def init_default_thread(self):
'''Create initial thread group and thread.
Both are java's objects
'''
tg_klass = self.get_class("java/lang/ThreadGroup")
t_klass = self.get_class("java/lang/Thread")
tg = tg_klass.get_instance(self)
t = t_klass.get_instance(self)
tg.fields["name"] = self.make_heap_string("system")
tg.fields["maxPriority"] = 10
t.fields["priority"] = 5
t.fields["name"] = self.make_heap_string("system-main")
t.fields["blockerLock"] = self.add_to_heap(
self.get_class("java/lang/Object").get_instance(self))
tg_ref = self.add_to_heap(tg)
t_ref = self.add_to_heap(t)
t.fields["group"] = tg_ref
# Add thread to threadgroup; call byte code of void add(Thread)
pvm_thread = Thread(self, t_ref)
pvm_thread.is_alive = True
method = tg_klass.find_method("add", "(Ljava/lang/Thread;)V")
args = [None]*method[1]
args[0] = tg_ref
args[1] = t_ref
frame = Frame(pvm_thread, tg_klass, method, args, "system tg init")
pvm_thread.frame_stack.append(frame)
self.run_thread(pvm_thread)
self.top_group = tg
self.top_thread = t
self.top_group_ref = tg_ref
self.top_thread_ref = t_ref
def java_lang_System_identityHashCode__Ljava_lang_Object__I(frame, args):
ref = args[0]
if ref is None:
frame.stack.append(0)
return
assert type(ref) is tuple
assert ref[0] == "ref"
o = frame.vm.heap[ref[1]]
klass = o.java_class
method = klass.find_method("hashCode", "()I")
if method[0] & 0x0100 > 0:
# assuming native call to object's hashCode, get heap id
frame.stack.append(ref[1])
return
pvm_thread = Thread(frame.vm, frame.vm.top_thread_ref)
pvm_thread.is_alive = True
m_args = [None] * method[1]
m_args[0] = ref
sub = Frame(pvm_thread, klass, method, m_args, "call get hashCode")
pvm_thread.frame_stack.append(sub)
frame.vm.run_thread(pvm_thread)
assert sub.has_result
frame.stack.append(sub.ret)
def java_lang_System_identityHashCode__Ljava_lang_Object__I(frame, args):
ref = args[0]
if ref is None:
frame.stack.append(0)
return
assert type(ref) is tuple
assert ref[0] == "ref"
o = frame.vm.heap[ref[1]]
klass = o.java_class
method = klass.find_method("hashCode", "()I")
if method[0] & 0x0100 > 0:
# assuming native call to object's hashCode, get heap id
frame.stack.append(ref[1])
return
pvm_thread = Thread(frame.vm, frame.vm.top_thread_ref)
pvm_thread.is_alive = True
m_args = [None]*method[1]
m_args[0] = ref
sub = Frame(pvm_thread, klass, method, m_args,
"call get hashCode")
pvm_thread.frame_stack.append(sub)
frame.vm.run_thread(pvm_thread)
assert sub.has_result
frame.stack.append(sub.ret)
def initialize_vm(self, main_klass, method, m_args):
"""
Run initialized vm with specific method of a class.
This is class entered from command line. Method is looked up
void main(String args[]).
For more details see methods.txt in docs.
:param main_klass:
:param method:
:param m_args:
:return:
"""
t_klass = self.get_class("java/lang/Thread")
t = t_klass.get_instance(self)
t.fields["priority"] = 5
t.fields["name"] = self.make_heap_string("main")
t.fields["blockerLock"] = self.add_to_heap(
self.get_class("java/lang/Object").get_instance(self))
t_ref = self.add_to_heap(t)
t.fields["group"] = self.top_group_ref
pvm_thread = Thread(self, t_ref)
pvm_thread.is_alive = True
frame = Frame(pvm_thread, main_klass, method, m_args, "main")
pvm_thread.frame_stack.append(frame)
self.add_thread(pvm_thread)
logger.debug("run thread pool")
def init_default_thread(self):
'''Create initial thread group and thread.
