//
//===----------------------------------------------------------------------===//
-#include "llvm/Object/ELF.h"
+#include "llvm/Object/ELFObjectFile.h"
+#include "llvm/Support/MathExtras.h"
namespace llvm {
-
using namespace object;
-namespace {
- std::pair<unsigned char, unsigned char>
- getElfArchType(MemoryBuffer *Object) {
- if (Object->getBufferSize() < ELF::EI_NIDENT)
- return std::make_pair((uint8_t)ELF::ELFCLASSNONE,(uint8_t)ELF::ELFDATANONE);
- return std::make_pair( (uint8_t)Object->getBufferStart()[ELF::EI_CLASS]
- , (uint8_t)Object->getBufferStart()[ELF::EI_DATA]);
- }
-}
-
// 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;
+ std::size_t MaxAlignment =
+ 1ULL << countTrailingZeros(uintptr_t(Object->getBufferStart()));
+
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)
+ return new ELFObjectFile<ELFType<support::little, 4, false> >(Object, ec);
+ else
+#endif
+ if (MaxAlignment >= 2)
+ return new ELFObjectFile<ELFType<support::little, 2, false> >(Object, 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)
+ return new ELFObjectFile<ELFType<support::big, 4, false> >(Object, ec);
+ else
+#endif
+ if (MaxAlignment >= 2)
+ return new ELFObjectFile<ELFType<support::big, 2, false> >(Object, 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)
+ return new ELFObjectFile<ELFType<support::big, 8, true> >(Object, ec);
+ else
+#endif
+ if (MaxAlignment >= 2)
+ return new ELFObjectFile<ELFType<support::big, 2, true> >(Object, 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)
+ return new ELFObjectFile<ELFType<support::little, 8, true> >(Object, ec);
+ else
+#endif
+ if (MaxAlignment >= 2)
+ return new ELFObjectFile<ELFType<support::little, 2, true> >(Object, ec);
+ else
+ llvm_unreachable("Invalid alignment for ELF file!");
}
report_fatal_error("Buffer is not an ELF object file!");