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Otool

Usage 

Usage: otool [-arch arch_type] [-fahlLDtdorSTMRIHGvVcXmqQjCP] [-mcpu=arg] [--version] <object file> ...

Flags

  • -f: print the fat headers
  • -a: print the archive header
  • -h: print the mach header
  • -l: print the load commands
  • -L: print shared libraries used
  • -D: print shared library id name
  • -t: print the text section (disassemble with -v)
  • -p<routine name>: start dissassemble from routine name
  • -s<segname><sectname>: print contents of section
  • -d: print the data section
  • -o: print the Objective-C segment
  • -r: print the relocation entries
  • -S: print the table of contents of a library
  • -T: print the table of contents of a dynamic shared library
  • -M: print the module table of a dynamic shared library
  • -R: print the reference table of a dynamic shared library
  • -I: print the indirect symbol table
  • -H: print the two-level hints table
  • -G: print the data in code table
  • -v: print verbosely (symbolically) when possible
  • -V: print disassembled operands symbolically
  • -c: print argument strings of a core file
  • -X: print no leading addresses or headers
  • -m: don't use archive(member) syntax
  • -B: force Thumb disassembly (ARM objects only)
  • -q: use llvm's disassembler (the default)
  • -Q: use otool(1)'s disassembler
  • -mcpu=arg: use `arg' as the cpu for disassembly
  • -j: print opcode bytes
  • -P: print the info plist section as strings
  • -C: print linker optimization hints
  • --version: print the version

Useful examples

otool -L libsomething.dylib
특정 라이브러리가 사용하는 공용 라이브러리 목록을 전부 출력한다. ldd와 유사하다.
otool -l ams
LC_RPATH등의 헤더 정보를 출력한다.

How to check the lIbrary architecture

라이브러리의 아키텍쳐를 확인하는 방법은 아래와 같다. 

$ otool -hv libtest.a

참고로, readelf, lipo, objdump로도 각각 확인할 수 있다. 

$ readelf -h <archive>.a | grep 'Class\|File\|Machine'
$ lipo -info libExample.a
$ objdump -a file.a | grep 'file format'

See also