static void
get_region_description_for (_Unwind_Context *uw_context,
region_descriptor *region)
{
const unsigned char * p;
_uleb128_t tmp;
unsigned char lpbase_encoding;
/* Get the base address of the lsda information. If the provided context
is null or if there is no associated language specific data, there's
nothing we can/should do. */
region->lsda
= (_Unwind_Ptr) (uw_context
? _Unwind_GetLanguageSpecificData (uw_context) : 0);
if (! region->lsda)
return;
/* Parse the lsda and fill the region descriptor. */
p = (const unsigned char *)region->lsda;
region->base = _Unwind_GetRegionStart (uw_context);
/* Find @LPStart, the base to which landing pad offsets are relative. */
lpbase_encoding = *p++;
if (lpbase_encoding != DW_EH_PE_omit)
p = read_encoded_value
(uw_context, lpbase_encoding, p, ®ion->lp_base);
else
region->lp_base = region->base;
/* Find @TType, the base of the handler and exception spec type data. */
region->ttype_encoding = *p++;
if (region->ttype_encoding != DW_EH_PE_omit)
{
p = read_uleb128 (p, &tmp);
region->ttype_table = p + tmp;
}
else
region->ttype_table = 0;
region->ttype_base
= base_of_encoded_value (region->ttype_encoding, uw_context);
/* Get the encoding and length of the call-site table; the action table
immediately follows. */
region->call_site_encoding = *p++;
region->call_site_table = read_uleb128 (p, &tmp);
region->action_table = region->call_site_table + tmp;
}
_Unwind_Reason_Code __runa_personality(int version,
_Unwind_Action actions, _Unwind_Exception_Class exception_class,
struct _Unwind_Exception *ue_header, struct _Unwind_Context *context) {
enum found_handler_type {
found_nothing, found_terminate, found_cleanup, found_handler
} found_type;
struct 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 = 0;
bool foreign_exception;
int ip_before_insn = 0;
//__cxa_exception* xh = __get_exception_header_from_ue(ue_header);
// Interface version check.
if (version != 1)
return _URC_FATAL_PHASE1_ERROR;
foreign_exception = exception_class != RUNA_CLASS;
// Shortcut for phase 2 found handler for domestic exception.
if (actions == (_UA_CLEANUP_PHASE | _UA_HANDLER_FRAME) && !foreign_exception) {
restore_caught_exception(ue_header, &handler_switch_value,
&language_specific_data, &landing_pad);
found_type = (landing_pad == 0 ? found_terminate : found_handler);
goto install_context;
}
language_specific_data = (const unsigned char *) _Unwind_GetLanguageSpecificData(context);
// If no LSDA, then there are no handlers or cleanups.
if (!language_specific_data)
return _URC_CONTINUE_UNWIND;
// Parse the LSDA header.
p = parse_lsda_header(context, language_specific_data, &info);
info.ttype_base = base_of_encoded_value(info.ttype_encoding, context);
ip = _Unwind_GetIPInfo(context, &ip_before_insn);
//ip = _Unwind_GetIP(context);
if (!ip_before_insn)
--ip;
landing_pad = 0;
action_record = 0;
handler_switch_value = 0;
// Search the call-site table for the action associated with this IP.
while (p < info.action_table) {
_Unwind_Ptr cs_start, cs_len, cs_lp;
_uleb128_t cs_action;
// Note that all call-site encodings are "absolute" displacements.
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);
// The table is sorted, so if we've passed the ip, stop.
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;
}
}
// If ip is not present in the table, call terminate. This is for
// a destructor inside a cleanup, or a library routine the compiler
// was not expecting to throw.
found_type = found_terminate;
goto do_something;
found_something:
if (landing_pad == 0) {
// If ip is present, and has a null landing pad, there are
// no cleanups or handlers to be run.
found_type = found_nothing;
} else if (action_record == 0) {
// If ip is present, has a non-null landing pad, and a null
// action table offset, then there are only cleanups present.
// Cleanups use a zero switch value, as set above.
found_type = found_cleanup;
} else {
// Otherwise we have a catch handler or exception specification.
_sleb128_t ar_filter, ar_disp;
//const std::type_info* catch_type;
//_throw_typet* throw_type;
bool saw_cleanup = false;
bool saw_handler = false;
{
//thrown_ptr = __get_object_from_ue(ue_header);
//throw_type = __get_exception_header_from_obj(thrown_ptr)->exceptionType;
}
while (1) {
p = action_record;
p = read_sleb128(p, &ar_filter);
read_sleb128(p, &ar_disp);
if (ar_filter == 0) {
// Zero filter values are cleanups.
saw_cleanup = true;
} else if (ar_filter > 0) {
// Positive filter values are handlers.
