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fe2400c993
* libguile/procprop.c (scm_set_procedure_properties_x)[SCM_ENABLE_DEPRECATED == 1]: Pass arguments to `scm_assq' in the right order, and check its return value with `scm_is_true'. Reported by Mike Gran <spk121@yahoo.com>.
256 lines
7.1 KiB
C
256 lines
7.1 KiB
C
/* Copyright (C) 1995, 1996, 1998, 2000, 2001, 2003, 2004, 2006,
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* 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
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*
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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 License
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* as published by the Free Software Foundation; either version 3 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* 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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*
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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
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* 02110-1301 USA
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#define SCM_BUILDING_DEPRECATED_CODE
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#include "libguile/_scm.h"
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#include "libguile/alist.h"
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#include "libguile/deprecation.h"
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#include "libguile/deprecated.h"
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#include "libguile/eval.h"
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#include "libguile/procs.h"
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#include "libguile/gsubr.h"
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#include "libguile/smob.h"
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#include "libguile/root.h"
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#include "libguile/vectors.h"
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#include "libguile/hashtab.h"
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#include "libguile/programs.h"
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#include "libguile/validate.h"
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#include "libguile/procprop.h"
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SCM_GLOBAL_SYMBOL (scm_sym_system_procedure, "system-procedure");
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#if (SCM_ENABLE_DEPRECATED == 1)
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SCM_GLOBAL_SYMBOL (scm_sym_arity, "arity");
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#endif
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SCM_GLOBAL_SYMBOL (scm_sym_name, "name");
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static SCM overrides;
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static scm_i_pthread_mutex_t overrides_lock = SCM_I_PTHREAD_MUTEX_INITIALIZER;
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static SCM arity_overrides;
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int
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scm_i_procedure_arity (SCM proc, int *req, int *opt, int *rest)
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{
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SCM o;
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scm_i_pthread_mutex_lock (&overrides_lock);
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o = scm_hashq_ref (arity_overrides, proc, SCM_BOOL_F);
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scm_i_pthread_mutex_unlock (&overrides_lock);
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if (scm_is_true (o))
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{
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*req = scm_to_int (scm_car (o));
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*opt = scm_to_int (scm_cadr (o));
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*rest = scm_is_true (scm_caddr (o));
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return 1;
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}
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while (!SCM_PROGRAM_P (proc))
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{
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if (SCM_IMP (proc))
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return 0;
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switch (SCM_TYP7 (proc))
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{
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case scm_tc7_smob:
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if (!SCM_SMOB_APPLICABLE_P (proc))
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return 0;
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proc = scm_i_smob_apply_trampoline (proc);
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break;
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case scm_tcs_struct:
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if (!SCM_STRUCT_APPLICABLE_P (proc))
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return 0;
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proc = SCM_STRUCT_PROCEDURE (proc);
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break;
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default:
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return 0;
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}
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}
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return scm_i_program_arity (proc, req, opt, rest);
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}
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SCM_DEFINE (scm_set_procedure_minimum_arity_x, "set-procedure-minimum-arity!",
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4, 0, 0, (SCM proc, SCM req, SCM opt, SCM rest),
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"")
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#define FUNC_NAME s_scm_set_procedure_minimum_arity_x
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{
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int t SCM_UNUSED;
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SCM_VALIDATE_PROC (1, proc);
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SCM_VALIDATE_INT_COPY (2, req, t);
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SCM_VALIDATE_INT_COPY (3, opt, t);
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SCM_VALIDATE_BOOL (4, rest);
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scm_i_pthread_mutex_lock (&overrides_lock);
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scm_hashq_set_x (arity_overrides, proc, scm_list_3 (req, opt, rest));
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scm_i_pthread_mutex_unlock (&overrides_lock);
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return SCM_UNDEFINED;
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_procedure_minimum_arity, "procedure-minimum-arity", 1, 0, 0,
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(SCM proc),
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"Return the \"minimum arity\" of a procedure.\n\n"
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"If the procedure has only one arity, that arity is returned\n"
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"as a list of three values: the number of required arguments,\n"
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"the number of optional arguments, and a boolean indicating\n"
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"whether or not the procedure takes rest arguments.\n\n"
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"For a case-lambda procedure, the arity returned is the one\n"
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"with the lowest minimum number of arguments, and the highest\n"
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"maximum number of arguments.\n\n"
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"If it was not possible to determine the arity of the procedure,\n"
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"@code{#f} is returned.")
