author | Claus Gittinger <cg@exept.de> |
Fri, 22 Oct 1999 20:25:14 +0200 | |
changeset 4932 | f47017a06866 |
parent 4674 | 7d0587e2d6a1 |
child 5422 | bf75e784e34f |
permissions | -rw-r--r-- |
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" |
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COPYRIGHT (c) 1988 by Claus Gittinger |
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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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Object variableSubclass:#Context |
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instanceVariableNames:'flags sender* home receiver selector searchClass lineNr |
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retvalTemp handle*' |
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classVariableNames:'InvalidReturnSignal SingleStepInterruptRequest' |
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poolDictionaries:'' |
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category:'Kernel-Methods' |
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! |
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!Context class methodsFor:'documentation'! |
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copyright |
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" |
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COPYRIGHT (c) 1988 by Claus Gittinger |
|
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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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||
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documentation |
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" |
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Contexts represent the stack frame objects, which keep the processing |
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state of a method or block (i.e. its local variables, temporaries etc.) |
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Every message send adds a context to a chain, which can be traced back via |
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the sender field. The context of the currently active method is always |
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accessable via the pseuodoVariable called 'thisContext'. |
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(The actual implementation uses the machines stack for this, building real |
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contexts on demand only). |
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For both method- and block-contexts, the layout is the same. |
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For method contexts, the home-field is nil, while for block contexts the home- |
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field is either the context of its surrounding block (i.e. the context of the |
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block, in which the receiving block was created, if its a nested block) or of |
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its home method. |
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Contexts of cheap blocks do not have a home context - their home field is |
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also nil. |
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Currently, contexts do not contain a reference to the method or block which |
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created it - this is not needed for program execution, but could get the debugger |
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somewhat into trouble: it has to search the class hierarchy for receiver/selector |
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combinations to find the method. This usually works, but fails in case of methods |
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which are not anchored in any class - especially leading to problems with wrapper- |
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and lazy methods. Also, Method>>valueWithReceiver - type of invocations cannot |
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be easily debugged. |
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Therefore, the implementation may be changed in the near future, to include a |
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field for the method/block, and set it in the VM during program execution. |
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(there may be some small performance penalty for this, though). |
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LineNumbers vs. program counter: |
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Due to the compilation to machine code, methods and/or block do not |
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always (actually: do seldom) contain bytecodes. Thus, there is no such concept |
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as a bytecode p-counter. To support debugging, the linenumber within the |
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original source is instead remembered when a send or loop entry is performed. |
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Since linenumbers are not always sufficient for debugging (multiple sends in one |
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line), this may be changed in future versions to a character offset, giving |
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the position of the selector in the source. |
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Restartable / Returnable contexts: |
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In previous versions (up to ST/X 2.10.5), every method stored enough |
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information in the context for that one to be restartable later (for example, |
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via the debuggers restart button). With 2.10.6, this is now an stc-compiler |
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option, and the system as delivered is compiled to only create restartable |
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contexts for those which contain blocks. This resulted in an overall speedup of |
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roughly 10-20% percent, depending on the type of CPU. However, it makes most |
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methods non-restartable (however, abort, signal handling and unwind blocks work |
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as usual). |
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In practice, this was reported to be not a severe limitation and all users were happy |
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to trade the increased performance for that slight inconvenience. |
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(during development, this is seldom a problem, since interpreted methods are always |
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returnable and restartable) |
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If you do not like this (and you are a happy owner of the full distribution), you |
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should recompile all classes with stc's '-optContext' flag. |
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Resuming contexts: |
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Strictly speaking, ST/X does not support a context to be resumed. However, |
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it does support a forced return (i.e. non-local-return) from a context. |
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Thus, resume of a context is implemented by forcing a return from the context |
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which was created by the method called from the first one. The effect is the same. |
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Returning from a dead method: |
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Blocksreturn from an outlived context (i.e. its home method has already returned) |
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is now rewarded by an invalidReturn exception - it used to be a noop in previous |
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releases (The blue book described this to be a noop, but other smalltalk implementations |
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changed this to be an invalid operation - good decision) |
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[instance variables:] |
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flags <SmallInteger> used by the VM; never touch. |
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contains info about number of args, |
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locals and temporaries. |
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sender <Context> the 'calling / sending' context |
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This is not directly accessable, since it may |
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be a lazy context (i.e. an empty frame). |
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The #sender method cares for this. |
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home <Context> the context, where this block was |
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created, or nil if its a method context |
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There are also cheap blocks, which do |
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not need a reference to the home context, |
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for those, its nil too. |
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receiver <Object> the receiver of this message |
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selector <Symbol> the selector of this message |
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searchClass <Class> the class, where the message lookup started |
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(for super sends) or nil, for regular sends. |
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lineNr <SmallInteger> the position where the context left off |
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(kind of p-counter). Only the low 16bits |
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are valid. |
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retValTemp nil temporary - always nil, when you see the context |
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(used in the VM as temporary) |
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handle *noObject* used by the VM; not accessable, not an object |
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<indexed> arguments of the send followed by |
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locals of the method/block followed by |
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temporaries. |
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[class variables:] |
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InvalidReturnSignal signal raised when a block tries |
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to return ('^') from a method context |
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which itself has already returned |
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(i.e. there is no place to return to) |
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WARNING: layout and size known by the compiler and runtime system - do not change. |
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[author:] |
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Claus Gittinger |
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[see also:] |
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Block Process Method |
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( contexts, stacks & unwinding : programming/contexts.html) |
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" |
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! ! |
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!Context class methodsFor:'initialization'! |
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initialize |
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InvalidReturnSignal isNil ifTrue:[ |
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InvalidReturnSignal := ErrorSignal newSignalMayProceed:true. |
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InvalidReturnSignal nameClass:self message:#invalidReturnSignal. |
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InvalidReturnSignal notifierString:'invalid return; method cannot return twice'. |
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SingleStepInterruptRequest := QuerySignal new. |
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SingleStepInterruptRequest nameClass:self message:#singleStepInterruptRequest. |
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SingleStepInterruptRequest notifierString:'single step'. |
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] |
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"Modified: 6.5.1996 / 16:46:03 / cg" |
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! ! |
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!Context class methodsFor:'Signal constants'! |
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invalidReturnSignal |
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"return the signal used when a method is tried to be returned twice |
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or, when some dead context is unwound or restarted." |
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^ InvalidReturnSignal |
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! |
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singleStepInterruptRequest |
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"return the dummy query signal to ask for single stepping" |
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^ SingleStepInterruptRequest |
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"Created: 6.5.1996 / 16:46:32 / cg" |
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! ! |
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!Context class methodsFor:'queries'! |
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isBuiltInClass |
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"return true if this class is known by the run-time-system. |
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Here, true is returned." |
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^ true |
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"Modified: 23.4.1996 / 15:58:00 / cg" |
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! ! |
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!Context class methodsFor:'special searching'! |
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findFirstSpecialHandle:searchForHandle raise:searchForRaise |
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|c| |
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%{ |
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OBJ __c__; |
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__c__ = __ContextInstPtr(__thisContext)->c_sender; |
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if (__isLazy(__c__)) { |
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__PATCHUPCONTEXT(__c__); |
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} |
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c = __c__; |
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%}. |
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^ c findSpecialHandle:searchForHandle raise:searchForRaise |
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||
223 |
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! ! |
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!Context methodsFor:'accessing'! |
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argAt:n |
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"return the n'th argument" |
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||
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n > self numArgs ifTrue:[ |
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^ self error:'invalid arg access' |
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]. |
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^ self at:n |
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"Modified: 12.10.1996 / 21:44:28 / cg" |
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! |
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||
239 |
argAt:n put:value |
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"set the n'th argument - useful when the receiver should be restarted" |
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n > self numArgs ifTrue:[ |
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^ self error:'invalid arg access' |
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]. |
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self at:n put:value. |
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"/ need some aid for optimized code - |
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"/ some machines have the arguments kept in register vars ... |
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"/ the unfix updates the machine-stack version of the receiver. |
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%{ |
4570 | 251 |
__UNFIXCONTEXT(self, 0); |
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%}. |
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^ value |
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255 |
"Modified: 12.10.1996 / 21:44:32 / cg" |
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! |
257 |
||
258 |
args |
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259 |
"return an array filled with the arguments of this context" |
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260 |
||
261 |
|n| |
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262 |
||
263 |
n := self numArgs. |
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3130 | 264 |
n == 0 ifTrue:[ |
265 |
"/ little optimization here - avaoid creating empty containers |
|
266 |
^ #() |
|
267 |
]. |
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623 | 268 |
^ (Array new:n) replaceFrom:1 to:n with:self. |
269 |
! |
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154 | 270 |
|
623 | 271 |
argsAndVars |
272 |
"return an array filled with the arguments and variables of this context" |
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273 |
||
274 |
|n| |
|
275 |
||
1810 | 276 |
n := self numArgs + self numVars. |
3130 | 277 |
n == 0 ifTrue:[ |
3143 | 278 |
"/ little optimization here - avoid creating empty containers |
3130 | 279 |
^ #() |
280 |
]. |
|
623 | 281 |
^ (Array new:n) replaceFrom:1 to:n with:self. |
1810 | 282 |
|
283 |
"Modified: 23.10.1996 / 16:19:41 / cg" |
|
623 | 284 |
! |
154 | 285 |
|
623 | 286 |
home |
287 |
"return the immediate home of the receiver. |
|
288 |
for block contexts, this is the methodcontext, where the block was created, |
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289 |
for nested block contexts, its the surrounding blocks context. |
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290 |
for method-contexts this is nil." |
|
25 | 291 |
|
623 | 292 |
^ nil "home" |
293 |
! |
|
1 | 294 |
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homeReceiver |
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296 |
"return the receiver from the context, where the receiver was defined" |
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|
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Add #homeReceiver (as in ST80).
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298 |
^ receiver |
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Add #homeReceiver (as in ST80).
