libguile/vm-i-scheme.c

   1 /* Copyright (C) 2001, 2009, 2010, 2011, 2012, 2013 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 /* This file is included in vm_engine.c */
  20
  21 \f
  22 /*
  23  * Predicates
  24  */
  25
  26 #define ARGS1(a1)       SCM a1 = sp[0];
  27 #define ARGS2(a1,a2)    SCM a1 = sp[-1], a2 = sp[0]; sp--; NULLSTACK (1);
  28 #define ARGS3(a1,a2,a3) SCM a1 = sp[-2], a2 = sp[-1], a3 = sp[0]; sp -= 2; NULLSTACK (2);
  29
  30 #define RETURN(x)       do { *sp = x; NEXT; } while (0)
  31
  32 VM_DEFINE_FUNCTION (128, not, "not", 1)
  33 {
  34   ARGS1 (x);
  35   RETURN (scm_from_bool (scm_is_false (x)));
  36 }
  37
  38 VM_DEFINE_FUNCTION (129, not_not, "not-not", 1)
  39 {
  40   ARGS1 (x);
  41   RETURN (scm_from_bool (!scm_is_false (x)));
  42 }
  43
  44 VM_DEFINE_FUNCTION (130, eq, "eq?", 2)
  45 {
  46   ARGS2 (x, y);
  47   RETURN (scm_from_bool (scm_is_eq (x, y)));
  48 }
  49
  50 VM_DEFINE_FUNCTION (131, not_eq, "not-eq?", 2)
  51 {
  52   ARGS2 (x, y);
  53   RETURN (scm_from_bool (!scm_is_eq (x, y)));
  54 }
  55
  56 VM_DEFINE_FUNCTION (132, nullp, "null?", 1)
  57 {
  58   ARGS1 (x);
  59   RETURN (scm_from_bool (scm_is_null (x)));
  60 }
  61
  62 VM_DEFINE_FUNCTION (133, not_nullp, "not-null?", 1)
  63 {
  64   ARGS1 (x);
  65   RETURN (scm_from_bool (!scm_is_null (x)));
  66 }
  67
  68 VM_DEFINE_FUNCTION (134, eqv, "eqv?", 2)
  69 {
  70   ARGS2 (x, y);
  71   if (scm_is_eq (x, y))
  72     RETURN (SCM_BOOL_T);
  73   if (SCM_IMP (x) || SCM_IMP (y))
  74     RETURN (SCM_BOOL_F);
  75   SYNC_REGISTER ();
  76   RETURN (scm_eqv_p (x, y));
  77 }
  78
  79 VM_DEFINE_FUNCTION (135, equal, "equal?", 2)
  80 {
  81   ARGS2 (x, y);
  82   if (scm_is_eq (x, y))
  83     RETURN (SCM_BOOL_T);
  84   if (SCM_IMP (x) || SCM_IMP (y))
  85     RETURN (SCM_BOOL_F);
  86   SYNC_REGISTER ();
  87   RETURN (scm_equal_p (x, y));
  88 }
  89
  90 VM_DEFINE_FUNCTION (136, pairp, "pair?", 1)
  91 {
  92   ARGS1 (x);
  93   RETURN (scm_from_bool (scm_is_pair (x)));
  94 }
  95
  96 VM_DEFINE_FUNCTION (137, listp, "list?", 1)
  97 {
  98   ARGS1 (x);
  99   RETURN (scm_from_bool (scm_ilength (x) >= 0));
 100 }
 101
 102 VM_DEFINE_FUNCTION (138, symbolp, "symbol?", 1)
 103 {
 104   ARGS1 (x);
 105   RETURN (scm_from_bool (scm_is_symbol (x)));
 106 }
 107
 108 VM_DEFINE_FUNCTION (139, vectorp, "vector?", 1)
 109 {
 110   ARGS1 (x);
 111   RETURN (scm_from_bool (SCM_I_IS_VECTOR (x)));
 112 }
 113
 114 \f
 115 /*
 116  * Basic data
 117  */
 118
 119 VM_DEFINE_FUNCTION (140, cons, "cons", 2)
 120 {
 121   ARGS2 (x, y);
 122   CONS (x, x, y);
 123   RETURN (x);
 124 }
 125
 126 #define VM_VALIDATE_CONS(x, proc)               \
 127   VM_ASSERT (scm_is_pair (x), vm_error_not_a_pair (proc, x))
 128
 129 VM_DEFINE_FUNCTION (141, car, "car", 1)
 130 {
 131   ARGS1 (x);
 132   VM_VALIDATE_CONS (x, "car");
 133   RETURN (SCM_CAR (x));
 134 }
 135
 136 VM_DEFINE_FUNCTION (142, cdr, "cdr", 1)
 137 {
 138   ARGS1 (x);
 139   VM_VALIDATE_CONS (x, "cdr");
 140   RETURN (SCM_CDR (x));
 141 }
 142
 143 VM_DEFINE_INSTRUCTION (143, set_car, "set-car!", 0, 2, 0)
 144 {
 145   SCM x, y;
 146   POP2 (y, x);
 147   VM_VALIDATE_CONS (x, "set-car!");
 148   SCM_SETCAR (x, y);
 149   NEXT;
 150 }
 151
 152 VM_DEFINE_INSTRUCTION (144, set_cdr, "set-cdr!", 0, 2, 0)
 153 {
 154   SCM x, y;
 155   POP2 (y, x);
 156   VM_VALIDATE_CONS (x, "set-cdr!");
 157   SCM_SETCDR (x, y);
 158   NEXT;
 159 }
 160
 161 \f
 162 /*
 163  * Numeric relational tests
 164  */
 165
 166 #undef REL
 167 #define REL(crel,srel)                                                  \
 168   {                                                                     \
 169     ARGS2 (x, y);                                                       \
 170     if (SCM_I_INUMP (x) && SCM_I_INUMP (y))                             \
 171       RETURN (scm_from_bool (((scm_t_signed_bits) SCM_UNPACK (x))       \
 172                              crel ((scm_t_signed_bits) SCM_UNPACK (y)))); \
 173     SYNC_REGISTER ();                                                   \
 174     RETURN (srel (x, y));                                               \
 175   }
 176
 177 VM_DEFINE_FUNCTION (145, ee, "ee?", 2)
 178 {
 179   REL (==, scm_num_eq_p);
 180 }
 181
 182 VM_DEFINE_FUNCTION (146, lt, "lt?", 2)
 183 {
 184   REL (<, scm_less_p);
 185 }
 186
 187 VM_DEFINE_FUNCTION (147, le, "le?", 2)
 188 {
 189   REL (<=, scm_leq_p);
 190 }
 191
 192 VM_DEFINE_FUNCTION (148, gt, "gt?", 2)
 193 {
 194   REL (>, scm_gr_p);
 195 }
 196
 197 VM_DEFINE_FUNCTION (149, ge, "ge?", 2)
 198 {
 199   REL (>=, scm_geq_p);
 200 }
 201
 202 \f
 203 /*
 204  * Numeric functions
 205  */
 206
 207 /* The maximum/minimum tagged integers.  */
 208 #undef INUM_MAX
 209 #undef INUM_MIN
