/* Copyright 1995-1996,2000-2001,2004-2006,2008-2013,2017-2019
Free Software Foundation, Inc.
This file is part of Guile.
Guile is free software: you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Guile is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public
License along with Guile. If not, see
. */
#ifdef HAVE_CONFIG_H
# include
#endif
#include
#include "boolean.h"
#include "gsubr.h"
#include "pairs.h"
/* {Pairs}
*/
/*
* This compile-time test verifies the properties needed for the
* efficient test macro scm_is_null_or_nil defined in pairs.h,
* which is defined in terms of the SCM_MATCHES_BITS_IN_COMMON macro.
*
* See the comments preceeding the definitions of SCM_BOOL_F and
* SCM_MATCHES_BITS_IN_COMMON in scm.h for more information.
*/
verify (SCM_BITS_DIFFER_IN_EXACTLY_ONE_BIT_POSITION \
(SCM_ELISP_NIL_BITS, SCM_EOL_BITS));
#if (SCM_DEBUG_PAIR_ACCESSES == 1)
#include "ports.h"
#include "strings.h"
void scm_error_pair_access (SCM non_pair)
{
static unsigned int running = 0;
SCM message = scm_from_utf8_string ("Non-pair accessed with SCM_C[AD]R: `~S'\n");
if (!running)
{
running = 1;
scm_simple_format (scm_current_error_port (),
message, scm_list_1 (non_pair));
abort ();
}
}
#endif
SCM
scm_cons2 (SCM w, SCM x, SCM y)
{
return scm_cons (w, scm_cons (x, y));
}
SCM_DEFINE (scm_pair_p, "pair?", 1, 0, 0,
(SCM x),
"Return @code{#t} if @var{x} is a pair; otherwise return\n"
"@code{#f}.")
#define FUNC_NAME s_scm_pair_p
{
return scm_from_bool (scm_is_pair (x));
}
#undef FUNC_NAME
SCM_DEFINE (scm_set_car_x, "set-car!", 2, 0, 0,
(SCM pair, SCM value),
"Stores @var{value} in the car field of @var{pair}. The value returned\n"
"by @code{set-car!} is unspecified.")
#define FUNC_NAME s_scm_set_car_x
{
SCM_VALIDATE_MUTABLE_PAIR (1, pair);
SCM_SETCAR (pair, value);
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
SCM_DEFINE (scm_set_cdr_x, "set-cdr!", 2, 0, 0,
(SCM pair, SCM value),
"Stores @var{value} in the cdr field of @var{pair}. The value returned\n"
"by @code{set-cdr!} is unspecified.")
#define FUNC_NAME s_scm_set_cdr_x
{
SCM_VALIDATE_MUTABLE_PAIR (1, pair);
SCM_SETCDR (pair, value);
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
/* Every cxr-pattern is made up of pairs of bits, starting with the two least
* significant bits. If in a pair of bits the least significant of the two
* bits is 0, this means CDR, otherwise CAR. The most significant bits of the
* two bits is only needed to indicate when cxr-ing is ready. This is the