//catch_type = get_ttype_entry(&info, ar_filter);
//printf("positive filter value -- handler found\n");
saw_handler = true;
break;
// Null catch type is a catch-all handler; we can catch foreign
// exceptions with this. Otherwise we must match types.
//if (!catch_type || (throw_type &&
// get_adjusted_ptr(catch_type, throw_type, &thrown_ptr))) {
// saw_handler = true;
// break;
//}
} else {
printf("negative filter value -- exception spec\n");
// Negative filter values are exception specifications.
// ??? How do foreign exceptions fit in? As far as I can
// see we can't match because there's no __cxa_exception
// object to stuff bits in for __cxa_call_unexpected to use.
// Allow them iff the exception spec is non-empty. I.e.
// a throw() specification results in __unexpected.
//if ((throw_type && !(actions & _UA_FORCE_UNWIND) && !foreign_exception) ?
// !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;
// For domestic exceptions, we cache data from phase 1 for phase 2.
if (!foreign_exception) {
save_caught_exception(ue_header, handler_switch_value,
language_specific_data, landing_pad);
}
return _URC_HANDLER_FOUND;
}
install_context:
// We can't use any of the cxa routines with foreign exceptions,
// because they all expect ue_header to be a struct __cxa_exception.
// So in that case, call terminate or unexpected directly.
if ((actions & _UA_FORCE_UNWIND) || foreign_exception) {
if (found_type == found_terminate)
abort(); // std::terminate();
else if (handler_switch_value < 0) {
printf("WTF\n");
//__try
// { std::unexpected (); }
//__catch(...)
// { std::terminate (); }
}
} else {
if (found_type == found_terminate)
abort(); //__cxa_call_terminate(ue_header);
// Cache the TType base value for __cxa_call_unexpected, as we won't
// have an _Unwind_Context then.
if (handler_switch_value < 0) {
parse_lsda_header(context, language_specific_data, &info);
info.ttype_base = base_of_encoded_value(info.ttype_encoding, context);
//xh->catchTemp = base_of_encoded_value (info.ttype_encoding, context);
}
}
/* For targets with pointers smaller than the word size, we must extend the
pointer, and this extension is target dependent. */
_Unwind_SetGR(context, __builtin_eh_return_data_regno(0), __builtin_extend_pointer(ue_header));
_Unwind_SetGR(context, __builtin_eh_return_data_regno(1), handler_switch_value);
_Unwind_SetIP(context, landing_pad);
return _URC_INSTALL_CONTEXT;
}
PERSONALITY_FUNCTION (int version,
_Unwind_Action actions,
_Unwind_Exception_Class exception_class,
struct _Unwind_Exception *ue_header,
struct _Unwind_Context *context)
#endif
{
struct ObjcException *xh = (struct ObjcException *) ue_header;
struct 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;
int saw_cleanup = 0, saw_handler;
void *return_object;
int foreign_exception;
int ip_before_insn = 0;
#ifdef __ARM_EABI_UNWINDER__
_Unwind_Action actions;
switch (state & _US_ACTION_MASK)
{
case _US_VIRTUAL_UNWIND_FRAME:
actions = _UA_SEARCH_PHASE;
break;
case _US_UNWIND_FRAME_STARTING:
actions = _UA_CLEANUP_PHASE;
if (!(state & _US_FORCE_UNWIND)
&& ue_header->barrier_cache.sp == _Unwind_GetGR(context, 13))
actions |= _UA_HANDLER_FRAME;
break;
case _US_UNWIND_FRAME_RESUME:
CONTINUE_UNWINDING;
break;
default:
abort();
}
actions |= state & _US_FORCE_UNWIND;
foreign_exception = 0;
ip = (_Unwind_Ptr) ue_header;
_Unwind_SetGR(context, 12, ip);
#else
/* Interface version check. */
if (version != 1)
return _URC_FATAL_PHASE1_ERROR;
foreign_exception = !(exception_class == __objc_exception_class);
#endif
/* Shortcut for phase 2 found handler for domestic exception. */
if (actions == (_UA_CLEANUP_PHASE | _UA_HANDLER_FRAME)
&& !foreign_exception)
{
#ifdef __ARM_EABI_UNWINDER__
handler_switch_value = (int) ue_header->barrier_cache.bitpattern[1];
landing_pad = (_Unwind_Ptr) ue_header->barrier_cache.bitpattern[3];
#else
handler_switch_value = xh->handlerSwitchValue;
landing_pad = xh->landingPad;
#endif
goto install_context;
}
language_specific_data = (const unsigned char *)
_Unwind_GetLanguageSpecificData (context);
/* If no LSDA, then there are no handlers or cleanups. */
if (! language_specific_data)
