cpython/Lib/bdb.py at 2.7 · python/cpython · GitHub

History

645 lines (556 loc) · 21.2 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

"""Debugger basics"""

import fnmatch

import sys

import os

import types

__all__ = ["BdbQuit","Bdb","Breakpoint"]

class BdbQuit(Exception):

"""Exception to give up completely"""

class Bdb:

"""Generic Python debugger base class.

This class takes care of details of the trace facility;

a derived class should implement user interaction.

The standard debugger class (pdb.Pdb) is an example.

"""

def __init__(self, skip=None):

self.skip = set(skip) if skip else None

self.breaks = {}

self.fncache = {}

self.frame_returning = None

def canonic(self, filename):

if filename == "<" + filename[1:-1] + ">":

return filename

canonic = self.fncache.get(filename)

if not canonic:

canonic = os.path.abspath(filename)

canonic = os.path.normcase(canonic)

self.fncache[filename] = canonic

return canonic

def reset(self):

import linecache

linecache.checkcache()

self.botframe = None

self._set_stopinfo(None, None)

def trace_dispatch(self, frame, event, arg):

if self.quitting:

return # None

if event == 'line':

return self.dispatch_line(frame)

if event == 'call':

return self.dispatch_call(frame, arg)

if event == 'return':

return self.dispatch_return(frame, arg)

if event == 'exception':

return self.dispatch_exception(frame, arg)

if event == 'c_call':

return self.trace_dispatch

if event == 'c_exception':

return self.trace_dispatch

if event == 'c_return':

return self.trace_dispatch

print 'bdb.Bdb.dispatch: unknown debugging event:', repr(event)

return self.trace_dispatch

def dispatch_line(self, frame):

if self.stop_here(frame) or self.break_here(frame):

self.user_line(frame)

if self.quitting: raise BdbQuit

return self.trace_dispatch

def dispatch_call(self, frame, arg):

# XXX 'arg' is no longer used

if self.botframe is None:

# First call of dispatch since reset()

self.botframe = frame.f_back # (CT) Note that this may also be None!

return self.trace_dispatch

if not (self.stop_here(frame) or self.break_anywhere(frame)):

# No need to trace this function

return # None

self.user_call(frame, arg)

if self.quitting: raise BdbQuit

return self.trace_dispatch

def dispatch_return(self, frame, arg):

if self.stop_here(frame) or frame == self.returnframe:

try:

self.frame_returning = frame

self.user_return(frame, arg)

finally:

self.frame_returning = None

if self.quitting: raise BdbQuit

return self.trace_dispatch

def dispatch_exception(self, frame, arg):

if self.stop_here(frame):

self.user_exception(frame, arg)

if self.quitting: raise BdbQuit

return self.trace_dispatch

# Normally derived classes don't override the following

# methods, but they may if they want to redefine the

# definition of stopping and breakpoints.

def is_skipped_module(self, module_name):

for pattern in self.skip:

if fnmatch.fnmatch(module_name, pattern):

return True

return False

def stop_here(self, frame):

# (CT) stopframe may now also be None, see dispatch_call.

# (CT) the former test for None is therefore removed from here.

if self.skip and \

self.is_skipped_module(frame.f_globals.get('__name__')):

return False

if frame is self.stopframe:

if self.stoplineno == -1:

return False

return frame.f_lineno >= self.stoplineno

while frame is not None and frame is not self.stopframe:

if frame is self.botframe:

return True

frame = frame.f_back

return False

def break_here(self, frame):

filename = self.canonic(frame.f_code.co_filename)

if not filename in self.breaks:

return False

lineno = frame.f_lineno

if not lineno in self.breaks[filename]:

# The line itself has no breakpoint, but maybe the line is the

# first line of a function with breakpoint set by function name.

lineno = frame.f_code.co_firstlineno

if not lineno in self.breaks[filename]:

return False

# flag says ok to delete temp. bp

(bp, flag) = effective(filename, lineno, frame)

if bp:

self.currentbp = bp.number

if (flag and bp.temporary):

self.do_clear(str(bp.number))

return True

else:

return False

def do_clear(self, arg):

raise NotImplementedError, "subclass of bdb must implement do_clear()"

def break_anywhere(self, frame):

return self.canonic(frame.f_code.co_filename) in self.breaks

# Derived classes should override the user_* methods

# to gain control.

def user_call(self, frame, argument_list):

"""This method is called when there is the remote possibility

that we ever need to stop in this function."""

pass

def user_line(self, frame):

"""This method is called when we stop or break at this line."""

pass

def user_return(self, frame, return_value):

"""This method is called when a return trap is set here."""

pass

def user_exception(self, frame, exc_info):

exc_type, exc_value, exc_traceback = exc_info

"""This method is called if an exception occurs,

but only if we are to stop at or just below this level."""

pass

def _set_stopinfo(self, stopframe, returnframe, stoplineno=0):

self.stopframe = stopframe

self.returnframe = returnframe

self.quitting = 0

# stoplineno >= 0 means: stop at line >= the stoplineno

# stoplineno -1 means: don't stop at all

self.stoplineno = stoplineno

# Derived classes and clients can call the following methods

# to affect the stepping state.

def set_until(self, frame): #the name "until" is borrowed from gdb

"""Stop when the line with the line no greater than the current one is

reached or when returning from current frame"""

self._set_stopinfo(frame, frame, frame.f_lineno+1)

def set_step(self):

"""Stop after one line of code."""

# Issue #13183: pdb skips frames after hitting a breakpoint and running

# step commands.

# Restore the trace function in the caller (that may not have been set

# for performance reasons) when returning from the current frame.

if self.frame_returning:

caller_frame = self.frame_returning.f_back

if caller_frame and not caller_frame.f_trace:

caller_frame.f_trace = self.trace_dispatch

self._set_stopinfo(None, None)

def set_next(self, frame):

"""Stop on the next line in or below the given frame."""

self._set_stopinfo(frame, None)

def set_return(self, frame):

"""Stop when returning from the given frame."""

self._set_stopinfo(frame.f_back, frame)

def set_trace(self, frame=None):

"""Start debugging from `frame`.

If frame is not specified, debugging starts from caller's frame.

"""

if frame is None:

frame = sys._getframe().f_back

self.reset()

while frame:

frame.f_trace = self.trace_dispatch

self.botframe = frame

frame = frame.f_back

self.set_step()

sys.settrace(self.trace_dispatch)

def set_continue(self):

# Don't stop except at breakpoints or when finished

self._set_stopinfo(self.botframe, None, -1)

if not self.breaks:

# no breakpoints; run without debugger overhead

sys.settrace(None)

frame = sys._getframe().f_back

while frame and frame is not self.botframe:

del frame.f_trace

frame = frame.f_back

def set_quit(self):

self.stopframe = self.botframe

self.returnframe = None

self.quitting = 1

sys.settrace(None)

# Derived classes and clients can call the following methods

# to manipulate breakpoints. These methods return an

# error message is something went wrong, None if all is well.

# Set_break prints out the breakpoint line and file:lineno.

# Call self.get_*break*() to see the breakpoints or better

# for bp in Breakpoint.bpbynumber: if bp: bp.bpprint().

def set_break(self, filename, lineno, temporary=0, cond = None,

funcname=None):

filename = self.canonic(filename)

import linecache # Import as late as possible

line = linecache.getline(filename, lineno)

if not line:

return 'Line %s:%d does not exist' % (filename,

lineno)

if not filename in self.breaks:

self.breaks[filename] = []

list = self.breaks[filename]

if not lineno in list:

list.append(lineno)

bp = Breakpoint(filename, lineno, temporary, cond, funcname)

def _prune_breaks(self, filename, lineno):

if (filename, lineno) not in Breakpoint.bplist:

self.breaks[filename].remove(lineno)

if not self.breaks[filename]:

del self.breaks[filename]

def clear_break(self, filename, lineno):

filename = self.canonic(filename)

if not filename in self.breaks:

return 'There are no breakpoints in %s' % filename

if lineno not in self.breaks[filename]:

return 'There is no breakpoint at %s:%d' % (filename,

lineno)

# If there's only one bp in the list for that file,line

# pair, then remove the breaks entry

for bp in Breakpoint.bplist[filename, lineno][:]:

bp.deleteMe()

self._prune_breaks(filename, lineno)

def clear_bpbynumber(self, arg):

try:

number = int(arg)

except:

return 'Non-numeric breakpoint number (%s)' % arg

try:

bp = Breakpoint.bpbynumber[number]

except IndexError:

return 'Breakpoint number (%d) out of range' % number

if not bp:

return 'Breakpoint (%d) already deleted' % number

bp.deleteMe()

self._prune_breaks(bp.file, bp.line)

def clear_all_file_breaks(self, filename):

filename = self.canonic(filename)

if not filename in self.breaks:

return 'There are no breakpoints in %s' % filename

for line in self.breaks[filename]:

