Squeak-dev September 2020

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The Trunk: Collections-mt.908.mcz
by commits＠source.squeak.org 14 Sep '20

14 Sep '20

Marcel Taeumel uploaded a new version of Collections to project The Trunk: http://source.squeak.org/trunk/Collections-mt.908.mcz ==================== Summary ==================== Name: Collections-mt.908 Author: mt Time: 14 September 2020, 6:27:49.862914 pm UUID: abfcedd9-2516-7c49-b6e9-714619e50986 Ancestors: Collections-eem.907 Fixes some error messages regarding #become(Forward):. =============== Diff against Collections-eem.907 =============== Item was changed: ----- Method: Array>>elementsExchangeIdentityWith: (in category 'converting') ----- elementsExchangeIdentityWith: otherArray "This primitive performs a bulk mutation, causing all pointers to the elements of the receiver to be replaced by pointers to the corresponding elements of otherArray. At the same time, all pointers to the elements of otherArray are replaced by pointers to the corresponding elements of this array. The identityHashes remain with the pointers rather than with the objects so that objects in hashed structures should still be properly indexed after the mutation." <primitive: 128 error: ec> ec == #'no modification' ifTrue: [^self modificationForbiddenFor: otherArray becomeSelector: #elementsExchangeIdentityWith:]. ec == #'bad receiver' ifTrue: [^self error: 'receiver must be of class Array']. ec == #'bad argument' ifTrue: [^self error: (otherArray class == Array + ifFalse: ['arg must be of class Array'] + ifTrue: ['receiver and argument must have the same size'])]. - ifTrue: ['arg must be of class Array'] - ifFalse: ['receiver and argument must have the same size'])]. ec == #'inappropriate operation' ifTrue: [^self error: 'can''t become immediates such as SmallIntegers or Characters']. ec == #'object is pinned' ifTrue: [^self error: 'can''t become pinned objects']. ec == #'insufficient object memory' ifTrue: [| maxRequired | "In Spur, two-way become may involve making each pair of objects into a forwarder into a copy of the other. So if become fails with #'insufficient object memory', garbage collect, and if necessary, grow memory." maxRequired := (self detectSum: [:obj | obj class byteSizeOfInstanceOfSize: obj basicSize]) + (otherArray detectSum: [:obj | obj class byteSizeOfInstanceOfSize: obj basicSize]). (Smalltalk garbageCollectMost < maxRequired and: [Smalltalk garbageCollect < maxRequired]) ifTrue: [Smalltalk growMemoryByAtLeast: maxRequired]. ^self elementsExchangeIdentityWith: otherArray]. self primitiveFailed! Item was changed: ----- Method: Array>>elementsForwardIdentityAndHashTo: (in category 'converting') ----- elementsForwardIdentityAndHashTo: otherArray "This primitive performs a bulk mutation, causing all pointers to the elements of the receiver to be replaced by pointers to the corresponding elements of otherArray. The identityHashes remain with the pointers rather than with the objects so that the objects in this array should still be properly indexed in any existing hashed structures after the mutation." <primitive: 72 error: ec> ec == #'no modification' ifTrue: [^self modificationForbiddenFor: otherArray becomeSelector: #elementsForwardIdentityAndHashTo:]. ec == #'bad receiver' ifTrue: [^self error: 'receiver must be of class Array']. ec == #'bad argument' ifTrue: [^self error: (otherArray class == Array + ifFalse: ['arg must be of class Array'] + ifTrue: ['receiver and argument must have the same size'])]. - ifTrue: ['arg must be of class Array'] - ifFalse: ['receiver and argument must have the same size'])]. ec == #'inappropriate operation' ifTrue: [^self error: 'can''t become immediates such as SmallIntegers or Characters']. ec == #'object is pinned' ifTrue: [^self error: 'can''t become pinned objects']. ec == #'insufficient object memory' ifTrue: [self error: 'The virtual machine is out-of-date. Please upgrade.']. self primitiveFailed! Item was changed: ----- Method: Array>>elementsForwardIdentityTo: (in category 'converting') ----- elementsForwardIdentityTo: otherArray "This primitive performs a bulk mutation, causing all pointers to the elements of the receiver to be replaced by pointers to the corresponding elements of otherArray. The identityHashes are not copied to the target objects so that the objects in otherArray should still be properly indexed in any existing hashed structures after the mutation." <primitive: 248 error: ec> ec == #'no modification' ifTrue: [^self modificationForbiddenFor: otherArray becomeSelector: #elementsForwardIdentityTo:]. ec == #'bad receiver' ifTrue: [^self error: 'receiver must be of class Array']. ec == #'bad argument' ifTrue: [^self error: (otherArray class == Array + ifFalse: ['arg must be of class Array'] + ifTrue: ['receiver and argument must have the same size'])]. - ifTrue: ['arg must be of class Array'] - ifFalse: ['receiver and argument must have the same size'])]. ec == #'inappropriate operation' ifTrue: [^self error: 'can''t become immediates such as SmallIntegers or Characters']. ec == #'object is pinned' ifTrue: [^self error: 'can''t become pinned objects']. ec == #'insufficient object memory' ifTrue: [self error: 'The virtual machine is out-of-date. Please upgrade.']. self primitiveFailed! Item was changed: ----- Method: Array>>elementsForwardIdentityTo:copyHash: (in category 'converting') ----- elementsForwardIdentityTo: otherArray copyHash: copyHash "This primitive performs a bulk mutation, causing all pointers to the elements of the receiver to be replaced by pointers to the corresponding elements of otherArray. If copyHash is true, the identityHashes remain with the pointers rather than with the objects so that the objects in the receiver should still be properly indexed in any existing hashed structures after the mutation. If copyHash is false, then the hashes of the objects in otherArray remain unchanged. If you know what you're doing this may indeed be what you want." <primitive: 249 error: ec> ec == #'no modification' ifTrue: [^self modificationForbiddenFor: otherArray argument: copyHash becomeSelector: #elementsForwardIdentityTo:copyHash:]. ec == #'bad receiver' ifTrue: [^self error: 'receiver must be of class Array']. ec == #'bad argument' ifTrue: [^self error: (otherArray class == Array + ifFalse: ['arg must be of class Array'] + ifTrue: ['receiver and argument must have the same size'])]. - ifTrue: ['arg must be of class Array'] - ifFalse: ['receiver and argument must have the same size'])]. ec == #'inappropriate operation' ifTrue: [^self error: 'can''t become immediates such as SmallIntegers or Characters']. ec == #'object is pinned' ifTrue: [^self error: 'can''t become pinned objects']. self primitiveFailed!

