ZEND_MM_TYPE_MASK  512 Zend/zend_alloc.c #define ZEND_MM_BLOCK_SIZE(b)			((b)->info._size & ~ZEND_MM_TYPE_MASK)
ZEND_MM_TYPE_MASK  515 Zend/zend_alloc.c #define ZEND_MM_IS_GUARD_BLOCK(b)		(((b)->info._size & ZEND_MM_TYPE_MASK) == ZEND_MM_GUARD_BLOCK)
ZEND_MM_TYPE_MASK  518 Zend/zend_alloc.c #define ZEND_MM_PREV_BLOCK(b)			ZEND_MM_BLOCK_AT(b, -(ssize_t)((b)->info._prev & ~ZEND_MM_TYPE_MASK))