cpython/Python/_warnings.c at f320be77ffb73e3b9e7fc98c37b8df3975d84b40 · pythoncapi/cpython

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

901

902

903

904

905

906

907

908

909

910

911

912

913

914

915

916

917

918

919

920

921

922

923

924

925

926

927

928

929

930

931

932

933

934

935

936

937

938

939

940

941

942

943

944

945

946

947

948

949

950

951

952

953

954

955

956

957

958

959

960

961

962

963

964

965

966

967

968

969

970

971

972

973

974

975

976

977

978

979

980

981

982

983

984

985

986

987

988

989

990

991

992

993

994

995

996

997

998

999

1000

#include "Python.h"

#include "internal/pystate.h"

#include "frameobject.h"

#include "clinic/_warnings.c.h"

#define MODULE_NAME "_warnings"

PyDoc_STRVAR(warnings__doc__,

MODULE_NAME " provides basic warning filtering support.\n"

"It is a helper module to speed up interpreter start-up.");

_Py_IDENTIFIER(argv);

_Py_IDENTIFIER(stderr);

#ifndef Py_DEBUG

_Py_IDENTIFIER(default);

_Py_IDENTIFIER(ignore);

#endif

static int

check_matched(PyObject *obj, PyObject *arg)

{

PyObject *result;

_Py_IDENTIFIER(match);

int rc;

/* A 'None' filter always matches */

if (obj == Py_None)

return 1;

/* An internal plain text default filter must match exactly */

if (PyUnicode_CheckExact(obj)) {

int cmp_result = PyUnicode_Compare(obj, arg);

if (cmp_result == -1 && PyErr_Occurred()) {

return -1;

}

return !cmp_result;

}

/* Otherwise assume a regex filter and call its match() method */

result = _PyObject_CallMethodIdObjArgs(obj, &PyId_match, arg, NULL);

if (result == NULL)

return -1;

rc = PyObject_IsTrue(result);

Py_DECREF(result);

return rc;

}

Returns a new reference.

A NULL return value can mean false or an error.

static PyObject *

get_warnings_attr(_Py_Identifier *attr_id, int try_import)

{

PyObject *warnings_str;

PyObject *warnings_module, *obj;

_Py_IDENTIFIER(warnings);

warnings_str = _PyUnicode_FromId(&PyId_warnings);

if (warnings_str == NULL) {

return NULL;

}

/* don't try to import after the start of the Python finallization */

if (try_import && !_Py_IsFinalizing()) {

warnings_module = PyImport_Import(warnings_str);

if (warnings_module == NULL) {

/* Fallback to the C implementation if we cannot get

the Python implementation */

if (PyErr_ExceptionMatches(PyExc_ImportError)) {

PyErr_Clear();

}

return NULL;

}

else {

warnings_module = PyImport_GetModule(warnings_str);

if (warnings_module == NULL)

return NULL;

}

(void)_PyObject_LookupAttrId(warnings_module, attr_id, &obj);

Py_DECREF(warnings_module);

return obj;

}

static PyObject *

get_once_registry(void)

{

PyObject *registry;

_Py_IDENTIFIER(onceregistry);

registry = get_warnings_attr(&PyId_onceregistry, 0);

if (registry == NULL) {

if (PyErr_Occurred())

return NULL;

assert(_PyRuntime.warnings.once_registry);

return _PyRuntime.warnings.once_registry;

}

if (!PyDict_Check(registry)) {

PyErr_Format(PyExc_TypeError,

MODULE_NAME ".onceregistry must be a dict, "

"not '%.200s'",

Py_TYPE(registry)->tp_name);

Py_DECREF(registry);

return NULL;

}

Py_SETREF(_PyRuntime.warnings.once_registry, registry);

return registry;

}

static PyObject *

get_default_action(void)

{

PyObject *default_action;

_Py_IDENTIFIER(defaultaction);

default_action = get_warnings_attr(&PyId_defaultaction, 0);

if (default_action == NULL) {

if (PyErr_Occurred()) {

return NULL;

}

assert(_PyRuntime.warnings.default_action);

return _PyRuntime.warnings.default_action;

