#define __MISMATCH_TAGS_POP
#endif
+/*!
+ * Ensures that these macros can safely be used in structs when compiling with
+ * clang. The macros do not allow for nullability attributes to be specified due
+ * to how they are expanded. For example:
+ *
+ * SLIST_HEAD(, foo _Nullable) bar;
+ *
+ * expands to
+ *
+ * struct {
+ * struct foo _Nullable *slh_first;
+ * }
+ *
+ * which is not valid because the nullability specifier has to apply to the
+ * pointer. So just ignore nullability completeness in all the places where this
+ * is an issue.
+ */
+#if defined(__clang__)
+#define __NULLABILITY_COMPLETENESS_PUSH \
+ _Pragma("clang diagnostic push") \
+ _Pragma("clang diagnostic ignored \"-Wnullability-completeness\"")
+#define __NULLABILITY_COMPLETENESS_POP \
+ _Pragma("clang diagnostic pop")
+#else
+#define __NULLABILITY_COMPLETENESS_PUSH
+#define __NULLABILITY_COMPLETENESS_POP
+#endif
+
/*
* Singly-linked List declarations.
*/
#define SLIST_HEAD(name, type) \
__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
struct name { \
struct type *slh_first; /* first element */ \
} \
+__NULLABILITY_COMPLETENESS_POP \
__MISMATCH_TAGS_POP
#define SLIST_HEAD_INITIALIZER(head) \
#define SLIST_ENTRY(type) \
__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
struct { \
struct type *sle_next; /* next element */ \
} \
+__NULLABILITY_COMPLETENESS_POP \
__MISMATCH_TAGS_POP
/*
#define SLIST_REMOVE(head, elm, type, field) \
__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
do { \
if (SLIST_FIRST((head)) == (elm)) { \
SLIST_REMOVE_HEAD((head), field); \
} \
TRASHIT((elm)->field.sle_next); \
} while (0) \
+__NULLABILITY_COMPLETENESS_POP \
__MISMATCH_TAGS_POP
#define SLIST_REMOVE_AFTER(elm, field) do { \
*/
#define STAILQ_HEAD(name, type) \
__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
struct name { \
struct type *stqh_first;/* first element */ \
struct type **stqh_last;/* addr of last next element */ \
} \
+__NULLABILITY_COMPLETENESS_POP \
__MISMATCH_TAGS_POP
#define STAILQ_HEAD_INITIALIZER(head) \
#define STAILQ_ENTRY(type) \
__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
struct { \
struct type *stqe_next; /* next element */ \
} \
+__NULLABILITY_COMPLETENESS_POP \
__MISMATCH_TAGS_POP
/*
#define STAILQ_LAST(head, type, field) \
__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
(STAILQ_EMPTY((head)) ? \
NULL : \
((struct type *)(void *) \
((char *)((head)->stqh_last) - __offsetof(struct type, field))))\
+__NULLABILITY_COMPLETENESS_POP \
__MISMATCH_TAGS_POP
#define STAILQ_NEXT(elm, field) ((elm)->field.stqe_next)
#define STAILQ_REMOVE(head, elm, type, field) \
__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
do { \
if (STAILQ_FIRST((head)) == (elm)) { \
STAILQ_REMOVE_HEAD((head), field); \
} \
TRASHIT((elm)->field.stqe_next); \
} while (0) \
+__NULLABILITY_COMPLETENESS_POP \
__MISMATCH_TAGS_POP
#define STAILQ_REMOVE_HEAD(head, field) do { \
#define STAILQ_SWAP(head1, head2, type) \
__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
do { \
struct type *swap_first = STAILQ_FIRST(head1); \
struct type **swap_last = (head1)->stqh_last; \
if (STAILQ_EMPTY(head2)) \
(head2)->stqh_last = &STAILQ_FIRST(head2); \
} while (0) \
+__NULLABILITY_COMPLETENESS_POP \
__MISMATCH_TAGS_POP
*/
#define LIST_HEAD(name, type) \
__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
struct name { \
