The current linux checkpoint code, most of which may be found in
linux-fork.c, is quite broken when attempting to use more than
one inferior. Running GDB will show internal errors when starting
two inferiors, placing a checkpoint in one, then switching to
the other and doing one of the following commands, "restart",
"detach", "kill", or continue (to program exit). Test cases
for two of those scenarios may be found in this bug:
https://sourceware.org/bugzilla/show_bug.cgi?id=31065
I've tested for each of the scenarios and many more in the new
test case, gdb.multi/checkpoint-multi.exp.
I started off with the goal of fixing just those problems, and was
mostly successful with a much smaller patch, but doing "info
checkpoints" with more than one inferior didn't work correctly due to
some of the inferiors being in the wrong program space. That led me
to making the linux-fork code fully inferior-aware.
Prior to this commit, the list of forks was being maintained in a
global named named 'fork_list'. I turned this into a per-inferior
data structure. There was also global named 'highest_fork_num' which
is also now part of the per-inferior struct. A registry key named
'checkpoint_inferior_data_key' along with function
'get_checkpoint_inferior_data' is used to access the per-inferior
data. This new function, get_checkpoint_inferior_data, is only
called by the new functions 'fork_list' and 'highest_fork_num', each
of which is passed a pointer to the inferior. Most occurrences
referring to the (previously) global 'fork_list' have been replaced
by 'fork_list (inf)'. In some functions, where the 'fork_list' is
referenced multiple times, a local named 'fork_list' is declared and
initialized instead, like this:
auto &fork_list = ::fork_list (inf);
The constructor for 'struct fork_info' has gained an additional
parameter. In addition to passing the pid of the new fork, we now
also pass the fork identifier, fork_num, to the constructor. This
integer is shown to the user in the "info checkpoints" command and
is provided by the user, perhaps in conjunction with the inferior
number, in commands which manipulate checkpoints, e.g. 'restart' and
'delete checkpoint'.
When checkpoints are used in only one inferior, this commit will
present information to the user and will accept checkpoint identifiers
to commands in much the same way as the code did before this commit.
Per Pedro Alves's recommendations, the "info checkpoints" command
has been changed somewhat. "info checkpoints" used to display
"(main process)" for the first process in the checkpoint list.
This is no longer done because it does not provide useful information.
It also used to display "<running>", presumably when in non-stop
mode. I've changed this to print a state flag 'R'. Additionally,
a state flag 'A' is used to indicate the active checkpoint for
each inferior. For the active inferior a '*' is also printed
preceding the checkpoint identifier. Here's what things look(ed)
like before and after for just one inferior:
Before:
(gdb) info checkpoints
* 0 Thread 0x7ffff7cd3740 (LWP 84201) (main process) at 0x40114a, file hello.c, line 28
1 process 84205 at 0x401199, file hello.c, line 51
2 process 84206 at 0x4011a3, file hello.c, line 53
After:
(gdb) info checkpoints
* 0 A process 84159 at 0x40114a, file hello.c, line 28
1 process 84162 at 0x401199, file hello.c, line 51
2 process 84163 at 0x4011a3, file hello.c, line 53
(The Thread versus process distinction is handled by another
patch - the "After" example assumes that patch is applied too.)
When there are multiple inferiors, the "info checkpoints" output looks
like this:
(gdb) info checkpoints
1.0 process 84159 at 0x40114a, file hello.c, line 28
* 1.1 A process 84162 at 0x401199, file hello.c, line 51
1.2 process 84163 at 0x4011a3, file hello.c, line 53
2.0 A process 84223 at 0x40116f, file hangout.c, line 35
2.1 process 84224 at 0x40115c, file hangout.c, line 31
2.2 process 84225 at 0x401166, file hangout.c, line 33
3.0 A process 84226 at 0x401218, file goodbye.c, line 46
3.1 process 84229 at 0x40124e, file goodbye.c, line 61
A new function named 'parse_checkpoint_id' has been added. As its
name suggests, it's responsible for parsing a string representing a
checkpoint identifier. These identifiers may be either a decimal
number representing the checkpoint number in the current inferior or
two decimal numbers separated by '.', in which case the first is the
inferior number and the second is the checkpoint number in that
inferior. It is called by delete_checkpoint_command,
detach_checkpoint_command, info_checkpoints_command, and
restart_command. Calls to 'parse_checkpoint_id' replace calls to
'parse_and_eval_long', plus error checking and error reporting code
near the calls to 'parse_and_eval_long'. As such, error checking and
reporting has been consolidated into a single function and the
messages output are more uniform, though this has necessitated changes
to the existing test case gdb.base/checkpoint.exp.
The functions 'find_fork_ptid' and 'find_fork_pid' used to return a
pointer to a fork_info struct. They now return a pair consisting of
the pointer to a fork_info struct in addition to a pointer to the
inferior containing that checkpoint.
'find_fork_id' returns a a pointer to a fork_info struct just as
it did before, but it's now gained a new parameter, 'inf', which
is the inferior in which to look.
info_checkpoints_command used to simply iterate over the list of
forks (checkpoints), printing each one out. It now needs to iterate
over all inferiors and, for those which have checkpoints, it needs
to iterate over the list of checkpoints in that inferior. As noted
earlier, the format of the output has been changed so that checkpoint
identifers incorporating an inferior number may be printed.
linux_fork_context, called by restart_command, now contains code to
switch inferiors when the fork being restarted is in a different
inferior from the current one. The scoped_switch_fork_info class now
also contains code for switching inferiors in both the constructor and
destructor.
gdb/linux-nat.c has a few changes. All but one of them are related
to passing the inferior to one of the linux-fork functions. But
one of the tests in linux_nat_target::detach has also changed in
a non-obvious way. In attempting to determine whether to call
linux_fork_detach(), that code used to do:
if (pid == inferior_ptid.pid () && forks_exist_p ())
It's been simplified to:
if (forks_exist_p (inf))
I had added the 'pid == inferior_ptid.pid ()' condition in late 2023
while working on a detach bug. It was kind of a hack to prevent
calling linux_fork_detach() when in a different inferior. That's no
longer needed since the call to forks_exist_p does this directly -
i.e. it is now inferior-aware.
