/* Multi-process/thread control defs for GDB, the GNU debugger.
- Copyright 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1997, 1998, 1999,
- 2000
- Free Software Foundation, Inc.
+ Copyright (C) 1987-1993, 1997-2000, 2007-2012 Free Software
+ Foundation, Inc.
Contributed by Lynx Real-Time Systems, Inc. Los Gatos, CA.
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 2 of the License, or
+ 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,
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, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef GDBTHREAD_H
#define GDBTHREAD_H
-struct breakpoint;
-struct frame_id;
struct symtab;
-/* For bpstat */
#include "breakpoint.h"
-
-/* For struct frame_id. */
#include "frame.h"
+#include "ui-out.h"
+#include "inferior.h"
+
+/* Frontend view of the thread state. Possible extensions: stepping,
+ finishing, until(ling),... */
+enum thread_state
+{
+ THREAD_STOPPED,
+ THREAD_RUNNING,
+ THREAD_EXITED,
+};
+
+/* Inferior thread specific part of `struct infcall_control_state'.
+
+ Inferior process counterpart is `struct inferior_control_state'. */
+
+struct thread_control_state
+{
+ /* User/external stepping state. */
+
+ /* Step-resume or longjmp-resume breakpoint. */
+ struct breakpoint *step_resume_breakpoint;
+
+ /* Exception-resume breakpoint. */
+ struct breakpoint *exception_resume_breakpoint;
+
+ /* Range to single step within.
+
+ If this is nonzero, respond to a single-step signal by continuing
+ to step if the pc is in this range.
+
+ If step_range_start and step_range_end are both 1, it means to
+ step for a single instruction (FIXME: it might clean up
+ wait_for_inferior in a minor way if this were changed to the
+ address of the instruction and that address plus one. But maybe
+ not). */
+ CORE_ADDR step_range_start; /* Inclusive */
+ CORE_ADDR step_range_end; /* Exclusive */
+
+ /* Stack frame address as of when stepping command was issued.
+ This is how we know when we step into a subroutine call, and how
+ to set the frame for the breakpoint used to step out. */
+ struct frame_id step_frame_id;
+
+ /* Similarly, the frame ID of the underlying stack frame (skipping
+ any inlined frames). */
+ struct frame_id step_stack_frame_id;
+
+ /* Nonzero if we are presently stepping over a breakpoint.
+
+ If we hit a breakpoint or watchpoint, and then continue, we need
+ to single step the current thread with breakpoints disabled, to
+ avoid hitting the same breakpoint or watchpoint again. And we
+ should step just a single thread and keep other threads stopped,
+ so that other threads don't miss breakpoints while they are
+ removed.
+
+ So, this variable simultaneously means that we need to single
+ step the current thread, keep other threads stopped, and that
+ breakpoints should be removed while we step.
+
+ This variable is set either:
+ - in proceed, when we resume inferior on user's explicit request
+ - in keep_going, if handle_inferior_event decides we need to
+ step over breakpoint.
+
+ The variable is cleared in normal_stop. The proceed calls
+ wait_for_inferior, which calls handle_inferior_event in a loop,
+ and until wait_for_inferior exits, this variable is changed only
+ by keep_going. */
+ int trap_expected;
+
+ /* Nonzero if the thread is being proceeded for a "finish" command
+ or a similar situation when stop_registers should be saved. */
+ int proceed_to_finish;
+
+ /* Nonzero if the thread is being proceeded for an inferior function
+ call. */
+ int in_infcall;
+
+ enum step_over_calls_kind step_over_calls;
+
+ /* Nonzero if stopped due to a step command. */
+ int stop_step;
+
+ /* Chain containing status of breakpoint(s) the thread stopped
+ at. */
+ bpstat stop_bpstat;
+};
+
+/* Inferior thread specific part of `struct infcall_suspend_state'.
+
+ Inferior process counterpart is `struct inferior_suspend_state'. */
+
+struct thread_suspend_state
+{
+ /* Last signal that the inferior received (why it stopped). */
+ enum gdb_signal stop_signal;
+};
struct thread_info
{
In fact, this may be overloaded with
kernel thread id, etc. */
int num; /* Convenient handle (GDB thread id) */
- /* State from wait_for_inferior */
- CORE_ADDR prev_pc;
- char *prev_func_name;
- struct breakpoint *step_resume_breakpoint;
- struct breakpoint *through_sigtramp_breakpoint;
- CORE_ADDR step_range_start;
- CORE_ADDR step_range_end;
- struct frame_id step_frame_id;
- CORE_ADDR step_sp;
+
+ /* The name of the thread, as specified by the user. This is NULL
+ if the thread does not have a user-given name. */
+ char *name;
+
+ /* Non-zero 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;
+
+ /* Frontend view of the thread state. Note that the RUNNING/STOPPED
+ states are different from EXECUTING. When the thread is stopped
+ internally while handling an internal event, like a software
+ single-step breakpoint, EXECUTING will be false, but running will
+ still be true. As a possible future extension, this could turn
+ into enum { stopped, exited, stepping, finishing, until(ling),
+ running ... } */
+ int state;
+
+ /* If this is > 0, then it means there's code out there that relies
+ on this thread being listed. Don't delete it from the lists even
+ if we detect it exiting. */
+ int refcount;
+
+ /* State of GDB control of inferior thread execution.
