/usr/share/gnu-smalltalk/examples/MiniDebugger.st is in gnu-smalltalk-common 3.2.5-1.
This file is owned by root:root, with mode 0o644.
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|
| Minimal inspector and debugger using DebugTools
|
|
======================================================================"
"======================================================================
|
| Copyright 2002, 2006, 2007 Free Software Foundation, Inc.
| Written by Paolo Bonzini.
|
| 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 2, 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
======================================================================"
PackageLoader fileInPackage: #DebugTools!
Object subclass: #MiniTool
instanceVariableNames: 'commandArg command'
classVariableNames:''
poolDictionaries:''
category: 'Debugging-Support'
!
MiniTool subclass: #MiniInspector
instanceVariableNames: 'inspectedObject depth'
classVariableNames:''
poolDictionaries:''
category: 'Debugging-Support'
!
MiniTool subclass: #MiniDebugger
instanceVariableNames: 'debugger activeContext depth methodSourceCodeCache'
classVariableNames: ''
poolDictionaries: ''
category: 'System-Debugging-Support'
!
MiniInspector comment:
'I implement a primitive inspector which is launched by the MiniDebugger.'!
MiniDebugger comment:
'I implement a primitive (non graphical) debugger for use on systems without
graphics or when the real debugger dies (i.e. an error occurs in the
graphical debugger). The interface is vaguely similar to GDB.'!
!MiniTool class methodsFor: 'disabling debugging'!
debuggerClass
^nil
! !
!MiniTool methodsFor: 'rep loop'!
interpreterLoopWith: anObject
| line |
'read-eval-print loop; exit with empty line
' displayNl.
[
'(rep) ' display.
line := stdin nextLine.
line isEmpty
] whileFalse: [
self eval: line to: anObject
]
!
eval: line to: anObject
| result |
result := Behavior
evaluate: line
to: anObject
ifError: [ :f :l :e | e printNl. ^self ].
result printNl
! !
!MiniTool methodsFor: 'instance creation'!
showPrompt
self subclassResponsibility
!
eofCommand
self subclassResponsibility
!
doCommand
self subclassResponsibility
!
getCommand
| cmd |
self showPrompt.
cmd := stdin atEnd
ifTrue: [ { self eofCommand } ]
ifFalse: [ stdin nextLine substrings ].
cmd isEmpty ifFalse: [
command := (cmd at: 1) at: 1.
commandArg := cmd copyFrom: 2.
"Else repeat the last command."
].
self doCommand ifFalse: [
(command = $h) ifFalse: [ 'invalid command' displayNl ].
self help displayNl
].
!
help
self subclassResponsibility
! !
!MiniInspector class methodsFor: 'instance creation'!
openOn: anObject
self openOn: anObject depth: 0
!
openOn: anObject depth: n
self new initializeFor: anObject depth: n; commandLoop
! !
!MiniInspector methodsFor: 'command loop'!
help
^'inspector commands:
(e)val start read-eval-print loop
(i)nstvars print all instvars
(i)nstvars NUMBER inspect n-th instvar (negative=fixed, positive=indexed)
(p)rint print object
(p)rint NUMBER print n-th instvar (negative=fixed, positive=indexed)
(q)uit'
!
doCommand
(command = $p) ifTrue: [
stdout space: depth.
commandArg isEmpty
ifFalse: [ (self nthInstvar: commandArg first asInteger) printNl ]
ifTrue: [ inspectedObject printNl ].
^true
].
(command = $e) ifTrue: [
self interpreterLoopWith: inspectedObject.
^true
].
(command = $i) ifTrue: [
commandArg isEmpty
ifFalse: [ self inspectInstvar: commandArg first asInteger ]
ifTrue: [ self printInstVarsOf: inspectedObject ].
^true
].
^command = $q
!
eofCommand
^'q'
!
commandLoop
self printHeader.
[
self getCommand.
command = $q
] whileFalse.
!
showPrompt
stdout space: depth.
'(insp) ' display.
! !
