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

   Copyright 1986, 1987, 1988, 1993, 1998, 1999, 2000

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

   Free Software Foundation, Inc.

   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 2 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, write to the Free Software

   Foundation, Inc., 59 Temple Place - Suite 330,

   Boston, MA 02111-1307, USA.  */

#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 "command.h"

#include "gdbcmd.h"

#include <ctype.h>

#include <sys/types.h>

#include <signal.h>

#ifdef UI_OUT

#include "ui-out.h"

#endif

/*#include "lynxos-core.h" */

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

/* Prototypes for exported functions. */

void _initialize_thread PARAMS ((void));

/* Prototypes for local functions. */

static struct thread_info *thread_list = NULL;

static int highest_thread_num;

static struct thread_info *find_thread_id PARAMS ((int num));

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

static void thread_apply_all_command PARAMS ((char *, int));

static int thread_alive PARAMS ((struct thread_info *));

static void info_threads_command PARAMS ((char *, int));

static void thread_apply_command PARAMS ((char *, int));

static void restore_current_thread PARAMS ((int));

static void switch_to_thread PARAMS ((int pid));

static void prune_threads PARAMS ((void));

void

init_thread_list ()

{

  struct thread_info *tp, *tpnext;

  if (!thread_list)

    return;

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

    {

      tpnext = tp->next;

      free (tp);

    }

  thread_list = NULL;

  highest_thread_num = 0;

}

/* add_thread now returns a pointer to the new thread_info,

   so that back_ends can initialize their private data.  */

struct thread_info *

add_thread (pid)

     int pid;

{

  struct thread_info *tp;

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

  tp->pid = pid;

  tp->num = ++highest_thread_num;

  tp->prev_pc = 0;

  tp->prev_func_start = 0;

  tp->prev_func_name = NULL;

  tp->step_range_start = 0;

  tp->step_range_end = 0;

  tp->step_frame_address = 0;

  tp->step_resume_breakpoint = 0;

  tp->through_sigtramp_breakpoint = 0;

  tp->handling_longjmp = 0;

  tp->trap_expected = 0;

  tp->another_trap = 0;

  tp->stepping_through_solib_after_catch = 0;

  tp->stepping_through_solib_catchpoints = NULL;

  tp->stepping_through_sigtramp = 0;

  tp->next = thread_list;

  tp->private = NULL;

  thread_list = tp;

  return tp;

}

void

delete_thread (pid)

     int pid;

{

  struct thread_info *tp, *tpprev;

  tpprev = NULL;

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

    if (tp->pid == pid)

      break;

  if (!tp)

    return;

  if (tpprev)

    tpprev->next = tp->next;

  else

    thread_list = tp->next;

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

     but not any user-specified thread-specific breakpoints. */

  if (tp->step_resume_breakpoint)

    delete_breakpoint (tp->step_resume_breakpoint);

  /* 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)

    free (tp->private);

  free (tp);

  return;

}

static struct thread_info *

find_thread_id (num)

     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 'pid'.  */

struct thread_info *

find_thread_pid (pid)

     int pid;

{

  struct thread_info *tp;

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

    if (tp->pid == pid)

      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 (callback, data)

     int (*callback) ();

     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 (num)

     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 (pid)

     int pid;

{

  struct thread_info *tp;

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

    if (tp->pid == pid)

      return tp->num;

  return 0;

}

int

thread_id_to_pid (num)

     int num;

{

  struct thread_info *thread = find_thread_id (num);

  if (thread)

    return thread->pid;

  else

    return -1;

}

int

in_thread_list (pid)

     int pid;

{

  struct thread_info *tp;

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

    if (tp->pid == pid)

      return 1;

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

}

#ifdef UI_OUT

/* 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 (void *arg)

{

  struct thread_info *tp;

  int num = 0;

  ui_out_list_begin (uiout, "thread-ids");

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

    {

      num++;

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

    }

  ui_out_list_end (uiout);

  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 (/* output object */)

{

  return catch_errors (do_captured_list_thread_ids, NULL,

                       NULL, RETURN_MASK_ALL);

}

#endif

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

void

load_infrun_state (pid, prev_pc, prev_func_start, prev_func_name,

                   trap_expected, step_resume_breakpoint,

                   through_sigtramp_breakpoint, step_range_start,

                   step_range_end, step_frame_address,

                   handling_longjmp, another_trap,

                   stepping_through_solib_after_catch,

                   stepping_through_solib_catchpoints,

                   stepping_through_sigtramp)

     int pid;

