TypeError: undefined is not an object when using FFI | Bun | Page 1

lone mango Sep 9, 2023, 8:51 PM

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theo ❯❯ bun src/example.ts
56 |       break;
57 |     }
58 |   }
59 |   return wrap.native = functionToCall, wrap.ptr = functionToCall.ptr, wrap;
60 |
61 | }, dlopen = function(path, options) {
                                           ^
TypeError: undefined is not an object
      at bun:ffi:61:40
      at /home/theo/dev/gurafikku/src/index.ts:5:26

import { dlopen, FFIType, ptr, suffix } from "bun:ffi";

const path = `libdawn.${suffix}`;

const { symbols: dawn } = dlopen(path, {
  wgpuCreateInstance: {
    args: [FFIType.pointer],
    returns: FFIType.pointer,
  },
  wgpuInstanceRelease: {
    args: [FFIType.pointer],
    returns: FFIType.void,
  },
});

The libdawn.so is in zig-out/lib and i tried using LD_LIBRARY_PATH=$PWD/zig-out/lib to point to it but that didnt help 🤔

lone mango Sep 10, 2023, 8:14 PM

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welp

vale notch Sep 10, 2023, 8:30 PM

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could you give build command for libdawn?

vale notch Sep 10, 2023, 9:46 PM

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figured it out

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looks like you are trying to import static library

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we should emit error instead of returning nothing

lone mango Sep 11, 2023, 1:11 AM

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It's a bit more than just building libdawn, I had to use the zig package manager to link it to a empty zig lib...
zig build -Dcpu=baseline -Doptimize=ReleaseFast is what i ran

const std = @import("std");
const mach_gpu_dawn = @import("mach_gpu_dawn");

pub fn build(b: *std.Build) !void {
    const target = b.standardTargetOptions(.{});
    const optimize = b.standardOptimizeOption(.{});

    const lib = b.addSharedLibrary(.{
        .name = "gurafikku",
        .root_source_file = .{ .path = "src/main.zig" },
        .target = target,
        .optimize = optimize,
    });
    try mach_gpu_dawn.link(b, lib, .{
        .install_libs = true,
        .from_source = true,
        .shared_libs = true,
    });
    b.installArtifact(lib);

    const main_tests = b.addTest(.{
        .root_source_file = .{ .path = "src/main.zig" },
        .target = target,
        .optimize = optimize,
    });

    const run_main_tests = b.addRunArtifact(main_tests);

    const test_step = b.step("test", "Run library tests");
    test_step.dependOn(&run_main_tests.step);
}

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but no im using a .so

lone mango Sep 11, 2023, 2:13 AM

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heo@gigatop ~/d/gurafikku (main)> file zig-out/lib/libdawn.so
zig-out/lib/libdawn.so: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, with debug_info, not stripped

🤔

vale notch Sep 11, 2023, 9:35 AM

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that still returns undefined?

vale notch Sep 11, 2023, 8:42 PM

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did some more testing and looks like there might be bigger issue at hand

lone mango Sep 11, 2023, 10:18 PM

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oh 👀

earnest crater Sep 11, 2023, 10:50 PM

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lone mango ``` theo ❯❯ bun src/example.ts 56 | break; 57 | } 58 | } 59 | retu...

do you need the returns: FFIType.void ?
i didn't use it in my own lib

mellow sky Sep 12, 2023, 7:15 AM

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I can +1 this doesn't work for me (MacOS) for zig, rust, or c, accross dylib or so files

vale notch Sep 12, 2023, 7:39 AM

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@strange vigil this does get called :)

strange vigil Sep 12, 2023, 10:50 AM

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oh weird

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where/how?

vale notch Sep 12, 2023, 10:55 AM

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dlopen()

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it's probably this commit https://github.com/oven-sh/bun/commit/943a6642243cbc8a180ab7108279dd7110ab1eaf#diff-244fe74efcec165c1e4be1ed7976800a09d97937bc6045f67a37f2d45be7e646

GitHub

Remove most C API usages, add debugger pretty printers for `Headers...