Both are java's objects
'''
tg_klass = self.get_class("java/lang/ThreadGroup")
t_klass = self.get_class("java/lang/Thread")
tg = tg_klass.get_instance(self)
t = t_klass.get_instance(self)
tg.fields["name"] = self.make_heap_string("system")
tg.fields["maxPriority"] = 10
t.fields["priority"] = 5
t.fields["name"] = self.make_heap_string("system-main")
t.fields["blockerLock"] = self.add_to_heap(
self.get_class("java/lang/Object").get_instance(self))
tg_ref = self.add_to_heap(tg)
t_ref = self.add_to_heap(t)
t.fields["group"] = tg_ref
# Add thread to threadgroup; call byte code of void add(Thread)
pvm_thread = Thread(self, t_ref)
pvm_thread.is_alive = True
method = tg_klass.find_method("add", "(Ljava/lang/Thread;)V")
args = [None] * method[1]
args[0] = tg_ref
args[1] = t_ref
frame = Frame(pvm_thread, tg_klass, method, args, "system tg init")
pvm_thread.frame_stack.append(frame)
self.run_thread(pvm_thread)
self.top_group = tg
self.top_thread = t
self.top_group_ref = tg_ref
self.top_thread_ref = t_ref
def java_lang_Thread_start0___V(frame, args):
'''Create new thread with one's void run()
see thread.txt for details
'''
t_ref = args[0]
o = frame.vm.heap[t_ref[1]]
run = o.java_class.find_method("run", "()V")
assert run is not None
pvm_thread = Thread(frame.vm, t_ref)
pvm_thread.is_alive = True
m_args = [None] * run[1]
m_args[0] = t_ref
sub = Frame(pvm_thread, o.java_class, run, m_args, "Thread")
pvm_thread.frame_stack.append(sub)
frame.vm.add_thread(pvm_thread)
def __init__(self, _class_path="."):
logger.debug("Creating VM")
# Major memory structures
self.perm_gen = {}
self.heap = {}
self.heap_next_id = 1
# todo clean up self.cache_klass_klass = {}
self.global_strings = {}
# Handle for linked list of threads
self.threads_queue = deque()
self.threads = []
self.non_daemons = 0
self.top_group = None
self.top_thread = None
self.top_group_ref = None
self.top_thread_ref = None
self.class_path = read_class_path(_class_path)
self.init_default_thread()
# Load System and init major fields
system_class = self.get_class("java/lang/System")
# Set System.props to vm owned object
system_class.static_fields["props"][1] = (
"vm_ref", VM_OBJECTS["System.Properties"])
# STDout initialization using vm owned object
ps_class = self.get_class("java/io/PrintStream")
ps_object = ps_class.get_instance(self)
ps_ref = self.add_to_heap(ps_object)
method = ps_class.find_method("<init>", "(Ljava/io/OutputStream;)V")
std_out_ref = ("vm_ref", VM_OBJECTS["Stdout.OutputStream"])
thread = Thread(self, None)
frame = Frame(thread, ps_class, method, [ps_ref, std_out_ref],
"PrintStream init")
thread.frame_stack.append(frame)
logger.debug("Run PrintStream init")
self.run_thread(thread) # Run exclusive thread
# <--thread added to the VM at this point
system_class.static_fields["out"][1] = ps_ref
system_class.static_fields["in"][1] = \
("vm_ref", VM_OBJECTS["Stdin.InputputStream"])
# Additional parameters
system_class.static_fields["lineSeparator"][1] = \
self.make_heap_string("\n")
# Load additional classes to speed up booting
self.touch_classes()
self.initialized = True
logger.debug("VM created")
def run_static_constructor(self, java_class):
'''Static constructor is run for every class loaded by class loader.
It is executed in thread exclusive mode.
'''
logger.debug("Running static constructor for %s", java_class.this_name)
method = java_class.static_contructor()
if method is None:
logger.debug("No static constructor for %s", java_class.this_name)
return
pvm_thread = Thread(self, self.top_thread_ref)
pvm_thread.is_alive = True
frame = Frame(pvm_thread, java_class, method, [None] * method[1],
"<clinit:{0}>".format(java_class.this_name))
pvm_thread.frame_stack.append(frame)
self.run_thread(pvm_thread)
logger.debug("Finished with static constructor for %s",
java_class.this_name)
def run_static_constructor(self, java_class):
'''Static constructor is run for every class loaded by class loader.
