author | stefank |
Fri, 13 Sep 2013 22:22:14 +0200 | |
changeset 19991 | d0d0186a8cd6 |
parent 17101 | 3a82a58d9aa9 |
child 20729 | 0a687ee7097d |
permissions | -rw-r--r-- |
14123 | 1 |
/* |
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* Copyright (c) 2012, 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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// 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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||
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// +--------------+ <- end |
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// | | --+ ---+ |
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// | | | free | |
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// | | | | |
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// | | | | 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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||
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class VirtualSpaceNode; |
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class Metachunk VALUE_OBJ_CLASS_SPEC { |
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// link to support lists of chunks |
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Metachunk* _next; |
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Metachunk* _prev; |
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VirtualSpaceNode* _container; |
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MetaWord* _bottom; |
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MetaWord* _end; |
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MetaWord* _top; |
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size_t _word_size; |
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// Used in a guarantee() so included in the Product builds |
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// even through it is only for debugging. |
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bool _is_free; |
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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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static size_t _overhead; |
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public: |
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Metachunk(size_t word_size , VirtualSpaceNode* container); |
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// Used to add a Metachunk to a list of Metachunks |
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void set_next(Metachunk* v) { _next = v; assert(v != this, "Boom");} |
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void set_prev(Metachunk* v) { _prev = v; assert(v != this, "Boom");} |
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void set_container(VirtualSpaceNode* v) { _container = v; } |
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MetaWord* allocate(size_t word_size); |
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// Accessors |
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Metachunk* next() const { return _next; } |
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Metachunk* prev() const { return _prev; } |
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VirtualSpaceNode* container() const { return _container; } |
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MetaWord* bottom() const { return _bottom; } |
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MetaWord* end() const { return _end; } |
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MetaWord* top() const { return _top; } |
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size_t word_size() const { return _word_size; } |
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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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bool is_free() { return _is_free; } |
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void set_is_free(bool v) { _is_free = v; } |
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static size_t overhead() { return _overhead; } |
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void clear_next() { set_next(NULL); } |
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void link_prev(Metachunk* ptr) { set_prev(ptr); } |
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uintptr_t* end() { return ((uintptr_t*) this) + size(); } |
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bool cantCoalesce() const { return false; } |
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void link_next(Metachunk* ptr) { set_next(ptr); } |
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void link_after(Metachunk* ptr){ |
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link_next(ptr); |
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if (ptr != NULL) ptr->link_prev(this); |
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} |
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// Reset top to bottom so chunk can be reused. |
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15086
2bfd799e9147
8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
jmasa
parents:
14588
diff
changeset
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void reset_empty() { _top = (_bottom + _overhead); _next = NULL; _prev = NULL; } |
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bool is_empty() { return _top == (_bottom + _overhead); } |
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// used (has been allocated) |
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// free (available for future allocations) |
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// capacity (total size of chunk) |
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15086
2bfd799e9147
8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
jmasa
parents:
14588
diff
changeset
|
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size_t used_word_size() const; |
2bfd799e9147
8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
jmasa
parents:
14588
diff
changeset
|
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size_t free_word_size() const; |
2bfd799e9147
8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
jmasa
parents:
14588
diff
changeset
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size_t capacity_word_size()const; |
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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(Metachunk* 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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14588
8ec26d2d9339
8000662: NPG: nashorn ant clean test262 out-of-memory with Java heap
coleenp
parents:
14123
diff
changeset
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NOT_PRODUCT(void mangle();) |
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void print_on(outputStream* st) const; |
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void verify(); |
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}; |
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#endif // SHARE_VM_MEMORY_METACHUNK_HPP |