/* Multi-process/thread control defs for GDB, the GNU debugger.
- Copyright (C) 1987-2018 Free Software Foundation, Inc.
+ Copyright (C) 1987-2020 Free Software Foundation, Inc.
Contributed by Lynx Real-Time Systems, Inc. Los Gatos, CA.
#include "frame.h"
#include "ui-out.h"
#include "btrace.h"
-#include "common/vec.h"
#include "target/waitstatus.h"
#include "cli/cli-utils.h"
-#include "common/refcounted-object.h"
-#include "common-gdbthread.h"
+#include "gdbsupport/refcounted-object.h"
+#include "gdbsupport/common-gdbthread.h"
+#include "gdbsupport/forward-scope-exit.h"
+#include "displaced-stepping.h"
struct inferior;
+struct process_stratum_target;
/* Frontend view of the thread state. Possible extensions: stepping,
- finishing, until(ling),... */
+ finishing, until(ling),...
+
+ NOTE: Since the thread state is not a boolean, most times, you do
+ not want to check it with negation. If you really want to check if
+ the thread is stopped,
+
+ use (good):
+
+ if (tp->state == THREAD_STOPPED)
+
+ instead of (bad):
+
+ if (tp->state != THREAD_RUNNING)
+
+ The latter is also true for exited threads, most likely not what
+ you want. */
enum thread_state
{
+ /* In the frontend's perpective, the thread is stopped. */
THREAD_STOPPED,
+
+ /* In the frontend's perpective, the thread is running. */
THREAD_RUNNING,
+
+ /* The thread is listed, but known to have exited. We keep it
+ listed (but not visible) until it's safe to delete it. */
THREAD_EXITED,
};
reverting back (e.g., due to a "kill" command). If the thread
meanwhile exits before being re-selected, then the thread object is
left listed in the thread list, but marked with state
- THREAD_EXITED. (See make_cleanup_restore_current_thread and
+ THREAD_EXITED. (See scoped_restore_current_thread and
delete_thread). All other thread references are considered weak
references. Placing a thread in the thread list is an implicit
strong reference, and is thus not accounted for in the thread's
/* Mark this thread as running and notify observers. */
void set_running (bool running);
+ struct regcache *regcache ();
+ struct gdbarch *arch ();
+
struct thread_info *next = NULL;
ptid_t ptid; /* "Actual process id";
In fact, this may be overloaded with
if the thread does not have a user-given name. */
char *name = NULL;
- /* Non-zero means the thread is executing. Note: this is different
+ /* True means the thread is executing. Note: this is different
from saying that there is an active target and we are stopped at
a breakpoint, for instance. This is a real indicator whether the
thread is off and running. */
- int executing = 0;
+ bool executing = false;
- /* Non-zero if this thread is resumed from infrun's perspective.
+ /* True if this thread is resumed from infrun's perspective.
Note that a thread can be marked both as not-executing and
resumed at the same time. This happens if we try to resume a
thread that has a wait status pending. We shouldn't let the
thread really run until that wait status has been processed, but
we should not process that wait status if we didn't try to let
the thread run. */
- int resumed = 0;
+ bool resumed = false;
/* Frontend view of the thread state. Note that the THREAD_RUNNING/
THREAD_STOPPED states are different from EXECUTING. When the
fields point to self. */
struct thread_info *step_over_prev = NULL;
struct thread_info *step_over_next = NULL;
+
+ displaced_step_thread_state displaced_step_state;
};
/* A gdb::ref_ptr pointer to a thread_info. */
that a new thread is found, and return the pointer to
the new thread. Caller my use this pointer to
initialize the private thread data. */
-extern struct thread_info *add_thread (ptid_t ptid);
+extern struct thread_info *add_thread (process_stratum_target *targ,
+ ptid_t ptid);
-/* Same as add_thread, but does not print a message
- about new thread. */
-extern struct thread_info *add_thread_silent (ptid_t ptid);
+/* Same as add_thread, but does not print a message about new
+ thread. */
+extern struct thread_info *add_thread_silent (process_stratum_target *targ,
+ ptid_t ptid);
/* Same as add_thread, and sets the private info. */
-extern struct thread_info *add_thread_with_info (ptid_t ptid,
- struct private_thread_info *);
+extern struct thread_info *add_thread_with_info (process_stratum_target *targ,
+ ptid_t ptid,
+ private_thread_info *);
