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Make "checkpoint" not rely on inferior_ptid 

Don't rely on "inferior_ptid" deep within add_fork.  In the
multi-target branch, I'm forcing inferior_ptid to null_ptid early in
infrun event handling to make sure we don't inadvertently rely on the
current thread/target when we shouldn't, and that caught some bad or
unnecessary assumptions throughout.

gdb/ChangeLog:
2019-03-06  Pedro Alves  <palves@redhat.com>

	* linux-fork.c (new_fork): New, split out of ...
	(add_fork): ... this.  Return void.  Move "first fork" special
	case from here, to ...
	(checkpoint_command): ... here.
	* linux-linux.h (add_fork): Return void.
This commit is contained in:
Pedro Alves 2019-03-06 18:29:17 +00:00
parent efbecbc143
commit 72f31aea9e
3 changed files with 37 additions and 17 deletions
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8
gdb/ChangeLog
View File

@ -1,3 +1,11 @@
2019-03-06 Pedro Alves <palves@redhat.com>
* linux-fork.c (new_fork): New, split out of ...
(add_fork): ... this. Return void. Move "first fork" special
case from here, to ...
(checkpoint_command): ... here.
* linux-linux.h (add_fork): Return void.
2019-03-06 Andrew Burgess <andrew.burgess@embecosm.com>
* f-exp.y (direct_abs_decl): Handle TYPE*SIZE type names.

44
gdb/linux-fork.c
View File

@ -76,29 +76,30 @@ find_last_fork (void)
return last;
}
/* Add a fork to the internal fork list. */
/* Allocate a new fork. */
struct fork_info *
add_fork (pid_t pid)
static struct fork_info *
new_fork (pid_t pid)
{
struct fork_info *fp;
if (fork_list == NULL && pid != inferior_ptid.pid ())
{
/* Special case -- if this is the first fork in the list
(the list is hitherto empty), and if this new fork is
NOT the current inferior_ptid, then add inferior_ptid
first, as a special zeroeth fork id. */
highest_fork_num = -1;
add_fork (inferior_ptid.pid ()); /* safe recursion */
}
fp = XCNEW (struct fork_info);
fp->ptid = ptid_t (pid, pid, 0);
fp->num = ++highest_fork_num;
return fp;
}
/* Add a new fork to the internal fork list. */
void
add_fork (pid_t pid)
{
struct fork_info *fp = new_fork (pid);
if (fork_list == NULL)
fork_list = fp;
{
fork_list = fp;
highest_fork_num = 0;
}
else
{
struct fork_info *last = find_last_fork ();
@ -106,7 +107,7 @@ add_fork (pid_t pid)
last->next = fp;
}
return fp;
fp->num = ++highest_fork_num;
}
static void
@ -760,6 +761,17 @@ checkpoint_command (const char *args, int from_tty)
if (!fp)
error (_("Failed to find new fork"));
if (fork_list->next == NULL)
{
/* Special case -- if this is the first fork in the list (the
list was hitherto empty), then add inferior_ptid first, as a
special zeroeth fork id. */
fork_info *first = new_fork (inferior_ptid.pid ());
first->next = fork_list;
fork_list = first;
}
fork_save_infrun_state (fp, 1);
fp->parent_ptid = last_target_ptid;
}

2
gdb/linux-fork.h
View File

@ -21,7 +21,7 @@
#define LINUX_FORK_H
struct fork_info;
extern struct fork_info *add_fork (pid_t);
extern void add_fork (pid_t);
extern struct fork_info *find_fork_pid (pid_t);
extern void linux_fork_killall (void);
extern void linux_fork_mourn_inferior (void);