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299 |
|
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300 |
"Created: / 5.3.1998 / 16:18:26 / stefan" |
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301 |
! |
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302 |
|
1 | 303 |
instVarAt:index |
69 | 304 |
"have to catch instVar access to retVal and handle - they are invalid. |
305 |
Notice, that one of the next ST/X versions will get some syntactic |
|
306 |
extension to get this automatically)." |
|
1 | 307 |
|
3508 | 308 |
(index == 2) ifTrue:[^ self sender]."/ sender - must be accessed specially |
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309 |
(index == 8) ifTrue:[^ nil]. "/ retvalTemp - invisible |
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310 |
(index == 9) ifTrue:[^ nil]. "/ handle to machine stack - invisible |
1 | 311 |
^ super instVarAt:index |
312 |
! |
|
313 |
||
314 |
instVarAt:index put:value |
|
69 | 315 |
"have to catch instVar access to retVal and handle - they are invalid. |
316 |
Notice, that one of the next ST/X versions will get some syntactic |
|
317 |
extension to get this automatically)." |
|
1 | 318 |
|
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319 |
(index == 2) ifTrue:[^ nil]. "/ sender - not allowed to change |
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320 |
(index == 8) ifTrue:[^ nil]. "/ retvalTemp - not allowed to change |
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(index == 9) ifTrue:[^ nil]. "/ handle to machine stack - not allowed to change |
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322 |
super instVarAt:index put:value. |
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323 |
|
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"/ need some aid for optimized code - |
ef99343d6756
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parents:
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diff
changeset
|
325 |
"/ some machines have the arguments kept in register vars ... |
ef99343d6756
better #unwind - ask receiver for handler block
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parents:
4464
diff
changeset
|
326 |
"/ the unfix updates the machine-stack version of the receiver. |
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|
327 |
%{ |
4570 | 328 |
__UNFIXCONTEXT(self, 0); |
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329 |
%}. |
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330 |
^ value |
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331 |
|
1 | 332 |
! |
333 |
||
4328
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334 |
javaLineNumber |
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335 |
|nr pc| |
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336 |
|
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care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
337 |
lineNr notNil ifTrue:[ |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
338 |
pc := lineNr bitAnd:16rFFFF. |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
339 |
]. |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
340 |
|
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
341 |
"/ 'ask line for pc:' print. pc printCR. |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
342 |
pc isNil ifTrue:[ |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
343 |
nr := self lineNumberFromMethod. |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
344 |
nr notNil ifTrue:[ |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
345 |
^ nr |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
346 |
]. |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
347 |
" '-> 0 [a]' printCR. " |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
348 |
^0 |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
349 |
]. |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
350 |
|
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
351 |
nr := self method lineNumberForPC:pc. |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
352 |
nr isNil ifTrue:[ |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
353 |
nr := self lineNumberFromMethod. |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
354 |
nr notNil ifTrue:[ |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
355 |
^ nr |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
356 |
]. |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
357 |
" '-> 0 [b]' printCR. " |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
358 |
^ 0 |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
359 |
]. |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
360 |
"/ '-> ' print. nr printCR. |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
361 |
^ nr. |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
362 |
|
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
363 |
! |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
364 |
|
623 | 365 |
lineNumber |
366 |
"this returns the lineNumber within the methods source, where the context was |
|
367 |
interrupted or called another method. (currently, sometimes this information |
|
368 |
is not available - in this case 0 is returned)" |
|
1 | 369 |
|
4464
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
370 |
|l| |
3923 | 371 |
|
4328
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
372 |
receiver isJavaObject ifTrue:[ |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
373 |
"/ chances are good that I am a javContext ... |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
374 |
self method isJavaMethod ifTrue:[ |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
375 |
^ self javaLineNumber |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
376 |
] |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
377 |
]. |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
378 |
|
3923 | 379 |
lineNr notNil ifTrue:[ |
380 |
l := lineNr bitAnd:16rFFFF. |
|
381 |
]. |
|
382 |
||
4464
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
383 |
"/ self isJavaContext ifTrue:[ |nr m| |
3923 | 384 |
"/ m := self method. |
385 |
"/ l isNil ifTrue:[ |
|
386 |
"/ m notNil ifTrue:[ |
|
387 |
"/ nr := m lineNumber |
|
388 |
"/ ]. |
|
389 |
"/ nr notNil ifTrue:[ |
|
390 |
"/ ^ nr |
|
391 |
"/ ]. |
|
392 |
"/ ^0 |
|
393 |
"/ ]. |
|
394 |
"/ nr := self method lineNumberForPC:l. |
|
395 |
"/ nr isNil ifTrue:[ |
|
396 |
"/ m notNil ifTrue:[ |
|
397 |
"/ nr := m lineNumber |
|
398 |
"/ ]. |
|
399 |
"/ nr notNil ifTrue:[ |
|
400 |
"/ ^ nr |
|
401 |
"/ ]. |
|
402 |
"/ ^ 0 |
|
403 |
"/ ]. |
|
404 |
"/ ^ nr. |
|
405 |
"/ ]. |
|
406 |
||
407 |
^ l |
|
408 |
||
409 |
"Modified: / 10.11.1998 / 13:19:48 / cg" |
|
1 | 410 |
! |
411 |
||
4450 | 412 |
lineNumberFromMethod |
413 |
^ 1 |
|
414 |
! |
|
415 |
||
1 | 416 |
method |
54 | 417 |
"return the method for which the receiver was created. |
418 |
To save time during normal execution, this information is not held in the |
|
419 |
context, but computed here on request." |
|
1 | 420 |
|
3508 | 421 |
|c sender sendersSelector m| |
1 | 422 |
|
325 | 423 |
c := self searchClass. |
424 |
" |
|
425 |
the below cannot happen in normal circumstances |
|
426 |
(added to avoid recursive errors in case of a broken sender chain) |
|
427 |
" |
|
428 |
c isBehavior ifFalse:[ |
|
3143 | 429 |
'Context [error]: non class in searchClass' errorPrintCR. |
430 |
' selector: ' errorPrint. selector errorPrint. |
|
431 |
' receiver: ' errorPrint. receiver errorPrintCR. |
|
432 |
^ nil |
|
325 | 433 |
]. |
434 |
||
328 | 435 |
c := c whichClassIncludesSelector:selector. |
1 | 436 |
c notNil ifTrue:[ |
3143 | 437 |
^ c compiledMethodAt:selector |
1 | 438 |
]. |
216 | 439 |
|
3508 | 440 |
"mhmh - seems to be a context for an unbound method (as generated by doIt); |
216 | 441 |
look in the senders context. Consider this a kludge. |
3143 | 442 |
(maybe it was not too good of an idea to NOT keep the current |
443 |
method in the context ...) |
|
444 |
Future versions of ST/X's message lookup may store the method in |
|
445 |
the context. |
|
216 | 446 |
" |
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
447 |
sender := self sender. |
3143 | 448 |
sender notNil ifTrue:[ |
449 |
sendersSelector := sender selector. |
|
450 |
sendersSelector notNil ifTrue:[ |
|
451 |
(sendersSelector startsWith:'valueWithReceiver:') ifTrue:[ |
|
3508 | 452 |
m := sender receiver. |
453 |
m isMethod ifTrue:[ |
|
454 |
^ m |
|
455 |
] |
|
3143 | 456 |
] |
457 |
] |
|
216 | 458 |
]. |
459 |
||
1 | 460 |
^ nil |
2135
6bd144c1c358
newStyle info & error messages
Claus Gittinger <cg@exept.de>
parents:
1853
diff
changeset
|
461 |
|
3143 | 462 |
"Modified: / 4.1.1998 / 21:15:32 / cg" |
1 | 463 |
! |
464 |
||
212 | 465 |
methodClass |
466 |
"return the class in which the method for which the receiver was created is." |
|
467 |
||
1456 | 468 |
|cls m| |
469 |
||
470 |
cls := self searchClass. |
|
3923 | 471 |
(cls isMeta |
472 |
and:[cls soleInstance isJavaClass]) ifTrue:[ |
|
473 |
cls := cls soleInstance |
|
474 |
]. |
|
1456 | 475 |
|
3923 | 476 |
[cls notNil] whileTrue:[ |
477 |
cls := cls whichClassIncludesSelector:selector. |
|
478 |
cls isNil ifTrue:[^ nil]. |
|
479 |
||
480 |
m := cls compiledMethodAt:selector. |
|
481 |
m notNil ifTrue:[ |
|
482 |
m isIgnored ifFalse:[^ cls]. |
|
483 |
]. |
|
484 |
cls := cls superclass |
|
1456 | 485 |
]. |
486 |
^ cls |
|
487 |
||
3923 | 488 |
"Modified: / 5.11.1998 / 19:07:43 / cg" |
212 | 489 |
! |
490 |
||
623 | 491 |
methodHome |
492 |
"return the method-home - for method contexts this is the receiver" |
|
493 |
||
494 |
^ self |
|
495 |
! |
|
496 |
||
497 |
ntemp |
|
498 |
"return the number of temporary variables of the Block/Method. |
|
1810 | 499 |
(for debugging only). |
500 |
I dont like the name of this method; its here for compatibility." |
|
623 | 501 |
|
1810 | 502 |
^ self numTemps |
503 |
||
504 |
"Modified: 23.10.1996 / 16:19:06 / cg" |
|
623 | 505 |
! |
506 |
||
507 |
numArgs |
|
508 |
"return the number of arguments to the Block/Method" |
|
509 |
||
510 |
%{ /* NOCONTEXT */ |
|
511 |
||
1133 | 512 |
RETURN ( __MKSMALLINT( (__intVal(__INST(flags)) >> __NARG_SHIFT) & __NARG_MASK) ); |
623 | 513 |
%} |
514 |
! |
|
515 |
||
1810 | 516 |
numTemps |
517 |
"return the number of temporary variables of the Block/Method. |
|
518 |
(for debugging only)" |
|
519 |
||
520 |
^ self size - self numArgs - self numVars |
|
521 |
||
522 |
"Created: 23.10.1996 / 16:19:10 / cg" |
|
523 |
"Modified: 23.10.1996 / 16:19:48 / cg" |
|
524 |
! |
|
525 |
||
526 |
numVars |
|
623 | 527 |
"return the number of local variables of the Block/Method" |
536
dcffd1753902
be safe, when accessing a contexts sender.
Claus Gittinger <cg@exept.de>
parents:
528
diff
changeset
|
528 |
|
623 | 529 |
%{ /* NOCONTEXT */ |
530 |
||
1133 | 531 |
RETURN ( __MKSMALLINT( (__intVal(__INST(flags)) >> __NVAR_SHIFT) & __NVAR_MASK) ); |
623 | 532 |
%} |
533 |
! |
|
534 |
||
1810 | 535 |
nvars |
536 |
"return the number of local variables of the Block/Method. |
|
537 |
I dont like the name of this method; its here for compatibility." |
|
538 |
||
539 |
^ self numVars |
|
540 |
||
541 |
"Modified: 23.10.1996 / 16:18:44 / cg" |
|
542 |
! |
|
543 |
||
623 | 544 |
receiver |
545 |
"return the receiver of the context" |
|
546 |
||
547 |
^ receiver |
|
548 |
! |
|
549 |
||
4543 | 550 |
receiver:aCompiledCode |
551 |
"set the receiver of the message" |
|
552 |
||
4560
618151751813
Need _UNFIXCONTEXT() when changing receiver.
Stefan Vogel <sv@exept.de>
parents:
4557
diff
changeset
|
553 |
receiver := aCompiledCode. |
4543 | 554 |
|
4560
618151751813
Need _UNFIXCONTEXT() when changing receiver.
Stefan Vogel <sv@exept.de>
parents:
4557
diff
changeset
|
555 |
"/ need some aid for optimized code - |
618151751813
Need _UNFIXCONTEXT() when changing receiver.
Stefan Vogel <sv@exept.de>
parents:
4557
diff
changeset
|
556 |
"/ some machines have the arguments kept in register vars ... |
618151751813
Need _UNFIXCONTEXT() when changing receiver.
Stefan Vogel <sv@exept.de>
parents:
4557
diff
changeset
|
557 |
"/ the unfix updates the machine-stack version of the receiver. |
618151751813
Need _UNFIXCONTEXT() when changing receiver.
Stefan Vogel <sv@exept.de>
parents:
4557
diff
changeset
|
558 |
%{ |
4570 | 559 |
__UNFIXCONTEXT(self, 0); |
4560
618151751813
Need _UNFIXCONTEXT() when changing receiver.
