CODEWITHSUNDEEP
javascriptcwebassembly
Andrei CACIO
Andrei CACIO

Reputation: 2119

Wasm compilation exceeds internal limits in this context for the provided arguments

So I am trying to create a WebAssembly Module from an ArrayBuffer.

C code:

#include <stdio.h>

int main() {
      printf("hello, world!\n");
        return 0;
}

I compile it like so: 

$ emcc -O2 hello.c -s WASM=1 -o hello.html

I start a local http server. And I try to load it in my browser like so:

fetch('hello.wasm')
.then(res => res.arrayBuffer())
.then(buff => WebAssembly.Module(buff));

And I get the following error:

Uncaught (in promise) RangeError: WebAssembly.Module(): Wasm compilation exceeds internal limits in this context for the provided arguments at fetch.then.then.buff (:1:77) at

I don't what to make of this error and I can't find anything via web searches.

Any help is kindly appreciated

Thanks!

Upvotes: 4

Views: 602

Answers (1)

JF Bastien
JF Bastien

Reputation: 6853

WebAssembly.Module is synchronous and some browsers don't allow large modules on the main thread to avoid having compilation block the main thread.

Try this instead:

fetch('hello.wasm').then(response =>
    response.arrayBuffer()
).then(buffer =>
    WebAssembly.instantiate(buffer, importObj)
).then(({module, instance}) =>
    instance.exports.f()
);

It's better to use WebAssembly.instantiate because it does compilation and instantiation together and allows the engine to keep at the importObject to make sure things look OK (especially, the WebAssembly.Memory).

Here I assume you want more than main, and instead want to invoke your module's exported function f.

Upvotes: 2

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