It is executed in thread exclusive mode.
'''
logger.debug("Running static constructor for %s",
java_class.this_name)
method = java_class.static_contructor()
if method is None:
logger.debug("No static constructor for %s",
java_class.this_name)
return
pvm_thread = Thread(self, self.top_thread_ref)
pvm_thread.is_alive = True
frame = Frame(pvm_thread, java_class, method, [None]*method[1],
"<clinit:{0}>".format(java_class.this_name))
pvm_thread.frame_stack.append(frame)
self.run_thread(pvm_thread)
logger.debug("Finished with static constructor for %s",
java_class.this_name)
def raise_exception(self, frame, name):
'''Util method to raise an exception based on name.
e.g. java.lang.NullPointerException
Exception is created on heap and throw op is called
'''
ex_klass = self.get_class(name)
ex = ex_klass.get_instance(self)
ref = self.add_to_heap(ex)
method = ex_klass.find_method("<init>", "()V")
m_args = [None]*method[1]
m_args[0] = ref
pvm_thread = Thread(self, None)
pvm_thread.is_alive = True
sub = Frame(pvm_thread, ex_klass, method, m_args, "exinit")
pvm_thread.frame_stack.append(sub)
self.run_thread(pvm_thread)
frame.stack.append(ref)
op_0xbf(frame)
def raise_exception(self, frame, name):
'''Util method to raise an exception based on name.
e.g. java.lang.NullPointerException
Exception is created on heap and throw op is called
'''
ex_klass = self.get_class(name)
ex = ex_klass.get_instance(self)
ref = self.add_to_heap(ex)
method = ex_klass.find_method("<init>", "()V")
m_args = [None] * method[1]
m_args[0] = ref
pvm_thread = Thread(self, None)
pvm_thread.is_alive = True
sub = Frame(pvm_thread, ex_klass, method, m_args, "exinit")
pvm_thread.frame_stack.append(sub)
self.run_thread(pvm_thread)
frame.stack.append(ref)
get_operation('0xbf')(frame)
def run_vm(self, main_klass, method, m_args):
'''Run initialized vm with specific method of a class.
This is class entered from command line. Method is looked up
void main(String args[]).
For more details see methods.txt in docs.
'''
t_klass = self.get_class("java/lang/Thread")
t = t_klass.get_instance(self)
t.fields["priority"] = 5
t.fields["name"] = self.make_heap_string("main")
t.fields["blockerLock"] = self.add_to_heap(
self.get_class("java/lang/Object").get_instance(self))
t_ref = self.add_to_heap(t)
t.fields["group"] = self.top_group_ref
pvm_thread = Thread(self, t_ref)
pvm_thread.is_alive = True
frame = Frame(pvm_thread, main_klass, method, m_args, "main")
pvm_thread.frame_stack.append(frame)
self.add_thread(pvm_thread)
logger.debug("run thread pool")
self.run_thread_pool()
def sun_reflect_NativeConstructorAccessorImpl_newInstance0__Ljava_lang_reflect_Constructor__Ljava_lang_Object__Ljava_lang_Object_(frame, args):
'''Create instance of a class, with constructor call'''
ref = args[0]
params = args[1]
assert type(ref) is tuple and ref[0] == "ref"
assert params is None or len(params) == 0
o = frame.vm.heap[ref[1]]
klass_klass = frame.vm.heap[o.fields["clazz"][1]]
clazz = frame.vm.get_class(klass_klass.fields["@CLASS_NAME"])
signature = str_to_string(frame.vm, o.fields["signature"])
assert signature == "()V"
instance = clazz.get_instance(frame.vm)
iref = frame.vm.add_to_heap(instance)
frame.stack.append(iref)
method = clazz.find_method("<init>", signature)
# actully running constructor in exclusive mode
pvm_thread = Thread(frame.vm, frame.vm.top_thread_ref)
pvm_thread.is_alive = True
m_args = [None]*method[1]
m_args[0] = iref
sub = Frame(pvm_thread, clazz, method, m_args, "nativ instance0")
pvm_thread.frame_stack.append(sub)
frame.vm.run_thread(pvm_thread)