--- /dev/null
+/* Copyright (C) 1998,2000,2001,2002, 2003, 2004, 2006, 2008 Free Software Foundation, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+
+\f
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <stdarg.h>
+
+#include "libguile/_scm.h"
+
+#include "libguile/eval.h"
+#include "libguile/smob.h"
+#include "libguile/procprop.h"
+#include "libguile/vectors.h"
+#include "libguile/hashtab.h"
+#include "libguile/struct.h"
+#include "libguile/variable.h"
+#include "libguile/fluids.h"
+#include "libguile/deprecation.h"
+
+#include "libguile/modules.h"
+
+int scm_module_system_booted_p = 0;
+
+scm_t_bits scm_module_tag;
+
+static SCM the_module;
+
+static SCM the_root_module_var;
+
+static SCM
+the_root_module ()
+{
+ if (scm_module_system_booted_p)
+ return SCM_VARIABLE_REF (the_root_module_var);
+ else
+ return SCM_BOOL_F;
+}
+
+SCM_DEFINE (scm_current_module, "current-module", 0, 0, 0,
+ (),
+ "Return the current module.")
+#define FUNC_NAME s_scm_current_module
+{
+ SCM curr = scm_fluid_ref (the_module);
+
+ return scm_is_true (curr) ? curr : the_root_module ();
+}
+#undef FUNC_NAME
+
+static void scm_post_boot_init_modules (void);
+
+SCM_DEFINE (scm_set_current_module, "set-current-module", 1, 0, 0,
+ (SCM module),
+ "Set the current module to @var{module} and return\n"
+ "the previous current module.")
+#define FUNC_NAME s_scm_set_current_module
+{
+ SCM old;
+
+ if (!scm_module_system_booted_p)
+ scm_post_boot_init_modules ();
+
+ SCM_VALIDATE_MODULE (SCM_ARG1, module);
+
+ old = scm_current_module ();
+ scm_fluid_set_x (the_module, module);
+
+ return old;
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_interaction_environment, "interaction-environment", 0, 0, 0,
+ (),
+ "Return a specifier for the environment that contains\n"
+ "implementation--defined bindings, typically a superset of those\n"
+ "listed in the report. The intent is that this procedure will\n"
+ "return the environment in which the implementation would\n"
+ "evaluate expressions dynamically typed by the user.")
+#define FUNC_NAME s_scm_interaction_environment
+{
+ return scm_current_module ();
+}
+#undef FUNC_NAME
+
+SCM
+scm_c_call_with_current_module (SCM module,
+ SCM (*func)(void *), void *data)
+{
+ return scm_c_with_fluid (the_module, module, func, data);
+}
+
+void
+scm_dynwind_current_module (SCM module)
+{
+ scm_dynwind_fluid (the_module, module);
+}
+
+/*
+ convert "A B C" to scheme list (A B C)
+ */
+static SCM
+convert_module_name (const char *name)
+{
+ SCM list = SCM_EOL;
+ SCM *tail = &list;
+
+ const char *ptr;
+ while (*name)
+ {
+ while (*name == ' ')
+ name++;
+ ptr = name;
+ while (*ptr && *ptr != ' ')
+ ptr++;
+ if (ptr > name)
+ {
+ SCM sym = scm_from_locale_symboln (name, ptr-name);
+ *tail = scm_cons (sym, SCM_EOL);
+ tail = SCM_CDRLOC (*tail);
+ }
+ name = ptr;
+ }
+
+ return list;
+}
+
+static SCM process_define_module_var;
+static SCM process_use_modules_var;
+static SCM resolve_module_var;
+
+SCM
+scm_c_resolve_module (const char *name)
+{
+ return scm_resolve_module (convert_module_name (name));
+}
+
+SCM
+scm_resolve_module (SCM name)
+{
+ return scm_call_1 (SCM_VARIABLE_REF (resolve_module_var), name);
+}
+
+SCM
+scm_c_define_module (const char *name,
+ void (*init)(void *), void *data)
+{
+ SCM module = scm_call_1 (SCM_VARIABLE_REF (process_define_module_var),
+ scm_list_1 (convert_module_name (name)));
+ if (init)
+ scm_c_call_with_current_module (module, (SCM (*)(void*))init, data);
+ return module;
+}
+
+void
+scm_c_use_module (const char *name)
+{
+ scm_call_1 (SCM_VARIABLE_REF (process_use_modules_var),
+ scm_list_1 (scm_list_1 (convert_module_name (name))));
+}
+
+static SCM module_export_x_var;
+
+
+/*
+ TODO: should export this function? --hwn.
