chicoxyzzy
JSC contributor
Summary
Works almost exclusively in JavaScriptCore's WebAssembly stack — BBQ and OMG compilation, IPInt entry thunks, Wasm GC object shapes, and the Wasm type representation — with occasional forays into B3/Air lowering and switch jump-table generation. Nothing here is classified as a security or hardening fix, but the pattern is compiler-correctness work on paths where miscompilation is memory-unsafe: forcing bounds checking for Memory64 in BBQ, zero-extending memory32 data segment offsets, overflow-safe jump-table range selection, and blocking dictionary/ArrayStorage transitions on Wasm GC objects. Systematic-variant candidate: the Memory64 and extended-const wrap-around fixes suggest integer-width handling across the Wasm tiers is still settling — sweep BBQ/OMG offset and index arithmetic for siblings, and check whether the Wasm GC object structure-transition guards cover every $vm and reflection entry point.
Components
Security Fix History
- No security fixes recorded
Hardening Commits
- No hardening commits recorded
Recent Commits
- 2026-08-05 [JSC][Wasm] Force BoundsChecking for Memory64 accesses in BBQ 2026-W31
- 2026-08-04 [JSC] Avoid $vm dictionary transitions on Wasm GC objects
- 2026-08-03 [JSC] Avoid ensureArrayStorage transition on Wasm GC objects
- 2026-08-03 [JSC] Fix NoUncountedMember in WasmConstExprGenerator
- 2026-08-02 [JSC][Wasm] Support WebAssembly.Exception options.traceStack
- 2026-08-02 [JSC][Wasm] Test Module.customSections returns independent ArrayBuffer copies
- 2026-08-02 [JSC][Wasm] Add regression test for i32 extended const wrap-around
- 2026-08-01 [JSC][Wasm] Speed up WebAssembly.Table construction
- 2026-07-31 [JSC][Wasm] Add DEFINE_IPINT_THUNK_FOR_ENTRY for IPInt entry
- 2026-07-29 [JSC][Wasm] Optimize BBQ br.table for consecutive same-target runs
- 2026-07-29 [JSC][Wasm] Exercise Memory64 bulk memory under OMG
- 2026-07-29 [JSC] Use overflow-safe range when choosing a switch jump table
- 2026-07-24 [JSC] Make releaseBBQCallee tolerate missing BBQ
- 2026-07-23 [JSC][Wasm] Fix OMG inlined stack origin lookup skipping deeper frames
- 2026-07-23 [JSC][Wasm] Shrink Type to a pointer-sized payload on 64-bit