7200470: KeepAliveClosure not needed in CodeCache::do_unloading

Summary: Removed the unused keep_alive parameter
Reviewed-by: stefank, dholmes, kamg, coleenp

src/share/vm/code/codeCache.cpp

@@ -309,12 +309,10 @@ int CodeCache::alignment_offset() {
 
 // Mark nmethods for unloading if they contain otherwise unreachable
 // oops.
-void CodeCache::do_unloading(BoolObjectClosure* is_alive,
-                             OopClosure* keep_alive,
-                             bool unloading_occurred) {
+void CodeCache::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
   assert_locked_or_safepoint(CodeCache_lock);
   FOR_ALL_ALIVE_NMETHODS(nm) {
-    nm->do_unloading(is_alive, keep_alive, unloading_occurred);
+    nm->do_unloading(is_alive, unloading_occurred);
   }
 }
 

src/share/vm/code/codeCache.hpp

@@ -130,9 +130,7 @@ class CodeCache : AllStatic {
   // If "unloading_occurred" is true, then unloads (i.e., breaks root links
   // to) any unmarked codeBlobs in the cache.  Sets "marked_for_unloading"
   // to "true" iff some code got unloaded.
-  static void do_unloading(BoolObjectClosure* is_alive,
-                           OopClosure* keep_alive,
-                           bool unloading_occurred);
+  static void do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred);
   static void oops_do(OopClosure* f) {
     CodeBlobToOopClosure oopc(f, /*do_marking=*/ false);
     blobs_do(&oopc);

src/share/vm/code/nmethod.cpp

@@ -1472,9 +1472,7 @@ void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
 
 
 // If this oop is not live, the nmethod can be unloaded.
-bool nmethod::can_unload(BoolObjectClosure* is_alive,
-                         OopClosure* keep_alive,
-                         oop* root, bool unloading_occurred) {
+bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
   assert(root != NULL, "just checking");
   oop obj = *root;
   if (obj == NULL || is_alive->do_object_b(obj)) {
@@ -1583,8 +1581,7 @@ void nmethod::post_compiled_method_unload() {
 // GC to unload an nmethod if it contains otherwise unreachable
 // oops.
 
-void nmethod::do_unloading(BoolObjectClosure* is_alive,
-                           OopClosure* keep_alive, bool unloading_occurred) {
+void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
   // Make sure the oop's ready to receive visitors
   assert(!is_zombie() && !is_unloaded(),
          "should not call follow on zombie or unloaded nmethod");
@@ -1672,7 +1669,7 @@ void nmethod::do_unloading(BoolObjectClosure* is_alive,
                   (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
              "oop must be found in exactly one place");
       if (r->oop_is_immediate() && r->oop_value() != NULL) {
-        if (can_unload(is_alive, keep_alive, r->oop_addr(), unloading_occurred)) {
+        if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
           return;
         }
       }
@@ -1684,7 +1681,7 @@ void nmethod::do_unloading(BoolObjectClosure* is_alive,
   // Scopes
   for (oop* p = oops_begin(); p < oops_end(); p++) {
     if (*p == Universe::non_oop_word())  continue;  // skip non-oops
-    if (can_unload(is_alive, keep_alive, p, unloading_occurred)) {
+    if (can_unload(is_alive, p, unloading_occurred)) {
       return;
     }
   }

src/share/vm/code/nmethod.hpp

@@ -556,10 +556,8 @@ public:
   void set_method(Method* method) { _method = method; }
 
   // GC support
-  void do_unloading(BoolObjectClosure* is_alive, OopClosure* keep_alive,
-                    bool unloading_occurred);
-  bool can_unload(BoolObjectClosure* is_alive, OopClosure* keep_alive,
-                  oop* root, bool unloading_occurred);
+  void do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred);
+  bool can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred);
 
   void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map,
                                      OopClosure* f);

src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp

@@ -5954,9 +5954,7 @@ void CMSCollector::refProcessingWork(bool asynch, bool clear_all_soft_refs) {
       bool purged_class = SystemDictionary::do_unloading(&_is_alive_closure);
 
       // Follow CodeCache roots and unload any methods marked for unloading
-      CodeCache::do_unloading(&_is_alive_closure,
-                              &cmsKeepAliveClosure,
-                              purged_class);
+      CodeCache::do_unloading(&_is_alive_closure, purged_class);
 
       cmsDrainMarkingStackClosure.do_void();
       verify_work_stacks_empty();

src/share/vm/gc_implementation/g1/g1MarkSweep.cpp

@@ -151,9 +151,7 @@ void G1MarkSweep::mark_sweep_phase1(bool& marked_for_unloading,
 
   // Follow code cache roots (has to be done after system dictionary,
   // assumes all live klasses are marked)
-  CodeCache::do_unloading(&GenMarkSweep::is_alive,
-                                   &GenMarkSweep::keep_alive,
-                                   purged_class);
+  CodeCache::do_unloading(&GenMarkSweep::is_alive, purged_class);
   GenMarkSweep::follow_stack();
 
   // Update subklass/sibling/implementor links of live klasses

src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.cpp

@@ -521,8 +521,7 @@ void PSMarkSweep::mark_sweep_phase1(bool clear_all_softrefs) {
   bool purged_class = SystemDictionary::do_unloading(is_alive_closure());
 
   // Follow code cache roots
-  CodeCache::do_unloading(is_alive_closure(), mark_and_push_closure(),
-                          purged_class);
+  CodeCache::do_unloading(is_alive_closure(), purged_class);
   follow_stack(); // Flush marking stack
 
   // Update subklass/sibling/implementor links of live klasses

src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.cpp

@@ -2375,8 +2375,7 @@ void PSParallelCompact::marking_phase(ParCompactionManager* cm,
   bool purged_class = SystemDictionary::do_unloading(is_alive_closure());
 
   // Follow code cache roots.
-  CodeCache::do_unloading(is_alive_closure(), &mark_and_push_closure,
-                          purged_class);
+  CodeCache::do_unloading(is_alive_closure(), purged_class);
   cm->follow_marking_stacks(); // Flush marking stack.
 
   // Update subklass/sibling/implementor links of live klasses

src/share/vm/memory/genMarkSweep.cpp

@@ -291,7 +291,7 @@ void GenMarkSweep::mark_sweep_phase1(int level,
   bool purged_class = SystemDictionary::do_unloading(&is_alive);
 
   // Follow code cache roots
-  CodeCache::do_unloading(&is_alive, &keep_alive, purged_class);
+  CodeCache::do_unloading(&is_alive, purged_class);
   follow_stack(); // Flush marking stack
 
   // Update subklass/sibling/implementor links of live klasses