Mercurial > hg > truffle
annotate src/share/vm/gc_interface/collectedHeap.hpp @ 12355:cefad50507d8
Merge with hs25-b53
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Fri, 11 Oct 2013 10:38:03 +0200 |
| parents | b95d42fdddca 5888334c9c24 |
| children | ae412befde21 |
| rev | line source |
|---|---|
| 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; |
| 12080 | 52 class nmethod; |
| 0 | 53 |
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54 class GCMessage : public FormatBuffer<1024> { |
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55 public: |
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56 bool is_before; |
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57 |
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58 public: |
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59 GCMessage() {} |
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60 }; |
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61 |
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62 class GCHeapLog : public EventLogBase<GCMessage> { |
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63 private: |
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64 void log_heap(bool before); |
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65 |
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66 public: |
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67 GCHeapLog() : EventLogBase<GCMessage>("GC Heap History") {} |
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68 |
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69 void log_heap_before() { |
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70 log_heap(true); |
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71 } |
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72 void log_heap_after() { |
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73 log_heap(false); |
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74 } |
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75 }; |
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76 |
| 0 | 77 // |
| 78 // CollectedHeap | |
| 79 // SharedHeap | |
| 80 // GenCollectedHeap | |
| 81 // G1CollectedHeap | |
| 82 // ParallelScavengeHeap | |
| 83 // | |
| 6197 | 84 class CollectedHeap : public CHeapObj<mtInternal> { |
| 0 | 85 friend class VMStructs; |
| 86 friend class IsGCActiveMark; // Block structured external access to _is_gc_active | |
| 87 | |
| 88 #ifdef ASSERT | |
| 89 static int _fire_out_of_memory_count; | |
| 90 #endif | |
| 91 | |
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92 // Used for filler objects (static, but initialized in ctor). |
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93 static size_t _filler_array_max_size; |
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94 |
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95 GCHeapLog* _gc_heap_log; |
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96 |
| 1166 | 97 // Used in support of ReduceInitialCardMarks; only consulted if COMPILER2 is being used |
| 98 bool _defer_initial_card_mark; | |
| 99 | |
| 0 | 100 protected: |
| 101 MemRegion _reserved; | |
| 102 BarrierSet* _barrier_set; | |
| 103 bool _is_gc_active; | |
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104 uint _n_par_threads; |
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105 |
| 0 | 106 unsigned int _total_collections; // ... started |
| 107 unsigned int _total_full_collections; // ... started | |
| 108 NOT_PRODUCT(volatile size_t _promotion_failure_alot_count;) | |
| 109 NOT_PRODUCT(volatile size_t _promotion_failure_alot_gc_number;) | |
| 110 | |
| 111 // Reason for current garbage collection. Should be set to | |
| 112 // a value reflecting no collection between collections. | |
| 113 GCCause::Cause _gc_cause; | |
| 114 GCCause::Cause _gc_lastcause; | |
| 115 PerfStringVariable* _perf_gc_cause; | |
| 116 PerfStringVariable* _perf_gc_lastcause; | |
| 117 | |
| 118 // Constructor | |
| 119 CollectedHeap(); | |
| 120 | |
| 1166 | 121 // Do common initializations that must follow instance construction, |
| 122 // for example, those needing virtual calls. | |
| 123 // This code could perhaps be moved into initialize() but would | |
| 124 // be slightly more awkward because we want the latter to be a | |
| 125 // pure virtual. | |
| 126 void pre_initialize(); | |
| 127 | |
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128 // Create a new tlab. All TLAB allocations must go through this. |
| 0 | 129 virtual HeapWord* allocate_new_tlab(size_t size); |
| 130 | |
| 131 // Accumulate statistics on all tlabs. | |
| 132 virtual void accumulate_statistics_all_tlabs(); | |
| 133 | |
| 134 // Reinitialize tlabs before resuming mutators. | |
| 135 virtual void resize_all_tlabs(); | |
| 136 | |
| 137 // Allocate from the current thread's TLAB, with broken-out slow path. | |
