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src: rewrite systemtap probe generator in Python
As part of a goal to eliminate Perl from libvirt build tools, rewrite the dtrace2systemtap.pl tool in Python. This was a straight conversion, manually going line-by-line to change the syntax from Perl to Python. Thus the overall structure of the file and approach is the same. The "--with-modules" flag was dropped because this functionality is not implicitly always enabled. Tested-by: Cole Robinson <crobinso@redhat.com> Reviewed-by: Ján Tomko <jtomko@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrangé
parent
d30a1ad044
commit
952c018efe
@ -50,6 +50,7 @@ EXTRA_DIST = \
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scripts/check-aclperms.py \
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scripts/check-symfile.py \
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scripts/check-symsorting.py \
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scripts/dtrace2systemtap.py \
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scripts/header-ifdef.py \
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scripts/minimize-po.py \
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scripts/mock-noinline.py \
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143
scripts/dtrace2systemtap.py
Executable file
143
scripts/dtrace2systemtap.py
Executable file
@ -0,0 +1,143 @@
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#!/usr/bin/env python
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#
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# Copyright (C) 2011-2019 Red Hat, Inc.
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library. If not, see
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# <http://www.gnu.org/licenses/>.
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#
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#
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# Generate a set of systemtap probe definitions corresponding to
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# DTrace probe markers in libvirt.so
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#
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# python dtrace2systemtap.py probes.d > libvirt_probes.stp
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#
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from __future__ import print_function
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import re
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import sys
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file = None
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filelist = []
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files = {}
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bindir = sys.argv[1]
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sbindir = sys.argv[2]
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libdir = sys.argv[3]
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dtrace = sys.argv[4]
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probe = None
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args = None
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# Read the DTraceprobes definition
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with open(dtrace, "r") as fh:
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lineno = 0
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for line in fh:
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lineno = lineno + 1
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line = line.strip()
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if line == "":
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continue
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if line.find("provider ") != -1 and line.find("{") != -1:
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continue
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if line.find("};") != -1:
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continue
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if line.startswith("#"):
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m = re.search(r'''^\#\s*file:\s*(\S+)$''', line)
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if m is not None:
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file = m.group(1)
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filelist.append(file)
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files[file] = {"prefix": None, "probes": []}
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continue
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m = re.search(r'''^\#\s*prefix:\s*(\S+)$''', line)
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if m is not None:
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files[file]["prefix"] = m.group(1)
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continue
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m = re.search(r'''^\#\s*binary:\s*(\S+)$''', line)
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if m is not None:
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files[file]["binary"] = m.group(1)
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continue
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m = re.search(r'''^\#\s*module:\s*(\S+)$''', line)
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if m is not None:
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files[file]["module"] = m.group(1)
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# ignore unknown comments
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else:
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m = re.search(r'''probe\s+([a-zA-Z0-9_]+)\((.*?)(\);)?$''', line)
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if m is not None:
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probe = m.group(1)
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args = m.group(2)
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if m.group(3) is not None:
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files[file]["probes"].append([probe, args])
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probe = None
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args = None
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elif probe is not None:
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m = re.search(r'''^(.*?)(\);)?$''', line)
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if m is not None:
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args = args + m.group(1)
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if m.group(2) is not None:
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files[file]["probes"].append([probe, args])
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probe = None
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args = None
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else:
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raise Exception("unexpected data %s on line %d" %
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(line, lineno))
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else:
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raise Exception("unexpected data %s on line %d" %
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(line, lineno))
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# Write out the SystemTap probes
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for file in filelist:
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prefix = files[file]["prefix"]
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probes = files[file]["probes"]
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print("# %s\n" % file)
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for probe in probes:
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name = probe[0]
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args = probe[1]
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pname = name.replace(prefix + "_", "libvirt." + prefix + ".")
