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Emit the __compact_unwind section first. If there are any frames which weren't

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emitted, emit them next as CIE/FDEs.

llvm-svn: 135807
This commit is contained in:
Bill Wendling 2011-07-22 21:18:59 +00:00
parent a289f709aa
commit d319d42aea
1 changed files with 27 additions and 14 deletions
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41
lib/MC/MCDwarf.cpp
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@ -504,10 +504,11 @@ namespace {
bool IsEH;
const MCSymbol *SectionStart;
public:
FrameEmitterImpl(bool usingCFI, bool isEH, const MCSymbol *sectionStart) :
CFAOffset(0), CIENum(0), UsingCFI(usingCFI), IsEH(isEH),
SectionStart(sectionStart) {
}
FrameEmitterImpl(bool usingCFI, bool isEH)
: CFAOffset(0), CIENum(0), UsingCFI(usingCFI), IsEH(isEH),
SectionStart(0) {}
void setSectionStart(const MCSymbol *Label) { SectionStart = Label; }
/// EmitCompactUnwind - Emit the unwind information in a compact way. If
/// we're successful, return 'true'. Otherwise, return 'false' and it will
@ -1011,26 +1012,38 @@ void MCDwarfFrameEmitter::Emit(MCStreamer &Streamer,
MCContext &Context = Streamer.getContext();
MCObjectFileInfo *MOFI =
const_cast<MCObjectFileInfo*>(Context.getObjectFileInfo());
FrameEmitterImpl Emitter(UsingCFI, IsEH);
SmallVector<MCDwarfFrameInfo, 8> RequiresFDE;
ArrayRef<MCDwarfFrameInfo> FrameArray;
if (IsEH && MOFI->getCompactUnwindSection()) {
for (unsigned i = 0, n = Streamer.getNumFrameInfos(); i < n; ++i) {
const MCDwarfFrameInfo &Frame = Streamer.getFrameInfo(i);
if (!Frame.CompactUnwindEncoding ||
!Emitter.EmitCompactUnwind(Streamer, Frame))
RequiresFDE.push_back(Streamer.getFrameInfo(i));
}
// Early exit if we don't need to emit FDEs.
if (RequiresFDE.empty()) return;
FrameArray = RequiresFDE;
} else {
FrameArray = Streamer.getFrameInfos();
}
const MCSection &Section = IsEH ? *MOFI->getEHFrameSection() :
*MOFI->getDwarfFrameSection();
Streamer.SwitchSection(&Section);
MCSymbol *SectionStart = Context.CreateTempSymbol();
Streamer.EmitLabel(SectionStart);
Emitter.setSectionStart(SectionStart);
MCSymbol *FDEEnd = NULL;
DenseMap<CIEKey, const MCSymbol*> CIEStarts;
FrameEmitterImpl Emitter(UsingCFI, IsEH, SectionStart);
const MCSymbol *DummyDebugKey = NULL;
for (unsigned i = 0, n = Streamer.getNumFrameInfos(); i < n; ++i) {
const MCDwarfFrameInfo &Frame = Streamer.getFrameInfo(i);
if (IsEH && MOFI->getCompactUnwindSection() &&
Frame.CompactUnwindEncoding &&
Emitter.EmitCompactUnwind(Streamer, Frame)) {
FDEEnd = NULL;
continue;
}
for (unsigned i = 0, n = FrameArray.size(); i < n; ++i) {
const MCDwarfFrameInfo &Frame = FrameArray[i];
CIEKey Key(Frame.Personality, Frame.PersonalityEncoding,
Frame.LsdaEncoding);
const MCSymbol *&CIEStart = IsEH ? CIEStarts[Key] : DummyDebugKey;