| 10405 | 138 inline static HeapWord* allocate_from_tlab(KlassHandle klass, Thread* thread, size_t size); |
| 139 static HeapWord* allocate_from_tlab_slow(KlassHandle klass, Thread* thread, size_t size); | |
| 0 | 140 |
| 141 // Allocate an uninitialized block of the given size, or returns NULL if | |
| 142 // this is impossible. | |
| 10405 | 143 inline static HeapWord* common_mem_allocate_noinit(KlassHandle klass, size_t size, TRAPS); |
| 0 | 144 |
| 145 // Like allocate_init, but the block returned by a successful allocation | |
| 146 // is guaranteed initialized to zeros. | |
| 10405 | 147 inline static HeapWord* common_mem_allocate_init(KlassHandle klass, size_t size, TRAPS); |
| 0 | 148 |
| 149 // Helper functions for (VM) allocation. | |
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150 inline static void post_allocation_setup_common(KlassHandle klass, HeapWord* obj); |
| 0 | 151 inline static void post_allocation_setup_no_klass_install(KlassHandle klass, |
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152 HeapWord* objPtr); |
| 0 | 153 |
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154 inline static void post_allocation_setup_obj(KlassHandle klass, HeapWord* obj); |
| 0 | 155 |
| 156 inline static void post_allocation_setup_array(KlassHandle klass, | |
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157 HeapWord* obj, int length); |
| 0 | 158 |
| 159 // Clears an allocated object. | |
| 160 inline static void init_obj(HeapWord* obj, size_t size); | |
| 161 | |
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162 // Filler object utilities. |
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163 static inline size_t filler_array_hdr_size(); |
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164 static inline size_t filler_array_min_size(); |
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165 |
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166 DEBUG_ONLY(static void fill_args_check(HeapWord* start, size_t words);) |
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167 DEBUG_ONLY(static void zap_filler_array(HeapWord* start, size_t words, bool zap = true);) |
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168 |
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169 // Fill with a single array; caller must ensure filler_array_min_size() <= |
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170 // words <= filler_array_max_size(). |
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171 static inline void fill_with_array(HeapWord* start, size_t words, bool zap = true); |
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172 |
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173 // Fill with a single object (either an int array or a java.lang.Object). |
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174 static inline void fill_with_object_impl(HeapWord* start, size_t words, bool zap = true); |
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175 |
| 10405 | 176 virtual void trace_heap(GCWhen::Type when, GCTracer* tracer); |
| 177 | |
| 0 | 178 // Verification functions |
| 179 virtual void check_for_bad_heap_word_value(HeapWord* addr, size_t size) | |
| 180 PRODUCT_RETURN; | |
| 181 virtual void check_for_non_bad_heap_word_value(HeapWord* addr, size_t size) | |
| 182 PRODUCT_RETURN; | |
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183 debug_only(static void check_for_valid_allocation_state();) |
| 0 | 184 |
| 185 public: | |
| 186 enum Name { | |
| 187 Abstract, | |
| 188 SharedHeap, | |
| 189 GenCollectedHeap, | |
| 190 ParallelScavengeHeap, | |
| 191 G1CollectedHeap | |
| 192 }; | |
| 193 | |
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194 static inline size_t filler_array_max_size() { |
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195 return _filler_array_max_size; |
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196 } |
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197 |
| 0 | 198 virtual CollectedHeap::Name kind() const { return CollectedHeap::Abstract; } |
| 199 | |
| 200 /** | |
| 201 * Returns JNI error code JNI_ENOMEM if memory could not be allocated, | |
| 202 * and JNI_OK on success. | |
| 203 */ | |
| 204 virtual jint initialize() = 0; | |
| 205 | |
| 206 // In many heaps, there will be a need to perform some initialization activities | |
| 207 // after the Universe is fully formed, but before general heap allocation is allowed. | |
| 208 // This is the correct place to place such initialization methods. | |
| 209 virtual void post_initialize() = 0; | |
| 210 | |
| 211 MemRegion reserved_region() const { return _reserved; } | |
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212 address base() const { return (address)reserved_region().start(); } |
| 0 | 213 |
| 214 virtual size_t capacity() const = 0; | |
