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

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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130544 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2011-04-29 21:50:57 +00:00
parent 7f46b08082
commit 1f6c87554a
1 changed files with 22 additions and 17 deletions
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39
lib/MC/MCDwarf.cpp
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@ -679,15 +679,23 @@ const MCSymbol &FrameEmitterImpl::EmitCIE(MCStreamer &streamer,
streamer.EmitULEB128IntValue(asmInfo.getDwarfRARegNum(true)); streamer.EmitULEB128IntValue(asmInfo.getDwarfRARegNum(true));
// Augmentation Data Length (optional) // Augmentation Data Length (optional)
MCSymbol *augmentationStart = streamer.getContext().CreateTempSymbol();
MCSymbol *augmentationEnd = streamer.getContext().CreateTempSymbol(); unsigned augmentationLength = 0;
const MCExpr *augmentationLength = MakeStartMinusEndExpr(streamer, if (personality) {
*augmentationStart, // Personality Encoding
*augmentationEnd, 0); augmentationLength += 1;
streamer.EmitULEB128Value(augmentationLength); // Personality
augmentationLength += getSizeForEncoding(streamer, personalityEncoding);
}
if (lsda) {
augmentationLength += 1;
}
// Encoding of the FDE pointers
augmentationLength += 1;
streamer.EmitULEB128IntValue(augmentationLength);
// Augmentation Data (optional) // Augmentation Data (optional)
streamer.EmitLabel(augmentationStart);
if (personality) { if (personality) {
// Personality Encoding // Personality Encoding
streamer.EmitIntValue(personalityEncoding, 1); streamer.EmitIntValue(personalityEncoding, 1);
@ -700,7 +708,6 @@ const MCSymbol &FrameEmitterImpl::EmitCIE(MCStreamer &streamer,
} }
// Encoding of the FDE pointers // Encoding of the FDE pointers
streamer.EmitIntValue(asmInfo.getFDEEncoding(), 1); streamer.EmitIntValue(asmInfo.getFDEEncoding(), 1);
streamer.EmitLabel(augmentationEnd);
// Initial Instructions // Initial Instructions
@ -763,15 +770,14 @@ MCSymbol *FrameEmitterImpl::EmitFDE(MCStreamer &streamer,
streamer.EmitAbsValue(Range, size); streamer.EmitAbsValue(Range, size);
// Augmentation Data Length // Augmentation Data Length
MCSymbol *augmentationStart = streamer.getContext().CreateTempSymbol(); unsigned augmentationLength = 0;
MCSymbol *augmentationEnd = streamer.getContext().CreateTempSymbol();
const MCExpr *augmentationLength = MakeStartMinusEndExpr(streamer, if (frame.Lsda || forceLsda)
*augmentationStart, augmentationLength += getSizeForEncoding(streamer, frame.LsdaEncoding);
*augmentationEnd, 0);
streamer.EmitULEB128Value(augmentationLength); streamer.EmitULEB128IntValue(augmentationLength);
// Augmentation Data // Augmentation Data
streamer.EmitLabel(augmentationStart);
// When running in "CodeGen compatibility mode" a FDE with no LSDA can be // 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 // 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) if (frame.Lsda)
EmitSymbol(streamer, *frame.Lsda, frame.LsdaEncoding); EmitSymbol(streamer, *frame.Lsda, frame.LsdaEncoding);
else if (forceLsda) else if (forceLsda)
streamer.EmitIntValue(0, size); streamer.EmitIntValue(0, getSizeForEncoding(streamer, frame.LsdaEncoding));
streamer.EmitLabel(augmentationEnd);
// Call Frame Instructions // Call Frame Instructions
EmitCFIInstructions(streamer, frame.Instructions, frame.Begin); EmitCFIInstructions(streamer, frame.Instructions, frame.Begin);