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python3/00055-systemtap.patch
Iryna Shcherbina 695c2fbe5f Rebased to version 3.5.3 
- Removed patches 184, 209, 242 as the changes are already in Python 3.5.3
- Updated patches 55, 146, 170, 180 to work with the new Python codebase
2017-02-01 12:09:30 +01:00

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diff --git a/configure.ac b/configure.ac
index f50a6c8..b0650a5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3277,6 +3277,23 @@ if test "$with_valgrind" != no; then
OPT="-DDYNAMIC_ANNOTATIONS_ENABLED=1 $OPT"
fi
+# Check for systemtap support
+# On Linux, /usr/bin/dtrace is in fact a shim to SystemTap
+AC_MSG_CHECKING([for --with-systemtap])
+AC_ARG_WITH([systemtap],
+ AC_HELP_STRING([--with(out)-systemtap], [disable/enable SystemTap support]),,
+ with_systemtap=no)
+AC_MSG_RESULT([$with_systemtap])
+if test "$with_systemtap" != no; then
+ AC_DEFINE(WITH_SYSTEMTAP, 1,
+ [Define if you want to compile in SystemTap support])
+ SYSTEMTAPOBJS="Python/pysystemtap.o"
+ SYSTEMTAPDEPS="\$(srcdir)/Python/pysystemtap.h"
+fi
+
+AC_SUBST(SYSTEMTAPOBJS)
+AC_SUBST(SYSTEMTAPDEPS)
+
# -I${DLINCLDIR} is added to the compile rule for importdl.o
AC_SUBST(DLINCLDIR)
DLINCLDIR=.
diff --git a/configure b/configure
index 0906ae0..4acd1cd 100755
--- a/configure
+++ b/configure
@@ -642,6 +642,8 @@ TRUE
MACHDEP_OBJS
DYNLOADFILE
DLINCLDIR
+SYSTEMTAPDEPS
+SYSTEMTAPOBJS
THREADOBJ
LDLAST
USE_THREAD_MODULE
@@ -835,6 +837,7 @@ with_doc_strings
with_tsc
with_pymalloc
with_valgrind
+with_systemtap
with_fpectl
with_libm
with_libc
@@ -1540,6 +1543,7 @@ Optional Packages:
--with(out)-tsc enable/disable timestamp counter profile
--with(out)-pymalloc disable/enable specialized mallocs
--with-valgrind Enable Valgrind support
+ --with(out)-systemtap disable/enable SystemTap support
--with-fpectl enable SIGFPE catching
--with-libm=STRING math library
--with-libc=STRING C library
@@ -11181,6 +11185,31 @@ fi
OPT="-DDYNAMIC_ANNOTATIONS_ENABLED=1 $OPT"
fi
+# Check for systemtap support
+# On Linux, /usr/bin/dtrace is in fact a shim to SystemTap
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for --with-systemtap" >&5
+$as_echo_n "checking for --with-systemtap... " >&6; }
+
+# Check whether --with-systemtap was given.
+if test "${with_systemtap+set}" = set; then :
+ withval=$with_systemtap;
+else
+ with_systemtap=no
+fi
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_systemtap" >&5
+$as_echo "$with_systemtap" >&6; }
+if test "$with_systemtap" != no; then
+
+$as_echo "#define WITH_SYSTEMTAP 1" >>confdefs.h
+
+ SYSTEMTAPOBJS="Python/pysystemtap.o"
+ SYSTEMTAPDEPS="\$(srcdir)/Python/pysystemtap.h"
+fi
+
+
+
+
# -I${DLINCLDIR} is added to the compile rule for importdl.o
DLINCLDIR=.
