1 /* 2 * Copyright 1999-2009 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/_ciStreams.cpp.incl" 27 28 // ciExceptionHandlerStream 29 // 30 // Walk over some selected set of a methods exception handlers. 31 32 // ------------------------------------------------------------------ 33 // ciExceptionHandlerStream::count 34 // 35 // How many exception handlers are there in this stream? 36 // 37 // Implementation note: Compiler2 needs this functionality, so I had 38 int ciExceptionHandlerStream::count() { 39 int save_pos = _pos; 40 int save_end = _end; 41 42 int count = 0; 43 44 _pos = -1; 45 _end = _method->_handler_count; 46 47 48 next(); 49 while (!is_done()) { 50 count++; 51 next(); 52 } 53 54 _pos = save_pos; 55 _end = save_end; 56 57 return count; 58 } 59 60 int ciExceptionHandlerStream::count_remaining() { 61 int save_pos = _pos; 62 int save_end = _end; 63 64 int count = 0; 65 66 while (!is_done()) { 67 count++; 68 next(); 69 } 70 71 _pos = save_pos; 72 _end = save_end; 73 74 return count; 75 } 76 77 // ciBytecodeStream 78 // 79 // The class is used to iterate over the bytecodes of a method. 80 // It hides the details of constant pool structure/access by 81 // providing accessors for constant pool items. 82 83 // ------------------------------------------------------------------ 84 // ciBytecodeStream::wide 85 // 86 // Special handling for the wide bytcode 87 Bytecodes::Code ciBytecodeStream::wide() 88 { 89 // Get following bytecode; do not return wide 90 Bytecodes::Code bc = (Bytecodes::Code)_pc[1]; 91 _pc += 2; // Skip both bytecodes 92 _pc += 2; // Skip index always 93 if( bc == Bytecodes::_iinc ) 94 _pc += 2; // Skip optional constant 95 _was_wide = _pc; // Flag last wide bytecode found 96 return bc; 97 } 98 99 // ------------------------------------------------------------------ 100 // ciBytecodeStream::table 101 // 102 // Special handling for switch ops 103 Bytecodes::Code ciBytecodeStream::table( Bytecodes::Code bc ) { 104 switch( bc ) { // Check for special bytecode handling 105 106 case Bytecodes::_lookupswitch: 107 _pc++; // Skip wide bytecode 108 _pc += (_start-_pc)&3; // Word align 109 _table_base = (jint*)_pc; // Capture for later usage 110 // table_base[0] is default far_dest 111 // Table has 2 lead elements (default, length), then pairs of u4 values. 112 // So load table length, and compute address at end of table 113 _pc = (address)&_table_base[2+ 2*Bytes::get_Java_u4((address)&_table_base[1])]; 114 break; 115 116 case Bytecodes::_tableswitch: { 117 _pc++; // Skip wide bytecode 118 _pc += (_start-_pc)&3; // Word align 119 _table_base = (jint*)_pc; // Capture for later usage 120 // table_base[0] is default far_dest 121 int lo = Bytes::get_Java_u4((address)&_table_base[1]);// Low bound 122 int hi = Bytes::get_Java_u4((address)&_table_base[2]);// High bound 123 int len = hi - lo + 1; // Dense table size 124 _pc = (address)&_table_base[3+len]; // Skip past table 125 break; 126 } 127 128 default: 129 fatal("unhandled bytecode"); 130 } 131 return bc; 132 } 133 134 // ------------------------------------------------------------------ 135 // ciBytecodeStream::reset_to_bci 136 void ciBytecodeStream::reset_to_bci( int bci ) { 137 _bc_start=_was_wide=0; 138 _pc = _start+bci; 139 } 140 141 // ------------------------------------------------------------------ 142 // ciBytecodeStream::force_bci 143 void ciBytecodeStream::force_bci(int bci) { 144 if (bci < 0) { 145 reset_to_bci(0); 146 _bc_start = _start + bci; 147 _bc = EOBC(); 148 } else { 149 reset_to_bci(bci); 150 next(); 151 } 152 } 153 154 155 // ------------------------------------------------------------------ 156 // Constant pool access 157 // ------------------------------------------------------------------ 158 159 // ------------------------------------------------------------------ 160 // ciBytecodeStream::get_klass_index 161 // 162 // If this bytecodes references a klass, return the index of the 163 // referenced klass. 