libguile/tags.h

   1 /* classes: h_files */
   2
   3 #ifndef TAGSH
   4 #define TAGSH
   5 /* Copyright (C) 1995, 1996, 1997, 1998, 1999 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 /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
  47    gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
  48
  49 \f
  50
  51 /** This file defines the format of SCM values and cons pairs.
  52  ** It is here that tag bits are assigned for various purposes.
  53  **/
  54
  55 \f
  56
  57 /* In the beginning was the Word:
  58  */
  59 typedef long SCM;
  60
  61
  62
  63 /* Cray machines have pointers that are incremented once for each word,
  64  * rather than each byte, the 3 most significant bits encode the byte
  65  * within the word.  The following macros deal with this by storing the
  66  * native Cray pointers like the ones that looks like scm expects.  This
  67  * is done for any pointers that might appear in the car of a scm_cell, pointers
  68  * to scm_vector elts, functions, &c are not munged.
  69  */
  70 #ifdef _UNICOS
  71 # define SCM2PTR(x) ((int) (x) >> 3)
  72 # define PTR2SCM(x) (((SCM) (x)) << 3)
  73 # define SCM_POINTERS_MUNGED
  74 #else
  75 # define SCM2PTR(x) (x)
  76 # define PTR2SCM(x) ((SCM) (x))
  77 #endif /* def _UNICOS */
  78
  79 \f
  80 /* SCM variables can contain:
  81  *
  82  * Non-objects -- meaning that the tag-related macros don't apply to them
  83  * in the usual way.
  84  *
  85  * Immediates -- meaning that the variable contains an entire Scheme object.
  86  *
  87  * Non-immediates -- meaning that the variable holds a (possibly
  88  * tagged) pointer into the cons pair heap.
  89  *
  90  * Non-objects are distinguished from other values by careful coding
  91  * only (i.e., programmers must keep track of any SCM variables they
  92  * create that don't contain ordinary scheme values).
  93  *
  94  * All immediates and non-immediates must have a 0 in bit 0.  Only
  95  * non-object values can have a 1 in bit 0.  In some cases, bit 0 of a
  96  * word in the heap is used for the GC tag so during garbage
  97  * collection, that bit might be 1 even in an immediate or
  98  * non-immediate value.  In other cases, bit 0 of a word in the heap
  99  * is used to tag a pointer to a GLOC (VM global variable address) or
 100  * the header of a struct.  But whenever an SCM variable holds a
 101  * normal Scheme value, bit 0 is 0.
 102  *
 103  * Immediates and non-immediates are distinguished by bits two and four.
 104  * Immediate values must have a 1 in at least one of those bits.  Does
 105  * this (or any other detail of tagging) seem arbitrary?  Try changing it!
 106  * (Not always impossible but it is fair to say that many details of tags
 107  * are mutually dependent).  */
 108
 109 #define SCM_IMP(x)              (6 & (SCM) (x))
 110 #define SCM_NIMP(x)             (!SCM_IMP (x))
 111
 112 /* Here is a summary of tagging in SCM values as they might occur in
 113  * SCM variables or in the heap.
 114  *
 115  * low bits    meaning
 116  *
 117  *
 118  * 0            Most objects except...
 119  * 1            ...glocs and structs (this tag valid only in a SCM_CAR or
 120  *              in the header of a struct's data).
 121  *
 122  * 00           heap addresses and many immediates (not integers)
 123  * 01           glocs/structs, some tc7_ codes
 124  * 10           immediate integers
 125  * 11           various tc7_ codes including, tc16_ codes.
 126  *
 127  *
 128  * 000          heap address
 129  * 001          glocs/structs
 130  * 010          integer
 131  * 011          closure
 132  * 100          immediates
 133  * 101          tc7_
 134  * 110          integer
 135  * 111          tc7_
 136  *
 137  *
 138  * 100 --- IMMEDIATES
 139  *
 140  * Looking at the seven final bits of an immediate:
 141  *
 142  * 0000-100     short instruction
 143  * 0001-100     short instruction
 144  * 0010-100     short instruction
 145  * 0011-100     short instruction
 146  * 0100-100     short instruction
 147  * 0101-100     short instruction
 148  * 0110-100     various immediates and long instructions
 149  * 0111-100     short instruction
 150  * 1000-100     short instruction
 151  * 1001-100     short instruction
 152  * 1010-100     short instruction
 153  * 1011-100     short instruction
 154  * 1100-100     short instruction
 155  * 1101-100     short instruction
 156  * 1110-100     immediate characters
 157  * 1111-100     ilocs
 158  *
 159  * Some of the 0110100 immediates are long instructions (they dispatch
 160  * in two steps compared to one step for a short instruction).
