klitsche / ffigen
FFI binding generator
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Requires
- php: ^7.4 || ^8.0
- brick/varexporter: ^0.3.2
- ircmaxell/php-c-parser: dev-master#fd8f5efefd0fcc6c5119d945694acaa3a6790ada
- symfony/console: ^5.0
- symfony/filesystem: ^5.0
- symfony/yaml: ^5.0
Requires (Dev)
- phpunit/phpunit: ^9.1
- symplify/easy-coding-standard: ^11.2
README
ffigen
is a simple cli helper to quickly generate and update low level PHP FFI bindings for C libraries.
It generates two PHP files out of provided C header file(s):
constants.php
- holding constant valuesMethods.php
- holding function bindings as static methods plus phpdoc in a trait
It is heavily inspired by FFIMe and depends on PHPCParser by ircmaxell.
WIP: Expect breaking changes along all 0.* pre-releases.
Requirements
- PHP ^7.4 || ^8.0
- For examples: FFI extension must be available and enabled
Quick Start
Install in your project:
composer require --dev klitsche/ffigen
Install a c library (eg. uuid).
Add a config file to your project root:
.ffigen.yml
Tweak this config file (example):
headerFiles: - uuid/uuid.h libraryFile: libuuid.so.1 parserClass: Klitsche\FFIGen\Examples\UUID\FFIGen\Parser outputPath: ./ excludeConstants: - /^(?!(FFI|UUID)_).*/ excludeMethods: namespace: Klitsche\FFIGen\Examples\UUID
Optional: add your own Parser class to customize pre oder post processing logic (example):
<?php declare(strict_types=1); namespace Klitsche\FFIGen\Examples\UUID\FFIGen; use Klitsche\FFIGen\Config; class Parser extends \Klitsche\FFIGen\Adapter\PHPCParser\Parser { public function __construct(Config $config) { parent::__construct($config); $this->context->defineInt('_SYS_TYPES_H', 1); $this->context->defineInt('_SYS_TIME_H', 1); $this->context->defineInt('_TIME_H', 1); } protected function parseHeaderFile(string $file): array { $file = $this->searchHeaderFilePath($file); $prependHeaderFile = ' typedef long time_t; '; $tmpfile = tempnam(sys_get_temp_dir(), 'ffigen'); file_put_contents($tmpfile, $prependHeaderFile . file_get_contents($file)); $declarations = parent::parseHeaderFile($tmpfile); unlink($tmpfile); return $declarations; } private function searchHeaderFilePath(string $file): string { if (file_exists($file)) { return $file; } foreach ($this->context->headerSearchPaths as $headerSearchPath) { if (file_exists($headerSearchPath . '/' . $file)) { return $headerSearchPath . '/' . $file; } } throw new \RuntimeException(sprintf('File not found: %s', $file)); } }
Do not forget to register the Parser namespace in your composer.json for autoloading (dev is okay):
"autoload-dev": { "psr-4": { "Klitsche\\FFIGen\\Examples\\": "examples" } },
Dump autoloading with
composer dump-autoload
Run ffigen to generate binding files
vendor/bin/ffigen
This generates the two files in the output path:
constants.php
- add this to your autoloadingMethods.php
- add this to your own class context and use it within your own high level php library
Do not forget to add constants.php
to your compose.json for autoloading:
"autoload": { "files": [ "tweak-path-to/constants.php", ] },
Play with examples
Build docker image with preinstalled c libraries (uuid, snappy & librdkafka):
docker-compose build php74
Run uuid example
docker-compose run --rm php74 php bin/ffigen generate -c examples/UUID/.ffigen.yml
docker-compose run --rm php74 php examples/UUID/test.php
Run snappy example (see Snappy class for a simple high level example)
docker-compose run --rm php74 bin/ffigen generate -c examples/Snappy/.ffigen.yml
docker-compose run --rm php74 php examples/Snappy/test.php
Run rdkafka example (librdkafka 1.5.2 & mock cluster)
docker-compose run --rm php74 bin/ffigen generate -c examples/RdKafka/.ffigen.yml
docker-compose run --rm php74 php examples/RdKafka/test.php
Todos
- Add travis
- Add more tests
- Add documentation
- Add support for Windows, macOS
- Add more examples (and learn from them)
- Think about multi version support
- Think about custom interface / class generation for types
- Think about clang / cpp / readelf adapter (cpp defines only & clean file, clang -c11 ast-dump=json, readelf --dyn-syms)