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Add pretty printers for the NPTL lock types

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This patch adds pretty printers for the following NPTL types:

- pthread_mutex_t
- pthread_mutexattr_t
- pthread_cond_t
- pthread_condattr_t
- pthread_rwlock_t
- pthread_rwlockattr_t

To load the pretty printers into your gdb session, do the following:

python
import sys
sys.path.insert(0, '/path/to/glibc/build/nptl/pretty-printers')
end

source /path/to/glibc/source/pretty-printers/nptl-printers.py

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.

The printers are architecture-independent, and were manually tested on both
the gdb CLI and Eclipse CDT.

In order to work, the printers need to know the values of various flags that
are scattered throughout pthread.h and pthreadP.h as enums and #defines. Since
replicating these constants in the printers file itself would create a
maintenance burden, I wrote a script called gen-py-const.awk that Makerules uses
to extract the constants. This script is pretty much the same as gen-as-const.awk,
except it doesn't cast the constant values to 'long' and is thorougly documented.
The constants need only to be enumerated in a .pysym file, which is then referenced
by a Make variable called gen-py-const-headers.

As for the install directory, I discussed this with Mike Frysinger and Siddhesh
Poyarekar, and we agreed that it can be handled in a separate patch, and it shouldn't
block merging of this one.

In addition, I've written a series of test cases for the pretty printers.
Each lock type (mutex, condvar and rwlock) has two test programs, one for itself
and other for its related 'attributes' object. Each test program in turn has a
PExpect-based Python script that drives gdb and compares its output to the
expected printer's. The tests run on the glibc host, which is assumed to have
both gdb and PExpect; if either is absent the tests will fail with code 77
(UNSUPPORTED). For cross-testing you should use cross-test-ssh.sh as test-wrapper.
I've tested the printers on both a native build and a cross build using a Beaglebone
Black, with the build system's filesystem shared with the board through NFS.

Finally, I've written a README that explains all this and more.

Hopefully this should be good to go in now. Thanks.

ChangeLog:

2016-07-04  Martin Galvan  <martin.galvan@tallertechnologies.com>

	* Makeconfig (build-hardcoded-path-in-tests): Set to 'yes' for shared builds
	if tests-need-hardcoded-path is defined.
	(all-subdirs): Add pretty-printers.
	* Makerules ($(py-const)): New rule.
	* Rules (others): Add $(py-const), if defined.
	* nptl/Makefile (gen-py-const-headers): Define.
	* nptl/nptl-printers.py: New file.
	* nptl/nptl_lock_constants.pysym: Likewise.
	* pretty-printers/Makefile: Likewise.
	* pretty-printers/README: Likewise.
	* pretty-printers/test-condvar-attributes.c: Likewise.
	* pretty-printers/test-condvar-attributes.p: Likewise.
	* pretty-printers/test-condvar-printer.c: Likewise.
	* pretty-printers/test-condvar-printer.py: Likewise.
	* pretty-printers/test-mutex-attributes.c: Likewise.
	* pretty-printers/test-mutex-attributes.py: Likewise.
	* pretty-printers/test-mutex-printer.c: Likewise.
	* pretty-printers/test-mutex-printer.py: Likewise.
	* pretty-printers/test-rwlock-attributes.c: Likewise.
	* pretty-printers/test-rwlock-attributes.py: Likewise.
	* pretty-printers/test-rwlock-printer.c: Likewise.
	* pretty-printers/test-rwlock-printer.py: Likewise.
	* pretty-printers/test_common.py: Likewise.
	* scripts/gen-py-const.awk: Likewise.
This commit is contained in:
Martin Galvan 2016-07-08 20:01:55 +05:30 committed by Siddhesh Poyarekar
parent 75a9e6a788
commit 62ce266b0b
24 changed files with 2438 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

27
ChangeLog
View file

@ -1,3 +1,30 @@
2016-07-08 Martin Galvan <martin.galvan@tallertechnologies.com>
* Makeconfig (build-hardcoded-path-in-tests): Set to 'yes'
for shared builds if tests-need-hardcoded-path is defined.
(all-subdirs): Add pretty-printers.
* Makerules ($(py-const)): New rule.
* Rules (others): Add $(py-const), if defined.
* nptl/Makefile (gen-py-const-headers): Define.
* nptl/nptl-printers.py: New file.
* nptl/nptl_lock_constants.pysym: Likewise.
* pretty-printers/Makefile: Likewise.
* pretty-printers/README: Likewise.
* pretty-printers/test-condvar-attributes.c: Likewise.
* pretty-printers/test-condvar-attributes.p: Likewise.
* pretty-printers/test-condvar-printer.c: Likewise.
* pretty-printers/test-condvar-printer.py: Likewise.
* pretty-printers/test-mutex-attributes.c: Likewise.
* pretty-printers/test-mutex-attributes.py: Likewise.
* pretty-printers/test-mutex-printer.c: Likewise.
* pretty-printers/test-mutex-printer.py: Likewise.
* pretty-printers/test-rwlock-attributes.c: Likewise.
* pretty-printers/test-rwlock-attributes.py: Likewise.
* pretty-printers/test-rwlock-printer.c: Likewise.
* pretty-printers/test-rwlock-printer.py: Likewise.
* pretty-printers/test_common.py: Likewise.
* scripts/gen-py-const.awk: Likewise.
2016-07-08 Chris Metcalf <cmetcalf@mellanox.com>
* sysdeps/unix/sysv/linux/tile/kernel-features.h

14
Makeconfig
View file

@ -472,6 +472,18 @@ else
+link-tests = $(+link-static-tests)
endif
endif
# Some modules may have test programs that must always link against the newly
# built libraries instead of the installed ones. Such modules must define
# tests-need-hardcoded-path in their Makefile before including Makerules.
# This will cause the test programs to be linked with -rpath instead of
# -rpath-link, and their dynamic linker will be set to the built ld.so.
ifeq (yes,$(build-shared))
ifdef tests-need-hardcoded-path
build-hardcoded-path-in-tests := yes
endif
endif
ifeq (yes,$(build-shared))
ifndef rtld-LDFLAGS
rtld-LDFLAGS = -Wl,-dynamic-linker=$(rtlddir)/$(rtld-installed-name)
@ -1097,7 +1109,7 @@ all-subdirs = csu assert ctype locale intl catgets math setjmp signal \
grp pwd posix io termios resource misc socket sysvipc gmon \
gnulib iconv iconvdata wctype manual shadow gshadow po argp \
crypt localedata timezone rt conform debug mathvec \
$(add-on-subdirs) dlfcn elf
$(add-on-subdirs) dlfcn elf pretty-printers
ifndef avoid-generated
# sysd-sorted itself will contain rules making the sysd-sorted target