 210 #undef INUM_STEP
 211 #define INUM_MAX  \
 212   ((scm_t_signed_bits) SCM_UNPACK (SCM_I_MAKINUM (SCM_MOST_POSITIVE_FIXNUM)))
 213 #define INUM_MIN  \
 214   ((scm_t_signed_bits) SCM_UNPACK (SCM_I_MAKINUM (SCM_MOST_NEGATIVE_FIXNUM)))
 215 #define INUM_STEP                                \
 216   ((scm_t_signed_bits) SCM_UNPACK (SCM_INUM1)    \
 217    - (scm_t_signed_bits) SCM_UNPACK (SCM_INUM0))
 218
 219 #undef FUNC2
 220 #define FUNC2(CFUNC,SFUNC)                              \
 221 {                                                       \
 222   ARGS2 (x, y);                                         \
 223   if (SCM_I_INUMP (x) && SCM_I_INUMP (y))               \
 224     {                                                   \
 225       scm_t_int64 n = SCM_I_INUM (x) CFUNC SCM_I_INUM (y);\
 226       if (SCM_FIXABLE (n))                              \
 227         RETURN (SCM_I_MAKINUM (n));                     \
 228     }                                                   \
 229   SYNC_REGISTER ();                                     \
 230   RETURN (SFUNC (x, y));                                \
 231 }
 232
 233 /* Assembly tagged integer arithmetic routines.  This code uses the
 234    `asm goto' feature introduced in GCC 4.5.  */
 235
 236 #if SCM_GNUC_PREREQ (4, 5) && (defined __x86_64__ || defined __i386__)
 237
 238 # undef _CX
 239 # ifdef __x86_64__
 240 #  define _CX "rcx"
 241 # else
 242 #  define _CX "ecx"
 243 # endif
 244
 245 /* The macros below check the CPU's overflow flag to improve fixnum
 246    arithmetic.  The _CX register (%rcx or %ecx) is explicitly
 247    clobbered because `asm goto' can't have outputs, in which case the
 248    `r' constraint could be used to let the register allocator choose a
 249    register.
 250
 251    TODO: Use `cold' label attribute in GCC 4.6.
 252    http://gcc.gnu.org/ml/gcc-patches/2010-10/msg01777.html  */
 253
 254 # define ASM_ADD(x, y)                                                  \
 255     {                                                                   \
 256       asm volatile goto ("mov %1, %%"_CX"; "                            \
 257                          "test %[tag], %%cl;   je %l[slow_add]; "       \
 258                          "test %[tag], %0;     je %l[slow_add]; "       \
 259                          "sub %[tag], %%"_CX"; "                        \
 260                          "add %0, %%"_CX";     jo %l[slow_add]; "       \
 261                          "mov %%"_CX", (%[vsp])\n"                      \
 262                          : /* no outputs */                             \
 263                          : "r" (x), "r" (y),                            \
 264                            [vsp] "r" (sp), [tag] "i" (scm_tc2_int)      \
 265                          : "rcx", "memory", "cc"                        \
 266                          : slow_add);                                   \
 267       NEXT;                                                             \
 268     }                                                                   \
 269   slow_add:                                                             \
 270     do { } while (0)
 271
 272 # define ASM_SUB(x, y)                                                  \
 273     {                                                                   \
 274       asm volatile goto ("mov %0, %%"_CX"; "                            \
 275                          "test %[tag], %%cl;   je %l[slow_sub]; "       \
 276                          "test %[tag], %1;     je %l[slow_sub]; "       \
 277                          "sub %1, %%"_CX";     jo %l[slow_sub]; "       \
 278                          "add %[tag], %%"_CX"; "                        \
 279                          "mov %%"_CX", (%[vsp])\n"                      \
 280                          : /* no outputs */                             \
 281                          : "r" (x), "r" (y),                            \
 282                            [vsp] "r" (sp), [tag] "i" (scm_tc2_int)      \
 283                          : "rcx", "memory", "cc"                        \
 284                          : slow_sub);                                   \
 285       NEXT;                                                             \
 286     }                                                                   \
 287   slow_sub:                                                             \
 288     do { } while (0)
 289
 290 #endif
 291
 292
 293 VM_DEFINE_FUNCTION (150, add, "add", 2)
 294 {
 295 #ifndef ASM_ADD
 296   FUNC2 (+, scm_sum);
 297 #else
 298   ARGS2 (x, y);
 299   ASM_ADD (x, y);
 300   SYNC_REGISTER ();
 301   RETURN (scm_sum (x, y));
 302 #endif
 303 }
 304
 305 VM_DEFINE_FUNCTION (151, add1, "add1", 1)
