static void Shadowing1()
{
var p0 = Expression.Parameter(typeof(int));
var p1 = Expression.Parameter(typeof(int));
var p2 = Expression.Parameter(typeof(int));
var p3 = Expression.Parameter(typeof(int));
var e = Expression.Block(new[] { p0, p1 }, Expression.Block(new[] { p1, p2 }, Expression.Block(new[] { p2, p3 }, Expression.Block(new[] { p3, p1 }, Expression.Add(p0, Expression.Multiply(p1, Expression.Subtract(p2, p3)))))));
var r = ShadowEliminator.Eliminate(e);
}
public void ShadowEliminator_Shadow_Block1()
{
var x = Expression.Parameter(typeof(int));
var e = Expression.Block(new[] { x }, Expression.Block(new[] { x }, x));
var r = (BlockExpression)ShadowEliminator.Eliminate(e);
var v1 = r.Variables[0];
var e1 = (BlockExpression)r.Expressions[0];
var v2 = e1.Variables[0];
var e2 = e1.Expressions[0];
Assert.AreSame(v2, e2);
Assert.AreNotSame(v1, v2);
}
public void ShadowEliminator_Shadow_Lambda()
{
var x = Expression.Parameter(typeof(int));
var e = Expression.Lambda(Expression.Lambda(x, x), x);
var r = (LambdaExpression)ShadowEliminator.Eliminate(e);
var v1 = r.Parameters[0];
var e1 = (LambdaExpression)r.Body;
var v2 = e1.Parameters[0];
var e2 = e1.Body;
Assert.AreSame(v2, e2);
Assert.AreNotSame(v1, v2);
}
public void ShadowEliminator_Shadow_ForEach()
{
var x = Expression.Parameter(typeof(int));
var xs = Expression.Default(typeof(int[]));
var e = CSharpExpression.ForEach(x, xs, CSharpExpression.ForEach(x, xs, x));
var r = (ForEachCSharpStatement)ShadowEliminator.Eliminate(e);
var v1 = r.Variable;
var e1 = (ForEachCSharpStatement)r.Body;
var v2 = e1.Variable;
var e2 = e1.Body;
Assert.AreSame(v2, e2);
Assert.AreNotSame(v1, v2);
}
public void ShadowEliminator_Shadow_Using()
{
var x = Expression.Parameter(typeof(IDisposable));
var y = Expression.Default(typeof(IDisposable));
var e = CSharpExpression.Using(x, y, CSharpExpression.Using(x, y, x));
var r = (UsingCSharpStatement)ShadowEliminator.Eliminate(e);
var v1 = r.Variable;
var e1 = (UsingCSharpStatement)r.Body;
var v2 = e1.Variable;
var e2 = e1.Body;
Assert.AreSame(v2, e2);
Assert.AreNotSame(v1, v2);
}
public void ShadowEliminator_Shadow_Catch()
{
var x = Expression.Parameter(typeof(Exception));
var e = Expression.TryCatch(Expression.Empty(), Expression.Catch(x, Expression.TryCatch(Expression.Empty(), Expression.Catch(x, Expression.Block(typeof(void), x)))));
var r = (TryExpression)ShadowEliminator.Eliminate(e);
var h1 = r.Handlers[0];
var v1 = h1.Variable;
var e1 = (TryExpression)h1.Body;
var h2 = e1.Handlers[0];
var v2 = h2.Variable;
var e2 = ((BlockExpression)h2.Body).Expressions[0];
Assert.AreSame(v2, e2);
Assert.AreNotSame(v1, v2);
}
public void ShadowEliminator_Shadow_For()
{
var x = Expression.Parameter(typeof(int));
var i = Expression.Assign(x, Expression.Constant(0));
var b = Expression.Default(typeof(bool));
var e = CSharpExpression.For(new[] { i }, b, null, CSharpExpression.For(new[] { i }, b, null, x));
var r = (ForCSharpStatement)ShadowEliminator.Eliminate(e);
var v1 = r.Variables[0];
var e1 = (ForCSharpStatement)r.Body;
var v2 = e1.Variables[0];
var e2 = e1.Body;
Assert.AreSame(v2, e2);
Assert.AreNotSame(v1, v2);
}
public void ShadowEliminator_Shadow_Block2()
{
var x = Expression.Parameter(typeof(int));
