/* Multi-process/thread control for GDB, the GNU debugger.
- Copyright 1986, 1987, 1988, 1993
+
+ Copyright 1986, 1987, 1988, 1993, 1994, 1995, 1996, 1997, 1998,
+ 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
Contributed by Lynx Real-Time Systems, Inc. Los Gatos, CA.
- Free Software Foundation, Inc.
-This file is part of GDB.
+ 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 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.
+ 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+ 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 "environ.h"
#include "value.h"
#include "target.h"
-#include "thread.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"
-/*#include "lynxos-core.h"*/
+/*#include "lynxos-core.h" */
-struct thread_info
-{
- struct thread_info *next;
- int pid; /* Actual process id */
- int num; /* Convenient handle */
-};
+/* 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 void thread_info PARAMS ((void));
+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 switch_to_thread (ptid_t ptid);
+static void prune_threads (void);
+
+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 thread_command PARAMS ((char * tidstr, int from_tty));
+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. */
+ if (tp->step_resume_breakpoint)
+ delete_breakpoint (tp->step_resume_breakpoint);
-static void prune_threads PARAMS ((void));
+ /* 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);
-static void thread_switch PARAMS ((int pid));
+ xfree (tp);
+}
void
-init_thread_list ()
+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 (tp);
+ free_thread (tp);
}
thread_list = NULL;
- highest_thread_num = 0;
}
-void
-add_thread (pid)
- int pid;
+/* 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 (ptid_t ptid)
{
struct thread_info *tp;
- tp = (struct thread_info *) xmalloc (sizeof (struct thread_info));
-
- tp->pid = pid;
+ 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;
+}
+
+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 (num)
- int num;
+find_thread_id (int num)
{
struct thread_info *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
-in_thread_list (pid)
- int pid;
+valid_thread_id (int num)
{
struct thread_info *tp;
for (tp = thread_list; tp; tp = tp->next)
- if (tp->pid == pid)
+ 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 */
}
-#if 0
+/* 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)
+{
+ return catch_exceptions_with_msg (uiout, do_captured_list_thread_ids, NULL,
+ error_message, RETURN_MASK_ALL);
+}
+
+/* Load infrun state for the thread PID. */
+
void
-bfd_get_core_threads (abfd)
- bfd *abfd;
+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_after_catch,
+ bpstat *stepping_through_solib_catchpoints,
+ int *current_line,
+ struct symtab **current_symtab)
{
- int i;
+ struct thread_info *tp;
- inferior_pid = BUILDPID (inferior_pid, core_thread (abfd)->pid);
- for (i = 0; i < core_pss (abfd).threadcnt; i++)
- add_thread (core_thread (abfd)[i].pid);
+ /* 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;
+ *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;
+ *current_line = tp->current_line;
+ *current_symtab = tp->current_symtab;
}
-#endif
-static void
-prune_threads ()
+/* 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 another_trap,
+ int stepping_through_solib_after_catch,
+ bpstat stepping_through_solib_catchpoints,
+ int current_line,
+ struct symtab *current_symtab)
{
- struct thread_info *tp, *tpprev;
+ struct thread_info *tp;
- tpprev = 0;
+ /* 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;
- for (tp = thread_list; tp; tp = tp->next)
- if (tp->pid == -1)
- {
- if (tpprev)
- tpprev->next = tp->next;
- else
- thread_list = NULL;
+ 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->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->current_line = current_line;
+ tp->current_symtab = current_symtab;
+}
- free (tp);
- }
- else
- tpprev = tp;
+/* 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 */
+/* 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;
+info_threads_command (char *arg, int from_tty)
{
struct thread_info *tp;
- int current_pid = inferior_pid;
+ ptid_t current_ptid;
+ struct frame_info *cur_frame;
+ struct frame_id saved_frame_id = get_frame_id (get_selected_frame (NULL));
+ char *extra_info;
+ prune_threads ();
+ target_find_new_threads ();
+ current_ptid = inferior_ptid;
for (tp = thread_list; tp; tp = tp->next)
{
- if (target_has_execution
- && kill (tp->pid, 0) == -1)
- {
- tp->pid == -1; /* Mark it as dead */
- continue;
- }
-
- if (tp->pid == current_pid)
+ if (ptid_equal (tp->ptid, current_ptid))
printf_filtered ("* ");
else
printf_filtered (" ");
- printf_filtered ("%d %s ", tp->num, target_pid_to_str (tp->pid));
