author | johnc |
Thu, 15 Aug 2013 10:52:18 +0200 | |
changeset 19339 | d247781beec7 |
parent 18025 | b7bcf7497f93 |
child 20406 | 934f0b12daa9 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#ifndef SHARE_VM_GC_INTERFACE_COLLECTEDHEAP_HPP |
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#define SHARE_VM_GC_INTERFACE_COLLECTEDHEAP_HPP |
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#include "gc_interface/gcCause.hpp" |
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#include "gc_implementation/shared/gcWhen.hpp" |
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#include "memory/allocation.hpp" |
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#include "memory/barrierSet.hpp" |
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#include "runtime/handles.hpp" |
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#include "runtime/perfData.hpp" |
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#include "runtime/safepoint.hpp" |
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#include "utilities/events.hpp" |
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// A "CollectedHeap" is an implementation of a java heap for HotSpot. This |
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// is an abstract class: there may be many different kinds of heaps. This |
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// class defines the functions that a heap must implement, and contains |
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// infrastructure common to all heaps. |
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class AdaptiveSizePolicy; |
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class BarrierSet; |
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class CollectorPolicy; |
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class GCHeapSummary; |
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class GCTimer; |
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class GCTracer; |
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class MetaspaceSummary; |
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class Thread; |
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class ThreadClosure; |
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class VirtualSpaceSummary; |
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class nmethod; |
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class GCMessage : public FormatBuffer<1024> { |
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public: |
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bool is_before; |
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public: |
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GCMessage() {} |
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}; |
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class GCHeapLog : public EventLogBase<GCMessage> { |
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private: |
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void log_heap(bool before); |
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public: |
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GCHeapLog() : EventLogBase<GCMessage>("GC Heap History") {} |
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void log_heap_before() { |
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log_heap(true); |
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} |
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void log_heap_after() { |
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log_heap(false); |
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} |
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}; |
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// |
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// CollectedHeap |
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// SharedHeap |
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// GenCollectedHeap |
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// G1CollectedHeap |
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// ParallelScavengeHeap |
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// |
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class CollectedHeap : public CHeapObj<mtInternal> { |
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friend class VMStructs; |
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friend class IsGCActiveMark; // Block structured external access to _is_gc_active |
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#ifdef ASSERT |
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static int _fire_out_of_memory_count; |
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#endif |
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// Used for filler objects (static, but initialized in ctor). |
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static size_t _filler_array_max_size; |
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GCHeapLog* _gc_heap_log; |
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// Used in support of ReduceInitialCardMarks; only consulted if COMPILER2 is being used |
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bool _defer_initial_card_mark; |
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protected: |
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MemRegion _reserved; |
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BarrierSet* _barrier_set; |
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bool _is_gc_active; |
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uint _n_par_threads; |
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unsigned int _total_collections; // ... started |
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unsigned int _total_full_collections; // ... started |
