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Copy pathmanagedtype.cs
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79 lines (70 loc) · 2.42 KB
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using System;
using System.Runtime.InteropServices;
namespace Python.Runtime
{
/// <summary>
/// Common base class for all objects that are implemented in managed
/// code. It defines the common fields that associate CLR and Python
/// objects and common utilities to convert between those identities.
/// </summary>
internal abstract class ManagedType
{
internal GCHandle gcHandle; // Native handle
internal IntPtr pyHandle; // PyObject *
internal IntPtr tpHandle; // PyType *
/// <summary>
/// Given a Python object, return the associated managed object or null.
/// </summary>
internal static ManagedType GetManagedObject(IntPtr ob)
{
if (ob != IntPtr.Zero)
{
IntPtr tp = Runtime.PyObject_TYPE(ob);
if (tp == Runtime.PyTypeType || tp == Runtime.PyCLRMetaType)
{
tp = ob;
}
var flags = Util.ReadCLong(tp, TypeOffset.tp_flags);
if ((flags & TypeFlags.Managed) != 0)
{
IntPtr op = tp == ob
? Marshal.ReadIntPtr(tp, TypeOffset.magic())
: Marshal.ReadIntPtr(ob, ObjectOffset.magic(ob));
if (op == IntPtr.Zero)
{
return null;
}
var gc = (GCHandle)op;
return (ManagedType)gc.Target;
}
}
return null;
}
internal static ManagedType GetManagedObjectErr(IntPtr ob)
{
ManagedType result = GetManagedObject(ob);
if (result == null)
{
Exceptions.SetError(Exceptions.TypeError, "invalid argument, expected CLR type");
}
return result;
}
internal static bool IsManagedType(IntPtr ob)
{
if (ob != IntPtr.Zero)
{
IntPtr tp = Runtime.PyObject_TYPE(ob);
if (tp == Runtime.PyTypeType || tp == Runtime.PyCLRMetaType)
{
tp = ob;
}
var flags = Util.ReadCLong(tp, TypeOffset.tp_flags);
if ((flags & TypeFlags.Managed) != 0)
{
return true;
}
}
return false;
}
}
}