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cxx: Add KConfig option for C++ exceptions, disable by default

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Fixes https://github.com/espressif/esp-idf/issues/1072

(Additional 20KB is still used if C++ exception support is enabled in
menuconfig.)
This commit is contained in:
Angus Gratton
2017-10-04 17:29:21 +11:00
committed by Angus Gratton
parent 6f07e0797d
commit 9c7477ef34
6 changed files with 122 additions and 1 deletions
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87
components/cxx/cxx_exception_stubs.cpp Normal file
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@@ -0,0 +1,87 @@
#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" void __cxx_fatal_exception_message(const char *msg)
{
printf("%s%s\n", FATAL_EXCEPTION, msg);
abort();
}
extern "C" void __cxx_fatal_exception_int(int i)
{
printf("%s (%d)\n", FATAL_EXCEPTION, i);
abort();
}
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")));
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")));
/* 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_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_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")));
#endif // CONFIG_CXX_EXCEPTIONS