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104 lines
3.2 KiB
Java
104 lines
3.2 KiB
Java
/*
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* @(#) $(JCGO)/goclsp/vm/gnu/classpath/VMStackWalker.java --
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* VM specific methods for Java stack access.
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**
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* Project: JCGO (http://www.ivmaisoft.com/jcgo/)
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* Copyright (C) 2001-2007 Ivan Maidanski <ivmai@ivmaisoft.com>
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* All rights reserved.
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**
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* Class specification origin: GNU Classpath v0.93 vm/reference
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*/
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/*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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**
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* This software is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License (GPL) for more details.
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**
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* Linking this library statically or dynamically with other modules is
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* making a combined work based on this library. Thus, the terms and
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* conditions of the GNU General Public License cover the whole
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* combination.
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**
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* As a special exception, the copyright holders of this library give you
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* permission to link this library with independent modules to produce an
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* executable, regardless of the license terms of these independent
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* modules, and to copy and distribute the resulting executable under
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* terms of your choice, provided that you also meet, for each linked
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* independent module, the terms and conditions of the license of that
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* module. An independent module is a module which is not derived from
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* or based on this library. If you modify this library, you may extend
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* this exception to your version of the library, but you are not
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* obligated to do so. If you do not wish to do so, delete this
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* exception statement from your version.
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*/
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package gnu.classpath;
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public final class VMStackWalker
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{
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private VMStackWalker() {}
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public static Class[] getClassContext()
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{
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Class caller = getCallingClassAt0(1);
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if (caller == null)
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return new Class[] { Object.class }; /* hack */
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Class[] context = new Class[10];
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int count = 0;
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do
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{
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if (context.length <= count)
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{
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Class[] newContext = new Class[(count >> 1) + count];
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System.arraycopy(context, 0, newContext, 0, count);
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context = newContext;
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}
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context[count++] = caller;
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} while ((caller = getCallingClassAt0(count + 1)) != null);
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if (context.length > count)
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{
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Class[] newContext = new Class[count];
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System.arraycopy(context, 0, newContext, 0, count);
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context = newContext;
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}
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return context;
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}
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public static Class getCallingClass()
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{
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return getCallingClassAt0(2);
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}
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public static ClassLoader getCallingClassLoader()
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{
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Class caller = getCallingClassAt0(2);
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return caller != null ? getClassLoader(caller) : null;
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}
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public static ClassLoader getClassLoader(Class klass)
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{
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if (klass == null)
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throw new NullPointerException();
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return VMAccessorJavaLang.getClassLoaderVMClass(klass);
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}
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public static ClassLoader firstNonNullClassLoader()
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{
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ClassLoader loader = null;
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Class caller;
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for (int depth = 2; (caller = getCallingClassAt0(depth)) != null; depth++)
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if ((loader = getClassLoader(caller)) != null)
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break;
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return loader;
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}
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private static native Class getCallingClassAt0(int depth); /* JVM-core */
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}
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