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* libguile/variable.h: * libguile/variable.c: Define a "struct scm_variable" and allocate it via scm_allocate_tagged.
107 lines
2.8 KiB
C
107 lines
2.8 KiB
C
#ifndef SCM_VARIABLE_H
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#define SCM_VARIABLE_H
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/* Copyright 1995-1996,2000-2001,2006,2008,2011,2018,2025
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Free Software Foundation, Inc.
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This file is part of Guile.
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Guile is free software: you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Guile is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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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 Guile. If not, see
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<https://www.gnu.org/licenses/>. */
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#include <libguile/error.h>
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#include <libguile/gc.h>
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#include <libguile/snarf.h>
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/* Variables
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*/
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struct scm_variable
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{
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scm_t_bits tag;
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SCM value;
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};
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static inline int
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scm_is_variable (SCM x)
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{
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return SCM_HAS_TYP7 (x, scm_tc7_variable);
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}
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static inline struct scm_variable *
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scm_to_variable (SCM x)
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{
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if (!scm_is_variable (x))
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abort ();
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return (struct scm_variable *) SCM_UNPACK_POINTER (x);
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}
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static inline SCM
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scm_from_variable (struct scm_variable *var)
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{
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return SCM_PACK_POINTER (var);
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}
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static inline SCM*
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scm_variable_loc (struct scm_variable *var)
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{
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return &var->value;
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}
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#define SCM_VARIABLEP(x) scm_is_variable (x)
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#define SCM_VARIABLE_REF(v) (scm_to_variable (v)->value)
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#define SCM_VARIABLE_SET(v, x) (scm_to_variable (v)->value = (x))
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#define SCM_VARIABLE_LOC(v) scm_variable_loc (scm_to_variable (v))
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#define SCM_VALIDATE_VARIABLE(pos, var) \
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SCM_MAKE_VALIDATE_MSG (pos, var, VARIABLEP, "variable")
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#define SCM_VARIABLE(c_name, scheme_name) \
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SCM_SNARF_HERE(static SCM c_name) \
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SCM_SNARF_INIT(c_name = scm_c_define (scheme_name, SCM_BOOL_F);)
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#define SCM_GLOBAL_VARIABLE(c_name, scheme_name) \
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SCM_SNARF_HERE(SCM c_name) \
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SCM_SNARF_INIT(c_name = scm_c_define (scheme_name, SCM_BOOL_F);)
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#define SCM_VARIABLE_INIT(c_name, scheme_name, init_val) \
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SCM_SNARF_HERE(static SCM c_name) \
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SCM_SNARF_INIT(c_name = scm_c_define (scheme_name, init_val);)
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#define SCM_GLOBAL_VARIABLE_INIT(c_name, scheme_name, init_val) \
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SCM_SNARF_HERE(SCM c_name) \
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SCM_SNARF_INIT(c_name = scm_c_define (scheme_name, init_val);)
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SCM_API SCM scm_make_variable (SCM init);
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SCM_API SCM scm_make_undefined_variable (void);
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SCM_API SCM scm_variable_p (SCM obj);
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SCM_API SCM scm_variable_ref (SCM var);
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SCM_API SCM scm_variable_set_x (SCM var, SCM val);
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SCM_API SCM scm_variable_unset_x (SCM var);
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SCM_API SCM scm_variable_bound_p (SCM var);
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SCM_INTERNAL void scm_i_variable_print (SCM var, SCM port, scm_print_state *pstate);
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SCM_INTERNAL void scm_init_variable (void);
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#endif /* SCM_VARIABLE_H */
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