author | david |
Tue, 29 Sep 2015 11:02:08 +0200 | |
changeset 33105 | 294e48b4f704 |
parent 32623 | 390a27af5657 |
child 36098 | e056a98ac7ca |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2014, 2015, 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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#ifndef SHARE_VM_GC_G1_HEAPREGIONTYPE_HPP |
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#define SHARE_VM_GC_G1_HEAPREGIONTYPE_HPP |
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#include "memory/allocation.hpp" |
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#define hrt_assert_is_valid(tag) \ |
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assert(is_valid((tag)), "invalid HR type: %u", (uint) (tag)) |
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class HeapRegionType VALUE_OBJ_CLASS_SPEC { |
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private: |
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// We encode the value of the heap region type so the generation can be |
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// determined quickly. The tag is split into two parts: |
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// |
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// major type (young, old, humongous, archive) : top N-1 bits |
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// minor type (eden / survivor, starts / cont hum, etc.) : bottom 1 bit |
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// |
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// If there's need to increase the number of minor types in the |
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// future, we'll have to increase the size of the latter and hence |
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// decrease the size of the former. |
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// |
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// 0000 0 [ 0] Free |
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// |
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// 0001 0 [ 2] Young Mask |
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// 0001 0 [ 2] Eden |
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// 0001 1 [ 3] Survivor |
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// |
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// 0010 0 [ 4] Humongous Mask |
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// 0100 0 [ 8] Pinned Mask |
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// 0110 0 [12] Starts Humongous |
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// 0110 1 [13] Continues Humongous |
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// |
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// 1000 0 [16] Old Mask |
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// |
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// 1100 0 [24] Archive |
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typedef enum { |
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FreeTag = 0, |
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YoungMask = 2, |
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EdenTag = YoungMask, |
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SurvTag = YoungMask + 1, |
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HumongousMask = 4, |
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PinnedMask = 8, |
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StartsHumongousTag = HumongousMask | PinnedMask, |
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ContinuesHumongousTag = HumongousMask | PinnedMask + 1, |
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OldMask = 16, |
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OldTag = OldMask, |
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ArchiveTag = PinnedMask | OldMask |
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} Tag; |
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volatile Tag _tag; |
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static bool is_valid(Tag tag); |
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Tag get() const { |
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hrt_assert_is_valid(_tag); |
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return _tag; |
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} |
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// Sets the type to 'tag'. |
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void set(Tag tag) { |
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hrt_assert_is_valid(tag); |
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hrt_assert_is_valid(_tag); |
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_tag = tag; |
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} |
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// Sets the type to 'tag', expecting the type to be 'before'. This |
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// is available for when we want to add sanity checking to the type |
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// transition. |
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void set_from(Tag tag, Tag before) { |
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hrt_assert_is_valid(tag); |
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hrt_assert_is_valid(before); |
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hrt_assert_is_valid(_tag); |
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assert(_tag == before, "HR tag: %u, expected: %u new tag; %u", _tag, before, tag); |
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_tag = tag; |
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} |
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public: |
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// Queries |
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bool is_free() const { return get() == FreeTag; } |
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bool is_young() const { return (get() & YoungMask) != 0; } |
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bool is_eden() const { return get() == EdenTag; } |
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bool is_survivor() const { return get() == SurvTag; } |
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bool is_humongous() const { return (get() & HumongousMask) != 0; } |
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bool is_starts_humongous() const { return get() == StartsHumongousTag; } |
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bool is_continues_humongous() const { return get() == ContinuesHumongousTag; } |
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bool is_archive() const { return get() == ArchiveTag; } |
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// is_old regions may or may not also be pinned |
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bool is_old() const { return (get() & OldMask) != 0; } |
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// is_pinned regions may be archive or humongous |
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bool is_pinned() const { return (get() & PinnedMask) != 0; } |
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// Setters |
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void set_free() { set(FreeTag); } |
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void set_eden() { set_from(EdenTag, FreeTag); } |
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void set_eden_pre_gc() { set_from(EdenTag, SurvTag); } |
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void set_survivor() { set_from(SurvTag, FreeTag); } |
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void set_starts_humongous() { set_from(StartsHumongousTag, FreeTag); } |
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void set_continues_humongous() { set_from(ContinuesHumongousTag, FreeTag); } |
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void set_old() { set(OldTag); } |
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void set_archive() { set_from(ArchiveTag, FreeTag); } |
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// Misc |
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const char* get_str() const; |
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const char* get_short_str() const; |
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HeapRegionType() : _tag(FreeTag) { hrt_assert_is_valid(_tag); } |
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}; |
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#endif // SHARE_VM_GC_G1_HEAPREGIONTYPE_HPP |