gdb/scm-tags.h

   1 /* This is a minimally edited version of Guile's tags.h. */
   2 /* classes: h_files */
   3
   4 #ifndef TAGSH
   5 #define TAGSH
   6 /*      Copyright (C) 1995 Free Software Foundation, Inc.
   7
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2, or (at your option)
  11  * any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place - Suite 330, 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 \f
  47
  48 /** This file defines the format of SCM values and cons pairs.
  49  ** It is here that tag bits are assigned for various purposes.
  50  **/
  51 \f
  52
  53 /* Three Bit Tags
  54
  55  * 000 -- a non-immediate value.  Points into the pair heap.
  56  *
  57  * 001 -- a gloc (i.e., a resolved global variable in a CAR in a code graph)
  58  *        or the CAR of an object handle (i.e., the tagged pointer to the
  59  *        vtable part of a user-defined object).
  60  *
  61  *        If X has this tag, the value at CDAR(X - 1) distinguishes
  62  *        glocs from object handles.  The distinction only needs
  63  *        to be made in a few places.  Only a few parts of the code know
  64  *        about glocs.  In most cases, when a value in the CAR of a pair
  65  *        has the tag 001, it means that the pair is an object handle.
  66  *
  67  * 010 -- the tag for immediate, exact integers.
  68  *
  69  * 011 -- in the CAR of a pair, this tag indicates that the pair is a closure.
  70  *        The remaining bits of the CAR are a pointer into the pair heap
  71  *        to the code graph for the closure.
  72  *
  73  * 1xy -- an extension tag which means that there is a five or six bit
  74  *        tag to the left of the low three bits.  See the nice diagrams
  75  *        in ../doc/code.doc if you want to know what the bits mean.
  76  */
  77 \f
  78
  79
  80
  81
  82 #define scm_tc3_cons            0
  83 #define scm_tc3_cons_gloc       1
  84 #define scm_tc3_closure         3
  85
  86 #define scm_tc7_ssymbol         5
  87 #define scm_tc7_msymbol         7
  88 #define scm_tc7_string          13
  89 #define scm_tc7_bvect           15
  90 #define scm_tc7_vector          21
  91 #define scm_tc7_lvector         23
  92 #define scm_tc7_ivect           29
  93 #define scm_tc7_uvect           31
  94 /* spare 37 39 */
  95 #define scm_tc7_fvect           45
  96 #define scm_tc7_dvect           47
  97 #define scm_tc7_cvect           53
  98 #define scm_tc7_port            55
  99 #define scm_tc7_contin          61
 100 #define scm_tc7_cclo            63
 101 /* spare 69 71 77 79 */
 102 #define scm_tc7_subr_0          85
 103 #define scm_tc7_subr_1          87
 104 #define scm_tc7_cxr             93
 105 #define scm_tc7_subr_3          95
 106 #define scm_tc7_subr_2          101
 107 #define scm_tc7_asubr           103
 108 #define scm_tc7_subr_1o         109
 109 #define scm_tc7_subr_2o         111
 110 #define scm_tc7_lsubr_2         117
 111 #define scm_tc7_lsubr           119
 112 #define scm_tc7_rpsubr          125
 113
 114 #define scm_tc7_smob            127
 115 #define scm_tc_free_cell        127
 116
 117 #define scm_tc16_flo            0x017f
 118 #define scm_tc_flo              0x017fL
 119
 120 #define SCM_REAL_PART           (1L<<16)
 121 #define SCM_IMAG_PART           (2L<<16)
 122 #define scm_tc_dblr             (scm_tc16_flo|REAL_PART)
 123 #define scm_tc_dblc             (scm_tc16_flo|REAL_PART|IMAG_PART)
 124
 125 #define scm_tc16_bigpos         0x027f
 126 #define scm_tc16_bigneg         0x037f
 127
 128 #define scm_tc16_fport          (scm_tc7_port + 0*256L)
 129 #define scm_tc16_pipe           (scm_tc7_port + 1*256L)
 130 #define scm_tc16_strport        (scm_tc7_port + 2*256L)
 131 #define scm_tc16_sfport         (scm_tc7_port + 3*256L)
 132
 133
 134
 135 /* For cons pairs with immediate values in the CAR */
 136 #define scm_tcs_cons_imcar 2:case 4:case 6:case 10:\
 137  case 12:case 14:case 18:case 20:\
 138  case 22:case 26:case 28:case 30:\
 139  case 34:case 36:case 38:case 42:\
 140  case 44:case 46:case 50:case 52:\
 141  case 54:case 58:case 60:case 62:\
 142  case 66:case 68:case 70:case 74:\
 143  case 76:case 78:case 82:case 84:\
 144  case 86:case 90:case 92:case 94:\
 145  case 98:case 100:case 102:case 106:\
 146  case 108:case 110:case 114:case 116:\
 147  case 118:case 122:case 124:case 126
 148
 149 /* For cons pairs with non-immediate values in the CAR */
 150 #define scm_tcs_cons_nimcar 0:case 8:case 16:case 24:\
 151  case 32:case 40:case 48:case 56:\
 152  case 64:case 72:case 80:case 88:\
 153  case 96:case 104:case 112:case 120
 154
 155 /* A CONS_GLOC occurs in code.  It's CAR is a pointer to the
 156  * CDR of a variable.  The low order bits of the CAR are 001.
