Changes towards better type safety regarding intervals, primarily
regarding the "parent" handle. These just separate out the different usages based on the type of parent (interval vs lisp object); later changes will do type checking and enforcement. * intervals.h (NULL_INTERVAL): Cast to INTERVAL type. (INT_LISPLIKE): New macro. (NULL_INTERVAL_P): Use it. (INTERVAL_HAS_PARENT, INTERVAL_HAS_OBJECT, SET_INTERVAL_PARENT, SET_INTERVAL_OBJECT, INTERVAL_PARENT, COPY_INTERVAL_PARENT, GET_INTERVAL_OBJECT, INTERVAL_PARENT_OR_NULL): New macros. * alloc.c (make_interval, gc_sweep): Use new macros; eliminate all explicit references to "parent" field of struct interval and associated unclean type conversions. * intervals.c (create_root_interval, root_interval, rotate_right, rotate_left, balance_possible_root_interval, split_interval_right, split_interval_left, interval_start_pos, find_interval, next_interval, previous_interval, update_interval, adjust_intervals_for_insertion, delete_node, delete_interval, adjust_intervals_for_deletion, merge_interval_right, merge_interval_left, reproduce_tree, graft_intervals_into_buffer, copy_intervals_to_string): Likewise. * intervals.h (AM_LEFT_CHILD, AM_RIGHT_CHILD, RESET_INTERVAL): Likewise. * syntax.c (update_syntax_table): Likewise. * intervals.c (reproduce_tree_obj): New function, like reproduce_tree but takes a Lisp_Object for the parent. Declare with prototype. (graft_intervals_into_buffer): Use it when appropriate. (reproduce_tree): Declare with prototype. (balance_possible_root_interval): Check that the parent is a lisp object before trying to examine its type.
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