18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_GC_SHARED_GENCOLLECTEDHEAP_HPP
26 #define SHARE_GC_SHARED_GENCOLLECTEDHEAP_HPP
27
28 #include "gc/shared/collectedHeap.hpp"
29 #include "gc/shared/generation.hpp"
30 #include "gc/shared/oopStorageParState.hpp"
31 #include "gc/shared/preGCValues.hpp"
32 #include "gc/shared/softRefGenPolicy.hpp"
33
34 class AdaptiveSizePolicy;
35 class CardTableRS;
36 class GCPolicyCounters;
37 class GenerationSpec;
38 class StrongRootsScope;
39 class SubTasksDone;
40 class WorkerThreads;
41
42 // A "GenCollectedHeap" is a CollectedHeap that uses generational
43 // collection. It has two generations, young and old.
44 class GenCollectedHeap : public CollectedHeap {
45 friend class Generation;
46 friend class DefNewGeneration;
47 friend class TenuredGeneration;
48 friend class GenMarkSweep;
49 friend class VM_GenCollectForAllocation;
50 friend class VM_GenCollectFull;
51 friend class VM_GenCollectFullConcurrent;
52 friend class VM_GC_HeapInspection;
53 friend class VM_HeapDumper;
54 friend class HeapInspection;
55 friend class GCCauseSetter;
56 friend class VMStructs;
57 public:
71 GenerationSpec* _old_gen_spec;
72
73 // The singleton CardTable Remembered Set.
74 CardTableRS* _rem_set;
75
76 SoftRefGenPolicy _soft_ref_gen_policy;
77
78 // The sizing of the heap is controlled by a sizing policy.
79 AdaptiveSizePolicy* _size_policy;
80
81 GCPolicyCounters* _gc_policy_counters;
82
83 // Indicates that the most recent previous incremental collection failed.
84 // The flag is cleared when an action is taken that might clear the
85 // condition that caused that incremental collection to fail.
86 bool _incremental_collection_failed;
87
88 // In support of ExplicitGCInvokesConcurrent functionality
89 unsigned int _full_collections_completed;
90
91 // Collects the given generation.
92 void collect_generation(Generation* gen, bool full, size_t size, bool is_tlab,
93 bool run_verification, bool clear_soft_refs);
94
95 // Reserve aligned space for the heap as needed by the contained generations.
96 ReservedHeapSpace allocate(size_t alignment);
97
98 // Initialize ("weak") refs processing support
99 void ref_processing_init();
100
101 PreGenGCValues get_pre_gc_values() const;
102
103 protected:
104
105 GCMemoryManager* _young_manager;
106 GCMemoryManager* _old_manager;
107
108 // Helper functions for allocation
109 HeapWord* attempt_allocation(size_t size,
110 bool is_tlab,
313 virtual void do_generation(Generation* gen) = 0;
314 };
315
316 // Apply "cl.do_generation" to all generations in the heap
317 // If "old_to_young" determines the order.
318 void generation_iterate(GenClosure* cl, bool old_to_young);
319
320 // Return "true" if all generations have reached the
321 // maximal committed limit that they can reach, without a garbage
322 // collection.
323 virtual bool is_maximal_no_gc() const;
324
325 // This function returns the CardTableRS object that allows us to scan
326 // generations in a fully generational heap.
327 CardTableRS* rem_set() { return _rem_set; }
328
329 // Convenience function to be used in situations where the heap type can be
330 // asserted to be this type.
331 static GenCollectedHeap* heap();
332
333 // The ScanningOption determines which of the roots
334 // the closure is applied to:
335 // "SO_None" does none;
336 enum ScanningOption {
337 SO_None = 0x0,
338 SO_AllCodeCache = 0x8,
339 SO_ScavengeCodeCache = 0x10
340 };
341
342 protected:
343 void process_roots(ScanningOption so,
344 OopClosure* strong_roots,
345 CLDClosure* strong_cld_closure,
346 CLDClosure* weak_cld_closure,
347 CodeBlobToOopClosure* code_roots);
348
349 virtual void gc_prologue(bool full);
350 virtual void gc_epilogue(bool full);
351
352 public:
|
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_GC_SHARED_GENCOLLECTEDHEAP_HPP
26 #define SHARE_GC_SHARED_GENCOLLECTEDHEAP_HPP
27
28 #include "gc/shared/collectedHeap.hpp"
29 #include "gc/shared/generation.hpp"
30 #include "gc/shared/oopStorageParState.hpp"
31 #include "gc/shared/preGCValues.hpp"
32 #include "gc/shared/softRefGenPolicy.hpp"
33
34 class AdaptiveSizePolicy;
35 class CardTableRS;
36 class GCPolicyCounters;
37 class GenerationSpec;
38 class SlidingForwarding;
39 class StrongRootsScope;
40 class SubTasksDone;
41 class WorkerThreads;
42
43 // A "GenCollectedHeap" is a CollectedHeap that uses generational
44 // collection. It has two generations, young and old.
