Fuzzer: Run Two() using the Binaryen interpreter #7954
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This must wait to land on fixing the issues this finds. So far I see one with imported tags. |
tlively
reviewed
Oct 7, 2025
scripts/fuzz_opt.py
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| if output == IGNORE: | ||
| return | ||
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| if output.startswith(INSTANTIATE_ERROR): |
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We can probably skip the check below and immediately report a problem, since our interpreter did not trap in instantiation. It also might be worth checking the other direction by running V8 when the interpreter traps in instantiation to make sure V8 also traps in instantiation.
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There are host errors though which differ between VMs, like limits on array.new size etc.
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Oh, but we do handle IGNORE earlier, so you are right: only deterministic things should remain at this point. I simplified it now.
tlively
approved these changes
Oct 7, 2025
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Using our interpreter in addition to V8 allows our assertions to also
be checked, potentially finding more issues.
Also, we can run our interpreter on more code (e.g. V8 comparisons
are unreliable if there are NANs, due to V8's nondeterminism
differing from ours).
To make this work, fix execution-results to match fuzz_shell.js's
behavior: First instantiate both modules when running two of
them, and then run their exports (this makes it easy to see if
we error during instantiation).