1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
|
/* General queue data structure for GDB, the GNU debugger.
Copyright (C) 2012-2016 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef QUEUE_H
#define QUEUE_H
/* These macros implement functions and structs for a general queue.
Macro 'DEFINE_QUEUE_P(TYPEDEF)' is to define the new queue type for
TYPEDEF', and macro 'DECLARE_QUEUE_P' is to declare external queue
APIs. The character P indicates TYPEDEF is a pointer (P). The
counterpart on object (O) and integer (I) are not implemented.
An example of their use would be,
typedef struct foo
{} *foo_p;
DEFINE_QUEUE_P (foo_p);
// A pointer to a queue of foo pointers. FOO_XFREE is a destructor
// function for foo instances in queue.
QUEUE(foo_p) *foo_queue = QUEUE_alloc (foo_p, foo_xfree);
foo_p foo_var_p;
// Enqueue and Dequeue
QUEUE_enque (foo_p, foo_queue, foo_var_p);
foo_var_p = QUEUE_deque (foo_p, foo_queue);
static int visit_foo (QUEUE (foo_p) *q, QUEUE_ITER (foo_p) *iter,
foo_p f, void *data)
{
return 1;
}
// Iterate over queue.
QUEUE_iterate (foo_p, foo_queue, visit_foo, ¶m);
QUEUE_free (foo_p, foo_queue); // Free queue. */
/* Typical enqueue operation. Put V into queue Q. */
#define QUEUE_enque(TYPE, Q, V) queue_ ## TYPE ## _enque ((Q), (V))
/* Typical dequeue operation. Return head element of queue Q and
remove it. Q must not be empty. */
#define QUEUE_deque(TYPE, Q) queue_ ## TYPE ## _deque (Q)
/* Return the head element, but don't remove it from the queue.
Q must not be empty. */
#define QUEUE_peek(TYPE, Q) queue_ ## TYPE ## _peek (Q)
/* Return true if queue Q is empty. */
#define QUEUE_is_empty(TYPE, Q) queue_ ## TYPE ## _is_empty (Q)
/* Allocate memory for queue. FREE_FUNC is a function to release the
data put in each queue element. */
#define QUEUE_alloc(TYPE, FREE_FUNC) queue_ ## TYPE ## _alloc (FREE_FUNC)
/* Length of queue Q. */
#define QUEUE_length(TYPE, Q) queue_ ## TYPE ## _length (Q)
/* Free queue Q. Q's free_func is called once for each element. */
#define QUEUE_free(TYPE, Q) queue_ ## TYPE ## _free (Q)
/* Iterate over elements in the queue Q and call function OPERATE on
each element. It is allowed to remove element by OPERATE. OPERATE
returns false to terminate the iteration and true to continue the
iteration. Return false if iteration is terminated by function
OPERATE, otherwise return true. */
#define QUEUE_iterate(TYPE, Q, OPERATE, PARAM) \
queue_ ## TYPE ## _iterate ((Q), (OPERATE), (PARAM))
/* Remove the element per the state of iterator ITER from queue Q.
Leave the caller to release the data in the queue element. */
#define QUEUE_remove_elem(TYPE, Q, ITER) \
queue_ ## TYPE ## _remove_elem ((Q), (ITER))
/* Define a new queue implementation. */
#define QUEUE(TYPE) struct queue_ ## TYPE
#define QUEUE_ELEM(TYPE) struct queue_elem_ ## TYPE
#define QUEUE_ITER(TYPE) struct queue_iter_ ## TYPE
#define QUEUE_ITER_FUNC(TYPE) queue_ ## TYPE ## _operate_func
#define DEFINE_QUEUE_P(TYPE) \
QUEUE_ELEM (TYPE) \
{ \
QUEUE_ELEM (TYPE) *next; \
\
TYPE data; \
}; \
\
/* Queue iterator. */ \
QUEUE_ITER (TYPE) \
{ \
/* The current element during traverse. */ \
QUEUE_ELEM (TYPE) *p; \
/* The previous element of P. */ \
QUEUE_ELEM (TYPE) *prev; \
}; \
\
QUEUE(TYPE) \
{ \
/* The head and tail of the queue. */ \
QUEUE_ELEM (TYPE) *head; \
QUEUE_ELEM (TYPE) *tail; \
/* Function to release the data put in each \
queue element. */ \
