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/* Multi-process/thread control for GDB, the GNU debugger.

   Copyright (C) 1986, 1987, 1988, 1993, 1994, 1995, 1996, 1997, 1998, 1999,

   2000, 2001, 2002, 2003, 2004, 2007, 2008 Free Software Foundation, Inc.

   Contributed by Lynx Real-Time Systems, Inc.  Los Gatos, CA.

   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/>.  */

#include "defs.h"

#include "symtab.h"

#include "frame.h"

#include "inferior.h"

#include "environ.h"

#include "value.h"

#include "target.h"

#include "gdbthread.h"

#include "exceptions.h"

#include "command.h"

#include "gdbcmd.h"

#include "regcache.h"

#include "gdb.h"

#include "gdb_string.h"

#include <ctype.h>

#include <sys/types.h>

#include <signal.h>

#include "ui-out.h"

/* Definition of struct thread_info exported to gdbthread.h */

/* Prototypes for exported functions. */

void _initialize_thread (void);

/* Prototypes for local functions. */

static struct thread_info *thread_list = NULL;

static int highest_thread_num;

static struct thread_info *find_thread_id (int num);

static void thread_command (char *tidstr, int from_tty);

static void thread_apply_all_command (char *, int);

static int thread_alive (struct thread_info *);

static void info_threads_command (char *, int);

static void thread_apply_command (char *, int);

static void restore_current_thread (ptid_t);

static void prune_threads (void);

static struct cleanup *make_cleanup_restore_current_thread (ptid_t,

                                                            struct frame_id);

void

delete_step_resume_breakpoint (void *arg)

{

  struct breakpoint **breakpointp = (struct breakpoint **) arg;

  struct thread_info *tp;

  if (*breakpointp != NULL)

    {

      delete_breakpoint (*breakpointp);

      for (tp = thread_list; tp; tp = tp->next)

        if (tp->step_resume_breakpoint == *breakpointp)

          tp->step_resume_breakpoint = NULL;

      *breakpointp = NULL;

    }

}

static void

free_thread (struct thread_info *tp)

{

  /* NOTE: this will take care of any left-over step_resume breakpoints,

     but not any user-specified thread-specific breakpoints.  We can not

     delete the breakpoint straight-off, because the inferior might not

     be stopped at the moment.  */

  if (tp->step_resume_breakpoint)

    tp->step_resume_breakpoint->disposition = disp_del_at_next_stop;

  /* FIXME: do I ever need to call the back-end to give it a

     chance at this private data before deleting the thread?  */

  if (tp->private)

    xfree (tp->private);

  xfree (tp);

}

void

init_thread_list (void)

{

  struct thread_info *tp, *tpnext;

  highest_thread_num = 0;

  if (!thread_list)

    return;

  for (tp = thread_list; tp; tp = tpnext)

    {

      tpnext = tp->next;

      free_thread (tp);

    }

  thread_list = NULL;

}

struct thread_info *

add_thread_silent (ptid_t ptid)

{

  struct thread_info *tp;

  tp = (struct thread_info *) xmalloc (sizeof (*tp));

  memset (tp, 0, sizeof (*tp));

  tp->ptid = ptid;

  tp->num = ++highest_thread_num;

  tp->next = thread_list;

  thread_list = tp;

  return tp;

}

struct thread_info *

add_thread (ptid_t ptid)

{

  struct thread_info *result = add_thread_silent (ptid);

  if (print_thread_events)

    printf_unfiltered (_("[New %s]\n"), target_pid_to_str (ptid));

  return result;

}

void

delete_thread (ptid_t ptid)

{

  struct thread_info *tp, *tpprev;

  tpprev = NULL;

  for (tp = thread_list; tp; tpprev = tp, tp = tp->next)

    if (ptid_equal (tp->ptid, ptid))

      break;

  if (!tp)

    return;

  if (tpprev)

    tpprev->next = tp->next;

  else

    thread_list = tp->next;

  free_thread (tp);

}

static struct thread_info *

find_thread_id (int num)

{

  struct thread_info *tp;

  for (tp = thread_list; tp; tp = tp->next)

    if (tp->num == num)

      return tp;

  return NULL;

}

/* Find a thread_info by matching PTID.  */

struct thread_info *

find_thread_pid (ptid_t ptid)

{

  struct thread_info *tp;

  for (tp = thread_list; tp; tp = tp->next)

    if (ptid_equal (tp->ptid, ptid))

      return tp;

  return NULL;

}

/*

 * Thread iterator function.

 *

 * Calls a callback function once for each thread, so long as

 * the callback function returns false.  If the callback function

 * returns true, the iteration will end and the current thread

 * will be returned.  This can be useful for implementing a

 * search for a thread with arbitrary attributes, or for applying

 * some operation to every thread.

