0,0 → 1,803 |
// -*- C++ -*- The GNU C++ exception personality routine. |
// Copyright (C) 2001-2015 Free Software Foundation, Inc. |
// |
// This file is part of GCC. |
// |
// GCC is free software; you can redistribute it and/or modify |
// it under the terms of the GNU General Public License as published by |
// the Free Software Foundation; either version 3, or (at your option) |
// any later version. |
// |
// GCC is distributed in the hope that it will be useful, |
// but WITHOUT ANY WARRANTY; without even the implied warranty of |
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
// GNU General Public License for more details. |
// |
// Under Section 7 of GPL version 3, you are granted additional |
// permissions described in the GCC Runtime Library Exception, version |
// 3.1, as published by the Free Software Foundation. |
|
// You should have received a copy of the GNU General Public License and |
// a copy of the GCC Runtime Library Exception along with this program; |
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
// <http://www.gnu.org/licenses/>. |
|
#include <bits/c++config.h> |
#include <cstdlib> |
#include <bits/exception_defines.h> |
#include <cxxabi.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) |
{ |
_uleb128_t tmp; |
unsigned char lpstart_encoding; |
|
info->Start = (context ? _Unwind_GetRegionStart (context) : 0); |
|
// Find @LPStart, the base to which landing pad offsets are relative. |
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; |
|
// Find @TType, the base of the handler and exception spec type data. |
info->ttype_encoding = *p++; |
if (info->ttype_encoding != DW_EH_PE_omit) |
{ |
#if _GLIBCXX_OVERRIDE_TTYPE_ENCODING |
/* Older ARM EABI toolchains set this value incorrectly, so use a |
hardcoded OS-specific format. */ |
info->ttype_encoding = _GLIBCXX_OVERRIDE_TTYPE_ENCODING; |
#endif |
p = read_uleb128 (p, &tmp); |
info->TType = p + tmp; |
} |
else |
info->TType = 0; |
|
// The encoding and length of the call-site table; the action table |
// immediately follows. |
info->call_site_encoding = *p++; |
p = read_uleb128 (p, &tmp); |
info->action_table = p + tmp; |
|
return p; |
} |
|
// Return an element from a type table. |
|
static const std::type_info * |
get_ttype_entry (lsda_header_info *info, _uleb128_t 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); |
} |
|
#ifdef __ARM_EABI_UNWINDER__ |
|
// The ABI provides a routine for matching exception object types. |
typedef _Unwind_Control_Block _throw_typet; |
#define get_adjusted_ptr(catch_type, throw_type, thrown_ptr_p) \ |
(__cxa_type_match (throw_type, catch_type, false, thrown_ptr_p) \ |
!= ctm_failed) |
|
// Return true if THROW_TYPE matches one if the filter types. |
|
static bool |
check_exception_spec(lsda_header_info* info, _throw_typet* throw_type, |
void* thrown_ptr, _sleb128_t filter_value) |
{ |
const _uleb128_t* e = ((const _uleb128_t*) info->TType) |
- filter_value - 1; |
|
while (1) |
{ |
const std::type_info* catch_type; |
_uleb128_t tmp; |
|
tmp = *e; |
|
// Zero signals the end of the list. If we've not found |
// a match by now, then we've failed the specification. |
if (tmp == 0) |
return false; |
|
tmp = _Unwind_decode_typeinfo_ptr(info->ttype_base, (_Unwind_Word) e); |
|
// Match a ttype entry. |
catch_type = reinterpret_cast<const std::type_info*>(tmp); |
|
// ??? There is currently no way to ask the RTTI code about the |
// relationship between two types without reference to a specific |
// object. There should be; then we wouldn't need to mess with |
// thrown_ptr here. |
if (get_adjusted_ptr(catch_type, throw_type, &thrown_ptr)) |
return true; |
|
// Advance to the next entry. |
e++; |
} |
} |
|
|
// Save stage1 handler information in the exception object |
|
static inline void |
save_caught_exception(struct _Unwind_Exception* ue_header, |
struct _Unwind_Context* context, |
void* thrown_ptr, |
int handler_switch_value, |
const unsigned char* language_specific_data, |
_Unwind_Ptr landing_pad, |
const unsigned char* action_record |
__attribute__((__unused__))) |
{ |
