+/* Return true if the INDEXth field of TYPE is a virtual baseclass
+ pointer which is for the base class whose type is BASECLASS. */
+
+static int
+vb_match (struct type *type, int index, struct type *basetype)
+{
+ struct type *fieldtype;
+ const char *name = TYPE_FIELD_NAME (type, index);
+ const char *field_class_name = NULL;
+
+ if (*name != '_')
+ return 0;
+ /* gcc 2.4 uses _vb$. */
+ if (name[1] == 'v' && name[2] == 'b' && is_cplus_marker (name[3]))
+ field_class_name = name + 4;
+ /* gcc 2.5 will use __vb_. */
+ if (name[1] == '_' && name[2] == 'v' && name[3] == 'b' && name[4] == '_')
+ field_class_name = name + 5;
+
+ if (field_class_name == NULL)
+ /* This field is not a virtual base class pointer. */
+ return 0;
+
+ /* It's a virtual baseclass pointer, now we just need to find out whether
+ it is for this baseclass. */
+ fieldtype = TYPE_FIELD_TYPE (type, index);
+ if (fieldtype == NULL
+ || TYPE_CODE (fieldtype) != TYPE_CODE_PTR)
+ /* "Can't happen". */
+ return 0;
+
+ /* What we check for is that either the types are equal (needed for
+ nameless types) or have the same name. This is ugly, and a more
+ elegant solution should be devised (which would probably just push
+ the ugliness into symbol reading unless we change the stabs format). */
+ if (TYPE_TARGET_TYPE (fieldtype) == basetype)
+ return 1;
+
+ if (TYPE_NAME (basetype) != NULL
+ && TYPE_NAME (TYPE_TARGET_TYPE (fieldtype)) != NULL
+ && strcmp (TYPE_NAME (basetype),
+ TYPE_NAME (TYPE_TARGET_TYPE (fieldtype))) == 0)
+ return 1;
+ return 0;
+}
+
+/* Compute the offset of the baseclass which is the INDEXth baseclass
+ of class TYPE, for value at VALADDR (in host) at ADDRESS (in
+ target). The result is the offset of the baseclass value relative
+ to (the address of)(ARG) + OFFSET. */
+
+static int
+gnuv2_baseclass_offset (struct type *type, int index,
+ const bfd_byte *valaddr, LONGEST embedded_offset,
+ CORE_ADDR address, const struct value *val)
+{
+ struct type *basetype = TYPE_BASECLASS (type, index);
+
+ if (BASETYPE_VIA_VIRTUAL (type, index))
+ {
+ /* Must hunt for the pointer to this virtual baseclass. */
+ int i, len = TYPE_NFIELDS (type);
+ int n_baseclasses = TYPE_N_BASECLASSES (type);
+
+ /* First look for the virtual baseclass pointer
+ in the fields. */
+ for (i = n_baseclasses; i < len; i++)
+ {
+ if (vb_match (type, i, basetype))
+ {
+ struct type *field_type;
+ LONGEST field_offset;
+ int field_length;
+ CORE_ADDR addr;
+
+ field_type = check_typedef (TYPE_FIELD_TYPE (type, i));
+ field_offset = TYPE_FIELD_BITPOS (type, i) / 8;
+ field_length = TYPE_LENGTH (field_type);
+
+ if (!value_bytes_available (val, embedded_offset + field_offset,
+ field_length))
+ throw_error (NOT_AVAILABLE_ERROR,
+ _("Virtual baseclass pointer is not available"));
+
+ addr = unpack_pointer (field_type,
+ valaddr + embedded_offset + field_offset);
+
+ return addr - (LONGEST) address + embedded_offset;
+ }
+ }
+ /* Not in the fields, so try looking through the baseclasses. */
+ for (i = index + 1; i < n_baseclasses; i++)
+ {
+ /* Don't go through baseclass_offset, as that wraps
+ exceptions, thus, inner exceptions would be wrapped more
+ than once. */
+ int boffset =
+ gnuv2_baseclass_offset (type, i, valaddr,
+ embedded_offset, address, val);
+
+ if (boffset)
+ return boffset;
+ }
+
+ error (_("Baseclass offset not found"));
+ }
+
+ /* Baseclass is easily computed. */
+ return TYPE_BASECLASS_BITPOS (type, index) / 8;
+}