ostd 0.17.2

Rust OS framework that facilitates the development of and innovation in OS kernels
Documentation 
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// SPDX-License-Identifier: MPL-2.0

//! Support for the code coverage feature of OSDK.
//!
//! For more information about the code coverage feature (`cargo osdk run --coverage`),
//! check out the OSDK reference manual.

use alloc::vec::Vec;
use core::mem::ManuallyDrop;

use spin::Once;

use crate::sync::SpinLock;

/// A hook that is invoked when the system exits to dump the code coverage data.
pub(crate) fn on_system_exit() {
    static COVERAGE_DATA: Once<Vec<u8>> = Once::new();

    let coverage = COVERAGE_DATA.call_once(|| {
        let mut coverage = Vec::new();
        // SAFETY: `call_once` guarantees that this function will not be called concurrently by
        // multiple threads.
        unsafe { minicov::capture_coverage(&mut coverage).unwrap() };
        coverage
    });

    crate::early_println!("#### Coverage: {:p} {}", coverage.as_ptr(), coverage.len());
}