324 lines
8.5 KiB
C
324 lines
8.5 KiB
C
/* Continuations for GDB, the GNU debugger.
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Copyright (C) 1986-2015 Free Software Foundation, Inc.
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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 3 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, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "gdbthread.h"
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#include "inferior.h"
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#include "continuations.h"
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struct continuation
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{
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struct continuation *next;
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continuation_ftype *function;
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continuation_free_arg_ftype *free_arg;
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void *arg;
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};
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/* Add a new continuation to the continuation chain. Args are
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FUNCTION to run the continuation up with, and ARG to pass to
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it. */
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static void
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make_continuation (struct continuation **pmy_chain,
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continuation_ftype *function,
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void *arg, void (*free_arg) (void *))
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{
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struct continuation *new = XNEW (struct continuation);
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new->next = *pmy_chain;
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new->function = function;
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new->free_arg = free_arg;
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new->arg = arg;
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*pmy_chain = new;
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}
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static void
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do_my_continuations_1 (struct continuation **pmy_chain, int err)
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{
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struct continuation *ptr;
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while ((ptr = *pmy_chain) != NULL)
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{
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*pmy_chain = ptr->next; /* Do this first in case of recursion. */
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(*ptr->function) (ptr->arg, err);
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if (ptr->free_arg)
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(*ptr->free_arg) (ptr->arg);
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xfree (ptr);
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}
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}
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static void
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do_my_continuations (struct continuation **list, int err)
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{
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struct continuation *continuations;
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if (*list == NULL)
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return;
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/* Copy the list header into another pointer, and set the global
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list header to null, so that the global list can change as a side
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effect of invoking the continuations and the processing of the
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preexisting continuations will not be affected. */
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continuations = *list;
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*list = NULL;
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/* Work now on the list we have set aside. */
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do_my_continuations_1 (&continuations, err);
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}
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static void
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discard_my_continuations_1 (struct continuation **pmy_chain)
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{
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struct continuation *ptr;
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while ((ptr = *pmy_chain) != NULL)
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{
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*pmy_chain = ptr->next;
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if (ptr->free_arg)
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(*ptr->free_arg) (ptr->arg);
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xfree (ptr);
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}
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}
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static void
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discard_my_continuations (struct continuation **list)
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{
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discard_my_continuations_1 (list);
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*list = NULL;
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}
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/* Add a continuation to the continuation list of INFERIOR. The new
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continuation will be added at the front. */
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void
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add_inferior_continuation (continuation_ftype *hook, void *args,
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continuation_free_arg_ftype *free_arg)
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{
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struct inferior *inf = current_inferior ();
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make_continuation (&inf->continuations, hook, args, free_arg);
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}
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/* Do all continuations of the current inferior. */
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void
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do_all_inferior_continuations (int err)
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{
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struct inferior *inf = current_inferior ();
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do_my_continuations (&inf->continuations, err);
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}
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/* Get rid of all the inferior-wide continuations of INF. */
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void
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discard_all_inferior_continuations (struct inferior *inf)
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{
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discard_my_continuations (&inf->continuations);
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}
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/* Add a continuation to the continuation list of THREAD. The new
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continuation will be added at the front. */
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void
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add_continuation (struct thread_info *thread,
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continuation_ftype *hook, void *args,
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continuation_free_arg_ftype *free_arg)
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{
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make_continuation (&thread->continuations, hook, args, free_arg);
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}
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static void
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restore_thread_cleanup (void *arg)
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{
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ptid_t *ptid_p = arg;
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switch_to_thread (*ptid_p);
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}
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/* Walk down the continuation list of PTID, and execute all the
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continuations. There is a problem though. In some cases new
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continuations may be added while we are in the middle of this loop.
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If this happens they will be added in the front, and done before we
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have a chance of exhausting those that were already there. We need
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to then save the beginning of the list in a pointer and do the
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continuations from there on, instead of using the global beginning
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of list as our iteration pointer. */
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static void
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do_all_continuations_ptid (ptid_t ptid,
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struct continuation **continuations_p,
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int err)
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{
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struct cleanup *old_chain;
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ptid_t current_thread;
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if (*continuations_p == NULL)
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return;
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current_thread = inferior_ptid;
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/* Restore selected thread on exit. Don't try to restore the frame
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as well, because:
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- When running continuations, the selected frame is always #0.