46
Makerules
View file

@ -214,6 +214,52 @@ sed-remove-dotdot := -e 's@ *\([^ \/$$][^ \]*\)@ $$(..)\1@g' \
-e 's@^\([^ \/$$][^ \]*\)@$$(..)\1@g'
endif
ifdef gen-py-const-headers
# We'll use a static pattern rule to match .pysym files with their
# corresponding generated .py files.
# The generated .py files go in the submodule's dir in the glibc source dir.
py-const-files := $(patsubst %.pysym,%.py,$(gen-py-const-headers))
py-const-dir := $(objpfx)
py-const := $(addprefix $(py-const-dir),$(py-const-files))
py-const-script := $(..)scripts/gen-py-const.awk
# This is a hack we use to generate .py files with constants for Python
# pretty printers. It works the same way as gen-as-const.
# See scripts/gen-py-const.awk for details on how the awk | gcc mechanism
# works.
#
# $@.tmp and $@.tmp2 are temporary files we use to store the partial contents
# of the target file. We do this instead of just writing on $@ because, if the
# build process terminates prematurely, re-running Make wouldn't run this rule
# since Make would see that the target file already exists (despite it being
# incomplete).
#
# The sed line replaces "@name@SOME_NAME@value@SOME_VALUE@" strings from the
# output of 'gcc -S' with "SOME_NAME = SOME_VALUE" strings.
# The '-n' option, combined with the '/p' command, makes sed output only the
# modified lines instead of the whole input file. The output is redirected
# to a .py file; we'll import it in the pretty printers file to read
# the constants generated by gen-py-const.awk.
# The regex has two capturing groups, for SOME_NAME and SOME_VALUE
# respectively. Notice SOME_VALUE may be prepended by a special character,
# depending on the assembly syntax (e.g. immediates are prefixed by a '$'
# in AT&T x86, and by a '#' in ARM). We discard it using a complemented set
# before the second capturing group.
$(py-const): $(py-const-dir)%.py: %.pysym $(py-const-script) \
$(common-before-compile)
$(make-target-directory)
$(AWK) -f $(py-const-script) $< \
| $(CC) -S -o $@.tmp $(CFLAGS) $(CPPFLAGS) -x c -
echo '# GENERATED FILE\n' > $@.tmp2
echo '# Constant definitions for pretty printers.' >> $@.tmp2
echo '# See gen-py-const.awk for details.\n' >> $@.tmp2
sed -n -r 's/^.*@name@([^@]+)@value@[^[:xdigit:]Xx-]*([[:xdigit:]Xx-]+)@.*/\1 = \2/p' \
$@.tmp >> $@.tmp2
mv -f $@.tmp2 $@
rm -f $@.tmp
generated += $(py-const)
endif # gen-py-const-headers
ifdef gen-as-const-headers
# Generating headers for assembly constants.

3
NEWS
View file

@ -47,6 +47,9 @@ Version 2.24
direction of negative infinity. These are currently enabled as GNU
extensions.
* Initial support is added for pretty printing of pthread variables in gdb.
See pretty-printers/README for details on how to use it.
Security related changes:
* An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It

5
Rules
View file

@ -98,6 +98,11 @@ tests: $(tests:%=$(objpfx)%.out) $(tests-special)
xtests: tests $(xtests:%=$(objpfx)%.out) $(xtests-special)
endif
# Generate constant files for Python pretty printers if required.
ifdef py-const
others: $(py-const)
endif
tests-special-notdir = $(patsubst $(objpfx)%, %, $(tests-special))
xtests-special-notdir = $(patsubst $(objpfx)%, %, $(xtests-special))
tests:

1
nptl/Makefile
View file

@ -307,6 +307,7 @@ gen-as-const-headers = pthread-errnos.sym \
unwindbuf.sym \
lowlevelrobustlock.sym pthread-pi-defines.sym
gen-py-const-headers = nptl_lock_constants.pysym
LDFLAGS-pthread.so = -Wl,--enable-new-dtags,-z,nodelete,-z,initfirst

593
nptl/nptl-printers.py Normal file
View file

@ -0,0 +1,593 @@
# Pretty printers for the NPTL lock types.
#
# Copyright (C) 2016 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
from nptl_lock_constants import *
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.
For architectures which support lock elision, this method reads
whether the mutex appears as locked in memory (i.e. it may show it as
unlocked even after calling pthread_mutex_lock).
"""
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', 'Unlocked'))
else:
if self.lock & FUTEX_WAITERS:
self.values.append(('Status', 'Locked, possibly with waiters'))
else:
self.values.append(('Status',
'Locked, 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 locked, 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', 'Unlocked'))
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', 'Locked, possibly with waiters'))
else:
self.values.append(('Status',
'Locked, possibly with no waiters'))
self.values.append(('Owner ID', owner))
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 locked
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 locked recursively', 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.
"""
mutexattr_struct = gdb.lookup_type('struct pthread_mutexattr')
self.mutexattr = mutexattr.cast(mutexattr_struct)['mutexkind']
self.values = []
self.read_values()
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'))
CLOCK_IDS = {
CLOCK_REALTIME: 'CLOCK_REALTIME',
CLOCK_MONOTONIC: 'CLOCK_MONOTONIC',
CLOCK_PROCESS_CPUTIME_ID: 'CLOCK_PROCESS_CPUTIME_ID',
CLOCK_THREAD_CPUTIME_ID: 'CLOCK_THREAD_CPUTIME_ID',
CLOCK_MONOTONIC_RAW: 'CLOCK_MONOTONIC_RAW',
CLOCK_REALTIME_COARSE: 'CLOCK_REALTIME_COARSE',
CLOCK_MONOTONIC_COARSE: 'CLOCK_MONOTONIC_COARSE'
}
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.total_seq = data['__total_seq']
self.mutex = data['__mutex']
self.nwaiters = data['__nwaiters']
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()
self.read_mutex_info()
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.
"""
if self.total_seq == PTHREAD_COND_DESTROYED:
self.values.append(('Status', 'Destroyed'))
self.values.append(('Threads waiting for this condvar',
self.nwaiters >> COND_NWAITERS_SHIFT))
def read_attributes(self):
"""Read the condvar's attributes."""
clock_id = self.nwaiters & ((1 << COND_NWAITERS_SHIFT) - 1)
# clock_id must be casted to int because it's a gdb.Value
self.values.append(('Clock ID', CLOCK_IDS[int(clock_id)]))
shared = (self.mutex == PTHREAD_COND_SHARED)
if shared:
self.values.append(('Shared', 'Yes'))
else:
self.values.append(('Shared', 'No'))
def read_mutex_info(self):
"""Read the data of the mutex this condvar is bound to.
A pthread_cond_t's __data.__mutex member is a void * which
must be casted to pthread_mutex_t *. For shared condvars, this
member isn't recorded and has a value of ~0l instead.
"""
if self.mutex and self.mutex != PTHREAD_COND_SHARED:
mutex_type = gdb.lookup_type('pthread_mutex_t')
mutex = self.mutex.cast(mutex_type.pointer()).dereference()
self.values.append(('Mutex', mutex))
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.
"""
condattr_struct = gdb.lookup_type('struct pthread_condattr')
self.condattr = condattr.cast(condattr_struct)['value']
self.values = []
self.read_values()
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 << COND_NWAITERS_SHIFT) - 1)
# clock_id must be casted to int because it's a gdb.Value
self.values.append(('Clock ID', CLOCK_IDS[int(clock_id)]))
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['__nr_readers']
self.queued_readers = data['__nr_readers_queued']
self.queued_writers = data['__nr_writers_queued']
self.writer_id = data['__writer']
self.shared = data['__shared']
self.prefers_writers = 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."""
# Right now pthread_rwlock_destroy doesn't do anything, so there's no
# way to check if an rwlock is destroyed.
if self.writer_id:
self.values.append(('Status', 'Locked (Write)'))
self.values.append(('Writer ID', self.writer_id))
elif self.readers:
self.values.append(('Status', 'Locked (Read)'))
self.values.append(('Readers', self.readers))
else:
self.values.append(('Status', 'Unlocked'))
self.values.append(('Queued readers', self.queued_readers))
self.values.append(('Queued writers', self.queued_writers))
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.prefers_writers:
self.values.append(('Prefers', 'Writers'))
else:
self.values.append(('Prefers', '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.
"""
rwlockattr_struct = gdb.lookup_type('struct pthread_rwlockattr')
self.rwlockattr = rwlockattr.cast(rwlockattr_struct)
self.values = []
self.read_values()
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 or
rwlock_type == PTHREAD_RWLOCK_PREFER_WRITER_NP):
# This is a known bug. Using PTHREAD_RWLOCK_PREFER_WRITER_NP will
# still make the rwlock prefer readers.
self.values.append(('Prefers', 'Readers'))
elif rwlock_type == PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP:
self.values.append(('Prefers', 'Writers'))
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)
gdb.printing.register_pretty_printer(objfile, printer)
register(gdb.current_objfile())

