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// -*- C++ -*- Allocate exception objects.
// Copyright (C) 2001 Free Software Foundation, Inc.
//
// 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, 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.
// This is derived from the C++ ABI for IA-64. Where we diverge
// for cross-architecture compatibility are noted with "@@@".
#include <exception>
#include <cstdlib>
#include <cstring>
#include <climits>
#include "unwind-cxx.h"
#include "bits/c++config.h"
#include "bits/gthr.h"
using namespace __cxxabiv1;
// ??? How to control these parameters.
// Guess from the size of basic types how large a buffer is reasonable.
// Note that the basic c++ exception header has 13 pointers and 2 ints,
// so on a system with PSImode pointers we're talking about 56 bytes
// just for overhead.
#if INT_MAX == 32767
# define EMERGENCY_OBJ_SIZE 128
# define EMERGENCY_OBJ_COUNT 16
#elif LONG_MAX == 2147483647
# define EMERGENCY_OBJ_SIZE 512
# define EMERGENCY_OBJ_COUNT 32
#else
# define EMERGENCY_OBJ_SIZE 1024
# define EMERGENCY_OBJ_COUNT 64
#endif
#ifndef __GTHREADS
# undef EMERGENCY_OBJ_COUNT
# define EMERGENCY_OBJ_COUNT 4
#endif
#if INT_MAX == 32767 || EMERGENCY_OBJ_COUNT <= 32
typedef unsigned int bitmask_type;
#else
typedef unsigned long bitmask_type;
#endif
typedef char one_buffer[EMERGENCY_OBJ_SIZE] __attribute__((aligned));
static one_buffer emergency_buffer[EMERGENCY_OBJ_COUNT];
static bitmask_type emergency_used;
#ifdef __GTHREADS
#ifdef __GTHREAD_MUTEX_INIT
static __gthread_mutex_t emergency_mutex =__GTHREAD_MUTEX_INIT;
#else
static __gthread_mutex_t emergency_mutex;
#endif
#ifdef __GTHREAD_MUTEX_INIT_FUNCTION
static void
emergency_mutex_init ()
{
__GTHREAD_MUTEX_INIT_FUNCTION (&emergency_mutex);
}
#endif
#endif
extern "C" void *
__cxa_allocate_exception(std::size_t thrown_size)
{
void *ret;
thrown_size += sizeof (__cxa_exception);
ret = std::malloc (thrown_size);
if (! ret)
{
#ifdef __GTHREADS
#ifdef __GTHREAD_MUTEX_INIT_FUNCTION
static __gthread_once_t once = __GTHREAD_ONCE_INIT;
__gthread_once (&once, emergency_mutex_init);
#endif
__gthread_mutex_lock (&emergency_mutex);
#endif
bitmask_type used = emergency_used;
unsigned int which = 0;
if (thrown_size > EMERGENCY_OBJ_SIZE)
goto failed;
while (used & 1)
{
used >>= 1;
if (++which >= EMERGENCY_OBJ_COUNT)
goto failed;
}
emergency_used |= (bitmask_type)1 << which;
ret = &emergency_buffer[which][0];
failed:;
#ifdef __GTHREADS
__gthread_mutex_unlock (&emergency_mutex);
#endif
if (!ret)
std::terminate ();
}
std::memset (ret, 0, sizeof (__cxa_exception));
return (void *)((char *)ret + sizeof (__cxa_exception));
}
extern "C" void
__cxa_free_exception(void *vptr)
{
char *ptr = (char *) vptr;
if (ptr >= &emergency_buffer[0][0]
&& ptr < &emergency_buffer[0][0] + sizeof (emergency_buffer))
{
unsigned int which
= (unsigned)(ptr - &emergency_buffer[0][0]) / EMERGENCY_OBJ_SIZE;
#ifdef __GTHREADS
__gthread_mutex_lock (&emergency_mutex);
emergency_used &= ~((bitmask_type)1 << which);
__gthread_mutex_unlock (&emergency_mutex);
#else
emergency_used &= ~((bitmask_type)1 << which);
#endif
}
else
std::free (ptr - sizeof (__cxa_exception));
}
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