[Vm-dev] Eliot, you did it! (was: new Cog VMs available)

[Eliot Miranda]

Hi Chris,


On Wed, Dec 19, 2012 at 12:39 PM, Chris Muller <asqueaker at gmail.com> wrote:

>
> For the first time ever, the Magma test suite passes on an Intel i7
> running Cog!  It ripped through them too about 15 minutes.  Solid as a
> rock, thank you so much!
>

Good.  This was an old, old bug that has been there since the beginning.
 The 2640 VMs also revert my mistake with primitiveChangeClassTo:.


> In the app I did still encounter the intermittent problem with an
> object which had had its class changed via #primitiveChangeClassTo:.
> The notes for 2639 looked like it had a chance to address that -- I'll
> try that one when it becomes available.
>
> Thanks again Eliot.
>
>
> On Sat, Dec 15, 2012 at 6:00 PM, Eliot Miranda <eliot.miranda at gmail.com>
> wrote:
> >
> > Hi All,
> >
> >     new Cog VMs available at
> http://www.mirandabanda.org/files/Cog/VM/VM.r2636/.  The main change here
> is to do with corrected headroom and safer signal handling which should
> hopefully improve stability on linux.
> >
> > Cog VM binaries as per VMMaker.oscog-eem.234/r2636/r2638.
> >
> > Use the -z now link flag on the linux builds.  This causes the dynamic
> linker
> > to resolve unresolved symbols on load instead of lazily.  This affects
> > reliability in signal handlers, because if the dynamic linker can run at
> any
> > time it can therefore run in a signal handler and cause a deep call
> chain which
> > could corrupt a stack page in the JIT.
> > So this aplies three fixes to this issue:
> >       a) correct the stack headroom determination
> >       b) use sigaltstack for signal handlers in the UnixOSProcessPlugin
> >       c) link using -z now on linux.
> >
> > Use SA_ONSTACK/sigaltstack for signal handlers installed by the
> > UnixOSProcessPlugin to avoid running signal handlers on the JIT's stack.
> > (r2638: Check for needing sigaltstack properly in
> setSignalNumber:handler:).
> >
> > ====
> > VMMaker.oscog-eem.233/r2632
> >
> > Rename misnamed internalIsMutable: and internalIsImmutable:
> > to isOopMutable: and isOopImmutable:.  Affects sqVirtualMachine.c,
> > but only part of api used in Newspeak VMs.
> >
> > Merge LargeInteger primitive fixes from VMMaker-dtl.286 and
> > tests from VMMaker-dtl.289.
> >
> > UnixOSProcessPlugin:
> > Merge with VMConstruction-Plugins-OSProcessPlugin-dtl.35.
> > In particular restore missing code to forwardSignal:toSemaphoreAt:
> >
> > Get plugin to use SA_ONSTACK/sigaltstack for signal handlers
> > if loaded in the JIT.
> >
> > ====
> > VMMaker.oscog-eem.230/r2631
> >
> > Fix stackPage headroom calculation in CoInterpreter.  Was getting
> > things backward.  This increases the stack page headroom by 62%
> > from 1564 bytes to 2532 bytes.  Shootout benchmarks unchanged,
> > so reduction in frames per page is not an issue for typical code.
> >
> > This should result in fewer crashes on linux where the dynamic
> > linker, if it kicked in during a signal handler, could cause a deep
> > call chain at interrupt time and trample the start of the adjoining
> > stack page.
> >
> > Merge LargeInteger primitive fixes from VMMaker-dtl.286.
> >
> > Change generation of plugin code so that internal plugins call VM
> > routines directly and external plugins call through their own local
> > copies of the function pointers in InterpreterProxy.  External plugins
> > copy the InterpreterProxy functions to their local copies in
> > setInterpreter:.
> >
> > Change implementations of stObject:at:put: to return their value, to
> > match the declaration in InterpreterProxy.
> >
> > Streamline ObjectMemory>>instantiateClass:indexableSize: (hdrSize
> > and header3 change together).
> >
> > Optimize the debug VM by making startOfMemory a macro that
> > answers heapBase instead of a method.
> >
> > Improve stack page printing, and make stack trace printing more
> > robust (findClass/SelectorOfMethod:forReceiver:).
> >
> > Make temporary:in:put: et al answer their values. For stObject:at:put:.
> >
> > Make jumpTable size err message more explanatory.
> >
> > Rename misnamed internameIsMutable: and internalIsImmutable:
> > to isOopMutable: and isOopImmutable:.  Affects sqVirtualMachine.c,
> >
> > but only part of api used in Newspeak VMs.--
> > best,
> > Eliot
> >
> >
>



-- 
best,
Eliot
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