libguile/vm-i-system.c

   1 /* Copyright (C) 2001,2008,2009,2010 Free Software Foundation, Inc.
   2  *
   3  * This library is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU Lesser General Public License
   5  * as published by the Free Software Foundation; either version 3 of
   6  * the License, or (at your option) any later version.
   7  *
   8  * This library is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * Lesser General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public
  14  * License along with this library; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  16  * 02110-1301 USA
  17  */
  18
  19
  20 /* This file is included in vm_engine.c */
  21
  22 \f
  23 /*
  24  * Basic operations
  25  */
  26
  27 VM_DEFINE_INSTRUCTION (0, nop, "nop", 0, 0, 0)
  28 {
  29   NEXT;
  30 }
  31
  32 VM_DEFINE_INSTRUCTION (1, halt, "halt", 0, 0, 0)
  33 {
  34   HALT_HOOK ();
  35   nvalues = SCM_I_INUM (*sp--);
  36   NULLSTACK (1);
  37   if (nvalues == 1)
  38     POP (finish_args);
  39   else
  40     {
  41       POP_LIST (nvalues);
  42       POP (finish_args);
  43       SYNC_REGISTER ();
  44       finish_args = scm_values (finish_args);
  45     }
  46
  47   {
  48 #ifdef VM_ENABLE_STACK_NULLING
  49     SCM *old_sp = sp;
  50 #endif
  51
  52     /* Restore registers */
  53     sp = SCM_FRAME_LOWER_ADDRESS (fp) - 1;
  54     /* Setting the ip here doesn't actually affect control flow, as the calling
  55        code will restore its own registers, but it does help when walking the
  56        stack */
  57     ip = SCM_FRAME_RETURN_ADDRESS (fp);
  58     fp = SCM_FRAME_DYNAMIC_LINK (fp);
  59     NULLSTACK (old_sp - sp);
  60   }
  61
  62   goto vm_done;
  63 }
  64
  65 VM_DEFINE_INSTRUCTION (2, break, "break", 0, 0, 0)
  66 {
  67   BREAK_HOOK ();
  68   NEXT;
  69 }
  70
  71 VM_DEFINE_INSTRUCTION (3, drop, "drop", 0, 1, 0)
  72 {
  73   DROP ();
  74   NEXT;
  75 }
  76
  77 VM_DEFINE_INSTRUCTION (4, dup, "dup", 0, 0, 1)
  78 {
  79   SCM x = *sp;
  80   PUSH (x);
  81   NEXT;
  82 }
  83
  84 \f
  85 /*
  86  * Object creation
  87  */
  88
  89 VM_DEFINE_INSTRUCTION (5, void, "void", 0, 0, 1)
  90 {
  91   PUSH (SCM_UNSPECIFIED);
  92   NEXT;
  93 }
  94
  95 VM_DEFINE_INSTRUCTION (6, make_true, "make-true", 0, 0, 1)
  96 {
  97   PUSH (SCM_BOOL_T);
  98   NEXT;
  99 }
 100
 101 VM_DEFINE_INSTRUCTION (7, make_false, "make-false", 0, 0, 1)
 102 {
 103   PUSH (SCM_BOOL_F);
 104   NEXT;
 105 }
 106
 107 VM_DEFINE_INSTRUCTION (8, make_nil, "make-nil", 0, 0, 1)
 108 {
 109   PUSH (SCM_ELISP_NIL);
 110   NEXT;
 111 }
 112
 113 VM_DEFINE_INSTRUCTION (9, make_eol, "make-eol", 0, 0, 1)
 114 {
 115   PUSH (SCM_EOL);
 116   NEXT;
 117 }
 118
 119 VM_DEFINE_INSTRUCTION (10, make_int8, "make-int8", 1, 0, 1)
 120 {
 121   PUSH (SCM_I_MAKINUM ((signed char) FETCH ()));
 122   NEXT;
 123 }
 124
 125 VM_DEFINE_INSTRUCTION (11, make_int8_0, "make-int8:0", 0, 0, 1)
 126 {
 127   PUSH (SCM_INUM0);
 128   NEXT;
 129 }
 130
 131 VM_DEFINE_INSTRUCTION (12, make_int8_1, "make-int8:1", 0, 0, 1)
 132 {
 133   PUSH (SCM_I_MAKINUM (1));
 134   NEXT;
 135 }
 136
 137 VM_DEFINE_INSTRUCTION (13, make_int16, "make-int16", 2, 0, 1)
 138 {
 139   int h = FETCH ();
 140   int l = FETCH ();
 141   PUSH (SCM_I_MAKINUM ((signed short) (h << 8) + l));
 142   NEXT;
 143 }
 144
 145 VM_DEFINE_INSTRUCTION (14, make_int64, "make-int64", 8, 0, 1)
 146 {
 147   scm_t_uint64 v = 0;
 148   v += FETCH ();
 149   v <<= 8; v += FETCH ();
 150   v <<= 8; v += FETCH ();
 151   v <<= 8; v += FETCH ();
 152   v <<= 8; v += FETCH ();
 153   v <<= 8; v += FETCH ();
 154   v <<= 8; v += FETCH ();
 155   v <<= 8; v += FETCH ();
 156   PUSH (scm_from_int64 ((scm_t_int64) v));
 157   NEXT;
 158 }
 159
 160 VM_DEFINE_INSTRUCTION (15, make_uint64, "make-uint64", 8, 0, 1)
 161 {
 162   scm_t_uint64 v = 0;
 163   v += FETCH ();
 164   v <<= 8; v += FETCH ();
 165   v <<= 8; v += FETCH ();
 166   v <<= 8; v += FETCH ();
 167   v <<= 8; v += FETCH ();
 168   v <<= 8; v += FETCH ();
 169   v <<= 8; v += FETCH ();
 170   v <<= 8; v += FETCH ();
 171   PUSH (scm_from_uint64 (v));
 172   NEXT;
 173 }
 174
 175 VM_DEFINE_INSTRUCTION (16, make_char8, "make-char8", 1, 0, 1)
 176 {
 177   scm_t_uint8 v = 0;
 178   v = FETCH ();
 179
 180   PUSH (SCM_MAKE_CHAR (v));
 181   /* Don't simplify this to PUSH (SCM_MAKE_CHAR (FETCH ())).  The
 182      contents of SCM_MAKE_CHAR may be evaluated more than once,
 183      resulting in a double fetch.  */
 184   NEXT;
 185 }
 186
 187 VM_DEFINE_INSTRUCTION (17, make_char32, "make-char32", 4, 0, 1)
 188 {
 189   scm_t_wchar v = 0;
 190   v += FETCH ();
 191   v <<= 8; v += FETCH ();
 192   v <<= 8; v += FETCH ();
 193   v <<= 8; v += FETCH ();
 194   PUSH (SCM_MAKE_CHAR (v));
 195   NEXT;
 196 }
 197
 198
 199
 200 VM_DEFINE_INSTRUCTION (18, list, "list", 2, -1, 1)
 201 {
 202   unsigned h = FETCH ();
 203   unsigned l = FETCH ();
 204   unsigned len = ((h << 8) + l);
 205   POP_LIST (len);
 206   NEXT;
 207 }
 208
 209 VM_DEFINE_INSTRUCTION (19, vector, "vector", 2, -1, 1)
 210 {
 211   unsigned h = FETCH ();
 212   unsigned l = FETCH ();
 213   unsigned len = ((h << 8) + l);