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Squeak needs a third-party package updater
by Thiede, Christoph 14 Sep '20

14 Sep '20

Hi all, maybe I am missing some central Squeak tool, but I have never been happy with the current way to update all installed third-party packages in Squeak - because I don't know anyone. Please allow me to give you a short outline of the tool I would like to use for updating packages: There should be a simple button in the Squeak Menu, just below "Update image", named "Update packages", that enables you to install the latest versions of all installed packages for which a remote does exist. In addition, if I made any change to a package, it should be possible to merge the updates into my working copy. In particular, this does not only include Squeaksource packages but also packages from GitHub, BitBucket, etc. Great packages such as Autocompletion, MethodWrappers, Vivide, or Squot (see below) that are all hosted on GitHub and can be installed using a Metacello script. So how much of this is reality and how much is fiction today? For packages installed from Squeaksource, I can open them in the Monticello Browser and load or merge the latest version. At least, this works, but we could need a button to do this for all available packages where a "default remote" is selected. But for packages managed via git, this is not possible at all! The Monticello Browser does not know their remote repositories that were used to install the packages originally. Without extra settings made per repository baseline, you cannot even re-load a package again via the install script, see also this open issue: https://github.com/Metacello/metacello/issues/513 Meanwhile, I have made a habit of cloning all interesting projects via Squot in order to update them, even if I do not plan to commit to them ... I believe there is also something like SqueakMap which has an "Update" and an "Upgrade" button, but this tool is only made for accessing the Squeaksource, is this correct? From what I can see, Squeaksource and SqueakMap have become less important compared to GitHub (the reasons might include better visibility/explorability of projects, a more efficient VCS, and features like issues/pull requests; but that's probably not the point here). What do you think? Am I the only one facing this issue? How would a roadmap for such a tool look like? Looking forward to your ideas! :-) Best, Christoph

