pythonnet/src/runtime/TypeManager.cs at gitpod · Peter-ouyang/pythonnet · GitHub

Repository navigation

History

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

320

321

322

323

324

325

326

327

328

329

330

331

332

333

334

335

336

337

338

339

340

341

342

343

344

345

346

347

348

349

350

351

352

353

354

355

356

357

358

359

360

361

362

363

364

365

366

367

368

369

370

371

372

373

374

375

376

377

378

379

380

381

382

383

384

385

386

387

388

389

390

391

392

393

394

395

396

397

398

399

400

401

402

403

404

405

406

407

408

409

410

411

412

413

414

415

416

417

418

419

420

421

422

423

424

425

426

427

428

429

430

431

432

433

434

435

436

437

438

439

440

441

442

443

444

445

446

447

448

449

450

451

452

453

454

455

456

457

458

459

460

461

462

463

464

465

466

467

468

469

470

471

472

473

474

475

476

477

478

479

480

481

482

483

484

485

486

487

488

489

490

491

492

493

494

495

496

497

498

499

500

501

502

503

504

505

506

507

508

509

510

511

512

513

514

515

516

517

518

519

520

521

522

523

524

525

526

527

528

529

530

531

532

533

534

535

536

537

538

539

540

541

542

543

544

545

546

547

548

549

550

551

552

553

554

555

556

557

558

559

560

561

562

563

564

565

566

567

568

569

570

571

572

573

574

575

576

577

578

579

580

581

582

583

584

585

586

587

588

589

590

591

592

593

594

595

596

597

598

599

600

601

602

603

604

605

606

607

608

609

610

611

612

613

614

615

616

617

618

619

620

621

622

623

624

625

626

627

628

629

630

631

632

633

634

635

636

637

638

639

640

641

642

643

644

645

646

647

648

649

650

651

652

653

654

655

656

657

658

659

660

661

662

663

664

665

666

667

668

669

670

671

672

673

674

675

676

677

678

679

680

681

682

683

684

685

686

687

688

689

690

691

692

693

694

695

696

697

698

699

700

701

702

703

704

705

706

707

708

709

710

711

712

713

714

715

716

717

718

719

720

721

722

723

724

725

726

727

728

729

730

731

732

733

734

735

736

737

738

739

740

741

742

743

744

745

746

747

748

749

750

751

752

753

754

755

756

757

758

759

760

761

762

763

764

765

766

767

768

769

770

771

772

773

774

775

776

777

778

779

780

781

782

783

784

785

786

787

788

789

790

791

792

793

794

795

796

797

798

799

800

801

802

803

804

805

806

807

808

809

810

811

812

813

814

815

816

817

818

819

820

821

822

823

824

825

826

827

828

829

830

831

832

833

834

835

836

837

838

839

840

841

842

843

844

845

846

847

848

849

850

851

852

853

854

855

856

857

858

859

860

861

862

863

864

865

866

867

868

869

870

871

872

873

874

875

876

877

878

879

880

881

882

883

884

885

886

887

888

889

890

891

892

893

894

895

896

897

898

899

900

using System;

using System.Collections.Generic;

using System.Linq;

using System.Reflection;

using System.Runtime.InteropServices;

using System.Diagnostics;

using Python.Runtime.Native;

using Python.Runtime.StateSerialization;

namespace Python.Runtime

{

/// <summary>

/// The TypeManager class is responsible for building binary-compatible

/// Python type objects that are implemented in managed code.

/// </summary>

internal class TypeManager

{

internal static IntPtr subtype_traverse;

internal static IntPtr subtype_clear;

#pragma warning disable CS8618 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.

