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| author | Adrian Prantl <aprantl@apple.com> | 2013-10-05 00:08:27 +0000 |
|---|---|---|
| committer | Adrian Prantl <aprantl@apple.com> | 2013-10-05 00:08:27 +0000 |
| commit | eacbfd1d512b97b5551ce9f30bf85ba000d9da42 (patch) | |
| tree | e4f6744074ec008a4fe1f9b3b3d72eec88ee560f /lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp | |
| parent | 22852c76f5791f98aadb176ebcf15af5217a67eb (diff) | |
| download | llvm-eacbfd1d512b97b5551ce9f30bf85ba000d9da42.tar.gz llvm-eacbfd1d512b97b5551ce9f30bf85ba000d9da42.tar.bz2 llvm-eacbfd1d512b97b5551ce9f30bf85ba000d9da42.tar.xz | |
Debug info: Don't crash in SelectionDAGISel when a vreg that is being
pointed to by a dbg_value belonging to a function argument is eliminated
during instruction selection.
rdar://problem/15094721.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192011 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp index fcde6b5b93..1d0ed3af45 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp @@ -408,9 +408,13 @@ bool SelectionDAGISel::runOnMachineFunction(MachineFunction &mf) { EntryMBB->insert(EntryMBB->begin(), MI); else { MachineInstr *Def = RegInfo->getVRegDef(Reg); - MachineBasicBlock::iterator InsertPos = Def; - // FIXME: VR def may not be in entry block. - Def->getParent()->insert(llvm::next(InsertPos), MI); + if (Def) { + MachineBasicBlock::iterator InsertPos = Def; + // FIXME: VR def may not be in entry block. + Def->getParent()->insert(llvm::next(InsertPos), MI); + } else + DEBUG(dbgs() << "Dropping debug info for dead vreg" + << TargetRegisterInfo::virtReg2Index(Reg) << "\n"); } // If Reg is live-in then update debug info to track its copy in a vreg. |