mirror of
https://gcc.gnu.org/git/gcc.git
synced 2024-12-05 09:44:10 +08:00
a1c88e064f
2006-01-25 Benjamin Kosnik <bkoz@redhat.com> * docs/html/configopts.html: Tweak docs. * libsupc++/eh_personality.cc: Fix typos. From-SVN: r110218
748 lines
22 KiB
C++
748 lines
22 KiB
C++
// -*- C++ -*- The GNU C++ exception personality routine.
|
||
// Copyright (C) 2001, 2002, 2003, 2006 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 2, 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.
|
||
//
|
||
// You should have received a copy of the GNU General Public License
|
||
// along with GCC; see the file COPYING. If not, write to
|
||
// the Free Software Foundation, 51 Franklin Street, Fifth Floor,
|
||
// Boston, MA 02110-1301, USA.
|
||
|
||
// As a special exception, you may use this file as part of a free software
|
||
// library without restriction. Specifically, if other files instantiate
|
||
// templates or use macros or inline functions from this file, or you compile
|
||
// this file and link it with other files to produce an executable, this
|
||
// file does not by itself cause the resulting executable to be covered by
|
||
// the GNU General Public License. This exception does not however
|
||
// invalidate any other reasons why the executable file might be covered by
|
||
// the GNU General Public License.
|
||
|
||
#include <bits/c++config.h>
|
||
#include <cstdlib>
|
||
#include <exception_defines.h>
|
||
#include "unwind-cxx.h"
|
||
|
||
using namespace __cxxabiv1;
|
||
|
||
#ifdef __ARM_EABI_UNWINDER__
|
||
#define NO_SIZE_OF_ENCODED_VALUE
|
||
#endif
|
||
|
||
#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);
|
||
|
||
// 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)
|
||
{
|
||
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;
|
||
}
|
||
|
||
#ifdef __ARM_EABI_UNWINDER__
|
||
|
||
// Return an element from a type table.
|
||
|
||
static const std::type_info*
|
||
get_ttype_entry(lsda_header_info* info, _Unwind_Word i)
|
||
{
|
||
_Unwind_Ptr ptr;
|
||
|
||
ptr = (_Unwind_Ptr) (info->TType - (i * 4));
|
||
ptr = _Unwind_decode_target2(ptr);
|
||
|
||
return reinterpret_cast<const std::type_info *>(ptr);
|
||
}
|
||
|
||
// 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, _Unwind_Sword filter_value)
|
||
{
|
||
const _Unwind_Word* e = ((const _Unwind_Word*) info->TType)
|
||
- filter_value - 1;
|
||
|
||
while (1)
|
||
{
|
||
const std::type_info* catch_type;
|
||
_Unwind_Word 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_target2((_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, 13);
|
||
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)
|
||
|
||
#else
|
||
typedef const std::type_info _throw_typet;
|
||
|
||
|
||
// Return an element from a type table.
|
||
|
||
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);
|
||
}
|
||
|
||
// 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, _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);
|
||
|
||
// 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
|
||
|
||
#endif // !__ARM_EABI_UNWINDER__
|
||
|
||
// 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;
|
||
_Unwind_Word tmp;
|
||
|
||
e = read_uleb128 (e, &tmp);
|
||
return tmp == 0;
|
||
}
|
||
|
||
// 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
|
||
#else
|
||
#define PERSONALITY_FUNCTION __gxx_personality_v0
|
||
#endif
|
||
|
||
extern "C" _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 = ue_header + 1;
|
||
bool foreign_exception;
|
||
|
||
#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:
|
||
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 the
|
||
// virtual IP register point at the UCB.
|
||
ip = (_Unwind_Ptr) ue_header;
|
||
_Unwind_SetGR(context, 12, 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);
|
||
ip = _Unwind_GetIP (context) - 1;
|
||
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
|
||
{
|
||
_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 // _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.
|
||
|
||
_Unwind_Sword ar_filter, ar_disp;
|
||
const std::type_info* catch_type;
|
||
_throw_typet* throw_type;
|
||
bool saw_cleanup = false;
|
||
bool saw_handler = false;
|
||
|
||
// During forced unwinding, we only run cleanups. With a foreign
|
||
// exception class, there's no exception type.
|
||
// ??? What to do about GNU Java and GNU Ada exceptions.
|
||
|
||
if ((actions & _UA_FORCE_UNWIND)
|
||
|| foreign_exception)
|
||
throw_type = 0;
|
||
else
|
||
#ifdef __ARM_EABI_UNWINDER__
|
||
throw_type = ue_header;
|
||
#else
|
||
throw_type = xh->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
|
||
? ! 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);
|
||
|
||
#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 (obsolete)
|
||
ue_header->barrier_cache.bitpattern[2] = 0;
|
||
// 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 = new_xh + 1;
|
||
|
||
// 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, new_xh->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.
|
||
#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
|
||
|
||
// Otherwise, die.
|
||
__terminate (xh_terminate_handler);
|
||
}
|
||
}
|
||
#endif
|