MethodBuilder.GetILGenerator-Methode (Int32)

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


class TestILGenerator {

  	public static Type DynamicDotProductGen() {
	  
	   Type ivType = null;
	   Type[] ctorParams = new Type[] { typeof(int),
		               		    typeof(int),
					    typeof(int)};
 	
	   AppDomain myDomain = Thread.GetDomain();
	   AssemblyName myAsmName = new AssemblyName();
	   myAsmName.Name = "IntVectorAsm";
	
	   AssemblyBuilder myAsmBuilder = myDomain.DefineDynamicAssembly(
					  myAsmName, 
					  AssemblyBuilderAccess.RunAndSave);

   	   ModuleBuilder IntVectorModule = myAsmBuilder.DefineDynamicModule("IntVectorModule",
									    "Vector.dll");

	   TypeBuilder ivTypeBld = IntVectorModule.DefineType("IntVector",
						              TypeAttributes.Public);

	   FieldBuilder xField = ivTypeBld.DefineField("x", typeof(int),
                                                       FieldAttributes.Private);
	   FieldBuilder yField = ivTypeBld.DefineField("y", typeof(int), 
                                                       FieldAttributes.Private);
	   FieldBuilder zField = ivTypeBld.DefineField("z", typeof(int),
                                                       FieldAttributes.Private);


           Type objType = Type.GetType("System.Object"); 
           ConstructorInfo objCtor = objType.GetConstructor(new Type[0]);

	   ConstructorBuilder ivCtor = ivTypeBld.DefineConstructor(
					  MethodAttributes.Public,
					  CallingConventions.Standard,
					  ctorParams);
	   ILGenerator ctorIL = ivCtor.GetILGenerator();
           ctorIL.Emit(OpCodes.Ldarg_0);
           ctorIL.Emit(OpCodes.Call, objCtor);
           ctorIL.Emit(OpCodes.Ldarg_0);
           ctorIL.Emit(OpCodes.Ldarg_1);
           ctorIL.Emit(OpCodes.Stfld, xField); 
           ctorIL.Emit(OpCodes.Ldarg_0);
           ctorIL.Emit(OpCodes.Ldarg_2);
           ctorIL.Emit(OpCodes.Stfld, yField); 
           ctorIL.Emit(OpCodes.Ldarg_0);
           ctorIL.Emit(OpCodes.Ldarg_3);
           ctorIL.Emit(OpCodes.Stfld, zField); 
	   ctorIL.Emit(OpCodes.Ret); 


	   // This method will find the dot product of the stored vector
	   // with another.

	   Type[] dpParams = new Type[] { ivTypeBld };

           // Here, you create a MethodBuilder containing the
	   // name, the attributes (public, static, private, and so on),
	   // the return type (int, in this case), and a array of Type
	   // indicating the type of each parameter. Since the sole parameter
	   // is a IntVector, the very class you're creating, you will
	   // pass in the TypeBuilder (which is derived from Type) instead of 
	   // a Type object for IntVector, avoiding an exception. 

	   // -- This method would be declared in C# as:
	   //    public int DotProduct(IntVector aVector)

           MethodBuilder dotProductMthd = ivTypeBld.DefineMethod(
	    		                  "DotProduct", 
				          MethodAttributes.Public,
                                          typeof(int), 
                                          dpParams);

	   // A ILGenerator can now be spawned, attached to the MethodBuilder.

	   ILGenerator mthdIL = dotProductMthd.GetILGenerator();
	   
 	   // Here's the body of our function, in MSIL form. We're going to find the
	   // "dot product" of the current vector instance with the passed vector 
	   // instance. For reference purposes, the equation is:
	   // (x1 * x2) + (y1 * y2) + (z1 * z2) = the dot product

	   // First, you'll load the reference to the current instance "this"
	   // stored in argument 0 (ldarg.0) onto the stack. Ldfld, the subsequent
	   // instruction, will pop the reference off the stack and look up the
	   // field "x", specified by the FieldInfo token "xField".

	   mthdIL.Emit(OpCodes.Ldarg_0);
	   mthdIL.Emit(OpCodes.Ldfld, xField);

	   // That completed, the value stored at field "x" is now atop the stack.
	   // Now, you'll do the same for the object reference we passed as a
	   // parameter, stored in argument 1 (ldarg.1). After Ldfld executed,
	   // you'll have the value stored in field "x" for the passed instance
	   // atop the stack.

	   mthdIL.Emit(OpCodes.Ldarg_1);
	   mthdIL.Emit(OpCodes.Ldfld, xField);

           // There will now be two values atop the stack - the "x" value for the
	   // current vector instance, and the "x" value for the passed instance.
	   // You'll now multiply them, and push the result onto the evaluation stack.

	   mthdIL.Emit(OpCodes.Mul_Ovf_Un);

	   // Now, repeat this for the "y" fields of both vectors.

