Implement the reference types proposal #155
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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`
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This commit enables the
reference-typesandbulk-memory-operationsproposals 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, andElemDropare now all implemented instructions.Elementtype rather than beingembedded directly into a
Table. This is because they all need anindex to refer to in
ElemDropinstructions and such.FuncrefandNullrefvalue types have been addedref.funcandref.null