RFR: 8333639: ubsan: cppVtables.cpp:81:55: runtime error: index 14 out of bounds for type 'long int [1]' [v2]

[Kim Barrett]

On Mon, 10 Jun 2024 13:34:22 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

>> We shouldn't specify a wrong array length which causes undefined behavior. Using a "flexible array member".
>
> Martin Doerr has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Flexible array members are not specified by C++.

There are a number of "fake" VLA usage in HotSpot.  Some of them have come up in recent ubsan cleanups for similar
reasons as here.  There's a pattern that has been used in at least some of those places.  See the class BufferNode in
share/gc/shared/bufferNode.hpp, for example.  It would be nice to only have one pattern for this "feature".

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PR Comment: https://git.openjdk.org/jdk/pull/19623#issuecomment-2159138736