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#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0-only
#
# Copyright (C) 2019-2022 Red Hat, Inc. Daniel Bristot de Oliveira <bristot@kernel.org>
#
# dot2k: transform dot files into a monitor for the Linux kernel.
#
# For further information, see:
# Documentation/trace/rv/da_monitor_synthesis.rst
from dot2.dot2c import Dot2c
import platform
import os
class dot2k(Dot2c):
monitor_types = { "global" : 1, "per_cpu" : 2, "per_task" : 3 }
monitor_templates_dir = "dot2k/rv_templates/"
monitor_type = "per_cpu"
def __init__(self, file_path, MonitorType):
super().__init__(file_path)
self.monitor_type = self.monitor_types.get(MonitorType)
if self.monitor_type == None:
raise Exception("Unknown monitor type: %s" % MonitorType)
self.monitor_type = MonitorType
self.__fill_rv_templates_dir()
self.main_c = self.__open_file(self.monitor_templates_dir + "main_" + MonitorType + ".c")
self.enum_suffix = "_%s" % self.name
def __fill_rv_templates_dir(self):
if os.path.exists(self.monitor_templates_dir) == True:
return
if platform.system() != "Linux":
raise Exception("I can only run on Linux.")
kernel_path = "/lib/modules/%s/build/tools/verification/dot2/dot2k_templates/" % (platform.release())
if os.path.exists(kernel_path) == True:
self.monitor_templates_dir = kernel_path
return
if os.path.exists("/usr/share/dot2/dot2k_templates/") == True:
self.monitor_templates_dir = "/usr/share/dot2/dot2k_templates/"
return
raise Exception("Could not find the template directory, do you have the kernel source installed?")
def __open_file(self, path):
try:
fd = open(path)
except OSError:
raise Exception("Cannot open the file: %s" % path)
content = fd.read()
return content
def __buff_to_string(self, buff):
string = ""
for line in buff:
string = string + line + "\n"
# cut off the last \n
return string[:-1]
def fill_tracepoint_handlers_skel(self):
buff = []
for event in self.events:
buff.append("static void handle_%s(void *data, /* XXX: fill header */)" % event)
buff.append("{")
if self.monitor_type == "per_task":
buff.append("\tstruct task_struct *p = /* XXX: how do I get p? */;");
buff.append("\tda_handle_event_%s(p, %s%s);" % (self.name, event, self.enum_suffix));
else:
buff.append("\tda_handle_event_%s(%s%s);" % (self.name, event, self.enum_suffix));
buff.append("}")
buff.append("")
return self.__buff_to_string(buff)
def fill_tracepoint_attach_probe(self):
buff = []
for event in self.events:
buff.append("\trv_attach_trace_probe(\"%s\", /* XXX: tracepoint */, handle_%s);" % (self.name, event))
return self.__buff_to_string(buff)
def fill_tracepoint_detach_helper(self):
buff = []
for event in self.events:
buff.append("\trv_detach_trace_probe(\"%s\", /* XXX: tracepoint */, handle_%s);" % (self.name, event))
return self.__buff_to_string(buff)
def fill_main_c(self):
main_c = self.main_c
min_type = self.get_minimun_type()
nr_events = self.events.__len__()
tracepoint_handlers = self.fill_tracepoint_handlers_skel()
tracepoint_attach = self.fill_tracepoint_attach_probe()
tracepoint_detach = self.fill_tracepoint_detach_helper()
main_c = main_c.replace("MIN_TYPE", min_type)
main_c = main_c.replace("MODEL_NAME", self.name)
main_c = main_c.replace("NR_EVENTS", str(nr_events))
main_c = main_c.replace("TRACEPOINT_HANDLERS_SKEL", tracepoint_handlers)
main_c = main_c.replace("TRACEPOINT_ATTACH", tracepoint_attach)
main_c = main_c.replace("TRACEPOINT_DETACH", tracepoint_detach)
return main_c
def fill_model_h_header(self):
buff = []
buff.append("/*")
buff.append(" * Automatically generated C representation of %s automaton" % (self.name))
buff.append(" * For further information about this format, see kernel documentation:")
buff.append(" * Documentation/trace/rv/deterministic_automata.rst")
buff.append(" */")
buff.append("")
return buff
def fill_model_h(self):
#
# Adjust the definition names
#
self.enum_states_def = "states_%s" % self.name
self.enum_events_def = "events_%s" % self.name
self.struct_automaton_def = "automaton_%s" % self.name
self.var_automaton_def = "automaton_%s" % self.name
buff = self.fill_model_h_header()
buff += self.format_model()
return self.__buff_to_string(buff)
def __create_directory(self):
try:
os.mkdir(self.name)
except FileExistsError:
return
except:
print("Fail creating the output dir: %s" % self.name)
def __create_file(self, file_name, content):
path = "%s/%s" % (self.name, file_name)
try:
file = open(path, 'w')
except FileExistsError:
return
except:
print("Fail creating file: %s" % path)
file.write(content)
file.close()
def __get_main_name(self):
path = "%s/%s" % (self.name, "main.c")
if os.path.exists(path) == False:
return "main.c"
return "__main.c"
def print_files(self):
main_c = self.fill_main_c()
model_h = self.fill_model_h()
self.__create_directory()
path = "%s.c" % self.name
self.__create_file(path, main_c)
path = "%s.h" % self.name
self.__create_file(path, model_h)
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