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annotate src/share/vm/gc_interface/collectedHeap.hpp @ 11722:ff05c78a7f64
use time passed to decide what methods to compile or inline
author | Christian Wirth <christian.wirth@oracle.com> |
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date | Thu, 19 Sep 2013 10:36:56 +0200 |
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0 | 1 /* |
10405 | 2 * Copyright (c) 2001, 2013, 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_GC_INTERFACE_COLLECTEDHEAP_HPP |
26 #define SHARE_VM_GC_INTERFACE_COLLECTEDHEAP_HPP | |
27 | |
28 #include "gc_interface/gcCause.hpp" | |
10405 | 29 #include "gc_implementation/shared/gcWhen.hpp" |
1972 | 30 #include "memory/allocation.hpp" |
31 #include "memory/barrierSet.hpp" | |
32 #include "runtime/handles.hpp" | |
33 #include "runtime/perfData.hpp" | |
34 #include "runtime/safepoint.hpp" | |
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35 #include "utilities/events.hpp" |
1972 | 36 |
0 | 37 // A "CollectedHeap" is an implementation of a java heap for HotSpot. This |
38 // is an abstract class: there may be many different kinds of heaps. This | |
39 // class defines the functions that a heap must implement, and contains | |
40 // infrastructure common to all heaps. | |
41 | |
10405 | 42 class AdaptiveSizePolicy; |
0 | 43 class BarrierSet; |
10405 | 44 class CollectorPolicy; |
45 class GCHeapSummary; | |
46 class GCTimer; | |
47 class GCTracer; | |
48 class MetaspaceSummary; | |
49 class Thread; | |
0 | 50 class ThreadClosure; |
10405 | 51 class VirtualSpaceSummary; |
0 | 52 |
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53 class GCMessage : public FormatBuffer<1024> { |
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54 public: |
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55 bool is_before; |
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56 |
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57 public: |
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58 GCMessage() {} |
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59 }; |
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60 |
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61 class GCHeapLog : public EventLogBase<GCMessage> { |
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62 private: |
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63 void log_heap(bool before); |
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64 |
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65 public: |
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66 GCHeapLog() : EventLogBase<GCMessage>("GC Heap History") {} |
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67 |
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68 void log_heap_before() { |
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69 log_heap(true); |
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70 } |
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71 void log_heap_after() { |
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72 log_heap(false); |
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73 } |
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74 }; |
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75 |
0 | 76 // |
77 // CollectedHeap | |
78 // SharedHeap | |
79 // GenCollectedHeap | |
80 // G1CollectedHeap | |
81 // ParallelScavengeHeap | |
82 // | |
6197 | 83 class CollectedHeap : public CHeapObj<mtInternal> { |
0 | 84 friend class VMStructs; |
85 friend class IsGCActiveMark; // Block structured external access to _is_gc_active | |
86 | |
87 #ifdef ASSERT | |
88 static int _fire_out_of_memory_count; | |
89 #endif | |
90 | |
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91 // Used for filler objects (static, but initialized in ctor). |
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92 static size_t _filler_array_max_size; |
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93 |
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94 GCHeapLog* _gc_heap_log; |
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95 |
1166 | 96 // Used in support of ReduceInitialCardMarks; only consulted if COMPILER2 is being used |
97 bool _defer_initial_card_mark; | |
98 | |
0 | 99 protected: |
100 MemRegion _reserved; | |
101 BarrierSet* _barrier_set; | |
102 bool _is_gc_active; | |
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103 uint _n_par_threads; |
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104 |
0 | 105 unsigned int _total_collections; // ... started |
106 unsigned int _total_full_collections; // ... started | |
107 NOT_PRODUCT(volatile size_t _promotion_failure_alot_count;) | |
108 NOT_PRODUCT(volatile size_t _promotion_failure_alot_gc_number;) | |
109 | |
110 // Reason for current garbage collection. Should be set to | |
111 // a value reflecting no collection between collections. | |
112 GCCause::Cause _gc_cause; | |
113 GCCause::Cause _gc_lastcause; | |
114 PerfStringVariable* _perf_gc_cause; | |
115 PerfStringVariable* _perf_gc_lastcause; | |
116 | |
117 // Constructor | |
118 CollectedHeap(); | |
119 | |
1166 | 120 // Do common initializations that must follow instance construction, |
121 // for example, those needing virtual calls. | |
122 // This code could perhaps be moved into initialize() but would | |
123 // be slightly more awkward because we want the latter to be a | |
124 // pure virtual. | |
125 void pre_initialize(); | |
126 | |
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127 // Create a new tlab. All TLAB allocations must go through this. |
