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//===-- Macros defined in sys/queue.h header file -------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIBC_MACROS_SYS_QUEUE_MACROS_H
#define LLVM_LIBC_MACROS_SYS_QUEUE_MACROS_H
#include "containerof-macro.h"
#include "null-macro.h"
#ifdef __cplusplus
#define QUEUE_TYPEOF(type) type
#else
#define QUEUE_TYPEOF(type) struct type
#endif
// Singly-linked list definitions.
#define SLIST_HEAD(name, type) \
struct name { \
struct type *slh_first; \
}
#define SLIST_CLASS_HEAD(name, type) \
struct name { \
class type *slh_first; \
}
#define SLIST_HEAD_INITIALIZER(head) \
{ NULL }
#define SLIST_ENTRY(type) \
struct { \
struct type *next; \
}
#define SLIST_CLASS_ENTRY(type) \
struct { \
class type *next; \
}
// Singly-linked list access methods.
#define SLIST_EMPTY(head) ((head)->slh_first == NULL)
#define SLIST_FIRST(head) ((head)->slh_first)
#define SLIST_NEXT(elem, field) ((elem)->field.next)
#define SLIST_FOREACH(var, head, field) \
for ((var) = SLIST_FIRST(head); (var); (var) = SLIST_NEXT(var, field))
#define SLIST_FOREACH_FROM(var, head, field) \
if (!(var)) \
(var) = SLIST_FIRST(head); \
for (; (var); (var) = SLIST_NEXT(var, field))
#define SLIST_FOREACH_SAFE(var, head, field, tvar) \
for ((var) = SLIST_FIRST(head); \
(var) && ((tvar) = SLIST_NEXT(var, field), 1); (var) = (tvar))
#define SLIST_FOREACH_FROM_SAFE(var, head, field, tvar) \
if (!(var)) \
(var) = SLIST_FIRST(head); \
for (; (var) && ((tvar) = SLIST_NEXT(var, field), 1); (var) = (tvar))
// Singly-linked list functions.
#define SLIST_CONCAT(head1, head2, type, field) \
do { \
if (SLIST_EMPTY(head1)) { \
if ((SLIST_FIRST(head1) = SLIST_FIRST(head2)) != NULL) \
SLIST_INIT(head2); \
} else if (!SLIST_EMPTY(head2)) { \
QUEUE_TYPEOF(type) *cur = SLIST_FIRST(head1); \
while (SLIST_NEXT(cur, field) != NULL) \
cur = SLIST_NEXT(cur, field); \
SLIST_NEXT(cur, field) = SLIST_FIRST(head2); \
SLIST_INIT(head2); \
} \
} while (0)
#define SLIST_INIT(head) \
do { \
SLIST_FIRST(head) = NULL; \
} while (0)
#define SLIST_INSERT_AFTER(slistelem, elem, field) \
do { \
SLIST_NEXT(elem, field) = SLIST_NEXT(slistelem, field); \
SLIST_NEXT(slistelem, field) = (elem); \
} while (0)
#define SLIST_INSERT_HEAD(head, elem, field) \
do { \
SLIST_NEXT(elem, field) = SLIST_FIRST(head); \
SLIST_FIRST(head) = (elem); \
} while (0)
#define SLIST_REMOVE(head, elem, type, field) \
do { \
if (SLIST_FIRST(head) == (elem)) { \
SLIST_REMOVE_HEAD(head, field); \
} else { \
QUEUE_TYPEOF(type) *cur = SLIST_FIRST(head); \
while (SLIST_NEXT(cur, field) != (elem)) \
cur = SLIST_NEXT(cur, field); \
SLIST_REMOVE_AFTER(cur, field); \
} \
} while (0)
#define SLIST_REMOVE_AFTER(elem, field) \
do { \
SLIST_NEXT(elem, field) = SLIST_NEXT(SLIST_NEXT(elem, field), field); \
} while (0)
#define SLIST_REMOVE_HEAD(head, field) \
do { \
SLIST_FIRST(head) = SLIST_NEXT(SLIST_FIRST(head), field); \
} while (0)
#define SLIST_SWAP(head1, head2, type) \
do { \
QUEUE_TYPEOF(type) *first = SLIST_FIRST(head1); \
SLIST_FIRST(head1) = SLIST_FIRST(head2); \
SLIST_FIRST(head2) = first; \
} while (0)
// Singly-linked tail queue definitions.
#define STAILQ_HEAD(name, type) \
struct name { \
struct type *stqh_first; \
struct type **stqh_last; \
}
#define STAILQ_CLASS_HEAD(name, type) \
struct name { \
class type *stqh_first; \
class type **stqh_last; \
}
#define STAILQ_HEAD_INITIALIZER(head) \
{ NULL, &(head).stqh_first }
#define STAILQ_ENTRY(type) \
struct { \
struct type *next; \
}
#define STAILQ_CLASS_ENTRY(type) \
struct { \
class type *next; \
}
// Singly-linked tail queue access methods.
