cpython/Python/modsupport.c at c81a5e6b5b7749862d271e7a67f89976069ad2cd · python/cpython · GitHub

History

649 lines (585 loc) · 16 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

/* Module support implementation */

#include "Python.h"

#include "pycore_abstract.h" // _PyIndex_Check()

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

typedef double va_double;

static PyObject *va_build_value(const char *, va_list);

int

_Py_convert_optional_to_ssize_t(PyObject *obj, void *result)

{

Py_ssize_t limit;

if (obj == Py_None) {

return 1;

}

else if (_PyIndex_Check(obj)) {

limit = PyNumber_AsSsize_t(obj, PyExc_OverflowError);

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

return 0;

}

else {

PyErr_Format(PyExc_TypeError,

"argument should be integer or None, not '%.200s'",

Py_TYPE(obj)->tp_name);

return 0;

}

*((Py_ssize_t *)result) = limit;

return 1;

}

/* Helper for mkvalue() to scan the length of a format */

static Py_ssize_t

countformat(const char *format, char endchar)

{

Py_ssize_t count = 0;

int level = 0;

while (level > 0 || *format != endchar) {

switch (*format) {

case '\0':

/* Premature end */

PyErr_SetString(PyExc_SystemError,

"unmatched paren in format");

return -1;

case '(':

case '[':

case '{':

if (level == 0) {

count++;

}

level++;

break;

case ')':

case ']':

case '}':

level--;

break;

case '#':

case '&':

case ',':

case ':':

case ' ':

case '\t':

break;

default:

if (level == 0) {

count++;

}

format++;

}

return count;

}

/* Generic function to create a value -- the inverse of getargs() */

/* After an original idea and first implementation by Steven Miale */

static PyObject *do_mktuple(const char**, va_list *, char, Py_ssize_t);

static int do_mkstack(PyObject **, const char**, va_list *, char, Py_ssize_t);

static PyObject *do_mklist(const char**, va_list *, char, Py_ssize_t);

static PyObject *do_mkdict(const char**, va_list *, char, Py_ssize_t);

static PyObject *do_mkvalue(const char**, va_list *);

static int

check_end(const char **p_format, char endchar)

{

const char *f = *p_format;

while (*f != endchar) {

if (*f != ' ' && *f != '\t' && *f != ',' && *f != ':') {

PyErr_SetString(PyExc_SystemError,

"Unmatched paren in format");

return 0;

}

f++;

}

if (endchar) {

f++;

}

*p_format = f;

return 1;

}

static void

do_ignore(const char **p_format, va_list *p_va, char endchar, Py_ssize_t n)

{

assert(PyErr_Occurred());

PyObject *v = PyTuple_New(n);

for (Py_ssize_t i = 0; i < n; i++) {

PyObject *exc = PyErr_GetRaisedException();

PyObject *w = do_mkvalue(p_format, p_va);

PyErr_SetRaisedException(exc);

if (w != NULL) {

if (v != NULL) {

PyTuple_SET_ITEM(v, i, w);

}

else {

Py_DECREF(w);

}

Py_XDECREF(v);

if (!check_end(p_format, endchar)) {

return;

}

static PyObject *

do_mkdict(const char **p_format, va_list *p_va, char endchar, Py_ssize_t n)

{

PyObject *d;

Py_ssize_t i;

if (n < 0)

return NULL;

if (n % 2) {

PyErr_SetString(PyExc_SystemError,

"Bad dict format");

do_ignore(p_format, p_va, endchar, n);

return NULL;

}

/* Note that we can't bail immediately on error as this will leak

refcounts on any 'N' arguments. */

if ((d = PyDict_New()) == NULL) {

do_ignore(p_format, p_va, endchar, n);

return NULL;

}

for (i = 0; i < n; i+= 2) {

PyObject *k, *v;

k = do_mkvalue(p_format, p_va);

if (k == NULL) {

do_ignore(p_format, p_va, endchar, n - i - 1);