0 | 128 virtual HeapWord* allocate_new_tlab(size_t size); |
129 | |
130 // Accumulate statistics on all tlabs. | |
131 virtual void accumulate_statistics_all_tlabs(); | |
132 | |
133 // Reinitialize tlabs before resuming mutators. | |
134 virtual void resize_all_tlabs(); | |
135 | |
136 // Allocate from the current thread's TLAB, with broken-out slow path. | |
10405 | 137 inline static HeapWord* allocate_from_tlab(KlassHandle klass, Thread* thread, size_t size); |
138 static HeapWord* allocate_from_tlab_slow(KlassHandle klass, Thread* thread, size_t size); | |
0 | 139 |
140 // Allocate an uninitialized block of the given size, or returns NULL if | |
141 // this is impossible. | |
10405 | 142 inline static HeapWord* common_mem_allocate_noinit(KlassHandle klass, size_t size, TRAPS); |
0 | 143 |
144 // Like allocate_init, but the block returned by a successful allocation | |
145 // is guaranteed initialized to zeros. | |
10405 | 146 inline static HeapWord* common_mem_allocate_init(KlassHandle klass, size_t size, TRAPS); |
0 | 147 |
148 // Helper functions for (VM) allocation. | |
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149 inline static void post_allocation_setup_common(KlassHandle klass, HeapWord* obj); |
0 | 150 inline static void post_allocation_setup_no_klass_install(KlassHandle klass, |
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151 HeapWord* objPtr); |
0 | 152 |
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153 inline static void post_allocation_setup_obj(KlassHandle klass, HeapWord* obj); |
0 | 154 |
155 inline static void post_allocation_setup_array(KlassHandle klass, | |
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156 HeapWord* obj, int length); |
0 | 157 |
158 // Clears an allocated object. | |
159 inline static void init_obj(HeapWord* obj, size_t size); | |
160 | |
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161 // Filler object utilities. |
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162 static inline size_t filler_array_hdr_size(); |
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163 static inline size_t filler_array_min_size(); |
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164 |
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165 DEBUG_ONLY(static void fill_args_check(HeapWord* start, size_t words);) |
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166 DEBUG_ONLY(static void zap_filler_array(HeapWord* start, size_t words, bool zap = true);) |
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167 |
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168 // Fill with a single array; caller must ensure filler_array_min_size() <= |
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169 // words <= filler_array_max_size(). |
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170 static inline void fill_with_array(HeapWord* start, size_t words, bool zap = true); |
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171 |
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172 // Fill with a single object (either an int array or a java.lang.Object). |
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173 static inline void fill_with_object_impl(HeapWord* start, size_t words, bool zap = true); |
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174 |
10405 | 175 virtual void trace_heap(GCWhen::Type when, GCTracer* tracer); |
176 | |
0 | 177 // Verification functions |
178 virtual void check_for_bad_heap_word_value(HeapWord* addr, size_t size) | |
179 PRODUCT_RETURN; | |
180 virtual void check_for_non_bad_heap_word_value(HeapWord* addr, size_t size) | |
181 PRODUCT_RETURN; | |
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182 debug_only(static void check_for_valid_allocation_state();) |
0 | 183 |
184 public: | |
185 enum Name { | |
186 Abstract, | |
187 SharedHeap, | |
188 GenCollectedHeap, | |
189 ParallelScavengeHeap, | |
190 G1CollectedHeap | |
191 }; | |
192 | |
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193 static inline size_t filler_array_max_size() { |
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194 return _filler_array_max_size; |
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195 } |
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196 |
0 | 197 virtual CollectedHeap::Name kind() const { return CollectedHeap::Abstract; } |
198 | |
199 /** | |
200 * Returns JNI error code JNI_ENOMEM if memory could not be allocated, | |
201 * and JNI_OK on success. | |
202 */ | |
203 virtual jint initialize() = 0; | |
204 | |
205 // In many heaps, there will be a need to perform some initialization activities | |
206 // after the Universe is fully formed, but before general heap allocation is allowed. | |
207 // This is the correct place to place such initialization methods. | |
208 virtual void post_initialize() = 0; | |
209 | |
210 MemRegion reserved_region() const { return _reserved; } | |
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211 address base() const { return (address)reserved_region().start(); } |
0 | 212 |
213 virtual size_t capacity() const = 0; | |
214 virtual size_t used() const = 0; | |
215 | |
216 // Return "true" if the part of the heap that allocates Java | |
217 // objects has reached the maximal committed limit that it can | |
218 // reach, without a garbage collection. | |
219 virtual bool is_maximal_no_gc() const = 0; | |
220 | |
221 // Support for java.lang.Runtime.maxMemory(): return the maximum amount of | |
