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Avoid some uses of .uleb128. This is a small speedup and more importantly 

lets this code be used when producing assembly code for old assemblers without
uleb support.

llvm-svn: 130544
This commit is contained in:
Rafael Espindola 2011-04-29 21:50:57 +00:00
parent 6c961e1b75
commit 6a85f9b42e
1 changed files with 22 additions and 17 deletions
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39
llvm/lib/MC/MCDwarf.cpp
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@ -679,15 +679,23 @@ const MCSymbol &FrameEmitterImpl::EmitCIE(MCStreamer &streamer,
streamer.EmitULEB128IntValue(asmInfo.getDwarfRARegNum(true));
// Augmentation Data Length (optional)
MCSymbol *augmentationStart = streamer.getContext().CreateTempSymbol();
MCSymbol *augmentationEnd = streamer.getContext().CreateTempSymbol();
const MCExpr *augmentationLength = MakeStartMinusEndExpr(streamer,
*augmentationStart,
*augmentationEnd, 0);
streamer.EmitULEB128Value(augmentationLength);
unsigned augmentationLength = 0;
if (personality) {
// Personality Encoding
augmentationLength += 1;
// Personality
augmentationLength += getSizeForEncoding(streamer, personalityEncoding);
}
if (lsda) {
augmentationLength += 1;
}
// Encoding of the FDE pointers
augmentationLength += 1;
streamer.EmitULEB128IntValue(augmentationLength);
// Augmentation Data (optional)
streamer.EmitLabel(augmentationStart);
if (personality) {
// Personality Encoding
streamer.EmitIntValue(personalityEncoding, 1);
@ -700,7 +708,6 @@ const MCSymbol &FrameEmitterImpl::EmitCIE(MCStreamer &streamer,
}
// Encoding of the FDE pointers
streamer.EmitIntValue(asmInfo.getFDEEncoding(), 1);
streamer.EmitLabel(augmentationEnd);
// Initial Instructions
@ -763,15 +770,14 @@ MCSymbol *FrameEmitterImpl::EmitFDE(MCStreamer &streamer,
streamer.EmitAbsValue(Range, size);
// Augmentation Data Length
MCSymbol *augmentationStart = streamer.getContext().CreateTempSymbol();
MCSymbol *augmentationEnd = streamer.getContext().CreateTempSymbol();
const MCExpr *augmentationLength = MakeStartMinusEndExpr(streamer,
*augmentationStart,
*augmentationEnd, 0);
streamer.EmitULEB128Value(augmentationLength);
unsigned augmentationLength = 0;
if (frame.Lsda || forceLsda)
augmentationLength += getSizeForEncoding(streamer, frame.LsdaEncoding);
streamer.EmitULEB128IntValue(augmentationLength);
// Augmentation Data
streamer.EmitLabel(augmentationStart);
// When running in "CodeGen compatibility mode" a FDE with no LSDA can be
// assigned to a CIE that requires one. In that case we output a 0 (as does
@ -779,9 +785,8 @@ MCSymbol *FrameEmitterImpl::EmitFDE(MCStreamer &streamer,
if (frame.Lsda)
EmitSymbol(streamer, *frame.Lsda, frame.LsdaEncoding);
else if (forceLsda)
streamer.EmitIntValue(0, size);
streamer.EmitIntValue(0, getSizeForEncoding(streamer, frame.LsdaEncoding));
streamer.EmitLabel(augmentationEnd);
// Call Frame Instructions
EmitCFIInstructions(streamer, frame.Instructions, frame.Begin);