Can't run simple cpp file

[geloizi]

A simple cpp program:

#include <iostream>
int main() {
    std::cout << "hello world\n";
}

Compiled with emscripten:

em++ -o cpp.js cpptest.cpp

Execution fails:

wasmer run cpp.wasm                                                                            
"Can\'t instantiate module: LinkError([ImportNotFound { namespace: \"env\", name: \"abortOnCannotGrowMemory\" }, ImportNotFound { namespace: \"env\", name: \"abortStackOverflow\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_ii\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_iii\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_iiii\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_iiiii\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_iiiiid\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_iiiiii\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_iiiiiid\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_iiiiiii\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_iiiiiiii\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_iiiiiiiii\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_iiiiij\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_v\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_vi\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_vii\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_viii\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_viiii\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_viiiii\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_viiiiii\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_viijii\" }, ImportNotFound { namespace: \"env\", name: \"___cxa_uncaught_exception\" }, ImportNotFound { namespace: \"env\", name: \"___lock\" }, ImportNotFound { namespace: \"env\", name: \"___map_file\" }, ImportNotFound { namespace: \"env\", name: \"___setErrNo\" }, ImportNotFound { namespace: \"env\", name: \"___syscall140\" }, ImportNotFound { namespace: \"env\", name: \"___syscall145\" }, ImportNotFound { namespace: \"env\", name: \"___syscall146\" }, ImportNotFound { namespace: \"env\", name: \"___syscall54\" }, ImportNotFound { namespace: \"env\", name: \"___syscall6\" }, ImportNotFound { namespace: \"env\", name: \"___syscall91\" }, ImportNotFound { namespace: \"env\", name: \"___unlock\" }, ImportNotFound { namespace: \"env\", name: \"_abort\" }, ImportNotFound { namespace: \"env\", name: \"_emscripten_get_heap_size\" }, ImportNotFound { namespace: \"env\", name: \"_emscripten_memcpy_big\" }, ImportNotFound { namespace: \"env\", name: \"_emscripten_resize_heap\" }, ImportNotFound { namespace: \"env\", name: \"_getenv\" }, ImportNotFound { namespace: \"env\", name: \"_llvm_stackrestore\" }, ImportNotFound { namespace: \"env\", name: \"_llvm_stacksave\" }, ImportNotFound { namespace: \"env\", name: \"_pthread_cond_wait\" }, ImportNotFound { namespace: \"env\", name: \"_strftime_l\" }, ImportNotFound { namespace: \"env\", name: \"memory\" }, ImportNotFound { namespace: \"env\", name: \"table\" }, ImportNotFound { namespace: \"env\", name: \"__memory_base\" }, ImportNotFound { namespace: \"env\", name: \"__table_base\" }, ImportNotFound { namespace: \"env\", name: \"DYNAMICTOP_PTR\" }, ImportNotFound { namespace: \"env\", name: \"tempDoublePtr\" }, ImportNotFound { namespace: \"global\", name: \"NaN\" }, ImportNotFound { namespace: \"global\", name: \"Infinity\" }])"

[MarkMcCaskey]

Thanks for reporting this! So there are two reasons this could have happened:

• Master was broken for the past 11 hours and it was attempting to run Emscripten WASM files as WASI WASM files
• If you're using a released version of Wasmer, then because we haven't released in a bit, it's missing a lot more emscripten syscalls. Once I fixed master, I noticed that it was still missing two which I implemented.

After those were fixed, I'm still having an issue running this program; I'm getting a "RuntimeError: WebAssembly trap occured during runtime: memory out-of-bounds access" -- which I'll start investigating now

[syrusakbary]

Yes, to add on top of what @MarkMcCaskey commented.

When running with released version 0.2.1 this is the output:

➜  wasmer run cpp.wasm
"Can\'t instantiate module: LinkError([ImportNotFound { namespace: \"env\", name: \"nullFunc_iiiiid\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_iiiiiid\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_iiiiiii\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_iiiiiiii\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_iiiiiiiii\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_iiiiij\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_viijii\" }, ImportNotFound { namespace: \"env\", name: \"___cxa_uncaught_exception\" }, ImportNotFound { namespace: \"env\", name: \"_strftime_l\" }])"

And when run with current master (your error):

