where is shared libraries in iphone device?

I'm looking for shared libraries in my iPhone.
in gdb, I can get locations...

(gdb) info shared
...
7 UIKit F 0x31acc000 dyld Y Y /System/Library/Frameworks/UIKit.framework/UIKit at 0x31acc000 (offset 0x0)
...

but there is no "UIKit" file in that directory in my iPhone device

Are they encrypted or compressed in some other location?
Where is it?


Thanks...