1 /* 2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25 #include "incls/_precompiled.incl" 26 #include "incls/_interpreterRuntime.cpp.incl" 27 28 class UnlockFlagSaver { 29 private: 30 JavaThread* _thread; 31 bool _do_not_unlock; 32 public: 33 UnlockFlagSaver(JavaThread* t) { 34 _thread = t; 35 _do_not_unlock = t->do_not_unlock_if_synchronized(); 36 t->set_do_not_unlock_if_synchronized(false); 37 } 38 ~UnlockFlagSaver() { 39 _thread->set_do_not_unlock_if_synchronized(_do_not_unlock); 40 } 41 }; 42 43 //------------------------------------------------------------------------------------------------------------------------ 44 // State accessors 45 46 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread *thread) { 47 last_frame(thread).interpreter_frame_set_bcp(bcp); 48 if (ProfileInterpreter) { 49 // ProfileTraps uses MDOs independently of ProfileInterpreter. 50 // That is why we must check both ProfileInterpreter and mdo != NULL. 51 methodDataOop mdo = last_frame(thread).interpreter_frame_method()->method_data(); 52 if (mdo != NULL) { 53 NEEDS_CLEANUP; 54 last_frame(thread).interpreter_frame_set_mdp(mdo->bci_to_dp(last_frame(thread).interpreter_frame_bci())); 55 } 56 } 57 } 58 59 //------------------------------------------------------------------------------------------------------------------------ 60 // Constants 61 62 63 IRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* thread, bool wide)) 64 // access constant pool 65 constantPoolOop pool = method(thread)->constants(); 66 int index = wide ? two_byte_index(thread) : one_byte_index(thread); 67 constantTag tag = pool->tag_at(index); 68 69 if (tag.is_unresolved_klass() || tag.is_klass()) { 70 klassOop klass = pool->klass_at(index, CHECK); 71 oop java_class = klass->klass_part()->java_mirror(); 72 thread->set_vm_result(java_class); 73 } else { 74 #ifdef ASSERT 75 // If we entered this runtime routine, we believed the tag contained 76 // an unresolved string, an unresolved class or a resolved class. 77 // However, another thread could have resolved the unresolved string 78 // or class by the time we go there. 79 assert(tag.is_unresolved_string()|| tag.is_string(), "expected string"); 80 #endif 81 oop s_oop = pool->string_at(index, CHECK); 82 thread->set_vm_result(s_oop); 83 } 84 IRT_END 85 86 87 //------------------------------------------------------------------------------------------------------------------------ 88 // Allocation 89 90 IRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* thread, constantPoolOopDesc* pool, int index)) 91 klassOop k_oop = pool->klass_at(index, CHECK); 92 instanceKlassHandle klass (THREAD, k_oop); 93 94 // Make sure we are not instantiating an abstract klass 95 klass->check_valid_for_instantiation(true, CHECK); 96 97 // Make sure klass is initialized 98 klass->initialize(CHECK); 99 100 // At this point the class may not be fully initialized 101 // because of recursive initialization. If it is fully 102 // initialized & has_finalized is not set, we rewrite 103 // it into its fast version (Note: no locking is needed 104 // here since this is an atomic byte write and can be 105 // done more than once). 106 // 107 // Note: In case of classes with has_finalized we don't 108 // rewrite since that saves us an extra check in 109 // the fast version which then would call the 110 // slow version anyway (and do a call back into 111 // Java). 112 // If we have a breakpoint, then we don't rewrite 113 // because the _breakpoint bytecode would be lost. 114 oop obj = klass->allocate_instance(CHECK); 115 thread->set_vm_result(obj); 116 IRT_END 117 118 119 IRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* thread, BasicType type, jint size)) 120 oop obj = oopFactory::new_typeArray(type, size, CHECK); 121 thread->set_vm_result(obj); 122 IRT_END 123 124 125 IRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* thread, constantPoolOopDesc* pool, int index, jint size)) 126 // Note: no oopHandle for pool & klass needed since they are not used 127 // anymore after new_objArray() and no GC can happen before. 