Mercurial > hg > graal-compiler
annotate src/share/vm/gc_interface/collectedHeap.hpp @ 4872:aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
Reviewed-by: kvn, jrose, kevinw, brutisso, twisti, jmasa
| author | never |
|---|---|
| date | Wed, 01 Feb 2012 07:59:01 -0800 |
| parents | 441e946dc1af |
| children | cc74fa5a91a9 |
| rev | line source |
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| 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 // | |
| 77 class CollectedHeap : public CHeapObj { | |
| 78 friend class VMStructs; | |
| 79 friend class IsGCActiveMark; // Block structured external access to _is_gc_active | |
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80 friend class constantPoolCacheKlass; // allocate() method inserts is_conc_safe |
| 0 | 81 |
| 82 #ifdef ASSERT | |
| 83 static int _fire_out_of_memory_count; | |
| 84 #endif | |
| 85 | |
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86 // Used for filler objects (static, but initialized in ctor). |
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87 static size_t _filler_array_max_size; |
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88 |
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89 GCHeapLog* _gc_heap_log; |
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90 |
| 1166 | 91 // Used in support of ReduceInitialCardMarks; only consulted if COMPILER2 is being used |
| 92 bool _defer_initial_card_mark; | |
| 93 | |
| 0 | 94 protected: |
| 95 MemRegion _reserved; | |
| 96 BarrierSet* _barrier_set; | |
| 97 bool _is_gc_active; | |
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98 uint _n_par_threads; |
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99 |
| 0 | 100 unsigned int _total_collections; // ... started |
| 101 unsigned int _total_full_collections; // ... started | |
| 102 NOT_PRODUCT(volatile size_t _promotion_failure_alot_count;) | |
| 103 NOT_PRODUCT(volatile size_t _promotion_failure_alot_gc_number;) | |
| 104 | |
| 105 // Reason for current garbage collection. Should be set to | |
| 106 // a value reflecting no collection between collections. | |
| 107 GCCause::Cause _gc_cause; | |
| 108 GCCause::Cause _gc_lastcause; | |
| 109 PerfStringVariable* _perf_gc_cause; | |
| 110 PerfStringVariable* _perf_gc_lastcause; | |
| 111 | |
| 112 // Constructor | |
| 113 CollectedHeap(); | |
| 114 | |
| 1166 | 115 // Do common initializations that must follow instance construction, |
| 116 // for example, those needing virtual calls. | |
| 117 // This code could perhaps be moved into initialize() but would | |
| 118 // be slightly more awkward because we want the latter to be a | |
| 119 // pure virtual. | |
| 120 void pre_initialize(); | |
| 121 | |
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122 // Create a new tlab. All TLAB allocations must go through this. |
| 0 | 123 virtual HeapWord* allocate_new_tlab(size_t size); |
| 124 | |
| 125 // Accumulate statistics on all tlabs. | |
| 126 virtual void accumulate_statistics_all_tlabs(); | |
| 127 | |
| 128 // Reinitialize tlabs before resuming mutators. | |
| 129 virtual void resize_all_tlabs(); | |
| 130 | |
| 131 protected: | |
| 132 // Allocate from the current thread's TLAB, with broken-out slow path. | |
| 133 inline static HeapWord* allocate_from_tlab(Thread* thread, size_t size); | |
| 134 static HeapWord* allocate_from_tlab_slow(Thread* thread, size_t size); | |
| 135 | |
| 136 // Allocate an uninitialized block of the given size, or returns NULL if | |
| 137 // this is impossible. | |
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138 inline static HeapWord* common_mem_allocate_noinit(size_t size, TRAPS); |
| 0 | 139 |
| 140 // Like allocate_init, but the block returned by a successful allocation | |
| 141 // is guaranteed initialized to zeros. | |
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142 inline static HeapWord* common_mem_allocate_init(size_t size, TRAPS); |
| 0 | 143 |
| 144 // Same as common_mem version, except memory is allocated in the permanent area | |
| 145 // If there is no permanent area, revert to common_mem_allocate_noinit | |
| 146 inline static HeapWord* common_permanent_mem_allocate_noinit(size_t size, TRAPS); | |
| 147 | |
| 148 // Same as common_mem version, except memory is allocated in the permanent area | |
| 149 // If there is no permanent area, revert to common_mem_allocate_init | |
| 150 inline static HeapWord* common_permanent_mem_allocate_init(size_t size, TRAPS); | |
| 151 | |
| 152 // Helper functions for (VM) allocation. | |
| 153 inline static void post_allocation_setup_common(KlassHandle klass, | |
| 154 HeapWord* obj, size_t size); | |
| 155 inline static void post_allocation_setup_no_klass_install(KlassHandle klass, | |
| 156 HeapWord* objPtr, | |
| 157 size_t size); | |
| 158 | |
| 159 inline static void post_allocation_setup_obj(KlassHandle klass, | |
| 160 HeapWord* obj, size_t size); | |
| 161 | |
