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c9dff5c7d5
## 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.
368 lines
16 KiB
Text
368 lines
16 KiB
Text
---
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source: crates/ruff_python_parser/tests/fixtures.rs
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input_file: crates/ruff_python_parser/resources/valid/expressions/named.py
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---
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## AST
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```
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Module(
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ModModule {
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node_index: AtomicNodeIndex(..),
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range: 0..157,
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body: [
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Expr(
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StmtExpr {
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node_index: AtomicNodeIndex(..),
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range: 0..11,
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value: Named(
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ExprNamed {
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node_index: AtomicNodeIndex(..),
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range: 1..10,
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target: Name(
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ExprName {
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node_index: AtomicNodeIndex(..),
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range: 1..5,
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id: Name("name"),
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ctx: Store,
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},
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),
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value: NumberLiteral(
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ExprNumberLiteral {
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node_index: AtomicNodeIndex(..),
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range: 9..10,
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value: Int(
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0,
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),
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},
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),
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},
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),
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},
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),
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Expr(
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StmtExpr {
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node_index: AtomicNodeIndex(..),
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range: 12..29,
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value: Named(
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ExprNamed {
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node_index: AtomicNodeIndex(..),
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range: 13..28,
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target: Name(
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ExprName {
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node_index: AtomicNodeIndex(..),
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range: 13..17,
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id: Name("name"),
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ctx: Store,
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},
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),
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value: BinOp(
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ExprBinOp {
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node_index: AtomicNodeIndex(..),
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range: 22..27,
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left: Name(
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ExprName {
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node_index: AtomicNodeIndex(..),
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range: 22..23,
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id: Name("x"),
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ctx: Load,
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},
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),
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op: Mult,
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right: Name(
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ExprName {
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node_index: AtomicNodeIndex(..),
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range: 26..27,
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id: Name("y"),
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ctx: Load,
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},
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),
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},
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),
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},
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),
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},
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),
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Expr(
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StmtExpr {
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node_index: AtomicNodeIndex(..),
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range: 30..45,
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value: Named(
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ExprNamed {
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node_index: AtomicNodeIndex(..),
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range: 31..44,
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target: Name(
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ExprName {
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node_index: AtomicNodeIndex(..),
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range: 31..35,
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id: Name("name"),
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ctx: Store,
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},
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),
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value: BinOp(
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ExprBinOp {
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node_index: AtomicNodeIndex(..),
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range: 39..44,
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left: NumberLiteral(
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ExprNumberLiteral {
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node_index: AtomicNodeIndex(..),
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range: 39..40,
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value: Int(
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1,
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),
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},
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),
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op: Add,
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right: NumberLiteral(
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ExprNumberLiteral {
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node_index: AtomicNodeIndex(..),
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range: 43..44,
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value: Int(
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1,
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),
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},
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),
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},
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),
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},
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),
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},
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),
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Expr(
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StmtExpr {
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node_index: AtomicNodeIndex(..),
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range: 46..63,
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value: Named(
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ExprNamed {
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node_index: AtomicNodeIndex(..),
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range: 47..62,
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target: Name(
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ExprName {
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node_index: AtomicNodeIndex(..),
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range: 47..51,
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id: Name("name"),
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ctx: Store,
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},
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),
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value: Tuple(
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ExprTuple {
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node_index: AtomicNodeIndex(..),
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range: 55..62,
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elts: [
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Starred(
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ExprStarred {
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node_index: AtomicNodeIndex(..),
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range: 56..58,
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value: Name(
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ExprName {
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node_index: AtomicNodeIndex(..),
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range: 57..58,
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id: Name("x"),
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ctx: Load,
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},
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),
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ctx: Load,
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},
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),
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Name(
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ExprName {
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node_index: AtomicNodeIndex(..),
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range: 60..61,
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id: Name("y"),
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ctx: Load,
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},
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),
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],
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ctx: Load,
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parenthesized: true,
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},
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),
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},
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),
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},
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),
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Expr(
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StmtExpr {
