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[libcxxabi] Use the right calling convention for exception destructors on i386 Windows

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On Windows on i386, C++ member functions use a different calling
convention (`__thiscall`) than the default one for regular functions
(`__cdecl`). (On Windows on architectures other than i386, both calling
convention attributes are no-ops.)

This matches how libstdc++ declares these types.

This fixes the std/thread/futures/futures.{shared,unique}_future/dtor.pass.cpp
tests on i386 mingw.

Differential Revision: https://reviews.llvm.org/D124990
This commit is contained in:
Martin Storsjö 2022-05-04 15:50:24 +03:00
parent 448eabd754
commit aeb4907ed6
4 changed files with 10 additions and 4 deletions
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6
libcxxabi/include/__cxxabi_config.h
View File

@ -97,4 +97,10 @@
# define _LIBCXXABI_NO_EXCEPTIONS
#endif
#if defined(_WIN32)
#define _LIBCXXABI_DTOR_FUNC __thiscall
#else
#define _LIBCXXABI_DTOR_FUNC
#endif
#endif // ____CXXABI_CONFIG_H

2
libcxxabi/include/cxxabi.h
View File

@ -47,7 +47,7 @@ __cxa_free_exception(void *thrown_exception) throw();
// 2.4.3 Throwing the Exception Object
extern _LIBCXXABI_FUNC_VIS _LIBCXXABI_NORETURN void
__cxa_throw(void *thrown_exception, std::type_info *tinfo,
void (*dest)(void *));
void (_LIBCXXABI_DTOR_FUNC *dest)(void *));
// 2.5.3 Exception Handlers
extern _LIBCXXABI_FUNC_VIS void *

2
libcxxabi/src/cxa_exception.cpp
View File

@ -254,7 +254,7 @@ will call terminate, assuming that there was no handler for the
exception.
*/
void
__cxa_throw(void *thrown_object, std::type_info *tinfo, void (*dest)(void *)) {
__cxa_throw(void *thrown_object, std::type_info *tinfo, void (_LIBCXXABI_DTOR_FUNC *dest)(void *)) {
__cxa_eh_globals *globals = __cxa_get_globals();
__cxa_exception* exception_header = cxa_exception_from_thrown_object(thrown_object);

4
libcxxabi/src/cxa_exception.h
View File

@ -43,7 +43,7 @@ struct _LIBCXXABI_HIDDEN __cxa_exception {
// Manage the exception object itself.
std::type_info *exceptionType;
void (*exceptionDestructor)(void *);
void (_LIBCXXABI_DTOR_FUNC *exceptionDestructor)(void *);
std::unexpected_handler unexpectedHandler;
std::terminate_handler terminateHandler;
@ -81,7 +81,7 @@ struct _LIBCXXABI_HIDDEN __cxa_dependent_exception {
#endif
std::type_info *exceptionType;
void (*exceptionDestructor)(void *);
void (_LIBCXXABI_DTOR_FUNC *exceptionDestructor)(void *);
std::unexpected_handler unexpectedHandler;
std::terminate_handler terminateHandler;