perf(transformer): introduce Stack
#6093
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This was referenced Sep 26, 2024
This was referenced Sep 26, 2024
CodSpeed Performance ReportMerging #6093 will not alter performanceComparing Summary
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`Stack` is a stack structure, optimized for fast push/pop and reading/writing the last entry on the stack. The difference from `NonEmptyStack` is that it can be empty. This has a different trade-off vs `NonEmptyStack`: * `Stack::new` does not allocate (`NonEmptyStack` does). * `Stack::last` and `Stack::last_mut` are fallible and contain a branch (those methods on `NonEmptyStack` are branchless and infallible). `Stack` is only the better choice if: 1. You want `new()` not to allocate. or 2. Creating initial value for `NonEmptyStack::new()` is expensive. Use `Stack` as one of the backing stores in `SparseStack`.
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## [0.30.2] - 2024-09-27 ### Features - 60c52ba ast: Allow passing span to `void_0` method (#6065) (Dunqing) - cca433f codegen: Print `vite` / `webpack` special comments (#6021) (Dunqing) - 8d026e1 regular_expression: Implement `GetSpan` for RegExp AST nodes (#6056) (camchenry) - 7764793 regular_expression: Implement visitor pattern trait for regex AST (#6055) (camchenry) - f866781 semantic: Check for type annotations on left side of `for..in` and `for..of` iterators (#6043) (DonIsaac) - 8b2e9aa semantic: Check for JSDoc types in TS type annotations (#6042) (DonIsaac) - 28da771 transformer: Do not transform `**` with bigint literals (#6023) (Boshen) ### Bug Fixes - a88504c diagnostics: Check for terminal when displaying links (#6018) (Boshen) - 418ae25 isolated-declarations: Report uninferrable types in arrays (#6084) (michaelm) - e0a8959 minifier: Compute `void number` as `undefined` (#6028) (Boshen) - 0658576 paresr: Do not report missing initializer error in ambient context (#6020) (Boshen) - b1af73d semantic: Do not create a `global` symbol for `declare global {}` (#6040) (DonIsaac) - c8682e9 semantic,codegen,transformer: Handle definite `!` operator in variable declarator (#6019) (Boshen) ### Performance - 6b7d3ed isolated-declarations: Should clone transformed AST rather than original AST (#6078) (Dunqing) - 85aff19 transformer: Introduce `Stack` (#6093) (overlookmotel) - ad4ef31 transformer: Introduce `NonEmptyStack` (#6092) (overlookmotel) ### Documentation - 3099709 allocator: Document `oxc_allocator` crate (#6037) (DonIsaac) - d60ceb4 oxc: Add README.md and crate-level docs (#6035) (DonIsaac) - efabfc8 semantic: Improve doc comments on `Reference` methods (#6076) (overlookmotel) ### Refactor - 1fc80d1 ast: Move all ts ast related impl methods to `ast_impl` (#6015) (Dunqing) - fe696f0 codegen: Simplify printing annotation comments (#6027) (Dunqing) - e60ce50 transformer: Add `SparseStack::with_capacity` method (#6094) (overlookmotel) - 1399d2c transformer: Move `SparseStack` definition into folder (#6091) (overlookmotel) - 6bd29dd transformer: Add more debug assertions (#6090) (overlookmotel) - c90b9bf transformer: Rename `SparseStack` methods (#6089) (overlookmotel) - 2b380c8 transformer: Remove unsued `self.ctx` (#6022) (Boshen) ### Testing - 93575cd semantic: Add comprehensive regression test suite (#5976) (DonIsaac) - a4cec75 transformer: Enable tests (#6032) (overlookmotel) --------- Co-authored-by: Boshen <1430279+Boshen@users.noreply.github.com> Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
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Stackis a stack structure, optimized for fast push/pop and reading/writing the last entry on the stack. The difference fromNonEmptyStackis that it can be empty.This has a different trade-off vs
NonEmptyStack:Stack::newdoes not allocate (NonEmptyStackdoes).Stack::lastandStack::last_mutare fallible and contain a branch (those methods onNonEmptyStackare branchless and infallible).Stackis only the better choice if:new()not to allocate. orNonEmptyStack::new()is expensive.Use
Stackas one of the backing stores inSparseStack.