BLUE 3TOO <blue_3...@hotmail.com> writes: > Can somebody quickly explain what the bit fields are for? thanks > > unsigned int precision : 10; > unsigned no_force_blk_flag : 1; > unsigned needs_constructing_flag : 1; > unsigned transparent_aggr_flag : 1; > unsigned restrict_flag : 1; > unsigned contains_placeholder_bits : 2; > ENUM_BITFIELD(machine_mode) mode : 8; > unsigned string_flag : 1; > unsigned lang_flag_0 : 1; > unsigned lang_flag_1 : 1; > unsigned lang_flag_2 : 1; > unsigned lang_flag_3 : 1; > unsigned lang_flag_4 : 1; > unsigned lang_flag_5 : 1; > unsigned lang_flag_6 : 1;
Look for the uses of the bitfields in the macros in tree.h, and look at the comments on those macros. Never refer to the fields directly; always use the macros. E.g., no_force_blk_flag is used in two macros, TYPE_NO_FORCE_BLK and TYPE_IS_SIZETYPE, and the comments explain when those macros are valid and what they mean. The lang_flag_N fields are used for frontend specific purposes, so for them you have to look at the individual frontends. Ian
