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
   5  * License as published by the Free Software Foundation; either
   6  * version 2.1 of the License, or (at your option) any later version.
   7  *
   8  * This library is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 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 02110-1301 USA
  16  */
  17
  18
  19 /* This file is included in vm_engine.c */
  20
  21 \f
  22 /*
  23  * Basic operations
  24  */
  25
  26 VM_DEFINE_INSTRUCTION (0, nop, "nop", 0, 0, 0)
  27 {
  28   NEXT;
  29 }
  30
  31 VM_DEFINE_INSTRUCTION (1, halt, "halt", 0, 0, 0)
  32 {
  33   vp->time += scm_c_get_internal_run_time () - start_time;
  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     ASSERT (sp == stack_base);
  49     ASSERT (stack_base == SCM_FRAME_UPPER_ADDRESS (fp) - 1);
  50
  51     /* Restore registers */
  52     sp = SCM_FRAME_LOWER_ADDRESS (fp) - 1;
  53     ip = NULL;
  54     fp = SCM_FRAME_DYNAMIC_LINK (fp);
  55     NULLSTACK (stack_base - sp);
  56   }
  57
  58   goto vm_done;
  59 }
  60
  61 VM_DEFINE_INSTRUCTION (2, break, "break", 0, 0, 0)
  62 {
  63   BREAK_HOOK ();
  64   NEXT;
  65 }
  66
  67 VM_DEFINE_INSTRUCTION (3, drop, "drop", 0, 1, 0)
  68 {
  69   DROP ();
  70   NEXT;
  71 }
  72
  73 VM_DEFINE_INSTRUCTION (4, mark, "mark", 0, 0, 1)
  74 {
  75   PUSH (SCM_UNDEFINED);
  76   NEXT;
  77 }
  78
  79 VM_DEFINE_INSTRUCTION (5, dup, "dup", 0, 0, 1)
  80 {
  81   SCM x = *sp;
  82   PUSH (x);
  83   NEXT;
  84 }
  85
  86 \f
  87 /*
  88  * Object creation
  89  */
  90
  91 VM_DEFINE_INSTRUCTION (6, void, "void", 0, 0, 1)
  92 {
  93   PUSH (SCM_UNSPECIFIED);
  94   NEXT;
  95 }
  96
  97 VM_DEFINE_INSTRUCTION (7, make_true, "make-true", 0, 0, 1)
  98 {
  99   PUSH (SCM_BOOL_T);
 100   NEXT;
 101 }
 102
 103 VM_DEFINE_INSTRUCTION (8, make_false, "make-false", 0, 0, 1)
 104 {
 105   PUSH (SCM_BOOL_F);
 106   NEXT;
 107 }
 108
 109 VM_DEFINE_INSTRUCTION (9, make_eol, "make-eol", 0, 0, 1)
 110 {
 111   PUSH (SCM_EOL);
 112   NEXT;
 113 }
 114
 115 VM_DEFINE_INSTRUCTION (10, make_int8, "make-int8", 1, 0, 1)
 116 {
 117   PUSH (SCM_I_MAKINUM ((signed char) FETCH ()));
 118   NEXT;
 119 }
 120
 121 VM_DEFINE_INSTRUCTION (11, make_int8_0, "make-int8:0", 0, 0, 1)
 122 {
 123   PUSH (SCM_INUM0);
 124   NEXT;
 125 }
 126
 127 VM_DEFINE_INSTRUCTION (12, make_int8_1, "make-int8:1", 0, 0, 1)
 128 {
 129   PUSH (SCM_I_MAKINUM (1));
 130   NEXT;
 131 }
 132
 133 VM_DEFINE_INSTRUCTION (13, make_int16, "make-int16", 2, 0, 1)
 134 {
 135   int h = FETCH ();
 136   int l = FETCH ();
 137   PUSH (SCM_I_MAKINUM ((signed short) (h << 8) + l));
 138   NEXT;
 139 }
 140
 141 VM_DEFINE_INSTRUCTION (14, make_char8, "make-char8", 1, 0, 1)
 142 {
 143   PUSH (SCM_MAKE_CHAR (FETCH ()));
 144   NEXT;
 145 }
 146
 147 VM_DEFINE_INSTRUCTION (15, list, "list", 2, -1, 1)
 148 {
 149   unsigned h = FETCH ();
 150   unsigned l = FETCH ();
 151   unsigned len = ((h << 8) + l);
 152   POP_LIST (len);
 153   NEXT;
 154 }
 155
 156 VM_DEFINE_INSTRUCTION (16, vector, "vector", 2, -1, 1)
 157 {
 158   unsigned h = FETCH ();
 159   unsigned l = FETCH ();
 160   unsigned len = ((h << 8) + l);
 161   SCM vect;
 162
 163   SYNC_REGISTER ();
 164   sp++; sp -= len;
 165   CHECK_UNDERFLOW ();
 166   vect = scm_make_vector (scm_from_uint (len), SCM_BOOL_F);
