1 /* This is a minimally edited version of Guile's tags.h. */
6 /* Copyright 1995, 1999 Free Software Foundation, Inc.
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22 * As a special exception, the Free Software Foundation gives permission
23 * for additional uses of the text contained in its release of GUILE.
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
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48 /** This file defines the format of SCM values and cons pairs.
49 ** It is here that tag bits are assigned for various purposes.
55 * 000 -- a non-immediate value. Points into the pair heap.
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).
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.
67 * 010 -- the tag for immediate, exact integers.
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.
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.
82 #define scm_tc3_cons 0
83 #define scm_tc3_cons_gloc 1
84 #define scm_tc3_closure 3
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
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
114 #define scm_tc7_smob 127
115 #define scm_tc_free_cell 127
117 #define scm_tc16_flo 0x017f
118 #define scm_tc_flo 0x017fL
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)
125 #define scm_tc16_bigpos 0x027f
126 #define scm_tc16_bigneg 0x037f
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)
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
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
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.
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
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
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
173 #define scm_tcs_symbols scm_tc7_ssymbol:case scm_tc7_msymbol
175 #define scm_tcs_bignums tc16_bigpos:case tc16_bigneg
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).
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.
194 #define SCM2PTR(x) ((int)(x) >> 3)
195 #define PTR2SCM(x) (((SCM)(x)) << 3)
196 #define SCM_POINTERS_MUNGED
198 #define SCM2PTR(x) (x)
199 #define PTR2SCM(x) ((SCM)(x))
200 #endif /* def _UNICOS */
204 /* Immediate? Predicates
206 #define SCM_IMP(x) (6 & (int)(x))
207 #define SCM_NIMP(x) (!SCM_IMP(x))
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)
222 /* Local Environment Structure
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))
235 /* Immediate Symbols, Special Symbols, Flags (various constants).
238 /* ISYMP tests for ISPCSYM and ISYM */
239 #define SCM_ISYMP(n) ((0x187 & (int)(n))==4)
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)
249 /* This table must agree with the declarations
250 * in repl.c: {Names of immediate symbols}.
252 * These are used only in eval but their values
253 * have to be allocated here.
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
275 /* Important immediates
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)
284 #define SCM_EOL SCM_BOOL_F
286 #define SCM_EOL SCM_MAKIFLAG(SCM_NUM_ISYMS+4)
289 #define SCM_UNSPECIFIED SCM_MAKIFLAG(SCM_NUM_ISYMS+5)
293 /* Heap Pairs and the Empty List Predicates
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))
302 #define SCM_UNBNDP(x) (SCM_UNDEFINED==(x))
306 /* Testing and Changing GC Marks in Various Standard Positions
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)
316 /* Extracting Tag Bits, With or Without GC Safety and Optional Bits
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))
326 /* Two slightly extensible types: smobs and ptobs.
329 #define SCM_SMOBNUM(x) (0x0ff & (CAR(x)>>8));
330 #define SCM_PTOBNUM(x) (0x0ff & (CAR(x)>>8));
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)))
342 #define SCM_LVECTORP(x) (TYP7(x)==tc7_lvector)
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)
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)
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))
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
373 #define SCM_FREEP(x) (CAR(x)==tc_free_cell)
374 #define SCM_NFREEP(x) (!FREEP(x))
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