8232856: jshell crashes when pressing up arrow after /!

[lahodaj]

When re-running snippets, we remove the last entry (which is e.g. '/!'), and then put the expanded code back. But, while adding the code back, it is detected the entry-to-be-added duplicates the previous entry and is not added. But an internal "index" value is not updated, and still has the value it had before the removal, leading to inconsistency in the history internal data, and eventually, to a crash. Calling resetIndex() should fix the internal data.

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Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• Change must be properly reviewed

Testing

	Linux x64	Linux x86	Windows x64	macOS x64
Build	✔️ (5/5 passed)	✔️ (2/2 passed)	✔️ (2/2 passed)	✔️ (2/2 passed)
Test (tier1)	✔️ (9/9 passed)	✔️ (9/9 passed)	❌ (2/9 failed)	❌ (1/9 failed)

Failed test tasks

• Windows x64 (hs/tier1 gc)
• Windows x64 (hs/tier1 serviceability)
• macOS x64 (hs/tier1 gc)

Issue

• JDK-8232856: jshell crashes when pressing up arrow after /!

Reviewers

• Paul Sandoz (@PaulSandoz - Reviewer)

Download

$ git fetch https://git.openjdk.java.net/jdk pull/173/head:pull/173
$ git checkout pull/173

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[openjdk]

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[mlbridge]

Webrevs

• 01: Full - Incremental (3d501d5)
• 00: Full (334380a)

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[openjdk]

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

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

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

8232856: jshell crashes when pressing up arrow after /!

Reviewed-by: psandoz

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 19 new commits pushed to the master branch:

• 700447f: 8255909: Remove unused delayed_value methods
• 397972e: 8255848: -Xlog:gc+heap+exit shows "used 0K"
• eb85b8d: 8255665: C2 should aggressively remove temporary hook nodes
• 18bc95b: 8250625: Compiler implementation of Pattern Matching for instanceof (Final)
• 60e4aca: 8255890: Zero: remove unused methods from BytecodeInterpreter
• 397bae2: 8255860: Clean up CDS logging related to lambda
• 97a81ce: 8253385: annotation processors remove varargs information from record components
• 166c728: 8255858: Add debug agent support for storing thread names
• a0ade22: 8255900: x86: Reduce impact when VerifyOops is disabled
• 29db1dc: 8255886: Shenandoah: Resolve cset address truncation and register clash in interpreter LRB
• ... and 9 more: https://git.openjdk.java.net/jdk/compare/7f4d873dd9492c128e98737eb4651a29387269e8...master

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.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[lahodaj]

/integrate

[openjdk]

@lahodaj Since your change was applied there have been 19 commits pushed to the master branch:

• 700447f: 8255909: Remove unused delayed_value methods
• 397972e: 8255848: -Xlog:gc+heap+exit shows "used 0K"
• eb85b8d: 8255665: C2 should aggressively remove temporary hook nodes
• 18bc95b: 8250625: Compiler implementation of Pattern Matching for instanceof (Final)
• 60e4aca: 8255890: Zero: remove unused methods from BytecodeInterpreter
• 397bae2: 8255860: Clean up CDS logging related to lambda
• 97a81ce: 8253385: annotation processors remove varargs information from record components
• 166c728: 8255858: Add debug agent support for storing thread names
• a0ade22: 8255900: x86: Reduce impact when VerifyOops is disabled
• 29db1dc: 8255886: Shenandoah: Resolve cset address truncation and register clash in interpreter LRB
• ... and 9 more: https://git.openjdk.java.net/jdk/compare/7f4d873dd9492c128e98737eb4651a29387269e8...master

Your commit was automatically rebased without conflicts.

Pushed as commit cdef186.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.