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comparison: src/share/vm/ci/ciStreams.cpp
src/share/vm/ci/ciStreams.cpp
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| 1 /* | |
| 2 * Copyright (c) 1999, 2012, 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(_holder, _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(_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())); | |
| 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() { | |
| 469 GUARDED_VM_ENTRY( | |
| 470 ConstantPool* cpool = _holder->get_instanceKlass()->constants(); | |
| 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 } |