| 162 inline static void post_allocation_setup_array(KlassHandle klass, | |
| 163 HeapWord* obj, size_t size, | |
| 164 int length); | |
| 165 | |
| 166 // Clears an allocated object. | |
| 167 inline static void init_obj(HeapWord* obj, size_t size); | |
| 168 | |
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169 // Filler object utilities. |
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170 static inline size_t filler_array_hdr_size(); |
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171 static inline size_t filler_array_min_size(); |
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172 static inline size_t filler_array_max_size(); |
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173 |
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174 DEBUG_ONLY(static void fill_args_check(HeapWord* start, size_t words);) |
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175 DEBUG_ONLY(static void zap_filler_array(HeapWord* start, size_t words, bool zap = true);) |
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176 |
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177 // Fill with a single array; caller must ensure filler_array_min_size() <= |
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178 // words <= filler_array_max_size(). |
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179 static inline void fill_with_array(HeapWord* start, size_t words, bool zap = true); |
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180 |
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181 // Fill with a single object (either an int array or a java.lang.Object). |
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182 static inline void fill_with_object_impl(HeapWord* start, size_t words, bool zap = true); |
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183 |
| 0 | 184 // Verification functions |
| 185 virtual void check_for_bad_heap_word_value(HeapWord* addr, size_t size) | |
| 186 PRODUCT_RETURN; | |
| 187 virtual void check_for_non_bad_heap_word_value(HeapWord* addr, size_t size) | |
| 188 PRODUCT_RETURN; | |
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189 debug_only(static void check_for_valid_allocation_state();) |
| 0 | 190 |
| 191 public: | |
| 192 enum Name { | |
| 193 Abstract, | |
| 194 SharedHeap, | |
| 195 GenCollectedHeap, | |
| 196 ParallelScavengeHeap, | |
| 197 G1CollectedHeap | |
| 198 }; | |
| 199 | |
| 200 virtual CollectedHeap::Name kind() const { return CollectedHeap::Abstract; } | |
| 201 | |
| 202 /** | |
| 203 * Returns JNI error code JNI_ENOMEM if memory could not be allocated, | |
| 204 * and JNI_OK on success. | |
| 205 */ | |
| 206 virtual jint initialize() = 0; | |
| 207 | |
| 208 // In many heaps, there will be a need to perform some initialization activities | |
| 209 // after the Universe is fully formed, but before general heap allocation is allowed. | |
| 210 // This is the correct place to place such initialization methods. | |
| 211 virtual void post_initialize() = 0; | |
| 212 | |
| 213 MemRegion reserved_region() const { return _reserved; } | |
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214 address base() const { return (address)reserved_region().start(); } |
| 0 | 215 |
| 216 // Future cleanup here. The following functions should specify bytes or | |
| 217 // heapwords as part of their signature. | |
| 218 virtual size_t capacity() const = 0; | |
| 219 virtual size_t used() const = 0; | |
| 220 | |
| 221 // Return "true" if the part of the heap that allocates Java | |
| 222 // objects has reached the maximal committed limit that it can | |
| 223 // reach, without a garbage collection. | |
| 224 virtual bool is_maximal_no_gc() const = 0; | |
| 225 | |
| 226 virtual size_t permanent_capacity() const = 0; | |
| 227 virtual size_t permanent_used() const = 0; | |
| 228 | |
| 229 // Support for java.lang.Runtime.maxMemory(): return the maximum amount of | |
| 230 // memory that the vm could make available for storing 'normal' java objects. | |
| 231 // This is based on the reserved address space, but should not include space | |
| 232 // that the vm uses internally for bookkeeping or temporary storage (e.g., | |
| 233 // perm gen space or, in the case of the young gen, one of the survivor | |
| 234 // spaces). | |
| 235 virtual size_t max_capacity() const = 0; | |
| 236 | |
| 237 // Returns "TRUE" if "p" points into the reserved area of the heap. | |
| 238 bool is_in_reserved(const void* p) const { | |
| 239 return _reserved.contains(p); | |
| 240 } | |
| 241 | |
| 242 bool is_in_reserved_or_null(const void* p) const { | |
| 243 return p == NULL || is_in_reserved(p); | |
| 244 } | |
| 245 | |
| 4708 | 246 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
| 247 // Since this method can be expensive in general, we restrict its | |
| 0 | 248 // use to assertion checking only. |
| 249 virtual bool is_in(const void* p) const = 0; | |
| 250 | |
| 251 bool is_in_or_null(const void* p) const { | |
