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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 CallTests
{
private struct Mutable
{
private int x;
public int X
{
get { return x; }
set { x = value; }
}
public int this[int i]
{
get { return x; }
set { x = value; }
}
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; }
}
}
private static class Methods
{
public static void ByRef(ref int x) { ++x; }
}
[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());
}
[Theory]
[ClassData(typeof(CompilationTypes))]
public static void CallByRefMutableStructPropertyWriteBack(bool useInterpreter)
{
var p = Expression.Parameter(typeof(Mutable));
var x = Expression.Property(p, "X");
var call = Expression.Call(typeof(Methods).GetMethod("ByRef"), x);
var body = Expression.Block(call, x);
var lambda = Expression.Lambda<Func<Mutable, int>>(body, p).Compile(useInterpreter);
var m = new Mutable() { X = 41 };
Assert.Equal(42, lambda(m));
}
[Theory]
[ClassData(typeof(CompilationTypes))]
public static void CallByRefMutableStructIndexWriteBack(bool useInterpreter)
{
var p = Expression.Parameter(typeof(Mutable));
var x = Expression.MakeIndex(p, typeof(Mutable).GetProperty("Item"), new[] { Expression.Constant(0) });
var call = Expression.Call(typeof(Methods).GetMethod("ByRef"), x);
var body = Expression.Block(call, x);
var lambda = Expression.Lambda<Func<Mutable, int>>(body, p).Compile(useInterpreter);
var m = new Mutable() { X = 41 };
Assert.Equal(42, lambda(m));
}
}
}
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