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Revision 1525 - (download) (annotate)
Thu Oct 13 15:57:40 2011 UTC (7 years, 9 months ago) by jhr
File size: 18018 byte(s)
  Pushed sequence and tuple operations through compiler (tuples are still not supported
  in the code generator).
(* tree-to-c.sml
 *
 * COPYRIGHT (c) 2011 The Diderot Project (http://diderot-language.cs.uchicago.edu)
 * All rights reserved.
 *
 * Translate TreeIL to the C version of CLang.
 *)

signature TREE_VAR_TO_C =
  sig
    type env = CLang.typed_var TreeIL.Var.Map.map
  (* translate a variable that occurs in an l-value context (i.e., as the target of an assignment) *)
    val lvalueVar : env * TreeIL.var -> CLang.exp
  (* translate a variable that occurs in a r-value context *)
    val rvalueVar : env * TreeIL.var -> CLang.exp
  (* translate a strand state variable that occurs in an l-value context *)
    val lvalueStateVar : TreeIL.state_var -> CLang.exp
  (* translate a strand state variable that occurs in a r-value context *)
    val rvalueStateVar : TreeIL.state_var -> CLang.exp
  end

functor TreeToCFn (VarToC : TREE_VAR_TO_C) : sig

    type env = CLang.typed_var TreeIL.Var.Map.map

    val trType : TreeIL.Ty.ty -> CLang.ty

    val trBlock : env * TreeIL.block -> CLang.stm

    val trFragment : env * TreeIL.block -> env * CLang.stm list

    val trAssign : env * TreeIL.var * TreeIL.exp -> CLang.stm list

    val trExp : env * TreeIL.exp -> CLang.exp

  (* vector indexing support.  Arguments are: vector, arity, index *)
    val ivecIndex : CLang.exp * int * int -> CLang.exp
    val vecIndex : CLang.exp * int * int -> CLang.exp

  end = struct

    structure CL = CLang
    structure N = CNames
    structure IL = TreeIL
    structure Op = IL.Op
    structure Ty = IL.Ty
    structure V = IL.Var

    datatype var = datatype CLang.typed_var
    type env = CLang.typed_var TreeIL.Var.Map.map

    fun lookup (env, x) = (case V.Map.find (env, x)
           of SOME(V(_, x')) => x'
            | NONE => raise Fail(concat["lookup(_, ", V.name x, ")"])
          (* end case *))

  (* integer literal expression *)
    fun intExp (i : int) = CL.mkInt(IntInf.fromInt i)

  (* translate TreeIL types to CLang types *)
    fun trType ty = (case ty
           of Ty.BoolTy => CLang.T_Named "bool"
            | Ty.StringTy => CL.charPtr
            | Ty.IntTy => !N.gIntTy
            | Ty.TensorTy[] => !N.gRealTy
            | Ty.TensorTy[n] => CL.T_Named(N.vecTy n)
            | Ty.TensorTy[n, m] => CL.T_Named(N.matTy(n,m))
            | Ty.SeqTy(Ty.IntTy, n) => CL.T_Named(N.ivecTy n)
            | Ty.SeqTy(Ty.TensorTy[] , n) => CL.T_Named(N.vecTy n)
            | Ty.AddrTy(ImageInfo.ImgInfo{ty=(_, rTy), ...}) => CL.T_Ptr(CL.T_Num rTy)
            | Ty.ImageTy(ImageInfo.ImgInfo{dim, ...}) => CL.T_Ptr(CL.T_Named(N.imageTy dim))
            | _ => raise Fail(concat["TreeToC.trType(", Ty.toString ty, ")"])
          (* end case *))

  (* generate new variables *)
    local
      val count = ref 0
      fun freshName prefix = let
            val n = !count
            in
              count := n+1;
              concat[prefix, "_", Int.toString n]
            end
    in
    fun tmpVar ty = freshName "tmp"
    fun freshVar prefix = freshName prefix
    end (* local *)

  (* translate IL basis functions *)
    local
      fun mkLookup suffix = let
            val tbl = ILBasis.Tbl.mkTable (16, Fail "basis table")
            fun ins f = ILBasis.Tbl.insert tbl (f, ILBasis.toString f ^ suffix)
            in
              List.app ins ILBasis.allFuns;
              ILBasis.Tbl.lookup tbl
            end
      val fLookup = mkLookup "f"
      val dLookup = mkLookup ""
    in
    fun trApply (f, args) = let
          val f' = if !N.doublePrecision then dLookup f else fLookup f
          in
            CL.mkApply(f', args)
          end
    end (* local *)

