From 714bebff44076061d0a719c4eda2cfd213b7ac3d Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=C3=96mer=20Sinan=20A=C4=9Facan?= Date: Thu, 21 Jul 2016 08:07:41 +0000 Subject: Implement unboxed sum primitive type Summary: This patch implements primitive unboxed sum types, as described in https://ghc.haskell.org/trac/ghc/wiki/UnpackedSumTypes. Main changes are: - Add new syntax for unboxed sums types, terms and patterns. Hidden behind `-XUnboxedSums`. - Add unlifted unboxed sum type constructors and data constructors, extend type and pattern checkers and desugarer. - Add new RuntimeRep for unboxed sums. - Extend unarise pass to translate unboxed sums to unboxed tuples right before code generation. - Add `StgRubbishArg` to `StgArg`, and a new type `CmmArg` for better code generation when sum values are involved. - Add user manual section for unboxed sums. Some other changes: - Generalize `UbxTupleRep` to `MultiRep` and `UbxTupAlt` to `MultiValAlt` to be able to use those with both sums and tuples. - Don't use `tyConPrimRep` in `isVoidTy`: `tyConPrimRep` is really wrong, given an `Any` `TyCon`, there's no way to tell what its kind is, but `kindPrimRep` and in turn `tyConPrimRep` returns `PtrRep`. - Fix some bugs on the way: #12375. Not included in this patch: - Update Haddock for new the new unboxed sum syntax. - `TemplateHaskell` support is left as future work. For reviewers: - Front-end code is mostly trivial and adapted from unboxed tuple code for type checking, pattern checking, renaming, desugaring etc. - Main translation routines are in `RepType` and `UnariseStg`. Documentation in `UnariseStg` should be enough for understanding what's going on. Credits: - Johan Tibell wrote the initial front-end and interface file extensions. - Simon Peyton Jones reviewed this patch many times, wrote some code, and helped with debugging. Reviewers: bgamari, alanz, goldfire, RyanGlScott, simonpj, austin, simonmar, hvr, erikd Reviewed By: simonpj Subscribers: Iceland_jack, ggreif, ezyang, RyanGlScott, goldfire, thomie, mpickering Differential Revision: https://phabricator.haskell.org/D2259 --- includes/stg/MiscClosures.h | 1 + 1 file changed, 1 insertion(+) (limited to 'includes/stg/MiscClosures.h') diff --git a/includes/stg/MiscClosures.h b/includes/stg/MiscClosures.h index 0b8fbdc78a..3f5e403d49 100644 --- a/includes/stg/MiscClosures.h +++ b/includes/stg/MiscClosures.h @@ -105,6 +105,7 @@ RTS_ENTRY(stg_TVAR_CLEAN); RTS_ENTRY(stg_TVAR_DIRTY); RTS_ENTRY(stg_TSO); RTS_ENTRY(stg_STACK); +RTS_ENTRY(stg_RUBBISH_ENTRY); RTS_ENTRY(stg_ARR_WORDS); RTS_ENTRY(stg_MUT_ARR_WORDS); RTS_ENTRY(stg_MUT_ARR_PTRS_CLEAN); -- cgit v1.2.1