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Factor out label difference creation.

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llvm-svn: 82282
This commit is contained in:
Bill Wendling 2009-09-18 21:37:56 +00:00
parent 66d4042178
commit 5e030245e8
2 changed files with 30 additions and 35 deletions
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59
lib/CodeGen/AsmPrinter/DwarfException.cpp
View File

@ -74,6 +74,25 @@ unsigned DwarfException::SizeOfEncodedValue(unsigned Encoding) {
return 0;
}
/// CreateLabelDiff - Emit a label and subtract it from the expression we
/// already have. This is equivalent to emitting "foo - .", but we have to emit
/// the label for "." directly.
const MCExpr *DwarfException::CreateLabelDiff(const MCExpr *ExprRef,
const char *LabelName,
unsigned Index) {
SmallString<64> Name;
raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix()
<< LabelName << Asm->getFunctionNumber()
<< "_" << Index;
MCSymbol *DotSym = Asm->OutContext.GetOrCreateSymbol(Name.str());
Asm->OutStreamer.EmitLabel(DotSym);
return MCBinaryExpr::CreateSub(ExprRef,
MCSymbolRefExpr::Create(DotSym,
Asm->OutContext),
Asm->OutContext);
}
/// EmitCIE - Emit a Common Information Entry (CIE). This holds information that
/// is shared among many Frame Description Entries. There is at least one CIE
/// in every non-empty .debug_frame section.
@ -176,23 +195,9 @@ void DwarfException::EmitCIE(const Function *PersonalityFn, unsigned Index) {
// If there is a personality, we need to indicate the function's location.
if (PersonalityRef) {
// If the reference to the personality function symbol is not already
// pc-relative, then we need to subtract our current address from it. Do
// this by emitting a label and subtracting it from the expression we
// already have. This is equivalent to emitting "foo - .", but we have to
// emit the label for "." directly.
if (!IsPersonalityPCRel) {
SmallString<64> Name;
raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix()
<< "personalityref_addr" << Asm->getFunctionNumber() << "_" << Index;
MCSymbol *DotSym = Asm->OutContext.GetOrCreateSymbol(Name.str());
Asm->OutStreamer.EmitLabel(DotSym);
PersonalityRef =
MCBinaryExpr::CreateSub(PersonalityRef,
MCSymbolRefExpr::Create(DotSym,Asm->OutContext),
Asm->OutContext);
}
if (!IsPersonalityPCRel)
PersonalityRef = CreateLabelDiff(PersonalityRef, "personalityref_addr",
Index);
O << MAI->getData32bitsDirective();
PersonalityRef->print(O, MAI);
@ -912,24 +917,8 @@ void DwarfException::EmitExceptionTable() {
IsTypeInfoIndirect,
IsTypeInfoPCRel);
if (!IsTypeInfoPCRel) {
// If the reference to the type info symbol is not already
// pc-relative, then we need to subtract our current address from it.
// Do this by emitting a label and subtracting it from the expression
// we already have. This is equivalent to emitting "foo - .", but we
// have to emit the label for "." directly.
SmallString<64> Name;
raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix()
<< "typeinforef_addr" << Asm->getFunctionNumber() << "_" << Index;
MCSymbol *DotSym = Asm->OutContext.GetOrCreateSymbol(Name.str());
Asm->OutStreamer.EmitLabel(DotSym);
TypeInfoRef =
MCBinaryExpr::CreateSub(TypeInfoRef,
MCSymbolRefExpr::Create(DotSym,
Asm->OutContext),
Asm->OutContext);
}
if (!IsTypeInfoPCRel)
TypeInfoRef = CreateLabelDiff(TypeInfoRef, "typeinforef_addr", Index);
O << MAI->getData32bitsDirective();
TypeInfoRef->print(O, MAI);

6
lib/CodeGen/AsmPrinter/DwarfException.h
View File

@ -25,6 +25,7 @@ namespace llvm {
struct LandingPadInfo;
class MachineModuleInfo;
class MCAsmInfo;
class MCExpr;
class Timer;
class raw_ostream;
@ -168,6 +169,11 @@ class VISIBILITY_HIDDEN DwarfException : public Dwarf {
const SmallVectorImpl<unsigned> &FirstActions);
void EmitExceptionTable();
/// CreateLabelDiff - Emit a label and subtract it from the expression we
/// already have. This is equivalent to emitting "foo - .", but we have to
/// emit the label for "." directly.
const MCExpr *CreateLabelDiff(const MCExpr *ExprRef, const char *LabelName,
unsigned Index);
public:
//===--------------------------------------------------------------------===//
// Main entry points.