module CoreSyn (
Expr(..), Alt, Bind(..), AltCon(..), Arg, Note(..),
CoreExpr, CoreAlt, CoreBind, CoreArg, CoreBndr,
- TaggedExpr, TaggedAlt, TaggedBind, TaggedArg,
+ TaggedExpr, TaggedAlt, TaggedBind, TaggedArg, TaggedBndr(..),
mkLets, mkLams,
mkApps, mkTyApps, mkValApps, mkVarApps,
mkConApp,
varToCoreExpr,
- isTyVar, isId,
+ isTyVar, isId, cmpAltCon, cmpAlt, ltAlt,
bindersOf, bindersOfBinds, rhssOfBind, rhssOfAlts,
collectBinders, collectTyBinders, collectValBinders, collectTyAndValBinders,
collectArgs,
-- Unfoldings
Unfolding(..), UnfoldingGuidance(..), -- Both abstract everywhere but in CoreUnfold.lhs
- noUnfolding, mkOtherCon,
+ noUnfolding, evaldUnfolding, mkOtherCon,
unfoldingTemplate, maybeUnfoldingTemplate, otherCons,
isValueUnfolding, isEvaldUnfolding, isCheapUnfolding, isCompulsoryUnfolding,
hasUnfolding, hasSomeUnfolding, neverUnfold,
-- Annotated expressions
AnnExpr, AnnExpr'(..), AnnBind(..), AnnAlt,
- deAnnotate, deAnnotate', deAnnAlt,
+ deAnnotate, deAnnotate', deAnnAlt, collectAnnBndrs,
-- Core rules
CoreRules(..), -- Representation needed by friends
CoreRule(..), -- CoreSubst, CoreTidy, CoreFVs, PprCore only
- IdCoreRule,
+ IdCoreRule(..), isOrphanRule,
RuleName,
emptyCoreRules, isEmptyCoreRules, rulesRhsFreeVars, rulesRules,
isBuiltinRule, ruleName
import Var ( Var, Id, TyVar, isTyVar, isId )
import Type ( Type, mkTyVarTy, seqType )
import Literal ( Literal, mkMachInt )
-import DataCon ( DataCon, dataConId )
+import DataCon ( DataCon, dataConWorkId, dataConTag )
import BasicTypes ( Activation )
import VarSet
+import FastString
import Outputable
\end{code}
| App (Expr b) (Arg b)
| Lam b (Expr b)
| Let (Bind b) (Expr b)
- | Case (Expr b) b [Alt b] -- Binder gets bound to value of scrutinee
- -- DEFAULT case must be *first*, if it occurs at all
+ | Case (Expr b) b Type [Alt b] -- Binder gets bound to value of scrutinee
+ -- Invariant: The list of alternatives is ALWAYS EXHAUSTIVE,
+ -- meaning that it covers all cases that can occur
+ -- See the example below
+ --
+ -- Invariant: The DEFAULT case must be *first*, if it occurs at all
+ -- Invariant: The remaining cases are in order of increasing
+ -- tag (for DataAlts)
+ -- lit (for LitAlts)
+ -- This makes finding the relevant constructor easy,
+ -- and makes comparison easier too
| Note Note (Expr b)
| Type Type -- This should only show up at the top
-- level of an Arg
+-- An "exhausive" case does not necessarily mention all constructors:
+-- data Foo = Red | Green | Blue
+--
+-- ...case x of
+-- Red -> True
+-- other -> f (case x of
+-- Green -> ...
+-- Blue -> ... )
+-- The inner case does not need a Red alternative, because x can't be Red at
+-- that program point.
+
+
type Arg b = Expr b -- Can be a Type
type Alt b = (AltCon, [b], Expr b) -- (DEFAULT, [], rhs) is the default alternative
| DEFAULT
deriving (Eq, Ord)
+
data Bind b = NonRec b (Expr b)
| Rec [(b, (Expr b))]
| InlineMe -- Instructs simplifer to treat the enclosed expression
-- as very small, and inline it at its call sites
+ | CoreNote String -- A generic core annotation, propagated but not used by GHC
+
-- NOTE: we also treat expressions wrapped in InlineMe as
-- 'cheap' and 'dupable' (in the sense of exprIsCheap, exprIsDupable)
-- What this means is that we obediently inline even things that don't
\end{code}
\begin{code}
-type RuleName = FAST_STRING
-type IdCoreRule = (Id,CoreRule) -- Rules don't have their leading Id inside them
+type RuleName = FastString
+data IdCoreRule = IdCoreRule Id -- A rule for this Id
+ Bool -- True <=> orphan rule
+ CoreRule -- The rule itself
+
+isOrphanRule :: IdCoreRule -> Bool
+isOrphanRule (IdCoreRule _ is_orphan _) = is_orphan
data CoreRule
= Rule RuleName
-- a context (case (thing args) of ...),
-- (where there are the right number of arguments.)
