[cfe-commits] [llvm-commits] [Patch] Move TargetData from Target to Support/VMCore

Villmow, Micah Micah.Villmow at amd.com
Thu Oct 4 15:51:13 PDT 2012

I'm curious how this could work.

I have two classes.
TargetData and DataLayout.

I want to point all uses of TargetData at DataLayout.

typedef won't work not just because of forward declarations, but also because of static functions.

So, I could define DataLayout as a subclass of TargetData, but once I want to move to DataLayout, how do I define TargetData in a way that won't require changes to many many locations.


From: Kim Gräsman [mailto:kim.grasman at gmail.com]
Sent: Thursday, October 04, 2012 1:33 PM
To: Villmow, Micah
Cc: Chris Lattner; Evan Cheng; llvm-commits at cs.uiuc.edu LLVM; cfe-commits at cs.uiuc.edu cfe; Nadav Rotem
Subject: Re: [cfe-commits] [llvm-commits] [Patch] Move TargetData from Target to Support/VMCore

HI Micah,

On Thursday, October 4, 2012, Villmow, Micah wrote:
Chris, the problem with steps #2/#3 is that plenty of clients have forward declarations of TargetData and the typedef won't work in this case, so I need to update the clients anyways.

One trick I've used as an alternative to typedefs is to just derive from the old class, e.g.

  class NewName : public TargetData {};

This is forward-declarable just as well as TargetData itself.

- Kim
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