February 2011 - Pharo-dev - lists.pharo.org

Re: [Pharo-project] [COTDC] 13 - NullEncoder

by laurent laffont

On Wed, Feb 16, 2011 at 6:02 PM, Igor Stasenko <siguctua(a)gmail.com> wrote: > On 16 February 2011 17:46, laurent laffont <laurent.laffont(a)gmail.com> > wrote: > > Today: NullEncoder > > > > I am a Canvas superclass with completely misleading name and purpose. > yep. And not referenced. Should be merged with Canvas ? Laurent. > > -- > Best regards, > Igor Stasenko AKA sig. > >

Feb. 16, 2011

Re: [Pharo-project] could we agree to remove caseOf: and caseOf:otherwise:

by Eliot Miranda

On Tue, Feb 15, 2011 at 11:50 PM, StÃ©phane Ducasse < stephane.ducasse(a)inria.fr> wrote: > Eliot a final question. > So how will you handle OPAL compiler change in Cog? > Do you require that marcus and jorge have to deal with decompiler of > caseOf: in addition to all the rest? > Is it a strong requirement? Because then this is clear that Opal will be > delayed. But may be it is not that important after all. > Just curious. > OPAL is a Smalltalk compiler. I can therefore assume that it will compile Smalltalk. caseOf: is valid Smalltalk and so will be compiled by OPAL. Whether Marcus chooses to optimise caseOf: or not is up to him. > Stef > (if you think that I focus on details then I'm certainly an idiot). > > >

Feb. 16, 2011

Re: [Pharo-project] could we agree to remove caseOf: and caseOf:otherwise:

