cpython/Python/pythonrun.c at eefa1ad9118d23739467eefbfbfad86f854d8efd · python/cpython · GitHub

History

2011 lines (1784 loc) · 52.6 KB

Raw

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

/* Top level execution of Python code (including in __main__) */

/* To help control the interfaces between the startup, execution and

* shutdown code, the phases are split across separate modules (bootstrap,

* pythonrun, shutdown)

/* TODO: Cull includes following phase split */

#include <stdbool.h>

#include "Python.h"

#include "pycore_ast.h" // PyAST_mod2obj

#include "pycore_ceval.h" // _Py_EnterRecursiveCall

#include "pycore_compile.h" // _PyAST_Compile()

#include "pycore_interp.h" // PyInterpreterState.importlib

#include "pycore_object.h" // _PyDebug_PrintTotalRefs()

#include "pycore_parser.h" // _PyParser_ASTFromString()

#include "pycore_pyerrors.h" // _PyErr_Fetch, _Py_Offer_Suggestions

#include "pycore_pylifecycle.h" // _Py_UnhandledKeyboardInterrupt

#include "pycore_pystate.h" // _PyInterpreterState_GET()

#include "pycore_sysmodule.h" // _PySys_Audit()

#include "pycore_traceback.h" // _PyTraceBack_Print_Indented()

#include "errcode.h" // E_EOF

#include "marshal.h" // PyMarshal_ReadLongFromFile()

#ifdef MS_WINDOWS

# include "malloc.h" // alloca()

#endif

#ifdef MS_WINDOWS

# undef BYTE

# include "windows.h"

#endif

#ifdef __cplusplus

extern "C" {

#endif

/* Forward */

static void flush_io(void);

static PyObject *run_mod(mod_ty, PyObject *, PyObject *, PyObject *,

PyCompilerFlags *, PyArena *);

static PyObject *run_pyc_file(FILE *, PyObject *, PyObject *,

PyCompilerFlags *);

static int PyRun_InteractiveOneObjectEx(FILE *, PyObject *, PyCompilerFlags *);

static PyObject* pyrun_file(FILE *fp, PyObject *filename, int start,

PyObject *globals, PyObject *locals, int closeit,

PyCompilerFlags *flags);

int

_PyRun_AnyFileObject(FILE *fp, PyObject *filename, int closeit,

PyCompilerFlags *flags)

{

int decref_filename = 0;

if (filename == NULL) {

filename = PyUnicode_FromString("???");

if (filename == NULL) {

PyErr_Print();

return -1;

}

decref_filename = 1;

}

int res;

if (_Py_FdIsInteractive(fp, filename)) {

res = _PyRun_InteractiveLoopObject(fp, filename, flags);

if (closeit) {

fclose(fp);

}

else {

res = _PyRun_SimpleFileObject(fp, filename, closeit, flags);

}

if (decref_filename) {

Py_DECREF(filename);

}

return res;

}

/* Parse input from a file and execute it */

int

PyRun_AnyFileExFlags(FILE *fp, const char *filename, int closeit,

PyCompilerFlags *flags)

{

PyObject *filename_obj;

if (filename != NULL) {

filename_obj = PyUnicode_DecodeFSDefault(filename);

if (filename_obj == NULL) {

PyErr_Print();

return -1;

}

else {

filename_obj = NULL;

}

int res = _PyRun_AnyFileObject(fp, filename_obj, closeit, flags);

Py_XDECREF(filename_obj);

return res;

}

int

_PyRun_InteractiveLoopObject(FILE *fp, PyObject *filename, PyCompilerFlags *flags)

{

PyCompilerFlags local_flags = _PyCompilerFlags_INIT;

if (flags == NULL) {

flags = &local_flags;

}

PyThreadState *tstate = _PyThreadState_GET();

PyObject *v = _PySys_GetAttr(tstate, &_Py_ID(ps1));

if (v == NULL) {

_PySys_SetAttr(&_Py_ID(ps1), v = PyUnicode_FromString(">>> "));

Py_XDECREF(v);

