[webkit-dev] [jsc-dev] Question about ARMv7 JIT maintenance by Apple

[Yusuke SUZUKI]

On Wed, May 9, 2018 at 6:46 AM Michael Saboff <msaboff at apple.com> wrote:

> Yusuke,
>
> What are the deficiencies you see in the current ARMv7 disassembler?
>

This is just removing some code in WebKit tree. Basically there is no
functionality difference.
Currently, MIPS and ARM use capstone disassembler. If we can use this for
ARMv7, it simplifies the implementation.

I don't want to use capstone for X86, X86_64, and ARM64 right now since
these instruction sets are really changing: new instructions are added
frequently.
So I would like to have our own ones in the tree. But for MIPS, ARM and
ARMv7, instruction sets are not so changed in terms of our JIT.

Best regards,
Yusuke Suzuki


>
> - Michael
>
> On May 4, 2018, at 7:45 PM, Yusuke SUZUKI <utatane.tea at gmail.com> wrote:
>
> On Sat, May 5, 2018 at 11:27 AM Filip Pizlo <fpizlo at apple.com> wrote:
>
>> We aren’t maintaining armv7.
>>
>
> OK, thanks. I'll replace ARMv7 disassembler with capstone based one once
> capstone is adopted :)
>
>
>
>>
>> -Filip
>>
>> > On May 4, 2018, at 7:01 PM, Yusuke SUZUKI <utatane.tea at gmail.com>
>> wrote:
>> >
>> > Hi WebKittens,
>> >
>> > JSC has X86, X86_64, ARM64, ARM, ARMv7, and MIPS JIT architectures.
>> > While X86, X86_64, and ARM64 is maintained by build bots configured by
>> Apple,
>> > the other architectures are maintained by the community.
>> >
>> > Recently, I'm about to adopting capstone disassembler for MIPS and ARM.
>> > And I'm also wondering if ARMv7 can use it instead of our own
>> disassembler.
>> >
>> > So my question is, is ARMv7 JIT maintained by Apple right now? Or is it
>> maintained by the community?
>> > If Apple does not maintain it right now, I would like to drop ARMv7
>> disassembler and use capstone instead.
>> >
>> > Best regards,
>> > Yusuke Suzuki
>> > _______________________________________________
>> > webkit-dev mailing list
>> > webkit-dev at lists.webkit.org
>> > https://lists.webkit.org/mailman/listinfo/webkit-dev
>>
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