author | stuefe |
Wed, 09 May 2018 06:51:41 +0200 | |
changeset 50066 | bd3e4517dfa3 |
parent 49980 | 57dd7b4ba338 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2012, 2018, 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_MEMORY_METACHUNK_HPP |
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#define SHARE_VM_MEMORY_METACHUNK_HPP |
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#include "utilities/debug.hpp" |
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#include "utilities/globalDefinitions.hpp" |
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class VirtualSpaceNode; |
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// Super class of Metablock and Metachunk to allow them to |
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// be put on the FreeList and in the BinaryTreeDictionary. |
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template <class T> |
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class Metabase { |
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size_t _word_size; |
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T* _next; |
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T* _prev; |
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protected: |
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Metabase(size_t word_size) : _word_size(word_size), _next(NULL), _prev(NULL) {} |
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public: |
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T* next() const { return _next; } |
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T* prev() const { return _prev; } |
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void set_next(T* v) { _next = v; assert(v != this, "Boom");} |
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void set_prev(T* v) { _prev = v; assert(v != this, "Boom");} |
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void clear_next() { set_next(NULL); } |
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void clear_prev() { set_prev(NULL); } |
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size_t size() const volatile { return _word_size; } |
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void set_size(size_t v) { _word_size = v; } |
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void link_next(T* ptr) { set_next(ptr); } |
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void link_prev(T* ptr) { set_prev(ptr); } |
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void link_after(T* ptr) { |
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link_next(ptr); |
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if (ptr != NULL) ptr->link_prev((T*)this); |
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} |
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uintptr_t* end() const { return ((uintptr_t*) this) + size(); } |
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bool cantCoalesce() const { return false; } |
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// Debug support |
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#ifdef ASSERT |
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void* prev_addr() const { return (void*)&_prev; } |
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void* next_addr() const { return (void*)&_next; } |
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void* size_addr() const { return (void*)&_word_size; } |
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#endif |
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bool verify_chunk_in_free_list(T* tc) const { return true; } |
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bool verify_par_locked() { return true; } |
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void assert_is_mangled() const {/* Don't check "\*/} |
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bool is_free() { return true; } |
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}; |
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// Metachunk - Quantum of allocation from a Virtualspace |
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// Metachunks are reused (when freed are put on a global freelist) and |
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// have no permanent association to a SpaceManager. |
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// +--------------+ <- end --+ --+ |
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// | | | | |
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// | | | free | |
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// | | | | |
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// | | | | size | capacity |
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// | | | | |
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// | | <- top -- + | |
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// | | | | |
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// | | | used | |
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// | | | | |
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// | | | | |
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// +--------------+ <- bottom --+ --+ |
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// ChunkIndex defines the type of chunk. |
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// Chunk types differ by size: specialized < small < medium, chunks |
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// larger than medium are humongous chunks of varying size. |
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enum ChunkIndex { |
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ZeroIndex = 0, |
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SpecializedIndex = ZeroIndex, |
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SmallIndex = SpecializedIndex + 1, |
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MediumIndex = SmallIndex + 1, |
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HumongousIndex = MediumIndex + 1, |
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NumberOfFreeLists = 3, |
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NumberOfInUseLists = 4 |
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}; |
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// Utility functions. |
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size_t get_size_for_nonhumongous_chunktype(ChunkIndex chunk_type, bool is_class); |
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ChunkIndex get_chunk_type_by_size(size_t size, bool is_class); |
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ChunkIndex next_chunk_index(ChunkIndex i); |
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ChunkIndex prev_chunk_index(ChunkIndex i); |
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// Returns a descriptive name for a chunk type. |
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const char* chunk_size_name(ChunkIndex index); |
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// Verify chunk type. |
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inline bool is_valid_chunktype(ChunkIndex index) { |
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return index == SpecializedIndex || index == SmallIndex || |
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index == MediumIndex || index == HumongousIndex; |
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} |
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inline bool is_valid_nonhumongous_chunktype(ChunkIndex index) { |
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return is_valid_chunktype(index) && index != HumongousIndex; |
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} |
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enum ChunkOrigin { |
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// Chunk normally born (via take_from_committed) |
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origin_normal = 1, |
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// Chunk was born as padding chunk |
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origin_pad = 2, |
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// Chunk was born as leftover chunk in VirtualSpaceNode::retire |