by Eliot Miranda

On Tue, Feb 15, 2011 at 11:17 PM, StÃ©phane Ducasse < stephane.ducasse(a)inria.fr> wrote: > But it looks like a DSL to me. No its not. caseOf: is valid Smalltalk. It is another control structure defined in the library rather than by the language, just like do:, inject:into: et al. It is extremely useful in certain circumstances. It can be (and is) optimized. Functional languages support case statements that are conceptually similar. caseOf: (and those of functional languages) are *much* more powerful than the switch statement of C: caseOf: can dispatch on arbitrary values, not just integer indices; caseOf:'s selectors (the things on the left of the ->'s) can be expressions, not just constants. > So caseOf: could be moved to Cog. Fine. Let me be equally pig-headed then. I'm not going to spend any more energy on this, and I'm not going to spend any more energy on Cog in Pharo. This is ridiculous. > Stef > > On Feb 15, 2011, at 10:28 PM, Benoit St-Jean wrote: > > > Eliot, > > > > Now I fully understand the pain you'd have to go through (and others > involved in the VM) if we'd remove this method we don't "like"... I guess > it's way easier to live with #caseOf: than live without it... > > > > CogIA32Compiler>>#computeMaximumSize, when one method is worth a thousand > words... > > > > > > > > ----------------- > > Benoit St-Jean > > Yahoo! Messenger: bstjean > > A standpoint is an intellectual horizon of radius zero. > > (Albert Einstein) > > > > > > From: Eliot Miranda <eliot.miranda(a)gmail.com> > > To: Pharo-project(a)lists.gforge.inria.fr > > Sent: Tue, February 15, 2011 3:56:11 PM > > Subject: Re: [Pharo-project] could we agree to remove caseOf: and > caseOf:otherwise: > > > > > > > > On Tue, Feb 15, 2011 at 12:39 PM, StÃ©phane Ducasse < > stephane.ducasse(a)inria.fr> wrote: > > Eliot > > > > I can understand that well. Now we could just let this code in VMMaker > and not inlining. > > We fix 8 users and we are done. I have concerned that we have a complex > solution because it is complex > > for a couple of use case. Of course we can do nothing (and we will > probably not do it now) but in that case we can > > also stop pharo right now because a large part of the system could follow > the exact same principle. > > > > That's a false distinction. There's nothing wrong with caseOf: and not > addressing it will not leave Pharo any the worse. Case statements are not > in themselves evil in the right context. The main problems with the > index/dictionary approach are that > > a) the solution is no longer contained in a single method > > b) the dictionary is metadata that needs to be updated in an initialize > method; forget to initialize the dictionary when an index changes and your > program is broken. > > > > As my first wife said "don't sweat the petty stuff; pet the sweaty > stuff". > > > > > > BTW, there's a false assumption that has been stated in this thread that > the caseOf: statement is only used with explicit integers. It can be used > with anything. Expressions, class constants etc. > > > > BTW why marcus and jorge work on Opal because the compiler is just > working good? > > > > Now I will focus on 1.2, FS, Opal if I can help, and the rest but caseOf: > will be in our radar. > > > > Just a remark if people would have spend the time to write mail to fix > the users of caseof: in the image and > > other non VMmaker package we would have get already done. > > > > Fix this (rhetorical - I think this is /much/ better as a single