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annotate src/share/vm/memory/sharedHeap.hpp @ 2388:006b3750a4d4
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date | Thu, 24 Mar 2011 23:06:13 -0700 |
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0 | 1 /* |
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2 * Copyright (c) 2000, 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 * | |
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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_MEMORY_SHAREDHEAP_HPP |
26 #define SHARE_VM_MEMORY_SHAREDHEAP_HPP | |
27 | |
28 #include "gc_interface/collectedHeap.hpp" | |
29 #include "memory/generation.hpp" | |
30 #include "memory/permGen.hpp" | |
31 | |
0 | 32 // A "SharedHeap" is an implementation of a java heap for HotSpot. This |
33 // is an abstract class: there may be many different kinds of heaps. This | |
34 // class defines the functions that a heap must implement, and contains | |
35 // infrastructure common to all heaps. | |
36 | |
37 class PermGen; | |
38 class Generation; | |
39 class BarrierSet; | |
40 class GenRemSet; | |
41 class Space; | |
42 class SpaceClosure; | |
43 class OopClosure; | |
44 class OopsInGenClosure; | |
45 class ObjectClosure; | |
46 class SubTasksDone; | |
47 class WorkGang; | |
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48 class FlexibleWorkGang; |
0 | 49 class CollectorPolicy; |
50 class KlassHandle; | |
51 | |
52 class SharedHeap : public CollectedHeap { | |
53 friend class VMStructs; | |
54 | |
342 | 55 friend class VM_GC_Operation; |
56 friend class VM_CGC_Operation; | |
57 | |
0 | 58 private: |
59 // For claiming strong_roots tasks. | |
60 SubTasksDone* _process_strong_tasks; | |
61 | |
62 protected: | |
63 // There should be only a single instance of "SharedHeap" in a program. | |
64 // This is enforced with the protected constructor below, which will also | |
65 // set the static pointer "_sh" to that instance. | |
66 static SharedHeap* _sh; | |
67 | |
68 // All heaps contain a "permanent generation." This is some ways | |
69 // similar to a generation in a generational system, in other ways not. | |
70 // See the "PermGen" class. | |
71 PermGen* _perm_gen; | |
72 | |
73 // and the Gen Remembered Set, at least one good enough to scan the perm | |
74 // gen. | |
75 GenRemSet* _rem_set; | |
76 | |
77 // A gc policy, controls global gc resource issues | |
78 CollectorPolicy *_collector_policy; | |
79 | |
80 // See the discussion below, in the specification of the reader function | |
81 // for this variable. | |
82 int _strong_roots_parity; | |
83 | |
84 // If we're doing parallel GC, use this gang of threads. | |
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85 FlexibleWorkGang* _workers; |
0 | 86 |
87 // Number of parallel threads currently working on GC tasks. | |
88 // O indicates use sequential code; 1 means use parallel code even with | |
89 // only one thread, for performance testing purposes. | |
90 int _n_par_threads; | |
91 | |
92 // Full initialization is done in a concrete subtype's "initialize" | |
93 // function. | |
94 SharedHeap(CollectorPolicy* policy_); | |
95 | |
342 | 96 // Returns true if the calling thread holds the heap lock, |
97 // or the calling thread is a par gc thread and the heap_lock is held | |
98 // by the vm thread doing a gc operation. | |
99 bool heap_lock_held_for_gc(); | |
100 // True if the heap_lock is held by the a non-gc thread invoking a gc | |
101 // operation. | |
102 bool _thread_holds_heap_lock_for_gc; | |
103 | |
0 | 104 public: |
105 static SharedHeap* heap() { return _sh; } | |
106 | |
107 CollectorPolicy *collector_policy() const { return _collector_policy; } | |
108 | |
109 void set_barrier_set(BarrierSet* bs); | |
110 | |
111 // Does operations required after initialization has been done. | |
112 virtual void post_initialize(); | |
113 | |
114 // Initialization of ("weak") reference processing support | |
115 virtual void ref_processing_init(); | |
116 | |
117 void set_perm(PermGen* perm_gen) { _perm_gen = perm_gen; } | |
118 | |
119 // This function returns the "GenRemSet" object that allows us to scan | |
120 // generations; at least the perm gen, possibly more in a fully | |
