Vm-dev June 2020

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23 participants
106 discussions

Interesting discussion about a Intel Skylake performance regression with the PAUSE instruction
by Bruce O'Neel 14 Jun '20

14 Jun '20

Skylake takes PAUSE about 10 times more seriously then did previous Intel CPUs. Surprises happen.. [https://aloiskraus.wordpress.com/2018/06/16/why-skylakex-cpus-are-sometimes…

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Errored: OpenSmalltalk/opensmalltalk-vm#2090 (Cog - cedc9cd)
by Travis CI 13 Jun '20

13 Jun '20

Build Update for OpenSmalltalk/opensmalltalk-vm ------------------------------------- Build: #2090 Status: Errored Duration: 19 mins and 10 secs Commit: cedc9cd (Cog) Author: Eliot Miranda Message: CLeanups to sqNamedPrims.c and sqCogStackAlignment.h View the changeset: https://github.com/OpenSmalltalk/opensmalltalk-vm/compare/07161bcb145b...ce… View the full build log and details: https://travis-ci.org/github/OpenSmalltalk/opensmalltalk-vm/builds/69806495… -- You can unsubscribe from build emails from the OpenSmalltalk/opensmalltalk-vm repository going to https://travis-ci.org/account/preferences/unsubscribe?repository=8795279&ut…. Or unsubscribe from *all* email updating your settings at https://travis-ci.org/account/preferences/unsubscribe?utm_medium=notificati…. Or configure specific recipients for build notifications in your .travis.yml file. See https://docs.travis-ci.com/user/notifications.

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[OpenSmalltalk/opensmalltalk-vm] cedc9c: CLeanups to sqNamedPrims.c and sqCogStackAlignment.h
by Eliot Miranda 13 Jun '20

13 Jun '20

Branch: refs/heads/Cog Home: https://github.com/OpenSmalltalk/opensmalltalk-vm Commit: cedc9cdd5769846b3d57cbad475ac6bed8d3fb7e https://github.com/OpenSmalltalk/opensmalltalk-vm/commit/cedc9cdd5769846b3d… Author: Eliot Miranda <eliot.miranda(a)gmail.com> Date: 2020-06-13 (Sat, 13 Jun 2020) Changed paths: M platforms/Cross/vm/sqCogStackAlignment.h M platforms/Cross/vm/sqNamedPrims.c Log Message: ----------- CLeanups to sqNamedPrims.c and sqCogStackAlignment.h

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Errored: OpenSmalltalk/opensmalltalk-vm#2089 (Cog - 07161bc)
by Travis CI 13 Jun '20

13 Jun '20

Build Update for OpenSmalltalk/opensmalltalk-vm ------------------------------------- Build: #2089 Status: Errored Duration: 30 mins and 42 secs Commit: 07161bc (Cog) Author: Nicolas Cellier Message: Merge pull request #501 from marceltaeumel/marceltaeumel/patch-3 Removes support for NSPlugin and browser mode on win32 View the changeset: https://github.com/OpenSmalltalk/opensmalltalk-vm/compare/d716e763adc2...07… View the full build log and details: https://travis-ci.org/github/OpenSmalltalk/opensmalltalk-vm/builds/69800852… -- You can unsubscribe from build emails from the OpenSmalltalk/opensmalltalk-vm repository going to https://travis-ci.org/account/preferences/unsubscribe?repository=8795279&ut…. Or unsubscribe from *all* email updating your settings at https://travis-ci.org/account/preferences/unsubscribe?utm_medium=notificati…. Or configure specific recipients for build notifications in your .travis.yml file. See https://docs.travis-ci.com/user/notifications.

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Errored: OpenSmalltalk/opensmalltalk-vm#2088 (Cog - d716e76)
by Travis CI 13 Jun '20

13 Jun '20

Build Update for OpenSmalltalk/opensmalltalk-vm ------------------------------------- Build: #2088 Status: Errored Duration: 19 mins and 12 secs Commit: d716e76 (Cog) Author: Nicolas Cellier Message: Merge pull request #503 from marceltaeumel/marceltaeumel/patch-2 Removes USE_DIB_SECTIONS as part of Windows CE removal View the changeset: https://github.com/OpenSmalltalk/opensmalltalk-vm/compare/7a6fcd00dea6...d7… View the full build log and details: https://travis-ci.org/github/OpenSmalltalk/opensmalltalk-vm/builds/69800772… -- You can unsubscribe from build emails from the OpenSmalltalk/opensmalltalk-vm repository going to https://travis-ci.org/account/preferences/unsubscribe?repository=8795279&ut…. Or unsubscribe from *all* email updating your settings at https://travis-ci.org/account/preferences/unsubscribe?utm_medium=notificati…. Or configure specific recipients for build notifications in your .travis.yml file. See https://docs.travis-ci.com/user/notifications.