ue_header->barrier_cache.sp = _Unwind_GetGR(context, UNWIND_STACK_REG); |
ue_header->barrier_cache.bitpattern[0] = (_uw) thrown_ptr; |
ue_header->barrier_cache.bitpattern[1] |
= (_uw) handler_switch_value; |
ue_header->barrier_cache.bitpattern[2] |
= (_uw) language_specific_data; |
ue_header->barrier_cache.bitpattern[3] = (_uw) landing_pad; |
} |
|
|
// Restore the catch handler data saved during phase1. |
|
static inline void |
restore_caught_exception(struct _Unwind_Exception* ue_header, |
int& handler_switch_value, |
const unsigned char*& language_specific_data, |
_Unwind_Ptr& landing_pad) |
{ |
handler_switch_value = (int) ue_header->barrier_cache.bitpattern[1]; |
language_specific_data = |
(const unsigned char*) ue_header->barrier_cache.bitpattern[2]; |
landing_pad = (_Unwind_Ptr) ue_header->barrier_cache.bitpattern[3]; |
} |
|
#define CONTINUE_UNWINDING \ |
do \ |
{ \ |
if (__gnu_unwind_frame(ue_header, context) != _URC_OK) \ |
return _URC_FAILURE; \ |
return _URC_CONTINUE_UNWIND; \ |
} \ |
while (0) |
|
// Return true if the filter spec is empty, ie throw(). |
|
static bool |
empty_exception_spec (lsda_header_info *info, _Unwind_Sword filter_value) |
{ |
const _Unwind_Word* e = ((const _Unwind_Word*) info->TType) |
- filter_value - 1; |
|
return *e == 0; |
} |
|
#else |
typedef const std::type_info _throw_typet; |
|
|
// Given the thrown type THROW_TYPE, pointer to a variable containing a |
// pointer to the exception object THROWN_PTR_P and a type CATCH_TYPE to |
// compare against, return whether or not there is a match and if so, |
// update *THROWN_PTR_P. |
|
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; |
|
// Pointer types need to adjust the actual pointer, not |
// the pointer to pointer that is the exception object. |
// This also has the effect of passing pointer types |
// "by value" through the __cxa_begin_catch return value. |
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; |
} |
|
// Return true if THROW_TYPE matches one if the filter types. |
|
static bool |
check_exception_spec(lsda_header_info* info, _throw_typet* throw_type, |
void* thrown_ptr, _sleb128_t filter_value) |
{ |
const unsigned char *e = info->TType - filter_value - 1; |
|
while (1) |
{ |
const std::type_info *catch_type; |
_uleb128_t tmp; |
|
e = read_uleb128 (e, &tmp); |
|
// Zero signals the end of the list. If we've not found |
// a match by now, then we've failed the specification. |
if (tmp == 0) |
return false; |
|
// Match a ttype entry. |
catch_type = get_ttype_entry (info, tmp); |
|
// ??? There is currently no way to ask the RTTI code about the |
// relationship between two types without reference to a specific |
// object. There should be; then we wouldn't need to mess with |
// thrown_ptr here. |
if (get_adjusted_ptr (catch_type, throw_type, &thrown_ptr)) |
return true; |
} |
} |
|
|
// Save stage1 handler information in the exception object |
|
static inline void |
save_caught_exception(struct _Unwind_Exception* ue_header, |
struct _Unwind_Context* context |
__attribute__((__unused__)), |
void* thrown_ptr, |
int handler_switch_value, |
const unsigned char* language_specific_data, |
_Unwind_Ptr landing_pad __attribute__((__unused__)), |
const unsigned char* action_record) |
{ |
__cxa_exception* xh = __get_exception_header_from_ue(ue_header); |
|
xh->handlerSwitchValue = handler_switch_value; |
xh->actionRecord = action_record; |
xh->languageSpecificData = language_specific_data; |
xh->adjustedPtr = thrown_ptr; |
|
// ??? Completely unknown what this field is supposed to be for. |
// ??? Need to cache TType encoding base for call_unexpected. |
xh->catchTemp = landing_pad; |
} |
|
|
// Restore the catch handler information saved during phase1. |
|
static inline void |
restore_caught_exception(struct _Unwind_Exception* ue_header, |
int& handler_switch_value, |
const unsigned char*& language_specific_data, |
_Unwind_Ptr& landing_pad) |
{ |
__cxa_exception* xh = __get_exception_header_from_ue(ue_header); |
handler_switch_value = xh->handlerSwitchValue; |