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NOT_PRODUCT(volatile size_t _promotion_failure_alot_count;) |
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NOT_PRODUCT(volatile size_t _promotion_failure_alot_gc_number;) |
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// Reason for current garbage collection. Should be set to |
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// a value reflecting no collection between collections. |
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GCCause::Cause _gc_cause; |
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GCCause::Cause _gc_lastcause; |
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PerfStringVariable* _perf_gc_cause; |
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PerfStringVariable* _perf_gc_lastcause; |
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// Constructor |
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CollectedHeap(); |
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// Do common initializations that must follow instance construction, |
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// for example, those needing virtual calls. |
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// This code could perhaps be moved into initialize() but would |
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// be slightly more awkward because we want the latter to be a |
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// pure virtual. |
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void pre_initialize(); |
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// Create a new tlab. All TLAB allocations must go through this. |
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virtual HeapWord* allocate_new_tlab(size_t size); |
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// Accumulate statistics on all tlabs. |
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virtual void accumulate_statistics_all_tlabs(); |
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// Reinitialize tlabs before resuming mutators. |
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virtual void resize_all_tlabs(); |
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// Allocate from the current thread's TLAB, with broken-out slow path. |
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inline static HeapWord* allocate_from_tlab(KlassHandle klass, Thread* thread, size_t size); |
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static HeapWord* allocate_from_tlab_slow(KlassHandle klass, Thread* thread, size_t size); |
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// Allocate an uninitialized block of the given size, or returns NULL if |
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// this is impossible. |
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inline static HeapWord* common_mem_allocate_noinit(KlassHandle klass, size_t size, TRAPS); |
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// Like allocate_init, but the block returned by a successful allocation |
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// is guaranteed initialized to zeros. |
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inline static HeapWord* common_mem_allocate_init(KlassHandle klass, size_t size, TRAPS); |
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// Helper functions for (VM) allocation. |
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inline static void post_allocation_setup_common(KlassHandle klass, HeapWord* obj); |
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inline static void post_allocation_setup_no_klass_install(KlassHandle klass, |
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HeapWord* objPtr); |
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inline static void post_allocation_setup_obj(KlassHandle klass, HeapWord* obj); |
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inline static void post_allocation_setup_array(KlassHandle klass, |
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HeapWord* obj, int length); |
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// Clears an allocated object. |
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inline static void init_obj(HeapWord* obj, size_t size); |
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// Filler object utilities. |
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static inline size_t filler_array_hdr_size(); |
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static inline size_t filler_array_min_size(); |
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DEBUG_ONLY(static void fill_args_check(HeapWord* start, size_t words);) |
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DEBUG_ONLY(static void zap_filler_array(HeapWord* start, size_t words, bool zap = true);) |
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// Fill with a single array; caller must ensure filler_array_min_size() <= |
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// words <= filler_array_max_size(). |
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static inline void fill_with_array(HeapWord* start, size_t words, bool zap = true); |
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// Fill with a single object (either an int array or a java.lang.Object). |
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static inline void fill_with_object_impl(HeapWord* start, size_t words, bool zap = true); |
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virtual void trace_heap(GCWhen::Type when, GCTracer* tracer); |
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// Verification functions |
179 |
virtual void check_for_bad_heap_word_value(HeapWord* addr, size_t size) |
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PRODUCT_RETURN; |
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virtual void check_for_non_bad_heap_word_value(HeapWord* addr, size_t size) |
