Mercurial > hg > truffle
annotate src/share/vm/gc_interface/collectedHeap.hpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | d2a62e0f25eb |
| children | 59c790074993 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_GC_INTERFACE_COLLECTEDHEAP_HPP |
| 26 #define SHARE_VM_GC_INTERFACE_COLLECTEDHEAP_HPP | |
| 27 | |
| 28 #include "gc_interface/gcCause.hpp" | |
| 29 #include "memory/allocation.hpp" | |
| 30 #include "memory/barrierSet.hpp" | |
| 31 #include "runtime/handles.hpp" | |
| 32 #include "runtime/perfData.hpp" | |
| 33 #include "runtime/safepoint.hpp" | |
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34 #include "utilities/events.hpp" |
| 1972 | 35 |
| 0 | 36 // A "CollectedHeap" is an implementation of a java heap for HotSpot. This |
| 37 // is an abstract class: there may be many different kinds of heaps. This | |
| 38 // class defines the functions that a heap must implement, and contains | |
| 39 // infrastructure common to all heaps. | |
| 40 | |
| 41 class BarrierSet; | |
| 42 class ThreadClosure; | |
| 43 class AdaptiveSizePolicy; | |
| 44 class Thread; | |
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45 class CollectorPolicy; |
| 0 | 46 |
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47 class GCMessage : public FormatBuffer<1024> { |
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48 public: |
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49 bool is_before; |
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50 |
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51 public: |
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52 GCMessage() {} |
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53 }; |
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54 |
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55 class GCHeapLog : public EventLogBase<GCMessage> { |
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56 private: |
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57 void log_heap(bool before); |
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58 |
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59 public: |
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60 GCHeapLog() : EventLogBase<GCMessage>("GC Heap History") {} |
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61 |
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62 void log_heap_before() { |
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63 log_heap(true); |
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64 } |
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65 void log_heap_after() { |
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66 log_heap(false); |
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67 } |
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68 }; |
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69 |
| 0 | 70 // |
| 71 // CollectedHeap | |
| 72 // SharedHeap | |
| 73 // GenCollectedHeap | |
| 74 // G1CollectedHeap | |
| 75 // ParallelScavengeHeap | |
| 76 // | |
| 6197 | 77 class CollectedHeap : public CHeapObj<mtInternal> { |
| 0 | 78 friend class VMStructs; |
| 79 friend class IsGCActiveMark; // Block structured external access to _is_gc_active | |
| 80 | |
| 81 #ifdef ASSERT | |
| 82 static int _fire_out_of_memory_count; | |
| 83 #endif | |
| 84 | |
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85 // Used for filler objects (static, but initialized in ctor). |
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86 static size_t _filler_array_max_size; |
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87 |
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88 GCHeapLog* _gc_heap_log; |
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89 |
| 1166 | 90 // Used in support of ReduceInitialCardMarks; only consulted if COMPILER2 is being used |
| 91 bool _defer_initial_card_mark; | |
| 92 | |
| 0 | 93 protected: |
| 94 MemRegion _reserved; | |
| 95 BarrierSet* _barrier_set; | |
| 96 bool _is_gc_active; | |
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97 uint _n_par_threads; |
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98 |
| 0 | 99 unsigned int _total_collections; // ... started |
| 100 unsigned int _total_full_collections; // ... started | |
| 101 NOT_PRODUCT(volatile size_t _promotion_failure_alot_count;) | |
| 102 NOT_PRODUCT(volatile size_t _promotion_failure_alot_gc_number;) | |
| 103 | |
| 104 // Reason for current garbage collection. Should be set to | |
| 105 // a value reflecting no collection between collections. | |
| 106 GCCause::Cause _gc_cause; | |
| 107 GCCause::Cause _gc_lastcause; | |
| 108 PerfStringVariable* _perf_gc_cause; | |
| 109 PerfStringVariable* _perf_gc_lastcause; | |
| 110 | |
| 111 // Constructor | |
| 112 CollectedHeap(); | |
| 113 | |
| 1166 | 114 // Do common initializations that must follow instance construction, |
| 115 // for example, those needing virtual calls. | |