* case, when all remaining pairs of bits equal 00. */
/* The compiler should unroll this. */
#define CHASE_PAIRS(tree, FUNC_NAME, pattern) \
uint32_t pattern_var = pattern; \
do \
{ \
if (!scm_is_pair (tree)) \
scm_wrong_type_arg_msg (FUNC_NAME, 0, tree, "pair"); \
tree = (pattern_var & 1) ? SCM_CAR (tree) : SCM_CDR (tree); \
pattern_var >>= 2; \
} \
while (pattern_var); \
return tree
SCM_DEFINE (scm_cddr, "cddr", 1, 0, 0, (SCM x), "")
#define FUNC_NAME s_scm_cddr
{
CHASE_PAIRS (x, "cddr", 0x0a); /* 00001010 */
}
#undef FUNC_NAME
SCM_DEFINE (scm_cdar, "cdar", 1, 0, 0, (SCM x), "")
#define FUNC_NAME s_scm_cdar
{
CHASE_PAIRS (x, "cdar", 0x0b); /* 00001011 */
}
#undef FUNC_NAME
SCM_DEFINE (scm_cadr, "cadr", 1, 0, 0, (SCM x), "")
#define FUNC_NAME s_scm_cadr
{
CHASE_PAIRS (x, "cadr", 0x0e); /* 00001110 */
}
#undef FUNC_NAME
SCM_DEFINE (scm_caar, "caar", 1, 0, 0, (SCM x), "")
#define FUNC_NAME s_scm_caar
{
CHASE_PAIRS (x, "caar", 0x0f); /* 00001111 */
}
#undef FUNC_NAME
SCM_DEFINE (scm_cdddr, "cdddr", 1, 0, 0, (SCM x), "")
#define FUNC_NAME s_scm_cdddr
{
CHASE_PAIRS (x, "cdddr", 0x2a); /* 00101010 */
}
#undef FUNC_NAME
SCM_DEFINE (scm_cddar, "cddar", 1, 0, 0, (SCM x), "")
#define FUNC_NAME s_scm_cddar
{
CHASE_PAIRS (x, "cddar", 0x2b); /* 00101011 */
}
#undef FUNC_NAME
SCM_DEFINE (scm_cdadr, "cdadr", 1, 0, 0, (SCM x), "")
#define FUNC_NAME s_scm_cdadr
{
CHASE_PAIRS (x, "cdadr", 0x2e); /* 00101110 */
}
#undef FUNC_NAME
SCM_DEFINE (scm_cdaar, "cdaar", 1, 0, 0, (SCM x), "")
#define FUNC_NAME s_scm_cdaar
{
CHASE_PAIRS (x, "cdaar", 0x2f); /* 00101111 */
}
#undef FUNC_NAME
SCM_DEFINE (scm_caddr, "caddr", 1, 0, 0, (SCM x), "")
#define FUNC_NAME s_scm_caddr
{
CHASE_PAIRS (x, "caddr", 0x3a); /* 00111010 */
}
#undef FUNC_NAME
SCM_DEFINE (scm_cadar, "cadar", 1, 0, 0, (SCM x), "")
#define FUNC_NAME s_scm_cadar
{
CHASE_PAIRS (x, "cadar", 0x3b); /* 00111011 */
}
#undef FUNC_NAME
SCM_DEFINE (scm_caadr, "caadr", 1, 0, 0, (SCM x), "")
#define FUNC_NAME s_scm_caadr
{
CHASE_PAIRS (x, "caadr", 0x3e); /* 00111110 */
}
#undef FUNC_NAME
SCM_DEFINE (scm_caaar, "caaar", 1, 0, 0, (SCM x), "")
#define FUNC_NAME s_scm_caaar
{
CHASE_PAIRS (x, "caaar", 0x3f); /* 00111111 */
}
#undef FUNC_NAME
SCM_DEFINE (scm_cddddr, "cddddr", 1, 0, 0, (SCM x), "")
#define FUNC_NAME s_scm_cddddr
{
CHASE_PAIRS (x, "cddddr", 0xaa); /* 10101010 */
}
#undef FUNC_NAME
SCM_DEFINE (scm_cdddar, "cdddar", 1, 0, 0, (SCM x), "")
#define FUNC_NAME s_scm_cdddar
