1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/gc_implementation/g1/heapRegionType.hpp Tue Sep 16 14:27:40 2014 +0200
1.3 @@ -0,0 +1,134 @@
1.4 +/*
1.5 + * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONTYPE_HPP
1.29 +#define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONTYPE_HPP
1.30 +
1.31 +#include "memory/allocation.hpp"
1.32 +
1.33 +#define hrt_assert_is_valid(tag) \
1.34 + assert(is_valid((tag)), err_msg("invalid HR type: %u", (uint) (tag)))
1.35 +
1.36 +class HeapRegionType VALUE_OBJ_CLASS_SPEC {
1.37 +private:
1.38 + // We encode the value of the heap region type so the generation can be
1.39 + // determined quickly. The tag is split into two parts:
1.40 + //
1.41 + // major type (young, humongous) : top N-1 bits
1.42 + // minor type (eden / survivor, starts / cont hum, etc.) : bottom 1 bit
1.43 + //
1.44 + // If there's need to increase the number of minor types in the
1.45 + // future, we'll have to increase the size of the latter and hence
1.46 + // decrease the size of the former.
1.47 + //
1.48 + // 0000 0 [ 0] Free
1.49 + //
1.50 + // 0001 0 Young Mask
1.51 + // 0001 0 [ 2] Eden
1.52 + // 0001 1 [ 3] Survivor
1.53 + //
1.54 + // 0010 0 Humongous Mask
1.55 + // 0010 0 [ 4] Humongous Starts
1.56 + // 0010 1 [ 5] Humongous Continues
1.57 + //
1.58 + // 01000 [ 8] Old
1.59 + typedef enum {
1.60 + FreeTag = 0,
1.61 +
1.62 + YoungMask = 2,
1.63 + EdenTag = YoungMask,
1.64 + SurvTag = YoungMask + 1,
1.65 +
1.66 + HumMask = 4,
1.67 + HumStartsTag = HumMask,
1.68 + HumContTag = HumMask + 1,
1.69 +
1.70 + OldTag = 8
1.71 + } Tag;
1.72 +
1.73 + volatile Tag _tag;
1.74 +
1.75 + static bool is_valid(Tag tag);
1.76 +
1.77 + Tag get() const {
1.78 + hrt_assert_is_valid(_tag);
1.79 + return _tag;
1.80 + }
1.81 +
1.82 + // Sets the type to 'tag'.
1.83 + void set(Tag tag) {
1.84 + hrt_assert_is_valid(tag);
1.85 + hrt_assert_is_valid(_tag);
1.86 + _tag = tag;
1.87 + }
1.88 +
1.89 + // Sets the type to 'tag', expecting the type to be 'before'. This
1.90 + // is available for when we want to add sanity checking to the type
1.91 + // transition.
1.92 + void set_from(Tag tag, Tag before) {
1.93 + hrt_assert_is_valid(tag);
1.94 + hrt_assert_is_valid(before);
1.95 + hrt_assert_is_valid(_tag);
1.96 + assert(_tag == before,
1.97 + err_msg("HR tag: %u, expected: %u new tag; %u", _tag, before, tag));
1.98 + _tag = tag;
1.99 + }
1.100 +
1.101 +public:
1.102 + // Queries
1.103 +
1.104 + bool is_free() const { return get() == FreeTag; }
1.105 +
1.106 + bool is_young() const { return (get() & YoungMask) != 0; }
1.107 + bool is_eden() const { return get() == EdenTag; }
1.108 + bool is_survivor() const { return get() == SurvTag; }
1.109 +
1.110 + bool is_humongous() const { return (get() & HumMask) != 0; }
1.111 + bool is_starts_humongous() const { return get() == HumStartsTag; }
1.112 + bool is_continues_humongous() const { return get() == HumContTag; }
1.113 +
1.114 + bool is_old() const { return get() == OldTag; }
1.115 +
1.116 + // Setters
1.117 +
1.118 + void set_free() { set(FreeTag); }
1.119 +
1.120 + void set_eden() { set_from(EdenTag, FreeTag); }
1.121 + void set_eden_pre_gc() { set_from(EdenTag, SurvTag); }
1.122 + void set_survivor() { set_from(SurvTag, FreeTag); }
1.123 +
1.124 + void set_starts_humongous() { set_from(HumStartsTag, FreeTag); }
1.125 + void set_continues_humongous() { set_from(HumContTag, FreeTag); }
1.126 +
1.127 + void set_old() { set(OldTag); }
1.128 +
1.129 + // Misc
1.130 +
1.131 + const char* get_str() const;
1.132 + const char* get_short_str() const;
1.133 +
1.134 + HeapRegionType() : _tag(FreeTag) { hrt_assert_is_valid(_tag); }
1.135 +};
1.136 +
1.137 +#endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONTYPE_HPP
