8268663: Crash when guards contain boolean expression

[lahodaj]

When Flow analyzes boolean expressions, (un-)initialized are split into (un-)initialized when true and when false. When analyzing guarded patterns, we need to handle these split values. As the only way the case's body/statements can be executed is if the case's pattern matches, we need to use the initialized values when true.

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Issue

• JDK-8268663: Crash when guards contain boolean expression

Reviewers

• Vicente Romero (@vicente-romero-oracle - Reviewer)

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[mlbridge]

Webrevs

• 01: Full - Incremental (d9e902b0)
• 00: Full (bca2461b)

[vicente-romero-oracle]

hi, I would recommend adding more tests with || in the condition, and with more than one case in the switch with conditions

[lahodaj]

Thanks, Vicente. I've added tests with || in d9e902b . One thing to note is that the tests are a bit different when writing something like: case String s && s.isEmpty() || o2 instanceof Number n -> n is not available here, as there is a path on which o2 is not a Number.

[vicente-romero-oracle]

looks good

[openjdk]

@lahodaj This change now passes all automated pre-integration checks.

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After integration, the commit message for the final commit will be:

8268663: Crash when guards contain boolean expression

Reviewed-by: vromero

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At the time when this comment was updated there had been 4 new commits pushed to the master branch:

• c088d09: 8268522: InstanceKlass::can_be_verified_at_dumptime() returns opposite value
• abe20c1: 8268333: javac crashes when pattern matching switch contains default case which is not last
• b318535: 8267579: Thread::cooked_allocated_bytes() hits assert(left >= right) failed: avoid underflow
• fe48ea9: 8268342: java/foreign/channels/TestAsyncSocketChannels.java fails with "IllegalStateException: This segment is already closed"

Please see this link for an up-to-date comparison between the source branch of this pull request and the master branch.
As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

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[lahodaj]

/integrate

[openjdk]

Going to push as commit 35d867d.
Since your change was applied there have been 11 commits pushed to the master branch:

• 4d8b5c7: 8268347: C2: nested locks optimization may create unbalanced monitor enter/exit code
• 4a6da99: 8268643: SVML lib shouldn't be generated when C2 is absent
• a5bf5e0: 8266614: update manpage for -Xlog:async
• f69e2d5: 8267397: AlgorithmId's OID cache is never refreshed
• ee30159: 8268621: SunJCE provider may throw unexpected NPE for un-initialized AES KW/KWP Ciphers
• 702e3ff: 8268366: Incorrect calculation of has_fpu_registers in C1 linear scan
• bca914b: 8268670: yield statements doesn't allow ~ or ! unary operators in expression
• c088d09: 8268522: InstanceKlass::can_be_verified_at_dumptime() returns opposite value
• abe20c1: 8268333: javac crashes when pattern matching switch contains default case which is not last
• b318535: 8267579: Thread::cooked_allocated_bytes() hits assert(left >= right) failed: avoid underflow
• ... and 1 more: https://git.openjdk.java.net/jdk17/compare/6171ae455288a74c4c3dcec6983515db04bdc360...master

Your commit was automatically rebased without conflicts.

[openjdk]

@lahodaj Pushed as commit 35d867d.

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