+ */
+static SCM
+scm_export (SCM module, SCM namelist)
+{
+ return scm_call_2 (SCM_VARIABLE_REF (module_export_x_var),
+ module, namelist);
+}
+
+
+/*
+ @code{scm_c_export}(@var{name-list})
+
+ @code{scm_c_export} exports the named bindings from the current
+ module, making them visible to users of the module. This function
+ takes a list of string arguments, terminated by NULL, e.g.
+
+ @example
+ scm_c_export ("add-double-record", "bamboozle-money", NULL);
+ @end example
+*/
+void
+scm_c_export (const char *name, ...)
+{
+ if (name)
+ {
+ va_list ap;
+ SCM names = scm_cons (scm_from_locale_symbol (name), SCM_EOL);
+ SCM *tail = SCM_CDRLOC (names);
+ va_start (ap, name);
+ while (1)
+ {
+ const char *n = va_arg (ap, const char *);
+ if (n == NULL)
+ break;
+ *tail = scm_cons (scm_from_locale_symbol (n), SCM_EOL);
+ tail = SCM_CDRLOC (*tail);
+ }
+ va_end (ap);
+ scm_export (scm_current_module(), names);
+ }
+}
+
+
+/* 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_is_pair (env))
+ {
+ SCM car_env = SCM_CAR (env);
+ if (!scm_is_pair (car_env) && scm_is_true (scm_procedure_p (car_env)))
+ return car_env;
+ env = SCM_CDR (env);
+ }
+ return SCM_BOOL_F;
+}
+
+SCM_SYMBOL (sym_module, "module");
+
+SCM
+scm_lookup_closure_module (SCM proc)
+{
+ if (scm_is_false (proc))
+ return the_root_module ();
+ else if (SCM_EVAL_CLOSURE_P (proc))
+ return SCM_PACK (SCM_SMOB_DATA (proc));
+ else
+ {
+ SCM mod = scm_procedure_property (proc, sym_module);
+ if (scm_is_false (mod))
+ mod = the_root_module ();
+ return mod;
+ }
+}
+
+SCM_DEFINE (scm_env_module, "env-module", 1, 0, 0,
+ (SCM env),
+ "Return the module of @var{ENV}, a lexical environment.")
+#define FUNC_NAME s_scm_env_module
+{
+ return scm_lookup_closure_module (scm_env_top_level (env));
+}
+#undef FUNC_NAME
+
+/*
+ * 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.