}

v = _PySys_GetAttr(tstate, &_Py_ID(ps2));

if (v == NULL) {

_PySys_SetAttr(&_Py_ID(ps2), v = PyUnicode_FromString("... "));

Py_XDECREF(v);

}

#ifdef Py_REF_DEBUG

int show_ref_count = _Py_GetConfig()->show_ref_count;

#endif

int err = 0;

int ret;

int nomem_count = 0;

do {

ret = PyRun_InteractiveOneObjectEx(fp, filename, flags);

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

/* Prevent an endless loop after multiple consecutive MemoryErrors

* while still allowing an interactive command to fail with a

* MemoryError. */

if (PyErr_ExceptionMatches(PyExc_MemoryError)) {

if (++nomem_count > 16) {

PyErr_Clear();

err = -1;

break;

}

} else {

nomem_count = 0;

}

PyErr_Print();

flush_io();

} else {

nomem_count = 0;

}

#ifdef Py_REF_DEBUG

if (show_ref_count) {

_PyDebug_PrintTotalRefs();

}

#endif

} while (ret != E_EOF);

return err;

}

int

PyRun_InteractiveLoopFlags(FILE *fp, const char *filename, PyCompilerFlags *flags)

{

PyObject *filename_obj = PyUnicode_DecodeFSDefault(filename);

if (filename_obj == NULL) {

PyErr_Print();

return -1;

}

int err = _PyRun_InteractiveLoopObject(fp, filename_obj, flags);

Py_DECREF(filename_obj);

return err;

}

/* A PyRun_InteractiveOneObject() auxiliary function that does not print the

* error on failure. */

static int

PyRun_InteractiveOneObjectEx(FILE *fp, PyObject *filename,

PyCompilerFlags *flags)

{

PyObject *m, *d, *v, *w, *oenc = NULL;

mod_ty mod;

PyArena *arena;

const char *ps1 = "", *ps2 = "", *enc = NULL;

int errcode = 0;

PyThreadState *tstate = _PyThreadState_GET();

if (fp == stdin) {

/* Fetch encoding from sys.stdin if possible. */

v = _PySys_GetAttr(tstate, &_Py_ID(stdin));

if (v && v != Py_None) {

oenc = PyObject_GetAttr(v, &_Py_ID(encoding));

if (oenc)

enc = PyUnicode_AsUTF8(oenc);

if (!enc)

PyErr_Clear();

}

v = _PySys_GetAttr(tstate, &_Py_ID(ps1));

if (v != NULL) {

v = PyObject_Str(v);

if (v == NULL)

PyErr_Clear();

else if (PyUnicode_Check(v)) {

ps1 = PyUnicode_AsUTF8(v);

if (ps1 == NULL) {

PyErr_Clear();

ps1 = "";

}

w = _PySys_GetAttr(tstate, &_Py_ID(ps2));

if (w != NULL) {

w = PyObject_Str(w);

if (w == NULL)

PyErr_Clear();

else if (PyUnicode_Check(w)) {

ps2 = PyUnicode_AsUTF8(w);

if (ps2 == NULL) {

PyErr_Clear();

ps2 = "";

}

arena = _PyArena_New();

if (arena == NULL) {

Py_XDECREF(v);

Py_XDECREF(w);

Py_XDECREF(oenc);

return -1;

}

mod = _PyParser_ASTFromFile(fp, filename, enc, Py_single_input,

ps1, ps2, flags, &errcode, arena);

Py_XDECREF(v);

Py_XDECREF(w);

Py_XDECREF(oenc);

if (mod == NULL) {

_PyArena_Free(arena);

if (errcode == E_EOF) {

PyErr_Clear();

return E_EOF;

}

return -1;

}

m = PyImport_AddModuleObject(&_Py_ID(__main__));

if (m == NULL) {

_PyArena_Free(arena);

return -1;

}

d = PyModule_GetDict(m);

v = run_mod(mod, filename, d, d, flags, arena);

_PyArena_Free(arena);

if (v == NULL) {

return -1;

}

Py_DECREF(v);

flush_io();

return 0;

}

int

PyRun_InteractiveOneObject(FILE *fp, PyObject *filename, PyCompilerFlags *flags)

