author | Claus Gittinger <cg@exept.de> |
Wed, 07 May 2003 16:06:30 +0200 | |
changeset 7257 | b9f0fb923c72 |
parent 6648 | 651b8f111a95 |
child 7261 | f35fc9cee675 |
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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"{ Package: 'stx:libbasic' }" |
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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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|
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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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[errors:] |
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CannotReturnError 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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"/ |
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CannotReturnError notifierString:'invalid return; method cannot return twice'. |
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CannotResumeError notifierString:'invalid resume'. |
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SingleStepInterruptRequest isNil ifTrue:[ |
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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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cannotResumeSignal |
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"return the signal used when a method is tried to be resumed, which cannot" |
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^ CannotResumeError |
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! |
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cannotReturnSignal |
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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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^ CannotReturnError |
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! |
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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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self obsoleteMethodWarning:'use #cannotReturnSignal'. |
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^ self cannotReturnSignal. |
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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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||
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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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232 |
%{ |
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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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||
243 |
||
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! ! |
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!Context methodsFor:'Compatibility - VW'! |
247 |
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resumeWith:value |
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"same as #resume: - visualWorks compatibility" |
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||
251 |
self resume:value |
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! ! |
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253 |
||
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!Context methodsFor:'accessing'! |
255 |
||
256 |
argAt:n |
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"return the n'th argument" |
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||
1726 | 259 |
n > self numArgs ifTrue:[ |
3143 | 260 |
^ self error:'invalid arg access' |
1726 | 261 |
]. |
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^ self at:n |
1726 | 263 |
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264 |
"Modified: 12.10.1996 / 21:44:28 / cg" |
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623 | 265 |
! |
266 |
||
267 |
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' |
1726 | 272 |
]. |
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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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%{ |
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__UNFIXCONTEXT(self, 0); |
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%}. |
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^ value |
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283 |
"Modified: 12.10.1996 / 21:44:32 / cg" |
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! |
285 |
||
286 |
args |
|
287 |
"return an array filled with the arguments of this context" |
|
288 |
||
289 |
|n| |
|
290 |
||
291 |
n := self numArgs. |
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3130 | 292 |
n == 0 ifTrue:[ |
293 |
"/ little optimization here - avaoid creating empty containers |
|
294 |
^ #() |
|
295 |
]. |
|
623 | 296 |
^ (Array new:n) replaceFrom:1 to:n with:self. |
297 |
! |
|
154 | 298 |
|
623 | 299 |
argsAndVars |
300 |
"return an array filled with the arguments and variables of this context" |
|
301 |
||
302 |
|n| |
|
303 |
||
1810 | 304 |
n := self numArgs + self numVars. |
3130 | 305 |
n == 0 ifTrue:[ |
3143 | 306 |
"/ little optimization here - avoid creating empty containers |
3130 | 307 |
^ #() |
308 |
]. |
|
623 | 309 |
^ (Array new:n) replaceFrom:1 to:n with:self. |
1810 | 310 |
|
311 |
"Modified: 23.10.1996 / 16:19:41 / cg" |
|
623 | 312 |
! |
154 | 313 |
|
623 | 314 |
home |
315 |
"return the immediate home of the receiver. |
|
316 |
for block contexts, this is the methodcontext, where the block was created, |
|
317 |
for nested block contexts, its the surrounding blocks context. |
|
318 |
for method-contexts this is nil." |
|
25 | 319 |
|
623 | 320 |
^ nil "home" |
321 |
! |
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1 | 322 |
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323 |
homeReceiver |
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|
324 |
"return the receiver from the context, where the receiver was defined" |
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Add #homeReceiver (as in ST80).
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325 |
|
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Add #homeReceiver (as in ST80).
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326 |
^ receiver |
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Add #homeReceiver (as in ST80).
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327 |
|
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Add #homeReceiver (as in ST80).
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|
328 |
"Created: / 5.3.1998 / 16:18:26 / stefan" |
0295f7b3b208
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329 |
! |
0295f7b3b208
Add #homeReceiver (as in ST80).
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|
330 |
|
1 | 331 |
instVarAt:index |
69 | 332 |
"have to catch instVar access to retVal and handle - they are invalid. |
333 |
Notice, that one of the next ST/X versions will get some syntactic |
|
334 |
extension to get this automatically)." |
|
1 | 335 |
|
3508 | 336 |
(index == 2) ifTrue:[^ self sender]."/ sender - must be accessed specially |
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337 |
(index == 8) ifTrue:[^ nil]. "/ retvalTemp - invisible |
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|
338 |
(index == 9) ifTrue:[^ nil]. "/ handle to machine stack - invisible |
1 | 339 |
^ super instVarAt:index |
340 |
! |
|
341 |
||
342 |
instVarAt:index put:value |
|
69 | 343 |
"have to catch instVar access to retVal and handle - they are invalid. |
344 |
Notice, that one of the next ST/X versions will get some syntactic |
|
345 |
extension to get this automatically)." |
|
1 | 346 |
|
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347 |
(index == 2) ifTrue:[^ nil]. "/ sender - not allowed to change |
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|
348 |
(index == 8) ifTrue:[^ nil]. "/ retvalTemp - not allowed to change |
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|
349 |
(index == 9) ifTrue:[^ nil]. "/ handle to machine stack - not allowed to change |
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|
350 |
super instVarAt:index put:value. |
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351 |
|
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parents:
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|
352 |
"/ need some aid for optimized code - |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
353 |
"/ 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
|
354 |
"/ the unfix updates the machine-stack version of the receiver. |
ef99343d6756
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parents:
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diff
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|
355 |
%{ |
4570 | 356 |
__UNFIXCONTEXT(self, 0); |
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ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
357 |
%}. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
358 |
^ value |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
359 |
|
1 | 360 |
! |
361 |
||
4328
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
362 |
javaLineNumber |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
363 |
|nr pc| |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
364 |
|
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
365 |
lineNr notNil ifTrue:[ |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
366 |
pc := lineNr bitAnd:16rFFFF. |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
367 |
]. |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
368 |
|
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
369 |
"/ '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
|
370 |
pc isNil ifTrue:[ |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
371 |
nr := self lineNumberFromMethod. |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
372 |
nr notNil ifTrue:[ |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
373 |
^ nr |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
374 |
]. |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
375 |
" '-> 0 [a]' printCR. " |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
376 |
^0 |
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 |
|
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
379 |
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
|
380 |
nr isNil ifTrue:[ |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
381 |
nr := self lineNumberFromMethod. |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
382 |
nr notNil ifTrue:[ |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
383 |
^ nr |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
