public static void CheckValueTypeClone(ResolveResult resolveResult, Expression expression, IAbstractEmitterBlock block, int insertPosition)
{
if (resolveResult == null || resolveResult.IsError)
{
return;
}
if (block.Emitter.IsAssignment)
{
return;
}
var conversion = block.Emitter.Resolver.Resolver.GetConversion(expression);
if (conversion.IsBoxingConversion || conversion.IsUnboxingConversion)
{
return;
}
if (resolveResult is InvocationResolveResult)
{
bool ret = true;
if (expression.Parent is InvocationExpression)
{
var invocationExpression = (InvocationExpression)expression.Parent;
if (invocationExpression.Arguments.Any(a => a == expression))
{
ret = false;
}
}
else if (expression.Parent is AssignmentExpression)
{
ret = false;
}
else if (expression.Parent is VariableInitializer)
{
ret = false;
}
if (ret)
{
return;
}
}
var rrtype = resolveResult.Type;
var forEachResolveResult = resolveResult as ForEachResolveResult;
if (forEachResolveResult != null)
{
rrtype = forEachResolveResult.ElementType;
}
var nullable = rrtype.IsKnownType(KnownTypeCode.NullableOfT);
var type = nullable ? ((ParameterizedType)rrtype).TypeArguments[0] : rrtype;
if (type.Kind == TypeKind.Struct)
{
if (Helpers.IsImmutableStruct(block.Emitter, type))
{
return;
}
var memberResult = resolveResult as MemberResolveResult;
var field = memberResult != null ? memberResult.Member as DefaultResolvedField : null;
if (field != null && field.IsReadOnly)
{
if (nullable)
{
block.Emitter.Output.Insert(insertPosition, JS.Types.SYSTEM_NULLABLE + "." + JS.Funcs.Math.LIFT1 + "(\"" + JS.Funcs.CLONE + "\", ");
block.WriteCloseParentheses();
}
else
{
block.Write("." + JS.Funcs.CLONE + "()");
}
return;
}
var isOperator = false;
if (expression != null &&
(expression.Parent is BinaryOperatorExpression || expression.Parent is UnaryOperatorExpression))
{
var orr = block.Emitter.Resolver.ResolveNode(expression.Parent, block.Emitter) as OperatorResolveResult;
isOperator = orr != null && orr.UserDefinedOperatorMethod != null;
}
if (expression == null || isOperator ||
expression.Parent is NamedExpression ||
expression.Parent is ObjectCreateExpression ||
expression.Parent is ArrayInitializerExpression ||
expression.Parent is ReturnStatement ||
expression.Parent is InvocationExpression ||
expression.Parent is AssignmentExpression ||
expression.Parent is VariableInitializer ||
expression.Parent is ForeachStatement && resolveResult is ForEachResolveResult)
{
if (expression != null && expression.Parent is InvocationExpression)
{
var invocationExpression = (InvocationExpression)expression.Parent;
if (invocationExpression.Target == expression)
{
return;
}
}
if (nullable)
{
block.Emitter.Output.Insert(insertPosition, JS.Types.SYSTEM_NULLABLE + "." + JS.Funcs.Math.LIFT1 + "(\"" + JS.Funcs.CLONE + "\", ");
block.WriteCloseParentheses();
}
else
{
block.Write("." + JS.Funcs.CLONE + "()");
}
}
}
}
