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//! Unwinding for *emscripten* target.
//!
//! Whereas Rust's usual unwinding implementation for Unix platforms
//! calls into the libunwind APIs directly, on Emscripten we instead
//! call into the C++ unwinding APIs. This is just an expedience since
//! Emscripten's runtime always implements those APIs and does not
//! implement libunwind.
#![allow(private_no_mangle_fns)]
use core::any::Any;
use core::ptr;
use core::mem;
use alloc::boxed::Box;
use libc::{self, c_int};
use unwind as uw;
pub fn payload() -> *mut u8 {
ptr::null_mut()
}
pub unsafe fn cleanup(ptr: *mut u8) -> Box<dyn Any + Send> {
assert!(!ptr.is_null());
let ex = ptr::read(ptr as *mut _);
__cxa_free_exception(ptr as *mut _);
ex
}
pub unsafe fn panic(data: Box<dyn Any + Send>) -> u32 {
let sz = mem::size_of_val(&data);
let exception = __cxa_allocate_exception(sz);
if exception == ptr::null_mut() {
return uw::_URC_FATAL_PHASE1_ERROR as u32;
}
let exception = exception as *mut Box<dyn Any + Send>;
ptr::write(exception, data);
__cxa_throw(exception as *mut _, ptr::null_mut(), ptr::null_mut());
unreachable!()
}
#[lang = "eh_personality"]
#[no_mangle]
unsafe extern "C" fn rust_eh_personality(version: c_int,
actions: uw::_Unwind_Action,
exception_class: uw::_Unwind_Exception_Class,
exception_object: *mut uw::_Unwind_Exception,
context: *mut uw::_Unwind_Context)
-> uw::_Unwind_Reason_Code {
__gxx_personality_v0(version, actions, exception_class, exception_object, context)
}
extern "C" {
fn __cxa_allocate_exception(thrown_size: libc::size_t) -> *mut libc::c_void;
fn __cxa_free_exception(thrown_exception: *mut libc::c_void);
fn __cxa_throw(thrown_exception: *mut libc::c_void,
tinfo: *mut libc::c_void,
dest: *mut libc::c_void);
fn __gxx_personality_v0(version: c_int,
actions: uw::_Unwind_Action,
exception_class: uw::_Unwind_Exception_Class,
exception_object: *mut uw::_Unwind_Exception,
context: *mut uw::_Unwind_Context)
-> uw::_Unwind_Reason_Code;
}
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