llvm dev - Aug 2014 - [LLVMdev] How to get dependencies (linked libraries) from a shared object (*.so)?

    

    Hello all,

    I need to get all dependencies of a .so file. I tried using
needed_library_begin/needed_library_end but they seem not to give the
dependencies but something else (if anything) I cannot quite figure out what. I
tried testing with Linux's ls. I ran "ldd ls" (ldd is
Linux-only)and got about six dependencies - as an example for one of them I can
remember libc. Then I tried this code:
    

        for (auto dep = ObjectFile->needed_library_begin(); dep !=
ObjectFile->needed_library_end(); ++dep)
        {
            llvm::StringRef Path;
            if (!dep->getPath(Path))
                ...

        }

    where ObjectFile represents the opened *.so - this pointer is guaranteed to
be correct because I read all exported symbols from it in the same function.
Further, I opened both ls and *.so with a text editor. They are, of course,
binaries, but their dependencies can actually be seen as text fragments inside.
So Clang should be able to read them in some manner, I just don't know what.
This is why I'll appreciate your help.
    As a final, hopefully helpful, reference, I'm applying the code I use to
successfully get the dependencies of a Windows DLL:

        if (auto COFFObjectFile =
llvm::dyn_cast<llvm::object::COFFObjectFile>(ObjectFile))
        {
            for (auto dep = COFFObjectFile->import_directory_begin(); dep !=
COFFObjectFile->import_directory_end(); ++dep)
            {
                llvm::StringRef Name;
                if (!dep->getName(Name) &&
(Name.endswith(".dll") || Name.endswith(".DLL")))
                    ...
            }
        }

        

    Regards,
    Dimitar Dobrev
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    Hello all,

    I need to get all dependencies of a .so file. I tried using
needed_library_begin/needed_library_end but they seem not to give the
dependencies but something else (if anything) I cannot quite figure out what. I
tried testing with Linux's ls. I ran "ldd ls" (ldd is
Linux-only)and got about six dependencies - as an example for one of them I can
remember libc. Then I tried this code:
    

        for (auto dep = ObjectFile->needed_library_begin(); dep !=
ObjectFile->needed_library_end(); ++dep)
        {
            llvm::StringRef Path;
            if (!dep->getPath(Path))
                ...

        }

    where ObjectFile represents the opened *.so - this pointer is guaranteed to
be correct because I read all exported symbols from it in the same function.
Further, I opened both ls and *.so with a text editor. They are, of course,
binaries, but their dependencies can actually be seen as text fragments inside.
So Clang should be able to read them in some manner, I just don't know what.
This is why I'll appreciate your help.
    As a final, hopefully helpful, reference, I'm applying the code I use to
successfully get the dependencies of a Windows DLL:

        if (auto COFFObjectFile =
llvm::dyn_cast<llvm::object::COFFObjectFile>(ObjectFile))
        {
            for (auto dep = COFFObjectFile->import_directory_begin(); dep !=
COFFObjectFile->import_directory_end(); ++dep)
            {
                llvm::StringRef Name;
                if (!dep->getName(Name) &&
(Name.endswith(".dll") || Name.endswith(".DLL")))
                    ...
            }
        }

        

    Regards,
    Dimitar Dobrev
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