Viewing: github-redirect.dependabot.com

Repository navigation

More items

Blame

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

/* Support for dynamic loading of extension modules */

#include "Python.h"

#include "pycore_call.h" // _PyObject_CallMethod()

#include "pycore_import.h" // _PyImport_SwapPackageContext()

#include "pycore_importdl.h"

#include "pycore_moduleobject.h" // _PyModule_GetDefOrNull()

#include "pycore_pyerrors.h" // _PyErr_FormatFromCause()

#include "pycore_runtime.h" // _Py_ID()

/***********************************/

/* module info to use when loading */

/***********************************/

static const struct hook_prefixes ascii_only_prefixes = {

"PyInit", "PyModExport"};

static const struct hook_prefixes nonascii_prefixes = {

"PyInitU", "PyModExportU"};

/* Get the variable part of a module's export symbol name.

* Returns a bytes instance. For non-ASCII-named modules, the name is

* encoded as per PEP 489.

* The hook_prefix pointer is set to either ascii_only_prefix or

* nonascii_prefix, as appropriate.

static PyObject *

get_encoded_name(PyObject *name, const struct hook_prefixes **hook_prefixes) {

PyObject *tmp;

PyObject *encoded = NULL;

PyObject *modname = NULL;

Py_ssize_t name_len, lastdot;

/* Get the short name (substring after last dot) */

name_len = PyUnicode_GetLength(name);

if (name_len < 0) {

return NULL;

}

lastdot = PyUnicode_FindChar(name, '.', 0, name_len, -1);

if (lastdot < -1) {

return NULL;

} else if (lastdot >= 0) {

tmp = PyUnicode_Substring(name, lastdot + 1, name_len);

if (tmp == NULL)

return NULL;

name = tmp;

/* "name" now holds a new reference to the substring */

} else {

Py_INCREF(name);

}

/* Encode to ASCII or Punycode, as needed */

encoded = PyUnicode_AsEncodedString(name, "ascii", NULL);

if (encoded != NULL) {

*hook_prefixes = &ascii_only_prefixes;

} else {

if (PyErr_ExceptionMatches(PyExc_UnicodeEncodeError)) {

PyErr_Clear();

encoded = PyUnicode_AsEncodedString(name, "punycode", NULL);

if (encoded == NULL) {

goto error;

}

*hook_prefixes = &nonascii_prefixes;

} else {

goto error;

}

/* Replace '-' by '_' */

modname = _PyObject_CallMethod(encoded, &_Py_ID(replace), "cc", '-', '_');

if (modname == NULL)

goto error;

Py_DECREF(name);

Py_DECREF(encoded);

return modname;

error:

Py_DECREF(name);

Py_XDECREF(encoded);

return NULL;

}

void

_Py_ext_module_loader_info_clear(struct _Py_ext_module_loader_info *info)

{

Py_CLEAR(info->filename);

#ifndef MS_WINDOWS

Py_CLEAR(info->filename_encoded);

#endif

Py_CLEAR(info->name);

Py_CLEAR(info->name_encoded);

}

int

_Py_ext_module_loader_info_init(struct _Py_ext_module_loader_info *p_info,

PyObject *name, PyObject *filename,

_Py_ext_module_origin origin)

{

struct _Py_ext_module_loader_info info = {

.origin=origin,

};

assert(name != NULL);

if (!PyUnicode_Check(name)) {

PyErr_SetString(PyExc_TypeError,

"module name must be a string");

_Py_ext_module_loader_info_clear(&info);

return -1;

}

assert(PyUnicode_GetLength(name) > 0);

info.name = Py_NewRef(name);

info.name_encoded = get_encoded_name(info.name, &info.hook_prefixes);

if (info.name_encoded == NULL) {

_Py_ext_module_loader_info_clear(&info);

return -1;

}

info.newcontext = PyUnicode_AsUTF8(info.name);

if (info.newcontext == NULL) {

_Py_ext_module_loader_info_clear(&info);

return -1;

}

if (filename != NULL) {

if (!PyUnicode_Check(filename)) {

PyErr_SetString(PyExc_TypeError,

"module filename must be a string");

_Py_ext_module_loader_info_clear(&info);

return -1;

}

info.filename = Py_NewRef(filename);

#ifndef MS_WINDOWS

info.filename_encoded = PyUnicode_EncodeFSDefault(info.filename);

if (info.filename_encoded == NULL) {

_Py_ext_module_loader_info_clear(&info);

return -1;

}

#endif

info.path = info.filename;