	   mthdIL.Emit(OpCodes.Ldarg_0);
	   mthdIL.Emit(OpCodes.Ldfld, yField);
	   mthdIL.Emit(OpCodes.Ldarg_1);
	   mthdIL.Emit(OpCodes.Ldfld, yField);
	   mthdIL.Emit(OpCodes.Mul_Ovf_Un);

	   // At this time, the results of both multiplications should be atop
	   // the stack. You'll now add them and push the result onto the stack.

	   mthdIL.Emit(OpCodes.Add_Ovf_Un);

	   // Multiply both "z" field and push the result onto the stack.
	   mthdIL.Emit(OpCodes.Ldarg_0);
	   mthdIL.Emit(OpCodes.Ldfld, zField);
	   mthdIL.Emit(OpCodes.Ldarg_1);
	   mthdIL.Emit(OpCodes.Ldfld, zField);
	   mthdIL.Emit(OpCodes.Mul_Ovf_Un);

	   // Finally, add the result of multiplying the "z" fields with the
	   // result of the earlier addition, and push the result - the dot product -
	   // onto the stack.
	   mthdIL.Emit(OpCodes.Add_Ovf_Un);

	   // The "ret" opcode will pop the last value from the stack and return it
	   // to the calling method. You're all done!

	   mthdIL.Emit(OpCodes.Ret);


 	   ivType = ivTypeBld.CreateType();

	   return ivType;

 	}

	public static void Main() {
	
	   Type IVType = null;
           object aVector1 = null;
           object aVector2 = null;
	   Type[] aVtypes = new Type[] {typeof(int), typeof(int), typeof(int)};
           object[] aVargs1 = new object[] {10, 10, 10};
           object[] aVargs2 = new object[] {20, 20, 20};
	
	   // Call the  method to build our dynamic class.

	   IVType = DynamicDotProductGen();

           Console.WriteLine("---");

	   ConstructorInfo myDTctor = IVType.GetConstructor(aVtypes);
	   aVector1 = myDTctor.Invoke(aVargs1);
	   aVector2 = myDTctor.Invoke(aVargs2);

	   object[] passMe = new object[1];
           passMe[0] = (object)aVector2; 

	   Console.WriteLine("(10, 10, 10) . (20, 20, 20) = {0}",
			     IVType.InvokeMember("DotProduct",
						  BindingFlags.InvokeMethod,
						  null,
						  aVector1,
						  passMe));

	    

	   // +++ OUTPUT +++
	   // ---
	   // (10, 10, 10) . (20, 20, 20) = 600 
	    
	}

}

import System.*;
import System.Threading.*;
import System.Reflection.*;
import System.Reflection.Emit.*;

class TestILGenerator
{
   public static Type DynamicDotProductGen() 
   {
        Type ivType = null;
        Type ctorParams[] = new Type[]{int.class.ToType(),
            int.class.ToType(), int.class.ToType()};

        AppDomain myDomain = System.Threading.Thread.GetDomain();
        AssemblyName myAsmName =  new AssemblyName();
        myAsmName.set_Name("IntVectorAsm");

        AssemblyBuilder myAsmBuilder = myDomain.DefineDynamicAssembly
            (myAsmName, AssemblyBuilderAccess.RunAndSave);

        ModuleBuilder IntVectorModule = myAsmBuilder.DefineDynamicModule
            ("IntVectorModule", "Vector.dll");

        TypeBuilder ivTypeBld = IntVectorModule.DefineType("IntVector",
            TypeAttributes.Public);

        FieldBuilder xField = ivTypeBld.DefineField("x",
            int.class.ToType(), FieldAttributes.Private);
        FieldBuilder yField = ivTypeBld.DefineField("y",
            int.class.ToType(), FieldAttributes.Private);
        FieldBuilder zField = ivTypeBld.DefineField("z",
            int.class.ToType(), FieldAttributes.Private);

        Type objType = Type.GetType("System.Object");
        ConstructorInfo objCtor = objType.GetConstructor(new Type[0]);
        ConstructorBuilder ivCtor = 
            ivTypeBld.DefineConstructor(MethodAttributes.Public,
            CallingConventions.Standard, ctorParams);

        ILGenerator ctorIL = ivCtor.GetILGenerator();

        ctorIL.Emit(OpCodes.Ldarg_0);
        ctorIL.Emit(OpCodes.Call, objCtor);
        ctorIL.Emit(OpCodes.Ldarg_0);
        ctorIL.Emit(OpCodes.Ldarg_1);
        ctorIL.Emit(OpCodes.Stfld, xField);
        ctorIL.Emit(OpCodes.Ldarg_0);
        ctorIL.Emit(OpCodes.Ldarg_2);
        ctorIL.Emit(OpCodes.Stfld, yField);
        ctorIL.Emit(OpCodes.Ldarg_0);
        ctorIL.Emit(OpCodes.Ldarg_3);
        ctorIL.Emit(OpCodes.Stfld, zField);
        ctorIL.Emit(OpCodes.Ret);