+ 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 (" ");
- thread_switch (tp->pid);
- print_stack_frame (selected_frame, -1, 0);
+ switch_to_thread (tp->ptid);
+ print_stack_frame (get_selected_frame (NULL), 0, LOCATION);
}
- thread_switch (current_pid);
- prune_threads ();
+ switch_to_thread (current_ptid);
+
+ /* 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). */
+ cur_frame = frame_find_by_id (saved_frame_id);
+ if (cur_frame == NULL)
+ {
+ /* Ooops, can't restore, tell user where we are. */
+ warning (_("Couldn't restore frame in current thread, at frame 0"));
+ print_stack_frame (get_selected_frame (NULL), 0, LOCATION);
+ }
+ else
+ {
+ select_frame (cur_frame);
+ /* re-show current frame. */
+ show_stack_frame (cur_frame);
+ }
}
/* Switch from one thread to another. */
static void
-thread_switch (pid)
- int pid;
+switch_to_thread (ptid_t ptid)
{
- if (pid == inferior_pid)
+ if (ptid_equal (ptid, inferior_ptid))
return;
- inferior_pid = pid;
- pc_changed = 0;
+ inferior_ptid = ptid;
flush_cached_frames ();
registers_changed ();
- stop_pc = read_pc();
- set_current_frame (create_new_frame (read_fp (), stop_pc));
- stop_frame_address = FRAME_FP (get_current_frame ());
- select_frame (get_current_frame (), 0);
+ stop_pc = read_pc ();
+ select_frame (get_current_frame ());
}
static void
-thread_command (tidstr, from_tty)
- char *tidstr;
- int from_tty;
+restore_current_thread (ptid_t ptid)
+{
+ if (!ptid_equal (ptid, inferior_ptid))
+ {
+ switch_to_thread (ptid);
+ print_stack_frame (get_current_frame (), 1, SRC_LINE);
+ }
+}
+
+struct current_thread_cleanup
+{
+ ptid_t inferior_ptid;
+};
+
+static void
+do_restore_current_thread_cleanup (void *arg)
+{
+ struct current_thread_cleanup *old = arg;
+ restore_current_thread (old->inferior_ptid);
+ xfree (old);
+}
+
+static struct cleanup *
+make_cleanup_restore_current_thread (ptid_t inferior_ptid)
+{
+ struct current_thread_cleanup *old
+ = xmalloc (sizeof (struct current_thread_cleanup));
+ old->inferior_ptid = inferior_ptid;
+ 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)
{
- int num;
struct thread_info *tp;
+ struct cleanup *old_chain;
+ struct cleanup *saved_cmd_cleanup_chain;
+ char *saved_cmd;
+
+ if (cmd == NULL || *cmd == '\000')
+ error (_("Please specify a command following the thread ID list"));
+
+ old_chain = make_cleanup_restore_current_thread (inferior_ptid);
+
+ /* 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 */
+ }
+
+ do_cleanups (saved_cmd_cleanup_chain);
+ do_cleanups (old_chain);
+}
+
+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;
+
+ 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_restore_current_thread (inferior_ptid);
+
+ /* 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 */
+ }
+ }
+ }
+
+ do_cleanups (saved_cmd_cleanup_chain);
+ do_cleanups (old_chain);
+}
+
+/* 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)
- error ("Please specify a thread ID. Use the \"info threads\" command to\n\
-see the IDs of currently known threads.");
+ {
+ /* 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);
+}
+static int
+do_captured_thread_select (struct ui_out *uiout, void *tidstr)
+{
+ int num;
+ struct thread_info *tp;
- num = atoi (tidstr);
+ num = value_as_long (parse_and_eval (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);
+ error (_("Thread ID %d not known."), num);
- thread_switch (tp->pid);
+ if (!thread_alive (tp))
+ error (_("Thread ID %d has terminated."), num);
- printf_filtered ("[Switching to %s]\n", target_pid_to_str (inferior_pid));
- print_stack_frame (selected_frame, selected_frame_level, 1);
+ switch_to_thread (tp->ptid);
+
+ ui_out_text (uiout, "[Switching to thread ");
+ ui_out_field_int (uiout, "new-thread-id", pid_to_thread_id (inferior_ptid));
+ ui_out_text (uiout, " (");
+ ui_out_text (uiout, target_tid_to_str (inferior_ptid));
+ ui_out_text (uiout, ")]");
+
+ print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
+ return GDB_RC_OK;
+}
+
+enum gdb_rc
+gdb_thread_select (struct ui_out *uiout, char *tidstr, char **error_message)
+{
+ return catch_exceptions_with_msg (uiout, do_captured_thread_select, tidstr,
+ error_message, RETURN_MASK_ALL);
}
+/* Commands with a prefix of `thread'. */
+struct cmd_list_element *thread_cmd_list = NULL;
+
void
-_initialize_thread ()
+_initialize_thread (void)
{
+ static struct cmd_list_element *thread_apply_list = NULL;
+
add_info ("threads", info_threads_command,
- "IDs of currently known threads.");
- add_com ("thread", class_info, thread_command,
- "Use this command to switch between threads.\n\
-The new thread ID must be currently known.");
+ _("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);
}
projects / deliverable / binutils-gdb.git / blobdiff