 *

 * FIXME: some of the existing functionality, such as

 * "Thread apply all", might be rewritten using this functionality.

 */

struct thread_info *

iterate_over_threads (int (*callback) (struct thread_info *, void *),

                      void *data)

{

  struct thread_info *tp;

  for (tp = thread_list; tp; tp = tp->next)

    if ((*callback) (tp, data))

      return tp;

  return NULL;

}

int

valid_thread_id (int num)

{

  struct thread_info *tp;

  for (tp = thread_list; tp; tp = tp->next)

    if (tp->num == num)

      return 1;

  return 0;

}

int

pid_to_thread_id (ptid_t ptid)

{

  struct thread_info *tp;

  for (tp = thread_list; tp; tp = tp->next)

    if (ptid_equal (tp->ptid, ptid))

      return tp->num;

  return 0;

}

ptid_t

thread_id_to_pid (int num)

{

  struct thread_info *thread = find_thread_id (num);

  if (thread)

    return thread->ptid;

  else

    return pid_to_ptid (-1);

}

int

in_thread_list (ptid_t ptid)

{

  struct thread_info *tp;

  for (tp = thread_list; tp; tp = tp->next)

    if (ptid_equal (tp->ptid, ptid))

      return 1;

  return 0;                      /* Never heard of 'im */

}

/* Print a list of thread ids currently known, and the total number of

   threads. To be used from within catch_errors. */

static int

do_captured_list_thread_ids (struct ui_out *uiout, void *arg)

{

  struct thread_info *tp;

  int num = 0;

  struct cleanup *cleanup_chain;

  prune_threads ();

  target_find_new_threads ();

  cleanup_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "thread-ids");

  for (tp = thread_list; tp; tp = tp->next)

    {

      num++;

      ui_out_field_int (uiout, "thread-id", tp->num);

    }

  do_cleanups (cleanup_chain);

  ui_out_field_int (uiout, "number-of-threads", num);

  return GDB_RC_OK;

}

/* Official gdblib interface function to get a list of thread ids and

   the total number. */

enum gdb_rc

gdb_list_thread_ids (struct ui_out *uiout, char **error_message)

{

  if (catch_exceptions_with_msg (uiout, do_captured_list_thread_ids, NULL,

                                 error_message, RETURN_MASK_ALL) < 0)

    return GDB_RC_FAIL;

  return GDB_RC_OK;

}

/* Load infrun state for the thread PID.  */

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 *stepping_over_breakpoint,

                   int *stepping_through_solib_after_catch,

                   bpstat *stepping_through_solib_catchpoints,

                   int *current_line,

                   struct symtab **current_symtab)

{

  struct thread_info *tp;

  /* If we can't find the thread, then we're debugging a single threaded

     process.  No need to do anything in that case.  */

  tp = find_thread_id (pid_to_thread_id (ptid));

  if (tp == NULL)

    return;

  *prev_pc = tp->prev_pc;

  *trap_expected = tp->trap_expected;

  *step_resume_breakpoint = tp->step_resume_breakpoint;

  *step_range_start = tp->step_range_start;

  *step_range_end = tp->step_range_end;

  *step_frame_id = tp->step_frame_id;

  *handling_longjmp = tp->handling_longjmp;

  *stepping_over_breakpoint = tp->stepping_over_breakpoint;

  *stepping_through_solib_after_catch =

    tp->stepping_through_solib_after_catch;

  *stepping_through_solib_catchpoints =

    tp->stepping_through_solib_catchpoints;

  *current_line = tp->current_line;

  *current_symtab = tp->current_symtab;

}

/* Save infrun state for the thread PID.  */

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 stepping_over_breakpoint,

                   int stepping_through_solib_after_catch,

                   bpstat stepping_through_solib_catchpoints,

                   int current_line,

                   struct symtab *current_symtab)

{

  struct thread_info *tp;

  /* If we can't find the thread, then we're debugging a single-threaded

     process.  Nothing to do in that case.  */

  tp = find_thread_id (pid_to_thread_id (ptid));

  if (tp == NULL)

    return;

  tp->prev_pc = prev_pc;

  tp->trap_expected = trap_expected;

  tp->step_resume_breakpoint = step_resume_breakpoint;

  tp->step_range_start = step_range_start;

  tp->step_range_end = step_range_end;

  tp->step_frame_id = (*step_frame_id);

  tp->handling_longjmp = handling_longjmp;

  tp->stepping_over_breakpoint = stepping_over_breakpoint;

  tp->stepping_through_solib_after_catch = stepping_through_solib_after_catch;

  tp->stepping_through_solib_catchpoints = stepping_through_solib_catchpoints;

  tp->current_line = current_line;

  tp->current_symtab = current_symtab;

}

/* Return true if TP is an active thread. */

static int

thread_alive (struct thread_info *tp)

{

  if (PIDGET (tp->ptid) == -1)

    return 0;

  if (!target_thread_alive (tp->ptid))

    {

      tp->ptid = pid_to_ptid (-1);      /* Mark it as dead */

      return 0;

    }

  return 1;

}

static void

prune_threads (void)

{

  struct thread_info *tp, *next;

  for (tp = thread_list; tp; tp = next)

    {

      next = tp->next;

      if (!thread_alive (tp))

        delete_thread (tp->ptid);

    }

}

/* Print information about currently known threads

 * Note: this has the drawback that it _really_ switches

 *       threads, which frees the frame cache.  A no-side

 *       effects info-threads command would be nicer.

