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annotate src/share/vm/utilities/growableArray.hpp @ 11969:c65045599519
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Reviewed-by: coleenp, bpittore
author | dholmes |
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date | Thu, 25 Jul 2013 21:05:29 -0400 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, 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 | |
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 { | |
3939 | 80 friend class VMStructs; |
81 | |
0 | 82 protected: |
83 int _len; // current length | |
84 int _max; // maximum length | |
85 Arena* _arena; // Indicates where allocation occurs: | |
86 // 0 means default ResourceArea | |
87 // 1 means on C heap | |
88 // otherwise, allocate in _arena | |
6197 | 89 |
90 MEMFLAGS _memflags; // memory type if allocation in C heap | |
91 | |
0 | 92 #ifdef ASSERT |
93 int _nesting; // resource area nesting at creation | |
94 void set_nesting(); | |
95 void check_nesting(); | |
96 #else | |
97 #define set_nesting(); | |
98 #define check_nesting(); | |
99 #endif | |
100 | |
101 // Where are we going to allocate memory? | |
102 bool on_C_heap() { return _arena == (Arena*)1; } | |
103 bool on_stack () { return _arena == NULL; } | |
104 bool on_arena () { return _arena > (Arena*)1; } | |
105 | |
106 // This GA will use the resource stack for storage if c_heap==false, | |
107 // Else it will use the C heap. Use clear_and_deallocate to avoid leaks. | |
6197 | 108 GenericGrowableArray(int initial_size, int initial_len, bool c_heap, MEMFLAGS flags = mtNone) { |
0 | 109 _len = initial_len; |
110 _max = initial_size; | |
6197 | 111 _memflags = flags; |
112 | |
113 // memory type has to be specified for C heap allocation | |
114 assert(!(c_heap && flags == mtNone), "memory type not specified for C heap object"); | |
115 | |
0 | 116 assert(_len >= 0 && _len <= _max, "initial_len too big"); |
117 _arena = (c_heap ? (Arena*)1 : NULL); | |
118 set_nesting(); | |
1685 | 119 assert(!on_C_heap() || allocated_on_C_heap(), "growable array must be on C heap if elements are"); |
120 assert(!on_stack() || | |
121 (allocated_on_res_area() || allocated_on_stack()), | |
122 "growable array must be on stack if elements are not on arena and not on C heap"); | |
0 | 123 } |
124 | |
125 // This GA will use the given arena for storage. | |
126 // Consider using new(arena) GrowableArray<T> to allocate the header. | |
127 GenericGrowableArray(Arena* arena, int initial_size, int initial_len) { | |
128 _len = initial_len; | |
129 _max = initial_size; | |
130 assert(_len >= 0 && _len <= _max, "initial_len too big"); | |
131 _arena = arena; | |
6197 | 132 _memflags = mtNone; |
133 | |
0 | 134 assert(on_arena(), "arena has taken on reserved value 0 or 1"); |
1685 | 135 // Relax next assert to allow object allocation on resource area, |
136 // on stack or embedded into an other object. | |
137 assert(allocated_on_arena() || allocated_on_stack(), | |
138 "growable array must be on arena or on stack if elements are on arena"); | |
0 | 139 } |
140 | |
141 void* raw_allocate(int elementSize); | |
432 | 142 |
143 // some uses pass the Thread explicitly for speed (4990299 tuning) | |
144 void* raw_allocate(Thread* thread, int elementSize) { | |
145 assert(on_stack(), "fast ResourceObj path only"); | |
146 return (void*)resource_allocate_bytes(thread, elementSize * _max); | |
147 } | |
0 | 148 }; |
149 | |
150 template<class E> class GrowableArray : public GenericGrowableArray { | |
3939 | 151 friend class VMStructs; |
152 | |
0 | 153 private: |
154 E* _data; // data array | |
155 | |
156 void grow(int j); | |
157 void raw_at_put_grow(int i, const E& p, const E& fill); | |
158 void clear_and_deallocate(); | |
159 public: | |
432 | 160 GrowableArray(Thread* thread, int initial_size) : GenericGrowableArray(initial_size, 0, false) { |
161 _data = (E*)raw_allocate(thread, sizeof(E)); | |
162 for (int i = 0; i < _max; i++) ::new ((void*)&_data[i]) E(); | |
163 } | |
164 | |
6197 | 165 GrowableArray(int initial_size, bool C_heap = false, MEMFLAGS F = mtInternal) |
166 : GenericGrowableArray(initial_size, 0, C_heap, F) { | |
0 | 167 _data = (E*)raw_allocate(sizeof(E)); |
168 for (int i = 0; i < _max; i++) ::new ((void*)&_data[i]) E(); | |
169 } | |
170 | |
6197 | 171 GrowableArray(int initial_size, int initial_len, const E& filler, bool C_heap = false, MEMFLAGS memflags = mtInternal) |
172 : GenericGrowableArray(initial_size, initial_len, C_heap, memflags) { | |
0 | 173 _data = (E*)raw_allocate(sizeof(E)); |
174 int i = 0; | |
175 for (; i < _len; i++) ::new ((void*)&_data[i]) E(filler); | |
