From: Pedro Alves <palves@redhat.com>
Date: Fri, 2 Mar 2012 19:26:10 +0000 (+0000)
Subject: 2012-03-02  Tom Tromey  <tromey@redhat.com>
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=f59f708a4b12a347cb003c750b96336822481900;p=binutils-gdb.git

2012-03-02  Tom Tromey  <tromey@redhat.com>
	    Pedro Alves  <palves@redhat.com>

	PR breakpoints/13776:
	* breakpoint.c (breakpoint_init_inferior): Delete step-resume
	breakpoints.
	(delete_longjmp_breakpoint_at_next_stop): New.
	* breakpoint.h (delete_longjmp_breakpoint_at_next_stop): Declare.
	* target.c (generic_mourn_inferior): Call mark_breakpoints_out
	before deleting the inferior.  Add comments.
	* thread.c (clear_thread_inferior_resources): Don't delete lonjmp
	breakpoints immediately, but only on next stop.  Move that code
	next to where we mark other breakpoints for deletion.
---

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 2ef95916d29..41d0277a53f 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,17 @@
+2012-03-02  Tom Tromey  <tromey@redhat.com>
+	    Pedro Alves  <palves@redhat.com>
+
+	PR breakpoints/13776:
+	* breakpoint.c (breakpoint_init_inferior): Delete step-resume
+	breakpoints.
+	(delete_longjmp_breakpoint_at_next_stop): New.
+	* breakpoint.h (delete_longjmp_breakpoint_at_next_stop): Declare.
+	* target.c (generic_mourn_inferior): Call mark_breakpoints_out
+	before deleting the inferior.  Add comments.
+	* thread.c (clear_thread_inferior_resources): Don't delete lonjmp
+	breakpoints immediately, but only on next stop.  Move that code
+	next to where we mark other breakpoints for deletion.
+
 2012-03-02  Joel Brobecker  <brobecker@adacore.com>
 
 	* mips-linux-nat.c (mips_linux_read_description): Add missing i18n
diff --git a/gdb/breakpoint.c b/gdb/breakpoint.c
index ce35da29edc..3decd920527 100644
--- a/gdb/breakpoint.c
+++ b/gdb/breakpoint.c
@@ -3341,6 +3341,10 @@ breakpoint_init_inferior (enum inf_context context)
 	   (gdb) tar rem :9999     # remote Windows gdbserver.
 	*/
 
+      case bp_step_resume:
+
+	/* Also remove step-resume breakpoints.  */
+
 	delete_breakpoint (b);
 	break;
 
@@ -6624,6 +6628,19 @@ delete_longjmp_breakpoint (int thread)
       }
 }
 
+void
+delete_longjmp_breakpoint_at_next_stop (int thread)
+{
+  struct breakpoint *b, *b_tmp;
+
+  ALL_BREAKPOINTS_SAFE (b, b_tmp)
+    if (b->type == bp_longjmp || b->type == bp_exception)
+      {
+	if (b->thread == thread)
+	  b->disposition = disp_del_at_next_stop;
+      }
+}
+
 void
 enable_overlay_breakpoints (void)
 {
diff --git a/gdb/breakpoint.h b/gdb/breakpoint.h
index 7e8c597c245..5b5172ee6b4 100644
--- a/gdb/breakpoint.h
+++ b/gdb/breakpoint.h
@@ -1254,6 +1254,9 @@ extern void set_longjmp_breakpoint (struct thread_info *tp,
 				    struct frame_id frame);
 extern void delete_longjmp_breakpoint (int thread);
 
+/* Mark all longjmp breakpoints from THREAD for later deletion.  */
+extern void delete_longjmp_breakpoint_at_next_stop (int thread);
+
 extern void enable_overlay_breakpoints (void);
 extern void disable_overlay_breakpoints (void);
 
diff --git a/gdb/target.c b/gdb/target.c
index 1f408f6f575..d29d37a1f0d 100644
--- a/gdb/target.c
+++ b/gdb/target.c
@@ -3583,13 +3583,22 @@ generic_mourn_inferior (void)
   ptid = inferior_ptid;
   inferior_ptid = null_ptid;
 
+  /* Mark breakpoints uninserted in case something tries to delete a
+     breakpoint while we delete the inferior's threads (which would
+     fail, since the inferior is long gone).  */
+  mark_breakpoints_out ();
+
   if (!ptid_equal (ptid, null_ptid))
     {
       int pid = ptid_get_pid (ptid);
       exit_inferior (pid);
     }
 
+  /* Note this wipes step-resume breakpoints, so needs to be done
+     after exit_inferior, which ends up referencing the step-resume
+     breakpoints through clear_thread_inferior_resources.  */
   breakpoint_init_inferior (inf_exited);
+
   registers_changed ();
 
   reopen_exec_file ();
diff --git a/gdb/thread.c b/gdb/thread.c
index 22d8b236b95..97f283cc6be 100644
--- a/gdb/thread.c
+++ b/gdb/thread.c
@@ -113,12 +113,12 @@ clear_thread_inferior_resources (struct thread_info *tp)
       tp->control.exception_resume_breakpoint = NULL;
     }
 
+  delete_longjmp_breakpoint_at_next_stop (tp->num);
+
   bpstat_clear (&tp->control.stop_bpstat);
 
   do_all_intermediate_continuations_thread (tp, 1);
   do_all_continuations_thread (tp, 1);
-
-  delete_longjmp_breakpoint (tp->num);
 }
 
 static void