diff --git a/Doc/howto/index.rst b/Doc/howto/index.rst
index de65950..593341c 100644
--- a/Doc/howto/index.rst
+++ b/Doc/howto/index.rst
@@ -28,4 +28,5 @@ Currently, the HOWTOs are:
argparse.rst
ipaddress.rst
clinic.rst
+ instrumentation.rst
diff --git a/Doc/howto/instrumentation.rst b/Doc/howto/instrumentation.rst
new file mode 100644
index 0000000..b6924e1
--- /dev/null
+++ b/Doc/howto/instrumentation.rst
@@ -0,0 +1,295 @@
+.. _instrumentation:
+
+====================================
+Instrumenting CPython with SystemTap
+====================================
+
+:author: David Malcolm <dmalcolm@redhat.com>
+
+DTrace and SystemTap are monitoring tools, each providing a way to inspect
+what the processes on a computer system are doing. They both use
+domain-specific languages allowing a user to write scripts which:
+
+ - filter which processes are to be observed
+ - gather data from the processes of interest
+ - generate reports on the data
+
+As of Python 3.3, CPython can be built with embedded "markers" that can be
+observed by a SystemTap script, making it easier to monitor what the CPython
+processes on a system are doing.
+
+.. Potentially this document could be expanded to also cover DTrace markers.
+ However, I'm not a DTrace expert.
+
+.. I'm using ".. code-block:: c" for SystemTap scripts, as "c" is syntactically
+ the closest match that Sphinx supports
+
+
+Enabling the static markers
+---------------------------
+
+In order to build CPython with the embedded markers for SystemTap, the
+SystemTap development tools must be installed.
+
+On a Fedora or Red Hat Enterprise Linux machine, this can be done via::
+
+ yum install systemtap-sdt-devel
+
+CPython must then be configured `--with-systemtap`::
+
+ checking for --with-systemtap... yes
+
+You can verify if the SystemTap static markers are present in the built
+binary by seeing if it contains a ".note.stapsdt" section.
+
+.. code-block:: bash
+
+ $ eu-readelf -S ./python | grep .note.stapsdt
+ [29] .note.stapsdt NOTE 0000000000000000 00308d78 000000b8 0 0 0 4
+
+If you've built python as a shared library (with --enable-shared), you need
+to look instead within the shared library. For example:
+
+.. code-block:: bash
+
+ $ eu-readelf -S libpython3.3dm.so.1.0 | grep .note.stapsdt
+ [28] .note.stapsdt NOTE 0000000000000000 00365b68 000000b8 0 0 0 4
+
+Earlier versions of SystemTap stored the markers in a ".probes" section.
+
+For the curious, you can see the metadata for the static markers using this
+invocation.
+
+.. code-block:: bash
+
+ $ eu-readelf -x .note.stapsdt ./python
+
+ Hex dump of section [29] '.note.stapsdt', 184 bytes at offset 0x308d78:
+ 0x00000000 08000000 45000000 03000000 73746170 ....E.......stap
+ 0x00000010 73647400 d4664b00 00000000 4fc36600 sdt..fK.....O.f.
+ 0x00000020 00000000 488d9000 00000000 70797468 ....H.......pyth
+ 0x00000030 6f6e0066 756e6374 696f6e5f 5f656e74 on.function__ent
+ 0x00000040 72790038 40257261 78203840 25726478 ry.8@%rax 8@%rdx
+ 0x00000050 202d3440 25656378 00000000 08000000 -4@%ecx........
+ 0x00000060 46000000 03000000 73746170 73647400 F.......stapsdt.
+ 0x00000070 0d674b00 00000000 4fc36600 00000000 .gK.....O.f.....
+ 0x00000080 4a8d9000 00000000 70797468 6f6e0066 J.......python.f
+ 0x00000090 756e6374 696f6e5f 5f726574 75726e00 unction__return.
+ 0x000000a0 38402572 61782038 40257264 78202d34 8@%rax 8@%rdx -4
+ 0x000000b0 40256563 78000000 @%ecx...
