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 0
 489   if (sp - fp != n)
 490     goto vm_error_wrong_num_args;
 491 #endif
 492   NEXT;
 493 }
 494
 495 VM_DEFINE_INSTRUCTION (39, assert_nargs_ge, "assert-nargs-ge", 2, 0, 0)
 496 {
 497   scm_t_ptrdiff n;
 498   n = FETCH () << 8;
 499   n += FETCH ();
 500 #if 0
 501   if (sp - fp < n)
 502     goto vm_error_wrong_num_args;
 503 #endif
 504   NEXT;
 505 }
 506
 507 VM_DEFINE_INSTRUCTION (40, push_rest_list, "push-rest-list", 2, -1, -1)
 508 {
 509   scm_t_ptrdiff n;
 510   n = FETCH () << 8;
 511   n += FETCH ();
 512 #if 0
 513   SCM rest = SCM_EOL;
 514   while (sp - fp >= n)
 515     /* No need to check for underflow. */
 516     CONS (rest, *sp--, rest);
 517   PUSH (rest);
 518 #endif
 519   NEXT;
 520 }
 521
 522 VM_DEFINE_INSTRUCTION (41, reserve_locals, "reserve-locals", 2, -1, -1)
 523 {
 524   scm_t_int32 n;
 525   n = FETCH () << 8;
 526   n += FETCH ();
 527 #if 0
 528   sp += n;
 529   CHECK_OVERFLOW ();
 530   while (n--)
 531     sp[-n] = SCM_UNDEFINED;
 532 #endif
 533   NEXT;
 534 }
 535
 536 VM_DEFINE_INSTRUCTION (42, new_frame, "new-frame", 0, 0, 3)
 537 {
 538   /* NB: if you change this, see frames.c:vm-frame-num-locals */
 539   /* and frames.h, vm-engine.c, etc of course */
 540   PUSH ((SCM)fp); /* dynamic link */
 541   PUSH (0);  /* mvra */
 542   PUSH (0);  /* ra */
 543   NEXT;
 544 }
 545
 546 VM_DEFINE_INSTRUCTION (43, call, "call", 1, -1, 1)
 547 {
 548   SCM x;
 549   nargs = FETCH ();
 550
 551  vm_call:
 552   x = sp[-nargs];
 553
 554   SYNC_REGISTER ();
 555   SCM_TICK;     /* allow interrupt here */
 556
 557   /*
 558    * Subprogram call
 559    */
 560   if (SCM_PROGRAM_P (x))
 561     {
 562       program = x;
 563       CACHE_PROGRAM ();
 564       INIT_ARGS ();
 565       fp = sp - bp->nargs + 1;
 566       ASSERT (SCM_FRAME_RETURN_ADDRESS (fp) == 0);
 567       ASSERT (SCM_FRAME_MV_RETURN_ADDRESS (fp) == 0);
 568       SCM_FRAME_SET_RETURN_ADDRESS (fp, ip);
 569       SCM_FRAME_SET_MV_RETURN_ADDRESS (fp, 0);
 570       INIT_FRAME ();
 571       ENTER_HOOK ();
 572       APPLY_HOOK ();
 573       NEXT;
 574     }
 575   /*
 576    * Other interpreted or compiled call
 577    */
 578   if (!SCM_FALSEP (scm_procedure_p (x)))
 579     {
 580       SCM args;
 581       /* At this point, the stack contains the frame, the procedure and each one
 582          of its arguments. */
 583       POP_LIST (nargs);
 584       POP (args);
 585       DROP (); /* drop the procedure */
 586       DROP_FRAME ();
 587
 588       SYNC_REGISTER ();
 589       PUSH (scm_apply (x, args, SCM_EOL));
 590       NULLSTACK_FOR_NONLOCAL_EXIT ();
 591       if (SCM_UNLIKELY (SCM_VALUESP (*sp)))
 592         {
 593           /* truncate values */
 594           SCM values;
 595           POP (values);
 596           values = scm_struct_ref (values, SCM_INUM0);
 597           if (scm_is_null (values))
