1 /* Copyright (C) 1995,1996,2000,2001, 2004, 2005, 2006, 2008, 2009, 2011 Free Software Foundation, Inc.
3 * This library is free software; you can redistribute it and/or
4 * modify it under the terms of the GNU Lesser General Public License
5 * as published by the Free Software Foundation; either version 3 of
6 * the License, or (at your option) any later version.
8 * This library is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * Lesser General Public License for more details.
13 * You should have received a copy of the GNU Lesser General Public
14 * License along with this library; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
25 #include "libguile/_scm.h"
26 #include "libguile/validate.h"
28 #include "libguile/pairs.h"
38 * This compile-time test verifies the properties needed for the
39 * efficient test macro scm_is_null_or_nil defined in pairs.h,
40 * which is defined in terms of the SCM_MATCHES_BITS_IN_COMMON macro.
42 * See the comments preceeding the definitions of SCM_BOOL_F and
43 * SCM_MATCHES_BITS_IN_COMMON in tags.h for more information.
45 verify (SCM_BITS_DIFFER_IN_EXACTLY_ONE_BIT_POSITION \
46 (SCM_ELISP_NIL_BITS
, SCM_EOL_BITS
));
49 #if (SCM_DEBUG_PAIR_ACCESSES == 1)
51 #include "libguile/ports.h"
52 #include "libguile/strings.h"
54 void scm_error_pair_access (SCM non_pair
)
56 static unsigned int running
= 0;
57 SCM message
= scm_from_locale_string ("Non-pair accessed with SCM_C[AD]R: `~S'\n");
62 scm_simple_format (scm_current_error_port (),
63 message
, scm_list_1 (non_pair
));
70 SCM_DEFINE (scm_cons
, "cons", 2, 0, 0,
72 "Return a newly allocated pair whose car is @var{x} and whose\n"
73 "cdr is @var{y}. The pair is guaranteed to be different (in the\n"
74 "sense of @code{eq?}) from every previously existing object.")
75 #define FUNC_NAME s_scm_cons
77 return scm_cell (SCM_UNPACK (x
), SCM_UNPACK (y
));
83 scm_cons2 (SCM w
, SCM x
, SCM y
)
85 return scm_cons (w
, scm_cons (x
, y
));
89 SCM_DEFINE (scm_pair_p
, "pair?", 1, 0, 0,
91 "Return @code{#t} if @var{x} is a pair; otherwise return\n"
93 #define FUNC_NAME s_scm_pair_p
95 return scm_from_bool (scm_is_pair (x
));
99 SCM_DEFINE (scm_set_car_x
, "set-car!", 2, 0, 0,
100 (SCM pair
, SCM value
),
101 "Stores @var{value} in the car field of @var{pair}. The value returned\n"
102 "by @code{set-car!} is unspecified.")
103 #define FUNC_NAME s_scm_set_car_x
105 SCM_VALIDATE_CONS (1, pair
);
106 SCM_SETCAR (pair
, value
);
107 return SCM_UNSPECIFIED
;
112 SCM_DEFINE (scm_set_cdr_x
, "set-cdr!", 2, 0, 0,
113 (SCM pair
, SCM value
),
114 "Stores @var{value} in the cdr field of @var{pair}. The value returned\n"
115 "by @code{set-cdr!} is unspecified.")
116 #define FUNC_NAME s_scm_set_cdr_x
118 SCM_VALIDATE_CONS (1, pair
);
119 SCM_SETCDR (pair
, value
);
120 return SCM_UNSPECIFIED
;
126 /* Every cxr-pattern is made up of pairs of bits, starting with the two least
127 * significant bits. If in a pair of bits the least significant of the two
128 * bits is 0, this means CDR, otherwise CAR. The most significant bits of the
129 * two bits is only needed to indicate when cxr-ing is ready. This is the
130 * case, when all remaining pairs of bits equal 00. */
132 /* The compiler should unroll this. */
133 #define CHASE_PAIRS(tree, FUNC_NAME, pattern) \
134 scm_t_uint32 pattern_var = pattern; \
137 if (!scm_is_pair (tree)) \
138 scm_wrong_type_arg_msg (FUNC_NAME, 0, tree, "pair"); \
139 tree = (pattern_var & 1) ? SCM_CAR (tree) : SCM_CDR (tree); \
