1 /* 2 * Copyright (c) 1999, 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 "ci/ciCallSite.hpp" 27 #include "ci/ciConstant.hpp" 28 #include "ci/ciField.hpp" 29 #include "ci/ciStreams.hpp" 30 #include "ci/ciUtilities.inline.hpp" 31 #include "runtime/handles.inline.hpp" 32 33 // ciExceptionHandlerStream 34 // 35 // Walk over some selected set of a methods exception handlers. 36 37 // ------------------------------------------------------------------ 38 // ciExceptionHandlerStream::count 39 // 40 // How many exception handlers are there in this stream? 41 // 42 // Implementation note: Compiler2 needs this functionality, so I had 43 int ciExceptionHandlerStream::count() { 44 int save_pos = _pos; 45 int save_end = _end; 46 47 int count = 0; 48 49 _pos = -1; 50 _end = _method->_handler_count; 51 52 53 next(); 54 while (!is_done()) { 55 count++; 56 next(); 57 } 58 59 _pos = save_pos; 60 _end = save_end; 61 62 return count; 63 } 64 65 int ciExceptionHandlerStream::count_remaining() { 66 int save_pos = _pos; 67 int save_end = _end; 68 69 int count = 0; 70 71 while (!is_done()) { 72 count++; 73 next(); 74 } 75 76 _pos = save_pos; 77 _end = save_end; 78 79 return count; 80 } 81 82 // ciBytecodeStream 83 // 84 // The class is used to iterate over the bytecodes of a method. 85 // It hides the details of constant pool structure/access by 86 // providing accessors for constant pool items. 87 88 // ------------------------------------------------------------------ 89 // ciBytecodeStream::next_wide_or_table 90 // 91 // Special handling for switch ops 92 Bytecodes::Code ciBytecodeStream::next_wide_or_table(Bytecodes::Code bc) { 93 switch (bc) { // Check for special bytecode handling 94 case Bytecodes::_wide: 95 // Special handling for the wide bytcode 96 // Get following bytecode; do not return wide 97 assert(Bytecodes::Code(_pc[0]) == Bytecodes::_wide, ""); 98 bc = Bytecodes::java_code(_raw_bc = (Bytecodes::Code)_pc[1]); 99 assert(Bytecodes::wide_length_for(bc) > 2, "must make progress"); 100 _pc += Bytecodes::wide_length_for(bc); 101 _was_wide = _pc; // Flag last wide bytecode found 102 assert(is_wide(), "accessor works right"); 103 break; 104 105 case Bytecodes::_lookupswitch: 106 _pc++; // Skip wide bytecode 107 _pc += (_start-_pc)&3; // Word align 108 _table_base = (jint*)_pc; // Capture for later usage 109 // table_base[0] is default far_dest 110 // Table has 2 lead elements (default, length), then pairs of u4 values. 111 // So load table length, and compute address at end of table 112 _pc = (address)&_table_base[2+ 2*Bytes::get_Java_u4((address)&_table_base[1])]; 113 break; 114 115 case Bytecodes::_tableswitch: { 116 _pc++; // Skip wide bytecode 117 _pc += (_start-_pc)&3; // Word align 118 _table_base = (jint*)_pc; // Capture for later usage 119 // table_base[0] is default far_dest 120 int lo = Bytes::get_Java_u4((address)&_table_base[1]);// Low bound 121 int hi = Bytes::get_Java_u4((address)&_table_base[2]);// High bound 122 int len = hi - lo + 1; // Dense table size 123 _pc = (address)&_table_base[3+len]; // Skip past table 124 break; 125 } 126 127 default: 128 fatal("unhandled bytecode"); 129 } 130 return bc; 131 } 132 133 // ------------------------------------------------------------------ 134 // ciBytecodeStream::reset_to_bci 135 void ciBytecodeStream::reset_to_bci( int bci ) { 136 _bc_start=_was_wide=0; 137 _pc = _start+bci; 138 } 139 140 // ------------------------------------------------------------------ 141 // ciBytecodeStream::force_bci 142 void ciBytecodeStream::force_bci(int bci) { 143 if (bci < 0) { 144 reset_to_bci(0); 145 _bc_start = _start + bci; 146 _bc = EOBC(); 147 } else { 148 reset_to_bci(bci); 149 next(); 150 } 151 } 152 153 154 // ------------------------------------------------------------------ 155 // Constant pool access 156 // ------------------------------------------------------------------ 157 158 // ------------------------------------------------------------------ 159 // ciBytecodeStream::get_klass_index 160 // 161 // If this bytecodes references a klass, return the index of the 162 // referenced klass. 