libguile/vm-i-system.c

   1 /* Copyright (C) 2001,2008,2009 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   vp->time += scm_c_get_internal_run_time () - start_time;
  35   HALT_HOOK ();
  36   nvalues = SCM_I_INUM (*sp--);
  37   NULLSTACK (1);
  38   if (nvalues == 1)
  39     POP (finish_args);
  40   else
  41     {
  42       POP_LIST (nvalues);
  43       POP (finish_args);
  44       SYNC_REGISTER ();
  45       finish_args = scm_values (finish_args);
  46     }
  47
  48   {
  49 #ifdef VM_ENABLE_STACK_NULLING
  50     SCM *old_sp = sp;
  51 #endif
  52
  53     /* Restore registers */
  54     sp = SCM_FRAME_LOWER_ADDRESS (fp) - 1;
  55     /* Setting the ip here doesn't actually affect control flow, as the calling
  56        code will restore its own registers, but it does help when walking the
  57        stack */
  58     ip = SCM_FRAME_RETURN_ADDRESS (fp);
  59     fp = SCM_FRAME_DYNAMIC_LINK (fp);
  60     NULLSTACK (old_sp - sp);
  61   }
  62
  63   goto vm_done;
  64 }
  65
  66 VM_DEFINE_INSTRUCTION (2, break, "break", 0, 0, 0)
  67 {
  68   BREAK_HOOK ();
  69   NEXT;
  70 }
  71
  72 VM_DEFINE_INSTRUCTION (3, drop, "drop", 0, 1, 0)
  73 {
  74   DROP ();
  75   NEXT;
  76 }
  77
  78 VM_DEFINE_INSTRUCTION (4, dup, "dup", 0, 0, 1)
  79 {
  80   SCM x = *sp;
  81   PUSH (x);
  82   NEXT;
  83 }
  84
  85 \f
  86 /*
  87  * Object creation
  88  */
  89
  90 VM_DEFINE_INSTRUCTION (5, void, "void", 0, 0, 1)
  91 {
  92   PUSH (SCM_UNSPECIFIED);
  93   NEXT;
  94 }
  95
  96 VM_DEFINE_INSTRUCTION (6, make_true, "make-true", 0, 0, 1)
  97 {
  98   PUSH (SCM_BOOL_T);
  99   NEXT;
 100 }
 101
 102 VM_DEFINE_INSTRUCTION (7, make_false, "make-false", 0, 0, 1)
 103 {
 104   PUSH (SCM_BOOL_F);
 105   NEXT;
 106 }
 107
 108 VM_DEFINE_INSTRUCTION (8, make_eol, "make-eol", 0, 0, 1)
 109 {
 110   PUSH (SCM_EOL);
 111   NEXT;
 112 }
 113
 114 VM_DEFINE_INSTRUCTION (9, make_int8, "make-int8", 1, 0, 1)
 115 {
 116   PUSH (SCM_I_MAKINUM ((signed char) FETCH ()));
 117   NEXT;
 118 }
 119
 120 VM_DEFINE_INSTRUCTION (10, make_int8_0, "make-int8:0", 0, 0, 1)
 121 {
 122   PUSH (SCM_INUM0);
 123   NEXT;
 124 }
 125
 126 VM_DEFINE_INSTRUCTION (11, make_int8_1, "make-int8:1", 0, 0, 1)
 127 {
 128   PUSH (SCM_I_MAKINUM (1));
 129   NEXT;
 130 }
 131
 132 VM_DEFINE_INSTRUCTION (12, make_int16, "make-int16", 2, 0, 1)
 133 {
 134   int h = FETCH ();
 135   int l = FETCH ();
 136   PUSH (SCM_I_MAKINUM ((signed short) (h << 8) + l));
 137   NEXT;
 138 }
 139
 140 VM_DEFINE_INSTRUCTION (13, make_int64, "make-int64", 8, 0, 1)
 141 {
 142   scm_t_uint64 v = 0;
 143   v += FETCH ();
 144   v <<= 8; v += FETCH ();
 145   v <<= 8; v += FETCH ();
 146   v <<= 8; v += FETCH ();
 147   v <<= 8; v += FETCH ();
 148   v <<= 8; v += FETCH ();
 149   v <<= 8; v += FETCH ();
 150   v <<= 8; v += FETCH ();
 151   PUSH (scm_from_int64 ((scm_t_int64) v));
 152   NEXT;
 153 }
 154
 155 VM_DEFINE_INSTRUCTION (14, make_uint64, "make-uint64", 8, 0, 1)
 156 {
 157   scm_t_uint64 v = 0;
 158   v += FETCH ();
 159   v <<= 8; v += FETCH ();
 160   v <<= 8; v += FETCH ();
 161   v <<= 8; v += FETCH ();
 162   v <<= 8; v += FETCH ();
 163   v <<= 8; v += FETCH ();
 164   v <<= 8; v += FETCH ();
 165   v <<= 8; v += FETCH ();
 166   PUSH (scm_from_uint64 (v));
 167   NEXT;
 168 }
 169
 170 VM_DEFINE_INSTRUCTION (15, make_char8, "make-char8", 1, 0, 1)
 171 {
 172   scm_t_uint8 v = 0;
 173   v = FETCH ();
 174
 175   PUSH (SCM_MAKE_CHAR (v));
 176   /* Don't simplify this to PUSH (SCM_MAKE_CHAR (FETCH ())).  The
 177      contents of SCM_MAKE_CHAR may be evaluated more than once,
