(* mid-il-types.sml
 *
 * COPYRIGHT (c) 2010 The Diderot Project (http://diderot.cs.uchicago.edu)
 * All rights reserved.
 *
 * Types for the MidIL.
 *)

structure MidILTypes =
  struct

    datatype ty
      = BoolTy | StringTy
      | IVecTy of int		(* integers; both scalars and vectors *)
      | VecTy of int		(* reals; both scalars and vectors *)
      | AddrTy			(* voxel address *)

    val intTy = IVecTy 0
    val realTy = VecTy 0

    fun same (ty1 : ty, ty2) = (ty1 = ty2)

    fun hash BoolTy = 0w1
      | hash StringTy = 0w2
      | hash (IVecTy d) = 0w7 * Word.fromInt d + 0w3
      | hash (VecTy d) = 0w11 * Word.fromInt d + 0w4
      | hash AddrTy = 0w5

    fun toString BoolTy = "bool"
      | toString StringTy = "string"
      | toString (IVecTy 0) = "int"
      | toString (IVecTy d) = "int" ^ Int.toString d
      | toString (VecTy 0) = "real"
      | toString (VecTy d) = "real" ^ Int.toString d
      | toString AddrTy = "addr"

  end