{

int res;

res = PyRun_InteractiveOneObjectEx(fp, filename, flags);

if (res == -1) {

PyErr_Print();

flush_io();

}

return res;

}

int

PyRun_InteractiveOneFlags(FILE *fp, const char *filename_str, PyCompilerFlags *flags)

{

PyObject *filename;

int res;

filename = PyUnicode_DecodeFSDefault(filename_str);

if (filename == NULL) {

PyErr_Print();

return -1;

}

res = PyRun_InteractiveOneObject(fp, filename, flags);

Py_DECREF(filename);

return res;

}

/* Check whether a file maybe a pyc file: Look at the extension,

the file type, and, if we may close it, at the first few bytes. */

static int

maybe_pyc_file(FILE *fp, PyObject *filename, int closeit)

{

PyObject *ext = PyUnicode_FromString(".pyc");

if (ext == NULL) {

return -1;

}

Py_ssize_t endswith = PyUnicode_Tailmatch(filename, ext, 0, PY_SSIZE_T_MAX, +1);

Py_DECREF(ext);

if (endswith) {

return 1;

}

/* Only look into the file if we are allowed to close it, since

it then should also be seekable. */

if (!closeit) {

return 0;

}

/* Read only two bytes of the magic. If the file was opened in

text mode, the bytes 3 and 4 of the magic (\r\n) might not

be read as they are on disk. */

unsigned int halfmagic = PyImport_GetMagicNumber() & 0xFFFF;

unsigned char buf[2];

/* Mess: In case of -x, the stream is NOT at its start now,

and ungetc() was used to push back the first newline,

which makes the current stream position formally undefined,

and a x-platform nightmare.

Unfortunately, we have no direct way to know whether -x

was specified. So we use a terrible hack: if the current

stream position is not 0, we assume -x was specified, and

give up. Bug 132850 on SourceForge spells out the

hopelessness of trying anything else (fseek and ftell

don't work predictably x-platform for text-mode files).

int ispyc = 0;

if (ftell(fp) == 0) {

if (fread(buf, 1, 2, fp) == 2 &&

((unsigned int)buf[1]<<8 | buf[0]) == halfmagic)

ispyc = 1;

rewind(fp);

}

return ispyc;

}

static int

set_main_loader(PyObject *d, PyObject *filename, const char *loader_name)

{

PyInterpreterState *interp = _PyInterpreterState_GET();

PyObject *bootstrap = PyObject_GetAttrString(interp->importlib,

"_bootstrap_external");

if (bootstrap == NULL) {

return -1;

}

PyObject *loader_type = PyObject_GetAttrString(bootstrap, loader_name);

Py_DECREF(bootstrap);

if (loader_type == NULL) {

return -1;

}

PyObject *loader = PyObject_CallFunction(loader_type,

"sO", "__main__", filename);

Py_DECREF(loader_type);

if (loader == NULL) {

return -1;

}

if (PyDict_SetItemString(d, "__loader__", loader) < 0) {

Py_DECREF(loader);

return -1;

}

Py_DECREF(loader);

return 0;

}

int

_PyRun_SimpleFileObject(FILE *fp, PyObject *filename, int closeit,

PyCompilerFlags *flags)

{

PyObject *m, *d, *v;

int set_file_name = 0, ret = -1;

m = PyImport_AddModule("__main__");

if (m == NULL)

return -1;

Py_INCREF(m);

d = PyModule_GetDict(m);

if (_PyDict_GetItemStringWithError(d, "__file__") == NULL) {

if (PyErr_Occurred()) {

goto done;

}

if (PyDict_SetItemString(d, "__file__", filename) < 0) {

goto done;

}

if (PyDict_SetItemString(d, "__cached__", Py_None) < 0) {

goto done;

}

set_file_name = 1;

}

int pyc = maybe_pyc_file(fp, filename, closeit);

if (pyc < 0) {

goto done;

}

if (pyc) {

FILE *pyc_fp;

/* Try to run a pyc file. First, re-open in binary */

if (closeit) {

fclose(fp);

