Initial revision

1 files changed, 721 insertions, 0 deletions

diff --git a/gdb/thread.c b/gdb/thread.c
new file mode 100644
index 00000000000..6a7ab092d7c
--- /dev/null
+++ b/gdb/thread.c
@@ -0,0 +1,721 @@
+/* Multi-process/thread control for GDB, the GNU debugger.
+   Copyright 1986, 1987, 1988, 1993, 1998
+
+   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>
+
+/*#include "lynxos-core.h"*/
+
+struct thread_info
+{
+  struct thread_info *next;
+  int pid;			/* Actual process id */
+  int num;			/* Convenient handle */
+  CORE_ADDR prev_pc;		/* State from wait_for_inferior */
+  CORE_ADDR prev_func_start;
+  char *prev_func_name;
+  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 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;
+
+  /* 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;
+
+  /* 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;
+
+};
+
+/* Prototypes for exported functions. */
+
+void _initialize_thread PARAMS ((void));
+
+/* Prototypes for local functions. */
+
+#if !defined(FIND_NEW_THREADS)
+#define FIND_NEW_THREADS target_find_new_threads
+#endif  
+			   
+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));
+
+/* If the host has threads, the host machine definition may set this
+   macro. But, for remote thread debugging, it gets more complex and
+   setting macros does not bind to the various target dependent
+   methods well. So, we use the vector target_thread_functions */
+
+static struct target_thread_vector *target_thread_functions;
+
+int
+target_find_new_threads ()
+{
+  int retval = 0;
+  if (target_thread_functions &&
+      target_thread_functions->find_new_threads)
+    retval = (*(target_thread_functions->find_new_threads)) ();
+  return retval;		/* no support */
+}
+
+
+int
+target_get_thread_info PARAMS ((gdb_threadref * ref,
+				int selection,		/* FIXME: Selection */
+				struct gdb_ext_thread_info * info));
+
+int
+target_get_thread_info (ref, selection, info)
+
+     gdb_threadref *ref;
+     int selection;
+    /* FIXME: Selection */
+     struct gdb_ext_thread_info *info;
+
+{
+  int retval = 0;
+  if (target_thread_functions
+      && target_thread_functions->get_thread_info)
+    retval = (*(target_thread_functions->get_thread_info)) (ref, selection, info);
+  return retval;
+}
+
+
+/* It is possible that these bind and unbinf functions implement a
+   stack the interface allows it, but its not implemented that way
+ */
+
+
+void
+bind_target_thread_vector (vec)
+     struct target_thread_vector *vec;
+{
+  target_thread_functions = vec;
+}
+
+struct target_thread_vector *
+unbind_target_thread_vector ()
+{
+  struct target_thread_vector *retval;
+  retval = target_thread_functions;
+  target_thread_functions = 0;
+  return retval;
+}				/* unbind_target_thread-vector */
+
+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;
+}
+
+void
+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;
+  thread_list = 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;
+
+  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;
+}
+
+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 */
+}
+
+/* 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, *tpprev, *next;
+
+  tpprev = 0;
+  for (tp = thread_list; tp; tp = next)
+    {
+      next = tp->next;
+      if (!thread_alive (tp))
+	{
+	  if (tpprev)
+	    tpprev->next = next;
+	  else
+	    thread_list  = next;
+	  free (tp);
+	}
+      else
+	tpprev = tp;
+    }
+}
+
+/* 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;
+
+  /* Avoid coredumps which would happen if we tried to access a NULL
+     selected_frame.  */
+  if (!target_has_stack) error ("No stack.");
+
+  prune_threads ();
+#if defined(FIND_NEW_THREADS)
+  FIND_NEW_THREADS ();
+#endif
+  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
+      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;
+{
+  int num;
+  struct thread_info *tp;
+
+  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;
+    }
+  num = atoi (tidstr);
+
+  tp = find_thread_id (num);
+
+  if (!tp)
+    error ("Thread ID %d not known.  Use the \"info threads\" command to\n\
+see the IDs of currently known threads.", num);
+
+  if (!thread_alive (tp))
+    error ("Thread ID %d has terminated.\n", num);
+
+  switch_to_thread (tp->pid);
+
+  if (context_hook)
+    context_hook (num);
+
+  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
+		   );
+  print_stack_frame (selected_frame, selected_frame_level, 1);
+}
+
+/* Commands with a prefix of `thread'.  */
+struct cmd_list_element *thread_cmd_list = NULL;
+
+void
+_initialize_thread ()
+{
+  static struct cmd_list_element *thread_apply_list = NULL;
+  extern struct cmd_list_element *cmdlist;
+
+  add_info ("threads", info_threads_command,
+	    "IDs of currently known threads.");
+
+  add_prefix_cmd ("thread", class_run, thread_command,
+		  "Use this command to switch between threads.\n\
+The new thread ID must be currently known.", &thread_cmd_list, "thread ", 1,
+		  &cmdlist);
+
+  add_prefix_cmd ("apply", class_run, thread_apply_command,
+		  "Apply a command to a list of threads.",
+		  &thread_apply_list, "apply ", 1, &thread_cmd_list);
+
+  add_cmd ("all", class_run, thread_apply_all_command,
+	   "Apply a command to all threads.",
+	   &thread_apply_list);
+
+  if (!xdb_commands)
+    add_com_alias ("t", "thread", class_run, 1);
+}