| 215 virtual size_t used() const = 0; | |
| 216 | |
| 217 // Return "true" if the part of the heap that allocates Java | |
| 218 // objects has reached the maximal committed limit that it can | |
| 219 // reach, without a garbage collection. | |
| 220 virtual bool is_maximal_no_gc() const = 0; | |
| 221 | |
| 222 // Support for java.lang.Runtime.maxMemory(): return the maximum amount of | |
| 223 // memory that the vm could make available for storing 'normal' java objects. | |
| 224 // This is based on the reserved address space, but should not include space | |
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225 // that the vm uses internally for bookkeeping or temporary storage |
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226 // (e.g., in the case of the young gen, one of the survivor |
| 0 | 227 // spaces). |
| 228 virtual size_t max_capacity() const = 0; | |
| 229 | |
| 230 // Returns "TRUE" if "p" points into the reserved area of the heap. | |
| 231 bool is_in_reserved(const void* p) const { | |
| 232 return _reserved.contains(p); | |
| 233 } | |
| 234 | |
| 235 bool is_in_reserved_or_null(const void* p) const { | |
| 236 return p == NULL || is_in_reserved(p); | |
| 237 } | |
| 238 | |
| 4708 | 239 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
| 240 // Since this method can be expensive in general, we restrict its | |
| 0 | 241 // use to assertion checking only. |
| 242 virtual bool is_in(const void* p) const = 0; | |
| 243 | |
| 244 bool is_in_or_null(const void* p) const { | |
| 245 return p == NULL || is_in(p); | |
| 246 } | |
| 247 | |
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248 bool is_in_place(Metadata** p) { |
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249 return !Universe::heap()->is_in(p); |
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250 } |
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251 bool is_in_place(oop* p) { return Universe::heap()->is_in(p); } |
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252 bool is_in_place(narrowOop* p) { |
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253 oop o = oopDesc::load_decode_heap_oop_not_null(p); |
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254 return Universe::heap()->is_in((const void*)o); |
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255 } |
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256 |
| 0 | 257 // Let's define some terms: a "closed" subset of a heap is one that |
| 258 // | |
| 259 // 1) contains all currently-allocated objects, and | |
| 260 // | |
| 261 // 2) is closed under reference: no object in the closed subset | |
| 262 // references one outside the closed subset. | |
| 263 // | |
| 264 // Membership in a heap's closed subset is useful for assertions. | |
| 265 // Clearly, the entire heap is a closed subset, so the default | |
| 266 // implementation is to use "is_in_reserved". But this may not be too | |
| 267 // liberal to perform useful checking. Also, the "is_in" predicate | |
| 268 // defines a closed subset, but may be too expensive, since "is_in" | |
| 269 // verifies that its argument points to an object head. The | |
| 270 // "closed_subset" method allows a heap to define an intermediate | |
| 271 // predicate, allowing more precise checking than "is_in_reserved" at | |
| 272 // lower cost than "is_in." | |
| 273 | |
| 274 // One important case is a heap composed of disjoint contiguous spaces, | |
| 275 // such as the Garbage-First collector. Such heaps have a convenient | |
| 276 // closed subset consisting of the allocated portions of those | |
| 277 // contiguous spaces. | |
| 278 | |
| 279 // Return "TRUE" iff the given pointer points into the heap's defined | |
| 280 // closed subset (which defaults to the entire heap). | |
| 281 virtual bool is_in_closed_subset(const void* p) const { | |
| 282 return is_in_reserved(p); | |
| 283 } | |
| 284 | |
| 285 bool is_in_closed_subset_or_null(const void* p) const { | |
| 286 return p == NULL || is_in_closed_subset(p); | |
| 287 } | |
| 288 | |
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289 #ifdef ASSERT |
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290 // Returns true if "p" is in the part of the |
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291 // heap being collected. |
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292 virtual bool is_in_partial_collection(const void *p) = 0; |
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293 #endif |
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294 |
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295 // An object is scavengable if its location may move during a scavenge. |
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296 // (A scavenge is a GC which is not a full GC.) |
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297 virtual bool is_scavengable(const void *p) = 0; |
