the C# call
Math.Pow(2,3);
in ILDASM:
ldc.r8 2.
ldc.r8 3.
call float64[mscorlib]System.Math::Pow(float64, float64)
Can someone please tell me how to emit that call statement via an ILGenerator ? Thanks.
Here's an example of building a dynamic method that will call the static Math.Pow(double, double)
method:
using System;
using System.Linq;
using System.Reflection.Emit;
class Program
{
static void Main()
{
// define the signature of the dynamic method
var powIt = new DynamicMethod(
"PowIt",
typeof(double),
new Type[] { typeof(double), typeof(double) },
typeof(Program).Module
);
// get a MethodInfo pointer to the Math.Pow(double, double) static
// method that we are willing to use in our dynamic method
var pow = typeof(Math).GetMethod("Pow", new[] { typeof(double), typeof(double) });
var il = powIt.GetILGenerator();
// Push the first argument onto the evaluation stack
il.Emit(OpCodes.Ldarg_0);
// Push the second argument onto the evaluation stack
il.Emit(OpCodes.Ldarg_1);
// Invoke the Math.Pow static method that we obtained a MethodInfo earlier
// by passing the two arguments that are on the evaluation stack
il.Emit(OpCodes.Call, pow);
// Return from the method pushing a return value from the callee's evaluation stack onto the caller's evaluation stack
il.Emit(OpCodes.Ret);
// build a delegate from the dynamic method
var func = (Func<double, double, double>)powIt.CreateDelegate(typeof(Func<double, double, double>));
// Now invoke the delegate
Console.WriteLine(func(2, 3));
}
}
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