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MC/Mach-O: Implement EmitValue using data fragments + fixups instead of fill fragment. 

llvm-svn: 96091
This commit is contained in:
Daniel Dunbar 2010-02-13 09:28:22 +00:00
parent 8e53203154
commit 1a1fbb50fc
1 changed files with 17 additions and 1 deletions
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18
llvm/lib/MC/MCMachOStreamer.cpp
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@ -333,7 +333,23 @@ void MCMachOStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
void MCMachOStreamer::EmitValue(const MCExpr *Value, unsigned Size,
unsigned AddrSpace) {
new MCFillFragment(*AddValueSymbols(Value), Size, 1, CurSectionData);
// Assume the front-end will have evaluate things absolute expressions, so
// just create data + fixup.
MCDataFragment *DF = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
if (!DF)
DF = new MCDataFragment(CurSectionData);
// Avoid fixups when possible.
int64_t AbsValue;
if (Value->EvaluateAsAbsolute(AbsValue)) {
// FIXME: Endianness assumption.
for (unsigned i = 0; i != Size; ++i)
DF->getContents().push_back(uint8_t(AbsValue >> (i * 8)));
} else {
DF->getFixups().push_back(MCAsmFixup(DF->getContents().size(),
*AddValueSymbols(Value), Size));
DF->getContents().resize(DF->getContents().size() + Size, 0);
}
}
void MCMachOStreamer::EmitValueToAlignment(unsigned ByteAlignment,