mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-09 04:21:49 +08:00
35f196d907
reinit_frame_cache. (flush_cached_frames): Rename to reinit_frame_cache and delete old implementation. * frame.h (flush_cached_frames): Delete prototype and update comment. * bsd-kvm.c (bsd_kvm_open, bsd_kvm_proc_cmd, bsd_kvm_pcb_cmd): Call reinit_frame_cache instead of flush_cached_frames. Do not call select_frame after reinit_frame_cache. * corelow.c (core_open): Likewise. * gdbarch.sh (deprecated_current_gdbarch_select_hack): Likewise. * infrun.c (prepare_to_proceed, context_switch) (handle_inferior_event): Likewise. * linux-fork.c (fork_load_infrun_state): Likewise. * ocd.c (ocd_start_remote): Likewise. * remote-e7000.c (e7000_start_remote): Likewise. * remote-mips.c (device): Likewise. * thread.c (switch_to_thread): Likewise. * tracepoint.c (finish_tfind_command): Likewise. * gdbarch.c: Regenerated.
740 lines
19 KiB
C
740 lines
19 KiB
C
/* Multi-process/thread control for GDB, the GNU debugger.
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Copyright (C) 1986, 1987, 1988, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
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2000, 2001, 2002, 2003, 2004, 2007 Free Software Foundation, Inc.
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Contributed by Lynx Real-Time Systems, Inc. Los Gatos, CA.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#include "defs.h"
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#include "symtab.h"
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#include "frame.h"
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#include "inferior.h"
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#include "environ.h"
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#include "value.h"
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#include "target.h"
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#include "gdbthread.h"
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#include "exceptions.h"
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#include "command.h"
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#include "gdbcmd.h"
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#include "regcache.h"
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#include "gdb.h"
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#include "gdb_string.h"
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#include <ctype.h>
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#include <sys/types.h>
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#include <signal.h>
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#include "ui-out.h"
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/*#include "lynxos-core.h" */
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/* Definition of struct thread_info exported to gdbthread.h */
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/* Prototypes for exported functions. */
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void _initialize_thread (void);
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/* Prototypes for local functions. */
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static struct thread_info *thread_list = NULL;
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static int highest_thread_num;
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static struct thread_info *find_thread_id (int num);
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static void thread_command (char *tidstr, int from_tty);
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static void thread_apply_all_command (char *, int);
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static int thread_alive (struct thread_info *);
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static void info_threads_command (char *, int);
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static void thread_apply_command (char *, int);
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static void restore_current_thread (ptid_t);
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static void switch_to_thread (ptid_t ptid);
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static void prune_threads (void);
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static struct cleanup *make_cleanup_restore_current_thread (ptid_t,
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struct frame_id);
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void
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delete_step_resume_breakpoint (void *arg)
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{
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struct breakpoint **breakpointp = (struct breakpoint **) arg;
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struct thread_info *tp;
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if (*breakpointp != NULL)
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{
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delete_breakpoint (*breakpointp);
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for (tp = thread_list; tp; tp = tp->next)
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if (tp->step_resume_breakpoint == *breakpointp)
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tp->step_resume_breakpoint = NULL;
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*breakpointp = NULL;
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}
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}
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static void
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free_thread (struct thread_info *tp)
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{
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/* NOTE: this will take care of any left-over step_resume breakpoints,
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but not any user-specified thread-specific breakpoints. */
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if (tp->step_resume_breakpoint)
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delete_breakpoint (tp->step_resume_breakpoint);
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/* FIXME: do I ever need to call the back-end to give it a
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chance at this private data before deleting the thread? */
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if (tp->private)
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xfree (tp->private);
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xfree (tp);
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}
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void
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init_thread_list (void)
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{
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struct thread_info *tp, *tpnext;
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highest_thread_num = 0;
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if (!thread_list)
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return;
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for (tp = thread_list; tp; tp = tpnext)
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{
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tpnext = tp->next;
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free_thread (tp);
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}
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thread_list = NULL;
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}
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/* add_thread now returns a pointer to the new thread_info,
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so that back_ends can initialize their private data. */
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struct thread_info *
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add_thread (ptid_t ptid)
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{
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struct thread_info *tp;
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tp = (struct thread_info *) xmalloc (sizeof (*tp));
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memset (tp, 0, sizeof (*tp));
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tp->ptid = ptid;
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tp->num = ++highest_thread_num;
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tp->next = thread_list;
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thread_list = tp;
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return tp;
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}
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void
