1 /*
2 * Copyright (c) 1997, 2018, 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 *
23 */
24
25 #include "precompiled.hpp"
26 #include "interpreter/bytecode.inline.hpp"
27 #include "interpreter/linkResolver.hpp"
28 #include "oops/constantPool.hpp"
29 #include "oops/cpCache.inline.hpp"
30 #include "oops/oop.inline.hpp"
31 #include "runtime/fieldType.hpp"
32 #include "runtime/handles.inline.hpp"
33 #include "runtime/safepoint.hpp"
34 #include "runtime/signature.hpp"
35
36 // Implementation of Bytecode
37
38 #ifdef ASSERT
39
40 void Bytecode::assert_same_format_as(Bytecodes::Code testbc, bool is_wide) const {
41 Bytecodes::Code thisbc = Bytecodes::cast(byte_at(0));
42 if (thisbc == Bytecodes::_breakpoint) return; // let the assertion fail silently
43 if (is_wide) {
44 assert(thisbc == Bytecodes::_wide, "expected a wide instruction");
45 thisbc = Bytecodes::cast(byte_at(1));
46 if (thisbc == Bytecodes::_breakpoint) return;
47 }
48 int thisflags = Bytecodes::flags(testbc, is_wide) & Bytecodes::_all_fmt_bits;
49 int testflags = Bytecodes::flags(thisbc, is_wide) & Bytecodes::_all_fmt_bits;
50 if (thisflags != testflags)
51 tty->print_cr("assert_same_format_as(%d) failed on bc=%d%s; %d != %d",
52 (int)testbc, (int)thisbc, (is_wide?"/wide":""), testflags, thisflags);
53 assert(thisflags == testflags, "expected format");
54 }
55
56 void Bytecode::assert_index_size(int size, Bytecodes::Code bc, bool is_wide) {
57 int have_fmt = (Bytecodes::flags(bc, is_wide)
58 & (Bytecodes::_fmt_has_u2 | Bytecodes::_fmt_has_u4 |
59 Bytecodes::_fmt_not_simple |
60 // Not an offset field:
61 Bytecodes::_fmt_has_o));
62 int need_fmt = -1;
63 switch (size) {
64 case 1: need_fmt = 0; break;
65 case 2: need_fmt = Bytecodes::_fmt_has_u2; break;
66 case 4: need_fmt = Bytecodes::_fmt_has_u4; break;
67 }
68 if (is_wide) need_fmt |= Bytecodes::_fmt_not_simple;
69 if (have_fmt != need_fmt) {
70 tty->print_cr("assert_index_size %d: bc=%d%s %d != %d", size, bc, (is_wide?"/wide":""), have_fmt, need_fmt);
71 assert(have_fmt == need_fmt, "assert_index_size");
72 }
73 }
74
75 void Bytecode::assert_offset_size(int size, Bytecodes::Code bc, bool is_wide) {
76 int have_fmt = Bytecodes::flags(bc, is_wide) & Bytecodes::_all_fmt_bits;
77 int need_fmt = -1;
78 switch (size) {
79 case 2: need_fmt = Bytecodes::_fmt_bo2; break;
80 case 4: need_fmt = Bytecodes::_fmt_bo4; break;
81 }
82 if (is_wide) need_fmt |= Bytecodes::_fmt_not_simple;
83 if (have_fmt != need_fmt) {
84 tty->print_cr("assert_offset_size %d: bc=%d%s %d != %d", size, bc, (is_wide?"/wide":""), have_fmt, need_fmt);
85 assert(have_fmt == need_fmt, "assert_offset_size");
86 }
87 }
88
89 void Bytecode::assert_constant_size(int size, int where, Bytecodes::Code bc, bool is_wide) {
90 int have_fmt = Bytecodes::flags(bc, is_wide) & (Bytecodes::_all_fmt_bits
91 // Ignore any 'i' field (for iinc):
92 & ~Bytecodes::_fmt_has_i);
93 int need_fmt = -1;
94 switch (size) {
95 case 1: need_fmt = Bytecodes::_fmt_bc; break;
96 case 2: need_fmt = Bytecodes::_fmt_bc | Bytecodes::_fmt_has_u2; break;
97 }
98 if (is_wide) need_fmt |= Bytecodes::_fmt_not_simple;
99 int length = is_wide ? Bytecodes::wide_length_for(bc) : Bytecodes::length_for(bc);
100 if (have_fmt != need_fmt || where + size != length) {
101 tty->print_cr("assert_constant_size %d @%d: bc=%d%s %d != %d", size, where, bc, (is_wide?"/wide":""), have_fmt, need_fmt);
102 }
103 assert(have_fmt == need_fmt, "assert_constant_size");
104 assert(where + size == length, "assert_constant_size oob");
105 }
106
107 void Bytecode::assert_native_index(Bytecodes::Code bc, bool is_wide) {
108 assert((Bytecodes::flags(bc, is_wide) & Bytecodes::_fmt_has_nbo) != 0, "native index");
109 }
110
111 #endif //ASSERT
112
113 // Implementation of Bytecode_tableupswitch
114
115 int Bytecode_tableswitch::dest_offset_at(int i) const {
116 return get_aligned_Java_u4_at(1 + (3 + i)*jintSize);
117 }
118
119
120 // Implementation of Bytecode_invoke
121
122 void Bytecode_invoke::verify() const {
123 assert(is_valid(), "check invoke");
124 assert(cpcache() != NULL, "do not call this from verifier or rewriter");
125 }
126