/// <remarks>initialized in <see cref="Initialize"/> rather than in constructor</remarks>

internal static IPythonBaseTypeProvider pythonBaseTypeProvider;

#pragma warning restore CS8618 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.

private const BindingFlags tbFlags = BindingFlags.Public | BindingFlags.Static;

private static Dictionary<MaybeType, PyType> cache = new();

static readonly Dictionary<PyType, SlotsHolder> _slotsHolders = new Dictionary<PyType, SlotsHolder>(PythonReferenceComparer.Instance);

// Slots which must be set

private static readonly string[] _requiredSlots = new string[]

{

"tp_traverse",

"tp_clear",

};

internal static void Initialize()

{

Debug.Assert(cache.Count == 0, "Cache should be empty",

"Some errors may occurred on last shutdown");

using (var plainType = SlotHelper.CreateObjectType())

{

subtype_traverse = Util.ReadIntPtr(plainType.Borrow(), TypeOffset.tp_traverse);

subtype_clear = Util.ReadIntPtr(plainType.Borrow(), TypeOffset.tp_clear);

}

pythonBaseTypeProvider = PythonEngine.InteropConfiguration.pythonBaseTypeProviders;

}

internal static void RemoveTypes()

{

foreach (var type in cache.Values)

{

if (Runtime.HostedInPython

&& _slotsHolders.TryGetValue(type, out var holder))

{

// If refcount > 1, it needs to reset the managed slot,

// otherwise it can dealloc without any trick.

if (Runtime.Refcount(type) > 1)

{

holder.ResetSlots();

}

type.Dispose();

}

cache.Clear();

_slotsHolders.Clear();

}

internal static TypeManagerState SaveRuntimeData()

=> new()

{

Cache = cache,

};

internal static void RestoreRuntimeData(TypeManagerState storage)

{

Debug.Assert(cache == null || cache.Count == 0);

var typeCache = storage.Cache;

foreach (var entry in typeCache)

{

Type type = entry.Key.Value;;

cache![type] = entry.Value;

SlotsHolder holder = CreateSlotsHolder(entry.Value);

InitializeSlots(entry.Value, type, holder);

Runtime.PyType_Modified(entry.Value);

}

internal static PyType GetType(Type type)

{

// Note that these types are cached with a refcount of 1, so they

// effectively exist until the CPython runtime is finalized.

if (!cache.TryGetValue(type, out var pyType))

{

pyType = CreateType(type);

cache[type] = pyType;

}

return pyType;

}

/// <summary>

/// Given a managed Type derived from ExtensionType, get the handle to

/// a Python type object that delegates its implementation to the Type

/// object. These Python type instances are used to implement internal

/// descriptor and utility types like ModuleObject, PropertyObject, etc.

/// </summary>

internal static BorrowedReference GetTypeReference(Type type) => GetType(type).Reference;

/// <summary>

/// The following CreateType implementations do the necessary work to

/// create Python types to represent managed extension types, reflected

/// types, subclasses of reflected types and the managed metatype. The

/// dance is slightly different for each kind of type due to different

/// behavior needed and the desire to have the existing Python runtime

/// do as much of the allocation and initialization work as possible.

/// </summary>

internal static unsafe PyType CreateType(Type impl)

{

// TODO: use PyType(TypeSpec) constructor

PyType type = AllocateTypeObject(impl.Name, metatype: Runtime.PyCLRMetaType);

BorrowedReference base_ = impl == typeof(CLRModule)

? Runtime.PyModuleType

: Runtime.PyBaseObjectType;

type.BaseReference = base_;

int newFieldOffset = InheritOrAllocateStandardFields(type, base_);

int tp_clr_inst_offset = newFieldOffset;

newFieldOffset += IntPtr.Size;

int ob_size = newFieldOffset;

// Set tp_basicsize to the size of our managed instance objects.

Util.WriteIntPtr(type, TypeOffset.tp_basicsize, (IntPtr)ob_size);

Util.WriteInt32(type, ManagedType.Offsets.tp_clr_inst_offset, tp_clr_inst_offset);

Util.WriteIntPtr(type, TypeOffset.tp_new, (IntPtr)Runtime.Delegates.PyType_GenericNew);

SlotsHolder slotsHolder = CreateSlotsHolder(type);

InitializeSlots(type, impl, slotsHolder);

type.Flags = TypeFlags.Default | TypeFlags.HasClrInstance |

TypeFlags.HeapType | TypeFlags.HaveGC;

if (Runtime.PyType_Ready(type) != 0)

{

throw PythonException.ThrowLastAsClrException();

}

using (var dict = Runtime.PyObject_GenericGetDict(type.Reference))

using (var mod = Runtime.PyString_FromString("CLR"))

{

Runtime.PyDict_SetItem(dict.Borrow(), PyIdentifier.__module__, mod.Borrow());

}

// The type has been modified after PyType_Ready has been called

// Refresh the type

Runtime.PyType_Modified(type.Reference);

return type;

}

internal static void InitializeClassCore(Type clrType, PyType pyType, ClassBase impl)

{

if (pyType.BaseReference != null)

{

return;

}

// Hide the gchandle of the implementation in a magic type slot.

