hotspot/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.test/src/org/graalvm/compiler/core/test/StraighteningTest.java

/*
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 * 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;

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

public class StraighteningTest extends GraalCompilerTest {

    private static final String REFERENCE_SNIPPET = "ref";

    public static boolean ref(int a, int b) {
        return a == b;
    }

    public static boolean test1Snippet(int a, int b) {
        int c = a;
        if (c == b) {
            c = 0x55;
        }
        if (c != 0x55) {
            return false;
        }
        return true;
    }

    public static boolean test3Snippet(int a, int b) {
        int val = (int) System.currentTimeMillis();
        int c = val + 1;
        if (a == b) {
            c = val;
        }
        if (c != val) {
            return false;
        }
        return true;
    }

    public static boolean test2Snippet(int a, int b) {
        int c;
        if (a == b) {
            c = 1;
        } else {
            c = 0;
        }
        return c == 1;
    }

    @Test(expected = AssertionError.class)
    public void test1() {
        test("test1Snippet");
    }

    public void test2() {
        test("test2Snippet");
    }

    @Test(expected = AssertionError.class)
    public void test3() {
        test("test3Snippet");
    }

    private void test(final String snippet) {
        // No debug scope to reduce console noise for @Test(expected = ...) tests
        StructuredGraph graph = parseEager(snippet, AllowAssumptions.YES);
        Debug.dump(Debug.BASIC_LOG_LEVEL, graph, "Graph");
        new CanonicalizerPhase().apply(graph, new PhaseContext(getProviders()));
        StructuredGraph referenceGraph = parseEager(REFERENCE_SNIPPET, AllowAssumptions.YES);
        assertEquals(referenceGraph, graph);
    }
}