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400 lines (340 loc) · 12.5 KB
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from __future__ import print_function
import os
import struct
import sys
from six.moves import xrange
import io
import gzip
import datetime
PY3 = sys.version_info[0] >= 3
MARKER_STACKTRACE = b'\x01'
MARKER_VIRTUAL_IP = b'\x02'
MARKER_TRAILER = b'\x03'
MARKER_INTERP_NAME = b'\x04' # do not use! deprecated
MARKER_HEADER = b'\x05'
MARKER_TIME_N_ZONE = b'\x06'
MARKER_META = b'\x07'
MARKER_NATIVE_SYMBOLS = b'\x08'
VERSION_BASE = 0
VERSION_THREAD_ID = 1
VERSION_TAG = 2
VERSION_MEMORY = 3
VERSION_MODE_AWARE = 4
VERSION_DURATION = 5
VERSION_TIMESTAMP = 6
PROFILE_MEMORY = 1
PROFILE_LINES = 2
PROFILE_NATIVE = 4
PROFILE_RPYTHON = 8
VMPROF_CODE_TAG = 1
VMPROF_BLACKHOLE_TAG = 2
VMPROF_JITTED_TAG = 3
VMPROF_JITTING_TAG = 4
VMPROF_GC_TAG = 5
VMPROF_ASSEMBLER_TAG = 6
VMPROF_NATIVE_TAG = 7
class AssemblerCode(int):
pass
class JittedCode(int):
pass
class NativeCode(int):
pass
def wrap_kind(kind, pc):
if kind == VMPROF_ASSEMBLER_TAG:
return AssemblerCode(pc)
elif kind == VMPROF_JITTED_TAG:
return JittedCode(pc)
elif kind == VMPROF_NATIVE_TAG:
return NativeCode(pc)
assert kind == VMPROF_CODE_TAG
return pc
def gunzip(fileobj):
is_gzipped = fileobj.read(2) == b'\037\213'
fileobj.seek(-2, os.SEEK_CUR)
if is_gzipped:
fileobj = io.BufferedReader(gzip.GzipFile(fileobj=fileobj))
return fileobj
class ReaderStatus(object):
def __init__(self, interp_name, period, version, previous_virtual_ips=None,
profile_memory=False, profile_lines=False):
if previous_virtual_ips is not None:
self.virtual_ips = previous_virtual_ips
else:
self.virtual_ips = {}
self.profiles = []
self.interp_name = interp_name
self.period = period
self.version = version
self.profile_memory = profile_memory
self.profile_lines = profile_lines
class FileReadError(Exception):
pass
def assert_error(condition, error="malformed file"):
if not condition:
raise FileReadError(error)
class LogReader(object):
# NOTE be sure to carry along changes in src/symboltable.c for
# native symbol resolution if something changes in this function
def __init__(self, fileobj, state):
self.fileobj = fileobj
self.state = state
self.word_size = None
self.addr_size = None
self.setup()
def setup(self):
pass
def detect_file_sizes(self):
self.fileobj.seek(0, os.SEEK_SET)
firstbytes = self.read(8)
three = '\x03' if not PY3 else 3
little = None
if firstbytes[4] == three:
little = True
self.setup_once(little_endian=little, word_size=4, addr_size=4)
elif firstbytes[7] == three:
little = False
self.setup_once(little_endian=little, word_size=4, addr_size=4)
else:
firstbytes = self.read(8)
if firstbytes[0] == three:
little = True
self.setup_once(little_endian=little, word_size=8, addr_size=8)
elif firstbytes[7] == three:
little = False
self.setup_once(little_endian=little, word_size=8, addr_size=8)
else:
raise NotImplementedError("could not determine word and addr size")
# determine if it is windows 64 bit
# even though it migt be a 64bit log, teh addr_size is now 4
if self.addr_size == 4:
# read further
self.fileobj.seek(0, os.SEEK_SET)
self.read(4*4)
windows64 = self.read_word() == 1
if windows64:
self.setup_once(little_endian=little, word_size=4, addr_size=8)
self.fileobj.seek(0, os.SEEK_SET)
def setup_once(self, little_endian, word_size, addr_size):
self.little_endian = little_endian