Finally, the header file 'linux-fork.h' has been updated to reflect
the fact that add_fork, linux_fork_killall, linux_fork_mourn_inferior,
linux_fork_detach, and forks_exist_p all now require that a pointer to
an inferior be passed to these functions. Additionally (as mentioned
earlier), find_fork_pid now returns std::pair<fork_info *, inferior *>
instead 'of fork_info *'.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=31065
---
gdb/linux-fork.c | 519 +++++++++-----
gdb/linux-fork.h | 15 +-
gdb/linux-nat.c | 20 +-
gdb/testsuite/gdb.base/checkpoint.exp | 24 +-
gdb/testsuite/gdb.multi/checkpoint-multi.exp | 687 +++++++++++++++++++
5 files changed, 1079 insertions(+), 186 deletions(-)
create mode 100644 gdb/testsuite/gdb.multi/checkpoint-multi.exp
@@ -28,6 +28,7 @@
#include "linux-nat.h"
#include "gdbthread.h"
#include "source.h"
+#include "progspace-and-thread.h"
#include "nat/gdb_ptrace.h"
#include "gdbsupport/gdb_wait.h"
@@ -38,10 +39,11 @@
#include <list>
/* Fork list data structure: */
+
struct fork_info
{
- explicit fork_info (pid_t pid)
- : ptid (pid, pid)
+ explicit fork_info (pid_t pid, int fork_num)
+ : ptid (pid, pid), num (fork_num)
{
}
@@ -69,7 +71,7 @@ struct fork_info
ptid_t parent_ptid = null_ptid;
/* Convenient handle (GDB fork id). */
- int num = 0;
+ int num;
/* Convenient for info fork, saves having to actually switch
contexts. */
@@ -83,115 +85,253 @@ struct fork_info
int maxfd = 0;
};
-static std::list<fork_info> fork_list;
-static int highest_fork_num;
+/* Per-inferior checkpoint data. */
+
+struct checkpoint_inferior_data
+{
+ /* List of forks (checkpoints) in particular inferior. Once a
+ checkpoint has been created, fork_list will contain at least two
+ items, the first in the list will be the original (or, if not
+ original, then the oldest) fork. */
+ std::list<fork_info> fork_list;
+
+ /* Most recently assigned fork number; when 0, no checkpoints have
+ been created yet. */
+ int highest_fork_num = 0;
+};
+
+/* Per-inferior data key. */
+
+static const registry<inferior>::key<checkpoint_inferior_data>
+ checkpoint_inferior_data_key;
+
+/* Fetch per-inferior checkpoint data. It always returns a valid pointer
+ to a checkpoint_inferior_info struct. */
+
+static struct checkpoint_inferior_data *
+get_checkpoint_inferior_data (struct inferior *inf)
+{
+ struct checkpoint_inferior_data *data;
+
+ data = checkpoint_inferior_data_key.get (inf);
+ if (data == nullptr)
+ data = checkpoint_inferior_data_key.emplace (inf);
+
+ return data;
+}
+
+/* Return a reference to the per-inferior fork list. */
+
+static std::list<fork_info> &
+fork_list (inferior *inf)
+{
+ return get_checkpoint_inferior_data (inf)->fork_list;
+}
+
+/* Return a reference to 'highest_fork_num' for the given inferior INF. */
+
+static int &
+highest_fork_num (inferior *inf)
+{
+ return get_checkpoint_inferior_data (inf)->highest_fork_num;
+}
+
+/* Predicate which returns true when more than one inferior contains
+ a checkpoint, false otherwise. */
+
+static bool
+forks_exist_in_multiple_inferiors_p ()
+{
+ int count = 0;
+ for (inferior *inf : all_inferiors ())
+ {
+ if (forks_exist_p (inf))
+ count++;
+ if (count > 1)
+ return true;
+ }
+ return false;
+}
/* Fork list methods: */
-int
-forks_exist_p (void)
+/* Predicate which returns true if checkpoint(s) exist in the inferior
+ INF, false otherwise. */
+
+bool
+forks_exist_p (inferior *inf)
{
- return !fork_list.empty ();
+ return !fork_list (inf).empty ();
}
-/* Return the last fork in the list. */
+/* Return the last fork in the list for inferior INF. */
static struct fork_info *
-find_last_fork (void)
+find_last_fork (inferior *inf)
{
+ auto &fork_list = ::fork_list (inf);
+
if (fork_list.empty ())
return NULL;
return &fork_list.back ();
}
-/* Return true iff there's one fork in the list. */
+/* Return true iff there's one fork in the list for inferior INF. */
static bool
-one_fork_p ()
+one_fork_p (inferior *inf)
{
- return fork_list.size () == 1;
+ return fork_list (inf).size () == 1;
}
/* Add a new fork to the internal fork list. */
void
-add_fork (pid_t pid)
+add_fork (pid_t pid, inferior *inf)
{
- fork_list.emplace_back (pid);
-
- if (one_fork_p ())
- highest_fork_num = 0;
-
- fork_info *fp = &fork_list.back ();
- fp->num = ++highest_fork_num;
+ fork_list (inf).emplace_back (pid, ++highest_fork_num (inf));
}
+/* Delete a fork for PTID in inferior INF. When the last fork is
+ deleted, HIGHEST_FORK_NUM for the given inferior is reset to 0.
+ The fork list may also be made to be empty when only one fork
+ remains. */
+
static void
-delete_fork (ptid_t ptid)
+delete_fork (ptid_t ptid, inferior *inf)
{
linux_target->low_forget_process (ptid.pid ());
+ auto &fork_list = ::fork_list (inf);
for (auto it = fork_list.begin (); it != fork_list.end (); ++it)
if (it->ptid == ptid)
{
fork_list.erase (it);
+ if (fork_list.empty ())
+ {
+ /* Reset highest_fork_num. */
+ highest_fork_num (inf) = 0;
+ }
+
/* Special case: if there is now only one process in the list,
and if it is (hopefully!) the current inferior_ptid, then
remove it, leaving the list empty -- we're now down to the
default case of debugging a single process. */
- if (one_fork_p () && fork_list.front ().ptid == inferior_ptid)
+ if (one_fork_p (inf) && fork_list.front ().ptid == inferior_ptid)
{
/* Last fork -- delete from list and handle as solo
process (should be a safe recursion). */
- delete_fork (inferior_ptid);
+ delete_fork (inferior_ptid, inf);
}
return;
}
}
-/* Find a fork_info by matching PTID. */
-static struct fork_info *
+/* Find a fork_info and inferior by matching PTID. */
+
+static std::pair<fork_info *, inferior *>
find_fork_ptid (ptid_t ptid)
{
- for (fork_info &fi : fork_list)
- if (fi.ptid == ptid)
- return &fi;
+ for (inferior *inf : all_inferiors ())
+ {
+ for (fork_info &fi : fork_list (inf))
+ if (fi.ptid == ptid)
+ return { &fi, inf };
+ }
- return NULL;
+ return { nullptr, nullptr };
}
-/* Find a fork_info by matching ID. */
-static struct fork_info *
-find_fork_id (int num)
+/* Find a fork_info by matching NUM in inferior INF. */
+
+static fork_info *
+find_fork_id (inferior *inf, int num)
{
- for (fork_info &fi : fork_list)
+ for (fork_info &fi : fork_list (inf))
if (fi.num == num)
return &fi;
- return NULL;
+ return nullptr;
}
-/* Find a fork_info by matching pid. */
-extern struct fork_info *
+/* Find a fork_info and inferior by matching pid. */
+
+extern std::pair<fork_info *, inferior *>
find_fork_pid (pid_t pid)
{
- for (fork_info &fi : fork_list)
- if (pid == fi.ptid.pid ())
- return &fi;
+ for (inferior *inf : all_inferiors ())
+ {
+ for (fork_info &fi : fork_list (inf))
+ if (pid == fi.ptid.pid ())
+ return { &fi, inf };
+ }
- return NULL;
+ return { nullptr, nullptr };
}
-static ptid_t
-fork_id_to_ptid (int num)
+/* Parse a command argument representing a checkpoint id. This
+ can take one of two forms:
+
+ Num
+
+ -or-
+
+ Inf.Num
+
+ where Num is a non-negative decimal integer and Inf, if present, is
+ a positive decimal integer.
+
+ Return a pair with a pointer to the fork_info struct and pointer
+ to the inferior. This function will throw an error if there's
+ a problem with the parsing or if either the inferior or checkpoint
+ id does not exist. */
+
+static std::pair<fork_info *, inferior *>
+parse_checkpoint_id (const char *ckptstr)
{
- struct fork_info *fork = find_fork_id (num);
- if (fork)
- return fork->ptid;
+ const char *number = ckptstr;
+ const char *p1;
+ struct inferior *inf;
+
+ const char *dot = strchr (number, '.');
+
+ if (dot != nullptr)
+ {
+ /* Parse number to the left of the dot. */
+ int inf_num;
+
+ p1 = number;
+ inf_num = get_number_trailer (&p1, '.');
+ if (inf_num <= 0)
+ error (_("Inferior number must be a positive integer"));
+
+ inf = find_inferior_id (inf_num);
+ if (inf == NULL)
+ error (_("No inferior number '%d'"), inf_num);
+
+ p1 = dot + 1;
+ }
else
- return ptid_t (-1);
+ {
+ inf = current_inferior ();
+ p1 = number;
+ }
+
+ int fork_num = get_number_trailer (&p1, 0);
+ if (fork_num < 0)
+ error (_("Checkpoint number must be a non-negative integer"));
+
+ if (!forks_exist_p (inf))
+ error (_("Inferior %d has no checkpoints"), inf->num);
+
+ auto fork_ptr = find_fork_id (inf, fork_num);
+ if (fork_ptr == nullptr)
+ error (_("Invalid checkpoint number %d for inferior %d"),
+ fork_num, inf->num);
+
+ return { fork_ptr, inf };
}
/* Fork list <-> gdb interface. */
@@ -296,7 +436,7 @@ fork_save_infrun_state (struct fork_info *fp)
/* Kill 'em all, let God sort 'em out... */
void
-linux_fork_killall (void)
+linux_fork_killall (inferior *inf)
{
/* Walk list and kill every pid. No need to treat the
current inferior_ptid as special (we do not return a
@@ -304,6 +444,7 @@ linux_fork_killall (void)
or a parent, so may get a SIGCHLD from a previously
killed child. Wait them all out. */
+ auto &fork_list = ::fork_list (inf);
for (fork_info &fi : fork_list)
{
pid_t pid = fi.ptid.pid ();
@@ -322,6 +463,7 @@ linux_fork_killall (void)
/* Clear list, prepare to start fresh. */
fork_list.clear ();
+ highest_fork_num (inf) = 0;
}
/* The current inferior_ptid has exited, but there are other viable
@@ -329,7 +471,7 @@ linux_fork_killall (void)
first available. */
void
-linux_fork_mourn_inferior (void)
+linux_fork_mourn_inferior (inferior *inf)
{
struct fork_info *last;
int status;
@@ -341,23 +483,23 @@ linux_fork_mourn_inferior (void)
waitpid (inferior_ptid.pid (), &status, 0);
/* OK, presumably inferior_ptid is the one who has exited.
