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Fix null reference creation in ScheduleDAGInstrs constructor call.

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Both MachineLoopInfo and MachineDominatorTree may be null in ScheduleDAGMI
constructor call. It is undefined behavior to take references to these values.

This bug is reported by UBSan.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216118 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alexey Samsonov
2014-08-20 19:36:05 +00:00
parent 4b1cddbaf0
commit ada5f2a2c7
6 changed files with 10 additions and 10 deletions
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4
lib/CodeGen/ScheduleDAGInstrs.cpp
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@ -50,8 +50,8 @@ static cl::opt<bool> UseTBAA("use-tbaa-in-sched-mi", cl::Hidden,
cl::init(true), cl::desc("Enable use of TBAA during MI GAD construction"));
ScheduleDAGInstrs::ScheduleDAGInstrs(MachineFunction &mf,
const MachineLoopInfo &mli,
const MachineDominatorTree &mdt,
const MachineLoopInfo *mli,
const MachineDominatorTree *mdt,
bool IsPostRAFlag,
bool RemoveKillFlags,
LiveIntervals *lis)