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(* typechecker.sml
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*
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* COPYRIGHT (c) 2010 The Diderot Project (http://diderot.cs.uchicago.edu)
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* All rights reserved.
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*)
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structure Typechecker : sig
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val check : ParseTree.program -> AST.program
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end = struct
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structure PT = ParseTree
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structure Ty = Types
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(* check a differentiation level, which muse be >= 0 *)
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fun checkDiff (cxt, k) =
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if (k < 0)
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then raise Fail "differentiation must be >= 0"
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else Ty.DiffConst(IntInf.toInt k)
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(* check a dimension, which must be 2 or 3 *)
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fun checkDim (cxt, d) =
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if (d < 2) orelse (3 < d)
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then raise Fail "invalid dimension; must be 2 or 3"
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else Ty.DimConst(IntInf.toInt d)
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(* check a shape *)
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fun checkShape (cxt, shape) = let
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fun chkDim d = if (d < 1)
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then raise Fail "invalid shape dimension; must be >= 1"
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else Ty.DimConst(IntInf.toInt d)
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in
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Ty.Shape(List.map chkDim shape)
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end
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(* check the well-formedness of a type and translate it to an AST type *)
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fun checkTy (cxt, ty) = (case ty
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of PT.T_Mark m => checkTy(#span m, #tree m)
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| PT.T_Bool => Ty.T_Bool
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| PT.T_Int => Ty.T_Int
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| PT.T_Real => Ty.realTy
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| PT.T_String => Ty.T_String
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| PT.T_Vec n => (* NOTE: the parser guarantees that 2 <= n <= 4 *)
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Ty.vecTy(IntInf.toInt n)
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| PT.T_Kernel k => Ty.T_Kernel(checkDiff(cxt, k))
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| PT.T_Field{diff, dim, shape} => Ty.T_Field{
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diff = checkDiff (cxt, diff),
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dim = checkDim (cxt, dim),
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shape = checkShape (cxt, shape)
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}
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| PT.T_Tensor shape => Ty.T_Tensor(checkShape(cxt, shape))
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| PT.T_Image{dim, shape} => Ty.T_Image{
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dim = checkDim (cxt, dim),
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shape = checkShape (cxt, shape)
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}
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| PT.T_Array(ty, dims) => raise Fail "Array type"
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(* end case *))
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fun checkLit lit = (case lit
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of (Literal.Int _) => (AST.E_Lit lit, Ty.T_Int)
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| (Literal.Float _) => (AST.E_Lit lit, Ty.realTy)
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| (Literal.String s) => (AST.E_Lit lit, Ty.T_String)
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| (Literal.Bool _) => (AST.E_Lit lit, Ty.T_Bool)
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(* end case *))
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(*
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(* typecheck an expression and translate it to AST *)
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fun checkExpr (env, cxt, e) = (case e
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of PT.E_Mark m => checkExpr (env, #span m, #tree m)
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| PT.E_Var x => (case Env.findVar (env, x)
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of SOME x' => (case Var.typeOf x'
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of ([], ty) => (E_Var x', ty)
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| (tvs, ty) => raise Fail "unimplemented"
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(* end case *))
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| NONE => raise Fail "undefined variable"
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(* end case *))
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| PT.E_Lit lit => checkLit lit
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| PT.E_BinOp of expr * var * expr
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| PT.E_UnaryOp of var * expr
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| PT.E_Tuple of expr list
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| PT.E_Apply of var * expr list
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| PT.E_Cons of ty * expr list
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| PT.E_Diff of expr
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| PT.E_Norm of expr
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(* end case *))
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fun checkVarDecl (env, cxt, kind, d) = (case d
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of PT.VD_Mark m => checkVarDecl (env, #span m, kind, #tree m)
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| PT.VD_Decl(ty, x, e) => let
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val ty = checkType ty
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val x' = Var.new (x, kind, ty)
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val (e', ty') = checkExpr (env, cxt, e)
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in
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(* FIXME: check types *)
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AST.VD_Decl(x', e')
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end
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(* end case *))
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(* typecheck a statement and translate it to AST *)
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fun checkStmt (env, cxt, s) = (case s
