pythonnet/src/runtime/ClassManager.cs at master · ZXH109030/pythonnet · GitHub

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using System;

using System.Collections.Generic;

using System.Diagnostics;

using System.Linq;

using System.Reflection;

using System.Runtime.InteropServices;

using System.Security;

using Python.Runtime.StateSerialization;

namespace Python.Runtime

{

/// <summary>

/// The ClassManager is responsible for creating and managing instances

/// that implement the Python type objects that reflect managed classes.

/// Each managed type reflected to Python is represented by an instance

/// of a concrete subclass of ClassBase. Each instance is associated with

/// a generated Python type object, whose slots point to static methods

/// of the managed instance's class.

/// </summary>

internal class ClassManager

{

// Binding flags to determine which members to expose in Python.

// This is complicated because inheritance in Python is name

// based. We can't just find DeclaredOnly members, because we

// could have a base class A that defines two overloads of a

// method and a class B that defines two more. The name-based

// descriptor Python will find needs to know about inherited

// overloads as well as those declared on the sub class.

internal static readonly BindingFlags BindingFlags = BindingFlags.Static |

BindingFlags.Instance |

BindingFlags.Public |

BindingFlags.NonPublic;

internal static Dictionary<MaybeType, ReflectedClrType> cache = new(capacity: 128);

private static readonly Type dtype;

private ClassManager()

{

}

static ClassManager()

{

// SEE: https://msdn.microsoft.com/en-us/library/96b1ayy4(v=vs.100).aspx

// ""All delegates inherit from MulticastDelegate, which inherits from Delegate.""

// Was Delegate, which caused a null MethodInfo returned from GetMethode("Invoke")

// and crashed on Linux under Mono.

dtype = typeof(MulticastDelegate);

}

public static void Reset()

{

cache.Clear();

}

internal static void RemoveClasses()

{

foreach (var @class in cache.Values)

{

@class.Dispose();

}

cache.Clear();

}

internal static ClassManagerState SaveRuntimeData()

{

var contexts = new Dictionary<ReflectedClrType, Dictionary<string, object?>>();

foreach (var cls in cache)

{

var cb = (ClassBase)ManagedType.GetManagedObject(cls.Value)!;

var context = cb.Save(cls.Value);

if (context is not null)

{

contexts[cls.Value] = context;

}

// Remove all members added in InitBaseClass.

// this is done so that if domain reloads and a member of a

// reflected dotnet class is removed, it is removed from the

// Python object's dictionary tool; thus raising an AttributeError

// instead of a TypeError.

// Classes are re-initialized on in RestoreRuntimeData.

using var dict = Runtime.PyObject_GenericGetDict(cls.Value);

foreach (var member in cb.dotNetMembers)

{

if ((Runtime.PyDict_DelItemString(dict.Borrow(), member) == -1) &&

(Exceptions.ExceptionMatches(Exceptions.KeyError)))

{

// Trying to remove a key that's not in the dictionary

// raises an error. We don't care about it.

Runtime.PyErr_Clear();

}

else if (Exceptions.ErrorOccurred())

{

throw PythonException.ThrowLastAsClrException();

}

// We modified the Type object, notify it we did.

Runtime.PyType_Modified(cls.Value);

}

return new()

{

Contexts = contexts,

Cache = cache,

};

}

internal static void RestoreRuntimeData(ClassManagerState storage)

{

cache = storage.Cache;

var invalidClasses = new List<KeyValuePair<MaybeType, ReflectedClrType>>();

var contexts = storage.Contexts;

foreach (var pair in cache)

{

var context = contexts[pair.Value];

if (pair.Key.Valid)

{

pair.Value.Restore(context);

}

else

{

invalidClasses.Add(pair);

var cb = new UnloadedClass(pair.Key.Name);

cb.Load(pair.Value, context);

pair.Value.Restore(cb);

}

/// <summary>

/// Return the ClassBase-derived instance that implements a particular

/// reflected managed type, creating it if it doesn't yet exist.