 178      resulting in a double fetch.  */
 179   NEXT;
 180 }
 181
 182 VM_DEFINE_INSTRUCTION (16, make_char32, "make-char32", 4, 0, 1)
 183 {
 184   scm_t_wchar v = 0;
 185   v += FETCH ();
 186   v <<= 8; v += FETCH ();
 187   v <<= 8; v += FETCH ();
 188   v <<= 8; v += FETCH ();
 189   PUSH (SCM_MAKE_CHAR (v));
 190   NEXT;
 191 }
 192
 193
 194
 195 VM_DEFINE_INSTRUCTION (17, list, "list", 2, -1, 1)
 196 {
 197   unsigned h = FETCH ();
 198   unsigned l = FETCH ();
 199   unsigned len = ((h << 8) + l);
 200   POP_LIST (len);
 201   NEXT;
 202 }
 203
 204 VM_DEFINE_INSTRUCTION (18, vector, "vector", 2, -1, 1)
 205 {
 206   unsigned h = FETCH ();
 207   unsigned l = FETCH ();
 208   unsigned len = ((h << 8) + l);
 209   SCM vect;
 210
 211   SYNC_REGISTER ();
 212   sp++; sp -= len;
 213   CHECK_UNDERFLOW ();
 214   vect = scm_make_vector (scm_from_uint (len), SCM_BOOL_F);
 215   memcpy (SCM_I_VECTOR_WELTS(vect), sp, sizeof(SCM) * len);
 216   NULLSTACK (len);
 217   *sp = vect;
 218
 219   NEXT;
 220 }
 221
 222 \f
 223 /*
 224  * Variable access
 225  */
 226
 227 #define OBJECT_REF(i)           objects[i]
 228 #define OBJECT_SET(i,o)         objects[i] = o
 229
 230 #define LOCAL_REF(i)            SCM_FRAME_VARIABLE (fp, i)
 231 #define LOCAL_SET(i,o)          SCM_FRAME_VARIABLE (fp, i) = o
 232
 233 /* For the variable operations, we _must_ obviously avoid function calls to
 234    `scm_variable_ref ()', `scm_variable_bound_p ()' and friends which do
 235    nothing more than the corresponding macros.  */
 236 #define VARIABLE_REF(v)         SCM_VARIABLE_REF (v)
 237 #define VARIABLE_SET(v,o)       SCM_VARIABLE_SET (v, o)
 238 #define VARIABLE_BOUNDP(v)      (VARIABLE_REF (v) != SCM_UNDEFINED)
 239
 240 #define FREE_VARIABLE_REF(i)    free_vars[i]
 241
 242 /* ref */
 243
 244 VM_DEFINE_INSTRUCTION (19, object_ref, "object-ref", 1, 0, 1)
 245 {
 246   register unsigned objnum = FETCH ();
 247   CHECK_OBJECT (objnum);
 248   PUSH (OBJECT_REF (objnum));
 249   NEXT;
 250 }
 251
 252 /* FIXME: necessary? elt 255 of the vector could be a vector... */
 253 VM_DEFINE_INSTRUCTION (20, long_object_ref, "long-object-ref", 2, 0, 1)
 254 {
 255   unsigned int objnum = FETCH ();
 256   objnum <<= 8;
 257   objnum += FETCH ();
 258   CHECK_OBJECT (objnum);
 259   PUSH (OBJECT_REF (objnum));
 260   NEXT;
 261 }
 262
 263 VM_DEFINE_INSTRUCTION (21, local_ref, "local-ref", 1, 0, 1)
 264 {
 265   PUSH (LOCAL_REF (FETCH ()));
 266   ASSERT_BOUND (*sp);
 267   NEXT;
 268 }
 269
 270 VM_DEFINE_INSTRUCTION (22, long_local_ref, "long-local-ref", 2, 0, 1)
 271 {
 272   unsigned int i = FETCH ();
 273   i <<= 8;
 274   i += FETCH ();
 275   PUSH (LOCAL_REF (i));
 276   ASSERT_BOUND (*sp);
 277   NEXT;
 278 }
 279
 280 VM_DEFINE_INSTRUCTION (23, variable_ref, "variable-ref", 0, 0, 1)
 281 {
 282   SCM x = *sp;
 283
 284   if (!VARIABLE_BOUNDP (x))
 285     {
 286       finish_args = scm_list_1 (x);
 287       /* Was: finish_args = SCM_LIST1 (SCM_CAR (x)); */
 288       goto vm_error_unbound;
 289     }
 290   else
 291     {
 292       SCM o = VARIABLE_REF (x);
 293       *sp = o;
 294     }
 295
 296   NEXT;
 297 }
 298
 299 VM_DEFINE_INSTRUCTION (24, toplevel_ref, "toplevel-ref", 1, 0, 1)
 300 {
 301   unsigned objnum = FETCH ();
 302   SCM what;
 303   CHECK_OBJECT (objnum);
 304   what = OBJECT_REF (objnum);
 305
 306   if (!SCM_VARIABLEP (what))
 307     {
 308       SYNC_REGISTER ();
 309       what = resolve_variable (what, scm_program_module (program));
 310       if (!VARIABLE_BOUNDP (what))
 311         {
 312           finish_args = scm_list_1 (what);
