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177 lines (144 loc) · 6.02 KB
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#nullable enable
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using Python.Runtime.Native;
namespace Python.Runtime
{
[Serializable]
public class PyType : PyObject
{
/// <summary>Creates heap type object from the <paramref name="spec"/>.</summary>
public PyType(TypeSpec spec, PyTuple? bases = null) : base(FromSpec(spec, bases)) { }
/// <summary>Wraps an existing type object.</summary>
public PyType(PyObject o) : base(FromObject(o)) { }
internal PyType(PyType o)
: base(o is not null ? o.Reference : throw new ArgumentNullException(nameof(o)))
{
}
internal PyType(BorrowedReference reference, bool prevalidated = false) : base(reference)
{
if (prevalidated) return;
if (!Runtime.PyType_Check(this.Handle))
throw new ArgumentException("object is not a type");
}
internal PyType(in StolenReference reference) : base(EnsureIsType(in reference))
{
}
internal new static PyType? FromNullableReference(BorrowedReference reference)
=> reference == null
? null
: new PyType(new NewReference(reference).Steal());
internal static PyType FromReference(BorrowedReference reference)
=> FromNullableReference(reference) ?? throw new ArgumentNullException(nameof(reference));
public string Name
{
get
{
var namePtr = new StrPtr
{
RawPointer = Marshal.ReadIntPtr(Handle, TypeOffset.tp_name),
};
return namePtr.ToString(System.Text.Encoding.UTF8)!;
}
}
/// <summary>Returns <c>true</c> when type is fully initialized</summary>
public bool IsReady => Flags.HasFlag(TypeFlags.Ready);
internal TypeFlags Flags
{
get => (TypeFlags)Util.ReadCLong(Handle, TypeOffset.tp_flags);
set => Util.WriteCLong(Handle, TypeOffset.tp_flags, (long)value);
}
/// <summary>Checks if specified object is a Python type.</summary>
public static bool IsType(PyObject value)
{
if (value is null) throw new ArgumentNullException(nameof(value));
return Runtime.PyType_Check(value.obj);
}
/// <summary>Checks if specified object is a Python type.</summary>
internal static bool IsType(BorrowedReference value)
{
return Runtime.PyType_Check(value.DangerousGetAddress());
}
/// <summary>
/// Gets <see cref="PyType"/>, which represents the specified CLR type.
/// </summary>
public static PyType Get(Type clrType)
{
if (clrType is null)
{
throw new ArgumentNullException(nameof(clrType));
}
return new PyType(TypeManager.GetType(clrType));
}
internal BorrowedReference BaseReference
{
get => GetBase(Reference);
set
{
var old = BaseReference.DangerousGetAddressOrNull();
IntPtr @new = value.DangerousGetAddress();
Runtime.XIncref(@new);
Marshal.WriteIntPtr(Handle, TypeOffset.tp_base, @new);
Runtime.XDecref(old);
}
}
internal IntPtr GetSlot(TypeSlotID slot)
{
IntPtr result = Runtime.PyType_GetSlot(this.Reference, slot);
return Exceptions.ErrorCheckIfNull(result);
}
internal static TypeFlags GetFlags(BorrowedReference type)
{
Debug.Assert(TypeOffset.tp_flags > 0);
return (TypeFlags)Util.ReadCLong(type.DangerousGetAddress(), TypeOffset.tp_flags);
}
internal static BorrowedReference GetBase(BorrowedReference type)
{
Debug.Assert(IsType(type));
IntPtr basePtr = Marshal.ReadIntPtr(type.DangerousGetAddress(), TypeOffset.tp_base);
return new BorrowedReference(basePtr);
}
internal static BorrowedReference GetBases(BorrowedReference type)
{
Debug.Assert(IsType(type));
IntPtr basesPtr = Marshal.ReadIntPtr(type.DangerousGetAddress(), TypeOffset.tp_bases);
return new BorrowedReference(basesPtr);
}
internal static BorrowedReference GetMRO(BorrowedReference type)
{
Debug.Assert(IsType(type));
IntPtr basesPtr = Marshal.ReadIntPtr(type.DangerousGetAddress(), TypeOffset.tp_mro);
return new BorrowedReference(basesPtr);
}
private static IntPtr EnsureIsType(in StolenReference reference)
{
IntPtr address = reference.DangerousGetAddressOrNull();
if (address == IntPtr.Zero)
throw new ArgumentNullException(nameof(reference));
return EnsureIsType(address);
}
private static IntPtr EnsureIsType(IntPtr ob)
=> Runtime.PyType_Check(ob)
? ob
: throw new ArgumentException("object is not a type");
private static BorrowedReference FromObject(PyObject o)
{
if (o is null) throw new ArgumentNullException(nameof(o));
if (!IsType(o)) throw new ArgumentException("object is not a type");
return o.Reference;
}
private static IntPtr FromSpec(TypeSpec spec, PyTuple? bases = null)
{
if (spec is null) throw new ArgumentNullException(nameof(spec));
if ((spec.Flags & TypeFlags.HeapType) == 0)
throw new NotSupportedException("Only heap types are supported");
var nativeSpec = new NativeTypeSpec(spec);
var basesRef = bases is null ? default : bases.Reference;
var result = Runtime.PyType_FromSpecWithBases(in nativeSpec, basesRef);
PythonException.ThrowIfIsNull(result);
nativeSpec.Dispose();
return result.DangerousMoveToPointer();
}
}
}