 167   memcpy (SCM_I_VECTOR_WELTS(vect), sp, sizeof(SCM) * len);
 168   NULLSTACK (len);
 169   *sp = vect;
 170
 171   NEXT;
 172 }
 173
 174 VM_DEFINE_INSTRUCTION (17, list_mark, "list-mark", 0, 0, 0)
 175 {
 176   POP_LIST_MARK ();
 177   NEXT;
 178 }
 179
 180 VM_DEFINE_INSTRUCTION (18, cons_mark, "cons-mark", 0, 0, 0)
 181 {
 182   POP_CONS_MARK ();
 183   NEXT;
 184 }
 185
 186 VM_DEFINE_INSTRUCTION (19, vector_mark, "vector-mark", 0, 0, 0)
 187 {
 188   POP_LIST_MARK ();
 189   SYNC_REGISTER ();
 190   *sp = scm_vector (*sp);
 191   NEXT;
 192 }
 193
 194 VM_DEFINE_INSTRUCTION (20, list_break, "list-break", 0, 0, 0)
 195 {
 196   SCM l;
 197   POP (l);
 198   PUSH_LIST (l, SCM_NULLP);
 199   NEXT;
 200 }
 201
 202 \f
 203 /*
 204  * Variable access
 205  */
 206
 207 #define OBJECT_REF(i)           objects[i]
 208 #define OBJECT_SET(i,o)         objects[i] = o
 209
 210 #define LOCAL_REF(i)            SCM_FRAME_VARIABLE (fp, i)
 211 #define LOCAL_SET(i,o)          SCM_FRAME_VARIABLE (fp, i) = o
 212
 213 /* For the variable operations, we _must_ obviously avoid function calls to
 214    `scm_variable_ref ()', `scm_variable_bound_p ()' and friends which do
 215    nothing more than the corresponding macros.  */
 216 #define VARIABLE_REF(v)         SCM_VARIABLE_REF (v)
 217 #define VARIABLE_SET(v,o)       SCM_VARIABLE_SET (v, o)
 218 #define VARIABLE_BOUNDP(v)      (VARIABLE_REF (v) != SCM_UNDEFINED)
 219
 220 /* ref */
 221
 222 VM_DEFINE_INSTRUCTION (21, object_ref, "object-ref", 1, 0, 1)
 223 {
 224   register unsigned objnum = FETCH ();
 225   CHECK_OBJECT (objnum);
 226   PUSH (OBJECT_REF (objnum));
 227   NEXT;
 228 }
 229
 230 VM_DEFINE_INSTRUCTION (22, local_ref, "local-ref", 1, 0, 1)
 231 {
 232   PUSH (LOCAL_REF (FETCH ()));
 233   NEXT;
 234 }
 235
 236 VM_DEFINE_INSTRUCTION (23, external_ref, "external-ref", 1, 0, 1)
 237 {
 238   unsigned int i;
 239   SCM e = external;
 240   for (i = FETCH (); i; i--)
 241     {
 242       CHECK_EXTERNAL(e);
 243       e = SCM_CDR (e);
 244     }
 245   CHECK_EXTERNAL(e);
 246   PUSH (SCM_CAR (e));
 247   NEXT;
 248 }
 249
 250 VM_DEFINE_INSTRUCTION (24, variable_ref, "variable-ref", 0, 0, 1)
 251 {
 252   SCM x = *sp;
 253
 254   if (!VARIABLE_BOUNDP (x))
 255     {
 256       finish_args = SCM_LIST1 (x);
 257       /* Was: finish_args = SCM_LIST1 (SCM_CAR (x)); */
 258       goto vm_error_unbound;
 259     }
 260   else
 261     {
 262       SCM o = VARIABLE_REF (x);
 263       *sp = o;
 264     }
 265
 266   NEXT;
 267 }
 268
 269 VM_DEFINE_INSTRUCTION (25, toplevel_ref, "toplevel-ref", 1, 0, 1)
 270 {
 271   unsigned objnum = FETCH ();
 272   SCM what;
 273   CHECK_OBJECT (objnum);
 274   what = OBJECT_REF (objnum);
 275
 276   if (!SCM_VARIABLEP (what))
 277     {
 278       SYNC_REGISTER ();
 279       if (SCM_LIKELY (SCM_SYMBOLP (what)))
 280         {
 281           SCM mod = SCM_EOL;
 282           if (SCM_LIKELY (scm_module_system_booted_p
 283                           && scm_is_true ((mod = scm_program_module (program)))))
 284             /* might longjmp */
 285             what = scm_module_lookup (mod, what);
 286           else
 287             what = scm_sym2var (what, SCM_BOOL_F, SCM_BOOL_F);
 288         }
 289       else
 290         {
 291           SCM mod;
 292           /* compilation of @ or @@
 293              `what' is a three-element list: (MODNAME SYM INTERFACE?)
 294              INTERFACE? is #t if we compiled @ or #f if we compiled @@
 295           */
 296           mod = scm_resolve_module (SCM_CAR (what));
 297           if (scm_is_true (SCM_CADDR (what)))
 298             mod = scm_module_public_interface (mod);
 299           if (SCM_FALSEP (mod))
 300             {
 301               finish_args = SCM_LIST1 (mod);
 302               goto vm_error_no_such_module;
 303             }
 304           /* might longjmp */
 305           what = scm_module_lookup (mod, SCM_CADR (what));
 306         }
 307
 308       if (!VARIABLE_BOUNDP (what))
 309         {
 310           finish_args = SCM_LIST1 (what);
 311           goto vm_error_unbound;
 312         }
 313
 314       OBJECT_SET (objnum, what);
 315     }
 316
 317   PUSH (VARIABLE_REF (what));
 318   NEXT;
 319 }
 320
 321 /* set */
 322
 323 VM_DEFINE_INSTRUCTION (26, local_set, "local-set", 1, 1, 0)
 324 {
 325   LOCAL_SET (FETCH (), *sp);
 326   DROP ();
 327   NEXT;
 328 }
 329
 330 VM_DEFINE_INSTRUCTION (27, external_set, "external-set", 1, 1, 0)
 331 {
 332   unsigned int i;
 333   SCM e = external;
 334   for (i = FETCH (); i; i--)
 335     {
 336       CHECK_EXTERNAL(e);
 337       e = SCM_CDR (e);
 338     }
 339   CHECK_EXTERNAL(e);
 340   SCM_SETCAR (e, *sp);
 341   DROP ();
 342   NEXT;
 343 }
 344
 345 VM_DEFINE_INSTRUCTION (28, variable_set, "variable-set", 0, 1, 0)
 346 {
 347   VARIABLE_SET (sp[0], sp[-1]);
 348   DROPN (2);
 349   NEXT;
 350 }
 351
 352 VM_DEFINE_INSTRUCTION (29, toplevel_set, "toplevel-set", 1, 1, 0)
 353 {
 354   unsigned objnum = FETCH ();
 355   SCM what;
 356   CHECK_OBJECT (objnum);
 357   what = OBJECT_REF (objnum);
 358
 359   if (!SCM_VARIABLEP (what))
 360     {
 361       SYNC_BEFORE_GC ();
 362       if (SCM_LIKELY (SCM_SYMBOLP (what)))
 363         {
 364           SCM mod = SCM_EOL;
 365           if (SCM_LIKELY (scm_module_system_booted_p
 366                           && scm_is_true ((mod = scm_program_module (program)))))
 367             /* might longjmp */
 368             what = scm_module_lookup (mod, what);
 369           else
 370             what = scm_sym2var (what, SCM_BOOL_F, SCM_BOOL_F);
 371         }
 372       else
 373         {
 374           SCM mod;
 375           /* compilation of @ or @@
 376              `what' is a three-element list: (MODNAME SYM INTERFACE?)
 377              INTERFACE? is #t if we compiled @ or #f if we compiled @@
 378           */
 379           mod = scm_resolve_module (SCM_CAR (what));
 380           if (scm_is_true (SCM_CADDR (what)))
 381             mod = scm_module_public_interface (mod);
 382           if (SCM_FALSEP (mod))
 383             {
 384               finish_args = SCM_LIST1 (what);
 385               goto vm_error_no_such_module;
 386             }
 387           /* might longjmp */
 388           what = scm_module_lookup (mod, SCM_CADR (what));
 389         }
 390
 391       OBJECT_SET (objnum, what);
 392     }
 393
 394   VARIABLE_SET (what, *sp);
 395   DROP ();
 396   NEXT;
 397 }
 398
 399 VM_DEFINE_INSTRUCTION (30, externals, "externals", 0, 0, 1)
 400 {
 401   PUSH (external);
 402   NEXT;
 403 }
 404
 405 \f
 406 /*
 407  * branch and jump
 408  */
 409
 410 /* offset must be a signed short!!! */
 411 #define FETCH_OFFSET(offset)                    \
 412 {                                               \
 413   int h = FETCH ();                             \
 414   int l = FETCH ();                             \
 415   offset = (h << 8) + l;                        \
 416 }
 417
 418 #define BR(p)                                   \
 419 {                                               \
 420   signed short offset;                          \
 421   FETCH_OFFSET (offset);                        \
 422   if (p)                                        \