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298 |
| 0 | 299 void set_gc_cause(GCCause::Cause v) { |
| 300 if (UsePerfData) { | |
| 301 _gc_lastcause = _gc_cause; | |
| 302 _perf_gc_lastcause->set_value(GCCause::to_string(_gc_lastcause)); | |
| 303 _perf_gc_cause->set_value(GCCause::to_string(v)); | |
| 304 } | |
| 305 _gc_cause = v; | |
| 306 } | |
| 307 GCCause::Cause gc_cause() { return _gc_cause; } | |
| 308 | |
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309 // Number of threads currently working on GC tasks. |
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310 uint n_par_threads() { return _n_par_threads; } |
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311 |
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312 // May be overridden to set additional parallelism. |
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313 virtual void set_par_threads(uint t) { _n_par_threads = t; }; |
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314 |
| 4009 | 315 // Allocate and initialize instances of Class |
| 316 static oop Class_obj_allocate(KlassHandle klass, int size, KlassHandle real_klass, TRAPS); | |
| 317 | |
| 0 | 318 // General obj/array allocation facilities. |
| 319 inline static oop obj_allocate(KlassHandle klass, int size, TRAPS); | |
| 320 inline static oop array_allocate(KlassHandle klass, int size, int length, TRAPS); | |
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321 inline static oop array_allocate_nozero(KlassHandle klass, int size, int length, TRAPS); |
| 0 | 322 |
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323 inline static void post_allocation_install_obj_klass(KlassHandle klass, |
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324 oop obj); |
| 0 | 325 |
| 326 // Raw memory allocation facilities | |
| 327 // The obj and array allocate methods are covers for these methods. | |
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328 // mem_allocate() should never be |
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329 // called to allocate TLABs, only individual objects. |
| 0 | 330 virtual HeapWord* mem_allocate(size_t size, |
| 331 bool* gc_overhead_limit_was_exceeded) = 0; | |
| 332 | |
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333 // Utilities for turning raw memory into filler objects. |
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334 // |
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335 // min_fill_size() is the smallest region that can be filled. |
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336 // fill_with_objects() can fill arbitrary-sized regions of the heap using |
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337 // multiple objects. fill_with_object() is for regions known to be smaller |
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338 // than the largest array of integers; it uses a single object to fill the |
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339 // region and has slightly less overhead. |
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340 static size_t min_fill_size() { |
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341 return size_t(align_object_size(oopDesc::header_size())); |
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342 } |
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343 |
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344 static void fill_with_objects(HeapWord* start, size_t words, bool zap = true); |
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345 |
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346 static void fill_with_object(HeapWord* start, size_t words, bool zap = true); |
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347 static void fill_with_object(MemRegion region, bool zap = true) { |
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348 fill_with_object(region.start(), region.word_size(), zap); |
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349 } |
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350 static void fill_with_object(HeapWord* start, HeapWord* end, bool zap = true) { |
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351 fill_with_object(start, pointer_delta(end, start), zap); |
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352 } |
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353 |
| 0 | 354 // Some heaps may offer a contiguous region for shared non-blocking |
| 355 // allocation, via inlined code (by exporting the address of the top and | |
| 356 // end fields defining the extent of the contiguous allocation region.) | |
| 357 | |
| 358 // This function returns "true" iff the heap supports this kind of | |
| 359 // allocation. (Default is "no".) | |
| 360 virtual bool supports_inline_contig_alloc() const { | |
| 361 return false; | |
