private void visitForward(NodeBitMap visited, Node node) {
if (node != null && !visited.isMarked(node)) {
visited.mark(node);
if (node.predecessor() != null) {
visitForward(visited, node.predecessor());
}
if (node instanceof MergeNode) {
// make sure that the cfg predecessors of a MergeNode are processed first
MergeNode merge = (MergeNode) node;
for (int i = 0; i < merge.forwardEndCount(); i++) {
visitForward(visited, merge.forwardEndAt(i));
}
}
for (Node input : node.inputs()) {
visitForward(visited, input);
}
if (node instanceof LoopBeginNode) {
LoopBeginNode loopBegin = (LoopBeginNode) node;
for (LoopEndNode loopEnd : loopBegin.loopEnds()) {
visitForward(visited, loopEnd);
}
}
nodes.add(node);
}
}
private void visitBackward(NodeBitMap visited, Node node) {
if (node != null && !visited.isMarked(node)) {
visited.mark(node);
for (Node successor : node.successors()) {
visitBackward(visited, successor);
}
for (Node usage : node.usages()) {
visitBackward(visited, usage);
}
nodes.add(node);
}
}