jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/heapRegionSet.hpp@f90c822e73f8 (annotated)

src/share/vm/gc_implementation/g1/heapRegionSet.hpp@f90c822e73f8 (annotated)

src/share/vm/gc_implementation/g1/heapRegionSet.hpp

Wed, 27 Apr 2016 01:25:04 +0800

author: aoqi
date: Wed, 27 Apr 2016 01:25:04 +0800
changeset 0: f90c822e73f8
child 6876: 710a3c8b516e
permissions: -rw-r--r--

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changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

 /*
  * Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSET_HPP
 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSET_HPP
 #include "gc_implementation/g1/heapRegion.hpp"
 // Large buffer for some cases where the output might be larger than normal.
 #define HRS_ERR_MSG_BUFSZ 512
 typedef FormatBuffer<HRS_ERR_MSG_BUFSZ> hrs_err_msg;
 // Set verification will be forced either if someone defines
 // HEAP_REGION_SET_FORCE_VERIFY to be 1, or in builds in which
 // asserts are compiled in.
 #ifndef HEAP_REGION_SET_FORCE_VERIFY
 #define HEAP_REGION_SET_FORCE_VERIFY defined(ASSERT)
 #endif // HEAP_REGION_SET_FORCE_VERIFY
 class hrs_ext_msg;
 class HRSMtSafeChecker : public CHeapObj<mtGC> {
 public:
   virtual void check() = 0;
 };
 class MasterFreeRegionListMtSafeChecker    : public HRSMtSafeChecker { public: void check(); };
 class SecondaryFreeRegionListMtSafeChecker : public HRSMtSafeChecker { public: void check(); };
 class HumongousRegionSetMtSafeChecker      : public HRSMtSafeChecker { public: void check(); };
 class OldRegionSetMtSafeChecker            : public HRSMtSafeChecker { public: void check(); };
 class HeapRegionSetCount VALUE_OBJ_CLASS_SPEC {
   friend class VMStructs;
   uint   _length;
   size_t _capacity;
 public:
   HeapRegionSetCount() : _length(0), _capacity(0) { }
   const uint   length()   const { return _length;   }
   const size_t capacity() const { return _capacity; }
   void increment(uint length_to_add, size_t capacity_to_add) {
     _length += length_to_add;
     _capacity += capacity_to_add;
   }
   void decrement(const uint length_to_remove, const size_t capacity_to_remove) {
     _length -= length_to_remove;
     _capacity -= capacity_to_remove;
   }
 };
 // Base class for all the classes that represent heap region sets. It
 // contains the basic attributes that each set needs to maintain
 // (e.g., length, region num, used bytes sum) plus any shared
 // functionality (e.g., verification).
 class HeapRegionSetBase VALUE_OBJ_CLASS_SPEC {
   friend class VMStructs;
 private:
   bool _is_humongous;
   bool _is_empty;
   HRSMtSafeChecker* _mt_safety_checker;
 protected:
   // The number of regions added to the set. If the set contains
   // only humongous regions, this reflects only 'starts humongous'
   // regions and does not include 'continues humongous' ones.
   HeapRegionSetCount _count;
   const char* _name;
   bool _verify_in_progress;
   // verify_region() is used to ensure that the contents of a region
   // added to / removed from a set are consistent.
   void verify_region(HeapRegion* hr) PRODUCT_RETURN;
   // Indicates whether all regions in the set should be humongous or
   // not. Only used during verification.
   bool regions_humongous() { return _is_humongous; }
   // Indicates whether all regions in the set should be empty or
   // not. Only used during verification.
   bool regions_empty() { return _is_empty; }
   void check_mt_safety() {
     if (_mt_safety_checker != NULL) {
       _mt_safety_checker->check();
     }
   }
   virtual void fill_in_ext_msg_extra(hrs_ext_msg* msg) { }
   HeapRegionSetBase(const char* name, bool humongous, bool empty, HRSMtSafeChecker* mt_safety_checker);
 public:
   const char* name() { return _name; }
   uint length() { return _count.length(); }
   bool is_empty() { return _count.length() == 0; }
   size_t total_capacity_bytes() {
     return _count.capacity();
   }
   // It updates the fields of the set to reflect hr being added to
   // the set and tags the region appropriately.
   inline void add(HeapRegion* hr);
   // It updates the fields of the set to reflect hr being removed
   // from the set and tags the region appropriately.
   inline void remove(HeapRegion* hr);
   // fill_in_ext_msg() writes the the values of the set's attributes
   // in the custom err_msg (hrs_ext_msg). fill_in_ext_msg_extra()
   // allows subclasses to append further information.
   void fill_in_ext_msg(hrs_ext_msg* msg, const char* message);
   virtual void verify();
   void verify_start();
   void verify_next_region(HeapRegion* hr);
   void verify_end();
 #if HEAP_REGION_SET_FORCE_VERIFY
   void verify_optional() {
     verify();
   }
 #else // HEAP_REGION_SET_FORCE_VERIFY
   void verify_optional() { }
 #endif // HEAP_REGION_SET_FORCE_VERIFY
   virtual void print_on(outputStream* out, bool print_contents = false);
 };
 // Customized err_msg for heap region sets. Apart from a
 // assert/guarantee-specific message it also prints out the values of
 // the fields of the associated set. This can be very helpful in
 // diagnosing failures.
 class hrs_ext_msg : public hrs_err_msg {
 public:
   hrs_ext_msg(HeapRegionSetBase* set, const char* message) : hrs_err_msg("%s","") {
     set->fill_in_ext_msg(this, message);
   }
 };
 #define hrs_assert_sets_match(_set1_, _set2_)                                 \
   do {                                                                        \
     assert(((_set1_)->regions_humongous() ==                                  \
                                             (_set2_)->regions_humongous()) && \
            ((_set1_)->regions_empty() == (_set2_)->regions_empty()),          \
