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# Copyright 2020 the V8 project authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import re
import socket
import struct
import subprocess
import time
import xml.etree.ElementTree
import sys
# Python2 has both int and long, Python3 only has int, which is the same as
# Python2 long.
try:
long
except NameError:
long = int
# Python2 has xrange and range. Python3 range is Python2 xrange.
try:
xrange
except NameError:
xrange = range
SOCKET_ADDR = ('localhost', 8765)
SIGTRAP = 5
SIGSEGV = 11
RETURNCODE_KILL = -9
ARCH = 'wasm32'
REG_DEFS = {
ARCH: [('pc', 'Q'), ],
}
def EnsurePortIsAvailable(addr=SOCKET_ADDR):
# As a validity check, check that the TCP port is available by binding to it
# ourselves (and then unbinding). Otherwise, we could end up talking to an
# old instance of the GDB stub that is still hanging around, or to some
# unrelated service that uses the same port number. Of course, there is still
# a race condition because an unrelated process could bind the port after we
# unbind.
sock = socket.socket()
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, True)
sock.bind(addr)
sock.close()
def RspChecksum(data):
checksum = 0
for char in data:
checksum = (checksum + ord(char)) & 0xff
return checksum
class GdbRspConnection(object):
def __init__(self, addr=SOCKET_ADDR):
self._socket = self._Connect(addr)
def _Connect(self, addr):
# We have to poll because we do not know when the GDB stub has successfully
# done bind() on the TCP port. This is inherently unreliable.
timeout_in_seconds = 10
poll_time_in_seconds = 0.1
for i in xrange(int(timeout_in_seconds / poll_time_in_seconds)):
# On Mac OS X, we have to create a new socket FD for each retry.
sock = socket.socket()
# Do not delay sending small packets. This significantly speeds up debug
# stub tests.
sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, True)
try:
sock.connect(addr)
except socket.error:
# Retry after a delay.
time.sleep(poll_time_in_seconds)
else:
return sock
raise Exception('Could not connect to the debug stub in %i seconds'
% timeout_in_seconds)
def _GetReply(self):
reply = ''
message_finished = re.compile('#[0-9a-fA-F]{2}')
while True:
data = self._socket.recv(1024)
if len(data) == 0:
raise AssertionError('EOF on socket reached with '
'incomplete reply message: %r' % reply)
reply += data
if message_finished.match(reply[-3:]):
break
match = re.match('\+?\$([^#]*)#([0-9a-fA-F]{2})$', reply)
if match is None:
raise AssertionError('Unexpected reply message: %r' % reply)
reply_body = match.group(1)
checksum = match.group(2)
expected_checksum = '%02x' % RspChecksum(reply_body)
if checksum != expected_checksum:
raise AssertionError('Bad RSP checksum: %r != %r' %
(checksum, expected_checksum))
# Send acknowledgement.
self._socket.send('+')
return reply_body
# Send an rsp message, but don't wait for or expect a reply.
def RspSendOnly(self, data):
msg = '$%s#%02x' % (data, RspChecksum(data))
return self._socket.send(msg)
def RspRequest(self, data):
self.RspSendOnly(data)
reply = self._GetReply()
return reply
def Close(self):
self._socket.close()
def PopenDebugStub(command):
EnsurePortIsAvailable()
return subprocess.Popen(command)
def KillProcess(process):
if process.returncode is not None:
# kill() won't work if we've already wait()'ed on the process.
return
try:
process.kill()
except OSError:
if sys.platform == 'win32':
# If process is already terminated, kill() throws
# "WindowsError: [Error 5] Access is denied" on Windows.
pass
else:
raise
process.wait()
class LaunchDebugStub(object):
def __init__(self, command):
self._proc = PopenDebugStub(command)
def __enter__(self):
try:
return GdbRspConnection()
except:
KillProcess(self._proc)
raise
def __exit__(self, exc_type, exc_value, traceback):
KillProcess(self._proc)
def AssertEquals(x, y):
if x != y:
raise AssertionError('%r != %r' % (x, y))
def DecodeHex(data):
assert len(data) % 2 == 0, data
return bytes(bytearray([int(data[index * 2 : (index + 1) * 2], 16) for index in xrange(len(data) // 2)]))
def EncodeHex(data):
return ''.join('%02x' % ord(byte) for byte in data)
def DecodeUInt64Array(data):
assert len(data) % 16 == 0, data
result = []
for index in xrange(len(data) // 16):
value = 0
for digit in xrange(7, -1, -1):
value = value * 256 + int(data[index * 16 + digit * 2 : index * 16 + (digit + 1) * 2], 16)
result.append(value)
return result
def AssertReplySignal(reply, signal):
AssertEquals(ParseThreadStopReply(reply)['signal'], signal)
def ParseThreadStopReply(reply):
match = re.match('T([0-9a-f]{2})thread-pcs:([0-9a-f]+);thread:([0-9a-f]+);(library:([0-9a-f]*);)?$', reply)
if not match:
raise AssertionError('Bad thread stop reply: %r' % reply)
return {'signal': int(match.group(1), 16),
'thread_pc': int(match.group(2), 16),
'thread_id': int(match.group(3), 16)}
def CheckInstructionPtr(connection, expected_ip):
ip_value = DecodeRegs(connection.RspRequest('g'))['pc']
AssertEquals(ip_value, expected_ip)
def DecodeRegs(reply):
defs = REG_DEFS[ARCH]
names = [reg_name for reg_name, reg_fmt in defs]
fmt = ''.join([reg_fmt for reg_name, reg_fmt in defs])
values = struct.unpack_from(fmt, DecodeHex(reply))
return dict(zip(names, values))
def GetLoadedModules(connection):
modules = {}
reply = connection.RspRequest('qXfer:libraries:read')
AssertEquals(reply[0], 'l')
library_list = xml.etree.ElementTree.fromstring(reply[1:])
AssertEquals(library_list.tag, 'library-list')
for library in library_list:
AssertEquals(library.tag, 'library')
section = library.find('section')
address = section.get('address')
assert long(address) > 0
modules[long(address)] = library.get('name')
return modules
def GetLoadedModuleAddress(connection):
modules = GetLoadedModules(connection)
assert len(modules) > 0
return modules.keys()[0]
def ReadCodeMemory(connection, address, size):
reply = connection.RspRequest('m%x,%x' % (address, size))
assert not reply.startswith('E'), reply
return DecodeHex(reply)
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