1 /* 2 * Copyright (c) 1999, 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 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "ci/ciCallSite.hpp" 27 #include "ci/ciConstant.hpp" 28 #include "ci/ciField.hpp" 29 #include "ci/ciStreams.hpp" 30 #include "ci/ciUtilities.hpp" 31 32 // ciExceptionHandlerStream 33 // 34 // Walk over some selected set of a methods exception handlers. 35 36 // ------------------------------------------------------------------ 37 // ciExceptionHandlerStream::count 38 // 39 // How many exception handlers are there in this stream? 40 // 41 // Implementation note: Compiler2 needs this functionality, so I had 42 int ciExceptionHandlerStream::count() { 43 int save_pos = _pos; 44 int save_end = _end; 45 46 int count = 0; 47 48 _pos = -1; 49 _end = _method->_handler_count; 50 51 52 next(); 53 while (!is_done()) { 54 count++; 55 next(); 56 } 57 58 _pos = save_pos; 59 _end = save_end; 60 61 return count; 62 } 63 64 int ciExceptionHandlerStream::count_remaining() { 65 int save_pos = _pos; 66 int save_end = _end; 67 68 int count = 0; 69 70 while (!is_done()) { 71 count++; 72 next(); 73 } 74 75 _pos = save_pos; 76 _end = save_end; 77 78 return count; 79 } 80 81 // ciBytecodeStream 82 // 83 // The class is used to iterate over the bytecodes of a method. 84 // It hides the details of constant pool structure/access by 85 // providing accessors for constant pool items. 86 87 // ------------------------------------------------------------------ 88 // ciBytecodeStream::next_wide_or_table 89 // 90 // Special handling for switch ops 91 Bytecodes::Code ciBytecodeStream::next_wide_or_table(Bytecodes::Code bc) { 92 switch (bc) { // Check for special bytecode handling 93 case Bytecodes::_wide: 94 // Special handling for the wide bytcode 95 // Get following bytecode; do not return wide 96 assert(Bytecodes::Code(_pc[0]) == Bytecodes::_wide, ""); 97 bc = Bytecodes::java_code(_raw_bc = (Bytecodes::Code)_pc[1]); 98 assert(Bytecodes::wide_length_for(bc) > 2, "must make progress"); 99 _pc += Bytecodes::wide_length_for(bc); 100 _was_wide = _pc; // Flag last wide bytecode found 101 assert(is_wide(), "accessor works right"); 102 break; 103 104 case Bytecodes::_lookupswitch: 105 _pc++; // Skip wide bytecode 106 _pc += (_start-_pc)&3; // Word align 107 _table_base = (jint*)_pc; // Capture for later usage 108 // table_base[0] is default far_dest 109 // Table has 2 lead elements (default, length), then pairs of u4 values. 110 // So load table length, and compute address at end of table 111 _pc = (address)&_table_base[2+ 2*Bytes::get_Java_u4((address)&_table_base[1])]; 112 break; 113 114 case Bytecodes::_tableswitch: { 115 _pc++; // Skip wide bytecode 116 _pc += (_start-_pc)&3; // Word align 117 _table_base = (jint*)_pc; // Capture for later usage 118 // table_base[0] is default far_dest 119 int lo = Bytes::get_Java_u4((address)&_table_base[1]);// Low bound 120 int hi = Bytes::get_Java_u4((address)&_table_base[2]);// High bound 121 int len = hi - lo + 1; // Dense table size 122 _pc = (address)&_table_base[3+len]; // Skip past table 123 break; 124 } 125 126 default: 127 fatal("unhandled bytecode"); 128 } 129 return bc; 130 } 131 132 // ------------------------------------------------------------------ 133 // ciBytecodeStream::reset_to_bci 134 void ciBytecodeStream::reset_to_bci( int bci ) { 135 _bc_start=_was_wide=0; 136 _pc = _start+bci; 137 } 138 139 // ------------------------------------------------------------------ 140 // ciBytecodeStream::force_bci 141 void ciBytecodeStream::force_bci(int bci) { 142 if (bci < 0) { 143 reset_to_bci(0); 144 _bc_start = _start + bci; 145 _bc = EOBC(); 146 } else { 147 reset_to_bci(bci); 148 next(); 149 } 150 } 151 152 153 // ------------------------------------------------------------------ 154 // Constant pool access 155 // ------------------------------------------------------------------ 156 157 // ------------------------------------------------------------------ 158 // ciBytecodeStream::get_klass_index 159 // 160 // If this bytecodes references a klass, return the index of the 161 // referenced klass. 