  (* vector indexing support.  Arguments are: vector, arity, index *)
    fun ivecIndex (v, n, ix) = let
          val unionTy = CL.T_Named(concat["union", Int.toString n, !N.gIntSuffix, "_t"])
          val e1 = CL.mkCast(unionTy, v)
          val e2 = CL.mkSelect(e1, "i")
          in
            CL.mkSubscript(e2, intExp ix)
          end

    fun vecIndex (v, n, ix) = let
          val unionTy = CL.T_Named(concat["union", Int.toString n, !N.gRealSuffix, "_t"])
          val e1 = CL.mkCast(unionTy, v)
          val e2 = CL.mkSelect(e1, "r")
          in
            CL.mkSubscript(e2, intExp ix)
          end

  (* Translate a TreeIL operator application to a CLang expression *)
    fun trOp (rator, args) = (case (rator, args)
           of (Op.Add ty, [a, b]) => CL.mkBinOp(a, CL.#+, b)
            | (Op.Sub ty, [a, b]) => CL.mkBinOp(a, CL.#-, b)
            | (Op.Mul ty, [a, b]) => CL.mkBinOp(a, CL.#*, b)
            | (Op.Div ty, [a, b]) => CL.mkBinOp(a, CL.#/, b)
            | (Op.Neg ty, [a]) => CL.mkUnOp(CL.%-, a)
            | (Op.Abs(Ty.IntTy), args) => CL.mkApply("abs", args)
            | (Op.Abs(Ty.TensorTy[]), args) => CL.mkApply(N.fabs(), args)
            | (Op.Abs ty, [a]) => raise Fail(concat["Abs<", Ty.toString ty, ">"])
            | (Op.LT ty, [a, b]) => CL.mkBinOp(a, CL.#<, b)
            | (Op.LTE ty, [a, b]) => CL.mkBinOp(a, CL.#<=, b)
            | (Op.EQ ty, [a, b]) => CL.mkBinOp(a, CL.#==, b)
            | (Op.NEQ ty, [a, b]) => CL.mkBinOp(a, CL.#!=, b)
            | (Op.GTE ty, [a, b]) => CL.mkBinOp(a, CL.#>=, b)
            | (Op.GT ty, [a, b]) => CL.mkBinOp(a, CL.#>, b)
            | (Op.Not, [a]) => CL.mkUnOp(CL.%!, a)
            | (Op.Max, args) => CL.mkApply(N.max(), args)
            | (Op.Min, args) => CL.mkApply(N.min(), args)
            | (Op.Clamp(Ty.TensorTy[]), args) => CL.mkApply(N.clamp 1, args)
            | (Op.Clamp(Ty.TensorTy[n]), args) => CL.mkApply(N.clamp n, args)
            | (Op.Lerp ty, args) => (case ty
                 of Ty.TensorTy[] => CL.mkApply(N.lerp 1, args)
                  | Ty.TensorTy[n] => CL.mkApply(N.lerp n, args)
                  | _ => raise Fail(concat[
                        "lerp<", Ty.toString ty, "> not supported"
                      ])
                (* end case *))
            | (Op.Dot d, args) => CL.E_Apply(N.dot d, args)
            | (Op.MulVecMat(m, n), args) =>
                if (1 < m) andalso (m < 4) andalso (m = n)
                  then CL.E_Apply(N.mulVecMat(m,n), args)
                  else raise Fail "unsupported vector-matrix multiply"
            | (Op.MulMatVec(m, n), args) =>
                if (1 < m) andalso (m < 4) andalso (m = n)
                  then CL.E_Apply(N.mulMatVec(m,n), args)
                  else raise Fail "unsupported matrix-vector multiply"
            | (Op.MulMatMat(m, n, p), args) =>
                if (1 < m) andalso (m < 4) andalso (m = n) andalso (n = p)
                  then CL.E_Apply(N.mulMatMat(m,n,p), args)
                  else raise Fail "unsupported matrix-matrix multiply"
            | (Op.Cross, args) => CL.E_Apply(N.cross(), args)
            | (Op.Norm(Ty.TensorTy[n]), args) => CL.E_Apply(N.length n, args)
            | (Op.Norm(Ty.TensorTy[m,n]), args) => CL.E_Apply(N.norm(m,n), args)
            | (Op.Normalize d, args) => CL.E_Apply(N.normalize d, args)
