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Rename getPersonalityPICSymbol to getCFIPersonalitySymbol, document it, and

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give it a bit more responsibility. Also implement it for MachO.

If hacked to use cfi, 32 bit MachO will produce

.cfi_personality 155, L___gxx_personality_v0$non_lazy_ptr

and 64 bit will produce

.cfi_presonality ___gxx_personality_v0

The general idea is that .cfi_personality gets passed the final symbol. It is
up to codegen to produce it if using indirect representation (like 32 bit
MachO), but it is up to MC to decide which relocations to create.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130341 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2011-04-27 23:08:15 +00:00
parent 685f07fac2
commit 7afec9cc0f
7 changed files with 75 additions and 23 deletions
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11
include/llvm/CodeGen/TargetLoweringObjectFileImpl.h
View File

@ -58,7 +58,6 @@ public:
virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
virtual const MCSection *getEHFrameSection() const;
virtual MCSymbol *getPersonalityPICSymbol(StringRef Name) const;
virtual void emitPersonalityValue(MCStreamer &Streamer,
const TargetMachine &TM,
@ -86,6 +85,11 @@ public:
getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
MachineModuleInfo *MMI, unsigned Encoding,
MCStreamer &Streamer) const;
// getCFIPersonalitySymbol - The symbol that gets passed to .cfi_personality.
virtual MCSymbol *
getCFIPersonalitySymbol(const GlobalValue *GV, unsigned Encoding,
Mangler *Mang, MachineModuleInfo *MMI) const;
};
@ -177,6 +181,11 @@ public:
MachineModuleInfo *MMI, unsigned Encoding,
MCStreamer &Streamer) const;
// getCFIPersonalitySymbol - The symbol that gets passed to .cfi_personality.
virtual MCSymbol *
getCFIPersonalitySymbol(const GlobalValue *GV, unsigned Encoding,
Mangler *Mang, MachineModuleInfo *MMI) const;
virtual unsigned getPersonalityEncoding() const;
virtual unsigned getLSDAEncoding() const;
virtual unsigned getFDEEncoding() const;

6
include/llvm/Target/TargetLoweringObjectFile.h
View File

@ -140,7 +140,6 @@ public:
const MCSection *getStaticDtorSection() const { return StaticDtorSection; }
const MCSection *getLSDASection() const { return LSDASection; }
virtual const MCSection *getEHFrameSection() const = 0;
virtual MCSymbol *getPersonalityPICSymbol(StringRef Name) const;
virtual void emitPersonalityValue(MCStreamer &Streamer,
const TargetMachine &TM,
const MCSymbol *Sym) const;
@ -222,6 +221,11 @@ public:
MachineModuleInfo *MMI, unsigned Encoding,
MCStreamer &Streamer) const;
// getCFIPersonalitySymbol - The symbol that gets passed to .cfi_personality.
virtual MCSymbol *
getCFIPersonalitySymbol(const GlobalValue *GV, unsigned Encoding,
Mangler *Mang, MachineModuleInfo *MMI) const;
///
const MCExpr *
getExprForDwarfReference(const MCSymbol *Sym, unsigned Encoding,

13
lib/CodeGen/AsmPrinter/DwarfCFIException.cpp
View File

@ -109,17 +109,8 @@ void DwarfCFIException::BeginFunction(const MachineFunction *MF) {
if (PerEncoding == dwarf::DW_EH_PE_omit || !Per)
return;
const MCSymbol *Sym;
switch (PerEncoding & 0x70) {
default:
report_fatal_error("We do not support this DWARF encoding yet!");
case dwarf::DW_EH_PE_absptr:
Sym = Asm->Mang->getSymbol(Per);
break;
case dwarf::DW_EH_PE_pcrel:
Sym = TLOF.getPersonalityPICSymbol(Per->getName());
break;
}
const MCSymbol *Sym = TLOF.getCFIPersonalitySymbol(Per, PerEncoding,
Asm->Mang, MMI);
Asm->OutStreamer.EmitCFIPersonality(Sym, PerEncoding);
}

