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WalkthroughThe PR updates the default WebKit autobuild identifier and adds V8 stack trace tests for ChangesWebKit build target
WebAssembly stack trace tests
Suggested reviewers: Priority: ⬇️ Low Merge Risk: 🟡 Moderate · up to Replace the preview WebKit pin with the merged main-branch commit before merging this PR. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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In `@scripts/build/deps/webkit.ts`:
- Line 6: Replace the preview value in WEBKIT_VERSION with the merged commit SHA
from WebKit PR `#641` once that PR lands; do not retain the
autobuild-preview-pr-641-05a48085 tag or add a separate manual update for
generated process.versions.
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scripts/build/deps/webkit.tstest/js/node/v8/capture-stack-trace.test.js
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| * From https://github.com/oven-sh/WebKit releases. | ||
| */ | ||
| export const WEBKIT_VERSION = "cf1b36ec8703d8e87436094d21d478d358c7d886"; | ||
| export const WEBKIT_VERSION = "autobuild-preview-pr-641-05a48085"; |
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🔴 WEBKIT_VERSION is pinned to autobuild-preview-pr-641-05a48085, an ephemeral preview-PR release; merging this makes every fresh checkout's build depend on an artifact that is deleted once oven-sh/WebKit#641 closes, whereas the base pin is a permanent merged-commit SHA. Fix: before merge, repin to the merged commit's 40-hex SHA on oven-sh/WebKit main and confirm prebuilt tarballs exist for every platform×{debug,lto,asan,musl} flavor prebuiltSuffix() produces (per .claude/docs/landing-prs.md "Dependencies & vendoring": never merge a pin to preview tags or unmerged-PR builds).
Extended reasoning...
prebuiltUrl() in scripts/build/deps/webkit.ts:68-75 turns this value into https://github.com/oven-sh/WebKit/releases/download/autobuild-preview-pr-641-05a48085/bun-webkit-<os>-<arch><suffix>.tar.gz. Preview autobuild-preview-pr-* releases are transient CI artifacts for unmerged PRs; once WebKit#641 is merged or closed the release is removed and dep_fetch 404s, so bun bd fails from a clean cache on this commit (base branch pins a permanent autobuild-<sha> release that never disappears). The PR author states this is not mergeable as-is; landing-prs.md line 47 makes it a hard block. No other files reference the old SHA (grep clean), so only this line needs the repin.
Verification: normal — acknowledged in diff: the PR description states "This is a preview pin and must be repinned to a commit on the fork's main once #641 merges; it is not mergeable as is," and that claim holds against the code. The diff at /home/claude/bun/scripts/build/deps/webkit.ts:6 changes WEBKIT_VERSION from the permanent 40-hex merged-commit SHA "cf1b36ec8703d8e87436094d21d478d358c7d886"…
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Correct. The preview pin is there so that CI runs the new tests against oven-sh/WebKit#641, and this PR must not merge with it. I leave this thread open as the merge gate. When #641 lands I repin to the merge commit on the fork's main, check that its autobuild-<sha> release has a tarball for every platform and flavor, and resolve the thread.
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Status: draft. It waits for oven-sh/WebKit#641, and #641 waits for #42486: bun prints a wasm frame as Reproduction (bun 1.4.3, canary and // line 1
// line 2
function thrower() {
const tag = new WebAssembly.Tag({ parameters: [] });
return new WebAssembly.Exception(tag, [], { traceStack: true });
}
console.log(JSON.stringify(thrower().stack));Before:
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2 participants
Blocked on oven-sh/WebKit#641, which waits for #42486.
Problem
new WebAssembly.Exception(tag, [], { traceStack: true }).stackisthrower@/t.js:3:35\nmodule code@/t.js:5:35: JSC's own format, positions of the transpiled file, noError.prepareStackTrace. AnErroron the next line givesError\n at thrower (/t.js:5:10).WebAssemblyExceptionConstructor.cpp:102builds the string withInterpreter::stackTraceAsString, so bun's formatter hookVM::onComputeErrorInfoJSValuenever runs.Fix
Errorat that point and stores itsstack, so the value takes the path ofnew Error().stack.at unknown, where the old text hadcxx_thrower@wasm-function[1], so fix #640 #641 lands after Name WebAssembly frames in error.stack and the error printer #42486, which names wasm frames.Error.prepareStackTracereceives anError, V8 passes the exception. It runs inside the constructor, V8 runs it on first access. With no framesstackisundefined, no longer"".test/js/node/v8/capture-stack-trace.test.js(4 new tests, 50 pass). bun 1.4.3 fails 3 of the 4.Background
VM::onComputeErrorInfoJSValueis a bun addition to JSC.ErrorInstancecalls it on the first read ofstack. bun formats the frames V8-style there, applies source maps and callsError.prepareStackTrace.traceStackis an option of theWebAssembly.Exceptionconstructor. The spec leaves the text ofstackto the engine.Notes
traceStack). There is no user report.mainand a routine WebKit upgrade carries it, this PR drops theWEBKIT_VERSIONline and keeps the tests. By then Name WebAssembly frames in error.stack and the error printer #42486 is in, and I add a test for atraceStackexception that a JS import creates under a named wasm function: the wasm frame must have its name. Both PRs append tocapture-stack-trace.test.js, so this one needs a rebase then.autobuild-preview-pr-641-05a48085, the build of the first commit of fix #640 #641. The second commit of fix #640 #641 changes an include and a JSC test only.Error\n at thrower (/t.js:5:10)\n at Object.<anonymous> (/t.js:7:28)for the same script.Errorcreated on the same line (first column aside), it goes throughError.prepareStackTrace,Reflect.ownKeys(exception)stays[]with the getter on the prototype, and a spawned.tsfile with comment lines and a type alias above the function reports lines 6 and 8 of the source.at new MyExc), async frames (at async b), anode:vmcontext, 20000 constructions followed by a full GC, andBUN_JSC_validateExceptionChecks=1. A stack that crosses a wasm frame keeps its JS frames and their order.WEBKIT_VERSIONline.[policy-decision:webkit] gate passed · iteration 0 · 2 files touched
passes on PR (with fix)
diff hotspot
gate history · 1 passed · 0 rejected · iteration 0
evidence per changed file