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952c018efe
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>
144 lines
4.4 KiB
Python
Executable File
144 lines
4.4 KiB
Python
Executable File
#!/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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