jdk8-mips64-public/hotspot: src/share/vm/oops/objArrayOop.hpp@2a1a77d3458f

     1 /*

     2  * Copyright 1997-2003 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    25 // An objArrayOop is an array containing oops.

    26 // Evaluating "String arg[10]" will create an objArrayOop.

    28 class objArrayOopDesc : public arrayOopDesc {

    29   friend class objArrayKlass;

    30   friend class Runtime1;

    31   friend class psPromotionManager;

    33   template <class T> T* obj_at_addr(int index) const {

    34     assert(is_within_bounds(index), "index out of bounds");

    35     return &((T*)base())[index];

    36   }

    38  public:

    39   // base is the address following the header.

    40   HeapWord* base() const      { return (HeapWord*) arrayOopDesc::base(T_OBJECT); }

    42   // Accessing

    43   oop obj_at(int index) const {

    44     // With UseCompressedOops decode the narrow oop in the objArray to an

    45     // uncompressed oop.  Otherwise this is simply a "*" operator.

    46     if (UseCompressedOops) {

    47       return load_decode_heap_oop(obj_at_addr<narrowOop>(index));

    48     } else {

    49       return load_decode_heap_oop(obj_at_addr<oop>(index));

    50     }

    51   }

    53   void obj_at_put(int index, oop value) {

    54     if (UseCompressedOops) {

    55       oop_store(obj_at_addr<narrowOop>(index), value);

    56     } else {

    57       oop_store(obj_at_addr<oop>(index), value);

    58     }

    59   }

    60   // Sizing

    61   static int header_size()    { return arrayOopDesc::header_size(T_OBJECT); }

    62   int object_size()           { return object_size(length()); }

    63   int array_size()            { return array_size(length()); }

    65   static int object_size(int length) {

    66     // This returns the object size in HeapWords.

    67     return align_object_size(header_size() + array_size(length));

    68   }

    70   // Give size of objArrayOop in HeapWords minus the header

    71   static int array_size(int length) {

    72     // Without UseCompressedOops, this is simply:

    73     // oop->length() * HeapWordsPerOop;

    74     // With narrowOops, HeapWordsPerOop is 1/2 or equal 0 as an integer.

    75     // The oop elements are aligned up to wordSize

    76     const int HeapWordsPerOop = heapOopSize/HeapWordSize;

    77     if (HeapWordsPerOop > 0) {

    78       return length * HeapWordsPerOop;

    79     } else {

    80       const int OopsPerHeapWord = HeapWordSize/heapOopSize;

    81       int word_len = align_size_up(length, OopsPerHeapWord)/OopsPerHeapWord;

    82       return word_len;

    83     }

    84   }

    86   // special iterators for index ranges, returns size of object

    87 #define ObjArrayOop_OOP_ITERATE_DECL(OopClosureType, nv_suffix)     \

    88   int oop_iterate_range(OopClosureType* blk, int start, int end);

    90   ALL_OOP_OOP_ITERATE_CLOSURES_1(ObjArrayOop_OOP_ITERATE_DECL)

    91   ALL_OOP_OOP_ITERATE_CLOSURES_3(ObjArrayOop_OOP_ITERATE_DECL)

    92 };

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