164 int ciBytecodeStream::get_klass_index() const { 165 switch(cur_bc()) { 166 case Bytecodes::_ldc: 167 return get_index(); 168 case Bytecodes::_ldc_w: 169 case Bytecodes::_ldc2_w: 170 case Bytecodes::_checkcast: 171 case Bytecodes::_instanceof: 172 case Bytecodes::_anewarray: 173 case Bytecodes::_multianewarray: 174 case Bytecodes::_new: 175 case Bytecodes::_newarray: 176 return get_index_big(); 177 default: 178 ShouldNotReachHere(); 179 return 0; 180 } 181 } 182 183 // ------------------------------------------------------------------ 184 // ciBytecodeStream::get_klass 185 // 186 // If this bytecode is a new, newarray, multianewarray, instanceof, 187 // or checkcast, get the referenced klass. 188 ciKlass* ciBytecodeStream::get_klass(bool& will_link) { 189 return CURRENT_ENV->get_klass_by_index(_holder, get_klass_index(), 190 will_link); 191 } 192 193 // ------------------------------------------------------------------ 194 // ciBytecodeStream::get_constant_index 195 // 196 // If this bytecode is one of the ldc variants, get the index of the 197 // referenced constant. 198 int ciBytecodeStream::get_constant_index() const { 199 switch(cur_bc()) { 200 case Bytecodes::_ldc: 201 return get_index(); 202 case Bytecodes::_ldc_w: 203 case Bytecodes::_ldc2_w: 204 return get_index_big(); 205 default: 206 ShouldNotReachHere(); 207 return 0; 208 } 209 } 210 // ------------------------------------------------------------------ 211 // ciBytecodeStream::get_constant 212 // 213 // If this bytecode is one of the ldc variants, get the referenced 214 // constant. 215 ciConstant ciBytecodeStream::get_constant() { 216 return CURRENT_ENV->get_constant_by_index(_holder, get_constant_index()); 217 } 218 219 // ------------------------------------------------------------------ 220 bool ciBytecodeStream::is_unresolved_string() const { 221 return CURRENT_ENV->is_unresolved_string(_holder, get_constant_index()); 222 } 223 224 // ------------------------------------------------------------------ 225 bool ciBytecodeStream::is_unresolved_klass() const { 226 return CURRENT_ENV->is_unresolved_klass(_holder, get_klass_index()); 227 } 228 229 // ------------------------------------------------------------------ 230 // ciBytecodeStream::get_field_index 231 // 232 // If this is a field access bytecode, get the constant pool 233 // index of the referenced field. 234 int ciBytecodeStream::get_field_index() { 235 assert(cur_bc() == Bytecodes::_getfield || 236 cur_bc() == Bytecodes::_putfield || 237 cur_bc() == Bytecodes::_getstatic || 238 cur_bc() == Bytecodes::_putstatic, "wrong bc"); 239 return get_index_big(); 240 } 241 242 243 // ------------------------------------------------------------------ 244 // ciBytecodeStream::get_field 245 // 246 // If this bytecode is one of get_field, get_static, put_field, 247 // or put_static, get the referenced field. 248 ciField* ciBytecodeStream::get_field(bool& will_link) { 249 ciField* f = CURRENT_ENV->get_field_by_index(_holder, get_field_index()); 250 will_link = f->will_link(_holder, _bc); 251 return f; 252 } 253 254 255 // ------------------------------------------------------------------ 256 // ciBytecodeStream::get_declared_field_holder 257 // 258 // Get the declared holder of the currently referenced field. 259 // 260 // Usage note: the holder() of a ciField class returns the canonical 261 // holder of the field, rather than the holder declared in the 262 // bytecodes. 263 // 264 // There is no "will_link" result passed back. The user is responsible 265 // for checking linkability when retrieving the associated field. 266 ciInstanceKlass* ciBytecodeStream::get_declared_field_holder() { 267 int holder_index = get_field_holder_index(); 268 bool ignore; 269 return CURRENT_ENV->get_klass_by_index(_holder, holder_index, ignore) 270 ->as_instance_klass(); 271 } 272 273 // ------------------------------------------------------------------ 274 // ciBytecodeStream::get_field_holder_index 275 // 276 // Get the constant pool index of the declared holder of the field 277 // referenced by the current bytecode. Used for generating 278 // deoptimization information. 