Looking for a tool to grok large projects, a la cscope. methods(method_name) is good but insufficient. For those unfamiliar with cscope, it allows the following queries:
Find this C symbol: Find this global definition: Find functions called by this function: Find functions calling this function: Find this text string: Change this text string: Find this egrep pattern: Find this file: Find files #including this file: Find assignments to this symbol: