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Align the __LD,__compact_unwind section.

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I know what would be cool! We should align the compact unwind section because
aligned data access is faster.
<rdar://problem/13723271>


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180171 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2013-04-24 03:11:14 +00:00
parent 8e46da20d9
commit c60e252ef6
1 changed files with 16 additions and 7 deletions
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23
lib/MC/MCDwarf.cpp
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@ -1177,8 +1177,6 @@ void FrameEmitterImpl::EmitCompactUnwind(MCStreamer &Streamer,
if (!DwarfEHFrameOnly && Frame.Lsda) if (!DwarfEHFrameOnly && Frame.Lsda)
Encoding |= 0x40000000; Encoding |= 0x40000000;
Streamer.SwitchSection(MOFI->getCompactUnwindSection());
// Range Start // Range Start
unsigned FDEEncoding = MOFI->getFDEEncoding(UsingCFI); unsigned FDEEncoding = MOFI->getFDEEncoding(UsingCFI);
unsigned Size = getSizeForEncoding(Streamer, FDEEncoding); unsigned Size = getSizeForEncoding(Streamer, FDEEncoding);
@ -1421,7 +1419,6 @@ MCSymbol *FrameEmitterImpl::EmitFDE(MCStreamer &streamer,
} }
// Call Frame Instructions // Call Frame Instructions
EmitCFIInstructions(streamer, frame.Instructions, frame.Begin); EmitCFIInstructions(streamer, frame.Instructions, frame.Begin);
// Padding // Padding
@ -1482,11 +1479,23 @@ void MCDwarfFrameEmitter::Emit(MCStreamer &Streamer,
ArrayRef<MCDwarfFrameInfo> FrameArray = Streamer.getFrameInfos(); ArrayRef<MCDwarfFrameInfo> FrameArray = Streamer.getFrameInfos();
// Emit the compact unwind info if available. // Emit the compact unwind info if available.
if (IsEH && MOFI->getCompactUnwindSection()) if (IsEH && MOFI->getCompactUnwindSection()) {
for (unsigned i = 0, n = Streamer.getNumFrameInfos(); i < n; ++i) { unsigned NumFrameInfos = Streamer.getNumFrameInfos();
const MCDwarfFrameInfo &Frame = Streamer.getFrameInfo(i); bool SectionEmitted = false;
Emitter.EmitCompactUnwind(Streamer, Frame);
if (NumFrameInfos) {
for (unsigned i = 0; i < NumFrameInfos; ++i) {
const MCDwarfFrameInfo &Frame = Streamer.getFrameInfo(i);
if (Frame.CompactUnwindEncoding == 0) continue;
if (!SectionEmitted) {
Streamer.SwitchSection(MOFI->getCompactUnwindSection());
Streamer.EmitValueToAlignment(Context.getAsmInfo().getPointerSize());
SectionEmitted = true;
}
Emitter.EmitCompactUnwind(Streamer, Frame);
}
} }
}
const MCSection &Section = IsEH ? *MOFI->getEHFrameSection() : const MCSection &Section = IsEH ? *MOFI->getEHFrameSection() :
*MOFI->getDwarfFrameSection(); *MOFI->getDwarfFrameSection();