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Don't depend on live ranges being present.

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DBG_VALUE instructions could be referring to non-existing virtual
registers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159020 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2012-06-22 18:51:35 +00:00
parent e024874d22
commit b150930910
1 changed files with 8 additions and 3 deletions
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11
lib/CodeGen/LiveDebugVariables.cpp
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@ -642,11 +642,16 @@ UserValue::computeIntervals(MachineRegisterInfo &MRI,
// Register locations are constrained to where the register value is live.
if (TargetRegisterInfo::isVirtualRegister(Loc.getReg())) {
LiveInterval *LI = &LIS.getInterval(Loc.getReg());
const VNInfo *VNI = LI->getVNInfoAt(Idx);
LiveInterval *LI = 0;
const VNInfo *VNI = 0;
if (LIS.hasInterval(Loc.getReg())) {
LI = &LIS.getInterval(Loc.getReg());
VNI = LI->getVNInfoAt(Idx);
}
SmallVector<SlotIndex, 16> Kills;
extendDef(Idx, LocNo, LI, VNI, &Kills, LIS, MDT, UVS);
addDefsFromCopies(LI, LocNo, Kills, Defs, MRI, LIS);
if (LI)
addDefsFromCopies(LI, LocNo, Kills, Defs, MRI, LIS);
continue;
}