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# JavaScriptCore Upstream Changes: 1b6f54d1c872..upstream/main **Date range**: Feb 5 -- Feb 11, 2026 **Total JSC commits**: 38 --- ## 1. New Features ### WebAssembly JSPI (JavaScript Promise Integration) **Commit**: `53e97afd3421` -- [JSC] JSPI Implementation **Files changed**: 59 files, +3879/-148 lines Full implementation of the [WebAssembly JSPI proposal](https://github.com/WebAssembly/js-promise-integration). Adds two new APIs: - `WebAssembly.promising(wasmFun)` -- wraps a wasm function so it returns a Promise - `new WebAssembly.Suspending(jsFun)` -- wraps a JS function so wasm can suspend on its result Controlled by `useJSPI` feature flag (disabled by default). This is a large change that introduces: - New classes: `EvacuatedStack`, `PinballCompletion`, `JSPIContext`, `WebAssemblySuspending`, `WebAssemblyPromising`, `JSWebAssemblySuspendError` - New `JSPIContext` struct added to `VM` (field `topJSPIContext`) - New `pinballCompletionStructure` in VM - New `WebAssemblySuspendError` and `WebAssemblySuspending` lazy class structures in JSGlobalObject - New methods on VM: `addEvacuatedStackSlice`, `removeEvacuatedStackSlice`, `gatherEvacuatedStackRoots` - New iso subspace: `pinballCompletionSpace` **Follow-up**: `f67441012b90` -- JSPI cages should only generate JIT code when JITCage is enabled ### WebAssembly Memory64 in BBQ Tier **Commit**: `7b98e4b17594` -- Add support for Memory64 in BBQ Tier Extends Memory64 support from the interpreter to the BBQ JIT tier, allowing wasm modules to address >4GB of memory. ### WebAssembly Multi-Memory (instantiation only) **Commit**: `bdf26416947e` -- Support instantiating multiple wasm memories Adds support for instantiating multiple memories in wasm modules (but not executing instructions that use memories other than index 0). Gated behind `useWasmMultiMemory` flag. ### LOL (Lightweight Optimizing Language) JIT -- New Tier (In Progress) A new JIT compilation tier "LOL" is being built incrementally across multiple commits: - `dd56e0f5b991` -- Add get_argument/argument_count bytecodes - `fb43184a0a77` -- Add to_primitive-like bytecodes - `f52fa4a30c76` -- Add switch/throw bytecodes - `7fd04c82d291` -- Add support for this/prototype bytecodes - `11127b8a61e0` -- Add support for op_ret These commits add new files under `Source/JavaScriptCore/lol/` (LOLJIT.cpp, LOLJIT.h, LOLRegisterAllocator.h). This appears to be a new lightweight JIT tier between Baseline and DFG. --- ## 2. Performance Improvements ### Deep Rope String Slicing -- 168x faster **Commit**: `93f2fd68619b` -- [JSC] Limit rope traversal depth in `tryJSSubstringImpl` Limits rope traversal depth to 16 in `tryJSSubstringImpl`. Deep rope strings from repeated concatenation (`s += 'A'`) previously caused O(n^2) behavior. When the depth limit is exceeded, it falls back to `resolveRope` to flatten the string. This directly addresses a performance issue reported against Bun where it was significantly slower than Node.js. ### String#endsWith DFG/FTL Optimization -- up to 10.5x faster **Commit**: `901865149859` -- [JSC] Optimize `String#endsWith` in DFG/FTL Adds a new DFG/FTL intrinsic `StringPrototypeEndsWithIntrinsic` for `String.prototype.endsWith`. Constant folding case is 10.5x faster; general case is 1.45x faster. ### RegExp Flag Getters in DFG/FTL and IC -- 1.6x faster **Commit**: `1fe86a244d00` -- [JSC] Handle RegExp flag getters in DFG/FTL and IC Adds DFG/FTL and inline cache support for RegExp flag property getters (`.global`, `.ignoreCase`, `.multiline`, `.dotAll`, `.sticky`, `.unicode`, `.unicodeSets`, `.hasIndices`). ### String#@@iterator as NewInternalFieldObject in DFG/FTL **Commit**: `44cba41d8eef` -- [JSC] Handle `String#@@iterator` as `NewInternalFieldObject` in DFG/FTL Optimizes string iterator creation in DFG/FTL by treating it as a `NewInternalFieldObject`, enabling allocation sinking. ### ArithMod(Int52) in DFG/FTL **Commit**: `49a21e7ff327` -- [JSC] Add ArithMod(Int52Use, Int52Use) in DFG / FTL **Follow-ups**: `f96be6066671` (constant folding fix), `c8f283248f3f` (NaNOrInfinity fix) Adds Int52 modulo support in DFG/FTL, avoiding expensive `fmod` double operations when inputs are integer-like doubles. ### ArithDiv(Int52) in DFG/FTL -- REVERTED **Commit**: `582cb0306b7c` -- [JSC] Add ArithDiv(Int52Use, Int52Use) in DFG / FTL **Revert**: `2e967edd1dc0` -- Reverted due to JetStream3 regressions ### Intl formatToParts Pre-built Structure -- up to 1.15x faster **Commit**: `a5dd9753d23c` -- [JSC] Optimize Intl formatToParts methods with pre-built Structure Optimizes Intl's `formatToParts` methods by using pre-built Structures for the returned part objects. ### JSBigInt Inline Storage **Commit**: `dbc50284d4cf` -- [JSC] Inline storage into JSBigInt **Related**: `304cf0713b9d` -- Remove JSBigInt::rightTrim and JSBigInt::tryRightTrim Major structural change to JSBigInt: digits are now stored inline (trailing storage) instead of via a separate `CagedBarrierPtr`. This eliminates the separate allocation and pointer indirection. `tryRightTrim` and `rightTrim` removed; `createFrom` renamed to `tryCreateFrom` with span-based API. ### WYHash Always Enabled for Strings **Commit**: `14ba1421ca08` -- [JSC] Always use WYHash for strings Previously, WYHash had a threshold (disabled for short strings on weak devices). Now it's enabled regardless of string size. ### JIT Worklist Thread Count: 3 -> 4 **Commit**: `453c578cadf6` -- [JSC] Bump JIT worklist thread number from 3 to 4 ### Greedy Register Allocator Improvements **Commit**: `b642ae17aade` -- [JSC] Proactively coalesce spill slots during register allocation **Commit**: `a78705db7c08` -- [JSC] GreedyRegAlloc: amortize cost of clearing the visited set in the evict loop --- ## 3. Bug Fixes ### RegExp (YARR) Fixes - `dea6808af40e` -- **Fix stale captures in FixedCount groups in MatchOnly mode**: `.test()` was not clearing captures between FixedCount iterations, causing stale values visible to backreferences. - `437e137889ea` -- **Fix infinite loop in JIT for non-greedy backreference to zero-width capture**: A non-greedy backreference like `\1*?