}

pyc_fp = _Py_fopen_obj(filename, "rb");

if (pyc_fp == NULL) {

fprintf(stderr, "python: Can't reopen .pyc file\n");

goto done;

}

if (set_main_loader(d, filename, "SourcelessFileLoader") < 0) {

fprintf(stderr, "python: failed to set __main__.__loader__\n");

ret = -1;

fclose(pyc_fp);

goto done;

}

v = run_pyc_file(pyc_fp, d, d, flags);

} else {

/* When running from stdin, leave __main__.__loader__ alone */

if (PyUnicode_CompareWithASCIIString(filename, "<stdin>") != 0 &&

set_main_loader(d, filename, "SourceFileLoader") < 0) {

fprintf(stderr, "python: failed to set __main__.__loader__\n");

ret = -1;

goto done;

}

v = pyrun_file(fp, filename, Py_file_input, d, d,

closeit, flags);

}

flush_io();

if (v == NULL) {

Py_CLEAR(m);

PyErr_Print();

goto done;

}

Py_DECREF(v);

ret = 0;

done:

if (set_file_name) {

if (PyDict_DelItemString(d, "__file__")) {

PyErr_Clear();

}

if (PyDict_DelItemString(d, "__cached__")) {

PyErr_Clear();

}

Py_XDECREF(m);

return ret;

}

int

PyRun_SimpleFileExFlags(FILE *fp, const char *filename, int closeit,

PyCompilerFlags *flags)

{

PyObject *filename_obj = PyUnicode_DecodeFSDefault(filename);

if (filename_obj == NULL) {

return -1;

}

int res = _PyRun_SimpleFileObject(fp, filename_obj, closeit, flags);

Py_DECREF(filename_obj);

return res;

}

int

PyRun_SimpleStringFlags(const char *command, PyCompilerFlags *flags)

{

PyObject *m, *d, *v;

m = PyImport_AddModule("__main__");

if (m == NULL)

return -1;

d = PyModule_GetDict(m);

v = PyRun_StringFlags(command, Py_file_input, d, d, flags);

if (v == NULL) {

PyErr_Print();

return -1;

}

Py_DECREF(v);

return 0;

}

static int

parse_syntax_error(PyObject *err, PyObject **message, PyObject **filename,

Py_ssize_t *lineno, Py_ssize_t *offset,

Py_ssize_t* end_lineno, Py_ssize_t* end_offset,

PyObject **text)

{

Py_ssize_t hold;

PyObject *v;

*message = NULL;

*filename = NULL;

/* new style errors. `err' is an instance */

*message = PyObject_GetAttr(err, &_Py_ID(msg));

if (!*message)

goto finally;

v = PyObject_GetAttr(err, &_Py_ID(filename));

if (!v)

goto finally;

if (v == Py_None) {

Py_DECREF(v);

_Py_DECLARE_STR(anon_string, "<string>");

*filename = &_Py_STR(anon_string);

Py_INCREF(*filename);

}

else {

*filename = v;

}

v = PyObject_GetAttr(err, &_Py_ID(lineno));

if (!v)

goto finally;

hold = PyLong_AsSsize_t(v);

Py_DECREF(v);

if (hold < 0 && PyErr_Occurred())

goto finally;

*lineno = hold;

v = PyObject_GetAttr(err, &_Py_ID(offset));

if (!v)

goto finally;

if (v == Py_None) {

*offset = -1;

Py_DECREF(v);

} else {

hold = PyLong_AsSsize_t(v);

Py_DECREF(v);

if (hold < 0 && PyErr_Occurred())

goto finally;

*offset = hold;

}

if (Py_TYPE(err) == (PyTypeObject*)PyExc_SyntaxError) {

v = PyObject_GetAttr(err, &_Py_ID(end_lineno));

if (!v) {

PyErr_Clear();

*end_lineno = *lineno;

}

else if (v == Py_None) {

*end_lineno = *lineno;

Py_DECREF(v);

} else {

hold = PyLong_AsSsize_t(v);

Py_DECREF(v);

if (hold < 0 && PyErr_Occurred())

goto finally;