222 // memory that the vm could make available for storing 'normal' java objects. | |
223 // This is based on the reserved address space, but should not include space | |
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224 // that the vm uses internally for bookkeeping or temporary storage |
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225 // (e.g., in the case of the young gen, one of the survivor |
0 | 226 // spaces). |
227 virtual size_t max_capacity() const = 0; | |
228 | |
229 // Returns "TRUE" if "p" points into the reserved area of the heap. | |
230 bool is_in_reserved(const void* p) const { | |
231 return _reserved.contains(p); | |
232 } | |
233 | |
234 bool is_in_reserved_or_null(const void* p) const { | |
235 return p == NULL || is_in_reserved(p); | |
236 } | |
237 | |
4708 | 238 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
239 // Since this method can be expensive in general, we restrict its | |
0 | 240 // use to assertion checking only. |
241 virtual bool is_in(const void* p) const = 0; | |
242 | |
243 bool is_in_or_null(const void* p) const { | |
244 return p == NULL || is_in(p); | |
245 } | |
246 | |
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247 bool is_in_place(Metadata** p) { |
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248 return !Universe::heap()->is_in(p); |
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249 } |
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250 bool is_in_place(oop* p) { return Universe::heap()->is_in(p); } |
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251 bool is_in_place(narrowOop* p) { |
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252 oop o = oopDesc::load_decode_heap_oop_not_null(p); |
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253 return Universe::heap()->is_in((const void*)o); |
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254 } |
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255 |
0 | 256 // Let's define some terms: a "closed" subset of a heap is one that |
257 // | |
258 // 1) contains all currently-allocated objects, and | |
259 // | |
260 // 2) is closed under reference: no object in the closed subset | |
261 // references one outside the closed subset. | |
262 // | |
263 // Membership in a heap's closed subset is useful for assertions. | |
264 // Clearly, the entire heap is a closed subset, so the default | |
265 // implementation is to use "is_in_reserved". But this may not be too | |
266 // liberal to perform useful checking. Also, the "is_in" predicate | |
267 // defines a closed subset, but may be too expensive, since "is_in" | |
268 // verifies that its argument points to an object head. The | |
269 // "closed_subset" method allows a heap to define an intermediate | |
270 // predicate, allowing more precise checking than "is_in_reserved" at | |
271 // lower cost than "is_in." | |
272 | |
273 // One important case is a heap composed of disjoint contiguous spaces, | |
274 // such as the Garbage-First collector. Such heaps have a convenient | |
275 // closed subset consisting of the allocated portions of those | |
276 // contiguous spaces. | |
277 | |
278 // Return "TRUE" iff the given pointer points into the heap's defined | |
279 // closed subset (which defaults to the entire heap). | |
280 virtual bool is_in_closed_subset(const void* p) const { | |
281 return is_in_reserved(p); | |
282 } | |
283 | |
284 bool is_in_closed_subset_or_null(const void* p) const { | |
285 return p == NULL || is_in_closed_subset(p); | |
286 } | |
287 | |
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288 #ifdef ASSERT |
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289 // Returns true if "p" is in the part of the |
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290 // heap being collected. |
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291 virtual bool is_in_partial_collection(const void *p) = 0; |
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292 #endif |
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293 |
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294 // An object is scavengable if its location may move during a scavenge. |
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295 // (A scavenge is a GC which is not a full GC.) |
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296 virtual bool is_scavengable(const void *p) = 0; |
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297 |
0 | 298 void set_gc_cause(GCCause::Cause v) { |
299 if (UsePerfData) { | |
300 _gc_lastcause = _gc_cause; | |
301 _perf_gc_lastcause->set_value(GCCause::to_string(_gc_lastcause)); | |
302 _perf_gc_cause->set_value(GCCause::to_string(v)); | |
303 } | |
304 _gc_cause = v; | |
305 } | |
306 GCCause::Cause gc_cause() { return _gc_cause; } | |
307 | |
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308 // Number of threads currently working on GC tasks. |
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309 uint n_par_threads() { return _n_par_threads; } |
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310 |
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311 // May be overridden to set additional parallelism. |
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312 virtual void set_par_threads(uint t) { _n_par_threads = t; }; |
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313 |
4009 | 314 // Allocate and initialize instances of Class |
315 static oop Class_obj_allocate(KlassHandle klass, int size, KlassHandle real_klass, TRAPS); | |
316 | |
0 | 317 // General obj/array allocation facilities. |