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The Inbox: System-dtl.1170.mcz
by commits＠source.squeak.org 14 Sep '20

14 Sep '20

A new version of System was added to project The Inbox: http://source.squeak.org/inbox/System-dtl.1170.mcz ==================== Summary ==================== Name: System-dtl.1170 Author: dtl Time: 12 September 2020, 2:52:23.835083 pm UUID: cdd6e922-e25e-433b-a516-c503d0a772a8 Ancestors: System-mt.1169 End of the #World as we know it. Package postscript only. About two years ago we eliminated all dependencies on global World. However, the global binding has remained functional on the theory that some external packages might still expect it. It is time to get rid of the binding now because: - It gives the false impressing that the World is still in use as a global - If a package is loaded that does need World, then "Smalltalk at: #World put: Project current world" will restore prior behavior. =============== Diff against System-mt.1169 =============== Item was changed: + (PackageInfo named: 'System') postscript: '"Global World is functional but no longer used in the image. Remove it now. If any package is loaded that requires the obsolete global binding, the prior behavior may be restored with: + + Smalltalk at: #World put: Project current world + " + + Smalltalk globals unbind: #World. + '! - (PackageInfo named: 'System') postscript: 'SystemNavigation initializeAuthors. "new: Tim Johnson (tcj)"'!

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Squeak on a PostmarketOS cellphone
by Tony Garnock-Jones 13 Sep '20

13 Sep '20

Hi all, I've recently been playing with Squeak running on a PostmarketOS phone (Samsung Galaxy S7). Many thanks to those who recently landed the ARMv8 build of Cog. (Per the commit history I think the main person responsible was Ken Dickey? Thanks Ken!) I wrote about progress so far here: https://eighty-twenty.org/2020/08/25/postmarketos-smalltalk Today I posted an update with a saner DPI setting for the phone's display: https://eighty-twenty.org/2020/08/27/squeak-postmarketos-update Next on the list is to read touchscreen input from /dev/input/event1! Cheers, Tony

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'1._FC_Tatran_PreÅ¡ov_managers' blowing up Seaside
by gettimothy 13 Sep '20

13 Sep '20

Hi folks, I am searching for way to detect that ''1._FC_Tatran_PreÅ¡ov_managers'' will blow up Seaside rendering. It is a WideString and I would just assume ignore it for now to render many other strings on my dev app. It displays differently in the workspace and inspectors than it does here. 'PreÅ¡ov' here is 'Pre(s with a bar over it)ov' in my image. Isolate that (s with a bar over it) it is Character: code 353 How would you attack detecting this in the WideString protocol? thx in advance.

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UK Smalltalk User Group meeting - Wednesday, August 26th
by Giovanni Corriga 13 Sep '20

13 Sep '20

The next meeting of the UK Smalltalk User Group will be on Wednesday, August 26th. In this meeting, Erik Stel will present his current project - CodeParadise. CodeParadise is a cloud based platform (to be) to learn to program using Object Oriented principles within a Smalltalk environment. CodeParadise is still in very early development, but some of its results have seen interest from the community. Therefore a presentation will provide insight in the design, current status, and possibilities of the results so far. The discussion afterwards can be used for both in-depth technical topics as well as the more philosophical topics about programming (as warmth and/or beer consumption will guide us). Given the current COVID-19 restrictions, this will be an online meeting from home. If you'd like to join us, please sign up in advance on the meeting's Meetup page https://www.meetup.com/UKSTUG/events/cbklbrybclbjc/ to receive the meeting details. Don’t forget to bring your laptop and drinks! Cheers, Giovanni

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Setting class instance variable nil...that's interesting
by gettimothy 12 Sep '20

