//===- ToolOutputFile.h - Output files for compiler-like tools --*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines the ToolOutputFile class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_TOOLOUTPUTFILE_H
#define LLVM_SUPPORT_TOOLOUTPUTFILE_H
#include "llvm/Support/raw_ostream.h"
#include <optional>
namespace llvm {
/// This class contains a raw_fd_ostream and adds a few extra features commonly
/// needed for compiler-like tool output files:
/// - The file is automatically deleted if the process is killed.
/// - The file is automatically deleted when the ToolOutputFile
/// object is destroyed unless the client calls keep().
class ToolOutputFile {
/// This class is declared before the raw_fd_ostream so that it is constructed
/// before the raw_fd_ostream is constructed and destructed after the
/// raw_fd_ostream is destructed. It installs cleanups in its constructor and
/// uninstalls them in its destructor.
class CleanupInstaller {
public:
/// The name of the file.
std::string Filename;
/// The flag which indicates whether we should not delete the file.
bool Keep;
StringRef getFilename() { return Filename; }
explicit CleanupInstaller(StringRef Filename);
~CleanupInstaller();
} Installer;
/// Storage for the stream, if we're owning our own stream. This is
/// intentionally declared after Installer.
std::optional<raw_fd_ostream> OSHolder;
/// The actual stream to use.
raw_fd_ostream *OS;
public:
/// This constructor's arguments are passed to raw_fd_ostream's
/// constructor.
ToolOutputFile(StringRef Filename, std::error_code &EC,
sys::fs::OpenFlags Flags);
ToolOutputFile(StringRef Filename, int FD);
/// Return the contained raw_fd_ostream.
raw_fd_ostream &os() { return *OS; }
/// Return the filename initialized with.
StringRef getFilename() { return Installer.getFilename(); }
/// Indicate that the tool's job wrt this output file has been successful and
/// the file should not be deleted.
void keep() { Installer.Keep = true; }
const std::string &outputFilename() { return Installer.Filename; }
};
} // end llvm namespace
#endif