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