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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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PrimaryNode subclass:#ConstantNode
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instanceVariableNames:''
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classVariableNames:'TrueNode FalseNode NilNode Const0Node Const1Node
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Float0Node'
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poolDictionaries:''
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category:'System-Compiler-Support'
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!
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ConstantNode comment:'
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COPYRIGHT (c) 1989 by Claus Gittinger
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All Rights Reserved
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$Header: /cvs/stx/stx/libcomp/Attic/ConstNode.st,v 1.5 1994-01-08 17:05:08 claus Exp $
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'!
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!ConstantNode class methodsFor:'queries'!
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typeOfConstant:anObject
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anObject isNumber ifTrue:[
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(anObject isKindOf:SmallInteger) ifTrue:[
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^ #Integer
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].
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(anObject isKindOf:Float) ifTrue:[
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^ #Float
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].
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0
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].
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anObject isNil ifTrue:[
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^ #Nil
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].
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(anObject == true) ifTrue:[
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^ #True
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].
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(anObject == false) ifTrue:[
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^ #False
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].
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^ #Literal
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! !
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!ConstantNode class methodsFor:'instance creation'!
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type:t value:val
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"some constant nodes are use so often, its worth caching them"
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(t == #True) ifTrue:[
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TrueNode isNil ifTrue:[
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TrueNode := super type:t value:val
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].
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^ TrueNode
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].
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(t == #False) ifTrue:[
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FalseNode isNil ifTrue:[
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FalseNode := super type:t value:val
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].
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^ FalseNode
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].
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(t == #Nil) ifTrue:[
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NilNode isNil ifTrue:[
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NilNode := super type:t value:val
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].
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^ NilNode
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].
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(t == #Integer) ifTrue:[
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(val == 0) ifTrue:[
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Const0Node isNil ifTrue:[
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Const0Node := super type:t value:val
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].
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^ Const0Node
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].
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(val == 1) ifTrue:[
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Const1Node isNil ifTrue:[
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Const1Node := super type:t value:val
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].
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^ Const1Node
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]
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].
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(t == #Float) ifTrue:[
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(val = 0.0) ifTrue:[
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Float0Node isNil ifTrue:[
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Float0Node := super type:t value:val
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0
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].
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^ Float0Node
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]
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].
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^ (self basicNew) type:t value:val
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! !
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!ConstantNode methodsFor:'queries'!
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isConstant
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^ true
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! !
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!ConstantNode methodsFor:'evaluating'!
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evaluate
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^ value
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!
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store:aValue
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self error:'store not allowed'.
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^ aValue
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! !
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!ConstantNode methodsFor:'code generation'!
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codeOn:aStream inBlock:b
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"generated code for the constant"
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(type == #Integer) ifTrue:[
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(value between: -128 and:127) ifTrue:[
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(value == 0) ifTrue:[
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aStream nextPut:#push0. ^ self
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].
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(value == 1) ifTrue:[
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aStream nextPut:#push1. ^ self
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].
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3
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(value == 2) ifTrue:[
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aStream nextPut:#push2. ^ self
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].
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0
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(value == -1) ifTrue:[
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aStream nextPut:#pushMinus1. ^ self
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].
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aStream nextPut:#pushNum.
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aStream nextPut:value.
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^ self
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]
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].
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(type == #Nil) ifTrue:[
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aStream nextPut:#pushNil. ^ self
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].
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(type == #True) ifTrue:[
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aStream nextPut:#pushTrue. ^ self
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].
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(type == #False) ifTrue:[
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aStream nextPut:#pushFalse. ^ self
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].
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aStream nextPut:#pushLit.
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aStream nextPut:value
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!
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codeStoreOn:aStream
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"should never be sent"
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^ self error:'assignment to literals not allowed'
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! !
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!ConstantNode methodsFor:'printing'!
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printOn:aStream indent:i
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value storeOn:aStream
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! !
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