case > statement than as an index/dictionary refactoring, both in Smalltalk and > when translated to C): > > > > CogIA32Compiler>>computeMaximumSize > > "Compute the maximum size for each opcode. This allows jump > offsets to > > be determined, provided that all backward branches are long > branches." > > "N.B. The ^maxSize := N forms are to get around the compiler's > long branch > > limits which are exceeded when each case jumps around the > otherwise." > > opcode caseOf: { > > "Noops & Pseudo Ops" > > [Label] -> [^maxSize := 0]. > > [AlignmentNops] -> [^maxSize := (operands at: 0) - > 1]. > > [Fill16] -> > [^maxSize := 2]. > > [Fill32] -> > [^maxSize := 4]. > > [FillFromWord] -> [^maxSize := 4]. > > [Nop] -> [^maxSize := 1]. > > "Specific Control/Data Movement" > > [CDQ] -> [^maxSize := 1]. > > [IDIVR] -> [^maxSize := 2]. > > [IMULRR] -> [^maxSize := 3]. > > [CPUID] -> [^maxSize := 2]. > > [CMPXCHGAwR] -> [^maxSize := 7]. > > [CMPXCHGMwrR] -> [^maxSize := 8]. > > [LFENCE] -> [^maxSize := 3]. > > [MFENCE] -> [^maxSize := 3]. > > [SFENCE] -> [^maxSize := 3]. > > [LOCK] -> [^maxSize := 1]. > > [XCHGAwR] -> [^maxSize := 6]. > > [XCHGMwrR] -> [^maxSize := 7]. > > [XCHGRR] -> [^maxSize := 2]. > > "Control" > > [Call] -> [^maxSize := 5]. > > [JumpR] -> [^maxSize := 2]. > > [Jump] -> [self > resolveJumpTarget. ^maxSize := 5]. > > [JumpLong] -> [self > resolveJumpTarget. ^maxSize := 5]. > > [JumpZero] -> [self > resolveJumpTarget. ^maxSize := 6]. > > [JumpNonZero] -> [self resolveJumpTarget. > ^maxSize := 6]. > > [JumpNegative] -> [self resolveJumpTarget. > ^maxSize := 6]. > > [JumpNonNegative] -> [self resolveJumpTarget. > ^maxSize := 6]. > > [JumpOverflow] -> [self resolveJumpTarget. > ^maxSize := 6]. > > [JumpNoOverflow] -> [self resolveJumpTarget. > ^maxSize := 6]. > > [JumpCarry] -> [self > resolveJumpTarget. ^maxSize := 6]. > > [JumpNoCarry] -> [self resolveJumpTarget. > ^maxSize := 6]. > > [JumpLess] -> [self > resolveJumpTarget. ^maxSize := 6]. > > [JumpGreaterOrEqual] -> [self resolveJumpTarget. > ^maxSize := 6]. > > [JumpGreater] -> [self resolveJumpTarget. > ^maxSize := 6]. > > [JumpLessOrEqual] -> [self resolveJumpTarget. > ^maxSize := 6]. > > [JumpBelow] -> [self > resolveJumpTarget. ^maxSize := 6]. > > [JumpAboveOrEqual] -> [self resolveJumpTarget. > ^maxSize := 6]. > > [JumpAbove] -> [self resolveJumpTarget. > ^maxSize := 6]. > > [JumpBelowOrEqual] -> [self resolveJumpTarget. > ^maxSize := 6]. > > [JumpLongZero] -> [self resolveJumpTarget. > ^maxSize := 6]. > > [JumpLongNonZero] -> [self resolveJumpTarget. > ^maxSize := 6]. > > [JumpFPEqual] -> [self resolveJumpTarget. > ^maxSize := 6]. > > [JumpFPNotEqual] -> [self resolveJumpTarget. > ^maxSize := 6]. > > [JumpFPLess] -> [self resolveJumpTarget. > ^maxSize := 6]. > > [JumpFPGreaterOrEqual] -> [self resolveJumpTarget. > ^maxSize := 6]. > > [JumpFPGreater] -> [self resolveJumpTarget. > ^maxSize := 6]. > > [JumpFPLessOrEqual] -> [self resolveJumpTarget. > ^maxSize := 6]. > > [JumpFPOrdered] -> [self resolveJumpTarget. > ^maxSize := 6]. > > [JumpFPUnordered] -> [self resolveJumpTarget. > ^maxSize := 6]. > > [RetN] -> [^maxSize := > (operands at: 0) = 0 > > > ifTrue: [1] > > > ifFalse: [3]]. > > "Arithmetic" > > [AddCqR] -> [^maxSize := (self isQuick: > (operands at: 0)) > > > ifTrue: [3] > > > ifFalse: [(self concreteRegister: (operands at: 1)) = EAX > > > ifTrue: [5] > > > ifFalse: [6]]]. > > [AndCqR] -> [^maxSize := (self isQuick: > (operands at: 0)) > > > ifTrue: [3] > > > ifFalse: [(self