var l1 = Expression.Label();
var l2 = Expression.Label();
var e = CSharpStatement.Block(new[] { x }, new Expression[] { CSharpStatement.Block(new[] { x }, new Expression[] { x }, l2) }, l1);
var r = (BlockCSharpExpression)ShadowEliminator.Eliminate(e);
var v1 = r.Variables[0];
var e1 = (BlockCSharpExpression)r.Statements[0];
var v2 = e1.Variables[0];
var e2 = e1.Statements[0];
Assert.AreSame(v2, e2);
Assert.AreNotSame(v1, v2);
}
public void ShadowEliminator_Shadow_Switch()
{
var v = Expression.Constant(1);
var l = Expression.Label();
var x = Expression.Parameter(typeof(int));
var e = CSharpExpression.Switch(v, l, new[] { x }, new[] { CSharpExpression.SwitchCase(new[] { 1 }, CSharpExpression.Switch(x, l, new[] { x }, new[] { CSharpExpression.SwitchCase(new[] { 2 }, x) })) });
var r = (SwitchCSharpStatement)ShadowEliminator.Eliminate(e);
var v1 = r.Variables[0];
var e1 = (SwitchCSharpStatement)r.Cases[0].Statements[0];
var vi = e1.SwitchValue; // not in inner scope
var v2 = e1.Variables[0];
var e2 = e1.Cases[0].Statements[0];
Assert.AreSame(v1, vi); // not in inner scope
Assert.AreSame(v2, e2);
Assert.AreNotSame(v1, v2);
}
public void ShadowEliminator_NoShadow()
{
var v1 = Expression.Parameter(typeof(int));
var v2 = Expression.Parameter(typeof(int));
var e1 = Expression.Parameter(typeof(Exception));
var e2 = Expression.Parameter(typeof(Exception));
var d1 = Expression.Parameter(typeof(IDisposable));
var d2 = Expression.Parameter(typeof(IDisposable));
var r1 = Expression.Default(typeof(IDisposable));
var r2 = Expression.Default(typeof(IDisposable));
var c1 = Expression.Parameter(typeof(int[]));
var c2 = Expression.Parameter(typeof(int[]));
var i1 = Expression.Default(typeof(int));
var b1 = Expression.Default(typeof(bool));
var l1 = Expression.Label();
var l2 = Expression.Label();
var x1 = Expression.Constant(1);
var x2 = Expression.Constant(2);
var es = new Expression[]
{
Expression.Block(new[] { v1 }, Expression.Block(new[] { v2 }, Expression.Add(v1, v2))),
Expression.Lambda(Expression.Lambda(Expression.Add(v1, v2), v2), v1),
Expression.TryCatch(Expression.Empty(), Expression.Catch(e1, Expression.TryCatch(Expression.Empty(), Expression.Catch(e2, Expression.Empty())))),
Expression.TryCatch(Expression.Empty(), Expression.Catch(typeof(Exception), Expression.TryCatch(Expression.Empty(), Expression.Catch(typeof(Exception), Expression.Empty())))),
CSharpExpression.Using(d1, r1, CSharpExpression.Using(d2, r1, Expression.Empty())),
CSharpExpression.Using(r1, CSharpExpression.Using(r1, Expression.Empty())),
CSharpExpression.ForEach(v1, c1, CSharpExpression.ForEach(v2, c2, Expression.Empty())),
CSharpExpression.For(new[] { Expression.Assign(v1, i1) }, b1, null, CSharpExpression.For(new[] { Expression.Assign(v2, i1) }, b1, null, Expression.Empty())),
CSharpExpression.Switch(x1, l1, new[] { v1 }, new[] { CSharpExpression.SwitchCase(new[] { 1 }, CSharpExpression.Switch(x2, l2, new[] { v2 }, new[] { CSharpExpression.SwitchCase(new[] { 2 }, Expression.Add(v1, v2)) })) }),
CSharpExpression.Block(new[] { v1 }, new Expression[] { CSharpExpression.Block(new[] { v2 }, new Expression[] { Expression.Add(v1, v2) }, l1) }, l2),
};
foreach (var e in es)
{
Assert.AreSame(e, ShadowEliminator.Eliminate(e));
}
}