/// </summary>

internal static BorrowedReference GetClass(Type type) => ReflectedClrType.GetOrCreate(type);

internal static ClassBase GetClassImpl(Type type)

{

var pyType = GetClass(type);

var impl = (ClassBase)ManagedType.GetManagedObject(pyType)!;

Debug.Assert(impl is not null);

return impl!;

}

/// <summary>

/// Create a new ClassBase-derived instance that implements a reflected

/// managed type. The new object will be associated with a generated

/// Python type object.

/// </summary>

internal static ClassBase CreateClass(Type type)

{

// Next, select the appropriate managed implementation class.

// Different kinds of types, such as array types or interface

// types, want to vary certain implementation details to make

// sure that the type semantics are consistent in Python.

ClassBase impl;

// Check to see if the given type extends System.Exception. This

// lets us check once (vs. on every lookup) in case we need to

// wrap Exception-derived types in old-style classes

if (type.ContainsGenericParameters)

{

impl = new GenericType(type);

}

else if (type.IsSubclassOf(dtype))

{

impl = new DelegateObject(type);

}

else if (type.IsArray)

{

impl = new ArrayObject(type);

}

else if (type.IsInterface)

{

impl = new InterfaceObject(type);

}

else if (type == typeof(Exception) ||

type.IsSubclassOf(typeof(Exception)))

{

impl = new ExceptionClassObject(type);

}

#pragma warning disable CS0618 // Type or member is obsolete. OK for internal use.

else if (null != PythonDerivedType.GetPyObjField(type))

#pragma warning restore CS0618 // Type or member is obsolete

{

impl = new ClassDerivedObject(type);

}

else

{

impl = new ClassObject(type);

}

return impl;

}

internal static void InitClassBase(Type type, ClassBase impl, ReflectedClrType pyType)

{

// First, we introspect the managed type and build some class

// information, including generating the member descriptors

// that we'll be putting in the Python class __dict__.

ClassInfo info = GetClassInfo(type, impl);

impl.indexer = info.indexer;

impl.richcompare.Clear();

// Finally, initialize the class __dict__ and return the object.

using var newDict = Runtime.PyObject_GenericGetDict(pyType.Reference);

BorrowedReference dict = newDict.Borrow();

foreach (var iter in info.members)

{

var item = iter.Value;

var name = iter.Key;

impl.dotNetMembers.Add(name);

Runtime.PyDict_SetItemString(dict, name, item);

if (ClassBase.CilToPyOpMap.TryGetValue(name, out var pyOp)

// workaround for unintialized types crashing in GetManagedObject

&& item is not ReflectedClrType

&& ManagedType.GetManagedObject(item) is MethodObject method)

{

impl.richcompare.Add(pyOp, method);

}

// If class has constructors, generate an __doc__ attribute.

NewReference doc = default;

Type marker = typeof(DocStringAttribute);

var attrs = (Attribute[])type.GetCustomAttributes(marker, false);

if (attrs.Length != 0)

{

var attr = (DocStringAttribute)attrs[0];

string docStr = attr.DocString;

doc = Runtime.PyString_FromString(docStr);

Runtime.PyDict_SetItem(dict, PyIdentifier.__doc__, doc.Borrow());

}

// If this is a ClassObject AND it has constructors, generate a __doc__ attribute.

// required that the ClassObject.ctors be changed to internal

if (impl is ClassObject co)

{

if (co.NumCtors > 0 && !co.HasCustomNew())

{

// Implement Overloads on the class object

if (!CLRModule._SuppressOverloads)

{

// HACK: __init__ points to instance constructors.

// When unbound they fully instantiate object, so we get overloads for free from MethodBinding.

var init = info.members["__init__"];

// TODO: deprecate __overloads__ soon...

