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Track the compact unwind encoding for when we are unable to generate compact unwind information. 

Compact unwind has an encoding for when we're not able to generate compact
unwind and must generate an EH frame instead. Track that, but still emit that CU
encoding.

llvm-svn: 179220
This commit is contained in:
Bill Wendling 2013-04-10 21:42:06 +00:00
parent 7c19abeba6
commit 2d1df6be87
3 changed files with 21 additions and 7 deletions
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11
llvm/include/llvm/MC/MCObjectFileInfo.h
View File

@ -46,10 +46,15 @@ protected:
unsigned FDEEncoding;
unsigned FDECFIEncoding;
unsigned TTypeEncoding;
// Section flags for eh_frame
/// Section flags for eh_frame
unsigned EHSectionType;
unsigned EHSectionFlags;
/// CompactUnwindDwarfEHFrameOnly - Compact unwind encoding indicating that we
/// should emit only an EH frame.
unsigned CompactUnwindDwarfEHFrameOnly;
/// TextSection - Section directive for standard text.
///
const MCSection *TextSection;
@ -201,6 +206,10 @@ public:
}
unsigned getTTypeEncoding() const { return TTypeEncoding; }
unsigned getCompactUnwindDwarfEHFrameOnly() const {
return CompactUnwindDwarfEHFrameOnly;
}
const MCSection *getTextSection() const { return TextSection; }
const MCSection *getDataSection() const { return DataSection; }
const MCSection *getBSSSection() const { return BSSSection; }

9
llvm/lib/MC/MCDwarf.cpp
View File

@ -1168,10 +1168,10 @@ bool FrameEmitterImpl::EmitCompactUnwind(MCStreamer &Streamer,
// .quad except_tab1
uint32_t Encoding = Frame.CompactUnwindEncoding;
if (!Encoding) return false;
bool DwarfEHFrameOnly = (Encoding == MOFI->getCompactUnwindDwarfEHFrameOnly());
// The encoding needs to know we have an LSDA.
if (Frame.Lsda)
if (!DwarfEHFrameOnly && Frame.Lsda)
Encoding |= 0x40000000;
Streamer.SwitchSection(MOFI->getCompactUnwindSection());
@ -1194,11 +1194,10 @@ bool FrameEmitterImpl::EmitCompactUnwind(MCStreamer &Streamer,
Twine::utohexstr(Encoding));
Streamer.EmitIntValue(Encoding, Size);
// Personality Function
Size = getSizeForEncoding(Streamer, dwarf::DW_EH_PE_absptr);
if (VerboseAsm) Streamer.AddComment("Personality Function");
if (Frame.Personality)
if (!DwarfEHFrameOnly && Frame.Personality)
Streamer.EmitSymbolValue(Frame.Personality, Size);
else
Streamer.EmitIntValue(0, Size); // No personality fn
@ -1206,7 +1205,7 @@ bool FrameEmitterImpl::EmitCompactUnwind(MCStreamer &Streamer,
// LSDA
Size = getSizeForEncoding(Streamer, Frame.LsdaEncoding);
if (VerboseAsm) Streamer.AddComment("LSDA");
if (Frame.Lsda)
if (!DwarfEHFrameOnly && Frame.Lsda)
Streamer.EmitSymbolValue(Frame.Lsda, Size);
else
Streamer.EmitIntValue(0, Size); // No LSDA

8
llvm/lib/MC/MCObjectFileInfo.cpp
View File

@ -145,12 +145,16 @@ void MCObjectFileInfo::InitMachOMCObjectFileInfo(Triple T) {
LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0,
SectionKind::getReadOnlyWithRel());
if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6))
if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6)) {
CompactUnwindSection =
Ctx->getMachOSection("__LD", "__compact_unwind",
MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getReadOnly());
if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86)
CompactUnwindDwarfEHFrameOnly = 0x04000000;
}
// Debug Information.
DwarfAccelNamesSection =
Ctx->getMachOSection("__DWARF", "__apple_names",
@ -629,6 +633,8 @@ void MCObjectFileInfo::InitMCObjectFileInfo(StringRef TT, Reloc::Model relocm,
PersonalityEncoding = LSDAEncoding = FDEEncoding = FDECFIEncoding =
TTypeEncoding = dwarf::DW_EH_PE_absptr;
CompactUnwindDwarfEHFrameOnly = 0;
EHFrameSection = 0; // Created on demand.
CompactUnwindSection = 0; // Used only by selected targets.
DwarfAccelNamesSection = 0; // Used only by selected targets.