/* Delete an existing thread list entry. */
extern void delete_thread (struct thread_info *thread);
const char *print_thread_id (struct thread_info *thr);
/* Boolean test for an already-known ptid. */
-extern int in_thread_list (ptid_t ptid);
+extern bool in_thread_list (process_stratum_target *targ, ptid_t ptid);
/* Boolean test for an already-known global thread id (GDB's homegrown
global id, not the system's). */
extern int valid_global_thread_id (int global_id);
+/* Find thread PTID of inferior INF. */
+extern thread_info *find_thread_ptid (inferior *inf, ptid_t ptid);
+
/* Search function to lookup a thread by 'pid'. */
-extern struct thread_info *find_thread_ptid (ptid_t ptid);
+extern struct thread_info *find_thread_ptid (process_stratum_target *targ,
+ ptid_t ptid);
/* Search function to lookup a thread by 'ptid'. Only searches in
threads of INF. */
struct thread_info *find_thread_global_id (int global_id);
/* Find thread by thread library specific handle in inferior INF. */
-struct thread_info *find_thread_by_handle (struct value *thread_handle,
- struct inferior *inf);
+struct thread_info *find_thread_by_handle
+ (gdb::array_view<const gdb_byte> handle, struct inferior *inf);
/* Finds the first thread of the specified inferior. */
extern struct thread_info *first_thread_of_inferior (inferior *inf);
extern struct thread_info *any_live_thread_of_inferior (inferior *inf);
/* Change the ptid of thread OLD_PTID to NEW_PTID. */
-void thread_change_ptid (ptid_t old_ptid, ptid_t new_ptid);
+void thread_change_ptid (process_stratum_target *targ,
+ ptid_t old_ptid, ptid_t new_ptid);
/* Iterator function to call a user-provided callback function
once for each known thread. */
iterators. Must be done after struct thread_info is defined. */
#include "thread-iter.h"
-/* Return a range that can be used to walk over all threads of all
- inferiors, with range-for. Used like this:
+/* Return a range that can be used to walk over threads, with
+ range-for.
+
+ Used like this, it walks over all threads of all inferiors of all
+ targets:
for (thread_info *thr : all_threads ())
{ .... }
-*/
-inline all_threads_range
-all_threads ()
-{
- return {};
-}
-/* Likewise, but accept a filter PTID. */
+ FILTER_PTID can be used to filter out threads that don't match.
+ FILTER_PTID can be:
+
+ - minus_one_ptid, meaning walk all threads of all inferiors of
+ PROC_TARGET. If PROC_TARGET is NULL, then of all targets.
+
+ - A process ptid, in which case walk all threads of the specified
+ process. PROC_TARGET must be non-NULL in this case.
+
+ - A thread ptid, in which case walk that thread only. PROC_TARGET
+ must be non-NULL in this case.
+*/
inline all_matching_threads_range
-all_threads (ptid_t filter_ptid)
+all_threads (process_stratum_target *proc_target = nullptr,
+ ptid_t filter_ptid = minus_one_ptid)
{
- return all_matching_threads_range (filter_ptid);
+ return all_matching_threads_range (proc_target, filter_ptid);
}
/* Return a range that can be used to walk over all non-exited threads
- of all inferiors, with range-for. FILTER_PTID can be used to
- filter out thread that don't match. */
+ of all inferiors, with range-for. Arguments are like all_threads
+ above. */
inline all_non_exited_threads_range
-all_non_exited_threads (ptid_t filter_ptid = minus_one_ptid)
+all_non_exited_threads (process_stratum_target *proc_target = nullptr,
+ ptid_t filter_ptid = minus_one_ptid)
{
- return all_non_exited_threads_range (filter_ptid);
+ return all_non_exited_threads_range (proc_target, filter_ptid);
}
/* Return a range that can be used to walk over all threads of all
inline all_threads_safe_range
all_threads_safe ()
{
- return all_threads_safe_range ();
+ return {};
}
-extern int thread_count (void);
+extern int thread_count (process_stratum_target *proc_target);
/* Return true if we have any thread in any inferior. */
extern bool any_thread_p ();
/* Switch from one thread to another. Does not read registers. */
extern void switch_to_thread_no_regs (struct thread_info *thread);
-/* Marks or clears thread(s) PTID as resumed. If PTID is
- MINUS_ONE_PTID, applies to all threads. If ptid_is_pid(PTID) is
- true, applies to all threads of the process pointed at by PTID. */
-extern void set_resumed (ptid_t ptid, int resumed);
-
-/* Marks thread PTID is running, or stopped.
