author | Claus Gittinger <cg@exept.de> |
Thu, 24 Apr 1997 16:23:20 +0200 | |
changeset 2585 | 6c25622320aa |
parent 2510 | 393a51424d60 |
child 2646 | 90bedd5a9f75 |
permissions | -rw-r--r-- |
1 | 1 |
" |
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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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Object variableSubclass:#Context |
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instanceVariableNames:'flags sender* home receiver selector searchClass lineNr retvalTemp |
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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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||
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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 |
|
154 | 26 |
All Rights Reserved |
88 | 27 |
|
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This software is furnished under a license and may be used |
|
29 |
only in accordance with the terms of that license and with the |
|
30 |
inclusion of the above copyright notice. This software may not |
|
31 |
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 |
40 |
state of a method or block (i.e. its local variables, temporaries etc.) |
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41 |
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 |
402 | 45 |
contexts on demand only). |
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|
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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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||
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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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402 | 63 |
Therefore, the implementation may be changed in the near future, to include a |
141 | 64 |
field for the method/block, and set it in the VM during program execution. |
65 |
(there may be some small performance penalty for this, though). |
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||
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LineNumbers vs. program counter: |
68 |
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69 |
Due to the compilation to machine code, methods and/or block do not |
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216 | 70 |
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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||
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Returning from a dead method: |
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||
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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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216 | 113 |
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sender <Context> the 'calling / sending' context |
216 | 115 |
|
1282 | 116 |
home <Context> the context, where this block was |
117 |
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 |
216 | 123 |
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selector <Symbol> the selector of this message |
216 | 125 |
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searchClass <Class> the class, where the message lookup started |
127 |
(for super sends) or nil, for regular sends. |
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lineNr <SmallInteger> the position where the context left off |
130 |
(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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|
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<indexed> arguments of the send followed by |
139 |
locals of the method/block followed by |
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temporaries. |
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[class variables:] |
143 |
InvalidReturnSignal signal raised when a block tries |
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to return ('^') from a method context |
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which itself has already returned |
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(i.e. there is no place to return to) |
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WARNING: layout and size known by the compiler and runtime system - do not change. |
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[author:] |
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Claus Gittinger |
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||
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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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" |
158 |
! ! |
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|
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!Context class methodsFor:'initialization'! |
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initialize |
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InvalidReturnSignal isNil ifTrue:[ |
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InvalidReturnSignal := ErrorSignal newSignalMayProceed:true. |
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InvalidReturnSignal nameClass:self message:#invalidReturnSignal. |
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InvalidReturnSignal notifierString:'invalid return; method cannot return twice'. |
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SingleStepInterruptRequest := QuerySignal new. |
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SingleStepInterruptRequest nameClass:self message:#singleStepInterruptRequest. |
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SingleStepInterruptRequest notifierString:'single step'. |
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] |
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"Modified: 6.5.1996 / 16:46:03 / cg" |
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! ! |
175 |
||
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!Context class methodsFor:'Signal constants'! |
105 | 177 |
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invalidReturnSignal |
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"return the signal used when a method is tried to be returned twice |
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or, when some dead context is unwound or restarted." |
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^ InvalidReturnSignal |
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! |
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singleStepInterruptRequest |
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"return the dummy query signal to ask for single stepping" |
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^ SingleStepInterruptRequest |
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"Created: 6.5.1996 / 16:46:32 / cg" |
105 | 191 |
! ! |
192 |
||
1810 | 193 |
!Context class methodsFor:'queries'! |
3 | 194 |
|
195 |
isBuiltInClass |
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1264 | 196 |
"return true if this class is known by the run-time-system. |
197 |
Here, true is returned." |
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199 |
^ true |
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"Modified: 23.4.1996 / 15:58:00 / cg" |
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! ! |
203 |
||
623 | 204 |
!Context methodsFor:'accessing'! |
205 |
||
206 |
argAt:n |
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207 |
"return the n'th argument" |
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208 |
||
1726 | 209 |
n > self numArgs ifTrue:[ |
210 |
^ self error:'invalid arg access' |
|
211 |
]. |
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623 | 212 |
^ self at:n |
1726 | 213 |
|
214 |
"Modified: 12.10.1996 / 21:44:28 / cg" |
|
623 | 215 |
! |
216 |
||
217 |
argAt:n put:value |
|
218 |
"set the n'th argument - useful when the receiver should be restarted" |
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154 | 219 |
|
1726 | 220 |
n > self numArgs ifTrue:[ |
221 |
^ self error:'invalid arg access' |
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222 |
]. |
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623 | 223 |
^ self at:n put:value |
1726 | 224 |
|
225 |
"Modified: 12.10.1996 / 21:44:32 / cg" |
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623 | 226 |
! |
227 |
||
228 |
args |
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229 |
"return an array filled with the arguments of this context" |
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230 |
||
231 |
|n| |
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232 |
||
233 |
n := self numArgs. |
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234 |
^ (Array new:n) replaceFrom:1 to:n with:self. |
|
235 |
! |
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154 | 236 |
|
623 | 237 |
argsAndVars |
238 |
"return an array filled with the arguments and variables of this context" |
|
239 |
||
240 |
|n| |
|
241 |
||
1810 | 242 |
n := self numArgs + self numVars. |
623 | 243 |
^ (Array new:n) replaceFrom:1 to:n with:self. |
1810 | 244 |
|
245 |
"Modified: 23.10.1996 / 16:19:41 / cg" |
|
623 | 246 |
! |
154 | 247 |
|
623 | 248 |
home |
249 |
"return the immediate home of the receiver. |
|
250 |
for block contexts, this is the methodcontext, where the block was created, |
|
251 |
for nested block contexts, its the surrounding blocks context. |
|
