1 /* 2 * Copyright (c) 1997, 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 "classfile/javaClasses.inline.hpp" 27 #include "classfile/systemDictionary.hpp" 28 #include "classfile/vmSymbols.hpp" 29 #include "code/codeCache.hpp" 30 #include "compiler/compileBroker.hpp" 31 #include "compiler/disassembler.hpp" 32 #include "gc/shared/collectedHeap.hpp" 33 #include "interpreter/interpreter.hpp" 34 #include "interpreter/interpreterRuntime.hpp" 35 #include "interpreter/linkResolver.hpp" 36 #include "interpreter/templateTable.hpp" 37 #include "logging/log.hpp" 38 #include "memory/oopFactory.hpp" 39 #include "memory/resourceArea.hpp" 40 #include "memory/universe.inline.hpp" 41 #include "oops/constantPool.hpp" 42 #include "oops/instanceKlass.hpp" 43 #include "oops/methodData.hpp" 44 #include "oops/objArrayKlass.hpp" 45 #include "oops/objArrayOop.inline.hpp" 46 #include "oops/oop.inline.hpp" 47 #include "oops/symbol.hpp" 48 #include "prims/jvmtiExport.hpp" 49 #include "prims/nativeLookup.hpp" 50 #include "runtime/atomic.hpp" 51 #include "runtime/biasedLocking.hpp" 52 #include "runtime/compilationPolicy.hpp" 53 #include "runtime/deoptimization.hpp" 54 #include "runtime/fieldDescriptor.hpp" 55 #include "runtime/handles.inline.hpp" 56 #include "runtime/icache.hpp" 57 #include "runtime/interfaceSupport.hpp" 58 #include "runtime/java.hpp" 59 #include "runtime/jfieldIDWorkaround.hpp" 60 #include "runtime/osThread.hpp" 61 #include "runtime/sharedRuntime.hpp" 62 #include "runtime/stubRoutines.hpp" 63 #include "runtime/synchronizer.hpp" 64 #include "runtime/threadCritical.hpp" 65 #include "utilities/events.hpp" 66 #ifdef COMPILER2 67 #include "opto/runtime.hpp" 68 #endif 69 70 class UnlockFlagSaver { 71 private: 72 JavaThread* _thread; 73 bool _do_not_unlock; 74 public: 75 UnlockFlagSaver(JavaThread* t) { 76 _thread = t; 77 _do_not_unlock = t->do_not_unlock_if_synchronized(); 78 t->set_do_not_unlock_if_synchronized(false); 79 } 80 ~UnlockFlagSaver() { 81 _thread->set_do_not_unlock_if_synchronized(_do_not_unlock); 82 } 83 }; 84 85 //------------------------------------------------------------------------------------------------------------------------ 86 // State accessors 87 88 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread *thread) { 89 last_frame(thread).interpreter_frame_set_bcp(bcp); 90 if (ProfileInterpreter) { 91 // ProfileTraps uses MDOs independently of ProfileInterpreter. 92 // That is why we must check both ProfileInterpreter and mdo != NULL. 93 MethodData* mdo = last_frame(thread).interpreter_frame_method()->method_data(); 94 if (mdo != NULL) { 95 NEEDS_CLEANUP; 96 last_frame(thread).interpreter_frame_set_mdp(mdo->bci_to_dp(last_frame(thread).interpreter_frame_bci())); 97 } 98 } 99 } 100 101 //------------------------------------------------------------------------------------------------------------------------ 102 // Constants 103 104 105 IRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* thread, bool wide)) 106 // access constant pool 107 ConstantPool* pool = method(thread)->constants(); 108 int index = wide ? get_index_u2(thread, Bytecodes::_ldc_w) : get_index_u1(thread, Bytecodes::_ldc); 109 constantTag tag = pool->tag_at(index); 110 111 assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call"); 112 Klass* klass = pool->klass_at(index, CHECK); 113 oop java_class = klass->java_mirror(); 114 thread->set_vm_result(java_class); 115 IRT_END 116 117 IRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* thread, Bytecodes::Code bytecode)) { 118 assert(bytecode == Bytecodes::_fast_aldc || 119 bytecode == Bytecodes::_fast_aldc_w, "wrong bc"); 120 ResourceMark rm(thread); 121 methodHandle m (thread, method(thread)); 122 Bytecode_loadconstant ldc(m, bci(thread)); 123 oop result = ldc.resolve_constant(CHECK); 124 #ifdef ASSERT 125 { 126 // The bytecode wrappers aren't GC-safe so construct a new one 127 Bytecode_loadconstant ldc2(m, bci(thread)); 128 oop coop = m->constants()->resolved_references()->obj_at(ldc2.cache_index()); 129 assert(result == coop, "expected result for assembly code"); 130 } 131 #endif 132 thread->set_vm_result(result); 133 } 134 IRT_END 135 136 137 //------------------------------------------------------------------------------------------------------------------------ 138 // Allocation 139 140 IRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* thread, ConstantPool* pool, int index)) 141 Klass* k_oop = pool->klass_at(index, CHECK); 142 instanceKlassHandle klass (THREAD, k_oop); 143 144 // Make sure we are not instantiating an abstract klass 145 klass->check_valid_for_instantiation(true, CHECK); 146 147 // Make sure klass is initialized 148 klass->initialize(CHECK); 149 150 // At this point the class may not be fully initialized 151 // because of recursive initialization. If it is fully 152 // initialized & has_finalized is not set, we rewrite 153 // it into its fast version (Note: no locking is needed 154 // here since this is an atomic byte write and can be 155 // done more than once). 156 // 157 // Note: In case of classes with has_finalized we don't 158 // rewrite since that saves us an extra check in 159 // the fast version which then would call the 160 // slow version anyway (and do a call back into 161 // Java). 162 // If we have a breakpoint, then we don't rewrite 163 // because the _breakpoint bytecode would be lost. 164 oop obj = klass->allocate_instance(CHECK); 165 thread->set_vm_result(obj); 166 IRT_END 167 168 169 IRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* thread, BasicType type, jint size)) 170 oop obj = oopFactory::new_typeArray(type, size, CHECK); 171 thread->set_vm_result(obj); 172 IRT_END 173 174 175 IRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* thread, ConstantPool* pool, int index, jint size)) 176 Klass* klass = pool->klass_at(index, CHECK); 177 objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK); 178 thread->set_vm_result(obj); 179 IRT_END 180 181 182 IRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* thread, jint* first_size_address)) 183 // We may want to pass in more arguments - could make this slightly faster 184 ConstantPool* constants = method(thread)->constants(); 185 int i = get_index_u2(thread, Bytecodes::_multianewarray); 186 Klass* klass = constants->klass_at(i, CHECK); 187 int nof_dims = number_of_dimensions(thread); 188 assert(klass->is_klass(), "not a class"); 189 assert(nof_dims >= 1, "multianewarray rank must be nonzero"); 190 191 // We must create an array of jints to pass to multi_allocate. 