%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1995
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
%
\section[CoreSyn]{A data type for the Haskell compiler midsection}
#include "HsVersions.h"
module CoreSyn (
- GenCoreBinding(..), GenCoreExpr(..), GenCoreAtom(..),
- GenCoreCaseAlternatives(..), GenCoreCaseDefault(..),
- pprCoreBinding, pprCoreExpr,
-
- GenCoreArg(..), applyToArgs, decomposeArgs, collectArgs,
+ GenCoreBinding(..), GenCoreExpr(..),
+ GenCoreArg(..),GenCoreBinder(..), GenCoreCaseAlts(..),
+ GenCoreCaseDefault(..),
+
+ bindersOf, pairsFromCoreBinds, rhssOfBind,
+
+ mkGenApp, mkValApp, mkTyApp, mkUseApp,
+ mkApp, mkCon, mkPrim,
+ mkValLam, mkTyLam, mkUseLam,
+ mkLam,
+ digForLambdas,
+
+ collectArgs, isValArg,
+
+ mkCoLetAny, mkCoLetNoUnboxed, mkCoLetUnboxedToCase,
+ mkCoLetsAny, mkCoLetsNoUnboxed, mkCoLetsUnboxedToCase,
+ mkCoLetrecAny, mkCoLetrecNoUnboxed,
+
+ rhssOfAlts,
+
+ -- Common type instantiation...
+ CoreBinding(..),
+ CoreExpr(..),
+ CoreBinder(..),
+ CoreArg(..),
+ CoreCaseAlts(..),
+ CoreCaseDefault(..),
+
+ -- And not-so-common type instantiations...
+ TaggedCoreBinding(..),
+ TaggedCoreExpr(..),
+ TaggedCoreBinder(..),
+ TaggedCoreArg(..),
+ TaggedCoreCaseAlts(..),
+ TaggedCoreCaseDefault(..),
+
+ SimplifiableCoreBinding(..),
+ SimplifiableCoreExpr(..),
+ SimplifiableCoreBinder(..),
+ SimplifiableCoreArg(..),
+ SimplifiableCoreCaseAlts(..),
+ SimplifiableCoreCaseDefault(..)
-- and to make the interface self-sufficient ...
+
) where
-import PrelInfo ( PrimOp, PrimRep
- IF_ATTACK_PRAGMAS(COMMA tagOf_PrimOp)
- IF_ATTACK_PRAGMAS(COMMA pprPrimOp)
- )
-import Type ( isPrimType, pprParendUniType, TyVar, TyCon, Type
- )
-import Literal ( Literal )
-import Id ( getIdUniType, isBottomingId, Id
- IF_ATTACK_PRAGMAS(COMMA bottomIsGuaranteed)
- )
-import Outputable
-import Pretty
+import Ubiq{-uitous-}
+
import CostCentre ( showCostCentre, CostCentre )
-import Util
+import Id ( idType )
+import Usage ( UVar(..) )
+import Util ( panic, assertPanic )
+
+isUnboxedDataType = panic "CoreSyn.isUnboxedDataType"
+--eqId :: Id -> Id -> Bool
+eqId = panic "CoreSyn.eqId"
\end{code}
%************************************************************************
| Rec [(val_bdr, GenCoreExpr val_bdr val_occ tyvar uvar)]
\end{code}
+\begin{code}
+bindersOf :: GenCoreBinding val_bdr val_occ tyvar uvar -> [val_bdr]
+
+pairsFromCoreBinds ::
+ [GenCoreBinding val_bdr val_occ tyvar uvar] ->
+ [(val_bdr, GenCoreExpr val_bdr val_occ tyvar uvar)]
+
+rhssOfBind :: GenCoreBinding val_bdr val_occ tyvar uvar -> [GenCoreExpr val_bdr val_occ tyvar uvar]
+
+bindersOf (NonRec binder _) = [binder]
+bindersOf (Rec pairs) = [binder | (binder, _) <- pairs]
+
+pairsFromCoreBinds [] = []
+pairsFromCoreBinds ((NonRec b e) : bs) = (b,e) : pairsFromCoreBinds bs
+pairsFromCoreBinds ((Rec pairs) : bs) = pairs ++ pairsFromCoreBinds bs
+
+rhssOfBind (NonRec _ rhs) = [rhs]
+rhssOfBind (Rec pairs) = [rhs | (_,rhs) <- pairs]
+\end{code}
%************************************************************************
%* *
desugarer sets up constructors as applications of global @Vars@s.
