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c75c8e75b3
During D88827 it was requested to remove the local implementation
of Memory/File Buffers:
// TODO: refactor the buffer classes in LLVM to enable us to use them here
// directly.
This patch uses raw_ostream instead of Buffers. Generally, using streams
could allow us to reduce memory usages. No need to load all data into the
memory - the data could be streamed through a smaller buffer.
Thus, this patch uses raw_ostream as an interface for output data:
Error executeObjcopyOnBinary(CopyConfig &Config,
object::Binary &In,
raw_ostream &Out);
Note 1. This patch does not change the implementation of Writers
so that data would be directly stored into raw_ostream.
This is assumed to be done later.
Note 2. It would be better if Writers would be implemented in a such way
that data could be streamed without seeking/updating. If that would be
inconvenient then raw_ostream could be replaced with raw_pwrite_stream
to have a possibility to seek back and update file headers.
This is assumed to be done later if necessary.
Note 3. Current FileOutputBuffer allows using a memory-mapped file.
The raw_fd_ostream (which could be used if data should be stored in the file)
does not allow us to use a memory-mapped file. Memory map functionality
could be implemented for raw_fd_ostream:
It is possible to add resize() method into raw_ostream.
class raw_ostream {
void resize(uint64_t size);
}
That method, implemented for raw_fd_ostream, could create a memory-mapped file.
The streamed data would be written into that memory file then.
Thus we would be able to use memory-mapped files with raw_fd_ostream.
This is assumed to be done later if necessary.
Differential Revision: https://reviews.llvm.org/D91028
68 lines
1.9 KiB
C++
68 lines
1.9 KiB
C++
//===- MachOWriter.h --------------------------------------------*- C++ -*-===//
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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 "MachOLayoutBuilder.h"
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#include "MachOObjcopy.h"
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#include "Object.h"
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#include "llvm/BinaryFormat/MachO.h"
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#include "llvm/Object/MachO.h"
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namespace llvm {
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class Error;
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namespace objcopy {
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namespace macho {
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class MachOWriter {
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Object &O;
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bool Is64Bit;
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bool IsLittleEndian;
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uint64_t PageSize;
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std::unique_ptr<WritableMemoryBuffer> Buf;
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raw_ostream &Out;
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MachOLayoutBuilder LayoutBuilder;
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size_t headerSize() const;
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size_t loadCommandsSize() const;
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size_t symTableSize() const;
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size_t strTableSize() const;
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void writeHeader();
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void writeLoadCommands();
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template <typename StructType>
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void writeSectionInLoadCommand(const Section &Sec, uint8_t *&Out);
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void writeSections();
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void writeSymbolTable();
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void writeStringTable();
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void writeRebaseInfo();
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void writeBindInfo();
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void writeWeakBindInfo();
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void writeLazyBindInfo();
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void writeExportInfo();
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void writeIndirectSymbolTable();
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void writeLinkData(Optional<size_t> LCIndex, const LinkData &LD);
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void writeCodeSignatureData();
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void writeDataInCodeData();
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void writeFunctionStartsData();
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void writeTail();
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public:
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MachOWriter(Object &O, bool Is64Bit, bool IsLittleEndian, uint64_t PageSize,
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raw_ostream &Out)
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: O(O), Is64Bit(Is64Bit), IsLittleEndian(IsLittleEndian),
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PageSize(PageSize), Out(Out), LayoutBuilder(O, Is64Bit, PageSize) {}
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size_t totalSize() const;
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Error finalize();
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Error write();
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};
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} // end namespace macho
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} // end namespace objcopy
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} // end namespace llvm
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