/usr/bin/dtrace is in systemtap-sdt-dev 2.3-1ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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# vim: et sta sts=4 sw=4 ts=8
# This handles the systemtap equivalent of
# $(DTRACE) $(DTRACEFLAGS) -G -s $^ -o $@
# $(DTRACE) $(DTRACEFLAGS) -h -s $^ -o $@
# which is a step that builds DTrace provider and probe definitions
# Copyright (C) 2009, 2010, 2011 Red Hat Inc.
#
# This file is part of systemtap, and is free software. You can
# redistribute it and/or modify it under the terms of the GNU General
# Public License (GPL); either version 2, or (at your option) any
# later version.
import os
import posix
import sys
import shlex
from subprocess import call
from tempfile import mkstemp
class _provider(object):
def __init__(self):
self.semaphores_def = "\n"
# is the type a basic scalar type?
def __basic_type(self, arg):
basic_types = [ "int","int*","long","long*","short","short int",
"unsigned long","char","char*","float","double" ]
split_arg = arg.rsplit(None,1)
return (split_arg[0].strip() in basic_types) & (arg.find("[") == -1)
def __typedef_append(self, typedefs, this_probe, arg, c, add_typedefs):
if (add_typedefs):
split_arg = arg.rsplit(None,1)
if (self.__basic_type(arg)):
return typedefs
type_name = " %s_arg%d" % (this_probe.replace("__","_"),c)
if (len(split_arg) > 1):
typedefs += ("typedef " + arg.replace(" " + split_arg[1].split("[")[0].lstrip("*"),type_name).strip() + "; ")
typedefs += (type_name + type_name + "_v;\n")
else:
typedefs += ("typedef " + arg.strip() + type_name + "; ")
typedefs += (type_name + type_name + "_v;\n")
return typedefs
def __semaphore_def_append(self, this_probe):
# NB: unsigned short is fixed in ABI
self.semaphores_def += '#if defined STAP_SDT_V1\n'
self.semaphores_def += '#define %s_%s_semaphore %s_semaphore\n' % \
(self.provider,this_probe,this_probe)
self.semaphores_def += '#endif\n'
self.semaphores_def += '#if defined STAP_SDT_V1 || defined STAP_SDT_V2 \n'
self.semaphores_def += "__extension__ unsigned short %s_%s_semaphore __attribute__ ((unused)) __attribute__ ((section (\".probes\")));\n" % \
(self.provider,this_probe)
self.semaphores_def += '#else\n'
self.semaphores_def += "__extension__ unsigned short %s_%s_semaphore __attribute__ ((unused)) __attribute__ ((section (\".probes\"))) __attribute__ ((visibility (\"hidden\")));\n" % \
(self.provider,this_probe)
self.semaphores_def += '#endif\n'
def semaphore_def_write(self, file):
file.write(self.semaphores_def)
def generate(self, provider, header, add_typedefs):
have_provider = False
self.f = open(provider)
self.h = open(header,mode='w')
self.h.write("/* Generated by the Systemtap dtrace wrapper */\n")
self.h.write("\n#define _SDT_HAS_SEMAPHORES 1\n\n")
self.h.write("\n#define STAP_HAS_SEMAPHORES 1 /* deprecated */\n\n")
self.h.write("\n#include <sys/sdt.h>\n\n")
in_comment = False
typedefs = ""
while (True):
line = self.f.readline()
if (line == ""):
break
if (line.find("/*") != -1):
in_comment = True
if (line.find("*/") != -1):
in_comment = False
continue
if (in_comment):
continue
if (line.find("provider") != -1):
tokens = line.split()
have_provider = True
self.provider = tokens[1]
elif (not have_provider):
if (add_typedefs):
self.h.write (line)
elif (have_provider and line.find("probe ") != -1):
while (line.find(")") < 0):
line += self.f.readline()
this_probe = line[line.find("probe ")+5:line.find("(")].strip()
this_probe_canon = self.provider.upper() + "_" + this_probe.replace("__","_").upper()
args = (line[line.find("(")+1:line.find(")")])
args_string = ""
arg = ""
i = 0
c = 0
self.__semaphore_def_append (this_probe)
while (i < len(args)):
if (args[i:i+1] == ","):
args_string = ('%s %s,' %
(args_string, arg.strip()))
c += 1
typedefs = self.__typedef_append (typedefs, this_probe,
arg, c, add_typedefs)
arg = ""
else:
arg = arg + args[i]
i += 1
if (i != 0):
args_string = ('%s %s' % (args_string, arg.strip()))
if (not args_string):
c = 0
stap_str = "DTRACE_PROBE(%s,%s" % \
(self.provider,this_probe)
else:
c += 1
typedefs = self.__typedef_append (typedefs, this_probe,
arg, c, add_typedefs)
stap_str = "DTRACE_PROBE%d(%s,%s" % \
(c,self.provider,this_probe)
define_str = "#define %s(" % (this_probe_canon)
i = 1
while (i <= c):
if (i != 1):
define_str += ","
