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Empty, passive element segments were always emitted as having `func` type
because all their elements trivially were RefFunc (because they have no
elements) and because we were incorrectly checking table types if they existed
instead of the element segment's type directly to see if it was non-func.
Fix the bug by checking each element segment's type directly and add a test.
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Basic reference types like `Type::funcref`, `Type::anyref`, etc. made it easy to
accidentally forget to handle reference types with the same basic HeapTypes but
the opposite nullability. In principle there is nothing special about the types
with shorthands except in the binary and text formats. Removing these shorthands
from the internal type representation by removing all basic reference types
makes some code more complicated locally, but simplifies code globally and
encourages properly handling both nullable and non-nullable reference types.
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Before this, the element segments would be printed as having type
funcref, and then if their table had a specialized type, the element
type would not be a subtype of the table and validation would fail.
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This PR adds support for `ref.null t` as a valid element segment
item. The abbreviated format of `(elem ... func $f $g...)` is kept in
both printing and binary emitting if all items are `ref.func`s. Public
APIs aren't updated in this PR.
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Passive element segments do not belong to any table, so the link between
Table and elem needs to be weaker; i.e. an elem may have a table in case
of active segments, or simply be a collection of function references in
case of passive/declarative segments.
This PR takes Table::Segment out and turns it into a first class module
element just like tables and functions. It also implements early support
for parsing, printing, encoding and decoding passive/declarative elem
segments.
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This adds support for reading (elem declare func $foo .. in the text and
binary formats. We can simply ignore it: we don't need to represent it in
IR, rather we find what needs to be declared when writing. That part takes
a little more work, for which this adds a shared helper function.
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