Mercurial > hg > graal-compiler

comparison src/share/vm/gc_implementation/parallelScavenge/psVirtualspace.hpp @ 0:a61af66fc99e jdk7-b24

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Initial load
author duke
date Sat, 01 Dec 2007 00:00:00 +0000
parents
children 4e400c36026f
comparison
equal deleted inserted replaced
-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2003-2005 Sun Microsystems, Inc. All Rights Reserved.
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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
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);
83 virtual bool expand_by(size_t bytes, bool pre_touch = false);
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
130 virtual bool expand_by(size_t bytes, bool pre_touch = false);
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 }