringRef InFile) {
59  return CreateASTDumper();
60}
61
62ASTConsumer *ASTViewAction::CreateASTConsumer(CompilerInstance &CI,
63                                              llvm::StringRef InFile) {
64  return CreateASTViewer();
65}
66
67ASTConsumer *DeclContextPrintAction::CreateASTConsumer(CompilerInstance &CI,
68                                                       llvm::StringRef InFile) {
69  return CreateDeclContextPrinter();
70}
71
72ASTConsumer *GeneratePCHAction::CreateASTConsumer(CompilerInstance &CI,
73                                                  llvm::StringRef InFile) {
74  std::string Sysroot;
75  llvm::raw_ostream *OS = 0;
76  bool Chaining;
77  if (ComputeASTConsumerArguments(CI, InFile, Sysroot, OS, Chaining))
78    return 0;
79
80  const char *isysroot = CI.getFrontendOpts().RelocatablePCH ?
81                             Sysroot.c_str() : 0;
82  return new PCHGenerator(CI.getPreprocessor(), Chaining, isysroot, OS);
83}
84
85bool GeneratePCHAction::ComputeASTConsumerArguments(CompilerInstance &CI,
86                                                    llvm::StringRef InFile,
87                                                    std::string &Sysroot,
88                                                    llvm::raw_ostream *&OS,
89                                                    bool &Chaining) {
90  Sysroot = CI.getHeaderSearchOpts().Sysroot;
91  if (CI.getFrontendOpts().RelocatablePCH && Sysroot.empty()) {
92    CI.getDiagnostics().Report(diag::err_relocatable_without_isysroot);
93    return true;
94  }
95
96  OS = CI.createDefaultOutputFile(true, InFile);
97  if (!OS)
98    return true;
99
100  Chaining = CI.getInvocation().getFrontendOpts().ChainedPCH &&
101             !CI.getPreprocessorOpts().ImplicitPCHInclude.empty();
102  return false;
103}
104
105ASTConsumer *InheritanceViewAction::CreateASTConsumer(CompilerInstance &CI,
106                                                      llvm::StringRef InFile) {
107  return CreateInheritanceViewer(CI.getFrontendOpts().ViewClassInheritance);
108}
109
110ASTConsumer *SyntaxOnlyAction::CreateASTConsumer(CompilerInstance &CI,
111                                                 llvm::StringRef InFile) {
112  return new ASTConsumer();
113}
114
115//===----------------------------------------------------------------------===//
116// Preprocessor Actions
117//===----------------------------------------------------------------------===//
118
119void DumpRawTokensAction::ExecuteAction() {
120  Preprocessor &PP = getCompilerInstance().getPreprocessor();
121  SourceManager &SM = PP.getSourceManager();
122
123  // Start lexing the specified input file.
124  const llvm::MemoryBuffer *FromFile = SM.getBuffer(SM.getMainFileID());
125  Lexer RawLex(SM.getMainFileID(), FromFile, SM, PP.getLangOptions());
126  RawLex.SetKeepWhitespaceMode(true);
127
128  Token RawTok;
129  RawLex.LexFromRawLexer(RawTok);
130  while (RawTok.isNot(tok::eof)) {
131    PP.DumpToken(RawTok, true);
132    llvm::errs() << "\n";
133    RawLex.LexFromRawLexer(RawTok);
134  }
135}
136
137void DumpTokensAction::ExecuteAction() {
138  Preprocessor &PP = getCompilerInstance().getPreprocessor();
139  // Start preprocessing the specified input file.
140  Token Tok;
141  PP.EnterMainSourceFile();
142  do {
143    PP.Lex(Tok);
144    PP.DumpToken(Tok, true);
145    llvm::errs() << "\n";
146  } while (Tok.isNot(tok::eof));
147}
148
149void GeneratePTHAction::ExecuteAction() {
150  CompilerInstance &CI = getCompilerInstance();
151  if (CI.getFrontendOpts().OutputFile.empty() ||
152      CI.getFrontendOpts().OutputFile == "-") {
153    // FIXME: Don't fail this way.
154    // FIXME: Verify that we can actually seek in the given file.
155    llvm::report_fatal_error("PTH requires a seekable file for output!");
156  }
157  llvm::raw_fd_ostream *OS =
158    CI.createDefaultOutputFile(true, getCurrentFile());
159  if (!OS) return;
160
161  CacheTokens(CI.getPreprocessor(), OS);
162}
163
164void PreprocessOnlyAction::ExecuteAction() {
165  Preprocessor &PP = getCompilerInstance().getPreprocessor();
166
167  // Ignore unknown pragmas.
168  PP.AddPragmaHandler(new EmptyPragmaHandler());
169
170  Token Tok;
171  // Start parsing the specified input file.
172  PP.EnterMainSourceFile();
173  do {
174    PP.Lex(Tok);
175  } while (Tok.isNot(tok::eof));
176}
177
178void PrintPreprocessedAction::ExecuteAction() {
179  CompilerInstance &CI = getCompilerInstance();
180  // Output file needs to be set to 'Binary', to avoid converting Unix style
181  // line feeds (<LF>) to Microsoft style line feeds (<CR><LF>).
182  llvm::raw_ostream *OS = CI.createDefaultOutputFile(true, getCurrentFile());
183  if (!OS) return;
184
185  DoPrintPreprocessedInput(CI.getPreprocessor(), OS,
186                           CI.getPreprocessorOutputOpts());
187}
188
189void PrintPreambleAction::ExecuteAction() {
190  switch (getCurrentFileKind()) {
191  case IK_C:
192  case IK_CXX:
193  case IK_ObjC:
194  case IK_ObjCXX:
195  case IK_OpenCL:
196    break;
197
198  case IK_None:
199  case IK_Asm:
200  case IK_PreprocessedC:
201  case IK_PreprocessedCXX:
202  case IK_PreprocessedObjC:
203  case IK_PreprocessedObjCXX:
204  case IK_AST:
205  case IK_LLVM_IR:
206    // We can't do anything with these.
207    return;
208  }
209
210  llvm::MemoryBuffer *Buffer = llvm::MemoryBuffer::getFile(getCurrentFile());
211  if (Buffer) {
212    unsigned Preamble = Lexer::ComputePreamble(Buffer).first;
213    llvm::outs().write(Buffer->getBufferStart(), Preamble);
214    delete Buffer;
215  }
216}
217