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refactor(tvix/eval): Don't double-box Path values

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PathBuf internally contains a heap pointer (an OsString), so we were in
effect double-boxing here. Removing the extra layer by making
Tvix::Value represented by a Box<Path> rather than a Box<PathBuf> saves
us an indirection, while still avoiding the extra memory overhead of the
capacity which was the reason we were boxing PathBuf in the first place.

Change-Id: I8c185b9d4646161d1921917f83e87421496a3e24
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10725
Reviewed-by: sterni <sternenseemann@systemli.org>
Autosubmit: aspen <root@gws.fyi>
Tested-by: BuildkiteCI
This commit is contained in:
Aspen Smith 2024-01-31 10:19:13 -05:00 • committed by aspen
parent 201173afac
commit d3d41552cf
6 changed files with 23 additions and 20 deletions
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14
tvix/eval/src/value/mod.rs
View file

@ -3,7 +3,7 @@
use std::cmp::Ordering;
use std::fmt::Display;
use std::num::{NonZeroI32, NonZeroUsize};
use std::path::PathBuf;
use std::path::{Path, PathBuf};
use std::rc::Rc;
use bstr::{BString, ByteVec};
@ -50,7 +50,7 @@ pub enum Value {
String(NixString),
#[serde(skip)]
Path(Box<PathBuf>),
Path(Box<Path>),
Attrs(Box<NixAttrs>),
List(NixList),
@ -76,7 +76,7 @@ pub enum Value {
#[serde(skip)]
DeferredUpvalue(StackIdx),
#[serde(skip)]
UnresolvedPath(Box<PathBuf>),
UnresolvedPath(Box<Path>),
#[serde(skip)]
Json(serde_json::Value),
@ -349,7 +349,7 @@ impl Value {
import_paths: true, ..
},
) => {
let imported = generators::request_path_import(co, *p).await;
let imported = generators::request_path_import(co, p.to_path_buf()).await;
// When we import a path from the evaluator, we must attach
// its original path as its context.
context = context.append(NixContextElement::Plain(
@ -363,7 +363,7 @@ impl Value {
import_paths: false,
..
},
) => Ok(p.into_os_string().into_encoded_bytes().into()),
) => Ok((*p).as_os_str().as_encoded_bytes().into()),
// Attribute sets can be converted to strings if they either have an
// `__toString` attribute which holds a function that receives the
@ -705,7 +705,7 @@ impl Value {
Value::String(s),
s.clone()
);
gen_cast!(to_path, Box<PathBuf>, "path", Value::Path(p), p.clone());
gen_cast!(to_path, Box<Path>, "path", Value::Path(p), p.clone());
gen_cast!(to_attrs, Box<NixAttrs>, "set", Value::Attrs(a), a.clone());
gen_cast!(to_list, NixList, "list", Value::List(l), l.clone());
gen_cast!(
@ -1009,7 +1009,7 @@ impl From<f64> for Value {
impl From<PathBuf> for Value {
fn from(path: PathBuf) -> Self {
Self::Path(Box::new(path))
Self::Path(path.into_boxed_path())
}
}