[Mono-list] Doubt in Reflection.Emit

[Ben Maurer]

ldarg.0 is the implict `this' pointer for any instance method. Take a
look at the code mcs generates for something like

class T {
    void Foo () { Bar (); }
    void Bar () {}
    static void Main () { new T ().Foo (); }
}

>>> mono devel <nvineeth_mono@yahoo.com> 03/09/04 09:40 AM >>>
hello,
	I have doubt in Reflection.Emit.Opcodes.
I have noticed that before setting a variable , or
calling a function 
Opcodes.ldarg_0 is always emitted. 
I want to know if ldarg_0 contains a reference to
current object(something like "this" pointer) ::
The example i came accross is as follows ( i have
marked the lines which do this )::

       FieldBuilder xField =
pointTypeBld.DefineField("x", typeof(int),
                                                     
FieldAttributes.Public);
       FieldBuilder yField =
pointTypeBld.DefineField("y", typeof(int), 
                                                     
FieldAttributes.Public);


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

       ConstructorBuilder pointCtor =
pointTypeBld.DefineConstructor(
                                   
MethodAttributes.Public,
                                  
CallingConventions.Standard,
                                   ctorParams);
       ILGenerator ctorIL =
pointCtor.GetILGenerator();


       // First, you build the constructor.
       ctorIL.Emit(OpCodes.Ldarg_0);//<--Here####
       ctorIL.Emit(OpCodes.Call, objCtor);//objCtor is
the constructor of System.Object;
       ctorIL.Emit(OpCodes.Ldarg_0);//<--Here#######
       ctorIL.Emit(OpCodes.Ldarg_1);
       ctorIL.Emit(OpCodes.Stfld, xField); 
       ctorIL.Emit(OpCodes.Ldarg_0);//<--Here#####
       ctorIL.Emit(OpCodes.Ldarg_2);
       ctorIL.Emit(OpCodes.Stfld, yField); 
       ctorIL.Emit(OpCodes.Ret);
 //--------------------------------
 can someone please rectify this doubt.
 thanks,
 vineeth



=====
vineeth N

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