author | Claus Gittinger <cg@exept.de> |
Fri, 08 Jul 2005 23:13:39 +0200 | |
changeset 8919 | 707a9ff7f9b2 |
parent 8678 | 41d332006a49 |
child 8949 | e43390dadfd7 |
permissions | -rw-r--r-- |
4554 | 1 |
" |
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COPYRIGHT (c) 1999 by eXept Software AG |
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All Rights Reserved |
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This software is furnished under a license and may be used |
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only in accordance with the terms of that license and with the |
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inclusion of the above copyright notice. This software may not |
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be provided or otherwise made available to, or used by, any |
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other person. No title to or ownership of the software is |
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hereby transferred. |
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" |
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6210
d7039e2ae776
caetgory change and documentation added
Claus Gittinger <cg@exept.de>
parents:
5295
diff
changeset
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"{ Package: 'stx:libbasic' }" |
d7039e2ae776
caetgory change and documentation added
Claus Gittinger <cg@exept.de>
parents:
5295
diff
changeset
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4528 | 17 |
GenericException subclass:#NoHandlerError |
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instanceVariableNames:'' |
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classVariableNames:'EmergencyHandler' |
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poolDictionaries:'' |
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caetgory change and documentation added
Claus Gittinger <cg@exept.de>
parents:
5295
diff
changeset
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category:'Kernel-Exceptions-Errors' |
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! |
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!NoHandlerError class methodsFor:'documentation'! |
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copyright |
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" |
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COPYRIGHT (c) 1999 by eXept Software AG |
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All Rights Reserved |
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This software is furnished under a license and may be used |
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only in accordance with the terms of that license and with the |
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inclusion of the above copyright notice. This software may not |
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be provided or otherwise made available to, or used by, any |
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other person. No title to or ownership of the software is |
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hereby transferred. |
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" |
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! |
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documentation |
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" |
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NoHandlerError is raised, if there is no exception handler |
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or default action for an exception. |
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The parameter is the unhandled exception. |
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[Class variables:] |
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EmergencyHandler <Block> this block is evaluated, if no handler was defined |
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for a signal (i.e. this one is responsible for the |
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unhandled exception debugger). |
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Having this being a block allows to globally catch |
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these errors - even when no enclosing handler-scope |
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around the erronous code exists. |
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(as the catch/through does). |
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[see also:] |
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GenericException |
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(``Exception handling and signals'': programming/exceptions.html) |
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" |
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! |
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examples |
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" |
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The emergencyHandler stuff is very useful, to prevent endUser applications |
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from entering the debugger. |
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Some commonly used (useful) emergency handlers are provided in the |
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'useful handlers' section; try them to learn more |
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(especially, the mailingHandler is fun). |
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Of course, these are only examples - you may define your own handler |
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block and pass it to the #emergencyHandler: method. |
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BTW: the Launchers 'source & debugger' settings menu allows you |
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to install either a default or the notifying handler. |
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A handler which shows a box, then aborts - (no more debuggers): |
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[exBegin] |
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NoHandlerError emergencyHandler:(NoHandlerError abortingEmergencyHandler) |
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[exEnd] |
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A handler which aborts - (no box, no debugger): |
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[exBegin] |
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NoHandlerError emergencyHandler:[:ex | AbortSignal raise] |
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[exEnd] |
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try some exception (for demonstration, in some other process): |
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[exBegin] |
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[ |
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#(1 2 3) at:4 |
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] fork. |
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[exEnd] |
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cleanup (switch back to the regular handler, which enters the debugger): |
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[exBegin] |
