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Implement the reference types proposal #155

Merged
merged 4 commits into from Feb 5, 2020
Merged

Implement the reference types proposal #155

merged 4 commits into from Feb 5, 2020

Commits on Feb 5, 2020

  1. Implement the reference types proposal 

    This commit enables the `reference-types` and `bulk-memory-operations`
proposals from the upstream wasm spec test suite. This involved fully
implementing the reference types proposal, notably passive element
segments as well as a few table-related instructions. A summary of the
changes made here are:

* `TableCopy`, `TableInit`, and `ElemDrop` are now all implemented instructions.
* All element segments now live as an `Element` type rather than being
  embedded directly into a `Table`. This is because they all need an
  index to refer to in `ElemDrop` instructions and such.
* Type checking has been updated to handle subtyping
* The `Funcref` and `Nullref` value types have been added
* Tables now list their element type as a struct field
* Elements now participate in GC passes
* Global initializers are expanded with `ref.func` and `ref.null`
    @alexcrichton
    alexcrichton committed Feb 5, 2020
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  2. Run rustfmt

    @alexcrichton
    alexcrichton committed Feb 5, 2020
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  3. Checkout submodules on testing

    @alexcrichton
    alexcrichton committed Feb 5, 2020
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  4. Update test assertions

    @alexcrichton
    alexcrichton committed Feb 5, 2020
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