| /* Continuations for GDB, the GNU debugger. |
| |
| Copyright (C) 1986-2019 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 3 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, see <http://www.gnu.org/licenses/>. */ |
| |
| #include "defs.h" |
| #include "gdbthread.h" |
| #include "inferior.h" |
| #include "continuations.h" |
| |
| struct continuation |
| { |
| struct continuation *next; |
| continuation_ftype *function; |
| continuation_free_arg_ftype *free_arg; |
| void *arg; |
| }; |
| |
| /* Add a new continuation to the continuation chain. Args are |
| FUNCTION to run the continuation up with, and ARG to pass to |
| it. */ |
| |
| static void |
| make_continuation (struct continuation **pmy_chain, |
| continuation_ftype *function, |
| void *arg, void (*free_arg) (void *)) |
| { |
| struct continuation *newobj = XNEW (struct continuation); |
| |
| newobj->next = *pmy_chain; |
| newobj->function = function; |
| newobj->free_arg = free_arg; |
| newobj->arg = arg; |
| *pmy_chain = newobj; |
| } |
| |
| static void |
| do_my_continuations_1 (struct continuation **pmy_chain, int err) |
| { |
| struct continuation *ptr; |
| |
| while ((ptr = *pmy_chain) != NULL) |
| { |
| *pmy_chain = ptr->next; /* Do this first in case of recursion. */ |
| (*ptr->function) (ptr->arg, err); |
| if (ptr->free_arg) |
| (*ptr->free_arg) (ptr->arg); |
| xfree (ptr); |
| } |
| } |
| |
| static void |
| do_my_continuations (struct continuation **list, int err) |
| { |
| struct continuation *continuations; |
| |
| if (*list == NULL) |
| return; |
| |
| /* Copy the list header into another pointer, and set the global |
| list header to null, so that the global list can change as a side |
| effect of invoking the continuations and the processing of the |
| preexisting continuations will not be affected. */ |
| |
| continuations = *list; |
| *list = NULL; |
| |
| /* Work now on the list we have set aside. */ |
| do_my_continuations_1 (&continuations, err); |
| } |
| |
| static void |
| discard_my_continuations_1 (struct continuation **pmy_chain) |
| { |
| struct continuation *ptr; |
| |
| while ((ptr = *pmy_chain) != NULL) |
| { |
| *pmy_chain = ptr->next; |
| if (ptr->free_arg) |
| (*ptr->free_arg) (ptr->arg); |
| xfree (ptr); |
| } |
| } |
| |
| static void |
| discard_my_continuations (struct continuation **list) |
| { |
| discard_my_continuations_1 (list); |
| *list = NULL; |
| } |
| |
| /* Add a continuation to the continuation list of INFERIOR. The new |
| continuation will be added at the front. */ |
| |
| void |
| add_inferior_continuation (continuation_ftype *hook, void *args, |
| continuation_free_arg_ftype *free_arg) |
| { |
| struct inferior *inf = current_inferior (); |
| |
| make_continuation (&inf->continuations, hook, args, free_arg); |
| } |
| |
| /* Do all continuations of the current inferior. */ |
| |
| void |
| do_all_inferior_continuations (int err) |
| { |
| struct inferior *inf = current_inferior (); |
| do_my_continuations (&inf->continuations, err); |
| } |
| |
| /* Get rid of all the inferior-wide continuations of INF. */ |
| |
| void |
| discard_all_inferior_continuations (struct inferior *inf) |
| { |
| discard_my_continuations (&inf->continuations); |
| } |