\begin{code}
- | Con Id (GenType tyvar) [GenCoreArg val_occ tyvar uvar]
+ | Con Id [GenCoreArg val_occ tyvar uvar]
-- Saturated constructor application:
-- The constructor is a function of the form:
-- /\ a1 -> ... /\ am -> \ b1 -> ... \ bn ->
-- <expr> where "/\" is a type lambda and "\" the
-- regular kind; there will be "m" Types and
-- "n" bindees in the Con args.
- --
- -- The type given is the result type of the application;
- -- you can figure out the argument types from it if you want.
- | Prim PrimOp Type [GenCoreArg val_occ tyvar uvar]
+ | Prim PrimOp [GenCoreArg val_occ tyvar uvar]
-- saturated primitive operation;
-- comment on Cons applies here, too.
- -- The types work the same way
- -- (PrimitiveOps may be polymorphic).
\end{code}
Ye olde abstraction and application operators.
Case expressions (\tr{case <expr> of <List of alternatives>}): there
are really two flavours masquerading here---those for scrutinising
{\em algebraic} types and those for {\em primitive} types. Please see
-under @GenCoreCaseAlternatives@.
+under @GenCoreCaseAlts@.
\begin{code}
| Case (GenCoreExpr val_bdr val_occ tyvar uvar)
- (GenCoreCaseAlternatives val_bdr val_occ tyvar uvar)
+ (GenCoreCaseAlts val_bdr val_occ tyvar uvar)
\end{code}
A Core case expression \tr{case e of v -> ...} implies evaluation of
scoping.
\begin{code}
| Let (GenCoreBinding val_bdr val_occ tyvar uvar)
- (GenCoreExpr binder val_occ tyvar uvar)
+ (GenCoreExpr val_bdr val_occ tyvar uvar)
-- both recursive and non-.
-- The "GenCoreBinding" records that information
\end{code}
%************************************************************************
%* *
+\subsection{Core-constructing functions with checking}
+%* *
+%************************************************************************
+
+When making @Lets@, we may want to take evasive action if the thing
+being bound has unboxed type. We have different variants ...
+
+@mkCoLet(s|rec)Any@ let-binds any binding, regardless of type
+@mkCoLet(s|rec)NoUnboxed@ prohibits unboxed bindings
+@mkCoLet(s)UnboxedToCase@ converts an unboxed binding to a case
+ (unboxed bindings in a letrec are still prohibited)
+
+\begin{code}
+mkCoLetAny :: GenCoreBinding val_bdr val_occ tyvar uvar
+ -> GenCoreExpr val_bdr val_occ tyvar uvar
+ -> GenCoreExpr val_bdr val_occ tyvar uvar
+mkCoLetsAny :: [GenCoreBinding val_bdr val_occ tyvar uvar] ->
+ GenCoreExpr val_bdr val_occ tyvar uvar ->
+ GenCoreExpr val_bdr val_occ tyvar uvar
+mkCoLetrecAny :: [(val_bdr, GenCoreExpr val_bdr val_occ tyvar uvar)]
+ -> GenCoreExpr val_bdr val_occ tyvar uvar
+ -> GenCoreExpr val_bdr val_occ tyvar uvar
+
+mkCoLetrecAny [] body = body
+mkCoLetrecAny binds body = Let (Rec binds) body
+
+mkCoLetsAny [] expr = expr
+mkCoLetsAny binds expr = foldr mkCoLetAny expr binds
+
+mkCoLetAny bind@(Rec binds) body = mkCoLetrecAny binds body
+mkCoLetAny bind@(NonRec binder rhs) body
+ = case body of
+ Var binder2 | binder `eqId` binder2
+ -> rhs -- hey, I have the rhs
+ other
+ -> Let bind body
