private CompiledExpression CreateExpressionClass(ISpelNode expressionToCompile)
{
var compiledExpression = new SpelCompiledExpression(_loggerFactory);
var methodName = "SpelExpression" + _suffixId.GetAndIncrement();
var method = new DynamicMethod(methodName, typeof(object), new Type[] { typeof(SpelCompiledExpression), typeof(object), typeof(IEvaluationContext) }, typeof(SpelCompiledExpression));
var ilGenerator = method.GetILGenerator(4096);
var cf = new CodeFlow(compiledExpression);
try
{
expressionToCompile.GenerateCode(ilGenerator, cf);
var lastDescriptor = cf.LastDescriptor();
CodeFlow.InsertBoxIfNecessary(ilGenerator, lastDescriptor);
if (lastDescriptor == TypeDescriptor.V)
{
ilGenerator.Emit(OpCodes.Ldnull);
}
ilGenerator.Emit(OpCodes.Ret);
compiledExpression.MethodDelegate = method.CreateDelegate(typeof(SpelExpressionDelegate));
var initMethod = cf.Finish(_suffixId.Value);
if (initMethod != null)
{
compiledExpression.InitDelegate = initMethod.CreateDelegate(typeof(SpelExpressionInitDelegate));
}
return(compiledExpression);
}
catch (Exception ex)
{
_logger?.LogDebug(expressionToCompile.GetType().Name + ".GenerateCode opted out of compilation: " + ex.Message);
return(null);
}
}
