/*

 * Copyright (c) 2016, 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 org.graalvm.compiler.core.test;

import java.lang.reflect.Field;

import org.graalvm.compiler.nodes.StructuredGraph;

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

import org.graalvm.compiler.options.OptionValues;

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

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

import org.graalvm.compiler.virtual.phases.ea.PartialEscapePhase;

import org.junit.Test;

public class UnsafeVirtualizationTest extends GraalCompilerTest {

    public static class A {

        int f1;

        int f2;

    }

    private static final long AF1Offset;

    private static final long AF2Offset;

    static {

        long o1 = -1;

        long o2 = -1;

        try {

            Field f1 = A.class.getDeclaredField("f1");

            Field f2 = A.class.getDeclaredField("f2");

            o1 = UNSAFE.objectFieldOffset(f1);

            o2 = UNSAFE.objectFieldOffset(f2);

        } catch (NoSuchFieldException | SecurityException e) {

            throw new AssertionError(e);

        }

        AF1Offset = o1;

        AF2Offset = o2;

    }

    public static int unsafeSnippet0(int i1, int i2) {

        A a = new A();

        UNSAFE.putDouble(a, AF1Offset, i1 + i2);

        return UNSAFE.getInt(a, AF1Offset) + UNSAFE.getInt(a, AF2Offset);

    }

    public static int unsafeSnippet1(int i1, int i2) {

        A a = new A();

        UNSAFE.putDouble(a, AF1Offset, i1 + i2);

        a.f2 = i1;

        return (int) UNSAFE.getDouble(a, AF1Offset);

    }

    @Test

    public void testUnsafePEA01() {

        testPartialEscapeReadElimination(parseEager("unsafeSnippet0", AllowAssumptions.NO), false);

        testPartialEscapeReadElimination(parseEager("unsafeSnippet0", AllowAssumptions.NO), true);

    }

    @Test

    public void testUnsafePEA02() {

        testPartialEscapeReadElimination(parseEager("unsafeSnippet1", AllowAssumptions.NO), false);

        testPartialEscapeReadElimination(parseEager("unsafeSnippet1", AllowAssumptions.NO), true);

    }

    public void testPartialEscapeReadElimination(StructuredGraph graph, boolean canonicalizeBefore) {

        OptionValues options = graph.getOptions();

        PhaseContext context = getDefaultHighTierContext();

        CanonicalizerPhase canonicalizer = new CanonicalizerPhase();

        if (canonicalizeBefore) {

            canonicalizer.apply(graph, context);

        }

        new PartialEscapePhase(true, true, canonicalizer, null, options).apply(graph, context);

    }

}