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[DebugInfo] Allow getDebugThreadLocalSymbol to return MCExpr 

This allows getDebugThreadLocalSymbol to return a generic MCExpr
instead of just a MCSymbolRefExpr.

This is in preparation for supporting debug info for TLS variables
on PowerPC, where we need to describe the variable location using
a more complex expression than just MCSymbolRefExpr.

llvm-svn: 185460
This commit is contained in:
Ulrich Weigand 2013-07-02 18:47:09 +00:00
parent 8b3d22664e
commit 2b6fc8d613
5 changed files with 7 additions and 7 deletions
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2
llvm/include/llvm/Target/TargetLoweringObjectFile.h
View File

@ -140,7 +140,7 @@ public:
/// \brief Create a symbol reference to describe the given TLS variable when
/// emitting the address in debug info.
virtual const MCSymbolRefExpr *getDebugThreadLocalSymbol(const MCSymbol *Sym) const;
virtual const MCExpr *getDebugThreadLocalSymbol(const MCSymbol *Sym) const;
protected:
virtual const MCSection *

6
llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
View File

@ -1358,7 +1358,7 @@ void CompileUnit::createGlobalVariableDIE(const MDNode *N) {
unsigned PointerSize = Asm->getDataLayout().getPointerSize();
assert((PointerSize == 4 || PointerSize == 8) &&
"Add support for other sizes if necessary");
const MCSymbolRefExpr *Ref =
const MCExpr *Expr =
Asm->getObjFileLowering().getDebugThreadLocalSymbol(Sym);
// Based on GCC's support for TLS:
if (!DD->useSplitDwarf()) {
@ -1366,10 +1366,10 @@ void CompileUnit::createGlobalVariableDIE(const MDNode *N) {
addUInt(Block, 0, dwarf::DW_FORM_data1,
PointerSize == 4 ? dwarf::DW_OP_const4u : dwarf::DW_OP_const8u);
// 2) containing the (relocated) address of the TLS variable
addExpr(Block, 0, dwarf::DW_FORM_udata, Ref);
addExpr(Block, 0, dwarf::DW_FORM_udata, Expr);
} else {
addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_const_index);
addUInt(Block, 0, dwarf::DW_FORM_udata, DU->getAddrPoolIndex(Ref));
addUInt(Block, 0, dwarf::DW_FORM_udata, DU->getAddrPoolIndex(Expr));
}
// 3) followed by a custom OP to tell the debugger about TLS (presumably)
addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_lo_user);

2
llvm/lib/Target/TargetLoweringObjectFile.cpp
View File

@ -318,7 +318,7 @@ getTTypeReference(const MCSymbolRefExpr *Sym, unsigned Encoding,
}
}
const MCSymbolRefExpr *TargetLoweringObjectFile::getDebugThreadLocalSymbol(const MCSymbol *Sym) const {
const MCExpr *TargetLoweringObjectFile::getDebugThreadLocalSymbol(const MCSymbol *Sym) const {
// FIXME: It's not clear what, if any, default this should have - perhaps a
// null return could mean 'no location' & we should just do that here.
return MCSymbolRefExpr::Create(Sym, *Ctx);

2
llvm/lib/Target/X86/X86TargetObjectFile.cpp
View File

@ -48,7 +48,7 @@ X86LinuxTargetObjectFile::Initialize(MCContext &Ctx, const TargetMachine &TM) {
InitializeELF(TM.Options.UseInitArray);
}
const MCSymbolRefExpr *
const MCExpr *
X86LinuxTargetObjectFile::getDebugThreadLocalSymbol(
const MCSymbol *Sym) const {
return MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_DTPOFF, getContext());

2
llvm/lib/Target/X86/X86TargetObjectFile.h
View File

@ -38,7 +38,7 @@ namespace llvm {
virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
/// \brief Describe a TLS variable address within debug info.
virtual const MCSymbolRefExpr *getDebugThreadLocalSymbol(const MCSymbol *Sym) const;
virtual const MCExpr *getDebugThreadLocalSymbol(const MCSymbol *Sym) const;
};
} // end namespace llvm