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299 lines
8.8 KiB
C
299 lines
8.8 KiB
C
/* General queue data structure for GDB, the GNU debugger.
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Copyright (C) 2012-2017 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef QUEUE_H
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#define QUEUE_H
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/* These macros implement functions and structs for a general queue.
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Macro 'DEFINE_QUEUE_P(TYPEDEF)' is to define the new queue type for
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TYPEDEF', and macro 'DECLARE_QUEUE_P' is to declare external queue
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APIs. The character P indicates TYPEDEF is a pointer (P). The
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counterpart on object (O) and integer (I) are not implemented.
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An example of their use would be,
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typedef struct foo
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{} *foo_p;
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DEFINE_QUEUE_P (foo_p);
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// A pointer to a queue of foo pointers. FOO_XFREE is a destructor
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// function for foo instances in queue.
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QUEUE(foo_p) *foo_queue = QUEUE_alloc (foo_p, foo_xfree);
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foo_p foo_var_p;
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// Enqueue and Dequeue
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QUEUE_enque (foo_p, foo_queue, foo_var_p);
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foo_var_p = QUEUE_deque (foo_p, foo_queue);
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static int visit_foo (QUEUE (foo_p) *q, QUEUE_ITER (foo_p) *iter,
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foo_p f, void *data)
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{
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return 1;
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}
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// Iterate over queue.
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QUEUE_iterate (foo_p, foo_queue, visit_foo, ¶m);
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QUEUE_free (foo_p, foo_queue); // Free queue. */
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/* Typical enqueue operation. Put V into queue Q. */
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#define QUEUE_enque(TYPE, Q, V) queue_ ## TYPE ## _enque ((Q), (V))
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/* Typical dequeue operation. Return head element of queue Q and
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remove it. Q must not be empty. */
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#define QUEUE_deque(TYPE, Q) queue_ ## TYPE ## _deque (Q)
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/* Return the head element, but don't remove it from the queue.
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Q must not be empty. */
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#define QUEUE_peek(TYPE, Q) queue_ ## TYPE ## _peek (Q)
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/* Return true if queue Q is empty. */
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#define QUEUE_is_empty(TYPE, Q) queue_ ## TYPE ## _is_empty (Q)
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/* Allocate memory for queue. FREE_FUNC is a function to release the
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data put in each queue element. */
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#define QUEUE_alloc(TYPE, FREE_FUNC) queue_ ## TYPE ## _alloc (FREE_FUNC)
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/* Length of queue Q. */
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#define QUEUE_length(TYPE, Q) queue_ ## TYPE ## _length (Q)
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/* Free queue Q. Q's free_func is called once for each element. */
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#define QUEUE_free(TYPE, Q) queue_ ## TYPE ## _free (Q)
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/* Iterate over elements in the queue Q and call function OPERATE on
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each element. It is allowed to remove element by OPERATE. OPERATE
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returns false to terminate the iteration and true to continue the
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iteration. Return false if iteration is terminated by function
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OPERATE, otherwise return true. */
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#define QUEUE_iterate(TYPE, Q, OPERATE, PARAM) \
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queue_ ## TYPE ## _iterate ((Q), (OPERATE), (PARAM))
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/* Remove the element per the state of iterator ITER from queue Q.
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Leave the caller to release the data in the queue element. */
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#define QUEUE_remove_elem(TYPE, Q, ITER) \
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queue_ ## TYPE ## _remove_elem ((Q), (ITER))
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/* Define a new queue implementation. */
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#define QUEUE(TYPE) struct queue_ ## TYPE
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#define QUEUE_ELEM(TYPE) struct queue_elem_ ## TYPE
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#define QUEUE_ITER(TYPE) struct queue_iter_ ## TYPE
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#define QUEUE_ITER_FUNC(TYPE) queue_ ## TYPE ## _operate_func
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#define DEFINE_QUEUE_P(TYPE) \
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QUEUE_ELEM (TYPE) \
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{ \
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QUEUE_ELEM (TYPE) *next; \
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\
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TYPE data; \
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}; \
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\
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/* Queue iterator. */ \
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QUEUE_ITER (TYPE) \
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{ \
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/* The current element during traverse. */ \
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QUEUE_ELEM (TYPE) *p; \
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/* The previous element of P. */ \
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QUEUE_ELEM (TYPE) *prev; \
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}; \
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\
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QUEUE(TYPE) \
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{ \
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/* The head and tail of the queue. */ \
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QUEUE_ELEM (TYPE) *head; \
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QUEUE_ELEM (TYPE) *tail; \
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/* Function to release the data put in each \
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queue element. */ \
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void (*free_func) (TYPE); \
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}; \
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\
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void \
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queue_ ## TYPE ## _enque (QUEUE (TYPE) *q, TYPE v) \
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{ \
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QUEUE_ELEM (TYPE) *p = XNEW (QUEUE_ELEM (TYPE)); \
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\
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gdb_assert (q != NULL); \
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p->data = v; \
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p->next = NULL; \
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if (q->tail == NULL) \
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{ \
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q->tail = p; \
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q->head = p; \
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} \
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else \
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{ \
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q->tail->next = p; \
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q->tail = p; \
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} \
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} \
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\
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TYPE \
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queue_ ## TYPE ## _deque (QUEUE (TYPE) *q) \
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{ \
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QUEUE_ELEM (TYPE) *p; \
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TYPE v; \
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\
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gdb_assert (q != NULL); \
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p = q->head; \
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gdb_assert (p != NULL); \
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\
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if (q->head == q->tail) \
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{ \
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q->head = NULL; \