 313           goto vm_error_unbound;
 314         }
 315       OBJECT_SET (objnum, what);
 316     }
 317
 318   PUSH (VARIABLE_REF (what));
 319   NEXT;
 320 }
 321
 322 VM_DEFINE_INSTRUCTION (25, long_toplevel_ref, "long-toplevel-ref", 2, 0, 1)
 323 {
 324   SCM what;
 325   unsigned int objnum = FETCH ();
 326   objnum <<= 8;
 327   objnum += FETCH ();
 328   CHECK_OBJECT (objnum);
 329   what = OBJECT_REF (objnum);
 330
 331   if (!SCM_VARIABLEP (what))
 332     {
 333       SYNC_REGISTER ();
 334       what = resolve_variable (what, scm_program_module (program));
 335       if (!VARIABLE_BOUNDP (what))
 336         {
 337           finish_args = scm_list_1 (what);
 338           goto vm_error_unbound;
 339         }
 340       OBJECT_SET (objnum, what);
 341     }
 342
 343   PUSH (VARIABLE_REF (what));
 344   NEXT;
 345 }
 346
 347 /* set */
 348
 349 VM_DEFINE_INSTRUCTION (26, local_set, "local-set", 1, 1, 0)
 350 {
 351   LOCAL_SET (FETCH (), *sp);
 352   DROP ();
 353   NEXT;
 354 }
 355
 356 VM_DEFINE_INSTRUCTION (27, long_local_set, "long-local-set", 2, 1, 0)
 357 {
 358   unsigned int i = FETCH ();
 359   i <<= 8;
 360   i += FETCH ();
 361   LOCAL_SET (i, *sp);
 362   DROP ();
 363   NEXT;
 364 }
 365
 366 VM_DEFINE_INSTRUCTION (28, variable_set, "variable-set", 0, 1, 0)
 367 {
 368   VARIABLE_SET (sp[0], sp[-1]);
 369   DROPN (2);
 370   NEXT;
 371 }
 372
 373 VM_DEFINE_INSTRUCTION (29, toplevel_set, "toplevel-set", 1, 1, 0)
 374 {
 375   unsigned objnum = FETCH ();
 376   SCM what;
 377   CHECK_OBJECT (objnum);
 378   what = OBJECT_REF (objnum);
 379
 380   if (!SCM_VARIABLEP (what))
 381     {
 382       SYNC_BEFORE_GC ();
 383       what = resolve_variable (what, scm_program_module (program));
 384       OBJECT_SET (objnum, what);
 385     }
 386
 387   VARIABLE_SET (what, *sp);
 388   DROP ();
 389   NEXT;
 390 }
 391
 392 VM_DEFINE_INSTRUCTION (30, long_toplevel_set, "long-toplevel-set", 2, 1, 0)
 393 {
 394   SCM what;
 395   unsigned int objnum = FETCH ();
 396   objnum <<= 8;
 397   objnum += FETCH ();
 398   CHECK_OBJECT (objnum);
 399   what = OBJECT_REF (objnum);
 400
 401   if (!SCM_VARIABLEP (what))
 402     {
 403       SYNC_BEFORE_GC ();
 404       what = resolve_variable (what, scm_program_module (program));
 405       OBJECT_SET (objnum, what);
 406     }
 407
 408   VARIABLE_SET (what, *sp);
 409   DROP ();
 410   NEXT;
 411 }
 412
 413 \f
 414 /*
 415  * branch and jump
 416  */
 417
 418 /* offset must be at least 24 bits wide, and signed */
 419 #define FETCH_OFFSET(offset)                    \
 420 {                                               \
 421   offset = FETCH () << 16;                      \
 422   offset += FETCH () << 8;                      \
 423   offset += FETCH ();                           \
 424   offset -= (offset & (1<<23)) << 1;            \
 425 }
 426
 427 #define BR(p)                                   \
 428 {                                               \
 429   scm_t_int32 offset;                           \
 430   FETCH_OFFSET (offset);                        \
 431   if (p)                                        \
 432     ip += offset;                               \
 433   NULLSTACK (1);                                \
 434   DROP ();                                      \
 435   NEXT;                                         \
 436 }
 437
 438 VM_DEFINE_INSTRUCTION (31, br, "br", 3, 0, 0)
 439 {
 440   scm_t_int32 offset;
 441   FETCH_OFFSET (offset);
 442   ip += offset;
 443   NEXT;
 444 }
 445
 446 VM_DEFINE_INSTRUCTION (32, br_if, "br-if", 3, 0, 0)
