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Clean out per-function data after the machine code verifier is done with it.

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Also don't dereference old pointers after they have been deleted causing
random crashes when enabling the machine code verifier.

Ahem...

I have not included a test case for the crash. It hapened when enabling the
verifier on CodeGen/X86/2009-08-06-branchfolder-crash.ll.

The crash depends on an MBB being allocated at the same address as a
previously deleted MBB. I don't think that can be reproduced reliably.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78472 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2009-08-08 15:34:50 +00:00
parent 06af2ba809
commit 6349668fca
1 changed files with 8 additions and 0 deletions
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8
lib/CodeGen/MachineVerifier.cpp
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@ -220,6 +220,14 @@ MachineVerifier::runOnMachineFunction(MachineFunction &MF)
llvm_report_error(Msg.str());
}
// Clean up.
regsLive.clear();
regsDefined.clear();
regsDead.clear();
regsKilled.clear();
regsLiveInButUnused.clear();
MBBInfoMap.clear();
return false; // no changes
}