Mercurial > hg > truffle
diff graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/LockEliminationPhase.java @ 7493:741ceb12ff7d
Implement basic lock elimination phase.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Thu, 17 Jan 2013 00:06:27 +0100 |
parents | |
children | bf7a1be7c709 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/LockEliminationPhase.java Thu Jan 17 00:06:27 2013 +0100 @@ -0,0 +1,55 @@ +/* + * 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.phases.common; + +import com.oracle.graal.nodes.*; +import com.oracle.graal.nodes.java.*; +import com.oracle.graal.nodes.util.*; +import com.oracle.graal.phases.*; + + +public class LockEliminationPhase extends Phase { + + @Override + protected void run(StructuredGraph graph) { + for (MonitorExitNode node : graph.getNodes(MonitorExitNode.class)) { + FixedNode next = node.next(); + if (next instanceof MonitorEnterNode) { + MonitorEnterNode monitorEnterNode = (MonitorEnterNode) next; + if (monitorEnterNode.object() == node.object()) { + ((FixedWithNextNode) node.predecessor()).setNext(monitorEnterNode.next()); + FrameState stateAfterFirst = node.stateAfter(); + FrameState stateAfterSecond = monitorEnterNode.stateAfter(); + node.safeDelete(); + monitorEnterNode.safeDelete(); + if (stateAfterFirst.usages().isEmpty()) { + GraphUtil.killWithUnusedFloatingInputs(stateAfterFirst); + } + if (stateAfterSecond.usages().isEmpty()) { + GraphUtil.killWithUnusedFloatingInputs(stateAfterSecond); + } + } + } + } + } +}