FFI

sleep = extern sleep(seconds=N)
sleep(1)

load 'm' # load a shared library
sin = extern sin(num=d) -> d
sin(2.0)

crypto = class() {
  load "ffi"
  extern (link "-lcrypto") {
    SHA1 = (src=*u8, sz=c_uint, out=*u8) -> *u8
    MD5 = (src=*u8, sz=c_uint, out=*u8) -> *u8
    SHA224 = (src=*u8, sz=c_uint, out=*u8) -> *u8
    SHA256 = (src=*u8, sz=c_uint, out=*u8) -> *u8
    SHA384 = (src=*u8, sz=c_uint, out=*u8) -> *u8
    SHA512 = (src=*u8, sz=c_uint, out=*u8) -> *u8
  }
}

Signature types

See internal.c:potion_type_char

STATUS 50%

Implemented

• calling convention within same ABI
• extern proto declaration in branch extern

TODO

• calling convention with different ABI (syntax and code, no win64, no stdcall yet)
• either precompile each ffi proto to a signature translation wrapper, or translate the sigs at the call ext part in the vm, similar to filling in defaults.
• return type declaration syntax. like an optional extern int sleep(sec=N). or extern sleep(sec=N) => N
• call it (vm and jit)
• move some of compile-time parts to the VM (OP_EXTERN dlsym). currently we can only call into already loaded libs, or load a lib at compile-time (as in p2 BEGIN{})
• non-core convenience ffi library for handling aggregate structs, ptrs, typical types.
• implement syntax C blocks to parse headers natively.