 423     ip += offset;                               \
 424   NULLSTACK (1);                                \
 425   DROP ();                                      \
 426   NEXT;                                         \
 427 }
 428
 429 VM_DEFINE_INSTRUCTION (31, br, "br", 2, 0, 0)
 430 {
 431   int h = FETCH ();
 432   int l = FETCH ();
 433   ip += (signed short) (h << 8) + l;
 434   NEXT;
 435 }
 436
 437 VM_DEFINE_INSTRUCTION (32, br_if, "br-if", 2, 0, 0)
 438 {
 439   BR (!SCM_FALSEP (*sp));
 440 }
 441
 442 VM_DEFINE_INSTRUCTION (33, br_if_not, "br-if-not", 2, 0, 0)
 443 {
 444   BR (SCM_FALSEP (*sp));
 445 }
 446
 447 VM_DEFINE_INSTRUCTION (34, br_if_eq, "br-if-eq", 2, 0, 0)
 448 {
 449   BR (SCM_EQ_P (sp[0], sp--[1]));
 450 }
 451
 452 VM_DEFINE_INSTRUCTION (35, br_if_not_eq, "br-if-not-eq", 2, 0, 0)
 453 {
 454   BR (!SCM_EQ_P (sp[0], sp--[1]));
 455 }
 456
 457 VM_DEFINE_INSTRUCTION (36, br_if_null, "br-if-null", 2, 0, 0)
 458 {
 459   BR (SCM_NULLP (*sp));
 460 }
 461
 462 VM_DEFINE_INSTRUCTION (37, br_if_not_null, "br-if-not-null", 2, 0, 0)
 463 {
 464   BR (!SCM_NULLP (*sp));
 465 }
 466
 467 \f
 468 /*
 469  * Subprogram call
 470  */
 471
 472 VM_DEFINE_INSTRUCTION (38, make_closure, "make-closure", 0, 1, 1)
 473 {
 474   SYNC_BEFORE_GC ();
 475   SCM_NEWSMOB3 (*sp, scm_tc16_program, SCM_PROGRAM_OBJCODE (*sp),
 476                 SCM_PROGRAM_OBJTABLE (*sp), external);
 477   NEXT;
 478 }
 479
 480 VM_DEFINE_INSTRUCTION (39, call, "call", 1, -1, 1)
 481 {
 482   SCM x;
 483   nargs = FETCH ();
 484
 485  vm_call:
 486   x = sp[-nargs];
 487
 488   SYNC_REGISTER ();
 489   SCM_TICK;     /* allow interrupt here */
 490
 491   /*
 492    * Subprogram call
 493    */
 494   if (SCM_PROGRAM_P (x))
 495     {
 496       program = x;
 497       CACHE_PROGRAM ();
 498       INIT_ARGS ();
 499       NEW_FRAME ();
 500       ENTER_HOOK ();
 501       APPLY_HOOK ();
 502       NEXT;
 503     }
 504 #ifdef ENABLE_TRAMPOLINE
 505   /* Seems to slow down the fibo test, dunno why */
 506   /*
 507    * Subr call
 508    */
 509   switch (nargs)
 510     {
 511     case 0:
 512       {
 513         scm_t_trampoline_0 call = scm_trampoline_0 (x);
 514         if (call)
 515           {
 516             SYNC_ALL ();
 517             *sp = call (x);
 518             NEXT;
 519           }
 520         break;
 521       }
 522     case 1:
 523       {
 524         scm_t_trampoline_1 call = scm_trampoline_1 (x);
 525         if (call)
 526           {
 527             SCM arg1;
 528             POP (arg1);
 529             SYNC_ALL ();
 530             *sp = call (x, arg1);
 531             NEXT;
 532           }
 533         break;
 534       }
 535     case 2:
 536       {
 537         scm_t_trampoline_2 call = scm_trampoline_2 (x);
 538         if (call)
 539           {
 540             SCM arg1, arg2;
 541             POP (arg2);
 542             POP (arg1);
 543             SYNC_ALL ();
 544             *sp = call (x, arg1, arg2);
 545             NEXT;
 546           }
 547         break;
 548       }
 549     }
 550 #endif
 551   /*
 552    * Other interpreted or compiled call
 553    */
 554   if (!SCM_FALSEP (scm_procedure_p (x)))
 555     {
 556       /* At this point, the stack contains the procedure and each one of its
 557          arguments.  */
 558       POP_LIST (nargs);
 559       SYNC_REGISTER ();
 560       /* keep args on stack so they are marked */
 561       sp[-1] = scm_apply (x, sp[0], SCM_EOL);
 562       NULLSTACK_FOR_NONLOCAL_EXIT ();
 563       DROP ();
 564       if (SCM_UNLIKELY (SCM_VALUESP (*sp)))
 565         {
 566           /* truncate values */
 567           SCM values;
 568           POP (values);
 569           values = scm_struct_ref (values, SCM_INUM0);
 570           if (scm_is_null (values))
