In the preceding C# code, I’m creating a dynamic method and adding a few IL instructions to it, and then invoking the dynamic method:
var assemblyBuilder = AssemblyBuilder.DefineDynamicAssembly(new("_"), AssemblyBuilderAccess.Run);
var module = assemblyBuilder.DefineDynamicModule("_._");
var type = module.DefineType("Foo");
var method = type.DefineMethod(
name: "Bar",
attributes: MethodAttributes.Public | MethodAttributes.Static,
returnType: typeof(string),
parameterTypes: null
);
var ilGen = method.GetILGenerator();
ilGen.DeclareLocal(typeof(string));
ilGen.Emit(OpCodes.Ldstr, "Hello, World!");
ilGen.Emit(OpCodes.Stloc_0);
ilGen.Emit(OpCodes.Ldloc_0); // string str1 = "Hello, World!";
ilGen.Emit(OpCodes.Dup); // string str2 = "Hello, World!";
ilGen.EmitCall(
OpCodes.Call,
typeof(Console).GetMethod("WriteLine", types: new[] { typeof(string) })!,
optionalParameterTypes: null
); // Console.WriteLine(str1);
ilGen.Emit(OpCodes.Ret); // return str2;
var nonDynamicType = type.CreateType();
var createdMethod = nonDynamicType!.GetMethod("Bar")!;
object? result = createdMethod.Invoke(null, null);
Console.WriteLine($"Method returned {result}");
It works fine – as expected, I see the following in the console:
Hello, World!
Method returned Hello, World!
Now, I would like to execute IL instructions one-by-one. With the approach above, I execute all IL instructions at once; is it possible to execute only one instruction, and then (perhaps later) manually execute another in the same dynamic method while keeping all local variables and the stack/heap same (and then only return from method once the ret
IL instruction is executed)?
3