1 /* 2 * Copyright (c) 1997, 2010, 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/interpreter.hpp" 27 #include "interpreter/interpreterGenerator.hpp" 28 #include "interpreter/interpreterRuntime.hpp" 29 #include "interpreter/templateTable.hpp" 30 31 #ifndef CC_INTERP 32 33 # define __ _masm-> 34 35 void TemplateInterpreter::initialize() { 36 if (_code != NULL) return; 37 // assertions 38 assert((int)Bytecodes::number_of_codes <= (int)DispatchTable::length, 39 "dispatch table too small"); 40 41 AbstractInterpreter::initialize(); 42 43 TemplateTable::initialize(); 44 45 // generate interpreter 46 { ResourceMark rm; 47 TraceTime timer("Interpreter generation", TraceStartupTime); 48 int code_size = InterpreterCodeSize; 49 NOT_PRODUCT(code_size *= 4;) // debug uses extra interpreter code space 50 _code = new StubQueue(new InterpreterCodeletInterface, code_size, NULL, 51 "Interpreter"); 52 InterpreterGenerator g(_code); 53 if (PrintInterpreter) print(); 54 } 55 56 // initialize dispatch table 57 _active_table = _normal_table; 58 } 59 60 //------------------------------------------------------------------------------------------------------------------------ 61 // Implementation of EntryPoint 62 63 EntryPoint::EntryPoint() { 64 assert(number_of_states == 9, "check the code below"); 65 _entry[btos] = NULL; 66 _entry[ctos] = NULL; 67 _entry[stos] = NULL; 68 _entry[atos] = NULL; 69 _entry[itos] = NULL; 70 _entry[ltos] = NULL; 71 _entry[ftos] = NULL; 72 _entry[dtos] = NULL; 73 _entry[vtos] = NULL; 74 } 75 76 77 EntryPoint::EntryPoint(address bentry, address centry, address sentry, address aentry, address ientry, address lentry, address fentry, address dentry, address ventry) { 78 assert(number_of_states == 9, "check the code below"); 79 _entry[btos] = bentry; 80 _entry[ctos] = centry; 81 _entry[stos] = sentry; 82 _entry[atos] = aentry; 83 _entry[itos] = ientry; 84 _entry[ltos] = lentry; 85 _entry[ftos] = fentry; 86 _entry[dtos] = dentry; 87 _entry[vtos] = ventry; 88 } 89 90 91 void EntryPoint::set_entry(TosState state, address entry) { 92 assert(0 <= state && state < number_of_states, "state out of bounds"); 93 _entry[state] = entry; 94 } 95 96 97 address EntryPoint::entry(TosState state) const { 98 assert(0 <= state && state < number_of_states, "state out of bounds"); 99 return _entry[state]; 100 } 101 102 103 void EntryPoint::print() { 104 tty->print("["); 105 for (int i = 0; i < number_of_states; i++) { 106 if (i > 0) tty->print(", "); 107 tty->print(INTPTR_FORMAT, _entry[i]); 108 } 109 tty->print("]"); 110 } 111 112 113 bool EntryPoint::operator == (const EntryPoint& y) { 114 int i = number_of_states; 115 while (i-- > 0) { 116 if (_entry[i] != y._entry[i]) return false; 117 } 118 return true; 119 } 120 121 122 //------------------------------------------------------------------------------------------------------------------------ 123 // Implementation of DispatchTable 124 125 EntryPoint DispatchTable::entry(int i) const { 126 assert(0 <= i && i < length, "index out of bounds"); 127 return 128 EntryPoint( 129 _table[btos][i], 130 _table[ctos][i], 131 _table[stos][i], 132 _table[atos][i], 133 _table[itos][i], 134 _table[ltos][i], 135 _table[ftos][i], 136 _table[dtos][i], 137 _table[vtos][i] 138 ); 139 } 140 141 142 void DispatchTable::set_entry(int i, EntryPoint& entry) { 143 assert(0 <= i && i < length, "index out of bounds"); 144 assert(number_of_states == 9, "check the code below"); 145 _table[btos][i] = entry.entry(btos); 146 _table[ctos][i] = entry.entry(ctos); 147 _table[stos][i] = entry.entry(stos); 148 _table[atos][i] = entry.entry(atos); 149 _table[itos][i] = entry.entry(itos); 150 _table[ltos][i] = entry.entry(ltos); 151 _table[ftos][i] = entry.entry(ftos); 152 _table[dtos][i] = entry.entry(dtos); 153 _table[vtos][i] = entry.entry(vtos); 154 } 155 156 157 bool DispatchTable::operator == (DispatchTable& y) { 158 int i = length; 159 while (i-- > 0) { 160 EntryPoint t = y.entry(i); // for compiler compatibility (BugId 4150096) 161 if (!