| 116 // This code could perhaps be moved into initialize() but would | |
| 117 // be slightly more awkward because we want the latter to be a | |
| 118 // pure virtual. | |
| 119 void pre_initialize(); | |
| 120 | |
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121 // Create a new tlab. All TLAB allocations must go through this. |
| 0 | 122 virtual HeapWord* allocate_new_tlab(size_t size); |
| 123 | |
| 124 // Accumulate statistics on all tlabs. | |
| 125 virtual void accumulate_statistics_all_tlabs(); | |
| 126 | |
| 127 // Reinitialize tlabs before resuming mutators. | |
| 128 virtual void resize_all_tlabs(); | |
| 129 | |
| 130 // Allocate from the current thread's TLAB, with broken-out slow path. | |
| 131 inline static HeapWord* allocate_from_tlab(Thread* thread, size_t size); | |
| 132 static HeapWord* allocate_from_tlab_slow(Thread* thread, size_t size); | |
| 133 | |
| 134 // Allocate an uninitialized block of the given size, or returns NULL if | |
| 135 // this is impossible. | |
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136 inline static HeapWord* common_mem_allocate_noinit(size_t size, TRAPS); |
| 0 | 137 |
| 138 // Like allocate_init, but the block returned by a successful allocation | |
| 139 // is guaranteed initialized to zeros. | |
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140 inline static HeapWord* common_mem_allocate_init(size_t size, TRAPS); |
| 0 | 141 |
| 142 // Helper functions for (VM) allocation. | |
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143 inline static void post_allocation_setup_common(KlassHandle klass, HeapWord* obj); |
| 0 | 144 inline static void post_allocation_setup_no_klass_install(KlassHandle klass, |
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145 HeapWord* objPtr); |
| 0 | 146 |
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147 inline static void post_allocation_setup_obj(KlassHandle klass, HeapWord* obj); |
| 0 | 148 |
| 149 inline static void post_allocation_setup_array(KlassHandle klass, | |
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150 HeapWord* obj, int length); |
| 0 | 151 |
| 152 // Clears an allocated object. | |
| 153 inline static void init_obj(HeapWord* obj, size_t size); | |
| 154 | |
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155 // Filler object utilities. |
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156 static inline size_t filler_array_hdr_size(); |
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157 static inline size_t filler_array_min_size(); |
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158 |
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159 DEBUG_ONLY(static void fill_args_check(HeapWord* start, size_t words);) |
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160 DEBUG_ONLY(static void zap_filler_array(HeapWord* start, size_t words, bool zap = true);) |
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161 |
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162 // Fill with a single array; caller must ensure filler_array_min_size() <= |
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163 // words <= filler_array_max_size(). |
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164 static inline void fill_with_array(HeapWord* start, size_t words, bool zap = true); |
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165 |
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166 // Fill with a single object (either an int array or a java.lang.Object). |
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167 static inline void fill_with_object_impl(HeapWord* start, size_t words, bool zap = true); |
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168 |
| 0 | 169 // Verification functions |
| 170 virtual void check_for_bad_heap_word_value(HeapWord* addr, size_t size) | |
| 171 PRODUCT_RETURN; | |
| 172 virtual void check_for_non_bad_heap_word_value(HeapWord* addr, size_t size) | |
| 173 PRODUCT_RETURN; | |
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174 debug_only(static void check_for_valid_allocation_state();) |
| 0 | 175 |
| 176 public: | |
| 177 enum Name { | |
| 178 Abstract, | |
| 179 SharedHeap, | |
| 180 GenCollectedHeap, | |
| 181 ParallelScavengeHeap, | |
| 182 G1CollectedHeap | |
| 183 }; | |
| 184 | |
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185 static inline size_t filler_array_max_size() { |
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186 return _filler_array_max_size; |
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187 } |
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188 |
| 0 | 189 virtual CollectedHeap::Name kind() const { return CollectedHeap::Abstract; } |
| 190 | |
| 191 /** | |
| 192 * Returns JNI error code JNI_ENOMEM if memory could not be allocated, | |
| 193 * and JNI_OK on success. | |
| 194 */ | |
| 195 virtual jint initialize() = 0; | |
| 196 | |
| 197 // In many heaps, there will be a need to perform some initialization activities | |
