internal Delegate _normalDelegate; // the normal delegate - this can be a compiled or interpreted delegate.

private readonly Compiler.Ast.ScopeStatement _lambda; // the original DLR lambda that contains the code

internal readonly string _initialDoc; // the initial doc string

private readonly int _localCount; // the number of local variables in the code

private bool _compilingLight; // true if we're compiling for light exceptions

private int _exceptionCount;

// debugging/tracing support

private LambdaExpression _tracingLambda; // the transformed lambda used for tracing/debugging

internal Delegate _tracingDelegate; // the delegate used for tracing/debugging, if one has been created. This can be interpreted or compiled.

/// <summary>

/// This is both the lock that is held while enumerating the threads or updating the thread accounting

/// information. It's also a marker CodeList which is put in place when we are enumerating the thread

/// list and all additions need to block.

///

/// This lock is also acquired whenever we need to calculate how a function's delegate should be created

/// so that we don't race against sys.settrace/sys.setprofile.

/// </summary>

private static readonly CodeList _CodeCreateAndUpdateDelegateLock = new CodeList();

/// <summary>

/// Constructor used to create a FunctionCode for code that's been serialized to disk.

///

/// Code constructed this way cannot be interpreted or debugged using sys.settrace/sys.setprofile.

///

/// Function codes created this way do support recursion enforcement and are therefore registered in the global function code registry.

/// </summary>

internal FunctionCode(PythonContext context, Delegate code, Compiler.Ast.ScopeStatement scope, string documentation, int localCount) {

_normalDelegate = code;

_lambda = scope;

co_argcount = scope.ArgCount;

co_kwonlyargcount = scope.KwOnlyArgCount;

_initialDoc = documentation;

// need to take this lock to ensure sys.settrace/sys.setprofile is not actively changing

lock (_CodeCreateAndUpdateDelegateLock) {

SetTarget(AddRecursionCheck(context, code));

}

RegisterFunctionCode(context);

}

/// <summary>

/// Constructor to create a FunctionCode at runtime.

///

/// Code constructed this way supports both being interpreted and debugged. When necessary the code will

/// be re-compiled or re-interpreted for that specific purpose.

///

/// Function codes created this way do support recursion enforcement and are therefore registered in the global function code registry.

///

/// the initial delegate provided here should NOT be the actual code. It should always be a delegate which updates our Target lazily.

/// </summary>

internal FunctionCode(PythonContext context, Delegate initialDelegate, Compiler.Ast.ScopeStatement scope, string documentation, bool? tracing, bool register) {

_lambda = scope;

SetTarget(initialDelegate);

_initialDoc = documentation;

_localCount = scope.Variables == null ? 0 : scope.Variables.Count;

co_argcount = scope.ArgCount;

co_kwonlyargcount = scope.KwOnlyArgCount;

if (tracing.HasValue) {

if (tracing.Value) {

_tracingDelegate = initialDelegate;

} else {

_normalDelegate = initialDelegate;

}

}

if (register) {

RegisterFunctionCode(context);

}

}

private static PythonTuple SymbolListToTuple(IList<string> vars) {

if (vars != null && vars.Count != 0) {

object[] tupleData = new object[vars.Count];

for (int i = 0; i < vars.Count; i++) {

tupleData[i] = vars[i];

}

return PythonTuple.MakeTuple(tupleData);

} else {

return PythonTuple.EMPTY;

}

}

private static PythonTuple StringArrayToTuple(string[] closureVars) {

if (closureVars != null && closureVars.Length != 0) {

return PythonTuple.MakeTuple((object[])closureVars);

} else {

return PythonTuple.EMPTY;

}

}

/// <summary>

/// Registers the current function code in our global weak list of all function codes.

///

/// The weak list can be enumerated with GetAllCode().

///

/// Ultimately there are 3 types of threads we care about races with:

/// 1. Other threads which are registering function codes

/// 2. Threads calling sys.settrace which require the world to stop and get updated

/// 3. Threads running cleanup (thread pool thread, or call to gc.collect).

