public void LetCoalescer_Simple()
{
{
var e =
Infer(() =>
from i in Enumerable.Range(0, 1)
let x = 42
let y = i
let z = 100
let a = x
let b = i.ToString()
let c = 2
let d = i + 1
let f = i * 3
select i
).Body;
var converter = new EnumerableToQueryTreeConverter();
var q = converter.Convert(e);
var l = new LetOptimizer();
var o = l.Optimize(q);
var r = o.Reduce();
var counter = new SelectCountingVisitor();
counter.Visit(r);
Assert.AreEqual(2, counter.Count); // one for the coalesced let and one for the final select
Assert.AreEqual(0, r.Funcletize <IEnumerable <int> >().Compile()().First());
}
{
var e =
Infer(() =>
from i in Enumerable.Range(0, 1)
let x = 42
let y = i
let z = 100
let a = i
let b = i.ToString()
let c = 2
let d = "b = " + b
let f = i * 3
select i
).Body;
var converter = new EnumerableToQueryTreeConverter();
var q = converter.Convert(e);
var l = new LetOptimizer();
var o = l.Optimize(q);
var r = o.Reduce();
var counter = new SelectCountingVisitor();
counter.Visit(r);
Assert.AreEqual(3, counter.Count); // two for the coalesced let and one for the final select
Assert.AreEqual(e.Funcletize <IEnumerable <int> >().Compile()().First(), r.Funcletize <IEnumerable <int> >().Compile()().First());
}
{
var e =
Infer(() =>
from i in Enumerable.Range(0, 1)
let x = 42
let y = i
let z = 100
let a = x
let b = i.ToString()
let c = 2
let d = i + 1
let f = i - 3
select string.Format("{0} {1} {2} {3} {4} {5} {6} {7} {8}", i, x, y, z, a, b, c, d, f)
).Body;
var converter = new EnumerableToQueryTreeConverter();
var q = converter.Convert(e);
var l = new LetOptimizer();
var o = l.Optimize(q);
var r = o.Reduce();
var counter = new SelectCountingVisitor();
counter.Visit(r);
Assert.AreEqual(2, counter.Count); // one for the coalesced let and one for the final select
Assert.AreEqual(e.Funcletize <IEnumerable <string> >().Compile()().First(), r.Funcletize <IEnumerable <string> >().Compile()().First());
}
{
var e =
Infer(() =>
from p in Enumerable.Repeat(new Person {
Name = "Bob", Age = 25
}, 1)
let n = p.Name
let a = p.Age
select n + " is " + a
).Body;
var converter = new EnumerableToQueryTreeConverter();
var q = converter.Convert(e);
var l = new LetOptimizer();
var o = l.Optimize(q);
var r = o.Reduce();
var counter = new SelectCountingVisitor();
counter.Visit(r);
Assert.AreEqual(2, counter.Count); // one for the coalesced let and one for the final select
Assert.AreEqual(e.Funcletize <IEnumerable <string> >().Compile()().First(), r.Funcletize <IEnumerable <string> >().Compile()().First());
}
{
var e =
Infer(() =>
from p in Enumerable.Repeat(new Person {
Name = "Alice", Age = 30
}, 1)
let n = p.Name
let s = n.Length
select n + ".Length = " + s
).Body;
var converter = new EnumerableToQueryTreeConverter();
var q = converter.Convert(e);
var l = new LetOptimizer();
var o = l.Optimize(q);
var r = o.Reduce();
var counter = new SelectCountingVisitor();
counter.Visit(r);
Assert.AreEqual(3, counter.Count); // The let bindings can't be coalesced since the second one refers to the first
Assert.AreEqual(e.Funcletize <IEnumerable <string> >().Compile()().First(), r.Funcletize <IEnumerable <string> >().Compile()().First());
}
}
public void LetCoalescer_VariableMasking()
{
var select = ((MethodInfo)ReflectionHelpers.InfoOf((IEnumerable <int> xs) => xs.Select(x => x))).GetGenericMethodDefinition();
{
//Enumerable
// .Range(0, 1)
// .Select(x => new { i = 1 })
// .Select(y => new { A = y, b = (('a y) => y.i)(new { i = 2 }) })
#pragma warning disable IDE0050 // Convert to tuple. (Test for anonymous types.)