}

if (!PyUnicode_Check(default_action)) {

PyErr_Format(PyExc_TypeError,

MODULE_NAME ".defaultaction must be a string, "

"not '%.200s'",

Py_TYPE(default_action)->tp_name);

Py_DECREF(default_action);

return NULL;

}

Py_SETREF(_PyRuntime.warnings.default_action, default_action);

return default_action;

}

/* The item is a new reference. */

static PyObject*

get_filter(PyObject *category, PyObject *text, Py_ssize_t lineno,

PyObject *module, PyObject **item)

{

PyObject *action;

Py_ssize_t i;

PyObject *warnings_filters;

_Py_IDENTIFIER(filters);

warnings_filters = get_warnings_attr(&PyId_filters, 0);

if (warnings_filters == NULL) {

if (PyErr_Occurred())

return NULL;

}

else {

Py_SETREF(_PyRuntime.warnings.filters, warnings_filters);

}

PyObject *filters = _PyRuntime.warnings.filters;

if (filters == NULL || !PyList_Check(filters)) {

PyErr_SetString(PyExc_ValueError,

MODULE_NAME ".filters must be a list");

return NULL;

}

/* _PyRuntime.warnings.filters could change while we are iterating over it. */

for (i = 0; i < PyList_GET_SIZE(filters); i++) {

PyObject *tmp_item, *action, *msg, *cat, *mod, *ln_obj;

Py_ssize_t ln;

int is_subclass, good_msg, good_mod;

tmp_item = PyList_GET_ITEM(filters, i);

if (!PyTuple_Check(tmp_item) || PyTuple_GET_SIZE(tmp_item) != 5) {

PyErr_Format(PyExc_ValueError,

MODULE_NAME ".filters item %zd isn't a 5-tuple", i);

return NULL;

}

/* Python code: action, msg, cat, mod, ln = item */

Py_INCREF(tmp_item);

action = PyTuple_GET_ITEM(tmp_item, 0);

msg = PyTuple_GET_ITEM(tmp_item, 1);

cat = PyTuple_GET_ITEM(tmp_item, 2);

mod = PyTuple_GET_ITEM(tmp_item, 3);

ln_obj = PyTuple_GET_ITEM(tmp_item, 4);

if (!PyUnicode_Check(action)) {

PyErr_Format(PyExc_TypeError,

"action must be a string, not '%.200s'",

Py_TYPE(action)->tp_name);

Py_DECREF(tmp_item);

return NULL;

}

good_msg = check_matched(msg, text);

if (good_msg == -1) {

Py_DECREF(tmp_item);

return NULL;

}

good_mod = check_matched(mod, module);

if (good_mod == -1) {

Py_DECREF(tmp_item);

return NULL;

}

is_subclass = PyObject_IsSubclass(category, cat);

if (is_subclass == -1) {

Py_DECREF(tmp_item);

return NULL;

}

ln = PyLong_AsSsize_t(ln_obj);

if (ln == -1 && PyErr_Occurred()) {

Py_DECREF(tmp_item);

return NULL;

}

if (good_msg && is_subclass && good_mod && (ln == 0 || lineno == ln)) {

*item = tmp_item;

return action;

}

Py_DECREF(tmp_item);

}

action = get_default_action();

if (action != NULL) {

Py_INCREF(Py_None);

*item = Py_None;

return action;

}

return NULL;

}

static int

already_warned(PyObject *registry, PyObject *key, int should_set)

{

PyObject *version_obj, *already_warned;

_Py_IDENTIFIER(version);

if (key == NULL)

return -1;

version_obj = _PyDict_GetItemId(registry, &PyId_version);

if (version_obj == NULL

|| !PyLong_CheckExact(version_obj)

|| PyLong_AsLong(version_obj) != _PyRuntime.warnings.filters_version) {

PyDict_Clear(registry);

version_obj = PyLong_FromLong(_PyRuntime.warnings.filters_version);

if (version_obj == NULL)

return -1;

if (_PyDict_SetItemId(registry, &PyId_version, version_obj) < 0) {

Py_DECREF(version_obj);

return -1;

}

Py_DECREF(version_obj);