            hrs_err_msg("the contents of set %s and set %s should match",      \
                        (_set1_)->name(), (_set2_)->name()));                  \
   } while (0)
 // This class represents heap region sets whose members are not
 // explicitly tracked. It's helpful to group regions using such sets
 // so that we can reason about all the region groups in the heap using
 // the same interface (namely, the HeapRegionSetBase API).
 class HeapRegionSet : public HeapRegionSetBase {
 public:
   HeapRegionSet(const char* name, bool humongous, HRSMtSafeChecker* mt_safety_checker):
     HeapRegionSetBase(name, humongous, false /* empty */, mt_safety_checker) { }
   void bulk_remove(const HeapRegionSetCount& removed) {
     _count.decrement(removed.length(), removed.capacity());
   }
 };
 // A set that links all the regions added to it in a doubly-linked
 // list. We should try to avoid doing operations that iterate over
 // such lists in performance critical paths. Typically we should
 // add / remove one region at a time or concatenate two lists. There are
 // two ways to treat your lists, ordered and un-ordered. All un-ordered
 // operations are done in constant time. To keep a list ordered only use
 // add_ordered() to add elements to the list. If a list is not ordered
 // from start, there is no way to sort it later.
 class FreeRegionListIterator;
 class FreeRegionList : public HeapRegionSetBase {
   friend class FreeRegionListIterator;
 private:
   HeapRegion* _head;
   HeapRegion* _tail;
   // _last is used to keep track of where we added an element the last
   // time in ordered lists. It helps to improve performance when adding
   // several ordered items in a row.
   HeapRegion* _last;
   static uint _unrealistically_long_length;
   void add_as_head_or_tail(FreeRegionList* from_list, bool as_head);
 protected:
   virtual void fill_in_ext_msg_extra(hrs_ext_msg* msg);
   // See the comment for HeapRegionSetBase::clear()
   virtual void clear();
 public:
   FreeRegionList(const char* name, HRSMtSafeChecker* mt_safety_checker = NULL):
     HeapRegionSetBase(name, false /* humongous */, true /* empty */, mt_safety_checker) {
     clear();
   }
   void verify_list();
   HeapRegion* head() { return _head; }
   HeapRegion* tail() { return _tail; }
   static void set_unrealistically_long_length(uint len);
   // Add hr to the list. The region should not be a member of another set.
   // Assumes that the list is ordered and will preserve that order. The order
   // is determined by hrs_index.
   inline void add_ordered(HeapRegion* hr);
   // It adds hr to the list as the new head. The region should not be
   // a member of another set.
   inline void add_as_head(HeapRegion* hr);
   // It adds hr to the list as the new tail. The region should not be
   // a member of another set.
   inline void add_as_tail(HeapRegion* hr);
   // It removes and returns the head of the list. It assumes that the
   // list is not empty so it will return a non-NULL value.
   inline HeapRegion* remove_head();
   // Convenience method.
   inline HeapRegion* remove_head_or_null();
   // Removes and returns the last element (_tail) of the list. It assumes
   // that the list isn't empty so that it can return a non-NULL value.
   inline HeapRegion* remove_tail();
   // Convenience method
   inline HeapRegion* remove_tail_or_null();
   // Removes from head or tail based on the given argument.
   inline HeapRegion* remove_region(bool from_head);
   // Merge two ordered lists. The result is also ordered. The order is
   // determined by hrs_index.
   void add_ordered(FreeRegionList* from_list);
   // It moves the regions from from_list to this list and empties
   // from_list. The new regions will appear in the same order as they
   // were in from_list and be linked in the beginning of this list.
   void add_as_head(FreeRegionList* from_list);
   // It moves the regions from from_list to this list and empties
   // from_list. The new regions will appear in the same order as they
   // were in from_list and be linked in the end of this list.
   void add_as_tail(FreeRegionList* from_list);
   // It empties the list by removing all regions from it.
   void remove_all();
   // It removes all regions in the list that are pending for removal
   // (i.e., they have been tagged with "pending_removal"). The list
   // must not be empty, target_count should reflect the exact number
   // of regions that are pending for removal in the list, and
   // target_count should be > 1 (currently, we never need to remove a
   // single region using this).
   void remove_all_pending(uint target_count);
   virtual void verify();
   virtual void print_on(outputStream* out, bool print_contents = false);
 };
 // Iterator class that provides a convenient way to iterate over the
 // regions of a HeapRegionLinkedList instance.
 class FreeRegionListIterator : public StackObj {
 private:
   FreeRegionList* _list;
   HeapRegion*     _curr;
 public:
   bool more_available() {
     return _curr != NULL;
   }
   HeapRegion* get_next() {
     assert(more_available(),
            "get_next() should be called when more regions are available");
     // If we are going to introduce a count in the iterator we should
     // do the "cycle" check.
     HeapRegion* hr = _curr;
     _list->verify_region(hr);
     _curr = hr->next();
     return hr;
   }
   FreeRegionListIterator(FreeRegionList* list) : _curr(NULL), _list(list) {
     _curr = list->head();
   }
 };
 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSET_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/g1/heapRegionSet.hpp@f90c822e73f8 (annotated)

src/share/vm/gc_implementation/g1/heapRegionSet.hpp