///

/// The 1st two must have perfect synchronization. We cannot have a thread registering

/// a new function which another thread is trying to update all of the functions in the world. Doing

/// so would mean we could miss adding tracing to a thread.

///

/// But the cleanup thread can run in parallel to either registrying or sys.settrace. The only

/// thing it needs to take a lock for is updating our accounting information about the

/// number of code objects are alive.

/// </summary>

private void RegisterFunctionCode(PythonContext context) {

if (_lambda == null) {

return;

}

WeakReference codeRef = new WeakReference(this);

CodeList prevCode;

lock (_CodeCreateAndUpdateDelegateLock) {

Debug.Assert(context._allCodes != _CodeCreateAndUpdateDelegateLock);

// we do an interlocked operation here because this can run in parallel w/ the CodeCleanup thread. The

// lock only prevents us from running in parallel w/ an update to all of the functions in the world which

// needs to be synchronized.

do {

prevCode = context._allCodes;

} while (Interlocked.CompareExchange(ref context._allCodes, new CodeList(codeRef, prevCode), prevCode) != prevCode);

if (context._codeCount++ == context._nextCodeCleanup) {

// run cleanup of codes on another thread

CleanFunctionCodes(context, false);

}

}

}

internal static void CleanFunctionCodes(PythonContext context, bool synchronous) {

if (synchronous) {

CodeCleanup(context);

} else {

ThreadPool.QueueUserWorkItem(CodeCleanup, context);

}

}

internal void SetTarget(Delegate target) {

Target = LightThrowTarget = target;

}

internal void LightThrowCompile(CodeContext/*!*/ context) {

if (++_exceptionCount > 20) {

if (!_compilingLight && (object)Target == (object)LightThrowTarget) {

_compilingLight = true;

if (!IsOnDiskCode) {

ThreadPool.QueueUserWorkItem(x => {

// on mono if the runtime is shutting down, this can throw an InvalidOperationException

try {

var pyCtx = context.LanguageContext;

bool enableTracing;

lock (pyCtx._codeUpdateLock) {

enableTracing = context.LanguageContext.EnableTracing;

}

Delegate target = enableTracing

? ((LambdaExpression)LightExceptions.Rewrite(

GetGeneratorOrNormalLambdaTracing(pyCtx).Reduce())).Compile()

: ((LambdaExpression)LightExceptions.Rewrite(GetGeneratorOrNormalLambda().Reduce()))

.Compile();

lock (pyCtx._codeUpdateLock) {

if (context.LanguageContext.EnableTracing == enableTracing) {

LightThrowTarget = target;

}

}

} catch (InvalidOperationException ex) {

// The InvalidOperationException is thrown with an empty message

if (!string.IsNullOrEmpty(ex.Message)) {

throw;

}

}

});

}

}

}

}

private bool IsOnDiskCode {

get {

if (_lambda is Compiler.Ast.SerializedScopeStatement) {

return true;

}

if (_lambda is Compiler.Ast.PythonAst) {

return ((Compiler.Ast.PythonAst)_lambda).OnDiskProxy;

}

return false;

}

}

/// <summary>

/// Enumerates all function codes for updating the current type of targets we generate.

///

/// While enumerating we hold a lock so that users cannot change sys.settrace/sys.setprofile

/// until the lock is released.

/// </summary>

private static IEnumerable<FunctionCode> GetAllCode(PythonContext context) {

// only a single thread can enumerate the current FunctionCodes at a time.

lock (_CodeCreateAndUpdateDelegateLock) {

CodeList curCodeList = Interlocked.Exchange(ref context._allCodes, _CodeCreateAndUpdateDelegateLock);

Debug.Assert(curCodeList != _CodeCreateAndUpdateDelegateLock);

CodeList initialCode = curCodeList;

try {

while (curCodeList != null) {

WeakReference codeRef = curCodeList.Code;

FunctionCode target = (FunctionCode)codeRef.Target;

if (target != null) {

yield return target;

}

curCodeList = curCodeList.Next;

}

} finally {

Interlocked.Exchange(ref context._allCodes, initialCode);