(entry(i) == t)) return false; 162 } 163 return true; 164 } 165 166 address TemplateInterpreter::_remove_activation_entry = NULL; 167 address TemplateInterpreter::_remove_activation_preserving_args_entry = NULL; 168 169 170 address TemplateInterpreter::_throw_ArrayIndexOutOfBoundsException_entry = NULL; 171 address TemplateInterpreter::_throw_ArrayStoreException_entry = NULL; 172 address TemplateInterpreter::_throw_ArithmeticException_entry = NULL; 173 address TemplateInterpreter::_throw_ClassCastException_entry = NULL; 174 address TemplateInterpreter::_throw_WrongMethodType_entry = NULL; 175 address TemplateInterpreter::_throw_NullPointerException_entry = NULL; 176 address TemplateInterpreter::_throw_StackOverflowError_entry = NULL; 177 address TemplateInterpreter::_throw_exception_entry = NULL; 178 179 #ifndef PRODUCT 180 EntryPoint TemplateInterpreter::_trace_code; 181 #endif // !PRODUCT 182 EntryPoint TemplateInterpreter::_return_entry[TemplateInterpreter::number_of_return_entries]; 183 EntryPoint TemplateInterpreter::_earlyret_entry; 184 EntryPoint TemplateInterpreter::_deopt_entry [TemplateInterpreter::number_of_deopt_entries ]; 185 EntryPoint TemplateInterpreter::_continuation_entry; 186 EntryPoint TemplateInterpreter::_safept_entry; 187 188 address TemplateInterpreter::_return_3_addrs_by_index[TemplateInterpreter::number_of_return_addrs]; 189 address TemplateInterpreter::_return_5_addrs_by_index[TemplateInterpreter::number_of_return_addrs]; 190 191 DispatchTable TemplateInterpreter::_active_table; 192 DispatchTable TemplateInterpreter::_normal_table; 193 DispatchTable TemplateInterpreter::_safept_table; 194 address TemplateInterpreter::_wentry_point[DispatchTable::length]; 195 196 TemplateInterpreterGenerator::TemplateInterpreterGenerator(StubQueue* _code): AbstractInterpreterGenerator(_code) { 197 _unimplemented_bytecode = NULL; 198 _illegal_bytecode_sequence = NULL; 199 } 200 201 static const BasicType types[Interpreter::number_of_result_handlers] = { 202 T_BOOLEAN, 203 T_CHAR , 204 T_BYTE , 205 T_SHORT , 206 T_INT , 207 T_LONG , 208 T_VOID , 209 T_FLOAT , 210 T_DOUBLE , 211 T_OBJECT 212 }; 213 214 void TemplateInterpreterGenerator::generate_all() { 215 AbstractInterpreterGenerator::generate_all(); 216 217 { CodeletMark cm(_masm, "error exits"); 218 _unimplemented_bytecode = generate_error_exit("unimplemented bytecode"); 219 _illegal_bytecode_sequence = generate_error_exit("illegal bytecode sequence - method not verified"); 220 } 221 222 #ifndef PRODUCT 223 if (TraceBytecodes) { 224 CodeletMark cm(_masm, "bytecode tracing support"); 225 Interpreter::_trace_code = 226 EntryPoint( 227 generate_trace_code(btos), 228 generate_trace_code(ctos), 229 generate_trace_code(stos), 230 generate_trace_code(atos), 231 generate_trace_code(itos), 232 generate_trace_code(ltos), 233 generate_trace_code(ftos), 234 generate_trace_code(dtos), 235 generate_trace_code(vtos) 236 ); 237 } 238 #endif // !PRODUCT 239 240 { CodeletMark cm(_masm, "return entry points"); 241 for (int i = 0; i < Interpreter::number_of_return_entries; i++) { 242 Interpreter::_return_entry[i] = 243 EntryPoint( 244 generate_return_entry_for(itos, i), 245 generate_return_entry_for(itos, i), 246 generate_return_entry_for(itos, i), 247 generate_return_entry_for(atos, i), 248 generate_return_entry_for(itos, i), 249 generate_return_entry_for(ltos, i), 250 generate_return_entry_for(ftos, i), 251 generate_return_entry_for(dtos, i), 252 generate_return_entry_for(vtos, i) 253 ); 254 } 255 } 256 257 { CodeletMark cm(_masm, "earlyret entry points"); 258 Interpreter::_earlyret_entry = 259 EntryPoint( 260 