January 2014 - Pharo-dev - lists.pharo.org

Smalltalk Impact

by Sean DeNigris

Last week I attended an event at the The Metropolitan Museum of Art Media Lab. While networking, two educators told me that they use Scratch with their kidsâ¦ not knowing I knew anything about it. They showed me some of their students' projects and were so proud and excited. They were also intrigued when I shared Scratch's lineage, connecting the dots back to the dynabook vision of computers as a metamedium to transform human thought. I talked about Smalltalk, and directed them to Phratch - and its ability to create tiles - as a bridge between tile-based and "full fledged" programming, for those students who yearn for more expressive power. I thought you'd like to know that all of our work is rippling out in ways we can't imagineâ¦ Cheers, Sean

Jan. 14, 2014

Re: [Pharo-dev] [squeak-dev] The Trunk: Kernel-nice.831.mcz

by Nicolas Cellier

Thanks! I will try to post a SLICE this evening with a test. Note that between 3 & 4 am, I have excuses for just pressing forward button on my opened gmail page. A posteriori, if logging on fogbugz, searching for right classification of report, entitling, copy-pasting, accepting just take you one second, I'm very happy to just have pressed the forward button, this obviously was the optimal collective efficiency ;) cheers 2014/1/14 Marcus Denker <marcus.denker(a)inria.fr> > I copy and pasted this mail to the bug tracker (took 1 second): > > > https://pharo.fogbugz.com/f/cases/12642/bug-in-NumberParser-when-reading-a-… > > > On 14 Jan 2014, at 03:48, Nicolas Cellier < > nicolas.cellier.aka.nice(a)gmail.com> wrote: > > No time to open a bug, but this should better be fixed before 3.0 release > > ---------- Forwarded message ---------- > From: <commits(a)source.squeak.org> > Date: 2014/1/14 > Subject: [squeak-dev] The Trunk: Kernel-nice.831.mcz > To: squeak-dev(a)lists.squeakfoundation.org, > packages(a)lists.squeakfoundation.org > > > Nicolas Cellier uploaded a new version of Kernel to project The Trunk: > http://source.squeak.org/trunk/Kernel-nice.831.mcz > > ==================== Summary ==================== > > Name: Kernel-nice.831 > Author: nice > Time: 14 January 2014, 3:43:29.851 am > UUID: 5c62dca4-bf8e-4330-9cb1-9cd24047aac6 > Ancestors: Kernel-nice.830 > > 1) Fix awfull bug in NumberParser when reading a number with fraction part > (the trailing digits of the fraction might be skipped when there's many of > them because of incorrect update of lastNonZero position) > > This made this test fail: > self assert: (Float readFrom: (((1<<1075) reciprocal + (1<<1400) > reciprocal) printShowingDecimalPlaces: 2000)) = Float fmin. > > I just wanted to check NumberParser w.r.t. a former bug of dtoa, but it > failed for different reasons > http://www.exploringbinary.com/gays-strtod-returns-zero-for-inputs-just-abo… > > 2) Classify some as yet unclassified (or miss-classified) > > =============== Diff against Kernel-nice.830 =============== > > Item was changed: > + ----- Method: IllegalResumeAttempt>>defaultAction (in category > 'handling') ----- > - ----- Method: IllegalResumeAttempt>>defaultAction (in category > 'comment') ----- > defaultAction > "No one has handled this error, but now give them a chance to > decide how to debug it. If none handle this either then open debugger (see > UnhandedError-defaultAction)" > > UnhandledError signalForException: self! > > Item was changed: > + ----- Method: IllegalResumeAttempt>>isResumable (in category 'handling') > ----- > - ----- Method: IllegalResumeAttempt>>isResumable (in category 'comment') > ----- > isResumable > > ^ false! > > Item was changed: > + ----- Method: InMidstOfFileinNotification>>defaultAction (in category > 'handling') ----- > - ----- Method: InMidstOfFileinNotification>>defaultAction (in category > 'as yet unclassified') ----- > defaultAction > > self resume: false! > > Item was changed: > ----- Method: NumberParser>>nextLargeIntegerBase:nPackets: (in category > 'parsing-large int') ----- > nextLargeIntegerBase: aRadix nPackets: nPackets > "Form a Large integer with incoming digits from sourceStream. > Return this integer, or zero if no digits found. > Stop reading when no more digits or when nPackets elementary > LargeInteger have been encountered. > Count the number of digits and the lastNonZero digit and store > them in instVar" > > + | high nDigitsHigh lastNonZeroHigh low nDigitsLow halfPackets | > - | high nDigitsHigh low nDigitsLow halfPackets | > halfPackets := nPackets bitShift: -1. > halfPackets = 0 ifTrue: [^self nextElementaryLargeIntegerBase: > aRadix]. > high := self nextLargeIntegerBase: aRadix nPackets: halfPackets. > high isLarge ifFalse: [^high]. > nDigitsHigh := nDigits. > + lastNonZeroHigh := lastNonZero. > low := self nextLargeIntegerBase: aRadix nPackets: halfPackets. > nDigitsLow := nDigits. > nDigits := nDigitsHigh + nDigitsLow. > + lastNonZero := lastNonZero = 0 > + ifTrue: [lastNonZeroHigh] > + ifFalse: [lastNonZero + nDigitsHigh]. > - lastNonZero = 0 ifFalse: [lastNonZero := lastNonZero + > nDigitsHigh]. > ^high * (aRadix raisedToInteger: nDigitsLow) + low! > > > > >

Jan. 14, 2014

Re: [Pharo-dev] Displaying labels with Athens on Linux?

by Igor Stasenko

so, yes on newer version of ubuntu it crashing. no clue why (yet) On 14 January 2014 18:15, Alexandre Bergel <alexandre.bergel(a)me.com> wrote: > Ok, thanks Igor. > > This is really important for us to have Athens working well :-) > I will soon start my lecture on software quality, and I will have about 10 > or 20 students working with it. > > Alexandre > > > On Jan 14, 2014, at 12:57 PM, Igor Stasenko <siguctua(a)gmail.com> wrote: > > > > > > > > > On 14 January 2014 16:28, Alexandre Bergel <alexandre.bergel(a)me.com> > wrote: > > The following expression seems to reproduce the problem > > AthensCairoSurfaceExamples exampleDrawText > > > > On windows and OSX it works well. On Linux it crashes > > > > yes.. more details: > > we just tried with Damien on his machine, which has more recent version > of Ubuntu, > > and we got the crash.. > > on my version everything works well.. > > > > in this regard i suspecting Cairo library.. i going to install fresh > version of ubuntu and try things there. > > > > Alexandre > > > > On Jan 13, 2014, at 5:58 PM, Igor Stasenko <siguctua(a)gmail.com> wrote: > > > > > > > > > > > > > > On 13 January 2014 14:53, Alexandre Bergel <alexandre.bergel(a)me.com> > wrote: > > > Hi! > > > > > > Sergio is experiencing some serious problem when displaying labels in > Athens? > > > The VM just crashes. > > > > > > Any idea what we can do? > > > > > > > > > i still didn't had time to look at it. i will try to look at it with > Ronie tomorrow, luckily he runs on linux box. > > > it would be nice if you can give a short piece of code which > (re)produces the crash. > > > > > > Alexandre > > > -- > > > _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > > > Alexandre Bergel http://www.bergel.eu > > > ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > > > > > > > > > > > > > > > > > > > > > > > > -- > > > Best regards, > > > Igor Stasenko. > > > > -- > > _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > > Alexandre Bergel http://www.bergel.eu > > ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > > > > > > > > > > > > > > > > -- > > Best regards, > > Igor Stasenko. > > -- > _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > Alexandre Bergel http://www.bergel.eu > ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > > > > > -- Best regards, Igor Stasenko.

Jan. 14, 2014

Re: [Pharo-dev] Roassal Visualization for control flow graph issues

by Alexandre Bergel

Hi ClÃ©ment, Thanks for your nice words. Layouts provided by Roassal are well known generic algorithm. Creating a new layout is not complicated at all. Just subclass ROLayout and override the hook methods. Creating a layout for your need is not easy. Have you tried to google for a layout? If you find one, it should be rather easy to implement it. Alexandre On Jan 14, 2014, at 12:50 PM, ClÃ©ment Bera <bera.clement(a)gmail.com> wrote: > Hello Roassal developers, > > A few time ago Usman Bhatti showed me Roassal. Today I decided to use it for my daily work on a project that aims to optimize Pharo's methods. > > Firstly I am quite impressed by the quality of Roassal, I am currently using the Roassal + Mondrian builder and I have a visual representation which is very close to what I want after 1 hour of work with the help of Usman. Good job guys. > > Here are 2 examples of what I use: > > exampleIfTrueIfFalse2 > | a b | > a := true. > a > ifTrue: [ > false ifTrue: [ ^ b := 1 ] ifFalse: [ b := 2 ] ] > ifFalse: [ > true ifTrue: [ b := 4 ] ifFalse: [ b := 5 ] ]. > ^ b > > <Screen Shot 2014-01-14 at 4.14.49 PM.png> > > Here there's one rectangle for each basic block, entrance/exits are basic blocks with bigger borders, and borders in red represents the "hot path", which the path the execution flow most frequently uses (based on native code counters added at some spots in the method by Cogit). > > Another example: > > exampleToDo > > 1 to: 10 do: [ :i | > self kick: i ] > > <Screen Shot 2014-01-14 at 4.36.47 PM.png> > > Now I have a few issues with the layout. I am currently using the narrowTreeLayout which seems to be the best for my visualisation. > > issue 1: When branches merges, which is in a tree when a node has 2 or more parents, or when I have a #ifTrue:ifFalse:, the child is not well aligned horizontally. Here in the first visualisation I showed, BasicBlock 5 is below but not in the middle of Basic block 8,7 and 4 (horizontally). I put a minimal width for each basic block to make it better but it's still not perfect. > issue 2: (most important issue) I cannot display back jumps because then all the graph is missdrawn, therefore I need to remember where they are instead of visualizing them all the time (I cannot display the back jump from basic block 3 to basic block 2 in the second representation. In addition, the back jump edge, when well displayed, overlaps the basic blocks visualizations. > > Here is an example of what I would like for the edges and basic block positions: > > <Screen Shot 2014-01-14 at 4.27.32 PM.png> > > As you can see, here exit is in the middle of B2 and B5 horizontally, which is not the case in my roassal visualization. > In addition, there's a back jump from B6 to B4 that I cannot display (or all the visual representation goes nuts). The edge for the back jump does not overlap with the basic blocks. In this graph, arrows follow a grid. I don't care that arrows are diagonals instead of a mix of horizontal and vertical lines but I would like to be able to see nicely the back jumps as in this graph. > > Do you have an idea on what layout/view options I could use with Roassal +Mondrian to have a better result ? > > I tried to create my own layout but after 2 hours I understood this cost too much time for my planning (or perhaps I'm just too dumb to do it fast :-( ). > > Anyway, the representation I have now is good enough for me to use it. But a better one would be better, especially for back jumps :-). > > Thanks for any help. > > Clement -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.

Jan. 14, 2014

Re: [Pharo-dev] Displaying labels with Athens on Linux?

by Alexandre Bergel

Ok, thanks Igor. This is really important for us to have Athens working well :-) I will soon start my lecture on software quality, and I will have about 10 or 20 students working with it. Alexandre On Jan 14, 2014, at 12:57 PM, Igor Stasenko <siguctua(a)gmail.com> wrote: > > > > On 14 January 2014 16:28, Alexandre Bergel <alexandre.bergel(a)me.com> wrote: > The following expression seems to reproduce the problem > AthensCairoSurfaceExamples exampleDrawText > > On windows and OSX it works well. On Linux it crashes > > yes.. more details: > we just tried with Damien on his machine, which has more recent version of Ubuntu, > and we got the crash.. > on my version everything works well.. > > in this regard i suspecting Cairo library.. i going to install fresh version of ubuntu and try things there. > > Alexandre > > On Jan 13, 2014, at 5:58 PM, Igor Stasenko <siguctua(a)gmail.com> wrote: > > > > > > > > > On 13 January 2014 14:53, Alexandre Bergel <alexandre.bergel(a)me.com> wrote: > > Hi! > > > > Sergio is experiencing some serious problem when displaying labels in Athens? > > The VM just crashes. > > > > Any idea what we can do? > > > > > > i still didn't had time to look at it. i will try to look at it with Ronie tomorrow, luckily he runs on linux box. > > it would be nice if you can give a short piece of code which (re)produces the crash. > > > > Alexandre > > -- > > _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > > Alexandre Bergel http://www.bergel.eu > > ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > > > > > > > > > > > > > > > > -- > > Best regards, > > Igor Stasenko. > > -- > _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > Alexandre Bergel http://www.bergel.eu > ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > > > > > > > > -- > Best regards, > Igor Stasenko. -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.

Jan. 14, 2014

Re: [Pharo-dev] Pharo 3.0 not responding to mouse or keyboard after launch

by Nicolas Cellier

2014/1/13 Martin McClure <martin(a)hand2mouse.com> > On 01/13/2014 10:47 AM, Igor Stasenko wrote: > > Thanks, Martin. > > Happy to help. > > > I added this to issue tracker: > > https://pharo.fogbugz.com/f/cases/12641/VM-signal-handling-on-nix > > > > should be trivial to fix. > > Thanks! Yes, I'd think this fix would be easy. > > Just in case, note that I forwarded the message to vm-dev and that Eliot already fixed it in his svn cog branch for linux case. (I mean unmasking SIGALRM, not the absolute time problem) Regards, > > -Martin > >

Jan. 14, 2014

Re: [Pharo-dev] Displaying labels with Athens on Linux?

