1 /*
2 * Copyright (c) 2000, 2015, 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 *
50 }
51
52 _old_cp = old_method->constants();
53 _new_cp = new_method->constants();
54 BytecodeStream s_old(old_method);
55 BytecodeStream s_new(new_method);
56 _s_old = &s_old;
57 _s_new = &s_new;
58 _switchable_test = false;
59 Bytecodes::Code c_old, c_new;
60
61 while ((c_old = s_old.next()) >= 0) {
62 if ((c_new = s_new.next()) < 0 || c_old != c_new)
63 return false;
64
65 if (! args_same(c_old, c_new))
66 return false;
67 }
68 return true;
69 }
70
71
72 bool MethodComparator::methods_switchable(Method* old_method, Method* new_method,
73 BciMap &bci_map) {
74 if (old_method->code_size() > new_method->code_size())
75 // Something has definitely been deleted in the new method, compared to the old one.
76 return false;
77
78 if (! check_stack_and_locals_size(old_method, new_method))
79 return false;
80
81 _old_cp = old_method->constants();
82 _new_cp = new_method->constants();
83 BytecodeStream s_old(old_method);
84 BytecodeStream s_new(new_method);
85 _s_old = &s_old;
86 _s_new = &s_new;
87 _bci_map = &bci_map;
88 _switchable_test = true;
89 GrowableArray<int> fwd_jmps(16);
90 _fwd_jmps = &fwd_jmps;
91 Bytecodes::Code c_old, c_new;
92
93 while ((c_old = s_old.next()) >= 0) {
94 if ((c_new = s_new.next()) < 0)
95 return false;
96 if (! (c_old == c_new && args_same(c_old, c_new))) {
97 int old_bci = s_old.bci();
98 int new_st_bci = s_new.bci();
99 bool found_match = false;
100 do {
101 c_new = s_new.next();
102 if (c_new == c_old && args_same(c_old, c_new)) {
103 found_match = true;
104 break;
105 }
106 } while (c_new >= 0);
107 if (! found_match)
108 return false;
109 int new_end_bci = s_new.bci();
110 bci_map.store_fragment_location(old_bci, new_st_bci, new_end_bci);
111 }
112 }
113
114 // Now we can test all forward jumps
115 for (int i = 0; i < fwd_jmps.length() / 2; i++) {
116 if (! bci_map.old_and_new_locations_same(fwd_jmps.at(i*2), fwd_jmps.at(i*2+1))) {
117 RC_TRACE(0x00800000,
118 ("Fwd jump miss: old dest = %d, calc new dest = %d, act new dest = %d",
119 fwd_jmps.at(i*2), bci_map.new_bci_for_old(fwd_jmps.at(i*2)),
120 fwd_jmps.at(i*2+1)));
121 return false;
122 }
123 }
124
125 return true;
126 }
127
128
129 bool MethodComparator::args_same(Bytecodes::Code c_old, Bytecodes::Code c_new) {
130 // BytecodeStream returns the correct standard Java bytecodes for various "fast"
131 // bytecode versions, so we don't have to bother about them here..
132 switch (c_old) {
133 case Bytecodes::_new : // fall through
134 case Bytecodes::_anewarray : // fall through
135 case Bytecodes::_multianewarray : // fall through
136 case Bytecodes::_checkcast : // fall through
137 case Bytecodes::_instanceof : {
138 u2 cpi_old = _s_old->get_index_u2();
139 u2 cpi_new = _s_new->get_index_u2();
140 if ((_old_cp->klass_at_noresolve(cpi_old) != _new_cp->klass_at_noresolve(cpi_new)))
141 return false;
142 if (c_old == Bytecodes::_multianewarray &&
143 *(jbyte*)(_s_old->bcp() + 3) != *(jbyte*)(_s_new->bcp() + 3))
144 return false;
145 break;
146 }
147
|
1 /*
2 * Copyright (c) 2000, 2016, 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 *
50 }
51
52 _old_cp = old_method->constants();
53 _new_cp = new_method->constants();
54 BytecodeStream s_old(old_method);
55 BytecodeStream s_new(new_method);
56 _s_old = &s_old;
57 _s_new = &s_new;
58 _switchable_test = false;
59 Bytecodes::Code c_old, c_new;
60
61 while ((c_old = s_old.next()) >= 0) {
62 if ((c_new = s_new.next()) < 0 || c_old != c_new)
63 return false;
64
65 if (! args_same(c_old, c_new))
66 return false;
67 }
68 return true;
69 }
70
71 bool MethodComparator::args_same(Bytecodes::Code c_old, Bytecodes::Code c_new) {
72 // BytecodeStream returns the correct standard Java bytecodes for various "fast"
73 // bytecode versions, so we don't have to bother about them here..
74 switch (c_old) {
75 case Bytecodes::_new : // fall through
76 case Bytecodes::_anewarray : // fall through
77 case Bytecodes::_multianewarray : // fall through
78 case Bytecodes::_checkcast : // fall through
79 case Bytecodes::_instanceof : {
80 u2 cpi_old = _s_old->get_index_u2();
81 u2 cpi_new = _s_new->get_index_u2();
82 if ((_old_cp->klass_at_noresolve(cpi_old) != _new_cp->klass_at_noresolve(cpi_new)))
83 return false;
84 if (c_old == Bytecodes::_multianewarray &&
85 *(jbyte*)(_s_old->bcp() + 3) != *(jbyte*)(_s_new->bcp() + 3))
86 return false;
87 break;
88 }
89
|