384 |
]. |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
385 |
" '-> 0 [b]' printCR. " |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
386 |
^ 0 |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
387 |
]. |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
388 |
"/ '-> ' print. nr printCR. |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
389 |
^ nr. |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
390 |
|
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
391 |
! |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
392 |
|
623 | 393 |
lineNumber |
394 |
"this returns the lineNumber within the methods source, where the context was |
|
395 |
interrupted or called another method. (currently, sometimes this information |
|
396 |
is not available - in this case 0 is returned)" |
|
1 | 397 |
|
4464
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
398 |
|l| |
3923 | 399 |
|
4328
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
400 |
receiver isJavaObject ifTrue:[ |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
401 |
"/ 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
|
402 |
self method isJavaMethod ifTrue:[ |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
403 |
^ self javaLineNumber |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
404 |
] |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
405 |
]. |
9cc10bae2f98
care for contexts which really ought to be java contexts
Claus Gittinger <cg@exept.de>
parents:
3923
diff
changeset
|
406 |
|
3923 | 407 |
lineNr notNil ifTrue:[ |
408 |
l := lineNr bitAnd:16rFFFF. |
|
409 |
]. |
|
410 |
||
4464
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
411 |
"/ self isJavaContext ifTrue:[ |nr m| |
3923 | 412 |
"/ m := self method. |
413 |
"/ l isNil ifTrue:[ |
|
414 |
"/ m notNil ifTrue:[ |
|
415 |
"/ nr := m lineNumber |
|
416 |
"/ ]. |
|
417 |
"/ nr notNil ifTrue:[ |
|
418 |
"/ ^ nr |
|
419 |
"/ ]. |
|
420 |
"/ ^0 |
|
421 |
"/ ]. |
|
422 |
"/ nr := self method lineNumberForPC:l. |
|
423 |
"/ nr isNil ifTrue:[ |
|
424 |
"/ m notNil ifTrue:[ |
|
425 |
"/ nr := m lineNumber |
|
426 |
"/ ]. |
|
427 |
"/ nr notNil ifTrue:[ |
|
428 |
"/ ^ nr |
|
429 |
"/ ]. |
|
430 |
"/ ^ 0 |
|
431 |
"/ ]. |
|
432 |
"/ ^ nr. |
|
433 |
"/ ]. |
|
434 |
||
435 |
^ l |
|
436 |
||
437 |
"Modified: / 10.11.1998 / 13:19:48 / cg" |
|
1 | 438 |
! |
439 |
||
4450 | 440 |
lineNumberFromMethod |
441 |
^ 1 |
|
442 |
! |
|
443 |
||
1 | 444 |
method |
54 | 445 |
"return the method for which the receiver was created. |
446 |
To save time during normal execution, this information is not held in the |
|
447 |
context, but computed here on request." |
|
1 | 448 |
|
3508 | 449 |
|c sender sendersSelector m| |
1 | 450 |
|
325 | 451 |
c := self searchClass. |
452 |
" |
|
453 |
the below cannot happen in normal circumstances |
|
454 |
(added to avoid recursive errors in case of a broken sender chain) |
|
455 |
" |
|
456 |
c isBehavior ifFalse:[ |
|
3143 | 457 |
'Context [error]: non class in searchClass' errorPrintCR. |
458 |
' selector: ' errorPrint. selector errorPrint. |
|
459 |
' receiver: ' errorPrint. receiver errorPrintCR. |
|
460 |
^ nil |
|
325 | 461 |
]. |
462 |
||
328 | 463 |
c := c whichClassIncludesSelector:selector. |
1 | 464 |
c notNil ifTrue:[ |
3143 | 465 |
^ c compiledMethodAt:selector |
1 | 466 |
]. |
216 | 467 |
|
3508 | 468 |
"mhmh - seems to be a context for an unbound method (as generated by doIt); |
216 | 469 |
look in the senders context. Consider this a kludge. |
3143 | 470 |
(maybe it was not too good of an idea to NOT keep the current |
471 |
method in the context ...) |
|
472 |
Future versions of ST/X's message lookup may store the method in |
|
473 |
the context. |
|
216 | 474 |
" |
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
475 |
sender := self sender. |
3143 | 476 |
sender notNil ifTrue:[ |
477 |
sendersSelector := sender selector. |
|
478 |
sendersSelector notNil ifTrue:[ |
|
479 |
(sendersSelector startsWith:'valueWithReceiver:') ifTrue:[ |
|
3508 | 480 |
m := sender receiver. |
481 |
m isMethod ifTrue:[ |
|
482 |
^ m |
|
483 |
] |
|
3143 | 484 |
] |
485 |
] |
|
216 | 486 |
]. |
487 |
||
1 | 488 |
^ nil |
2135
6bd144c1c358
newStyle info & error messages
Claus Gittinger <cg@exept.de>
parents:
1853
diff
changeset
|
489 |
|
3143 | 490 |
"Modified: / 4.1.1998 / 21:15:32 / cg" |
1 | 491 |
! |
492 |
||
212 | 493 |
methodClass |
494 |
"return the class in which the method for which the receiver was created is." |
|
495 |
||
1456 | 496 |
|cls m| |
497 |
||
498 |
cls := self searchClass. |
|
3923 | 499 |
(cls isMeta |
500 |
and:[cls soleInstance isJavaClass]) ifTrue:[ |
|
501 |
cls := cls soleInstance |
|
502 |
]. |
|
1456 | 503 |
|
3923 | 504 |
[cls notNil] whileTrue:[ |
505 |
cls := cls whichClassIncludesSelector:selector. |
|
506 |
cls isNil ifTrue:[^ nil]. |
|
507 |
||
508 |
m := cls compiledMethodAt:selector. |
|
509 |
m notNil ifTrue:[ |
|
510 |
m isIgnored ifFalse:[^ cls]. |
|
511 |
]. |
|
512 |
cls := cls superclass |
|
1456 | 513 |
]. |
514 |
^ cls |
|
515 |
||
3923 | 516 |
"Modified: / 5.11.1998 / 19:07:43 / cg" |
212 | 517 |
! |
518 |
||
623 | 519 |
methodHome |
520 |
"return the method-home - for method contexts this is the receiver" |
|
521 |
||
522 |
^ self |
|
523 |
! |
|
524 |
||
525 |
ntemp |
|
526 |
"return the number of temporary variables of the Block/Method. |
|
1810 | 527 |
(for debugging only). |
528 |
I dont like the name of this method; its here for compatibility." |
|
623 | 529 |
|
1810 | 530 |
^ self numTemps |
531 |
||
532 |
"Modified: 23.10.1996 / 16:19:06 / cg" |
|
623 | 533 |
! |
534 |
||
535 |
numArgs |
|
536 |
"return the number of arguments to the Block/Method" |
|
537 |
||
538 |
%{ /* NOCONTEXT */ |
|
539 |
||
1133 | 540 |
RETURN ( __MKSMALLINT( (__intVal(__INST(flags)) >> __NARG_SHIFT) & __NARG_MASK) ); |
623 | 541 |
%} |
542 |
! |
|
543 |
||
1810 | 544 |
numTemps |
545 |
"return the number of temporary variables of the Block/Method. |
|
546 |
(for debugging only)" |
|
547 |
||
548 |
^ self size - self numArgs - self numVars |
|
549 |
||
550 |
"Created: 23.10.1996 / 16:19:10 / cg" |
|
551 |
"Modified: 23.10.1996 / 16:19:48 / cg" |
|
552 |
! |
|
553 |
||
554 |
numVars |
|
623 | 555 |
"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
|
556 |
|
623 | 557 |
%{ /* NOCONTEXT */ |
558 |
||
1133 | 559 |
RETURN ( __MKSMALLINT( (__intVal(__INST(flags)) >> __NVAR_SHIFT) & __NVAR_MASK) ); |
623 | 560 |
%} |
561 |
! |
|
562 |
||
1810 | 563 |
nvars |
564 |
"return the number of local variables of the Block/Method. |
|
565 |
I dont like the name of this method; its here for compatibility." |
|
566 |
||
567 |
^ self numVars |
|
568 |
||
569 |
"Modified: 23.10.1996 / 16:18:44 / cg" |
|
570 |
! |
|
571 |
||
623 | 572 |
receiver |
573 |
"return the receiver of the context" |
|
574 |
||
575 |
^ receiver |
|
576 |
! |
|
577 |
||
4543 | 578 |
receiver:aCompiledCode |
579 |
"set the receiver of the message" |
|
580 |
||
4560
618151751813
Need _UNFIXCONTEXT() when changing receiver.
Stefan Vogel <sv@exept.de>
parents:
4557
diff
changeset
|
581 |
receiver := aCompiledCode. |
4543 | 582 |
|
4560
618151751813
Need _UNFIXCONTEXT() when changing receiver.
Stefan Vogel <sv@exept.de>
parents:
4557
diff
changeset
|
583 |
"/ need some aid for optimized code - |
618151751813
Need _UNFIXCONTEXT() when changing receiver.
Stefan Vogel <sv@exept.de>
parents:
4557
diff
changeset
|
584 |
"/ some machines have the arguments kept in register vars ... |
618151751813
Need _UNFIXCONTEXT() when changing receiver.
Stefan Vogel <sv@exept.de>
parents:
4557
diff
changeset
|
585 |
"/ 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
|
586 |
%{ |
4570 | 587 |
__UNFIXCONTEXT(self, 0); |
4560
618151751813
Need _UNFIXCONTEXT() when changing receiver.
Stefan Vogel <sv@exept.de>
parents:
4557
diff
changeset
|
588 |
%}. |
4543 | 589 |
|
590 |
! |
|
591 |
||
623 | 592 |
searchClass |
593 |
"this is the class where the method-lookup started; |
|
594 |
for normal sends, it is nil (or sometimes the receivers class). |
|
595 |
For supersends, its the superclass of the one, in which the |
|
596 |
caller was defined." |
|
597 |
||
598 |
searchClass notNil ifTrue:[^ searchClass]. |
|
599 |
^ receiver class |
|
600 |
! |
|
601 |
||
602 |
selector |
|
603 |
"return the selector of the method for which the context was created" |
|
604 |
||
605 |
^ selector |
|
536
dcffd1753902
be safe, when accessing a contexts sender.
Claus Gittinger <cg@exept.de>
parents:
528
diff
changeset
|
606 |
! |
dcffd1753902
be safe, when accessing a contexts sender.
Claus Gittinger <cg@exept.de>
parents:
528
diff
changeset
|
607 |
|
1 | 608 |
sender |
609 |
"return the sender of the context" |
|
610 |
||
536
dcffd1753902
be safe, when accessing a contexts sender.
Claus Gittinger <cg@exept.de>
parents:
528
diff
changeset
|
611 |
%{ /* NOCONTEXT */ |
1668
41db5950f9ea
oops - con local variables are now renamed (last change in stc)
Claus Gittinger <cg@exept.de>
parents:
1492
diff
changeset
|
612 |
OBJ theContext; |
536
dcffd1753902
be safe, when accessing a contexts sender.
Claus Gittinger <cg@exept.de>
parents:
528
diff
changeset
|
613 |
|
3508 | 614 |
theContext = __INST(sender_); |
949 | 615 |
/* |
616 |
* this special nil test is for the very first context (startup-context); |
|
617 |
* actually, its cosmetics, to avoid a visible nil>>nil context in the debugger. |
|
618 |
*/ |
|
2205 | 619 |
if (__isNonNilObject(theContext)) { |
949 | 620 |
|
1668
41db5950f9ea
oops - con local variables are now renamed (last change in stc)
Claus Gittinger <cg@exept.de>
parents:
1492
diff
changeset
|
621 |
if (__isLazy(theContext)) { |
536
dcffd1753902
be safe, when accessing a contexts sender.
Claus Gittinger <cg@exept.de>
parents:
528
diff
changeset
|
622 |
/* |
dcffd1753902
be safe, when accessing a contexts sender.
Claus Gittinger <cg@exept.de>
parents:
528
diff
changeset
|
623 |
* this cannot happen |
dcffd1753902
be safe, when accessing a contexts sender.
Claus Gittinger <cg@exept.de>
parents:
528
diff
changeset
|
624 |
*/ |
2212 | 625 |
__PATCHUPCONTEXT(theContext); |
536
dcffd1753902
be safe, when accessing a contexts sender.
Claus Gittinger <cg@exept.de>
parents:
528
diff
changeset
|
626 |
} |
3508 | 627 |
if (! __isNonLIFO(theContext)) { |
628 |
/* |
|
629 |
* to be prepared for the worst situation |
|
630 |
* (the sender is not stored, so the trap wont catch it) |
|
631 |
* make the writeBarrier trigger manually. |
|
632 |
* We'll see, if this is really required. |
|
633 |
*/ |
|
634 |
theContext->o_space |= CATCHMARK; |
|
635 |
_markNonLIFO(theContext); |
|
636 |
} |
|
536
dcffd1753902
be safe, when accessing a contexts sender.