252 |
for method-contexts this is nil." |
|
25 | 253 |
|
623 | 254 |
^ nil "home" |
255 |
! |
|
1 | 256 |
|
257 |
instVarAt:index |
|
69 | 258 |
"have to catch instVar access to retVal and handle - they are invalid. |
259 |
Notice, that one of the next ST/X versions will get some syntactic |
|
260 |
extension to get this automatically)." |
|
1 | 261 |
|
262 |
(index == 8) ifTrue:[^ nil]. |
|
263 |
(index == 9) ifTrue:[^ nil]. |
|
264 |
^ super instVarAt:index |
|
265 |
! |
|
266 |
||
267 |
instVarAt:index put:value |
|
69 | 268 |
"have to catch instVar access to retVal and handle - they are invalid. |
269 |
Notice, that one of the next ST/X versions will get some syntactic |
|
270 |
extension to get this automatically)." |
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1 | 271 |
|
272 |
(index == 8) ifTrue:[^ nil]. |
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273 |
(index == 9) ifTrue:[^ nil]. |
|
274 |
^ super instVarAt:index put:value |
|
275 |
! |
|
276 |
||
623 | 277 |
lineNumber |
278 |
"this returns the lineNumber within the methods source, where the context was |
|
279 |
interrupted or called another method. (currently, sometimes this information |
|
280 |
is not available - in this case 0 is returned)" |
|
1 | 281 |
|
623 | 282 |
lineNr isNil ifTrue:[^ nil]. |
283 |
^ lineNr bitAnd:16rFFFF |
|
1 | 284 |
! |
285 |
||
286 |
method |
|
54 | 287 |
"return the method for which the receiver was created. |
288 |
To save time during normal execution, this information is not held in the |
|
289 |
context, but computed here on request." |
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1 | 290 |
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291 |
|c sender| |
1 | 292 |
|
325 | 293 |
c := self searchClass. |
294 |
" |
|
295 |
the below cannot happen in normal circumstances |
|
296 |
(added to avoid recursive errors in case of a broken sender chain) |
|
297 |
" |
|
298 |
c isBehavior ifFalse:[ |
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'Context [error]: non class in searchClass' errorPrintCR. |
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300 |
' selector: ' errorPrint. selector errorPrint. |
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301 |
' receiver: ' errorPrint. receiver errorPrintCR. |
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302 |
^ nil |
325 | 303 |
]. |
304 |
||
328 | 305 |
c := c whichClassIncludesSelector:selector. |
1 | 306 |
c notNil ifTrue:[ |
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307 |
^ c compiledMethodAt:selector |
1 | 308 |
]. |
216 | 309 |
|
310 |
"mhmh - seems to be a context for an unbound method; |
|
311 |
look in the senders context. Consider this a kludge. |
|
312 |
(maybe it was not too good of an idea to not keep the current |
|
325 | 313 |
method in the context .... |
314 |
future versions of ST/X's message lookup may store the method in |
|
315 |
the context.) |
|
216 | 316 |
" |
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317 |
sender := self sender. |
216 | 318 |
(sender notNil and:[sender selector startsWith:'valueWithReceiver:']) ifTrue:[ |
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319 |
^ sender receiver |
216 | 320 |
]. |
321 |
||
1 | 322 |
^ nil |
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324 |
"Modified: 10.1.1997 / 17:34:48 / cg" |
1 | 325 |
! |
326 |
||
212 | 327 |
methodClass |
328 |
"return the class in which the method for which the receiver was created is." |
|
329 |
||
1456 | 330 |
|cls m| |
331 |
||
332 |
cls := self searchClass. |
|
333 |
[cls notNil] whileTrue:[ |
|
334 |
cls := cls whichClassIncludesSelector:selector. |
|
335 |
cls isNil ifTrue:[^ nil]. |
|
336 |
||
337 |
m := cls compiledMethodAt:selector. |
|
338 |
m notNil ifTrue:[ |
|
339 |
m isIgnored ifFalse:[^ cls]. |
|
340 |
]. |
|
341 |
cls := cls superclass |
|
342 |
]. |
|
343 |
^ cls |
|
344 |
||
345 |
"Modified: 10.6.1996 / 14:34:59 / cg" |
|
212 | 346 |
! |
347 |
||
623 | 348 |
methodHome |
349 |
"return the method-home - for method contexts this is the receiver" |
|
350 |
||
351 |
^ self |
|
352 |
! |
|
353 |
||
354 |
ntemp |
|
355 |
"return the number of temporary variables of the Block/Method. |
|
1810 | 356 |
(for debugging only). |
357 |
I dont like the name of this method; its here for compatibility." |
|
623 | 358 |
|
1810 | 359 |
^ self numTemps |
360 |
||
361 |
"Modified: 23.10.1996 / 16:19:06 / cg" |
|
623 | 362 |
! |
363 |
||
364 |
numArgs |
|
365 |
"return the number of arguments to the Block/Method" |
|
366 |
||
367 |
%{ /* NOCONTEXT */ |
|
368 |
||
1133 | 369 |
RETURN ( __MKSMALLINT( (__intVal(__INST(flags)) >> __NARG_SHIFT) & __NARG_MASK) ); |
623 | 370 |
%} |
371 |
! |
|
372 |
||
1810 | 373 |
numTemps |
374 |
"return the number of temporary variables of the Block/Method. |
|
375 |
(for debugging only)" |
|
376 |
||
377 |
^ self size - self numArgs - self numVars |
|
378 |
||
379 |
"Created: 23.10.1996 / 16:19:10 / cg" |
|
380 |
"Modified: 23.10.1996 / 16:19:48 / cg" |
|
381 |
! |
|
382 |
||
383 |
numVars |
|
623 | 384 |
"return the number of local variables of the Block/Method" |
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385 |
|
623 | 386 |
%{ /* NOCONTEXT */ |
387 |
||
1133 | 388 |
RETURN ( __MKSMALLINT( (__intVal(__INST(flags)) >> __NVAR_SHIFT) & __NVAR_MASK) ); |
623 | 389 |
%} |
390 |
! |
|
391 |
||
1810 | 392 |
nvars |
393 |
"return the number of local variables of the Block/Method. |
|
394 |
I dont like the name of this method; its here for compatibility." |
|
395 |
||
396 |
^ self numVars |
|
397 |
||
398 |
"Modified: 23.10.1996 / 16:18:44 / cg" |
|
399 |
! |
|
400 |
||
623 | 401 |
receiver |
402 |
"return the receiver of the context" |
|
403 |
||
404 |
^ receiver |
|
405 |
! |
|
406 |
||
407 |
searchClass |
|
408 |
"this is the class where the method-lookup started; |
|
409 |
for normal sends, it is nil (or sometimes the receivers class). |
|
410 |
For supersends, its the superclass of the one, in which the |
|
411 |
caller was defined." |
|
412 |
||
413 |
searchClass notNil ifTrue:[^ searchClass]. |
|
414 |
^ receiver class |
|
415 |
! |
|
416 |
||
417 |
selector |
|
418 |
"return the selector of the method for which the context was created" |
|
419 |
||
420 |
^ selector |
|
536
dcffd1753902
be safe, when accessing a contexts sender.
Claus Gittinger <cg@exept.de>
parents:
528
diff
changeset
|
421 |
! |
dcffd1753902
be safe, when accessing a contexts sender.
Claus Gittinger <cg@exept.de>
parents:
528
diff
changeset
|
422 |
|
1 | 423 |
sender |
424 |
"return the sender of the context" |
|
425 |
||
536
dcffd1753902
be safe, when accessing a contexts sender.
Claus Gittinger <cg@exept.de>
parents:
528
diff
changeset
|
426 |
%{ /* NOCONTEXT */ |
1668
41db5950f9ea
oops - con local variables are now renamed (last change in stc)
Claus Gittinger <cg@exept.de>
parents:
1492
diff
changeset
|
427 |
OBJ theContext; |
536
dcffd1753902
be safe, when accessing a contexts sender.
Claus Gittinger <cg@exept.de>
parents:
528
diff
changeset
|
428 |
|
949 | 429 |
/* |
430 |
* this special nil test is for the very first context (startup-context); |
|
431 |
* actually, its cosmetics, to avoid a visible nil>>nil context in the debugger. |
|
432 |
*/ |
|
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
433 |
theContext = __INST(sender_); |
2205 | 434 |
if (__isNonNilObject(theContext)) { |
949 | 435 |
|
1668
41db5950f9ea
oops - con local variables are now renamed (last change in stc)
Claus Gittinger <cg@exept.de>
parents:
1492
diff
changeset
|
436 |
if (__isLazy(theContext)) { |
536
dcffd1753902
be safe, when accessing a contexts sender.
Claus Gittinger <cg@exept.de>
parents:
528
diff
changeset
|
437 |
/* |
dcffd1753902
be safe, when accessing a contexts sender.
Claus Gittinger <cg@exept.de>
parents:
528
diff
changeset
|
438 |
* this cannot happen |
dcffd1753902
be safe, when accessing a contexts sender.
Claus Gittinger <cg@exept.de>
parents:
528
diff
changeset
|
439 |
*/ |
2212 | 440 |
__PATCHUPCONTEXT(theContext); |
536
dcffd1753902
be safe, when accessing a contexts sender.
Claus Gittinger <cg@exept.de>
parents:
528
diff
changeset
|
441 |
} |
591
11433f47b12b
added a method to print a contexts method
Claus Gittinger <cg@exept.de>
parents:
564
diff
changeset
|
442 |
/* |
11433f47b12b
added a method to print a contexts method
Claus Gittinger <cg@exept.de>
parents:
564
diff
changeset
|
443 |
* to be prepared for the worst situation |
11433f47b12b
added a method to print a contexts method
Claus Gittinger <cg@exept.de>
parents:
564
diff
changeset
|
444 |
* (the sender is not stored, so the trap wont catch it) |
11433f47b12b
added a method to print a contexts method
Claus Gittinger <cg@exept.de>
parents:
564
diff
changeset
|
445 |
* make the writeBarrier trigger manually. |
11433f47b12b
added a method to print a contexts method
Claus Gittinger <cg@exept.de>
parents:
564
diff
changeset
|
446 |
* We'll see, if this is really required. |
11433f47b12b
added a method to print a contexts method
Claus Gittinger <cg@exept.de>
parents:
564
diff
changeset
|
447 |
*/ |
1668
41db5950f9ea
oops - con local variables are now renamed (last change in stc)
Claus Gittinger <cg@exept.de>
parents:
1492
diff
changeset
|
448 |
theContext->o_space |= CATCHMARK; |
41db5950f9ea
oops - con local variables are now renamed (last change in stc)
Claus Gittinger <cg@exept.de>
parents:
1492
diff
changeset
|
449 |
_markNonLIFO(theContext); |
536
dcffd1753902
be safe, when accessing a contexts sender.
