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Adrien LUCAS 6c0b2f8cb9
Add option to dump taint graph (#5080) 
* Add option to dump taint graph

* Fix types

* Simplify types

Co-authored-by: Matthew Brown <github@muglug.com>
2021-01-29 11:47:34 +01:00
..
annotating_code Fix broken links in documentation (#4730) 2021-01-29 11:47:04 +01:00
contributing More to contributing docs 2021-01-29 11:47:08 +01:00
manipulating_code Add more accurate description of functionality 2021-01-29 11:39:44 +01:00
running_psalm Update language_server.md 2021-01-29 11:47:27 +01:00
security_analysis Add option to dump taint graph (#5080) 2021-01-29 11:47:34 +01:00
README.md Improve feature list 2021-01-29 11:47:21 +01:00

README.md

About Psalm

Psalm is a static analysis tool that attempts to dig into your program and find as many type-related bugs as possible.

It has a few features that go further than other similar tools:

  • Mixed type warnings
    If Psalm cannot infer a type for an expression then it uses a mixed placeholder type. mixed types can sometimes mask bugs, so keeping track of them helps you avoid a number of common pitfalls.

  • Intelligent logic checks
    Psalm keeps track of logical assertions made about your code, so if ($a && $a) {} and if ($a && !$a) {} are both treated as issues. Psalm also keeps track of logical assertions made in prior code paths, preventing issues like if ($a) {} elseif ($a) {}.

  • Property initialisation checks
    Psalm checks that all properties of a given object have values after the constructor is called.

  • Taint analysis
    Psalm can detect security vulnerabilities in your code.

  • Language Server
    Psalm has a Language Server that’s compatible with a range of different IDEs.

  • Automatic fixes
    Psalm can fix many of the issues it finds automatically.

  • Automatic refactoring
    Psalm can also perform simple refactors from the command line.

Example output

Given a file implode_strings.php:

<?php
$a = ['foo', 'bar'];
echo implode($a, ' ');

> ./vendor/bin/psalm implode_strings.php
ERROR: InvalidArgument - somefile.php:3:14 - Argument 1 of implode expects `string`, `array` provided (see https://psalm.dev/004)

Inspirations

There are two main inspirations for Psalm:

  • Etsy's Phan, which uses nikic's php-ast extension to create an abstract syntax tree
  • Facebook's Hack, a PHP-like language that supports many advanced typing features natively, so docblocks aren't necessary.

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