| 198 // after the Universe is fully formed, but before general heap allocation is allowed. | |
| 199 // This is the correct place to place such initialization methods. | |
| 200 virtual void post_initialize() = 0; | |
| 201 | |
| 202 MemRegion reserved_region() const { return _reserved; } | |
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203 address base() const { return (address)reserved_region().start(); } |
| 0 | 204 |
| 205 // Future cleanup here. The following functions should specify bytes or | |
| 206 // heapwords as part of their signature. | |
| 207 virtual size_t capacity() const = 0; | |
| 208 virtual size_t used() const = 0; | |
| 209 | |
| 210 // Return "true" if the part of the heap that allocates Java | |
| 211 // objects has reached the maximal committed limit that it can | |
| 212 // reach, without a garbage collection. | |
| 213 virtual bool is_maximal_no_gc() const = 0; | |
| 214 | |
| 215 // Support for java.lang.Runtime.maxMemory(): return the maximum amount of | |
| 216 // memory that the vm could make available for storing 'normal' java objects. | |
| 217 // This is based on the reserved address space, but should not include space | |
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218 // that the vm uses internally for bookkeeping or temporary storage |
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219 // (e.g., in the case of the young gen, one of the survivor |
| 0 | 220 // spaces). |
| 221 virtual size_t max_capacity() const = 0; | |
| 222 | |
| 223 // Returns "TRUE" if "p" points into the reserved area of the heap. | |
| 224 bool is_in_reserved(const void* p) const { | |
| 225 return _reserved.contains(p); | |
| 226 } | |
| 227 | |
| 228 bool is_in_reserved_or_null(const void* p) const { | |
| 229 return p == NULL || is_in_reserved(p); | |
| 230 } | |
| 231 | |
| 4708 | 232 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
| 233 // Since this method can be expensive in general, we restrict its | |
| 0 | 234 // use to assertion checking only. |
| 235 virtual bool is_in(const void* p) const = 0; | |
| 236 | |
| 237 bool is_in_or_null(const void* p) const { | |
| 238 return p == NULL || is_in(p); | |
| 239 } | |
| 240 | |
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241 bool is_in_place(Metadata** p) { |
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242 return !Universe::heap()->is_in(p); |
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243 } |
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244 bool is_in_place(oop* p) { return Universe::heap()->is_in(p); } |
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245 bool is_in_place(narrowOop* p) { |
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246 oop o = oopDesc::load_decode_heap_oop_not_null(p); |
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247 return Universe::heap()->is_in((const void*)o); |
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248 } |
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249 |
| 0 | 250 // Let's define some terms: a "closed" subset of a heap is one that |
| 251 // | |
| 252 // 1) contains all currently-allocated objects, and | |
| 253 // | |
| 254 // 2) is closed under reference: no object in the closed subset | |
| 255 // references one outside the closed subset. | |
| 256 // | |
| 257 // Membership in a heap's closed subset is useful for assertions. | |
| 258 // Clearly, the entire heap is a closed subset, so the default | |
| 259 // implementation is to use "is_in_reserved". But this may not be too | |
| 260 // liberal to perform useful checking. Also, the "is_in" predicate | |
| 261 // defines a closed subset, but may be too expensive, since "is_in" | |
| 262 // verifies that its argument points to an object head. The | |
| 263 // "closed_subset" method allows a heap to define an intermediate | |
| 264 // predicate, allowing more precise checking than "is_in_reserved" at | |
| 265 // lower cost than "is_in." | |
| 266 | |
| 267 // One important case is a heap composed of disjoint contiguous spaces, | |
| 268 // such as the Garbage-First collector. Such heaps have a convenient | |
| 269 // closed subset consisting of the allocated portions of those | |
| 270 // contiguous spaces. | |
| 271 | |
| 272 // Return "TRUE" iff the given pointer points into the heap's defined | |
| 273 // closed subset (which defaults to the entire heap). | |
| 274 virtual bool is_in_closed_subset(const void* p) const { | |
| 275 return is_in_reserved(p); | |
| 276 } | |
| 277 | |
| 278 bool is_in_closed_subset_or_null(const void* p) const { | |
| 279 return p == NULL || is_in_closed_subset(p); | |
| 280 } | |
| 281 | |
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282 #ifdef ASSERT |
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283 // Returns true if "p" is in the part of the |
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284 // heap being collected. |
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285 virtual bool is_in_partial_collection(const void *p) = 0; |
