RFR: 8346143: add ClearAllFramePops function to speedup debugger single stepping in some cases [v9]

Serguei Spitsyn sspitsyn at openjdk.org
Tue Jan 7 19:53:20 UTC 2025


> New JVMTI function `ClearAllFramePops` will help to speedup debugger single stepping in some cases.
> Additionally, the JVMTI `NotifyFramePop` implementation was fixed to return `JVMTI_ERROR_DUPLICATE` to make it consistent with the `SetBreakpoint` which also returns this error.
> 
> The JDWP agent fix will be needed to make use of this new JVMTI function. The corresponding debugger bug is:
> [8229012](https://bugs.openjdk.org/browse/JDK-8229012): When single stepping, the debug agent can cause the thread to remain in interpreter mode after single stepping completes
> 
> CSR: [8346144](https://bugs.openjdk.org/browse/JDK-8346144): add ClearAllFramePops function to speedup debugger single stepping in some cases
> 
> Testing:
>  - mach5 tiers 1-6 were run to make sure this fix caused no regressions
>  - Chris tested the JVMTI patch with his JDWP fix of [8229012](https://bugs.openjdk.org/browse/JDK-8229012).

Serguei Spitsyn has updated the pull request incrementally with one additional commit since the last revision:

  update ciopyright year

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/22744/files
  - new: https://git.openjdk.org/jdk/pull/22744/files/6a8e37aa..4682bcba

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22744&range=08
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22744&range=07-08

  Stats: 11 lines in 11 files changed: 0 ins; 0 del; 11 mod
  Patch: https://git.openjdk.org/jdk/pull/22744.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22744/head:pull/22744

PR: https://git.openjdk.org/jdk/pull/22744


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