/*

 * 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

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package org.graalvm.compiler.phases.common;

import org.graalvm.compiler.nodes.FrameState;

import org.graalvm.compiler.nodes.LoopExitNode;

import org.graalvm.compiler.nodes.ProxyNode;

import org.graalvm.compiler.nodes.StructuredGraph;

import org.graalvm.compiler.nodes.util.GraphUtil;

import org.graalvm.compiler.phases.Phase;

public class RemoveValueProxyPhase extends Phase {

    @Override

    protected void run(StructuredGraph graph) {

        for (LoopExitNode exit : graph.getNodes(LoopExitNode.TYPE)) {

            for (ProxyNode vpn : exit.proxies().snapshot()) {

                vpn.replaceAtUsagesAndDelete(vpn.value());

            }

            FrameState stateAfter = exit.stateAfter();

            if (stateAfter != null) {

                exit.setStateAfter(null);

                if (stateAfter.hasNoUsages()) {

                    GraphUtil.killWithUnusedFloatingInputs(stateAfter);

                }

            }

        }

        graph.setHasValueProxies(false);

    }

}