47
lib/CodeGen/TargetLoweringObjectFileImpl.cpp
View File

@ -178,15 +178,29 @@ const MCSection *TargetLoweringObjectFileELF::getEHFrameSection() const {
}
MCSymbol *
TargetLoweringObjectFileELF::getPersonalityPICSymbol(StringRef Name) const {
Twine FullName = StringRef("DW.ref.") + Name;
return getContext().GetOrCreateSymbol(FullName);
TargetLoweringObjectFileELF::getCFIPersonalitySymbol(const GlobalValue *GV,
unsigned Encoding,
Mangler *Mang,
MachineModuleInfo *MMI) const {
switch (Encoding & 0x70) {
default:
report_fatal_error("We do not support this DWARF encoding yet!");
case dwarf::DW_EH_PE_absptr:
return Mang->getSymbol(GV);
break;
case dwarf::DW_EH_PE_pcrel: {
Twine FullName = StringRef("DW.ref.") + Mang->getSymbol(GV)->getName();
return getContext().GetOrCreateSymbol(FullName);
break;
}
}
}
void TargetLoweringObjectFileELF::emitPersonalityValue(MCStreamer &Streamer,
const TargetMachine &TM,
const MCSymbol *Sym) const {
MCSymbol *Label = getPersonalityPICSymbol(Sym->getName());
const MCSymbol *Sym) const {
Twine FullName = StringRef("DW.ref.") + Sym->getName();
MCSymbol *Label = getContext().GetOrCreateSymbol(FullName);
Streamer.EmitSymbolAttribute(Label, MCSA_Hidden);
Streamer.EmitSymbolAttribute(Label, MCSA_Weak);
Twine SectionName = StringRef(".data.") + Label->getName();
@ -834,6 +848,29 @@ getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
getExprForDwarfGlobalReference(GV, Mang, MMI, Encoding, Streamer);
}
MCSymbol *TargetLoweringObjectFileMachO::
getCFIPersonalitySymbol(const GlobalValue *GV, unsigned Encoding, Mangler *Mang,
MachineModuleInfo *MMI) const {
// The mach-o version of this method defaults to returning a stub reference.
MachineModuleInfoMachO &MachOMMI =
MMI->getObjFileInfo<MachineModuleInfoMachO>();
SmallString<128> Name;
Mang->getNameWithPrefix(Name, GV, true);
Name += "$non_lazy_ptr";
// Add information about the stub reference to MachOMMI so that the stub
// gets emitted by the asmprinter.
MCSymbol *SSym = getContext().GetOrCreateSymbol(Name.str());
MachineModuleInfoImpl::StubValueTy &StubSym = MachOMMI.getGVStubEntry(SSym);
if (StubSym.getPointer() == 0) {
MCSymbol *Sym = Mang->getSymbol(GV);
StubSym = MachineModuleInfoImpl::StubValueTy(Sym, !GV->hasLocalLinkage());
}
return SSym;
}
unsigned TargetLoweringObjectFileMachO::getPersonalityEncoding() const {
return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
}

9
lib/Target/TargetLoweringObjectFile.cpp
View File

@ -120,16 +120,15 @@ static bool IsNullTerminatedString(const Constant *C) {
return false;
}
MCSymbol *
TargetLoweringObjectFile::getPersonalityPICSymbol(StringRef Name) const {
assert(0 && "Not Available in this format.");
return 0;
MCSymbol *TargetLoweringObjectFile::
getCFIPersonalitySymbol(const GlobalValue *GV, unsigned Encoding, Mangler *Mang,
MachineModuleInfo *MMI) const {
return Mang->getSymbol(GV);
}
void TargetLoweringObjectFile::emitPersonalityValue(MCStreamer &Streamer,
const TargetMachine &TM,
const MCSymbol *Sym) const {
assert(0 && "Not Available in this format.");
}

6
lib/Target/X86/X86TargetObjectFile.cpp
View File

@ -38,6 +38,12 @@ getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
getExprForDwarfGlobalReference(GV, Mang, MMI, Encoding, Streamer);
}
MCSymbol *X8664_MachoTargetObjectFile::
getCFIPersonalitySymbol(const GlobalValue *GV, unsigned Encoding, Mangler *Mang,
MachineModuleInfo *MMI) const {
return Mang->getSymbol(GV);
}
unsigned X8632_ELFTargetObjectFile::getPersonalityEncoding() const {
if (TM.getRelocationModel() == Reloc::PIC_)
return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;

6
lib/Target/X86/X86TargetObjectFile.h
View File

@ -25,6 +25,12 @@ namespace llvm {
getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
MachineModuleInfo *MMI, unsigned Encoding,
MCStreamer &Streamer) const;
// getCFIPersonalitySymbol - The symbol that gets passed to
// .cfi_personality.
virtual MCSymbol *
getCFIPersonalitySymbol(const GlobalValue *GV, unsigned Encoding,
Mangler *Mang, MachineModuleInfo *MMI) const;
};
class X8632_ELFTargetObjectFile : public TargetLoweringObjectFileELF {