121 // generational heap. | |
122 GenRemSet* rem_set() { return _rem_set; } | |
123 | |
124 // These function return the "permanent" generation, in which | |
125 // reflective objects are allocated and stored. Two versions, the second | |
126 // of which returns the view of the perm gen as a generation. | |
127 PermGen* perm() const { return _perm_gen; } | |
128 Generation* perm_gen() const { return _perm_gen->as_gen(); } | |
129 | |
130 // Iteration functions. | |
131 void oop_iterate(OopClosure* cl) = 0; | |
132 | |
133 // Same as above, restricted to a memory region. | |
134 virtual void oop_iterate(MemRegion mr, OopClosure* cl) = 0; | |
135 | |
136 // Iterate over all objects allocated since the last collection, calling | |
137 // "cl->do_object" on each. The heap must have been initialized properly | |
138 // to support this function, or else this call will fail. | |
139 virtual void object_iterate_since_last_GC(ObjectClosure* cl) = 0; | |
140 | |
141 // Iterate over all spaces in use in the heap, in an undefined order. | |
142 virtual void space_iterate(SpaceClosure* cl) = 0; | |
143 | |
144 // A SharedHeap will contain some number of spaces. This finds the | |
145 // space whose reserved area contains the given address, or else returns | |
146 // NULL. | |
147 virtual Space* space_containing(const void* addr) const = 0; | |
148 | |
149 bool no_gc_in_progress() { return !is_gc_active(); } | |
150 | |
151 // Some collectors will perform "process_strong_roots" in parallel. | |
152 // Such a call will involve claiming some fine-grained tasks, such as | |
153 // scanning of threads. To make this process simpler, we provide the | |
154 // "strong_roots_parity()" method. Collectors that start parallel tasks | |
155 // whose threads invoke "process_strong_roots" must | |
156 // call "change_strong_roots_parity" in sequential code starting such a | |
157 // task. (This also means that a parallel thread may only call | |
158 // process_strong_roots once.) | |
159 // | |
160 // For calls to process_strong_roots by sequential code, the parity is | |
161 // updated automatically. | |
162 // | |
163 // The idea is that objects representing fine-grained tasks, such as | |
164 // threads, will contain a "parity" field. A task will is claimed in the | |
165 // current "process_strong_roots" call only if its parity field is the | |
166 // same as the "strong_roots_parity"; task claiming is accomplished by | |
167 // updating the parity field to the strong_roots_parity with a CAS. | |
168 // | |
169 // If the client meats this spec, then strong_roots_parity() will have | |
170 // the following properties: | |
171 // a) to return a different value than was returned before the last | |
172 // call to change_strong_roots_parity, and | |
173 // c) to never return a distinguished value (zero) with which such | |
174 // task-claiming variables may be initialized, to indicate "never | |
175 // claimed". | |
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176 private: |
0 | 177 void change_strong_roots_parity(); |
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178 public: |
0 | 179 int strong_roots_parity() { return _strong_roots_parity; } |
180 | |
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181 // Call these in sequential code around process_strong_roots. |
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182 // strong_roots_prologue calls change_strong_roots_parity, if |
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183 // parallel tasks are enabled. |
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184 class StrongRootsScope : public MarkingCodeBlobClosure::MarkScope { |
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185 public: |
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186 StrongRootsScope(SharedHeap* outer, bool activate = true); |
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187 ~StrongRootsScope(); |
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188 }; |
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189 friend class StrongRootsScope; |
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190 |
0 | 191 enum ScanningOption { |
192 SO_None = 0x0, | |
193 SO_AllClasses = 0x1, | |
