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如何阅读源码
一些顺手的辅助工具
madge Madge is a developer tool for generating a visual graph of your module dependencies, finding circular dependencies, and give you other useful info.
CodeQuery A code-understanding, code-browsing or code-search tool. This is a tool to index, then query or search C, C++, Java, Python, Ruby, Go and Javascript source code. It builds upon the databases of cscope and ctags, and provides a nice GUI tool. 会写一个 cq.db
glato/emerge: emerge is a source code analysis tool and dependency visualizer