Py_DECREF(d);

return NULL;

}

v = do_mkvalue(p_format, p_va);

if (v == NULL || PyDict_SetItem(d, k, v) < 0) {

do_ignore(p_format, p_va, endchar, n - i - 2);

Py_DECREF(k);

Py_XDECREF(v);

Py_DECREF(d);

return NULL;

}

Py_DECREF(k);

Py_DECREF(v);

}

if (!check_end(p_format, endchar)) {

Py_DECREF(d);

return NULL;

}

return d;

}

static PyObject *

do_mklist(const char **p_format, va_list *p_va, char endchar, Py_ssize_t n)

{

PyObject *v;

Py_ssize_t i;

if (n < 0)

return NULL;

/* Note that we can't bail immediately on error as this will leak

refcounts on any 'N' arguments. */

v = PyList_New(n);

if (v == NULL) {

do_ignore(p_format, p_va, endchar, n);

return NULL;

}

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

PyObject *w = do_mkvalue(p_format, p_va);

if (w == NULL) {

do_ignore(p_format, p_va, endchar, n - i - 1);

Py_DECREF(v);

return NULL;

}

PyList_SET_ITEM(v, i, w);

}

if (!check_end(p_format, endchar)) {

Py_DECREF(v);

return NULL;

}

return v;

}

static int

do_mkstack(PyObject **stack, const char **p_format, va_list *p_va,

char endchar, Py_ssize_t n)

{

Py_ssize_t i;

if (n < 0) {

return -1;

}

/* Note that we can't bail immediately on error as this will leak

refcounts on any 'N' arguments. */

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

PyObject *w = do_mkvalue(p_format, p_va);

if (w == NULL) {

do_ignore(p_format, p_va, endchar, n - i - 1);

goto error;

}

stack[i] = w;

}

if (!check_end(p_format, endchar)) {

goto error;

}

return 0;

error:

n = i;

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

Py_DECREF(stack[i]);

}

return -1;

}

static PyObject *

do_mktuple(const char **p_format, va_list *p_va, char endchar, Py_ssize_t n)

{

PyObject *v;

Py_ssize_t i;

if (n < 0)

return NULL;

/* Note that we can't bail immediately on error as this will leak

refcounts on any 'N' arguments. */

if ((v = PyTuple_New(n)) == NULL) {

do_ignore(p_format, p_va, endchar, n);

return NULL;

}

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

PyObject *w = do_mkvalue(p_format, p_va);

if (w == NULL) {

do_ignore(p_format, p_va, endchar, n - i - 1);

Py_DECREF(v);

return NULL;

}

PyTuple_SET_ITEM(v, i, w);

}

if (!check_end(p_format, endchar)) {

Py_DECREF(v);

return NULL;

}

return v;

}

static PyObject *

do_mkvalue(const char **p_format, va_list *p_va)

{

for (;;) {

switch (*(*p_format)++) {

case '(':

return do_mktuple(p_format, p_va, ')',

countformat(*p_format, ')'));

case '[':

return do_mklist(p_format, p_va, ']',

countformat(*p_format, ']'));

case '{':

return do_mkdict(p_format, p_va, '}',

countformat(*p_format, '}'));

case 'b':

case 'B':

case 'h':

case 'i':

return PyLong_FromLong((long)va_arg(*p_va, int));

case 'H':

return PyLong_FromLong((long)va_arg(*p_va, unsigned int));

case 'I':

{

unsigned int n;

n = va_arg(*p_va, unsigned int);

return PyLong_FromUnsignedLong(n);

}

case 'n':

#if SIZEOF_SIZE_T!=SIZEOF_LONG

return PyLong_FromSsize_t(va_arg(*p_va, Py_ssize_t));

#endif

/* Fall through from 'n' to 'l' if Py_ssize_t is long */

case 'l':

return PyLong_FromLong(va_arg(*p_va, long));

case 'k':