192 ResourceMark rm(thread); 193 const int small_dims = 10; 194 jint dim_array[small_dims]; 195 jint *dims = &dim_array[0]; 196 if (nof_dims > small_dims) { 197 dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims); 198 } 199 for (int index = 0; index < nof_dims; index++) { 200 // offset from first_size_address is addressed as local[index] 201 int n = Interpreter::local_offset_in_bytes(index)/jintSize; 202 dims[index] = first_size_address[n]; 203 } 204 oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK); 205 thread->set_vm_result(obj); 206 IRT_END 207 208 209 IRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* thread, oopDesc* obj)) 210 assert(obj->is_oop(), "must be a valid oop"); 211 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise"); 212 InstanceKlass::register_finalizer(instanceOop(obj), CHECK); 213 IRT_END 214 215 216 // Quicken instance-of and check-cast bytecodes 217 IRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* thread)) 218 // Force resolving; quicken the bytecode 219 int which = get_index_u2(thread, Bytecodes::_checkcast); 220 ConstantPool* cpool = method(thread)->constants(); 221 // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded 222 // program we might have seen an unquick'd bytecode in the interpreter but have another 223 // thread quicken the bytecode before we get here. 224 // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" ); 225 Klass* klass = cpool->klass_at(which, CHECK); 226 thread->set_vm_result_2(klass); 227 IRT_END 228 229 230 //------------------------------------------------------------------------------------------------------------------------ 231 // Exceptions 232 233 void InterpreterRuntime::note_trap_inner(JavaThread* thread, int reason, 234 methodHandle trap_method, int trap_bci, TRAPS) { 235 if (trap_method.not_null()) { 236 MethodData* trap_mdo = trap_method->method_data(); 237 if (trap_mdo == NULL) { 238 Method::build_interpreter_method_data(trap_method, THREAD); 239 if (HAS_PENDING_EXCEPTION) { 240 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), 241 "we expect only an OOM error here"); 242 CLEAR_PENDING_EXCEPTION; 243 } 244 trap_mdo = trap_method->method_data(); 245 // and fall through... 246 } 247 if (trap_mdo != NULL) { 248 // Update per-method count of trap events. The interpreter 249 // is updating the MDO to simulate the effect of compiler traps. 250 Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason); 251 } 252 } 253 } 254 255 // Assume the compiler is (or will be) interested in this event. 256 // If necessary, create an MDO to hold the information, and record it. 257 void InterpreterRuntime::note_trap(JavaThread* thread, int reason, TRAPS) { 258 assert(ProfileTraps, "call me only if profiling"); 259 methodHandle trap_method(thread, method(thread)); 260 int trap_bci = trap_method->bci_from(bcp(thread)); 261 note_trap_inner(thread, reason, trap_method, trap_bci, THREAD); 262 } 263 264 #ifdef CC_INTERP 265 // As legacy note_trap, but we have more arguments. 266 IRT_ENTRY(void, InterpreterRuntime::note_trap(JavaThread* thread, int reason, Method *method, int trap_bci)) 267 methodHandle trap_method(method); 268 note_trap_inner(thread, reason, trap_method, trap_bci, THREAD); 269 IRT_END 270 271 // Class Deoptimization is not visible in BytecodeInterpreter, so we need a wrapper 272 // for each exception. 273 void InterpreterRuntime::note_nullCheck_trap(JavaThread* thread, Method *method, int trap_bci) 274 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_null_check, method, trap_bci); } 275 void InterpreterRuntime::note_div0Check_trap(JavaThread* thread, Method *method, int trap_bci) 276 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_div0_check, method, trap_bci); } 277 void InterpreterRuntime::note_rangeCheck_trap(JavaThread* thread, Method *method, int trap_bci) 278 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_range_check, method, trap_bci); } 279 void InterpreterRuntime::note_classCheck_trap(JavaThread* thread, Method *method, int trap_bci) 280 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_class_check, method, trap_bci); } 281 void InterpreterRuntime::note_arrayCheck_trap(JavaThread* thread, Method *method, int trap_bci) 282 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_array_check, method, trap_bci); } 283 #endif // CC_INTERP 284 285 286 static Handle get_preinitialized_exception(Klass* k, TRAPS) { 287 // get klass 288 InstanceKlass* klass = InstanceKlass::cast(k); 289 assert(klass->is_initialized(), 290 "this klass should have been initialized during VM initialization"); 291 // create instance - do not call constructor since we may have no 292 // (java) stack space left (should assert constructor is empty) 293 Handle exception; 294 oop exception_oop = klass->allocate_instance(CHECK_(exception)); 295 exception = Handle(THREAD, exception_oop); 296 if (StackTraceInThrowable) { 297 java_lang_Throwable::fill_in_stack_trace(exception); 298 } 299 return exception; 300 } 301 302 // Special handling for stack overflow: since we don't have any (java) stack 303 // space left we use the pre-allocated & pre-initialized StackOverflowError 304 // klass to create an stack overflow error instance. We do not call its 305 // constructor for the same reason (it is empty, anyway). 306 IRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* thread)) 307 Handle exception = get_preinitialized_exception( 308 SystemDictionary::StackOverflowError_klass(), 309 CHECK); 310 // Increment counter for hs_err file reporting 311 Atomic::inc(&Exceptions::_stack_overflow_errors); 312 THROW_HANDLE(exception); 313 IRT_END 314 315 IRT_ENTRY(void, InterpreterRuntime::throw_delayed_StackOverflowError(JavaThread* thread)) 316 Handle exception = get_preinitialized_exception( 317 SystemDictionary::StackOverflowError_klass(), 318 CHECK); 319 java_lang_Throwable::set_message(exception(), 320 Universe::delayed_stack_overflow_error_message()); 321 // Increment counter for hs_err file reporting 322 Atomic::inc(&Exceptions::_stack_overflow_errors); 323 THROW_HANDLE(exception); 324 IRT_END 325 326 IRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* thread, char* name, char* message)) 327 // lookup exception klass 328 TempNewSymbol s = SymbolTable::new_symbol(name, CHECK); 329 if (ProfileTraps) { 330 if (s == vmSymbols::java_lang_ArithmeticException()) { 331 note_trap(thread, Deoptimization::Reason_div0_check, CHECK); 332 } else if (s == vmSymbols::java_lang_NullPointerException()) { 333 note_trap(thread, Deoptimization::Reason_null_check, CHECK); 334 } 335 } 336 // create exception 337 Handle exception = Exceptions::new_exception(thread, s, message); 338 thread->set_vm_result(exception()); 339 IRT_END 340 341 342 IRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* thread, char* name, oopDesc* obj)) 343 ResourceMark rm(thread); 344 const char* klass_name = obj->klass()->external_name(); 345 // lookup exception klass 346 TempNewSymbol s = SymbolTable::new_symbol(name, CHECK); 347 if (ProfileTraps) { 348 note_trap(thread, Deoptimization::Reason_class_check, CHECK); 349 } 350 // create exception, with klass name as detail message 351 Handle exception = Exceptions::new_exception(thread, s, klass_name); 352 thread->set_vm_result(exception()); 353 IRT_END 354 355 356 IRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* thread, char* name, jint index)) 357 char message[jintAsStringSize]; 358 // lookup exception klass 359 TempNewSymbol s = SymbolTable::new_symbol(name, CHECK); 360 if (ProfileTraps) { 361 note_trap(thread, Deoptimization::Reason_range_check, CHECK); 362 } 363 // create exception 364 sprintf(message, "%d", index); 365 THROW_MSG(s, message); 366 IRT_END 367 368 IRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException( 369 JavaThread* thread, oopDesc* obj)) 370 371 ResourceMark rm(thread); 372 char* message = SharedRuntime::generate_class_cast_message( 373 thread, obj->klass()); 374 375 if (ProfileTraps) { 376 note_trap(thread, Deoptimization::Reason_class_check, CHECK); 377 } 378 379 // create exception 380 THROW_MSG(vmSymbols::java_lang_ClassCastException(), message); 381 IRT_END 382 383 // exception_handler_for_exception(...) returns the continuation address, 384 // the exception oop (via TLS) and sets the bci/bcp for the continuation. 