        // This method will find the dot product of the stored vector
        // with another.
        Type dpParams[] = new Type[]{ivTypeBld};

        // Here, you create a MethodBuilder containing the
        // name, the attributes (public, static, private, and so on),
        // the return type (int, in this case), and a array of Type
        // indicating the type of each parameter. Since the sole parameter
        // is a IntVector, the very class you're creating, you will
        // pass in the TypeBuilder (which is derived from Type) instead of 
        // a Type object for IntVector, avoiding an exception. 
        // -- This method would be declared in VJ# as:
        //    public int DotProduct(IntVector aVector)
        MethodBuilder dotProductMthd = ivTypeBld.DefineMethod("DotProduct",
            MethodAttributes.Public, int .class.ToType(), dpParams);

        // A ILGenerator can now be spawned, attached to the MethodBuilder.
        ILGenerator mthdIL = dotProductMthd.GetILGenerator();

        // Here's the body of our function, in MSIL form. We're going to 
        // find the "dot product" of the current vector instance with the 
        // passed vector instance. For reference purposes, the equation is:
        // (x1 * x2) + (y1 * y2) + (z1 * z2) = the dot product
        // First, you'll load the reference to the current instance "this"
        // stored in argument 0 (ldarg.0) onto the stack. Ldfld, the 
        // subsequent instruction, will pop the reference off the stack and 
        // look up the field "x",specified by the FieldInfo token "xField".
        mthdIL.Emit(OpCodes.Ldarg_0);
        mthdIL.Emit(OpCodes.Ldfld, xField);

        // That completed, the value stored at field "x" is now atop the 
        // stack.Now, you'll do the same for the object reference we passed 
        // as a parameter, stored in argument 1 (ldarg.1). After Ldfld 
        // executed,you'll have the value stored in field "x" for the 
        // passed instance atop the stack.
        mthdIL.Emit(OpCodes.Ldarg_1);
        mthdIL.Emit(OpCodes.Ldfld, xField);

        // There will now be two values atop the stack - the "x" value for 
        // the current vector instance, and the "x" value for the passed 
        // instance.You'll now multiply them, and push the result onto the
        // evaluation stack.
        mthdIL.Emit(OpCodes.Mul_Ovf_Un);

        // Now, repeat this for the "y" fields of both vectors.
        mthdIL.Emit(OpCodes.Ldarg_0);
        mthdIL.Emit(OpCodes.Ldfld, yField);
        mthdIL.Emit(OpCodes.Ldarg_1);
        mthdIL.Emit(OpCodes.Ldfld, yField);
        mthdIL.Emit(OpCodes.Mul_Ovf_Un);

        // At this time, the results of both multiplications should be atop
        // the stack. You'll now add them and push the result
        // onto the stack.
        mthdIL.Emit(OpCodes.Add_Ovf_Un);

        // Multiply both "z" field and push the result onto the stack.
        mthdIL.Emit(OpCodes.Ldarg_0);
        mthdIL.Emit(OpCodes.Ldfld, zField);
        mthdIL.Emit(OpCodes.Ldarg_1);
        mthdIL.Emit(OpCodes.Ldfld, zField);
        mthdIL.Emit(OpCodes.Mul_Ovf_Un);

        // Finally, add the result of multiplying the "z" fields with the
        // result of the earlier addition, and push the result 
        // - the dot product - onto the stack.
        mthdIL.Emit(OpCodes.Add_Ovf_Un);
        // The "ret" opcode will pop the last value from the stack and 
        // return it to the calling method. You're all done!
        mthdIL.Emit(OpCodes.Ret);
        ivType = ivTypeBld.CreateType();
        return ivType ;
   } //DynamicDotProductGen

    public static void main(String[] args)
    {
        Type ivType = null;
        Object aVector1 = null;
        Object aVector2 = null;
        Type aVtypes[] = new Type[] {
            int.class.ToType(), int.class.ToType(), int.class.ToType()};
        Object aVargs1[] = new Object[] { (Int32)10, (Int32)10, (Int32)10};
        Object aVargs2[] = new Object[] { (Int32)20, (Int32)20, (Int32)20};

        // Call the  method to build our dynamic class.
        ivType = DynamicDotProductGen();
        Console.WriteLine("---");
        ConstructorInfo myDTctor = ivType.GetConstructor(aVtypes);
        aVector1 = myDTctor.Invoke(aVargs1);
        aVector2 = myDTctor.Invoke(aVargs2);
        Object passMe[] = new Object[1];
        passMe.set_Item(0, ((Object)(aVector2)));
        Console.WriteLine("(10, 10, 10) . (20, 20, 20) = {0}",
            ivType.InvokeMember("DotProduct", BindingFlags.InvokeMethod,
            null, aVector1, passMe));
    } //main
} //TestILGenerator
// +++ OUTPUT +++
// ---
// (10, 10, 10) . (20, 20, 20) = 600