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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
64 lines
1.6 KiB
C++
64 lines
1.6 KiB
C++
//===- Writer.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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#ifndef LLVM_TOOLS_OBJCOPY_COFF_WRITER_H
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#define LLVM_TOOLS_OBJCOPY_COFF_WRITER_H
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#include "llvm/MC/StringTableBuilder.h"
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#include "llvm/Support/Error.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include <cstddef>
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#include <utility>
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namespace llvm {
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namespace objcopy {
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namespace coff {
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struct Object;
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class COFFWriter {
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Object &Obj;
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std::unique_ptr<WritableMemoryBuffer> Buf;
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raw_ostream &Out;
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size_t FileSize;
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size_t FileAlignment;
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size_t SizeOfInitializedData;
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StringTableBuilder StrTabBuilder;
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template <class SymbolTy> std::pair<size_t, size_t> finalizeSymbolTable();
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Error finalizeRelocTargets();
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Error finalizeSymbolContents();
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void layoutSections();
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size_t finalizeStringTable();
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Error finalize(bool IsBigObj);
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void writeHeaders(bool IsBigObj);
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void writeSections();
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template <class SymbolTy> void writeSymbolStringTables();
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Error write(bool IsBigObj);
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Error patchDebugDirectory();
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Expected<uint32_t> virtualAddressToFileAddress(uint32_t RVA);
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public:
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virtual ~COFFWriter() {}
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Error write();
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COFFWriter(Object &Obj, raw_ostream &Out)
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: Obj(Obj), Out(Out), StrTabBuilder(StringTableBuilder::WinCOFF) {}
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};
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} // end namespace coff
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} // end namespace objcopy
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} // end namespace llvm
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#endif // LLVM_TOOLS_OBJCOPY_COFF_WRITER_H
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