Coerce result of void functions to None & remove host_eval
#128
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rossberg
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Coerce result of void functions to None & remove `host_eval`
Connicpu
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May 11, 2020
rossberg
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ngzhian
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dhil
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This updates the explainer text according to the new spec we agreed in the 09-15-2020 CG meeting and discussions afterwards. The following are modifications and clarifications we made after the 09-15-2020 CG meeting, and the relevant issue posts, if any: https://github.com/WebAssembly/meetings/blob/master/main/2020/CG-09-15.md - `catch_br` wasm renamed to `delegate` (WebAssembly#133) - `rethrow` gains an immediate argument (WebAssembly#126) - Removed dependences on the reference types proposal and the multivalue proposal. The multivalue proposal was previously listed as dependent because 1. `try` is basically a `block`, so it can have multivalue input/output 2. `br_on_exn` can extract multiple values from a `block`. We don't have `br_on_exn` anymore, and I'm not sure 1 is a strong enough reason to make it a dependence. - Mention `rethrow` cannot rethrow exceptions caught by `unwind` (WebAssembly#142 and WebAssembly#137) - Mention some runtimes, especially web VMs, can attach stack traces to the exception object, implying stack traces are not required for all VMs - Update label/validation rules for `delegate` and `rethrow` (WebAssembly#146) - Finalize opcodes for `delegate` (0x18) and `catch_all` (0x19) (WebAssembly#145 and WebAssembly#147) I believe this resolves many previous issue threads, so I'll close them. Please reopen them if you think there are things left for discussions in those issues. Resolves WebAssembly#113, resolves WebAssembly#126, resolves WebAssembly#127, resolves WebAssembly#128, resolves WebAssembly#130, resolves WebAssembly#142, resolves WebAssembly#145, resolves WebAssembly#146, resolves WebAssembly#147.
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Fixes #122.
The
host_evalfunction breaks onceNoneresults are coerced, so I had to remove it for good. Only const nodes are still allowed as arguments to asserts (I also looked for ways to introduce a leaner assert syntax while at it, but the explicit type info from the const opcodes is still needed, so I left it as is for the time being).Also did a few stylistic clean-ups.