#ifndef PROCSH
#define PROCSH
-/* Copyright (C) 1995,1996,1998 Free Software Foundation, Inc.
+/* Copyright (C) 1995, 1996, 1998, 1999 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
double (*dproc) ();
} scm_dsubr;
-#define SCM_SNAME(x) ((SCM_CAR(x)>>8)?(SCM)(scm_heap_org+(SCM_CAR(x)>>8)):scm_nullstr)
+typedef struct
+{
+ SCM handle; /* link back to procedure object */
+ SCM name;
+ SCM *generic; /* 0 if no generic support
+ * *generic == 0 until first method
+ */
+ SCM properties; /* procedure properties */
+ SCM documentation;
+} scm_subr_entry;
+
+#define SCM_SUBRNUM(subr) (SCM_CAR (subr) >> 8)
+#define SCM_SET_SUBRNUM(subr, num) \
+ SCM_SETCAR (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_subr *)(SCM2PTR(x)))->cproc)
#define SCM_DSUBRF(x) (((scm_dsubr *)(SCM2PTR(x)))->dproc)
#define SCM_CCLO_SUBR(x) (SCM_VELTS(x)[0])
+#define SCM_SUBR_GENERIC(x) (SCM_SUBR_ENTRY (x).generic)
+#define SCM_SUBR_PROPS(x) (SCM_SUBR_ENTRY (x).properties)
+#define SCM_SUBR_DOC(x) (SCM_SUBR_ENTRY (x).documentation)
+
/* Closures
*/
#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))))
-/* Prcoedure-with-setter
- */
+/* 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_TYP7 (obj) == scm_tc7_pws)
#define SCM_PROCEDURE(obj) SCM_CADR (obj)
#define SCM_SETTER(obj) SCM_CDDR (obj)
+extern scm_subr_entry *scm_subr_table;
+extern int scm_subr_table_size;
+extern int scm_subr_table_room;
+
\f
+extern void scm_mark_subr_table (void);
+extern void scm_free_subr_entry (SCM subr);
extern SCM scm_make_subr SCM_P ((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 SCM_P ((const char *name,
int type,
SCM (*fcn) (),
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 int scm_subr_p (SCM obj);
extern SCM scm_procedure_documentation SCM_P ((SCM proc));
extern SCM scm_procedure_with_setter_p SCM_P ((SCM obj));
extern SCM scm_make_procedure_with_setter SCM_P ((SCM procedure, SCM setter));
extern SCM scm_procedure SCM_P ((SCM proc));
extern SCM scm_setter SCM_P ((SCM proc));
extern void scm_init_iprocs SCM_P ((const scm_iproc *subra, int type));
+extern void scm_init_subr_table (void);
extern void scm_init_procs SCM_P ((void));
#ifdef GUILE_DEBUG
HCoop / bpt / guile.git / blobdiff