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// Functions for Exception Support for -*- C++ -*-
// Copyright (C) 1994, 1995, 1996, 1998 Free Software Foundation
// This file is part of GNU CC.
// GNU CC 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.
// GNU CC 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, if you link this library with other files,
// some of which are compiled with GCC, to produce an executable,
// this library 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.
#pragma implementation "exception"
#include "typeinfo"
#include "exception"
/* Define terminate, unexpected, set_terminate, set_unexpected as
well as the default terminate func and default unexpected func. */
extern terminate_handler __terminate_func __attribute__((__noreturn__));
void
terminate ()
{
__terminate_func ();
}
void
__default_unexpected ()
{
terminate ();
}
static unexpected_handler __unexpected_func = __default_unexpected;
terminate_handler
set_terminate (terminate_handler func)
{
terminate_handler old = __terminate_func;
__terminate_func = func;
return old;
}
unexpected_handler
set_unexpected (unexpected_handler func)
{
unexpected_handler old = __unexpected_func;
__unexpected_func = func;
return old;
}
void
unexpected ()
{
__unexpected_func ();
}
/* C++-specific state about the current exception.
This must match init_exception_processing().
Note that handlers and caught are not redundant; when rethrown, an
exception can have multiple active handlers and still be considered
uncaught. */
struct cp_eh_info
{
void *value;
void *type;
void (*cleanup)(void *, int);
bool caught;
cp_eh_info *next;
long handlers;
};
/* Language-specific EH info pointer, defined in libgcc2. */
extern cp_eh_info *__eh_info; // actually void*
/* Is P the type_info node for a pointer of some kind? */
extern bool __is_pointer (void *);
/* Compiler hook to return a pointer to the info for the current exception.
Used by get_eh_info (). */
extern "C" cp_eh_info *
__cp_exception_info (void)
{
return __eh_info;
}
/* Compiler hook to push a new exception onto the stack.
Used by expand_throw(). */
extern "C" void
__cp_push_exception (void *value, void *type, void (*cleanup)(void *, int))
{
cp_eh_info *p = new cp_eh_info;
p->value = value;
p->type = type;
p->cleanup = cleanup;
p->handlers = 0;
p->caught = false;
p->next = __eh_info;
__eh_info = p;
}
/* Compiler hook to pop an exception that has been finalized. Used by
push_eh_cleanup(). P is the info for the exception caught by the
current catch block. */
extern "C" void
__cp_pop_exception (cp_eh_info *p)
{
cp_eh_info **q = &__eh_info;
--p->handlers;
/* Don't really pop if there are still active handlers for our exception,
or if our exception is being rethrown (i.e. if the active exception is
our exception and it is uncaught). */
if (p->handlers != 0
|| (p == *q && !p->caught))
return;
for (; *q; q = &((*q)->next))
if (*q == p)
break;
if (! *q)
terminate ();
*q = p->next;
if (p->cleanup)
/* 3 is a magic value for destructors; see build_delete(). */
p->cleanup (p->value, 3);
else if (__is_pointer (p->type))
/* do nothing; pointers are passed directly in p->value. */;
else
delete p->value;
delete p;
}
extern "C" void
__uncatch_exception (void)
{
cp_eh_info *p = __cp_exception_info ();
if (p)
p->caught = false;
/* otherwise __throw will call terminate(); don't crash here. */
}
extern "C" void
__throw_bad_cast (void)
{
throw bad_cast ();
}
extern "C" void
__throw_bad_typeid (void)
{
throw bad_typeid ();
}
/* Has the current exception been caught? */
bool
uncaught_exception ()
{
cp_eh_info *p = __cp_exception_info ();
return p && ! p->caught;
}
const char * exception::
what () const
{
return typeid (*this).name ();
}
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