Pass 2 array parameters into wasm

Question

I have a c++ function that accepts 2 arrays and multiplies them together.

void multData(unsigned char *arr1, unsigned char *arr2) {
   for(i=0;i<10;i++){
    arr1[i] = arr1[i] * arr2[i];
   }
}

When I compile it I allocate space for both arrays in the heap using malloc.

var mallocBuff = Module._malloc(arr1.length); 
var mallocBuff2 = Module._malloc(arr2.length);

Then after filling the newly malloced data with values I'll call it like this:

Module.ccall('multData', null, ['number'], [mallocBuff], [mallocBuff2]);

However after some testing I realize that only the first array is receiving the malloc pointer. The second array is just a bunch of 0's.

Is there anyway to pass 2 arrays into a wasm compiled function?

zakki · Accepted Answer · 2018-07-24 05:15:09Z

1

The ccall signature is ccall(ident, returnType, argTypes, args, opts). API Reference

Module.ccall('multData', null, ['number', 'number'], [mallocBuff, mallocBuff2]);

answered Jul 24, 2018 at 5:15

zakki

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