[LLVMdev] [PATCH] Symbol offsets

[Ben Gamari]

Somehow this cover letter was dropped from my symbol offsets patch set:

  1. http://lists.cs.uiuc.edu/pipermail/llvmdev/2014-May/073200.html
  2. http://lists.cs.uiuc.edu/pipermail/llvmdev/2014-May/073201.html


Original message
-----------------

About a year ago a proposal suggesting symbol offsets was brought to
this list[1]. This proposal goes hand-in-hand with the prefix data
proposal[2] which has now been implemented and I believe both of these
arose in part due to GHC's requirement to place its info tables before
symbol definitions[3]. Unfortunately, the current implementation of
prefix data isn't terribly useful to GHC without symbol offsets[4,5]

This weekend I implemented option (2) in the original proposal, then
eventually implemented option (1) on top of this. Here is the
result. Note that this can also be found on Github[6] for those who
prefer this.

A review would be greatly appreciated. One known deficiency of this set
is the lack of tests. Unfortunately, due to the use of temporary symbols
it's not clear to me how this feature can be reliably tested. Ideas
are welcome.

Cheers,

- Ben


[1] http://lists.cs.uiuc.edu/pipermail/llvmdev/2013-April/061511.html
[2] http://lists.cs.uiuc.edu/pipermail/llvmdev/2013-July/063909.html
[3] http://lists.cs.uiuc.edu/pipermail/llvmdev/2012-February/047514.html
[4] http://www.haskell.org/pipermail/ghc-devs/2013-September/002565.html
[5] https://ghc.haskell.org/trac/ghc/ticket/4213#comment:12
[6] https://github.com/bgamari/llvm/compare/symbol-offset

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