jdk8-mips64-public/hotspot: src/share/vm/memory/memRegion.hpp@ddce0b7cee93 (annotated)

src/share/vm/memory/memRegion.hpp@ddce0b7cee93 (annotated)

src/share/vm/memory/memRegion.hpp

Tue, 24 Feb 2015 15:04:52 -0500

author: dlong
date: Tue, 24 Feb 2015 15:04:52 -0500
changeset 7598: ddce0b7cee93
parent 5614: 9758d9f36299
child 6876: 710a3c8b516e
permissions: -rw-r--r--

8072383: resolve conflicts between open and closed ports
Summary: refactor close to remove references to closed ports
Reviewed-by: kvn, simonis, sgehwolf, dholmes

 /*
  * Copyright (c) 2000, 2013, 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_MEMORY_MEMREGION_HPP
 #define SHARE_VM_MEMORY_MEMREGION_HPP
 #include "memory/allocation.hpp"
 #include "utilities/debug.hpp"
 #include "utilities/globalDefinitions.hpp"
 // A very simple data structure representing a contigous region
 // region of address space.
 // Note that MemRegions are passed by value, not by reference.
 // The intent is that they remain very small and contain no
 // objects. _ValueObj should never be allocated in heap but we do
 // create MemRegions (in CardTableModRefBS) in heap so operator
 // new and operator new [] added for this special case.
 class MetaWord;
 class MemRegion VALUE_OBJ_CLASS_SPEC {
   friend class VMStructs;
 private:
   HeapWord* _start;
   size_t    _word_size;
 public:
   MemRegion() : _start(NULL), _word_size(0) {};
   MemRegion(HeapWord* start, size_t word_size) :
     _start(start), _word_size(word_size) {};
   MemRegion(HeapWord* start, HeapWord* end) :
     _start(start), _word_size(pointer_delta(end, start)) {
     assert(end >= start, "incorrect constructor arguments");
   }
   MemRegion(MetaWord* start, MetaWord* end) :
     _start((HeapWord*)start), _word_size(pointer_delta(end, start)) {
     assert(end >= start, "incorrect constructor arguments");
   }
   MemRegion(const MemRegion& mr): _start(mr._start), _word_size(mr._word_size) {}
   MemRegion intersection(const MemRegion mr2) const;
   // regions must overlap or be adjacent
   MemRegion _union(const MemRegion mr2) const;
   // minus will fail a guarantee if mr2 is interior to this,
   // since there's no way to return 2 disjoint regions.
   MemRegion minus(const MemRegion mr2) const;
   HeapWord* start() const { return _start; }
   HeapWord* end() const   { return _start + _word_size; }
   HeapWord* last() const  { return _start + _word_size - 1; }
   void set_start(HeapWord* start) { _start = start; }
   void set_end(HeapWord* end)     { _word_size = pointer_delta(end, _start); }
   void set_word_size(size_t word_size) {
     _word_size = word_size;
   }
   bool contains(const MemRegion mr2) const {
     return _start <= mr2._start && end() >= mr2.end();
   }
   bool contains(const void* addr) const {
     return addr >= (void*)_start && addr < (void*)end();
   }
   bool equals(const MemRegion mr2) const {
     // first disjunct since we do not have a canonical empty set
     return ((is_empty() && mr2.is_empty()) ||
             (start() == mr2.start() && end() == mr2.end()));
   }
   size_t byte_size() const { return _word_size * sizeof(HeapWord); }
   size_t word_size() const { return _word_size; }
   bool is_empty() const { return word_size() == 0; }
   void* operator new(size_t size) throw();
   void* operator new [](size_t size) throw();
   void  operator delete(void* p);
   void  operator delete [](void* p);
 };
 // For iteration over MemRegion's.
 class MemRegionClosure : public StackObj {
 public:
   virtual void do_MemRegion(MemRegion mr) = 0;
 };
 // A ResourceObj version of MemRegionClosure
 class MemRegionClosureRO: public MemRegionClosure {
 public:
   void* operator new(size_t size, ResourceObj::allocation_type type, MEMFLAGS flags) throw() {
         return ResourceObj::operator new(size, type, flags);
   }
   void* operator new(size_t size, Arena *arena) throw() {
         return ResourceObj::operator new(size, arena);
   }
   void* operator new(size_t size) throw() {
         return ResourceObj::operator new(size);
   }
   void  operator delete(void* p) {} // nothing to do
 };
 #endif // SHARE_VM_MEMORY_MEMREGION_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/memory/memRegion.hpp@ddce0b7cee93 (annotated)

src/share/vm/memory/memRegion.hpp