Re: [RFC/WIP PATCH 00/14] I/T sets

[Pedro Alves <pedro@codesourcery.com>]

On Monday 28 November 2011 15:38:53, Pedro Alves wrote:
> This series is also available at http://github.com/palves/gdb/tree/itsets-v1
> for convenience.

Whoops, I've just noticed that the series I posted is badly
broken due to a last minute change.  I've just pushed the commit
below there to fix it, and will fold it into the proper
place in for v2.

Sorry about that.

-- 
Pedro Alves

commit 0103de5e1e88bab2050a19abc51c92fd3d3898d0
Author: Pedro Alves <pedro@codesourcery.com>
Date:   Mon Nov 28 18:02:14 2011 +0000

    Allow calling itset_reference on a NULL itset.  We'll just return a
    NULL itset then.
    
    (top-gdb) bt
    #0  0x00000000006a4811 in itset_reference (itset=0x0) at ../../gdb/gdb/itset.c:1532
    #1  0x000000000052f87d in bpstat_stop_set (bs_head=0x1461ad0) at ../../gdb/gdb/breakpoint.c:4559
    #2  0x00000000005a09eb in handle_inferior_event (ecs=0x7fff568abc00) at ../../gdb/gdb/infrun.c:5183

diff --git a/gdb/itset.c b/gdb/itset.c
index 717d261..25e40b6 100644
--- a/gdb/itset.c
+++ b/gdb/itset.c
@@ -1529,7 +1529,8 @@ itset_contains_thread (struct itset *set, struct thread_info *thr)
 struct itset *
 itset_reference (struct itset *itset)
 {
-  ++itset->refc;
+  if (itset)
+    ++itset->refc;
   return itset;
 }