CONTINUE_UNWINDING;
/* Parse the LSDA header. */
p = parse_lsda_header (context, language_specific_data, &info);
info.ttype_base = base_of_encoded_value (info.ttype_encoding, context);
#ifdef HAVE_GETIPINFO
ip = _Unwind_GetIPInfo (context, &ip_before_insn);
#else
ip = _Unwind_GetIP (context);
#endif
if (! ip_before_insn)
--ip;
landing_pad = 0;
action_record = 0;
handler_switch_value = 0;
#ifdef SJLJ_EXCEPTIONS
/* The given "IP" is an index into the call-site table, with two
exceptions -- -1 means no-action, and 0 means terminate. But
since we're using uleb128 values, we've not got random access
to the array. */
if ((int) ip < 0)
return _URC_CONTINUE_UNWIND;
else
{
_Unwind_Word cs_lp, cs_action;
do
{
p = read_uleb128 (p, &cs_lp);
p = read_uleb128 (p, &cs_action);
}
while (--ip);
/* Can never have null landing pad for sjlj -- that would have
been indicated by a -1 call site index. */
landing_pad = cs_lp + 1;
if (cs_action)
action_record = info.action_table + cs_action - 1;
goto found_something;
}
#else
/* Search the call-site table for the action associated with this IP. */
while (p < info.action_table)
{
_Unwind_Ptr cs_start, cs_len, cs_lp;
_Unwind_Word cs_action;
/* Note that all call-site encodings are "absolute" displacements. */
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);
/* The table is sorted, so if we've passed the ip, stop. */
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 /* SJLJ_EXCEPTIONS */
/* If ip is not present in the table, C++ would call terminate. */
/* ??? As with Java, it's perhaps better to tweek the LSDA to
that no-action is mapped to no-entry. */
return _URC_CONTINUE_UNWIND;
found_something:
saw_cleanup = 0;
saw_handler = 0;
if (landing_pad == 0)
{
/* If ip is present, and has a null landing pad, there are
no cleanups or handlers to be run. */
}
else if (action_record == 0)
{
/* If ip is present, has a non-null landing pad, and a null
action table offset, then there are only cleanups present.
Cleanups use a zero switch value, as set above. */
saw_cleanup = 1;
}
else
{
/* Otherwise we have a catch handler. */
_Unwind_Sword ar_filter, ar_disp;
while (1)
{
p = action_record;
p = read_sleb128 (p, &ar_filter);
read_sleb128 (p, &ar_disp);
if (ar_filter == 0)
{
/* Zero filter values are cleanups. */
saw_cleanup = 1;
}
/* During forced unwinding, we only run cleanups. With a
foreign exception class, we have no class info to match. */
else if ((actions & _UA_FORCE_UNWIND)
|| foreign_exception)
;
else if (ar_filter > 0)
{
/* Positive filter values are handlers. */
Class catch_type = get_ttype_entry (&info, ar_filter);
if (isKindOf (xh->value, catch_type))
{
handler_switch_value = ar_filter;
saw_handler = 1;
break;
}
}
else
{
/* Negative filter values are exception specifications,
which Objective-C does not use. */
abort ();
}
if (ar_disp == 0)
break;
action_record = p + ar_disp;
}
}
if (! saw_handler && ! saw_cleanup)
CONTINUE_UNWINDING;
if (actions & _UA_SEARCH_PHASE)
{
if (!saw_handler)
CONTINUE_UNWINDING;
/* For domestic exceptions, we cache data from phase 1 for phase 2. */
if (!foreign_exception)
{
#ifdef __ARM_EABI_UNWIDER__
ue_header->barrier_cache.sp = _Unwind_GetGR(context, 13);
ue_header->barrier_cache.bitpattern[1]
= (_uw) handler_switch_value;
ue_header->barrier_cache.bitpattern[3] = (_uw) landing_pad;
#else
xh->handlerSwitchValue = handler_switch_value;
xh->landingPad = landing_pad;
#endif
}
return _URC_HANDLER_FOUND;
}
install_context:
if (saw_cleanup == 0)
{
return_object = xh->value;
if (!(actions & _UA_SEARCH_PHASE))
_Unwind_DeleteException(&xh->base);
}
_Unwind_SetGR (context, __builtin_eh_return_data_regno (0),
__builtin_extend_pointer (saw_cleanup ? xh : return_object));
_Unwind_SetGR (context, __builtin_eh_return_data_regno (1),
handler_switch_value);
_Unwind_SetIP (context, landing_pad);
return _URC_INSTALL_CONTEXT;
}
static inline const unsigned char *
read_encoded_value(struct _Unwind_Context *context, unsigned char encoding,
const unsigned char *p, _Unwind_Ptr *val) {
return read_encoded_value_with_base(encoding,
base_of_encoded_value(encoding, context), p, val);
}
