#include <bits/c++config.h>
#include <cstdlib>
#include <exception_defines.h>
#include "unwind-cxx.h"
using namespace __cxxabiv1;
#include "unwind-pe.h"
struct lsda_header_info
{
_Unwind_Ptr Start;
_Unwind_Ptr LPStart;
_Unwind_Ptr ttype_base;
const unsigned char *TType;
const unsigned char *action_table;
unsigned char ttype_encoding;
unsigned char call_site_encoding;
};
static const unsigned char *
parse_lsda_header (_Unwind_Context *context, const unsigned char *p,
lsda_header_info *info)
{
_Unwind_Word tmp;
unsigned char lpstart_encoding;
info->Start = (context ? _Unwind_GetRegionStart (context) : 0);
lpstart_encoding = *p++;
if (lpstart_encoding != DW_EH_PE_omit)
p = read_encoded_value (context, lpstart_encoding, p, &info->LPStart);
else
info->LPStart = info->Start;
info->ttype_encoding = *p++;
if (info->ttype_encoding != DW_EH_PE_omit)
{
p = read_uleb128 (p, &tmp);
info->TType = p + tmp;
}
else
info->TType = 0;
info->call_site_encoding = *p++;
p = read_uleb128 (p, &tmp);
info->action_table = p + tmp;
return p;
}
static const std::type_info *
get_ttype_entry (lsda_header_info *info, _Unwind_Word i)
{
_Unwind_Ptr ptr;
i *= size_of_encoded_value (info->ttype_encoding);
read_encoded_value_with_base (info->ttype_encoding, info->ttype_base,
info->TType - i, &ptr);
return reinterpret_cast<const std::type_info *>(ptr);
}
static bool
get_adjusted_ptr (const std::type_info *catch_type,
const std::type_info *throw_type,
void **thrown_ptr_p)
{
void *thrown_ptr = *thrown_ptr_p;
if (throw_type->__is_pointer_p ())
thrown_ptr = *(void **) thrown_ptr;
if (catch_type->__do_catch (throw_type, &thrown_ptr, 1))
{
*thrown_ptr_p = thrown_ptr;
return true;
}
return false;
}
static bool
check_exception_spec (lsda_header_info *info, const std::type_info *throw_type,
void *thrown_ptr, _Unwind_Sword filter_value)
{
const unsigned char *e = info->TType - filter_value - 1;
while (1)
{
const std::type_info *catch_type;
_Unwind_Word tmp;
e = read_uleb128 (e, &tmp);
if (tmp == 0)
return false;
catch_type = get_ttype_entry (info, tmp);
if (get_adjusted_ptr (catch_type, throw_type, &thrown_ptr))
return true;
}
}
static bool
empty_exception_spec (lsda_header_info *info, _Unwind_Sword filter_value)
{
const unsigned char *e = info->TType - filter_value - 1;
_Unwind_Word tmp;
e = read_uleb128 (e, &tmp);
return tmp == 0;
}
#ifdef _GLIBCXX_SJLJ_EXCEPTIONS
#define PERSONALITY_FUNCTION __gxx_personality_sj0
#define __builtin_eh_return_data_regno(x) x
#else
#define PERSONALITY_FUNCTION __gxx_personality_v0
#endif
extern "C" _Unwind_Reason_Code
PERSONALITY_FUNCTION (int version,
_Unwind_Action actions,
_Unwind_Exception_Class exception_class,
struct _Unwind_Exception *ue_header,
struct _Unwind_Context *context)
{
__cxa_exception *xh = __get_exception_header_from_ue (ue_header);
enum found_handler_type
{
found_nothing,
found_terminate,
found_cleanup,
found_handler
} found_type;
lsda_header_info info;
const unsigned char *language_specific_data;
const unsigned char *action_record;
const unsigned char *p;
_Unwind_Ptr landing_pad, ip;
int handler_switch_value;
void *thrown_ptr = xh + 1;
if (version != 1)
return _URC_FATAL_PHASE1_ERROR;
if (actions == (_UA_CLEANUP_PHASE | _UA_HANDLER_FRAME)
&& exception_class == __gxx_exception_class)
{
handler_switch_value = xh->handlerSwitchValue;
language_specific_data = xh->languageSpecificData;
landing_pad = (_Unwind_Ptr) xh->catchTemp;
found_type = (landing_pad == 0 ? found_terminate : found_handler);
goto install_context;
}
language_specific_data = (const unsigned char *)
_Unwind_GetLanguageSpecificData (context);
if (! language_specific_data)
return _URC_CONTINUE_UNWIND;
p = parse_lsda_header (context, language_specific_data, &info);
info.ttype_base = base_of_encoded_value (info.ttype_encoding, context);
ip = _Unwind_GetIP (context) - 1;
landing_pad = 0;
action_record = 0;
handler_switch_value = 0;
#ifdef _GLIBCXX_SJLJ_EXCEPTIONS
if ((int) ip < 0)
return _URC_CONTINUE_UNWIND;
else if (ip == 0)
{
}
else
{
_Unwind_Word cs_lp, cs_action;
do
{
p = read_uleb128 (p, &cs_lp);
p = read_uleb128 (p, &cs_action);
}
while (--ip);
landing_pad = cs_lp + 1;
if (cs_action)
action_record = info.action_table + cs_action - 1;
goto found_something;
}
#else
