STACK_UPPER       588 cont.c             th->machine.stack_start = (void*)(((VALUE)ptr & RB_PAGE_MASK) + STACK_UPPER((void *)&ptr, 0, RB_PAGE_SIZE));
STACK_UPPER       177 eval.c         	ruby_init_stack(&errs[STACK_UPPER(errs, 0, 1)]);
STACK_UPPER      3916 gc.c               if (p) *p = STACK_UPPER(STACK_END, STACK_START, STACK_END);
STACK_UPPER        82 gc.h           #define STACK_DIR_UPPER(a,b) STACK_UPPER(0, (a), (b))
STACK_UPPER        85 gc.h           #define STACK_DIR_UPPER(a,b) STACK_UPPER(&stack_grow_dir_detection, (a), (b))
STACK_UPPER       760 thread_pthread.c         STACK_UPPER((VALUE *)(void *)&addr,