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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
102 lines
3.1 KiB
C++
102 lines
3.1 KiB
C++
//===- MachOUniversalWriter.h - MachO universal binary writer----*- 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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//
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// Declares the Slice class and writeUniversalBinary function for writing a
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// MachO universal binary file.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_OBJECT_MACHOUNIVERSALWRITER_H
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#define LLVM_OBJECT_MACHOUNIVERSALWRITER_H
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#include "llvm/Object/Archive.h"
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#include "llvm/Object/Binary.h"
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#include "llvm/Object/MachO.h"
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namespace llvm {
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class LLVMContext;
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namespace object {
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class IRObjectFile;
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class Slice {
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const Binary *B;
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uint32_t CPUType;
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uint32_t CPUSubType;
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std::string ArchName;
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// P2Alignment field stores slice alignment values from universal
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// binaries. This is also needed to order the slices so the total
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// file size can be calculated before creating the output buffer.
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uint32_t P2Alignment;
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Slice(const IRObjectFile &IRO, uint32_t CPUType, uint32_t CPUSubType,
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std::string ArchName, uint32_t Align);
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public:
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explicit Slice(const MachOObjectFile &O);
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Slice(const MachOObjectFile &O, uint32_t Align);
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/// This constructor takes pre-specified \param CPUType , \param CPUSubType ,
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/// \param ArchName , \param Align instead of inferring them from the archive
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/// members.
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Slice(const Archive &A, uint32_t CPUType, uint32_t CPUSubType,
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std::string ArchName, uint32_t Align);
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static Expected<Slice> create(const Archive &A,
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LLVMContext *LLVMCtx = nullptr);
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static Expected<Slice> create(const IRObjectFile &IRO, uint32_t Align);
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void setP2Alignment(uint32_t Align) { P2Alignment = Align; }
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const Binary *getBinary() const { return B; }
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uint32_t getCPUType() const { return CPUType; }
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uint32_t getCPUSubType() const { return CPUSubType; }
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uint32_t getP2Alignment() const { return P2Alignment; }
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uint64_t getCPUID() const {
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return static_cast<uint64_t>(CPUType) << 32 | CPUSubType;
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}
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std::string getArchString() const {
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if (!ArchName.empty())
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return ArchName;
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return ("unknown(" + Twine(CPUType) + "," +
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Twine(CPUSubType & ~MachO::CPU_SUBTYPE_MASK) + ")")
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.str();
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}
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friend bool operator<(const Slice &Lhs, const Slice &Rhs) {
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if (Lhs.CPUType == Rhs.CPUType)
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return Lhs.CPUSubType < Rhs.CPUSubType;
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// force arm64-family to follow after all other slices for
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// compatibility with cctools lipo
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if (Lhs.CPUType == MachO::CPU_TYPE_ARM64)
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return false;
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if (Rhs.CPUType == MachO::CPU_TYPE_ARM64)
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return true;
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// Sort by alignment to minimize file size
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return Lhs.P2Alignment < Rhs.P2Alignment;
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}
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};
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Error writeUniversalBinary(ArrayRef<Slice> Slices, StringRef OutputFileName);
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Error writeUniversalBinaryToStream(ArrayRef<Slice> Slices, raw_ostream &Out);
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} // end namespace object
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} // end namespace llvm
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#endif // LLVM_OBJECT_MACHOUNIVERSALWRITER_H
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