// File RTCG7.cs --- measure time to generate (much) code
// sestoft@itu.dk * 2002-09

using System;
using System.Reflection;
using System.Reflection.Emit;

class RTCG7 {
  public static void Main(String [] args) {
    int count = int.Parse(args[0]);
    int calls = int.Parse(args[1]);
    AssemblyName assemblyName = new AssemblyName();
    assemblyName.Name = "myassembly";
    // Build: run-only assembly
    AssemblyBuilder assemblyBuilder = 
      AppDomain.CurrentDomain.DefineDynamicAssembly(assemblyName,
                                                    AssemblyBuilderAccess.Run);
    // Build: module mymodule
    ModuleBuilder moduleBuilder = 
      assemblyBuilder.DefineDynamicModule("mymodule");
    // Build: public class MyClass { ... }
    TypeBuilder typeBuilder = 
      moduleBuilder.DefineType("MyClass", 
                               TypeAttributes.Class | TypeAttributes.Public, 
                               typeof(Object));
    Timer t1 = new Timer();
    {
      // Build: public static void MyMethod1(int x) { ... }
      MethodBuilder methodBuilder =
        typeBuilder.DefineMethod("MyMethod1", 
                                 MethodAttributes.Static | MethodAttributes.Public,
                                 typeof(void),
                                 new Type[] { typeof(int) });
      // Obtain an IL generator to build the method body
      ILGenerator ilg = methodBuilder.GetILGenerator();
      ilg.Emit(OpCodes.Ldarg_0);
      ilg.Emit(OpCodes.Ldc_I4_1);
      ilg.Emit(OpCodes.Add);
      for (int i=count; i>0; i--) {
  	ilg.Emit(OpCodes.Ldarg_0);
  	ilg.Emit(OpCodes.Add);
      }
      ilg.Emit(OpCodes.Pop);  
      ilg.Emit(OpCodes.Ret);  
    }
    Type ty = typeBuilder.CreateType();
    for (int i=calls; i>0; i--) {
      ty.GetMethod("MyMethod1").Invoke(null, new object[] { count });
    }
    Console.WriteLine("Generation and " + calls + " calls: " 
		      + t1.Check() + " sec");
  }
}

// Crude timing utility ----------------------------------------
   
public class Timer {
  private DateTime start;

  public Timer() {
    start = DateTime.Now;
  }

  public double Check() {
    TimeSpan dur = DateTime.Now - start;
    return dur.TotalSeconds;
  }
}