// -*- C++ -*- The GNU C++ exception personality routine.
-// Copyright (C) 2001, 2002 Free Software Foundation, Inc.
+// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
+// Free Software Foundation, Inc.
//
-// This file is part of GNU CC.
+// This file is part of GCC.
//
-// GNU CC is free software; you can redistribute it and/or modify
+// 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)
+// the Free Software Foundation; either version 3, or (at your option)
// any later version.
//
-// GNU CC is distributed in the hope that it will be useful,
+// 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 GNU CC; see the file COPYING. If not, write to
-// the Free Software Foundation, 59 Temple Place - Suite 330,
-// Boston, MA 02111-1307, 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.
+// 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 <exception_defines.h>
+#include <cxxabi.h>
#include "unwind-cxx.h"
using namespace __cxxabiv1;
+#ifdef __ARM_EABI_UNWINDER__
+#define NO_SIZE_OF_ENCODED_VALUE
+#endif
+
#include "unwind-pe.h"
\f
parse_lsda_header (_Unwind_Context *context, const unsigned char *p,
lsda_header_info *info)
{
- _Unwind_Word tmp;
+ _uleb128_t tmp;
unsigned char lpstart_encoding;
info->Start = (context ? _Unwind_GetRegionStart (context) : 0);
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, _uleb128_t 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, _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_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)
+
+// 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;
+
+
+// Return an element from a type table.
+
static const std::type_info *
-get_ttype_entry (lsda_header_info *info, _Unwind_Word i)
+get_ttype_entry (lsda_header_info *info, _uleb128_t i)
{
_Unwind_Ptr ptr;
return false;
}
+// Return true if THROW_TYPE matches one if the filter types.
+
static bool
-check_exception_spec (lsda_header_info *info, const std::type_info *throw_type,
- void *thrown_ptr, _Unwind_Sword filter_value)
+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;
- _Unwind_Word tmp;
+ _uleb128_t tmp;
e = read_uleb128 (e, &tmp);
}
}
+
+// 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 _GLIBCPP_SJLJ_EXCEPTIONS
+#ifdef _GLIBCXX_SJLJ_EXCEPTIONS
#define PERSONALITY_FUNCTION __gxx_personality_sj0
#define __builtin_eh_return_data_regno(x) x
#else
#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
{
- __cxa_exception *xh = __get_exception_header_from_ue (ue_header);
-
enum found_handler_type
{
found_nothing,
const unsigned char *p;
_Unwind_Ptr landing_pad, ip;
int handler_switch_value;
- void *thrown_ptr = xh + 1;
+ 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:
+ 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)
- && exception_class == __gxx_exception_class)
+ && !foreign_exception)
{
- handler_switch_value = xh->handlerSwitchValue;
- landing_pad = (_Unwind_Ptr) xh->catchTemp;
+ 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;
}
// If no LSDA, then there are no handlers or cleanups.
if (! language_specific_data)
- return _URC_CONTINUE_UNWIND;
+ 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;
+#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 _GLIBCPP_SJLJ_EXCEPTIONS
+#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
}
else
{
- _Unwind_Word cs_lp, cs_action;
+ _uleb128_t cs_lp, cs_action;
do
{
p = read_uleb128 (p, &cs_lp);
while (p < info.action_table)
{
_Unwind_Ptr cs_start, cs_len, cs_lp;
- _Unwind_Word cs_action;
+ _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);
goto found_something;
}
}
-#endif // _GLIBCPP_SJLJ_EXCEPTIONS
+#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 = (actions & _UA_FORCE_UNWIND ? found_nothing : found_terminate);
+ found_type = found_terminate;
goto do_something;
found_something:
{
// Otherwise we have a catch handler or exception specification.
- _Unwind_Sword ar_filter, ar_disp;
- const std::type_info *throw_type, *catch_type;
+ _sleb128_t 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)
- || exception_class != __gxx_exception_class)
- throw_type = 0;
+#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
+ // 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
- throw_type = xh->exceptionType;
+ {
+ thrown_ptr = __get_object_from_ue (ue_header);
+ throw_type = __get_exception_header_from_obj
+ (thrown_ptr)->exceptionType;
+ }
+#endif
while (1)
{
// 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.
- if (! catch_type)
- {
- if (!(actions & _UA_FORCE_UNWIND))
- {
- saw_handler = true;
- break;
- }
- }
- else if (throw_type)
+ // 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)))
{
- if (get_adjusted_ptr (catch_type, throw_type, &thrown_ptr))
- {
- saw_handler = true;
- break;
- }
+ saw_handler = true;
+ break;
}
}
else
// ??? 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.
- if (throw_type
- && ! check_exception_spec (&info, throw_type, thrown_ptr,
- ar_filter))
+ // 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;
do_something:
if (found_type == found_nothing)
- return _URC_CONTINUE_UNWIND;
+ CONTINUE_UNWINDING;
if (actions & _UA_SEARCH_PHASE)
{
if (found_type == found_cleanup)
- return _URC_CONTINUE_UNWIND;
+ CONTINUE_UNWINDING;
// For domestic exceptions, we cache data from phase 1 for phase 2.
- if (exception_class == __gxx_exception_class)
+ if (!foreign_exception)
{
- 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 = (void *) (_Unwind_Ptr) landing_pad;
+ save_caught_exception(ue_header, context, thrown_ptr,
+ handler_switch_value, language_specific_data,
+ landing_pad, action_record);
}
return _URC_HANDLER_FOUND;
}
install_context:
- if (found_type == found_terminate)
+
+ // 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)
{
- __cxa_begin_catch (&xh->unwindHeader);
- __terminate (xh->terminateHandler);
+ if (found_type == found_terminate)
+ std::terminate ();
+ else if (handler_switch_value < 0)
+ {
+ __try
+ { std::unexpected (); }
+ __catch(...)
+ { std::terminate (); }
+ }
}
-
- // Cache the TType base value for __cxa_call_unexpected, as we won't
- // have an _Unwind_Context then.
- if (handler_switch_value < 0)
+ else
{
- parse_lsda_header (context, xh->languageSpecificData, &info);
- xh->catchTemp = (void *) base_of_encoded_value (info.ttype_encoding,
- context);
+ 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),
- (_Unwind_Ptr) &xh->unwindHeader);
+ __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)
{
xh_terminate_handler = xh->terminateHandler;
info.ttype_base = (_Unwind_Ptr) xh->catchTemp;
- try
+ __try
{ __unexpected (xh->unexpectedHandler); }
- catch(...)
+ __catch(...)
{
// Get the exception thrown from unexpected.
- // ??? Foreign exceptions can't be stacked this way.
-
+
__cxa_eh_globals *globals = __cxa_get_globals_fast ();
__cxa_exception *new_xh = globals->caughtExceptions;
- void *new_ptr = new_xh + 1;
-
+ 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, new_xh->exceptionType,
+ 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 (check_exception_spec (&info, &bad_exc, 0, xh_switch_value))
throw std::bad_exception();
#endif
+
// Otherwise, die.
__terminate (xh_terminate_handler);
}
}
+#endif
+
+} // namespace __cxxabiv1
projects / msp430-gcc.git / blobdiff