 157  * The CDR of the gloc is the code continuation.
 158  */
 159 #define scm_tcs_cons_gloc 1:case 9:case 17:case 25:\
 160  case 33:case 41:case 49:case 57:\
 161  case 65:case 73:case 81:case 89:\
 162  case 97:case 105:case 113:case 121
 163
 164 #define scm_tcs_closures   3:case 11:case 19:case 27:\
 165  case 35:case 43:case 51:case 59:\
 166  case 67:case 75:case 83:case 91:\
 167  case 99:case 107:case 115:case 123
 168
 169 #define scm_tcs_subrs scm_tc7_asubr:case scm_tc7_subr_0:case scm_tc7_subr_1:case scm_tc7_cxr:\
 170  case scm_tc7_subr_3:case scm_tc7_subr_2:case scm_tc7_rpsubr:case scm_tc7_subr_1o:\
 171  case scm_tc7_subr_2o:case scm_tc7_lsubr_2:case scm_tc7_lsubr
 172
 173 #define scm_tcs_symbols scm_tc7_ssymbol:case scm_tc7_msymbol
 174
 175 #define scm_tcs_bignums tc16_bigpos:case tc16_bigneg
 176 \f
 177
 178
 179 /* References to objects are of type SCM.  Values may be non-immediate
 180  * (pointers) or immediate (encoded, immutable, scalar values that fit
 181  * in an SCM variable).
 182  */
 183
 184 typedef long SCM;
 185
 186 /* Cray machines have pointers that are incremented once for each word,
 187  * rather than each byte, the 3 most significant bits encode the byte
 188  * within the word.  The following macros deal with this by storing the
 189  * native Cray pointers like the ones that looks like scm expects.  This
 190  * is done for any pointers that might appear in the car of a scm_cell, pointers
 191  * to scm_vector elts, functions, &c are not munged.
 192  */
 193 #ifdef _UNICOS
 194 #define SCM2PTR(x) ((int)(x) >> 3)
 195 #define PTR2SCM(x) (((SCM)(x)) << 3)
 196 #define SCM_POINTERS_MUNGED
 197 #else
 198 #define SCM2PTR(x) (x)
 199 #define PTR2SCM(x) ((SCM)(x))
 200 #endif /* def _UNICOS */
 201 \f
 202
 203
 204 /* Immediate? Predicates
 205  */
 206 #define SCM_IMP(x)      (6 & (int)(x))
 207 #define SCM_NIMP(x)     (!SCM_IMP(x))
 208 \f
 209
 210
 211 enum scm_tags
 212   {
 213     scm_tc8_char = 0xf4
 214   };
 215
 216 #define SCM_ITAG8(X)            ((int)(X) & 0xff)
 217 #define SCM_MAKE_ITAG8(X, TAG)  (((X)<<8) + TAG)
 218 #define SCM_ITAG8_DATA(X)       ((X)>>8)
 219 \f
 220
 221
 222 /* Local Environment Structure
 223  */
 224 #define SCM_ILOCP(n)            ((0xff & (int)(n))==0xfc)
 225 #define SCM_ILOC00              (0x000000fcL)
 226 #define SCM_IDINC               (0x00100000L)
 227 #define SCM_ICDR                (0x00080000L)
 228 #define SCM_IFRINC              (0x00000100L)
 229 #define SCM_IDSTMSK             (-SCM_IDINC)
 230 #define SCM_IFRAME(n)           ((int)((SCM_ICDR-SCM_IFRINC)>>8) & ((int)(n)>>8))
 231 #define SCM_IDIST(n)            (((unsigned long)(n))>>20)
 232 #define SCM_ICDRP(n)            (SCM_ICDR & (n))
 233 \f
 234
 235 /* Immediate Symbols, Special Symbols, Flags (various constants).
