813 lines
24 KiB
C++
813 lines
24 KiB
C++
// -*- C++ -*- The GNU C++ exception personality routine.
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// Copyright (C) 2001-2021 Free Software Foundation, Inc.
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//
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// This file is part of GCC.
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//
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// GCC is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3, or (at your option)
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// any later version.
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//
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// GCC is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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#include <bits/c++config.h>
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#include <cstdlib>
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#include <bits/exception_defines.h>
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#include <cxxabi.h>
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#include "unwind-cxx.h"
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using namespace __cxxabiv1;
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#include "unwind-pe.h"
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struct lsda_header_info
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{
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_Unwind_Ptr Start;
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_Unwind_Ptr LPStart;
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_Unwind_Ptr ttype_base;
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const unsigned char *TType;
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const unsigned char *action_table;
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unsigned char ttype_encoding;
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unsigned char call_site_encoding;
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};
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static const unsigned char *
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parse_lsda_header (_Unwind_Context *context, const unsigned char *p,
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lsda_header_info *info)
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{
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_uleb128_t tmp;
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unsigned char lpstart_encoding;
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info->Start = (context ? _Unwind_GetRegionStart (context) : 0);
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// Find @LPStart, the base to which landing pad offsets are relative.
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lpstart_encoding = *p++;
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if (lpstart_encoding != DW_EH_PE_omit)
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p = read_encoded_value (context, lpstart_encoding, p, &info->LPStart);
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else
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info->LPStart = info->Start;
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// Find @TType, the base of the handler and exception spec type data.
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info->ttype_encoding = *p++;
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if (info->ttype_encoding != DW_EH_PE_omit)
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{
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#if _GLIBCXX_OVERRIDE_TTYPE_ENCODING
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/* Older ARM EABI toolchains set this value incorrectly, so use a
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hardcoded OS-specific format. */
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info->ttype_encoding = _GLIBCXX_OVERRIDE_TTYPE_ENCODING;
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#endif
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p = read_uleb128 (p, &tmp);
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info->TType = p + tmp;
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}
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else
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info->TType = 0;
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// The encoding and length of the call-site table; the action table
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// immediately follows.
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info->call_site_encoding = *p++;
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p = read_uleb128 (p, &tmp);
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info->action_table = p + tmp;
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return p;
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}
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// Return an element from a type table.
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static const std::type_info *
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get_ttype_entry (lsda_header_info *info, _uleb128_t i)
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{
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_Unwind_Ptr ptr;
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i *= size_of_encoded_value (info->ttype_encoding);
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read_encoded_value_with_base (
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#if __FDPIC__
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/* Force these flags to nake sure to
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take the GOT into account. */
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(DW_EH_PE_pcrel | DW_EH_PE_indirect),
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#else
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info->ttype_encoding,
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#endif
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info->ttype_base,
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info->TType - i, &ptr);
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return reinterpret_cast<const std::type_info *>(ptr);
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}
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#ifdef __ARM_EABI_UNWINDER__
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// The ABI provides a routine for matching exception object types.
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typedef _Unwind_Control_Block _throw_typet;
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#define get_adjusted_ptr(catch_type, throw_type, thrown_ptr_p) \
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(__cxa_type_match (throw_type, catch_type, false, thrown_ptr_p) \
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!= ctm_failed)
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// Return true if THROW_TYPE matches one if the filter types.
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static bool
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check_exception_spec(lsda_header_info* info, _throw_typet* throw_type,
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void* thrown_ptr, _sleb128_t filter_value)
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{
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const _uleb128_t* e = ((const _uleb128_t*) info->TType)
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- filter_value - 1;
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while (1)
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{
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const std::type_info* catch_type;
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_uleb128_t tmp;
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tmp = *e;
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// Zero signals the end of the list. If we've not found
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// a match by now, then we've failed the specification.
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if (tmp == 0)
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return false;
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tmp = _Unwind_decode_typeinfo_ptr(info->ttype_base, (_Unwind_Word) e);
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// Match a ttype entry.