+
+and a sufficiently modern eu-readelf can print the metadata:
+
+.. code-block:: bash
+
+ $ eu-readelf -n ./python
+
+ Note section [ 1] '.note.gnu.build-id' of 36 bytes at offset 0x190:
+ Owner Data size Type
+ GNU 20 GNU_BUILD_ID
+ Build ID: a28f8db1b224530b0d38ad7b82a249cf7c3f18d6
+
+ Note section [27] '.note.stapsdt' of 184 bytes at offset 0x1ae884:
+ Owner Data size Type
+ stapsdt 70 Version: 3
+ PC: 0xe0d3a, Base: 0x14b150, Semaphore: 0x3ae882
+ Provider: python, Name: function__return, Args: '8@%rbx 8@%r13 -4@%eax'
+ stapsdt 69 Version: 3
+ PC: 0xe0f37, Base: 0x14b150, Semaphore: 0x3ae880
+ Provider: python, Name: function__entry, Args: '8@%rbx 8@%r13 -4@%eax'
+
+The above metadata contains information for SystemTap describing how it can
+patch strategically-placed machine code instructions to enable the tracing
+hooks used by a SystemTap script.
+
+
+Static markers
+--------------
+
+The low-level way to use the SystemTap integration is to use the static
+markers directly. This requires you to explicitly state the binary file
+containing them.
+
+For example, this script can be used to show the call/return hierarchy of a
+Python script:
+
+.. code-block:: c
+
+ probe process('python').mark("function__entry") {
+ filename = user_string($arg1);
+ funcname = user_string($arg2);
+ lineno = $arg3;
+
+ printf("%s => %s in %s:%d\\n",
+ thread_indent(1), funcname, filename, lineno);
+ }
+
+ probe process('python').mark("function__return") {
+ filename = user_string($arg1);
+ funcname = user_string($arg2);
+ lineno = $arg3;
+
+ printf("%s <= %s in %s:%d\\n",
+ thread_indent(-1), funcname, filename, lineno);
+ }
+
+It can be invoked like this:
+
+.. code-block:: bash
+
+ $ stap \
+ show-call-hierarchy.stp \
+ -c ./python test.py
+
+The output looks like this::
+
+ 11408 python(8274): => __contains__ in Lib/_abcoll.py:362
+ 11414 python(8274): => __getitem__ in Lib/os.py:425
+ 11418 python(8274): => encode in Lib/os.py:490
+ 11424 python(8274): <= encode in Lib/os.py:493
+ 11428 python(8274): <= __getitem__ in Lib/os.py:426
+ 11433 python(8274): <= __contains__ in Lib/_abcoll.py:366
+
+where the columns are:
+
+ - time in microseconds since start of script
+
+ - name of executable
+
+ - PID of process
+
+and the remainder indicates the call/return hierarchy as the script executes.
+
+For a `--enable-shared` build of CPython, the markers are contained within the
+libpython shared library, and the probe's dotted path needs to reflect this. For
+example, this line from the above example::
+
+ probe process('python').mark("function__entry") {
+
+should instead read::
+
+ probe process('python').library("libpython3.3dm.so.1.0").mark("function__entry") {
+
+(assuming a debug build of CPython 3.3)
+
+.. I'm reusing the "c:function" type for markers
+
+.. c:function:: function__entry(str filename, str funcname, int lineno)
+
+ This marker indicates that execution of a Python function has begun. It is
+ only triggered for pure-python (bytecode) functions.
+
+ The filename, function name, and line number are provided back to the
+ tracing script as positional arguments, which must be accessed using
+ `$arg1`, `$arg2`:
+
+ * `$arg1` : `(const char *)` filename, accessible using `user_string($arg1)`
+
+ * `$arg2` : `(const char *)` function name, accessible using
+ `user_string($arg2)`
+
+ * `$arg3` : `int` line number
+
+ * `$arg4` : `(PyFrameObject *)`, the frame being executed
+
+.. c:function:: function__return(str filename, str funcname, int lineno)
+
+ This marker is the converse of `function__entry`, and indicates that
+ execution of a Python function has ended (either via ``return``, or via an
+ exception). It is only triggered for pure-python (bytecode) functions.
+
+ The arguments are the same as for `function__entry`
+
+
+Tapsets
+-------
+
+The higher-level way to use the SystemTap integration is to use a "tapset":
+SystemTap's equivalent of a library, which hides some of the lower-level
+details of the static markers.