+\end{code}
+
+\begin{code}
+--mkCoLetNoUnboxed ::
+-- GenCoreBinding val_bdr val_occ tyvar uvar ->
+-- GenCoreExpr val_bdr val_occ tyvar uvar ->
+-- GenCoreExpr val_bdr val_occ tyvar uvar
+
+mkCoLetNoUnboxed bind@(Rec binds) body
+ = mkCoLetrecNoUnboxed binds body
+mkCoLetNoUnboxed bind@(NonRec binder rhs) body
+ = --ASSERT (not (isUnboxedDataType (idType binder)))
+ case body of
+ Var binder2 | binder `eqId` binder2
+ -> rhs -- hey, I have the rhs
+ other
+ -> Let bind body
+
+mkCoLetsNoUnboxed [] expr = expr
+mkCoLetsNoUnboxed binds expr = foldr mkCoLetNoUnboxed expr binds
+
+--mkCoLetrecNoUnboxed :: [(Id, CoreExpr)] -- bindings
+-- -> CoreExpr -- body
+-- -> CoreExpr -- result
+
+mkCoLetrecNoUnboxed [] body = body
+mkCoLetrecNoUnboxed binds body
+ = ASSERT (all is_boxed_bind binds)
+ Let (Rec binds) body
+ where
+ is_boxed_bind (binder, rhs)
+ = (not . isUnboxedDataType . idType) binder
+\end{code}
+
+\begin{code}
+--mkCoLetUnboxedToCase ::
+-- GenCoreBinding val_bdr val_occ tyvar uvar ->
+-- GenCoreExpr val_bdr val_occ tyvar uvar ->
+-- GenCoreExpr val_bdr val_occ tyvar uvar
+
+mkCoLetUnboxedToCase bind@(Rec binds) body
+ = mkCoLetrecNoUnboxed binds body
+mkCoLetUnboxedToCase bind@(NonRec binder rhs) body
+ = case body of
+ Var binder2 | binder `eqId` binder2
+ -> rhs -- hey, I have the rhs
+ other
+ -> if (not (isUnboxedDataType (idType binder))) then
+ Let bind body -- boxed...
+ else
+ Case rhs -- unboxed...
+ (PrimAlts []
+ (BindDefault binder body))
+
+mkCoLetsUnboxedToCase [] expr = expr
+mkCoLetsUnboxedToCase binds expr = foldr mkCoLetUnboxedToCase expr binds
+\end{code}
+
+%************************************************************************
+%* *
\subsection{Case alternatives in @GenCoreExpr@}
%* *
%************************************************************************
\end{verbatim}
\begin{code}
-data GenCoreCaseAlternatives val_bdr val_occ tyvar uvar
-
+data GenCoreCaseAlts val_bdr val_occ tyvar uvar
= AlgAlts [(Id, -- alts: data constructor,
[val_bdr], -- constructor's parameters,
GenCoreExpr val_bdr val_occ tyvar uvar)] -- rhs.
-- be used in RHS.
\end{code}
+\begin{code}
+rhssOfAlts (AlgAlts alts deflt) = rhssOfDeflt deflt ++ [rhs | (_,_,rhs) <- alts]
+rhssOfAlts (PrimAlts alts deflt) = rhssOfDeflt deflt ++ [rhs | (_,rhs) <- alts]
+
+rhssOfDeflt NoDefault = []
+rhssOfDeflt (BindDefault _ rhs) = [rhs]
+\end{code}
+
%************************************************************************
%* *
-\subsection[CoreSyn-arguments]{Core ``argument'' wrapper type}
+\subsection{Core binders}
%* *
%************************************************************************
\begin{code}
-data GenCoreAtom val_occ tyvar uvar
- = LitAtom Literal
- | VarAtom val_occ
- | TyAtom (GenType tyvar)
- | UsageAtom (Usage uvar)
-
+data GenCoreBinder val_bdr tyvar uvar
+ = ValBinder val_bdr
+ | TyBinder tyvar
+ | UsageBinder uvar
+\end{code}
-===+*** fix from here down ****===
-=================================
+Clump Lams together if possible.
