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GNU C Library master sources branch, roland/systemtap, created. glibc-2.13-7-g79dfa10
- From: roland at sourceware dot org
- To: glibc-cvs at sourceware dot org
- Date: 26 Jan 2011 20:07:30 -0000
- Subject: GNU C Library master sources branch, roland/systemtap, created. glibc-2.13-7-g79dfa10
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at 79dfa10dd9e11a73a0a0c5c531efde0eaa72ee6d (commit)
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http://sources.redhat.com/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=79dfa10dd9e11a73a0a0c5c531efde0eaa72ee6d
commit 79dfa10dd9e11a73a0a0c5c531efde0eaa72ee6d
Author: Roland McGrath <roland@redhat.com>
Date: Fri Jul 23 02:32:50 2010 -0700
Add --enable-systemtap configuration to define static probe points.
diff --git a/ChangeLog b/ChangeLog
index 0dad46b..f6803a3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2011-01-26 Roland McGrath <roland@redhat.com>
+
+ * include/stap-probe.h: New file.
+ * configure.in: Handle --enable-systemtap.
+ * configure: Regenerated.
+ * config.h.in (USE_STAP_PROBE): New #undef.
+ * extra-lib.mk (CPPFLAGS-$(lib)): Add -DIN_LIB=$(lib).
+
2011-01-19 Ulrich Drepper <drepper@gmail.com>
[BZ #11724]
diff --git a/config.h.in b/config.h.in
index 9e797eb..7a3cd6a 100644
--- a/config.h.in
+++ b/config.h.in
@@ -204,6 +204,9 @@
/* Define if `.ctors' and `.dtors' sections shouldn't be used. */
#undef NO_CTORS_DTORS_SECTIONS
+/* Define if Systemtap <sys/sdt.h> probes should be defined. */
+#undef USE_STAP_PROBE
+
/*
*/
diff --git a/configure b/configure
index 999a448..0b72fe5 100755
--- a/configure
+++ b/configure
@@ -784,6 +784,7 @@ enable_all_warnings
enable_multi_arch
enable_experimental_malloc
enable_nss_crypt
+enable_systemtap
with_cpu
'
ac_precious_vars='build_alias
@@ -1444,6 +1445,7 @@ Optional Features:
--enable-experimental-malloc
enable experimental malloc features
--enable-nss-crypt enable libcrypt to use nss
+ --enable-systemtap enable systemtap static probe points [default=no]
Optional Packages:
--with-PACKAGE[=ARG] use PACKAGE [ARG=yes]
@@ -3823,6 +3825,51 @@ else
fi
+# Check whether --enable-systemtap was given.
+if test "${enable_systemtap+set}" = set; then :
+ enableval=$enable_systemtap; systemtap=$enableval
+else
+ systemtap=no
+fi
+
+if test x$systemtap != xno; then
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking for systemtap static probe support" >&5
+$as_echo_n "checking for systemtap static probe support... " >&6; }
+if test "${libc_cv_sdt+set}" = set; then :
+ $as_echo_n "(cached) " >&6
+else
+ old_CFLAGS="$CFLAGS"
+ CFLAGS="-std=gnu99 $CFLAGS"
+ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+#include <sys/sdt.h>
+void foo (int i, void *p)
+{
+ asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
+ :: STAP_PROBE_ASM_OPERANDS (2, i, p));
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+ libc_cv_sdt=yes
+else