 306 {
 307   ARGS1 (x);
 308
 309   /* Check for overflow.  We must avoid overflow in the signed
 310      addition below, even if X is not an inum.  */
 311   if (SCM_LIKELY ((scm_t_signed_bits) SCM_UNPACK (x) <= INUM_MAX - INUM_STEP))
 312     {
 313       SCM result;
 314
 315       /* Add 1 to the integer without untagging.  */
 316       result = SCM_PACK ((scm_t_signed_bits) SCM_UNPACK (x) + INUM_STEP);
 317
 318       if (SCM_LIKELY (SCM_I_INUMP (result)))
 319         RETURN (result);
 320     }
 321
 322   SYNC_REGISTER ();
 323   RETURN (scm_sum (x, SCM_I_MAKINUM (1)));
 324 }
 325
 326 VM_DEFINE_FUNCTION (152, sub, "sub", 2)
 327 {
 328 #ifndef ASM_SUB
 329   FUNC2 (-, scm_difference);
 330 #else
 331   ARGS2 (x, y);
 332   ASM_SUB (x, y);
 333   SYNC_REGISTER ();
 334   RETURN (scm_difference (x, y));
 335 #endif
 336 }
 337
 338 VM_DEFINE_FUNCTION (153, sub1, "sub1", 1)
 339 {
 340   ARGS1 (x);
 341
 342   /* Check for overflow.  We must avoid overflow in the signed
 343      subtraction below, even if X is not an inum.  */
 344   if (SCM_LIKELY ((scm_t_signed_bits) SCM_UNPACK (x) >= INUM_MIN + INUM_STEP))
 345     {
 346       SCM result;
 347
 348       /* Substract 1 from the integer without untagging.  */
 349       result = SCM_PACK ((scm_t_signed_bits) SCM_UNPACK (x) - INUM_STEP);
 350
 351       if (SCM_LIKELY (SCM_I_INUMP (result)))
 352         RETURN (result);
 353     }
 354
 355   SYNC_REGISTER ();
 356   RETURN (scm_difference (x, SCM_I_MAKINUM (1)));
 357 }
 358
 359 # undef ASM_ADD
 360 # undef ASM_SUB
 361
 362 VM_DEFINE_FUNCTION (154, mul, "mul", 2)
 363 {
 364   ARGS2 (x, y);
 365   SYNC_REGISTER ();
 366   RETURN (scm_product (x, y));
 367 }
 368
 369 VM_DEFINE_FUNCTION (155, div, "div", 2)
 370 {
 371   ARGS2 (x, y);
 372   SYNC_REGISTER ();
 373   RETURN (scm_divide (x, y));
 374 }
 375
 376 VM_DEFINE_FUNCTION (156, quo, "quo", 2)
 377 {
 378   ARGS2 (x, y);
 379   SYNC_REGISTER ();
 380   RETURN (scm_quotient (x, y));
 381 }
 382
 383 VM_DEFINE_FUNCTION (157, rem, "rem", 2)
 384 {
 385   ARGS2 (x, y);
 386   SYNC_REGISTER ();
 387   RETURN (scm_remainder (x, y));
 388 }
 389
 390 VM_DEFINE_FUNCTION (158, mod, "mod", 2)
 391 {
 392   ARGS2 (x, y);
 393   SYNC_REGISTER ();
 394   RETURN (scm_modulo (x, y));
 395 }
 396
 397 VM_DEFINE_FUNCTION (159, ash, "ash", 2)
 398 {
 399   ARGS2 (x, y);
 400   if (SCM_I_INUMP (x) && SCM_I_INUMP (y))
 401     {
 402       if (SCM_I_INUM (y) < 0)
 403         {
 404           /* Right shift, will be a fixnum. */
 405           if (SCM_I_INUM (y) > -SCM_I_FIXNUM_BIT)
 406             RETURN (SCM_I_MAKINUM (SCM_I_INUM (x) >> -SCM_I_INUM (y)));
 407           /* fall through */
 408         }
 409       else
 410         /* Left shift. See comments in scm_ash. */
 411         {
 412           scm_t_signed_bits nn, bits_to_shift;
 413
 414           nn = SCM_I_INUM (x);
 415           bits_to_shift = SCM_I_INUM (y);
 416
 417           if (bits_to_shift < SCM_I_FIXNUM_BIT-1
 418               && ((scm_t_bits)
 419                   (SCM_SRS (nn, (SCM_I_FIXNUM_BIT-1 - bits_to_shift)) + 1)
 420                   <= 1))
 421             RETURN (SCM_I_MAKINUM (nn << bits_to_shift));
 422           /* fall through */
 423         }
 424       /* fall through */
 425     }
 426   SYNC_REGISTER ();
 427   RETURN (scm_ash (x, y));
 428 }
 429
 430 VM_DEFINE_FUNCTION (160, logand, "logand", 2)
 431 {
 432   ARGS2 (x, y);
 433   if (SCM_I_INUMP (x) && SCM_I_INUMP (y))
 434     RETURN (SCM_I_MAKINUM (SCM_I_INUM (x) & SCM_I_INUM (y)));
 435   SYNC_REGISTER ();
 436   RETURN (scm_logand (x, y));
 437 }
 438
 439 VM_DEFINE_FUNCTION (161, logior, "logior", 2)
 440 {
 441   ARGS2 (x, y);
 442   if (SCM_I_INUMP (x) && SCM_I_INUMP (y))
 443     RETURN (SCM_I_MAKINUM (SCM_I_INUM (x) | SCM_I_INUM (y)));
 444   SYNC_REGISTER ();
 445   RETURN (scm_logior (x, y));
 446 }
 447
 448 VM_DEFINE_FUNCTION (162, logxor, "logxor", 2)
 449 {
 450   ARGS2 (x, y);
 451   if (SCM_I_INUMP (x) && SCM_I_INUMP (y))
 452     RETURN (SCM_I_MAKINUM (SCM_I_INUM (x) ^ SCM_I_INUM (y)));
 453   SYNC_REGISTER ();
 454   RETURN (scm_logxor (x, y));
 455 }
 456
 457 \f
 458 /*
 459  * Vectors and arrays
 460  */
 461
 462 VM_DEFINE_FUNCTION (163, vector_ref, "vector-ref", 2)
 463 {
 464   scm_t_signed_bits i = 0;
 465   ARGS2 (vect, idx);
 466   if (SCM_LIKELY (SCM_I_IS_NONWEAK_VECTOR (vect)
 467                   && SCM_I_INUMP (idx)
 468                   && ((i = SCM_I_INUM (idx)) >= 0)
 469                   && i < SCM_I_VECTOR_LENGTH (vect)))
 470     RETURN (SCM_I_VECTOR_ELTS (vect)[i]);
 471   else
 472     {
 473       SYNC_REGISTER ();
 474       RETURN (scm_vector_ref (vect, idx));
 475     }
 476 }
 477
 478 VM_DEFINE_INSTRUCTION (164, vector_set, "vector-set", 0, 3, 0)
 479 {
 480   scm_t_signed_bits i = 0;
 481   SCM vect, idx, val;
 482   POP3 (val, idx, vect);
 483   if (SCM_LIKELY (SCM_I_IS_NONWEAK_VECTOR (vect)
 484                   && SCM_I_INUMP (idx)
 485                   && ((i = SCM_I_INUM (idx)) >= 0)
 486                   && i < SCM_I_VECTOR_LENGTH (vect)))
 487     SCM_I_VECTOR_WELTS (vect)[i] = val;
 488   else
 489     {
 490       SYNC_REGISTER ();
 491       scm_vector_set_x (vect, idx, val);
 492     }
 493   NEXT;
 494 }
 495
 496 VM_DEFINE_INSTRUCTION (165, make_array, "make-array", 3, -1, 1)
 497 {
 498   scm_t_uint32 len;
 499   SCM shape, ret;
 500
 501   len = FETCH ();
 502   len = (len << 8) + FETCH ();
 503   len = (len << 8) + FETCH ();
 504   POP (shape);
 505   SYNC_REGISTER ();
 506   PRE_CHECK_UNDERFLOW (len);
 507   ret = scm_from_contiguous_array (shape, sp - len + 1, len);
 508   DROPN (len);
 509   PUSH (ret);
 510   NEXT;
 511 }
 512
 513 \f
 514 /*
 515  * Structs
 516  */
 517 #define VM_VALIDATE_STRUCT(obj, proc)           \
 518   VM_ASSERT (SCM_STRUCTP (obj), vm_error_not_a_struct (proc, obj))
 519
 520 VM_DEFINE_FUNCTION (166, struct_p, "struct?", 1)
 521 {
 522   ARGS1 (obj);
 523   RETURN (scm_from_bool (SCM_STRUCTP (obj)));
 524 }
 525
 526 VM_DEFINE_FUNCTION (167, struct_vtable, "struct-vtable", 1)
 527 {
 528   ARGS1 (obj);
 529   VM_VALIDATE_STRUCT (obj, "struct_vtable");
 530   RETURN (SCM_STRUCT_VTABLE (obj));
 531 }
 532
 533 VM_DEFINE_INSTRUCTION (168, make_struct, "make-struct", 2, -1, 1)
 534 {
 535   unsigned h = FETCH ();
 536   unsigned l = FETCH ();
 537   scm_t_bits n = ((h << 8U) + l);
 538   SCM vtable = sp[-(n - 1)];
 539   const SCM *inits = sp - n + 2;
 540   SCM ret;
 541
 542   SYNC_REGISTER ();
 543
 544   if (SCM_LIKELY (SCM_STRUCTP (vtable)
 545                   && SCM_VTABLE_FLAG_IS_SET (vtable, SCM_VTABLE_FLAG_SIMPLE)
 546                   && (SCM_STRUCT_DATA_REF (vtable, scm_vtable_index_size) + 1
 547                       == n)
 548                   && !SCM_VTABLE_INSTANCE_FINALIZER (vtable)))
 549     {
 550       /* Verily, we are making a simple struct with the right number of
 551          initializers, and no finalizer. */
 552       ret = scm_words ((scm_t_bits)SCM_STRUCT_DATA (vtable) | scm_tc3_struct,
 553                        n + 1);
 554       SCM_SET_CELL_WORD_1 (ret, (scm_t_bits)SCM_CELL_OBJECT_LOC (ret, 2));
 555       memcpy (SCM_STRUCT_DATA (ret), inits, (n - 1) * sizeof (SCM));
 556     }
 557   else
 558     ret = scm_c_make_structv (vtable, 0, n - 1, (scm_t_bits *) inits);
 559
 560   DROPN (n);
 561   PUSH (ret);
 562
 563   NEXT;
 564 }
 565
 566 VM_DEFINE_FUNCTION (169, struct_ref, "struct-ref", 2)
 567 {
 568   ARGS2 (obj, pos);
 569
 570   if (SCM_LIKELY (SCM_STRUCTP (obj)
 571                   && SCM_STRUCT_VTABLE_FLAG_IS_SET (obj,
 572                                                     SCM_VTABLE_FLAG_SIMPLE)
 573                   && SCM_I_INUMP (pos)))
 574     {
 575       SCM vtable;
 576       scm_t_bits index, len;
 577
 578       /* True, an inum is a signed value, but cast to unsigned it will
 579          certainly be more than the length, so we will fall through if
 580          index is negative. */
 581       index = SCM_I_INUM (pos);
 582       vtable = SCM_STRUCT_VTABLE (obj);
 583       len = SCM_STRUCT_DATA_REF (vtable, scm_vtable_index_size);
 584
 585       if (SCM_LIKELY (index < len))
 586         {
 587           scm_t_bits *data = SCM_STRUCT_DATA (obj);
 588           RETURN (SCM_PACK (data[index]));
 589         }
 590     }
 591
 592   SYNC_REGISTER ();
 593   RETURN (scm_struct_ref (obj, pos));
 594 }
 595
 596 VM_DEFINE_FUNCTION (170, struct_set, "struct-set", 3)
 597 {
 598   ARGS3 (obj, pos, val);
 599
 600   if (SCM_LIKELY (SCM_STRUCTP (obj)
 601                   && SCM_STRUCT_VTABLE_FLAG_IS_SET (obj,
 602                                                     SCM_VTABLE_FLAG_SIMPLE)
 603                   && SCM_STRUCT_VTABLE_FLAG_IS_SET (obj,
 604                                                     SCM_VTABLE_FLAG_SIMPLE_RW)
 605                   && SCM_I_INUMP (pos)))
 606     {
 607       SCM vtable;
 608       scm_t_bits index, len;
 609
 610       /* See above regarding index being >= 0. */
 611       index = SCM_I_INUM (pos);
 612       vtable = SCM_STRUCT_VTABLE (obj);
 613       len = SCM_STRUCT_DATA_REF (vtable, scm_vtable_index_size);
 614       if (SCM_LIKELY (index < len))
 615         {
 616           scm_t_bits *data = SCM_STRUCT_DATA (obj);
 617           data[index] = SCM_UNPACK (val);
 618           RETURN (val);
 619         }
 620     }
 621
 622   SYNC_REGISTER ();
 623   RETURN (scm_struct_set_x (obj, pos, val));
 624 }
 625
 626 \f
 627 /*
 628  * GOOPS support
 629  */
