esp-idf/components/cxx/cxx_exception_stubs.cpp

#include <cstdlib>
#include <cstdio>
#include <exception>
#include <bits/functexcept.h>
#include <sdkconfig.h>

#ifndef CONFIG_COMPILER_CXX_EXCEPTIONS

const char *FATAL_EXCEPTION = "Fatal C++ exception: ";

extern "C" void __cxx_fatal_exception(void)
{
    abort();
}

extern "C" bool __cxx_fatal_exception_bool(void)
{
    __cxx_fatal_exception();
    return false;
}

extern "C" void __cxx_fatal_exception_message(const char *msg)
{
    printf("%s%s\n", FATAL_EXCEPTION, msg);
    abort();
}

extern "C" void __cxx_fatal_exception_message_va(const char *msg, ...)
{
    __cxx_fatal_exception_message(msg);
}

extern "C" void __cxx_fatal_exception_int(int i)
{
    printf("%s (%d)\n", FATAL_EXCEPTION, i);
    abort();
}

/* The following definitions are needed because libstdc++ is also compiled with
   __throw_exception_again defined to throw, and some other exception code in a few places.

   This cause exception handler code to be emitted in the library even though it's mostly
   unreachable (as any libstdc++ "throw" will first call one of the above stubs, which will abort).

   If these are left out, a bunch of unwanted exception handler code is linked.

   Note: these function prototypes are not correct.
*/

extern "C" void __cxa_allocate_exception(void) __attribute__((alias("__cxx_fatal_exception")));
extern "C" void __cxa_allocate_dependent_exception(void) __attribute__((alias("__cxx_fatal_exception")));
extern "C" void __cxa_begin_catch(void) __attribute__((alias("__cxx_fatal_exception")));
extern "C" void __cxa_end_catch(void) __attribute__((alias("__cxx_fatal_exception")));
extern "C" void __cxa_get_exception_ptr(void) __attribute__((alias("__cxx_fatal_exception")));
extern "C" void __cxa_free_exception(void) __attribute__((alias("__cxx_fatal_exception")));
extern "C" void __cxa_free_dependent_exception(void) __attribute__((alias("__cxx_fatal_exception")));
extern "C" void __cxa_rethrow(void) __attribute__((alias("__cxx_fatal_exception")));
extern "C" void __cxa_throw(void) __attribute__((alias("__cxx_fatal_exception")));
extern "C" void __cxa_call_terminate(void) __attribute__((alias("__cxx_fatal_exception")));

bool std::uncaught_exception() __attribute__((alias("__cxx_fatal_exception_bool")));

#endif // CONFIG_COMPILER_CXX_EXCEPTIONS