➜  wasmer run cpp.wasm
"Can\'t instantiate module: LinkError([ImportNotFound { namespace: \"env\", name: \"abortStackOverflow\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_ii\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_iii\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_iiii\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_iiiii\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_iiiiid\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_iiiiii\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_iiiiiid\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_iiiiiii\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_iiiiiiii\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_iiiiiiiii\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_iiiiij\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_v\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_vi\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_vii\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_viii\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_viiii\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_viiiii\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_viiiiii\" }, ImportNotFound { namespace: \"env\", name: \"nullFunc_viijii\" }, ImportNotFound { namespace: \"env\", name: \"___cxa_uncaught_exception\" }, ImportNotFound { namespace: \"env\", name: \"___lock\" }, ImportNotFound { namespace: \"env\", name: \"___map_file\" }, ImportNotFound { namespace: \"env\", name: \"___setErrNo\" }, ImportNotFound { namespace: \"env\", name: \"___syscall140\" }, ImportNotFound { namespace: \"env\", name: \"___syscall145\" }, ImportNotFound { namespace: \"env\", name: \"___syscall146\" }, ImportNotFound { namespace: \"env\", name: \"___syscall54\" }, ImportNotFound { namespace: \"env\", name: \"___syscall6\" }, ImportNotFound { namespace: \"env\", name: \"___syscall91\" }, ImportNotFound { namespace: \"env\", name: \"___unlock\" }, ImportNotFound { namespace: \"env\", name: \"_abort\" }, ImportNotFound { namespace: \"env\", name: \"_emscripten_get_heap_size\" }, ImportNotFound { namespace: \"env\", name: \"_emscripten_memcpy_big\" }, ImportNotFound { namespace: \"env\", name: \"_emscripten_resize_heap\" }, ImportNotFound { namespace: \"env\", name: \"_getenv\" }, ImportNotFound { namespace: \"env\", name: \"_llvm_stackrestore\" }, ImportNotFound { namespace: \"env\", name: \"_llvm_stacksave\" }, ImportNotFound { namespace: \"env\", name: \"_pthread_cond_wait\" }, ImportNotFound { namespace: \"env\", name: \"_strftime_l\" }, ImportNotFound { namespace: \"env\", name: \"abortOnCannotGrowMemory\" }, ImportNotFound { namespace: \"env\", name: \"memory\" }, ImportNotFound { namespace: \"env\", name: \"table\" }, ImportNotFound { namespace: \"env\", name: \"__memory_base\" }, ImportNotFound { namespace: \"env\", name: \"__table_base\" }, ImportNotFound { namespace: \"env\", name: \"tempDoublePtr\" }, ImportNotFound { namespace: \"env\", name: \"DYNAMICTOP_PTR\" }, ImportNotFound { namespace: \"global\", name: \"NaN\" }, ImportNotFound { namespace: \"global\", name: \"Infinity\" }])"

We are working on investigating the issue and fixing it asap.

[MarkMcCaskey]

We just found and are pushing a fix for C++! We're going to wrap it up with the other fixes and add it as a test.

It should be merged on to master soon!

[syrusakbary]

It seemed we were missing calling globalCtors (required for cpp files).
https://github.com/wasmerio/wasmer/pull/328/files#diff-6c1320db2af15a1d4083a7c5fab79cffR252
We just solved the issue on master with #328.

Here's the test file: https://github.com/wasmerio/wasmer/pull/328/files#diff-cbdacb4dc71f3c9fa01eb318ad62dda2R1
And the output that it should generate when running it with wasmer: https://github.com/wasmerio/wasmer/pull/328/files#diff-a302d4bac00cf38a4eccd6a4a85dccdfR1

We will make a wasmer release soon.

[geloizi]

It still fails with

"RuntimeError: WebAssembly trap occured during runtime: memory out-of-bounds access"

BTW, there is a typo in error message. It should be " occurred".

[syrusakbary]

Can you try with wasmer run cpp.wasm --disable-cache?
Also, if you can upload your wasm file here it would be awesome, and it would help us debug further.

This is the file we have been able to run successfully, in case you want to try locally: https://github.com/wasmerio/wasmer/blob/master/lib/emscripten/emtests/hello.wasm

(compiled from here)

[geloizi]

Confirmed. The issue has been fixed.

BTW, I've tried to build with latest-upstream version of emscripten (it's based on llbvm8), wasmer doesn't support it.

"Hello world" compiled with latest-upstream.
cpp.zip

[MarkMcCaskey]

Thanks for following up @geloizi ; so I just ran the included hello.wasm in your zip file and it seems to be working on master for me. I'll look in to reproducing this and get back to you today

[MarkMcCaskey]

@geloizi What OS are you running this on or if you could include the error output, that'd be very helpful!

[geloizi]

What OS are you running this on

mac

[MarkMcCaskey]

What OS are you running this on

mac

Hmm, I'm also running on a mac and am unable to reproduce with master and the cpp.wasm you posted.

[geloizi]

never-mind. Emscripten latest-upstream isn't a stable release anyway.

[MarkMcCaskey]

Okay! Well please let me know if you have any other issues or ideas for Wasmer and I'll look in to them! I'm going to close this issue for now