}

else {

already_warned = PyDict_GetItem(registry, key);

if (already_warned != NULL) {

int rc = PyObject_IsTrue(already_warned);

if (rc != 0)

return rc;

}

/* This warning wasn't found in the registry, set it. */

if (should_set)

return PyDict_SetItem(registry, key, Py_True);

return 0;

}

/* New reference. */

static PyObject *

normalize_module(PyObject *filename)

{

PyObject *module;

int kind;

void *data;

Py_ssize_t len;

len = PyUnicode_GetLength(filename);

if (len < 0)

return NULL;

if (len == 0)

return PyUnicode_FromString("<unknown>");

kind = PyUnicode_KIND(filename);

data = PyUnicode_DATA(filename);

/* if filename.endswith(".py"): */

if (len >= 3 &&

PyUnicode_READ(kind, data, len-3) == '.' &&

PyUnicode_READ(kind, data, len-2) == 'p' &&

PyUnicode_READ(kind, data, len-1) == 'y')

{

module = PyUnicode_Substring(filename, 0, len-3);

}

else {

module = filename;

Py_INCREF(module);

}

return module;

}

static int

update_registry(PyObject *registry, PyObject *text, PyObject *category,

int add_zero)

{

PyObject *altkey;

int rc;

if (add_zero)

altkey = PyTuple_Pack(3, text, category, _PyLong_Zero);

else

altkey = PyTuple_Pack(2, text, category);

rc = already_warned(registry, altkey, 1);

Py_XDECREF(altkey);

return rc;

}

static void

show_warning(PyObject *filename, int lineno, PyObject *text,

PyObject *category, PyObject *sourceline)

{

PyObject *f_stderr;

PyObject *name;

char lineno_str[128];

_Py_IDENTIFIER(__name__);

PyOS_snprintf(lineno_str, sizeof(lineno_str), ":%d: ", lineno);

name = _PyObject_GetAttrId(category, &PyId___name__);

if (name == NULL) /* XXX Can an object lack a '__name__' attribute? */

goto error;

f_stderr = _PySys_GetObjectId(&PyId_stderr);

if (f_stderr == NULL) {

fprintf(stderr, "lost sys.stderr\n");

goto error;

}

/* Print "filename:lineno: category: text\n" */

if (PyFile_WriteObject(filename, f_stderr, Py_PRINT_RAW) < 0)

goto error;

if (PyFile_WriteString(lineno_str, f_stderr) < 0)

goto error;

if (PyFile_WriteObject(name, f_stderr, Py_PRINT_RAW) < 0)

goto error;

if (PyFile_WriteString(": ", f_stderr) < 0)

goto error;

if (PyFile_WriteObject(text, f_stderr, Py_PRINT_RAW) < 0)

goto error;

if (PyFile_WriteString("\n", f_stderr) < 0)

goto error;

Py_CLEAR(name);

/* Print " source_line\n" */

if (sourceline) {

int kind;

void *data;

Py_ssize_t i, len;

Py_UCS4 ch;

PyObject *truncated;

if (PyUnicode_READY(sourceline) < 1)

goto error;

kind = PyUnicode_KIND(sourceline);

data = PyUnicode_DATA(sourceline);

len = PyUnicode_GET_LENGTH(sourceline);

for (i=0; i<len; i++) {

ch = PyUnicode_READ(kind, data, i);

if (ch != ' ' && ch != '\t' && ch != '\014')

break;

}

truncated = PyUnicode_Substring(sourceline, i, len);

if (truncated == NULL)

goto error;

PyFile_WriteObject(sourceline, f_stderr, Py_PRINT_RAW);

Py_DECREF(truncated);

PyFile_WriteString("\n", f_stderr);

}

else {

_Py_DisplaySourceLine(f_stderr, filename, lineno, 2);

}

error:

Py_XDECREF(name);

PyErr_Clear();

}

static int

call_show_warning(PyObject *category, PyObject *text, PyObject *message,

PyObject *filename, int lineno, PyObject *lineno_obj,

PyObject *sourceline, PyObject *source)

{

PyObject *show_fn, *msg, *res, *warnmsg_cls = NULL;

_Py_IDENTIFIER(_showwarnmsg);

_Py_IDENTIFIER(WarningMessage);

/* If the source parameter is set, try to get the Python implementation.