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#include <pthreadP.h>
-- Mutex types
PTHREAD_MUTEX_KIND_MASK PTHREAD_MUTEX_KIND_MASK_NP
PTHREAD_MUTEX_NORMAL
PTHREAD_MUTEX_RECURSIVE PTHREAD_MUTEX_RECURSIVE_NP
PTHREAD_MUTEX_ERRORCHECK PTHREAD_MUTEX_ERRORCHECK_NP
PTHREAD_MUTEX_ADAPTIVE_NP
-- Mutex status
-- These are hardcoded all over the code; there are no enums/macros for them.
PTHREAD_MUTEX_DESTROYED -1
PTHREAD_MUTEX_UNLOCKED 0
PTHREAD_MUTEX_LOCKED_NO_WAITERS 1
-- For robust mutexes
PTHREAD_MUTEX_INCONSISTENT
PTHREAD_MUTEX_NOTRECOVERABLE
FUTEX_OWNER_DIED
-- For robust and PI mutexes
FUTEX_WAITERS
FUTEX_TID_MASK
-- Mutex attributes
PTHREAD_MUTEX_ROBUST_NORMAL_NP
PTHREAD_MUTEX_PRIO_INHERIT_NP
PTHREAD_MUTEX_PRIO_PROTECT_NP
PTHREAD_MUTEX_PSHARED_BIT
PTHREAD_MUTEX_PRIO_CEILING_SHIFT
PTHREAD_MUTEX_PRIO_CEILING_MASK
-- Mutex attribute flags
PTHREAD_MUTEXATTR_PROTOCOL_SHIFT
PTHREAD_MUTEXATTR_PROTOCOL_MASK
PTHREAD_MUTEXATTR_PRIO_CEILING_MASK
PTHREAD_MUTEXATTR_FLAG_ROBUST
PTHREAD_MUTEXATTR_FLAG_PSHARED
PTHREAD_MUTEXATTR_FLAG_BITS
PTHREAD_MUTEX_NO_ELISION_NP
-- Priority protocols
PTHREAD_PRIO_NONE
PTHREAD_PRIO_INHERIT
PTHREAD_PRIO_PROTECT
-- These values are hardcoded as well:
-- Value of __mutex for shared condvars.
PTHREAD_COND_SHARED ~0l
-- Value of __total_seq for destroyed condvars.
PTHREAD_COND_DESTROYED -1ull
-- __nwaiters encodes the number of threads waiting on a condvar
-- and the clock ID.
-- __nwaiters >> COND_NWAITERS_SHIFT gives us the number of waiters.
COND_NWAITERS_SHIFT
-- Condvar clock IDs
CLOCK_REALTIME
CLOCK_MONOTONIC
CLOCK_PROCESS_CPUTIME_ID
CLOCK_THREAD_CPUTIME_ID
CLOCK_MONOTONIC_RAW
CLOCK_REALTIME_COARSE
CLOCK_MONOTONIC_COARSE
-- Rwlock attributes
PTHREAD_RWLOCK_PREFER_READER_NP
PTHREAD_RWLOCK_PREFER_WRITER_NP
PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP
-- 'Shared' attribute values
PTHREAD_PROCESS_PRIVATE
PTHREAD_PROCESS_SHARED

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# Makefile for the Python pretty printers.
#
# Copyright (C) 2016 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 contains rules for building and running the pretty printer tests.
subdir := pretty-printers
tests-need-hardcoded-path := yes
include ../Makeconfig
PYTHON := python
tests-pretty-printers := test-mutex-attributes test-mutex-printer \
test-condvar-attributes test-condvar-printer \
test-rwlock-attributes test-rwlock-printer
# Add the test programs to test-srcs so that they'll be compiled regardless
# of whether we should actually run them.
test-srcs := $(tests-pretty-printers)
ifeq ($(build-shared),yes)
nptl-tests-libs := $(shared-thread-library)
else
nptl-tests-libs := $(static-thread-library)
endif
# The test programs need to be compiled without optimizations so they won't
# confuse gdb. We could use either the 'GCC optimize' pragma or the 'optimize'
# function attribute to achieve this; however, at least on ARM, gcc always
# produces different debugging symbols when invoked with a -O greater than 0
# than when invoked with -O0, regardless of anything else we're using
# to suppress optimizations. Therefore, we need to explicitly pass -O0 to it
# through CFLAGS.
# Additionally, the build system will try to -include $(common-objpfx)/config.h
# when compiling the tests, which will throw an error if some special macros
# (such as __OPTIMIZE__ and IS_IN_BUILD) aren't defined. To avoid this, we
# tell gcc to define IS_IN_build.
CFLAGS-test-mutex-attributes.c := -O0 -ggdb3 -DIS_IN_build
CFLAGS-test-mutex-printer.c := -O0 -ggdb3 -DIS_IN_build
CFLAGS-test-condvar-attributes.c := -O0 -ggdb3 -DIS_IN_build
CFLAGS-test-condvar-printer.c := -O0 -ggdb3 -DIS_IN_build
CFLAGS-test-rwlock-attributes.c := -O0 -ggdb3 -DIS_IN_build
CFLAGS-test-rwlock-printer.c := -O0 -ggdb3 -DIS_IN_build
tests-pretty-printers-dest := $(addprefix $(objpfx),$(tests-pretty-printers))
tests-pretty-printers-pp := $(addsuffix -pp,$(tests-pretty-printers-dest))
ifeq ($(run-built-tests),yes)
tests-special += $(tests-pretty-printers-pp)
endif
include ../Rules
# Add the thread libraries to the prerequisites of the NPTL test programs.
$(tests-pretty-printers-dest): $(nptl-tests-libs)
# We won't actually create any *-pp files, so we mark this target as PHONY
# to ensure it always runs when required.
.PHONY: $(tests-pretty-printers-pp)
# Static pattern rule that matches the test-* targets to their .c and .py
# prerequisites. It'll run the corresponding test script for each test program
# we compiled. test_common.py must be present for all.
$(tests-pretty-printers-pp): $(objpfx)%-pp: $(objpfx)% %.py test_common.py
$(test-wrapper-env) $(PYTHON) $*.py $*.c $(objpfx)$*; \
$(evaluate-test)

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README for the glibc Python pretty printers
-------------------------------------------
Pretty printers are gdb extensions that allow it to print useful, human-readable
information about a program's variables. For example, for a pthread_mutex_t
gdb would usually output something like this:
(gdb) print mutex
$1 = {
__data = {
__lock = 22020096,
__count = 0,
__owner = 0,
__nusers = 0,
__kind = 576,
__spins = 0,
__elision = 0,
__list = {
__prev = 0x0,
__next = 0x0
}
},
__size = "\000\000P\001", '\000' <repeats 12 times>, "@\002", '\000' <repeats 21 times>,
__align = 22020096
}
However, with a pretty printer gdb will output something like this:
(gdb) print mutex
$1 = pthread_mutex_t = {
Type = Normal,
Status = Unlocked,
Robust = No,
Shared = No,
Protocol = Priority protect,
Priority ceiling = 42
}
Before printing a value, gdb will first check if there's a pretty printer
registered for it. If there is, it'll use it, otherwise it'll print the value
as usual. Pretty printers can be registered in various ways; for our purposes
we register them for the current objfile by calling
gdb.printing.register_pretty_printer().
Currently our printers are based on gdb.RegexpCollectionPrettyPrinter, which
means they'll be triggered if the type of the variable we're printing matches
a given regular expression. For example, MutexPrinter will be triggered if
our variable's type matches the regexp '^pthread_mutex_t$'.
Besides the printers themselves, each module may have a constants file which the
printers will import. These constants are generated from C headers during the
build process, and need to be in the Python search path when loading the
printers.
Installing and loading
----------------------
The pretty printers and their constant files may be installed in different paths
for each distro, though gdb should be able to automatically load them by itself.
When in doubt, you can use the 'info pretty printer' gdb command to list the
loaded pretty printers.
If the printers aren't automatically loaded for some reason, you should add the
following to your .gdbinit:
python
import sys
sys.path.insert(0, '/path/to/constants/file/directory')
end
source /path/to/printers.py
If you're building glibc manually, '/path/to/constants/file/directory' should be
'/path/to/glibc-build/submodule', where 'submodule' is e.g. nptl.
Testing
-------
The pretty printers come with a small test suite based on PExpect, which is a
Python module with Expect-like features for spawning and controlling interactive
programs. Each printer has a corresponding C program and a Python script
that uses PExpect to drive gdb through the program and compare its output to
the expected printer's.
The tests run on the glibc host, which is assumed to have both gdb and PExpect;
if any of those is absent the tests will fail with code 77 (UNSUPPORTED).
Native builds can be tested simply by doing 'make check'; cross builds must use
cross-test-ssh.sh as test-wrapper, like this:
make test-wrapper='/path/to/scripts/cross-test-ssh.sh user@host' check
(Remember to share the build system's filesystem with the glibc host's through
NFS or something similar).
Running 'make check' on a cross build will only compile the test programs,
without running the scripts.
Known issues
------------
* Pretty printers are inherently coupled to the code they're targetting, thus
any changes to the target code must also update the corresponding printers.
On the plus side, the printer code itself may serve as a kind of documentation
for the target code.
* Older versions of the gdb Python API have a bug where
gdb.RegexpCollectionPrettyPrinter would not be able to get a value's real type
if it was typedef'd. This would cause gdb to ignore the pretty printers for
types like pthread_mutex_t, which is defined as:
typedef union
{
...
} pthread_mutex_t;
This was fixed in commit 1b588015839caafc608a6944a78aea170f5fb2f6. However,
typedef'ing an already typedef'd type may cause a similar issue, e.g.:
typedef pthread_mutex_t mutex;
mutex a_mutex;
Here, trying to print a_mutex won't trigger the pthread_mutex_t printer.
* The test programs must be compiled without optimizations. This is necessary
because the test scripts rely on the C code structure being preserved when
stepping through the programs. Things like aggressive instruction reordering
or optimizing variables out may make this kind of testing impossible.