+
+Here is a tapset file, based on a non-shared build of CPython:
+
+.. code-block:: c
+
+ /*
+ Provide a higher-level wrapping around the function__entry and
+ function__return markers:
+ */
+ probe python.function.entry = process("python").mark("function__entry")
+ {
+ filename = user_string($arg1);
+ funcname = user_string($arg2);
+ lineno = $arg3;
+ frameptr = $arg4
+ }
+ probe python.function.return = process("python").mark("function__return")
+ {
+ filename = user_string($arg1);
+ funcname = user_string($arg2);
+ lineno = $arg3;
+ frameptr = $arg4
+ }
+
+If this file is installed in SystemTap's tapset directory (e.g.
+`/usr/share/systemtap/tapset`), then these additional probepoints become
+available:
+
+.. c:function:: python.function.entry(str filename, str funcname, int lineno, frameptr)
+
+ This probe point indicates that execution of a Python function has begun.
+ It is only triggered for pure-python (bytecode) functions.
+
+.. c:function:: python.function.return(str filename, str funcname, int lineno, frameptr)
+
+ This probe point is the converse of `python.function.return`, and indicates
+ that execution of a Python function has ended (either via ``return``, or
+ via an exception). It is only triggered for pure-python (bytecode) functions.
+
+
+Examples
+--------
+This SystemTap script uses the tapset above to more cleanly implement the
+example given above of tracing the Python function-call hierarchy, without
+needing to directly name the static markers:
+
+.. code-block:: c
+
+ probe python.function.entry
+ {
+ printf("%s => %s in %s:%d\n",
+ thread_indent(1), funcname, filename, lineno);
+ }
+
+ probe python.function.return
+ {
+ printf("%s <= %s in %s:%d\n",
+ thread_indent(-1), funcname, filename, lineno);
+ }
+
+
+The following script uses the tapset above to provide a top-like view of all
+running CPython code, showing the top 20 most frequently-entered bytecode
+frames, each second, across the whole system:
+
+.. code-block:: c
+
+ global fn_calls;
+
+ probe python.function.entry
+ {
+ fn_calls[pid(), filename, funcname, lineno] += 1;
+ }
+
+ probe timer.ms(1000) {
+ printf("\033[2J\033[1;1H") /* clear screen */
+ printf("%6s %80s %6s %30s %6s\n",
+ "PID", "FILENAME", "LINE", "FUNCTION", "CALLS")
+ foreach ([pid, filename, funcname, lineno] in fn_calls- limit 20) {
+ printf("%6d %80s %6d %30s %6d\n",
+ pid, filename, lineno, funcname,
+ fn_calls[pid, filename, funcname, lineno]);
+ }
+ delete fn_calls;
+ }
+
diff --git a/Lib/test/test_systemtap.py b/Lib/test/test_systemtap.py
new file mode 100644
index 0000000..a669064
--- /dev/null
+++ b/Lib/test/test_systemtap.py
@@ -0,0 +1,234 @@
+# Verify that systemtap static probes work
+#
+import subprocess
+import sys
+import sysconfig
+import os
+import unittest
+
+from test.support import run_unittest, TESTFN, unlink
+
+if '--with-systemtap' not in sysconfig.get_config_var('CONFIG_ARGS'):
+ raise unittest.SkipTest("Python was not configured --with-systemtap")
+
+try:
+ _, stap_version = subprocess.Popen(["stap", "-V"],
+ stdout=subprocess.PIPE,
+ stderr=subprocess.PIPE,
+ ).communicate()
+except OSError:
+ # This is what "no stap" looks like. There may, however, be other
+ # errors that manifest this way too.