     CORE_ADDR *prev_pc;

     CORE_ADDR *prev_func_start;

     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;

     CORE_ADDR *step_frame_address;

     int *handling_longjmp;

     int *another_trap;

     int *stepping_through_solib_after_catch;

     bpstat *stepping_through_solib_catchpoints;

     int *stepping_through_sigtramp;

{

  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 (pid));

  if (tp == NULL)

    return;

  *prev_pc = tp->prev_pc;

  *prev_func_start = tp->prev_func_start;

  *prev_func_name = tp->prev_func_name;

  *step_resume_breakpoint = tp->step_resume_breakpoint;

  *step_range_start = tp->step_range_start;

  *step_range_end = tp->step_range_end;

  *step_frame_address = tp->step_frame_address;

  *through_sigtramp_breakpoint = tp->through_sigtramp_breakpoint;

  *handling_longjmp = tp->handling_longjmp;

  *trap_expected = tp->trap_expected;

  *another_trap = tp->another_trap;

  *stepping_through_solib_after_catch = tp->stepping_through_solib_after_catch;

  *stepping_through_solib_catchpoints = tp->stepping_through_solib_catchpoints;

  *stepping_through_sigtramp = tp->stepping_through_sigtramp;

}

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

void

save_infrun_state (pid, prev_pc, prev_func_start, prev_func_name,

                   trap_expected, step_resume_breakpoint,

                   through_sigtramp_breakpoint, step_range_start,

                   step_range_end, step_frame_address,

                   handling_longjmp, another_trap,

                   stepping_through_solib_after_catch,

                   stepping_through_solib_catchpoints,

                   stepping_through_sigtramp)

     int pid;

     CORE_ADDR prev_pc;

     CORE_ADDR prev_func_start;

     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;

     CORE_ADDR step_frame_address;

     int handling_longjmp;

     int another_trap;

     int stepping_through_solib_after_catch;

     bpstat stepping_through_solib_catchpoints;

     int stepping_through_sigtramp;

{

  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 (pid));

  if (tp == NULL)

    return;

  tp->prev_pc = prev_pc;

  tp->prev_func_start = prev_func_start;

  tp->prev_func_name = prev_func_name;

  tp->step_resume_breakpoint = step_resume_breakpoint;

  tp->step_range_start = step_range_start;

  tp->step_range_end = step_range_end;

  tp->step_frame_address = step_frame_address;

  tp->through_sigtramp_breakpoint = through_sigtramp_breakpoint;

  tp->handling_longjmp = handling_longjmp;

  tp->trap_expected = trap_expected;

  tp->another_trap = another_trap;

  tp->stepping_through_solib_after_catch = stepping_through_solib_after_catch;

  tp->stepping_through_solib_catchpoints = stepping_through_solib_catchpoints;

  tp->stepping_through_sigtramp = stepping_through_sigtramp;

}

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

static int

thread_alive (tp)

     struct thread_info *tp;

{

  if (tp->pid == -1)

    return 0;

  if (!target_thread_alive (tp->pid))

    {

      tp->pid = -1;             /* Mark it as dead */

      return 0;

    }

  return 1;

}

static void

prune_threads ()

{

  struct thread_info *tp, *next;

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

    {

      next = tp->next;

      if (!thread_alive (tp))

        delete_thread (tp->pid);

    }

}

/* 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 (arg, from_tty)

     char *arg;

     int from_tty;

{

  struct thread_info *tp;

  int current_pid;

  struct frame_info *cur_frame;

  int saved_frame_level = selected_frame_level;

  int counter;

  char *extra_info;

  /* Avoid coredumps which would happen if we tried to access a NULL

     selected_frame.  */

  if (!target_has_stack)

    error ("No stack.");

  prune_threads ();

  target_find_new_threads ();

  current_pid = inferior_pid;

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

    {

      if (tp->pid == current_pid)

        printf_filtered ("* ");

      else

        printf_filtered ("  ");

#ifdef HPUXHPPA

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

#else

      printf_filtered ("%d %s", tp->num, target_pid_to_str (tp->pid));

#endif

      extra_info = target_extra_thread_info (tp);

      if (extra_info)

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

      puts_filtered ("  ");

      switch_to_thread (tp->pid);

      if (selected_frame)

        print_only_stack_frame (selected_frame, -1, 0);

      else

        printf_filtered ("[No stack.]\n");

    }

  switch_to_thread (current_pid);

  /* Code below copied from "up_silently_base" in "stack.c".