GCHandle gc = GCHandle.Alloc(impl);

ManagedType.InitGCHandle(pyType, Runtime.CLRMetaType, gc);

using var baseTuple = GetBaseTypeTuple(clrType);

InitializeBases(pyType, baseTuple);

// core fields must be initialized in partially constructed classes,

// otherwise it would be impossible to manipulate GCHandle and check type size

InitializeCoreFields(pyType);

}

internal static string GetPythonTypeName(Type clrType)

{

var result = new System.Text.StringBuilder();

GetPythonTypeName(clrType, target: result);

return result.ToString();

}

static void GetPythonTypeName(Type clrType, System.Text.StringBuilder target)

{

if (clrType.IsGenericType)

{

string fullName = clrType.GetGenericTypeDefinition().FullName;

int argCountIndex = fullName.LastIndexOf('`');

if (argCountIndex >= 0)

{

string nonGenericFullName = fullName.Substring(0, argCountIndex);

string nonGenericName = CleanupFullName(nonGenericFullName);

target.Append(nonGenericName);

var arguments = clrType.GetGenericArguments();

target.Append('[');

for (int argIndex = 0; argIndex < arguments.Length; argIndex++)

{

if (argIndex != 0)

{

target.Append(',');

}

GetPythonTypeName(arguments[argIndex], target);

}

target.Append(']');

return;

}

string name = CleanupFullName(clrType.FullName);

target.Append(name);

}

static string CleanupFullName(string fullTypeName)

{

// Cleanup the type name to get rid of funny nested type names.

string name = "clr." + fullTypeName;

int i = name.LastIndexOf('+');

if (i > -1)

{

name = name.Substring(i + 1);

}

i = name.LastIndexOf('.');

if (i > -1)

{

name = name.Substring(i + 1);

}

return name;

}

static BorrowedReference InitializeBases(PyType pyType, PyTuple baseTuple)

{

Debug.Assert(baseTuple.Length() > 0);

var primaryBase = baseTuple[0].Reference;

pyType.BaseReference = primaryBase;

if (baseTuple.Length() > 1)

{

Util.WriteIntPtr(pyType, TypeOffset.tp_bases, baseTuple.NewReferenceOrNull().DangerousMoveToPointer());

}

return primaryBase;

}

static void InitializeCoreFields(PyType type)

{

int newFieldOffset = InheritOrAllocateStandardFields(type);

if (ManagedType.IsManagedType(type.BaseReference))

{

int baseClrInstOffset = Util.ReadInt32(type.BaseReference, ManagedType.Offsets.tp_clr_inst_offset);

Util.WriteInt32(type, ManagedType.Offsets.tp_clr_inst_offset, baseClrInstOffset);

}

else

{

Util.WriteInt32(type, ManagedType.Offsets.tp_clr_inst_offset, newFieldOffset);

newFieldOffset += IntPtr.Size;

}

int ob_size = newFieldOffset;

Util.WriteIntPtr(type, TypeOffset.tp_basicsize, (IntPtr)ob_size);

Util.WriteIntPtr(type, TypeOffset.tp_itemsize, IntPtr.Zero);

}

internal static void InitializeClass(PyType type, ClassBase impl, Type clrType)

{

// we want to do this after the slot stuff above in case the class itself implements a slot method

SlotsHolder slotsHolder = CreateSlotsHolder(type);

InitializeSlots(type, impl.GetType(), slotsHolder);

impl.InitializeSlots(type, slotsHolder);

OperatorMethod.FixupSlots(type, clrType);

// Leverage followup initialization from the Python runtime. Note

// that the type of the new type must PyType_Type at the time we

// call this, else PyType_Ready will skip some slot initialization.

if (!type.IsReady && Runtime.PyType_Ready(type) != 0)

{

throw PythonException.ThrowLastAsClrException();

}

var dict = Util.ReadRef(type, TypeOffset.tp_dict);

string mn = clrType.Namespace ?? "";

using (var mod = Runtime.PyString_FromString(mn))

