Is there a tool/script which can help me iterate over (or just count) all the selectors in a objective-c binary. I want to statically analyze objective c binaries and get that metric. I tried otool -tV but all it dumps is hex-data which I'm unable to parse. Some people suggest using lldb but I'm unsure how to do that.
You can print all of the selectors like this:
$ objdump -section=__objc_selrefs -macho /Applications/Xcode.app/Contents/Frameworks/IBFoundation.framework/IBFoundation
/Applications/Xcode.app/Contents/Frameworks/IBFoundation.framework/IBFoundation:
Contents of (__DATA,__objc_selrefs) section
000000000016a808 __TEXT:__objc_methname:init
000000000016a810 __TEXT:__objc_methname:copy
000000000016a818 __TEXT:__objc_methname:array
000000000016a820 __TEXT:__objc_methname:dictionary
000000000016a828 __TEXT:__objc_methname:addObject:
000000000016a830 __TEXT:__objc_methname:setObject:forKey:
000000000016a838 __TEXT:__objc_methname:appendString:
000000000016a840 __TEXT:__objc_methname:allKeys
...
If you want to count them, grep out the two header lines and pipe the rest into wc:
$ objdump -section=__objc_selrefs -macho /Applications/Xcode.app/Contents/Frameworks/IBFoundation.framework/IBFoundation | grep ^'[0-9a-f]' | wc -l
1668