}

else {

info.path = info.name;

}

*p_info = info;

return 0;

}

int

_Py_ext_module_loader_info_init_for_builtin(

struct _Py_ext_module_loader_info *info,

PyObject *name)

{

assert(PyUnicode_Check(name));

assert(PyUnicode_GetLength(name) > 0);

PyObject *name_encoded = PyUnicode_AsEncodedString(name, "ascii", NULL);

if (name_encoded == NULL) {

return -1;

}

*info = (struct _Py_ext_module_loader_info){

.name=Py_NewRef(name),

.name_encoded=name_encoded,

/* We won't need filename. */

.path=name,

.origin=_Py_ext_module_origin_BUILTIN,

.hook_prefixes=&ascii_only_prefixes,

.newcontext=NULL,

};

return 0;

}

int

_Py_ext_module_loader_info_init_for_core(

struct _Py_ext_module_loader_info *info,

PyObject *name)

{

if (_Py_ext_module_loader_info_init_for_builtin(info, name) < 0) {

return -1;

}

info->origin = _Py_ext_module_origin_CORE;

return 0;

}

#ifdef HAVE_DYNAMIC_LOADING

int

_Py_ext_module_loader_info_init_from_spec(

struct _Py_ext_module_loader_info *p_info,

PyObject *spec)

{

PyObject *name = PyObject_GetAttrString(spec, "name");

if (name == NULL) {

return -1;

}

PyObject *filename = PyObject_GetAttrString(spec, "origin");

if (filename == NULL) {

Py_DECREF(name);

return -1;

}

/* We could also accommodate builtin modules here without much trouble. */

_Py_ext_module_origin origin = _Py_ext_module_origin_DYNAMIC;

int err = _Py_ext_module_loader_info_init(p_info, name, filename, origin);

Py_DECREF(name);

Py_DECREF(filename);

return err;

}

#endif /* HAVE_DYNAMIC_LOADING */

/********************************/

/* module init function results */

/********************************/

void

_Py_ext_module_loader_result_clear(struct _Py_ext_module_loader_result *res)

{

/* Instead, the caller should have called

* _Py_ext_module_loader_result_apply_error(). */

assert(res->err == NULL);

*res = (struct _Py_ext_module_loader_result){0};

}

static void

_Py_ext_module_loader_result_set_error(

struct _Py_ext_module_loader_result *res,

enum _Py_ext_module_loader_result_error_kind kind)

{

#ifndef NDEBUG

switch (kind) {

case _Py_ext_module_loader_result_EXCEPTION: _Py_FALLTHROUGH;

case _Py_ext_module_loader_result_ERR_UNREPORTED_EXC:

assert(PyErr_Occurred());

break;

case _Py_ext_module_loader_result_ERR_MISSING: _Py_FALLTHROUGH;

case _Py_ext_module_loader_result_ERR_UNINITIALIZED: _Py_FALLTHROUGH;

case _Py_ext_module_loader_result_ERR_NONASCII_NOT_MULTIPHASE: _Py_FALLTHROUGH;

case _Py_ext_module_loader_result_ERR_NOT_MODULE: _Py_FALLTHROUGH;

case _Py_ext_module_loader_result_ERR_MISSING_DEF:

assert(!PyErr_Occurred());

break;

default:

/* We added a new error kind but forgot to add it to this switch. */

assert(0);

}

#endif

assert(res->err == NULL && res->_err.exc == NULL);

res->err = &res->_err;

*res->err = (struct _Py_ext_module_loader_result_error){

.kind=kind,

.exc=PyErr_GetRaisedException(),

};

/* For some kinds, we also set/check res->kind. */

switch (kind) {

case _Py_ext_module_loader_result_ERR_UNINITIALIZED:

assert(res->kind == _Py_ext_module_kind_UNKNOWN);

res->kind = _Py_ext_module_kind_INVALID;

break;

/* None of the rest affect the result kind. */

case _Py_ext_module_loader_result_EXCEPTION: _Py_FALLTHROUGH;

case _Py_ext_module_loader_result_ERR_MISSING: _Py_FALLTHROUGH;

case _Py_ext_module_loader_result_ERR_UNREPORTED_EXC: _Py_FALLTHROUGH;

case _Py_ext_module_loader_result_ERR_NONASCII_NOT_MULTIPHASE: _Py_FALLTHROUGH;

case _Py_ext_module_loader_result_ERR_NOT_MODULE: _Py_FALLTHROUGH;

case _Py_ext_module_loader_result_ERR_MISSING_DEF:

break;

default:

/* We added a new error kind but forgot to add it to this switch. */

assert(0);

}

void

_Py_ext_module_loader_result_apply_error(

struct _Py_ext_module_loader_result *res,

const char *name)

{

assert(!PyErr_Occurred());

assert(res->err != NULL && res->err == &res->_err);

struct _Py_ext_module_loader_result_error err = *res->err;

res->err = NULL;

/* We're otherwise done with the result at this point. */

_Py_ext_module_loader_result_clear(res);

#ifndef NDEBUG

switch (err.kind) {

case _Py_ext_module_loader_result_EXCEPTION: _Py_FALLTHROUGH;

case _Py_ext_module_loader_result_ERR_UNREPORTED_EXC:

assert(err.exc != NULL);

break;

case _Py_ext_module_loader_result_ERR_MISSING: _Py_FALLTHROUGH;

case _Py_ext_module_loader_result_ERR_UNINITIALIZED: _Py_FALLTHROUGH;

case _Py_ext_module_loader_result_ERR_NONASCII_NOT_MULTIPHASE: _Py_FALLTHROUGH;

case _Py_ext_module_loader_result_ERR_NOT_MODULE: _Py_FALLTHROUGH;

case _Py_ext_module_loader_result_ERR_MISSING_DEF:

assert(err.exc == NULL);

break;

default:

/* We added a new error kind but forgot to add it to this switch. */

assert(0);

}

#endif

const char *msg = NULL;

switch (err.kind) {

case _Py_ext_module_loader_result_EXCEPTION:

break;

case _Py_ext_module_loader_result_ERR_MISSING:

msg = "initialization of %s failed without raising an exception";

break;

case _Py_ext_module_loader_result_ERR_UNREPORTED_EXC:

msg = "initialization of %s raised unreported exception";

break;

case _Py_ext_module_loader_result_ERR_UNINITIALIZED:

msg = "init function of %s returned uninitialized object";

break;

case _Py_ext_module_loader_result_ERR_NONASCII_NOT_MULTIPHASE:

msg = "initialization of %s did not return PyModuleDef";

break;

case _Py_ext_module_loader_result_ERR_NOT_MODULE:

msg = "initialization of %s did not return an extension module";

break;

case _Py_ext_module_loader_result_ERR_MISSING_DEF:

msg = "initialization of %s did not return a valid extension module";

break;

default:

/* We added a new error kind but forgot to add it to this switch. */

assert(0);

PyErr_Format(PyExc_SystemError,

"loading %s failed due to init function", name);

return;

}

if (err.exc != NULL) {

PyErr_SetRaisedException(err.exc);

err.exc = NULL; /* PyErr_SetRaisedException() stole our reference. */

if (msg != NULL) {

_PyErr_FormatFromCause(PyExc_SystemError, msg, name);

}

else {

assert(msg != NULL);

PyErr_Format(PyExc_SystemError, msg, name);

}

/********************************************/

/* getting/running the module init function */

/********************************************/

#ifdef HAVE_DYNAMIC_LOADING

static dl_funcptr

findfuncptr(const char *prefix, const char *name_buf,

struct _Py_ext_module_loader_info *info,

FILE *fp)

{

#ifdef MS_WINDOWS

return _PyImport_FindSharedFuncptrWindows(

prefix, name_buf, info->filename, fp);

#else

const char *path_buf = PyBytes_AS_STRING(info->filename_encoded);

return _PyImport_FindSharedFuncptr(

prefix, name_buf, path_buf, fp);

#endif

}

int

_PyImport_GetModuleExportHooks(

struct _Py_ext_module_loader_info *info,

FILE *fp,

PyModInitFunction *modinit,

PyModExportFunction *modexport)

{

*modinit = NULL;

*modexport = NULL;

const char *name_buf = PyBytes_AS_STRING(info->name_encoded);

dl_funcptr exportfunc;

exportfunc = findfuncptr(

info->hook_prefixes->export_prefix,

name_buf, info, fp);

if (exportfunc) {

*modexport = (PyModExportFunction)exportfunc;

return 2;

}

if (PyErr_Occurred()) {

return -1;

}

exportfunc = findfuncptr(

info->hook_prefixes->init_prefix,

name_buf, info, fp);

if (exportfunc) {

*modinit = (PyModInitFunction)exportfunc;

return 1;

}

if (!PyErr_Occurred()) {

PyObject *msg;

msg = PyUnicode_FromFormat(

"dynamic module does not define "