142 while (pattern_var); \
146 SCM_DEFINE (scm_cdr
, "cdr", 1, 0, 0, (SCM x
), "")
148 CHASE_PAIRS (x
, "cdr", 0x02); /* 00000010 */
150 SCM_DEFINE (scm_car
, "car", 1, 0, 0, (SCM x
), "")
152 CHASE_PAIRS (x
, "car", 0x03); /* 00000011 */
154 SCM_DEFINE (scm_cddr
, "cddr", 1, 0, 0, (SCM x
), "")
156 CHASE_PAIRS (x
, "cddr", 0x0a); /* 00001010 */
158 SCM_DEFINE (scm_cdar
, "cdar", 1, 0, 0, (SCM x
), "")
160 CHASE_PAIRS (x
, "cdar", 0x0b); /* 00001011 */
162 SCM_DEFINE (scm_cadr
, "cadr", 1, 0, 0, (SCM x
), "")
164 CHASE_PAIRS (x
, "cadr", 0x0e); /* 00001110 */
166 SCM_DEFINE (scm_caar
, "caar", 1, 0, 0, (SCM x
), "")
168 CHASE_PAIRS (x
, "caar", 0x0f); /* 00001111 */
170 SCM_DEFINE (scm_cdddr
, "cdddr", 1, 0, 0, (SCM x
), "")
172 CHASE_PAIRS (x
, "cdddr", 0x2a); /* 00101010 */
174 SCM_DEFINE (scm_cddar
, "cddar", 1, 0, 0, (SCM x
), "")
176 CHASE_PAIRS (x
, "cddar", 0x2b); /* 00101011 */
178 SCM_DEFINE (scm_cdadr
, "cdadr", 1, 0, 0, (SCM x
), "")
180 CHASE_PAIRS (x
, "cdadr", 0x2e); /* 00101110 */
182 SCM_DEFINE (scm_cdaar
, "cdaar", 1, 0, 0, (SCM x
), "")
184 CHASE_PAIRS (x
, "cdaar", 0x2f); /* 00101111 */
186 SCM_DEFINE (scm_caddr
, "caddr", 1, 0, 0, (SCM x
), "")
188 CHASE_PAIRS (x
, "caddr", 0x3a); /* 00111010 */
190 SCM_DEFINE (scm_cadar
, "cadar", 1, 0, 0, (SCM x
), "")
192 CHASE_PAIRS (x
, "cadar", 0x3b); /* 00111011 */
194 SCM_DEFINE (scm_caadr
, "caadr", 1, 0, 0, (SCM x
), "")
196 CHASE_PAIRS (x
, "caadr", 0x3e); /* 00111110 */
198 SCM_DEFINE (scm_caaar
, "caaar", 1, 0, 0, (SCM x
), "")
200 CHASE_PAIRS (x
, "caaar", 0x3f); /* 00111111 */
202 SCM_DEFINE (scm_cddddr
, "cddddr", 1, 0, 0, (SCM x
), "")
204 CHASE_PAIRS (x
, "cddddr", 0xaa); /* 10101010 */
206 SCM_DEFINE (scm_cdddar
, "cdddar", 1, 0, 0, (SCM x
), "")
208 CHASE_PAIRS (x
, "cdddar", 0xab); /* 10101011 */
210 SCM_DEFINE (scm_cddadr
, "cddadr", 1, 0, 0, (SCM x
), "")
212 CHASE_PAIRS (x
, "cddadr", 0xae); /* 10101110 */
214 SCM_DEFINE (scm_cddaar
, "cddaar", 1, 0, 0, (SCM x
), "")
216 CHASE_PAIRS (x
, "cddaar", 0xaf); /* 10101111 */
218 SCM_DEFINE (scm_cdaddr
, "cdaddr", 1, 0, 0, (SCM x
), "")
220 CHASE_PAIRS (x
, "cdaddr", 0xba); /* 10111010 */
222 SCM_DEFINE (scm_cdadar
, "cdadar", 1, 0, 0, (SCM x
), "")
224 CHASE_PAIRS (x
, "cdadar", 0xbb); /* 10111011 */
226 SCM_DEFINE (scm_cdaadr
, "cdaadr", 1, 0, 0, (SCM x
), "")
228 CHASE_PAIRS (x
, "cdaadr", 0xbe); /* 10111110 */
230 SCM_DEFINE (scm_cdaaar
, "cdaaar", 1, 0, 0, (SCM x
), "")
232 CHASE_PAIRS (x
, "cdaaar", 0xbf); /* 10111111 */
234 SCM_DEFINE (scm_cadddr
, "cadddr", 1, 0, 0, (SCM x
), "")
236 CHASE_PAIRS (x
, "cadddr", 0xea); /* 11101010 */
238 SCM_DEFINE (scm_caddar
, "caddar", 1, 0, 0, (SCM x
), "")
240 CHASE_PAIRS (x
, "caddar", 0xeb); /* 11101011 */
242 SCM_DEFINE (scm_cadadr
, "cadadr", 1, 0, 0, (SCM x
), "")
244 CHASE_PAIRS (x
, "cadadr", 0xee); /* 11101110 */
246 SCM_DEFINE (scm_cadaar
, "cadaar", 1, 0, 0, (SCM x
), "")
248 CHASE_PAIRS (x
, "cadaar", 0xef); /* 11101111 */
250 SCM_DEFINE (scm_caaddr
, "caaddr", 1, 0, 0, (SCM x
), "")
252 CHASE_PAIRS (x
, "caaddr", 0xfa); /* 11111010 */
254 SCM_DEFINE (scm_caadar
, "caadar", 1, 0, 0, (SCM x
), "")
256 CHASE_PAIRS (x
, "caadar", 0xfb); /* 11111011 */
258 SCM_DEFINE (scm_caaadr
, "caaadr", 1, 0, 0, (SCM x
), "")
260 CHASE_PAIRS (x
, "caaadr", 0xfe); /* 11111110 */
262 SCM_DEFINE (scm_caaaar
, "caaaar", 1, 0, 0, (SCM x
), "")
264 CHASE_PAIRS (x
, "caaaar", 0xff); /* 11111111 */
272 #include "libguile/pairs.x"