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#define FUNC_NAME s_scm_procedure_minimum_arity
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{
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int req, opt, rest;
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if (scm_i_procedure_arity (proc, &req, &opt, &rest))
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return scm_list_3 (scm_from_int (req),
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scm_from_int (opt),
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scm_from_bool (rest));
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else
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return SCM_BOOL_F;
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_procedure_properties, "procedure-properties", 1, 0, 0,
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(SCM proc),
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"Return @var{obj}'s property list.")
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#define FUNC_NAME s_scm_procedure_properties
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{
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SCM ret;
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SCM_VALIDATE_PROC (1, proc);
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scm_i_pthread_mutex_lock (&overrides_lock);
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ret = scm_hashq_ref (overrides, proc, SCM_BOOL_F);
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scm_i_pthread_mutex_unlock (&overrides_lock);
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if (scm_is_false (ret))
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{
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if (SCM_PROGRAM_P (proc))
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ret = scm_i_program_properties (proc);
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else
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ret = SCM_EOL;
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}
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#if (SCM_ENABLE_DEPRECATED == 1)
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ret = scm_acons (scm_sym_arity, scm_procedure_minimum_arity (proc), ret);
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#endif
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return ret;
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_set_procedure_properties_x, "set-procedure-properties!", 2, 0, 0,
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(SCM proc, SCM alist),
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"Set @var{proc}'s property list to @var{alist}.")
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#define FUNC_NAME s_scm_set_procedure_properties_x
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{
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SCM_VALIDATE_PROC (1, proc);
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#if (SCM_ENABLE_DEPRECATED == 1)
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if (scm_is_true (scm_assq (scm_sym_arity, alist)))
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SCM_MISC_ERROR ("arity is a read-only property", SCM_EOL);
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#endif
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scm_i_pthread_mutex_lock (&overrides_lock);
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scm_hashq_set_x (overrides, proc, alist);
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scm_i_pthread_mutex_unlock (&overrides_lock);
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return SCM_UNSPECIFIED;
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_procedure_property, "procedure-property", 2, 0, 0,
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(SCM proc, SCM key),
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"Return the property of @var{proc} with name @var{key}.")
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#define FUNC_NAME s_scm_procedure_property
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{
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SCM_VALIDATE_PROC (1, proc);
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#if (SCM_ENABLE_DEPRECATED == 1)
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if (scm_is_eq (key, scm_sym_arity))
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scm_c_issue_deprecation_warning
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("Accessing a procedure's arity via `procedure-property' is deprecated.\n"
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"Use `procedure-minimum-arity instead.");
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#endif
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return scm_assq_ref (scm_procedure_properties (proc), key);
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_set_procedure_property_x, "set-procedure-property!", 3, 0, 0,
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(SCM proc, SCM key, SCM val),
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"In @var{proc}'s property list, set the property named @var{key} to\n"
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"@var{val}.")
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#define FUNC_NAME s_scm_set_procedure_property_x
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{
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SCM props;
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SCM_VALIDATE_PROC (1, proc);
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#if (SCM_ENABLE_DEPRECATED == 1)
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if (scm_is_eq (key, scm_sym_arity))
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SCM_MISC_ERROR ("arity is a deprecated read-only property", SCM_EOL);
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#endif
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scm_i_pthread_mutex_lock (&overrides_lock);
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props = scm_hashq_ref (overrides, proc, SCM_BOOL_F);
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if (scm_is_false (props))
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{
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if (SCM_PROGRAM_P (proc))
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props = scm_i_program_properties (proc);
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else
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props = SCM_EOL;
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}
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scm_hashq_set_x (overrides, proc, scm_assq_set_x (props, key, val));
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scm_i_pthread_mutex_unlock (&overrides_lock);
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return SCM_UNSPECIFIED;
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}
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#undef FUNC_NAME
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void
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scm_init_procprop ()
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{
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overrides = scm_make_weak_key_hash_table (SCM_UNDEFINED);
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arity_overrides = scm_make_weak_key_hash_table (SCM_UNDEFINED);
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#include "libguile/procprop.x"
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}
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/*
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Local Variables:
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c-file-style: "gnu"
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End:
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*/
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