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of PT.S_Mark m => checkStmt (env, #span m, #tree m)
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| PT.S_Block stms => let
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fun chk (_, [], stms) = AST.S_Block(List.rev stms)
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| chk (env, s::ss, stms) = let
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val (s', env') = checkStmt (env, cxt, s)
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in
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chk (env', ss, s'::ss)
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end
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in
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(chk (env, stms, []), env)
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end
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| PT.S_Decl vd => let
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val vd as AST.VD_Decl(x, _) = checkVarDecl (env, cxt, Var.LocalVar, vd)
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in
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(AST.S_Decl vd, Env.insertLocal(env, x, x'))
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end
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| PT.S_IfThen(e, s) => let
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val (e', ty) = checkExpr (env, cxt, e)
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val s' = checkStmt (env, cxt, s)
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in
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(* check that condition has bool type *)
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case ty
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of Ty.T_Bool => ()
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| _ => raise Fail "condition not boolean type"
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(* end case *);
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(AST.S_IfThenElse(e', s', AST.S_Block[]), env)
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end
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| PT.S_IfThenElse(e, s1, s2) => let
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val (e', ty) = checkExpr (env, cxt, e)
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val s1' = checkStmt (env, cxt, s1)
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val s2' = checkStmt (env, cxt, s2)
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in
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(* check that condition has bool type *)
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case ty
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of Ty.T_Bool => ()
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| _ => raise Fail "condition not boolean type"
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(* end case *);
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(AST.S_IfThenElse(e', s1', s2'), env)
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end
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| PT.S_Assign(x, e) => (case Env.findVar (env, x)
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of NONE => raise Fail "undefined variable"
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| SOME x' => let
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val (e', ty) = checkExpr (env, cxt, e)
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in
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(* FIXME: check types *)
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(* check that x' is mutable *)
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case Var.kindOf x'
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of Var.ActorStateVar => ()
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| Var.LocalVar => ()
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| _ => raise Fail "assignment to immutable variable"
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(* end case *);
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(AST.S_Assign(x', e'), env)
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end
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(* end case *))
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| PT.S_New(actor, args) => let
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val argTys' = List.map (fn e => checkExpr(env, cxt, e)) args
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val (args', tys') = ListPair.unzip argTys'
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in
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(* FIXME: check that actor is defined and has the argument types match *)
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AST.S_New(actor, args')
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end
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| PT.S_Die => (AST.S_Die, env)
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| PT.S_Stabilize => (AST.S_Stabilize, env)
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(* end case *))
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fun checkDecl (env, cxt, d) = (case d
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of PT.D_Mark m => checkDecl (env, #span m, #tree m)
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| PT.D_Input(ty, x, optExp) => let
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val ty = checkTy(cxt, ty)
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val x' = Var.new(x, Var.InputVar, ty)
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val dcl = (case optExp
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of NONE => AST.D_Input(x', NONE)
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| SOME e => let
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val (e', ty') = checkExpr (env, cxt, e)
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in
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(* FIXME: check types *)
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AST.D_Input(x', SOME e')
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end
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(* end case *))
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in
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(dcl, Env.insertGlobal(env, x, x'))
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end
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| PT.D_Var vd => let
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val vd as AST.VD_Decl(x, _) = checkVarDecl (env, cxt, Var.GlobalVar, vd)
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in
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(AST.D_Var vd, Env.insertGlobal(env, x, x'))
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end
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| PT.D_Actor{nam, params, state, methods} => ??
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| PT.D_InitialArray of create * iter list
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| PT.D_InitialCollection of create * iter list
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(* end case *))
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*)
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fun check (PT.Program dcls) = AST.Program[]
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end
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