author | Claus Gittinger <cg@exept.de> |
Thu, 31 Aug 2000 12:03:58 +0200 | |
changeset 1080 | bd3f19f6009a |
parent 1035 | 8848672cb893 |
child 1209 | 4646067249e8 |
permissions | -rw-r--r-- |
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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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"{ Package: 'stx:libcomp' }" |
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ParseNode subclass:#StatementNode |
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instanceVariableNames:'expression nextStatement lineNr' |
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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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!StatementNode 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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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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||
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documentation |
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" |
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node for parse-trees, representing statements |
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This is a helper class for the compiler. |
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[author:] |
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Claus Gittinger |
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" |
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! ! |
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!StatementNode class methodsFor:'instance creation'! |
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expression:e |
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^ (self basicNew) expression:e |
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! ! |
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!StatementNode methodsFor:'accessing'! |
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expression |
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^ expression |
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! |
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expression:e |
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expression := e |
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! |
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last |
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"return the last statement in a list" |
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|last this| |
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"this could be done more elegant - but with lots of recursion" |
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last := self. |
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this := self. |
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[this notNil] whileTrue:[ |
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last := this. |
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this := this nextStatement |
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]. |
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^ last |
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! |
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lineNumber |
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"return lineNr" |
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^ lineNr |
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"Created: / 14.5.1998 / 19:31:06 / cg" |
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! |
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lineNumber:something |
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"set lineNr" |
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lineNr := something. |
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"Created: / 14.5.1998 / 19:31:11 / cg" |
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! |
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nextStatement |
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^ nextStatement |
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! |
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nextStatement:s |
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nextStatement := s |
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! ! |
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!StatementNode methodsFor:'code generation'! |
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codeForSideEffectOn:aStream inBlock:b for:aCompiler |
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"generate code for this statement - value not needed" |
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expression notNil ifTrue:[ |
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expression codeForSideEffectOn:aStream inBlock:b for:aCompiler |
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] |
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! |
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codeOn:aStream inBlock:b for:aCompiler |
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"generate code for this statement" |
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expression codeOn:aStream inBlock:b for:aCompiler |
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! ! |
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!StatementNode methodsFor:'enumerating'! |
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nodeDo:anEnumerator |
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"helper for parse tree walking" |
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|stats this| |
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"/ too stupid: ST/X statements are linked as a list ... |
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stats := OrderedCollection new. |
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this := self. |
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[this notNil] whileTrue:[ |
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stats add:this expression. |
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this := this nextStatement |
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]. |
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^ anEnumerator doSequence:self temporaries:#() statements:stats |
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"Created: 19.6.1997 / 16:45:34 / cg" |
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"Modified: 19.6.1997 / 17:06:47 / cg" |
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! ! |
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!StatementNode methodsFor:'evaluation'! |
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evaluate |
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|lastValue thisStatement| |
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thisStatement := self. |
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[thisStatement notNil] whileTrue:[ |
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lastValue := thisStatement evaluateExpression. |
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thisStatement := thisStatement nextStatement |
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]. |
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^ lastValue |
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! |
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evaluateExpression |
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^ expression evaluate |
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! ! |
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!StatementNode methodsFor:'printing & storing'! |
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printAllOn:aStream |
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self printAllOn:aStream indent:4 |
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! |
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printAllOn:aStream indent:i |
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|thisStatement| |
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thisStatement := self. |
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[thisStatement notNil] whileTrue:[ |
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aStream spaces:i. |
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thisStatement printOn:aStream indent:i. |
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thisStatement nextStatement notNil ifTrue:[ |
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aStream nextPut:$.. |
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aStream cr. |
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]. |
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thisStatement := thisStatement nextStatement |
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] |
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! |
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printOn:aStream indent:i |
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expression printOn:aStream indent:i. |
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! ! |
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!StatementNode methodsFor:'queries'! |
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collectBlocksInto:aCollection |
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|this ex| |
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this := self. |
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[this notNil] whileTrue:[ |
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ex := this expression. |
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ex notNil ifTrue:[ |
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ex collectBlocksInto:aCollection. |
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]. |
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this := this nextStatement |
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]. |
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"Created: 23.10.1996 / 15:44:13 / cg" |
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"Modified: 20.4.1997 / 12:10:18 / cg" |
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! |
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isConstant |
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nextStatement notNil ifTrue:[^ false]. |
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^ expression isConstant |
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! |
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|
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listEndsWithReturn |
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|thisStatement lastStatement| |
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thisStatement := self. |
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[thisStatement notNil] whileTrue:[ |
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lastStatement := thisStatement. |
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thisStatement := thisStatement nextStatement |
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]. |
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^ lastStatement isReturnNode |
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"Created: 19.8.1996 / 14:32:47 / cg" |
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! ! |
219 |
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220 |
!StatementNode class methodsFor:'documentation'! |
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222 |
version |
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^ '$Header: /cvs/stx/stx/libcomp/StatementNode.st,v 1.24 2000-08-31 10:03:37 cg Exp $' |
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! ! |