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/* classes: h_files */
#ifndef SYMBOLSH
#define SYMBOLSH
/* Copyright (C) 1995,1996,1997 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), a hash
code, and a flag to indicate whether their name contains multibyte
characters. 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 5
#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_SYMBOL_MULTI_BYTE_STRINGP(X) (*(unsigned long*)(&SCM_SLOTS(X)[3]))
#define SCM_ROSTRINGP(x) ((SCM_TYP7SD(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_TYP7S(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 ((char *name, scm_sizet len, SCM obarray, int softness));
extern SCM scm_intern_obarray SCM_P ((char *name, scm_sizet len, SCM obarray));
extern SCM scm_intern SCM_P ((char *name, scm_sizet len));
extern SCM scm_intern0 SCM_P ((char * name));
extern SCM scm_sysintern SCM_P ((char *name, SCM val));
extern SCM scm_sysintern0 SCM_P ((char *name));
extern SCM scm_symbol_value0 SCM_P ((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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