318 inline static oop obj_allocate(KlassHandle klass, int size, TRAPS); | |
319 inline static oop array_allocate(KlassHandle klass, int size, int length, TRAPS); | |
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320 inline static oop array_allocate_nozero(KlassHandle klass, int size, int length, TRAPS); |
0 | 321 |
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322 inline static void post_allocation_install_obj_klass(KlassHandle klass, |
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323 oop obj); |
0 | 324 |
325 // Raw memory allocation facilities | |
326 // The obj and array allocate methods are covers for these methods. | |
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327 // mem_allocate() should never be |
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328 // called to allocate TLABs, only individual objects. |
0 | 329 virtual HeapWord* mem_allocate(size_t size, |
330 bool* gc_overhead_limit_was_exceeded) = 0; | |
331 | |
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332 // Utilities for turning raw memory into filler objects. |
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333 // |
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334 // min_fill_size() is the smallest region that can be filled. |
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335 // fill_with_objects() can fill arbitrary-sized regions of the heap using |
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336 // multiple objects. fill_with_object() is for regions known to be smaller |
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337 // than the largest array of integers; it uses a single object to fill the |
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338 // region and has slightly less overhead. |
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339 static size_t min_fill_size() { |
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340 return size_t(align_object_size(oopDesc::header_size())); |
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341 } |
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342 |
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343 static void fill_with_objects(HeapWord* start, size_t words, bool zap = true); |
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344 |
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345 static void fill_with_object(HeapWord* start, size_t words, bool zap = true); |
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346 static void fill_with_object(MemRegion region, bool zap = true) { |
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347 fill_with_object(region.start(), region.word_size(), zap); |
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348 } |
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349 static void fill_with_object(HeapWord* start, HeapWord* end, bool zap = true) { |
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350 fill_with_object(start, pointer_delta(end, start), zap); |
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351 } |
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352 |
0 | 353 // Some heaps may offer a contiguous region for shared non-blocking |
354 // allocation, via inlined code (by exporting the address of the top and | |
355 // end fields defining the extent of the contiguous allocation region.) | |
356 | |
357 // This function returns "true" iff the heap supports this kind of | |
358 // allocation. (Default is "no".) | |
359 virtual bool supports_inline_contig_alloc() const { | |
360 return false; | |
361 } | |
362 // These functions return the addresses of the fields that define the | |
363 // boundaries of the contiguous allocation area. (These fields should be | |
364 // physically near to one another.) | |
365 virtual HeapWord** top_addr() const { | |
366 guarantee(false, "inline contiguous allocation not supported"); | |
367 return NULL; | |
368 } | |
369 virtual HeapWord** end_addr() const { | |
370 guarantee(false, "inline contiguous allocation not supported"); | |
371 return NULL; | |
372 } | |
373 | |
374 // Some heaps may be in an unparseable state at certain times between | |
375 // collections. This may be necessary for efficient implementation of | |
376 // certain allocation-related activities. Calling this function before | |
377 // attempting to parse a heap ensures that the heap is in a parsable | |
378 // state (provided other concurrent activity does not introduce | |
379 // unparsability). It is normally expected, therefore, that this | |
380 // method is invoked with the world stopped. | |
381 // NOTE: if you override this method, make sure you call | |
382 // super::ensure_parsability so that the non-generational | |
383 // part of the work gets done. See implementation of | |
384 // CollectedHeap::ensure_parsability and, for instance, | |
385 // that of GenCollectedHeap::ensure_parsability(). | |
386 // The argument "retire_tlabs" controls whether existing TLABs | |
387 // are merely filled or also retired, thus preventing further | |
388 // allocation from them and necessitating allocation of new TLABs. | |
389 virtual void ensure_parsability(bool retire_tlabs); | |
390 | |
391 // Return an estimate of the maximum allocation that could be performed | |
392 // without triggering any collection or expansion activity. In a | |
393 // generational collector, for example, this is probably the largest | |
394 // allocation that could be supported (without expansion) in the youngest | |