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PRODUCT_RETURN; |
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debug_only(static void check_for_valid_allocation_state();) |
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public: |
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enum Name { |
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Abstract, |
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SharedHeap, |
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GenCollectedHeap, |
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ParallelScavengeHeap, |
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G1CollectedHeap |
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}; |
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static inline size_t filler_array_max_size() { |
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return _filler_array_max_size; |
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} |
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virtual CollectedHeap::Name kind() const { return CollectedHeap::Abstract; } |
199 |
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/** |
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* Returns JNI error code JNI_ENOMEM if memory could not be allocated, |
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* and JNI_OK on success. |
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*/ |
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virtual jint initialize() = 0; |
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// In many heaps, there will be a need to perform some initialization activities |
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// after the Universe is fully formed, but before general heap allocation is allowed. |
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// This is the correct place to place such initialization methods. |
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virtual void post_initialize() = 0; |
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MemRegion reserved_region() const { return _reserved; } |
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address base() const { return (address)reserved_region().start(); } |
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virtual size_t capacity() const = 0; |
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virtual size_t used() const = 0; |
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216 |
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// Return "true" if the part of the heap that allocates Java |
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// objects has reached the maximal committed limit that it can |
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// reach, without a garbage collection. |
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virtual bool is_maximal_no_gc() const = 0; |
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// Support for java.lang.Runtime.maxMemory(): return the maximum amount of |
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// memory that the vm could make available for storing 'normal' java objects. |
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// This is based on the reserved address space, but should not include space |
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// that the vm uses internally for bookkeeping or temporary storage |
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// (e.g., in the case of the young gen, one of the survivor |
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// spaces). |
228 |
virtual size_t max_capacity() const = 0; |
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229 |
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// Returns "TRUE" if "p" points into the reserved area of the heap. |
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231 |
bool is_in_reserved(const void* p) const { |
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232 |
return _reserved.contains(p); |
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233 |
} |
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bool is_in_reserved_or_null(const void* p) const { |
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return p == NULL || is_in_reserved(p); |
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} |
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// Returns "TRUE" iff "p" points into the committed areas of the heap. |
240 |
// Since this method can be expensive in general, we restrict its |
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// use to assertion checking only. |
242 |
virtual bool is_in(const void* p) const = 0; |
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243 |
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244 |
bool is_in_or_null(const void* p) const { |
|
245 |
return p == NULL || is_in(p); |
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} |
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bool is_in_place(Metadata** p) { |
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return !Universe::heap()->is_in(p); |
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} |
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bool is_in_place(oop* p) { return Universe::heap()->is_in(p); } |
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bool is_in_place(narrowOop* p) { |
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oop o = oopDesc::load_decode_heap_oop_not_null(p); |
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return Universe::heap()->is_in((const void*)o); |
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} |
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256 |
|
1 | 257 |
// Let's define some terms: a "closed" subset of a heap is one that |
258 |
