1 /* Copyright (C) 1995,1996,1998,2000,2001,2003,2004, 2006, 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
3 * This library is free software; you can redistribute it and/or
4 * modify it under the terms of the GNU Lesser General Public License
5 * as published by the Free Software Foundation; either version 3 of
6 * the License, or (at your option) any later version.
8 * This library is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * Lesser General Public License for more details.
13 * You should have received a copy of the GNU Lesser General Public
14 * License along with this library; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
25 #include "libguile/_scm.h"
27 #include "libguile/alist.h"
28 #include "libguile/eval.h"
29 #include "libguile/procs.h"
30 #include "libguile/gsubr.h"
31 #include "libguile/smob.h"
32 #include "libguile/root.h"
33 #include "libguile/vectors.h"
34 #include "libguile/weak-table.h"
35 #include "libguile/programs.h"
37 #include "libguile/validate.h"
38 #include "libguile/procprop.h"
41 SCM_GLOBAL_SYMBOL (scm_sym_system_procedure
, "system-procedure");
42 SCM_GLOBAL_SYMBOL (scm_sym_name
, "name");
46 static SCM arity_overrides
;
49 scm_i_procedure_arity (SCM proc
, int *req
, int *opt
, int *rest
)
53 o
= scm_weak_table_refq (arity_overrides
, proc
, SCM_BOOL_F
);
57 *req
= scm_to_int (scm_car (o
));
58 *opt
= scm_to_int (scm_cadr (o
));
59 *rest
= scm_is_true (scm_caddr (o
));
63 while (!SCM_PROGRAM_P (proc
))
65 if (SCM_STRUCTP (proc
))
67 if (!SCM_STRUCT_APPLICABLE_P (proc
))
69 proc
= SCM_STRUCT_PROCEDURE (proc
);
71 else if (SCM_HAS_TYP7 (proc
, scm_tc7_smob
))
73 if (!SCM_SMOB_APPLICABLE_P (proc
))
75 if (!scm_i_program_arity (SCM_SMOB_DESCRIPTOR (proc
).apply_trampoline
,
79 /* The trampoline gets the smob too, which users don't
89 return scm_i_program_arity (proc
, req
, opt
, rest
);
92 SCM_DEFINE (scm_set_procedure_minimum_arity_x
, "set-procedure-minimum-arity!",
93 4, 0, 0, (SCM proc
, SCM req
, SCM opt
, SCM rest
),
95 #define FUNC_NAME s_scm_set_procedure_minimum_arity_x
99 SCM_VALIDATE_PROC (1, proc
);
100 SCM_VALIDATE_INT_COPY (2, req
, t
);
101 SCM_VALIDATE_INT_COPY (3, opt
, t
);
102 SCM_VALIDATE_BOOL (4, rest
);
104 scm_weak_table_putq_x (arity_overrides
, proc
, scm_list_3 (req
, opt
, rest
));
105 return SCM_UNDEFINED
;
109 SCM_DEFINE (scm_procedure_minimum_arity
, "procedure-minimum-arity", 1, 0, 0,
111 "Return the \"minimum arity\" of a procedure.\n\n"
112 "If the procedure has only one arity, that arity is returned\n"
113 "as a list of three values: the number of required arguments,\n"
114 "the number of optional arguments, and a boolean indicating\n"
115 "whether or not the procedure takes rest arguments.\n\n"
116 "For a case-lambda procedure, the arity returned is the one\n"
117 "with the lowest minimum number of arguments, and the highest\n"
118 "maximum number of arguments.\n\n"
119 "If it was not possible to determine the arity of the procedure,\n"
120 "@code{#f} is returned.")
121 #define FUNC_NAME s_scm_procedure_minimum_arity
125 if (scm_i_procedure_arity (proc
, &req
, &opt
, &rest
))
126 return scm_list_3 (scm_from_int (req
),
128 scm_from_bool (rest
));
134 SCM_DEFINE (scm_procedure_properties
, "procedure-properties", 1, 0, 0,
136 "Return @var{proc}'s property list.")
137 #define FUNC_NAME s_scm_procedure_properties
141 SCM_VALIDATE_PROC (1, proc
);
143 ret
= scm_weak_table_refq (overrides
, proc
, SCM_BOOL_F
);
145 if (scm_is_false (ret
))
147 if (SCM_PROGRAM_P (proc
))
148 ret
= scm_i_program_properties (proc
);
157 SCM_DEFINE (scm_set_procedure_properties_x
, "set-procedure-properties!", 2, 0, 0,
158 (SCM proc
, SCM alist
),
159 "Set @var{proc}'s property list to @var{alist}.")
160 #define FUNC_NAME s_scm_set_procedure_properties_x
162 SCM_VALIDATE_PROC (1, proc
);
164 scm_weak_table_putq_x (overrides
, proc
, alist
);
166 return SCM_UNSPECIFIED
;
170 SCM_DEFINE (scm_procedure_property
, "procedure-property", 2, 0, 0,
172 "Return the property of @var{proc} with name @var{key}.")
173 #define FUNC_NAME s_scm_procedure_property
175 SCM_VALIDATE_PROC (1, proc
);
177 return scm_assq_ref (scm_procedure_properties (proc
), key
);
181 SCM_DEFINE (scm_set_procedure_property_x
, "set-procedure-property!", 3, 0, 0,
182 (SCM proc
, SCM key
, SCM val
),
183 "In @var{proc}'s property list, set the property named @var{key} to\n"
185 #define FUNC_NAME s_scm_set_procedure_property_x
189 SCM_VALIDATE_PROC (1, proc
);
191 scm_i_pthread_mutex_lock (&scm_i_misc_mutex
);
192 props
= scm_weak_table_refq (overrides
, proc
, SCM_BOOL_F
);
193 if (scm_is_false (props
))
195 if (SCM_PROGRAM_P (proc
))
196 props
= scm_i_program_properties (proc
);
200 scm_weak_table_putq_x (overrides
, proc
, scm_assq_set_x (props
, key
, val
));
201 scm_i_pthread_mutex_unlock (&scm_i_misc_mutex
);
203 return SCM_UNSPECIFIED
;
213 overrides
= scm_c_make_weak_table (0, SCM_WEAK_TABLE_KIND_KEY
);
214 arity_overrides
= scm_c_make_weak_table (0, SCM_WEAK_TABLE_KIND_KEY
);
215 #include "libguile/procprop.x"