385 // The exception oop is returned to make sure it is preserved over GC (it 386 // is only on the stack if the exception was thrown explicitly via athrow). 387 // During this operation, the expression stack contains the values for the 388 // bci where the exception happened. If the exception was propagated back 389 // from a call, the expression stack contains the values for the bci at the 390 // invoke w/o arguments (i.e., as if one were inside the call). 391 IRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* thread, oopDesc* exception)) 392 393 Handle h_exception(thread, exception); 394 methodHandle h_method (thread, method(thread)); 395 constantPoolHandle h_constants(thread, h_method->constants()); 396 bool should_repeat; 397 int handler_bci; 398 int current_bci = bci(thread); 399 400 if (thread->frames_to_pop_failed_realloc() > 0) { 401 // Allocation of scalar replaced object used in this frame 402 // failed. Unconditionally pop the frame. 403 thread->dec_frames_to_pop_failed_realloc(); 404 thread->set_vm_result(h_exception()); 405 // If the method is synchronized we already unlocked the monitor 406 // during deoptimization so the interpreter needs to skip it when 407 // the frame is popped. 408 thread->set_do_not_unlock_if_synchronized(true); 409 #ifdef CC_INTERP 410 return (address) -1; 411 #else 412 return Interpreter::remove_activation_entry(); 413 #endif 414 } 415 416 // Need to do this check first since when _do_not_unlock_if_synchronized 417 // is set, we don't want to trigger any classloading which may make calls 418 // into java, or surprisingly find a matching exception handler for bci 0 419 // since at this moment the method hasn't been "officially" entered yet. 420 if (thread->do_not_unlock_if_synchronized()) { 421 ResourceMark rm; 422 assert(current_bci == 0, "bci isn't zero for do_not_unlock_if_synchronized"); 423 thread->set_vm_result(exception); 424 #ifdef CC_INTERP 425 return (address) -1; 426 #else 427 return Interpreter::remove_activation_entry(); 428 #endif 429 } 430 431 do { 432 should_repeat = false; 433 434 // assertions 435 #ifdef ASSERT 436 assert(h_exception.not_null(), "NULL exceptions should be handled by athrow"); 437 assert(h_exception->is_oop(), "just checking"); 438 // Check that exception is a subclass of Throwable, otherwise we have a VerifyError 439 if (!(h_exception->is_a(SystemDictionary::Throwable_klass()))) { 440 if (ExitVMOnVerifyError) vm_exit(-1); 441 ShouldNotReachHere(); 442 } 443 #endif 444 445 // tracing 446 if (log_is_enabled(Info, exceptions)) { 447 ResourceMark rm(thread); 448 stringStream tempst; 449 tempst.print("interpreter method <%s>\n" 450 " at bci %d for thread " INTPTR_FORMAT, 451 h_method->print_value_string(), current_bci, p2i(thread)); 452 Exceptions::log_exception(h_exception, tempst); 453 } 454 // Don't go paging in something which won't be used. 455 // else if (extable->length() == 0) { 456 // // disabled for now - interpreter is not using shortcut yet 457 // // (shortcut is not to call runtime if we have no exception handlers) 458 // // warning("performance bug: should not call runtime if method has no exception handlers"); 459 // } 460 // for AbortVMOnException flag 461 Exceptions::debug_check_abort(h_exception); 462 463 // exception handler lookup 464 KlassHandle h_klass(THREAD, h_exception->klass()); 465 handler_bci = Method::fast_exception_handler_bci_for(h_method, h_klass, current_bci, THREAD); 466 if (HAS_PENDING_EXCEPTION) { 467 // We threw an exception while trying to find the exception handler. 468 // Transfer the new exception to the exception handle which will 469 // be set into thread local storage, and do another lookup for an 470 // exception handler for this exception, this time starting at the 471 // BCI of the exception handler which caused the exception to be 472 // thrown (bug 4307310). 473 h_exception = Handle(THREAD, PENDING_EXCEPTION); 474 CLEAR_PENDING_EXCEPTION; 475 if (handler_bci >= 0) { 476 current_bci = handler_bci; 477 should_repeat = true; 478 } 479 } 480 } while (should_repeat == true); 481 482 #if INCLUDE_JVMCI 483 if (EnableJVMCI && h_method->method_data() != NULL) { 484 ResourceMark rm(thread); 485 ProfileData* pdata = h_method->method_data()->allocate_bci_to_data(current_bci, NULL); 486 if (pdata != NULL && pdata->is_BitData()) { 487 BitData* bit_data = (BitData*) pdata; 488 bit_data->set_exception_seen(); 489 } 490 } 491 #endif 492 493 // notify JVMTI of an exception throw; JVMTI will detect if this is a first 494 // time throw or a stack unwinding throw and accordingly notify the debugger 495 if (JvmtiExport::can_post_on_exceptions()) { 496 JvmtiExport::post_exception_throw(thread, h_method(), bcp(thread), h_exception()); 497 } 498 499 #ifdef CC_INTERP 500 address continuation = (address)(intptr_t) handler_bci; 501 #else 502 address continuation = NULL; 503 #endif 504 address handler_pc = NULL; 505 if (handler_bci < 0 || !thread->reguard_stack((address) &continuation)) { 506 // Forward exception to callee (leaving bci/bcp untouched) because (a) no 507 // handler in this method, or (b) after a stack overflow there is not yet 508 // enough stack space available to reprotect the stack. 509 #ifndef CC_INTERP 510 continuation = Interpreter::remove_activation_entry(); 511 #endif 512 #if COMPILER2_OR_JVMCI 513 // Count this for compilation purposes 514 h_method->interpreter_throwout_increment(THREAD); 515 #endif 516 } else { 517 // handler in this method => change bci/bcp to handler bci/bcp and continue there 518 handler_pc = h_method->code_base() + handler_bci; 519 #ifndef CC_INTERP 520 set_bcp_and_mdp(handler_pc, thread); 521 continuation = Interpreter::dispatch_table(vtos)[*handler_pc]; 522 #endif 523 } 524 // notify debugger of an exception catch 525 // (this is good for exceptions caught in native methods as well) 526 if (JvmtiExport::can_post_on_exceptions()) { 527 JvmtiExport::notice_unwind_due_to_exception(thread, h_method(), handler_pc, h_exception(), (handler_pc != NULL)); 528 } 529 530 thread->set_vm_result(h_exception()); 531 return continuation; 532 IRT_END 533 534 535 IRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* thread)) 536 assert(thread->has_pending_exception(), "must only ne called if there's an exception pending"); 537 // nothing to do - eventually we should remove this code entirely (see comments @ call sites) 538 IRT_END 539 540 541 IRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* thread)) 542 THROW(vmSymbols::java_lang_AbstractMethodError()); 543 IRT_END 544 545 546 IRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* thread)) 