Exception: failed to call unlinked import function (env, abort)

[victortanjh]

When I calling a wasm function(AssemblyScript) by wasm_runtime_call_wasm(exec_env, func, 2, argvIn), I got a error. I catch the exception by wasm_runtime_get_exception(module_inst), and the exception info is "Exception: failed to call unlinked import function (env, abort)".

My question is : can I get the call stack in AssemblyScript? And what's the meaning of "Exception: failed to call unlinked import function (env, abort)"?

Thank you very much!

[wustwn]

@victortanjh please ref to #510 , you should implement your abort wrapper native API and register it to runtime.

Could you please have a try? Thanks.

[victortanjh]

Thank you! I followed the #510 . This is my abort wrapper function: void AbortWrapper(wasm_exec_env_t exec_env, char *msg, char *fileName, uint32_t lineNumber, uint32_t columnNumber) { LogInfof("enter AbortWrapper"); wasm_module_inst_t module_inst = get_module_inst(exec_env); char buf[2048]; snprintf(buf, sizeof(buf), "env.abort(msg:%s, file:%s, lineNumber:%i, columnNumber:%i)",msg, fileName, lineNumber, columnNumber); wasm_runtime_set_exception(module_inst, buf); }

this is the native_sysbols register info: {"abort", AbortWrapper, "($$ii)", NULL},

and the catched exception is : Exception: env.abort(msg:, file:~, lineNumber:268, columnNumber:14) but, the msg and file info is empty, do you known why?

@wustwn

[wustwn]

@victortanjh It seems that the msg here is probably a struct rather than a string, so maybe you should check the details of it. If the msg is a struct, you should use * to replace the $ when registering API to runtime.

Can you have a try? Thanks.

[victortanjh]

Thank you!

the definition of abort in AssemblyScript is: // @ts-ignore: decorator @external("env", "abort") declare function abort( message?: string | null, fileName?: string | null, lineNumber?: u32, columnNumber?: u32 ): void;

So, maybe this is a bug for AssemblyScript.

[xujuntwt95329]

Hi @victortanjh

This may not be a bug, I've checked the document from AssemblyScript, the String in AS is encoded as UTF-16, which is not compatible with C string. You may need to decode it into ASCII in the wrapper, or you can override the default abort function provided by AS and pass a UTF-8 encoded string to your wrapper function, please refer to override abort

Note: you can convert AS string to UTF-8 encoded one by this encoding API:

function String.UTF8.encode(str: string, nullTerminated?: bool): ArrayBuffer