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When IRBuilder builds an empty non-block scope such as a function body,
an if arm, a try block, etc, it needs to produce some expression to
represent the empty contents. Previously it produced a nop, but change
it to produce an empty block instead. The binary writer and printer have
special logic to elide empty blocks, so this produces smaller output.
Update J2CLOpts to recognize functions containing empty blocks as
trivial to avoid regressing one of its tests.
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The full syntax for an expression in an element syntax looks like
`(item (ref.null none))`, but we have been printing the abbreviated
version, which omits the `(item ...)`. This abbreviation is only valid
when the item has only a single instruction, so it is not always correct
to use it. Rather than determining whether or not to use the
abbreviation on a case-by-case basis, always print the full syntax.
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Get as many of the lit tests as possible to parse with the new parser, mostly by
moving declared module items to be after imports. Also fix a bug in the new
parser's pop validation to allow supertypes of the expected type.
The two big issues that still prevent some lit tests from working correctly
under the new parser are missing support for symbolic field names and missing
support for source map annotations.
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The new wat parser is much more strict than the legacy wat parser; the latter
accepts all sorts of things that the spec does not allow. To ease an eventual
transition to using the new wat parser by default, update the tests to use the
standard text format in many places where they previously did not. We do not yet
have a way to prevent new errors from being introduced into the test suite, but
at least there will now be many fewer errors when it comes time to make the
switch.
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Previously the lit test update script interpreted module names as the names of
import items and export names as the names of export items, but it is more
precise to use the actual identifiers of the imported or exported items as the
names instead.
Update update_lit_checks.py to use a more correct regex to match names and to
correctly use the identifiers of import and export items as their names. In some
cases this can improve the readability of test output.
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This ports all tests from `test/` to `test/lit/basic/`. The set of
commands and `CHECK` lines used are the same as the ones in #6159. Now
we use `lit` to test these, this also deletes all `.wast`,
`.wast.from-wast`, `.wast.fromBinary`, and
`.wast.fromBinary.noDebugInfo` files from `test/` and all related test
routines from the python scripts.
All `CHECK` lines are generated by `update_lit_checks.py --all-items`.
This also deletes these three multi-memory tests in `test/lit/`, because
they seem to contain the same code with the ones in `test/`, which have
been ported to `test/lit/basic/` along with other tests.
- `test/lit/multi-memories-atomics64.wast`
- `test/lit/multi-memories-basics.wast`
- `test/lit/multi-memories-simd.wast`
This also adds newlines between `(func`s in case there are none to make
`CHECK` lines easy to view, and removes some extra existing newlines
here and there.
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