// |
|
259 |
// 1) contains all currently-allocated objects, and |
|
260 |
// |
|
261 |
// 2) is closed under reference: no object in the closed subset |
|
262 |
// references one outside the closed subset. |
|
263 |
// |
|
264 |
// Membership in a heap's closed subset is useful for assertions. |
|
265 |
// Clearly, the entire heap is a closed subset, so the default |
|
266 |
// implementation is to use "is_in_reserved". But this may not be too |
|
267 |
// liberal to perform useful checking. Also, the "is_in" predicate |
|
268 |
// defines a closed subset, but may be too expensive, since "is_in" |
|
269 |
// verifies that its argument points to an object head. The |
|
270 |
// "closed_subset" method allows a heap to define an intermediate |
|
271 |
// predicate, allowing more precise checking than "is_in_reserved" at |
|
272 |
// lower cost than "is_in." |
|
273 |
||
274 |
// One important case is a heap composed of disjoint contiguous spaces, |
|
275 |
// such as the Garbage-First collector. Such heaps have a convenient |
|
276 |
// closed subset consisting of the allocated portions of those |
|
277 |
// contiguous spaces. |
|
278 |
||
279 |
// Return "TRUE" iff the given pointer points into the heap's defined |
|
280 |
// closed subset (which defaults to the entire heap). |
|
281 |
virtual bool is_in_closed_subset(const void* p) const { |
|
282 |
return is_in_reserved(p); |
|
283 |
} |
|
284 |
||
285 |
bool is_in_closed_subset_or_null(const void* p) const { |
|
286 |
return p == NULL || is_in_closed_subset(p); |
|
287 |
} |
|
288 |
||
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|
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#ifdef ASSERT |
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// Returns true if "p" is in the part of the |
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291 |
// heap being collected. |
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292 |
virtual bool is_in_partial_collection(const void *p) = 0; |
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|
293 |
#endif |
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|
294 |
|
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|
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// An object is scavengable if its location may move during a scavenge. |
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|
296 |
// (A scavenge is a GC which is not a full GC.) |
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virtual bool is_scavengable(const void *p) = 0; |
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|
298 |
|
1 | 299 |
void set_gc_cause(GCCause::Cause v) { |
300 |
if (UsePerfData) { |
|
301 |
_gc_lastcause = _gc_cause; |
|
302 |
_perf_gc_lastcause->set_value(GCCause::to_string(_gc_lastcause)); |
|
303 |
_perf_gc_cause->set_value(GCCause::to_string(v)); |
|
304 |
} |
|
305 |
_gc_cause = v; |
|
306 |
} |
|
307 |
GCCause::Cause gc_cause() { return _gc_cause; } |
|
308 |
||
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|
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// Number of threads currently working on GC tasks. |
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|
310 |
uint n_par_threads() { return _n_par_threads; } |
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|
311 |
|
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312 |
// May be overridden to set additional parallelism. |
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|
313 |
virtual void set_par_threads(uint t) { _n_par_threads = t; }; |
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|
314 |
|
10742 | 315 |
// Allocate and initialize instances of Class |
316 |
static oop Class_obj_allocate(KlassHandle klass, int size, KlassHandle real_klass, TRAPS); |
|
317 |
||
1 | 318 |
// General obj/array allocation facilities. |
319 |
inline static oop obj_allocate(KlassHandle klass, int size, TRAPS); |
|
320 |
inline static oop array_allocate(KlassHandle klass, int size, int length, TRAPS); |
|
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321 |
inline static oop array_allocate_nozero(KlassHandle klass, int size, int length, TRAPS); |
1 | 322 |
|
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323 |
inline static void post_allocation_install_obj_klass(KlassHandle klass, |
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|
324 |
oop obj); |
1 | 325 |
|
326 |
// Raw memory allocation facilities |
|
327 |
// The obj and array allocate methods are covers for these methods. |
|
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|
328 |
// mem_allocate() should never be |
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|
329 |
// called to allocate TLABs, only individual objects. |
1 | 330 |
virtual HeapWord* mem_allocate(size_t size, |
331 |
bool* gc_overhead_limit_was_exceeded) = 0; |
|
332 |
||
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|
333 |
// Utilities for turning raw memory into filler objects. |
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|
334 |
// |
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|
335 |
// min_fill_size() is the smallest region that can be filled. |
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|
336 |
// fill_with_objects() can fill arbitrary-sized regions of the heap using |
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|
337 |
// multiple objects. fill_with_object() is for regions known to be smaller |
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|
338 |
// than the largest array of integers; it uses a single object to fill the |
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|
339 |
// region and has slightly less overhead. |
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|
340 |
static size_t min_fill_size() { |
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|
341 |
return size_t(align_object_size(oopDesc::header_size())); |