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delete_thread (ptid_t ptid)
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{
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struct thread_info *tp, *tpprev;
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tpprev = NULL;
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for (tp = thread_list; tp; tpprev = tp, tp = tp->next)
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if (ptid_equal (tp->ptid, ptid))
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break;
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if (!tp)
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return;
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if (tpprev)
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tpprev->next = tp->next;
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else
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thread_list = tp->next;
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free_thread (tp);
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}
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static struct thread_info *
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find_thread_id (int num)
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{
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struct thread_info *tp;
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for (tp = thread_list; tp; tp = tp->next)
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if (tp->num == num)
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return tp;
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return NULL;
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}
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/* Find a thread_info by matching PTID. */
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struct thread_info *
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find_thread_pid (ptid_t ptid)
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{
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struct thread_info *tp;
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for (tp = thread_list; tp; tp = tp->next)
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if (ptid_equal (tp->ptid, ptid))
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return tp;
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return NULL;
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}
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/*
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* Thread iterator function.
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*
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* Calls a callback function once for each thread, so long as
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* the callback function returns false. If the callback function
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* returns true, the iteration will end and the current thread
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* will be returned. This can be useful for implementing a
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* search for a thread with arbitrary attributes, or for applying
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* some operation to every thread.
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*
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* FIXME: some of the existing functionality, such as
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* "Thread apply all", might be rewritten using this functionality.
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*/
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struct thread_info *
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iterate_over_threads (int (*callback) (struct thread_info *, void *),
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void *data)
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{
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struct thread_info *tp;
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for (tp = thread_list; tp; tp = tp->next)
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if ((*callback) (tp, data))
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return tp;
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return NULL;
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}
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int
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valid_thread_id (int num)
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{
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struct thread_info *tp;
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for (tp = thread_list; tp; tp = tp->next)
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if (tp->num == num)
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return 1;
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return 0;
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}
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int
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pid_to_thread_id (ptid_t ptid)
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{
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struct thread_info *tp;
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for (tp = thread_list; tp; tp = tp->next)
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if (ptid_equal (tp->ptid, ptid))
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return tp->num;
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return 0;
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}
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ptid_t
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thread_id_to_pid (int num)
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{
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struct thread_info *thread = find_thread_id (num);
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if (thread)
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return thread->ptid;
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else
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return pid_to_ptid (-1);
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}
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int
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in_thread_list (ptid_t ptid)
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{
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struct thread_info *tp;
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for (tp = thread_list; tp; tp = tp->next)
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if (ptid_equal (tp->ptid, ptid))
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return 1;
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return 0; /* Never heard of 'im */
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}
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/* Print a list of thread ids currently known, and the total number of
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threads. To be used from within catch_errors. */
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static int
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do_captured_list_thread_ids (struct ui_out *uiout, void *arg)
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{
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struct thread_info *tp;
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int num = 0;
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struct cleanup *cleanup_chain;
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prune_threads ();
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target_find_new_threads ();
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cleanup_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "thread-ids");
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for (tp = thread_list; tp; tp = tp->next)
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{
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num++;
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ui_out_field_int (uiout, "thread-id", tp->num);
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}
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do_cleanups (cleanup_chain);
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ui_out_field_int (uiout, "number-of-threads", num);
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return GDB_RC_OK;
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}
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/* Official gdblib interface function to get a list of thread ids and
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the total number. */