 630 VM_DEFINE_FUNCTION (171, class_of, "class-of", 1)
 631 {
 632   ARGS1 (obj);
 633   if (SCM_INSTANCEP (obj))
 634     RETURN (SCM_CLASS_OF (obj));
 635   SYNC_REGISTER ();
 636   RETURN (scm_class_of (obj));
 637 }
 638
 639 /* FIXME: No checking whatsoever. */
 640 VM_DEFINE_FUNCTION (172, slot_ref, "slot-ref", 2)
 641 {
 642   size_t slot;
 643   ARGS2 (instance, idx);
 644   slot = SCM_I_INUM (idx);
 645   RETURN (SCM_PACK (SCM_STRUCT_DATA (instance) [slot]));
 646 }
 647
 648 /* FIXME: No checking whatsoever. */
 649 VM_DEFINE_INSTRUCTION (173, slot_set, "slot-set", 0, 3, 0)
 650 {
 651   SCM instance, idx, val;
 652   size_t slot;
 653   POP3 (val, idx, instance);
 654   slot = SCM_I_INUM (idx);
 655   SCM_STRUCT_DATA (instance) [slot] = SCM_UNPACK (val);
 656   NEXT;
 657 }
 658
 659 \f
 660 /*
 661  * Bytevectors
 662  */
 663 #define VM_VALIDATE_BYTEVECTOR(x, proc)         \
 664   VM_ASSERT (SCM_BYTEVECTOR_P (x), vm_error_not_a_bytevector (proc, x))
 665
 666 #define BV_REF_WITH_ENDIANNESS(stem, fn_stem)                           \
 667 {                                                                       \
 668   SCM endianness;                                                       \
 669   POP (endianness);                                                     \
 670   if (scm_is_eq (endianness, scm_i_native_endianness))                  \
 671     goto VM_LABEL (bv_##stem##_native_ref);                             \
 672   {                                                                     \
 673     ARGS2 (bv, idx);                                                    \
 674     SYNC_REGISTER ();                                                   \
 675     RETURN (scm_bytevector_##fn_stem##_ref (bv, idx, endianness));      \
 676   }                                                                     \
 677 }
 678
 679 /* Return true (non-zero) if PTR has suitable alignment for TYPE.  */
 680 #define ALIGNED_P(ptr, type)                    \
 681   ((scm_t_uintptr) (ptr) % alignof_type (type) == 0)
 682
 683 VM_DEFINE_FUNCTION (174, bv_u16_ref, "bv-u16-ref", 3)
 684 BV_REF_WITH_ENDIANNESS (u16, u16)
 685 VM_DEFINE_FUNCTION (175, bv_s16_ref, "bv-s16-ref", 3)
 686 BV_REF_WITH_ENDIANNESS (s16, s16)
 687 VM_DEFINE_FUNCTION (176, bv_u32_ref, "bv-u32-ref", 3)
 688 BV_REF_WITH_ENDIANNESS (u32, u32)
 689 VM_DEFINE_FUNCTION (177, bv_s32_ref, "bv-s32-ref", 3)
 690 BV_REF_WITH_ENDIANNESS (s32, s32)
 691 VM_DEFINE_FUNCTION (178, bv_u64_ref, "bv-u64-ref", 3)
 692 BV_REF_WITH_ENDIANNESS (u64, u64)
 693 VM_DEFINE_FUNCTION (179, bv_s64_ref, "bv-s64-ref", 3)
 694 BV_REF_WITH_ENDIANNESS (s64, s64)
 695 VM_DEFINE_FUNCTION (180, bv_f32_ref, "bv-f32-ref", 3)
 696 BV_REF_WITH_ENDIANNESS (f32, ieee_single)
 697 VM_DEFINE_FUNCTION (181, bv_f64_ref, "bv-f64-ref", 3)
 698 BV_REF_WITH_ENDIANNESS (f64, ieee_double)
 699
 700 #undef BV_REF_WITH_ENDIANNESS
 701
 702 #define BV_FIXABLE_INT_REF(stem, fn_stem, type, size)                   \
 703 {                                                                       \
 704   scm_t_signed_bits i;                                                  \
 705   const scm_t_ ## type *int_ptr;                                        \
 706   ARGS2 (bv, idx);                                                      \
 707                                                                         \
 708   VM_VALIDATE_BYTEVECTOR (bv, "bv-" #stem "-ref");                      \
 709   i = SCM_I_INUM (idx);                                                 \
 710   int_ptr = (scm_t_ ## type *) (SCM_BYTEVECTOR_CONTENTS (bv) + i);      \
 711                                                                         \
 712   if (SCM_LIKELY (SCM_I_INUMP (idx)                                     \
 713                   && (i >= 0)                                           \
 714                   && (i + size <= SCM_BYTEVECTOR_LENGTH (bv))           \
 715                   && (ALIGNED_P (int_ptr, scm_t_ ## type))))            \
 716     RETURN (SCM_I_MAKINUM (*int_ptr));                                  \
 717   else                                                                  \
 718     {                                                                   \
 719       SYNC_REGISTER ();                                                 \
 720       RETURN (scm_bytevector_ ## fn_stem ## _ref (bv, idx));            \
 721     }                                                                   \
 722 }
 723
 724 #define BV_INT_REF(stem, type, size)                                    \
 725 {                                                                       \
 726   scm_t_signed_bits i;                                                  \
 727   const scm_t_ ## type *int_ptr;                                        \
