library/panic_abort/src/lib.rs

//! Implementation of Rust panics via process aborts
//!
//! When compared to the implementation via unwinding, this crate is *much*
//! simpler! That being said, it's not quite as versatile, but here goes!

#![no_std]
#![unstable(feature = "panic_abort", issue = "32837")]
#![doc(issue_tracker_base_url = "https://github.com/rust-lang/rust/issues/")]
#![panic_runtime]
#![feature(panic_runtime)]
#![feature(std_internals)]
#![feature(staged_api)]
#![feature(rustc_attrs)]
#![allow(internal_features)]

#[cfg(target_os = "android")]
mod android;

#[cfg(target_os = "zkvm")]
mod zkvm;

use core::any::Any;
use core::panic::PanicPayload;

#[rustc_std_internal_symbol]
#[allow(improper_ctypes_definitions)]
pub unsafe extern "C" fn __rust_panic_cleanup(_: *mut u8) -> *mut (dyn Any + Send + 'static) {
    unreachable!()
}

// "Leak" the payload and shim to the relevant abort on the platform in question.
#[rustc_std_internal_symbol]
pub unsafe fn __rust_start_panic(_payload: &mut dyn PanicPayload) -> u32 {
    // Android has the ability to attach a message as part of the abort.
    #[cfg(target_os = "android")]
    unsafe {
        android::android_set_abort_message(_payload);
    }
    #[cfg(target_os = "zkvm")]
    unsafe {
        zkvm::zkvm_set_abort_message(_payload);
    }

    unsafe extern "Rust" {
        // This is defined in std::rt.
        #[rustc_std_internal_symbol]
        safe fn __rust_abort() -> !;
    }

    __rust_abort()
}