-/* Copyright (C) 1995,1996,1998,2000,2001,2003,2004, 2006, 2008, 2009 Free Software Foundation, Inc.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library 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
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-
-\f
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
-
-#include "libguile/_scm.h"
-
-#include "libguile/alist.h"
-#include "libguile/eval.h"
-#include "libguile/procs.h"
-#include "libguile/gsubr.h"
-#include "libguile/objects.h"
-#include "libguile/smob.h"
-#include "libguile/root.h"
-#include "libguile/vectors.h"
-#include "libguile/hashtab.h"
-
-#include "libguile/validate.h"
-#include "libguile/procprop.h"
-\f
-
-SCM_GLOBAL_SYMBOL (scm_sym_system_procedure, "system-procedure");
-SCM_GLOBAL_SYMBOL (scm_sym_arity, "arity");
-
-SCM
-scm_i_procedure_arity (SCM proc)
-{
- int a = 0, o = 0, r = 0;
- if (SCM_IMP (proc))
- return SCM_BOOL_F;
- loop:
- switch (SCM_TYP7 (proc))
- {
- case scm_tc7_subr_1o:
- o = 1;
- case scm_tc7_subr_0:
- break;
- case scm_tc7_subr_2o:
- o = 1;
- case scm_tc7_subr_1:
- case scm_tc7_dsubr:
- case scm_tc7_cxr:
- a += 1;
- break;
- case scm_tc7_subr_2:
- a += 2;
- break;
- case scm_tc7_subr_3:
- a += 3;
- break;
- case scm_tc7_asubr:
- case scm_tc7_rpsubr:
- case scm_tc7_lsubr:
- r = 1;
- break;
- case scm_tc7_lsubr_2:
- a += 2;
- r = 1;
- break;
- case scm_tc7_smob:
- if (SCM_SMOB_APPLICABLE_P (proc))
- {
- int type = SCM_SMOB_DESCRIPTOR (proc).gsubr_type;
- a += SCM_GSUBR_REQ (type);
- o = SCM_GSUBR_OPT (type);
- r = SCM_GSUBR_REST (type);
- break;
- }
- else
- {
- return SCM_BOOL_F;
- }
- case scm_tc7_gsubr:
- {
- unsigned int type = SCM_GSUBR_TYPE (proc);
- a = SCM_GSUBR_REQ (type);
- o = SCM_GSUBR_OPT (type);
- r = SCM_GSUBR_REST (type);
- break;
- }
- case scm_tc7_pws:
- proc = SCM_PROCEDURE (proc);
- goto loop;
- case scm_tcs_closures:
- proc = SCM_CLOSURE_FORMALS (proc);
- if (scm_is_null (proc))
- break;
- while (scm_is_pair (proc))
- {
- ++a;
- proc = SCM_CDR (proc);
- }
- if (!scm_is_null (proc))
- r = 1;
- break;
- case scm_tcs_struct:
- if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC)
- {
- r = 1;
- break;
- }
- else if (!SCM_I_OPERATORP (proc))
- return SCM_BOOL_F;
- proc = (SCM_I_ENTITYP (proc)
- ? SCM_ENTITY_PROCEDURE (proc)
- : SCM_OPERATOR_PROCEDURE (proc));
- a -= 1;
- goto loop;
- default:
- return SCM_BOOL_F;
- }
- return scm_list_3 (scm_from_int (a), scm_from_int (o), scm_from_bool(r));
-}
-
-/* XXX - instead of using a stand-in value for everything except
- closures, we should find other ways to store the procedure
- properties for those other kinds of procedures. For example, subrs
- have their own property slot, which is unused at present.
-*/
-
-static SCM
-scm_stand_in_scm_proc(SCM proc)
-{
- SCM handle, answer;
- handle = scm_hashq_get_handle (scm_stand_in_procs, proc);
- if (scm_is_false (handle))
- {
- answer = scm_closure (scm_list_2 (SCM_EOL, SCM_BOOL_F), SCM_EOL);
- scm_hashq_set_x (scm_stand_in_procs, proc, answer);
- }
- else
- answer = SCM_CDR (handle);
- return answer;
-}
-
-SCM_DEFINE (scm_procedure_properties, "procedure-properties", 1, 0, 0,
- (SCM proc),
- "Return @var{obj}'s property list.")