-noUnfolding = NoUnfolding
-mkOtherCon = OtherCon
+noUnfolding = NoUnfolding
+evaldUnfolding = OtherCon []
+
+mkOtherCon = OtherCon
seqUnfolding :: Unfolding -> ()
seqUnfolding (CoreUnfolding e top b1 b2 g)
instance Show AltCon where
showsPrec p con = showsPrecSDoc p (ppr con)
+
+cmpAlt :: Alt b -> Alt b -> Ordering
+cmpAlt (con1, _, _) (con2, _, _) = con1 `cmpAltCon` con2
+
+ltAlt :: Alt b -> Alt b -> Bool
+ltAlt a1 a2 = case a1 `cmpAlt` a2 of { LT -> True; other -> False }
+
+cmpAltCon :: AltCon -> AltCon -> Ordering
+-- Compares AltCons within a single list of alternatives
+cmpAltCon DEFAULT DEFAULT = EQ
+cmpAltCon DEFAULT con = LT
+
+cmpAltCon (DataAlt d1) (DataAlt d2) = dataConTag d1 `compare` dataConTag d2
+cmpAltCon (DataAlt _) DEFAULT = GT
+cmpAltCon (LitAlt l1) (LitAlt l2) = l1 `compare` l2
+cmpAltCon (LitAlt _) DEFAULT = GT
+
+cmpAltCon con1 con2 = WARN( True, text "Comparing incomparable AltCons" <+>
+ ppr con1 <+> ppr con2 )
+ LT
\end{code}
Binders are ``tagged'' with a \tr{t}:
\begin{code}
-type Tagged t = (CoreBndr, t)
+data TaggedBndr t = TB CoreBndr t -- TB for "tagged binder"
+
+type TaggedBind t = Bind (TaggedBndr t)
+type TaggedExpr t = Expr (TaggedBndr t)
+type TaggedArg t = Arg (TaggedBndr t)
+type TaggedAlt t = Alt (TaggedBndr t)
-type TaggedBind t = Bind (Tagged t)
-type TaggedExpr t = Expr (Tagged t)
-type TaggedArg t = Arg (Tagged t)
-type TaggedAlt t = Alt (Tagged t)
+instance Outputable b => Outputable (TaggedBndr b) where
+ ppr (TB b l) = char '<' <> ppr b <> comma <> ppr l <> char '>'
+
+instance Outputable b => OutputableBndr (TaggedBndr b) where
+ pprBndr _ b = ppr b -- Simple
\end{code}
mkLams :: [b] -> Expr b -> Expr b
mkLit lit = Lit lit
-mkConApp con args = mkApps (Var (dataConId con)) args
+mkConApp con args = mkApps (Var (dataConWorkId con)) args
mkLams binders body = foldr Lam body binders
mkLets binds body = foldr Let body binds
\begin{code}
seqExpr :: CoreExpr -> ()
-seqExpr (Var v) = v `seq` ()
-seqExpr (Lit lit) = lit `seq` ()
-seqExpr (App f a) = seqExpr f `seq` seqExpr a
-seqExpr (Lam b e) = seqBndr b `seq` seqExpr e
-seqExpr (Let b e) = seqBind b `seq` seqExpr e
-seqExpr (Case e b as) = seqExpr e `seq` seqBndr b `seq` seqAlts as
-seqExpr (Note n e) = seqNote n `seq` seqExpr e
-seqExpr (Type t) = seqType t
+seqExpr (Var v) = v `seq` ()
+seqExpr (Lit lit) = lit `seq` ()
+seqExpr (App f a) = seqExpr f `seq` seqExpr a
+seqExpr (Lam b e) = seqBndr b `seq` seqExpr e
+seqExpr (Let b e) = seqBind b `seq` seqExpr e
+-- gaw 2004
+seqExpr (Case e b t as) = seqExpr e `seq` seqBndr b `seq` seqType t `seq` seqAlts as
+seqExpr (Note n e) = seqNote n `seq` seqExpr e
+seqExpr (Type t) = seqType t
seqExprs [] = ()
seqExprs (e:es) = seqExpr e `seq` seqExprs es
seqNote (Coerce t1 t2) = seqType t1 `seq` seqType t2
+seqNote (CoreNote s) = s `seq` ()
seqNote other = ()
seqBndr b = b `seq` ()
| AnnLit Literal
| AnnLam bndr (AnnExpr bndr annot)
| AnnApp (AnnExpr bndr annot) (AnnExpr bndr annot)
- | AnnCase (AnnExpr bndr annot) bndr [AnnAlt bndr annot]
+-- gaw 2004
+ | AnnCase (AnnExpr bndr annot) bndr Type [AnnAlt bndr annot]
| AnnLet (AnnBind bndr annot) (AnnExpr bndr annot)
| AnnNote Note (AnnExpr bndr annot)
| AnnType Type
deAnnBind (AnnNonRec var rhs) = NonRec var (deAnnotate rhs)
deAnnBind (AnnRec pairs) = Rec [(v,deAnnotate rhs) | (v,rhs) <- pairs]
-deAnnotate' (AnnCase scrut v alts)
- = Case (deAnnotate scrut) v (map deAnnAlt alts)
+-- gaw 2004
+deAnnotate' (AnnCase scrut v t alts)
+ = Case (deAnnotate scrut) v t (map deAnnAlt alts)
deAnnAlt :: AnnAlt bndr annot -> Alt bndr
deAnnAlt (con,args,rhs) = (con,args,deAnnotate rhs)
\end{code}
+\begin{code}
+collectAnnBndrs :: AnnExpr bndr annot -> ([bndr], AnnExpr bndr annot)
+collectAnnBndrs e
+ = collect [] e
+ where
+ collect bs (_, AnnLam b body) = collect (b:bs) body
+ collect bs body = (reverse bs, body)
+\end{code}
projects / ghc-hetmet.git / blobdiff