 447 {
 448   BR (!SCM_FALSEP (*sp));
 449 }
 450
 451 VM_DEFINE_INSTRUCTION (33, br_if_not, "br-if-not", 3, 0, 0)
 452 {
 453   BR (SCM_FALSEP (*sp));
 454 }
 455
 456 VM_DEFINE_INSTRUCTION (34, br_if_eq, "br-if-eq", 3, 0, 0)
 457 {
 458   sp--; /* underflow? */
 459   BR (SCM_EQ_P (sp[0], sp[1]));
 460 }
 461
 462 VM_DEFINE_INSTRUCTION (35, br_if_not_eq, "br-if-not-eq", 3, 0, 0)
 463 {
 464   sp--; /* underflow? */
 465   BR (!SCM_EQ_P (sp[0], sp[1]));
 466 }
 467
 468 VM_DEFINE_INSTRUCTION (36, br_if_null, "br-if-null", 3, 0, 0)
 469 {
 470   BR (SCM_NULLP (*sp));
 471 }
 472
 473 VM_DEFINE_INSTRUCTION (37, br_if_not_null, "br-if-not-null", 3, 0, 0)
 474 {
 475   BR (!SCM_NULLP (*sp));
 476 }
 477
 478 \f
 479 /*
 480  * Subprogram call
 481  */
 482
 483 VM_DEFINE_INSTRUCTION (38, assert_nargs_ee, "assert-nargs-ee", 2, 0, 0)
 484 {
 485   scm_t_ptrdiff n;
 486   n = FETCH () << 8;
 487   n += FETCH ();
 488   if (sp - (fp - 1) != n)
 489     goto vm_error_wrong_num_args;
 490   NEXT;
 491 }
 492
 493 VM_DEFINE_INSTRUCTION (39, assert_nargs_ge, "assert-nargs-ge", 2, 0, 0)
 494 {
 495   scm_t_ptrdiff n;
 496   n = FETCH () << 8;
 497   n += FETCH ();
 498   if (sp - (fp - 1) < n)
 499     goto vm_error_wrong_num_args;
 500   NEXT;
 501 }
 502
 503 VM_DEFINE_INSTRUCTION (40, push_rest_list, "push-rest-list", 2, -1, -1)
 504 {
 505   scm_t_ptrdiff n;
 506   SCM rest = SCM_EOL;
 507   n = FETCH () << 8;
 508   n += FETCH ();
 509   while (sp - (fp - 1) > n)
 510     /* No need to check for underflow. */
 511     CONS (rest, *sp--, rest);
 512   PUSH (rest);
 513   NEXT;
 514 }
 515
 516 VM_DEFINE_INSTRUCTION (41, reserve_locals, "reserve-locals", 2, -1, -1)
 517 {
 518   scm_t_int32 n;
 519   n = FETCH () << 8;
 520   n += FETCH ();
 521   sp += n;
 522   CHECK_OVERFLOW ();
 523   while (n--)
 524     sp[-n] = SCM_UNDEFINED;
 525   NEXT;
 526 }
 527
 528 VM_DEFINE_INSTRUCTION (42, new_frame, "new-frame", 0, 0, 3)
 529 {
 530   /* NB: if you change this, see frames.c:vm-frame-num-locals */
 531   /* and frames.h, vm-engine.c, etc of course */
 532   PUSH ((SCM)fp); /* dynamic link */
 533   PUSH (0);  /* mvra */
 534   PUSH (0);  /* ra */
 535   NEXT;
 536 }
 537
 538 VM_DEFINE_INSTRUCTION (43, call, "call", 1, -1, 1)
 539 {
 540   SCM x;
 541   nargs = FETCH ();
 542
 543  vm_call:
 544   x = sp[-nargs];
 545
 546   SYNC_REGISTER ();
 547   SCM_TICK;     /* allow interrupt here */
 548
 549   /*
 550    * Subprogram call
 551    */
 552   if (SCM_PROGRAM_P (x))
 553     {
 554       program = x;
 555       CACHE_PROGRAM ();
 556       fp = sp - nargs + 1;
 557       ASSERT (SCM_FRAME_RETURN_ADDRESS (fp) == 0);
 558       ASSERT (SCM_FRAME_MV_RETURN_ADDRESS (fp) == 0);
 559       SCM_FRAME_SET_RETURN_ADDRESS (fp, ip);
 560       SCM_FRAME_SET_MV_RETURN_ADDRESS (fp, 0);
 561       ip = bp->base;
 562       ENTER_HOOK ();
 563       APPLY_HOOK ();
 564       NEXT;
 565     }
 566   /*
 567    * Other interpreted or compiled call
 568    */
 569   if (!SCM_FALSEP (scm_procedure_p (x)))
 570     {
 571       SCM args;
 572       /* At this point, the stack contains the frame, the procedure and each one
 573          of its arguments. */
 574       POP_LIST (nargs);
 575       POP (args);
 576       DROP (); /* drop the procedure */
 577       DROP_FRAME ();
 578
 579       SYNC_REGISTER ();
 580       PUSH (scm_apply (x, args, SCM_EOL));
 581       NULLSTACK_FOR_NONLOCAL_EXIT ();
 582       if (SCM_UNLIKELY (SCM_VALUESP (*sp)))
 583         {
 584           /* truncate values */
 585           SCM values;
 586           POP (values);
