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|
(*
* Machine description environment.
*)
functor MDLEnv(TypeUtils : MDL_TYPE_UTILS) : MDL_ENV =
struct
structure Ast = TypeUtils.Ast
structure AstPP = TypeUtils.AstPP
structure Error = MDLError
datatype env =
ENV of
{ TE : Ast.ty Env.env, (* type environment *)
VE : (Ast.exp * Ast.ty) Env.env, (* value environment *)
EE : (Ast.decl list * env) Env.env, (* structure environment *)
DE : Ast.decl list, (* declarations environment *)
SE : Ast.decl list (* signature environment *)
}
open Ast
infix ++
infix $$
infix ==>
val op $$ = Env.union
val op ==> = Env.bind
val O = Env.empty
val empty = ENV{TE=O, VE=O, EE=O, DE=[], SE=[]}
fun (ENV{TE=TE1, VE=VE1, EE=EE1, DE=DE1, SE=SE1}) ++
(ENV{TE=TE2, VE=VE2, EE=EE2, DE=DE2, SE=SE2}) =
ENV{TE=TE1 $$ TE2, VE=VE1 $$ VE2, EE=EE1 $$ EE2, DE=DE1@DE2, SE=SE1@SE2}
fun mkDECL d = ENV{TE=O, VE=O, EE=O, DE=[d], SE=[]}
fun mkSIG d = ENV{TE=O, VE=O, EE=O, DE=[], SE=[d]}
fun mkVALs vbs = ENV{TE=O, VE=vbs, EE=O, DE=[], SE=[]}
fun VALbind(id,e,t)= mkVALs(id ==> (e,t))
fun TYPEbind(id,t) = ENV{TE=id ==> t, VE=O, EE=O, DE=[], SE=[]}
fun STRbind(id,args,E) = ENV{TE=O, VE=O, EE= id ==> (args,E), DE=[], SE=[]}
(* Create a new free variable; instantiation and generalization *)
fun var(ENV _) = TypeUtils.newVar 0 (* XXX *)
fun inst(ENV _) t = TypeUtils.inst 0 t (* XXX *)
fun gen(ENV _) t = TypeUtils.gen 0 t (* XXX *)
fun lambda(ENV _) t = TypeUtils.lambda 0 t (* XXX *)
(* Extract components *)
fun DE(ENV{DE, ...}) = DE
fun SE(ENV{SE, ...}) = SE
fun datatypeDefinitions(ENV{DE,...}) =
let fun collect(DATATYPEdecl(dbs, _), dbs') = dbs @ dbs'
| collect(MARKdecl(_, d), dbs') = collect(d, dbs')
| collect(_, dbs') = dbs'
in List.foldr collect [] DE
end
(* Lookup components from the environment *)
fun lookupTy (E as ENV{TE,EE,...}) (IDENT([],id)) =
(Env.look TE id
handle _ => (Error.error("undefined type '"^id^"'"); var E))
| lookupTy (ENV{EE,...}) (IDENT(s::ss,id)) =
lookupTy (lookupStr' EE (IDENT(ss,s))) (IDENT([],id))
and lookupVal' err (E as ENV{VE,EE,...}) (IDENT([],id)) =
(inst E (Env.look VE id)
handle _ => (err id; (LITexp(INTlit 0), var E)))
| lookupVal' err (ENV{EE,...}) (IDENT(s::ss,id)) =
lookupVal' err (lookupStr' EE (IDENT(ss,s))) (IDENT([],id))
and lookupVal E x = lookupVal'
(fn x => Error.error("undefined value '"^x^"'")) E x
and lookupStr (ENV{EE,...}) id = lookupStr' EE id
and lookupStr' EE (IDENT([],id)) =
(#2(Env.look EE id)
handle _ =>
(Error.error("undefined structure '"^id^"'"); empty))
| lookupStr' EE (IDENT(s::ss,id)) =
lookupStr (lookupStr' EE (IDENT(ss,s))) (IDENT([],id))
(* Interators *)
fun foldVal f x (ENV{VE, ...}) =
Env.fold (fn (id,(e,ty),l) => f(id,e,ty,l)) x VE
(*
* Elaborate a declaration in an environment.
* Return an environment.
*)
fun elab E d =
let (* elaborate a declaration *)
val mkDECL = fn(l,d) => mkDECL(MARKdecl(l,d))
val mkSIG = fn(l,d) => mkSIG(MARKdecl(l,d))
fun D E l (d as DATATYPEdecl(dbs,tys)) = mkDECL(l,d) ++ mkSIG(l,d)
| D E l (d as INSTRUCTIONdecl cbs) = mkDECL(l,d)
| D E l (d as FUNdecl _) = mkDECL(l,d)
| D E l (d as RTLdecl _) = mkDECL(l,d)
| D E l (d as RTLSIGdecl _) = mkDECL(l,d)
| D E l (d as VALdecl _) = mkDECL(l,d)
| D E l (d as TYPESIGdecl _) = mkSIG(l,d)
| D E l (d as VALSIGdecl _) = mkSIG(l,d)
| D E l (d as LOCALdecl(d1,d2)) = mkDECL(l,d)
(* let val E' = Ds E l d1 in Ds (E ++ E') l d2 end *)
| D E l (d as SEQdecl ds) = Ds E l ds
| D E l (d as OPENdecl ids) = mkDECL(l,d) ++ openStrs E ids
| D E l (d as STRUCTUREdecl(id,args,_,DECLsexp ds)) =
let val E' = Ds E l ds
in STRbind(id,args,E') ++ mkDECL(l,d) end
| D E l (STRUCTURESIGdecl _) = empty
| D E l (d as INFIXdecl _) = mkDECL(l,d)
| D E l (d as INFIXRdecl _) = mkDECL(l,d)
| D E l (d as NONFIXdecl _) = mkDECL(l,d)
| D E _ (MARKdecl(l,d)) = (Error.setLoc l; D E l d)
| D E l d = Error.fail("illegal declaration: "^
(PP.text(AstPP.decl d)))
and Ds E l [] = empty
| Ds E l (d::ds) = let val E' = D E l d
in E' ++ Ds (E ++ E') l ds end
(* open up a list of structures *)
and openStrs E ids =
List.foldr (fn (id,E') => lookupStr E id ++ E') empty ids
in D E SourceMapping.dummyLoc d
end
(*
* Treat a type expression as a pattern and
* compute its set of bindings. Duplicated names are assigned
* unique suffixes.
*)
fun bindingsInType ty =
let val names = Env.envir "names"
fun count id = let val (n,total) = Env.lookup names id
in total := !total + 1 end
handle _ => Env.update names (id,(ref 0,ref 1))
fun getName id = let val (n,total) = Env.lookup names id
in if !total = 1 then id else
(n := !n + 1; id^Int.toString(!n))
end
fun f(IDty(IDENT(_,id))) = count id
| f(APPty(_,[ty])) = f ty
| f(CELLty id) = count id
| f(TUPLEty tys) = app f tys
| f(RECORDty ltys) = app (fn (id,_) => count id) ltys
| f _ = ()
in f ty; (!names,getName) end
(* Lookup from nested environment *)
fun declOf(ENV{EE, ...}) id =
let val (_, ENV{DE,...}) = Env.look EE id
in SEQdecl DE
end handle _ => $ []
fun fctArgOf(ENV{EE, ...}) id =
let val (args, _) = Env.look EE id
in SEQdecl args
end handle _ => $ []
fun typeOf(ENV{EE, ...}) id =
let val (_, ENV{SE,...}) = Env.look EE id
in SEQdecl SE
end handle _ => $ []
end
|
