[lldb-dev] Load object file on the fly

[Greg Clayton via lldb-dev]

> On Feb 28, 2017, at 4:19 AM, Carlo Kok via lldb-dev <lldb-dev at lists.llvm.org> wrote:
> 
> As far as I can tell from reading the source LLDB has facilities to load a "jitted" clang fragment as an object file, load it into the target process "run" it and unload it. Could this process be reused externally? Say from the SB or lower level apis?
> 
> What I want to accomplish is allow better expression evaluation for my own languages by compling a piece of code to an object file (coff/elf, whatever), passing all locals/args as arguments to this and getting the evaluated result out of it. Is something like this possible?

Yes. In SBProcess you can load a shared library and unload it:

  //------------------------------------------------------------------
  /// Load a shared library into this process.
  ///
  /// @param[in] remote_image_spec
  ///     The path for the shared library on the target what you want
  ///     to load.
  ///
  /// @param[out] error
  ///     An error object that gets filled in with any errors that
  ///     might occur when trying to load the shared library.
  ///
  /// @return
  ///     A token that represents the shared library that can be
  ///     later used to unload the shared library. A value of
  ///     LLDB_INVALID_IMAGE_TOKEN will be returned if the shared
  ///     library can't be opened.
  //------------------------------------------------------------------
  uint32_t LoadImage(lldb::SBFileSpec &remote_image_spec, lldb::SBError &error);

  //------------------------------------------------------------------
  /// Load a shared library into this process.
  ///
  /// @param[in] local_image_spec
  ///     The file spec that points to the shared library that you
  ///     want to load if the library is located on the host. The
  ///     library will be copied over to the location specified by
  ///     remote_image_spec or into the current working directory with
  ///     the same filename if the remote_image_spec isn't specified.
  ///
  /// @param[in] remote_image_spec
  ///     If local_image_spec is specified then the location where the
  ///     library should be copied over from the host. If
  ///     local_image_spec isn't specified, then the path for the
  ///     shared library on the target what you want to load.
  ///
  /// @param[out] error
  ///     An error object that gets filled in with any errors that
  ///     might occur when trying to load the shared library.
  ///
  /// @return
  ///     A token that represents the shared library that can be
  ///     later used to unload the shared library. A value of
  ///     LLDB_INVALID_IMAGE_TOKEN will be returned if the shared
  ///     library can't be opened.
  //------------------------------------------------------------------
  uint32_t LoadImage(const lldb::SBFileSpec &local_image_spec,
                     const lldb::SBFileSpec &remote_image_spec,
                     lldb::SBError &error);

  lldb::SBError UnloadImage(uint32_t image_token);


> -- 
> Carlo Kok
> RemObjects Software
> _______________________________________________
> lldb-dev mailing list
> lldb-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/lldb-dev/attachments/20170228/a52f3d11/attachment.html>