 161  * The two steps are, (1) dispatch on 7 bits to the long instruction
 162  * handler, (2) dispatch on 7 additional bits.
 163  *
 164  * One way to think of it is that there are 128 short instructions,
 165  * with the 13 immediates above being some of the most interesting.
 166  *
 167  * Also noteworthy are the groups of 16 7-bit instructions implied by
 168  * some of the 3-bit tags.   For example, closure references consist
 169  * of an 8-bit aligned address tagged with 011.  There are 16 identical 7-bit
 170  * instructions, all ending 011, which are invoked by evaluating closures.
 171  *
 172  * In other words, if you hand the evaluator a closure, the evaluator
 173  * treats the closure as a graph of virtual machine instructions.
 174  * A closure is a pair with a pointer to the body of the procedure
 175  * in the CDR and a pointer to the environment of the closure in the CAR.
 176  * The environment pointer is tagged 011 which implies that the least
 177  * significant 7 bits of the environment pointer also happen to be
 178  * a virtual machine instruction we could call "SELF" (for self-evaluating
 179  * object).
 180  *
 181  * A less trivial example are the 16 instructions ending 000.  If those
 182  * bits tag the CAR of a pair, then evidently the pair is an ordinary
 183  * cons pair and should be evaluated as a procedure application.  The sixteen,
 184  * 7-bit 000 instructions are all "NORMAL-APPLY"  (Things get trickier.
 185  * For example, if the CAR of a procedure application is a symbol, the NORMAL-APPLY
 186  * instruction will, as a side effect, overwrite that CAR with a new instruction
 187  * that contains a cached address for the variable named by the symbol.)
 188  *
 189  * Here is a summary of tags in the CAR of a non-immediate:
 190  *
 191  *   HEAP CELL: G=gc_mark; 1 during mark, 0 other times.
 192  *
 193  * cons    ..........SCM car..............0  ...........SCM cdr.............G
 194  * gloc    ..........SCM vcell..........001  ...........SCM cdr.............G
 195  * struct  ..........void * type........001  ...........void * data.........G
 196  * closure ..........SCM code...........011  ...........SCM env.............G
 197  * tc7     .........long length....Gxxxx1S1  ..........void *data............
 198  *
 199  *
 200  *
 201  * 101 & 111 --- tc7_ types
 202  *
 203  *              tc7_tags are 7 bit tags ending in 1x1.  These tags
 204  *              occur only in the CAR of heap cells, and have the
 205  *              handy property that all bits of the CAR above the
 206  *              bottom eight can be used to store a length, thus
 207  *              saving a word in the body itself.  Thus, we use them
 208  *              for strings, symbols, and vectors (among other
 209  *              things).
 210  *
 211  *              SCM_LENGTH returns the bits in "length" (see the diagram).
 212  *              SCM_CHARS returns the data cast to "char *"
 213  *              SCM_CDR returns the data cast to "SCM"
 214  *              TYP7(X) returns bits 0...6 of SCM_CAR (X)
 215  *
 216  *              For the interpretation of SCM_LENGTH and SCM_CHARS
 217  *              that applies to a particular type, see the header file
 218  *              for that type.
 219  *
 220  *              Sometimes we choose the bottom seven bits carefully,
 221  *              so that the 2-valued bit (called S bit) can be masked
 222  *              off to reveal a common type.
 223  *
 224  *              TYP7S(X) returns TYP7, but masking out the option bit S.
 225  *
 226  *              For example, all strings have 0010 in the 'xxxx' bits
 227  *              in the diagram above, the S bit says whether it's a
 228  *              substring.
