mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-11-02 22:04:55 +00:00
f4ccd11075
This compiles with no changes to clang/lld/lldb with MSVC and includes overloads to various functions which are used by those projects and llvm which have OwningPtr's as parameters. This should allow out of tree projects some time to move. There are also no changes to libs/Target, which should help out of tree targets have time to move, if necessary. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203083 91177308-0d34-0410-b5e6-96231b3b80d8
87 lines
2.8 KiB
C++
87 lines
2.8 KiB
C++
//===- FileUpdate.cpp - Conditionally update a file -----------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// FileUpdate is a utility for conditionally updating a file from its input
|
|
// based on whether the input differs from the output. It is used to avoid
|
|
// unnecessary modifications in a build system.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Support/CommandLine.h"
|
|
#include "llvm/Support/MemoryBuffer.h"
|
|
#include "llvm/Support/PrettyStackTrace.h"
|
|
#include "llvm/Support/Signals.h"
|
|
#include "llvm/Support/ToolOutputFile.h"
|
|
#include "llvm/Support/system_error.h"
|
|
using namespace llvm;
|
|
|
|
static cl::opt<bool>
|
|
Quiet("quiet", cl::desc("Don't print unnecessary status information"),
|
|
cl::init(false));
|
|
|
|
static cl::opt<std::string>
|
|
InputFilename("input-file", cl::desc("Input file (defaults to stdin)"),
|
|
cl::init("-"), cl::value_desc("filename"));
|
|
|
|
static cl::opt<std::string>
|
|
OutputFilename(cl::Positional, cl::desc("<output-file>"), cl::Required);
|
|
|
|
int main(int argc, char **argv) {
|
|
sys::PrintStackTraceOnErrorSignal();
|
|
PrettyStackTraceProgram X(argc, argv);
|
|
cl::ParseCommandLineOptions(argc, argv);
|
|
|
|
if (OutputFilename == "-") {
|
|
errs() << argv[0] << ": error: Can't update standard output\n";
|
|
return 1;
|
|
}
|
|
|
|
// Get the input data.
|
|
std::unique_ptr<MemoryBuffer> In;
|
|
if (error_code ec = MemoryBuffer::getFileOrSTDIN(InputFilename, In)) {
|
|
errs() << argv[0] << ": error: Unable to get input '"
|
|
<< InputFilename << "': " << ec.message() << '\n';
|
|
return 1;
|
|
}
|
|
|
|
// Get the output data.
|
|
std::unique_ptr<MemoryBuffer> Out;
|
|
MemoryBuffer::getFile(OutputFilename.c_str(), Out);
|
|
|
|
// If the output exists and the contents match, we are done.
|
|
if (Out && In->getBufferSize() == Out->getBufferSize() &&
|
|
memcmp(In->getBufferStart(), Out->getBufferStart(),
|
|
Out->getBufferSize()) == 0) {
|
|
if (!Quiet)
|
|
errs() << argv[0] << ": Not updating '" << OutputFilename
|
|
<< "', contents match input.\n";
|
|
return 0;
|
|
}
|
|
|
|
// Otherwise, overwrite the output.
|
|
if (!Quiet)
|
|
errs() << argv[0] << ": Updating '" << OutputFilename
|
|
<< "', contents changed.\n";
|
|
std::string ErrorStr;
|
|
tool_output_file OutStream(OutputFilename.c_str(), ErrorStr,
|
|
sys::fs::F_None);
|
|
if (!ErrorStr.empty()) {
|
|
errs() << argv[0] << ": Unable to write output '"
|
|
<< OutputFilename << "': " << ErrorStr << '\n';
|
|
return 1;
|
|
}
|
|
|
|
OutStream.os().write(In->getBufferStart(), In->getBufferSize());
|
|
|
|
// Declare success.
|
|
OutStream.keep();
|
|
|
|
return 0;
|
|
}
|