hypermachines_sys/
lib.rs

1use byteorder::{ByteOrder, LittleEndian};
2use serde::de::DeserializeOwned;
3use serde::Serialize;
4use serde_cbor::{from_slice, to_vec};
5// use serde_json::{from_slice, to_vec};
6// use serde_json_wasm::{from_slice, to_vec};
7use std::alloc::{alloc, dealloc, Layout};
8use std::mem::size_of;
9use std::slice::{from_raw_parts, from_raw_parts_mut};
10
11// Exported Memory Management Functions
12
13extern "C" {
14  pub fn machine_hostcall(ptr: *mut u8, length: usize) -> *mut u8;
15  pub fn log_u32(i: u32);
16}
17
18pub fn malloc(size: usize) -> *mut u8 {
19  let layout = Layout::from_size_align(size, 2).unwrap();
20  unsafe { alloc(layout) }
21}
22
23pub fn free(ptr: *mut u8, size: usize) {
24  let layout = Layout::from_size_align(size as usize, 1).unwrap();
25  unsafe { dealloc(ptr, layout) }
26}
27
28// Helper Functions
29
30pub fn read_arguments(args_ptr: *mut u8, args_length: usize) -> Vec<u8> {
31  unsafe { from_raw_parts(args_ptr, args_length).to_vec() }
32}
33
34pub fn rpc_response<T: Serialize>(args: T) -> *mut u8 {
35  let bytes = to_vec(&args).unwrap();
36  let args_len = bytes.len();
37  let total_len = args_len + size_of::<u32>();
38  let result_ptr = malloc(total_len);
39  unsafe {
40    let slice = from_raw_parts_mut(result_ptr, total_len);
41    LittleEndian::write_u32(slice, args_len as u32);
42    slice[size_of::<u32>()..].copy_from_slice(&bytes);
43    result_ptr
44  }
45}
46
47pub fn host_request<T: Serialize, R: DeserializeOwned>(args: T) -> R {
48  let mut bytes = to_vec(&args).unwrap();
49  let args_len = bytes.len();
50  unsafe {
51    let ret_ptr = machine_hostcall(bytes.as_mut_ptr(), args_len);
52    let res_len = LittleEndian::read_u32(from_raw_parts(ret_ptr, size_of::<u32>())) as usize;
53    let slice = from_raw_parts(ret_ptr, res_len + size_of::<u32>());
54    let ret = from_slice(&slice[size_of::<u32>()..]).unwrap();
55    ret
56  }
57}
hypermachines_sys/lib.rs

hypermachines_sys/
lib.rs
