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What steps will reproduce the problem?
1. Run the following code (also attached)
import sys
import PyV8
class ProxyObj(object):
def __init__(self):
pass
def what(self):
pass
class Global(object):
def Obj(self):
return ProxyObj()
def case1():
ctxt = PyV8.JSContext(Global())
with ctxt:
obj = ctxt.eval("""function foo() {
var theObj = Obj();
return theObj;
}
var res = foo();
res;
""")
print "Case 1:", sys.getrefcount(obj)
def case2():
ctxt = PyV8.JSContext(Global())
with ctxt:
obj = ctxt.eval("""function foo() {
var theObj = Obj();
theObj.what();
theObj.what();
theObj.what();
return theObj;
}
var res = foo();
res;
""")
print "Case 2:", sys.getrefcount(obj)
case1()
case2()
What is the expected output? What do you see instead?
I would expect:
Case 1: 3
Case 2: 3
Because there should be 3 references to the object: The local python var 'obj',
the reference from V8, and the reference that 'getrefcount' has while it's
running.
I instead see:
Case 1: 3
Case 2: 6
What version of the product are you using? On what operating system?
Using Python 2.6.6 with PyV8-1.0-preview-r443.win32-py2.6.exe on Windows 7
Please provide any additional information below.
Inserting a "PyV8.JSEngine.collect()" call doesn't fix the issue.
Original issue reported on code.google.com by csaft...@gmail.com on 17 Jul 2013 at 4:40
Note that the same happens if Global and ProxyObj inherit from PyV8.JSClass vs.
from object.
The same also happens without having the function `foo` involved. That is:
var theObj = Obj();
theObj.what();
theObj.what();
theObj.what();
theObj;
Original comment by csaft...@gmail.com on 17 Jul 2013 at 4:42
* If ProxyObj inherits from JSObject, same behavior.
* The function doesn't have to be called. If this is Case 2 , you get the same
output:
var theObj = Obj();
theObj.what;
theObj.what;
theObj.what;
theObj;
* If 'what' is a variable or a function/not an instance method, bug doesn't
happen, i.e.:
class ProxyObj(object):
def __init__(self):
self.what = None
or
def f():
pass
class ProxyObj(object):
def __init__(self):
self.what = f
* It also doesn't happen if I make a 'fake' instance method:
def f(self):
pass
class ProxyObj(object):
def __init__(self):
self.what = lambda: f(self)
In this case the reference counts are both '4'.
* No bug if it's a static method or classmethod:
class ProxyObj(object):
def __init__(self):
pass
@staticmethod
def what():
pass
or
class ProxyObj(object):
def __init__(self):
pass
@classmethod
def what():
pass
In both cases, both cases are '3'.
* Basically seems to be an instancemethod issue.
Original comment by csaft...@gmail.com on 17 Jul 2013 at 4:52
* @property is also not a problem, that is:
class ProxyObj(object):
def __init__(self):
pass
@property
def what(self):
return 100
Doesn't cause the leak
Original comment by csaft...@gmail.com on 17 Jul 2013 at 5:48
Original issue reported on code.google.com by
csaft...@gmail.com
on 17 Jul 2013 at 4:40Attachments:
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