-#define FUNC_NAME s_scm_procedure_properties
-{
- SCM_VALIDATE_PROC (1, proc);
- return scm_acons (scm_sym_arity, scm_i_procedure_arity (proc),
- SCM_PROCPROPS (SCM_CLOSUREP (proc)
- ? proc
- : scm_stand_in_scm_proc (proc)));
-}
-#undef FUNC_NAME
-
-SCM_DEFINE (scm_set_procedure_properties_x, "set-procedure-properties!", 2, 0, 0,
- (SCM proc, SCM new_val),
- "Set @var{obj}'s property list to @var{alist}.")
-#define FUNC_NAME s_scm_set_procedure_properties_x
-{
- if (!SCM_CLOSUREP (proc))
- proc = scm_stand_in_scm_proc(proc);
- SCM_VALIDATE_CLOSURE (1, proc);
- SCM_SETPROCPROPS (proc, new_val);
- return SCM_UNSPECIFIED;
-}
-#undef FUNC_NAME
-
-SCM_DEFINE (scm_procedure_property, "procedure-property", 2, 0, 0,
- (SCM p, SCM k),
- "Return the property of @var{obj} with name @var{key}.")
-#define FUNC_NAME s_scm_procedure_property
-{
- SCM assoc;
- if (scm_is_eq (k, scm_sym_arity))
- {
- SCM arity;
- SCM_ASSERT (scm_is_true (arity = scm_i_procedure_arity (p)),
- p, SCM_ARG1, FUNC_NAME);
- return arity;
- }
- SCM_VALIDATE_PROC (1, p);
- assoc = scm_sloppy_assq (k,
- SCM_PROCPROPS (SCM_CLOSUREP (p)
- ? p
- : scm_stand_in_scm_proc (p)));
- return (SCM_NIMP (assoc) ? SCM_CDR (assoc) : SCM_BOOL_F);
-}
-#undef FUNC_NAME
-
-SCM_DEFINE (scm_set_procedure_property_x, "set-procedure-property!", 3, 0, 0,
- (SCM p, SCM k, SCM v),
- "In @var{obj}'s property list, set the property named @var{key} to\n"
- "@var{value}.")
-#define FUNC_NAME s_scm_set_procedure_property_x
-{
- SCM assoc;
- if (!SCM_CLOSUREP (p))
- p = scm_stand_in_scm_proc(p);
- SCM_VALIDATE_CLOSURE (1, p);
- if (scm_is_eq (k, scm_sym_arity))
- SCM_MISC_ERROR ("arity is a read-only property", SCM_EOL);
- assoc = scm_sloppy_assq (k, SCM_PROCPROPS (p));
- if (SCM_NIMP (assoc))
- SCM_SETCDR (assoc, v);
- else
- SCM_SETPROCPROPS (p, scm_acons (k, v, SCM_PROCPROPS (p)));
- return SCM_UNSPECIFIED;
-}
-#undef FUNC_NAME
-
-\f
-
-
-void
-scm_init_procprop ()
-{
-#include "libguile/procprop.x"
-}
-
-
-/*
- Local Variables:
- c-file-style: "gnu"
- End:
-*/
+/* Copyright (C) 1995, 1996, 1998, 2000, 2001, 2003, 2004, 2006,
+ * 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+
+\f
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#define SCM_BUILDING_DEPRECATED_CODE
+
+#include "libguile/_scm.h"
+
+#include "libguile/alist.h"
+#include "libguile/deprecation.h"
+#include "libguile/deprecated.h"
+#include "libguile/eval.h"
+#include "libguile/procs.h"
+#include "libguile/gsubr.h"
+#include "libguile/smob.h"
+#include "libguile/root.h"
+#include "libguile/vectors.h"
+#include "libguile/hashtab.h"
+#include "libguile/programs.h"
+
