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[MCJIT] Fix a bug RuntimeDyldImpl's read/writeBytesUnaligned methods.

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The previous implementation was writing to the high-bytes of integers on BE
targets (when run on LE hosts).

http://llvm.org/PR20640



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217325 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Lang Hames 2014-09-07 02:05:26 +00:00
parent 324a7cd8be
commit 277bb8dd4d
1 changed files with 17 additions and 19 deletions
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36
lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp
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@ -398,32 +398,30 @@ unsigned RuntimeDyldImpl::computeSectionStubBufSize(ObjectImage &Obj,
uint64_t RuntimeDyldImpl::readBytesUnaligned(uint8_t *Src,
unsigned Size) const {
uint64_t Result = 0;
uint8_t *Dst = reinterpret_cast<uint8_t*>(&Result);
if (IsTargetLittleEndian == sys::IsLittleEndianHost) {
if (!sys::IsLittleEndianHost)
Dst += sizeof(Result) - Size;
memcpy(Dst, Src, Size);
} else {
Dst += Size - 1;
for (unsigned i = 0; i < Size; ++i)
*Dst-- = *Src++;
}
if (IsTargetLittleEndian) {
Src += Size - 1;
while (Size--)
Result = (Result << 8) | *Src--;
} else
while (Size--)
Result = (Result << 8) | *Src++;
return Result;
}
void RuntimeDyldImpl::writeBytesUnaligned(uint64_t Value, uint8_t *Dst,
unsigned Size) const {
uint8_t *Src = reinterpret_cast<uint8_t*>(&Value);
if (IsTargetLittleEndian == sys::IsLittleEndianHost) {
if (!sys::IsLittleEndianHost)
Src += sizeof(Value) - Size;
memcpy(Dst, Src, Size);
if (IsTargetLittleEndian) {
while (Size--) {
*Dst++ = Value & 0xFF;
Value >>= 8;
}
} else {
Src += Size - 1;
for (unsigned i = 0; i < Size; ++i)
*Dst++ = *Src--;
Dst += Size - 1;
while (Size--) {
*Dst-- = Value & 0xFF;
Value >>= 8;
}
}
}