164 lines
4.4 KiB
C++
164 lines
4.4 KiB
C++
// -*- C++ -*- Allocate exception objects.
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// Copyright (C) 2001, 2004 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 2, 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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// You should have received a copy of the GNU General Public License
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// along with GCC; see the file COPYING. If not, write to
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// the Free Software Foundation, 59 Temple Place - Suite 330,
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// Boston, MA 02111-1307, USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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// This is derived from the C++ ABI for IA-64. Where we diverge
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// for cross-architecture compatibility are noted with "@@@".
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#include <cstdlib>
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#include <cstring>
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#include <climits>
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#include <exception>
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#include "unwind-cxx.h"
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#include "bits/c++config.h"
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#include "bits/gthr.h"
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using namespace __cxxabiv1;
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// ??? How to control these parameters.
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// Guess from the size of basic types how large a buffer is reasonable.
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// Note that the basic c++ exception header has 13 pointers and 2 ints,
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// so on a system with PSImode pointers we're talking about 56 bytes
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// just for overhead.
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#if INT_MAX == 32767
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# define EMERGENCY_OBJ_SIZE 128
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# define EMERGENCY_OBJ_COUNT 16
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#elif LONG_MAX == 2147483647
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# define EMERGENCY_OBJ_SIZE 512
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# define EMERGENCY_OBJ_COUNT 32
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#else
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# define EMERGENCY_OBJ_SIZE 1024
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# define EMERGENCY_OBJ_COUNT 64
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#endif
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#ifndef __GTHREADS
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# undef EMERGENCY_OBJ_COUNT
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# define EMERGENCY_OBJ_COUNT 4
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#endif
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#if INT_MAX == 32767 || EMERGENCY_OBJ_COUNT <= 32
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typedef unsigned int bitmask_type;
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#else
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typedef unsigned long bitmask_type;
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#endif
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typedef char one_buffer[EMERGENCY_OBJ_SIZE] __attribute__((aligned));
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static one_buffer emergency_buffer[EMERGENCY_OBJ_COUNT];
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static bitmask_type emergency_used;
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#ifdef __GTHREADS
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#ifdef __GTHREAD_MUTEX_INIT
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static __gthread_mutex_t emergency_mutex =__GTHREAD_MUTEX_INIT;
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#else
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static __gthread_mutex_t emergency_mutex;
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#endif
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#ifdef __GTHREAD_MUTEX_INIT_FUNCTION
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static void
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emergency_mutex_init ()
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{
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__GTHREAD_MUTEX_INIT_FUNCTION (&emergency_mutex);
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}
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#endif
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#endif
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extern "C" void *
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__cxa_allocate_exception(std::size_t thrown_size) throw()
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{
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void *ret;
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thrown_size += sizeof (__cxa_exception);
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ret = std::malloc (thrown_size);
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if (! ret)
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{
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#ifdef __GTHREADS
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#ifdef __GTHREAD_MUTEX_INIT_FUNCTION
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static __gthread_once_t once = __GTHREAD_ONCE_INIT;
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__gthread_once (&once, emergency_mutex_init);
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#endif
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__gthread_mutex_lock (&emergency_mutex);
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#endif
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bitmask_type used = emergency_used;
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unsigned int which = 0;
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if (thrown_size > EMERGENCY_OBJ_SIZE)
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goto failed;
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while (used & 1)
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{
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used >>= 1;
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if (++which >= EMERGENCY_OBJ_COUNT)
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goto failed;
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}
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emergency_used |= (bitmask_type)1 << which;
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ret = &emergency_buffer[which][0];
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failed:;
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#ifdef __GTHREADS
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__gthread_mutex_unlock (&emergency_mutex);
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#endif
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if (!ret)
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std::terminate ();
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}
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std::memset (ret, 0, sizeof (__cxa_exception));
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return (void *)((char *)ret + sizeof (__cxa_exception));
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}
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extern "C" void
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__cxa_free_exception(void *vptr) throw()
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{
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char *ptr = (char *) vptr;
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if (ptr >= &emergency_buffer[0][0]
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&& ptr < &emergency_buffer[0][0] + sizeof (emergency_buffer))
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{
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unsigned int which
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= (unsigned)(ptr - &emergency_buffer[0][0]) / EMERGENCY_OBJ_SIZE;
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#ifdef __GTHREADS
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__gthread_mutex_lock (&emergency_mutex);
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emergency_used &= ~((bitmask_type)1 << which);
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__gthread_mutex_unlock (&emergency_mutex);
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#else
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emergency_used &= ~((bitmask_type)1 << which);
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#endif
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}
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else
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std::free (ptr - sizeof (__cxa_exception));
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}
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