}

}

}

internal static void UpdateAllCode(PythonContext context) {

foreach (FunctionCode fc in GetAllCode(context)) {

fc.UpdateDelegate(context, false);

}

}

private static void CodeCleanup(object state) {

PythonContext context = (PythonContext)state;

// only allow 1 thread at a time to do cleanup (other threads can continue adding)

lock (context._codeCleanupLock) {

// the bulk of the work is in scanning the list, this proceeeds lock free

int removed = 0, kept = 0;

CodeList prev = null;

CodeList cur = GetRootCodeNoUpdating(context);

while (cur != null) {

if (!cur.Code.IsAlive) {

if (prev == null) {

if (Interlocked.CompareExchange(ref context._allCodes, cur.Next, cur) != cur) {

// someone else snuck in and added a new code entry, spin and try again.

cur = GetRootCodeNoUpdating(context);

continue;

}

cur = cur.Next;

removed++;

continue;

} else {

// remove from the linked list, we're the only one who can change this.

Debug.Assert(prev.Next == cur);

removed++;

cur = prev.Next = cur.Next;

continue;

}

} else {

kept++;

}

prev = cur;

cur = cur.Next;

}

// finally update our bookkeeping statistics which requires locking but is fast.

lock (_CodeCreateAndUpdateDelegateLock) {

// calculate the next cleanup, we want each pass to remove ~50% of all entries

const double removalGoal = .50;

if (context._codeCount == 0) {

// somehow we would have had to queue a bunch of function codes, have 1 thread

// clean them up all up, and a 2nd queued thread waiting to clean them up as well.

// At the same time there would have to be no live functions defined which means

// we're executing top-level code which is causing this to happen.

context._nextCodeCleanup = 200;

return;

}

//Console.WriteLine("Removed {0} entries, {1} remain", removed, context._codeCount);

Debug.Assert(removed <= context._codeCount);

double pctRemoved = (double)removed / (double)context._codeCount; // % of code removed

double targetRatio = pctRemoved / removalGoal; // how we need to adjust our last goal

// update the total and next node cleanup

int newCount = Interlocked.Add(ref context._codeCount, -removed);

Debug.Assert(newCount >= 0);

// set the new target for cleanup

int nextCleanup = targetRatio != 0 ? newCount + (int)(context._nextCodeCleanup / targetRatio) : -1;

if (nextCleanup > 0) {

// we're making good progress, use the newly calculated next cleanup point

context._nextCodeCleanup = nextCleanup;

} else {

// none or very small amount cleaned up, just schedule a cleanup for sometime in the future.

context._nextCodeCleanup += 500;

}

Debug.Assert(context._nextCodeCleanup >= context._codeCount, String.Format("{0} vs {1} ({2})", context._nextCodeCleanup, context._codeCount, targetRatio));

}

}

}

private static CodeList GetRootCodeNoUpdating(PythonContext context) {

CodeList cur = context._allCodes;

if (cur == _CodeCreateAndUpdateDelegateLock) {

lock (_CodeCreateAndUpdateDelegateLock) {

// wait until enumerating thread is done, but it's alright

// if we got cur and then an enumeration started (because we'll

// just clear entries out)

cur = context._allCodes;

Debug.Assert(cur != _CodeCreateAndUpdateDelegateLock);

}

}

return cur;

}

public SourceSpan Span {

[PythonHidden]

get {

return _lambda.Span;

}

}

internal string[] ArgNames {

get {

return _lambda.ParameterNames;

}

}

internal FunctionAttributes Flags {

get {

return _lambda.Flags;

}

}

internal bool IsModule {

get {

return _lambda is Compiler.Ast.PythonAst;

}

}

#region Public constructors

/*

#endregion

#region Public Python API Surface

public PythonTuple co_varnames {

get {

return SymbolListToTuple(_lambda.GetVarNames());

}

}

public int co_argcount { get; }

public int co_kwonlyargcount { get; }

/// <summary>

/// Returns a list of variable names which are accessed from nested functions.

