private static MethodInfo GetCustomFunc <T1, T2, T3>(Func <T1, T2, T3> target)
{
var method = target.Method;
var body = method.GetMethodBody();
var locals = body.LocalVariables.OrderBy(x => x.LocalIndex).ToList();
var resolver = new ILInstructionResolver(method);
switch (method.Name)
{
case nameof(TestMethods.Add_Ovf):
case nameof(TestMethods.Add_Ovf_Un):
{
var instructions = ILInstructionReader.FromMethod(method);
var parsed = Enum.TryParse <ILOpCodeValues>(method.Name, out ILOpCodeValues result);
var opCode = OpCodeLookup.GetILOpcode((int)result);
instructions[2] = new ILInstruction()
{
OpCode = opCode
};
var compiled = ILEngineOpCodeTestMethodCompiler.CompileMethod(opCode, method, (gen) =>
{
locals.ForEach(x => gen.DeclareLocal(x.LocalType));
instructions.ForEach(x => x.Emit(gen, resolver));
});
return(method);
}
default: throw new NotImplementedException();
}
}
protected ILOpCodeValues[] CompileAndRun <T>(OpCode opCode, MethodInfo srcMethod, T expected, object[] parameters, Func <T, T, bool> comparer)
{
var methodParameters = srcMethod.GetParameters();
var body = srcMethod.GetMethodBody();
var locals = body.LocalVariables.OrderBy(x => x.LocalIndex).ToList();
var parameterTypes = methodParameters.Select(x => x.ParameterType).ToArray();
var instructions = ILInstructionReader.FromMethod(srcMethod);
if (opCode != OpCodes.Arglist)
{
Assert.IsTrue(instructions.Any(x => x.OpCode == opCode), $"Opcode {opCode} missing from compiled method");
}
var result = ILInstructionReader
.FromMethod(srcMethod)
.Select(x => (ILOpCodeValues)x.OpCode.Value).ToArray();
var resolver = new ILInstructionResolver(srcMethod);
Action <ILGenerator> emitAction = (gen) =>
{
locals.ForEach(x => gen.DeclareLocal(x.LocalType));
instructions.ForEach(x => x.Emit(gen, resolver));
};
MethodInfo method = null;
try
{
method = ILEngineOpCodeTestMethodCompiler.CompileMethod(opCode, typeof(T), parameterTypes, emitAction);
}
catch (Exception ex)
{
Assert.Fail("Failed to compile method:", ex.Message);
return(null);
}
return(RunAndTest <T>(method, expected, parameters, comparer));
}