 214   SCM vect;
 215
 216   SYNC_REGISTER ();
 217   sp++; sp -= len;
 218   CHECK_UNDERFLOW ();
 219   vect = scm_make_vector (scm_from_uint (len), SCM_BOOL_F);
 220   memcpy (SCM_I_VECTOR_WELTS(vect), sp, sizeof(SCM) * len);
 221   NULLSTACK (len);
 222   *sp = vect;
 223
 224   NEXT;
 225 }
 226
 227 \f
 228 /*
 229  * Variable access
 230  */
 231
 232 #define OBJECT_REF(i)           objects[i]
 233 #define OBJECT_SET(i,o)         objects[i] = o
 234
 235 #define LOCAL_REF(i)            SCM_FRAME_VARIABLE (fp, i)
 236 #define LOCAL_SET(i,o)          SCM_FRAME_VARIABLE (fp, i) = o
 237
 238 /* For the variable operations, we _must_ obviously avoid function calls to
 239    `scm_variable_ref ()', `scm_variable_bound_p ()' and friends which do
 240    nothing more than the corresponding macros.  */
 241 #define VARIABLE_REF(v)         SCM_VARIABLE_REF (v)
 242 #define VARIABLE_SET(v,o)       SCM_VARIABLE_SET (v, o)
 243 #define VARIABLE_BOUNDP(v)      (VARIABLE_REF (v) != SCM_UNDEFINED)
 244
 245 #define FREE_VARIABLE_REF(i)    SCM_PROGRAM_FREE_VARIABLE_REF (program, i)
 246
 247 /* ref */
 248
 249 VM_DEFINE_INSTRUCTION (20, object_ref, "object-ref", 1, 0, 1)
 250 {
 251   register unsigned objnum = FETCH ();
 252   CHECK_OBJECT (objnum);
 253   PUSH (OBJECT_REF (objnum));
 254   NEXT;
 255 }
 256
 257 /* FIXME: necessary? elt 255 of the vector could be a vector... */
 258 VM_DEFINE_INSTRUCTION (21, long_object_ref, "long-object-ref", 2, 0, 1)
 259 {
 260   unsigned int objnum = FETCH ();
 261   objnum <<= 8;
 262   objnum += FETCH ();
 263   CHECK_OBJECT (objnum);
 264   PUSH (OBJECT_REF (objnum));
 265   NEXT;
 266 }
 267
 268 VM_DEFINE_INSTRUCTION (22, local_ref, "local-ref", 1, 0, 1)
 269 {
 270   PUSH (LOCAL_REF (FETCH ()));
 271   ASSERT_BOUND (*sp);
 272   NEXT;
 273 }
 274
 275 VM_DEFINE_INSTRUCTION (23, long_local_ref, "long-local-ref", 2, 0, 1)
 276 {
 277   unsigned int i = FETCH ();
 278   i <<= 8;
 279   i += FETCH ();
 280   PUSH (LOCAL_REF (i));
 281   ASSERT_BOUND (*sp);
 282   NEXT;
 283 }
 284
 285 VM_DEFINE_INSTRUCTION (24, local_bound, "local-bound?", 1, 0, 1)
 286 {
 287   if (LOCAL_REF (FETCH ()) == SCM_UNDEFINED)
 288     PUSH (SCM_BOOL_F);
 289   else
 290     PUSH (SCM_BOOL_T);
 291   NEXT;
 292 }
 293
 294 VM_DEFINE_INSTRUCTION (25, long_local_bound, "long-local-bound?", 2, 0, 1)
 295 {
 296   unsigned int i = FETCH ();
 297   i <<= 8;
 298   i += FETCH ();
 299   if (LOCAL_REF (i) == SCM_UNDEFINED)
 300     PUSH (SCM_BOOL_F);
 301   else
 302     PUSH (SCM_BOOL_T);
 303   NEXT;
 304 }
 305
 306 VM_DEFINE_INSTRUCTION (26, variable_ref, "variable-ref", 0, 1, 1)
 307 {
 308   SCM x = *sp;
 309
 310   if (!VARIABLE_BOUNDP (x))
 311     {
 312       finish_args = scm_list_1 (x);
 313       /* Was: finish_args = SCM_LIST1 (SCM_CAR (x)); */
 314       goto vm_error_unbound;
 315     }
 316   else
 317     {
 318       SCM o = VARIABLE_REF (x);
 319       *sp = o;
 320     }
 321
 322   NEXT;
 323 }
 324
 325 VM_DEFINE_INSTRUCTION (27, variable_bound, "variable-bound?", 0, 1, 1)
 326 {
 327   if (VARIABLE_BOUNDP (*sp))
 328     *sp = SCM_BOOL_T;
 329   else
 330     *sp = SCM_BOOL_F;
 331   NEXT;
 332 }
 333
 334 VM_DEFINE_INSTRUCTION (28, toplevel_ref, "toplevel-ref", 1, 0, 1)
 335 {
 336   unsigned objnum = FETCH ();
 337   SCM what;
 338   CHECK_OBJECT (objnum);
 339   what = OBJECT_REF (objnum);
 340
 341   if (!SCM_VARIABLEP (what))
 342     {
 343       SYNC_REGISTER ();
 344       what = resolve_variable (what, scm_program_module (program));
 345       if (!VARIABLE_BOUNDP (what))
 346         {
 347           finish_args = scm_list_1 (what);
 348           goto vm_error_unbound;
 349         }
 350       OBJECT_SET (objnum, what);
 351     }
 352
 353   PUSH (VARIABLE_REF (what));
 354   NEXT;
 355 }
 356
 357 VM_DEFINE_INSTRUCTION (29, long_toplevel_ref, "long-toplevel-ref", 2, 0, 1)
 358 {
 359   SCM what;
 360   unsigned int objnum = FETCH ();
 361   objnum <<= 8;
 362   objnum += FETCH ();
 363   CHECK_OBJECT (objnum);
 364   what = OBJECT_REF (objnum);
 365
 366   if (!SCM_VARIABLEP (what))
 367     {
 368       SYNC_REGISTER ();
 369       what = resolve_variable (what, scm_program_module (program));
 370       if (!VARIABLE_BOUNDP (what))
 371         {
 372           finish_args = scm_list_1 (what);
 373           goto vm_error_unbound;
 374         }
 375       OBJECT_SET (objnum, what);
 376     }
 377
 378   PUSH (VARIABLE_REF (what));
 379   NEXT;
 380 }
 381
 382 /* set */
 383
 384 VM_DEFINE_INSTRUCTION (30, local_set, "local-set", 1, 1, 0)
 385 {
 386   LOCAL_SET (FETCH (), *sp);
 387   DROP ();
 388   NEXT;
 389 }
 390
 391 VM_DEFINE_INSTRUCTION (31, long_local_set, "long-local-set", 2, 1, 0)
 392 {
 393   unsigned int i = FETCH ();
 394   i <<= 8;
 395   i += FETCH ();
 396   LOCAL_SET (i, *sp);
 397   DROP ();
 398   NEXT;
 399 }
 400
 401 VM_DEFINE_INSTRUCTION (32, variable_set, "variable-set", 0, 2, 0)
 402 {
 403   VARIABLE_SET (sp[0], sp[-1]);
 404   DROPN (2);
 405   NEXT;
 406 }
 407
 408 VM_DEFINE_INSTRUCTION (33, toplevel_set, "toplevel-set", 1, 1, 0)
 409 {
 410   unsigned objnum = FETCH ();
 411   SCM what;
 412   CHECK_OBJECT (objnum);
