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If a variable is spilled by code generator then use DW_OP_fbreg to describe its location on stack.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110234 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2010-08-04 18:40:52 +00:00
parent b57e6558c7
commit b2cf5816f9
1 changed files with 35 additions and 10 deletions
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45
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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@ -2307,7 +2307,12 @@ DwarfDebug::collectVariableInfo(const MachineFunction *MF,
}
End = *MVI;
MachineLocation MLoc;
MLoc.set(Begin->getOperand(0).getReg(), 0);
if (Begin->getNumOperands() == 3) {
if (Begin->getOperand(0).isReg() && Begin->getOperand(1).isImm())
MLoc.set(Begin->getOperand(0).getReg(), Begin->getOperand(1).getImm());
} else
MLoc = Asm->getDebugValueLocation(Begin);
const MCSymbol *FLabel = getLabelBeforeInsn(Begin);
const MCSymbol *SLabel = getLabelBeforeInsn(End);
DotDebugLocEntries.push_back(DotDebugLocEntry(FLabel, SLabel, MLoc));
@ -2315,9 +2320,14 @@ DwarfDebug::collectVariableInfo(const MachineFunction *MF,
if (MVI + 1 == MVE) {
// If End is the last instruction then its value is valid
// until the end of the funtion.
MLoc.set(End->getOperand(0).getReg(), 0);
MachineLocation EMLoc;
if (End->getNumOperands() == 3) {
if (End->getOperand(0).isReg() && Begin->getOperand(1).isImm())
EMLoc.set(Begin->getOperand(0).getReg(), Begin->getOperand(1).getImm());
} else
EMLoc = Asm->getDebugValueLocation(End);
DotDebugLocEntries.
push_back(DotDebugLocEntry(SLabel, FunctionEndSym, MLoc));
push_back(DotDebugLocEntry(SLabel, FunctionEndSym, EMLoc));
}
}
DotDebugLocEntries.push_back(DotDebugLocEntry());
@ -3637,15 +3647,30 @@ void DwarfDebug::emitDebugLoc() {
Asm->OutStreamer.EmitSymbolValue(Entry.End, Size, 0);
const TargetRegisterInfo *RI = Asm->TM.getRegisterInfo();
unsigned Reg = RI->getDwarfRegNum(Entry.Loc.getReg(), false);
if (Reg < 32) {
if (int Offset = Entry.Loc.getOffset()) {
// If the value is at a certain offset from frame register then
// use DW_OP_fbreg.
unsigned OffsetSize = Offset ? MCAsmInfo::getSLEB128Size(Offset) : 1;
Asm->OutStreamer.AddComment("Loc expr size");
Asm->EmitInt16(1);
Asm->EmitInt8(dwarf::DW_OP_reg0 + Reg);
Asm->EmitInt16(1 + OffsetSize);
Asm->OutStreamer.AddComment(
dwarf::OperationEncodingString(dwarf::DW_OP_fbreg));
Asm->EmitInt8(dwarf::DW_OP_fbreg);
Asm->OutStreamer.AddComment("Offset");
Asm->EmitSLEB128(Offset);
} else {
Asm->OutStreamer.AddComment("Loc expr size");
Asm->EmitInt16(1+MCAsmInfo::getULEB128Size(Reg));
Asm->EmitInt8(dwarf::DW_OP_regx);
Asm->EmitULEB128(Reg);
if (Reg < 32) {
Asm->OutStreamer.AddComment("Loc expr size");
Asm->EmitInt16(1);
Asm->OutStreamer.AddComment(
dwarf::OperationEncodingString(dwarf::DW_OP_breg0 + Reg));
Asm->EmitInt8(dwarf::DW_OP_reg0 + Reg);
} else {
Asm->OutStreamer.AddComment("Loc expr size");
Asm->EmitInt16(1 + MCAsmInfo::getULEB128Size(Reg));
Asm->EmitInt8(dwarf::DW_OP_regx);
Asm->EmitULEB128(Reg);
}
}
}
}