author | Claus Gittinger <cg@exept.de> |
Tue, 16 Apr 1996 16:40:00 +0200 | |
changeset 1190 | 4ad1c8d6d94d |
parent 1180 | 7f4a68385ac7 |
child 1195 | 618e2cf3fb56 |
permissions | -rw-r--r-- |
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" |
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COPYRIGHT (c) 1994 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 subclass:#ExecutableFunction |
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instanceVariableNames:'code*' |
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classVariableNames:'ExecutionErrorSignal InvalidCodeSignal' |
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poolDictionaries:'' |
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category:'Kernel-Methods' |
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! |
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!ExecutableFunction class methodsFor:'documentation'! |
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copyright |
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" |
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COPYRIGHT (c) 1994 by Claus Gittinger |
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All Rights Reserved |
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This software is furnished under a license and may be used |
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only in accordance with the terms of that license and with the |
|
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inclusion of the above copyright notice. This software may not |
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be provided or otherwise made available to, or used by, any |
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other person. No title to or ownership of the software is |
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hereby transferred. |
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" |
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! |
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documentation |
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" |
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This is an abstract class, to merge common attributes of all kinds of |
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executable code objects; i.e. non-ST functions, Blocks and Methods |
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and whatever there might be in the future. |
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Instance variables: |
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code <not_an_object> the function pointer to the machine code. |
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Not accessable from smalltalk code. |
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(notice the '*' in the instVarNames definition) |
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Class variables: |
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ExecutionErrorSignal parent of all execution errors |
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(not raised itself) |
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InvalidCodeSignal codeObject is not executable |
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NOTICE: layout known by runtime system and compiler - do not change |
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" |
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! ! |
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!ExecutableFunction class methodsFor:'initialization'! |
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initialize |
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InvalidCodeSignal isNil ifTrue:[ |
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ExecutionErrorSignal := ErrorSignal newSignalMayProceed:true. |
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ExecutionErrorSignal nameClass:self message:#executionErrorSignal. |
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ExecutionErrorSignal notifierString:'execution error'. |
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InvalidCodeSignal := ExecutionErrorSignal newSignalMayProceed:true. |
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InvalidCodeSignal nameClass:self message:#invalidCodeSignal. |
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InvalidCodeSignal notifierString:'invalid code-object - not executable'. |
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] |
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! ! |
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!ExecutableFunction class methodsFor:'Signal constants'! |
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executionErrorSignal |
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"return the parent-signal of all execution errors" |
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^ ExecutionErrorSignal |
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! ! |
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!ExecutableFunction class methodsFor:'queries'! |
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isBuiltInClass |
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"this class is known by the run-time-system" |
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^ self == CompiledCode |
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"Modified: 16.4.1996 / 11:25:49 / cg" |
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! ! |
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!ExecutableFunction methodsFor:'accessing'! |
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code |
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"return the code field. This is not an object but the address of the machine instructions. |
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Therefore an integer representing the code-address is returned" |
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%{ /* NOCONTEXT */ |
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unsigned addr; |
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if (__INST(code_) != nil) { |
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addr = (int)__INST(code_); |
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if (addr <= _MAX_INT) { |
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RETURN ( __MKSMALLINT(addr) ); |
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} |
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RETURN ( __MKUINT(addr)); |
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} |
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%}. |
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^ nil |
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! |
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instVarAt:index |
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"have to catch instVar access to code - since its no object" |
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(index == 1) ifTrue:[^ self code]. |
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^ super instVarAt:index |
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! |
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instVarAt:index put:value |
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"have to catch instVar access to code - since its no object" |
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(index == 1) ifTrue:[^ self code:value]. |
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^ super instVarAt:index put:value |
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! ! |
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!ExecutableFunction methodsFor:'binary storage'! |
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readBinaryContentsFrom: stream manager: manager |
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"make certain, that no invalid function addresses are created." |
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super readBinaryContentsFrom: stream manager: manager. |
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self code:nil. |
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! ! |
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!ExecutableFunction methodsFor:'error handling'! |
