#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"
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;
*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_dynwind_begin (0);
scm_i_dynwind_pthread_mutex_lock_block_asyncs (&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_dynwind_end ();
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
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"
}