concreteRegister: (operands at: 1)) = EAX > > > ifTrue: [5] > > > ifFalse: [6]]]. > > [CmpCqR] -> [^maxSize := (self isQuick: > (operands at: 0)) > > > ifTrue: [3] > > > ifFalse: [(self concreteRegister: (operands at: 1)) = EAX > > > ifTrue: [5] > > > ifFalse: [6]]]. > > [OrCqR] -> [^maxSize := (self isQuick: > (operands at: 0)) > > > ifTrue: [3] > > > ifFalse: [(self concreteRegister: (operands at: 1)) = EAX > > > ifTrue: [5] > > > ifFalse: [6]]]. > > [SubCqR] -> [^maxSize := (self isQuick: > (operands at: 0)) > > > ifTrue: [3] > > > ifFalse: [(self concreteRegister: (operands at: 1)) = EAX > > > ifTrue: [5] > > > ifFalse: [6]]]. > > [AddCwR] -> [^maxSize := (self > concreteRegister: (operands at: 1)) = EAX > > > ifTrue: [5] > > > ifFalse: [6]]. > > [CmpCwR] -> [^maxSize := (self > concreteRegister: (operands at: 1)) = EAX > > > ifTrue: [5] > > > ifFalse: [6]]. > > [SubCwR] -> [^maxSize := (self > concreteRegister: (operands at: 1)) = EAX > > > ifTrue: [5] > > > ifFalse: [6]]. > > [XorCwR] -> [^maxSize := (self > concreteRegister: (operands at: 1)) = EAX > > > ifTrue: [5] > > > ifFalse: [6]]. > > [AddRR] -> [^maxSize := 2]. > > [AndRR] -> [^maxSize := 2]. > > [CmpRR] -> [^maxSize := 2]. > > [OrRR] -> [^maxSize := 2]. > > [XorRR] -> [^maxSize := 2]. > > [SubRR] -> [^maxSize := 2]. > > [NegateR] -> [^maxSize := 2]. > > [LoadEffectiveAddressMwrR] > > -> [^maxSize := ((self > isQuick: (operands at: 0)) > > > ifTrue: [3] > > > ifFalse: [6]) > > > + ((self concreteRegister: (operands at: 1)) = ESP > > > ifTrue: [1] > > > ifFalse: [0])]. > > [LogicalShiftLeftCqR] -> [^maxSize := (operands > at: 0) = 1 > > > ifTrue: [2] > > > ifFalse: [3]]. > > [LogicalShiftRightCqR] -> [^maxSize := (operands at: 0) = > 1 > > > ifTrue: [2] > > > ifFalse: [3]]. > > [ArithmeticShiftRightCqR] -> [^maxSize := (operands > at: 0) = 1 > > > ifTrue: [2] > > > ifFalse: [3]]. > > [LogicalShiftLeftRR] -> [self > computeShiftRRSize]. > > [LogicalShiftRightRR] -> [self > computeShiftRRSize]. > > [ArithmeticShiftRightRR] -> [self > computeShiftRRSize]. > > [AddRdRd] -> [^maxSize := 4]. > > [CmpRdRd] -> [^maxSize := 4]. > > [SubRdRd] -> [^maxSize := 4]. > > [MulRdRd] -> [^maxSize := 4]. > > [DivRdRd] -> [^maxSize := 4]. > > [SqrtRd] -> > [^maxSize := 4]. > > "Data Movement" > > [MoveCqR] -> [^maxSize := (operands at: 0) = > 0 ifTrue: [2] ifFalse: [5]]. > > [MoveCwR] -> [^maxSize := 5]. > > [MoveRR] -> [^maxSize := 2]. > > [MoveAwR] -> [^maxSize := (self > concreteRegister: (operands at: 1)) = EAX > > > ifTrue: [5] > > > ifFalse: [6]]. > > [MoveRAw] -> [^maxSize := (self > concreteRegister: (operands at: 0)) = EAX > > > ifTrue: [5] > > > ifFalse: [6]]. > > [MoveRMwr] -> [^maxSize := ((self isQuick: > (operands at: 1)) > > > ifTrue: [3] > > > ifFalse: [6]) > > > + ((self concreteRegister: (operands at: 2)) = ESP > > > ifTrue: [1] > > > ifFalse: [0])]. > > [MoveRdM64r] -> [^maxSize := ((self isQuick: (operands > at: 1)) > > > ifTrue: [5] > > > ifFalse: [8]) > > > + ((self concreteRegister: (operands at: 2)) = ESP > > > ifTrue: [1] > > > ifFalse: [0])]. > > [MoveMbrR] -> [^maxSize := ((self isQuick: > (operands at: 0)) > > > ifTrue: [3] > > > ifFalse: [6]) > > > + ((self concreteRegister: (operands at: 1)) = ESP > > > ifTrue: [1] > > > ifFalse: [0])]. > > [MoveRMbr] -> [^maxSize := ((self isQuick: > (operands at: 1)) > > > ifTrue: [3] > > > ifFalse: [6]) > > > + ((self concreteRegister: (operands at: 2)) = ESP > > > ifTrue: [1] > > > ifFalse: [0])]. > > [MoveM16rR] -> [^maxSize := ((self isQuick: (operands > at: 0)) > > > ifTrue: [4] > > > ifFalse: [7]) > > > + ((self concreteRegister: (operands at: 1)) = ESP > > > ifTrue: [1] > > > ifFalse: [0])]. > > [MoveM64rRd] -> [^maxSize := ((self isQuick: (operands > at: 0)) > > > ifTrue: [5] > > > ifFalse: [8]) > > > + ((self concreteRegister: (operands at: 1)) = ESP > > > ifTrue: [1] > > > ifFalse: [0])]. > > [MoveMwrR] -> [^maxSize := ((self isQuick: > (operands at: 0)) > > > ifTrue: [3] > > > ifFalse: [6]) > > > + ((self concreteRegister: (operands at: 1)) = ESP > > > ifTrue: [1] > > > ifFalse: [0])]. > > [MoveXbrRR] -> [self assert: (self concreteRegister: > (operands at: 0)) ~= ESP. > > ^maxSize := (self > concreteRegister: (operands at: 1)) = EBP > > > ifTrue: [5] > > > ifFalse: [4]]. > > [MoveXwrRR] -> [self assert: (self concreteRegister: > (operands at: 0)) ~= ESP. > > ^maxSize := (self > concreteRegister: (operands at: 1)) = EBP > > > ifTrue: [4] > > > ifFalse: [3]]. > > [MoveRXwrR] -> [self assert: (self concreteRegister: > (operands at: 1)) ~= ESP. > > ^maxSize := (self > concreteRegister: (operands at: 2)) = EBP > > > ifTrue: [4] > > > ifFalse: [3]]. > > [PopR] -> [^maxSize := 1]. > > [PushR] -> [^maxSize := 1]. > > [PushCw] -> [^maxSize := 5]. > > [PrefetchAw] -> [^maxSize := self hasSSEInstructions > ifTrue: [7] ifFalse: [0]]. > > "Conversion" > > [ConvertRRd] -> [^maxSize := 4] }. > > ^0 "to keep C compiler quiet" > > > > Stef > > > > > > > > > > > > > > > > On Mon, Feb 14, 2011 at 11:00 PM, StÃ©phane Ducasse > > > > <stephane.ducasse(a)inria.fr> wrote: > > > >> > > > >> Eliot > > > >> > > > >> you use caseOf: for the generation of C in Slang and VM maker. > > > >> Now this means that > > > >> - it does not need to be inlined > > > > > > > > No. If it is not inlined the simulator will go *much* slower. e.g. > > > > CogVMSimulatorLSB>>byteAt: byteAddress > > > > | lowBits long | > > > > lowBits := byteAddress bitAnd: 3. > > > > long := self longAt: byteAddress - lowBits. > > > > ^(lowBits caseOf: { > > > > [0] -> [ long ]. > > > > [1] -> [ long bitShift: -8 ]. > > > > [2] -> [ long bitShift: -16 ]. > > > > [3] -> [ long bitShift: -24 ] > > > > }) bitAnd: 16rFF > > > > > > > > > > so why not put it: > > > > > > ^ (long bitShift: (-8*lowBits) ) bitAnd: 16rFF > > > > > > ? > > > Or this will be slower than caseOf: ? > > > > > > Because that was the way the code was written. I just copied the > method. Further, it is only one example. I'm not going to rewrite the > VMMaker's uses of caseOf: jyst to suit some whim of purity. It is making > unnecessary work. Taking it out is *much* more work (/and/ emotional > energy) than just leaving it alone. Can't we try and be constructive? > > > > > > > > > > > > >> > > > >> - it could be packaged with VMMaker > > > > > > > > No. It needs to be in the compiler to be inlined. Why have you got > on this > > > > hobby-horse? It is a non-issue. caseOf: ios not widelty used but > extremely > > > > useful in certain circumstances. This has the feeling of a religious > > > > pogrom, not a rational approach to the system. IIABDFI = If It Ain't > Broke, > > > > Don't Fix It. > > > > > > This concept kinda appeal to me. > > > From other side, i am also strongly feel that house should be kept > clean :) > > > > > > >> > > > >> Are these two points correct? > > > > > > > > No, IMO, definitely not. > > > > > > > >> > > > >> Stef > > > >> > > > > > > > > > > > > > > > > > > > > -- > > > Best regards, > > > Igor Stasenko AKA sig. > > > > > > > > > > > > > > > > > > >