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binary = libdir + "/libvirt.so"
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if "binary" in files[file]:
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binary = sbindir + "/" + files[file]["binary"]
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if "module" in files[file]:
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binary = libdir + "/" + files[file]["module"]
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print("probe %s = process(\"%s\").mark(\"%s\") {" %
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(pname, binary, name))
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argbits = args.split(",")
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for idx in range(len(argbits)):
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arg = argbits[idx]
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isstr = False
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if arg.find("char *") != -1:
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isstr = True
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m = re.search(r'''^.*\s\*?(\S+)$''', arg)
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if m is not None:
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arg = m.group(1)
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else:
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raise Exception("Malformed arg %s" % arg)
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if isstr:
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print(" %s = user_string($arg%d);" % (arg, idx + 1))
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else:
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print(" %s = $arg%d;" % (arg, idx + 1))
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print("}\n")
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print("")
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@ -527,7 +527,6 @@ if WITH_DTRACE_PROBES
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libvirt_la_BUILT_LIBADD += libvirt_probes.lo
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libvirt_la_DEPENDENCIES += libvirt_probes.lo libvirt_probes.o
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nodist_libvirt_la_SOURCES = libvirt_probes.h
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DTRACE2SYSTEMTAP_FLAGS = --with-modules
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BUILT_SOURCES += libvirt_probes.h libvirt_probes.stp libvirt_functions.stp
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@ -562,10 +561,10 @@ RPC_PROBE_FILES += $(srcdir)/rpc/virnetprotocol.x \
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libvirt_functions.stp: $(RPC_PROBE_FILES) $(srcdir)/rpc/gensystemtap.pl
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$(AM_V_GEN)$(PERL) -w $(srcdir)/rpc/gensystemtap.pl $(RPC_PROBE_FILES) > $@
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%_probes.stp: %_probes.d $(srcdir)/dtrace2systemtap.pl \
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%_probes.stp: %_probes.d $(top_srcdir)/scripts/dtrace2systemtap.py \
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$(top_builddir)/config.status
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$(AM_V_GEN)$(PERL) -w $(srcdir)/dtrace2systemtap.pl \
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$(DTRACE2SYSTEMTAP_FLAGS) $(bindir) $(sbindir) $(libdir) $< > $@
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$(AM_V_GEN)$(RUNUTF8) $(PYTHON) $(top_srcdir)/scripts/dtrace2systemtap.py \
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$(bindir) $(sbindir) $(libdir) $< > $@
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CLEANFILES += libvirt_probes.h libvirt_probes.o libvirt_probes.lo \
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libvirt_functions.stp libvirt_probes.stp
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@ -686,9 +685,6 @@ endif LIBVIRT_INIT_SCRIPT_SYSTEMD
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endif WITH_LIBVIRTD
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EXTRA_DIST += dtrace2systemtap.pl
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if WITH_LIBVIRTD
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libexec_PROGRAMS += libvirt_iohelper
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libvirt_iohelper_SOURCES = $(UTIL_IO_HELPER_SOURCES)
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@ -1,130 +0,0 @@
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#!/usr/bin/env perl
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#
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# Copyright (C) 2011-2012 Red Hat, Inc.
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library. If not, see
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# <http://www.gnu.org/licenses/>.
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#
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#
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# Generate a set of systemtap probe definitions corresponding to
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# DTrace probe markers in libvirt.so
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#
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# perl dtrace2systemtap.pl probes.d > libvirt_probes.stp
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#
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use strict;
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use warnings;
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my $file;
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my @files;
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my %files;
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my $with_modules = 0;
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if ($ARGV[0] eq "--with-modules") {
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# set if we want to honor the "module" setting in the .d file
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$with_modules = 1;
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shift @ARGV;
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}
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my $bindir = shift @ARGV;
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my $sbindir = shift @ARGV;
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my $libdir = shift @ARGV;
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my $probe;
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my $args;
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# Read the DTraceprobes definition
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while (<>) {
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next if m,^\s*$,;
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next if /^\s*provider\s+\w+\s*{\s*$/;
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next if /^\s*};\s*$/;
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if (m,^\s*\#,) {
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if (m,^\s*\#\s*file:\s*(\S+)\s*$,) {
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$file = $1;
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push @files, $file;
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$files{$file} = { prefix => undef, probes => [] };
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} elsif (m,^\s*\#\s*prefix:\s*(\S+)\s*$,) {
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$files{$file}->{prefix} = $1;
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} elsif (m,^\s*\#\s*binary:\s*(\S+)\s*$,) {
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$files{$file}->{binary} = $1;
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} elsif (m,^\s*\#\s*module:\s*(\S+)\s*$,) {
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$files{$file}->{module} = $1;
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} else {
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# ignore unknown comments
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}
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} else {
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if (m,\s*probe\s+([a-zA-Z0-9_]+)\((.*?)(\);)?$,) {
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$probe = $1;
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$args = $2;
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if ($3) {
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push @{$files{$file}->{probes}}, [$probe, $args];
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$probe = $args = undef;
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}
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} elsif ($probe) {
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if (m,^(.*?)(\);)?$,) {
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$args .= $1;
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if ($2) {
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push @{$files{$file}->{probes}}, [$probe, $args];
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$probe = $args = undef;
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}
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} else {
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die "unexpected data $_ on line $.";
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}
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} else {
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die "unexpected data $_ on line $.";
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}
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}
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}
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# Write out the SystemTap probes
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foreach my $file (@files) {
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my $prefix = $files{$file}->{prefix};
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my @probes = @{$files{$file}->{probes}};
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print "# $file\n\n";
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foreach my $probe (@probes) {
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my $name = $probe->[0];
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my $args = $probe->[1];
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my $pname = $name;
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$pname =~ s/${prefix}_/libvirt.$prefix./;
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my $binary = "$libdir/libvirt.so";
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if (exists $files{$file}->{binary}) {
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$binary = $sbindir . "/" . $files{$file}->{binary};
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}
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if ($with_modules && exists $files{$file}->{module}) {
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$binary = $libdir . "/" . $files{$file}->{module};
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}
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print "probe $pname = process(\"$binary\").mark(\"$name\") {\n";
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my @args = split /,/, $args;
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for (my $i = 0 ; $i <= $#args ; $i++) {
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my $arg = $args[$i];
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my $isstr = $arg =~ /char\s+\*/;
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$arg =~ s/^.*\s\*?(\S+)$/$1/;
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if ($isstr) {
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print " $arg = user_string(\$arg", $i + 1, ");\n";
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} else {
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print " $arg = \$arg", $i + 1, ";\n";
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}
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}
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print "}\n\n";
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}
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print "\n";
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}
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