+#include "libguile/validate.h"
+#include "libguile/procprop.h"
+\f
+
+SCM_GLOBAL_SYMBOL (scm_sym_system_procedure, "system-procedure");
+#if (SCM_ENABLE_DEPRECATED == 1)
+SCM_GLOBAL_SYMBOL (scm_sym_arity, "arity");
+#endif
+SCM_GLOBAL_SYMBOL (scm_sym_name, "name");
+
+static SCM overrides;
+static scm_i_pthread_mutex_t overrides_lock = SCM_I_PTHREAD_MUTEX_INITIALIZER;
+
+static SCM arity_overrides;
+
+int
+scm_i_procedure_arity (SCM proc, int *req, int *opt, int *rest)
+{
+ SCM o;
+
+ scm_i_pthread_mutex_lock (&overrides_lock);
+ o = scm_hashq_ref (arity_overrides, proc, SCM_BOOL_F);
+ scm_i_pthread_mutex_unlock (&overrides_lock);
+
+ if (scm_is_true (o))
+ {
+ *req = scm_to_int (scm_car (o));
+ *opt = scm_to_int (scm_cadr (o));
+ *rest = scm_is_true (scm_caddr (o));
+ return 1;
+ }
+
+ while (!SCM_PROGRAM_P (proc))
+ {
+ if (SCM_IMP (proc))
+ return 0;
+ switch (SCM_TYP7 (proc))
+ {
+ case scm_tc7_smob:
+ if (!SCM_SMOB_APPLICABLE_P (proc))
+ return 0;
+ if (!scm_i_program_arity
+ (SCM_SMOB_DESCRIPTOR (proc).apply_trampoline_objcode,
+ req, opt, rest))
+ return 0;
+
+ /* The trampoline gets the smob too, which users don't
+ see. */
+ *req -= 1;
+
+ return 1;
+ case scm_tcs_struct:
+ if (!SCM_STRUCT_APPLICABLE_P (proc))
+ return 0;
+ proc = SCM_STRUCT_PROCEDURE (proc);
+ break;
+ default:
+ return 0;
+ }
+ }
+
+ return scm_i_program_arity (proc, req, opt, rest);
+}
+
+SCM_DEFINE (scm_set_procedure_minimum_arity_x, "set-procedure-minimum-arity!",
+ 4, 0, 0, (SCM proc, SCM req, SCM opt, SCM rest),
+ "")
+#define FUNC_NAME s_scm_set_procedure_minimum_arity_x
+{
+ int t SCM_UNUSED;
+
+ SCM_VALIDATE_PROC (1, proc);
+ SCM_VALIDATE_INT_COPY (2, req, t);
+ SCM_VALIDATE_INT_COPY (3, opt, t);
+ SCM_VALIDATE_BOOL (4, rest);
+
+ scm_i_pthread_mutex_lock (&overrides_lock);
+ scm_hashq_set_x (arity_overrides, proc, scm_list_3 (req, opt, rest));
+ scm_i_pthread_mutex_unlock (&overrides_lock);
+ return SCM_UNDEFINED;
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_procedure_minimum_arity, "procedure-minimum-arity", 1, 0, 0,
+ (SCM proc),
+ "Return the \"minimum arity\" of a procedure.\n\n"
+ "If the procedure has only one arity, that arity is returned\n"
+ "as a list of three values: the number of required arguments,\n"
+ "the number of optional arguments, and a boolean indicating\n"
+ "whether or not the procedure takes rest arguments.\n\n"
+ "For a case-lambda procedure, the arity returned is the one\n"
+ "with the lowest minimum number of arguments, and the highest\n"
+ "maximum number of arguments.\n\n"
+ "If it was not possible to determine the arity of the procedure,\n"
+ "@code{#f} is returned.")