#define STAILQ_EMPTY(head) ((head)->stqh_first == NULL)
#define STAILQ_FIRST(head) ((head)->stqh_first)
#define STAILQ_LAST(head, type, field) \
(STAILQ_EMPTY(head) \
? NULL \
: __containerof((head)->stqh_last, QUEUE_TYPEOF(type), field.next))
#define STAILQ_NEXT(elem, field) ((elem)->field.next)
#define STAILQ_FOREACH(var, head, field) \
for ((var) = STAILQ_FIRST(head); (var); (var) = STAILQ_NEXT(var, field))
#define STAILQ_FOREACH_FROM(var, head, field) \
if (!(var)) \
(var) = STAILQ_FIRST(head); \
for (; (var); (var) = STAILQ_NEXT(var, field))
#define STAILQ_FOREACH_SAFE(var, head, field, tvar) \
for ((var) = STAILQ_FIRST(head); \
(var) && ((tvar) = STAILQ_NEXT(var, field), 1); (var) = (tvar))
#define STAILQ_FOREACH_FROM_SAFE(var, head, field, tvar) \
if (!(var)) \
(var) = STAILQ_FIRST(head); \
for (; (var) && ((tvar) = STAILQ_NEXT(var, field), 1); (var) = (tvar))
// Singly-linked tail queue functions.
#define STAILQ_CONCAT(head1, head2, type, field) \
do { \
if (!STAILQ_EMPTY(head2)) { \
*(head1)->stqh_last = (head2)->stqh_first; \
(head1)->stqh_last = (head2)->stqh_last; \
STAILQ_INIT(head2); \
} \
} while (0)
#define STAILQ_INIT(head) \
do { \
STAILQ_FIRST(head) = NULL; \
(head)->stqh_last = &STAILQ_FIRST(head); \
} while (0)
#define STAILQ_INSERT_AFTER(head, listelem, elem, field) \
do { \
if ((STAILQ_NEXT(elem, field) = STAILQ_NEXT(listelem, field)) == NULL) \
(head)->stqh_last = &STAILQ_NEXT(elem, field); \
STAILQ_NEXT(listelem, field) = (elem); \
} while (0)
#define STAILQ_INSERT_HEAD(head, elem, field) \
do { \
if ((STAILQ_NEXT(elem, field) = STAILQ_FIRST(head)) == NULL) \
(head)->stqh_last = &STAILQ_NEXT(elem, field); \
STAILQ_FIRST(head) = (elem); \
} while (0)
#define STAILQ_INSERT_TAIL(head, elem, field) \
do { \
STAILQ_NEXT(elem, field) = NULL; \
*(head)->stqh_last = (elem); \
(head)->stqh_last = &STAILQ_NEXT(elem, field); \
} while (0)
#define STAILQ_REMOVE(head, elem, type, field) \
do { \
if (STAILQ_FIRST(head) == (elem)) { \
STAILQ_REMOVE_HEAD(head, field); \
} else { \
QUEUE_TYPEOF(type) *cur = STAILQ_FIRST(head); \
while (STAILQ_NEXT(cur, field) != (elem)) \
cur = STAILQ_NEXT(cur, field); \
STAILQ_REMOVE_AFTER(head, cur, field); \
} \
} while (0)
#define STAILQ_REMOVE_AFTER(head, elem, field) \
do { \
if ((STAILQ_NEXT(elem, field) = \
STAILQ_NEXT(STAILQ_NEXT(elem, field), field)) == NULL) \
(head)->stqh_last = &STAILQ_NEXT(elem, field); \
} while (0)
#define STAILQ_REMOVE_HEAD(head, field) \
do { \
if ((STAILQ_FIRST(head) = STAILQ_NEXT(STAILQ_FIRST(head), field)) == NULL) \
(head)->stqh_last = &STAILQ_FIRST(head); \
} while (0)
#define STAILQ_SWAP(head1, head2, type) \
do { \
QUEUE_TYPEOF(type) *first = STAILQ_FIRST(head1); \
QUEUE_TYPEOF(type) **last = (head1)->stqh_last; \
STAILQ_FIRST(head1) = STAILQ_FIRST(head2); \
(head1)->stqh_last = (head2)->stqh_last; \
STAILQ_FIRST(head2) = first; \
(head2)->stqh_last = last; \
if (STAILQ_EMPTY(head1)) \
(head1)->stqh_last = &STAILQ_FIRST(head1); \
if (STAILQ_EMPTY(head2)) \
(head2)->stqh_last = &STAILQ_FIRST(head2); \
} while (0)
#endif // LLVM_LIBC_MACROS_SYS_QUEUE_MACROS_H
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