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Fix MinGW termination callbacks not being invoked

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This commit is contained in:
Amanieu d'Antras 2020-03-05 14:34:25 +00:00
parent 8e3467c215
commit 04f24b7c69
1 changed files with 16 additions and 17 deletions
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33
src/rtstartup/rsbegin.rs
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@ -60,37 +60,36 @@ pub mod eh_frames {
}
// Unwind info registration/deregistration routines.
// See the docs of `unwind` module in libstd.
// See the docs of libpanic_unwind.
extern "C" {
fn rust_eh_register_frames(eh_frame_begin: *const u8, object: *mut u8);
fn rust_eh_unregister_frames(eh_frame_begin: *const u8, object: *mut u8);
}
unsafe fn init() {
unsafe extern "C" fn init() {
// register unwind info on module startup
rust_eh_register_frames(&__EH_FRAME_BEGIN__ as *const u8, &mut OBJ as *mut _ as *mut u8);
}
unsafe fn uninit() {
unsafe extern "C" fn uninit() {
// unregister on shutdown
rust_eh_unregister_frames(&__EH_FRAME_BEGIN__ as *const u8, &mut OBJ as *mut _ as *mut u8);
}
// MSVC-specific init/uninit routine registration
pub mod ms_init {
// .CRT$X?? sections are roughly analogous to ELF's .init_array and .fini_array,
// except that they exploit the fact that linker will sort them alphabitically,
// so e.g., sections with names between .CRT$XIA and .CRT$XIZ are guaranteed to be
// placed between those two, without requiring any ordering of objects on the linker
// command line.
// Note that ordering of same-named sections from different objects is not guaranteed.
// Since .CRT$XIA contains init array's header symbol, which must always come first,
// we place our initialization callback into .CRT$XIB.
// MinGW-specific init/uninit routine registration
pub mod mingw_init {
// MinGW's startup objects (crt0.o / dllcrt0.o) will invoke global constructors in the
// .ctors and .dtors sections on startup and exit. In the case of DLLs, this is done when
// the DLL is loaded and unloaded.
//
// The linker will sort the sections, which ensures that our callbacks are located at the
// end of the list. Since constructors are run in reverse order, this ensures that our
// callbacks are the first and last ones executed.
#[link_section = ".CRT$XIB"] // .CRT$XI? : C initialization callbacks
pub static P_INIT: unsafe fn() = super::init;
#[link_section = ".ctors.65535"] // .ctors.* : C initialization callbacks
pub static P_INIT: unsafe extern "C" fn() = super::init;
#[link_section = ".CRT$XTY"] // .CRT$XT? : C termination callbacks
pub static P_UNINIT: unsafe fn() = super::uninit;
#[link_section = ".dtors.65535"] // .dtors.* : C termination callbacks
pub static P_UNINIT: unsafe extern "C" fn() = super::uninit;
}
}