/* Copyright (C) 1998, 2000, 2002 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. */ #include "libguile/_scm.h" #include "libguile/eval.h" #include "libguile/procprop.h" #include "libguile/vectors.h" #include "libguile/hashtab.h" #include "libguile/struct.h" #include "libguile/variable.h" #include "libguile/modules.h" static SCM the_root_module; static SCM root_module_lookup_closure; SCM scm_the_root_module () { return SCM_CDR (the_root_module); } static SCM the_module; SCM scm_selected_module () { return SCM_CDR (the_module); } static SCM set_current_module; SCM scm_select_module (SCM module) { SCM old = scm_selected_module (); scm_apply (SCM_CDR (set_current_module), SCM_LIST1 (module), SCM_EOL); return old; } SCM_SYMBOL (scm_sym_app, "app"); SCM_SYMBOL (scm_sym_modules, "modules"); static SCM module_prefix; static SCM scm_module_full_name (SCM name) { if (SCM_EQ_P (SCM_CAR (name), scm_sym_app)) return name; else return scm_append (SCM_LIST2 (module_prefix, name)); } static SCM make_modules_in; static SCM beautify_user_module_x; SCM scm_make_module (SCM name) { return scm_apply (SCM_CDR (make_modules_in), SCM_LIST2 (scm_the_root_module (), scm_module_full_name (name)), SCM_EOL); } SCM scm_ensure_user_module (SCM module) { scm_apply (SCM_CDR (beautify_user_module_x), SCM_LIST1 (module), SCM_EOL); return SCM_UNSPECIFIED; } static SCM module_eval_closure; SCM scm_module_lookup_closure (SCM module) { return scm_apply (SCM_CDR (module_eval_closure), SCM_LIST1 (module), SCM_EOL); } static SCM resolve_module; SCM scm_resolve_module (SCM name) { return scm_apply (SCM_CDR (resolve_module), SCM_LIST1 (name), SCM_EOL); } static SCM try_module_autoload; SCM scm_load_scheme_module (SCM name) { return scm_apply (SCM_CDR (try_module_autoload), SCM_LIST1 (name), SCM_EOL); } /* Environments */ SCM scm_top_level_env (SCM thunk) { if (SCM_IMP (thunk)) return SCM_EOL; else return scm_cons (thunk, SCM_EOL); } SCM scm_env_top_level (SCM env) { while (SCM_NIMP (env)) { if (!SCM_CONSP (SCM_CAR (env)) && SCM_NFALSEP (scm_procedure_p (SCM_CAR (env)))) return SCM_CAR (env); env = SCM_CDR (env); } return SCM_BOOL_F; } SCM_SYMBOL (scm_sym_system_module, "system-module"); SCM scm_system_module_env_p (SCM env) { SCM proc = scm_env_top_level (env); if (SCM_FALSEP (proc)) proc = root_module_lookup_closure; return ((SCM_NFALSEP (scm_procedure_property (proc, scm_sym_system_module))) ? SCM_BOOL_T : SCM_BOOL_F); } /* * C level implementation of the standard eval closure * * This increases loading speed substantially. * The code will be replaced by the low-level environments in next release. */ #define OBARRAY(module) (SCM_STRUCT_DATA (module) [0]) #define USES(module) (SCM_STRUCT_DATA (module) [1]) #define BINDER(module) (SCM_STRUCT_DATA (module) [2]) static SCM module_make_local_var_x; static SCM module_variable (SCM module, SCM sym) { /* 1. Check module obarray */ SCM b = scm_hashq_ref (OBARRAY (module), sym, SCM_UNDEFINED); if (SCM_VARIABLEP (b)) return b; { SCM binder = BINDER (module); if (SCM_NFALSEP (binder)) /* 2. Custom binder */ { b = scm_apply (binder, SCM_LIST3 (module, sym, SCM_BOOL_F), SCM_EOL); if (SCM_NFALSEP (b)) return b; } } { /* 3. Search the use list */ SCM uses = USES (module); while (SCM_CONSP (uses)) { b = module_variable (SCM_CAR (uses), sym); if (SCM_NFALSEP (b)) return b; uses = SCM_CDR (uses); } return SCM_BOOL_F; } } static SCM f_eval_closure; static SCM eval_closure (SCM cclo, SCM sym, SCM definep) { SCM module = SCM_VELTS (cclo) [1]; if (SCM_NFALSEP (definep)) return scm_apply (SCM_CDR (module_make_local_var_x), SCM_LIST2 (module, sym), SCM_EOL); else return module_variable (module, sym); } SCM_DEFINE (scm_standard_eval_closure, "standard-eval-closure", 1, 0, 0, (SCM module), "") #define FUNC_NAME s_scm_standard_eval_closure { SCM cclo = scm_makcclo (f_eval_closure, SCM_MAKINUM (2)); SCM_VELTS (cclo) [1] = module; return cclo; } #undef FUNC_NAME void scm_init_modules () { #include "libguile/modules.x" module_make_local_var_x = scm_sysintern ("module-make-local-var!", SCM_UNDEFINED); f_eval_closure = scm_make_subr_opt ("eval-closure", scm_tc7_subr_3, eval_closure, 0); } void scm_post_boot_init_modules () { the_root_module = scm_intern0 ("the-root-module"); the_module = scm_intern0 ("the-module"); set_current_module = scm_intern0 ("set-current-module"); module_prefix = scm_permanent_object (SCM_LIST2 (scm_sym_app, scm_sym_modules)); make_modules_in = scm_intern0 ("make-modules-in"); beautify_user_module_x = scm_intern0 ("beautify-user-module!"); module_eval_closure = scm_intern0 ("module-eval-closure"); root_module_lookup_closure = scm_permanent_object (scm_module_lookup_closure (SCM_CDR (the_root_module))); resolve_module = scm_intern0 ("resolve-module"); try_module_autoload = scm_intern0 ("try-module-autoload"); } /* Local Variables: c-file-style: "gnu" End: */