+ raise unittest.SkipTest("Couldn't find stap on the path")
+
+def invoke_systemtap_script(script, cmd):
+ # Start a child process, probing with the given systemtap script
+ # (passed as stdin to the "stap" tool)
+ # The script should be a bytes instance
+ # Return (stdout, stderr) pair
+
+ p = subprocess.Popen(["stap", "-", '-vv', '-c', cmd],
+ stdin=subprocess.PIPE,
+ stdout=subprocess.PIPE,
+ stderr=subprocess.PIPE)
+ out, err = p.communicate(input=script)
+ return out, err
+
+# Verify that stap can run a simple "hello world"-style script
+# This can fail for various reasons:
+# - missing kernel headers
+# - permissions (a non-root user needs to be in the "stapdev" group)
+TRIVIAL_STAP_SCRIPT = b'probe begin { println("hello world") exit () }'
+
+out, err = invoke_systemtap_script(TRIVIAL_STAP_SCRIPT, 'true')
+if out != b'hello world\n':
+ raise unittest.SkipTest("Test systemtap script did not run; stderr was: %s" % err)
+
+# We don't expect stderr to be empty, since we're invoking stap with "-vv": stap
+# will (we hope) generate debugging output on stderr.
+
+def invoke_python_under_systemtap(script, pythoncode=None, pythonfile=None):
+ # Start a child python process, probing with the given systemtap script
+ # (passed as stdin to the "stap" tool)
+ # The script should be a bytes instance
+ # Return (stdout, stderr) pair
+
+ if pythonfile:
+ pythoncmd = '%s %s' % (sys.executable, pythonfile)
+ else:
+ pythoncmd = '%s -c %r' % (sys.executable, pythoncode)
+
+ # The process tree of a stap invocation of a command goes through
+ # something like this:
+ # stap ->fork/exec(staprun; exec stapio ->f/e(-c cmd); exec staprun -r)
+ # and this trip through setuid leads to LD_LIBRARY_PATH being dropped,
+ # which would lead to an --enable-shared build of python failing to be
+ # find its libpython, with an error like:
+ # error while loading shared libraries: libpython3.3dm.so.1.0: cannot
+ # open shared object file: No such file or directory
+ # Hence we need to jump through some hoops to expose LD_LIBRARY_PATH to
+ # the invoked python process:
+ LD_LIBRARY_PATH = os.environ.get('LD_LIBRARY_PATH', '')
+ if LD_LIBRARY_PATH:
+ pythoncmd = 'env LD_LIBRARY_PATH=%s ' % LD_LIBRARY_PATH + pythoncmd
+
+ return invoke_systemtap_script(script, pythoncmd)
+
+# When using the static markers, we need to supply the prefix of a systemtap
+# dotted probe point that containing the marker.
+# See http://sourceware.org/systemtap/langref/Probe_points.html
+#
+# We need to determine if this is a shared-library build
+#
+# Note that sysconfig can get this wrong; see:
+# http://bugs.python.org/issue14774
+#
+if '--enable-shared' in sysconfig.get_config_var('CONFIG_ARGS'):
+ # For a shared-library build, the markers are in library(INSTSONAME):
+ INSTSONAME = sysconfig.get_config_var('INSTSONAME')
+ probe_prefix = 'process("%s").library("%s")' % (sys.executable, INSTSONAME)
+else:
+ # For a non-shared-library build, we can simply use sys.executable:
+ probe_prefix = 'process("%s")' % sys.executable
+
+# The following script ought to generate lots of lines showing recursive
+# function entry and return, of the form:
+# 11408 python(8274): => __contains__ in Lib/_abcoll.py:362
+# 11414 python(8274): => __getitem__ in Lib/os.py:425
+# 11418 python(8274): => encode in Lib/os.py:490
+# 11424 python(8274): <= encode in Lib/os.py:493
+# 11428 python(8274): <= __getitem__ in Lib/os.py:426
+# 11433 python(8274): <= __contains__ in Lib/_abcoll.py:366
