/usr/share/gdb/auto-load/lib32/libpthread-2.27.so-gdb.py is in libc6-dev-i386 2.27-3ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 | # Pretty printers for the NPTL lock types.
#
# Copyright (C) 2016-2018 Free Software Foundation, Inc.
# This file is part of the GNU C Library.
#
# The GNU C Library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# The GNU C Library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with the GNU C Library; if not, see
# <http://www.gnu.org/licenses/>.
"""This file contains the gdb pretty printers for the following types:
* pthread_mutex_t
* pthread_mutexattr_t
* pthread_cond_t
* pthread_condattr_t
* pthread_rwlock_t
* pthread_rwlockattr_t
You can check which printers are registered and enabled by issuing the
'info pretty-printer' gdb command. Printers should trigger automatically when
trying to print a variable of one of the types mentioned above.
"""
from __future__ import print_function
import gdb
import gdb.printing
# GENERATED FILE\n
# Constant definitions for pretty printers.
# See gen-py-const.awk for details.\n
PTHREAD_MUTEX_KIND_MASK = 3
PTHREAD_MUTEX_NORMAL = 0
PTHREAD_MUTEX_RECURSIVE = 1
PTHREAD_MUTEX_ERRORCHECK = 2
PTHREAD_MUTEX_ADAPTIVE_NP = 3
PTHREAD_MUTEX_DESTROYED = -1
PTHREAD_MUTEX_UNLOCKED = 0
PTHREAD_MUTEX_LOCKED_NO_WAITERS = 1
PTHREAD_MUTEX_INCONSISTENT = 2147483647
PTHREAD_MUTEX_NOTRECOVERABLE = 2147483646
FUTEX_OWNER_DIED = 1073741824
FUTEX_WAITERS = -2147483648
FUTEX_TID_MASK = 1073741823
PTHREAD_MUTEX_ROBUST_NORMAL_NP = 16
PTHREAD_MUTEX_PRIO_INHERIT_NP = 32
PTHREAD_MUTEX_PRIO_PROTECT_NP = 64
PTHREAD_MUTEX_PSHARED_BIT = 128
PTHREAD_MUTEX_PRIO_CEILING_SHIFT = 19
PTHREAD_MUTEX_PRIO_CEILING_MASK = -524288
PTHREAD_MUTEXATTR_PROTOCOL_SHIFT = 28
PTHREAD_MUTEXATTR_PROTOCOL_MASK = 805306368
PTHREAD_MUTEXATTR_PRIO_CEILING_MASK = 16773120
PTHREAD_MUTEXATTR_FLAG_ROBUST = 1073741824
PTHREAD_MUTEXATTR_FLAG_PSHARED = -2147483648
PTHREAD_MUTEXATTR_FLAG_BITS = -251662336
PTHREAD_MUTEX_NO_ELISION_NP = 512
PTHREAD_PRIO_NONE = 0
PTHREAD_PRIO_INHERIT = 1
PTHREAD_PRIO_PROTECT = 2
PTHREAD_COND_SHARED_MASK = 1
PTHREAD_COND_CLOCK_MONOTONIC_MASK = 2
COND_CLOCK_BITS = 1
PTHREAD_COND_WREFS_SHIFT = 3
PTHREAD_RWLOCK_PREFER_READER_NP = 0
PTHREAD_RWLOCK_PREFER_WRITER_NP = 1
PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP = 2
PTHREAD_RWLOCK_WRPHASE = 1
PTHREAD_RWLOCK_WRLOCKED = 2
PTHREAD_RWLOCK_READER_SHIFT = 3
PTHREAD_PROCESS_PRIVATE = 0
PTHREAD_PROCESS_SHARED = 1
MUTEX_TYPES = {
PTHREAD_MUTEX_NORMAL: ('Type', 'Normal'),
PTHREAD_MUTEX_RECURSIVE: ('Type', 'Recursive'),
PTHREAD_MUTEX_ERRORCHECK: ('Type', 'Error check'),
PTHREAD_MUTEX_ADAPTIVE_NP: ('Type', 'Adaptive')
}
class MutexPrinter(object):
"""Pretty printer for pthread_mutex_t."""
def __init__(self, mutex):
"""Initialize the printer's internal data structures.