-instance Outputable bindee => Outputable (GenCoreArg bindee) where
- ppr sty (ValArg atom) = ppr sty atom
- ppr sty (TypeArg ty) = ppr sty ty
+\begin{code}
+mkValLam :: [val_bdr]
+ -> GenCoreExpr val_bdr val_occ tyvar uvar
+ -> GenCoreExpr val_bdr val_occ tyvar uvar
+mkTyLam :: [tyvar]
+ -> GenCoreExpr val_bdr val_occ tyvar uvar
+ -> GenCoreExpr val_bdr val_occ tyvar uvar
+mkUseLam :: [uvar]
+ -> GenCoreExpr val_bdr val_occ tyvar uvar
+ -> GenCoreExpr val_bdr val_occ tyvar uvar
+
+mkValLam binders body = foldr (Lam . ValBinder) body binders
+mkTyLam binders body = foldr (Lam . TyBinder) body binders
+mkUseLam binders body = foldr (Lam . UsageBinder) body binders
+
+mkLam :: [tyvar] -> [val_bdr] -- ToDo: could add a [uvar] arg...
+ -> GenCoreExpr val_bdr val_occ tyvar uvar
+ -> GenCoreExpr val_bdr val_occ tyvar uvar
+
+mkLam tyvars valvars body
+ = mkTyLam tyvars (mkValLam valvars body)
\end{code}
+We often want to strip off leading lambdas before getting down to
+business. @digForLambdas@ is your friend.
+
+We expect (by convention) usage-, type-, and value- lambdas in that
+order.
+
\begin{code}
-applyToArgs :: GenCoreExpr val_bdr bindee
- -> [GenCoreArg bindee]
- -> GenCoreExpr val_bdr bindee
+digForLambdas ::
+ GenCoreExpr val_bdr val_occ tyvar uvar ->
+ ([uvar], [tyvar], [val_bdr], GenCoreExpr val_bdr val_occ tyvar uvar)
-applyToArgs fun [] = fun
-applyToArgs fun (ValArg val : args) = applyToArgs (App fun val) args
-applyToArgs fun (TypeArg ty : args) = applyToArgs (CoTyApp fun ty) args
+digForLambdas (Lam (UsageBinder u) body)
+ = let
+ (uvars, tyvars, args, final_body) = digForLambdas body
+ in
+ (u:uvars, tyvars, args, final_body)
+
+digForLambdas other
+ = let
+ (tyvars, args, body) = dig_for_tyvars other
+ in
+ ([], tyvars, args, body)
+ where
+ dig_for_tyvars (Lam (TyBinder tv) body)
+ = let
+ (tyvars, args, body2) = dig_for_tyvars body
+ in
+ (tv : tyvars, args, body2)
+
+ dig_for_tyvars body
+ = ASSERT(not (usage_lambda body))
+ let
+ (args, body2) = dig_for_valvars body
+ in
+ ([], args, body2)
+
+ ---------------------------------------
+ dig_for_valvars (Lam (ValBinder v) body)
+ = let
+ (args, body2) = dig_for_valvars body
+ in
+ (v : args, body2)
+
+ dig_for_valvars body
+ = ASSERT(not (usage_lambda body))
+ ASSERT(not (tyvar_lambda body))
+ ([], body)
+
+ ---------------------------------------
+ usage_lambda (Lam (UsageBinder _) _) = True
+ usage_lambda _ = False
+
+ tyvar_lambda (Lam (TyBinder _) _) = True
+ tyvar_lambda _ = False
\end{code}
-@decomposeArgs@ just pulls of the contiguous TypeArg-then-ValArg block
-on the front of the args. Pretty common.
