RFR: JDK-8298448: UndefinedBehaviorSanitizer

[Andrew Haley]

On Fri, 9 Dec 2022 06:53:31 GMT, Justin King <jcking at openjdk.org> wrote:

> Allow building OpenJDK with UBSan. Currently the build fails when optimizing the image due to lots of undefined behavior (it invokes the built JVM). Follow up PRs will either replace the undefined behavior with well defined behavior or suppress errors which are intentional. The goal is to make OpenJDK more well defined and thus more portable across compilers and architectures.

I'm really pleased to see this.

Im working on https://github.com/openjdk/jdk/pull/10920, which fixes the last of the null pointer dereferences in x86/AArch64 HotSpot. Once that's done I'm thinking of enabling `-fsanitize=null` by default in debug builds, as long as it's not too slow.

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PR: https://git.openjdk.org/jdk/pull/11604