| 252 return p == NULL || is_in(p); | |
| 253 } | |
| 254 | |
| 255 // Let's define some terms: a "closed" subset of a heap is one that | |
| 256 // | |
| 257 // 1) contains all currently-allocated objects, and | |
| 258 // | |
| 259 // 2) is closed under reference: no object in the closed subset | |
| 260 // references one outside the closed subset. | |
| 261 // | |
| 262 // Membership in a heap's closed subset is useful for assertions. | |
| 263 // Clearly, the entire heap is a closed subset, so the default | |
| 264 // implementation is to use "is_in_reserved". But this may not be too | |
| 265 // liberal to perform useful checking. Also, the "is_in" predicate | |
| 266 // defines a closed subset, but may be too expensive, since "is_in" | |
| 267 // verifies that its argument points to an object head. The | |
| 268 // "closed_subset" method allows a heap to define an intermediate | |
| 269 // predicate, allowing more precise checking than "is_in_reserved" at | |
| 270 // lower cost than "is_in." | |
| 271 | |
| 272 // One important case is a heap composed of disjoint contiguous spaces, | |
| 273 // such as the Garbage-First collector. Such heaps have a convenient | |
| 274 // closed subset consisting of the allocated portions of those | |
| 275 // contiguous spaces. | |
| 276 | |
| 277 // Return "TRUE" iff the given pointer points into the heap's defined | |
| 278 // closed subset (which defaults to the entire heap). | |
| 279 virtual bool is_in_closed_subset(const void* p) const { | |
| 280 return is_in_reserved(p); | |
| 281 } | |
| 282 | |
| 283 bool is_in_closed_subset_or_null(const void* p) const { | |
| 284 return p == NULL || is_in_closed_subset(p); | |
| 285 } | |
| 286 | |
| 941 | 287 // XXX is_permanent() and is_in_permanent() should be better named |
| 288 // to distinguish one from the other. | |
| 289 | |
| 0 | 290 // Returns "TRUE" if "p" is allocated as "permanent" data. |
| 291 // If the heap does not use "permanent" data, returns the same | |
| 292 // value is_in_reserved() would return. | |
| 293 // NOTE: this actually returns true if "p" is in reserved space | |
| 294 // for the space not that it is actually allocated (i.e. in committed | |
| 295 // space). If you need the more conservative answer use is_permanent(). | |
| 296 virtual bool is_in_permanent(const void *p) const = 0; | |
| 297 | |
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298 |
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299 #ifdef ASSERT |
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300 // Returns true if "p" is in the part of the |
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301 // heap being collected. |
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302 virtual bool is_in_partial_collection(const void *p) = 0; |
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303 #endif |
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304 |
| 941 | 305 bool is_in_permanent_or_null(const void *p) const { |
| 306 return p == NULL || is_in_permanent(p); | |
| 307 } | |
| 308 | |
| 0 | 309 // Returns "TRUE" if "p" is in the committed area of "permanent" data. |
| 310 // If the heap does not use "permanent" data, returns the same | |
| 311 // value is_in() would return. | |
| 312 virtual bool is_permanent(const void *p) const = 0; | |
| 313 | |
| 941 | 314 bool is_permanent_or_null(const void *p) const { |
| 315 return p == NULL || is_permanent(p); | |
| 0 | 316 } |
| 317 | |
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318 // An object is scavengable if its location may move during a scavenge. |
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319 // (A scavenge is a GC which is not a full GC.) |
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320 virtual bool is_scavengable(const void *p) = 0; |
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321 |
| 0 | 322 // Returns "TRUE" if "p" is a method oop in the |
| 323 // current heap, with high probability. This predicate | |
| 324 // is not stable, in general. | |
| 325 bool is_valid_method(oop p) const; | |
| 326 | |
| 327 void set_gc_cause(GCCause::Cause v) { | |
| 328 if (UsePerfData) { | |
| 329 _gc_lastcause = _gc_cause; | |
| 330 _perf_gc_lastcause->set_value(GCCause::to_string(_gc_lastcause)); | |
| 331 _perf_gc_cause->set_value(GCCause::to_string(v)); | |
| 332 } | |
| 333 _gc_cause = v; | |
| 334 } | |
| 335 GCCause::Cause gc_cause() { return _gc_cause; } | |
| 336 | |
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337 // Number of threads currently working on GC tasks. |
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338 uint n_par_threads() { return _n_par_threads; } |
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339 |
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340 // May be overridden to set additional parallelism. |
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341 virtual void set_par_threads(uint t) { _n_par_threads = t; }; |