Claus Gittinger <cg@exept.de>
parents:
528
diff
changeset
|
637 |
} |
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
638 |
RETURN (theContext); |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
639 |
%} |
1 | 640 |
! |
641 |
||
2510
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
642 |
senderIsNil |
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
643 |
"return true, if I have no sender" |
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
644 |
|
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
645 |
%{ /* NOCONTEXT */ |
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
646 |
if ( __INST(sender_) == nil ) { |
5422 | 647 |
RETURN (true); |
2510
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
648 |
} |
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
649 |
RETURN (false); |
5422 | 650 |
%}. |
651 |
^ self sender isNil |
|
2510
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
652 |
! |
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
653 |
|
623 | 654 |
setLineNumber:aNumber |
655 |
"private entry for uncompiledCodeObject ..." |
|
1 | 656 |
|
623 | 657 |
lineNr := aNumber |
340 | 658 |
! |
659 |
||
5749 | 660 |
setNumArgs:nA numVars:nV |
661 |
"set the number of arguments and variables" |
|
662 |
||
663 |
%{ /* NOCONTEXT */ |
|
664 |
int flg; |
|
665 |
||
666 |
flg = __intVal(__INST(flags)); |
|
667 |
flg = flg & ~(__NARG_MASK << __NARG_SHIFT); |
|
668 |
flg = flg & ~(__NVAR_MASK << __NVAR_SHIFT); |
|
669 |
flg = flg | __intVal(nA) << __NARG_SHIFT; |
|
670 |
flg = flg | __intVal(nV) << __NVAR_SHIFT; |
|
671 |
__INST(flags) = __MKSMALLINT(flg); |
|
672 |
%} |
|
673 |
! |
|
674 |
||
202 | 675 |
temporaries |
676 |
"return an array filled with the temporaries of this context" |
|
677 |
||
308 | 678 |
|nonTemps mySize| |
202 | 679 |
|
1810 | 680 |
nonTemps := self numArgs + self numVars. |
681 |
mySize := self numTemps. |
|
3130 | 682 |
mySize == 0 ifTrue:[ |
683 |
"/ little optimization here - avaoid creating empty containers |
|
684 |
^ #() |
|
685 |
]. |
|
308 | 686 |
^ (Array new:mySize) replaceFrom:1 to:mySize with:self startingAt:nonTemps+1 |
1810 | 687 |
|
688 |
"Modified: 23.10.1996 / 16:20:00 / cg" |
|
202 | 689 |
! |
690 |
||
10 | 691 |
varAt:n |
692 |
"return the n'th local variable" |
|
693 |
||
154 | 694 |
^ self at:(n + self numArgs) |
10 | 695 |
! |
696 |
||
697 |
varAt:n put:value |
|
698 |
"set the n'th local variable - useful when the receiver should be restarted |
|
54 | 699 |
or continued" |
10 | 700 |
|
154 | 701 |
self at:(n + self numArgs) put:value |
10 | 702 |
! |
703 |
||
623 | 704 |
vars |
705 |
"return an array filled with the local variables of this context" |
|
375 | 706 |
|
623 | 707 |
|nonVars mySize| |
360 | 708 |
|
623 | 709 |
nonVars := self numArgs. |
1810 | 710 |
mySize := self numVars. |
3130 | 711 |
mySize == 0 ifTrue:[ |
712 |
"/ little optimization here - avaoid creating empty containers |
|
713 |
^ #() |
|
714 |
]. |
|
623 | 715 |
^ (Array new:mySize) replaceFrom:1 to:mySize with:self startingAt:nonVars+1 |
1810 | 716 |
|
717 |
"Modified: 23.10.1996 / 16:20:06 / cg" |
|
1 | 718 |
! ! |
719 |
||
623 | 720 |
!Context methodsFor:'copying'! |
415 | 721 |
|
3350
40dc4807a6d4
must catch #deppCopyUsing: instead of #deepCopy.
Claus Gittinger <cg@exept.de>
parents:
3324
diff
changeset
|
722 |
deepCopyUsing:aDictionary |
623 | 723 |
"raise an error - deepCopy is not allowed for contexts" |
37 | 724 |
|
623 | 725 |
^ self deepCopyError |
3350
40dc4807a6d4
must catch #deppCopyUsing: instead of #deepCopy.
Claus Gittinger <cg@exept.de>
parents:
3324
diff
changeset
|
726 |
|
40dc4807a6d4
must catch #deppCopyUsing: instead of #deepCopy.
Claus Gittinger <cg@exept.de>
parents:
3324
diff
changeset
|
727 |
"Created: / 31.3.1998 / 15:51:14 / cg" |
1 | 728 |
! ! |
729 |
||
77 | 730 |
!Context methodsFor:'error handling'! |
731 |
||
732 |
invalidReturn:returnValue |
|
733 |
"this message is sent by the VM, when a methods context |
|
734 |
which has already returned is about to return again. |
|
735 |
(i.e. about to execute a return from an already returned |
|
105 | 736 |
method in a block). |
141 | 737 |
We raise a signal here, to allow catching of that situation." |
77 | 738 |
|
406 | 739 |
" |
740 |
in previous versions of ST/X and ST-80, this was no error; |
|
741 |
(instead, a normal blockreturn was performed to the value-sender). |
|
742 |
From a note in comp.lang.smalltalk, I conclude that new ST-80 versions |
|
743 |
now raise an error if this happens. |
|
744 |
Comment out the raise below to get that (old) behavior |
|
745 |
BETTER REWRITE YOUR APPLICATION |
|
746 |
" |
|
3258
2d96bba62ff1
use another error message if attempting to
Claus Gittinger <cg@exept.de>
parents:
3182
diff
changeset
|
747 |
"/ old behavior: |
2d96bba62ff1
use another error message if attempting to
Claus Gittinger <cg@exept.de>
parents:
3182
diff
changeset
|
748 |
"/ ^ returnValue |
2d96bba62ff1
use another error message if attempting to
Claus Gittinger <cg@exept.de>
parents:
3182
diff
changeset
|
749 |
|
282 | 750 |
"/ new behavior: |
751 |
||
3258
2d96bba62ff1
use another error message if attempting to
Claus Gittinger <cg@exept.de>
parents:
3182
diff
changeset
|
752 |
"/ 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
|
753 |
"/ use another error message. |
2d96bba62ff1
use another error message if attempting to
Claus Gittinger <cg@exept.de>
parents:
3182
diff
changeset
|
754 |
|
2d96bba62ff1
use another error message if attempting to
Claus Gittinger <cg@exept.de>
parents:
3182
diff
changeset
|
755 |
(home notNil and:[home sender notNil]) ifTrue:[ |
6002 | 756 |
^ CannotReturnError |
3258
2d96bba62ff1
use another error message if attempting to
Claus Gittinger <cg@exept.de>
parents:
3182
diff
changeset
|
757 |
raiseRequestWith:returnValue |
2d96bba62ff1
use another error message if attempting to
Claus Gittinger <cg@exept.de>
parents:
3182
diff
changeset
|
758 |
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
|
759 |
]. |
2d96bba62ff1
use another error message if attempting to
Claus Gittinger <cg@exept.de>
parents:
3182
diff
changeset
|
760 |
|
6002 | 761 |
^ CannotReturnError |
3258
2d96bba62ff1
use another error message if attempting to
Claus Gittinger <cg@exept.de>
parents:
3182
diff
changeset
|
762 |
raiseRequestWith:returnValue. |
282 | 763 |
|
3258
2d96bba62ff1
use another error message if attempting to
Claus Gittinger <cg@exept.de>
parents:
3182
diff
changeset
|
764 |
"Modified: / 2.2.1998 / 15:19:52 / cg" |
406 | 765 |
! |
766 |
||
767 |
invalidReturnOrRestart:returnValue |
|
768 |
"this message is sent by the VM, when a methods context |
|
769 |
which was compiled non-returnable is about to return again. |
|
770 |
We raise a signal here, to allow catching of that situation." |
|
771 |
||
6002 | 772 |
^ CannotReturnError |
773 |
raiseRequestWith:returnValue |
|
774 |
errorString:'method was compiled non-resumable' |
|
360 | 775 |
! |
776 |
||
777 |
invalidReturnOrRestartError:how with:value |
|
778 |
"common error reporter for restart/return errors" |
|
779 |
||
780 |
self canReturn ifTrue:[ |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
781 |
" |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
782 |
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
|
783 |
(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
|
784 |
" |
6002 | 785 |
^ CannotReturnError |
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
786 |
raiseRequestWith:value |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
787 |
errorString:(how , ' context not on calling chain') |
360 | 788 |
]. |
789 |
" |
|
790 |
tried to return from/restart a context of a method which was compiled |
|
791 |
unrestartable or of a block (which is never restartable) |
|
792 |
" |
|
6002 | 793 |
^ CannotReturnError |
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
794 |
raiseRequestWith:value |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
795 |
errorString:(how , ' context cannot be restarted/returned from') |
77 | 796 |
! ! |
797 |
||
6404 | 798 |
!Context methodsFor:'fixups'! |
799 |
||
800 |
fixAllLineNumbers |
|
801 |
%{ |
|
802 |
__PATCHUPCONTEXTS(__thisContext); |
|
6424 | 803 |
__CONTEXTLINENOS(self); |
6404 | 804 |
%} |
805 |
! ! |
|
806 |
||
623 | 807 |
!Context methodsFor:'minidebugger printing'! |
808 |
||
809 |
fullPrint |
|
810 |
"print the receiver, selector and args of the context |
|
811 |
- used only for MiniDebuggers walkback print" |
|
812 |
||
813 |
self receiverPrintString print. ' ' print. selector print. |
|
814 |
self size ~~ 0 ifTrue: [ |
|
3143 | 815 |
' ' print. self argsDisplayString print |
623 | 816 |
]. |
1426 | 817 |
' [' print. self lineNumber print. ']' printCR |
623 | 818 |
|
819 |
" |
|
820 |
thisContext fullPrint |
|
821 |
" |
|
1426 | 822 |
|
823 |
"Modified: 20.5.1996 / 10:27:14 / cg" |
|
623 | 824 |
! |
825 |
||
826 |
fullPrintAll |
|
827 |
"print a full walkback starting at the receiver |
|
828 |
- used only for MiniDebuggers walkback print" |
|
829 |
||
830 |
|context| |
|
831 |
||
832 |
context := self. |
|
833 |
[context notNil] whileTrue: [ |
|
834 |
context fullPrint. |
|
835 |
context := context sender |
|
836 |
] |
|
837 |
||
838 |
" |
|
839 |
thisContext fullPrintAll |
|
840 |
" |
|
2173 | 841 |
! |
842 |
||
4674 | 843 |
fullPrintAllLevels:nOrNil |
844 |
"print a full walkback starting at the receiver, only print n levels |
|
845 |
- used only for MiniDebuggers walkback print" |
|
846 |
||
847 |
|context count| |
|
848 |
||
849 |
count := 0. |
|
850 |
context := self. |
|
851 |
[context notNil] whileTrue: [ |
|
852 |
context fullPrint. |
|
853 |
context := context sender. |
|
5911 | 854 |
nOrNil notNil ifTrue:[ |
4674 | 855 |
(count := count+1) > nOrNil ifTrue:[^self]. |
856 |
] |
|
857 |
] |
|
858 |
||
859 |
" |
|
6648 | 860 |
thisContext fullPrintAllLevels:5 |
4674 | 861 |
" |
862 |
||
863 |
"Created: / 3.9.1999 / 14:02:38 / ps" |
|
623 | 864 |
! ! |
865 |
||
1 | 866 |
!Context methodsFor:'non local control flow'! |
867 |
||
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
868 |
evaluateUnwindActionsUpTo:aContext |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
869 |
"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
|
870 |
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
|
871 |
marked using #markForUnwind. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
872 |
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
|
873 |
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
|
874 |
|
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
875 |
|con unwindBlock| |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
876 |
|
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
877 |
" |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
878 |
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
|
879 |
" |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
880 |
con := self findNextUnwindContextOr:aContext. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
881 |
[con notNil and:[con ~~ aContext]] whileTrue:[ |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
882 |
unwindBlock := con receiver unwindHandlerInContext:con. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