The Python implementation is able to log the traceback where the source

was allocated, whereas the C implementation doesn't. */

show_fn = get_warnings_attr(&PyId__showwarnmsg, source != NULL);

if (show_fn == NULL) {

if (PyErr_Occurred())

return -1;

show_warning(filename, lineno, text, category, sourceline);

return 0;

}

if (!PyCallable_Check(show_fn)) {

PyErr_SetString(PyExc_TypeError,

"warnings._showwarnmsg() must be set to a callable");

goto error;

}

warnmsg_cls = get_warnings_attr(&PyId_WarningMessage, 0);

if (warnmsg_cls == NULL) {

if (!PyErr_Occurred()) {

PyErr_SetString(PyExc_RuntimeError,

"unable to get warnings.WarningMessage");

}

goto error;

}

msg = PyObject_CallFunctionObjArgs(warnmsg_cls, message, category,

filename, lineno_obj, Py_None, Py_None, source,

NULL);

Py_DECREF(warnmsg_cls);

if (msg == NULL)

goto error;

res = PyObject_CallFunctionObjArgs(show_fn, msg, NULL);

Py_DECREF(show_fn);

Py_DECREF(msg);

if (res == NULL)

return -1;

Py_DECREF(res);

return 0;

error:

Py_XDECREF(show_fn);

return -1;

}

static PyObject *

warn_explicit(PyObject *category, PyObject *message,

PyObject *filename, int lineno,

PyObject *module, PyObject *registry, PyObject *sourceline,

PyObject *source)

{

PyObject *key = NULL, *text = NULL, *result = NULL, *lineno_obj = NULL;

PyObject *item = NULL;

PyObject *action;

int rc;

/* module can be None if a warning is emitted late during Python shutdown.

In this case, the Python warnings module was probably unloaded, filters

are no more available to choose as action. It is safer to ignore the

warning and do nothing. */

if (module == Py_None)

Py_RETURN_NONE;

if (registry && !PyDict_Check(registry) && (registry != Py_None)) {

PyErr_SetString(PyExc_TypeError, "'registry' must be a dict or None");

return NULL;

}

/* Normalize module. */

if (module == NULL) {

module = normalize_module(filename);

if (module == NULL)

return NULL;

}

else

Py_INCREF(module);

/* Normalize message. */

Py_INCREF(message); /* DECREF'ed in cleanup. */

rc = PyObject_IsInstance(message, PyExc_Warning);

if (rc == -1) {

goto cleanup;

}

if (rc == 1) {

text = PyObject_Str(message);

if (text == NULL)

goto cleanup;

category = (PyObject*)message->ob_type;

}

else {

text = message;

message = PyObject_CallFunctionObjArgs(category, message, NULL);

if (message == NULL)

goto cleanup;

}

lineno_obj = PyLong_FromLong(lineno);

if (lineno_obj == NULL)

goto cleanup;

if (source == Py_None) {

source = NULL;

}

/* Create key. */

key = PyTuple_Pack(3, text, category, lineno_obj);

if (key == NULL)

goto cleanup;

if ((registry != NULL) && (registry != Py_None)) {

rc = already_warned(registry, key, 0);

if (rc == -1)

goto cleanup;

else if (rc == 1)

goto return_none;

/* Else this warning hasn't been generated before. */

}

action = get_filter(category, text, lineno, module, &item);

if (action == NULL)

goto cleanup;

if (_PyUnicode_EqualToASCIIString(action, "error")) {

PyErr_SetObject(category, message);

goto cleanup;

}

if (_PyUnicode_EqualToASCIIString(action, "ignore")) {

goto return_none;

}

/* Store in the registry that we've been here, *except* when the action

is "always". */

rc = 0;

if (!_PyUnicode_EqualToASCIIString(action, "always")) {

if (registry != NULL && registry != Py_None &&

PyDict_SetItem(registry, key, Py_True) < 0)

{

goto cleanup;

