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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

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 *

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 * 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,

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package org.graalvm.compiler.api.directives.test;

import java.lang.annotation.ElementType;

import java.lang.annotation.Retention;

import java.lang.annotation.RetentionPolicy;

import java.lang.annotation.Target;

import org.junit.Assert;

import org.junit.Test;

import org.graalvm.compiler.api.directives.GraalDirectives;

import org.graalvm.compiler.core.test.GraalCompilerTest;

import org.graalvm.compiler.nodes.ConstantNode;

import org.graalvm.compiler.nodes.ReturnNode;

import org.graalvm.compiler.nodes.StructuredGraph;

import org.graalvm.compiler.nodes.calc.AddNode;

import org.graalvm.compiler.nodes.calc.ConditionalNode;

/**

 * Tests for {@link GraalDirectives#opaque}.

 *

 * There are two snippets for each kind:

 * <ul>

 * <li>opaque&lt;Kind&gt;Snippet verifies that constant folding is prevented by the opaque

 * directive.

 * <li>&lt;kind&gt;Snippet verifies that constant folding does happen if the opaque directive is not

 * there.

 * </ul>

 *

 */

public class OpaqueDirectiveTest extends GraalCompilerTest {

    @Retention(RetentionPolicy.RUNTIME)

    @Target(ElementType.METHOD)

    private @interface OpaqueSnippet {

        Class<?> expectedReturnNode();

    }

    @OpaqueSnippet(expectedReturnNode = ConstantNode.class)

    public static boolean booleanSnippet() {

        return 5 > 3;

    }

    @OpaqueSnippet(expectedReturnNode = ConditionalNode.class)

    public static boolean opaqueBooleanSnippet() {

        return 5 > GraalDirectives.opaque(3);

    }

    @Test

    public void testBoolean() {

        test("booleanSnippet");

        test("opaqueBooleanSnippet");

    }

    @OpaqueSnippet(expectedReturnNode = ConstantNode.class)

    public static int intSnippet() {

        return 5 + 3;

    }

    @OpaqueSnippet(expectedReturnNode = AddNode.class)

    public static int opaqueIntSnippet() {

        return 5 + GraalDirectives.opaque(3);

    }

    @Test

    public void testInt() {

        test("intSnippet");

        test("opaqueIntSnippet");

    }

    @OpaqueSnippet(expectedReturnNode = ConstantNode.class)

    public static double doubleSnippet() {

        return 5. + 3.;

    }

    @OpaqueSnippet(expectedReturnNode = AddNode.class)

    public static double opaqueDoubleSnippet() {

        return 5. + GraalDirectives.opaque(3.);

    }

    @Test

    public void testDouble() {

        test("doubleSnippet");

        test("opaqueDoubleSnippet");

    }

    private static class Dummy {

    }

    @OpaqueSnippet(expectedReturnNode = ConstantNode.class)

    public static boolean objectSnippet() {

        Object obj = new Dummy();

        return obj == null;

    }

    @OpaqueSnippet(expectedReturnNode = ConditionalNode.class)

    public static boolean opaqueObjectSnippet() {

        Object obj = new Dummy();

        return GraalDirectives.opaque(obj) == null;

    }

    @Test

    public void testObject() {

        test("objectSnippet");

        test("opaqueObjectSnippet");

    }

    @Override

    protected boolean checkLowTierGraph(StructuredGraph graph) {

        OpaqueSnippet snippet = graph.method().getAnnotation(OpaqueSnippet.class);

        for (ReturnNode returnNode : graph.getNodes(ReturnNode.TYPE)) {

            Assert.assertEquals(snippet.expectedReturnNode(), returnNode.result().getClass());

        }

        return true;

    }

}