+ libc_cv_sdt=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+ CFLAGS="$old_CFLAGS"
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_sdt" >&5
+$as_echo "$libc_cv_sdt" >&6; }
+ if test $libc_cv_sdt = yes; then
+ $as_echo "#define USE_STAP_PROBE 1" >>confdefs.h
+
+ else
+ { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error "systemtap support needs sys/sdt.h with asm support
+See \`config.log' for more details." "$LINENO" 5; }
+ fi
+fi
+
# The way shlib-versions is used to generate soversions.mk uses a
# fairly simplistic model for name recognition that can't distinguish
# i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a $host_os
diff --git a/configure.in b/configure.in
index 668dbd1..9bf9e4d 100644
--- a/configure.in
+++ b/configure.in
@@ -316,6 +316,29 @@ else
fi
AC_SUBST(libc_cv_nss_crypt)
+AC_ARG_ENABLE([systemtap],
+ [AS_HELP_STRING([--enable-systemtap],
+ [enable systemtap static probe points @<:@default=no@:>@])],
+ [systemtap=$enableval],
+ [systemtap=no])
+if test x$systemtap != xno; then
+ AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
+ old_CFLAGS="$CFLAGS"
+ CFLAGS="-std=gnu99 $CFLAGS"
+ AC_COMPILE_IFELSE([#include <sys/sdt.h>
+void foo (int i, void *p)
+{
+ asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
+ :: STAP_PROBE_ASM_OPERANDS (2, i, p));
+}], [libc_cv_sdt=yes], [libc_cv_sdt=no])
+ CFLAGS="$old_CFLAGS"])
+ if test $libc_cv_sdt = yes; then
+ AC_DEFINE([USE_STAP_PROBE])
+ else
+ AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
+ fi
+fi
+
# The way shlib-versions is used to generate soversions.mk uses a
# fairly simplistic model for name recognition that can't distinguish
# i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a $host_os
diff --git a/extra-lib.mk b/extra-lib.mk
index 775eb23..7f8516e 100644
--- a/extra-lib.mk
+++ b/extra-lib.mk
@@ -101,4 +101,4 @@ ifneq (,$(cpp-srcs-left))
include $(patsubst %,$(..)cppflags-iterator.mk,$(cpp-srcs-left))
endif
-CPPFLAGS-$(lib) := -DNOT_IN_libc=1 -DIS_IN_$(lib)=1
+CPPFLAGS-$(lib) := -DNOT_IN_libc=1 -DIS_IN_$(lib)=1 -DIN_LIB=$(lib)
diff --git a/include/stap-probe.h b/include/stap-probe.h
new file mode 100644
index 0000000..3032655
--- /dev/null
+++ b/include/stap-probe.h
@@ -0,0 +1,130 @@
+/* Macros for defining Systemtap <sys/sdt.h> static probe points.
+ Copyright (C) 2011 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#ifndef _STAP_PROBE_H
+#define _STAP_PROBE_H 1
+
+#ifdef USE_STAP_PROBE
+
+# include <sys/sdt.h>
+
+/* Our code uses one macro LIBC_PROBE (name, n, arg1, ..., argn).
+
+ Without USE_STAP_PROBE, that does nothing but evaluates all
+ its arguments (to prevent bit rot, unlike e.g. assert).
+
+ Systemtap's header defines the macros STAP_PROBE (provider, name) and
+ STAP_PROBEn (provider, name, arg1, ..., argn). For "provider" we paste
+ in the IN_LIB name (libc, libpthread, etc.) automagically. */
+
+# ifndef NOT_IN_libc
+# define IN_LIB libc
+# elif !defined IN_LIB
+# error "missing -DIN_LIB=... -- not extra-lib.mk?"
