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

Thu Oct 4 15:32:47 PDT 2012

Here is the second step of #1, this does the datalayout renaming. I've also renamed TargetAlignElem and TargetTypeEnum as they are not 'Target' objects but Layout objects.

The next step will be to remap TargetData to DataLayout.

From: Chandler Carruth [mailto:chandlerc at google.com]
Sent: Thursday, October 04, 2012 11:46 AM
To: Villmow, Micah
Cc: Chris Lattner; llvm-commits at cs.uiuc.edu LLVM; cfe-commits at cs.uiuc.edu cfe
Subject: Re: [llvm-commits] [cfe-commits] [Patch] Move TargetData from Target to Support/VMCore

On Thu, Oct 4, 2012 at 11:40 AM, Villmow, Micah <Micah.Villmow at amd.com<mailto:Micah.Villmow at amd.com>> 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.

What about this sequence:
1) Introduce include/llvm/DataLayout.h and lib/VMCore/DataLayout.cpp(which is a functionally equivalent copy of TargetData).

First just copy the files over without any edits, then in a second commit rename stuff to DataLayout. That way we can see the rename. It's all dead code until #2

2) Update each client to point to DataLayout.

This step needs to be a single commit.

Otherwise, this seems a reasonable way to cope with forward declarations. They make renaming really hard. =/

3) Remove TargetData.

> -----Original Message-----
> From: Chris Lattner [mailto:clattner at apple.com<mailto:clattner at apple.com>]
> Sent: Tuesday, October 02, 2012 10:02 PM
> To: Villmow, Micah
> Cc: Evan Cheng; Hal Finkel; llvm-commits at cs.uiuc.edu<mailto:llvm-commits at cs.uiuc.edu> LLVM; Nadav Rotem;
> cfe-commits at cs.uiuc.edu<mailto:cfe-commits at cs.uiuc.edu> cfe
> Subject: Re: [cfe-commits] [llvm-commits] [Patch] Move TargetData from
> Target to Support/VMCore
>
>
> On Oct 2, 2012, at 5:57 PM, "Villmow, Micah" <Micah.Villmow at amd.com<mailto:Micah.Villmow at amd.com>>
> wrote:
>
> > Chris,
> > Here is an attachd patch. It is quite large because the number of
> places within the LLVM tree where TargetData is used.
> >
> > My only question is did you want a new subdirectory, VMCore, created
> in the include directory?
>
> My mistake, sorry for being unclear.  More specifically, please do this
> as a series of independent patches:
>
> 1. Add a typedef for TargetData -> DataLayout in TargetData.h 2. Rename
> the TargetData class & implementation (but not the file or clients) to
> DataLayout.  Switch the typedef to DataLayout -> TargetData.
> 3. Rename uses of the "TargetData" typedef to be DataLayout.  Remove the
> typedef.
> 4. Move lib/Target/TargetData.cpp to lib/VMCore/DataLayout.cpp 5. Move
> the contents the header from include/llvm/Target/TargetData.h to
> include/llvm/DataLayout.h and keep TargetData.h as just a single
> #include of the new header.
> 6. Update all the clients to switch from TargetData.h to DataLayout.h in
> the various projects (clang/llvm/dragonegg/lldb) that include it.  When
> they're all converted, remove the forwarding header.
>
> The idea of each of these steps is that they become "obvious" and really
> simple to review.  Thanks for tackling this Micah!
>
> -Chris
>
> >
> > Micah
> >
> >> -----Original Message-----
> >> From: Chris Lattner [mailto:clattner at apple.com<mailto:clattner at apple.com>]
> >> Sent: Tuesday, October 02, 2012 9:26 AM
> >> To: Villmow, Micah
> >> Cc: Evan Cheng; Hal Finkel; llvm-commits at cs.uiuc.edu<mailto:llvm-commits at cs.uiuc.edu> LLVM; Nadav
> >> Rotem; cfe-commits at cs.uiuc.edu<mailto:cfe-commits at cs.uiuc.edu> cfe
> >> Subject: Re: [cfe-commits] [llvm-commits] [Patch] Move TargetData
> >> from Target to Support/VMCore
> >>
> >> Yes.  How about just llvm/VMCore/DataLayout.h?
> >>
> >> -Chris
> >>
> >> On Oct 2, 2012, at 8:55 AM, "Villmow, Micah" <Micah.Villmow at amd.com<mailto:Micah.Villmow at amd.com>>
> >> wrote:
> >>
> >>> Chris,
> >>> So if I renamed it to something like DataLayoutParser, that would be
> >> acceptable to move the functionality into core?
> >>>
> >>> Micah
> >>>
> >>>> -----Original Message-----
> >>>> From: Chris Lattner [mailto:clattner at apple.com<mailto:clattner at apple.com>]
> >>>> Sent: Sunday, September 30, 2012 9:03 AM
> >>>> To: Evan Cheng
> >>>> Cc: Hal Finkel; Villmow, Micah; llvm-commits at cs.uiuc.edu<mailto:llvm-commits at cs.uiuc.edu> LLVM;
> >>>> Nadav Rotem; cfe-commits at cs.uiuc.edu<mailto:cfe-commits at cs.uiuc.edu> cfe
> >>>> Subject: Re: [cfe-commits] [llvm-commits] [Patch] Move TargetData
> >>>> from Target to Support/VMCore
> >>>>
> >>>> On Sep 26, 2012, at 9:18 PM, Evan Cheng <evan.cheng at apple.com<mailto:evan.cheng at apple.com>>
> wrote:
> >>>>> On Sep 26, 2012, at 11:07 AM, Hal Finkel <hfinkel at anl.gov<mailto:hfinkel at anl.gov>> wrote:
> >>>>>
> >>>>>> On Tue, 25 Sep 2012 16:16:22 -0700 Evan Cheng
> >>>>>> <evan.cheng at apple.com<mailto:evan.cheng at apple.com>> wrote:
> >>>>>>
> >>>>>>> Sorry, I understand why you are requesting this but I thinking
> >>>>>>> moving TargetData to support is conceptually dirty.
> >>>>>>
> >>>>>> Can you please explain this? I think that the opposite is true:
> >>>>>> Having TargetData in Target is conceptually dirty. TargetData
> >>>>>> represents 'target information that is available to frontends and
> >>>>>> IR-level passes without linking to the target descriptions'.
> >>>>>
> >>>>> Agreed.
> >>>>>
> >>>>>> As a result, I feel
> >>>>>> that TargetData does not belong with the target-description
> >>>>>> infrastructure, and so it should be moved out of Target so that
> >>>>>> everyone can use it.
> >>>>>
> >>>>> I agree it should be moved out but at least it's target related.
> >>>> Polluting Support / VMCore with it is just worse. They have nothing
> >>>> to do with target data conceptually. This is all a matter of taste.
> >>>> I'll let Chris make the decision.
> >>>>
> >>>> I agree with this patch in principle: TargetData should be moved to
> >>>> VMCore.  However, the class should also be renamed.
> >>>>
> >>>> -Chris
> >>>
> >>>
> >
> > <move_TargetData_to_DataLayout.txt>
>

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