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/* Continuations for GDB, the GNU debugger.
Copyright (C) 1986-2018 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);
}
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