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115 lines
3.9 KiB
Java
115 lines
3.9 KiB
Java
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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package netscape.jsdebug;
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/**
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* This interface provides access to the execution stack of a thread.
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* It has several subclasses to distinguish between different kinds of
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* stack frames: these currently include activations of Java methods
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* or JavaScript functions.
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* It is possible that synchronize blocks and try blocks deserve their own
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* stack frames - to allow for later extensions a debugger should skip over
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* stack frames it doesn't understand.
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* Note that this appears very Java-specific. However, multiple threads and
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* exceptions are relevant to JavaScript as well because of its
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* interoperation with Java.
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*
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* @author John Bandhauer
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* @author Nick Thompson
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* @version 1.0
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* @since 1.0
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*/
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public abstract class StackFrameInfo {
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ThreadStateBase threadState;
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StackFrameInfo caller;
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protected StackFrameInfo(ThreadStateBase threadState) {
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this.threadState = threadState;
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}
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/**
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* Return true if this stack frame is still valid. Stack frames
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* may become invalid when the thread is resumed (this is more
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* conservative than invalidating the frame only when it actually
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* returns).
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*/
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public boolean isValid() {
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return threadState.isValid();
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}
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/**
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* Get the stack frame where this one was built, or null for the
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* start of the stack.
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*/
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public synchronized StackFrameInfo getCaller()
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throws InvalidInfoException {
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if (caller == null)
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caller = getCaller0();
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if (!isValid())
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throw new InvalidInfoException("invalid StackFrameInfo");
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return caller;
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}
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protected abstract StackFrameInfo getCaller0()
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throws InvalidInfoException;
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/**
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* Get the thread that this stack frame is a part of.
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*/
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public Thread getThread() {
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return threadState.getThread();
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}
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/**
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* Get the 'enclosing' thread state
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*/
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public ThreadStateBase getThreadState() {
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return threadState;
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}
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/**
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* Get the current program counter value. Note that the
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* class JavaPC supports the getMethod() operation.
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*/
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public abstract PC getPC()
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throws InvalidInfoException;
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}
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