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<base href="https://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - po sometimes prints blank instead of object"
href="https://llvm.org/bugs/show_bug.cgi?id=31308">31308</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>po sometimes prints blank instead of object
</td>
</tr>
<tr>
<th>Product</th>
<td>lldb
</td>
</tr>
<tr>
<th>Version</th>
<td>3.6
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Macintosh
</td>
</tr>
<tr>
<th>OS</th>
<td>MacOS X
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>lldb-dev@lists.llvm.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>mth@xmission.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>My debug environment is Xcode 8.1 stopped at a breakpoint while debugging an
iOS application (usually 9.3.5 or 10.1) written in Objective C. Sometimes when
I use po to print an object, all it prints is a blank line. Printing with
different syntax will sometimes make it work. In this particular example the
object was a property of the argument to a simple method:
- (void)handleDataModelChange: (NSNotification *)nt
{
NSSet *updatedObjects = [[nt userInfo] objectForKey: NSUpdatedObjectsKey];
...
}
The breakpoint was set near the end of the method. Here is the output of some
po commands I tried. The last po command prints the object as it should be
printed by the first two po commands. Instead they just give blank lines.
(lldb) po nt.object
(lldb) po [nt object]
(lldb) po [nt.object class]
NSManagedObjectContext
(lldb) po (NSManagedObject *)nt.object
<NSManagedObjectContext: 0x14576d20>: defaultMainQueueContext
[lldb --version prints lldb-360.1.65]</pre>
</div>
</p>
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