/// </summary>

public PythonTuple co_cellvars {

get {

return SymbolListToTuple(_lambda.CellVariables != null ? ArrayUtils.ToArray(_lambda.CellVariables) : null);

}

}

/// <summary>

/// Returns the byte code. IronPython does not implement this and always

/// returns an empty string for byte code.

/// </summary>

[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1822:MarkMembersAsStatic")]

public object co_code {

get {

return String.Empty;

}

}

/// <summary>

/// Returns a list of constants used by the function.

///

/// The first constant is the doc string, or None if no doc string is provided.

///

/// IronPython currently does not include any other constants than the doc string.

/// </summary>

public PythonTuple co_consts {

get {

if (_initialDoc != null) {

return PythonTuple.MakeTuple(_initialDoc, null);

}

return PythonTuple.MakeTuple((object)null);

}

}

/// <summary>

/// Returns the filename that the code object was defined in.

/// </summary>

public string co_filename {

get {

return _lambda.Filename;

}

}

/// <summary>

/// Returns the 1st line number of the code object.

/// </summary>

public int co_firstlineno {

get {

return Span.Start.Line;

}

}

/// <summary>

/// Returns a set of flags for the function.

///

/// 0x04 is set if the function used *args

/// 0x08 is set if the function used **args

/// 0x20 is set if the function is a generator

/// </summary>

public int co_flags {

get {

return (int)Flags;

}

}

/// <summary>

/// Returns a list of free variables (variables accessed

/// from an outer scope). This does not include variables

/// accessed in the global scope.

/// </summary>

public PythonTuple co_freevars {

get {

return SymbolListToTuple(_lambda.FreeVariables != null ? CollectionUtils.ConvertAll(_lambda.FreeVariables, x => x.Name) : null);

}

}

/// <summary>

/// Returns a mapping between byte code and line numbers. IronPython does

/// not implement this because byte code is not available.

/// </summary>

[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1822:MarkMembersAsStatic")]

public object co_lnotab {

get {

throw PythonOps.NotImplementedError("");

}

}

/// <summary>

/// Returns the name of the code (function name, class name, or &lt;module&gt;).

/// </summary>

public string co_name {

get {

return _lambda.Name;

}

}

/// <summary>

/// Returns a list of global variable names accessed by the code.

/// </summary>

public PythonTuple co_names {

get {

return SymbolListToTuple(_lambda.GlobalVariables);

}

}

/// <summary>

/// Returns the number of local varaibles defined in the function.

/// </summary>

public object co_nlocals {

get {

return _localCount;

}

}

/// <summary>

/// Returns the stack size. IronPython does not implement this

/// because byte code is not supported.

/// </summary>

[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1822:MarkMembersAsStatic")]

public object co_stacksize {

get {

throw PythonOps.NotImplementedError("");

}

}

#endregion

#region ICodeFormattable Members

public string/*!*/ __repr__(CodeContext/*!*/ context) {

return string.Format(

"<code object {0} at {1}, file {2}, line {3}>",

co_name,

PythonOps.HexId(this),

!string.IsNullOrEmpty(co_filename) ? string.Format("\"{0}\"", co_filename) : "???",

co_firstlineno != 0 ? co_firstlineno : -1);

}

#endregion

#region Internal API Surface

internal LightLambdaExpression Code {

get {

return _lambda.GetLambda();

}

}

internal Compiler.Ast.ScopeStatement PythonCode {

get {

return (Compiler.Ast.ScopeStatement)_lambda;

}

}

/// <summary>

/// The current target for the function. This can change based upon adaptive compilation, recursion enforcement, and tracing.

