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feat(tvix/eval): Forbid Hash{Map,Set}, use Fx instead

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Per https://nnethercote.github.io/perf-book/hashing.html, we have
basically no reason to use the default hasher over a faster,
non-DoS-resistant hasher. This gives a nice perf boost basically for
free:

hello outpath           time:   [704.76 ms 714.91 ms 725.63 ms]
                        change: [-7.2391% -6.1018% -4.9189%] (p = 0.00 < 0.05)
                        Performance has improved.

Change-Id: If5587f444ed3af69f8af4eead6af3ea303b4ae68
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12046
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
Reviewed-by: Ilan Joselevich <personal@ilanjoselevich.com>
Autosubmit: aspen <root@gws.fyi>
This commit is contained in:
Aspen Smith 2024-07-28 12:11:41 -04:00 • committed by clbot
parent 1d7ba89c19
commit b8f92a6d53
17 changed files with 116 additions and 46 deletions
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8
tvix/eval/src/compiler/scope.rs
View file

@ -10,10 +10,8 @@
//! stack indices. To do this, the compiler simulates where locals
//! will be at runtime using the data structures implemented here.
use std::{
collections::{hash_map, HashMap},
ops::Index,
};
use rustc_hash::FxHashMap;
use std::{collections::hash_map, ops::Index};
use smol_str::SmolStr;
@ -168,7 +166,7 @@ pub struct Scope {
pub upvalues: Vec<Upvalue>,
/// Secondary by-name index over locals.
by_name: HashMap<String, ByName>,
by_name: FxHashMap<String, ByName>,
/// How many scopes "deep" are these locals?
scope_depth: usize,