X-Git-Url: http://git.megacz.com/?p=coq-hetmet.git;a=blobdiff_plain;f=src%2FHaskCoreToWeak.v;h=7669e5d4593322b490a053af94e1b30b1ced044c;hp=6fc5b431ea1cdee2c9e15b70bf05d5ba4cad4fa6;hb=5cb97fa6ed28f55ca888bdadc4f145396cc02236;hpb=26733c04106397dc8a10396ce688e908e8d0cde7 diff --git a/src/HaskCoreToWeak.v b/src/HaskCoreToWeak.v index 6fc5b43..7669e5d 100644 --- a/src/HaskCoreToWeak.v +++ b/src/HaskCoreToWeak.v @@ -4,10 +4,11 @@ Generalizable All Variables. Require Import Preamble. -Require Import General. Require Import Coq.Lists.List. +Require Import General. Require Import HaskKinds. -Require Import HaskCoreLiterals. +Require Import HaskLiterals. +Require Import HaskTyCons. Require Import HaskCoreVars. Require Import HaskCoreTypes. Require Import HaskCore. @@ -15,15 +16,35 @@ Require Import HaskWeakVars. Require Import HaskWeakTypes. Require Import HaskWeak. -Axiom tycons_distinct : ~(ArrowTyCon=ModalBoxTyCon). -Variable tyConOrTyFun : CoreTyCon -> sum TyCon TyFun. Extract Inlined Constant tyConOrTyFun => "tyConOrTyFun". +Variable tyConOrTyFun : CoreTyCon -> sum TyCon TyFun. Extract Inlined Constant tyConOrTyFun => "tyConOrTyFun". +Variable coreViewDeep : CoreType -> CoreType. Extract Inlined Constant coreViewDeep => "coreViewDeep". +Variable coercionKind : CoreCoercion -> (CoreType * CoreType). + Extract Inlined Constant coercionKind => "(\x -> Pair.unPair (Coercion.coercionKind x))". + +(* extracts the Name from a CoreVar *) +Variable coreVarCoreName : CoreVar -> CoreName. Extract Inlined Constant coreVarCoreName => "Var.varName". + +(* the magic wired-in name for the modal type introduction/elimination forms *) +Variable hetmet_brak_name : CoreName. Extract Inlined Constant hetmet_brak_name => "PrelNames.hetmet_brak_name". +Variable hetmet_esc_name : CoreName. Extract Inlined Constant hetmet_esc_name => "PrelNames.hetmet_esc_name". +Variable hetmet_csp_name : CoreName. Extract Inlined Constant hetmet_csp_name => "PrelNames.hetmet_csp_name". + +Definition mkTyFunApplication (tf:TyFun)(lwt:list WeakType) : ???WeakType := + split_list lwt (length (fst (tyFunKind tf))) >>= + fun argsrest => + let (args,rest) := argsrest in + OK (fold_left (fun x y => WAppTy x y) rest (WTyFunApp tf args)). + +(* a hack to evade the guardedness check of Fixpoint *) +Variable coreTypeToWeakTypeCheat' : CoreType -> ???WeakType. +Extract Inlined Constant coreTypeToWeakTypeCheat' => "coreTypeToWeakType'". Fixpoint coreTypeToWeakType' (ct:CoreType) : ???WeakType := match ct with | TyVarTy cv => match coreVarToWeakVar cv with - | WExprVar _ => Error "encountered expression variable in a type" - | WTypeVar tv => OK (WTyVarTy tv) - | WCoerVar _ => Error "encountered coercion variable in a type" + | CVTWVR_EVar ct => Error "encountered expression variable in a type" + | CVTWVR_TyVar k => OK (WTyVarTy (weakTypeVar cv k)) + | CVTWVR_CoVar t1 t2 => Error "encountered coercion variable in a type" end | AppTy t1 t2 => coreTypeToWeakType' t2 >>= fun t2' => coreTypeToWeakType' t1 >>= fun t1' => OK (WAppTy t1' t2') @@ -34,16 +55,17 @@ Fixpoint coreTypeToWeakType' (ct:CoreType) : ???WeakType := | a::b => coreTypeToWeakType' a >>= fun a' => rec b >>= fun b' => OK (a'::b') end) lct) in match tyConOrTyFun tc_ with - | inr tf => recurse >>= fun recurse' => OK (WTyFunApp tf recurse') + | inr tf => recurse >>= fun recurse' => mkTyFunApplication tf recurse' | inl tc => if eqd_dec tc ModalBoxTyCon then match lct with | ((TyVarTy ec)::tbody::nil) => match coreVarToWeakVar ec with - | WTypeVar ec' => coreTypeToWeakType' tbody >>= fun tbody' => OK (WCodeTy ec' tbody') - | WExprVar _ => Error "encountered expression variable in a modal box type" - | WCoerVar _ => Error "encountered coercion variable in a modal box type" + | CVTWVR_EVar ct => Error "encountered expression variable in a modal box type" + | CVTWVR_CoVar t1 t2 => Error "encountered coercion variable in a modal box type" + | CVTWVR_TyVar k => coreTypeToWeakType' tbody >>= fun tbody' => + OK (WCodeTy (weakTypeVar ec k) tbody') end - | _ => Error "mis-applied modal box tycon" + | _ => Error ("mis-applied modal box tycon: " +++ toString ct) end else let tc' := if eqd_dec tc ArrowTyCon then WFunTyCon @@ -58,9 +80,12 @@ Fixpoint coreTypeToWeakType' (ct:CoreType) : ???WeakType := coreTypeToWeakType' t2 >>= fun t2' => OK (WAppTy (WAppTy WFunTyCon t1') t2') | ForAllTy cv t => match coreVarToWeakVar cv with - | WExprVar _ => Error "encountered expression variable in a type" - | WTypeVar tv => coreTypeToWeakType' t >>= fun t' => OK (WForAllTy tv t') - | WCoerVar _ => Error "encountered coercion variable in a type" + | CVTWVR_EVar ct => Error "encountered expression variable in a type abstraction" + | CVTWVR_TyVar k => coreTypeToWeakType' t >>= fun t' => OK (WForAllTy (weakTypeVar cv k) t') + | CVTWVR_CoVar t1 t2 => coreTypeToWeakTypeCheat' t1 >>= fun t1' => + coreTypeToWeakTypeCheat' t2 >>= fun t2' => + coreTypeToWeakType' t >>= fun t3' => + OK (WCoFunTy t1' t2' t3') end | PredTy (ClassP cl lct) => ((fix rec tl := match tl with | nil => OK nil @@ -71,49 +96,106 @@ Fixpoint coreTypeToWeakType' (ct:CoreType) : ???WeakType := | PredTy (EqPred _ _) => Error "hit a bare EqPred" end. -Variable coreViewDeep : CoreType -> CoreType. Extract Inlined Constant coreViewDeep => "coreViewDeep". -Definition coreTypeToWeakType t := coreTypeToWeakType' (coreViewDeep t). +Definition coreTypeToWeakType t := + addErrorMessage ("during coreTypeToWeakType on " +++ toString t +++ eol) (coreTypeToWeakType' (coreViewDeep t)). + +Definition coreVarToWeakVar' (cv:CoreVar) : ???WeakVar := + addErrorMessage ("during coreVarToWeakVar on " +++ toString cv +++ eol) + match coreVarToWeakVar cv with + | CVTWVR_EVar ct => coreTypeToWeakType ct >>= fun t' => OK (WExprVar (weakExprVar cv t')) + | CVTWVR_TyVar k => OK (WTypeVar (weakTypeVar cv k)) + | CVTWVR_CoVar t1 t2 => + (* this will choke if given a coercion-between-coercions (EqPred (EqPred c1 c2) (EqPred c3 c4)) *) + addErrorMessage ("with t2=" +++ toString t2 +++ eol) + ((coreTypeToWeakType t2) >>= fun t2' => + addErrorMessage ("with t1=" +++ toString t1 +++ eol) + (coreTypeToWeakType