Xiao-Feng Li wrote:
Eugene, what are tagged objects? are they non-reachable objects?
Tags are JVMTI attributes that may be assigned to an object using
SetTag() JVMTI function. These attributes may be used by heap profiler
to analyze it. Tagged objects may be reachable or not, those that aren't
reachable should be collected by GC. Take a look at JVMTI spec section
that describes heap iteration API [2].
In JVMTI code tags to objects are implemented as a pair of jlong and
object reference. These object references are enumerated as weak (see
file jvmti_tags.cpp) using gc_add_weak_root_set_entry() so GC should not
have a problem removing unreachable objects.
[1] http://java.sun.com/j2se/1.5.0/docs/guide/jvmti/jvmti.html#SetTag
[2] http://java.sun.com/j2se/1.5.0/docs/guide/jvmti/jvmti.html#Heap
On 7/21/07, Eugene S. Ostrovsky (JIRA) <[EMAIL PROTECTED]> wrote:
[drlvm][jvmti][gc] GC_gen doesn't collect tagged objects
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Key: HARMONY-4511
URL: https://issues.apache.org/jira/browse/HARMONY-4511
Project: Harmony
Issue Type: Bug
Components: DRLVM
Environment: Windows x86
Reporter: Eugene S. Ostrovsky
Objects tagged with SetTag() jvmti function are not collected by GC v5.
I'm not sure whether the bug is in GC or in jvmti heap iteration
implementaion.
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Gregory