547 THROW(vmSymbols::java_lang_IncompatibleClassChangeError()); 548 IRT_END 549 550 551 //------------------------------------------------------------------------------------------------------------------------ 552 // Fields 553 // 554 555 void InterpreterRuntime::resolve_get_put(JavaThread* thread, Bytecodes::Code bytecode) { 556 Thread* THREAD = thread; 557 // resolve field 558 fieldDescriptor info; 559 constantPoolHandle pool(thread, method(thread)->constants()); 560 methodHandle m(thread, method(thread)); 561 bool is_put = (bytecode == Bytecodes::_putfield || bytecode == Bytecodes::_nofast_putfield || 562 bytecode == Bytecodes::_putstatic); 563 bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic); 564 565 { 566 JvmtiHideSingleStepping jhss(thread); 567 LinkResolver::resolve_field_access(info, pool, get_index_u2_cpcache(thread, bytecode), 568 m, bytecode, CHECK); 569 } // end JvmtiHideSingleStepping 570 571 // check if link resolution caused cpCache to be updated 572 ConstantPoolCacheEntry* cp_cache_entry = cache_entry(thread); 573 if (cp_cache_entry->is_resolved(bytecode)) return; 574 575 // compute auxiliary field attributes 576 TosState state = as_TosState(info.field_type()); 577 578 // Resolution of put instructions on final fields is delayed. That is required so that 579 // exceptions are thrown at the correct place (when the instruction is actually invoked). 580 // If we do not resolve an instruction in the current pass, leaving the put_code 581 // set to zero will cause the next put instruction to the same field to reresolve. 582 583 // Resolution of put instructions to final instance fields with invalid updates (i.e., 584 // to final instance fields with updates originating from a method different than <init>) 585 // is inhibited. A putfield instruction targeting an instance final field must throw 586 // an IllegalAccessError if the instruction is not in an instance 587 // initializer method <init>. If resolution were not inhibited, a putfield 588 // in an initializer method could be resolved in the initializer. Subsequent 589 // putfield instructions to the same field would then use cached information. 590 // As a result, those instructions would not pass through the VM. That is, 591 // checks in resolve_field_access() would not be executed for those instructions 592 // and the required IllegalAccessError would not be thrown. 593 // 594 // Also, we need to delay resolving getstatic and putstatic instructions until the 595 // class is initialized. This is required so that access to the static 596 // field will call the initialization function every time until the class 597 // is completely initialized ala. in 2.17.5 in JVM Specification. 598 InstanceKlass* klass = InstanceKlass::cast(info.field_holder()); 599 bool uninitialized_static = is_static && !klass->is_initialized(); 600 bool has_initialized_final_update = info.field_holder()->major_version() >= 53 && 601 info.has_initialized_final_update(); 602 assert(!(has_initialized_final_update && !info.access_flags().is_final()), "Fields with initialized final updates must be final"); 603 604 Bytecodes::Code get_code = (Bytecodes::Code)0; 605 Bytecodes::Code put_code = (Bytecodes::Code)0; 606 if (!uninitialized_static) { 607 get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield); 608 if ((is_put && !has_initialized_final_update) || !info.access_flags().is_final()) { 609 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield); 610 } 611 } 612 613 cp_cache_entry->set_field( 614 get_code, 615 put_code, 616 info.field_holder(), 617 info.index(), 618 info.offset(), 619 state, 620 info.access_flags().is_final(), 621 info.access_flags().is_volatile(), 622 pool->pool_holder() 623 ); 624 } 625 626 627 //------------------------------------------------------------------------------------------------------------------------ 628 // Synchronization 629 // 630 // The interpreter's synchronization code is factored out so that it can 631 // be shared by method invocation and synchronized blocks. 632 //%note synchronization_3 633 634 //%note monitor_1 635 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* thread, BasicObjectLock* elem)) 636 #ifdef ASSERT 637 thread->last_frame().interpreter_frame_verify_monitor(elem); 638 #endif 639 if (PrintBiasedLockingStatistics) { 640 Atomic::inc(BiasedLocking::slow_path_entry_count_addr()); 641 } 642 Handle h_obj(thread, elem->obj()); 643 assert(Universe::heap()->is_in_reserved_or_null(h_obj()), 644 "must be NULL or an object"); 645 if (UseBiasedLocking) { 646 // Retry fast entry if bias is revoked to avoid unnecessary inflation 647 ObjectSynchronizer::fast_enter(h_obj, elem->lock(), true, CHECK); 648 } else { 649 ObjectSynchronizer::slow_enter(h_obj, elem->lock(), CHECK); 650 } 651 assert(Universe::heap()->is_in_reserved_or_null(elem->obj()), 652 "must be NULL or an object"); 653 #ifdef ASSERT 654 thread->last_frame().interpreter_frame_verify_monitor(elem); 655 #endif 656 IRT_END 657 658 659 //%note monitor_1 660 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorexit(JavaThread* thread, BasicObjectLock* elem)) 661 #ifdef ASSERT 662 thread->last_frame().interpreter_frame_verify_monitor(elem); 663 #endif 664 Handle h_obj(thread, elem->obj()); 665 assert(Universe::heap()->is_in_reserved_or_null(h_obj()), 666 "must be NULL or an object"); 667 if (elem == NULL || h_obj()->is_unlocked()) { 668 THROW(vmSymbols::java_lang_IllegalMonitorStateException()); 669 } 670 ObjectSynchronizer::slow_exit(h_obj(), elem->lock(), thread); 671 // Free entry. This must be done here, since a pending exception might be installed on 672 // exit. If it is not cleared, the exception handling code will try to unlock the monitor again. 673 elem->set_obj(NULL); 674 #ifdef ASSERT 675 thread->last_frame().interpreter_frame_verify_monitor(elem); 676 #endif 677 IRT_END 678 679 680 IRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* thread)) 681 THROW(vmSymbols::java_lang_IllegalMonitorStateException()); 682 IRT_END 683 684 685 IRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* thread)) 686 // Returns an illegal exception to install into the current thread. The 687 // pending_exception flag is cleared so normal exception handling does not 688 // trigger. Any current installed exception will be overwritten. This 689 // method will be called during an exception unwind. 