 413   what = OBJECT_REF (objnum);
 414
 415   if (!SCM_VARIABLEP (what))
 416     {
 417       SYNC_BEFORE_GC ();
 418       what = resolve_variable (what, scm_program_module (program));
 419       OBJECT_SET (objnum, what);
 420     }
 421
 422   VARIABLE_SET (what, *sp);
 423   DROP ();
 424   NEXT;
 425 }
 426
 427 VM_DEFINE_INSTRUCTION (34, long_toplevel_set, "long-toplevel-set", 2, 1, 0)
 428 {
 429   SCM what;
 430   unsigned int objnum = FETCH ();
 431   objnum <<= 8;
 432   objnum += FETCH ();
 433   CHECK_OBJECT (objnum);
 434   what = OBJECT_REF (objnum);
 435
 436   if (!SCM_VARIABLEP (what))
 437     {
 438       SYNC_BEFORE_GC ();
 439       what = resolve_variable (what, scm_program_module (program));
 440       OBJECT_SET (objnum, what);
 441     }
 442
 443   VARIABLE_SET (what, *sp);
 444   DROP ();
 445   NEXT;
 446 }
 447
 448 \f
 449 /*
 450  * branch and jump
 451  */
 452
 453 /* offset must be at least 24 bits wide, and signed */
 454 #define FETCH_OFFSET(offset)                    \
 455 {                                               \
 456   offset = FETCH () << 16;                      \
 457   offset += FETCH () << 8;                      \
 458   offset += FETCH ();                           \
 459   offset -= (offset & (1<<23)) << 1;            \
 460 }
 461
 462 #define BR(p)                                   \
 463 {                                               \
 464   scm_t_int32 offset;                           \
 465   FETCH_OFFSET (offset);                        \
 466   if (p)                                        \
 467     ip += offset;                               \
 468   if (offset < 0)                               \
 469     VM_HANDLE_INTERRUPTS;                       \
 470   NULLSTACK (1);                                \
 471   DROP ();                                      \
 472   NEXT;                                         \
 473 }
 474
 475 VM_DEFINE_INSTRUCTION (35, br, "br", 3, 0, 0)
 476 {
 477   scm_t_int32 offset;
 478   FETCH_OFFSET (offset);
 479   ip += offset;
 480   if (offset < 0)
 481     VM_HANDLE_INTERRUPTS;
 482   NEXT;
 483 }
 484
 485 VM_DEFINE_INSTRUCTION (36, br_if, "br-if", 3, 0, 0)
 486 {
 487   BR (scm_is_true_and_not_nil (*sp));
 488 }
 489
 490 VM_DEFINE_INSTRUCTION (37, br_if_not, "br-if-not", 3, 0, 0)
 491 {
 492   BR (scm_is_false_or_nil (*sp));
 493 }
 494
 495 VM_DEFINE_INSTRUCTION (38, br_if_eq, "br-if-eq", 3, 0, 0)
 496 {
 497   sp--; /* underflow? */
 498   BR (scm_is_eq (sp[0], sp[1]));
 499 }
 500
 501 VM_DEFINE_INSTRUCTION (39, br_if_not_eq, "br-if-not-eq", 3, 0, 0)
 502 {
 503   sp--; /* underflow? */
 504   BR (!scm_is_eq (sp[0], sp[1]));
 505 }
 506
 507 VM_DEFINE_INSTRUCTION (40, br_if_null, "br-if-null", 3, 0, 0)
 508 {
 509   BR (scm_is_null_or_nil (*sp));
 510 }
 511
 512 VM_DEFINE_INSTRUCTION (41, br_if_not_null, "br-if-not-null", 3, 0, 0)
 513 {
 514   BR (!scm_is_null_or_nil (*sp));
 515 }
 516
 517 \f
 518 /*
 519  * Subprogram call
 520  */
 521
 522 VM_DEFINE_INSTRUCTION (42, br_if_nargs_ne, "br-if-nargs-ne", 5, 0, 0)
 523 {
 524   scm_t_ptrdiff n;
 525   scm_t_int32 offset;
 526   n = FETCH () << 8;
 527   n += FETCH ();
 528   FETCH_OFFSET (offset);
 529   if (sp - (fp - 1) != n)
 530     ip += offset;
 531   NEXT;
 532 }
 533
 534 VM_DEFINE_INSTRUCTION (43, br_if_nargs_lt, "br-if-nargs-lt", 5, 0, 0)
 535 {
 536   scm_t_ptrdiff n;
 537   scm_t_int32 offset;
 538   n = FETCH () << 8;
 539   n += FETCH ();
 540   FETCH_OFFSET (offset);
 541   if (sp - (fp - 1) < n)
 542     ip += offset;
 543   NEXT;
 544 }
 545
 546 VM_DEFINE_INSTRUCTION (44, br_if_nargs_gt, "br-if-nargs-gt", 5, 0, 0)
 547 {
 548   scm_t_ptrdiff n;
 549   scm_t_int32 offset;
 550
 551   n = FETCH () << 8;
 552   n += FETCH ();
 553   FETCH_OFFSET (offset);
 554   if (sp - (fp - 1) > n)
 555     ip += offset;
 556   NEXT;
 557 }
 558
 559 VM_DEFINE_INSTRUCTION (45, assert_nargs_ee, "assert-nargs-ee", 2, 0, 0)
 560 {
 561   scm_t_ptrdiff n;
 562   n = FETCH () << 8;
 563   n += FETCH ();
 564   if (sp - (fp - 1) != n)
 565     goto vm_error_wrong_num_args;
 566   NEXT;
 567 }
 568
 569 VM_DEFINE_INSTRUCTION (46, assert_nargs_ge, "assert-nargs-ge", 2, 0, 0)
 570 {
 571   scm_t_ptrdiff n;
 572   n = FETCH () << 8;
 573   n += FETCH ();
 574   if (sp - (fp - 1) < n)
 575     goto vm_error_wrong_num_args;
 576   NEXT;
 577 }
 578
 579 VM_DEFINE_INSTRUCTION (47, bind_optionals, "bind-optionals", 2, -1, -1)
 580 {
 581   scm_t_ptrdiff n;
 582   n = FETCH () << 8;
 583   n += FETCH ();
 584   while (sp - (fp - 1) < n)
 585     PUSH (SCM_UNDEFINED);
 586   NEXT;
 587 }
 588
 589 VM_DEFINE_INSTRUCTION (48, bind_optionals_shuffle, "bind-optionals/shuffle", 6, -1, -1)
 590 {
 591   SCM *walk;
 592   scm_t_ptrdiff nreq, nreq_and_opt, ntotal;
 593   nreq = FETCH () << 8;
 594   nreq += FETCH ();
 595   nreq_and_opt = FETCH () << 8;
 596   nreq_and_opt += FETCH ();
 597   ntotal = FETCH () << 8;
 598   ntotal += FETCH ();
 599
 600   /* look in optionals for first keyword or last positional */
 601   /* starting after the last required positional arg */
 602   walk = fp + nreq;
 603   while (/* while we have args */