883 |
con unmarkForUnwind. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
884 |
unwindBlock value. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
885 |
|
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
886 |
con := con findNextUnwindContextOr:aContext. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
887 |
]. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
888 |
^ con |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
889 |
! |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
890 |
|
1 | 891 |
restart |
892 |
"restart the receiver - i.e. the method is evaluated again. |
|
402 | 893 |
if the context to restart already died, trigger an error. |
141 | 894 |
This is a low level helper for unwindAndRestart. |
895 |
||
896 |
NOTICE: |
|
154 | 897 |
NO unwind actions are performed - this is usually not |
898 |
what you want (see Context>>unwindAndRestart). |
|
141 | 899 |
|
900 |
LIMITATION: |
|
154 | 901 |
currently a context can only be restarted by |
928 | 902 |
the owning process - not from outside. |
903 |
Also, the compiler has an option (+optcontext) to create |
|
904 |
non-restartable contexts (which are faster). |
|
905 |
If such a context is restarted, a runtime error is raised." |
|
1 | 906 |
|
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
907 |
%{ /* NOCONTEXT */ |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
908 |
if (__INST(sender_) != nil) { |
3143 | 909 |
__RESUMECONTEXT__(self, RESTART_VALUE, 0); |
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
910 |
} |
360 | 911 |
%}. |
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
912 |
self sender isNil ifTrue:[^ nil]. |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
913 |
|
69 | 914 |
" |
360 | 915 |
when we arrive here, something went wrong. |
69 | 916 |
debugging ... |
917 |
" |
|
360 | 918 |
^ self invalidReturnOrRestartError:#restart with:nil |
1 | 919 |
! |
920 |
||
623 | 921 |
resume |
922 |
"resume execution in this context. I.e. as if the method called |
|
923 |
last by the receiver did a ^ nil. |
|
924 |
If the context has already returned, report an error. |
|
925 |
||
926 |
NOTICE: |
|
927 |
NO unwind actions are performed (see Context>>unwind). |
|
928 |
||
929 |
LIMITATION: |
|
930 |
currently a context can only be resumed by |
|
928 | 931 |
the owning process - not from outside. |
932 |
Also, the compiler has an option (+optcontext) to create |
|
933 |
non-resumable contexts (which are faster). |
|
934 |
If such a context is restarted, a runtime error is raised." |
|
623 | 935 |
|
936 |
^ self resume:nil |
|
937 |
! |
|
938 |
||
939 |
resume:value |
|
940 |
"resume the receiver - as if it got 'value' from whatever |
|
941 |
it called. This continues execution in the receivers method |
|
942 |
after the point where it did its last send. |
|
943 |
If the context has already returned - report an error. |
|
944 |
||
945 |
NOTICE: |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
946 |
NO unwind actions are performed (see Context>>unwind:). |
623 | 947 |
|
948 |
LIMITATION: |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
949 |
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
|
950 |
the owning process - not from outside. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
951 |
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
|
952 |
non-resumable contexts (which are faster). |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
953 |
If such a context is restarted, a runtime error is raised." |
623 | 954 |
|
1668
41db5950f9ea
oops - con local variables are now renamed (last change in stc)
Claus Gittinger <cg@exept.de>
parents:
1492
diff
changeset
|
955 |
|theContext| |
623 | 956 |
|
957 |
" |
|
2510
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
958 |
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
|
959 |
(i.e. the one that I have called) and return from it. |
623 | 960 |
" |
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
961 |
|
2510
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
962 |
%{ |
4557 | 963 |
OBJ sndr; |
964 |
||
2510
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
965 |
theContext = __thisContext; |
4557 | 966 |
while (theContext != nil) { |
967 |
sndr = __ContextInstPtr(theContext)->c_sender; |
|
968 |
if (sndr == self) break; |
|
969 |
theContext = sndr; |
|
623 | 970 |
} |
3508 | 971 |
if (theContext != nil) { |
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
972 |
if (__isLazy(theContext)) { |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
973 |
__PATCHUPCONTEXT(theContext); |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
974 |
} |
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
975 |
} |
623 | 976 |
%}. |
977 |
||
1668
41db5950f9ea
oops - con local variables are now renamed (last change in stc)
Claus Gittinger <cg@exept.de>
parents:
1492
diff
changeset
|
978 |
theContext isNil ifTrue:[ |
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
979 |
" |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
980 |
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
|
981 |
(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
|
982 |
" |
4557 | 983 |
^ thisContext invalidReturnOrRestartError:#'resume:' with:value |
623 | 984 |
]. |
1668
41db5950f9ea
oops - con local variables are now renamed (last change in stc)
Claus Gittinger <cg@exept.de>
parents:
1492
diff
changeset
|
985 |
^ theContext return:value |
623 | 986 |
! |
987 |
||
4557 | 988 |
resumeIgnoringErrors:value |
989 |
"resume the receiver - as if it got 'value' from whatever |
|
990 |
it called. This continues execution in the receivers method |
|
991 |
after the point where it did its last send. |
|
992 |
If the context has already returned - simply return. |
|
993 |
||
994 |
NOTICE: |
|
995 |
NO unwind actions are performed (see Context>>unwind:). |
|
996 |
||
997 |
LIMITATION: |
|
998 |
currently a context can only be resumed by |
|
999 |
the owning process - not from outside. |
|
1000 |
Also, the compiler has an option (+optcontext) to create |
|
1001 |
non-resumable contexts (which are faster). |
|
1002 |
If such a context is restarted, a runtime error is raised." |
|
1003 |
||
1004 |
" |
|
1005 |
starting with this context, find the one below |
|
1006 |
(i.e. the one that I have called) and return from it. |
|
1007 |
" |
|
1008 |
||
1009 |
%{ |
|
1010 |
OBJ theContext, sndr; |
|
1011 |
||
1012 |
theContext = __thisContext; |
|
1013 |
while (theContext != nil) { |
|
1014 |
sndr = __ContextInstPtr(theContext)->c_sender; |
|
1015 |
if (sndr == self) break; |
|
1016 |
theContext = sndr; |
|
1017 |
} |
|
1018 |
if (theContext != nil) { |
|
1019 |
if (__ContextInstPtr(theContext)->c_sender) { |
|
4635 | 1020 |
if (!((INT)(__ContextInstPtr(theContext)->c_flags) & __MASKSMALLINT(__CANNOT_RETURN))) { |
1021 |
__RESUMECONTEXT__(theContext, value, 0); |
|
1022 |
} |
|
4557 | 1023 |
} |
1024 |
} |
|
1025 |
%}. |
|
1026 |
||
1027 |
"/ no error reporting |
|
1028 |
! |
|
1029 |
||
1030 |
resumeOnErrorProceed:value |
|
1031 |
"resume the receiver - as if it got 'value' from whatever |
|
1032 |
it called. This continues execution in the receivers method |
|
1033 |
after the point where it did its last send. |
|
1034 |
If the context has already returned - simply return. |
|
1035 |
||
1036 |
NOTICE: |
|
1037 |
NO unwind actions are performed (see Context>>unwind:). |
|
1038 |
||
1039 |
LIMITATION: |
|
1040 |
currently a context can only be resumed by |
|
1041 |
the owning process - not from outside. |
|
1042 |
Also, the compiler has an option (+optcontext) to create |
|
1043 |
non-resumable contexts (which are faster). |
|
1044 |
If such a context is restarted, a runtime error is raised." |
|
1045 |
||
1046 |
" |
|
1047 |
starting with this context, find the one below |
|
1048 |
(i.e. the one that I have called) and return from it. |
|
1049 |
" |
|
1050 |
||
1051 |
%{ |
|
1052 |
OBJ theContext, sndr; |
|
1053 |
||
1054 |
theContext = __thisContext; |
|
1055 |
while (theContext != nil) { |
|
1056 |
sndr = __ContextInstPtr(theContext)->c_sender; |
|
1057 |
if (sndr == self) break; |
|
1058 |
theContext = sndr; |
|
1059 |
} |
|
1060 |
if (theContext != nil) { |
|
1061 |
if (__ContextInstPtr(theContext)->c_sender) { |
|
1062 |
__RESUMECONTEXT__(theContext, value, 0); |
|
1063 |
} |
|
1064 |
} |
|
1065 |
%}. |
|
1066 |
||
1067 |
"/ no error reporting |
|
1068 |
! |
|
1069 |
||
69 | 1070 |
return |
141 | 1071 |
"return from this context with nil. I.e. as if it did a ^ nil. |
1072 |
NOTICE: |
|
154 | 1073 |
NO unwind actions are performed - this is usually not |
1074 |
what you want (See Context>>unwind). |
|
1075 |
This is a low level method - a helper for unwind. |
|
1 | 1076 |
|
141 | 1077 |
LIMITATION: |
154 | 1078 |
currently a context can only be returned by |
928 | 1079 |
the owning process - not from outside. |
1080 |
Also, the compiler has an option (+optcontext) to create |
|
1081 |
non-returnable contexts (which are faster). |
|
1082 |
If such a context is restarted, a runtime error is raised." |
|
141 | 1083 |
|
1084 |
^ self return:nil |
|
1 | 1085 |
! |
1086 |
||
69 | 1087 |
return:value |
1088 |
"return from this context as if it did a '^ value'. |
|
141 | 1089 |
NOTICE: |
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1090 |
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
|
1091 |
what you want (See Context>>unwind:). |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1092 |
This is a low level method - a helper for unwind. |
141 | 1093 |
|
1094 |
LIMITATION: |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1095 |
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
|
1096 |
the owning process - not from outside. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1097 |
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
|
1098 |
non-returnable contexts (which are faster). |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1099 |
If such a context is restarted, a runtime error is raised." |
1 | 1100 |
|
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
1101 |
%{ /* NOCONTEXT */ |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
1102 |
if (__INST(sender_) != nil) { |
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1103 |
__RESUMECONTEXT__(self, value, 0); |
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
1104 |
} |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
1105 |
%}. |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
1106 |
self sender isNil ifTrue:[^ nil]. |
1 | 1107 |
|
69 | 1108 |
" |
360 | 1109 |
when we arrive here, something went wrong. |
69 | 1110 |
debugging ... |
1111 |
" |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1112 |
^ self invalidReturnOrRestartError:#'return' with:value |
1 | 1113 |
! |
1114 |
||
328 | 1115 |
returnDoing:aBlock |
1116 |
"return from this context as if it did a '^ aBlock value'. |
|
1117 |
The block is evaluated as if called by the receiver context; |
|
1118 |
NOT the true executing context. |
|
1119 |
NOTICE: |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1120 |
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
|
1121 |
what you want (See Context>>unwindThenDo:). |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1122 |
