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/* Thread iterators and ranges for GDB, the GNU debugger.
Copyright (C) 2018-2023 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/>. */
#include "defs.h"
#include "gdbthread.h"
#include "inferior.h"
/* See thread-iter.h. */
all_threads_iterator::all_threads_iterator (begin_t)
{
/* Advance M_INF/M_THR to the first thread's position. */
for (inferior &inf : inferior_list)
{
auto thr_iter = inf.thread_list.begin ();
if (thr_iter != inf.thread_list.end ())
{
m_inf = &inf;
m_thr = &*thr_iter;
return;
}
}
m_inf = nullptr;
m_thr = nullptr;
}
/* See thread-iter.h. */
void
all_threads_iterator::advance ()
{
intrusive_list<inferior>::iterator inf_iter (m_inf);
intrusive_list<thread_info>::iterator thr_iter (m_thr);
/* The loop below is written in the natural way as-if we'd always
start at the beginning of the inferior list. This fast forwards
the algorithm to the actual current position. */
goto start;
for (; inf_iter != inferior_list.end (); ++inf_iter)
{
m_inf = &*inf_iter;
thr_iter = m_inf->thread_list.begin ();
while (thr_iter != m_inf->thread_list.end ())
{
m_thr = &*thr_iter;
return;
start:
++thr_iter;
}
}
m_thr = nullptr;
}
/* See thread-iter.h. */
bool
all_matching_threads_iterator::m_inf_matches ()
{
return (m_filter_target == nullptr
|| m_filter_target == m_inf->process_target ());
}
/* See thread-iter.h. */
all_matching_threads_iterator::all_matching_threads_iterator
(process_stratum_target *filter_target, ptid_t filter_ptid)
: m_filter_target (filter_target)
{
if (filter_ptid == minus_one_ptid)
{
/* Iterate on all threads of all inferiors, possibly filtering on
FILTER_TARGET. */
m_mode = mode::ALL_THREADS;
/* Seek the first thread of the first matching inferior. */
for (inferior &inf : inferior_list)
{
m_inf = &inf;
if (!m_inf_matches ()
|| inf.thread_list.empty ())
continue;
m_thr = &inf.thread_list.front ();
return;
}
}
else
{
gdb_assert (filter_target != nullptr);
if (filter_ptid.is_pid ())
{
/* Iterate on all threads of the given inferior. */
m_mode = mode::ALL_THREADS_OF_INFERIOR;
m_inf = find_inferior_pid (filter_target, filter_ptid.pid ());
if (m_inf != nullptr)
m_thr = &m_inf->thread_list.front ();
}
else
{
/* Iterate on a single thread. */
m_mode = mode::SINGLE_THREAD;
m_thr = filter_target->find_thread (filter_ptid);
}
}
}
/* See thread-iter.h. */
void
all_matching_threads_iterator::advance ()
{
switch (m_mode)
{
case mode::ALL_THREADS:
{
intrusive_list<inferior>::iterator inf_iter (m_inf);
intrusive_list<thread_info>::iterator thr_iter
= m_inf->thread_list.iterator_to (*m_thr);
/* The loop below is written in the natural way as-if we'd always
start at the beginning of the inferior list. This fast forwards
the algorithm to the actual current position. */
goto start;
for (; inf_iter != inferior_list.end (); ++inf_iter)
{
m_inf = &*inf_iter;
if (!m_inf_matches ())
continue;
thr_iter = m_inf->thread_list.begin ();
while (thr_iter != m_inf->thread_list.end ())
{
m_thr = &*thr_iter;
return;
start:
++thr_iter;
}
}
}
m_thr = nullptr;
break;
case mode::ALL_THREADS_OF_INFERIOR:
{
intrusive_list<thread_info>::iterator thr_iter
= m_inf->thread_list.iterator_to (*m_thr);
++thr_iter;
if (thr_iter != m_inf->thread_list.end ())
m_thr = &*thr_iter;
else
m_thr = nullptr;
break;
}
case mode::SINGLE_THREAD:
m_thr = nullptr;
break;
default:
gdb_assert_not_reached ("invalid mode value");
}
}
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