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Update the dominator tree with the correct dominator for the new 'unwind' block.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138664 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2011-08-26 21:36:12 +00:00
parent 43f51aeca8
commit e8ef4cc053
1 changed files with 5 additions and 0 deletions
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5
lib/CodeGen/DwarfEHPrepare.cpp
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@ -693,6 +693,7 @@ bool DwarfEHPrepare::InsertUnwindResumeCalls() {
// Extract the exception object from the ResumeInst and add it to the PHI node
// that feeds the _Unwind_Resume call.
BasicBlock *UnwindBBDom = Resumes[0]->getParent();
for (SmallVectorImpl<ResumeInst*>::iterator
I = Resumes.begin(), E = Resumes.end(); I != E; ++I) {
ResumeInst *RI = *I;
@ -700,6 +701,7 @@ bool DwarfEHPrepare::InsertUnwindResumeCalls() {
ExtractValueInst *ExnObj = ExtractValueInst::Create(RI->getOperand(0),
0, "exn.obj", RI);
PN->addIncoming(ExnObj, RI->getParent());
UnwindBBDom = DT->findNearestCommonDominator(RI->getParent(), UnwindBBDom);
RI->eraseFromParent();
}
@ -709,6 +711,9 @@ bool DwarfEHPrepare::InsertUnwindResumeCalls() {
// We never expect _Unwind_Resume to return.
new UnreachableInst(Ctx, UnwindBB);
// Now update DominatorTree analysis information.
DT->addNewBlock(UnwindBB, UnwindBBDom);
return true;
}