Bump Jint from 4.11.0 to 4.12.0

[dependabot]

Updated Jint from 4.11.0 to 4.12.0.

Release notes

Sourced from Jint's releases.

4.12.0

Jint 4.12.0 is a performance- and correctness-focused release. It completes the move to hidden-class shapes across the whole object model, extends the unboxed interpreter fast lanes to more operators and call shapes, and adds a layer of per-engine caching so re-executed scripts and re-created functions reuse their compiled metadata and environments. A pre-release review of everything since 4.11.0 also fixed several correctness regressions. No code changes are required to benefit.

Highlights

Object model — shapes everywhere. The hidden-class shape model now backs the built-in prototypes and constructors, TypedArrays, the global object, and Intl / Temporal (#​2580, #​2581, #​2582, #​2590, #​2595, #​2597). JSON.parse builds its result objects as shapes, so an array of like-shaped records costs one allocation per record instead of a property dictionary each (#​2634). Object literals inside generator/async frames and object spread {...src} adopt shapes too (#​2596, #​2648, #​2635), and a provably-simple constructor shapes its instances from the third construction (#​2636).

Interpreter fast lanes. New unboxed operand lanes for equality, bitwise, modulo-equality and sum-of-products expressions remove per-iteration boxing (#​2602, #​2604, #​2611, #​2628), and comparison operands are served from the validated global-descriptor cache (#​2603). Expression-only and if/else for-loop bodies run through a tight per-iteration cycle with a member-bound loop test (i < arr.length) (#​2605, #​2617, #​2623), env-less leaf calls run against the captured environment directly (#​2627), and functions that cannot observe their this skip this-binding (#​2626).

Caching & reuse. Nested-scope global reads and writes are served from a validated global-binding cache (#​2584, #​2625); hoisted function and class definitions, and the top-level statement handler tree, are reused across re-evaluations on an engine (#​2613, #​2615, #​2649); and for-of / for-in reuse a fixed-slot per-iteration environment, skipping per-iteration TDZ re-init where it is provably safe (#​2586, #​2632).

Lower allocations. A coverage campaign added benchmarks for common patterns the suite did not exercise and then closed the hotspots they surfaced (#​2630): resolved await chains and engine-internal promise reactions (#​2639), for-in enumeration (#​2640), throw/catch (#​2641), primitive number/boolean/bigint methods (no wrapper object, #​2642), and tagged templates (#​2638) all allocate far less.

Correctness. Fixes for sticky + global [Symbol.match] returning wrong results (#​2600), an unlabeled break escaping a labeled switch (#​2607), -0 in integer multiplication (#​2620), and raw property writes on shaped hosts (#​2591, #​2601). A pre-release review (#​2651) additionally fixed for-in re-enumerating a shadowed key (a mid-loop delete and a pooled-iterator reuse case), mapped-arguments writes being lost after the call returns (and duplicate-parameter mapping now follows the spec), and hardened the object-literal and built-in-shape paths.

Across the managed JavaScript engines for .NET, Jint 4.12.0 is the fastest engine on 17 of the 21 comparison scripts — and the fastest interpreter on all 21 — leading by up to ~5.4× over the next-fastest engine while allocating 2×–63× less memory than the closest competitor. See the engine comparison benchmarks for the full table.

