FrontendActions.cpp revision d2536a604f59a3cca491f175bf1e49eeca49163b 
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"
25#include "llvm/Support/system_error.h"
26
27using namespace clang;
28
29//===----------------------------------------------------------------------===//
30// Custom Actions
31//===----------------------------------------------------------------------===//
32
33ASTConsumer *InitOnlyAction::CreateASTConsumer(CompilerInstance &CI,
34                                               StringRef InFile) {
35  return new ASTConsumer();
36}
37
38void InitOnlyAction::ExecuteAction() {
39}
40
41//===----------------------------------------------------------------------===//
42// AST Consumer Actions
43//===----------------------------------------------------------------------===//
44
45ASTConsumer *ASTPrintAction::CreateASTConsumer(CompilerInstance &CI,
46                                               StringRef InFile) {
47  if (raw_ostream *OS = CI.createDefaultOutputFile(false, InFile))
48    return CreateASTPrinter(OS);
49  return 0;
50}
51
52ASTConsumer *ASTDumpAction::CreateASTConsumer(CompilerInstance &CI,
53                                              StringRef InFile) {
54  return CreateASTDumper();
55}
56
57ASTConsumer *ASTDumpXMLAction::CreateASTConsumer(CompilerInstance &CI,
58                                                 StringRef InFile) {
59  raw_ostream *OS;
60  if (CI.getFrontendOpts().OutputFile.empty())
61    OS = &llvm::outs();
62  else
63    OS = CI.createDefaultOutputFile(false, InFile);
64  if (!OS) return 0;
65  return CreateASTDumperXML(*OS);
66}
67
68ASTConsumer *ASTViewAction::CreateASTConsumer(CompilerInstance &CI,
69                                              StringRef InFile) {
70  return CreateASTViewer();
71}
72
73ASTConsumer *DeclContextPrintAction::CreateASTConsumer(CompilerInstance &CI,
74                                                       StringRef InFile) {
75  return CreateDeclContextPrinter();
76}
77
78ASTConsumer *GeneratePCHAction::CreateASTConsumer(CompilerInstance &CI,
79                                                  StringRef InFile) {
80  std::string Sysroot;
81  std::string OutputFile;
82  raw_ostream *OS = 0;
83  if (ComputeASTConsumerArguments(CI, InFile, Sysroot, OutputFile, OS))
84    return 0;
85
86  if (!CI.getFrontendOpts().RelocatablePCH)
87    Sysroot.clear();
88  return new PCHGenerator(CI.getPreprocessor(), OutputFile, MakeModule,
89                          Sysroot, OS);
90}
91
92bool GeneratePCHAction::ComputeASTConsumerArguments(CompilerInstance &CI,
93                                                    StringRef InFile,
94                                                    std::string &Sysroot,
95                                                    std::string &OutputFile,
96                                                    raw_ostream *&OS) {
97  Sysroot = CI.getHeaderSearchOpts().Sysroot;
98  if (CI.getFrontendOpts().RelocatablePCH && Sysroot.empty()) {
99    CI.getDiagnostics().Report(diag::err_relocatable_without_isysroot);
100    return true;
101  }
102
103  // We use createOutputFile here because this is exposed via libclang, and we
104  // must disable the RemoveFileOnSignal behavior.
105  // We use a temporary to avoid race conditions.
106  OS = CI.createOutputFile(CI.getFrontendOpts().OutputFile, /*Binary=*/true,
107                           /*RemoveFileOnSignal=*/false, InFile,
108                           /*Extension=*/"", /*useTemporary=*/true);
109  if (!OS)
110    return true;
111
112  OutputFile = CI.getFrontendOpts().OutputFile;
113  return false;
114}
115
116ASTConsumer *SyntaxOnlyAction::CreateASTConsumer(CompilerInstance &CI,
117                                                 StringRef InFile) {
118  return new ASTConsumer();
119}
120
121//===----------------------------------------------------------------------===//
122// Preprocessor Actions
123//===----------------------------------------------------------------------===//
124
125void DumpRawTokensAction::ExecuteAction() {
126  Preprocessor &PP = getCompilerInstance().getPreprocessor();
127  SourceManager &SM = PP.getSourceManager();
128
129  // Start lexing the specified input file.
130  const llvm::MemoryBuffer *FromFile = SM.getBuffer(SM.getMainFileID());
131  Lexer RawLex(SM.getMainFileID(), FromFile, SM, PP.getLangOptions());
132  RawLex.SetKeepWhitespaceMode(true);
133
134  Token RawTok;
135  RawLex.LexFromRawLexer(RawTok);
136  while (RawTok.isNot(tok::eof)) {
137    PP.DumpToken(RawTok, true);
138    llvm::errs() << "\n";
139    RawLex.LexFromRawLexer(RawTok);
140  }
141}
142
143void DumpTokensAction::ExecuteAction() {
144  Preprocessor &PP = getCompilerInstance().getPreprocessor();
145  // Start preprocessing the specified input file.
