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"
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COPYRIGHT (c) 1989 by Claus Gittinger
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62
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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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StatementNode subclass:#ReturnNode
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instanceVariableNames:'myHome blockHome'
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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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!ReturnNode 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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62
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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 return expressions
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"
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140
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!
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version
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^ '$Header: /cvs/stx/stx/libcomp/Attic/RetNode.st,v 1.13 1995-11-23 02:14:34 cg Exp $'
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! !
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!ReturnNode methodsFor:'accessing'!
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home:someOne blockHome:aBlockNode
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myHome := someOne.
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blockHome := aBlockNode
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! !
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!ReturnNode methodsFor:'code generation'!
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104
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codeForSideEffectOn:aStream inBlock:b for:aCompiler
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"redefined - drop not needed since notreached"
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^ self codeOn:aStream inBlock:b for:aCompiler
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!
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codeOn:aStream inBlock:b for:aCompiler
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|type value index|
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"/ after 2.10
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b notNil ifTrue:[
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expression codeOn:aStream inBlock:b for:aCompiler.
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aStream nextPut:#homeRetTop.
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^ self
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].
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expression isPrimary ifTrue:[
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type := expression type.
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(type == #Nil) ifTrue:[
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aStream nextPut:#retNil. ^ self
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].
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(type == #True) ifTrue:[
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aStream nextPut:#retTrue. ^ self
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].
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(type == #False) ifTrue:[
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aStream nextPut:#retFalse. ^ self
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].
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(type == #Self) ifTrue:[
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aStream nextPut:#retSelf. ^ self
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].
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(type == #Integer) ifTrue:[
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value := expression evaluate.
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(value between: -128 and:127) ifTrue:[
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(value == 0) ifTrue:[
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aStream nextPut:#ret0. ^ self
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].
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aStream nextPut:#retNum.
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aStream nextPut:value. ^ self
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]
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].
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(type == #InstanceVariable) ifTrue:[
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index := expression index.
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(index <= 8) ifTrue:[
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aStream nextPut:(#(retInstVar1
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retInstVar2
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retInstVar3
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retInstVar4
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retInstVar5
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retInstVar6
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retInstVar7
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retInstVar8) at:index). ^ self
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]
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].
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(type == #MethodVariable) ifTrue:[
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index := expression index.
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(index <= 6) ifTrue:[
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aStream nextPut:(#(retMethodVar1
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retMethodVar2
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retMethodVar3
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retMethodVar4
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retMethodVar5
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retMethodVar6) at:index). ^ self
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]
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].
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(type == #MethodArg) ifTrue:[
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index := expression index.
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(index <= 2) ifTrue:[
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aStream nextPut:(#(retMethodArg1
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retMethodArg2) at:index). ^ self
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]
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]
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0
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].
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104
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expression codeOn:aStream inBlock:b for:aCompiler.
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0
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aStream nextPut:#retTop
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! !
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140
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!ReturnNode methodsFor:'evaluating'!
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evaluateExpression
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|val|
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val := expression evaluate.
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myHome exitWith:val.
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"when we arrive here, the parser context is already gone
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- try block-return"
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blockHome notNil ifTrue:[blockHome exitWith:val].
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"well - what else can be done"
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^ val
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! !
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144 |
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0
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145 |
!ReturnNode methodsFor:'printing'!
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printOn:aStream indent:i
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aStream nextPutAll:'^ '.
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149 |
expression printOn:aStream
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! !
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140
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151 |
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152 |
!ReturnNode methodsFor:'queries'!
|
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153 |
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154 |
isConstant
|
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^ false
|
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156 |
!
|
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157 |
|
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158 |
isReturnNode
|
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|
159 |
^ true
|
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160 |
! !
|
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161 |
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