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e6fd79f379
glibc/support/Makefile
Chung-Lin Tang e6fd79f379 elf: Testing infrastructure for ld.so DSO sorting (BZ #17645) 
This is the first of a 2-part patch set that fixes slow DSO sorting behavior in
the dynamic loader, as reported in BZ #17645. In order to facilitate such a
large modification to the dynamic loader, this first patch implements a testing
framework for validating shared object sorting behavior, to enable comparison
between old/new sorting algorithms, and any later enhancements.

This testing infrastructure consists of a Python script
scripts/dso-ordering-test.py' which takes in a description language, consisting
of strings that describe a set of link dependency relations between DSOs, and
generates testcase programs and Makefile fragments to automatically test the
described situation, for example:

  a->b->c->d          # four objects linked one after another

  a->[bc]->d;b->c     # a depends on b and c, which both depend on d,
                      # b depends on c (b,c linked to object a in fixed order)

  a->b->c;{+a;%a;-a}  # a, b, c serially dependent, main program uses
                      # dlopen/dlsym/dlclose on object a

  a->b->c;{}!->[abc]  # a, b, c serially dependent; multiple tests generated
                      # to test all permutations of a, b, c ordering linked
                      # to main program

 (Above is just a short description of what the script can do, more
  documentation is in the script comments.)

Two files containing several new tests, elf/dso-sort-tests-[12].def are added,
including test scenarios for BZ #15311 and Redhat issue #1162810 [1].

Due to the nature of dynamic loader tests, where the sorting behavior and test
output occurs before/after main(), generating testcases to use
support/test-driver.c does not suffice to control meaningful timeout for ld.so.
Therefore a new utility program 'support/test-run-command', based on
test-driver.c/support_test_main.c has been added. This does the same testcase
control, but for a program specified through a command-line rather than at the
source code level. This utility is used to run the dynamic loader testcases
generated by dso-ordering-test.py.

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1162810

Signed-off-by: Chung-Lin Tang  <cltang@codesourcery.com>
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
2021-10-21 11:23:53 -03:00

