libguile/tags.h

   1 /* classes: h_files */
   2
   3 #ifndef SCM_TAGS_H
   4 #define SCM_TAGS_H
   5 /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001 Free Software Foundation, Inc.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2, or (at your option)
  10  * any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this software; see the file COPYING.  If not, write to
  19  * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  20  * Boston, MA 02111-1307 USA
  21  *
  22  * As a special exception, the Free Software Foundation gives permission
  23  * for additional uses of the text contained in its release of GUILE.
  24  *
  25  * The exception is that, if you link the GUILE library with other files
  26  * to produce an executable, this does not by itself cause the
  27  * resulting executable to be covered by the GNU General Public License.
  28  * Your use of that executable is in no way restricted on account of
  29  * linking the GUILE library code into it.
  30  *
  31  * This exception does not however invalidate any other reasons why
  32  * the executable file might be covered by the GNU General Public License.
  33  *
  34  * This exception applies only to the code released by the
  35  * Free Software Foundation under the name GUILE.  If you copy
  36  * code from other Free Software Foundation releases into a copy of
  37  * GUILE, as the General Public License permits, the exception does
  38  * not apply to the code that you add in this way.  To avoid misleading
  39  * anyone as to the status of such modified files, you must delete
  40  * this exception notice from them.
  41  *
  42  * If you write modifications of your own for GUILE, it is your choice
  43  * whether to permit this exception to apply to your modifications.
  44  * If you do not wish that, delete this exception notice.  */
  45
  46
  47 \f
  48
  49 /** This file defines the format of SCM values and cons pairs.
  50  ** It is here that tag bits are assigned for various purposes.
  51  **/
  52
  53 #ifdef HAVE_STDINT_H
  54 #include <stdint.h>
  55 #endif
  56
  57 #ifdef HAVE_INTTYPES_H
  58 #include <inttypes.h>
  59 #endif
  60
  61 \f
  62
  63 /* In the beginning was the Word:
  64  */
  65 #ifdef HAVE_UINTPTR_T
  66 typedef uintptr_t scm_t_bits;
  67 typedef intptr_t scm_t_signed_bits;
  68 #else
  69 typedef unsigned long scm_t_bits;
  70 typedef signed long scm_t_signed_bits;
  71 #endif
  72
  73 /* But as external interface, we use SCM, which may, according to the desired
  74  * level of type checking, be defined in several ways:
  75  */
  76 #if (SCM_DEBUG_TYPING_STRICTNESS == 2)
  77     typedef union { struct { scm_t_bits n; } n; } SCM;
  78     static SCM scm_pack(scm_t_bits b) { SCM s; s.n.n = b; return s; }
  79 #   define SCM_UNPACK(x) ((x).n.n)
  80 #   define SCM_PACK(x) (scm_pack ((scm_t_bits) (x)))
  81 #elif (SCM_DEBUG_TYPING_STRICTNESS == 1)
  82 /* This is the default, which provides an intermediate level of compile time
  83  * type checking while still resulting in very efficient code.
  84  */
  85     typedef struct scm_unused_struct * SCM;
  86 #   define SCM_UNPACK(x) ((scm_t_bits) (x))
  87 #   define SCM_PACK(x) ((SCM) (x))
  88 #else
  89 /* This should be used as a fall back solution for machines on which casting
  90  * to a pointer may lead to loss of bit information, e. g. in the three least
  91  * significant bits.
  92  */
  93     typedef scm_t_bits SCM;
  94 #   define SCM_UNPACK(x) (x)
  95 #   define SCM_PACK(x) ((scm_t_bits) (x))
  96 #endif
  97
  98
  99 /* SCM values can not be compared by using the operator ==.  Use the following
 100  * macro instead, which is the equivalent of the scheme predicate 'eq?'.
 101  */
 102 #define SCM_EQ_P(x, y) (SCM_UNPACK (x) == SCM_UNPACK (y))
 103
 104 \f
 105
 106 /* SCM variables can contain:
 107  *
 108  * Non-objects -- meaning that the tag-related macros don't apply to them
 109  * in the usual way.
 110  *
 111  * Immediates -- meaning that the variable contains an entire Scheme object.
 112  *
 113  * Non-immediates -- meaning that the variable holds a (possibly
 114  * tagged) pointer into the cons pair heap.
