[Qt-creator] Extract call graph from QtCreator

[欧三股四]

Hello all, I want to extend QtCreator so that it can display the call graph of a project. I downloaded the source code but just found that it was so complicated. I traced the call hierarchy several times but couldn't found what I need. So can anyone tell me:

(1) How can I extract all Classes in a project ?
(2) How to get all references of a symbol (for example: a function) ?

thanks.
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