{

unsigned long n;

n = va_arg(*p_va, unsigned long);

return PyLong_FromUnsignedLong(n);

}

case 'L':

return PyLong_FromLongLong((long long)va_arg(*p_va, long long));

case 'K':

return PyLong_FromUnsignedLongLong((long long)va_arg(*p_va, unsigned long long));

case 'u':

{

PyObject *v;

const wchar_t *u = va_arg(*p_va, wchar_t*);

Py_ssize_t n;

if (**p_format == '#') {

++*p_format;

n = va_arg(*p_va, Py_ssize_t);

}

else

n = -1;

if (u == NULL) {

v = Py_NewRef(Py_None);

}

else {

if (n < 0)

n = wcslen(u);

v = PyUnicode_FromWideChar(u, n);

}

return v;

}

case 'f':

case 'd':

return PyFloat_FromDouble(

(double)va_arg(*p_va, va_double));

case 'D':

return PyComplex_FromCComplex(

*((Py_complex *)va_arg(*p_va, Py_complex *)));

case 'c':

{

char p[1];

p[0] = (char)va_arg(*p_va, int);

return PyBytes_FromStringAndSize(p, 1);

}

case 'C':

{

int i = va_arg(*p_va, int);

return PyUnicode_FromOrdinal(i);

}

case 's':

case 'z':

case 'U': /* XXX deprecated alias */

{

PyObject *v;

const char *str = va_arg(*p_va, const char *);

Py_ssize_t n;

if (**p_format == '#') {

++*p_format;

n = va_arg(*p_va, Py_ssize_t);

}

else

n = -1;

if (str == NULL) {

v = Py_NewRef(Py_None);

}

else {

if (n < 0) {

size_t m = strlen(str);

if (m > PY_SSIZE_T_MAX) {

PyErr_SetString(PyExc_OverflowError,

"string too long for Python string");

return NULL;

}

n = (Py_ssize_t)m;

}

v = PyUnicode_FromStringAndSize(str, n);

}

return v;

}

case 'y':

{

PyObject *v;

const char *str = va_arg(*p_va, const char *);

Py_ssize_t n;

if (**p_format == '#') {

++*p_format;

n = va_arg(*p_va, Py_ssize_t);

}

else

n = -1;

if (str == NULL) {

v = Py_NewRef(Py_None);

}

else {

if (n < 0) {

size_t m = strlen(str);

if (m > PY_SSIZE_T_MAX) {

PyErr_SetString(PyExc_OverflowError,

"string too long for Python bytes");

return NULL;

}

n = (Py_ssize_t)m;

}

v = PyBytes_FromStringAndSize(str, n);

}

return v;

}

case 'N':

case 'S':

case 'O':

if (**p_format == '&') {

typedef PyObject *(*converter)(void *);

converter func = va_arg(*p_va, converter);

void *arg = va_arg(*p_va, void *);

++*p_format;

return (*func)(arg);

}

else {

PyObject *v;

v = va_arg(*p_va, PyObject *);

if (v != NULL) {

if (*(*p_format - 1) != 'N')

Py_INCREF(v);

}

else if (!PyErr_Occurred())

/* If a NULL was passed

* because a call that should

* have constructed a value

* failed, that's OK, and we

* pass the error on; but if

* no error occurred it's not

* clear that the caller knew

* what she was doing. */

PyErr_SetString(PyExc_SystemError,

"NULL object passed to Py_BuildValue");

return v;

}

case ':':

case ',':

case ' ':

case '\t':

break;

default:

PyErr_SetString(PyExc_SystemError,

"bad format char passed to Py_BuildValue");

return NULL;

}

PyObject *

Py_BuildValue(const char *format, ...)

{

va_list va;

PyObject* retval;

va_start(va, format);

retval = va_build_value(format, va);

va_end(va);

return retval;

}

PyAPI_FUNC(PyObject *) /* abi only */

_Py_BuildValue_SizeT(const char *format, ...)