 571             goto vm_error_not_enough_values;
 572           PUSH (SCM_CAR (values));
 573         }
 574       NEXT;
 575     }
 576   /*
 577    * Continuation call
 578    */
 579   if (SCM_VM_CONT_P (x))
 580     {
 581       program = x;
 582     vm_call_continuation:
 583       /* Check the number of arguments */
 584       /* FIXME multiple args */
 585       if (nargs != 1)
 586         scm_wrong_num_args (program);
 587
 588       /* Reinstate the continuation */
 589       EXIT_HOOK ();
 590       reinstate_vm_cont (vp, program);
 591       CACHE_REGISTER ();
 592       program = SCM_FRAME_PROGRAM (fp);
 593       CACHE_PROGRAM ();
 594       NEXT;
 595     }
 596
 597   program = x;
 598   goto vm_error_wrong_type_apply;
 599 }
 600
 601 VM_DEFINE_INSTRUCTION (40, goto_args, "goto/args", 1, -1, 1)
 602 {
 603   register SCM x;
 604   nargs = FETCH ();
 605  vm_goto_args:
 606   x = sp[-nargs];
 607
 608   SYNC_REGISTER ();
 609   SCM_TICK;     /* allow interrupt here */
 610
 611   /*
 612    * Tail recursive call
 613    */
 614   if (SCM_EQ_P (x, program))
 615     {
 616       int i;
 617
 618       /* Move arguments */
 619       INIT_ARGS ();
 620       sp -= bp->nargs - 1;
 621       for (i = 0; i < bp->nargs; i++)
 622         LOCAL_SET (i, sp[i]);
 623
 624       /* Drop the first argument and the program itself.  */
 625       sp -= 2;
 626       NULLSTACK (bp->nargs + 1);
 627
 628       /* Freshen the externals */
 629       external = SCM_PROGRAM_EXTERNALS (x);
 630       for (i = 0; i < bp->nexts; i++)
 631         CONS (external, SCM_UNDEFINED, external);
 632       SCM_FRAME_DATA_ADDRESS (fp)[0] = external;
 633
 634       /* Init locals to valid SCM values */
 635       for (i = 0; i < bp->nlocs; i++)
 636         LOCAL_SET (i + bp->nargs, SCM_UNDEFINED);
 637
 638       /* Call itself */
 639       ip = bp->base;
 640       APPLY_HOOK ();
 641       NEXT;
 642     }
 643
 644   /*
 645    * Tail call, but not to self -- reuse the frame, keeping the ra and dl
 646    */
 647   if (SCM_PROGRAM_P (x))
 648     {
 649       SCM *data, *tail_args, *dl;
 650       int i;
 651       scm_byte_t *ra, *mvra;
 652 #ifdef VM_ENABLE_STACK_NULLING
 653       SCM *old_sp;
 654 #endif
 655
 656       EXIT_HOOK ();
 657
 658       /* save registers */
 659       tail_args = stack_base + 2;
 660       ra = SCM_FRAME_RETURN_ADDRESS (fp);
 661       mvra = SCM_FRAME_MV_RETURN_ADDRESS (fp);
 662       dl = SCM_FRAME_DYNAMIC_LINK (fp);
 663
 664       /* switch programs */
 665       program = x;
 666       CACHE_PROGRAM ();
 667       INIT_ARGS ();
 668       /* delay updating the frame so that if INIT_ARGS has to cons up a rest
 669          arg, going into GC, the stack still makes sense */
 670       fp[-1] = program;
 671       nargs = bp->nargs;
 672
 673 #ifdef VM_ENABLE_STACK_NULLING
 674       old_sp = sp;
 675       CHECK_STACK_LEAK ();
 676 #endif
 677
 678       /* new registers -- logically this would be better later, but let's make
 679          sure we have space for the locals now */
 680       data = SCM_FRAME_DATA_ADDRESS (fp);
 681       ip = bp->base;
 682       stack_base = data + 3;
 683       sp = stack_base;
 684       CHECK_OVERFLOW ();
 685
 686       /* copy args, bottom-up */
 687       for (i = 0; i < nargs; i++)
 688         fp[i] = tail_args[i];
 689
 690       NULLSTACK (old_sp - sp);
 691
 692       /* init locals */
 693       for (i = bp->nlocs; i; i--)
 694         data[-i] = SCM_UNDEFINED;
 695
 696       /* Set frame data */
 697       data[3] = (SCM)ra;
 698       data[2] = (SCM)mvra;
 699       data[1] = (SCM)dl;
 700
 701       /* Postpone initializing external vars, because if the CONS causes a GC,
 702          we want the stack marker to see the data array formatted as expected. */
 703       data[0] = SCM_UNDEFINED;
