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Make flow_find_dominators a little more robust.

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While a non-initial node not having predecessors is really an internal
error, segfaulting because of it is not nice.
This commit is contained in:
Bill Currie 2012-11-04 11:07:30 +09:00
parent acde6ca0a0
commit acc3beb6ab
1 changed files with 3 additions and 3 deletions
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6
tools/qfcc/source/flow.c
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@ -332,9 +332,9 @@ flow_find_dominators (flowgraph_t *graph)
for (i = 1; i < graph->num_nodes; i++) {
node = graph->nodes[i];
pred = set_first (node->predecessors);
if (pred)
set_assign (work, graph->nodes[pred->member]->dom);
for (pred = set_next (pred); pred; pred = set_next (pred))
set_empty (work);
for (pred = set_first (node->predecessors); pred;
pred = set_next (pred))
set_intersection (work, graph->nodes[pred->member]->dom);
set_add (work, i);
if (!set_is_equivalent (work, node->dom))