Runtime.PyDict_SetItem(dict, PyIdentifier.__overloads__, init);

Runtime.PyDict_SetItem(dict, PyIdentifier.Overloads, init);

}

// don't generate the docstring if one was already set from a DocStringAttribute.

if (!CLRModule._SuppressDocs && doc.IsNull())

{

doc = co.GetDocString();

Runtime.PyDict_SetItem(dict, PyIdentifier.__doc__, doc.Borrow());

}

if (Runtime.PySequence_Contains(dict, PyIdentifier.__doc__) != 1)

{

// Ensure that at least some doc string is set

using var fallbackDoc = Runtime.PyString_FromString(

$"Python wrapper for .NET type {type}"

);

Runtime.PyDict_SetItem(dict, PyIdentifier.__doc__, fallbackDoc.Borrow());

}

doc.Dispose();

// The type has been modified after PyType_Ready has been called

// Refresh the type

Runtime.PyType_Modified(pyType.Reference);

}

internal static bool ShouldBindMethod(MethodBase mb)

{

if (mb is null) throw new ArgumentNullException(nameof(mb));

return (mb.IsPublic || mb.IsFamily || mb.IsFamilyOrAssembly);

}

internal static bool ShouldBindField(FieldInfo fi)

{

if (fi is null) throw new ArgumentNullException(nameof(fi));

return (fi.IsPublic || fi.IsFamily || fi.IsFamilyOrAssembly);

}

internal static bool ShouldBindProperty(PropertyInfo pi)

{

MethodInfo? mm;

try

{

mm = pi.GetGetMethod(true);

if (mm == null)

{

mm = pi.GetSetMethod(true);

}

catch (SecurityException)

{

// GetGetMethod may try to get a method protected by

// StrongNameIdentityPermission - effectively private.

return false;

}

if (mm == null)

{

return false;

}

return ShouldBindMethod(mm);

}

internal static bool ShouldBindEvent(EventInfo ei)

{

return ei.GetAddMethod(true) is { } add && ShouldBindMethod(add);

}

private static ClassInfo GetClassInfo(Type type, ClassBase impl)

{

var ci = new ClassInfo();

var methods = new Dictionary<string, List<MethodBase>>();

MethodInfo meth;

ExtensionType ob;

string name;

Type tp;

int i, n;

MemberInfo[] info = type.GetMembers(BindingFlags);

var local = new HashSet<string>();

var items = new List<MemberInfo>();

MemberInfo m;

// Loop through once to find out which names are declared

for (i = 0; i < info.Length; i++)

{

m = info[i];

if (m.DeclaringType == type)

{

local.Add(m.Name);

}

if (type.IsEnum)

{

var opsImpl = typeof(EnumOps<>).MakeGenericType(type);

foreach (var op in opsImpl.GetMethods(OpsHelper.BindingFlags))

{

local.Add(op.Name);

}

info = info.Concat(opsImpl.GetMethods(OpsHelper.BindingFlags)).ToArray();

// only [Flags] enums support bitwise operations

if (type.IsFlagsEnum())

{

opsImpl = typeof(FlagEnumOps<>).MakeGenericType(type);

foreach (var op in opsImpl.GetMethods(OpsHelper.BindingFlags))

{

local.Add(op.Name);

}

info = info.Concat(opsImpl.GetMethods(OpsHelper.BindingFlags)).ToArray();

}

// Now again to filter w/o losing overloaded member info

for (i = 0; i < info.Length; i++)

{

m = info[i];

if (local.Contains(m.Name))

{

items.Add(m);

}

if (type.IsInterface)

{

// Interface inheritance seems to be a different animal:

// more contractual, less structural. Thus, a Type that

// represents an interface that inherits from another

// interface does not return the inherited interface's

// methods in GetMembers. For example ICollection inherits

// from IEnumerable, but ICollection's GetMemebers does not

// return GetEnumerator.

// Not sure if this is the correct way to fix this, but it

// seems to work. Thanks to Bruce Dodson for the fix.

Type[] inheritedInterfaces = type.GetInterfaces();

for (i = 0; i < inheritedInterfaces.Length; ++i)

{

Type inheritedType = inheritedInterfaces[i];

MemberInfo[] imembers = inheritedType.GetMembers(BindingFlags);

for (n = 0; n < imembers.Length; n++)

{

m = imembers[n];

if (!local.Contains(m.Name))

{

items.Add(m);

}

// All interface implementations inherit from Object,

// but GetMembers don't return them either.

var objFlags = BindingFlags.Public | BindingFlags.Instance;

foreach (var mi in typeof(object).GetMembers(objFlags))

{

if (!local.Contains(mi.Name) && mi is not ConstructorInfo)

