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0f2d19dd JB |
1 | /* classes: h_files */ |
2 | ||
3 | #ifndef SYMBOLSH | |
4 | #define SYMBOLSH | |
7dc6e754 | 5 | /* Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc. |
0f2d19dd JB |
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 | |
82892bed JB |
19 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
20 | * Boston, MA 02111-1307 USA | |
0f2d19dd JB |
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. | |
82892bed | 44 | * If you do not wish that, delete this exception notice. */ |
0f2d19dd JB |
45 | \f |
46 | ||
b4309c3c | 47 | #include "libguile/__scm.h" |
0f2d19dd JB |
48 | \f |
49 | ||
50 | extern int scm_symhash_dim; | |
51 | ||
8ce94504 JB |
52 | /* SCM_LENGTH(SYM) is the length of SYM's name in characters, and |
53 | SCM_CHARS(SYM) is the address of the first character of SYM's name. | |
54 | ||
55 | Beyond that, there are two kinds of symbols: ssymbols and msymbols, | |
56 | distinguished by the 'S' bit in the type. | |
57 | ||
58 | Ssymbols are just uniquified strings. They have a length, chars, | |
59 | and that's it. They use the scm_tc7_ssymbol tag (S bit clear). | |
60 | ||
61 | Msymbols are symbols with extra slots. These slots hold a property | |
b7f3516f TT |
62 | list and a function value (for Emacs Lisp compatibility), and a hash |
63 | code. They use the scm_tc7_msymbol tag. | |
8ce94504 JB |
64 | |
65 | We'd like SCM_CHARS to work on msymbols just as it does on | |
66 | ssymbols, so we'll have it point to the symbol's name as usual, and | |
67 | store a pointer to the slots just before the name in memory. Thus, | |
68 | you have to do some casting and pointer arithmetic to find the | |
69 | slots; see the SCM_SLOTS macro. | |
70 | ||
71 | In practice, the slots always live just before the pointer to them. | |
72 | So why not ditch the pointer, and use negative indices to refer to | |
73 | the slots? That's a good question; ask the author. I think it was | |
74 | the cognac. */ | |
75 | ||
0f2d19dd JB |
76 | #define SCM_SYMBOLP(x) (SCM_TYP7S(x)==scm_tc7_ssymbol) |
77 | #define SCM_LENGTH(x) (((unsigned long)SCM_CAR(x))>>8) | |
78 | #define SCM_LENGTH_MAX (0xffffffL) | |
836669b8 | 79 | #define SCM_SETLENGTH(x, v, t) SCM_SETCAR((x), ((v)<<8)+(t)) |
0f2d19dd JB |
80 | #define SCM_SETCHARS SCM_SETCDR |
81 | #define SCM_CHARS(x) ((char *)(SCM_CDR(x))) | |
82 | #define SCM_UCHARS(x) ((unsigned char *)(SCM_CDR(x))) | |
83 | #define SCM_SLOTS(x) ((SCM *) (* ((SCM *)SCM_CHARS(x) - 1))) | |
b7f3516f | 84 | #define SCM_SYMBOL_SLOTS 4 |
0f2d19dd JB |
85 | #define SCM_SYMBOL_FUNC(X) (SCM_SLOTS(X)[0]) |
86 | #define SCM_SYMBOL_PROPS(X) (SCM_SLOTS(X)[1]) | |
87 | #define SCM_SYMBOL_HASH(X) (*(unsigned long*)(&SCM_SLOTS(X)[2])) | |
0f2d19dd | 88 | |
c2cb2500 JB |
89 | #define SCM_ROSTRINGP(x) ((SCM_TYP7S(x)==scm_tc7_string) \ |
90 | || (SCM_TYP7S(x) == scm_tc7_ssymbol)) | |
0f2d19dd JB |
91 | #define SCM_ROCHARS(x) ((SCM_TYP7(x) == scm_tc7_substring) \ |
92 | ? SCM_INUM (SCM_CADR (x)) + SCM_CHARS (SCM_CDDR (x)) \ | |
