Vm-dev December 2020

vm-dev@lists.squeakfoundation.org

19 participants
80 discussions

Smalltalk Zoo: 48 Years of Smalltalk History at CHM
by Vanessa Freudenberg 18 Dec '20

18 Dec '20

> > In commemoration of the 40th anniversary of the release of Smalltalk-80, > the Computer History Museum is proud to announce a collaboration with Dan > Ingalls to preserve and host the “Smalltalk Zoo.” Dan has been working on this for a good while now. I helped with the SqueakJS part. Today the Computer History Museum announced it: https://computerhistory.org/blog/introducing-the-smalltalk-zoo-48-years-of-… Not everything is working perfectly yet. If you want to help out, I can put you in touch with Dan. Cheers! Vanessa

1 0

[OpenSmalltalk/opensmalltalk-vm] 5431a1: MacOS:
by Eliot Miranda 18 Dec '20

18 Dec '20

Branch: refs/heads/Cog Home: https://github.com/OpenSmalltalk/opensmalltalk-vm Commit: 5431a13d1ef2b3f37b0527405d9e771693d02ff1 https://github.com/OpenSmalltalk/opensmalltalk-vm/commit/5431a13d1ef2b3f37b… Author: Eliot Miranda <eliot.miranda(a)gmail.com> Date: 2020-12-17 (Thu, 17 Dec 2020) Changed paths: M build.macos64ARMv8/common/Makefile.flags M build.macos64ARMv8/common/Makefile.vm M build.macos64ARMv8/common/entitlements.plist M build.macos64x64/common/Makefile.flags M build.macos64x64/common/Makefile.vm Log Message: ----------- MacOS: Copy changes to the ARMv8 build, and clean-up to reduce extraneous diffs. [ci skip]

1 0

[OpenSmalltalk/opensmalltalk-vm] 912e76: MacOS:
by Eliot Miranda 18 Dec '20

18 Dec '20

Branch: refs/heads/Cog Home: https://github.com/OpenSmalltalk/opensmalltalk-vm Commit: 912e763a1c49692ccb53faddfa0c42737c258879 https://github.com/OpenSmalltalk/opensmalltalk-vm/commit/912e763a1c49692ccb… Author: Eliot Miranda <eliot.miranda(a)gmail.com> Date: 2020-12-17 (Thu, 17 Dec 2020) Changed paths: M build.macos64x64/common/Makefile.flags M build.macos64x64/common/Makefile.vm M build.macos64x64/common/entitlements.plist M platforms/iOS/plugins/CameraPlugin/AVFoundationVideoGrabber.m M platforms/iOS/plugins/SoundPlugin/sqSqueakSoundCoreAudio.m M platforms/iOS/vm/OSX/Squeak-Info.plist Log Message: ----------- MacOS: Add entitlements for camera and microphone access for Big Sur. Add the code to request permission from the user. This is only compilable on 10.14 SDKs and subsequent, so the code is guarded and not included if compiled with an earlier SDK. Hence add AVFoundation to the base VM's frameworks; the auth code is defined here-in. Make sure TARGET_MIN_VERSION is passed to plugin makes. Correct a slip in the microphone entitlement usage string in the plist. [ci skip]

1 0

Method header 64 vs 32 bits
by Vanessa Freudenberg 18 Dec '20

18 Dec '20

Hi Eliot / Clément / everyone, how do I properly convert a 64 bit method header word to 32 bits? E.g. if in 64 bits I have 0x8000000000000049 my guess it would be 0x80000049 in 32 bits, but which bits should I actually drop? Thanks! Vanessa

2 2

VM Maker: VMMaker.oscog-eem.2886.mcz
by commits＠source.squeak.org 16 Dec '20

16 Dec '20

Eliot Miranda uploaded a new version of VMMaker to project VM Maker: http://source.squeak.org/VMMaker/VMMaker.oscog-eem.2886.mcz ==================== Summary ==================== Name: VMMaker.oscog-eem.2886 Author: eem Time: 15 November 2020, 11:27:11.64449 pm UUID: 78490b88-d959-40aa-9436-2b640bb0ecc6 Ancestors: VMMaker.oscog-eem.2885 Oops. Forgot to revert a method necessary to make the previous commit compile. =============== Diff against VMMaker.oscog-eem.2885 ===============

1 0

Postdoc Position and PhD Studentship for Programming Language Implementation Research at the University of Kent
by Stefan Marr 16 Dec '20