+ */
+
+static SCM module_make_local_var_x_var;
+
+static SCM
+module_variable (SCM module, SCM sym)
+{
+#define SCM_BOUND_THING_P(b) \
+ (scm_is_true (b))
+
+ /* 1. Check module obarray */
+ SCM b = scm_hashq_ref (SCM_MODULE_OBARRAY (module), sym, SCM_UNDEFINED);
+ if (SCM_BOUND_THING_P (b))
+ return b;
+ {
+ SCM binder = SCM_MODULE_BINDER (module);
+ if (scm_is_true (binder))
+ /* 2. Custom binder */
+ {
+ b = scm_call_3 (binder, module, sym, SCM_BOOL_F);
+ if (SCM_BOUND_THING_P (b))
+ return b;
+ }
+ }
+ {
+ /* 3. Search the use list */
+ SCM uses = SCM_MODULE_USES (module);
+ while (scm_is_pair (uses))
+ {
+ b = module_variable (SCM_CAR (uses), sym);
+ if (SCM_BOUND_THING_P (b))
+ return b;
+ uses = SCM_CDR (uses);
+ }
+ return SCM_BOOL_F;
+ }
+#undef SCM_BOUND_THING_P
+}
+
+scm_t_bits scm_tc16_eval_closure;
+
+#define SCM_F_EVAL_CLOSURE_INTERFACE (1<<16)
+#define SCM_EVAL_CLOSURE_INTERFACE_P(e) \
+ (SCM_CELL_WORD_0 (e) & SCM_F_EVAL_CLOSURE_INTERFACE)
+
+/* NOTE: This function may be called by a smob application
+ or from another C function directly. */
+SCM
+scm_eval_closure_lookup (SCM eclo, SCM sym, SCM definep)
+{
+ SCM module = SCM_PACK (SCM_SMOB_DATA (eclo));
+ if (scm_is_true (definep))
+ {
+ if (SCM_EVAL_CLOSURE_INTERFACE_P (eclo))
+ return SCM_BOOL_F;
+ return scm_call_2 (SCM_VARIABLE_REF (module_make_local_var_x_var),
+ module, sym);
+ }
+ else
+ return module_variable (module, sym);
+}
+
+SCM_DEFINE (scm_standard_eval_closure, "standard-eval-closure", 1, 0, 0,
+ (SCM module),
+ "Return an eval closure for the module @var{module}.")
+#define FUNC_NAME s_scm_standard_eval_closure
+{
+ SCM_RETURN_NEWSMOB (scm_tc16_eval_closure, SCM_UNPACK (module));
+}
+#undef FUNC_NAME
+
+
+SCM_DEFINE (scm_standard_interface_eval_closure,
+ "standard-interface-eval-closure", 1, 0, 0,
+ (SCM module),
+ "Return a interface eval closure for the module @var{module}. "
+ "Such a closure does not allow new bindings to be added.")
+#define FUNC_NAME s_scm_standard_interface_eval_closure
+{
+ SCM_RETURN_NEWSMOB (scm_tc16_eval_closure | SCM_F_EVAL_CLOSURE_INTERFACE,
+ SCM_UNPACK (module));
+}
+#undef FUNC_NAME
+
+SCM
+scm_module_lookup_closure (SCM module)
+{
+ if (scm_is_false (module))
+ return SCM_BOOL_F;
+ else
+ return SCM_MODULE_EVAL_CLOSURE (module);
+}
+
+SCM
+scm_current_module_lookup_closure ()
+{
+ if (scm_module_system_booted_p)
+ return scm_module_lookup_closure (scm_current_module ());
+ else
+ return SCM_BOOL_F;
+}
+
+SCM
+scm_module_transformer (SCM module)
+{
+ if (scm_is_false (module))
+ return SCM_BOOL_F;
+ else
+ return SCM_MODULE_TRANSFORMER (module);
+}
+
+SCM
+scm_current_module_transformer ()
+{
+ if (scm_module_system_booted_p)
+ return scm_module_transformer (scm_current_module ());
+ else
+ return SCM_BOOL_F;
+}
+
+SCM_DEFINE (scm_module_import_interface, "module-import-interface", 2, 0, 0,
+ (SCM module, SCM sym),
+ "")
+#define FUNC_NAME s_scm_module_import_interface
+{
+#define SCM_BOUND_THING_P(b) (scm_is_true (b))
+ SCM uses;
+ SCM_VALIDATE_MODULE (SCM_ARG1, module);
+ /* Search the use list */
+ uses = SCM_MODULE_USES (module);
+ while (scm_is_pair (uses))
+ {
+ SCM _interface = SCM_CAR (uses);
+ /* 1. Check module obarray */
+ SCM b = scm_hashq_ref (SCM_MODULE_OBARRAY (_interface), sym, SCM_BOOL_F);
+ if (SCM_BOUND_THING_P (b))
+ return _interface;
+ {
+ SCM binder = SCM_MODULE_BINDER (_interface);
+ if (scm_is_true (binder))
+ /* 2. Custom binder */
+ {
+ b = scm_call_3 (binder, _interface, sym, SCM_BOOL_F);
+ if (SCM_BOUND_THING_P (b))
+ return _interface;
+ }
+ }
+ /* 3. Search use list recursively. */
+ _interface = scm_module_import_interface (_interface, sym);
+ if (scm_is_true (_interface))
+ return _interface;
+ uses = SCM_CDR (uses);
+ }
+ return SCM_BOOL_F;
+}
+#undef FUNC_NAME
+
+/* scm_sym2var
+ *
+ * looks up the variable bound to SYM according to PROC. PROC should be
+ * a `eval closure' of some module.
