//-----------------------------------------------
// choice
//-----------------------------------------------
public QilTernary Conditional(QilNode left, QilNode center, QilNode right)
{
QilTernary n = new QilTernary(QilNodeType.Conditional, left, center, right);
n.XmlType = this.typeCheck.CheckConditional(n);
TraceNode(n);
return(n);
}
protected virtual QilNode VisitConditional(QilTernary n)
{
return(VisitChildren(n));
}
//-----------------------------------------------
// choice
//-----------------------------------------------
public XmlQueryType CheckConditional(QilTernary node)
{
CheckXmlType(node.Left, XmlQueryTypeFactory.BooleanX);
return(XmlQueryTypeFactory.Choice(node.Center.XmlType, node.Right.XmlType));
}
//-----------------------------------------------
// choice
//-----------------------------------------------
public XmlQueryType CheckConditional(QilTernary node) {
CheckXmlType(node.Left, XmlQueryTypeFactory.BooleanX);
return XmlQueryTypeFactory.Choice(node.Center.XmlType, node.Right.XmlType);
}
protected virtual QilNode VisitConditional(QilTernary n) { return VisitChildren(n); }
protected override QilNode VisitConditional(QilTernary n)
{
return(NoReplace(n));
}
protected override QilNode VisitConditional(QilTernary n) { return NoReplace(n); }
protected override QilNode VisitConditional(QilTernary local0) {
QilNode local1 = local0[0];
QilNode local2 = local0[1];
QilNode local3 = local0[2];
if (this[XmlILOptimization.FoldNone]) {
if ( (object) ( (local1).XmlType ) == (object) XmlQueryTypeFactory.None ) {
if (AllowReplace(XmlILOptimization.FoldNone, local0)) {
return Replace(XmlILOptimization.FoldNone, local0, VisitNop(f.Nop(local1)));
}
}
}
if (this[XmlILOptimization.EliminateConditional]) {
if (local1.NodeType == QilNodeType.True) {
if (AllowReplace(XmlILOptimization.EliminateConditional, local0)) {
return Replace(XmlILOptimization.EliminateConditional, local0, local2);
}
}
}
if (this[XmlILOptimization.EliminateConditional]) {
if (local1.NodeType == QilNodeType.False) {
if (AllowReplace(XmlILOptimization.EliminateConditional, local0)) {
return Replace(XmlILOptimization.EliminateConditional, local0, local3);
}
}
}
if (this[XmlILOptimization.EliminateConditional]) {
if (local2.NodeType == QilNodeType.True) {
if (local3.NodeType == QilNodeType.False) {
if (AllowReplace(XmlILOptimization.EliminateConditional, local0)) {
return Replace(XmlILOptimization.EliminateConditional, local0, local1);
}
}
}
}
if (this[XmlILOptimization.EliminateConditional]) {
if (local2.NodeType == QilNodeType.False) {
if (local3.NodeType == QilNodeType.True) {
if (AllowReplace(XmlILOptimization.EliminateConditional, local0)) {
return Replace(XmlILOptimization.EliminateConditional, local0, VisitNot(f.Not(local1)));
}
}
}
}
if (this[XmlILOptimization.FoldConditionalNot]) {
if (local1.NodeType == QilNodeType.Not) {
QilNode local4 = local1[0];
if (AllowReplace(XmlILOptimization.FoldConditionalNot, local0)) {
return Replace(XmlILOptimization.FoldConditionalNot, local0, VisitConditional(f.Conditional(local4, local3, local2)));
}
}
}
if (this[XmlILOptimization.NormalizeConditionalText]) {
if (local2.NodeType == QilNodeType.TextCtor) {
QilNode local4 = local2[0];
if (local3.NodeType == QilNodeType.TextCtor) {
QilNode local5 = local3[0];
if (AllowReplace(XmlILOptimization.NormalizeConditionalText, local0)) {
return Replace(XmlILOptimization.NormalizeConditionalText, local0, VisitTextCtor(f.TextCtor(VisitConditional(f.Conditional(local1, local4, local5)))));
}
}
}
}
return NoReplace(local0);
}
//-----------------------------------------------
// choice
//-----------------------------------------------
public QilTernary Conditional(QilNode left, QilNode center, QilNode right) {
QilTernary n = new QilTernary(QilNodeType.Conditional, left, center, right);
n.XmlType = this.typeCheck.CheckConditional(n);
TraceNode(n);
return n;
}
/// <summary>
/// Analyze conditional.
