src/frames.c

   1 /* Copyright (C) 2001 Free Software Foundation, Inc.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2, or (at your option)
   6  * any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this software; see the file COPYING.  If not, write to
  15  * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  16  * Boston, MA 02111-1307 USA
  17  *
  18  * As a special exception, the Free Software Foundation gives permission
  19  * for additional uses of the text contained in its release of GUILE.
  20  *
  21  * The exception is that, if you link the GUILE library with other files
  22  * to produce an executable, this does not by itself cause the
  23  * resulting executable to be covered by the GNU General Public License.
  24  * Your use of that executable is in no way restricted on account of
  25  * linking the GUILE library code into it.
  26  *
  27  * This exception does not however invalidate any other reasons why
  28  * the executable file might be covered by the GNU General Public License.
  29  *
  30  * This exception applies only to the code released by the
  31  * Free Software Foundation under the name GUILE.  If you copy
  32  * code from other Free Software Foundation releases into a copy of
  33  * GUILE, as the General Public License permits, the exception does
  34  * not apply to the code that you add in this way.  To avoid misleading
  35  * anyone as to the status of such modified files, you must delete
  36  * this exception notice from them.
  37  *
  38  * If you write modifications of your own for GUILE, it is your choice
  39  * whether to permit this exception to apply to your modifications.
  40  * If you do not wish that, delete this exception notice.  */
  41
  42 #include <string.h>
  43 #include "frames.h"
  44
  45 \f
  46 scm_t_bits scm_tc16_heap_frame;
  47
  48 SCM
  49 scm_c_make_heap_frame (SCM *fp)
  50 {
  51   SCM frame;
  52   SCM *lower = SCM_FRAME_LOWER_ADDRESS (fp);
  53   SCM *upper = SCM_FRAME_UPPER_ADDRESS (fp);
  54   size_t size = sizeof (SCM) * (upper - lower + 1);
  55   SCM *p = scm_gc_malloc (size, "frame");
  56
  57   SCM_NEWSMOB (frame, scm_tc16_heap_frame, p);
  58   p[0] = frame; /* self link */
  59   memcpy (p + 1, lower, size - sizeof (SCM));
  60
  61   return frame;
  62 }
  63
  64 static SCM
  65 heap_frame_mark (SCM obj)
  66 {
  67   SCM *sp;
  68   SCM *fp = SCM_HEAP_FRAME_POINTER (obj);
  69   SCM *limit = &SCM_FRAME_HEAP_LINK (fp);
  70
  71   for (sp = SCM_FRAME_LOWER_ADDRESS (fp); sp <= limit; sp++)
  72     if (SCM_NIMP (*sp))
  73       scm_gc_mark (*sp);
  74
  75   return SCM_BOOL_F;
  76 }
  77
  78 static scm_sizet
  79 heap_frame_free (SCM obj)
  80 {
  81   SCM *fp = SCM_HEAP_FRAME_POINTER (obj);
  82   SCM *lower = SCM_FRAME_LOWER_ADDRESS (fp);
  83   SCM *upper = SCM_FRAME_UPPER_ADDRESS (fp);
  84   size_t size = sizeof (SCM) * (upper - lower + 1);
  85
  86   scm_gc_free (SCM_HEAP_FRAME_DATA (obj), size, "frame");
  87
  88   return 0;
  89 }
  90
  91 /* Scheme interface */
  92
  93 SCM_DEFINE (scm_frame_p, "frame?", 1, 0, 0,
  94             (SCM obj),
  95             "")
  96 #define FUNC_NAME s_scm_frame_p
  97 {
  98   return SCM_BOOL (SCM_HEAP_FRAME_P (obj));
  99 }
 100 #undef FUNC_NAME
 101
 102 SCM_DEFINE (scm_frame_program, "frame-program", 1, 0, 0,
 103             (SCM frame),
 104             "")
 105 #define FUNC_NAME s_scm_frame_program
 106 {
 107   SCM_VALIDATE_HEAP_FRAME (1, frame);
 108   return SCM_FRAME_PROGRAM (SCM_HEAP_FRAME_POINTER (frame));
 109 }
 110 #undef FUNC_NAME
 111
 112 SCM_DEFINE (scm_frame_local_ref, "frame-local-ref", 2, 0, 0,
 113             (SCM frame, SCM index),
 114             "")
 115 #define FUNC_NAME s_scm_frame_local_ref
 116 {
 117   SCM_VALIDATE_HEAP_FRAME (1, frame);
 118   SCM_VALIDATE_INUM (2, index); /* FIXME: Check the range! */
 119   return SCM_FRAME_VARIABLE (SCM_HEAP_FRAME_POINTER (frame),
 120                              scm_to_int (index));
 121 }
 122 #undef FUNC_NAME
 123
 124 SCM_DEFINE (scm_frame_local_set_x, "frame-local-set!", 3, 0, 0,
 125             (SCM frame, SCM index, SCM val),
 126             "")
 127 #define FUNC_NAME s_scm_frame_local_set_x
 128 {
 129   SCM_VALIDATE_HEAP_FRAME (1, frame);
 130   SCM_VALIDATE_INUM (2, index); /* FIXME: Check the range! */
 131   SCM_FRAME_VARIABLE (SCM_HEAP_FRAME_POINTER (frame),
 132                       scm_to_int (index)) = val;
 133   return SCM_UNSPECIFIED;
 134 }
 135 #undef FUNC_NAME
 136
 137 SCM_DEFINE (scm_frame_return_address, "frame-return-address", 1, 0, 0,
 138             (SCM frame),
 139             "")
 140 #define FUNC_NAME s_scm_frame_return_address
 141 {
 142   SCM_VALIDATE_HEAP_FRAME (1, frame);
 143   return scm_ulong2num ((unsigned long) (SCM_FRAME_RETURN_ADDRESS
 144                                          (SCM_HEAP_FRAME_POINTER (frame))));
 145 }
 146 #undef FUNC_NAME
 147
 148 SCM_DEFINE (scm_frame_dynamic_link, "frame-dynamic-link", 1, 0, 0,
 149             (SCM frame),
 150             "")
 151 #define FUNC_NAME s_scm_frame_dynamic_link
 152 {
 153   SCM_VALIDATE_HEAP_FRAME (1, frame);
 154   return SCM_FRAME_HEAP_LINK (SCM_HEAP_FRAME_POINTER (frame));
 155 }
 156 #undef FUNC_NAME
 157
 158 SCM_DEFINE (scm_frame_external_link, "frame-external-link", 1, 0, 0,
 159             (SCM frame),
 160             "")
 161 #define FUNC_NAME s_scm_frame_external_link
 162 {
 163   SCM_VALIDATE_HEAP_FRAME (1, frame);
 164   return SCM_FRAME_EXTERNAL_LINK (SCM_HEAP_FRAME_POINTER (frame));
 165 }
 166 #undef FUNC_NAME
 167
 168 \f
 169 void
 170 scm_init_frames (void)
 171 {
 172   scm_tc16_heap_frame = scm_make_smob_type ("frame", 0);
 173   scm_set_smob_mark (scm_tc16_heap_frame, heap_frame_mark);
 174   scm_set_smob_free (scm_tc16_heap_frame, heap_frame_free);
 175
 176 #ifndef SCM_MAGIC_SNARFER
 177 #include "frames.x"
 178 #endif
 179 }
 180
 181 /*
 182   Local Variables:
 183   c-file-style: "gnu"
 184   End:
 185 */