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annotate src/share/vm/utilities/growableArray.hpp @ 3763:e66f38dd58a9
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date | Wed, 08 Jun 2011 08:39:53 -0700 |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1997, 2010, 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 * | |
1552
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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 | |
1972 | 25 #ifndef SHARE_VM_UTILITIES_GROWABLEARRAY_HPP |
26 #define SHARE_VM_UTILITIES_GROWABLEARRAY_HPP | |
27 | |
28 #include "memory/allocation.hpp" | |
29 #include "memory/allocation.inline.hpp" | |
30 #include "utilities/debug.hpp" | |
31 #include "utilities/globalDefinitions.hpp" | |
32 #include "utilities/top.hpp" | |
33 | |
0 | 34 // A growable array. |
35 | |
36 /*************************************************************************/ | |
37 /* */ | |
38 /* WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING */ | |
39 /* */ | |
40 /* Should you use GrowableArrays to contain handles you must be certain */ | |
41 /* the the GrowableArray does not outlive the HandleMark that contains */ | |
42 /* the handles. Since GrowableArrays are typically resource allocated */ | |
43 /* the following is an example of INCORRECT CODE, */ | |
44 /* */ | |
45 /* ResourceMark rm; */ | |
46 /* GrowableArray<Handle>* arr = new GrowableArray<Handle>(size); */ | |
47 /* if (blah) { */ | |
48 /* while (...) { */ | |
49 /* HandleMark hm; */ | |
50 /* ... */ | |
51 /* Handle h(THREAD, some_oop); */ | |
52 /* arr->append(h); */ | |
53 /* } */ | |
54 /* } */ | |
55 /* if (arr->length() != 0 ) { */ | |
56 /* oop bad_oop = arr->at(0)(); // Handle is BAD HERE. */ | |
57 /* ... */ | |
58 /* } */ | |
59 /* */ | |
60 /* If the GrowableArrays you are creating is C_Heap allocated then it */ | |
61 /* hould not old handles since the handles could trivially try and */ | |
62 /* outlive their HandleMark. In some situations you might need to do */ | |
63 /* this and it would be legal but be very careful and see if you can do */ | |
64 /* the code in some other manner. */ | |
65 /* */ | |
66 /*************************************************************************/ | |
67 | |
68 // To call default constructor the placement operator new() is used. | |
69 // It should be empty (it only returns the passed void* pointer). | |
70 // The definition of placement operator new(size_t, void*) in the <new>. | |
71 | |
72 #include <new> | |
73 | |
74 // Need the correct linkage to call qsort without warnings | |
75 extern "C" { | |
76 typedef int (*_sort_Fn)(const void *, const void *); | |
77 } | |
78 | |
79 class GenericGrowableArray : public ResourceObj { | |
80 protected: | |
81 int _len; // current length | |
82 int _max; // maximum length | |
83 Arena* _arena; // Indicates where allocation occurs: | |
84 // 0 means default ResourceArea | |
85 // 1 means on C heap | |
86 // otherwise, allocate in _arena | |
87 #ifdef ASSERT | |
88 int _nesting; // resource area nesting at creation | |
89 void set_nesting(); | |
90 void check_nesting(); | |
91 #else | |
92 #define set_nesting(); | |
93 #define check_nesting(); | |
94 #endif | |
95 | |
96 // Where are we going to allocate memory? | |
97 bool on_C_heap() { return _arena == (Arena*)1; } | |
98 bool on_stack () { return _arena == NULL; } | |
99 bool on_arena () { return _arena > (Arena*)1; } | |
100 | |
101 // This GA will use the resource stack for storage if c_heap==false, | |
102 // Else it will use the C heap. Use clear_and_deallocate to avoid leaks. | |
103 GenericGrowableArray(int initial_size, int initial_len, bool c_heap) { | |
104 _len = initial_len; | |
105 _max = initial_size; | |
106 assert(_len >= 0 && _len <= _max, "initial_len too big"); | |
107 _arena = (c_heap ? (Arena*)1 : NULL); | |
108 set_nesting(); | |
1685 | 109 assert(!on_C_heap() || allocated_on_C_heap(), "growable array must be on C heap if elements are"); |
110 assert(!on_stack() || | |
111 (allocated_on_res_area() || allocated_on_stack()), | |
112 "growable array must be on stack if elements are not on arena and not on C heap"); | |
0 | 113 } |
114 | |
115 // This GA will use the given arena for storage. | |
116 // Consider using new(arena) GrowableArray<T> to allocate the header. | |
117 GenericGrowableArray(Arena* arena, int initial_size, int initial_len) { | |
118 _len = initial_len; | |
119 _max = initial_size; | |
120 assert(_len >= 0 && _len <= _max, "initial_len too big"); | |
121 _arena = arena; | |