{

va_list va;

PyObject* retval;

va_start(va, format);

retval = va_build_value(format, va);

va_end(va);

return retval;

}

PyObject *

Py_VaBuildValue(const char *format, va_list va)

{

return va_build_value(format, va);

}

PyAPI_FUNC(PyObject *) /* abi only */

_Py_VaBuildValue_SizeT(const char *format, va_list va)

{

return va_build_value(format, va);

}

static PyObject *

va_build_value(const char *format, va_list va)

{

const char *f = format;

Py_ssize_t n = countformat(f, '\0');

va_list lva;

PyObject *retval;

if (n < 0)

return NULL;

if (n == 0) {

Py_RETURN_NONE;

}

va_copy(lva, va);

if (n == 1) {

retval = do_mkvalue(&f, &lva);

} else {

retval = do_mktuple(&f, &lva, '\0', n);

}

va_end(lva);

return retval;

}

PyObject **

_Py_VaBuildStack(PyObject **small_stack, Py_ssize_t small_stack_len,

const char *format, va_list va, Py_ssize_t *p_nargs)

{

const char *f;

Py_ssize_t n;

va_list lva;

PyObject **stack;

int res;

n = countformat(format, '\0');

if (n < 0) {

*p_nargs = 0;

return NULL;

}

if (n == 0) {

*p_nargs = 0;

return small_stack;

}

if (n <= small_stack_len) {

stack = small_stack;

}

else {

stack = PyMem_Malloc(n * sizeof(stack[0]));

if (stack == NULL) {

PyErr_NoMemory();

return NULL;

}

va_copy(lva, va);

f = format;

res = do_mkstack(stack, &f, &lva, '\0', n);

va_end(lva);

if (res < 0) {

if (stack != small_stack) {

PyMem_Free(stack);

}

return NULL;

}

*p_nargs = n;

return stack;

}

int

PyModule_AddObjectRef(PyObject *mod, const char *name, PyObject *value)

{

if (!PyModule_Check(mod)) {

PyErr_SetString(PyExc_TypeError,

"PyModule_AddObjectRef() first argument "

"must be a module");

return -1;

}

if (!value) {

if (!PyErr_Occurred()) {

PyErr_SetString(PyExc_SystemError,

"PyModule_AddObjectRef() must be called "

"with an exception raised if value is NULL");

}

return -1;

}

PyObject *dict = PyModule_GetDict(mod);

if (dict == NULL) {

/* Internal error -- modules must have a dict! */

PyErr_Format(PyExc_SystemError, "module '%s' has no __dict__",

PyModule_GetName(mod));

return -1;

}

return PyDict_SetItemString(dict, name, value);

}

int

PyModule_Add(PyObject *mod, const char *name, PyObject *value)

{

int res = PyModule_AddObjectRef(mod, name, value);

Py_XDECREF(value);

return res;

}

int

PyModule_AddObject(PyObject *mod, const char *name, PyObject *value)

{

int res = PyModule_AddObjectRef(mod, name, value);

if (res == 0) {

Py_DECREF(value);

}

return res;

}

int

PyModule_AddIntConstant(PyObject *m, const char *name, long value)

{

return PyModule_Add(m, name, PyLong_FromLong(value));

}

int

PyModule_AddStringConstant(PyObject *m, const char *name, const char *value)

{

return PyModule_Add(m, name, PyUnicode_FromString(value));

}

int

PyModule_AddType(PyObject *module, PyTypeObject *type)

{

if (!_PyType_IsReady(type) && PyType_Ready(type) < 0) {

return -1;

}

const char *name = _PyType_Name(type);

assert(name != NULL);

return PyModule_AddObjectRef(module, name, (PyObject *)type);

}

cpython/Python/modsupport.c at c81a5e6b5b7749862d271e7a67f89976069ad2cd · python/cpython · GitHub

Uh oh!

Expand file tree

Breadcrumbs

modsupport.c

Latest commit

History

Breadcrumbs

modsupport.c

File metadata and controls