+%************************************************************************
+%* *
+\subsection{Core arguments (atoms)}
+%* *
+%************************************************************************
\begin{code}
-decomposeArgs :: [GenCoreArg bindee]
- -> ([Type], [GenCoreAtom bindee], [GenCoreArg bindee])
-
-decomposeArgs [] = ([],[],[])
+data GenCoreArg val_occ tyvar uvar
+ = LitArg Literal
+ | VarArg val_occ
+ | TyArg (GenType tyvar uvar)
+ | UsageArg (GenUsage uvar)
+\end{code}
-decomposeArgs (TypeArg ty : args)
- = case (decomposeArgs args) of { (tys, vals, rest) ->
- (ty:tys, vals, rest) }
+General and specific forms:
+\begin{code}
+mkGenApp :: GenCoreExpr val_bdr val_occ tyvar uvar
+ -> [GenCoreArg val_occ tyvar uvar]
+ -> GenCoreExpr val_bdr val_occ tyvar uvar
+mkTyApp :: GenCoreExpr val_bdr val_occ tyvar uvar
+ -> [GenType tyvar uvar]
+ -> GenCoreExpr val_bdr val_occ tyvar uvar
+mkUseApp :: GenCoreExpr val_bdr val_occ tyvar uvar
+ -> [GenUsage uvar]
+ -> GenCoreExpr val_bdr val_occ tyvar uvar
+mkValApp :: GenCoreExpr val_bdr val_occ tyvar uvar
+ -> [GenCoreArg val_occ tyvar uvar] -- but we ASSERT they are LitArg or VarArg
+ -> GenCoreExpr val_bdr val_occ tyvar uvar
+
+mkGenApp f args = foldl App f args
+mkTyApp f args = foldl (\ e a -> App e (TyArg a)) f args
+mkUseApp f args = foldl (\ e a -> App e (UsageArg a)) f args
+mkValApp f args = foldl (\ e a -> App e (is_Lit_or_Var a)) f args
+
+#ifndef DEBUG
+is_Lit_or_Var a = a
+#else
+is_Lit_or_Var a
+ = if isValArg a then a else panic "CoreSyn.mkValApps:not LitArg or VarArg"
+#endif
+
+isValArg (LitArg _) = True -- often used for sanity-checking
+isValArg (VarArg _) = True
+isValArg _ = False
+\end{code}
-decomposeArgs (ValArg val : args)
- = case (do_vals args) of { (vals, rest) ->
- ([], val:vals, rest) }
- where
- do_vals (ValArg val : args)
- = case (do_vals args) of { (vals, rest) ->
- (val:vals, rest) }
+\begin{code}
+mkApp fun = mk_thing (mkGenApp fun)
+mkCon con = mk_thing (Con con)
+mkPrim op = mk_thing (Prim op)
- do_vals args = ([], args)
+mk_thing thing uses tys vals
+ = thing (map UsageArg uses ++ map TyArg tys ++ map is_Lit_or_Var vals)
\end{code}
@collectArgs@ takes an application expression, returning the function
and the arguments to which it is applied.
\begin{code}
-collectArgs :: GenCoreExpr val_bdr bindee
- -> (GenCoreExpr val_bdr bindee, [GenCoreArg bindee])
+collectArgs :: GenCoreExpr val_bdr val_occ tyvar uvar
+ -> (GenCoreExpr val_bdr val_occ tyvar uvar,
+ [GenCoreArg val_occ tyvar uvar])
collectArgs expr
= collect expr []
where
- collect (App fun arg) args = collect fun (ValArg arg : args)
- collect (CoTyApp fun ty) args = collect fun (TypeArg ty : args)
- collect other_expr args = (other_expr, args)
+ collect (App fun arg) args = collect fun (arg : args)
+ collect fun args = (fun, args)
\end{code}
%************************************************************************
%* *
-\subsection[CoreSyn-output]{Instance declarations for output}
+\subsection{The main @Core*@ instantiation of the @GenCore*@ types}
%* *
%************************************************************************
-@pprCoreBinding@ and @pprCoreExpr@ let you give special printing
-function for ``major'' val_bdrs (those next to equal signs :-),
-``minor'' ones (lambda-bound, case-bound), and bindees. They would
-usually be called through some intermediary.