}

if (_PyUnicode_EqualToASCIIString(action, "once")) {

if (registry == NULL || registry == Py_None) {

registry = get_once_registry();

if (registry == NULL)

goto cleanup;

}

/* _PyRuntime.warnings.once_registry[(text, category)] = 1 */

rc = update_registry(registry, text, category, 0);

}

else if (_PyUnicode_EqualToASCIIString(action, "module")) {

/* registry[(text, category, 0)] = 1 */

if (registry != NULL && registry != Py_None)

rc = update_registry(registry, text, category, 0);

}

else if (!_PyUnicode_EqualToASCIIString(action, "default")) {

PyErr_Format(PyExc_RuntimeError,

"Unrecognized action (%R) in warnings.filters:\n %R",

action, item);

goto cleanup;

}

if (rc == 1) /* Already warned for this module. */

goto return_none;

if (rc == 0) {

if (call_show_warning(category, text, message, filename, lineno,

lineno_obj, sourceline, source) < 0)

goto cleanup;

}

else /* if (rc == -1) */

goto cleanup;

return_none:

result = Py_None;

Py_INCREF(result);

cleanup:

Py_XDECREF(item);

Py_XDECREF(key);

Py_XDECREF(text);

Py_XDECREF(lineno_obj);

Py_DECREF(module);

Py_XDECREF(message);

return result; /* Py_None or NULL. */

}

static int

is_internal_frame(PyFrameObject *frame)

{

static PyObject *importlib_string = NULL;

static PyObject *bootstrap_string = NULL;

PyObject *filename;

int contains;

if (importlib_string == NULL) {

importlib_string = PyUnicode_FromString("importlib");

if (importlib_string == NULL) {

return 0;

}

bootstrap_string = PyUnicode_FromString("_bootstrap");

if (bootstrap_string == NULL) {

Py_DECREF(importlib_string);

return 0;

}

Py_INCREF(importlib_string);

Py_INCREF(bootstrap_string);

}

if (frame == NULL || frame->f_code == NULL ||

frame->f_code->co_filename == NULL) {

return 0;

}

filename = frame->f_code->co_filename;

if (!PyUnicode_Check(filename)) {

return 0;

}

contains = PyUnicode_Contains(filename, importlib_string);

if (contains < 0) {

return 0;

}

else if (contains > 0) {

contains = PyUnicode_Contains(filename, bootstrap_string);

if (contains < 0) {

return 0;

}

else if (contains > 0) {

return 1;

}

return 0;

}

static PyFrameObject *

next_external_frame(PyFrameObject *frame)

{

do {

frame = frame->f_back;

} while (frame != NULL && is_internal_frame(frame));

return frame;

}

/* filename, module, and registry are new refs, globals is borrowed */

/* Returns 0 on error (no new refs), 1 on success */

static int

setup_context(Py_ssize_t stack_level, PyObject **filename, int *lineno,

PyObject **module, PyObject **registry)

{

PyObject *globals;

/* Setup globals and lineno. */

PyFrameObject *f = PyThreadState_GET()->frame;

// Stack level comparisons to Python code is off by one as there is no

// warnings-related stack level to avoid.

if (stack_level <= 0 || is_internal_frame(f)) {

while (--stack_level > 0 && f != NULL) {

f = f->f_back;

}

else {

while (--stack_level > 0 && f != NULL) {

f = next_external_frame(f);

}

if (f == NULL) {

globals = PyThreadState_Get()->interp->sysdict;

*lineno = 1;

}

else {

globals = f->f_globals;

*lineno = PyFrame_GetLineNumber(f);

}

*module = NULL;

/* Setup registry. */

assert(globals != NULL);

assert(PyDict_Check(globals));

*registry = PyDict_GetItemString(globals, "__warningregistry__");

if (*registry == NULL) {

int rc;

*registry = PyDict_New();

if (*registry == NULL)

return 0;

rc = PyDict_SetItemString(globals, "__warningregistry__", *registry);

if (rc < 0)

goto handle_error;

}

else

Py_INCREF(*registry);

