1 /*
2 * Copyright (c) 2003, 2009, 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 #include "incls/_precompiled.incl"
26 #include "incls/_psVirtualspace.cpp.incl"
27
28 // PSVirtualSpace
29
30 PSVirtualSpace::PSVirtualSpace(ReservedSpace rs, size_t alignment) :
31 _alignment(alignment)
32 {
33 set_reserved(rs);
34 set_committed(reserved_low_addr(), reserved_low_addr());
35 DEBUG_ONLY(verify());
36 }
37
38 PSVirtualSpace::PSVirtualSpace(ReservedSpace rs) :
39 _alignment(os::vm_page_size())
40 {
41 set_reserved(rs);
42 set_committed(reserved_low_addr(), reserved_low_addr());
43 DEBUG_ONLY(verify());
44 }
45
46 // Deprecated.
47 PSVirtualSpace::PSVirtualSpace(): _alignment(os::vm_page_size()) {
48 }
49
50 // Deprecated.
51 bool PSVirtualSpace::initialize(ReservedSpace rs,
52 size_t commit_size) {
53 set_reserved(rs);
54 set_committed(reserved_low_addr(), reserved_low_addr());
55
56 // Commit to initial size.
57 assert(commit_size <= rs.size(), "commit_size too big");
58 bool result = commit_size > 0 ? expand_by(commit_size) : true;
59 DEBUG_ONLY(verify());
60 return result;
61 }
62
63 PSVirtualSpace::~PSVirtualSpace() {
64 release();
65 }
66
67 bool PSVirtualSpace::contains(void* p) const {
68 char* const cp = (char*)p;
69 return cp >= committed_low_addr() && cp < committed_high_addr();
70 }
71
72 void PSVirtualSpace::release() {
73 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
74 // This may not release memory it didn't reserve.
75 // Use rs.release() to release the underlying memory instead.
76 _reserved_low_addr = _reserved_high_addr = NULL;
77 _committed_low_addr = _committed_high_addr = NULL;
78 _special = false;
79 }
80
81 bool PSVirtualSpace::expand_by(size_t bytes) {
82 assert(is_aligned(bytes), "arg not aligned");
83 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
84
85 if (uncommitted_size() < bytes) {
86 return false;
87 }
88
89 char* const base_addr = committed_high_addr();
90 bool result = special() || os::commit_memory(base_addr, bytes, alignment());
91 if (result) {
92 _committed_high_addr += bytes;
93 }
94
95 return result;
96 }
97
98 bool PSVirtualSpace::shrink_by(size_t bytes) {
99 assert(is_aligned(bytes), "arg not aligned");
100 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
101
102 if (committed_size() < bytes) {
103 return false;
104 }
105
106 char* const base_addr = committed_high_addr() - bytes;
107 bool result = special() || os::uncommit_memory(base_addr, bytes);
108 if (result) {
109 _committed_high_addr -= bytes;
110 }
111
112 return result;
113 }
114
115 size_t
116 PSVirtualSpace::expand_into(PSVirtualSpace* other_space, size_t bytes) {
117 assert(is_aligned(bytes), "arg not aligned");
118 assert(grows_up(), "this space must grow up");
119 assert(other_space->grows_down(), "other space must grow down");
120 assert(reserved_high_addr() == other_space->reserved_low_addr(),
121 "spaces not contiguous");
122 assert(special() == other_space->special(), "one space is special, the other is not");
123 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
124 DEBUG_ONLY(PSVirtualSpaceVerifier other_verifier(other_space));
125
126 size_t bytes_needed = bytes;
127
128 // First use the uncommitted region in this space.
129 size_t tmp_bytes = MIN2(uncommitted_size(), bytes_needed);
130 if (tmp_bytes > 0) {
131 if (expand_by(tmp_bytes)) {
132 bytes_needed -= tmp_bytes;
133 } else {
134 return 0;
135 }
136 }
137
138 // Next take from the uncommitted region in the other space, and commit it.
139 tmp_bytes = MIN2(other_space->uncommitted_size(), bytes_needed);
140 if (tmp_bytes > 0) {
141 char* const commit_base = committed_high_addr();
142 if (other_space->special() ||
143 os::commit_memory(commit_base, tmp_bytes, alignment())) {
144 // Reduce the reserved region in the other space.