-
\begin{code}
-pprCoreBinding
- :: PprStyle
- -> (PprStyle -> bndr -> Pretty) -- to print "major" val_bdrs
- -> (PprStyle -> bndr -> Pretty) -- to print "minor" val_bdrs
- -> (PprStyle -> bdee -> Pretty) -- to print bindees
- -> GenCoreBinding bndr bdee
- -> Pretty
-
-pprCoreBinding sty pbdr1 pbdr2 pbdee (NonRec val_bdr expr)
- = ppHang (ppCat [pbdr1 sty val_bdr, ppEquals])
- 4 (pprCoreExpr sty pbdr1 pbdr2 pbdee expr)
-
-pprCoreBinding sty pbdr1 pbdr2 pbdee (Rec binds)
- = ppAboves [ifPprDebug sty (ppStr "{- Rec -}"),
- ppAboves (map ppr_bind binds),
- ifPprDebug sty (ppStr "{- end Rec -}")]
- where
- ppr_bind (val_bdr, expr)
- = ppHang (ppCat [pbdr1 sty val_bdr, ppEquals])
- 4 (pprCoreExpr sty pbdr1 pbdr2 pbdee expr)
-\end{code}
-
-\begin{code}
-instance (Outputable bndr, Outputable bdee)
- => Outputable (GenCoreBinding bndr bdee) where
- ppr sty bind = pprCoreBinding sty ppr ppr ppr bind
+type CoreBinding = GenCoreBinding Id Id TyVar UVar
+type CoreExpr = GenCoreExpr Id Id TyVar UVar
+type CoreBinder = GenCoreBinder Id TyVar UVar
+type CoreArg = GenCoreArg Id TyVar UVar
-instance (Outputable bndr, Outputable bdee)
- => Outputable (GenCoreExpr bndr bdee) where
- ppr sty expr = pprCoreExpr sty ppr ppr ppr expr
-
-instance Outputable bdee => Outputable (GenCoreAtom bdee) where
- ppr sty atom = pprCoreAtom sty ppr atom
+type CoreCaseAlts = GenCoreCaseAlts Id Id TyVar UVar
+type CoreCaseDefault = GenCoreCaseDefault Id Id TyVar UVar
\end{code}
-\begin{code}
-pprCoreAtom
- :: PprStyle
- -> (PprStyle -> bdee -> Pretty) -- to print bindees
- -> GenCoreAtom bdee
- -> Pretty
-
-pprCoreAtom sty pbdee (LitAtom lit) = ppr sty lit
-pprCoreAtom sty pbdee (VarAtom v) = pbdee sty v
-\end{code}
+%************************************************************************
+%* *
+\subsection{The @TaggedCore*@ instantiation of the @GenCore*@ types}
+%* *
+%************************************************************************
+Binders are ``tagged'' with a \tr{t}:
\begin{code}
-pprCoreExpr, pprParendCoreExpr
- :: PprStyle
- -> (PprStyle -> bndr -> Pretty) -- to print "major" val_bdrs
- -> (PprStyle -> bndr -> Pretty) -- to print "minor" val_bdrs
- -> (PprStyle -> bdee -> Pretty) -- to print bindees
- -> GenCoreExpr bndr bdee
- -> Pretty
-
-pprCoreExpr sty pbdr1 pbdr2 pbdee (Var name) = pbdee sty name
-
-pprCoreExpr sty pbdr1 pbdr2 pbdee (Lit literal) = ppr sty literal
-
-pprCoreExpr sty pbdr1 pbdr2 pbdee (Con con [] []) = ppr sty con
-
-pprCoreExpr sty pbdr1 pbdr2 pbdee (Con con types args)
- = ppHang (ppBesides [ppr sty con, ppChar '!'])
- 4 (ppSep ( (map (pprParendUniType sty) types)
- ++ (map (pprCoreAtom sty pbdee) args)))
-
-pprCoreExpr sty pbdr1 pbdr2 pbdee (Prim prim tys args)
- = ppHang (ppBesides [ppr sty prim, ppChar '!'])
