\section[SimplMonad]{The simplifier Monad}
\begin{code}
-{-# OPTIONS -w #-}
--- The above warning supression flag is a temporary kludge.
--- While working on this module you are encouraged to remove it and fix
--- any warnings in the module. See
--- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
--- for details
-
module SimplEnv (
InId, InBind, InExpr, InAlt, InArg, InType, InBndr,
OutId, OutTyVar, OutBind, OutExpr, OutAlt, OutArg, OutType, OutBndr,
#include "HsVersions.h"
-import SimplMonad
+import SimplMonad
import IdInfo
import CoreSyn
-import Rules
import CoreUtils
import CostCentre
import Var
import Coercion
import BasicTypes
import DynFlags
-import Util
+import MonadUtils
import Outputable
+import FastString
import Data.List
\end{code}
pprSimplEnv :: SimplEnv -> SDoc
-- Used for debugging; selective
pprSimplEnv env
- = vcat [ptext SLIT("TvSubst:") <+> ppr (seTvSubst env),
- ptext SLIT("IdSubst:") <+> ppr (seIdSubst env) ]
+ = vcat [ptext (sLit "TvSubst:") <+> ppr (seTvSubst env),
+ ptext (sLit "IdSubst:") <+> ppr (seIdSubst env) ]
type SimplIdSubst = IdEnv SimplSR -- IdId |--> OutExpr
-- See Note [Extending the Subst] in CoreSubst
InExpr
instance Outputable SimplSR where
- ppr (DoneEx e) = ptext SLIT("DoneEx") <+> ppr e
- ppr (DoneId v) = ptext SLIT("DoneId") <+> ppr v
- ppr (ContEx tv id e) = vcat [ptext SLIT("ContEx") <+> ppr e {-,
+ ppr (DoneEx e) = ptext (sLit "DoneEx") <+> ppr e
+ ppr (DoneId v) = ptext (sLit "DoneId") <+> ppr v
+ ppr (ContEx _tv _id e) = vcat [ptext (sLit "ContEx") <+> ppr e {-,
ppr (filter_env tv), ppr (filter_env id) -}]
-- where
-- fvs = exprFreeVars e
ppr (Floats binds ff) = ppr ff $$ ppr (fromOL binds)
instance Outputable FloatFlag where
- ppr FltLifted = ptext SLIT("FltLifted")
- ppr FltOkSpec = ptext SLIT("FltOkSpec")
- ppr FltCareful = ptext SLIT("FltCareful")
+ ppr FltLifted = ptext (sLit "FltLifted")
+ ppr FltOkSpec = ptext (sLit "FltOkSpec")
+ ppr FltCareful = ptext (sLit "FltCareful")
andFF :: FloatFlag -> FloatFlag -> FloatFlag
andFF FltCareful _ = FltCareful
andFF FltOkSpec FltCareful = FltCareful
-andFF FltOkSpec flt = FltOkSpec
+andFF FltOkSpec _ = FltOkSpec
andFF FltLifted flt = flt
classifyFF :: CoreBind -> FloatFlag
= env { seFloats = seFloats env `addFlts` unitFloat (NonRec id rhs),
seInScope = extendInScopeSet (seInScope env) id }
-extendFloats :: SimplEnv -> [OutBind] -> SimplEnv
+extendFloats :: SimplEnv -> OutBind -> SimplEnv
-- Add these bindings to the floats, and extend the in-scope env too
-extendFloats env binds
- = env { seFloats = seFloats env `addFlts` new_floats,
+extendFloats env bind
+ = env { seFloats = seFloats env `addFlts` unitFloat bind,
seInScope = extendInScopeSetList (seInScope env) bndrs }
where
- bndrs = bindersOfBinds binds
- new_floats = Floats (toOL binds)
- (foldr (andFF . classifyFF) FltLifted binds)
+ bndrs = bindersOf bind
addFloats :: SimplEnv -> SimplEnv -> SimplEnv
-- Add the floats for env2 to env1;
-- This is all very specific to the way recursive bindings are
-- handled; see Simplify.simplRecBind
addRecFloats env1 env2@(SimplEnv {seFloats = Floats bs ff})
- = ASSERT2( case ff of { FltLifted -> True; other -> False }, ppr (fromOL bs) )
+ = ASSERT2( case ff of { FltLifted -> True; _ -> False }, ppr (fromOL bs) )
env2 {seFloats = seFloats env1 `addFlts` unitFloat (Rec (flattenBinds (fromOL bs)))}
wrapFloats :: SimplEnv -> OutExpr -> OutExpr
-- Get the most up-to-date thing from the in-scope set
-- Even though it isn't in the substitution, it may be in
-- the in-scope set with better IdInfo
+refine :: InScopeSet -> Var -> Var
refine in_scope v = case lookupInScope in_scope v of
Just v' -> v'
Nothing -> WARN( True, ppr v ) v -- This is an error!