Runtime.PyDict_SetItem(dict, PyIdentifier.__module__, mod.Borrow());

Runtime.PyType_Modified(type.Reference);

//DebugUtil.DumpType(type);

}

static int InheritOrAllocateStandardFields(BorrowedReference type)

{

var @base = Util.ReadRef(type, TypeOffset.tp_base);

return InheritOrAllocateStandardFields(type, @base);

}

static int InheritOrAllocateStandardFields(BorrowedReference typeRef, BorrowedReference @base)

{

IntPtr baseAddress = @base.DangerousGetAddress();

IntPtr type = typeRef.DangerousGetAddress();

int baseSize = Util.ReadInt32(@base, TypeOffset.tp_basicsize);

int newFieldOffset = baseSize;

void InheritOrAllocate(int typeField)

{

int value = Marshal.ReadInt32(baseAddress, typeField);

if (value == 0)

{

Marshal.WriteIntPtr(type, typeField, new IntPtr(newFieldOffset));

newFieldOffset += IntPtr.Size;

}

else

{

Marshal.WriteIntPtr(type, typeField, new IntPtr(value));

}

InheritOrAllocate(TypeOffset.tp_dictoffset);

InheritOrAllocate(TypeOffset.tp_weaklistoffset);

return newFieldOffset;

}

static PyTuple GetBaseTypeTuple(Type clrType)

{

var bases = pythonBaseTypeProvider

.GetBaseTypes(clrType, new PyType[0])

?.ToArray();

if (bases is null || bases.Length == 0)

{

throw new InvalidOperationException("At least one base type must be specified");

}

var nonBases = bases.Where(@base => !@base.Flags.HasFlag(TypeFlags.BaseType)).ToList();

if (nonBases.Count > 0)

{

throw new InvalidProgramException("The specified Python type(s) can not be inherited from: "

+ string.Join(", ", nonBases));

}

return new PyTuple(bases);

}

internal static NewReference CreateSubType(BorrowedReference py_name, BorrowedReference py_base_type, BorrowedReference dictRef)

{

// Utility to create a subtype of a managed type with the ability for the

// a python subtype able to override the managed implementation

string? name = Runtime.GetManagedString(py_name);

if (name is null)

{

Exceptions.SetError(Exceptions.ValueError, "Class name must not be None");

return default;

}

// the derived class can have class attributes __assembly__ and __module__ which

// control the name of the assembly and module the new type is created in.

object? assembly = null;

object? namespaceStr = null;

using (var assemblyKey = new PyString("__assembly__"))

{

var assemblyPtr = Runtime.PyDict_GetItemWithError(dictRef, assemblyKey.Reference);

if (assemblyPtr.IsNull)

{

if (Exceptions.ErrorOccurred()) return default;

}

else if (!Converter.ToManagedValue(assemblyPtr, typeof(string), out assembly, true))

{

return Exceptions.RaiseTypeError("Couldn't convert __assembly__ value to string");

}

using (var namespaceKey = new PyString("__namespace__"))

{

var pyNamespace = Runtime.PyDict_GetItemWithError(dictRef, namespaceKey.Reference);

if (pyNamespace.IsNull)

{

if (Exceptions.ErrorOccurred()) return default;

}

else if (!Converter.ToManagedValue(pyNamespace, typeof(string), out namespaceStr, true))

{

return Exceptions.RaiseTypeError("Couldn't convert __namespace__ value to string");

}

// create the new managed type subclassing the base managed type

var baseClass = ManagedType.GetManagedObject(py_base_type) as ClassBase;

if (null == baseClass)

{

return Exceptions.RaiseTypeError("invalid base class, expected CLR class type");

}

return ReflectedClrType.CreateSubclass(baseClass, name,

ns: (string?)namespaceStr,

assembly: (string?)assembly,

dict: dictRef);

}

internal static IntPtr WriteMethodDef(IntPtr mdef, IntPtr name, IntPtr func, PyMethodFlags flags, IntPtr doc)

{

Marshal.WriteIntPtr(mdef, name);

Marshal.WriteIntPtr(mdef, 1 * IntPtr.Size, func);

Marshal.WriteInt32(mdef, 2 * IntPtr.Size, (int)flags);

