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//
// MethodBuilderTestIL.cs - NUnit Test Cases for MethodBuilder.CreateMethodBody and MethodBuilder.SetMethodBody
//
// Marcos Henrich (marcos.henrich@xamarin.com)
//
// (C) Xamarin, Inc.
using System;
using System.Linq;
using System.Reflection;
using System.Reflection.Emit;
using System.Threading;
using NUnit.Framework;
using System.IO;
namespace MonoTests.System.Reflection.Emit
{
public abstract class MethodBuilderTestIL
{
protected abstract void SetIL (MethodBuilder methodBuilder, MemoryStream ilStream);
public static ModuleBuilder CreateModuleBuilder ()
{
AppDomain currentDom = Thread.GetDomain ();
AssemblyBuilder assemblyBuilder = currentDom.DefineDynamicAssembly (
new AssemblyName ("NewDynamicAssembly"),
AssemblyBuilderAccess.Run);
return assemblyBuilder.DefineDynamicModule ("NewModule");
}
public static object Invoke (Type type, MethodBuilder methodBuilder, params object[] parameters)
{
var method = type.GetMethods ().First (m => {
if (m.Name != methodBuilder.Name)
return false;
var params1 = m.GetParameters ();
var params2 = methodBuilder.GetParameters ();
if (params1.Length != params2.Length)
return false;
for (var i = 0; i < params1.Length; i++)
if (params1 [i].ParameterType.FullName != params2 [i].ParameterType.FullName)
return false;
return true;
});
object inst = Activator.CreateInstance (type, new object [0]);
return method.Invoke (inst, parameters);
}
[Test]
public void CallMethodRef ()
{
var expected = "value";
var moduleBuilder = CreateModuleBuilder ();
var typeBuilder = moduleBuilder.DefineType ("NewType");
var methodBuilder1 = typeBuilder.DefineMethod ("NewMethod1",
MethodAttributes.Public | MethodAttributes.Static,
typeof (string),
Type.EmptyTypes);
var gen1 = methodBuilder1.GetILGenerator ();
gen1.Emit (OpCodes.Ldstr, expected);
gen1.Emit (OpCodes.Ret);
var methodBuilder2 = typeBuilder.DefineMethod ("NewMethod2",
MethodAttributes.Public | MethodAttributes.Static,
typeof (string),
Type.EmptyTypes);
var ilStream = new MemoryStream ();
var ilWriter = new BinaryWriter (ilStream);
ilWriter.Write ((byte) 0x28); // call
ilWriter.Write ((int) moduleBuilder.GetMethodToken (methodBuilder1).Token);
ilWriter.Write ((byte) 0x2A); // ret
SetIL (methodBuilder2, ilStream);
var type = typeBuilder.CreateType ();
Assert.AreEqual (expected, Invoke (type, methodBuilder2));
}
[Test]
public void CallMethodDef ()
{
var expected = "value";
var moduleBuilder1 = CreateModuleBuilder ();
var typeBuilder1 = moduleBuilder1.DefineType ("NewType1", TypeAttributes.Public);
var methodBuilder1 = typeBuilder1.DefineMethod ("NewMethod1",
MethodAttributes.Public | MethodAttributes.Static,
typeof (string),
Type.EmptyTypes);
var gen1 = methodBuilder1.GetILGenerator ();
gen1.Emit (OpCodes.Ldstr, expected);
gen1.Emit (OpCodes.Ret);
typeBuilder1.CreateType ();
var moduleBuilder2 = CreateModuleBuilder ();
var typeBuilder2 = moduleBuilder2.DefineType ("NewType2");
var methodBuilder2 = typeBuilder2.DefineMethod ("NewMethod2",
MethodAttributes.Public | MethodAttributes.Static,
typeof (string),
Type.EmptyTypes);
var ilStream = new MemoryStream ();
var ilWriter = new BinaryWriter (ilStream);
ilWriter.Write ((byte) 0x28); // call
ilWriter.Write ((int) moduleBuilder2.GetMethodToken (methodBuilder1).Token);
ilWriter.Write ((byte) 0x2A); // ret
SetIL (methodBuilder2, ilStream);
var type = typeBuilder2.CreateType ();
Assert.AreEqual (expected, Invoke (type, methodBuilder2));
}
}
/*
* Tests MethodBuilder.CreateMethodBody
*/
[TestFixture]
public class MethodBuilderTestIL_CreateMethodBody : MethodBuilderTestIL
{
protected override void SetIL (MethodBuilder methodBuilder, MemoryStream ilStream)
{
methodBuilder.CreateMethodBody (ilStream.ToArray (), (int) ilStream.Length);
}
}
/*
* Tests MethodBuilder.SetMethodBody
*/
[TestFixture]
public class MethodBuilderTestIL_SetMethodBody : MethodBuilderTestIL
{
protected override void SetIL (MethodBuilder methodBuilder, MemoryStream ilStream)
{
methodBuilder.SetMethodBody (ilStream.ToArray (), 999, null, null, null);
}
}
}
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