12 Sep '20

Ignore if spam... It is interesting that I can reset a class instance variable inside one of the methods of a class with a doit. However, I cannot do it from a Workspace . TemplateTitleWords := nil from within the method area works (surprising, but very handy). WikitextTemplates TemplateTitleWords := nil. does not (as expected) I expect the latter, I am surprised by the former. Don't get me wrong, it is a handy feature , but if it is a bug, here is a heads up. cheers, tty

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The Trunk: Kernel-ul.1339.mcz
by commits＠source.squeak.org 12 Sep '20

12 Sep '20

Levente Uzonyi uploaded a new version of Kernel to project The Trunk: http://source.squeak.org/trunk/Kernel-ul.1339.mcz ==================== Summary ==================== Name: Kernel-ul.1339 Author: ul Time: 12 September 2020, 1:52:36.827997 pm UUID: 11d71615-1cc2-4e25-9ac8-d637679f3abd Ancestors: Kernel-ct.1338 - fixed Context >> #copyTo: which did not stop copying when aContext was reached - fixed a typo in SmallInteger >> #scaledIdentityHash's comment =============== Diff against Kernel-ct.1338 =============== Item was changed: ----- Method: Context>>copyTo: (in category 'query') ----- copyTo: aContext "Copy self and my sender chain down to, but not including, aContext. End of copied chain will have nil sender. Assume that there is no loop in the context chain." | currentContext senderContext copy | self == aContext ifTrue: [ ^nil ]. currentContext := copy := self copy. [ + senderContext := currentContext sender ifNil: [ ^copy ]. + senderContext == aContext ifTrue: [ + currentContext privSender: nil. + ^copy ]. + senderContext := senderContext copy. - senderContext := (currentContext sender ifNil: [ ^copy ]) copy. currentContext privSender: senderContext. currentContext := senderContext ] repeat! Item was changed: ----- Method: SmallInteger>>scaledIdentityHash (in category 'comparing') ----- scaledIdentityHash "For identityHash values returned by primitive 75, answer + such values times 2^8. Otherwise, match the existing - such values times 2^18. Otherwise, match the existing identityHash implementation" ^self!

1 0

Squeak on Ubuntu 18.04 desktop
by Chris Muller 12 Sep '20

12 Sep '20

Has anyone figured out how to get Squeak's behavior to behave in 18.04 like it did in 16.04 and before? In Ubuntu, Alt+~ (tilde) switches between windows of the same application. But, in 18.04, it no longer works. It treats every running instance of Squeak as a separate "app". It also won't re-top an existing window when using with a .desktop file. Nor will it let me anchor the .desktop file to the bar. Sigh, so Linux.. It makes working with multiple images at once nearly impossible.. Has anyone else encountered this? Thanks, Chris

5 6

Two new questions about VM machinery :-)
by Thiede, Christoph 11 Sep '20

11 Sep '20

Hi all, hi Eliot, just for curiosity, I have two new questions about the VM machinery (which are far away from praxis but close to my interests): 1. super on ProtoObject What would you expect the following to return? x := Compiler evaluate: 'super identityHash' for: ProtoObject new. thisContext objectClass: x. I would have guessed that either the VM crashes or ProtoObject >> #cannotInterpret: is called. But actually, it answers you the ProtoObject instance, which I find very interesting because it means that if a message cannot be looked up, it is simply and silently skipped. <http://www.hpi.de/> If you debug the call instead (Context class >> #runSimulated:), Context >> #send:to:with:lookupIn: raises a nil DNU error, which makes more sense but unfortunately is not consistent with the original VM behavior. Maybe the Compiler should forbid any call to super from ProtoObject instances at all (more formally: if the receiver's class's superclass is nil)? Or should we adjust the simulation code? (By the way: If you do the same in Squeak.js, you'll get an infinite recursion :D) 2. Mirror primitives What is the reason for primitives such as 75 (#identityHash) or 78/139 (#nextInstance/#nextObject) not being mirrored in Context? Was this simply forgotten, or don't we have the claim to mirror any "essential" primitive without it actually being needed by the simulation machinery? As always, looking forward to your interesting explanations! :-) Best, Christoph

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