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Preliminary patch to improve dwarf EH generation - Hooks to return Personality / FDE / LSDA / TType encoding depending on target / options (e.g. code model / relocation model) - MCIzation of Dwarf EH printer to use encoding information - Stub generation for ELF target (needed for indirect references) - Some other small changes here and there

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96285 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov
2010-02-15 22:35:59 +00:00
parent 6a7cb63f6f
commit 9184b25fa5
20 changed files with 470 additions and 297 deletions
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117
lib/Target/TargetLoweringObjectFile.cpp
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@ -17,6 +17,7 @@
#include "llvm/DerivedTypes.h"
#include "llvm/Function.h"
#include "llvm/GlobalVariable.h"
#include "llvm/CodeGen/MachineModuleInfoImpls.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCSectionMachO.h"
@ -26,6 +27,7 @@
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/ADT/SmallString.h"
@ -289,32 +291,56 @@ TargetLoweringObjectFile::getSectionForConstant(SectionKind Kind) const {
}
/// getSymbolForDwarfGlobalReference - Return an MCExpr to use for a
/// pc-relative reference to the specified global variable from exception
/// handling information. In addition to the symbol, this returns
/// by-reference:
///
/// IsIndirect - True if the returned symbol is actually a stub that contains
/// the address of the symbol, false if the symbol is the global itself.
///
/// IsPCRel - True if the symbol reference is already pc-relative, false if
/// the caller needs to subtract off the address of the reference from the
/// symbol.
///
/// reference to the specified global variable from exception
/// handling information.
const MCExpr *TargetLoweringObjectFile::
getSymbolForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
MachineModuleInfo *MMI,
bool &IsIndirect, bool &IsPCRel) const {
// The generic implementation of this just returns a direct reference to the
// symbol.
IsIndirect = false;
IsPCRel = false;
MachineModuleInfo *MMI, unsigned Encoding) const {
// FIXME: Use GetGlobalValueSymbol.
SmallString<128> Name;
Mang->getNameWithPrefix(Name, GV, false);
return MCSymbolRefExpr::Create(Name.str(), getContext());
const MCSymbol *Sym = getContext().GetOrCreateSymbol(Name.str());
return getSymbolForDwarfReference(Sym, MMI, Encoding);
}
const MCExpr *TargetLoweringObjectFile::
getSymbolForDwarfReference(const MCSymbol *Sym, MachineModuleInfo *MMI,
unsigned Encoding) const {
const MCExpr *Res = MCSymbolRefExpr::Create(Sym, getContext());
switch (Encoding & 0xF0) {
default:
llvm_report_error("Do not support this DWARF encoding yet!");
break;
case dwarf::DW_EH_PE_absptr:
// Do nothing special
break;
case dwarf::DW_EH_PE_pcrel:
// FIXME: PCSymbol
const MCExpr *PC = MCSymbolRefExpr::Create(".", getContext());
Res = MCBinaryExpr::CreateSub(Res, PC, getContext());
break;
}
return Res;
}
unsigned TargetLoweringObjectFile::getPersonalityEncoding() const {
return dwarf::DW_EH_PE_absptr;
}
unsigned TargetLoweringObjectFile::getLSDAEncoding() const {
return dwarf::DW_EH_PE_absptr;
}
unsigned TargetLoweringObjectFile::getFDEEncoding() const {
return dwarf::DW_EH_PE_absptr;
}
unsigned TargetLoweringObjectFile::getTTypeEncoding() const {
return dwarf::DW_EH_PE_absptr;
}
//===----------------------------------------------------------------------===//
// ELF
@ -671,6 +697,35 @@ getSectionForConstant(SectionKind Kind) const {
return DataRelROSection;
}
const MCExpr *TargetLoweringObjectFileELF::
getSymbolForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
MachineModuleInfo *MMI, unsigned Encoding) const {
if (Encoding & dwarf::DW_EH_PE_indirect) {
MachineModuleInfoELF &ELFMMI = MMI->getObjFileInfo<MachineModuleInfoELF>();
SmallString<128> Name;
Mang->getNameWithPrefix(Name, GV, true);
// Add information about the stub reference to ELFMMI so that the stub
// gets emitted by the asmprinter.
MCSymbol *Sym = getContext().GetOrCreateSymbol(Name.str());
MCSymbol *&StubSym = ELFMMI.getGVStubEntry(Sym);
if (StubSym == 0) {
Name.clear();
Mang->getNameWithPrefix(Name, GV, false);
StubSym = getContext().GetOrCreateSymbol(Name.str());
}
return TargetLoweringObjectFile::
getSymbolForDwarfReference(Sym, MMI,
Encoding & ~dwarf::DW_EH_PE_indirect);
}
return TargetLoweringObjectFile::
getSymbolForDwarfGlobalReference(GV, Mang, MMI, Encoding);
}
//===----------------------------------------------------------------------===//
// MachO
//===----------------------------------------------------------------------===//
@ -987,16 +1042,22 @@ shouldEmitUsedDirectiveFor(const GlobalValue *GV, Mangler *Mang) const {
const MCExpr *TargetLoweringObjectFileMachO::
getSymbolForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
MachineModuleInfo *MMI,
bool &IsIndirect, bool &IsPCRel) const {
MachineModuleInfo *MMI, unsigned Encoding) const {
// The mach-o version of this method defaults to returning a stub reference.
IsIndirect = true;
IsPCRel = false;
SmallString<128> Name;
Mang->getNameWithPrefix(Name, GV, true);
Name += "$non_lazy_ptr";
return MCSymbolRefExpr::Create(Name.str(), getContext());
if (Encoding & dwarf::DW_EH_PE_indirect) {
SmallString<128> Name;
Mang->getNameWithPrefix(Name, GV, true);
Name += "$non_lazy_ptr";
MCSymbol *Sym = getContext().GetOrCreateSymbol(Name.str());
return TargetLoweringObjectFile::
getSymbolForDwarfReference(Sym, MMI,
Encoding & ~dwarf::DW_EH_PE_indirect);
}
return TargetLoweringObjectFile::
getSymbolForDwarfGlobalReference(GV, Mang, MMI, Encoding);
}