hashExpr,
-- Equality
- cheapEqExpr, eqExpr, applyTypeToArgs, applyTypeToArg
+ cheapEqExpr, tcEqExpr, tcEqExprX, applyTypeToArgs, applyTypeToArg
) where
#include "HsVersions.h"
import GLAEXTS -- For `xori`
import CoreSyn
+import CoreFVs ( exprFreeVars )
import PprCore ( pprCoreExpr )
-import Var ( Var, isId, isTyVar )
+import Var ( Var )
+import VarSet ( unionVarSet )
import VarEnv
import Name ( hashName )
import Packages ( isDllName )
import IdInfo ( GlobalIdDetails(..), megaSeqIdInfo )
import NewDemand ( appIsBottom )
import Type ( Type, mkFunTy, mkForAllTy, splitFunTy_maybe,
- splitFunTy,
+ splitFunTy, tcEqTypeX,
applyTys, isUnLiftedType, seqType, mkTyVarTy,
splitForAllTy_maybe, isForAllTy, splitRecNewType_maybe,
- splitTyConApp_maybe, eqType, funResultTy, applyTy,
- funResultTy, applyTy
+ splitTyConApp_maybe, coreEqType, funResultTy, applyTy
)
import TyCon ( tyConArity )
-- gaw 2004
import Unique ( Unique )
import Outputable
import TysPrim ( alphaTy ) -- Debugging only
-import Util ( equalLength, lengthAtLeast )
+import Util ( equalLength, lengthAtLeast, foldl2 )
\end{code}
exprType (Var var) = idType var
exprType (Lit lit) = literalType lit
exprType (Let _ body) = exprType body
--- gaw 2004
exprType (Case _ _ ty alts) = ty
exprType (Note (Coerce ty _) e) = ty -- **! should take usage from e
exprType (Note other_note e) = exprType e
mkCoerce2 :: Type -> Type -> CoreExpr -> CoreExpr
mkCoerce2 to_ty from_ty (Note (Coerce to_ty2 from_ty2) expr)
- = ASSERT( from_ty `eqType` to_ty2 )
+ = ASSERT( from_ty `coreEqType` to_ty2 )
mkCoerce2 to_ty from_ty2 expr
mkCoerce2 to_ty from_ty expr
- | to_ty `eqType` from_ty = expr
- | otherwise = ASSERT( from_ty `eqType` exprType expr )
+ | to_ty `coreEqType` from_ty = expr
+ | otherwise = ASSERT( from_ty `coreEqType` exprType expr )
Note (Coerce to_ty from_ty) expr
\end{code}
-- deals with them perfectly well.
bindNonRec bndr rhs body
--- gaw 2004
| needsCaseBinding (idType bndr) rhs = Case rhs bndr (exprType body) [(DEFAULT,[],body)]
| otherwise = Let (NonRec bndr rhs) body
mkIfThenElse :: CoreExpr -> CoreExpr -> CoreExpr -> CoreExpr
mkIfThenElse guard then_expr else_expr
--- gaw 2004
-- Not going to be refining, so okay to take the type of the "then" clause
= Case guard (mkWildId boolTy) (exprType then_expr)
- [ (DataAlt trueDataCon, [], then_expr),
- (DataAlt falseDataCon, [], else_expr) ]
+ [ (DataAlt falseDataCon, [], else_expr), -- Increasing order of tag!
