# HG changeset patch
# User zgu
# Date 1565705031 14400
#      Tue Aug 13 10:03:51 2019 -0400
# Node ID 0feb72b8e87fd43274d5c0a330bb453547aa90dd
# Parent  ffc34eaf7b49d2c0bf84140dd39dd7b96093ed08
8229474: Shenandoah: Cleanup CM::update_roots()

diff --git a/src/hotspot/share/gc/shenandoah/shenandoahConcurrentMark.cpp b/src/hotspot/share/gc/shenandoah/shenandoahConcurrentMark.cpp
--- a/src/hotspot/share/gc/shenandoah/shenandoahConcurrentMark.cpp
+++ b/src/hotspot/share/gc/shenandoah/shenandoahConcurrentMark.cpp
@@ -276,20 +276,9 @@
 
 void ShenandoahConcurrentMark::update_roots(ShenandoahPhaseTimings::Phase root_phase) {
   assert(ShenandoahSafepoint::is_at_shenandoah_safepoint(), "Must be at a safepoint");
-
-  bool update_code_cache = true; // initialize to safer value
-  switch (root_phase) {
-    case ShenandoahPhaseTimings::update_roots:
-    case ShenandoahPhaseTimings::final_update_refs_roots:
-      update_code_cache = false;
-      break;
-    case ShenandoahPhaseTimings::full_gc_roots:
-    case ShenandoahPhaseTimings::degen_gc_update_roots:
-      update_code_cache = true;
-      break;
-    default:
-      ShouldNotReachHere();
-  }
+  assert(root_phase == ShenandoahPhaseTimings::full_gc_roots ||
+         root_phase == ShenandoahPhaseTimings::degen_gc_update_roots,
+         "Only for these phases");
 
   ShenandoahGCPhase phase(root_phase);
 
@@ -299,7 +288,7 @@
 
   uint nworkers = _heap->workers()->active_workers();
 
-  ShenandoahRootUpdater root_updater(nworkers, root_phase, update_code_cache);
+  ShenandoahRootUpdater root_updater(nworkers, root_phase);
   ShenandoahUpdateRootsTask update_roots(&root_updater);
   _heap->workers()->run_task(&update_roots);
 
diff --git a/src/hotspot/share/gc/shenandoah/shenandoahRootProcessor.cpp b/src/hotspot/share/gc/shenandoah/shenandoahRootProcessor.cpp
--- a/src/hotspot/share/gc/shenandoah/shenandoahRootProcessor.cpp
+++ b/src/hotspot/share/gc/shenandoah/shenandoahRootProcessor.cpp
@@ -184,10 +184,9 @@
   _dedup_roots.oops_do(&always_true, oops, worker_id);
 }
 
-ShenandoahRootUpdater::ShenandoahRootUpdater(uint n_workers, ShenandoahPhaseTimings::Phase phase, bool update_code_cache) :
+ShenandoahRootUpdater::ShenandoahRootUpdater(uint n_workers, ShenandoahPhaseTimings::Phase phase) :
   ShenandoahRootProcessor(phase),
-  _thread_roots(n_workers > 1),
-  _update_code_cache(update_code_cache) {
+  _thread_roots(n_workers > 1) {
 }
 
 ShenandoahRootAdjuster::ShenandoahRootAdjuster(uint n_workers, ShenandoahPhaseTimings::Phase phase) :
diff --git a/src/hotspot/share/gc/shenandoah/shenandoahRootProcessor.hpp b/src/hotspot/share/gc/shenandoah/shenandoahRootProcessor.hpp
--- a/src/hotspot/share/gc/shenandoah/shenandoahRootProcessor.hpp
+++ b/src/hotspot/share/gc/shenandoah/shenandoahRootProcessor.hpp
@@ -295,10 +295,9 @@
   ShenandoahWeakRoots<false /*concurrent*/>                 _weak_roots;
   ShenandoahStringDedupRoots                                _dedup_roots;
   ShenandoahCodeCacheRoots<ShenandoahCsetCodeRootsIterator> _code_roots;
-  const bool                                                _update_code_cache;
 
 public:
-  ShenandoahRootUpdater(uint n_workers, ShenandoahPhaseTimings::Phase phase, bool update_code_cache);
+  ShenandoahRootUpdater(uint n_workers, ShenandoahPhaseTimings::Phase phase);
 
   template<typename IsAlive, typename KeepAlive>
   void roots_do(uint worker_id, IsAlive* is_alive, KeepAlive* keep_alive);
diff --git a/src/hotspot/share/gc/shenandoah/shenandoahRootProcessor.inline.hpp b/src/hotspot/share/gc/shenandoah/shenandoahRootProcessor.inline.hpp
--- a/src/hotspot/share/gc/shenandoah/shenandoahRootProcessor.inline.hpp
+++ b/src/hotspot/share/gc/shenandoah/shenandoahRootProcessor.inline.hpp
@@ -272,10 +272,7 @@
 
   _thread_roots.oops_do(keep_alive, NULL, worker_id);
   _cld_roots.cld_do(&clds, worker_id);
-
-  if(_update_code_cache) {
-    _code_roots.code_blobs_do(&update_blobs, worker_id);
-  }
+  _code_roots.code_blobs_do(&update_blobs, worker_id);
 
   _serial_weak_roots.weak_oops_do(is_alive, keep_alive, worker_id);
   _weak_roots.weak_oops_do(is_alive, keep_alive, worker_id);
diff --git a/src/hotspot/share/gc/shenandoah/shenandoahTraversalGC.cpp b/src/hotspot/share/gc/shenandoah/shenandoahTraversalGC.cpp
--- a/src/hotspot/share/gc/shenandoah/shenandoahTraversalGC.cpp
+++ b/src/hotspot/share/gc/shenandoah/shenandoahTraversalGC.cpp
@@ -706,7 +706,7 @@
 #if COMPILER2_OR_JVMCI
   DerivedPointerTable::clear();
 #endif
-  ShenandoahRootUpdater rp(_heap->workers()->active_workers(), ShenandoahPhaseTimings::final_traversal_update_roots, true /* update code cache */);
+  ShenandoahRootUpdater rp(_heap->workers()->active_workers(), ShenandoahPhaseTimings::final_traversal_update_roots);
   ShenandoahTraversalFixRootsTask update_roots_task(&rp);
   _heap->workers()->run_task(&update_roots_task);
 #if COMPILER2_OR_JVMCI