author | Claus Gittinger <cg@exept.de> |
Sat, 26 Jun 1999 15:46:21 +0200 | |
changeset 871 | ada5288239e4 |
parent 817 | 8de90dbed4bb |
child 876 | 950dac5c8ad0 |
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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ParseNode subclass:#AssignmentNode |
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instanceVariableNames:'variable expression 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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!AssignmentNode 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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documentation |
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node for parse-trees, representing assignments. |
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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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!AssignmentNode class methodsFor:'instance creation'! |
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variable:v expression:e |
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^ (self basicNew) variable:v expression:e |
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! ! |
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!AssignmentNode methodsFor:'accessing'! |
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expression |
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^ expression |
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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 / 19:30:49 / 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 / 19:30:54 / cg" |
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! |
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variable |
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^ variable |
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variable:v expression:e |
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variable := v. |
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expression := e |
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! ! |
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!AssignmentNode methodsFor:'code generation'! |
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checkIncDecOn:aStream |
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"check if we can use incMvar / decMvar instruction. |
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If so, code it and return true. |
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Otherwise, return false." |
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|sel erec arg code| |
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(variable type == #MethodVariable) ifTrue:[ |
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expression isBinaryMessage ifTrue:[ |
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sel := expression selector. |
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erec := expression receiver. |
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((sel == #+) or:[sel == #-]) ifTrue:[ |
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(erec type == #MethodVariable) ifTrue:[ |
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(erec index == variable index) ifTrue:[ |
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arg := expression arg1. |
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arg isConstant ifTrue:[ |
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(arg value == 1) ifTrue:[ |
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(sel == #+) ifTrue:[ |
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code := #incMethodVar |
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] ifFalse:[ |
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code := #decMethodVar |
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]. |
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aStream nextPut:code; nextPut:(expression lineNumber); nextPut:(variable index). |
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^ true |
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] |
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] |
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] |
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] |
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] |
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] |
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]. |
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^ false |
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"Modified: 1.3.1996 / 00:08:02 / cg" |
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codeForSideEffectOn:aStream inBlock:b for:aCompiler |
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(self checkIncDecOn:aStream) ifTrue:[^ self]. |
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self codeNormalOn:aStream valueNeeded:false inBlock:b for:aCompiler |
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"Modified: 4.9.1995 / 14:38:10 / claus" |
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"Modified: 1.3.1996 / 00:42:10 / cg" |
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! |
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codeNormalOn:aStream valueNeeded:forValue inBlock:b for:aCompiler |
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|isSend litIdx selLitIdx| |
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isSend := expression isMessage. |
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(lineNr notNil |
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and:[isSend not]) ifTrue:[ |
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self codeLineNumber:lineNr on:aStream for:aCompiler |
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]. |
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"/ must do workspace variables here, because these |
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"/ need the receiver (the valueHolder) to be pushed first, |
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"/ then the value which is to be stored. |
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"/ finally, a #value: message is generated. |
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(variable type == #WorkspaceVariable) ifTrue:[ |
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"/ this is done by keeping the valueHolder in the literalArray, |
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"/ and coding a #value: message here. |
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litIdx := aCompiler addLiteral:variable value. |
