Squeak-dev January 2005

squeak-dev@lists.squeakfoundation.org

134 participants
235 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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[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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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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Re: Yahoo!
by Cg 11 Jun '05

11 Jun '05

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Where are system globals (Smalltalk and SystemOrganization)
by Aaron Gray 01 Jun '05

01 Jun '05

Are Smalltalk and SystemOrganization "global variables". If so where are the system globals and how do I list them, within a browser and say to the Transaction window from the workspace ? Aaron

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[ANN] Kedama version 2.0
by Yoshiki Ohshima 02 May '05

02 May '05

Hello, I've been working on a parallel particle programming system called Kedama. The last version wasn't quite good enough to announce, but I feel this version is a bit better. Kedama is deeply inspired by StarLogo and StarSqueak. In Kedama, you can control thousands of objects with eToy-like tile scripts. Please take a look at: http://www.is.titech.ac.jp/~ohshima/squeak/kedama2/ and give it a try. Thank you! -- Yoshiki

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Problems building Win32 Squeak
by Aaron Gray 20 Mar '05

20 Mar '05

Hi, I have downloaded the 3.7.1 Win32 source and tools from SourceForge and have tried building Squeak, but am getting link time errors. The following symbols are undefined :- win32JoystickDebugInfo win32JoystickDebugPrintRawValues win32JoystickDebugPrintAlternativeValues win32DebugPrintSocketState 'sqWin32FilePrims.o' seems to be missing from the link as there are further undefined symbols from this file. And there are thurther error messages... Help, Aaron

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Squeak People posting summary
by cg＠cdegroot.com 24 Feb '05

24 Feb '05

Below are the most recent 5 articles that were posted on Squeak People (http://people.squeakfoundation.org/). Apart from the articles, you will find people's diary entries there, and an overview of the Squeak community: who is doing what, people's "standing", etcetera. If you don't have an account, please join - we're interested in getting to know you better! This message is posted automatically every week by a dirty shell script. _________________________________________________________________ Date: 2005-01-10 04:23:15 Author: elvislives Title: squeak logo lookalike Hi, _________________________________________________________________ Date: 2004-12-30 16:37:02 Author: jj Title: Boosting Squeak: RockSolid images I have read the "rant" and "unrant" subject with a mix of uneasiness (embarrassment) and fear. The "Rant" thread began on the 15th of december 2004, and produced a lot of discussion. I will not summarize the thread, because a lot of people read it. Instead, I will go forward and try to find a pragmatic and constructive of helping the community (and yes, I am also very bold and handosome :) << ironic comment). _________________________________________________________________ Date: 2004-12-20 00:34:35 Author: cdegroot Title: Terminus is up'n'running Terminus, the little system I cobbled up to export Squeak People's account and web-of-trust information, is up and running. The first app is a [1]Wiki which uses Terminus to decide whether certain actions are possible. _________________________________________________________________ Date: 2004-09-25 15:46:37 Author: avi Title: Unstable Squeak I'd like to announce Unstable Squeak: an experimental fast-moving, community-based developer-oriented distribution of Squeak. Unstable Squeak leverages Squeak Source, Squeak People, and Monticello to try to present an alternative model for incoporating fixes and enhancements from the community with a minimum of process. _________________________________________________________________ Date: 2004-09-08 21:24:22 Author: cdegroot Title: Multi-window Squeak the simple way? I might be alone here, or not, but often I find the "let's take over the desktop" approach of Squeak a bit too intrusive. There might be a solution that's simpler than interfacing Squeak with every GUI toolkit out there on the planet... References 1. file://localhost/seaside/wiki --- (end of posting. Thank you for your patience)

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