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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Generic;
using System.Reflection;
using Xunit;
namespace System.Linq.Expressions.Tests
{
public static class InvocationTests
{
public delegate void X(X a);
private struct Mutable
{
private int x;
public int Foo()
{
return x++;
}
}
private class Wrapper<T>
{
public const int Zero = 0;
public T Field;
#pragma warning disable 649 // For testing purposes
public readonly T ReadOnlyField;
#pragma warning restore
public T Property
{
get { return Field; }
set { Field = value; }
}
}
[Theory]
[ClassData(typeof(CompilationTypes))]
public static void SelfApplication(bool useInterpreter)
{
// Expression<X> f = x => {};
Expression<X> f = Expression.Lambda<X>(Expression.Empty(), Expression.Parameter(typeof(X)));
var a = Expression.Lambda(Expression.Invoke(f, f));
a.Compile(useInterpreter).DynamicInvoke();
var it = Expression.Parameter(f.Type);
var b = Expression.Lambda(Expression.Invoke(Expression.Lambda(Expression.Invoke(it, it), it), f));
b.Compile(useInterpreter).DynamicInvoke();
}
[Fact]
public static void NoWriteBackToInstance()
{
new NoThread(false).DoTest();
new NoThread(true).DoTest(); // This case fails
}
public class NoThread
{
private readonly bool _preferInterpretation;
public NoThread(bool preferInterpretation)
{
_preferInterpretation = preferInterpretation;
}
public Func<NoThread, int> DoItA = (nt) =>
{
nt.DoItA = (nt0) => 1;
return 0;
};
public Action Compile()
{
var ind0 = Expression.Constant(this);
var fld = Expression.PropertyOrField(ind0, "DoItA");
var block = Expression.Block(typeof(void), Expression.Invoke(fld, ind0));
return Expression.Lambda<Action>(block).Compile(_preferInterpretation);
}
public void DoTest()
{
var act = Compile();
act();
Assert.Equal(1, DoItA(this));
}
}
private class FuncHolder
{
public Func<int> Function;
public FuncHolder()
{
Function = () =>
{
Function = () => 1;
return 0;
};
}
}
[Theory]
[ClassData(typeof(CompilationTypes))]
public static void InvocationDoesNotChangeFunctionInvoked(bool useInterpreter)
{
FuncHolder holder = new FuncHolder();
var fld = Expression.Field(Expression.Constant(holder), "Function");
var inv = Expression.Invoke(fld);
Func<int> act = (Func<int>)Expression.Lambda(inv).Compile(useInterpreter);
act();
Assert.Equal(1, holder.Function());
}
[Theory]
[ClassData(typeof(CompilationTypes))]
public static void UnboxReturnsReference(bool useInterpreter)
{
var p = Expression.Parameter(typeof(object));
var unbox = Expression.Unbox(p, typeof(Mutable));
var call = Expression.Call(unbox, typeof(Mutable).GetMethod("Foo"));
var lambda = Expression.Lambda<Func<object, int>>(call, p).Compile(useInterpreter);
object boxed = new Mutable();
Assert.Equal(0, lambda(boxed));
Assert.Equal(1, lambda(boxed));
Assert.Equal(2, lambda(boxed));
Assert.Equal(3, lambda(boxed));
}
[Theory]
[ClassData(typeof(CompilationTypes))]
public static void ArrayWriteBack(bool useInterpreter)
{
var p = Expression.Parameter(typeof(Mutable[]));
var indexed = Expression.ArrayIndex(p, Expression.Constant(0));
var call = Expression.Call(indexed, typeof(Mutable).GetMethod("Foo"));
var lambda = Expression.Lambda<Func<Mutable[], int>>(call, p).Compile(useInterpreter);
var array = new Mutable[1];
Assert.Equal(0, lambda(array));
Assert.Equal(1, lambda(array));
Assert.Equal(2, lambda(array));
}
[Theory]
[ClassData(typeof(CompilationTypes))]
public static void MultiRankArrayWriteBack(bool useInterpreter)
{
var p = Expression.Parameter(typeof(Mutable[,]));
var indexed = Expression.ArrayIndex(p, Expression.Constant(0), Expression.Constant(0));
var call = Expression.Call(indexed, typeof(Mutable).GetMethod("Foo"));
var lambda = Expression.Lambda<Func<Mutable[,], int>>(call, p).Compile(useInterpreter);
var array = new Mutable[1, 1];