What's Changed

• Built-in shapes for prototypes and constructors: composable storage, accessors, aliases by @​lahma in Built-in shapes for prototypes and constructors: composable storage, accessors, aliases sebastienros/jint#2580
• Shape Number/%TypedArray% constructors and %TypedArray%.prototype; add [JsInstanceSlot] by @​lahma in Shape Number/%TypedArray% constructors and %TypedArray%.prototype; add [JsInstanceSlot] sebastienros/jint#2581
• Shape TypedArray constructors; modernize element codecs with BinaryPrimitives by @​lahma in Shape TypedArray constructors; modernize element codecs with BinaryPrimitives sebastienros/jint#2582
• Trim per-iteration block ceremony; slot lane for lexical declaration initialization by @​lahma in Trim per-iteration block ceremony; slot lane for lexical declaration initialization sebastienros/jint#2583
• Serve nested-scope global reads and writes from the global-binding cache by @​lahma in Serve nested-scope global reads and writes from the global-binding cache sebastienros/jint#2584
• Probe own-property existence/enumerability without materializing descriptors by @​lahma in Probe own-property existence/enumerability without materializing descriptors sebastienros/jint#2585
• Keep builtin-shape deopt lazy: unmaterialized function slots stay deferred by @​lahma in Keep builtin-shape deopt lazy: unmaterialized function slots stay deferred sebastienros/jint#2588
• Serve arguments reads virtually; defer property materialization by @​lahma in Serve arguments reads virtually; defer property materialization sebastienros/jint#2589
• Reuse a fixed-slot per-iteration environment in for-of/for-in by @​lahma in Reuse a fixed-slot per-iteration environment in for-of/for-in sebastienros/jint#2586
• Bump the analyzers group with 3 updates by @​dependabot[bot] in Bump the analyzers group with 3 updates sebastienros/jint#2575
• BuiltinShape Factory slots: shape-path intrinsic references and throwers; flip Function.prototype by @​lahma in BuiltinShape Factory slots: shape-path intrinsic references and throwers; flip Function.prototype sebastienros/jint#2590
• Fix raw SetProperty on builtin-shaped hosts landing in an invisible dictionary by @​lahma in Fix raw SetProperty on builtin-shaped hosts landing in an invisible dictionary sebastienros/jint#2591
• Build the yield argument handler once, not per evaluation by @​lahma in Build the yield argument handler once, not per evaluation sebastienros/jint#2593
• Allocation-free for-in key enumeration by @​lahma in Allocation-free for-in key enumeration sebastienros/jint#2592
• Extend prepared-script engine-retention test to newer env cache shapes by @​lahma in Extend prepared-script engine-retention test to newer env cache shapes sebastienros/jint#2594
• Shape-backed object literals inside generator/async frames when values cannot suspend by @​lahma in Shape-backed object literals inside generator/async frames when values cannot suspend sebastienros/jint#2596
• Flip Intl, Temporal and %AsyncFromSyncIteratorPrototype% to builtin shapes by @​lahma in Flip Intl, Temporal and %AsyncFromSyncIteratorPrototype% to builtin shapes sebastienros/jint#2597
• GlobalObject joins the builtin-shape system via hybrid shape+overflow storage by @​lahma in GlobalObject joins the builtin-shape system via hybrid shape+overflow storage sebastienros/jint#2595
• Refresh engine comparison benchmark results by @​lahma in Refresh engine comparison benchmark results sebastienros/jint#2598
• Update Test262 suite to latest commit; drop issue-5066 slice exclusion by @​lahma in Update Test262 suite to latest commit; drop issue-5066 slice exclusion sebastienros/jint#2599
• Fix sticky+global [Symbol.match] .NET fast path returning wrong results by @​lahma in Fix sticky+global [Symbol.match] .NET fast path returning wrong results sebastienros/jint#2600
• Make raw SetProperty before lazy initialization survive Initialize by @​lahma in Make raw SetProperty before lazy initialization survive Initialize sebastienros/jint#2601
• Add unboxed slot-number lane to equality operators by @​lahma in Add unboxed slot-number lane to equality operators sebastienros/jint#2602
• Run expression-only for-loop bodies through a tight per-iteration cycle by @​lahma in Run expression-only for-loop bodies through a tight per-iteration cycle sebastienros/jint#2605
• Serve comparison-lane operands from the validated global-descriptor cache by @​lahma in Serve comparison-lane operands from the validated global-descriptor cache sebastienros/jint#2603
• Add dense-array append fast path for computed-index writes by @​lahma in Add dense-array append fast path for computed-index writes sebastienros/jint#2608
• Mark dead completion values at script/eval top level by @​lahma in Mark dead completion values at script/eval top level sebastienros/jint#2606
• Fused modulo-equality lane; admit const bindings to comparison-lane reads by @​lahma in Fused modulo-equality lane; admit const bindings to comparison-lane reads sebastienros/jint#2604
• Construct new Date() from clock ticks without intermediate conversions by @​lahma in Construct new Date() from clock ticks without intermediate conversions sebastienros/jint#2609
• Fix unlabeled break escaping a labeled switch statement by @​svenrog in Fix unlabeled break escaping a labeled switch statement sebastienros/jint#2607
• Flatten eligible loop-body lexicals into the pooled loop environment by @​lahma in Flatten eligible loop-body lexicals into the pooled loop environment sebastienros/jint#2610
• Evaluate sum-of-products assignments on raw doubles, boxing once by @​lahma in Evaluate sum-of-products assignments on raw doubles, boxing once sebastienros/jint#2611
• Refresh engine comparison benchmark results by @​lahma in Refresh engine comparison benchmark results sebastienros/jint#2612
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