Mercurial > hg > graal-compiler
view graal/com.oracle.max.graal.nodes/src/com/oracle/graal/nodes/util/GraphUtil.java @ 5060:4ed4295ce15f
Update import statements.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Thu, 08 Mar 2012 19:11:12 +0100 |
parents | ed559a528128 |
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/* * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.oracle.graal.nodes.util; import static com.oracle.graal.graph.iterators.NodePredicates.*; import java.util.*; import com.oracle.graal.graph.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.calc.*; public class GraphUtil { public static void killCFG(FixedNode node) { assert node.isAlive(); if (node instanceof EndNode) { // We reached a control flow end. EndNode end = (EndNode) node; killEnd(end); } else { // Normal control flow node. for (Node successor : node.successors().snapshot()) { killCFG((FixedNode) successor); } } propagateKill(node); } private static void killEnd(EndNode end) { MergeNode merge = end.merge(); merge.removeEnd(end); if (merge instanceof LoopBeginNode && merge.forwardEndCount() == 0) { //dead loop for (PhiNode phi : merge.phis().snapshot()) { propagateKill(phi); } LoopBeginNode begin = (LoopBeginNode) merge; // disconnect and delete loop ends for (LoopEndNode loopend : begin.loopEnds().snapshot()) { loopend.predecessor().replaceFirstSuccessor(loopend, null); loopend.safeDelete(); } FixedNode next = begin.next(); begin.safeDelete(); killCFG(next); } else if (merge instanceof LoopBeginNode && ((LoopBeginNode) merge).loopEnds().isEmpty()) { // not a loop anymore ((StructuredGraph) end.graph()).reduceDegenerateLoopBegin((LoopBeginNode) merge); } else if (merge.phiPredecessorCount() == 1) { // not a merge anymore ((StructuredGraph) end.graph()).reduceTrivialMerge(merge); } } public static void propagateKill(Node node) { if (node != null && node.isAlive()) { List<Node> usagesSnapshot = node.usages().filter(isA(FloatingNode.class).or(CallTargetNode.class).or(FrameState.class)).snapshot(); // null out remaining usages node.replaceAtUsages(null); node.replaceAtPredecessors(null); killUnusedFloatingInputs(node); for (Node usage : usagesSnapshot) { if (!usage.isDeleted()) { if (usage instanceof PhiNode) { usage.replaceFirstInput(node, null); } else { propagateKill(usage); } } } } } public static void killUnusedFloatingInputs(Node node) { List<Node> floatingInputs = node.inputs().filter(isA(FloatingNode.class).or(CallTargetNode.class).or(FrameState.class)).snapshot(); node.safeDelete(); for (Node in : floatingInputs) { if (in.isAlive() && in.usages().isEmpty()) { killUnusedFloatingInputs(in); } } } }