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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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package org.graalvm.compiler.core.test;

import org.graalvm.compiler.debug.DebugContext;
import org.graalvm.compiler.nodes.ReturnNode;
import org.graalvm.compiler.nodes.StructuredGraph;
import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions;
import org.graalvm.compiler.phases.OptimisticOptimizations;
import org.graalvm.compiler.phases.OptimisticOptimizations.Optimization;
import org.graalvm.compiler.phases.common.CanonicalizerPhase;
import org.graalvm.compiler.phases.tiers.HighTierContext;
import org.junit.Test;

public class MergeCanonicalizerTest extends GraalCompilerTest {

    /**
     * These tests assume all code paths are reachable so disable profile based dead code removal.
     */
    @Override
    protected HighTierContext getDefaultHighTierContext() {
        return new HighTierContext(getProviders(), getDefaultGraphBuilderSuite(), OptimisticOptimizations.ALL.remove(Optimization.RemoveNeverExecutedCode));
    }

    public static int staticField;

    private int field;

    @Test
    public void testSplitReturn() {
        test("testSplitReturnSnippet", 2);
        testReturnCount("testSplitReturnSnippet", 2);
    }

    public int testSplitReturnSnippet(int b) {
        int v;
        if (b < 0) {
            staticField = 1;
            v = 10;
        } else {
            staticField = 2;
            v = 20;
        }
        int i = field;
        i = field + i;
        return v;
    }

    private void testReturnCount(String snippet, int returnCount) {
        StructuredGraph graph = parseEager(snippet, AllowAssumptions.YES);
        new CanonicalizerPhase().apply(graph, getProviders());
        new CanonicalizerPhase().apply(graph, getProviders());
        graph.getDebug().dump(DebugContext.BASIC_LEVEL, graph, "Graph");
        assertDeepEquals(returnCount, graph.getNodes(ReturnNode.TYPE).count());
    }
}