[swift-dev] Adding a field to StrongRefCount class

Jiho Choi jray319 at gmail.com
Wed Sep 27 12:24:40 CDT 2017

Thanks for the explanation.  I modified those two locations you mentioned
but the build failed during tests.  I've been browsing the source code to
figure out other dependences but didn't succeed yet.  Could you please give
me some pointers on where to look at?


On Tue, Sep 26, 2017 at 12:22 AM John McCall <rjmccall at apple.com> wrote:

> > On Sep 26, 2017, at 12:56 AM, Jiho Choi via swift-dev <
> swift-dev at swift.org> wrote:
> > I want to add a field to StrongRefCount class for some experiment, but
> the build fails while building self-hosted 'swift-build'.  I am using the
> version 3.1.1.
> >
> > Does the shape of StrongRefCount class have any implicit dependence on
> other parts of the runtime?
> The size of the heap header is hard-coded in the compiler.  There's a
> function getHeapHeaderSize in StructLayout.cpp, but you'll also need to
> update the definition of RefCountedStructTy in IRGenModule.cpp, and almost
> certainly some other places.  It's not something that's been carefully
> abstracted because it's something we don't really expect to change.
> John.
> > What is the correct way to add a field to this class?
> >
> > Thanks,
> > Jiho
> > _______________________________________________
> > swift-dev mailing list
> > swift-dev at swift.org
> > https://lists.swift.org/mailman/listinfo/swift-dev
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.swift.org/pipermail/swift-dev/attachments/20170927/c367371d/attachment.html>

More information about the swift-dev mailing list