/* Setup module. */

*module = PyDict_GetItemString(globals, "__name__");

if (*module == Py_None || (*module != NULL && PyUnicode_Check(*module))) {

Py_INCREF(*module);

}

else {

*module = PyUnicode_FromString("<string>");

if (*module == NULL)

goto handle_error;

}

/* Setup filename. */

*filename = PyDict_GetItemString(globals, "__file__");

if (*filename != NULL && PyUnicode_Check(*filename)) {

Py_ssize_t len;

int kind;

void *data;

if (PyUnicode_READY(*filename))

goto handle_error;

len = PyUnicode_GetLength(*filename);

kind = PyUnicode_KIND(*filename);

data = PyUnicode_DATA(*filename);

#define ascii_lower(c) ((c <= 127) ? Py_TOLOWER(c) : 0)

/* if filename.lower().endswith(".pyc"): */

if (len >= 4 &&

PyUnicode_READ(kind, data, len-4) == '.' &&

ascii_lower(PyUnicode_READ(kind, data, len-3)) == 'p' &&

ascii_lower(PyUnicode_READ(kind, data, len-2)) == 'y' &&

ascii_lower(PyUnicode_READ(kind, data, len-1)) == 'c')

{

*filename = PyUnicode_Substring(*filename, 0,

PyUnicode_GET_LENGTH(*filename)-1);

if (*filename == NULL)

goto handle_error;

}

else

Py_INCREF(*filename);

}

else {

*filename = NULL;

if (*module != Py_None && _PyUnicode_EqualToASCIIString(*module, "__main__")) {

PyObject *argv = _PySys_GetObjectId(&PyId_argv);

/* PyList_Check() is needed because sys.argv is set to None during

Python finalization */

if (argv != NULL && PyList_Check(argv) && PyList_Size(argv) > 0) {

int is_true;

*filename = PyList_GetItem(argv, 0);

Py_INCREF(*filename);

/* If sys.argv[0] is false, then use '__main__'. */

is_true = PyObject_IsTrue(*filename);

if (is_true < 0) {

Py_DECREF(*filename);

goto handle_error;

}

else if (!is_true) {

Py_SETREF(*filename, PyUnicode_FromString("__main__"));

if (*filename == NULL)

goto handle_error;

}

else {

/* embedded interpreters don't have sys.argv, see bug #839151 */

*filename = PyUnicode_FromString("__main__");

if (*filename == NULL)

goto handle_error;

}

if (*filename == NULL) {

*filename = *module;

Py_INCREF(*filename);

}

return 1;

handle_error:

/* filename not XDECREF'ed here as there is no way to jump here with a

dangling reference. */

Py_XDECREF(*registry);

Py_XDECREF(*module);

return 0;

}

static PyObject *

get_category(PyObject *message, PyObject *category)

{

int rc;

/* Get category. */

rc = PyObject_IsInstance(message, PyExc_Warning);

if (rc == -1)

return NULL;

if (rc == 1)

category = (PyObject*)message->ob_type;

else if (category == NULL || category == Py_None)

category = PyExc_UserWarning;

/* Validate category. */

rc = PyObject_IsSubclass(category, PyExc_Warning);

/* category is not a subclass of PyExc_Warning or

PyObject_IsSubclass raised an error */

if (rc == -1 || rc == 0) {

PyErr_Format(PyExc_TypeError,

"category must be a Warning subclass, not '%s'",

Py_TYPE(category)->tp_name);

return NULL;

}

return category;

}

static PyObject *

do_warn(PyObject *message, PyObject *category, Py_ssize_t stack_level,

PyObject *source)

{

PyObject *filename, *module, *registry, *res;

int lineno;

if (!setup_context(stack_level, &filename, &lineno, &module, &registry))

return NULL;

res = warn_explicit(category, message, filename, lineno, module, registry,

NULL, source);

Py_DECREF(filename);

Py_DECREF(registry);

Py_DECREF(module);

return res;

}

/*[clinic input]

warn as warnings_warn

message: object

category: object = None

stacklevel: Py_ssize_t = 1

source: object = None

Issue a warning, or maybe ignore it or raise an exception.