 115  *
 116  * Non-objects are distinguished from other values by careful coding
 117  * only (i.e., programmers must keep track of any SCM variables they
 118  * create that don't contain ordinary scheme values).
 119  *
 120  * All immediates and non-immediates must have a 0 in bit 0.  Only
 121  * non-object values can have a 1 in bit 0.  In some cases, bit 0 of a
 122  * word in the heap is used for the GC tag so during garbage
 123  * collection, that bit might be 1 even in an immediate or
 124  * non-immediate value.  In other cases, bit 0 of a word in the heap
 125  * is used to tag a pointer to a GLOC (VM global variable address) or
 126  * the header of a struct.  But whenever an SCM variable holds a
 127  * normal Scheme value, bit 0 is 0.
 128  *
 129  * Immediates and non-immediates are distinguished by bits two and four.
 130  * Immediate values must have a 1 in at least one of those bits.  Does
 131  * this (or any other detail of tagging) seem arbitrary?  Try changing it!
 132  * (Not always impossible but it is fair to say that many details of tags
 133  * are mutually dependent).  */
 134
 135 #define SCM_IMP(x)              (6 & SCM_UNPACK (x))
 136 #define SCM_NIMP(x)             (!SCM_IMP (x))
 137
 138 /* Here is a summary of tagging in SCM values as they might occur in
 139  * SCM variables or in the heap.
 140  *
 141  * low bits    meaning
 142  *
 143  *
 144  * 0            Most objects except...
 145  * 1            ...glocs and structs (this tag valid only in a SCM_CAR or
 146  *              in the header of a struct's data).
 147  *
 148  * 00           heap addresses and many immediates (not integers)
 149  * 01           glocs/structs, some tc7_ codes
 150  * 10           immediate integers
 151  * 11           various tc7_ codes including, tc16_ codes.
 152  *
 153  *
 154  * 000          heap address
 155  * 001          glocs/structs
 156  * 010          integer
 157  * 011          closure
 158  * 100          immediates
 159  * 101          tc7_
 160  * 110          integer
 161  * 111          tc7_
 162  *
 163  *
 164  * 100 --- IMMEDIATES
 165  *
 166  * Looking at the seven final bits of an immediate:
 167  *
 168  * 0000-100     short instruction
 169  * 0001-100     short instruction
 170  * 0010-100     short instruction
 171  * 0011-100     short instruction
 172  * 0100-100     short instruction
 173  * 0101-100     short instruction
 174  * 0110-100     various immediates and long instructions
 175  * 0111-100     short instruction
 176  * 1000-100     short instruction
 177  * 1001-100     short instruction
 178  * 1010-100     short instruction
 179  * 1011-100     short instruction
 180  * 1100-100     short instruction
 181  * 1101-100     short instruction
 182  * 1110-100     immediate characters
 183  * 1111-100     ilocs
 184  *
 185  * Some of the 0110100 immediates are long instructions (they dispatch
 186  * in two steps compared to one step for a short instruction).
 187  * The two steps are, (1) dispatch on 7 bits to the long instruction
 188  * handler, (2) dispatch on 7 additional bits.
 189  *
 190  * One way to think of it is that there are 128 short instructions,
 191  * with the 13 immediates above being some of the most interesting.
 192  *
 193  * Also noteworthy are the groups of 16 7-bit instructions implied by
 194  * some of the 3-bit tags.   For example, closure references consist
 195  * of an 8-bit aligned address tagged with 011.  There are 16 identical 7-bit
 196  * instructions, all ending 011, which are invoked by evaluating closures.
 197  *
 198  * In other words, if you hand the evaluator a closure, the evaluator
 199  * treats the closure as a graph of virtual machine instructions.
 200  * A closure is a pair with a pointer to the body of the procedure
 201  * in the CDR and a pointer to the environment of the closure in the CAR.
 202  * The environment pointer is tagged 011 which implies that the least
 203  * significant 7 bits of the environment pointer also happen to be
 204  * a virtual machine instruction we could call "SELF" (for self-evaluating
 205  * object).
 206  *
 207  * A less trivial example are the 16 instructions ending 000.  If those
 208  * bits tag the CAR of a pair, then evidently the pair is an ordinary
 209  * cons pair and should be evaluated as a procedure application.  The sixteen,
 210  * 7-bit 000 instructions are all "NORMAL-APPLY"  (Things get trickier.