690 691 assert(!HAS_PENDING_EXCEPTION, "no pending exception"); 692 Handle exception(thread, thread->vm_result()); 693 assert(exception() != NULL, "vm result should be set"); 694 thread->set_vm_result(NULL); // clear vm result before continuing (may cause memory leaks and assert failures) 695 if (!exception->is_a(SystemDictionary::ThreadDeath_klass())) { 696 exception = get_preinitialized_exception( 697 SystemDictionary::IllegalMonitorStateException_klass(), 698 CATCH); 699 } 700 thread->set_vm_result(exception()); 701 IRT_END 702 703 704 //------------------------------------------------------------------------------------------------------------------------ 705 // Invokes 706 707 IRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* thread, Method* method, address bcp)) 708 return method->orig_bytecode_at(method->bci_from(bcp)); 709 IRT_END 710 711 IRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* thread, Method* method, address bcp, Bytecodes::Code new_code)) 712 method->set_orig_bytecode_at(method->bci_from(bcp), new_code); 713 IRT_END 714 715 IRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* thread, Method* method, address bcp)) 716 JvmtiExport::post_raw_breakpoint(thread, method, bcp); 717 IRT_END 718 719 void InterpreterRuntime::resolve_invoke(JavaThread* thread, Bytecodes::Code bytecode) { 720 Thread* THREAD = thread; 721 // extract receiver from the outgoing argument list if necessary 722 Handle receiver(thread, NULL); 723 if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface) { 724 ResourceMark rm(thread); 725 methodHandle m (thread, method(thread)); 726 Bytecode_invoke call(m, bci(thread)); 727 Symbol* signature = call.signature(); 728 receiver = Handle(thread, 729 thread->last_frame().interpreter_callee_receiver(signature)); 730 assert(Universe::heap()->is_in_reserved_or_null(receiver()), 731 "sanity check"); 732 assert(receiver.is_null() || 733 !Universe::heap()->is_in_reserved(receiver->klass()), 734 "sanity check"); 735 } 736 737 // resolve method 738 CallInfo info; 739 constantPoolHandle pool(thread, method(thread)->constants()); 740 741 { 742 JvmtiHideSingleStepping jhss(thread); 743 LinkResolver::resolve_invoke(info, receiver, pool, 744 get_index_u2_cpcache(thread, bytecode), bytecode, 745 CHECK); 746 if (JvmtiExport::can_hotswap_or_post_breakpoint()) { 747 int retry_count = 0; 748 while (info.resolved_method()->is_old()) { 749 // It is very unlikely that method is redefined more than 100 times 750 // in the middle of resolve. If it is looping here more than 100 times 751 // means then there could be a bug here. 752 guarantee((retry_count++ < 100), 753 "Could not resolve to latest version of redefined method"); 754 // method is redefined in the middle of resolve so re-try. 755 LinkResolver::resolve_invoke(info, receiver, pool, 756 get_index_u2_cpcache(thread, bytecode), bytecode, 757 CHECK); 758 } 759 } 760 } // end JvmtiHideSingleStepping 761 762 // check if link resolution caused cpCache to be updated 763 ConstantPoolCacheEntry* cp_cache_entry = cache_entry(thread); 764 if (cp_cache_entry->is_resolved(bytecode)) return; 765 766 #ifdef ASSERT 767 if (bytecode == Bytecodes::_invokeinterface) { 768 if (info.resolved_method()->method_holder() == 769 SystemDictionary::Object_klass()) { 770 // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec 771 // (see also CallInfo::set_interface for details) 772 assert(info.call_kind() == CallInfo::vtable_call || 773 info.call_kind() == CallInfo::direct_call, ""); 774 methodHandle rm = info.resolved_method(); 775 assert(rm->is_final() || info.has_vtable_index(), 776 "should have been set already"); 777 } else if (!info.resolved_method()->has_itable_index()) { 778 // Resolved something like CharSequence.toString. Use vtable not itable. 779 assert(info.call_kind() != CallInfo::itable_call, ""); 780 } else { 781 // Setup itable entry 782 assert(info.call_kind() == CallInfo::itable_call, ""); 783 int index = info.resolved_method()->itable_index(); 784 assert(info.itable_index() == index, ""); 785 } 786 } else { 787 assert(info.call_kind() == CallInfo::direct_call || 788 info.call_kind() == CallInfo::vtable_call, ""); 789 } 790 #endif 791 switch (info.call_kind()) { 792 case CallInfo::direct_call: 793 cp_cache_entry->set_direct_call( 794 bytecode, 795 info.resolved_method()); 796 break; 797 case CallInfo::vtable_call: 798 cp_cache_entry->set_vtable_call( 799 bytecode, 800 info.resolved_method(), 801 info.vtable_index()); 802 break; 803 case CallInfo::itable_call: 804 cp_cache_entry->set_itable_call( 805 bytecode, 806 info.resolved_method(), 807 info.itable_index()); 808 break; 809 default: ShouldNotReachHere(); 810 } 811 } 812 813 814 // First time execution: Resolve symbols, create a permanent MethodType object. 815 void InterpreterRuntime::resolve_invokehandle(JavaThread* thread) { 816 Thread* THREAD = thread; 817 const Bytecodes::Code bytecode = Bytecodes::_invokehandle; 818 819 // resolve method 820 CallInfo info; 821 constantPoolHandle pool(thread, method(thread)->constants()); 822 { 823 JvmtiHideSingleStepping jhss(thread); 824 LinkResolver::resolve_invoke(info, Handle(), pool, 825 get_index_u2_cpcache(thread, bytecode), bytecode, 826 CHECK); 827 } // end JvmtiHideSingleStepping 828 829 ConstantPoolCacheEntry* cp_cache_entry = cache_entry(thread); 830 cp_cache_entry->set_method_handle(pool, info); 831 } 832 833 // First time execution: Resolve symbols, create a permanent CallSite object. 834 void InterpreterRuntime::resolve_invokedynamic(JavaThread* thread) { 835 Thread* THREAD = thread; 836 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic; 837 838 //TO DO: consider passing BCI to Java. 839 // int caller_bci = method(thread)->bci_from(bcp(thread)); 840 841 // resolve method 842 CallInfo info; 843 constantPoolHandle pool(thread, method(thread)->constants()); 844 int index = get_index_u4(thread, bytecode); 845 { 846 JvmtiHideSingleStepping jhss(thread); 847 LinkResolver::resolve_invoke(info, Handle(), pool, 848 index, bytecode, CHECK); 849 } // end JvmtiHideSingleStepping 850 851 ConstantPoolCacheEntry* cp_cache_entry = pool->invokedynamic_cp_cache_entry_at(index); 852 cp_cache_entry->set_dynamic_call(pool, info); 853 } 854 855 // This function is the interface to the assembly code. It returns the resolved 856 // cpCache entry. This doesn't safepoint, but the helper routines safepoint. 857 // This function will check for redefinition! 858 IRT_ENTRY(void, InterpreterRuntime::resolve_from_cache(JavaThread* thread, Bytecodes::Code bytecode)) { 859 switch (bytecode) { 860 case Bytecodes::_getstatic: 861 case Bytecodes::_putstatic: 862 case Bytecodes::_getfield: 863 case Bytecodes::_putfield: 864 resolve_get_put(thread, bytecode); 865 break; 866 case Bytecodes::_invokevirtual: 867 case Bytecodes::_invokespecial: 868 case Bytecodes::_invokestatic: 869 case Bytecodes::_invokeinterface: 870 resolve_invoke(thread, bytecode); 871 break; 872 case Bytecodes::_invokehandle: 873 resolve_invokehandle(thread); 874 break; 875 case Bytecodes::_invokedynamic: 876 resolve_invokedynamic(thread); 877 break; 878 default: 879 fatal("unexpected bytecode: %s", Bytecodes::name(bytecode)); 880 break; 881 } 882 } 883 IRT_END 884 885 //------------------------------------------------------------------------------------------------------------------------ 886 // Miscellaneous 887 888 889 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* thread, address branch_bcp) { 890 nmethod* nm = frequency_counter_overflow_inner(thread, branch_bcp); 891 assert(branch_bcp != NULL || nm == NULL, "always returns null for non OSR requests"); 892 if (branch_bcp != NULL && nm != NULL) { 893 // This was a successful request for an OSR nmethod. Because 894 // frequency_counter_overflow_inner ends with a safepoint check, 895 // nm could have been unloaded so look it up again. It's unsafe 896 // to