[clinic start generated code]*/

static PyObject *

warnings_warn_impl(PyObject *module, PyObject *message, PyObject *category,

Py_ssize_t stacklevel, PyObject *source)

/*[clinic end generated code: output=31ed5ab7d8d760b2 input=bfdf5cf99f6c4edd]*/

{

category = get_category(message, category);

if (category == NULL)

return NULL;

return do_warn(message, category, stacklevel, source);

}

static PyObject *

get_source_line(PyObject *module_globals, int lineno)

{

_Py_IDENTIFIER(get_source);

_Py_IDENTIFIER(__loader__);

_Py_IDENTIFIER(__name__);

PyObject *loader;

PyObject *module_name;

PyObject *get_source;

PyObject *source;

PyObject *source_list;

PyObject *source_line;

/* Check/get the requisite pieces needed for the loader. */

loader = _PyDict_GetItemIdWithError(module_globals, &PyId___loader__);

if (loader == NULL) {

return NULL;

}

Py_INCREF(loader);

module_name = _PyDict_GetItemIdWithError(module_globals, &PyId___name__);

if (!module_name) {

Py_DECREF(loader);

return NULL;

}

Py_INCREF(module_name);

/* Make sure the loader implements the optional get_source() method. */

(void)_PyObject_LookupAttrId(loader, &PyId_get_source, &get_source);

Py_DECREF(loader);

if (!get_source) {

Py_DECREF(module_name);

return NULL;

}

/* Call get_source() to get the source code. */

source = PyObject_CallFunctionObjArgs(get_source, module_name, NULL);

Py_DECREF(get_source);

Py_DECREF(module_name);

if (!source) {

return NULL;

}

if (source == Py_None) {

Py_DECREF(source);

return NULL;

}

/* Split the source into lines. */

source_list = PyUnicode_Splitlines(source, 0);

Py_DECREF(source);

if (!source_list) {

return NULL;

}

/* Get the source line. */

source_line = PyList_GetItem(source_list, lineno-1);

Py_XINCREF(source_line);

Py_DECREF(source_list);

return source_line;

}

static PyObject *

warnings_warn_explicit(PyObject *self, PyObject *args, PyObject *kwds)

{

static char *kwd_list[] = {"message", "category", "filename", "lineno",

"module", "registry", "module_globals",

"source", 0};

PyObject *message;

PyObject *category;

PyObject *filename;

int lineno;

PyObject *module = NULL;

PyObject *registry = NULL;

PyObject *module_globals = NULL;

PyObject *sourceobj = NULL;

PyObject *source_line = NULL;

PyObject *returned;

if (!PyArg_ParseTupleAndKeywords(args, kwds, "OOUi|OOOO:warn_explicit",

kwd_list, &message, &category, &filename, &lineno, &module,

&registry, &module_globals, &sourceobj))

return NULL;

if (module_globals) {

source_line = get_source_line(module_globals, lineno);

if (source_line == NULL && PyErr_Occurred()) {

return NULL;

}

returned = warn_explicit(category, message, filename, lineno, module,

registry, source_line, sourceobj);

Py_XDECREF(source_line);

return returned;

}

static PyObject *

warnings_filters_mutated(PyObject *self, PyObject *args)

{

_PyRuntime.warnings.filters_version++;

Py_RETURN_NONE;

}

/* Function to issue a warning message; may raise an exception. */

static int

warn_unicode(PyObject *category, PyObject *message,

Py_ssize_t stack_level, PyObject *source)

{

PyObject *res;

if (category == NULL)

category = PyExc_RuntimeWarning;

res = do_warn(message, category, stack_level, source);

if (res == NULL)

return -1;

Py_DECREF(res);

return 0;

}

static int

_PyErr_WarnFormatV(PyObject *source,

PyObject *category, Py_ssize_t stack_level,

const char *format, va_list vargs)

{

PyObject *message;

int res;

message = PyUnicode_FromFormatV(format, vargs);

if (message == NULL)

return -1;

res = warn_unicode(category, message, stack_level, source);

Py_DECREF(message);

return res;

View remainder of file in raw view

FilesExpand file tree

_warnings.c

Latest commit

History

_warnings.c

File metadata and controls