162 int ciBytecodeStream::get_klass_index() const { 163 switch(cur_bc()) { 164 case Bytecodes::_ldc: 165 return get_index_u1(); 166 case Bytecodes::_ldc_w: 167 case Bytecodes::_ldc2_w: 168 case Bytecodes::_checkcast: 169 case Bytecodes::_instanceof: 170 case Bytecodes::_anewarray: 171 case Bytecodes::_multianewarray: 172 case Bytecodes::_new: 173 case Bytecodes::_newarray: 174 return get_index_u2(); 175 default: 176 ShouldNotReachHere(); 177 return 0; 178 } 179 } 180 181 // ------------------------------------------------------------------ 182 // ciBytecodeStream::get_klass 183 // 184 // If this bytecode is a new, newarray, multianewarray, instanceof, 185 // or checkcast, get the referenced klass. 186 ciKlass* ciBytecodeStream::get_klass(bool& will_link) { 187 VM_ENTRY_MARK; 188 constantPoolHandle cpool(_method->get_Method()->constants()); 189 return CURRENT_ENV->get_klass_by_index(cpool, get_klass_index(), will_link, _holder); 190 } 191 192 // ------------------------------------------------------------------ 193 // ciBytecodeStream::get_constant_raw_index 194 // 195 // If this bytecode is one of the ldc variants, get the index of the 196 // referenced constant. 197 int ciBytecodeStream::get_constant_raw_index() const { 198 // work-alike for Bytecode_loadconstant::raw_index() 199 switch (cur_bc()) { 200 case Bytecodes::_ldc: 201 return get_index_u1(); 202 case Bytecodes::_ldc_w: 203 case Bytecodes::_ldc2_w: 204 return get_index_u2(); 205 default: 206 ShouldNotReachHere(); 207 return 0; 208 } 209 } 210 211 // ------------------------------------------------------------------ 212 // ciBytecodeStream::get_constant_pool_index 213 // Decode any reference index into a regular pool index. 214 int ciBytecodeStream::get_constant_pool_index() const { 215 // work-alike for Bytecode_loadconstant::pool_index() 216 int index = get_constant_raw_index(); 217 if (has_cache_index()) { 218 VM_ENTRY_MARK; 219 constantPoolHandle cpool(_method->get_Method()->constants()); 220 return cpool->object_to_cp_index(index); 221 } 222 return index; 223 } 224 225 // ------------------------------------------------------------------ 226 // ciBytecodeStream::get_constant_cache_index 227 // Return the CP cache index, or -1 if there isn't any. 228 int ciBytecodeStream::get_constant_cache_index() const { 229 // work-alike for Bytecode_loadconstant::cache_index() 230 return has_cache_index() ? get_constant_raw_index() : -1; 231 } 232 233 // ------------------------------------------------------------------ 234 // ciBytecodeStream::get_constant 235 // 236 // If this bytecode is one of the ldc variants, get the referenced 237 // constant. 238 ciConstant ciBytecodeStream::get_constant() { 239 int pool_index = get_constant_raw_index(); 240 int cache_index = -1; 241 if (has_cache_index()) { 242 cache_index = pool_index; 243 pool_index = -1; 244 } 245 VM_ENTRY_MARK; 246 constantPoolHandle cpool(_method->get_Method()->constants()); 247 return CURRENT_ENV->get_constant_by_index(cpool, pool_index, cache_index, _holder); 248 } 249 250 // ------------------------------------------------------------------ 251 // ciBytecodeStream::get_constant_pool_tag 252 // 253 // If this bytecode is one of the ldc variants, get the referenced 254 // constant. 255 constantTag ciBytecodeStream::get_constant_pool_tag(int index) const { 256 VM_ENTRY_MARK; 257 return _method->get_Method()->constants()->tag_at(index); 258 } 259 260 // ------------------------------------------------------------------ 261 // ciBytecodeStream::get_field_index 262 // 263 // If this is a field access bytecode, get the constant pool 264 // index of the referenced field. 265 int ciBytecodeStream::get_field_index() { 266 assert(cur_bc() == Bytecodes::_getfield || 267 cur_bc() == Bytecodes::_putfield || 268 cur_bc() == Bytecodes::_getstatic || 269 cur_bc() == Bytecodes::_putstatic, "wrong bc"); 270 return get_index_u2_cpcache(); 271 } 272 273 274 // ------------------------------------------------------------------ 275 // ciBytecodeStream::get_field 276 // 277 // If this bytecode is one of get_field, get_static, put_field, 278 // or put_static, get the referenced field. 