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i31ref conflicts with JavaScript-numbers encoded as tagged 31bit values

6

Suppose a JavaScript number in 31bit int range flows into Wasm as an anyref type. Then in Wasm, we can perform a dynamic type-check to see if it has type...

tebbi

Should there be an "escape hatch" for vtable structural subtyping?

2

The "median" target for this proposal appears to be Java-like languages (though others can certainly be represented) which will heavily make use of vtable calls. In that light, it seems...

aardappel

Multiple Managed Memories

9

This is in the form of a suggestion; not an 'issue'. There is a potential conflict between multiple threads and managed memory. Especially, if that managed memory (MM) is to...

fgmccabe

Evaluating the cost of a GC addition to wasm

2

I generally feel the proposal is very elegant (in particular, being based on low level structs that are not assigned a particular semantics) and appears to be well positioned to...

aardappel

Clarify design constraints

2

This proposal (which I assume is 100% described [here](https://github.com/WebAssembly/gc/blob/master/proposals/gc/Overview.md)?) is a little challenging to understand because - It doesn't put the GC in context of the existing infrastructure (JS objects,...

qwertie

Include mention of possible varargs+ref calling convention?

1

In Scheme, Lua, Python, and so on, values and functions don't have types at compile time, and so the normal, general calling convention is just "Here are N values, have...

wingo

FAQ: Why not nominal typing?

1

I think I'm with you for using structural typing: it decreases coupling across modules. And I'm not a type guru so please forgive my ignorance here; but it would seem...

wingo

Working with wit component

2

I'm hoping to use wasm-gc with [wit-component](https://github.com/WebAssembly/component-model), and since neither project is finally stable, I wanted to do some preliminary discussions. When enabling the gc type, a gc related option...

oovm

[js-api] add tests for global imports with GC types

3

This PR adds tests for the update to the JS API made in https://github.com/WebAssembly/gc/pull/467 to enable global imports of various reftype values. These tests pass in V8 and there's a...

takikawa

Dynamically initializing a non mutable array

4

Hi, I'm probably missing the obvious but I can't seem to find a way to dynamically populate a non mutable array: - there is no array.new_xxx for initializing a new...

ericvergnaud