+# where the column are:
+# - time in microseconds since start of script
+# - name of executable
+# - PID of process
+# and the remainder indicates the call/return hierarchy
+
+hierarchy_script = ('''
+probe %s.mark("function__entry") {
+ filename = user_string($arg1);
+ funcname = user_string($arg2);
+ lineno = $arg3;
+
+ printf("%%s => %%s in %%s:%%d\\n", thread_indent(1), funcname, filename, lineno);
+}
+
+probe %s.mark("function__return") {
+ filename = user_string($arg1);
+ funcname = user_string($arg2);
+ lineno = $arg3;
+
+ printf("%%s <= %%s in %%s:%%d\\n", thread_indent(-1), funcname, filename, lineno);
+}
+''' % (probe_prefix, probe_prefix)).encode('utf-8')
+
+
+class ErrorDumper:
+ # A context manager that dumps extra information if an exception is raised,
+ # to help track down why the problem occurred
+ def __init__(self, out, err):
+ self.out = out
+ self.err = err
+
+ def __enter__(self):
+ pass
+
+ def __exit__(self, type_, value, traceback):
+ if type_:
+ # an exception is being raised:
+ print('stdout: %s' % out.decode())
+ print('stderr: %s' % err.decode())
+
+class SystemtapTests(unittest.TestCase):
+
+ def test_invoking_python(self):
+ # Ensure that we can invoke python under stap, with a trivial stap
+ # script:
+ out, err = invoke_python_under_systemtap(
+ b'probe begin { println("hello from stap") exit () }',
+ pythoncode="print('hello from python')")
+ with ErrorDumper(out, err):
+ self.assertIn(b'hello from stap', out)
+ self.assertIn(b'hello from python', out)
+
+ def test_function_entry(self):
+ # Ensure that the function_entry static marker works
+ out, err = invoke_python_under_systemtap(hierarchy_script)
+ # stdout ought to contain various lines showing recursive function
+ # entry and return (see above)
+
+ # Uncomment this for debugging purposes:
+ # print(out.decode('utf-8'))
+
+ # Executing the cmdline-supplied "pass":
+ # 0 python(8274): => <module> in <string>:1
+ # 5 python(8274): <= <module> in <string>:1
+ with ErrorDumper(out, err):
+ self.assertIn(b'=> <module> in <string>:1', out,
+ msg="stdout: %s\nstderr: %s\n" % (out, err))
+
+ def test_function_encoding(self):
+ # Ensure that function names containing non-Latin 1 code
+ # points are handled:
+ pythonfile = TESTFN
+ try:
+ unlink(pythonfile)
+ f = open(pythonfile, "wb")
+ f.write("""
+# Sample script with non-ASCII filename, for use by test_systemtap.py
+# Implicitly UTF-8
+
+def 文字化け():
+ '''Function with non-ASCII identifier; I believe this reads "mojibake"'''
+ print("hello world!")
+
+文字化け()
+""".encode('utf-8'))
+ f.close()
+
+ out, err = invoke_python_under_systemtap(hierarchy_script,
+ pythonfile=pythonfile)
+ out_utf8 = out.decode('utf-8')
+ with ErrorDumper(out, err):
+ self.assertIn('=> <module> in %s:5' % pythonfile, out_utf8)
+ self.assertIn(' => 文字化け in %s:5' % pythonfile, out_utf8)
+ self.assertIn(' <= 文字化け in %s:7' % pythonfile, out_utf8)
+ self.assertIn('<= <module> in %s:9' % pythonfile, out_utf8)
+ finally:
+ unlink(pythonfile)
+
+ @unittest.skipIf(sys.getfilesystemencoding() == 'ascii',
+ 'the test filename is not encodable with ASCII')
+ def test_filename_encoding(self):
+ # Ensure that scripts names containing non-Latin 1 code
+ # points are handled:
+ pythonfile = TESTFN + '_☠.py'
+ try:
+ unlink(pythonfile)
+ f = open(pythonfile, "wb")
+ f.write("""
+def foo():
+ '''Function with non-ASCII identifier; I believe this reads "mojibake"'''
+ print("hello world!")
