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 
  30 import jdk.internal.misc.Strands;
  31 import jdk.internal.misc.VM;
  32 import sun.reflect.misc.ReflectUtil;
  33 
  34 /** Used only for the first few invocations of a Constructor;
  35     afterward, switches to bytecode-based implementation */
  36 
  37 class NativeConstructorAccessorImpl extends ConstructorAccessorImpl {
  38     private final Constructor<?> c;
  39     private DelegatingConstructorAccessorImpl parent;
  40     private int numInvocations;
  41 
  42     NativeConstructorAccessorImpl(Constructor<?> c) {
  43         this.c = c;
  44     }
  45 
  46     public Object newInstance(Object[] args)
  47         throws InstantiationException,
  48                IllegalArgumentException,
  49                InvocationTargetException
  50     {
  51         // We can't inflate a constructor belonging to a vm-anonymous class
  52         // because that kind of class can't be referred to by name, hence can't
  53         // be found from the generated bytecode.
  54         if (VM.isBooted() && (++numInvocations > ReflectionFactory.inflationThreshold()
  55                 || Strands.currentStrand() instanceof Fiber)
  56                     && !ReflectUtil.isVMAnonymousClass(c.getDeclaringClass())) {
  57             ConstructorAccessorImpl acc = (ConstructorAccessorImpl)
  58                 new MethodAccessorGenerator().
  59                     generateConstructor(c.getDeclaringClass(),
  60                                         c.getParameterTypes(),
  61                                         c.getExceptionTypes(),
  62                                         c.getModifiers());
  63             parent.setDelegate(acc);
  64             return acc.newInstance(args);
  65         }
  66 
  67         return newInstance0(c, args);
  68     }
  69 
  70     void setParent(DelegatingConstructorAccessorImpl parent) {
  71         this.parent = parent;
  72     }
  73 
  74     private static native Object newInstance0(Constructor<?> c, Object[] args)
  75         throws InstantiationException,
  76                IllegalArgumentException,
  77                InvocationTargetException;
  78 }