Allow for the possibility that a debug-value points
to a SDNode that didn't have code generated for it.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100566 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/InstrEmitter.cpp b/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
index 28ba343..de8f1a0 100644
--- a/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
+++ b/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
@@ -517,8 +517,19 @@
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)) {