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Explain the panic! in exception_copy

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This commit is contained in:
Amanieu d'Antras 2020-01-01 22:14:37 +01:00
parent 4361192112
commit 838e3874fc
1 changed files with 8 additions and 0 deletions
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8
src/libpanic_unwind/seh.rs
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@ -218,6 +218,12 @@ static mut TYPE_DESCRIPTOR: _TypeDescriptor = _TypeDescriptor {
//
// Note that x86 Windows uses the "thiscall" calling convention for C++ member
// functions instead of the default "C" calling convention.
//
// The exception_copy function is a bit special here: it is invoked by the MSVC
// runtime under a try/catch block and the panic that we generate here will be
// used as the result of the exception copy. This is used by the C++ runtime to
// support capturing exceptions with std::exception_ptr, which we can't support
// because Box<dyn Any> isn't clonable.
cfg_if::cfg_if! {
if #[cfg(target_arch = "x86")] {
unsafe extern "thiscall" fn exception_cleanup(e: *mut [u64; 2]) {
@ -225,6 +231,7 @@ cfg_if::cfg_if! {
cleanup(*e);
}
}
#[unwind(allowed)]
unsafe extern "thiscall" fn exception_copy(_dest: *mut [u64; 2],
_src: *mut [u64; 2])
-> *mut [u64; 2] {
@ -236,6 +243,7 @@ cfg_if::cfg_if! {
cleanup(*e);
}
}
#[unwind(allowed)]
unsafe extern "C" fn exception_copy(_dest: *mut [u64; 2],
_src: *mut [u64; 2])
-> *mut [u64; 2] {