#ifndef PROCSH
#define PROCSH
-/* Copyright (C) 1995,1996 Free Software Foundation, Inc.
+/* Copyright (C) 1995, 1996, 1998, 1999, 2000 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
* 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. */
+
+/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
+ gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
\f
#include "libguile/__scm.h"
/* Subrs
*/
-typedef struct scm_subr
+typedef struct
{
- long sname;
- SCM (*cproc) ();
-} scm_subr;
+ SCM handle; /* link back to procedure object */
+ SCM name;
+ SCM *generic; /* 0 if no generic support
+ * *generic == 0 until first method
+ */
+} scm_subr_entry;
-typedef struct scm_iproc
-{
- char *scm_string;
- SCM (*cproc) ();
-} scm_iproc;
+#define SCM_SUBRNUM(subr) (SCM_CELL_WORD_0 (subr) >> 8)
+#define SCM_SET_SUBRNUM(subr, num) \
+ SCM_SET_CELL_WORD_0 (subr, (num << 8) + SCM_TYP7 (subr))
+#define SCM_SUBR_ENTRY(x) (scm_subr_table[SCM_SUBRNUM (x)])
+#define SCM_SNAME(x) (SCM_SUBR_ENTRY (x).name)
+#define SCM_SUBRF(x) ((SCM (*)()) SCM_CELL_WORD_1 (x))
+#define SCM_SET_SUBRF(x, v) (SCM_SET_CELL_WORD_1 ((x), (v)))
+#define SCM_DSUBRF(x) ((double (*)()) SCM_CELL_WORD_1 (x))
+#define SCM_SUBR_GENERIC(x) (SCM_SUBR_ENTRY (x).generic)
-typedef struct scm_dsubr
-{
- long sname;
- double (*dproc) ();
-} scm_dsubr;
+#define SCM_CCLO_LENGTH(x) (SCM_CELL_WORD_0 (x) >> 8)
+#define SCM_SET_CCLO_LENGTH(x, v) (SCM_SET_CELL_WORD_0 ((x), ((v) << 8) + scm_tc7_cclo))
+#define SCM_CCLO_BASE(x) ((scm_bits_t *) SCM_CELL_WORD_1 (x))
+#define SCM_SET_CCLO_BASE(x, v) (SCM_SET_CELL_WORD_1 ((x), (v)))
-#define SCM_SNAME(x) ((SCM_CAR(x)>>8)?(SCM)(scm_heap_org+(SCM_CAR(x)>>8)):scm_nullstr)
-#define SCM_SUBRF(x) (((scm_subr *)(SCM2PTR(x)))->cproc)
-#define SCM_DSUBRF(x) (((scm_dsubr *)(SCM2PTR(x)))->dproc)
-#define SCM_CCLO_SUBR(x) (SCM_VELTS(x)[0])
+#define SCM_CCLO_REF(x, i) (SCM_PACK (SCM_CCLO_BASE (x) [i]))
+#define SCM_CCLO_SET(x, i, v) (SCM_CCLO_BASE (x) [i] = SCM_UNPACK (v))
+
+#define SCM_CCLO_SUBR(x) (SCM_CCLO_REF ((x), 0))
+#define SCM_SET_CCLO_SUBR(x, v) (SCM_CCLO_SET ((x), 0, (v)))
/* Closures
*/
-#define SCM_CLOSUREP(x) (SCM_TYP3(x)==scm_tc3_closure)
-#define SCM_CLOSCAR(x) (SCM_CAR(x)-scm_tc3_closure)
-#define SCM_CODE(x) SCM_CAR(SCM_CLOSCAR (x))
-#define SCM_PROCPROPS(x) SCM_CDR(SCM_CLOSCAR (x))
-#define SCM_SETPROCPROPS(x, p) SCM_SETCDR(SCM_CLOSCAR (x), p)
-#define SCM_SETCODE(x, e) (SCM_SETCAR (x, scm_cons ((e), SCM_EOL) + scm_tc3_closure))
+#define SCM_CLOSUREP(x) (SCM_NIMP(x) && (SCM_TYP3 (x) == scm_tc3_closure))
+#define SCM_CLOSCAR(x) SCM_PACK (SCM_CELL_WORD_0 (x) - scm_tc3_closure)
+#define SCM_CODE(x) SCM_CAR (SCM_CLOSCAR (x))
+#define SCM_PROCPROPS(x) SCM_CDR (SCM_CLOSCAR (x))
+#define SCM_SETPROCPROPS(x, p) SCM_SETCDR (SCM_CLOSCAR (x), p)
+#define SCM_SETCODE(x, e) (SCM_SET_CELL_WORD_0 (x, SCM_UNPACK (scm_cons ((e), SCM_EOL)) \
+ + scm_tc3_closure))
#define SCM_ENV(x) SCM_CDR(x)
#define SCM_SETENV(x, e) SCM_SETCDR (x, e)
-#define SCM_TOP_LEVEL(SCM_ENV) (SCM_NULLP(SCM_ENV) || (SCM_BOOL_T == scm_procedure_p (SCM_CAR (SCM_ENV))))
+#define SCM_TOP_LEVEL(ENV) (SCM_NULLP (ENV) || (SCM_EQ_P (scm_procedure_p (SCM_CAR (ENV)), SCM_BOOL_T)))
+
+/* Procedure-with-setter
+
+ Four representations for procedure-with-setters were
+ considered before selecting this one:
+
+ 1. A closure where the CODE and ENV slots are used to represent
+ the getter and a new SETTER slot is used for the setter. The
+ original getter is stored as a `getter' procedure property. For
+ closure getters, the CODE and ENV slots contains a copy of the
+ getter's CODE and ENV slots. For subr getters, the CODE contains
+ a call to the subr.