void (*free_func) (TYPE); \
}; \
\
void \
queue_ ## TYPE ## _enque (QUEUE (TYPE) *q, TYPE v) \
{ \
QUEUE_ELEM (TYPE) *p = XNEW (QUEUE_ELEM (TYPE)); \
\
gdb_assert (q != NULL); \
p->data = v; \
p->next = NULL; \
if (q->tail == NULL) \
{ \
q->tail = p; \
q->head = p; \
} \
else \
{ \
q->tail->next = p; \
q->tail = p; \
} \
} \
\
TYPE \
queue_ ## TYPE ## _deque (QUEUE (TYPE) *q) \
{ \
QUEUE_ELEM (TYPE) *p; \
TYPE v; \
\
gdb_assert (q != NULL); \
p = q->head; \
gdb_assert (p != NULL); \
\
if (q->head == q->tail) \
{ \
q->head = NULL; \
q->tail = NULL; \
} \
else \
q->head = q->head->next; \
\
v = p->data; \
\
xfree (p); \
return v; \
} \
\
TYPE \
queue_ ## TYPE ## _peek (QUEUE (TYPE) *q) \
{ \
gdb_assert (q != NULL); \
gdb_assert (q->head != NULL); \
return q->head->data; \
} \
\
int \
queue_ ## TYPE ## _is_empty (QUEUE (TYPE) *q) \
{ \
gdb_assert (q != NULL); \
return q->head == NULL; \
} \
\
void \
queue_ ## TYPE ## _remove_elem (QUEUE (TYPE) *q, \
QUEUE_ITER (TYPE) *iter) \
{ \
gdb_assert (q != NULL); \
gdb_assert (iter != NULL && iter->p != NULL); \
\
if (iter->p == q->head || iter->p == q->tail) \
{ \
if (iter->p == q->head) \
q->head = iter->p->next; \
if (iter->p == q->tail) \
q->tail = iter->prev; \
} \
else \
iter->prev->next = iter->p->next; \
\
xfree (iter->p); \
/* Indicate that ITER->p has been deleted from QUEUE q. */ \
iter->p = NULL; \
} \
\
int \
queue_ ## TYPE ## _iterate (QUEUE (TYPE) *q, \
QUEUE_ITER_FUNC (TYPE) operate, \
void *data) \
{ \
QUEUE_ELEM (TYPE) *next = NULL; \
QUEUE_ITER (TYPE) iter = { NULL, NULL }; \
\
gdb_assert (q != NULL); \
\
for (iter.p = q->head; iter.p != NULL; iter.p = next) \
{ \
next = iter.p->next; \
if (!operate (q, &iter, iter.p->data, data)) \
return 0; \
/* ITER.P was not deleted by function OPERATE. */ \
if (iter.p != NULL) \
iter.prev = iter.p; \
} \
return 1; \
} \
\
QUEUE (TYPE) * \
queue_ ## TYPE ## _alloc (void (*free_func) (TYPE)) \
{ \
QUEUE (TYPE) *q = XNEW (QUEUE (TYPE)); \
\
q->head = NULL; \
q->tail = NULL; \
q->free_func = free_func; \
return q; \
} \
\
int \
queue_ ## TYPE ## _length (QUEUE (TYPE) *q) \
{ \
QUEUE_ELEM (TYPE) *p; \
int len = 0; \
\
gdb_assert (q != NULL); \
\
for (p = q->head; p != NULL; p = p->next) \
len++; \
\
return len; \
} \
\
void \
queue_ ## TYPE ## _free (QUEUE (TYPE) *q) \
{ \
QUEUE_ELEM (TYPE) *p, *next; \
\
gdb_assert (q != NULL); \
\
for (p = q->head; p != NULL; p = next) \
{ \
next = p->next; \
if (q->free_func) \
q->free_func (p->data); \
xfree (p); \
} \
xfree (q); \
} \
/* External declarations for queue functions. */
#define DECLARE_QUEUE_P(TYPE) \
QUEUE (TYPE); \
QUEUE_ELEM (TYPE); \
QUEUE_ITER (TYPE); \
extern void \
queue_ ## TYPE ## _enque (QUEUE (TYPE) *q, TYPE v); \
extern TYPE \
queue_ ## TYPE ## _deque (QUEUE (TYPE) *q); \
extern int queue_ ## TYPE ## _is_empty (QUEUE (TYPE) *q); \
extern QUEUE (TYPE) * \
queue_ ## TYPE ## _alloc (void (*free_func) (TYPE)); \
extern int queue_ ## TYPE ## _length (QUEUE (TYPE) *q); \
extern TYPE \
queue_ ## TYPE ## _peek (QUEUE (TYPE) *q); \
extern void queue_ ## TYPE ## _free (QUEUE (TYPE) *q); \
typedef int QUEUE_ITER_FUNC(TYPE) (QUEUE (TYPE) *, \
QUEUE_ITER (TYPE) *, \
TYPE, \
void *); \
extern int \
queue_ ## TYPE ## _iterate (QUEUE (TYPE) *q, \
QUEUE_ITER_FUNC (TYPE) operate, \
void *); \
extern void \
queue_ ## TYPE ## _remove_elem (QUEUE (TYPE) *q, \
QUEUE_ITER (TYPE) *iter); \
#endif /* QUEUE_H */
|
GitWeb