"module export function (%s_%s or %s_%s)",

info->hook_prefixes->export_prefix, name_buf,

info->hook_prefixes->init_prefix, name_buf);

if (msg != NULL) {

PyErr_SetImportError(msg, info->name, info->filename);

Py_DECREF(msg);

}

return -1;

}

#endif /* HAVE_DYNAMIC_LOADING */

int

_PyImport_RunModInitFunc(PyModInitFunction p0,

struct _Py_ext_module_loader_info *info,

struct _Py_ext_module_loader_result *p_res)

{

struct _Py_ext_module_loader_result res = {

.kind=_Py_ext_module_kind_UNKNOWN,

};

/* Call the module init function. */

/* Package context is needed for single-phase init */

const char *oldcontext = _PyImport_SwapPackageContext(info->newcontext);

PyObject *m = p0();

_PyImport_SwapPackageContext(oldcontext);

/* Validate the result (and populate "res". */

if (m == NULL) {

/* The init func for multi-phase init modules is expected

* to return a PyModuleDef after calling PyModuleDef_Init().

* That function never raises an exception nor returns NULL,

* so at this point it must be a single-phase init modules. */

res.kind = _Py_ext_module_kind_SINGLEPHASE;

if (PyErr_Occurred()) {

_Py_ext_module_loader_result_set_error(

&res, _Py_ext_module_loader_result_EXCEPTION);

}

else {

_Py_ext_module_loader_result_set_error(

&res, _Py_ext_module_loader_result_ERR_MISSING);

}

goto error;

} else if (PyErr_Occurred()) {

/* Likewise, we infer that this is a single-phase init module. */

res.kind = _Py_ext_module_kind_SINGLEPHASE;

_Py_ext_module_loader_result_set_error(

&res, _Py_ext_module_loader_result_ERR_UNREPORTED_EXC);

/* We would probably be correct to decref m here,

* but we weren't doing so before,

* so we stick with doing nothing. */

m = NULL;

goto error;

}

if (Py_IS_TYPE(m, NULL)) {

/* This can happen when a PyModuleDef is returned without calling

* PyModuleDef_Init on it

_Py_ext_module_loader_result_set_error(

&res, _Py_ext_module_loader_result_ERR_UNINITIALIZED);

/* Likewise, decref'ing here makes sense. However, the original

* code has a note about "prevent segfault in DECREF",

* so we play it safe and leave it alone. */

m = NULL; /* prevent segfault in DECREF */

goto error;

}

if (PyObject_TypeCheck(m, &PyModuleDef_Type)) {

/* multi-phase init */

res.kind = _Py_ext_module_kind_MULTIPHASE;

res.def = (PyModuleDef *)m;

/* Run PyModule_FromDefAndSpec() to finish loading the module. */

}

else if (info->hook_prefixes == &nonascii_prefixes) {

/* Non-ASCII is only supported for multi-phase init. */

res.kind = _Py_ext_module_kind_MULTIPHASE;

/* Don't allow legacy init for non-ASCII module names. */

_Py_ext_module_loader_result_set_error(

&res, _Py_ext_module_loader_result_ERR_NONASCII_NOT_MULTIPHASE);

goto error;

}

else {

/* single-phase init (legacy) */

res.kind = _Py_ext_module_kind_SINGLEPHASE;

res.module = m;

if (!PyModule_Check(m)) {

_Py_ext_module_loader_result_set_error(

&res, _Py_ext_module_loader_result_ERR_NOT_MODULE);

goto error;

}

res.def = _PyModule_GetDefOrNull(m);

if (res.def == NULL) {

PyErr_Clear();

_Py_ext_module_loader_result_set_error(

&res, _Py_ext_module_loader_result_ERR_MISSING_DEF);

goto error;

}

assert(!PyErr_Occurred());

assert(res.err == NULL);

*p_res = res;

return 0;

error:

assert(!PyErr_Occurred());

assert(res.err != NULL);

Py_CLEAR(res.module);

res.def = NULL;

*p_res = res;

p_res->err = &p_res->_err;

return -1;

}

Terms
Privacy
Security
Status
Community
Docs
Contact
Manage cookies
Do not share my personal information

Navigation Menu

Repository navigation

Files

importdl.c

importdl.c

Navigation Menu

Repository navigation

FilesExpand file tree

Breadcrumbs

importdl.c

Latest commit

History

Breadcrumbs

importdl.c

File metadata and controls

Footer

Footer navigation

Files