src/HaskWeakToCore.v

   1 (*********************************************************************************************************************************)
   2 (* HaskWeakToCore: convert HaskWeak to HaskCore                                                                                  *)
   3 (*********************************************************************************************************************************)
   4
   5 Generalizable All Variables.
   6 Require Import Preamble.
   7 Require Import General.
   8 Require Import Coq.Strings.String.
   9 Require Import Coq.Lists.List.
  10 Require Import HaskKinds.
  11 Require Import HaskLiteralsAndTyCons.
  12 Require Import HaskCoreVars.
  13 Require Import HaskCoreTypes.
  14 Require Import HaskCore.
  15 Require Import HaskWeakVars.
  16 Require Import HaskWeakTypes.
  17 Require Import HaskWeak.
  18 Require Import HaskCoreToWeak.
  19
  20 Variable mkCoreLet : @CoreBind CoreVar -> @CoreExpr CoreVar -> @CoreExpr CoreVar.
  21   Extract Inlined Constant mkCoreLet => "MkCore.mkCoreLet".
  22
  23 Variable sortAlts  : forall {a}{b}, list (@triple CoreAltCon a b) -> list (@triple CoreAltCon a b).
  24   Extract Inlined Constant sortAlts => "sortAlts".
  25   Implicit Arguments sortAlts [[a][b]].
  26
  27 Variable mkUnsafeCoercion : CoreType -> CoreType -> CoreCoercion.
  28     Extract Inlined Constant mkUnsafeCoercion => "Coercion.mkUnsafeCoercion".
  29
  30 (* Coercion and Type are actually the same thing in GHC, but we don't tell Coq about that.  This lets us get around it. *)
  31 Variable coreCoercionsAreReallyTypes : CoreCoercion -> CoreType.
  32   Extract Inlined Constant coreCoercionsAreReallyTypes => "(\x -> x)".
  33
  34 Variable ModalBoxTyCon   : TyCon.        Extract Inlined Constant ModalBoxTyCon => "TysWiredIn.hetMetCodeTypeTyCon".
  35 Variable ArrowTyCon      : TyCon.        Extract Constant ArrowTyCon    => "Type.funTyCon".
  36
  37 Definition weakAltConToCoreAltCon (wa:WeakAltCon) : CoreAltCon :=
  38   match wa with
  39   | WeakDataAlt cdc => DataAlt cdc
  40   | WeakLitAlt  lit => LitAlt lit
  41   | WeakDEFAULT     => DEFAULT
  42   end.
  43
  44 Fixpoint weakTypeToCoreType (wt:WeakType) : CoreType :=
  45   match wt with
  46     | WTyVarTy  (weakTypeVar v _)     => TyVarTy v
  47     | WAppTy (WAppTy WFunTyCon t1) t2 => FunTy (weakTypeToCoreType t1) (weakTypeToCoreType t2)
  48     | WAppTy  t1 t2                   => match (weakTypeToCoreType t1) with
  49                                            | TyConApp tc tys => TyConApp tc (app tys ((weakTypeToCoreType t2)::nil))
  50                                            | t1'             => AppTy t1' (weakTypeToCoreType t2)
  51                                          end
  52     | WTyCon    tc                    => TyConApp tc nil
  53     | WTyFunApp tf lt                 => TyConApp tf (map weakTypeToCoreType lt)
  54     | WClassP c lt                    => PredTy (ClassP c (map weakTypeToCoreType lt))
  55     | WIParam n ty                    => PredTy (IParam n (weakTypeToCoreType ty))
  56     | WForAllTy (weakTypeVar wtv _) t => ForAllTy wtv (weakTypeToCoreType t)
  57     | WFunTyCon                       => TyConApp ArrowTyCon nil
  58     | WCodeTy  (weakTypeVar ec _) t   => TyConApp ModalBoxTyCon ((TyVarTy ec)::(weakTypeToCoreType t)::nil)
  59     | WCoFunTy t1 t2 t3               => FunTy (PredTy (EqPred (weakTypeToCoreType t1) (weakTypeToCoreType t2)))
  60                                             (weakTypeToCoreType t3)
  61   end.
  62
  63 Definition weakCoercionToCoreCoercion (wc:WeakCoercion) : CoreCoercion :=
  64   mkUnsafeCoercion (weakTypeToCoreType (fst (weakCoercionTypes wc))) (weakTypeToCoreType (snd (weakCoercionTypes wc))).
