Update the dominator tree with the correct dominator for the new 'unwind' block.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138664 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/DwarfEHPrepare.cpp b/lib/CodeGen/DwarfEHPrepare.cpp
index d2b129a..ed9e409 100644
--- a/lib/CodeGen/DwarfEHPrepare.cpp
+++ b/lib/CodeGen/DwarfEHPrepare.cpp
@@ -693,6 +693,7 @@
// 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 @@
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 @@
// We never expect _Unwind_Resume to return.
new UnreachableInst(Ctx, UnwindBB);
+
+ // Now update DominatorTree analysis information.
+ DT->addNewBlock(UnwindBB, UnwindBBDom);
return true;
}