146  Token Tok;
147  PP.EnterMainSourceFile();
148  do {
149    PP.Lex(Tok);
150    PP.DumpToken(Tok, true);
151    llvm::errs() << "\n";
152  } while (Tok.isNot(tok::eof));
153}
154
155void GeneratePTHAction::ExecuteAction() {
156  CompilerInstance &CI = getCompilerInstance();
157  if (CI.getFrontendOpts().OutputFile.empty() ||
158      CI.getFrontendOpts().OutputFile == "-") {
159    // FIXME: Don't fail this way.
160    // FIXME: Verify that we can actually seek in the given file.
161    llvm::report_fatal_error("PTH requires a seekable file for output!");
162  }
163  llvm::raw_fd_ostream *OS =
164    CI.createDefaultOutputFile(true, getCurrentFile());
165  if (!OS) return;
166
167  CacheTokens(CI.getPreprocessor(), OS);
168}
169
170void PreprocessOnlyAction::ExecuteAction() {
171  Preprocessor &PP = getCompilerInstance().getPreprocessor();
172
173  // Ignore unknown pragmas.
174  PP.AddPragmaHandler(new EmptyPragmaHandler());
175
176  Token Tok;
177  // Start parsing the specified input file.
178  PP.EnterMainSourceFile();
179  do {
180    PP.Lex(Tok);
181  } while (Tok.isNot(tok::eof));
182}
183
184void PrintPreprocessedAction::ExecuteAction() {
185  CompilerInstance &CI = getCompilerInstance();
186  // Output file may need to be set to 'Binary', to avoid converting Unix style
187  // line feeds (<LF>) to Microsoft style line feeds (<CR><LF>).
188  //
189  // Look to see what type of line endings the file uses. If there's a
190  // CRLF, then we won't open the file up in binary mode. If there is
191  // just an LF or CR, then we will open the file up in binary mode.
192  // In this fashion, the output format should match the input format, unless
193  // the input format has inconsistent line endings.
194  //
195  // This should be a relatively fast operation since most files won't have
196  // all of their source code on a single line. However, that is still a
197  // concern, so if we scan for too long, we'll just assume the file should
198  // be opened in binary mode.
199  bool BinaryMode = true;
200  bool InvalidFile = false;
201  const SourceManager& SM = CI.getSourceManager();
202  const llvm::MemoryBuffer *Buffer = SM.getBuffer(SM.getMainFileID(),
203                                                     &InvalidFile);
204  if (!InvalidFile) {
205    const char *cur = Buffer->getBufferStart();
206    const char *end = Buffer->getBufferEnd();
207    const char *next = (cur != end) ? cur + 1 : end;
208
209    // Limit ourselves to only scanning 256 characters into the source
210    // file.  This is mostly a sanity check in case the file has no
211    // newlines whatsoever.
212    if (end - cur > 256) end = cur + 256;
213
214    while (next < end) {
215      if (*cur == 0x0D) {  // CR
216        if (*next == 0x0A)  // CRLF
217          BinaryMode = false;
218
219        break;
220      } else if (*cur == 0x0A)  // LF
221        break;
222
223      ++cur, ++next;
224    }
225  }
226
227  raw_ostream *OS = CI.createDefaultOutputFile(BinaryMode, getCurrentFile());
228  if (!OS) return;
229
230  DoPrintPreprocessedInput(CI.getPreprocessor(), OS,
231                           CI.getPreprocessorOutputOpts());
232}
233
234void PrintPreambleAction::ExecuteAction() {
235  switch (getCurrentFileKind()) {
236  case IK_C:
237  case IK_CXX:
238  case IK_ObjC:
239  case IK_ObjCXX:
240  case IK_OpenCL:
241  case IK_CUDA:
242    break;
243
244  case IK_None:
245  case IK_Asm:
246  case IK_PreprocessedC:
247  case IK_PreprocessedCXX:
248  case IK_PreprocessedObjC:
249  case IK_PreprocessedObjCXX:
250  case IK_AST:
251  case IK_LLVM_IR:
252    // We can't do anything with these.
253    return;
254  }
255
256  CompilerInstance &CI = getCompilerInstance();
257  llvm::MemoryBuffer *Buffer
258      = CI.getFileManager().getBufferForFile(getCurrentFile());
259  if (Buffer) {
260    unsigned Preamble = Lexer::ComputePreamble(Buffer, CI.getLangOpts()).first;
261    llvm::outs().write(Buffer->getBufferStart(), Preamble);
262    delete Buffer;
263  }
264}
265