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342 |
| 0 | 343 // Preload classes into the shared portion of the heap, and then dump |
| 344 // that data to a file so that it can be loaded directly by another | |
| 345 // VM (then terminate). | |
| 346 virtual void preload_and_dump(TRAPS) { ShouldNotReachHere(); } | |
| 347 | |
| 4009 | 348 // Allocate and initialize instances of Class |
| 349 static oop Class_obj_allocate(KlassHandle klass, int size, KlassHandle real_klass, TRAPS); | |
| 350 | |
| 0 | 351 // General obj/array allocation facilities. |
| 352 inline static oop obj_allocate(KlassHandle klass, int size, TRAPS); | |
| 353 inline static oop array_allocate(KlassHandle klass, int size, int length, TRAPS); | |
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354 inline static oop array_allocate_nozero(KlassHandle klass, int size, int length, TRAPS); |
| 0 | 355 |
| 356 // Special obj/array allocation facilities. | |
| 357 // Some heaps may want to manage "permanent" data uniquely. These default | |
| 358 // to the general routines if the heap does not support such handling. | |
| 359 inline static oop permanent_obj_allocate(KlassHandle klass, int size, TRAPS); | |
| 360 // permanent_obj_allocate_no_klass_install() does not do the installation of | |
| 361 // the klass pointer in the newly created object (as permanent_obj_allocate() | |
| 362 // above does). This allows for a delay in the installation of the klass | |
| 363 // pointer that is needed during the create of klassKlass's. The | |
| 364 // method post_allocation_install_obj_klass() is used to install the | |
| 365 // klass pointer. | |
| 366 inline static oop permanent_obj_allocate_no_klass_install(KlassHandle klass, | |
| 367 int size, | |
| 368 TRAPS); | |
| 369 inline static void post_allocation_install_obj_klass(KlassHandle klass, | |
| 370 oop obj, | |
| 371 int size); | |
| 372 inline static oop permanent_array_allocate(KlassHandle klass, int size, int length, TRAPS); | |
| 373 | |
| 374 // Raw memory allocation facilities | |
| 375 // The obj and array allocate methods are covers for these methods. | |
| 376 // The permanent allocation method should default to mem_allocate if | |
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377 // permanent memory isn't supported. mem_allocate() should never be |
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378 // called to allocate TLABs, only individual objects. |
| 0 | 379 virtual HeapWord* mem_allocate(size_t size, |
| 380 bool* gc_overhead_limit_was_exceeded) = 0; | |
| 381 virtual HeapWord* permanent_mem_allocate(size_t size) = 0; | |
| 382 | |
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383 // Utilities for turning raw memory into filler objects. |
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384 // |
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385 // min_fill_size() is the smallest region that can be filled. |
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386 // fill_with_objects() can fill arbitrary-sized regions of the heap using |
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387 // multiple objects. fill_with_object() is for regions known to be smaller |
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388 // than the largest array of integers; it uses a single object to fill the |
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389 // region and has slightly less overhead. |
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390 static size_t min_fill_size() { |
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391 return size_t(align_object_size(oopDesc::header_size())); |
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392 } |
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393 |
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394 static void fill_with_objects(HeapWord* start, size_t words, bool zap = true); |
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395 |
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396 static void fill_with_object(HeapWord* start, size_t words, bool zap = true); |
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397 static void fill_with_object(MemRegion region, bool zap = true) { |
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398 fill_with_object(region.start(), region.word_size(), zap); |
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399 } |
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400 static void fill_with_object(HeapWord* start, HeapWord* end, bool zap = true) { |
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401 fill_with_object(start, pointer_delta(end, start), zap); |
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402 } |
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403 |
| 0 | 404 // Some heaps may offer a contiguous region for shared non-blocking |
| 405 // allocation, via inlined code (by exporting the address of the top and | |
