HEAP_PAGE_ALIGN_MASK  686 gc.c           #define GET_PAGE_BODY(x)   ((struct heap_page_body *)((bits_t)(x) & ~(HEAP_PAGE_ALIGN_MASK)))
HEAP_PAGE_ALIGN_MASK  690 gc.c           #define NUM_IN_PAGE(p)   (((bits_t)(p) & HEAP_PAGE_ALIGN_MASK)/sizeof(RVALUE))