- We need to delete that one from the fork_list, and switch
+ We need to delete that one from the fork list, and switch
to the next available fork. */
- delete_fork (inferior_ptid);
+ delete_fork (inferior_ptid, inf);
/* There should still be a fork - if there's only one left,
delete_fork won't remove it, because we haven't updated
inferior_ptid yet. */
- gdb_assert (!fork_list.empty ());
+ gdb_assert (!fork_list (inf).empty ());
- last = find_last_fork ();
+ last = find_last_fork (inf);
fork_load_infrun_state (last);
gdb_printf (_("[Switching to %s]\n"),
target_pid_to_str (inferior_ptid).c_str ());
/* If there's only one fork, switch back to non-fork mode. */
- if (one_fork_p ())
- delete_fork (inferior_ptid);
+ if (one_fork_p (inf))
+ delete_fork (inferior_ptid, inf);
}
/* The current inferior_ptid is being detached, but there are other
@@ -365,13 +507,13 @@ linux_fork_mourn_inferior (void)
the first available. */
void
-linux_fork_detach (int from_tty, lwp_info *lp)
+linux_fork_detach (int from_tty, lwp_info *lp, inferior *inf)
{
gdb_assert (lp != nullptr);
gdb_assert (lp->ptid == inferior_ptid);
/* OK, inferior_ptid is the one we are detaching from. We need to
- delete it from the fork_list, and switch to the next available
+ delete it from the fork list, and switch to the next available
fork. But before doing the detach, do make sure that the lwp
hasn't exited or been terminated first. */
@@ -384,11 +526,12 @@ linux_fork_detach (int from_tty, lwp_info *lp)
target_pid_to_str (inferior_ptid).c_str ());
}
- delete_fork (inferior_ptid);
+ delete_fork (inferior_ptid, inf);
/* There should still be a fork - if there's only one left,
delete_fork won't remove it, because we haven't updated
inferior_ptid yet. */
+ auto &fork_list = ::fork_list (inf);
gdb_assert (!fork_list.empty ());
fork_load_infrun_state (&fork_list.front ());
@@ -398,8 +541,8 @@ linux_fork_detach (int from_tty, lwp_info *lp)
target_pid_to_str (inferior_ptid).c_str ());
/* If there's only one fork, switch back to non-fork mode. */
- if (one_fork_p ())
- delete_fork (inferior_ptid);
+ if (one_fork_p (inf))
+ delete_fork (inferior_ptid, inf);
}
/* Temporarily switch to the infrun state stored on the fork_info
@@ -412,19 +555,26 @@ class scoped_switch_fork_info
/* Switch to the infrun state held on the fork_info identified by
PPTID. If PPTID is the current inferior then no switch is done. */
explicit scoped_switch_fork_info (ptid_t pptid)
- : m_oldfp (nullptr)
+ : m_oldfp (nullptr), m_oldinf (nullptr)
{
if (pptid != inferior_ptid)
{
- struct fork_info *newfp = nullptr;
-
/* Switch to pptid. */
- m_oldfp = find_fork_ptid (inferior_ptid);
+ auto [oldfp, oldinf] = find_fork_ptid (inferior_ptid);
+ m_oldfp = oldfp;
gdb_assert (m_oldfp != nullptr);
- newfp = find_fork_ptid (pptid);
+ auto [newfp, newinf] = find_fork_ptid (pptid);
gdb_assert (newfp != nullptr);
fork_save_infrun_state (m_oldfp);
remove_breakpoints ();
+
+ if (oldinf != newinf)
+ {
+ thread_info *tp = any_thread_of_inferior (newinf);
+ switch_to_thread (tp);
+ m_oldinf = oldinf;
+ }
+
fork_load_infrun_state (newfp);
insert_breakpoints ();
}
@@ -434,12 +584,17 @@ class scoped_switch_fork_info
didn't need to switch states, then nothing is done here either. */
~scoped_switch_fork_info ()
{
- if (m_oldfp != nullptr)
+ if (m_oldinf != nullptr || m_oldfp != nullptr)
{
/* Switch back to inferior_ptid. */
try
{
remove_breakpoints ();
+ if (m_oldinf != nullptr)
+ {
+ thread_info *tp = any_thread_of_inferior (m_oldinf);
+ switch_to_thread (tp);
+ }
fork_load_infrun_state (m_oldfp);
insert_breakpoints ();
}
@@ -471,6 +626,7 @@ class scoped_switch_fork_info
we were already in the desired state, and nothing needs to be
restored. */
struct fork_info *m_oldfp;
+ inferior *m_oldinf;
};
static int
@@ -513,30 +669,35 @@ static void
delete_checkpoint_command (const char *args, int from_tty)
{
ptid_t ptid, pptid;
- struct fork_info *fi;
if (!args || !*args)
error (_("Requires argument (checkpoint id to delete)"));
- ptid = fork_id_to_ptid (parse_and_eval_long (args));
- if (ptid == minus_one_ptid)
- error (_("No such checkpoint id, %s"), args);
+ auto [fi, inf] = parse_checkpoint_id (args);
+ ptid = fi->ptid;
+ gdb_assert (fi != nullptr);
+ pptid = fi->parent_ptid;
- if (ptid == inferior_ptid)
- error (_("\
+ thread_info *inf_thr = any_thread_of_inferior (inf);
+ gdb_assert (inf_thr != nullptr);
+ if (ptid == inf_thr->ptid)
+ {
+ if (inf == current_inferior ())
+ error (_("\
Please switch to another checkpoint before deleting the current one"));
+ else
+ error (_("\
+Please switch to another checkpoint before deleting the current one\n\
+in inferior %d"), inf->num);
+ }
if (ptrace (PTRACE_KILL, ptid.pid (), 0, 0))
error (_("Unable to kill pid %s"), target_pid_to_str (ptid).c_str ());
- fi = find_fork_ptid (ptid);
- gdb_assert (fi);
- pptid = fi->parent_ptid;
-
if (from_tty)
gdb_printf (_("Killed %s\n"), target_pid_to_str (ptid).c_str ());
- delete_fork (ptid);
+ delete_fork (ptid, inf);
if (pptid == null_ptid)
{
@@ -554,7 +715,7 @@ Please switch to another checkpoint before deleting the current one"));
If fi->parent_ptid is a part of lwp and it is stopped, waitpid the
ptid. */
thread_info *parent = linux_target->find_thread (pptid);
- if ((parent == NULL && find_fork_ptid (pptid))
+ if ((parent == NULL && find_fork_ptid (pptid).first != nullptr)
|| (parent != NULL && parent->state == THREAD_STOPPED))
{
if (inferior_call_waitpid (pptid, ptid.pid ()))
@@ -571,9 +732,8 @@ detach_checkpoint_command (const char *args, int from_tty)
if (!args || !*args)
error (_("Requires argument (checkpoint id to detach)"));
- ptid = fork_id_to_ptid (parse_and_eval_long (args));
- if (ptid == minus_one_ptid)
- error (_("No such checkpoint id, %s"), args);
+ auto [fi, inf] = parse_checkpoint_id (args);
+ ptid = fi->ptid;
if (ptid == inferior_ptid)
error (_("\
@@ -585,7 +745,7 @@ Please switch to another checkpoint before detaching the current one"));
if (from_tty)
gdb_printf (_("Detached %s\n"), target_pid_to_str (ptid).c_str ());
- delete_fork (ptid);
+ delete_fork (ptid, current_inferior ());
}
/* Print information about currently known checkpoints. */
