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Moves the feature validation unit test file to a new directory,
'unit', and adds new tests for SIMD and sign-ext. Adds validation for
v128 globals and v128.const.
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unittest is Python's standard testing framework, so this change allows
arbitrary tests to be written without introducing any new dependencies
or code in check.py. A new test that was not possible to write before
is also included. It is the first of many.
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I think I added this error for fuzzing, but it is harmful as it prevents a module with too many locals from being loaded - if we could load it, we might be able to optimize it to have fewer locals...
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* show a proper error for an empty asm2wasm input
* handle end of input in processExpressions in binary reading
* memory segment sizes should be unsigned
* validate input in wasm-ctor-eval
* update tests
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* Error if there are more locals than browsers allow (50,000). We usually just warn about stuff like this, but we do need some limit (or else we hang or OOM), and if so, why not use the agreed-upon Web limit.
* Do not generate nice string names for locals in binary parsing - the name is just $var$x instead of $x, so not much benefit, and worse as our names are interned this is actually slow (which is why the fuzz testcase here hangs instead of OOMing).
Testcases and bugreport in #1663.
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* Check if there is a currFunction before using it (we need it for some stacky code; a valid wasm wouldn't need a function in that location anyhow, as what can be put in a memory/table offset is very limited).
* Huge alignment led us to do a power of 2 shift that is undefined behavior.
Also adds a test facility to check we don't crash on testcases.
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