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q->tail = NULL; \
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} \
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else \
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q->head = q->head->next; \
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\
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v = p->data; \
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\
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xfree (p); \
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return v; \
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} \
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\
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TYPE \
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queue_ ## TYPE ## _peek (QUEUE (TYPE) *q) \
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{ \
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gdb_assert (q != NULL); \
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gdb_assert (q->head != NULL); \
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return q->head->data; \
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} \
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\
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int \
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queue_ ## TYPE ## _is_empty (QUEUE (TYPE) *q) \
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{ \
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gdb_assert (q != NULL); \
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return q->head == NULL; \
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} \
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\
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void \
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queue_ ## TYPE ## _remove_elem (QUEUE (TYPE) *q, \
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QUEUE_ITER (TYPE) *iter) \
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{ \
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gdb_assert (q != NULL); \
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gdb_assert (iter != NULL && iter->p != NULL); \
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\
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if (iter->p == q->head || iter->p == q->tail) \
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{ \
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if (iter->p == q->head) \
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q->head = iter->p->next; \
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if (iter->p == q->tail) \
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q->tail = iter->prev; \
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} \
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else \
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iter->prev->next = iter->p->next; \
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\
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xfree (iter->p); \
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/* Indicate that ITER->p has been deleted from QUEUE q. */ \
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iter->p = NULL; \
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} \
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\
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int \
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queue_ ## TYPE ## _iterate (QUEUE (TYPE) *q, \
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QUEUE_ITER_FUNC (TYPE) operate, \
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void *data) \
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{ \
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QUEUE_ELEM (TYPE) *next = NULL; \
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QUEUE_ITER (TYPE) iter = { NULL, NULL }; \
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\
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gdb_assert (q != NULL); \
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\
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for (iter.p = q->head; iter.p != NULL; iter.p = next) \
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{ \
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next = iter.p->next; \
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if (!operate (q, &iter, iter.p->data, data)) \
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return 0; \
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/* ITER.P was not deleted by function OPERATE. */ \
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if (iter.p != NULL) \
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iter.prev = iter.p; \
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} \
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return 1; \
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} \
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\
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QUEUE (TYPE) * \
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queue_ ## TYPE ## _alloc (void (*free_func) (TYPE)) \
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{ \
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QUEUE (TYPE) *q = XNEW (QUEUE (TYPE)); \
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\
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q->head = NULL; \
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q->tail = NULL; \
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q->free_func = free_func; \
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return q; \
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} \
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\
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int \
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queue_ ## TYPE ## _length (QUEUE (TYPE) *q) \
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{ \
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QUEUE_ELEM (TYPE) *p; \
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int len = 0; \
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\
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gdb_assert (q != NULL); \
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\
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for (p = q->head; p != NULL; p = p->next) \
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len++; \
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\
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return len; \
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} \
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\
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void \
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queue_ ## TYPE ## _free (QUEUE (TYPE) *q) \
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{ \
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QUEUE_ELEM (TYPE) *p, *next; \
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\
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gdb_assert (q != NULL); \
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\
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for (p = q->head; p != NULL; p = next) \
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{ \
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next = p->next; \
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if (q->free_func) \
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q->free_func (p->data); \
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xfree (p); \
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} \
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xfree (q); \
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} \
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/* External declarations for queue functions. */
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#define DECLARE_QUEUE_P(TYPE) \
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QUEUE (TYPE); \
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QUEUE_ELEM (TYPE); \
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QUEUE_ITER (TYPE); \
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extern void \
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queue_ ## TYPE ## _enque (QUEUE (TYPE) *q, TYPE v); \
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extern TYPE \
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queue_ ## TYPE ## _deque (QUEUE (TYPE) *q); \
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extern int queue_ ## TYPE ## _is_empty (QUEUE (TYPE) *q); \
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extern QUEUE (TYPE) * \
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queue_ ## TYPE ## _alloc (void (*free_func) (TYPE)); \
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extern int queue_ ## TYPE ## _length (QUEUE (TYPE) *q); \
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extern TYPE \
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queue_ ## TYPE ## _peek (QUEUE (TYPE) *q); \
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extern void queue_ ## TYPE ## _free (QUEUE (TYPE) *q); \
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typedef int QUEUE_ITER_FUNC(TYPE) (QUEUE (TYPE) *, \
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QUEUE_ITER (TYPE) *, \
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TYPE, \
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void *); \
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extern int \
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queue_ ## TYPE ## _iterate (QUEUE (TYPE) *q, \
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QUEUE_ITER_FUNC (TYPE) operate, \
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void *); \
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extern void \
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queue_ ## TYPE ## _remove_elem (QUEUE (TYPE) *q, \
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QUEUE_ITER (TYPE) *iter); \
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#endif /* QUEUE_H */
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