` could loop forever when the referenced capture was undefined or empty. - `d4f884d21c0e` -- **Fix backtracking in NestedAlternativeEnd**: Wrong jump target was used when backtracking from NestedAlternativeEnd. ### ARM64 Cached Immediate Fix **Commit**: `8396ad321ad0` -- [JSC] Fix edge case issue of cached imm in ARM64 TrustedImm32(-1) was not zero-extended when cached, causing wrong reuse when followed by TrustedImm64(-1). ### Wasm Fixes - `cea8513d43ef` -- **Fix RefCast/RefTest folding in B3**: The condition was inverted, causing wrong cast results. - `629632da96e1` -- **Fix debugger races with idle and active VMs in stop-the-world** - `e5391ad90f47` -- **Stack check on IPInt->BBQ loop OSR entry** - `fd15e0d70ab1` -- **Use FrameTracer in wasm table_init operations** ### Structure Heap Alignment Assert Fix **Commit**: `47b52526fd42` -- [JSC] Fix startOfStructureHeap alignment RELEASE_ASSERT --- ## 4. Bun-side Changes - Updated `WEBKIT_VERSION` to `f03492d0636f` - Updated `SerializedScriptValue.cpp`: replaced removed `JSBigInt::tryRightTrim` with `JSBigInt::tryCreateFrom` span-based API - Fixed `CloneSerializer`/`CloneDeserializer` inheritance (`private` -> `public CloneBase`) - Explicitly disabled `ENABLE_MEDIA_SOURCE`, `ENABLE_MEDIA_STREAM`, `ENABLE_WEB_RTC` in `build.ts` and `SetupWebKit.cmake` for JSCOnly port --- ## 5. Summary by Component | Component | Commits | Key Changes | |-----------|---------|-------------| | **WASM** | 9 | JSPI implementation, Memory64 BBQ, multi-memory, RefCast fix, stack checks, debugger races | | **DFG/FTL** | 6 | String#endsWith opt, RegExp flags opt, String@@iterator opt, ArithMod(Int52) | | **YARR (RegExp)** | 3 | Stale captures fix, infinite loop fix, NestedAlternativeEnd backtracking fix | | **B3/Air** | 3 | Spill slot coalescing, generational set for eviction, RefCast/RefTest fix | | **LOL JIT** | 5 | New JIT tier being built incrementally | | **Runtime** | 6 | BigInt inline storage, WYHash always-on, Intl formatToParts opt, ARM64 imm fix, rope depth limit | --------- Co-authored-by: Sosuke Suzuki <sosuke@bun.com>
132 lines
3.7 KiB
JSON
132 lines
3.7 KiB
JSON
{
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"name": "test",
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"devDependencies": {
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"@types/react": "18.0.28",
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"@types/react-dom": "18.0.11",
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"@types/supertest": "2.0.12",
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"@types/utf-8-validate": "5.0.0",
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"@types/ws": "8.5.10",
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"@types/puppeteer": "7.0.4"
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},
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"dependencies": {
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"@astrojs/node": "9.1.3",
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"@azure/service-bus": "7.9.4",
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"@bufbuild/protobuf": "2.10.2",
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"@connectrpc/connect": "2.1.1",
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"@connectrpc/connect-node": "2.0.0",
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"@electric-sql/pglite": "0.3.15",
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"@fastify/websocket": "11.0.2",
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"@grpc/grpc-js": "1.12.0",
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"@grpc/proto-loader": "0.7.10",
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"@happy-dom/global-registrator": "17.0.3",
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"@napi-rs/canvas": "0.1.91",
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"@nestjs/common": "11.0.3",
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"@nestjs/core": "11.0.3",
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"@prisma/client": "5.8.0",
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"@remix-run/node": "2.16.8",
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"@remix-run/react": "2.10.3",
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"@remix-run/serve": "2.10.3",
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"@resvg/resvg-js": "2.4.1",
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"@swc/core": "1.3.38",
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"@testing-library/jest-dom": "6.6.3",
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"@testing-library/react": "16.1.0",
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"@verdaccio/config": "6.0.0-6-next.76",
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"acorn": "8.15.0",
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"ansi-regex": "6.1.0",
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"astro": "5.5.5",
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"aws-cdk-lib": "2.148.0",
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"axios": "1.6.8",
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"body-parser": "1.20.2",
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"bun-plugin-svelte": "file:../packages/bun-plugin-svelte",
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"bun-plugin-yaml": "0.0.1",
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"comlink": "4.4.1",
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"commander": "12.1.0",
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"detect-libc": "2.0.3",
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"devalue": "5.1.1",
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"es-module-lexer": "1.3.0",
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"esbuild": "0.18.6",
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"express": "4.18.2",
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"fast-glob": "3.3.1",
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"fastify": "5.2.2",
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"filenamify": "6.0.0",