| 406 // end fields defining the extent of the contiguous allocation region.) | |
| 407 | |
| 408 // This function returns "true" iff the heap supports this kind of | |
| 409 // allocation. (Default is "no".) | |
| 410 virtual bool supports_inline_contig_alloc() const { | |
| 411 return false; | |
| 412 } | |
| 413 // These functions return the addresses of the fields that define the | |
| 414 // boundaries of the contiguous allocation area. (These fields should be | |
| 415 // physically near to one another.) | |
| 416 virtual HeapWord** top_addr() const { | |
| 417 guarantee(false, "inline contiguous allocation not supported"); | |
| 418 return NULL; | |
| 419 } | |
| 420 virtual HeapWord** end_addr() const { | |
| 421 guarantee(false, "inline contiguous allocation not supported"); | |
| 422 return NULL; | |
| 423 } | |
| 424 | |
| 425 // Some heaps may be in an unparseable state at certain times between | |
| 426 // collections. This may be necessary for efficient implementation of | |
| 427 // certain allocation-related activities. Calling this function before | |
| 428 // attempting to parse a heap ensures that the heap is in a parsable | |
| 429 // state (provided other concurrent activity does not introduce | |
| 430 // unparsability). It is normally expected, therefore, that this | |
| 431 // method is invoked with the world stopped. | |
| 432 // NOTE: if you override this method, make sure you call | |
| 433 // super::ensure_parsability so that the non-generational | |
| 434 // part of the work gets done. See implementation of | |
| 435 // CollectedHeap::ensure_parsability and, for instance, | |
| 436 // that of GenCollectedHeap::ensure_parsability(). | |
| 437 // The argument "retire_tlabs" controls whether existing TLABs | |
| 438 // are merely filled or also retired, thus preventing further | |
| 439 // allocation from them and necessitating allocation of new TLABs. | |
| 440 virtual void ensure_parsability(bool retire_tlabs); | |
| 441 | |
| 442 // Return an estimate of the maximum allocation that could be performed | |
| 443 // without triggering any collection or expansion activity. In a | |
| 444 // generational collector, for example, this is probably the largest | |
| 445 // allocation that could be supported (without expansion) in the youngest | |
| 446 // generation. It is "unsafe" because no locks are taken; the result | |
| 447 // should be treated as an approximation, not a guarantee, for use in | |
| 448 // heuristic resizing decisions. | |
| 449 virtual size_t unsafe_max_alloc() = 0; | |
| 450 | |
| 451 // Section on thread-local allocation buffers (TLABs) | |
| 452 // If the heap supports thread-local allocation buffers, it should override | |
| 453 // the following methods: | |
| 454 // Returns "true" iff the heap supports thread-local allocation buffers. | |
| 455 // The default is "no". | |
| 456 virtual bool supports_tlab_allocation() const { | |
| 457 return false; | |
| 458 } | |
| 459 // The amount of space available for thread-local allocation buffers. | |
| 460 virtual size_t tlab_capacity(Thread *thr) const { | |
| 461 guarantee(false, "thread-local allocation buffers not supported"); | |
| 462 return 0; | |
| 463 } | |
| 464 // An estimate of the maximum allocation that could be performed | |
| 465 // for thread-local allocation buffers without triggering any | |
| 466 // collection or expansion activity. | |
| 467 virtual size_t unsafe_max_tlab_alloc(Thread *thr) const { | |
| 468 guarantee(false, "thread-local allocation buffers not supported"); | |
| 469 return 0; | |
| 470 } | |
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471 |
| 0 | 472 // Can a compiler initialize a new object without store barriers? |
| 473 // This permission only extends from the creation of a new object | |
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474 // via a TLAB up to the first subsequent safepoint. If such permission |
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475 // is granted for this heap type, the compiler promises to call |
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476 // defer_store_barrier() below on any slow path allocation of |
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477 // a new object for which such initializing store barriers will |
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478 // have been elided. |
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479 virtual bool can_elide_tlab_store_barriers() const = 0; |
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480 |
| 0 | 481 // If a compiler is eliding store barriers for TLAB-allocated objects, |
| 482 // there is probably a corresponding slow path which can produce | |
| 483 // an object allocated anywhere. The compiler's runtime support | |
| 484 // promises to call this function on such a slow-path-allocated | |
| 485 // object before performing initializations that have elided | |
