X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Fgdbthread.h;h=2f388fb2994346e991f0a32badbb55b73c5bcfb0;hb=957f3f49de19d92c755ccc59e36fffc1f65afd63;hp=b6ccc4ff671394c60561b4104cefb270c2dd1edc;hpb=01f0fe5e0450edf168c1f612feb93cf588e4e7ea;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/gdbthread.h b/gdb/gdbthread.h index b6ccc4ff67..2f388fb299 100644 --- a/gdb/gdbthread.h +++ b/gdb/gdbthread.h @@ -1,7 +1,6 @@ /* Multi-process/thread control defs for GDB, the GNU debugger. Copyright (C) 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1997, 1998, 1999, - 2000 - Free Software Foundation, Inc. + 2000, 2007, 2008, 2009 Free Software Foundation, Inc. Contributed by Lynx Real-Time Systems, Inc. Los Gatos, CA. @@ -9,7 +8,7 @@ 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, @@ -18,22 +17,17 @@ 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., 51 Franklin Street, Fifth Floor, - Boston, MA 02110-1301, USA. */ + along with this program. If not, see . */ #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" struct thread_info { @@ -42,17 +36,99 @@ 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; + + /* 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. */ + /* This field is internal to thread.c. Never access it directly, + use is_executing instead. */ + 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 ... } */ + /* This field is internal to thread.c. Never access it directly, + use is_running instead. */ + 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; + + /* 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; + + /* Similarly, the frame ID of the underlying stack frame (skipping + any inlined frames). */ + struct frame_id step_stack_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; - int handling_longjmp; - int another_trap; + + /* 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 @@ -65,6 +141,50 @@ struct thread_info when we finally do stop stepping. */ bpstat stepping_through_solib_catchpoints; + /* 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; + + /* 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; + + /* 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; + + /* Last signal that the inferior received (why it stopped). */ + enum target_signal stop_signal; + + /* Chain containing status of breakpoint(s) the thread stopped + at. */ + bpstat stop_bpstat; + + /* True if this thread has been explicitly requested to stop. */ + int stop_requested; + /* Private data used by the target vector implementation. */ struct private_thread_info *private; }; @@ -72,16 +192,30 @@ struct 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 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 (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). */ @@ -100,45 +234,116 @@ extern int in_thread_list (ptid_t ptid); 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 + already stopped 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, - 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 handling_longjmp, - int another_trap, - int stepping_through_solib_after_catch, - bpstat stepping_through_solib_catchpoints, - int current_line, - struct symtab *current_symtab); - -/* 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 *handling_longjmp, - int *another_trap, - int *stepping_through_solib_affter_catch, - bpstat *stepping_through_solib_catchpoints, - int *current_line, - struct symtab **current_symtab); +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, int thread, + 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); + #endif /* GDBTHREAD_H */