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annotate src/share/vm/utilities/growableArray.hpp @ 1616:38e8278318ca
6656830: assert((*p)->is_oop(),"expected an oop while scanning weak refs")
Reviewed-by: dcubed, kvn, twisti
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date | Mon, 21 Jun 2010 14:26:17 -0700 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2008, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 // A growable array. | |
26 | |
27 /*************************************************************************/ | |
28 /* */ | |
29 /* WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING */ | |
30 /* */ | |
31 /* Should you use GrowableArrays to contain handles you must be certain */ | |
32 /* the the GrowableArray does not outlive the HandleMark that contains */ | |
33 /* the handles. Since GrowableArrays are typically resource allocated */ | |
34 /* the following is an example of INCORRECT CODE, */ | |
35 /* */ | |
36 /* ResourceMark rm; */ | |
37 /* GrowableArray<Handle>* arr = new GrowableArray<Handle>(size); */ | |
38 /* if (blah) { */ | |
39 /* while (...) { */ | |
40 /* HandleMark hm; */ | |
41 /* ... */ | |
42 /* Handle h(THREAD, some_oop); */ | |
43 /* arr->append(h); */ | |
44 /* } */ | |
45 /* } */ | |
46 /* if (arr->length() != 0 ) { */ | |
47 /* oop bad_oop = arr->at(0)(); // Handle is BAD HERE. */ | |
48 /* ... */ | |
49 /* } */ | |
50 /* */ | |
51 /* If the GrowableArrays you are creating is C_Heap allocated then it */ | |
52 /* hould not old handles since the handles could trivially try and */ | |
53 /* outlive their HandleMark. In some situations you might need to do */ | |
54 /* this and it would be legal but be very careful and see if you can do */ | |
55 /* the code in some other manner. */ | |
56 /* */ | |
57 /*************************************************************************/ | |
58 | |
59 // To call default constructor the placement operator new() is used. | |
60 // It should be empty (it only returns the passed void* pointer). | |
61 // The definition of placement operator new(size_t, void*) in the <new>. | |
62 | |
63 #include <new> | |
64 | |
65 // Need the correct linkage to call qsort without warnings | |
66 extern "C" { | |
67 typedef int (*_sort_Fn)(const void *, const void *); | |
68 } | |
69 | |
70 class GenericGrowableArray : public ResourceObj { | |
71 protected: | |
72 int _len; // current length | |
73 int _max; // maximum length | |
74 Arena* _arena; // Indicates where allocation occurs: | |
75 // 0 means default ResourceArea | |
76 // 1 means on C heap | |
77 // otherwise, allocate in _arena | |
78 #ifdef ASSERT | |
79 int _nesting; // resource area nesting at creation | |
80 void set_nesting(); | |
81 void check_nesting(); | |
82 #else | |
83 #define set_nesting(); | |
84 #define check_nesting(); | |
85 #endif | |
86 | |
87 // Where are we going to allocate memory? | |
88 bool on_C_heap() { return _arena == (Arena*)1; } | |
89 bool on_stack () { return _arena == NULL; } | |
90 bool on_arena () { return _arena > (Arena*)1; } | |
91 | |
92 // This GA will use the resource stack for storage if c_heap==false, | |
93 // Else it will use the C heap. Use clear_and_deallocate to avoid leaks. | |
94 GenericGrowableArray(int initial_size, int initial_len, bool c_heap) { | |
95 _len = initial_len; | |
96 _max = initial_size; | |
97 assert(_len >= 0 && _len <= _max, "initial_len too big"); | |
98 _arena = (c_heap ? (Arena*)1 : NULL); | |
99 set_nesting(); | |
100 assert(!c_heap || allocated_on_C_heap(), "growable array must be on C heap if elements are"); | |
101 } | |
102 | |
103 // This GA will use the given arena for storage. | |
104 // Consider using new(arena) GrowableArray<T> to allocate the header. | |
105 GenericGrowableArray(Arena* arena, int initial_size, int initial_len) { | |
106 _len = initial_len; | |
107 _max = initial_size; | |
108 assert(_len >= 0 && _len <= _max, "initial_len too big"); | |
109 _arena = arena; | |
110 assert(on_arena(), "arena has taken on reserved value 0 or 1"); | |
111 } | |
112 | |
113 void* raw_allocate(int elementSize); | |
432 | 114 |
115 // some uses pass the Thread explicitly for speed (4990299 tuning) | |
116 void* raw_allocate(Thread* thread, int elementSize) { | |