Stefan Vogel <sv@exept.de>
parents:
4557
diff
changeset
|
560 |
%}. |
4543 | 561 |
|
562 |
! |
|
563 |
||
623 | 564 |
searchClass |
565 |
"this is the class where the method-lookup started; |
|
566 |
for normal sends, it is nil (or sometimes the receivers class). |
|
567 |
For supersends, its the superclass of the one, in which the |
|
568 |
caller was defined." |
|
569 |
||
570 |
searchClass notNil ifTrue:[^ searchClass]. |
|
571 |
^ receiver class |
|
572 |
! |
|
573 |
||
574 |
selector |
|
575 |
"return the selector of the method for which the context was created" |
|
576 |
||
577 |
^ selector |
|
536
dcffd1753902
be safe, when accessing a contexts sender.
Claus Gittinger <cg@exept.de>
parents:
528
diff
changeset
|
578 |
! |
dcffd1753902
be safe, when accessing a contexts sender.
Claus Gittinger <cg@exept.de>
parents:
528
diff
changeset
|
579 |
|
1 | 580 |
sender |
581 |
"return the sender of the context" |
|
582 |
||
536
dcffd1753902
be safe, when accessing a contexts sender.
Claus Gittinger <cg@exept.de>
parents:
528
diff
changeset
|
583 |
%{ /* NOCONTEXT */ |
1668
41db5950f9ea
oops - con local variables are now renamed (last change in stc)
Claus Gittinger <cg@exept.de>
parents:
1492
diff
changeset
|
584 |
OBJ theContext; |
536
dcffd1753902
be safe, when accessing a contexts sender.
Claus Gittinger <cg@exept.de>
parents:
528
diff
changeset
|
585 |
|
3508 | 586 |
theContext = __INST(sender_); |
949 | 587 |
/* |
588 |
* this special nil test is for the very first context (startup-context); |
|
589 |
* actually, its cosmetics, to avoid a visible nil>>nil context in the debugger. |
|
590 |
*/ |
|
2205 | 591 |
if (__isNonNilObject(theContext)) { |
949 | 592 |
|
1668
41db5950f9ea
oops - con local variables are now renamed (last change in stc)
Claus Gittinger <cg@exept.de>
parents:
1492
diff
changeset
|
593 |
if (__isLazy(theContext)) { |
536
dcffd1753902
be safe, when accessing a contexts sender.
Claus Gittinger <cg@exept.de>
parents:
528
diff
changeset
|
594 |
/* |
dcffd1753902
be safe, when accessing a contexts sender.
Claus Gittinger <cg@exept.de>
parents:
528
diff
changeset
|
595 |
* this cannot happen |
dcffd1753902
be safe, when accessing a contexts sender.
Claus Gittinger <cg@exept.de>
parents:
528
diff
changeset
|
596 |
*/ |
2212 | 597 |
__PATCHUPCONTEXT(theContext); |
536
dcffd1753902
be safe, when accessing a contexts sender.
Claus Gittinger <cg@exept.de>
parents:
528
diff
changeset
|
598 |
} |
3508 | 599 |
if (! __isNonLIFO(theContext)) { |
600 |
/* |
|
601 |
* to be prepared for the worst situation |
|
602 |
* (the sender is not stored, so the trap wont catch it) |
|
603 |
* make the writeBarrier trigger manually. |
|
604 |
* We'll see, if this is really required. |
|
605 |
*/ |
|
606 |
theContext->o_space |= CATCHMARK; |
|
607 |
_markNonLIFO(theContext); |
|
608 |
} |
|
536
dcffd1753902
be safe, when accessing a contexts sender.
Claus Gittinger <cg@exept.de>
parents:
528
diff
changeset
|
609 |
} |
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
610 |
RETURN (theContext); |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
611 |
%} |
1 | 612 |
! |
613 |
||
2510
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
614 |
senderIsNil |
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
615 |
"return true, if I have no sender" |
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
616 |
|
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
617 |
%{ /* NOCONTEXT */ |
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
618 |
if ( __INST(sender_) == nil ) { |
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
619 |
RETURN (true); |
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
620 |
} |
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
621 |
RETURN (false); |
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
622 |
%} |
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
623 |
! |
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
624 |
|
623 | 625 |
setLineNumber:aNumber |
626 |
"private entry for uncompiledCodeObject ..." |
|
1 | 627 |
|
623 | 628 |
lineNr := aNumber |
340 | 629 |
! |
630 |
||
202 | 631 |
temporaries |
632 |
"return an array filled with the temporaries of this context" |
|
633 |
||
308 | 634 |
|nonTemps mySize| |
202 | 635 |
|
1810 | 636 |
nonTemps := self numArgs + self numVars. |
637 |
mySize := self numTemps. |
|
3130 | 638 |
mySize == 0 ifTrue:[ |
639 |
"/ little optimization here - avaoid creating empty containers |
|
640 |
^ #() |
|
641 |
]. |
|
308 | 642 |
^ (Array new:mySize) replaceFrom:1 to:mySize with:self startingAt:nonTemps+1 |
1810 | 643 |
|
644 |
"Modified: 23.10.1996 / 16:20:00 / cg" |
|
202 | 645 |
! |
646 |
||
10 | 647 |
varAt:n |
648 |
"return the n'th local variable" |
|
649 |
||
154 | 650 |
^ self at:(n + self numArgs) |
10 | 651 |
! |
652 |
||
653 |
varAt:n put:value |
|
654 |
"set the n'th local variable - useful when the receiver should be restarted |
|
54 | 655 |
or continued" |
10 | 656 |
|
154 | 657 |
self at:(n + self numArgs) put:value |
10 | 658 |
! |
659 |
||
623 | 660 |
vars |
661 |
"return an array filled with the local variables of this context" |
|
375 | 662 |
|
623 | 663 |
|nonVars mySize| |
360 | 664 |
|
623 | 665 |
nonVars := self numArgs. |
1810 | 666 |
mySize := self numVars. |
3130 | 667 |
mySize == 0 ifTrue:[ |
668 |
"/ little optimization here - avaoid creating empty containers |
|
669 |
^ #() |
|
670 |
]. |
|
623 | 671 |
^ (Array new:mySize) replaceFrom:1 to:mySize with:self startingAt:nonVars+1 |
1810 | 672 |
|
673 |
"Modified: 23.10.1996 / 16:20:06 / cg" |
|
1 | 674 |
! ! |
675 |
||
623 | 676 |
!Context methodsFor:'copying'! |
415 | 677 |
|
3350
40dc4807a6d4
must catch #deppCopyUsing: instead of #deepCopy.
Claus Gittinger <cg@exept.de>
parents:
3324
diff
changeset
|
678 |
deepCopyUsing:aDictionary |
623 | 679 |
"raise an error - deepCopy is not allowed for contexts" |
37 | 680 |
|
623 | 681 |
^ self deepCopyError |
3350
40dc4807a6d4
must catch #deppCopyUsing: instead of #deepCopy.
Claus Gittinger <cg@exept.de>
parents:
3324
diff
changeset
|
682 |
|
40dc4807a6d4
must catch #deppCopyUsing: instead of #deepCopy.
Claus Gittinger <cg@exept.de>
parents:
3324
diff
changeset
|
683 |
"Created: / 31.3.1998 / 15:51:14 / cg" |
1 | 684 |
! ! |
685 |
||
77 | 686 |
!Context methodsFor:'error handling'! |
687 |
||
688 |
invalidReturn:returnValue |
|
689 |
"this message is sent by the VM, when a methods context |
|
690 |
which has already returned is about to return again. |
|
691 |
(i.e. about to execute a return from an already returned |
|
105 | 692 |
method in a block). |
141 | 693 |
We raise a signal here, to allow catching of that situation." |
77 | 694 |
|
406 | 695 |
" |
696 |
in previous versions of ST/X and ST-80, this was no error; |
|
697 |
(instead, a normal blockreturn was performed to the value-sender). |
|
698 |
From a note in comp.lang.smalltalk, I conclude that new ST-80 versions |
|
699 |
now raise an error if this happens. |
|
700 |
Comment out the raise below to get that (old) behavior |
|
701 |
BETTER REWRITE YOUR APPLICATION |
|
702 |
" |
|
3258
2d96bba62ff1
use another error message if attempting to
Claus Gittinger <cg@exept.de>
parents:
3182
diff
changeset
|
703 |
"/ old behavior: |
2d96bba62ff1
use another error message if attempting to
Claus Gittinger <cg@exept.de>
parents:
3182
diff
changeset
|
704 |
"/ ^ returnValue |
2d96bba62ff1
use another error message if attempting to
Claus Gittinger <cg@exept.de>
parents:
3182
diff
changeset
|
705 |
|
282 | 706 |
"/ new behavior: |
707 |
||
3258
2d96bba62ff1
use another error message if attempting to
Claus Gittinger <cg@exept.de>
parents:
3182
diff
changeset
|
708 |
"/ if this context is one of another process, |
2d96bba62ff1
use another error message if attempting to
Claus Gittinger <cg@exept.de>
parents:
3182
diff
changeset
|
709 |
"/ use another error message. |
2d96bba62ff1
use another error message if attempting to
Claus Gittinger <cg@exept.de>
parents:
3182
diff
changeset
|
710 |
|
2d96bba62ff1
use another error message if attempting to
Claus Gittinger <cg@exept.de>
parents:
3182
diff
changeset
|
711 |
(home notNil and:[home sender notNil]) ifTrue:[ |
2d96bba62ff1
use another error message if attempting to
Claus Gittinger <cg@exept.de>
parents:
3182
diff
changeset
|
712 |
^ InvalidReturnSignal |
2d96bba62ff1
use another error message if attempting to
Claus Gittinger <cg@exept.de>
parents:
3182
diff
changeset
|
713 |
raiseRequestWith:returnValue |
2d96bba62ff1
use another error message if attempting to
Claus Gittinger <cg@exept.de>
parents:
3182
diff
changeset
|
714 |
errorString:'cannot return from another process''s context'. |
2d96bba62ff1
use another error message if attempting to
Claus Gittinger <cg@exept.de>
parents:
3182
diff
changeset
|
715 |
]. |
2d96bba62ff1
use another error message if attempting to
Claus Gittinger <cg@exept.de>
parents:
3182
diff
changeset
|
716 |
|
406 | 717 |
^ InvalidReturnSignal |
3258
2d96bba62ff1
use another error message if attempting to
Claus Gittinger <cg@exept.de>
parents:
3182
diff
changeset
|
718 |
raiseRequestWith:returnValue. |
282 | 719 |
|
3258
2d96bba62ff1
use another error message if attempting to
Claus Gittinger <cg@exept.de>
parents:
3182
diff
changeset
|
720 |
"Modified: / 2.2.1998 / 15:19:52 / cg" |
406 | 721 |
! |
722 |
||
723 |
invalidReturnOrRestart:returnValue |
|
724 |
"this message is sent by the VM, when a methods context |
|
725 |
which was compiled non-returnable is about to return again. |
|
726 |
We raise a signal here, to allow catching of that situation." |
|
727 |
||
360 | 728 |
^ InvalidReturnSignal |
729 |
raiseRequestWith:returnValue |
|
730 |
errorString:'method was compiled non-resumable' |
|
731 |
! |
|
732 |
||
733 |
invalidReturnOrRestartError:how with:value |
|
734 |
"common error reporter for restart/return errors" |
|
735 |
||
736 |
self canReturn ifTrue:[ |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
737 |
" |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
738 |
tried to return from/restart a context which is already dead |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
739 |
(i.e. the method/block has already executed a return) |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
740 |
" |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
741 |
^ InvalidReturnSignal |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
742 |
raiseRequestWith:value |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
743 |
errorString:(how , ' context not on calling chain') |
360 | 744 |
]. |
745 |
" |
|
746 |
tried to return from/restart a context of a method which was compiled |
|
747 |
unrestartable or of a block (which is never restartable) |
|
748 |
" |
|
749 |
^ InvalidReturnSignal |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
750 |
raiseRequestWith:value |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
751 |
errorString:(how , ' context cannot be restarted/returned from') |
77 | 752 |
! ! |
753 |
||
623 | 754 |
!Context methodsFor:'minidebugger printing'! |
755 |
||
756 |
fullPrint |
|
757 |
"print the receiver, selector and args of the context |
|
758 |
- used only for MiniDebuggers walkback print" |
|
759 |
||
760 |
self receiverPrintString print. ' ' print. selector print. |
|
761 |
self size ~~ 0 ifTrue: [ |
|
3143 | 762 |
' ' print. self argsDisplayString print |
623 | 763 |
]. |
1426 | 764 |
' [' print. self lineNumber print. ']' printCR |
623 | 765 |
|
766 |
" |
|
767 |
thisContext fullPrint |
|
768 |
" |
|
1426 | 769 |
|
770 |
"Modified: 20.5.1996 / 10:27:14 / cg" |
|
623 | 771 |
! |
772 |
||
773 |
fullPrintAll |
|
774 |
"print a full walkback starting at the receiver |
|
775 |
- used only for MiniDebuggers walkback print" |
|
776 |
||
777 |
|context| |
|
778 |
||
779 |
context := self. |
|
780 |
[context notNil] whileTrue: [ |
|
781 |
context fullPrint. |
|
782 |
context := context sender |
|
783 |
] |
|
784 |
||
785 |
" |
|
786 |
thisContext fullPrintAll |
|
787 |
" |
|
2173 | 788 |
! |
789 |
||
4674 | 790 |
fullPrintAllLevels:nOrNil |
791 |
"print a full walkback starting at the receiver, only print n levels |
|
792 |
- used only for MiniDebuggers walkback print" |
|
793 |
||
794 |
|context count| |
|
795 |
||
796 |
count := 0. |
|
797 |
context := self. |
|
798 |
[context notNil] whileTrue: [ |
|
799 |
context fullPrint. |
|
800 |
context := context sender. |
|
801 |
nOrNil ifNotNil:[ |
|
802 |
(count := count+1) > nOrNil ifTrue:[^self]. |
|
803 |
] |
|
804 |
] |
|
805 |
||
806 |
" |
|
807 |
thisContext fullPrintAll |
|
808 |
" |
|
809 |
||
810 |
"Created: / 3.9.1999 / 14:02:38 / ps" |
|
811 |
! |
|
812 |
||
2173 | 813 |
fullPrintAllOn:aStream |