 587           values = scm_struct_ref (values, SCM_INUM0);
 588           if (scm_is_null (values))
 589             goto vm_error_not_enough_values;
 590           PUSH (SCM_CAR (values));
 591         }
 592       NEXT;
 593     }
 594
 595   program = x;
 596   goto vm_error_wrong_type_apply;
 597 }
 598
 599 VM_DEFINE_INSTRUCTION (44, goto_args, "goto/args", 1, -1, 1)
 600 {
 601   register SCM x;
 602   nargs = FETCH ();
 603  vm_goto_args:
 604   x = sp[-nargs];
 605
 606   SYNC_REGISTER ();
 607   SCM_TICK;     /* allow interrupt here */
 608
 609   /*
 610    * Tail call
 611    */
 612   if (SCM_PROGRAM_P (x))
 613     {
 614       int i;
 615 #ifdef VM_ENABLE_STACK_NULLING
 616       SCM *old_sp = sp;
 617       CHECK_STACK_LEAK ();
 618 #endif
 619
 620       EXIT_HOOK ();
 621
 622       /* switch programs */
 623       program = x;
 624       CACHE_PROGRAM ();
 625       /* shuffle down the program and the arguments */
 626       for (i = -1, sp = sp - nargs + 1; i < nargs; i++)
 627         SCM_FRAME_STACK_ADDRESS (fp)[i] = sp[i];
 628
 629       sp = fp + i - 1;
 630
 631       NULLSTACK (old_sp - sp);
 632
 633       ip = bp->base;
 634
 635       ENTER_HOOK ();
 636       APPLY_HOOK ();
 637       NEXT;
 638     }
 639
 640   /*
 641    * Other interpreted or compiled call
 642    */
 643   if (!SCM_FALSEP (scm_procedure_p (x)))
 644     {
 645       SCM args;
 646       POP_LIST (nargs);
 647       POP (args);
 648
 649       SYNC_REGISTER ();
 650       *sp = scm_apply (x, args, SCM_EOL);
 651       NULLSTACK_FOR_NONLOCAL_EXIT ();
 652
 653       if (SCM_UNLIKELY (SCM_VALUESP (*sp)))
 654         {
 655           /* multiple values returned to continuation */
 656           SCM values;
 657           POP (values);
 658           values = scm_struct_ref (values, SCM_INUM0);
 659           nvalues = scm_ilength (values);
 660           PUSH_LIST (values, SCM_NULLP);
 661           goto vm_return_values;
 662         }
 663       else
 664         goto vm_return;
 665     }
 666
 667   program = x;
 668
 669   goto vm_error_wrong_type_apply;
 670 }
 671
 672 VM_DEFINE_INSTRUCTION (45, goto_nargs, "goto/nargs", 0, 0, 1)
 673 {
 674   SCM x;
 675   POP (x);
 676   nargs = scm_to_int (x);
 677   /* FIXME: should truncate values? */
 678   goto vm_goto_args;
 679 }
 680
 681 VM_DEFINE_INSTRUCTION (46, call_nargs, "call/nargs", 0, 0, 1)
 682 {
 683   SCM x;
 684   POP (x);
 685   nargs = scm_to_int (x);
 686   /* FIXME: should truncate values? */
 687   goto vm_call;
 688 }
 689
 690 VM_DEFINE_INSTRUCTION (47, mv_call, "mv-call", 4, -1, 1)
 691 {
 692   SCM x;
 693   scm_t_int32 offset;
 694   scm_t_uint8 *mvra;
 695
 696   nargs = FETCH ();
 697   FETCH_OFFSET (offset);
 698   mvra = ip + offset;
 699
 700   x = sp[-nargs];
 701
 702   /*
 703    * Subprogram call
 704    */
 705   if (SCM_PROGRAM_P (x))
 706     {
 707       program = x;
 708       CACHE_PROGRAM ();
 709       fp = sp - nargs + 1;
 710       ASSERT (SCM_FRAME_RETURN_ADDRESS (fp) == 0);
 711       ASSERT (SCM_FRAME_MV_RETURN_ADDRESS (fp) == 0);
 712       SCM_FRAME_SET_RETURN_ADDRESS (fp, ip);
 713       SCM_FRAME_SET_MV_RETURN_ADDRESS (fp, mvra);
 714       ip = bp->base;
 715       ENTER_HOOK ();
 716       APPLY_HOOK ();
 717       NEXT;
 718     }
 719   /*
 720    * Other interpreted or compiled call
 721    */
 722   if (!SCM_FALSEP (scm_procedure_p (x)))
 723     {
 724       SCM args;
 725       /* At this point, the stack contains the procedure and each one of its
 726          arguments.  */
 727       POP_LIST (nargs);
 728       POP (args);
 729       DROP (); /* drop the procedure */
