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[MCJIT] Add a 'decodeAddend' method to RuntimeDyldMachO and teach 

getBasicRelocationEntry to use this rather than 'memcpy' to get the
relocation addend. Targets with non-trivial addend encodings (E.g. AArch64) can
override decodeAddend to handle immediates with interesting encodings.

No functional change.

llvm-svn: 213435
This commit is contained in:
Lang Hames 2014-07-19 00:19:17 +00:00
parent 1c3d95ebc5
commit 3fda7d81c7
2 changed files with 33 additions and 26 deletions
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23
llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp
View File

@ -27,28 +27,11 @@ using namespace llvm::object;
namespace llvm {
RelocationEntry
RuntimeDyldMachO::getBasicRelocationEntry(unsigned SectionID,
ObjectImage &ObjImg,
const relocation_iterator &RI) const {
const MachOObjectFile &Obj =
static_cast<const MachOObjectFile &>(*ObjImg.getObjectFile());
MachO::any_relocation_info RelInfo =
Obj.getRelocation(RI->getRawDataRefImpl());
const SectionEntry &Section = Sections[SectionID];
bool IsPCRel = Obj.getAnyRelocationPCRel(RelInfo);
unsigned Size = Obj.getAnyRelocationLength(RelInfo);
uint64_t Offset;
RI->getOffset(Offset);
uint8_t *LocalAddress = Section.Address + Offset;
unsigned NumBytes = 1 << Size;
uint64_t RuntimeDyldMachO::decodeAddend(uint8_t *LocalAddress, unsigned NumBytes,
uint32_t RelType) const {
uint64_t Addend = 0;
memcpy(&Addend, LocalAddress, NumBytes);
uint32_t RelType = Obj.getAnyRelocationType(RelInfo);
return RelocationEntry(SectionID, Offset, RelType, Addend, IsPCRel, Size);
return Addend;
}
RelocationValueRef RuntimeDyldMachO::getRelocationValueRef(

36
llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.h
View File

@ -51,11 +51,9 @@ protected:
RuntimeDyldMachO(RTDyldMemoryManager *mm) : RuntimeDyldImpl(mm) {}
/// Parse the given relocation, which must be a non-scattered, and
/// return a RelocationEntry representing the information. The 'Addend' field
/// will contain the unmodified instruction immediate.
RelocationEntry getBasicRelocationEntry(unsigned SectionID, ObjectImage &Obj,
const relocation_iterator &RI) const;
/// Extract the addend encoded in the instruction.
uint64_t decodeAddend(uint8_t *LocalAddress, unsigned NumBytes,
uint32_t RelType) const;
/// Construct a RelocationValueRef representing the relocation target.
/// For Symbols in known sections, this will return a RelocationValueRef
@ -117,7 +115,33 @@ template <typename Impl>
class RuntimeDyldMachOCRTPBase : public RuntimeDyldMachO {
private:
Impl &impl() { return static_cast<Impl &>(*this); }
const Impl &impl() const { return static_cast<Impl &>(*this); }
const Impl &impl() const { return static_cast<const Impl &>(*this); }
protected:
/// Parse the given relocation, which must be a non-scattered, and
/// return a RelocationEntry representing the information. The 'Addend' field
/// will contain the unmodified instruction immediate.
RelocationEntry getBasicRelocationEntry(unsigned SectionID,
ObjectImage &ObjImg,
const relocation_iterator &RI) const {
const MachOObjectFile &Obj =
static_cast<const MachOObjectFile &>(*ObjImg.getObjectFile());
MachO::any_relocation_info RelInfo =
Obj.getRelocation(RI->getRawDataRefImpl());
const SectionEntry &Section = Sections[SectionID];
bool IsPCRel = Obj.getAnyRelocationPCRel(RelInfo);
unsigned Size = Obj.getAnyRelocationLength(RelInfo);
uint64_t Offset;
RI->getOffset(Offset);
uint8_t *LocalAddress = Section.Address + Offset;
unsigned NumBytes = 1 << Size;
uint32_t RelType = Obj.getAnyRelocationType(RelInfo);
uint64_t Addend = impl().decodeAddend(LocalAddress, NumBytes, RelType);
return RelocationEntry(SectionID, Offset, RelType, Addend, IsPCRel, Size);
}
public:
RuntimeDyldMachOCRTPBase(RTDyldMemoryManager *mm) : RuntimeDyldMachO(mm) {}