| 362 } | |
| 363 // These functions return the addresses of the fields that define the | |
| 364 // boundaries of the contiguous allocation area. (These fields should be | |
| 365 // physically near to one another.) | |
| 366 virtual HeapWord** top_addr() const { | |
| 367 guarantee(false, "inline contiguous allocation not supported"); | |
| 368 return NULL; | |
| 369 } | |
| 370 virtual HeapWord** end_addr() const { | |
| 371 guarantee(false, "inline contiguous allocation not supported"); | |
| 372 return NULL; | |
| 373 } | |
| 374 | |
| 375 // Some heaps may be in an unparseable state at certain times between | |
| 376 // collections. This may be necessary for efficient implementation of | |
| 377 // certain allocation-related activities. Calling this function before | |
| 378 // attempting to parse a heap ensures that the heap is in a parsable | |
| 379 // state (provided other concurrent activity does not introduce | |
| 380 // unparsability). It is normally expected, therefore, that this | |
| 381 // method is invoked with the world stopped. | |
| 382 // NOTE: if you override this method, make sure you call | |
| 383 // super::ensure_parsability so that the non-generational | |
| 384 // part of the work gets done. See implementation of | |
| 385 // CollectedHeap::ensure_parsability and, for instance, | |
| 386 // that of GenCollectedHeap::ensure_parsability(). | |
| 387 // The argument "retire_tlabs" controls whether existing TLABs | |
| 388 // are merely filled or also retired, thus preventing further | |
| 389 // allocation from them and necessitating allocation of new TLABs. | |
| 390 virtual void ensure_parsability(bool retire_tlabs); | |
| 391 | |
| 392 // Return an estimate of the maximum allocation that could be performed | |
| 393 // without triggering any collection or expansion activity. In a | |
| 394 // generational collector, for example, this is probably the largest | |
| 395 // allocation that could be supported (without expansion) in the youngest | |
| 396 // generation. It is "unsafe" because no locks are taken; the result | |
| 397 // should be treated as an approximation, not a guarantee, for use in | |
| 398 // heuristic resizing decisions. | |
| 399 virtual size_t unsafe_max_alloc() = 0; | |
| 400 | |
| 401 // Section on thread-local allocation buffers (TLABs) | |
| 402 // If the heap supports thread-local allocation buffers, it should override | |
| 403 // the following methods: | |
| 404 // Returns "true" iff the heap supports thread-local allocation buffers. | |
| 405 // The default is "no". | |
| 406 virtual bool supports_tlab_allocation() const { | |
| 407 return false; | |
| 408 } | |
| 409 // The amount of space available for thread-local allocation buffers. | |
| 410 virtual size_t tlab_capacity(Thread *thr) const { | |
| 411 guarantee(false, "thread-local allocation buffers not supported"); | |
| 412 return 0; | |
| 413 } | |
| 414 // An estimate of the maximum allocation that could be performed | |
| 415 // for thread-local allocation buffers without triggering any | |
| 416 // collection or expansion activity. | |
| 417 virtual size_t unsafe_max_tlab_alloc(Thread *thr) const { | |
| 418 guarantee(false, "thread-local allocation buffers not supported"); | |
| 419 return 0; | |
| 420 } | |
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421 |
| 0 | 422 // Can a compiler initialize a new object without store barriers? |
| 423 // This permission only extends from the creation of a new object | |
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424 // via a TLAB up to the first subsequent safepoint. If such permission |
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425 // is granted for this heap type, the compiler promises to call |
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426 // defer_store_barrier() below on any slow path allocation of |
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427 // a new object for which such initializing store barriers will |
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428 // have been elided. |
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429 virtual bool can_elide_tlab_store_barriers() const = 0; |
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430 |
| 0 | 431 // If a compiler is eliding store barriers for TLAB-allocated objects, |
| 432 // there is probably a corresponding slow path which can produce | |
| 433 // an object allocated anywhere. The compiler's runtime support | |
| 434 // promises to call this function on such a slow-path-allocated | |
| 435 // object before performing initializations that have elided | |
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436 // store barriers. Returns new_obj, or maybe a safer copy thereof. |
| 1166 | 437 virtual oop new_store_pre_barrier(JavaThread* thread, oop new_obj); |