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enum gdb_rc
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gdb_list_thread_ids (struct ui_out *uiout, char **error_message)
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{
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return catch_exceptions_with_msg (uiout, do_captured_list_thread_ids, NULL,
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error_message, RETURN_MASK_ALL);
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}
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/* Load infrun state for the thread PID. */
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void
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load_infrun_state (ptid_t ptid,
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CORE_ADDR *prev_pc,
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int *trap_expected,
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struct breakpoint **step_resume_breakpoint,
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CORE_ADDR *step_range_start,
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CORE_ADDR *step_range_end,
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struct frame_id *step_frame_id,
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int *handling_longjmp,
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int *another_trap,
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int *stepping_through_solib_after_catch,
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bpstat *stepping_through_solib_catchpoints,
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int *current_line,
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struct symtab **current_symtab)
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{
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struct thread_info *tp;
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/* If we can't find the thread, then we're debugging a single threaded
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process. No need to do anything in that case. */
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tp = find_thread_id (pid_to_thread_id (ptid));
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if (tp == NULL)
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return;
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*prev_pc = tp->prev_pc;
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*trap_expected = tp->trap_expected;
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*step_resume_breakpoint = tp->step_resume_breakpoint;
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*step_range_start = tp->step_range_start;
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*step_range_end = tp->step_range_end;
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*step_frame_id = tp->step_frame_id;
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*handling_longjmp = tp->handling_longjmp;
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*another_trap = tp->another_trap;
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*stepping_through_solib_after_catch =
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tp->stepping_through_solib_after_catch;
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*stepping_through_solib_catchpoints =
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tp->stepping_through_solib_catchpoints;
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*current_line = tp->current_line;
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*current_symtab = tp->current_symtab;
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}
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/* Save infrun state for the thread PID. */
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void
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save_infrun_state (ptid_t ptid,
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CORE_ADDR prev_pc,
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int trap_expected,
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struct breakpoint *step_resume_breakpoint,
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CORE_ADDR step_range_start,
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CORE_ADDR step_range_end,
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const struct frame_id *step_frame_id,
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int handling_longjmp,
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int another_trap,
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int stepping_through_solib_after_catch,
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bpstat stepping_through_solib_catchpoints,
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int current_line,
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struct symtab *current_symtab)
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{
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struct thread_info *tp;
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/* If we can't find the thread, then we're debugging a single-threaded
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process. Nothing to do in that case. */
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tp = find_thread_id (pid_to_thread_id (ptid));
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if (tp == NULL)
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return;
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tp->prev_pc = prev_pc;
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tp->trap_expected = trap_expected;
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tp->step_resume_breakpoint = step_resume_breakpoint;
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tp->step_range_start = step_range_start;
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tp->step_range_end = step_range_end;
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tp->step_frame_id = (*step_frame_id);
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tp->handling_longjmp = handling_longjmp;
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tp->another_trap = another_trap;
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tp->stepping_through_solib_after_catch = stepping_through_solib_after_catch;
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tp->stepping_through_solib_catchpoints = stepping_through_solib_catchpoints;
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tp->current_line = current_line;
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tp->current_symtab = current_symtab;
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}
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/* Return true if TP is an active thread. */
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static int
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thread_alive (struct thread_info *tp)
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{
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if (PIDGET (tp->ptid) == -1)
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return 0;
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if (!target_thread_alive (tp->ptid))
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{
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tp->ptid = pid_to_ptid (-1); /* Mark it as dead */
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return 0;
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}
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return 1;
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}
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static void
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prune_threads (void)
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{
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struct thread_info *tp, *next;
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for (tp = thread_list; tp; tp = next)
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{
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next = tp->next;
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if (!thread_alive (tp))
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delete_thread (tp->ptid);
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}
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}
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/* Print information about currently known threads
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* Note: this has the drawback that it _really_ switches
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* threads, which frees the frame cache. A no-side
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* effects info-threads command would be nicer.
