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glibc/Rules
Martin Galvan 62ce266b0b 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 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.
2016-07-08 20:03:05 +05:30

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# Copyright (C) 1991-2016 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/>.
#
# Rules for making a subdirectory in the GNU C library.
# Each subdirectory Makefile defines some variables and includes this.
#
ifneq (,)
This makefile requires GNU Make.
endif
all: # Don't let the default goal come from Makeconfig.
include $(firstword $(..) ../)Makeconfig
ifndef subdir
Each subdirectory makefile must define the `subdir' variable.
endif
# This ` unconfuses emacs.
# This is benign and useless in GNU make before 3.63.
export subdir := $(subdir)
# This is the default target; it makes the library and auxiliary programs.
.PHONY: all
all: objs lib others
ifeq ($(build-programs),yes)
others: $(addprefix $(objpfx),$(extra-objs) \
$(install-lib) \
$(install-bin) $(install-bin-script) \
$(install-rootsbin) $(install-sbin))
else
others: $(addprefix $(objpfx),$(extra-objs) \
$(install-lib))
endif
ifneq "$(findstring env,$(origin headers))" ""
headers :=
endif
ifneq "$(findstring env,$(origin generated))" ""
generated :=
endif
ifneq "$(findstring env,$(origin common-generated))" ""
common-generated :=
endif
# See below. This must be set before Makerules processes it.
before-compile += $(common-objpfx)bits/stdio_lim.h
include $(..)Makerules
.PHONY: subdir_lib
subdir_lib: lib-noranlib
# Some subdirs need to install a dummy library.
# They can use "$(objpfx)libfnord.a: $(dep-dummy-lib); $(make-dummy-lib)".
dep-dummy-lib = $(common-objpfx)dummy.o
define make-dummy-lib
$(AR) cr$(verbose) $@ $<
endef
$(common-objpfx)dummy.c:
rm -f $@
(echo 'extern void __dummy__ (void);'; \
echo 'void __dummy__ (void) { }') > $@
common-generated += dummy.o dummy.c
# This makes all the auxiliary and test programs.
.PHONY: others tests bench bench-build
ifeq ($(build-programs),yes)
others: $(addprefix $(objpfx),$(others) $(sysdep-others) $(extra-objs))
else
others: $(addprefix $(objpfx),$(extra-objs))
endif
ifeq ($(run-built-tests),no)
tests: $(addprefix $(objpfx),$(tests) $(test-srcs)) $(tests-special)
xtests: tests $(xtests-special)
else
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:
$(..)scripts/merge-test-results.sh -s $(objpfx) $(subdir) \
$(sort $(tests) $(tests-special-notdir:.out=)) \
> $(objpfx)subdir-tests.sum
xtests:
$(..)scripts/merge-test-results.sh -s $(objpfx) $(subdir) \
$(sort $(xtests) $(xtests-special-notdir:.out=)) \
> $(objpfx)subdir-xtests.sum
ifeq ($(build-programs),yes)
binaries-all-notests = $(others) $(sysdep-others)
binaries-all-tests = $(tests) $(xtests) $(test-srcs)
binaries-all = $(binaries-all-notests) $(binaries-all-tests)
binaries-static-notests = $(others-static)
binaries-static-tests = $(tests-static) $(xtests-static)
binaries-static = $(binaries-static-notests) $(binaries-static-tests)
ifeq (yesyes,$(have-fpie)$(build-shared))
binaries-pie-tests = $(tests-pie) $(xtests-pie)
binaries-pie-notests = $(others-pie)
else
binaries-pie-tests =
binaries-pie-notests =
endif
else
binaries-all-notests =
binaries-all-tests = $(tests) $(xtests) $(test-srcs)
binaries-all = $(binaries-all-tests)
binaries-static-notests =
binaries-static-tests =
binaries-static =
binaries-pie-tests =
binaries-pie-notests =
endif
binaries-pie = $(binaries-pie-tests) $(binaries-pie-notests)
binaries-shared-tests = $(filter-out $(binaries-pie) $(binaries-static), \
$(binaries-all-tests))
binaries-shared-notests = $(filter-out $(binaries-pie) $(binaries-static), \