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|
342 |
} |
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|
343 |
|
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|
344 |
static void fill_with_objects(HeapWord* start, size_t words, bool zap = true); |
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|
345 |
|
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|
346 |
static void fill_with_object(HeapWord* start, size_t words, bool zap = true); |
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|
347 |
static void fill_with_object(MemRegion region, bool zap = true) { |
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|
348 |
fill_with_object(region.start(), region.word_size(), zap); |
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|
349 |
} |
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|
350 |
static void fill_with_object(HeapWord* start, HeapWord* end, bool zap = true) { |
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|
351 |
fill_with_object(start, pointer_delta(end, start), zap); |
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|
352 |
} |
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|
353 |
|
1 | 354 |
// Some heaps may offer a contiguous region for shared non-blocking |
355 |
// allocation, via inlined code (by exporting the address of the top and |
|
356 |
// end fields defining the extent of the contiguous allocation region.) |
|
357 |
||
358 |
// This function returns "true" iff the heap supports this kind of |
|
359 |
// allocation. (Default is "no".) |
|
360 |
virtual bool supports_inline_contig_alloc() const { |
|
361 |
return false; |
|
362 |
} |
|
363 |
// These functions return the addresses of the fields that define the |
|
364 |
// boundaries of the contiguous allocation area. (These fields should be |
|
365 |
// physically near to one another.) |
|
366 |
virtual HeapWord** top_addr() const { |
|
367 |
guarantee(false, "inline contiguous allocation not supported"); |
|
368 |
return NULL; |
|
369 |
} |
|
370 |
virtual HeapWord** end_addr() const { |
|
371 |
guarantee(false, "inline contiguous allocation not supported"); |
|
372 |
return NULL; |
|
373 |
} |
|
374 |
||
375 |
// Some heaps may be in an unparseable state at certain times between |
|
376 |
// collections. This may be necessary for efficient implementation of |
|
377 |
// certain allocation-related activities. Calling this function before |
|
378 |
// attempting to parse a heap ensures that the heap is in a parsable |
|
379 |
// state (provided other concurrent activity does not introduce |
|
380 |
// unparsability). It is normally expected, therefore, that this |
|
381 |
// method is invoked with the world stopped. |
|
382 |
// NOTE: if you override this method, make sure you call |
|
383 |
// super::ensure_parsability so that the non-generational |
|
384 |
// part of the work gets done. See implementation of |
|
385 |
// CollectedHeap::ensure_parsability and, for instance, |
|
386 |
// that of GenCollectedHeap::ensure_parsability(). |
|
387 |
// The argument "retire_tlabs" controls whether existing TLABs |
|
388 |
// are merely filled or also retired, thus preventing further |
|
389 |
// allocation from them and necessitating allocation of new TLABs. |
|
390 |
virtual void ensure_parsability(bool retire_tlabs); |
|
391 |
||
392 |
// Return an estimate of the maximum allocation that could be performed |
|
393 |
// without triggering any collection or expansion activity. In a |
|
394 |
// generational collector, for example, this is probably the largest |
|
395 |
// allocation that could be supported (without expansion) in the youngest |
|
396 |
// generation. It is "unsafe" because no locks are taken; the result |
|
397 |
// should be treated as an approximation, not a guarantee, for use in |
|
398 |
// heuristic resizing decisions. |
|
399 |
virtual size_t unsafe_max_alloc() = 0; |
|
400 |
||
401 |
// Section on thread-local allocation buffers (TLABs) |
|
402 |
// If the heap supports thread-local allocation buffers, it should override |
|
403 |
// the following methods: |
|
404 |
// Returns "true" iff the heap supports thread-local allocation buffers. |
|
405 |
// The default is "no". |
|
406 |
virtual bool supports_tlab_allocation() const { |
|
407 |
return false; |
|
408 |
} |
|
409 |
// The amount of space available for thread-local allocation buffers. |
|
410 |
virtual size_t tlab_capacity(Thread *thr) const { |
|
411 |
guarantee(false, "thread-local allocation buffers not supported"); |
|
412 |
return 0; |
|
413 |
} |
|
414 |
// An estimate of the maximum allocation that could be performed |
|
415 |
// for thread-local allocation buffers without triggering any |
|
416 |
// collection or expansion activity. |
|
417 |
virtual size_t unsafe_max_tlab_alloc(Thread *thr) const { |
|
418 |
guarantee(false, "thread-local allocation buffers not supported"); |
|
419 |
return 0; |
|
420 |
} |
|
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|
421 |
|
1 | 422 |
// Can a compiler initialize a new object without store barriers? |
423 |
// This permission only extends from the creation of a new object |
|
4030
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|
424 |
// via a TLAB up to the first subsequent safepoint. If such permission |
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|
425 |
// is granted for this heap type, the compiler promises to call |
4c471254865e
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|
426 |
// defer_store_barrier() below on any slow path allocation of |
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|
427 |
// a new object for which such initializing store barriers will |
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|
428 |
// have been elided. |
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|
429 |
virtual bool can_elide_tlab_store_barriers() const = 0; |
