path: root/INSTALL
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authorMartin Galvan <martin.galvan@tallertechnologies.com>2016-12-08 18:59:02 +0530
committerSiddhesh Poyarekar <siddhesh@sourceware.org>2016-12-08 18:59:02 +0530
commit23b5cae1af04f2d912910fdaf73cb482265798c1 (patch)
treed7d463b80da7c33ada5073d1e09bc889639b82e7 /INSTALL
parent297635d82bf5ff55899f694a5261ffd97636df98 (diff)
Add pretty printers for the NPTL lock types
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 tested on an AMD64 running Ubuntu 14.04 and an x86 VM running Fedora 24. 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 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 native builds and a cross build using a Beaglebone Black running Debian, with the build system's filesystem shared with the board through NFS. Finally, I've written a README that explains all this and more. * INSTALL: Regenerated. * Makeconfig: Add comments and whitespace to make the control flow clearer. (+link-printers-tests, +link-pie-printers-tests, CFLAGS-printers-tests, installed-rtld-LDFLAGS, built-rtld-LDFLAGS, link-libc-rpath, link-libc-tests-after-rpath-link, link-libc-printers-tests): New. (rtld-LDFLAGS, rtld-tests-LDFLAGS, link-libc-tests-rpath-link, link-libc-tests): Use the new variables as required. * Makerules ($(py-const)): New rule. generated: Add $(py-const). * README.pretty-printers: New file. * Rules (tests-printers-programs, tests-printers-out, py-env): New. (others): Depend on $(py-const). (tests): Depend on $(tests-printers-programs) or $(tests-printers-out), as required. Pass $(tests-printers) to merge-test-results.sh. * manual/install.texi: Add requirements for testing the pretty printers. * nptl/Makefile (gen-py-const-headers, pretty-printers, tests-printers, CFLAGS-test-mutexattr-printers.c CFLAGS-test-mutex-printers.c, CFLAGS-test-condattr-printers.c, CFLAGS-test-cond-printers.c, CFLAGS-test-rwlockattr-printers.c CFLAGS-test-rwlock-printers.c, tests-printers-libs): Define. * nptl/nptl-printers.py: New file. * nptl/nptl_lock_constants.pysym: Likewise. * nptl/test-cond-printers.c: Likewise. * nptl/test-cond-printers.py: Likewise. * nptl/test-condattr-printers.c: Likewise. * nptl/test-condattr-printers.py: Likewise. * nptl/test-mutex-printers.c: Likewise. * nptl/test-mutex-printers.py: Likewise. * nptl/test-mutexattr-printers.c: Likewise. * nptl/test-mutexattr-printers.py: Likewise. * nptl/test-rwlock-printers.c: Likewise. * nptl/test-rwlock-printers.py: Likewise. * nptl/test-rwlockattr-printers.c: Likewise. * nptl/test-rwlockattr-printers.py: Likewise. * scripts/gen-py-const.awk: Likewise. * scripts/test_printers_common.py: Likewise. * scripts/test_printers_exceptions.py: Likewise.
Diffstat (limited to 'INSTALL')
1 files changed, 27 insertions, 0 deletions
diff --git a/INSTALL b/INSTALL
index b5acedcc969..acb622a1022 100644
@@ -224,6 +224,33 @@ You can specify 'stop-on-test-failure=y' when running 'make check' to
make the test run stop and exit with an error status immediately when a
failure occurs.
+ The GNU C Library pretty printers come with their own set of scripts
+for testing, which run together with the rest of the testsuite through
+'make check'. These scripts require the following tools to run
+ * Python 2.7.6/3.4.3 or later
+ Python is required for running the printers' test scripts.
+ * PExpect 4.0
+ The printer tests drive GDB through test programs and compare its
+ output to the printers'. PExpect is used to capture the output of
+ GDB, and should be compatible with the Python version in your
+ system.
+ * GDB 7.8 or later with support for Python 2.7.6/3.4.3 or later
+ GDB itself needs to be configured with Python support in order to
+ use the pretty printers. Notice that your system having Python
+ available doesn't imply that GDB supports it, nor that your
+ system's Python and GDB's have the same version.
+If these tools are absent, the printer tests will report themselves as
+'UNSUPPORTED'. Notice that some of the printer tests require the GNU C
+Library to be compiled with debugging symbols.
To format the 'GNU C Library Reference Manual' for printing, type
'make dvi'. You need a working TeX installation to do this. The
distribution builds the on-line formatted version of the manual, as Info