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guile/libguile/symbols.h
Jim Blandy 3eeba8d4f5 * chars.c (scm_lowers, scm_uppers, scm_charnames, scm_charnums), 
eval.c (s_expression, s_test, s_body, s_bindings, s_variable,
s_clauses, s_formals): Variables now const.
* eval.c (promsmob): Now const.
* macros.c (macrosmob): Now const.
* smob.c (scm_newsmob): Smobfuns argument now points to const.
(freecell, flob, bigob): Now const.
* dynl.c (scm_make_argv_from_stringlist, scm_coerce_rostring),
error.c (scm_error, scm_syserror, scm_syserror_msg,
scm_num_overflow, scm_out_of_range, scm_wrong_type_arg,
scm_memory_error, scm_misc_error, scm_wta), macros.c
(scm_make_synt), feature.c (scm_add_feature), filesys.c
(scm_input_waiting_p), gc.c (scm_gc_start, scm_igc,
scm_must_malloc, scm_must_realloc), gsubr.c (scm_make_gsubr),
numbers.c (scm_num2dbl, scm_two_doubles, scm_num2long,
scm_num2long_long, scm_num2ulong),
options.c (scm_options), posix.c (scm_convert_exec_args,
environ_list_to_c), procs.c (scm_make_subr_opt, scm_make_subr),
ramap.c (scm_ramapc), read.c (scm_flush_ws), socket.c
(scm_sock_fd_to_port, scm_fill_sockaddr, scm_addr_vector), stime.c
(setzone, restorezone, bdtime2c), strop.c (scm_i_index),
strports.c (scm_mkstrport), symbols.c (scm_intern_obarray_soft,
scm_intern_obarray, scm_intern, scm_intern0,
scm_sysintern0_no_module_lookup, scm_sysintern, scm_sysintern0,
scm_symbol_value0), unif.c (scm_aind, scm_shap2ra): Argument
indicating calling subr, error message text, reason for error,
symbol name or feature name are now pointer to const.
* snarf.h (SCM_PROC, SCM_PROC1): String variables are now const.
* procs.c (scm_init_iprocs): iproc argument now points to const.
* pairs.c (cxrs): Now const.
* chars.h, error.h, feature.h, filesys.h, gc.h, gsubr.h, macros.h,
numbers.h, options.h, procs.h, ramap.h, read.h, smob.h,
strports.h, symbols.h, unif.h: Update variable declarations and
function prototypes for above changes.
* dynl.c, dynl-dld.c, dynl-dl.c, dynl-shl.c (sysdep_dynl_link,
sysdep_dynl_unlink, sysdep_dynl_func): Arguments FNAME, SUBR, and
SYMB now point to const.
1999-02-06 12:31:04 +00:00

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/* classes: h_files */
#ifndef SYMBOLSH
#define SYMBOLSH
/* Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*
* As a special exception, the Free Software Foundation gives permission
* for additional uses of the text contained in its release of GUILE.
*
* The exception is that, if you link the GUILE library with other files
* to produce an executable, this does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* Your use of that executable is in no way restricted on account of
* linking the GUILE library code into it.
*
* This exception does not however invalidate any other reasons why
* the executable file might be covered by the GNU General Public License.
*
* This exception applies only to the code released by the
* Free Software Foundation under the name GUILE. If you copy
* code from other Free Software Foundation releases into a copy of
* GUILE, as the General Public License permits, the exception does
* not apply to the code that you add in this way. To avoid misleading
* anyone as to the status of such modified files, you must delete
* this exception notice from them.
*
* If you write modifications of your own for GUILE, it is your choice
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice. */
#include "libguile/__scm.h"
extern int scm_symhash_dim;
/* SCM_LENGTH(SYM) is the length of SYM's name in characters, and
SCM_CHARS(SYM) is the address of the first character of SYM's name.
Beyond that, there are two kinds of symbols: ssymbols and msymbols,
distinguished by the 'S' bit in the type.
Ssymbols are just uniquified strings. They have a length, chars,
and that's it. They use the scm_tc7_ssymbol tag (S bit clear).
Msymbols are symbols with extra slots. These slots hold a property
list and a function value (for Emacs Lisp compatibility), and a hash
code. They use the scm_tc7_msymbol tag.
We'd like SCM_CHARS to work on msymbols just as it does on
ssymbols, so we'll have it point to the symbol's name as usual, and
store a pointer to the slots just before the name in memory. Thus,
you have to do some casting and pointer arithmetic to find the
slots; see the SCM_SLOTS macro.
In practice, the slots always live just before the pointer to them.