309 lines
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Makefile
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# Makefile for support library, used only at build and test time
# Copyright (C) 2016-2021 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
# <https://www.gnu.org/licenses/>.
subdir := support
include ../Makeconfig
extra-libs := libsupport
extra-libs-others = $(extra-libs)
extra-libs-noinstall := $(extra-libs)
libsupport-routines = \
blob_repeat \
check \
check_addrinfo \
check_dns_packet \
check_hostent \
check_netent \
delayed_exit \
ignore_stderr \
next_to_fault \
oom_error \
resolv_response_context_duplicate \
resolv_response_context_free \
resolv_test \
set_fortify_handler \
support_stack_alloc \
support-xfstat \
support-xfstat-time64 \
support-xstat \
support-xstat-time64 \
support_become_root \
support_can_chroot \
support_capture_subprocess \
support_capture_subprocess_check \
support_chroot \
support_copy_file \
support_copy_file_range \
support_create_timer \
support_descriptor_supports_holes \
support_descriptors \
support_enter_mount_namespace \
support_enter_network_namespace \
support_format_address_family \
support_format_addrinfo \
support_format_dns_packet \
support_format_herrno \
support_format_hostent \
support_format_netent \
support_isolate_in_subprocess \
support_mutex_pi_monotonic \
support_path_support_time64 \
support_process_state \
support_ptrace \
support-open-dev-null-range \
support_openpty \
support_paths \
support_quote_blob \
support_quote_blob_wide \
support_quote_string \
support_record_failure \
support_run_diff \
support_select_modifies_timeout \
support_select_normalizes_timeout \
support_set_small_thread_stack_size \
support_shared_allocate \
support_small_stack_thread_attribute \
support_stat_nanoseconds \
support_subprocess \
support_test_compare_blob \
support_test_compare_failure \
support_test_compare_string \
support_test_compare_string_wide \
support_test_main \
support_test_verify_impl \
support_wait_for_thread_exit \
support_write_file_string \
temp_file \
timespec \
timespec-time64 \
timespec-add \
timespec-add-time64 \
timespec-sub \
timespec-sub-time64 \
write_message \
xaccept \
xaccept4 \
xasprintf \
xbind \
xcalloc \
xchdir \
xchroot \
xclock_gettime \
xclock_gettime_time64 \
xclock_settime \
xclock_settime_time64 \
xclone \
xclose \
xchmod \
xconnect \
xcopy_file_range \
xdlfcn \
xdlmopen \
xdup2 \
xfchmod \
xfclose \
xfopen \
xfork \
xftruncate \
xgetline \
xgetsockname \
xlisten \
xlseek \
xlstat \
xlstat-time64 \
xmalloc \
xmemstream \
xmkdir \
xmkdirp \
xmmap \
xmprotect \
xmunmap \
xnewlocale \
xopen \
xpipe \
xpoll \
xposix_memalign \
xpthread_attr_destroy \
xpthread_attr_init \
xpthread_attr_setdetachstate \
xpthread_attr_setguardsize \
xpthread_attr_setaffinity_np \
xpthread_attr_setstack \
xpthread_attr_setstacksize \
xpthread_barrier_destroy \
xpthread_barrier_init \
xpthread_barrier_wait \
xpthread_barrierattr_destroy \
xpthread_barrierattr_init \
xpthread_barrierattr_setpshared \
xpthread_cancel \
xpthread_check_return \
xpthread_cond_wait \
xpthread_create \
xpthread_detach \
xpthread_join \
xpthread_key_create \
xpthread_key_delete \
xpthread_kill \
xpthread_mutex_consistent \
xpthread_mutex_destroy \
xpthread_mutex_init \
xpthread_mutex_lock \
xpthread_mutex_unlock \
xpthread_mutexattr_destroy \
xpthread_mutexattr_init \
xpthread_mutexattr_setprotocol \
xpthread_mutexattr_setpshared \
xpthread_mutexattr_setrobust \
xpthread_mutexattr_settype \
xpthread_once \
xpthread_rwlock_init \
xpthread_rwlock_destroy \
xpthread_rwlock_rdlock \
xpthread_rwlock_unlock \
xpthread_rwlock_wrlock \
xpthread_rwlockattr_init \
xpthread_rwlockattr_setkind_np \
xpthread_sigmask \
xpthread_spin_lock \
xpthread_spin_unlock \
xraise \
xreadlink \
xrealloc \
xrecvfrom \
xsendto \
xsetlocale \
xsetsockopt \
xsigaction \
xsignal \
xsigstack \
xsocket \
xposix_spawn \
xposix_spawn_file_actions_addclose \
xposix_spawn_file_actions_adddup2 \
xstrdup \
xstrndup \
xsymlink \
xsysconf \
xunlink \
xuselocale \
xwaitpid \
xwrite \
libsupport-static-only-routines := $(libsupport-routines)
# Only build one variant of the library.
libsupport-inhibit-o := .os
ifeq ($(build-shared),yes)
libsupport-inhibit-o += .o
endif
CFLAGS-support_paths.c = \
-DSRCDIR_PATH=\"`cd .. ; pwd`\" \
-DOBJDIR_PATH=\"`cd $(objpfx)/..; pwd`\" \
-DOBJDIR_ELF_LDSO_PATH=\"`cd $(objpfx)/..; pwd`/elf/$(rtld-installed-name)\" \
-DINSTDIR_PATH=\"$(prefix)\" \
-DLIBDIR_PATH=\"$(libdir)\" \
-DBINDIR_PATH=\"$(bindir)\" \
-DSBINDIR_PATH=\"$(sbindir)\" \
-DSLIBDIR_PATH=\"$(slibdir)\" \
-DROOTSBINDIR_PATH=\"$(rootsbindir)\" \
-DCOMPLOCALEDIR_PATH=\"$(complocaledir)\"
# In support_timespec_check_in_range we may be passed a very tight
# range for which we should produce a correct result for expected
# being withing the observed range. The code uses double internally
# in support_timespec_check_in_range and for that computation we use
# -fexcess-precision=standard.
CFLAGS-timespec.c += -fexcess-precision=standard
CFLAGS-timespec-time64.c += -fexcess-precision=standard
ifeq (,$(CXX))
LINKS_DSO_PROGRAM = links-dso-program-c
else
LINKS_DSO_PROGRAM = links-dso-program
LDLIBS-links-dso-program = -lstdc++ -lgcc -lgcc_s $(libunwind)
endif
ifeq (yes,$(have-selinux))
LDLIBS-$(LINKS_DSO_PROGRAM) += -lselinux
endif
LDLIBS-test-container = $(libsupport)
others += test-container
others-noinstall += test-container
others += shell-container echo-container true-container
others-noinstall += shell-container echo-container true-container
others += $(LINKS_DSO_PROGRAM)
others-noinstall += $(LINKS_DSO_PROGRAM)
others += test-run-command
others-static += test-run-command
others-noinstall += test-run-command
LDLIBS-test-run-command = $(libsupport)
$(objpfx)test-container : $(libsupport)
$(objpfx)shell-container : $(libsupport)
$(objpfx)echo-container : $(libsupport)
$(objpfx)true-container : $(libsupport)
$(objpfx)test-run-command : $(libsupport) $(common-objpfx)elf/static-stubs.o
tests = \
README-testing \
tst-support-namespace \
tst-support_blob_repeat \
tst-support_capture_subprocess \
tst-support_descriptors \
tst-support_format_dns_packet \
tst-support-open-dev-null-range \
tst-support-process_state \
tst-support_quote_blob \
tst-support_quote_blob_wide \
tst-support_quote_string \
tst-support_record_failure \
tst-test_compare \
tst-test_compare_blob \
tst-test_compare_string \
tst-test_compare_string_wide \
tst-timespec \
tst-xreadlink \
tst-xsigstack \
ifeq ($(run-built-tests),yes)
tests-special = \
$(objpfx)tst-support_record_failure-2.out
$(objpfx)tst-support_record_failure-2.out: tst-support_record_failure-2.sh \
$(objpfx)tst-support_record_failure
$(SHELL) $< $(common-objpfx) '$(test-program-prefix-before-env)' \
'$(run-program-env)' '$(test-program-prefix-after-env)' \
> $@; \
$(evaluate-test)
endif
$(objpfx)tst-support_format_dns_packet: $(common-objpfx)resolv/libresolv.so
tst-support_capture_subprocess-ARGS = -- $(host-test-program-cmd)
include ../Rules
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