[cfe-dev] [PATCH] plugin problem on Windows

John Thompson john.thompson.jtsoftware at gmail.com
Sun Feb 13 18:58:25 PST 2011

I just realized this would need some more work, because I left in the
original code, such that on *nix boxes, the node would be double
registered.  Anyway, I wanted to open it up for discussion.

Making a big Clang DLL could be an option, but individual subsystem DLLs
probably would be a pain, because of all the import/export mixing.

On Fri, Feb 11, 2011 at 1:18 PM, John Thompson <
john.thompson.jtsoftware at gmail.com> wrote:

> With reference to the Bugzilla 9078 issue I posted, it appears the plug-in
> mechanism doesn't work on Windows.
> To recap, in loading a Windows plug-in DLL, the DLL will have it's own copy
> of the clang library code and data, such that the plug-in registry node list
> ends up in the DLL and not the Clang executable's data space, hence as-is,
> the plug-ins node doesn't end up in the registry instance in Clang.
> One way to fix it is to have the plug-ins provide a function hook for
> retrieving the node.  Since the address look-up function in Clang looks in
> all plug-ins loaded, that means it has to be a uniquely-named function.
> Therefore, perhaps basing it on the plug-in name is a way to go,
> I've enclosed a patch that modifies things to do this.  It expects the
> plug-in to export a function with a name like "Get_(plug-in name)_Node that
> returns the node instance.  See the modified PrintFunctionNames for an
> example of this.  Since the name for the PrintFunctionNames plug-in is
> "print-fns", I have the function lookup code replace '-' with '_' to get a
> legal C name.
> I've also modified the example.CMakeLists.txt file to build the example
> projects as part of the main build.
> I also needed some changes in the Registry class to add an AddNode function
> and expose some privates so the plug-in can get at its node.
> I've enclosed two patch files, one for the Clang side and one for the LLVM
> side (the Registry hack).
> Permission to check it in?  Otherwise, please suggest an alternate fix.
> -John
> --
> John Thompson
> John.Thompson.JTSoftware at gmail.com

John Thompson
John.Thompson.JTSoftware at gmail.com
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