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|
430 |
|
1 | 431 |
// If a compiler is eliding store barriers for TLAB-allocated objects, |
432 |
// there is probably a corresponding slow path which can produce |
|
433 |
// an object allocated anywhere. The compiler's runtime support |
|
434 |
// promises to call this function on such a slow-path-allocated |
|
435 |
// object before performing initializations that have elided |
|
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|
436 |
// store barriers. Returns new_obj, or maybe a safer copy thereof. |
4637 | 437 |
virtual oop new_store_pre_barrier(JavaThread* thread, oop new_obj); |
4030
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|
438 |
|
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|
439 |
// Answers whether an initializing store to a new object currently |
4637 | 440 |
// allocated at the given address doesn't need a store |
4030
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|
441 |
// barrier. Returns "true" if it doesn't need an initializing |
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|
442 |
// store barrier; answers "false" if it does. |
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|
443 |
virtual bool can_elide_initializing_store_barrier(oop new_obj) = 0; |
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|
444 |
|
4637 | 445 |
// If a compiler is eliding store barriers for TLAB-allocated objects, |
446 |
// we will be informed of a slow-path allocation by a call |
|
447 |
// to new_store_pre_barrier() above. Such a call precedes the |
|
448 |
// initialization of the object itself, and no post-store-barriers will |
|
449 |
// be issued. Some heap types require that the barrier strictly follows |
|
450 |
// the initializing stores. (This is currently implemented by deferring the |
|
451 |
// barrier until the next slow-path allocation or gc-related safepoint.) |
|
452 |
// This interface answers whether a particular heap type needs the card |
|
453 |
// mark to be thus strictly sequenced after the stores. |
|
454 |
virtual bool card_mark_must_follow_store() const = 0; |
|
455 |
||
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|
456 |
// If the CollectedHeap was asked to defer a store barrier above, |
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|
457 |
// this informs it to flush such a deferred store barrier to the |
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|
458 |
// remembered set. |
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|
459 |
virtual void flush_deferred_store_barrier(JavaThread* thread); |
1 | 460 |
|
461 |
// Does this heap support heap inspection (+PrintClassHistogram?) |
|
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|
462 |
virtual bool supports_heap_inspection() const = 0; |
1 | 463 |
|
464 |
// Perform a collection of the heap; intended for use in implementing |
|
465 |
// "System.gc". This probably implies as full a collection as the |
|
466 |
// "CollectedHeap" supports. |
|
467 |
virtual void collect(GCCause::Cause cause) = 0; |
|
468 |
||
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|
469 |
// Perform a full collection |
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|
470 |
virtual void do_full_collection(bool clear_all_soft_refs) = 0; |
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|
471 |
|
1 | 472 |
// This interface assumes that it's being called by the |
473 |
// vm thread. It collects the heap assuming that the |
|
474 |
// heap lock is already held and that we are executing in |
|
475 |
// the context of the vm thread. |
|
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|
476 |
virtual void collect_as_vm_thread(GCCause::Cause cause); |
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|
477 |
|
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|
478 |
// Callback from VM_CollectForMetadataAllocation operation. |
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|
479 |
MetaWord* satisfy_failed_metadata_allocation(ClassLoaderData* loader_data, |
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|
480 |
size_t size, |
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|
481 |
Metaspace::MetadataType mdtype); |
1 | 482 |
|
483 |
// Returns the barrier set for this heap |
|
484 |
BarrierSet* barrier_set() { return _barrier_set; } |
|
485 |
||
486 |
// Returns "true" iff there is a stop-world GC in progress. (I assume |
|
487 |
// that it should answer "false" for the concurrent part of a concurrent |
|
488 |
// collector -- dld). |
|
489 |
bool is_gc_active() const { return _is_gc_active; } |
|
490 |
||
491 |
// Total number of GC collections (started) |
|
492 |
unsigned int total_collections() const { return _total_collections; } |
|
493 |
unsigned int total_full_collections() const { return _total_full_collections;} |
|
494 |
||
495 |
// Increment total number of GC collections (started) |
|
496 |
// Should be protected but used by PSMarkSweep - cleanup for 1.4.2 |
|
497 |
void increment_total_collections(bool full = false) { |
|
498 |
_total_collections++; |
|
499 |
if (full) { |
|
500 |
increment_total_full_collections(); |
|
501 |
} |
|
502 |
} |
|
503 |
||
504 |
void increment_total_full_collections() { _total_full_collections++; } |
|
505 |
||
506 |
// Return the AdaptiveSizePolicy for the heap. |
|
507 |
virtual AdaptiveSizePolicy* size_policy() = 0; |
|
508 |
||
5343
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|
509 |
// Return the CollectorPolicy for the heap |
95a5c4b89273
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|
510 |
virtual CollectorPolicy* collector_policy() const = 0; |
95a5c4b89273
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|
511 |
|
13728
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6964458: Reimplement class meta-data storage to use native memory
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|
