Alex Crichton f749c7cf95 Don't use JSON for custom section format ... This commit migrates away from using Serde for the custom section in wasm executables. This is a refactoring of a purely-internal data structure to `wasm-bindgen` and should have no visible functional change on users. The motivation for this commit is two fold: * First, the compile times using `serde_json` and `serde_derive` for the syntax extension isn't the most fun. * Second, eventually we're going to want to stablize the layout of the custom section, and it's highly unlikely to be json! Primarily, though, the intention of this commit is to improve the cold-cache compile time of `wasm-bindgen` by ensuring that for new users this project builds as quickly as possible. By removing some heavyweight dependencies from the procedural macro, `serde`, `serde_derive`, and `serde_json`, we're able to get a pretty nice build time improvement for the `wasm-bindgen` crate itself: | | single-core build | parallel build | |-------------|-------------------|----------------| | master | 36.5s | 17.3s | | this commit | 20.5s | 11.8s | These are't really end-all-be-all wins but they're much better especially on the spectrum of weaker CPUs (in theory modeled by the single-core case showing we have 42% less CPU work in theory).		2018-10-12 11:23:00 -07:00
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src	Don't use JSON for custom section format	2018-10-12 11:23:00 -07:00
Cargo.toml	Don't use JSON for custom section format	2018-10-12 11:23:00 -07:00