Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/parallelScavenge/psVirtualspace.hpp @ 1656:4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
Summary: G1 was not handling explicit GCs correctly in many ways. It does now. See the CR for the list of improvements contained in this changeset.
Reviewed-by: iveresov, ysr, johnc
author | tonyp |
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date | Mon, 28 Jun 2010 14:13:17 -0400 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2009, 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 | |
25 // VirtualSpace for the parallel scavenge collector. | |
26 // | |
27 // VirtualSpace is data structure for committing a previously reserved address | |
28 // range in smaller chunks. | |
29 | |
30 class PSVirtualSpace : public CHeapObj { | |
31 friend class VMStructs; | |
32 protected: | |
33 // The space is committed/uncommited in chunks of size _alignment. The | |
34 // ReservedSpace passed to initialize() must be aligned to this value. | |
35 const size_t _alignment; | |
36 | |
37 // Reserved area | |
38 char* _reserved_low_addr; | |
39 char* _reserved_high_addr; | |
40 | |
41 // Committed area | |
42 char* _committed_low_addr; | |
43 char* _committed_high_addr; | |
44 | |
45 // The entire space has been committed and pinned in memory, no | |
46 // os::commit_memory() or os::uncommit_memory(). | |
47 bool _special; | |
48 | |
49 // Convenience wrapper. | |
50 inline static size_t pointer_delta(const char* left, const char* right); | |
51 | |
52 public: | |
53 PSVirtualSpace(ReservedSpace rs, size_t alignment); | |
54 PSVirtualSpace(ReservedSpace rs); | |
55 | |
56 ~PSVirtualSpace(); | |
57 | |
58 // Eventually all instances should be created with the above 1- or 2-arg | |
59 // constructors. Then the 1st constructor below should become protected and | |
60 // the 2nd ctor and initialize() removed. | |
61 PSVirtualSpace(size_t alignment): _alignment(alignment) { } | |
62 PSVirtualSpace(); | |
63 bool initialize(ReservedSpace rs, size_t commit_size); | |
64 | |
65 bool contains(void* p) const; | |
66 | |
67 // Accessors (all sizes are bytes). | |
68 size_t alignment() const { return _alignment; } | |
69 char* reserved_low_addr() const { return _reserved_low_addr; } | |
70 char* reserved_high_addr() const { return _reserved_high_addr; } | |
71 char* committed_low_addr() const { return _committed_low_addr; } | |
72 char* committed_high_addr() const { return _committed_high_addr; } | |
73 bool special() const { return _special; } | |
74 | |
75 inline size_t committed_size() const; | |
76 inline size_t reserved_size() const; | |
77 inline size_t uncommitted_size() const; | |
78 | |
79 // Operations. | |
80 inline void set_reserved(char* low_addr, char* high_addr, bool special); | |
81 inline void set_reserved(ReservedSpace rs); | |
82 inline void set_committed(char* low_addr, char* high_addr); | |
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83 virtual bool expand_by(size_t bytes); |
0 | 84 virtual bool shrink_by(size_t bytes); |
85 virtual size_t expand_into(PSVirtualSpace* space, size_t bytes); | |
86 void release(); | |
87 | |
88 #ifndef PRODUCT | |
89 // Debugging | |
90 static bool is_aligned(size_t val, size_t align); | |
91 bool is_aligned(size_t val) const; | |
92 bool is_aligned(char* val) const; | |
93 void verify() const; | |
94 void print() const; | |
95 virtual bool grows_up() const { return true; } | |
96 bool grows_down() const { return !grows_up(); } | |
97 | |
98 // Helper class to verify a space when entering/leaving a block. | |
99 class PSVirtualSpaceVerifier: public StackObj { | |
100 private: | |
101 const PSVirtualSpace* const _space; | |
102 public: | |
103 PSVirtualSpaceVerifier(PSVirtualSpace* space): _space(space) { | |
104 _space->verify(); | |
105 } | |
106 ~PSVirtualSpaceVerifier() { _space->verify(); } | |
107 }; | |
108 #endif | |
109 | |
110 virtual void print_space_boundaries_on(outputStream* st) const; | |
111 | |
112 // Included for compatibility with the original VirtualSpace. | |
113 public: | |
114 // Committed area | |
115 char* low() const { return committed_low_addr(); } | |
116 char* high() const { return committed_high_addr(); } | |
117 | |
118 // Reserved area | |
119 char* low_boundary() const { return reserved_low_addr(); } | |
120 char* high_boundary() const { return reserved_high_addr(); } | |
121 }; | |
122 | |
123 // A virtual space that grows from high addresses to low addresses. | |
124 class PSVirtualSpaceHighToLow : public PSVirtualSpace { | |
125 friend class VMStructs; | |
126 public: | |
127 PSVirtualSpaceHighToLow(ReservedSpace rs, size_t alignment); | |
128 PSVirtualSpaceHighToLow(ReservedSpace rs); | |
129 | |
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130 virtual bool expand_by(size_t bytes); |
0 | 131 virtual bool shrink_by(size_t bytes); |
132 virtual size_t expand_into(PSVirtualSpace* space, size_t bytes); | |
133 | |
134 virtual void print_space_boundaries_on(outputStream* st) const; | |
135 | |
136 #ifndef PRODUCT | |
137 // Debugging | |
138 virtual bool grows_up() const { return false; } | |
139 #endif | |
140 }; | |
141 | |
142 // | |
143 // PSVirtualSpace inlines. | |
144 // | |
145 inline size_t | |
146 PSVirtualSpace::pointer_delta(const char* left, const char* right) { | |
147 return ::pointer_delta((void *)left, (void*)right, sizeof(char)); | |
148 } | |
149 | |
150 inline size_t PSVirtualSpace::committed_size() const { | |
151 return pointer_delta(committed_high_addr(), committed_low_addr()); | |
152 } | |
153 | |
154 inline size_t PSVirtualSpace::reserved_size() const { | |
155 return pointer_delta(reserved_high_addr(), reserved_low_addr()); | |
156 } | |
157 | |
158 inline size_t PSVirtualSpace::uncommitted_size() const { | |
159 return reserved_size() - committed_size(); | |
160 } | |
161 | |
162 inline void PSVirtualSpace::set_reserved(char* low_addr, char* high_addr, bool special) { | |
163 _reserved_low_addr = low_addr; | |
164 _reserved_high_addr = high_addr; | |
165 _special = special; | |
166 } | |
167 | |
168 inline void PSVirtualSpace::set_reserved(ReservedSpace rs) { | |
169 set_reserved(rs.base(), rs.base() + rs.size(), rs.special()); | |
170 } | |
171 | |
172 inline void PSVirtualSpace::set_committed(char* low_addr, char* high_addr) { | |
173 _committed_low_addr = low_addr; | |
174 _committed_high_addr = high_addr; | |
175 } |