README

A library for PHP exposing libclang via FFI.

It allows easy traversing and analyzing of an abstract syntax tree of a c / c++ file.

Unfortunately PHP FFI does not currently support Struct By Value as parameter or return value in function calls. That is why a c based wrapper is provided for libclang itself, which can then be bound via FFI. This wrapper must be compiled before use.

The wrapper is taken from dart ffigen and has been slightly extended.

Expect breaking changes along all 0.* pre-releases.

Requirements

• PHP >= 7.4
• FFI extension enabled
• LLVM >= 9 with clang and libclang-dev

Quick Start

Install llvm with clang ...

... on macOS (see https://formulae.brew.sh/formula/llvm)

brew install llvm@11

... on Debian / Ubuntu (see https://apt.llvm.org/)

apt-get update; \
apt-get install wget lsb-release software-properties-common ca-certificates gnupg; \
wget -q https://apt.llvm.org/llvm.sh; \
chmod +x llvm.sh; \
sudo ./llvm.sh 11; \
apt-get install libclang-11-dev;

Install in your project

composer require klitsche/clang-ffi

Add to composer.json (this will trigger compilation of wrapped libclang library)

"scripts": {
    "post-autoload-dump": "Klitsche\\Clang\\FFI\\libclang\\Compiler::run",
},

Dump autoload to trigger compilation

composer dump-autoload

Run examples

Checkout & prepare

git clone https://github.com/klitsche/clang-ffi.git; \
cd clang-ffi; \
docker-compose build;

Print parsed file

docker-compose run --rm php74 php examples/print.php

Collect and dump simplified AST nodes as json

docker-compose run --rm php74 php examples/json.php

Dump found issues during parsing

docker-compose run --rm php74 php examples/issues.php

Todos

• Add ffigen
• Add multiversion support for llvm >9 (some const values are different)
• Add documentation
• Add support for Windows

License

See LICENSE.md for details.

LICENSE.wrapper.c.md covers file src/FFI/libclang/wrapper.c.