{

items.Add(mi);

}

for (i = 0; i < items.Count; i++)

{

var mi = (MemberInfo)items[i];

switch (mi.MemberType)

{

case MemberTypes.Method:

meth = (MethodInfo)mi;

if (!ShouldBindMethod(meth))

{

continue;

}

name = meth.Name;

//TODO mangle?

if (name == "__init__" && !impl.HasCustomNew())

continue;

if (!methods.TryGetValue(name, out var methodList))

{

methodList = methods[name] = new List<MethodBase>();

}

methodList.Add(meth);

continue;

case MemberTypes.Constructor when !impl.HasCustomNew():

var ctor = (ConstructorInfo)mi;

if (ctor.IsStatic)

{

continue;

}

name = "__init__";

if (!methods.TryGetValue(name, out methodList))

{

methodList = methods[name] = new List<MethodBase>();

}

methodList.Add(ctor);

continue;

case MemberTypes.Property:

var pi = (PropertyInfo)mi;

if(!ShouldBindProperty(pi))

{

continue;

}

// Check for indexer

ParameterInfo[] args = pi.GetIndexParameters();

if (args.GetLength(0) > 0)

{

Indexer? idx = ci.indexer;

if (idx == null)

{

ci.indexer = new Indexer();

idx = ci.indexer;

}

idx.AddProperty(pi);

continue;

}

ob = new PropertyObject(pi);

ci.members[pi.Name] = ob.AllocObject();

continue;

case MemberTypes.Field:

var fi = (FieldInfo)mi;

if (!ShouldBindField(fi))

{

continue;

}

ob = new FieldObject(fi);

ci.members[mi.Name] = ob.AllocObject();

continue;

case MemberTypes.Event:

var ei = (EventInfo)mi;

if (!ShouldBindEvent(ei))

{

continue;

}

ob = ei.AddMethod.IsStatic

? new EventBinding(ei)

: new EventObject(ei);

ci.members[ei.Name] = ob.AllocObject();

continue;

case MemberTypes.NestedType:

tp = (Type)mi;

if (!(tp.IsNestedPublic || tp.IsNestedFamily ||

tp.IsNestedFamORAssem))

{

continue;

}

// Note the given instance might be uninitialized

var pyType = GetClass(tp);

// make a copy, that could be disposed later

ci.members[mi.Name] = new ReflectedClrType(pyType);

continue;

}

foreach (var iter in methods)

{

name = iter.Key;

var mlist = iter.Value.ToArray();

ob = new MethodObject(type, name, mlist);

ci.members[name] = ob.AllocObject();

if (mlist.Any(OperatorMethod.IsOperatorMethod))

{

string pyName = OperatorMethod.GetPyMethodName(name);

string pyNameReverse = OperatorMethod.ReversePyMethodName(pyName);

OperatorMethod.FilterMethods(mlist, out var forwardMethods, out var reverseMethods);

// Only methods where the left operand is the declaring type.

if (forwardMethods.Length > 0)

ci.members[pyName] = new MethodObject(type, name, forwardMethods).AllocObject();

// Only methods where only the right operand is the declaring type.

if (reverseMethods.Length > 0)

ci.members[pyNameReverse] = new MethodObject(type, name, reverseMethods, argsReversed: true).AllocObject();

}

if (ci.indexer == null && type.IsClass)

{

// Indexer may be inherited.

var parent = type.BaseType;

while (parent != null && ci.indexer == null)

{

foreach (var prop in parent.GetProperties()) {

var args = prop.GetIndexParameters();

if (args.GetLength(0) > 0)

{

ci.indexer = new Indexer();

ci.indexer.AddProperty(prop);

break;

}

parent = parent.BaseType;

}

return ci;

}

/// <summary>

/// This class owns references to PyObjects in the `members` member.

/// The caller has responsibility to DECREF them.

/// </summary>

private class ClassInfo

{

public Indexer? indexer;

public readonly Dictionary<string, PyObject> members = new();

internal ClassInfo()

{

indexer = null;

}

pythonnet/src/runtime/ClassManager.cs at master · ZXH109030/pythonnet · GitHub

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