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_must_malloc (size, "scm_c_make_heap_frame");
  56   SCM_NEWSMOB (frame, scm_tc16_heap_frame, p);
  57   p[0] = frame; /* self link */
  58   memcpy (p + 1, lower, size - sizeof (SCM));
  59   return frame;
  60 }
  61
  62 static SCM
  63 heap_frame_mark (SCM obj)
  64 {
  65   SCM *sp;
  66   SCM *fp = SCM_HEAP_FRAME_POINTER (obj);
  67   SCM *limit = &SCM_FRAME_HEAP_LINK (fp);
  68
  69   for (sp = SCM_FRAME_LOWER_ADDRESS (fp); sp <= limit; sp++)
  70     if (SCM_NIMP (*sp))
  71       scm_gc_mark (*sp);
  72
  73   return SCM_BOOL_F;
  74 }
  75
  76 static scm_sizet
  77 heap_frame_free (SCM obj)
  78 {
  79   SCM *fp = SCM_HEAP_FRAME_POINTER (obj);
  80   SCM *lower = SCM_FRAME_LOWER_ADDRESS (fp);
  81   SCM *upper = SCM_FRAME_UPPER_ADDRESS (fp);
  82   size_t size = sizeof (SCM) * (upper - lower + 1);
  83   scm_must_free (SCM_HEAP_FRAME_DATA (obj));
  84   return size;
  85 }
  86
  87 /* Scheme interface */
  88
  89 SCM_DEFINE (scm_frame_p, "frame?", 1, 0, 0,
  90             (SCM obj),
  91             "")
  92 #define FUNC_NAME s_scm_frame_p
  93 {
  94   return SCM_BOOL (SCM_HEAP_FRAME_P (obj));
  95 }
  96 #undef FUNC_NAME
  97
  98 SCM_DEFINE (scm_frame_program, "frame-program", 1, 0, 0,
  99             (SCM frame),
 100             "")
 101 #define FUNC_NAME s_scm_frame_program
 102 {
 103   SCM_VALIDATE_HEAP_FRAME (1, frame);
 104   return SCM_FRAME_PROGRAM (SCM_HEAP_FRAME_POINTER (frame));
 105 }
 106 #undef FUNC_NAME
 107
 108 SCM_DEFINE (scm_frame_local_ref, "frame-local-ref", 2, 0, 0,
 109             (SCM frame, SCM index),
 110             "")
 111 #define FUNC_NAME s_scm_frame_local_ref
 112 {
 113   SCM_VALIDATE_HEAP_FRAME (1, frame);
 114   SCM_VALIDATE_INUM (2, index); /* FIXME: Check the range! */
 115   return SCM_FRAME_VARIABLE (SCM_HEAP_FRAME_POINTER (frame),
 116                              SCM_INUM (index));
 117 }
 118 #undef FUNC_NAME
 119
 120 SCM_DEFINE (scm_frame_local_set_x, "frame-local-set!", 3, 0, 0,
 121             (SCM frame, SCM index, SCM val),
 122             "")
 123 #define FUNC_NAME s_scm_frame_local_set_x
 124 {
 125   SCM_VALIDATE_HEAP_FRAME (1, frame);
 126   SCM_VALIDATE_INUM (2, index); /* FIXME: Check the range! */
 127   SCM_FRAME_VARIABLE (SCM_HEAP_FRAME_POINTER (frame), SCM_INUM (index)) = val;
 128   return SCM_UNSPECIFIED;
 129 }
 130 #undef FUNC_NAME
 131
 132 SCM_DEFINE (scm_frame_return_address, "frame-return-address", 1, 0, 0,
 133             (SCM frame),
 134             "")
 135 #define FUNC_NAME s_scm_frame_return_address
 136 {
 137   SCM_VALIDATE_HEAP_FRAME (1, frame);
 138   return scm_ulong2num ((unsigned long) (SCM_FRAME_RETURN_ADDRESS
 139                                          (SCM_HEAP_FRAME_POINTER (frame))));
 140 }
 141 #undef FUNC_NAME
 142
 143 SCM_DEFINE (scm_frame_dynamic_link, "frame-dynamic-link", 1, 0, 0,
 144             (SCM frame),
 145             "")
 146 #define FUNC_NAME s_scm_frame_dynamic_link
 147 {
 148   SCM_VALIDATE_HEAP_FRAME (1, frame);
 149   return SCM_FRAME_HEAP_LINK (SCM_HEAP_FRAME_POINTER (frame));
 150 }
 151 #undef FUNC_NAME
 152
 153 SCM_DEFINE (scm_frame_external_link, "frame-external-link", 1, 0, 0,
 154             (SCM frame),
 155             "")
 156 #define FUNC_NAME s_scm_frame_external_link
 157 {
 158   SCM_VALIDATE_HEAP_FRAME (1, frame);
 159   return SCM_FRAME_EXTERNAL_LINK (SCM_HEAP_FRAME_POINTER (frame));
 160 }
 161 #undef FUNC_NAME
 162
 163 \f
 164 void
 165 scm_init_frames (void)
 166 {
 167   scm_tc16_heap_frame = scm_make_smob_type ("frame", 0);
 168   scm_set_smob_mark (scm_tc16_heap_frame, heap_frame_mark);
 169   scm_set_smob_free (scm_tc16_heap_frame, heap_frame_free);
 170
 171 #ifndef SCM_MAGIC_SNARFER
 172 #include "frames.x"
 173 #endif
 174 }
 175
 176 /*
 177   Local Variables:
 178   c-file-style: "gnu"
 179   End:
 180 */