examine nm directly since it might have been freed and used 897 // for something else. 898 frame fr = thread->last_frame(); 899 Method* method = fr.interpreter_frame_method(); 900 int bci = method->bci_from(fr.interpreter_frame_bcp()); 901 nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false); 902 } 903 #ifndef PRODUCT 904 if (TraceOnStackReplacement) { 905 if (nm != NULL) { 906 tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", p2i(nm->osr_entry())); 907 nm->print(); 908 } 909 } 910 #endif 911 return nm; 912 } 913 914 IRT_ENTRY(nmethod*, 915 InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* thread, address branch_bcp)) 916 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized 917 // flag, in case this method triggers classloading which will call into Java. 918 UnlockFlagSaver fs(thread); 919 920 frame fr = thread->last_frame(); 921 assert(fr.is_interpreted_frame(), "must come from interpreter"); 922 methodHandle method(thread, fr.interpreter_frame_method()); 923 const int branch_bci = branch_bcp != NULL ? method->bci_from(branch_bcp) : InvocationEntryBci; 924 const int bci = branch_bcp != NULL ? method->bci_from(fr.interpreter_frame_bcp()) : InvocationEntryBci; 925 926 assert(!HAS_PENDING_EXCEPTION, "Should not have any exceptions pending"); 927 nmethod* osr_nm = CompilationPolicy::policy()->event(method, method, branch_bci, bci, CompLevel_none, NULL, thread); 928 assert(!HAS_PENDING_EXCEPTION, "Event handler should not throw any exceptions"); 929 930 if (osr_nm != NULL) { 931 // We may need to do on-stack replacement which requires that no 932 // monitors in the activation are biased because their 933 // BasicObjectLocks will need to migrate during OSR. Force 934 // unbiasing of all monitors in the activation now (even though 935 // the OSR nmethod might be invalidated) because we don't have a 936 // safepoint opportunity later once the migration begins. 937 if (UseBiasedLocking) { 938 ResourceMark rm; 939 GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>(); 940 for( BasicObjectLock *kptr = fr.interpreter_frame_monitor_end(); 941 kptr < fr.interpreter_frame_monitor_begin(); 942 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) { 943 if( kptr->obj() != NULL ) { 944 objects_to_revoke->append(Handle(THREAD, kptr->obj())); 945 } 946 } 947 BiasedLocking::revoke(objects_to_revoke); 948 } 949 } 950 return osr_nm; 951 IRT_END 952 953 IRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp)) 954 assert(ProfileInterpreter, "must be profiling interpreter"); 955 int bci = method->bci_from(cur_bcp); 956 MethodData* mdo = method->method_data(); 957 if (mdo == NULL) return 0; 958 return mdo->bci_to_di(bci); 959 IRT_END 960 961 IRT_ENTRY(void, InterpreterRuntime::profile_method(JavaThread* thread)) 962 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized 963 // flag, in case this method triggers classloading which will call into Java. 964 UnlockFlagSaver fs(thread); 965 966 assert(ProfileInterpreter, "must be profiling interpreter"); 967 frame fr = thread->last_frame(); 968 assert(fr.is_interpreted_frame(), "must come from interpreter"); 969 methodHandle method(thread, fr.interpreter_frame_method()); 970 Method::build_interpreter_method_data(method, THREAD); 971 if (HAS_PENDING_EXCEPTION) { 972 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here"); 973 CLEAR_PENDING_EXCEPTION; 974 // and fall through... 975 } 976 IRT_END 977 978 979 #ifdef ASSERT 980 IRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp)) 981 assert(ProfileInterpreter, "must be profiling interpreter"); 982 983 MethodData* mdo = method->method_data(); 984 assert(mdo != NULL, "must not be null"); 985 986 int bci = method->bci_from(bcp); 987 988 address mdp2 = mdo->bci_to_dp(bci); 989 if (mdp != mdp2) { 990 ResourceMark rm; 991 ResetNoHandleMark rnm; // In a LEAF entry. 992 HandleMark hm; 993 tty->print_cr("FAILED verify : actual mdp %p expected mdp %p @ bci %d", mdp, mdp2, bci); 994 int current_di = mdo->dp_to_di(mdp); 995 int expected_di = mdo->dp_to_di(mdp2); 996 tty->print_cr(" actual di %d expected di %d", current_di, expected_di); 997 int expected_approx_bci = mdo->data_at(expected_di)->bci(); 998 int approx_bci = -1; 999 if (current_di >= 0) { 1000 approx_bci = mdo->data_at(current_di)->bci(); 1001 } 1002 tty->print_cr(" actual bci is %d expected bci %d", approx_bci, expected_approx_bci); 1003 mdo->print_on(tty); 1004 method->print_codes(); 1005 } 1006 assert(mdp == mdp2, "wrong mdp"); 1007 IRT_END 1008 #endif // ASSERT 1009 1010 IRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* thread, int return_bci)) 1011 assert(ProfileInterpreter, "must be profiling interpreter"); 1012 ResourceMark rm(thread); 1013 HandleMark hm(thread); 1014 frame fr = thread->last_frame(); 1015 assert(fr.is_interpreted_frame(), "must come from interpreter"); 1016 MethodData* h_mdo = fr.interpreter_frame_method()->method_data(); 1017 1018 // Grab a lock to ensure atomic access to setting the return bci and 1019 // the displacement. This can block and GC, invalidating all naked oops. 1020 MutexLocker ml(RetData_lock); 1021 1022 // ProfileData is essentially a wrapper around a derived oop, so we 1023 // need to take the lock before making any ProfileData structures. 1024 ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(fr.interpreter_frame_mdp())); 1025 RetData* rdata = data->as_RetData(); 1026 address new_mdp = rdata->fixup_ret(return_bci, h_mdo); 1027 fr.interpreter_frame_set_mdp(new_mdp); 1028 IRT_END 1029 1030 IRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* thread, Method* m)) 1031 MethodCounters* mcs = Method::build_method_counters(m, thread); 1032 if (HAS_PENDING_EXCEPTION) { 1033 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here"); 1034 CLEAR_PENDING_EXCEPTION; 1035 } 1036 return mcs; 1037 IRT_END 1038 1039 1040 IRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* thread)) 1041 // We used to need an explict preserve_arguments here for invoke bytecodes. However, 1042 // stack traversal automatically takes care of preserving arguments for invoke, so 1043 // this is no longer needed. 