 730       DROP_FRAME ();
 731
 732       SYNC_REGISTER ();
 733       PUSH (scm_apply (x, args, SCM_EOL));
 734       NULLSTACK_FOR_NONLOCAL_EXIT ();
 735       if (SCM_VALUESP (*sp))
 736         {
 737           SCM values, len;
 738           POP (values);
 739           values = scm_struct_ref (values, SCM_INUM0);
 740           len = scm_length (values);
 741           PUSH_LIST (values, SCM_NULLP);
 742           PUSH (len);
 743           ip = mvra;
 744         }
 745       NEXT;
 746     }
 747
 748   program = x;
 749   goto vm_error_wrong_type_apply;
 750 }
 751
 752 VM_DEFINE_INSTRUCTION (48, apply, "apply", 1, -1, 1)
 753 {
 754   int len;
 755   SCM ls;
 756   POP (ls);
 757
 758   nargs = FETCH ();
 759   ASSERT (nargs >= 2);
 760
 761   len = scm_ilength (ls);
 762   if (len < 0)
 763     goto vm_error_wrong_type_arg;
 764
 765   PUSH_LIST (ls, SCM_NULL_OR_NIL_P);
 766
 767   nargs += len - 2;
 768   goto vm_call;
 769 }
 770
 771 VM_DEFINE_INSTRUCTION (49, goto_apply, "goto/apply", 1, -1, 1)
 772 {
 773   int len;
 774   SCM ls;
 775   POP (ls);
 776
 777   nargs = FETCH ();
 778   ASSERT (nargs >= 2);
 779
 780   len = scm_ilength (ls);
 781   if (len < 0)
 782     goto vm_error_wrong_type_arg;
 783
 784   PUSH_LIST (ls, SCM_NULL_OR_NIL_P);
 785
 786   nargs += len - 2;
 787   goto vm_goto_args;
 788 }
 789
 790 VM_DEFINE_INSTRUCTION (50, call_cc, "call/cc", 0, 1, 1)
 791 {
 792   int first;
 793   SCM proc, cont;
 794   POP (proc);
 795   SYNC_ALL ();
 796   cont = scm_make_continuation (&first);
 797   if (first)
 798     {
 799       PUSH ((SCM)fp); /* dynamic link */
 800       PUSH (0);  /* mvra */
 801       PUSH (0);  /* ra */
 802       PUSH (proc);
 803       PUSH (cont);
 804       nargs = 1;
 805       goto vm_call;
 806     }
 807   ASSERT (sp == vp->sp);
 808   ASSERT (fp == vp->fp);
 809   else if (SCM_VALUESP (cont))
 810     {
 811       /* multiple values returned to continuation */
 812       SCM values;
 813       values = scm_struct_ref (cont, SCM_INUM0);
 814       if (SCM_NULLP (values))
 815         goto vm_error_no_values;
 816       /* non-tail context does not accept multiple values? */
 817       PUSH (SCM_CAR (values));
 818       NEXT;
 819     }
 820   else
 821     {
 822       PUSH (cont);
 823       NEXT;
 824     }
 825 }
 826
 827 VM_DEFINE_INSTRUCTION (51, goto_cc, "goto/cc", 0, 1, 1)
 828 {
 829   int first;
 830   SCM proc, cont;
 831   POP (proc);
 832   SYNC_ALL ();
 833   cont = scm_make_continuation (&first);
 834   ASSERT (sp == vp->sp);
 835   ASSERT (fp == vp->fp);
 836   if (first)
 837     {
 838       PUSH (proc);
 839       PUSH (cont);
 840       nargs = 1;
 841       goto vm_goto_args;
 842     }
 843   else if (SCM_VALUESP (cont))
 844     {
 845       /* multiple values returned to continuation */
 846       SCM values;
 847       values = scm_struct_ref (cont, SCM_INUM0);
 848       nvalues = scm_ilength (values);
 849       PUSH_LIST (values, SCM_NULLP);
 850       goto vm_return_values;
 851     }
 852   else
 853     {
 854       PUSH (cont);
 855       goto vm_return;
 856     }
 857 }
 858
 859 VM_DEFINE_INSTRUCTION (52, return, "return", 0, 1, 1)
 860 {
 861  vm_return:
 862   EXIT_HOOK ();
 863   RETURN_HOOK ();
 864   SYNC_REGISTER ();
 865   SCM_TICK;     /* allow interrupt here */
 866   {
 867     SCM ret;
 868
 869     POP (ret);
 870
 871 #ifdef VM_ENABLE_STACK_NULLING
 872     SCM *old_sp = sp;
 873 #endif
 874
 875     /* Restore registers */
 876     sp = SCM_FRAME_LOWER_ADDRESS (fp);
 877     ip = SCM_FRAME_RETURN_ADDRESS (fp);