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[OpenSmalltalk/opensmalltalk-vm] Removes support for NSPlugin and browser mode on win32 (#501)
by Marcel Taeumel 13 Jun '20

13 Jun '20

The command line arguments "browserWindow" and "browserWindow:" are no longer recognized. For a discussion, see http://forum.world.st/Supporting-fBrowserMode-on-Windows-td5116489.html You can view, comment on, or merge this pull request online at: https://github.com/OpenSmalltalk/opensmalltalk-vm/pull/501 -- Commit Summary -- * Removes support for NSPlugin and browser mode on win32 -- File Changes -- M platforms/win32/plugins/DropPlugin/sqWin32Drop.c (4) M platforms/win32/vm/sqWin32.h (8) M platforms/win32/vm/sqWin32Main.c (25) M platforms/win32/vm/sqWin32PluginSupport.c (510) M platforms/win32/vm/sqWin32Window.c (128) -- Patch Links -- https://github.com/OpenSmalltalk/opensmalltalk-vm/pull/501.patch https://github.com/OpenSmalltalk/opensmalltalk-vm/pull/501.diff -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/OpenSmalltalk/opensmalltalk-vm/pull/501

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[OpenSmalltalk/opensmalltalk-vm] 91fe58: Removes support for NSPlugin and browser mode on w...
by Nicolas Cellier 13 Jun '20

13 Jun '20

Branch: refs/heads/Cog Home: https://github.com/OpenSmalltalk/opensmalltalk-vm Commit: 91fe58cd39689190d87714681f0ee614b3207d34 https://github.com/OpenSmalltalk/opensmalltalk-vm/commit/91fe58cd39689190d8… Author: Marcel Taeumel <marcel.taeumel(a)hpi.de> Date: 2020-05-12 (Tue, 12 May 2020) Changed paths: M platforms/win32/plugins/DropPlugin/sqWin32Drop.c M platforms/win32/vm/sqWin32.h M platforms/win32/vm/sqWin32Main.c M platforms/win32/vm/sqWin32PluginSupport.c M platforms/win32/vm/sqWin32Window.c Log Message: ----------- Removes support for NSPlugin and browser mode on win32 The command line arguments "browserWindow" and "browserWindow:" are no longer recognized. For a discussion, see http://forum.world.st/Supporting-fBrowserMode-on-Windows-td5116489.html Commit: 39670caf940acef095606ad3adfafdd5c74f60f2 https://github.com/OpenSmalltalk/opensmalltalk-vm/commit/39670caf940acef095… Author: Marcel Taeumel <marcel.taeumel(a)hpi.de> Date: 2020-05-13 (Wed, 13 May 2020) Changed paths: M platforms/win32/vm/sqConfig.h M platforms/win32/vm/sqWin32.h M platforms/win32/vm/sqWin32Directory.c M platforms/win32/vm/sqWin32Heartbeat.c M platforms/win32/vm/sqWin32Time.c M platforms/win32/vm/sqWin32Window.c Log Message: ----------- Merge branch 'Cog' into marceltaeumel/patch-3 Commit: 07161bcb145bc4c6b08c617df2c708e3a94597b6 https://github.com/OpenSmalltalk/opensmalltalk-vm/commit/07161bcb145bc4c6b0… Author: Nicolas Cellier <nicolas.cellier.aka.nice(a)gmail.com> Date: 2020-06-13 (Sat, 13 Jun 2020) Changed paths: M platforms/win32/plugins/DropPlugin/sqWin32Drop.c M platforms/win32/vm/sqWin32.h M platforms/win32/vm/sqWin32Main.c M platforms/win32/vm/sqWin32PluginSupport.c M platforms/win32/vm/sqWin32Window.c Log Message: ----------- Merge pull request #501 from marceltaeumel/marceltaeumel/patch-3 Removes support for NSPlugin and browser mode on win32 Compare: https://github.com/OpenSmalltalk/opensmalltalk-vm/compare/d716e763adc2...07…

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[OpenSmalltalk/opensmalltalk-vm] Removes USE_DIB_SECTIONS as part of Windows CE removal (#503)
by Marcel Taeumel 13 Jun '20

13 Jun '20

You can view, comment on, or merge this pull request online at: https://github.com/OpenSmalltalk/opensmalltalk-vm/pull/503 -- Commit Summary -- * Removes USE_DIB_SECTIONS as part of Windows CE removal * Removes comment about "NT vs CE" bc. not meaningful anymore. -- File Changes -- M platforms/win32/misc/Makefile.mingw32 (1) M platforms/win32/vm/sqWin32.h (2) M platforms/win32/vm/sqWin32Window.c (98) -- Patch Links -- https://github.com/OpenSmalltalk/opensmalltalk-vm/pull/503.patch https://github.com/OpenSmalltalk/opensmalltalk-vm/pull/503.diff -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/OpenSmalltalk/opensmalltalk-vm/pull/503

