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

import jdk.vm.ci.code.InstalledCode;
import jdk.vm.ci.meta.ResolvedJavaMethod;

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

import org.graalvm.compiler.api.directives.GraalDirectives;
import org.graalvm.compiler.core.test.GraalCompilerTest;

public class DeoptimizeDirectiveTest extends GraalCompilerTest {

    public static boolean inCompiledCode() {
        return GraalDirectives.inCompiledCode();
    }

    @Test
    public void testInCompiledCode() {
        ResolvedJavaMethod method = getResolvedJavaMethod("inCompiledCode");

        Result interpreted = executeExpected(method, null);
        assertEquals(new Result(false, null), interpreted);

        Result compiled = executeActual(method, null);
        assertEquals(new Result(true, null), compiled);
    }

    public static boolean deoptimizeSnippet() {
        GraalDirectives.deoptimize();
        return GraalDirectives.inCompiledCode(); // should always return false
    }

    public static boolean deoptimizeAndInvalidateSnippet() {
        GraalDirectives.deoptimizeAndInvalidate();
        return GraalDirectives.inCompiledCode(); // should always return false
    }

    @Test
    public void testDeoptimize() {
        test("deoptimizeSnippet");
    }

    private boolean testDeoptimizeCheckValid(ResolvedJavaMethod method) {
        Result expected = executeExpected(method, null);

        InstalledCode code = getCode(method);
        Result actual;
        try {
            actual = new Result(code.executeVarargs(), null);
        } catch (Exception e) {
            actual = new Result(null, e);
        }

        assertEquals(expected, actual);
        return code.isValid();
    }

    @Test
    public void testDeoptimizeAndInvalidate() {
        ResolvedJavaMethod method = getResolvedJavaMethod("deoptimizeAndInvalidateSnippet");
        boolean valid = testDeoptimizeCheckValid(method);
        Assert.assertFalse("code should be invalidated", valid);
    }

    @Test
    public void testDeoptimizeDontInvalidate() {
        ResolvedJavaMethod method = getResolvedJavaMethod("deoptimizeSnippet");
        boolean valid = testDeoptimizeCheckValid(method);
        Assert.assertTrue("code should still be valid", valid);
    }

    public static int zeroBranchProbabilitySnippet(boolean flag) {
        if (GraalDirectives.injectBranchProbability(0, flag)) {
            GraalDirectives.controlFlowAnchor(); // prevent removal of the if
            return 1;
        } else {
            GraalDirectives.controlFlowAnchor(); // prevent removal of the if
            return 2;
        }
    }

    @Test
    public void testZeroBranchProbability() {
        ResolvedJavaMethod method = getResolvedJavaMethod("zeroBranchProbabilitySnippet");
        Result expected = executeExpected(method, null, true);

        InstalledCode code = getCode(method);
        Result actual;
        try {
            actual = new Result(code.executeVarargs(true), null);
        } catch (Exception e) {
            actual = new Result(null, e);
        }

        assertEquals(expected, actual);
        assertFalse("code should be invalidated", code.isValid());
    }
}