117 assert(on_stack(), "fast ResourceObj path only"); | |
118 return (void*)resource_allocate_bytes(thread, elementSize * _max); | |
119 } | |
0 | 120 }; |
121 | |
122 template<class E> class GrowableArray : public GenericGrowableArray { | |
123 private: | |
124 E* _data; // data array | |
125 | |
126 void grow(int j); | |
127 void raw_at_put_grow(int i, const E& p, const E& fill); | |
128 void clear_and_deallocate(); | |
129 public: | |
432 | 130 GrowableArray(Thread* thread, int initial_size) : GenericGrowableArray(initial_size, 0, false) { |
131 _data = (E*)raw_allocate(thread, sizeof(E)); | |
132 for (int i = 0; i < _max; i++) ::new ((void*)&_data[i]) E(); | |
133 } | |
134 | |
0 | 135 GrowableArray(int initial_size, bool C_heap = false) : GenericGrowableArray(initial_size, 0, C_heap) { |
136 _data = (E*)raw_allocate(sizeof(E)); | |
137 for (int i = 0; i < _max; i++) ::new ((void*)&_data[i]) E(); | |
138 } | |
139 | |
140 GrowableArray(int initial_size, int initial_len, const E& filler, bool C_heap = false) : GenericGrowableArray(initial_size, initial_len, C_heap) { | |
141 _data = (E*)raw_allocate(sizeof(E)); | |
142 int i = 0; | |
143 for (; i < _len; i++) ::new ((void*)&_data[i]) E(filler); | |
144 for (; i < _max; i++) ::new ((void*)&_data[i]) E(); | |
145 } | |
146 | |
147 GrowableArray(Arena* arena, int initial_size, int initial_len, const E& filler) : GenericGrowableArray(arena, initial_size, initial_len) { | |
148 _data = (E*)raw_allocate(sizeof(E)); | |
149 int i = 0; | |
150 for (; i < _len; i++) ::new ((void*)&_data[i]) E(filler); | |
151 for (; i < _max; i++) ::new ((void*)&_data[i]) E(); | |
152 } | |
153 | |
154 GrowableArray() : GenericGrowableArray(2, 0, false) { | |
155 _data = (E*)raw_allocate(sizeof(E)); | |
156 ::new ((void*)&_data[0]) E(); | |
157 ::new ((void*)&_data[1]) E(); | |
158 } | |
159 | |
160 // Does nothing for resource and arena objects | |
161 ~GrowableArray() { if (on_C_heap()) clear_and_deallocate(); } | |
162 | |
163 void clear() { _len = 0; } | |
164 int length() const { return _len; } | |
165 void trunc_to(int l) { assert(l <= _len,"cannot increase length"); _len = l; } | |
166 bool is_empty() const { return _len == 0; } | |
167 bool is_nonempty() const { return _len != 0; } | |
168 bool is_full() const { return _len == _max; } | |
169 DEBUG_ONLY(E* data_addr() const { return _data; }) | |
170 | |
171 void print(); | |
172 | |
432 | 173 int append(const E& elem) { |
0 | 174 check_nesting(); |
175 if (_len == _max) grow(_len); | |
432 | 176 int idx = _len++; |
177 _data[idx] = elem; | |
178 return idx; | |
0 | 179 } |
180 | |
181 void append_if_missing(const E& elem) { | |
182 if (!contains(elem)) append(elem); | |
183 } | |
184 | |
185 E at(int i) const { | |
186 assert(0 <= i && i < _len, "illegal index"); | |
187 return _data[i]; | |
188 } | |
189 | |
190 E* adr_at(int i) const { | |
191 assert(0 <= i && i < _len, "illegal index"); | |
192 return &_data[i]; | |
193 } | |
194 | |
195 E first() const { | |
196 assert(_len > 0, "empty list"); | |
197 return _data[0]; | |
198 } | |
199 | |
200 E top() const { | |
201 assert(_len > 0, "empty list"); | |
202 return _data[_len-1]; | |
203 } | |
204 | |
205 void push(const E& elem) { append(elem); } | |
206 | |
207 E pop() { | |
208 assert(_len > 0, "empty list"); | |
209 return _data[--_len]; | |
210 } | |
211 | |
212 void at_put(int i, const E& elem) { | |
213 assert(0 <= i && i < _len, "illegal index"); | |
214 _data[i] = elem; | |
215 } | |
216 | |
217 E at_grow(int i, const E& fill = E()) { | |
218 assert(0 <= i, "negative index"); | |
219 check_nesting(); | |
220 if (i >= _len) { | |
221 if (i >= _max) grow(i); | |
222 for (int j = _len; j <= i; j++) | |
223 _data[j] = fill; | |
224 _len = i+1; | |
225 } | |
226 return _data[i]; | |
227 } | |
228 | |
229 void at_put_grow(int i, const E& elem, const E& fill = E()) { | |
230 assert(0 <= i, "negative index"); | |
231 check_nesting(); | |
232 raw_at_put_grow(i, elem, fill); | |
233 } | |
234 | |
235 bool contains(const E& elem) const { | |
236 for (int i = 0; i < _len; i++) { | |
237 if (_data[i] == elem) return true; | |
238 } | |
239 return false; | |
240 } | |
241 | |
242 int find(const E& elem) const { | |
243 for (int i = 0; i < _len; i++) { | |