t1) >>= fun t1' => + OK (WCoerVar (weakCoerVar cv t1' t2'))) + end. +Definition tyConTyVars (tc:CoreTyCon) := + filter (map (fun x => match coreVarToWeakVar' x with OK (WTypeVar v) => Some v | _ => None end) (getTyConTyVars_ tc)). + Opaque tyConTyVars. +Definition tyConKind (tc:TyCon) : list Kind := map (fun (x:WeakTypeVar) => x:Kind) (tyConTyVars tc). (* detects our crude Core-encoding of modal type introduction/elimination forms *) -Definition isBrak (ce:@CoreExpr CoreVar) : ??(CoreVar * WeakTypeVar * CoreType) := +Definition isBrak (ce:@CoreExpr CoreVar) : ??(WeakExprVar * WeakTypeVar * CoreType) := match ce with | (CoreEApp (CoreEApp (CoreEVar v) (CoreEType (TyVarTy ec))) (CoreEType tbody)) => if coreName_eq hetmet_brak_name (coreVarCoreName v) then - match coreVarToWeakVar ec with - | WExprVar _ => None - | WTypeVar tv => Some (v,tv,tbody) - | WCoerVar _ => None + match coreVarToWeakVar' ec with + | OK (WTypeVar tv) => match coreVarToWeakVar' v with + | OK (WExprVar v') => Some (v',tv,tbody) + | _ => None + end + | _ => None end else None | _ => None end. -Definition isEsc (ce:@CoreExpr CoreVar) : ??(CoreVar * WeakTypeVar * CoreType) := + +Definition isEsc (ce:@CoreExpr CoreVar) : ??(WeakExprVar * WeakTypeVar * CoreType) := match ce with | (CoreEApp (CoreEApp (CoreEVar v) (CoreEType (TyVarTy ec))) (CoreEType tbody)) => if coreName_eq hetmet_esc_name (coreVarCoreName v) then - match coreVarToWeakVar ec with - | WExprVar _ => None - | WTypeVar tv => Some (v,tv,tbody) - | WCoerVar _ => None + match coreVarToWeakVar' ec with + | OK (WTypeVar tv) => match coreVarToWeakVar' v with + | OK (WExprVar v') => Some (v',tv,tbody) + | _ => None + end + | _ => None + end else None + | _ => None +end. + +Definition isCSP (ce:@CoreExpr CoreVar) : ??(WeakExprVar * WeakTypeVar * CoreType) := +match ce with + | (CoreEApp (CoreEApp (CoreEVar v) (CoreEType (TyVarTy ec))) (CoreEType tbody)) + => if coreName_eq hetmet_csp_name (coreVarCoreName v) then + match coreVarToWeakVar' ec with + | OK (WTypeVar tv) => match coreVarToWeakVar' v with + | OK (WExprVar v') => Some (v',tv,tbody) + | _ => None + end + | _ => None end else None | _ => None end. -Definition coreCoercionToWeakCoercion (cc:CoreCoercion) : ???WeakCoercion := - let (t1,t2) := coreCoercionKind cc - in coreTypeToWeakType t1 >>= fun t1' => - coreTypeToWeakType t2 >>= fun t2' => - OK (weakCoercion (kindOfCoreType t1) t1' t2' cc). +(* if this is a (WAppTy (WAppTy ... (WTyCon tc) .. ) .. ), return (tc,[...]) *) +Fixpoint expectTyConApp (wt:WeakType)(acc:list WeakType) : ???(TyCon * list WeakType) := + match wt with + | WTyCon tc => OK (tc,acc) + | WAppTy t1 t2 => expectTyConApp t1 (t2::acc) + | WTyFunApp tc tys => Error ("expectTyConApp encountered TyFunApp: " +++ toString wt) + | _ => Error ("expectTyConApp encountered " +++ toString wt) + end. + +(* expects to see an EType with a coercion payload *) +Definition coreExprToWeakCoercion t1 t2 (ce:@CoreExpr CoreVar) : ???WeakCoercion := + match ce with + | CoreEType t => (*OK (coreCoercionToWeakCoercion