Mercurial > hg > graal-compiler
annotate src/share/vm/ci/ciConstantPoolCache.cpp @ 1766:02f0a9b6f654
6969586: OptimizeStringConcat: SIGSEGV in LoadNode::Value()
Reviewed-by: kvn
author | never |
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date | Mon, 30 Aug 2010 17:27:35 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
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0 | 1 /* |
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2 * Copyright (c) 1999, 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. | |
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 * | |
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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 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_ciConstantPoolCache.cpp.incl" | |
27 | |
28 // ciConstantPoolCache | |
29 // | |
30 // This class caches indexed constant pool lookups. | |
31 | |
32 // ------------------------------------------------------------------ | |
33 // ciConstantPoolCache::ciConstantPoolCache | |
34 ciConstantPoolCache::ciConstantPoolCache(Arena* arena, | |
35 int expected_size) { | |
36 _elements = | |
37 new (arena) GrowableArray<void*>(arena, expected_size, 0, 0); | |
38 _keys = new (arena) GrowableArray<intptr_t>(arena, expected_size, 0, 0); | |
39 } | |
40 | |
41 // ------------------------------------------------------------------ | |
42 // ciConstantPoolCache::get | |
43 // | |
44 // Get the entry at some index | |
45 void* ciConstantPoolCache::get(int index) { | |
46 ASSERT_IN_VM; | |
47 int pos = find(index); | |
48 if (pos >= _keys->length() || | |
49 _keys->at(pos) != index) { | |
50 // This element is not present in the cache. | |
51 return NULL; | |
52 } | |
53 return _elements->at(pos); | |
54 } | |
55 | |
56 // ------------------------------------------------------------------ | |
57 // ciConstantPoolCache::find | |
58 // | |
59 // Use binary search to find the position of this index in the cache. | |
60 // If there is no entry in the cache corresponding to this oop, return | |
61 // the position at which the index would be inserted. | |
62 int ciConstantPoolCache::find(int key) { | |
63 int min = 0; | |
64 int max = _keys->length()-1; | |
65 | |
66 while (max >= min) { | |
67 int mid = (max + min) / 2; | |
68 int value = _keys->at(mid); | |
69 if (value < key) { | |
70 min = mid + 1; | |
71 } else if (value > key) { | |
72 max = mid - 1; | |
73 } else { | |
74 return mid; | |
75 } | |
76 } | |
77 return min; | |
78 } | |
79 | |
80 // ------------------------------------------------------------------ | |
81 // ciConstantPoolCache::insert | |
82 // | |
83 // Insert a ciObject into the table at some index. | |
84 void ciConstantPoolCache::insert(int index, void* elem) { | |
85 int i; | |
86 int pos = find(index); | |
87 for (i = _keys->length()-1; i >= pos; i--) { | |
88 _keys->at_put_grow(i+1, _keys->at(i)); | |
89 _elements->at_put_grow(i+1, _elements->at(i)); | |
90 } | |
91 _keys->at_put_grow(pos, index); | |
92 _elements->at_put_grow(pos, elem); | |
93 } | |
94 | |
95 // ------------------------------------------------------------------ | |
96 // ciConstantPoolCache::print | |
97 // | |
98 // Print debugging information about the cache. | |
99 void ciConstantPoolCache::print() { | |
100 Unimplemented(); | |
101 } |