Args:
mutex: A gdb.value representing a pthread_mutex_t.
"""
data = mutex['__data']
self.lock = data['__lock']
self.count = data['__count']
self.owner = data['__owner']
self.kind = data['__kind']
self.values = []
self.read_values()
def to_string(self):
"""gdb API function.
This is called from gdb when we try to print a pthread_mutex_t.
"""
return 'pthread_mutex_t'
def children(self):
"""gdb API function.
This is called from gdb when we try to print a pthread_mutex_t.
"""
return self.values
def read_values(self):
"""Read the mutex's info and store it in self.values.
The data contained in self.values will be returned by the Iterator
created in self.children.
"""
self.read_type()
self.read_status()
self.read_attributes()
self.read_misc_info()
def read_type(self):
"""Read the mutex's type."""
mutex_type = self.kind & PTHREAD_MUTEX_KIND_MASK
# mutex_type must be casted to int because it's a gdb.Value
self.values.append(MUTEX_TYPES[int(mutex_type)])
def read_status(self):
"""Read the mutex's status.
Architectures that support lock elision might not record the mutex owner
ID in the __owner field. In that case, the owner will be reported as
"Unknown".
"""
if self.kind == PTHREAD_MUTEX_DESTROYED:
self.values.append(('Status', 'Destroyed'))
elif self.kind & PTHREAD_MUTEX_ROBUST_NORMAL_NP:
self.read_status_robust()
else:
self.read_status_no_robust()
def read_status_robust(self):
"""Read the status of a robust mutex.
In glibc robust mutexes are implemented in a very different way than
non-robust ones. This method reads their locking status,
whether it may have waiters, their registered owner (if any),
whether the owner is alive or not, and the status of the state
they're protecting.
"""
if self.lock == PTHREAD_MUTEX_UNLOCKED:
self.values.append(('Status', 'Not acquired'))
else:
if self.lock & FUTEX_WAITERS:
self.values.append(('Status',
'Acquired, possibly with waiters'))
else:
self.values.append(('Status',
'Acquired, possibly with no waiters'))
if self.lock & FUTEX_OWNER_DIED:
self.values.append(('Owner ID', '%d (dead)' % self.owner))
else:
self.values.append(('Owner ID', self.lock & FUTEX_TID_MASK))
if self.owner == PTHREAD_MUTEX_INCONSISTENT:
self.values.append(('State protected by this mutex',
'Inconsistent'))
elif self.owner == PTHREAD_MUTEX_NOTRECOVERABLE:
self.values.append(('State protected by this mutex',
'Not recoverable'))
def read_status_no_robust(self):
"""Read the status of a non-robust mutex.
Read info on whether the mutex is acquired, if it may have waiters
and its owner (if any).
"""
lock_value = self.lock
if self.kind & PTHREAD_MUTEX_PRIO_PROTECT_NP:
lock_value &= ~(PTHREAD_MUTEX_PRIO_CEILING_MASK)
if lock_value == PTHREAD_MUTEX_UNLOCKED:
self.values.append(('Status', 'Not acquired'))
else:
if self.kind & PTHREAD_MUTEX_PRIO_INHERIT_NP:
waiters = self.lock & FUTEX_WAITERS
owner = self.lock & FUTEX_TID_MASK
else:
# Mutex protocol is PP or none
waiters = (self.lock != PTHREAD_MUTEX_LOCKED_NO_WAITERS)
owner = self.owner
if waiters:
self.values.append(('Status',
'Acquired, possibly with waiters'))
else:
self.values.append(('Status',
'Acquired, possibly with no waiters'))
if self.owner != 0:
self.values.append(('Owner ID', owner))
else:
# Owner isn't recorded, probably because lock elision
# is enabled.
self.values.append(('Owner ID', 'Unknown'))
def read_attributes(self):
"""Read the mutex's attributes."""