 */

static void

info_threads_command (char *arg, int from_tty)

{

  struct thread_info *tp;

  ptid_t current_ptid;

  struct frame_info *cur_frame;

  struct cleanup *old_chain;

  struct frame_id saved_frame_id;

  char *extra_info;

  /* Backup current thread and selected frame.  */

  saved_frame_id = get_frame_id (get_selected_frame (NULL));

  old_chain = make_cleanup_restore_current_thread (inferior_ptid, saved_frame_id);

  prune_threads ();

  target_find_new_threads ();

  current_ptid = inferior_ptid;

  for (tp = thread_list; tp; tp = tp->next)

    {

      if (ptid_equal (tp->ptid, current_ptid))

        printf_filtered ("* ");

      else

        printf_filtered ("  ");

      printf_filtered ("%d %s", tp->num, target_tid_to_str (tp->ptid));

      extra_info = target_extra_thread_info (tp);

      if (extra_info)

        printf_filtered (" (%s)", extra_info);

      puts_filtered ("  ");

      /* That switch put us at the top of the stack (leaf frame).  */

      switch_to_thread (tp->ptid);

      print_stack_frame (get_selected_frame (NULL), 0, LOCATION);

    }

  /* Restores the current thread and the frame selected before

     the "info threads" command.  */

  do_cleanups (old_chain);

  /*  If case we were not able to find the original frame, print the

      new selected frame.  */

  if (frame_find_by_id (saved_frame_id) == NULL)

    {

      warning (_("Couldn't restore frame in current thread, at frame 0"));

      print_stack_frame (get_selected_frame (NULL), 0, LOCATION);

    }

}

/* Switch from one thread to another. */

void

switch_to_thread (ptid_t ptid)

{

  if (ptid_equal (ptid, inferior_ptid))

    return;

  inferior_ptid = ptid;

  reinit_frame_cache ();

  registers_changed ();

  stop_pc = read_pc ();

}

static void

restore_current_thread (ptid_t ptid)

{

  if (!ptid_equal (ptid, inferior_ptid))

    {

      switch_to_thread (ptid);

    }

}

static void

restore_selected_frame (struct frame_id a_frame_id)

{

  struct frame_info *selected_frame_info = NULL;

  if (frame_id_eq (a_frame_id, null_frame_id))

    return;

  if ((selected_frame_info = frame_find_by_id (a_frame_id)) != NULL)

    {

      select_frame (selected_frame_info);

    }

}

struct current_thread_cleanup

{

  ptid_t inferior_ptid;

  struct frame_id selected_frame_id;

};

static void

do_restore_current_thread_cleanup (void *arg)

{

  struct current_thread_cleanup *old = arg;

  restore_current_thread (old->inferior_ptid);

  restore_selected_frame (old->selected_frame_id);

  xfree (old);

}

static struct cleanup *

make_cleanup_restore_current_thread (ptid_t inferior_ptid,

                                     struct frame_id a_frame_id)

{

  struct current_thread_cleanup *old

    = xmalloc (sizeof (struct current_thread_cleanup));

  old->inferior_ptid = inferior_ptid;

  old->selected_frame_id = a_frame_id;

  return make_cleanup (do_restore_current_thread_cleanup, old);

}

/* Apply a GDB command to a list of threads.  List syntax is a whitespace

   seperated list of numbers, or ranges, or the keyword `all'.  Ranges consist

   of two numbers seperated by a hyphen.  Examples:

   thread apply 1 2 7 4 backtrace       Apply backtrace cmd to threads 1,2,7,4

   thread apply 2-7 9 p foo(1)  Apply p foo(1) cmd to threads 2->7 & 9

   thread apply all p x/i $pc   Apply x/i $pc cmd to all threads

 */

static void

thread_apply_all_command (char *cmd, int from_tty)

{

  struct thread_info *tp;

  struct cleanup *old_chain;

  struct cleanup *saved_cmd_cleanup_chain;

  char *saved_cmd;

  struct frame_id saved_frame_id;

  ptid_t current_ptid;

  int thread_has_changed = 0;

  if (cmd == NULL || *cmd == '\000')

    error (_("Please specify a command following the thread ID list"));

  current_ptid = inferior_ptid;

  saved_frame_id = get_frame_id (get_selected_frame (NULL));

  old_chain = make_cleanup_restore_current_thread (inferior_ptid, saved_frame_id);

