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Java Virtual Machine implementation in Python

License: GNU Affero General Public License v3.0

Java 14.82% Python 85.03% Shell 0.15%

python jvm jvm-bytecode java

python-jvm-interpreter's Introduction

JVM implementation in Python

python-jvm-interpreter is an implementation of the Java Virtual Machine in Python. It works by parsing and interpreting the Java Class files.

Dependencies

In order to compile Java code to Java Bytecode, you will need to have javac. If you just want to run bytecode that is already compiled, all you need is a Python interpreter.

Running the tests

The project comes with a number of unit tests. If you run the shell script test.sh, it will compile the Java files in the example directory and run the unit tests. You will be able to see how many test passed and how many failed.

Even if you haven't touched anything critical, it is always a good idea to run the unit tests after each change. This will make sure that nothing breaks, and if it does you will immediately know why it broke.

As more functionality is implemented, the amount of test cases should be increased in order to make it easier to check if anything is broken.

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python-jvm-interpreter's Issues

Undefined name 'ip' in ./pyjvm/Machine.py

Should this be frame.ip instead of ip?

flake8 testing of https://github.com/gkbrk/python-jvm-interpreter on Python 3.7.0

$ flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics

./pyjvm/Machine.py:483:79: F821 undefined name 'ip'
                        cl.handleMethod('<clinit>', '()V', frame, code, self, ip)
                                                                              ^
1     F821 undefined name 'ip'
1

$ sh test.sh
EEEE............EE
======================================================================
ERROR: test_cocktail_sort (__main__.ArrayTest.test_cocktail_sort)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "E:/msys64/home/topkek/t/a/python-jvm-interpreter/run_unittest.py", line 89, in setUp
    self.jvm.load_class_file('example/ArrayTest.class')
  File "E:/msys64/home/topkek/t/a/python-jvm-interpreter/pyjvm/Machine.py", line 378, in load_class_file
    c = ClassFile().from_file(path)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "E:/msys64/home/topkek/t/a/python-jvm-interpreter/pyjvm/ClassFile.py", line 80, in from_file
    c = CPInfo().from_reader(cf)
        ^^^^^^^^^^^^^^^^^^^^^^^^
  File "E:/msys64/home/topkek/t/a/python-jvm-interpreter/pyjvm/CPInfo.py", line 20, in from_reader
    self.tag = CPTag(tag)
               ^^^^^^^^^^
  File "E:/msys64/ucrt64/lib/python3.11/enum.py", line 712, in __call__
    return cls.__new__(cls, value)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "E:/msys64/ucrt64/lib/python3.11/enum.py", line 1135, in __new__
    raise ve_exc
ValueError: 18 is not a valid CPTag

======================================================================
ERROR: test_insertion_sort (__main__.ArrayTest.test_insertion_sort)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "E:/msys64/home/topkek/t/a/python-jvm-interpreter/run_unittest.py", line 89, in setUp
    self.jvm.load_class_file('example/ArrayTest.class')
  File "E:/msys64/home/topkek/t/a/python-jvm-interpreter/pyjvm/Machine.py", line 378, in load_class_file
    c = ClassFile().from_file(path)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "E:/msys64/home/topkek/t/a/python-jvm-interpreter/pyjvm/ClassFile.py", line 80, in from_file
    c = CPInfo().from_reader(cf)
        ^^^^^^^^^^^^^^^^^^^^^^^^
  File "E:/msys64/home/topkek/t/a/python-jvm-interpreter/pyjvm/CPInfo.py", line 20, in from_reader
    self.tag = CPTag(tag)
               ^^^^^^^^^^
  File "E:/msys64/ucrt64/lib/python3.11/enum.py", line 712, in __call__
    return cls.__new__(cls, value)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "E:/msys64/ucrt64/lib/python3.11/enum.py", line 1135, in __new__
    raise ve_exc
ValueError: 18 is not a valid CPTag

======================================================================
ERROR: test_loop_multiple (__main__.ArrayTest.test_loop_multiple)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "E:/msys64/home/topkek/t/a/python-jvm-interpreter/run_unittest.py", line 89, in setUp
    self.jvm.load_class_file('example/ArrayTest.class')
  File "E:/msys64/home/topkek/t/a/python-jvm-interpreter/pyjvm/Machine.py", line 378, in load_class_file
    c = ClassFile().from_file(path)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "E:/msys64/home/topkek/t/a/python-jvm-interpreter/pyjvm/ClassFile.py", line 80, in from_file
    c = CPInfo().from_reader(cf)
        ^^^^^^^^^^^^^^^^^^^^^^^^
  File "E:/msys64/home/topkek/t/a/python-jvm-interpreter/pyjvm/CPInfo.py", line 20, in from_reader
    self.tag = CPTag(tag)
               ^^^^^^^^^^
  File "E:/msys64/ucrt64/lib/python3.11/enum.py", line 712, in __call__
    return cls.__new__(cls, value)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "E:/msys64/ucrt64/lib/python3.11/enum.py", line 1135, in __new__
    raise ve_exc
ValueError: 18 is not a valid CPTag

