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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).

 *

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package org.graalvm.compiler.replacements.test;

import jdk.vm.ci.meta.SpeculationLog;

import org.graalvm.compiler.code.CompilationResult;

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

import org.graalvm.compiler.debug.DebugContext;

import org.junit.Test;

import jdk.vm.ci.code.InstalledCode;

import jdk.vm.ci.code.InvalidInstalledCodeException;

import jdk.vm.ci.meta.ResolvedJavaMethod;

public class DeoptimizeOnIntegerExactTest extends GraalCompilerTest {

    private final SpeculationLog speculationLog;

    static boolean highlyLikely = true;

    static boolean highlyUnlikely = false;

    public DeoptimizeOnIntegerExactTest() {

        speculationLog = getCodeCache().createSpeculationLog();

    }

    public static int testAddExactSnippet(int x, int y) {

        if (highlyLikely) {

            return highlyUnlikely ? Math.addExact(x, y) : x;

        } else {

            return highlyUnlikely ? y : Math.addExact(x, y);

        }

    }

    public static int testSubtractExactSnippet(int x, int y) {

        if (highlyLikely) {

            return highlyUnlikely ? Math.subtractExact(x, y) : x;

        } else {

            return highlyUnlikely ? y : Math.subtractExact(x, y);

        }

    }

    public static int testMultiplyExactSnippet(int x, int y) {

        if (highlyLikely) {

            return highlyUnlikely ? Math.multiplyExact(x, y) : x;

        } else {

            return highlyUnlikely ? y : Math.multiplyExact(x, y);

        }

    }

    public static int testIncrementExactSnippet(int x, int y) {

        if (highlyLikely) {

            return highlyUnlikely ? Math.incrementExact(x) : x;

        } else {

            return highlyUnlikely ? y : Math.incrementExact(x);

        }

    }

    public static int testDecrementExactSnippet(int x, int y) {

        if (highlyLikely) {

            return highlyUnlikely ? Math.decrementExact(x) : x;

        } else {

            return highlyUnlikely ? y : Math.decrementExact(x);

        }

    }

    public void testAgainIfDeopt(String methodName, int x, int y) throws InvalidInstalledCodeException {

        ResolvedJavaMethod method = getResolvedJavaMethod(methodName);

        // We speculate on the first compilation. The global value numbering will merge the two

        // floating integer exact operation nodes.

        InstalledCode code = getCode(method);

        code.executeVarargs(x, y);

        if (!code.isValid()) {

            // At the recompilation, we anchor the floating integer exact operation nodes at their

            // corresponding branches.

            code = getCode(method);

            code.executeVarargs(x, y);

            // The recompiled code should not get deoptimized.

            assertTrue(code.isValid());

        }

    }

    @Test

    public void testAddExact() throws InvalidInstalledCodeException {

        testAgainIfDeopt("testAddExactSnippet", Integer.MAX_VALUE, 1);

    }

    @Test

    public void testSubtractExact() throws InvalidInstalledCodeException {

        testAgainIfDeopt("testSubtractExactSnippet", 0, Integer.MIN_VALUE);

    }

    @Test

    public void testMultiplyExact() throws InvalidInstalledCodeException {

        testAgainIfDeopt("testMultiplyExactSnippet", Integer.MAX_VALUE, 2);

    }

    @Test

    public void testIncrementExact() throws InvalidInstalledCodeException {

        testAgainIfDeopt("testIncrementExactSnippet", Integer.MAX_VALUE, 1);

    }

    @Test

    public void testDecrementExact() throws InvalidInstalledCodeException {

        testAgainIfDeopt("testDecrementExactSnippet", Integer.MIN_VALUE, 1);

    }

    @Override

    protected SpeculationLog getSpeculationLog() {

        speculationLog.collectFailedSpeculations();

        return speculationLog;

    }

    @Override

    protected InstalledCode addMethod(DebugContext debug, final ResolvedJavaMethod method, final CompilationResult compilationResult) {

        return getBackend().createInstalledCode(debug, method, compilationResult, speculationLog, null, false);

    }

}