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