So why not ditch the pointer, and use negative indices to refer to
the slots? That's a good question; ask the author. I think it was
the cognac. */
#define SCM_SYMBOLP(x) (SCM_TYP7S(x)==scm_tc7_ssymbol)
#define SCM_LENGTH(x) (((unsigned long)SCM_CAR(x))>>8)
#define SCM_LENGTH_MAX (0xffffffL)
#define SCM_SETLENGTH(x, v, t) SCM_SETCAR((x), ((v)<<8)+(t))
#define SCM_SETCHARS SCM_SETCDR
#define SCM_CHARS(x) ((char *)(SCM_CDR(x)))
#define SCM_UCHARS(x) ((unsigned char *)(SCM_CDR(x)))
#define SCM_SLOTS(x) ((SCM *) (* ((SCM *)SCM_CHARS(x) - 1)))
#define SCM_SYMBOL_SLOTS 4
#define SCM_SYMBOL_FUNC(X) (SCM_SLOTS(X)[0])
#define SCM_SYMBOL_PROPS(X) (SCM_SLOTS(X)[1])
#define SCM_SYMBOL_HASH(X) (*(unsigned long*)(&SCM_SLOTS(X)[2]))
#define SCM_ROSTRINGP(x) ((SCM_TYP7S(x)==scm_tc7_string) \
|| (SCM_TYP7S(x) == scm_tc7_ssymbol))
#define SCM_ROCHARS(x) ((SCM_TYP7(x) == scm_tc7_substring) \
? SCM_INUM (SCM_CADR (x)) + SCM_CHARS (SCM_CDDR (x)) \
: SCM_CHARS (x))
#define SCM_ROUCHARS(x) ((SCM_TYP7(x) == scm_tc7_substring) \
? SCM_INUM (SCM_CADR (x)) + SCM_UCHARS (SCM_CDDR (x))\
: SCM_UCHARS (x))
#define SCM_ROLENGTH(x) SCM_LENGTH (x)
#define SCM_SUBSTRP(x) ((SCM_TYP7(x) == scm_tc7_substring))
#define SCM_SUBSTR_STR(x) (SCM_CDDR (x))
#define SCM_SUBSTR_OFFSET(x) (SCM_CADR (x))
#define SCM_COERCE_SUBSTR(x) { if (SCM_SUBSTRP (x)) \
x = scm_makfromstr (SCM_ROCHARS (x), \
SCM_ROLENGTH (x), 0); }
extern unsigned long scm_strhash SCM_P ((unsigned char *str, scm_sizet len, unsigned long n));
extern SCM scm_sym2vcell SCM_P ((SCM sym, SCM thunk, SCM definep));
extern SCM scm_sym2ovcell_soft SCM_P ((SCM sym, SCM obarray));
extern SCM scm_sym2ovcell SCM_P ((SCM sym, SCM obarray));
extern SCM scm_intern_obarray_soft SCM_P ((const char *name, scm_sizet len, SCM obarray, int softness));
extern SCM scm_intern_obarray SCM_P ((const char *name, scm_sizet len, SCM obarray));
extern SCM scm_intern SCM_P ((const char *name, scm_sizet len));
extern SCM scm_intern0 SCM_P ((const char * name));
extern SCM scm_sysintern SCM_P ((const char *name, SCM val));
extern SCM scm_sysintern0 SCM_P ((const char *name));
extern SCM scm_sysintern0_no_module_lookup SCM_P ((const char *name));
extern SCM scm_symbol_value0 SCM_P ((const char *name));
extern SCM scm_symbol_p SCM_P ((SCM x));
extern SCM scm_symbol_to_string SCM_P ((SCM s));
extern SCM scm_string_to_symbol SCM_P ((SCM s));
extern SCM scm_string_to_obarray_symbol SCM_P ((SCM o, SCM s, SCM softp));
extern SCM scm_intern_symbol SCM_P ((SCM o, SCM s));
extern SCM scm_unintern_symbol SCM_P ((SCM o, SCM s));
extern SCM scm_symbol_binding SCM_P ((SCM o, SCM s));
extern SCM scm_symbol_interned_p SCM_P ((SCM o, SCM s));
extern SCM scm_symbol_bound_p SCM_P ((SCM o, SCM s));
extern SCM scm_symbol_set_x SCM_P ((SCM o, SCM s, SCM v));
extern SCM scm_symbol_fref SCM_P ((SCM s));
extern SCM scm_symbol_pref SCM_P ((SCM s));
extern SCM scm_symbol_fset_x SCM_P ((SCM s, SCM val));
extern SCM scm_symbol_pset_x SCM_P ((SCM s, SCM val));
extern SCM scm_symbol_hash SCM_P ((SCM s));
extern SCM scm_builtin_bindings SCM_P ((void));
extern SCM scm_builtin_weak_bindings SCM_P ((void));
extern SCM scm_gensym SCM_P ((SCM name, SCM obarray));
extern void scm_init_symbols SCM_P ((void));
extern int scm_can_use_top_level_lookup_closure_var;
#endif /* SYMBOLSH */
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