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486 // store barriers. Returns new_obj, or maybe a safer copy thereof. |
| 1166 | 487 virtual oop new_store_pre_barrier(JavaThread* thread, oop new_obj); |
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488 |
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489 // Answers whether an initializing store to a new object currently |
| 1166 | 490 // allocated at the given address doesn't need a store |
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491 // barrier. Returns "true" if it doesn't need an initializing |
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492 // store barrier; answers "false" if it does. |
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493 virtual bool can_elide_initializing_store_barrier(oop new_obj) = 0; |
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494 |
| 1166 | 495 // If a compiler is eliding store barriers for TLAB-allocated objects, |
| 496 // we will be informed of a slow-path allocation by a call | |
| 497 // to new_store_pre_barrier() above. Such a call precedes the | |
| 498 // initialization of the object itself, and no post-store-barriers will | |
| 499 // be issued. Some heap types require that the barrier strictly follows | |
| 500 // the initializing stores. (This is currently implemented by deferring the | |
| 501 // barrier until the next slow-path allocation or gc-related safepoint.) | |
| 502 // This interface answers whether a particular heap type needs the card | |
| 503 // mark to be thus strictly sequenced after the stores. | |
| 504 virtual bool card_mark_must_follow_store() const = 0; | |
| 505 | |
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506 // If the CollectedHeap was asked to defer a store barrier above, |
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507 // this informs it to flush such a deferred store barrier to the |
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508 // remembered set. |
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509 virtual void flush_deferred_store_barrier(JavaThread* thread); |
| 0 | 510 |
| 511 // Can a compiler elide a store barrier when it writes | |
| 512 // a permanent oop into the heap? Applies when the compiler | |
| 513 // is storing x to the heap, where x->is_perm() is true. | |
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514 virtual bool can_elide_permanent_oop_store_barriers() const = 0; |
| 0 | 515 |
| 516 // Does this heap support heap inspection (+PrintClassHistogram?) | |
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517 virtual bool supports_heap_inspection() const = 0; |
| 0 | 518 |
| 519 // Perform a collection of the heap; intended for use in implementing | |
| 520 // "System.gc". This probably implies as full a collection as the | |
| 521 // "CollectedHeap" supports. | |
| 522 virtual void collect(GCCause::Cause cause) = 0; | |
| 523 | |
| 524 // This interface assumes that it's being called by the | |
| 525 // vm thread. It collects the heap assuming that the | |
| 526 // heap lock is already held and that we are executing in | |
| 527 // the context of the vm thread. | |
| 528 virtual void collect_as_vm_thread(GCCause::Cause cause) = 0; | |
| 529 | |
| 530 // Returns the barrier set for this heap | |
| 531 BarrierSet* barrier_set() { return _barrier_set; } | |
| 532 | |
| 533 // Returns "true" iff there is a stop-world GC in progress. (I assume | |
| 534 // that it should answer "false" for the concurrent part of a concurrent | |
| 535 // collector -- dld). | |
| 536 bool is_gc_active() const { return _is_gc_active; } | |
| 537 | |
| 538 // Total number of GC collections (started) | |
| 539 unsigned int total_collections() const { return _total_collections; } | |
| 540 unsigned int total_full_collections() const { return _total_full_collections;} | |
| 541 | |
| 542 // Increment total number of GC collections (started) | |
| 543 // Should be protected but used by PSMarkSweep - cleanup for 1.4.2 | |
| 544 void increment_total_collections(bool full = false) { | |
| 545 _total_collections++; | |
| 546 if (full) { | |
| 547 increment_total_full_collections(); | |
| 548 } | |
| 549 } | |
| 550 | |
| 551 void increment_total_full_collections() { _total_full_collections++; } | |
| 552 | |
| 553 // Return the AdaptiveSizePolicy for the heap. | |
| 554 virtual AdaptiveSizePolicy* size_policy() = 0; | |
| 555 | |
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556 // Return the CollectorPolicy for the heap |
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557 virtual CollectorPolicy* collector_policy() const = 0; |
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558 |
| 0 | 559 // Iterate over all the ref-containing fields of all objects, calling |
| 560 // "cl.do_oop" on each. This includes objects in permanent memory. | |
| 561 virtual void oop_iterate(OopClosure* cl) = 0; | |
| 562 | |
| 563 // Iterate over all objects, calling "cl.do_object" on each. | |
