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hotspot/src/share/vm/gc_implementation/parallelScavenge/psPromotionManager.inline.hpp

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+/*
+ * Copyright 2002-2006 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+inline PSPromotionManager* PSPromotionManager::manager_array(int index) {
+  assert(_manager_array != NULL, "access of NULL manager_array");
+  assert(index >= 0 && index <= (int)ParallelGCThreads, "out of range manager_array access");
+  return _manager_array[index];
+}
+
+inline void PSPromotionManager::claim_or_forward_internal_depth(oop* p) {
+  if (p != NULL) {
+    oop o = *p;
+    if (o->is_forwarded()) {
+      o = o->forwardee();
+
+      // Card mark
+      if (PSScavenge::is_obj_in_young((HeapWord*) o)) {
+        PSScavenge::card_table()->inline_write_ref_field_gc(p, o);
+      }
+      *p = o;
+    } else {
+      push_depth(p);
+    }
+  }
+}
+
+inline void PSPromotionManager::claim_or_forward_internal_breadth(oop* p) {
+  if (p != NULL) {
+    oop o = *p;
+    if (o->is_forwarded()) {
+      o = o->forwardee();
+    } else {
+      o = copy_to_survivor_space(o, false);
+    }
+
+    // Card mark
+    if (PSScavenge::is_obj_in_young((HeapWord*) o)) {
+      PSScavenge::card_table()->inline_write_ref_field_gc(p, o);
+    }
+    *p = o;
+  }
+}
+
+inline void PSPromotionManager::flush_prefetch_queue() {
+  assert(!depth_first(), "invariant");
+  for (int i=0; i<_prefetch_queue.length(); i++) {
+    claim_or_forward_internal_breadth(_prefetch_queue.pop());
+  }
+}
+
+inline void PSPromotionManager::claim_or_forward_depth(oop* p) {
+  assert(depth_first(), "invariant");
+  assert(PSScavenge::should_scavenge(*p, true), "revisiting object?");
+  assert(Universe::heap()->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
+  assert(Universe::heap()->is_in(p), "pointer outside heap");
+
+  claim_or_forward_internal_depth(p);
+}
+
+inline void PSPromotionManager::claim_or_forward_breadth(oop* p) {
+  assert(!depth_first(), "invariant");
+  assert(PSScavenge::should_scavenge(*p, true), "revisiting object?");
+  assert(Universe::heap()->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
+  assert(Universe::heap()->is_in(p), "pointer outside heap");
+
+  if (UsePrefetchQueue) {
+    claim_or_forward_internal_breadth(_prefetch_queue.push_and_pop(p));
+  } else {
+    // This option is used for testing.  The use of the prefetch
+    // queue can delay the processing of the objects and thus
+    // change the order of object scans.  For example, remembered
+    // set updates are typically the clearing of the remembered
+    // set (the cards) followed by updates of the remembered set
+    // for young-to-old pointers.  In a situation where there
+    // is an error in the sequence of clearing and updating
+    // (e.g. clear card A, update card A, erroneously clear
+    // card A again) the error can be obscured by a delay
+    // in the update due to the use of the prefetch queue
+    // (e.g., clear card A, erroneously clear card A again,
+    // update card A that was pushed into the prefetch queue
+    // and thus delayed until after the erronous clear).  The
+    // length of the delay is random depending on the objects
+    // in the queue and the delay can be zero.
+    claim_or_forward_internal_breadth(p);
+  }
+}
+
+inline void PSPromotionManager::process_popped_location_depth(oop* p) {
+  if (is_oop_masked(p)) {
+    assert(PSChunkLargeArrays, "invariant");
+    oop const old = unmask_chunked_array_oop(p);
+    process_array_chunk(old);
+  } else {
+    PSScavenge::copy_and_push_safe_barrier(this, p);
+  }
+}