author | kvn |
Thu, 27 May 2010 18:01:56 -0700 | |
changeset 5694 | 1e0532a6abff |
parent 670 | ddf3e9583f2f |
child 5547 | f4b087cbb361 |
permissions | -rw-r--r-- |
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/* |
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* Copyright 2002-2008 Sun Microsystems, Inc. All Rights Reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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* CA 95054 USA or visit www.sun.com if you need additional information or |
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* have any questions. |
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* |
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*/ |
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||
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inline void PSScavenge::save_to_space_top_before_gc() { |
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ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); |
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_to_space_top_before_gc = heap->young_gen()->to_space()->top(); |
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} |
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template <class T> inline bool PSScavenge::should_scavenge(T* p) { |
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T heap_oop = oopDesc::load_heap_oop(p); |
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if (oopDesc::is_null(heap_oop)) return false; |
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oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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return PSScavenge::is_obj_in_young((HeapWord*)obj); |
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} |
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template <class T> |
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inline bool PSScavenge::should_scavenge(T* p, MutableSpace* to_space) { |
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if (should_scavenge(p)) { |
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oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
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// Skip objects copied to to_space since the scavenge started. |
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HeapWord* const addr = (HeapWord*)obj; |
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return addr < to_space_top_before_gc() || addr >= to_space->end(); |
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} |
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return false; |
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} |
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template <class T> |
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inline bool PSScavenge::should_scavenge(T* p, bool check_to_space) { |
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if (check_to_space) { |
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ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); |
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return should_scavenge(p, heap->young_gen()->to_space()); |
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} |
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return should_scavenge(p); |
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} |
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// Attempt to "claim" oop at p via CAS, push the new obj if successful |
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// This version tests the oop* to make sure it is within the heap before |
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// attempting marking. |
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template <class T> |
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inline void PSScavenge::copy_and_push_safe_barrier(PSPromotionManager* pm, |
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T* p) { |
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assert(should_scavenge(p, true), "revisiting object?"); |
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oop o = oopDesc::load_decode_heap_oop_not_null(p); |
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oop new_obj = o->is_forwarded() |
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? o->forwardee() |
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: pm->copy_to_survivor_space(o, pm->depth_first()); |
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oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
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// We cannot mark without test, as some code passes us pointers |
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// that are outside the heap. |
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if ((!PSScavenge::is_obj_in_young((HeapWord*)p)) && |
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Universe::heap()->is_in_reserved(p)) { |
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if (PSScavenge::is_obj_in_young((HeapWord*)new_obj)) { |
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card_table()->inline_write_ref_field_gc(p, new_obj); |
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} |
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} |
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} |