 236  */
 237
 238 /* ISYMP tests for ISPCSYM and ISYM */
 239 #define SCM_ISYMP(n)            ((0x187 & (int)(n))==4)
 240
 241 /* IFLAGP tests for ISPCSYM, ISYM and IFLAG */
 242 #define SCM_IFLAGP(n)           ((0x87 & (int)(n))==4)
 243 #define SCM_ISYMNUM(n)          ((int)((n)>>9))
 244 #define SCM_ISYMCHARS(n)        (scm_isymnames[SCM_ISYMNUM(n)])
 245 #define SCM_MAKSPCSYM(n)        (((n)<<9)+((n)<<3)+4L)
 246 #define SCM_MAKISYM(n)          (((n)<<9)+0x74L)
 247 #define SCM_MAKIFLAG(n)         (((n)<<9)+0x174L)
 248
 249 /* This table must agree with the declarations
 250  * in repl.c: {Names of immediate symbols}.
 251  *
 252  * These are used only in eval but their values
 253  * have to be allocated here.
 254  *
 255  */
 256
 257 #define SCM_IM_AND              SCM_MAKSPCSYM(0)
 258 #define SCM_IM_BEGIN            SCM_MAKSPCSYM(1)
 259 #define SCM_IM_CASE             SCM_MAKSPCSYM(2)
 260 #define SCM_IM_COND             SCM_MAKSPCSYM(3)
 261 #define SCM_IM_DO               SCM_MAKSPCSYM(4)
 262 #define SCM_IM_IF               SCM_MAKSPCSYM(5)
 263 #define SCM_IM_LAMBDA           SCM_MAKSPCSYM(6)
 264 #define SCM_IM_LET              SCM_MAKSPCSYM(7)
 265 #define SCM_IM_LETSTAR          SCM_MAKSPCSYM(8)
 266 #define SCM_IM_LETREC           SCM_MAKSPCSYM(9)
 267 #define SCM_IM_OR               SCM_MAKSPCSYM(10)
 268 #define SCM_IM_QUOTE            SCM_MAKSPCSYM(11)
 269 #define SCM_IM_SET              SCM_MAKSPCSYM(12)
 270 #define SCM_IM_DEFINE           SCM_MAKSPCSYM(13)
 271 #define SCM_IM_APPLY            SCM_MAKISYM(14)
 272 #define SCM_IM_CONT             SCM_MAKISYM(15)
 273 #define SCM_NUM_ISYMS 16
 274
 275 /* Important immediates
 276  */
 277
 278 #define SCM_BOOL_F              SCM_MAKIFLAG(SCM_NUM_ISYMS+0)
 279 #define SCM_BOOL_T              SCM_MAKIFLAG(SCM_NUM_ISYMS+1)
 280 #define SCM_UNDEFINED           SCM_MAKIFLAG(SCM_NUM_ISYMS+2)
 281 #define SCM_EOF_VAL             SCM_MAKIFLAG(SCM_NUM_ISYMS+3)
 282
 283 #ifdef SICP
 284 #define SCM_EOL                 SCM_BOOL_F
 285 #else
 286 #define SCM_EOL                 SCM_MAKIFLAG(SCM_NUM_ISYMS+4)
 287 #endif
 288
 289 #define SCM_UNSPECIFIED         SCM_MAKIFLAG(SCM_NUM_ISYMS+5)
 290 \f
 291
 292
 293 /* Heap Pairs and the Empty List Predicates
 294  */
 295 #define SCM_NULLP(x)    (SCM_EOL == (x))
 296 #define SCM_NNULLP(x)   (SCM_EOL != (x))
 297 #define SCM_CELLP(x)    (!SCM_NCELLP(x))
 298 #define SCM_NCELLP(x)   ((sizeof(scm_cell)-1) & (int)(x))
 299 \f
 300
 301
 302 #define SCM_UNBNDP(x)   (SCM_UNDEFINED==(x))
