1 /* 2 * Copyright (c) 1997, 2019, 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 Method* 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 constantPoolHandle cp(THREAD, constants()); 165 return Handle(THREAD, cpce->appendix_if_resolved(cp)); 166 } 167 return Handle(); // usual case 168 } 169 170 int Bytecode_member_ref::index() const { 171 // Note: Rewriter::rewrite changes the Java_u2 of an invokedynamic to a native_u4, 172 // at the same time it allocates per-call-site CP cache entries. 173 Bytecodes::Code rawc = code(); 174 if (has_index_u4(rawc)) 175 return get_index_u4(rawc); 176 else 177 return get_index_u2_cpcache(rawc); 178 } 179 180 int Bytecode_member_ref::pool_index() const { 181 return cpcache_entry()->constant_pool_index(); 182 } 183 184 ConstantPoolCacheEntry* Bytecode_member_ref::cpcache_entry() const { 185 int index = this->index(); 186 return cpcache()->entry_at(ConstantPool::decode_cpcache_index(index, true)); 187 } 188 189 // Implementation of Bytecode_field 190 191 void Bytecode_field::verify() const { 192 assert(is_valid(), "check field"); 193 } 194 195 196 // Implementation of Bytecode_loadconstant 197 198 int Bytecode_loadconstant::raw_index() const { 199 Bytecodes::Code rawc = code(); 200 assert(rawc != Bytecodes::_wide, "verifier prevents this"); 201 if (Bytecodes::java_code(rawc) == Bytecodes::_ldc) 202 return get_index_u1(rawc); 203 else 204 return get_index_u2(rawc, false); 205 } 206 207 int Bytecode_loadconstant::pool_index() const { 208 int index = raw_index(); 209 if (has_cache_index()) { 210 return _method->constants()->object_to_cp_index(index); 211 } 212 return index; 213 } 214 215 BasicType Bytecode_loadconstant::result_type() const { 216 int index = pool_index(); 217 return _method->constants()->basic_type_for_constant_at(index); 218 } 219 220 oop Bytecode_loadconstant::resolve_constant(TRAPS) const { 221 assert(_method != NULL, "must supply method to resolve constant"); 222 int index = raw_index(); 223 ConstantPool* constants = _method->constants(); 224 if (has_cache_index()) { 225 return constants->resolve_cached_constant_at(index, THREAD); 226 } else if (_method->constants()->tag_at(index).is_dynamic_constant()) { 227 return constants->resolve_possibly_cached_constant_at(index, THREAD); 228 } else { 229 return constants->resolve_constant_at(index, THREAD); 230 } 231 } 232 233 //------------------------------------------------------------------------------ 234 // Non-product code 235 236 #ifndef PRODUCT 237 238 void Bytecode_lookupswitch::verify() const { 239 switch (Bytecodes::java_code(code())) { 240 case Bytecodes::_lookupswitch: 241 { int i = number_of_pairs() - 1; 242 while (i-- > 0) { 243 assert(pair_at(i).match() < pair_at(i+1).match(), "unsorted table entries"); 244 } 245 } 246 break; 247 default: 248 fatal("not a lookupswitch bytecode"); 249 } 250 } 251 252 void Bytecode_tableswitch::verify() const { 253 switch (Bytecodes::java_code(code())) { 254 case Bytecodes::_tableswitch: 255 { int lo = low_key(); 256 int hi = high_key(); 257 assert (hi >= lo, "incorrect hi/lo values in tableswitch"); 258 int i = hi - lo - 1 ; 259 while (i-- > 0) { 260 // no special check needed 261 } 262 } 263 break; 264 default: 265 fatal("not a tableswitch bytecode"); 266 } 267 } 268 269 #endif