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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/>. */
- #ifndef PROCESS_STRATUM_TARGET_H
- #define PROCESS_STRATUM_TARGET_H
- #include "target.h"
- #include <set>
- #include "gdbsupport/intrusive_list.h"
- #include "gdbthread.h"
- /* Abstract base class inherited by all process_stratum targets. */
- class process_stratum_target : public target_ops
- {
- public:
- ~process_stratum_target () override = 0;
- strata stratum () const final override { return process_stratum; }
- /* Return a string representation of this target's open connection.
- This string is used to distinguish different instances of a given
- target type. For example, when remote debugging, the target is
- called "remote", but since we may have more than one remote
- target open, connection_string() returns the connection serial
- connection name, e.g., "localhost:10001", "192.168.0.1:20000",
- etc. This string is shown in several places, e.g., in "info
- connections" and "info inferiors". */
- virtual const char *connection_string () { return nullptr; }
- /* We must default these because they must be implemented by any
- target that can run. */
- bool can_async_p () override { return false; }
- bool supports_non_stop () override { return false; }
- bool supports_disable_randomization () override { return false; }
- /* This default implementation returns the inferior's address
- space. */
- struct address_space *thread_address_space (ptid_t ptid) override;
- /* This default implementation always returns target_gdbarch (). */
- struct gdbarch *thread_architecture (ptid_t ptid) override;
- /* Default implementations for process_stratum targets. Return true
- if there's a selected inferior, false otherwise. */
- bool has_all_memory () override;
- bool has_memory () override;
- bool has_stack () override;
- bool has_registers () override;
- bool has_execution (inferior *inf) override;
- /* Default implementation of follow_exec.
- If the current inferior and FOLLOW_INF are different (execution continues
- in a new inferior), push this process target to FOLLOW_INF's target stack
- and add an initial thread to FOLLOW_INF. */
- void follow_exec (inferior *follow_inf, ptid_t ptid,
- const char *execd_pathname) override;
- /* Default implementation of follow_fork.
- If a child inferior was created by infrun while following the fork
- (CHILD_INF is non-nullptr), push this target on CHILD_INF's target stack
- and add an initial thread with ptid CHILD_PTID. */
- void follow_fork (inferior *child_inf, ptid_t child_ptid,
- target_waitkind fork_kind, bool follow_child,
- bool detach_on_fork) override;
- /* True if any thread is, or may be executing. We need to track
- this separately because until we fully sync the thread list, we
- won't know whether the target is fully stopped, even if we see
- stop events for all known threads, because any of those threads
- may have spawned new threads we haven't heard of yet. */
- bool threads_executing = false;
- /* If THREAD is resumed and has a pending wait status, add it to the
- target's "resumed with pending wait status" list. */
- void maybe_add_resumed_with_pending_wait_status (thread_info *thread);
- /* If THREAD is resumed and has a pending wait status, remove it from the
- target's "resumed with pending wait status" list. */
- void maybe_remove_resumed_with_pending_wait_status (thread_info *thread);
- /* Return true if this target has at least one resumed thread with a pending
- wait status. */
- bool has_resumed_with_pending_wait_status () const
- { return !m_resumed_with_pending_wait_status.empty (); }
- /* Return a random resumed thread with pending wait status belonging to INF
- and matching FILTER_PTID. */
- thread_info *random_resumed_with_pending_wait_status
- (inferior *inf, ptid_t filter_ptid);
- /* The connection number. Visible in "info connections". */
- int connection_number = 0;
- /* Whether resumed threads must be committed to the target.
- When true, resumed threads must be committed to the execution
- target.
- When false, the target may leave resumed threads stopped when
- it's convenient or efficient to do so. When the core requires
- resumed threads to be committed again, this is set back to true
- and calls the `commit_resumed` method to allow the target to do
- so.
- To simplify the implementation of targets, the following methods
- are guaranteed to be called with COMMIT_RESUMED_STATE set to
- false:
- - resume
- - stop
- - wait
- Knowing this, the target doesn't need to implement different
- behaviors depending on the COMMIT_RESUMED_STATE, and can simply
- assume that it is false.
- Targets can take advantage of this to batch resumption requests,
- for example. In that case, the target doesn't actually resume in
- its `resume` implementation. Instead, it takes note of the
- resumption intent in `resume` and defers the actual resumption to
- `commit_resumed`. For example, the remote target uses this to
- coalesce multiple resumption requests in a single vCont
- packet. */
- bool commit_resumed_state = false;
- private:
- /* List of threads managed by this target which simultaneously are resumed
- and have a pending wait status.
- This is done for optimization reasons, it would be possible to walk the
- inferior thread lists to find these threads. But since this is something
- we need to do quite frequently in the hot path, maintaining this list
- avoids walking the thread lists repeatedly. */
- thread_info_resumed_with_pending_wait_status_list
- m_resumed_with_pending_wait_status;
- };
- /* Downcast TARGET to process_stratum_target. */
- static inline process_stratum_target *
- as_process_stratum_target (target_ops *target)
- {
- gdb_assert (target->stratum () == process_stratum);
- return static_cast<process_stratum_target *> (target);
- }
- /* Return a collection of targets that have non-exited inferiors. */
- extern std::set<process_stratum_target *> all_non_exited_process_targets ();
- /* Switch to the first inferior (and program space) of TARGET, and
- switch to no thread selected. */
- extern void switch_to_target_no_thread (process_stratum_target *target);
- #endif /* !defined (PROCESS_STRATUM_TARGET_H) */
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