author | Claus Gittinger <cg@exept.de> |
Mon, 12 Jul 1999 17:13:44 +0200 | |
changeset 904 | 32b8cf2e577d |
parent 867 | 7d20544c2c63 |
child 991 | 16411f243a75 |
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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MessageNode subclass:#UnaryNode |
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instanceVariableNames:'' |
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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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!UnaryNode 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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" |
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node for parse-trees, representing unary messages |
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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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!UnaryNode class methodsFor:'instance creation'! |
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receiver:r selector:s |
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"return a new UnaryNode for sending selector s to receiver r. |
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Fold constants." |
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^ self receiver:r selector:s fold:nil |
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! |
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receiver:r selector:selectorString fold:folding |
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"return a new UnaryNode for sending selector selectorString to receiver r. |
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If folding is true, fold constant expressions." |
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|result recVal selector canFold globalName| |
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" |
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The constant folding code can usually not optimize things - this may change |
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when some kind of constant declaration is added to smalltalk. |
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" |
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canFold := false. |
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folding notNil ifTrue:[ |
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selector := selectorString asSymbolIfInterned. |
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selector notNil ifTrue:[ |
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"/ |
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"/ do constant folding ... |
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"/ |
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r isGlobal ifTrue:[ |
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globalName := r name. |
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recVal := r evaluate. |
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(globalName = 'Character') ifTrue:[ |
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( #( tab cr space backspace esc ) includes:selector) |
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ifTrue:[ |
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canFold := true |
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] |
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]. |
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(globalName = 'Float') ifTrue:[ |
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( #( pi unity zero ) includes:selector) |
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ifTrue:[ |
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(recVal respondsTo:selector) ifTrue:[ |
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canFold := true |
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] |
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] |
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]. |
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"/ no, this 'optimization' is not good - |
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"/ if bytecode is transported to another machine. |
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"/ However, the JIT compiler compensates for this ;-) |
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"/ (globalName = 'SmallInteger') ifTrue:[ |
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"/ ( #( minVal maxVal ) includes:selector) |
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"/ ifTrue:[ |
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"/ (recVal respondsTo:selector) ifTrue:[ |
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"/ canFold := true |
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"/ ] |
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"/ ] |
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"/ ] |
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]. |
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r isConstant ifTrue:[ |
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"check if we can do it ..." |
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recVal := r evaluate. |
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" |
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we could do much more here - but then, we need a dependency from |
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the folded selectors method to the method we generate code for ... |
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limit optimizations to those that will never change |
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(or, if you change them, it will crash badly anyway ...) |
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" |
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recVal respondsToArithmetic ifTrue:[ |
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(#( negated abs asPoint degreesToRadians radiansToDegrees |
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exp ln log sqrt reciprocal |
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arcCos arcSin arcTan sin cos tan) includes:selector) |
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ifTrue:[ |
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canFold := true |
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] |
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]. |
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recVal isCharacter ifTrue:[ |
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(#( asciiValue asInteger digitValue) includes:selector) |
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ifTrue:[ |
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canFold := true |
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] |
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]. |
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recVal isString ifTrue:[ |
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(selector == #withCRs) ifTrue:[ |
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canFold := (folding >= #level2) or:[folding == #full] |
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]. |
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(selector == #size) ifTrue:[ |
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canFold := (folding >= #level1) or:[folding == #full] |
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] |
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]. |
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(recVal isMemberOf:Array) ifTrue:[ |
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(#(asFloatArray asDoubleArray) includes:selector) ifTrue:[ |
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canFold := (folding >= #level2) or:[folding == #full] |
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] |
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] |
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] |
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]. |
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parents:
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canFold ifTrue:[ |
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(recVal respondsTo:selector) ifTrue:[ |
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SignalSet anySignal "Number domainErrorSignal" handle:[:ex | |
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"in case of an error, abort fold and return original" |
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ex return |
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] do:[ |
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result := recVal perform:selector. |
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^ ConstantNode type:(ConstantNode typeOfConstant:result) value:result |
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]. |
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"when we reach here, something went wrong (something like 0.0 log)" |