 728   ARGS2 (bv, idx);                                                      \
 729                                                                         \
 730   VM_VALIDATE_BYTEVECTOR (bv, "bv-" #stem "-ref");                      \
 731   i = SCM_I_INUM (idx);                                                 \
 732   int_ptr = (scm_t_ ## type *) (SCM_BYTEVECTOR_CONTENTS (bv) + i);      \
 733                                                                         \
 734   if (SCM_LIKELY (SCM_I_INUMP (idx)                                     \
 735                   && (i >= 0)                                           \
 736                   && (i + size <= SCM_BYTEVECTOR_LENGTH (bv))           \
 737                   && (ALIGNED_P (int_ptr, scm_t_ ## type))))            \
 738     {                                                                   \
 739       scm_t_ ## type x = *int_ptr;                                      \
 740       if (SCM_FIXABLE (x))                                              \
 741         RETURN (SCM_I_MAKINUM (x));                                     \
 742       else                                                              \
 743         {                                                               \
 744           SYNC_REGISTER ();                                             \
 745           RETURN (scm_from_ ## type (x));                               \
 746         }                                                               \
 747     }                                                                   \
 748   else                                                                  \
 749     {                                                                   \
 750       SYNC_REGISTER ();                                                 \
 751       RETURN (scm_bytevector_ ## stem ## _native_ref (bv, idx));        \
 752     }                                                                   \
 753 }
 754
 755 #define BV_FLOAT_REF(stem, fn_stem, type, size)                         \
 756 {                                                                       \
 757   scm_t_signed_bits i;                                                  \
 758   const type *float_ptr;                                                \
 759   ARGS2 (bv, idx);                                                      \
 760                                                                         \
 761   VM_VALIDATE_BYTEVECTOR (bv, "bv-" #stem "-ref");                      \
 762   i = SCM_I_INUM (idx);                                                 \
 763   float_ptr = (type *) (SCM_BYTEVECTOR_CONTENTS (bv) + i);              \
 764                                                                         \
 765   SYNC_REGISTER ();                                                     \
 766   if (SCM_LIKELY (SCM_I_INUMP (idx)                                     \
 767                   && (i >= 0)                                           \
 768                   && (i + size <= SCM_BYTEVECTOR_LENGTH (bv))           \
 769                   && (ALIGNED_P (float_ptr, type))))                    \
 770     RETURN (scm_from_double (*float_ptr));                              \
 771   else                                                                  \
 772     RETURN (scm_bytevector_ ## fn_stem ## _native_ref (bv, idx));       \
 773 }
 774
 775 VM_DEFINE_FUNCTION (182, bv_u8_ref, "bv-u8-ref", 2)
 776 BV_FIXABLE_INT_REF (u8, u8, uint8, 1)
 777 VM_DEFINE_FUNCTION (183, bv_s8_ref, "bv-s8-ref", 2)
 778 BV_FIXABLE_INT_REF (s8, s8, int8, 1)
 779 VM_DEFINE_FUNCTION (184, bv_u16_native_ref, "bv-u16-native-ref", 2)
 780 BV_FIXABLE_INT_REF (u16, u16_native, uint16, 2)
 781 VM_DEFINE_FUNCTION (185, bv_s16_native_ref, "bv-s16-native-ref", 2)
 782 BV_FIXABLE_INT_REF (s16, s16_native, int16, 2)
 783 VM_DEFINE_FUNCTION (186, bv_u32_native_ref, "bv-u32-native-ref", 2)
 784 #if SIZEOF_VOID_P > 4
 785 BV_FIXABLE_INT_REF (u32, u32_native, uint32, 4)
 786 #else
 787 BV_INT_REF (u32, uint32, 4)
 788 #endif
 789 VM_DEFINE_FUNCTION (187, bv_s32_native_ref, "bv-s32-native-ref", 2)
 790 #if SIZEOF_VOID_P > 4
 791 BV_FIXABLE_INT_REF (s32, s32_native, int32, 4)
 792 #else
 793 BV_INT_REF (s32, int32, 4)
 794 #endif
 795 VM_DEFINE_FUNCTION (188, bv_u64_native_ref, "bv-u64-native-ref", 2)
 796 BV_INT_REF (u64, uint64, 8)
 797 VM_DEFINE_FUNCTION (189, bv_s64_native_ref, "bv-s64-native-ref", 2)
 798 BV_INT_REF (s64, int64, 8)
 799 VM_DEFINE_FUNCTION (190, bv_f32_native_ref, "bv-f32-native-ref", 2)
 800 BV_FLOAT_REF (f32, ieee_single, float, 4)
 801 VM_DEFINE_FUNCTION (191, bv_f64_native_ref, "bv-f64-native-ref", 2)
 802 BV_FLOAT_REF (f64, ieee_double, double, 8)
 803
 804 #undef BV_FIXABLE_INT_REF
 805 #undef BV_INT_REF