512 |
void oop_iterate_no_header(OopClosure* cl); |
882756847a04
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|
513 |
|
1 | 514 |
// Iterate over all the ref-containing fields of all objects, calling |
13728
882756847a04
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|
515 |
// "cl.do_oop" on each. |
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|
516 |
virtual void oop_iterate(ExtendedOopClosure* cl) = 0; |
1 | 517 |
|
518 |
// Iterate over all objects, calling "cl.do_object" on each. |
|
519 |
virtual void object_iterate(ObjectClosure* cl) = 0; |
|
520 |
||
1893
c82e388e17c5
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|
521 |
// Similar to object_iterate() except iterates only |
c82e388e17c5
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|
522 |
// over live objects. |
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|
523 |
virtual void safe_object_iterate(ObjectClosure* cl) = 0; |
c82e388e17c5
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|
524 |
|
1 | 525 |
// NOTE! There is no requirement that a collector implement these |
526 |
// functions. |
|
527 |
// |
|
528 |
// A CollectedHeap is divided into a dense sequence of "blocks"; that is, |
|
529 |
// each address in the (reserved) heap is a member of exactly |
|
530 |
// one block. The defining characteristic of a block is that it is |
|
531 |
// possible to find its size, and thus to progress forward to the next |
|
532 |
// block. (Blocks may be of different sizes.) Thus, blocks may |
|
533 |
// represent Java objects, or they might be free blocks in a |
|
534 |
// free-list-based heap (or subheap), as long as the two kinds are |
|
535 |
// distinguishable and the size of each is determinable. |
|
536 |
||
537 |
// Returns the address of the start of the "block" that contains the |
|
538 |
// address "addr". We say "blocks" instead of "object" since some heaps |
|
539 |
// may not pack objects densely; a chunk may either be an object or a |
|
540 |
// non-object. |
|
541 |
virtual HeapWord* block_start(const void* addr) const = 0; |
|
542 |
||
543 |
// Requires "addr" to be the start of a chunk, and returns its size. |
|
544 |
// "addr + size" is required to be the start of a new chunk, or the end |
|
545 |
// of the active area of the heap. |
|
546 |
virtual size_t block_size(const HeapWord* addr) const = 0; |
|
547 |
||
548 |
// Requires "addr" to be the start of a block, and returns "TRUE" iff |
|
549 |
// the block is an object. |
|
550 |
virtual bool block_is_obj(const HeapWord* addr) const = 0; |
|
551 |
||
552 |
// Returns the longest time (in ms) that has elapsed since the last |
|
553 |
// time that any part of the heap was examined by a garbage collection. |
|
554 |
virtual jlong millis_since_last_gc() = 0; |
|
555 |
||
556 |
// Perform any cleanup actions necessary before allowing a verification. |
|
557 |
virtual void prepare_for_verify() = 0; |
|
558 |
||
2141
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
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diff
changeset
|
559 |
// Generate any dumps preceding or following a full gc |
18025 | 560 |
void pre_full_gc_dump(GCTimer* timer); |
561 |
void post_full_gc_dump(GCTimer* timer); |
|
562 |
||
563 |
VirtualSpaceSummary create_heap_space_summary(); |
|
564 |
GCHeapSummary create_heap_summary(); |
|
565 |
||
566 |
MetaspaceSummary create_metaspace_summary(); |
|
2141
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
2006
diff
changeset
|
567 |
|
10997
0be4b3be7197
7099849: G1: include heap region information in hs_err files
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parents:
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diff
changeset
|
568 |
// Print heap information on the given outputStream. |
1 | 569 |
virtual void print_on(outputStream* st) const = 0; |
10997
0be4b3be7197
7099849: G1: include heap region information in hs_err files
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diff
changeset
|
570 |
// The default behavior is to call print_on() on tty. |
0be4b3be7197
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diff
changeset
|
571 |
virtual void print() const { |
0be4b3be7197
7099849: G1: include heap region information in hs_err files
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parents:
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diff
changeset
|
572 |
print_on(tty); |
0be4b3be7197
7099849: G1: include heap region information in hs_err files
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parents:
10742
diff
changeset
|
573 |
} |
0be4b3be7197
7099849: G1: include heap region information in hs_err files
tonyp
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diff
changeset
|
574 |
// Print more detailed heap information on the given |
18025 | 575 |
// outputStream. The default behavior is to call print_on(). It is |
10997
0be4b3be7197
7099849: G1: include heap region information in hs_err files
tonyp
parents:
10742
diff
changeset
|
576 |
// up to each subclass to override it and add any additional output |
0be4b3be7197
7099849: G1: include heap region information in hs_err files
tonyp
parents:
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diff
changeset
|
577 |
// it needs. |
0be4b3be7197
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tonyp
parents:
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diff
changeset
|
578 |
virtual void print_extended_on(outputStream* st) const { |
0be4b3be7197
7099849: G1: include heap region information in hs_err files
tonyp
parents:
10742
diff
changeset
|
579 |
print_on(st); |
0be4b3be7197
7099849: G1: include heap region information in hs_err files
tonyp
parents:
10742
diff
changeset
|
580 |
} |
1 | 581 |
|
16685
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8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
14579
diff
changeset
|
