On Tue, 6 May 2025 08:29:36 GMT, Serguei Spitsyn <[email protected]> wrote:
> This is a minor cleanup for the JVMTI `interp_only_mode` implementation which
> includes the following changes:
> - The `interp_only_mode` in `JavaThread` is represented with a counter which
> is increment and decremented. This is confusing because this value should
> only take values `0` and `1`. Asserts are placed to make sure it is never
> going out of bounds. The `interp_only_mode` in a `JavaThread` is checked by
> the interpreter chunks which expect it to be an `integer`. This cleanup has
> no intention to make it a boolean.
> - The function `JvmtiThreadState::process_pending_interp_only()` does a sync
> on the `JvmtiThreadState_lock` which is not really needed and is being
> removed. It is called in a `VTMS` transition and so, can not clash with the
> `SetEventNotificationMode` because it sets a `JvmtiVTMSTransitionDisabler`.
>
> Testing:
> - TBD: Mach5 tiers 1-6
Changes requested by lmesnik (Reviewer).
src/hotspot/share/runtime/javaThread.hpp line 1177:
> 1175: bool is_interp_only_mode() { return (_interp_only_mode
> != 0); }
> 1176: int get_interp_only_mode() { return _interp_only_mode;
> }
> 1177: int set_interp_only_mode(int val) { return _interp_only_mode
> = val; }
Ther get_interp_only_mode() /set_interp_only_mode(int val) also might be
eliminated and replaced by set/clear instead.
-------------
PR Review: https://git.openjdk.org/jdk/pull/25060#pullrequestreview-2819254877
PR Review Comment: https://git.openjdk.org/jdk/pull/25060#discussion_r2076039987