 598             goto vm_error_not_enough_values;
 599           PUSH (SCM_CAR (values));
 600         }
 601       NEXT;
 602     }
 603
 604   program = x;
 605   goto vm_error_wrong_type_apply;
 606 }
 607
 608 VM_DEFINE_INSTRUCTION (44, goto_args, "goto/args", 1, -1, 1)
 609 {
 610   register SCM x;
 611   nargs = FETCH ();
 612  vm_goto_args:
 613   x = sp[-nargs];
 614
 615   SYNC_REGISTER ();
 616   SCM_TICK;     /* allow interrupt here */
 617
 618   /*
 619    * Tail call
 620    */
 621   if (SCM_PROGRAM_P (x))
 622     {
 623       int i;
 624 #ifdef VM_ENABLE_STACK_NULLING
 625       SCM *old_sp;
 626 #endif
 627
 628       EXIT_HOOK ();
 629
 630       /* switch programs */
 631       program = x;
 632       CACHE_PROGRAM ();
 633       INIT_ARGS ();
 634
 635 #ifdef VM_ENABLE_STACK_NULLING
 636       old_sp = sp;
 637       CHECK_STACK_LEAK ();
 638 #endif
 639
 640       /* delay shuffling the new program+args down so that if INIT_ARGS had to
 641          cons up a rest arg, going into GC, the stack still made sense */
 642       for (i = -1, sp = sp - bp->nargs + 1; i < bp->nargs; i++)
 643         fp[i] = sp[i];
 644       sp = fp + i - 1;
 645
 646       NULLSTACK (old_sp - sp);
 647
 648       INIT_FRAME ();
 649
 650       ENTER_HOOK ();
 651       APPLY_HOOK ();
 652       NEXT;
 653     }
 654
 655   /*
 656    * Other interpreted or compiled call
 657    */
 658   if (!SCM_FALSEP (scm_procedure_p (x)))
 659     {
 660       SCM args;
 661       POP_LIST (nargs);
 662       POP (args);
 663
 664       SYNC_REGISTER ();
 665       *sp = scm_apply (x, args, SCM_EOL);
 666       NULLSTACK_FOR_NONLOCAL_EXIT ();
 667
 668       if (SCM_UNLIKELY (SCM_VALUESP (*sp)))
 669         {
 670           /* multiple values returned to continuation */
 671           SCM values;
 672           POP (values);
 673           values = scm_struct_ref (values, SCM_INUM0);
 674           nvalues = scm_ilength (values);
 675           PUSH_LIST (values, SCM_NULLP);
 676           goto vm_return_values;
 677         }
 678       else
 679         goto vm_return;
 680     }
 681
 682   program = x;
 683
 684   goto vm_error_wrong_type_apply;
 685 }
 686
 687 VM_DEFINE_INSTRUCTION (45, goto_nargs, "goto/nargs", 0, 0, 1)
 688 {
 689   SCM x;
 690   POP (x);
 691   nargs = scm_to_int (x);
 692   /* FIXME: should truncate values? */
 693   goto vm_goto_args;
 694 }
 695
 696 VM_DEFINE_INSTRUCTION (46, call_nargs, "call/nargs", 0, 0, 1)
 697 {
 698   SCM x;
 699   POP (x);
 700   nargs = scm_to_int (x);
 701   /* FIXME: should truncate values? */
 702   goto vm_call;
 703 }
 704
 705 VM_DEFINE_INSTRUCTION (47, mv_call, "mv-call", 4, -1, 1)
 706 {
 707   SCM x;
 708   scm_t_int32 offset;
 709   scm_t_uint8 *mvra;
 710
 711   nargs = FETCH ();
 712   FETCH_OFFSET (offset);
 713   mvra = ip + offset;
 714
 715   x = sp[-nargs];
 716
 717   /*
 718    * Subprogram call
 719    */
 720   if (SCM_PROGRAM_P (x))
