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"
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COPYRIGHT (c) 1993 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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Context subclass:#BlockContext
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instanceVariableNames:'' "do not add instvars here"
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classVariableNames:''
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poolDictionaries:''
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category:'Kernel-Methods'
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!
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BlockContext comment:'
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88
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COPYRIGHT (c) 1993 by Claus Gittinger
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165
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All Rights Reserved
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92
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$Header: /cvs/stx/stx/libbasic/BlockContext.st,v 1.9 1994-10-28 01:19:07 claus Exp $
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'!
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1
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!BlockContext class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 1993 by Claus Gittinger
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165
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All Rights Reserved
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1
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88
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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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1
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88
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version
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"
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$Header: /cvs/stx/stx/libbasic/BlockContext.st,v 1.9 1994-10-28 01:19:07 claus Exp $
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"
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!
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1
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documentation
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"
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BlockContexts represent the stack context objects of blocks.
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The layout is the same as for other contexts - this class has been added
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to avoid a flag in an instance variable.
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(has become necessary with cheap blocks, which have no home).
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WARNING: layout and size known by compiler and runtime system -
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do not change.
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"
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! !
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!BlockContext methodsFor:'accessing'!
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isBlockContext
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"return true, iff the receiver is a BlockContext, false otherwise"
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^ true
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!
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methodHome
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"return the method-home for block contexts"
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|con h|
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home isNil ifTrue:[^ nil]. "XXX will change soon"
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home isContext ifFalse:[^ nil]. "copying blocks have no method home"
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con := self.
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h := home.
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[h notNil] whileTrue:[
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con := h.
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h := con home
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1
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].
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^ con
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!
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home
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"return the immediate home of the receiver.
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normally this is the methodcontext, where the block was created,
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for nested block contexts, this is the surrounding blocks context."
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home isContext ifFalse:[^ nil]. "copying blocks have no home"
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^ home
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!
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selector
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"return the selector of the context - which is one of the value
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selectors"
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|nargs|
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nargs := self numArgs.
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(nargs == 0) ifTrue:[^ #value].
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(nargs == 1) ifTrue:[^ #value:].
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(nargs == 2) ifTrue:[^ #value:value:].
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(nargs == 3) ifTrue:[^ #value:value:value:].
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(nargs == 4) ifTrue:[^ #value:value:value:value:].
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(nargs == 5) ifTrue:[^ #value:value:value:value:value:].
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^ nil
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! !
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!BlockContext methodsFor:'printing & storing'!
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receiverPrintString
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home isNil ifTrue:[
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^ '[] optimized'
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].
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home isContext ifFalse:[
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"a copying block"
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1
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"receiverClassName := home selfValue class name."
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^ '[] optimized'
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].
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^ '[] in ' , receiver class name , '-' , self methodHome selector printString
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!
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printReceiver
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"print the contexts receiver on the standard output"
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self receiverPrintString print
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!
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printString
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"return a string describing the context"
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^ self receiverPrintString , ' ' , self selector printString
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! !
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