128 // (This may have to change if this code changes!) 129 klassOop klass = pool->klass_at(index, CHECK); 130 objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK); 131 thread->set_vm_result(obj); 132 IRT_END 133 134 135 IRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* thread, jint* first_size_address)) 136 // We may want to pass in more arguments - could make this slightly faster 137 constantPoolOop constants = method(thread)->constants(); 138 int i = two_byte_index(thread); 139 klassOop klass = constants->klass_at(i, CHECK); 140 int nof_dims = number_of_dimensions(thread); 141 assert(oop(klass)->is_klass(), "not a class"); 142 assert(nof_dims >= 1, "multianewarray rank must be nonzero"); 143 144 // We must create an array of jints to pass to multi_allocate. 145 ResourceMark rm(thread); 146 const int small_dims = 10; 147 jint dim_array[small_dims]; 148 jint *dims = &dim_array[0]; 149 if (nof_dims > small_dims) { 150 dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims); 151 } 152 for (int index = 0; index < nof_dims; index++) { 153 // offset from first_size_address is addressed as local[index] 154 int n = Interpreter::local_offset_in_bytes(index)/jintSize; 155 dims[index] = first_size_address[n]; 156 } 157 oop obj = arrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK); 158 thread->set_vm_result(obj); 159 IRT_END 160 161 162 IRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* thread, oopDesc* obj)) 163 assert(obj->is_oop(), "must be a valid oop"); 164 assert(obj->klass()->klass_part()->has_finalizer(), "shouldn't be here otherwise"); 165 instanceKlass::register_finalizer(instanceOop(obj), CHECK); 166 IRT_END 167 168 169 // Quicken instance-of and check-cast bytecodes 170 IRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* thread)) 171 // Force resolving; quicken the bytecode 172 int which = two_byte_index(thread); 173 constantPoolOop cpool = method(thread)->constants(); 174 // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded 175 // program we might have seen an unquick'd bytecode in the interpreter but have another 176 // thread quicken the bytecode before we get here. 177 // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" ); 178 klassOop klass = cpool->klass_at(which, CHECK); 179 thread->set_vm_result(klass); 180 IRT_END 181 182 183 //------------------------------------------------------------------------------------------------------------------------ 184 // Exceptions 185 186 // Assume the compiler is (or will be) interested in this event. 187 // If necessary, create an MDO to hold the information, and record it. 188 void InterpreterRuntime::note_trap(JavaThread* thread, int reason, TRAPS) { 189 assert(ProfileTraps, "call me only if profiling"); 190 methodHandle trap_method(thread, method(thread)); 191 if (trap_method.not_null()) { 192 methodDataHandle trap_mdo(thread, trap_method->method_data()); 193 if (trap_mdo.is_null()) { 194 methodOopDesc::build_interpreter_method_data(trap_method, THREAD); 195 if (HAS_PENDING_EXCEPTION) { 196 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here"); 197 CLEAR_PENDING_EXCEPTION; 198 } 199 trap_mdo = methodDataHandle(thread, trap_method->method_data()); 200 // and fall through... 201 } 202 if (trap_mdo.not_null()) { 203 // Update per-method count of trap events. The interpreter 204 // is updating the MDO to simulate the effect of compiler traps. 205 int trap_bci = trap_method->bci_from(bcp(thread)); 206 Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason); 207 } 208 } 209 } 210 211 static Handle get_preinitialized_exception(klassOop k, TRAPS) { 212 // get klass 213 instanceKlass* klass = instanceKlass::cast(k); 214 assert(klass->is_initialized(), 215 "this klass should have been initialized during VM initialization"); 216 // create instance - do not call constructor since we may have no 217 // (java) stack space left (should assert constructor is empty) 218 Handle exception; 219 oop exception_oop = klass->allocate_instance(CHECK_(exception)); 220 exception = Handle(THREAD, exception_oop); 221 if (StackTraceInThrowable) { 222 java_lang_Throwable::fill_in_stack_trace(exception); 223 } 224 return exception; 225 } 226 227 // Special handling for stack overflow: since we don't have any (java) stack 228 // space left we use the pre-allocated & pre-initialized StackOverflowError 229 // klass to create an stack overflow error instance. We do not call its 230 // constructor for the same reason (it is empty, anyway). 