395 // generation. It is "unsafe" because no locks are taken; the result | |
396 // should be treated as an approximation, not a guarantee, for use in | |
397 // heuristic resizing decisions. | |
398 virtual size_t unsafe_max_alloc() = 0; | |
399 | |
400 // Section on thread-local allocation buffers (TLABs) | |
401 // If the heap supports thread-local allocation buffers, it should override | |
402 // the following methods: | |
403 // Returns "true" iff the heap supports thread-local allocation buffers. | |
404 // The default is "no". | |
405 virtual bool supports_tlab_allocation() const { | |
406 return false; | |
407 } | |
408 // The amount of space available for thread-local allocation buffers. | |
409 virtual size_t tlab_capacity(Thread *thr) const { | |
410 guarantee(false, "thread-local allocation buffers not supported"); | |
411 return 0; | |
412 } | |
413 // An estimate of the maximum allocation that could be performed | |
414 // for thread-local allocation buffers without triggering any | |
415 // collection or expansion activity. | |
416 virtual size_t unsafe_max_tlab_alloc(Thread *thr) const { | |
417 guarantee(false, "thread-local allocation buffers not supported"); | |
418 return 0; | |
419 } | |
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420 |
0 | 421 // Can a compiler initialize a new object without store barriers? |
422 // This permission only extends from the creation of a new object | |
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423 // via a TLAB up to the first subsequent safepoint. If such permission |
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424 // is granted for this heap type, the compiler promises to call |
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425 // defer_store_barrier() below on any slow path allocation of |
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426 // a new object for which such initializing store barriers will |
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427 // have been elided. |
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428 virtual bool can_elide_tlab_store_barriers() const = 0; |
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429 |
0 | 430 // If a compiler is eliding store barriers for TLAB-allocated objects, |
431 // there is probably a corresponding slow path which can produce | |
432 // an object allocated anywhere. The compiler's runtime support | |
433 // promises to call this function on such a slow-path-allocated | |
434 // object before performing initializations that have elided | |
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435 // store barriers. Returns new_obj, or maybe a safer copy thereof. |
1166 | 436 virtual oop new_store_pre_barrier(JavaThread* thread, oop new_obj); |
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437 |
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438 // Answers whether an initializing store to a new object currently |
1166 | 439 // allocated at the given address doesn't need a store |
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440 // barrier. Returns "true" if it doesn't need an initializing |
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441 // store barrier; answers "false" if it does. |
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442 virtual bool can_elide_initializing_store_barrier(oop new_obj) = 0; |
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443 |
1166 | 444 // If a compiler is eliding store barriers for TLAB-allocated objects, |
445 // we will be informed of a slow-path allocation by a call | |
446 // to new_store_pre_barrier() above. Such a call precedes the | |
447 // initialization of the object itself, and no post-store-barriers will | |
448 // be issued. Some heap types require that the barrier strictly follows | |
449 // the initializing stores. (This is currently implemented by deferring the | |
450 // barrier until the next slow-path allocation or gc-related safepoint.) | |
451 // This interface answers whether a particular heap type needs the card | |
452 // mark to be thus strictly sequenced after the stores. | |
453 virtual bool card_mark_must_follow_store() const = 0; | |
454 | |
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455 // If the CollectedHeap was asked to defer a store barrier above, |
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456 // this informs it to flush such a deferred store barrier to the |
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457 // remembered set. |
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458 virtual void flush_deferred_store_barrier(JavaThread* thread); |
0 | 459 |
460 // Does this heap support heap inspection (+PrintClassHistogram?) | |
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461 virtual bool supports_heap_inspection() const = 0; |
0 | 462 |
463 // Perform a collection of the heap; intended for use in implementing | |
464 // "System.gc". This probably implies as full a collection as the | |
465 // "CollectedHeap" supports. | |
466 virtual void collect(GCCause::Cause cause) = 0; | |
467 | |
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468 // Perform a full collection |
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469 virtual void do_full_collection(bool clear_all_soft_refs) = 0; |
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470 |
0 | 471 // This interface assumes that it's being called by the |
472 // vm thread. It collects the heap assuming that the | |
473 // heap lock is already held and that we are executing in | |
474 // the context of the vm thread. | |