language_specific_data = xh->languageSpecificData; |
landing_pad = (_Unwind_Ptr) xh->catchTemp; |
} |
|
#define CONTINUE_UNWINDING return _URC_CONTINUE_UNWIND |
|
// Return true if the filter spec is empty, ie throw(). |
|
static bool |
empty_exception_spec (lsda_header_info *info, _Unwind_Sword filter_value) |
{ |
const unsigned char *e = info->TType - filter_value - 1; |
_uleb128_t tmp; |
|
e = read_uleb128 (e, &tmp); |
return tmp == 0; |
} |
|
#endif // !__ARM_EABI_UNWINDER__ |
|
namespace __cxxabiv1 |
{ |
|
// Using a different personality function name causes link failures |
// when trying to mix code using different exception handling models. |
#ifdef _GLIBCXX_SJLJ_EXCEPTIONS |
#define PERSONALITY_FUNCTION __gxx_personality_sj0 |
#define __builtin_eh_return_data_regno(x) x |
#elif defined(__SEH__) && !defined (_GLIBCXX_SJLJ_EXCEPTIONS) |
#define PERSONALITY_FUNCTION __gxx_personality_imp |
#else |
#define PERSONALITY_FUNCTION __gxx_personality_v0 |
#endif |
|
#if defined (__SEH__) && !defined (_GLIBCXX_SJLJ_EXCEPTIONS) |
static |
#else |
extern "C" |
#endif |
_Unwind_Reason_Code |
#ifdef __ARM_EABI_UNWINDER__ |
PERSONALITY_FUNCTION (_Unwind_State state, |
struct _Unwind_Exception* ue_header, |
struct _Unwind_Context* context) |
#else |
PERSONALITY_FUNCTION (int version, |
_Unwind_Action actions, |
_Unwind_Exception_Class exception_class, |
struct _Unwind_Exception *ue_header, |
struct _Unwind_Context *context) |
#endif |
{ |
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 = 0; |
bool foreign_exception; |
int ip_before_insn = 0; |
|
#ifdef __ARM_EABI_UNWINDER__ |
_Unwind_Action actions; |
|
switch (state & _US_ACTION_MASK) |
{ |
case _US_VIRTUAL_UNWIND_FRAME: |
// If the unwind state pattern is |
// _US_VIRTUAL_UNWIND_FRAME | _US_FORCE_UNWIND |
// then we don't need to search for any handler as it is not a real |
// exception. Just unwind the stack. |
if (state & _US_FORCE_UNWIND) |
CONTINUE_UNWINDING; |
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, |
UNWIND_STACK_REG)) |
actions |= _UA_HANDLER_FRAME; |
break; |
|
case _US_UNWIND_FRAME_RESUME: |
CONTINUE_UNWINDING; |
break; |
|
default: |
std::abort(); |
} |
actions |= state & _US_FORCE_UNWIND; |
|
// We don't know which runtime we're working with, so can't check this. |
// However the ABI routines hide this from us, and we don't actually need |
// to know. |
foreign_exception = false; |
|
// The dwarf unwinder assumes the context structure holds things like the |
// function and LSDA pointers. The ARM implementation caches these in |
// the exception header (UCB). To avoid rewriting everything we make a |
// virtual scratch register point at the UCB. |
ip = (_Unwind_Ptr) ue_header; |
_Unwind_SetGR(context, UNWIND_POINTER_REG, ip); |
#else |
__cxa_exception* xh = __get_exception_header_from_ue(ue_header); |
|
// Interface version check. |
if (version != 1) |
return _URC_FATAL_PHASE1_ERROR; |
foreign_exception = !__is_gxx_exception_class(exception_class); |
#endif |
|
// 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) |
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 _GLIBCXX_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 _GLIBCXX_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 if (ip == 0) |
{ |
// Fall through to set found_terminate. |
} |
else |
{ |
_uleb128_t 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; |
_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; |
} |
} |
#endif // _GLIBCXX_SJLJ_EXCEPTIONS |
|
// 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; |
|
#ifdef __ARM_EABI_UNWINDER__ |
// ??? How does this work - more importantly, how does it interact with |
// dependent exceptions? |
throw_type = ue_header; |
if (actions & _UA_FORCE_UNWIND) |
{ |
__GXX_INIT_FORCED_UNWIND_CLASS(ue_header->exception_class); |
} |
else if (!foreign_exception) |
thrown_ptr = __get_object_from_ue (ue_header); |
#else |
#if __cpp_rtti |
// During forced unwinding, match a magic exception type. |
if (actions & _UA_FORCE_UNWIND) |
{ |
throw_type = &typeid(abi::__forced_unwind); |
} |
// With a foreign exception class, there's no exception type. |