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438 |
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439 // Answers whether an initializing store to a new object currently |
| 1166 | 440 // allocated at the given address doesn't need a store |
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441 // barrier. Returns "true" if it doesn't need an initializing |
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442 // store barrier; answers "false" if it does. |
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443 virtual bool can_elide_initializing_store_barrier(oop new_obj) = 0; |
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444 |
| 1166 | 445 // If a compiler is eliding store barriers for TLAB-allocated objects, |
| 446 // we will be informed of a slow-path allocation by a call | |
| 447 // to new_store_pre_barrier() above. Such a call precedes the | |
| 448 // initialization of the object itself, and no post-store-barriers will | |
| 449 // be issued. Some heap types require that the barrier strictly follows | |
| 450 // the initializing stores. (This is currently implemented by deferring the | |
| 451 // barrier until the next slow-path allocation or gc-related safepoint.) | |
| 452 // This interface answers whether a particular heap type needs the card | |
| 453 // mark to be thus strictly sequenced after the stores. | |
| 454 virtual bool card_mark_must_follow_store() const = 0; | |
| 455 | |
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456 // If the CollectedHeap was asked to defer a store barrier above, |
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457 // this informs it to flush such a deferred store barrier to the |
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458 // remembered set. |
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459 virtual void flush_deferred_store_barrier(JavaThread* thread); |
| 0 | 460 |
| 461 // Does this heap support heap inspection (+PrintClassHistogram?) | |
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462 virtual bool supports_heap_inspection() const = 0; |
| 0 | 463 |
| 464 // Perform a collection of the heap; intended for use in implementing | |
| 465 // "System.gc". This probably implies as full a collection as the | |
| 466 // "CollectedHeap" supports. | |
| 467 virtual void collect(GCCause::Cause cause) = 0; | |
| 468 | |
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469 // Perform a full collection |
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470 virtual void do_full_collection(bool clear_all_soft_refs) = 0; |
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471 |
| 0 | 472 // This interface assumes that it's being called by the |
| 473 // vm thread. It collects the heap assuming that the | |
| 474 // heap lock is already held and that we are executing in | |
| 475 // the context of the vm thread. | |
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476 virtual void collect_as_vm_thread(GCCause::Cause cause); |
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477 |
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478 // Callback from VM_CollectForMetadataAllocation operation. |
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479 MetaWord* satisfy_failed_metadata_allocation(ClassLoaderData* loader_data, |
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480 size_t size, |
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481 Metaspace::MetadataType mdtype); |
| 0 | 482 |
| 483 // Returns the barrier set for this heap | |
| 484 BarrierSet* barrier_set() { return _barrier_set; } | |
| 485 | |
| 486 // Returns "true" iff there is a stop-world GC in progress. (I assume | |
| 487 // that it should answer "false" for the concurrent part of a concurrent | |
| 488 // collector -- dld). | |
| 489 bool is_gc_active() const { return _is_gc_active; } | |
| 490 | |
| 491 // Total number of GC collections (started) | |
| 492 unsigned int total_collections() const { return _total_collections; } | |
| 493 unsigned int total_full_collections() const { return _total_full_collections;} | |
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494 #ifdef GRAAL |
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495 unsigned int* total_collections_address() { return &_total_collections;} |
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496 #endif |
| 0 | 497 // Increment total number of GC collections (started) |
| 498 // Should be protected but used by PSMarkSweep - cleanup for 1.4.2 | |
| 499 void increment_total_collections(bool full = false) { | |
| 500 _total_collections++; | |
| 501 if (full) { | |
| 502 increment_total_full_collections(); | |
| 503 } | |
| 504 } | |
| 505 | |
| 506 void increment_total_full_collections() { _total_full_collections++; } | |
| 507 | |
| 508 // Return the AdaptiveSizePolicy for the heap. | |