+ (DataAlt trueDataCon, [], then_expr) ]
\end{code}
= case alts of
(deflt@(DEFAULT,_,_):alts) -> go alts deflt
other -> go alts panic_deflt
-
where
panic_deflt = pprPanic "Missing alternative" (ppr con $$ vcat (map ppr alts))
- go [] deflt = deflt
- go (alt@(con1,_,_) : alts) deflt | con == con1 = alt
- | otherwise = ASSERT( not (con1 == DEFAULT) )
- go alts deflt
+ go [] deflt = deflt
+ go (alt@(con1,_,_) : alts) deflt
+ = case con `cmpAltCon` con1 of
+ LT -> deflt -- Missed it already; the alts are in increasing order
+ EQ -> alt
+ GT -> ASSERT( not (con1 == DEFAULT) ) go alts deflt
\end{code}
exprIsCheap (Note InlineMe e) = True
exprIsCheap (Note _ e) = exprIsCheap e
exprIsCheap (Lam x e) = isRuntimeVar x || exprIsCheap e
--- gaw 2004
exprIsCheap (Case e _ _ alts) = exprIsCheap e &&
and [exprIsCheap rhs | (_,_,rhs) <- alts]
-- Experimentally, treat (case x of ...) as cheap
-- n is the number of args
go n (Note _ e) = go n e
go n (Let _ e) = go n e
--- gaw 2004
go n (Case e _ _ _) = go 0 e -- Just check the scrut
go n (App e _) = go (n+1) e
go n (Var v) = idAppIsBottom v n
go n (Lit _) = False
go n (Lam _ _) = False
+ go n (Type _) = False
idAppIsBottom :: Id -> Int -> Bool
idAppIsBottom id n_val_args = appIsBottom (idNewStrictness id) n_val_args
-- ===>
-- f x y = case x of { (a,b) -> e }
-- The difference is observable using 'seq'
--- gaw 2004
arityType (Case scrut _ _ alts) = case foldr1 andArityType [arityType rhs | (_,_,rhs) <- alts] of
xs@(AFun one_shot _) | one_shot -> xs
xs | exprIsCheap scrut -> xs
cheapEqExpr (Var v1) (Var v2) = v1==v2
cheapEqExpr (Lit lit1) (Lit lit2) = lit1 == lit2
-cheapEqExpr (Type t1) (Type t2) = t1 `eqType` t2
+cheapEqExpr (Type t1) (Type t2) = t1 `coreEqType` t2
cheapEqExpr (App f1 a1) (App f2 a2)
= f1 `cheapEqExpr` f2 && a1 `cheapEqExpr` a2
\begin{code}
-eqExpr :: CoreExpr -> CoreExpr -> Bool
- -- Works ok at more general type, but only needed at CoreExpr
- -- Used in rule matching, so when we find a type we use
- -- eqTcType, which doesn't look through newtypes
- -- [And it doesn't risk falling into a black hole either.]
-eqExpr e1 e2
- = eq emptyVarEnv e1 e2
+tcEqExpr :: CoreExpr -> CoreExpr -> Bool
+-- Used in rule matching, so does *not* look through
+-- newtypes, predicate types; hence tcEqExpr
+
+tcEqExpr e1 e2 = tcEqExprX rn_env e1 e2
where
- -- The "env" maps variables in e1 to variables in ty2
- -- So when comparing lambdas etc,
- -- we in effect substitute v2 for v1 in e1 before continuing
- eq env (Var v1) (Var v2) = case lookupVarEnv env v1 of
- Just v1' -> v1' == v2
- Nothing -> v1 == v2
-
- eq env (Lit lit1) (Lit lit2) = lit1 == lit2
- eq env (App f1 a1) (App f2 a2) = eq env f1 f2 && eq env a1 a2
- eq env (Lam v1 e1) (Lam v2 e2) = eq (extendVarEnv env v1 v2) e1 e2
- eq env (Let (NonRec v1 r1) e1)
- (Let (NonRec v2 r2) e2) = eq env r1 r2 && eq (extendVarEnv env v1 v2) e1 e2
- eq env (Let (Rec ps1) e1)
- (Let (Rec ps2) e2) = equalLength ps1 ps2 &&
- and (zipWith eq_rhs ps1 ps2) &&
- eq env' e1 e2
+ rn_env = mkRnEnv2 (mkInScopeSet (exprFreeVars e1 `unionVarSet` exprFreeVars e2))