@@ -594,72 +754,96 @@ static void
info_checkpoints_command (const char *arg, int from_tty)
{
struct gdbarch *gdbarch = get_current_arch ();
- int requested = -1;
+ struct inferior *cur_inf = current_inferior ();
+ inferior *req_inf = nullptr;
+ fork_info *req_fi = nullptr;
bool printed = false;
if (arg && *arg)
- requested = (int) parse_and_eval_long (arg);
+ std::tie (req_fi, req_inf) = parse_checkpoint_id (arg);
- for (const fork_info &fi : fork_list)
+ /* Figure out whether to print the inferior number in the
+ checkpoint list. */
+ bool print_inf = (!forks_exist_p (current_inferior ())
+ || forks_exist_in_multiple_inferiors_p ());
+
+ for (inferior *inf : all_inferiors ())
{
- if (requested > 0 && fi.num != requested)
+ if (req_inf != nullptr && req_inf != inf)
continue;
- printed = true;
-
- bool is_current = fi.ptid == inferior_ptid;
- if (is_current)
- gdb_printf ("* ");
- else
- gdb_printf (" ");
- gdb_printf ("%d %s", fi.num, target_pid_to_str (fi.ptid).c_str ());
- if (fi.num == 0)
- gdb_printf (_(" (main process)"));
+ scoped_restore_current_pspace_and_thread restore_pspace_thread;
+ switch_to_program_space_and_thread (inf->pspace);
- if (is_current && inferior_thread ()->state == THREAD_RUNNING)
+ for (const fork_info &fi : fork_list (inf))
{
- gdb_printf (_(" <running>\n"));
- continue;
+ if (req_fi != nullptr && req_fi != &fi)
+ continue;
+ printed = true;
+
+ thread_info *t = any_thread_of_inferior (inf);
+ bool is_current = fi.ptid == t->ptid;
+ if (is_current && cur_inf == inf)
+ gdb_printf ("*");
+ else
+ gdb_printf (" ");
+
+ if (print_inf)
+ gdb_printf ("%3d.%-2d", inf->num, fi.num);
+ else
+ gdb_printf ("%3d ", fi.num);
+
+ /* Print out state associated with current checkpoint. */
+ if (is_current)
+ {
+ gdb_printf ("A");
+ if (t->state == THREAD_RUNNING)
+ gdb_printf ("R");
+ else
+ gdb_printf (" ");
+ gdb_printf (" ");
+ }
+ else
+ gdb_printf (" ");
+
+ gdb_printf ("%s", target_pid_to_str (fi.ptid).c_str ());
+
+ gdb_printf (_(" at "));
+ ULONGEST pc
+ = (is_current
+ ? regcache_read_pc (get_thread_regcache (t))
+ : fi.pc);
+ gdb_puts (paddress (gdbarch, pc));
+
+ symtab_and_line sal = find_pc_line (pc, 0);
+ if (sal.symtab)
+ gdb_printf (_(", file %s"),
+ symtab_to_filename_for_display (sal.symtab));
+ if (sal.line)
+ gdb_printf (_(", line %d"), sal.line);
+ if (!sal.symtab && !sal.line)
+ {
+ struct bound_minimal_symbol msym;
+
+ msym = lookup_minimal_symbol_by_pc (pc);
+ if (msym.minsym)
+ gdb_printf (", <%s>", msym.minsym->linkage_name ());
+ }
+
+ gdb_putc ('\n');
}
-
- gdb_printf (_(" at "));
- ULONGEST pc
- = (is_current
- ? regcache_read_pc (get_thread_regcache (inferior_thread ()))
- : fi.pc);
- gdb_puts (paddress (gdbarch, pc));
-
- symtab_and_line sal = find_pc_line (pc, 0);
- if (sal.symtab)
- gdb_printf (_(", file %s"),
- symtab_to_filename_for_display (sal.symtab));
- if (sal.line)
- gdb_printf (_(", line %d"), sal.line);
- if (!sal.symtab && !sal.line)
- {
- struct bound_minimal_symbol msym;
-
- msym = lookup_minimal_symbol_by_pc (pc);
- if (msym.minsym)
- gdb_printf (", <%s>", msym.minsym->linkage_name ());
- }
-
- gdb_putc ('\n');
}
if (!printed)
{
- if (requested > 0)
- gdb_printf (_("No checkpoint number %d.\n"), requested);
- else
- gdb_printf (_("No checkpoints.\n"));
+ gdb_printf (_("No checkpoints.\n"));
}
}
/* The PID of the process we're checkpointing. */
static int checkpointing_pid = 0;
-int
+bool
linux_fork_checkpointing_p (int pid)
{
return (checkpointing_pid == pid);
@@ -689,17 +873,16 @@ checkpoint_command (const char *args, int from_tty)
struct target_waitstatus last_target_waitstatus;
ptid_t last_target_ptid;
struct value *fork_fn = NULL, *ret;
- struct fork_info *fp;
pid_t retpid;
- if (!target_has_execution ())
+ if (!target_has_execution ())
error (_("The program is not being run."));
/* Ensure that the inferior is not multithreaded. */
update_thread_list ();
if (inf_has_multiple_threads ())
error (_("checkpoint: can't checkpoint multiple threads."));
-
+
/* Make the inferior fork, record its (and gdb's) state. */
if (lookup_minimal_symbol ("fork", NULL, NULL).minsym != NULL)
@@ -727,14 +910,22 @@ checkpoint_command (const char *args, int from_tty)
retpid = value_as_long (ret);
get_last_target_status (nullptr, &last_target_ptid, &last_target_waitstatus);
- fp = find_fork_pid (retpid);
+ auto [fp, inf] = find_fork_pid (retpid);
+
+ if (!fp)
+ error (_("Failed to find new fork"));
if (from_tty)
{
int parent_pid;
- gdb_printf (_("checkpoint %d: fork returned pid %ld.\n"),
- fp != NULL ? fp->num : -1, (long) retpid);
+ gdb_printf (_("checkpoint "));
+ if (forks_exist_in_multiple_inferiors_p ())
+ gdb_printf ("%d.%d: ", inf->num, fp->num);
+ else
+ gdb_printf ("%d: ", fp->num);
+ gdb_printf (_("fork returned pid %ld.\n"), (long) retpid);
+
if (info_verbose)
{
parent_pid = last_target_ptid.lwp ();
@@ -745,15 +936,12 @@ checkpoint_command (const char *args, int from_tty)
}
}
- if (!fp)
- error (_("Failed to find new fork"));
-
- if (one_fork_p ())
+ if (one_fork_p (inf))
{
/* 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_list.emplace_front (inferior_ptid.pid ());
+ list was hitherto empty), then add inferior_ptid as a special
+ zeroeth fork id. */
+ fork_list (inf).emplace_front (inferior_ptid.pid (), 0);
}
fork_save_infrun_state (fp);
@@ -761,40 +949,53 @@ checkpoint_command (const char *args, int from_tty)
}
static void
-linux_fork_context (struct fork_info *newfp, int from_tty)
+linux_fork_context (struct fork_info *newfp, int from_tty, inferior *newinf)
{
- /* Now we attempt to switch processes. */
- struct fork_info *oldfp;
+ bool inferior_changed = false;
+ /* Now we attempt to switch processes. */
gdb_assert (newfp != NULL);
- oldfp = find_fork_ptid (inferior_ptid);
- gdb_assert (oldfp != NULL);
+ if (newinf != current_inferior ())
+ {
+ thread_info *tp = any_thread_of_inferior (newinf);
+ switch_to_thread (tp);
+ inferior_changed = true;
+ }
- fork_save_infrun_state (oldfp);
- remove_breakpoints ();
- fork_load_infrun_state (newfp);
- insert_breakpoints ();
+ auto [oldfp, oldinf] = find_fork_ptid (inferior_ptid);
+ gdb_assert (oldfp != NULL);
- gdb_printf (_("Switching to %s\n"),
