robobun
b2e5c6c7d1
Upgrade WebKit to ea1bfb85d259 ( #26161 )
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## Summary
- Upgrades WebKit from `c4d4cae03ece` to `ea1bfb85d259`
- Merges upstream WebKit changes into oven-sh/webkit fork
## WebKit Upgrade Summary (JavaScriptCore Changes)
### JSType Enum Changes
**No breaking changes to JSType enum from upstream.** The diff showing
`InternalFieldTupleType` removal is actually showing Bun's custom
addition - upstream WebKit does not have this type. The Bun fork
maintains `InternalFieldTupleType` after `DerivedStringObjectType`,
which is preserved during the upgrade.
### Notable Performance Improvements
#### ARM64 Conditional Compare Chain (ccmp/ccmn)
- **Commit:** `2cd6a734ed6c`
- Implements ARM64 `ccmp`/`ccmn` instruction chaining for compound
boolean expressions
- Converts patterns like `if (x0 == 0 && x1 == 1)` into efficient
conditional compare sequences
- Reduces branch prediction misses and code size
- Introduces new Air opcodes: `CompareOnFlags`,
`CompareConditionallyOnFlags`, `BranchOnFlags`
#### Extended Constant Materialization for Float16/Float/Double/V128
- **Commit:** `0521cc7f331a`
- Enhanced ARM64 constant materialization using `movi`, `mvni`, and
vector `fmov`
- Avoids memory loads for Float constants (32-bit values can now be
materialized directly)
- Adds `FPImm128` and `Move128ToVector` Air instructions
#### DFG/FTL Storage Pointer Improvements
- **Commits:** `00c0add58ec3`, `7051d3ac1f34`
- FTL Phis now properly support storage (butterfly) pointers
- Introduces `KnownStorageUse` for all storage operands in DFG/FTL
- Fixes issues with Array allocation sinking when creating storage Phis
- Improves GC safety by ensuring butterfly pointers are properly tracked
### Bug Fixes
#### Thread Termination Race Condition
- **Commit:** `23922a766f07`
- Fixes race condition in `VM::m_hasTerminationRequest` between main
thread and worker threads
- Moves `setHasTerminationRequest()` call into `VMTraps::handleTraps()`
to eliminate race
#### ThrowScope Exception Clearing
- **Commit:** `67abaaa35c4d`
- ThrowScopes can no longer accidentally clear termination exceptions
- Introduces `tryClearException()` which fails on termination exceptions
- Affects iterator operations, promises, and WebCore stream handling
#### Bytecode Cache JIT Threshold
- **Commit:** `e0644034f46e`
- Functions loaded from bytecode cache now correctly set JIT threshold
- Previously, cached functions would JIT immediately on first execution
#### Wasm Fixes
- **Commit:** `8579516f4b61` - Fix JIT-less Wasm-to-JS i31ref
marshalling for i31 values in double format
- **Commit:** `22b6a610f6ff` - Fix nullability for wasm js-string
builtins return types (`cast`, `fromCharCode`, `fromCodePoint`,
`concat`, `substring`)
- **Commit:** `5ad2efd177db` - Optimize Wasm BlockSignature to avoid
lock contention during parsing
#### 32-bit ARM (Armv7) Fix
- **Commit:** `9cc23c0e75b7`
- Fixes tail call shuffler register allocation on 32-bit ARM
- Prevents assertion failures when JSValue can load via FPR but GPRs are
exhausted
### New Features
#### Temporal PlainYearMonth Support
- **Commit:** `d865004780e6`
- Enables all PlainYearMonth test262 tests
- Fixes several bugs in month code handling and rounding modes
#### Wasm IPInt Execution Tracing
- **Commit:** `634156af4114`
- Adds `--traceWasmIPIntExecution` option for debugging WebAssembly
interpreter execution
### Code Quality Improvements
- **Commit:** `31bc5e6778d4` - `JSRegExpStringIterator` reduced from 56
to 40 bytes by merging boolean fields into bitfield
- **Commit:** `cda948675446` - Fix fragile include dependency in
`JSC::getCallDataInline`
- **Commit:** `bd87f5db107e` - Fix unretained local variable warnings in
JavaScriptCore/API
## Merge Conflicts Resolved
Fixed 4 merge conflicts related to Bun-specific patches:
1. `Source/JavaScriptCore/API/JSVirtualMachine.mm` - Removed
JSLockHolder as per Bun's patch
2. `Source/JavaScriptCore/runtime/JSBoundFunction.h` - Used relative
includes instead of framework includes
3. `Source/JavaScriptCore/runtime/JSObjectInlines.h` - Used relative
includes and updated `JSFunction.h` to `JSFunctionInlines.h`
4. `Source/WTF/wtf/text/WTFString.h` - Preserved ExternalStringImpl
support
## Test plan
- [x] WebKit builds successfully (`bun build.ts debug`)
- [x] JSType enum values verified to be compatible
- [ ] CI builds and tests pass
🤖 Generated with [Claude Code](https://claude.com/claude-code )
---------
Co-authored-by: Claude Bot <claude-bot@bun.sh >
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com >
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: Jarred Sumner <jarred@jarredsumner.com >
Co-authored-by: vadim-anthropic <vadim@anthropic.com >
Co-authored-by: Dylan Conway <dylan.conway567@gmail.com >
2026-01-16 18:46:48 -08:00