814 |
"print a full walkback starting at the receiver |
|
815 |
- used only for MiniDebuggers walkback print" |
|
816 |
||
817 |
|context| |
|
818 |
||
819 |
context := self. |
|
820 |
[context notNil] whileTrue: [ |
|
3143 | 821 |
context fullPrintOn:aStream. |
822 |
context := context sender |
|
2173 | 823 |
] |
824 |
||
825 |
" |
|
826 |
thisContext fullPrintAllOn:Transcript |
|
827 |
" |
|
828 |
||
829 |
"Created: 15.1.1997 / 18:09:05 / cg" |
|
830 |
! |
|
831 |
||
832 |
fullPrintOn:aStream |
|
833 |
"print the receiver, selector and args of the context |
|
834 |
- used only for MiniDebuggers walkback print" |
|
835 |
||
836 |
self receiverPrintString printOn:aStream. ' ' printOn:aStream. selector printOn:aStream. |
|
837 |
self size ~~ 0 ifTrue: [ |
|
3143 | 838 |
' ' printOn:aStream. self argsDisplayString printOn:aStream |
2173 | 839 |
]. |
840 |
' [' printOn:aStream. self lineNumber printOn:aStream. ']' printOn:aStream. |
|
841 |
aStream cr |
|
842 |
||
843 |
" |
|
844 |
thisContext fullPrintOn:Transcript |
|
845 |
" |
|
846 |
||
847 |
"Modified: 20.5.1996 / 10:27:14 / cg" |
|
848 |
"Created: 15.1.1997 / 18:09:06 / cg" |
|
623 | 849 |
! ! |
850 |
||
1 | 851 |
!Context methodsFor:'non local control flow'! |
852 |
||
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
853 |
evaluateUnwindActionsUpTo:aContext |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
854 |
"walk up the calling chain, looking for unwind-cleanup actions to |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
855 |
be performed. This depends upon those contexts being specially |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
856 |
marked using #markForUnwind. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
857 |
Returns the argument (i.e. non-nil), if all went well, |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
858 |
nil if aContext is not on the caller chain (definitely an error)" |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
859 |
|
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
860 |
|con unwindBlock| |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
861 |
|
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
862 |
" |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
863 |
start with this context, moving up, looking for unwind actions |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
864 |
" |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
865 |
con := self findNextUnwindContextOr:aContext. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
866 |
[con notNil and:[con ~~ aContext]] whileTrue:[ |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
867 |
unwindBlock := con receiver unwindHandlerInContext:con. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
868 |
con unmarkForUnwind. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
869 |
unwindBlock value. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
870 |
|
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
871 |
con := con findNextUnwindContextOr:aContext. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
872 |
]. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
873 |
^ con |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
874 |
! |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
875 |
|
1 | 876 |
restart |
877 |
"restart the receiver - i.e. the method is evaluated again. |
|
402 | 878 |
if the context to restart already died, trigger an error. |
141 | 879 |
This is a low level helper for unwindAndRestart. |
880 |
||
881 |
NOTICE: |
|
154 | 882 |
NO unwind actions are performed - this is usually not |
883 |
what you want (see Context>>unwindAndRestart). |
|
141 | 884 |
|
885 |
LIMITATION: |
|
154 | 886 |
currently a context can only be restarted by |
928 | 887 |
the owning process - not from outside. |
888 |
Also, the compiler has an option (+optcontext) to create |
|
889 |
non-restartable contexts (which are faster). |
|
890 |
If such a context is restarted, a runtime error is raised." |
|
1 | 891 |
|
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
892 |
%{ /* NOCONTEXT */ |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
893 |
if (__INST(sender_) != nil) { |
3143 | 894 |
__RESUMECONTEXT__(self, RESTART_VALUE, 0); |
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
895 |
} |
360 | 896 |
%}. |
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
897 |
self sender isNil ifTrue:[^ nil]. |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
898 |
|
69 | 899 |
" |
360 | 900 |
when we arrive here, something went wrong. |
69 | 901 |
debugging ... |
902 |
" |
|
360 | 903 |
^ self invalidReturnOrRestartError:#restart with:nil |
1 | 904 |
! |
905 |
||
623 | 906 |
resume |
907 |
"resume execution in this context. I.e. as if the method called |
|
908 |
last by the receiver did a ^ nil. |
|
909 |
If the context has already returned, report an error. |
|
910 |
||
911 |
NOTICE: |
|
912 |
NO unwind actions are performed (see Context>>unwind). |
|
913 |
||
914 |
LIMITATION: |
|
915 |
currently a context can only be resumed by |
|
928 | 916 |
the owning process - not from outside. |
917 |
Also, the compiler has an option (+optcontext) to create |
|
918 |
non-resumable contexts (which are faster). |
|
919 |
If such a context is restarted, a runtime error is raised." |
|
623 | 920 |
|
921 |
^ self resume:nil |
|
922 |
! |
|
923 |
||
924 |
resume:value |
|
925 |
"resume the receiver - as if it got 'value' from whatever |
|
926 |
it called. This continues execution in the receivers method |
|
927 |
after the point where it did its last send. |
|
928 |
If the context has already returned - report an error. |
|
929 |
||
930 |
NOTICE: |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
931 |
NO unwind actions are performed (see Context>>unwind:). |
623 | 932 |
|
933 |
LIMITATION: |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
934 |
currently a context can only be resumed by |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
935 |
the owning process - not from outside. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
936 |
Also, the compiler has an option (+optcontext) to create |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
937 |
non-resumable contexts (which are faster). |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
938 |
If such a context is restarted, a runtime error is raised." |
623 | 939 |
|
1668
41db5950f9ea
oops - con local variables are now renamed (last change in stc)
Claus Gittinger <cg@exept.de>
parents:
1492
diff
changeset
|
940 |
|theContext| |
623 | 941 |
|
942 |
" |
|
2510
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
943 |
starting with this context, find the one below |
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
944 |
(i.e. the one that I have called) and return from it. |
623 | 945 |
" |
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
946 |
|
2510
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
947 |
%{ |
4557 | 948 |
OBJ sndr; |
949 |
||
2510
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
950 |
theContext = __thisContext; |
4557 | 951 |
while (theContext != nil) { |
952 |
sndr = __ContextInstPtr(theContext)->c_sender; |
|
953 |
if (sndr == self) break; |
|
954 |
theContext = sndr; |
|
623 | 955 |
} |
3508 | 956 |
if (theContext != nil) { |
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
957 |
if (__isLazy(theContext)) { |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
958 |
__PATCHUPCONTEXT(theContext); |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
959 |
} |
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
960 |
} |
623 | 961 |
%}. |
962 |
||
1668
41db5950f9ea
oops - con local variables are now renamed (last change in stc)
Claus Gittinger <cg@exept.de>
parents:
1492
diff
changeset
|
963 |
theContext isNil ifTrue:[ |
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
964 |
" |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
965 |
tried to resume in context which is already dead |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
966 |
(i.e. the method/block has already executed a return) |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
967 |
" |
4557 | 968 |
^ thisContext invalidReturnOrRestartError:#'resume:' with:value |
623 | 969 |
]. |
1668
41db5950f9ea
oops - con local variables are now renamed (last change in stc)
Claus Gittinger <cg@exept.de>
parents:
1492
diff
changeset
|
970 |
^ theContext return:value |
623 | 971 |
! |
972 |
||
4557 | 973 |
resumeIgnoringErrors:value |
974 |
"resume the receiver - as if it got 'value' from whatever |
|
975 |
it called. This continues execution in the receivers method |
|
976 |
after the point where it did its last send. |
|
977 |
If the context has already returned - simply return. |
|
978 |
||
979 |
NOTICE: |
|
980 |
NO unwind actions are performed (see Context>>unwind:). |
|
981 |
||
982 |
LIMITATION: |
|
983 |
currently a context can only be resumed by |
|
984 |
the owning process - not from outside. |
|
985 |
Also, the compiler has an option (+optcontext) to create |
|
986 |
non-resumable contexts (which are faster). |
|
987 |
If such a context is restarted, a runtime error is raised." |
|
988 |
||
989 |
" |
|
990 |
starting with this context, find the one below |
|
991 |
(i.e. the one that I have called) and return from it. |
|
992 |
" |
|
993 |
||
994 |
%{ |
|
995 |
OBJ theContext, sndr; |
|
996 |
||
997 |
theContext = __thisContext; |
|
998 |
while (theContext != nil) { |
|
999 |
sndr = __ContextInstPtr(theContext)->c_sender; |
|
1000 |
if (sndr == self) break; |
|
1001 |
theContext = sndr; |
|
1002 |
} |
|
1003 |
if (theContext != nil) { |
|
1004 |
if (__ContextInstPtr(theContext)->c_sender) { |
|
4635 | 1005 |
if (!((INT)(__ContextInstPtr(theContext)->c_flags) & __MASKSMALLINT(__CANNOT_RETURN))) { |
1006 |
__RESUMECONTEXT__(theContext, value, 0); |
|
1007 |
} |
|
4557 | 1008 |
} |
1009 |
} |
|
1010 |
%}. |
|
1011 |
||
1012 |
"/ no error reporting |
|
1013 |
! |
|
1014 |
||
1015 |
resumeOnErrorProceed:value |
|
1016 |
"resume the receiver - as if it got 'value' from whatever |
|
1017 |
it called. This continues execution in the receivers method |
|
1018 |
after the point where it did its last send. |
|
1019 |
If the context has already returned - simply return. |
|
1020 |
||
1021 |
NOTICE: |
|
1022 |
NO unwind actions are performed (see Context>>unwind:). |
|
1023 |
||
1024 |
LIMITATION: |
|
1025 |
currently a context can only be resumed by |
|
1026 |
the owning process - not from outside. |
|
1027 |
Also, the compiler has an option (+optcontext) to create |
|
1028 |
non-resumable contexts (which are faster). |
|
1029 |
If such a context is restarted, a runtime error is raised." |
|
1030 |
||
1031 |
" |
|
1032 |
starting with this context, find the one below |
|
1033 |
(i.e. the one that I have called) and return from it. |
|
1034 |
" |
|
1035 |
||
1036 |
%{ |
|
1037 |
OBJ theContext, sndr; |
|
1038 |
||
1039 |
theContext = __thisContext; |
|
1040 |
while (theContext != nil) { |
|
1041 |
sndr = __ContextInstPtr(theContext)->c_sender; |
|
1042 |
if (sndr == self) break; |
|
1043 |
theContext = sndr; |
|
1044 |
} |
|
1045 |
if (theContext != nil) { |
|
1046 |
if (__ContextInstPtr(theContext)->c_sender) { |
|
1047 |
__RESUMECONTEXT__(theContext, value, 0); |
|
1048 |
} |
|
1049 |
} |
|
1050 |
%}. |
|
1051 |
||
1052 |
"/ no error reporting |
|
1053 |
! |
|
1054 |
||
69 | 1055 |
return |
141 | 1056 |
"return from this context with nil. I.e. as if it did a ^ nil. |
1057 |
NOTICE: |
|
154 | 1058 |
NO unwind actions are performed - this is usually not |
1059 |
what you want (See Context>>unwind). |
|
1060 |
This is a low level method - a helper for unwind. |
|
1 | 1061 |
|
141 | 1062 |
LIMITATION: |
154 | 1063 |
currently a context can only be returned by |
928 | 1064 |
the owning process - not from outside. |
1065 |
Also, the compiler has an option (+optcontext) to create |
|
1066 |
non-returnable contexts (which are faster). |
|
1067 |
If such a context is restarted, a runtime error is raised." |
|
141 | 1068 |
|
1069 |
^ self return:nil |
|
1 | 1070 |
! |
1071 |
||
69 | 1072 |
return:value |
1073 |
"return from this context as if it did a '^ value'. |
|
141 | 1074 |
NOTICE: |
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1075 |
NO unwind actions are performed - this is usually not |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1076 |
what you want (See Context>>unwind:). |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1077 |
This is a low level method - a helper for unwind. |
141 | 1078 |
|
1079 |
LIMITATION: |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1080 |