Marshal.WriteIntPtr(mdef, 3 * IntPtr.Size, doc);

return mdef + 4 * IntPtr.Size;

}

internal static IntPtr WriteMethodDef(IntPtr mdef, string name, IntPtr func, PyMethodFlags flags = PyMethodFlags.VarArgs,

string? doc = null)

{

IntPtr namePtr = Marshal.StringToHGlobalAnsi(name);

IntPtr docPtr = doc != null ? Marshal.StringToHGlobalAnsi(doc) : IntPtr.Zero;

return WriteMethodDef(mdef, namePtr, func, flags, docPtr);

}

internal static IntPtr WriteMethodDefSentinel(IntPtr mdef)

{

return WriteMethodDef(mdef, IntPtr.Zero, IntPtr.Zero, 0, IntPtr.Zero);

}

internal static void FreeMethodDef(IntPtr mdef)

{

unsafe

{

var def = (PyMethodDef*)mdef;

if (def->ml_name != IntPtr.Zero)

{

Marshal.FreeHGlobal(def->ml_name);

def->ml_name = IntPtr.Zero;

}

if (def->ml_doc != IntPtr.Zero)

{

Marshal.FreeHGlobal(def->ml_doc);

def->ml_doc = IntPtr.Zero;

}

internal static PyType CreateMetatypeWithGCHandleOffset()

{

var py_type = new PyType(Runtime.PyTypeType, prevalidated: true);

int size = Util.ReadInt32(Runtime.PyTypeType, TypeOffset.tp_basicsize)

+ IntPtr.Size // tp_clr_inst_offset

;

var result = new PyType(new TypeSpec("clr._internal.GCOffsetBase", basicSize: size,

new TypeSpec.Slot[]

{

TypeFlags.Default | TypeFlags.HeapType | TypeFlags.HaveGC),

bases: new PyTuple(new[] { py_type }));

SetRequiredSlots(result, seen: new HashSet<string>());

Runtime.PyType_Modified(result);

return result;

}

internal static PyType CreateMetaType(Type impl, out SlotsHolder slotsHolder)

{

// The managed metatype is functionally little different than the

// standard Python metatype (PyType_Type). It overrides certain of

// the standard type slots, and has to subclass PyType_Type for

// certain functions in the C runtime to work correctly with it.

PyType gcOffsetBase = CreateMetatypeWithGCHandleOffset();

PyType type = AllocateTypeObject("CLRMetatype", metatype: gcOffsetBase);

Util.WriteRef(type, TypeOffset.tp_base, new NewReference(gcOffsetBase).Steal());

nint size = Util.ReadInt32(gcOffsetBase, TypeOffset.tp_basicsize)

+ IntPtr.Size // tp_clr_inst

;

Util.WriteIntPtr(type, TypeOffset.tp_basicsize, size);

Util.WriteInt32(type, ManagedType.Offsets.tp_clr_inst_offset, ManagedType.Offsets.tp_clr_inst);

const TypeFlags flags = TypeFlags.Default

| TypeFlags.HeapType

| TypeFlags.HaveGC

| TypeFlags.HasClrInstance;

Util.WriteCLong(type, TypeOffset.tp_flags, (int)flags);

// Slots will inherit from TypeType, it's not neccesary for setting them.

// Inheried slots:

// tp_basicsize, tp_itemsize,

// tp_dictoffset, tp_weaklistoffset,

// tp_traverse, tp_clear, tp_is_gc, etc.

slotsHolder = SetupMetaSlots(impl, type);

if (Runtime.PyType_Ready(type) != 0)

{

throw PythonException.ThrowLastAsClrException();

}

BorrowedReference dict = Util.ReadRef(type, TypeOffset.tp_dict);

using (var mod = Runtime.PyString_FromString("clr._internal"))

Runtime.PyDict_SetItemString(dict, "__module__", mod.Borrow());

// The type has been modified after PyType_Ready has been called

// Refresh the type

Runtime.PyType_Modified(type);

//DebugUtil.DumpType(type);

return type;

}

internal static SlotsHolder SetupMetaSlots(Type impl, PyType type)

{

// Override type slots with those of the managed implementation.