+
+ 2. A compiled closure with a call to the getter in the cclo
+ procedure. The getter and setter are stored in slots 1 and 2.
+
+ 3. An entity (i.e. a struct with an associated procedure) with a
+ call to the getter in the entity procedure and the setter stored
+ in slot 0. The original getter is stored in slot 1.
+
+ 4. A new primitive procedure type supported in the evaluator. The
+ getter and setter are stored in a GETTER and SETTER slot. A call
+ to this procedure type results in a retrieval of the getter and a
+ jump back to the correct eval dispatcher.
+
+ Representation 4 was selected because of efficiency and
+ simplicity.
+
+ Rep 1 has the advantage that there is zero penalty for closure
+ getters, but primitive getters will get considerable overhead
+ because the procedure-with-getter will be a closure which calls
+ the getter.
+
+ Rep 3 has the advantage that a GOOPS accessor can be a subclass of
+ <procedure-with-setter>, but together with rep 2 it suffers from a
+ three level dispatch for non-GOOPS getters:
+
+ cclo/struct --> dispatch proc --> getter
+
+ This is because the dispatch procedure must take an extra initial
+ argument (cclo for rep 2, struct for rep 3).
+
+ Rep 4 has the single disadvantage that it uses up one tc7 type
+ code, but the plan for uniform vectors will very likely free tc7
+ codes, so this is probably no big problem. Also note that the
+ GETTER and SETTER slots can live directly on the heap, using the
+ new four-word cells. */
+
+#define SCM_PROCEDURE_WITH_SETTER_P(obj) (SCM_NIMP(obj) && (SCM_TYP7 (obj) == scm_tc7_pws))
+#define SCM_PROCEDURE(obj) SCM_CELL_OBJECT_1 (obj)
+#define SCM_SETTER(obj) SCM_CELL_OBJECT_2 (obj)
+
+extern scm_subr_entry *scm_subr_table;
+extern int scm_subr_table_size;
+extern int scm_subr_table_room;
\f
-extern SCM scm_make_subr SCM_P ((char *name, int type, SCM (*fcn) ()));
-extern SCM scm_make_subr_opt SCM_P ((char *name, int type, SCM (*fcn) (),
- int set));
-extern SCM scm_makcclo SCM_P ((SCM proc, long len));
-extern SCM scm_procedure_p SCM_P ((SCM obj));
-extern SCM scm_closure_p SCM_P ((SCM obj));
-extern SCM scm_thunk_p SCM_P ((SCM obj));
-extern void scm_init_iprocs SCM_P ((scm_iproc *subra, int type));
-extern void scm_init_procs SCM_P ((void));
+extern void scm_mark_subr_table (void);
+extern void scm_free_subr_entry (SCM subr);
+extern SCM scm_make_subr (const char *name, int type, SCM (*fcn) ());
+extern SCM scm_make_subr_with_generic (const char *name,
+ int type,
+ SCM (*fcn) (),
+ SCM *gf);
+extern SCM scm_make_subr_opt (const char *name,
+ int type,
+ SCM (*fcn) (),
+ int set);
+extern SCM scm_makcclo (SCM proc, long len);
+extern SCM scm_procedure_p (SCM obj);
+extern SCM scm_closure_p (SCM obj);
+extern SCM scm_thunk_p (SCM obj);
+extern int scm_subr_p (SCM obj);
+extern SCM scm_procedure_documentation (SCM proc);
+extern SCM scm_procedure_with_setter_p (SCM obj);
+extern SCM scm_make_procedure_with_setter (SCM procedure, SCM setter);
+extern SCM scm_procedure (SCM proc);
+extern SCM scm_setter (SCM proc);
+extern void scm_init_subr_table (void);
+extern void scm_init_procs (void);
+
+#ifdef GUILE_DEBUG
+extern SCM scm_make_cclo (SCM proc, SCM len);
+#endif /*GUILE_DEBUG*/
\f
+
+#if (SCM_DEBUG_DEPRECATED == 0)
+
+#define SCM_SUBR_PROPS(x) SCM_EOL
+#define SCM_SUBR_DOC(x) SCM_BOOL_F
+
+#endif /* SCM_DEBUG_DEPRECATED == 0 */
+
#endif /* PROCSH */
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/
HCoop / bpt / guile.git / blobdiff