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#![no_std]
#![crate_type = "cdylib"]
// Allow a few unstable features because we create a panic
// runtime for native wasm exceptions from scratch
#![feature(core_intrinsics)]
#![feature(lang_items)]
#![feature(link_llvm_intrinsics)]
#![feature(panic_info_message)]
extern crate alloc;
/// This module allows us to use `Box`, `String`, ... even in no-std
mod arena_alloc;
/// This module allows logging text, even in no-std
mod logging;
/// This module allows exceptions, even in no-std
#[cfg(target_arch = "wasm32")]
mod panicking;
use alloc::boxed::Box;
use alloc::string::String;
struct LogOnDrop;
impl Drop for LogOnDrop {
fn drop(&mut self) {
logging::log_str("Dropped");
}
}
#[allow(unreachable_code)]
#[allow(unconditional_panic)]
#[no_mangle]
pub extern "C" fn start() -> usize {
let data = 0x1234usize as *mut u8; // Something to recognize
unsafe {
core::intrinsics::r#try(|data: *mut u8| {
let _log_on_drop = LogOnDrop;
logging::log_str(&alloc::format!("`r#try` called with ptr {:?}", data));
let x = [12];
let _ = x[4]; // should panic
logging::log_str("This line should not be visible! :(");
}, data, |data, exception| {
let exception = *Box::from_raw(exception as *mut String);
logging::log_str("Caught something!");
logging::log_str(&alloc::format!(" data : {:?}", data));
logging::log_str(&alloc::format!(" exception: {:?}", exception));
});
}
logging::log_str("This program terminates correctly.");
0
}
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