Claus Gittinger <cg@exept.de>
parents:
528
diff
changeset
|
450 |
} |
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
451 |
RETURN (theContext); |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
452 |
%} |
1 | 453 |
! |
454 |
||
2510
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
455 |
senderIsNil |
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
456 |
"return true, if I have no sender" |
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
457 |
|
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
458 |
%{ /* NOCONTEXT */ |
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
459 |
if ( __INST(sender_) == nil ) { |
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
460 |
RETURN (true); |
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
461 |
} |
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
462 |
RETURN (false); |
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
463 |
%} |
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
464 |
! |
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
465 |
|
623 | 466 |
setLineNumber:aNumber |
467 |
"private entry for uncompiledCodeObject ..." |
|
1 | 468 |
|
623 | 469 |
lineNr := aNumber |
340 | 470 |
! |
471 |
||
202 | 472 |
temporaries |
473 |
"return an array filled with the temporaries of this context" |
|
474 |
||
308 | 475 |
|nonTemps mySize| |
202 | 476 |
|
1810 | 477 |
nonTemps := self numArgs + self numVars. |
478 |
mySize := self numTemps. |
|
308 | 479 |
^ (Array new:mySize) replaceFrom:1 to:mySize with:self startingAt:nonTemps+1 |
1810 | 480 |
|
481 |
"Modified: 23.10.1996 / 16:20:00 / cg" |
|
202 | 482 |
! |
483 |
||
10 | 484 |
varAt:n |
485 |
"return the n'th local variable" |
|
486 |
||
154 | 487 |
^ self at:(n + self numArgs) |
10 | 488 |
! |
489 |
||
490 |
varAt:n put:value |
|
491 |
"set the n'th local variable - useful when the receiver should be restarted |
|
54 | 492 |
or continued" |
10 | 493 |
|
154 | 494 |
self at:(n + self numArgs) put:value |
10 | 495 |
! |
496 |
||
623 | 497 |
vars |
498 |
"return an array filled with the local variables of this context" |
|
375 | 499 |
|
623 | 500 |
|nonVars mySize| |
360 | 501 |
|
623 | 502 |
nonVars := self numArgs. |
1810 | 503 |
mySize := self numVars. |
623 | 504 |
^ (Array new:mySize) replaceFrom:1 to:mySize with:self startingAt:nonVars+1 |
1810 | 505 |
|
506 |
"Modified: 23.10.1996 / 16:20:06 / cg" |
|
1 | 507 |
! ! |
508 |
||
623 | 509 |
!Context methodsFor:'copying'! |
415 | 510 |
|
623 | 511 |
deepCopy |
512 |
"raise an error - deepCopy is not allowed for contexts" |
|
37 | 513 |
|
623 | 514 |
^ self deepCopyError |
1 | 515 |
! ! |
516 |
||
77 | 517 |
!Context methodsFor:'error handling'! |
518 |
||
519 |
invalidReturn:returnValue |
|
520 |
"this message is sent by the VM, when a methods context |
|
521 |
which has already returned is about to return again. |
|
522 |
(i.e. about to execute a return from an already returned |
|
105 | 523 |
method in a block). |
141 | 524 |
We raise a signal here, to allow catching of that situation." |
77 | 525 |
|
406 | 526 |
" |
527 |
in previous versions of ST/X and ST-80, this was no error; |
|
528 |
(instead, a normal blockreturn was performed to the value-sender). |
|
529 |
From a note in comp.lang.smalltalk, I conclude that new ST-80 versions |
|
530 |
now raise an error if this happens. |
|
531 |
Comment out the raise below to get that (old) behavior |
|
532 |
BETTER REWRITE YOUR APPLICATION |
|
533 |
" |
|
282 | 534 |
"/ new behavior: |
535 |
||
406 | 536 |
^ InvalidReturnSignal |
537 |
raiseRequestWith:returnValue. |
|
282 | 538 |
|
539 |
"/ old behavior: |
|
406 | 540 |
"/ ^ returnValue |
541 |
! |
|
542 |
||
543 |
invalidReturnOrRestart:returnValue |
|
544 |
"this message is sent by the VM, when a methods context |
|
545 |
which was compiled non-returnable is about to return again. |
|
546 |
We raise a signal here, to allow catching of that situation." |
|
547 |
||
360 | 548 |
^ InvalidReturnSignal |
549 |
raiseRequestWith:returnValue |
|
550 |
errorString:'method was compiled non-resumable' |
|
551 |
! |
|
552 |
||
553 |
invalidReturnOrRestartError:how with:value |
|
554 |
"common error reporter for restart/return errors" |
|
555 |
||
556 |
self canReturn ifTrue:[ |
|
379 | 557 |
" |
558 |
tried to return from/restart a context which is already dead |
|
559 |
(i.e. the method/block has already executed a return) |
|
560 |
" |
|
561 |
^ InvalidReturnSignal |
|
360 | 562 |
raiseRequestWith:value |
563 |
errorString:(how , ': context not on calling chain') |
|
564 |
]. |
|
565 |
" |
|
566 |
tried to return from/restart a context of a method which was compiled |
|
567 |
unrestartable or of a block (which is never restartable) |
|
568 |
" |
|
569 |
^ InvalidReturnSignal |
|
379 | 570 |
raiseRequestWith:value |
360 | 571 |
errorString:(how , ': context cannot be restarted/returned from') |
77 | 572 |
! ! |
573 |
||
2205 | 574 |
!Context methodsFor:'exception support'! |
575 |
||
2291
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
576 |
findNextContextWithSelector:selector1 or:selector2 |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
577 |
"walk along the sender chain (starting with the sender), |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
578 |
for a context with either one of the given selectors. |
2205 | 579 |
This non-standard interface is only to be used by exception" |
580 |
||
2291
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
581 |
"/ this could have been (actually: was) implemented as: |
2205 | 582 |
"/ |
2291
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
583 |
"/ |con| |
2205 | 584 |
"/ |
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
585 |
"/ con := self sender. |
2291
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
586 |
"/ [con notNil] whileTrue:[ |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
587 |
"/ con selector == aSelector ifTrue:[^ con]. |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
588 |
"/ con := con sender. |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
589 |
"/ ]. |
2205 | 590 |
"/ ^ nil |
591 |
"/ |
|
2291
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
592 |
"/ and the code below does exactly this (somewhat faster, though). |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
593 |
"/ |
2285 | 594 |
"/ (it avoids referencing all intermediate contexts, which would mark them special, |
595 |
"/ although they aren't really - this is expert knowledge, no need to understand that ...) |
|
2205 | 596 |
|
597 |
%{ /* NOCONTEXT */ |
|
598 |
||
599 |
OBJ theContext; |
|
600 |
OBJ sel; |
|
2255
0e4c8d88a65d
can search for a context, without PATCHING them all
Claus Gittinger <cg@exept.de>
parents:
2212
diff
changeset
|
601 |
OBJ __FETCHSELECTOR(); |
2205 | 602 |
|
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
603 |
theContext = __INST(sender_); |
2205 | 604 |
while (__isNonNilObject(theContext)) { |
605 |
if (__isLazy(theContext)) { |
|
2291
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
606 |
#ifdef TRADITIONAL_STACK_FRAME |
2255
0e4c8d88a65d
can search for a context, without PATCHING them all
Claus Gittinger <cg@exept.de>
parents:
2212
diff
changeset
|
607 |
sel = __FETCHSELECTOR(theContext); |
0e4c8d88a65d
can search for a context, without PATCHING them all
Claus Gittinger <cg@exept.de>
parents:
2212
diff
changeset
|
608 |
#else |
2291
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
609 |
/* mhmh - not really needed */ |
2212 | 610 |
__PATCHUPCONTEXT(theContext); |
2255
0e4c8d88a65d
can search for a context, without PATCHING them all
Claus Gittinger <cg@exept.de>
parents:
2212
diff
changeset
|
611 |
sel = __ContextInstPtr(theContext)->c_selector; |
0e4c8d88a65d
can search for a context, without PATCHING them all
Claus Gittinger <cg@exept.de>
parents:
2212
diff
changeset
|
612 |
#endif |
0e4c8d88a65d
can search for a context, without PATCHING them all
Claus Gittinger <cg@exept.de>
parents:
2212
diff
changeset
|
613 |
} else { |
0e4c8d88a65d
can search for a context, without PATCHING them all
Claus Gittinger <cg@exept.de>
parents:
2212
diff
changeset
|
614 |
sel = __ContextInstPtr(theContext)->c_selector; |
0e4c8d88a65d
can search for a context, without PATCHING them all
Claus Gittinger <cg@exept.de>
parents:
2212
diff
changeset
|
615 |
} |
2205 | 616 |
|
617 |
if ((sel == selector1) |
|
618 |
|| ((selector2 != nil) && (sel == selector2))) { |
|
2255
0e4c8d88a65d
can search for a context, without PATCHING them all
Claus Gittinger <cg@exept.de>
parents:
2212
diff
changeset
|
619 |
if (__isLazy(theContext)) { |
0e4c8d88a65d
can search for a context, without PATCHING them all
Claus Gittinger <cg@exept.de>
parents:
2212
diff
changeset
|
620 |
__PATCHUPCONTEXT(theContext); |
0e4c8d88a65d