+#define FUNC_NAME s_scm_procedure_minimum_arity
+{
+ int req, opt, rest;
+
+ if (scm_i_procedure_arity (proc, &req, &opt, &rest))
+ return scm_list_3 (scm_from_int (req),
+ scm_from_int (opt),
+ scm_from_bool (rest));
+ else
+ return SCM_BOOL_F;
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_procedure_properties, "procedure-properties", 1, 0, 0,
+ (SCM proc),
+ "Return @var{proc}'s property list.")
+#define FUNC_NAME s_scm_procedure_properties
+{
+ SCM ret;
+
+ SCM_VALIDATE_PROC (1, proc);
+
+ scm_i_pthread_mutex_lock (&overrides_lock);
+ ret = scm_hashq_ref (overrides, proc, SCM_BOOL_F);
+ scm_i_pthread_mutex_unlock (&overrides_lock);
+
+ if (scm_is_false (ret))
+ {
+ if (SCM_PROGRAM_P (proc))
+ ret = scm_i_program_properties (proc);
+ else
+ ret = SCM_EOL;
+ }
+
+#if (SCM_ENABLE_DEPRECATED == 1)
+ ret = scm_acons (scm_sym_arity, scm_procedure_minimum_arity (proc), ret);
+#endif
+
+ return ret;
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_set_procedure_properties_x, "set-procedure-properties!", 2, 0, 0,
+ (SCM proc, SCM alist),
+ "Set @var{proc}'s property list to @var{alist}.")
+#define FUNC_NAME s_scm_set_procedure_properties_x
+{
+ SCM_VALIDATE_PROC (1, proc);
+
+#if (SCM_ENABLE_DEPRECATED == 1)
+ if (scm_is_true (scm_assq (scm_sym_arity, alist)))
+ SCM_MISC_ERROR ("arity is a read-only property", SCM_EOL);
+#endif
+
+ scm_i_pthread_mutex_lock (&overrides_lock);
+ scm_hashq_set_x (overrides, proc, alist);
+ scm_i_pthread_mutex_unlock (&overrides_lock);
+
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_procedure_property, "procedure-property", 2, 0, 0,
+ (SCM proc, SCM key),
+ "Return the property of @var{proc} with name @var{key}.")
+#define FUNC_NAME s_scm_procedure_property
+{
+ SCM_VALIDATE_PROC (1, proc);
+
+#if (SCM_ENABLE_DEPRECATED == 1)
+ if (scm_is_eq (key, scm_sym_arity))
+ scm_c_issue_deprecation_warning
+ ("Accessing a procedure's arity via `procedure-property' is deprecated.\n"
+ "Use `procedure-minimum-arity instead.");
+#endif
+
+ return scm_assq_ref (scm_procedure_properties (proc), key);
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_set_procedure_property_x, "set-procedure-property!", 3, 0, 0,
+ (SCM proc, SCM key, SCM val),
+ "In @var{proc}'s property list, set the property named @var{key} to\n"
+ "@var{val}.")
+#define FUNC_NAME s_scm_set_procedure_property_x
+{
+ SCM props;
+
+ SCM_VALIDATE_PROC (1, proc);
+
+#if (SCM_ENABLE_DEPRECATED == 1)
+ if (scm_is_eq (key, scm_sym_arity))
+ SCM_MISC_ERROR ("arity is a deprecated read-only property", SCM_EOL);
+#endif
+
+ scm_i_pthread_mutex_lock (&overrides_lock);
+ props = scm_hashq_ref (overrides, proc, SCM_BOOL_F);
+ if (scm_is_false (props))
+ {
+ if (SCM_PROGRAM_P (proc))
+ props = scm_i_program_properties (proc);
+ else
+ props = SCM_EOL;
+ }
+ scm_hashq_set_x (overrides, proc, scm_assq_set_x (props, key, val));
+ scm_i_pthread_mutex_unlock (&overrides_lock);
+
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+\f
+
+
+void
+scm_init_procprop ()
+{
+ overrides = scm_make_weak_key_hash_table (SCM_UNDEFINED);
+ arity_overrides = scm_make_weak_key_hash_table (SCM_UNDEFINED);
+#include "libguile/procprop.x"
+}
+
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/
HCoop / bpt / guile.git / blobdiff