+/* Given a pointer, return the size of its target.
+ If the pointer type is void *, then return 1.
+ If the target type is incomplete, then error out.
+ This isn't a general purpose function, but just a
+ helper for value_sub & value_add.
+*/
+
+static LONGEST
+find_size_for_pointer_math (struct type *ptr_type)
+{
+ LONGEST sz = -1;
+ struct type *ptr_target;
+
+ ptr_target = check_typedef (TYPE_TARGET_TYPE (ptr_type));
+
+ sz = TYPE_LENGTH (ptr_target);
+ if (sz == 0)
+ {
+ if (TYPE_CODE (ptr_type) == TYPE_CODE_VOID)
+ sz = 1;
+ else
+ {
+ char *name;
+
+ name = TYPE_NAME (ptr_target);
+ if (name == NULL)
+ name = TYPE_TAG_NAME (ptr_target);
+ if (name == NULL)
+ error ("Cannot perform pointer math on incomplete types, "
+ "try casting to a known type, or void *.");
+ else
+ error ("Cannot perform pointer math on incomplete type \"%s\", "
+ "try casting to a known type, or void *.", name);
+ }
+ }
+ return sz;
+}
+
+struct value *
+value_add (struct value *arg1, struct value *arg2)