 721     {
 722       program = x;
 723       CACHE_PROGRAM ();
 724       INIT_ARGS ();
 725       fp = sp - bp->nargs + 1;
 726       ASSERT (SCM_FRAME_RETURN_ADDRESS (fp) == 0);
 727       ASSERT (SCM_FRAME_MV_RETURN_ADDRESS (fp) == 0);
 728       SCM_FRAME_SET_RETURN_ADDRESS (fp, ip);
 729       SCM_FRAME_SET_MV_RETURN_ADDRESS (fp, mvra);
 730       INIT_FRAME ();
 731       ENTER_HOOK ();
 732       APPLY_HOOK ();
 733       NEXT;
 734     }
 735   /*
 736    * Other interpreted or compiled call
 737    */
 738   if (!SCM_FALSEP (scm_procedure_p (x)))
 739     {
 740       SCM args;
 741       /* At this point, the stack contains the procedure and each one of its
 742          arguments.  */
 743       POP_LIST (nargs);
 744       POP (args);
 745       DROP (); /* drop the procedure */
 746       DROP_FRAME ();
 747
 748       SYNC_REGISTER ();
 749       PUSH (scm_apply (x, args, SCM_EOL));
 750       NULLSTACK_FOR_NONLOCAL_EXIT ();
 751       if (SCM_VALUESP (*sp))
 752         {
 753           SCM values, len;
 754           POP (values);
 755           values = scm_struct_ref (values, SCM_INUM0);
 756           len = scm_length (values);
 757           PUSH_LIST (values, SCM_NULLP);
 758           PUSH (len);
 759           ip = mvra;
 760         }
 761       NEXT;
 762     }
 763
 764   program = x;
 765   goto vm_error_wrong_type_apply;
 766 }
 767
 768 VM_DEFINE_INSTRUCTION (48, apply, "apply", 1, -1, 1)
 769 {
 770   int len;
 771   SCM ls;
 772   POP (ls);
 773
 774   nargs = FETCH ();
 775   ASSERT (nargs >= 2);
 776
 777   len = scm_ilength (ls);
 778   if (len < 0)
 779     goto vm_error_wrong_type_arg;
 780
 781   PUSH_LIST (ls, SCM_NULL_OR_NIL_P);
 782
 783   nargs += len - 2;
 784   goto vm_call;
 785 }
 786
 787 VM_DEFINE_INSTRUCTION (49, goto_apply, "goto/apply", 1, -1, 1)
 788 {
 789   int len;
 790   SCM ls;
 791   POP (ls);
 792
 793   nargs = FETCH ();
 794   ASSERT (nargs >= 2);
 795
 796   len = scm_ilength (ls);
 797   if (len < 0)
 798     goto vm_error_wrong_type_arg;
 799
 800   PUSH_LIST (ls, SCM_NULL_OR_NIL_P);
 801
 802   nargs += len - 2;
 803   goto vm_goto_args;
 804 }
 805
 806 VM_DEFINE_INSTRUCTION (50, call_cc, "call/cc", 0, 1, 1)
 807 {
 808   int first;
 809   SCM proc, cont;
 810   POP (proc);
 811   SYNC_ALL ();
 812   cont = scm_make_continuation (&first);
 813   if (first)
 814     {
 815       PUSH ((SCM)fp); /* dynamic link */
 816       PUSH (0);  /* mvra */
 817       PUSH (0);  /* ra */
 818       PUSH (proc);
 819       PUSH (cont);
 820       nargs = 1;
 821       goto vm_call;
 822     }
 823   ASSERT (sp == vp->sp);
 824   ASSERT (fp == vp->fp);
 825   else if (SCM_VALUESP (cont))
 826     {
 827       /* multiple values returned to continuation */
 828       SCM values;
 829       values = scm_struct_ref (cont, SCM_INUM0);
 830       if (SCM_NULLP (values))
 831         goto vm_error_no_values;