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*/
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static void
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info_threads_command (char *arg, int from_tty)
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{
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struct thread_info *tp;
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ptid_t current_ptid;
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struct frame_info *cur_frame;
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struct cleanup *old_chain;
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struct frame_id saved_frame_id;
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char *extra_info;
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/* Backup current thread and selected frame. */
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saved_frame_id = get_frame_id (get_selected_frame (NULL));
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old_chain = make_cleanup_restore_current_thread (inferior_ptid, saved_frame_id);
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prune_threads ();
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target_find_new_threads ();
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current_ptid = inferior_ptid;
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for (tp = thread_list; tp; tp = tp->next)
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{
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if (ptid_equal (tp->ptid, current_ptid))
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printf_filtered ("* ");
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else
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printf_filtered (" ");
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printf_filtered ("%d %s", tp->num, target_tid_to_str (tp->ptid));
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extra_info = target_extra_thread_info (tp);
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if (extra_info)
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printf_filtered (" (%s)", extra_info);
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puts_filtered (" ");
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/* That switch put us at the top of the stack (leaf frame). */
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switch_to_thread (tp->ptid);
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print_stack_frame (get_selected_frame (NULL), 0, LOCATION);
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}
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/* Restores the current thread and the frame selected before
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the "info threads" command. */
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do_cleanups (old_chain);
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/* If case we were not able to find the original frame, print the
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new selected frame. */
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if (frame_find_by_id (saved_frame_id) == NULL)
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{
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warning (_("Couldn't restore frame in current thread, at frame 0"));
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print_stack_frame (get_selected_frame (NULL), 0, LOCATION);
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}
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}
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/* Switch from one thread to another. */
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static void
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switch_to_thread (ptid_t ptid)
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{
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if (ptid_equal (ptid, inferior_ptid))
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return;
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inferior_ptid = ptid;
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reinit_frame_cache ();
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registers_changed ();
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stop_pc = read_pc ();
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}
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static void
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restore_current_thread (ptid_t ptid)
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{
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if (!ptid_equal (ptid, inferior_ptid))
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{
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switch_to_thread (ptid);
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}
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}
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static void
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restore_selected_frame (struct frame_id a_frame_id)
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{
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struct frame_info *selected_frame_info = NULL;
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if (frame_id_eq (a_frame_id, null_frame_id))
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return;
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if ((selected_frame_info = frame_find_by_id (a_frame_id)) != NULL)
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{
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select_frame (selected_frame_info);
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}
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}
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struct current_thread_cleanup
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{
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ptid_t inferior_ptid;
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struct frame_id selected_frame_id;
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};
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static void
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do_restore_current_thread_cleanup (void *arg)
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{
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struct current_thread_cleanup *old = arg;
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restore_current_thread (old->inferior_ptid);
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restore_selected_frame (old->selected_frame_id);
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xfree (old);
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}
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static struct cleanup *
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make_cleanup_restore_current_thread (ptid_t inferior_ptid,
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struct frame_id a_frame_id)
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{
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struct current_thread_cleanup *old
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= xmalloc (sizeof (struct current_thread_cleanup));
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old->inferior_ptid = inferior_ptid;
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old->selected_frame_id = a_frame_id;
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return make_cleanup (do_restore_current_thread_cleanup, old);
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}
