WebAssembly Exception Handling

Category: WebAssembly
Type: New or changed feature
Status: Enabled by default (Chrome 95)
Intent stage: Prepare to ship

Summary

This feature is adding exception support to WebAssembly. Exception handling allows code to break control flow when an exception is thrown. The exception can be any exception known by the WebAssembly module, or it may be an unknown exception that was thrown by a called imported function.

Standards & signals

Specification: https://github.com/WebAssembly/exception-handling
Firefox: Positive
Safari: Positive
Web developers: Positive — This feature is one of the last bits missing to port legacy c++ apps to the web
Tracking bug: https://bugs.chromium.org/p/v8/issues/detail?id=8091

Docs: https://github.com/WebAssembly/exception-handling/blob/master/proposals/Exceptions.md

Explainers: https://github.com/aheejin/exception-handling

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