231 IRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* thread)) 232 Handle exception = get_preinitialized_exception( 233 SystemDictionary::StackOverflowError_klass(), 234 CHECK); 235 THROW_HANDLE(exception); 236 IRT_END 237 238 239 IRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* thread, char* name, char* message)) 240 // lookup exception klass 241 symbolHandle s = oopFactory::new_symbol_handle(name, CHECK); 242 if (ProfileTraps) { 243 if (s == vmSymbols::java_lang_ArithmeticException()) { 244 note_trap(thread, Deoptimization::Reason_div0_check, CHECK); 245 } else if (s == vmSymbols::java_lang_NullPointerException()) { 246 note_trap(thread, Deoptimization::Reason_null_check, CHECK); 247 } 248 } 249 // create exception 250 Handle exception = Exceptions::new_exception(thread, s(), message); 251 thread->set_vm_result(exception()); 252 IRT_END 253 254 255 IRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* thread, char* name, oopDesc* obj)) 256 ResourceMark rm(thread); 257 const char* klass_name = Klass::cast(obj->klass())->external_name(); 258 // lookup exception klass 259 symbolHandle s = oopFactory::new_symbol_handle(name, CHECK); 260 if (ProfileTraps) { 261 note_trap(thread, Deoptimization::Reason_class_check, CHECK); 262 } 263 // create exception, with klass name as detail message 264 Handle exception = Exceptions::new_exception(thread, s(), klass_name); 265 thread->set_vm_result(exception()); 266 IRT_END 267 268 269 IRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* thread, char* name, jint index)) 270 char message[jintAsStringSize]; 271 // lookup exception klass 272 symbolHandle s = oopFactory::new_symbol_handle(name, CHECK); 273 if (ProfileTraps) { 274 note_trap(thread, Deoptimization::Reason_range_check, CHECK); 275 } 276 // create exception 277 sprintf(message, "%d", index); 278 THROW_MSG(s(), message); 279 IRT_END 280 281 IRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException( 282 JavaThread* thread, oopDesc* obj)) 283 284 ResourceMark rm(thread); 285 char* message = SharedRuntime::generate_class_cast_message( 286 thread, Klass::cast(obj->klass())->external_name()); 287 288 if (ProfileTraps) { 289 note_trap(thread, Deoptimization::Reason_class_check, CHECK); 290 } 291 292 // create exception 293 THROW_MSG(vmSymbols::java_lang_ClassCastException(), message); 294 IRT_END 295 296 // required can be either a MethodType, or a Class (for a single argument) 297 // actual (if not null) can be either a MethodHandle, or an arbitrary value (for a single argument) 298 IRT_ENTRY(void, InterpreterRuntime::throw_WrongMethodTypeException(JavaThread* thread, 299 oopDesc* required, 300 oopDesc* actual)) { 301 ResourceMark rm(thread); 302 char* message = SharedRuntime::generate_wrong_method_type_message(thread, required, actual); 303 304 if (ProfileTraps) { 305 note_trap(thread, Deoptimization::Reason_constraint, CHECK); 306 } 307 308 // create exception 309 THROW_MSG(vmSymbols::java_dyn_WrongMethodTypeException(), message); 310 } 311 IRT_END 312 313 314 315 // exception_handler_for_exception(...) returns the continuation address, 316 // the exception oop (via TLS) and sets the bci/bcp for the continuation. 317 // The exception oop is returned to make sure it is preserved over GC (it 318 // is only on the stack if the exception was thrown explicitly via athrow). 319 // During this operation, the expression stack contains the values for the 320 // bci where the exception happened. If the exception was propagated back 321 // from a call, the expression stack contains the values for the bci at the 322 // invoke w/o arguments (i.e., as if one were inside the call). 323 IRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* thread, oopDesc* exception)) 324 325 Handle h_exception(thread, exception); 326 methodHandle h_method (thread, method(thread)); 327 constantPoolHandle h_constants(thread, h_method->constants()); 328 typeArrayHandle h_extable (thread, h_method->exception_table()); 329 bool should_repeat; 330 int handler_bci; 331 int current_bci = bcp(thread) - h_method->code_base(); 332 333 // Need to do this check first since when _do_not_unlock_if_synchronized 334 // is set, we don't want to trigger any classloading which may make calls 335 // into java, or surprisingly find a matching exception handler for bci 0 336 // since at this moment the method hasn't been "officially" entered yet. 337 if (thread->do_not_unlock_if_synchronized()) { 338 ResourceMark rm; 339 assert(current_bci == 0, "bci isn't zero for do_not_unlock_if_synchronized"); 340 thread->set_vm_result(exception); 341 #ifdef CC_INTERP 342 return (address) -1; 343 #else 344 return Interpreter::remove_activation_entry(); 345 #endif 346 } 347 348 do { 349 should_repeat = false; 350 351 // assertions 352 #ifdef ASSERT 353 assert(h_exception.not_null(), "NULL exceptions should be handled by athrow"); 354 assert(h_exception->is_oop(), "just checking"); 355 // Check that exception is a subclass of Throwable, otherwise we have a VerifyError 356 if (!(h_exception->is_a(SystemDictionary::throwable_klass()))) { 357 if (ExitVMOnVerifyError) vm_exit(-1); 358 ShouldNotReachHere(); 359 } 360 #endif 361 362 // tracing 363 if (TraceExceptions) { 364 ttyLocker ttyl; 365 ResourceMark rm(thread); 366 tty->print_cr("Exception <%s> (" INTPTR_FORMAT ")", h_exception->print_value_string(), (address)h_exception()); 367 tty->print_cr(" thrown in interpreter method <%s>", h_method->print_value_string()); 368 tty->print_cr(" at bci %d for thread " INTPTR_FORMAT, current_bci, thread); 369 } 370 // Don't go paging in something which won't be used. 371 // else if (h_extable->length() == 0) { 372 // // disabled for now - interpreter is not using shortcut yet 373 // // (shortcut is not to call runtime if we have no exception handlers) 374 // // warning("performance bug: should not call runtime if method has no exception handlers"); 375 // } 376 // for AbortVMOnException flag 377 NOT_PRODUCT(Exceptions::debug_check_abort(h_exception)); 378 379 // exception handler lookup 380 KlassHandle h_klass(THREAD, h_exception->klass()); 381 handler_bci = h_method->fast_exception_handler_bci_for(h_klass, current_bci, THREAD); 382 if (HAS_PENDING_EXCEPTION) { 383 // We threw an exception while trying to find the exception handler. 384 // Transfer the new exception to the exception handle which will 385 // be set into thread local storage, and do another lookup for an 386 // exception handler for this exception, this time starting at the 387 // BCI of the exception handler which caused the exception to be 388 // thrown (bug 4307310). 389 h_exception = Handle(THREAD, PENDING_EXCEPTION); 390 CLEAR_PENDING_EXCEPTION; 391 if (handler_bci >= 0) { 392 current_bci = handler_bci; 393 should_repeat = true; 394 } 395 } 396 } while (should_repeat == true); 397 398 // notify JVMTI of an exception throw; JVMTI will detect if this is a first 399 // time throw or a stack unwinding throw and accordingly notify the debugger 400 if (JvmtiExport::can_post_exceptions()) { 401 JvmtiExport::post_exception_throw(thread, h_method(), bcp(thread), h_exception()); 402 } 403 404 #ifdef CC_INTERP 405 address continuation = (address)(intptr_t) handler_bci; 406 #else 407 address continuation = NULL; 408 #endif 409 address handler_pc = NULL; 410 if (handler_bci < 0 || !thread->reguard_stack((address) &continuation)) { 411 // Forward exception to callee (leaving bci/bcp untouched) because (a) no 412 // handler in this method, or (b) after a stack overflow there is not yet 413 // enough stack space available to reprotect the stack. 