SlotsHolder slotsHolder = new SlotsHolder(type);

InitializeSlots(type, impl, slotsHolder);

// We need space for 3 PyMethodDef structs.

int mdefSize = (MetaType.CustomMethods.Length + 1) * Marshal.SizeOf(typeof(PyMethodDef));

IntPtr mdef = Runtime.PyMem_Malloc(mdefSize);

IntPtr mdefStart = mdef;

foreach (var methodName in MetaType.CustomMethods)

{

mdef = AddCustomMetaMethod(methodName, type, mdef, slotsHolder);

}

mdef = WriteMethodDefSentinel(mdef);

Debug.Assert((long)(mdefStart + mdefSize) <= (long)mdef);

Util.WriteIntPtr(type, TypeOffset.tp_methods, mdefStart);

// XXX: Hard code with mode check.

if (Runtime.HostedInPython)

{

slotsHolder.Set(TypeOffset.tp_methods, (t, offset) =>

{

var p = Util.ReadIntPtr(t, offset);

Runtime.PyMem_Free(p);

Util.WriteIntPtr(t, offset, IntPtr.Zero);

});

}

return slotsHolder;

}

private static IntPtr AddCustomMetaMethod(string name, PyType type, IntPtr mdef, SlotsHolder slotsHolder)

{

MethodInfo mi = typeof(MetaType).GetMethod(name);

ThunkInfo thunkInfo = Interop.GetThunk(mi);

slotsHolder.KeeapAlive(thunkInfo);

// XXX: Hard code with mode check.

if (Runtime.HostedInPython)

{

IntPtr mdefAddr = mdef;

slotsHolder.AddDealloctor(() =>

{

var tp_dict = Util.ReadRef(type, TypeOffset.tp_dict);

if (Runtime.PyDict_DelItemString(tp_dict, name) != 0)

{

Runtime.PyErr_Print();

Debug.Fail($"Cannot remove {name} from metatype");

}

FreeMethodDef(mdefAddr);

});

}

mdef = WriteMethodDef(mdef, name, thunkInfo.Address);

return mdef;

}

/// <summary>

/// Utility method to allocate a type object & do basic initialization.

/// </summary>

internal static PyType AllocateTypeObject(string name, PyType metatype)

{

var newType = Runtime.PyType_GenericAlloc(metatype, 0);

var type = new PyType(newType.StealOrThrow());

// Clr type would not use __slots__,

// and the PyMemberDef after PyHeapTypeObject will have other uses(e.g. type handle),

// thus set the ob_size to 0 for avoiding slots iterations.

Util.WriteIntPtr(type, TypeOffset.ob_size, IntPtr.Zero);

// Cheat a little: we'll set tp_name to the internal char * of

// the Python version of the type name - otherwise we'd have to

// allocate the tp_name and would have no way to free it.

using var temp = Runtime.PyString_FromString(name);

IntPtr raw = Runtime.PyUnicode_AsUTF8(temp.BorrowOrThrow());

Util.WriteIntPtr(type, TypeOffset.tp_name, raw);

Util.WriteRef(type, TypeOffset.name, new NewReference(temp).Steal());

Util.WriteRef(type, TypeOffset.qualname, temp.Steal());

InheritSubstructs(type.Reference.DangerousGetAddress());

return type;

}

/// <summary>

/// Inherit substructs, that are not inherited by default:

/// https://docs.python.org/3/c-api/typeobj.html#c.PyTypeObject.tp_as_number

/// </summary>

static void InheritSubstructs(IntPtr type)

{

IntPtr substructAddress = type + TypeOffset.nb_add;

Marshal.WriteIntPtr(type, TypeOffset.tp_as_number, substructAddress);

substructAddress = type + TypeOffset.sq_length;

Marshal.WriteIntPtr(type, TypeOffset.tp_as_sequence, substructAddress);

substructAddress = type + TypeOffset.mp_length;

Marshal.WriteIntPtr(type, TypeOffset.tp_as_mapping, substructAddress);

substructAddress = type + TypeOffset.bf_getbuffer;

Marshal.WriteIntPtr(type, TypeOffset.tp_as_buffer, substructAddress);

}

/// <summary>

/// Given a newly allocated Python type object and a managed Type that

/// provides the implementation for the type, connect the type slots of

/// the Python object to the managed methods of the implementing Type.