currently a context can only be returned by |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1081 |
the owning process - not from outside. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1082 |
Also, the compiler has an option (+optcontext) to create |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1083 |
non-returnable contexts (which are faster). |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1084 |
If such a context is restarted, a runtime error is raised." |
1 | 1085 |
|
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
1086 |
%{ /* NOCONTEXT */ |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
1087 |
if (__INST(sender_) != nil) { |
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1088 |
__RESUMECONTEXT__(self, value, 0); |
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
1089 |
} |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
1090 |
%}. |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
1091 |
self sender isNil ifTrue:[^ nil]. |
1 | 1092 |
|
69 | 1093 |
" |
360 | 1094 |
when we arrive here, something went wrong. |
69 | 1095 |
debugging ... |
1096 |
" |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1097 |
^ self invalidReturnOrRestartError:#'return' with:value |
1 | 1098 |
! |
1099 |
||
328 | 1100 |
returnDoing:aBlock |
1101 |
"return from this context as if it did a '^ aBlock value'. |
|
1102 |
The block is evaluated as if called by the receiver context; |
|
1103 |
NOT the true executing context. |
|
1104 |
NOTICE: |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1105 |
NO unwind actions are performed - this is usually not |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1106 |
what you want (See Context>>unwindThenDo:). |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1107 |
This is a low level method - a helper for unwind. |
328 | 1108 |
|
1109 |
LIMITATION: |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1110 |
currently a context can only be returned by |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1111 |
the owning process - not from outside. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1112 |
Also, the compiler has an option (+optcontext) to create |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1113 |
non-returnable contexts (which are faster). |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1114 |
If such a context is restarted, a runtime error is raised." |
328 | 1115 |
|
4557 | 1116 |
%{ |
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
1117 |
if (__INST(sender_) != nil) { |
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1118 |
__RESUMECONTEXT__(self, aBlock, 2); |
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
1119 |
} |
360 | 1120 |
%}. |
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
1121 |
self sender isNil ifTrue:[^ nil]. |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
1122 |
|
328 | 1123 |
" |
360 | 1124 |
when we arrive here, something went wrong. |
328 | 1125 |
debugging ... |
1126 |
" |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1127 |
^ self invalidReturnOrRestartError:#'returnDoing' with:aBlock |
328 | 1128 |
! |
1129 |
||
1 | 1130 |
unwind |
69 | 1131 |
"return nil from the receiver - i.e. simulate a '^ nil'. |
360 | 1132 |
If the context has already retruned, report an error. |
1 | 1133 |
Evaluate all unwind-blocks as specified in Block>>valueNowOrOnUnwind: |
69 | 1134 |
and Block>>valueOnUnwindDo: on the way. |
1 | 1135 |
|
141 | 1136 |
LIMITATION: |
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1137 |
currently a context can only be unwound by |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1138 |
the owning process - not from outside. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1139 |
i.e. it is not possible for one thread to unwind |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1140 |
another threads context - which does not make sense anyway. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1141 |
However, you can force another thread to do this in its own process |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1142 |
context, by giving it an interrupt action - this does make sense. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1143 |
|
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1144 |
Also, the compiler has an option (+optcontext) to create |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1145 |
non-returnable contexts (which are faster). |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1146 |
If such a context is restarted, a runtime error is raised." |
141 | 1147 |
|
1148 |
^ self unwind:nil |
|
1 | 1149 |
! |
1150 |
||
1151 |
unwind:value |
|
69 | 1152 |
"return value from the receiver - i.e. simulate a '^ value'. |
360 | 1153 |
If the context has already returned , report an error. |
1 | 1154 |
Evaluate all unwind-blocks as specified in Block>>valueNowOrOnUnwind: |
69 | 1155 |
and Block>>valueOnUnwindDo: on the way. |
141 | 1156 |
|
1157 |
LIMITATION: |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1158 |
currently a context can only be unwound by |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1159 |
the owning process - not from outside. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1160 |
i.e. it is not possible for one thread to unwind |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1161 |
another threads context - which does not make sense anyway. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1162 |
However, you can force another thread to do this in its own process |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1163 |
context, by giving it an interrupt action - this does make sense. |
1 | 1164 |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1165 |
Also, the compiler has an option (+optcontext) to create |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1166 |
non-returnable contexts (which are faster). |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1167 |
If such a context is restarted, a runtime error is raised." |
1 | 1168 |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1169 |
|con| |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1170 |
|
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1171 |
self senderIsNil ifFalse:[ |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1172 |
con := thisContext evaluateUnwindActionsUpTo:self. |
141 | 1173 |
]. |
1 | 1174 |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1175 |
"oops, if nil, I am not on the calling chain; |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1176 |
(bad bad, unwind action have already been performed. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1177 |
should we check for this situation first and NOT evaluate |
141 | 1178 |
the unwind actions in this case ?) |
1179 |
" |
|
69 | 1180 |
con isNil ifTrue:[ |
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1181 |
" |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1182 |
tried to return to a context which is already dead |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1183 |
(i.e. the method/block has already executed a return) |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1184 |
" |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1185 |
^ self invalidReturnOrRestartError:#'unwind:' with:value |
69 | 1186 |
]. |
141 | 1187 |
" |
1188 |
now, that all unwind-actions are done, I can use the |
|
1189 |
low-level return ... |
|
1190 |
" |
|
1191 |
^ self return:value |
|
1192 |
! |
|
1193 |
||
1194 |
unwindAndRestart |
|
1195 |
"restart the receiver - i.e. the method is evaluated again. |
|
402 | 1196 |
if the context to restart already died report an error. |
141 | 1197 |
Evaluate all unwind-blocks as specified in Block>>valueNowOrOnUnwind: |
1198 |
and Block>>valueOnUnwindDo: before restarting. |
|
1199 |
||
1200 |
LIMITATION: |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1201 |
a context can only be restarted by |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1202 |
the owning process - not from outside. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1203 |
i.e. it is not possible for one thread to unwindAndRestart |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1204 |
another threads context - which does not make sense anyway. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1205 |
However, you can force another thread to do this in its own process |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1206 |
context, by giving it an interrupt action - this does make sense. |
141 | 1207 |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1208 |
Also, the compiler has an option (+optcontext) to create |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1209 |
non-restartable contexts (which are faster). |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1210 |
If such a context is restarted, a runtime error is raised." |
552
694ecccaa1a0
only evaluate unwind blocks once
Claus Gittinger <cg@exept.de>
parents:
536
diff
changeset
|
1211 |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1212 |
|con| |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1213 |
|
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1214 |
self senderIsNil ifFalse:[ |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1215 |
con := thisContext evaluateUnwindActionsUpTo:self. |
141 | 1216 |
]. |
1217 |
||
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1218 |
"oops, if nil, I am not on the calling chain; |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1219 |
(bad bad, unwind action have already been performed. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1220 |
should we check for this situation first and NOT evaluate |
141 | 1221 |
the unwind actions in this case ?) |
1222 |
" |
|
1223 |
con isNil ifTrue:[ |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1224 |
" |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1225 |
tried to return to a context which is already dead |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1226 |
(i.e. the method/block has already executed a return) |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1227 |
" |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1228 |
^ self invalidReturnOrRestartError:#'unwindAndRestart:' with:nil |
141 | 1229 |
]. |
1230 |
" |
|
1231 |
now, that all unwind-actions are done, I can use the |
|
1232 |
low-level restart ... |
|
1233 |
" |
|
1234 |
^ self restart |
|
328 | 1235 |
! |
1236 |
||
4485 | 1237 |
unwindAndResume:value |
1238 |
"resume execution in the the receiver - i.e. simulate a '^ value' |
|
1239 |
from whatever it called last. |
|
1240 |
If the context has already returned , report an error. |
|
1241 |
Evaluate all unwind-blocks as specified in Block>>valueNowOrOnUnwind: |
|
1242 |
and Block>>valueOnUnwindDo: on the way. |
|
1243 |
||
1244 |
LIMITATION: |
|
1245 |
currently a context can only be unwound by |
|
1246 |
the owning process - not from outside. |
|
1247 |
i.e. it is not possible for one thread to unwind |
|
1248 |
another threads context - which does not make sense anyway. |
|
1249 |
However, you can force another thread to do this in its own process |
|
1250 |
context, by giving it an interrupt action - this does make sense. |
|
1251 |
||
1252 |
Also, the compiler has an option (+optcontext) to create |
|
1253 |
non-returnable contexts (which are faster). |
|
1254 |
If such a context is restarted, a runtime error is raised." |
|
1255 |
||
1256 |
|con| |
|
1257 |
||
1258 |
self senderIsNil ifFalse:[ |
|
1259 |
con := thisContext evaluateUnwindActionsUpTo:self. |
|
1260 |
]. |
|
1261 |
||
1262 |
"oops, if nil, I am not on the calling chain; |
|
1263 |
(bad bad, unwind action have already been performed. |
|
1264 |
should we check for this situation first and NOT evaluate |
|
1265 |
the unwind actions in this case ?) |
|
1266 |
" |
|
1267 |
con isNil ifTrue:[ |
|
1268 |
" |
|
1269 |
tried to return to a context which is already dead |
|
1270 |
(i.e. the method/block has already executed a return) |
|
1271 |
" |
|
1272 |
^ self invalidReturnOrRestartError:#'unwindAndResume:' with:value |
|
1273 |
]. |
|
1274 |
" |
|
1275 |
now, that all unwind-actions are done, I can use the |
|
1276 |
low-level resume ... |
|
1277 |
" |
|
1278 |
^ self resume:value |
|
1279 |
! |
|
1280 |
||
328 | 1281 |
unwindThenDo:aBlock |
1282 |
"return the value of aBlock from the receiver - i.e. simulate a '^ aBlock value'. |
|
360 | 1283 |
If the context has already returned , report an error. |
328 | 1284 |
Evaluate all unwind-blocks as specified in Block>>valueNowOrOnUnwind: |
1285 |
and Block>>valueOnUnwindDo: on the way. |
|
1286 |
The block is evaluated AFTER all unwind actions are performed |
