libguile/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 #if HAVE_CONFIG_H
  43 #  include <config.h>
  44 #endif
  45
  46 #include <string.h>
  47 #include "vm-bootstrap.h"
  48 #include "frames.h"
  49
  50 \f
  51 scm_t_bits scm_tc16_vm_frame;
  52
  53 #define RELOC(frame, val) (val + SCM_VM_FRAME_OFFSET (frame))
  54
  55 SCM
  56 scm_c_make_vm_frame (SCM stack_holder, SCM *fp, SCM *sp,
  57                      scm_byte_t *ip, scm_t_ptrdiff offset)
  58 {
  59   struct scm_vm_frame *p = scm_gc_malloc (sizeof (struct scm_vm_frame),
  60                                           "vmframe");
  61   p->stack_holder = stack_holder;
  62   p->fp = fp;
  63   p->sp = sp;
  64   p->ip = ip;
  65   p->offset = offset;
  66   SCM_RETURN_NEWSMOB (scm_tc16_vm_frame, p);
  67 }
  68
  69 static SCM
  70 vm_frame_mark (SCM obj)
  71 {
  72   return SCM_VM_FRAME_STACK_HOLDER (obj);
  73 }
  74
  75 static scm_sizet
  76 vm_frame_free (SCM obj)
  77 {
  78   struct scm_vm_frame *p = SCM_VM_FRAME_DATA (obj);
  79   scm_gc_free (p, sizeof(struct scm_vm_frame), "vmframe");
  80   return 0;
  81 }
  82
  83 /* Scheme interface */
  84
  85 SCM_DEFINE (scm_vm_frame_p, "vm-frame?", 1, 0, 0,
  86             (SCM obj),
  87             "")
  88 #define FUNC_NAME s_scm_vm_frame_p
  89 {
  90   return SCM_BOOL (SCM_VM_FRAME_P (obj));
  91 }
  92 #undef FUNC_NAME
  93
  94 SCM_DEFINE (scm_vm_frame_program, "vm-frame-program", 1, 0, 0,
  95             (SCM frame),
  96             "")
  97 #define FUNC_NAME s_scm_vm_frame_program
  98 {
  99   SCM_VALIDATE_VM_FRAME (1, frame);
 100   return SCM_FRAME_PROGRAM (SCM_VM_FRAME_FP (frame));
 101 }
 102 #undef FUNC_NAME
 103
 104 SCM_DEFINE (scm_vm_frame_arguments, "vm-frame-arguments", 1, 0, 0,
 105             (SCM frame),
 106             "")
 107 #define FUNC_NAME s_scm_vm_frame_arguments
 108 {
 109   SCM *fp;
 110   int i;
 111   struct scm_program *bp;
 112   SCM ret;
 113
 114   SCM_VALIDATE_VM_FRAME (1, frame);
 115
 116   fp = SCM_VM_FRAME_FP (frame);
 117   bp = SCM_PROGRAM_DATA (SCM_FRAME_PROGRAM (fp));
 118
 119   if (!bp->nargs)
 120     return SCM_EOL;
 121   else if (bp->nrest)
 122     ret = fp[bp->nargs - 1];
 123   else
 124     ret = scm_cons (fp[bp->nargs - 1], SCM_EOL);
 125
 126   for (i = bp->nargs - 2; i >= 0; i--)
 127     ret = scm_cons (fp[i], ret);
 128
 129   return ret;
 130 }
 131 #undef FUNC_NAME
 132
 133 SCM_DEFINE (scm_vm_frame_source, "vm-frame-source", 1, 0, 0,
 134             (SCM frame),
 135             "")
 136 #define FUNC_NAME s_scm_vm_frame_source
 137 {
 138   SCM *fp;
 139   struct scm_program *bp;
 140
 141   SCM_VALIDATE_VM_FRAME (1, frame);
 142
 143   fp = SCM_VM_FRAME_FP (frame);
 144   bp = SCM_PROGRAM_DATA (SCM_FRAME_PROGRAM (fp));
 145
 146   return scm_c_program_source (bp, SCM_VM_FRAME_IP (frame) - bp->base);
 147 }
 148 #undef FUNC_NAME
 149
 150 SCM_DEFINE (scm_vm_frame_local_ref, "vm-frame-local-ref", 2, 0, 0,
 151             (SCM frame, SCM index),
 152             "")
 153 #define FUNC_NAME s_scm_vm_frame_local_ref
 154 {
 155   SCM *fp;
 156   unsigned int i;
 157   struct scm_program *bp;
 158
 159   SCM_VALIDATE_VM_FRAME (1, frame);
 160
 161   fp = SCM_VM_FRAME_FP (frame);
 162   bp = SCM_PROGRAM_DATA (SCM_FRAME_PROGRAM (fp));
 163
 164   SCM_VALIDATE_UINT_COPY (2, index, i);
 165   SCM_ASSERT_RANGE (2, index, i < bp->nargs + bp->nlocs);
 166
 167   return SCM_FRAME_VARIABLE (fp, i);
 168 }
 169 #undef FUNC_NAME
 170
 171 SCM_DEFINE (scm_vm_frame_local_set_x, "vm-frame-local-set!", 3, 0, 0,
 172             (SCM frame, SCM index, SCM val),
 173             "")
 174 #define FUNC_NAME s_scm_vm_frame_local_set_x
 175 {
 176   SCM *fp;
 177   unsigned int i;