16 Dec '20

We are seeking to appoint a qualified and highly motivated researcher to work as a Research Associate (Postdoc) as well as a PhD student. You will work on a project titled “CaMELot: Catching and Mitigating Event-Loop Concurrency Issues”, which is funded by an EPSRC UK grant and is led by Dr Stefan Marr. Job description / Additional Information / Please apply at: Postdoc Closing Date: 17 January 2021 https://jobs.kent.ac.uk/Vacancy.aspx?ref=CEMS-005-20 PhD studentship Closing Date: 13 January 2021 https://www.jobs.ac.uk/job/CCY406/phd-studentship-catching-and-mitigating-e… Modern server applications utilize concurrency in many ways. Actors and event loops are popular as programming paradigms since they avoid low-level concurrency issues. Unfortunately, even when using actors or event loops, server applications still show other types of concurrency bugs. Though, they can be mitigated with run-time detection techniques. In the CaMELot project, we want to make detection and mitigation fast enough to be usable in production systems. This way, even though software may contain bugs, we can reduce their impact on correct execution. Building on a system for deterministic replay of actor applications, you would investigate how one can use lightweight race detection to facilitate debugging of the underlying concurrency issues. Afterall, if we can detect the issues, we should help developers to fix them! One of the challenges here is to derive actionable insights from the detected races. A tool processing the race detection results may guide developers to fix the underlying issues, possibly replaying the problematic execution for the developers. For more details, please email me (s.marr(a)kent.ac.uk) or see the links above. When joining the project, you’ll also be an active member of the Programming Languages and Systems (PLAS) research group. PLAS spans the breadth and depth of practical and theoretical aspects of programming languages and system building related to languages. Our work goes across paradigms (imperative, object-oriented, functional, logic) and is complemented by our systems research in concurrency, relaxed memory, verified compilation, verification, language prototypes, garbage collection, and tools. All our work is linked by a shared vision of the power and impact of programming languages on the rest of Computer Science. The PLAS group at Kent has a long history of contributions to the field and continues to be a hotbed of programming language research in the South East of England: https://www.cs.kent.ac.uk/research/groups/plas/index.html The School of Computing [1] is a welcoming, supportive, and diverse environment whose commitment to gender equality has been recognised with a Bronze Athena SWAN [2] award. We are keen to enhance the balanced, inclusive and diverse nature of the community within our School and would particularly encourage female candidates to apply for these posts. The University of Kent campus overlooks the city centre of Canterbury, and with 125 nationalities represented, it has a very cosmopolitan feel. Canterbury is a small city that retains parts of its medieval walls (with Roman foundations). Famous for its heritage (Canterbury Cathedral; Chaucer’s Tales; etc), Canterbury is a vibrant community and UNESCO World Heritage site whose culture and leisure facilities are enhanced by hosting three universities. The city and surrounding region combines an attractive and affordable environment, excellent schools, and fast transport links to London and mainland Europe. Links: [1] https://cs.kent.ac.uk/ [2] http://www.ecu.ac.uk/equality-charters/athena-swan/ -- Stefan Marr School of Computing, University of Kent https://stefan-marr.de/research/

1 0

MoreVMs 2021 : Workshop on Modern Language Runtimes, Ecosystems, and VMs
by Fabio Niephaus 16 Dec '20

16 Dec '20

============================================================================ Call for Extended Abstracts and Talks: MoreVMs’21 5th International Workshop on Modern Language Runtimes, Ecosystems, and VMs Co-located with ‹Programming›’21 March 22nd to 26th, 2021, Online, United Kingdom https://2021.programming-conference.org/home/MoreVMs-2021 ============================================================================ Following four previous successful editions, the MoreVMs’21 workshop aims to bring together industrial and academic programmers to discuss the design, implementation, and usage of modern languages and runtimes. This includes aspects such as reuse of language runtimes, modular implementation, language design, and compilation strategies. By bringing together both researchers and practitioners, the workshop aims to enable a diverse discussion on how languages and runtimes are currently being utilized, and where they need to improve further. In addition to conventional workshop-style submissions, MoreVMs also accepts (and encourages) submissions that present early-stage work and emerging ideas. Relevant topics include, but are definitely not limited to, the following: - Extensible VM design (compiler- or interpreter-based VMs) - Reusable components (e.g. interpreters, garbage collectors, ...) - Static and dynamic compilation techniques - Techniques for targeting high-level languages such as JavaScript - Interoperability between languages - Tooling support (e.g. debugging, profiling, etc.) - Programming language development environments - Case studies of existing language implementation approaches - Language implementation challenges and trade-offs - Surveys and usage reports to understand usage in the wild - Ideas for more predictable performance - Ideas for how VMs could take advantage of new hardware features - Ideas for how we should build languages in the future Workshop Format and Submissions ------------------------------- We welcome presentation proposals in the form of extended abstracts (2 to 4 pages long) and talk proposals (title and 400 words abstract) discussing new techniques, insights, experiences, works-in-progress, as well as future visions, from either an academic or industrial perspective. The extended abstracts and talk proposals, and if the speakers wish, their slides, will be published on the workshop's website. Alternatively, extended abstracts can be published as part of the companion of ‹Programming›’21 in the ACM DL. Publication in the ACM DL is conditional on the acceptance by the program committee. Please note that MoreVMs’21 is organized as an academic workshop, and as such, speakers will be required to register for the workshop. Author Instructions ------------------- Submissions should use the ACM `acmart` format: https://www.acm.org/publications/proceedings-template If you are using LaTeX, submissions should use the 'acmart' document class with the 'sigconf' option, and with a font size of 9 point. Please use the Libertine/Biolinum font family. Please include page numbers in your submission using the LaTeX command `\settopmatter{printfolios=true}`. All submissions should be in PDF format. Please also ensure that your submission is legible when printed on a black and white printer. In particular, please check that colors remain distinct and font sizes are legible. Submission Site: https://easychair.org/conferences/?conf=morevms21 Important Dates --------------- Extended abstract and talk submissions: 2021-01-13 Author notification: 2021-02-15 Camera Ready: 2021-02-26 Workshop: TBA (between 2021-03-22 and 2021-03-26) All deadlines are Anywhere on Earth (AoE), i.e. GMT/UTC-12:00 hour. Program Committee ----------------- Maya Armyanova, Google, Germany Maxime Chevalier-Boisvert, Université de Montréal, Canada Lukas Diekmann, King's College London, United Kingdom Charlie Gracie, Microsoft, Canada Daco Harkes, Google, Denmark Christian Humer, Oracle Labs, Switzerland Sophie Kaleba, University of Kent, United Kingdom Mikel Luján, University of Manchester, United Kingdom Ana Milanova, Rensselaer Polytechnic Institute, United States Tobias Pape, Hasso Plattner Institute, University of Potsdam, Germany Tomoharu Ugawa, University of Tokyo, Japan Organizers ---------- Fabio Niephaus, Hasso Plattner Institute, University of Potsdam, Germany David Leopoldseder, Oracle Labs, Austria

