[squeak-dev] new Cog VMs available

Frank Shearar frank.shearar at gmail.com
Tue Mar 12 10:19:41 UTC 2013

On 12 March 2013 00:53, Eliot Miranda <eliot.miranda at gmail.com> wrote:
> at http://www.mirandabanda.org/files/Cog/VM/VM.r2701/.
> CogVM binaries as per VMMaker.oscog-eem.272/r2701.
> Fix unknownBytecode processing to leave pc at unknown bytecode.
> Fix case of process switch to an interior frame.
> Fix some assert function signatures in the stack vm.
> Use symbols for types instead of strings in stack page funcs.
> Fix the become issue where methods that are identical are failing
> the code test because their penultimate literals are different objects.
> Add a flag "cmUsesPenultimateLit" to jitted methods, stealing bits
> from stackCheckOffset (which was way larger than needed).
> Shrink stackCheckOffset to 12 bits (still an order of magnitude larger
> than needed) and add an error check on assigning it.
> Also add a check for max method size (2^16-1 bytes) and refuse to
> jit a method that generates too much code.
> When comparing code, use the cmUsesPenultimateLit flag to decide
> if comparison includes penultimate lit or not.
> This is mildly insane, but the VM really doesn't know about the
> penultimate literal and it shouldn't depend on knowing it can be
> ignored.  Note that the CoInterpreter knows about the last literal;
> it uses this in supersends.  With this hack, Pharo's condenseSources
> works.

CI jobs duly updated.


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