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catch_type = reinterpret_cast<const std::type_info*>(tmp);
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// ??? There is currently no way to ask the RTTI code about the
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// relationship between two types without reference to a specific
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// object. There should be; then we wouldn't need to mess with
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// thrown_ptr here.
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if (get_adjusted_ptr(catch_type, throw_type, &thrown_ptr))
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return true;
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// Advance to the next entry.
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e++;
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}
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}
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// Save stage1 handler information in the exception object
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static inline void
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save_caught_exception(struct _Unwind_Exception* ue_header,
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struct _Unwind_Context* context,
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void* thrown_ptr,
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int handler_switch_value,
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const unsigned char* language_specific_data,
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_Unwind_Ptr landing_pad,
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const unsigned char* action_record
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__attribute__((__unused__)))
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{
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ue_header->barrier_cache.sp = _Unwind_GetGR(context, UNWIND_STACK_REG);
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ue_header->barrier_cache.bitpattern[0] = (_uw) thrown_ptr;
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ue_header->barrier_cache.bitpattern[1]
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= (_uw) handler_switch_value;
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ue_header->barrier_cache.bitpattern[2]
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= (_uw) language_specific_data;
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ue_header->barrier_cache.bitpattern[3] = (_uw) landing_pad;
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}
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// Restore the catch handler data saved during phase1.
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static inline void
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restore_caught_exception(struct _Unwind_Exception* ue_header,
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int& handler_switch_value,
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const unsigned char*& language_specific_data,
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_Unwind_Ptr& landing_pad)
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{
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handler_switch_value = (int) ue_header->barrier_cache.bitpattern[1];
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language_specific_data =
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(const unsigned char*) ue_header->barrier_cache.bitpattern[2];
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landing_pad = (_Unwind_Ptr) ue_header->barrier_cache.bitpattern[3];
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}
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#define CONTINUE_UNWINDING \
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do \
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{ \
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if (__gnu_unwind_frame(ue_header, context) != _URC_OK) \
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return _URC_FAILURE; \
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return _URC_CONTINUE_UNWIND; \
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} \
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while (0)
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// Return true if the filter spec is empty, ie throw().
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static bool
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empty_exception_spec (lsda_header_info *info, _Unwind_Sword filter_value)
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{
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const _Unwind_Word* e = ((const _Unwind_Word*) info->TType)
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- filter_value - 1;
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return *e == 0;
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}
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#else
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typedef const std::type_info _throw_typet;
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// Given the thrown type THROW_TYPE, pointer to a variable containing a
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// pointer to the exception object THROWN_PTR_P and a type CATCH_TYPE to
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// compare against, return whether or not there is a match and if so,
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// update *THROWN_PTR_P.
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static bool
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get_adjusted_ptr (const std::type_info *catch_type,
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const std::type_info *throw_type,
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void **thrown_ptr_p)
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{
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void *thrown_ptr = *thrown_ptr_p;
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// Pointer types need to adjust the actual pointer, not
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// the pointer to pointer that is the exception object.
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// This also has the effect of passing pointer types
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// "by value" through the __cxa_begin_catch return value.
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if (throw_type->__is_pointer_p ())
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thrown_ptr = *(void **) thrown_ptr;
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if (catch_type->__do_catch (throw_type, &thrown_ptr, 1))
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{
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*thrown_ptr_p = thrown_ptr;
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return true;
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}
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return false;
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}
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// Return true if THROW_TYPE matches one if the filter types.
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static bool
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check_exception_spec(lsda_header_info* info, _throw_typet* throw_type,
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void* thrown_ptr, _sleb128_t filter_value)
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{
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const unsigned char *e = info->TType - filter_value - 1;
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while (1)
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{
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const std::type_info *catch_type;
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_uleb128_t tmp;
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e = read_uleb128 (e, &tmp);
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// Zero signals the end of the list. If we've not found
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// a match by now, then we've failed the specification.
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if (tmp == 0)
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return false;
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// Match a ttype entry.
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catch_type = get_ttype_entry (info, tmp);
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// ??? There is currently no way to ask the RTTI code about the
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// relationship between two types without reference to a specific
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// object. There should be; then we wouldn't need to mess with
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// thrown_ptr here.
