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Relax address updates in the eh_frame section.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122591 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2010-12-28 05:39:27 +00:00
parent 5bba084253
commit 245a1e2041
8 changed files with 145 additions and 29 deletions
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34
lib/MC/MCDwarf.cpp
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@ -460,12 +460,7 @@ static void EmitFrameMoves(MCStreamer &streamer,
if (BaseLabel && Label) {
MCSymbol *ThisSym = Label;
if (ThisSym != BaseLabel) {
// FIXME: We should relax this instead of using a DW_CFA_advance_loc4
// for every address change!
streamer.EmitIntValue(dwarf::DW_CFA_advance_loc4, 1);
const MCExpr *Length = MakeStartMinusEndExpr(streamer, *BaseLabel,
*ThisSym, 0);
streamer.EmitValue(Length, 4);
streamer.EmitDwarfAdvanceFrameAddr(BaseLabel, ThisSym);
BaseLabel = ThisSym;
}
}
@ -748,3 +743,30 @@ void MCDwarfFrameEmitter::Emit(MCStreamer &streamer) {
if (fdeEnd)
streamer.EmitLabel(fdeEnd);
}
void MCDwarfFrameEmitter::EmitAdvanceLoc(MCStreamer &Streamer,
uint64_t AddrDelta) {
SmallString<256> Tmp;
raw_svector_ostream OS(Tmp);
MCDwarfFrameEmitter::EncodeAdvanceLoc(AddrDelta, OS);
Streamer.EmitBytes(OS.str(), /*AddrSpace=*/0);
}
void MCDwarfFrameEmitter::EncodeAdvanceLoc(uint64_t AddrDelta,
raw_ostream &OS) {
// FIXME: Assumes the code alignment factor is 1.
if (isUIntN(6, AddrDelta)) {
uint8_t Opcode = dwarf::DW_CFA_advance_loc | AddrDelta;
OS << Opcode;
} else if (isUInt<8>(AddrDelta)) {
OS << uint8_t(dwarf::DW_CFA_advance_loc1);
OS << uint8_t(AddrDelta);
} else if (isUInt<16>(AddrDelta)) {
OS << uint8_t(dwarf::DW_CFA_advance_loc2);
OS << uint16_t(AddrDelta);
} else {
assert(isUInt<32>(AddrDelta));
OS << uint8_t(dwarf::DW_CFA_advance_loc4);
OS << uint32_t(AddrDelta);
}
}