- If PTID is minus_one_ptid, marks all threads. */
-extern void set_running (ptid_t ptid, int running);
-
-/* Marks or clears thread(s) PTID as having been requested to stop.
- If PTID is MINUS_ONE_PTID, applies to all threads. If
+/* Marks or clears thread(s) PTID of TARG as resumed. If PTID is
+ MINUS_ONE_PTID, applies to all threads of TARG. If
ptid_is_pid(PTID) is true, applies to all threads of the process
- pointed at by PTID. If STOP, then the THREAD_STOP_REQUESTED
- observer is called with PTID as argument. */
-extern void set_stop_requested (ptid_t ptid, int stop);
-
-/* NOTE: Since the thread state is not a boolean, most times, you do
- not want to check it with negation. If you really want to check if
- the thread is stopped,
-
- use (good):
-
- if (is_stopped (ptid))
-
- instead of (bad):
-
- if (!is_running (ptid))
-
- The latter also returns true on exited threads, most likelly not
- what you want. */
-
-/* Reports if in the frontend's perpective, thread PTID is running. */
-extern int is_running (ptid_t ptid);
-
-/* Is this thread listed, but known to have exited? We keep it listed
- (but not visible) until it's safe to delete. */
-extern int is_exited (ptid_t ptid);
-
-/* In the frontend's perpective, is this thread stopped? */
-extern int is_stopped (ptid_t ptid);
-
-/* Marks thread PTID as executing, or not. If PTID is minus_one_ptid,
- marks all threads.
+ pointed at by {TARG,PTID}. */
+extern void set_resumed (process_stratum_target *targ,
+ ptid_t ptid, bool resumed);
+
+/* Marks thread PTID of TARG as running, or as stopped. If PTID is
+ minus_one_ptid, marks all threads of TARG. */
+extern void set_running (process_stratum_target *targ,
+ ptid_t ptid, bool running);
+
+/* Marks or clears thread(s) PTID of TARG as having been requested to
+ stop. If PTID is MINUS_ONE_PTID, applies to all threads of TARG.
+ If ptid_is_pid(PTID) is true, applies to all threads of the process
+ pointed at by {TARG, PTID}. If STOP, then the
+ THREAD_STOP_REQUESTED observer is called with PTID as argument. */
+extern void set_stop_requested (process_stratum_target *targ,
+ ptid_t ptid, bool stop);
+
+/* Marks thread PTID of TARG as executing, or not. If PTID is
+ minus_one_ptid, marks all threads of TARG.
Note that this is different from the running state. See the
description of state and executing fields of struct
thread_info. */
-extern void set_executing (ptid_t ptid, int executing);
+extern void set_executing (process_stratum_target *targ,
+ ptid_t ptid, bool executing);
-/* True if any (known or unknown) thread is or may be executing. */
-extern int threads_are_executing (void);
+/* True if any (known or unknown) thread of TARG is or may be
+ executing. */
+extern bool threads_are_executing (process_stratum_target *targ);
-/* Merge the executing property of thread PTID over to its thread
- state property (frontend running/stopped view).
+/* Merge the executing property of thread PTID of TARG over to its
+ thread state property (frontend running/stopped view).