This is a low level method - a helper for unwind. |
328 | 1123 |
|
1124 |
LIMITATION: |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1125 |
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
|
1126 |
the owning process - not from outside. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1127 |
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
|
1128 |
non-returnable contexts (which are faster). |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1129 |
If such a context is restarted, a runtime error is raised." |
328 | 1130 |
|
4557 | 1131 |
%{ |
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
1132 |
if (__INST(sender_) != nil) { |
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1133 |
__RESUMECONTEXT__(self, aBlock, 2); |
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
1134 |
} |
360 | 1135 |
%}. |
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
1136 |
self sender isNil ifTrue:[^ nil]. |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
1137 |
|
328 | 1138 |
" |
360 | 1139 |
when we arrive here, something went wrong. |
328 | 1140 |
debugging ... |
1141 |
" |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1142 |
^ self invalidReturnOrRestartError:#'returnDoing' with:aBlock |
328 | 1143 |
! |
1144 |
||
1 | 1145 |
unwind |
69 | 1146 |
"return nil from the receiver - i.e. simulate a '^ nil'. |
360 | 1147 |
If the context has already retruned, report an error. |
1 | 1148 |
Evaluate all unwind-blocks as specified in Block>>valueNowOrOnUnwind: |
69 | 1149 |
and Block>>valueOnUnwindDo: on the way. |
1 | 1150 |
|
141 | 1151 |
LIMITATION: |
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1152 |
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
|
1153 |
the owning process - not from outside. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1154 |
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
|
1155 |
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
|
1156 |
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
|
1157 |
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
|
1158 |
|
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1159 |
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
|
1160 |
non-returnable contexts (which are faster). |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1161 |
If such a context is restarted, a runtime error is raised." |
141 | 1162 |
|
1163 |
^ self unwind:nil |
|
1 | 1164 |
! |
1165 |
||
1166 |
unwind:value |
|
69 | 1167 |
"return value from the receiver - i.e. simulate a '^ value'. |
360 | 1168 |
If the context has already returned , report an error. |
1 | 1169 |
Evaluate all unwind-blocks as specified in Block>>valueNowOrOnUnwind: |
69 | 1170 |
and Block>>valueOnUnwindDo: on the way. |
141 | 1171 |
|
1172 |
LIMITATION: |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1173 |
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
|
1174 |
the owning process - not from outside. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1175 |
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
|
1176 |
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
|
1177 |
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
|
1178 |
context, by giving it an interrupt action - this does make sense. |
1 | 1179 |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1180 |
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
|
1181 |
non-returnable contexts (which are faster). |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1182 |
If such a context is restarted, a runtime error is raised." |
1 | 1183 |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1184 |
|con| |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1185 |
|
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1186 |
self senderIsNil ifFalse:[ |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1187 |
con := thisContext evaluateUnwindActionsUpTo:self. |
141 | 1188 |
]. |
1 | 1189 |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1190 |
"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
|
1191 |
(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
|
1192 |
should we check for this situation first and NOT evaluate |
141 | 1193 |
the unwind actions in this case ?) |
1194 |
" |
|
69 | 1195 |
con isNil ifTrue:[ |
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1196 |
" |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1197 |
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
|
1198 |
(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
|
1199 |
" |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1200 |
^ self invalidReturnOrRestartError:#'unwind:' with:value |
69 | 1201 |
]. |
141 | 1202 |
" |
1203 |
now, that all unwind-actions are done, I can use the |
|
1204 |
low-level return ... |
|
1205 |
" |
|
1206 |
^ self return:value |
|
1207 |
! |
|
1208 |
||
1209 |
unwindAndRestart |
|
1210 |
"restart the receiver - i.e. the method is evaluated again. |
|
402 | 1211 |
if the context to restart already died report an error. |
141 | 1212 |
Evaluate all unwind-blocks as specified in Block>>valueNowOrOnUnwind: |
1213 |
and Block>>valueOnUnwindDo: before restarting. |
|
1214 |
||
1215 |
LIMITATION: |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1216 |
a context can only be restarted by |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1217 |
the owning process - not from outside. |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1218 |
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
|
1219 |
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
|
1220 |
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
|
1221 |
context, by giving it an interrupt action - this does make sense. |
141 | 1222 |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1223 |
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
|
1224 |
non-restartable contexts (which are faster). |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1225 |
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
|
1226 |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1227 |
|con| |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1228 |
|
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1229 |
self senderIsNil ifFalse:[ |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1230 |
con := thisContext evaluateUnwindActionsUpTo:self. |
141 | 1231 |
]. |
1232 |
||
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1233 |
"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
|
1234 |
(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
|
1235 |
should we check for this situation first and NOT evaluate |
141 | 1236 |
the unwind actions in this case ?) |
1237 |
" |
|
1238 |
con isNil ifTrue:[ |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1239 |
" |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1240 |
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
|
1241 |
(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
|
1242 |
" |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1243 |
^ self invalidReturnOrRestartError:#'unwindAndRestart:' with:nil |
141 | 1244 |
]. |
1245 |
" |
|
1246 |
now, that all unwind-actions are done, I can use the |
|
1247 |
low-level restart ... |
|
1248 |
" |
|
1249 |
^ self restart |
|
328 | 1250 |
! |
1251 |
||
4485 | 1252 |
unwindAndResume:value |
1253 |
"resume execution in the the receiver - i.e. simulate a '^ value' |
|
1254 |
from whatever it called last. |
|
1255 |
If the context has already returned , report an error. |
|
1256 |
Evaluate all unwind-blocks as specified in Block>>valueNowOrOnUnwind: |
|
1257 |
and Block>>valueOnUnwindDo: on the way. |
|
1258 |
||
1259 |
LIMITATION: |
|
1260 |
currently a context can only be unwound by |
|
1261 |
the owning process - not from outside. |
|
1262 |
i.e. it is not possible for one thread to unwind |
|
1263 |
another threads context - which does not make sense anyway. |
|
1264 |
However, you can force another thread to do this in its own process |
|
1265 |
context, by giving it an interrupt action - this does make sense. |
|
1266 |
||
1267 |
Also, the compiler has an option (+optcontext) to create |
|
1268 |
non-returnable contexts (which are faster). |
|
1269 |
If such a context is restarted, a runtime error is raised." |
|
1270 |
||
1271 |
|con| |
|
1272 |
||
1273 |
self senderIsNil ifFalse:[ |
|
1274 |
con := thisContext evaluateUnwindActionsUpTo:self. |
|
1275 |
]. |
|
1276 |
||
1277 |
"oops, if nil, I am not on the calling chain; |
|
1278 |
(bad bad, unwind action have already been performed. |
|
1279 |
should we check for this situation first and NOT evaluate |
|
1280 |
the unwind actions in this case ?) |
|
1281 |
" |
|
1282 |
con isNil ifTrue:[ |
|
1283 |
" |
|
1284 |
tried to return to a context which is already dead |
|
1285 |
(i.e. the method/block has already executed a return) |
|
1286 |
" |
|
1287 |
^ self invalidReturnOrRestartError:#'unwindAndResume:' with:value |
|
1288 |
]. |
|
1289 |
" |
|
1290 |
now, that all unwind-actions are done, I can use the |
|
1291 |
low-level resume ... |
|
1292 |
" |
|
1293 |
^ self resume:value |
|
1294 |
! |
|
1295 |
||
328 | 1296 |
unwindThenDo:aBlock |
1297 |
"return the value of aBlock from the receiver - i.e. simulate a '^ aBlock value'. |
|
360 | 1298 |
If the context has already returned , report an error. |
328 | 1299 |
Evaluate all unwind-blocks as specified in Block>>valueNowOrOnUnwind: |
1300 |
and Block>>valueOnUnwindDo: on the way. |
|
1301 |
The block is evaluated AFTER all unwind actions are performed |
|
1302 |
(i.e. the blocks sender will be the receiving context, not the |
|
402 | 1303 |
currently executing context) |
328 | 1304 |
|
1305 |
LIMITATION: |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1306 |
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
|
1307 |
the owning process - not from outside |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1308 |
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
|
1309 |
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
|
1310 |
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
|
1311 |
context, by giving it an interrupt action - this does make sense. |
328 | 1312 |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1313 |
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
|
1314 |
non-returnable contexts (which are faster). |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1315 |
If such a context is restarted, a runtime error is raised." |
328 | 1316 |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1317 |
|con| |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1318 |
|
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1319 |
self senderIsNil ifFalse:[ |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1320 |
con := thisContext evaluateUnwindActionsUpTo:self. |
328 | 1321 |
]. |
1322 |
||
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1323 |
"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
|
1324 |
(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
|
1325 |
should we check for this situation first and NOT evaluate |
328 | 1326 |
the unwind actions in this case ?) |
1327 |
" |
|
1328 |
con isNil ifTrue:[ |
|
4477
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1329 |