+
+foo()
+""".encode('utf-8'))
+ f.close()
+
+ out, err = invoke_python_under_systemtap(hierarchy_script,
+ pythonfile=pythonfile)
+ out_utf8 = out.decode('utf-8')
+ with ErrorDumper(out, err):
+ self.assertIn('=> <module> in %s:2' % pythonfile, out_utf8)
+ self.assertIn(' => foo in %s:2' % pythonfile, out_utf8)
+ self.assertIn(' <= foo in %s:4' % pythonfile, out_utf8)
+ self.assertIn('<= <module> in %s:6' % pythonfile, out_utf8)
+ finally:
+ unlink(pythonfile)
+
+def test_main():
+ run_unittest(SystemtapTests)
+
+if __name__ == "__main__":
+ test_main()
diff --git a/Makefile.pre.in b/Makefile.pre.in
index a88b7d5..3585b88 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -415,6 +415,7 @@ PYTHON_OBJS= \
Python/formatter_unicode.o \
Python/fileutils.o \
Python/$(DYNLOADFILE) \
+ @SYSTEMTAPOBJS@ \
$(LIBOBJS) \
$(MACHDEP_OBJS) \
$(THREADOBJ)
@@ -868,7 +869,8 @@ Objects/setobject.o: $(srcdir)/Objects/stringlib/eq.h
$(OPCODETARGETS_H): $(OPCODETARGETGEN_FILES)
$(PYTHON_FOR_GEN) $(OPCODETARGETGEN) $(OPCODETARGETS_H)
-Python/ceval.o: $(OPCODETARGETS_H) $(srcdir)/Python/ceval_gil.h
+Python/ceval.o: $(OPCODETARGETS_H) $(srcdir)/Python/ceval_gil.h \
+ $(srcdir)/Python/ceval_systemtap.h @SYSTEMTAPDEPS@
Python/frozen.o: Python/importlib.h Python/importlib_external.h
@@ -876,6 +878,13 @@ Objects/typeobject.o: Objects/typeslots.inc
Objects/typeslots.inc: $(srcdir)/Include/typeslots.h $(srcdir)/Objects/typeslots.py
$(PYTHON_FOR_GEN) $(srcdir)/Objects/typeslots.py < $(srcdir)/Include/typeslots.h Objects/typeslots.inc
+# Only needed with --with-systemtap; not a public header:
+$(srcdir)/Python/pysystemtap.h: $(srcdir)/Python/pysystemtap.d
+ dtrace -o $@ $(DFLAGS) -C -h -s $(srcdir)/Python/pysystemtap.d
+
+Python/pysystemtap.o: $(srcdir)/Python/pysystemtap.d Python/ceval.o
+ dtrace -o $@ $(DFLAGS) -C -G -s $(srcdir)/Python/pysystemtap.d Python/ceval.o
+
############################################################################
# Header files
@@ -1597,6 +1606,7 @@ clean: pycremoval
-rm -f Lib/lib2to3/*Grammar*.pickle
-rm -f Programs/_testembed Programs/_freeze_importlib
-find build -type f -a ! -name '*.gc??' -exec rm -f {} ';'
+ -rm -f $(srcdir)/Python/pysystemtap.h
profile-removal:
find . -name '*.gc??' -exec rm -f {} ';'
diff --git a/pyconfig.h.in b/pyconfig.h.in
index 39ccf53..9052dbc 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -1375,6 +1375,9 @@
/* Define if you want to compile in Python-specific mallocs */
#undef WITH_PYMALLOC
+/* Define if you want to compile in SystemTap support */
+#undef WITH_SYSTEMTAP
+
/* Define if you want to compile in rudimentary thread support */
#undef WITH_THREAD
diff --git a/Python/ceval.c b/Python/ceval.c
index 7b40518..0e49de5 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -20,6 +20,8 @@
#include <ctype.h>
+#include "ceval_systemtap.h"
+
#ifndef WITH_TSC
#define READ_TIMESTAMP(var)
@@ -1160,6 +1162,10 @@ PyEval_EvalFrameEx(PyFrameObject *f, int throwflag)