assert self.little_endian, "big endian profile are not supported"
self.word_size = word_size
self.addr_size = addr_size
def read_static_header(self):
r = self.read_word()
assert r == 0 # header count
r = self.read_word()
assert r == 3 # header size
r = self.read_word()
assert r == 0
self.state.period = self.read_word()
r = self.read_word()
assert r in (0, 1)
def read_header(self):
s = self.state
fileobj = self.fileobj
s.version, = struct.unpack("!h", fileobj.read(2))
if s.version >= VERSION_MODE_AWARE:
mode = ord(fileobj.read(1))
s.profile_memory = (mode & PROFILE_MEMORY) != 0
s.profile_lines = (mode & PROFILE_LINES) != 0
s.profile_rpython = (mode & PROFILE_RPYTHON) != 0
else:
s.profile_memory = s.version == VERSION_MEMORY
s.profile_lines = False
s.profile_rpython = False
lgt = ord(fileobj.read(1))
s.interp_name = fileobj.read(lgt)
if s.interp_name == b'pypy':
s.profile_rpython = True
if PY3:
s.interp_name = s.interp_name.decode()
def read_addr(self):
if self.addr_size == 8:
return struct.unpack('<q', self.fileobj.read(8))[0]
elif self.addr_size == 4:
return struct.unpack('<l', self.fileobj.read(4))[0]
else:
raise NotImplementedError("did not implement size %d" % self.size)
def read_word(self):
if self.word_size == 8:
return struct.unpack('<q', self.fileobj.read(8))[0]
elif self.word_size == 4:
return struct.unpack('<l', self.fileobj.read(4))[0]
else:
raise NotImplementedError("did not implement size %d" % self.size)
def read(self, count):
return self.fileobj.read(count)
def read_string(self):
cnt = self.read_word()
bytes = self.read(cnt)
if PY3:
return bytes.decode('utf-8')
return bytes
def read_trace(self, depth):
if self.state.profile_rpython:
assert depth & 1 == 0
depth = depth // 2
kinds_and_pcs = self.read_addresses(depth * 2)
# kinds_and_pcs is a list of [kind1, pc1, kind2, pc2, ...]
return [wrap_kind(kinds_and_pcs[i], kinds_and_pcs[i+1])
for i in xrange(0, len(kinds_and_pcs), 2)]
else:
trace = self.read_addresses(depth)
if self.state.profile_lines:
for i in xrange(0, len(trace), 2):
# In the line profiling mode even items in the trace are line numbers.
# Every line number corresponds to the following frame, represented by an address.
trace[i] = -trace[i]
return trace
def read_addresses(self, count):
addrs = []
for i in range(count):
addr = self.read_addr()
if addr > 0 and addr & 1 == 1:
addrs.append(NativeCode(addr))
else:
addrs.append(addr)
return addrs
def read_s64(self):
return struct.unpack('q', self.fileobj.read(8))[0]
def read_time_and_zone(self):
return datetime.datetime.fromtimestamp(
self.read_timeval()/10.0**6, self.read_timezone())
def read_timeval(self):
tv_sec = self.read_s64()
tv_usec = self.read_s64()
return tv_sec * 10**6 + tv_usec
def read_timezone(self):
timezone = self.read(8).strip(b'\x00')
# we should use pytz and parse iso8601 if we really support time zones
return None
def read_all(self):
s = self.state
fileobj = self.fileobj
self.detect_file_sizes()
self.read_static_header()
while True:
marker = fileobj.read(1)
if marker == MARKER_HEADER:
assert not s.version, "multiple headers"
self.read_header()
elif marker == MARKER_META:
key = self.read_string()
value = self.read_string()
assert not key in s.meta, "key duplication, %s already present" % (key,)
s.meta[key] = value
elif marker == MARKER_TIME_N_ZONE:
s.start_time = self.read_time_and_zone()
elif marker == MARKER_STACKTRACE:
count = self.read_word()
