aboutsummaryrefslogtreecommitdiff
path: root/gdb/thread-iter.h
blob: be6ab73c6863a092c06d6ecb727d7c6d15442545 (plain)
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
/* Thread iterators and ranges for GDB, the GNU debugger.
   Copyright (C) 2018-2019 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 THREAD_ITER_H
#define THREAD_ITER_H

#include "common/filtered-iterator.h"
#include "common/next-iterator.h"
#include "common/safe-iterator.h"

/* A forward iterator that iterates over a given inferior's
   threads.  */

using inf_threads_iterator = next_iterator<thread_info>;

/* A forward iterator that iterates over all threads of all
   inferiors.  */

class all_threads_iterator
{
public:
  typedef all_threads_iterator self_type;
  typedef struct thread_info *value_type;
  typedef struct thread_info *&reference;
  typedef struct thread_info **pointer;
  typedef std::forward_iterator_tag iterator_category;
  typedef int difference_type;

  /* Tag type.  */
  struct begin_t {};

  /* Create an iterator that points to the first thread of the first
     inferior.  */
  explicit all_threads_iterator (begin_t);

  /* Create a one-past-end iterator.  */
  all_threads_iterator ()
    : m_thr (nullptr)
  {}

  thread_info *operator* () const { return m_thr; }

  all_threads_iterator &operator++ ()
  {
    advance ();
    return *this;
  }

  bool operator== (const all_threads_iterator &other) const
  { return m_thr == other.m_thr; }

  bool operator!= (const all_threads_iterator &other) const
  { return m_thr != other.m_thr; }

private:
  /* Advance to the next thread.  */
  void advance ();

private:
  /* The current inferior and thread.  M_THR is NULL if we reached the
     end of the threads list of the last inferior.  */
  inferior *m_inf;
  thread_info *m_thr;
};

/* Iterate over all threads that match a given PTID.  */

class all_matching_threads_iterator
{
public:
  typedef all_matching_threads_iterator self_type;
  typedef struct thread_info *value_type;
  typedef struct thread_info *&reference;
  typedef struct thread_info **pointer;
  typedef std::forward_iterator_tag iterator_category;
  typedef int difference_type;

  /* Creates an iterator that iterates over all threads that match
     FILTER_PTID.  */
  explicit all_matching_threads_iterator (ptid_t filter_ptid);

  /* Create a one-past-end iterator.  */
  all_matching_threads_iterator ()
    : m_inf (nullptr),
      m_thr (nullptr),
      m_filter_ptid (minus_one_ptid)
  {}

  thread_info *operator* () const { return m_thr; }

  all_matching_threads_iterator &operator++ ()
  {
    advance ();
    return *this;
  }

  bool operator== (const all_matching_threads_iterator &other) const
  { return m_thr == other.m_thr; }

  bool operator!= (const all_matching_threads_iterator &other) const
  { return m_thr != other.m_thr; }

private:
  /* Advance to next thread, skipping filtered threads.  */
  void advance ();

  /* True if M_INF matches the process identified by
     M_FILTER_PTID.  */
  bool m_inf_matches ();

private:
  /* The current inferior.  */
  inferior *m_inf;

  /* The current thread.  */
  thread_info *m_thr;

  /* The filter.  */
  ptid_t m_filter_ptid;
};

/* Filter for filtered_iterator.  Filters out exited threads.  */

struct non_exited_thread_filter
{
  bool operator() (struct thread_info *thr) const
  {
    return thr->state != THREAD_EXITED;
  }
};

/* Iterate over all non-exited threads that match a given PTID.  */

using all_non_exited_threads_iterator
  = filtered_iterator<all_matching_threads_iterator, non_exited_thread_filter>;

/* Iterate over all non-exited threads of an inferior.  */

using inf_non_exited_threads_iterator
  = filtered_iterator<inf_threads_iterator, non_exited_thread_filter>;

/* Iterate over all threads of all inferiors, safely.  */

using all_threads_safe_iterator
  = basic_safe_iterator<all_threads_iterator>;

/* Iterate over all threads of an inferior, safely.  */

using safe_inf_threads_iterator
  = basic_safe_iterator<inf_threads_iterator>;

/* A range adapter that makes it possible to iterate over all threads
   of an inferior with range-for.  */

using inf_threads_range
  = next_adapter<thread_info, inf_threads_iterator>;

/* A range adapter that makes it possible to iterate over all
   non-exited threads of an inferior with range-for.  */

using inf_non_exited_threads_range
  = next_adapter<thread_info, inf_non_exited_threads_iterator>;

/* A range adapter that makes it possible to iterate over all threads
   of an inferior with range-for, safely.  */

using safe_inf_threads_range
  = next_adapter<thread_info, safe_inf_threads_iterator>;

/* A range adapter that makes it possible to iterate over all threads
   of all inferiors with range-for.  */

struct all_threads_range
{
  all_threads_iterator begin () const
  { return all_threads_iterator (all_threads_iterator::begin_t {}); }
  all_threads_iterator end () const
  { return all_threads_iterator (); }
};

/* A range adapter that makes it possible to iterate over all threads
   with range-for "safely".  I.e., it is safe to delete the
   currently-iterated thread.  */

struct all_threads_safe_range
{
  all_threads_safe_iterator begin () const
  { return all_threads_safe_iterator (all_threads_iterator::begin_t {}); }
  all_threads_safe_iterator end () const
  { return all_threads_safe_iterator (); }
};

/* A range adapter that makes it possible to iterate over all threads
   that match a PTID filter with range-for.  */

struct all_matching_threads_range
{
public:
  explicit all_matching_threads_range (ptid_t filter_ptid)
    : m_filter_ptid (filter_ptid)
  {}
  all_matching_threads_range ()
    : m_filter_ptid (minus_one_ptid)
  {}

  all_matching_threads_iterator begin () const
  { return all_matching_threads_iterator (m_filter_ptid); }
  all_matching_threads_iterator end () const
  { return all_matching_threads_iterator (); }

private:
  /* The filter.  */
  ptid_t m_filter_ptid;
};

/* A range adapter that makes it possible to iterate over all
   non-exited threads of all inferiors, with range-for.
   Threads/inferiors that do not match FILTER_PTID are filtered
   out.  */

class all_non_exited_threads_range
{
public:
  explicit all_non_exited_threads_range (ptid_t filter_ptid)
    : m_filter_ptid (filter_ptid)
  {}

  all_non_exited_threads_range ()
    : m_filter_ptid (minus_one_ptid)
  {}

  all_non_exited_threads_iterator begin () const
  { return all_non_exited_threads_iterator (m_filter_ptid); }
  all_non_exited_threads_iterator end () const
  { return all_non_exited_threads_iterator (); }

private:
  ptid_t m_filter_ptid;
};

#endif /* THREAD_ITER_H */