1836
|
1 /*
|
|
2 * Copyright 2009 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 StackBase::StackBase(size_t segment_size, size_t max_cache_size,
|
|
26 size_t max_size):
|
|
27 _seg_size(segment_size),
|
|
28 _max_cache_size(max_cache_size),
|
|
29 _max_size(adjust_max_size(max_size, segment_size))
|
|
30 {
|
|
31 assert(_max_size % _seg_size == 0, "not a multiple");
|
|
32 }
|
|
33
|
|
34 size_t StackBase::adjust_max_size(size_t max_size, size_t seg_size)
|
|
35 {
|
|
36 assert(seg_size > 0, "cannot be 0");
|
|
37 assert(max_size >= seg_size || max_size == 0, "max_size too small");
|
|
38 const size_t limit = max_uintx - (seg_size - 1);
|
|
39 if (max_size == 0 || max_size > limit) {
|
|
40 max_size = limit;
|
|
41 }
|
|
42 return (max_size + seg_size - 1) / seg_size * seg_size;
|
|
43 }
|
|
44
|
|
45 template <class E>
|
|
46 Stack<E>::Stack(size_t segment_size, size_t max_cache_size, size_t max_size):
|
|
47 StackBase(adjust_segment_size(segment_size), max_cache_size, max_size)
|
|
48 {
|
|
49 reset(true);
|
|
50 }
|
|
51
|
|
52 template <class E>
|
|
53 void Stack<E>::push(E item)
|
|
54 {
|
|
55 assert(!is_full(), "pushing onto a full stack");
|
|
56 if (_cur_seg_size == _seg_size) {
|
|
57 push_segment();
|
|
58 }
|
|
59 _cur_seg[_cur_seg_size] = item;
|
|
60 ++_cur_seg_size;
|
|
61 }
|
|
62
|
|
63 template <class E>
|
|
64 E Stack<E>::pop()
|
|
65 {
|
|
66 assert(!is_empty(), "popping from an empty stack");
|
|
67 if (_cur_seg_size == 1) {
|
|
68 E tmp = _cur_seg[--_cur_seg_size];
|
|
69 pop_segment();
|
|
70 return tmp;
|
|
71 }
|
|
72 return _cur_seg[--_cur_seg_size];
|
|
73 }
|
|
74
|
|
75 template <class E>
|
|
76 void Stack<E>::clear(bool clear_cache)
|
|
77 {
|
|
78 free_segments(_cur_seg);
|
|
79 if (clear_cache) free_segments(_cache);
|
|
80 reset(clear_cache);
|
|
81 }
|
|
82
|
|
83 template <class E>
|
|
84 size_t Stack<E>::default_segment_size()
|
|
85 {
|
|
86 // Number of elements that fit in 4K bytes minus the size of two pointers
|
|
87 // (link field and malloc header).
|
|
88 return (4096 - 2 * sizeof(E*)) / sizeof(E);
|
|
89 }
|
|
90
|
|
91 template <class E>
|
|
92 size_t Stack<E>::adjust_segment_size(size_t seg_size)
|
|
93 {
|
|
94 const size_t elem_sz = sizeof(E);
|
|
95 const size_t ptr_sz = sizeof(E*);
|
|
96 assert(elem_sz % ptr_sz == 0 || ptr_sz % elem_sz == 0, "bad element size");
|
|
97 if (elem_sz < ptr_sz) {
|
|
98 return align_size_up(seg_size * elem_sz, ptr_sz) / elem_sz;
|
|
99 }
|
|
100 return seg_size;
|
|
101 }
|
|
102
|
|
103 template <class E>
|
|
104 size_t Stack<E>::link_offset() const
|
|
105 {
|
|
106 return align_size_up(_seg_size * sizeof(E), sizeof(E*));
|
|
107 }
|
|
108
|
|
109 template <class E>
|
|
110 size_t Stack<E>::segment_bytes() const
|
|
111 {
|
|
112 return link_offset() + sizeof(E*);
|
|
113 }
|
|
114
|
|
115 template <class E>
|
|
116 E** Stack<E>::link_addr(E* seg) const
|
|
117 {
|
|
118 return (E**) ((char*)seg + link_offset());
|
|
119 }
|
|
120
|
|
121 template <class E>
|
|
122 E* Stack<E>::get_link(E* seg) const
|
|
123 {
|
|
124 return *link_addr(seg);
|
|
125 }
|
|
126
|
|
127 template <class E>
|
|
128 E* Stack<E>::set_link(E* new_seg, E* old_seg)
|
|
129 {
|
|
130 *link_addr(new_seg) = old_seg;
|
|
131 return new_seg;
|
|
132 }
|
|
133
|
|
134 template <class E>
|
|
135 E* Stack<E>::alloc(size_t bytes)
|
|
136 {
|
|
137 return (E*) NEW_C_HEAP_ARRAY(char, bytes);
|
|
138 }
|
|
139
|
|
140 template <class E>
|
|
141 void Stack<E>::free(E* addr, size_t bytes)
|
|
142 {
|
|
143 FREE_C_HEAP_ARRAY(char, (char*) addr);
|
|
144 }
|
|
145
|
|
146 template <class E>
|
|
147 void Stack<E>::push_segment()
|
|
148 {
|
|
149 assert(_cur_seg_size == _seg_size, "current segment is not full");
|
|
150 E* next;
|
|
151 if (_cache_size > 0) {
|
|
152 // Use a cached segment.
