On Thu, 31 Dec 2020 at 09:00, Jakob Gruber <jgru...@chromium.org> wrote:
> Hi Ben, > > sorry for the late reply, I was (and still am) out of office. > > On Mon, Dec 7, 2020 at 3:24 PM Ben Hutchings <ben.hutchi...@essensium.com> > wrote: > [...] > Questions: >> >> 1. Is it expected that snapshots should generally work in >> cross-builds? >> >> Yes, with restrictions. For example, host- and target bitness must match, > both must be 32- or 64-bit. I haven't thought much about byte order in this > context, but it seems possible. Have you tried building the x86 mksnapshot > as big-endian? > I think my cross-builds were running mksnapshot with a big-endian target specified, but I would have to check that to be certain. But currently most object fields are copied directly to/from snapshots with no concern for byte order, so I don't think that had much effect. > Mksnapshot doesn't run any JS code and thus doesn't use the JS heap; all > it needs to do is create and serialize it properly. That seems like a good > first path to explore. > > There are some older, slightly related docs here: Windows > cross-compilation > <https://docs.google.com/document/d/1gUEKxe73GG7sXNmhdRwKfFFrt0LUBqkllP87wfF42M0/edit#>, > cross-compilation and mksnapshot > <https://docs.google.com/document/d/1A8p_OXE8fXE-IvL_qnpz7dYfs__VuUkVpivtLQFjY-Q/edit> > . > Thanks, this explains some things I was confused about. > >> 1. If they are expected to work, will it be acceptable to make a lot >> of changes to (de)serialisation to make them work with differing byte >> order? >> >> Yes, changes to support cross-byte-order builds would be acceptable in > general. I am hoping that their scope would remain small though. > [...] I'm afraid they're currently quite extensive, as I needed to extend object body descriptor classes to support iteration over all object fields (not just slots). Ben. -- -- v8-dev mailing list v8-dev@googlegroups.com 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 v8-dev+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/v8-dev/CAEwaF0WL3cxnd%3DX5Bj1%3DqhorvPEO%2Bn9rK9_x%2Bn%3D5UqTmw5T-Vg%40mail.gmail.com.
