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/* Copyright (C) 1995,1996,1998,1999,2000,2001, 2006 Free Software Foundation, Inc.
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* This library 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 GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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#include "libguile/__scm.h"
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SCM handle; /* link back to procedure object */
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SCM *generic; /* 0 if no generic support
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* *generic == 0 until first method
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SCM properties; /* procedure properties */
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#define SCM_SUBRNUM(subr) (SCM_CELL_WORD_0 (subr) >> 8)
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#define SCM_SET_SUBRNUM(subr, num) \
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SCM_SET_CELL_WORD_0 (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 (*)()) SCM_CELL_WORD_1 (x))
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#define SCM_SET_SUBRF(x, v) (SCM_SET_CELL_WORD_1 ((x), (v)))
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#define SCM_DSUBRF(x) ((double (*)()) SCM_CELL_WORD_1 (x))
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#define SCM_SUBR_PROPS(x) (SCM_SUBR_ENTRY (x).properties)
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#define SCM_SUBR_GENERIC(x) (SCM_SUBR_ENTRY (x).generic)
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#define SCM_CCLO_LENGTH(x) (SCM_CELL_WORD_0 (x) >> 8)
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#define SCM_MAKE_CCLO_TAG(v) (((v) << 8) + scm_tc7_cclo)
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#define SCM_SET_CCLO_LENGTH(x, v) (SCM_SET_CELL_WORD_0 ((x), SCM_MAKE_CCLO_TAG(v)))
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#define SCM_CCLO_BASE(x) ((scm_t_bits *) SCM_CELL_WORD_1 (x))
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#define SCM_SET_CCLO_BASE(x, v) (SCM_SET_CELL_WORD_1 ((x), (v)))
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#define SCM_CCLO_REF(x, i) (SCM_PACK (SCM_CCLO_BASE (x) [i]))
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#define SCM_CCLO_SET(x, i, v) (SCM_CCLO_BASE (x) [i] = SCM_UNPACK (v))
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#define SCM_CCLO_SUBR(x) (SCM_CCLO_REF ((x), 0))
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#define SCM_SET_CCLO_SUBR(x, v) (SCM_CCLO_SET ((x), 0, (v)))
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#define SCM_CLOSUREP(x) (!SCM_IMP(x) && (SCM_TYP3 (x) == scm_tc3_closure))
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#define SCM_CLOSCAR(x) SCM_PACK (SCM_CELL_WORD_0 (x) - scm_tc3_closure)
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#define SCM_CODE(x) SCM_CAR (SCM_CLOSCAR (x))
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#define SCM_CLOSURE_FORMALS(x) SCM_CAR (SCM_CODE (x))
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#define SCM_CLOSURE_BODY(x) SCM_CDR (SCM_CODE (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_SET_CELL_WORD_0 (x, SCM_UNPACK (scm_cons ((e), SCM_EOL)) \
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#define SCM_ENV(x) SCM_CELL_OBJECT_1 (x)
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#define SCM_SETENV(x, e) SCM_SET_CELL_OBJECT_1 ((x), (e))
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#define SCM_TOP_LEVEL(ENV) (scm_is_null (ENV) || (scm_is_true (scm_procedure_p (SCM_CAR (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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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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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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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_IMP(obj) && (SCM_TYP7 (obj) == scm_tc7_pws))
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#define SCM_PROCEDURE(obj) SCM_CELL_OBJECT_1 (obj)
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#define SCM_SETTER(obj) SCM_CELL_OBJECT_2 (obj)
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SCM_API scm_t_subr_entry *scm_subr_table;
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SCM_API long scm_subr_table_size;
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SCM_API long scm_subr_table_room;
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SCM_API void scm_mark_subr_table (void);
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SCM_API void scm_free_subr_entry (SCM subr);
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SCM_API SCM scm_c_make_subr (const char *name, long type, SCM (*fcn)());
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SCM_API SCM scm_c_make_subr_with_generic (const char *name, long type,
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SCM (*fcn)(), SCM *gf);
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SCM_API SCM scm_c_define_subr (const char *name, long type, SCM (*fcn)());
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SCM_API SCM scm_c_define_subr_with_generic (const char *name, long type,
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SCM (*fcn)(), SCM *gf);
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SCM_API SCM scm_makcclo (SCM proc, size_t len);
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SCM_API SCM scm_procedure_p (SCM obj);
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SCM_API SCM scm_closure_p (SCM obj);
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SCM_API SCM scm_thunk_p (SCM obj);
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SCM_API int scm_subr_p (SCM obj);
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SCM_API SCM scm_procedure_documentation (SCM proc);
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SCM_API SCM scm_procedure_with_setter_p (SCM obj);
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SCM_API SCM scm_make_procedure_with_setter (SCM procedure, SCM setter);
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SCM_API SCM scm_procedure (SCM proc);
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SCM_API SCM scm_setter (SCM proc);
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SCM_API void scm_init_subr_table (void);
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SCM_API void scm_init_procs (void);
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SCM_API SCM scm_make_cclo (SCM proc, SCM len);
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#endif /*GUILE_DEBUG*/
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#endif /* SCM_PROCS_H */
added
removed
libguile/procs.h
