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use super::env::get_emscripten_data;
use super::process::abort_with_message;
use libc::c_int;
// use std::cell::UnsafeCell;
use crate::EmEnv;
use std::error::Error;
use std::fmt;
use wasmer::RuntimeError;
/// setjmp
pub fn __setjmp(ctx: &EmEnv, _env_addr: u32) -> c_int {
debug!("emscripten::__setjmp (setjmp)");
abort_with_message(ctx, "missing function: _setjmp");
unreachable!()
// unsafe {
// // Rather than using the env as the holder of the jump buffer pointer,
// // we use the environment address to store the index relative to jumps
// // so the address of the jump it's outside the wasm memory itself.
// let jump_index = emscripten_memory_pointer!(ctx.memory(0), env_addr) as *mut i8;
// // We create the jump buffer outside of the wasm memory
// let jump_buf: UnsafeCell<[u32; 27]> = UnsafeCell::new([0; 27]);
// let jumps = &mut get_emscripten_data(ctx).jumps;
// let result = setjmp(jump_buf.get() as _);
// // We set the jump index to be the last 3value of jumps
// *jump_index = jumps.len() as _;
// // We hold the reference of the jump buffer
// jumps.push(jump_buf);
// result
// }
}
/// longjmp
#[allow(unreachable_code)]
pub fn __longjmp(ctx: &EmEnv, _env_addr: u32, _val: c_int) {
debug!("emscripten::__longjmp (longmp)");
abort_with_message(ctx, "missing function: _longjmp");
// unsafe {
// // We retrieve the jump index from the env address
// let jump_index = emscripten_memory_pointer!(ctx.memory(0), env_addr) as *mut i8;
// let jumps = &mut get_emscripten_data(ctx).jumps;
// // We get the real jump buffer from the jumps vector, using the retrieved index
// let jump_buf = &jumps[*jump_index as usize];
// longjmp(jump_buf.get() as _, val)
// };
}
#[derive(Copy, Clone, Debug)]
pub struct LongJumpRet;
impl fmt::Display for LongJumpRet {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "LongJumpRet")
}
}
impl Error for LongJumpRet {}
/// _longjmp
// This function differs from the js implementation, it should return Result<(), &'static str>
#[allow(unreachable_code)]
pub fn _longjmp(ctx: &EmEnv, env_addr: i32, val: c_int) {
let val = if val == 0 { 1 } else { val };
get_emscripten_data(ctx)
.set_threw_ref()
.expect("set_threw is None")
.call(env_addr, val)
.expect("set_threw failed to call");
// TODO: return Err("longjmp")
RuntimeError::raise(Box::new(LongJumpRet));
unreachable!();
}
// extern "C" {
// fn setjmp(env: *mut c_void) -> c_int;
// fn longjmp(env: *mut c_void, val: c_int) -> !;
// }