001/*
002 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.virtual.phases.ea;
024
025import static com.oracle.graal.compiler.common.GraalOptions.*;
026
027import com.oracle.graal.nodes.*;
028import com.oracle.graal.nodes.cfg.*;
029import com.oracle.graal.phases.common.*;
030import com.oracle.graal.phases.schedule.*;
031import com.oracle.graal.phases.tiers.*;
032
033public class EarlyReadEliminationPhase extends EffectsPhase<PhaseContext> {
034
035    public EarlyReadEliminationPhase(CanonicalizerPhase canonicalizer) {
036        super(1, canonicalizer, true);
037    }
038
039    @Override
040    protected void run(StructuredGraph graph, PhaseContext context) {
041        if (VirtualUtil.matches(graph, EscapeAnalyzeOnly.getValue())) {
042            runAnalysis(graph, context);
043        }
044    }
045
046    @Override
047    protected Closure<?> createEffectsClosure(PhaseContext context, SchedulePhase schedule, ControlFlowGraph cfg) {
048        assert schedule == null;
049        return new ReadEliminationClosure(cfg);
050    }
051}