Mercurial > hg > truffle
annotate src/share/vm/services/memoryUsage.hpp @ 14714:b602356a9cfc
additional canonicalizers for accesses and value nodes (improves number of implicit null checks)
author | Lukas Stadler <lukas.stadler@oracle.com> |
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date | Thu, 20 Mar 2014 17:15:36 +0100 |
parents | de6a9e811145 |
children | 4ca6dc0799b6 |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_SERVICES_MEMORYUSAGE_HPP |
26 #define SHARE_VM_SERVICES_MEMORYUSAGE_HPP | |
27 | |
28 #include "utilities/globalDefinitions.hpp" | |
29 | |
0 | 30 // A memory usage contains the following attributes about memory usage: |
31 // initSize - represents the initial amount of memory (in bytes) that | |
32 // the Java virtual machine requests from the operating system | |
33 // for memory management. The Java virtual machine may request | |
34 // additional memory from the operating system later when appropriate. | |
35 // Its value may be undefined. | |
36 // used - represents the amount of memory currently used (in bytes). | |
37 // committed - represents the amount of memory (in bytes) that is | |
38 // guaranteed to be available for use by the Java virtual machine. | |
39 // The amount of committed memory may change over time (increase | |
40 // or decrease). It is guaranteed to be greater than or equal | |
41 // to initSize. | |
42 // maxSize - represents the maximum amount of memory (in bytes) | |
43 // that can be used for memory management. The maximum amount of | |
44 // memory for memory management could be less than the amount of | |
45 // committed memory. Its value may be undefined. | |
46 | |
47 class MemoryUsage VALUE_OBJ_CLASS_SPEC { | |
48 private: | |
49 size_t _initSize; | |
50 size_t _used; | |
51 size_t _committed; | |
52 size_t _maxSize; | |
53 | |
54 public: | |
55 // Constructors | |
56 MemoryUsage(size_t i, size_t u, size_t c, size_t m) : | |
57 _initSize(i), _used(u), _committed(c), _maxSize(m) {}; | |
58 MemoryUsage() : | |
59 _initSize(0), _used(0), _committed(0), _maxSize(0) {}; | |
60 | |
61 size_t init_size() const { return _initSize; } | |
62 size_t used() const { return _used; } | |
63 size_t committed() const { return _committed; } | |
64 size_t max_size() const { return _maxSize; } | |
65 | |
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66 static size_t undefined_size() { return (size_t) -1; } |
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67 |
0 | 68 inline static jlong convert_to_jlong(size_t val) { |
69 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). | |
70 jlong ret; | |
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71 if (val == undefined_size()) { |
0 | 72 ret = -1L; |
73 } else { | |
74 NOT_LP64(ret = val;) | |
75 LP64_ONLY(ret = MIN2(val, (size_t)max_jlong);) | |
76 } | |
77 return ret; | |
78 } | |
79 | |
80 jlong init_size_as_jlong() const { return convert_to_jlong(_initSize); } | |
81 jlong used_as_jlong() const { return convert_to_jlong(_used); } | |
82 jlong committed_as_jlong() const { return convert_to_jlong(_committed); } | |
83 jlong max_size_as_jlong() const { return convert_to_jlong(_maxSize); } | |
84 }; | |
1972 | 85 |
86 #endif // SHARE_VM_SERVICES_MEMORYUSAGE_HPP |