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