 229  *
 230  *              for example:
 231  *                                                      S
 232  *                      scm_tc7_string          = G0010101
 233  *                      scm_tc7_substring       = G0010111
 234  *
 235  *              TYP7S turns both string tags into tc7_string; thus,
 236  *              testing TYP7S against tc7_string is a quick way to
 237  *              test for any kind of string, shared or unshared.
 238  *
 239  *              Some TC7 types are subdivided into 256 subtypes giving
 240  *              rise to the macros:
 241  *
 242  *              TYP16
 243  *              TYP16S
 244  *              GCTYP16
 245  *
 246  *              TYP16S functions similarly wrt to TYP16 as TYP7S to TYP7,
 247  *              but a different option bit is used (bit 2 for TYP7S,
 248  *              bit 8 for TYP16S).
 249  * */
 250
 251
 252
 253 \f
 254 /* {Non-immediate values.}
 255  *
 256  * If X is non-immediate, it is necessary to look at SCM_CAR (X) to
 257  * figure out Xs type.  X may be a cons pair, in which case the value
 258  * SCM_CAR (x) will be either an immediate or non-immediate value.  X
 259  * may be something other than a cons pair, in which case the value
 260  * SCM_CAR (x) will be a non-object value.
 261  *
 262  * All immediates and non-immediates have a 0 in bit 0.  We
 263  * additionally preserve the invariant that all non-object values
 264  * stored in the SCM_CAR of a non-immediate object have a 1 in bit 1:
 265  */
 266
 267 #define SCM_SLOPPY_NCONSP(x) (1 & SCM_CAR (x))
 268 #define SCM_SLOPPY_CONSP(x)  (!SCM_SLOPPY_NCONSP(x))
 269
 270 #define SCM_NCONSP(x) (SCM_IMP (x) || SCM_SLOPPY_NCONSP(x))
 271 #define SCM_CONSP(x)  (SCM_NIMP (x) && SCM_SLOPPY_CONSP(x))
 272
 273
 274 /* SCM_ECONSP should be used instead of SCM_CONSP at places where GLOCS
 275  * can be expected to occur.
 276  */
 277 #define SCM_ECONSP(x) (SCM_NIMP (x) \
 278                        && (SCM_SLOPPY_CONSP (x) \
 279                            || (SCM_TYP3 (x) == 1 \
 280                                && SCM_CDR (SCM_CAR (x) - 1) != 0)))
 281 #define SCM_NECONSP(x) (SCM_IMP (x) \
 282                         || (SCM_SLOPPY_NCONSP (x) \
 283                             && (SCM_TYP3 (x) != 1 \
 284                                 || SCM_CDR (SCM_CAR (x) - 1) == 0)))
 285
 286 \f
 287
 288 #define SCM_CELLP(x)    (!SCM_NCELLP (x))
 289 #define SCM_NCELLP(x)   ((sizeof (scm_cell) - 1) & (SCM) (x))
 290
 291 /* See numbers.h for macros relating to immediate integers.
 292  */
 293
 294 #define SCM_ITAG3(x)            (7 & (SCM) x)
 295 #define SCM_TYP3(x)             (7 & SCM_CAR (x))
 296 #define scm_tc3_cons            0
 297 #define scm_tc3_cons_gloc       1
 298 #define scm_tc3_int_1           2
 299 #define scm_tc3_closure         3
 300 #define scm_tc3_imm24           4
 301 #define scm_tc3_tc7_1           5
 302 #define scm_tc3_int_2           6
 303 #define scm_tc3_tc7_2           7
 304
 305
 306 /*
 307  * Do not change the three bit tags.
