https://github.com/izo0x90/adding-goto-statement-to-python

Just what it sounds like, decorator that patches function bytecode to allow GOTO's *ROFL*
https://github.com/izo0x90/adding-goto-statement-to-python

basic breaking-bad bytecode bytecode-manipulation cpython djikstra donotuse evil-mode fun goto interpreter obscure python python-internals python-interpreter regression ridiculous stackmachine toy-project

Last synced: 6 months ago
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Just what it sounds like, decorator that patches function bytecode to allow GOTO's *ROFL*

• Host: GitHub
• URL: https://github.com/izo0x90/adding-goto-statement-to-python
• Owner: izo0x90
• License: gpl-3.0
• Created: 2021-10-24T13:40:38.000Z (about 4 years ago)
• Default Branch: main
• Last Pushed: 2023-04-03T01:50:28.000Z (over 2 years ago)
• Last Synced: 2025-03-06T04:17:32.521Z (10 months ago)
• Topics: basic, breaking-bad, bytecode, bytecode-manipulation, cpython, djikstra, donotuse, evil-mode, fun, goto, interpreter, obscure, python, python-internals, python-interpreter, regression, ridiculous, stackmachine, toy-project
• Language: Python
• Homepage:
• Size: 30.3 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# Adding GOTO statement into Python

[GOTO Considered harmful](https://homepages.cwi.nl/~storm/teaching/reader/Dijkstra68.pdf) by Edgar Dijkstra

"Your scientists were so preoccupied with whether or not they could, they didn’t stop to think if they should." - That JURASSIC PARK guy

You guys remember basic.

Just what it sounds like, a decorator that patches the bytecode of a decorated function to allow variable assignments to specific string constants to be treated as GOTO/JUMP statements and LABELS to jump to.

Just in case it needs to be said, yes this is a joke and has no actual uses, nor should anyone use it for anything real other than having fun.

![XKCD Comic, GOTO](https://imgs.xkcd.com/comics/goto.png)

All relevant code in main.py. 

Use:

```Python

@goto_mutator            #   << Decorate func you want to patch GOTOs into with mutator

some_func():

  pass                   #   << Do regular stuff

  pass

  pass 

  x = "#GOTO_mylabel"    #   << This is the goto statement, var name does not matter,

                         #      statement has to be a string const, 

                         #      starting with keyword #GOTO_ after that label name

  pass

  pass

  pass                     #  <<  Do more regular stuff, of course after patching 

                           #      the goto statemet will skip right over this secion

                              

  x = "#GOTOLABEL_mylabel" #  << This is the LABEL we will that will be jumped to

  pass 

  pass                     #  << Keep doing stuff 

```

You should be able to define as many jumps and labels as desired, mutator will build a map and patch in jumps. 

Live REPL demo here:

[https://replit.com/@HristoGueorguie/Adding-GOTO-statement-to-Python-cue-eveil-laughter](https://replit.com/@HristoGueorguie/Adding-GOTO-statement-to-Python-cue-eveil-laughter).

---

Links to refs:

[https://rushter.com/blog/python-bytecode-patch/](https://rushter.com/blog/python-bytecode-patch/) - Patching bytecode article by Artem Golubin

[https://www.aosabook.org/en/500L/a-python-interpreter-written-in-python.html](https://www.aosabook.org/en/500L/a-python-interpreter-written-in-python.html) - Python Interpreter in Python article by Allison Kaptur