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9de33deb2e
associated with subrs. (SCM_SUBRNUM, SCM_SUBR_ENTRY, SCM_SUBR_GENERIC, SCM_SUBR_PROPS, SCM_SUBR_DOC): New macros. (scm_subr_table): New variable. (scm_mark_subr_table): New function. * init.c (scm_boot_guile_1): Call scm_init_subr_table. * gc.c (scm_gc_mark): Don't mark subr names here. (scm_igc): Call scm_mark_subr_table. * snarf.h (SCM_GPROC, SCM_GPROC1): New macros. * procs.c, procs.h (scm_subr_p): New function (used internally). * gsubr.c, gsubr.h (scm_make_gsubr_with_generic): New function. * objects.c, objects.h (scm_primitive_generic): New class. * objects.h (SCM_CMETHOD_CODE, SCM_CMETHOD_ENV): New macros. * print.c (scm_iprin1): Print primitive-generics. * __scm.h (SCM_WTA_DISPATCH_1, SCM_GASSERT1, SCM_WTA_DISPATCH_2, SCM_GASSERT2): New macros. * eval.c (SCM_CEVAL, SCM_APPLY): Replace scm_wta --> SCM_WTA_DISPATCH_1 for scm_cxr's (unary floating point primitives). NOTE: This means that it is now *required* to use SCM_GPROC1 when creating float scm_cxr's (float scm_cxr's is an obscured representation that will be removed in the future anyway, so backward compatibility is no problem here). * numbers.c: Converted most numeric primitives (all but bit comparison operations and bit operations) to dispatch on generic if args don't match. * eval.c, eval.h (scm_eval_body): New function. * objects.c (scm_call_generic_0, scm_call_generic_1, scm_call_generic_2, scm_call_generic_3, scm_apply_generic): New functions. * eval.c (SCM_CEVAL): Apply the cmethod directly after having called scm_memoize_method instead of doing a second lookup. * objects.h (scm_memoize_method): Now returns the memoized cmethod. * procs.c (scm_make_subr_opt): Use scm_sysintern0 instead of scm_sysintern so that the binding connected with the subr name isn't cleared when we give set = 0.
197 lines
7 KiB
C
197 lines
7 KiB
C
/* classes: h_files */
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#ifndef PROCSH
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#define PROCSH
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/* Copyright (C) 1995,1996,1998 Free Software Foundation, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA
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*
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* As a special exception, the Free Software Foundation gives permission
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* for additional uses of the text contained in its release of GUILE.
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*
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* The exception is that, if you link the GUILE library with other files
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* to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the GUILE library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by the
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* Free Software Foundation under the name GUILE. If you copy
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* code from other Free Software Foundation releases into a copy of
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* GUILE, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from them.
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*
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* If you write modifications of your own for GUILE, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice. */
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#include "libguile/__scm.h"
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/* Subrs
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*/
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typedef struct scm_subr
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{
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long sname;
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SCM (*cproc) ();
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} scm_subr;
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typedef struct scm_iproc
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{
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char *scm_string;
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SCM (*cproc) ();
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} scm_iproc;
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typedef struct scm_dsubr
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{
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long sname;
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double (*dproc) ();
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} scm_dsubr;
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typedef struct
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{
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SCM handle; /* link back to procedure object */
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SCM name;
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SCM *generic; /* 0 if no generic support
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* *generic == 0 until first method
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*/
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SCM properties; /* procedure properties */
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SCM documentation;
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} scm_subr_entry;
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#define SCM_SUBRNUM(subr) (SCM_CAR (subr) >> 8)
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#define SCM_SET_SUBRNUM(subr, num) \
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SCM_SETCAR (subr, (num >> 8) + SCM_TYP7 (subr))
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#define SCM_SUBR_ENTRY(x) (scm_subr_table[SCM_SUBRNUM (x)])
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#define SCM_SNAME(x) (SCM_SUBR_ENTRY (x).name)
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#define SCM_SUBRF(x) (((scm_subr *)(SCM2PTR(x)))->cproc)
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#define SCM_DSUBRF(x) (((scm_dsubr *)(SCM2PTR(x)))->dproc)
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#define SCM_CCLO_SUBR(x) (SCM_VELTS(x)[0])
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#define SCM_SUBR_GENERIC(x) (SCM_SUBR_ENTRY (x).generic)
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#define SCM_SUBR_PROPS(x) (SCM_SUBR_ENTRY (x).properties)
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#define SCM_SUBR_DOC(x) (SCM_SUBR_ENTRY (x).documentation)
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/* Closures
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*/
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#define SCM_CLOSUREP(x) (SCM_TYP3(x)==scm_tc3_closure)
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#define SCM_CLOSCAR(x) (SCM_CAR(x)-scm_tc3_closure)
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#define SCM_CODE(x) SCM_CAR(SCM_CLOSCAR (x))
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#define SCM_PROCPROPS(x) SCM_CDR(SCM_CLOSCAR (x))
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#define SCM_SETPROCPROPS(x, p) SCM_SETCDR(SCM_CLOSCAR (x), p)
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#define SCM_SETCODE(x, e) (SCM_SETCAR (x, scm_cons ((e), SCM_EOL) + scm_tc3_closure))
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#define SCM_ENV(x) SCM_CDR(x)
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#define SCM_SETENV(x, e) SCM_SETCDR (x, e)
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#define SCM_TOP_LEVEL(SCM_ENV) (SCM_NULLP(SCM_ENV) || (SCM_BOOL_T == scm_procedure_p (SCM_CAR (SCM_ENV))))
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/* Procedure-with-setter
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Four representations for procedure-with-setters were
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considered before selecting this one:
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1. A closure where the CODE and ENV slots are used to represent
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the getter and a new SETTER slot is used for the setter. The
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original getter is stored as a `getter' procedure property. For
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closure getters, the CODE and ENV slots contains a copy of the
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getter's CODE and ENV slots. For subr getters, the CODE contains
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a call to the subr.