*end_lineno = hold;

}

v = PyObject_GetAttr(err, &_Py_ID(end_offset));

if (!v) {

PyErr_Clear();

*end_offset = -1;

}

else if (v == Py_None) {

*end_offset = -1;

Py_DECREF(v);

} else {

hold = PyLong_AsSsize_t(v);

Py_DECREF(v);

if (hold < 0 && PyErr_Occurred())

goto finally;

*end_offset = hold;

}

} else {

// SyntaxError subclasses

*end_lineno = *lineno;

*end_offset = -1;

}

v = PyObject_GetAttr(err, &_Py_ID(text));

if (!v)

goto finally;

if (v == Py_None) {

Py_DECREF(v);

*text = NULL;

}

else {

*text = v;

}

return 1;

finally:

Py_XDECREF(*message);

Py_XDECREF(*filename);

return 0;

}

static int

print_error_text(PyObject *f, Py_ssize_t offset, Py_ssize_t end_offset,

PyObject *text_obj)

{

size_t caret_repetitions = (end_offset > 0 && end_offset > offset) ?

end_offset - offset : 1;

/* Convert text to a char pointer; return if error */

const char *text = PyUnicode_AsUTF8(text_obj);

if (text == NULL) {

return -1;

}

/* Convert offset from 1-based to 0-based */

offset--;

/* Strip leading whitespace from text, adjusting offset as we go */

while (*text == ' ' || *text == '\t' || *text == '\f') {

text++;

offset--;

}

/* Calculate text length excluding trailing newline */

Py_ssize_t len = strlen(text);

if (len > 0 && text[len-1] == '\n') {

len--;

}

/* Clip offset to at most len */

if (offset > len) {

offset = len;

}

/* Skip past newlines embedded in text */

for (;;) {

const char *nl = strchr(text, '\n');

if (nl == NULL) {

break;

}

Py_ssize_t inl = nl - text;

if (inl >= offset) {

break;

}

inl += 1;

text += inl;

len -= inl;

offset -= (int)inl;

}

/* Print text */

if (PyFile_WriteString(" ", f) < 0) {

return -1;

}

if (PyFile_WriteString(text, f) < 0) {

return -1;

}

/* Make sure there's a newline at the end */

if (text[len] != '\n') {

if (PyFile_WriteString("\n", f) < 0) {

return -1;

}

/* Don't print caret if it points to the left of the text */

if (offset < 0) {

return 0;

}

/* Write caret line */

if (PyFile_WriteString(" ", f) < 0) {

return -1;

}

while (--offset >= 0) {

if (PyFile_WriteString(" ", f) < 0) {

return -1;

}

for (size_t caret_iter=0; caret_iter < caret_repetitions ; caret_iter++) {

if (PyFile_WriteString("^", f) < 0) {

return -1;

}

if (PyFile_WriteString("\n", f) < 0) {

return -1;

}

return 0;

}

int

_Py_HandleSystemExit(int *exitcode_p)

{

int inspect = _Py_GetConfig()->inspect;

if (inspect) {

/* Don't exit if -i flag was given. This flag is set to 0

* when entering interactive mode for inspecting. */

return 0;

}

if (!PyErr_ExceptionMatches(PyExc_SystemExit)) {

return 0;

}

PyObject *exception, *value, *tb;

PyErr_Fetch(&exception, &value, &tb);

fflush(stdout);

int exitcode = 0;

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

goto done;

}

if (PyExceptionInstance_Check(value)) {

/* The error code should be in the `code' attribute. */

PyObject *code = PyObject_GetAttr(value, &_Py_ID(code));

if (code) {

Py_DECREF(value);

value = code;

if (value == Py_None)

goto done;

}

/* If we failed to dig out the 'code' attribute,

just let the else clause below print the error. */

}

if (PyLong_Check(value)) {

exitcode = (int)PyLong_AsLong(value);

}

else {

PyThreadState *tstate = _PyThreadState_GET();

PyObject *sys_stderr = _PySys_GetAttr(tstate, &_Py_ID(stderr));

/* We clear the exception here to avoid triggering the assertion

* in PyObject_Str that ensures it won't silently lose exception

* details.