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/* Helper program for testing the pthread_cond_t and pthread_condattr_t
pretty printers.
Copyright (C) 2016 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/>. */
/* Keep the calls to the pthread_* functions on separate lines to make it easy
to advance through the program using the gdb 'next' command. */
#include <time.h>
#include <pthread.h>
#define PASS 0
#define FAIL 1
static int condvar_reinit (pthread_cond_t *condvar,
const pthread_condattr_t *attr);
static int test_setclock (pthread_cond_t *condvar, pthread_condattr_t *attr);
static int test_setpshared (pthread_cond_t *condvar, pthread_condattr_t *attr);
/* Need these so we don't have lines longer than 79 chars. */
#define SET_SHARED(attr, shared) pthread_condattr_setpshared (attr, shared)
int
main (void)
{
pthread_cond_t condvar;
pthread_condattr_t attr;
int result = FAIL;
if (pthread_condattr_init (&attr) == 0
&& pthread_cond_init (&condvar, NULL) == 0
&& test_setclock (&condvar, &attr) == PASS
&& test_setpshared (&condvar, &attr) == PASS)
result = PASS;
/* Else, one of the pthread_cond* functions failed. */
return result;
}
/* Destroys CONDVAR and re-initializes it using ATTR. */
static int
condvar_reinit (pthread_cond_t *condvar, const pthread_condattr_t *attr)
{
int result = FAIL;
if (pthread_cond_destroy (condvar) == 0
&& pthread_cond_init (condvar, attr) == 0)
result = PASS;
return result;
}
/* Tests setting the clock ID attribute. */
static int
test_setclock (pthread_cond_t *condvar, pthread_condattr_t *attr)
{
int result = FAIL;
if (pthread_condattr_setclock (attr, CLOCK_REALTIME) == 0 /* Set clock. */
&& condvar_reinit (condvar, attr) == PASS)
result = PASS;
return result;
}
/* Tests setting whether the condvar can be shared between processes. */
static int
test_setpshared (pthread_cond_t *condvar, pthread_condattr_t *attr)
{
int result = FAIL;
if (SET_SHARED (attr, PTHREAD_PROCESS_SHARED) == 0 /* Set shared. */
&& condvar_reinit (condvar, attr) == PASS
&& SET_SHARED (attr, PTHREAD_PROCESS_PRIVATE) == 0
&& condvar_reinit (condvar, attr) == PASS)
result = PASS;
return result;
}

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# Common tests for the ConditionVariablePrinter and
# ConditionVariableAttributesPrinter classes.
#
# Copyright (C) 2016 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/>.
import sys
from test_common import *
test_source = sys.argv[1]
test_bin = sys.argv[2]
result = PASS
try:
init_test(test_bin)
go_to_main()
condvar_var = 'condvar'
condvar_to_string = 'pthread_cond_t'
attr_var = 'attr'
attr_to_string = 'pthread_condattr_t'
break_at(test_source, 'Set clock')
continue_cmd() # Go to test_setclock
next_cmd(2)
test_printer(condvar_var, condvar_to_string, {'Clock ID': 'CLOCK_REALTIME'})
test_printer(attr_var, attr_to_string, {'Clock ID': 'CLOCK_REALTIME'})
break_at(test_source, 'Set shared')
continue_cmd() # Go to test_setpshared
next_cmd(2)
test_printer(condvar_var, condvar_to_string, {'Shared': 'Yes'})
test_printer(attr_var, attr_to_string, {'Shared': 'Yes'})
next_cmd(2)
test_printer(condvar_var, condvar_to_string, {'Shared': 'No'})
test_printer(attr_var, attr_to_string, {'Shared': 'No'})
continue_cmd() # Exit
except (NoLineError, pexpect.TIMEOUT) as exception:
print('Error: {0}'.format(exception))
result = FAIL
exit(result)

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/* Helper program for testing the pthread_cond_t pretty printer.
Copyright (C) 2016 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/>. */
/* Keep the calls to the pthread_* functions on separate lines to make it easy
to advance through the program using the gdb 'next' command. */
#include <time.h>
#include <pthread.h>
#define PASS 0
#define FAIL 1
static int test_status_destroyed (pthread_cond_t *condvar);
int
main (void)
{
pthread_cond_t condvar;
pthread_condattr_t attr;
int result = FAIL;
if (pthread_condattr_init (&attr) == 0
&& test_status_destroyed (&condvar) == PASS)
result = PASS;
/* Else, one of the pthread_cond* functions failed. */
return result;
}
/* Initializes CONDVAR, then destroys it. */
static int
test_status_destroyed (pthread_cond_t *condvar)
{
int result = FAIL;
if (pthread_cond_init (condvar, NULL) == 0
&& pthread_cond_destroy (condvar) == 0)
result = PASS; /* Test status (destroyed). */
return result;
}

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# Common tests for the ConditionVariablePrinter class.
#
# Copyright (C) 2016 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/>.
import sys
from test_common import *
test_source = sys.argv[1]
test_bin = sys.argv[2]
result = PASS
try:
init_test(test_bin)
go_to_main()
var = 'condvar'
to_string = 'pthread_cond_t'
break_at(test_source, 'Test status (destroyed)')
continue_cmd() # Go to test_status_destroyed
test_printer(var, to_string, {'Status': 'Destroyed'})
continue_cmd() # Exit
except (NoLineError, pexpect.TIMEOUT) as exception:
print('Error: {0}'.format(exception))
result = FAIL
exit(result)