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/* Apply a GDB command to a list of threads. List syntax is a whitespace
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seperated list of numbers, or ranges, or the keyword `all'. Ranges consist
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of two numbers seperated by a hyphen. Examples:
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thread apply 1 2 7 4 backtrace Apply backtrace cmd to threads 1,2,7,4
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thread apply 2-7 9 p foo(1) Apply p foo(1) cmd to threads 2->7 & 9
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thread apply all p x/i $pc Apply x/i $pc cmd to all threads
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*/
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static void
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thread_apply_all_command (char *cmd, int from_tty)
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{
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struct thread_info *tp;
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struct cleanup *old_chain;
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struct cleanup *saved_cmd_cleanup_chain;
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char *saved_cmd;
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struct frame_id saved_frame_id;
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ptid_t current_ptid;
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int thread_has_changed = 0;
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if (cmd == NULL || *cmd == '\000')
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error (_("Please specify a command following the thread ID list"));
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current_ptid = inferior_ptid;
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saved_frame_id = get_frame_id (get_selected_frame (NULL));
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old_chain = make_cleanup_restore_current_thread (inferior_ptid, saved_frame_id);
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/* It is safe to update the thread list now, before
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traversing it for "thread apply all". MVS */
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target_find_new_threads ();
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/* Save a copy of the command in case it is clobbered by
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execute_command */
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saved_cmd = xstrdup (cmd);
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saved_cmd_cleanup_chain = make_cleanup (xfree, (void *) saved_cmd);
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for (tp = thread_list; tp; tp = tp->next)
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if (thread_alive (tp))
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{
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switch_to_thread (tp->ptid);
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printf_filtered (_("\nThread %d (%s):\n"),
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tp->num, target_tid_to_str (inferior_ptid));
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execute_command (cmd, from_tty);
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strcpy (cmd, saved_cmd); /* Restore exact command used previously */
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}
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if (!ptid_equal (current_ptid, inferior_ptid))
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thread_has_changed = 1;
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do_cleanups (saved_cmd_cleanup_chain);
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do_cleanups (old_chain);
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/* Print stack frame only if we changed thread. */
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if (thread_has_changed)
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print_stack_frame (get_current_frame (), 1, SRC_LINE);
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}
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static void
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thread_apply_command (char *tidlist, int from_tty)
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{
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char *cmd;
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char *p;
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struct cleanup *old_chain;
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|
struct cleanup *saved_cmd_cleanup_chain;
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char *saved_cmd;
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struct frame_id saved_frame_id;
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ptid_t current_ptid;
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int thread_has_changed = 0;
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if (tidlist == NULL || *tidlist == '\000')
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error (_("Please specify a thread ID list"));
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for (cmd = tidlist; *cmd != '\000' && !isalpha (*cmd); cmd++);
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if (*cmd == '\000')
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error (_("Please specify a command following the thread ID list"));
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|
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current_ptid = inferior_ptid;
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saved_frame_id = get_frame_id (get_selected_frame (NULL));
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old_chain = make_cleanup_restore_current_thread (inferior_ptid, saved_frame_id);
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/* Save a copy of the command in case it is clobbered by
|
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execute_command */
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saved_cmd = xstrdup (cmd);
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saved_cmd_cleanup_chain = make_cleanup (xfree, (void *) saved_cmd);
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while (tidlist < cmd)
|
|
{
|
|
struct thread_info *tp;
|
|
int start, end;
|
|
|
|
start = strtol (tidlist, &p, 10);
|
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if (p == tidlist)
|
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error (_("Error parsing %s"), tidlist);
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tidlist = p;
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|
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while (*tidlist == ' ' || *tidlist == '\t')
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tidlist++;
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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);
|
|
}
|
|
|
|
static int
|
|
do_captured_thread_select (struct ui_out *uiout, void *tidstr)
|
|
{
|
|
int num;
|
|
struct thread_info *tp;
|
|
|
|
num = value_as_long (parse_and_eval (tidstr));
|
|
|
|
tp = find_thread_id (num);
|
|
|
|
if (!tp)
|
|
error (_("Thread ID %d not known."), num);
|
|
|
|
if (!thread_alive (tp))
|
|
error (_("Thread ID %d has terminated."), num);
|
|
|
|
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 (void)
|
|
{
|
|
static struct cmd_list_element *thread_apply_list = NULL;
|
|
|
|
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, "thread 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);
|
|
}
|