  /* It is safe to update the thread list now, before

     traversing it for "thread apply all".  MVS */

  target_find_new_threads ();

  /* Save a copy of the command in case it is clobbered by

     execute_command */

  saved_cmd = xstrdup (cmd);

  saved_cmd_cleanup_chain = make_cleanup (xfree, (void *) saved_cmd);

  for (tp = thread_list; tp; tp = tp->next)

    if (thread_alive (tp))

      {

        switch_to_thread (tp->ptid);

        printf_filtered (_("\nThread %d (%s):\n"),

                         tp->num, target_tid_to_str (inferior_ptid));

        execute_command (cmd, from_tty);

        strcpy (cmd, saved_cmd);        /* Restore exact command used previously */

      }

  if (!ptid_equal (current_ptid, inferior_ptid))

    thread_has_changed = 1;

  do_cleanups (saved_cmd_cleanup_chain);

  do_cleanups (old_chain);

  /* Print stack frame only if we changed thread.  */

  if (thread_has_changed)

    print_stack_frame (get_current_frame (), 1, SRC_LINE);

}

static void

thread_apply_command (char *tidlist, int from_tty)

{

  char *cmd;

  char *p;

  struct cleanup *old_chain;

  struct cleanup *saved_cmd_cleanup_chain;

  char *saved_cmd;

  struct frame_id saved_frame_id;

  ptid_t current_ptid;

  int thread_has_changed = 0;

  if (tidlist == NULL || *tidlist == '\000')

    error (_("Please specify a thread ID list"));

  for (cmd = tidlist; *cmd != '\000' && !isalpha (*cmd); cmd++);

  if (*cmd == '\000')

    error (_("Please specify a command following the thread ID list"));

  current_ptid = inferior_ptid;

  saved_frame_id = get_frame_id (get_selected_frame (NULL));

  old_chain = make_cleanup_restore_current_thread (inferior_ptid, saved_frame_id);

  /* Save a copy of the command in case it is clobbered by

     execute_command */

  saved_cmd = xstrdup (cmd);

  saved_cmd_cleanup_chain = make_cleanup (xfree, (void *) saved_cmd);

  while (tidlist < cmd)

    {

      struct thread_info *tp;

      int start, end;

      start = strtol (tidlist, &p, 10);

      if (p == tidlist)

        error (_("Error parsing %s"), tidlist);

      tidlist = p;

      while (*tidlist == ' ' || *tidlist == '\t')

        tidlist++;

      if (*tidlist == '-')      /* Got a range of IDs? */

        {

          tidlist++;            /* Skip the - */

          end = strtol (tidlist, &p, 10);

          if (p == tidlist)

            error (_("Error parsing %s"), tidlist);

          tidlist = p;

          while (*tidlist == ' ' || *tidlist == '\t')

            tidlist++;

        }

      else

        end = start;

      for (; start <= end; start++)

        {

          tp = find_thread_id (start);

          if (!tp)

            warning (_("Unknown thread %d."), start);

          else if (!thread_alive (tp))

            warning (_("Thread %d has terminated."), start);

          else

            {

              switch_to_thread (tp->ptid);

              printf_filtered (_("\nThread %d (%s):\n"), tp->num,

                               target_tid_to_str (inferior_ptid));

              execute_command (cmd, from_tty);

              strcpy (cmd, saved_cmd);  /* Restore exact command used previously */

            }

        }

    }

  if (!ptid_equal (current_ptid, inferior_ptid))

    thread_has_changed = 1;

  do_cleanups (saved_cmd_cleanup_chain);

  do_cleanups (old_chain);

  /* Print stack frame only if we changed thread.  */

  if (thread_has_changed)

    print_stack_frame (get_current_frame (), 1, SRC_LINE);

}

/* Switch to the specified thread.  Will dispatch off to thread_apply_command

   if prefix of arg is `apply'.  */

static void

thread_command (char *tidstr, int from_tty)

{

  if (!tidstr)

    {

      /* Don't generate an error, just say which thread is current. */

      if (target_has_stack)

        printf_filtered (_("[Current thread is %d (%s)]\n"),

                         pid_to_thread_id (inferior_ptid),

                         target_tid_to_str (inferior_ptid));

      else

        error (_("No stack."));

      return;

    }

  gdb_thread_select (uiout, tidstr, NULL);

}

/* Print notices when new threads are attached and detached.  */

int print_thread_events = 1;

static void

show_print_thread_events (struct ui_file *file, int from_tty,

                          struct cmd_list_element *c, const char *value)

{

  fprintf_filtered (file, _("\

Printing of thread events is %s.\n"),

                    value);