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286 #endif |
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287 |
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288 // An object is scavengable if its location may move during a scavenge. |
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289 // (A scavenge is a GC which is not a full GC.) |
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290 virtual bool is_scavengable(const void *p) = 0; |
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291 |
| 0 | 292 // Returns "TRUE" if "p" is a method oop in the |
| 293 // current heap, with high probability. This predicate | |
| 294 // is not stable, in general. | |
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295 bool is_valid_method(Method* p) const; |
| 0 | 296 |
| 297 void set_gc_cause(GCCause::Cause v) { | |
| 298 if (UsePerfData) { | |
| 299 _gc_lastcause = _gc_cause; | |
| 300 _perf_gc_lastcause->set_value(GCCause::to_string(_gc_lastcause)); | |
| 301 _perf_gc_cause->set_value(GCCause::to_string(v)); | |
| 302 } | |
| 303 _gc_cause = v; | |
| 304 } | |
| 305 GCCause::Cause gc_cause() { return _gc_cause; } | |
| 306 | |
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307 // Number of threads currently working on GC tasks. |
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308 uint n_par_threads() { return _n_par_threads; } |
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309 |
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310 // May be overridden to set additional parallelism. |
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311 virtual void set_par_threads(uint t) { _n_par_threads = t; }; |
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312 |
| 4009 | 313 // Allocate and initialize instances of Class |
| 314 static oop Class_obj_allocate(KlassHandle klass, int size, KlassHandle real_klass, TRAPS); | |
| 315 | |
| 0 | 316 // General obj/array allocation facilities. |
| 317 inline static oop obj_allocate(KlassHandle klass, int size, TRAPS); | |
| 318 inline static oop array_allocate(KlassHandle klass, int size, int length, TRAPS); | |
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319 inline static oop array_allocate_nozero(KlassHandle klass, int size, int length, TRAPS); |
| 0 | 320 |
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321 inline static void post_allocation_install_obj_klass(KlassHandle klass, |
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322 oop obj); |
| 0 | 323 |
| 324 // Raw memory allocation facilities | |
| 325 // The obj and array allocate methods are covers for these methods. | |
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326 // mem_allocate() should never be |
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327 // called to allocate TLABs, only individual objects. |
| 0 | 328 virtual HeapWord* mem_allocate(size_t size, |
| 329 bool* gc_overhead_limit_was_exceeded) = 0; | |
| 330 | |
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331 // Utilities for turning raw memory into filler objects. |
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332 // |
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333 // min_fill_size() is the smallest region that can be filled. |
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334 // fill_with_objects() can fill arbitrary-sized regions of the heap using |
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335 // multiple objects. fill_with_object() is for regions known to be smaller |
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336 // than the largest array of integers; it uses a single object to fill the |
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337 // region and has slightly less overhead. |
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338 static size_t min_fill_size() { |
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339 return size_t(align_object_size(oopDesc::header_size())); |
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340 } |
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341 |
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342 static void fill_with_objects(HeapWord* start, size_t words, bool zap = true); |
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343 |
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344 static void fill_with_object(HeapWord* start, size_t words, bool zap = true); |
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345 static void fill_with_object(MemRegion region, bool zap = true) { |
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346 fill_with_object(region.start(), region.word_size(), zap); |
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347 } |
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348 static void fill_with_object(HeapWord* start, HeapWord* end, bool zap = true) { |