 604          walk <= sp
 605          /* and we still have positionals to fill */
 606          && walk - fp < nreq_and_opt
 607          /* and we haven't reached a keyword yet */
 608          && !scm_is_keyword (*walk))
 609     /* bind this optional arg (by leaving it in place) */
 610     walk++;
 611   /* now shuffle up, from walk to ntotal */
 612   {
 613     scm_t_ptrdiff nshuf = sp - walk + 1, i;
 614     sp = (fp - 1) + ntotal + nshuf;
 615     CHECK_OVERFLOW ();
 616     for (i = 0; i < nshuf; i++)
 617       sp[-i] = walk[nshuf-i-1];
 618   }
 619   /* and fill optionals & keyword args with SCM_UNDEFINED */
 620   while (walk <= (fp - 1) + ntotal)
 621     *walk++ = SCM_UNDEFINED;
 622
 623   NEXT;
 624 }
 625
 626 /* Flags that determine whether other keywords are allowed, and whether a
 627    rest argument is expected.  These values must match those used by the
 628    glil->assembly compiler.  */
 629 #define F_ALLOW_OTHER_KEYS  1
 630 #define F_REST              2
 631
 632 VM_DEFINE_INSTRUCTION (49, bind_kwargs, "bind-kwargs", 5, 0, 0)
 633 {
 634   scm_t_uint16 idx;
 635   scm_t_ptrdiff nkw;
 636   int kw_and_rest_flags;
 637   SCM kw;
 638   idx = FETCH () << 8;
 639   idx += FETCH ();
 640   /* XXX: We don't actually use NKW.  */
 641   nkw = FETCH () << 8;
 642   nkw += FETCH ();
 643   kw_and_rest_flags = FETCH ();
 644
 645   if (!(kw_and_rest_flags & F_REST)
 646       && ((sp - (fp - 1) - nkw) % 2))
 647     goto vm_error_kwargs_length_not_even;
 648
 649   CHECK_OBJECT (idx);
 650   kw = OBJECT_REF (idx);
 651
 652   /* Switch NKW to be a negative index below SP.  */
 653   for (nkw = -(sp - (fp - 1) - nkw) + 1; nkw < 0; nkw++)
 654     {
 655       SCM walk;
 656
 657       if (scm_is_keyword (sp[nkw]))
 658         {
 659           for (walk = kw; scm_is_pair (walk); walk = SCM_CDR (walk))
 660             {
 661               if (scm_is_eq (SCM_CAAR (walk), sp[nkw]))
 662                 {
 663                   SCM si = SCM_CDAR (walk);
 664                   LOCAL_SET (SCM_I_INUMP (si) ? SCM_I_INUM (si) : scm_to_long (si),
 665                              sp[nkw + 1]);
 666                   break;
 667                 }
 668             }
 669           if (!(kw_and_rest_flags & F_ALLOW_OTHER_KEYS) && !scm_is_pair (walk))
 670             goto vm_error_kwargs_unrecognized_keyword;
 671
 672           nkw++;
 673         }
 674       else if (!(kw_and_rest_flags & F_REST))
 675         goto vm_error_kwargs_invalid_keyword;
 676     }
 677
 678   NEXT;
 679 }
 680
 681 #undef F_ALLOW_OTHER_KEYS
 682 #undef F_REST
 683
 684
 685 VM_DEFINE_INSTRUCTION (50, push_rest, "push-rest", 2, -1, -1)
 686 {
 687   scm_t_ptrdiff n;
 688   SCM rest = SCM_EOL;
 689   n = FETCH () << 8;
 690   n += FETCH ();
 691   while (sp - (fp - 1) > n)
 692     /* No need to check for underflow. */
 693     CONS (rest, *sp--, rest);
 694   PUSH (rest);
 695   NEXT;
 696 }
 697
 698 VM_DEFINE_INSTRUCTION (51, bind_rest, "bind-rest", 4, -1, -1)
 699 {
 700   scm_t_ptrdiff n;
 701   scm_t_uint32 i;
 702   SCM rest = SCM_EOL;
 703   n = FETCH () << 8;
 704   n += FETCH ();
 705   i = FETCH () << 8;
 706   i += FETCH ();
 707   while (sp - (fp - 1) > n)
 708     /* No need to check for underflow. */
 709     CONS (rest, *sp--, rest);
 710   LOCAL_SET (i, rest);
 711   NEXT;
 712 }
 713
 714 VM_DEFINE_INSTRUCTION (52, reserve_locals, "reserve-locals", 2, -1, -1)
 715 {
 716   SCM *old_sp;
 717   scm_t_int32 n;
 718   n = FETCH () << 8;
 719   n += FETCH ();
 720   old_sp = sp;
 721   sp = (fp - 1) + n;
 722
 723   if (old_sp < sp)
 724     {
 725       CHECK_OVERFLOW ();
 726       while (old_sp < sp)
 727         *++old_sp = SCM_UNDEFINED;
 728     }
 729   else
 730     NULLSTACK (old_sp - sp);
 731
 732   NEXT;
 733 }
 734
 735 VM_DEFINE_INSTRUCTION (53, new_frame, "new-frame", 0, 0, 3)
 736 {
 737   /* NB: if you change this, see frames.c:vm-frame-num-locals */
 738   /* and frames.h, vm-engine.c, etc of course */
 739   PUSH ((SCM)fp); /* dynamic link */
 740   PUSH (0);  /* mvra */
 741   PUSH (0);  /* ra */
 742   NEXT;
 743 }
 744
 745 VM_DEFINE_INSTRUCTION (54, call, "call", 1, -1, 1)
 746 {
 747   nargs = FETCH ();
 748
 749  vm_call:
 750   program = sp[-nargs];
 751
 752   VM_HANDLE_INTERRUPTS;
 753
 754   if (SCM_UNLIKELY (!SCM_PROGRAM_P (program)))
 755     {
 756       if (SCM_STRUCTP (program) && SCM_STRUCT_APPLICABLE_P (program))
 757         {
 758           sp[-nargs] = SCM_STRUCT_PROCEDURE (program);
 759           goto vm_call;
 760         }
 761       else if (SCM_NIMP (program) && SCM_TYP7 (program) == scm_tc7_smob
 762                && SCM_SMOB_APPLICABLE_P (program))
 763         {
 764           SYNC_REGISTER ();
 765           sp[-nargs] = scm_i_smob_apply_trampoline (program);
 766           goto vm_call;
 767         }
 768       else
 769         goto vm_error_wrong_type_apply;
 770     }
 771
 772   CACHE_PROGRAM ();
 773   fp = sp - nargs + 1;
 774   ASSERT (SCM_FRAME_RETURN_ADDRESS (fp) == 0);
 775   ASSERT (SCM_FRAME_MV_RETURN_ADDRESS (fp) == 0);
 776   SCM_FRAME_SET_RETURN_ADDRESS (fp, ip);
 777   SCM_FRAME_SET_MV_RETURN_ADDRESS (fp, 0);