/// </summary>

internal Delegate Target { get; private set; }

internal Delegate LightThrowTarget { get; private set; }

internal object Call(CodeContext/*!*/ context) {

if (co_freevars != PythonTuple.EMPTY) {

throw PythonOps.TypeError("cannot exec code object that contains free variables: {0}", co_freevars.__repr__(context));

}

if (Target == null || (Target.GetMethodInfo()?.DeclaringType == typeof(PythonCallTargets))) {

UpdateDelegate(context.LanguageContext, true);

}

if (Target is Func<CodeContext, CodeContext> classTarget) {

return classTarget(context);

}

if (Target is LookupCompilationDelegate moduleCode) {

return moduleCode(context, this);

}

if (Target is Func<FunctionCode, object> optimizedModuleCode) {

return optimizedModuleCode(this);

}

var func = new PythonFunction(context, this, null, ArrayUtils.EmptyObjects, null, null, new MutableTuple<object>());

CallSite<Func<CallSite, CodeContext, PythonFunction, object>> site = context.LanguageContext.FunctionCallSite;

return site.Target(site, context, func);

}

/// <summary>

/// Creates a FunctionCode object for exec/eval/execfile'd/compile'd code.

///

/// The code is then executed in a specific CodeContext by calling the .Call method.

///

/// If the code is being used for compile (vs. exec/eval/execfile) then it needs to be

/// registered in case our tracing mode changes.

/// </summary>

internal static FunctionCode FromSourceUnit(SourceUnit sourceUnit, PythonCompilerOptions options, bool register) {

var code = PythonContext.CompilePythonCode(sourceUnit, options, ThrowingErrorSink.Default);

if (sourceUnit.CodeProperties == ScriptCodeParseResult.Empty) {

// source span is made up

throw new SyntaxErrorException("unexpected EOF while parsing",

sourceUnit, new SourceSpan(new SourceLocation(0, 1, 1), new SourceLocation(0, 1, 1)), 0, Severity.Error);

}

return ((RunnableScriptCode)code).GetFunctionCode(register);

}

#endregion

#region Private helper functions

private void ExpandArgsTuple(List<string> names, PythonTuple toExpand) {

for (int i = 0; i < toExpand.__len__(); i++) {

if (toExpand[i] is PythonTuple) {

ExpandArgsTuple(names, toExpand[i] as PythonTuple);

} else {

names.Add(toExpand[i] as string);

}

}

}

#endregion

public override bool Equals(object obj) {

// overridden because CPython defines this on code objects

return base.Equals(obj);

}

public override int GetHashCode() {

// overridden because CPython defines this on code objects

return base.GetHashCode();

}

[return: MaybeNotImplemented]

public NotImplementedType __gt__(CodeContext context, object other) => NotImplementedType.Value;

[return: MaybeNotImplemented]

public NotImplementedType __lt__(CodeContext context, object other) => NotImplementedType.Value;

[return: MaybeNotImplemented]

public NotImplementedType __ge__(CodeContext context, object other) => NotImplementedType.Value;

[return: MaybeNotImplemented]

public NotImplementedType __le__(CodeContext context, object other) => NotImplementedType.Value;

/// <summary>

/// Called the 1st time a function is invoked by our OriginalCallTarget* methods

/// over in PythonCallTargets. This computes the real delegate which needs to be

/// created for the function. Usually this means starting off interpretering. It

/// also involves adding the wrapper function for recursion enforcement.

///

/// Because this can race against sys.settrace/setprofile we need to take our

/// _ThreadIsEnumeratingAndAccountingLock to ensure no one is actively changing all

/// of the live functions.

/// </summary>

internal void LazyCompileFirstTarget(PythonFunction function) {

lock (_CodeCreateAndUpdateDelegateLock) {

UpdateDelegate(function.Context.LanguageContext, true);

}

}

/// <summary>

/// Updates the delegate based upon current Python context settings for recursion enforcement

/// and for tracing.

/// </summary>

internal void UpdateDelegate(PythonContext context, bool forceCreation) {

Delegate finalTarget;

if (context.EnableTracing && _lambda != null) {

if (_tracingLambda == null) {

if (!forceCreation) {

if (_lambda is Compiler.Ast.ClassDefinition) return; // ClassDefinition does not have the same signature as call targets

// the user just called sys.settrace(), don't force re-compilation of every method in the system. Instead

// we'll just re-compile them as they're invoked.