176 for (; i < _max; i++) ::new ((void*)&_data[i]) E(); | |
177 } | |
178 | |
179 GrowableArray(Arena* arena, int initial_size, int initial_len, const E& filler) : GenericGrowableArray(arena, initial_size, initial_len) { | |
180 _data = (E*)raw_allocate(sizeof(E)); | |
181 int i = 0; | |
182 for (; i < _len; i++) ::new ((void*)&_data[i]) E(filler); | |
183 for (; i < _max; i++) ::new ((void*)&_data[i]) E(); | |
184 } | |
185 | |
186 GrowableArray() : GenericGrowableArray(2, 0, false) { | |
187 _data = (E*)raw_allocate(sizeof(E)); | |
188 ::new ((void*)&_data[0]) E(); | |
189 ::new ((void*)&_data[1]) E(); | |
190 } | |
191 | |
192 // Does nothing for resource and arena objects | |
193 ~GrowableArray() { if (on_C_heap()) clear_and_deallocate(); } | |
194 | |
195 void clear() { _len = 0; } | |
196 int length() const { return _len; } | |
197 void trunc_to(int l) { assert(l <= _len,"cannot increase length"); _len = l; } | |
198 bool is_empty() const { return _len == 0; } | |
199 bool is_nonempty() const { return _len != 0; } | |
200 bool is_full() const { return _len == _max; } | |
201 DEBUG_ONLY(E* data_addr() const { return _data; }) | |
202 | |
203 void print(); | |
204 | |
432 | 205 int append(const E& elem) { |
0 | 206 check_nesting(); |
207 if (_len == _max) grow(_len); | |
432 | 208 int idx = _len++; |
209 _data[idx] = elem; | |
210 return idx; | |
0 | 211 } |
212 | |
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213 bool append_if_missing(const E& elem) { |
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214 // Returns TRUE if elem is added. |
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215 bool missed = !contains(elem); |
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216 if (missed) append(elem); |
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217 return missed; |
0 | 218 } |
219 | |
6934 | 220 E& at(int i) { |
221 assert(0 <= i && i < _len, "illegal index"); | |
222 return _data[i]; | |
223 } | |
224 | |
225 E const& at(int i) const { | |
0 | 226 assert(0 <= i && i < _len, "illegal index"); |
227 return _data[i]; | |
228 } | |
229 | |
230 E* adr_at(int i) const { | |
231 assert(0 <= i && i < _len, "illegal index"); | |
232 return &_data[i]; | |
233 } | |
234 | |
235 E first() const { | |
236 assert(_len > 0, "empty list"); | |
237 return _data[0]; | |
238 } | |
239 | |
240 E top() const { | |
241 assert(_len > 0, "empty list"); | |
242 return _data[_len-1]; | |
243 } | |
244 | |
245 void push(const E& elem) { append(elem); } | |
246 | |
247 E pop() { | |
248 assert(_len > 0, "empty list"); | |
249 return _data[--_len]; | |
250 } | |
251 | |
252 void at_put(int i, const E& elem) { | |
253 assert(0 <= i && i < _len, "illegal index"); | |
254 _data[i] = elem; | |
255 } | |
256 | |
257 E at_grow(int i, const E& fill = E()) { | |
258 assert(0 <= i, "negative index"); | |
259 check_nesting(); | |
260 if (i >= _len) { | |
261 if (i >= _max) grow(i); | |
262 for (int j = _len; j <= i; j++) | |
263 _data[j] = fill; | |
264 _len = i+1; | |
265 } | |
266 return _data[i]; | |
267 } | |
268 | |
269 void at_put_grow(int i, const E& elem, const E& fill = E()) { | |
270 assert(0 <= i, "negative index"); | |
271 check_nesting(); | |
272 raw_at_put_grow(i, elem, fill); | |
273 } | |
274 | |
275 bool contains(const E& elem) const { | |
276 for (int i = 0; i < _len; i++) { | |
277 if (_data[i] == elem) return true; | |
278 } | |
279 return false; | |
280 } | |
281 | |
282 int find(const E& elem) const { | |
283 for (int i = 0; i < _len; i++) { | |
284 if (_data[i] == elem) return i; | |
285 } | |
286 return -1; | |
287 } | |
288 | |
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289 int find_from_end(const E& elem) const { |
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290 for (int i = _len-1; i >= 0; i--) { |
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291 if (_data[i] == elem) return i; |
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292 } |
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293 return -1; |
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294 } |
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295 |
0 | 296 int find(void* token, bool f(void*, E)) const { |
297 for (int i = 0; i < _len; i++) { | |
298 if (f(token, _data[i])) return i; | |
299 } | |
300 return -1; | |
301 } | |
302 | |
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303 int find_from_end(void* token, bool f(void*, E)) const { |
0 | 304 // start at the end of the array |
305 for (int i = _len-1; i >= 0; i--) { | |
306 if (f(token, _data[i])) return i; | |
307 } | |
308 return -1; | |