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aStream nextPut:#pushLitS; nextPut:litIdx. |
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expression codeOn:aStream inBlock:b for:aCompiler. |
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selLitIdx := aCompiler addLiteral:#value:. |
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selLitIdx <= 255 ifTrue:[ |
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aStream nextPut:#sendDrop1; nextPut:(lineNr ? 1); nextPut:selLitIdx. |
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] ifFalse:[ |
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aStream nextPut:#sendDropL; nextPut:(lineNr ? 1); nextPut:selLitIdx; nextPut:0; nextPut:1 "nargs". |
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]. |
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|
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forValue ifTrue:[ |
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(expression isConstant or:[expression isVariable]) ifTrue:[ |
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expression codeOn:aStream inBlock:b for:aCompiler. |
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] ifFalse:[ |
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"/ fetch value from the holder - sigh |
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aStream nextPut:#pushLitS; nextPut:litIdx. |
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|
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selLitIdx := aCompiler addLiteral:#value. |
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selLitIdx <= 255 ifTrue:[ |
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aStream nextPut:#send0; nextPut:(lineNr ? 1); nextPut:selLitIdx. |
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] ifFalse:[ |
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aStream nextPut:#sendL; nextPut:(lineNr ? 1); nextPut:selLitIdx; nextPut:0; nextPut:1 "nargs". |
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]. |
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] |
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]. |
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^ self |
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]. |
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expression codeOn:aStream inBlock:b for:aCompiler. |
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expression isBlock ifTrue:[ |
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variable isLocal ifTrue:[ |
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aStream nextPut:#blockRef |
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] |
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]. |
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(lineNr notNil |
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and:[isSend]) ifTrue:[ |
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self codeLineNumber:lineNr on:aStream for:aCompiler |
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]. |
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variable codeStoreOn:aStream inBlock:b valueNeeded:forValue for:aCompiler |
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"Modified: 4.9.1995 / 14:38:10 / claus" |
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"Created: 1.3.1996 / 00:41:43 / cg" |
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"Modified: 21.10.1996 / 16:26:33 / cg" |
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! |
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codeOn:aStream inBlock:b for:aCompiler |
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(self checkIncDecOn:aStream) ifTrue:[ |
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expression receiver codeOn:aStream inBlock:b for:aCompiler. |
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^ self |
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]. |
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self codeNormalOn:aStream valueNeeded:true inBlock:b for:aCompiler |
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"Modified: 1.3.1996 / 00:42:21 / cg" |
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! ! |
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||
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!AssignmentNode methodsFor:'enumeration'! |
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|
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nodeDo:anEnumerator |
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"helper for parse tree walking" |
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Claus Gittinger <cg@exept.de>
parents:
479
diff
changeset
|
214 |
|
69a1cd05c7d6
added node-walk facility (ST80 compatibility)
Claus Gittinger <cg@exept.de>
parents:
479
diff
changeset
|
215 |
^ anEnumerator doAssignment:self variable:variable value:expression |
69a1cd05c7d6
added node-walk facility (ST80 compatibility)
Claus Gittinger <cg@exept.de>
parents:
479
diff
changeset
|
216 |
|
69a1cd05c7d6
added node-walk facility (ST80 compatibility)
Claus Gittinger <cg@exept.de>
parents:
479
diff
changeset
|
217 |
"Modified: 19.6.1997 / 16:37:50 / cg" |
69a1cd05c7d6
added node-walk facility (ST80 compatibility)
Claus Gittinger <cg@exept.de>
parents:
479
diff
changeset
|
218 |
! ! |
69a1cd05c7d6
added node-walk facility (ST80 compatibility)
Claus Gittinger <cg@exept.de>
parents:
479
diff
changeset
|
219 |
|
140 | 220 |
!AssignmentNode methodsFor:'evaluating'! |
221 |
||
222 |
evaluate |
|
223 |
|value| |
|
224 |
value := expression evaluate. |
|
225 |
variable store:value. |
|
226 |
^ value |
|
227 |
! ! |
|
228 |
||
0 | 229 |
!AssignmentNode methodsFor:'printing'! |
230 |
||
231 |
printOn:aStream indent:i |
|
232 |
variable printOn:aStream. |
|
233 |
aStream nextPutAll:' := '. |
|
234 |
expression printOn:aStream |
|
235 |
! ! |
|
140 | 236 |
|
237 |
!AssignmentNode methodsFor:'queries'! |
|
238 |
||
479 | 239 |
collectBlocksInto:aCollection |
240 |
expression collectBlocksInto:aCollection. |
|
241 |
||
242 |
"Created: 11.1.1997 / 20:54:30 / cg" |
|
243 |
! |
|
244 |
||
140 | 245 |
isAssignment |
246 |
"return true, if this is a node for an assignment" |
|
247 |
||
248 |
^ true |
|
249 |
! ! |
|
250 |
||
148 | 251 |
!AssignmentNode class methodsFor:'documentation'! |
252 |
||
253 |
version |
|
871
ada5288239e4
support for workspace variables
Claus Gittinger <cg@exept.de>
parents:
817
diff
changeset
|
254 |
^ '$Header: /cvs/stx/stx/libcomp/AssignmentNode.st,v 1.28 1999-06-26 13:46:21 cg Exp $' |
148 | 255 |
! ! |