generate_earlyret_entry_for(btos), 261 generate_earlyret_entry_for(ctos), 262 generate_earlyret_entry_for(stos), 263 generate_earlyret_entry_for(atos), 264 generate_earlyret_entry_for(itos), 265 generate_earlyret_entry_for(ltos), 266 generate_earlyret_entry_for(ftos), 267 generate_earlyret_entry_for(dtos), 268 generate_earlyret_entry_for(vtos) 269 ); 270 } 271 272 { CodeletMark cm(_masm, "deoptimization entry points"); 273 for (int i = 0; i < Interpreter::number_of_deopt_entries; i++) { 274 Interpreter::_deopt_entry[i] = 275 EntryPoint( 276 generate_deopt_entry_for(itos, i), 277 generate_deopt_entry_for(itos, i), 278 generate_deopt_entry_for(itos, i), 279 generate_deopt_entry_for(atos, i), 280 generate_deopt_entry_for(itos, i), 281 generate_deopt_entry_for(ltos, i), 282 generate_deopt_entry_for(ftos, i), 283 generate_deopt_entry_for(dtos, i), 284 generate_deopt_entry_for(vtos, i) 285 ); 286 } 287 } 288 289 { CodeletMark cm(_masm, "result handlers for native calls"); 290 // The various result converter stublets. 291 int is_generated[Interpreter::number_of_result_handlers]; 292 memset(is_generated, 0, sizeof(is_generated)); 293 294 for (int i = 0; i < Interpreter::number_of_result_handlers; i++) { 295 BasicType type = types[i]; 296 if (!is_generated[Interpreter::BasicType_as_index(type)]++) { 297 Interpreter::_native_abi_to_tosca[Interpreter::BasicType_as_index(type)] = generate_result_handler_for(type); 298 } 299 } 300 } 301 302 for (int j = 0; j < number_of_states; j++) { 303 const TosState states[] = {btos, ctos, stos, itos, ltos, ftos, dtos, atos, vtos}; 304 int index = Interpreter::TosState_as_index(states[j]); 305 Interpreter::_return_3_addrs_by_index[index] = Interpreter::return_entry(states[j], 3); 306 Interpreter::_return_5_addrs_by_index[index] = Interpreter::return_entry(states[j], 5); 307 } 308 309 { CodeletMark cm(_masm, "continuation entry points"); 310 Interpreter::_continuation_entry = 311 EntryPoint( 312 generate_continuation_for(btos), 313 generate_continuation_for(ctos), 314 generate_continuation_for(stos), 315 generate_continuation_for(atos), 316 generate_continuation_for(itos), 317 generate_continuation_for(ltos), 318 generate_continuation_for(ftos), 319 generate_continuation_for(dtos), 320 generate_continuation_for(vtos) 321 ); 322 } 323 324 { CodeletMark cm(_masm, "safepoint entry points"); 325 Interpreter::_safept_entry = 326 EntryPoint( 327 generate_safept_entry_for(btos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)), 328 generate_safept_entry_for(ctos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)), 329 generate_safept_entry_for(stos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)), 330 generate_safept_entry_for(atos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)), 331 generate_safept_entry_for(itos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)), 332 generate_safept_entry_for(ltos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)), 333 generate_safept_entry_for(ftos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)), 334 generate_safept_entry_for(dtos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)), 335 generate_safept_entry_for(vtos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)) 336 ); 337 } 338 339 { CodeletMark cm(_masm, "exception handling"); 340 // (Note: this is not safepoint safe because thread may return to compiled code) 341 generate_throw_exception(); 342 } 343 344 { CodeletMark cm(_masm, "throw exception entrypoints"); 345 Interpreter::_throw_ArrayIndexOutOfBoundsException_entry = generate_ArrayIndexOutOfBounds_handler("java/lang/ArrayIndexOutOfBoundsException"); 346 Interpreter::_throw_ArrayStoreException_entry = generate_klass_exception_handler("java/lang/ArrayStoreException" ); 347 Interpreter::_throw_ArithmeticException_entry = generate_exception_handler("java/lang/ArithmeticException" , "/ by zero"); 348 Interpreter::_throw_ClassCastException_entry = generate_ClassCastException_handler(); 349 Interpreter::_throw_WrongMethodType_entry = generate_WrongMethodType_handler(); 350 Interpreter::_throw_NullPointerException_entry = generate_exception_handler("java/lang/NullPointerException" , NULL ); 351 Interpreter::_throw_StackOverflowError_entry = generate_StackOverflowError_handler(); 352 } 353 354 355 356 #define method_entry(kind) \ 357 { CodeletMark cm(_masm, "method entry point (kind = " #kind ")"); \ 358 Interpreter::_entry_table[Interpreter::kind] = generate_method_entry(Interpreter::kind); \ 359 } 360 361 // all non-native method kinds 362 method_entry(zerolocals) 363 method_entry(zerolocals_synchronized) 364 method_entry(empty) 365 method_entry(accessor) 366 method_entry(abstract) 367 method_entry(method_handle) 368 method_entry(java_lang_math_sin ) 369 method_entry(java_lang_math_cos ) 370 method_entry(java_lang_math_tan ) 371 method_entry(java_lang_math_abs ) 372 method_entry(java_lang_math_sqrt ) 373 method_entry(java_lang_math_log ) 374 method_entry(java_lang_math_log10) 375 376 // all native method kinds (must be one contiguous block) 377 Interpreter::_native_entry_begin = Interpreter::code()->code_end(); 378 method_entry(native) 379 method_entry(native_synchronized) 380 Interpreter::_native_entry_end = Interpreter::code()->code_end(); 381 382 #undef method_entry 383 384 // Bytecodes 385 set_entry_points_for_all_bytes(); 386 set_safepoints_for_all_bytes(); 387 } 388 389 //------------------------------------------------------------------------------------------------------------------------ 390 391 address TemplateInterpreterGenerator::generate_error_exit(const char* msg) { 392 address entry = __ pc(); 393 __ stop(msg); 394 return entry; 395 } 396 397 398 //------------------------------------------------------------------------------------------------------------------------ 399 400 void TemplateInterpreterGenerator::set_entry_points_for_all_bytes() { 401 for (int i = 0; i < DispatchTable::length; i++) { 402 Bytecodes::Code code = (Bytecodes::Code)i; 403 if (Bytecodes::is_defined(code)) { 404 set_entry_points(code); 405 } else { 406 set_unimplemented(i); 407 } 408 } 409 } 410 411 412 void TemplateInterpreterGenerator::set_safepoints_for_all_bytes() { 413 for (int i = 0; i < DispatchTable::length; i++) { 414 Bytecodes::Code code = (Bytecodes::Code)i; 415 if (Bytecodes::is_defined(code)) Interpreter::_safept_table.set_entry(code, Interpreter::_safept_entry); 416 } 417 } 418 419 420 void TemplateInterpreterGenerator::set_unimplemented(int i) { 421 address e = _unimplemented_bytecode; 422 EntryPoint entry(e, e, e, e, e, e, e, e, e); 423 Interpreter::_normal_table.set_entry(i, entry); 424 Interpreter::_wentry_point[i] = _unimplemented_bytecode; 425 } 426 427 428 void TemplateInterpreterGenerator::set_entry_points(Bytecodes::Code code) { 429 CodeletMark cm(_masm, Bytecodes::name(code), code); 430 // initialize entry points 431 assert(_unimplemented_bytecode != NULL, "should have been generated before"); 432 assert(_illegal_bytecode_sequence != NULL, "should have been generated before"); 433 address bep = _illegal_bytecode_sequence; 434 address cep = _illegal_bytecode_sequence; 435 address sep = _illegal_bytecode_sequence; 436 address aep = _illegal_bytecode_sequence; 437 address iep = _illegal_bytecode_sequence; 438 address lep = _illegal_bytecode_sequence; 439 address fep = _illegal_bytecode_sequence; 440 address dep = _illegal_bytecode_sequence; 441 address vep = _unimplemented_bytecode; 442 address wep = _unimplemented_bytecode; 443 // code for short & wide version of bytecode 444 if (Bytecodes::is_defined(code)) { 445 Template* t = TemplateTable::template_for(code); 446 assert(t->is_valid(), "just