if self.kind != PTHREAD_MUTEX_DESTROYED:
if self.kind & PTHREAD_MUTEX_ROBUST_NORMAL_NP:
self.values.append(('Robust', 'Yes'))
else:
self.values.append(('Robust', 'No'))
# In glibc, robust mutexes always have their pshared flag set to
# 'shared' regardless of what the pshared flag of their
# mutexattr was. Therefore a robust mutex will act as shared
# even if it was initialized with a 'private' mutexattr.
if self.kind & PTHREAD_MUTEX_PSHARED_BIT:
self.values.append(('Shared', 'Yes'))
else:
self.values.append(('Shared', 'No'))
if self.kind & PTHREAD_MUTEX_PRIO_INHERIT_NP:
self.values.append(('Protocol', 'Priority inherit'))
elif self.kind & PTHREAD_MUTEX_PRIO_PROTECT_NP:
prio_ceiling = ((self.lock & PTHREAD_MUTEX_PRIO_CEILING_MASK)
>> PTHREAD_MUTEX_PRIO_CEILING_SHIFT)
self.values.append(('Protocol', 'Priority protect'))
self.values.append(('Priority ceiling', prio_ceiling))
else:
# PTHREAD_PRIO_NONE
self.values.append(('Protocol', 'None'))
def read_misc_info(self):
"""Read miscellaneous info on the mutex.
For now this reads the number of times a recursive mutex was acquired
by the same thread.
"""
mutex_type = self.kind & PTHREAD_MUTEX_KIND_MASK
if mutex_type == PTHREAD_MUTEX_RECURSIVE and self.count > 1:
self.values.append(('Times acquired by the owner', self.count))
class MutexAttributesPrinter(object):
"""Pretty printer for pthread_mutexattr_t.
In the NPTL this is a type that's always casted to struct pthread_mutexattr
which has a single 'mutexkind' field containing the actual attributes.
"""
def __init__(self, mutexattr):
"""Initialize the printer's internal data structures.
Args:
mutexattr: A gdb.value representing a pthread_mutexattr_t.
"""
self.values = []
try:
mutexattr_struct = gdb.lookup_type('struct pthread_mutexattr')
self.mutexattr = mutexattr.cast(mutexattr_struct)['mutexkind']
self.read_values()
except gdb.error:
# libpthread doesn't have debug symbols, thus we can't find the
# real struct type. Just print the union members.
self.values.append(('__size', mutexattr['__size']))
self.values.append(('__align', mutexattr['__align']))
def to_string(self):
"""gdb API function.
This is called from gdb when we try to print a pthread_mutexattr_t.
"""
return 'pthread_mutexattr_t'
def children(self):
"""gdb API function.
This is called from gdb when we try to print a pthread_mutexattr_t.
"""
return self.values
def read_values(self):
"""Read the mutexattr's info and store it in self.values.
The data contained in self.values will be returned by the Iterator
created in self.children.
"""
mutexattr_type = (self.mutexattr
& ~PTHREAD_MUTEXATTR_FLAG_BITS
& ~PTHREAD_MUTEX_NO_ELISION_NP)
# mutexattr_type must be casted to int because it's a gdb.Value
self.values.append(MUTEX_TYPES[int(mutexattr_type)])
if self.mutexattr & PTHREAD_MUTEXATTR_FLAG_ROBUST:
self.values.append(('Robust', 'Yes'))
else:
self.values.append(('Robust', 'No'))
if self.mutexattr & PTHREAD_MUTEXATTR_FLAG_PSHARED:
self.values.append(('Shared', 'Yes'))
else:
self.values.append(('Shared', 'No'))
protocol = ((self.mutexattr & PTHREAD_MUTEXATTR_PROTOCOL_MASK) >>
PTHREAD_MUTEXATTR_PROTOCOL_SHIFT)
if protocol == PTHREAD_PRIO_NONE:
self.values.append(('Protocol', 'None'))
elif protocol == PTHREAD_PRIO_INHERIT:
self.values.append(('Protocol', 'Priority inherit'))
elif protocol == PTHREAD_PRIO_PROTECT:
self.values.append(('Protocol', 'Priority protect'))
class ConditionVariablePrinter(object):
"""Pretty printer for pthread_cond_t."""
def __init__(self, cond):
"""Initialize the printer's internal data structures.