122 assert(on_arena(), "arena has taken on reserved value 0 or 1"); | |
1685 | 123 // Relax next assert to allow object allocation on resource area, |
124 // on stack or embedded into an other object. | |
125 assert(allocated_on_arena() || allocated_on_stack(), | |
126 "growable array must be on arena or on stack if elements are on arena"); | |
0 | 127 } |
128 | |
129 void* raw_allocate(int elementSize); | |
432 | 130 |
131 // some uses pass the Thread explicitly for speed (4990299 tuning) | |
132 void* raw_allocate(Thread* thread, int elementSize) { | |
133 assert(on_stack(), "fast ResourceObj path only"); | |
134 return (void*)resource_allocate_bytes(thread, elementSize * _max); | |
135 } | |
0 | 136 }; |
137 | |
138 template<class E> class GrowableArray : public GenericGrowableArray { | |
139 private: | |
140 E* _data; // data array | |
141 | |
142 void grow(int j); | |
143 void raw_at_put_grow(int i, const E& p, const E& fill); | |
144 void clear_and_deallocate(); | |
145 public: | |
432 | 146 GrowableArray(Thread* thread, int initial_size) : GenericGrowableArray(initial_size, 0, false) { |
147 _data = (E*)raw_allocate(thread, sizeof(E)); | |
148 for (int i = 0; i < _max; i++) ::new ((void*)&_data[i]) E(); | |
149 } | |
150 | |
0 | 151 GrowableArray(int initial_size, bool C_heap = false) : GenericGrowableArray(initial_size, 0, C_heap) { |
152 _data = (E*)raw_allocate(sizeof(E)); | |
153 for (int i = 0; i < _max; i++) ::new ((void*)&_data[i]) E(); | |
154 } | |
155 | |
156 GrowableArray(int initial_size, int initial_len, const E& filler, bool C_heap = false) : GenericGrowableArray(initial_size, initial_len, C_heap) { | |
157 _data = (E*)raw_allocate(sizeof(E)); | |
158 int i = 0; | |
159 for (; i < _len; i++) ::new ((void*)&_data[i]) E(filler); | |
160 for (; i < _max; i++) ::new ((void*)&_data[i]) E(); | |
161 } | |
162 | |
163 GrowableArray(Arena* arena, int initial_size, int initial_len, const E& filler) : GenericGrowableArray(arena, initial_size, initial_len) { | |
164 _data = (E*)raw_allocate(sizeof(E)); | |
165 int i = 0; | |
166 for (; i < _len; i++) ::new ((void*)&_data[i]) E(filler); | |
167 for (; i < _max; i++) ::new ((void*)&_data[i]) E(); | |
168 } | |
169 | |
170 GrowableArray() : GenericGrowableArray(2, 0, false) { | |
171 _data = (E*)raw_allocate(sizeof(E)); | |
172 ::new ((void*)&_data[0]) E(); | |
173 ::new ((void*)&_data[1]) E(); | |
174 } | |
175 | |
176 // Does nothing for resource and arena objects | |
177 ~GrowableArray() { if (on_C_heap()) clear_and_deallocate(); } | |
178 | |
179 void clear() { _len = 0; } | |
180 int length() const { return _len; } | |
181 void trunc_to(int l) { assert(l <= _len,"cannot increase length"); _len = l; } | |
182 bool is_empty() const { return _len == 0; } | |
183 bool is_nonempty() const { return _len != 0; } | |
184 bool is_full() const { return _len == _max; } | |
185 DEBUG_ONLY(E* data_addr() const { return _data; }) | |
186 | |
187 void print(); | |
188 | |
432 | 189 int append(const E& elem) { |
0 | 190 check_nesting(); |
191 if (_len == _max) grow(_len); | |
432 | 192 int idx = _len++; |
193 _data[idx] = elem; | |
194 return idx; | |
0 | 195 } |
196 | |
197 void append_if_missing(const E& elem) { | |
198 if (!contains(elem)) append(elem); | |
199 } | |
200 | |
201 E at(int i) const { | |
202 assert(0 <= i && i < _len, "illegal index"); | |
203 return _data[i]; | |
204 } | |
205 | |
206 E* adr_at(int i) const { | |
207 assert(0 <= i && i < _len, "illegal index"); | |
208 return &_data[i]; | |
209 } | |
210 | |
211 E first() const { | |
212 assert(_len > 0, "empty list"); | |
213 return _data[0]; | |
214 } | |
215 | |
216 E top() const { | |
217 assert(_len > 0, "empty list"); | |
218 return _data[_len-1]; | |
219 } | |
220 | |
221 void push(const E& elem) { append(elem); } | |
222 | |
223 E pop() { | |
224 assert(_len > 0, "empty list"); | |
225 return _data[--_len]; | |
226 } | |
227 | |
228 void at_put(int i, const E& elem) { | |
229 assert(0 <= i && i < _len, "illegal index"); | |
230 _data[i] = elem; | |
231 } | |
232 | |
233 E at_grow(int i, const E& fill = E()) { | |
234 assert(0 <= i, "negative index"); | |
235 check_nesting(); | |
236 if (i >= _len) { | |
237 if (i >= _max) grow(i); | |
238 for (int j = _len; j <= i; j++) | |
239 _data[j] = fill; | |
240 _len = i+1; | |
241 } | |
242 return _data[i]; | |
243 } | |
244 | |
245 void at_put_grow(int i, const E& elem, const E& fill = E()) { | |
246 assert(0 <= i, "negative index"); | |
247 check_nesting(); | |
248 raw_at_put_grow(i, elem, fill); | |
249 } | |
250 | |