 704       external = SCM_PROGRAM_EXTERNALS (fp[-1]);
 705       for (i = 0; i < bp->nexts; i++)
 706         CONS (external, SCM_UNDEFINED, external);
 707       data[0] = external;
 708
 709       ENTER_HOOK ();
 710       APPLY_HOOK ();
 711       NEXT;
 712     }
 713 #ifdef ENABLE_TRAMPOLINE
 714   /* This seems to actually slow down the fibo test -- dunno why */
 715   /*
 716    * Subr call
 717    */
 718   switch (nargs)
 719     {
 720     case 0:
 721       {
 722         scm_t_trampoline_0 call = scm_trampoline_0 (x);
 723         if (call)
 724           {
 725             SYNC_ALL ();
 726             *sp = call (x);
 727             goto vm_return;
 728           }
 729         break;
 730       }
 731     case 1:
 732       {
 733         scm_t_trampoline_1 call = scm_trampoline_1 (x);
 734         if (call)
 735           {
 736             SCM arg1;
 737             POP (arg1);
 738             SYNC_ALL ();
 739             *sp = call (x, arg1);
 740             goto vm_return;
 741           }
 742         break;
 743       }
 744     case 2:
 745       {
 746         scm_t_trampoline_2 call = scm_trampoline_2 (x);
 747         if (call)
 748           {
 749             SCM arg1, arg2;
 750             POP (arg2);
 751             POP (arg1);
 752             SYNC_ALL ();
 753             *sp = call (x, arg1, arg2);
 754             goto vm_return;
 755           }
 756         break;
 757       }
 758     }
 759 #endif
 760
 761   /*
 762    * Other interpreted or compiled call
 763    */
 764   if (!SCM_FALSEP (scm_procedure_p (x)))
 765     {
 766       POP_LIST (nargs);
 767       SYNC_REGISTER ();
 768       sp[-1] = scm_apply (x, sp[0], SCM_EOL);
 769       NULLSTACK_FOR_NONLOCAL_EXIT ();
 770       DROP ();
 771       if (SCM_UNLIKELY (SCM_VALUESP (*sp)))
 772         {
 773           /* multiple values returned to continuation */
 774           SCM values;
 775           POP (values);
 776           values = scm_struct_ref (values, SCM_INUM0);
 777           nvalues = scm_ilength (values);
 778           PUSH_LIST (values, SCM_NULLP);
 779           goto vm_return_values;
 780         }
 781       goto vm_return;
 782     }
 783
 784   program = x;
 785
 786   /*
 787    * Continuation call
 788    */
 789   if (SCM_VM_CONT_P (program))
 790     goto vm_call_continuation;
 791
 792   goto vm_error_wrong_type_apply;
 793 }
 794
 795 VM_DEFINE_INSTRUCTION (41, goto_nargs, "goto/nargs", 0, 0, 1)
 796 {
 797   SCM x;
 798   POP (x);
 799   nargs = scm_to_int (x);
 800   /* FIXME: should truncate values? */
 801   goto vm_goto_args;
 802 }
 803
 804 VM_DEFINE_INSTRUCTION (42, call_nargs, "call/nargs", 0, 0, 1)
 805 {
 806   SCM x;
 807   POP (x);
 808   nargs = scm_to_int (x);
 809   /* FIXME: should truncate values? */
 810   goto vm_call;
 811 }
 812
 813 VM_DEFINE_INSTRUCTION (43, mv_call, "mv-call", 3, -1, 1)
 814 {
 815   SCM x;
 816   signed short offset;
 817
 818   nargs = FETCH ();
 819   FETCH_OFFSET (offset);
 820
 821   x = sp[-nargs];
 822
 823   /*
 824    * Subprogram call
 825    */
 826   if (SCM_PROGRAM_P (x))
 827     {
 828       program = x;
 829       CACHE_PROGRAM ();
 830       INIT_ARGS ();
 831       NEW_FRAME ();
 832       SCM_FRAME_DATA_ADDRESS (fp)[2] = (SCM)(SCM_FRAME_RETURN_ADDRESS (fp) + offset);
 833       ENTER_HOOK ();
 834       APPLY_HOOK ();
 835       NEXT;
 836     }
 837   /*
 838    * Other interpreted or compiled call
 839    */
 840   if (!SCM_FALSEP (scm_procedure_p (x)))
 841     {
 842       /* At this point, the stack contains the procedure and each one of its
 843          arguments.  */
 844       POP_LIST (nargs);
 845       SYNC_REGISTER ();
 846       sp[-1] = scm_apply (x, sp[0], SCM_EOL);
 847       NULLSTACK_FOR_NONLOCAL_EXIT ();
 848       DROP ();
 849       if (SCM_VALUESP (*sp))