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NoHandlerError emergencyHandler:nil |
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[exEnd] |
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A handler which shows a warnBox and asks for debugging: |
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[exBegin] |
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NoHandlerError emergencyHandler:(NoHandlerError notifyingEmergencyHandler) |
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[exEnd] |
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A handler which dumps information to a file (watch the file 'errorTrace.stx'): |
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[exBegin] |
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NoHandlerError emergencyHandler:(NoHandlerError dumpingEmergencyHandler) |
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[exEnd] |
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A handler which sends you mail: |
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[exBegin] |
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NoHandlerError emergencyHandler:(NoHandlerError mailingEmergencyHandler) |
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[exEnd] |
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" |
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! ! |
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!NoHandlerError class methodsFor:'initialization'! |
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initialize |
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NotifierString := 'unhandled exception'. |
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" |
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self initialize |
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" |
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! ! |
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!NoHandlerError class methodsFor:'accessing emergencyHandler'! |
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emergencyHandler |
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"return the handler used for unhandled exceptions. |
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If no EmergencyHandler has been set, a handler which enters the |
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debugger is returned. |
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The debugger is opened by asking the signal for a debug action, |
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this allows to provide other debuggers in specialized (subclass-instances) |
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of Signal (if that is ever needed)" |
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" |
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set it up, when called the first time |
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" |
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EmergencyHandler isNil ifTrue:[ |
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EmergencyHandler := [:ex | |
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" |
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sending it to the signal allows per-signal specific |
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debuggers to be implemented in the future |
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(for example, segv in primitive code could show things |
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on the C-level ..) |
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" |
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ex signal openDebuggerOnException:ex. |
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"if we arrive here, the debugger did proceed. |
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the value returned by #openDebuggerOnException: is the exceptions value ..." |
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] |
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]. |
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^ EmergencyHandler |
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! |
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emergencyHandler:aOneArgBlock |
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"set the handler used for unhandled exceptions. |
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The default (a nil-handler) leads to a debugger to be shown." |
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EmergencyHandler := aOneArgBlock |
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"ST-80 behavior of first showing a notifier: |
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(I prefer to get right into the debugger, though) |
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NoHandlerError |
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emergencyHandler: |
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[:ex | self errorNotify:ex description ] |
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" |
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"ST-X behavior of going right into the debugger: |
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NoHandlerError |
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emergencyHandler:nil |
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" |
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"automatically aborting current operation, on error: |
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(may be useful for end-user apps; make certain, |
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you have abortSignal handlers at appropriate places) |
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NoHandlerError |
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emergencyHandler: |
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[:ex | AbortOperationRequest raise. ex return. ] |
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" |
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"finally, traditional language system behavior; dump core ;-) |
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NoHandlerError |
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emergencyHandler: |
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[:ex | Smalltalk exitWithCoreDump. ] |
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" |
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"Modified: 15.1.1997 / 20:49:06 / cg" |
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! ! |
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!NoHandlerError class methodsFor:'useful emergency handlers'! |
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abortingEmergencyHandler |
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"return a block (usable as an emergency handler), |
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which aborts after showing a warnBox. |
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This is useful for endUser applications." |
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^ [:ex | self warn:'Error: ' , ex description. |
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AbortOperationRequest raise |
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] |