" |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1330 |
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
|
1331 |
(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
|
1332 |
" |
ef99343d6756
better #unwind - ask receiver for handler block
Claus Gittinger <cg@exept.de>
parents:
4464
diff
changeset
|
1333 |
^ self invalidReturnOrRestartError:#'unwindThenDo:' with:aBlock |
328 | 1334 |
]. |
1335 |
" |
|
1336 |
now, that all unwind-actions are done, I can use the |
|
1337 |
low-level return ... |
|
1338 |
" |
|
1339 |
^ self returnDoing:aBlock |
|
1 | 1340 |
! ! |
623 | 1341 |
|
1342 |
!Context methodsFor:'printing & storing'! |
|
1343 |
||
1070
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1344 |
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
|
1345 |
|
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1346 |
|name| |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1347 |
%{ |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1348 |
/* |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1349 |
* 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
|
1350 |
* 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
|
1351 |
* 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
|
1352 |
*/ |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1353 |
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
|
1354 |
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
|
1355 |
} |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1356 |
%}. |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1357 |
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
|
1358 |
^ 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
|
1359 |
! |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1360 |
|
623 | 1361 |
argsDisplayString |
1362 |
|fullString n "{ Class: SmallInteger }" | |
|
1363 |
||
1364 |
fullString := ''. |
|
1365 |
n := self numArgs. |
|
1366 |
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
|
1367 |
fullString := fullString , ' ' , (self argStringFor:(self at:index)) |
623 | 1368 |
]. |
1369 |
^ fullString |
|
1370 |
! |
|
1371 |
||
6648 | 1372 |
displayArgsOn:aStream |
1373 |
| n "{ Class: SmallInteger }" | |
|
1374 |
||
1375 |
n := self numArgs. |
|
1376 |
1 to:n do:[:index | |
|
1377 |
aStream nextPutAll:(self argStringFor:(self at:index)). |
|
1378 |
aStream space. |
|
1379 |
]. |
|
1380 |
! |
|
1381 |
||
623 | 1382 |
displayString |
1383 |
"return a string describing the context - for display in Inspector" |
|
1384 |
||
1385 |
^ self class name , '(' , self printString , ')' |
|
1386 |
! |
|
1387 |
||
6648 | 1388 |
fullPrintAllOn:aStream |
1389 |
"print a full walkback starting at the receiver" |
|
1390 |
||
1391 |
|context| |
|
1392 |
||
1393 |
context := self. |
|
1394 |
[context notNil] whileTrue: [ |
|
1395 |
context fullPrintOn:aStream. |
|
1396 |
aStream cr. |
|
1397 |
context := context sender |
|
1398 |
] |
|
1399 |
||
1400 |
" |
|
1401 |
thisContext fullPrintAllOn:Transcript |
|
1402 |
" |
|
1403 |
||
1404 |
"Created: 15.1.1997 / 18:09:05 / cg" |
|
1405 |
! |
|
1406 |
||
1407 |
fullPrintOn:aStream |
|
1408 |
"print the receiver, selector and args of the context" |
|
1409 |
||
1410 |
self receiverPrintString printOn:aStream. aStream space. selector printOn:aStream. |
|
1411 |
self size ~~ 0 ifTrue: [ |
|
1412 |
aStream space. |
|
1413 |
self displayArgsOn:aStream |
|
1414 |
]. |
|
1415 |
aStream nextPutAll:' ['. |
|
1416 |
self lineNumber printOn:aStream. |
|
1417 |
aStream nextPut:$]. |
|
1418 |
||
1419 |
" |
|
1420 |
thisContext fullPrintOn:Transcript |
|
1421 |
" |
|
1422 |
||
1423 |
"Modified: 20.5.1996 / 10:27:14 / cg" |
|
1424 |
"Created: 15.1.1997 / 18:09:06 / cg" |
|
1425 |
! |
|
1426 |
||
623 | 1427 |
fullPrintString |
1428 |
"return a string describing the context - this includes the linenumber, |
|
1429 |
receiver printString and argument printString" |
|
1430 |
||
1431 |
|s| |
|
1432 |
||
1433 |
s := WriteStream on:String new. |
|
6648 | 1434 |
self fullPrintOn:s. |
623 | 1435 |
^ s contents |
1436 |
||
1437 |
" |
|
1438 |
thisContext fullPrintString |
|
1439 |
" |
|
1440 |
! |
|
1441 |
||
1442 |
methodPrintString |
|
1443 |
"return a string describing the contexts method as 'implementorClass>>selector'" |
|
1444 |
||
1853
09cd1e8df9a2
use new Method>>who interface
Claus Gittinger <cg@exept.de>
parents:
1810
diff
changeset
|
1445 |
|mthd who| |
623 | 1446 |
|
1447 |
mthd := self method. |
|
1448 |
mthd notNil ifTrue:[ |
|
3143 | 1449 |
who := mthd who. |
1450 |
who notNil ifTrue:[ |
|
1451 |
^ who methodClass name , '>>' , who methodSelector |
|
1452 |
] |
|
623 | 1453 |
]. |
1454 |
^ mthd displayString. |
|
1455 |
||
1456 |
" |
|
1457 |
thisContext methodPrintString |
|
1458 |
thisContext sender methodPrintString |
|
1459 |
" |
|
1853
09cd1e8df9a2
use new Method>>who interface
Claus Gittinger <cg@exept.de>
parents:
1810
diff
changeset
|
1460 |
|
09cd1e8df9a2
use new Method>>who interface
Claus Gittinger <cg@exept.de>
parents:
1810
diff
changeset
|
1461 |
"Modified: 1.11.1996 / 16:21:49 / cg" |
623 | 1462 |
! |
1463 |
||
1464 |
printOn:aStream |
|
1465 |
"append a printed description of the receiver onto aStream" |
|
1466 |
||
1467 |
aStream nextPutAll:(self receiverPrintString). |
|
1468 |
aStream space. |
|
4393 | 1469 |
self selector printOn:aStream. |
1470 |
aStream space. |
|
1471 |
aStream nextPutAll:' ['; nextPutAll:self lineNumber printString; nextPutAll:']' . |
|
1472 |
||
623 | 1473 |
! |
1474 |
||
1475 |
receiverPrintString |
|
1476 |
"return a string describing the receiver of the context" |
|
1477 |
||
1478 |
|receiverClass receiverClassName newString implementorClass| |
|
1479 |
||
1070
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1480 |
%{ |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1481 |
/* |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1482 |
* 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
|
1483 |
* 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
|
1484 |
* 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
|
1485 |
*/ |
1133 | 1486 |
if (__isNonNilObject(__INST(receiver)) && (__qClass(__INST(receiver))==nil)) { |
3923 | 1487 |
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
|
1488 |
} |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1489 |
%}. |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1490 |
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
|
1491 |
|
623 | 1492 |
receiverClass := receiver class. |
3923 | 1493 |
receiverClass isJavaClass ifTrue:[ |
1494 |
receiverClassName := receiverClass displayString |
|
1495 |
] ifFalse:[ |
|
1496 |
(receiverClass isBehavior |
|
1497 |
and:[receiverClass isMeta |
|
1498 |
and:[receiverClass soleInstance isJavaClass]]) ifTrue:[ |
|
1499 |
"/ receiverClassName := receiverClass soleInstance fullName. |
|
1500 |
receiverClassName := receiverClass name. |
|
1501 |
] ifFalse:[ |
|
1502 |
receiverClassName := receiverClass name. |
|
1503 |
] |
|
1504 |
]. |
|
6197 | 1505 |
(receiverClass == SmallInteger |
1506 |
or:[receiverClass == Float]) ifTrue:[ |
|
3923 | 1507 |
newString := '(' , receiver printString , ') ' , receiverClassName |
623 | 1508 |
] ifFalse:[ |
3923 | 1509 |
newString := receiverClassName |
623 | 1510 |
]. |
1511 |
||
1512 |
selector notNil ifTrue:[ |
|
1513 |
"/ implementorClass := self searchClass whichClassIncludesSelector:selector. |
|
1514 |
||
3923 | 1515 |
" |
1516 |
kludge to avoid slow search for containing class |
|
1517 |
" |
|
1518 |
(selector ~~ #doIt and:[selector ~~ #doIt:]) ifTrue:[ |
|
1519 |
implementorClass := self methodClass. |
|
1520 |
]. |
|
1521 |
||
1522 |
implementorClass notNil ifTrue: [ |
|
1523 |
(implementorClass ~~ receiverClass) ifTrue: [ |
|
1524 |
newString := newString , '>>>', |
|
1525 |
implementorClass name printString |
|
1526 |
] |
|
1527 |
] ifFalse:[ |
|
1528 |
self searchClass ~~ receiverClass ifTrue:[ |
|
1529 |
newString := newString , '>>>' , self searchClass name |
|
1530 |
]. |
|
1531 |
" |
|
1532 |
kludge for doIt - these unbound methods are not |
|
1533 |
found in the classes methodDictionary |
|
1534 |
" |
|
1535 |
(selector ~~ #doIt and:[selector ~~ #doIt:]) ifTrue:[ |
|
1536 |
newString := newString , '>>>**NONE**' |
|
1537 |
] |
|
1538 |
] |
|
623 | 1539 |
]. |
1540 |
||
1541 |
^ newString |
|
6197 | 1542 |
|
1543 |
"Modified: / 16.11.2001 / 16:04:21 / cg" |
|
623 | 1544 |
! ! |
1545 |
||
7257 | 1546 |
!Context methodsFor:'private-accessing'! |
623 | 1547 |
|
4464
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1548 |
markForHandle |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1549 |
"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
|
1550 |
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
|
1551 |
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
|
1552 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1553 |
%{ /* NOCONTEXT */ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1554 |
__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
|
1555 |
%} |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1556 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1557 |
"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
|
1558 |
! |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1559 |
|
753
81d54fc53a18
added mechanism to force a stepInterrupt whenever a context returns or unwinds
Claus Gittinger <cg@exept.de>
parents:
749
diff
changeset
|
1560 |
markForInterrupt |
81d54fc53a18
added mechanism to force a stepInterrupt whenever a context returns or unwinds
Claus Gittinger <cg@exept.de>
parents:
749
diff
changeset
|
1561 |
"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
|
1562 |
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
|
1563 |
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
|
1564 |
|
81d54fc53a18
added mechanism to force a stepInterrupt whenever a context returns or unwinds
Claus Gittinger <cg@exept.de>
parents:
749
diff
changeset
|
1565 |
%{ /* NOCONTEXT */ |
81d54fc53a18
added mechanism to force a stepInterrupt whenever a context returns or unwinds
Claus Gittinger <cg@exept.de>
parents:
749
diff
changeset
|
1566 |
__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
|
1567 |
%} |
81d54fc53a18
added mechanism to force a stepInterrupt whenever a context returns or unwinds
Claus Gittinger <cg@exept.de>
parents:
749
diff
changeset
|
1568 |
! |
81d54fc53a18
added mechanism to force a stepInterrupt whenever a context returns or unwinds
Claus Gittinger <cg@exept.de>
parents:
749
diff
changeset
|
1569 |
|
1727 | 1570 |
markForInterruptOnUnwind |
1571 |
"set the interrupt-on-unwind flag in the receiver. |
|
1572 |
The VM will generate a stepInterrupt, when this context returns or |
|
1573 |
is unwound. This is used by the debugger for faster single-stepping; |
|
1574 |
- a highly internal mechanism and not for public use." |
|
1575 |
||
1576 |
%{ /* NOCONTEXT */ |
|
3508 | 1577 |
__INST(flags) = (OBJ)((INT)__INST(flags) | __MASKSMALLINT(__IRQ_ON_UNWIND)); |
1727 | 1578 |
%} |
1579 |
! |
|
1580 |
||
4464
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1581 |
markForRaise |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1582 |
"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
