Squeak-dev August 1998

squeak-dev@lists.squeakfoundation.org

99 participants
188 discussions

Re: nil or #nil?
by Tim Olson 23 Aug '98

23 Aug '98

>Table _ #( (-1 -1 ) 2 3 nil). > >Apparently, the Smalltalk that T-Gen was written for (?) treats nil as a >special case. But for Squeak, (Table at: 4) == #nil (not nil). This was >pretty tricky since it looks like a nil when you print it out. If you >inspect it, however, you see that it is an array with three elements. > >I'm thinking that this is so confusing that Squeak should adopt the >behavior of recognizing 'nil' as a special case inside of a constant array. > >Any thoughts? I think it is correct the way it is in Squeak -- literal vectors are built from unevaluated literals, where all literals are "self-evaluating" (evaluate to themselves). The value of the symbol nil is the symbol nil, which is different from the standard value nil (the sole instance of UndefinedObject). Making a special case for nil here starts one down the slippery slope of mixing up symbols and variables (values). What about #true and #false -- would you expect them to exist in the literal vector as symbols or Booleans? What about symbols which match existing entries in the SystemDictionary, such as classes? In fact, making such a change would break some existing code. For example, TMethod>>isSubstitutableNode:intoMethod:in: uses exactly this construct: . . (#(self true false nil) includes: var) ifTrue: [ ^ true ]. . . Here the the code is expecting the literal vector #(self true false nil) to be the vector of symbols #self, #true, #false, and #nil. Squeak already has braceNodes to allow easy definition of evaluated arrays, for example: Table := { {-1. -1}. 2. 3. nil}. More portably, one can explicitly build the array: Table := Array with: (Array with: -1 with: -1) with: 2 with: 3 with: nil. -- tim

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Re: True dialog windows
by Tim Olson 23 Aug '98

23 Aug '98

>I may be missing something, but I don't see anything that looks like real >dialog window support in Squeak. Is there something available? The FillInTheBlank class provides dialog support for text entry, and SelectionMenu>>confirm: can be used for yes/no dialog boxes. What support in particular are you looking for? -- tim

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Re: Squeak and Secure Sockets
by gr＠fuzzy.uba.ar 23 Aug '98

23 Aug '98

Hola Georg Gollmann! > > I have recently added strong authentication/encryption to my GemStone > webserver (the grandfather of Mark=B4s PWS) using SSLeay > (http://www.psy.uq.oz.au/~ftp/Crypto/). > > Now I am curious whether there is interest in secure networking in Sque= > ak. > The fastest way would probably be to define a new socketType in > Socket>primSocketCreateNetwork:... and expand the networking glue code = > to > make calls to SSLeay. > > Comments anyone ? I've been myself thinking about adding some crypto to Squeak, and I will not have any problems as I'm in Argentina, BUT be very careful with crypto, becouse if crypto is strong it cannot be exported FROM USA (it's not legal) By strong crypto I mean RSA with keys larger than 256 bits (I'm not sure if it's 256 or what), and many other schems... I'm not sure, but a code that does weak crypto but can be modified to make strong crypto (by changing a 256 for a 1024) may be exported, again, I'm not sure. Be careful. Warning Bye! Richie++

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Morphic & Self 4.0
by Kevin Fisher 23 Aug '98

23 Aug '98

This is just a general question...I now have access to a Solaris box that is running Self 4.0. I'm eager to dive into Morphic, but I'm wondering if there is any benefit to playing with it on Self first, before trying it in Squeak? A quick glance shows me that the Self Morphic interface is somewhat different than what I've seen under Squeak, although there is enough commonality between the two (except that Self won't run on anything but an 8-bit display :p ). (I must say that that huge collaborative workspace is intreguing...any plans for amalgamating that into Squeak?)