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if (get_adjusted_ptr (catch_type, throw_type, &thrown_ptr))
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return true;
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}
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}
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// Save stage1 handler information in the exception object
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static inline void
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save_caught_exception(struct _Unwind_Exception* ue_header,
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struct _Unwind_Context* context
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__attribute__((__unused__)),
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void* thrown_ptr,
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int handler_switch_value,
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const unsigned char* language_specific_data,
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_Unwind_Ptr landing_pad __attribute__((__unused__)),
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const unsigned char* action_record)
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{
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__cxa_exception* xh = __get_exception_header_from_ue(ue_header);
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xh->handlerSwitchValue = handler_switch_value;
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xh->actionRecord = action_record;
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xh->languageSpecificData = language_specific_data;
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xh->adjustedPtr = thrown_ptr;
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// ??? Completely unknown what this field is supposed to be for.
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// ??? Need to cache TType encoding base for call_unexpected.
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xh->catchTemp = landing_pad;
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}
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// Restore the catch handler information saved during phase1.
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static inline void
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restore_caught_exception(struct _Unwind_Exception* ue_header,
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int& handler_switch_value,
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const unsigned char*& language_specific_data,
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_Unwind_Ptr& landing_pad)
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{
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__cxa_exception* xh = __get_exception_header_from_ue(ue_header);
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handler_switch_value = xh->handlerSwitchValue;
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language_specific_data = xh->languageSpecificData;
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landing_pad = (_Unwind_Ptr) xh->catchTemp;
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}
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#define CONTINUE_UNWINDING return _URC_CONTINUE_UNWIND
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// Return true if the filter spec is empty, ie throw().
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static bool
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empty_exception_spec (lsda_header_info *info, _Unwind_Sword filter_value)
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{
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const unsigned char *e = info->TType - filter_value - 1;
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_uleb128_t tmp;
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e = read_uleb128 (e, &tmp);
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return tmp == 0;
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}
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#endif // !__ARM_EABI_UNWINDER__
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namespace __cxxabiv1
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{
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// Using a different personality function name causes link failures
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// when trying to mix code using different exception handling models.
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#ifdef __USING_SJLJ_EXCEPTIONS__
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#define PERSONALITY_FUNCTION __gxx_personality_sj0
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#define __builtin_eh_return_data_regno(x) x
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#elif defined(__SEH__)
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#define PERSONALITY_FUNCTION __gxx_personality_imp
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#else
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#define PERSONALITY_FUNCTION __gxx_personality_v0
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#endif
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#if defined (__SEH__) && !defined (__USING_SJLJ_EXCEPTIONS__)
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static
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#else
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extern "C"
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#endif
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_Unwind_Reason_Code
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#ifdef __ARM_EABI_UNWINDER__
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__attribute__((target ("general-regs-only")))
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PERSONALITY_FUNCTION (_Unwind_State state,
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struct _Unwind_Exception* ue_header,
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struct _Unwind_Context* context)
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#else
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PERSONALITY_FUNCTION (int version,
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_Unwind_Action actions,
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_Unwind_Exception_Class exception_class,
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struct _Unwind_Exception *ue_header,
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struct _Unwind_Context *context)
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#endif
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{
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enum found_handler_type
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{
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found_nothing,
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found_terminate,
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found_cleanup,
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found_handler
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} found_type;
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lsda_header_info info;
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const unsigned char *language_specific_data;
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const unsigned char *action_record;
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const unsigned char *p;
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_Unwind_Ptr landing_pad, ip;
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int handler_switch_value;
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void* thrown_ptr = 0;
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bool foreign_exception;
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int ip_before_insn = 0;
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#ifdef __ARM_EABI_UNWINDER__
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_Unwind_Action actions;
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switch (state & _US_ACTION_MASK)
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{
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case _US_VIRTUAL_UNWIND_FRAME:
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// If the unwind state pattern is
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// _US_VIRTUAL_UNWIND_FRAME | _US_FORCE_UNWIND
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// then we don't need to search for any handler as it is not a real
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// exception. Just unwind the stack.
