1 /*
2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 #include "incls/_precompiled.incl"
26 #include "incls/_bytecode.cpp.incl"
27
28 // Implementation of Bytecode
29 // Should eventually get rid of these functions and use ThisRelativeObj methods instead
30
31 void Bytecode::set_code(Bytecodes::Code code) {
32 Bytecodes::check(code);
33 *addr_at(0) = u_char(code);
34 }
35
36
37 bool Bytecode::check_must_rewrite() const {
38 assert(Bytecodes::can_rewrite(code()), "post-check only");
39
40 // Some codes are conditionally rewriting. Look closely at them.
41 switch (code()) {
42 case Bytecodes::_aload_0:
43 // Even if RewriteFrequentPairs is turned on,
44 // the _aload_0 code might delay its rewrite until
45 // a following _getfield rewrites itself.
46 return false;
47
48 case Bytecodes::_lookupswitch:
49 return false; // the rewrite is not done by the interpreter
50
51 case Bytecodes::_new:
52 // (Could actually look at the class here, but the profit would be small.)
53 return false; // the rewrite is not always done
54 }
55
56 // No other special cases.
57 return true;
58 }
59
60
61
62 // Implementation of Bytecode_tableupswitch
63
64 int Bytecode_tableswitch::dest_offset_at(int i) const {
65 address x = aligned_addr_at(1);
66 int x2 = aligned_offset(1 + (3 + i)*jintSize);
67 int val = java_signed_word_at(x2);
68 return java_signed_word_at(aligned_offset(1 + (3 + i)*jintSize));
69 }
70
71
72 // Implementation of Bytecode_invoke
73
74 void Bytecode_invoke::verify() const {
75 Bytecodes::Code bc = adjusted_invoke_code();
76 assert(is_valid(), "check invoke");
77 }
78
79
80 symbolOop Bytecode_invoke::signature() const {
81 constantPoolOop constants = method()->constants();
82 return constants->signature_ref_at(index());
83 }
84
85
86 symbolOop Bytecode_invoke::name() const {
87 constantPoolOop constants = method()->constants();
88 return constants->name_ref_at(index());
89 }
90
91
92 BasicType Bytecode_invoke::result_type(Thread *thread) const {
93 symbolHandle sh(thread, signature());
94 ResultTypeFinder rts(sh);
95 rts.iterate();
96 return rts.type();
97 }
98
99
100 methodHandle Bytecode_invoke::static_target(TRAPS) {
101 methodHandle m;
102 KlassHandle resolved_klass;
103 constantPoolHandle constants(THREAD, _method->constants());
104
105 if (adjusted_invoke_code() != Bytecodes::_invokeinterface) {
106 LinkResolver::resolve_method(m, resolved_klass, constants, index(), CHECK_(methodHandle()));
107 } else {
108 LinkResolver::resolve_interface_method(m, resolved_klass, constants, index(), CHECK_(methodHandle()));
109 }
110 return m;
111 }
112
113
114 int Bytecode_invoke::index() const {
115 // Note: Rewriter::rewrite changes the Java_u2 of an invokedynamic to a native_u4,
116 // at the same time it allocates per-call-site CP cache entries.
117 if (has_giant_index())
118 return Bytes::get_native_u4(bcp() + 1);
119 else
120 return Bytes::get_Java_u2(bcp() + 1);
121 }
122
123
124 // Implementation of Bytecode_static
125
126 void Bytecode_static::verify() const {
127 assert(Bytecodes::java_code(code()) == Bytecodes::_putstatic
128 || Bytecodes::java_code(code()) == Bytecodes::_getstatic, "check static");
129 }
130
131
132 BasicType Bytecode_static::result_type(methodOop method) const {
133 int index = java_hwrd_at(1);
134 constantPoolOop constants = method->constants();
135 symbolOop field_type = constants->signature_ref_at(index);
136 BasicType basic_type = FieldType::basic_type(field_type);
137 return basic_type;
138 }
139
140
141 // Implementation of Bytecode_field
142
143 void Bytecode_field::verify() const {
144 Bytecodes::Code stdc = Bytecodes::java_code(code());
145 assert(stdc == Bytecodes::_putstatic || stdc == Bytecodes::_getstatic ||
146 stdc == Bytecodes::_putfield || stdc == Bytecodes::_getfield, "check field");
147 }
148
149
150 bool Bytecode_field::is_static() const {
151 Bytecodes::Code stdc = Bytecodes::java_code(code());
152 return stdc == Bytecodes::_putstatic || stdc == Bytecodes::_getstatic;
153 }
154
155
156 int Bytecode_field::index() const {
157 return java_hwrd_at(1);
158 }
159
160
161 // Implementation of Bytecodes loac constant
162
163 int Bytecode_loadconstant::index() const {
164 Bytecodes::Code stdc = Bytecodes::java_code(code());
165 return stdc == Bytecodes::_ldc ? java_byte_at(1) : java_hwrd_at(1);
166 }
167
168 //------------------------------------------------------------------------------
169 // Non-product code
170
171 #ifndef PRODUCT
172
173 void Bytecode_lookupswitch::verify() const {
174 switch (Bytecodes::java_code(code())) {
175 case Bytecodes::_lookupswitch:
176 { int i = number_of_pairs() - 1;
177 while (i-- > 0) {
178 assert(pair_at(i)->match() < pair_at(i+1)->match(), "unsorted table entries");
179 }
180 }
181 break;
182 default:
183 fatal("not a lookupswitch bytecode");
184 }
185 }
186
187 void Bytecode_tableswitch::verify() const {
188 switch (Bytecodes::java_code(code())) {
189 case Bytecodes::_tableswitch:
190 { int lo = low_key();
191 int hi = high_key();
192 assert (hi >= lo, "incorrect hi/lo values in tableswitch");
193 int i = hi - lo - 1 ;
194 while (i-- > 0) {
195 // no special check needed
196 }
197 }
198 break;
199 default:
200 fatal("not a tableswitch bytecode");
201 }
202 }
203
204 #endif