Mercurial > hg > graal-jvmci-8
view src/share/vm/gc_implementation/g1/heapRegionType.hpp @ 23287:bd88fd590f4e
Restore G1 changes from e13c65f874e5 after merge
author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
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date | Fri, 08 Jan 2016 15:46:55 +0100 |
parents | c02ec279b062 |
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/* * Copyright (c) 2014, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONTYPE_HPP #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONTYPE_HPP #include "memory/allocation.hpp" #define hrt_assert_is_valid(tag) \ assert(is_valid((tag)), err_msg("invalid HR type: %u", (uint) (tag))) class HeapRegionType VALUE_OBJ_CLASS_SPEC { private: // We encode the value of the heap region type so the generation can be // determined quickly. The tag is split into two parts: // // major type (young, humongous) : top N-1 bits // minor type (eden / survivor, starts / cont hum, etc.) : bottom 1 bit // // If there's need to increase the number of minor types in the // future, we'll have to increase the size of the latter and hence // decrease the size of the former. // // 0000 0 [ 0] Free // // 0001 0 Young Mask // 0001 0 [ 2] Eden // 0001 1 [ 3] Survivor // // 0010 0 Humongous Mask // 0010 0 [ 4] Humongous Starts // 0010 1 [ 5] Humongous Continues // // 01000 [ 8] Old typedef enum { FreeTag = 0, YoungMask = 2, EdenTag = YoungMask, SurvTag = YoungMask + 1, HumMask = 4, HumStartsTag = HumMask, HumContTag = HumMask + 1, OldTag = 8 } Tag; volatile Tag _tag; static bool is_valid(Tag tag); Tag get() const { hrt_assert_is_valid(_tag); return _tag; } // Sets the type to 'tag'. void set(Tag tag) { hrt_assert_is_valid(tag); hrt_assert_is_valid(_tag); _tag = tag; } // Sets the type to 'tag', expecting the type to be 'before'. This // is available for when we want to add sanity checking to the type // transition. void set_from(Tag tag, Tag before) { hrt_assert_is_valid(tag); hrt_assert_is_valid(before); hrt_assert_is_valid(_tag); assert(_tag == before, err_msg("HR tag: %u, expected: %u new tag; %u", _tag, before, tag)); _tag = tag; } public: // Queries bool is_free() const { return get() == FreeTag; } bool is_young() const { return (get() & YoungMask) != 0; } bool is_eden() const { return get() == EdenTag; } bool is_survivor() const { return get() == SurvTag; } bool is_humongous() const { return (get() & HumMask) != 0; } bool is_starts_humongous() const { return get() == HumStartsTag; } bool is_continues_humongous() const { return get() == HumContTag; } bool is_old() const { return get() == OldTag; } // Setters void set_free() { set(FreeTag); } void set_eden() { set_from(EdenTag, FreeTag); } void set_eden_pre_gc() { set_from(EdenTag, SurvTag); } void set_survivor() { set_from(SurvTag, FreeTag); } void set_starts_humongous() { set_from(HumStartsTag, FreeTag); } void set_continues_humongous() { set_from(HumContTag, FreeTag); } void set_old() { set(OldTag); } // Misc const char* get_str() const; const char* get_short_str() const; HeapRegionType() : _tag(FreeTag) { hrt_assert_is_valid(_tag); } }; #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONTYPE_HPP