244 if (_data[i] == elem) return i; | |
245 } | |
246 return -1; | |
247 } | |
248 | |
249 int find(void* token, bool f(void*, E)) const { | |
250 for (int i = 0; i < _len; i++) { | |
251 if (f(token, _data[i])) return i; | |
252 } | |
253 return -1; | |
254 } | |
255 | |
256 int find_at_end(void* token, bool f(void*, E)) const { | |
257 // start at the end of the array | |
258 for (int i = _len-1; i >= 0; i--) { | |
259 if (f(token, _data[i])) return i; | |
260 } | |
261 return -1; | |
262 } | |
263 | |
264 void remove(const E& elem) { | |
265 for (int i = 0; i < _len; i++) { | |
266 if (_data[i] == elem) { | |
267 for (int j = i + 1; j < _len; j++) _data[j-1] = _data[j]; | |
268 _len--; | |
269 return; | |
270 } | |
271 } | |
272 ShouldNotReachHere(); | |
273 } | |
274 | |
275 void remove_at(int index) { | |
276 assert(0 <= index && index < _len, "illegal index"); | |
277 for (int j = index + 1; j < _len; j++) _data[j-1] = _data[j]; | |
278 _len--; | |
279 } | |
280 | |
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281 // inserts the given element before the element at index i |
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282 void insert_before(const int idx, const E& elem) { |
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283 check_nesting(); |
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284 if (_len == _max) grow(_len); |
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285 for (int j = _len - 1; j >= idx; j--) { |
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286 _data[j + 1] = _data[j]; |
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287 } |
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288 _len++; |
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289 _data[idx] = elem; |
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290 } |
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291 |
0 | 292 void appendAll(const GrowableArray<E>* l) { |
293 for (int i = 0; i < l->_len; i++) { | |
294 raw_at_put_grow(_len, l->_data[i], 0); | |
295 } | |
296 } | |
297 | |
298 void sort(int f(E*,E*)) { | |
299 qsort(_data, length(), sizeof(E), (_sort_Fn)f); | |
300 } | |
301 // sort by fixed-stride sub arrays: | |
302 void sort(int f(E*,E*), int stride) { | |
303 qsort(_data, length() / stride, sizeof(E) * stride, (_sort_Fn)f); | |
304 } | |
305 }; | |
306 | |
307 // Global GrowableArray methods (one instance in the library per each 'E' type). | |
308 | |
309 template<class E> void GrowableArray<E>::grow(int j) { | |
310 // grow the array by doubling its size (amortized growth) | |
311 int old_max = _max; | |
312 if (_max == 0) _max = 1; // prevent endless loop | |
313 while (j >= _max) _max = _max*2; | |
314 // j < _max | |
315 E* newData = (E*)raw_allocate(sizeof(E)); | |
316 int i = 0; | |
317 for ( ; i < _len; i++) ::new ((void*)&newData[i]) E(_data[i]); | |
318 for ( ; i < _max; i++) ::new ((void*)&newData[i]) E(); | |
319 for (i = 0; i < old_max; i++) _data[i].~E(); | |
320 if (on_C_heap() && _data != NULL) { | |
321 FreeHeap(_data); | |
322 } | |
323 _data = newData; | |
324 } | |
325 | |
326 template<class E> void GrowableArray<E>::raw_at_put_grow(int i, const E& p, const E& fill) { | |
327 if (i >= _len) { | |
328 if (i >= _max) grow(i); | |
329 for (int j = _len; j < i; j++) | |
330 _data[j] = fill; | |
331 _len = i+1; | |
332 } | |
333 _data[i] = p; | |
334 } | |
335 | |
336 // This function clears and deallocate the data in the growable array that | |
337 // has been allocated on the C heap. It's not public - called by the | |
338 // destructor. | |
339 template<class E> void GrowableArray<E>::clear_and_deallocate() { | |
340 assert(on_C_heap(), | |
341 "clear_and_deallocate should only be called when on C heap"); | |
342 clear(); | |
343 if (_data != NULL) { | |
344 for (int i = 0; i < _max; i++) _data[i].~E(); | |
345 FreeHeap(_data); | |
346 _data = NULL; | |
347 } | |
348 } | |
349 | |
350 template<class E> void GrowableArray<E>::print() { | |
351 tty->print("Growable Array " INTPTR_FORMAT, this); | |
352 tty->print(": length %ld (_max %ld) { ", _len, _max); | |
353 for (int i = 0; i < _len; i++) tty->print(INTPTR_FORMAT " ", *(intptr_t*)&(_data[i])); | |
354 tty->print("}\n"); | |
355 } |