jdk-24/hotspot/test/compiler/arraycopy/TestArrayCopyNoInitDeopt.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
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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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/*
 * @test
 * @bug 8072016
 * @summary Infinite deoptimization/recompilation cycles in case of arraycopy with tightly coupled allocation
 * @requires vm.flavor == "server"
 * @library /testlibrary /test/lib /
 * @modules java.base/jdk.internal.misc
 *          java.management
 *
 * @build compiler.arraycopy.TestArrayCopyNoInitDeopt
 * @run driver ClassFileInstaller sun.hotspot.WhiteBox sun.hotspot.WhiteBox$WhiteBoxPermission
 *                                jdk.test.lib.Platform
 * @run main/othervm -Xmixed -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
 *                   -XX:-BackgroundCompilation -XX:-UseOnStackReplacement -XX:TypeProfileLevel=020
 *                   compiler.arraycopy.TestArrayCopyNoInitDeopt
 */

package compiler.arraycopy;

import compiler.whitebox.CompilerWhiteBoxTest;
import jdk.test.lib.Platform;
import sun.hotspot.WhiteBox;

import java.lang.reflect.Method;

public class TestArrayCopyNoInitDeopt {

    public static int[] m1(Object src) {
        if (src == null) return null;
        int[] dest = new int[10];
        try {
            System.arraycopy(src, 0, dest, 0, 10);
        } catch (ArrayStoreException npe) {
        }
        return dest;
    }

    static Object m2_src(Object src) {
        return src;
    }

    public static int[] m2(Object src) {
        if (src == null) return null;
        src = m2_src(src);
        int[] dest = new int[10];
        try {
            System.arraycopy(src, 0, dest, 0, 10);
        } catch (ArrayStoreException npe) {
        }
        return dest;
    }

    private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
    private static final int TIERED_STOP_AT_LEVEL = WHITE_BOX.getIntxVMFlag("TieredStopAtLevel").intValue();

    static boolean deoptimize(Method method, Object src_obj) throws Exception {
        for (int i = 0; i < 10; i++) {
            method.invoke(null, src_obj);
            if (!WHITE_BOX.isMethodCompiled(method)) {
                return true;
            }
        }
        return false;
    }

    static public void main(String[] args) throws Exception {
        if (!Platform.isServer()) {
            throw new Error("TESTBUG: Not server VM");
        }
        // Only execute if C2 is available
        if (TIERED_STOP_AT_LEVEL == CompilerWhiteBoxTest.COMP_LEVEL_FULL_OPTIMIZATION) {
            int[] src = new int[10];
            Object src_obj = new Object();
            Method method_m1 = TestArrayCopyNoInitDeopt.class.getMethod("m1", Object.class);
            Method method_m2 = TestArrayCopyNoInitDeopt.class.getMethod("m2", Object.class);

            // Warm up
            for (int i = 0; i < 20000; i++) {
                m1(src);
            }

            // And make sure m1 is compiled by C2
            WHITE_BOX.enqueueMethodForCompilation(method_m1, CompilerWhiteBoxTest.COMP_LEVEL_FULL_OPTIMIZATION);

            if (!WHITE_BOX.isMethodCompiled(method_m1)) {
                throw new RuntimeException("m1 not compiled");
            }

            // should deoptimize for type check
            if (!deoptimize(method_m1, src_obj)) {
                throw new RuntimeException("m1 not deoptimized");
            }

            WHITE_BOX.enqueueMethodForCompilation(method_m1, CompilerWhiteBoxTest.COMP_LEVEL_FULL_OPTIMIZATION);

            if (!WHITE_BOX.isMethodCompiled(method_m1)) {
                throw new RuntimeException("m1 not recompiled");
            }

            if (deoptimize(method_m1, src_obj)) {
                throw new RuntimeException("m1 deoptimized again");
            }

            if (WHITE_BOX.getUintxVMFlag("TypeProfileLevel") == 20) {
                // Same test as above but with speculative types

                // Warm up & make sure we collect type profiling
                for (int i = 0; i < 20000; i++) {
                    m2(src);
                }

                // And make sure m2 is compiled by C2
                WHITE_BOX.enqueueMethodForCompilation(method_m2, CompilerWhiteBoxTest.COMP_LEVEL_FULL_OPTIMIZATION);

                if (!WHITE_BOX.isMethodCompiled(method_m2)) {
                    throw new RuntimeException("m2 not compiled");
                }

                // should deoptimize for speculative type check
                if (!deoptimize(method_m2, src_obj)) {
                    throw new RuntimeException("m2 not deoptimized");
                }

                WHITE_BOX.enqueueMethodForCompilation(method_m2, CompilerWhiteBoxTest.COMP_LEVEL_FULL_OPTIMIZATION);

                if (!WHITE_BOX.isMethodCompiled(method_m2)) {
                    throw new RuntimeException("m2 not recompiled");
                }

                // should deoptimize for actual type check
                if (!deoptimize(method_m2, src_obj)) {
                    throw new RuntimeException("m2 not deoptimized");
                }

                WHITE_BOX.enqueueMethodForCompilation(method_m2, CompilerWhiteBoxTest.COMP_LEVEL_FULL_OPTIMIZATION);

                if (!WHITE_BOX.isMethodCompiled(method_m2)) {
                    throw new RuntimeException("m2 not recompiled");
                }

                if (deoptimize(method_m2, src_obj)) {
                    throw new RuntimeException("m2 deoptimized again");
                }
            }
        }
    }
}