!MiniInspector methodsFor: 'commands'!
inspectInstvar: which
self doInspect: (self nthInstvar: which).
self printHeader.
!
printInstVarsOf: anObject
stdout space: depth.
anObject inspect.
! !
!MiniInspector methodsFor: 'private'!
initializeFor: anObject depth: n
inspectedObject := anObject.
depth := n.
^self
!
printHeader
stdout space: depth.
'-- inspector: ' display.
inspectedObject basicPrintNl.
!
doInspect: anObject
self class openOn: anObject depth: depth + 1
!
nthInstvar: which
which < 0
ifTrue: [ ^inspectedObject instVarAt: which negated ].
^inspectedObject basicSize = 0
ifTrue: [ inspectedObject instVarAt: which ]
ifFalse: [ inspectedObject basicAt: which ]
! !
!MiniDebugger class methodsFor: 'class attributes'!
debuggingPriority
^FloatD infinity
! !
!MiniDebugger class methodsFor: 'instance creation'!
open: aString
[ :debugger || continuation arg |
Processor activeProcess name: 'Debugger'.
arg := Continuation currentDo: [ :cc |
continuation := cc.
aString ].
arg printNl.
[ self new debugger: debugger; commandLoop ]
on: SystemExceptions.DebuggerReentered
do: [ :ex | continuation value: ex messageText ]
] forkDebugger
! !
!MiniDebugger methodsFor: 'commands'!
debugger: aDebugger
debugger := aDebugger.
!
commandLoop
"Show meaningful source code to the user."
[ debugger suspendedContext isInternalExceptionHandlingContext ]
whileTrue: [ debugger slowFinish ].
depth := 0.
activeContext := debugger suspendedContext.
debugger suspendedContext backtrace.
self printCurrentLine.
[
self getCommand.
debugger isActive
] whileTrue.
Processor activeProcess suspend
!
!MiniDebugger methodsFor: 'commands'!
step
debugger step.
self resetContext!
next
debugger next.
self resetContext!
finish
debugger finish: activeContext.
self resetContext!
continue
debugger continue!
resetContext
activeContext := debugger suspendedContext.
depth := 0!
up
activeContext parentContext isNil ifTrue: [ ^self ].
activeContext := activeContext parentContext.
depth := depth + 1.
!
down
depth > 0 ifFalse: [ ^self ].
depth := depth - 1.
activeContext := debugger suspendedContext.
depth timesRepeat: [ activeContext := activeContext parentContext ]
! !
!MiniDebugger methodsFor: 'printing'!
printCurrentMethod
| source |
source := self currentMethodSource.
source isNil ifTrue: [ ^self ].
source keysAndValuesDo: [ :line :code |
self rightJustify: line.
stdout
space;
nextPutAll: code;
nl
]
!
printCurrentLine
| line source |
activeContext isNil ifTrue: [ ^self ].
source := self currentMethodSource.
source isNil ifTrue: [ ^self ].
line := Debugger currentLineIn: activeContext.
line = 0 ifTrue: [ ^self ].
self rightJustify: line.
stdout
space;
nextPutAll: (source at: line ifAbsent: [ '' ]);
nl
! !
!MiniDebugger methodsFor: 'user commands'!
doStepCommand
| context arg |
('udsnfc' includes: command) ifFalse: [ ^false ].
context := activeContext.
arg := commandArg at: 1 ifAbsent: [ 1 ].
arg := arg asInteger.
arg timesRepeat: [
(command == $u) ifTrue: [ self up ].
(command == $d) ifTrue: [ self down ].
(command == $s) ifTrue: [ self step ].
(command == $n) ifTrue: [ self next ].
(command == $f) ifTrue: [ self finish ].
(command == $c) ifTrue: [ self continue ].
].
activeContext isNil ifFalse: [
activeContext == context ifFalse: [ activeContext printNl ].
self printCurrentLine ].
^true
!
doProcessCommand
| id processes terminated |
('TSKb' includes: command) ifFalse: [ ^false ].
