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using System;
using System.Linq;
using Mono.Cecil;
using Mono.Cecil.Cil;
using NUnit.Framework;
namespace Mono.Cecil.Tests {
[TestFixture]
public class ILProcessorTests : BaseTestFixture {
[Test]
public void Append ()
{
var method = CreateTestMethod ();
var il = method.GetILProcessor ();
var ret = il.Create (OpCodes.Ret);
il.Append (ret);
AssertOpCodeSequence (new [] { OpCodes.Ret }, method);
}
[Test]
public void InsertBefore ()
{
var method = CreateTestMethod (OpCodes.Ldloc_0, OpCodes.Ldloc_2, OpCodes.Ldloc_3);
var il = method.GetILProcessor ();
var ldloc_2 = method.Instructions.Where (i => i.OpCode == OpCodes.Ldloc_2).First ();
il.InsertBefore (
ldloc_2,
il.Create (OpCodes.Ldloc_1));
AssertOpCodeSequence (new [] { OpCodes.Ldloc_0, OpCodes.Ldloc_1, OpCodes.Ldloc_2, OpCodes.Ldloc_3 }, method);
}
[Test]
public void InsertAfter ()
{
var method = CreateTestMethod (OpCodes.Ldloc_0, OpCodes.Ldloc_2, OpCodes.Ldloc_3);
var il = method.GetILProcessor ();
var ldloc_0 = method.Instructions.First ();
il.InsertAfter (
ldloc_0,
il.Create (OpCodes.Ldloc_1));
AssertOpCodeSequence (new [] { OpCodes.Ldloc_0, OpCodes.Ldloc_1, OpCodes.Ldloc_2, OpCodes.Ldloc_3 }, method);
}
static void AssertOpCodeSequence (OpCode [] expected, MethodBody body)
{
var opcodes = body.Instructions.Select (i => i.OpCode).ToArray ();
Assert.AreEqual (expected.Length, opcodes.Length);
for (int i = 0; i < opcodes.Length; i++)
Assert.AreEqual (expected [i], opcodes [i]);
}
static MethodBody CreateTestMethod (params OpCode [] opcodes)
{
var method = new MethodDefinition {
Name = "function",
};
var il = method.Body.GetILProcessor ();
foreach (var opcode in opcodes)
il.Emit (opcode);
return method.Body;
}
}
}
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