JDK14/Java14源码在线阅读

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * 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,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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package org.graalvm.compiler.hotspot.test;

import java.util.function.Function;

import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TestRule;

import jdk.vm.ci.code.InstalledCode;
import jdk.vm.ci.code.InvalidInstalledCodeException;
import jdk.vm.ci.code.stack.InspectedFrame;
import jdk.vm.ci.code.stack.StackIntrospection;
import jdk.vm.ci.hotspot.HotSpotJVMCIRuntime;
import jdk.vm.ci.meta.ResolvedJavaMethod;

/**
 * Create a single object which is referenced from a local, the expression stack and the lock state
 * and then ensure that identity is maintained when the frame is forced to be materialized by
 * {@link InspectedFrame#materializeVirtualObjects(boolean)}.
 */
public class HotSpotStackIntrospectionTest extends HotSpotGraalCompilerTest {

    @Rule public TestRule timeout = createTimeoutSeconds(20);

    static StackIntrospection stackIntrospection = HotSpotJVMCIRuntime.runtime().getHostJVMCIBackend().getStackIntrospection();
    static volatile int v;

    public static void testSynchronizedSnippet(Function<Void, Void> f) {
        Object a = new Object();
        synchronized (a) {
            testOnStack(a, forceFrameState(a, f), a);
            // This object should be locked so try to notify on it
            a.notify();
        }
    }

    public static void testSnippet(Function<Void, Void> f) {
        Object a = new Object();
        testOnStack(a, forceFrameState(a, f), a);
    }

    private static void testOnStack(Object a, Object a2, Object a3) {
        if (a != a2 || a != a3) {
            throw new InternalError();
        }
    }

    private static Object forceFrameState(Object a, Function<Void, Void> f) {
        // Use a volatile store to ensure a FrameState is captured after this point.
        v++;
        f.apply(null);
        return a;
    }

    @Test
    public void run() throws InvalidInstalledCodeException {
        test("testSnippet");
    }

    @Test
    public void runSynchronized() throws InvalidInstalledCodeException {
        test("testSynchronizedSnippet");
    }

    private void test(String name) throws InvalidInstalledCodeException {
        ResolvedJavaMethod method = getMetaAccess().lookupJavaMethod(getMethod(name));
        Function<Void, Void> f = o -> {

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