lookupRecBndr (SimplEnv { seInScope = in_scope, seIdSubst = ids }) v
= case lookupVarEnv ids v of
Just (DoneId v) -> v
- Just res -> pprPanic "lookupRecBndr" (ppr v)
- Nothing -> refine in_scope v
+ Just _ -> pprPanic "lookupRecBndr" (ppr v)
+ Nothing -> refine in_scope v
\end{code}
\begin{code}
simplBinders, simplLamBndrs
:: SimplEnv -> [InBndr] -> SimplM (SimplEnv, [OutBndr])
-simplBinders env bndrs = mapAccumLSmpl simplBinder env bndrs
-simplLamBndrs env bndrs = mapAccumLSmpl simplLamBndr env bndrs
+simplBinders env bndrs = mapAccumLM simplBinder env bndrs
+simplLamBndrs env bndrs = mapAccumLM simplLamBndr env bndrs
-------------
simplBinder :: SimplEnv -> InBndr -> SimplM (SimplEnv, OutBndr)
-------------
simplLamBndr :: SimplEnv -> Var -> SimplM (SimplEnv, Var)
-- Used for lambda binders. These sometimes have unfoldings added by
--- the worker/wrapper pass that must be preserved, becuase they can't
+-- the worker/wrapper pass that must be preserved, because they can't
-- be reconstructed from context. For example:
-- f x = case x of (a,b) -> fw a b x
-- fw a b x{=(a,b)} = ...
-- The "{=(a,b)}" is an unfolding we can't reconstruct otherwise.
simplLamBndr env bndr
- | not (isId bndr && hasSomeUnfolding old_unf) = simplBinder env bndr -- Normal case
- | otherwise = seqId id2 `seq` return (env', id2)
+ | isId bndr && hasSomeUnfolding old_unf = seqId id2 `seq` return (env2, id2) -- Special case
+ | otherwise = simplBinder env bndr -- Normal case
where
old_unf = idUnfolding bndr
- (env', id1) = substIdBndr env bndr
- id2 = id1 `setIdUnfolding` substUnfolding env old_unf
+ (env1, id1) = substIdBndr env bndr
+ id2 = id1 `setIdUnfolding` substUnfolding env old_unf
+ env2 = modifyInScope env1 id1 id2
---------------
simplNonRecBndr :: SimplEnv -> InBndr -> SimplM (SimplEnv, OutBndr)
---------------
simplRecBndrs :: SimplEnv -> [InBndr] -> SimplM SimplEnv
-- Recursive let binders
-simplRecBndrs env@(SimplEnv { seInScope = in_scope, seIdSubst = id_subst }) ids
+simplRecBndrs env@(SimplEnv {}) ids
= do { let (env1, ids1) = mapAccumL substIdBndr env ids
; seqIds ids1 `seq` return env1 }
------------------
substIdType :: SimplEnv -> Id -> Id
-substIdType env@(SimplEnv { seInScope = in_scope, seTvSubst = tv_env}) id
+substIdType (SimplEnv { seInScope = in_scope, seTvSubst = tv_env}) id
| isEmptyVarEnv tv_env || isEmptyVarSet (tyVarsOfType old_ty) = id
| otherwise = Id.setIdType id (Type.substTy (TvSubst in_scope tv_env) old_ty)
-- The tyVarsOfType is cheaper than it looks
------------------
substUnfolding :: SimplEnv -> Unfolding -> Unfolding
-substUnfolding env NoUnfolding = NoUnfolding
-substUnfolding env (OtherCon cons) = OtherCon cons
+substUnfolding _ NoUnfolding = NoUnfolding
+substUnfolding _ (OtherCon cons) = OtherCon cons
substUnfolding env (CompulsoryUnfolding rhs) = CompulsoryUnfolding (substExpr env rhs)
substUnfolding env (CoreUnfolding rhs t v w g) = CoreUnfolding (substExpr env rhs) t v w g
------------------
substWorker :: SimplEnv -> WorkerInfo -> WorkerInfo
-substWorker env NoWorker = NoWorker
+substWorker _ NoWorker = NoWorker
substWorker env wkr_info = CoreSubst.substWorker (mkCoreSubst env) wkr_info
\end{code}
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