414 #ifndef CC_INTERP 415 continuation = Interpreter::remove_activation_entry(); 416 #endif 417 // Count this for compilation purposes 418 h_method->interpreter_throwout_increment(); 419 } else { 420 // handler in this method => change bci/bcp to handler bci/bcp and continue there 421 handler_pc = h_method->code_base() + handler_bci; 422 #ifndef CC_INTERP 423 set_bcp_and_mdp(handler_pc, thread); 424 continuation = Interpreter::dispatch_table(vtos)[*handler_pc]; 425 #endif 426 } 427 // notify debugger of an exception catch 428 // (this is good for exceptions caught in native methods as well) 429 if (JvmtiExport::can_post_exceptions()) { 430 JvmtiExport::notice_unwind_due_to_exception(thread, h_method(), handler_pc, h_exception(), (handler_pc != NULL)); 431 } 432 433 thread->set_vm_result(h_exception()); 434 return continuation; 435 IRT_END 436 437 438 IRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* thread)) 439 assert(thread->has_pending_exception(), "must only ne called if there's an exception pending"); 440 // nothing to do - eventually we should remove this code entirely (see comments @ call sites) 441 IRT_END 442 443 444 IRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* thread)) 445 THROW(vmSymbols::java_lang_AbstractMethodError()); 446 IRT_END 447 448 449 IRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* thread)) 450 THROW(vmSymbols::java_lang_IncompatibleClassChangeError()); 451 IRT_END 452 453 454 //------------------------------------------------------------------------------------------------------------------------ 455 // Fields 456 // 457 458 IRT_ENTRY(void, InterpreterRuntime::resolve_get_put(JavaThread* thread, Bytecodes::Code bytecode)) 459 // resolve field 460 FieldAccessInfo info; 461 constantPoolHandle pool(thread, method(thread)->constants()); 462 bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic); 463 464 { 465 JvmtiHideSingleStepping jhss(thread); 466 LinkResolver::resolve_field(info, pool, two_byte_index(thread), 467 bytecode, false, CHECK); 468 } // end JvmtiHideSingleStepping 469 470 // check if link resolution caused cpCache to be updated 471 if (already_resolved(thread)) return; 472 473 // compute auxiliary field attributes 474 TosState state = as_TosState(info.field_type()); 475 476 // We need to delay resolving put instructions on final fields 477 // until we actually invoke one. This is required so we throw 478 // exceptions at the correct place. If we do not resolve completely 479 // in the current pass, leaving the put_code set to zero will 480 // cause the next put instruction to reresolve. 481 bool is_put = (bytecode == Bytecodes::_putfield || 482 bytecode == Bytecodes::_putstatic); 483 Bytecodes::Code put_code = (Bytecodes::Code)0; 484 485 // We also need to delay resolving getstatic instructions until the 486 // class is intitialized. This is required so that access to the static 487 // field will call the initialization function every time until the class 488 // is completely initialized ala. in 2.17.5 in JVM Specification. 489 instanceKlass *klass = instanceKlass::cast(info.klass()->as_klassOop()); 490 bool uninitialized_static = ((bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic) && 491 !klass->is_initialized()); 492 Bytecodes::Code get_code = (Bytecodes::Code)0; 493 494 495 if (!uninitialized_static) { 496 get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield); 497 if (is_put || !info.access_flags().is_final()) { 498 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield); 499 } 500 } 501 502 cache_entry(thread)->set_field( 503 get_code, 504 put_code, 505 info.klass(), 506 info.field_index(), 507 info.field_offset(), 508 state, 509 info.access_flags().is_final(), 510 info.access_flags().is_volatile() 511 ); 512 IRT_END 513 514 515 //------------------------------------------------------------------------------------------------------------------------ 516 // Synchronization 517 // 518 // The interpreter's synchronization code is factored out so that it can 519 // be shared by method invocation and synchronized blocks. 