+ See `struct thread_control_state'. */
+ struct thread_control_state control;
+
+ /* State of inferior thread to restore after GDB is done with an inferior
+ call. See `struct thread_suspend_state'. */
+ struct thread_suspend_state suspend;
+
int current_line;
struct symtab *current_symtab;
- int trap_expected;
- int handling_longjmp;
- int another_trap;
- /* This is set TRUE when a catchpoint of a shared library event
- triggers. Since we don't wish to leave the inferior in the
- solib hook when we report the event, we step the inferior
- back to user code before stopping and reporting the event. */
- int stepping_through_solib_after_catch;
+ /* Internal stepping state. */
- /* When stepping_through_solib_after_catch is TRUE, this is a
- list of the catchpoints that should be reported as triggering
- when we finally do stop stepping. */
- bpstat stepping_through_solib_catchpoints;
+ /* Record the pc of the thread the last time it stopped. This is
+ maintained by proceed and keep_going, and used in
+ adjust_pc_after_break to distinguish a hardware single-step
+ SIGTRAP from a breakpoint SIGTRAP. */
+ CORE_ADDR prev_pc;
+
+ /* Should we step over breakpoint next time keep_going is called? */
+ int stepping_over_breakpoint;
+
+ /* Set to TRUE if we should finish single-stepping over a breakpoint
+ after hitting the current step-resume breakpoint. The context here
+ is that GDB is to do `next' or `step' while signal arrives.
+ When stepping over a breakpoint and signal arrives, GDB will attempt
+ to skip signal handler, so it inserts a step_resume_breakpoint at the
+ signal return address, and resume inferior.
+ step_after_step_resume_breakpoint is set to TRUE at this moment in
+ order to keep GDB in mind that there is still a breakpoint to step over
+ when GDB gets back SIGTRAP from step_resume_breakpoint. */
+ int step_after_step_resume_breakpoint;
+
+ /* Per-thread command support. */
+
+ /* Pointer to what is left to do for an execution command after the
+ target stops. Used only in asynchronous mode, by targets that
+ support async execution. Several execution commands use it. */
+ struct continuation *continuations;
+
+ /* Similar to the above, but used when a single execution command
+ requires several resume/stop iterations. Used by the step
+ command. */
+ struct continuation *intermediate_continuations;
- /* This is set to TRUE when this thread is in a signal handler
- trampoline and we're single-stepping through it. */
- int stepping_through_sigtramp;
+ /* If stepping, nonzero means step count is > 1 so don't print frame
+ next time inferior stops if it stops due to stepping. */
+ int step_multi;
+
+ /* This is used to remember when a fork or vfork event was caught by
+ a catchpoint, and thus the event is to be followed at the next
+ resume of the thread, and not immediately. */
+ struct target_waitstatus pending_follow;
+
+ /* True if this thread has been explicitly requested to stop. */
+ int stop_requested;
+
+ /* The initiating frame of a nexting operation, used for deciding
+ which exceptions to intercept. If it is null_frame_id no
+ bp_longjmp or bp_exception but longjmp has been caught just for
+ bp_longjmp_call_dummy. */
+ struct frame_id initiating_frame;
/* Private data used by the target vector implementation. */
struct private_thread_info *private;
+
+ /* Function that is called to free PRIVATE. If this is NULL, then
+ xfree will be called on PRIVATE. */
+ void (*private_dtor) (struct private_thread_info *);
};
/* Create an empty thread list, or empty the existing one. */
extern void init_thread_list (void);
-/* Add a thread to the thread list.
