+ /* This routine may be called during early unwinding, at a time
+ where the ID of FRAME is not yet known. Calling value_from_register
+ would therefore abort in get_frame_id. However, since we only need
+ a temporary value that is never used as lvalue, we actually do not
+ really need to set its VALUE_FRAME_ID. Therefore, we re-implement
+ the core of value_from_register, but use the null_frame_id. */
+
+ /* Some targets require a special conversion routine even for plain
+ pointer types. Avoid constructing a value object in those cases. */
+ if (gdbarch_convert_register_p (gdbarch, regnum, type))
+ {
+ gdb_byte *buf = alloca (TYPE_LENGTH (type));
+ int optim, unavail, ok;
+
+ ok = gdbarch_register_to_value (gdbarch, frame, regnum, type,
+ buf, &optim, &unavail);
+ if (!ok)
+ {
+ /* This function is used while computing a location expression.
+ Complain about the value being optimized out, rather than
+ letting value_as_address complain about some random register
+ the expression depends on not being saved. */
+ error_value_optimized_out ();
+ }
+
+ return unpack_long (type, buf);
+ }
+
+ value = gdbarch_value_from_register (gdbarch, type, regnum, null_frame_id);
+ read_frame_register_value (value, frame);
+
+ if (value_optimized_out (value))
+ {
+ /* This function is used while computing a location expression.
+ Complain about the value being optimized out, rather than
+ letting value_as_address complain about some random register
+ the expression depends on not being saved. */
+ error_value_optimized_out ();
+ }