/// </summary>
protected virtual void AnalyzeConditional(QilTernary ndCond, XmlILConstructInfo info) {
PossibleXmlStates xstatesTrue;
// Ensure that construct method is Writer
info.ConstructMethod = XmlILConstructMethod.Writer;
// Visit true branch; save resulting states
ndCond.Center = AnalyzeContent(ndCond.Center);
xstatesTrue = this.xstates;
// Restore starting states and visit false branch
this.xstates = info.InitialStates;
ndCond.Right = AnalyzeContent(ndCond.Right);
// Conditional ending states consist of combination of true and false branch states
if (xstatesTrue != this.xstates)
this.xstates = PossibleXmlStates.Any;
}
/// <summary>
/// Generate code for QilNodeType.Conditional.
/// </summary>
protected override QilNode VisitConditional(QilTernary ndCond)
{
XmlILConstructInfo info = XmlILConstructInfo.Read(ndCond);
if (info.ConstructMethod == XmlILConstructMethod.Writer)
{
Label lblFalse, lblDone;
// Evaluate if test
lblFalse = _helper.DefineLabel();
NestedVisitWithBranch(ndCond.Left, BranchingContext.OnFalse, lblFalse);
// Generate true branch code
NestedVisit(ndCond.Center);
// Generate false branch code. If false branch is the empty list,
if (ndCond.Right.NodeType == QilNodeType.Sequence && ndCond.Right.Count == 0)
{
// Then generate simplified code that doesn't contain a false branch
_helper.MarkLabel(lblFalse);
NestedVisit(ndCond.Right);
}
else
{
// Jump past false branch
lblDone = _helper.DefineLabel();
_helper.EmitUnconditionalBranch(OpCodes.Br, lblDone);
// Generate false branch code
_helper.MarkLabel(lblFalse);
NestedVisit(ndCond.Right);
_helper.MarkLabel(lblDone);
}
_iterCurr.Storage = StorageDescriptor.None();
}
else
{
IteratorDescriptor iterInfoTrue;
LocalBuilder locBool = null, locCond = null;
Label lblFalse, lblDone, lblNext;
Type itemStorageType = GetItemStorageType(ndCond);
Debug.Assert(info.ConstructMethod == XmlILConstructMethod.Iterator);
// Evaluate conditional test -- save boolean result in boolResult
Debug.Assert(ndCond.Left.XmlType.TypeCode == XmlTypeCode.Boolean);
lblFalse = _helper.DefineLabel();
if (ndCond.XmlType.IsSingleton)
{
// if (!bool-expr) goto LabelFalse;
NestedVisitWithBranch(ndCond.Left, BranchingContext.OnFalse, lblFalse);
}
else
{
// CondType itemCond;
// int boolResult = bool-expr;
locCond = _helper.DeclareLocal("$$$cond", itemStorageType);
locBool = _helper.DeclareLocal("$$$boolResult", typeof(bool));
NestedVisitEnsureLocal(ndCond.Left, locBool);
// if (!boolResult) goto LabelFalse;
_helper.Emit(OpCodes.Ldloc, locBool);
_helper.Emit(OpCodes.Brfalse, lblFalse);
}
// Generate code for true branch
ConditionalBranch(ndCond.Center, itemStorageType, locCond);
iterInfoTrue = _iterNested;
// goto LabelDone;
lblDone = _helper.DefineLabel();
_helper.EmitUnconditionalBranch(OpCodes.Br, lblDone);
// Generate code for false branch
// LabelFalse:
_helper.MarkLabel(lblFalse);
ConditionalBranch(ndCond.Right, itemStorageType, locCond);
// If conditional is not cardinality one, then need to iterate through all values
if (!ndCond.XmlType.IsSingleton)
{
Debug.Assert(!ndCond.Center.XmlType.IsSingleton || !ndCond.Right.XmlType.IsSingleton);
// IL's rules do not allow OpCodes.Br here
// goto LabelDone;
_helper.EmitUnconditionalBranch(OpCodes.Brtrue, lblDone);
// LabelNext:
lblNext = _helper.DefineLabel();
