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use wasmer::*;
pub type Result<T, E = Box<dyn std::error::Error>> = std::result::Result<T, E>;
fn _ipcs_arg_count(ctx: &mut Ctx) -> u32 {
println!("_ipcs_arg_count");
let data = ctx.data.cast::<IoData>();
(unsafe { &*data }).args.len() as _
}
fn _ipcs_arg_len(ctx: &mut Ctx, idx: u32) -> u32 {
println!("_ipcs_arg_len: {}", idx);
let data = ctx.data.cast::<IoData>();
(unsafe { &*data }).args[idx as usize].len() as u32
}
fn _ipcs_arg_read(ctx: &mut Ctx, idx: u32, ptr: u32, offset: u32, len: u32) -> u32 {
println!("_ipcs_arg_read: {}, {}, {}, {}", idx, ptr, offset, len);
let data = ctx.data.cast::<IoData>();
let arg = (unsafe { &*data }).args[idx as usize];
let mem = ctx.memory(0);
let view = mem.view::<u8>();
let iter = arg[offset as usize..(offset + len) as usize]
.iter()
.zip(view[ptr as usize..(ptr + len) as usize].iter());
let mut count = 0;
for (src, dst) in iter {
dst.set(*src);
count += 1;
}
count
}
fn _ipcs_ret(ctx: &mut Ctx, ptr: u32, len: u32) {
let data = ctx.data.cast::<IoData>();
let mem = ctx.memory(0).view::<u8>();
for v in &mem[ptr as usize..(ptr + len) as usize] {
unsafe {
(&mut *data).ret.push(v.get());
}
}
}
struct IoData<'a> {
ret: Vec<u8>,
args: &'a [&'a [u8]],
}
pub fn exec(wasm: &[u8], args: &[&[u8]]) -> Result<Vec<u8>> {
let imports = imports! {
"_ipcs" => {
"_ipcs_arg_count" => func!(_ipcs_arg_count),
"_ipcs_arg_len" => func!(_ipcs_arg_len),
"_ipcs_arg_read" => func!(_ipcs_arg_read),
"_ipcs_ret" => func!(_ipcs_ret),
},
};
let mut instance = instantiate(wasm, &imports)?;
let mut io_data = IoData { ret: vec![], args };
instance.context_mut().data = &mut io_data as *mut _ as *mut _;
let entrypoint = format!("_ipcs_start");
let main = instance.dyn_func(&entrypoint)?;
assert_eq!(main.signature().params().len(), 0);
instance.call(&entrypoint, &[])?;
return Ok(io_data.ret);
}