JSC: async-context propagation for Bun's span context (one slot per suspended generator, PromiseReactionJobWithAsyncContext, AsyncFromSync reject paths) by Jarred-Sumner · Pull Request #482 · oven-sh/WebKit

Add BunTelemetrySpanType and @isTelemetrySpan; async-context capture in generators; leave-frame hook

Jarred-Sumner

committed

a77f8da

DFG: give SpeculateInt32Operand/SpeculateBooleanOperand move constructors (CallDOM with Int32/Boolean args double-unlocked)

Jarred-Sumner

committed

12f5991

Add JSTracedFunction: a JSFunction that runs embedder enter/leave hooks around a direct call

Jarred-Sumner

committed

67b6b5b

JSTracedFunction review pass: named frame state instead of a bare CallSiteIndex value, unwind list invariants asserted, Bun enum values appended, embedder cell type named generically

Jarred-Sumner

committed

a603e60

Address review: entry async context is snapshotted by the wrapper bytecode (not stored on the generator, so for-await in the sync prefix and DFG allocation sinking cannot disturb it); AsyncFromSync…

Jarred-Sumner

committed

c0ad48a

Address review: distinct host function for the thunk-backed executable (hostFunctionStub keys on the pointer); thunk type-checks Wrap targets and keeps the checked target in a frame local instead o…

Jarred-Sumner

committed

66674a1

Guard the remaining Bun-only includes/declaration

Jarred-Sumner

committed

e24dc89

AsyncContextSwapScope: read cell->type() once

Jarred-Sumner

committed

c476b88

JSTracedFunction: use the JIT thunk on Windows too

dylan-conway

authored and

Jarred-Sumner

committed

b41cd51

Review: guard the generators' AsyncContext field and remaining Bun-only includes; PromiseReactionJobWithAsyncContext keyed on the reaction's tag; name the enter hook's 'traced' state

Jarred-Sumner

committed

7cd47f2

JSMicrotask.cpp: drop the redundant inner guard around an include already inside the Bun block

Jarred-Sumner

committed

3c237b4

Drop JSTracedFunction, the embedder InternalFieldObject type/intrinsic, the leave-async-frame hook and the DFG operand fix: Bun now uses plain host functions and its own JSType; what remains is the…

Jarred-Sumner

committed

b936c92

JSPromise.cpp: drop two no-op leftovers from the revert

Jarred-Sumner

committed

f2f1a47

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JSC: async-context propagation for Bun's span context (one slot per suspended generator, PromiseReactionJobWithAsyncContext, AsyncFromSync reject paths) - #482

JSC: async-context propagation for Bun's span context (one slot per suspended generator, PromiseReactionJobWithAsyncContext, AsyncFromSync reject paths)#482
Jarred-Sumner wants to merge 13 commits into
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claude/otel-async-context

Commits on Aug 26, 2026

Add BunTelemetrySpanType and @isTelemetrySpan; async-context capture in generators; leave-frame hook

DFG: give SpeculateInt32Operand/SpeculateBooleanOperand move constructors (CallDOM with Int32/Boolean args double-unlocked)

Add JSTracedFunction: a JSFunction that runs embedder enter/leave hooks around a direct call

JSTracedFunction review pass: named frame state instead of a bare CallSiteIndex value, unwind list invariants asserted, Bun enum values appended, embedder cell type named generically

Address review: entry async context is snapshotted by the wrapper bytecode (not stored on the generator, so for-await in the sync prefix and DFG allocation sinking cannot disturb it); AsyncFromSync…

Address review: distinct host function for the thunk-backed executable (hostFunctionStub keys on the pointer); thunk type-checks Wrap targets and keeps the checked target in a frame local instead o…

Guard the remaining Bun-only includes/declaration

AsyncContextSwapScope: read cell->type() once

JSTracedFunction: use the JIT thunk on Windows too

Review: guard the generators' AsyncContext field and remaining Bun-only includes; PromiseReactionJobWithAsyncContext keyed on the reaction's tag; name the enter hook's 'traced' state

JSMicrotask.cpp: drop the redundant inner guard around an include already inside the Bun block

Drop JSTracedFunction, the embedder InternalFieldObject type/intrinsic, the leave-async-frame hook and the DFG operand fix: Bun now uses plain host functions and its own JSType; what remains is the…

JSPromise.cpp: drop two no-op leftovers from the revert