 832       /* non-tail context does not accept multiple values? */
 833       PUSH (SCM_CAR (values));
 834       NEXT;
 835     }
 836   else
 837     {
 838       PUSH (cont);
 839       NEXT;
 840     }
 841 }
 842
 843 VM_DEFINE_INSTRUCTION (51, goto_cc, "goto/cc", 0, 1, 1)
 844 {
 845   int first;
 846   SCM proc, cont;
 847   POP (proc);
 848   SYNC_ALL ();
 849   cont = scm_make_continuation (&first);
 850   ASSERT (sp == vp->sp);
 851   ASSERT (fp == vp->fp);
 852   if (first)
 853     {
 854       PUSH (proc);
 855       PUSH (cont);
 856       nargs = 1;
 857       goto vm_goto_args;
 858     }
 859   else if (SCM_VALUESP (cont))
 860     {
 861       /* multiple values returned to continuation */
 862       SCM values;
 863       values = scm_struct_ref (cont, SCM_INUM0);
 864       nvalues = scm_ilength (values);
 865       PUSH_LIST (values, SCM_NULLP);
 866       goto vm_return_values;
 867     }
 868   else
 869     {
 870       PUSH (cont);
 871       goto vm_return;
 872     }
 873 }
 874
 875 VM_DEFINE_INSTRUCTION (52, return, "return", 0, 1, 1)
 876 {
 877  vm_return:
 878   EXIT_HOOK ();
 879   RETURN_HOOK ();
 880   SYNC_REGISTER ();
 881   SCM_TICK;     /* allow interrupt here */
 882   {
 883     SCM ret;
 884
 885     POP (ret);
 886
 887 #ifdef VM_ENABLE_STACK_NULLING
 888     SCM *old_sp = sp;
 889 #endif
 890
 891     /* Restore registers */
 892     sp = SCM_FRAME_LOWER_ADDRESS (fp);
 893     ip = SCM_FRAME_RETURN_ADDRESS (fp);
 894     fp = SCM_FRAME_DYNAMIC_LINK (fp);
 895
 896 #ifdef VM_ENABLE_STACK_NULLING
 897     NULLSTACK (old_sp - sp);
 898 #endif
 899
 900     /* Set return value (sp is already pushed) */
 901     *sp = ret;
 902   }
 903
 904   /* Restore the last program */
 905   program = SCM_FRAME_PROGRAM (fp);
 906   CACHE_PROGRAM ();
 907   CHECK_IP ();
 908   NEXT;
 909 }
 910
 911 VM_DEFINE_INSTRUCTION (53, return_values, "return/values", 1, -1, -1)
 912 {
 913   /* nvalues declared at top level, because for some reason gcc seems to think
 914      that perhaps it might be used without declaration. Fooey to that, I say. */
 915   nvalues = FETCH ();
 916  vm_return_values:
 917   EXIT_HOOK ();
 918   RETURN_HOOK ();
 919
 920   if (nvalues != 1 && SCM_FRAME_MV_RETURN_ADDRESS (fp))
 921     {
 922       /* A multiply-valued continuation */
 923       SCM *vals = sp - nvalues;
 924       int i;
 925       /* Restore registers */
 926       sp = SCM_FRAME_LOWER_ADDRESS (fp) - 1;
 927       ip = SCM_FRAME_MV_RETURN_ADDRESS (fp);
 928       fp = SCM_FRAME_DYNAMIC_LINK (fp);
 929
 930       /* Push return values, and the number of values */
 931       for (i = 0; i < nvalues; i++)
 932         *++sp = vals[i+1];
 933       *++sp = SCM_I_MAKINUM (nvalues);
 934
 935       /* Finally null the end of the stack */
 936       NULLSTACK (vals + nvalues - sp);
 937     }
 938   else if (nvalues >= 1)
 939     {
 940       /* Multiple values for a single-valued continuation -- here's where I