309 } | |
310 | |
311 void remove(const E& elem) { | |
312 for (int i = 0; i < _len; i++) { | |
313 if (_data[i] == elem) { | |
314 for (int j = i + 1; j < _len; j++) _data[j-1] = _data[j]; | |
315 _len--; | |
316 return; | |
317 } | |
318 } | |
319 ShouldNotReachHere(); | |
320 } | |
321 | |
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322 // The order is preserved. |
0 | 323 void remove_at(int index) { |
324 assert(0 <= index && index < _len, "illegal index"); | |
325 for (int j = index + 1; j < _len; j++) _data[j-1] = _data[j]; | |
326 _len--; | |
327 } | |
328 | |
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329 // The order is changed. |
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330 void delete_at(int index) { |
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331 assert(0 <= index && index < _len, "illegal index"); |
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332 if (index < --_len) { |
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333 // Replace removed element with last one. |
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334 _data[index] = _data[_len]; |
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335 } |
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336 } |
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337 |
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338 // inserts the given element before the element at index i |
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339 void insert_before(const int idx, const E& elem) { |
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340 check_nesting(); |
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341 if (_len == _max) grow(_len); |
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342 for (int j = _len - 1; j >= idx; j--) { |
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343 _data[j + 1] = _data[j]; |
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344 } |
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345 _len++; |
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346 _data[idx] = elem; |
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347 } |
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348 |
0 | 349 void appendAll(const GrowableArray<E>* l) { |
350 for (int i = 0; i < l->_len; i++) { | |
351 raw_at_put_grow(_len, l->_data[i], 0); | |
352 } | |
353 } | |
354 | |
355 void sort(int f(E*,E*)) { | |
356 qsort(_data, length(), sizeof(E), (_sort_Fn)f); | |
357 } | |
358 // sort by fixed-stride sub arrays: | |
359 void sort(int f(E*,E*), int stride) { | |
360 qsort(_data, length() / stride, sizeof(E) * stride, (_sort_Fn)f); | |
361 } | |
362 }; | |
363 | |
364 // Global GrowableArray methods (one instance in the library per each 'E' type). | |
365 | |
366 template<class E> void GrowableArray<E>::grow(int j) { | |
367 // grow the array by doubling its size (amortized growth) | |
368 int old_max = _max; | |
369 if (_max == 0) _max = 1; // prevent endless loop | |
370 while (j >= _max) _max = _max*2; | |
371 // j < _max | |
372 E* newData = (E*)raw_allocate(sizeof(E)); | |
373 int i = 0; | |
374 for ( ; i < _len; i++) ::new ((void*)&newData[i]) E(_data[i]); | |
375 for ( ; i < _max; i++) ::new ((void*)&newData[i]) E(); | |
376 for (i = 0; i < old_max; i++) _data[i].~E(); | |
377 if (on_C_heap() && _data != NULL) { | |
378 FreeHeap(_data); | |
379 } | |
380 _data = newData; | |
381 } | |
382 | |
383 template<class E> void GrowableArray<E>::raw_at_put_grow(int i, const E& p, const E& fill) { | |
384 if (i >= _len) { | |
385 if (i >= _max) grow(i); | |
386 for (int j = _len; j < i; j++) | |
387 _data[j] = fill; | |
388 _len = i+1; | |
389 } | |
390 _data[i] = p; | |
391 } | |
392 | |
393 // This function clears and deallocate the data in the growable array that | |
394 // has been allocated on the C heap. It's not public - called by the | |
395 // destructor. | |
396 template<class E> void GrowableArray<E>::clear_and_deallocate() { | |
397 assert(on_C_heap(), | |
398 "clear_and_deallocate should only be called when on C heap"); | |
399 clear(); | |
400 if (_data != NULL) { | |
401 for (int i = 0; i < _max; i++) _data[i].~E(); | |
402 FreeHeap(_data); | |
403 _data = NULL; | |
404 } | |
405 } | |
406 | |
407 template<class E> void GrowableArray<E>::print() { | |
408 tty->print("Growable Array " INTPTR_FORMAT, this); | |
409 tty->print(": length %ld (_max %ld) { ", _len, _max); | |
410 for (int i = 0; i < _len; i++) tty->print(INTPTR_FORMAT " ", *(intptr_t*)&(_data[i])); | |
411 tty->print("}\n"); | |
412 } | |
1972 | 413 |
414 #endif // SHARE_VM_UTILITIES_GROWABLEARRAY_HPP |