 878     fp = SCM_FRAME_DYNAMIC_LINK (fp);
 879
 880 #ifdef VM_ENABLE_STACK_NULLING
 881     NULLSTACK (old_sp - sp);
 882 #endif
 883
 884     /* Set return value (sp is already pushed) */
 885     *sp = ret;
 886   }
 887
 888   /* Restore the last program */
 889   program = SCM_FRAME_PROGRAM (fp);
 890   CACHE_PROGRAM ();
 891   CHECK_IP ();
 892   NEXT;
 893 }
 894
 895 VM_DEFINE_INSTRUCTION (53, return_values, "return/values", 1, -1, -1)
 896 {
 897   /* nvalues declared at top level, because for some reason gcc seems to think
 898      that perhaps it might be used without declaration. Fooey to that, I say. */
 899   nvalues = FETCH ();
 900  vm_return_values:
 901   EXIT_HOOK ();
 902   RETURN_HOOK ();
 903
 904   if (nvalues != 1 && SCM_FRAME_MV_RETURN_ADDRESS (fp))
 905     {
 906       /* A multiply-valued continuation */
 907       SCM *vals = sp - nvalues;
 908       int i;
 909       /* Restore registers */
 910       sp = SCM_FRAME_LOWER_ADDRESS (fp) - 1;
 911       ip = SCM_FRAME_MV_RETURN_ADDRESS (fp);
 912       fp = SCM_FRAME_DYNAMIC_LINK (fp);
 913
 914       /* Push return values, and the number of values */
 915       for (i = 0; i < nvalues; i++)
 916         *++sp = vals[i+1];
 917       *++sp = SCM_I_MAKINUM (nvalues);
 918
 919       /* Finally null the end of the stack */
 920       NULLSTACK (vals + nvalues - sp);
 921     }
 922   else if (nvalues >= 1)
 923     {
 924       /* Multiple values for a single-valued continuation -- here's where I
 925          break with guile tradition and try and do something sensible. (Also,
 926          this block handles the single-valued return to an mv
 927          continuation.) */
 928       SCM *vals = sp - nvalues;
 929       /* Restore registers */
 930       sp = SCM_FRAME_LOWER_ADDRESS (fp) - 1;
 931       ip = SCM_FRAME_RETURN_ADDRESS (fp);
 932       fp = SCM_FRAME_DYNAMIC_LINK (fp);
 933
 934       /* Push first value */
 935       *++sp = vals[1];
 936
 937       /* Finally null the end of the stack */
 938       NULLSTACK (vals + nvalues - sp);
 939     }
 940   else
 941     goto vm_error_no_values;
 942
 943   /* Restore the last program */
 944   program = SCM_FRAME_PROGRAM (fp);
 945   CACHE_PROGRAM ();
 946   CHECK_IP ();
 947   NEXT;
 948 }
 949
 950 VM_DEFINE_INSTRUCTION (54, return_values_star, "return/values*", 1, -1, -1)
 951 {
 952   SCM l;
 953
 954   nvalues = FETCH ();
 955   ASSERT (nvalues >= 1);
 956
 957   nvalues--;
 958   POP (l);
 959   while (SCM_CONSP (l))
 960     {
 961       PUSH (SCM_CAR (l));
 962       l = SCM_CDR (l);
 963       nvalues++;
 964     }
 965   if (SCM_UNLIKELY (!SCM_NULL_OR_NIL_P (l))) {
 966     finish_args = scm_list_1 (l);
 967     goto vm_error_improper_list;
 968   }
 969
 970   goto vm_return_values;
 971 }
 972
 973 VM_DEFINE_INSTRUCTION (55, truncate_values, "truncate-values", 2, -1, -1)
 974 {
 975   SCM x;
 976   int nbinds, rest;
 977   POP (x);
 978   nvalues = scm_to_int (x);
 979   nbinds = FETCH ();
 980   rest = FETCH ();
 981
 982   if (rest)
 983     nbinds--;
 984
 985   if (nvalues < nbinds)
 986     goto vm_error_not_enough_values;
 987
 988   if (rest)
 989     POP_LIST (nvalues - nbinds);
 990   else
 991     DROPN (nvalues - nbinds);
 992
 993   NEXT;
 994 }
 995
 996 VM_DEFINE_INSTRUCTION (56, box, "box", 1, 1, 0)
 997 {
 998   SCM val;
 999   POP (val);
1000   SYNC_BEFORE_GC ();
1001   LOCAL_SET (FETCH (), scm_cell (scm_tc7_variable, SCM_UNPACK (val)));
1002   NEXT;
1003 }
1004
1005 /* for letrec:
1006    (let ((a *undef*) (b *undef*) ...)
1007      (set! a (lambda () (b ...)))
1008      ...)
