pythonnet/src/runtime/Interop.cs at master · ZeroMSN/pythonnet · GitHub

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using System;

using System.Collections.Generic;

using System.Diagnostics;

using System.Linq;

using System.Runtime.InteropServices;

using Python.Runtime.Reflection;

using System.Reflection;

namespace Python.Runtime

{

/// <summary>

/// This file defines objects to support binary interop with the Python

/// runtime. Generally, the definitions here need to be kept up to date

/// when moving to new Python versions.

/// </summary>

[Serializable]

[AttributeUsage(AttributeTargets.All)]

public class DocStringAttribute : Attribute

{

public DocStringAttribute(string docStr)

{

DocString = docStr;

}

public string DocString { get; }

}

[Serializable]

[AttributeUsage(AttributeTargets.Method | AttributeTargets.Delegate)]

internal class ModuleFunctionAttribute : Attribute

{

public ModuleFunctionAttribute()

{

}

[Serializable]

[AttributeUsage(AttributeTargets.Method | AttributeTargets.Delegate)]

internal class ForbidPythonThreadsAttribute : Attribute

{

public ForbidPythonThreadsAttribute()

{

}

[Serializable]

[AttributeUsage(AttributeTargets.Property)]

internal class ModulePropertyAttribute : Attribute

{

public ModulePropertyAttribute()

{

}

/// <summary>

/// TypeFlags(): The actual bit values for the Type Flags stored

/// in a class.

/// Note that the two values reserved for stackless have been put

/// to good use as PythonNet specific flags (Managed and Subclass)

/// </summary>

// Py_TPFLAGS_*

[Flags]

public enum TypeFlags: long

{

HeapType = (1 << 9),

BaseType = (1 << 10),

Ready = (1 << 12),

Readying = (1 << 13),

HaveGC = (1 << 14),

// 15 and 16 are reserved for stackless

HaveStacklessExtension = 0,

/* XXX Reusing reserved constants */

/// <remarks>PythonNet specific</remarks>

HasClrInstance = (1 << 15),

/// <remarks>PythonNet specific</remarks>

Subclass = (1 << 16),

/* Objects support nb_index in PyNumberMethods */

HaveVersionTag = (1 << 18),

ValidVersionTag = (1 << 19),

IsAbstract = (1 << 20),

HaveNewBuffer = (1 << 21),

// TODO: Implement FastSubclass functions

IntSubclass = (1 << 23),

LongSubclass = (1 << 24),

ListSubclass = (1 << 25),

TupleSubclass = (1 << 26),

StringSubclass = (1 << 27),

UnicodeSubclass = (1 << 28),

DictSubclass = (1 << 29),

BaseExceptionSubclass = (1 << 30),

TypeSubclass = (1 << 31),

Default = (

HaveStacklessExtension |

HaveVersionTag),

}

// This class defines the function prototypes (delegates) used for low

// level integration with the CPython runtime. It also provides name

// based lookup of the correct prototype for a particular Python type

// slot and utilities for generating method thunks for managed methods.

internal class Interop

{

static readonly Dictionary<MethodInfo, Type> delegateTypes = new();

internal static Type GetPrototype(MethodInfo method)

{

if (delegateTypes.TryGetValue(method, out var delegateType))

return delegateType;

var parameters = method.GetParameters().Select(p => new ParameterHelper(p)).ToArray();

foreach (var candidate in typeof(Interop).GetNestedTypes())

{

if (!typeof(Delegate).IsAssignableFrom(candidate))

continue;

MethodInfo invoke = candidate.GetMethod("Invoke");

var candiateParameters = invoke.GetParameters();

if (candiateParameters.Length != parameters.Length)

continue;

var parametersMatch = parameters.Zip(candiateParameters,

(expected, actual) => expected.Matches(actual))

.All(matches => matches);

if (!parametersMatch) continue;

if (invoke.ReturnType != method.ReturnType) continue;

delegateTypes.Add(method, candidate);

return candidate;

}

throw new NotImplementedException(method.ToString());

}

internal static Dictionary<IntPtr, Delegate> allocatedThunks = new();

internal static ThunkInfo GetThunk(MethodInfo method)

{

Type dt = GetPrototype(method);

Delegate d = Delegate.CreateDelegate(dt, method);

return GetThunk(d);

}

internal static ThunkInfo GetThunk(Delegate @delegate)

{

var info = new ThunkInfo(@delegate);

allocatedThunks[info.Address] = @delegate;

return info;

}