 850         {
 851           SCM values, len;
 852           POP (values);
 853           values = scm_struct_ref (values, SCM_INUM0);
 854           len = scm_length (values);
 855           PUSH_LIST (values, SCM_NULLP);
 856           PUSH (len);
 857           ip += offset;
 858         }
 859       NEXT;
 860     }
 861   /*
 862    * Continuation call
 863    */
 864   if (SCM_VM_CONT_P (x))
 865     {
 866       program = x;
 867       goto vm_call_continuation;
 868     }
 869
 870   program = x;
 871   goto vm_error_wrong_type_apply;
 872 }
 873
 874 VM_DEFINE_INSTRUCTION (44, apply, "apply", 1, -1, 1)
 875 {
 876   int len;
 877   SCM ls;
 878   POP (ls);
 879
 880   nargs = FETCH ();
 881   ASSERT (nargs >= 2);
 882
 883   len = scm_ilength (ls);
 884   if (len < 0)
 885     goto vm_error_wrong_type_arg;
 886
 887   PUSH_LIST (ls, SCM_NULL_OR_NIL_P);
 888
 889   nargs += len - 2;
 890   goto vm_call;
 891 }
 892
 893 VM_DEFINE_INSTRUCTION (45, goto_apply, "goto/apply", 1, -1, 1)
 894 {
 895   int len;
 896   SCM ls;
 897   POP (ls);
 898
 899   nargs = FETCH ();
 900   ASSERT (nargs >= 2);
 901
 902   len = scm_ilength (ls);
 903   if (len < 0)
 904     goto vm_error_wrong_type_arg;
 905
 906   PUSH_LIST (ls, SCM_NULL_OR_NIL_P);
 907
 908   nargs += len - 2;
 909   goto vm_goto_args;
 910 }
 911
 912 VM_DEFINE_INSTRUCTION (46, call_cc, "call/cc", 0, 1, 1)
 913 {
 914   int first;
 915   SCM proc, cont;
 916   POP (proc);
 917   SYNC_ALL ();
 918   cont = scm_make_continuation (&first);
 919   if (first)
 920     {
 921       PUSH (proc);
 922       PUSH (cont);
 923       nargs = 1;
 924       goto vm_call;
 925     }
 926   ASSERT (sp == vp->sp);
 927   ASSERT (fp == vp->fp);
 928   else if (SCM_VALUESP (cont))
 929     {
 930       /* multiple values returned to continuation */
 931       SCM values;
 932       values = scm_struct_ref (cont, SCM_INUM0);
 933       if (SCM_NULLP (values))
 934         goto vm_error_no_values;
 935       /* non-tail context does not accept multiple values? */
 936       PUSH (SCM_CAR (values));
 937       NEXT;
 938     }
 939   else
 940     {
 941       PUSH (cont);
 942       NEXT;
 943     }
 944 }
 945
 946 VM_DEFINE_INSTRUCTION (47, goto_cc, "goto/cc", 0, 1, 1)
 947 {
 948   int first;
 949   SCM proc, cont;
 950   POP (proc);
 951   SYNC_ALL ();
 952   cont = scm_make_continuation (&first);
 953   ASSERT (sp == vp->sp);
 954   ASSERT (fp == vp->fp);
 955   if (first)
 956     {
 957       PUSH (proc);
 958       PUSH (cont);
 959       nargs = 1;
 960       goto vm_goto_args;
 961     }
 962   else if (SCM_VALUESP (cont))
 963     {
 964       /* multiple values returned to continuation */
 965       SCM values;
 966       values = scm_struct_ref (cont, SCM_INUM0);
 967       nvalues = scm_ilength (values);
 968       PUSH_LIST (values, SCM_NULLP);
 969       goto vm_return_values;
 970     }
 971   else
 972     {
 973       PUSH (cont);
 974       goto vm_return;
 975     }
 976 }
 977
 978 VM_DEFINE_INSTRUCTION (48, return, "return", 0, 1, 1)
 979 {
 980  vm_return:
 981   EXIT_HOOK ();
 982   RETURN_HOOK ();
 983   SYNC_REGISTER ();
 984   SCM_TICK;     /* allow interrupt here */
 985   {
 986     SCM ret, *data;
 987     data = SCM_FRAME_DATA_ADDRESS (fp);
 988
 989     POP (ret);
 990     ASSERT (sp == stack_base);
 991     ASSERT (stack_base == data + 3);
 992
 993     /* Restore registers */
 994     sp = SCM_FRAME_LOWER_ADDRESS (fp);
 995     ip = SCM_FRAME_BYTE_CAST (data[3]);
 996     fp = SCM_FRAME_STACK_CAST (data[1]);
 997     {
 998 #ifdef VM_ENABLE_STACK_NULLING
 999       int nullcount = stack_base - sp;
1000 #endif
1001       stack_base = SCM_FRAME_UPPER_ADDRESS (fp) - 1;
1002       NULLSTACK (nullcount);
1003     }
1004
1005     /* Set return value (sp is already pushed) */
