https://github.com/mheiber/lsbsteak

https://github.com/mheiber/lsbsteak

Last synced: 21 days ago
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• Host: GitHub
• URL: https://github.com/mheiber/lsbsteak
• Owner: mheiber
• Created: 2024-08-03T20:43:33.000Z (5 months ago)
• Default Branch: main
• Last Pushed: 2024-08-29T14:58:42.000Z (4 months ago)
• Last Synced: 2024-10-16T01:44:13.254Z (2 months ago)
• Language: Alloy
• Size: 100 MB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Alloy modelling for sound late static bindings

![screnshot](./screenshot.png)

This repo models potential Hack language feautures for sound

[Late Static Bindings](https://www.php.net/manual/en/language.oop5.late-static-bindings.php).

You can ask the Alloy model for examples of valid Hack programs and ask it to check safety properties for you.

Here's an example of a generated Hack program:

```

>

abstract class AbstractClass0 {

  public static abstract function m1(): void /* AbstractMethod$1*/;

  public static function m0(): void /* ConcreteMethod$0*/ {}

}

abstract class AbstractClass1 extends AbstractClass0 {

  public static abstract function m1(): void /* AbstractMethod$2*/;

  // type errors: CantOverrideNonConcreteClassMethodWithConcreteClassMethod

  <<__ConcreteClass>>

  public static function m0(): void /* ConcreteMethod$1*/ {

   // Runtime fatal!

   static::m1();    // Call$0 resolves to AbstractMethod$2

  }

}

<<__EntryPoint>>

function main(): void {

  let $v0 : classname = AbstractClass1::class;

  let $v1 : classname = $v0;

  $v1::m0();    // Call$1 resolves to ConcreteMethod$1

}

```

which can be easier to digest than [a graph representation](./analyzer.png).

Demo: [./demo.mov](./demo.mov)

## How to Run

Use with this custom build of Alloy that understands how to use custom visualizations: [mheiber/org.alloytools.alloy](https://github.com/mheiber/org.alloytools.alloy/). See instructions there, which use the examples from this repo.