if we detect it exiting. */
int refcount;
- /* State from wait_for_inferior */
- CORE_ADDR prev_pc;
+ /* User/external stepping state. */
+
+ /* Step-resume or longjmp-resume breakpoint. */
struct breakpoint *step_resume_breakpoint;
- CORE_ADDR step_range_start;
- CORE_ADDR step_range_end;
+
+ /* 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;
int current_line;
struct symtab *current_symtab;
+
+ /* Internal stepping state. */
+
+ /* 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;
+
+ /* 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;
+
+ /* 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. */
+ int step_after_step_resume_breakpoint;
+
/* 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
when we finally do stop stepping. */
bpstat stepping_through_solib_catchpoints;
- /* The below are only per-thread in non-stop mode. */
/* 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;
+
+ /* 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;
+
enum step_over_calls_kind step_over_calls;
+
+ /* Nonzero if stopped due to a step command. */
int stop_step;
+
+ /* 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;
+ /* Last signal that the inferior received (why it stopped). */
enum target_signal stop_signal;
- /* Used in continue_command to set the proceed count of the
- breakpoint the thread stopped at. */
+
+ /* Chain containing status of breakpoint(s) the thread stopped
+ at. */
bpstat stop_bpstat;
/* Private data used by the target vector implementation. */
extern void delete_thread_silent (ptid_t);
/* Delete a step_resume_breakpoint from the thread database. */
-extern void delete_step_resume_breakpoint (void *);
+extern void delete_step_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). */
/* Find thread by GDB user-visible thread number. */
struct thread_info *find_thread_id (int num);
+/* 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 int thread_count (void);
-/* infrun context switch: save the debugger state for the given thread. */
-extern void save_infrun_state (ptid_t ptid,
- CORE_ADDR prev_pc,
- int trap_expected,
- struct breakpoint *step_resume_breakpoint,
- CORE_ADDR step_range_start,
- CORE_ADDR step_range_end,
- const struct frame_id *step_frame_id,
- int another_trap,
- int stepping_through_solib_after_catch,
- bpstat stepping_through_solib_catchpoints,
- int current_line,
- struct symtab *current_symtab,
- struct continuation *continuations,
- struct continuation *intermediate_continuations,
- int proceed_to_finish,
- enum step_over_calls_kind step_over_calls,
- int stop_step,
- int step_multi,
- enum target_signal stop_signal,
- bpstat stop_bpstat);
-
-/* 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,
- int *trap_expected,
- struct breakpoint **step_resume_breakpoint,
- CORE_ADDR *step_range_start,
- CORE_ADDR *step_range_end,
- struct frame_id *step_frame_id,
- int *another_trap,
- int *stepping_through_solib_after_catch,
- bpstat *stepping_through_solib_catchpoints,
- int *current_line,
- struct symtab **current_symtab,
- struct continuation **continuations,
- struct continuation **intermediate_continuations,
- int *proceed_to_finish,
- enum step_over_calls_kind *step_over_calls,
- int *stop_step,
- int *step_multi,
- enum target_signal *stop_signal,
- bpstat *stop_bpstat);
-
/* Switch from one thread to another. */
extern void switch_to_thread (ptid_t ptid);
If PIDGET (PTID) is -1, marks all threads. */
extern void set_running (ptid_t ptid, int running);
-/* Reports if thread PTID is known to be running right now. */
-extern int is_running (ptid_t ptid);
+/* 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,
-/* Reports if any thread is known to be running right now. */
-extern int any_running (void);
+ 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);
-/* Is this thread stopped? */
+/* In the frontend's perpective, is this thread stopped? */
extern int is_stopped (ptid_t ptid);
-/* Marks thread PTID as executing, or as stopped.
- If PIDGET (PTID) is -1, marks all threads. */
+/* 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 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);
#endif /* GDBTHREAD_H */
projects / deliverable / binutils-gdb.git / blobdiff