251 bool contains(const E& elem) const { | |
252 for (int i = 0; i < _len; i++) { | |
253 if (_data[i] == elem) return true; | |
254 } | |
255 return false; | |
256 } | |
257 | |
258 int find(const E& elem) const { | |
259 for (int i = 0; i < _len; i++) { | |
260 if (_data[i] == elem) return i; | |
261 } | |
262 return -1; | |
263 } | |
264 | |
265 int find(void* token, bool f(void*, E)) const { | |
266 for (int i = 0; i < _len; i++) { | |
267 if (f(token, _data[i])) return i; | |
268 } | |
269 return -1; | |
270 } | |
271 | |
272 int find_at_end(void* token, bool f(void*, E)) const { | |
273 // start at the end of the array | |
274 for (int i = _len-1; i >= 0; i--) { | |
275 if (f(token, _data[i])) return i; | |
276 } | |
277 return -1; | |
278 } | |
279 | |
280 void remove(const E& elem) { | |
281 for (int i = 0; i < _len; i++) { | |
282 if (_data[i] == elem) { | |
283 for (int j = i + 1; j < _len; j++) _data[j-1] = _data[j]; | |
284 _len--; | |
285 return; | |
286 } | |
287 } | |
288 ShouldNotReachHere(); | |
289 } | |
290 | |
291 void remove_at(int index) { | |
292 assert(0 <= index && index < _len, "illegal index"); | |
293 for (int j = index + 1; j < _len; j++) _data[j-1] = _data[j]; | |
294 _len--; | |
295 } | |
296 | |
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297 // inserts the given element before the element at index i |
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298 void insert_before(const int idx, const E& elem) { |
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299 check_nesting(); |
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300 if (_len == _max) grow(_len); |
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301 for (int j = _len - 1; j >= idx; j--) { |
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302 _data[j + 1] = _data[j]; |
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303 } |
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304 _len++; |
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305 _data[idx] = elem; |
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306 } |
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307 |
0 | 308 void appendAll(const GrowableArray<E>* l) { |
309 for (int i = 0; i < l->_len; i++) { | |
310 raw_at_put_grow(_len, l->_data[i], 0); | |
311 } | |
312 } | |
313 | |
314 void sort(int f(E*,E*)) { | |
315 qsort(_data, length(), sizeof(E), (_sort_Fn)f); | |
316 } | |
317 // sort by fixed-stride sub arrays: | |
318 void sort(int f(E*,E*), int stride) { | |
319 qsort(_data, length() / stride, sizeof(E) * stride, (_sort_Fn)f); | |
320 } | |
321 }; | |
322 | |
323 // Global GrowableArray methods (one instance in the library per each 'E' type). | |
324 | |
325 template<class E> void GrowableArray<E>::grow(int j) { | |
326 // grow the array by doubling its size (amortized growth) | |
327 int old_max = _max; | |
328 if (_max == 0) _max = 1; // prevent endless loop | |
329 while (j >= _max) _max = _max*2; | |
330 // j < _max | |
331 E* newData = (E*)raw_allocate(sizeof(E)); | |
332 int i = 0; | |
333 for ( ; i < _len; i++) ::new ((void*)&newData[i]) E(_data[i]); | |
334 for ( ; i < _max; i++) ::new ((void*)&newData[i]) E(); | |
335 for (i = 0; i < old_max; i++) _data[i].~E(); | |
336 if (on_C_heap() && _data != NULL) { | |
337 FreeHeap(_data); | |
338 } | |
339 _data = newData; | |
340 } | |
341 | |
342 template<class E> void GrowableArray<E>::raw_at_put_grow(int i, const E& p, const E& fill) { | |
343 if (i >= _len) { | |
344 if (i >= _max) grow(i); | |
345 for (int j = _len; j < i; j++) | |
346 _data[j] = fill; | |
347 _len = i+1; | |
348 } | |
349 _data[i] = p; | |
350 } | |
351 | |
352 // This function clears and deallocate the data in the growable array that | |
353 // has been allocated on the C heap. It's not public - called by the | |
354 // destructor. | |
355 template<class E> void GrowableArray<E>::clear_and_deallocate() { | |
356 assert(on_C_heap(), | |
357 "clear_and_deallocate should only be called when on C heap"); | |
358 clear(); | |
359 if (_data != NULL) { | |
360 for (int i = 0; i < _max; i++) _data[i].~E(); | |
361 FreeHeap(_data); | |
362 _data = NULL; | |
363 } | |
364 } | |
365 | |
366 template<class E> void GrowableArray<E>::print() { | |
367 tty->print("Growable Array " INTPTR_FORMAT, this); | |
368 tty->print(": length %ld (_max %ld) { ", _len, _max); | |
369 for (int i = 0; i < _len; i++) tty->print(INTPTR_FORMAT " ", *(intptr_t*)&(_data[i])); | |
370 tty->print("}\n"); | |
371 } | |
1972 | 372 |
373 #endif // SHARE_VM_UTILITIES_GROWABLEARRAY_HPP |