| 509 virtual AdaptiveSizePolicy* size_policy() = 0; | |
| 510 | |
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511 // Return the CollectorPolicy for the heap |
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512 virtual CollectorPolicy* collector_policy() const = 0; |
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513 |
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514 void oop_iterate_no_header(OopClosure* cl); |
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515 |
| 0 | 516 // Iterate over all the ref-containing fields of all objects, calling |
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517 // "cl.do_oop" on each. |
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518 virtual void oop_iterate(ExtendedOopClosure* cl) = 0; |
| 0 | 519 |
| 520 // Iterate over all objects, calling "cl.do_object" on each. | |
| 521 virtual void object_iterate(ObjectClosure* cl) = 0; | |
| 522 | |
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517
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523 // Similar to object_iterate() except iterates only |
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524 // over live objects. |
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525 virtual void safe_object_iterate(ObjectClosure* cl) = 0; |
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526 |
| 0 | 527 // NOTE! There is no requirement that a collector implement these |
| 528 // functions. | |
| 529 // | |
| 530 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
| 531 // each address in the (reserved) heap is a member of exactly | |
| 532 // one block. The defining characteristic of a block is that it is | |
| 533 // possible to find its size, and thus to progress forward to the next | |
| 534 // block. (Blocks may be of different sizes.) Thus, blocks may | |
| 535 // represent Java objects, or they might be free blocks in a | |
| 536 // free-list-based heap (or subheap), as long as the two kinds are | |
| 537 // distinguishable and the size of each is determinable. | |
| 538 | |
| 539 // Returns the address of the start of the "block" that contains the | |
| 540 // address "addr". We say "blocks" instead of "object" since some heaps | |
| 541 // may not pack objects densely; a chunk may either be an object or a | |
| 542 // non-object. | |
| 543 virtual HeapWord* block_start(const void* addr) const = 0; | |
| 544 | |
| 545 // Requires "addr" to be the start of a chunk, and returns its size. | |
| 546 // "addr + size" is required to be the start of a new chunk, or the end | |
| 547 // of the active area of the heap. | |
| 548 virtual size_t block_size(const HeapWord* addr) const = 0; | |
| 549 | |
| 550 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
| 551 // the block is an object. | |
| 552 virtual bool block_is_obj(const HeapWord* addr) const = 0; | |
| 553 | |
| 554 // Returns the longest time (in ms) that has elapsed since the last | |
| 555 // time that any part of the heap was examined by a garbage collection. | |
| 556 virtual jlong millis_since_last_gc() = 0; | |
| 557 | |
| 558 // Perform any cleanup actions necessary before allowing a verification. | |
| 559 virtual void prepare_for_verify() = 0; | |
| 560 | |
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561 // Generate any dumps preceding or following a full gc |
| 10405 | 562 void pre_full_gc_dump(GCTimer* timer); |
| 563 void post_full_gc_dump(GCTimer* timer); | |
| 564 | |
| 565 VirtualSpaceSummary create_heap_space_summary(); | |
| 566 GCHeapSummary create_heap_summary(); | |
| 567 | |
| 568 MetaspaceSummary create_metaspace_summary(); | |
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569 |
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570 // Print heap information on the given outputStream. |
| 0 | 571 virtual void print_on(outputStream* st) const = 0; |
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572 // The default behavior is to call print_on() on tty. |
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573 virtual void print() const { |
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574 print_on(tty); |
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575 } |
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576 // Print more detailed heap information on the given |
| 10405 | 577 // outputStream. The default behavior is to call print_on(). It is |
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578 // up to each subclass to override it and add any additional output |
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579 // it needs. |
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580 virtual void print_extended_on(outputStream* st) const { |
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581 print_on(st); |
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582 } |
| 0 | 583 |
