| 1 | /* Continuations for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright (C) 1986-2016 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "gdbthread.h" |
| 22 | #include "inferior.h" |
| 23 | #include "continuations.h" |
| 24 | |
| 25 | struct continuation |
| 26 | { |
| 27 | struct continuation *next; |
| 28 | continuation_ftype *function; |
| 29 | continuation_free_arg_ftype *free_arg; |
| 30 | void *arg; |
| 31 | }; |
| 32 | |
| 33 | /* Add a new continuation to the continuation chain. Args are |
| 34 | FUNCTION to run the continuation up with, and ARG to pass to |
| 35 | it. */ |
| 36 | |
| 37 | static void |
| 38 | make_continuation (struct continuation **pmy_chain, |
| 39 | continuation_ftype *function, |
| 40 | void *arg, void (*free_arg) (void *)) |
| 41 | { |
| 42 | struct continuation *newobj = XNEW (struct continuation); |
| 43 | |
| 44 | newobj->next = *pmy_chain; |
| 45 | newobj->function = function; |
| 46 | newobj->free_arg = free_arg; |
| 47 | newobj->arg = arg; |
| 48 | *pmy_chain = newobj; |
| 49 | } |
| 50 | |
| 51 | static void |
| 52 | do_my_continuations_1 (struct continuation **pmy_chain, int err) |
| 53 | { |
| 54 | struct continuation *ptr; |
| 55 | |
| 56 | while ((ptr = *pmy_chain) != NULL) |
| 57 | { |
| 58 | *pmy_chain = ptr->next; /* Do this first in case of recursion. */ |
| 59 | (*ptr->function) (ptr->arg, err); |
| 60 | if (ptr->free_arg) |
| 61 | (*ptr->free_arg) (ptr->arg); |
| 62 | xfree (ptr); |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | static void |
| 67 | do_my_continuations (struct continuation **list, int err) |
| 68 | { |
| 69 | struct continuation *continuations; |
| 70 | |
| 71 | if (*list == NULL) |
| 72 | return; |
| 73 | |
| 74 | /* Copy the list header into another pointer, and set the global |
| 75 | list header to null, so that the global list can change as a side |
| 76 | effect of invoking the continuations and the processing of the |
| 77 | preexisting continuations will not be affected. */ |
| 78 | |
| 79 | continuations = *list; |
| 80 | *list = NULL; |
| 81 | |
| 82 | /* Work now on the list we have set aside. */ |
| 83 | do_my_continuations_1 (&continuations, err); |
| 84 | } |
| 85 | |
| 86 | static void |
| 87 | discard_my_continuations_1 (struct continuation **pmy_chain) |
| 88 | { |
| 89 | struct continuation *ptr; |
| 90 | |
| 91 | while ((ptr = *pmy_chain) != NULL) |
| 92 | { |
| 93 | *pmy_chain = ptr->next; |
| 94 | if (ptr->free_arg) |
| 95 | (*ptr->free_arg) (ptr->arg); |
| 96 | xfree (ptr); |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | static void |
| 101 | discard_my_continuations (struct continuation **list) |
| 102 | { |
| 103 | discard_my_continuations_1 (list); |
| 104 | *list = NULL; |
| 105 | } |
| 106 | |
| 107 | /* Add a continuation to the continuation list of INFERIOR. The new |
| 108 | continuation will be added at the front. */ |
| 109 | |
| 110 | void |
| 111 | add_inferior_continuation (continuation_ftype *hook, void *args, |
| 112 | continuation_free_arg_ftype *free_arg) |
| 113 | { |
| 114 | struct inferior *inf = current_inferior (); |
| 115 | |
| 116 | make_continuation (&inf->continuations, hook, args, free_arg); |
| 117 | } |
| 118 | |
| 119 | /* Do all continuations of the current inferior. */ |
| 120 | |
| 121 | void |
| 122 | do_all_inferior_continuations (int err) |
| 123 | { |
| 124 | struct inferior *inf = current_inferior (); |
| 125 | do_my_continuations (&inf->continuations, err); |
| 126 | } |
| 127 | |
| 128 | /* Get rid of all the inferior-wide continuations of INF. */ |
| 129 | |
| 130 | void |
| 131 | discard_all_inferior_continuations (struct inferior *inf) |
| 132 | { |
| 133 | discard_my_continuations (&inf->continuations); |
| 134 | } |