diff options
Diffstat (limited to 'gcc/tree.h')
| -rw-r--r-- | gcc/tree.h | 40 |
1 files changed, 37 insertions, 3 deletions
@@ -1776,12 +1776,46 @@ extern tree build_qualified_type PARAMS ((tree, int)); extern tree build_type_copy PARAMS ((tree)); /* Given a ..._TYPE node, calculate the TYPE_SIZE, TYPE_SIZE_UNIT, - TYPE_ALIGN and TYPE_MODE fields. - If called more than once on one node, does nothing except - for the first time. */ + TYPE_ALIGN and TYPE_MODE fields. If called more than once on one + node, does nothing except for the first time. */ extern void layout_type PARAMS ((tree)); +/* These functions allow a front-end to perform a manual layout of a + RECORD_TYPE. (For instance, if the placement of subsequent fields + depends on the placement of fields so far.) Begin by calling + new_record_layout_info. Then, call layout_field for each of the + fields. Then, call finish_record_layout. See layout_type for the + default way in which these functions are used. */ + +struct record_layout_info_s +{ + /* The RECORD_TYPE that we are laying out. */ + tree t; + /* The size of the record so far, in bits. */ + unsigned HOST_WIDE_INT const_size; + /* The alignment of the record so far, in bits. */ + unsigned int record_align; + /* If the record can have a variable size, then this will be + non-NULL, and the total size will be CONST_SIZE + VAR_SIZE. */ + tree var_size; + /* If the record can have a variable size, then this will be the + maximum alignment that we know VAR_SIZE has. */ + unsigned int var_align; + /* The static variables (i.e., class variables, as opposed to + instance variables) encountered in T. */ + tree pending_statics; + unsigned int unpacked_align; + int packed_maybe_necessary; +}; + +typedef struct record_layout_info_s *record_layout_info; + +extern record_layout_info new_record_layout_info + PARAMS ((tree)); +extern void layout_field PARAMS ((record_layout_info, tree)); +extern void finish_record_layout PARAMS ((record_layout_info)); + /* Given a hashcode and a ..._TYPE node (for which the hashcode was made), return a canonicalized ..._TYPE node, so that duplicates are not made. How the hash code is computed is up to the caller, as long as any two |