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import gdb
from collections import defaultdict
import time
import os
import os.path
import signal
from threading import Thread
import json
import re
def dmdprof_get_loc(val):
if (val.type.code == gdb.TYPE_CODE_PTR
and val.type.target().name is not None
and val.type.target().name != "void"
):
return dmdprof_get_loc(val.referenced_value())
if val.type.name is None:
return None
# Modules
try:
fn = val["srcfile"]["name"]["str"].string("utf-8")
return (fn, 0, 0)
except:
pass
# Symbols, statements, declarations, and expressions
try:
loc = val["loc"]
return (loc["filename"].string("utf-8"), int(loc["linnum"]), int(loc["charnum"]))
except:
pass
# Backend elems
try:
srcpos = val["Esrcpos"]
return (srcpos["Sfilename"].string("utf-8"), int(srcpos["Slinnum"]), int(srcpos["Scharnum"]))
except:
pass
return None
def dmdprof_get_stack():
oldloc = ()
stack = []
frame = gdb.newest_frame()
last_frame = frame
while frame:
block = frame.block()
while block:
if not block.is_global:
for symbol in block:
if symbol.is_argument:
loc = dmdprof_get_loc(symbol.value(frame))
if loc is not None and loc != oldloc:
stack.append(loc)
oldloc = loc
last_frame = frame
break # Consider just the first argument with a Loc
block = block.superblock
frame = frame.older()
frame = last_frame
while frame:
name = frame.name()
name = re.sub(r"\(.*", "", name)
if name == "Module::accept" or name == "dmd.mars.tryMain":
pass
elif name == "D main":
stack.append((name, -2, -2))
else:
stack.append((name, -1, -1))
frame = frame.older()
return tuple(stack)
def dmdprof_print_stack():
stack = dmdprof_get_stack()
for loc in stack:
(filename, line, char) = loc
locstr = "{}({},{})".format(filename, line, char)
if line > 0 and os.path.exists(filename):
linestr = open(filename).readlines()[line-1]
locstr += ": " + linestr.rstrip('\n')
print(locstr)
class Executor:
def __init__(self, cmd):
self.__cmd = cmd
def __call__(self):
gdb.execute(self.__cmd)
class DMDProfiler:
def __init__(self,
period = 0.01,
output_filename = "profile.json",
quit_on_exit = False):
self.period = period
self.output_filename = output_filename
self.quit_on_exit = quit_on_exit
def stop_func(self):
try:
os.kill(self.pid, signal.SIGINT)
except ProcessLookupError:
pass
def threaded_function(self):
time.sleep(self.period)
# gdb.post_event(Executor("interrupt"))
gdb.post_event(self.stop_func)
def stop_handler(self, event):
try:
self.callchains.append(dmdprof_get_stack())
except RuntimeError:
pass
gdb.post_event(Executor("continue"))
def cont_handler(self, event):
(Thread(target = self.threaded_function)).start()
def exit_handler(self, event):
gdb.events.cont.disconnect(self.cont_handler)
gdb.events.stop.disconnect(self.stop_handler)
gdb.events.exited.disconnect(self.exit_handler)
print("\nProfiling complete with %d samples." % len(self.callchains))
self.save_results()
if self.quit_on_exit:
gdb.execute("quit")
def save_results(self):
"""Save results as gprof2dot JSON format."""
res = {"version":0, "functions":[], "events":[]}
functions = {}
for callchain in self.callchains:
if len(callchain) == 0:
continue
funcs = []
for line in callchain:
if line in functions:
fun_id = functions[line]
else:
fun_id = len(functions)
functions[line] = fun_id
res["functions"].append({
# We don't know the actual function name, so
# abuse the module field for some hierarchy
"module" : line[0],
# "module" : self.abbreviate_file_name(line[0]),
"name" : str(line[1]) + ":" + str(line[2])
})
funcs.append(fun_id)
res["events"].append({
"callchain" : funcs,
"cost" : [self.period]
})
json.dump(res, open(self.output_filename, 'w'))
print(self.output_filename + " written.")
# def abbreviate_file_name(self, fn):
# fn = re.sub(r".*/phobos/", "", fn)
# fn = re.sub(r".*/druntime/import/", "", fn)
# return fn
def profile(self):
gdb.execute("set pagination off")
gdb.execute("start")
self.pid = gdb.selected_inferior().pid
self.callchains = []
gdb.events.cont.connect(self.cont_handler)
gdb.events.stop.connect(self.stop_handler)
gdb.events.exited.connect(self.exit_handler)
gdb.post_event(Executor("continue"))