while (p < info.action_table)
{
_Unwind_Ptr cs_start, cs_len, cs_lp;
_Unwind_Word cs_action;
p = read_encoded_value (0, info.call_site_encoding, p, &cs_start);
p = read_encoded_value (0, info.call_site_encoding, p, &cs_len);
p = read_encoded_value (0, info.call_site_encoding, p, &cs_lp);
p = read_uleb128 (p, &cs_action);
if (ip < info.Start + cs_start)
p = info.action_table;
else if (ip < info.Start + cs_start + cs_len)
{
if (cs_lp)
landing_pad = info.LPStart + cs_lp;
if (cs_action)
action_record = info.action_table + cs_action - 1;
goto found_something;
}
}
#endif // _GLIBCXX_SJLJ_EXCEPTIONS
found_type = found_terminate;
goto do_something;
found_something:
if (landing_pad == 0)
{
found_type = found_nothing;
}
else if (action_record == 0)
{
found_type = found_cleanup;
}
else
{
_Unwind_Sword ar_filter, ar_disp;
const std::type_info *throw_type, *catch_type;
bool saw_cleanup = false;
bool saw_handler = false;
if ((actions & _UA_FORCE_UNWIND)
|| exception_class != __gxx_exception_class)
throw_type = 0;
else
throw_type = xh->exceptionType;
while (1)
{
p = action_record;
p = read_sleb128 (p, &ar_filter);
read_sleb128 (p, &ar_disp);
if (ar_filter == 0)
{
saw_cleanup = true;
}
else if (ar_filter > 0)
{
catch_type = get_ttype_entry (&info, ar_filter);
if (! catch_type
|| (throw_type
&& get_adjusted_ptr (catch_type, throw_type,
&thrown_ptr)))
{
saw_handler = true;
break;
}
}
else
{
if (throw_type
? ! check_exception_spec (&info, throw_type, thrown_ptr,
ar_filter)
: empty_exception_spec (&info, ar_filter))
{
saw_handler = true;
break;
}
}
if (ar_disp == 0)
break;
action_record = p + ar_disp;
}
if (saw_handler)
{
handler_switch_value = ar_filter;
found_type = found_handler;
}
else
found_type = (saw_cleanup ? found_cleanup : found_nothing);
}
do_something:
if (found_type == found_nothing)
return _URC_CONTINUE_UNWIND;
if (actions & _UA_SEARCH_PHASE)
{
if (found_type == found_cleanup)
return _URC_CONTINUE_UNWIND;
if (exception_class == __gxx_exception_class)
{
xh->handlerSwitchValue = handler_switch_value;
xh->actionRecord = action_record;
xh->languageSpecificData = language_specific_data;
xh->adjustedPtr = thrown_ptr;
xh->catchTemp = landing_pad;
}
return _URC_HANDLER_FOUND;
}
install_context:
if ((actions & _UA_FORCE_UNWIND)
|| exception_class != __gxx_exception_class)
{
if (found_type == found_terminate)
std::terminate ();
else if (handler_switch_value < 0)
{
try
{ std::unexpected (); }
catch(...)
{ std::terminate (); }
}
}
else
{
if (found_type == found_terminate)
{
__cxa_begin_catch (&xh->unwindHeader);
__terminate (xh->terminateHandler);
}
if (handler_switch_value < 0)
{
parse_lsda_header (context, language_specific_data, &info);
xh->catchTemp = base_of_encoded_value (info.ttype_encoding, context);
}
}
_Unwind_SetGR (context, __builtin_eh_return_data_regno (0),
__builtin_extend_pointer (&xh->unwindHeader));
_Unwind_SetGR (context, __builtin_eh_return_data_regno (1),
handler_switch_value);
_Unwind_SetIP (context, landing_pad);
return _URC_INSTALL_CONTEXT;
}
extern "C" void
__cxa_call_unexpected (void *exc_obj_in)
{
_Unwind_Exception *exc_obj
= reinterpret_cast <_Unwind_Exception *>(exc_obj_in);
__cxa_begin_catch (exc_obj);
struct end_catch_protect
{
end_catch_protect() { }
~end_catch_protect() { __cxa_end_catch(); }
} end_catch_protect_obj;
lsda_header_info info;
__cxa_exception *xh = __get_exception_header_from_ue (exc_obj);
const unsigned char *xh_lsda;
_Unwind_Sword xh_switch_value;
std::terminate_handler xh_terminate_handler;
xh_lsda = xh->languageSpecificData;
xh_switch_value = xh->handlerSwitchValue;
xh_terminate_handler = xh->terminateHandler;
info.ttype_base = (_Unwind_Ptr) xh->catchTemp;
try
{ __unexpected (xh->unexpectedHandler); }
catch(...)
{
__cxa_eh_globals *globals = __cxa_get_globals_fast ();
__cxa_exception *new_xh = globals->caughtExceptions;
void *new_ptr = new_xh + 1;
parse_lsda_header (0, xh_lsda, &info);
if (check_exception_spec (&info, new_xh->exceptionType,
new_ptr, xh_switch_value))
__throw_exception_again;
#ifdef __EXCEPTIONS
const std::type_info &bad_exc = typeid (std::bad_exception);
if (check_exception_spec (&info, &bad_exc, 0, xh_switch_value))
throw std::bad_exception();
#endif
__terminate (xh_terminate_handler);
}
}