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/* Helper program for testing the pthread_mutex_t and pthread_mutexattr_t
pretty printers.
Copyright (C) 2016 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/>. */
/* Keep the calls to the pthread_* functions on separate lines to make it easy
to advance through the program using the gdb 'next' command. */
#include <pthread.h>
#define PASS 0
#define FAIL 1
#define PRIOCEILING 42
/* Need these so we don't have lines longer than 79 chars. */
#define SET_TYPE(attr, type) pthread_mutexattr_settype (attr, type)
#define SET_ROBUST(attr, robust) pthread_mutexattr_setrobust (attr, robust)
#define SET_SHARED(attr, shared) pthread_mutexattr_setpshared (attr, shared)
#define SET_PROTOCOL(attr, protocol) \
pthread_mutexattr_setprotocol (attr, protocol)
#define SET_PRIOCEILING(mutex, prioceiling, old_ceiling) \
pthread_mutex_setprioceiling (mutex, prioceiling, old_ceiling)
static int mutex_reinit (pthread_mutex_t *mutex,
const pthread_mutexattr_t *attr);
static int test_settype (pthread_mutex_t *mutex, pthread_mutexattr_t *attr);
static int test_setrobust (pthread_mutex_t *mutex, pthread_mutexattr_t *attr);
static int test_setpshared (pthread_mutex_t *mutex, pthread_mutexattr_t *attr);
static int test_setprotocol (pthread_mutex_t *mutex,
pthread_mutexattr_t *attr);
int
main (void)
{
pthread_mutex_t mutex;
pthread_mutexattr_t attr;
int result = FAIL;
if (pthread_mutexattr_init (&attr) == 0
&& pthread_mutex_init (&mutex, NULL) == 0
&& test_settype (&mutex, &attr) == PASS
&& test_setrobust (&mutex, &attr) == PASS
&& test_setpshared (&mutex, &attr) == PASS
&& test_setprotocol (&mutex, &attr) == PASS)
result = PASS;
/* Else, one of the pthread_mutex* functions failed. */
return result;
}
/* Destroys MUTEX and re-initializes it using ATTR. */
static int
mutex_reinit (pthread_mutex_t *mutex, const pthread_mutexattr_t *attr)
{
int result = FAIL;
if (pthread_mutex_destroy (mutex) == 0
&& pthread_mutex_init (mutex, attr) == 0)
result = PASS;
return result;
}
/* Tests setting the mutex type. */
static int
test_settype (pthread_mutex_t *mutex, pthread_mutexattr_t *attr)
{
int result = FAIL;
if (SET_TYPE (attr, PTHREAD_MUTEX_ERRORCHECK) == 0 /* Set type. */
&& mutex_reinit (mutex, attr) == 0
&& SET_TYPE (attr, PTHREAD_MUTEX_RECURSIVE) == 0
&& mutex_reinit (mutex, attr) == 0
&& SET_TYPE (attr, PTHREAD_MUTEX_NORMAL) == 0
&& mutex_reinit (mutex, attr) == 0)
result = PASS;
return result;
}
/* Tests setting whether the mutex is robust. */
static int
test_setrobust (pthread_mutex_t *mutex, pthread_mutexattr_t *attr)
{
int result = FAIL;
if (SET_ROBUST (attr, PTHREAD_MUTEX_ROBUST) == 0 /* Set robust. */
&& mutex_reinit (mutex, attr) == 0
&& SET_ROBUST (attr, PTHREAD_MUTEX_STALLED) == 0
&& mutex_reinit (mutex, attr) == 0)
result = PASS;
return result;
}
/* Tests setting whether the mutex can be shared between processes. */
static int
test_setpshared (pthread_mutex_t *mutex, pthread_mutexattr_t *attr)
{
int result = FAIL;
if (SET_SHARED (attr, PTHREAD_PROCESS_SHARED) == 0 /* Set shared. */
&& mutex_reinit (mutex, attr) == 0
&& SET_SHARED (attr, PTHREAD_PROCESS_PRIVATE) == 0
&& mutex_reinit (mutex, attr) == 0)
result = PASS;
return result;
}
/* Tests setting the mutex protocol and, for Priority Protect, the Priority
Ceiling. */
static int
test_setprotocol (pthread_mutex_t *mutex, pthread_mutexattr_t *attr)
{
int result = FAIL;
int old_prioceiling;
if (SET_PROTOCOL (attr, PTHREAD_PRIO_INHERIT) == 0 /* Set protocol. */
&& mutex_reinit (mutex, attr) == 0
&& SET_PROTOCOL (attr, PTHREAD_PRIO_PROTECT) == 0
&& mutex_reinit (mutex, attr) == 0
&& SET_PRIOCEILING(mutex, PRIOCEILING, &old_prioceiling) == 0
&& SET_PROTOCOL (attr, PTHREAD_PRIO_NONE) == 0
&& mutex_reinit (mutex, attr) == 0)
result = PASS;
return result;
}

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# Common tests for the MutexPrinter and MutexAttributesPrinter classes.
#
# Copyright (C) 2016 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/>.
import sys
from test_common import *
test_source = sys.argv[1]
test_bin = sys.argv[2]
result = PASS
PRIOCEILING = 42
try:
init_test(test_bin)
go_to_main()
mutex_var = 'mutex'
mutex_to_string = 'pthread_mutex_t'
attr_var = 'attr'
attr_to_string = 'pthread_mutexattr_t'
break_at(test_source, 'Set type')
continue_cmd() # Go to test_settype
next_cmd(2)
test_printer(attr_var, attr_to_string, {'Type': 'Error check'})
test_printer(mutex_var, mutex_to_string, {'Type': 'Error check'})
next_cmd(2)
test_printer(attr_var, attr_to_string, {'Type': 'Recursive'})
test_printer(mutex_var, mutex_to_string, {'Type': 'Recursive'})
next_cmd(2)
test_printer(attr_var, attr_to_string, {'Type': 'Normal'})
test_printer(mutex_var, mutex_to_string, {'Type': 'Normal'})
break_at(test_source, 'Set robust')
continue_cmd() # Go to test_setrobust
next_cmd(2)
test_printer(attr_var, attr_to_string, {'Robust': 'Yes'})
test_printer(mutex_var, mutex_to_string, {'Robust': 'Yes'})
next_cmd(2)
test_printer(attr_var, attr_to_string, {'Robust': 'No'})
test_printer(mutex_var, mutex_to_string, {'Robust': 'No'})
break_at(test_source, 'Set shared')
continue_cmd() # Go to test_setpshared
next_cmd(2)
test_printer(attr_var, attr_to_string, {'Shared': 'Yes'})
test_printer(mutex_var, mutex_to_string, {'Shared': 'Yes'})
next_cmd(2)
test_printer(attr_var, attr_to_string, {'Shared': 'No'})
test_printer(mutex_var, mutex_to_string, {'Shared': 'No'})
break_at(test_source, 'Set protocol')
continue_cmd() # Go to test_setprotocol
next_cmd(2)
test_printer(attr_var, attr_to_string, {'Protocol': 'Priority inherit'})
test_printer(mutex_var, mutex_to_string, {'Protocol': 'Priority inherit'})
next_cmd(2)
test_printer(attr_var, attr_to_string, {'Protocol': 'Priority protect'})
test_printer(mutex_var, mutex_to_string, {'Protocol': 'Priority protect'})
next_cmd(2)
test_printer(mutex_var, mutex_to_string, {'Priority ceiling':
str(PRIOCEILING)})
next_cmd()
test_printer(attr_var, attr_to_string, {'Protocol': 'None'})
test_printer(mutex_var, mutex_to_string, {'Protocol': 'None'})
continue_cmd() # Exit
except (NoLineError, pexpect.TIMEOUT) as exception:
print('Error: {0}'.format(exception))
result = FAIL
exit(result)

