[GR-40072] Substitute ThreadContainers on JDK 19

PullRequest: graal/12343

Author: zapster

substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/thread/Target_jdk_internal_vm_ThreadContainers.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2022, 2022, Oracle and/or its affiliates. All rights reserved.
+ * 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package com.oracle.svm.core.thread;
+
+import com.oracle.svm.core.annotate.KeepOriginal;
+import com.oracle.svm.core.annotate.Substitute;
+import com.oracle.svm.core.annotate.TargetClass;
+import com.oracle.svm.core.jdk.JDK19OrLater;
+
+/**
+ * The purpose of the target class is to support debugging and monitoring of threads. Because we
+ * currently don't provide/expose means for doing so, we replace it with an almost empty
+ * implementation.
+ */
+@TargetClass(className = "jdk.internal.vm.ThreadContainers", onlyWith = JDK19OrLater.class)
+@Substitute
+@SuppressWarnings("unused")
+final class Target_jdk_internal_vm_ThreadContainers {
+
+    @Substitute
+    public static Object registerContainer(Target_jdk_internal_vm_ThreadContainer container) {
+        return null;
+    }
+
+    @Substitute
+    public static void deregisterContainer(Object key) {
+    }
+
+    @KeepOriginal
+    public static native Target_jdk_internal_vm_ThreadContainer root();
+}
+
+@TargetClass(className = "jdk.internal.vm.ThreadContainer", onlyWith = JDK19OrLater.class)
+final class Target_jdk_internal_vm_ThreadContainer {
+}