45 class GenCollectedHeap : public CollectedHeap {
46 friend class Generation;
47 friend class DefNewGeneration;
48 friend class TenuredGeneration;
49 friend class GenMarkSweep;
50 friend class VM_GenCollectForAllocation;
51 friend class VM_GenCollectFull;
52 friend class VM_GenCollectFullConcurrent;
53 friend class VM_GC_HeapInspection;
54 friend class VM_HeapDumper;
55 friend class HeapInspection;
56 friend class GCCauseSetter;
57 friend class VMStructs;
58 public:
72 GenerationSpec* _old_gen_spec;
73
74 // The singleton CardTable Remembered Set.
75 CardTableRS* _rem_set;
76
77 SoftRefGenPolicy _soft_ref_gen_policy;
78
79 // The sizing of the heap is controlled by a sizing policy.
80 AdaptiveSizePolicy* _size_policy;
81
82 GCPolicyCounters* _gc_policy_counters;
83
84 // Indicates that the most recent previous incremental collection failed.
85 // The flag is cleared when an action is taken that might clear the
86 // condition that caused that incremental collection to fail.
87 bool _incremental_collection_failed;
88
89 // In support of ExplicitGCInvokesConcurrent functionality
90 unsigned int _full_collections_completed;
91
92 SlidingForwarding* _forwarding;
93
94 // Collects the given generation.
95 void collect_generation(Generation* gen, bool full, size_t size, bool is_tlab,
96 bool run_verification, bool clear_soft_refs);
97
98 // Reserve aligned space for the heap as needed by the contained generations.
99 ReservedHeapSpace allocate(size_t alignment);
100
101 // Initialize ("weak") refs processing support
102 void ref_processing_init();
103
104 PreGenGCValues get_pre_gc_values() const;
105
106 protected:
107
108 GCMemoryManager* _young_manager;
109 GCMemoryManager* _old_manager;
110
111 // Helper functions for allocation
112 HeapWord* attempt_allocation(size_t size,
113 bool is_tlab,
316 virtual void do_generation(Generation* gen) = 0;
317 };
318
319 // Apply "cl.do_generation" to all generations in the heap
320 // If "old_to_young" determines the order.
321 void generation_iterate(GenClosure* cl, bool old_to_young);
322
323 // Return "true" if all generations have reached the
324 // maximal committed limit that they can reach, without a garbage
325 // collection.
326 virtual bool is_maximal_no_gc() const;
327
328 // This function returns the CardTableRS object that allows us to scan
329 // generations in a fully generational heap.
330 CardTableRS* rem_set() { return _rem_set; }
331
332 // Convenience function to be used in situations where the heap type can be
333 // asserted to be this type.
334 static GenCollectedHeap* heap();
335
336 SlidingForwarding* forwarding() const {
337 return _forwarding;
338 }
339
340 // The ScanningOption determines which of the roots
341 // the closure is applied to:
342 // "SO_None" does none;
343 enum ScanningOption {
344 SO_None = 0x0,
345 SO_AllCodeCache = 0x8,
346 SO_ScavengeCodeCache = 0x10
347 };
348
349 protected:
350 void process_roots(ScanningOption so,
351 OopClosure* strong_roots,
352 CLDClosure* strong_cld_closure,
353 CLDClosure* weak_cld_closure,
354 CodeBlobToOopClosure* code_roots);
355
356 virtual void gc_prologue(bool full);
357 virtual void gc_epilogue(bool full);
358
359 public:
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