# for now
assert count == 1
depth = self.read_word()
assert depth <= 2**16, 'stack strace depth too high'
trace = self.read_trace(depth)
thread_id = 0
mem_in_kb = 0
if s.version >= VERSION_THREAD_ID:
thread_id = self.read_addr()
if s.profile_memory:
mem_in_kb = self.read_addr()
trace.reverse()
self.add_trace(trace, 1, thread_id, mem_in_kb)
elif marker == MARKER_VIRTUAL_IP or marker == MARKER_NATIVE_SYMBOLS:
unique_id = self.read_addr()
name = self.read_string()
self.add_virtual_ip(marker, unique_id, name)
elif marker == MARKER_TRAILER:
#if not virtual_ips_only:
# symmap = read_ranges(fileobj.read())
if s.version >= VERSION_DURATION:
s.end_time = self.read_time_and_zone()
break
else:
assert not marker, (fileobj.tell(), repr(marker))
break
self.finished_reading_profile()
def finished_reading_profile(self):
self.state.virtual_ips.sort() # I think it's sorted, but who knows
def add_virtual_ip(self, marker, unique_id, name):
self.state.virtual_ips.append((unique_id, name))
def add_trace(self, trace, trace_count, thread_id, mem_in_kb):
self.state.profiles.append((trace, trace_count, thread_id, mem_in_kb))
class LogReaderDumpNative(LogReader):
def setup(self):
self.dedup = set()
def finished_reading_profile(self):
import _vmprof
if not hasattr(_vmprof, 'resolve_addr'):
# windows does not implement that!
return
resolve_addr = _vmprof.resolve_addr
from _vmprof import resolve_addr
LogReader.finished_reading_profile(self)
if len(self.dedup) == 0:
return
self.fileobj.seek(0, os.SEEK_END)
# must match '<lang>:<name>:<line>:<file>'
# 'n' has been chosen as lang here, because the symbol
# can be generated from several languages (e.g. C, C++, ...)
for addr in self.dedup:
bytelist = [b"\x08"]
result = resolve_addr(addr)
if result is None:
name, lineno, srcfile = None, 0, None
else:
name, lineno, srcfile = result
if not name:
name = "<native symbol 0x%x>" % addr
if not srcfile:
srcfile = "-"
string = "n:%s:%d:%s" % (name, lineno, srcfile)
bytestring = string.encode('utf-8')
bytelist.append(struct.pack("P", addr))
bytelist.append(struct.pack("l", len(bytestring)))
bytelist.append(bytestring)
self.fileobj.write(b"".join(bytelist))
def add_virtual_ip(self, marker, unique_id, name):
pass # do nothing, no need to save this data
def add_trace(self, trace, trace_count, thread_id, mem_in_kb):
for addr in trace:
if addr not in self.dedup:
self.dedup.add(addr)
class ReaderState(object):
pass
class LogReaderState(ReaderState):
def __init__(self):
self.virtual_ips = []
self.profiles = []
self.interp_name = None
self.start_time = None
self.end_time = None
self.version = 0
self.profile_memory = False
self.profile_lines = False
self.meta = {}
self.little_endian = True
self.period = 0
def _read_prof(fileobj, virtual_ips_only=False):
fileobj = gunzip(fileobj)
state = LogReaderState()
reader = LogReader(fileobj, state)
reader.read_all()
if virtual_ips_only:
return state.virtual_ips
return state
class FdWrapper(object):
""" This wrapper behaves like a file object. Could not find
an stdlib API function that creates such an object without
closing it.
"""
def __init__(self, fd):
self.fd = fd
def write(self, bytes):
return os.write(self.fd, bytes)
def read(self, n):
return os.read(self.fd, n)
def seek(self, pos, how):
return os.lseek(self.fd, pos, how)
def tell(self):
return os.lseek(self.fd, 0, os.SEEK_CUR)
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