- target_pid_to_str (inferior_ptid).c_str ());
+ if (oldfp == newfp)
+ {
+ if (!inferior_changed)
+ error (_("Already using checkpoint %d"), oldfp->num);
+ }
+ else
+ {
+ fork_save_infrun_state (oldfp);
+ remove_breakpoints ();
+ fork_load_infrun_state (newfp);
+ insert_breakpoints ();
+ if (!inferior_changed)
+ gdb_printf (_("Switching to %s\n"),
+ target_pid_to_str (inferior_ptid).c_str ());
+ }
- print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1);
+ notify_user_selected_context_changed
+ (inferior_changed ? (USER_SELECTED_INFERIOR | USER_SELECTED_FRAME)
+ : USER_SELECTED_FRAME);
}
/* Switch inferior process (checkpoint) context, by checkpoint id. */
static void
restart_command (const char *args, int from_tty)
{
- struct fork_info *fp;
-
if (!args || !*args)
error (_("Requires argument (checkpoint id to restart)"));
- if ((fp = find_fork_id (parse_and_eval_long (args))) == NULL)
- error (_("Not found: checkpoint id %s"), args);
-
- linux_fork_context (fp, from_tty);
+ auto [fp, inf] = parse_checkpoint_id (args);
+ linux_fork_context (fp, from_tty, inf);
}
void _initialize_linux_fork ();
@@ -22,12 +22,13 @@
struct fork_info;
struct lwp_info;
-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);
-extern void linux_fork_detach (int, lwp_info *);
-extern int forks_exist_p (void);
-extern int linux_fork_checkpointing_p (int);
+class inferior;
+extern void add_fork (pid_t, inferior *inf);
+extern std::pair<fork_info *, inferior *> find_fork_pid (pid_t);
+extern void linux_fork_killall (inferior *inf);
+extern void linux_fork_mourn_inferior (inferior *inf);
+extern void linux_fork_detach (int, lwp_info *, inferior *inf);
+extern bool forks_exist_p (inferior *inf);
+extern bool linux_fork_checkpointing_p (int);
#endif /* LINUX_FORK_H */
@@ -1552,13 +1552,13 @@ linux_nat_target::detach (inferior *inf, int from_tty)
gdb_assert (num_lwps (pid) == 1
|| (target_is_non_stop_p () && num_lwps (pid) == 0));
- if (pid == inferior_ptid.pid () && forks_exist_p ())
+ if (forks_exist_p (inf))
{
/* Multi-fork case. The current inferior_ptid is being detached
from, but there are other viable forks to debug. Detach from
the current fork, and context-switch to the first
available. */
- linux_fork_detach (from_tty, find_lwp_pid (ptid_t (pid)));
+ linux_fork_detach (from_tty, find_lwp_pid (ptid_t (pid)), inf);
}
else
{
@@ -2076,8 +2076,12 @@ linux_handle_extended_wait (struct lwp_info *lp, int status)
detach_breakpoints (ptid_t (new_pid, new_pid));
/* Retain child fork in ptrace (stopped) state. */
- if (!find_fork_pid (new_pid))
- add_fork (new_pid);
+ if (find_fork_pid (new_pid).first == nullptr)
+ {
+ struct inferior *inf = find_inferior_ptid (linux_target,
+ lp->ptid);
+ add_fork (new_pid, inf);
+ }
/* Report as spurious, so that infrun doesn't want to follow
this fork. We're actually doing an infcall in
@@ -3757,8 +3761,8 @@ linux_nat_target::kill ()
parent will be sleeping if this is a vfork. */
iterate_over_lwps (pid_ptid, kill_unfollowed_child_callback);
- if (forks_exist_p ())
- linux_fork_killall ();
+ if (forks_exist_p (current_inferior ()))
+ linux_fork_killall (current_inferior ());
else
{
/* Stop all threads before killing them, since ptrace requires
@@ -3789,14 +3793,14 @@ linux_nat_target::mourn_inferior ()
close_proc_mem_file (pid);
- if (! forks_exist_p ())
+ if (! forks_exist_p (current_inferior ()))
/* Normal case, no other forks available. */
inf_ptrace_target::mourn_inferior ();
else
/* Multi-fork case. The current inferior_ptid has exited, but
there are other viable forks to debug. Delete the exiting
one and context-switch to the first available. */
- linux_fork_mourn_inferior ();
+ linux_fork_mourn_inferior (current_inferior ());
/* Let the arch-specific native code know this process is gone. */
linux_target->low_forget_process (pid);
@@ -274,17 +274,17 @@ gdb_test "kill" "" "kill all one" \
# and confirm that all are gone
#
-gdb_test "restart 0" "Not found.*" "no more checkpoint 0"
-gdb_test "restart 1" "Not found.*" "no more checkpoint 1"
-gdb_test "restart 2" "Not found.*" "no more checkpoint 2"
-gdb_test "restart 3" "Not found.*" "no more checkpoint 3"
-gdb_test "restart 4" "Not found.*" "no more checkpoint 4"
-gdb_test "restart 5" "Not found.*" "no more checkpoint 5"
-gdb_test "restart 6" "Not found.*" "no more checkpoint 6"
-gdb_test "restart 7" "Not found.*" "no more checkpoint 7"
-gdb_test "restart 8" "Not found.*" "no more checkpoint 8"
-gdb_test "restart 9" "Not found.*" "no more checkpoint 9"
-gdb_test "restart 10" "Not found.*" "no more checkpoint 10"
+gdb_test "restart 0" "has no checkpoints" "no more checkpoint 0"
+gdb_test "restart 1" "has no checkpoints" "no more checkpoint 1"
+gdb_test "restart 2" "has no checkpoints" "no more checkpoint 2"
+gdb_test "restart 3" "has no checkpoints" "no more checkpoint 3"
+gdb_test "restart 4" "has no checkpoints" "no more checkpoint 4"
+gdb_test "restart 5" "has no checkpoints" "no more checkpoint 5"
+gdb_test "restart 6" "has no checkpoints" "no more checkpoint 6"
+gdb_test "restart 7" "has no checkpoints" "no more checkpoint 7"
+gdb_test "restart 8" "has no checkpoints" "no more checkpoint 8"
+gdb_test "restart 9" "has no checkpoints" "no more checkpoint 9"
+gdb_test "restart 10" "has no checkpoints" "no more checkpoint 10"
#
# Now let's try setting a large number of checkpoints (>600)
@@ -309,7 +309,7 @@ gdb_test "continue" "breakpoint 2.*" "break2 with many checkpoints"
set count 0
set msg "info checkpoints with at least 600 checkpoints"
gdb_test_multiple "info checkpoints" $msg {
- -re " $decimal process \[^\r\]*\r\n" {
+ -re " $decimal A? *process \[^\r\]*\r\n" {
incr count
exp_continue
}
new file mode 100644
@@ -0,0 +1,687 @@
+# Copyright 2009-2024 Free Software Foundation, Inc.
+
+# 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/>.
+
+# This file tests various scenarios involving multiple inferiors
+# and the checkpoint command.
+
+# Checkpoint support works only on Linux.
+require {istarget "*-*-linux*"}
+
+# Checkpoint support is implemented for the (Linux) native target,
+# which is indicated when [target_info gdb_protocol] returns the empty
+# string.
