Invoke other wasm function in native api: "Exception: invalid exec env"

[Jiax-cn]

I'm trying to invoke a wasm function (of another instance) in my native api, but failed with "Exception: invalid exec env". Is it impossible to achieve this without setting WAMR_DISABLE_HW_BOUND_CHECK? Any guidance would be appreciated.

[lum1n0us]

It's advisable not to use WAMR_DISABLE_HW_BOUND_CHECK to switch to software bounds checking unless the platform has poor support for signals and jmp.

For reference, please look at the examples in samples/basic or samples/spawn-thread, depending on your specific use case.

If that's acceptable, please share your embedded code for discussion.

[Jiax-cn]

Thanks for your response. Here is a simplified version of the code I’m working with:

hello.wasm

(import "my_module" "world" (func $world_func))
(func $_start 
  ;; printf("hello ")
  call $world_func
)

world.wasm

(func $_start 
  ;; printf("world!\n")
)

host_app

int main() {
    ...
    hello_module = wasm_runtime_load(hello_wasm ...);
    hello_module_inst = wasm_runtime_instantiate(hello_module, ...);
    hello_func = wasm_runtime_lookup_function(hello_module_inst, "_start");
    hello_exec_env = wasm_runtime_create_exec_env(hello_module_inst, ...);

    world_module = wasm_runtime_load(world_wasm ...);
    world_module_inst = wasm_runtime_instantiate(world_module, ...);
    world_func = wasm_runtime_lookup_function(world_module_inst, "_start");
    world_exec_env = wasm_runtime_create_exec_env(world_module_inst, ...);

    wasm_runtime_call_wasm(hello_exec_env, hello_func, ...);

    ...
}

native api wrapper

static void my_module_world_wrapper(...) {
    if (!wasm_runtime_call_wasm(world_exec_env, world_func, ...)) {
        // Exception: invalid exec env
        os_printf("%s\n", wasm_runtime_get_exception(world_module_inst));
    }
}

expected result:

hello world!

but result:

hello

#00: 0x0000 - _start

Exception: invalid exec env