- 4 (ppSep ( (map (pprParendUniType sty) tys)
- ++ (map (pprCoreAtom sty pbdee) args) ))
-
-pprCoreExpr sty pbdr1 pbdr2 pbdee (Lam val_bdr expr)
- = ppHang (ppCat [ppStr "\\", pbdr2 sty val_bdr, ppStr "->"])
- 4 (pprCoreExpr sty pbdr1 pbdr2 pbdee expr)
-
-pprCoreExpr sty pbdr1 pbdr2 pbdee (CoTyLam tyvar expr)
- = ppHang (ppCat [ppStr "/\\", interppSP sty (tyvar:tyvars),
- ppStr "->", pp_varss var_lists])
- 4 (pprCoreExpr sty pbdr1 pbdr2 pbdee expr_after)
- where
- (tyvars, var_lists, expr_after) = collect_tyvars expr
+type Tagged t = (Id, t)
- collect_tyvars (CoTyLam tyv e) = ( tyv:tyvs, vs, e_after )
- where (tyvs, vs, e_after) = collect_tyvars e
- collect_tyvars e@(Lam _ _) = ( [], vss, e_after )
- where (vss, e_after) = collect_vars e
- collect_tyvars other_e = ( [], [], other_e )
+type TaggedCoreBinding t = GenCoreBinding (Tagged t) Id TyVar UVar
+type TaggedCoreExpr t = GenCoreExpr (Tagged t) Id TyVar UVar
+type TaggedCoreBinder t = GenCoreBinder (Tagged t) TyVar UVar
+type TaggedCoreArg t = GenCoreArg Id TyVar UVar
- collect_vars (Lam var e) = ([var]:varss, e_after)
- where (varss, e_after) = collect_vars e
- collect_vars other_e = ( [], other_e )
-
- pp_varss [] = ppNil
- pp_varss (vars:varss)
- = ppCat [ppStr "\\", ppInterleave ppSP (map (pbdr2 sty) vars),
- ppStr "->", pp_varss varss]
-
-pprCoreExpr sty pbdr1 pbdr2 pbdee expr@(App fun_expr atom)
- = let
- (fun, args) = collect_args expr []
- in
- ppHang (pprParendCoreExpr sty pbdr1 pbdr2 pbdee fun)
- 4 (ppSep (map (pprCoreAtom sty pbdee) args))
- where
- collect_args (App fun arg) args = collect_args fun (arg:args)
- collect_args fun args = (fun, args)
-
-pprCoreExpr sty pbdr1 pbdr2 pbdee (CoTyApp expr ty)
- = ppHang (ppBeside pp_note (pprParendCoreExpr sty pbdr1 pbdr2 pbdee expr))
- 4 (pprParendUniType sty ty)
- where
- pp_note = ifPprShowAll sty (ppStr "{-CoTyApp-} ")
-
-pprCoreExpr sty pbdr1 pbdr2 pbdee (Case expr alts)
- = ppSep [ppSep [ppStr "case", ppNest 4 (pprParendCoreExpr sty pbdr1 pbdr2 pbdee expr),
- ppStr "of {"],
- ppNest 2 (pprCoreCaseAlts sty pbdr1 pbdr2 pbdee alts),
- ppStr "}"]
-
--- special cases: let ... in let ...
--- ("disgusting" SLPJ)
-
-pprCoreExpr sty pbdr1 pbdr2 pbdee (Let bind@(NonRec val_bdr rhs@(Let _ _)) body)
- = ppAboves [
- ppCat [ppStr "let {", pbdr1 sty val_bdr, ppEquals],
- ppNest 2 (pprCoreExpr sty pbdr1 pbdr2 pbdee rhs),
- ppStr "} in",
- pprCoreExpr sty pbdr1 pbdr2 pbdee body ]
-
-pprCoreExpr sty pbdr1 pbdr2 pbdee (Let bind@(NonRec val_bdr rhs) expr@(Let _ _))
- = ppAbove
- (ppHang (ppStr "let {")
- 2 (ppCat [ppHang (ppCat [pbdr1 sty val_bdr, ppEquals])
- 4 (pprCoreExpr sty pbdr1 pbdr2 pbdee rhs),
- ppStr "} in"]))
- (pprCoreExpr sty pbdr1 pbdr2 pbdee expr)
-
--- general case (recursive case, too)
-pprCoreExpr sty pbdr1 pbdr2 pbdee (Let bind expr)
- = ppSep [ppHang (ppStr "let {") 2 (pprCoreBinding sty pbdr1 pbdr2 pbdee bind),
- ppHang (ppStr "} in ") 2 (pprCoreExpr sty pbdr1 pbdr2 pbdee expr)]
-
-pprCoreExpr sty pbdr1 pbdr2 pbdee (SCC cc expr)
- = ppSep [ ppCat [ppStr "_scc_", ppStr (showCostCentre sty True{-as string-} cc)],
- pprParendCoreExpr sty pbdr1 pbdr2 pbdee expr ]