 211  * For example, if the CAR of a procedure application is a symbol, the NORMAL-APPLY
 212  * instruction will, as a side effect, overwrite that CAR with a new instruction
 213  * that contains a cached address for the variable named by the symbol.)
 214  *
 215  * Here is a summary of tags in the CAR of a non-immediate:
 216  *
 217  *   HEAP CELL: G=gc_mark; 1 during mark, 0 other times.
 218  *
 219  * cons    ..........SCM car..............0  ...........SCM cdr.............G
 220  * gloc    ..........SCM vcell..........001  ...........SCM cdr.............G
 221  * struct  ..........void * type........001  ...........void * data.........G
 222  * closure ..........SCM code...........011  ...........SCM env.............G
 223  * tc7     ......24.bits of data...Gxxxx1S1  ..........void *data............
 224  *
 225  *
 226  *
 227  * 101 & 111 --- tc7_ types
 228  *
 229  *              tc7_tags are 7 bit tags ending in 1x1.  These tags
 230  *              occur only in the CAR of heap cells, and have the
 231  *              handy property that all bits of the CAR above the
 232  *              bottom eight can be used to store some data, thus
 233  *              saving a word in the body itself.  Thus, we use them
 234  *              for strings and vectors (among other things).
 235  *
 236  *              TYP7(X) returns bits 0...6 of CELL_TYPE (X)
 237  *
 238  *              Sometimes we choose the bottom seven bits carefully,
 239  *              so that the 2-valued bit (called S bit) can be masked
 240  *              off to reveal a common type.
 241  *
 242  *              TYP7S(X) returns TYP7, but masking out the option bit S.
 243  *
 244  *              For example, all strings have 0010 in the 'xxxx' bits
 245  *              in the diagram above, the S bit says whether it's a
 246  *              substring.
 247  *
 248  *              for example:
 249  *                                                      S
 250  *                      scm_tc7_string          = G0010101
 251  *                      scm_tc7_substring       = G0010111
 252  *
 253  *              TYP7S turns both string tags into tc7_string; thus,
 254  *              testing TYP7S against tc7_string is a quick way to
 255  *              test for any kind of string, shared or unshared.
 256  *
 257  *              Some TC7 types are subdivided into 256 subtypes giving
 258  *              rise to the macros:
 259  *
 260  *              TYP16
 261  *              TYP16S
 262  *
 263  *              TYP16S functions similarly wrt to TYP16 as TYP7S to TYP7,
 264  *              but a different option bit is used (bit 2 for TYP7S,
 265  *              bit 8 for TYP16S).
 266  * */
 267
 268
 269
 270 \f
 271 /* {Non-immediate values.}
 272  *
 273  * If X is non-immediate, it is necessary to look at SCM_CAR (X) to
 274  * figure out Xs type.  X may be a cons pair, in which case the value
 275  * SCM_CAR (x) will be either an immediate or non-immediate value.  X
 276  * may be something other than a cons pair, in which case the value
 277  * SCM_CAR (x) will be a non-object value.
 278  *
 279  * All immediates and non-immediates have a 0 in bit 0.  We
 280  * additionally preserve the invariant that all non-object values
 281  * stored in the SCM_CAR of a non-immediate object have a 1 in bit 1:
 282  */
 283
 284 #define SCM_CONSP(x)  (!SCM_IMP (x) && ((1 & SCM_CELL_TYPE (x)) == 0))
 285 #define SCM_NCONSP(x) (!SCM_CONSP (x))
 286
 287
 288 /* SCM_ECONSP should be used instead of SCM_CONSP at places where GLOCS
 289  * can be expected to occur.
 290  */
 291 #define SCM_ECONSP(x) \
 292   (!SCM_IMP (x) \
 293    && (SCM_CONSP (x) \
 294        || (SCM_TYP3 (x) == 1 \
 295            && (SCM_STRUCT_VTABLE_DATA (x)[scm_vtable_index_vcell] != 0))))
 296 #define SCM_NECONSP(x) (!SCM_ECONSP (x))
 297
 298 \f
 299
 300 #define SCM_CELLP(x)    (((sizeof (scm_cell) - 1) & SCM_UNPACK (x)) == 0)
 301 #define SCM_NCELLP(x)   (!SCM_CELLP (x))
 302
 303 /* See numbers.h for macros relating to immediate integers.
