Hello,
When building vim.js (http://coolwanglu.github.io/vim.js/web/vim.html), I
tried to analyze the output of emscripten, and do some dirty work for async
functions.
The dirty work is quite simple, just to insert a new arg in the beginning
of the function argument list and call it, In C the function pointer is
forced casted into a pointer to a function with the same number of (void*)
parameters.
For example:
// in C
int (*fp) (int a, int b);
async_call(*fp, 1, 2);
// in JS
function _async_call (func) {
var new_args = argument.slice(0);
new_args[0] = FAKE_ARG
FUNCTION_TABLE[func].apply(null, new_args);
}
Right now I'm thinking about enable ASM_JS to improve the performance,
As stated in the wiki, when ASM_JS is enabled, functions are stored into
different tables for optimizations, so given only a fuction pointer (sent
from C), JS code can no longer find the correct function since it does not
know the type of the function.
Is there an easy way to achieve this without defining functions for each
type of function? Hopefully some information can be passed into js,
something like this:
// in C
async_call(EM_GET_FUNC_TABLE(fp), fp, 1,2)
// in JS
function _async_call(tbl, func) {
tbl[func].apply ...
}
Maybe a more `natural` way is to deref it in C, such that js would get
the raw function, but it might not make as much as sense as I had thought
of:
// in C
async_call(*fp, 1, 2);
// in JS
_async_call(func) {
func.apply... // no deref
}
Could any one please advise?
Thanks!
regards,
- Lu
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