blist = Breakpoint.bplist[filename, line]

for bp in blist:

bp.deleteMe()

del self.breaks[filename]

def clear_all_breaks(self):

if not self.breaks:

return 'There are no breakpoints'

for bp in Breakpoint.bpbynumber:

if bp:

bp.deleteMe()

self.breaks = {}

def get_break(self, filename, lineno):

filename = self.canonic(filename)

return filename in self.breaks and \

lineno in self.breaks[filename]

def get_breaks(self, filename, lineno):

filename = self.canonic(filename)

return filename in self.breaks and \

lineno in self.breaks[filename] and \

Breakpoint.bplist[filename, lineno] or []

def get_file_breaks(self, filename):

filename = self.canonic(filename)

if filename in self.breaks:

return self.breaks[filename]

else:

return []

def get_all_breaks(self):

return self.breaks

# Derived classes and clients can call the following method

# to get a data structure representing a stack trace.

def get_stack(self, f, t):

stack = []

if t and t.tb_frame is f:

t = t.tb_next

while f is not None:

stack.append((f, f.f_lineno))

if f is self.botframe:

break

f = f.f_back

stack.reverse()

i = max(0, len(stack) - 1)

while t is not None:

stack.append((t.tb_frame, t.tb_lineno))

t = t.tb_next

if f is None:

i = max(0, len(stack) - 1)

return stack, i

def format_stack_entry(self, frame_lineno, lprefix=': '):

import linecache, repr

frame, lineno = frame_lineno

filename = self.canonic(frame.f_code.co_filename)

s = '%s(%r)' % (filename, lineno)

if frame.f_code.co_name:

s = s + frame.f_code.co_name

else:

s = s + "<lambda>"

if '__args__' in frame.f_locals:

args = frame.f_locals['__args__']

else:

args = None

if args:

s = s + repr.repr(args)

else:

s = s + '()'

if '__return__' in frame.f_locals:

rv = frame.f_locals['__return__']

s = s + '->'

s = s + repr.repr(rv)

line = linecache.getline(filename, lineno, frame.f_globals)

if line: s = s + lprefix + line.strip()

return s

# The following two methods can be called by clients to use

# a debugger to debug a statement, given as a string.

def run(self, cmd, globals=None, locals=None):

if globals is None:

import __main__

globals = __main__.__dict__

if locals is None:

locals = globals

self.reset()

sys.settrace(self.trace_dispatch)

if not isinstance(cmd, types.CodeType):

cmd = cmd+'\n'

try:

exec cmd in globals, locals

except BdbQuit:

pass

finally:

self.quitting = 1

sys.settrace(None)

def runeval(self, expr, globals=None, locals=None):

if globals is None:

import __main__

globals = __main__.__dict__

if locals is None:

locals = globals

self.reset()

sys.settrace(self.trace_dispatch)

if not isinstance(expr, types.CodeType):

expr = expr+'\n'

try:

return eval(expr, globals, locals)

except BdbQuit:

pass

finally:

self.quitting = 1

sys.settrace(None)

def runctx(self, cmd, globals, locals):

# B/W compatibility

self.run(cmd, globals, locals)

# This method is more useful to debug a single function call.

def runcall(self, func, *args, **kwds):

self.reset()

sys.settrace(self.trace_dispatch)

res = None

try:

res = func(*args, **kwds)

except BdbQuit:

pass

finally:

self.quitting = 1

sys.settrace(None)

return res

def set_trace():

Bdb().set_trace()

class Breakpoint:

"""Breakpoint class

Implements temporary breakpoints, ignore counts, disabling and

(re)-enabling, and conditionals.

Breakpoints are indexed by number through bpbynumber and by

the file,line tuple using bplist. The former points to a

single instance of class Breakpoint. The latter points to a

list of such instances since there may be more than one

breakpoint per line.

"""

# XXX Keeping state in the class is a mistake -- this means

# you cannot have more than one active Bdb instance.

next = 1 # Next bp to be assigned

bplist = {} # indexed by (file, lineno) tuple

bpbynumber = [None] # Each entry is None or an instance of Bpt

# index 0 is unused, except for marking an

# effective break .... see effective()

def __init__(self, file, line, temporary=0, cond=None, funcname=None):

self.funcname = funcname

# Needed if funcname is not None.

self.func_first_executable_line = None

self.file = file # This better be in canonical form!