279 int ciBytecodeStream::get_field_holder_index() { 280 VM_ENTRY_MARK; 281 constantPoolOop cpool = _holder->get_instanceKlass()->constants(); 282 return cpool->klass_ref_index_at(get_field_index()); 283 } 284 285 // ------------------------------------------------------------------ 286 // ciBytecodeStream::get_field_signature_index 287 // 288 // Get the constant pool index of the signature of the field 289 // referenced by the current bytecode. Used for generating 290 // deoptimization information. 291 int ciBytecodeStream::get_field_signature_index() { 292 VM_ENTRY_MARK; 293 constantPoolOop cpool = _holder->get_instanceKlass()->constants(); 294 int nt_index = cpool->name_and_type_ref_index_at(get_field_index()); 295 return cpool->signature_ref_index_at(nt_index); 296 } 297 298 // ------------------------------------------------------------------ 299 // ciBytecodeStream::get_method_index 300 // 301 // If this is a method invocation bytecode, get the constant pool 302 // index of the invoked method. 303 int ciBytecodeStream::get_method_index() { 304 #ifdef ASSERT 305 switch (cur_bc()) { 306 case Bytecodes::_invokeinterface: 307 case Bytecodes::_invokevirtual: 308 case Bytecodes::_invokespecial: 309 case Bytecodes::_invokestatic: 310 case Bytecodes::_invokedynamic: 311 break; 312 default: 313 ShouldNotReachHere(); 314 } 315 #endif 316 return get_index_int(); 317 } 318 319 // ------------------------------------------------------------------ 320 // ciBytecodeStream::get_method 321 // 322 // If this is a method invocation bytecode, get the invoked method. 323 ciMethod* ciBytecodeStream::get_method(bool& will_link) { 324 ciMethod* m = CURRENT_ENV->get_method_by_index(_holder, get_method_index(),cur_bc()); 325 will_link = m->is_loaded(); 326 return m; 327 } 328 329 // ------------------------------------------------------------------ 330 // ciBytecodeStream::get_declared_method_holder 331 // 332 // Get the declared holder of the currently referenced method. 333 // 334 // Usage note: the holder() of a ciMethod class returns the canonical 335 // holder of the method, rather than the holder declared in the 336 // bytecodes. 337 // 338 // There is no "will_link" result passed back. The user is responsible 339 // for checking linkability when retrieving the associated method. 340 ciKlass* ciBytecodeStream::get_declared_method_holder() { 341 bool ignore; 342 // report as Dynamic for invokedynamic, which is syntactically classless 343 if (cur_bc() == Bytecodes::_invokedynamic) 344 return CURRENT_ENV->get_klass_by_name(_holder, ciSymbol::java_dyn_Dynamic(), false); 345 return CURRENT_ENV->get_klass_by_index(_holder, get_method_holder_index(), ignore); 346 } 347 348 // ------------------------------------------------------------------ 349 // ciBytecodeStream::get_method_holder_index 350 // 351 // Get the constant pool index of the declared holder of the method 352 // referenced by the current bytecode. Used for generating 353 // deoptimization information. 354 int ciBytecodeStream::get_method_holder_index() { 355 VM_ENTRY_MARK; 356 constantPoolOop cpool = _holder->get_instanceKlass()->constants(); 357 return cpool->klass_ref_index_at(get_method_index()); 358 } 359 360 // ------------------------------------------------------------------ 361 // ciBytecodeStream::get_method_signature_index 362 // 363 // Get the constant pool index of the signature of the method 364 // referenced by the current bytecode. Used for generating 365 // deoptimization information. 366 int ciBytecodeStream::get_method_signature_index() { 367 VM_ENTRY_MARK; 368 constantPoolOop cpool = _holder->get_instanceKlass()->constants(); 369 int method_index = get_method_index(); 370 int name_and_type_index = cpool->name_and_type_ref_index_at(method_index); 371 return cpool->signature_ref_index_at(name_and_type_index); 372 }