+# endif
+
+# define LIBC_PROBE(name, n, ...) \
+ LIBC_PROBE_1 (IN_LIB, name, n, ## __VA_ARGS__)
+
+# define LIBC_PROBE_1(lib, name, n, ...) \
+ STAP_PROBE##n (lib, name, ## __VA_ARGS__)
+
+# define STAP_PROBE0 STAP_PROBE
+
+# define LIBC_PROBE_ASM(name, template) \
+ STAP_PROBE_ASM (IN_LIB, name, template)
+
+# define LIBC_PROBE_ASM_OPERANDS STAP_PROBE_ASM_OPERANDS
+
+#else /* Not USE_STAP_PROBE. */
+
+# define LIBC_PROBE(name, n, ...) DUMMY_PROBE##n (__VA_ARGS__)
+
+# define LIBC_PROBE_ASM(name, template) /* Nothing. */
+# define LIBC_PROBE_ASM_OPERANDS(n, ...) /* Nothing. */
+
+/* This silliness lets us evaluate all the arguments for each arity
+ of probe. My kingdom for a real macro system. */
+
+# define DUMMY_PROBE0() do {} while (0)
+# define DUMMY_PROBE1(a1) do {} while ((void) (a1), 0)
+# define DUMMY_PROBE2(a1, a2) do {} while ((void) (a1), \
+ (void) (a2), 0)
+# define DUMMY_PROBE3(a1, a2, a3) do {} while ((void) (a1), \
+ (void) (a2), \
+ (void) (a3), 0)
+# define DUMMY_PROBE4(a1, a2, a3, a4) do {} while ((void) (a1), \
+ (void) (a2), \
+ (void) (a3), \
+ (void) (a4), 0)
+# define DUMMY_PROBE5(a1, a2, a3, a4, a5) \
+ do {} while ((void) (a1), \
+ (void) (a2), \
+ (void) (a3), \
+ (void) (a4), \
+ (void) (a5), 0)
+# define DUMMY_PROBE6(a1, a2, a3, a4, a5, a6) \
+ do {} while ((void) (a1), \
+ (void) (a2), \
+ (void) (a3), \
+ (void) (a4), \
+ (void) (a5), \
+ (void) (a6), 0)
+# define DUMMY_PROBE7(a1, a2, a3, a4, a5, a6, a7) \
+ do {} while ((void) (a1), \
+ (void) (a2), \
+ (void) (a3), \
+ (void) (a4), \
+ (void) (a5), \
+ (void) (a6), \
+ (void) (a7), 0)
+# define DUMMY_PROBE8(a1, a2, a3, a4, a5, a6, a7, a8) \
+ do {} while ((void) (a1), \
+ (void) (a2), \
+ (void) (a3), \
+ (void) (a4), \
+ (void) (a5), \
+ (void) (a6), \
+ (void) (a7), \
+ (void) (a8), 0)
+# define DUMMY_PROBE9(a1, a2, a3, a4, a5, a6, a7, a8, a9) \
+ do {} while ((void) (a1), \
+ (void) (a2), \
+ (void) (a3), \
+ (void) (a4), \
+ (void) (a5), \
+ (void) (a6), \
+ (void) (a7), \
+ (void) (a8), \
+ (void) (a9), 0)
+# define DUMMY_PROBE10(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10) \
+ do {} while ((void) (a1), \
+ (void) (a2), \
+ (void) (a3), \
+ (void) (a4), \
+ (void) (a5), \
+ (void) (a6), \
+ (void) (a7), \
+ (void) (a8), \
+ (void) (a9), \
+ (void) (a10), 0)
+
+#endif /* USE_STAP_PROBE. */
+
+#endif /* stap-probe.h */
diff --git a/nptl/ChangeLog b/nptl/ChangeLog
index 802abcd..da1aac7 100644
--- a/nptl/ChangeLog
+++ b/nptl/ChangeLog
@@ -1,3 +1,7 @@
+2010-07-23 Roland McGrath <roland@redhat.com>
+
+ * pthread_create.c (start_thread): Define pthread_start LIBC_PROBE.
+
2011-01-19 Roland McGrath <roland@redhat.com>
* pthread_cond_wait.c (__pthread_cond_wait): Fix comment typo.
diff --git a/nptl/pthread_create.c b/nptl/pthread_create.c
index 34d83f9..4075dd9 100644
--- a/nptl/pthread_create.c
+++ b/nptl/pthread_create.c
@@ -31,6 +31,8 @@
#include <shlib-compat.h>
+#include <stap-probe.h>
+
/* Local function to start thread and handle cleanup. */
static int start_thread (void *arg);
@@ -296,6 +298,8 @@ start_thread (void *arg)
CANCEL_RESET (oldtype);
}
+ LIBC_PROBE (pthread_start, 3, (pthread_t) pd, pd->start_routine, pd->arg);
+
/* Run the code the user provided. */
#ifdef CALL_THREAD_FCT
THREAD_SETMEM (pd, result, CALL_THREAD_FCT (pd));
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