145 other_space->set_reserved(other_space->reserved_low_addr() + tmp_bytes,
146 other_space->reserved_high_addr(),
147 other_space->special());
148
149 // Grow both reserved and committed in this space.
150 _reserved_high_addr += tmp_bytes;
151 _committed_high_addr += tmp_bytes;
152 bytes_needed -= tmp_bytes;
153 } else {
154 return bytes - bytes_needed;
155 }
156 }
157
158 // Finally take from the already committed region in the other space.
159 tmp_bytes = bytes_needed;
160 if (tmp_bytes > 0) {
161 // Reduce both committed and reserved in the other space.
162 other_space->set_committed(other_space->committed_low_addr() + tmp_bytes,
163 other_space->committed_high_addr());
164 other_space->set_reserved(other_space->reserved_low_addr() + tmp_bytes,
165 other_space->reserved_high_addr(),
166 other_space->special());
167
168 // Grow both reserved and committed in this space.
169 _reserved_high_addr += tmp_bytes;
170 _committed_high_addr += tmp_bytes;
171 }
172
173 return bytes;
174 }
175
176 #ifndef PRODUCT
177 bool PSVirtualSpace::is_aligned(size_t value, size_t align) {
178 const size_t tmp_value = value + align - 1;
179 const size_t mask = ~(align - 1);
180 return (tmp_value & mask) == value;
181 }
182
183 bool PSVirtualSpace::is_aligned(size_t value) const {
184 return is_aligned(value, alignment());
185 }
186
187 bool PSVirtualSpace::is_aligned(char* value) const {
188 return is_aligned((size_t)value);
189 }
190
191 void PSVirtualSpace::verify() const {
192 assert(is_aligned(alignment(), os::vm_page_size()), "bad alignment");
193 assert(is_aligned(reserved_low_addr()), "bad reserved_low_addr");
194 assert(is_aligned(reserved_high_addr()), "bad reserved_high_addr");
195 assert(is_aligned(committed_low_addr()), "bad committed_low_addr");
196 assert(is_aligned(committed_high_addr()), "bad committed_high_addr");
197
198 // Reserved region must be non-empty or both addrs must be 0.
199 assert(reserved_low_addr() < reserved_high_addr() ||
200 reserved_low_addr() == NULL && reserved_high_addr() == NULL,
201 "bad reserved addrs");
202 assert(committed_low_addr() <= committed_high_addr(), "bad committed addrs");
203
204 if (grows_up()) {
205 assert(reserved_low_addr() == committed_low_addr(), "bad low addrs");
206 assert(reserved_high_addr() >= committed_high_addr(), "bad high addrs");
207 } else {
208 assert(reserved_high_addr() == committed_high_addr(), "bad high addrs");
209 assert(reserved_low_addr() <= committed_low_addr(), "bad low addrs");
210 }
211 }
212
213 void PSVirtualSpace::print() const {
214 gclog_or_tty->print_cr("virtual space [" PTR_FORMAT "]: alignment="
215 SIZE_FORMAT "K grows %s%s",
216 this, alignment() / K, grows_up() ? "up" : "down",
217 special() ? " (pinned in memory)" : "");
218 gclog_or_tty->print_cr(" reserved=" SIZE_FORMAT "K"
219 " [" PTR_FORMAT "," PTR_FORMAT "]"
220 " committed=" SIZE_FORMAT "K"
221 " [" PTR_FORMAT "," PTR_FORMAT "]",
222 reserved_size() / K,
223 reserved_low_addr(), reserved_high_addr(),
224 committed_size() / K,
225 committed_low_addr(), committed_high_addr());
226 }
227 #endif // #ifndef PRODUCT
228
229 void PSVirtualSpace::print_space_boundaries_on(outputStream* st) const {
230 st->print_cr(" [" PTR_FORMAT ", " PTR_FORMAT ", " PTR_FORMAT ")",
231 low_boundary(), high(), high_boundary());
232 }
233
234 PSVirtualSpaceHighToLow::PSVirtualSpaceHighToLow(ReservedSpace rs,
235 size_t alignment) :
236 PSVirtualSpace(alignment)
237 {
238 set_reserved(rs);
239 set_committed(reserved_high_addr(), reserved_high_addr());
240 DEBUG_ONLY(verify());
241 }
242