            | (Op.Scale(Ty.TensorTy[n]), args) => CL.E_Apply(N.scale n, args)
            | (Op.PrincipleEvec ty, _) => raise Fail "PrincipleEvec unimplemented"
            | (Op.Select(Ty.TupleTy tys, i), [a]) => raise Fail "Select unimplemented"
            | (Op.Index(Ty.SeqTy(Ty.IntTy, n), i), [a]) => ivecIndex (a, n, i)
            | (Op.Index(Ty.TensorTy[n], i), [a]) => vecIndex (a, n, i)
            | (Op.Subscript(Ty.SeqTy(Ty.IntTy, n)), [v, ix]) => let
                val unionTy = CL.T_Named(concat["union", Int.toString n, !N.gIntSuffix, "_t"])
                val vecExp = CL.mkSelect(CL.mkCast(unionTy, v), "i")
                in
                  CL.mkSubscript(vecExp, ix)
                end
            | (Op.Subscript(Ty.TensorTy[n]), [v, ix]) => let
                val unionTy = CL.T_Named(concat["union", Int.toString n, !N.gRealSuffix, "_t"])
                val vecExp = CL.mkSelect(CL.mkCast(unionTy, v), "r")
                in
                  CL.mkSubscript(vecExp, ix)
                end
            | (Op.Subscript(Ty.TensorTy[_,_]), [m, ix, jx]) =>
                CL.mkSubscript(CL.mkSelect(CL.mkSubscript(m, ix), "r"), jx)
            | (Op.Subscript ty, t::(ixs as _::_)) =>
                raise Fail(concat["Subscript<", Ty.toString ty, "> unsupported"])
            | (Op.Ceiling d, args) => CL.mkApply(N.addTySuffix("ceil", d), args)
            | (Op.Floor d, args) => CL.mkApply(N.addTySuffix("floor", d), args)
            | (Op.Round d, args) => CL.mkApply(N.addTySuffix("round", d), args)
            | (Op.Trunc d, args) => CL.mkApply(N.addTySuffix("trunc", d), args)
            | (Op.IntToReal, [a]) => CL.mkCast(!N.gRealTy, a)
            | (Op.RealToInt 1, [a]) => CL.mkCast(!N.gIntTy, a)
            | (Op.RealToInt d, args) => CL.mkApply(N.vecftoi d, args)
(* FIXME: need type info *)
            | (Op.ImageAddress(ImageInfo.ImgInfo{ty=(_,rTy), ...}), [a]) => let
                val cTy = CL.T_Ptr(CL.T_Num rTy)
                in
                  CL.mkCast(cTy, CL.mkIndirect(a, "data"))
                end
            | (Op.LoadVoxels(info, 1), [a]) => let
                val realTy as CL.T_Num rTy = !N.gRealTy
                val a = CL.E_UnOp(CL.%*, a)
                in
                  if (rTy = ImageInfo.sampleTy info)
                    then a
                    else CL.E_Cast(realTy, a)
                end
            | (Op.LoadVoxels _, [a]) =>
                raise Fail("impossible " ^ Op.toString rator)
            | (Op.PosToImgSpace(ImageInfo.ImgInfo{dim, ...}), [img, pos]) =>
                CL.mkApply(N.toImageSpace dim, [img, pos])
            | (Op.TensorToWorldSpace(info, ty), [v, x]) =>
                CL.mkApply(N.toWorldSpace ty, [v, x])
            | (Op.LoadImage info, [a]) =>
                raise Fail("impossible " ^ Op.toString rator)
            | (Op.Inside(ImageInfo.ImgInfo{dim, ...}, s), [pos, img]) =>
                CL.mkApply(N.inside dim, [pos, img, intExp s])
            | (Op.Input(ty, desc, name), []) =>
                raise Fail("impossible " ^ Op.toString rator)
            | (Op.InputWithDefault(ty, desc, name), [a]) =>
                raise Fail("impossible " ^ Op.toString rator)
            | _ => raise Fail(concat[
                  "unknown or incorrect operator ", Op.toString rator
                ])
          (* end case *))

