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[C++]: wrapper functions around unwind code

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* Replaced all C++ exception related
  functions with wrappers if -fno-exception
  is used. This prevents linking of the
  corresponding code in libgcc. The code
  size will decrease by around 7-9 KB when
  building with -fno-exception.
* added no except test app

Closes https://github.com/espressif/esp-idf/pull/5380
Closes https://github.com/espressif/esp-idf/issues/5363
Closes https://github.com/espressif/esp-idf/issues/5224
Closes IDFGH-3153
Closes IDF-2577
This commit is contained in:
Jakob Hasse
2021-02-07 16:51:52 +08:00
parent 2554d8956a
commit 2552c7ba0f
9 changed files with 246 additions and 36 deletions
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186
components/cxx/cxx_exception_stubs.cpp
View File

@@ -6,58 +6,178 @@
#ifndef CONFIG_COMPILER_CXX_EXCEPTIONS
const char *FATAL_EXCEPTION = "Fatal C++ exception: ";
extern "C" void __cxx_fatal_exception(void)
extern "C" void abort_expect_void(const void *context)
{
abort();
}
extern "C" bool __cxx_fatal_exception_bool(void)
extern "C" void *abort_expect_void_and_return(const void *context)
{
__cxx_fatal_exception();
return false;
abort();
return nullptr;
}
extern "C" void __cxx_fatal_exception_message(const char *msg)
extern "C" void *forward_abort_uw_ctx(struct _Unwind_Context *context)
{
return abort_expect_void_and_return((void*) context);
}
template<typename T>
static T abort_return()
{
abort();
return static_cast<T>(0);
}
// unwind-dw2-fde.o
extern "C" void __wrap__Unwind_SetEnableExceptionFdeSorting(unsigned char enable)
{
printf("%s%s\n", FATAL_EXCEPTION, msg);
abort();
}
extern "C" void __cxx_fatal_exception_message_va(const char *msg, ...)
extern "C" void __wrap___register_frame_info_bases (const void *begin, struct object *ob, void *tbase, void *dbase)
{
__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.
extern "C" void __wrap___register_frame_info (const void *begin, struct object *ob)
{
abort();
}
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).
extern "C" void __wrap___register_frame_info_table_bases (void *begin, struct object *ob, void *tbase, void *dbase)
{
abort();
}
If these are left out, a bunch of unwanted exception handler code is linked.
extern "C" void __wrap___register_frame_info_table (void *begin, struct object *ob)
{
abort();
}
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")));
extern "C" void __wrap___register_frame (void *begin)
__attribute__((alias("abort_expect_void")));
bool std::uncaught_exception() __attribute__((alias("__cxx_fatal_exception_bool")));
extern "C" void __wrap___register_frame_table (void *begin)
__attribute__((alias("abort_expect_void")));
extern "C" void *__wrap___deregister_frame_info_bases (const void *begin)
__attribute__((alias("abort_expect_void_and_return")));
extern "C" void *__wrap___deregister_frame_info (const void *begin)
__attribute__((alias("abort_expect_void_and_return")));
extern "C" void __wrap___deregister_frame (void *begin)
__attribute__((alias("abort_expect_void")));
typedef void* fde;
extern "C" const fde * __wrap__Unwind_Find_FDE (void *pc, struct dwarf_eh_bases *bases)
{
return abort_return<fde*>();
}
// unwind-dw2.o (riscv), unwind-dw2-xtensa.o (xtensa)
typedef void* _Unwind_Ptr;
typedef int _Unwind_Word;
extern "C" _Unwind_Word __wrap__Unwind_GetGR (struct _Unwind_Context *context, int index)
{
return abort_return<_Unwind_Word>();
}
extern "C" _Unwind_Word __wrap__Unwind_GetCFA (struct _Unwind_Context *context)
{
return abort_return<_Unwind_Word>();
}
extern "C" void __wrap__Unwind_SetIP (struct _Unwind_Context *context, _Unwind_Ptr val)
{
abort();
}
extern "C" void __wrap__Unwind_SetGR (struct _Unwind_Context *context, int index, _Unwind_Word val)
{
abort();
}
extern "C" _Unwind_Ptr __wrap__Unwind_GetIPInfo (struct _Unwind_Context *context, int *ip_before_insn)
{
return abort_return<_Unwind_Ptr>();
}
extern "C" _Unwind_Ptr __wrap__Unwind_GetIP (struct _Unwind_Context *context)
__attribute__((alias("forward_abort_uw_ctx")));
extern "C" _Unwind_Ptr __wrap__Unwind_GetRegionStart (struct _Unwind_Context *context)
__attribute__((alias("forward_abort_uw_ctx")));
extern "C" _Unwind_Ptr __wrap__Unwind_GetDataRelBase (struct _Unwind_Context *context)
__attribute__((alias("forward_abort_uw_ctx")));
extern "C" _Unwind_Ptr __wrap__Unwind_GetTextRelBase (struct _Unwind_Context *context)
__attribute__((alias("forward_abort_uw_ctx")));
extern "C" void *__wrap__Unwind_GetLanguageSpecificData (struct _Unwind_Context *context)
__attribute__((alias("forward_abort_uw_ctx")));
extern "C" void *__wrap__Unwind_FindEnclosingFunction (void *pc)
__attribute__((alias("abort_expect_void_and_return")));
struct frame_state *__frame_state_for (void *pc_target, struct frame_state *state_in)
{
return abort_return<struct frame_state *>();
}
// unwind.inc
typedef int _Unwind_Reason_Code;
typedef int _Unwind_Action;
typedef int _Unwind_Exception_Class;
typedef int* _Unwind_Trace_Fn;
typedef int* _Unwind_Stop_Fn;
extern "C" void __wrap__Unwind_Resume (struct _Unwind_Exception *exc)
{
abort();
}
extern "C" void __wrap__Unwind_DeleteException (struct _Unwind_Exception *exc)
{
abort();
}
extern "C" _Unwind_Reason_Code __wrap__Unwind_RaiseException(struct _Unwind_Exception *exc)
{
return abort_return<_Unwind_Reason_Code>();
}
extern "C" _Unwind_Reason_Code __wrap__Unwind_Resume_or_Rethrow (struct _Unwind_Exception *exc)
__attribute__((alias("__wrap__Unwind_RaiseException")));
extern "C" _Unwind_Reason_Code __wrap__Unwind_ForcedUnwind (struct _Unwind_Exception *exc,
_Unwind_Stop_Fn stop, void * stop_argument)
{
return abort_return<_Unwind_Reason_Code>();
}
extern "C" _Unwind_Reason_Code __wrap__Unwind_Backtrace(_Unwind_Trace_Fn trace, void * trace_argument)
{
return abort_return<_Unwind_Reason_Code>();
}
// eh_personality.o
extern "C" void __wrap___cxa_call_unexpected (void *exc_obj_in)
__attribute__((alias("abort_expect_void")));
extern "C" _Unwind_Reason_Code __wrap___gxx_personality_v0 (int version,
_Unwind_Action actions,
_Unwind_Exception_Class exception_class,
struct _Unwind_Exception *ue_header,
struct _Unwind_Context *context)
{
return abort_return<_Unwind_Reason_Code>();
}
#endif // CONFIG_COMPILER_CXX_EXCEPTIONS