194 SO_SystemClasses = 0x2, | |
195 SO_Symbols = 0x4, | |
196 SO_Strings = 0x8, | |
197 SO_CodeCache = 0x10 | |
198 }; | |
199 | |
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200 FlexibleWorkGang* workers() const { return _workers; } |
0 | 201 |
202 // Sets the number of parallel threads that will be doing tasks | |
203 // (such as process strong roots) subsequently. | |
204 virtual void set_par_threads(int t); | |
205 | |
206 // Number of threads currently working on GC tasks. | |
207 int n_par_threads() { return _n_par_threads; } | |
208 | |
209 // Invoke the "do_oop" method the closure "roots" on all root locations. | |
210 // If "collecting_perm_gen" is false, then roots that may only contain | |
211 // references to permGen objects are not scanned. If true, the | |
212 // "perm_gen" closure is applied to all older-to-younger refs in the | |
213 // permanent generation. The "so" argument determines which of roots | |
214 // the closure is applied to: | |
215 // "SO_None" does none; | |
216 // "SO_AllClasses" applies the closure to all entries in the SystemDictionary; | |
217 // "SO_SystemClasses" to all the "system" classes and loaders; | |
218 // "SO_Symbols" applies the closure to all entries in SymbolsTable; | |
219 // "SO_Strings" applies the closure to all entries in StringTable; | |
220 // "SO_CodeCache" applies the closure to all elements of the CodeCache. | |
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221 void process_strong_roots(bool activate_scope, |
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222 bool collecting_perm_gen, |
0 | 223 ScanningOption so, |
224 OopClosure* roots, | |
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225 CodeBlobClosure* code_roots, |
0 | 226 OopsInGenClosure* perm_blk); |
227 | |
228 // Apply "blk" to all the weak roots of the system. These include | |
229 // JNI weak roots, the code cache, system dictionary, symbol table, | |
230 // string table. | |
231 void process_weak_roots(OopClosure* root_closure, | |
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232 CodeBlobClosure* code_roots, |
0 | 233 OopClosure* non_root_closure); |
234 | |
235 // The functions below are helper functions that a subclass of | |
236 // "SharedHeap" can use in the implementation of its virtual | |
237 // functions. | |
238 | |
342 | 239 public: |
0 | 240 |
241 // Do anything common to GC's. | |
242 virtual void gc_prologue(bool full) = 0; | |
243 virtual void gc_epilogue(bool full) = 0; | |
244 | |
245 // | |
246 // New methods from CollectedHeap | |
247 // | |
248 | |
249 size_t permanent_capacity() const { | |
250 assert(perm_gen(), "NULL perm gen"); | |
251 return perm_gen()->capacity(); | |
252 } | |
253 | |
254 size_t permanent_used() const { | |
255 assert(perm_gen(), "NULL perm gen"); | |
256 return perm_gen()->used(); | |
257 } | |
258 | |
259 bool is_in_permanent(const void *p) const { | |
260 assert(perm_gen(), "NULL perm gen"); | |
261 return perm_gen()->is_in_reserved(p); | |
262 } | |
263 | |
264 // Different from is_in_permanent in that is_in_permanent | |
265 // only checks if p is in the reserved area of the heap | |
266 // and this checks to see if it in the commited area. | |
267 // This is typically used by things like the forte stackwalker | |
268 // during verification of suspicious frame values. | |
269 bool is_permanent(const void *p) const { | |
270 assert(perm_gen(), "NULL perm gen"); | |
271 return perm_gen()->is_in(p); | |
272 } | |
273 | |
274 HeapWord* permanent_mem_allocate(size_t size) { | |
275 assert(perm_gen(), "NULL perm gen"); | |
276 return _perm_gen->mem_allocate(size); | |
277 } | |
278 | |
279 void permanent_oop_iterate(OopClosure* cl) { | |
280 assert(perm_gen(), "NULL perm gen"); | |
281 _perm_gen->oop_iterate(cl); | |
282 } | |
283 | |
284 void permanent_object_iterate(ObjectClosure* cl) { | |
285 assert(perm_gen(), "NULL perm gen"); | |
286 _perm_gen->object_iterate(cl); | |
287 } | |
288 | |
289 // Some utilities. | |
342 | 290 void print_size_transition(outputStream* out, |
291 size_t bytes_before, | |
0 | 292 size_t bytes_after, |
293 size_t capacity); | |
294 }; | |
1972 | 295 |
296 #endif // SHARE_VM_MEMORY_SHAREDHEAP_HPP |