582 |
virtual void print_on_error(outputStream* st) const { |
41c34debcde0
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
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diff
changeset
|
583 |
st->print_cr("Heap:"); |
41c34debcde0
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
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diff
changeset
|
584 |
print_extended_on(st); |
41c34debcde0
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
14579
diff
changeset
|
585 |
st->cr(); |
41c34debcde0
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
14579
diff
changeset
|
586 |
|
41c34debcde0
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
14579
diff
changeset
|
587 |
_barrier_set->print_on(st); |
41c34debcde0
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
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diff
changeset
|
588 |
} |
41c34debcde0
8011872: Include Bit Map addresses in the hs_err files
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parents:
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diff
changeset
|
589 |
|
1 | 590 |
// Print all GC threads (other than the VM thread) |
591 |
// used by this heap. |
|
592 |
virtual void print_gc_threads_on(outputStream* st) const = 0; |
|
10997
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parents:
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diff
changeset
|
593 |
// The default behavior is to call print_gc_threads_on() on tty. |
0be4b3be7197
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parents:
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diff
changeset
|
594 |
void print_gc_threads() { |
0be4b3be7197
7099849: G1: include heap region information in hs_err files
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parents:
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diff
changeset
|
595 |
print_gc_threads_on(tty); |
0be4b3be7197
7099849: G1: include heap region information in hs_err files
tonyp
parents:
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diff
changeset
|
596 |
} |
1 | 597 |
// Iterator for all GC threads (other than VM thread) |
598 |
virtual void gc_threads_do(ThreadClosure* tc) const = 0; |
|
599 |
||
600 |
// Print any relevant tracing info that flags imply. |
|
601 |
// Default implementation does nothing. |
|
602 |
virtual void print_tracing_info() const = 0; |
|
603 |
||
18025 | 604 |
void print_heap_before_gc(); |
605 |
void print_heap_after_gc(); |
|
606 |
||
19339 | 607 |
// Registering and unregistering an nmethod (compiled code) with the heap. |
608 |
// Override with specific mechanism for each specialized heap type. |
|
609 |
virtual void register_nmethod(nmethod* nm); |
|
610 |
virtual void unregister_nmethod(nmethod* nm); |
|
611 |
||
18025 | 612 |
void trace_heap_before_gc(GCTracer* gc_tracer); |
613 |
void trace_heap_after_gc(GCTracer* gc_tracer); |
|
11636
3c07b54482a5
7141200: log some interesting information in ring buffers for crashes
never
parents:
11396
diff
changeset
|
614 |
|
1 | 615 |
// Heap verification |
12379 | 616 |
virtual void verify(bool silent, VerifyOption option) = 0; |
1 | 617 |
|
618 |
// Non product verification and debugging. |
|
619 |
#ifndef PRODUCT |
|
620 |
// Support for PromotionFailureALot. Return true if it's time to cause a |
|
621 |
// promotion failure. The no-argument version uses |
|
622 |
// this->_promotion_failure_alot_count as the counter. |
|
623 |
inline bool promotion_should_fail(volatile size_t* count); |
|
624 |
inline bool promotion_should_fail(); |
|
625 |
||
626 |
// Reset the PromotionFailureALot counters. Should be called at the end of a |
|
18025 | 627 |
// GC in which promotion failure occurred. |
1 | 628 |
inline void reset_promotion_should_fail(volatile size_t* count); |
629 |
inline void reset_promotion_should_fail(); |
|
630 |
#endif // #ifndef PRODUCT |
|
631 |
||
632 |
#ifdef ASSERT |
|
633 |
static int fired_fake_oom() { |
|
634 |
return (CIFireOOMAt > 1 && _fire_out_of_memory_count >= CIFireOOMAt); |
|
635 |
} |
|
636 |
#endif |
|
6759
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
637 |
|
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
638 |
public: |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
639 |
// This is a convenience method that is used in cases where |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
640 |
// the actual number of GC worker threads is not pertinent but |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
641 |
// only whether there more than 0. Use of this method helps |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
642 |
// reduce the occurrence of ParallelGCThreads to uses where the |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
643 |
// actual number may be germane. |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
644 |
static bool use_parallel_gc_threads() { return ParallelGCThreads > 0; } |
11247 | 645 |
|
646 |
/////////////// Unit tests /////////////// |
|
647 |
||
648 |
NOT_PRODUCT(static void test_is_in();) |
|
1 | 649 |
}; |
650 |
||
651 |
// Class to set and reset the GC cause for a CollectedHeap. |
|
652 |
||
653 |
class GCCauseSetter : StackObj { |
|
654 |
CollectedHeap* _heap; |
|
655 |
GCCause::Cause _previous_cause; |
|
656 |
public: |
|
657 |
GCCauseSetter(CollectedHeap* heap, GCCause::Cause cause) { |
|
658 |
assert(SafepointSynchronize::is_at_safepoint(), |
|
659 |
"This method manipulates heap state without locking"); |
|
660 |
_heap = heap; |
|
661 |
_previous_cause = _heap->gc_cause(); |
|
662 |
_heap->set_gc_cause(cause); |
|
663 |
} |
|
664 |
||
665 |
~GCCauseSetter() { |
|
666 |
assert(SafepointSynchronize::is_at_safepoint(), |
|
667 |
"This method manipulates heap state without locking"); |
|
668 |
_heap->set_gc_cause(_previous_cause); |
|
669 |
} |
|
670 |
}; |
|
7397 | 671 |
|
672 |
#endif // SHARE_VM_GC_INTERFACE_COLLECTEDHEAP_HPP |