1 /*
   2  * Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  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 #include "precompiled.hpp"
  26 #include "gc/parallel/immutableSpace.hpp"
  27 #include "memory/universe.hpp"
  28 #include "oops/oop.inline.hpp"
  29 #include "utilities/macros.hpp"
  30 
  31 void ImmutableSpace::initialize(MemRegion mr) {
  32   HeapWord* bottom = mr.start();
  33   HeapWord* end    = mr.end();
  34 
  35   assert(Universe::on_page_boundary(bottom) && Universe::on_page_boundary(end),
  36          "invalid space boundaries");
  37 
  38   _bottom = bottom;
  39   _end = end;
  40 }
  41 
  42 void ImmutableSpace::oop_iterate(ExtendedOopClosure* cl) {
  43   HeapWord* obj_addr = bottom();
  44   HeapWord* t = end();
  45   // Could call objects iterate, but this is easier.
  46   while (obj_addr < t) {
  47     obj_addr += oop(obj_addr)->oop_iterate(cl);
  48   }
  49 }
  50 
  51 void ImmutableSpace::object_iterate(ObjectClosure* cl) {
  52   HeapWord* p = bottom();
  53   while (p < end()) {
  54     cl->do_object(oop(p));
  55     p += oop(p)->size();
  56   }
  57 }
  58 
  59 #ifndef PRODUCT
  60 
  61 void ImmutableSpace::print_short() const {
  62   tty->print(" space " SIZE_FORMAT "K, 100%% used", capacity_in_bytes() / K);
  63 }
  64 
  65 void ImmutableSpace::print() const {
  66   print_short();
  67   tty->print_cr(" [" INTPTR_FORMAT_W(#-6) "," INTPTR_FORMAT_W(#-6) ")", p2i(bottom()), p2i(end()));
  68 }
  69 
  70 #endif
  71 
  72 void ImmutableSpace::verify() {
  73   HeapWord* p = bottom();
  74   HeapWord* t = end();
  75   HeapWord* prev_p = NULL;
  76   while (p < t) {
  77     oop(p)->verify();
  78     prev_p = p;
  79     p += oop(p)->size();
  80   }
  81   guarantee(p == end(), "end of last object must match end of space");
  82 }