|
1287 |
(i.e. the blocks sender will be the receiving context, not the |
|
402 | 1288 |
currently executing context) |
328 | 1289 |
|
1290 |
LIMITATION: |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1291 |
currently a context can only be unwound by |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1292 |
the owning process - not from outside |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1293 |
i.e. it is not possible for one thread to unwindThenDo |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1294 |
another threads context - which does not make sense anyway. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1295 |
However, you can force another thread to do this in its own process |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1296 |
context, by giving it an interrupt action - this does make sense. |
328 | 1297 |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1298 |
Also, the compiler has an option (+optcontext) to create |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1299 |
non-returnable contexts (which are faster). |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1300 |
If such a context is restarted, a runtime error is raised." |
328 | 1301 |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1302 |
|con| |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1303 |
|
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1304 |
self senderIsNil ifFalse:[ |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1305 |
con := thisContext evaluateUnwindActionsUpTo:self. |
328 | 1306 |
]. |
1307 |
||
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1308 |
"oops, if nil, I am not on the calling chain; |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1309 |
(bad bad, unwind action have already been performed. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1310 |
should we check for this situation first and NOT evaluate |
328 | 1311 |
the unwind actions in this case ?) |
1312 |
" |
|
1313 |
con isNil ifTrue:[ |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1314 |
" |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1315 |
tried to return to a context which is already dead |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1316 |
(i.e. the method/block has already executed a return) |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1317 |
" |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1318 |
^ self invalidReturnOrRestartError:#'unwindThenDo:' with:aBlock |
328 | 1319 |
]. |
1320 |
" |
|
1321 |
now, that all unwind-actions are done, I can use the |
|
1322 |
low-level return ... |
|
1323 |
" |
|
1324 |
^ self returnDoing:aBlock |
|
1 | 1325 |
! ! |
623 | 1326 |
|
1327 |
!Context methodsFor:'printing & storing'! |
|
1328 |
||
1070
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1329 |
argStringFor:someObject |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1330 |
|
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1331 |
|name| |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1332 |
%{ |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1333 |
/* |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1334 |
* special handling for (invalid) free objects. |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1335 |
* these only appear if some primitiveCode does not correctly use SEND macros, |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1336 |
* which may lead to sends to free objects. In normal operation, this 'cannot' happen. |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1337 |
*/ |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1338 |
if (__isNonNilObject(someObject) && (__qClass(someObject)==nil)) { |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1339 |
name = __MKSTRING("FreeObject"); |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1340 |
} |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1341 |
%}. |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1342 |
name notNil ifTrue:[^ name]. |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1343 |
^ someObject displayString |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1344 |
! |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1345 |
|
623 | 1346 |
argsDisplayString |
1347 |
|fullString n "{ Class: SmallInteger }" | |
|
1348 |
||
1349 |
fullString := ''. |
|
1350 |
n := self numArgs. |
|
1351 |
1 to:n do:[:index | |
|
1070
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1352 |
fullString := fullString , ' ' , (self argStringFor:(self at:index)) |
623 | 1353 |
]. |
1354 |
^ fullString |
|
1355 |
! |
|
1356 |
||
1357 |
displayString |
|
1358 |
"return a string describing the context - for display in Inspector" |
|
1359 |
||
1360 |
^ self class name , '(' , self printString , ')' |
|
1361 |
! |
|
1362 |
||
1363 |
fullPrintString |
|
1364 |
"return a string describing the context - this includes the linenumber, |
|
1365 |
receiver printString and argument printString" |
|
1366 |
||
1367 |
|s| |
|
1368 |
||
1369 |
s := WriteStream on:String new. |
|
1370 |
s nextPutAll:self receiverPrintString; space; nextPutAll:selector. |
|
1371 |
self size ~~ 0 ifTrue: [ |
|
1372 |
s space. |
|
1373 |
s nextPutAll:self argsDisplayString |
|
1374 |
]. |
|
1375 |
s nextPutAll:' ['; nextPutAll:self lineNumber printString; nextPutAll:']' . |
|
1376 |
^ s contents |
|
1377 |
||
1378 |
" |
|
1379 |
thisContext fullPrintString |
|
1380 |
" |
|
1381 |
! |
|
1382 |
||
1383 |
methodPrintString |
|
1384 |
"return a string describing the contexts method as 'implementorClass>>selector'" |
|
1385 |
||
1853
09cd1e8df9a2
use new Method>>who interface
Claus Gittinger <cg@exept.de>
parents:
1810
diff
changeset
|
1386 |
|mthd who| |
623 | 1387 |
|
1388 |
mthd := self method. |
|
1389 |
mthd notNil ifTrue:[ |
|
3143 | 1390 |
who := mthd who. |
1391 |
who notNil ifTrue:[ |
|
1392 |
^ who methodClass name , '>>' , who methodSelector |
|
1393 |
] |
|
623 | 1394 |
]. |
1395 |
^ mthd displayString. |
|
1396 |
||
1397 |
" |
|
1398 |
thisContext methodPrintString |
|
1399 |
thisContext sender methodPrintString |
|
1400 |
" |
|
1853
09cd1e8df9a2
use new Method>>who interface
Claus Gittinger <cg@exept.de>
parents:
1810
diff
changeset
|
1401 |
|
09cd1e8df9a2
use new Method>>who interface
Claus Gittinger <cg@exept.de>
parents:
1810
diff
changeset
|
1402 |
"Modified: 1.11.1996 / 16:21:49 / cg" |
623 | 1403 |
! |
1404 |
||
1405 |
printOn:aStream |
|
1406 |
"append a printed description of the receiver onto aStream" |
|
1407 |
||
1408 |
aStream nextPutAll:(self receiverPrintString). |
|
1409 |
aStream space. |
|
4393 | 1410 |
self selector printOn:aStream. |
1411 |
aStream space. |
|
1412 |
aStream nextPutAll:' ['; nextPutAll:self lineNumber printString; nextPutAll:']' . |
|
1413 |
||
623 | 1414 |
! |
1415 |
||
1416 |
receiverPrintString |
|
1417 |
"return a string describing the receiver of the context" |
|
1418 |
||
1419 |
|receiverClass receiverClassName newString implementorClass| |
|
1420 |
||
1070
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1421 |
%{ |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1422 |
/* |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1423 |
* special handling for (invalid) free objects. |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1424 |
* these only appear if some primitiveCode does not correctly use SEND macros, |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1425 |
* which may lead to sends to free objects. In normal operation, this 'cannot' happen. |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1426 |
*/ |
1133 | 1427 |
if (__isNonNilObject(__INST(receiver)) && (__qClass(__INST(receiver))==nil)) { |
3923 | 1428 |
receiverClassName = __MKSTRING("FreeObject"); |
1070
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1429 |
} |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1430 |
%}. |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1431 |
receiverClassName notNil ifTrue:[^ receiverClassName]. |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1432 |
|
623 | 1433 |
receiverClass := receiver class. |
3923 | 1434 |
receiverClass isJavaClass ifTrue:[ |
1435 |
receiverClassName := receiverClass displayString |
|
1436 |
] ifFalse:[ |
|
1437 |
(receiverClass isBehavior |
|
1438 |
and:[receiverClass isMeta |
|
1439 |
and:[receiverClass soleInstance isJavaClass]]) ifTrue:[ |
|
1440 |
"/ receiverClassName := receiverClass soleInstance fullName. |
|
1441 |
receiverClassName := receiverClass name. |
|
1442 |
] ifFalse:[ |
|
1443 |
receiverClassName := receiverClass name. |
|
1444 |
] |
|
1445 |
]. |
|
623 | 1446 |
(receiverClass == SmallInteger) ifTrue:[ |
3923 | 1447 |
newString := '(' , receiver printString , ') ' , receiverClassName |
623 | 1448 |
] ifFalse:[ |
3923 | 1449 |
newString := receiverClassName |
623 | 1450 |
]. |
1451 |
||
1452 |
selector notNil ifTrue:[ |
|
1453 |
"/ implementorClass := self searchClass whichClassIncludesSelector:selector. |
|
1454 |
||
3923 | 1455 |
" |
1456 |
kludge to avoid slow search for containing class |
|
1457 |
" |
|
1458 |
(selector ~~ #doIt and:[selector ~~ #doIt:]) ifTrue:[ |
|
1459 |
implementorClass := self methodClass. |
|
1460 |
]. |
|
1461 |
||
1462 |
implementorClass notNil ifTrue: [ |
|
1463 |
(implementorClass ~~ receiverClass) ifTrue: [ |
|
1464 |
newString := newString , '>>>', |
|
1465 |
implementorClass name printString |
|
1466 |
] |
|
1467 |
] ifFalse:[ |
|
1468 |
self searchClass ~~ receiverClass ifTrue:[ |
|
1469 |
newString := newString , '>>>' , self searchClass name |
|
1470 |
]. |
|
1471 |
" |
|
1472 |
kludge for doIt - these unbound methods are not |
|
1473 |
found in the classes methodDictionary |
|
1474 |
" |
|
1475 |
(selector ~~ #doIt and:[selector ~~ #doIt:]) ifTrue:[ |
|
1476 |
newString := newString , '>>>**NONE**' |
|
1477 |
] |
|
1478 |
] |
|
623 | 1479 |
]. |
1480 |
||
1481 |
^ newString |
|
1482 |
! ! |
|
1483 |
||
1484 |
!Context methodsFor:'private accessing'! |
|
1485 |
||
4464
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1486 |
markForHandle |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1487 |
"set the mark for exception handle flag in the receiver. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1488 |
The VM needs this to know that some special action is to be performed with |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1489 |
this context - a highly internal mechanism and not for public use." |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1490 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1491 |
%{ /* NOCONTEXT */ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1492 |
__INST(flags) = (OBJ)((INT)__INST(flags) | __MASKSMALLINT(__HANDLE_MARK)); |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1493 |
%} |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1494 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1495 |
"Modified: 13.12.1995 / 19:05:22 / cg" |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1496 |
! |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1497 |
|
753
81d54fc53a18
added mechanism to force a stepInterrupt whenever a context returns or unwinds
Claus Gittinger <cg@exept.de>
parents:
749
diff
changeset
|
1498 |
markForInterrupt |
81d54fc53a18
added mechanism to force a stepInterrupt whenever a context returns or unwinds
Claus Gittinger <cg@exept.de>
parents:
749
diff
changeset
|
1499 |
"set the interrupt flag. |
81d54fc53a18
added mechanism to force a stepInterrupt whenever a context returns or unwinds
Claus Gittinger <cg@exept.de>
parents:
749
diff
changeset
|
1500 |
The VM needs this to know that some special action is to be performed with |
81d54fc53a18
added mechanism to force a stepInterrupt whenever a context returns or unwinds
Claus Gittinger <cg@exept.de>
parents:
749
diff
changeset
|
1501 |
this context upon return - a highly internal mechanism and not for public use." |
81d54fc53a18
added mechanism to force a stepInterrupt whenever a context returns or unwinds
Claus Gittinger <cg@exept.de>
parents:
749
diff
changeset
|
1502 |
|
81d54fc53a18
added mechanism to force a stepInterrupt whenever a context returns or unwinds
Claus Gittinger <cg@exept.de>
parents:
749
diff
changeset
|
1503 |
%{ /* NOCONTEXT */ |
81d54fc53a18
added mechanism to force a stepInterrupt whenever a context returns or unwinds
Claus Gittinger <cg@exept.de>
parents:
749
diff
changeset
|
1504 |
__markInterrupted(__ContextInstPtr(self)); |
81d54fc53a18
added mechanism to force a stepInterrupt whenever a context returns or unwinds
Claus Gittinger <cg@exept.de>
parents:
749
diff
changeset
|
1505 |
%} |
81d54fc53a18
