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This enables fuzzing EH with initial contents. fuzzing.cpp/h does not
yet support generation of EH instructions, but with this we can still
fuzz EH based on initial contents.
The fuzzer ran successfully for more than 1,900,000 iterations, with my
local modification that always enables EH and lets the fuzzer select
only EH tests for its initial contents.
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With nominal function types, this change makes it so that we preserve the
identity of the function type used with call_indirect instructions rather than
recreating a function heap type, which may or may not be the same as the
originally parsed heap type, from the function signature during module writing.
This will simplify the type system implementation by removing the need to store
a "canonical" nominal heap type for each unique signature. We previously
depended on those canonical types to avoid creating multiple duplicate function
types during module writing, but now we aren't creating any new function types
at all.
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Add a new fuzzer binary that repeatedly generates random types to find bugs in
the type system implementation. Each iteration creates some number of root types
followed by some number of subtypes thereof. Each built type can contain
arbitrary references to other built types, regardless of their order of
construction.
Right now the fuzzer only finds fatal errors in type building (and in its own
implementation), but it is meant to be extended to check other properties in the
future, such as that LUB calculations work as expected.
The logic for creating types is also intended to be integrated into the main
fuzzer in a follow-on PR so that the main fuzzer can fuzz with arbitrarily more
interesting GC types.
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Generate both nullable and non-nullable references to basic HeapTypes and
introduce `i31` and `data` HeapTypes. Generate subtypes rather than exact types
for all concrete-typed children.
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In preparation for using it from a separate file specifically for generating
random HeapTypes that has no need to depend on all of fuzzing.h.
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Having a monolithic header file containing all the implementation meant there
was no good way to split up the code or introduce new files. The new
implementation file and source directory will make it much easier to add new
fuzzing functionality in new files.
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