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invalidCode |
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"this error is triggered by the interpreter when something is wrong |
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with the code object (any error not handled by Method-signals). |
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In this case, the VM sends this to the bad method/block (the receiver). |
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Can only happen when the Compiler/runtime system is broken or |
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someone played around." |
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^ InvalidCodeSignal raise. |
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! ! |
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!ExecutableFunction methodsFor:'printing & storing'! |
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printOn:aStream |
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|addr| |
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addr := self code. |
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addr isNil ifTrue:[^ super printOn:aStream]. |
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aStream nextPutAll:self class name; nextPutAll:'(address: 0x'; |
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nextPutAll:(addr printStringRadix:16); nextPutAll:')' |
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! ! |
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!ExecutableFunction methodsFor:'private accessing'! |
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code:anAddress |
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"set the code field - DANGER ALERT. |
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This is not an object but the address of the machine instructions. |
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Therefore the argument must be an integer representing this address. |
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You can crash Smalltalk very badly when playing around here ... |
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This method is for compiler support and very special cases (debugging) only |
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- do not use" |
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%{ /* NOCONTEXT */ |
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if (__isSmallInteger(anAddress)) |
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__INST(code_) = (OBJ)(__intVal(anAddress)); |
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else { |
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__INST(code_) = (OBJ)(__longIntVal(anAddress)); |
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} |
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%} |
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! ! |
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!ExecutableFunction methodsFor:'queries'! |
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category |
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"return the category of this codeObject. |
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Return nil here, to alow alien codeObjects to be handled by the |
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browsers." |
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^ nil |
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"Created: 16.4.1996 / 16:31:15 / cg" |
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! |
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isInvalid |
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"return true, if this codeObject is invalidated. |
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Return false here, to alow alien codeObjects to be handled by the |
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browsers." |
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^ false |
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"Created: 16.4.1996 / 16:31:42 / cg" |
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! |
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isLazyMethod |
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"return true, if this is a lazy method. |
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False is returned here - this method is redefined in LazyMethod" |
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^ false |
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"Created: 16.4.1996 / 16:32:11 / cg" |
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"Modified: 16.4.1996 / 16:32:36 / cg" |
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! |
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isWrapped |
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"return true, if this is a wrapper method. |
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False is returned here - this method is redefined in WrappedMethod" |
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215 |
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216 |
^ false |
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"Created: 16.4.1996 / 16:33:24 / cg" |
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219 |
! |
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221 |
privacy |
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"return a symbol describing the methods access rights (privacy); |
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Currently, this is one of #private, #protected, #public or #ignored. |
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224 |
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225 |
Here we unconditionally return #public, to allow alien code objects |
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226 |
to be handled by the browsers." |
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^ #public |
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"Created: 16.4.1996 / 16:35:18 / cg" |
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! |
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233 |
referencesGlobal:aGlobalSymbol |
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"return true, if this method references the global |
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235 |
bound to aGlobalSymbol. |
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Return false (we dont know) here, to allow alien code objects to be |
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handled by the browsers." |
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^ false |
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"Created: 16.4.1996 / 16:37:48 / cg" |
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! |
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sends:aSelectorSymbol |
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"return true, if this method contains a message-send |
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with aSelectorSymbol as selector. |
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- due to the simple check in the literal array, also simple uses |
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of aSelectorSymbol as symbol will return true. |
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Should ask compiler, if there is really a send." |
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|
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^ self referencesGlobal:aSelectorSymbol |
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|
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"Created: 16.4.1996 / 16:35:53 / cg" |
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! ! |
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|
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!ExecutableFunction class methodsFor:'documentation'! |
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|
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version |
1190
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^ '$Header: /cvs/stx/stx/libbasic/ExecutableFunction.st,v 1.22 1996-04-16 14:39:07 cg Exp $' |
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! ! |
623 | 261 |
ExecutableFunction initialize! |