 778   ip = SCM_C_OBJCODE_BASE (bp);
 779   ENTER_HOOK ();
 780   APPLY_HOOK ();
 781   NEXT;
 782 }
 783
 784 VM_DEFINE_INSTRUCTION (55, tail_call, "tail-call", 1, -1, 1)
 785 {
 786   nargs = FETCH ();
 787
 788  vm_tail_call:
 789   program = sp[-nargs];
 790
 791   VM_HANDLE_INTERRUPTS;
 792
 793   if (SCM_UNLIKELY (!SCM_PROGRAM_P (program)))
 794     {
 795       if (SCM_STRUCTP (program) && SCM_STRUCT_APPLICABLE_P (program))
 796         {
 797           sp[-nargs] = SCM_STRUCT_PROCEDURE (program);
 798           goto vm_tail_call;
 799         }
 800       else if (SCM_NIMP (program) && SCM_TYP7 (program) == scm_tc7_smob
 801                && SCM_SMOB_APPLICABLE_P (program))
 802         {
 803           SYNC_REGISTER ();
 804           sp[-nargs] = scm_i_smob_apply_trampoline (program);
 805           goto vm_tail_call;
 806         }
 807       else
 808         goto vm_error_wrong_type_apply;
 809     }
 810   else
 811     {
 812       int i;
 813 #ifdef VM_ENABLE_STACK_NULLING
 814       SCM *old_sp = sp;
 815       CHECK_STACK_LEAK ();
 816 #endif
 817
 818       EXIT_HOOK ();
 819
 820       /* switch programs */
 821       CACHE_PROGRAM ();
 822       /* shuffle down the program and the arguments */
 823       for (i = -1, sp = sp - nargs + 1; i < nargs; i++)
 824         SCM_FRAME_STACK_ADDRESS (fp)[i] = sp[i];
 825
 826       sp = fp + i - 1;
 827
 828       NULLSTACK (old_sp - sp);
 829
 830       ip = SCM_C_OBJCODE_BASE (bp);
 831
 832       ENTER_HOOK ();
 833       APPLY_HOOK ();
 834       NEXT;
 835     }
 836 }
 837
 838 VM_DEFINE_INSTRUCTION (56, subr_call, "subr-call", 1, -1, -1)
 839 {
 840   SCM foreign, ret;
 841   SCM (*subr)();
 842   nargs = FETCH ();
 843   POP (foreign);
 844
 845   subr = SCM_FOREIGN_POINTER (foreign, void);
 846
 847   VM_HANDLE_INTERRUPTS;
 848   SYNC_REGISTER ();
 849
 850   switch (nargs)
 851     {
 852     case 0:
 853       ret = subr ();
 854       break;
 855     case 1:
 856       ret = subr (sp[0]);
 857       break;
 858     case 2:
 859       ret = subr (sp[-1], sp[0]);
 860       break;
 861     case 3:
 862       ret = subr (sp[-2], sp[-1], sp[0]);
 863       break;
 864     case 4:
 865       ret = subr (sp[-3], sp[-2], sp[-1], sp[0]);
 866       break;
 867     case 5:
 868       ret = subr (sp[-4], sp[-3], sp[-2], sp[-1], sp[0]);
 869       break;
 870     case 6:
 871       ret = subr (sp[-5], sp[-4], sp[-3], sp[-2], sp[-1], sp[0]);
 872       break;
 873     case 7:
 874       ret = subr (sp[-6], sp[-5], sp[-4], sp[-3], sp[-2], sp[-1], sp[0]);
 875       break;
 876     case 8:
 877       ret = subr (sp[-7], sp[-6], sp[-5], sp[-4], sp[-3], sp[-2], sp[-1], sp[0]);
 878       break;
 879     case 9:
 880       ret = subr (sp[-8], sp[-7], sp[-6], sp[-5], sp[-4], sp[-3], sp[-2], sp[-1], sp[0]);
 881       break;
 882     case 10:
 883       ret = subr (sp[-9], sp[-8], sp[-7], sp[-6], sp[-5], sp[-4], sp[-3], sp[-2], sp[-1], sp[0]);
 884       break;
 885     default:
 886       abort ();
 887     }
 888
 889   NULLSTACK_FOR_NONLOCAL_EXIT ();
 890
 891   if (SCM_UNLIKELY (SCM_VALUESP (ret)))
 892     {
 893       /* multiple values returned to continuation */
 894       ret = scm_struct_ref (ret, SCM_INUM0);
 895       nvalues = scm_ilength (ret);
 896       PUSH_LIST (ret, scm_is_null);
 897       goto vm_return_values;
 898     }
 899   else
 900     {
 901       PUSH (ret);
 902       goto vm_return;
 903     }
 904 }
 905
 906 VM_DEFINE_INSTRUCTION (57, smob_call, "smob-call", 1, -1, -1)
 907 {
 908   SCM smob, ret;
 909   SCM (*subr)();
 910   nargs = FETCH ();
 911   POP (smob);
 912
 913   subr = SCM_SMOB_DESCRIPTOR (smob).apply;
 914
 915   VM_HANDLE_INTERRUPTS;
 916   SYNC_REGISTER ();
 917
 918   switch (nargs)
 919     {
 920     case 0:
 921       ret = subr (smob);
 922       break;
 923     case 1:
 924       ret = subr (smob, sp[0]);
 925       break;
 926     case 2:
 927       ret = subr (smob, sp[-1], sp[0]);
 928       break;
 929     case 3:
 930       ret = subr (smob, sp[-2], sp[-1], sp[0]);
 931       break;
 932     default:
 933       abort ();
 934     }
 935
 936   NULLSTACK_FOR_NONLOCAL_EXIT ();
 937
 938   if (SCM_UNLIKELY (SCM_VALUESP (ret)))
 939     {
 940       /* multiple values returned to continuation */
 941       ret = scm_struct_ref (ret, SCM_INUM0);
 942       nvalues = scm_ilength (ret);
 943       PUSH_LIST (ret, scm_is_null);
 944       goto vm_return_values;
 945     }
 946   else
 947     {
 948       PUSH (ret);
 949       goto vm_return;
 950     }
 951 }
 952
 953 VM_DEFINE_INSTRUCTION (58, foreign_call, "foreign-call", 1, -1, -1)
 954 {
 955   SCM foreign, ret;
 956   nargs = FETCH ();
 957   POP (foreign);
 958
 959   VM_HANDLE_INTERRUPTS;
 960   SYNC_REGISTER ();
 961
 962   ret = scm_i_foreign_call (foreign, sp - nargs + 1);
 963
 964   NULLSTACK_FOR_NONLOCAL_EXIT ();
 965
 966   if (SCM_UNLIKELY (SCM_VALUESP (ret)))
 967     {
 968       /* multiple values returned to continuation */
 969       ret = scm_struct_ref (ret, SCM_INUM0);
 970       nvalues = scm_ilength (ret);
 971       PUSH_LIST (ret, scm_is_null);
 972       goto vm_return_values;
 973     }
 974   else