var a = new { i = 1 };
var b = new { A = a, b = 1 };
var t = a.GetType();
var u = b.GetType();
#pragma warning restore IDE0050
var s = Infer(() => Enumerable.Range(0, 1)).Body;
var x = Expression.Parameter(typeof(int));
var y = Expression.Parameter(t);
var e =
Expression.Call(
select.MakeGenericMethod(new[] { t, u }),
Expression.Call(
select.MakeGenericMethod(new[] { typeof(int), t }),
s,
Expression.Lambda(
Expression.New(
t.GetConstructors().Single(),
new[] { Expression.Constant(1) },
t.GetMember("i").Single()
),
x
)
),
Expression.Lambda(
Expression.New(
u.GetConstructors().Single(),
new Expression[]
{
y,
Expression.Invoke(
Expression.Lambda(Expression.MakeMemberAccess(y, t.GetMember("i").Single()), y),
Expression.New(
t.GetConstructors().Single(),
new[] { Expression.Constant(2) },
t.GetMember("i").Single()
)
)
},
u.GetMember("A").Single(),
u.GetMember("b").Single()
),
y
)
);
var converter = new EnumerableToQueryTreeConverter();
var q = converter.Convert(e);
var l = new LetOptimizer();
var o = l.Optimize(q);
var r = o.Reduce();
var counter = new SelectCountingVisitor();
counter.Visit(r);
Assert.AreEqual(1, counter.Count); // one for the coalesced let and one for the final select
Assert.AreEqual(e.Funcletize <IEnumerable <object> >().Compile()().First(), r.Funcletize <IEnumerable <object> >().Compile()().First());
}
{
//Enumerable
// .Range(0, 1)
// .Select(x => new { i = 1 })
// .Select(y => new { A = y, b = (('a z) => z.i)(new { i = 2 }) })
#pragma warning disable IDE0050 // Convert to tuple. (Test for anonymous types.)
var a = new { i = 1 };
var b = new { A = a, b = 1 };
var t = a.GetType();
var u = b.GetType();
#pragma warning restore IDE0050
var s = Infer(() => Enumerable.Range(0, 1)).Body;
var x = Expression.Parameter(typeof(int));
var y = Expression.Parameter(t);
var z = Expression.Parameter(t);
var e =
Expression.Call(
select.MakeGenericMethod(new[] { t, u }),
Expression.Call(
select.MakeGenericMethod(new[] { typeof(int), t }),
s,
Expression.Lambda(
Expression.New(
t.GetConstructors().Single(),
new[] { Expression.Constant(1) },
t.GetMember("i").Single()
),
x
)
),
Expression.Lambda(
Expression.New(
u.GetConstructors().Single(),
new Expression[]
{
y,
Expression.Invoke(
Expression.Lambda(Expression.MakeMemberAccess(z, t.GetMember("i").Single()), z),
Expression.New(
t.GetConstructors().Single(),
new[] { Expression.Constant(2) },
t.GetMember("i").Single()
)
)
},
u.GetMember("A").Single(),
u.GetMember("b").Single()
),
y
)
);
var converter = new EnumerableToQueryTreeConverter();
var q = converter.Convert(e);
var l = new LetOptimizer();
var o = l.Optimize(q);
var r = o.Reduce();
var counter = new SelectCountingVisitor();
counter.Visit(r);
Assert.AreEqual(1, counter.Count); // one for the coalesced let and one for the final select
Assert.AreEqual(e.Funcletize <IEnumerable <object> >().Compile()().First(), r.Funcletize <IEnumerable <object> >().Compile()().First());
}
{
//Enumerable
// .Range(0, 1)
// .Select(x => new { i = 1 })
// .Select(y => (('a y) => y.i)(new { i = y.i + 1 }))
var a = new { i = 1 };
var t = a.GetType();
var s = Infer(() => Enumerable.Range(0, 1)).Body;
var x = Expression.Parameter(typeof(int));
var y = Expression.Parameter(t);
var e =
Expression.Call(
select.MakeGenericMethod(new[] { t, typeof(int) }),
Expression.Call(
select.MakeGenericMethod(new[] { typeof(int), t }),
s,
Expression.Lambda(
Expression.New(
t.GetConstructors().Single(),
new[] { Expression.Constant(1) },
t.GetMember("i").Single()
),
x
)
),
Expression.Lambda(
Expression.Invoke(
Expression.Lambda(Expression.MakeMemberAccess(y, t.GetMember("i").Single()), y),
Expression.New(
t.GetConstructors().Single(),
new[] { Expression.Add(Expression.MakeMemberAccess(y, t.GetMember("i").Single()), Expression.Constant(1)) },
t.GetMember("i").Single()
)
),
y
)
);
var converter = new EnumerableToQueryTreeConverter();
var q = converter.Convert(e);
var l = new LetOptimizer();
var o = l.Optimize(q);
var r = o.Reduce();
var counter = new SelectCountingVisitor();
counter.Visit(r);
Assert.AreEqual(2, counter.Count); // one for the coalesced let and one for the final select
Assert.AreEqual(e.Funcletize <IEnumerable <int> >().Compile()().First(), r.Funcletize <IEnumerable <int> >().Compile()().First());
}
}