+if { [target_info gdb_protocol] != "" } {
+ return
+}
+
+set testfile "checkpoint-multi"
+
+set exec1 "hello"
+set srcfile1 ${exec1}.c
+set binfile1 [standard_output_file ${exec1}]
+
+set exec2 "goodbye"
+set srcfile2 ${exec2}.c
+set binfile2 [standard_output_file ${exec2}]
+
+set exec3 "hangout"
+set srcfile3 ${exec3}.c
+set binfile3 [standard_output_file ${exec3}]
+
+if { [build_executable ${testfile}.exp ${exec1} "${srcfile1}" {debug}] == -1 } {
+ return -1
+}
+
+if { [build_executable ${testfile}.exp ${exec2} "${srcfile2}" {debug}] == -1 } {
+ return -1
+}
+
+if { [build_executable ${testfile}.exp ${exec3} "${srcfile3}" {debug}] == -1 } {
+ return -1
+}
+
+# Start two inferiors, place a checkpoint on inferior 2, but switch
+# back to inferior 1.
+proc start_2_inferiors_checkpoint_on_inf_2 {} {
+ clean_restart $::exec1
+
+ # Start inferior 1.
+ if {[gdb_start_cmd] < 0} {
+ fail "start first inferior"
+ } else {
+ gdb_test "" "main.*" "start first inferior"
+ }
+
+ # Add a new inferior and exec into it.
+ gdb_test "add-inferior -exec $::binfile2" \
+ "Added inferior 2.*" \
+ "add inferior 2 with -exec $::exec2"
+
+ # Check that we have multiple inferiors.
+ gdb_test "info inferiors" \
+ "Executable.*$::exec1.*$::exec2.*"
+
+ # Switch to inferior 2.
+ gdb_test "inferior 2" \
+ "Switching to inferior 2.*$::exec2.*"
+
+ # Start inferior 2:
+ if {[gdb_start_cmd] < 0} {
+ fail "start second inferior"
+ } else {
+ gdb_test "" "main.*" "start second inferior"
+ }
+
+ # Set a checkpoint in inferior 2
+ gdb_test "checkpoint" "\[Cc\]heckpoint 1: fork returned pid $::decimal.*"
+
+ # Step one line in inferior 2.
+ gdb_test "step" "glob = 46;"
+
+ # Switch back to inferior 1.
+ gdb_test "inferior 1" "Switching to inferior 1.*$::exec1.*"
+}
+
+# Start two inferiors, place a checkpoint on inferior 2, but switch
+# back to inferior 1. This is like the one above, except that it
+# swaps the executables loaded into inferior 1 and inferior 2. This
+# is important for being able to test "continue to exit". (Because...
+# hello.c has an infinite loop, but goodbye.c doesn't. In order to
+# test "continue to exit", we need to continue in an executable which
+# will actually exit.)
+
+proc start_2_inferiors_checkpoint_on_inf_2_alt {} {
+ clean_restart $::exec2
+
+ # Start inferior 1.
+ if {[gdb_start_cmd] < 0} {
+ fail "start first inferior"
+ } else {
+ gdb_test "" "main.*" "start first inferior"
+ }
+
+ # Add a new inferior and exec exec1 into it.
+ gdb_test "add-inferior -exec $::binfile1" \
+ "Added inferior 2.*" \
+ "add inferior 2 with -exec $::exec1"
+
+ # Check that we have two inferiors.
+ gdb_test "info inferiors" \
+ "Executable.*$::exec2.*$::exec1.*"
+
+ # Switch to inferior 2.
+ gdb_test "inferior 2" \
+ "Switching to inferior 2.*$::exec1.*"
+
+ # Start inferior 2:
+ if {[gdb_start_cmd] < 0} {
+ fail "start second inferior"
+ } else {
+ gdb_test "" "main.*" "start second inferior"
+ }
+
+ # Set a checkpoint in inferior 2
+ gdb_test "checkpoint" "\[Cc\]heckpoint 1: fork returned pid $::decimal.*"
+
+ # next one line in inferior 2.
+ gdb_test "next" "bar\\(\\).*"
+
+ # Switch back to inferior 1.
+ gdb_test "inferior 1" "Switching to inferior 1.*$::exec2.*"
+}
+
+with_test_prefix "check detach on non-checkpointed inferior" {
+ start_2_inferiors_checkpoint_on_inf_2
+ gdb_test "detach" "Detaching from program.*$::exec1.*Inferior 1.*detached.*"
+}
+
+with_test_prefix "check kill on non-checkpointed inferior" {
+ start_2_inferiors_checkpoint_on_inf_2
+ gdb_test "kill" "" "kill non-checkpointed inferior" \
+ "Kill the program being debugged.*y or n. $" "y"
+}
+
+with_test_prefix "check restart 0 on non-checkpointed inferior" {
+ start_2_inferiors_checkpoint_on_inf_2
+ gdb_test "restart 0" "Inferior 1 has no checkpoints"
+ gdb_test "restart 2.0" "Switching to inferior 2.*?goodbye.*?#0 +mailand .*?glob = 46;.*"
+}
+
+with_test_prefix "check restart 1 on non-checkpointed inferior" {
+ start_2_inferiors_checkpoint_on_inf_2
+ gdb_test "restart 1" "Inferior 1 has no checkpoints"
+ gdb_test "restart 2.1" "Switching to inferior 2.*?goodbye.*?#0 +main .*?mailand\\(\\);.*"
+}
+
+with_test_prefix "check continue to exit on non-checkpointed inferior" {
+ start_2_inferiors_checkpoint_on_inf_2_alt
+ gdb_test "continue" "Inferior 1.*? exited normally.*"
+}
+
+set proc_re "(?:process $::decimal|Thread $::hex \\(LWP $::decimal\\))"
+set main_proc "\\(main process\\)"
+set hello_c "hello\\.c"
+set goodbye_c "goodbye\\.c"
+set hangout_c "hangout\\.c"
+
+with_test_prefix "two inferiors with checkpoints" {
+ start_2_inferiors_checkpoint_on_inf_2
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 2.0 A $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2.1 $proc_re at $::hex, file.*?$goodbye_c.*?"] \
+ "info checkpoints 1"
+ gdb_test "checkpoint" "\[Cc\]heckpoint 1\\.1: fork returned pid $::decimal.*" \
+ "checkpoint in inferior 1"
+ gdb_test "info checkpoints" \
+ [multi_line \
+ "\\* 1\\.0 A $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.1 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 2\\.0 A $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.1 $proc_re at $::hex, file.*?$goodbye_c.*?"] \
+ "info checkpoints 2"
+ gdb_test "restart 0" "Already using checkpoint 0"
+ gdb_test "restart 2.0" \
+ "\\\[Switching to inferior 2.*?mailand.*?glob = 46;.*"
+ gdb_test "next" "\}"
+
+ gdb_test "restart 1" "^Switching to $proc_re.*?#0 main \\(\\) at.*?$goodbye_c.*mailand\\(\\);"
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 1\\.0 A $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.1 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 2\\.0 $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ "\\* 2\\.1 A $proc_re at $::hex, file.*?$goodbye_c.*?"] \
+ "info checkpoints 3"
+
+ # Doing "info_checkpoints" twice in a row might seem pointless,
+ # but during work on making the checkpoint code inferior aware,
+ # there was a point at which doing it twice in a row did not
+ # produce the same output.
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 1\\.0 A $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.1 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 2\\.0 $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ "\\* 2\\.1 A $proc_re at $::hex, file.*?$goodbye_c.*?"] \
+ "info checkpoints 4"
+
+ # Switch back to checkpoint 0; again, there should be no
+ # "Switching to inferior" message.
+ gdb_test "restart 0" "^Switching to $proc_re.*?#0 mailand \\(\\) at.*?$goodbye_c.*\}" \
+ "restart 0 #2"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 1\\.0 A $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.1 $proc_re at $::hex, file.*?$hello_c.*?" \
+ "\\* 2\\.0 A $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.1 $proc_re at $::hex, file.*?$goodbye_c.*?"] \
+ "info checkpoints 5"
+
+ # Try switching to invalid checkpoints:
+ gdb_test "restart 3" "Invalid checkpoint number 3 for inferior 2"
+ gdb_test "restart 2" "Invalid checkpoint number 2 for inferior 2"
+ gdb_test "restart -1" "Checkpoint number must be a non-negative integer"
+ gdb_test "restart 2.3" "Invalid checkpoint number 3 for inferior 2"
+ gdb_test "restart 3.0" "No inferior number '3'"
+ gdb_test "restart 1.2" "Invalid checkpoint number 2 for inferior 1"
+ gdb_test "restart 1.3" "Invalid checkpoint number 3 for inferior 1"
+ gdb_test "restart 1.-1" "Checkpoint number must be a non-negative integer"
+ gdb_test "restart -1.0" "Inferior number must be a positive integer"
+
+ # Switch to checkpoint 3; this time, we should see a "Switching to
+ # inferior" message.