struct type *lh_first; /* first element */ \
} \
+__NULLABILITY_COMPLETENESS_POP \
__MISMATCH_TAGS_POP
#define LIST_HEAD_INITIALIZER(head) \
#define LIST_ENTRY(type) \
__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
struct { \
struct type *le_next; /* next element */ \
struct type **le_prev; /* address of previous next element */ \
} \
+__NULLABILITY_COMPLETENESS_POP \
__MISMATCH_TAGS_POP
/*
#define LIST_SWAP(head1, head2, type, field) \
__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
do { \
struct type *swap_tmp = LIST_FIRST((head1)); \
LIST_FIRST((head1)) = LIST_FIRST((head2)); \
if ((swap_tmp = LIST_FIRST((head2))) != NULL) \
swap_tmp->field.le_prev = &LIST_FIRST((head2)); \
} while (0) \
+__NULLABILITY_COMPLETENESS_POP \
__MISMATCH_TAGS_POP
/*
*/
#define TAILQ_HEAD(name, type) \
__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
struct name { \
struct type *tqh_first; /* first element */ \
struct type **tqh_last; /* addr of last next element */ \
TRACEBUF \
} \
+__NULLABILITY_COMPLETENESS_POP \
__MISMATCH_TAGS_POP
#define TAILQ_HEAD_INITIALIZER(head) \
#define TAILQ_ENTRY(type) \
__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
struct { \
struct type *tqe_next; /* next element */ \
struct type **tqe_prev; /* address of previous next element */ \
TRACEBUF \
} \
+__NULLABILITY_COMPLETENESS_POP \
__MISMATCH_TAGS_POP
/*
(var) && ((tvar) = TAILQ_PREV((var), headname, field), 1); \
(var) = (tvar))
+#if XNU_KERNEL_PRIVATE
+/*
+ * Can be used when the initialized HEAD was just bzeroed
+ * Works around deficiencies in clang analysis of initialization patterns.
+ * See: <rdar://problem/47939050>
+ */
+#define TAILQ_INIT_AFTER_BZERO(head) do { \
+ (head)->tqh_last = &TAILQ_FIRST((head)); \
+} while (0)
+#endif /* XNU_KERNEL_PRIVATE */
+
#define TAILQ_INIT(head) do { \
TAILQ_FIRST((head)) = NULL; \
(head)->tqh_last = &TAILQ_FIRST((head)); \
#define TAILQ_LAST(head, headname) \
__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
(*(((struct headname *)((head)->tqh_last))->tqh_last)) \
+__NULLABILITY_COMPLETENESS_POP \
__MISMATCH_TAGS_POP
#define TAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
#define TAILQ_PREV(elm, headname, field) \
__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
(*(((struct headname *)((elm)->field.tqe_prev))->tqh_last)) \
+__NULLABILITY_COMPLETENESS_POP \
__MISMATCH_TAGS_POP
#define TAILQ_REMOVE(head, elm, field) do { \
*/
#define TAILQ_SWAP(head1, head2, type, field) \
__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
do { \
struct type *swap_first = (head1)->tqh_first; \
struct type **swap_last = (head1)->tqh_last; \
else \
(head2)->tqh_last = &(head2)->tqh_first; \
} while (0) \
+__NULLABILITY_COMPLETENESS_POP \
__MISMATCH_TAGS_POP
/*
*/
#define CIRCLEQ_HEAD(name, type) \
__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
struct name { \
struct type *cqh_first; /* first element */ \
struct type *cqh_last; /* last element */ \
} \
+__NULLABILITY_COMPLETENESS_POP \
__MISMATCH_TAGS_POP
#define CIRCLEQ_ENTRY(type) \
__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
struct { \
struct type *cqe_next; /* next element */ \
struct type *cqe_prev; /* previous element */ \
} \
+__NULLABILITY_COMPLETENESS_POP \
__MISMATCH_TAGS_POP
/*
projects / apple / xnu.git / blobdiff