93 | : SCM_CHARS (x)) | |
94 | #define SCM_ROUCHARS(x) ((SCM_TYP7(x) == scm_tc7_substring) \ | |
c2cb2500 | 95 | ? SCM_INUM (SCM_CADR (x)) + SCM_UCHARS (SCM_CDDR (x))\ |
0f2d19dd JB |
96 | : SCM_UCHARS (x)) |
97 | #define SCM_ROLENGTH(x) SCM_LENGTH (x) | |
c2cb2500 | 98 | #define SCM_SUBSTRP(x) ((SCM_TYP7(x) == scm_tc7_substring)) |
0f2d19dd JB |
99 | #define SCM_SUBSTR_STR(x) (SCM_CDDR (x)) |
100 | #define SCM_SUBSTR_OFFSET(x) (SCM_CADR (x)) | |
101 | ||
89958ad0 JB |
102 | #define SCM_COERCE_SUBSTR(x) { if (SCM_SUBSTRP (x)) \ |
103 | x = scm_makfromstr (SCM_ROCHARS (x), \ | |
104 | SCM_ROLENGTH (x), 0); } | |
0f2d19dd JB |
105 | |
106 | \f | |
0f2d19dd | 107 | |
1cc91f1b JB |
108 | extern unsigned long scm_strhash SCM_P ((unsigned char *str, scm_sizet len, unsigned long n)); |
109 | extern SCM scm_sym2vcell SCM_P ((SCM sym, SCM thunk, SCM definep)); | |
110 | extern SCM scm_sym2ovcell_soft SCM_P ((SCM sym, SCM obarray)); | |
111 | extern SCM scm_sym2ovcell SCM_P ((SCM sym, SCM obarray)); | |
3eeba8d4 JB |
112 | extern SCM scm_intern_obarray_soft SCM_P ((const char *name, scm_sizet len, SCM obarray, int softness)); |
113 | extern SCM scm_intern_obarray SCM_P ((const char *name, scm_sizet len, SCM obarray)); | |
114 | extern SCM scm_intern SCM_P ((const char *name, scm_sizet len)); | |
115 | extern SCM scm_intern0 SCM_P ((const char * name)); | |
116 | extern SCM scm_sysintern SCM_P ((const char *name, SCM val)); | |
117 | extern SCM scm_sysintern0 SCM_P ((const char *name)); | |
118 | extern SCM scm_sysintern0_no_module_lookup SCM_P ((const char *name)); | |
119 | extern SCM scm_symbol_value0 SCM_P ((const char *name)); | |
1cc91f1b JB |
120 | extern SCM scm_symbol_p SCM_P ((SCM x)); |
121 | extern SCM scm_symbol_to_string SCM_P ((SCM s)); | |
122 | extern SCM scm_string_to_symbol SCM_P ((SCM s)); | |
123 | extern SCM scm_string_to_obarray_symbol SCM_P ((SCM o, SCM s, SCM softp)); | |
124 | extern SCM scm_intern_symbol SCM_P ((SCM o, SCM s)); | |
125 | extern SCM scm_unintern_symbol SCM_P ((SCM o, SCM s)); | |
126 | extern SCM scm_symbol_binding SCM_P ((SCM o, SCM s)); | |
127 | extern SCM scm_symbol_interned_p SCM_P ((SCM o, SCM s)); | |
128 | extern SCM scm_symbol_bound_p SCM_P ((SCM o, SCM s)); | |
129 | extern SCM scm_symbol_set_x SCM_P ((SCM o, SCM s, SCM v)); | |
130 | extern SCM scm_symbol_fref SCM_P ((SCM s)); | |
131 | extern SCM scm_symbol_pref SCM_P ((SCM s)); | |
132 | extern SCM scm_symbol_fset_x SCM_P ((SCM s, SCM val)); | |
133 | extern SCM scm_symbol_pset_x SCM_P ((SCM s, SCM val)); | |
134 | extern SCM scm_symbol_hash SCM_P ((SCM s)); | |
1ff4df7a MD |
135 | extern SCM scm_builtin_bindings SCM_P ((void)); |
136 | extern SCM scm_builtin_weak_bindings SCM_P ((void)); | |
137 | extern SCM scm_gensym SCM_P ((SCM name, SCM obarray)); | |
1cc91f1b | 138 | extern void scm_init_symbols SCM_P ((void)); |
0f2d19dd | 139 | |
9b8d3288 MV |
140 | extern int scm_can_use_top_level_lookup_closure_var; |
141 | ||
0f2d19dd | 142 | #endif /* SYMBOLSH */ |