1 (*********************************************************************************************************************************)
2 (* HaskCoreToWeak: convert HaskCore to HaskWeak *)
3 (*********************************************************************************************************************************)
5 Generalizable All Variables.
6 Require Import Preamble.
7 Require Import Coq.Lists.List.
8 Require Import General.
9 Require Import HaskKinds.
10 Require Import HaskLiterals.
11 Require Import HaskTyCons.
12 Require Import HaskCoreVars.
13 Require Import HaskCoreTypes.
14 Require Import HaskCore.
15 Require Import HaskWeakVars.
16 Require Import HaskWeakTypes.
17 Require Import HaskWeak.
19 Variable tyConOrTyFun : CoreTyCon -> sum TyCon TyFun. Extract Inlined Constant tyConOrTyFun => "tyConOrTyFun".
20 Variable coreViewDeep : CoreType -> CoreType. Extract Inlined Constant coreViewDeep => "coreViewDeep".
21 Variable coreCoercionToWeakCoercion : CoreCoercion -> WeakCoercion.
22 Extract Inlined Constant coreCoercionToWeakCoercion => "coreCoercionToWeakCoercion".
24 (* extracts the Name from a CoreVar *)
25 Variable coreVarCoreName : CoreVar -> CoreName. Extract Inlined Constant coreVarCoreName => "Var.varName".
27 (* the magic wired-in name for the modal type introduction/elimination forms *)
28 Variable hetmet_brak_name : CoreName. Extract Inlined Constant hetmet_brak_name => "PrelNames.hetmet_brak_name".
29 Variable hetmet_esc_name : CoreName. Extract Inlined Constant hetmet_esc_name => "PrelNames.hetmet_esc_name".
30 Variable hetmet_csp_name : CoreName. Extract Inlined Constant hetmet_csp_name => "PrelNames.hetmet_csp_name".
32 Fixpoint coreTypeToWeakType' (ct:CoreType) : ???WeakType :=
34 | TyVarTy cv => match coreVarToWeakVar cv with
35 | WExprVar _ => Error "encountered expression variable in a type"
36 | WTypeVar tv => OK (WTyVarTy tv)
37 | WCoerVar _ => Error "encountered coercion variable in a type"
40 | AppTy t1 t2 => coreTypeToWeakType' t2 >>= fun t2' => coreTypeToWeakType' t1 >>= fun t1' => OK (WAppTy t1' t2')
43 let recurse := ((fix rec tl := match tl with
45 | a::b => coreTypeToWeakType' a >>= fun a' => rec b >>= fun b' => OK (a'::b')
47 in match tyConOrTyFun tc_ with
48 | inr tf => recurse >>= fun recurse' => OK (WTyFunApp tf recurse')
49 | inl tc => if eqd_dec tc ModalBoxTyCon
51 | ((TyVarTy ec)::tbody::nil) =>
52 match coreVarToWeakVar ec with
53 | WTypeVar ec' => coreTypeToWeakType' tbody >>= fun tbody' => OK (WCodeTy ec' tbody')
54 | WExprVar _ => Error "encountered expression variable in a modal box type"
55 | WCoerVar _ => Error "encountered coercion variable in a modal box type"
57 | _ => Error ("mis-applied modal box tycon: " +++ toString ct)
59 else let tc' := if eqd_dec tc ArrowTyCon
62 in recurse >>= fun recurse' => OK (fold_left (fun x y => WAppTy x y) recurse' tc')
64 | FunTy (PredTy (EqPred t1 t2)) t3 => coreTypeToWeakType' t1 >>= fun t1' =>
65 coreTypeToWeakType' t2 >>= fun t2' =>
66 coreTypeToWeakType' t3 >>= fun t3' =>
67 OK (WCoFunTy t1' t2' t3')
68 | FunTy t1 t2 => coreTypeToWeakType' t1 >>= fun t1' =>
69 coreTypeToWeakType' t2 >>= fun t2' =>
70 OK (WAppTy (WAppTy WFunTyCon t1') t2')
71 | ForAllTy cv t => match coreVarToWeakVar cv with
72 | WExprVar _ => Error "encountered expression variable in a type abstraction"
73 | WTypeVar tv => coreTypeToWeakType' t >>= fun t' => OK (WForAllTy tv t')
74 | WCoerVar (weakCoerVar v t1' t2') =>
75 coreTypeToWeakType' t >>= fun t3' =>
76 OK (WCoFunTy t1' t2' t3')
78 | PredTy (ClassP cl lct) => ((fix rec tl := match tl with
80 | a::b => coreTypeToWeakType' a >>= fun a' =>
81 rec b >>= fun b' => OK (a'::b')
82 end) lct) >>= fun lct' => OK (WClassP cl lct')
83 | PredTy (IParam ipn ct) => coreTypeToWeakType' ct >>= fun ct' => OK (WIParam ipn ct')
84 | PredTy (EqPred _ _) => Error "hit a bare EqPred"
87 Definition coreTypeToWeakType t :=
88 addErrorMessage ("during coreTypeToWeakType on " +++ toString t +++ eol) (coreTypeToWeakType' (coreViewDeep t)).
