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[GISel]: Fix undefined behavior in IRTranslator

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Make sure IRTranslator->MachineIRBuilder->DebugLoc doesn't
outlive the DILocation. Clear it at the end of
IRTranslator::runOnMachineFunction

llvm-svn: 303277
This commit is contained in:
Aditya Nandakumar 2017-05-17 17:41:55 +00:00
parent 82f1302263
commit 1b45675424
1 changed files with 5 additions and 0 deletions
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5
lib/CodeGen/GlobalISel/IRTranslator.cpp
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@ -1129,6 +1129,11 @@ void IRTranslator::finalizeFunction() {
ValToVReg.clear(); ValToVReg.clear();
FrameIndices.clear(); FrameIndices.clear();
MachinePreds.clear(); MachinePreds.clear();
// MachineIRBuilder::DebugLoc can outlive the DILocation it holds. Clear it
// to avoid accessing free’d memory (in runOnMachineFunction) and to avoid
// destroying it twice (in ~IRTranslator() and ~LLVMContext())
EntryBuilder = MachineIRBuilder();
CurBuilder = MachineIRBuilder();
} }
bool IRTranslator::runOnMachineFunction(MachineFunction &CurMF) { bool IRTranslator::runOnMachineFunction(MachineFunction &CurMF) {