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"test with (try a few halts or CTRL-C's): |
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NoHandlerError emergencyHandler:(NoHandlerError abortingEmergencyHandler) |
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" |
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"back with: |
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NoHandlerError emergencyHandler:(NoHandlerError notifyingEmergencyHandler) |
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NoHandlerError emergencyHandler:nil |
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" |
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"Created: 15.1.1997 / 20:13:06 / cg" |
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"Modified: 15.1.1997 / 20:15:02 / cg" |
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! |
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dumpingEmergencyHandler |
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"return a block (usable as an emergency handler), |
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which dumps the stackBacktrace to a trace file and |
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aborts after showing a warnBox. |
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This is useful, for endUser application, which are still being |
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debugged (i.e. the programmers may have a look at the traceFile |
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from time to time). |
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Notice: |
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The code below is just an example; you may want to change the |
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name of the error-file in your application |
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(but please: copy the code; do not modify here)" |
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^ [:ex | |
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|str printedException| |
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ex signal == NoHandlerError ifTrue:[ |
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printedException := ex unhandledException. |
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] ifFalse:[ |
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printedException := ex |
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]. |
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"/ user interruption is handled specially: |
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"/ allow user to choose between proceeding or aborting |
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"/ but never dump that information to the file. |
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printedException signal == Object userInterruptSignal ifTrue:[ |
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(self confirm:'abort current action ?') ifTrue:[ |
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AbortOperationRequest raise |
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]. |
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ex proceedWith:nil |
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]. |
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"/ |
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"/ dump it to 'errorTrace.stx' |
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"/ |
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str := 'errorTrace.stx' asFilename appendingWriteStream. |
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str nextPutLine:('******************************* ' |
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, Timestamp now printString |
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, ' *******************************'). |
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str cr. |
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str nextPutLine:('** Error: ' , printedException description). |
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str nextPutLine:('** Signal: ' , printedException signal printString). |
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str nextPutLine:('** Parameter: ' , printedException parameter printString). |
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str nextPutLine:('** Process: ' , Processor activeProcess printString). |
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str nextPutLine:('** Backtrace:'). |
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str cr. |
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printedException suspendedContext fullPrintAllOn:str. |
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str cr. |
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str cr. |
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str close. |
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"/ send a line to stdErr |
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('[warning]: ignored error: ' , printedException description) errorPrintCR. |
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('[warning]: error information appended to ''errorTrace.stx''') errorPrintCR. |
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AbortOperationRequest raise |
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] |
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"test with (try a few halts or CTRL-C's): |
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NoHandlerError emergencyHandler:(NoHandlerError dumpingEmergencyHandler) |
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" |
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"back with: |
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NoHandlerError emergencyHandler:(NoHandlerError notifyingEmergencyHandler) |
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NoHandlerError emergencyHandler:nil |
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" |
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"Created: / 15.1.1997 / 20:14:52 / cg" |
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"Modified: / 24.1.1997 / 20:36:21 / cg" |
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"Modified: / 4.8.1999 / 08:11:20 / stefan" |
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! |
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mailingEmergencyHandler |
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"return a block (usable as an emergency handler), |
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which shows a warnBox and optionally mails a stackBacktrace to a maintainer. |
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This is useful, for endUser application, which are still being |
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debugged (i.e. the programmers may have a look at the errors). |
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Notice: the stuff here is a demonstration only; it should be modified |
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for your particular environment ... |
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... but please: copy the code and modify there; |