{
CHASE_PAIRS (x, "cdddar", 0xab); /* 10101011 */
}
#undef FUNC_NAME
SCM_DEFINE (scm_cddadr, "cddadr", 1, 0, 0, (SCM x), "")
#define FUNC_NAME s_scm_cddadr
{
CHASE_PAIRS (x, "cddadr", 0xae); /* 10101110 */
}
#undef FUNC_NAME
SCM_DEFINE (scm_cddaar, "cddaar", 1, 0, 0, (SCM x), "")
#define FUNC_NAME s_scm_cddaar
{
CHASE_PAIRS (x, "cddaar", 0xaf); /* 10101111 */
}
#undef FUNC_NAME
SCM_DEFINE (scm_cdaddr, "cdaddr", 1, 0, 0, (SCM x), "")
#define FUNC_NAME s_scm_cdaddr
{
CHASE_PAIRS (x, "cdaddr", 0xba); /* 10111010 */
}
#undef FUNC_NAME
SCM_DEFINE (scm_cdadar, "cdadar", 1, 0, 0, (SCM x), "")
#define FUNC_NAME s_scm_cdadar
{
CHASE_PAIRS (x, "cdadar", 0xbb); /* 10111011 */
}
#undef FUNC_NAME
SCM_DEFINE (scm_cdaadr, "cdaadr", 1, 0, 0, (SCM x), "")
#define FUNC_NAME s_scm_cdaadr
{
CHASE_PAIRS (x, "cdaadr", 0xbe); /* 10111110 */
}
#undef FUNC_NAME
SCM_DEFINE (scm_cdaaar, "cdaaar", 1, 0, 0, (SCM x), "")
#define FUNC_NAME s_scm_cdaaar
{
CHASE_PAIRS (x, "cdaaar", 0xbf); /* 10111111 */
}
#undef FUNC_NAME
SCM_DEFINE (scm_cadddr, "cadddr", 1, 0, 0, (SCM x), "")
#define FUNC_NAME s_scm_cadddr
{
CHASE_PAIRS (x, "cadddr", 0xea); /* 11101010 */
}
#undef FUNC_NAME
SCM_DEFINE (scm_caddar, "caddar", 1, 0, 0, (SCM x), "")
#define FUNC_NAME s_scm_caddar
{
CHASE_PAIRS (x, "caddar", 0xeb); /* 11101011 */
}
#undef FUNC_NAME
SCM_DEFINE (scm_cadadr, "cadadr", 1, 0, 0, (SCM x), "")
#define FUNC_NAME s_scm_cadadr
{
CHASE_PAIRS (x, "cadadr", 0xee); /* 11101110 */
}
#undef FUNC_NAME
SCM_DEFINE (scm_cadaar, "cadaar", 1, 0, 0, (SCM x), "")
#define FUNC_NAME s_scm_cadaar
{
CHASE_PAIRS (x, "cadaar", 0xef); /* 11101111 */
}
#undef FUNC_NAME
SCM_DEFINE (scm_caaddr, "caaddr", 1, 0, 0, (SCM x), "")
#define FUNC_NAME s_scm_caaddr
{
CHASE_PAIRS (x, "caaddr", 0xfa); /* 11111010 */
}
#undef FUNC_NAME
SCM_DEFINE (scm_caadar, "caadar", 1, 0, 0, (SCM x), "")
#define FUNC_NAME s_scm_caadar
{
CHASE_PAIRS (x, "caadar", 0xfb); /* 11111011 */
}
#undef FUNC_NAME
SCM_DEFINE (scm_caaadr, "caaadr", 1, 0, 0, (SCM x), "")
#define FUNC_NAME s_scm_caaadr
{
CHASE_PAIRS (x, "caaadr", 0xfe); /* 11111110 */
}
#undef FUNC_NAME
SCM_DEFINE (scm_caaaar, "caaaar", 1, 0, 0, (SCM x), "")
#define FUNC_NAME s_scm_caaaar
{
CHASE_PAIRS (x, "caaaar", 0xff); /* 11111111 */
}
#undef FUNC_NAME
void
scm_init_pairs ()
{
#include "pairs.x"
scm_c_define_gsubr ("cons", 2, 0, 0, scm_cons);
scm_c_define_gsubr ("car", 1, 0, 0, scm_car);
scm_c_define_gsubr ("cdr", 1, 0, 0, scm_cdr);
}