279 ciField* ciBytecodeStream::get_field(bool& will_link) { 280 ciField* f = CURRENT_ENV->get_field_by_index(_holder, get_field_index()); 281 will_link = f->will_link(_method, _bc); 282 return f; 283 } 284 285 286 // ------------------------------------------------------------------ 287 // ciBytecodeStream::get_declared_field_holder 288 // 289 // Get the declared holder of the currently referenced field. 290 // 291 // Usage note: the holder() of a ciField class returns the canonical 292 // holder of the field, rather than the holder declared in the 293 // bytecodes. 294 // 295 // There is no "will_link" result passed back. The user is responsible 296 // for checking linkability when retrieving the associated field. 297 ciInstanceKlass* ciBytecodeStream::get_declared_field_holder() { 298 VM_ENTRY_MARK; 299 constantPoolHandle cpool(_method->get_Method()->constants()); 300 int holder_index = get_field_holder_index(); 301 bool ignore; 302 return CURRENT_ENV->get_klass_by_index(cpool, holder_index, ignore, _holder) 303 ->as_instance_klass(); 304 } 305 306 // ------------------------------------------------------------------ 307 // ciBytecodeStream::get_field_holder_index 308 // 309 // Get the constant pool index of the declared holder of the field 310 // referenced by the current bytecode. Used for generating 311 // deoptimization information. 312 int ciBytecodeStream::get_field_holder_index() { 313 GUARDED_VM_ENTRY( 314 ConstantPool* cpool = _holder->get_instanceKlass()->constants(); 315 return cpool->klass_ref_index_at(get_field_index()); 316 ) 317 } 318 319 // ------------------------------------------------------------------ 320 // ciBytecodeStream::get_field_signature_index 321 // 322 // Get the constant pool index of the signature of the field 323 // referenced by the current bytecode. Used for generating 324 // deoptimization information. 325 int ciBytecodeStream::get_field_signature_index() { 326 VM_ENTRY_MARK; 327 ConstantPool* cpool = _holder->get_instanceKlass()->constants(); 328 int nt_index = cpool->name_and_type_ref_index_at(get_field_index()); 329 return cpool->signature_ref_index_at(nt_index); 330 } 331 332 // ------------------------------------------------------------------ 333 // ciBytecodeStream::get_method_index 334 // 335 // If this is a method invocation bytecode, get the constant pool 336 // index of the invoked method. 337 int ciBytecodeStream::get_method_index() { 338 #ifdef ASSERT 339 switch (cur_bc()) { 340 case Bytecodes::_invokeinterface: 341 case Bytecodes::_invokevirtual: 342 case Bytecodes::_invokespecial: 343 case Bytecodes::_invokestatic: 344 case Bytecodes::_invokedynamic: 345 break; 346 default: 347 ShouldNotReachHere(); 348 } 349 #endif 350 if (has_index_u4()) 351 return get_index_u4(); // invokedynamic 352 return get_index_u2_cpcache(); 353 } 354 355 // ------------------------------------------------------------------ 356 // ciBytecodeStream::get_method 357 // 358 // If this is a method invocation bytecode, get the invoked method. 359 // Additionally return the declared signature to get more concrete 360 // type information if required (Cf. invokedynamic and invokehandle). 361 ciMethod* ciBytecodeStream::get_method(bool& will_link, ciSignature* *declared_signature_result) { 362 VM_ENTRY_MARK; 363 ciEnv* env = CURRENT_ENV; 364 constantPoolHandle cpool(THREAD, _method->get_Method()->constants()); 365 ciMethod* m = env->get_method_by_index(cpool, get_method_index(), cur_bc(), _holder); 366 will_link = m->is_loaded(); 367 368 // Use the MethodType stored in the CP cache to create a signature 369 // with correct types (in respect to class loaders). 370 if (has_method_type()) { 371 ciSymbol* sig_sym = env->get_symbol(cpool->symbol_at(get_method_signature_index(cpool))); 372 ciKlass* pool_holder = env->get_klass(cpool->pool_holder()); 373 ciMethodType* method_type = get_method_type(); 374 ciSignature* declared_signature = new (env->arena()) ciSignature(pool_holder, sig_sym, method_type); 375 (*declared_signature_result) = declared_signature; 376 } else { 377 (*declared_signature_result) = m->signature(); 378 } 379 return m; 380 } 381 382 // ------------------------------------------------------------------ 383 // ciBytecodeStream::has_appendix 384 // 385 // Returns true if there is an appendix argument stored in the 386 // constant pool cache at the current bci. 387 bool ciBytecodeStream::has_appendix() { 388 VM_ENTRY_MARK; 