- Note that add_thread now returns the handle of the new thread,
- so that the caller may initialize the private thread data. */
+/* Add a thread to the thread list, print a message
+ 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);
+/* 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, and sets the private info. */
+extern struct thread_info *add_thread_with_info (ptid_t ptid,
+ struct private_thread_info *);
+
/* Delete an existing thread list entry. */
extern void delete_thread (ptid_t);
-/* Delete a step_resume_breakpoint from the thread database. */
-extern void delete_step_resume_breakpoint (void *);
+/* Delete an existing thread list entry, and be quiet about it. Used
+ after the process this thread having belonged to having already
+ exited, for example. */
+extern void delete_thread_silent (ptid_t);
+
+/* Delete a step_resume_breakpoint from the thread database. */
+extern void delete_step_resume_breakpoint (struct thread_info *);
+
+/* Delete an exception_resume_breakpoint from the thread database. */
+extern void delete_exception_resume_breakpoint (struct thread_info *);
/* Translate the integer thread id (GDB's homegrown id, not the system's)
into a "pid" (which may be overloaded with extra thread information). */
extern int valid_thread_id (int thread);
/* Search function to lookup a thread by 'pid'. */
-extern struct thread_info *find_thread_pid (ptid_t ptid);
+extern struct thread_info *find_thread_ptid (ptid_t ptid);
+
+/* Find thread by GDB user-visible thread number. */
+struct thread_info *find_thread_id (int num);
+
+/* Finds the first thread of the inferior given by PID. If PID is -1,
+ returns the first thread in the list. */
+struct thread_info *first_thread_of_process (int pid);
+
+/* Returns any thread of process PID. */
+extern struct thread_info *any_thread_of_process (int pid);
+
+/* Returns any non-exited thread of process PID, giving preference for
+ not executing threads. */
+extern struct thread_info *any_live_thread_of_process (int pid);
+
+/* Change the ptid of thread OLD_PTID to NEW_PTID. */
+void thread_change_ptid (ptid_t old_ptid, ptid_t new_ptid);
/* Iterator function to call a user-provided callback function
once for each known thread. */
typedef int (*thread_callback_func) (struct thread_info *, void *);
extern struct thread_info *iterate_over_threads (thread_callback_func, void *);
-/* infrun context switch: save the debugger state for the given thread. */
-extern void save_infrun_state (ptid_t ptid,
- CORE_ADDR prev_pc,
- char *prev_func_name,
- int trap_expected,
- struct breakpoint *step_resume_breakpoint,
- struct breakpoint *through_sigtramp_breakpoint,
- CORE_ADDR step_range_start,
- CORE_ADDR step_range_end,
- const struct frame_id *step_frame_id,
- int handling_longjmp,
- int another_trap,
- int stepping_through_solib_after_catch,
- bpstat stepping_through_solib_catchpoints,
- int stepping_through_sigtramp,
- int current_line,
- struct symtab *current_symtab,
- CORE_ADDR step_sp);
-
-/* infrun context switch: load the debugger state previously saved
- for the given thread. */
-extern void load_infrun_state (ptid_t ptid,
- CORE_ADDR *prev_pc,
- char **prev_func_name,
- int *trap_expected,
- struct breakpoint **step_resume_breakpoint,
- struct breakpoint **through_sigtramp_breakpoint,
- CORE_ADDR *step_range_start,
- CORE_ADDR *step_range_end,
- struct frame_id *step_frame_id,
- int *handling_longjmp,
- int *another_trap,
- int *stepping_through_solib_affter_catch,
- bpstat *stepping_through_solib_catchpoints,
- int *stepping_through_sigtramp,
- int *current_line,
- struct symtab **current_symtab,
- CORE_ADDR *step_sp);
+extern int thread_count (void);
+
+/* Switch from one thread to another. */
+extern void switch_to_thread (ptid_t ptid);
+
+/* Marks thread PTID is running, or stopped.
+ If PIDGET (PTID) is -1, 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
+ 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);
+
+/* In the frontend's perpective is there any thread running? */
+extern int any_running (void);
+
+/* Marks thread PTID as executing, or not. If PIDGET (PTID) is -1,
+ marks all threads.
+
+ 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);
+
+/* Reports if thread PTID is executing. */
+extern int is_executing (ptid_t ptid);
+
+/* Merge the executing property of thread PTID over to its thread
+ state property (frontend running/stopped view).
+
+ "not executing" -> "stopped"
+ "executing" -> "running"
+ "exited" -> "exited"
+
+ If PIDGET (PTID) is -1, go over all threads.
+
+ Notifications are only emitted if the thread state did change. */
+extern void finish_thread_state (ptid_t ptid);
+
+/* Same as FINISH_THREAD_STATE, but with an interface suitable to be
+ registered as a cleanup. PTID_P points to the ptid_t that is
+ passed to FINISH_THREAD_STATE. */
+extern void finish_thread_state_cleanup (void *ptid_p);
/* 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 void print_thread_info (struct ui_out *uiout, char *threads,
+ int pid);
+
+extern struct cleanup *make_cleanup_restore_current_thread (void);
+
+/* Returns a pointer into the thread_info corresponding to
+ INFERIOR_PTID. INFERIOR_PTID *must* be in the thread list. */
+extern struct thread_info* inferior_thread (void);
+
+extern void update_thread_list (void);
+
#endif /* GDBTHREAD_H */
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