|
1583 |
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
|
1584 |
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
|
1585 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1586 |
%{ /* NOCONTEXT */ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1587 |
__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
|
1588 |
%} |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1589 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1590 |
"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
|
1591 |
! |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1592 |
|
623 | 1593 |
markForUnwind |
749 | 1594 |
"set the mark for unwind flag in the receiver. |
1595 |
The VM needs this to know that some special action is to be performed with |
|
1596 |
this context - a highly internal mechanism and not for public use." |
|
1597 |
||
623 | 1598 |
%{ /* NOCONTEXT */ |
1133 | 1599 |
__INST(flags) = (OBJ)((INT)__INST(flags) | __MASKSMALLINT(__UNWIND_MARK)); |
623 | 1600 |
%} |
749 | 1601 |
|
1602 |
"Modified: 13.12.1995 / 19:05:22 / cg" |
|
623 | 1603 |
! |
1604 |
||
5780 | 1605 |
setHome:aContext |
1606 |
"set the homeContext. |
|
1607 |
DANGER: this is for experimental, internal use only (byteCode interpreters)" |
|
1608 |
||
1609 |
home := aContext. |
|
1610 |
! |
|
1611 |
||
1612 |
setSender:aContext |
|
1613 |
"set the sender of the context. |
|
1614 |
DANGER: this is for experimental, internal use only (byteCode interpreters)" |
|
1615 |
||
1616 |
%{ /* NOCONTEXT */ |
|
1617 |
__INST(sender_) = aContext; |
|
1618 |
%} |
|
1619 |
! |
|
1620 |
||
623 | 1621 |
unmarkForUnwind |
749 | 1622 |
"clear the mark for unwind flag in the receiver. |
1623 |
The VM needs this to know that some special action is to be performed with |
|
1624 |
this context - a highly internal mechanism and not for public use." |
|
1625 |
||
623 | 1626 |
%{ /* NOCONTEXT */ |
1133 | 1627 |
__INST(flags) = (OBJ)((INT)__INST(flags) & ~__MASKSMALLINT(__UNWIND_MARK)); |
623 | 1628 |
%} |
1629 |
! ! |
|
1630 |
||
4464
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1631 |
!Context methodsFor:'searching'! |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1632 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1633 |
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
|
1634 |
"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
|
1635 |
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
|
1636 |
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
|
1637 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1638 |
"/ 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
|
1639 |
"/ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1640 |
"/ |con| |
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 |
"/ con := self sender. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1643 |
"/ [con notNil] whileTrue:[ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1644 |
"/ 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
|
1645 |
"/ con := con sender. |
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 |
"/ ^ nil |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1648 |
"/ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1649 |
"/ 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
|
1650 |
"/ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1651 |
"/ (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
|
1652 |
"/ 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
|
1653 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1654 |
%{ /* NOCONTEXT */ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1655 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1656 |
OBJ theContext; |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1657 |
OBJ sel; |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1658 |
OBJ __FETCHSELECTOR(); |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1659 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1660 |
theContext = __INST(sender_); |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1661 |
while (__isNonNilObject(theContext)) { |
5422 | 1662 |
if (__isLazy(theContext)) { |
4464
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1663 |
#ifdef TRADITIONAL_STACK_FRAME |
5422 | 1664 |
sel = __FETCHSELECTOR(theContext); |
4464
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1665 |
#else |
5422 | 1666 |
/* mhmh - not really needed */ |
1667 |
__PATCHUPCONTEXT(theContext); |
|
1668 |
sel = __ContextInstPtr(theContext)->c_selector; |
|
4464
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1669 |
#endif |
5422 | 1670 |
} else { |
1671 |
sel = __ContextInstPtr(theContext)->c_selector; |
|
1672 |
} |
|
1673 |
||
1674 |
if ((sel == selector1) |
|
1675 |
|| ((selector2 != nil) && (sel == selector2)) |
|
1676 |
|| ((selector3 != nil) && (sel == selector3))) { |
|
1677 |
if (__isLazy(theContext)) { |
|
1678 |
__PATCHUPCONTEXT(theContext); |
|
1679 |
} |
|
4464
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1680 |
|
5422 | 1681 |
if (! __isNonLIFO(theContext)) { |
1682 |
/* |
|
1683 |
* to be prepared for the worst situation |
|
1684 |
* (the sender is not stored, so the trap wont catch it) |
|
1685 |
* make the writeBarrier trigger manually. |
|
1686 |
* We'll see, if this is really required. |
|
1687 |
*/ |
|
1688 |
theContext->o_space |= CATCHMARK; |
|
1689 |
_markNonLIFO(theContext); |
|
1690 |
} |
|
1691 |
RETURN (theContext); |
|
1692 |
} |
|
1693 |
theContext = __ContextInstPtr(theContext)->c_sender; |
|
1694 |
} |
|
1695 |
RETURN (nil); |
|
1696 |
%}. |
|
1697 |
" |
|
1698 |
|con sel| |
|
4464
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1699 |
|
5422 | 1700 |
con := self sender. |
1701 |
[con notNil] whileTrue:[ |
|
1702 |
sel := con selector. |
|
1703 |
sel == selector1 ifTrue:[^ con]. |
|
1704 |
(selector2 notNil and:[sel == selector2]) ifTrue:[^ con]. |
|
1705 |
(selector3 notNil and:[sel == selector3]) ifTrue:[^ con]. |
|
1706 |
con := con sender. |
|
1707 |
]. |
|
1708 |
^ nil |
|
1709 |
" |
|
4464
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1710 |
! |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1711 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1712 |
findNextUnwindContextOr:aContext |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1713 |
"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
|
1714 |
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
|
1715 |
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
|
1716 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1717 |
"/ 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
|
1718 |
"/ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1719 |
"/ |con| |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1720 |
"/ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1721 |
"/ con := self sender. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1722 |
"/ [con notNil |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1723 |
"/ and:[con ~~ aContext |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1724 |
"/ 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
|
1725 |
"/ ^ con |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1726 |
"/ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1727 |
"/ 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
|
1728 |
"/ (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
|
1729 |
"/ 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
|
1730 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1731 |
%{ /* NOCONTEXT */ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1732 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1733 |
OBJ theContext; |
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 |
if (self == aContext) { |
4485 | 1736 |
RETURN (self); |
4464
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1737 |
} |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1738 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1739 |
theContext = __INST(sender_); |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1740 |
while (__isNonNilObject(theContext)) { |
4485 | 1741 |
if ((theContext == aContext) |
1742 |
|| ((INT)(__ContextInstPtr(theContext)->c_flags) & __MASKSMALLINT(__UNWIND_MARK))) { |
|
1743 |
if (__isLazy(theContext)) { |
|
1744 |
__PATCHUPCONTEXT(theContext); |
|
1745 |
} |
|
1746 |
if (! __isNonLIFO(theContext)) { |
|
1747 |
/* |
|
1748 |
* to be prepared for the worst situation |
|
1749 |
* (the sender is not stored, so the trap wont catch it) |
|
1750 |
* make the writeBarrier trigger manually. |
|
1751 |
* We'll see, if this is really required. |
|
1752 |
*/ |
|
1753 |
theContext->o_space |= CATCHMARK; |
|
1754 |
#if 0 |
|
1755 |
_markNonLIFO(theContext); |
|
1756 |
#endif |
|
1757 |
} |
|
1758 |
RETURN (theContext); |
|
1759 |
} |
|
1760 |
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
|
1761 |
} |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1762 |
%}. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1763 |
^ nil |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1764 |
! |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1765 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1766 |
findSpecialHandle:findHandleContext raise:findRaiseContext |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1767 |
"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
|
1768 |
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
|
1769 |
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
|
1770 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1771 |
"/ 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
|
1772 |
"/ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1773 |
"/ |con| |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1774 |
"/ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1775 |
"/ con := self sender. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1776 |
"/ [con notNil] whileTrue:[ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1777 |
"/ (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
|
1778 |
"/ (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
|
1779 |
"/ con := con sender. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1780 |
"/ ]. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1781 |
"/ ^ nil |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1782 |
"/ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1783 |
"/ 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
|
1784 |
"/ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1785 |
"/ (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
|
1786 |
"/ 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
|
1787 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1788 |
%{ /* NOCONTEXT */ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1789 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1790 |
OBJ theContext; |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1791 |
OBJ sel; |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1792 |
OBJ __FETCHSELECTOR(); |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1793 |
int flagMask = 0; |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1794 |
INT mask; |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1795 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1796 |
