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[ty] AST garbage collection (#18482)

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## Summary

Garbage collect ASTs once we are done checking a given file. Queries
with a cross-file dependency on the AST will reparse the file on demand.
This reduces ty's peak memory usage by ~20-30%.

The primary change of this PR is adding a `node_index` field to every
AST node, that is assigned by the parser. `ParsedModule` can use this to
create a flat index of AST nodes any time the file is parsed (or
reparsed). This allows `AstNodeRef` to simply index into the current
instance of the `ParsedModule`, instead of storing a pointer directly.

The indices are somewhat hackily (using an atomic integer) assigned by
the `parsed_module` query instead of by the parser directly. Assigning
the indices in source-order in the (recursive) parser turns out to be
difficult, and collecting the nodes during semantic indexing is
impossible as `SemanticIndex` does not hold onto a specific
`ParsedModuleRef`, which the pointers in the flat AST are tied to. This
means that we have to do an extra AST traversal to assign and collect
the nodes into a flat index, but the small performance impact (~3% on
cold runs) seems worth it for the memory savings.

Part of https://github.com/astral-sh/ty/issues/214.
This commit is contained in:
Ibraheem Ahmed 2025-06-13 08:40:11 -04:00 • committed by GitHub
parent 76d9009a6e
commit c9dff5c7d5
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824 changed files with 25243 additions and 804 deletions
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10
crates/ruff_python_parser/tests/snapshots/valid_syntax@other__atom.py.snap
View file

@ -1,20 +1,22 @@
---
source: crates/ruff_python_parser/tests/fixtures.rs
input_file: crates/ruff_python_parser/resources/valid/other/atom.py
snapshot_kind: text
---
## AST
```
Module(
ModModule {
node_index: AtomicNodeIndex(..),
range: 0..73,
body: [
Expr(
StmtExpr {
node_index: AtomicNodeIndex(..),
range: 0..3,
value: EllipsisLiteral(
ExprEllipsisLiteral {
node_index: AtomicNodeIndex(..),
range: 0..3,
},
),
@ -22,9 +24,11 @@ Module(
),
Expr(
StmtExpr {
node_index: AtomicNodeIndex(..),
range: 4..8,
value: BooleanLiteral(
ExprBooleanLiteral {
node_index: AtomicNodeIndex(..),
range: 4..8,
value: true,
},
@ -33,9 +37,11 @@ Module(
),
Expr(
StmtExpr {
node_index: AtomicNodeIndex(..),
range: 9..14,
value: BooleanLiteral(
ExprBooleanLiteral {
node_index: AtomicNodeIndex(..),
range: 9..14,
value: false,
},
@ -44,9 +50,11 @@ Module(
),
Expr(
StmtExpr {
node_index: AtomicNodeIndex(..),
range: 15..19,
value: NoneLiteral(
ExprNoneLiteral {
node_index: AtomicNodeIndex(..),
range: 15..19,
},
),