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origin_leftover = 3, |
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// Chunk was born as result of a merge of smaller chunks |
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origin_merge = 4, |
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// Chunk was born as result of a split of a larger chunk |
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origin_split = 5, |
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origin_minimum = origin_normal, |
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origin_maximum = origin_split, |
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origins_count = origin_maximum + 1 |
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}; |
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inline bool is_valid_chunkorigin(ChunkOrigin origin) { |
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return origin == origin_normal || |
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origin == origin_pad || |
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origin == origin_leftover || |
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origin == origin_merge || |
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origin == origin_split; |
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} |
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class Metachunk : public Metabase<Metachunk> { |
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friend class MetachunkTest; |
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// The VirtualSpaceNode containing this chunk. |
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VirtualSpaceNode* const _container; |
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// Current allocation top. |
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MetaWord* _top; |
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// A 32bit sentinel for debugging purposes. |
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enum { CHUNK_SENTINEL = 0x4d4554EF, // "MET" |
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CHUNK_SENTINEL_INVALID = 0xFEEEEEEF |
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}; |
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uint32_t _sentinel; |
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const ChunkIndex _chunk_type; |
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const bool _is_class; |
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// Whether the chunk is free (in freelist) or in use by some class loader. |
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bool _is_tagged_free; |
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ChunkOrigin _origin; |
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int _use_count; |
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MetaWord* initial_top() const { return (MetaWord*)this + overhead(); } |
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MetaWord* top() const { return _top; } |
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public: |
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// Metachunks are allocated out of a MetadataVirtualSpace and |
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// and use some of its space to describe itself (plus alignment |
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// considerations). Metadata is allocated in the rest of the chunk. |
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// This size is the overhead of maintaining the Metachunk within |
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// the space. |
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// Alignment of each allocation in the chunks. |
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static size_t object_alignment(); |
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// Size of the Metachunk header, in words, including alignment. |
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static size_t overhead(); |
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Metachunk(ChunkIndex chunktype, bool is_class, size_t word_size, VirtualSpaceNode* container); |
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MetaWord* allocate(size_t word_size); |
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VirtualSpaceNode* container() const { return _container; } |
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MetaWord* bottom() const { return (MetaWord*) this; } |
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// Reset top to bottom so chunk can be reused. |
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void reset_empty() { _top = initial_top(); clear_next(); clear_prev(); } |
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bool is_empty() { return _top == initial_top(); } |
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// used (has been allocated) |
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// free (available for future allocations) |
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size_t word_size() const { return size(); } |
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size_t used_word_size() const; |
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size_t free_word_size() const; |
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bool is_tagged_free() { return _is_tagged_free; } |
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void set_is_tagged_free(bool v) { _is_tagged_free = v; } |
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bool contains(const void* ptr) { return bottom() <= ptr && ptr < _top; } |
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void print_on(outputStream* st) const; |
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bool is_valid_sentinel() const { return _sentinel == CHUNK_SENTINEL; } |
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void remove_sentinel() { _sentinel = CHUNK_SENTINEL_INVALID; } |
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int get_use_count() const { return _use_count; } |
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void inc_use_count() { _use_count ++; } |
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ChunkOrigin get_origin() const { return _origin; } |
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void set_origin(ChunkOrigin orig) { _origin = orig; } |
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ChunkIndex get_chunk_type() const { return _chunk_type; } |
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bool is_class() const { return _is_class; } |
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DEBUG_ONLY(void mangle(juint word_value);) |
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DEBUG_ONLY(void verify() const;) |
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}; |
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// Metablock is the unit of allocation from a Chunk. |
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// |
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// A Metablock may be reused by its SpaceManager but are never moved between |
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// SpaceManagers. There is no explicit link to the Metachunk |
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// from which it was allocated. Metablock may be deallocated and |
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// put on a freelist but the space is never freed, rather |
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// the Metachunk it is a part of will be deallocated when it's |
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// associated class loader is collected. |
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class Metablock : public Metabase<Metablock> { |
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friend class VMStructs; |
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public: |
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Metablock(size_t word_size) : Metabase<Metablock>(word_size) {} |
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}; |
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#endif // SHARE_VM_MEMORY_METACHUNK_HPP |