Retrieves Bitcode from Mach-O binaries
Bitcode stores as an xar archive inside of a Mach-O binary.
This tool extracts the archive and puts it near the binary, so it can be easily discovered using xar
and llvm-dis
Clone the repo and run make
, built binary lays inside of build
directory
$ git clone [email protected]:AlexDenisov/bitcode_retriever.git
$ cd bitcode_retriever
$ make
Note: currently is does not work with static libraries, there is an opened issue #1, if you need this feature please a comment there, it will bump prioity of this project at my personal todo-list.
To use bitcode_retriever
simple feed him your binary and it'll produce archive with bitcode.
It accepts both fat and non-fat binaries. For fat binaries it produces separate archive for each slice, e.g.:
$ bitcode_retriever fat_app
i386.xar
x86_64.xar
arm64.xar
for non-fat binaries it produces just one archive with the bitcode:
$ bitcode_retriever non_fat_app
i386.xar
To skip the xar archive and obtain the bitcode immediately, pass the -extract
argument.
$ bitcode_retriever -extract fat_app
i386.1.bc
i386.2.bc
x86_64.1.bc
x86_64.2.bc
The project provides a sample binaries, you can play a bit with them:
$ make subject
$ cd build
$ ./bitcode_retriever i386.o
# or
$ ./bitcode_retriever fat.o
The xar archive stores set of files with bitcode:
$ xar -xf i386.o
$ ls
i386.o 1 2
You can dump LLVM IR from each file (1
, 2
) using llvm-dis
$ llvm-dis 1
$ llvm-dis 2
$ ls
1 2 1.ll 2.ll
If you have any problems or found some bug - feel free to open an issue and/or send a pull request