gdb

2009-05-27  Vladimir Prus  <vladimir@codesourcery.com>
	    Tom Tromey  <tromey@redhat.com>
	    Thiago Jung Bauermann  <bauerman@br.ibm.com>

	* mi/mi-main.c (mi_cmd_list_features): List "python" feature.
	* varobj.h (varobj_set_visualizer): Declare.
	(varobj_get_display_hint): Likewise.
	(varobj_update_result_t) <children_changed, value_installed>: New
	fields.
	* mi/mi-cmds.c (mi_cmds): Add var-set-visualizer.
	* mi/mi-cmds.h (mi_cmd_var_set_visualizer,
	mi_cmd_var_set_child_range): Declare.
	* mi/mi-cmd-var.c (mi_cmd_var_set_visualizer): New function.
	(mi_cmd_var_list_children): Emit display hint.
	(varobj_update_one): Emit display hint.  Handle dynamic children.
	* python/python.c (GdbMethods): Add "default_visualizer".
	* python/python-internal.h (apply_varobj_pretty_printer,
	gdbpy_get_varobj_pretty_printer, gdbpy_get_display_hint):
	Declare.
	(gdbpy_default_visualizer): Likewise.
	* varobj.c: Include python.h, python-internal.h.
	(PyObject): New typedef.
	(struct varobj) <children_requested, pretty_printer>: New fields.
	(varobj_create): Call install_default_visualizer.
	(instantiate_pretty_printer): New function.
	(varobj_set_display_format): Update.
	(varobj_get_display_hint): New function.
	(update_dynamic_varobj_children): New function.
	(varobj_get_num_children): Handle dynamic children.
	(varobj_list_children): Likewise.
	(install_new_value): Likewise.
	(varobj_add_child): New function.
	(install_visualizer): Likewise.
	(install_default_visualizer): Likewise.
	(varobj_set_visualizer): Likewise.
	(varobj_update): Handle dynamic children.
	(create_child): Use create_child_with_value.
	(create_child_with_value): New function.
	(value_get_print_value): Call pretty printer.  Add value_formatter
	argument.
	(c_value_of_variable): Update.
	(varobj_invalidate): Always free all_rootvarobj.
	* python/python-prettyprint.c (apply_varobj_pretty_printer): New
	function.
	(gdbpy_get_varobj_pretty_printer): Likewise.
	(gdbpy_default_visualizer): Likewise.

gdb/doc

2009-05-27  Tom Tromey  <tromey@redhat.com>

	* gdb.texinfo (GDB/MI Miscellaneous Commands): Document "python"
	feature.
	(GDB/MI Variable Objects): Document -var-set-visualizer.

gdb/testsuite

2009-05-27  Tom Tromey  <tromey@redhat.com>
	    Thiago Jung Bauermann  <bauerman@br.ibm.com>

	* lib/mi-support.exp (mi_varobj_update_dynamic): New proc.
	(mi_child_regexp): Likewise.
	(mi_list_varobj_children_range): Likewise.
	(mi_get_features): Likewise.
	(mi_list_varobj_children): Rewrite.
	* gdb.python/python-mi.exp: New file.

gdb/python/python-internal.h

@@ -111,6 +111,14 @@ char *python_string_to_host_string (PyObject *obj);
 PyObject *target_string_to_unicode (const gdb_byte *str, int length);
 int gdbpy_is_string (PyObject *obj);
 
+/* Note that these are declared here, and not in python.h with the
+   other pretty-printer functions, because they refer to PyObject.  */
+char *apply_varobj_pretty_printer (PyObject *print_obj,
+				   struct value **replacement);
+PyObject *gdbpy_get_varobj_pretty_printer (struct value *value);
+char *gdbpy_get_display_hint (PyObject *printer);
+PyObject *gdbpy_default_visualizer (PyObject *self, PyObject *args);
+
 extern PyObject *gdbpy_doc_cst;
 extern PyObject *gdbpy_children_cst;
 extern PyObject *gdbpy_to_string_cst;

gdb/python/python-prettyprint.c

@@ -508,6 +508,80 @@ apply_val_pretty_printer (struct type *type, const gdb_byte *valaddr,
   return result;
 }
 
+/* Apply a pretty-printer for the varobj code.  PRINTER_OBJ is the
+   print object.  It must have a 'to_string' method (but this is
+   checked by varobj, not here) which takes no arguments and
+   returns a string.  This function returns an xmalloc()d string if
+   the printer returns a string.  The printer may return a replacement
+   value instead; in this case *REPLACEMENT is set to the replacement
+   value, and this function returns NULL.  On error, *REPLACEMENT is
+   set to NULL and this function also returns NULL.  */
+char *
+apply_varobj_pretty_printer (PyObject *printer_obj,
+			     struct value **replacement)
+{
+  char *result;
+  PyGILState_STATE state = PyGILState_Ensure ();
+
+  *replacement = NULL;
+  result = pretty_print_one_value (printer_obj, replacement);
+  if (result == NULL);
+    gdbpy_print_stack ();
+  PyGILState_Release (state);
+
+  return result;
+}
+
+/* Find a pretty-printer object for the varobj module.  Returns a new
+   reference to the object if successful; returns NULL if not.  VALUE
+   is the value for which a printer tests to determine if it 
+   can pretty-print the value.  */
+PyObject *
+gdbpy_get_varobj_pretty_printer (struct value *value)
+{
+  PyObject *val_obj;
+  PyObject *pretty_printer = NULL;
+  volatile struct gdb_exception except;
+
+  TRY_CATCH (except, RETURN_MASK_ALL)
+    {
+      value = value_copy (value);
+    }
+  GDB_PY_HANDLE_EXCEPTION (except);
+  
+  val_obj = value_to_value_object (value);
+  if (! val_obj)
+    return NULL;
+
+  pretty_printer = find_pretty_printer (val_obj);
+  Py_DECREF (val_obj);
+  return pretty_printer;
+}
+
+/* A Python function which wraps find_pretty_printer and instantiates
+   the resulting class.  This accepts a Value argument and returns a
+   pretty printer instance, or None.  This function is useful as an
+   argument to the MI command -var-set-visualizer.  */
+PyObject *
+gdbpy_default_visualizer (PyObject *self, PyObject *args)
+{
+  PyObject *val_obj;
+  PyObject *cons, *printer = NULL;
+  struct value *value;
+
+  if (! PyArg_ParseTuple (args, "O", &val_obj))
+    return NULL;
+  value = value_object_to_value (val_obj);
+  if (! value)
+    {
+      PyErr_SetString (PyExc_TypeError, "argument must be a gdb.Value");
+      return NULL;
+    }
+
+  cons = find_pretty_printer (val_obj);
+  return cons;
+}
+
 #else /* HAVE_PYTHON */
 
 int

gdb/python/python.c

@@ -615,6 +615,9 @@ static PyMethodDef GdbMethods[] =
   { "get_parameter", get_parameter, METH_VARARGS,
     "Return a gdb parameter's value" },
 
+  { "default_visualizer", gdbpy_default_visualizer, METH_VARARGS,
+    "Find the default visualizer for a Value." },
+
   { "current_objfile", gdbpy_get_current_objfile, METH_NOARGS,
     "Return the current Objfile being loaded, or None." },
   { "objfiles", gdbpy_objfiles, METH_NOARGS,