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