"
 COPYRIGHT (c) 1989-93 by Claus Gittinger
              All Rights Reserved

 This software is furnished under a license and may be used
 only in accordance with the terms of that license and with the
 inclusion of the above copyright notice.   This software may not
 be provided or otherwise made available to, or used by, any
 other person.  No title to or ownership of the software is
 hereby transferred.
"

StatementNode subclass:#ReturnNode
       instanceVariableNames:'myHome blockHome'
       classVariableNames:''
       poolDictionaries:''
       category:'System-Compiler-Support'
!

ReturnNode comment:'
COPYRIGHT (c) 1989-93 by Claus Gittinger
              All Rights Reserved

$Header: /cvs/stx/stx/libcomp/ReturnNode.st,v 1.2 1993-10-13 00:26:13 claus Exp $
'!

!ReturnNode methodsFor:'accessing'!

home:someOne blockHome:aBlockNode
    myHome := someOne.
    blockHome := aBlockNode
! !

!ReturnNode methodsFor:'evaluating'!

evaluateExpression
    |val|

    val := expression evaluate.
    myHome exitWith:val.
    "when we arrive here, the parser context is already gone
     - try block-return"
    blockHome notNil ifTrue:[blockHome exitWith:val].
    "well - what else can be done"
    ^ val
! !

!ReturnNode methodsFor:'code generation'!

codeForSideEffectOn:aStream inBlock:b
    "redefined - drop not needed since notreached"

    ^ self codeOn:aStream inBlock:b
!

codeOn:aStream inBlock:b
    |type value index|

    (expression isKindOf:PrimaryNode) ifTrue:[
        type := expression type.
        (type == #Nil) ifTrue:[
            aStream nextPut:#retNil. ^ self
        ].
        (type == #True) ifTrue:[
            aStream nextPut:#retTrue. ^ self
        ].
        (type == #False) ifTrue:[
            aStream nextPut:#retFalse. ^ self
        ].
        (type == #Self) ifTrue:[
            aStream nextPut:#retSelf. ^ self
        ].
        (type == #Integer) ifTrue:[
            value := expression evaluate.
            (value between: -128 and:127) ifTrue:[
                (value == 0) ifTrue:[
                    aStream nextPut:#ret0. ^ self
                ].
                aStream nextPut:#retNum.
                aStream nextPut:value. ^ self
            ]
        ].
        (type == #InstanceVariable) ifTrue:[
            index := expression index.
            (index <= 8) ifTrue:[
                aStream nextPut:(#(retInstVar1
                                   retInstVar2
                                   retInstVar3
                                   retInstVar4
                                   retInstVar5
                                   retInstVar6
                                   retInstVar7
                                   retInstVar8) at:index). ^ self
            ]
        ].
        (type == #MethodVariable) ifTrue:[
            index := expression index.
            (index <= 6) ifTrue:[
                aStream nextPut:(#(retMethodVar1
                                   retMethodVar2
                                   retMethodVar3
                                   retMethodVar4
                                   retMethodVar5
                                   retMethodVar6) at:index). ^ self
            ]
        ].
        (type == #MethodArg) ifTrue:[
            index := expression index.
            (index <= 2) ifTrue:[
                aStream nextPut:(#(retMethodArg1
                                   retMethodArg2) at:index). ^ self
            ]
        ]
    ].
    expression codeOn:aStream inBlock:b.
    aStream nextPut:#retTop
! !

!ReturnNode methodsFor:'printing'!

printOn:aStream indent:i
    aStream nextPutAll:'^ '.
    expression printOn:aStream
! !