* mi/mi-main.c: Include python-internal.h.

(mi_cmd_list_features): Check gdb_python_initialized.
	* python/py-inferior.c (python_on_normal_stop, python_on_resume)
	(python_inferior_exit, python_new_objfile, add_thread_object)
	(delete_thread_object, py_free_inferior): Check
	gdb_python_initialized.
	* python/py-prettyprint.c (apply_val_pretty_printer): Check
	gdb_python_initialized.
	* python/py-type.c (save_objfile_types): Check
	gdb_python_initialized.
	* python/python-internal.h (gdb_python_initialized): Declare.
	* python/python.c (ensure_python_env): Throw exception if
	Python not initialized.
	(before_prompt_hook, source_python_script_for_objfile)
	(start_type_printers, apply_type_printers,
	free_type_printers): Check gdb_python_initialized.
	* varobj.c (varobj_get_display_hint)
	(dynamic_varobj_has_child_method, update_dynamic_varobj_children)
	(install_new_value_visualizer, varobj_set_visualizer)
	(value_get_print_value): Check gdb_python_initialized.

gdb/python/py-inferior.c

@@ -85,6 +85,9 @@ python_on_normal_stop (struct bpstats *bs, int print_frame)
   struct cleanup *cleanup;
   enum gdb_signal stop_signal;
 
+  if (!gdb_python_initialized)
+    return;
+
   if (!find_thread_ptid (inferior_ptid))
       return;
 
@@ -103,6 +106,9 @@ python_on_resume (ptid_t ptid)
 {
   struct cleanup *cleanup;
 
+  if (!gdb_python_initialized)
+    return;
+
   cleanup = ensure_python_env (target_gdbarch (), current_language);
 
   if (emit_continue_event (ptid) < 0)
@@ -117,6 +123,9 @@ python_inferior_exit (struct inferior *inf)
   struct cleanup *cleanup;
   const LONGEST *exit_code = NULL;
 
+  if (!gdb_python_initialized)
+    return;
+
   cleanup = ensure_python_env (target_gdbarch (), current_language);
 
   if (inf->has_exit_code)
@@ -139,6 +148,9 @@ python_new_objfile (struct objfile *objfile)
   if (objfile == NULL)
     return;
 
+  if (!gdb_python_initialized)
+    return;
+
   cleanup = ensure_python_env (get_objfile_arch (objfile), current_language);
 
   if (emit_new_objfile_event (objfile) < 0)
@@ -231,6 +243,9 @@ add_thread_object (struct thread_info *tp)
   inferior_object *inf_obj;
   struct threadlist_entry *entry;
 
+  if (!gdb_python_initialized)
+    return;
+
   cleanup = ensure_python_env (python_gdbarch, python_language);
 
   thread_obj = create_thread_object (tp);
@@ -260,6 +275,9 @@ delete_thread_object (struct thread_info *tp, int ignore)
   inferior_object *inf_obj;
   struct threadlist_entry **entry, *tmp;
   
+  if (!gdb_python_initialized)
+    return;
+
   cleanup = ensure_python_env (python_gdbarch, python_language);
 
   inf_obj = (inferior_object *) find_inferior_object (PIDGET(tp->ptid));
@@ -726,6 +744,9 @@ py_free_inferior (struct inferior *inf, void *datum)
   inferior_object *inf_obj = datum;
   struct threadlist_entry *th_entry, *th_tmp;
 
+  if (!gdb_python_initialized)
+    return;
+
   cleanup = ensure_python_env (python_gdbarch, python_language);
 
   inf_obj->inferior = NULL;

gdb/python/py-prettyprint.c

@@ -708,6 +708,9 @@ apply_val_pretty_printer (struct type *type, const gdb_byte *valaddr,
   if (!value_bytes_available (val, embedded_offset, TYPE_LENGTH (type)))
     return 0;
 
+  if (!gdb_python_initialized)
+    return 0;
+
   cleanups = ensure_python_env (gdbarch, language);
 
   /* Instantiate the printer.  */

gdb/python/py-type.c

@@ -1192,6 +1192,9 @@ save_objfile_types (struct objfile *objfile, void *datum)
   htab_t copied_types;
   struct cleanup *cleanup;
 
+  if (!gdb_python_initialized)
+    return;
+
   /* This prevents another thread from freeing the objects we're
      operating on.  */
   cleanup = ensure_python_env (get_objfile_arch (objfile), current_language);

gdb/python/python-internal.h

@@ -189,6 +189,8 @@ struct program_space;
 struct bpstats;
 struct inferior;
 
+extern int gdb_python_initialized;
+
 extern PyObject *gdb_module;
 extern PyObject *gdb_python_module;
 extern PyTypeObject value_object_type

gdb/python/python.c

@@ -150,6 +150,10 @@ ensure_python_env (struct gdbarch *gdbarch,
 {
   struct python_env *env = xmalloc (sizeof *env);
 
+  /* We should not ever enter Python unless initialized.  */
+  if (!gdb_python_initialized)
+    error (_("Python not initialized"));
+
   env->state = PyGILState_Ensure ();
   env->gdbarch = python_gdbarch;
   env->language = python_language;
@@ -896,6 +900,9 @@ before_prompt_hook (const char *current_gdb_prompt)
   struct cleanup *cleanup;
   char *prompt = NULL;
 
+  if (!gdb_python_initialized)
+    return;
+
   cleanup = ensure_python_env (get_current_arch (), current_language);
 
   if (gdb_python_module
@@ -1159,6 +1166,9 @@ source_python_script_for_objfile (struct objfile *objfile, FILE *file,
 {
   struct cleanup *cleanups;
 
+  if (!gdb_python_initialized)
+    return;
+
   cleanups = ensure_python_env (get_objfile_arch (objfile), current_language);
   gdbpy_current_objfile = objfile;
 
@@ -1220,6 +1230,9 @@ start_type_printers (void)
   struct cleanup *cleanups;
   PyObject *type_module, *func, *result_obj = NULL;
 
+  if (!gdb_python_initialized)
+    return NULL;
+
   cleanups = ensure_python_env (get_current_arch (), current_language);
 
   type_module = PyImport_ImportModule ("gdb.types");
@@ -1266,6 +1279,9 @@ apply_type_printers (void *printers, struct type *type)
   if (printers_obj == NULL)
     return NULL;
 
+  if (!gdb_python_initialized)
+    return NULL;
+
   cleanups = ensure_python_env (get_current_arch (), current_language);
 
   type_obj = type_to_type_object (type);
@@ -1324,6 +1340,9 @@ free_type_printers (void *arg)
   if (printers == NULL)
     return;
 
+  if (!gdb_python_initialized)
+    return;
+
   cleanups = ensure_python_env (get_current_arch (), current_language);
   Py_DECREF (printers);
   do_cleanups (cleanups);