| 564 // This includes objects in permanent memory. | |
| 565 virtual void object_iterate(ObjectClosure* cl) = 0; | |
| 566 | |
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567 // Similar to object_iterate() except iterates only |
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568 // over live objects. |
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569 virtual void safe_object_iterate(ObjectClosure* cl) = 0; |
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570 |
| 0 | 571 // Behaves the same as oop_iterate, except only traverses |
| 572 // interior pointers contained in permanent memory. If there | |
| 573 // is no permanent memory, does nothing. | |
| 574 virtual void permanent_oop_iterate(OopClosure* cl) = 0; | |
| 575 | |
| 576 // Behaves the same as object_iterate, except only traverses | |
| 577 // object contained in permanent memory. If there is no | |
| 578 // permanent memory, does nothing. | |
| 579 virtual void permanent_object_iterate(ObjectClosure* cl) = 0; | |
| 580 | |
| 581 // NOTE! There is no requirement that a collector implement these | |
| 582 // functions. | |
| 583 // | |
| 584 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
| 585 // each address in the (reserved) heap is a member of exactly | |
| 586 // one block. The defining characteristic of a block is that it is | |
| 587 // possible to find its size, and thus to progress forward to the next | |
| 588 // block. (Blocks may be of different sizes.) Thus, blocks may | |
| 589 // represent Java objects, or they might be free blocks in a | |
| 590 // free-list-based heap (or subheap), as long as the two kinds are | |
| 591 // distinguishable and the size of each is determinable. | |
| 592 | |
| 593 // Returns the address of the start of the "block" that contains the | |
| 594 // address "addr". We say "blocks" instead of "object" since some heaps | |
| 595 // may not pack objects densely; a chunk may either be an object or a | |
| 596 // non-object. | |
| 597 virtual HeapWord* block_start(const void* addr) const = 0; | |
| 598 | |
| 599 // Requires "addr" to be the start of a chunk, and returns its size. | |
| 600 // "addr + size" is required to be the start of a new chunk, or the end | |
| 601 // of the active area of the heap. | |
| 602 virtual size_t block_size(const HeapWord* addr) const = 0; | |
| 603 | |
| 604 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
| 605 // the block is an object. | |
| 606 virtual bool block_is_obj(const HeapWord* addr) const = 0; | |
| 607 | |
| 608 // Returns the longest time (in ms) that has elapsed since the last | |
| 609 // time that any part of the heap was examined by a garbage collection. | |
| 610 virtual jlong millis_since_last_gc() = 0; | |
| 611 | |
| 612 // Perform any cleanup actions necessary before allowing a verification. | |
| 613 virtual void prepare_for_verify() = 0; | |
| 614 | |
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615 // Generate any dumps preceding or following a full gc |
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616 void pre_full_gc_dump(); |
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617 void post_full_gc_dump(); |
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618 |
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619 // Print heap information on the given outputStream. |
| 0 | 620 virtual void print_on(outputStream* st) const = 0; |
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621 // The default behavior is to call print_on() on tty. |
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622 virtual void print() const { |
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623 print_on(tty); |
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624 } |
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625 // Print more detailed heap information on the given |
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626 // outputStream. The default behaviour is to call print_on(). It is |
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627 // up to each subclass to override it and add any additional output |
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628 // it needs. |
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629 virtual void print_extended_on(outputStream* st) const { |
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630 print_on(st); |
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631 } |
| 0 | 632 |
| 633 // Print all GC threads (other than the VM thread) | |
| 634 // used by this heap. | |
| 635 virtual void print_gc_threads_on(outputStream* st) const = 0; | |
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636 // The default behavior is to call print_gc_threads_on() on tty. |
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637 void print_gc_threads() { |
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638 print_gc_threads_on(tty); |
