public override AstNode Visit(AssignmentExpression node)
{
// Begin the node.
builder.BeginNode(node);
// Get the variable and his value.
Expression variable = node.GetVariable();
Expression value = node.GetValue();
// Get the types.
//IChelaType variableType = variable.GetNodeType();
IChelaType valueType = value.GetNodeType();
IChelaType coercionType = node.GetCoercionType();
// Get the variable data.
Variable variableData = (Variable)variable.GetNodeValue();
// Visit the variable.
variable.Accept(this);
// Duplicate the reference.
DuplicateReference(node, variableData);
// Visit the value.
value.Accept(this);
// Check for delayed coercion
if(node.DelayedCoercion)
{
ConstantValue constant = (ConstantValue) value.GetNodeValue();
uint size = coercionType.GetSize();
if(coercionType.IsUnsigned())
{
// Check unsigned ranges.
ulong cval = constant.GetULongValue();
if(size <= 1 && cval > 0xFFu ||
size <= 2 && cval > 0xFFFFu ||
size <= 4 && cval > 0xFFFFFFFFu)
Error(node, "cannot implicitly convert {0} into a {1}.", cval, coercionType.GetName());
}
else
{
// Check for unsigned constraint.
long cval = constant.GetLongValue();
if(cval < 0)
{
if(coercionType.IsUnsigned())
Error(node, "cannot convert signed {0} into {1}.", cval, coercionType.GetName());
cval = -cval;
}
// Check signed ranges.
if(size <= 1 && cval > 0x7Fu ||
size <= 2 && cval > 0x7FFFu ||
size <= 4 && cval > 0x7FFFFFFFu)
Error(node, "cannot implicitly convert {0} into a {1}.", cval, coercionType.GetName());
}
}
// Cast the value.
if(valueType != coercionType)
Cast(node, value.GetNodeValue(), valueType, coercionType);
// Store the value into the variable.
PerformAssignment(node, variableData);
// Set the node value.
node.SetNodeValue(variableData);
return builder.EndNode();
}