+ *
+ * When no binding exists, and DEFINEP is true, create a new binding
+ * with a initial value of SCM_UNDEFINED. Return `#f' when DEFINEP as
+ * false and no binding exists.
+ *
+ * When PROC is `#f', it is ignored and the binding is searched for in
+ * the scm_pre_modules_obarray (a `eq' hash table).
+ */
+
+SCM scm_pre_modules_obarray;
+
+SCM
+scm_sym2var (SCM sym, SCM proc, SCM definep)
+#define FUNC_NAME "scm_sym2var"
+{
+ SCM var;
+
+ if (SCM_NIMP (proc))
+ {
+ if (SCM_EVAL_CLOSURE_P (proc))
+ {
+ /* Bypass evaluator in the standard case. */
+ var = scm_eval_closure_lookup (proc, sym, definep);
+ }
+ else
+ var = scm_call_2 (proc, sym, definep);
+ }
+ else
+ {
+ SCM handle;
+
+ if (scm_is_false (definep))
+ var = scm_hashq_ref (scm_pre_modules_obarray, sym, SCM_BOOL_F);
+ else
+ {
+ handle = scm_hashq_create_handle_x (scm_pre_modules_obarray,
+ sym, SCM_BOOL_F);
+ var = SCM_CDR (handle);
+ if (scm_is_false (var))
+ {
+ var = scm_make_variable (SCM_UNDEFINED);
+ SCM_SETCDR (handle, var);
+ }
+ }
+ }
+
+ if (scm_is_true (var) && !SCM_VARIABLEP (var))
+ SCM_MISC_ERROR ("~S is not bound to a variable", scm_list_1 (sym));
+
+ return var;
+}
+#undef FUNC_NAME
+
+SCM
+scm_c_module_lookup (SCM module, const char *name)
+{
+ return scm_module_lookup (module, scm_from_locale_symbol (name));
+}
+
+SCM
+scm_module_lookup (SCM module, SCM sym)
+#define FUNC_NAME "module-lookup"
+{
+ SCM var;
+ SCM_VALIDATE_MODULE (1, module);
+
+ var = scm_sym2var (sym, scm_module_lookup_closure (module), SCM_BOOL_F);
+ if (scm_is_false (var))
+ SCM_MISC_ERROR ("unbound variable: ~S", scm_list_1 (sym));
+ return var;
+}
+#undef FUNC_NAME
+
+SCM
+scm_c_lookup (const char *name)
+{
+ return scm_lookup (scm_from_locale_symbol (name));
+}
+
+SCM
+scm_lookup (SCM sym)
+{
+ SCM var =
+ scm_sym2var (sym, scm_current_module_lookup_closure (), SCM_BOOL_F);
+ if (scm_is_false (var))
+ scm_misc_error ("scm_lookup", "unbound variable: ~S", scm_list_1 (sym));
+ return var;
+}
+
+SCM
+scm_c_module_define (SCM module, const char *name, SCM value)
+{
+ return scm_module_define (module, scm_from_locale_symbol (name), value);
+}
+
+SCM
+scm_module_define (SCM module, SCM sym, SCM value)
+#define FUNC_NAME "module-define"
+{
+ SCM var;
+ SCM_VALIDATE_MODULE (1, module);
+
+ var = scm_sym2var (sym, scm_module_lookup_closure (module), SCM_BOOL_T);
+ SCM_VARIABLE_SET (var, value);
+ return var;
+}
+#undef FUNC_NAME
+
+SCM
+scm_c_define (const char *name, SCM value)
+{
+ return scm_define (scm_from_locale_symbol (name), value);
+}
+
+SCM
+scm_define (SCM sym, SCM value)
+{
+ SCM var =
+ scm_sym2var (sym, scm_current_module_lookup_closure (), SCM_BOOL_T);
+ SCM_VARIABLE_SET (var, value);
+ return var;
+}
+
+SCM
+scm_module_reverse_lookup (SCM module, SCM variable)
+#define FUNC_NAME "module-reverse-lookup"