/// </summary>

internal static void InitializeSlots(PyType type, Type impl, SlotsHolder? slotsHolder = null)

{

// We work from the most-derived class up; make sure to get

// the most-derived slot and not to override it with a base

// class's slot.

var seen = new HashSet<string>();

while (impl != null)

{

MethodInfo[] methods = impl.GetMethods(tbFlags);

foreach (MethodInfo method in methods)

{

string name = method.Name;

if (!name.StartsWith("tp_") && !TypeOffset.IsSupportedSlotName(name))

{

Debug.Assert(!name.Contains("_") || name.StartsWith("_") || method.IsSpecialName);

continue;

}

if (seen.Contains(name))

{

continue;

}

InitializeSlot(type, Interop.GetThunk(method), name, slotsHolder);

seen.Add(name);

}

var initSlot = impl.GetMethod("InitializeSlots", BindingFlags.Static | BindingFlags.Public);

initSlot?.Invoke(null, parameters: new object?[] { type, seen, slotsHolder });

impl = impl.BaseType;

}

SetRequiredSlots(type, seen);

}

private static void SetRequiredSlots(PyType type, HashSet<string> seen)

{

foreach (string slot in _requiredSlots)

{

if (seen.Contains(slot))

{

continue;

}

var offset = TypeOffset.GetSlotOffset(slot);

Util.WriteIntPtr(type, offset, SlotsHolder.GetDefaultSlot(offset));

}

static void InitializeSlot(BorrowedReference type, ThunkInfo thunk, string name, SlotsHolder? slotsHolder)

{

if (!Enum.TryParse<TypeSlotID>(name, out var id))

{

throw new NotSupportedException("Bad slot name " + name);

}

int offset = TypeOffset.GetSlotOffset(name);

InitializeSlot(type, offset, thunk, slotsHolder);

}

static void InitializeSlot(BorrowedReference type, int slotOffset, MethodInfo method, SlotsHolder slotsHolder)

{

var thunk = Interop.GetThunk(method);

InitializeSlot(type, slotOffset, thunk, slotsHolder);

}

internal static void InitializeSlot(BorrowedReference type, int slotOffset, Delegate impl, SlotsHolder slotsHolder)

{

var thunk = Interop.GetThunk(impl);

InitializeSlot(type, slotOffset, thunk, slotsHolder);

}

internal static void InitializeSlotIfEmpty(BorrowedReference type, int slotOffset, Delegate impl, SlotsHolder slotsHolder)

{

if (slotsHolder.IsHolding(slotOffset)) return;

InitializeSlot(type, slotOffset, impl, slotsHolder);

}

static void InitializeSlot(BorrowedReference type, int slotOffset, ThunkInfo thunk, SlotsHolder? slotsHolder)

{

Util.WriteIntPtr(type, slotOffset, thunk.Address);

if (slotsHolder != null)

{

slotsHolder.Set(slotOffset, thunk);

}

/// <summary>

/// Utility method to copy slots from a given type to another type.

/// </summary>

internal static void CopySlot(BorrowedReference from, BorrowedReference to, int offset)

{

IntPtr fp = Util.ReadIntPtr(from, offset);

Util.WriteIntPtr(to, offset, fp);

}

internal static SlotsHolder CreateSlotsHolder(PyType type)

{

var holder = new SlotsHolder(type);

_slotsHolders.Add(type, holder);

return holder;

}

class SlotsHolder

{

public delegate void Resetor(PyType type, int offset);

private Dictionary<int, ThunkInfo> _slots = new Dictionary<int, ThunkInfo>();

private List<ThunkInfo> _keepalive = new List<ThunkInfo>();

private Dictionary<int, Resetor> _customResetors = new Dictionary<int, Resetor>();

private List<Action> _deallocators = new List<Action>();

private bool _alreadyReset = false;

private readonly PyType Type;

public string?[] Holds => _slots.Keys.Select(TypeOffset.GetSlotName).ToArray();

/// <summary>

/// Create slots holder for holding the delegate of slots and be able to reset them.

