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In some cases, the "fail BB dominator" may be null after the BB was split (and

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becomes reachable when before it wasn't). Check to make sure that it's not null
before trying to use it.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128434 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling
2011-03-28 23:02:18 +00:00
parent a7b8c2b6a4
commit 2d930db24f
2 changed files with 19 additions and 2 deletions
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3
lib/CodeGen/StackProtector.cpp
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@ -221,7 +221,8 @@ bool StackProtector::InsertStackProtectors() {
BasicBlock *NewBB = BB->splitBasicBlock(RI, "SP_return");
if (DT && DT->isReachableFromEntry(BB)) {
DT->addNewBlock(NewBB, BB);
FailBBDom = DT->findNearestCommonDominator(FailBBDom, BB);
if (FailBBDom)
FailBBDom = DT->findNearestCommonDominator(FailBBDom, BB);
}
// Remove default branch instruction to the new BB.