 304  */
 305
 306 #define SCM_ITAG3(x)            (7 & SCM_UNPACK (x))
 307 #define SCM_TYP3(x)             (7 & SCM_CELL_TYPE (x))
 308 #define scm_tc3_cons            0
 309 #define scm_tc3_cons_gloc       1
 310 #define scm_tc3_int_1           2
 311 #define scm_tc3_closure          3
 312 #define scm_tc3_imm24            4
 313 #define scm_tc3_tc7_1            5
 314 #define scm_tc3_int_2            6
 315 #define scm_tc3_tc7_2            7
 316
 317
 318 /*
 319  * Do not change the three bit tags.
 320  */
 321
 322
 323 #define SCM_ITAG7(x)            (127 & SCM_UNPACK (x))
 324 #define SCM_TYP7(x)             (0x7f &        SCM_CELL_TYPE (x))
 325 #define SCM_TYP7S(x)            ((0x7f & ~2) & SCM_CELL_TYPE (x))
 326
 327
 328 #define SCM_TYP16(x)            (0xffff & SCM_CELL_TYPE (x))
 329 #define SCM_TYP16S(x)           (0xfeff & SCM_CELL_TYPE (x))
 330
 331 #define SCM_TYP16_PREDICATE(tag,x) (SCM_NIMP (x) && SCM_TYP16 (x) == (tag))
 332
 333 \f
 334
 335 #define scm_tc7_symbol          5
 336 #define scm_tc7_variable        7
 337
 338 /* couple */
 339 #define scm_tc7_vector          13
 340 #define scm_tc7_wvect           15
 341
 342 /* couple */
 343 #define scm_tc7_string          21
 344 #define scm_tc7_substring       23
 345
 346 /* Many of the following should be turned
 347  * into structs or smobs.  We need back some
 348  * of these 7 bit tags!
 349  */
 350 #define scm_tc7_pws             31
 351
 352 #ifdef HAVE_ARRAYS
 353 #define scm_tc7_llvect          29
 354 #define scm_tc7_uvect           37
 355 /* free                         39 */
 356 #define scm_tc7_fvect           45
 357 #define scm_tc7_dvect           47
 358 #define scm_tc7_cvect           53
 359 #define scm_tc7_svect           55
 360 #define scm_tc7_bvect           71
 361 #define scm_tc7_byvect          77
 362 #define scm_tc7_ivect           79
 363 #endif
 364
 365 /* free                         61 */
 366 #define scm_tc7_cclo            63
 367 #define scm_tc7_rpsubr          69
 368 #define scm_tc7_subr_0          85
 369 #define scm_tc7_subr_1          87
 370 #define scm_tc7_cxr             93
 371 #define scm_tc7_subr_3          95
 372 #define scm_tc7_subr_2          101
 373 #define scm_tc7_asubr           103
 374 #define scm_tc7_subr_1o         109
 375 #define scm_tc7_subr_2o         111
 376 #define scm_tc7_lsubr_2         117
 377 #define scm_tc7_lsubr           119
 378
 379
 380 /* There are 256 port subtypes.
 381  */
 382 #define scm_tc7_port            125
 383
 384
 385 /* There are 256 smob subtypes.  Here are the first four.
 386  */
 387
 388 #define scm_tc7_smob            127 /* DO NOT CHANGE [**] */
 389
 390 /* [**] If you change scm_tc7_smob, you must also change
 391  * the places it is hard coded in this file and possibly others.
 392  */
 393
 394
 395 /* scm_tc_free_cell is also the 0th smob type.  We place this
 396  * in free cells to tell the conservative marker not to trace it.
 397  */
 398 #define scm_tc_free_cell        (scm_tc7_smob + 0 * 256L)
 399
 400 /* Smob type 1 to 3 (note the dependency on the predicate SCM_NUMP)
 401  */
 402 #define scm_tc16_big            (scm_tc7_smob + 1 * 256L)
 403 #define scm_tc16_real           (scm_tc7_smob + 2 * 256L)
 404 #define scm_tc16_complex        (scm_tc7_smob + 3 * 256L)
 405
 406 \f
 407 /* {Immediate Values}
 408  */
 409
 410 enum scm_tags
 411 {
 412   scm_tc8_char = 0xf4,
 413   scm_tc8_iloc = 0xfc
 414 };
 415
 416 #define SCM_ITAG8(X)            (SCM_UNPACK (X) & 0xff)
 417 #define SCM_MAKE_ITAG8(X, TAG)  SCM_PACK (((X) << 8) + TAG)
 418 #define SCM_ITAG8_DATA(X)       (SCM_UNPACK (X) >> 8)
 419
 420
 421 \f
 422 /* Immediate Symbols, Special Symbols, Flags (various constants).