… URLSearchParams, FormData, Worker, EventTarget (#4187)

Add pretty printers for Headers, URLSearchParams, and FormData
[untested] Add way to code generate getInternalProperti...

mellow sky Sep 14, 2023, 1:13 AM

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@vale notch any ideas on how i could do a workaround? Building a web framework and want routing to be in a faster lang like zig

vale notch Sep 14, 2023, 6:21 AM

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either i or jarred will fix it

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until then you can use napi

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@maiden plinth remind 3h this

maiden plinthBOT Sep 14, 2023, 6:24 AM

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Alright @vale notch, in 3 hours: this

maiden plinthBOT Sep 14, 2023, 9:24 AM

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@vale notch, <t:1694672686:R>: this

mellow sky Sep 14, 2023, 10:53 AM

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thanks man, I appreciate it

vale notch Sep 14, 2023, 5:52 PM

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@lone mango @mellow sky so the issue is that you are looking for library in global instead of relative scope

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dlopen('file.so') and dlopen('./file.so')

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so either use absolute paths

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or dont forget ./

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the only bug here is that bun isn't throwing the error

vale notch Sep 14, 2023, 6:22 PM

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whole file is full of same bug lol

lone mango Sep 14, 2023, 6:38 PM

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oh lol

vale notch Sep 14, 2023, 6:38 PM

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two files now

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truly a bun moment

lone mango Sep 14, 2023, 6:40 PM

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Hmm. Is it relative to $PWD (./) or the ts file thats in ./src

vale notch Sep 14, 2023, 6:40 PM

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likely where you are running binary from

lone mango Sep 14, 2023, 6:40 PM

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const path = `../zig-out/lib/libdawn.${suffix}`;

const path = `./zig-out/lib/libdawn.${suffix}`;

both dont seem to work thonk

vale notch Sep 14, 2023, 6:41 PM

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full path?

lone mango Sep 14, 2023, 6:41 PM

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/home/theo/dev/gurafikku/packages/gurafikku/zig-out/lib/libdawn.so
56 |       break;
57 |     }
58 |   }
59 |   return wrap.native = functionToCall, wrap.ptr = functionToCall.ptr, wrap;
60 | 
61 | }, dlopen = function(path, options) {
                                           ^
TypeError: undefined is not an object

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/home/theo/dev/gurafikku/packages/gurafikku/zig-out/lib/libdawn.so: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, with debug_info, not stripped

vale notch Sep 14, 2023, 6:41 PM

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error

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sadly i am on arm linux so wont be able to give you my executable to see what is happening

lone mango Sep 14, 2023, 6:42 PM

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hm ok

vale notch Sep 14, 2023, 6:43 PM

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it keeps going 🙂

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even outside ffi

lone mango Sep 14, 2023, 6:43 PM

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oof

vale notch Sep 14, 2023, 6:45 PM

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not gonna fix it outside ffi for now

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clearly a bigger problem

vale notch Sep 14, 2023, 7:33 PM

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ok now i am lost

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it only affects one single function

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okay i think i figured it out

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even more deep

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yeah

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@strange vigil errors thrown inside bun/js/*.ts are silenced and execution resumes

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but only from native function calls

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import { CString } from 'bun:ffi';

const err = new CString({});
console.log('still alive', err);```

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add BunCString to exports and it will behave correctly in user code

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import { BunCString } from 'bun:ffi';

const err = new BunCString({}); // throws here
console.log('still alive', err);```

strange vigil Sep 14, 2023, 9:17 PM

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oh no

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i wonder if we are using

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a catch scope

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when initializing them

lone mango Sep 21, 2023, 11:54 PM

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😭

Now I'm getting a better error message but it still doesnt work with an absolute path

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/home/theo/dev/gurafikku/packages/gurafikku/zig-out/lib/libdawn.so

ERR_DLOPEN_FAILED: Failed to open library. This is usually caused by a missing library or an invalid library path.
 syscall: "dlopen"

lone mango Sep 22, 2023, 12:25 AM

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Rebuilt with zig build -Dcpu=baseline -Dtarget=x86_64-linux-gnu, same issue

#TypeError: undefined is not an object when using FFI