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Class template argument deduction (CTAD) is a C++17 feature that allows
variables to be declared with class template types without specifying the
template parameters. Deduction guides are a mechanism by which template authors
can control how the template parameters are inferred when CTAD is used. The
Google style guide prohibits the use of CTAD except where template authors opt
in to supporting it by providing explicit deduction guides. For compatibility
with users adhering to Google style, set the compiler flag to check this
condition and add the necessary deduction guides to make the compiler happy
again.
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This PR is part of a series that adds basic support for the [typed continuations proposal](https://github.com/wasmfx/specfx).
This PR adds continuation types, of the form `(cont $foo)` for some function type `$foo`.
The only notable changes affecting existing code are the following:
- This is the first `HeapType` which has another `HeapType` (rather than, say, a `Type`) as its immediate child. This required fixes to certain traversals that have a flag for being at the toplevel of a type.
- Some shared logic for parsing `HeapType`s has been factored out.
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If the module does not have a name for a particular type, the new utility falls
back to use a different user-configurable type name generator, just like the
existing IndexedTypeNameGenerator does.
Also change how heap types are printed by this printing machinery (which is
currently only used for debugging) so that their names are printed in addition
to their contents. This makes the printer much more useful for debugging.
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Allow IndexedTypeNameGenerator to be configured with a custom prefix and also
allow it to be parameterized with an explicit fallback generator. This allows
multiple IndexedTypeNameGenerators to be composed together, for example.
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The previous printing system in the Types API would print the full recursive
structure of a Type or HeapType with special markers using de Bruijn indices to
avoid infinite recursion and a separate special marker for when the size
exceeded an arbitrary upper limit. In practice, the types printed by that system
were not human readable, so all that complexity was not useful.
Replace that system with a new system that always emits a HeapType name rather
than recursing into the structure of inner HeapTypes. Add methods for printing
Types and HeapTypes with custom HeapType name generators. Also add a new
wasm-type-printing.h header with off-the-shelf type name generators that
implement simple naming schemes sufficient for tests and the type fuzzer.
Note that these new printing methods and the old printing methods they augment
are not used for emitting text modules. Printing types as part of expressions
and modules is handled by separate code in Print.cpp and the printing API
modified in this PR is mostly used for debugging. However, the new printing
methods are general enough that Print.cpp should be able to use them as well, so
update the format used to print types in the modified printing system to match
the text format in anticipation of making that change in a follow-up PR.
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