if (findHandleContext == true) |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1797 |
flagMask = __HANDLE_MARK; |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1798 |
if (findRaiseContext == true) |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1799 |
flagMask |= __RAISE_MARK; |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1800 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1801 |
mask = __MASKSMALLINT(flagMask); |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1802 |
theContext = __INST(sender_); |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1803 |
while (__isNonNilObject(theContext)) { |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1804 |
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
|
1805 |
if (__isLazy(theContext)) { |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1806 |
__PATCHUPCONTEXT(theContext); |
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 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1809 |
if (! __isNonLIFO(theContext)) { |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1810 |
/* |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1811 |
* 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
|
1812 |
* (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
|
1813 |
* 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
|
1814 |
* 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
|
1815 |
*/ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1816 |
theContext->o_space |= CATCHMARK; |
4485 | 1817 |
#if 0 |
4464
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1818 |
_markNonLIFO(theContext); |
4485 | 1819 |
#endif |
4464
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1820 |
} |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1821 |
RETURN (theContext); |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1822 |
} |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1823 |
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
|
1824 |
} |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1825 |
%}. |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1826 |
^ nil |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1827 |
! ! |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1828 |
|
1051 | 1829 |
!Context methodsFor:'special accessing'! |
1830 |
||
4557 | 1831 |
canResume |
1832 |
"return true, if the receiver allows to be resumed. |
|
1833 |
Due to the implementation, this requires that the context which |
|
1834 |
is right below the receiver is returnable." |
|
1835 |
||
1836 |
|theContext| |
|
1837 |
||
1838 |
" |
|
1839 |
starting with this context, find the one below |
|
1840 |
(i.e. the one that I have called) and return from it. |
|
1841 |
" |
|
1842 |
%{ |
|
1843 |
OBJ sndr; |
|
1844 |
||
1845 |
theContext = __thisContext; |
|
1846 |
while (theContext != nil) { |
|
1847 |
sndr = __ContextInstPtr(theContext)->c_sender; |
|
1848 |
if (sndr == self) break; |
|
1849 |
theContext = sndr; |
|
1850 |
} |
|
1851 |
if (theContext != nil) { |
|
1852 |
if (__isLazy(theContext)) { |
|
1853 |
__PATCHUPCONTEXT(theContext); |
|
1854 |
} |
|
1855 |
} |
|
1856 |
%}. |
|
1857 |
theContext isNil ifTrue:[ |
|
1858 |
^ false |
|
1859 |
]. |
|
1860 |
^ theContext canReturn |
|
1861 |
! |
|
1862 |
||
1051 | 1863 |
canReturn |
1864 |
"return true, if the receiver allows returning through it. |
|
4557 | 1865 |
Blocks, (currently) always return false. |
2646 | 1866 |
Methods which contain a (non-inlined) block are always |
1867 |
returnable - for other methods, it depends on how the system |
|
1868 |
was compiled (stc flag +/-optContext). |
|
1869 |
If it was compiled with +optContext, methods are compiled |
|
4557 | 1870 |
non returnable, unless a return-pragma was present in the method. |
2646 | 1871 |
Since this saves some administrative work in every method |
1872 |
invocation and makes overall execution faster, the system classes |
|
1873 |
are all compiled with this flag turned on." |
|
1051 | 1874 |
|
1875 |
%{ /* NOCONTEXT */ |
|
1876 |
||
3508 | 1877 |
RETURN ( ((INT)(__INST(flags)) & __MASKSMALLINT(__CANNOT_RETURN)) ? false : true ); |
5441 | 1878 |
%}. |
1879 |
^ true |
|
1051 | 1880 |
! |
1881 |
||
1492 | 1882 |
hasStackToShow |
2646 | 1883 |
"private interface to the debugger. |
1884 |
Smalltalk contexts return false here - other language frames |
|
1885 |
(i.e. Java frames) may want to show the evaluation stack" |
|
1886 |
||
1492 | 1887 |
^ false |
1888 |
||
1889 |
"Created: 28.6.1996 / 14:48:39 / cg" |
|
2646 | 1890 |
"Modified: 13.5.1997 / 16:31:12 / cg" |
1492 | 1891 |
! |
1892 |
||
4464
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1893 |
isHandleContext |
4505 | 1894 |
"return true, if this is a context with exception-handle flag set" |
4464
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Stefan Vogel <sv@exept.de>
parents:
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changeset
|
1895 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
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parents:
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diff
changeset
|
1896 |
%{ /* NOCONTEXT */ |
cec93c942c14
Use context flag for exception handling instead of searching for
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parents:
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diff
changeset
|
1897 |
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:
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diff
changeset
|
1898 |
%} |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
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diff
changeset
|
1899 |
! |
cec93c942c14
Use context flag for exception handling instead of searching for
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parents:
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diff
changeset
|
1900 |
|
1051 | 1901 |
isNonLifo |
2646 | 1902 |
"return true, if this is a nonLifo context. |
1903 |
A nonLifo context is one that is still on the machine stack, |
|
1904 |
but has a reference taken and needs to be converted to a real |
|
1905 |
object (in objectMemory) when the method/block returns. |
|
1906 |
You dont have to understand this - this is a special ST/X |
|
1907 |
debug query, which may be removed without notice." |
|
1051 | 1908 |
|
1909 |
%{ /* NOCONTEXT */ |
|
1133 | 1910 |
RETURN ( ((INT)__INST(flags) & __MASKSMALLINT(__NONLIFO)) ? true : false ); |
1051 | 1911 |
%} |
1912 |
! |
|
1913 |
||
1914 |
isOnMachineStack |
|
1915 |
"return true, if this is a machine stack context as opposed to a |
|
2646 | 1916 |
real heap context. |
1917 |
You dont have to understand this - this is a special ST/X |
|
1918 |
debug query, which may be removed without notice." |
|
1051 | 1919 |
|
1920 |
%{ /* NOCONTEXT */ |
|
1921 |
RETURN ( (__qSpace(self) >= STACKSPACE) ? true : false ); |
|
1922 |
%} |
|
1923 |
! |
|
1924 |
||
4464
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1925 |
isRaiseContext |
4505 | 1926 |
"return true, if this is a context with exception-raise flag set" |
4464
cec93c942c14
Use context flag for exception handling instead of searching for
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parents:
4450
diff
changeset
|
1927 |
|
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
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diff
changeset
|
1928 |
%{ /* NOCONTEXT */ |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
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diff
changeset
|
1929 |
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:
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diff
changeset
|
1930 |
%} |
cec93c942c14
Use context flag for exception handling instead of searching for
Stefan Vogel <sv@exept.de>
parents:
4450
diff
changeset
|
1931 |
! |
cec93c942c14
Use context flag for exception handling instead of searching for
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parents:
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diff
changeset
|
1932 |
|
1051 | 1933 |
isSpecial |
1934 |
"return true, if this is either a nonLifo or interrupted context" |
|
1935 |
||
1936 |
%{ /* NOCONTEXT */ |
|
1133 | 1937 |
RETURN ( ((INT)__INST(flags) & __MASKSMALLINT(__SPECIAL)) ? true : false ); |
1051 | 1938 |
%} |
1939 |
! |
|
1940 |
||
1941 |
isUnwindContext |
|
1942 |
"return true, if this is an unwindContext" |
|
1943 |
||
1944 |
%{ /* NOCONTEXT */ |
|
1133 | 1945 |
RETURN ( ((INT)__INST(flags) & __MASKSMALLINT(__UNWIND_MARK)) ? true : false ); |
1051 | 1946 |
%} |
1947 |
! ! |
|
1948 |
||
623 | 1949 |
!Context methodsFor:'testing'! |
1950 |
||
1951 |
isBlockContext |
|
1952 |
"return true, iff the receiver is a BlockContext, false otherwise" |
|
1953 |
||
1954 |
^ false |
|
1955 |
! |
|
1956 |
||
1957 |
isContext |
|
1958 |
"return true, iff the receiver is a Context, false otherwise" |
|
1959 |
||
1960 |
^ true |
|
1961 |
! |
|
1962 |
||
1963 |
isRecursive |
|
1964 |
"return true, if this context is one of a recursive send of the same |
|
1483 | 1965 |
selector to the same receiver before. |
1966 |
Here, different arguments are ignored - i.e. only the same method |
|
1967 |
counts for recursiveness. |
|
623 | 1968 |
Used to detect recursive errors or recursive printing - for example." |
1969 |
||
2291
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1970 |
|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
|
1971 |
|
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1972 |
count := 0. |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1973 |
|
2893 | 1974 |
c := self findNextContextWithSelector:selector or:nil or:nil. |
623 | 1975 |
[c notNil] whileTrue:[ |
3143 | 1976 |
(c receiver == receiver) ifTrue:[ |
1977 |
" |
|
1978 |
stupid: the current ST/X context does not include |
|
1979 |
the method, but the class, in which the search started ... |
|
1980 |
" |
|
2291
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1981 |
myMethodsClass isNil ifTrue:[ |
3143 | 1982 |
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
|
1983 |
]. |
3143 | 1984 |
c methodClass == myMethodsClass ifTrue:[ |
1985 |
^ true |
|
1986 |
] |
|
1987 |
]. |
|
1988 |
c := c findNextContextWithSelector:selector or:nil or:nil. |
|
2135
6bd144c1c358
newStyle info & error messages
Claus Gittinger <cg@exept.de>
parents:
1853
diff
changeset
|
1989 |
|
3143 | 1990 |
" |
1991 |
this special test was added to get out after a while |
|
1992 |
if the sender chain is corrupt - this gives us at least |
|
1993 |
a chance to find those errors. |
|
1994 |
" |
|
1995 |
count := count + 1. |
|
1996 |
count >= 100000 ifTrue:[ |
|
1997 |
'Context [warning]: bad context chain' errorPrintCR. |
|
1998 |
^ true |
|
1999 |
] |
|
623 | 2000 |
]. |
2001 |
^ false |
|
1483 | 2002 |
|
2135
6bd144c1c358
newStyle info & error messages
Claus Gittinger <cg@exept.de>
parents:
1853
diff
changeset
|
2003 |
"Modified: 10.1.1997 / 17:34:26 / cg" |
623 | 2004 |
! ! |
2005 |
||
1810 | 2006 |
!Context class methodsFor:'documentation'! |
749 | 2007 |
|
2008 |
version |
|
7257 | 2009 |
^ '$Header: /cvs/stx/stx/libbasic/Context.st,v 1.116 2003-05-07 14:06:15 cg Exp $' |
749 | 2010 |
! ! |
7257 | 2011 |
|
623 | 2012 |
Context initialize! |