Rust usage by lines of code has gone up from 3.7% to 6.24%
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We now have a total of 405,379 lines of Rust vs 6,091,861 lines of C/C++.
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More interestingly at this point the amount of Rust has increased by 172,839 lines of code vs 38,241 for C/C++. This is the cumulative amount of additions and removals over the last year. For a large part of the year C++ was trending down.
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So at this point we've added 4.5X as much Rust as C/C++ over the past year! Note: this number is volatile as we tend to add large chunks of code on both sides (think WebRTC, WebRender, etc). Overall it looks like we're trending towards adding more Rust and removing more C++
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5/6
Tech details: these numbers were derived by downloading 78 builds over the past year, extracting their debug symbols, and them mapping them to in-tree files with a tool @TedMielczarek put together for the June 2018 Firefox all-hands.
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