Squeak-dev May 2005

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153 participants
243 discussions

veryDeepCopy, ImageSegments, and actionMaps
by Ned Konz 17 Aug '23

17 Aug '23

Any Object can have dependents whether or not it has an instance variable to keep track of them (these are kept in the DependentsFields class variable of Object). The only class that keeps its own dependents is Model. Any Object can have an actionMap. These are supplied by EventManager class by default, and are stored in the ActionMaps class variable of EventManager. The only class that keeps its own action maps is Morph. When we veryDeepCopy an object we also copy the global dependents (see DeepCopier>>fixDependents). However, we don't copy the actionMap in those cases where it's held by the EventManager class. When we file out an object that uses DependentsFields out into an ImageSegment, we also file out the dependents (see ImageSegment>>dependentsSave:) if it's in a project. We do this by adding a project parameter called #GlobalDependentsInProject. However, we don't file out the actionMap in those cases where it's held by the EventManager class. My question is this: should we fix these behaviors (copying and serialization) to include these "global action maps" just like we already include the "global dependents"? Or should we discourage the use of the "global action maps"? -- Ned Konz http://bike-nomad.com GPG key ID: BEEA7EFE

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Trying to build SerialPlugin for IrDA under MPW (MacOS 8.6)
by Hans-Martin Mosner 24 May '12

24 May '12

Hi, I recently got a serial IrDA adapter and wanted to play around with it under Squeak. This adapter has a baudrate switching mechanism which depends on toggling the DTR and RTS lines in the correct sequence. To support this, I wanted to build a new SerialPlugin with an additional primitive. However, the plugin as built with MPW does not seem to be accepted by the VM, which still uses the internal plugin in all cases. I've tried placing the plugin in a 'Plugins' subfolder of the VM's folder, and then directly into the VM folder, without any success. I have considered placing debug outputs in appropriate places in the VM, but building a complete VM with MPW is not easy - I would have to create an MPW makefile for the whole shebang, which is more work than I can invest at the moment. Does any of you Mac aficionados have an idea where the problem could be? I have appended the plugin and corresponding source files in a ZIP file (it's not big) so if you want to try it out you could do it right now :-) BTW, would it make sense to incorporate support for switching serial port parameters of an open port into the standard plugin? Closing and opening a port just to change the baud rate seems a little overkill... Cheers, Hans-Martin

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RE: Progrmaming in Bytecode?
by Swan, Dean 24 Nov '06

24 Nov '06

>> It's not uncommon to find x86 code padded with a lot of NOPs >> that weren't in the original source. > >Cowardly assembler! ;-) > >> [NOPs...] Sometimes they're there to pad the execution pipeline, and >> sometimes it's just because the code generator allocates a whole large >> enough for the largest form of an instruction to simplify the branch >> target calculations. > >We must be talking about M$oft assemblers here. ;^p) Yes. This has been pretty characteristic of MS assemblers as far back as I can remember (i.e. about MASM 2.0 - I remember being quite excited when MASM 4.0 came out - '186 and '286 code!). >The real problem is that the solution in general might require N >iterations for a piece of code with N branches -- if promoting one of them >from short to long causes the next (or, much more problematically, a >preceding) one to become long too. You're such an optimist. O(n) is close to best case for this problem. >This is a weak form of what I suppose one might call an "oscillating >constraints" problem. (Hands up anyone who has ever seen [La]TeX get Hence, stochastic optimization. Even MS uses stochastic optimizers now, even in vb. (didn't want to say that too loud here. ;) ) >The usual cause for "padding" in (capable) assemblers (other than for >prefetch alignment, as you point out) is due to dynamic linking where the >size of call sites isn't known until link time. (On modern systems the Not only prefetch alignment. I have heard, although I don't know the details that sometimes it's desirable to force a dead cycle in the execution pipeline. I can only guess that this would be to influence the scheduling of the execution units for complex instructions, but I consider myself to be only a "casual observer" with respect to this kind of thing. >In Smalltalk you've also got a bigger problem: for very long methods the >range of even unconditional branches might not be enough, at which point >I know this has nothing whatsoever to do with Smalltalk...) Well, to kind of tie this back into something relevant to Squeak - I know a few people have talked about "new" VM instruction sets. It seems that it might help to think about a VM where all instructions are the same size. This could simplify code generation (i.e. compiling methods), and possibly improve performance and *reduce* code size (at least in the case of long methods). The anticipated performance improvement would come from forcing aligned fetches more often and potentially simpler instruction decoding. It's really nice to work with an architecture where all instructions take up one word of memory, take one cyle to execute, and sometimes can cause five or six different useful things to occur during that one cycle. (ok, so I write a lot of DSP code...) The single cycle thing isn't necessarily relevant for Smalltalk, but those "extended" bytecodes are really distasteful to me. -Dean

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[ANN] Audio Video Library
by Martin Kuball 07 Oct '06

07 Oct '06

Hi I would like to annonce my project to build a Library for processing audio and video material with squeak. I put a 1st version on the SqueakSource at kilana.unibe.ch. It's not much yet. But you can load and analyze avi container with mpeg 4 video and mp2 and mp3 audio content. I did this because I needed a tool to repair some broken avi files. Other tools I tried just failed badly. Try this: RIFFArchive openOn: 'test.avi' "use explore it to get a nice tree view of the chunks in the avi" "open a transcript and execute the following to get some information about the contents" (RIFFArchive openOn: 'test.avi') analyzeVideoStream "To extract the streams inside the avi container do:" (RIFFArchive openOn: 'some.avi') extractAllStreamsToFile: 'base_fileName'. "If you have raw streams you can create an avi this way:" | avi | avi := AVIFile with: (M4VStream on: 'video.m4v') with: (MPAStream on: 'audio.mp3'). avi runtime: 100. avi frameRate: 24000 / 1001. avi createIndex. "not working yet" avi writeTo: (StandardFileStream newFileNamed: 'test.avi') Here is my tentative todo list. - write more documentation and tests - cleanup and speedup - add more container formats like mp4, matroska - add mpeg2 handling (-> dvd authoring???) - connect with the other multimedia bits in squeak (sound, video playing, ...) The project is of course open for everyone to join. Enjoy, Martin

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[BUG] SM2 Burps after loading Breakpoint support or ColorDevTools
by Thomas A Petersen 05 Dec '05

05 Dec '05

Herman, Goran, et. al, I don't think your Jacaranda script is the problem. I tried the same exercise from a clean 3.7 5566 image and loading SM2 Loader first thing. I get the same crash with Breakpoint Support and ColorDevTools. Checking the change sorter shows that things are installed. There appears to be something going on as SM2 finishes things. Goran, Oh Great Sage of SM.... Can you enlihton us? Thanks much, tap P.S. Here's the debug log. Could this be a side effect of the translation stuff?? ----------------------------------------------------- MessageNotUnderstood: Character>>first 1 December 2003 3:22:52 pm VM: Win32 - Squeak3.5 of '11 April 2003' [latest update: #5180] Image: Squeak3.7alpha [latest update: #5566] Character(Object)>>doesNotUnderstand: #first Receiver: $5 Arguments and temporary variables: aMessage: a Message with selector: #first and arguments: #() Receiver's instance variables: value: 53 SMSqueakMap>>installedVersionOf: Receiver: a SMSqueakMap Arguments and temporary variables: aPackage: SMPackage[Breakpoint Support] Receiver's instance variables: packages: a Dictionary(an UUID ('010894c3-0b8a-47fc-8deb-7c08996bfa71')->SMPackage[OSProcessPlugin] an UUID('017b1882-9376-4bf7-b...etc... accounts: a Dictionary(an UUID ('034ab782-a939-de49-976c-b009701b4406')->SMAccount[Todd Blanchard] an UUID ('035d2bda-c301-6049-b...etc... objects: a Dictionary(an UUID ('007e8c1c-02fa-45fc-97be-7ea4d2f67134')->SMCategory: Package group an UUID ('008c9940-4caf-ac49-a...etc... categories: nil dir: 'sm' transactionCounter: 3011 firstTransactionNumber: 2929 daysBacklog: 182 adminPassword: nil installedPackages: a Dictionary(an UUID ('07469ced-289a-4b6f-bd17-27ec567e681a')->'1.25' an UUID ('1200100f-1a95-...etc... installCounter: nil fileCache: a SMFileCache users: nil --- The full stack --- Character(Object)>>doesNotUnderstand: #first -----------------------------------------------------

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OpenAL 1.1
by Brad Fuller 04 Nov '05

04 Nov '05

The Game Developers Conference ended this week and Creative discussed OpenAL 1.1. This new version includes some extensions that may be beneficial to me and potentially to others. In a previous msg Mark mentioned that OpenAL plugins have been made and are used in Croquet. I have a few questions: * How can Squeak users obtain the plugins and use it in our current images? * How can OpenAL plugins be integrated into 3.9 to be available for all? * Has there been any discussion regarding extending the plugins to OpenAL v1.1? * To facilitate the migration from 1.0 to 1.1, the OpenAL community is providing a few extensions to v1.0. One of the main issues of OpenAL, for me anyway, is that it does not have facilities for recording. Fortunately, this has changed in v1.1. The 1.0 recording extension is: EXT_capture. Has anyone started work on this or on any other extensions? (more info on extensions: http://openal.org/extensions.html) brad -- ________________________________ Hear us online: www.Sonaural.com Brad Fuller (408) 799-6124 ** Sonaural Audio Studios ** (408) 799-6123 West San Jose (408) 799-6124 Cambrian

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About MAC VM
by stéphane ducasse 13 Sep '05

13 Sep '05

hi john I hope your travel back was good. It was good to have you around at ESUG. I wanted to know if this would be possible that when we double click on an image and that there is already one squeak running, we get another one. Because now we are all copying VM around. Stef

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Current Harvesting Status/Organization
by Ken Causey 01 Sep '05

01 Sep '05

I'm wondering what the current status is of the harvesting process from the standpoint of the harvesters. I'm a little bit bothered by the most recent addition to 3.9alpha. Judging from the HTTP info 6667TallySupport-ab.cs went into the update stream on the 22nd or 23rd. For some reason this update has no preamble although the versions both in BFAV (closed by the Janitors) and with the issue (ID 1014) on Mantis have preambles. Also the issue on Mantis is still marked as new and there is no evidence that harvesting (beyond the review step) is occurring regarding this issue. I realize we are in a highly transitional time here and that as a result there may be some confusion, but even if we don't have solid stated procedures I would hope that anyone modifying the update stream will make some effort to maintain a minimum level of documentation regarding the handling of each issue. Admittedly I'm complaining here a little bit. But more than anything I would really like to have a bit better understanding of how updates will be entering the update stream in near future and what sort of changes, if any, those doing that work would like to see in the process. Very shortly I want to state publicly that in my opinion the future of Squeak progress is in the form of individuals and teams taking direct responsibility for packages and parts of the image. I think that anyone who has an interest in doing this should not wait and should speak up ASAP. Ken

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re: another balloon picture
by Darius 11 Aug '05

11 Aug '05

Looks terrific. But will it fly? :^) Which 3D tool did you design it with? Blender? Could we have a copy of the 3D model?

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RE: Will Wright's Spore
by Darius 22 Jul '05

22 Jul '05

I like how a doctor recreated schizophrenia in Second Life: http://secondlife.blogs.com/nwn/2004/09/in_the_minds_ey.html

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