 308  */
 309
 310
 311 #define SCM_TYP7(x)             (SCM_CAR (x) & 0x7f)
 312 #define SCM_TYP7S(x)            (SCM_CAR (x) & (0x7f & ~2))
 313
 314
 315 #define SCM_TYP16(x)            (0xffff & SCM_CAR (x))
 316 #define SCM_TYP16S(x)           (0xfeff & SCM_CAR (x))
 317 #define SCM_GCTYP16(x)          (0xff7f & SCM_CAR (x))
 318
 319
 320
 321 /* Testing and Changing GC Marks in Various Standard Positions
 322  */
 323 #define SCM_GCMARKP(x)          (1 & SCM_CDR (x))
 324 #define SCM_GC8MARKP(x)         (0x80 & SCM_CAR (x))
 325 #define SCM_SETGCMARK(x)        SCM_SETOR_CDR (x, 1)
 326 #define SCM_CLRGCMARK(x)        SCM_SETAND_CDR (x, ~1L)
 327 #define SCM_SETGC8MARK(x)       SCM_SETOR_CAR (x, 0x80)
 328 #define SCM_CLRGC8MARK(x)       SCM_SETAND_CAR (x, ~0x80L)
 329
 330
 331 \f
 332
 333 /* couple */
 334 #define scm_tc7_ssymbol         5
 335 #define scm_tc7_msymbol         7
 336
 337 /* couple */
 338 #define scm_tc7_vector          13
 339 #define scm_tc7_wvect           15
 340
 341 /* couple */
 342 #define scm_tc7_string          21
 343 #define scm_tc7_substring       23
 344
 345 /* Many of the following should be turned
 346  * into structs or smobs.  We need back some
 347  * of these 7 bit tags!
 348  */
 349 #define scm_tc7_pws             31
 350 #define scm_tc7_lvector         39
 351
 352 #ifdef HAVE_ARRAYS
 353 #define scm_tc7_llvect          29
 354 #define scm_tc7_uvect           37
 355 #define scm_tc7_fvect           45
 356 #define scm_tc7_dvect           47
 357 #define scm_tc7_cvect           53
 358 #define scm_tc7_svect           55
 359 #define scm_tc7_bvect           71
 360 #define scm_tc7_byvect          77
 361 #define scm_tc7_ivect           79
 362 #endif
 363
 364 #define scm_tc7_contin          61
 365 #define scm_tc7_cclo            63
 366 #define scm_tc7_rpsubr          69
 367 #define scm_tc7_subr_0          85
 368 #define scm_tc7_subr_1          87
 369 #define scm_tc7_cxr             93
 370 #define scm_tc7_subr_3          95
 371 #define scm_tc7_subr_2          101
 372 #define scm_tc7_asubr           103
 373 #define scm_tc7_subr_1o         109
 374 #define scm_tc7_subr_2o         111
 375 #define scm_tc7_lsubr_2         117
 376 #define scm_tc7_lsubr           119
 377
 378
 379 /* There are 256 port subtypes.  Here are the first few.
 380  * These must agree with the init function in ports.c
 381  */
 382 #define scm_tc7_port            125
 383
 384 #define scm_tc16_fport          (scm_tc7_port + 0 * 256L)
 385 /* scm_tc16_pipe was here.  */
 386 #define scm_tc16_strport        (scm_tc7_port + 2 * 256L)
 387 #define scm_tc16_sfport         (scm_tc7_port + 3 * 256L)
 388
 389
 390 /* There are 256 smob subtypes.  Here are the first four.
 391  */
 392
 393 #define scm_tc7_smob            127 /* DO NOT CHANGE [**] */
 394
 395 /* [**] If you change scm_tc7_smob, you must also change
 396  * the places it is hard coded in this file and possibly others.
 397  */
 398
 399
 400 /* scm_tc_free_cell is also the 0th smob type.  We place this
 401  * in free cells to tell the conservative marker not to trace it.