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node_index: AtomicNodeIndex(..),
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range: 64..90,
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value: Named(
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ExprNamed {
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node_index: AtomicNodeIndex(..),
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range: 65..89,
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target: Name(
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ExprName {
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node_index: AtomicNodeIndex(..),
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range: 65..69,
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id: Name("name"),
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ctx: Store,
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},
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),
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value: If(
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ExprIf {
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node_index: AtomicNodeIndex(..),
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range: 73..89,
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test: BooleanLiteral(
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ExprBooleanLiteral {
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node_index: AtomicNodeIndex(..),
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range: 78..82,
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value: true,
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},
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),
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body: Name(
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ExprName {
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node_index: AtomicNodeIndex(..),
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range: 73..74,
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id: Name("x"),
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ctx: Load,
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},
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),
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orelse: Name(
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ExprName {
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node_index: AtomicNodeIndex(..),
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range: 88..89,
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id: Name("y"),
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ctx: Load,
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},
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),
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},
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),
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},
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),
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},
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),
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Expr(
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StmtExpr {
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node_index: AtomicNodeIndex(..),
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range: 91..112,
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value: Named(
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ExprNamed {
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node_index: AtomicNodeIndex(..),
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range: 92..111,
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target: Name(
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ExprName {
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node_index: AtomicNodeIndex(..),
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range: 92..96,
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id: Name("name"),
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ctx: Store,
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},
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),
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value: Lambda(
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ExprLambda {
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node_index: AtomicNodeIndex(..),
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range: 100..111,
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parameters: Some(
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Parameters {
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range: 107..108,
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node_index: AtomicNodeIndex(
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0,
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),
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posonlyargs: [],
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args: [
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ParameterWithDefault {
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range: 107..108,
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node_index: AtomicNodeIndex(..),
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parameter: Parameter {
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range: 107..108,
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node_index: AtomicNodeIndex(..),
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name: Identifier {
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id: Name("x"),
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range: 107..108,
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node_index: AtomicNodeIndex(..),
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},
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annotation: None,
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},
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default: None,
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},
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],
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vararg: None,
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kwonlyargs: [],
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kwarg: None,
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},
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),
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body: Name(
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ExprName {
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node_index: AtomicNodeIndex(..),
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range: 110..111,
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id: Name("x"),
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ctx: Load,
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},
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),
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},
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),
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},
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),
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},
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),
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Expr(
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StmtExpr {
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node_index: AtomicNodeIndex(..),
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range: 113..132,
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value: Named(
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ExprNamed {
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node_index: AtomicNodeIndex(..),
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range: 114..131,
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target: Name(
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ExprName {
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node_index: AtomicNodeIndex(..),
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range: 114..118,
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id: Name("name"),
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ctx: Store,
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},
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),
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value: Yield(
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ExprYield {
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node_index: AtomicNodeIndex(..),
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range: 123..130,
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value: Some(
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Name(
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ExprName {
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node_index: AtomicNodeIndex(..),
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range: 129..130,
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id: Name("x"),
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ctx: Load,
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},
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),
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),
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},
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),
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},
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),
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},
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),
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Expr(
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StmtExpr {
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node_index: AtomicNodeIndex(..),
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range: 133..157,
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value: Named(
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ExprNamed {
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node_index: AtomicNodeIndex(..),
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range: 134..156,
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target: Name(
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ExprName {
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node_index: AtomicNodeIndex(..),
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range: 134..138,
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id: Name("name"),
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ctx: Store,
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},
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),
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value: YieldFrom(
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ExprYieldFrom {
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node_index: AtomicNodeIndex(..),
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range: 143..155,
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value: Name(
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ExprName {
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node_index: AtomicNodeIndex(..),
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range: 154..155,
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id: Name("x"),
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ctx: Load,
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},
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),
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},
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),
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},
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),
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},
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),
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],
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},
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)
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```
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