public static ExpressionAction ResolveMetadataDeclarationFor(MethodCallExpression expression, IRequirementsBuilder requirementsBuiler, out Expression replacement)
{
replacement = null;
if (!IsMetadataDeclarationForMethod(expression.Method))
return ExpressionAction.None;
if (expression.Arguments.Count == 0 || typeof(Expression).IsAssignableFrom(expression.Arguments[0].Type))
return ExpressionAction.None;
// if any parameters are referenced, fail the expression (cannot port, cannot invoke)
if (RegionAnalysisStrategy.GetReferencedParameters(expression.Object).Count() > 0)
return ExpressionAction.Fail;
// if object is a constant, set a metadata requirement and continue
if (expression.Object == null)
throw new ArgumentNullException();
if (expression.Object is ConstantExpression)
{
var constexp = (ConstantExpression) expression.Object;
requirementsBuiler.NoteMetadataRequirement(new MetadataInfo(expression.Arguments[0].Type, (IExodataDeclaration)constexp.Value, expression.Method,
(expression.Arguments.Count == 2) ? expression.Arguments[1] : null));
return ExpressionAction.Retain;
}
// otherwise, attempt to convert the constant expression to a constant
var constval = (IExodataDeclaration)Expression.Lambda(expression.Object).Compile().DynamicInvoke();
var objectValue = Expression.Constant(constval);
replacement = Expression.Call(objectValue, expression.Method, expression.Arguments);
return ExpressionAction.Replace;
}