by Igor Stasenko

On 14 January 2014 16:28, Alexandre Bergel <alexandre.bergel(a)me.com> wrote: > The following expression seems to reproduce the problem > AthensCairoSurfaceExamples exampleDrawText > > On windows and OSX it works well. On Linux it crashes > > yes.. more details: we just tried with Damien on his machine, which has more recent version of Ubuntu, and we got the crash.. on my version everything works well.. in this regard i suspecting Cairo library.. i going to install fresh version of ubuntu and try things there. > Alexandre > > On Jan 13, 2014, at 5:58 PM, Igor Stasenko <siguctua(a)gmail.com> wrote: > > > > > > > > > On 13 January 2014 14:53, Alexandre Bergel <alexandre.bergel(a)me.com> > wrote: > > Hi! > > > > Sergio is experiencing some serious problem when displaying labels in > Athens? > > The VM just crashes. > > > > Any idea what we can do? > > > > > > i still didn't had time to look at it. i will try to look at it with > Ronie tomorrow, luckily he runs on linux box. > > it would be nice if you can give a short piece of code which > (re)produces the crash. > > > > Alexandre > > -- > > _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > > Alexandre Bergel http://www.bergel.eu > > ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > > > > > > > > > > > > > > > > -- > > Best regards, > > Igor Stasenko. > > -- > _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > Alexandre Bergel http://www.bergel.eu > ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > > > > > -- Best regards, Igor Stasenko.

Jan. 14, 2014

Roassal Visualization for control flow graph issues

by ClÃ©ment Bera

Hello Roassal developers, A few time ago Usman Bhatti showed me Roassal. Today I decided to use it for my daily work on a project that aims to optimize Pharo's methods. Firstly I am quite impressed by the quality of Roassal, I am currently using the Roassal + Mondrian builder and I have a visual representation which is very close to what I want after 1 hour of work with the help of Usman. Good job guys. Here are 2 examples of what I use: exampleIfTrueIfFalse2 | a b | a := true. a ifTrue: [ false ifTrue: [ ^ b := 1 ] ifFalse: [ b := 2 ] ] ifFalse: [ true ifTrue: [ b := 4 ] ifFalse: [ b := 5 ] ]. ^ b [image: Images intÃ©grÃ©es 1] Here there's one rectangle for each basic block, entrance/exits are basic blocks with bigger borders, and borders in red represents the "hot path", which the path the execution flow most frequently uses (based on native code counters added at some spots in the method by Cogit). Another example: exampleToDo 1 to: 10 do: [ :i | self kick: i ] [image: Images intÃ©grÃ©es 3] Now I have a few issues with the layout. I am currently using the narrowTreeLayout which seems to be the best for my visualisation. *issue 1:* When branches merges, which is in a tree when a node has 2 or more parents, or when I have a #ifTrue:ifFalse:, the child is not well aligned horizontally. Here in the first visualisation I showed, BasicBlock 5 is below but not in the middle of Basic block 8,7 and 4 (horizontally). I put a minimal width for each basic block to make it better but it's still not perfect. *issue 2:* (most important issue) I cannot display back jumps because then all the graph is missdrawn, therefore I need to remember where they are instead of visualizing them all the time (I cannot display the back jump from basic block 3 to basic block 2 in the second representation. In addition, the back jump edge, when well displayed, overlaps the basic blocks visualizations. Here is an example of what I would like for the edges and basic block positions: [image: Images intÃ©grÃ©es 2] As you can see, here exit is in the middle of B2 and B5 horizontally, which is not the case in my roassal visualization. In addition, there's a back jump from B6 to B4 that I cannot display (or all the visual representation goes nuts). The edge for the back jump does not overlap with the basic blocks. In this graph, arrows follow a grid. I don't care that arrows are diagonals instead of a mix of horizontal and vertical lines but I would like to be able to see nicely the back jumps as in this graph. Do you have an idea on what layout/view options I could use with Roassal +Mondrian to have a better result ? I tried to create my own layout but after 2 hours I understood this cost too much time for my planning (or perhaps I'm just too dumb to do it fast :-( ). Anyway, the representation I have now is good enough for me to use it. But a better one would be better, especially for back jumps :-). Thanks for any help. Clement

Jan. 14, 2014

Re: [Pharo-dev] Announcer registry behaviour with Spy

by btc＠openinworld.com

Jan. 14, 2014

Re: [Pharo-dev] Displaying labels with Athens on Linux?

by Alexandre Bergel

The following expression seems to reproduce the problem AthensCairoSurfaceExamples exampleDrawText On windows and OSX it works well. On Linux it crashes Alexandre On Jan 13, 2014, at 5:58 PM, Igor Stasenko <siguctua(a)gmail.com> wrote: > > > > On 13 January 2014 14:53, Alexandre Bergel <alexandre.bergel(a)me.com> wrote: > Hi! > > Sergio is experiencing some serious problem when displaying labels in Athens? > The VM just crashes. > > Any idea what we can do? > > > i still didn't had time to look at it. i will try to look at it with Ronie tomorrow, luckily he runs on linux box. > it would be nice if you can give a short piece of code which (re)produces the crash. > > Alexandre > -- > _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > Alexandre Bergel http://www.bergel.eu > ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > > > > > > > > -- > Best regards, > Igor Stasenko. -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.

Jan. 14, 2014