import wasm

fn main() {
    mut m := wasm.Module{}
    m.enable_debug('vlang')
    m.new_function_import('wasi_unstable', 'proc_exit', [.i32_t], [])
    m.new_function_import('wasi_unstable', 'fd_write', [.i32_t, .i32_t, .i32_t, .i32_t], [
        .i32_t,
    ])
    m.assign_memory('memory', true, 1, none)

    m.new_data_segment('CIOVec.str', 0, [u8(8), 0, 0, 0]) // pointer to string
    m.new_data_segment('CIOVec.len', 4, [u8(13), 0, 0, 0]) // length of string
    m.new_data_segment(none, 8, 'Hello, WASI!\n'.bytes())

    mut func := m.new_function('_start', [], [])
    {
        func.i32_const(1) // stdout
        func.i32_const(0) // *iovs
        func.i32_const(1) // 1 iov
        func.i32_const(-1) // *retptrs
        func.call_import('wasi_unstable', 'fd_write')
        func.drop()
        func.i32_const(0)
        func.call_import('wasi_unstable', 'proc_exit')
    }
    m.commit(func, true)

    print(m.compile().bytestr())
}