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guile/libguile/symbols.h
Jim Blandy 1cc91f1b29 * __scm.h, alist.c, alist.h, append.c, append.h, appinit.c, 
arbiters.c, arbiters.h, async.c, async.h, boolean.c, boolean.h,
chars.c, chars.h, continuations.c, continuations.h, debug.c,
debug.h, dynwind.c, dynwind.h, eq.c, eq.h, error.c, eval.c,
eval.h, extchrs.c, extchrs.h, fdsocket.c, fdsocket.h, filesys.c,
filesys.h, fports.c, fports.h, gc.c, gdb_interface.h, gdbint.c,
gdbint.h, genio.c, genio.h, gscm.c, gscm.h, gsubr.c, gsubr.h,
hash.c, hash.h, hashtab.c, hashtab.h, init.c, ioext.c, ioext.h,
kw.c, kw.h, libguile.h, mallocs.c, mallocs.h, markers.c,
markers.h, mbstrings.c, mbstrings.h, numbers.c, numbers.h,
objprop.c, objprop.h, options.c, options.h, pairs.c, pairs.h,
ports.c, ports.h, posix.c, posix.h, print.c, print.h, procprop.c,
procprop.h, procs.c, procs.h, ramap.c, ramap.h, read.c, read.h,
root.c, scmsigs.c, scmsigs.h, sequences.c, sequences.h, simpos.c,
simpos.h, smob.c, socket.c, socket.h, srcprop.c, srcprop.h,
stackchk.c, stackchk.h, stime.c, stime.h, strings.c, strings.h,
strop.c, strop.h, strorder.c, strorder.h, strports.c, strports.h,
struct.c, struct.h, symbols.c, symbols.h, tag.c, tag.h, unif.c,
unif.h, variable.c, variable.h, vectors.c, vectors.h, version.c,
version.h, vports.c, vports.h, weaks.c, weaks.h: Use SCM_P to
declare functions with prototypes.  (Patch thanks to Marius
Vollmer.)
1996-10-14 01:33:50 +00:00

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/* classes: h_files */
#ifndef SYMBOLSH
#define SYMBOLSH
/* Copyright (C) 1995,1996 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, 675 Mass Ave, Cambridge, MA 02139, 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))
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_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 void scm_init_symbols SCM_P ((void));
#endif /* SYMBOLSH */
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