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if (state & _US_FORCE_UNWIND)
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CONTINUE_UNWINDING;
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actions = _UA_SEARCH_PHASE;
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break;
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case _US_UNWIND_FRAME_STARTING:
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actions = _UA_CLEANUP_PHASE;
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if (!(state & _US_FORCE_UNWIND)
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&& ue_header->barrier_cache.sp == _Unwind_GetGR(context,
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UNWIND_STACK_REG))
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actions |= _UA_HANDLER_FRAME;
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break;
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case _US_UNWIND_FRAME_RESUME:
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CONTINUE_UNWINDING;
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break;
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default:
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std::abort();
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}
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actions |= state & _US_FORCE_UNWIND;
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// We don't know which runtime we're working with, so can't check this.
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// However the ABI routines hide this from us, and we don't actually need
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// to know.
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foreign_exception = false;
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// The dwarf unwinder assumes the context structure holds things like the
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// function and LSDA pointers. The ARM implementation caches these in
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// the exception header (UCB). To avoid rewriting everything we make a
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// virtual scratch register point at the UCB.
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ip = (_Unwind_Ptr) ue_header;
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_Unwind_SetGR(context, UNWIND_POINTER_REG, ip);
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#else
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__cxa_exception* xh = __get_exception_header_from_ue(ue_header);
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// Interface version check.
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if (version != 1)
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return _URC_FATAL_PHASE1_ERROR;
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foreign_exception = !__is_gxx_exception_class(exception_class);
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#endif
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// Shortcut for phase 2 found handler for domestic exception.
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if (actions == (_UA_CLEANUP_PHASE | _UA_HANDLER_FRAME)
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&& !foreign_exception)
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{
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restore_caught_exception(ue_header, handler_switch_value,
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language_specific_data, landing_pad);
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found_type = (landing_pad == 0 ? found_terminate : found_handler);
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goto install_context;
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}
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language_specific_data = (const unsigned char *)
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_Unwind_GetLanguageSpecificData (context);
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// If no LSDA, then there are no handlers or cleanups.
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if (! language_specific_data)
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CONTINUE_UNWINDING;
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// Parse the LSDA header.
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p = parse_lsda_header (context, language_specific_data, &info);
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info.ttype_base = base_of_encoded_value (info.ttype_encoding, context);
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#ifdef _GLIBCXX_HAVE_GETIPINFO
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ip = _Unwind_GetIPInfo (context, &ip_before_insn);
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#else
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ip = _Unwind_GetIP (context);
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#endif
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if (! ip_before_insn)
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--ip;
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landing_pad = 0;
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action_record = 0;
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handler_switch_value = 0;
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#ifdef __USING_SJLJ_EXCEPTIONS__
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// The given "IP" is an index into the call-site table, with two
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// exceptions -- -1 means no-action, and 0 means terminate. But
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// since we're using uleb128 values, we've not got random access
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// to the array.
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if ((int) ip < 0)
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return _URC_CONTINUE_UNWIND;
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else if (ip == 0)
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{
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// Fall through to set found_terminate.
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}
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else
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{
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_uleb128_t cs_lp, cs_action;
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do
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{
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p = read_uleb128 (p, &cs_lp);
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p = read_uleb128 (p, &cs_action);
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}
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while (--ip);
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// Can never have null landing pad for sjlj -- that would have
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// been indicated by a -1 call site index.
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landing_pad = cs_lp + 1;
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if (cs_action)
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action_record = info.action_table + cs_action - 1;
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goto found_something;
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}
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#else
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// Search the call-site table for the action associated with this IP.
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while (p < info.action_table)
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{
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_Unwind_Ptr cs_start, cs_len, cs_lp;
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_uleb128_t cs_action;
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// Note that all call-site encodings are "absolute" displacements.
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p = read_encoded_value (0, info.call_site_encoding, p, &cs_start);
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p = read_encoded_value (0, info.call_site_encoding, p, &cs_len);
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p = read_encoded_value (0, info.call_site_encoding, p, &cs_lp);
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p = read_uleb128 (p, &cs_action);
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// The table is sorted, so if we've passed the ip, stop.
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if (ip < info.Start + cs_start)
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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 // __USING_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 (__USING_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
|