can search for a context, without PATCHING them all
Claus Gittinger <cg@exept.de>
parents:
2212
diff
changeset
|
621 |
} |
0e4c8d88a65d
can search for a context, without PATCHING them all
Claus Gittinger <cg@exept.de>
parents:
2212
diff
changeset
|
622 |
|
0e4c8d88a65d
can search for a context, without PATCHING them all
Claus Gittinger <cg@exept.de>
parents:
2212
diff
changeset
|
623 |
if (! __isNonLIFO(theContext)) { |
0e4c8d88a65d
can search for a context, without PATCHING them all
Claus Gittinger <cg@exept.de>
parents:
2212
diff
changeset
|
624 |
/* |
0e4c8d88a65d
can search for a context, without PATCHING them all
Claus Gittinger <cg@exept.de>
parents:
2212
diff
changeset
|
625 |
* to be prepared for the worst situation |
0e4c8d88a65d
can search for a context, without PATCHING them all
Claus Gittinger <cg@exept.de>
parents:
2212
diff
changeset
|
626 |
* (the sender is not stored, so the trap wont catch it) |
0e4c8d88a65d
can search for a context, without PATCHING them all
Claus Gittinger <cg@exept.de>
parents:
2212
diff
changeset
|
627 |
* make the writeBarrier trigger manually. |
0e4c8d88a65d
can search for a context, without PATCHING them all
Claus Gittinger <cg@exept.de>
parents:
2212
diff
changeset
|
628 |
* We'll see, if this is really required. |
0e4c8d88a65d
can search for a context, without PATCHING them all
Claus Gittinger <cg@exept.de>
parents:
2212
diff
changeset
|
629 |
*/ |
0e4c8d88a65d
can search for a context, without PATCHING them all
Claus Gittinger <cg@exept.de>
parents:
2212
diff
changeset
|
630 |
theContext->o_space |= CATCHMARK; |
0e4c8d88a65d
can search for a context, without PATCHING them all
Claus Gittinger <cg@exept.de>
parents:
2212
diff
changeset
|
631 |
_markNonLIFO(theContext); |
0e4c8d88a65d
can search for a context, without PATCHING them all
Claus Gittinger <cg@exept.de>
parents:
2212
diff
changeset
|
632 |
} |
2205 | 633 |
RETURN (theContext); |
634 |
} |
|
635 |
theContext = __ContextInstPtr(theContext)->c_sender; |
|
636 |
} |
|
637 |
%}. |
|
638 |
^ nil |
|
2291
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
639 |
! |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
640 |
|
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
641 |
findNextUnwindContextOr:aContext |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
642 |
"walk along the sender chain (starting at the sender), |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
643 |
for a context marked for unwindAction or aContext. |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
644 |
This non-standard interface is only to be used by mySelf" |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
645 |
|
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
646 |
"/ this could have been (actually: was) implemented as: |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
647 |
"/ |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
648 |
"/ |con| |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
649 |
"/ |
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
650 |
"/ con := self sender. |
2291
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
651 |
"/ [con notNil |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
652 |
"/ and:[con ~~ aContext |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
653 |
"/ and:[con isUnwindContext not]]] whileTrue:[con := con sender]. |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
654 |
"/ ^ con |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
655 |
"/ |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
656 |
"/ and the code below does exactly this (somewhat faster, though). |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
657 |
"/ (it avoids referencing all intermediate contexts, which would mark them special, |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
658 |
"/ although they aren't really - this is expert knowledge, no need to understand that ...) |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
659 |
|
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
660 |
%{ /* NOCONTEXT */ |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
661 |
|
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
662 |
OBJ theContext; |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
663 |
|
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
664 |
if (self == aContext) { |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
665 |
RETURN (self); |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
666 |
} |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
667 |
|
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
668 |
theContext = __INST(sender_); |
2291
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
669 |
while (__isNonNilObject(theContext)) { |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
670 |
if ((theContext == aContext) |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
671 |
|| ((INT)(__ContextInstPtr(theContext)->c_flags) & __MASKSMALLINT(__UNWIND_MARK))) { |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
672 |
if (__isLazy(theContext)) { |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
673 |
__PATCHUPCONTEXT(theContext); |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
674 |
} |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
675 |
if (! __isNonLIFO(theContext)) { |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
676 |
/* |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
677 |
* to be prepared for the worst situation |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
678 |
* (the sender is not stored, so the trap wont catch it) |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
679 |
* make the writeBarrier trigger manually. |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
680 |
* We'll see, if this is really required. |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
681 |
*/ |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
682 |
theContext->o_space |= CATCHMARK; |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
683 |
_markNonLIFO(theContext); |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
684 |
} |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
685 |
RETURN (theContext); |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
686 |
} |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
687 |
theContext = __ContextInstPtr(theContext)->c_sender; |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
688 |
} |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
689 |
%}. |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
690 |
^ nil |
2205 | 691 |
! ! |
692 |
||
623 | 693 |
!Context methodsFor:'minidebugger printing'! |
694 |
||
695 |
fullPrint |
|
696 |
"print the receiver, selector and args of the context |
|
697 |
- used only for MiniDebuggers walkback print" |
|
698 |
||
699 |
self receiverPrintString print. ' ' print. selector print. |
|
700 |
self size ~~ 0 ifTrue: [ |
|
1426 | 701 |
' ' print. self argsDisplayString print |
623 | 702 |
]. |
1426 | 703 |
' [' print. self lineNumber print. ']' printCR |
623 | 704 |
|
705 |
" |
|
706 |
thisContext fullPrint |
|
707 |
" |
|
1426 | 708 |
|
709 |
"Modified: 20.5.1996 / 10:27:14 / cg" |
|
623 | 710 |
! |
711 |
||
712 |
fullPrintAll |
|
713 |
"print a full walkback starting at the receiver |
|
714 |
- used only for MiniDebuggers walkback print" |
|
715 |
||
716 |
|context| |
|
717 |
||
718 |
context := self. |
|
719 |
[context notNil] whileTrue: [ |
|
720 |
context fullPrint. |
|
721 |
context := context sender |
|
722 |
] |
|
723 |
||
724 |
" |
|
725 |
thisContext fullPrintAll |
|
726 |
" |
|
2173 | 727 |
! |
728 |
||
729 |
fullPrintAllOn:aStream |
|
730 |
"print a full walkback starting at the receiver |
|
731 |
- used only for MiniDebuggers walkback print" |
|
732 |
||
733 |
|context| |
|
734 |
||
735 |
context := self. |
|
736 |
[context notNil] whileTrue: [ |
|
737 |
context fullPrintOn:aStream. |
|
738 |
context := context sender |
|
739 |
] |
|
740 |
||
741 |
" |
|
742 |
thisContext fullPrintAllOn:Transcript |
|
743 |
" |
|
744 |
||
745 |
"Created: 15.1.1997 / 18:09:05 / cg" |
|
746 |
! |
|
747 |
||
748 |
fullPrintOn:aStream |
|
749 |
"print the receiver, selector and args of the context |
|
750 |
- used only for MiniDebuggers walkback print" |
|
751 |
||
752 |
self receiverPrintString printOn:aStream. ' ' printOn:aStream. selector printOn:aStream. |
|
753 |
self size ~~ 0 ifTrue: [ |
|
754 |
' ' printOn:aStream. self argsDisplayString printOn:aStream |
|
755 |
]. |
|
756 |
' [' printOn:aStream. self lineNumber printOn:aStream. ']' printOn:aStream. |
|
757 |
aStream cr |
|
758 |
||
759 |
" |
|
760 |
thisContext fullPrintOn:Transcript |
|
761 |
" |
|
762 |
||
763 |
"Modified: 20.5.1996 / 10:27:14 / cg" |
|
764 |
"Created: 15.1.1997 / 18:09:06 / cg" |
|
623 | 765 |
