jdk8-mips64-public/hotspot: src/share/vm/oops/objArrayOop.hpp@cd5dbf694d45

6939134: JSR 292 adjustments to method handle invocation
Summary: split MethodHandle.invoke into invokeExact and invokeGeneric; also clean up JVM-to-Java interfaces
Reviewed-by: twisti

     1 /*

     2  * Copyright 1997-2009 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;

    32   friend class CSMarkOopClosure;

    33   friend class G1ParScanPartialArrayClosure;

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

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

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

    38   }

    40 private:

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

    42   static int array_size(int length) {

    43     const int OopsPerHeapWord = HeapWordSize/heapOopSize;

    44     assert(OopsPerHeapWord >= 1 && (HeapWordSize % heapOopSize == 0),

    45            "Else the following (new) computation would be in error");

    46 #ifdef ASSERT

    47     // The old code is left in for sanity-checking; it'll

    48     // go away pretty soon. XXX

    49     // Without UseCompressedOops, this is simply:

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

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

    52     // The oop elements are aligned up to wordSize

    53     const int HeapWordsPerOop = heapOopSize/HeapWordSize;

    54     int old_res;

    55     if (HeapWordsPerOop > 0) {

    56       old_res = length * HeapWordsPerOop;

    57     } else {

    58       old_res = align_size_up(length, OopsPerHeapWord)/OopsPerHeapWord;

    59     }

    60 #endif  // ASSERT

    61     int res = ((uint)length + OopsPerHeapWord - 1)/OopsPerHeapWord;

    62     assert(res == old_res, "Inconsistency between old and new.");

    63     return res;

    64   }

    66  public:

    67   // Returns the offset of the first element.

    68   static int base_offset_in_bytes() {

    69     return arrayOopDesc::base_offset_in_bytes(T_OBJECT);

    70   }

    72   // base is the address following the header.

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

    75   // Accessing

    76   oop obj_at(int index) const {

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

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

    79     if (UseCompressedOops) {

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

    81     } else {

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

    83     }

    84   }

    86   void obj_at_put(int index, oop value) {

    87     if (UseCompressedOops) {

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

    89     } else {

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

    91     }

    92   }

    93   // Sizing

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

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

    97   static int object_size(int length) {

    98     // This returns the object size in HeapWords.

    99     uint asz = array_size(length);

   100     uint osz = align_object_size(header_size() + asz);

   101     assert(osz >= asz,   "no overflow");

   102     assert((int)osz > 0, "no overflow");

   103     return (int)osz;

   104   }

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

   107 #define ObjArrayOop_OOP_ITERATE_DECL(OopClosureType, nv_suffix)     \

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

   110   ALL_OOP_OOP_ITERATE_CLOSURES_1(ObjArrayOop_OOP_ITERATE_DECL)

   111   ALL_OOP_OOP_ITERATE_CLOSURES_2(ObjArrayOop_OOP_ITERATE_DECL)

   112 };

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/oops/objArrayOop.hpp@cd5dbf694d45

src/share/vm/oops/objArrayOop.hpp