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"
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COPYRIGHT (c) 1989 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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ParseNode subclass:#AssignmentNode
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instanceVariableNames:'variable expression'
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classVariableNames:''
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poolDictionaries:''
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category:'System-Compiler-Support'
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!
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!AssignmentNode class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 1989 by Claus Gittinger
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All Rights Reserved
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20
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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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node for parse-trees, representing assignments
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"
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! !
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!AssignmentNode class methodsFor:'instance creation'!
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variable:v expression:e
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^ (self basicNew) variable:v expression:e
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! !
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!AssignmentNode methodsFor:'accessing'!
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expression
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^ expression
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!
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variable:v expression:e
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variable := v.
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expression := e
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! !
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!AssignmentNode methodsFor:'code generation'!
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checkIncDecOn:aStream
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|sel erec arg code|
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(variable type == #MethodVariable) ifTrue:[
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expression isBinaryMessage ifTrue:[
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sel := expression selector.
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erec := expression receiver.
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((sel == #+) or:[sel == #-]) ifTrue:[
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(erec type == #MethodVariable) ifTrue:[
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(erec index == variable index) ifTrue:[
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arg := expression arg1.
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arg isConstant ifTrue:[
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(arg value == 1) ifTrue:[
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(sel == #+) ifTrue:[
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code := #incMethodVar
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] ifFalse:[
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code := #decMethodVar
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].
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aStream nextPut:code; nextPut:(expression lineNumber); nextPut:(variable index).
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^ true
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]
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]
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]
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]
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]
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]
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].
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^ false
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!
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codeForSideEffectOn:aStream inBlock:b for:aCompiler
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(self checkIncDecOn:aStream) ifTrue:[^ self].
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expression codeOn:aStream inBlock:b for:aCompiler.
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variable codeStoreOn:aStream inBlock:b valueNeeded:false for:aCompiler
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"Modified: 4.9.1995 / 14:38:10 / claus"
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!
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codeOn:aStream inBlock:b for:aCompiler
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(self checkIncDecOn:aStream) ifTrue:[
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expression receiver codeOn:aStream inBlock:b for:aCompiler.
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^ self
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].
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expression codeOn:aStream inBlock:b for:aCompiler.
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variable codeStoreOn:aStream inBlock:b valueNeeded:true for:aCompiler
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! !
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!AssignmentNode methodsFor:'evaluating'!
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evaluate
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|value|
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value := expression evaluate.
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variable store:value.
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^ value
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! !
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!AssignmentNode methodsFor:'printing'!
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printOn:aStream indent:i
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variable printOn:aStream.
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aStream nextPutAll:' := '.
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expression printOn:aStream
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! !
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140
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!AssignmentNode methodsFor:'queries'!
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isAssignment
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"return true, if this is a node for an assignment"
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^ true
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! !
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148
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!AssignmentNode class methodsFor:'documentation'!
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version
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^ '$Header: /cvs/stx/stx/libcomp/AssignmentNode.st,v 1.15 1995-12-03 12:15:55 cg Exp $'
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! !
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