! ! |
766 |
||
1 | 767 |
!Context methodsFor:'non local control flow'! |
768 |
||
769 |
restart |
|
770 |
"restart the receiver - i.e. the method is evaluated again. |
|
402 | 771 |
if the context to restart already died, trigger an error. |
141 | 772 |
This is a low level helper for unwindAndRestart. |
773 |
||
774 |
NOTICE: |
|
154 | 775 |
NO unwind actions are performed - this is usually not |
776 |
what you want (see Context>>unwindAndRestart). |
|
141 | 777 |
|
778 |
LIMITATION: |
|
154 | 779 |
currently a context can only be restarted by |
928 | 780 |
the owning process - not from outside. |
781 |
Also, the compiler has an option (+optcontext) to create |
|
782 |
non-restartable contexts (which are faster). |
|
783 |
If such a context is restarted, a runtime error is raised." |
|
1 | 784 |
|
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
785 |
%{ /* NOCONTEXT */ |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
786 |
if (__INST(sender_) != nil) { |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
787 |
__RESUMECONTEXT__(self, RESTART_VALUE, 0); |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
788 |
} |
360 | 789 |
%}. |
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
790 |
self sender isNil ifTrue:[^ nil]. |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
791 |
|
69 | 792 |
" |
360 | 793 |
when we arrive here, something went wrong. |
69 | 794 |
debugging ... |
795 |
" |
|
360 | 796 |
^ self invalidReturnOrRestartError:#restart with:nil |
1 | 797 |
! |
798 |
||
623 | 799 |
resume |
800 |
"resume execution in this context. I.e. as if the method called |
|
801 |
last by the receiver did a ^ nil. |
|
802 |
If the context has already returned, report an error. |
|
803 |
||
804 |
NOTICE: |
|
805 |
NO unwind actions are performed (see Context>>unwind). |
|
806 |
||
807 |
LIMITATION: |
|
808 |
currently a context can only be resumed by |
|
928 | 809 |
the owning process - not from outside. |
810 |
Also, the compiler has an option (+optcontext) to create |
|
811 |
non-resumable contexts (which are faster). |
|
812 |
If such a context is restarted, a runtime error is raised." |
|
623 | 813 |
|
814 |
^ self resume:nil |
|
815 |
! |
|
816 |
||
817 |
resume:value |
|
818 |
"resume the receiver - as if it got 'value' from whatever |
|
819 |
it called. This continues execution in the receivers method |
|
820 |
after the point where it did its last send. |
|
821 |
If the context has already returned - report an error. |
|
822 |
||
823 |
NOTICE: |
|
824 |
NO unwind actions are performed (see Context>>unwind:). |
|
825 |
||
826 |
LIMITATION: |
|
827 |
currently a context can only be resumed by |
|
928 | 828 |
the owning process - not from outside. |
829 |
Also, the compiler has an option (+optcontext) to create |
|
830 |
non-resumable contexts (which are faster). |
|
831 |
If such a context is restarted, a runtime error is raised." |
|
623 | 832 |
|
1668
41db5950f9ea
oops - con local variables are now renamed (last change in stc)
Claus Gittinger <cg@exept.de>
parents:
1492
diff
changeset
|
833 |
|theContext| |
623 | 834 |
|
835 |
" |
|
2510
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
836 |
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
|
837 |
(i.e. the one that I have called) and return from it. |
623 | 838 |
" |
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
839 |
|
2510
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
840 |
%{ |
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
841 |
theContext = __thisContext; |
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
842 |
while ((theContext != nil) |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
843 |
&& (__ContextInstPtr(theContext)->c_sender != self)) { |
1668
41db5950f9ea
oops - con local variables are now renamed (last change in stc)
Claus Gittinger <cg@exept.de>
parents:
1492
diff
changeset
|
844 |
theContext = __ContextInstPtr(theContext)->c_sender; |
623 | 845 |
} |
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
846 |
if (theContext) { |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
847 |
if (__isLazy(theContext)) { |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
848 |
__PATCHUPCONTEXT(theContext); |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
849 |
} |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
850 |
} |
623 | 851 |
%}. |
852 |
||
1668
41db5950f9ea
oops - con local variables are now renamed (last change in stc)
Claus Gittinger <cg@exept.de>
parents:
1492
diff
changeset
|
853 |
theContext isNil ifTrue:[ |
623 | 854 |
" |
855 |
tried to resume in context which is already dead |
|
856 |
(i.e. the method/block has already executed a return) |
|
857 |
" |
|
1668
41db5950f9ea
oops - con local variables are now renamed (last change in stc)
Claus Gittinger <cg@exept.de>
parents:
1492
diff
changeset
|
858 |
^ theContext invalidReturnOrRestartError:#resume with:value |
623 | 859 |
]. |
1668
41db5950f9ea
oops - con local variables are now renamed (last change in stc)
Claus Gittinger <cg@exept.de>
parents:
1492
diff
changeset
|
860 |
^ theContext return:value |
623 | 861 |
! |
862 |
||
69 | 863 |
return |
141 | 864 |
"return from this context with nil. I.e. as if it did a ^ nil. |
865 |
NOTICE: |
|
154 | 866 |
NO unwind actions are performed - this is usually not |
867 |
what you want (See Context>>unwind). |
|
868 |
This is a low level method - a helper for unwind. |
|
1 | 869 |
|
141 | 870 |
LIMITATION: |
154 | 871 |
currently a context can only be returned by |
928 | 872 |
the owning process - not from outside. |
873 |
Also, the compiler has an option (+optcontext) to create |
|
874 |
non-returnable contexts (which are faster). |
|
875 |
If such a context is restarted, a runtime error is raised." |
|
141 | 876 |
|
877 |
^ self return:nil |
|
1 | 878 |
! |
879 |
||
69 | 880 |
return:value |
881 |
"return from this context as if it did a '^ value'. |
|
141 | 882 |
NOTICE: |
402 | 883 |
NO unwind actions are performed - this is usually not |
154 | 884 |
what you want (See Context>>unwind:). |
885 |
This is a low level method - a helper for unwind. |
|
141 | 886 |
|
887 |
LIMITATION: |
|
154 | 888 |
currently a context can only be returned by |
928 | 889 |
the owning process - not from outside. |
890 |
Also, the compiler has an option (+optcontext) to create |
|
891 |
non-returnable contexts (which are faster). |
|
892 |
If such a context is restarted, a runtime error is raised." |
|
1 | 893 |
|
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
894 |
%{ /* NOCONTEXT */ |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
895 |
if (__INST(sender_) != nil) { |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
896 |
__RESUMECONTEXT__(self, value, 0); |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
897 |
} |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
898 |
%}. |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
899 |
self sender isNil ifTrue:[^ nil]. |
1 | 900 |
|
69 | 901 |
" |
360 | 902 |
when we arrive here, something went wrong. |
69 | 903 |
debugging ... |
904 |
" |
|
360 | 905 |
^ self invalidReturnOrRestartError:#return with:value |
1 | 906 |
! |
907 |
||
328 | 908 |
returnDoing:aBlock |
909 |
"return from this context as if it did a '^ aBlock value'. |
|
910 |
The block is evaluated as if called by the receiver context; |
|
911 |
NOT the true executing context. |
|
912 |
NOTICE: |
|
402 | 913 |
NO unwind actions are performed - this is usually not |
914 |
what you want (See Context>>unwindThenDo:). |
|
328 | 915 |
This is a low level method - a helper for unwind. |
916 |
||
917 |
LIMITATION: |
|
918 |
currently a context can only be returned by |
|
928 | 919 |
the owning process - not from outside. |
920 |
Also, the compiler has an option (+optcontext) to create |
|
921 |
non-returnable contexts (which are faster). |
|
922 |
If such a context is restarted, a runtime error is raised." |
|
328 | 923 |
|
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
924 |
%{ /* NOCONTEXT */ |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
925 |
if (__INST(sender_) != nil) { |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
926 |
__RESUMECONTEXT__(self, aBlock, 2); |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
927 |
} |
360 | 928 |
%}. |
2368
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
929 |
self sender isNil ifTrue:[^ nil]. |
f13bc879cb45
dont allow direct access to sender
Claus Gittinger <cg@exept.de>
parents:
2291
diff
changeset
|
930 |
|
328 | 931 |
" |
360 | 932 |
when we arrive here, something went wrong. |
328 | 933 |
debugging ... |
934 |
" |
|
360 | 935 |
^ self invalidReturnOrRestartError:#return with:aBlock |
328 | 936 |
! |
937 |
||
1 | 938 |
unwind |
69 | 939 |
"return nil from the receiver - i.e. simulate a '^ nil'. |
