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Diffstat (limited to 'src/envs.c')
| -rw-r--r-- | src/envs.c | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/src/envs.c b/src/envs.c new file mode 100644 index 000000000..434b98fab --- /dev/null +++ b/src/envs.c @@ -0,0 +1,259 @@ +/* Copyright (C) 2001 Free Software Foundation, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this software; see the file COPYING. If not, write to + * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, + * Boston, MA 02111-1307 USA + * + * As a special exception, the Free Software Foundation gives permission + * for additional uses of the text contained in its release of GUILE. + * + * The exception is that, if you link the GUILE library with other files + * to produce an executable, this does not by itself cause the + * resulting executable to be covered by the GNU General Public License. + * Your use of that executable is in no way restricted on account of + * linking the GUILE library code into it. + * + * This exception does not however invalidate any other reasons why + * the executable file might be covered by the GNU General Public License. + * + * This exception applies only to the code released by the + * Free Software Foundation under the name GUILE. If you copy + * code from other Free Software Foundation releases into a copy of + * GUILE, as the General Public License permits, the exception does + * not apply to the code that you add in this way. To avoid misleading + * anyone as to the status of such modified files, you must delete + * this exception notice from them. + * + * If you write modifications of your own for GUILE, it is your choice + * whether to permit this exception to apply to your modifications. + * If you do not wish that, delete this exception notice. */ + +#if HAVE_CONFIG_H +# include <config.h> +#endif + +#include <string.h> +#include "envs.h" + +#define ENV_OBARRAY_SIZE 31 + + +scm_t_bits scm_tc16_env; + +SCM +scm_c_make_env (void) +{ + struct scm_env *p = scm_gc_malloc (sizeof (struct scm_env), + "env"); + p->identifier = SCM_BOOL_F; + p->obarray = scm_c_make_hash_table (ENV_OBARRAY_SIZE); + SCM_RETURN_NEWSMOB (scm_tc16_env, p); +} + +static SCM +env_mark (SCM obj) +{ + struct scm_env *p = SCM_ENV_DATA (obj); + scm_gc_mark (p->identifier); + return p->obarray; +} + +static scm_sizet +env_free (SCM obj) +{ + scm_gc_free (SCM_ENV_DATA (obj), sizeof (struct scm_env), + "env"); + return 0; +} + + +/* + * C interface + */ + +static SCM env_table; +static SCM load_env; + +SCM +scm_c_lookup_env (SCM identifier) +{ + /* Check if the env is already loaded */ + SCM vcell = scm_hash_get_handle (env_table, identifier); + + /* If not, load the env */ + if (SCM_FALSEP (vcell)) + { + SCM env = scm_apply (SCM_CDR (load_env), + SCM_LIST1 (identifier), SCM_EOL); + if (!SCM_ENV_P (env)) + scm_misc_error ("scm_c_lookup_env", + "Invalid env: ~S", SCM_LIST1 (env)); + vcell = scm_hash_create_handle_x (env_table, identifier, env); + } + + return (SCM_CDR (vcell)); +} + +SCM +scm_c_env_vcell (SCM env, SCM name, int intern) +{ + SCM vcell; + SCM ob = SCM_ENV_OBARRAY (env); + + if (intern) + vcell = scm_hash_create_handle_x (ob, name, SCM_UNSPECIFIED); + else + vcell = scm_hash_get_handle (ob, name); + + return vcell; +} + + +/* + * Scheme interface + */ + +SCM_DEFINE (scm_make_env, "make-env", 0, 0, 0, + (), + "") +#define FUNC_NAME s_scm_make_env +{ + return scm_c_make_env (); +} +#undef FUNC_NAME + +SCM_DEFINE (scm_env_p, "env?", 1, 0, 0, + (SCM x), + "") +#define FUNC_NAME s_scm_env_p +{ + return SCM_BOOL (SCM_ENV_P (x)); +} +#undef FUNC_NAME + +SCM_DEFINE (scm_env_identifier, "env-identifier", 1, 0, 0, + (SCM env), + "") +#define FUNC_NAME s_scm_env_identifier +{ + SCM_VALIDATE_ENV (1, env); + return SCM_ENV_IDENTIFIER (env); +} +#undef FUNC_NAME + +SCM_DEFINE (scm_set_env_identifier_x, "set-env-identifier!", 2, 0, 0, + (SCM env, SCM identifier), + "") +#define FUNC_NAME s_scm_set_env_identifier_x +{ + SCM_VALIDATE_ENV (1, env); + SCM_VALIDATE_SYMBOL (2, identifier); + SCM_ENV_IDENTIFIER (env) = identifier; + return SCM_UNSPECIFIED; +} +#undef FUNC_NAME + +SCM_DEFINE (scm_env_bound_p, "env-bound?", 2, 0, 0, + (SCM env, SCM name), + "") +#define FUNC_NAME s_scm_env_bound_p +{ + SCM obarray, vcell; + SCM_VALIDATE_ENV (1, env); + SCM_VALIDATE_SYMBOL (2, name); + + obarray = SCM_ENV_OBARRAY (env); + vcell = scm_hash_get_handle (obarray, name); + + return SCM_BOOL (!SCM_FALSEP (vcell) && !SCM_UNBNDP (SCM_CDR (vcell))); +} +#undef FUNC_NAME + +SCM_DEFINE (scm_env_ref, "env-ref", 2, 0, 0, + (SCM env, SCM name), + "") +#define FUNC_NAME s_scm_env_ref +{ + SCM vcell; + SCM_VALIDATE_ENV (1, env); + SCM_VALIDATE_SYMBOL (2, name); + vcell = scm_hash_get_handle (name, SCM_ENV_OBARRAY (env)); + if (SCM_FALSEP (vcell) || SCM_UNBNDP (SCM_CDR (vcell))) + SCM_MISC_ERROR ("Unbound variable in env: ~A, ~A", + SCM_LIST2 (env, name)); + return SCM_CDR (vcell); +} +#undef FUNC_NAME + +SCM_DEFINE (scm_env_set_x, "env-set!", 3, 0, 0, + (SCM env, SCM name, SCM val), + "") +#define FUNC_NAME s_scm_env_set_x +{ + SCM vcell; + SCM_VALIDATE_ENV (1, env); + SCM_VALIDATE_SYMBOL (2, name); + vcell = scm_hash_get_handle (name, SCM_ENV_OBARRAY (env)); + if (SCM_FALSEP (vcell)) + SCM_MISC_ERROR ("Unbound variable in env: ~A, ~A", + SCM_LIST2 (env, name)); + SCM_SETCDR (vcell, val); + + return SCM_UNSPECIFIED; +} +#undef FUNC_NAME + +SCM_DEFINE (scm_env_define, "env-define", 3, 0, 0, + (SCM env, SCM name, SCM val), + "") +#define FUNC_NAME s_scm_env_define +{ + SCM vcell; + SCM_VALIDATE_ENV (1, env); + SCM_VALIDATE_SYMBOL (2, name); + vcell = scm_c_env_vcell (env, name, 1); + SCM_SETCDR (vcell, val); + return SCM_UNSPECIFIED; +} +#undef FUNC_NAME + + +void +scm_init_envs (void) +{ + SCM mod; + + scm_tc16_env = scm_make_smob_type ("env", 0); + scm_set_smob_mark (scm_tc16_env, env_mark); + scm_set_smob_free (scm_tc16_env, env_free); + + env_table = scm_permanent_object (scm_c_make_hash_table (51)); + +#ifndef SCM_MAGIC_SNARFER +#include "envs.x" +#endif + + mod = scm_current_module (); + load_env = scm_eval_closure_lookup (scm_standard_eval_closure (mod), + scm_str2symbol ("load-env"), + SCM_BOOL_T); + load_env = scm_variable_ref (load_env); + /* Was: SCM_VARVCELL (load_env); */ +} + +/* + Local Variables: + c-file-style: "gnu" + End: +*/ |