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A bit of cleanup: early exit ApplyFixup and cache the Fixup offset. No

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functionality change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121195 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2010-12-07 23:05:20 +00:00
parent 2196caab82
commit 52e635ea35
1 changed files with 15 additions and 14 deletions
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29
lib/Target/ARM/ARMAsmBackend.cpp
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@ -133,6 +133,7 @@ static unsigned adjustFixupValue(unsigned Kind, uint64_t Value) {
} }
namespace { namespace {
// FIXME: This should be in a separate file. // FIXME: This should be in a separate file.
// ELF is an ELF of course... // ELF is an ELF of course...
class ELFARMAsmBackend : public ARMAsmBackend { class ELFARMAsmBackend : public ARMAsmBackend {
@ -160,24 +161,24 @@ public:
} }
}; };
// Fixme: Raise this to share code between Darwin and ELF. // FIXME: Raise this to share code between Darwin and ELF.
void ELFARMAsmBackend::ApplyFixup(const MCFixup &Fixup, char *Data, void ELFARMAsmBackend::ApplyFixup(const MCFixup &Fixup, char *Data,
unsigned DataSize, uint64_t Value) const { unsigned DataSize, uint64_t Value) const {
// Fixme: 2 for Thumb unsigned NumBytes = 4; // FIXME: 2 for Thumb
unsigned NumBytes = 4;
Value = adjustFixupValue(Fixup.getKind(), Value);
assert((Fixup.getOffset() % NumBytes == 0) Value = adjustFixupValue(Fixup.getKind(), Value);
&& "Offset mod NumBytes is nonzero!"); if (!Value) return; // No need to encode nothing.
// For each byte of the fragment that the fixup touches, mask in the
// bits from the fixup value. unsigned Offset = Fixup.getOffset();
// The Value has been "split up" into the appropriate bitfields above. assert(Offset % NumBytes == 0 && "Offset mod NumBytes is nonzero!");
for (unsigned i = 0; i != NumBytes; ++i) {
Data[Fixup.getOffset() + i] |= uint8_t(Value >> (i * 8)); // 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. // FIXME: This should be in a separate file.
class DarwinARMAsmBackend : public ARMAsmBackend { class DarwinARMAsmBackend : public ARMAsmBackend {
MCMachOObjectFormat Format; MCMachOObjectFormat Format;
@ -205,7 +206,6 @@ public:
return false; return false;
} }
}; };
} // end anonymous namespace
static unsigned getFixupKindNumBytes(unsigned Kind) { static unsigned getFixupKindNumBytes(unsigned Kind) {
switch (Kind) { switch (Kind) {
@ -235,6 +235,7 @@ void DarwinARMAsmBackend::ApplyFixup(const MCFixup &Fixup, char *Data,
for (unsigned i = 0; i != NumBytes; ++i) for (unsigned i = 0; i != NumBytes; ++i)
Data[Fixup.getOffset() + i] |= uint8_t(Value >> (i * 8)); Data[Fixup.getOffset() + i] |= uint8_t(Value >> (i * 8));
} }
} // end anonymous namespace } // end anonymous namespace
TargetAsmBackend *llvm::createARMAsmBackend(const Target &T, TargetAsmBackend *llvm::createARMAsmBackend(const Target &T,