https://llvm.org/bugs/show_bug.cgi?id=31308
Bug ID: 31308
Summary: po sometimes prints blank instead of object
Product: lldb
Version: 3.6
Hardware: Macintosh
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: lldb-...@lists.llvm.org
Reporter: m...@xmission.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
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]
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