2007-02-13 Denis Pilat <denis.pilat@st.com>

2007-02-13  Denis Pilat  <denis.pilat@st.com>

	* varobj.h (enum varobj_update_error): New enum.
	* varobj.c (struct varobj_root): Add is_valid member.
	(varobj_get_type): Check for invalid varobj.
	(varobj_get_attributes): Likewise.
	(variable_editable):Likewise.
	(varobj_update): Likewise.  Use varobj_update_error.
	(new_root_variable): Set root varobj as valid by default.
	(varobj_invalidate): New function.
	* symfile.c (clear_symtab_users): Use varobj_invalidate.
	* mi/mi-cmd-var.c (varobj_update_one): Change return type to void.
	Use varobj_update_error.