mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-23 03:02:36 +01:00
0d0270ebc8
Summary: If the output filename was specified as "-", the ToolOutputFile class would create a brand new raw_ostream object referring to the stdout. This patch changes it to reuse the llvm::outs() singleton. At the moment, this change should be "NFC", but it does enable other enhancements, like the automatic stdout/stderr synchronization as discussed on D80803. I've checked the history, and I did not find any indication that this class *has* to use a brand new stream object instead of outs() -- indeed, it is special-casing "-" in a number of places already, so this change fits the pattern pretty well. I suspect the main reason for the current state of affairs is that the class was originally introduced (r111595, in 2010) as a raw_fd_ostream subclass, which made any other solution impossible. Another potential benefit of this patch is that it makes it possible to move the raw_ostream class out of the business of special-casing "-" for stdout handling. That state of affairs does not seem appropriate because "-" is a valid filename (albeit hard to access with a lot of command line tools) on most systems. Handling "-" in ToolOutputFile seems more appropriate. To make this possible, this patch changes the return type of llvm::outs() and errs() to raw_fd_ostream&. Previously the functions were constructing objects of that type, but returning a generic raw_ostream reference. This makes it possible for new ToolOutputFile and other code to use raw_fd_ostream methods like error() on the outs() object. This does not seem like a bad thing (since stdout is a file descriptor which can be redirected to anywhere, it makes sense to ask it whether the writing was successful or if it supports seeking), and indeed a lot of code was already depending on this fact via the ToolOutputFile "back door". Reviewers: dblaikie, JDevlieghere, MaskRay, jhenderson Subscribers: hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D81078
60 lines
1.8 KiB
C++
60 lines
1.8 KiB
C++
//===--- ToolOutputFile.cpp - Implement the ToolOutputFile class --------===//
|
|
//
|
|
// 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 implements the ToolOutputFile class.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Support/ToolOutputFile.h"
|
|
#include "llvm/Support/FileSystem.h"
|
|
#include "llvm/Support/Signals.h"
|
|
using namespace llvm;
|
|
|
|
static bool isStdout(StringRef Filename) { return Filename == "-"; }
|
|
|
|
ToolOutputFile::CleanupInstaller::CleanupInstaller(StringRef Filename)
|
|
: Filename(std::string(Filename)), Keep(false) {
|
|
// Arrange for the file to be deleted if the process is killed.
|
|
if (!isStdout(Filename))
|
|
sys::RemoveFileOnSignal(Filename);
|
|
}
|
|
|
|
ToolOutputFile::CleanupInstaller::~CleanupInstaller() {
|
|
if (isStdout(Filename))
|
|
return;
|
|
|
|
// Delete the file if the client hasn't told us not to.
|
|
if (!Keep)
|
|
sys::fs::remove(Filename);
|
|
|
|
// Ok, the file is successfully written and closed, or deleted. There's no
|
|
// further need to clean it up on signals.
|
|
sys::DontRemoveFileOnSignal(Filename);
|
|
}
|
|
|
|
ToolOutputFile::ToolOutputFile(StringRef Filename, std::error_code &EC,
|
|
sys::fs::OpenFlags Flags)
|
|
: Installer(Filename) {
|
|
if (isStdout(Filename)) {
|
|
OS = &outs();
|
|
EC = std::error_code();
|
|
return;
|
|
}
|
|
OSHolder.emplace(Filename, EC, Flags);
|
|
OS = OSHolder.getPointer();
|
|
// If open fails, no cleanup is needed.
|
|
if (EC)
|
|
Installer.Keep = true;
|
|
}
|
|
|
|
ToolOutputFile::ToolOutputFile(StringRef Filename, int FD)
|
|
: Installer(Filename) {
|
|
OSHolder.emplace(FD, true);
|
|
OS = OSHolder.getPointer();
|
|
}
|