389 constantPoolHandle cpool(_method->get_Method()->constants()); 390 return ConstantPool::has_appendix_at_if_loaded(cpool, get_method_index()); 391 } 392 393 // ------------------------------------------------------------------ 394 // ciBytecodeStream::get_appendix 395 // 396 // Return the appendix argument stored in the constant pool cache at 397 // the current bci. 398 ciObject* ciBytecodeStream::get_appendix() { 399 VM_ENTRY_MARK; 400 constantPoolHandle cpool(_method->get_Method()->constants()); 401 oop appendix_oop = ConstantPool::appendix_at_if_loaded(cpool, get_method_index()); 402 return CURRENT_ENV->get_object(appendix_oop); 403 } 404 405 // ------------------------------------------------------------------ 406 // ciBytecodeStream::has_method_type 407 // 408 // Returns true if there is a MethodType argument stored in the 409 // constant pool cache at the current bci. 410 bool ciBytecodeStream::has_method_type() { 411 GUARDED_VM_ENTRY( 412 constantPoolHandle cpool(_method->get_Method()->constants()); 413 return ConstantPool::has_method_type_at_if_loaded(cpool, get_method_index()); 414 ) 415 } 416 417 // ------------------------------------------------------------------ 418 // ciBytecodeStream::get_method_type 419 // 420 // Return the MethodType stored in the constant pool cache at 421 // the current bci. 422 ciMethodType* ciBytecodeStream::get_method_type() { 423 GUARDED_VM_ENTRY( 424 constantPoolHandle cpool(_method->get_Method()->constants()); 425 oop method_type_oop = ConstantPool::method_type_at_if_loaded(cpool, get_method_index()); 426 return CURRENT_ENV->get_object(method_type_oop)->as_method_type(); 427 ) 428 } 429 430 // ------------------------------------------------------------------ 431 // ciBytecodeStream::get_declared_method_holder 432 // 433 // Get the declared holder of the currently referenced method. 434 // 435 // Usage note: the holder() of a ciMethod class returns the canonical 436 // holder of the method, rather than the holder declared in the 437 // bytecodes. 438 // 439 // There is no "will_link" result passed back. The user is responsible 440 // for checking linkability when retrieving the associated method. 441 ciKlass* ciBytecodeStream::get_declared_method_holder() { 442 VM_ENTRY_MARK; 443 constantPoolHandle cpool(_method->get_Method()->constants()); 444 bool ignore; 445 // report as MethodHandle for invokedynamic, which is syntactically classless 446 if (cur_bc() == Bytecodes::_invokedynamic) 447 return CURRENT_ENV->get_klass_by_name(_holder, ciSymbol::java_lang_invoke_MethodHandle(), false); 448 return CURRENT_ENV->get_klass_by_index(cpool, get_method_holder_index(), ignore, _holder); 449 } 450 451 // ------------------------------------------------------------------ 452 // ciBytecodeStream::get_method_holder_index 453 // 454 // Get the constant pool index of the declared holder of the method 455 // referenced by the current bytecode. Used for generating 456 // deoptimization information. 457 int ciBytecodeStream::get_method_holder_index() { 458 ConstantPool* cpool = _method->get_Method()->constants(); 459 return cpool->klass_ref_index_at(get_method_index()); 460 } 461 462 // ------------------------------------------------------------------ 463 // ciBytecodeStream::get_method_signature_index 464 // 465 // Get the constant pool index of the signature of the method 466 // referenced by the current bytecode. Used for generating 467 // deoptimization information. 468 int ciBytecodeStream::get_method_signature_index(const constantPoolHandle& cpool) { 469 GUARDED_VM_ENTRY( 470 const int method_index = get_method_index(); 471 const int name_and_type_index = cpool->name_and_type_ref_index_at(method_index); 472 return cpool->signature_ref_index_at(name_and_type_index); 473 ) 474 } 475 476 // ------------------------------------------------------------------ 477 // ciBytecodeStream::get_resolved_references 478 ciObjArray* ciBytecodeStream::get_resolved_references() { 479 VM_ENTRY_MARK; 480 // Get the constant pool. 481 ConstantPool* cpool = _holder->get_instanceKlass()->constants(); 482 483 // Create a resolved references array and return it. 484 return CURRENT_ENV->get_object(cpool->resolved_references())->as_obj_array(); 485 }