 806 #undef BV_FLOAT_REF
 807
 808
 809
 810 #define BV_SET_WITH_ENDIANNESS(stem, fn_stem)                           \
 811 {                                                                       \
 812   SCM endianness;                                                       \
 813   POP (endianness);                                                     \
 814   if (scm_is_eq (endianness, scm_i_native_endianness))                  \
 815     goto VM_LABEL (bv_##stem##_native_set);                             \
 816   {                                                                     \
 817     SCM bv, idx, val; POP3 (val, idx, bv);                              \
 818     SYNC_REGISTER ();                                                   \
 819     scm_bytevector_##fn_stem##_set_x (bv, idx, val, endianness);        \
 820     NEXT;                                                               \
 821   }                                                                     \
 822 }
 823
 824 VM_DEFINE_INSTRUCTION (192, bv_u16_set, "bv-u16-set", 0, 4, 0)
 825 BV_SET_WITH_ENDIANNESS (u16, u16)
 826 VM_DEFINE_INSTRUCTION (193, bv_s16_set, "bv-s16-set", 0, 4, 0)
 827 BV_SET_WITH_ENDIANNESS (s16, s16)
 828 VM_DEFINE_INSTRUCTION (194, bv_u32_set, "bv-u32-set", 0, 4, 0)
 829 BV_SET_WITH_ENDIANNESS (u32, u32)
 830 VM_DEFINE_INSTRUCTION (195, bv_s32_set, "bv-s32-set", 0, 4, 0)
 831 BV_SET_WITH_ENDIANNESS (s32, s32)
 832 VM_DEFINE_INSTRUCTION (196, bv_u64_set, "bv-u64-set", 0, 4, 0)
 833 BV_SET_WITH_ENDIANNESS (u64, u64)
 834 VM_DEFINE_INSTRUCTION (197, bv_s64_set, "bv-s64-set", 0, 4, 0)
 835 BV_SET_WITH_ENDIANNESS (s64, s64)
 836 VM_DEFINE_INSTRUCTION (198, bv_f32_set, "bv-f32-set", 0, 4, 0)
 837 BV_SET_WITH_ENDIANNESS (f32, ieee_single)
 838 VM_DEFINE_INSTRUCTION (199, bv_f64_set, "bv-f64-set", 0, 4, 0)
 839 BV_SET_WITH_ENDIANNESS (f64, ieee_double)
 840
 841 #undef BV_SET_WITH_ENDIANNESS
 842
 843 #define BV_FIXABLE_INT_SET(stem, fn_stem, type, min, max, size)         \
 844 {                                                                       \
 845   scm_t_signed_bits i, j = 0;                                           \
 846   SCM bv, idx, val;                                                     \
 847   scm_t_ ## type *int_ptr;                                              \
 848                                                                         \
 849   POP3 (val, idx, bv);                                                  \
 850   VM_VALIDATE_BYTEVECTOR (bv, "bv-" #stem "-set");                      \
 851   i = SCM_I_INUM (idx);                                                 \
 852   int_ptr = (scm_t_ ## type *) (SCM_BYTEVECTOR_CONTENTS (bv) + i);      \
 853                                                                         \
 854   if (SCM_LIKELY (SCM_I_INUMP (idx)                                     \
 855                   && (i >= 0)                                           \
 856                   && (i + size <= SCM_BYTEVECTOR_LENGTH (bv))           \
 857                   && (ALIGNED_P (int_ptr, scm_t_ ## type))              \
 858                   && (SCM_I_INUMP (val))                                \
 859                   && ((j = SCM_I_INUM (val)) >= min)                    \
 860                   && (j <= max)))                                       \
 861     *int_ptr = (scm_t_ ## type) j;                                      \
 862   else                                                                  \
 863     {                                                                   \
 864       SYNC_REGISTER ();                                                 \
 865       scm_bytevector_ ## fn_stem ## _set_x (bv, idx, val);              \
 866     }                                                                   \
 867   NEXT;                                                                 \
 868 }
 869
 870 #define BV_INT_SET(stem, type, size)                                    \
 871 {                                                                       \
 872   scm_t_signed_bits i = 0;                                              \
 873   SCM bv, idx, val;                                                     \
 874   scm_t_ ## type *int_ptr;                                              \
 875                                                                         \
 876   POP3 (val, idx, bv);                                                  \
 877   VM_VALIDATE_BYTEVECTOR (bv, "bv-" #stem "-set");                      \
 878   i = SCM_I_INUM (idx);                                                 \
 879   int_ptr = (scm_t_ ## type *) (SCM_BYTEVECTOR_CONTENTS (bv) + i);      \
 880                                                                         \