+
+tcEqExprX :: RnEnv2 -> CoreExpr -> CoreExpr -> Bool
+tcEqExprX env (Var v1) (Var v2) = rnOccL env v1 == rnOccR env v2
+tcEqExprX env (Lit lit1) (Lit lit2) = lit1 == lit2
+tcEqExprX env (App f1 a1) (App f2 a2) = tcEqExprX env f1 f2 && tcEqExprX env a1 a2
+tcEqExprX env (Lam v1 e1) (Lam v2 e2) = tcEqExprX (rnBndr2 env v1 v2) e1 e2
+tcEqExprX env (Let (NonRec v1 r1) e1)
+ (Let (NonRec v2 r2) e2) = tcEqExprX env r1 r2
+ && tcEqExprX (rnBndr2 env v1 v2) e1 e2
+tcEqExprX env (Let (Rec ps1) e1)
+ (Let (Rec ps2) e2) = equalLength ps1 ps2
+ && and (zipWith eq_rhs ps1 ps2)
+ && tcEqExprX env' e1 e2
where
- env' = extendVarEnvList env [(v1,v2) | ((v1,_),(v2,_)) <- zip ps1 ps2]
- eq_rhs (_,r1) (_,r2) = eq env' r1 r2
- eq env (Case e1 v1 t1 a1)
- (Case e2 v2 t2 a2) = eq env e1 e2 &&
- t1 `eqType` t2 &&
- equalLength a1 a2 &&
- and (zipWith (eq_alt env') a1 a2)
+ env' = foldl2 rn_bndr2 env ps2 ps2
+ rn_bndr2 env (b1,_) (b2,_) = rnBndr2 env b1 b2
+ eq_rhs (_,r1) (_,r2) = tcEqExprX env' r1 r2
+tcEqExprX env (Case e1 v1 t1 a1)
+ (Case e2 v2 t2 a2) = tcEqExprX env e1 e2
+ && tcEqTypeX env t1 t2
+ && equalLength a1 a2
+ && and (zipWith (eq_alt env') a1 a2)
where
- env' = extendVarEnv env v1 v2
+ env' = rnBndr2 env v1 v2
- eq env (Note n1 e1) (Note n2 e2) = eq_note env n1 n2 && eq env e1 e2
- eq env (Type t1) (Type t2) = t1 `eqType` t2
- eq env e1 e2 = False
+tcEqExprX env (Note n1 e1) (Note n2 e2) = eq_note env n1 n2 && tcEqExprX env e1 e2
+tcEqExprX env (Type t1) (Type t2) = tcEqTypeX env t1 t2
+tcEqExprX env e1 e2 = False
- eq_list env [] [] = True
- eq_list env (e1:es1) (e2:es2) = eq env e1 e2 && eq_list env es1 es2
- eq_list env es1 es2 = False
-
- eq_alt env (c1,vs1,r1) (c2,vs2,r2) = c1==c2 &&
- eq (extendVarEnvList env (vs1 `zip` vs2)) r1 r2
-
- eq_note env (SCC cc1) (SCC cc2) = cc1 == cc2
- eq_note env (Coerce t1 f1) (Coerce t2 f2) = t1 `eqType` t2 && f1 `eqType` f2
- eq_note env InlineCall InlineCall = True
- eq_note env (CoreNote s1) (CoreNote s2) = s1 == s2
- eq_note env other1 other2 = False
+eq_alt env (c1,vs1,r1) (c2,vs2,r2) = c1==c2 && tcEqExprX (rnBndrs2 env vs1 vs2) r1 r2
+
+eq_note env (SCC cc1) (SCC cc2) = cc1 == cc2
+eq_note env (Coerce t1 f1) (Coerce t2 f2) = tcEqTypeX env t1 t2 && tcEqTypeX env f1 f2
+eq_note env InlineCall InlineCall = True
+eq_note env (CoreNote s1) (CoreNote s2) = s1 == s2
+eq_note env other1 other2 = False
\end{code}
exprSize (App f a) = exprSize f + exprSize a
exprSize (Lam b e) = varSize b + exprSize e
exprSize (Let b e) = bindSize b + exprSize e
--- gaw 2004
exprSize (Case e b t as) = seqType t `seq` exprSize e + varSize b + 1 + foldr ((+) . altSize) 0 as
exprSize (Note n e) = noteSize n + exprSize e
exprSize (Type t) = seqType t `seq` 1
hash_expr (Note _ e) = hash_expr e
hash_expr (Let (NonRec b r) e) = hashId b
hash_expr (Let (Rec ((b,r):_)) e) = hashId b
--- gaw 2004
hash_expr (Case _ b _ _) = hashId b
hash_expr (App f e) = hash_expr f * fast_hash_expr e
hash_expr (Var v) = hashId v
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