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/* Helper program for testing the pthread_mutex_t pretty printer.
Copyright (C) 2016 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/>. */
/* Keep the calls to the pthread_* functions on separate lines to make it easy
to advance through the program using the gdb 'next' command. */
#include <stdlib.h>
#include <errno.h>
#include <pthread.h>
#define PASS 0
#define FAIL 1
static int test_status_destroyed (pthread_mutex_t *mutex);
static int test_status_no_robust (pthread_mutex_t *mutex,
pthread_mutexattr_t *attr);
static int test_status_robust (pthread_mutex_t *mutex,
pthread_mutexattr_t *attr);
static int test_locking_state_robust (pthread_mutex_t *mutex);
static void *thread_func (void *arg);
static int test_recursive_locks (pthread_mutex_t *mutex,
pthread_mutexattr_t *attr);
int
main (void)
{
pthread_mutex_t mutex;
pthread_mutexattr_t attr;
int result = FAIL;
if (pthread_mutexattr_init (&attr) == 0
&& test_status_destroyed (&mutex) == PASS
&& test_status_no_robust (&mutex, &attr) == PASS
&& test_status_robust (&mutex, &attr) == PASS
&& test_recursive_locks (&mutex, &attr) == PASS)
result = PASS;
/* Else, one of the pthread_mutex* functions failed. */
return result;
}
/* Initializes MUTEX, then destroys it. */
static int
test_status_destroyed (pthread_mutex_t *mutex)
{
int result = FAIL;
if (pthread_mutex_init (mutex, NULL) == 0
&& pthread_mutex_destroy (mutex) == 0)
result = PASS; /* Test status (destroyed). */
return result;
}
/* Tests locking of non-robust mutexes. */
static int
test_status_no_robust (pthread_mutex_t *mutex, pthread_mutexattr_t *attr)
{
int result = FAIL;
if (pthread_mutexattr_setrobust (attr, PTHREAD_MUTEX_STALLED) == 0
&& pthread_mutex_init (mutex, attr) == 0
&& pthread_mutex_lock (mutex) == 0 /* Test status (non-robust). */
&& pthread_mutex_unlock (mutex) == 0
&& pthread_mutex_destroy (mutex) == 0)
result = PASS;
return result;
}
/* Tests locking of robust mutexes. */
static int
test_status_robust (pthread_mutex_t *mutex, pthread_mutexattr_t *attr)
{
int result = FAIL;
if (pthread_mutexattr_setrobust (attr, PTHREAD_MUTEX_ROBUST) == 0
&& pthread_mutex_init (mutex, attr) == 0
&& test_locking_state_robust (mutex) == PASS /* Test status (robust). */
&& pthread_mutex_destroy (mutex) == 0)
result = PASS;
return result;
}
/* Tests locking and state corruption of robust mutexes. We'll mark it as
inconsistent, then not recoverable. */
static int
test_locking_state_robust (pthread_mutex_t *mutex)
{
int result = FAIL;
pthread_t thread;
if (pthread_create (&thread, NULL, thread_func, mutex) == 0 /* Create. */
&& pthread_join (thread, NULL) == 0
&& pthread_mutex_lock (mutex) == EOWNERDEAD /* Test locking (robust). */
&& pthread_mutex_unlock (mutex) == 0)
result = PASS;
return result;
}
/* Function to be called by the child thread when testing robust mutexes. */
static void *
thread_func (void *arg)
{
pthread_mutex_t *mutex = (pthread_mutex_t *)arg;
if (pthread_mutex_lock (mutex) != 0) /* Thread function. */
exit (FAIL);
/* Thread terminates without unlocking the mutex, thus marking it as
inconsistent. */
return NULL;
}
/* Tests locking the mutex multiple times in a row. */
static int
test_recursive_locks (pthread_mutex_t *mutex, pthread_mutexattr_t *attr)
{
int result = FAIL;
if (pthread_mutexattr_settype (attr, PTHREAD_MUTEX_RECURSIVE) == 0
&& pthread_mutex_init (mutex, attr) == 0
&& pthread_mutex_lock (mutex) == 0
&& pthread_mutex_lock (mutex) == 0
&& pthread_mutex_lock (mutex) == 0 /* Test recursive locks. */
&& pthread_mutex_unlock (mutex) == 0
&& pthread_mutex_unlock (mutex) == 0
&& pthread_mutex_unlock (mutex) == 0
&& pthread_mutex_destroy (mutex) == 0)
result = PASS;
return result;
}

92
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# Tests for the MutexPrinter class.
#
# Copyright (C) 2016 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/>.
import sys
from test_common import *
test_source = sys.argv[1]
test_bin = sys.argv[2]
result = PASS
try:
init_test(test_bin)
go_to_main()
var = 'mutex'
to_string = 'pthread_mutex_t'
break_at(test_source, 'Test status (destroyed)')
continue_cmd() # Go to test_status_destroyed
test_printer(var, to_string, {'Status': 'Destroyed'})
break_at(test_source, 'Test status (non-robust)')
continue_cmd() # Go to test_status_no_robust
test_printer(var, to_string, {'Status': 'Unlocked'})
next_cmd()
thread_id = get_current_thread_lwpid()
test_printer(var, to_string, {'Status': 'Locked, possibly with no waiters',
'Owner ID': thread_id})
break_at(test_source, 'Test status (robust)')
continue_cmd() # Go to test_status_robust
test_printer(var, to_string, {'Status': 'Unlocked'})
# We'll now test the robust mutex locking states. We'll create a new
# thread that will lock a robust mutex and exit without unlocking it.
break_at(test_source, 'Create')
continue_cmd() # Go to test_locking_state_robust
# Set a breakpoint for the new thread to hit.
break_at(test_source, 'Thread function')
continue_cmd()
# By now the new thread is created and has hit its breakpoint.
set_scheduler_locking(True)
parent = '1'
child = '2'
select_thread(child)
child_id = get_current_thread_lwpid()
# We've got the new thread's ID.
select_thread(parent)
# Make the new thread finish its function while we wait.
continue_cmd(thread=child)
# The new thread should be dead by now.
break_at(test_source, 'Test locking (robust)')
continue_cmd()
test_printer(var, to_string, {'Owner ID': r'{0} \(dead\)'.format(child_id)})
# Try to lock and unlock the mutex.
next_cmd()
test_printer(var, to_string, {'Owner ID': thread_id,
'State protected by this mutex': 'Inconsistent'})
next_cmd()
test_printer(var, to_string, {'Status': 'Unlocked',
'State protected by this mutex': 'Not recoverable'})
set_scheduler_locking(False)
break_at(test_source, 'Test recursive locks')
continue_cmd() # Go to test_recursive_locks
test_printer(var, to_string, {'Times locked recursively': '2'})
next_cmd()
test_printer(var, to_string, {'Times locked recursively': '3'})
continue_cmd() # Exit
except (NoLineError, pexpect.TIMEOUT) as exception:
print('Error: {0}'.format(exception))
result = FAIL
exit(result)

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/* Helper program for testing the pthread_rwlock_t and pthread_rwlockattr_t
pretty printers.
Copyright (C) 2016 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/>. */
/* Keep the calls to the pthread_* functions on separate lines to make it easy
to advance through the program using the gdb 'next' command. */
#include <pthread.h>
#define PASS 0
#define FAIL 1
/* Need these so we don't have lines longer than 79 chars. */
#define SET_KIND(attr, kind) pthread_rwlockattr_setkind_np (attr, kind)
#define SET_SHARED(attr, shared) pthread_rwlockattr_setpshared (attr, shared)
static int rwlock_reinit (pthread_rwlock_t *rwlock,
const pthread_rwlockattr_t *attr);
static int test_setkind_np (pthread_rwlock_t *rwlock,
pthread_rwlockattr_t *attr);
static int test_setpshared (pthread_rwlock_t *rwlock,
pthread_rwlockattr_t *attr);
int
main (void)
{
pthread_rwlock_t rwlock;
pthread_rwlockattr_t attr;
int result = FAIL;
if (pthread_rwlockattr_init (&attr) == 0
&& pthread_rwlock_init (&rwlock, NULL) == 0
&& test_setkind_np (&rwlock, &attr) == PASS
&& test_setpshared (&rwlock, &attr) == PASS)
result = PASS;
/* Else, one of the pthread_rwlock* functions failed. */
return result;
}
/* Destroys RWLOCK and re-initializes it using ATTR. */
static int
rwlock_reinit (pthread_rwlock_t *rwlock, const pthread_rwlockattr_t *attr)
{
int result = FAIL;
if (pthread_rwlock_destroy (rwlock) == 0
&& pthread_rwlock_init (rwlock, attr) == 0)
result = PASS;
return result;
}
/* Tests setting whether the rwlock prefers readers or writers. */
static int
test_setkind_np (pthread_rwlock_t *rwlock, pthread_rwlockattr_t *attr)
{
int result = FAIL;
if (SET_KIND (attr, PTHREAD_RWLOCK_PREFER_READER_NP) == 0 /* Set kind. */
&& rwlock_reinit (rwlock, attr) == PASS
&& SET_KIND (attr, PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP) == 0
&& rwlock_reinit (rwlock, attr) == PASS)
result = PASS;
return result;
}
/* Tests setting whether the rwlock can be shared between processes. */
static int
test_setpshared (pthread_rwlock_t *rwlock, pthread_rwlockattr_t *attr)
{
int result = FAIL;
if (SET_SHARED (attr, PTHREAD_PROCESS_SHARED) == 0 /* Set shared. */
&& rwlock_reinit (rwlock, attr) == PASS
&& SET_SHARED (attr, PTHREAD_PROCESS_PRIVATE) == 0
&& rwlock_reinit (rwlock, attr) == PASS)
result = PASS;
return result;
}