PythonCallTargets.GetPythonTargetType(_lambda.ParameterNames.Length > PythonCallTargets.MaxArgs, _lambda.ParameterNames.Length, out Delegate target);

SetTarget(target);

return;

}

_tracingLambda = GetGeneratorOrNormalLambdaTracing(context);

}

if (_tracingDelegate == null) {

_tracingDelegate = CompileLambda(_tracingLambda, new TargetUpdaterForCompilation(context, this).SetCompiledTargetTracing);

}

finalTarget = _tracingDelegate;

} else {

if (_normalDelegate == null) {

if (!forceCreation) {

// we cannot create the delegate when forceCreation is false because we hold the

// _CodeCreateAndUpdateDelegateLock and compiling the delegate may create a FunctionCode

// object which requires the lock.

PythonCallTargets.GetPythonTargetType(_lambda.ParameterNames.Length > PythonCallTargets.MaxArgs, _lambda.ParameterNames.Length, out Delegate target);

SetTarget(target);

return;

}

_normalDelegate = CompileLambda(GetGeneratorOrNormalLambda(), new TargetUpdaterForCompilation(context, this).SetCompiledTarget);

}

finalTarget = _normalDelegate;

}

finalTarget = AddRecursionCheck(context, finalTarget);

SetTarget(finalTarget);

}

/// <summary>

/// Called to set the initial target delegate when the user has passed -X:Debug to enable

/// .NET style debugging.

/// </summary>

internal void SetDebugTarget(PythonContext context, Delegate target) {

_normalDelegate = target;

SetTarget(AddRecursionCheck(context, target));

}

/// <summary>

/// Gets the LambdaExpression for tracing.

///

/// If this is a generator function code then the lambda gets tranformed into the correct generator code.

/// </summary>

private LambdaExpression GetGeneratorOrNormalLambdaTracing(PythonContext context) {

var debugProperties = new PythonDebuggingPayload(this);

var debugInfo = new DebugLambdaInfo(

null, // IDebugCompilerSupport

null, // lambda alias

false, // optimize for leaf frames

null, // hidden variables

null, // variable aliases

debugProperties // custom payload

);

if ((Flags & FunctionAttributes.Generator) == 0) {

return context.DebugContext.TransformLambda((LambdaExpression)Compiler.Ast.Node.RemoveFrame(_lambda.GetLambda()), debugInfo);

}

return Expression.Lambda(

Code.Type,

new GeneratorRewriter(

_lambda.Name,

Compiler.Ast.Node.RemoveFrame(Code.Body)

).Reduce(

_lambda.ShouldInterpret,

_lambda.EmitDebugSymbols,

context.Options.CompilationThreshold,

Code.Parameters,

x => (Expression<Func<MutableTuple, object>>)context.DebugContext.TransformLambda(x, debugInfo)

),

Code.Name,

Code.Parameters

);

}

/// <summary>

/// Gets the correct final LambdaExpression for this piece of code.

///

/// This is either just _lambda or _lambda re-written to be a generator expression.

/// </summary>

private LightLambdaExpression GetGeneratorOrNormalLambda() {

LightLambdaExpression finalCode;

if ((Flags & FunctionAttributes.Generator) == 0) {

finalCode = Code;

} else {

finalCode = Code.ToGenerator(

_lambda.ShouldInterpret,

_lambda.EmitDebugSymbols,

_lambda.GlobalParent.PyContext.Options.CompilationThreshold

);

}

return finalCode;

}

private Delegate CompileLambda(LightLambdaExpression code, EventHandler<LightLambdaCompileEventArgs> handler) {

#if EMIT_PDB

if (_lambda.EmitDebugSymbols) {

return CompilerHelpers.CompileToMethod((LambdaExpression)code.Reduce(), DebugInfoGenerator.CreatePdbGenerator(), true);

}

#endif

if (_lambda.ShouldInterpret) {

Delegate result = code.Compile(_lambda.GlobalParent.PyContext.Options.CompilationThreshold);

// If the adaptive compiler decides to compile this function, we

// want to store the new compiled target. This saves us from going

// through the interpreter stub every call.

