1 /*
2 * Copyright (c) 1997, 2006, Oracle and/or its affiliates. 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 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
25 // Blocks
26
27 class HeapBlock VALUE_OBJ_CLASS_SPEC {
28 friend class VMStructs;
29
30 public:
31 struct Header {
32 size_t _length; // the length in segments
33 bool _used; // Used bit
34 };
35
36 protected:
37 union {
38 Header _header;
39 int64_t _padding[ (sizeof(Header) + sizeof(int64_t)-1) / sizeof(int64_t) ];
40 // pad to 0 mod 8
41 };
42
43 public:
44 // Initialization
142 char *low_boundary() const { return _memory.low_boundary (); }
143 char *high_boundary() const { return _memory.high_boundary(); }
144
145 // Iteration
146
147 // returns the first block or NULL
148 void* first() const { return next_free(first_block()); }
149 // returns the next block given a block p or NULL
150 void* next(void* p) const { return next_free(next_block(block_start(p))); }
151
152 // Statistics
153 size_t capacity() const;
154 size_t max_capacity() const;
155 size_t allocated_capacity() const;
156 size_t unallocated_capacity() const { return max_capacity() - allocated_capacity(); }
157
158 // Debugging
159 void verify();
160 void print() PRODUCT_RETURN;
161 };
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1 /*
2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. 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 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
25 #ifndef SHARE_VM_MEMORY_HEAP_HPP
26 #define SHARE_VM_MEMORY_HEAP_HPP
27
28 #include "memory/allocation.hpp"
29 #include "runtime/virtualspace.hpp"
30
31 // Blocks
32
33 class HeapBlock VALUE_OBJ_CLASS_SPEC {
34 friend class VMStructs;
35
36 public:
37 struct Header {
38 size_t _length; // the length in segments
39 bool _used; // Used bit
40 };
41
42 protected:
43 union {
44 Header _header;
45 int64_t _padding[ (sizeof(Header) + sizeof(int64_t)-1) / sizeof(int64_t) ];
46 // pad to 0 mod 8
47 };
48
49 public:
50 // Initialization
148 char *low_boundary() const { return _memory.low_boundary (); }
149 char *high_boundary() const { return _memory.high_boundary(); }
150
151 // Iteration
152
153 // returns the first block or NULL
154 void* first() const { return next_free(first_block()); }
155 // returns the next block given a block p or NULL
156 void* next(void* p) const { return next_free(next_block(block_start(p))); }
157
158 // Statistics
159 size_t capacity() const;
160 size_t max_capacity() const;
161 size_t allocated_capacity() const;
162 size_t unallocated_capacity() const { return max_capacity() - allocated_capacity(); }
163
164 // Debugging
165 void verify();
166 void print() PRODUCT_RETURN;
167 };
168
169 #endif // SHARE_VM_MEMORY_HEAP_HPP
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