Mercurial > hg > truffle
annotate src/share/vm/prims/methodComparator.hpp @ 3763:e66f38dd58a9
Merge
author | ysr |
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date | Wed, 08 Jun 2011 08:39:53 -0700 |
parents | f95d63e2154a |
children | da91efe96a93 |
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0 | 1 /* |
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2 * Copyright (c) 2000, 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. | |
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 | |
1972 | 25 #ifndef SHARE_VM_PRIMS_METHODCOMPARATOR_HPP |
26 #define SHARE_VM_PRIMS_METHODCOMPARATOR_HPP | |
27 | |
28 #include "interpreter/bytecodeStream.hpp" | |
29 #include "oops/constantPoolOop.hpp" | |
30 #include "oops/methodOop.hpp" | |
31 | |
0 | 32 class BciMap; |
33 | |
34 // methodComparator provides an interface for determining if methods of | |
35 // different versions of classes are equivalent or switchable | |
36 | |
37 class MethodComparator { | |
38 private: | |
39 static BytecodeStream *_s_old, *_s_new; | |
40 static constantPoolOop _old_cp, _new_cp; | |
41 static BciMap *_bci_map; | |
42 static bool _switchable_test; | |
43 static GrowableArray<int> *_fwd_jmps; | |
44 | |
45 static bool args_same(Bytecodes::Code c_old, Bytecodes::Code c_new); | |
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46 static bool pool_constants_same(int cpi_old, int cpi_new); |
0 | 47 static int check_stack_and_locals_size(methodOop old_method, methodOop new_method); |
48 | |
49 public: | |
50 // Check if the new method is equivalent to the old one modulo constant pool (EMCP). | |
51 // Intuitive definition: two versions of the same method are EMCP, if they don't differ | |
52 // on the source code level. Practically, we check whether the only difference between | |
53 // method versions is some constantpool indices embedded into the bytecodes, and whether | |
54 // these indices eventually point to the same constants for both method versions. | |
55 static bool methods_EMCP(methodOop old_method, methodOop new_method); | |
56 | |
57 static bool methods_switchable(methodOop old_method, methodOop new_method, BciMap &bci_map); | |
58 }; | |
59 | |
60 | |
61 // ByteCode Index Map. For two versions of the same method, where the new version may contain | |
62 // fragments not found in the old version, provides a mapping from an index of a bytecode in | |
63 // the old method to the index of the same bytecode in the new method. | |
64 | |
65 class BciMap { | |
66 private: | |
67 int *_old_bci, *_new_st_bci, *_new_end_bci; | |
68 int _cur_size, _cur_pos; | |
69 int _pos; | |
70 | |
71 public: | |
72 BciMap() { | |
73 _cur_size = 50; | |
74 _old_bci = (int*) malloc(sizeof(int) * _cur_size); | |
75 _new_st_bci = (int*) malloc(sizeof(int) * _cur_size); | |
76 _new_end_bci = (int*) malloc(sizeof(int) * _cur_size); | |
77 _cur_pos = 0; | |
78 } | |
79 | |
80 ~BciMap() { | |
81 free(_old_bci); | |
82 free(_new_st_bci); | |
83 free(_new_end_bci); | |
84 } | |
85 | |
86 // Store the position of an added fragment, e.g. | |
87 // | |
88 // |<- old_bci | |
89 // ----------------------------------------- | |
90 // Old method |invokevirtual 5|aload 1|... | |
91 // ----------------------------------------- | |
92 // | |
93 // |<- new_st_bci |<- new_end_bci | |
94 // -------------------------------------------------------------------- | |
95 // New method |invokevirual 5|aload 2|invokevirtual 6|aload 1|... | |
96 // -------------------------------------------------------------------- | |
97 // ^^^^^^^^^^^^^^^^^^^^^^^^ | |
98 // Added fragment | |
99 | |
100 void store_fragment_location(int old_bci, int new_st_bci, int new_end_bci) { | |
101 if (_cur_pos == _cur_size) { | |
102 _cur_size += 10; | |
103 _old_bci = (int*) realloc(_old_bci, sizeof(int) * _cur_size); | |
104 _new_st_bci = (int*) realloc(_new_st_bci, sizeof(int) * _cur_size); | |
105 _new_end_bci = (int*) realloc(_new_end_bci, sizeof(int) * _cur_size); | |
106 } | |
107 _old_bci[_cur_pos] = old_bci; | |
108 _new_st_bci[_cur_pos] = new_st_bci; | |
109 _new_end_bci[_cur_pos] = new_end_bci; | |
110 _cur_pos++; | |
111 } | |
112 | |
113 int new_bci_for_old(int old_bci) { | |
114 if (_cur_pos == 0 || old_bci < _old_bci[0]) return old_bci; | |
115 _pos = 1; | |
116 while (_pos < _cur_pos && old_bci >= _old_bci[_pos]) | |
117 _pos++; | |
118 return _new_end_bci[_pos-1] + (old_bci - _old_bci[_pos-1]); | |
119 } | |
120 | |
121 // Test if two indexes - one in the old method and another in the new one - correspond | |
122 // to the same bytecode | |
123 bool old_and_new_locations_same(int old_dest_bci, int new_dest_bci) { | |
124 if (new_bci_for_old(old_dest_bci) == new_dest_bci) | |
125 return true; | |
126 else if (_old_bci[_pos-1] == old_dest_bci) | |
127 return (new_dest_bci == _new_st_bci[_pos-1]); | |
128 else return false; | |
129 } | |
130 }; | |
1972 | 131 |
132 #endif // SHARE_VM_PRIMS_METHODCOMPARATOR_HPP |