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- The continuations may trigger symbol file loads, which may
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change the frame layout (frame ids change), which would trigger
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a warning if we used make_cleanup_restore_current_thread. */
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old_chain = make_cleanup (restore_thread_cleanup, ¤t_thread);
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/* Let the continuation see this thread as selected. */
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switch_to_thread (ptid);
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do_my_continuations (continuations_p, err);
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do_cleanups (old_chain);
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}
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/* Callback for iterate over threads. */
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static int
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do_all_continuations_thread_callback (struct thread_info *thread, void *data)
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{
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int err = * (int *) data;
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do_all_continuations_ptid (thread->ptid, &thread->continuations, err);
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return 0;
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}
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/* Do all continuations of thread THREAD. */
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void
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do_all_continuations_thread (struct thread_info *thread, int err)
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{
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do_all_continuations_thread_callback (thread, &err);
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}
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/* Do all continuations of all threads. */
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void
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do_all_continuations (int err)
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{
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iterate_over_threads (do_all_continuations_thread_callback, &err);
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}
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/* Callback for iterate over threads. */
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static int
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discard_all_continuations_thread_callback (struct thread_info *thread,
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void *data)
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{
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discard_my_continuations (&thread->continuations);
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return 0;
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}
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/* Get rid of all the continuations of THREAD. */
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void
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discard_all_continuations_thread (struct thread_info *thread)
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{
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discard_all_continuations_thread_callback (thread, NULL);
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}
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/* Get rid of all the continuations of all threads. */
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void
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discard_all_continuations (void)
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{
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iterate_over_threads (discard_all_continuations_thread_callback, NULL);
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}
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/* Add a continuation to the intermediate continuation list of THREAD.
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The new continuation will be added at the front. */
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void
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add_intermediate_continuation (struct thread_info *thread,
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continuation_ftype *hook,
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void *args,
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continuation_free_arg_ftype *free_arg)
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{
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make_continuation (&thread->intermediate_continuations, hook,
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args, free_arg);
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}
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/* Walk down the cmd_continuation list, and execute all the
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continuations. There is a problem though. In some cases new
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continuations may be added while we are in the middle of this
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loop. If this happens they will be added in the front, and done
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before we have a chance of exhausting those that were already
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there. We need to then save the beginning of the list in a pointer
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and do the continuations from there on, instead of using the
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global beginning of list as our iteration pointer. */
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static int
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do_all_intermediate_continuations_thread_callback (struct thread_info *thread,
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void *data)
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{
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int err = * (int *) data;
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do_all_continuations_ptid (thread->ptid,
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&thread->intermediate_continuations, err);
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return 0;
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}
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/* Do all intermediate continuations of thread THREAD. */
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void
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do_all_intermediate_continuations_thread (struct thread_info *thread, int err)
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{
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do_all_intermediate_continuations_thread_callback (thread, &err);
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}
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/* Do all intermediate continuations of all threads. */
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void
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do_all_intermediate_continuations (int err)
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{
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iterate_over_threads (do_all_intermediate_continuations_thread_callback,
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&err);
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}
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/* Callback for iterate over threads. */
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static int
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discard_all_intermediate_continuations_thread_callback (struct thread_info *thread,
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void *data)
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{
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discard_my_continuations (&thread->intermediate_continuations);
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return 0;
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}
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/* Get rid of all the intermediate continuations of THREAD. */
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void
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discard_all_intermediate_continuations_thread (struct thread_info *thread)
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{
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discard_all_intermediate_continuations_thread_callback (thread, NULL);
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}
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/* Get rid of all the intermediate continuations of all threads. */
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void
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discard_all_intermediate_continuations (void)
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{
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iterate_over_threads (discard_all_intermediate_continuations_thread_callback,
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NULL);
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}
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