Code coverage for expr_div.li

///////////////////////////////////////////////////////////////////////////////
//                             Lisaac Compiler                               //
//                                                                           //
//                   LSIIT - ULP - CNRS - INRIA - FRANCE                     //
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//                     http://isaacproject.u-strasbg.fr/                     //
///////////////////////////////////////////////////////////////////////////////
Section Header

  + name        := EXPR_DIV;

  - copyright   := "2003-2007 Benoit Sonntag";


  - author      := "Sonntag Benoit (bsonntag@loria.fr)";
  - comment     := "Div Binary Expression.";

Section Inherit

  + parent_expr_binary:Expanded EXPR_BINARY;

Section Public

  - symbol:STRING_CONSTANT := "/";

  //
  // Execute.
  //

  - exec_conservator_right right_cst:INTEGER_CST :EXPR <-
  //-- E / 0   -> Error.
  //-- E /   1 -> E
  //-- E /  -1 -> - E
  //-- E / 2^n -> E >> n
  ( + result:EXPR;
    + v:INTEGER_64;

    (right_cst.value = 0).if {
      warning_error (position,"Division by zero.");
    }.elseif {right_cst.value = 1} then {
      result := left;
      right_cst.remove;
    }.elseif {right_cst.value = -1} then {
      result := EXPR_NEG.create position with left;
      right_cst.remove;
    }.elseif {(v := right_cst.to_power) != -1} then {
      right_cst.set_value v;
      result := EXPR_SHIFT_R.create position with left and right_cst;
    };
    result
  );

  - exec left_cst:INTEGER_CST and right_cst:INTEGER_CST :EXPR <-
  //-- C1 / C2 -> C3
  ( + result:EXPR;

    (right_cst.value != 0).if {
      left_cst.set_value (left_cst.value / right_cst.value);
      right_cst.remove;
      result := left_cst;
    };
    result
  );

  - exec:EXPR <-
  //--  E /  E ->  1
  //-- -E /  E -> -1
  //--  E / -E -> -1
  ( + result:EXPR;
    + neg:EXPR_NEG;

    (right ~= left).if {
      result := INTEGER_CST.create position value 1 type static_type;
      right.remove;
      left .remove;
    } else {
      neg ?= left;
      ((neg != NULL)    {neg.right ~= right}).if {
	result := INTEGER_CST.create position value (-1) type static_type;
	left.remove;
	right.remove;
      } else {
	neg ?= right;
	((neg != NULL)    {neg.right ~= left}).if {
	  result := INTEGER_CST.create position value (-1) type static_type;
	  left.remove;
	  right.remove;
	};
      };
    };
    result
  );

  - exec_left  left_cst :INTEGER_CST :EXPR <-
  //-- 0 / E -> 0
  ( + result:EXPR;

    (left_cst.value = 0).if {
      result := left_cst;
      right.remove;
    };
    result
  );