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ARM: Share applyFixup between ELF and Darwin. 

The implementations already diverged a bit, merge them back together.

llvm-svn: 168542
This commit is contained in:
Benjamin Kramer 2012-11-24 14:36:43 +00:00
parent dd76a93af5
commit 07ea85a5e6
1 changed files with 46 additions and 63 deletions
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107
llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
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@ -114,6 +114,10 @@ public:
MCValue &Target, uint64_t &Value,
bool &IsResolved);
void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
uint64_t Value) const;
bool mayNeedRelaxation(const MCInst &Inst) const;
bool fixupNeedsRelaxation(const MCFixup &Fixup,
@ -552,65 +556,6 @@ void ARMAsmBackend::processFixupValue(const MCAssembler &Asm,
(void)adjustFixupValue(Fixup, Value, &Asm.getContext());
}
namespace {
// FIXME: This should be in a separate file.
// ELF is an ELF of course...
class ELFARMAsmBackend : public ARMAsmBackend {
public:
uint8_t OSABI;
ELFARMAsmBackend(const Target &T, const StringRef TT,
uint8_t _OSABI)
: ARMAsmBackend(T, TT), OSABI(_OSABI) { }
void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
uint64_t Value) const;
MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
return createARMELFObjectWriter(OS, OSABI);
}
};
// FIXME: Raise this to share code between Darwin and ELF.
void ELFARMAsmBackend::applyFixup(const MCFixup &Fixup, char *Data,
unsigned DataSize, uint64_t Value) const {
unsigned NumBytes = 4; // FIXME: 2 for Thumb
Value = adjustFixupValue(Fixup, Value);
if (!Value) return; // Doesn't change encoding.
unsigned Offset = Fixup.getOffset();
// For each byte of the fragment that the fixup touches, mask in the bits from
// the fixup value. The Value has been "split up" into the appropriate
// bitfields above.
for (unsigned i = 0; i != NumBytes; ++i)
Data[Offset + i] |= uint8_t((Value >> (i * 8)) & 0xff);
}
// FIXME: This should be in a separate file.
class DarwinARMAsmBackend : public ARMAsmBackend {
public:
const object::mach::CPUSubtypeARM Subtype;
DarwinARMAsmBackend(const Target &T, const StringRef TT,
object::mach::CPUSubtypeARM st)
: ARMAsmBackend(T, TT), Subtype(st) {
HasDataInCodeSupport = true;
}
MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
return createARMMachObjectWriter(OS, /*Is64Bit=*/false,
object::mach::CTM_ARM,
Subtype);
}
void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
uint64_t Value) const;
virtual bool doesSectionRequireSymbols(const MCSection &Section) const {
return false;
}
};
/// getFixupKindNumBytes - The number of bytes the fixup may change.
static unsigned getFixupKindNumBytes(unsigned Kind) {
switch (Kind) {
@ -659,7 +604,7 @@ static unsigned getFixupKindNumBytes(unsigned Kind) {
}
}
void DarwinARMAsmBackend::applyFixup(const MCFixup &Fixup, char *Data,
void ARMAsmBackend::applyFixup(const MCFixup &Fixup, char *Data,
unsigned DataSize, uint64_t Value) const {
unsigned NumBytes = getFixupKindNumBytes(Fixup.getKind());
Value = adjustFixupValue(Fixup, Value);
@ -668,12 +613,50 @@ void DarwinARMAsmBackend::applyFixup(const MCFixup &Fixup, char *Data,
unsigned Offset = Fixup.getOffset();
assert(Offset + NumBytes <= DataSize && "Invalid fixup offset!");
// For each byte of the fragment that the fixup touches, mask in the
// bits from the fixup value.
// For each byte of the fragment that the fixup touches, mask in the bits from
// the fixup value. The Value has been "split up" into the appropriate
// bitfields above.
for (unsigned i = 0; i != NumBytes; ++i)
Data[Offset + i] |= uint8_t((Value >> (i * 8)) & 0xff);
}
namespace {
// FIXME: This should be in a separate file.
// ELF is an ELF of course...
class ELFARMAsmBackend : public ARMAsmBackend {
public:
uint8_t OSABI;
ELFARMAsmBackend(const Target &T, const StringRef TT,
uint8_t _OSABI)
: ARMAsmBackend(T, TT), OSABI(_OSABI) { }
MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
return createARMELFObjectWriter(OS, OSABI);
}
};
// FIXME: This should be in a separate file.
class DarwinARMAsmBackend : public ARMAsmBackend {
public:
const object::mach::CPUSubtypeARM Subtype;
DarwinARMAsmBackend(const Target &T, const StringRef TT,
object::mach::CPUSubtypeARM st)
: ARMAsmBackend(T, TT), Subtype(st) {
HasDataInCodeSupport = true;
}
MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
return createARMMachObjectWriter(OS, /*Is64Bit=*/false,
object::mach::CTM_ARM,
Subtype);
}
virtual bool doesSectionRequireSymbols(const MCSection &Section) const {
return false;
}
};
} // end anonymous namespace
MCAsmBackend *llvm::createARMAsmBackend(const Target &T, StringRef TT, StringRef CPU) {