 881   if (SCM_LIKELY (SCM_I_INUMP (idx)                                     \
 882                   && (i >= 0)                                           \
 883                   && (i + size <= SCM_BYTEVECTOR_LENGTH (bv))           \
 884                   && (ALIGNED_P (int_ptr, scm_t_ ## type))))            \
 885     *int_ptr = scm_to_ ## type (val);                                   \
 886   else                                                                  \
 887     {                                                                   \
 888       SYNC_REGISTER ();                                                 \
 889       scm_bytevector_ ## stem ## _native_set_x (bv, idx, val);          \
 890     }                                                                   \
 891   NEXT;                                                                 \
 892 }
 893
 894 #define BV_FLOAT_SET(stem, fn_stem, type, size)                         \
 895 {                                                                       \
 896   scm_t_signed_bits i = 0;                                              \
 897   SCM bv, idx, val;                                                     \
 898   type *float_ptr;                                                      \
 899                                                                         \
 900   POP3 (val, idx, bv);                                                  \
 901   VM_VALIDATE_BYTEVECTOR (bv, "bv-" #stem "-set");                      \
 902   i = SCM_I_INUM (idx);                                                 \
 903   float_ptr = (type *) (SCM_BYTEVECTOR_CONTENTS (bv) + i);              \
 904                                                                         \
 905   if (SCM_LIKELY (SCM_I_INUMP (idx)                                     \
 906                   && (i >= 0)                                           \
 907                   && (i + size <= SCM_BYTEVECTOR_LENGTH (bv))           \
 908                   && (ALIGNED_P (float_ptr, type))))                    \
 909     *float_ptr = scm_to_double (val);                                   \
 910   else                                                                  \
 911     {                                                                   \
 912       SYNC_REGISTER ();                                                 \
 913       scm_bytevector_ ## fn_stem ## _native_set_x (bv, idx, val);       \
 914     }                                                                   \
 915   NEXT;                                                                 \
 916 }
 917
 918 VM_DEFINE_INSTRUCTION (200, bv_u8_set, "bv-u8-set", 0, 3, 0)
 919 BV_FIXABLE_INT_SET (u8, u8, uint8, 0, SCM_T_UINT8_MAX, 1)
 920 VM_DEFINE_INSTRUCTION (201, bv_s8_set, "bv-s8-set", 0, 3, 0)
 921 BV_FIXABLE_INT_SET (s8, s8, int8, SCM_T_INT8_MIN, SCM_T_INT8_MAX, 1)
 922 VM_DEFINE_INSTRUCTION (202, bv_u16_native_set, "bv-u16-native-set", 0, 3, 0)
 923 BV_FIXABLE_INT_SET (u16, u16_native, uint16, 0, SCM_T_UINT16_MAX, 2)
 924 VM_DEFINE_INSTRUCTION (203, bv_s16_native_set, "bv-s16-native-set", 0, 3, 0)
 925 BV_FIXABLE_INT_SET (s16, s16_native, int16, SCM_T_INT16_MIN, SCM_T_INT16_MAX, 2)
 926 VM_DEFINE_INSTRUCTION (204, bv_u32_native_set, "bv-u32-native-set", 0, 3, 0)
 927 #if SIZEOF_VOID_P > 4
 928 BV_FIXABLE_INT_SET (u32, u32_native, uint32, 0, SCM_T_UINT32_MAX, 4)
 929 #else
 930 BV_INT_SET (u32, uint32, 4)
 931 #endif
 932 VM_DEFINE_INSTRUCTION (205, bv_s32_native_set, "bv-s32-native-set", 0, 3, 0)
 933 #if SIZEOF_VOID_P > 4
 934 BV_FIXABLE_INT_SET (s32, s32_native, int32, SCM_T_INT32_MIN, SCM_T_INT32_MAX, 4)
 935 #else
 936 BV_INT_SET (s32, int32, 4)
 937 #endif
 938 VM_DEFINE_INSTRUCTION (206, bv_u64_native_set, "bv-u64-native-set", 0, 3, 0)
 939 BV_INT_SET (u64, uint64, 8)
 940 VM_DEFINE_INSTRUCTION (207, bv_s64_native_set, "bv-s64-native-set", 0, 3, 0)
 941 BV_INT_SET (s64, int64, 8)
 942 VM_DEFINE_INSTRUCTION (208, bv_f32_native_set, "bv-f32-native-set", 0, 3, 0)
 943 BV_FLOAT_SET (f32, ieee_single, float, 4)
 944 VM_DEFINE_INSTRUCTION (209, bv_f64_native_set, "bv-f64-native-set", 0, 3, 0)
 945 BV_FLOAT_SET (f64, ieee_double, double, 8)
 946
 947 #undef BV_FIXABLE_INT_SET
 948 #undef BV_INT_SET
 949 #undef BV_FLOAT_SET
 950
 951 /*
 952 (defun renumber-ops ()
 953   "start from top of buffer and renumber 'VM_DEFINE_FOO (\n' sequences"
 954   (interactive "")
 955   (save-excursion
 956     (let ((counter 127)) (goto-char (point-min))
 957       (while (re-search-forward "^VM_DEFINE_[^ ]+ (\\([^,]+\\)," (point-max) t)
 958         (replace-match
 959          (number-to-string (setq counter (1+ counter)))
 960           t t nil 1)))))
 961 */
 962
 963 /*
 964   Local Variables:
 965   c-file-style: "gnu"
 966   End:
 967 */