t)*) OK (WCoUnsafe t1 t2) + | _ => Error ("coreExprToWeakCoercion got a " +++ toString ce) + end. + +(* expects to see an EType *) +Definition coreExprToWeakType (ce:@CoreExpr CoreVar) : ???WeakType := + match ce with + | CoreEType t => coreTypeToWeakType t + | _ => Error ("coreExprToWeakType got a " +++ toString ce) + end. Fixpoint coreExprToWeakExpr (ce:@CoreExpr CoreVar) : ???WeakExpr := match ce with | CoreELit lit => OK (WELit lit) | CoreENote n e => coreExprToWeakExpr e >>= fun e' => OK (WENote n e') | CoreEType t => Error "encountered CoreEType in a position where an Expr should have been" + | CoreECoercion co => Error "encountered CoreECoercion in a position where an Expr should have been" | CoreECast e co => coreExprToWeakExpr e >>= fun e' => - coreCoercionToWeakCoercion co >>= fun co' => - OK (WECast e' co') + let (ct1,ct2) := coercionKind co + in coreTypeToWeakType ct1 >>= fun t1 => + coreTypeToWeakType ct2 >>= fun t2 => + OK (WECast e' (WCoUnsafe t1 t2)) - | CoreEVar v => match coreVarToWeakVar v with + | CoreEVar v => coreVarToWeakVar' v >>= fun v' => match v' with | WExprVar ev => OK (WEVar ev) | WTypeVar _ => Error "found a type variable inside an EVar!" | WCoerVar _ => Error "found a coercion variable inside an EVar!" @@ -129,30 +211,42 @@ Fixpoint coreExprToWeakExpr (ce:@CoreExpr CoreVar) : ???WeakExpr := coreExprToWeakExpr e2 >>= fun e' => coreTypeToWeakType t >>= fun t' => OK (WEEsc v tv e' t') - | None => coreExprToWeakExpr e1 >>= fun e1' => - match e2 with - | CoreEType t => - coreTypeToWeakType t >>= fun t' => - OK (WETyApp e1' t') - | _ => coreExprToWeakExpr e2 >>= fun e2' => OK (WEApp e1' e2') - end + | None => match isCSP e1 with + | Some (v,tv,t) => + coreExprToWeakExpr e2 >>= fun e' => + coreTypeToWeakType t >>= fun t' => + OK (WECSP v tv e' t') + | None => coreExprToWeakExpr e1 >>= fun e1' => + match e2 with + | CoreEType t => + coreTypeToWeakType t >>= fun t' => + OK (WETyApp e1' t') + | _ => coreExprToWeakExpr e2 + >>= fun e2' => OK (WEApp e1' e2') + end + end end end - | CoreELam v e => match coreVarToWeakVar v with + | CoreELam v e => coreVarToWeakVar' v >>= fun v' => match v' with | WExprVar ev => coreExprToWeakExpr e >>= fun e' => OK (WELam ev e') | WTypeVar tv => coreExprToWeakExpr e >>= fun e' => OK (WETyLam tv e') | WCoerVar cv => coreExprToWeakExpr e >>= fun e' => OK (WECoLam cv e') end - | CoreELet (CoreNonRec v ve) e => match coreVarToWeakVar v with + | CoreELet (CoreNonRec v ve) e => coreVarToWeakVar' v >>= fun v' => match v' with | WExprVar ev => coreExprToWeakExpr ve >>= fun ve' => coreExprToWeakExpr e >>= fun e' => OK (WELet ev ve' e') - | WTypeVar _ => match e with - | CoreEType t => Error "saw a type-let" + | WTypeVar tv => match e with + | CoreEType t => coreExprToWeakExpr e >>= fun e' => + coreExprToWeakType ve >>= fun ty' => + OK (WETyApp (WETyLam tv e') ty') | _ => Error "saw (ELet e) where e!