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80 lines
2.6 KiB
C++
80 lines
2.6 KiB
C++
//===- Buffer.cpp ---------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "Buffer.h"
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#include "llvm/Support/FileOutputBuffer.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/Process.h"
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#include <memory>
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namespace llvm {
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namespace objcopy {
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Buffer::~Buffer() {}
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static Error createEmptyFile(StringRef FileName) {
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// Create an empty tempfile and atomically swap it in place with the desired
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// output file.
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Expected<sys::fs::TempFile> Temp =
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sys::fs::TempFile::create(FileName + ".temp-empty-%%%%%%%");
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return Temp ? Temp->keep(FileName) : Temp.takeError();
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}
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Error FileBuffer::allocate(size_t Size) {
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// When a 0-sized file is requested, skip allocation but defer file
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// creation/truncation until commit() to avoid side effects if something
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// happens between allocate() and commit().
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if (Size == 0) {
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EmptyFile = true;
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return Error::success();
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}
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Expected<std::unique_ptr<FileOutputBuffer>> BufferOrErr =
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FileOutputBuffer::create(getName(), Size, FileOutputBuffer::F_executable);
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// FileOutputBuffer::create() returns an Error that is just a wrapper around
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// std::error_code. Wrap it in FileError to include the actual filename.
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if (!BufferOrErr)
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return createFileError(getName(), BufferOrErr.takeError());
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Buf = std::move(*BufferOrErr);
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return Error::success();
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}
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Error FileBuffer::commit() {
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if (EmptyFile)
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return createEmptyFile(getName());
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assert(Buf && "allocate() not called before commit()!");
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Error Err = Buf->commit();
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// FileOutputBuffer::commit() returns an Error that is just a wrapper around
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// std::error_code. Wrap it in FileError to include the actual filename.
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return Err ? createFileError(getName(), std::move(Err)) : std::move(Err);
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}
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uint8_t *FileBuffer::getBufferStart() {
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return reinterpret_cast<uint8_t *>(Buf->getBufferStart());
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}
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Error MemBuffer::allocate(size_t Size) {
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Buf = WritableMemoryBuffer::getNewMemBuffer(Size, getName());
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return Error::success();
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}
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Error MemBuffer::commit() { return Error::success(); }
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uint8_t *MemBuffer::getBufferStart() {
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return reinterpret_cast<uint8_t *>(Buf->getBufferStart());
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}
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std::unique_ptr<WritableMemoryBuffer> MemBuffer::releaseMemoryBuffer() {
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return std::move(Buf);
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}
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} // end namespace objcopy
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} // end namespace llvm
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