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leave the stuff below as it is." |
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^ [:ex | |
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|str printedException doMail emergencyMailReceiver pipe| |
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ex signal == NoHandlerError ifTrue:[ |
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printedException := ex unhandledException. |
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] ifFalse:[ |
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printedException := ex |
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]. |
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"/ user interruption is handled specially: |
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"/ allow user to choose between proceeding or aborting |
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"/ but never dump that information to the file. |
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printedException signal == UserInterrupt ifTrue:[ |
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(self confirm:'abort current action ?') ifTrue:[ |
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AbortOperationRequest raise |
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]. |
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ex proceedWith:nil |
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]. |
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"/ somehow get the name of the guy to receive the mail |
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"/ you have to implement that yourself. |
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"/ emergencyMailReceiver := OneOfYourClass getEmergencyMailReceiver. |
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emergencyMailReceiver := OperatingSystem getLoginName. |
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emergencyMailReceiver isNil ifTrue:[ |
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self warn:(printedException description |
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, '\\No mailing to service people possible.') withCRs. |
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doMail := false. |
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] ifFalse:[ |
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doMail := self confirm:(printedException description |
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, '\\Mail error information to the service people (' |
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, emergencyMailReceiver , ') ?') withCRs |
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]. |
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doMail ifTrue:[ |
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str := '' writeStream. |
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str nextPutLine:('Error notification from ' |
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, OperatingSystem getLoginName |
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, '@' |
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, OperatingSystem getHostName). |
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str cr. |
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str nextPutLine:('Time: ' , Timestamp now printString). |
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str nextPutLine:('Error: ', printedException description). |
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str nextPutLine:('Signal: ', printedException signal printString). |
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str nextPutLine:('Parameter: ', printedException parameter printString). |
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str nextPutLine:('Process: ', Processor activeProcess printString). |
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str nextPutLine:'Backtrace:'. |
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str cr. |
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printedException suspendedContext fullPrintAllOn:str. |
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str cr;cr. |
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str close. |
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pipe := PipeStream |
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writingTo:'mail ', emergencyMailReceiver. |
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pipe notNil ifTrue:[ |
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pipe nextPutLine:'Subject: automatic error report'. |
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pipe nextPutAll:str contents. |
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pipe cr. |
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pipe close. |
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] |
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]. |
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AbortOperationRequest raise. |
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"not reached" |
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] |
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"test with (try a few halts or CTRL-C's): |
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NoHandlerError emergencyHandler:(NoHandlerError mailingEmergencyHandler) |
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" |
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"back with: |
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NoHandlerError emergencyHandler:(NoHandlerError notifyingEmergencyHandler) |
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NoHandlerError emergencyHandler:nil |
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" |
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405 |
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"Created: / 15.1.1997 / 20:14:52 / cg" |
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"Modified: / 15.1.1997 / 21:10:28 / cg" |
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"Modified: / 4.8.1999 / 08:11:26 / stefan" |
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! |
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notifyingEmergencyHandler |
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"return a block (usable as an emergency handler for exceptions), |
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which does errorNotification before going into the debugger. |
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Halts and breakpoints go directly into the debugger (without asking)" |
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415 |
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416 |
^ [:ex | |
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(ex signal == NoHandlerError |
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and:[ex unhandledException signal inheritsFrom:ControlInterrupt]) ifTrue:[ |
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"/ go directly into the debugger ... |
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420 |
^ Debugger |
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enter:ex suspendedContext |
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withMessage:ex description |
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mayProceed:true |
