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annotate src/share/vm/ci/ciConstantPoolCache.cpp @ 3741:c76c13577460
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author | never |
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date | Thu, 26 May 2011 16:39:34 -0700 |
parents | f95d63e2154a |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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. | |
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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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 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" | |
0 | 30 |
31 // ciConstantPoolCache | |
32 // | |
33 // This class caches indexed constant pool lookups. | |
34 | |
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 } | |
43 | |
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 } | |
58 | |
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; | |
68 | |
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 } | |
82 | |
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 } | |
97 | |
98 // ------------------------------------------------------------------ | |
99 // ciConstantPoolCache::print | |
100 // | |
101 // Print debugging information about the cache. | |
102 void ciConstantPoolCache::print() { | |
103 Unimplemented(); | |
104 } |