163 int ciBytecodeStream::get_klass_index() const { 164 switch(cur_bc()) { 165 case Bytecodes::_ldc: 166 return get_index_u1(); 167 case Bytecodes::_ldc_w: 168 case Bytecodes::_ldc2_w: 169 case Bytecodes::_checkcast: 170 case Bytecodes::_instanceof: 171 case Bytecodes::_anewarray: 172 case Bytecodes::_multianewarray: 173 case Bytecodes::_new: 174 case Bytecodes::_newarray: 175 return get_index_u2(); 176 default: 177 ShouldNotReachHere(); 178 return 0; 179 } 180 } 181 182 // ------------------------------------------------------------------ 183 // ciBytecodeStream::get_klass 184 // 185 // If this bytecode is a new, newarray, multianewarray, instanceof, 186 // or checkcast, get the referenced klass. 187 ciKlass* ciBytecodeStream::get_klass(bool& will_link) { 188 VM_ENTRY_MARK; 189 constantPoolHandle cpool(_method->get_Method()->constants()); 190 return CURRENT_ENV->get_klass_by_index(cpool, get_klass_index(), will_link, _holder); 191 } 192 193 // ------------------------------------------------------------------ 194 // ciBytecodeStream::get_constant_raw_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_raw_index() const { 199 // work-alike for Bytecode_loadconstant::raw_index() 200 switch (cur_bc()) { 201 case Bytecodes::_ldc: 202 return get_index_u1(); 203 case Bytecodes::_ldc_w: 204 case Bytecodes::_ldc2_w: 205 return get_index_u2(); 206 default: 207 ShouldNotReachHere(); 208 return 0; 209 } 210 } 211 212 // ------------------------------------------------------------------ 213 // ciBytecodeStream::get_constant_pool_index 214 // Decode any reference index into a regular pool index. 215 int ciBytecodeStream::get_constant_pool_index() const { 216 // work-alike for Bytecode_loadconstant::pool_index() 217 int index = get_constant_raw_index(); 218 if (has_cache_index()) { 219 VM_ENTRY_MARK; 220 constantPoolHandle cpool(_method->get_Method()->constants()); 221 return cpool->object_to_cp_index(index); 222 } 223 return index; 224 } 225 226 // ------------------------------------------------------------------ 227 // ciBytecodeStream::get_constant_cache_index 228 // Return the CP cache index, or -1 if there isn't any. 229 int ciBytecodeStream::get_constant_cache_index() const { 230 // work-alike for Bytecode_loadconstant::cache_index() 231 return has_cache_index() ? get_constant_raw_index() : -1; 232 } 233 234 // ------------------------------------------------------------------ 235 // ciBytecodeStream::get_constant 236 // 237 // If this bytecode is one of the ldc variants, get the referenced 238 // constant. 239 ciConstant ciBytecodeStream::get_constant() { 240 int pool_index = get_constant_raw_index(); 241 int cache_index = -1; 242 if (has_cache_index()) { 243 cache_index = pool_index; 244 pool_index = -1; 245 } 246 VM_ENTRY_MARK; 247 constantPoolHandle cpool(_method->get_Method()->constants()); 248 return CURRENT_ENV->get_constant_by_index(cpool, pool_index, cache_index, _holder); 249 } 250 251 // ------------------------------------------------------------------ 252 // ciBytecodeStream::get_constant_pool_tag 253 // 254 // If this bytecode is one of the ldc variants, get the referenced 255 // constant. 256 constantTag ciBytecodeStream::get_constant_pool_tag(int index) const { 257 VM_ENTRY_MARK; 258 return _method->get_Method()->constants()->constant_tag_at(index); 259 } 260 261 // ------------------------------------------------------------------ 262 // ciBytecodeStream::get_field_index 263 // 264 // If this is a field access bytecode, get the constant pool 265 // index of the referenced field. 266 int ciBytecodeStream::get_field_index() { 267 assert(cur_bc() == Bytecodes::_getfield || 268 cur_bc() == Bytecodes::_putfield || 269 cur_bc() == Bytecodes::_getstatic || 270 cur_bc() == Bytecodes::_putstatic, "wrong bc"); 271 return get_index_u2_cpcache(); 272 } 273 274 275 // ------------------------------------------------------------------ 276 // ciBytecodeStream::get_field 277 // 278 // If this bytecode is one of get_field, get_static, put_field, 279 // or put_static, get the referenced field. 280 ciField* ciBytecodeStream::get_field(bool& will_link) { 281 ciField* f = CURRENT_ENV->get_field_by_index(_holder, get_field_index()); 282 will_link = f->will_link(_method, _bc); 283 return f; 284 } 285 286 287 // ------------------------------------------------------------------ 288 // ciBytecodeStream::get_declared_field_holder 289 // 290 // Get the declared holder of the currently referenced field. 