/// </summary>

/// <param name="type">Steals a reference to target type</param>

public SlotsHolder(PyType type)

{

this.Type = type;

}

public bool IsHolding(int offset) => _slots.ContainsKey(offset);

public ICollection<int> Slots => _slots.Keys;

public void Set(int offset, ThunkInfo thunk)

{

_slots[offset] = thunk;

}

public void Set(int offset, Resetor resetor)

{

_customResetors[offset] = resetor;

}

public void AddDealloctor(Action deallocate)

{

_deallocators.Add(deallocate);

}

public void KeeapAlive(ThunkInfo thunk)

{

_keepalive.Add(thunk);

}

public static void ResetSlots(BorrowedReference type, IEnumerable<int> slots)

{

foreach (int offset in slots)

{

IntPtr ptr = GetDefaultSlot(offset);

#if DEBUG

//DebugUtil.Print($"Set slot<{TypeOffsetHelper.GetSlotNameByOffset(offset)}> to 0x{ptr.ToString("X")} at {typeName}<0x{_type}>");

#endif

Util.WriteIntPtr(type, offset, ptr);

}

public void ResetSlots()

{

if (_alreadyReset)

{

return;

}

_alreadyReset = true;

#if DEBUG

IntPtr tp_name = Util.ReadIntPtr(Type, TypeOffset.tp_name);

string typeName = Marshal.PtrToStringAnsi(tp_name);

#endif

ResetSlots(Type, _slots.Keys);

foreach (var action in _deallocators)

{

action();

}

foreach (var pair in _customResetors)

{

int offset = pair.Key;

var resetor = pair.Value;

resetor?.Invoke(Type, offset);

}

_customResetors.Clear();

_slots.Clear();

_keepalive.Clear();

_deallocators.Clear();

// Custom reset

if (Type != Runtime.CLRMetaType)

{

var metatype = Runtime.PyObject_TYPE(Type);

ManagedType.TryFreeGCHandle(Type, metatype);

}

public static IntPtr GetDefaultSlot(int offset)

{

if (offset == TypeOffset.tp_clear)

{

return TypeManager.subtype_clear;

}

else if (offset == TypeOffset.tp_traverse)

{

return TypeManager.subtype_traverse;

}

else if (offset == TypeOffset.tp_dealloc)

{

// tp_free of PyTypeType is point to PyObejct_GC_Del.

return Util.ReadIntPtr(Runtime.PyTypeType, TypeOffset.tp_free);

}

else if (offset == TypeOffset.tp_free)

{

// PyObject_GC_Del

return Util.ReadIntPtr(Runtime.PyTypeType, TypeOffset.tp_free);

}

else if (offset == TypeOffset.tp_call)

{

return IntPtr.Zero;

}

else if (offset == TypeOffset.tp_new)

{

// PyType_GenericNew

return Util.ReadIntPtr(Runtime.PySuper_Type, TypeOffset.tp_new);

}

else if (offset == TypeOffset.tp_getattro)

{

// PyObject_GenericGetAttr

return Util.ReadIntPtr(Runtime.PyBaseObjectType, TypeOffset.tp_getattro);

}

else if (offset == TypeOffset.tp_setattro)

{

// PyObject_GenericSetAttr

return Util.ReadIntPtr(Runtime.PyBaseObjectType, TypeOffset.tp_setattro);

}

return Util.ReadIntPtr(Runtime.PyTypeType, offset);

}

static class SlotHelper

{

public static NewReference CreateObjectType()

{

using var globals = Runtime.PyDict_New();

if (Runtime.PyDict_SetItemString(globals.Borrow(), "__builtins__", Runtime.PyEval_GetBuiltins()) != 0)

{

globals.Dispose();

throw PythonException.ThrowLastAsClrException();

}

const string code = "class A(object): pass";

using var resRef = Runtime.PyRun_String(code, RunFlagType.File, globals.Borrow(), globals.Borrow());

if (resRef.IsNull())

{

globals.Dispose();

throw PythonException.ThrowLastAsClrException();

}

resRef.Dispose();

BorrowedReference A = Runtime.PyDict_GetItemString(globals.Borrow(), "A");

return new NewReference(A);

}

pythonnet/src/runtime/TypeManager.cs at gitpod · Peter-ouyang/pythonnet · GitHub

Repository navigation

Expand file tree

Breadcrumbs

TypeManager.cs

Latest commit

History

Breadcrumbs

TypeManager.cs

File metadata and controls