62
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# Common tests for the RWLockPrinter and RWLockAttributesPrinter classes.
#
# Copyright (C) 2016 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/>.
import sys
from test_common import *
test_source = sys.argv[1]
test_bin = sys.argv[2]
result = PASS
try:
init_test(test_bin)
go_to_main()
rwlock_var = 'rwlock'
rwlock_to_string = 'pthread_rwlock_t'
attr_var = 'attr'
attr_to_string = 'pthread_rwlockattr_t'
break_at(test_source, 'Set kind')
continue_cmd() # Go to test_setkind_np
next_cmd(2)
test_printer(rwlock_var, rwlock_to_string, {'Prefers': 'Readers'})
test_printer(attr_var, attr_to_string, {'Prefers': 'Readers'})
next_cmd(2)
test_printer(rwlock_var, rwlock_to_string, {'Prefers': 'Writers'})
test_printer(attr_var, attr_to_string, {'Prefers': 'Writers'})
break_at(test_source, 'Set shared')
continue_cmd() # Go to test_setpshared
next_cmd(2)
test_printer(rwlock_var, rwlock_to_string, {'Shared': 'Yes'})
test_printer(attr_var, attr_to_string, {'Shared': 'Yes'})
next_cmd(2)
test_printer(rwlock_var, rwlock_to_string, {'Shared': 'No'})
test_printer(attr_var, attr_to_string, {'Shared': 'No'})
continue_cmd() # Exit
except (NoLineError, pexpect.TIMEOUT) as exception:
print('Error: {0}'.format(exception))
result = FAIL
exit(result)

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/* Helper program for testing the pthread_rwlock_t pretty printer.
Copyright (C) 2016 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/>. */
/* Keep the calls to the pthread_* functions on separate lines to make it easy
to advance through the program using the gdb 'next' command. */
#include <pthread.h>
#define PASS 0
#define FAIL 1
static int test_locking_reader (pthread_rwlock_t *rwlock);
static int test_locking_writer (pthread_rwlock_t *rwlock);
int
main (void)
{
pthread_rwlock_t rwlock;
int result = FAIL;
if (test_locking_reader (&rwlock) == PASS
&& test_locking_writer (&rwlock) == PASS)
result = PASS;
/* Else, one of the pthread_rwlock* functions failed. */
return result;
}
/* Tests locking the rwlock multiple times as a reader. */
static int
test_locking_reader (pthread_rwlock_t *rwlock)
{
int result = FAIL;
if (pthread_rwlock_init (rwlock, NULL) == 0
&& pthread_rwlock_rdlock (rwlock) == 0 /* Test locking (reader). */
&& pthread_rwlock_rdlock (rwlock) == 0
&& pthread_rwlock_rdlock (rwlock) == 0
&& pthread_rwlock_unlock (rwlock) == 0
&& pthread_rwlock_unlock (rwlock) == 0
&& pthread_rwlock_unlock (rwlock) == 0
&& pthread_rwlock_destroy (rwlock) == 0)
result = PASS;
return result;
}
/* Tests locking the rwlock as a writer. */
static int
test_locking_writer (pthread_rwlock_t *rwlock)
{
int result = FAIL;
if (pthread_rwlock_init (rwlock, NULL) == 0
&& pthread_rwlock_wrlock (rwlock) == 0 /* Test locking (writer). */
&& pthread_rwlock_unlock (rwlock) == 0
&& pthread_rwlock_destroy (rwlock) == 0)
result = PASS;
return result;
}

59
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# Common tests for the RWLockPrinter class.
#
# Copyright (C) 2016 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/>.
import sys
from test_common import *
test_source = sys.argv[1]
test_bin = sys.argv[2]
result = PASS
try:
init_test(test_bin)
go_to_main()
var = 'rwlock'
to_string = 'pthread_rwlock_t'
break_at(test_source, 'Test locking (reader)')
continue_cmd() # Go to test_locking_reader
test_printer(var, to_string, {'Status': 'Unlocked'})
next_cmd()
test_printer(var, to_string, {'Status': r'Locked \(Read\)', 'Readers': '1'})
next_cmd()
test_printer(var, to_string, {'Readers': '2'})
next_cmd()
test_printer(var, to_string, {'Readers': '3'})
break_at(test_source, 'Test locking (writer)')
continue_cmd() # Go to test_locking_writer
test_printer(var, to_string, {'Status': 'Unlocked'})
next_cmd()
thread_id = get_current_thread_lwpid()
test_printer(var, to_string, {'Status': r'Locked \(Write\)',
'Writer ID': thread_id})
continue_cmd() # Exit
except (NoLineError, pexpect.TIMEOUT) as exception:
print('Error: {0}'.format(exception))
result = FAIL
exit(result)

