1 /* 2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package jdk.internal.reflect; 27 28 import sun.reflect.misc.ReflectUtil; 29 30 import java.lang.reflect.*; 31 32 /** Used only for the first few invocations of a Method; afterward, 33 switches to bytecode-based implementation */ 34 35 class NativeMethodAccessorImpl extends MethodAccessorImpl { 36 private final Method method; 37 private DelegatingMethodAccessorImpl parent; 38 private int numInvocations; 39 40 NativeMethodAccessorImpl(Method method) { 41 this.method = method; 42 } 43 44 public Object invoke(Object obj, Object[] args) 45 throws IllegalArgumentException, InvocationTargetException 46 { 47 // We can't inflate methods belonging to vm-anonymous classes because 48 // that kind of class can't be referred to by name, hence can't be 49 // found from the generated bytecode. 50 if (++numInvocations > ReflectionFactory.inflationThreshold() 51 && !method.getDeclaringClass().isHiddenClass() 52 && !ReflectUtil.isVMAnonymousClass(method.getDeclaringClass())) { 53 MethodAccessorImpl acc = (MethodAccessorImpl) 54 new MethodAccessorGenerator(). 55 generateMethod(method.getDeclaringClass(), 56 method.getName(), 57 method.getParameterTypes(), 58 method.getReturnType(), 59 method.getExceptionTypes(), 60 method.getModifiers()); 61 parent.setDelegate(acc); 62 } 63 64 return invoke0(method, obj, args); 65 } 66 67 void setParent(DelegatingMethodAccessorImpl parent) { 68 this.parent = parent; 69 } 70 71 private static native Object invoke0(Method m, Object obj, Object[] args); 72 }