+ gdb_test "restart 1.1" \
+ "\\\[Switching to inferior 1.*?main.*?$hello_c.*?alarm \\(240\\);"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 1\\.0 $proc_re at $::hex, file.*?$hello_c.*?" \
+ "\\* 1\\.1 A $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 2\\.0 A $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.1 $proc_re at $::hex, file.*?$goodbye_c.*?"] \
+ "info checkpoints 6"
+
+ gdb_test "restart 2.1" \
+ "Switching to inferior 2.*?#0 main \\(\\) at.*?$goodbye_c.*mailand\\(\\);"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 1\\.0 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.1 A $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 2\\.0 $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ "\\* 2\\.1 A $proc_re at $::hex, file.*?$goodbye_c.*?"] \
+ "info checkpoints 7"
+
+ gdb_test "checkpoint" "\[Cc\]heckpoint 2\\.2: fork returned pid $::decimal.*" \
+ "second checkpoint in inferior 2"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 1\\.0 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.1 A $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 2\\.0 $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ "\\* 2\\.1 A $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.2 $proc_re at $::hex, file.*?$goodbye_c.*?"] \
+ "info checkpoints 8"
+
+ gdb_test "checkpoint" "\[Cc\]heckpoint 2.3: fork returned pid $::decimal.*" \
+ "third checkpoint in inferior 2"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 1\\.0 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.1 A $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 2\\.0 $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ "\\* 2\\.1 A $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.2 $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.3 $proc_re at $::hex, file.*?$goodbye_c.*?"] \
+ "info checkpoints 9"
+
+ gdb_test "continue" \
+ "Inferior 2 \\(process $decimal\\) exited normally.*?Switching to $proc_re.*?" \
+ "continue to exit in checkpoint 2.1"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 1\\.0 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.1 A $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 2\\.0 $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.2 $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ "\\* 2\\.3 A $proc_re at $::hex, file.*?$goodbye_c.*?"] \
+ "info checkpoints 10"
+
+ gdb_test "continue" \
+ "Inferior 2 \\(process $decimal\\) exited normally.*?Switching to process $decimal.*?" \
+ "continue to exit in checkpoint 2.3"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 1\\.0 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.1 A $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 2\\.0 $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ "\\* 2\\.2 A $proc_re at $::hex, file.*?$goodbye_c.*?"] \
+ "info checkpoints 11"
+
+ gdb_test "continue" \
+ "Inferior 2 \\(process $decimal\\) exited normally.*?Switching to process $decimal.*?" \
+ "continue to exit in checkpoint 2.2"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 1\\.0 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.1 A $proc_re at $::hex, file.*?$hello_c.*?"] \
+ "info checkpoints 12"
+
+ gdb_test "checkpoint" "\[Cc\]heckpoint 2.1: fork returned pid $::decimal.*" \
+ "fourth checkpoint in inferior 2"
+
+ gdb_test "checkpoint" "\[Cc\]heckpoint 2.2: fork returned pid $::decimal.*" \
+ "fifth checkpoint in inferior 2"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 1\\.0 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.1 A $proc_re at $::hex, file.*?$hello_c.*?" \
+ "\\* 2\\.0 A $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.1 $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.2 $proc_re at $::hex, file.*?$goodbye_c.*?"] \
+ "info checkpoints 13"
+
+ gdb_test "delete checkpoint 2.0" \
+ "Please switch to another checkpoint before deleting the current one"
+
+ gdb_test "restart 2.1" \
+ "^Switching to process.*?#0 mailand \\(\\) at.*?$goodbye_c.*\}" \
+ "restart 2.1 #2"
+
+ gdb_test "delete checkpoint 2.0" \
+ "Killed process $::decimal" \
+ "delete checkpoint 2.0 #2"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 1\\.0 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.1 A $proc_re at $::hex, file.*?$hello_c.*?" \
+ "\\* 2\\.1 A $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.2 $proc_re at $::hex, file.*?$goodbye_c.*?"] \
+ "info checkpoints 14"
+
+ gdb_test "delete checkpoint 2.2" \
+ "Killed process $::decimal"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 1\\.0 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.1 A $proc_re at $::hex, file.*?$hello_c.*?"] \
+ "info checkpoints 15"
+
+ gdb_test "checkpoint" "\[Cc\]heckpoint 2.1: fork returned pid $::decimal.*" \
+ "sixth checkpoint in inferior 2"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 1\\.0 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.1 A $proc_re at $::hex, file.*?$hello_c.*?" \
+ "\\* 2\\.0 A $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.1 $proc_re at $::hex, file.*?$goodbye_c.*?"] \
+ "info checkpoints 16"
+
+ gdb_test "inferior 1" "Switching to inferior 1.*?alarm \\(240\\);" \
+ "inferior 1 #2"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 1\\.0 $proc_re at $::hex, file.*?$hello_c.*?" \
+ "\\* 1\\.1 A $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 2\\.0 A $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.1 $proc_re at $::hex, file.*?$goodbye_c.*?"] \
+ "info checkpoints 17"
+
+ gdb_test "kill" "\\\[Inferior 1 \\(process $::decimal\\) killed\\\]" \
+ "kill inferior 1" \
+ "Kill the program being debugged.*y or n. $" "y"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 2\\.0 A $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.1 $proc_re at $::hex, file.*?$goodbye_c.*?"] \
+ "info checkpoints 18"
+
+ gdb_test "checkpoint" "The program is not being run\\." \
+ "checkpoint in non-running inferior"
+
+ gdb_test "start" "Starting program.*?hello.*?alarm \\(240\\);"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 2\\.0 A $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.1 $proc_re at $::hex, file.*?$goodbye_c.*?"] \
+ "info checkpoints 19"
+
+ gdb_test "checkpoint" "\[Cc\]heckpoint 1.1: fork returned pid $::decimal.*" \
+ "second checkpoint in inferior 1"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ "\\* 1\\.0 A $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.1 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 2\\.0 A $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.1 $proc_re at $::hex, file.*?$goodbye_c.*?"] \
+ "info checkpoints 20"
+}
+
+with_test_prefix "three inferiors with checkpoints" {
+ start_2_inferiors_checkpoint_on_inf_2
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 2\\.0 A $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.1 $proc_re at $::hex, file.*?$goodbye_c.*?"] \
+ "info checkpoints 1"
+
+ # Add a third inferior and exec into it.
+ gdb_test "add-inferior -exec $::binfile3" \
+ "Added inferior 3.*" \
+ "add inferior 3 with -exec $::exec3"
+
+ # Check that we have three inferiors.
+ gdb_test "info inferiors" \
+ "Executable.*?\\* 1 .*?$::exec1.*? 2 .*?$::exec2.*? 3 .*?$::exec3.*?" \
+ "check for three inferiors"
+
+ # Switch to inferior 3.
