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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 InspectedFrame.materializeVirtualObjects(boolean).
/** * 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 -> { stackIntrospection.iterateFrames(null, null, 0, frame -> { if (frame.getMethod().equals(method)) { frame.materializeVirtualObjects(true); } return null; }); return null; }; InstalledCode code = getCode(method); code.executeVarargs(f); } }