gdb/inferior-iter.h

   1 /* Inferior iterators and ranges for GDB, the GNU debugger.
   2
   3    Copyright (C) 2018-2022 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef INFERIOR_ITER_H
  21 #define INFERIOR_ITER_H
  22
  23 #include "gdbsupport/filtered-iterator.h"
  24 #include "gdbsupport/safe-iterator.h"
  25
  26 /* A forward iterator that iterates over all inferiors.  */
  27
  28 class all_inferiors_iterator
  29 {
  30 public:
  31   typedef all_inferiors_iterator self_type;
  32   typedef struct inferior *value_type;
  33   typedef struct inferior *&reference;
  34   typedef struct inferior **pointer;
  35   typedef std::forward_iterator_tag iterator_category;
  36   typedef int difference_type;
  37
  38   /* Create an iterator pointing at HEAD.  */
  39   all_inferiors_iterator (process_stratum_target *proc_target,
  40                           const intrusive_list<inferior> &list)
  41     : m_proc_target (proc_target), m_inf_iter (list.begin ())
  42   {
  43     intrusive_list<inferior>::iterator end;
  44
  45     /* Advance M_INF to the first inferior's position.  */
  46     for (; m_inf_iter != end; ++m_inf_iter)
  47       if (m_inf_matches ())
  48         return;
  49   }
  50
  51   /* Create a one-past-end iterator.  */
  52   all_inferiors_iterator ()
  53     : m_proc_target (nullptr)
  54   {}
  55
  56   all_inferiors_iterator &operator++ ()
  57   {
  58     advance ();
  59     return *this;
  60   }
  61
  62   inferior *operator* () const
  63   { return &*m_inf_iter; }
  64
  65   bool operator!= (const all_inferiors_iterator &other) const
  66   { return m_inf_iter != other.m_inf_iter; }
  67
  68 private:
  69   /* Advance to next inferior, skipping filtered inferiors.  */
  70   void advance ()
  71   {
  72     intrusive_list<inferior>::iterator end;
  73
  74     /* The loop below is written in the natural way as-if we'd always
  75        start at the beginning of the inferior list.  This
  76        fast-forwards the algorithm to the actual current position.  */
  77     goto start;
  78
  79     while (m_inf_iter != end)
  80       {
  81         if (m_inf_matches ())
  82           return;
  83       start:
  84         ++m_inf_iter;
  85       }
  86   }
  87
  88   bool m_inf_matches ()
  89   {
  90     return (m_proc_target == nullptr
  91             || m_proc_target == m_inf_iter->process_target ());
  92   }
  93
  94   process_stratum_target *m_proc_target;
  95   intrusive_list<inferior>::iterator m_inf_iter;
  96 };
  97
  98 /* A range adapter that makes it possible to iterate over all
  99    inferiors with range-for.  */
 100
 101 using all_inferiors_range = iterator_range<all_inferiors_iterator>;
 102
 103 /* Filter for filtered_iterator.  Filters out exited inferiors.  */
 104
 105 struct exited_inferior_filter
 106 {
 107   bool operator() (inferior *inf)
 108   {
 109     return inf->pid != 0;
 110   }
 111 };
 112
 113 /* Iterate over all non-exited inferiors.  */
 114
 115 using all_non_exited_inferiors_iterator
 116   = filtered_iterator<all_inferiors_iterator, exited_inferior_filter>;
 117
 118 /* A range adapter that makes it possible to iterate over all
 119    non-exited inferiors with range-for.  */
 120
 121 using all_non_exited_inferiors_range
 122   = iterator_range<all_non_exited_inferiors_iterator>;
 123
 124 /* Iterate over all inferiors, safely.  */
 125
 126 using all_inferiors_safe_iterator
 127   = basic_safe_iterator<all_inferiors_iterator>;
 128
 129 /* A range adapter that makes it possible to iterate over all
 130    inferiors with range-for "safely".  I.e., it is safe to delete the
 131    currently-iterated inferior.  */
 132
 133 using all_inferiors_safe_range = iterator_range<all_inferiors_safe_iterator>;
 134
 135 #endif /* !defined (INFERIOR_ITER_H) */