[js-api] Update wasm-module-builder.js for exnref

WebAssembly / exception-handling

Proposal to add exception handling to WebAssembly

https://webassembly.github.io/exception-handling/

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[js-api] Update wasm-module-builder.js for exnref #313

Closed aheejin closed 5 months ago

aheejin commented 5 months ago

This pulls in some exnref-related changes from https://github.com/v8/v8/blob/main/test/mjsunit/wasm/wasm-module-builder.js but does not sync with it completely. That v8 version contains a lot of features from new proposals that are not really relevant to EH and exnref, so this pulls only the relevant EH parts in.

This also renames kWasmStmt to kWasmVoid as in the V8 version, because it looks more intuitive. Also renames kTagAttribute to kExceptionAttribute.

aheejin commented 5 months ago

Sorry, will reopen this PR in the upstream branch (to make stacked PRs) Reopened as #314.