360 | 940 |
If the context has already retruned, report an error. |
1 | 941 |
Evaluate all unwind-blocks as specified in Block>>valueNowOrOnUnwind: |
69 | 942 |
and Block>>valueOnUnwindDo: on the way. |
1 | 943 |
|
141 | 944 |
LIMITATION: |
154 | 945 |
currently a context can only be unwound by |
928 | 946 |
the owning process - not from outside. |
947 |
Also, the compiler has an option (+optcontext) to create |
|
948 |
non-returnable contexts (which are faster). |
|
949 |
If such a context is restarted, a runtime error is raised." |
|
141 | 950 |
|
951 |
^ self unwind:nil |
|
1 | 952 |
! |
953 |
||
954 |
unwind:value |
|
69 | 955 |
"return value from the receiver - i.e. simulate a '^ value'. |
360 | 956 |
If the context has already returned , report an error. |
1 | 957 |
Evaluate all unwind-blocks as specified in Block>>valueNowOrOnUnwind: |
69 | 958 |
and Block>>valueOnUnwindDo: on the way. |
141 | 959 |
|
960 |
LIMITATION: |
|
154 | 961 |
currently a context can only be unwound by |
928 | 962 |
the owning process - not from outside. |
963 |
Also, the compiler has an option (+optcontext) to create |
|
964 |
non-returnable contexts (which are faster). |
|
965 |
If such a context is restarted, a runtime error is raised." |
|
1 | 966 |
|
559 | 967 |
|con unwindBlock| |
1 | 968 |
|
2510
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
969 |
self senderIsNil ifTrue:[ |
154 | 970 |
" |
971 |
tried to return to a context which is already dead |
|
972 |
(i.e. the method/block has already executed a return) |
|
973 |
" |
|
379 | 974 |
^ self invalidReturnOrRestartError:#unwind with:value |
141 | 975 |
]. |
1 | 976 |
|
141 | 977 |
" |
978 |
start with this context, moving up, looking for unwind actions |
|
979 |
" |
|
2291
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
980 |
con := thisContext findNextUnwindContextOr:self. |
69 | 981 |
[con notNil and:[con ~~ self]] whileTrue:[ |
2291
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
982 |
"/ |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
983 |
"/ mhmh - hardwired knowledge about those methods (taking the 1st arg) |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
984 |
"/ |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
985 |
unwindBlock := con argAt:1. |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
986 |
con unmarkForUnwind. |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
987 |
unwindBlock value. |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
988 |
|
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
989 |
con := con findNextUnwindContextOr:self. |
1 | 990 |
]. |
69 | 991 |
|
141 | 992 |
"oops, I am not on the calling chain |
993 |
(should we check for this situation first and NOT evaluate |
|
994 |
the unwind actions in this case ?) |
|
995 |
" |
|
69 | 996 |
con isNil ifTrue:[ |
154 | 997 |
" |
998 |
tried to return to a context which is already dead |
|
999 |
(i.e. the method/block has already executed a return) |
|
1000 |
" |
|
379 | 1001 |
^ self invalidReturnOrRestartError:#unwind with:value |
69 | 1002 |
]. |
141 | 1003 |
" |
1004 |
now, that all unwind-actions are done, I can use the |
|
1005 |
low-level return ... |
|
1006 |
" |
|
1007 |
^ self return:value |
|
1008 |
! |
|
1009 |
||
1010 |
unwindAndRestart |
|
1011 |
"restart the receiver - i.e. the method is evaluated again. |
|
402 | 1012 |
if the context to restart already died report an error. |
141 | 1013 |
Evaluate all unwind-blocks as specified in Block>>valueNowOrOnUnwind: |
1014 |
and Block>>valueOnUnwindDo: before restarting. |
|
1015 |
||
1016 |
LIMITATION: |
|
154 | 1017 |
currently a context can only be restarted by |
928 | 1018 |
the owning process - not from outside. |
1019 |
Also, the compiler has an option (+optcontext) to create |
|
1020 |
non-restartable contexts (which are faster). |
|
1021 |
If such a context is restarted, a runtime error is raised." |
|
141 | 1022 |
|
559 | 1023 |
|con unwindBlock| |
141 | 1024 |
|
1025 |
" |
|
1026 |
start with this context, moving up, looking for unwind actions |
|
1027 |
" |
|
2291
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1028 |
con := thisContext findNextUnwindContextOr:self. |
141 | 1029 |
[con notNil and:[con ~~ self]] whileTrue:[ |
2291
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1030 |
"/ |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1031 |
"/ mhmh - hardwired knowledge about those methods (taking the 1st arg) |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1032 |
"/ |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1033 |
unwindBlock := con argAt:1. |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1034 |
con unmarkForUnwind. |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1035 |
unwindBlock value. |
552
694ecccaa1a0
only evaluate unwind blocks once
Claus Gittinger <cg@exept.de>
parents:
536
diff
changeset
|
1036 |
|
2291
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1037 |
con := con findNextUnwindContextOr:self. |
141 | 1038 |
]. |
1039 |
||
1040 |
"oops, I am not on the calling chain |
|
1041 |
(should we check for this situation first and NOT evaluate |
|
1042 |
the unwind actions in this case ?) |
|
1043 |
" |
|
1044 |
con isNil ifTrue:[ |
|
154 | 1045 |
" |
1046 |
tried to return to a context which is already dead |
|
1047 |
(i.e. the method/block has already executed a return) |
|
1048 |
" |
|
379 | 1049 |
^ self invalidReturnOrRestartError:#unwindAndRestart with:nil |
141 | 1050 |
]. |
1051 |
" |
|
1052 |
now, that all unwind-actions are done, I can use the |
|
1053 |
low-level restart ... |
|
1054 |
" |
|
1055 |
^ self restart |
|
328 | 1056 |
! |
1057 |
||
1058 |
unwindThenDo:aBlock |
|
1059 |
"return the value of aBlock from the receiver - i.e. simulate a '^ aBlock value'. |
|
360 | 1060 |
If the context has already returned , report an error. |
328 | 1061 |
Evaluate all unwind-blocks as specified in Block>>valueNowOrOnUnwind: |
1062 |
and Block>>valueOnUnwindDo: on the way. |
|
1063 |
The block is evaluated AFTER all unwind actions are performed |
|
1064 |
(i.e. the blocks sender will be the receiving context, not the |
|
402 | 1065 |
currently executing context) |
328 | 1066 |
|
1067 |
LIMITATION: |
|
1068 |
currently a context can only be unwound by |
|
928 | 1069 |
the owning process - not from outside. |
1070 |
Also, the compiler has an option (+optcontext) to create |
|
1071 |
non-returnable contexts (which are faster). |
|
1072 |
If such a context is restarted, a runtime error is raised." |
|
328 | 1073 |
|
559 | 1074 |
|con unwindBlock| |
328 | 1075 |
|
2510
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
1076 |
self senderIsNil ifTrue:[ |
328 | 1077 |
" |
1078 |
tried to return to a context which is already dead |
|
1079 |
(i.e. the method/block has already executed a return) |
|
1080 |
" |
|
379 | 1081 |
^ self invalidReturnOrRestartError:#unwind with:aBlock |
328 | 1082 |
]. |
1083 |
||
1084 |
" |
|
1085 |
start with this context, moving up, looking for unwind actions |
|
1086 |
" |
|
2291
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1087 |
con := thisContext findNextUnwindContextOr:self. |
328 | 1088 |
[con notNil and:[con ~~ self]] whileTrue:[ |
2291
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1089 |
"/ |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1090 |
"/ mhmh - hardwired knowledge about those methods (taking the 1st arg) |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1091 |
"/ |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1092 |
unwindBlock := con argAt:1. |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1093 |
con unmarkForUnwind. |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1094 |
unwindBlock value. |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1095 |
|
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1096 |
con := con findNextUnwindContextOr:self. |
328 | 1097 |
]. |
1098 |
||
1099 |
"oops, I am not on the calling chain |
|
1100 |
(should we check for this situation first and NOT evaluate |
|
1101 |
the unwind actions in this case ?) |
|
1102 |
" |
|
1103 |
con isNil ifTrue:[ |
|
1104 |
" |
|
1105 |
tried to return to a context which is already dead |
|
1106 |
(i.e. the method/block has already executed a return) |
|
1107 |
" |
|
379 | 1108 |
^ self invalidReturnOrRestartError:#unwind with:aBlock |
328 | 1109 |
]. |
1110 |
" |
|
1111 |
now, that all unwind-actions are done, I can use the |
|
1112 |
low-level return ... |
|
1113 |
" |
|
1114 |
^ self returnDoing:aBlock |
|
1 | 1115 |
! ! |
623 | 1116 |
|
1117 |
!Context methodsFor:'printing & storing'! |
|
1118 |
||
1070
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1119 |
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
|
1120 |
|