 423  */
 424
 425 /* SCM_ISYMP tests for ISPCSYM and ISYM */
 426 #define SCM_ISYMP(n)            ((0x187 & SCM_UNPACK (n)) == 4)
 427
 428 /* SCM_IFLAGP tests for ISPCSYM, ISYM and IFLAG */
 429 #define SCM_IFLAGP(n)           ((0x87 & SCM_UNPACK (n)) == 4)
 430 #define SCM_ISYMNUM(n)          (SCM_UNPACK (n) >> 9)
 431 #define SCM_ISYMCHARS(n)        (scm_isymnames[SCM_ISYMNUM (n)])
 432 #define SCM_MAKSPCSYM(n)        SCM_PACK (((n) << 9) + ((n) << 3) + 4L)
 433 #define SCM_MAKISYM(n)          SCM_PACK (((n) << 9) + 0x74L)
 434 #define SCM_MAKIFLAG(n)         SCM_PACK (((n) << 9) + 0x174L)
 435
 436 extern char *scm_isymnames[];   /* defined in print.c */
 437
 438 /* This table must agree with the declarations
 439  * in repl.c: {Names of immediate symbols}.
 440  *
 441  * These are used only in eval but their values
 442  * have to be allocated here.
 443  *
 444  */
 445
 446 #define SCM_IM_AND              SCM_MAKSPCSYM (0)
 447 #define SCM_IM_BEGIN            SCM_MAKSPCSYM (1)
 448 #define SCM_IM_CASE             SCM_MAKSPCSYM (2)
 449 #define SCM_IM_COND             SCM_MAKSPCSYM (3)
 450 #define SCM_IM_DO               SCM_MAKSPCSYM (4)
 451 #define SCM_IM_IF               SCM_MAKSPCSYM (5)
 452 #define SCM_IM_LAMBDA           SCM_MAKSPCSYM (6)
 453 #define SCM_IM_LET              SCM_MAKSPCSYM (7)
 454 #define SCM_IM_LETSTAR          SCM_MAKSPCSYM (8)
 455 #define SCM_IM_LETREC           SCM_MAKSPCSYM (9)
 456 #define SCM_IM_OR               SCM_MAKSPCSYM (10)
 457 #define SCM_IM_QUOTE            SCM_MAKSPCSYM (11)
 458 #define SCM_IM_SET_X            SCM_MAKSPCSYM (12)
 459 #define SCM_IM_DEFINE           SCM_MAKSPCSYM (13)
 460 #define SCM_IM_APPLY            SCM_MAKISYM (14)
 461 #define SCM_IM_CONT             SCM_MAKISYM (15)
 462 #define SCM_BOOL_F              SCM_MAKIFLAG (16)
 463 #define SCM_BOOL_T              SCM_MAKIFLAG (17)
 464 #define SCM_UNDEFINED           SCM_MAKIFLAG (18)
 465 #define SCM_EOF_VAL             SCM_MAKIFLAG (19)
 466 #define SCM_EOL                 SCM_MAKIFLAG (20)
 467 #define SCM_UNSPECIFIED         SCM_MAKIFLAG (21)
 468 #define SCM_IM_DISPATCH         SCM_MAKISYM (22)
 469 #define SCM_IM_SLOT_REF         SCM_MAKISYM (23)
 470 #define SCM_IM_SLOT_SET_X       SCM_MAKISYM (24)
 471
 472 /* Multi-language support */
 473
 474 #define SCM_IM_NIL_COND         SCM_MAKISYM (25)
 475 #define SCM_IM_NIL_IFY          SCM_MAKISYM (26)
 476 #define SCM_IM_T_IFY            SCM_MAKISYM (27)
 477 #define SCM_IM_0_COND           SCM_MAKISYM (28)
 478 #define SCM_IM_0_IFY            SCM_MAKISYM (29)
 479 #define SCM_IM_1_IFY            SCM_MAKISYM (30)
 480 #define SCM_IM_BIND             SCM_MAKISYM (31)
 481
 482 #define SCM_IM_DELAY            SCM_MAKISYM (32)
 483 #define SCM_IM_CALL_WITH_VALUES SCM_MAKISYM (33)
 484
 485 /* When a variable is unbound this is marked by the SCM_UNDEFINED
 486  * value.  The following is an unbound value which can be handled on
 487  * the Scheme level, i.e., it can be stored in and retrieved from a
 488  * Scheme variable.  This value is only intended to mark an unbound
 489  * slot in GOOPS.  It is needed now, but we should probably rewrite
 490  * the code which handles this value in C so that SCM_UNDEFINED can be
 491  * used instead.  It is not ideal to let this kind of unique and
 492  * strange values loose on the Scheme level.
