| /* java.lang.VMThrowable -- VM support methods for Throwable. |
| Copyright (C) 1998, 1999, 2002, 2004 Free Software Foundation, Inc. |
| |
| 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., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 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 java.lang; |
| |
| import gnu.gcj.runtime.NameFinder; |
| import gnu.gcj.runtime.StackTrace; |
| |
| /** |
| * VM dependent state and support methods Throwable. |
| * It is deliberately package local and final and should only be accessed |
| * by the Throwable class. |
| * <p> |
| * This is the version used by libgcj (http://gcc.gnu.org/java/). |
| * |
| * @author Mark Wielaard (mark@klomp.org) |
| */ |
| final class VMThrowable |
| { |
| private gnu.gcj.runtime.StackTrace trace; |
| |
| /** |
| * Private contructor, create VMThrowables with fillInStackTrace(); |
| */ |
| private VMThrowable() { } |
| |
| /** |
| * Fill in the stack trace with the current execution stack. |
| * Called by <code>Throwable.fillInStackTrace()</code> to get the state of |
| * the VM. Can return null when the VM does not support caputing the VM |
| * execution state. |
| * |
| * @return a new VMThrowable containing the current execution stack trace. |
| * @see Throwable#fillInStackTrace() |
| */ |
| static VMThrowable fillInStackTrace(Throwable t) |
| { |
| VMThrowable state = null; |
| |
| /* FIXME: size of the stack trace is limited to 128 elements. |
| It's undoubtedly sensible to limit the stack trace, but 128 is |
| rather arbitrary. It may be better to configure this. */ |
| if (trace_enabled) |
| { |
| state = new VMThrowable (); |
| state.trace = new gnu.gcj.runtime.StackTrace(128); |
| } |
| return state; |
| } |
| |
| /** |
| * Returns an <code>StackTraceElement</code> array based on the execution |
| * state of the VM as captured by <code>fillInStackTrace</code>. |
| * Called by <code>Throwable.getStackTrace()</code>. |
| * |
| * @return a non-null but possible zero length array of StackTraceElement. |
| * @see Throwable#getStackTrace() |
| */ |
| StackTraceElement[] getStackTrace(Throwable t) |
| { |
| StackTraceElement[] result; |
| if (trace != null) |
| { |
| NameFinder nameFinder = new NameFinder(); |
| result = nameFinder.lookup(t, trace); |
| nameFinder.close(); |
| } |
| else |
| result = new StackTraceElement[0]; |
| |
| return result; |
| } |
| |
| // Setting this flag to false prevents fillInStackTrace() from running. |
| static boolean trace_enabled = true; |
| } |