PyErr_Clear();

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

PyFile_WriteObject(value, sys_stderr, Py_PRINT_RAW);

} else {

PyObject_Print(value, stderr, Py_PRINT_RAW);

fflush(stderr);

}

PySys_WriteStderr("\n");

exitcode = 1;

}

done:

/* Restore and clear the exception info, in order to properly decref

* the exception, value, and traceback. If we just exit instead,

* these leak, which confuses PYTHONDUMPREFS output, and may prevent

* some finalizers from running.

PyErr_Restore(exception, value, tb);

PyErr_Clear();

*exitcode_p = exitcode;

return 1;

}

static void

handle_system_exit(void)

{

int exitcode;

if (_Py_HandleSystemExit(&exitcode)) {

Py_Exit(exitcode);

}

static void

_PyErr_PrintEx(PyThreadState *tstate, int set_sys_last_vars)

{

PyObject *exception, *v, *tb, *hook;

handle_system_exit();

_PyErr_Fetch(tstate, &exception, &v, &tb);

if (exception == NULL) {

goto done;

}

_PyErr_NormalizeException(tstate, &exception, &v, &tb);

if (tb == NULL) {

tb = Py_None;

Py_INCREF(tb);

}

PyException_SetTraceback(v, tb);

if (exception == NULL) {

goto done;

}

/* Now we know v != NULL too */

if (set_sys_last_vars) {

if (_PySys_SetAttr(&_Py_ID(last_type), exception) < 0) {

_PyErr_Clear(tstate);

}

if (_PySys_SetAttr(&_Py_ID(last_value), v) < 0) {

_PyErr_Clear(tstate);

}

if (_PySys_SetAttr(&_Py_ID(last_traceback), tb) < 0) {

_PyErr_Clear(tstate);

}

hook = _PySys_GetAttr(tstate, &_Py_ID(excepthook));

if (_PySys_Audit(tstate, "sys.excepthook", "OOOO", hook ? hook : Py_None,

exception, v, tb) < 0) {

if (PyErr_ExceptionMatches(PyExc_RuntimeError)) {

PyErr_Clear();

goto done;

}

_PyErr_WriteUnraisableMsg("in audit hook", NULL);

}

if (hook) {

PyObject* stack[3];

PyObject *result;

stack[0] = exception;

stack[1] = v;

stack[2] = tb;

result = _PyObject_FastCall(hook, stack, 3);

if (result == NULL) {

handle_system_exit();

PyObject *exception2, *v2, *tb2;

_PyErr_Fetch(tstate, &exception2, &v2, &tb2);

_PyErr_NormalizeException(tstate, &exception2, &v2, &tb2);

/* It should not be possible for exception2 or v2

to be NULL. However PyErr_Display() can't

tolerate NULLs, so just be safe. */

if (exception2 == NULL) {

exception2 = Py_None;

Py_INCREF(exception2);

}

if (v2 == NULL) {

v2 = Py_None;

Py_INCREF(v2);

}

fflush(stdout);

PySys_WriteStderr("Error in sys.excepthook:\n");

PyErr_Display(exception2, v2, tb2);

PySys_WriteStderr("\nOriginal exception was:\n");

PyErr_Display(exception, v, tb);

Py_DECREF(exception2);

Py_DECREF(v2);

Py_XDECREF(tb2);

}

Py_XDECREF(result);

}

else {

PySys_WriteStderr("sys.excepthook is missing\n");

PyErr_Display(exception, v, tb);

}

done:

Py_XDECREF(exception);

Py_XDECREF(v);

Py_XDECREF(tb);

}

void

_PyErr_Print(PyThreadState *tstate)

{

_PyErr_PrintEx(tstate, 1);

}

void

PyErr_PrintEx(int set_sys_last_vars)

{

PyThreadState *tstate = _PyThreadState_GET();

_PyErr_PrintEx(tstate, set_sys_last_vars);

}

void

PyErr_Print(void)

{

PyErr_PrintEx(1);

}

struct exception_print_context

{

PyObject *file;

