OVMS3-idf/components/cxx/cxx_exception_stubs.cpp
Alexey Gerenkov e0f7e196f2 cxx: don’t define stubs for __throw_* functions
If exception support is disabled in IDF, and libstdc++ tries to throw
an exception, it will call __cxa_allocate_exception which is replaced
with abort in IDF.

We have a dramatically size reduction of the RO-section in binary when using '__throw_'-stubs in GCC5
In the case of using GCC8, we are faced with 'multiple definition' errors when using '__throw_'-stubs.
Good that we don't have the size problem due to gcc8
2018-09-20 18:53:15 +08:00

84 lines
3.9 KiB
C++

#include <cstdlib>
#include <cstdio>
#include <exception>
#include <bits/functexcept.h>
#include <sdkconfig.h>
#ifndef CONFIG_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();
}
#if !GCC_NOT_5_2_0
void std::__throw_bad_exception(void) __attribute__((alias("__cxx_fatal_exception")));
void std::__throw_bad_alloc(void) __attribute__((alias("__cxx_fatal_exception")));
void std::__throw_bad_cast(void) __attribute__((alias("__cxx_fatal_exception")));
void std::__throw_bad_typeid(void) __attribute__((alias("__cxx_fatal_exception")));
void std::__throw_logic_error(const char*) __attribute__((alias("__cxx_fatal_exception_message")));
void std::__throw_domain_error(const char*) __attribute__((alias("__cxx_fatal_exception_message")));
void std::__throw_invalid_argument(const char*) __attribute__((alias("__cxx_fatal_exception_message")));
void std::__throw_length_error(const char*) __attribute__((alias("__cxx_fatal_exception_message")));
void std::__throw_out_of_range(const char*) __attribute__((alias("__cxx_fatal_exception_message")));
void std::__throw_out_of_range_fmt(const char*, ...) __attribute__((alias("__cxx_fatal_exception_message_va")));
void std::__throw_runtime_error(const char*) __attribute__((alias("__cxx_fatal_exception_message")));
void std::__throw_range_error(const char*) __attribute__((alias("__cxx_fatal_exception_message")));
void std::__throw_overflow_error(const char*) __attribute__((alias("__cxx_fatal_exception_message")));
void std::__throw_underflow_error(const char*) __attribute__((alias("__cxx_fatal_exception_message")));
void std::__throw_ios_failure(const char*) __attribute__((alias("__cxx_fatal_exception_message")));
void std::__throw_system_error(int) __attribute__((alias("__cxx_fatal_exception_int")));
void std::__throw_bad_function_call(void) __attribute__((alias("__cxx_fatal_exception")));
void std::__throw_future_error(int) __attribute__((alias("__cxx_fatal_exception_int")));
#endif
/* 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_CXX_EXCEPTIONS