 941          break with guile tradition and try and do something sensible. (Also,
 942          this block handles the single-valued return to an mv
 943          continuation.) */
 944       SCM *vals = sp - nvalues;
 945       /* Restore registers */
 946       sp = SCM_FRAME_LOWER_ADDRESS (fp) - 1;
 947       ip = SCM_FRAME_RETURN_ADDRESS (fp);
 948       fp = SCM_FRAME_DYNAMIC_LINK (fp);
 949
 950       /* Push first value */
 951       *++sp = vals[1];
 952
 953       /* Finally null the end of the stack */
 954       NULLSTACK (vals + nvalues - sp);
 955     }
 956   else
 957     goto vm_error_no_values;
 958
 959   /* Restore the last program */
 960   program = SCM_FRAME_PROGRAM (fp);
 961   CACHE_PROGRAM ();
 962   CHECK_IP ();
 963   NEXT;
 964 }
 965
 966 VM_DEFINE_INSTRUCTION (54, return_values_star, "return/values*", 1, -1, -1)
 967 {
 968   SCM l;
 969
 970   nvalues = FETCH ();
 971   ASSERT (nvalues >= 1);
 972
 973   nvalues--;
 974   POP (l);
 975   while (SCM_CONSP (l))
 976     {
 977       PUSH (SCM_CAR (l));
 978       l = SCM_CDR (l);
 979       nvalues++;
 980     }
 981   if (SCM_UNLIKELY (!SCM_NULL_OR_NIL_P (l))) {
 982     finish_args = scm_list_1 (l);
 983     goto vm_error_improper_list;
 984   }
 985
 986   goto vm_return_values;
 987 }
 988
 989 VM_DEFINE_INSTRUCTION (55, truncate_values, "truncate-values", 2, -1, -1)
 990 {
 991   SCM x;
 992   int nbinds, rest;
 993   POP (x);
 994   nvalues = scm_to_int (x);
 995   nbinds = FETCH ();
 996   rest = FETCH ();
 997
 998   if (rest)
 999     nbinds--;
1000
1001   if (nvalues < nbinds)
1002     goto vm_error_not_enough_values;
1003
1004   if (rest)
1005     POP_LIST (nvalues - nbinds);
1006   else
1007     DROPN (nvalues - nbinds);
1008
1009   NEXT;
1010 }
1011
1012 VM_DEFINE_INSTRUCTION (56, box, "box", 1, 1, 0)
1013 {
1014   SCM val;
1015   POP (val);
1016   SYNC_BEFORE_GC ();
1017   LOCAL_SET (FETCH (), scm_cell (scm_tc7_variable, SCM_UNPACK (val)));
1018   NEXT;
1019 }
1020
1021 /* for letrec:
1022    (let ((a *undef*) (b *undef*) ...)
1023      (set! a (lambda () (b ...)))
1024      ...)
1025  */
1026 VM_DEFINE_INSTRUCTION (57, empty_box, "empty-box", 1, 0, 0)
1027 {
1028   SYNC_BEFORE_GC ();
1029   LOCAL_SET (FETCH (),
1030              scm_cell (scm_tc7_variable, SCM_UNPACK (SCM_UNDEFINED)));
1031   NEXT;
1032 }
1033
1034 VM_DEFINE_INSTRUCTION (58, local_boxed_ref, "local-boxed-ref", 1, 0, 1)
1035 {
1036   SCM v = LOCAL_REF (FETCH ());
1037   ASSERT_BOUND_VARIABLE (v);
1038   PUSH (VARIABLE_REF (v));
1039   NEXT;
1040 }
1041
1042 VM_DEFINE_INSTRUCTION (59, local_boxed_set, "local-boxed-set", 1, 1, 0)
1043 {
1044   SCM v, val;
1045   v = LOCAL_REF (FETCH ());
1046   POP (val);
1047   ASSERT_VARIABLE (v);
1048   VARIABLE_SET (v, val);
1049   NEXT;
1050 }
1051
1052 VM_DEFINE_INSTRUCTION (60, free_ref, "free-ref", 1, 0, 1)
1053 {
1054   scm_t_uint8 idx = FETCH ();
1055
