From 72f31aea9e6c158f442239abedaf351465ebcb41 Mon Sep 17 00:00:00 2001 From: Pedro Alves Date: Wed, 6 Mar 2019 18:29:17 +0000 Subject: [PATCH] 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 * 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. --- gdb/ChangeLog | 8 ++++++++ gdb/linux-fork.c | 44 ++++++++++++++++++++++++++++---------------- gdb/linux-fork.h | 2 +- 3 files changed, 37 insertions(+), 17 deletions(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 8866756..3aaa5ed 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,11 @@ +2019-03-06 Pedro Alves + + * 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 * f-exp.y (direct_abs_decl): Handle TYPE*SIZE type names. diff --git a/gdb/linux-fork.c b/gdb/linux-fork.c index b1b390c..a748dea 100644 --- a/gdb/linux-fork.c +++ b/gdb/linux-fork.c @@ -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; } diff --git a/gdb/linux-fork.h b/gdb/linux-fork.h index e6f1304..f918bcb 100644 --- a/gdb/linux-fork.h +++ b/gdb/linux-fork.h @@ -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); -- 2.7.4