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In WebAssembly/exception-handling#52, We decided to put `try` bodies in
a `do` clause to be more consistent with `catch`.
- Before
```wast
(try
...
(catch
...
)
)
```
- After
```wast
(try
(do
...
)
(catch
...
)
)
```
Another upside of this change is when there are multiple instructions
within a `try` body, we no longer need to wrap them in a `block`.
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`BinaryIndexes` was only used in two places (Print.cpp and
wasm-binary.h), so it didn't seem to be a great fit for
module-utils.h. This change moves it to wasm-binary.h and removes its
usage in Print.cpp. This means that function indexes are no longer
printed, but those were of limited utility and were the source of
annoying noise when updating tests, anyway.
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Function signatures were previously redundantly stored on Function
objects as well as on FunctionType objects. These two signature
representations had to always be kept in sync, which was error-prone
and needlessly complex. This PR takes advantage of the new ability of
Type to represent multiple value types by consolidating function
signatures as a pair of Types (params and results) stored on the
Function object.
Since there are no longer module-global named function types,
significant changes had to be made to the printing and emitting of
function types, as well as their parsing and manipulation in various
passes.
The C and JS APIs and their tests also had to be updated to remove
named function types.
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Previously we didn't print an additional block when there are multiple
instructions within a `try` body, so those wast files cannot be parsed
correctly, because the wast parser assumes there are two bodies within a
`try` scope: a try body and a catch body.
We don't need to print an additional block for a `catch` body because
`(catch ...)` itself serves as a scope.
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