291 // 292 // Usage note: the holder() of a ciField class returns the canonical 293 // holder of the field, rather than the holder declared in the 294 // bytecodes. 295 // 296 // There is no "will_link" result passed back. The user is responsible 297 // for checking linkability when retrieving the associated field. 298 ciInstanceKlass* ciBytecodeStream::get_declared_field_holder() { 299 VM_ENTRY_MARK; 300 constantPoolHandle cpool(_method->get_Method()->constants()); 301 int holder_index = get_field_holder_index(); 302 bool ignore; 303 return CURRENT_ENV->get_klass_by_index(cpool, holder_index, ignore, _holder) 304 ->as_instance_klass(); 305 } 306 307 // ------------------------------------------------------------------ 308 // ciBytecodeStream::get_field_holder_index 309 // 310 // Get the constant pool index of the declared holder of the field 311 // referenced by the current bytecode. Used for generating 312 // deoptimization information. 313 int ciBytecodeStream::get_field_holder_index() { 314 GUARDED_VM_ENTRY( 315 ConstantPool* cpool = _holder->get_instanceKlass()->constants(); 316 return cpool->klass_ref_index_at(get_field_index()); 317 ) 318 } 319 320 // ------------------------------------------------------------------ 321 // ciBytecodeStream::get_field_signature_index 322 // 323 // Get the constant pool index of the signature of the field 324 // referenced by the current bytecode. Used for generating 325 // deoptimization information. 326 int ciBytecodeStream::get_field_signature_index() { 327 VM_ENTRY_MARK; 328 ConstantPool* cpool = _holder->get_instanceKlass()->constants(); 329 int nt_index = cpool->name_and_type_ref_index_at(get_field_index()); 330 return cpool->signature_ref_index_at(nt_index); 331 } 332 333 // ------------------------------------------------------------------ 334 // ciBytecodeStream::get_method_index 335 // 336 // If this is a method invocation bytecode, get the constant pool 337 // index of the invoked method. 338 int ciBytecodeStream::get_method_index() { 339 #ifdef ASSERT 340 switch (cur_bc()) { 341 case Bytecodes::_invokeinterface: 342 case Bytecodes::_invokevirtual: 343 case Bytecodes::_invokespecial: 344 case Bytecodes::_invokestatic: 345 case Bytecodes::_invokedynamic: 346 break; 347 default: 348 ShouldNotReachHere(); 349 } 350 #endif 351 if (has_index_u4()) 352 return get_index_u4(); // invokedynamic 353 return get_index_u2_cpcache(); 354 } 355 356 // ------------------------------------------------------------------ 357 // ciBytecodeStream::get_method 358 // 359 // If this is a method invocation bytecode, get the invoked method. 360 // Additionally return the declared signature to get more concrete 361 // type information if required (Cf. invokedynamic and invokehandle). 362 ciMethod* ciBytecodeStream::get_method(bool& will_link, ciSignature* *declared_signature_result) { 363 VM_ENTRY_MARK; 364 ciEnv* env = CURRENT_ENV; 365 constantPoolHandle cpool(THREAD, _method->get_Method()->constants()); 366 ciMethod* m = env->get_method_by_index(cpool, get_method_index(), cur_bc(), _holder); 367 will_link = m->is_loaded(); 368 369 // Use the MethodType stored in the CP cache to create a signature 370 // with correct types (in respect to class loaders). 371 if (has_method_type()) { 372 ciSymbol* sig_sym = env->get_symbol(cpool->symbol_at(get_method_signature_index(cpool))); 373 ciKlass* pool_holder = env->get_klass(cpool->pool_holder()); 374 ciMethodType* method_type = get_method_type(); 375 ciSignature* declared_signature = new (env->arena()) ciSignature(pool_holder, sig_sym, method_type); 376 (*declared_signature_result) = declared_signature; 377 } else { 378 (*declared_signature_result) = m->signature(); 379 } 380 return m; 381 } 382 383 // ------------------------------------------------------------------ 384 // ciBytecodeStream::has_appendix 385 // 386 // Returns true if there is an appendix argument stored in the 387 // constant pool cache at the current bci. 388 bool ciBytecodeStream::has_appendix() { 389 VM_ENTRY_MARK; 390 constantPoolHandle