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Calling freeBuffer correctly to avoid Memory Out of Bounds
Ref: https://github.com/hellwolf/haskell-examples/blob/master/2023-02-24-wasm-comm/client.js
@hellwolf This example has some really useful utilities for working with strings in Haskell WASM reactors. Thank you for publishing it!
I was wondering about these two functions:
function withCStrings(strs, op) {
const cstrs = strs.map(str => {
const s = new TextEncoder().encode(str);
const l = s.length + 1;
const p = inst.exports.callocBuffer(l);
const b = new bufferAt(p, l);
b.set(s);
return p;
});
const r = op(cstrs);
strs.forEach(inst.exports.freeBuffer);
return r;
}
function fromCString(cstr) {
const s = new TextDecoder("utf8").decode(cstringBufferAt(cstr));
inst.exports.freeBuffer(cstr);
return s;
}
In the first function freeBuffer
is called on strs
which is presumed to be an array of utf-8
encoded strings.
In the second function freeBuffer
is called on cstr
, the CString representation of a string.
Is there a reason for the inconsistency? I would expect that freeBuffer
use is correct in fromCString
but this actually causes intermittent Memory Out of Bounds errors for me. Changing it to inst.exports.freeBuffer(s);
so that it's operating on the utf-8
encoded string solves these but I have no idea why.
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