public void GotoLabel()
{
var provider = new ReflectionProvider();
var assemblyBuilder = new EmitAssemblyBuilder("TestAssembly");
var typeBuilder = assemblyBuilder.DefineType("", "TestClass");
var method = typeBuilder.DefineMethod("Foo", typeof(string));
var variable = method.Il.DeclareLocal(typeof(int));
var label = method.Il.DefineLabel();
method.Il.Emit(Ldc_I4_0);
method.Il.Emit(Stloc, variable);
method.Il.MarkLabel(label);
method.Il.Emit(Ldloc, variable);
method.Il.Emit(Ldc_I4_1);
method.Il.Emit(Add);
method.Il.Emit(Dup);
method.Il.Emit(Stloc, variable);
method.Il.Emit(Ldc_I4_5);
method.Il.Emit(Blt, label);
method.Il.Emit(Ldloc, variable);
method.Il.Emit(Ret);
var type = provider.Compile(assemblyBuilder).GetType("TestClass");
var instance = Activator.CreateInstance(type);
var methodInfo = type.GetMethod("Foo");
var result = (int)methodInfo.Invoke(instance, null);
Assert.AreEqual(5, result);
}
public void ClassExtendsBaseType()
{
var provider = new ReflectionProvider();
var assemblyBuilder = new EmitAssemblyBuilder("TestAssembly");
var typeBuilder = assemblyBuilder.DefineType("", "TestClass", baseType: typeof(CustomBaseType));
var method = typeBuilder.DefineMethod("Foo", typeof(void), EmitVisibility.Public, isStatic: true);
method.Il.Emit(EmitOpCodes.Ret);
var type = provider.Compile(assemblyBuilder).GetType("TestClass");
Assert.IsTrue(typeof(CustomBaseType).IsAssignableFrom(type));
}
public void ProtectedMethodIsProtected()
{
var provider = new ReflectionProvider();
var assemblyBuilder = new EmitAssemblyBuilder("TestAssembly");
var typeBuilder = assemblyBuilder.DefineType("", "TestClass");
var method = typeBuilder.DefineMethod("Foo", typeof(void), EmitVisibility.Protected);
method.Il.Emit(EmitOpCodes.Ret);
var type = provider.Compile(assemblyBuilder).GetType("TestClass");
var methodInfo = type.GetMethod("Foo", BindingFlags.NonPublic | BindingFlags.Instance);
Assert.IsTrue((methodInfo.Attributes & MethodAttributes.Family) == MethodAttributes.Family);
}
public void MethodReturnsString()
{
var provider = new ReflectionProvider();
var assemblyBuilder = new EmitAssemblyBuilder("TestAssembly");
var typeBuilder = assemblyBuilder.DefineType("", "TestClass");
var method = typeBuilder.DefineMethod("Foo", typeof(string));
method.Il.Emit(EmitOpCodes.Ldstr, "bar");
method.Il.Emit(EmitOpCodes.Ret);
var type = provider.Compile(assemblyBuilder).GetType("TestClass");
var instance = Activator.CreateInstance(type);
var methodInfo = type.GetMethod("Foo");
var result = (string)methodInfo.Invoke(instance, null);
Assert.AreEqual("bar", result);
}
public void DeclareVariable()
{
var provider = new ReflectionProvider();
var assemblyBuilder = new EmitAssemblyBuilder("TestAssembly");
var typeBuilder = assemblyBuilder.DefineType("", "TestClass");
var method = typeBuilder.DefineMethod("Foo", typeof(string));
var variable = method.Il.DeclareLocal(typeof(string));
method.Il.Emit(Ldstr, "bar");
method.Il.Emit(Stloc, variable);
method.Il.Emit(Ldloc, variable);
method.Il.Emit(Ret);
var type = provider.Compile(assemblyBuilder).GetType("TestClass");
var instance = Activator.CreateInstance(type);
var methodInfo = type.GetMethod("Foo");
var result = (string)methodInfo.Invoke(instance, null);
Assert.AreEqual("bar", result);
}
public void SetAndGetValueFromField()
{
var provider = new ReflectionProvider();
var assemblyBuilder = new EmitAssemblyBuilder("TestAssembly");
var typeBuilder = assemblyBuilder.DefineType("", "TestClass");
typeBuilder.DefineField("foo", typeof(string));
var type = provider.Compile(assemblyBuilder).GetType("TestClass");
var instance = Activator.CreateInstance(type);
var field = type.GetField("foo");
Assert.IsNull(field.GetValue(instance));
field.SetValue(instance, "bar");
Assert.AreEqual("bar", field.GetValue(instance));
}
public void StaticMethodIsStatic()
{
var provider = new ReflectionProvider();
var assemblyBuilder = new EmitAssemblyBuilder("TestAssembly");
var typeBuilder = assemblyBuilder.DefineType("", "TestClass");
var method = typeBuilder.DefineMethod("Foo", typeof(void), EmitVisibility.Public, isStatic: true);
method.Il.Emit(EmitOpCodes.Ret);
var type = provider.Compile(assemblyBuilder).GetType("TestClass");
var methodInfo = type.GetMethod("Foo");
Assert.IsTrue(methodInfo.IsStatic);
}
public void StaticFieldIsStatic()
{
var provider = new ReflectionProvider();
var assemblyBuilder = new EmitAssemblyBuilder("TestAssembly");
var typeBuilder = assemblyBuilder.DefineType("", "TestClass");
typeBuilder.DefineField("foo", typeof(string), isStatic: true);
var type = provider.Compile(assemblyBuilder).GetType("TestClass");
var field = type.GetField("foo");
Assert.IsTrue(field.IsStatic);
}
private MethodInfo CreateMethod(Action<EmitBlockStatement> ilGenerator, Type baseType = null, Action<EmitMethodBuilder> methodInstrumenter = null)
{
var provider = new ReflectionProvider();
var assemblyBuilder = new EmitAssemblyBuilder("MethodAssembly");
var typeBuilder = assemblyBuilder.DefineType("", "Method");
var method = typeBuilder.DefineMethod("Foo", typeof(object), isStatic: true);
methodInstrumenter?.Invoke(method);
var block = method.Body;
ilGenerator(block);
var assembly = provider.Compile(assemblyBuilder);
var type = assembly.GetType(typeBuilder.FullName);
var methodInfo = type.GetMethod("Foo");
return methodInfo;
}