PyObject *seen; // Prevent cycles in recursion

int exception_group_depth; // nesting level of current exception group

bool need_close; // Need a closing bottom frame

int max_group_width; // Maximum number of children of each EG

int max_group_depth; // Maximum nesting level of EGs

};

#define EXC_MARGIN(ctx) ((ctx)->exception_group_depth ? "| " : "")

#define EXC_INDENT(ctx) (2 * (ctx)->exception_group_depth)

static int

write_indented_margin(struct exception_print_context *ctx, PyObject *f)

{

return _Py_WriteIndentedMargin(EXC_INDENT(ctx), EXC_MARGIN(ctx), f);

}

static int

print_exception_invalid_type(struct exception_print_context *ctx,

PyObject *value)

{

PyObject *f = ctx->file;

if (_Py_WriteIndent(EXC_INDENT(ctx), f) < 0) {

return -1;

}

const char *const msg = "TypeError: print_exception(): Exception expected "

"for value, ";

if (PyFile_WriteString(msg, f) < 0) {

return -1;

}

if (PyFile_WriteString(Py_TYPE(value)->tp_name, f) < 0) {

return -1;

}

if (PyFile_WriteString(" found\n", f) < 0) {

return -1;

}

return 0;

}

static int

print_exception_traceback(struct exception_print_context *ctx, PyObject *value)

{

PyObject *f = ctx->file;

int err = 0;

PyObject *tb = PyException_GetTraceback(value);

if (tb && tb != Py_None) {

const char *header = EXCEPTION_TB_HEADER;

const char *header_margin = EXC_MARGIN(ctx);

if (_PyBaseExceptionGroup_Check(value)) {

header = EXCEPTION_GROUP_TB_HEADER;

if (ctx->exception_group_depth == 1) {

header_margin = "+ ";

}

err = _PyTraceBack_Print_Indented(

tb, EXC_INDENT(ctx), EXC_MARGIN(ctx), header_margin, header, f);

}

Py_XDECREF(tb);

return err;

}

static int

print_exception_file_and_line(struct exception_print_context *ctx,

PyObject **value_p)

{

PyObject *f = ctx->file;

PyObject *tmp;

int res = _PyObject_LookupAttr(*value_p, &_Py_ID(print_file_and_line), &tmp);

if (res <= 0) {

if (res < 0) {

PyErr_Clear();

}

return 0;

}

Py_DECREF(tmp);

PyObject *message, *filename, *text;

Py_ssize_t lineno, offset, end_lineno, end_offset;

if (!parse_syntax_error(*value_p, &message, &filename,

&lineno, &offset,

&end_lineno, &end_offset, &text)) {

PyErr_Clear();

return 0;

}

Py_SETREF(*value_p, message);

PyObject *line = PyUnicode_FromFormat(" File \"%S\", line %zd\n",

filename, lineno);

Py_DECREF(filename);

if (line == NULL) {

goto error;

}

if (write_indented_margin(ctx, f) < 0) {

goto error;

}

if (PyFile_WriteObject(line, f, Py_PRINT_RAW) < 0) {

goto error;

}

Py_CLEAR(line);

if (text != NULL) {

Py_ssize_t line_size;

const char *error_line = PyUnicode_AsUTF8AndSize(text, &line_size);

// If the location of the error spawn multiple lines, we want

// to just print the first one and highlight everything until

// the end of that one since we don't support multi-line error

// messages.

if (end_lineno > lineno) {

end_offset = (error_line != NULL) ? line_size : -1;

}

// Limit the amount of '^' that we can display to

// the size of the text in the source line.

View remainder of file in raw view

cpython/Python/pythonrun.c at eefa1ad9118d23739467eefbfbfad86f854d8efd · python/cpython · GitHub

Uh oh!

Uh oh!

cpython/Python/pythonrun.c at eefa1ad9118d23739467eefbfbfad86f854d8efd · python/cpython · GitHub

Uh oh!

Uh oh!

Expand file tree

Breadcrumbs

pythonrun.c

Latest commit

History

Breadcrumbs

pythonrun.c

File metadata and controls