 975     {
 976       PUSH (ret);
 977       goto vm_return;
 978     }
 979 }
 980
 981 VM_DEFINE_INSTRUCTION (59, tail_call_nargs, "tail-call/nargs", 0, 0, 1)
 982 {
 983   SCM x;
 984   POP (x);
 985   nargs = scm_to_int (x);
 986   /* FIXME: should truncate values? */
 987   goto vm_tail_call;
 988 }
 989
 990 VM_DEFINE_INSTRUCTION (60, call_nargs, "call/nargs", 0, 0, 1)
 991 {
 992   SCM x;
 993   POP (x);
 994   nargs = scm_to_int (x);
 995   /* FIXME: should truncate values? */
 996   goto vm_call;
 997 }
 998
 999 VM_DEFINE_INSTRUCTION (61, mv_call, "mv-call", 4, -1, 1)
1000 {
1001   scm_t_int32 offset;
1002   scm_t_uint8 *mvra;
1003
1004   nargs = FETCH ();
1005   FETCH_OFFSET (offset);
1006   mvra = ip + offset;
1007
1008  vm_mv_call:
1009   program = sp[-nargs];
1010
1011   VM_HANDLE_INTERRUPTS;
1012
1013   if (SCM_UNLIKELY (!SCM_PROGRAM_P (program)))
1014     {
1015       if (SCM_STRUCTP (program) && SCM_STRUCT_APPLICABLE_P (program))
1016         {
1017           sp[-nargs] = SCM_STRUCT_PROCEDURE (program);
1018           goto vm_mv_call;
1019         }
1020       else if (SCM_NIMP (program) && SCM_TYP7 (program) == scm_tc7_smob
1021                && SCM_SMOB_APPLICABLE_P (program))
1022         {
1023           SYNC_REGISTER ();
1024           sp[-nargs] = scm_i_smob_apply_trampoline (program);
1025           goto vm_mv_call;
1026         }
1027       else
1028         goto vm_error_wrong_type_apply;
1029     }
1030
1031   CACHE_PROGRAM ();
1032   fp = sp - nargs + 1;
1033   ASSERT (SCM_FRAME_RETURN_ADDRESS (fp) == 0);
1034   ASSERT (SCM_FRAME_MV_RETURN_ADDRESS (fp) == 0);
1035   SCM_FRAME_SET_RETURN_ADDRESS (fp, ip);
1036   SCM_FRAME_SET_MV_RETURN_ADDRESS (fp, mvra);
1037   ip = SCM_C_OBJCODE_BASE (bp);
1038   ENTER_HOOK ();
1039   APPLY_HOOK ();
1040   NEXT;
1041 }
1042
1043 VM_DEFINE_INSTRUCTION (62, apply, "apply", 1, -1, 1)
1044 {
1045   int len;
1046   SCM ls;
1047   POP (ls);
1048
1049   nargs = FETCH ();
1050   ASSERT (nargs >= 2);
1051
1052   len = scm_ilength (ls);
1053   if (len < 0)
1054     goto vm_error_wrong_type_arg;
1055
1056   PUSH_LIST (ls, SCM_NULL_OR_NIL_P);
1057
1058   nargs += len - 2;
1059   goto vm_call;
1060 }
1061
1062 VM_DEFINE_INSTRUCTION (63, tail_apply, "tail-apply", 1, -1, 1)
1063 {
1064   int len;
1065   SCM ls;
1066   POP (ls);
1067
1068   nargs = FETCH ();
1069   ASSERT (nargs >= 2);
1070
1071   len = scm_ilength (ls);
1072   if (len < 0)
1073     goto vm_error_wrong_type_arg;
1074
1075   PUSH_LIST (ls, SCM_NULL_OR_NIL_P);
1076
1077   nargs += len - 2;
1078   goto vm_tail_call;
1079 }
1080
1081 VM_DEFINE_INSTRUCTION (64, call_cc, "call/cc", 0, 1, 1)
1082 {
1083   int first;
1084   SCM proc, cont;
1085   POP (proc);
1086   SYNC_ALL ();
1087   cont = scm_make_continuation (&first);
1088   if (first)
1089     {
1090       PUSH ((SCM)fp); /* dynamic link */
1091       PUSH (0);  /* mvra */
1092       PUSH (0);  /* ra */
1093       PUSH (proc);
1094       PUSH (cont);
1095       nargs = 1;
1096       goto vm_call;
1097     }
1098   ASSERT (sp == vp->sp);
1099   ASSERT (fp == vp->fp);
1100   else if (SCM_VALUESP (cont))
1101     {
1102       /* multiple values returned to continuation */
1103       SCM values;
1104       values = scm_struct_ref (cont, SCM_INUM0);
1105       if (scm_is_null (values))
1106         goto vm_error_no_values;
1107       /* non-tail context does not accept multiple values? */
1108       PUSH (SCM_CAR (values));
1109       NEXT;
1110     }
1111   else
1112     {
1113       PUSH (cont);
1114       NEXT;
1115     }
1116 }
1117
1118 VM_DEFINE_INSTRUCTION (65, tail_call_cc, "tail-call/cc", 0, 1, 1)
1119 {
1120   int first;
1121   SCM proc, cont;
1122   POP (proc);
1123   SYNC_ALL ();
1124   cont = scm_make_continuation (&first);
1125   ASSERT (sp == vp->sp);
1126   ASSERT (fp == vp->fp);
1127   if (first)
1128     {
1129       PUSH (proc);
1130       PUSH (cont);
1131       nargs = 1;
1132       goto vm_tail_call;
1133     }
1134   else if (SCM_VALUESP (cont))
1135     {
1136       /* multiple values returned to continuation */
1137       SCM values;
1138       values = scm_struct_ref (cont, SCM_INUM0);
1139       nvalues = scm_ilength (values);
1140       PUSH_LIST (values, scm_is_null);
1141       goto vm_return_values;
1142     }
1143   else
1144     {
1145       PUSH (cont);
1146       goto vm_return;
1147     }
1148 }
1149
1150 VM_DEFINE_INSTRUCTION (66, return, "return", 0, 1, 1)
1151 {
1152  vm_return:
1153   EXIT_HOOK ();
1154   RETURN_HOOK (1);
1155
1156   VM_HANDLE_INTERRUPTS;
1157
1158   {
1159     SCM ret;
1160
1161     POP (ret);
1162
1163 #ifdef VM_ENABLE_STACK_NULLING
1164     SCM *old_sp = sp;
1165 #endif
1166
1167     /* Restore registers */
1168     sp = SCM_FRAME_LOWER_ADDRESS (fp);
1169     ip = SCM_FRAME_RETURN_ADDRESS (fp);
1170     fp = SCM_FRAME_DYNAMIC_LINK (fp);
1171
1172 #ifdef VM_ENABLE_STACK_NULLING
1173     NULLSTACK (old_sp - sp);
1174 #endif
1175
1176     /* Set return value (sp is already pushed) */
1177     *sp = ret;
1178   }
1179
1180   /* Restore the last program */
1181   program = SCM_FRAME_PROGRAM (fp);
1182   CACHE_PROGRAM ();
1183   CHECK_IP ();
1184   NEXT;
1185 }
1186
