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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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package org.graalvm.compiler.replacements.test;

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

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

Tests that deoptimization upon volatile read will not roll back the read. The test cases rely on the fact that invocations to GraalDirectives utilities are substituted and not valid targets for deoptimization. /**
 * Tests that deoptimization upon volatile read will not roll back the read. The test cases rely on
 * the fact that invocations to {@link GraalDirectives} utilities are substituted and not valid
 * targets for deoptimization.
 */
public class DeoptimizeOnVolatileReadTest extends GraalCompilerTest {

    static class Dummy {
        boolean f1 = false;
        volatile boolean f2 = false;
    }

    public static int test1Snippet(Dummy dummy) {
        if (GraalDirectives.injectBranchProbability(0, GraalDirectives.inCompiledCode() & dummy.f1)) {
            return 1;
        }

        return 0;
    }

    @Test
    public void test1() {
        ResolvedJavaMethod method = getResolvedJavaMethod("test1Snippet");

        Dummy dummy = new Dummy();
        Result expected = executeExpected(method, null, dummy);
        assertEquals(new Result(0, null), expected);

        dummy.f1 = true;

        InstalledCode code = getCode(method);
        Result actual;

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

        // The code should get deoptimized, and resume execution at the beginning of the method.
        // Therefore it does not re-enter the branch as inCompiledCode() is false.
        assertEquals(new Result(0, null), actual);
        assertFalse(code.isValid());
    }

    public static int test2Snippet(Dummy dummy) {
        if (GraalDirectives.injectBranchProbability(0, GraalDirectives.inCompiledCode() & dummy.f2)) {
            return 1;
        }

        return 0;
    }

    @Test
    public void test2() {
        ResolvedJavaMethod method = getResolvedJavaMethod("test2Snippet");

        Dummy dummy = new Dummy();
        Result expected = executeExpected(method, null, dummy);
        assertEquals(new Result(0, null), expected);

        dummy.f2 = true;

        InstalledCode code = getCode(method);
        Result actual;

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

        // The code should get deoptimized, and resume execution at the then-branch.
        assertEquals(new Result(1, null), actual);
        assertFalse(code.isValid());
    }

}