On Tuesday, 23 June 2020 at 18:15:25 UTC, tirithen wrote:
Anyone that has something similar working with struct objects?
Passing anything besides int/double/bool between JS and wasm is
hard work.
Currently the ABI generated by LDC is so that arguments besides
int/double/bool (and array/delegates are special too) are passed
by pointer.
So if you want to call a wasm function that expects a struct, you
instead pass a pointer to wasm memory where you have encoded that
struct.
Similarly if you want to call a js function with rich objects you
have to do some handling on the JS side.
Return values other than int/double/bool from wasm functions are
special and it is expected that the function is called with a
pointer as first argument.
There are a few gotcha but this basically describes it.
In https://github.com/skoppe/spasm I am using this approach as
well. Except I don't actually move D struct to and from JS,
instead only references to JS objects, strings, delegates, unions
and arrays. Same principle applies though.
