Stop assuming interval pointers and lisp objects can be distinguished by
inspection. Beginnings of support for expensive internal consistency checks. * config.in (ENABLE_CHECKING): Undef. * lisp.h (struct interval): Replace "parent" field with a union of interval pointer and Lisp_Object; add new bitfield to use as discriminant. Change other flag fields to bitfields. (CHECK): New macro for consistency checking. If ENABLE_CHECKING is defined and the supplied test fails, print a message and abort. (eassert): New macro. Use CHECK to provide an assert-like facility. * intervals.h (NULL_INTERVAL_P): Now applies only to real interval pointers; abort if the value looks like a lisp object. (NULL_INTERVAL_P, NULL_PARENT, HAS_PARENT, HAS_OBJECT, SET_PARENT, SET_OBJECT, INTERVAL_PARENT, GET_INTERVAL_OBJECT, COPY_PARENT): Modify for new interval parent definition. * alloc.c (mark_interval_tree, MARK_INTERVAL_TREE, UNMARK_BALANCE_INTERVALS): Update references that need an addressable lisp object in the interval structure. (die): New function. (suppress_checking): New variable. * intervals.c (interval_start_pos): Just return 0 if there's no parent object.
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