checking"); 447 set_short_entry_points(t, bep, cep, sep, aep, iep, lep, fep, dep, vep); 448 } 449 if (Bytecodes::wide_is_defined(code)) { 450 Template* t = TemplateTable::template_for_wide(code); 451 assert(t->is_valid(), "just checking"); 452 set_wide_entry_point(t, wep); 453 } 454 // set entry points 455 EntryPoint entry(bep, cep, sep, aep, iep, lep, fep, dep, vep); 456 Interpreter::_normal_table.set_entry(code, entry); 457 Interpreter::_wentry_point[code] = wep; 458 } 459 460 461 void TemplateInterpreterGenerator::set_wide_entry_point(Template* t, address& wep) { 462 assert(t->is_valid(), "template must exist"); 463 assert(t->tos_in() == vtos, "only vtos tos_in supported for wide instructions"); 464 wep = __ pc(); generate_and_dispatch(t); 465 } 466 467 468 void TemplateInterpreterGenerator::set_short_entry_points(Template* t, address& bep, address& cep, address& sep, address& aep, address& iep, address& lep, address& fep, address& dep, address& vep) { 469 assert(t->is_valid(), "template must exist"); 470 switch (t->tos_in()) { 471 case btos: 472 case ctos: 473 case stos: 474 ShouldNotReachHere(); // btos/ctos/stos should use itos. 475 break; 476 case atos: vep = __ pc(); __ pop(atos); aep = __ pc(); generate_and_dispatch(t); break; 477 case itos: vep = __ pc(); __ pop(itos); iep = __ pc(); generate_and_dispatch(t); break; 478 case ltos: vep = __ pc(); __ pop(ltos); lep = __ pc(); generate_and_dispatch(t); break; 479 case ftos: vep = __ pc(); __ pop(ftos); fep = __ pc(); generate_and_dispatch(t); break; 480 case dtos: vep = __ pc(); __ pop(dtos); dep = __ pc(); generate_and_dispatch(t); break; 481 case vtos: set_vtos_entry_points(t, bep, cep, sep, aep, iep, lep, fep, dep, vep); break; 482 default : ShouldNotReachHere(); break; 483 } 484 } 485 486 487 //------------------------------------------------------------------------------------------------------------------------ 488 489 void TemplateInterpreterGenerator::generate_and_dispatch(Template* t, TosState tos_out) { 490 if (PrintBytecodeHistogram) histogram_bytecode(t); 491 #ifndef PRODUCT 492 // debugging code 493 if (CountBytecodes || TraceBytecodes || StopInterpreterAt > 0) count_bytecode(); 494 if (PrintBytecodePairHistogram) histogram_bytecode_pair(t); 495 if (TraceBytecodes) trace_bytecode(t); 496 if (StopInterpreterAt > 0) stop_interpreter_at(); 497 __ verify_FPU(1, t->tos_in()); 498 #endif // !PRODUCT 499 int step; 500 if (!t->does_dispatch()) { 501 step = t->is_wide() ? Bytecodes::wide_length_for(t->bytecode()) : Bytecodes::length_for(t->bytecode()); 502 if (tos_out == ilgl) tos_out = t->tos_out(); 503 // compute bytecode size 504 assert(step > 0, "just checkin'"); 505 // setup stuff for dispatching next bytecode 506 if (ProfileInterpreter && VerifyDataPointer 507 && methodDataOopDesc::bytecode_has_profile(t->bytecode())) { 508 __ verify_method_data_pointer(); 509 } 510 __ dispatch_prolog(tos_out, step); 511 } 512 // generate template 513 t->generate(_masm); 514 // advance 515 if (t->does_dispatch()) { 516 #ifdef ASSERT 517 // make sure execution doesn't go beyond this point if code is broken 518 __ should_not_reach_here(); 519 #endif // ASSERT 520 } else { 521 // dispatch to next bytecode 522 __ dispatch_epilog(tos_out, step); 523 } 524 } 525 526 //------------------------------------------------------------------------------------------------------------------------ 527 // Entry points 528 529 address TemplateInterpreter::return_entry(TosState state, int length) { 530 guarantee(0 <= length && length < Interpreter::number_of_return_entries, "illegal length"); 531 return _return_entry[length].entry(state); 532 } 533 534 535 address TemplateInterpreter::deopt_entry(TosState state, int length) { 536 guarantee(0 <= length && length < Interpreter::number_of_deopt_entries, "illegal length"); 