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by davexunit
273 days ago
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Scheme doesn't have restarts as a core concept like Common Lisp, but it does have continuations. For the Scheme implementation I worked on [0], the exception system is built on top of the continuation system. In other words, Scheme exceptions are not Wasm exceptions. However, we did find a use for Wasm exceptions in the implementation of the runtime. We realized it would be useful to mark the entry point into Scheme with a Wasm 'try' block for re-entrancy reasons. Programs might call from Scheme to JS back to Scheme and on and on. When we suspend the current continuation we throw a Wasm exception and find the correct entry point for doing our stack tomfoolery, re-throwing until we find it. I don't know if my explanation makes any sense but that's how we're using Wasm exceptions. [0] https://spritely.institute/hoot/ |
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