連結：https://railsware.com/blog/2014/02/28/creation-and-using-clang-plugin-with-xcode/

如何寫一個clang plugin，很不錯的文章，記錄一下。

This tutorial describes how to create Clang plugin and covers the next things:

• environment setup
• basic plugin setup
• setup Xcode project for plugin development
• warnings reporting
• errors reporting
• Xcode integration
• interactive hints for errors/warnings riddance

tl;dr

Clang Rocks!!!

You can find the plugin here.

Intro

While working on BloodMagic, I realised that it’d be nice to have a tool for checking semantic errors related to BM usage. For example: in the interface property marked as lazy

I concluded that I need to work with and I need a full-featured parser.

I’ve tried different approaches: flex+bison, libclang, but ultimately I decided to write a Clang plugin.

Just for testing purposes I’ve started a simple plugin with the following goals:

• use Xcode for development
• integrate ready plugin into Xcode and use it workaday
• plugin should report warnings, errors and propose interactive hints for fixes (via Xcode UI)

Features of the test plugin:

• report warning in case of class’ name starts with lowercase letter
• report error in case of class’ name contains underscore _
• propose hints for fixes

Environment setup

For plugin development we need llvm/clang, built from source

Current clang version on my system – 3.3.1, so let’s build respective version:

Basic plugin setup

Create directory for plugin

Our plugin based on example from Clang repo and here is it’s structure:

We’ll use one source file for simplification