======================================================================
ERROR: test_sum (__main__.ArrayTest.test_sum)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "E:/msys64/home/topkek/t/a/python-jvm-interpreter/run_unittest.py", line 89, in setUp
    self.jvm.load_class_file('example/ArrayTest.class')
  File "E:/msys64/home/topkek/t/a/python-jvm-interpreter/pyjvm/Machine.py", line 378, in load_class_file
    c = ClassFile().from_file(path)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "E:/msys64/home/topkek/t/a/python-jvm-interpreter/pyjvm/ClassFile.py", line 80, in from_file
    c = CPInfo().from_reader(cf)
        ^^^^^^^^^^^^^^^^^^^^^^^^
  File "E:/msys64/home/topkek/t/a/python-jvm-interpreter/pyjvm/CPInfo.py", line 20, in from_reader
    self.tag = CPTag(tag)
               ^^^^^^^^^^
  File "E:/msys64/ucrt64/lib/python3.11/enum.py", line 712, in __call__
    return cls.__new__(cls, value)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "E:/msys64/ucrt64/lib/python3.11/enum.py", line 1135, in __new__
    raise ve_exc
ValueError: 18 is not a valid CPTag

======================================================================
ERROR: test_reverse_string (__main__.StringTest.test_reverse_string)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "E:/msys64/home/topkek/t/a/python-jvm-interpreter/run_unittest.py", line 56, in setUp
    self.jvm.load_class_file('example/StringTest.class')
  File "E:/msys64/home/topkek/t/a/python-jvm-interpreter/pyjvm/Machine.py", line 378, in load_class_file
    c = ClassFile().from_file(path)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "E:/msys64/home/topkek/t/a/python-jvm-interpreter/pyjvm/ClassFile.py", line 80, in from_file
    c = CPInfo().from_reader(cf)
        ^^^^^^^^^^^^^^^^^^^^^^^^
  File "E:/msys64/home/topkek/t/a/python-jvm-interpreter/pyjvm/CPInfo.py", line 20, in from_reader
    self.tag = CPTag(tag)
               ^^^^^^^^^^
  File "E:/msys64/ucrt64/lib/python3.11/enum.py", line 712, in __call__
    return cls.__new__(cls, value)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "E:/msys64/ucrt64/lib/python3.11/enum.py", line 1135, in __new__
    raise ve_exc
ValueError: 18 is not a valid CPTag

======================================================================
ERROR: test_rot13_hello_world (__main__.StringTest.test_rot13_hello_world)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "E:/msys64/home/topkek/t/a/python-jvm-interpreter/run_unittest.py", line 56, in setUp
    self.jvm.load_class_file('example/StringTest.class')
  File "E:/msys64/home/topkek/t/a/python-jvm-interpreter/pyjvm/Machine.py", line 378, in load_class_file
    c = ClassFile().from_file(path)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "E:/msys64/home/topkek/t/a/python-jvm-interpreter/pyjvm/ClassFile.py", line 80, in from_file
    c = CPInfo().from_reader(cf)
        ^^^^^^^^^^^^^^^^^^^^^^^^
  File "E:/msys64/home/topkek/t/a/python-jvm-interpreter/pyjvm/CPInfo.py", line 20, in from_reader
    self.tag = CPTag(tag)
               ^^^^^^^^^^
  File "E:/msys64/ucrt64/lib/python3.11/enum.py", line 712, in __call__
    return cls.__new__(cls, value)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "E:/msys64/ucrt64/lib/python3.11/enum.py", line 1135, in __new__
    raise ve_exc
ValueError: 18 is not a valid CPTag

----------------------------------------------------------------------
Ran 18 tests in 0.236s

FAILED (errors=6)

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gkbrk / python-jvm-interpreter Goto Github PK

python-jvm-interpreter's Introduction

JVM implementation in Python

Dependencies

Running the tests

python-jvm-interpreter's People

Contributors

Stargazers

Watchers

Forkers

python-jvm-interpreter's Issues

Undefined name 'ip' in ./pyjvm/Machine.py

Please add some annotation. Thanks.

Add transpiler

Errors

Recommend Projects

React

Vue.js

Typescript

TensorFlow

Django

Laravel

D3

Recommend Topics

javascript

web

server

Machine learning

Visualization

Game

Recommend Org

Facebook

Microsoft

Google

Alibaba

D3

Tencent