auronandace
104 lines
2.3 KiB
Rust
104 lines
2.3 KiB
Rust
use crate::platform::types::{c_int, c_void};
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use alloc::vec::Vec;
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use core::cell::RefCell;
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use spin::Mutex;
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#[derive(Clone, Copy)]
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struct CxaAtExitFunc {
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func: extern "C" fn(*mut c_void),
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arg: usize,
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dso: usize,
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}
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#[derive(Clone, Copy)]
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struct CxaThreadAtExitFunc {
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func: extern "C" fn(*mut c_void),
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obj: *mut c_void,
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dso: *mut c_void,
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}
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static CXA_ATEXIT_FUNCS: Mutex<Vec<Option<CxaAtExitFunc>>> = Mutex::new(Vec::new());
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#[thread_local]
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static DTORS: RefCell<Vec<CxaThreadAtExitFunc>> = RefCell::new(Vec::new());
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#[unsafe(no_mangle)]
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pub unsafe extern "C" fn __cxa_atexit(
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func: Option<extern "C" fn(*mut c_void)>,
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arg: *mut c_void,
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dso: *mut c_void,
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) -> c_int {
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let Some(func) = func else {
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return 0;
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};
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let entry = CxaAtExitFunc {
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func,
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arg: arg as usize,
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dso: dso as usize,
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};
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let mut funcs = CXA_ATEXIT_FUNCS.lock();
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for slot in funcs.iter_mut() {
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if slot.is_none() {
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*slot = Some(entry);
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return 0;
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}
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}
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// No empty slots
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funcs.push(Some(entry));
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0
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}
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#[unsafe(no_mangle)]
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pub unsafe extern "C" fn __cxa_finalize(dso: *mut c_void) {
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let mut funcs = CXA_ATEXIT_FUNCS.lock();
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let dso_usize = dso as usize;
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for slot in funcs.iter_mut().rev() {
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if let Some(entry) = slot.as_ref()
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&& (dso.is_null() || entry.dso == dso_usize)
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&& let Some(entry_to_run) = slot.take()
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{
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(entry_to_run.func)(entry_to_run.arg as *mut c_void);
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}
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}
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// clean up remaining list
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if dso.is_null() {
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funcs.clear();
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} else {
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funcs.retain(|opt| opt.is_some());
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}
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}
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#[unsafe(no_mangle)]
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pub unsafe extern "C" fn __cxa_thread_atexit_impl(
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func: extern "C" fn(*mut c_void),
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obj: *mut c_void,
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dso: *mut c_void,
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) {
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let entry = CxaThreadAtExitFunc { func, obj, dso };
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DTORS.borrow_mut().push(entry);
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}
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// called internally
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pub unsafe fn __cxa_thread_finalize() {
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let mut dtors = DTORS.borrow_mut();
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while let Some(entry) = dtors.pop() {
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(entry.func)(entry.obj);
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}
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}
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#[unsafe(no_mangle)]
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pub unsafe extern "C" fn _ITM_deregisterTMCloneTable(_ptr: *mut c_void) {
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// No-op
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}
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#[unsafe(no_mangle)]
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pub unsafe extern "C" fn _ITM_registerTMCloneTable(_ptr: *mut c_void, _len: usize) {
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// No-op
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}
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