HEAPTEXT_BASE
(((uintptr_t)(addr) - HEAPTEXT_BASE) / \
((uintptr_t)(addr) >= HEAPTEXT_BASE + HEAPTEXT_SIZE - HEAPTEXT_OVERSIZE)
addr = HEAPTEXT_BASE;
(void *)(HEAPTEXT_BASE + HEAPTEXT_SIZE - HEAPTEXT_OVERSIZE),
base = HEAPTEXT_BASE +
#define MPOBUF_BASE (HEAPTEXT_BASE - MPOBUF_SIZE)