 303 \f
 304
 305
 306 /* Testing and Changing GC Marks in Various Standard Positions
 307  */
 308 #define SCM_GCMARKP(x)          (1 & (int)SCM_CDR(x))
 309 #define SCM_GC8MARKP(x)         (0x80 & (int)SCM_CAR(x))
 310 #define SCM_SETGCMARK(x)        (SCM_CDR(x) |= 1)
 311 #define SCM_CLRGCMARK(x)        (SCM_CDR(x) &= ~1L)
 312 #define SCM_SETGC8MARK(x)       (SCM_CAR(x) |= 0x80)
 313 #define SCM_CLRGC8MARK(x)       (SCM_CAR(x) &= ~0x80L)
 314 \f
 315
 316 /* Extracting Tag Bits, With or Without GC Safety and Optional Bits
 317  */
 318 #define SCM_TYP3(x)             (7 & (int)SCM_CAR(x))
 319 #define SCM_TYP7(x)             (0x7f & (int)SCM_CAR(x))
 320 #define SCM_TYP7S(x)            (0x7d & (int)SCM_CAR(x))
 321 #define SCM_TYP16(x)            (0xffff & (int)SCM_CAR(x))
 322 #define SCM_TYP16S(x)           (0xfeff & (int)SCM_CAR(x))
 323 #define SCM_GCTYP16(x)          (0xff7f & (int)SCM_CAR(x))
 324 \f
 325
 326 /* Two slightly extensible types: smobs and ptobs.
 327
 328  */
 329 #define SCM_SMOBNUM(x) (0x0ff & (CAR(x)>>8));
 330 #define SCM_PTOBNUM(x) (0x0ff & (CAR(x)>>8));
 331 \f
 332
 333
 334
 335 #define SCM_DIRP(x) (SCM_NIMP(x) && (TYP16(x)==(scm_tc16_dir)))
 336 #define SCM_OPDIRP(x) (SCM_NIMP(x) && (CAR(x)==(scm_tc16_dir | OPN)))
 337 \f
 338
 339
 340 /* Lvectors
 341  */
 342 #define SCM_LVECTORP(x) (TYP7(x)==tc7_lvector)
 343 \f
 344
 345 #if 0
 346 \f
 347 /* Sockets
 348  */
 349 #define tc_socket (tc7_port | OPN)
 350 #define SCM_SOCKP(x) (((0x7f | OPN | RDNG | WRTNG) & CAR(x))==(tc_socket))
 351 #define SCM_SOCKTYP(x) (CAR(x)>>24)
 352 \f
 353
 354
 355 extern int scm_tc16_key_vector;
 356 #define SCM_KEYVECP(X)   (scm_tc16_key_vector == TYP16 (X))
 357 #define SCM_KEYVECLEN(OBJ) (((unsigned long)CAR (obj)) >> 16)
 358 \f
 359
 360 #define SCM_MALLOCDATA(obj) ((char *)CDR(obj))
 361 #define SCM_MALLOCLEN(obj) (((unsigned long)CAR (obj)) >> 16)
 362 #define SCM_WORDDATA(obj)  (CDR (obj))
 363
 364
 365 #define SCM_BYTECODEP(X) ((TYP7 (X) == tc7_cclo) && (CCLO_SUBR (X) == rb_proc))
 366 #define SCM_BYTECODE_CONSTANTS(X) (VELTS(X)[1])
 367 #define SCM_BYTECODE_CODE(X) (VELTS(X)[2])
 368 #define SCM_BYTECODE_NAME(X) (VELTS(X)[3])
 369 #define SCM_BYTECODE_BCODE(X) (VELTS(X)[4])
 370 #define SCM_BYTECODE_ELTS 5
 371 \f
 372
 373 #define SCM_FREEP(x) (CAR(x)==tc_free_cell)
 374 #define SCM_NFREEP(x) (!FREEP(x))
 375 \f
 376 #endif /* 0 */
 377 \f
 378 #ifdef __STDC__
 379
 380 #else /* STDC */
 381
 382 #endif /* STDC */
 383
 384
 385 #endif /* TAGSH */