537 return _deopt_entry[length].entry(state); 538 } 539 540 //------------------------------------------------------------------------------------------------------------------------ 541 // Suport for invokes 542 543 int TemplateInterpreter::TosState_as_index(TosState state) { 544 assert( state < number_of_states , "Invalid state in TosState_as_index"); 545 assert(0 <= (int)state && (int)state < TemplateInterpreter::number_of_return_addrs, "index out of bounds"); 546 return (int)state; 547 } 548 549 550 //------------------------------------------------------------------------------------------------------------------------ 551 // Safepoint suppport 552 553 static inline void copy_table(address* from, address* to, int size) { 554 // Copy non-overlapping tables. The copy has to occur word wise for MT safety. 555 while (size-- > 0) *to++ = *from++; 556 } 557 558 void TemplateInterpreter::notice_safepoints() { 559 if (!_notice_safepoints) { 560 // switch to safepoint dispatch table 561 _notice_safepoints = true; 562 copy_table((address*)&_safept_table, (address*)&_active_table, sizeof(_active_table) / sizeof(address)); 563 } 564 } 565 566 // switch from the dispatch table which notices safepoints back to the 567 // normal dispatch table. So that we can notice single stepping points, 568 // keep the safepoint dispatch table if we are single stepping in JVMTI. 569 // Note that the should_post_single_step test is exactly as fast as the 570 // JvmtiExport::_enabled test and covers both cases. 571 void TemplateInterpreter::ignore_safepoints() { 572 if (_notice_safepoints) { 573 if (!JvmtiExport::should_post_single_step()) { 574 // switch to normal dispatch table 575 _notice_safepoints = false; 576 copy_table((address*)&_normal_table, (address*)&_active_table, sizeof(_active_table) / sizeof(address)); 577 } 578 } 579 } 580 581 //------------------------------------------------------------------------------------------------------------------------ 582 // Deoptimization support 583 584 // If deoptimization happens, this function returns the point of next bytecode to continue execution 585 address TemplateInterpreter::deopt_continue_after_entry(methodOop method, address bcp, int callee_parameters, bool is_top_frame) { 586 return AbstractInterpreter::deopt_continue_after_entry(method, bcp, callee_parameters, is_top_frame); 587 } 588 589 // If deoptimization happens, this function returns the point where the interpreter reexecutes 590 // the bytecode. 591 // Note: Bytecodes::_athrow (C1 only) and Bytecodes::_return are the special cases 592 // that do not return "Interpreter::deopt_entry(vtos, 0)" 593 address TemplateInterpreter::deopt_reexecute_entry(methodOop method, address bcp) { 594 assert(method->contains(bcp), "just checkin'"); 595 Bytecodes::Code code = Bytecodes::java_code_at(bcp); 596 if (code == Bytecodes::_return) { 597 // This is used for deopt during registration of finalizers 598 // during Object.<init>. We simply need to resume execution at 599 // the standard return vtos bytecode to pop the frame normally. 600 // reexecuting the real bytecode would cause double registration 601 // of the finalizable object. 602 return _normal_table.entry(Bytecodes::_return).entry(vtos); 603 } else { 604 return AbstractInterpreter::deopt_reexecute_entry(method, bcp); 605 } 606 } 607 608 // If deoptimization happens, the interpreter should reexecute this bytecode. 609 // This function mainly helps the compilers to set up the reexecute bit. 610 bool TemplateInterpreter::bytecode_should_reexecute(Bytecodes::Code code) { 611 if (code == Bytecodes::_return) { 612 //Yes, we consider Bytecodes::_return as a special case of reexecution 613 return true; 614 } else { 615 return AbstractInterpreter::bytecode_should_reexecute(code); 616 } 617 } 618 619 #endif // !CC_INTERP