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349 fill_with_object(start, pointer_delta(end, start), zap); |
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350 } |
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351 |
| 0 | 352 // Some heaps may offer a contiguous region for shared non-blocking |
| 353 // allocation, via inlined code (by exporting the address of the top and | |
| 354 // end fields defining the extent of the contiguous allocation region.) | |
| 355 | |
| 356 // This function returns "true" iff the heap supports this kind of | |
| 357 // allocation. (Default is "no".) | |
| 358 virtual bool supports_inline_contig_alloc() const { | |
| 359 return false; | |
| 360 } | |
| 361 // These functions return the addresses of the fields that define the | |
| 362 // boundaries of the contiguous allocation area. (These fields should be | |
| 363 // physically near to one another.) | |
| 364 virtual HeapWord** top_addr() const { | |
| 365 guarantee(false, "inline contiguous allocation not supported"); | |
| 366 return NULL; | |
| 367 } | |
| 368 virtual HeapWord** end_addr() const { | |
| 369 guarantee(false, "inline contiguous allocation not supported"); | |
| 370 return NULL; | |
| 371 } | |
| 372 | |
| 373 // Some heaps may be in an unparseable state at certain times between | |
| 374 // collections. This may be necessary for efficient implementation of | |
| 375 // certain allocation-related activities. Calling this function before | |
| 376 // attempting to parse a heap ensures that the heap is in a parsable | |
| 377 // state (provided other concurrent activity does not introduce | |
| 378 // unparsability). It is normally expected, therefore, that this | |
| 379 // method is invoked with the world stopped. | |
| 380 // NOTE: if you override this method, make sure you call | |
| 381 // super::ensure_parsability so that the non-generational | |
| 382 // part of the work gets done. See implementation of | |
| 383 // CollectedHeap::ensure_parsability and, for instance, | |
| 384 // that of GenCollectedHeap::ensure_parsability(). | |
| 385 // The argument "retire_tlabs" controls whether existing TLABs | |
| 386 // are merely filled or also retired, thus preventing further | |
| 387 // allocation from them and necessitating allocation of new TLABs. | |
| 388 virtual void ensure_parsability(bool retire_tlabs); | |
| 389 | |
| 390 // Return an estimate of the maximum allocation that could be performed | |
| 391 // without triggering any collection or expansion activity. In a | |
| 392 // generational collector, for example, this is probably the largest | |
| 393 // allocation that could be supported (without expansion) in the youngest | |
| 394 // generation. It is "unsafe" because no locks are taken; the result | |
| 395 // should be treated as an approximation, not a guarantee, for use in | |
| 396 // heuristic resizing decisions. | |
| 397 virtual size_t unsafe_max_alloc() = 0; | |
| 398 | |
| 399 // Section on thread-local allocation buffers (TLABs) | |
| 400 // If the heap supports thread-local allocation buffers, it should override | |
| 401 // the following methods: | |
| 402 // Returns "true" iff the heap supports thread-local allocation buffers. | |
| 403 // The default is "no". | |
| 404 virtual bool supports_tlab_allocation() const { | |
| 405 return false; | |
| 406 } | |
| 407 // The amount of space available for thread-local allocation buffers. | |
| 408 virtual size_t tlab_capacity(Thread *thr) const { | |
| 409 guarantee(false, "thread-local allocation buffers not supported"); | |
| 410 return 0; | |
| 411 } | |
| 412 // An estimate of the maximum allocation that could be performed | |
| 413 // for thread-local allocation buffers without triggering any | |
| 414 // collection or expansion activity. | |
| 415 virtual size_t unsafe_max_tlab_alloc(Thread *thr) const { | |
| 416 guarantee(false, "thread-local allocation buffers not supported"); | |
| 417 return 0; | |
| 418 } | |
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419 |
| 0 | 420 // Can a compiler initialize a new object without store barriers? |
| 421 // This permission only extends from the creation of a new object | |
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422 // via a TLAB up to the first subsequent safepoint. If such permission |
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423 // is granted for this heap type, the compiler promises to call |
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424 // defer_store_barrier() below on any slow path allocation of |
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425 // a new object for which such initializing store barriers will |
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426 // have been elided. |
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427 virtual bool can_elide_tlab_store_barriers() const = 0; |
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428 |
| 0 | 429 // If a compiler is eliding store barriers for TLAB-allocated objects, |
