1 /*
2 * Copyright (c) 1997, 2015, 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_RUNTIME_VIRTUALSPACE_HPP
26 #define SHARE_VM_RUNTIME_VIRTUALSPACE_HPP
27
28 #include "memory/allocation.hpp"
29
30 // ReservedSpace is a data structure for reserving a contiguous address range.
31
32 class ReservedSpace VALUE_OBJ_CLASS_SPEC {
33 friend class VMStructs;
34 protected:
35 char* _base;
36 size_t _size;
37 size_t _noaccess_prefix;
38 size_t _alignment;
39 bool _special;
40 private:
41 bool _executable;
42
43 // ReservedSpace
44 ReservedSpace(char* base, size_t size, size_t alignment, bool special,
45 bool executable);
46 protected:
47 void initialize(size_t size, size_t alignment, bool large,
48 char* requested_address,
49 bool executable);
50
51 public:
52 // Constructor
53 ReservedSpace();
54 // Initialize the reserved space with the given size. If preferred_page_size
55 // is set, use this as minimum page size/alignment. This may waste some space
56 // if the given size is not aligned to that value, as the reservation will be
57 // aligned up to the final alignment in this case.
58 ReservedSpace(size_t size, size_t preferred_page_size = 0);
59 ReservedSpace(size_t size, size_t alignment, bool large,
94 }
95
96 ReservedSpace ReservedSpace::last_part(size_t partition_size)
97 {
98 return last_part(partition_size, alignment());
99 }
100
101 // Class encapsulating behavior specific of memory space reserved for Java heap.
102 class ReservedHeapSpace : public ReservedSpace {
103 private:
104 void try_reserve_heap(size_t size, size_t alignment, bool large,
105 char *requested_address);
106 void try_reserve_range(char *highest_start, char *lowest_start,
107 size_t attach_point_alignment, char *aligned_HBMA,
108 char *upper_bound, size_t size, size_t alignment, bool large);
109 void initialize_compressed_heap(const size_t size, size_t alignment, bool large);
110 // Create protection page at the beginning of the space.
111 void establish_noaccess_prefix();
112 public:
113 // Constructor. Tries to find a heap that is good for compressed oops.
114 ReservedHeapSpace(size_t size, size_t forced_base_alignment, bool large);
115 // Returns the base to be used for compression, i.e. so that null can be
116 // encoded safely and implicit null checks can work.
117 char *compressed_oop_base() { return _base - _noaccess_prefix; }
118 };
119
120 // Class encapsulating behavior specific memory space for Code
121 class ReservedCodeSpace : public ReservedSpace {
122 public:
123 // Constructor
124 ReservedCodeSpace(size_t r_size, size_t rs_align, bool large);
125 };
126
127 // VirtualSpace is data structure for committing a previously reserved address range in smaller chunks.
128
129 class VirtualSpace VALUE_OBJ_CLASS_SPEC {
130 friend class VMStructs;
131 private:
132 // Reserved area
133 char* _low_boundary;
134 char* _high_boundary;
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1 /*
2 * Copyright (c) 1997, 2016, 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_RUNTIME_VIRTUALSPACE_HPP
26 #define SHARE_VM_RUNTIME_VIRTUALSPACE_HPP
27
28 #include "memory/allocation.hpp"
29
30 // ReservedSpace is a data structure for reserving a contiguous address range.
31
32 class ReservedSpace VALUE_OBJ_CLASS_SPEC {
33 friend class VMStructs;
34 protected:
35 char* _base;
36 size_t _size;
37 size_t _noaccess_prefix;
38 size_t _alignment;
39 bool _special;
40 int _backing_fd;
41 private:
42 bool _executable;
43
44 // ReservedSpace
45 ReservedSpace(char* base, size_t size, size_t alignment, bool special,
46 bool executable);
47 protected:
48 void initialize(size_t size, size_t alignment, bool large,
49 char* requested_address,
50 bool executable);
51
52 public:
53 // Constructor
54 ReservedSpace();
55 // Initialize the reserved space with the given size. If preferred_page_size
56 // is set, use this as minimum page size/alignment. This may waste some space
57 // if the given size is not aligned to that value, as the reservation will be
58 // aligned up to the final alignment in this case.
59 ReservedSpace(size_t size, size_t preferred_page_size = 0);
60 ReservedSpace(size_t size, size_t alignment, bool large,
95 }
96
97 ReservedSpace ReservedSpace::last_part(size_t partition_size)
98 {
99 return last_part(partition_size, alignment());
100 }
101
102 // Class encapsulating behavior specific of memory space reserved for Java heap.
103 class ReservedHeapSpace : public ReservedSpace {
104 private:
105 void try_reserve_heap(size_t size, size_t alignment, bool large,
106 char *requested_address);
107 void try_reserve_range(char *highest_start, char *lowest_start,
108 size_t attach_point_alignment, char *aligned_HBMA,
109 char *upper_bound, size_t size, size_t alignment, bool large);
110 void initialize_compressed_heap(const size_t size, size_t alignment, bool large);
111 // Create protection page at the beginning of the space.
112 void establish_noaccess_prefix();
113 public:
114 // Constructor. Tries to find a heap that is good for compressed oops.
115 ReservedHeapSpace(size_t size, size_t forced_base_alignment, bool large, const char* backingFSforHeap = NULL);
116 // Returns the base to be used for compression, i.e. so that null can be
117 // encoded safely and implicit null checks can work.
118 char *compressed_oop_base() { return _base - _noaccess_prefix; }
119 };
120
121 // Class encapsulating behavior specific memory space for Code
122 class ReservedCodeSpace : public ReservedSpace {
123 public:
124 // Constructor
125 ReservedCodeSpace(size_t r_size, size_t rs_align, bool large);
126 };
127
128 // VirtualSpace is data structure for committing a previously reserved address range in smaller chunks.
129
130 class VirtualSpace VALUE_OBJ_CLASS_SPEC {
131 friend class VMStructs;
132 private:
133 // Reserved area
134 char* _low_boundary;
135 char* _high_boundary;
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