//
//===----------------------------------------------------------------------===//
-#include "llvm/Object/ELF.h"
+#include "llvm/Object/ELFObjectFile.h"
+#include "llvm/Support/MathExtras.h"
namespace llvm {
-
using namespace object;
-// Creates an in-memory object-file by default: createELFObjectFile(Buffer)
-ObjectFile *ObjectFile::createELFObjectFile(MemoryBuffer *Object) {
- std::pair<unsigned char, unsigned char> Ident = getElfArchType(Object);
- error_code ec;
+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()));
+ error_code EC;
+ OwningPtr<ObjectFile> R;
if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2LSB)
- return new ELFObjectFile<support::little, false>(Object, ec);
+#if !LLVM_IS_UNALIGNED_ACCESS_FAST
+ if (MaxAlignment >= 4)
+ 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));
+ else
+ llvm_unreachable("Invalid alignment for ELF file!");
else if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2MSB)
- return new ELFObjectFile<support::big, false>(Object, ec);
+#if !LLVM_IS_UNALIGNED_ACCESS_FAST
+ if (MaxAlignment >= 4)
+ 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));
+ else
+ llvm_unreachable("Invalid alignment for ELF file!");
else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2MSB)
- return new ELFObjectFile<support::big, true>(Object, ec);
+#if !LLVM_IS_UNALIGNED_ACCESS_FAST
+ if (MaxAlignment >= 8)
+ 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));
+ else
+ llvm_unreachable("Invalid alignment for ELF file!");
else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2LSB) {
- ELFObjectFile<support::little, true> *result =
- new ELFObjectFile<support::little, true>(Object, ec);
- return result;
+#if !LLVM_IS_UNALIGNED_ACCESS_FAST
+ if (MaxAlignment >= 8)
+ 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));
+ else
+ llvm_unreachable("Invalid alignment for ELF file!");
}
+ else
+ report_fatal_error("Buffer is not an ELF object file!");
- report_fatal_error("Buffer is not an ELF object file!");
+ if (EC)
+ return EC;
+ return R.take();
}
} // end namespace llvm