1009  */
1010 VM_DEFINE_INSTRUCTION (57, empty_box, "empty-box", 1, 0, 0)
1011 {
1012   SYNC_BEFORE_GC ();
1013   LOCAL_SET (FETCH (),
1014              scm_cell (scm_tc7_variable, SCM_UNPACK (SCM_UNDEFINED)));
1015   NEXT;
1016 }
1017
1018 VM_DEFINE_INSTRUCTION (58, local_boxed_ref, "local-boxed-ref", 1, 0, 1)
1019 {
1020   SCM v = LOCAL_REF (FETCH ());
1021   ASSERT_BOUND_VARIABLE (v);
1022   PUSH (VARIABLE_REF (v));
1023   NEXT;
1024 }
1025
1026 VM_DEFINE_INSTRUCTION (59, local_boxed_set, "local-boxed-set", 1, 1, 0)
1027 {
1028   SCM v, val;
1029   v = LOCAL_REF (FETCH ());
1030   POP (val);
1031   ASSERT_VARIABLE (v);
1032   VARIABLE_SET (v, val);
1033   NEXT;
1034 }
1035
1036 VM_DEFINE_INSTRUCTION (60, free_ref, "free-ref", 1, 0, 1)
1037 {
1038   scm_t_uint8 idx = FETCH ();
1039
1040   CHECK_FREE_VARIABLE (idx);
1041   PUSH (FREE_VARIABLE_REF (idx));
1042   NEXT;
1043 }
1044
1045 /* no free-set -- if a var is assigned, it should be in a box */
1046
1047 VM_DEFINE_INSTRUCTION (61, free_boxed_ref, "free-boxed-ref", 1, 0, 1)
1048 {
1049   SCM v;
1050   scm_t_uint8 idx = FETCH ();
1051   CHECK_FREE_VARIABLE (idx);
1052   v = FREE_VARIABLE_REF (idx);
1053   ASSERT_BOUND_VARIABLE (v);
1054   PUSH (VARIABLE_REF (v));
1055   NEXT;
1056 }
1057
1058 VM_DEFINE_INSTRUCTION (62, free_boxed_set, "free-boxed-set", 1, 1, 0)
1059 {
1060   SCM v, val;
1061   scm_t_uint8 idx = FETCH ();
1062   POP (val);
1063   CHECK_FREE_VARIABLE (idx);
1064   v = FREE_VARIABLE_REF (idx);
1065   ASSERT_BOUND_VARIABLE (v);
1066   VARIABLE_SET (v, val);
1067   NEXT;
1068 }
1069
1070 VM_DEFINE_INSTRUCTION (63, make_closure, "make-closure", 0, 2, 1)
1071 {
1072   SCM vect;
1073   POP (vect);
1074   SYNC_BEFORE_GC ();
1075   /* fixme underflow */
1076   *sp = scm_double_cell (scm_tc7_program, (scm_t_bits)SCM_PROGRAM_OBJCODE (*sp),
1077                          (scm_t_bits)SCM_PROGRAM_OBJTABLE (*sp), (scm_t_bits)vect);
1078   NEXT;
1079 }
1080
1081 VM_DEFINE_INSTRUCTION (64, make_variable, "make-variable", 0, 0, 1)
1082 {
1083   SYNC_BEFORE_GC ();
1084   /* fixme underflow */
1085   PUSH (scm_cell (scm_tc7_variable, SCM_UNPACK (SCM_UNDEFINED)));
1086   NEXT;
1087 }
1088
1089 VM_DEFINE_INSTRUCTION (65, fix_closure, "fix-closure", 2, 0, 1)
1090 {
1091   SCM x, vect;
1092   unsigned int i = FETCH ();
1093   i <<= 8;
1094   i += FETCH ();
1095   POP (vect);
1096   /* FIXME CHECK_LOCAL (i) */
1097   x = LOCAL_REF (i);
1098   /* FIXME ASSERT_PROGRAM (x); */
1099   SCM_SET_CELL_WORD_3 (x, vect);
1100   NEXT;
1101 }
1102
1103 VM_DEFINE_INSTRUCTION (66, define, "define", 0, 0, 2)
1104 {
1105   SCM sym, val;
1106   POP (sym);
1107   POP (val);
1108   SYNC_REGISTER ();
1109   VARIABLE_SET (scm_sym2var (sym, scm_current_module_lookup_closure (),
1110                              SCM_BOOL_T),
1111                 val);
1112   NEXT;
1113 }
1114
1115 VM_DEFINE_INSTRUCTION (67, make_keyword, "make-keyword", 0, 1, 1)
1116 {
1117   CHECK_UNDERFLOW ();
1118   SYNC_REGISTER ();
1119   *sp = scm_symbol_to_keyword (*sp);
1120   NEXT;
1121 }
1122
1123 VM_DEFINE_INSTRUCTION (68, make_symbol, "make-symbol", 0, 1, 1)
1124 {
1125   CHECK_UNDERFLOW ();
1126   SYNC_REGISTER ();
1127   *sp = scm_string_to_symbol (*sp);
1128   NEXT;
1129 }
1130
1131
1132 /*
1133 (defun renumber-ops ()
1134   "start from top of buffer and renumber 'VM_DEFINE_FOO (\n' sequences"
1135   (interactive "")
1136   (save-excursion
1137     (let ((counter -1)) (goto-char (point-min))
1138       (while (re-search-forward "^VM_DEFINE_[^ ]+ (\\([^,]+\\)," (point-max) t)
1139         (replace-match
1140          (number-to-string (setq counter (1+ counter)))
1141           t t nil 1)))))
1142 */
1143 /*
1144   Local Variables:
1145   c-file-style: "gnu"
1146   End:
1147 */