Args:
cond: A gdb.value representing a pthread_cond_t.
"""
data = cond['__data']
self.wrefs = data['__wrefs']
self.values = []
self.read_values()
def to_string(self):
"""gdb API function.
This is called from gdb when we try to print a pthread_cond_t.
"""
return 'pthread_cond_t'
def children(self):
"""gdb API function.
This is called from gdb when we try to print a pthread_cond_t.
"""
return self.values
def read_values(self):
"""Read the condvar's info and store it in self.values.
The data contained in self.values will be returned by the Iterator
created in self.children.
"""
self.read_status()
self.read_attributes()
def read_status(self):
"""Read the status of the condvar.
This method reads whether the condvar is destroyed and how many threads
are waiting for it.
"""
self.values.append(('Threads known to still execute a wait function',
self.wrefs >> PTHREAD_COND_WREFS_SHIFT))
def read_attributes(self):
"""Read the condvar's attributes."""
if (self.wrefs & PTHREAD_COND_CLOCK_MONOTONIC_MASK) != 0:
self.values.append(('Clock ID', 'CLOCK_MONOTONIC'))
else:
self.values.append(('Clock ID', 'CLOCK_REALTIME'))
if (self.wrefs & PTHREAD_COND_SHARED_MASK) != 0:
self.values.append(('Shared', 'Yes'))
else:
self.values.append(('Shared', 'No'))
class ConditionVariableAttributesPrinter(object):
"""Pretty printer for pthread_condattr_t.
In the NPTL this is a type that's always casted to struct pthread_condattr,
which has a single 'value' field containing the actual attributes.
"""
def __init__(self, condattr):
"""Initialize the printer's internal data structures.
Args:
condattr: A gdb.value representing a pthread_condattr_t.
"""
self.values = []
try:
condattr_struct = gdb.lookup_type('struct pthread_condattr')
self.condattr = condattr.cast(condattr_struct)['value']
self.read_values()
except gdb.error:
# libpthread doesn't have debug symbols, thus we can't find the
# real struct type. Just print the union members.
self.values.append(('__size', condattr['__size']))
self.values.append(('__align', condattr['__align']))
def to_string(self):
"""gdb API function.
This is called from gdb when we try to print a pthread_condattr_t.
"""
return 'pthread_condattr_t'
def children(self):
"""gdb API function.
This is called from gdb when we try to print a pthread_condattr_t.
"""
return self.values
def read_values(self):
"""Read the condattr's info and store it in self.values.
The data contained in self.values will be returned by the Iterator
created in self.children.
"""
clock_id = (self.condattr >> 1) & ((1 << COND_CLOCK_BITS) - 1)
if clock_id != 0:
self.values.append(('Clock ID', 'CLOCK_MONOTONIC'))
else:
self.values.append(('Clock ID', 'CLOCK_REALTIME'))
if self.condattr & 1:
self.values.append(('Shared', 'Yes'))
else:
self.values.append(('Shared', 'No'))
class RWLockPrinter(object):
"""Pretty printer for pthread_rwlock_t."""
def __init__(self, rwlock):
"""Initialize the printer's internal data structures.
Args:
rwlock: A gdb.value representing a pthread_rwlock_t.
"""
data = rwlock['__data']
self.readers = data['__readers']
self.cur_writer = data['__cur_writer']
self.shared = data['__shared']
self.flags = data['__flags']
self.values = []
self.read_values()
def to_string(self):
"""gdb API function.
This is called from gdb when we try to print a pthread_rwlock_t.
"""
return 'pthread_rwlock_t'
def children(self):
"""gdb API function.
This is called from gdb when we try to print a pthread_rwlock_t.
"""
return self.values
def read_values(self):
"""Read the rwlock's info and store it in self.values.
The data contained in self.values will be returned by the Iterator
created in self.children.
