/// <summary>
/// Set this iterator to be the same as the specified iterator.
/// </summary>
public void SetIterator(IteratorDescriptor iterInfo)
{
if (iterInfo.HasLabelNext)
{
this.lblNext = iterInfo.GetLabelNext();
this.hasNext = true;
}
this.storage = iterInfo.Storage;
}
/// <summary>
/// Set this iterator to be the same as the specified iterator.
/// </summary>
public void SetIterator(IteratorDescriptor iterInfo)
{
if (iterInfo.HasLabelNext)
{
_lblNext = iterInfo.GetLabelNext();
_hasNext = true;
}
_storage = iterInfo.Storage;
}
/// <summary>
/// Set this iterator to be the same as the specified iterator.
/// </summary>
public void SetIterator(IteratorDescriptor iterInfo) {
if (iterInfo.HasLabelNext) {
this.lblNext = iterInfo.GetLabelNext();
this.hasNext = true;
}
this.storage = iterInfo.Storage;
}
/// <summary>
/// Internal helper initializor.
/// </summary>
private void Init(IteratorDescriptor iterParent, GenerateHelper helper) {
this.helper = helper;
this.iterParent = iterParent;
}
/// <summary>
/// Create an IteratorDescriptor that is nested in a parent iterator.
/// </summary>
public IteratorDescriptor(IteratorDescriptor iterParent) {
Init(iterParent, iterParent.helper);
}
/// <summary>
/// Internal helper initializor.
/// </summary>
private void Init(IteratorDescriptor iterParent, GenerateHelper helper)
{
_helper = helper;
_iterParent = iterParent;
}
/// <summary>
/// Create an IteratorDescriptor that is nested in a parent iterator.
/// </summary>
public IteratorDescriptor(IteratorDescriptor iterParent)
{
Init(iterParent, iterParent._helper);
}
/// <summary>
/// Create IteratorDescriptor for each global value. This pre-visit is necessary because a global early
/// in the list may reference a global later in the list and therefore expect its IteratorDescriptor to already
/// be initialized.
/// </summary>
private void PrepareGlobalValues(QilList globalIterators)
{
MethodInfo methGlobal;
IteratorDescriptor iterInfo;
foreach (QilIterator iter in globalIterators)
{
Debug.Assert(iter.NodeType == QilNodeType.Let || iter.NodeType == QilNodeType.Parameter);
// Get metadata for method which computes this global's value
methGlobal = XmlILAnnotation.Write(iter).FunctionBinding;
Debug.Assert(methGlobal != null, "Metadata for global value should have already been computed");
// Create an IteratorDescriptor for this global value
iterInfo = new IteratorDescriptor(_helper);
// Iterator items will be stored in a global location
iterInfo.Storage = StorageDescriptor.Global(methGlobal, GetItemStorageType(iter), !iter.XmlType.IsSingleton);
// Associate IteratorDescriptor with parameter
XmlILAnnotation.Write(iter).CachedIteratorDescriptor = iterInfo;
}
}
/// <summary>
/// End construction of the current iterator.
/// </summary>
private void EndNestedIterator(QilNode nd)
{
Debug.Assert(_iterCurr.Storage.Location == ItemLocation.None ||
_iterCurr.Storage.ItemStorageType == GetItemStorageType(nd) ||
_iterCurr.Storage.ItemStorageType == typeof(XPathItem) ||
nd.XmlType.TypeCode == XmlTypeCode.None,
"QilNodeType " + nd.NodeType + " cannot be stored using type " + _iterCurr.Storage.ItemStorageType + ".");
// If the nested iterator was constructed in branching mode,
if (_iterCurr.IsBranching)
{
// Then if branching hasn't already taken place, do so now
if (_iterCurr.Storage.Location != ItemLocation.None)
{
_iterCurr.EnsureItemStorageType(nd.XmlType, typeof(bool));
_iterCurr.EnsureStackNoCache();
if (_iterCurr.CurrentBranchingContext == BranchingContext.OnTrue)
_helper.Emit(OpCodes.Brtrue, _iterCurr.LabelBranch);
else
_helper.Emit(OpCodes.Brfalse, _iterCurr.LabelBranch);
_iterCurr.Storage = StorageDescriptor.None();
}
}
// Save current iterator as nested iterator
_iterNested = _iterCurr;
// Update current iterator to be parent iterator
_iterCurr = _iterCurr.ParentIterator;
}
/// <summary>
/// Start construction of a new nested iterator. If this.iterCurr == null, then the new iterator
/// is a top-level, or root iterator. Otherwise, the new iterator will be nested within the
/// current iterator.