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1121 |
|name| |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1122 |
%{ |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1123 |
/* |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1124 |
* 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
|
1125 |
* 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
|
1126 |
* 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
|
1127 |
*/ |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1128 |
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
|
1129 |
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
|
1130 |
} |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1131 |
%}. |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1132 |
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
|
1133 |
^ 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
|
1134 |
! |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1135 |
|
623 | 1136 |
argsDisplayString |
1137 |
|fullString n "{ Class: SmallInteger }" | |
|
1138 |
||
1139 |
fullString := ''. |
|
1140 |
n := self numArgs. |
|
1141 |
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
|
1142 |
fullString := fullString , ' ' , (self argStringFor:(self at:index)) |
623 | 1143 |
]. |
1144 |
^ fullString |
|
1145 |
! |
|
1146 |
||
1147 |
displayString |
|
1148 |
"return a string describing the context - for display in Inspector" |
|
1149 |
||
1150 |
^ self class name , '(' , self printString , ')' |
|
1151 |
! |
|
1152 |
||
1153 |
fullPrintString |
|
1154 |
"return a string describing the context - this includes the linenumber, |
|
1155 |
receiver printString and argument printString" |
|
1156 |
||
1157 |
|s| |
|
1158 |
||
1159 |
s := WriteStream on:String new. |
|
1160 |
s nextPutAll:self receiverPrintString; space; nextPutAll:selector. |
|
1161 |
self size ~~ 0 ifTrue: [ |
|
1162 |
s space. |
|
1163 |
s nextPutAll:self argsDisplayString |
|
1164 |
]. |
|
1165 |
s nextPutAll:' ['; nextPutAll:self lineNumber printString; nextPutAll:']' . |
|
1166 |
^ s contents |
|
1167 |
||
1168 |
" |
|
1169 |
thisContext fullPrintString |
|
1170 |
" |
|
1171 |
! |
|
1172 |
||
1173 |
methodPrintString |
|
1174 |
"return a string describing the contexts method as 'implementorClass>>selector'" |
|
1175 |
||
1853
09cd1e8df9a2
use new Method>>who interface
Claus Gittinger <cg@exept.de>
parents:
1810
diff
changeset
|
1176 |
|mthd who| |
623 | 1177 |
|
1178 |
mthd := self method. |
|
1179 |
mthd notNil ifTrue:[ |
|
1853
09cd1e8df9a2
use new Method>>who interface
Claus Gittinger <cg@exept.de>
parents:
1810
diff
changeset
|
1180 |
who := mthd who. |
09cd1e8df9a2
use new Method>>who interface
Claus Gittinger <cg@exept.de>
parents:
1810
diff
changeset
|
1181 |
who notNil ifTrue:[ |
09cd1e8df9a2
use new Method>>who interface
Claus Gittinger <cg@exept.de>
parents:
1810
diff
changeset
|
1182 |
^ who methodClass name , '>>' , who methodSelector |
09cd1e8df9a2
use new Method>>who interface
Claus Gittinger <cg@exept.de>
parents:
1810
diff
changeset
|
1183 |
] |
623 | 1184 |
]. |
1185 |
^ mthd displayString. |
|
1186 |
||
1187 |
" |
|
1188 |
thisContext methodPrintString |
|
1189 |
thisContext sender methodPrintString |
|
1190 |
" |
|
1853
09cd1e8df9a2
use new Method>>who interface
Claus Gittinger <cg@exept.de>
parents:
1810
diff
changeset
|
1191 |
|
09cd1e8df9a2
use new Method>>who interface
Claus Gittinger <cg@exept.de>
parents:
1810
diff
changeset
|
1192 |
"Modified: 1.11.1996 / 16:21:49 / cg" |
623 | 1193 |
! |
1194 |
||
1195 |
printOn:aStream |
|
1196 |
"append a printed description of the receiver onto aStream" |
|
1197 |
||
1198 |
aStream nextPutAll:(self receiverPrintString). |
|
1199 |
aStream space. |
|
1200 |
self selector printOn:aStream |
|
1201 |
! |
|
1202 |
||
1203 |
printString |
|
1204 |
"return a string describing the context" |
|
1205 |
||
1206 |
^ self receiverPrintString , ' ' , self selector printString |
|
1207 |
! |
|
1208 |
||
1209 |
receiverPrintString |
|
1210 |
"return a string describing the receiver of the context" |
|
1211 |
||
1212 |
|receiverClass receiverClassName newString implementorClass| |
|
1213 |
||
1070
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1214 |
%{ |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1215 |
/* |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1216 |
* 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
|
1217 |
* 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
|
1218 |
* 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
|
1219 |
*/ |
1133 | 1220 |
if (__isNonNilObject(__INST(receiver)) && (__qClass(__INST(receiver))==nil)) { |
2157
436ad20004f4
prepare for #doIt: (with context)
Claus Gittinger <cg@exept.de>
parents:
2135
diff
changeset
|
1221 |
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
|
1222 |
} |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1223 |
%}. |
cf35b237612d
in argPrint: handle invalid objects (avoids crash in MiniDebugger when debugging bad primitives)
Claus Gittinger <cg@exept.de>
parents:
1051
diff
changeset
|
1224 |
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
|
1225 |
|
623 | 1226 |
receiverClass := receiver class. |
1227 |
receiverClassName := receiverClass name. |
|
1228 |
(receiverClass == SmallInteger) ifTrue:[ |
|
2157
436ad20004f4
prepare for #doIt: (with context)
Claus Gittinger <cg@exept.de>
parents:
2135
diff
changeset
|
1229 |
newString := '(' , receiver printString , ') ' , receiverClassName |
623 | 1230 |
] ifFalse:[ |
2157
436ad20004f4
prepare for #doIt: (with context)
Claus Gittinger <cg@exept.de>
parents:
2135
diff
changeset
|
1231 |
newString := receiverClassName |
623 | 1232 |
]. |
1233 |
||
1234 |
selector notNil ifTrue:[ |
|
1235 |
"/ implementorClass := self searchClass whichClassIncludesSelector:selector. |
|
1236 |
||
2157
436ad20004f4
prepare for #doIt: (with context)
Claus Gittinger <cg@exept.de>
parents:
2135
diff
changeset
|
1237 |
" |
436ad20004f4
prepare for #doIt: (with context)
Claus Gittinger <cg@exept.de>
parents:
2135
diff
changeset
|
1238 |
kludge to avoid slow search for containing class |
436ad20004f4
prepare for #doIt: (with context)
Claus Gittinger <cg@exept.de>
parents:
2135
diff
changeset
|
1239 |
" |
436ad20004f4
prepare for #doIt: (with context)
Claus Gittinger <cg@exept.de>
parents:
2135
diff
changeset
|
1240 |
(selector ~~ #doIt and:[selector ~~ #doIt:]) ifTrue:[ |
436ad20004f4
prepare for #doIt: (with context)
Claus Gittinger <cg@exept.de>
parents:
2135
diff
changeset
|
1241 |
implementorClass := self methodClass. |
436ad20004f4
prepare for #doIt: (with context)
Claus Gittinger <cg@exept.de>
parents:
2135
diff
changeset
|
1242 |
]. |
436ad20004f4
prepare for #doIt: (with context)
Claus Gittinger <cg@exept.de>
parents:
2135
diff
changeset
|
1243 |
implementorClass notNil ifTrue: [ |
436ad20004f4
prepare for #doIt: (with context)
Claus Gittinger <cg@exept.de>
parents:
2135
diff
changeset
|
1244 |
(implementorClass ~~ receiverClass) ifTrue: [ |
436ad20004f4
prepare for #doIt: (with context)
Claus Gittinger <cg@exept.de>
parents:
2135
diff
changeset
|
1245 |
newString := newString , '>>>', |
436ad20004f4
prepare for #doIt: (with context)
Claus Gittinger <cg@exept.de>
parents:
2135
diff
changeset
|
1246 |
implementorClass name printString |
436ad20004f4
prepare for #doIt: (with context)
Claus Gittinger <cg@exept.de>
parents:
2135
diff
changeset
|
1247 |
] |
436ad20004f4
prepare for #doIt: (with context)
Claus Gittinger <cg@exept.de>
parents:
2135
diff
changeset
|
1248 |
] ifFalse:[ |
436ad20004f4
prepare for #doIt: (with context)
Claus Gittinger <cg@exept.de>
parents:
2135
diff
changeset
|
1249 |
self searchClass ~~ receiverClass ifTrue:[ |
436ad20004f4
prepare for #doIt: (with context)
Claus Gittinger <cg@exept.de>
parents:
2135
diff
changeset
|
1250 |
newString := newString , '>>>' , self searchClass name |
436ad20004f4
prepare for #doIt: (with context)
Claus Gittinger <cg@exept.de>
parents:
2135
diff
changeset
|
1251 |
]. |
436ad20004f4
prepare for #doIt: (with context)
Claus Gittinger <cg@exept.de>
parents:
2135
diff
changeset
|
1252 |
" |
436ad20004f4
prepare for #doIt: (with context)
Claus Gittinger <cg@exept.de>
parents:
2135
diff
changeset
|
1253 |
kludge for doIt - these unbound methods are not |
436ad20004f4
prepare for #doIt: (with context)
Claus Gittinger <cg@exept.de>
parents:
2135
diff
changeset
|
1254 |
found in the classes methodDictionary |
436ad20004f4
prepare for #doIt: (with context)
Claus Gittinger <cg@exept.de>
parents:
2135
diff
changeset
|
1255 |
" |
436ad20004f4
prepare for #doIt: (with context)
Claus Gittinger <cg@exept.de>
parents:
2135
diff
changeset
|
1256 |
(selector ~~ #doIt and:[selector ~~ #doIt:]) ifTrue:[ |
436ad20004f4
prepare for #doIt: (with context)
Claus Gittinger <cg@exept.de>
parents:
2135
