New VM.

src/envs.c

@@ -0,0 +1,250 @@
+/* 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.  */
+
+#include <string.h>
+#include "envs.h"
+
+#define ENV_OBARRAY_SIZE 31
+
+
+scm_bits_t scm_tc16_env;
+
+SCM
+scm_c_make_env (void)
+{
+  struct scm_env *p = scm_must_malloc (sizeof (struct scm_env),
+				       "scm_c_make_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_must_free (SCM_ENV_DATA (obj));
+  return sizeof (struct scm_env);
+}
+
+
+/*
+ * 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_sym2ovcell_soft (identifier, env_table);
+
+  /* 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));
+      scm_intern_symbol (env_table, identifier);
+      vcell = scm_sym2ovcell_soft (identifier, env_table);
+      SCM_SETCDR (vcell, env);
+    }
+
+  return SCM_CDR (vcell);
+}
+
+SCM
+scm_c_env_vcell (SCM env, SCM name, int intern)
+{
+  SCM ob = SCM_ENV_OBARRAY (env);
+  if (intern)
+    scm_intern_symbol (ob, name);
+  return scm_sym2ovcell_soft (name, ob);
+}
+
+
+/*
+ * 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 vcell;
+  SCM_VALIDATE_ENV (1, env);
+  SCM_VALIDATE_SYMBOL (2, name);
+  vcell = scm_sym2ovcell_soft (name, SCM_ENV_OBARRAY (env));
+  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_sym2ovcell_soft (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_sym2ovcell_soft (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, old;
+
+  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));
+
+  mod = scm_resolve_module (scm_read_0str ("(system base module)"));
+  old = scm_set_current_module (mod);
+
+#ifndef SCM_MAGIC_SNARFER
+#include "envs.x"
+#endif
+
+  load_env = scm_eval_closure_lookup (scm_standard_eval_closure (mod),
+				      scm_str2symbol ("load-env"),
+				      SCM_BOOL_T);
+  load_env = SCM_VARVCELL (load_env);
+
+  scm_set_current_module (old);
+}
+
+/*
+  Local Variables:
+  c-file-style: "gnu"
+  End:
+*/