author | eosterlund |
Tue, 12 Nov 2019 20:01:23 +0000 | |
changeset 59038 | b9a42ca342db |
parent 58237 | 944b58cbaf93 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2015, 2019, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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|
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#include "precompiled.hpp" |
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#include "gc/z/zForwarding.inline.hpp" |
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#include "gc/z/zPage.inline.hpp" |
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#include "gc/z/zUtils.inline.hpp" |
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#include "memory/allocation.hpp" |
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#include "utilities/debug.hpp" |
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ZForwarding* ZForwarding::create(ZPage* page) { |
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// Allocate table for linear probing. The size of the table must be |
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// a power of two to allow for quick and inexpensive indexing/masking. |
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// The table is sized to have a load factor of 50%, i.e. sized to have |
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// double the number of entries actually inserted. |
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assert(page->live_objects() > 0, "Invalid value"); |
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const size_t nentries = ZUtils::round_up_power_of_2(page->live_objects() * 2); |
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return ::new (AttachedArray::alloc(nentries)) ZForwarding(page, nentries); |
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} |
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void ZForwarding::destroy(ZForwarding* forwarding) { |
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AttachedArray::free(forwarding); |
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} |
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ZForwarding::ZForwarding(ZPage* page, size_t nentries) : |
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_virtual(page->virtual_memory()), |
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_object_alignment_shift(page->object_alignment_shift()), |
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_entries(nentries), |
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_page(page), |
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_refcount(1), |
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_pinned(false) {} |
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void ZForwarding::verify() const { |
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guarantee(_refcount > 0, "Invalid refcount"); |
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guarantee(_page != NULL, "Invalid page"); |
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size_t live_objects = 0; |
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for (ZForwardingCursor i = 0; i < _entries.length(); i++) { |
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const ZForwardingEntry entry = at(&i); |
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if (!entry.populated()) { |
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// Skip empty entries |
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continue; |
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} |
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// Check from index |
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guarantee(entry.from_index() < _page->object_max_count(), "Invalid from index"); |
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// Check for duplicates |
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for (ZForwardingCursor j = i + 1; j < _entries.length(); j++) { |
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const ZForwardingEntry other = at(&j); |
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if (!other.populated()) { |
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// Skip empty entries |
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continue; |
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} |
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guarantee(entry.from_index() != other.from_index(), "Duplicate from"); |
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guarantee(entry.to_offset() != other.to_offset(), "Duplicate to"); |
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} |
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live_objects++; |
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} |
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// Check number of non-empty entries |
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guarantee(live_objects == _page->live_objects(), "Invalid number of entries"); |
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} |