127 int Bytecode_invoke::size_of_parameters() const {
128 ArgumentSizeComputer asc(signature());
129 return asc.size() + (has_receiver() ? 1 : 0);
130 }
131
132
133 Symbol* Bytecode_member_ref::klass() const {
134 return constants()->klass_ref_at_noresolve(index());
135 }
136
137
138 Symbol* Bytecode_member_ref::name() const {
139 return constants()->name_ref_at(index());
140 }
141
142
143 Symbol* Bytecode_member_ref::signature() const {
144 return constants()->signature_ref_at(index());
145 }
146
147
148 BasicType Bytecode_member_ref::result_type() const {
149 ResultTypeFinder rts(signature());
150 return rts.type();
151 }
152
153
154 methodHandle Bytecode_invoke::static_target(TRAPS) {
155 constantPoolHandle constants(THREAD, this->constants());
156
157 Bytecodes::Code bc = invoke_code();
158 return LinkResolver::resolve_method_statically(bc, constants, index(), THREAD);
159 }
160
161 Handle Bytecode_invoke::appendix(TRAPS) {
162 ConstantPoolCacheEntry* cpce = cpcache_entry();
163 if (cpce->has_appendix())
164 return Handle(THREAD, cpce->appendix_if_resolved(constants()));
165 return Handle(); // usual case
166 }
167
168 int Bytecode_member_ref::index() const {
169 // Note: Rewriter::rewrite changes the Java_u2 of an invokedynamic to a native_u4,
170 // at the same time it allocates per-call-site CP cache entries.
171 Bytecodes::Code rawc = code();
172 if (has_index_u4(rawc))
173 return get_index_u4(rawc);
174 else
175 return get_index_u2_cpcache(rawc);
176 }
177
178 int Bytecode_member_ref::pool_index() const {
179 return cpcache_entry()->constant_pool_index();
180 }
181
182 ConstantPoolCacheEntry* Bytecode_member_ref::cpcache_entry() const {
183 int index = this->index();
184 return cpcache()->entry_at(ConstantPool::decode_cpcache_index(index, true));
185 }
186
187 // Implementation of Bytecode_field
188
189 void Bytecode_field::verify() const {
190 assert(is_valid(), "check field");
191 }
192
193
194 // Implementation of Bytecode_loadconstant
195
196 int Bytecode_loadconstant::raw_index() const {
197 Bytecodes::Code rawc = code();
198 assert(rawc != Bytecodes::_wide, "verifier prevents this");
199 if (Bytecodes::java_code(rawc) == Bytecodes::_ldc)
200 return get_index_u1(rawc);
201 else
202 return get_index_u2(rawc, false);
203 }
204
205 int Bytecode_loadconstant::pool_index() const {
206 int index = raw_index();
207 if (has_cache_index()) {
208 return _method->constants()->object_to_cp_index(index);
209 }
210 return index;
211 }
212
213 BasicType Bytecode_loadconstant::result_type() const {
214 int index = pool_index();
215 return _method->constants()->basic_type_for_constant_at(index);
216 }
217
218 oop Bytecode_loadconstant::resolve_constant(TRAPS) const {
219 assert(_method != NULL, "must supply method to resolve constant");
220 int index = raw_index();
221 ConstantPool* constants = _method->constants();
222 if (has_cache_index()) {
223 return constants->resolve_cached_constant_at(index, THREAD);
224 } else if (_method->constants()->tag_at(index).is_dynamic_constant()) {
225 return constants->resolve_possibly_cached_constant_at(index, THREAD);
226 } else {
227 return constants->resolve_constant_at(index, THREAD);
228 }
229 }
230
231 //------------------------------------------------------------------------------
232 // Non-product code
233
234 #ifndef PRODUCT
235
236 void Bytecode_lookupswitch::verify() const {
237 switch (Bytecodes::java_code(code())) {
238 case Bytecodes::_lookupswitch:
239 { int i = number_of_pairs() - 1;
240 while (i-- > 0) {
241 assert(pair_at(i).match() < pair_at(i+1).match(), "unsorted table entries");
242 }
243 }
244 break;
245 default:
246 fatal("not a lookupswitch bytecode");
247 }
248 }
249
250 void Bytecode_tableswitch::verify() const {
251 switch (Bytecodes::java_code(code())) {
252 case Bytecodes::_tableswitch:
253 { int lo = low_key();
254 int hi = high_key();
255 assert (hi >= lo, "incorrect hi/lo values in tableswitch");
256 int i = hi - lo - 1 ;
257 while (i-- > 0) {
258 // no special check needed
259 }
260 }
261 break;
262 default:
263 fatal("not a tableswitch bytecode");
264 }
265 }
266
267 #endif