|
|
153 next = _cache;
|
|
154 _cache = get_link(_cache);
|
|
155 --_cache_size;
|
|
156 } else {
|
|
157 next = alloc(segment_bytes());
|
|
158 DEBUG_ONLY(zap_segment(next, true);)
|
|
159 }
|
|
160 const bool at_empty_transition = is_empty();
|
|
161 _cur_seg = set_link(next, _cur_seg);
|
|
162 _cur_seg_size = 0;
|
|
163 _full_seg_size += at_empty_transition ? 0 : _seg_size;
|
|
164 DEBUG_ONLY(verify(at_empty_transition);)
|
|
165 }
|
|
166
|
|
167 template <class E>
|
|
168 void Stack<E>::pop_segment()
|
|
169 {
|
|
170 assert(_cur_seg_size == 0, "current segment is not empty");
|
|
171 E* const prev = get_link(_cur_seg);
|
|
172 if (_cache_size < _max_cache_size) {
|
|
173 // Add the current segment to the cache.
|
|
174 DEBUG_ONLY(zap_segment(_cur_seg, false);)
|
|
175 _cache = set_link(_cur_seg, _cache);
|
|
176 ++_cache_size;
|
|
177 } else {
|
|
178 DEBUG_ONLY(zap_segment(_cur_seg, true);)
|
|
179 free(_cur_seg, segment_bytes());
|
|
180 }
|
|
181 const bool at_empty_transition = prev == NULL;
|
|
182 _cur_seg = prev;
|
|
183 _cur_seg_size = _seg_size;
|
|
184 _full_seg_size -= at_empty_transition ? 0 : _seg_size;
|
|
185 DEBUG_ONLY(verify(at_empty_transition);)
|
|
186 }
|
|
187
|
|
188 template <class E>
|
|
189 void Stack<E>::free_segments(E* seg)
|
|
190 {
|
|
191 const size_t bytes = segment_bytes();
|
|
192 while (seg != NULL) {
|
|
193 E* const prev = get_link(seg);
|
|
194 free(seg, bytes);
|
|
195 seg = prev;
|
|
196 }
|
|
197 }
|
|
198
|
|
199 template <class E>
|
|
200 void Stack<E>::reset(bool reset_cache)
|
|
201 {
|
|
202 _cur_seg_size = _seg_size; // So push() will alloc a new segment.
|
|
203 _full_seg_size = 0;
|
|
204 _cur_seg = NULL;
|
|
205 if (reset_cache) {
|
|
206 _cache_size = 0;
|
|
207 _cache = NULL;
|
|
208 }
|
|
209 }
|
|
210
|
|
211 #ifdef ASSERT
|
|
212 template <class E>
|
|
213 void Stack<E>::verify(bool at_empty_transition) const
|
|
214 {
|
|
215 assert(size() <= max_size(), "stack exceeded bounds");
|
|
216 assert(cache_size() <= max_cache_size(), "cache exceeded bounds");
|
|
217 assert(_cur_seg_size <= segment_size(), "segment index exceeded bounds");
|
|
218
|
|
219 assert(_full_seg_size % _seg_size == 0, "not a multiple");
|
|
220 assert(at_empty_transition || is_empty() == (size() == 0), "mismatch");
|
|
221 assert((_cache == NULL) == (cache_size() == 0), "mismatch");
|
|
222
|
|
223 if (is_empty()) {
|
|
224 assert(_cur_seg_size == segment_size(), "sanity");
|
|
225 }
|
|
226 }
|
|
227
|
|
228 template <class E>
|
|
229 void Stack<E>::zap_segment(E* seg, bool zap_link_field) const
|
|
230 {
|
|
231 if (!ZapStackSegments) return;
|
|
232 const size_t zap_bytes = segment_bytes() - (zap_link_field ? 0 : sizeof(E*));
|
|
233 uint32_t* cur = (uint32_t*)seg;
|
|
234 const uint32_t* end = cur + zap_bytes / sizeof(uint32_t);
|
|
235 while (cur < end) {
|
|
236 *cur++ = 0xfadfaded;
|
|
237 }
|
|
238 }
|
|
239 #endif
|
|
240
|
|
241 template <class E>
|
|
242 E* ResourceStack<E>::alloc(size_t bytes)
|
|
243 {
|
|
244 return (E*) resource_allocate_bytes(bytes);
|
|
245 }
|
|
246
|
|
247 template <class E>
|
|
248 void ResourceStack<E>::free(E* addr, size_t bytes)
|
|
249 {
|
|
250 resource_free_bytes((char*) addr, bytes);
|
|
251 }
|
|
252
|
|
253 template <class E>
|
|
254 void StackIterator<E>::sync()
|
|
255 {
|
|
256 _full_seg_size = _stack._full_seg_size;
|
|
257 _cur_seg_size = _stack._cur_seg_size;
|
|
258 _cur_seg = _stack._cur_seg;
|
|
259 }
|
|
260
|
|
261 template <class E>
|
|
262 E* StackIterator<E>::next_addr()
|
|
263 {
|
|
264 assert(!is_empty(), "no items left");
|
|
265 if (_cur_seg_size == 1) {
|
|
266 E* addr = _cur_seg;
|
|
267 _cur_seg = _stack.get_link(_cur_seg);
|
|
268 _cur_seg_size = _stack.segment_size();
|
|
269 _full_seg_size -= _stack.segment_size();
|
|
270 return addr;
|
|
271 }
|
|
272 return _cur_seg + --_cur_seg_size;
|
|
273 }
|