1187 VM_DEFINE_INSTRUCTION (67, return_values, "return/values", 1, -1, -1)
1188 {
1189   /* nvalues declared at top level, because for some reason gcc seems to think
1190      that perhaps it might be used without declaration. Fooey to that, I say. */
1191   nvalues = FETCH ();
1192  vm_return_values:
1193   EXIT_HOOK ();
1194   RETURN_HOOK (nvalues);
1195
1196   VM_HANDLE_INTERRUPTS;
1197
1198   if (nvalues != 1 && SCM_FRAME_MV_RETURN_ADDRESS (fp))
1199     {
1200       /* A multiply-valued continuation */
1201       SCM *vals = sp - nvalues;
1202       int i;
1203       /* Restore registers */
1204       sp = SCM_FRAME_LOWER_ADDRESS (fp) - 1;
1205       ip = SCM_FRAME_MV_RETURN_ADDRESS (fp);
1206       fp = SCM_FRAME_DYNAMIC_LINK (fp);
1207
1208       /* Push return values, and the number of values */
1209       for (i = 0; i < nvalues; i++)
1210         *++sp = vals[i+1];
1211       *++sp = SCM_I_MAKINUM (nvalues);
1212
1213       /* Finally null the end of the stack */
1214       NULLSTACK (vals + nvalues - sp);
1215     }
1216   else if (nvalues >= 1)
1217     {
1218       /* Multiple values for a single-valued continuation -- here's where I
1219          break with guile tradition and try and do something sensible. (Also,
1220          this block handles the single-valued return to an mv
1221          continuation.) */
1222       SCM *vals = sp - nvalues;
1223       /* Restore registers */
1224       sp = SCM_FRAME_LOWER_ADDRESS (fp) - 1;
1225       ip = SCM_FRAME_RETURN_ADDRESS (fp);
1226       fp = SCM_FRAME_DYNAMIC_LINK (fp);
1227
1228       /* Push first value */
1229       *++sp = vals[1];
1230
1231       /* Finally null the end of the stack */
1232       NULLSTACK (vals + nvalues - sp);
1233     }
1234   else
1235     goto vm_error_no_values;
1236
1237   /* Restore the last program */
1238   program = SCM_FRAME_PROGRAM (fp);
1239   CACHE_PROGRAM ();
1240   CHECK_IP ();
1241   NEXT;
1242 }
1243
1244 VM_DEFINE_INSTRUCTION (68, return_values_star, "return/values*", 1, -1, -1)
1245 {
1246   SCM l;
1247
1248   nvalues = FETCH ();
1249   ASSERT (nvalues >= 1);
1250
1251   nvalues--;
1252   POP (l);
1253   while (scm_is_pair (l))
1254     {
1255       PUSH (SCM_CAR (l));
1256       l = SCM_CDR (l);
1257       nvalues++;
1258     }
1259   if (SCM_UNLIKELY (!SCM_NULL_OR_NIL_P (l))) {
1260     finish_args = scm_list_1 (l);
1261     goto vm_error_improper_list;
1262   }
1263
1264   goto vm_return_values;
1265 }
1266
1267 VM_DEFINE_INSTRUCTION (88, return_nvalues, "return/nvalues", 0, 1, -1)
1268 {
1269   SCM n;
1270   POP (n);
1271   nvalues = scm_to_int (n);
1272   ASSERT (nvalues >= 0);
1273   goto vm_return_values;
1274 }
1275
1276 VM_DEFINE_INSTRUCTION (69, truncate_values, "truncate-values", 2, -1, -1)
1277 {
1278   SCM x;
1279   int nbinds, rest;
1280   POP (x);
1281   nvalues = scm_to_int (x);
1282   nbinds = FETCH ();
1283   rest = FETCH ();
1284
1285   if (rest)
1286     nbinds--;
1287
1288   if (nvalues < nbinds)
1289     goto vm_error_not_enough_values;
1290
1291   if (rest)
1292     POP_LIST (nvalues - nbinds);
1293   else
1294     DROPN (nvalues - nbinds);
1295
1296   NEXT;
1297 }
1298
1299 VM_DEFINE_INSTRUCTION (70, box, "box", 1, 1, 0)
1300 {
1301   SCM val;
1302   POP (val);
1303   SYNC_BEFORE_GC ();
1304   LOCAL_SET (FETCH (), scm_cell (scm_tc7_variable, SCM_UNPACK (val)));
1305   NEXT;
1306 }
1307
1308 /* for letrec:
1309    (let ((a *undef*) (b *undef*) ...)
1310      (set! a (lambda () (b ...)))
1311      ...)
1312  */
1313 VM_DEFINE_INSTRUCTION (71, empty_box, "empty-box", 1, 0, 0)
1314 {
1315   SYNC_BEFORE_GC ();
1316   LOCAL_SET (FETCH (),
1317              scm_cell (scm_tc7_variable, SCM_UNPACK (SCM_UNDEFINED)));
1318   NEXT;
1319 }
1320
1321 VM_DEFINE_INSTRUCTION (72, local_boxed_ref, "local-boxed-ref", 1, 0, 1)
1322 {
1323   SCM v = LOCAL_REF (FETCH ());
1324   ASSERT_BOUND_VARIABLE (v);
1325   PUSH (VARIABLE_REF (v));
1326   NEXT;
1327 }
1328
1329 VM_DEFINE_INSTRUCTION (73, local_boxed_set, "local-boxed-set", 1, 1, 0)
1330 {
1331   SCM v, val;
1332   v = LOCAL_REF (FETCH ());
1333   POP (val);
1334   ASSERT_VARIABLE (v);
1335   VARIABLE_SET (v, val);
1336   NEXT;
1337 }
1338
1339 VM_DEFINE_INSTRUCTION (74, free_ref, "free-ref", 1, 0, 1)
1340 {
1341   scm_t_uint8 idx = FETCH ();
1342
1343   CHECK_FREE_VARIABLE (idx);
1344   PUSH (FREE_VARIABLE_REF (idx));
1345   NEXT;
1346 }
1347
1348 /* no free-set -- if a var is assigned, it should be in a box */
1349
1350 VM_DEFINE_INSTRUCTION (75, free_boxed_ref, "free-boxed-ref", 1, 0, 1)
1351 {
1352   SCM v;
1353   scm_t_uint8 idx = FETCH ();
1354   CHECK_FREE_VARIABLE (idx);
1355   v = FREE_VARIABLE_REF (idx);
1356   ASSERT_BOUND_VARIABLE (v);
1357   PUSH (VARIABLE_REF (v));
1358   NEXT;
1359 }
1360
1361 VM_DEFINE_INSTRUCTION (76, free_boxed_set, "free-boxed-set", 1, 1, 0)
1362 {
1363   SCM v, val;
1364   scm_t_uint8 idx = FETCH ();
1365   POP (val);
1366   CHECK_FREE_VARIABLE (idx);
1367   v = FREE_VARIABLE_REF (idx);
1368   ASSERT_BOUND_VARIABLE (v);
1369   VARIABLE_SET (v, val);
1370   NEXT;
1371 }
1372
1373 VM_DEFINE_INSTRUCTION (77, make_closure, "make-closure", 2, -1, 1)
1374 {
1375   size_t n, len;
1376   SCM closure;
1377
