+++ /dev/null
-/* VMStackWalker.java -- Reference implementation of VM hooks for stack access
- Copyright (C) 2005 Free Software Foundation
-
-This file is part of GNU Classpath.
-
-GNU Classpath is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU Classpath is distributed in the hope that it will be useful, but
-WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU Classpath; see the file COPYING. If not, write to the
-Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301 USA.
-
-Linking this library statically or dynamically with other modules is
-making a combined work based on this library. Thus, the terms and
-conditions of the GNU General Public License cover the whole
-combination.
-
-As a special exception, the copyright holders of this library give you
-permission to link this library with independent modules to produce an
-executable, regardless of the license terms of these independent
-modules, and to copy and distribute the resulting executable under
-terms of your choice, provided that you also meet, for each linked
-independent module, the terms and conditions of the license of that
-module. An independent module is a module which is not derived from
-or based on this library. If you modify this library, you may extend
-this exception to your version of the library, but you are not
-obligated to do so. If you do not wish to do so, delete this
-exception statement from your version. */
-
-package gnu.classpath;
-
-/**
- * This class provides access to the classes on the Java stack
- * for reflection and security purposes.
- *
- * <p>
- * This class is only available to privileged code (i.e., code loaded
- * by the bootstrap loader).
- *
- * @author John Keiser
- * @author Eric Blake <ebb9@email.byu.edu>
- * @author Archie Cobbs
- */
-public final class VMStackWalker
-{
- /**
- * Get a list of all the classes currently executing methods on the
- * Java stack. <code>getClassContext()[0]</code> is the class associated
- * with the currently executing method, i.e., the method that called
- * <code>VMStackWalker.getClassContext()</code> (possibly through
- * reflection). So you may need to pop off these stack frames from
- * the top of the stack:
- * <ul>
- * <li><code>VMStackWalker.getClassContext()</code>
- * <li><code>Method.invoke()</code>
- * </ul>
- *
- * @return an array of the declaring classes of each stack frame
- */
- public static native Class[] getClassContext();
-
- /**
- * Get the class associated with the method invoking the method
- * invoking this method, or <code>null</code> if the stack is not
- * that deep (e.g., invoked via JNI invocation API). This method
- * is an optimization for the expression <code>getClassContext()[1]</code>
- * and should return the same result.
- *
- * <p>
- * VM implementers are encouraged to provide a more efficient
- * version of this method.
- */
-// public static Class getCallingClass()
-// {
-// Class[] ctx = getClassContext();
-// if (ctx.length < 3)
-// return null;
-// return ctx[2];
-// }
- public static native Class getCallingClass();
-
- /**
- * Get the class loader associated with the Class returned by
- * <code>getCallingClass()</code>, or <code>null</code> if no such class
- * exists or it is the boot loader. This method is an optimization for the
- * expression <code>VMStackWalker.getClassLoader(getClassContext()[1])</code>
- * and should return the same result.
- *
- * <p>
- * VM implementers are encouraged to provide a more efficient
- * version of this method.
- */
-// public static ClassLoader getCallingClassLoader()
-// {
-// Class[] ctx = getClassContext();
-// if (ctx.length < 3)
-// return null;
-// return getClassLoader(ctx[2]);
-// }
- public static native ClassLoader getCallingClassLoader();
-
-
- /**
- * Retrieve the class's ClassLoader, or <code>null</code> if loaded
- * by the bootstrap loader. I.e., this should return the same thing
- * as {@link java.lang.VMClass#getClassLoader}. This duplicate version
- * is here to work around access permissions.
- */
-// public static native ClassLoader getClassLoader(Class cl);
-
- /**
- * Walk up the stack and return the first non-null class loader.
- * If there aren't any non-null class loaders on the stack, return null.
- */
-// public static ClassLoader firstNonNullClassLoader()
-// {
-// Class[] stack = getClassContext();
-// for (int i = 0; i < stack.length; i++)
-// {
-// ClassLoader loader = getClassLoader(stack[i]);
-// if (loader != null)
-// return loader;
-// }
-// return null;
-// }
- public static native ClassLoader firstNonNullClassLoader();
-}
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