Support creating multiple instances in a single native program

[calvin2021y]

Feature

It would be very helpful if wasm2native could support:

Creating multiple independent instances of the same compiled Wasm module.

Is the non-sandbox mode can support this?

Benefit

With multiple instance, we can run multi actor in single process with async support.

If non-sandbox with multiple instance is possible, the actor can be fast and easy to scale. At the same time, it can efficiently scan the disk cache without memory copying. or a no-copy network io mode by host function.

Implementation

for a start, the native API need change to something look like this:

int foo_native(w2n_exec_env_t exec_env , int a, int b)
{
    return a+b;
}

void foo2(w2n_exec_env_t exec_env, char * msg, uint8 * buffer, int buf_len)
{
    strncpy(buffer, msg, buf_len);
}