   * It restores the frame set by the user before the "info threads"

   * command.  We have finished the info-threads display by switching

   * back to the current thread.  That switch has put us at the top

   * of the stack (leaf frame).

   */

  counter = saved_frame_level;

  cur_frame = find_relative_frame (selected_frame, &counter);

  if (counter != 0)

    {

      /* Ooops, can't restore, tell user where we are. */

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

      print_stack_frame (selected_frame, -1, 0);

    }

  else

    {

      select_frame (cur_frame, saved_frame_level);

    }

  /* re-show current frame. */

  show_stack_frame (cur_frame);

}

/* Switch from one thread to another. */

static void

switch_to_thread (pid)

     int pid;

{

  if (pid == inferior_pid)

    return;

  inferior_pid = pid;

  flush_cached_frames ();

  registers_changed ();

  stop_pc = read_pc ();

  select_frame (get_current_frame (), 0);

}

static void

restore_current_thread (pid)

     int pid;

{

  if (pid != inferior_pid)

    {

      switch_to_thread (pid);

      print_stack_frame (get_current_frame (), 0, -1);

    }

}

/* 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 (cmd, from_tty)

     char *cmd;

     int from_tty;

{

  struct thread_info *tp;

  struct cleanup *old_chain;

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

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

  old_chain = make_cleanup ((make_cleanup_func) restore_current_thread,

                            (void *) inferior_pid);

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

    if (thread_alive (tp))

      {

        switch_to_thread (tp->pid);

#ifdef HPUXHPPA

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

                         tp->num,

                         target_tid_to_str (inferior_pid));

#else

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

                         target_pid_to_str (inferior_pid));

#endif

        execute_command (cmd, from_tty);

      }

}

static void

thread_apply_command (tidlist, from_tty)

     char *tidlist;

     int from_tty;

{

  char *cmd;

  char *p;

  struct cleanup *old_chain;

  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");

  old_chain = make_cleanup ((make_cleanup_func) restore_current_thread,

                            (void *) inferior_pid);

  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->pid);

#ifdef HPUXHPPA

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

                               target_tid_to_str (inferior_pid));

#else

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

                               target_pid_to_str (inferior_pid));

#endif

              execute_command (cmd, from_tty);

            }

        }

    }

}

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

   if prefix of arg is `apply'.  */

static void

thread_command (tidstr, from_tty)

     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_pid),

#if defined(HPUXHPPA)

                         target_tid_to_str (inferior_pid)

#else

                         target_pid_to_str (inferior_pid)

#endif

          );

      else

        error ("No stack.");

      return;

    }

  gdb_thread_select (tidstr);

}

static int

do_captured_thread_select (void *tidstr)

{

  int num;

  struct thread_info *tp;

  num = atoi ((char *)tidstr);

  tp = find_thread_id (num);

#ifdef UI_OUT

  if (!tp)

    error ("Thread ID %d not known.", num);

#else

  if (!tp)

    error ("Thread ID %d not known.  Use the \"info threads\" command to\n\

see the IDs of currently known threads.", num);

#endif

  if (!thread_alive (tp))

    error ("Thread ID %d has terminated.\n", num);

  switch_to_thread (tp->pid);

#ifdef UI_OUT

  ui_out_text (uiout, "[Switching to thread ");

  ui_out_field_int (uiout, "new-thread-id", pid_to_thread_id (inferior_pid));

  ui_out_text (uiout, " (");

#if defined(HPUXHPPA)

  ui_out_text (uiout, target_tid_to_str (inferior_pid));

#else

  ui_out_text (uiout, target_pid_to_str (inferior_pid));

#endif

  ui_out_text (uiout, ")]");

#else /* UI_OUT */

  printf_filtered ("[Switching to thread %d (%s)]\n",

                   pid_to_thread_id (inferior_pid),

#if defined(HPUXHPPA)

                   target_tid_to_str (inferior_pid)

#else

                   target_pid_to_str (inferior_pid)

#endif

    );

#endif /* UI_OUT */