define_str = define_str + "arg%s" % (i);
stap_str = stap_str + ",arg%s" % (i);
i += 1
self.h.write('/* %s (%s) */\n' % \
(this_probe_canon,args_string))
self.h.write('#if defined STAP_SDT_V1\n')
self.h.write('#define %s_ENABLED() __builtin_expect (%s_semaphore, 0)\n' % \
(this_probe_canon,this_probe))
self.h.write('#define %s_%s_semaphore %s_semaphore\n' % \
(self.provider,this_probe,this_probe))
self.h.write('#else\n')
self.h.write('#define %s_ENABLED() __builtin_expect (%s_%s_semaphore, 0)\n' % \
(this_probe_canon,self.provider,this_probe))
self.h.write('#endif\n')
# NB: unsigned short is fixed in ABI
self.h.write("__extension__ extern unsigned short %s_%s_semaphore __attribute__ ((unused)) __attribute__ ((section (\".probes\")));\n" % \
(self.provider,this_probe))
self.h.write(define_str + ") \\\n")
self.h.write(stap_str + ")\n\n")
elif (line.find("}") != -1 and have_provider):
have_provider = False
if (add_typedefs):
self.h.write(typedefs)
self.h.close()
def usage ():
print "Usage " + sys.argv[0] + " [--help] [-h | -G] [-C [-I<Path>]] -s File.d [-o <File>]"
def help ():
usage()
print "Where -h builds a systemtap header file from the .d file"
print " -C when used with -h, also run cpp preprocessor"
print " -o specifies an explicit output file name,"
print " the default for -G is file.o and -h is file.h"
print " -I when running cpp pass through this -I include Path"
print " -s specifies the name of the .d input file"
print " -G builds a stub file.o from file.d,"
print " which is required by some packages that use dtrace."
sys.exit(1)
########################################################################
# main
########################################################################
def main():
if (len(sys.argv) < 2):
usage()
return 1
i = 1
build_header = False
build_source = False
add_typedefs = False
keep_temps = False
use_cpp = False
suffix = ""
filename = ""
s_filename = ""
includes = []
defines = []
while (i < len(sys.argv)):
if (sys.argv[i] == "-o"):
i += 1
filename = sys.argv[i]
elif (sys.argv[i] == "-s"):
i += 1
s_filename = sys.argv[i]
elif (sys.argv[i] == "-C"):
use_cpp = True
elif (sys.argv[i].startswith("-D")):
defines.append(sys.argv[i])
elif (sys.argv[i] == "-h"):
build_header = True
suffix = ".h"
elif (sys.argv[i].startswith("-I")):
includes.append(sys.argv[i])
elif (sys.argv[i] == "-G"):
build_source = True
suffix = ".o"
elif (sys.argv[i] == "-k"):
keep_temps = True
elif (sys.argv[i] == "--types"):
add_typedefs = True
elif (sys.argv[i] == "--help"):
help()
i += 1
if (build_header == False and build_source == False):
usage()
return 1
if (s_filename != "" and use_cpp):
(d,fn) = mkstemp(suffix=".d")
CPP = os.environ.get("CPP", "cpp")
retcode = call(shlex.split(CPP) + includes + defines + [s_filename, fn])
if (retcode != 0):
print "\"cpp includes s_filename\" failed"
usage()
return 1
s_filename = fn
if (filename == ""):
if (s_filename != ""):
(filename,ext) = os.path.splitext(s_filename)
filename = os.path.basename(filename)
else:
usage()
return 1
else:
suffix = ""
if (build_header):
providers = _provider()
providers.generate(s_filename, filename + suffix, add_typedefs)
elif (build_source):
(basename,ext) = os.path.splitext(s_filename)
# create for semaphore_def_write
providers = _provider()
(d,fn) = mkstemp(suffix=".h")
providers.generate(s_filename, fn, add_typedefs)
if (not keep_temps):
os.remove(fn)
else:
print "header: " + fn
(d,fn) = mkstemp(suffix=".c")
f = open(fn,mode='w')
# dummy declaration just to make the object file non-empty
f.write("static void __dtrace (void) __attribute__((unused));\n")
f.write("static void __dtrace (void) {}\n")
f.write("\n#include <sys/sdt.h>\n\n")
providers.semaphore_def_write(f)
f.close()
CC = os.environ.get("CC", "gcc")
CFLAGS = "-g " + os.environ.get("CFLAGS", "")
retcode = call(shlex.split(CC) + defines + includes + shlex.split(CFLAGS) +
["-fPIC", "-I.", "-I/usr/include", "-c", fn, "-o",
filename + suffix], shell=False)
if (retcode != 0):
print "\"gcc " + fn + "\" failed"
usage()
return 1
if (not keep_temps):
os.remove(fn)
else:
print "source: " + fn
if (use_cpp):
if (not keep_temps):
os.remove(s_filename)
else:
print "cpp: " + s_filename
return 0
if __name__ == "__main__":
sys.exit(main())
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