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[OpenSmalltalk/opensmalltalk-vm] 7b1454: Removes USE_DIB_SECTIONS as part of Windows CE rem...
by Nicolas Cellier 13 Jun '20

13 Jun '20

Branch: refs/heads/Cog Home: https://github.com/OpenSmalltalk/opensmalltalk-vm Commit: 7b1454682e579b0bb76e804ccaadc116e3b3d30d https://github.com/OpenSmalltalk/opensmalltalk-vm/commit/7b1454682e579b0bb7… Author: Marcel Taeumel <marcel.taeumel(a)hpi.de> Date: 2020-05-17 (Sun, 17 May 2020) Changed paths: M platforms/win32/misc/Makefile.mingw32 M platforms/win32/vm/sqWin32Window.c Log Message: ----------- Removes USE_DIB_SECTIONS as part of Windows CE removal See https://docs.microsoft.com/en-us/windows/win32/api/wingdi/ns-wingdi-dibsect… Commit: 59012bc247014da99a15a6c4de09da28413def97 https://github.com/OpenSmalltalk/opensmalltalk-vm/commit/59012bc247014da99a… Author: Marcel Taeumel <marcel.taeumel(a)hpi.de> Date: 2020-05-17 (Sun, 17 May 2020) Changed paths: M platforms/win32/vm/sqWin32.h Log Message: ----------- Removes comment about "NT vs CE" bc. not meaningful anymore. Commit: d716e763adc22471f312fecef0c31fc226088744 https://github.com/OpenSmalltalk/opensmalltalk-vm/commit/d716e763adc22471f3… Author: Nicolas Cellier <nicolas.cellier.aka.nice(a)gmail.com> Date: 2020-06-13 (Sat, 13 Jun 2020) Changed paths: M platforms/win32/misc/Makefile.mingw32 M platforms/win32/vm/sqWin32.h M platforms/win32/vm/sqWin32Window.c Log Message: ----------- Merge pull request #503 from marceltaeumel/marceltaeumel/patch-2 Removes USE_DIB_SECTIONS as part of Windows CE removal Compare: https://github.com/OpenSmalltalk/opensmalltalk-vm/compare/7a6fcd00dea6...d7…

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Compiling with Continuations and LLVM
by Ben Coman 12 Jun '20

12 Jun '20

Could Smalltalk VM be defined as a "Continuation Passing Style", or is that still more the realm of more functional languages? I vaguely remember one of the arguments against using LLVM is that its IR was Single Static Assignment that wasn't well suited for continuations and non-local returns. I bumped into the following article... "Compiling with Continuations and LLVM" https://arxiv.org/pdf/1805.08842.pdf ...and wondered if it addresses any of those concerns, and refresh myself on other impediments to making use of the code-optimisation parts of LLVM. A few extracts... While LLVM provides a relatively easy path to high-quality native code, its design is based on a traditional runtime model which is not well suited to alternative compilation strategies used in high-level language compilers, such as the use of heap-allocated continuation closures. This paper describes a new LLVM-based backend that supports heap-allocated continuation closures, which enables constant-time callcc and very-lightweight multithreading. ... The LLVM backend for the MLton SML compiler uses trampolining to avoid the issues with TCO [23]. As far as we know, no one has successfully implemented heap-allocated first-class continuations with LLVM. In the remainder of the paper, we describe a new calling convention that we have added to LLVM, how we handle the GC interface, and how we support capturing continuations to support preemption ... In preparation for generating native code that uses bump allocation in the heap, we insert heap-limit tests into the CFG representation. [...] The limit tests introduce continuation captures that are not present in the original program, which can be used to implement preemptive scheduling ... Most functional languages use tail recursion to express loops and, thus, require that tail calls do not grow the stack. In limited circumstances, LLVM can meet this requirement, but even when LLVM is able to apply TCO to a call, there is extra stack-management overhead on function entry and exit. This extra overhead is bad enough for implementations that rely on traditional stacks, but it is prohibitively expensive for implementations that use CPS and heap-allocated continuations. [...] Our solution to this problem is to add a new calling convention, which we call Jump-With-Arguments (JWA), to LLVM. This calling convention has the property that it uses all of the available hardware registers and that no registers are preserved by either the caller or callee. [...] we mark every function with the naked attribute, which tells the code generator to completely skip the emission of a function prologue and epilogue [This sounds a bit like how our VM works...] We use the technique developed for supporting asynchronous signals in SML/NJ [26], which limits preemption to safe points where all live values are known. We store the heap limit pointer in memory, which means that we can set it to zero when we need to force a heap-limit check to fail. Cheers, Ben

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Vm-dev June 2020