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475 virtual void collect_as_vm_thread(GCCause::Cause cause); |
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476 |
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477 // Callback from VM_CollectForMetadataAllocation operation. |
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478 MetaWord* satisfy_failed_metadata_allocation(ClassLoaderData* loader_data, |
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479 size_t size, |
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480 Metaspace::MetadataType mdtype); |
0 | 481 |
482 // Returns the barrier set for this heap | |
483 BarrierSet* barrier_set() { return _barrier_set; } | |
484 | |
485 // Returns "true" iff there is a stop-world GC in progress. (I assume | |
486 // that it should answer "false" for the concurrent part of a concurrent | |
487 // collector -- dld). | |
488 bool is_gc_active() const { return _is_gc_active; } | |
489 | |
490 // Total number of GC collections (started) | |
491 unsigned int total_collections() const { return _total_collections; } | |
492 unsigned int total_full_collections() const { return _total_full_collections;} | |
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493 #ifdef GRAAL |
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494 unsigned int* total_collections_address() { return &_total_collections;} |
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495 #endif |
0 | 496 // Increment total number of GC collections (started) |
497 // Should be protected but used by PSMarkSweep - cleanup for 1.4.2 | |
498 void increment_total_collections(bool full = false) { | |
499 _total_collections++; | |
500 if (full) { | |
501 increment_total_full_collections(); | |
502 } | |
503 } | |
504 | |
505 void increment_total_full_collections() { _total_full_collections++; } | |
506 | |
507 // Return the AdaptiveSizePolicy for the heap. | |
508 virtual AdaptiveSizePolicy* size_policy() = 0; | |
509 | |
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510 // Return the CollectorPolicy for the heap |
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511 virtual CollectorPolicy* collector_policy() const = 0; |
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512 |
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513 void oop_iterate_no_header(OopClosure* cl); |
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514 |
0 | 515 // Iterate over all the ref-containing fields of all objects, calling |
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516 // "cl.do_oop" on each. |
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517 virtual void oop_iterate(ExtendedOopClosure* cl) = 0; |
0 | 518 |
519 // Iterate over all objects, calling "cl.do_object" on each. | |
520 virtual void object_iterate(ObjectClosure* cl) = 0; | |
521 | |
517
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522 // Similar to object_iterate() except iterates only |
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523 // over live objects. |
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524 virtual void safe_object_iterate(ObjectClosure* cl) = 0; |
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525 |
0 | 526 // NOTE! There is no requirement that a collector implement these |
527 // functions. | |
528 // | |
529 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
530 // each address in the (reserved) heap is a member of exactly | |
531 // one block. The defining characteristic of a block is that it is | |
532 // possible to find its size, and thus to progress forward to the next | |
533 // block. (Blocks may be of different sizes.) Thus, blocks may | |
534 // represent Java objects, or they might be free blocks in a | |
535 // free-list-based heap (or subheap), as long as the two kinds are | |
536 // distinguishable and the size of each is determinable. | |
537 | |
538 // Returns the address of the start of the "block" that contains the | |
539 // address "addr". We say "blocks" instead of "object" since some heaps | |
540 // may not pack objects densely; a chunk may either be an object or a | |
541 // non-object. | |
542 virtual HeapWord* block_start(const void* addr) const = 0; | |
543 | |
544 // Requires "addr" to be the start of a chunk, and returns its size. | |
545 // "addr + size" is required to be the start of a new chunk, or the end | |
546 // of the active area of the heap. | |
547 virtual size_t block_size(const HeapWord* addr) const = 0; | |
548 | |
549 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
550 // the block is an object. | |
551 virtual bool block_is_obj(const HeapWord* addr) const = 0; | |
552 | |
553 // Returns the longest time (in ms) that has elapsed since the last | |
554 // time that any part of the heap was examined by a garbage collection. | |
555 virtual jlong millis_since_last_gc() = 0; | |
556 | |
557 // Perform any cleanup actions necessary before allowing a verification. | |
558 virtual void prepare_for_verify() = 0; | |
559 | |
615
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560 // Generate any dumps preceding or following a full gc |
10405 | 561 void pre_full_gc_dump(GCTimer* timer); |
562 void post_full_gc_dump(GCTimer* timer); | |
563 | |
564 VirtualSpaceSummary create_heap_space_summary(); | |
565 GCHeapSummary create_heap_summary(); | |
566 | |
567 MetaspaceSummary create_metaspace_summary(); | |
615
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568 |