"""
self.read_status()
self.read_attributes()
def read_status(self):
"""Read the status of the rwlock."""
if self.readers & PTHREAD_RWLOCK_WRPHASE:
if self.readers & PTHREAD_RWLOCK_WRLOCKED:
self.values.append(('Status', 'Acquired (Write)'))
self.values.append(('Writer ID', self.cur_writer))
else:
self.values.append(('Status', 'Not acquired'))
else:
r = self.readers >> PTHREAD_RWLOCK_READER_SHIFT
if r > 0:
self.values.append(('Status', 'Acquired (Read)'))
self.values.append(('Readers', r))
else:
self.values.append(('Status', 'Not acquired'))
def read_attributes(self):
"""Read the attributes of the rwlock."""
if self.shared:
self.values.append(('Shared', 'Yes'))
else:
self.values.append(('Shared', 'No'))
if self.flags == PTHREAD_RWLOCK_PREFER_READER_NP:
self.values.append(('Prefers', 'Readers'))
elif self.flags == PTHREAD_RWLOCK_PREFER_WRITER_NP:
self.values.append(('Prefers', 'Writers'))
else:
self.values.append(('Prefers', 'Writers no recursive readers'))
class RWLockAttributesPrinter(object):
"""Pretty printer for pthread_rwlockattr_t.
In the NPTL this is a type that's always casted to
struct pthread_rwlockattr, which has two fields ('lockkind' and 'pshared')
containing the actual attributes.
"""
def __init__(self, rwlockattr):
"""Initialize the printer's internal data structures.
Args:
rwlockattr: A gdb.value representing a pthread_rwlockattr_t.
"""
self.values = []
try:
rwlockattr_struct = gdb.lookup_type('struct pthread_rwlockattr')
self.rwlockattr = rwlockattr.cast(rwlockattr_struct)
self.read_values()
except gdb.error:
# libpthread doesn't have debug symbols, thus we can't find the
# real struct type. Just print the union members.
self.values.append(('__size', rwlockattr['__size']))
self.values.append(('__align', rwlockattr['__align']))
def to_string(self):
"""gdb API function.
This is called from gdb when we try to print a pthread_rwlockattr_t.
"""
return 'pthread_rwlockattr_t'
def children(self):
"""gdb API function.
This is called from gdb when we try to print a pthread_rwlockattr_t.
"""
return self.values
def read_values(self):
"""Read the rwlockattr's info and store it in self.values.
The data contained in self.values will be returned by the Iterator
created in self.children.
"""
rwlock_type = self.rwlockattr['lockkind']
shared = self.rwlockattr['pshared']
if shared == PTHREAD_PROCESS_SHARED:
self.values.append(('Shared', 'Yes'))
else:
# PTHREAD_PROCESS_PRIVATE
self.values.append(('Shared', 'No'))
if rwlock_type == PTHREAD_RWLOCK_PREFER_READER_NP:
self.values.append(('Prefers', 'Readers'))
elif rwlock_type == PTHREAD_RWLOCK_PREFER_WRITER_NP:
self.values.append(('Prefers', 'Writers'))
else:
self.values.append(('Prefers', 'Writers no recursive readers'))
def register(objfile):
"""Register the pretty printers within the given objfile."""
printer = gdb.printing.RegexpCollectionPrettyPrinter('glibc-pthread-locks')
printer.add_printer('pthread_mutex_t', r'^pthread_mutex_t$',
MutexPrinter)
printer.add_printer('pthread_mutexattr_t', r'^pthread_mutexattr_t$',
MutexAttributesPrinter)
printer.add_printer('pthread_cond_t', r'^pthread_cond_t$',
ConditionVariablePrinter)
printer.add_printer('pthread_condattr_t', r'^pthread_condattr_t$',
ConditionVariableAttributesPrinter)
printer.add_printer('pthread_rwlock_t', r'^pthread_rwlock_t$',
RWLockPrinter)
printer.add_printer('pthread_rwlockattr_t', r'^pthread_rwlockattr_t$',
RWLockAttributesPrinter)
if objfile == None:
objfile = gdb
gdb.printing.register_pretty_printer(objfile, printer)
register(gdb.current_objfile())
|