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] ifFalse:[ |
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"/ ask, and maybe go into the debugger ... |
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^ nil |
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errorNotify:ex description |
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from:ex suspendedContext |
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allowDebug:true |
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] |
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431 |
] |
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432 |
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433 |
"test with (NOTE: halt, breakpoints or CTRL-C's still go straight into the debugger): |
|
434 |
NoHandlerError emergencyHandler:(NoHandlerError notifyingEmergencyHandler). |
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435 |
Object bla. |
|
436 |
" |
|
437 |
||
438 |
"back with: |
|
439 |
NoHandlerError emergencyHandler:nil |
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440 |
" |
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441 |
||
442 |
"Modified: / 16.11.2001 / 16:07:05 / cg" |
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443 |
! |
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444 |
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445 |
notifyingEmergencyHandlerForUserProcesses |
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446 |
"return a block (usable as an emergency handler for exceptions), |
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447 |
which does errorNotification before going into the debugger, |
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448 |
but only for exceptions occurring in user processes; |
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449 |
systemProcesses are not debugged. |
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450 |
Halts and breakpoints go directly into the debugger (without asking)" |
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451 |
||
452 |
^ [:ex | |
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453 |
||
454 |
|theException| |
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455 |
||
456 |
Processor activeProcessIsSystemProcess ifTrue:[ |
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457 |
'EmergencyHandler [info]: exception cought: ' errorPrint. |
|
458 |
ex signal == NoHandlerError ifTrue:[ |
|
459 |
theException := ex unhandledException. |
|
460 |
] ifFalse:[ |
|
461 |
theException := ex |
|
462 |
]. |
|
463 |
theException description errorPrintCR. |
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464 |
AbortOperationRequest raise. |
|
465 |
] ifFalse:[ |
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466 |
(ex signal == NoHandlerError |
|
467 |
and:[ex unhandledException signal inheritsFrom:ControlInterrupt]) ifTrue:[ |
|
468 |
"/ go directly into the debugger ... |
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469 |
^ Debugger |
|
470 |
enter:ex suspendedContext |
|
471 |
withMessage:ex description |
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472 |
mayProceed:true |
|
473 |
] ifFalse:[ |
|
474 |
"/ ask, and maybe go into the debugger ... |
|
475 |
^ nil |
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476 |
errorNotify:ex description |
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477 |
from:ex suspendedContext |
|
478 |
allowDebug:true |
|
479 |
] |
|
480 |
] |
|
481 |
] |
|
482 |
||
483 |
"test with: |
|
484 |
NoHandlerError emergencyHandler:(NoHandlerError notifyingEmergencyHandlerForUserProcesses) |
|
485 |
Object bla. |
|
486 |
" |
|
487 |
||
488 |
"back with: |
|
489 |
NoHandlerError emergencyHandler:nil |
|
490 |
" |
|
491 |
||
492 |
"Modified: / 16.11.2001 / 16:06:54 / cg" |
|
493 |
! ! |
|
494 |
||
495 |
!NoHandlerError methodsFor:'accessing'! |
|
496 |
||
497 |
unhandledException |
|
498 |
^ parameter |
|
4528 | 499 |
! ! |
500 |
||
501 |
!NoHandlerError methodsFor:'default actions'! |
|
502 |
||
503 |
defaultAction |
|
504 |
"This action is performed, if nobody handles the NoHandlerError. |
|
505 |
Look for either a per-process emergencyHandlerBlock |
|
506 |
or the global emergencyHandler (from Exception) ..." |
|
507 |
||
508 |
|block| |
|
509 |
||
510 |
Processor notNil ifTrue:[ |
|
511 |
"care for signal during startup (Processor not yet created)" |
|
512 |
block := Processor activeProcess emergencySignalHandler. |
|
513 |
]. |
|
514 |
block isNil ifTrue:[ |
|
515 |
block := self class emergencyHandler. |
|
516 |
block isNil ifTrue:[ |
|
517 |
"care for error during startup (Exception not yet initialized)" |
|
4539
7064506e8285
debugger entry protocol changed;
Claus Gittinger <cg@exept.de>
parents:
4528
diff
changeset
|
518 |
^ MiniDebugger |
5295 | 519 |
enterWithMessage:self description |
4539
7064506e8285
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parents:
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diff
changeset
|
520 |
mayProceed:self mayProceed |
4528 | 521 |
]. |
522 |
]. |
|
523 |
||
4586
22c84f7f9b85
return nil from raise if proceeded in the debugger
Claus Gittinger <cg@exept.de>
parents:
4561
diff
changeset
|
524 |
^ block value:self |
4528 | 525 |
|
4561 | 526 |
! |
527 |
||
528 |
noHandler |
|
529 |
"redefined to avoid recursive invocations" |
|
530 |
||
531 |
^ self |
|
4528 | 532 |
! ! |
533 |
||
4539
7064506e8285
debugger entry protocol changed;
Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
534 |
!NoHandlerError methodsFor:'queries'! |
7064506e8285
debugger entry protocol changed;
Claus Gittinger <cg@exept.de>
parents:
4528
diff
changeset
|
535 |
|
7064506e8285
debugger entry protocol changed;
Claus Gittinger <cg@exept.de>
parents:
4528
diff
changeset
|
536 |
mayProceed |
7064506e8285
debugger entry protocol changed;
Claus Gittinger <cg@exept.de>
parents:
4528
diff
changeset
|
537 |
"return true, if the exception handler is allowed to proceed |
7064506e8285
debugger entry protocol changed;
Claus Gittinger <cg@exept.de>
parents:
4528
diff
changeset
|
538 |
the execution where the exception occured." |
7064506e8285
debugger entry protocol changed;
Claus Gittinger <cg@exept.de>
parents:
4528
diff
changeset
|
539 |
|
7064506e8285
debugger entry protocol changed;
Claus Gittinger <cg@exept.de>
parents:
4528
diff
changeset
|
540 |
parameter isNil ifTrue:[^ true]. |
7064506e8285
debugger entry protocol changed;
Claus Gittinger <cg@exept.de>
parents:
4528
diff
changeset
|
541 |
^ parameter mayProceed |
7064506e8285
debugger entry protocol changed;
Claus Gittinger <cg@exept.de>
parents:
4528
diff
changeset
|
542 |
|
7064506e8285
debugger entry protocol changed;
Claus Gittinger <cg@exept.de>
parents:
4528
diff
changeset
|
543 |
|
7064506e8285
debugger entry protocol changed;
Claus Gittinger <cg@exept.de>
parents:
4528
diff
changeset
|
544 |
! ! |
7064506e8285
debugger entry protocol changed;
Claus Gittinger <cg@exept.de>
parents:
4528
diff
changeset
|
545 |
|
4528 | 546 |
!NoHandlerError class methodsFor:'documentation'! |
547 |
||
548 |
version |
|
8678 | 549 |
^ '$Header: /cvs/stx/stx/libbasic/NoHandlerError.st,v 1.11 2005-01-13 12:36:36 stefan Exp $' |
4528 | 550 |
! ! |
7586 | 551 |
|
4528 | 552 |
NoHandlerError initialize! |