if (result.Target is LightLambda lightLambda) {

lightLambda.Compile += handler;

}

return result;

}

return code.Compile();

}

private Delegate CompileLambda(LambdaExpression code, EventHandler<LightLambdaCompileEventArgs> handler) {

#if EMIT_PDB

if (_lambda.EmitDebugSymbols) {

return CompilerHelpers.CompileToMethod(code, DebugInfoGenerator.CreatePdbGenerator(), true);

}

#endif

if (_lambda.ShouldInterpret) {

Delegate result = CompilerHelpers.LightCompile(code, _lambda.GlobalParent.PyContext.Options.CompilationThreshold);

// If the adaptive compiler decides to compile this function, we

// want to store the new compiled target. This saves us from going

// through the interpreter stub every call.

if (result.Target is LightLambda lightLambda) {

lightLambda.Compile += handler;

}

return result;

}

return code.Compile();

}

internal Delegate AddRecursionCheck(PythonContext context, Delegate finalTarget) {

if (context.RecursionLimit != Int32.MaxValue) {

if (finalTarget is Func<CodeContext, CodeContext> ||

finalTarget is Func<FunctionCode, object> ||

finalTarget is LookupCompilationDelegate) {

// no recursion enforcement on classes or modules

return finalTarget;

}

switch (_lambda.ParameterNames.Length) {

#region Generated Python Recursion Delegate Switch

// *** BEGIN GENERATED CODE ***

// generated by function: gen_recursion_delegate_switch from: generate_calls.py

case 0:

finalTarget = new Func<PythonFunction, object>(new PythonFunctionRecursionCheck0((Func<PythonFunction, object>)finalTarget).CallTarget);

break;

case 1:

finalTarget = new Func<PythonFunction, object, object>(new PythonFunctionRecursionCheck1((Func<PythonFunction, object, object>)finalTarget).CallTarget);

break;

case 2:

finalTarget = new Func<PythonFunction, object, object, object>(new PythonFunctionRecursionCheck2((Func<PythonFunction, object, object, object>)finalTarget).CallTarget);

break;

case 3:

finalTarget = new Func<PythonFunction, object, object, object, object>(new PythonFunctionRecursionCheck3((Func<PythonFunction, object, object, object, object>)finalTarget).CallTarget);

break;

case 4:

finalTarget = new Func<PythonFunction, object, object, object, object, object>(new PythonFunctionRecursionCheck4((Func<PythonFunction, object, object, object, object, object>)finalTarget).CallTarget);

break;

case 5:

finalTarget = new Func<PythonFunction, object, object, object, object, object, object>(new PythonFunctionRecursionCheck5((Func<PythonFunction, object, object, object, object, object, object>)finalTarget).CallTarget);

break;

case 6:

finalTarget = new Func<PythonFunction, object, object, object, object, object, object, object>(new PythonFunctionRecursionCheck6((Func<PythonFunction, object, object, object, object, object, object, object>)finalTarget).CallTarget);

break;

case 7:

finalTarget = new Func<PythonFunction, object, object, object, object, object, object, object, object>(new PythonFunctionRecursionCheck7((Func<PythonFunction, object, object, object, object, object, object, object, object>)finalTarget).CallTarget);

break;

case 8:

finalTarget = new Func<PythonFunction, object, object, object, object, object, object, object, object, object>(new PythonFunctionRecursionCheck8((Func<PythonFunction, object, object, object, object, object, object, object, object, object>)finalTarget).CallTarget);

break;

case 9:

finalTarget = new Func<PythonFunction, object, object, object, object, object, object, object, object, object, object>(new PythonFunctionRecursionCheck9((Func<PythonFunction, object, object, object, object, object, object, object, object, object, object>)finalTarget).CallTarget);

break;

case 10:

finalTarget = new Func<PythonFunction, object, object, object, object, object, object, object, object, object, object, object>(new PythonFunctionRecursionCheck10((Func<PythonFunction, object, object, object, object, object, object, object, object, object, object, object>)finalTarget).CallTarget);