On Fri, Sep 30, 2022 at 7:36 AM Aapo Alasuutari <[email protected]> wrote:
> Still hoping to get some guidance with this. > > I'm also interested in support, even if limited, for string value > parameters (or even return values) and returning of TypedArray buffers. > Though, I expect those to be much harder to implement than returning > External objects for void pointers. I guess a somewhat related option is to > return external pointers as zero-sized TypedArrays / ArrayBuffers, but that > sounds quite wrong compared to External objects. > > On Friday, 23 September 2022 at 15:15:10 UTC+3 Aapo Alasuutari wrote: > >> I presume Maya might now be back be at the office? >> >> Would it be possible to get some guidance regarding implementing void >> pointer support, either here on Groups or possibly by organizing an online >> meeting of some sort? >> >> -Aapo >> >> On Tuesday, 23 August 2022 at 11:32:30 UTC+3 [email protected] wrote: >> >>> Hi, yes, Maya is out until mid-september. >>> Cheers, Camillo >>> >>> On Tue, 23 Aug 2022 at 07:07, Aapo Alasuutari <[email protected]> >>> wrote: >>> >>>> Has Maya possibly returned from vacation? Or is their leave still >>>> continuing? >>>> >>>> On Friday, 29 July 2022 at 12:08:53 UTC+3 [email protected] wrote: >>>> >>>>> Maya is on leave over the summer, unfortunately. >>>>> >>>>> On Fri, Jul 29, 2022 at 11:02 AM Leszek Swirski <[email protected]> >>>>> wrote: >>>>> >>>>>> +Maya, you're probably the best person to answer this. >>>>>> >>>>>> On Tue, Jul 26, 2022 at 9:05 PM Aapo Alasuutari <[email protected]> >>>>>> wrote: >>>>>> >>>>>>> Hello, >>>>>>> >>>>>>> I'm interested in implementing `void*` pointer support for Fast API >>>>>>> calls. My thinking was that V8's `External` objects are appropriate to >>>>>>> stand in for external `void*` pointers coming in from external code and >>>>>>> going back out, since that's what they're (presumably) meant for. >>>>>>> >>>>>>> Unfortunately this seems to be a complex endeavour, a bit more than >>>>>>> I can start hacking together directly. I'm also not sure if the >>>>>>> `Sandboxify >>>>>>> JSExternalObject external pointer` PR will complicate this plan of mine. >>>>>>> >>>>>>> The origin of my interest is Deno FFI support, that is calling >>>>>>> native libraries from Deno JS runtime that uses the V8 engine. Recent >>>>>>> changes to the FFI have added V8 Fast API support and made the FFI a lot >>>>>>> faster, but unfortunately we're bound to using plain numbers as >>>>>>> pointers, >>>>>>> meaning both that creating pointers is as easy as just writing a number >>>>>>> and >>>>>>> that (Fast API compatible) pointers are limited to 53 bit numbers which >>>>>>> will not be enough for eg. pointer cryptography on ARM v8.3. >>>>>>> >>>>>>> It believe it would be preferable if Deno could use `External` >>>>>>> objects to stand for pointers but this would negate the current Fast API >>>>>>> performance benefits. Thus, `void*` pointer support for fast calls. >>>>>>> >>>>>>> >>>>>>> Any comments? Suggestions on how I might best proceed with this to >>>>>>> implement it? Or is this perhaps not a reasonable idea? >>>>>>> >>>>>>> Side note: I was sad to find that getting the pointer value out of >>>>>>> an `Local<External>` is measurably slower than getting the pointer >>>>>>> number >>>>>>> value out of a `Local<Number>`. This is presumably due to the `External` >>>>>>> internally saving the pointer in the `ExternalMap`. The slower >>>>>>> performance >>>>>>> is still a bit sad, from having expected `External` to be the main >>>>>>> public >>>>>>> API meant to handle external pointers. >>>>>>> >>>>>>> -- >>>>>>> -- >>>>>>> v8-dev mailing list >>>>>>> [email protected] >>>>>>> http://groups.google.com/group/v8-dev >>>>>>> --- >>>>>>> You received this message because you are subscribed to the Google >>>>>>> Groups "v8-dev" group. >>>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>>> send an email to [email protected]. >>>>>>> To view this discussion on the web visit >>>>>>> https://groups.google.com/d/msgid/v8-dev/a4914444-88bf-4238-828c-9ec3f2e09878n%40googlegroups.com >>>>>>> <https://groups.google.com/d/msgid/v8-dev/a4914444-88bf-4238-828c-9ec3f2e09878n%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>>>> . >>>>>>> >>>>>> -- >>>>>> -- >>>>>> v8-dev mailing list >>>>>> [email protected] >>>>>> http://groups.google.com/group/v8-dev >>>>>> --- >>>>>> You received this message because you are subscribed to the Google >>>>>> Groups "v8-dev" group. >>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>> send an email to [email protected]. >>>>>> >>>>> To view this discussion on the web visit >>>>>> https://groups.google.com/d/msgid/v8-dev/CAGRskv_o%3DdZTXdYAceSM%2BdaabpJKFYZwEFMjvzS3_8jy3e0TuQ%40mail.gmail.com >>>>>> <https://groups.google.com/d/msgid/v8-dev/CAGRskv_o%3DdZTXdYAceSM%2BdaabpJKFYZwEFMjvzS3_8jy3e0TuQ%40mail.gmail.com?utm_medium=email&utm_source=footer> >>>>>> . >>>>>> >>>>> -- >>>> -- >>>> v8-dev mailing list >>>> [email protected] >>>> http://groups.google.com/group/v8-dev >>>> --- >>>> You received this message because you are subscribed to the Google >>>> Groups "v8-dev" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> >>> To view this discussion on the web visit >>>> https://groups.google.com/d/msgid/v8-dev/17c3b560-e88d-41a7-b64d-d792b4021613n%40googlegroups.com >>>> <https://groups.google.com/d/msgid/v8-dev/17c3b560-e88d-41a7-b64d-d792b4021613n%40googlegroups.com?utm_medium=email&utm_source=footer> >>>> . >>>> >>> Camillo Bruni | Software Engineer, V8 | Google Germany GmbH | Erika-Mann >>> Str. 33, 80636 München >>> >>> Registergericht und -nummer: Hamburg, HRB 86891 | Sitz der >>> Gesellschaft: Hamburg | Geschäftsführer: Paul Manicle, Halimah DeLaine >>> Prado >>> >>> Diese E-Mail ist vertraulich. Falls Ssie diese fälschlicherweise >>> erhalten haben sollten, leiten Sie diese bitte nicht an jemand anderes >>> weiter, löschen Sie alle Kopien und Anhänge davon und lassen Sie mich bitte >>> wissen, dass die E-Mail an die falsche Person gesendet wurde. This >>> e-mail is confidential. If you received this communication by mistake, >>> please don't forward it to anyone else, please erase all copies and >>> attachments, and please let me know that it has gone to the wrong person. >>> >> -- > -- > v8-dev mailing list > [email protected] > http://groups.google.com/group/v8-dev > --- > You received this message because you are subscribed to the Google Groups > "v8-dev" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/v8-dev/1111ab24-1132-4752-ba60-130d658a2892n%40googlegroups.com > <https://groups.google.com/d/msgid/v8-dev/1111ab24-1132-4752-ba60-130d658a2892n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- Google Germany GmbH Erika-Mann-Straße 33 80636 München Geschäftsführer: Paul Manicle, Liana Sebastian. Registergericht und -nummer: Hamburg, HRB 86891 Sitz der Gesellschaft: Hamburg Diese E-Mail ist vertraulich. Falls sie diese fälschlicherweise erhalten haben sollten, leiten Sie diese bitte nicht an jemand anderes weiter, löschen Sie alle Kopien und Anhänge davon und lassen Sie mich bitte wissen, dass die E-Mail an die falsche Person gesendet wurde. This e-mail is confidential. If you received this communication by mistake, please don't forward it to anyone else, please erase all copies and attachments, and please let me know that it has gone to the wrong person. -- -- v8-dev mailing list [email protected] http://groups.google.com/group/v8-dev --- You received this message because you are subscribed to the Google Groups "v8-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. 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