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639 } |
| 0 | 640 // Iterator for all GC threads (other than VM thread) |
| 641 virtual void gc_threads_do(ThreadClosure* tc) const = 0; | |
| 642 | |
| 643 // Print any relevant tracing info that flags imply. | |
| 644 // Default implementation does nothing. | |
| 645 virtual void print_tracing_info() const = 0; | |
| 646 | |
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647 // If PrintHeapAtGC is set call the appropriate routi |
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648 void print_heap_before_gc() { |
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649 if (PrintHeapAtGC) { |
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650 Universe::print_heap_before_gc(); |
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651 } |
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652 if (_gc_heap_log != NULL) { |
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653 _gc_heap_log->log_heap_before(); |
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654 } |
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655 } |
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656 void print_heap_after_gc() { |
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657 if (PrintHeapAtGC) { |
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658 Universe::print_heap_after_gc(); |
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659 } |
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660 if (_gc_heap_log != NULL) { |
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661 _gc_heap_log->log_heap_after(); |
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662 } |
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663 } |
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664 |
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665 // Allocate GCHeapLog during VM startup |
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666 static void initialize_heap_log(); |
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667 |
| 0 | 668 // Heap verification |
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669 virtual void verify(bool allow_dirty, bool silent, VerifyOption option) = 0; |
| 0 | 670 |
| 671 // Non product verification and debugging. | |
| 672 #ifndef PRODUCT | |
| 673 // Support for PromotionFailureALot. Return true if it's time to cause a | |
| 674 // promotion failure. The no-argument version uses | |
| 675 // this->_promotion_failure_alot_count as the counter. | |
| 676 inline bool promotion_should_fail(volatile size_t* count); | |
| 677 inline bool promotion_should_fail(); | |
| 678 | |
| 679 // Reset the PromotionFailureALot counters. Should be called at the end of a | |
| 680 // GC in which promotion failure ocurred. | |
| 681 inline void reset_promotion_should_fail(volatile size_t* count); | |
| 682 inline void reset_promotion_should_fail(); | |
| 683 #endif // #ifndef PRODUCT | |
| 684 | |
| 685 #ifdef ASSERT | |
| 686 static int fired_fake_oom() { | |
| 687 return (CIFireOOMAt > 1 && _fire_out_of_memory_count >= CIFireOOMAt); | |
| 688 } | |
| 689 #endif | |
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690 |
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691 public: |
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692 // This is a convenience method that is used in cases where |
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693 // the actual number of GC worker threads is not pertinent but |
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694 // only whether there more than 0. Use of this method helps |
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695 // reduce the occurrence of ParallelGCThreads to uses where the |
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696 // actual number may be germane. |
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697 static bool use_parallel_gc_threads() { return ParallelGCThreads > 0; } |
| 4708 | 698 |
| 699 /////////////// Unit tests /////////////// | |
| 700 | |
| 701 NOT_PRODUCT(static void test_is_in();) | |
| 0 | 702 }; |
| 703 | |
| 704 // Class to set and reset the GC cause for a CollectedHeap. | |
| 705 | |
| 706 class GCCauseSetter : StackObj { | |
| 707 CollectedHeap* _heap; | |
| 708 GCCause::Cause _previous_cause; | |
| 709 public: | |
| 710 GCCauseSetter(CollectedHeap* heap, GCCause::Cause cause) { | |
| 711 assert(SafepointSynchronize::is_at_safepoint(), | |
| 712 "This method manipulates heap state without locking"); | |
| 713 _heap = heap; | |
| 714 _previous_cause = _heap->gc_cause(); | |
| 715 _heap->set_gc_cause(cause); | |
| 716 } | |
| 717 | |
| 718 ~GCCauseSetter() { | |
| 719 assert(SafepointSynchronize::is_at_safepoint(), | |
| 720 "This method manipulates heap state without locking"); | |
| 721 _heap->set_gc_cause(_previous_cause); | |
| 722 } | |
| 723 }; | |
| 1972 | 724 |
| 725 #endif // SHARE_VM_GC_INTERFACE_COLLECTEDHEAP_HPP |