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1. Commits on Sep 27, 2026

   • [JSC] Rename the conservative scan's "current thread" to the conductor, since the scan can run on a helper thread

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     dhecht

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   • [JSC] Remove SlotVisitor's Heap in preparation for a visitor that marks more than one heap

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2. Commits on Sep 25, 2026

   • [JSC] Prepare visitChildren and marking constraints for a SlotVisitor that marks more than one heap

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     dhecht

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   • [JSC] Move the Collector implementation out of Heap.cpp

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     dhecht

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3. Commits on Sep 24, 2026

   • [JSC] Split the GC's collection-cycle state and machinery into a Collector class

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4. Commits on Sep 22, 2026

   • Make CString::newUninitialized() reachable only through CStringWithEncoding

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     cdumez

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5. Commits on Sep 21, 2026

   • Unreviewed build fix after 321483@main

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     cdumez

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   • Type the JSC heap names as ASCIICString and the profiler marker messages as UTF8CString

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     cdumez

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6. Commits on Sep 20, 2026

   • [JSC] Prefetch MarkedBlock when found for allocation

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     kmiller68

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7. Commits on Sep 18, 2026

   • finalizeWasmCalleeCleanup should run a cross-modifying code fence

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8. Commits on Sep 17, 2026

   • [JSC] Redesign WeakBlock

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     Constellation

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9. Commits on Sep 16, 2026

   • Reduce use of CString::legacyCStringPointer() in assertion and signpost macros

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     cdumez

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   • Add note to ConstraintConcurrency

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     kmiller68

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10. Commits on Sep 14, 2026

    • [JSC] Unify JS Allocators

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      Constellation

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11. Commits on Sep 12, 2026

    • Rename toCString() to toUTF8CString() and stop PrintStream from printing an untyped CString

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      cdumez

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12. Commits on Sep 11, 2026

    • [JSC] Rewrite WeakGCMap like JS WeakMap

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      Constellation

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    • [JSC] Move WarmUp thread to libpas

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      Constellation

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13. Commits on Sep 10, 2026

    • [JSC] Fill Wasm GC arrays of references with gcSafeMemfill

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    • Add CString::legacyCStringPointer() and adopt it at every utf8().data() call site

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      cdumez

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    • Unreviewed, reverting 320655@main (fe81aba19836)

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      Constellation

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    • Unreviewed, reverting 320674@main (03c6c9504495)

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14. Commits on Sep 9, 2026

    • Replace sched_yield with nanosleep and abstract away spin lock logic on all platforms

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15. Commits on Sep 8, 2026

    • [JSC] Remove Heap::isPagedOut

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      Constellation

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    • [JSC] Move BlockDirectory for-stealing list to AlignedMemoryAllocator

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      Constellation

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    • [JSC] Unify allocators

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    • Add missing thread-safety annotations and address potential issues they uncovered

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      cdumez

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16. Commits on Sep 5, 2026

    • [JSC] m_numberOfWaitingParallelMarkers may be unbalanced

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      Constellation

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17. Commits on Sep 2, 2026

    • [JSC] Make DateInstance non-destructible

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      Constellation

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    • [JSC] Baseline JIT should not construct `GCOwnedDataScope` on the compiler thread

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      sosukesuzuki

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18. Commits on Aug 30, 2026

    • [JSC] Introduce JSC WarmUpThread for MarkedBlocks

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      Constellation

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19. Commits on Aug 27, 2026

    • [JSC] Make MarkedSpace::stopAllocating faster

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      Constellation

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    • JSDOMException is not reconciling it's weak stack trace

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      kmiller68

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20. Commits on Aug 26, 2026

    • [JSC] Do not broadcast termination from the thread that is about to stop draining

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      Constellation

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    • REGRESSION(319727@main): Broke the build with clang 20 due to a self-referential ScopedLambda constraint

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21. Commits on Aug 25, 2026

    • [JSC] Optimize MarkedBlock::Handle::stopAllocating

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