hotspot/src/share/vm/gc_implementation/parallelScavenge/psPromotionLAB.cpp

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rev 611 : Merge
   1 #ifdef USE_PRAGMA_IDENT_SRC
   2 #pragma ident "@(#)psPromotionLAB.cpp   1.17 07/05/05 17:05:30 JVM"
   3 #endif
   4 /*
   5  * Copyright 2002-2006 Sun Microsystems, Inc.  All Rights Reserved.
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This code is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License version 2 only, as
  10  * published by the Free Software Foundation.
  11  *
  12  * This code is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15  * version 2 for more details (a copy is included in the LICENSE file that
  16  * accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License version
  19  * 2 along with this work; if not, write to the Free Software Foundation,
  20  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *  
  26  */
  27 
  28 #include "incls/_precompiled.incl"
  29 #include "incls/_psPromotionLAB.cpp.incl"
  30 
  31 const size_t PSPromotionLAB::filler_header_size = align_object_size(typeArrayOopDesc::header_size(T_INT));
  32 
  33 // This is the shared initialization code. It sets up the basic pointers,
  34 // and allows enough extra space for a filler object. We call a virtual
  35 // method, "lab_is_valid()" to handle the different asserts the old/young
  36 // labs require. 
  37 void PSPromotionLAB::initialize(MemRegion lab) {
  38   assert(lab_is_valid(lab), "Sanity");
  39 
  40   HeapWord* bottom = lab.start();
  41   HeapWord* end    = lab.end();
  42 
  43   set_bottom(bottom);
  44   set_end(end);
  45   set_top(bottom);
  46 




  47   // We can be initialized to a zero size!
  48   if (free() > 0) {
  49     if (ZapUnusedHeapArea) {
  50       debug_only(Copy::fill_to_words(top(), free()/HeapWordSize, badHeapWord));
  51     }
  52     
  53     // NOTE! We need to allow space for a filler object.
  54     assert(lab.word_size() >= filler_header_size, "lab is too small");
  55     end = end - filler_header_size;
  56     set_end(end);
  57 
  58     _state = needs_flush;
  59   } else {
  60     _state = zero_size;
  61   }
  62 
  63   assert(this->top() <= this->end(), "pointers out of order");
  64 }
  65 
  66 // Fill all remaining lab space with an unreachable object.


   1 #ifdef USE_PRAGMA_IDENT_SRC
   2 #pragma ident "@(#)psPromotionLAB.cpp   1.17 07/05/05 17:05:30 JVM"
   3 #endif
   4 /*
   5  * Copyright 2002-2008 Sun Microsystems, Inc.  All Rights Reserved.
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This code is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License version 2 only, as
  10  * published by the Free Software Foundation.
  11  *
  12  * This code is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15  * version 2 for more details (a copy is included in the LICENSE file that
  16  * accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License version
  19  * 2 along with this work; if not, write to the Free Software Foundation,
  20  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *  
  26  */
  27 
  28 #include "incls/_precompiled.incl"
  29 #include "incls/_psPromotionLAB.cpp.incl"
  30 
  31 size_t PSPromotionLAB::filler_header_size;
  32 
  33 // This is the shared initialization code. It sets up the basic pointers,
  34 // and allows enough extra space for a filler object. We call a virtual
  35 // method, "lab_is_valid()" to handle the different asserts the old/young
  36 // labs require. 
  37 void PSPromotionLAB::initialize(MemRegion lab) {
  38   assert(lab_is_valid(lab), "Sanity");
  39 
  40   HeapWord* bottom = lab.start();
  41   HeapWord* end    = lab.end();
  42 
  43   set_bottom(bottom);
  44   set_end(end);
  45   set_top(bottom);
  46 
  47   // Initialize after VM starts up because header_size depends on compressed
  48   // oops.
  49   filler_header_size = align_object_size(typeArrayOopDesc::header_size(T_INT));
  50 
  51   // We can be initialized to a zero size!
  52   if (free() > 0) {
  53     if (ZapUnusedHeapArea) {
  54       debug_only(Copy::fill_to_words(top(), free()/HeapWordSize, badHeapWord));
  55     }
  56     
  57     // NOTE! We need to allow space for a filler object.
  58     assert(lab.word_size() >= filler_header_size, "lab is too small");
  59     end = end - filler_header_size;
  60     set_end(end);
  61 
  62     _state = needs_flush;
  63   } else {
  64     _state = zero_size;
  65   }
  66 
  67   assert(this->top() <= this->end(), "pointers out of order");
  68 }
  69 
  70 // Fill all remaining lab space with an unreachable object.