Make first real commit: copy of CaRMetal 4.2.8

org/mozilla/javascript/jdk13/VMBridge_jdk13.java

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+/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ *
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Rhino code, released
+ * May 6, 1999.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1997-2000
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * the GNU General Public License Version 2 or later (the "GPL"), in which
+ * case the provisions of the GPL are applicable instead of those above. If
+ * you wish to allow use of your version of this file only under the terms of
+ * the GPL and not to allow others to use your version of this file under the
+ * MPL, indicate your decision by deleting the provisions above and replacing
+ * them with the notice and other provisions required by the GPL. If you do
+ * not delete the provisions above, a recipient may use your version of this
+ * file under either the MPL or the GPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.javascript.jdk13;
+
+import java.lang.reflect.AccessibleObject;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationHandler;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.lang.reflect.Member;
+import java.lang.reflect.Proxy;
+
+import org.mozilla.javascript.*;
+
+public class VMBridge_jdk13 extends VMBridge
+{
+    private ThreadLocal<Object[]> contextLocal = new ThreadLocal<Object[]>();
+
+    @Override
+    protected Object getThreadContextHelper()
+    {
+        // To make subsequent batch calls to getContext/setContext faster
+        // associate permanently one element array with contextLocal
+        // so getContext/setContext would need just to read/write the first
+        // array element.
+        // Note that it is necessary to use Object[], not Context[] to allow
+        // garbage collection of Rhino classes. For details see comments
+        // by Attila Szegedi in
+        // https://bugzilla.mozilla.org/show_bug.cgi?id=281067#c5
+
+        Object[] storage = contextLocal.get();
+        if (storage == null) {
+            storage = new Object[1];
+            contextLocal.set(storage);
+        }
+        return storage;
+    }
+
+    @Override
+    protected Context getContext(Object contextHelper)
+    {
+        Object[] storage = (Object[])contextHelper;
+        return (Context)storage[0];
+    }
+
+    @Override
+    protected void setContext(Object contextHelper, Context cx)
+    {
+        Object[] storage = (Object[])contextHelper;
+        storage[0] = cx;
+    }
+
+    @Override
+    protected ClassLoader getCurrentThreadClassLoader()
+    {
+        return Thread.currentThread().getContextClassLoader();
+    }
+
+    @Override
+    protected boolean tryToMakeAccessible(Object accessibleObject)
+    {
+        if (!(accessibleObject instanceof AccessibleObject)) {
+            return false;
+        }
+        AccessibleObject accessible = (AccessibleObject)accessibleObject;
+        if (accessible.isAccessible()) {
+            return true;
+        }
+        try {
+            accessible.setAccessible(true);
+        } catch (Exception ex) { }
+
+        return accessible.isAccessible();
+    }
+
+    @Override
+    protected Object getInterfaceProxyHelper(ContextFactory cf,
+                                             Class<?>[] interfaces)
+    {
+        // XXX: How to handle interfaces array withclasses from different
+        // class loaders? Using cf.getApplicationClassLoader() ?
+        ClassLoader loader = interfaces[0].getClassLoader();
+        Class<?> cl = Proxy.getProxyClass(loader, interfaces);
+        Constructor<?> c;
+        try {
+            c = cl.getConstructor(new Class[] { InvocationHandler.class });
+        } catch (NoSuchMethodException ex) {
+            // Should not happen
+            throw Kit.initCause(new IllegalStateException(), ex);
+        }
+        return c;
+    }
+
+    @Override
+    protected Object newInterfaceProxy(Object proxyHelper,
+                                       final ContextFactory cf,
+                                       final InterfaceAdapter adapter,
+                                       final Object target,
+                                       final Scriptable topScope)
+    {
+        Constructor<?> c = (Constructor<?>)proxyHelper;
+
+        InvocationHandler handler = new InvocationHandler() {
+                public Object invoke(Object proxy,
+                                     Method method,
+                                     Object[] args)
+                {
+                    return adapter.invoke(cf, target, topScope, method, args);
+                }
+            };
+        Object proxy;
+        try {
+            proxy = c.newInstance(new Object[] { handler });
+        } catch (InvocationTargetException ex) {
+            throw Context.throwAsScriptRuntimeEx(ex);
+        } catch (IllegalAccessException ex) {
+            // Shouls not happen
+            throw Kit.initCause(new IllegalStateException(), ex);
+        } catch (InstantiationException ex) {
+            // Shouls not happen
+            throw Kit.initCause(new IllegalStateException(), ex);
+        }
+        return proxy;
+    }
+    
+    @Override
+    protected boolean isVarArgs(Member member) {
+      return false;
+    }
+}