 402  */
 403 #define scm_tc_free_cell        127
 404
 405 /* The 1st smob type:
 406  */
 407 #define scm_tc16_flo            0x017f
 408 #define scm_tc_flo              0x017fL
 409
 410 /* Some option bits begeinning at bit 16 of scm_tc16_flo:
 411  */
 412 #define SCM_REAL_PART           (1L << 16)
 413 #define SCM_IMAG_PART           (2L << 16)
 414 #define scm_tc_dblr             (scm_tc16_flo | SCM_REAL_PART)
 415 #define scm_tc_dblc             (scm_tc16_flo | SCM_REAL_PART | SCM_IMAG_PART)
 416
 417
 418 /* Smob types 2 and 3:
 419  */
 420 #define scm_tc16_bigpos         0x027f
 421 #define scm_tc16_bigneg         0x037f
 422
 423 /* Smob type 4: this is allocated, but not initialized cells;
 424    this is required to prevent the gc from hosing your cells if
 425    you have to allocate while creating the cell*/
 426
 427 #define scm_tc16_allocated      0x047f
 428
 429
 430 \f
 431 /* {Immediate Values}
 432  */
 433
 434 enum scm_tags
 435 {
 436   scm_tc8_char = 0xf4,
 437   scm_tc8_iloc = 0xfc
 438 };
 439
 440 #define SCM_ITAG8(X)            ((SCM) (X) & 0xff)
 441 #define SCM_MAKE_ITAG8(X, TAG)  (((X) << 8) + TAG)
 442 #define SCM_ITAG8_DATA(X)       ((X) >> 8)
 443
 444
 445 \f
 446 /* Immediate Symbols, Special Symbols, Flags (various constants).
 447  */
 448
 449 /* SCM_ISYMP tests for ISPCSYM and ISYM */
 450 #define SCM_ISYMP(n)            ((0x187 & (SCM) (n)) == 4)
 451
 452 /* SCM_IFLAGP tests for ISPCSYM, ISYM and IFLAG */
 453 #define SCM_IFLAGP(n)           ((0x87 & (SCM) (n)) == 4)
 454 #define SCM_ISYMNUM(n)          ((SCM) ((n) >> 9))
 455 #define SCM_ISYMCHARS(n)        (scm_isymnames[SCM_ISYMNUM (n)])
 456 #define SCM_MAKSPCSYM(n)        (((n) << 9) + ((n) << 3) + 4L)
 457 #define SCM_MAKISYM(n)          (((n) << 9) + 0x74L)
 458 #define SCM_MAKIFLAG(n)         (((n) << 9) + 0x174L)
 459
 460 extern char *scm_isymnames[];   /* defined in print.c */
 461
 462 /* This table must agree with the declarations
 463  * in repl.c: {Names of immediate symbols}.
 464  *
 465  * These are used only in eval but their values
 466  * have to be allocated here.
 467  *
 468  */
 469
 470 #define SCM_IM_AND              SCM_MAKSPCSYM (0)
 471 #define SCM_IM_BEGIN            SCM_MAKSPCSYM (1)
 472 #define SCM_IM_CASE             SCM_MAKSPCSYM (2)
 473 #define SCM_IM_COND             SCM_MAKSPCSYM (3)
 474 #define SCM_IM_DO               SCM_MAKSPCSYM (4)
 475 #define SCM_IM_IF               SCM_MAKSPCSYM (5)
 476 #define SCM_IM_LAMBDA           SCM_MAKSPCSYM (6)
 477 #define SCM_IM_LET              SCM_MAKSPCSYM (7)
 478 #define SCM_IM_LETSTAR          SCM_MAKSPCSYM (8)
 479 #define SCM_IM_LETREC           SCM_MAKSPCSYM (9)
 480 #define SCM_IM_OR               SCM_MAKSPCSYM (10)
 481 #define SCM_IM_QUOTE            SCM_MAKSPCSYM (11)
 482 #define SCM_IM_SET_X            SCM_MAKSPCSYM (12)
 483 #define SCM_IM_DEFINE           SCM_MAKSPCSYM (13)
 484 #define SCM_IM_APPLY            SCM_MAKISYM (14)
 485 #define SCM_IM_CONT             SCM_MAKISYM (15)
 486 #define SCM_BOOL_F              SCM_MAKIFLAG (16)
 487 #define SCM_BOOL_T              SCM_MAKIFLAG (17)
 488 #define SCM_UNDEFINED           SCM_MAKIFLAG (18)
 489 #define SCM_EOF_VAL             SCM_MAKIFLAG (19)
 490 #define SCM_EOL                 SCM_MAKIFLAG (20)
