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Allow for the possibility that a debug-value points 

to a SDNode that didn't have code generated for it.

llvm-svn: 100566
This commit is contained in:
Dale Johannesen 2010-04-06 21:59:56 +00:00
parent 4bd3dd956f
commit d1976e35c4
1 changed files with 13 additions and 2 deletions
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15
llvm/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
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@ -517,8 +517,19 @@ MachineInstr *InstrEmitter::EmitDbgValue(SDDbgValue *SD,
const TargetInstrDesc &II = TII->get(TargetOpcode::DBG_VALUE);
MachineInstrBuilder MIB = BuildMI(*MF, DL, II);
if (SD->getKind() == SDDbgValue::SDNODE) {
AddOperand(&*MIB, SDValue(SD->getSDNode(), SD->getResNo()),
(*MIB).getNumOperands(), &II, VRBaseMap, true /*IsDebug*/);
SDNode *Node = SD->getSDNode();
SDValue Op = SDValue(Node, SD->getResNo());
// It's possible we replaced this SDNode with other(s) and therefore
// didn't generate code for it. It's better to catch these cases where
// they happen and transfer the debug info, but trying to guarantee that
// in all cases would be very fragile; this is a safeguard for any
// that were missed.
DenseMap<SDValue, unsigned>::iterator I = VRBaseMap.find(Op);
if (I==VRBaseMap.end())
MIB.addReg(0U); // undef
else
AddOperand(&*MIB, Op, (*MIB).getNumOperands(), &II, VRBaseMap,
true /*IsDebug*/);
} else if (SD->getKind() == SDDbgValue::CONST) {
Value *V = SD->getConst();
if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {