//! System bindings for the risc0 zkvm platform
//!
//! This module contains the facade (aka platform-specific) implementations of
//! OS level functionality for zkvm.
//!
//! This is all super highly experimental and not actually intended for
//! wide/production use yet, it's still all in the experimental category. This
//! will likely change over time.
#![forbid(unsafe_op_in_unsafe_fn)]

pub const WORD_SIZE: usize = size_of::<u32>();

pub mod abi;
pub mod os;

use crate::io as std_io;

// SAFETY: must be called only once during runtime initialization.
// NOTE: this is not guaranteed to run, for example when Rust code is called externally.
pub unsafe fn init(_argc: isize, _argv: *const *const u8, _sigpipe: u8) {}

// SAFETY: must be called only once during runtime cleanup.
// NOTE: this is not guaranteed to run, for example when the program aborts.
pub unsafe fn cleanup() {}

pub fn unsupported<T>() -> std_io::Result<T> {
    Err(unsupported_err())
}

pub fn unsupported_err() -> std_io::Error {
    std_io::Error::UNSUPPORTED_PLATFORM
}

pub fn abort_internal() -> ! {
    core::intrinsics::abort();
}