  65
  66 Fixpoint weakExprToCoreExpr (me:WeakExpr) : @CoreExpr CoreVar :=
  67   match me with
  68   | WEVar   (weakExprVar v _)            => CoreEVar  v
  69   | WELit   lit                          => CoreELit  lit
  70   | WEApp   e1 e2                        => CoreEApp     (weakExprToCoreExpr e1) (weakExprToCoreExpr e2)
  71   | WETyApp e t                          => CoreEApp     (weakExprToCoreExpr e ) (CoreEType (weakTypeToCoreType t))
  72   | WECoApp e co                         => CoreEApp     (weakExprToCoreExpr e )
  73                                                            (CoreEType (coreCoercionsAreReallyTypes (weakCoercionToCoreCoercion co)))
  74   | WENote  n e                          => CoreENote n  (weakExprToCoreExpr e )
  75   | WELam   (weakExprVar ev _  ) e       => CoreELam  ev (weakExprToCoreExpr e )
  76   | WETyLam (weakTypeVar tv _  ) e       => CoreELam  tv (weakExprToCoreExpr e )
  77   | WECoLam (weakCoerVar cv _ _ _) e     => CoreELam  cv (weakExprToCoreExpr e )
  78   | WECast  e co                         => CoreECast    (weakExprToCoreExpr e ) (weakCoercionToCoreCoercion co)
  79   | WEBrak  v (weakTypeVar ec _) e t     => fold_left CoreEApp
  80                                                    ((CoreEType (TyVarTy ec))::
  81                                                      (CoreEType (weakTypeToCoreType t))::
  82                                                      (weakExprToCoreExpr e)::
  83                                                      nil)
  84                                                    (CoreEVar v)
  85   | WEEsc   v (weakTypeVar ec _) e t     => fold_left CoreEApp
  86                                                    ((CoreEType (TyVarTy ec))::
  87                                                      (CoreEType (weakTypeToCoreType t))::
  88                                                      (weakExprToCoreExpr e)::
  89                                                      nil)
  90                                                    (CoreEVar v)
  91   | WECSP   v (weakTypeVar ec _) e t     => fold_left CoreEApp
  92                                                    ((CoreEType (TyVarTy ec))::
  93                                                      (CoreEType (weakTypeToCoreType t))::
  94                                                      (weakExprToCoreExpr e)::
  95                                                      nil)
  96                                                    (CoreEVar v)
  97   | WELet   (weakExprVar v _) ve e       => mkCoreLet      (CoreNonRec v (weakExprToCoreExpr ve))  (weakExprToCoreExpr e)
  98   | WECase  vscrut e tbranches tc types alts  =>
  99                                             CoreECase (weakExprToCoreExpr e) vscrut (weakTypeToCoreType tbranches)
 100                                               (sortAlts ((
 101                                                 fix mkCaseBranches (alts:Tree
 102                                                   ??(WeakAltCon*list WeakTypeVar*list WeakCoerVar*list WeakExprVar*WeakExpr)) :=
 103                                                 match alts with
 104                                                   | T_Leaf None              => nil
 105                                                   | T_Branch b1 b2           => app (mkCaseBranches b1) (mkCaseBranches b2)
 106                                                   | T_Leaf (Some (ac,tvars,cvars,evars,e)) =>
 107                                                     (mkTriple (weakAltConToCoreAltCon ac)
 108                                                       (app (app
 109                                                         (map (fun v:WeakTypeVar => weakVarToCoreVar v) tvars)
 110                                                         (map (fun v:WeakCoerVar => weakVarToCoreVar v) cvars))
 111                                                       (map (fun v:WeakExprVar => weakVarToCoreVar v) evars))
 112                                                       (weakExprToCoreExpr e))::nil
 113                                                 end
 114                                               ) alts))
 115   | WELetRec mlr e                       => CoreELet (CoreRec
 116                                                ((fix mkLetBindings (mlr:Tree ??(WeakExprVar * WeakExpr)) :=
 117                                                  match mlr with
 118                                                    | T_Leaf None                        => nil
 119                                                    | T_Leaf (Some (weakExprVar cv _,e)) => (cv,(weakExprToCoreExpr e))::nil
 120                                                    | T_Branch b1 b2                     => app (mkLetBindings b1) (mkLetBindings b2)
 121                                                  end) mlr))
 122                                                (weakExprToCoreExpr e)
 123   end.
 124
 125 Definition weakTypeOfWeakExpr (we:WeakExpr) : ???WeakType :=
 126   coreTypeToWeakType (coreTypeOfCoreExpr (weakExprToCoreExpr we)).
 127
 128 Instance weakExprToString : ToString WeakExpr  :=
 129   { toString := fun we => toString (weakExprToCoreExpr we) }.
 130
 131