From 605e2b518445d86491e1a0c812f7c85193d3517a Mon Sep 17 00:00:00 2001 From: Rafael Espindola Date: Wed, 24 Aug 2011 18:07:01 +0000 Subject: Fix a crashing bug in SplitBlock when it is called on a block with no dominator information even though dominators were previously computed. Patch by Nick Sumner. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138449 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Transforms/Utils/BasicBlockUtils.cpp | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) (limited to 'lib/Transforms/Utils/BasicBlockUtils.cpp') diff --git a/lib/Transforms/Utils/BasicBlockUtils.cpp b/lib/Transforms/Utils/BasicBlockUtils.cpp index 27120eeeb3..a7f9efd562 100644 --- a/lib/Transforms/Utils/BasicBlockUtils.cpp +++ b/lib/Transforms/Utils/BasicBlockUtils.cpp @@ -299,16 +299,17 @@ BasicBlock *llvm::SplitBlock(BasicBlock *Old, Instruction *SplitPt, Pass *P) { if (DominatorTree *DT = P->getAnalysisIfAvailable()) { // Old dominates New. New node dominates all other nodes dominated by Old. - DomTreeNode *OldNode = DT->getNode(Old); - std::vector Children; - for (DomTreeNode::iterator I = OldNode->begin(), E = OldNode->end(); - I != E; ++I) - Children.push_back(*I); + if (DomTreeNode *OldNode = DT->getNode(Old)) { + std::vector Children; + for (DomTreeNode::iterator I = OldNode->begin(), E = OldNode->end(); + I != E; ++I) + Children.push_back(*I); DomTreeNode *NewNode = DT->addNewBlock(New,Old); for (std::vector::iterator I = Children.begin(), E = Children.end(); I != E; ++I) DT->changeImmediateDominator(*I, NewNode); + } } return New; -- cgit v1.2.3