+type TaggedCoreCaseAlts t = GenCoreCaseAlts (Tagged t) Id TyVar UVar
+type TaggedCoreCaseDefault t = GenCoreCaseDefault (Tagged t) Id TyVar UVar
\end{code}
-\begin{code}
-pprParendCoreExpr sty pbdr1 pbdr2 pbdee e@(Var _) = pprCoreExpr sty pbdr1 pbdr2 pbdee e
-pprParendCoreExpr sty pbdr1 pbdr2 pbdee e@(Lit _) = pprCoreExpr sty pbdr1 pbdr2 pbdee e
-pprParendCoreExpr sty pbdr1 pbdr2 pbdee other_e
- = ppBesides [ppLparen, pprCoreExpr sty pbdr1 pbdr2 pbdee other_e, ppRparen]
-\end{code}
-
-\begin{code}
-instance (Outputable bndr, Outputable bdee)
- => Outputable (GenCoreCaseAlternatives bndr bdee) where
- ppr sty alts = pprCoreCaseAlts sty ppr ppr ppr alts
-\end{code}
+%************************************************************************
+%* *
+\subsection{The @SimplifiableCore*@ instantiation of the @GenCore*@ types}
+%* *
+%************************************************************************
+Binders are tagged with @BinderInfo@:
\begin{code}
-pprCoreCaseAlts
- :: PprStyle
- -> (PprStyle -> bndr -> Pretty) -- to print "major" val_bdrs
- -> (PprStyle -> bndr -> Pretty) -- to print "minor" val_bdrs
- -> (PprStyle -> bdee -> Pretty) -- to print bindees
- -> GenCoreCaseAlternatives bndr bdee
- -> Pretty
-
-pprCoreCaseAlts sty pbdr1 pbdr2 pbdee (AlgAlts alts deflt)
- = ppAboves [ ppAboves (map ppr_alt alts),
- pprCoreCaseDefault sty pbdr1 pbdr2 pbdee deflt ]
- where
- ppr_alt (con, params, expr)
- = ppHang (ppCat [ppr_con con,
- ppInterleave ppSP (map (pbdr2 sty) params),
- ppStr "->"])
- 4 (pprCoreExpr sty pbdr1 pbdr2 pbdee expr)
- where
- ppr_con con
- = if isOpLexeme con
- then ppBesides [ppLparen, ppr sty con, ppRparen]
- else ppr sty con
-
-pprCoreCaseAlts sty pbdr1 pbdr2 pbdee (PrimAlts alts deflt)
- = ppAboves [ ppAboves (map ppr_alt alts),
- pprCoreCaseDefault sty pbdr1 pbdr2 pbdee deflt ]
- where
- ppr_alt (lit, expr)
- = ppHang (ppCat [ppr sty lit, ppStr "->"])
- 4 (pprCoreExpr sty pbdr1 pbdr2 pbdee expr)
-\end{code}
+type Simplifiable = (Id, BinderInfo)
-\begin{code}
-instance (Outputable bndr, Outputable bdee)
- => Outputable (GenCoreCaseDefault bndr bdee) where
- ppr sty deflt = pprCoreCaseDefault sty ppr ppr ppr deflt
-\end{code}
+type SimplifiableCoreBinding = GenCoreBinding Simplifiable Id TyVar UVar
+type SimplifiableCoreExpr = GenCoreExpr Simplifiable Id TyVar UVar
+type SimplifiableCoreBinder = GenCoreBinder Simplifiable TyVar UVar
+type SimplifiableCoreArg = GenCoreArg Id TyVar UVar
-\begin{code}
-pprCoreCaseDefault
- :: PprStyle
- -> (PprStyle -> bndr -> Pretty) -- to print "major" val_bdrs
- -> (PprStyle -> bndr -> Pretty) -- to print "minor" val_bdrs
- -> (PprStyle -> bdee -> Pretty) -- to print bindees
- -> GenCoreCaseDefault bndr bdee
- -> Pretty
-
-pprCoreCaseDefault sty pbdr1 pbdr2 pbdee NoDefault = ppNil
-
-pprCoreCaseDefault sty pbdr1 pbdr2 pbdee (BindDefault val_bdr expr)
- = ppHang (ppCat [pbdr2 sty val_bdr, ppStr "->"])
- 4 (pprCoreExpr sty pbdr1 pbdr2 pbdee expr)
+type SimplifiableCoreCaseAlts = GenCoreCaseAlts Simplifiable Id TyVar UVar
+type SimplifiableCoreCaseDefault = GenCoreCaseDefault Simplifiable Id TyVar UVar
\end{code}
projects / ghc-hetmet.git / blobdiff