| 430 // there is probably a corresponding slow path which can produce | |
| 431 // an object allocated anywhere. The compiler's runtime support | |
| 432 // promises to call this function on such a slow-path-allocated | |
| 433 // object before performing initializations that have elided | |
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434 // store barriers. Returns new_obj, or maybe a safer copy thereof. |
| 1166 | 435 virtual oop new_store_pre_barrier(JavaThread* thread, oop new_obj); |
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436 |
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437 // Answers whether an initializing store to a new object currently |
| 1166 | 438 // allocated at the given address doesn't need a store |
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439 // barrier. Returns "true" if it doesn't need an initializing |
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440 // store barrier; answers "false" if it does. |
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441 virtual bool can_elide_initializing_store_barrier(oop new_obj) = 0; |
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442 |
| 1166 | 443 // If a compiler is eliding store barriers for TLAB-allocated objects, |
| 444 // we will be informed of a slow-path allocation by a call | |
| 445 // to new_store_pre_barrier() above. Such a call precedes the | |
| 446 // initialization of the object itself, and no post-store-barriers will | |
| 447 // be issued. Some heap types require that the barrier strictly follows | |
| 448 // the initializing stores. (This is currently implemented by deferring the | |
| 449 // barrier until the next slow-path allocation or gc-related safepoint.) | |
| 450 // This interface answers whether a particular heap type needs the card | |
| 451 // mark to be thus strictly sequenced after the stores. | |
| 452 virtual bool card_mark_must_follow_store() const = 0; | |
| 453 | |
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454 // If the CollectedHeap was asked to defer a store barrier above, |
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455 // this informs it to flush such a deferred store barrier to the |
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456 // remembered set. |
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457 virtual void flush_deferred_store_barrier(JavaThread* thread); |
| 0 | 458 |
| 459 // Does this heap support heap inspection (+PrintClassHistogram?) | |
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460 virtual bool supports_heap_inspection() const = 0; |
| 0 | 461 |
| 462 // Perform a collection of the heap; intended for use in implementing | |
| 463 // "System.gc". This probably implies as full a collection as the | |
| 464 // "CollectedHeap" supports. | |
| 465 virtual void collect(GCCause::Cause cause) = 0; | |
| 466 | |
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467 // Perform a full collection |
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468 virtual void do_full_collection(bool clear_all_soft_refs) = 0; |
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469 |
| 0 | 470 // This interface assumes that it's being called by the |
| 471 // vm thread. It collects the heap assuming that the | |
| 472 // heap lock is already held and that we are executing in | |
| 473 // the context of the vm thread. | |
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474 virtual void collect_as_vm_thread(GCCause::Cause cause); |
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475 |
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476 // Callback from VM_CollectForMetadataAllocation operation. |
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477 MetaWord* satisfy_failed_metadata_allocation(ClassLoaderData* loader_data, |
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478 size_t size, |
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479 Metaspace::MetadataType mdtype); |
| 0 | 480 |
| 481 // Returns the barrier set for this heap | |
| 482 BarrierSet* barrier_set() { return _barrier_set; } | |
| 483 | |
| 484 // Returns "true" iff there is a stop-world GC in progress. (I assume | |
| 485 // that it should answer "false" for the concurrent part of a concurrent | |
| 486 // collector -- dld). | |
| 487 bool is_gc_active() const { return _is_gc_active; } | |
| 488 | |
| 489 // Total number of GC collections (started) | |
| 490 unsigned int total_collections() const { return _total_collections; } | |
| 491 unsigned int total_full_collections() const { return _total_full_collections;} | |
| 492 | |
| 493 // Increment total number of GC collections (started) | |
| 494 // Should be protected but used by PSMarkSweep - cleanup for 1.4.2 | |
| 495 void increment_total_collections(bool full = false) { | |
| 496 _total_collections++; | |
| 497 if (full) { | |
| 498 increment_total_full_collections(); | |
| 499 } | |
| 500 } | |
| 501 | |
