On Mon, 10 Nov 2025 20:54:56 GMT, Alex Menkov <[email protected]> wrote:
> FollowReferences with null initial_object starts heap walking from "heap
> roots", which include system classes.
> All oops from ClassLoaderDataGraph are reported with
> JVMTI_HEAP_REFERENCE_SYSTEM_CLASS kind, but some of the objects are not
> classes.
> The fix updates FollowReferences to report non-class objects from
> ClassLoaderDataGraph as JVMTI_HEAP_REFERENCE_OTHER
>
> Testing: tier1..4,hs-tier5-svc
Changes requested by lmesnik (Reviewer).
test/hotspot/jtreg/serviceability/jvmti/FollowReferences/KindSystemClass/libKindSystemClass.cpp
line 43:
> 41: switch (reference_kind) {
> 42: case JVMTI_HEAP_REFERENCE_SYSTEM_CLASS:
> 43: *tag_ptr = ++class_counter;
The callback is executed on VMThread, so counters should be atomic or protected
by monitors.
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PR Review: https://git.openjdk.org/jdk/pull/28224#pullrequestreview-3460651314
PR Review Comment: https://git.openjdk.org/jdk/pull/28224#discussion_r2524138908
