Mercurial > hg > truffle
annotate src/share/vm/memory/metachunk.hpp @ 15177:66e3af78ea96
HSAIL: added safepoint support
Contributed-by: Eric Caspole <eric.caspole@amd.com>
author | Doug Simon <doug.simon@oracle.com> |
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date | Thu, 17 Apr 2014 00:44:32 +0200 |
parents | 4ca6dc0799b6 |
children | 52b4284cb496 |
rev | line source |
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6885 | 1 /* |
12902 | 2 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved. |
6885 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 * | |
23 */ | |
24 #ifndef SHARE_VM_MEMORY_METACHUNK_HPP | |
25 #define SHARE_VM_MEMORY_METACHUNK_HPP | |
26 | |
12902 | 27 #include "memory/allocation.hpp" |
28 #include "utilities/debug.hpp" | |
29 #include "utilities/globalDefinitions.hpp" | |
6885 | 30 |
10175 | 31 class VirtualSpaceNode; |
32 | |
12902 | 33 // Super class of Metablock and Metachunk to allow them to |
34 // be put on the FreeList and in the BinaryTreeDictionary. | |
35 template <class T> | |
36 class Metabase VALUE_OBJ_CLASS_SPEC { | |
6885 | 37 size_t _word_size; |
12902 | 38 T* _next; |
39 T* _prev; | |
6885 | 40 |
12902 | 41 protected: |
42 Metabase(size_t word_size) : _word_size(word_size), _next(NULL), _prev(NULL) {} | |
6885 | 43 |
44 public: | |
12902 | 45 T* next() const { return _next; } |
46 T* prev() const { return _prev; } | |
47 void set_next(T* v) { _next = v; assert(v != this, "Boom");} | |
48 void set_prev(T* v) { _prev = v; assert(v != this, "Boom");} | |
49 void clear_next() { set_next(NULL); } | |
50 void clear_prev() { set_prev(NULL); } | |
6885 | 51 |
52 size_t size() const volatile { return _word_size; } | |
53 void set_size(size_t v) { _word_size = v; } | |
12902 | 54 |
55 void link_next(T* ptr) { set_next(ptr); } | |
56 void link_prev(T* ptr) { set_prev(ptr); } | |
57 void link_after(T* ptr) { | |
6885 | 58 link_next(ptr); |
12902 | 59 if (ptr != NULL) ptr->link_prev((T*)this); |
6885 | 60 } |
61 | |
12902 | 62 uintptr_t* end() const { return ((uintptr_t*) this) + size(); } |
6885 | 63 |
12902 | 64 bool cantCoalesce() const { return false; } |
6885 | 65 |
66 // Debug support | |
67 #ifdef ASSERT | |
68 void* prev_addr() const { return (void*)&_prev; } | |
69 void* next_addr() const { return (void*)&_next; } | |
70 void* size_addr() const { return (void*)&_word_size; } | |
71 #endif | |
12902 | 72 bool verify_chunk_in_free_list(T* tc) const { return true; } |
6885 | 73 bool verify_par_locked() { return true; } |
74 | |
75 void assert_is_mangled() const {/* Don't check "\*/} | |
76 | |
12902 | 77 bool is_free() { return true; } |
78 }; | |
79 | |
80 // Metachunk - Quantum of allocation from a Virtualspace | |
81 // Metachunks are reused (when freed are put on a global freelist) and | |
82 // have no permanent association to a SpaceManager. | |
83 | |
84 // +--------------+ <- end --+ --+ | |
85 // | | | | | |
86 // | | | free | | |
87 // | | | | | |
88 // | | | | size | capacity | |
89 // | | | | | |
90 // | | <- top -- + | | |
91 // | | | | | |
92 // | | | used | | |
93 // | | | | | |
94 // | | | | | |
95 // +--------------+ <- bottom --+ --+ | |
96 | |
97 class Metachunk : public Metabase<Metachunk> { | |
98 friend class TestMetachunk; | |
99 // The VirtualSpaceNode containing this chunk. | |
100 VirtualSpaceNode* _container; | |
101 | |
102 // Current allocation top. | |
103 MetaWord* _top; | |
104 | |
105 DEBUG_ONLY(bool _is_tagged_free;) | |
106 | |
107 MetaWord* initial_top() const { return (MetaWord*)this + overhead(); } | |
108 MetaWord* top() const { return _top; } | |
109 | |
110 public: | |
111 // Metachunks are allocated out of a MetadataVirtualSpace and | |
112 // and use some of its space to describe itself (plus alignment | |
113 // considerations). Metadata is allocated in the rest of the chunk. | |
114 // This size is the overhead of maintaining the Metachunk within | |
115 // the space. | |
116 | |
117 // Alignment of each allocation in the chunks. | |
118 static size_t object_alignment(); | |
119 | |
120 // Size of the Metachunk header, including alignment. | |
121 static size_t overhead(); | |
122 | |
123 Metachunk(size_t word_size , VirtualSpaceNode* container); | |
124 | |
125 MetaWord* allocate(size_t word_size); | |
126 | |
127 VirtualSpaceNode* container() const { return _container; } | |
128 | |
129 MetaWord* bottom() const { return (MetaWord*) this; } | |
130 | |
131 // Reset top to bottom so chunk can be reused. | |
132 void reset_empty() { _top = initial_top(); clear_next(); clear_prev(); } | |
133 bool is_empty() { return _top == initial_top(); } | |
134 | |
135 // used (has been allocated) | |
136 // free (available for future allocations) | |
137 size_t word_size() const { return size(); } | |
138 size_t used_word_size() const; | |
139 size_t free_word_size() const; | |
140 | |
141 #ifdef ASSERT | |
142 bool is_tagged_free() { return _is_tagged_free; } | |
143 void set_is_tagged_free(bool v) { _is_tagged_free = v; } | |
144 #endif | |
6885 | 145 |
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146 NOT_PRODUCT(void mangle();) |
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147 |
6885 | 148 void print_on(outputStream* st) const; |
149 void verify(); | |
150 }; | |
12902 | 151 |
152 // Metablock is the unit of allocation from a Chunk. | |
153 // | |
154 // A Metablock may be reused by its SpaceManager but are never moved between | |
155 // SpaceManagers. There is no explicit link to the Metachunk | |
156 // from which it was allocated. Metablock may be deallocated and | |
157 // put on a freelist but the space is never freed, rather | |
158 // the Metachunk it is a part of will be deallocated when it's | |
159 // associated class loader is collected. | |
160 | |
161 class Metablock : public Metabase<Metablock> { | |
162 friend class VMStructs; | |
163 public: | |
164 Metablock(size_t word_size) : Metabase<Metablock>(word_size) {} | |
165 }; | |
166 | |
6885 | 167 #endif // SHARE_VM_MEMORY_METACHUNK_HPP |