    fun trExp (env, e) = (case e
           of IL.E_State x => VarToC.rvalueStateVar x
            | IL.E_Var x => VarToC.rvalueVar (env, x)
            | IL.E_Lit(Literal.Int n) => CL.mkIntTy(n, !N.gIntTy)
            | IL.E_Lit(Literal.Bool b) => CL.mkBool b
            | IL.E_Lit(Literal.Float f) => CL.mkFlt(f, !N.gRealTy)
            | IL.E_Lit(Literal.String s) => CL.mkStr s
            | IL.E_Op(rator, args) => trOp (rator, trExps(env, args))
            | IL.E_Apply(f, args) => trApply(f, trExps(env, args))
            | IL.E_Cons(Ty.TensorTy[n], args) => CL.mkApply(N.mkVec n, trExps(env, args))
            | IL.E_Cons(ty, _) => raise Fail(concat["E_Cons(", Ty.toString ty, ", _) in expression"])
          (* end case *))

    and trExps (env, exps) = List.map (fn exp => trExp(env, exp)) exps

    fun trSet (env, lhs, rhs) = (
        (* certain rhs forms, such as those that return a matrix,
         * require a function call instead of an assignment
         *)
          case rhs
           of IL.E_Op(Op.Add(Ty.TensorTy[m,n]), args) =>
                [CL.mkCall(N.addMat(m,n),  lhs :: trExps(env, args))]
            | IL.E_Op(Op.Sub(Ty.TensorTy[m,n]), args) =>
                [CL.mkCall(N.subMat(m,n),  lhs :: trExps(env, args))]
            | IL.E_Op(Op.Neg(Ty.TensorTy[m,n]), args) =>
                [CL.mkCall(N.scaleMat(m,n),  lhs :: intExp ~1 :: trExps(env, args))]
            | IL.E_Op(Op.Scale(Ty.TensorTy[m,n]), args) =>
                [CL.mkCall(N.scaleMat(m,n),  lhs :: trExps(env, args))]
            | IL.E_Op(Op.MulMatMat(m,n,p), args) =>
                [CL.mkCall(N.mulMatMat(m,n,p), lhs :: trExps(env, args))]
            | IL.E_Op(Op.Identity n, args) =>
                [CL.mkCall(N.identityMat n, [lhs])]
            | IL.E_Op(Op.Zero(Ty.TensorTy[m,n]), args) =>
                [CL.mkCall(N.zeroMat(m,n), [lhs])]
            | IL.E_Op(Op.TensorToWorldSpace(info, ty as Ty.TensorTy[_,_]), args) =>
                [CL.mkCall(N.toWorldSpace ty, lhs :: trExps(env, args))]
            | IL.E_Op(Op.LoadVoxels(info, n), [a]) =>
                if (n > 1)
                  then let
                    val stride = ImageInfo.stride info
                    val rTy = ImageInfo.sampleTy info
                    val vp = freshVar "vp"
                    val needsCast = (CL.T_Num rTy <> !N.gRealTy)
                    fun mkLoad i = let
                          val e = CL.mkSubscript(CL.mkVar vp, intExp(i*stride))
                          in
                            if needsCast then CL.mkCast(!N.gRealTy, e) else e
                          end
                    in [
                      CL.mkDecl(CL.T_Ptr(CL.T_Num rTy), vp, SOME(CL.I_Exp(trExp(env, a)))),
                      CL.mkAssign(lhs,
                        CL.mkApply(N.mkVec n, List.tabulate (n, mkLoad)))
                    ] end
                else [CL.mkAssign(lhs, trExp(env, rhs))]
            | IL.E_Cons(Ty.TensorTy[n,m], args) => let
              (* matrices are represented as arrays of union<d><ty>_t vectors *)
                fun doRows (_, []) = []
                  | doRows (i, e::es) =
                      CL.mkAssign(CL.mkSelect(CL.mkSubscript(lhs, intExp i), "v"), e)
                        :: doRows (i+1, es)
                in
                  doRows (0, trExps(env, args))
                end
            | IL.E_Var x => (case IL.Var.ty x
                 of Ty.TensorTy[n,m] => [CL.mkCall(N.copyMat(n,m), [lhs, VarToC.rvalueVar(env, x)])]
                  | _ => [CL.mkAssign(lhs, VarToC.rvalueVar(env, x))]
                (* end case *))
            | _ => [CL.mkAssign(lhs, trExp(env, rhs))]
          (* end case *))

    fun trAssign (env, lhs, rhs) = trSet (env, VarToC.lvalueVar (env, lhs), rhs)

    fun trLocals (env : env, locals) = 
          List.foldl
            (fn (x, env) => V.Map.insert(env, x, V(trType(V.ty x), V.name x)))
              env locals