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569 // Print heap information on the given outputStream. |
0 | 570 virtual void print_on(outputStream* st) const = 0; |
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571 // The default behavior is to call print_on() on tty. |
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572 virtual void print() const { |
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573 print_on(tty); |
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574 } |
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575 // Print more detailed heap information on the given |
10405 | 576 // outputStream. The default behavior is to call print_on(). It is |
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577 // up to each subclass to override it and add any additional output |
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578 // it needs. |
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579 virtual void print_extended_on(outputStream* st) const { |
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580 print_on(st); |
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581 } |
0 | 582 |
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583 virtual void print_on_error(outputStream* st) const { |
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584 st->print_cr("Heap:"); |
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585 print_extended_on(st); |
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586 st->cr(); |
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587 |
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588 _barrier_set->print_on(st); |
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589 } |
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590 |
0 | 591 // Print all GC threads (other than the VM thread) |
592 // used by this heap. | |
593 virtual void print_gc_threads_on(outputStream* st) const = 0; | |
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594 // The default behavior is to call print_gc_threads_on() on tty. |
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595 void print_gc_threads() { |
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596 print_gc_threads_on(tty); |
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597 } |
0 | 598 // Iterator for all GC threads (other than VM thread) |
599 virtual void gc_threads_do(ThreadClosure* tc) const = 0; | |
600 | |
601 // Print any relevant tracing info that flags imply. | |
602 // Default implementation does nothing. | |
603 virtual void print_tracing_info() const = 0; | |
604 | |
10405 | 605 void print_heap_before_gc(); |
606 void print_heap_after_gc(); | |
607 | |
608 void trace_heap_before_gc(GCTracer* gc_tracer); | |
609 void trace_heap_after_gc(GCTracer* gc_tracer); | |
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610 |
0 | 611 // Heap verification |
6008 | 612 virtual void verify(bool silent, VerifyOption option) = 0; |
0 | 613 |
614 // Non product verification and debugging. | |
615 #ifndef PRODUCT | |
616 // Support for PromotionFailureALot. Return true if it's time to cause a | |
617 // promotion failure. The no-argument version uses | |
618 // this->_promotion_failure_alot_count as the counter. | |
619 inline bool promotion_should_fail(volatile size_t* count); | |
620 inline bool promotion_should_fail(); | |
621 | |
622 // Reset the PromotionFailureALot counters. Should be called at the end of a | |
10405 | 623 // GC in which promotion failure occurred. |
0 | 624 inline void reset_promotion_should_fail(volatile size_t* count); |
625 inline void reset_promotion_should_fail(); | |
626 #endif // #ifndef PRODUCT | |
627 | |
628 #ifdef ASSERT | |
629 static int fired_fake_oom() { | |
630 return (CIFireOOMAt > 1 && _fire_out_of_memory_count >= CIFireOOMAt); | |
631 } | |
632 #endif | |
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633 |
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634 public: |
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635 // This is a convenience method that is used in cases where |
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636 // the actual number of GC worker threads is not pertinent but |
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637 // only whether there more than 0. Use of this method helps |
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638 // reduce the occurrence of ParallelGCThreads to uses where the |
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639 // actual number may be germane. |
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640 static bool use_parallel_gc_threads() { return ParallelGCThreads > 0; } |
4708 | 641 |
642 /////////////// Unit tests /////////////// | |
643 | |
644 NOT_PRODUCT(static void test_is_in();) | |
0 | 645 }; |
646 | |
647 // Class to set and reset the GC cause for a CollectedHeap. | |
648 | |
649 class GCCauseSetter : StackObj { | |
650 CollectedHeap* _heap; | |
651 GCCause::Cause _previous_cause; | |
652 public: | |
653 GCCauseSetter(CollectedHeap* heap, GCCause::Cause cause) { | |
654 assert(SafepointSynchronize::is_at_safepoint(), | |
655 "This method manipulates heap state without locking"); | |
656 _heap = heap; | |
657 _previous_cause = _heap->gc_cause(); | |
658 _heap->set_gc_cause(cause); | |
659 } | |
660 | |
661 ~GCCauseSetter() { | |
662 assert(SafepointSynchronize::is_at_safepoint(), | |
663 "This method manipulates heap state without locking"); | |
664 _heap->set_gc_cause(_previous_cause); | |
665 } | |
666 }; | |
1972 | 667 |
668 #endif // SHARE_VM_GC_INTERFACE_COLLECTEDHEAP_HPP |