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^ 'error occured when evaluating constant expression' |
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]. |
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]. |
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]. |
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^ (self basicNew) receiver:r selector:selectorString args:nil lineno:0 |
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"Modified: / 3.2.1999 / 12:56:32 / cg" |
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! ! |
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!UnaryNode methodsFor:'checks'! |
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plausibilityCheck |
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"check for funny selector - careful to do string compare instead |
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of symbol identity compare: I dont want to introduce these as symbols |
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into the system (would make the '... is nowhere implemented' warning |
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go away." |
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((selector = 'self') or:[ |
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(selector = 'super') or:[ |
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(selector = 'thisContext') or:[ |
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(selector = 'true') or:[ |
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(selector = 'false') or:[ |
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(Smalltalk includesKey:selector)]]]]]) ifTrue:[ |
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^ 'funny selector; possible missing ''.'' or keyword' |
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]. |
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" |
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more to come |
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... |
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" |
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^ super plausibilityCheck |
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! ! |
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!UnaryNode methodsFor:'code generation'! |
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codeOn:aStream inBlock:b for:aCompiler |
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"append bytecode for the receiver to aStream." |
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|rSel notSelector| |
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selector := selector asSymbol. |
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" |
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optimize |
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(a == b) not -> (a ~~ b) |
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(a ~~ b) not -> (a == b) |
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" |
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(selector == #not) ifTrue:[ |
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(receiver class == BinaryNode) ifTrue:[ |
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((rSel := receiver selector) == #==) ifTrue:[ |
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notSelector := #~~ |
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] ifFalse:[ |
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(rSel == #~~) ifTrue:[ |
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notSelector := #== |
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] |
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]. |
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notSelector notNil ifTrue:[ |
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(BinaryNode receiver:(receiver receiver) |
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selector:notSelector |
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arg:(receiver arg)) codeOn:aStream inBlock:b for:aCompiler. |
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^ self |
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] |
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] |
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]. |
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||
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" |
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optimize |
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Float pi |
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" |
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(selector == #pi) ifTrue:[ |
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(receiver isGlobal) ifTrue:[ |
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receiver name = 'Float' ifTrue:[ |
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aCompiler addLiteral:#Float; addLiteral:selector. |
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(ConstantNode type:#Float value:(Float pi)) |
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codeOn:aStream inBlock:b for:aCompiler. |
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^ self |
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] |
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] |
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]. |
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^ super codeOn:aStream inBlock:b for:aCompiler |
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"Modified: 23.10.1997 / 02:04:51 / cg" |
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! ! |
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!UnaryNode methodsFor:'evaluating'! |
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evaluate |
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"evaluate the expression represented by the receiver" |
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diff
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selector := selector asSymbol. |
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diff
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receiver isSuper ifTrue:[ |
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^ super evaluate |
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]. |
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^ (receiver evaluate) perform:selector |
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! ! |
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||
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!UnaryNode methodsFor:'printing'! |
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||
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printOn:aStream indent:i |
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"prettyprint the expression represented by the receiver" |
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||
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|needParen| |
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||
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needParen := false. |
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receiver isMessage ifTrue:[ |
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receiver isUnaryMessage ifFalse:[ |
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needParen := true |
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]. |
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]. |
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needParen ifTrue:[ |
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aStream nextPutAll:'(' |
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]. |
271 |
receiver printOn:aStream. |
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needParen ifTrue:[ |
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aStream nextPutAll:') ' |
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]. |
275 |
aStream space. |
|
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selector printString printOn:aStream. |
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" aStream space. " |
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! ! |
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140 | 279 |
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!UnaryNode methodsFor:'queries'! |
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||
282 |
isUnaryMessage |
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283 |
"return true, if this node is one for a unary message" |
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^ true |
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"Modified: 23.10.1997 / 02:05:18 / cg" |
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! ! |
289 |
||
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!UnaryNode class methodsFor:'documentation'! |
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||
292 |
version |
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^ '$Header: /cvs/stx/stx/libcomp/UnaryNode.st,v 1.29 1999-07-12 15:13:44 cg Exp $' |
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! ! |