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src/hotspot/share/oops/objArrayOop.hpp

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rev 60648 : [mq]: partial_arrays
   1 /*
   2  * Copyright (c) 1997, 2019, 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 #ifndef SHARE_OOPS_OBJARRAYOOP_HPP
  26 #define SHARE_OOPS_OBJARRAYOOP_HPP
  27 
  28 #include "oops/arrayOop.hpp"
  29 #include "utilities/align.hpp"
  30 
  31 class Klass;
  32 
  33 // An objArrayOop is an array containing oops.
  34 // Evaluating "String arg[10]" will create an objArrayOop.
  35 
  36 class objArrayOopDesc : public arrayOopDesc {
  37   friend class ObjArrayKlass;
  38   friend class Runtime1;
  39   friend class psPromotionManager;
  40   friend class CSetMarkWordClosure;
  41   friend class G1ParScanPartialArrayClosure;
  42 
  43   template <class T> T* obj_at_addr(int index) const;
  44   template <class T> T* obj_at_addr_raw(int index) const;
  45 
  46   template <class T>
  47   static ptrdiff_t obj_at_offset(int index) {
  48     return base_offset_in_bytes() + sizeof(T) * index;
  49   }
  50 
  51 private:
  52   // Give size of objArrayOop in HeapWords minus the header
  53   static int array_size(int length) {
  54     const uint OopsPerHeapWord = HeapWordSize/heapOopSize;
  55     assert(OopsPerHeapWord >= 1 && (HeapWordSize % heapOopSize == 0),
  56            "Else the following (new) computation would be in error");
  57     uint res = ((uint)length + OopsPerHeapWord - 1)/OopsPerHeapWord;
  58 #ifdef ASSERT
  59     // The old code is left in for sanity-checking; it'll
  60     // go away pretty soon. XXX
  61     // Without UseCompressedOops, this is simply:


   1 /*
   2  * Copyright (c) 1997, 2020, 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 #ifndef SHARE_OOPS_OBJARRAYOOP_HPP
  26 #define SHARE_OOPS_OBJARRAYOOP_HPP
  27 
  28 #include "oops/arrayOop.hpp"
  29 #include "utilities/align.hpp"
  30 
  31 class Klass;
  32 
  33 // An objArrayOop is an array containing oops.
  34 // Evaluating "String arg[10]" will create an objArrayOop.
  35 
  36 class objArrayOopDesc : public arrayOopDesc {
  37   friend class ObjArrayKlass;
  38   friend class Runtime1;
  39   friend class psPromotionManager;
  40   friend class CSetMarkWordClosure;

  41 
  42   template <class T> T* obj_at_addr(int index) const;
  43   template <class T> T* obj_at_addr_raw(int index) const;
  44 
  45   template <class T>
  46   static ptrdiff_t obj_at_offset(int index) {
  47     return base_offset_in_bytes() + sizeof(T) * index;
  48   }
  49 
  50 private:
  51   // Give size of objArrayOop in HeapWords minus the header
  52   static int array_size(int length) {
  53     const uint OopsPerHeapWord = HeapWordSize/heapOopSize;
  54     assert(OopsPerHeapWord >= 1 && (HeapWordSize % heapOopSize == 0),
  55            "Else the following (new) computation would be in error");
  56     uint res = ((uint)length + OopsPerHeapWord - 1)/OopsPerHeapWord;
  57 #ifdef ASSERT
  58     // The old code is left in for sanity-checking; it'll
  59     // go away pretty soon. XXX
  60     // Without UseCompressedOops, this is simply:


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