224 lines
6 KiB
C
224 lines
6 KiB
C
/* Abstract base class inherited by all process_stratum targets
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Copyright (C) 2018-2022 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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#include "defs.h"
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#include "process-stratum-target.h"
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#include "inferior.h"
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#include <algorithm>
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process_stratum_target::~process_stratum_target ()
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{
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}
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struct address_space *
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process_stratum_target::thread_address_space (ptid_t ptid)
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{
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/* Fall-back to the "main" address space of the inferior. */
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inferior *inf = find_inferior_ptid (this, ptid);
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if (inf == NULL || inf->aspace == NULL)
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internal_error (__FILE__, __LINE__,
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_("Can't determine the current "
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"address space of thread %s\n"),
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target_pid_to_str (ptid).c_str ());
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return inf->aspace;
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}
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struct gdbarch *
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process_stratum_target::thread_architecture (ptid_t ptid)
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{
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inferior *inf = find_inferior_ptid (this, ptid);
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gdb_assert (inf != NULL);
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return inf->gdbarch;
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}
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bool
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process_stratum_target::has_all_memory ()
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{
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/* If no inferior selected, then we can't read memory here. */
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return inferior_ptid != null_ptid;
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}
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bool
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process_stratum_target::has_memory ()
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{
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/* If no inferior selected, then we can't read memory here. */
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return inferior_ptid != null_ptid;
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}
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bool
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process_stratum_target::has_stack ()
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{
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/* If no inferior selected, there's no stack. */
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return inferior_ptid != null_ptid;
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}
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bool
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process_stratum_target::has_registers ()
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{
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/* Can't read registers from no inferior. */
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return inferior_ptid != null_ptid;
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}
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bool
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process_stratum_target::has_execution (inferior *inf)
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{
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/* If there's a process running already, we can't make it run
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through hoops. */
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return inf->pid != 0;
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}
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/* See process-stratum-target.h. */
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void
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process_stratum_target::follow_exec (inferior *follow_inf, ptid_t ptid,
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const char *execd_pathname)
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{
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inferior *orig_inf = current_inferior ();
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if (orig_inf != follow_inf)
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{
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/* Execution continues in a new inferior, push the original inferior's
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process target on the new inferior's target stack. The process target
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may decide to unpush itself from the original inferior's target stack
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after that, at its discretion. */
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follow_inf->push_target (orig_inf->process_target ());
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thread_info *t = add_thread (follow_inf->process_target (), ptid);
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/* Leave the new inferior / thread as the current inferior / thread. */
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switch_to_thread (t);
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}
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}
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/* See process-stratum-target.h. */
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void
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process_stratum_target::follow_fork (inferior *child_inf, ptid_t child_ptid,
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target_waitkind fork_kind,
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bool follow_child,
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bool detach_on_fork)
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{
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if (child_inf != nullptr)
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{
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child_inf->push_target (this);
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add_thread_silent (this, child_ptid);
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}
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}
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/* See process-stratum-target.h. */
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void
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process_stratum_target::maybe_add_resumed_with_pending_wait_status
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(thread_info *thread)
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{
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gdb_assert (!thread->resumed_with_pending_wait_status_node.is_linked ());
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if (thread->resumed () && thread->has_pending_waitstatus ())
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{
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infrun_debug_printf ("adding to resumed threads with event list: %s",
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thread->ptid.to_string ().c_str ());
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m_resumed_with_pending_wait_status.push_back (*thread);
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}
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}
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/* See process-stratum-target.h. */
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void
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process_stratum_target::maybe_remove_resumed_with_pending_wait_status
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(thread_info *thread)
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{
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if (thread->resumed () && thread->has_pending_waitstatus ())
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{
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infrun_debug_printf ("removing from resumed threads with event list: %s",
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thread->ptid.to_string ().c_str ());
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gdb_assert (thread->resumed_with_pending_wait_status_node.is_linked ());
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auto it = m_resumed_with_pending_wait_status.iterator_to (*thread);
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m_resumed_with_pending_wait_status.erase (it);
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}
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else
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gdb_assert (!thread->resumed_with_pending_wait_status_node.is_linked ());
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}
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/* See process-stratum-target.h. */
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thread_info *
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process_stratum_target::random_resumed_with_pending_wait_status
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(inferior *inf, ptid_t filter_ptid)
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{
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auto matches = [inf, filter_ptid] (const thread_info &thread)
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{
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return thread.inf == inf && thread.ptid.matches (filter_ptid);
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};
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/* First see how many matching events we have. */
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const auto &l = m_resumed_with_pending_wait_status;
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unsigned int count = std::count_if (l.begin (), l.end (), matches);
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if (count == 0)
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return nullptr;
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/* Now randomly pick a thread out of those that match the criteria. */
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int random_selector
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= (int) ((count * (double) rand ()) / (RAND_MAX + 1.0));
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if (count > 1)
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infrun_debug_printf ("Found %u events, selecting #%d",
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count, random_selector);
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/* Select the Nth thread that matches. */
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auto it = std::find_if (l.begin (), l.end (),
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[&random_selector, &matches]
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(const thread_info &thread)
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{
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if (!matches (thread))
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return false;
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return random_selector-- == 0;
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});
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gdb_assert (it != l.end ());
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return &*it;
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}
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/* See process-stratum-target.h. */
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std::set<process_stratum_target *>
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all_non_exited_process_targets ()
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{
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/* Inferiors may share targets. To eliminate duplicates, use a set. */
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std::set<process_stratum_target *> targets;
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for (inferior *inf : all_non_exited_inferiors ())
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targets.insert (inf->process_target ());
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return targets;
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}
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/* See process-stratum-target.h. */
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void
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switch_to_target_no_thread (process_stratum_target *target)
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{
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for (inferior *inf : all_inferiors (target))
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{
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switch_to_inferior_no_thread (inf);
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break;
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}
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}
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