$(binaries-all-notests))
ifneq "$(strip $(binaries-shared-notests))" ""
$(addprefix $(objpfx),$(binaries-shared-notests)): %: %.o \
$(sort $(filter $(common-objpfx)lib%,$(link-libc))) \
$(addprefix $(csu-objpfx),start.o) $(+preinit) $(+postinit)
$(+link)
endif
ifneq "$(strip $(binaries-shared-tests))" ""
$(addprefix $(objpfx),$(binaries-shared-tests)): %: %.o \
$(sort $(filter $(common-objpfx)lib%,$(link-libc))) \
$(addprefix $(csu-objpfx),start.o) $(+preinit) $(+postinit)
$(+link-tests)
endif
ifneq "$(strip $(binaries-pie-tests))" ""
$(addprefix $(objpfx),$(binaries-pie-tests)): %: %.o \
$(sort $(filter $(common-objpfx)lib%,$(link-libc))) \
$(addprefix $(csu-objpfx),start.o) $(+preinit) $(+postinit)
$(+link-pie-tests)
endif
ifneq "$(strip $(binaries-pie-notests))" ""
$(addprefix $(objpfx),$(binaries-pie-notests)): %: %.o \
$(sort $(filter $(common-objpfx)lib%,$(link-libc))) \
$(addprefix $(csu-objpfx),start.o) $(+preinit) $(+postinit)
$(+link-pie)
endif
ifneq "$(strip $(binaries-static-notests))" ""
$(addprefix $(objpfx),$(binaries-static-notests)): %: %.o \
$(sort $(filter $(common-objpfx)lib%,$(link-libc-static))) \
$(addprefix $(csu-objpfx),start.o) $(+preinit) $(+postinit)
$(+link-static)
endif
ifneq "$(strip $(binaries-static-tests))" ""
$(addprefix $(objpfx),$(binaries-static-tests)): %: %.o \
$(sort $(filter $(common-objpfx)lib%,$(link-libc-static-tests))) \
$(addprefix $(csu-objpfx),start.o) $(+preinit) $(+postinit)
$(+link-static-tests)
endif
ifneq "$(strip $(tests) $(xtests) $(test-srcs))" ""
# These are the implicit rules for making test outputs
# from the test programs and whatever input files are present.
define make-test-out
$(if $($*-ENV-only),$(test-wrapper-env-only) $($*-ENV-only),\
$(test-wrapper-env) $(run-program-env) $($*-ENV)) \
$(host-test-program-cmd) $($*-ARGS)
endef
$(objpfx)%.out: %.input $(objpfx)%
$(make-test-out) > $@ < $(word 1,$^); \
$(evaluate-test)
$(objpfx)%.out: /dev/null $(objpfx)% # Make it 2nd arg for canned sequence.
$(make-test-out) > $@; \
$(evaluate-test)
# tests-unsupported lists tests that we will not try to build at all in
# this configuration. Note this runs every time because it does not
# actually create its target. The dependency on Makefile is meant to
# ensure that it runs after a Makefile change to add a test to the list
# when it previously ran and produced a .out file (probably for a failure).
ifneq "$(strip $(tests-unsupported))" ""
$(tests-unsupported:%=$(objpfx)%.out): $(objpfx)%.out: Makefile
@rm -f $@
$(..)scripts/evaluate-test.sh $(patsubst $(common-objpfx)%.out,%,$@) \
77 false false > $(@:.out=.test-result)
endif
endif # tests
.PHONY: distclean realclean subdir_distclean subdir_realclean \
subdir_clean subdir_mostlyclean subdir_testclean
subdir_mostlyclean: mostlyclean
subdir_clean: clean
subdir_distclean: distclean
subdir_realclean: realclean
subdir_testclean: do-tests-clean
realclean: distclean
distclean: clean
# We want to install everything except the library itself, but update all
# our portions of the library because the parent make will install it later
# (likewise the stubs file).
.PHONY: subdir_install
subdir_install: install-no-libc.a lib-noranlib stubs
.PHONY: subdir_objs subdir_stubs
subdir_objs: objs
subdir_stubs: stubs
# Target required by the Hurd to ensure that all the MiG-generated
# headers are in place before building a subdirectory.
.PHONY: before-compile
before-compile: $(before-compile)
$(common-objpfx)dummy.o: $(common-objpfx)dummy.c $(before-compile);
$(compile-command.c)
# Local Variables:
# mode: makefile
# End:
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