 491 #define SCM_UNSPECIFIED         SCM_MAKIFLAG (21)
 492 #define SCM_IM_DISPATCH         SCM_MAKISYM (22)
 493 #define SCM_IM_SLOT_REF         SCM_MAKISYM (23)
 494 #define SCM_IM_SLOT_SET_X       SCM_MAKISYM (24)
 495
 496 /* Multi-language support */
 497
 498 #define SCM_IM_NIL_COND         SCM_MAKISYM (25)
 499 #define SCM_IM_NIL_IFY          SCM_MAKISYM (26)
 500 #define SCM_IM_T_IFY            SCM_MAKISYM (27)
 501 #define SCM_IM_0_COND           SCM_MAKISYM (28)
 502 #define SCM_IM_0_IFY            SCM_MAKISYM (29)
 503 #define SCM_IM_1_IFY            SCM_MAKISYM (30)
 504 #define SCM_IM_BIND             SCM_MAKISYM (31)
 505
 506 #define SCM_IM_DELAY            SCM_MAKISYM (32)
 507
 508 /* When a variable is unbound this is marked by the SCM_UNDEFINED
 509  * value.  The following is an unbound value which can be handled on
 510  * the Scheme level, i.e., it can be stored in and retrieved from a
 511  * Scheme variable.  This value is only intended to mark an unbound
 512  * slot in GOOPS.  It is needed now, but we should probably rewrite
 513  * the code which handles this value in C so that SCM_UNDEFINED can be
 514  * used instead.  It is not ideal to let this kind of unique and
 515  * strange values loose on the Scheme level.
 516  */
 517 #define SCM_UNBOUND             SCM_MAKIFLAG (33)
 518
 519 #define SCM_UNBNDP(x)   (SCM_UNDEFINED == (x))
 520
 521 \f
 522
 523 /* Dispatching aids: */
 524
 525
 526 /* For cons pairs with immediate values in the CAR
 527  */
 528
 529 #define scm_tcs_cons_imcar 2:case 4:case 6:case 10:\
 530  case 12:case 14:case 18:case 20:\
 531  case 22:case 26:case 28:case 30:\
 532  case 34:case 36:case 38:case 42:\
 533  case 44:case 46:case 50:case 52:\
 534  case 54:case 58:case 60:case 62:\
 535  case 66:case 68:case 70:case 74:\
 536  case 76:case 78:case 82:case 84:\
 537  case 86:case 90:case 92:case 94:\
 538  case 98:case 100:case 102:case 106:\
 539  case 108:case 110:case 114:case 116:\
 540  case 118:case 122:case 124:case 126
 541
 542 /* For cons pairs with non-immediate values in the SCM_CAR
 543  */
 544 #define scm_tcs_cons_nimcar 0:case 8:case 16:case 24:\
 545  case 32:case 40:case 48:case 56:\
 546  case 64:case 72:case 80:case 88:\
 547  case 96:case 104:case 112:case 120
 548
 549 /* A CONS_GLOC occurs in code.  It's CAR is a pointer to the
 550  * CDR of a variable.  The low order bits of the CAR are 001.
 551  * The CDR of the gloc is the code continuation.
 552  */
 553 #define scm_tcs_cons_gloc 1:case 9:case 17:case 25:\
 554  case 33:case 41:case 49:case 57:\
 555  case 65:case 73:case 81:case 89:\
 556  case 97:case 105:case 113:case 121
 557
 558 #define scm_tcs_closures   3:case 11:case 19:case 27:\
 559  case 35:case 43:case 51:case 59:\
 560  case 67:case 75:case 83:case 91:\
 561  case 99:case 107:case 115:case 123
 562
 563 #define scm_tcs_subrs scm_tc7_asubr:case scm_tc7_subr_0:case scm_tc7_subr_1:case scm_tc7_cxr:\
 564  case scm_tc7_subr_3:case scm_tc7_subr_2:case scm_tc7_rpsubr:case scm_tc7_subr_1o:\
 565  case scm_tc7_subr_2o:case scm_tc7_lsubr_2:case scm_tc7_lsubr
 566
 567 #define scm_tcs_symbols scm_tc7_ssymbol:case scm_tc7_msymbol
 568
 569 #define scm_tcs_bignums scm_tc16_bigpos:case scm_tc16_bigneg
 570
 571 #endif  /* TAGSH */