1 0

MPEG3Plugin code appears broken when generated?
by tim Rowledge 16 Dec '20

16 Dec '20

Is anybody else doing anything with MP3 files? It looks like we haven't included any image-side support for them for several releases now (I've look back to 4.5) but it is/was working just fine for the work I did on Pi Scratch. That was, admittedly, quite a while ago. In the current system I can load much of Scratch without too many issues - sounds are really messed up in various places, some morph building is broken etc - but today I'm trying to see why mp3 sounds don't. It seems that the code for the src/plugins/Mpeg3Plugin.c is broken. The autogenerated checks for the types of the arguments is insisting that be indexable pointers, when is is in fact a variable word array. That at least explains why the prim fails, which is at least a step forward. Current code on opensmalltalk git - /* int mpeg3_read_audio(mpeg3_t *file, float *output_f, short *output_i, int channel, long samples, int stream) */ /* Mpeg3Plugin>>#primitiveMPEG3ReadAudio:shortArray:channel:samples:stream: */ EXPORT(sqInt) primitiveMPEG3ReadAudio(void) { sqInt aChannelNumber; sqInt aNumber; sqInt *anArray; short *arrayBase; sqInt aSampleNumber; mpeg3_t *file; sqInt fileHandle; sqInt result; result = 0; if (!(((isPointers(stackValue(3))) && (isIndexable(stackValue(3)))) && ((isIntegerObject((aChannelNumber = stackValue(2)))) && ((isIntegerObject((aSampleNumber = stackValue(1)))) && (isIntegerObject((aNumber = stackValue(0)))))))) { primitiveFailFor(PrimErrBadArgument); return null; } The two interesting things I have remaining energy to point out today - The Slang does explicitly and wrongly declare it as self primitive: 'primitiveMPEG3ReadAudio' parameters: #(Oop Array SmallInteger SmallInteger SmallInteger). .. which clearly doesn't help. It has, however, been that way since 2006. And the old C file from Back Then has result = 0; fileHandle = stackValue(4); success(isIndexable(stackValue(3))); anArray = ((sqInt *) (firstIndexableField(stackValue(3)))); aChannelNumber = stackIntegerValue(2); aSampleNumber = stackIntegerValue(1); aNumber = stackIntegerValue(0); if (failed()) { return null; } .. and so it makes kinda sense why it worked Back Then. Thus I am inclined (and not just because I'm falling asleep) to think that some change in how the prologue stuff is generated might have started to note the Array declaration and become more zealous. More when awake. tim -- tim Rowledge; tim(a)rowledge.org; http://www.rowledge.org/tim Strange OpCodes: STOP: No Op

3 7

Build failed: opensmalltalk-vm 1.0.2328
by AppVeyor 15 Dec '20

15 Dec '20

1 0

[OpenSmalltalk/opensmalltalk-vm] 73ed9e: CogVM source as per VMMaker.oscog-tpr.2906
by Eliot Miranda 15 Dec '20

15 Dec '20

Branch: refs/heads/Cog Home: https://github.com/OpenSmalltalk/opensmalltalk-vm Commit: 73ed9e41c227f41c9e96631d4ee55feb91f69f35 https://github.com/OpenSmalltalk/opensmalltalk-vm/commit/73ed9e41c227f41c9e… Author: Eliot Miranda <eliot.miranda(a)gmail.com> Date: 2020-12-14 (Mon, 14 Dec 2020) Changed paths: M src/plugins/Mpeg3Plugin/Mpeg3Plugin.c Log Message: ----------- CogVM source as per VMMaker.oscog-tpr.2906 Mpeg3Plugin sample read routines must expect word arrays, not pointer arrays. Became an issue recently due to Slang changes?

1 0

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

Vm-dev December 2020