/// </summary>
private void StartNestedIterator(QilNode nd)
{
IteratorDescriptor iterParent = _iterCurr;
// Create a new, nested iterator
if (iterParent == null)
{
// Create a "root" iterator info that has no parernt
_iterCurr = new IteratorDescriptor(_helper);
}
else
{
// Create a nested iterator
_iterCurr = new IteratorDescriptor(iterParent);
}
_iterNested = null;
}
/// <summary>
/// Generate code for the specified function.
/// </summary>
private void Function(QilFunction ndFunc)
{
MethodInfo methFunc;
int paramId;
IteratorDescriptor iterInfo;
bool useWriter;
// Annotate each function parameter with a IteratorDescriptor
foreach (QilIterator iter in ndFunc.Arguments)
{
Debug.Assert(iter.NodeType == QilNodeType.Parameter);
// Create an IteratorDescriptor for this parameter
iterInfo = new IteratorDescriptor(_helper);
// Add one to parameter index, as 0th parameter is always "this"
paramId = XmlILAnnotation.Write(iter).ArgumentPosition + 1;
// The ParameterInfo for each argument should be set as its location
iterInfo.Storage = StorageDescriptor.Parameter(paramId, GetItemStorageType(iter), !iter.XmlType.IsSingleton);
// Associate IteratorDescriptor with Let iterator
XmlILAnnotation.Write(iter).CachedIteratorDescriptor = iterInfo;
}
methFunc = XmlILAnnotation.Write(ndFunc).FunctionBinding;
useWriter = (XmlILConstructInfo.Read(ndFunc).ConstructMethod == XmlILConstructMethod.Writer);
// Generate query code from QilExpression tree
_helper.MethodBegin(methFunc, ndFunc.SourceLine, useWriter);
foreach (QilIterator iter in ndFunc.Arguments)
{
// DebugInfo: Sequence point just before generating code for the bound expression
if (_qil.IsDebug && iter.SourceLine != null)
_helper.DebugSequencePoint(iter.SourceLine);
// Calculate default value of this parameter
if (iter.Binding != null)
{
Debug.Assert(iter.XmlType == TypeFactory.ItemS, "IlGen currently only supports default values in parameters of type item*.");
paramId = (iter.Annotation as XmlILAnnotation).ArgumentPosition + 1;
// runtime.MatchesXmlType(param, XmlTypeCode.QName);
Label lblLocalComputed = _helper.DefineLabel();
_helper.LoadQueryRuntime();
_helper.LoadParameter(paramId);
_helper.LoadInteger((int)XmlTypeCode.QName);
_helper.Call(XmlILMethods.SeqMatchesCode);
_helper.Emit(OpCodes.Brfalse, lblLocalComputed);
// Compute default value of this parameter
StartNestedIterator(iter);
NestedVisitEnsureStack(iter.Binding, GetItemStorageType(iter), /*isCached:*/!iter.XmlType.IsSingleton);
EndNestedIterator(iter);
_helper.SetParameter(paramId);
_helper.MarkLabel(lblLocalComputed);
}
}
StartNestedIterator(ndFunc);
// If function did not push results to writer, then function will return value(s) (rather than void)
if (useWriter)
NestedVisit(ndFunc.Definition);
else
NestedVisitEnsureStack(ndFunc.Definition, GetItemStorageType(ndFunc), !ndFunc.XmlType.IsSingleton);
EndNestedIterator(ndFunc);
_helper.MethodEnd();
}
/// <summary>
/// Set this iterator to be the same as the specified iterator.
/// </summary>
public void SetIterator(IteratorDescriptor iterInfo)
{
if (iterInfo.HasLabelNext)
{
_lblNext = iterInfo.GetLabelNext();
_hasNext = true;
}
_storage = iterInfo.Storage;
}
/// <summary>
/// Internal helper initializor.
/// </summary>
private void Init(IteratorDescriptor iterParent, GenerateHelper helper)
{
_helper = helper;
_iterParent = iterParent;
}
/// <summary>
/// Internal helper initializor.
/// </summary>
private void Init(IteratorDescriptor iterParent, GenerateHelper helper)
{
this.helper = helper;
this.iterParent = iterParent;
}