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 java.lang.reflect.*; 29 import sun.reflect.misc.ReflectUtil; 30 31 /** Used only for the first few invocations of a Method; afterward, 32 switches to bytecode-based implementation */ 33 34 class NativeMethodAccessorImpl extends MethodAccessorImpl { 35 private final Method method; 36 private DelegatingMethodAccessorImpl parent; 37 private int numInvocations; 38 39 NativeMethodAccessorImpl(Method method) { 40 this.method = method; 41 } 42 43 public Object invoke(Object obj, Object[] args) 44 throws IllegalArgumentException, InvocationTargetException 45 { 46 // We can't inflate methods belonging to vm-anonymous classes because 47 // that kind of class can't be referred to by name, hence can't be 48 // found from the generated bytecode. 49 if (++numInvocations > ReflectionFactory.inflationThreshold() 50 && !ReflectUtil.isVMAnonymousClass(method.getDeclaringClass())) { 51 MethodAccessorImpl acc = (MethodAccessorImpl) 52 new MethodAccessorGenerator(). 53 generateMethod(method.getDeclaringClass(), 54 method.getName(), 55 method.getParameterTypes(), 56 method.getReturnType(), 57 method.getExceptionTypes(), 58 method.getModifiers()); 59 parent.setDelegate(acc); 60 } 61 62 return invoke0(method, obj, args); 63 } 64 65 void setParent(DelegatingMethodAccessorImpl parent) { 66 this.parent = parent; 67 } 68 69 private static native Object invoke0(Method m, Object obj, Object[] args); 70 }