diff
changeset
|
1257 |
newString := newString , '>>>**NONE**' |
436ad20004f4
prepare for #doIt: (with context)
Claus Gittinger <cg@exept.de>
parents:
2135
diff
changeset
|
1258 |
] |
436ad20004f4
prepare for #doIt: (with context)
Claus Gittinger <cg@exept.de>
parents:
2135
diff
changeset
|
1259 |
] |
623 | 1260 |
]. |
1261 |
||
1262 |
^ newString |
|
1263 |
! ! |
|
1264 |
||
1265 |
!Context methodsFor:'private accessing'! |
|
1266 |
||
753
81d54fc53a18
added mechanism to force a stepInterrupt whenever a context returns or unwinds
Claus Gittinger <cg@exept.de>
parents:
749
diff
changeset
|
1267 |
markForInterrupt |
81d54fc53a18
added mechanism to force a stepInterrupt whenever a context returns or unwinds
Claus Gittinger <cg@exept.de>
parents:
749
diff
changeset
|
1268 |
"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
|
1269 |
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
|
1270 |
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
|
1271 |
|
81d54fc53a18
added mechanism to force a stepInterrupt whenever a context returns or unwinds
Claus Gittinger <cg@exept.de>
parents:
749
diff
changeset
|
1272 |
%{ /* NOCONTEXT */ |
81d54fc53a18
added mechanism to force a stepInterrupt whenever a context returns or unwinds
Claus Gittinger <cg@exept.de>
parents:
749
diff
changeset
|
1273 |
__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
|
1274 |
%} |
81d54fc53a18
added mechanism to force a stepInterrupt whenever a context returns or unwinds
Claus Gittinger <cg@exept.de>
parents:
749
diff
changeset
|
1275 |
! |
81d54fc53a18
added mechanism to force a stepInterrupt whenever a context returns or unwinds
Claus Gittinger <cg@exept.de>
parents:
749
diff
changeset
|
1276 |
|
1727 | 1277 |
markForInterruptOnUnwind |
1278 |
"set the interrupt-on-unwind flag in the receiver. |
|
1279 |
The VM will generate a stepInterrupt, when this context returns or |
|
1280 |
is unwound. This is used by the debugger for faster single-stepping; |
|
1281 |
- a highly internal mechanism and not for public use." |
|
1282 |
||
1283 |
%{ /* NOCONTEXT */ |
|
1284 |
__INST(flags) = (OBJ)((INT)__INST(flags) |
|
1285 |
| __MASKSMALLINT(__IRQ_ON_UNWIND)); |
|
1286 |
%} |
|
1287 |
! |
|
1288 |
||
623 | 1289 |
markForUnwind |
749 | 1290 |
"set the mark for unwind flag in the receiver. |
1291 |
The VM needs this to know that some special action is to be performed with |
|
1292 |
this context - a highly internal mechanism and not for public use." |
|
1293 |
||
623 | 1294 |
%{ /* NOCONTEXT */ |
1133 | 1295 |
__INST(flags) = (OBJ)((INT)__INST(flags) | __MASKSMALLINT(__UNWIND_MARK)); |
623 | 1296 |
%} |
749 | 1297 |
|
1298 |
"Modified: 13.12.1995 / 19:05:22 / cg" |
|
623 | 1299 |
! |
1300 |
||
1301 |
unmarkForUnwind |
|
749 | 1302 |
"clear the mark for unwind flag in the receiver. |
1303 |
The VM needs this to know that some special action is to be performed with |
|
1304 |
this context - a highly internal mechanism and not for public use." |
|
1305 |
||
623 | 1306 |
%{ /* NOCONTEXT */ |
1133 | 1307 |
__INST(flags) = (OBJ)((INT)__INST(flags) & ~__MASKSMALLINT(__UNWIND_MARK)); |
623 | 1308 |
%} |
1309 |
! ! |
|
1310 |
||
1051 | 1311 |
!Context methodsFor:'special accessing'! |
1312 |
||
1313 |
canReturn |
|
1314 |
"return true, if the receiver allows returning through it. |
|
1315 |
For normal method contexts, this returns true; |
|
1316 |
for blocks, it (currently) always returns false. |
|
1317 |
||
1318 |
However, the system can be compiled (for production code), to create |
|
1319 |
contexts which cannot be returned or restarted |
|
1320 |
(except, if the method contains a returning block). |
|
1321 |
This saves some administrative work in every method |
|
1322 |
invocation and makes overall execution faster. However, it limits |
|
1323 |
the debugger, in that it cannot return from or restart those contexts. |
|
1324 |
(unwinding and termination is not affected by this optimization) |
|
1325 |
Currently, the system as delivered has this optimization disabled." |
|
1326 |
||
1327 |
%{ /* NOCONTEXT */ |
|
1328 |
||
1133 | 1329 |
RETURN ( (__intVal(__INST(flags)) & __CANNOT_RETURN) ? false : true ); |
1051 | 1330 |
%} |
1331 |
! |
|
1332 |
||
1492 | 1333 |
hasStackToShow |
1334 |
^ false |
|
1335 |
||
1336 |
"Created: 28.6.1996 / 14:48:39 / cg" |
|
1337 |
! |
|
1338 |
||
1051 | 1339 |
isNonLifo |
1340 |
"return true, if this is a nonLifo context" |
|
1341 |
||
1342 |
%{ /* NOCONTEXT */ |
|
1133 | 1343 |
RETURN ( ((INT)__INST(flags) & __MASKSMALLINT(__NONLIFO)) ? true : false ); |
1051 | 1344 |
%} |
1345 |
! |
|
1346 |
||
1347 |
isOnMachineStack |
|
1348 |
"return true, if this is a machine stack context as opposed to a |
|
1349 |
real heap context" |
|
1350 |
||
1351 |
%{ /* NOCONTEXT */ |
|
1352 |
RETURN ( (__qSpace(self) >= STACKSPACE) ? true : false ); |
|
1353 |
%} |
|
1354 |
! |
|
1355 |
||
1356 |
isSpecial |
|
1357 |
"return true, if this is either a nonLifo or interrupted context" |
|
1358 |
||
1359 |
%{ /* NOCONTEXT */ |
|
1133 | 1360 |
RETURN ( ((INT)__INST(flags) & __MASKSMALLINT(__SPECIAL)) ? true : false ); |
1051 | 1361 |
%} |
1362 |
! |
|
1363 |
||
1364 |
isUnwindContext |
|
1365 |
"return true, if this is an unwindContext" |
|
1366 |
||
1367 |
%{ /* NOCONTEXT */ |
|
1133 | 1368 |
RETURN ( ((INT)__INST(flags) & __MASKSMALLINT(__UNWIND_MARK)) ? true : false ); |
1051 | 1369 |
%} |
1370 |
! ! |
|
1371 |
||
623 | 1372 |
!Context methodsFor:'testing'! |
1373 |
||
1374 |
isBlockContext |
|
1375 |
"return true, iff the receiver is a BlockContext, false otherwise" |
|
1376 |
||
1377 |
^ false |
|
1378 |
! |
|
1379 |
||
1380 |
isContext |
|
1381 |
"return true, iff the receiver is a Context, false otherwise" |
|
1382 |
||
1383 |
^ true |
|
1384 |
! |
|
1385 |
||
1386 |
isRecursive |
|
1387 |
"return true, if this context is one of a recursive send of the same |
|
1483 | 1388 |
selector to the same receiver before. |
1389 |
Here, different arguments are ignored - i.e. only the same method |
|
1390 |
counts for recursiveness. |
|
623 | 1391 |
Used to detect recursive errors or recursive printing - for example." |
1392 |
||
2291
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1393 |
|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
|
1394 |
|
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1395 |
count := 0. |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1396 |
|
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1397 |
c := self findNextContextWithSelector:selector or:nil. |
623 | 1398 |
[c notNil] whileTrue:[ |
2291
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1399 |
(c receiver == receiver) ifTrue:[ |
1483 | 1400 |
" |
1401 |
stupid: the current ST/X context does not include |
|
1402 |
the method, but the class, in which the search started ... |
|
1403 |
" |
|
2291
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1404 |
myMethodsClass isNil ifTrue:[ |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1405 |
myMethodsClass := self methodClass. |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1406 |
]. |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1407 |
c methodClass == myMethodsClass ifTrue:[ |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1408 |
^ true |
1483 | 1409 |
] |
1410 |
]. |
|
2291
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1411 |
c := c findNextContextWithSelector:selector or:nil. |
2135
6bd144c1c358
newStyle info & error messages
Claus Gittinger <cg@exept.de>
parents:
1853
diff
changeset
|
1412 |
|
1483 | 1413 |
" |
1414 |
this special test was added to get out after a while |
|
1415 |
if the sender chain is corrupt - this gives us at least |
|
1416 |
a chance to find those errors. |
|
1417 |
" |
|
2291
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1418 |
count := count + 1. |
af7652b82404
avoid touching contexts (making them nonLifo) when searching for unwind-contexts,
Claus Gittinger <cg@exept.de>
parents:
2285
diff
changeset
|
1419 |
count >= 100000 ifTrue:[ |
2135
6bd144c1c358
newStyle info & error messages
Claus Gittinger <cg@exept.de>
parents:
1853
diff
changeset
|
1420 |
'Context [warning]: bad context chain' errorPrintCR. |
1483 | 1421 |
^ true |
1422 |
] |
|
623 | 1423 |
]. |
1424 |
^ false |
|
1483 | 1425 |
|
2135
6bd144c1c358
newStyle info & error messages
Claus Gittinger <cg@exept.de>
parents:
1853
diff
changeset
|
1426 |
"Modified: 10.1.1997 / 17:34:26 / cg" |
623 | 1427 |
! ! |
1428 |
||
1810 | 1429 |
!Context class methodsFor:'documentation'! |
749 | 1430 |
|
1431 |
version |
|
2510
393a51424d60
avoid marking context as nonLifo (in unwind:)
Claus Gittinger <cg@exept.de>
parents:
2368
diff
changeset
|
1432 |
^ '$Header: /cvs/stx/stx/libbasic/Context.st,v 1.78 1997-03-27 15:48:47 cg Exp $' |
749 | 1433 |
! ! |
623 | 1434 |
Context initialize! |