added mechanism to force a stepInterrupt whenever a context returns or unwinds
Claus Gittinger <cg@exept.de>
parents:
749
diff
changeset
|
1506 |
! |
81d54fc53a18
added mechanism to force a stepInterrupt whenever a context returns or unwinds
Claus Gittinger <cg@exept.de>
parents:
749
diff
changeset
|
1507 |
|
1727 | 1508 |
markForInterruptOnUnwind |
1509 |
"set the interrupt-on-unwind flag in the receiver. |
|
1510 |
The VM will generate a stepInterrupt, when this context returns or |
|
1511 |
is unwound. This is used by the debugger for faster single-stepping; |
|
1512 |
- a highly internal mechanism and not for public use." |
|
1513 |
||
1514 |
%{ /* NOCONTEXT */ |
|
3508 | 1515 |
__INST(flags) = (OBJ)((INT)__INST(flags) | __MASKSMALLINT(__IRQ_ON_UNWIND)); |
1727 | 1516 |
%} |
1517 |
! |
|
1518 |
||
4464
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1519 |
markForRaise |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1520 |
"set the mark for exception raise flag in the receiver. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1521 |
The VM needs this to know that some special action is to be performed with |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1522 |
this context - a highly internal mechanism and not for public use." |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1523 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1524 |
%{ /* NOCONTEXT */ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1525 |
__INST(flags) = (OBJ)((INT)__INST(flags) | __MASKSMALLINT(__RAISE_MARK)); |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1526 |
%} |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1527 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1528 |
"Modified: 13.12.1995 / 19:05:22 / cg" |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1529 |
! |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1530 |
|
623 | 1531 |
markForUnwind |
749 | 1532 |
"set the mark for unwind flag in the receiver. |
1533 |
The VM needs this to know that some special action is to be performed with |
|
1534 |
this context - a highly internal mechanism and not for public use." |
|
1535 |
||
623 | 1536 |
%{ /* NOCONTEXT */ |
1133 | 1537 |
__INST(flags) = (OBJ)((INT)__INST(flags) | __MASKSMALLINT(__UNWIND_MARK)); |
623 | 1538 |
%} |
749 | 1539 |
|
1540 |
"Modified: 13.12.1995 / 19:05:22 / cg" |
|
623 | 1541 |
! |
1542 |
||
1543 |
unmarkForUnwind |
|
749 | 1544 |
"clear the mark for unwind flag in the receiver. |
1545 |
The VM needs this to know that some special action is to be performed with |
|
1546 |
this context - a highly internal mechanism and not for public use." |
|
1547 |
||
623 | 1548 |
%{ /* NOCONTEXT */ |
1133 | 1549 |
__INST(flags) = (OBJ)((INT)__INST(flags) & ~__MASKSMALLINT(__UNWIND_MARK)); |
623 | 1550 |
%} |
1551 |
! ! |
|
1552 |
||
4464
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1553 |
!Context methodsFor:'searching'! |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1554 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1555 |
findNextContextWithSelector:selector1 or:selector2 or:selector3 |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1556 |
"walk along the sender chain (starting with the sender), |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1557 |
for a context with either one of the given selectors. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1558 |
This non-standard interface is only to be used by exception" |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1559 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1560 |
"/ this could have been (actually: was) implemented as: |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1561 |
"/ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1562 |
"/ |con| |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1563 |
"/ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1564 |
"/ con := self sender. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1565 |
"/ [con notNil] whileTrue:[ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1566 |
"/ con selector == aSelector ifTrue:[^ con]. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1567 |
"/ con := con sender. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1568 |
"/ ]. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1569 |
"/ ^ nil |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1570 |
"/ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1571 |
"/ and the code below does exactly this (somewhat faster, though). |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1572 |
"/ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1573 |
"/ (it avoids referencing all intermediate contexts, which would mark them special, |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1574 |
"/ although they aren't really - this is expert knowledge, no need to understand that ...) |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1575 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1576 |
%{ /* NOCONTEXT */ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1577 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1578 |
OBJ theContext; |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1579 |
OBJ sel; |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1580 |
OBJ __FETCHSELECTOR(); |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1581 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1582 |
theContext = __INST(sender_); |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1583 |
while (__isNonNilObject(theContext)) { |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1584 |
if (__isLazy(theContext)) { |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1585 |
#ifdef TRADITIONAL_STACK_FRAME |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1586 |
sel = __FETCHSELECTOR(theContext); |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1587 |
#else |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1588 |
/* mhmh - not really needed */ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1589 |
__PATCHUPCONTEXT(theContext); |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1590 |
sel = __ContextInstPtr(theContext)->c_selector; |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1591 |
#endif |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1592 |
} else { |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1593 |
sel = __ContextInstPtr(theContext)->c_selector; |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1594 |
} |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1595 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1596 |
if ((sel == selector1) |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1597 |
|| ((selector2 != nil) && (sel == selector2)) |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1598 |
|| ((selector3 != nil) && (sel == selector3))) { |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1599 |
if (__isLazy(theContext)) { |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1600 |
__PATCHUPCONTEXT(theContext); |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1601 |
} |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1602 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1603 |
if (! __isNonLIFO(theContext)) { |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1604 |
/* |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1605 |
* to be prepared for the worst situation |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1606 |
* (the sender is not stored, so the trap wont catch it) |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1607 |
* make the writeBarrier trigger manually. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1608 |
* We'll see, if this is really required. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1609 |
*/ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1610 |
theContext->o_space |= CATCHMARK; |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1611 |
_markNonLIFO(theContext); |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1612 |
} |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1613 |
RETURN (theContext); |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1614 |
} |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1615 |
theContext = __ContextInstPtr(theContext)->c_sender; |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1616 |
} |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1617 |
%}. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1618 |
^ nil |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1619 |
! |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1620 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1621 |
findNextUnwindContextOr:aContext |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1622 |
"walk along the sender chain (starting at the sender), |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1623 |
for a context marked for unwindAction or aContext. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1624 |
This non-standard interface is only to be used by mySelf" |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1625 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1626 |
"/ this could have been (actually: was) implemented as: |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1627 |
"/ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1628 |
"/ |con| |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1629 |
"/ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1630 |
"/ con := self sender. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1631 |
"/ [con notNil |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1632 |
"/ and:[con ~~ aContext |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1633 |
"/ and:[con isUnwindContext not]]] whileTrue:[con := con sender]. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1634 |
"/ ^ con |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1635 |
"/ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1636 |
"/ and the code below does exactly this (somewhat faster, though). |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1637 |
"/ (it avoids referencing all intermediate contexts, which would mark them special, |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1638 |
"/ although they aren't really - this is expert knowledge, no need to understand that ...) |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1639 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1640 |
%{ /* NOCONTEXT */ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1641 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1642 |
OBJ theContext; |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1643 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1644 |
if (self == aContext) { |
4485 | 1645 |
RETURN (self); |
4464
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1646 |
} |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1647 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1648 |
theContext = __INST(sender_); |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1649 |
while (__isNonNilObject(theContext)) { |
4485 | 1650 |
if ((theContext == aContext) |
1651 |
|| ((INT)(__ContextInstPtr(theContext)->c_flags) & __MASKSMALLINT(__UNWIND_MARK))) { |
|
1652 |
if (__isLazy(theContext)) { |
|
1653 |
__PATCHUPCONTEXT(theContext); |
|
1654 |
} |
|
1655 |
if (! __isNonLIFO(theContext)) { |
|
1656 |
/* |
|
1657 |
* to be prepared for the worst situation |
|
1658 |
* (the sender is not stored, so the trap wont catch it) |
|
1659 |
* make the writeBarrier trigger manually. |
|
1660 |
* We'll see, if this is really required. |
|
1661 |
*/ |
|
1662 |
theContext->o_space |= CATCHMARK; |
|
1663 |
#if 0 |
|
1664 |
_markNonLIFO(theContext); |
|
1665 |
#endif |
|
1666 |
} |
|
1667 |
RETURN (theContext); |
|
1668 |
} |
|
1669 |
theContext = __ContextInstPtr(theContext)->c_sender; |
|
4464
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1670 |
} |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1671 |
%}. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1672 |
^ nil |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1673 |
! |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1674 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1675 |
findSpecialHandle:findHandleContext raise:findRaiseContext |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1676 |
"walk along the sender chain (starting with the sender), |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1677 |
for a context which is marked as handle or raise context. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1678 |
This non-standard interface is only to be used by exception" |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1679 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1680 |
