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257 lines
7.0 KiB
C++
257 lines
7.0 KiB
C++
/* Thread iterators and ranges for GDB, the GNU debugger.
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Copyright (C) 2018-2020 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 THREAD_ITER_H
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#define THREAD_ITER_H
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#include "gdbsupport/filtered-iterator.h"
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#include "gdbsupport/next-iterator.h"
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#include "gdbsupport/safe-iterator.h"
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/* A forward iterator that iterates over a given inferior's
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threads. */
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using inf_threads_iterator = next_iterator<thread_info>;
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/* A forward iterator that iterates over all threads of all
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inferiors. */
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class all_threads_iterator
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{
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public:
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typedef all_threads_iterator self_type;
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typedef struct thread_info *value_type;
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typedef struct thread_info *&reference;
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typedef struct thread_info **pointer;
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typedef std::forward_iterator_tag iterator_category;
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typedef int difference_type;
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/* Tag type. */
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struct begin_t {};
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/* Create an iterator that points to the first thread of the first
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inferior. */
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explicit all_threads_iterator (begin_t);
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/* Create a one-past-end iterator. */
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all_threads_iterator ()
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: m_thr (nullptr)
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{}
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thread_info *operator* () const { return m_thr; }
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all_threads_iterator &operator++ ()
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{
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advance ();
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return *this;
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}
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bool operator== (const all_threads_iterator &other) const
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{ return m_thr == other.m_thr; }
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bool operator!= (const all_threads_iterator &other) const
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{ return m_thr != other.m_thr; }
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private:
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/* Advance to the next thread. */
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void advance ();
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private:
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/* The current inferior and thread. M_THR is NULL if we reached the
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end of the threads list of the last inferior. */
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inferior *m_inf;
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thread_info *m_thr;
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};
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/* Iterate over all threads that match a given PTID. */
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class all_matching_threads_iterator
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{
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public:
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typedef all_matching_threads_iterator self_type;
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typedef struct thread_info *value_type;
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typedef struct thread_info *&reference;
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typedef struct thread_info **pointer;
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typedef std::forward_iterator_tag iterator_category;
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typedef int difference_type;
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/* Creates an iterator that iterates over all threads that match
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FILTER_PTID. */
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explicit all_matching_threads_iterator (ptid_t filter_ptid);
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/* Create a one-past-end iterator. */
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all_matching_threads_iterator ()
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: m_inf (nullptr),
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m_thr (nullptr),
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m_filter_ptid (minus_one_ptid)
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{}
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thread_info *operator* () const { return m_thr; }
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all_matching_threads_iterator &operator++ ()
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{
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advance ();
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return *this;
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}
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bool operator== (const all_matching_threads_iterator &other) const
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{ return m_thr == other.m_thr; }
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bool operator!= (const all_matching_threads_iterator &other) const
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{ return m_thr != other.m_thr; }
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private:
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/* Advance to next thread, skipping filtered threads. */
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void advance ();
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/* True if M_INF matches the process identified by
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M_FILTER_PTID. */
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bool m_inf_matches ();
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private:
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/* The current inferior. */
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inferior *m_inf;
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/* The current thread. */
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thread_info *m_thr;
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/* The filter. */
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ptid_t m_filter_ptid;
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};
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/* Filter for filtered_iterator. Filters out exited threads. */
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struct non_exited_thread_filter
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{
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bool operator() (struct thread_info *thr) const
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{
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return thr->state != THREAD_EXITED;
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}
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};
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/* Iterate over all non-exited threads that match a given PTID. */
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using all_non_exited_threads_iterator
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= filtered_iterator<all_matching_threads_iterator, non_exited_thread_filter>;
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/* Iterate over all non-exited threads of an inferior. */
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using inf_non_exited_threads_iterator
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= filtered_iterator<inf_threads_iterator, non_exited_thread_filter>;
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/* Iterate over all threads of all inferiors, safely. */
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using all_threads_safe_iterator
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= basic_safe_iterator<all_threads_iterator>;
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/* Iterate over all threads of an inferior, safely. */
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using safe_inf_threads_iterator
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= basic_safe_iterator<inf_threads_iterator>;
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/* A range adapter that makes it possible to iterate over all threads
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of an inferior with range-for. */
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using inf_threads_range
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= next_adapter<thread_info, inf_threads_iterator>;
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/* A range adapter that makes it possible to iterate over all
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non-exited threads of an inferior with range-for. */
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using inf_non_exited_threads_range
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= next_adapter<thread_info, inf_non_exited_threads_iterator>;
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/* A range adapter that makes it possible to iterate over all threads
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of an inferior with range-for, safely. */
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using safe_inf_threads_range
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= next_adapter<thread_info, safe_inf_threads_iterator>;
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/* A range adapter that makes it possible to iterate over all threads
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of all inferiors with range-for. */
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struct all_threads_range
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{
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all_threads_iterator begin () const
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{ return all_threads_iterator (all_threads_iterator::begin_t {}); }
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all_threads_iterator end () const
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{ return all_threads_iterator (); }
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};
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/* A range adapter that makes it possible to iterate over all threads
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with range-for "safely". I.e., it is safe to delete the
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currently-iterated thread. */
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struct all_threads_safe_range
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{
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all_threads_safe_iterator begin () const
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{ return all_threads_safe_iterator (all_threads_iterator::begin_t {}); }
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all_threads_safe_iterator end () const
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{ return all_threads_safe_iterator (); }
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};
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/* A range adapter that makes it possible to iterate over all threads
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that match a PTID filter with range-for. */
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struct all_matching_threads_range
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{
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public:
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explicit all_matching_threads_range (ptid_t filter_ptid)
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: m_filter_ptid (filter_ptid)
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{}
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all_matching_threads_range ()
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: m_filter_ptid (minus_one_ptid)
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{}
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all_matching_threads_iterator begin () const
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{ return all_matching_threads_iterator (m_filter_ptid); }
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all_matching_threads_iterator end () const
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{ return all_matching_threads_iterator (); }
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private:
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/* The filter. */
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ptid_t m_filter_ptid;
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};
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/* A range adapter that makes it possible to iterate over all
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non-exited threads of all inferiors, with range-for.
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Threads/inferiors that do not match FILTER_PTID are filtered
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out. */
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class all_non_exited_threads_range
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{
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public:
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explicit all_non_exited_threads_range (ptid_t filter_ptid)
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: m_filter_ptid (filter_ptid)
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{}
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all_non_exited_threads_range ()
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: m_filter_ptid (minus_one_ptid)
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{}
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all_non_exited_threads_iterator begin () const
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{ return all_non_exited_threads_iterator (m_filter_ptid); }
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all_non_exited_threads_iterator end () const
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{ return all_non_exited_threads_iterator (); }
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private:
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ptid_t m_filter_ptid;
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};
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#endif /* THREAD_ITER_H */
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