libguile/stackchk.h

   1 /* classes: h_files */
   2
   3 #ifndef STACKCHKH
   4 #define STACKCHKH
   5 /*      Copyright (C) 1995,1996 Free Software Foundation, Inc.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2, or (at your option)
  10  * any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this software; see the file COPYING.  If not, write to
  19  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  20  *
  21  * As a special exception, the Free Software Foundation gives permission
  22  * for additional uses of the text contained in its release of GUILE.
  23  *
  24  * The exception is that, if you link the GUILE library with other files
  25  * to produce an executable, this does not by itself cause the
  26  * resulting executable to be covered by the GNU General Public License.
  27  * Your use of that executable is in no way restricted on account of
  28  * linking the GUILE library code into it.
  29  *
  30  * This exception does not however invalidate any other reasons why
  31  * the executable file might be covered by the GNU General Public License.
  32  *
  33  * This exception applies only to the code released by the
  34  * Free Software Foundation under the name GUILE.  If you copy
  35  * code from other Free Software Foundation releases into a copy of
  36  * GUILE, as the General Public License permits, the exception does
  37  * not apply to the code that you add in this way.  To avoid misleading
  38  * anyone as to the status of such modified files, you must delete
  39  * this exception notice from them.
  40  *
  41  * If you write modifications of your own for GUILE, it is your choice
  42  * whether to permit this exception to apply to your modifications.
  43  * If you do not wish that, delete this exception notice.
  44  */
  45 \f
  46 #include "libguile/__scm.h"
  47
  48 #include "libguile/continuations.h"
  49 #ifdef DEBUG_EXTENSIONS
  50 #include "libguile/debug.h"
  51 #endif
  52 \f
  53
  54 /* With debug extensions we have the possibility to use the debug options
  55  * to disable stack checking.
  56  */
  57 #ifdef DEBUG_EXTENSIONS
  58 #define SCM_STACK_CHECKING_P SCM_STACK_LIMIT
  59 #else
  60 /* *fixme* This option should be settable also without debug extensions. */
  61 #define SCM_STACK_LIMIT 100000
  62 #define SCM_STACK_CHECKING_P 1
  63 #endif
  64
  65 #ifdef STACK_CHECKING
  66 # ifdef SCM_STACK_GROWS_UP
  67 #  define SCM_STACK_OVERFLOW_P(s)\
  68    (s - SCM_BASE (scm_rootcont) > SCM_STACK_LIMIT * sizeof (SCM_STACKITEM))
  69 # else
  70 #  define SCM_STACK_OVERFLOW_P(s)\
  71    (SCM_BASE (scm_rootcont) - s > SCM_STACK_LIMIT * sizeof (SCM_STACKITEM))
  72 # endif
  73 # define SCM_CHECK_STACK\
  74     {\
  75        SCM_STACKITEM stack;\
  76        if (SCM_STACK_OVERFLOW_P (&stack) && scm_stack_checking_enabled_p)\
  77          scm_report_stack_overflow ();\
  78     }
  79 #else
  80 # define SCM_CHECK_STACK /**/
  81 #endif /* STACK_CHECKING */
  82
  83 extern int scm_stack_checking_enabled_p;
  84
  85 \f
  86 #ifdef __STDC__
  87 extern void scm_report_stack_overflow (void);
  88 extern long scm_stack_size (SCM_STACKITEM *start);
  89 extern void scm_stack_report (void);
  90 extern void scm_init_stackchk (void);
  91
  92 #else /* STDC */
  93 extern void scm_report_stack_overflow ();
  94 extern long scm_stack_size ();
  95 extern void scm_stack_report ();
  96 extern void scm_init_stackchk ();
  97
  98 #endif /* STDC */
  99
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 106
 107 #endif  /* STACKCHKH */