m3front/src/builtinOps/Floor.m3


Copyright (C) 1994, Digital Equipment Corp.
File: Floor.m3 Last Modified On Mon Sep 26 09:15:22 PDT 1994 By kalsow Modified On Tue Mar 20 04:11:50 1990 By muller

MODULE Floor;

IMPORT CG, CallExpr, Expr, Type, Procedure, Ceiling, Int, ReelExpr;

VAR Z: CallExpr.MethodList;

PROCEDURE Check (ce: CallExpr.T;  VAR cs: Expr.CheckState) =
  BEGIN
    Ceiling.DoCheck ("FLOOR", ce, cs);
  END Check;

PROCEDURE Compile (ce: CallExpr.T) =
  VAR e := ce.args[0];
  BEGIN
    Expr.Compile (e);
    CG.Floor (Type.CGType (Expr.TypeOf (e)));
  END Compile;

PROCEDURE Fold (ce: CallExpr.T): Expr.T =
  VAR e, x: Expr.T;
  BEGIN
    e := Expr.ConstValue (ce.args[0]);
    IF    (e = NIL)              THEN RETURN NIL;
    ELSIF ReelExpr.Floor (e, x)  THEN RETURN x;
    ELSE  (* bogus *)                 RETURN NIL;
    END;
  END Fold;

PROCEDURE Initialize () =
  BEGIN
    Z := CallExpr.NewMethodList (1, 1, TRUE, FALSE, TRUE, Int.T,
                                 NIL,
                                 CallExpr.NotAddressable,
                                 Check,
                                 CallExpr.PrepArgs,
                                 Compile,
                                 CallExpr.NoLValue,
                                 CallExpr.NoLValue,
                                 CallExpr.NotBoolean,
                                 CallExpr.NotBoolean,
                                 Fold,
                                 CallExpr.IsNever, (* writable *)
                                 CallExpr.IsNever, (* designator *)
                                 CallExpr.NotWritable (* noteWriter *));
    Procedure.Define ("FLOOR", Z, TRUE);
  END Initialize;

BEGIN
END Floor.