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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
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| .. | ||
| Archive.cpp | ||
| ArchiveWriter.cpp | ||
| Binary.cpp | ||
| CMakeLists.txt | ||
| COFFImportFile.cpp | ||
| COFFModuleDefinition.cpp | ||
| COFFObjectFile.cpp | ||
| Decompressor.cpp | ||
| ELF.cpp | ||
| ELFObjectFile.cpp | ||
| Error.cpp | ||
| FaultMapParser.cpp | ||
| IRObjectFile.cpp | ||
| IRSymtab.cpp | ||
| MachOObjectFile.cpp | ||
| MachOUniversal.cpp | ||
| MachOUniversalWriter.cpp | ||
| Minidump.cpp | ||
| ModuleSymbolTable.cpp | ||
| Object.cpp | ||
| ObjectFile.cpp | ||
| RecordStreamer.cpp | ||
| RecordStreamer.h | ||
| RelocationResolver.cpp | ||
| SymbolicFile.cpp | ||
| SymbolSize.cpp | ||
| TapiFile.cpp | ||
| TapiUniversal.cpp | ||
| WasmObjectFile.cpp | ||
| WindowsMachineFlag.cpp | ||
| WindowsResource.cpp | ||
| XCOFFObjectFile.cpp | ||