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Make ObjectFile ownership of the MemoryBuffer optional.

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This allows llvm-ar to mmap the input files only once.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200040 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2014-01-24 21:32:21 +00:00
parent 0078935812
commit 584fe2db6a
11 changed files with 98 additions and 85 deletions
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27
lib/Object/ELFObjectFile.cpp
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@ -17,7 +17,8 @@
namespace llvm {
using namespace object;
ErrorOr<ObjectFile *> ObjectFile::createELFObjectFile(MemoryBuffer *Obj) {
ErrorOr<ObjectFile *> ObjectFile::createELFObjectFile(MemoryBuffer *Obj,
bool BufferOwned) {
std::pair<unsigned char, unsigned char> Ident = getElfArchType(Obj);
std::size_t MaxAlignment =
1ULL << countTrailingZeros(uintptr_t(Obj->getBufferStart()));
@ -27,41 +28,49 @@ ErrorOr<ObjectFile *> ObjectFile::createELFObjectFile(MemoryBuffer *Obj) {
if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2LSB)
#if !LLVM_IS_UNALIGNED_ACCESS_FAST
if (MaxAlignment >= 4)
R.reset(new ELFObjectFile<ELFType<support::little, 4, false> >(Obj, EC));
R.reset(new ELFObjectFile<ELFType<support::little, 4, false> >(
Obj, EC, BufferOwned));
else
#endif
if (MaxAlignment >= 2)
R.reset(new ELFObjectFile<ELFType<support::little, 2, false> >(Obj, EC));
R.reset(new ELFObjectFile<ELFType<support::little, 2, false> >(
Obj, EC, BufferOwned));
else
llvm_unreachable("Invalid alignment for ELF file!");
else if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2MSB)
#if !LLVM_IS_UNALIGNED_ACCESS_FAST
if (MaxAlignment >= 4)
R.reset(new ELFObjectFile<ELFType<support::big, 4, false> >(Obj, EC));
R.reset(new ELFObjectFile<ELFType<support::big, 4, false> >(Obj, EC,
BufferOwned));
else
#endif
if (MaxAlignment >= 2)
R.reset(new ELFObjectFile<ELFType<support::big, 2, false> >(Obj, EC));
R.reset(new ELFObjectFile<ELFType<support::big, 2, false> >(Obj, EC,
BufferOwned));
else
llvm_unreachable("Invalid alignment for ELF file!");
else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2MSB)
#if !LLVM_IS_UNALIGNED_ACCESS_FAST
if (MaxAlignment >= 8)
R.reset(new ELFObjectFile<ELFType<support::big, 8, true> >(Obj, EC));
R.reset(new ELFObjectFile<ELFType<support::big, 8, true> >(Obj, EC,
BufferOwned));
else
#endif
if (MaxAlignment >= 2)
R.reset(new ELFObjectFile<ELFType<support::big, 2, true> >(Obj, EC));
R.reset(new ELFObjectFile<ELFType<support::big, 2, true> >(Obj, EC,
BufferOwned));
else
llvm_unreachable("Invalid alignment for ELF file!");
else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2LSB) {
#if !LLVM_IS_UNALIGNED_ACCESS_FAST
if (MaxAlignment >= 8)
R.reset(new ELFObjectFile<ELFType<support::little, 8, true> >(Obj, EC));
R.reset(new ELFObjectFile<ELFType<support::little, 8, true> >(
Obj, EC, BufferOwned));
else
#endif
if (MaxAlignment >= 2)
R.reset(new ELFObjectFile<ELFType<support::little, 2, true> >(Obj, EC));
R.reset(new ELFObjectFile<ELFType<support::little, 2, true> >(
Obj, EC, BufferOwned));
else
llvm_unreachable("Invalid alignment for ELF file!");
}