+{
+ SCM obarray;
+ long i, n;
+
+ if (scm_is_false (module))
+ obarray = scm_pre_modules_obarray;
+ else
+ {
+ SCM_VALIDATE_MODULE (1, module);
+ obarray = SCM_MODULE_OBARRAY (module);
+ }
+
+ if (!SCM_HASHTABLE_P (obarray))
+ return SCM_BOOL_F;
+
+ /* XXX - We do not use scm_hash_fold here to avoid searching the
+ whole obarray. We should have a scm_hash_find procedure. */
+
+ n = SCM_HASHTABLE_N_BUCKETS (obarray);
+ for (i = 0; i < n; ++i)
+ {
+ SCM ls = SCM_HASHTABLE_BUCKET (obarray, i), handle;
+ while (!scm_is_null (ls))
+ {
+ handle = SCM_CAR (ls);
+ if (SCM_CDR (handle) == variable)
+ return SCM_CAR (handle);
+ ls = SCM_CDR (ls);
+ }
+ }
+
+ /* Try the `uses' list.
+ */
+ {
+ SCM uses = SCM_MODULE_USES (module);
+ while (scm_is_pair (uses))
+ {
+ SCM sym = scm_module_reverse_lookup (SCM_CAR (uses), variable);
+ if (scm_is_true (sym))
+ return sym;
+ uses = SCM_CDR (uses);
+ }
+ }
+
+ return SCM_BOOL_F;
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_get_pre_modules_obarray, "%get-pre-modules-obarray", 0, 0, 0,
+ (),
+ "Return the obarray that is used for all new bindings before "
+ "the module system is booted. The first call to "
+ "@code{set-current-module} will boot the module system.")
+#define FUNC_NAME s_scm_get_pre_modules_obarray
+{
+ return scm_pre_modules_obarray;
+}
+#undef FUNC_NAME
+
+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_is_false (proc))
+ return SCM_BOOL_T;
+ return ((scm_is_true (scm_procedure_property (proc,
+ scm_sym_system_module)))
+ ? SCM_BOOL_T
+ : SCM_BOOL_F);
+}
+
+void
+scm_modules_prehistory ()
+{
+ scm_pre_modules_obarray
+ = scm_permanent_object (scm_c_make_hash_table (1533));
+}
+
+void
+scm_init_modules ()
+{
+#include "libguile/modules.x"
+ module_make_local_var_x_var = scm_c_define ("module-make-local-var!",
+ SCM_UNDEFINED);
+ scm_tc16_eval_closure = scm_make_smob_type ("eval-closure", 0);
+ scm_set_smob_mark (scm_tc16_eval_closure, scm_markcdr);
+ scm_set_smob_apply (scm_tc16_eval_closure, scm_eval_closure_lookup, 2, 0, 0);
+
+ the_module = scm_permanent_object (scm_make_fluid ());
+}
+
+static void
+scm_post_boot_init_modules ()
+{
+#define PERM(x) scm_permanent_object(x)
+
+ SCM module_type = SCM_VARIABLE_REF (scm_c_lookup ("module-type"));
+ scm_module_tag = (SCM_CELL_WORD_1 (module_type) + scm_tc3_struct);
+
+ resolve_module_var = PERM (scm_c_lookup ("resolve-module"));
+ process_define_module_var = PERM (scm_c_lookup ("process-define-module"));
+ process_use_modules_var = PERM (scm_c_lookup ("process-use-modules"));
+ module_export_x_var = PERM (scm_c_lookup ("module-export!"));
+ the_root_module_var = PERM (scm_c_lookup ("the-root-module"));
+
+ scm_module_system_booted_p = 1;
+}
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/
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