#4213: LLVM: Add support for TNTC to LLVM compiler suite -------------------------------------+------------------------------------ Reporter: dterei | Owner: dterei Type: feature request | Status: new Priority: low | Milestone: 7.6.2 Component: Compiler (LLVM) | Version: 6.13 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: -------------------------------------+------------------------------------ Comment (by bgamari): Looking at the semantics of LLVM's prefix data concept, it seems like it doesn't map terribly well on to our use-case. Namely, the `prefix` attribute allows you to prepend arbitrary data to the beginning of the symbol's definition. While we would want LLVM to place the symbol's address after info table, naive use of prefix data would produce symbols pointing at the beginning of each function's info table. The documentation suggests that this is supposed to be worked around by beginning the prefix data with a trampoline to jump to the true beginning of the symbol. Given we already have a hack that works, I don't see any good reason to implement this hack. However, when used with another pending LLVM [feature](http://lists.cs.uiuc.edu/pipermail/llvmdev/2013-April/061511.html) allowing an offset to be applied to a symbol's address prefix data will become much more useful. I suggest we hold off on using LLVM's prefix data until this has been implemented. Unfortunately, it seems that the proposal is more than a year old with no activity but I can try to resuscitate it. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/4213#comment:12 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler