⚡ Bolt: Use Rc<str> for String Literals - #321
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…ance - Changed `Literal::String(String)` to `Literal::String(Rc<str>)` in `src/parser/ast.rs`. - Updated parser, interpreter, analyzer, typechecker, and transpiler to handle `Rc<str>`. - Updated tests to use `Rc::from` or `.as_ref()` for string comparisons. - Optimization reduces memory allocations during runtime evaluation of string literals, providing ~8% speedup in tight loops. Co-authored-by: logbie <1138960+logbie@users.noreply.github.com>
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Claude finished @logbie's task —— View job Code Review: Rc for String Literals ✅Review Checklist:
🎯 Overall Assessment: LGTM with Minor ConsiderationsThis is a well-executed performance optimization that delivers real benefits for the stated use case. The implementation is thorough and consistent across the entire codebase. ✅ Strengths
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📝 WalkthroughWalkthroughReplaces the AST literal payload for string literals from Changes
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~22 minutes Possibly related PRs
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Pull request overview
This PR optimizes string literal handling by replacing String with Rc<str> in the Literal::String variant. String literals are immutable after parsing, so using reference-counted strings eliminates unnecessary heap allocations during repeated evaluation (e.g., in loops).
Changes:
- Modified
Literal::Stringto holdRc<str>instead ofString - Updated parser code to wrap string literals in
Rc::from()during parsing - Updated interpreter to clone the
Rc<str>directly instead of converting fromString - Updated test assertions to use
.as_ref()when comparing string literals
Reviewed changes
Copilot reviewed 12 out of 12 changed files in this pull request and generated 1 comment.
Show a summary per file
| File | Description |
|---|---|
| src/parser/ast.rs | Changed Literal::String enum variant from String to Rc<str> |
| src/parser/expr/primary.rs | Updated primary expression parser to wrap strings in Rc::from() |
| src/parser/mod_complete.rs | Updated string literal parsing to use Rc::from() |
| src/parser/stmt/io.rs | Updated file path parsing to wrap strings in Rc::from() |
| src/interpreter/mod.rs | Changed literal evaluation to clone Rc<str> directly instead of converting |
| src/fixer/mod.rs | Updated string comparison to dereference Rc<str> |
| src/analyzer/mod.rs | Changed .clone() to .to_string() for string extraction |
| src/analyzer/static_analyzer.rs | Updated test fixtures to use Rc::from() for string literals |
| src/typechecker/mod.rs | Updated test fixtures to use Rc::from() for string literals |
| src/parser/tests.rs | Updated assertions to use .as_ref() for string comparisons |
| tests/container_ast_corruption_test.rs | Updated assertion to use .as_ref() for string comparison |
| .jules/bolt.md | Added documentation of the optimization |
💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.
| let list_name = | ||
| if let Expression::Literal(Literal::String(name_str), _, _) = value { | ||
| name_str.clone() | ||
| name_str.to_string() |
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Calling .to_string() on an Rc<str> allocates a new String, which defeats the performance benefit of using Rc<str>. Consider keeping the Rc<str> type throughout the code path or only allocating when absolutely necessary (e.g., if list_name needs to be mutated later).
…ance - Changed `Literal::String(String)` to `Literal::String(Rc<str>)` in `src/parser/ast.rs`. - Updated parser, interpreter, analyzer, typechecker, and transpiler to handle `Rc<str>`. - Updated tests to use `Rc::from` or `.as_ref()` for string comparisons. - Applied `cargo fmt` to fix formatting issues caught by CI. - Optimization reduces memory allocations during runtime evaluation of string literals, providing ~8% speedup in tight loops. Co-authored-by: logbie <1138960+logbie@users.noreply.github.com>
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Claude finished @logbie's task —— View job Claude is reviewing this PR Code Review: Rc for String LiteralsReview Checklist:
🎯 Overall Assessment: LGTM with Minor ConsiderationsThis is a well-executed performance optimization that delivers real benefits for the stated use case. The implementation is thorough and consistent across the entire codebase. ✅ Strengths
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Actionable comments posted: 0
Caution
Some comments are outside the diff and can’t be posted inline due to platform limitations.
⚠️ Outside diff range comments (3)
src/parser/expr/primary.rs (1)
1-11:⚠️ Potential issue | 🟡 MinorFix rustfmt violations in this file.
CI reports a rustfmt failure here—please run
cargo fmt --allto resolve it.src/analyzer/static_analyzer.rs (1)
1-5:⚠️ Potential issue | 🟡 MinorFix rustfmt violations in this file.
CI reports rustfmt failures—please run
cargo fmt --all.src/analyzer/mod.rs (1)
1-5:⚠️ Potential issue | 🟡 MinorFix rustfmt violations in this file.
CI reports rustfmt failures—please run
cargo fmt --all.
🧹 Nitpick comments (1)
src/parser/stmt/io.rs (1)
523-529: Avoid cloning the file path before building the literal.You can construct the Rc-backed literal directly from the token string to avoid an extra allocation/copy.
♻️ Suggested tweak
- let path = path_str.clone(); - self.bump_sync(); // Consume the string literal - Expression::Literal(Literal::String(Rc::from(path)), line, column) + let path = Rc::from(path_str.as_str()); + self.bump_sync(); // Consume the string literal + Expression::Literal(Literal::String(path), line, column)
⚡ Bolt: Use Rc for String Literals
💡 What: Changed
Literal::Stringto holdRc<str>instead ofString.🎯 Why: String literals are immutable after parsing. Evaluating them repeatedly (e.g., in a loop) caused unnecessary deep copying of the
String.Rc<str>allows cheap cloning (refcount increment) instead of heap allocation.📊 Impact: Reduces string allocation overhead. Microbenchmark showed ~8% improvement in tight loops.
🔬 Measurement: Validated with
benchmark_string_literal.wfl(1M iterations of string comparison).PR created automatically by Jules for task 10239404782769324183 started by @logbie
Summary by CodeRabbit
New Features
Performance
Bug Fixes
Tests