| 502 void increment_total_full_collections() { _total_full_collections++; } | |
| 503 | |
| 504 // Return the AdaptiveSizePolicy for the heap. | |
| 505 virtual AdaptiveSizePolicy* size_policy() = 0; | |
| 506 | |
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507 // Return the CollectorPolicy for the heap |
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508 virtual CollectorPolicy* collector_policy() const = 0; |
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509 |
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510 void oop_iterate_no_header(OopClosure* cl); |
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511 |
| 0 | 512 // Iterate over all the ref-containing fields of all objects, calling |
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513 // "cl.do_oop" on each. |
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514 virtual void oop_iterate(ExtendedOopClosure* cl) = 0; |
| 0 | 515 |
| 516 // Iterate over all objects, calling "cl.do_object" on each. | |
| 517 virtual void object_iterate(ObjectClosure* cl) = 0; | |
| 518 | |
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519 // Similar to object_iterate() except iterates only |
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520 // over live objects. |
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521 virtual void safe_object_iterate(ObjectClosure* cl) = 0; |
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522 |
| 0 | 523 // NOTE! There is no requirement that a collector implement these |
| 524 // functions. | |
| 525 // | |
| 526 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
| 527 // each address in the (reserved) heap is a member of exactly | |
| 528 // one block. The defining characteristic of a block is that it is | |
| 529 // possible to find its size, and thus to progress forward to the next | |
| 530 // block. (Blocks may be of different sizes.) Thus, blocks may | |
| 531 // represent Java objects, or they might be free blocks in a | |
| 532 // free-list-based heap (or subheap), as long as the two kinds are | |
| 533 // distinguishable and the size of each is determinable. | |
| 534 | |
| 535 // Returns the address of the start of the "block" that contains the | |
| 536 // address "addr". We say "blocks" instead of "object" since some heaps | |
| 537 // may not pack objects densely; a chunk may either be an object or a | |
| 538 // non-object. | |
| 539 virtual HeapWord* block_start(const void* addr) const = 0; | |
| 540 | |
| 541 // Requires "addr" to be the start of a chunk, and returns its size. | |
| 542 // "addr + size" is required to be the start of a new chunk, or the end | |
| 543 // of the active area of the heap. | |
| 544 virtual size_t block_size(const HeapWord* addr) const = 0; | |
| 545 | |
| 546 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
| 547 // the block is an object. | |
| 548 virtual bool block_is_obj(const HeapWord* addr) const = 0; | |
| 549 | |
| 550 // Returns the longest time (in ms) that has elapsed since the last | |
| 551 // time that any part of the heap was examined by a garbage collection. | |
| 552 virtual jlong millis_since_last_gc() = 0; | |
| 553 | |
| 554 // Perform any cleanup actions necessary before allowing a verification. | |
| 555 virtual void prepare_for_verify() = 0; | |
| 556 | |
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557 // Generate any dumps preceding or following a full gc |
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558 void pre_full_gc_dump(); |
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559 void post_full_gc_dump(); |
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560 |
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561 // Print heap information on the given outputStream. |
| 0 | 562 virtual void print_on(outputStream* st) const = 0; |
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563 // The default behavior is to call print_on() on tty. |
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564 virtual void print() const { |
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565 print_on(tty); |
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566 } |
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567 // Print more detailed heap information on the given |
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568 // outputStream. The default behaviour is to call print_on(). It is |
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569 // up to each subclass to override it and add any additional output |
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570 // it needs. |
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571 virtual void print_extended_on(outputStream* st) const { |
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572 print_on(st); |
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573 } |
| 0 | 574 |
| 575 // Print all GC threads (other than the VM thread) | |
| 576 // used by this heap. | |