 493  */
 494 #define SCM_UNBOUND             SCM_MAKIFLAG (34)
 495
 496 #define SCM_UNBNDP(x)           (SCM_EQ_P ((x), SCM_UNDEFINED))
 497
 498 \f
 499
 500 /* Dispatching aids: */
 501
 502
 503 /* For cons pairs with immediate values in the CAR
 504  */
 505
 506 #define scm_tcs_cons_imcar 2:case 4:case 6:case 10:\
 507  case 12:case 14:case 18:case 20:\
 508  case 22:case 26:case 28:case 30:\
 509  case 34:case 36:case 38:case 42:\
 510  case 44:case 46:case 50:case 52:\
 511  case 54:case 58:case 60:case 62:\
 512  case 66:case 68:case 70:case 74:\
 513  case 76:case 78:case 82:case 84:\
 514  case 86:case 90:case 92:case 94:\
 515  case 98:case 100:case 102:case 106:\
 516  case 108:case 110:case 114:case 116:\
 517  case 118:case 122:case 124:case 126
 518
 519 /* For cons pairs with non-immediate values in the SCM_CAR
 520  */
 521 #define scm_tcs_cons_nimcar 0:case 8:case 16:case 24:\
 522  case 32:case 40:case 48:case 56:\
 523  case 64:case 72:case 80:case 88:\
 524  case 96:case 104:case 112:case 120
 525
 526 /* A CONS_GLOC occurs in code.  It's CAR is a pointer to the
 527  * CDR of a variable.  The low order bits of the CAR are 001.
 528  * The CDR of the gloc is the code continuation.
 529  */
 530 #define scm_tcs_cons_gloc 1:case 9:case 17:case 25:\
 531  case 33:case 41:case 49:case 57:\
 532  case 65:case 73:case 81:case 89:\
 533  case 97:case 105:case 113:case 121
 534
 535 #define scm_tcs_closures   3:case 11:case 19:case 27:\
 536  case 35:case 43:case 51:case 59:\
 537  case 67:case 75:case 83:case 91:\
 538  case 99:case 107:case 115:case 123
 539
 540 #define scm_tcs_subrs scm_tc7_asubr:case scm_tc7_subr_0:case scm_tc7_subr_1:case scm_tc7_cxr:\
 541  case scm_tc7_subr_3:case scm_tc7_subr_2:case scm_tc7_rpsubr:case scm_tc7_subr_1o:\
 542  case scm_tc7_subr_2o:case scm_tc7_lsubr_2:case scm_tc7_lsubr
 543
 544 \f
 545
 546 #if (SCM_DEBUG_DEPRECATED == 0)
 547
 548 #define SCM_SLOPPY_CONSP(x)  ((1 & SCM_CELL_TYPE (x)) == 0)
 549 #define SCM_SLOPPY_NCONSP(x) (!SCM_SLOPPY_CONSP(x))
 550
 551 #define scm_tc7_ssymbol         scm_tc7_symbol
 552 #define scm_tc7_msymbol         scm_tc7_symbol
 553 #define scm_tcs_symbols         scm_tc7_symbol
 554
 555 #endif  /* SCM_DEBUG_DEPRECATED == 0 */
 556
 557 #endif  /* SCM_TAGS_H */
 558
 559 /*
 560   Local Variables:
 561   c-file-style: "gnu"
 562   End:
 563 */