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be more careful when printing to check for bad objects -------------------- ChangeLog entries follow: -------------------- src/ChangeLog addition: 2010-01-13 Ben Wing <ben@xemacs.org> * print.c: * print.c (internal_object_printer): * print.c (enum printing_badness): * print.c (printing_major_badness): * print.c (print_internal): Clean up the part of the code that looks for things that might lead to crashing in the print code: -- Make the "badness" messages more consistent. -- Move the checks for circularities after the checks for bad memory, since the checks for circularities involve accessing memory (which could be bad). -- Add an extra check to see if the object's implementation structure is bad memory. -- Add extra check for object itself being a null pointer or implementation pointer being null. -- Add some extra comments to help in maintaining the code.
author Ben Wing <ben@xemacs.org>
date Wed, 13 Jan 2010 06:02:42 -0600
parents 141c2920ea48
children 308d34e9f07d
line wrap: on
line source

/* Virtual diry bit implementation for XEmacs.
   Copyright (C) 2005 Marcus Crestani.

This file is part of XEmacs.

XEmacs 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.

XEmacs 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 XEmacs; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* Synched up with: Not in FSF. */

#include "lisp.h"

#ifndef INCLUDED_vdb_h_
#define INCLUDED_vdb_h_


/*--- prototypes -------------------------------------------------------*/

BEGIN_C_DECLS

/* Platform dependent signal handling: */

/* Install the platform-dependent signal handler. */
void vdb_install_signal_handler (void);

/* Platform dependent memory protection. */
void vdb_protect (void *ptr, EMACS_INT len);
void vdb_unprotect (void *ptr, EMACS_INT len);



/* Common (platform independent) virtual diry bit stuff: */

/* Start the write barrier.  This function is called when a garbage
   collection is suspendend and the client is resumed. */
void vdb_start_dirty_bits_recording (void);
/* Stop the write barrier.  This function is called when the client is
   suspendend and garbage collection is resumed. */
void vdb_stop_dirty_bits_recording (void);

/* Record page faults: Add the object pointed to by addr to the write
   barrer's internal data structure that stores modified objects.
   This function is called by the write barrier's fault handler. */
void vdb_designate_modified (void *addr);

/* Propagate page faults to garbage collector: Read out the write
   barrier's internal data structure that stores modified objects and
   pass the information to the garbage collector.  This function is
   called by vdb_stop_dirty_bits_recording().  Return how many objects
   have to be re-examined by the garbage collector. */
int vdb_read_dirty_bits (void);

/* Provides Lisp functions for testing vdb implementation. */
void syms_of_vdb (void);

END_C_DECLS

#endif /* INCLUDED_vdb_h_ */