 178   struct scm_program *bp;
 179
 180   SCM_VALIDATE_VM_FRAME (1, frame);
 181
 182   fp = SCM_VM_FRAME_FP (frame);
 183   bp = SCM_PROGRAM_DATA (SCM_FRAME_PROGRAM (fp));
 184
 185   SCM_VALIDATE_UINT_COPY (2, index, i);
 186   SCM_ASSERT_RANGE (2, index, i < bp->nargs + bp->nlocs);
 187
 188   SCM_FRAME_VARIABLE (fp, i) = val;
 189
 190   return SCM_UNSPECIFIED;
 191 }
 192 #undef FUNC_NAME
 193
 194 SCM_DEFINE (scm_vm_frame_return_address, "vm-frame-return-address", 1, 0, 0,
 195             (SCM frame),
 196             "")
 197 #define FUNC_NAME s_scm_vm_frame_return_address
 198 {
 199   SCM_VALIDATE_VM_FRAME (1, frame);
 200   return scm_from_ulong ((unsigned long)
 201                          (SCM_FRAME_RETURN_ADDRESS
 202                           (SCM_VM_FRAME_FP (frame))));
 203 }
 204 #undef FUNC_NAME
 205
 206 SCM_DEFINE (scm_vm_frame_mv_return_address, "vm-frame-mv-return-address", 1, 0, 0,
 207             (SCM frame),
 208             "")
 209 #define FUNC_NAME s_scm_vm_frame_mv_return_address
 210 {
 211   SCM_VALIDATE_VM_FRAME (1, frame);
 212   return scm_from_ulong ((unsigned long)
 213                          (SCM_FRAME_MV_RETURN_ADDRESS
 214                           (SCM_VM_FRAME_FP (frame))));
 215 }
 216 #undef FUNC_NAME
 217
 218 SCM_DEFINE (scm_vm_frame_dynamic_link, "vm-frame-dynamic-link", 1, 0, 0,
 219             (SCM frame),
 220             "")
 221 #define FUNC_NAME s_scm_vm_frame_dynamic_link
 222 {
 223   SCM_VALIDATE_VM_FRAME (1, frame);
 224   /* fixme: munge fp if holder is a continuation */
 225   return scm_from_ulong
 226     ((unsigned long)
 227      RELOC (frame,
 228             SCM_FRAME_DYNAMIC_LINK (SCM_VM_FRAME_FP (frame))));
 229 }
 230 #undef FUNC_NAME
 231
 232 SCM_DEFINE (scm_vm_frame_external_link, "vm-frame-external-link", 1, 0, 0,
 233             (SCM frame),
 234             "")
 235 #define FUNC_NAME s_scm_vm_frame_external_link
 236 {
 237   SCM_VALIDATE_VM_FRAME (1, frame);
 238   return SCM_FRAME_EXTERNAL_LINK (SCM_VM_FRAME_FP (frame));
 239 }
 240 #undef FUNC_NAME
 241
 242 SCM_DEFINE (scm_vm_frame_stack, "vm-frame-stack", 1, 0, 0,
 243             (SCM frame),
 244             "")
 245 #define FUNC_NAME s_scm_vm_frame_stack
 246 {
 247   SCM *top, *bottom, ret = SCM_EOL;
 248
 249   SCM_VALIDATE_VM_FRAME (1, frame);
 250
 251   top = SCM_VM_FRAME_SP (frame);
 252   bottom = SCM_FRAME_UPPER_ADDRESS (SCM_VM_FRAME_FP (frame));
 253   while (bottom <= top)
 254     ret = scm_cons (*bottom++, ret);
 255
 256   return ret;
 257 }
 258 #undef FUNC_NAME
 259
 260 extern SCM
 261 scm_c_vm_frame_prev (SCM frame)
 262 {
 263   SCM *this_fp, *new_fp, *new_sp;
 264   this_fp = SCM_VM_FRAME_FP (frame);
 265   new_fp = SCM_FRAME_DYNAMIC_LINK (this_fp);
 266   if (new_fp)
 267     { new_fp = RELOC (frame, new_fp);
 268       new_sp = SCM_FRAME_LOWER_ADDRESS (this_fp) - 1;
 269       return scm_c_make_vm_frame (SCM_VM_FRAME_STACK_HOLDER (frame),
 270                                   new_fp, new_sp,
 271                                   SCM_FRAME_RETURN_ADDRESS (this_fp),
 272                                   SCM_VM_FRAME_OFFSET (frame));
 273     }
 274   else
 275     return SCM_BOOL_F;
 276 }
 277
 278 \f
 279 void
 280 scm_bootstrap_frames (void)
 281 {
 282   scm_tc16_vm_frame = scm_make_smob_type ("vm-frame", 0);
 283   scm_set_smob_mark (scm_tc16_vm_frame, vm_frame_mark);
 284   scm_set_smob_free (scm_tc16_vm_frame, vm_frame_free);
 285 }
 286
 287 void
 288 scm_init_frames (void)
 289 {
 290   scm_bootstrap_vm ();
 291
 292 #ifndef SCM_MAGIC_SNARFER
 293 #include "frames.x"
 294 #endif
 295 }
 296
 297 /*
 298   Local Variables:
 299   c-file-style: "gnu"
 300   End:
 301 */