"{ Encoding: utf8 }"

"

 COPYRIGHT (c) 1994 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.

"

"{ Package: 'stx:libcomp' }"

"{ NameSpace: Smalltalk }"

PrimaryNode subclass:#SelfNode

	instanceVariableNames:''

	classVariableNames:''

	poolDictionaries:''

	category:'System-Compiler-Support'

!

!SelfNode class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1994 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.

"

!

documentation

"

    node for parse-trees, representing self

    This is a helper class for the compiler.

    [author:]

        Claus Gittinger

"

! !

!SelfNode class methodsFor:'instance creation'!

value:val

    ^ (self basicNew) value:val

! !

!SelfNode methodsFor:'accessing'!

name

    ^ 'self'

    "Created: 19.6.1997 / 17:20:22 / cg"

!

value:val

    type := #Self.

    value := val.

! !

!SelfNode methodsFor:'code generation'!

codeForSideEffectOn:aStream inBlock:b for:aCompiler

    "no code at all"

    aCompiler 

        warning:'Useless reference to this'

        position:startPosition to:endPosition.    

    ^ self

!

codeForSimpleReturnOn:aStream inBlock:b lineNumber:lineNrOrNil for:aCompiler

    lineNrOrNil notNil ifTrue:[

        self codeLineNumber:lineNrOrNil on:aStream for:aCompiler

    ].

    aStream nextPut:#retSelf

!

codeOn:aStream inBlock:codeBlock for:aCompiler

    aStream nextPut:#pushSelf

!

codeStoreOn:aStream inBlock:codeBlock valueNeeded:valueNeeded for:aCompiler

    "not reached - parser has already checked this"

    ^ self error:'store into self - cannot happen'

! !

!SelfNode methodsFor:'enumerating'!

nodeDo:anEnumerator

    "helper for parse tree walking"

    ^ anEnumerator doVariable:self name:'self'

    "Created: 19.6.1997 / 17:20:02 / cg"

! !

!SelfNode methodsFor:'evaluation'!

evaluateIn:anEnvironment

    anEnvironment notNil ifTrue:[

        ^ anEnvironment receiver.

    ].

    ^ value

!

store:aValue

    "not reached - parser has already checked this"

    self error:'store into self - cannot happen'

! !

!SelfNode methodsFor:'printing & storing'!

displayOn:aGCOrStream

    "Compatibility

     append a printed desription on some stream (Dolphin,  Squeak)

     OR:

     display the receiver in a graphicsContext at 0@0 (ST80).

     This method allows for any object to be displayed in some view

     (although the fallBack is to display its printString ...)"

    "/ what a kludge - Dolphin and Squeak mean: printOn: a stream;

    "/ old ST80 means: draw-yourself on a GC.

    aGCOrStream isStream ifFalse:[

        ^ super displayOn:aGCOrStream.

    ].

    aGCOrStream 

        nextPutAll:'InterpreterVariable(self)'.

    "Modified (comment): / 22-02-2017 / 16:50:05 / cg"

!

printOn:aStream indent:i

    aStream nextPutAll:'self'

! !

!SelfNode methodsFor:'testing'!

isSelf

    "return true, if this is a self-node"

    ^ self class == SelfNode

! !

!SelfNode methodsFor:'visiting'!

acceptVisitor:aVisitor 

    "Double dispatch back to the visitor, passing my type encoded in

     the selector (visitor pattern)"

    "stub code automatically generated - please change if required"

    ^ aVisitor visitSelfNode:self

! !

!SelfNode class methodsFor:'documentation'!

version

    ^ '$Header$'

!

version_CVS

    ^ '$Header$'

! !