Thu, 27 Feb 2020 05:40:59 +0000
8187078: -XX:+VerifyOops finds numerous problems when running JPRT
Reviewed-by: andrew
1 /*
2 * Copyright (c) 1997, 2013, 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 */
25 #ifndef SHARE_VM_RUNTIME_VIRTUALSPACE_HPP
26 #define SHARE_VM_RUNTIME_VIRTUALSPACE_HPP
28 #include "memory/allocation.hpp"
30 // ReservedSpace is a data structure for reserving a contiguous address range.
32 class ReservedSpace VALUE_OBJ_CLASS_SPEC {
33 friend class VMStructs;
34 private:
35 char* _base;
36 size_t _size;
37 size_t _noaccess_prefix;
38 size_t _alignment;
39 bool _special;
40 bool _executable;
42 // ReservedSpace
43 ReservedSpace(char* base, size_t size, size_t alignment, bool special,
44 bool executable);
45 void initialize(size_t size, size_t alignment, bool large,
46 char* requested_address,
47 const size_t noaccess_prefix,
48 bool executable);
50 protected:
51 // Create protection page at the beginning of the space.
52 void protect_noaccess_prefix(const size_t size);
54 public:
55 // Constructor
56 ReservedSpace();
57 // Initialize the reserved space with the given size. If preferred_page_size
58 // is set, use this as minimum page size/alignment. This may waste some space
59 // if the given size is not aligned to that value, as the reservation will be
60 // aligned up to the final alignment in this case.
61 ReservedSpace(size_t size, size_t preferred_page_size = 0);
62 ReservedSpace(size_t size, size_t alignment, bool large,
63 char* requested_address = NULL,
64 const size_t noaccess_prefix = 0);
65 ReservedSpace(size_t size, size_t alignment, bool large, bool executable);
67 // Accessors
68 char* base() const { return _base; }
69 size_t size() const { return _size; }
70 size_t alignment() const { return _alignment; }
71 bool special() const { return _special; }
72 bool executable() const { return _executable; }
73 size_t noaccess_prefix() const { return _noaccess_prefix; }
74 bool is_reserved() const { return _base != NULL; }
75 void release();
77 // Splitting
78 ReservedSpace first_part(size_t partition_size, size_t alignment,
79 bool split = false, bool realloc = true);
80 ReservedSpace last_part (size_t partition_size, size_t alignment);
82 // These simply call the above using the default alignment.
83 inline ReservedSpace first_part(size_t partition_size,
84 bool split = false, bool realloc = true);
85 inline ReservedSpace last_part (size_t partition_size);
87 // Alignment
88 static size_t page_align_size_up(size_t size);
89 static size_t page_align_size_down(size_t size);
90 static size_t allocation_align_size_up(size_t size);
91 static size_t allocation_align_size_down(size_t size);
92 };
94 ReservedSpace
95 ReservedSpace::first_part(size_t partition_size, bool split, bool realloc)
96 {
97 return first_part(partition_size, alignment(), split, realloc);
98 }
100 ReservedSpace ReservedSpace::last_part(size_t partition_size)
101 {
102 return last_part(partition_size, alignment());
103 }
105 // Class encapsulating behavior specific of memory space reserved for Java heap
106 class ReservedHeapSpace : public ReservedSpace {
107 public:
108 // Constructor
109 ReservedHeapSpace(size_t size, size_t forced_base_alignment,
110 bool large, char* requested_address);
111 };
113 // Class encapsulating behavior specific memory space for Code
114 class ReservedCodeSpace : public ReservedSpace {
115 public:
116 // Constructor
117 ReservedCodeSpace(size_t r_size, size_t rs_align, bool large);
118 };
120 // VirtualSpace is data structure for committing a previously reserved address range in smaller chunks.
122 class VirtualSpace VALUE_OBJ_CLASS_SPEC {
123 friend class VMStructs;
124 private:
125 // Reserved area
126 char* _low_boundary;
127 char* _high_boundary;
129 // Committed area
130 char* _low;
131 char* _high;
133 // The entire space has been committed and pinned in memory, no
134 // os::commit_memory() or os::uncommit_memory().
135 bool _special;
137 // Need to know if commit should be executable.
138 bool _executable;
140 // MPSS Support
141 // Each virtualspace region has a lower, middle, and upper region.
142 // Each region has an end boundary and a high pointer which is the
143 // high water mark for the last allocated byte.
144 // The lower and upper unaligned to LargePageSizeInBytes uses default page.
145 // size. The middle region uses large page size.
146 char* _lower_high;
147 char* _middle_high;
148 char* _upper_high;
150 char* _lower_high_boundary;
151 char* _middle_high_boundary;
152 char* _upper_high_boundary;
154 size_t _lower_alignment;
155 size_t _middle_alignment;
156 size_t _upper_alignment;
158 // MPSS Accessors
159 char* lower_high() const { return _lower_high; }
160 char* middle_high() const { return _middle_high; }
161 char* upper_high() const { return _upper_high; }
163 char* lower_high_boundary() const { return _lower_high_boundary; }
164 char* middle_high_boundary() const { return _middle_high_boundary; }
165 char* upper_high_boundary() const { return _upper_high_boundary; }
167 size_t lower_alignment() const { return _lower_alignment; }
168 size_t middle_alignment() const { return _middle_alignment; }
169 size_t upper_alignment() const { return _upper_alignment; }
171 public:
172 // Committed area
173 char* low() const { return _low; }
174 char* high() const { return _high; }
176 // Reserved area
177 char* low_boundary() const { return _low_boundary; }
178 char* high_boundary() const { return _high_boundary; }
180 bool special() const { return _special; }
182 public:
183 // Initialization
184 VirtualSpace();
185 bool initialize_with_granularity(ReservedSpace rs, size_t committed_byte_size, size_t max_commit_ganularity);
186 bool initialize(ReservedSpace rs, size_t committed_byte_size);
188 // Destruction
189 ~VirtualSpace();
191 // Reserved memory
192 size_t reserved_size() const;
193 // Actually committed OS memory
194 size_t actual_committed_size() const;
195 // Memory used/expanded in this virtual space
196 size_t committed_size() const;
197 // Memory left to use/expand in this virtual space
198 size_t uncommitted_size() const;
200 bool contains(const void* p) const;
202 // Operations
203 // returns true on success, false otherwise
204 bool expand_by(size_t bytes, bool pre_touch = false);
205 void shrink_by(size_t bytes);
206 void release();
208 void check_for_contiguity() PRODUCT_RETURN;
210 // Debugging
211 void print_on(outputStream* out) PRODUCT_RETURN;
212 void print();
213 };
215 #endif // SHARE_VM_RUNTIME_VIRTUALSPACE_HPP