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[DebugInfo] Allow getDebugThreadLocalSymbol to return MCExpr

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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.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185460 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Ulrich Weigand
2013-07-02 18:47:09 +00:00
parent 18dbe5029f
commit 716a94f0c9
5 changed files with 7 additions and 7 deletions
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2
include/llvm/Target/TargetLoweringObjectFile.h
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@@ -140,7 +140,7 @@ public:
/// \brief Create a symbol reference to describe the given TLS variable when /// \brief Create a symbol reference to describe the given TLS variable when
/// emitting the address in debug info. /// emitting the address in debug info.
virtual const MCSymbolRefExpr *getDebugThreadLocalSymbol(const MCSymbol *Sym) const; virtual const MCExpr *getDebugThreadLocalSymbol(const MCSymbol *Sym) const;
protected: protected:
virtual const MCSection * virtual const MCSection *

6
lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
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@@ -1358,7 +1358,7 @@ void CompileUnit::createGlobalVariableDIE(const MDNode *N) {
unsigned PointerSize = Asm->getDataLayout().getPointerSize(); unsigned PointerSize = Asm->getDataLayout().getPointerSize();
assert((PointerSize == 4 || PointerSize == 8) && assert((PointerSize == 4 || PointerSize == 8) &&
"Add support for other sizes if necessary"); "Add support for other sizes if necessary");
const MCSymbolRefExpr *Ref = const MCExpr *Expr =
Asm->getObjFileLowering().getDebugThreadLocalSymbol(Sym); Asm->getObjFileLowering().getDebugThreadLocalSymbol(Sym);
// Based on GCC's support for TLS: // Based on GCC's support for TLS:
if (!DD->useSplitDwarf()) { if (!DD->useSplitDwarf()) {
@@ -1366,10 +1366,10 @@ void CompileUnit::createGlobalVariableDIE(const MDNode *N) {
addUInt(Block, 0, dwarf::DW_FORM_data1, addUInt(Block, 0, dwarf::DW_FORM_data1,
PointerSize == 4 ? dwarf::DW_OP_const4u : dwarf::DW_OP_const8u); PointerSize == 4 ? dwarf::DW_OP_const4u : dwarf::DW_OP_const8u);
// 2) containing the (relocated) address of the TLS variable // 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 { } else {
addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_const_index); 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) // 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); addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_lo_user);

2
lib/Target/TargetLoweringObjectFile.cpp
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@@ -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 // 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. // null return could mean 'no location' & we should just do that here.
return MCSymbolRefExpr::Create(Sym, *Ctx); return MCSymbolRefExpr::Create(Sym, *Ctx);

2
lib/Target/X86/X86TargetObjectFile.cpp
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@@ -48,7 +48,7 @@ X86LinuxTargetObjectFile::Initialize(MCContext &Ctx, const TargetMachine &TM) {
InitializeELF(TM.Options.UseInitArray); InitializeELF(TM.Options.UseInitArray);
} }
const MCSymbolRefExpr * const MCExpr *
X86LinuxTargetObjectFile::getDebugThreadLocalSymbol( X86LinuxTargetObjectFile::getDebugThreadLocalSymbol(
const MCSymbol *Sym) const { const MCSymbol *Sym) const {
return MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_DTPOFF, getContext()); return MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_DTPOFF, getContext());

2
lib/Target/X86/X86TargetObjectFile.h
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@@ -38,7 +38,7 @@ namespace llvm {
virtual void Initialize(MCContext &Ctx, const TargetMachine &TM); virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
/// \brief Describe a TLS variable address within debug info. /// \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 } // end namespace llvm