lib/Rewrite/FrontendActions.cpp

//===--- FrontendActions.cpp ----------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "clang/Rewrite/FrontendActions.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Parse/Parser.h"
#include "clang/Basic/FileManager.h"
#include "clang/Frontend/FrontendActions.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/FrontendDiagnostic.h"
#include "clang/Frontend/Utils.h"
#include "clang/Rewrite/ASTConsumers.h"
#include "clang/Rewrite/FixItRewriter.h"
#include "clang/Rewrite/Rewriters.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/FileSystem.h"

// FIXME: This is terrible, we need this for ::close.
#if !defined(_MSC_VER)
#include <unistd.h>
#else
#include <io.h>
#endif

using namespace clang;

//===----------------------------------------------------------------------===//
// AST Consumer Actions
//===----------------------------------------------------------------------===//

ASTConsumer *HTMLPrintAction::CreateASTConsumer(CompilerInstance &CI,
                                                StringRef InFile) {
  if (raw_ostream *OS = CI.createDefaultOutputFile(false, InFile))
    return CreateHTMLPrinter(OS, CI.getPreprocessor());
  return 0;
}

FixItAction::FixItAction() {}
FixItAction::~FixItAction() {}

ASTConsumer *FixItAction::CreateASTConsumer(CompilerInstance &CI,
                                            StringRef InFile) {
  return new ASTConsumer();
}

namespace {
class FixItRewriteInPlace : public FixItOptions {
public:
  std::string RewriteFilename(const std::string &Filename) { return Filename; }
};

class FixItActionSuffixInserter : public FixItOptions {
  std::string NewSuffix;

public:
  FixItActionSuffixInserter(std::string NewSuffix, bool FixWhatYouCan)
    : NewSuffix(NewSuffix) {
      this->FixWhatYouCan = FixWhatYouCan;
  }

  std::string RewriteFilename(const std::string &Filename) {
    llvm::SmallString<128> Path(Filename);
    llvm::sys::path::replace_extension(Path,
      NewSuffix + llvm::sys::path::extension(Path));
    return Path.str();
  }
};

class FixItRewriteToTemp : public FixItOptions {
public:
  std::string RewriteFilename(const std::string &Filename) {
    llvm::SmallString<128> Path;
    Path = llvm::sys::path::filename(Filename);
    Path += "-%%%%%%%%";
    Path += llvm::sys::path::extension(Filename);
    int fd;
    llvm::SmallString<128> NewPath;
    if (llvm::sys::fs::unique_file(Path.str(), fd, NewPath)
          == llvm::errc::success)
      ::close(fd);
    return NewPath.str();
  }
};
} // end anonymous namespace

bool FixItAction::BeginSourceFileAction(CompilerInstance &CI,
                                        StringRef Filename) {
  const FrontendOptions &FEOpts = getCompilerInstance().getFrontendOpts();
  if (!FEOpts.FixItSuffix.empty()) {
    FixItOpts.reset(new FixItActionSuffixInserter(FEOpts.FixItSuffix,
                                                  FEOpts.FixWhatYouCan));
  } else {
    FixItOpts.reset(new FixItRewriteInPlace);
    FixItOpts->FixWhatYouCan = FEOpts.FixWhatYouCan;
  }
  Rewriter.reset(new FixItRewriter(CI.getDiagnostics(), CI.getSourceManager(),
                                   CI.getLangOpts(), FixItOpts.get()));
  return true;
}

void FixItAction::EndSourceFileAction() {
  // Otherwise rewrite all files.
  Rewriter->WriteFixedFiles();
}

bool FixItRecompile::BeginInvocation(CompilerInstance &CI) {

  std::vector<std::pair<std::string, std::string> > RewrittenFiles;
  bool err = false;
  {
    const FrontendOptions &FEOpts = CI.getFrontendOpts();
    llvm::OwningPtr<FrontendAction> FixAction(new SyntaxOnlyAction());
    FixAction->BeginSourceFile(CI, FEOpts.Inputs[0]);

    llvm::OwningPtr<FixItOptions> FixItOpts;
    if (FEOpts.FixToTemporaries)
      FixItOpts.reset(new FixItRewriteToTemp());
    else
      FixItOpts.reset(new FixItRewriteInPlace());
    FixItOpts->Silent = true;
    FixItOpts->FixWhatYouCan = FEOpts.FixWhatYouCan;
    FixItOpts->FixOnlyWarnings = FEOpts.FixOnlyWarnings;
    FixItRewriter Rewriter(CI.getDiagnostics(), CI.getSourceManager(),
                           CI.getLangOpts(), FixItOpts.get());
    FixAction->Execute();

    err = Rewriter.WriteFixedFiles(&RewrittenFiles);
  
    FixAction->EndSourceFile();
    CI.setSourceManager(0);
    CI.setFileManager(0);
  }
  if (err)
    return false;
  CI.getDiagnosticClient().clear();

  PreprocessorOptions &PPOpts = CI.getPreprocessorOpts();
  PPOpts.RemappedFiles.insert(PPOpts.RemappedFiles.end(),
                              RewrittenFiles.begin(), RewrittenFiles.end());
  PPOpts.RemappedFilesKeepOriginalName = false;

  return true;
}

//===----------------------------------------------------------------------===//
// Preprocessor Actions
//===----------------------------------------------------------------------===//

ASTConsumer *RewriteObjCAction::CreateASTConsumer(CompilerInstance &CI,
                                                  StringRef InFile) {
  if (raw_ostream *OS = CI.createDefaultOutputFile(false, InFile, "cpp"))
    return CreateObjCRewriter(InFile, OS,
                              CI.getDiagnostics(), CI.getLangOpts(),
                              CI.getDiagnosticOpts().NoRewriteMacros);
  return 0;
}

void RewriteMacrosAction::ExecuteAction() {
  CompilerInstance &CI = getCompilerInstance();
  raw_ostream *OS = CI.createDefaultOutputFile(true, getCurrentFile());
  if (!OS) return;

  RewriteMacrosInInput(CI.getPreprocessor(), OS);
}

void RewriteTestAction::ExecuteAction() {
  CompilerInstance &CI = getCompilerInstance();
  raw_ostream *OS = CI.createDefaultOutputFile(false, getCurrentFile());
  if (!OS) return;

  DoRewriteTest(CI.getPreprocessor(), OS);
}