"

 COPYRIGHT (c) 1989 by Claus Gittinger

              All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

"{ Package: 'stx:libtool' }"

StandardSystemView subclass:#DebugView

	instanceVariableNames:'busy haveControl exitAction canContinue contextView codeView

		receiverInspector contextInspector contextArray selectedContext

		catchBlock grabber mayProceed traceView tracing bigStep

		skipLineNr steppedContextAddress abortButton terminateButton

		continueButton stepButton nextButton nextOverButton nextOutButton

		sendButton returnButton restartButton exclusive inspecting

		nChainShown inspectedProcess updateProcess stopButton

		updateButton defineButton monitorToggle stepping

		steppedContextLineno stepForReturn actualContext inWrap

		stackInspector steppedContext wrapperContext verboseBacktrace

		firstContext stepHow cachable currentMethod ignoreBreakpoints

		stepUntilEntering lastStepUntilEntering

		lastSelectionInReceiverInspector lastSelectionInContextInspector

		canShowMore exitAbort reportButton setOfHiddenCallingSelectors

		isStoppedAtHaltOrBreakPoint exceptionInfoLabel'

	classVariableNames:'CachedDebugger CachedExclusive OpenDebuggers MoreDebuggingDetail

		DebuggingDebugger DefaultDebuggerBackgroundColor

		InitialNChainShown IgnoredHalts'

	poolDictionaries:''

	category:'Interface-Debugger'

!

Object subclass:#IgnoredHalt

	instanceVariableNames:'weakMethodHolder lineNumber ignoreEndTime ignoreCount'

	classVariableNames:''

	poolDictionaries:''

	privateIn:DebugView

!

!DebugView class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1989 by Claus Gittinger

              All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

!

documentation

"

    This class implements a graphical debugger interface.

    The debugger usually sits on top of the faulting process,

    taking over its event processing. 

    (this is different from other Smalltalk debuggers, which control

     the debuggee as a separate process. Consider this an historic

     leftover - the debugger was one of the first applications written for

     ST/X; however, why should we change it without a particular need ...).

    Only the 'stopped' debugged process is affected;

    other processes continue to respond to events.

    The one exception is when an error occurs within the dispatcher process

    or in one of the eventhandler processes - in this case, the debugger

    will sit on an exclusive display connection.

    The whole debugging will be changed, once the required process primitives

    are available, which allow control of another processes execution

    (i.e. single-step, restart & return). The setup will be changed then,

    to have the debugger control the debuggee (i.e. two processes)

    See additional information in 'doc/misc/debugger.doc'.

    Notice: 

        the DebugView class caches the last used debugger in a class

        variable. It may happen, that a malfunctioning debugger (for example,

        a halfway destroyed one) is kept there. You will notice this, if a

        debugger comes up without showing any contents. In this case, close

        (or destroy) the broken debugView, and execute

            Debugger newDebugger

        which removes the cached debugger and forces creation of a new one the

        next time. This is a temporary workaround - the debugger will be fixed to

        avoid this problem.

        You also have to remove the cached debugger, if you change the debugger's 

        initialization code (buttons, menu, etc.) and you want the new code to become

        effective.

    [author:]

        Claus Gittinger

    [see also:]

        Exception Signal

        Process

"

! !

!DebugView class methodsFor:'initialization'!

initialize

    InitialNChainShown := 50.

    "/ DefaultDebuggerBackgroundColor := nil.

    "/ DefaultDebuggerBackgroundColor := Color red lightened.

    "/ DefaultDebuggerBackgroundColor := Color blue lightened lightened.

    "Created: 20.3.1997 / 16:53:37 / cg"

    "Modified: 20.3.1997 / 16:54:32 / cg"

!

reinitialize

    "reinitialize after an image-restart"

    self newDebugger

! !

!DebugView class methodsFor:'instance creation'!

enter

    "enter a debugger"

    <context: #return>

    ^ self 

        enter:thisContext sender 

        withMessage:'debugger entered'  

        mayProceed:true.

!

enter:aContext withMessage:aString 

    "enter a debugger"

    <context: #return>

    ^ self

        enter:aContext 

        withMessage:aString 

        mayProceed:true

!

enter:aContext withMessage:aString mayProceed:mayProceed

    "enter a debugger; if this is a recursive invocation, enter

     a MiniDebugger instead.

     This is the standard way of entering the debugger;

     sent from error- and halt messages."

    <context: #return>

    |active|

    StepInterruptPending := nil.

    ControlInterrupt handle:[:ex |

        'DebugView [info]: breakpoint in debugger setup ignored [enter.]' infoPrintCR.