| 577 virtual void print_gc_threads_on(outputStream* st) const = 0; | |
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578 // The default behavior is to call print_gc_threads_on() on tty. |
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579 void print_gc_threads() { |
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580 print_gc_threads_on(tty); |
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581 } |
| 0 | 582 // Iterator for all GC threads (other than VM thread) |
| 583 virtual void gc_threads_do(ThreadClosure* tc) const = 0; | |
| 584 | |
| 585 // Print any relevant tracing info that flags imply. | |
| 586 // Default implementation does nothing. | |
| 587 virtual void print_tracing_info() const = 0; | |
| 588 | |
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589 // If PrintHeapAtGC is set call the appropriate routi |
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590 void print_heap_before_gc() { |
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591 if (PrintHeapAtGC) { |
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592 Universe::print_heap_before_gc(); |
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593 } |
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594 if (_gc_heap_log != NULL) { |
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595 _gc_heap_log->log_heap_before(); |
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596 } |
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597 } |
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598 void print_heap_after_gc() { |
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599 if (PrintHeapAtGC) { |
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600 Universe::print_heap_after_gc(); |
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601 } |
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602 if (_gc_heap_log != NULL) { |
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603 _gc_heap_log->log_heap_after(); |
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604 } |
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605 } |
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606 |
| 0 | 607 // Heap verification |
| 6008 | 608 virtual void verify(bool silent, VerifyOption option) = 0; |
| 0 | 609 |
| 610 // Non product verification and debugging. | |
| 611 #ifndef PRODUCT | |
| 612 // Support for PromotionFailureALot. Return true if it's time to cause a | |
| 613 // promotion failure. The no-argument version uses | |
| 614 // this->_promotion_failure_alot_count as the counter. | |
| 615 inline bool promotion_should_fail(volatile size_t* count); | |
| 616 inline bool promotion_should_fail(); | |
| 617 | |
| 618 // Reset the PromotionFailureALot counters. Should be called at the end of a | |
| 619 // GC in which promotion failure ocurred. | |
| 620 inline void reset_promotion_should_fail(volatile size_t* count); | |
| 621 inline void reset_promotion_should_fail(); | |
| 622 #endif // #ifndef PRODUCT | |
| 623 | |
| 624 #ifdef ASSERT | |
| 625 static int fired_fake_oom() { | |
| 626 return (CIFireOOMAt > 1 && _fire_out_of_memory_count >= CIFireOOMAt); | |
| 627 } | |
| 628 #endif | |
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629 |
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630 public: |
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631 // This is a convenience method that is used in cases where |
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632 // the actual number of GC worker threads is not pertinent but |
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633 // only whether there more than 0. Use of this method helps |
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634 // reduce the occurrence of ParallelGCThreads to uses where the |
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635 // actual number may be germane. |
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636 static bool use_parallel_gc_threads() { return ParallelGCThreads > 0; } |
| 4708 | 637 |
| 638 /////////////// Unit tests /////////////// | |
| 639 | |
| 640 NOT_PRODUCT(static void test_is_in();) | |
| 0 | 641 }; |
| 642 | |
| 643 // Class to set and reset the GC cause for a CollectedHeap. | |
| 644 | |
| 645 class GCCauseSetter : StackObj { | |
| 646 CollectedHeap* _heap; | |
| 647 GCCause::Cause _previous_cause; | |
| 648 public: | |
| 649 GCCauseSetter(CollectedHeap* heap, GCCause::Cause cause) { | |
| 650 assert(SafepointSynchronize::is_at_safepoint(), | |
| 651 "This method manipulates heap state without locking"); | |
| 652 _heap = heap; | |
| 653 _previous_cause = _heap->gc_cause(); | |
| 654 _heap->set_gc_cause(cause); | |
| 655 } | |
| 656 | |
| 657 ~GCCauseSetter() { | |
| 658 assert(SafepointSynchronize::is_at_safepoint(), | |
| 659 "This method manipulates heap state without locking"); | |
| 660 _heap->set_gc_cause(_previous_cause); | |
| 661 } | |
| 662 }; | |
| 1972 | 663 |
| 664 #endif // SHARE_VM_GC_INTERFACE_COLLECTEDHEAP_HPP |