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libsupc++: Make the destructor parameter to __cxa_thread_atexit() use the __thiscall calling convention for i686-w64-mingw32

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The mingw-w64 implementations of `__cxa_thread_atexit()` and `__cxa_atexit()` have been
using `__thiscall` since two years ago. Using the default calling convention (which is
`__cdecl`) causes crashes as explained in PR83562.

Calling conventions have no effect on x86_64-w64-mingw32.

Reference: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83562
Reference: https://sourceforge.net/p/mingw-w64/mingw-w64/ci/master/tree/mingw-w64-crt/crt/cxa_thread_atexit.c
Reference: f3e0fbb40c/
Reference: https://github.com/msys2/MINGW-packages/issues/7071
Signed-off-by: Liu Hao <lh_mouse@126.com>

    2020-10-08  Liu Hao  <lh_mouse@126.com>

	libstdc++-v3:
	* libsupc++/cxxabi.h: (__cxa_atexit): mark with _GLIBCXX_CDTOR_CALLABI
	(__cxa_thread_atexit): ditto
	* libsupc++/atexit_thread.cc: (__cxa_atexit): mark with
	_GLIBCXX_CDTOR_CALLABI
	(__cxa_thread_atexit): ditto
	(elt): ditto
This commit is contained in:
Liu Hao 2020-10-08 10:26:13 +08:00 committed by Jonathan Yong
parent 44cab2d8fd
commit 7fc0f78c3f
2 changed files with 18 additions and 4 deletions
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14
libstdc++-v3/libsupc++/atexit_thread.cc
View File

@ -30,16 +30,21 @@
#include <windows.h>
#endif
// Simplify it a little for this file.
#ifndef _GLIBCXX_CDTOR_CALLABI
# define _GLIBCXX_CDTOR_CALLABI
#endif
#if _GLIBCXX_HAVE___CXA_THREAD_ATEXIT
// Libc provides __cxa_thread_atexit definition.
#elif _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
extern "C" int __cxa_thread_atexit_impl (void (*func) (void *),
extern "C" int __cxa_thread_atexit_impl (void (_GLIBCXX_CDTOR_CALLABI *func) (void *),
void *arg, void *d);
extern "C" int
__cxxabiv1::__cxa_thread_atexit (void (*dtor)(void *),
__cxxabiv1::__cxa_thread_atexit (void (_GLIBCXX_CDTOR_CALLABI *dtor)(void *),
void *obj, void *dso_handle)
_GLIBCXX_NOTHROW
{
@ -52,7 +57,7 @@ namespace {
// One element in a singly-linked stack of cleanups.
struct elt
{
void (*destructor)(void *);
void (_GLIBCXX_CDTOR_CALLABI *destructor)(void *);
void *object;
elt *next;
#ifdef _GLIBCXX_THREAD_ATEXIT_WIN32
@ -116,7 +121,8 @@ namespace {
}
extern "C" int
__cxxabiv1::__cxa_thread_atexit (void (*dtor)(void *), void *obj, void */*dso_handle*/)
__cxxabiv1::__cxa_thread_atexit (void (_GLIBCXX_CDTOR_CALLABI *dtor)(void *),
void *obj, void */*dso_handle*/)
_GLIBCXX_NOTHROW
{
// Do this initialization once.

8
libstdc++-v3/libsupc++/cxxabi.h
View File

@ -125,14 +125,22 @@ namespace __cxxabiv1
// DSO destruction.
int
#ifdef _GLIBCXX_CDTOR_CALLABI
__cxa_atexit(void (_GLIBCXX_CDTOR_CALLABI *)(void*), void*, void*) _GLIBCXX_NOTHROW;
#else
__cxa_atexit(void (*)(void*), void*, void*) _GLIBCXX_NOTHROW;
#endif
void
__cxa_finalize(void*);
// TLS destruction.
int
#ifdef _GLIBCXX_CDTOR_CALLABI
__cxa_thread_atexit(void (_GLIBCXX_CDTOR_CALLABI *)(void*), void*, void *) _GLIBCXX_NOTHROW;
#else
__cxa_thread_atexit(void (*)(void*), void*, void *) _GLIBCXX_NOTHROW;
#endif
// Pure virtual functions.
void