protected static void GenerateCodeForArgument(ILGenerator gen, CodeFlow cf, SpelNode argument, TypeDescriptor paramDesc)
{
cf.EnterCompilationScope();
argument.GenerateCode(gen, cf);
var lastDesc = cf.LastDescriptor();
if (lastDesc == null)
{
throw new InvalidOperationException("No last descriptor");
}
var valueTypeOnStack = CodeFlow.IsValueType(lastDesc);
// Check if need to box it for the method reference?
if (valueTypeOnStack && paramDesc.IsReferenceType)
{
CodeFlow.InsertBoxIfNecessary(gen, lastDesc);
}
else if (paramDesc.IsValueType && !paramDesc.IsBoxed && !valueTypeOnStack)
{
gen.Emit(OpCodes.Unbox_Any, paramDesc.Value);
}
else
{
// This would be unnecessary in the case of subtyping (e.g. method takes Number but Integer passed in)
CodeFlow.InsertCastClass(gen, paramDesc);
}
cf.ExitCompilationScope();
}
private void Walk(ILGenerator gen, CodeFlow cf, SpelNode operand)
{
if (operand is OpPlus plus)
{
Walk(gen, cf, plus.LeftOperand);
Walk(gen, cf, plus.RightOperand);
}
else if (operand != null)
{
cf.EnterCompilationScope();
operand.GenerateCode(gen, cf);
if (cf.LastDescriptor() != TypeDescriptor.STRING)
{
gen.Emit(OpCodes.Castclass, typeof(string));
}
cf.ExitCompilationScope();
gen.Emit(OpCodes.Callvirt, _appendString);
}
}