  (* generate code to check the status of runtime-system calls *)
    fun checkSts mkDecl = let
          val sts = freshVar "sts"
          in
            mkDecl sts @
            [CL.mkIfThen(
              CL.mkBinOp(CL.mkVar "DIDEROT_OK", CL.#!=, CL.mkVar sts),
              CL.mkCall("exit", [intExp 1]))]
          end

    fun trStms (env, stms) = let
          fun trStmt (env, stm) = (case stm
                 of IL.S_Comment text => [CL.mkComment text]
                  | IL.S_Assign(x, exp) => trAssign (env, x, exp)
                  | IL.S_IfThen(cond, thenBlk) =>
                      [CL.mkIfThen(trExp(env, cond), trBlk(env, thenBlk))]
                  | IL.S_IfThenElse(cond, thenBlk, elseBlk) =>
                      [CL.mkIfThenElse(trExp(env, cond),
                        trBlk(env, thenBlk),
                        trBlk(env, elseBlk))]
                  | IL.S_New _ => raise Fail "new not supported yet" (* FIXME *)
                  | IL.S_Save(x, exp) => trSet (env, VarToC.lvalueStateVar x, exp)
                  | IL.S_LoadImage(lhs, dim, name) => checkSts (fn sts => let
                      val lhs = VarToC.lvalueVar (env, lhs)
                      val name = trExp(env, name)
                      val imgTy = CL.T_Named(N.imageTy dim)
                      val loadFn = N.loadImage dim
                      in [
                        CL.mkDecl(
                          CL.T_Named N.statusTy, sts,
                          SOME(CL.I_Exp(CL.E_Apply(loadFn, [name, CL.mkUnOp(CL.%&, lhs)]))))
                      ] end)
                  | IL.S_Input(lhs, name, desc, optDflt) => let
                      val inputFn = N.input(V.ty lhs)
                      val lhs = VarToC.lvalueVar (env, lhs)
                      val (initCode, hasDflt) = (case optDflt
                             of SOME e => ([CL.mkAssign(lhs, trExp(env, e))], true)
                              | NONE => ([], false)
                            (* end case *))
                      val code = [CL.mkCall(inputFn, [
                              CL.mkVar "opts",
                              CL.mkStr name,
                              CL.mkStr desc,
                              CL.mkUnOp(CL.%&, lhs),
                              CL.mkBool hasDflt])]
                      in
                        initCode @ code
                      end
                  | IL.S_Exit args => [CL.mkReturn NONE]
                  | IL.S_Active => [CL.mkReturn(SOME(CL.mkVar N.kActive))]
                  | IL.S_Stabilize => [CL.mkReturn(SOME(CL.mkVar N.kStabilize))]
                  | IL.S_Die => [CL.mkReturn(SOME(CL.mkVar N.kDie))]
                (* end case *))
          in
            List.foldr (fn (stm, stms) => trStmt(env, stm)@stms) [] stms
          end

    and trBlk (env, IL.Block{locals, body}) = let
          val env = trLocals (env, locals)
          val stms = trStms (env, body)
          fun mkDecl (x, stms) = (case V.Map.find (env, x)
                 of SOME(V(ty, x')) => CL.mkDecl(ty, x', NONE) :: stms
                  | NONE => raise Fail(concat["mkDecl(", V.name x, ", _)"])
                (* end case *))
          val stms = List.foldr mkDecl stms locals
          in
            CL.mkBlock stms
          end

    fun trFragment (env, IL.Block{locals, body}) = let
          val env = trLocals (env, locals)
          val stms = trStms (env, body)
          fun mkDecl (x, stms) = (case V.Map.find (env, x)
                 of SOME(V(ty, x')) => CL.mkDecl(ty, x', NONE) :: stms
                  | NONE => raise Fail(concat["mkDecl(", V.name x, ", _)"])
                (* end case *))
          val stms = List.foldr mkDecl stms locals
          in
            (env, stms)
          end

    val trBlock = trBlk

  end

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