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# Common functions and variables for testing the Python pretty printers.
#
# Copyright (C) 2016 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/>.
"""These tests require PExpect.
Attributes:
PASS, FAIL, UNSUPPORTED (int): Test exit codes, as per evaluate-test.sh.
GDB (string): A string with the name of the gdb binary.
gdb (pexpect.spawn): The gdb process, as handled by PExpect.
gdb_prompt (raw string): A pattern for matching the gdb prompt.
"""
import os
import re
PASS = 0
FAIL = 1
UNSUPPORTED = 77
GDB = 'gdb'
try:
import pexpect
except ImportError:
print('PExpect must be installed in order to test the pretty printers.')
exit(UNSUPPORTED)
if not pexpect.which(GDB):
print('gdb must be installed in order to test the pretty printers.')
exit(UNSUPPORTED)
class NoLineError(Exception):
"""Custom exception which indicates that a test file doesn't contain
the requested string.
"""
def __init__(self, file_name, string):
"""Constructor.
Args:
file_name (string): The name of the test file.
string (string): The string that was requested.
"""
super(NoLineError, self).__init__()
self.file_name = file_name
self.string = string
def __str__(self):
"""Shows a readable representation of the exception."""
return ('File {0} has no line containing the following string: {1}'
.format(self.file_name, self.string))
timeout = 1
TIMEOUTFACTOR = os.environ.get('TIMEOUTFACTOR')
if TIMEOUTFACTOR:
timeout = int(TIMEOUTFACTOR)
gdb = pexpect.spawn(GDB, echo=False, timeout=timeout)
# Set the gdb prompt to a custom one, so that user-defined prompts won't
# interfere. We assume the user won't have his prompt set to this.
gdb_prompt = r'gdb-test% '
gdb.sendline('set prompt {0}'.format(gdb_prompt))
gdb.expect(gdb_prompt)
def test(command, pattern):
"""Sends 'command' to gdb and expects the given 'pattern'.
If 'pattern' is None, simply consumes everything up to and including
the gdb prompt.
Args:
command (string): The command we'll send to gdb.
pattern (raw string): A pattern the gdb output should match.
Returns:
string: The string that matched 'pattern', or an empty string if
'pattern' was None.
"""
match = ''
gdb.sendline(command)
if pattern:
# PExpect does a non-greedy match for '+' and '*'. Since it can't look
# ahead on the gdb output stream, if 'pattern' ends with a '+' or a '*'
# we may end up matching only part of the required output.
# To avoid this, we'll consume 'pattern' and anything that follows it
# up to and including the gdb prompt, then extract 'pattern' later.
index = gdb.expect([r'{0}.+{1}'.format(pattern, gdb_prompt),
pexpect.TIMEOUT])
if index == 0:
# gdb.after now contains the whole match. Extract the text that
# matches 'pattern'.
match = re.match(pattern, gdb.after, re.DOTALL).group()
elif index == 1:
# We got a timeout exception. Print information on what caused it
# and bail out.
error = ('Response does not match the expected pattern.\n'
'Command: {0}\n'
'Expected pattern: {1}\n'
'Response: {2}'.format(command, pattern, gdb.before))
raise pexpect.TIMEOUT(error)
else:
# Consume just the the gdb prompt.
gdb.expect(gdb_prompt)
return match
def init_test(test_bin):
"""Loads the test binary file to gdb.
Args:
test_bin (string): The name of the test binary file.
"""
test('file {0}'.format(test_bin), None)
def go_to_main():
"""Executes a gdb 'start' command, which takes us to main."""
test('start', r'main')
def get_line_number(file_name, string):
"""Returns the number of the line in which 'string' appears within a file.
Args:
file_name (string): The name of the file we'll search through.
string (string): The string we'll look for.
Returns:
int: The number of the line in which 'string' appears, starting from 1.
"""
number = -1
with open(file_name) as src_file:
for i, line in enumerate(src_file):
if string in line:
number = i + 1
break
if number == -1:
raise NoLineError(file_name, string)
return number
def break_at(file_name, string, temporary=True, thread=None):
"""Places a breakpoint on the first line in 'file_name' containing 'string'.
'string' is usually a comment like "Stop here". Notice this may fail unless
the comment is placed inline next to actual code, e.g.:
...
/* Stop here */
...
may fail, while:
...
some_func(); /* Stop here */
...
will succeed.
If 'thread' isn't None, the breakpoint will be set for all the threads.
Otherwise, it'll be set only for 'thread'.
Args:
file_name (string): The name of the file we'll place the breakpoint in.
string (string): A string we'll look for inside the file.
We'll place a breakpoint on the line which contains it.
temporary (bool): Whether the breakpoint should be automatically deleted
after we reach it.
thread (int): The number of the thread we'll place the breakpoint for,
as seen by gdb. If specified, it should be greater than zero.
"""
if not thread:
thread_str = ''
else:
thread_str = 'thread {0}'.format(thread)
if temporary:
command = 'tbreak'
break_type = 'Temporary breakpoint'
else:
command = 'break'
break_type = 'Breakpoint'
line_number = str(get_line_number(file_name, string))
test('{0} {1}:{2} {3}'.format(command, file_name, line_number, thread_str),
r'{0} [0-9]+ at 0x[a-f0-9]+: file {1}, line {2}\.'.format(break_type,
file_name,
line_number))
def continue_cmd(thread=None):
"""Executes a gdb 'continue' command.
If 'thread' isn't None, the command will be applied to all the threads.
Otherwise, it'll be applied only to 'thread'.
Args:
thread (int): The number of the thread we'll apply the command to,
as seen by gdb. If specified, it should be greater than zero.
"""
if not thread:
command = 'continue'
else:
command = 'thread apply {0} continue'.format(thread)
test(command, None)
def next_cmd(count=1, thread=None):
"""Executes a gdb 'next' command.
If 'thread' isn't None, the command will be applied to all the threads.
Otherwise, it'll be applied only to 'thread'.
Args:
count (int): The 'count' argument of the 'next' command.
thread (int): The number of the thread we'll apply the command to,
as seen by gdb. If specified, it should be greater than zero.
"""
if not thread:
command = 'next'
else:
command = 'thread apply {0} next'
test('{0} {1}'.format(command, count), None)
def select_thread(thread):
"""Selects the thread indicated by 'thread'.
Args:
thread (int): The number of the thread we'll switch to, as seen by gdb.
This should be greater than zero.
"""
if thread > 0:
test('thread {0}'.format(thread), None)
def get_current_thread_lwpid():
"""Gets the current thread's Lightweight Process ID.
Returns:
string: The current thread's LWP ID.
"""
# It's easier to get the LWP ID through the Python API than the gdb CLI.
command = 'python print(gdb.selected_thread().ptid[1])'
return test(command, r'[0-9]+')
def set_scheduler_locking(mode):
"""Executes the gdb 'set scheduler-locking' command.
Args:
mode (bool): Whether the scheduler locking mode should be 'on'.
"""
modes = {
True: 'on',
False: 'off'
}
test('set scheduler-locking {0}'.format(modes[mode]), None)
def test_printer(var, to_string, children=None, is_ptr=True):
""" Tests the output of a pretty printer.
For a variable called 'var', this tests whether its associated printer
outputs the expected 'to_string' and children (if any).
Args:
var (string): The name of the variable we'll print.
to_string (raw string): The expected output of the printer's 'to_string'
method.
children (map {raw string->raw string}): A map with the expected output
of the printer's children' method.
is_ptr (bool): Whether 'var' is a pointer, and thus should be
dereferenced.
"""
if is_ptr:
var = '*{0}'.format(var)
test('print {0}'.format(var), to_string)
if children:
for name, value in children.items():
# Children are shown as 'name = value'.
test('print {0}'.format(var), r'{0} = {1}'.format(name, value))

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# Script to generate constants for Python pretty printers.
#
# Copyright (C) 2016 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 script is a smaller version of the clever gen-asm-const.awk hack used to
# generate ASM constants from .sym files. We'll use this to generate constants
# for Python pretty printers.
#
# The input to this script are .pysym files that look like:
# #C_Preprocessor_Directive...
# NAME1
# NAME2 expression...
#
# A line giving just a name implies an expression consisting of just that name.
# Comments start with '--'.
#
# The output of this script is a 'dummy' function containing 'asm' declarations
# for each non-preprocessor line in the .pysym file. The expression values
# will appear as input operands to the 'asm' declaration. For example, if we
# have:
#
# /* header.h */
# #define MACRO 42
#
# struct S {
# char c1;
# char c2;
# char c3;
# };
#
# enum E {
# ZERO,
# ONE
# };
#
# /* symbols.pysym */
# #include <stddef.h>
# #include "header.h"
# -- This is a comment
# MACRO
# C3_OFFSET offsetof(struct S, c3)
# E_ONE ONE
#
# the output will be:
#
# #include <stddef.h>
# #include "header.h"
# void dummy(void)
# {
# asm ("@name@MACRO@value@%0@" : : "i" (MACRO));
# asm ("@name@C3_OFFSET@value@%0@" : : "i" (offsetof(struct S, c3)));
# asm ("@name@E_ONE@value@%0@" : : "i" (ONE));
# }
#
# We'll later feed this output to gcc -S. Since '-S' tells gcc to compile but
# not assemble, gcc will output something like:
#
# dummy:
# ...
# @name@MACRO@value@$42@
# @name@C3_OFFSET@value@$2@
# @name@E_ONE@value@$1@
#
# Finally, we can process that output to extract the constant values.
# Notice gcc may prepend a special character such as '$' to each value.
# found_symbol indicates whether we found a non-comment, non-preprocessor line.
BEGIN { found_symbol = 0 }
# C preprocessor directives go straight through.
/^#/ { print; next; }
# Skip comments.
/--/ { next; }
# Trim leading whitespace.
{ sub(/^[[:blank:]]*/, ""); }
# If we found a non-comment, non-preprocessor line, print the 'dummy' function
# header.
NF > 0 && !found_symbol {
print "void dummy(void)\n{";
found_symbol = 1;
}
# If the line contains just a name, duplicate it so we can use that name
# as the value of the expression.
NF == 1 { sub(/^.*$/, "& &"); }
# If a line contains a name and an expression...
NF > 1 {
name = $1;
# Remove any characters before the second field.
sub(/^[^[:blank:]]+[[:blank:]]+/, "");
# '$0' ends up being everything that appeared after the first field
# separator.
printf " asm (\"@name@%s@value@%0@\" : : \"i\" (%s));\n", name, $0;
}
# Close the 'dummy' function.
END { if (found_symbol) print "}"; }