cpool(_method->get_Method()->constants()); 391 return ConstantPool::has_appendix_at_if_loaded(cpool, get_method_index()); 392 } 393 394 // ------------------------------------------------------------------ 395 // ciBytecodeStream::get_appendix 396 // 397 // Return the appendix argument stored in the constant pool cache at 398 // the current bci. 399 ciObject* ciBytecodeStream::get_appendix() { 400 VM_ENTRY_MARK; 401 constantPoolHandle cpool(_method->get_Method()->constants()); 402 oop appendix_oop = ConstantPool::appendix_at_if_loaded(cpool, get_method_index()); 403 return CURRENT_ENV->get_object(appendix_oop); 404 } 405 406 // ------------------------------------------------------------------ 407 // ciBytecodeStream::has_method_type 408 // 409 // Returns true if there is a MethodType argument stored in the 410 // constant pool cache at the current bci. 411 bool ciBytecodeStream::has_method_type() { 412 GUARDED_VM_ENTRY( 413 constantPoolHandle cpool(_method->get_Method()->constants()); 414 return ConstantPool::has_method_type_at_if_loaded(cpool, get_method_index()); 415 ) 416 } 417 418 // ------------------------------------------------------------------ 419 // ciBytecodeStream::get_method_type 420 // 421 // Return the MethodType stored in the constant pool cache at 422 // the current bci. 423 ciMethodType* ciBytecodeStream::get_method_type() { 424 GUARDED_VM_ENTRY( 425 constantPoolHandle cpool(_method->get_Method()->constants()); 426 oop method_type_oop = ConstantPool::method_type_at_if_loaded(cpool, get_method_index()); 427 return CURRENT_ENV->get_object(method_type_oop)->as_method_type(); 428 ) 429 } 430 431 // ------------------------------------------------------------------ 432 // ciBytecodeStream::get_declared_method_holder 433 // 434 // Get the declared holder of the currently referenced method. 435 // 436 // Usage note: the holder() of a ciMethod class returns the canonical 437 // holder of the method, rather than the holder declared in the 438 // bytecodes. 439 // 440 // There is no "will_link" result passed back. The user is responsible 441 // for checking linkability when retrieving the associated method. 442 ciKlass* ciBytecodeStream::get_declared_method_holder() { 443 VM_ENTRY_MARK; 444 constantPoolHandle cpool(_method->get_Method()->constants()); 445 bool ignore; 446 // report as MethodHandle for invokedynamic, which is syntactically classless 447 if (cur_bc() == Bytecodes::_invokedynamic) 448 return CURRENT_ENV->get_klass_by_name(_holder, ciSymbol::java_lang_invoke_MethodHandle(), false); 449 return CURRENT_ENV->get_klass_by_index(cpool, get_method_holder_index(), ignore, _holder); 450 } 451 452 // ------------------------------------------------------------------ 453 // ciBytecodeStream::get_method_holder_index 454 // 455 // Get the constant pool index of the declared holder of the method 456 // referenced by the current bytecode. Used for generating 457 // deoptimization information. 458 int ciBytecodeStream::get_method_holder_index() { 459 ConstantPool* cpool = _method->get_Method()->constants(); 460 return cpool->klass_ref_index_at(get_method_index()); 461 } 462 463 // ------------------------------------------------------------------ 464 // ciBytecodeStream::get_method_signature_index 465 // 466 // Get the constant pool index of the signature of the method 467 // referenced by the current bytecode. Used for generating 468 // deoptimization information. 469 int ciBytecodeStream::get_method_signature_index(const constantPoolHandle& cpool) { 470 GUARDED_VM_ENTRY( 471 const int method_index = get_method_index(); 472 const int name_and_type_index = cpool->name_and_type_ref_index_at(method_index); 473 return cpool->signature_ref_index_at(name_and_type_index); 474 ) 475 } 476 477 // ------------------------------------------------------------------ 478 // ciBytecodeStream::get_resolved_references 479 ciObjArray* ciBytecodeStream::get_resolved_references() { 480 VM_ENTRY_MARK; 481 // Get the constant pool. 482 ConstantPool* cpool = _holder->get_instanceKlass()->constants(); 483 484 // Create a resolved references array and return it. 485 return CURRENT_ENV->get_object(cpool->resolved_references())->as_obj_array(); 486 }