        ('DebugView [info]: breakpoint on:' , ex suspendedContext printString) infoPrintCR.

        ex proceed

    ] do:[

        "

         well, it could be a stepping or sending debugger up there;

         in this case, return to it. This happens, when a stepping process

         runs into an error (for example, a halt). In this case, we want the

         stepping debugger to come up again instead of a new one.

        "

        OpenDebuggers notNil ifTrue:[

            active := Processor activeProcess.

            OpenDebuggers do:[:aDebugger |

                (aDebugger notNil and:[aDebugger ~~ 0]) ifTrue:[

                    (aDebugger inspectedProcess == active) ifTrue:[

                        aDebugger device isOpen ifTrue:[

                            "/ 'entering stepping debugger again' printNL.

                            aDebugger unstep.

                            aDebugger setLabelFor:aString in:active.

                            aDebugger mayProceed:mayProceed.

                            ^ aDebugger enter:aContext select:nil.

                        ]

                    ]

                ]

            ]

        ].

    ].

    ^ self enterUnconditional:aContext withMessage:aString mayProceed:mayProceed

    "Modified: / 18.11.2001 / 00:48:03 / cg"

!

enterException:ex

    "enter a debugger; if this is a recursive invocation, enter

     a MiniDebugger instead.

     This is the standard way of entering the debugger;

     sent from error- and halt messages."

    ^ self

        enter:ex returnableSuspendedContext

        withMessage:ex descriptionForDebugger

        mayProceed:(ex mayProceed).

!

enterUnconditional:aContext withMessage:aString mayProceed:mayProceed

    "enter a debugger - do not check for recursive invocation"

    <context: #return>

    |aDebugger|

    StepInterruptPending := nil.

    "/ ignore halts & breakpoints while setting up the debugger

    "/ to avoid recursive debugging ...

    ControlInterrupt handle:[:ex |

        'DebugView [info]: breakpoint in debugger setup ignored [enterUncond.]' infoPrintCR.

        ('DebugView [info]: breakpoint on:' , ex suspendedContext printString) infoPrintCR.

        ex proceed

    ] do:[

        aDebugger := self new.

    ].

    aDebugger isNil ifTrue:[

        'DebugView [error]: cannot open debugger' errorPrintCR.

        'DebugView [error]: Exception: ' errorPrint. aString errorPrintCR.

        mayProceed ifTrue:[

            (Dialog confirm:'Error/Breakpoint cought.\\Press Continue or Abort.' withCRs

                   yesLabel:'Continue' noLabel:'Abort')

            ifTrue:[

                ^ nil

            ].

        ] ifFalse:[

            self information:'Error cought.\\Press OK to abort the operation.' withCRs.

        ].

        AbortOperationRequest raise.

        "not reached"

    ].

    aDebugger mayProceed:mayProceed.

    aDebugger setLabelFor:aString in:Processor activeProcess.

    aDebugger enter:aContext select:nil.

    ^ nil.

    "

        nil halt

    "

    "Modified: / 18.11.2001 / 00:29:23 / cg"

!

enterWithMessage:message

    "enter a debugger"

    <context: #return>

    ^ self 

        enter:(thisContext sender) 

        withMessage:message 

        mayProceed:true.

!

new

    "return a new DebugView. 

     - return a cached debugger if it already exists.

     Also, care for remote displays on which no debugger is wanted

     (ask with mayOpenDebugger) - if so, open on the default screen."

    |debugger currentScreen debuggerDevice|

    currentScreen := Screen current.

    currentScreen notNil ifTrue:[

        (currentScreen suppressDebugger) ifTrue:[

            "/ no debuggers with that device - show an alertBox which aborts...

            ^ nil.

        ].

        (currentScreen mayOpenDebugger) ifFalse:[

            "/ no debugger on that device - but on the main screen

            currentScreen := Screen default.

        ].

    ].

    "

     need a blocking debugger if no processes or 

     or if its a timing/interrupt process 

     (because otherwise we would not get any events here ...

    "

    Processor activeProcessIsSystemProcess ifTrue:[

        ((debugger := CachedExclusive) isNil 

        or:[debugger device ~~ currentScreen

        or:[currentScreen isNil

        or:[currentScreen isOpen not]]]) ifTrue:[

            debugger := self newExclusive

        ].

        CachedExclusive := nil.

    ] ifFalse:[

        CachedDebugger notNil ifTrue:[

            (CachedDebugger device ~~ currentScreen 

            or:[currentScreen isNil

            or:[currentScreen isOpen not

            or:[CachedDebugger class ~~ self]]]) ifTrue:[

                CachedDebugger := nil

            ]

        ].

        (debugger := CachedDebugger) notNil ifTrue:[

            CachedDebugger := nil.

        ] ifFalse:[

            debuggerDevice := currentScreen.

            debuggerDevice isNil ifTrue:[

                "/ use the default display

                debuggerDevice := Screen default.

            ].