self.line = line

self.temporary = temporary

self.cond = cond

self.enabled = 1

self.ignore = 0

self.hits = 0

self.number = Breakpoint.next

Breakpoint.next = Breakpoint.next + 1

# Build the two lists

self.bpbynumber.append(self)

if (file, line) in self.bplist:

self.bplist[file, line].append(self)

else:

self.bplist[file, line] = [self]

def deleteMe(self):

index = (self.file, self.line)

self.bpbynumber[self.number] = None # No longer in list

self.bplist[index].remove(self)

if not self.bplist[index]:

# No more bp for this f:l combo

del self.bplist[index]

def enable(self):

self.enabled = 1

def disable(self):

self.enabled = 0

def bpprint(self, out=None):

if out is None:

out = sys.stdout

if self.temporary:

disp = 'del '

else:

disp = 'keep '

if self.enabled:

disp = disp + 'yes '

else:

disp = disp + 'no '

print >>out, '%-4dbreakpoint %s at %s:%d' % (self.number, disp,

self.file, self.line)

if self.cond:

print >>out, '\tstop only if %s' % (self.cond,)

if self.ignore:

print >>out, '\tignore next %d hits' % (self.ignore)

if (self.hits):

if (self.hits > 1): ss = 's'

else: ss = ''

print >>out, ('\tbreakpoint already hit %d time%s' %

(self.hits, ss))

# -----------end of Breakpoint class----------

def checkfuncname(b, frame):

"""Check whether we should break here because of `b.funcname`."""

if not b.funcname:

# Breakpoint was set via line number.

if b.line != frame.f_lineno:

# Breakpoint was set at a line with a def statement and the function

# defined is called: don't break.

return False

return True

# Breakpoint set via function name.

if frame.f_code.co_name != b.funcname:

# It's not a function call, but rather execution of def statement.

return False

# We are in the right frame.

if not b.func_first_executable_line:

# The function is entered for the 1st time.

b.func_first_executable_line = frame.f_lineno

if b.func_first_executable_line != frame.f_lineno:

# But we are not at the first line number: don't break.

return False

return True

# Determines if there is an effective (active) breakpoint at this

# line of code. Returns breakpoint number or 0 if none

def effective(file, line, frame):

"""Determine which breakpoint for this file:line is to be acted upon.

Called only if we know there is a bpt at this

location. Returns breakpoint that was triggered and a flag

that indicates if it is ok to delete a temporary bp.

"""

possibles = Breakpoint.bplist[file,line]

for i in range(0, len(possibles)):

b = possibles[i]

if b.enabled == 0:

continue

if not checkfuncname(b, frame):

continue

# Count every hit when bp is enabled

b.hits = b.hits + 1

if not b.cond:

# If unconditional, and ignoring,

# go on to next, else break

if b.ignore > 0:

b.ignore = b.ignore -1

continue

else:

# breakpoint and marker that's ok

# to delete if temporary

return (b,1)

else:

# Conditional bp.

# Ignore count applies only to those bpt hits where the

# condition evaluates to true.

try:

val = eval(b.cond, frame.f_globals,

frame.f_locals)

if val:

if b.ignore > 0:

b.ignore = b.ignore -1

# continue

else:

return (b,1)

# else:

# continue

except:

# if eval fails, most conservative

# thing is to stop on breakpoint

# regardless of ignore count.

# Don't delete temporary,

# as another hint to user.

return (b,0)

return (None, None)

# -------------------- testing --------------------

class Tdb(Bdb):

def user_call(self, frame, args):

name = frame.f_code.co_name

if not name: name = '???'

print '+++ call', name, args

def user_line(self, frame):

import linecache

name = frame.f_code.co_name

if not name: name = '???'

fn = self.canonic(frame.f_code.co_filename)

line = linecache.getline(fn, frame.f_lineno, frame.f_globals)

print '+++', fn, frame.f_lineno, name, ':', line.strip()

def user_return(self, frame, retval):

print '+++ return', retval

def user_exception(self, frame, exc_stuff):

print '+++ exception', exc_stuff

self.set_continue()

def foo(n):

print 'foo(', n, ')'

x = bar(n*10)

print 'bar returned', x

def bar(a):

print 'bar(', a, ')'

return a/2

def test():

t = Tdb()

t.run('import bdb; bdb.foo(10)')

# end

cpython/Lib/bdb.py at 2.7 · python/cpython · GitHub

Uh oh!

Uh oh!

cpython/Lib/bdb.py at 2.7 · python/cpython · GitHub

Uh oh!

Uh oh!

Expand file tree

Breadcrumbs

bdb.py

Latest commit

History

Breadcrumbs

bdb.py

File metadata and controls