(commandArg isEmpty and: [ command == $b ]) ifTrue: [
activeContext backtrace.
^true ].
processes := commandArg collect: [ :each || stream proc |
stream := each readStream.
id := Number readFrom: stream.
stream atEnd
ifFalse: [ 'please supply a valid process id' displayNl. ^true ].
proc := id asObject.
(proc isKindOf: Process)
ifFalse: [ 'please supply a valid process id' displayNl. ^true ].
proc ].
processes isEmpty ifTrue: [ processes := {debugger process} ].
terminated := false.
processes do: [ :proc |
proc suspendedContext isNil
ifTrue: [('%1: process was terminated' % { proc asOop }) displayNl]
ifFalse: [
(command == $b) ifTrue: [
processes size > 1 ifTrue: [
('backtrace for process %1' % { proc asOop }) displayNl].
proc context backtrace ].
(command == $S) ifTrue: [ proc suspend ].
(command == $K) ifTrue: [ proc primTerminate ].
(command == $T) ifTrue: [
proc terminate.
terminated := terminated or: [proc == debugger process]]]].
terminated ifTrue: [ self continue ].
^true
!
doCommand
self doStepCommand ifTrue: [ ^true ].
self doProcessCommand ifTrue: [ ^true ].
('PriIelwgxX' includes: command) ifFalse: [ ^false ].
(command == $h) ifTrue: [ ^true ].
commandArg isEmpty
ifFalse: [ 'no argument needed for this command' displayNl. ^true ].
(command == $P) ifTrue: [ self showProcesses ].
(command == $r) ifTrue: [ activeContext receiver printNl ].
(command == $i) ifTrue: [ MiniInspector openOn: activeContext receiver ].
(command == $I) ifTrue: [ MiniInspector openOn: activeContext ].
(command == $e) ifTrue: [ self interpreterLoopWith: activeContext receiver ].
(command == $l) ifTrue: [ self printCurrentMethod ].
(command == $w) ifTrue: [ activeContext printNl. self printCurrentLine ].
(command == $g) ifTrue: [ ObjectMemory globalGarbageCollect ].
(command == $X) ifTrue: [ ObjectMemory abort ].
(command == $x) ifTrue: [ ObjectMemory quit ].
^true
!
eofCommand
^'T'
!
showPrompt
'(debug) ' display.
!
help
^'Control flow commands:
s [n] step N times
n [n] next (step over send) N times
f [n] finish current method N times
c continue
Process commands: no ID means debugged process
P show process list
T [id]... terminate process
K [id]... kill process - no unwinds or cleanup
b [id]... backtrace
Examining state:
r print receiver on stdout
i inspect (enter MiniInspector on current receiver)
I inspect context (enter MiniInspector on current context)
e eval (enter read-eval-print loop on current receiver)
Examining the call stack:
u [n] go N frames up (default 1)
d [n] go N frames down (default 1)
l print current method
w print current frame
Other commands:
g collect all garbage
X exit Smalltalk, and dump core
x exit Smalltalk'
! !
!MiniDebugger methodsFor: 'private'!
currentMethodSource
activeContext isNil ifTrue: [ ^#() ].
methodSourceCodeCache isNil ifTrue: [
methodSourceCodeCache := WeakKeyIdentityDictionary new ].
^methodSourceCodeCache at: activeContext method ifAbsentPut: [
activeContext method methodSourceString lines ]
!
rightJustify: n
| printString |
printString := n printString.
stdout
space: (7 - printString size max: 0);
nextPutAll: printString
!
showProcesses
self rightJustify: debugger process asOop.
'>' display.
debugger process printNl.
Process allSubinstancesDo: [ :each |
each == debugger process ifFalse: [
self rightJustify: each asOop.
' ' display.
each printNl ] ]
! !
!UndefinedObject methodsFor: 'polymorphism'!
lines
^nil
! !
!Behavior methodsFor: 'debugging'!
debuggerClass
^MiniDebugger
! !
|