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note: WASM kernel uses deprecated 'try' instruction + sync XHR (follow-up)

Real browser console on blog.rose-ash.com shows the WASM kernel (Jun-29 artifact, built
with an older wasm_of_ocaml) emits the legacy 'try' exception instruction (deprecated; use
try_table) + loadManifest does a sync XHR. Not breaking yet (SPA boots; the day's symptom
was a stale cached loader, cleared by hard refresh) but will break when browsers drop 'try'.
Fix = rebuild the kernel with the current 6.3.2 toolchain (may emit try_table) + verify in a
real browser + make loadManifest async. hosts/ocaml/browser toolchain; schedule when the box
is quiet with a rollback path, don't rush.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2026-06-30 15:38:47 +00:00

2.5 KiB

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Follow-up: WASM kernel uses deprecated `try` exception instruction (+ sync XHR)

Found: 2026-06-30, from a real browser console on blog.rose-ash.com (modern Chrome/Firefox). Severity: not yet breaking — deprecation warnings. The SPA still boots (a hard refresh cleared a stale cached loader, which was the day's actual symptom). But when browsers remove the legacy try instruction, the WASM kernel will fail to instantiate → "SxKernel not found after 5s" → no SPA (server-rendered pages + native-form writes still work; only SPA nav + the interactive picker need the kernel).

The two warnings

WebAssembly exception handling 'try' instruction is deprecated … use 'try_table' instead (×6). The kernel shared/static/wasm/sx_browser.bc.wasm.assets/*.wasm was compiled (Jun-29 artifact) with the legacy exception-handling encoding. wasm_of_ocaml standardized on try_table; current toolchain is 6.3.2.
Synchronous XMLHttpRequest on the main thread is deprecated — sx-platform.js:575, loadManifest() does xhr.open("GET", …module-manifest.sx…, false) (sync). Browsers increasingly restrict sync XHR.

Fix

Rebuild the kernel with the current toolchain. bash hosts/ocaml/browser/build-all.sh (dune builds browser/sx_browser.bc.wasm.js), then bundle.sh syncs to shared/static/wasm/. Modern wasm_of_ocaml 6.x may emit try_table by default → a fresh rebuild alone could fix #1. Verify: disassemble a .wasm unit (wasm-tools print / grep for try_table vs try), then boot it in a REAL up-to-date browser (not just the older Playwright chromium, which still accepts try) and confirm no deprecation warning + SxKernel registers. If 6.3.2 still emits legacy try, check for a wasm_of_ocaml flag or bump the compiler.
loadManifest → async. Change to an async fetch and restructure the boot so the manifest is awaited before module loading (it's currently consumed synchronously). Contained to hosts/ocaml/browser/sx-platform.js + its copy in shared/static/wasm/.

Scope / ownership

hosts/ocaml/browser/ is the OCaml→WASM toolchain — generally out of the host loop's lane, though the host loop has committed there for the blog SPA (b21ae05e, 689dae7d). A kernel rebuild affects the LIVE SPA, so do it when the box is quiet, with real-browser verification, and a quick rollback path (the Jun-29 .assets are the known-good artifact — keep a copy before overwriting). Not urgent; schedule rather than rush.

2.5 KiB Raw Blame History Unescape Escape

Follow-up: WASM kernel uses deprecated try exception instruction (+ sync XHR)

The two warnings

Fix

Scope / ownership

2.5 KiB

Raw Blame History

Follow-up: WASM kernel uses deprecated `try` exception instruction (+ sync XHR)