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Aminet - June 1993 [Walnut Creek].iso
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gnu_smalltalk1_2.lha
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Debugger.st
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1992-02-15
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3KB
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86 lines
"======================================================================
|
| Experimental Debugger
|
======================================================================"
"======================================================================
|
| Copyright (C) 1990, 1991, 1992 Free Software Foundation, Inc.
| Written by Steve Byrne.
|
| This file is part of GNU Smalltalk.
|
| GNU Smalltalk 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 1, or (at your option) any later version.
|
| GNU Smalltalk 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 Smalltalk; see the file COPYING. If not, write to the Free Software
| Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
|
======================================================================"
"
| Change Log
| ============================================================================
| Author Date Change
| sbyrne 25 Dec 89 created.
|
"
Object subclass: #Debugger
instanceVariableNames: ''
classVariableNames: 'Breakpoints'
poolDictionaries: ''
category: 'Method debugging'
!
Debugger comment:
'I provide a simple breakpoint facility for GNU Smalltalk. In the future,
I may be expanded to perform inspection, and other useful functions.
One idea would be to have an instance of a debugger created for each method
that has breakpoints, or somehow have the debugger run from a separate
processes that has a higher priority.'!
!Debugger class methodsFor: 'breakpoint management'!
recordOldByte: byte atIndex: anIndex forMethod: aMethod
"I preserve the original byte code from a compiled method, for restoration
after the breakpoint is removed. My implementation does not notice if
the compiled method is shared; so a breakpoint in a compiled method will
cause a break in whichever classes share this method. This does not occur
at all in practice, so it's probably not an issue."
| breakpointDict |
byte == self debugByte
ifTrue: [ ^self ].
breakpointDict _ Breakpoints at: aMethod
ifAbsent: [ Dictionary new ].
breakpointDict at: anIndex put: byte
!
origByteAt: anIndex forMethod: aMethod
"I return the original byte code at the given index for the given method.
If there is no breakpoint for that method at that index, I return nil."
breakpointDict _ Breakpoints at: aMethod
ifAbsent: [ ^nil ].
^breakpointDict at: anIndex
ifAbsent: [ ^nil ]
!!
!Debugger class methodsFor: 'private'!
debugByte
"Answer the byte code that the debugger uses for breakpoints"
^127
!!