/*

 * Copyright (c) 2014, 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

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 */

package org.graalvm.compiler.core.test.ea;

import org.graalvm.compiler.core.test.GraalCompilerTest;

import org.graalvm.compiler.debug.DebugContext;

import org.graalvm.compiler.debug.DebugDumpScope;

import org.graalvm.compiler.graph.Node;

import org.graalvm.compiler.nodes.FrameState;

import org.graalvm.compiler.nodes.StructuredGraph;

import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions;

import org.graalvm.compiler.nodes.java.AbstractNewObjectNode;

import org.graalvm.compiler.nodes.java.NewInstanceNode;

import org.graalvm.compiler.nodes.spi.LoweringTool;

import org.graalvm.compiler.phases.common.CanonicalizerPhase;

import org.graalvm.compiler.phases.common.LoweringPhase;

import org.graalvm.compiler.phases.common.inlining.InliningPhase;

import org.graalvm.compiler.phases.tiers.HighTierContext;

import org.graalvm.compiler.phases.tiers.PhaseContext;

import org.junit.Test;

/**

 * Tests {@link AbstractNewObjectNode#simplify(org.graalvm.compiler.graph.spi.SimplifierTool)}.

 *

 */

public class PoorMansEATest extends GraalCompilerTest {

    public static class A {

        public A obj;

    }

    public static A test1Snippet() {

        A a = new A();

        a.obj = a;

        return null;

    }

    @Test

    public void test1() {

        test("test1Snippet");

    }

    @SuppressWarnings("try")

    private void test(final String snippet) {

        DebugContext debug = getDebugContext();

        try (DebugContext.Scope s = debug.scope("PoorMansEATest", new DebugDumpScope(snippet))) {

            StructuredGraph graph = parseEager(snippet, AllowAssumptions.NO);

            HighTierContext highTierContext = getDefaultHighTierContext();

            new InliningPhase(new CanonicalizerPhase()).apply(graph, highTierContext);

            PhaseContext context = new PhaseContext(getProviders());

            new LoweringPhase(new CanonicalizerPhase(), LoweringTool.StandardLoweringStage.HIGH_TIER).apply(graph, context);

            // remove framestates in order to trigger the simplification.

            cleanup: for (FrameState fs : graph.getNodes(FrameState.TYPE).snapshot()) {

                for (Node input : fs.inputs()) {

                    if (input instanceof NewInstanceNode) {

                        fs.replaceAtUsages(null);

                        fs.safeDelete();

                        continue cleanup;

                    }

                }

            }

            new CanonicalizerPhase().apply(graph, context);

        } catch (Throwable e) {

            throw debug.handle(e);

        }

    }

}