Assert.Equal(0, lambda(array));
Assert.Equal(1, lambda(array));
Assert.Equal(2, lambda(array));
}
[Theory]
[ClassData(typeof(CompilationTypes))]
public static void ArrayAccessWriteBack(bool useInterpreter)
{
var p = Expression.Parameter(typeof(Mutable[]));
var indexed = Expression.ArrayAccess(p, Expression.Constant(0));
var call = Expression.Call(indexed, typeof(Mutable).GetMethod("Foo"));
var lambda = Expression.Lambda<Func<Mutable[], int>>(call, p).Compile(useInterpreter);
var array = new Mutable[1];
Assert.Equal(0, lambda(array));
Assert.Equal(1, lambda(array));
Assert.Equal(2, lambda(array));
}
[Theory]
[ClassData(typeof(CompilationTypes))]
public static void MultiRankArrayAccessWriteBack(bool useInterpreter)
{
var p = Expression.Parameter(typeof(Mutable[,]));
var indexed = Expression.ArrayAccess(p, Expression.Constant(0), Expression.Constant(0));
var call = Expression.Call(indexed, typeof(Mutable).GetMethod("Foo"));
var lambda = Expression.Lambda<Func<Mutable[,], int>>(call, p).Compile(useInterpreter);
var array = new Mutable[1, 1];
Assert.Equal(0, lambda(array));
Assert.Equal(1, lambda(array));
Assert.Equal(2, lambda(array));
}
[Theory]
[ClassData(typeof(CompilationTypes))]
public static void IndexedPropertyAccessNoWriteBack(bool useInterpreter)
{
var p = Expression.Parameter(typeof(List<Mutable>));
var indexed = Expression.Property(p, typeof(List<Mutable>).GetProperty("Item"), Expression.Constant(0));
var call = Expression.Call(indexed, typeof(Mutable).GetMethod("Foo"));
var lambda = Expression.Lambda<Func<List<Mutable>, int>>(call, p).Compile(useInterpreter);
var list = new List<Mutable> { new Mutable() };
Assert.Equal(0, lambda(list));
Assert.Equal(0, lambda(list));
}
[Theory]
[ClassData(typeof(CompilationTypes))]
public static void FieldAccessWriteBack(bool useInterpreter)
{
var p = Expression.Parameter(typeof(Wrapper<Mutable>));
var member = Expression.Field(p, typeof(Wrapper<Mutable>).GetField("Field"));
var call = Expression.Call(member, typeof(Mutable).GetMethod("Foo"));
var lambda = Expression.Lambda<Func<Wrapper<Mutable>, int>>(call, p).Compile(useInterpreter);
var wrapper = new Wrapper<Mutable>();
Assert.Equal(0, lambda(wrapper));
Assert.Equal(1, lambda(wrapper));
Assert.Equal(2, lambda(wrapper));
}
[Theory]
[ClassData(typeof(CompilationTypes))]
public static void PropertyAccessNoWriteBack(bool useInterpreter)
{
var p = Expression.Parameter(typeof(Wrapper<Mutable>));
var member = Expression.Property(p, typeof(Wrapper<Mutable>).GetProperty("Property"));
var call = Expression.Call(member, typeof(Mutable).GetMethod("Foo"));
var lambda = Expression.Lambda<Func<Wrapper<Mutable>, int>>(call, p).Compile(useInterpreter);
var wrapper = new Wrapper<Mutable>();
Assert.Equal(0, lambda(wrapper));
Assert.Equal(0, lambda(wrapper));
}
[Theory]
[ClassData(typeof(CompilationTypes))]
public static void ReadonlyFieldAccessWriteBack(bool useInterpreter)
{
var p = Expression.Parameter(typeof(Wrapper<Mutable>));
var member = Expression.Field(p, typeof(Wrapper<Mutable>).GetField("ReadOnlyField"));
var call = Expression.Call(member, typeof(Mutable).GetMethod("Foo"));
var lambda = Expression.Lambda<Func<Wrapper<Mutable>, int>>(call, p).Compile(useInterpreter);
var wrapper = new Wrapper<Mutable>();
Assert.Equal(0, lambda(wrapper));
Assert.Equal(0, lambda(wrapper));
Assert.Equal(0, lambda(wrapper));
}
[Theory]
[ClassData(typeof(CompilationTypes))]
public static void ConstFieldAccessWriteBack(bool useInterpreter)
{
var member = Expression.Field(null, typeof(Wrapper<Mutable>).GetField("Zero"));
var call = Expression.Call(member, typeof(int).GetMethod("GetType"));
var lambda = Expression.Lambda<Func<Type>>(call).Compile(useInterpreter);
var wrapper = new Wrapper<Mutable>();
Assert.Equal(typeof(int), lambda());
}
}
}
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