RFR: JDK-8294902: Undefined Behavior in C2 regalloc with null references [v9]
Andrew Haley
aph at openjdk.org
Mon Dec 12 14:51:22 UTC 2022
> This patch fixes the remaining null pointer dereference bugs that I know of.
>
> For the main bug, C2 was using a null reference to indicate an uninitialized `Node_List`. I replaced the null reference with a static sentinel.
>
> I also turned on `-fsanitize=null` and found and fixed a bunch of other null pointer dereferences. With this,I have run a full bootstrap and tier1 tests with `-fsanitize=null` enabled.
>
> I have checked that the code generated by GCC is not worse in any significant way, so I don't expect to see any performance regressions.
>
> I'd like to enable `-fsanitize=null` in debug builds to prevent regressions in this area. What do you think?
Andrew Haley has updated the pull request incrementally with one additional commit since the last revision:
Reviewer feedback
-------------
Changes:
- all: https://git.openjdk.org/jdk/pull/10920/files
- new: https://git.openjdk.org/jdk/pull/10920/files/812ce8fc..35e93fe8
Webrevs:
- full: https://webrevs.openjdk.org/?repo=jdk&pr=10920&range=08
- incr: https://webrevs.openjdk.org/?repo=jdk&pr=10920&range=07-08
Stats: 12 lines in 1 file changed: 7 ins; 0 del; 5 mod
Patch: https://git.openjdk.org/jdk/pull/10920.diff
Fetch: git fetch https://git.openjdk.org/jdk pull/10920/head:pull/10920
PR: https://git.openjdk.org/jdk/pull/10920
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