FrontendActions.cpp revision f35142413974e9dfe2c5f202084db4bd1c2073e9 
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 *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 *ASTDumpXMLAction::CreateASTConsumer(CompilerInstance &CI,
63                                                 llvm::StringRef InFile) {
64  llvm::raw_ostream *OS;
65  if (CI.getFrontendOpts().OutputFile.empty())
66    OS = &llvm::outs();
67  else
68    OS = CI.createDefaultOutputFile(false, InFile);
69  if (!OS) return 0;
70  return CreateASTDumperXML(*OS);
71}
72
73ASTConsumer *ASTViewAction::CreateASTConsumer(CompilerInstance &CI,
74                                              llvm::StringRef InFile) {
75  return CreateASTViewer();
76}
77
78ASTConsumer *DeclContextPrintAction::CreateASTConsumer(CompilerInstance &CI,
79                                                       llvm::StringRef InFile) {
80  return CreateDeclContextPrinter();
81}
82
83ASTConsumer *GeneratePCHAction::CreateASTConsumer(CompilerInstance &CI,
84                                                  llvm::StringRef InFile) {
85  std::string Sysroot;
86  llvm::raw_ostream *OS = 0;
87  bool Chaining;
88  if (ComputeASTConsumerArguments(CI, InFile, Sysroot, OS, Chaining))
89    return 0;
90
91  const char *isysroot = CI.getFrontendOpts().RelocatablePCH ?
92                             Sysroot.c_str() : 0;
93  return new PCHGenerator(CI.getPreprocessor(), Chaining, isysroot, OS);
94}
95
96bool GeneratePCHAction::ComputeASTConsumerArguments(CompilerInstance &CI,
97                                                    llvm::StringRef InFile,
98                                                    std::string &Sysroot,
99                                                    llvm::raw_ostream *&OS,
100                                                    bool &Chaining) {
101  Sysroot = CI.getHeaderSearchOpts().Sysroot;
102  if (CI.getFrontendOpts().RelocatablePCH && Sysroot.empty()) {
103    CI.getDiagnostics().Report(diag::err_relocatable_without_isysroot);
104    return true;
105  }
106
107  OS = CI.createDefaultOutputFile(true, InFile);
108  if (!OS)
109    return true;
110
111  Chaining = CI.getInvocation().getFrontendOpts().ChainedPCH &&
112             !CI.getPreprocessorOpts().ImplicitPCHInclude.empty();
113  return false;
114}
115
116ASTConsumer *InheritanceViewAction::CreateASTConsumer(CompilerInstance &CI,
117                                                      llvm::StringRef InFile) {
118  return CreateInheritanceViewer(CI.getFrontendOpts().ViewClassInheritance);
119}
120
121ASTConsumer *SyntaxOnlyAction::CreateASTConsumer(CompilerInstance &CI,
122                                                 llvm::StringRef InFile) {
123  return new ASTConsumer();
124}
125
126//===----------------------------------------------------------------------===//
127// Preprocessor Actions
128//===----------------------------------------------------------------------===//
129
130void DumpRawTokensAction::ExecuteAction() {
131  Preprocessor &PP = getCompilerInstance().getPreprocessor();
132  SourceManager &SM = PP.getSourceManager();
133
134  // Start lexing the specified input file.
135  const llvm::MemoryBuffer *FromFile = SM.getBuffer(SM.getMainFileID());
136  Lexer RawLex(SM.getMainFileID(), FromFile, SM, PP.getLangOptions());
137  RawLex.SetKeepWhitespaceMode(true);
138
139  Token RawTok;
140  RawLex.LexFromRawLexer(RawTok);
141  while (RawTok.isNot(tok::eof)) {
142    PP.DumpToken(RawTok, true);
143    llvm::errs() << "\n";
144    RawLex.LexFromRawLexer(RawTok);
145  }
146}
147
148void DumpTokensAction::ExecuteAction() {
149  Preprocessor &PP = getCompilerInstance().getPreprocessor();
150  // Start preprocessing the specified input file.
151  Token Tok;
152  PP.EnterMainSourceFile();
153  do {
154    PP.Lex(Tok);
155    PP.DumpToken(Tok, true);
156    llvm::errs() << "\n";
157  } while (Tok.isNot(tok::eof));
158}
159
160void GeneratePTHAction::ExecuteAction() {
161  CompilerInstance &CI = getCompilerInstance();
162  if (CI.getFrontendOpts().OutputFile.empty() ||
163      CI.getFrontendOpts().OutputFile == "-") {
164    // FIXME: Don't fail this way.
165    // FIXME: Verify that we can actually seek in the given file.
166    llvm::report_fatal_error("PTH requires a seekable file for output!");
167  }
168  llvm::raw_fd_ostream *OS =
169    CI.createDefaultOutputFile(true, getCurrentFile());
170  if (!OS) return;
171
172  CacheTokens(CI.getPreprocessor(), OS);
173}
174
175void PreprocessOnlyAction::ExecuteAction() {
176  Preprocessor &PP = getCompilerInstance().getPreprocessor();
177
178  // Ignore unknown pragmas.
179  PP.AddPragmaHandler(new EmptyPragmaHandler());
180
181  Token Tok;
182  // Start parsing the specified input file.
183  PP.EnterMainSourceFile();
184  do {
185    PP.Lex(Tok);
186  } while (Tok.isNot(tok::eof));
187}
188
189void PrintPreprocessedAction::ExecuteAction() {
190  CompilerInstance &CI = getCompilerInstance();
191  // Output file needs to be set to 'Binary', to avoid converting Unix style
192  // line feeds (<LF>) to Microsoft style line feeds (<CR><LF>).
193  llvm::raw_ostream *OS = CI.createDefaultOutputFile(true, getCurrentFile());
194  if (!OS) return;
195
196  DoPrintPreprocessedInput(CI.getPreprocessor(), OS,
197                           CI.getPreprocessorOutputOpts());
198}
199
200void PrintPreambleAction::ExecuteAction() {
201  switch (getCurrentFileKind()) {
202  case IK_C:
203  case IK_CXX:
204  case IK_ObjC:
205  case IK_ObjCXX:
206  case IK_OpenCL:
207    break;
208
209  case IK_None:
210  case IK_Asm:
211  case IK_PreprocessedC:
212  case IK_PreprocessedCXX:
213  case IK_PreprocessedObjC:
214  case IK_PreprocessedObjCXX:
215  case IK_AST:
216  case IK_LLVM_IR:
217    // We can't do anything with these.
218    return;
219  }
220
221  CompilerInstance &CI = getCompilerInstance();
222  llvm::MemoryBuffer *Buffer
223      = CI.getFileManager().getBufferForFile(getCurrentFile());
224  if (Buffer) {
225    unsigned Preamble = Lexer::ComputePreamble(Buffer).first;
226    llvm::outs().write(Buffer->getBufferStart(), Preamble);
227    delete Buffer;
228  }
229}
230