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2. A compiled closure with a call to the getter in the cclo
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procedure. The getter and setter are stored in slots 1 and 2.
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3. An entity (i.e. a struct with an associated procedure) with a
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call to the getter in the entity procedure and the setter stored
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in slot 0. The original getter is stored in slot 1.
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4. A new primitive procedure type supported in the evaluator. The
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getter and setter are stored in a GETTER and SETTER slot. A call
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to this procedure type results in a retrieval of the getter and a
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jump back to the correct eval dispatcher.
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Representation 4 was selected because of efficiency and
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simplicity.
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Rep 1 has the advantage that there is zero penalty for closure
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getters, but primitive getters will get considerable overhead
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because the procedure-with-getter will be a closure which calls
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the getter.
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Rep 3 has the advantage that a GOOPS accessor can be a subclass of
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<procedure-with-setter>, but together with rep 2 it suffers from a
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three level dispatch for non-GOOPS getters:
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cclo/struct --> dispatch proc --> getter
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This is because the dispatch procedure must take an extra initial
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argument (cclo for rep 2, struct for rep 3).
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Rep 4 has the single disadvantage that it uses up one tc7 type
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code, but the plan for uniform vectors will very likely free tc7
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codes, so this is probably no big problem. Also note that the
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GETTER and SETTER slots can live directly on the heap, using the
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new four-word cells. */
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#define SCM_PROCEDURE_WITH_SETTER_P(obj) (SCM_TYP7 (obj) == scm_tc7_pws)
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#define SCM_PROCEDURE(obj) SCM_CADR (obj)
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#define SCM_SETTER(obj) SCM_CDDR (obj)
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extern scm_subr_entry *scm_subr_table;
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extern int scm_subr_table_size;
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extern int scm_subr_table_room;
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extern void scm_mark_subr_table (void);
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extern void scm_free_subr_entry (SCM subr);
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extern SCM scm_make_subr SCM_P ((const char *name, int type, SCM (*fcn) ()));
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extern SCM scm_make_subr_with_generic (const char *name,
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int type,
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SCM (*fcn) (),
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SCM *gf);
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extern SCM scm_make_subr_opt SCM_P ((const char *name,
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int type,
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SCM (*fcn) (),
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int set));
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extern SCM scm_makcclo SCM_P ((SCM proc, long len));
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extern SCM scm_procedure_p SCM_P ((SCM obj));
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extern SCM scm_closure_p SCM_P ((SCM obj));
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extern SCM scm_thunk_p SCM_P ((SCM obj));
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extern int scm_subr_p (SCM obj);
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extern SCM scm_procedure_documentation SCM_P ((SCM proc));
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extern SCM scm_procedure_with_setter_p SCM_P ((SCM obj));
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extern SCM scm_make_procedure_with_setter SCM_P ((SCM procedure, SCM setter));
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extern SCM scm_procedure SCM_P ((SCM proc));
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extern SCM scm_setter SCM_P ((SCM proc));
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extern void scm_init_iprocs SCM_P ((const scm_iproc *subra, int type));
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extern void scm_init_subr_table (void);
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extern void scm_init_procs SCM_P ((void));
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#ifdef GUILE_DEBUG
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extern SCM scm_make_cclo SCM_P ((SCM proc, SCM len));
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#endif /*GUILE_DEBUG*/
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#endif /* PROCSH */
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