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"happy-dom": "17.0.3",
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"hono": "4.7.2",
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"http2-wrapper": "2.2.1",
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"https-proxy-agent": "7.0.6",
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"iconv-lite": "0.6.3",
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"immutable": "5.1.3",
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"isbot": "5.1.13",
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"jest-extended": "4.0.0",
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"jimp": "1.6.0",
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"jsdom": "25.0.1",
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"jsonwebtoken": "9.0.2",
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"jws": "4.0.0",
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"lodash": "4.17.21",
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"mongodb": "6.0.0",
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"msw": "2.3.0",
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"mysql2": "3.7.0",
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"node-gyp": "10.0.1",
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"nodemailer": "6.9.3",
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"p-queue": "8.1.0",
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"peechy": "0.4.310",
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"pg": "8.11.1",
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"pg-connection-string": "2.6.1",
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"pg-gateway": "0.3.0-beta.4",
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"pino": "9.4.0",
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"pino-pretty": "11.2.2",
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"postgres": "3.3.5",
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"prisma": "5.1.1",
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"prompts": "2.4.2",
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"proxy": "2.2.0",
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"react": "file:../node_modules/react",
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"react-dom": "18.3.1",
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"reflect-metadata": "0.2.2",
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"rollup": "4.4.1",
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"sass": "1.79.4",
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"sharp": "0.34.5",
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"sinon": "6.0.0",
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"socket.io": "4.7.1",
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"socket.io-adapter": "2.5.5",
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"socket.io-client": "4.7.1",
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"solc": "0.8.28",
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"source-map": "0.7.4",
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"st": "3.0.0",
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"string-width": "7.0.0",
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"strip-ansi": "7.1.0",
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"stripe": "15.4.0",
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"superagent": "10.2.2",
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"supertest": "6.3.3",
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"svelte": "5.20.4",
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"tsyringe": "4.8.0",
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"type-graphql": "2.0.0-rc.2",
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"typeorm": "0.3.20",
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"typescript": "5.9.2",
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"undici": "5.20.0",
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"unzipper": "0.12.3",
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"uuid": "11.1.0",
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"v8-heapsnapshot": "1.3.1",
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"verdaccio": "6.0.0",
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"vitest": "0.32.2",
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"webpack": "5.88.0",
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"webpack-cli": "4.7.2",
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"ws": "8.18.3",
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"xml2js": "0.6.2",
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"yargs": "17.7.2"
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},
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"private": true,
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"scripts": {
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"typecheck": "tsc --noEmit",
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"bd:v": "(bun run --silent --cwd=../ build:debug &> /tmp/bun.debug.build.log || (cat /tmp/bun.debug.build.log && rm -rf /tmp/bun.debug.build.log && exit 1)) && rm -f /tmp/bun.debug.build.log && ../build/debug/bun-debug",
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"bd": "BUN_DEBUG_QUIET_LOGS=1 bun --silent bd:v"
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},
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"optionalDependencies": {
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"duckdb": "1.3.1",
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"@duckdb/node-api": "1.1.3-alpha.7",
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"msgpackr-extract": "3.0.2"
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},
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"resolutions": {
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"react": "../node_modules/react",
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"@types/node": "25.0.0"
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}
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}
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