Nice! My actual goal is to get J talking to godot (game engine). As it
happens, rust and haskell are apparently two of the most-developed languages
for writing godot extensions, so if this fails I may try your haskell
bindings.
I got some rudimentary free pascal bindings working without much hassle
many years ago, so I think my problem really
is just not understanding the rust side, but I could have also
mis-translated something on the J end and just don't see it yet.
(as for the crash, that's pretty much what i get too.) I think the j.so or
j.dylib library needs to be in the
current directory at the moment, and you'd need to change line 13 to tell
it what the filename is.
The debugger tells me this, but I have no idea what I'm looking at here:
; id = {0xffffffff}, range = [0x00000001800fe110-0x00000001800fe260),
name="JDo"
; Source location: unknown
7FFCD598E110: 56 pushq %rsi
7FFCD598E111: 57 pushq %rdi
7FFCD598E112: 53 pushq %rbx
7FFCD598E113: 48 83 EC 40 subq $0x40, %rsp
7FFCD598E117: C5 F8 29 74 24 30 vmovaps %xmm6, 0x30(%rsp)
7FFCD598E11D: 48 8B 05 14 DC 3B 00 movq 0x3bdc14(%rip), %rax
7FFCD598E124: 48 31 E0 xorq %rsp, %rax
7FFCD598E127: 48 89 44 24 28 movq %rax, 0x28(%rsp)
7FFCD598E12C: 48 89 4C 24 20 movq %rcx, 0x20(%rsp)
7FFCD598E131: 8A 81 ED 01 00 00 movb 0x1ed(%rcx), %al
7FFCD598E137: 84 C0 testb %al, %al
7FFCD598E139: 0F 85 C6 00 00 00 jne 0x7ffcd598e205 ; <+245>
7FFCD598E13F: 80 B9 E0 52 00 00 02 cmpb $0x2, 0x52e0(%rcx)
I think maybe this is the start (??) of the code for JDo, so it might be
the parameter is an invalid pointer, but I don't know how to interpret this.
On Mon, Dec 6, 2021 at 8:47 PM Vanessa McHale <[email protected]> wrote:
> Hm, I’m not familiar with the dlopen crate, had you used it before? I
> can’t tell what’s going on under the hood!
>
> I was able to get FFI working by looking at
> https://github.com/jsoftware/stats_jserver4r/blob/4c94fc6df351fab34791aa9d78d158eaefd33b17/source/lib/j2r.c
> <
> https://github.com/jsoftware/stats_jserver4r/blob/4c94fc6df351fab34791aa9d78d158eaefd33b17/source/lib/j2r.c>
> and
> https://github.com/jsoftware/stats_jserver4r/blob/4c94fc6df351fab34791aa9d78d158eaefd33b17/source/lib/r2j.c
> <
> https://github.com/jsoftware/stats_jserver4r/blob/4c94fc6df351fab34791aa9d78d158eaefd33b17/source/lib/r2j.c
> >
>
> I got Haskell bindings: https://github.com/vmchale/j-hs <
> https://github.com/vmchale/j-hs> but BUT interestingly one test fails on
> older GHCs… can’t tell why and I never did get around to debugging it.
>
> BTW I get
>
> error: test failed, to rerun pass '--lib'
>
> Caused by:
> process didn't exit successfully:
> `/private/tmp/jlang-rs/target/debug/deps/jlang-1c90c81a3f6fae1c
> --nocapture` (signal: 11, SIGSEGV: invalid memory reference)
>
> on mac
>
> > On Dec 6, 2021, at 7:22 PM, bill lam <[email protected]> wrote:
> >
> > I don't know rust at all. What exactly do you expect and how it failed?
> >
> > On Tue, 7 Dec 2021 at 9:10 AM Michal Wallace <[email protected]>
> > wrote:
> >
> >> ... It was not a successfu attempt. :)
> >>
> >> https://github.com/tangentstorm/jlang-rs/blob/main/src/lib.rs
> >>
> >> The basic plumbing seems to work unless I actually call JDo() on line 75
> >> here.
> >> Any rust fans out there who might be able to help me figure this out?
> >>
> >> -Michal
> >> ----------------------------------------------------------------------
> >> For information about J forums see http://www.jsoftware.com/forums.htm
> >>
> > ----------------------------------------------------------------------
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>
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