jdk8-mips64-public/hotspot: src/share/vm/ci/ciConstantPoolCache.cpp@5eb9169b1a14

7092712: JSR 292: unloaded invokedynamic call sites can lead to a crash with signature types not on BCP
Reviewed-by: jrose, never

     1 /*

     2  * Copyright (c) 1999, 2010, 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  */

    25 #include "precompiled.hpp"

    26 #include "ci/ciConstantPoolCache.hpp"

    27 #include "ci/ciUtilities.hpp"

    28 #include "memory/allocation.hpp"

    29 #include "memory/allocation.inline.hpp"

    31 // ciConstantPoolCache

    32 //

    33 // This class caches indexed constant pool lookups.

    35 // ------------------------------------------------------------------

    36 // ciConstantPoolCache::ciConstantPoolCache

    37 ciConstantPoolCache::ciConstantPoolCache(Arena* arena,

    38                                  int expected_size) {

    39   _elements =

    40     new (arena) GrowableArray<void*>(arena, expected_size, 0, 0);

    41   _keys = new (arena) GrowableArray<intptr_t>(arena, expected_size, 0, 0);

    42 }

    44 // ------------------------------------------------------------------

    45 // ciConstantPoolCache::get

    46 //

    47 // Get the entry at some index

    48 void* ciConstantPoolCache::get(int index) {

    49   ASSERT_IN_VM;

    50   int pos = find(index);

    51   if (pos >= _keys->length() ||

    52       _keys->at(pos) != index) {

    53     // This element is not present in the cache.

    54     return NULL;

    55   }

    56   return _elements->at(pos);

    57 }

    59 // ------------------------------------------------------------------

    60 // ciConstantPoolCache::find

    61 //

    62 // Use binary search to find the position of this index in the cache.

    63 // If there is no entry in the cache corresponding to this oop, return

    64 // the position at which the index would be inserted.

    65 int ciConstantPoolCache::find(int key) {

    66   int min = 0;

    67   int max = _keys->length()-1;

    69   while (max >= min) {

    70     int mid = (max + min) / 2;

    71     int value = _keys->at(mid);

    72     if (value < key) {

    73       min = mid + 1;

    74     } else if (value > key) {

    75       max = mid - 1;

    76     } else {

    77       return mid;

    78     }

    79   }

    80   return min;

    81 }

    83 // ------------------------------------------------------------------

    84 // ciConstantPoolCache::insert

    85 //

    86 // Insert a ciObject into the table at some index.

    87 void ciConstantPoolCache::insert(int index, void* elem) {

    88   int i;

    89   int pos = find(index);

    90   for (i = _keys->length()-1; i >= pos; i--) {

    91     _keys->at_put_grow(i+1, _keys->at(i));

    92     _elements->at_put_grow(i+1, _elements->at(i));

    93   }

    94   _keys->at_put_grow(pos, index);

    95   _elements->at_put_grow(pos, elem);

    96 }

    98 // ------------------------------------------------------------------

    99 // ciConstantPoolCache::print

   100 //

   101 // Print debugging information about the cache.

   102 void ciConstantPoolCache::print() {

   103   Unimplemented();

   104 }

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