/*

 * 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.graalvm.compiler.debug.DebugContext;

import org.graalvm.compiler.debug.DebugDumpScope;

import org.graalvm.compiler.nodes.StructuredGraph;

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

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

import org.junit.Test;

/**

 * In the following tests, the usages of local variable "a" are replaced with the integer constant

 * 0. Then canonicalization is applied and it is verified that the resulting graph is equal to the

 * graph of the method that just has a "return 1" statement in it.

 */

public class DegeneratedLoopsTest extends GraalCompilerTest {

    private static final String REFERENCE_SNIPPET = "referenceSnippet";

    @SuppressWarnings("all")

    public static int referenceSnippet(int a) {

        return a;

    }

    @Test

    public void test1() {

        test("test1Snippet");

    }

    private static class UnresolvedException extends RuntimeException {

        private static final long serialVersionUID = 5215434338750728440L;

        static {

            if (true) {

                throw new UnsupportedOperationException("this class may never be initialized");

            }

        }

    }

    @SuppressWarnings("all")

    public static int test1Snippet(int a) {

        for (;;) {

            try {

                test();

                break;

            } catch (UnresolvedException e) {

            }

        }

        return a;

    }

    private static void test() {

    }

    @SuppressWarnings("try")

    private void test(final String snippet) {

        DebugContext debug = getDebugContext();

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

            StructuredGraph graph = parseEager(snippet, AllowAssumptions.YES);

            HighTierContext context = getDefaultHighTierContext();

            createInliningPhase().apply(graph, context);

            debug.dump(DebugContext.BASIC_LEVEL, graph, "Graph");

            StructuredGraph referenceGraph = parseEager(REFERENCE_SNIPPET, AllowAssumptions.YES);

            debug.dump(DebugContext.BASIC_LEVEL, referenceGraph, "ReferenceGraph");

            assertEquals(referenceGraph, graph);

        } catch (Throwable e) {

            throw debug.handle(e);

        }

    }

}