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What #fork returns
by Bob Arning 22 Aug '98

22 Aug '98

In porting the Refactoring Browser, one of the differences between VW and Squeak that has emerged is the value returned by #fork. VW seems to return the newly created Process while Squeak returns the receiver. I think the VW approach is nicer. Thoughts? Cheers, Bob

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Re: Memory mysteries (Linux)
by Ian Piumarta 22 Aug '98

22 Aug '98

> SqueakVM-2.0-i586-linux-2.1.24 -m40m Squeak2.1.image Replace the -m40m with -memory 40m and it will work. Don't forget that you can also set environment variables if you want to change the defaults (these can still be overridden with command-line options): SQUEAK_IMAGE default image name (e.g. "my.image") SQUEAK_MEMORY default memory size (e.g. "40m") SQUEAK_LAZY implies "-lazy" if set SQUEAK_NOTITLE implies "-notitle" if set SQUEAK_FULLSCREEN implies "-fullscreen" if set SQUEAK_XSHM implies "-xshm" if set SQUEAK_XASYNC implies "-xasync" if set > Do I recall correctly that running an 2.1 image with a 2.0 VM is OK? A 2.1 VM for i586-linux has been in the usual place for a while. Ian

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Re: Implementing changes in the base system was: Apples to Oranges ...
by invader＠zilker.net 22 Aug '98

22 Aug '98

I'm a lot newer to this list than I am to Smalltalk. I haven't seen any postings of actual code on the list yet, so I don't know how that is done. mkd >Mike, > >If you know how to make the change, do it and post the change set to >the list. > >Even I, a Squeak Guru Wannabe Level I, have been able to contribute to >the base! > >Get Cracken, > >John-Reed Maffeo

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"thisContext selector" (the revenge)
by Alejandro F. Reimondo 22 Aug '98

22 Aug '98

"Alejandro F. Reimondo" <<aleReimondo(a)sugarweb.com> wrote... >>What can I do to get the sent selector of thisContext >> from the VM stack (or current method) ? Tim Olson <<tim(a)jumpnet.com> replied... >You will have to look at the bytecode prior to the sender's PC to >determine its type. If it is a literal send (> 208), then you can get >the selector using something like: > | method pc | > method := thisContext sender method. > pc := thisContext sender pc. > ^ method literals at: ((method at: pc-1) - 207) >Common selectors .... [snip] > >You can determine the selector for these by building a >bytecode->selector dictionary. Dan Ingalls <<DanI(a)wdi.disney.com>> replied... >...[snip]...you can get all of the special selectors, ..[snip]... >Smalltalk specialObjectsArray at: 24 It is working ok as suggested by Tim and using the expression Smalltalk specialSelectorAt: index to find the special selectors. It works the first time! but... what happens when you send a #perform: message? It is solved in a primitive method that sends the message inside the VM; activating a new method context to solve the performed message. Then, when I look for the sent message in the context, the message found is #perform:... and the activated method is NOT the #perform implementation Ouch! The #perform: implementation does not create a MethodContext because it is a primitive method! mmm... When I search in the contexts (actual and the sender's context) I can find the #perform: selector, but the arguments are missing ( has been absorbed by primitive) Provably the problem will be difficult to solve with the contexts information only... Is there any known (easy) way to solve the #perform: problem? thanks. Ale.

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Memory mysteries (Linux)
by Jörg Rade 21 Aug '98

21 Aug '98

Hi Squeakers, my system is running under Linux (2.1.115) and has 64MB physical memory. Despite the fact that Squeak is invoked with a commandline argument of -m30m it reports: uptime 1h4m23s memory 5,226,856 bytes old 4,822,476 bytes (92.3%) young 84,284 bytes (1.6%) used 4,906,760 bytes (93.9%) free 320,096 bytes (6.1%) GCs 7,137 (541ms between GCs) full 3 in 2,118ms (0% uptime), avg 706.0ms incr 7134 in 32,994ms (1.0% uptime), avg 5.0ms tenures 2 (avg 3567 GCs/tenure) Anybody knows what's wrong here? j|g

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Implementing changes in the base system was: Apples to Oranges ...
by John-Reed Maffeo 21 Aug '98

21 Aug '98

Mike, If you know how to make the change, do it and post the change set to the list. Even I, a Squeak Guru Wannabe Level I, have been able to contribute to the base! Get Cracken, John-Reed Maffeo

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