=EType" end - | WCoerVar _ => Error "saw an (ELet )" + | WCoerVar (weakCoerVar cv t1 t2) => + coreExprToWeakExpr e >>= fun e' => + coreExprToWeakCoercion t1 t2 ve >>= fun co' => + OK (WECoApp (WECoLam (weakCoerVar cv t1 t2) e') co') end | CoreELet (CoreRec rb) e => @@ -160,7 +254,7 @@ Fixpoint coreExprToWeakExpr (ce:@CoreExpr CoreVar) : ???WeakExpr := match cel with | nil => OK nil | (v',e')::t => coreExprToWeakExprList t >>= fun t' => - match coreVarToWeakVar v' with + coreVarToWeakVar' v' >>= fun v'' => match v'' with | WExprVar ev => coreExprToWeakExpr e' >>= fun e' => OK ((ev,e')::t') | WTypeVar _ => Error "found a type variable in a recursive let" | WCoerVar _ => Error "found a coercion variable in a recursive let" @@ -170,37 +264,34 @@ Fixpoint coreExprToWeakExpr (ce:@CoreExpr CoreVar) : ???WeakExpr := OK (WELetRec (unleaves' rb') e') | CoreECase e v tbranches alts => - match coreVarToWeakVar v with + coreVarToWeakVar' v >>= fun v' => match v' with | WTypeVar _ => Error "found a type variable in a case" | WCoerVar _ => Error "found a coercion variable in a case" | WExprVar ev => - coreExprToWeakExpr e >>= fun e' => - weakTypeOfWeakExpr e' >>= fun te' => - (match isTyConApp te' nil with None => Error "expectTyConApp encountered strange type" | Some x => OK x end) - >>= fun tca => - let (tc,lt) := tca in - ((fix mkBranches (branches: list (@triple AltCon (list CoreVar) (@CoreExpr CoreVar))) - : ???(list (AltCon*list WeakTypeVar*list WeakCoerVar*list WeakExprVar*WeakExpr)) := + coreTypeToWeakType (coreTypeOfCoreExpr e) >>= fun te' => + expectTyConApp te' nil >>= fun tca => + let (tc,lt) := tca:(TyCon * list WeakType) in + ((fix mkBranches (branches: list (@triple CoreAltCon (list CoreVar) (@CoreExpr CoreVar))) + : ???(list (WeakAltCon*list WeakTypeVar*list WeakCoerVar*list WeakExprVar*WeakExpr)) := match branches with | nil => OK nil | (mkTriple alt vars e)::rest => mkBranches rest >>= fun rest' => coreExprToWeakExpr e >>= fun e' => match alt with - | DEFAULT => OK ((DEFAULT,nil,nil,nil,e')::rest') - | LitAlt lit => OK ((LitAlt lit,nil,nil,nil,e')::rest') - | DataAlt dc => let vars := map coreVarToWeakVar vars in - OK (((DataAlt dc), - (General.filter (map (fun x => match x with WTypeVar v => Some v | _ => None end) vars)), - (General.filter (map (fun x => match x with WCoerVar v => Some v | _ => None end) vars)), - (General.filter (map (fun x => match x with WExprVar v => Some v | _ => None end) vars)), + | DEFAULT => OK ((WeakDEFAULT,nil,nil,nil,e')::rest') + | LitAlt lit => OK ((WeakLitAlt lit,nil,nil,nil,e')::rest') + | DataAlt dc => let vars := map coreVarToWeakVar' vars in + OK (((WeakDataAlt dc), + (filter (map (fun x => match x with OK (WTypeVar v) => Some v | _ => None end) vars)), + (filter (map (fun x => match x with OK (WCoerVar v) => Some v | _ => None end) vars)), + (filter (map (fun x => match x with OK (WExprVar v) => Some v | _ => None end) vars)), e')::rest') end end) alts) >>= fun branches => coreExprToWeakExpr e >>= fun scrutinee => coreTypeToWeakType tbranches >>= fun tbranches' => - OK (WELet ev scrutinee (WECase (WEVar ev) tbranches' tc lt (unleaves branches))) + OK (WECase ev scrutinee tbranches' tc lt (unleaves branches)) end end. -