1378   len = FETCH ();
1379   len <<= 8;
1380   len += FETCH ();
1381   SYNC_BEFORE_GC ();
1382   closure = scm_words (scm_tc7_program | (len<<16), len + 3);
1383   SCM_SET_CELL_OBJECT_1 (closure, SCM_PROGRAM_OBJCODE (sp[-len]));
1384   SCM_SET_CELL_OBJECT_2 (closure, SCM_PROGRAM_OBJTABLE (sp[-len]));
1385   sp[-len] = closure;
1386   for (n = 0; n < len; n++)
1387     SCM_PROGRAM_FREE_VARIABLE_SET (closure, n, sp[-len + 1 + n]);
1388   DROPN (len);
1389   NEXT;
1390 }
1391
1392 VM_DEFINE_INSTRUCTION (78, make_variable, "make-variable", 0, 0, 1)
1393 {
1394   SYNC_BEFORE_GC ();
1395   /* fixme underflow */
1396   PUSH (scm_cell (scm_tc7_variable, SCM_UNPACK (SCM_UNDEFINED)));
1397   NEXT;
1398 }
1399
1400 VM_DEFINE_INSTRUCTION (79, fix_closure, "fix-closure", 2, -1, 0)
1401 {
1402   SCM x;
1403   unsigned int i = FETCH ();
1404   size_t n, len;
1405   i <<= 8;
1406   i += FETCH ();
1407   /* FIXME CHECK_LOCAL (i) */
1408   x = LOCAL_REF (i);
1409   /* FIXME ASSERT_PROGRAM (x); */
1410   len = SCM_PROGRAM_NUM_FREE_VARIABLES (x);
1411   for (n = 0; n < len; n++)
1412     SCM_PROGRAM_FREE_VARIABLE_SET (x, n, sp[-len + 1 + n]);
1413   DROPN (len);
1414   NEXT;
1415 }
1416
1417 VM_DEFINE_INSTRUCTION (80, define, "define", 0, 0, 2)
1418 {
1419   SCM sym, val;
1420   POP (sym);
1421   POP (val);
1422   SYNC_REGISTER ();
1423   VARIABLE_SET (scm_sym2var (sym, scm_current_module_lookup_closure (),
1424                              SCM_BOOL_T),
1425                 val);
1426   NEXT;
1427 }
1428
1429 VM_DEFINE_INSTRUCTION (81, make_keyword, "make-keyword", 0, 1, 1)
1430 {
1431   CHECK_UNDERFLOW ();
1432   SYNC_REGISTER ();
1433   *sp = scm_symbol_to_keyword (*sp);
1434   NEXT;
1435 }
1436
1437 VM_DEFINE_INSTRUCTION (82, make_symbol, "make-symbol", 0, 1, 1)
1438 {
1439   CHECK_UNDERFLOW ();
1440   SYNC_REGISTER ();
1441   *sp = scm_string_to_symbol (*sp);
1442   NEXT;
1443 }
1444
1445 VM_DEFINE_INSTRUCTION (83, prompt, "prompt", 5, 3, 0)
1446 {
1447   scm_t_int32 offset;
1448   scm_t_uint8 inline_handler_p, escape_only_p;
1449   SCM k, handler, pre_unwind, prompt;
1450
1451   inline_handler_p = FETCH ();
1452   escape_only_p = FETCH ();
1453   FETCH_OFFSET (offset);
1454   POP (pre_unwind);
1455   POP (handler);
1456   POP (k);
1457
1458   SYNC_REGISTER ();
1459   /* Push the prompt onto the dynamic stack. The setjmp itself has to be local
1460      to this procedure. */
1461   /* FIXME: do more error checking */
1462   prompt = scm_c_make_prompt (vm, k, handler, pre_unwind,
1463                               inline_handler_p, escape_only_p);
1464   scm_i_set_dynwinds (scm_cons (prompt, scm_i_dynwinds ()));
1465   if (SCM_PROMPT_SETJMP (prompt))
1466     {
1467       /* The prompt exited nonlocally. Cache the regs back from the vp, and go
1468          to the handler or post-handler label. (The meaning of the label differs
1469          depending on whether the prompt's handler is rendered inline or not.)
1470          */
1471       CACHE_REGISTER (); /* Really we only need SP. FP and IP should be
1472                             unmodified. */
1473       ip += offset;
1474       NEXT;
1475     }
1476
1477   /* Otherwise setjmp returned for the first time, so we go to execute the
1478      prompt's body. */
1479   NEXT;
1480 }
1481
1482 VM_DEFINE_INSTRUCTION (85, wind, "wind", 0, 2, 0)
1483 {
1484   SCM wind, unwind;
1485   POP (unwind);
1486   POP (wind);
1487   SYNC_REGISTER ();
1488   /* Push wind and unwind procedures onto the dynamic stack. Note that neither
1489      are actually called; the compiler should emit calls to wind and unwind for
1490      the normal dynamic-wind control flow. */
1491   if (SCM_UNLIKELY (scm_is_false (scm_thunk_p (wind))))
1492     {
1493       finish_args = wind;
1494       goto vm_error_not_a_thunk;
1495     }
1496   if (SCM_UNLIKELY (scm_is_false (scm_thunk_p (unwind))))
1497     {
1498       finish_args = unwind;
1499       goto vm_error_not_a_thunk;
1500     }
1501   scm_i_set_dynwinds (scm_cons (scm_cons (wind, unwind), scm_i_dynwinds ()));
1502   NEXT;
1503 }
1504
1505 VM_DEFINE_INSTRUCTION (86, throw, "throw", 1, -1, -1)
1506 {
1507   unsigned n = FETCH ();
1508   SCM k;
1509   SCM args;
1510   POP_LIST (n);
1511   POP (args);
1512   POP (k);
1513   SYNC_REGISTER ();
1514   vm_throw (vm, k, args);
1515   /* vm_throw should not return */
1516   abort ();
1517 }
1518
1519 VM_DEFINE_INSTRUCTION (87, unwind, "unwind", 0, 0, 0)
1520 {
1521   /* A normal exit from the dynamic extent of an expression. Pop the top entry
1522      off of the dynamic stack. */
1523   scm_i_set_dynwinds (scm_cdr (scm_i_dynwinds ()));
1524   NEXT;
1525 }
1526
1527
1528
1529 /*
1530 (defun renumber-ops ()
1531   "start from top of buffer and renumber 'VM_DEFINE_FOO (\n' sequences"
1532   (interactive "")
1533   (save-excursion
1534     (let ((counter -1)) (goto-char (point-min))
1535       (while (re-search-forward "^VM_DEFINE_[^ ]+ (\\([^,]+\\)," (point-max) t)
1536         (replace-match
1537          (number-to-string (setq counter (1+ counter)))
1538           t t nil 1)))))
1539 (renumber-ops)
1540 */
1541 /*
1542   Local Variables:
1543   c-file-style: "gnu"
1544   End:
1545 */