codemach¶
Contents:
Small module that executes python code objects.
This module was created to solve the security issues associated with execution of arbitrary code strings. The Machine class can execute python code objects and allow the user to intervene.
Small module that executes python code objects.
Install¶
pip3 install codemach
Development¶
git clone git@github.com:chuck1/codemach
cd codemach
pipenv --python /usr/bin/python3.6
pipenv install
pipenv run pip3 install -e .
pipenv run pytest
Example¶
from codemach import Machine
m = Machine(verbose=True)
s = """
def func(a, b):
return a + b
func(2, 3)"""
c = compile(s, '<string>', 'exec')
m.exec(c)
Below is the output. Each line shows the opname and the stack after the operation.
------------- begin exec
LOAD_CONST [<class 'code'>]
LOAD_CONST [<class 'code'>, "'func'"]
MAKE_FUNCTION ['<codemach.FunctionType object, function=func>']
STORE_NAME []
LOAD_NAME ['<codemach.FunctionType object, function=func>']
LOAD_CONST ['<codemach.FunctionType object, function=func>', '2']
LOAD_CONST ['<codemach.FunctionType object, function=func>', '2', '3']
------------- begin exec
LOAD_FAST ['2']
LOAD_FAST ['2', '3']
BINARY_ADD ['5']
RETURN_VALUE []
------------- return
CALL_FUNCTION ['5']
POP_TOP []
LOAD_CONST ['None']
RETURN_VALUE []
------------- return
Operations¶
140 CALL_FUNCTION_VAR¶
need more testing, but in one test, was used to call a function defined as
def foo(*args):
pass
where TOS1 is the function object and TOS is a tuple of arguments
