in "CFG::Remove_bb", When an EH region end block is removed, we did not provide a new region end. This fix identifies whether the BB to be deleted is an EH region end. If so, we use its previous node as the new region end.
Index: be/opt/opt_cfg.cxx
===================================================================
--- be/opt/opt_cfg.cxx (revision 1291)
+++ be/opt/opt_cfg.cxx (revision 1292)
@@ -226,6 +226,32 @@
pred->Remove_succ( bb, Mem_pool() );
}
+ if (bb->EH_region() && bb->Rid()) {
+ // If bb is in a EH region, walk up Prev() link to find the region start.
+ // If bb is the region end, make its Prev() node to be the new
+ // region end.
+ INT id = RID_id(bb->Rid());
+ STACK<INT> * stk = CXX_NEW(STACK<INT> (Mem_pool()), Mem_pool());
+ stk->Push(id);
+ BB_NODE * bb_iter = bb;
+ while (bb_iter && bb_iter->Rid() && !stk->Is_Empty()) {
+ INT iter_id = RID_id(bb_iter->Rid());
+ if (stk->Top() != iter_id) {
+ stk->Push(iter_id);
+ }
+ else if (bb_iter->Kind() == BB_REGIONSTART) {
+ BB_REGION * region = bb_iter->Regioninfo();
+ if (region && (region->Region_end() == bb)) {
+ BB_NODE * bb_prev = bb->Prev();
+ region->Set_region_end(bb_prev);
+ }
+ stk->Pop();
+ }
+ bb_iter = bb_iter->Prev();
+ }
+ CXX_DELETE(stk, Mem_pool());
+ }
+
if (bb->Is_first())
_first_bb = bb->Next();
if (bb->Is_last())
odc_1292
Description: odc_1292
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