}
}
+ if (PYTHON_FUNCTION_ENTRY_ENABLED()) {
+ systemtap_function_entry(f);
+ }
+
co = f->f_code;
names = co->co_names;
consts = co->co_consts;
@@ -3640,6 +3646,11 @@ fast_yield:
/* pop frame */
exit_eval_frame:
+
+ if (PYTHON_FUNCTION_RETURN_ENABLED()) {
+ systemtap_function_return(f);
+ }
+
Py_LeaveRecursiveCall();
f->f_executing = 0;
tstate->frame = f->f_back;
diff --git a/Python/ceval_systemtap.h b/Python/ceval_systemtap.h
new file mode 100644
index 0000000..38697ad
--- /dev/null
+++ b/Python/ceval_systemtap.h
@@ -0,0 +1,86 @@
+/*
+ Support for SystemTap static markers
+*/
+
+#ifdef WITH_SYSTEMTAP
+
+#include "pysystemtap.h"
+
+/*
+ A struct to hold all of the information gathered when one of the traceable
+ markers is triggered
+*/
+struct frame_marker_info
+{
+ PyObject *filename_obj;
+ PyObject *funcname_obj;
+ const char *filename;
+ const char *funcname;
+ int lineno;
+};
+
+static void
+get_frame_marker_info(PyFrameObject *f, struct frame_marker_info *fmi)
+{
+ PyObject *ptype;
+ PyObject *pvalue;
+ PyObject *ptraceback;
+
+ PyErr_Fetch(&ptype, &pvalue, &ptraceback);
+
+ fmi->filename_obj = PyUnicode_EncodeFSDefault(f->f_code->co_filename);
+ if (fmi->filename_obj) {
+ fmi->filename = PyBytes_AsString(fmi->filename_obj);
+ } else {
+ fmi->filename = NULL;
+ }
+
+ fmi->funcname_obj = PyUnicode_AsUTF8String(f->f_code->co_name);
+ if (fmi->funcname_obj) {
+ fmi->funcname = PyBytes_AsString(fmi->funcname_obj);
+ } else {
+ fmi->funcname = NULL;
+ }
+
+ fmi->lineno = PyCode_Addr2Line(f->f_code, f->f_lasti);
+
+ PyErr_Restore(ptype, pvalue, ptraceback);
+
+}
+
+static void
+release_frame_marker_info(struct frame_marker_info *fmi)
+{
+ Py_XDECREF(fmi->filename_obj);
+ Py_XDECREF(fmi->funcname_obj);
+}
+
+static void
+systemtap_function_entry(PyFrameObject *f)
+{
+ struct frame_marker_info fmi;
+ get_frame_marker_info(f, &fmi);
+ PYTHON_FUNCTION_ENTRY(fmi.filename, fmi.funcname, fmi.lineno, f);
+ release_frame_marker_info(&fmi);
+}
+
+static void
+systemtap_function_return(PyFrameObject *f)
+{
+ struct frame_marker_info fmi;
+ get_frame_marker_info(f, &fmi);
+ PYTHON_FUNCTION_RETURN(fmi.filename, fmi.funcname, fmi.lineno, f);
+ release_frame_marker_info(&fmi);
+}
+
+#else /* #ifdef WITH_SYSTEMTAP */
+
+/*
+ When configured --without-systemtap, everything compiles away to nothing:
+*/
+#define PYTHON_FUNCTION_ENTRY_ENABLED() 0
+#define PYTHON_FUNCTION_RETURN_ENABLED() 0
+#define systemtap_function_entry(f)
+#define systemtap_function_return(f)
+
+#endif
diff --git a/Python/pysystemtap.d b/Python/pysystemtap.d
new file mode 100644
index 0000000..c2cdef0
--- /dev/null
+++ b/Python/pysystemtap.d
@@ -0,0 +1,4 @@
+provider python {
+ probe function__entry(const char *, const char *, int, PyFrameObject *);
+ probe function__return(const char *, const char *, int, PyFrameObject *);
+};
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