243 PSVirtualSpaceHighToLow::PSVirtualSpaceHighToLow(ReservedSpace rs) {
244 set_reserved(rs);
245 set_committed(reserved_high_addr(), reserved_high_addr());
246 DEBUG_ONLY(verify());
247 }
248
249 bool PSVirtualSpaceHighToLow::expand_by(size_t bytes) {
250 assert(is_aligned(bytes), "arg not aligned");
251 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
252
253 if (uncommitted_size() < bytes) {
254 return false;
255 }
256
257 char* const base_addr = committed_low_addr() - bytes;
258 bool result = special() || os::commit_memory(base_addr, bytes, alignment());
259 if (result) {
260 _committed_low_addr -= bytes;
261 }
262
263 return result;
264 }
265
266 bool PSVirtualSpaceHighToLow::shrink_by(size_t bytes) {
267 assert(is_aligned(bytes), "arg not aligned");
268 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
269
270 if (committed_size() < bytes) {
271 return false;
272 }
273
274 char* const base_addr = committed_low_addr();
275 bool result = special() || os::uncommit_memory(base_addr, bytes);
276 if (result) {
277 _committed_low_addr += bytes;
278 }
279
280 return result;
281 }
282
283 size_t PSVirtualSpaceHighToLow::expand_into(PSVirtualSpace* other_space,
284 size_t bytes) {
285 assert(is_aligned(bytes), "arg not aligned");
286 assert(grows_down(), "this space must grow down");
287 assert(other_space->grows_up(), "other space must grow up");
288 assert(reserved_low_addr() == other_space->reserved_high_addr(),
289 "spaces not contiguous");
290 assert(special() == other_space->special(), "one space is special in memory, the other is not");
291 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
292 DEBUG_ONLY(PSVirtualSpaceVerifier other_verifier(other_space));
293
294 size_t bytes_needed = bytes;
295
296 // First use the uncommitted region in this space.
297 size_t tmp_bytes = MIN2(uncommitted_size(), bytes_needed);
298 if (tmp_bytes > 0) {
299 if (expand_by(tmp_bytes)) {
300 bytes_needed -= tmp_bytes;
301 } else {
302 return 0;
303 }
304 }
305
306 // Next take from the uncommitted region in the other space, and commit it.
307 tmp_bytes = MIN2(other_space->uncommitted_size(), bytes_needed);
308 if (tmp_bytes > 0) {
309 char* const commit_base = committed_low_addr() - tmp_bytes;
310 if (other_space->special() ||
311 os::commit_memory(commit_base, tmp_bytes, alignment())) {
312 // Reduce the reserved region in the other space.
313 other_space->set_reserved(other_space->reserved_low_addr(),
314 other_space->reserved_high_addr() - tmp_bytes,
315 other_space->special());
316
317 // Grow both reserved and committed in this space.
318 _reserved_low_addr -= tmp_bytes;
319 _committed_low_addr -= tmp_bytes;
320 bytes_needed -= tmp_bytes;
321 } else {
322 return bytes - bytes_needed;
323 }
324 }
325
326 // Finally take from the already committed region in the other space.
327 tmp_bytes = bytes_needed;
328 if (tmp_bytes > 0) {
329 // Reduce both committed and reserved in the other space.
330 other_space->set_committed(other_space->committed_low_addr(),
331 other_space->committed_high_addr() - tmp_bytes);
332 other_space->set_reserved(other_space->reserved_low_addr(),
333 other_space->reserved_high_addr() - tmp_bytes,
334 other_space->special());
335
336 // Grow both reserved and committed in this space.
337 _reserved_low_addr -= tmp_bytes;
338 _committed_low_addr -= tmp_bytes;
339 }
340
341 return bytes;
342 }
343
344 void
345 PSVirtualSpaceHighToLow::print_space_boundaries_on(outputStream* st) const {
346 st->print_cr(" (" PTR_FORMAT ", " PTR_FORMAT ", " PTR_FORMAT "]",
347 high_boundary(), low(), low_boundary());
348 }