RFR(M) 8222992: Shenandoah: Pre-evacuate all roots

[Aleksey Shipilev]

On 4/30/19 9:51 PM, Zhengyu Gu wrote:
> Updated webrev: http://cr.openjdk.java.net/~zgu/JDK-8222992/webrev.01/index.html

Something is wrong with the webrev. The patch has:

+void ShenandoahVerifier::verify_roots_no_forwarded() {
+  verify_at_safepoint(
+          "Roots Have Not Forwarded References",
+          _verify_forwarded_none,      // no forwarded references
+          _verify_marked_disable,      // walk only roots
+          _verify_cset_disable,        // no cset verification
+          _verify_liveness_disable,    // no reliable liveness data anymore
+          _verify_regions_notrash,     // trash regions have been recycled already
+          _verify_gcstate_disable      // no gc state check
+  );
+}

...yet webrevs has:

 943 void ShenandoahVerifier::verify_roots_no_forwarded() {
 944   guarantee(ShenandoahSafepoint::is_at_shenandoah_safepoint(), "only when nothing else happens");
 945   ShenandoahRootProcessor rp(_heap, 1, ShenandoahPhaseTimings::_num_phases); // no need for stats
 946   ShenandoahVerifyNoForwared cl;
 947   rp.process_all_roots_slow(&cl);
 948 }


I think missing roots SRP::process_all_roots_slow require a separate changeset, as it should be
backported ahead of this change to other releases;

-Aleksey