1044 1045 // IRT_END does an implicit safepoint check, hence we are guaranteed to block 1046 // if this is called during a safepoint 1047 1048 if (JvmtiExport::should_post_single_step()) { 1049 // We are called during regular safepoints and when the VM is 1050 // single stepping. If any thread is marked for single stepping, 1051 // then we may have JVMTI work to do. 1052 JvmtiExport::at_single_stepping_point(thread, method(thread), bcp(thread)); 1053 } 1054 IRT_END 1055 1056 IRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread *thread, oopDesc* obj, 1057 ConstantPoolCacheEntry *cp_entry)) 1058 1059 // check the access_flags for the field in the klass 1060 1061 InstanceKlass* ik = InstanceKlass::cast(cp_entry->f1_as_klass()); 1062 int index = cp_entry->field_index(); 1063 if ((ik->field_access_flags(index) & JVM_ACC_FIELD_ACCESS_WATCHED) == 0) return; 1064 1065 bool is_static = (obj == NULL); 1066 HandleMark hm(thread); 1067 1068 Handle h_obj; 1069 if (!is_static) { 1070 // non-static field accessors have an object, but we need a handle 1071 h_obj = Handle(thread, obj); 1072 } 1073 instanceKlassHandle h_cp_entry_f1(thread, (Klass*)cp_entry->f1_as_klass()); 1074 jfieldID fid = jfieldIDWorkaround::to_jfieldID(h_cp_entry_f1, cp_entry->f2_as_index(), is_static); 1075 JvmtiExport::post_field_access(thread, method(thread), bcp(thread), h_cp_entry_f1, h_obj, fid); 1076 IRT_END 1077 1078 IRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread *thread, 1079 oopDesc* obj, ConstantPoolCacheEntry *cp_entry, jvalue *value)) 1080 1081 Klass* k = (Klass*)cp_entry->f1_as_klass(); 1082 1083 // check the access_flags for the field in the klass 1084 InstanceKlass* ik = InstanceKlass::cast(k); 1085 int index = cp_entry->field_index(); 1086 // bail out if field modifications are not watched 1087 if ((ik->field_access_flags(index) & JVM_ACC_FIELD_MODIFICATION_WATCHED) == 0) return; 1088 1089 char sig_type = '\0'; 1090 1091 switch(cp_entry->flag_state()) { 1092 case btos: sig_type = 'B'; break; 1093 case ztos: sig_type = 'Z'; break; 1094 case ctos: sig_type = 'C'; break; 1095 case stos: sig_type = 'S'; break; 1096 case itos: sig_type = 'I'; break; 1097 case ftos: sig_type = 'F'; break; 1098 case atos: sig_type = 'L'; break; 1099 case ltos: sig_type = 'J'; break; 1100 case dtos: sig_type = 'D'; break; 1101 default: ShouldNotReachHere(); return; 1102 } 1103 bool is_static = (obj == NULL); 1104 1105 HandleMark hm(thread); 1106 instanceKlassHandle h_klass(thread, k); 1107 jfieldID fid = jfieldIDWorkaround::to_jfieldID(h_klass, cp_entry->f2_as_index(), is_static); 1108 jvalue fvalue; 1109 #ifdef _LP64 1110 fvalue = *value; 1111 #else 1112 // Long/double values are stored unaligned and also noncontiguously with 1113 // tagged stacks. We can't just do a simple assignment even in the non- 1114 // J/D cases because a C++ compiler is allowed to assume that a jvalue is 1115 // 8-byte aligned, and interpreter stack slots are only 4-byte aligned. 1116 // We assume that the two halves of longs/doubles are stored in interpreter 1117 // stack slots in platform-endian order. 1118 jlong_accessor u; 1119 jint* newval = (jint*)value; 1120 u.words[0] = newval[0]; 1121 u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag 1122 fvalue.j = u.long_value; 1123 #endif // _LP64 1124 1125 Handle h_obj; 1126 if (!is_static) { 1127 // non-static field accessors have an object, but we need a handle 1128 h_obj = Handle(thread, obj); 1129 } 1130 1131 JvmtiExport::post_raw_field_modification(thread, method(thread), bcp(thread), h_klass, h_obj, 1132 fid, sig_type, &fvalue); 1133 IRT_END 1134 1135 IRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread *thread)) 1136 JvmtiExport::post_method_entry(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread)); 1137 IRT_END 1138 1139 1140 IRT_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread *thread)) 1141 JvmtiExport::post_method_exit(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread)); 1142 IRT_END 1143 1144 IRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc)) 1145 { 1146 return (Interpreter::contains(pc) ? 1 : 0); 1147 } 1148 IRT_END 1149 1150 1151 // Implementation of SignatureHandlerLibrary 1152 1153 #ifndef SHARING_FAST_NATIVE_FINGERPRINTS 1154 // Dummy definition (else normalization method is defined in CPU 1155 // dependant code) 1156 uint64_t InterpreterRuntime::normalize_fast_native_fingerprint(uint64_t fingerprint) { 1157 return fingerprint; 1158 } 1159 #endif 1160 1161 address SignatureHandlerLibrary::set_handler_blob() { 1162 BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size); 1163 if (handler_blob == NULL) { 1164 return NULL; 1165 } 1166 address handler = handler_blob->code_begin(); 1167 _handler_blob = handler_blob; 1168 _handler = handler; 1169 return handler; 1170 } 1171 1172 void SignatureHandlerLibrary::initialize() { 1173 if (_fingerprints != NULL) { 1174 return; 1175 } 1176 if (set_handler_blob() == NULL) { 1177 vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers"); 1178 } 1179 1180 BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer", 1181 SignatureHandlerLibrary::buffer_size); 1182 _buffer = bb->code_begin(); 1183 1184 _fingerprints = new(ResourceObj::C_HEAP, mtCode)GrowableArray<uint64_t>(32, true); 1185 _handlers = new(ResourceObj::C_HEAP, mtCode)GrowableArray<address>(32, true); 1186 } 1187 1188 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) { 1189 address handler = _handler; 1190 int insts_size = buffer->pure_insts_size(); 1191 if (handler + insts_size > _handler_blob->code_end()) { 1192 // get a new handler blob 1193 handler = set_handler_blob(); 1194 } 1195 if (handler != NULL) { 1196 memcpy(handler, buffer->insts_begin(), insts_size); 1197 pd_set_handler(handler); 1198 ICache::invalidate_range(handler, insts_size); 1199 _handler = handler + insts_size; 1200 } 1201 return handler; 1202 } 1203 1204 void SignatureHandlerLibrary::add(const methodHandle& method) { 1205 if (method->signature_handler() == NULL) { 1206 // use slow signature handler if we can't do better 1207 int handler_index = -1; 1208 // check if we can use customized (fast) signature handler 1209 if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::max_size_of_parameters) { 1210 // use customized signature handler 1211 MutexLocker mu(SignatureHandlerLibrary_lock); 1212 // make sure data structure is initialized 1213 initialize(); 1214 // lookup method signature's fingerprint 1215 uint64_t fingerprint = Fingerprinter(method).fingerprint(); 1216 // allow CPU dependant code to optimize the fingerprints for the fast handler 1217 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint); 1218 handler_index = _fingerprints->find(fingerprint); 1219 // create handler if necessary 1220 if (handler_index < 0) { 1221 ResourceMark rm; 1222 ptrdiff_t align_offset = (address) 1223 round_to((intptr_t)_buffer, CodeEntryAlignment) - (address)_buffer; 1224 CodeBuffer buffer((address)(_buffer + align_offset), 1225 SignatureHandlerLibrary::buffer_size - align_offset); 1226 InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint); 1227 // copy into code heap 1228 address handler = set_handler(&buffer); 1229 if (handler == NULL) { 1230 // use slow signature handler (without memorizing it in the fingerprints) 1231 } else { 1232 // debugging suppport 1233 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) { 1234 ttyLocker ttyl; 1235 tty->cr(); 1236 tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)", 1237 _handlers->length(), 1238 (method->is_static() ? "static" : "receiver"), 1239 method->name_and_sig_as_C_string(), 1240 fingerprint, 1241 buffer.insts_size()); 1242 if (buffer.insts_size() > 0) { 1243 Disassembler::decode(handler, handler + buffer.insts_size()); 1244 } 1245 #ifndef PRODUCT 1246 address rh_begin = Interpreter::result_handler(method()->result_type()); 1247 if (CodeCache::contains(rh_begin)) { 1248 // else it might be special platform dependent values 1249 tty->print_cr(" --- associated result handler ---"); 1250 address rh_end = rh_begin; 1251 while (*(int*)rh_end != 0) { 1252 rh_end += sizeof(int); 1253 } 1254 Disassembler::decode(rh_begin, rh_end); 1255 } else { 1256 tty->print_cr(" associated result handler: " PTR_FORMAT, p2i(rh_begin)); 1257 } 1258 #endif 1259 } 1260 // add handler to library 1261 _fingerprints->append(fingerprint); 1262 _handlers->append(handler); 1263 // set handler index 1264 assert(_fingerprints->length() == _handlers->length(), "sanity check"); 1265 handler_index = _fingerprints->length() - 1; 1266 } 1267 } 1268 // Set handler under SignatureHandlerLibrary_lock 1269 if (handler_index < 0) { 1270 // use generic signature handler 1271 method->set_signature_handler(Interpreter::slow_signature_handler()); 1272 } else { 1273 // set handler 1274 method->set_signature_handler(_handlers->at(handler_index)); 1275 } 1276 } else { 1277 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 1278 // use generic signature handler 1279 method->set_signature_handler(Interpreter::slow_signature_handler()); 1280 } 1281 } 1282 #ifdef ASSERT 1283 int handler_index = -1; 1284 int fingerprint_index = -2; 1285 { 1286 // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized 1287 // in any way if accessed from multiple threads. To avoid races with another 1288 // thread which may change the arrays in the above, mutex protected block, we 1289 // have to protect this read access here with the same mutex as well! 1290 MutexLocker mu(SignatureHandlerLibrary_lock); 1291 if (_handlers != NULL) { 1292 handler_index = _handlers->find(method->signature_handler()); 1293 uint64_t fingerprint = Fingerprinter(method).fingerprint(); 1294 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint); 1295 fingerprint_index = _fingerprints->find(fingerprint); 1296 } 1297 } 1298 assert(method->signature_handler() == Interpreter::slow_signature_handler() || 1299 handler_index == fingerprint_index, "sanity check"); 1300 #endif // ASSERT 1301 } 1302 1303 void SignatureHandlerLibrary::add(uint64_t fingerprint, address handler) { 1304 int handler_index = -1; 1305 // use customized signature handler 1306 MutexLocker mu(SignatureHandlerLibrary_lock); 1307 // make sure data structure is initialized 1308 initialize(); 1309 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint); 1310 handler_index = _fingerprints->find(fingerprint); 1311 // create handler if necessary 1312 if (handler_index < 0) { 1313 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) { 1314 tty->cr(); 1315 tty->print_cr("argument handler #%d at " PTR_FORMAT " for fingerprint " UINT64_FORMAT, 1316 _handlers->length(), 1317 p2i(handler), 1318 fingerprint); 1319 } 1320 _fingerprints->append(fingerprint); 1321 _handlers->append(handler); 1322 } else { 1323 if (PrintSignatureHandlers) { 1324 tty->cr(); 1325 tty->print_cr("duplicate argument handler #%d for fingerprint " UINT64_FORMAT "(old: " PTR_FORMAT ", new : " PTR_FORMAT ")", 1326 _handlers->length(), 1327 fingerprint, 1328 p2i(_handlers->at(handler_index)), 1329 p2i(handler)); 1330 } 1331 } 1332 } 1333 1334 1335 BufferBlob* SignatureHandlerLibrary::_handler_blob = NULL; 1336 address SignatureHandlerLibrary::_handler = NULL; 1337 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = NULL; 1338 GrowableArray<address>* SignatureHandlerLibrary::_handlers = NULL; 1339 address SignatureHandlerLibrary::_buffer = NULL; 1340 1341 1342 IRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* thread, Method* method)) 1343 methodHandle m(thread, method); 1344 assert(m->is_native(), "sanity check"); 1345 // lookup native function entry point if it doesn't exist 1346 bool in_base_library; 1347 if (!m->has_native_function()) { 1348 NativeLookup::lookup(m, in_base_library, CHECK); 1349 } 1350 // make sure signature handler is installed 1351 SignatureHandlerLibrary::add(m); 1352 // The interpreter entry point checks the signature handler first, 1353 // before trying to fetch the native entry point and klass mirror. 1354 // We must set the signature handler last, so that multiple processors 1355 // preparing the same method will be sure to see non-null entry & mirror. 1356 IRT_END 1357 1358 #if defined(IA32) || defined(AMD64) || defined(ARM) 1359 IRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* thread, void* src_address, void* dest_address)) 1360 if (src_address == dest_address) { 1361 return; 1362 } 1363 ResetNoHandleMark rnm; // In a LEAF entry. 1364 HandleMark hm; 1365 ResourceMark rm; 1366 frame fr = thread->last_frame(); 1367 assert(fr.is_interpreted_frame(), ""); 1368 jint bci = fr.interpreter_frame_bci(); 1369 methodHandle mh(thread, fr.interpreter_frame_method()); 1370 Bytecode_invoke invoke(mh, bci); 1371 ArgumentSizeComputer asc(invoke.signature()); 1372 int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver 1373 Copy::conjoint_jbytes(src_address, dest_address, 1374 size_of_arguments * Interpreter::stackElementSize); 1375 IRT_END 1376 #endif 1377 1378 #if INCLUDE_JVMTI 1379 // This is a support of the JVMTI PopFrame interface. 1380 // Make sure it is an invokestatic of a polymorphic intrinsic that has a member_name argument 1381 // and return it as a vm_result so that it can be reloaded in the list of invokestatic parameters. 1382 // The member_name argument is a saved reference (in local#0) to the member_name. 1383 // For backward compatibility with some JDK versions (7, 8) it can also be a direct method handle. 1384 // FIXME: remove DMH case after j.l.i.InvokerBytecodeGenerator code shape is updated. 1385 IRT_ENTRY(void, InterpreterRuntime::member_name_arg_or_null(JavaThread* thread, address member_name, 1386 Method* method, address bcp)) 1387 Bytecodes::Code code = Bytecodes::code_at(method, bcp); 1388 if (code != Bytecodes::_invokestatic) { 1389 return; 1390 } 1391 ConstantPool* cpool = method->constants(); 1392 int cp_index = Bytes::get_native_u2(bcp + 1) + ConstantPool::CPCACHE_INDEX_TAG; 1393 Symbol* cname = cpool->klass_name_at(cpool->klass_ref_index_at(cp_index)); 1394 Symbol* mname = cpool->name_ref_at(cp_index); 1395 1396 if (MethodHandles::has_member_arg(cname, mname)) { 1397 oop member_name_oop = (oop) member_name; 1398 if (java_lang_invoke_DirectMethodHandle::is_instance(member_name_oop)) { 1399 // FIXME: remove after j.l.i.InvokerBytecodeGenerator code shape is updated. 1400 member_name_oop = java_lang_invoke_DirectMethodHandle::member(member_name_oop); 1401 } 1402 thread->set_vm_result(member_name_oop); 1403 } else { 1404 thread->set_vm_result(NULL); 1405 } 1406 IRT_END 1407 #endif // INCLUDE_JVMTI 1408 1409 #ifndef PRODUCT 1410 // This must be a IRT_LEAF function because the interpreter must save registers on x86 to 1411 // call this, which changes rsp and makes the interpreter's expression stack not walkable. 1412 // The generated code still uses call_VM because that will set up the frame pointer for 1413 // bcp and method. 1414 IRT_LEAF(intptr_t, InterpreterRuntime::trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2)) 1415 const frame f = thread->last_frame(); 1416 assert(f.is_interpreted_frame(), "must be an interpreted frame"); 1417 methodHandle mh(thread, f.interpreter_frame_method()); 1418 BytecodeTracer::trace(mh, f.interpreter_frame_bcp(), tos, tos2); 1419 return preserve_this_value; 1420 IRT_END 1421 #endif // !PRODUCT