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Make ObjectFile and BitcodeReader always own the MemoryBuffer.

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This allows us to just use a std::unique_ptr to store the pointer to the buffer.
The flip side is that they have to support releasing the buffer back to the
caller.

Overall this looks like a more efficient and less brittle api.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211542 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2014-06-23 21:53:12 +00:00
parent 7e7e89f178
commit 1f659329b6
23 changed files with 117 additions and 154 deletions
Download Patch File Download Diff File Expand all files Collapse all files

35
lib/Object/ELFObjectFile.cpp
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@@ -17,8 +17,7 @@
namespace llvm {
using namespace object;
static ErrorOr<ObjectFile *> createELFObjectFileAux(MemoryBuffer *Obj,
bool BufferOwned) {
ErrorOr<ObjectFile *> ObjectFile::createELFObjectFile(MemoryBuffer *Obj) {
std::pair<unsigned char, unsigned char> Ident = getElfArchType(Obj);
std::size_t MaxAlignment =
1ULL << countTrailingZeros(uintptr_t(Obj->getBufferStart()));
@@ -28,49 +27,41 @@ static ErrorOr<ObjectFile *> createELFObjectFileAux(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, BufferOwned));
R.reset(new ELFObjectFile<ELFType<support::little, 4, false>>(Obj, EC));
else
#endif
if (MaxAlignment >= 2)
R.reset(new ELFObjectFile<ELFType<support::little, 2, false> >(
Obj, EC, BufferOwned));
R.reset(new ELFObjectFile<ELFType<support::little, 2, false>>(Obj, EC));
else
return object_error::parse_failed;
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,
BufferOwned));
R.reset(new ELFObjectFile<ELFType<support::big, 4, false>>(Obj, EC));
else
#endif
if (MaxAlignment >= 2)
R.reset(new ELFObjectFile<ELFType<support::big, 2, false> >(Obj, EC,
BufferOwned));
R.reset(new ELFObjectFile<ELFType<support::big, 2, false>>(Obj, EC));
else
return object_error::parse_failed;
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,
BufferOwned));
R.reset(new ELFObjectFile<ELFType<support::big, 8, true>>(Obj, EC));
else
#endif
if (MaxAlignment >= 2)
R.reset(new ELFObjectFile<ELFType<support::big, 2, true> >(Obj, EC,
BufferOwned));
R.reset(new ELFObjectFile<ELFType<support::big, 2, true>>(Obj, EC));
else
return object_error::parse_failed;
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, BufferOwned));
R.reset(new ELFObjectFile<ELFType<support::little, 8, true>>(Obj, EC));
else
#endif
if (MaxAlignment >= 2)
R.reset(new ELFObjectFile<ELFType<support::little, 2, true> >(
Obj, EC, BufferOwned));
R.reset(new ELFObjectFile<ELFType<support::little, 2, true>>(Obj, EC));
else
return object_error::parse_failed;
}
@@ -82,12 +73,4 @@ static ErrorOr<ObjectFile *> createELFObjectFileAux(MemoryBuffer *Obj,
return R.release();
}
ErrorOr<ObjectFile *> ObjectFile::createELFObjectFile(MemoryBuffer *Obj,
bool BufferOwned) {
ErrorOr<ObjectFile *> Ret = createELFObjectFileAux(Obj, BufferOwned);
if (BufferOwned && Ret.getError())
delete Obj;
return Ret;
}
} // end namespace llvm