[LLVMdev] [lld] Overloaded Layout references

[Rui Ueyama]

I'm not sure if I understand the suggestion correctly, so let me double
check.

1. You are thinking that layout-after should affect only on layouts, and
garbage collector should ignore them.
2. Instead of layout-after, you suggested adding some other reference, so
that all atoms from the same section will be handled as a group by the
garbage collector.
3. By doing 1 and 2, we can make the LayoutPass simpler.

Are the above points correct?

On Tue, Jan 27, 2015 at 3:58 PM, Shankar Easwaran <shankare at codeaurora.org>
wrote:

> Hi,
>
> I think we are overloading the Layout references for garbage collection.
>
> If you are creating a reference (kindLayoutAfter) from A to B, that may
> not mean that you cannot garbage collect B for the end user.
>
> My thought on Layout references was that it only guarantees that atoms
> appear in Layout reference order.
>
> Why are we overloading this for Garbage collection (aside from saving
> space/code) ?
>
> We should create kindLive (or) some better name IMO for Garbage
> collection. With this the complex LayoutPass can be optional and would be
> meant only for users that need the LayoutReferences to specify layout of
> the image.
>
> We could come up with a simpler pass for Layout(to sort atoms by file
> ordinal).
>
> What do you think ?
>
> Shankar Easwaran
>
> --
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted
> by the Linux Foundation
>
>
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