1006     *sp = ret;
1007   }
1008
1009   /* Restore the last program */
1010   program = SCM_FRAME_PROGRAM (fp);
1011   CACHE_PROGRAM ();
1012   CACHE_EXTERNAL ();
1013   CHECK_IP ();
1014   NEXT;
1015 }
1016
1017 VM_DEFINE_INSTRUCTION (49, return_values, "return/values", 1, -1, -1)
1018 {
1019   /* nvalues declared at top level, because for some reason gcc seems to think
1020      that perhaps it might be used without declaration. Fooey to that, I say. */
1021   SCM *data;
1022
1023   nvalues = FETCH ();
1024  vm_return_values:
1025   EXIT_HOOK ();
1026   RETURN_HOOK ();
1027
1028   data = SCM_FRAME_DATA_ADDRESS (fp);
1029   ASSERT (stack_base == data + 3);
1030
1031   /* data[2] is the mv return address */
1032   if (nvalues != 1 && data[2])
1033     {
1034       int i;
1035       /* Restore registers */
1036       sp = SCM_FRAME_LOWER_ADDRESS (fp) - 1;
1037       ip = SCM_FRAME_BYTE_CAST (data[2]); /* multiple value ra */
1038       fp = SCM_FRAME_STACK_CAST (data[1]);
1039
1040       /* Push return values, and the number of values */
1041       for (i = 0; i < nvalues; i++)
1042         *++sp = stack_base[1+i];
1043       *++sp = SCM_I_MAKINUM (nvalues);
1044
1045       /* Finally set new stack_base */
1046       NULLSTACK (stack_base - sp + nvalues + 1);
1047       stack_base = SCM_FRAME_UPPER_ADDRESS (fp) - 1;
1048     }
1049   else if (nvalues >= 1)
1050     {
1051       /* Multiple values for a single-valued continuation -- here's where I
1052          break with guile tradition and try and do something sensible. (Also,
1053          this block handles the single-valued return to an mv
1054          continuation.) */
1055       /* Restore registers */
1056       sp = SCM_FRAME_LOWER_ADDRESS (fp) - 1;
1057       ip = SCM_FRAME_BYTE_CAST (data[3]); /* single value ra */
1058       fp = SCM_FRAME_STACK_CAST (data[1]);
1059
1060       /* Push first value */
1061       *++sp = stack_base[1];
1062
1063       /* Finally set new stack_base */
1064       NULLSTACK (stack_base - sp + nvalues + 1);
1065       stack_base = SCM_FRAME_UPPER_ADDRESS (fp) - 1;
1066     }
1067   else
1068     goto vm_error_no_values;
1069
1070   /* Restore the last program */
1071   program = SCM_FRAME_PROGRAM (fp);
1072   CACHE_PROGRAM ();
1073   CACHE_EXTERNAL ();
1074   CHECK_IP ();
1075   NEXT;
1076 }
1077
1078 VM_DEFINE_INSTRUCTION (50, return_values_star, "return/values*", 1, -1, -1)
1079 {
1080   SCM l;
1081
1082   nvalues = FETCH ();
1083   ASSERT (nvalues >= 1);
1084
1085   nvalues--;
1086   POP (l);
1087   while (SCM_CONSP (l))
1088     {
1089       PUSH (SCM_CAR (l));
1090       l = SCM_CDR (l);
1091       nvalues++;
1092     }
1093   if (SCM_UNLIKELY (!SCM_NULL_OR_NIL_P (l))) {
1094     finish_args = scm_list_1 (l);
1095     goto vm_error_improper_list;
1096   }
1097
1098   goto vm_return_values;
1099 }
1100
1101 VM_DEFINE_INSTRUCTION (51, truncate_values, "truncate-values", 2, -1, -1)
1102 {
1103   SCM x;
1104   int nbinds, rest;
1105   POP (x);
1106   nvalues = scm_to_int (x);
1107   nbinds = FETCH ();
1108   rest = FETCH ();
1109
1110   if (rest)
1111     nbinds--;
1112
1113   if (nvalues < nbinds)
1114     goto vm_error_not_enough_values;
1115
1116   if (rest)
1117     POP_LIST (nvalues - nbinds);
1118   else
1119     DROPN (nvalues - nbinds);
1120
1121   NEXT;
1122 }
1123
1124 /*
1125 (defun renumber-ops ()
1126   "start from top of buffer and renumber 'VM_DEFINE_FOO (\n' sequences"
1127   (interactive "")
1128   (save-excursion
1129     (let ((counter -1)) (goto-char (point-min))
1130       (while (re-search-forward "^VM_DEFINE_[^ ]+ (\\([^,]+\\)," (point-max) t)
1131         (replace-match
1132          (number-to-string (setq counter (1+ counter)))
1133           t t nil 1)))))
1134 */
1135 /*
1136   Local Variables:
1137   c-file-style: "gnu"
1138   End:
1139 */