1056   CHECK_FREE_VARIABLE (idx);
1057   PUSH (FREE_VARIABLE_REF (idx));
1058   NEXT;
1059 }
1060
1061 /* no free-set -- if a var is assigned, it should be in a box */
1062
1063 VM_DEFINE_INSTRUCTION (61, free_boxed_ref, "free-boxed-ref", 1, 0, 1)
1064 {
1065   SCM v;
1066   scm_t_uint8 idx = FETCH ();
1067   CHECK_FREE_VARIABLE (idx);
1068   v = FREE_VARIABLE_REF (idx);
1069   ASSERT_BOUND_VARIABLE (v);
1070   PUSH (VARIABLE_REF (v));
1071   NEXT;
1072 }
1073
1074 VM_DEFINE_INSTRUCTION (62, free_boxed_set, "free-boxed-set", 1, 1, 0)
1075 {
1076   SCM v, val;
1077   scm_t_uint8 idx = FETCH ();
1078   POP (val);
1079   CHECK_FREE_VARIABLE (idx);
1080   v = FREE_VARIABLE_REF (idx);
1081   ASSERT_BOUND_VARIABLE (v);
1082   VARIABLE_SET (v, val);
1083   NEXT;
1084 }
1085
1086 VM_DEFINE_INSTRUCTION (63, make_closure, "make-closure", 0, 2, 1)
1087 {
1088   SCM vect;
1089   POP (vect);
1090   SYNC_BEFORE_GC ();
1091   /* fixme underflow */
1092   *sp = scm_double_cell (scm_tc7_program, (scm_t_bits)SCM_PROGRAM_OBJCODE (*sp),
1093                          (scm_t_bits)SCM_PROGRAM_OBJTABLE (*sp), (scm_t_bits)vect);
1094   NEXT;
1095 }
1096
1097 VM_DEFINE_INSTRUCTION (64, make_variable, "make-variable", 0, 0, 1)
1098 {
1099   SYNC_BEFORE_GC ();
1100   /* fixme underflow */
1101   PUSH (scm_cell (scm_tc7_variable, SCM_UNPACK (SCM_UNDEFINED)));
1102   NEXT;
1103 }
1104
1105 VM_DEFINE_INSTRUCTION (65, fix_closure, "fix-closure", 2, 0, 1)
1106 {
1107   SCM x, vect;
1108   unsigned int i = FETCH ();
1109   i <<= 8;
1110   i += FETCH ();
1111   POP (vect);
1112   /* FIXME CHECK_LOCAL (i) */
1113   x = LOCAL_REF (i);
1114   /* FIXME ASSERT_PROGRAM (x); */
1115   SCM_SET_CELL_WORD_3 (x, vect);
1116   NEXT;
1117 }
1118
1119 VM_DEFINE_INSTRUCTION (66, define, "define", 0, 0, 2)
1120 {
1121   SCM sym, val;
1122   POP (sym);
1123   POP (val);
1124   SYNC_REGISTER ();
1125   VARIABLE_SET (scm_sym2var (sym, scm_current_module_lookup_closure (),
1126                              SCM_BOOL_T),
1127                 val);
1128   NEXT;
1129 }
1130
1131 VM_DEFINE_INSTRUCTION (67, make_keyword, "make-keyword", 0, 1, 1)
1132 {
1133   CHECK_UNDERFLOW ();
1134   SYNC_REGISTER ();
1135   *sp = scm_symbol_to_keyword (*sp);
1136   NEXT;
1137 }
1138
1139 VM_DEFINE_INSTRUCTION (68, make_symbol, "make-symbol", 0, 1, 1)
1140 {
1141   CHECK_UNDERFLOW ();
1142   SYNC_REGISTER ();
1143   *sp = scm_string_to_symbol (*sp);
1144   NEXT;
1145 }
1146
1147
1148 /*
1149 (defun renumber-ops ()
1150   "start from top of buffer and renumber 'VM_DEFINE_FOO (\n' sequences"
1151   (interactive "")
1152   (save-excursion
1153     (let ((counter -1)) (goto-char (point-min))
1154       (while (re-search-forward "^VM_DEFINE_[^ ]+ (\\([^,]+\\)," (point-max) t)
1155         (replace-match
1156          (number-to-string (setq counter (1+ counter)))
1157           t t nil 1)))))
1158 */
1159 /*
1160   Local Variables:
1161   c-file-style: "gnu"
1162   End:
1163 */