On Windows libc exports __cxa_init_primary_exception, std::uncaught_exception
and std::uncaught_exceptions only as _nid_postfix symbols (GCC_GLOBAL_ALIAS
is empty there), so host modules bind libstdc++-6.dll's versions:
- std::make_exception_ptr, which std::promise's destructor uses for
broken_promise, allocated the exception with libc and initialized it with
libstdc++'s __cxa_init_primary_exception, whose header layout differs.
A test that makes one and rethrows it dies with an access violation.
- std::uncaught_exceptions read libstdc++'s thread state, which libc's
throws never touch, so it returned 0 while an exception unwound. The
AGC driver's deferred-label guard relies on it to tell a failed record
from a finished one.
The three are now exported natively, like __cxa_throw and the rest.
__cxa_init_primary_exception also sets the reference count to 0, as the
Itanium ABI does: the exception_ptr created next takes the only
reference, so a made exception is destroyed once instead of leaking.
BnMAMrsfVWo is _ZSt19_Throw_bad_weak_ptrv. Replace the unknown stub
with a throw of a guest std::bad_weak_ptr, and add its type info,
vtable, destructors and what().
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
PPSA16064 (Minecraft Dungeons II) ships its own libc.prx, which imports
two C++ runtime symbols from libSceLibcInternal that no host library
exported, so the title failed to load:
- std::__sce_v2::_Xbad_function_call() (_ZNSt8__sce_v219_Xbad_function_callEv),
the inline-namespace spelling of the existing std::_Xbad_function_call.
It throws std::bad_function_call the same way.
- operator delete(void*, std::size_t, std::align_val_t)
(_ZdlPvmSt11align_val_t), the sized form of the existing aligned
delete. It frees the pointer the same way and ignores the size.
application_heap_default frees an aligned block through the sized form
and checks that a null pointer frees nothing. exception_runtime checks
that the new thrower throws a standard exception; it is built only on
Linux and was not run here (Windows 11, MinGW GCC 15.2).
AlxcBTW
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