// ??? What to do about GNU Java and GNU Ada exceptions? |
else if (foreign_exception) |
{ |
throw_type = &typeid(abi::__foreign_exception); |
} |
else |
#endif |
{ |
thrown_ptr = __get_object_from_ue (ue_header); |
throw_type = __get_exception_header_from_obj |
(thrown_ptr)->exceptionType; |
} |
#endif |
|
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); |
|
// 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 |
{ |
// 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) |
CONTINUE_UNWINDING; |
|
if (actions & _UA_SEARCH_PHASE) |
{ |
if (found_type == found_cleanup) |
CONTINUE_UNWINDING; |
|
// For domestic exceptions, we cache data from phase 1 for phase 2. |
if (!foreign_exception) |
{ |
save_caught_exception(ue_header, context, thrown_ptr, |
handler_switch_value, language_specific_data, |
landing_pad, action_record); |
} |
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) |
std::terminate (); |
else if (handler_switch_value < 0) |
{ |
__try |
{ std::unexpected (); } |
__catch(...) |
{ std::terminate (); } |
} |
} |
else |
{ |
if (found_type == found_terminate) |
__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); |
|
#ifdef __ARM_EABI_UNWINDER__ |
const _Unwind_Word* e; |
_Unwind_Word n; |
|
e = ((const _Unwind_Word*) info.TType) - handler_switch_value - 1; |
// Count the number of rtti objects. |
n = 0; |
while (e[n] != 0) |
n++; |
|
// Count. |
ue_header->barrier_cache.bitpattern[1] = n; |
// Base |
ue_header->barrier_cache.bitpattern[2] = info.ttype_base; |
// Stride. |
ue_header->barrier_cache.bitpattern[3] = 4; |
// List head. |
ue_header->barrier_cache.bitpattern[4] = (_Unwind_Word) e; |
#else |
xh->catchTemp = base_of_encoded_value (info.ttype_encoding, context); |
#endif |
} |
} |
|
/* 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); |
#ifdef __ARM_EABI_UNWINDER__ |
if (found_type == found_cleanup) |
__cxa_begin_cleanup(ue_header); |
#endif |
return _URC_INSTALL_CONTEXT; |
} |
|
/* The ARM EABI implementation of __cxa_call_unexpected is in a |
different file so that the personality routine (PR) can be used |
standalone. The generic routine shared datastructures with the PR |
so it is most convenient to implement it here. */ |
#ifndef __ARM_EABI_UNWINDER__ |
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); |
|
// This function is a handler for our exception argument. If we exit |
// by throwing a different exception, we'll need the original cleaned up. |
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; |
|
// If the unexpectedHandler rethrows the exception (e.g. to categorize it), |
// it will clobber data about the current handler. So copy the data out now. |
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(...) |
{ |
// Get the exception thrown from unexpected. |
|
__cxa_eh_globals *globals = __cxa_get_globals_fast (); |
__cxa_exception *new_xh = globals->caughtExceptions; |
void *new_ptr = __get_object_from_ambiguous_exception (new_xh); |
|
// We don't quite have enough stuff cached; re-parse the LSDA. |
parse_lsda_header (0, xh_lsda, &info); |
|
// If this new exception meets the exception spec, allow it. |
if (check_exception_spec (&info, __get_exception_header_from_obj |
(new_ptr)->exceptionType, |
new_ptr, xh_switch_value)) |
{ __throw_exception_again; } |
|
// If the exception spec allows std::bad_exception, throw that. |
// We don't have a thrown object to compare against, but since |
// bad_exception doesn't have virtual bases, that's OK; just pass 0. |
#if __cpp_exceptions && __cpp_rtti |
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 |
|
// Otherwise, die. |
__terminate (xh_terminate_handler); |
} |
} |
#endif |
|
#if defined (__SEH__) && !defined (_GLIBCXX_SJLJ_EXCEPTIONS) |
extern "C" |
EXCEPTION_DISPOSITION |
__gxx_personality_seh0 (PEXCEPTION_RECORD ms_exc, void *this_frame, |
PCONTEXT ms_orig_context, PDISPATCHER_CONTEXT ms_disp) |
{ |
return _GCC_specific_handler (ms_exc, this_frame, ms_orig_context, |
ms_disp, __gxx_personality_imp); |
} |
#endif /* SEH */ |
|
} // namespace __cxxabiv1 |