+ gdb_test "inferior 3" \
+ "Switching to inferior 3.*$::exec3.*"
+
+ # Start inferior 2:
+ if {[gdb_start_cmd] < 0} {
+ fail "start third inferior"
+ } else {
+ gdb_test "" "main.*" "start third inferior"
+ }
+
+ gdb_test "checkpoint" "\[Cc\]heckpoint 3\\.1: fork returned pid $::decimal.*" \
+ "first checkpoint in inferior 3"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 2\\.0 A $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.1 $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ "\\* 3\\.0 A $proc_re at $::hex, file.*?$hangout_c.*?" \
+ " 3\\.1 $proc_re at $::hex, file.*?$hangout_c.*?"] \
+ "info checkpoints 2"
+
+ gdb_test "inferior 1" "Switching to inferior 1.*?alarm \\(240\\);" \
+ "inferior 1 #2"
+
+ gdb_test "checkpoint" "\[Cc\]heckpoint 1\\.1: fork returned pid $::decimal.*" \
+ "first checkpoint in inferior 1"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ "\\* 1\\.0 A $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.1 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 2\\.0 A $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.1 $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 3\\.0 A $proc_re at $::hex, file.*?$hangout_c.*?" \
+ " 3\\.1 $proc_re at $::hex, file.*?$hangout_c.*?"] \
+ "info checkpoints 3"
+
+ gdb_test "restart 2.1" \
+ "Switching to inferior 2.*?#0 main \\(\\) at.*?$goodbye_c.*mailand\\(\\);" \
+ "restart 1"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 1\\.0 A $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.1 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 2\\.0 $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ "\\* 2\\.1 A $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 3\\.0 A $proc_re at $::hex, file.*?$hangout_c.*?" \
+ " 3\\.1 $proc_re at $::hex, file.*?$hangout_c.*?"] \
+ "info checkpoints 4"
+
+ gdb_test "next" "foo\\(glob\\);"
+
+ gdb_test "checkpoint" "\[Cc\]heckpoint 2\\.2: fork returned pid $::decimal.*" \
+ "second checkpoint in inferior 2"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 1\\.0 A $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.1 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 2\\.0 $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ "\\* 2\\.1 A $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.2 $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 3\\.0 A $proc_re at $::hex, file.*?$hangout_c.*?" \
+ " 3\\.1 $proc_re at $::hex, file.*?$hangout_c.*?"] \
+ "info checkpoints 5"
+
+ gdb_test "inferior 3" "Switching to inferior 3.*?alarm \\(30\\);" \
+ "inferior 3 #2"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 1\\.0 A $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.1 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 2\\.0 $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.1 A $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.2 $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ "\\* 3\\.0 A $proc_re at $::hex, file.*?$hangout_c.*?" \
+ " 3\\.1 $proc_re at $::hex, file.*?$hangout_c.*?"] \
+ "info checkpoints 6"
+
+ gdb_test "kill" "\\\[Inferior 3 \\(process $::decimal\\) killed\\\]" \
+ "kill inferior 3" \
+ "Kill the program being debugged.*y or n. $" "y"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 1\\.0 A $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.1 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 2\\.0 $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.1 A $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.2 $proc_re at $::hex, file.*?$goodbye_c.*?" ]\
+ "info checkpoints 7"
+
+ gdb_test "delete checkpoint 0" \
+ "Inferior 3 has no checkpoints"
+ gdb_test "delete checkpoint 2.0" \
+ "Killed process $::decimal"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 1\\.0 A $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.1 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 2\\.1 A $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.2 $proc_re at $::hex, file.*?$goodbye_c.*?" ]\
+ "info checkpoints 8"
+
+ gdb_test "restart 2.2" \
+ "Switching to inferior 2.*?#0 main \\(\\) at.*?$goodbye_c.*foo\\(glob\\);"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 1\\.0 A $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.1 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 2\\.1 $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ "\\* 2\\.2 A $proc_re at $::hex, file.*?$goodbye_c.*?" ]\
+ "info checkpoints 9"
+
+ gdb_test "inferior 3" "\\\[Switching to inferior 3 \\\[<null>\\\] \\(.*?$::exec3\\)\\\]" \
+ "inferior 3 #3"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 1\\.0 A $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.1 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 2\\.1 $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.2 A $proc_re at $::hex, file.*?$goodbye_c.*?" ]\
+ "info checkpoints 10"
+
+ gdb_test "start" "Starting program.*?hangout.*?alarm \\(30\\);"
+
+ gdb_test "checkpoint" "\[Cc\]heckpoint 3\\.1: fork returned pid $::decimal.*" \
+ "second checkpoint in inferior 3"
+
+ gdb_test "checkpoint" "\[Cc\]heckpoint 3\\.2: fork returned pid $::decimal.*" \
+ "third checkpoint in inferior 3"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 1\\.0 A $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.1 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 2\\.1 $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.2 A $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ "\\* 3\\.0 A $proc_re at $::hex, file.*?$hangout_c.*?" \
+ " 3\\.1 $proc_re at $::hex, file.*?$hangout_c.*?" \
+ " 3\\.2 $proc_re at $::hex, file.*?$hangout_c.*?"] \
+ "info checkpoints 11"
+
+ gdb_test "delete checkpoint 1" \
+ "Killed process $::decimal"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 1\\.0 A $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.1 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 2\\.1 $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.2 A $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ "\\* 3\\.0 A $proc_re at $::hex, file.*?$hangout_c.*?" \
+ " 3\\.2 $proc_re at $::hex, file.*?$hangout_c.*?"] \
+ "info checkpoints 12"
+
+ # Switch to inferior 1, add another checkpoint - so that there are
+ # three of them in inferior 1 - then switch back to inferior 3 and
+ # delete active checkpoint in inferior 1. Then, switch to
+ # inferior 1 and attempt to add another checkpoint. During
+ # development, a "Cannot access memory at address ..." message was
+ # seen. This was a bug - there were several problems, but one
+ # of them was that the checkpoint in question was an "active"
+ # checkpoint. The fix was to disallow this case.
+ gdb_test "inferior 1" "Switching to inferior 1.*?alarm \\(240\\);" \
+ "inferior 1 #3"
+
+ gdb_test "checkpoint" "\[Cc\]heckpoint 1\\.2: fork returned pid $::decimal.*" \
+ "second checkpoint in inferior 1"
+
+ gdb_test "inferior 3" "Switching to inferior 3.*?alarm \\(30\\);" \
+ "inferior 3 #4"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 1\\.0 A $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.1 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.2 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 2\\.1 $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.2 A $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ "\\* 3\\.0 A $proc_re at $::hex, file.*?$hangout_c.*?" \
+ " 3\\.2 $proc_re at $::hex, file.*?$hangout_c.*?"] \
+ "info checkpoints 13"
+
+ # Check that deleting active checkpoints in other (non-current)
+ # inferiors is disallowed.
+ gdb_test "delete checkpoint 1.0" \
+ "Please switch to another checkpoint before deleting the current one\[ \r\n\]+in inferior 1"
+
+ # But deleting non-active checkpoints, even in other inferiors
+ # should work.
+ gdb_test "delete checkpoint 1.1" \
+ "Killed process $::decimal"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ " 1\\.0 A $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.2 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 2\\.1 $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.2 A $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ "\\* 3\\.0 A $proc_re at $::hex, file.*?$hangout_c.*?" \
+ " 3\\.2 $proc_re at $::hex, file.*?$hangout_c.*?"] \
+ "info checkpoints 14"
+
+ gdb_test "inferior 1" "Switching to inferior 1.*?alarm \\(240\\);" \
+ "inferior 1 #4"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ "\\* 1\\.0 A $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.2 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 2\\.1 $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.2 A $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 3\\.0 A $proc_re at $::hex, file.*?$hangout_c.*?" \
+ " 3\\.2 $proc_re at $::hex, file.*?$hangout_c.*?"] \
+ "info checkpoints 15"
+
+ gdb_test "checkpoint" "\[Cc\]heckpoint 1\\.3: fork returned pid $::decimal.*" \
+ "third checkpoint in inferior 1"
+
+ gdb_test "info checkpoints" \
+ [multi_line \
+ "\\* 1\\.0 A $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.2 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 1\\.3 $proc_re at $::hex, file.*?$hello_c.*?" \
+ " 2\\.1 $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 2\\.2 A $proc_re at $::hex, file.*?$goodbye_c.*?" \
+ " 3\\.0 A $proc_re at $::hex, file.*?$hangout_c.*?" \
+ " 3\\.2 $proc_re at $::hex, file.*?$hangout_c.*?"] \
+ "info checkpoints 16"
+
+ gdb_test "x/i \$pc" "=> $::hex <main.*"
+
+ gdb_test "remove-inferior 3" \
+ "warning: Can not remove active inferior 3\."
+}