duke@435: /*
brutisso@3711:  * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_IMMUTABLESPACE_HPP
stefank@2314: #define SHARE_VM_GC_IMPLEMENTATION_SHARED_IMMUTABLESPACE_HPP
stefank@2314: 
stefank@2314: #include "memory/iterator.hpp"
stefank@2314: 
duke@435: // An ImmutableSpace is a viewport into a contiguous range
duke@435: // (or subrange) of previously allocated objects.
duke@435: 
duke@435: // Invariant: bottom() and end() are on page_size boundaries and
duke@435: // bottom() <= end()
duke@435: 
zgu@3900: class ImmutableSpace: public CHeapObj<mtGC> {
duke@435:   friend class VMStructs;
duke@435:  protected:
duke@435:   HeapWord* _bottom;
duke@435:   HeapWord* _end;
duke@435: 
duke@435:  public:
duke@435:   ImmutableSpace()                   { _bottom = NULL; _end = NULL;  }
duke@435:   HeapWord* bottom() const           { return _bottom;               }
duke@435:   HeapWord* end() const              { return _end;                  }
duke@435: 
duke@435:   MemRegion region() const { return MemRegion(bottom(), end()); }
duke@435: 
duke@435:   // Initialization
duke@435:   void initialize(MemRegion mr);
duke@435: 
duke@435:   bool contains(const void* p) const { return _bottom <= p && p < _end; }
duke@435: 
duke@435:   // Size computations.  Sizes are in bytes.
duke@435:   size_t capacity_in_bytes() const            { return capacity_in_words() * HeapWordSize; }
duke@435: 
duke@435:   // Size computations.  Sizes are in heapwords.
iveresov@808:   size_t capacity_in_words() const                { return pointer_delta(end(), bottom()); }
iveresov@808:   virtual size_t capacity_in_words(Thread*) const { return capacity_in_words(); }
duke@435: 
duke@435:   // Iteration.
coleenp@4037:   virtual void oop_iterate(ExtendedOopClosure* cl);
duke@435:   virtual void object_iterate(ObjectClosure* cl);
duke@435: 
duke@435:   // Debugging
duke@435:   virtual void print() const            PRODUCT_RETURN;
duke@435:   virtual void print_short() const      PRODUCT_RETURN;
brutisso@3711:   virtual void verify();
duke@435: };
stefank@2314: 
stefank@2314: #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_IMMUTABLESPACE_HPP