_helper.MarkLabel(lblNext);
// if (boolResult) goto LabelNextTrue else goto LabelNextFalse;
_helper.Emit(OpCodes.Ldloc, locBool);
_helper.Emit(OpCodes.Brtrue, iterInfoTrue.GetLabelNext());
_helper.EmitUnconditionalBranch(OpCodes.Br, _iterNested.GetLabelNext());
_iterCurr.SetIterator(lblNext, StorageDescriptor.Local(locCond, itemStorageType, false));
}
// LabelDone:
_helper.MarkLabel(lblDone);
}
return ndCond;
}
protected override QilNode VisitConditional(QilTernary local0)
{
QilNode local1 = local0[0];
QilNode local2 = local0[1];
QilNode local3 = local0[2];
if (this[XmlILOptimization.FoldNone])
{
if ((object)((local1).XmlType) == (object)XmlQueryTypeFactory.None)
{
// PATTERN: [FoldNone] (Conditional $x:* ^ (None? (TypeOf $x)) * *) => (Nop $x)
if (AllowReplace(XmlILOptimization.FoldNone, local0))
{
return Replace(XmlILOptimization.FoldNone, local0, VisitNop(f.Nop(local1)));
}
}
}
if (this[XmlILOptimization.EliminateConditional])
{
if (local1.NodeType == QilNodeType.True)
{
// PATTERN: [EliminateConditional] (Conditional (True) $x:* *) => $x
if (AllowReplace(XmlILOptimization.EliminateConditional, local0))
{
return Replace(XmlILOptimization.EliminateConditional, local0, local2);
}
}
}
if (this[XmlILOptimization.EliminateConditional])
{
if (local1.NodeType == QilNodeType.False)
{
// PATTERN: [EliminateConditional] (Conditional (False) * $x:*) => $x
if (AllowReplace(XmlILOptimization.EliminateConditional, local0))
{
return Replace(XmlILOptimization.EliminateConditional, local0, local3);
}
}
}
if (this[XmlILOptimization.EliminateConditional])
{
if (local2.NodeType == QilNodeType.True)
{
if (local3.NodeType == QilNodeType.False)
{
// PATTERN: [EliminateConditional] (Conditional $x:* (True) (False)) => $x
if (AllowReplace(XmlILOptimization.EliminateConditional, local0))
{
return Replace(XmlILOptimization.EliminateConditional, local0, local1);
}
}
}
}
if (this[XmlILOptimization.EliminateConditional])
{
if (local2.NodeType == QilNodeType.False)
{
if (local3.NodeType == QilNodeType.True)
{
// PATTERN: [EliminateConditional] (Conditional $x:* (False) (True)) => (Not $x)
if (AllowReplace(XmlILOptimization.EliminateConditional, local0))
{
return Replace(XmlILOptimization.EliminateConditional, local0, VisitNot(f.Not(local1)));
}
}
}
}
if (this[XmlILOptimization.FoldConditionalNot])
{
if (local1.NodeType == QilNodeType.Not)
{
QilNode local4 = local1[0];
// PATTERN: [FoldConditionalNot] (Conditional (Not $x:*) $t:* $f:*) => (Conditional $x $f $t)
if (AllowReplace(XmlILOptimization.FoldConditionalNot, local0))
{
return Replace(XmlILOptimization.FoldConditionalNot, local0, VisitConditional(f.Conditional(local4, local3, local2)));
}
}
}
if (this[XmlILOptimization.NormalizeConditionalText])
{
if (local2.NodeType == QilNodeType.TextCtor)
{
QilNode local4 = local2[0];
if (local3.NodeType == QilNodeType.TextCtor)
{
QilNode local5 = local3[0];
// PATTERN: [NormalizeConditionalText] (Conditional $cond:* $left:(TextCtor $leftText:*) $right:(TextCtor $rightText:*)) => (TextCtor (Conditional $cond $leftText $rightText))
if (AllowReplace(XmlILOptimization.NormalizeConditionalText, local0))
{
return Replace(XmlILOptimization.NormalizeConditionalText, local0, VisitTextCtor(f.TextCtor(VisitConditional(f.Conditional(local1, local4, local5)))));
}
}
}
}
return NoReplace(local0);
}
