fix: Protect against GC from validate_bytes#1447
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Co-authored-by: Kat Marchán <kzm@zkat.tech>
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In the case that it is given an
ArrayBufferView,validate_bytesreturns a pointer to a buffer that may be GC'ed. The current uses ofvalidate_bytesare careful to not add any potentially GC-triggering calls between the call tovalidate_bytesand hostcalls, but this may change in the future, and there is nothing in place to ensure the GC does not occur. As such, this PR changesvalidate_bytesto additionally return an optional GC guard, that calling code can hold on to to ensure there is no GC at runtime while the pointer is live.Honestly I'm not sure this is all worth it and I'm tempted to just return a
std::vectorfrom that function, but I figured I'd avoid regressing performance in this case while adding some additional safety.There is no test for this PR, because it is adding defensive code for potential future uses of
validate_bytes, or changes to existing callers.