pythonnet/src/runtime/native/ABI.cs at master · sdpython/pythonnet · GitHub

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namespace Python.Runtime.Native

{

using System;

using System.Globalization;

using System.Linq;

using System.Reflection;

using System.Runtime.InteropServices;

static class ABI

{

internal static void Initialize(Version version, BorrowedReference pyType)

{

string offsetsClassSuffix = string.Format(CultureInfo.InvariantCulture,

"{0}{1}", version.Major, version.Minor);

var thisAssembly = Assembly.GetExecutingAssembly();

const string nativeTypeOffsetClassName = "Python.Runtime.NativeTypeOffset";

string className = "Python.Runtime.TypeOffset" + offsetsClassSuffix;

Type typeOffsetsClass =

// Try platform native offsets first. It is only present when generated by setup.py

thisAssembly.GetType(nativeTypeOffsetClassName, throwOnError: false)

?? thisAssembly.GetType(className, throwOnError: false);

if (typeOffsetsClass is null)

{

var types = thisAssembly.GetTypes().Select(type => type.Name).Where(name => name.StartsWith("TypeOffset"));

string message = $"Searching for {className}, found {string.Join(",", types)}. " +

"If you are building Python.NET from source, make sure you have run 'python setup.py configure' to fill in configured.props";

throw new NotSupportedException($"Python ABI v{version} is not supported: {message}");

}

var typeOffsets = (ITypeOffsets)Activator.CreateInstance(typeOffsetsClass);

TypeOffset.Use(typeOffsets);

ManagedDataOffsets.Magic = Marshal.ReadInt32(pyType.DangerousGetAddress(), TypeOffset.tp_basicsize);

}