private IStrongBox GetBox(ParameterExpression variable)
{
// Skip variables that are shadowed by a nested scope/lambda
foreach (Set <ParameterExpression> hidden in _shadowedVars)
{
if (hidden.Contains(variable))
{
return(null);
}
}
HoistedLocals scope = _scope;
object[] locals = _locals;
while (true)
{
int hoistIndex;
if (scope.Indexes.TryGetValue(variable, out hoistIndex))
{
return((IStrongBox)locals[hoistIndex]);
}
scope = scope.Parent;
if (scope == null)
{
break;
}
locals = HoistedLocals.GetParent(locals);
}
// Unbound variable: an error should've been thrown already
// from VariableBinder
throw ContractUtils.Unreachable;
}
private IStrongBox GetBox(ParameterExpression variable)
{
// Skip variables that are shadowed by a nested scope/lambda
foreach (Set <ParameterExpression> hidden in _hiddenVars)
{
if (hidden.Contains(variable))
{
return(null);
}
}
HoistedLocals scope = _scope;
object[] locals = _locals;
while (true)
{
int hoistIndex;
if (scope.Indexes.TryGetValue(variable, out hoistIndex))
{
return((IStrongBox)locals[hoistIndex]);
}
scope = scope.Parent;
if (scope == null)
{
break;
}
locals = HoistedLocals.GetParent(locals);
}
// TODO: this should be unreachable because it's an unbound
// variable, so we should throw here. It's a breaking change,
// however
return(null);
}
private IStrongBox GetBox(ParameterExpression variable)
{
int num;
foreach (Set <ParameterExpression> set in this._shadowedVars)
{
if (set.Contains(variable))
{
return(null);
}
}
HoistedLocals parent = this._scope;
object[] objArray = this._locals;
while (!parent.Indexes.TryGetValue(variable, out num))
{
parent = parent.Parent;
if (parent == null)
{
throw ContractUtils.Unreachable;
}
objArray = HoistedLocals.GetParent(objArray);
}
return((IStrongBox)objArray[num]);
}
private IStrongBox GetStrongBox(int index)
{
long num = this._indexes[index];
object[] locals = this._data;
for (int i = (int)(num >> 0x20); i > 0; i--)
{
locals = HoistedLocals.GetParent(locals);
}
return((IStrongBox)locals[(int)num]);
}
private IStrongBox GetStrongBox(int index)
{
// We lookup the closure using two ints:
// 1. The high dword is the number of parents to go up
// 2. The low dword is the index into that array
long closureKey = _indexes[index];
// walk up the parent chain to find the real environment
object[] result = _data;
for (int parents = (int)(closureKey >> 32); parents > 0; parents--)
{
result = HoistedLocals.GetParent(result);
}
// Return the variable storage
return((IStrongBox)result[unchecked ((int)closureKey)]);
}
public IStrongBox this[int index] {
get {
// We lookup the closure using two ints:
// 1. The high dword is the number of parents to go up
// 2. The low dword is the index into that array
long closureKey = _indexes[index];
// walk up the parent chain to find the real environment
object[] result = _data;
for (int parents = (int)(closureKey >> 32); parents > 0; parents--)
{
result = HoistedLocals.GetParent(result);
}
// Return the variable storage
return((IStrongBox)result[(int)closureKey]);
}
set {
throw Error.CollectionReadOnly();
}
}
