Stream: git-wasmtime

Topic: wasmtime / issue #1940 wasm2obj: exported function names

Wasmtime GitHub notifications bot (Sep 11 2021 at 19:18):

bjorn3 commented on issue #1940:

Wasm2obj has been deleted in favor of wasmtime compile, so this can be closed I think.

Wasmtime GitHub notifications bot (Sep 13 2021 at 12:21):

akirilov-arm commented on issue #1940:

Yes, but wasmtime compile could be similarly affected - @alexcrichton, any opinion?

Wasmtime GitHub notifications bot (Sep 13 2021 at 14:09):

alexcrichton commented on issue #1940:

The format of the ELF with wasmtime compile isn't a public implementation detail so it's not intended to be consumed elsewhere, so because it's purely an implementation detail I'm gonna close this. Eventually we'll want a public-facing object-file format, but this will almost surely be addressed in such an implementation.

Wasmtime GitHub notifications bot (Sep 13 2021 at 14:09):

alexcrichton closed issue #1940:

Not sure if this is a bug, my own user error, or just a not-implemented-yet.

I have the following minimal Wasm example (hello.wat):

(module
  (func (export "helloFunc") (result i32) (i32.const 42))
)

wasm2obj seems to not respect the declared export function name:

(Linux)
> wasmtime wasm2obj hello.wat hello.o
> nm hello.o
0000000000000000 D _vmcontext_init
0000000000000000 T _wasm_function_0

(macOS)
> wasmtime wasm2obj hello.wat hello.o
> nm hello.o
000000000000000e D __vmcontext_init
0000000000000000 T __wasm_function_0

Instead of _wasm_function_0, I was expecting helloFunc.

This behavior is still the same with the following hello.wat declaring the export a different way:

(module
  (func (result i32) (i32.const 42))
  (export "helloFunc" (func 0))
)

I've tested this on Wasmtime master as of this writing, which is commit c91a9313b. As shown above, I observed this behavior on both Linux and macOS.

Last updated: Dec 06 2025 at 06:05 UTC