"/ this could have been (actually: was) implemented as: |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1681 |
"/ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1682 |
"/ |con| |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1683 |
"/ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1684 |
"/ con := self sender. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1685 |
"/ [con notNil] whileTrue:[ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1686 |
"/ (findHandleContext and:[con isHandleContext]) ifTrue:[^con]. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1687 |
"/ (findRaiseContext and:[con isRaiseContext]) ifTrue:[^con]. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1688 |
"/ con := con sender. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1689 |
"/ ]. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1690 |
"/ ^ nil |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1691 |
"/ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1692 |
"/ and the code below does exactly this (somewhat faster, though). |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1693 |
"/ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1694 |
"/ (it avoids referencing all intermediate contexts, which would mark them special, |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1695 |
"/ although they aren't really - this is expert knowledge, no need to understand that ...) |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1696 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1697 |
%{ /* NOCONTEXT */ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1698 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1699 |
OBJ theContext; |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1700 |
OBJ sel; |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1701 |
OBJ __FETCHSELECTOR(); |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1702 |
int flagMask = 0; |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1703 |
INT mask; |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1704 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1705 |
if (findHandleContext == true) |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1706 |
flagMask = __HANDLE_MARK; |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1707 |
if (findRaiseContext == true) |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1708 |
flagMask |= __RAISE_MARK; |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1709 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1710 |
mask = __MASKSMALLINT(flagMask); |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1711 |
theContext = __INST(sender_); |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1712 |
while (__isNonNilObject(theContext)) { |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1713 |
if ((INT)(__ContextInstPtr(theContext)->c_flags) & mask) { |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1714 |
if (__isLazy(theContext)) { |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1715 |
__PATCHUPCONTEXT(theContext); |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1716 |
} |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1717 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1718 |
if (! __isNonLIFO(theContext)) { |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1719 |
/* |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1720 |
* to be prepared for the worst situation |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1721 |
* (the sender is not stored, so the trap won't catch it) |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1722 |
* make the writeBarrier trigger manually. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1723 |
* We'll see, if this is really required. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1724 |
*/ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1725 |
theContext->o_space |= CATCHMARK; |
4485 | 1726 |
#if 0 |
4464
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1727 |
_markNonLIFO(theContext); |
4485 | 1728 |
#endif |
4464
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1729 |
} |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1730 |
RETURN (theContext); |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1731 |
} |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1732 |
theContext = __ContextInstPtr(theContext)->c_sender; |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1733 |
} |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1734 |
%}. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1735 |
^ nil |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1736 |
! ! |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1737 |
|
1051 | 1738 |
!Context methodsFor:'special accessing'! |
1739 |
||
4557 | 1740 |
canResume |
1741 |
"return true, if the receiver allows to be resumed. |
|
1742 |
Due to the implementation, this requires that the context which |
|
1743 |
is right below the receiver is returnable." |
|
1744 |
||
1745 |
|theContext| |
|
1746 |
||
1747 |
" |
|
1748 |
starting with this context, find the one below |
|
1749 |
(i.e. the one that I have called) and return from it. |
|
1750 |
" |
|
1751 |
%{ |
|
1752 |
OBJ sndr; |
|
1753 |
||
1754 |
theContext = __thisContext; |
|
1755 |
while (theContext != nil) { |
|
1756 |
sndr = __ContextInstPtr(theContext)->c_sender; |
|
1757 |
if (sndr == self) break; |
|
1758 |
theContext = sndr; |
|
1759 |
} |
|
1760 |
if (theContext != nil) { |
|
1761 |
if (__isLazy(theContext)) { |
|
1762 |
__PATCHUPCONTEXT(theContext); |
|
1763 |
} |
|
1764 |
} |
|
1765 |
%}. |
|
1766 |
theContext isNil ifTrue:[ |
|
1767 |
^ false |
|
1768 |
]. |
|
1769 |
^ theContext canReturn |
|
1770 |
! |
|
1771 |
||
1051 | 1772 |
canReturn |
1773 |
"return true, if the receiver allows returning through it. |
|
4557 | 1774 |
Blocks, (currently) always return false. |
2646 | 1775 |
Methods which contain a (non-inlined) block are always |
1776 |
returnable - for other methods, it depends on how the system |
|
1777 |
was compiled (stc flag +/-optContext). |
|
1778 |
If it was compiled with +optContext, methods are compiled |
|
4557 | 1779 |
non returnable, unless a return-pragma was present in the method. |
2646 | 1780 |
Since this saves some administrative work in every method |
1781 |
invocation and makes overall execution faster, the system classes |
|
1782 |
are all compiled with this flag turned on." |
|
1051 | 1783 |
|
1784 |
%{ /* NOCONTEXT */ |
|
1785 |
||
3508 | 1786 |
RETURN ( ((INT)(__INST(flags)) & __MASKSMALLINT(__CANNOT_RETURN)) ? false : true ); |
1051 | 1787 |
%} |
1788 |
! |
|
1789 |
||
1492 | 1790 |
hasStackToShow |
2646 | 1791 |
"private interface to the debugger. |
1792 |
Smalltalk contexts return false here - other language frames |
|
1793 |
(i.e. Java frames) may want to show the evaluation stack" |
|
1794 |
||
1492 | 1795 |
^ false |
1796 |
||
1797 |
"Created: 28.6.1996 / 14:48:39 / cg" |
|
2646 | 1798 |
"Modified: 13.5.1997 / 16:31:12 / cg" |
1492 | 1799 |
! |
1800 |
||
4464
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1801 |
isHandleContext |
4505 | 1802 |
"return true, if this is a context with exception-handle flag set" |
4464
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1803 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1804 |
%{ /* NOCONTEXT */ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1805 |
RETURN ( ((INT)__INST(flags) & __MASKSMALLINT(__HANDLE_MARK)) ? true : false ); |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1806 |
%} |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1807 |
! |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1808 |
|
1051 | 1809 |
isNonLifo |
2646 | 1810 |
"return true, if this is a nonLifo context. |
1811 |
A nonLifo context is one that is still on the machine stack, |
|
1812 |
but has a reference taken and needs to be converted to a real |
|
1813 |
object (in objectMemory) when the method/block returns. |
|
1814 |
You dont have to understand this - this is a special ST/X |
|
1815 |
debug query, which may be removed without notice." |
|
1051 | 1816 |
|
1817 |
%{ /* NOCONTEXT */ |
|
1133 | 1818 |
RETURN ( ((INT)__INST(flags) & __MASKSMALLINT(__NONLIFO)) ? true : false ); |
1051 | 1819 |
%} |
1820 |
! |
|
1821 |
||
1822 |
isOnMachineStack |
|
1823 |
"return true, if this is a machine stack context as opposed to a |
|
2646 | 1824 |
real heap context. |
1825 |
You dont have to understand this - this is a special ST/X |
|
1826 |
debug query, which may be removed without notice." |
|
1051 | 1827 |
|
1828 |
%{ /* NOCONTEXT */ |
|
1829 |
RETURN ( (__qSpace(self) >= STACKSPACE) ? true : false ); |
|
1830 |
%} |
|
1831 |
! |
|
1832 |
||
4464
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1833 |
isRaiseContext |
4505 | 1834 |
"return true, if this is a context with exception-raise flag set" |
4464
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1835 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1836 |
%{ /* NOCONTEXT */ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1837 |
RETURN ( ((INT)__INST(flags) & __MASKSMALLINT(__RAISE_MARK)) ? true : false ); |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1838 |
%} |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1839 |
! |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1840 |
|
1051 | 1841 |
isSpecial |
1842 |
"return true, if this is either a nonLifo or interrupted context" |
|
1843 |
||
1844 |
%{ /* NOCONTEXT */ |
|
1133 | 1845 |
RETURN ( ((INT)__INST(flags) & __MASKSMALLINT(__SPECIAL)) ? true : false ); |
1051 | 1846 |
%} |
1847 |
! |
|
1848 |
||
1849 |
isUnwindContext |
|
1850 |
"return true, if this is an unwindContext" |
|
1851 |
||
1852 |
%{ /* NOCONTEXT */ |
|
1133 | 1853 |
RETURN ( ((INT)__INST(flags) & __MASKSMALLINT(__UNWIND_MARK)) ? true : false ); |
1051 | 1854 |
%} |
1855 |
! ! |
|
1856 |
||
623 | 1857 |
!Context methodsFor:'testing'! |
1858 |
||
1859 |
isBlockContext |
|
1860 |
"return true, iff the receiver is a BlockContext, false otherwise" |
|
1861 |
||
1862 |
^ false |
|
1863 |
! |
|
1864 |
||
1865 |
isContext |
|
1866 |
"return true, iff the receiver is a Context, false otherwise" |
|
1867 |
||
1868 |
^ true |
|
1869 |
! |
|
1870 |
||
1871 |
isRecursive |
|
1872 |
"return true, if this context is one of a recursive send of the same |
|
1483 | 1873 |
selector to the same receiver before. |
1874 |
Here, different arguments are ignored - i.e. only the same method |
|
1875 |
counts for recursiveness. |
|
623 | 1876 |
Used to detect recursive errors or recursive printing - for example." |
1877 |
||
2291
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1878 |
|c count "{Class: SmallInteger }" myMethodsClass| |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1879 |
|
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1880 |
count := 0. |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1881 |
|
2893 | 1882 |
c := self findNextContextWithSelector:selector or:nil or:nil. |
623 | 1883 |
[c notNil] whileTrue:[ |
3143 | 1884 |
(c receiver == receiver) ifTrue:[ |
1885 |
" |
|
1886 |
stupid: the current ST/X context does not include |
|
1887 |
the method, but the class, in which the search started ... |
|
1888 |
" |
|
2291
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1889 |
myMethodsClass isNil ifTrue:[ |
3143 | 1890 |
myMethodsClass := self methodClass. |
2291
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1891 |
]. |
3143 | 1892 |
c methodClass == myMethodsClass ifTrue:[ |
1893 |
^ true |
|
1894 |
] |
|
1895 |
]. |
|
1896 |
c := c findNextContextWithSelector:selector or:nil or:nil. |
|
2135
6bd144c1c358
newStyle info & error messages
Claus Gittinger <cg@exept.de>
parents:
1853
diff
changeset
|
1897 |
|
3143 | 1898 |
" |
1899 |
this special test was added to get out after a while |
|
1900 |
if the sender chain is corrupt - this gives us at least |
|
1901 |
a chance to find those errors. |
|
1902 |
" |
|
1903 |
count := count + 1. |
|
1904 |
count >= 100000 ifTrue:[ |
|
1905 |
'Context [warning]: bad context chain' errorPrintCR. |
|
1906 |
^ true |
|
1907 |
] |
|
623 | 1908 |
]. |
1909 |
^ false |
|
1483 | 1910 |
|
2135
6bd144c1c358
newStyle info & error messages
Claus Gittinger <cg@exept.de>
parents:
1853
diff
changeset
|
1911 |
"Modified: 10.1.1997 / 17:34:26 / cg" |
623 | 1912 |
! ! |
1913 |
||
1810 | 1914 |
!Context class methodsFor:'documentation'! |
749 | 1915 |
|
1916 |
version |
|
4932 | 1917 |
^ '$Header: /cvs/stx/stx/libbasic/Context.st,v 1.102 1999-10-22 18:25:14 cg Exp $' |
749 | 1918 |
! ! |
623 | 1919 |
Context initialize! |