/*
 * 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 org.graalvm.compiler.core.test;

import org.junit.Assert;
import org.junit.Test;

import org.graalvm.compiler.debug.Debug;
import org.graalvm.compiler.nodes.StructuredGraph;
import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions;
import org.graalvm.compiler.nodes.ValuePhiNode;

/**
 * In the following tests, the correct removal of redundant phis during graph building is tested.
 */
public class PhiCreationTests extends GraalCompilerTest {

    /**
     * Dummy method to avoid javac dead code elimination.
     */
    private static void test() {
    }

    @Test
    public void test1() {
        StructuredGraph graph = parseEager("test1Snippet", AllowAssumptions.YES);
        Assert.assertFalse(graph.getNodes().filter(ValuePhiNode.class).iterator().hasNext());
    }

    public static int test1Snippet(int a) {
        if (a > 1) {
            test();
        }
        return a;
    }

    @Test
    public void test2() {
        StructuredGraph graph = parseEager("test2Snippet", AllowAssumptions.YES);
        Assert.assertFalse(graph.getNodes().filter(ValuePhiNode.class).iterator().hasNext());
    }

    public static int test2Snippet(int a) {
        while (a > 1) {
            test();
        }
        return a;
    }

    @Test
    public void test3() {
        StructuredGraph graph = parseEager("test3Snippet", AllowAssumptions.YES);
        Debug.dump(Debug.BASIC_LOG_LEVEL, graph, "Graph");
        Assert.assertFalse(graph.getNodes().filter(ValuePhiNode.class).iterator().hasNext());
    }

    public static int test3Snippet(int a) {
        while (a > 1) {
            while (a > 1) {
                test();
            }
        }
        return a;
    }

    @Test
    public void test4() {
        StructuredGraph graph = parseEager("test4Snippet", AllowAssumptions.YES);
        Debug.dump(Debug.BASIC_LOG_LEVEL, graph, "Graph");
        Assert.assertFalse(graph.getNodes().filter(ValuePhiNode.class).iterator().hasNext());
    }

    public static int test4Snippet(int a) {
        int b = 5;
        while (a > 1) {
            while (a > 1) {
                while (a > 1) {
                    try {
                        test();
                    } catch (Throwable t) {

                    }
                }
            }
            while (a > 1) {
                while (a > 1) {
                    try {
                        test();
                    } catch (Throwable t) {

                    }
                }
            }
        }
        return a + b;
    }
}