90 (* detects our crude Core-encoding of modal type introduction/elimination forms *)
91 Definition isBrak (ce:@CoreExpr CoreVar) : ??(WeakExprVar * WeakTypeVar * CoreType) :=
93 | (CoreEApp (CoreEApp (CoreEVar v) (CoreEType (TyVarTy ec))) (CoreEType tbody))
94 => if coreName_eq hetmet_brak_name (coreVarCoreName v) then
95 match coreVarToWeakVar ec with
98 | WTypeVar tv => match coreVarToWeakVar v with
99 | WExprVar v' => Some (v',tv,tbody)
106 Definition isEsc (ce:@CoreExpr CoreVar) : ??(WeakExprVar * WeakTypeVar * CoreType) :=
108 | (CoreEApp (CoreEApp (CoreEVar v) (CoreEType (TyVarTy ec))) (CoreEType tbody))
109 => if coreName_eq hetmet_esc_name (coreVarCoreName v) then
110 match coreVarToWeakVar ec with
112 | WTypeVar tv => match coreVarToWeakVar v with
113 | WExprVar v' => Some (v',tv,tbody)
121 Definition isCSP (ce:@CoreExpr CoreVar) : ??(WeakExprVar * WeakTypeVar * CoreType) :=
123 | (CoreEApp (CoreEApp (CoreEVar v) (CoreEType (TyVarTy ec))) (CoreEType tbody))
124 => if coreName_eq hetmet_csp_name (coreVarCoreName v) then
125 match coreVarToWeakVar ec with
127 | WTypeVar tv => match coreVarToWeakVar v with
128 | WExprVar v' => Some (v',tv,tbody)
136 (* if this is a (WAppTy (WAppTy ... (WTyCon tc) .. ) .. ), return (tc,[...]) *)
137 Fixpoint expectTyConApp (wt:WeakType)(acc:list WeakType) : ???(TyCon * list WeakType) :=
139 | WTyCon tc => OK (tc,acc)
140 | WAppTy t1 t2 => expectTyConApp t1 (t2::acc)
141 | WTyFunApp tc tys => Error ("expectTyConApp encountered TyFunApp: " +++ toString wt)
142 | _ => Error ("expectTyConApp encountered " +++ toString wt)
145 Fixpoint coreExprToWeakExpr (ce:@CoreExpr CoreVar) : ???WeakExpr :=
147 | CoreELit lit => OK (WELit lit)
148 | CoreENote n e => coreExprToWeakExpr e >>= fun e' => OK (WENote n e')
149 | CoreEType t => Error "encountered CoreEType in a position where an Expr should have been"
150 | CoreECast e co => coreExprToWeakExpr e >>= fun e' =>
151 OK (WECast e' (coreCoercionToWeakCoercion co))
153 | CoreEVar v => match coreVarToWeakVar v with
154 | WExprVar ev => OK (WEVar ev)
155 | WTypeVar _ => Error "found a type variable inside an EVar!"
156 | WCoerVar _ => Error "found a coercion variable inside an EVar!"
