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annotate src/share/vm/gc_implementation/parallelScavenge/psVirtualspace.hpp @ 21598:05ecef0a6a24
LinearScanLifetimeAnalysisPhase: special case StackStoreOp.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Thu, 28 May 2015 13:07:25 +0200 |
parents | 4ca6dc0799b6 |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2012, 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_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSVIRTUALSPACE_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSVIRTUALSPACE_HPP | |
27 | |
28 #include "runtime/virtualspace.hpp" | |
29 | |
0 | 30 // VirtualSpace for the parallel scavenge collector. |
31 // | |
32 // VirtualSpace is data structure for committing a previously reserved address | |
33 // range in smaller chunks. | |
34 | |
6197 | 35 class PSVirtualSpace : public CHeapObj<mtGC> { |
0 | 36 friend class VMStructs; |
37 protected: | |
14909 | 38 // The space is committed/uncommited in chunks of size _alignment. The |
0 | 39 // ReservedSpace passed to initialize() must be aligned to this value. |
40 const size_t _alignment; | |
41 | |
42 // Reserved area | |
43 char* _reserved_low_addr; | |
44 char* _reserved_high_addr; | |
45 | |
46 // Committed area | |
47 char* _committed_low_addr; | |
48 char* _committed_high_addr; | |
49 | |
50 // The entire space has been committed and pinned in memory, no | |
51 // os::commit_memory() or os::uncommit_memory(). | |
52 bool _special; | |
53 | |
54 // Convenience wrapper. | |
55 inline static size_t pointer_delta(const char* left, const char* right); | |
56 | |
57 public: | |
58 PSVirtualSpace(ReservedSpace rs, size_t alignment); | |
59 PSVirtualSpace(ReservedSpace rs); | |
60 | |
61 ~PSVirtualSpace(); | |
62 | |
63 // Eventually all instances should be created with the above 1- or 2-arg | |
64 // constructors. Then the 1st constructor below should become protected and | |
65 // the 2nd ctor and initialize() removed. | |
66 PSVirtualSpace(size_t alignment): _alignment(alignment) { } | |
67 PSVirtualSpace(); | |
68 bool initialize(ReservedSpace rs, size_t commit_size); | |
69 | |
70 bool contains(void* p) const; | |
71 | |
72 // Accessors (all sizes are bytes). | |
73 size_t alignment() const { return _alignment; } | |
74 char* reserved_low_addr() const { return _reserved_low_addr; } | |
75 char* reserved_high_addr() const { return _reserved_high_addr; } | |
76 char* committed_low_addr() const { return _committed_low_addr; } | |
77 char* committed_high_addr() const { return _committed_high_addr; } | |
78 bool special() const { return _special; } | |
79 | |
80 inline size_t committed_size() const; | |
81 inline size_t reserved_size() const; | |
82 inline size_t uncommitted_size() const; | |
83 | |
84 // Operations. | |
85 inline void set_reserved(char* low_addr, char* high_addr, bool special); | |
86 inline void set_reserved(ReservedSpace rs); | |
87 inline void set_committed(char* low_addr, char* high_addr); | |
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88 virtual bool expand_by(size_t bytes); |
0 | 89 virtual bool shrink_by(size_t bytes); |
90 virtual size_t expand_into(PSVirtualSpace* space, size_t bytes); | |
91 void release(); | |
92 | |
93 #ifndef PRODUCT | |
94 // Debugging | |
95 static bool is_aligned(size_t val, size_t align); | |
96 bool is_aligned(size_t val) const; | |
97 bool is_aligned(char* val) const; | |
98 void verify() const; | |
99 void print() const; | |
100 virtual bool grows_up() const { return true; } | |
101 bool grows_down() const { return !grows_up(); } | |
102 | |
103 // Helper class to verify a space when entering/leaving a block. | |
104 class PSVirtualSpaceVerifier: public StackObj { | |
105 private: | |
106 const PSVirtualSpace* const _space; | |
107 public: | |
108 PSVirtualSpaceVerifier(PSVirtualSpace* space): _space(space) { | |
109 _space->verify(); | |
110 } | |
111 ~PSVirtualSpaceVerifier() { _space->verify(); } | |
112 }; | |
113 #endif | |
114 | |
115 virtual void print_space_boundaries_on(outputStream* st) const; | |
116 | |
117 // Included for compatibility with the original VirtualSpace. | |
118 public: | |
119 // Committed area | |
120 char* low() const { return committed_low_addr(); } | |
121 char* high() const { return committed_high_addr(); } | |
122 | |
123 // Reserved area | |
124 char* low_boundary() const { return reserved_low_addr(); } | |
125 char* high_boundary() const { return reserved_high_addr(); } | |
126 }; | |
127 | |
128 // A virtual space that grows from high addresses to low addresses. | |
129 class PSVirtualSpaceHighToLow : public PSVirtualSpace { | |
130 friend class VMStructs; | |
131 public: | |
132 PSVirtualSpaceHighToLow(ReservedSpace rs, size_t alignment); | |
133 PSVirtualSpaceHighToLow(ReservedSpace rs); | |
134 | |
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135 virtual bool expand_by(size_t bytes); |
0 | 136 virtual bool shrink_by(size_t bytes); |
137 virtual size_t expand_into(PSVirtualSpace* space, size_t bytes); | |
138 | |
139 virtual void print_space_boundaries_on(outputStream* st) const; | |
140 | |
141 #ifndef PRODUCT | |
142 // Debugging | |
143 virtual bool grows_up() const { return false; } | |
144 #endif | |
145 }; | |
146 | |
147 // | |
148 // PSVirtualSpace inlines. | |
149 // | |
150 inline size_t | |
151 PSVirtualSpace::pointer_delta(const char* left, const char* right) { | |
152 return ::pointer_delta((void *)left, (void*)right, sizeof(char)); | |
153 } | |
154 | |
155 inline size_t PSVirtualSpace::committed_size() const { | |
156 return pointer_delta(committed_high_addr(), committed_low_addr()); | |
157 } | |
158 | |
159 inline size_t PSVirtualSpace::reserved_size() const { | |
160 return pointer_delta(reserved_high_addr(), reserved_low_addr()); | |
161 } | |
162 | |
163 inline size_t PSVirtualSpace::uncommitted_size() const { | |
164 return reserved_size() - committed_size(); | |
165 } | |
166 | |
167 inline void PSVirtualSpace::set_reserved(char* low_addr, char* high_addr, bool special) { | |
168 _reserved_low_addr = low_addr; | |
169 _reserved_high_addr = high_addr; | |
170 _special = special; | |
171 } | |
172 | |
173 inline void PSVirtualSpace::set_reserved(ReservedSpace rs) { | |
174 set_reserved(rs.base(), rs.base() + rs.size(), rs.special()); | |
175 } | |
176 | |
177 inline void PSVirtualSpace::set_committed(char* low_addr, char* high_addr) { | |
178 _committed_low_addr = low_addr; | |
179 _committed_high_addr = high_addr; | |
180 } | |
1972 | 181 |
182 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSVIRTUALSPACE_HPP |