Question

I have metaprogramm, that needs to create code for initializing value fields.
I.e. have class

class Class1
{
    int i;
    double t;
    Class1()
    {
       i=5;
       t=3;
    }
} 

In reflection this looks like follow:

...
gen.Emit(OpCodes.Ldc_I4,5);
...
gen.Emit(OpCodes.Ldc_R8,3);
...

I don’t want to have a huge switch like this:

switch(t)
{
case typeof(int): gen.Emit(OpCode.Ldc_I4,value); break;
case typeof(double): gen.Emit(OpCodes.Ldc_R8,value); break;
// and so on for all value types
}

Is there some universal load value on evaluation stack OpCode? Or I need to have switch mentioned above?

Answer 1

Both fields and local variables start at zero by default, so you likely don’t need this.

For setting a variable to its default value, you can use ldloca <variable> followed by initobj <type>.
initobj is normally used for structs (default(MyStruct) in C#), but it should also work for primitive types.