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 int
  70 vm_frame_print (SCM frame, SCM port, scm_print_state *pstate)
  71 {
  72   scm_puts ("#<vm-frame ", port);
  73   scm_uintprint (SCM_UNPACK (frame), 16, port);
  74   scm_putc (' ', port);
  75   scm_write (scm_vm_frame_program (frame), port);
  76   /* don't write args, they can get us into trouble. */
  77   scm_puts (">", port);
  78
  79   return 1;
  80 }
  81
  82 \f
  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_objcode *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_objcode *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 (SCM_FRAME_PROGRAM (fp),
 147                                SCM_VM_FRAME_IP (frame) - bp->base);
 148 }
 149 #undef FUNC_NAME
 150
 151 SCM_DEFINE (scm_vm_frame_local_ref, "vm-frame-local-ref", 2, 0, 0,
 152             (SCM frame, SCM index),
 153             "")
 154 #define FUNC_NAME s_scm_vm_frame_local_ref
 155 {
 156   SCM *fp;
 157   unsigned int i;
 158   struct scm_objcode *bp;
 159
 160   SCM_VALIDATE_VM_FRAME (1, frame);
 161
 162   fp = SCM_VM_FRAME_FP (frame);
 163   bp = SCM_PROGRAM_DATA (SCM_FRAME_PROGRAM (fp));
 164
 165   SCM_VALIDATE_UINT_COPY (2, index, i);
 166   SCM_ASSERT_RANGE (2, index, i < bp->nargs + bp->nlocs);
 167
 168   return SCM_FRAME_VARIABLE (fp, i);
 169 }
 170 #undef FUNC_NAME
 171
 172 SCM_DEFINE (scm_vm_frame_local_set_x, "vm-frame-local-set!", 3, 0, 0,
 173             (SCM frame, SCM index, SCM val),
 174             "")
 175 #define FUNC_NAME s_scm_vm_frame_local_set_x
 176 {
 177   SCM *fp;
 178   unsigned int i;
 179   struct scm_objcode *bp;
 180
 181   SCM_VALIDATE_VM_FRAME (1, frame);
 182
 183   fp = SCM_VM_FRAME_FP (frame);
 184   bp = SCM_PROGRAM_DATA (SCM_FRAME_PROGRAM (fp));
 185
 186   SCM_VALIDATE_UINT_COPY (2, index, i);
 187   SCM_ASSERT_RANGE (2, index, i < bp->nargs + bp->nlocs);
 188
 189   SCM_FRAME_VARIABLE (fp, i) = val;
 190
 191   return SCM_UNSPECIFIED;
 192 }
 193 #undef FUNC_NAME
 194
 195 SCM_DEFINE (scm_vm_frame_return_address, "vm-frame-return-address", 1, 0, 0,
 196             (SCM frame),
 197             "")
 198 #define FUNC_NAME s_scm_vm_frame_return_address
 199 {
 200   SCM_VALIDATE_VM_FRAME (1, frame);
 201   return scm_from_ulong ((unsigned long)
 202                          (SCM_FRAME_RETURN_ADDRESS
 203                           (SCM_VM_FRAME_FP (frame))));
 204 }
 205 #undef FUNC_NAME
 206
 207 SCM_DEFINE (scm_vm_frame_mv_return_address, "vm-frame-mv-return-address", 1, 0, 0,
 208             (SCM frame),
 209             "")
 210 #define FUNC_NAME s_scm_vm_frame_mv_return_address
 211 {
 212   SCM_VALIDATE_VM_FRAME (1, frame);
 213   return scm_from_ulong ((unsigned long)
 214                          (SCM_FRAME_MV_RETURN_ADDRESS
 215                           (SCM_VM_FRAME_FP (frame))));
 216 }
 217 #undef FUNC_NAME
 218
 219 SCM_DEFINE (scm_vm_frame_dynamic_link, "vm-frame-dynamic-link", 1, 0, 0,
 220             (SCM frame),
 221             "")
 222 #define FUNC_NAME s_scm_vm_frame_dynamic_link
 223 {
 224   SCM_VALIDATE_VM_FRAME (1, frame);
 225   /* fixme: munge fp if holder is a continuation */
 226   return scm_from_ulong
 227     ((unsigned long)
 228      RELOC (frame,
 229             SCM_FRAME_DYNAMIC_LINK (SCM_VM_FRAME_FP (frame))));
 230 }
 231 #undef FUNC_NAME
 232
 233 SCM_DEFINE (scm_vm_frame_external_link, "vm-frame-external-link", 1, 0, 0,
 234             (SCM frame),
 235             "")
 236 #define FUNC_NAME s_scm_vm_frame_external_link
 237 {
 238   SCM_VALIDATE_VM_FRAME (1, frame);
 239   return SCM_FRAME_EXTERNAL_LINK (SCM_VM_FRAME_FP (frame));
 240 }
 241 #undef FUNC_NAME
 242
 243 SCM_DEFINE (scm_vm_frame_stack, "vm-frame-stack", 1, 0, 0,
 244             (SCM frame),
 245             "")
 246 #define FUNC_NAME s_scm_vm_frame_stack
 247 {
 248   SCM *top, *bottom, ret = SCM_EOL;
 249
 250   SCM_VALIDATE_VM_FRAME (1, frame);
 251
 252   top = SCM_VM_FRAME_SP (frame);
 253   bottom = SCM_FRAME_UPPER_ADDRESS (SCM_VM_FRAME_FP (frame));
 254   while (bottom <= top)
 255     ret = scm_cons (*bottom++, ret);
 256
 257   return ret;
 258 }
 259 #undef FUNC_NAME
 260
 261 extern SCM
 262 scm_c_vm_frame_prev (SCM frame)
 263 {
 264   SCM *this_fp, *new_fp, *new_sp;
 265   this_fp = SCM_VM_FRAME_FP (frame);
 266   new_fp = SCM_FRAME_DYNAMIC_LINK (this_fp);
 267   if (new_fp)
 268     { new_fp = RELOC (frame, new_fp);
 269       new_sp = SCM_FRAME_LOWER_ADDRESS (this_fp) - 1;
 270       return scm_c_make_vm_frame (SCM_VM_FRAME_STACK_HOLDER (frame),
 271                                   new_fp, new_sp,
 272                                   SCM_FRAME_RETURN_ADDRESS (this_fp),
 273                                   SCM_VM_FRAME_OFFSET (frame));
 274     }
 275   else
 276     return SCM_BOOL_F;
 277 }
 278
 279 \f
 280 void
 281 scm_bootstrap_frames (void)
 282 {
 283   scm_tc16_vm_frame = scm_make_smob_type ("vm-frame", 0);
 284   scm_set_smob_print (scm_tc16_vm_frame, vm_frame_print);
 285 }
 286
 287 void
 288 scm_init_frames (void)
 289 {
 290   scm_bootstrap_vm ();
 291
 292 #ifndef SCM_MAGIC_SNARFER
 293 #include "libguile/frames.x"
 294 #endif
 295 }
 296
 297 /*
 298   Local Variables:
 299   c-file-style: "gnu"
 300   End:
 301 */