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584 virtual void print_on_error(outputStream* st) const { |
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585 st->print_cr("Heap:"); |
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586 print_extended_on(st); |
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587 st->cr(); |
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588 |
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589 _barrier_set->print_on(st); |
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590 } |
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591 |
| 0 | 592 // Print all GC threads (other than the VM thread) |
| 593 // used by this heap. | |
| 594 virtual void print_gc_threads_on(outputStream* st) const = 0; | |
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595 // The default behavior is to call print_gc_threads_on() on tty. |
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596 void print_gc_threads() { |
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597 print_gc_threads_on(tty); |
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598 } |
| 0 | 599 // Iterator for all GC threads (other than VM thread) |
| 600 virtual void gc_threads_do(ThreadClosure* tc) const = 0; | |
| 601 | |
| 602 // Print any relevant tracing info that flags imply. | |
| 603 // Default implementation does nothing. | |
| 604 virtual void print_tracing_info() const = 0; | |
| 605 | |
| 10405 | 606 void print_heap_before_gc(); |
| 607 void print_heap_after_gc(); | |
| 608 | |
| 12080 | 609 // Registering and unregistering an nmethod (compiled code) with the heap. |
| 610 // Override with specific mechanism for each specialized heap type. | |
| 611 virtual void register_nmethod(nmethod* nm); | |
| 612 virtual void unregister_nmethod(nmethod* nm); | |
| 613 | |
| 10405 | 614 void trace_heap_before_gc(GCTracer* gc_tracer); |
| 615 void trace_heap_after_gc(GCTracer* gc_tracer); | |
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616 |
| 0 | 617 // Heap verification |
| 6008 | 618 virtual void verify(bool silent, VerifyOption option) = 0; |
| 0 | 619 |
| 620 // Non product verification and debugging. | |
| 621 #ifndef PRODUCT | |
| 622 // Support for PromotionFailureALot. Return true if it's time to cause a | |
| 623 // promotion failure. The no-argument version uses | |
| 624 // this->_promotion_failure_alot_count as the counter. | |
| 625 inline bool promotion_should_fail(volatile size_t* count); | |
| 626 inline bool promotion_should_fail(); | |
| 627 | |
| 628 // Reset the PromotionFailureALot counters. Should be called at the end of a | |
| 10405 | 629 // GC in which promotion failure occurred. |
| 0 | 630 inline void reset_promotion_should_fail(volatile size_t* count); |
| 631 inline void reset_promotion_should_fail(); | |
| 632 #endif // #ifndef PRODUCT | |
| 633 | |
| 634 #ifdef ASSERT | |
| 635 static int fired_fake_oom() { | |
| 636 return (CIFireOOMAt > 1 && _fire_out_of_memory_count >= CIFireOOMAt); | |
| 637 } | |
| 638 #endif | |
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639 |
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640 public: |
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641 // This is a convenience method that is used in cases where |
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642 // the actual number of GC worker threads is not pertinent but |
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643 // only whether there more than 0. Use of this method helps |
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644 // reduce the occurrence of ParallelGCThreads to uses where the |
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645 // actual number may be germane. |
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646 static bool use_parallel_gc_threads() { return ParallelGCThreads > 0; } |
| 4708 | 647 |
| 648 /////////////// Unit tests /////////////// | |
| 649 | |
| 650 NOT_PRODUCT(static void test_is_in();) | |
| 0 | 651 }; |
| 652 | |
| 653 // Class to set and reset the GC cause for a CollectedHeap. | |
| 654 | |
| 655 class GCCauseSetter : StackObj { | |
| 656 CollectedHeap* _heap; | |
| 657 GCCause::Cause _previous_cause; | |
| 658 public: | |
| 659 GCCauseSetter(CollectedHeap* heap, GCCause::Cause cause) { | |
| 660 assert(SafepointSynchronize::is_at_safepoint(), | |
| 661 "This method manipulates heap state without locking"); | |
| 662 _heap = heap; | |
| 663 _previous_cause = _heap->gc_cause(); | |
| 664 _heap->set_gc_cause(cause); | |
| 665 } | |
| 666 | |
| 667 ~GCCauseSetter() { | |
| 668 assert(SafepointSynchronize::is_at_safepoint(), | |
| 669 "This method manipulates heap state without locking"); | |
| 670 _heap->set_gc_cause(_previous_cause); | |
| 671 } | |
| 672 }; | |
| 1972 | 673 |
| 674 #endif // SHARE_VM_GC_INTERFACE_COLLECTEDHEAP_HPP |