159 | CoreEApp e1 e2 => match isBrak e1 with
161 coreExprToWeakExpr e2 >>= fun e' =>
162 coreTypeToWeakType t >>= fun t' =>
163 OK (WEBrak v tv e' t')
164 | None => match isEsc e1 with
166 coreExprToWeakExpr e2 >>= fun e' =>
167 coreTypeToWeakType t >>= fun t' =>
168 OK (WEEsc v tv e' t')
169 | None => match isCSP e1 with
171 coreExprToWeakExpr e2 >>= fun e' =>
172 coreTypeToWeakType t >>= fun t' =>
173 OK (WECSP v tv e' t')
174 | None => coreExprToWeakExpr e1 >>= fun e1' =>
177 coreTypeToWeakType t >>= fun t' =>
179 | _ => coreExprToWeakExpr e2
180 >>= fun e2' => OK (WEApp e1' e2')
186 | CoreELam v e => match coreVarToWeakVar v with
187 | WExprVar ev => coreExprToWeakExpr e >>= fun e' => OK (WELam ev e')
188 | WTypeVar tv => coreExprToWeakExpr e >>= fun e' => OK (WETyLam tv e')
189 | WCoerVar cv => coreExprToWeakExpr e >>= fun e' => OK (WECoLam cv e')
192 | CoreELet (CoreNonRec v ve) e => match coreVarToWeakVar v with
193 | WExprVar ev => coreExprToWeakExpr ve >>= fun ve' =>
194 coreExprToWeakExpr e >>= fun e' => OK (WELet ev ve' e')
195 | WTypeVar _ => match e with
196 | CoreEType t => Error "saw a type-let"
197 | _ => Error "saw (ELet <tyvar> e) where e!=EType"
199 | WCoerVar _ => Error "saw an (ELet <coercionVar>)"
202 | CoreELet (CoreRec rb) e =>
203 ((fix coreExprToWeakExprList (cel:list (CoreVar * (@CoreExpr CoreVar))) : ???(list (WeakExprVar * WeakExpr)) :=
206 | (v',e')::t => coreExprToWeakExprList t >>= fun t' =>
207 match coreVarToWeakVar v' with
208 | WExprVar ev => coreExprToWeakExpr e' >>= fun e' => OK ((ev,e')::t')
209 | WTypeVar _ => Error "found a type variable in a recursive let"
210 | WCoerVar _ => Error "found a coercion variable in a recursive let"
212 end) rb) >>= fun rb' =>
213 coreExprToWeakExpr e >>= fun e' =>
214 OK (WELetRec (unleaves' rb') e')
216 | CoreECase e v tbranches alts =>
217 match coreVarToWeakVar v with
218 | WTypeVar _ => Error "found a type variable in a case"
219 | WCoerVar _ => Error "found a coercion variable in a case"
221 coreTypeToWeakType (coreTypeOfCoreExpr e) >>= fun te' =>
222 expectTyConApp te' nil >>= fun tca =>
223 let (tc,lt) := tca:(TyCon * list WeakType) in
224 ((fix mkBranches (branches: list (@triple CoreAltCon (list CoreVar) (@CoreExpr CoreVar)))
225 : ???(list (WeakAltCon*list WeakTypeVar*list WeakCoerVar*list WeakExprVar*WeakExpr)) :=
228 | (mkTriple alt vars e)::rest =>
229 mkBranches rest >>= fun rest' =>
230 coreExprToWeakExpr e >>= fun e' =>
232 | DEFAULT => OK ((WeakDEFAULT,nil,nil,nil,e')::rest')
233 | LitAlt lit => OK ((WeakLitAlt lit,nil,nil,nil,e')::rest')
234 | DataAlt dc => let vars := map coreVarToWeakVar vars in
235 OK (((WeakDataAlt dc),
236 (filter (map (fun x => match x with WTypeVar v => Some v | _ => None end) vars)),
237 (filter (map (fun x => match x with WCoerVar v => Some v | _ => None end) vars)),
238 (filter (map (fun x => match x with WExprVar v => Some v | _ => None end) vars)),
243 coreExprToWeakExpr e >>= fun scrutinee =>
244 coreTypeToWeakType tbranches >>= fun tbranches' =>
245 OK (WECase ev scrutinee tbranches' tc lt (unleaves branches))