"not executing" -> "stopped"
"executing" -> "running"
"exited" -> "exited"
- If PTID is minus_one_ptid, go over all threads.
+ If PTID is minus_one_ptid, go over all threads of TARG.
Notifications are only emitted if the thread state did change. */
-extern void finish_thread_state (ptid_t ptid);
+extern void finish_thread_state (process_stratum_target *targ, ptid_t ptid);
/* Calls finish_thread_state on scope exit, unless release() is called
to disengage. */
-class scoped_finish_thread_state
-{
-public:
- explicit scoped_finish_thread_state (ptid_t ptid)
- : m_ptid (ptid)
- {}
-
- ~scoped_finish_thread_state ()
- {
- if (!m_released)
- finish_thread_state (m_ptid);
- }
-
- /* Disengage. */
- void release ()
- {
- m_released = true;
- }
-
- DISABLE_COPY_AND_ASSIGN (scoped_finish_thread_state);
-
-private:
- bool m_released = false;
- ptid_t m_ptid;
-};
+using scoped_finish_thread_state
+ = FORWARD_SCOPE_EXIT (finish_thread_state);
/* Commands with a prefix of `thread'. */
extern struct cmd_list_element *thread_cmd_list;
/* Print notices on thread events (attach, detach, etc.), set with
`set print thread-events'. */
-extern int print_thread_events;
+extern bool print_thread_events;
/* Prints the list of threads and their details on UIOUT. If
REQUESTED_THREADS, a list of GDB ids/ranges, is not NULL, only
all attached PIDs are printed. If both REQUESTED_THREADS is not
NULL and PID is not -1, then the thread is printed if it belongs to
the specified process. Otherwise, an error is raised. */
-extern void print_thread_info (struct ui_out *uiout, char *requested_threads,
+extern void print_thread_info (struct ui_out *uiout,
+ const char *requested_threads,
int pid);
/* Save/restore current inferior/thread/frame. */
DISABLE_COPY_AND_ASSIGN (scoped_restore_current_thread);
+ /* Cancel restoring on scope exit. */
+ void dont_restore () { m_dont_restore = true; }
+
private:
+ void restore ();
+
+ bool m_dont_restore = false;
/* Use the "class" keyword here, because of a clash with a "thread_info"
function in the Darwin API. */
class thread_info *m_thread;
extern bool value_in_thread_stack_temporaries (struct value *,
struct thread_info *thr);
-/* Add TP to the end of its inferior's pending step-over chain. */
+/* Add TP to the end of the global pending step-over chain. */
+
+extern void global_thread_step_over_chain_enqueue (struct thread_info *tp);
+
+/* Remove TP from step-over chain LIST_P. */
+
+extern void thread_step_over_chain_remove (thread_info **list_p,
+ thread_info *tp);
-extern void thread_step_over_chain_enqueue (struct thread_info *tp);
+/* Remove TP from the global pending step-over chain. */
-/* Remove TP from its inferior's pending step-over chain. */
+extern void global_thread_step_over_chain_remove (thread_info *tp);
-extern void thread_step_over_chain_remove (struct thread_info *tp);
+/* Return the next thread in the step-over chain whose head is CHAIN_HEAD.
+ Return NULL if TP is the last entry in the chain. */
-/* Return the next thread in the step-over chain starting at TP. NULL
- if TP is the last entry in the chain. */
+extern thread_info *thread_step_over_chain_next (thread_info *chain_head,
+ thread_info *tp);
-extern struct thread_info *thread_step_over_chain_next (struct thread_info *tp);
+/* Return the next thread in the global step-over chain. Return NULL if TP is
+ the last entry in the chain. */
-/* Return true if TP is in the step-over chain. */
+extern thread_info *global_thread_step_over_chain_next (thread_info *tp);
+
+/* Return true if TP is in any step-over chain. */
extern int thread_is_in_step_over_chain (struct thread_info *tp);
+/* Return the length of the the step over chain TP is in. */
+
+extern int thread_step_over_chain_length (thread_info *tp);
+
/* Cancel any ongoing execution command. */
extern void thread_cancel_execution_command (struct thread_info *thr);
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