internal static Loop Loop(LoopExpression expression)
{
return new Loop()
{
Body = Serialize(expression.Body),
BreakLabel = expression.BreakLabel.Null(l => LabelTarget.Serialize(l)),
ContinueLabel = expression.ContinueLabel.Null(l => LabelTarget.Serialize(l)),
}.Apply(n => n.Type = TypeRef.Serialize(expression.Type));
}
protected override Expression VisitLoop(LoopExpression node)
{
if (node.BreakLabel != null)
{
Labels.Add(node.BreakLabel);
}
if (node.ContinueLabel != null)
{
Labels.Add(node.ContinueLabel);
}
return base.VisitLoop(node);
}
protected override Expression VisitLoop(LoopExpression node)
{
PushLabelInfo(node);
var body = Visit(node.Body);
var @break = default(LabelTarget);
var @continue = default(LabelTarget);
PopLabelInfo(out @break, out @continue);
return node.Update(@break, @continue, body);
}
protected override Expression VisitLoop(LoopExpression node)
{
throw new NotSupportedException();
}
private void Compile(object frameObj) {
if (Compiled) {
return;
}
lock (this) {
if (Compiled) {
return;
}
PerfTrack.NoteEvent(PerfTrack.Categories.Compiler, "Interpreted loop compiled");
InterpretedFrame frame = (InterpretedFrame)frameObj;
var compiler = new LoopCompiler(_loop, frame.Interpreter.LabelMapping, _variables, _closureVariables, _instructionIndex, _loopEnd);
var instructions = frame.Interpreter.Instructions.Instructions;
// replace this instruction with an optimized one:
Interlocked.Exchange(ref instructions[_instructionIndex], new CompiledLoopInstruction(compiler.CreateDelegate()));
// invalidate this instruction, some threads may still hold on it:
_loop = null;
_variables = null;
_closureVariables = null;
}
}
internal EnterLoopInstruction(LoopExpression loop, LocalVariables locals, int compilationThreshold, int instructionIndex) {
_loop = loop;
_variables = locals.CopyLocals();
_closureVariables = locals.ClosureVariables;
_compilationThreshold = compilationThreshold;
_instructionIndex = instructionIndex;
}
public LoopExpressionProxy(LoopExpression node) {
_node = node;
}
/// <summary>
/// Visits the children of the <see cref="LoopExpression"/>.
/// </summary>
/// <param name="node">The expression to visit.</param>
/// <returns>The modified expression, if it or any subexpression was modified;
/// otherwise, returns the original expression.</returns>
protected internal virtual Expression VisitLoop(LoopExpression node)
{
return(node.Update(VisitLabelTarget(node.BreakLabel), VisitLabelTarget(node.ContinueLabel), Visit(node.Body)));
}
public virtual bool IsEvaluatableLoop (LoopExpression node)
{
ArgumentUtility.CheckNotNull ("node", node);
return true;
}
}//end static method
internal XElement LoopExpressionToXElement(LoopExpression e)
{
object value;
string xName = "LoopExpression";
object[] XElementValues = new object[6];
value = ((LoopExpression)e).Type;
XElementValues[0] = GenerateXmlFromProperty(typeof(System.Type),
"Type", value ?? string.Empty);
value = ((LoopExpression)e).NodeType;
XElementValues[1] = GenerateXmlFromProperty(typeof(System.Linq.Expressions.ExpressionType),
"NodeType", value ?? string.Empty);
value = ((LoopExpression)e).Body;
XElementValues[2] = GenerateXmlFromProperty(typeof(System.Linq.Expressions.Expression),
"Body", value ?? string.Empty);
value = ((LoopExpression)e).BreakLabel;
XElementValues[3] = GenerateXmlFromProperty(typeof(System.Linq.Expressions.LabelTarget),
"BreakLabel", value ?? string.Empty);
value = ((LoopExpression)e).ContinueLabel;
XElementValues[4] = GenerateXmlFromProperty(typeof(System.Linq.Expressions.LabelTarget),
"ContinueLabel", value ?? string.Empty);
value = ((LoopExpression)e).CanReduce;
XElementValues[5] = GenerateXmlFromProperty(typeof(System.Boolean),
"CanReduce", value ?? string.Empty);
return new XElement(xName, XElementValues);
}//end static method
public LoopExpressionProxy(LoopExpression node)
{
ContractUtils.RequiresNotNull(node, nameof(node));
_node = node;
}
public LoopVisitor(LoopExpression node) : base(node)
{
this.node = node;
}
protected internal override Expression VisitLoop(LoopExpression node)
{
Out("loop { ... }");
return(node);
}
private Variable VisitLoop(LoopExpression node)
{
throw new NotSupportedException("Expression of type " + node.NodeType + " is not supported");
//this.Out("loop { ... }");
}
private void PushLabelInfo(LoopExpression loop)
{
_loopLabels.Push(new LoopLabelInfo { Break = loop.BreakLabel, Continue = loop.ContinueLabel });
}
internal EnterLoopInstruction(LoopExpression loop, int compilationThreshold, int instructionIndex) {
_loop = loop;
_compilationThreshold = compilationThreshold;
_instructionIndex = instructionIndex;
}
private static string VisitLoop(LoopExpression node)
{
throw new NotImplementedException();
}
public LoopExpressionProxy(LoopExpression node)
{
ContractUtils.RequiresNotNull(node, nameof(node));
_node = node;
}