            (debuggerDevice isNil

            or:[debuggerDevice isOpen not

            "/ or:[debuggerDevice mayOpenDebugger not]

            ]) ifTrue:[

                "/ no debugger

                ^ nil.

            ].

            Screen currentScreenQuerySignal answer:debuggerDevice

            do:[

                debugger := super new.

            ].

            debugger label:'Debugger'.

            debugger icon:self defaultIcon.

        ]

    ].

    ^ debugger

    "Modified: 31.7.1997 / 21:20:27 / cg"

!

newExclusive

    "return a debugger for exclusive display access"

    |debugger|

    debugger := super new.

    debugger label:'Debugger'.

    debugger icon:self defaultIcon.

    debugger exclusive:true.

    ^ debugger

    "Modified: 1.1.1970 / 23:27:06 / cg"

!

openOn:aProcess

    "start a  debugger on aProcess

     (actually not more than a good-looking inspector)"

    |aDebugger label nm|

    aDebugger := super new.

    aDebugger icon:self defaultIcon.

    aProcess notNil ifTrue:[

        nm := aProcess name.

        nm notNil ifTrue:[

            nm := (nm contractTo:17) , '-' , aProcess id printString

        ] ifFalse:[

            nm := aProcess id printString

        ].

        label := 'Debugger [' , nm , ']'.

    ] ifFalse:[

        label := 'no process'

    ].

    aDebugger label:label iconLabel:'Debugger'.

    aDebugger openOn:aProcess.

    ^ nil

    "Modified: 4.4.1997 / 16:22:36 / cg"

! !

!DebugView class methodsFor:'cleanup'!

lowSpaceCleanup 

    "in low memory situations, give up cached debuggers"

    CachedDebugger := nil.

    CachedExclusive := nil.

    OpenDebuggers := nil.

    "

     DebugView lowSpaceCleanup

    "

    "Modified: 18.4.1996 / 16:48:03 / cg"

!

newDebugger

    "force creation of a new debugger (give up cached debuggers)"

    CachedDebugger := nil.

    CachedExclusive := nil.

    OpenDebuggers := nil.

    (Debugger isBehavior and:[Debugger name = #DebugView]) ifTrue:[

        Debugger := self

    ].

    "

     DebugView newDebugger

    "

! !

!DebugView class methodsFor:'defaults'!

defaultIcon

    "return the browsers default window icon"

    <resource: #programImage>

    ^ ToolbarIconLibrary debug22x22Icon    

    "/ ^ ToolbarIconLibrary debugIt20x20Icon

    "Modified: / 11-02-2007 / 11:47:20 / cg"

!

defaultIconForAboutBox

    <resource: #programImage>

    ^ ToolbarIconLibrary debug22x22IconForBlackBackgound    

!

defaultVerboseBacktrace

    <resource: #obsolete>

    self obsoleteMethodWarning.

    ^ UserPreferences current verboseBacktraceInDebugger

    "Created: 11.1.1997 / 12:14:35 / cg"

!

defaultVerboseBacktrace:aBoolean

    <resource: #obsolete>

    self obsoleteMethodWarning.

    UserPreferences current verboseBacktraceInDebugger:aBoolean

!

updateStyleCache

    "extract values from the styleSheet and cache them in class variables"

    <resource: #style (#'debugView.viewBackgroundColor')>

    DefaultDebuggerBackgroundColor := StyleSheet at:#'debugView.viewBackgroundColor'

    "Modified: / 17.11.2001 / 17:31:42 / cg"

! !

!DebugView class methodsFor:'ignoring halts'!

haltIgnoreInformationFor:haltingMethod atLineNr:lineNrInHaltingMethod

    "the information (if any) about the ignore-state of a halt"

    IgnoredHalts isNil ifTrue:[^ nil].

    IgnoredHalts do:[:ign | 

        (ign isHaltIgnoredInMethod:haltingMethod line:lineNrInHaltingMethod) ifTrue:[

            ^ ign

        ].

    ].

    ^ nil.

!

hasIgnoredHalts

    self removeInactiveIgnores.

    ^ IgnoredHalts notEmptyOrNil

!

ignoreHaltIn:haltingMethod at:lineNrOfHalt forCount:countOrNil orTimeDuration:dTOrNil

    "remember to ignore a halt in some method for some number of invocations

     or until some time has elapsed.

     With nil count and time arguments, such an ignored halt is reactivated"

    |oldEntry ign|

    IgnoredHalts notNil ifTrue:[

        self removeInactiveIgnores.

        oldEntry := IgnoredHalts 

                        detect:[:ign | ign isForMethod:haltingMethod line:lineNrOfHalt]

                        ifNone:nil.

        oldEntry notNil ifTrue:[

            IgnoredHalts remove:oldEntry ifAbsent:[].

        ]