Feb. 16, 2011

Re: [Pharo-project] Pharo 1.2 broken on Hudson

by Guillermo Polito

Torsten, PharoOB has global read and write access. Everyone have access to it :). On Wed, Feb 16, 2011 at 9:32 AM, Torsten Bergmann <astares(a)gmx.de> wrote: > Pharo 1.2. is broken on Hudson. > > The ConfigurationOfPharo is not loadable on a core image due > to changes on OmniBrowser. > > Reason: > ======= > ConfigurationOfOmniBrowser-GuillermoPolito.102.mcz in > http://www.squeaksource.com/MetacelloRepository > references "OB-Shout-JohanBrichau.13" in spec for: #pharo in its > version 1.2.4 > > But OB-Shout-JohanBrichau.13 is not in http://www.squeaksource.com/PharoOB > Should we use "OB-Shout-GuillermoPolito.13.mcz" instead? > > Guillermo: can you give me access to PharoOB too? > > Thx > T. > > > -- > Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir > belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de >

Feb. 16, 2011

Re: [Pharo-project] [COTDC] 13 - NullEncoder

by Igor Stasenko

On 16 February 2011 18:02, Igor Stasenko <siguctua(a)gmail.com> wrote: > On 16 February 2011 17:46, laurent laffont <laurent.laffont(a)gmail.com> wrote: >> Today: Â NullEncoder >> > > I am a Canvas superclass with completely misleading name and purpose. > ... which gives an impression that drawing using canvas is a way of 'encoding' objects on display surface. > -- > Best regards, > Igor Stasenko AKA sig. > -- Best regards, Igor Stasenko AKA sig.

Feb. 16, 2011

Re: [Pharo-project] [COTDC] 13 - NullEncoder

by Igor Stasenko

On 16 February 2011 17:46, laurent laffont <laurent.laffont(a)gmail.com> wrote: > Today: Â NullEncoder > I am a Canvas superclass with completely misleading name and purpose. -- Best regards, Igor Stasenko AKA sig.

Feb. 16, 2011

[Pharo-project] [COTDC] 13 - NullEncoder

by laurent laffont

Today: NullEncoder Comment Of The Day Contest - One Day One Comment Rules: #1: Each day a not commented class is elected. Each day the best comment will be integrated with name of the author(s). #2: If you cannot comment it, deprecate it. Results: http://code.google.com/p/pharo/wiki/CommentOfTheDayContest Laurent

Feb. 16, 2011

Re: [Pharo-project] [COTDC] 12 - PluggableListMorphByItem

by laurent laffont

Gary you won. Laurent On Tue, Feb 15, 2011 at 7:03 PM, Gary Chambers <gazzaguru2(a)btinternet.com>wrote: > "Essentially useless in its current form. Probably intended to eventually > deal with actual objects in the list rather than indexing/string-forms." > > Regards, Gary > > ----- Original Message ----- > *From:* laurent laffont <laurent.laffont(a)gmail.com> > *To:* An open mailing list to discuss any topics related to an > open-sourceSmalltalk <pharo-project(a)lists.gforge.inria.fr> > *Sent:* Tuesday, February 15, 2011 5:37 PM > *Subject:* [Pharo-project] [COTDC] 12 - PluggableListMorphByItem > > Today: PluggableListMorphByItem > > > Comment Of The Day Contest - One Day One Comment > Rules: > #1: Each day a not commented class is elected. Each day the best comment > will be integrated with name of the author(s). > #2: If you cannot comment it, deprecate it. > Results: http://code.google.com/p/pharo/wiki/CommentOfTheDayContest > > Laurent > >

Feb. 16, 2011

Re: [Pharo-project] Issue 3719 in pharo: No OmniBrowser!

by pharo＠googlecode.com

Updates: Status: Closed Comment #3 on issue 3719 by laurent....(a)gmail.com: No OmniBrowser! http://code.google.com/p/pharo/issues/detail?id=3719 (No comment was entered for this change.)

Feb. 16, 2011

Re: [Pharo-project] Issue 3719 in pharo: No OmniBrowser!

by pharo＠googlecode.com

Comment #2 on issue 3719 by georgi...(a)gmail.com: No OmniBrowser! http://code.google.com/p/pharo/issues/detail?id=3719 Thanks! It works fine.

Feb. 16, 2011