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Copy pathmanagedtype.cs
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97 lines (76 loc) · 3.61 KB
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// ==========================================================================
// This software is subject to the provisions of the Zope Public License,
// Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution.
// THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
// WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
// FOR A PARTICULAR PURPOSE.
// ==========================================================================
using System;
using System.Runtime.InteropServices;
using System.Collections;
using System.Reflection;
namespace Python.Runtime {
//========================================================================
// 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.
//========================================================================
internal abstract class ManagedType {
internal GCHandle gcHandle; // Native handle
internal IntPtr pyHandle; // PyObject *
internal IntPtr tpHandle; // PyType *
//====================================================================
// Given a Python object, return the associated managed object or null.
//====================================================================
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;
}
int flags = (int)Marshal.ReadIntPtr(tp, TypeOffset.tp_flags);
if ((flags & TypeFlags.Managed) != 0) {
IntPtr op = (tp == ob) ?
Marshal.ReadIntPtr(tp, TypeOffset.magic()) :
Marshal.ReadIntPtr(ob, ObjectOffset.magic());
GCHandle gc = (GCHandle)op;
return (ManagedType)gc.Target;
}
// In certain situations, we need to recognize a wrapped
// exception class and be willing to unwrap the class :(
if (Runtime.wrap_exceptions) {
IntPtr e = Exceptions.UnwrapExceptionClass(ob);
if ((e != IntPtr.Zero) && (e != ob)) {
ManagedType m = GetManagedObject(e);
Runtime.Decref(e);
return m;
}
}
}
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;
}
int flags = (int)Marshal.ReadIntPtr(tp, TypeOffset.tp_flags);
if ((flags & TypeFlags.Managed) != 0) {
return true;
}
}
return false;
}
}
}