520 //%note synchronization_3 521 522 static void trace_locking(Handle& h_locking_obj, bool is_locking) { 523 ObjectSynchronizer::trace_locking(h_locking_obj, false, true, is_locking); 524 } 525 526 527 //%note monitor_1 528 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* thread, BasicObjectLock* elem)) 529 #ifdef ASSERT 530 thread->last_frame().interpreter_frame_verify_monitor(elem); 531 #endif 532 if (PrintBiasedLockingStatistics) { 533 Atomic::inc(BiasedLocking::slow_path_entry_count_addr()); 534 } 535 Handle h_obj(thread, elem->obj()); 536 assert(Universe::heap()->is_in_reserved_or_null(h_obj()), 537 "must be NULL or an object"); 538 if (UseBiasedLocking) { 539 // Retry fast entry if bias is revoked to avoid unnecessary inflation 540 ObjectSynchronizer::fast_enter(h_obj, elem->lock(), true, CHECK); 541 } else { 542 ObjectSynchronizer::slow_enter(h_obj, elem->lock(), CHECK); 543 } 544 assert(Universe::heap()->is_in_reserved_or_null(elem->obj()), 545 "must be NULL or an object"); 546 #ifdef ASSERT 547 thread->last_frame().interpreter_frame_verify_monitor(elem); 548 #endif 549 IRT_END 550 551 552 //%note monitor_1 553 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorexit(JavaThread* thread, BasicObjectLock* elem)) 554 #ifdef ASSERT 555 thread->last_frame().interpreter_frame_verify_monitor(elem); 556 #endif 557 Handle h_obj(thread, elem->obj()); 558 assert(Universe::heap()->is_in_reserved_or_null(h_obj()), 559 "must be NULL or an object"); 560 if (elem == NULL || h_obj()->is_unlocked()) { 561 THROW(vmSymbols::java_lang_IllegalMonitorStateException()); 562 } 563 ObjectSynchronizer::slow_exit(h_obj(), elem->lock(), thread); 564 // Free entry. This must be done here, since a pending exception might be installed on 565 // exit. If it is not cleared, the exception handling code will try to unlock the monitor again. 566 elem->set_obj(NULL); 567 #ifdef ASSERT 568 thread->last_frame().interpreter_frame_verify_monitor(elem); 569 #endif 570 IRT_END 571 572 573 IRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* thread)) 574 THROW(vmSymbols::java_lang_IllegalMonitorStateException()); 575 IRT_END 576 577 578 IRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* thread)) 579 // Returns an illegal exception to install into the current thread. The 580 // pending_exception flag is cleared so normal exception handling does not 581 // trigger. Any current installed exception will be overwritten. This 582 // method will be called during an exception unwind. 583 584 assert(!HAS_PENDING_EXCEPTION, "no pending exception"); 585 Handle exception(thread, thread->vm_result()); 586 assert(exception() != NULL, "vm result should be set"); 587 thread->set_vm_result(NULL); // clear vm result before continuing (may cause memory leaks and assert failures) 588 if (!exception->is_a(SystemDictionary::threaddeath_klass())) { 589 exception = get_preinitialized_exception( 590 SystemDictionary::IllegalMonitorStateException_klass(), 591 CATCH); 592 } 593 thread->set_vm_result(exception()); 594 IRT_END 595 596 597 //------------------------------------------------------------------------------------------------------------------------ 598 // Invokes 599 600 IRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* thread, methodOopDesc* method, address bcp)) 601 return method->orig_bytecode_at(method->bci_from(bcp)); 602 IRT_END 603 604 IRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* thread, methodOopDesc* method, address bcp, Bytecodes::Code new_code)) 605 method->set_orig_bytecode_at(method->bci_from(bcp), new_code); 606 IRT_END 607 608 IRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* thread, methodOopDesc* method, address bcp)) 609 JvmtiExport::post_raw_breakpoint(thread, method, bcp); 610 IRT_END 611 612 IRT_ENTRY(void, InterpreterRuntime::resolve_invoke(JavaThread* thread, Bytecodes::Code bytecode)) 613 // extract receiver from the outgoing argument list if necessary 614 Handle receiver(thread, NULL); 615 if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface) { 616 ResourceMark rm(thread); 617 methodHandle m (thread, method(thread)); 618 int bci = m->bci_from(bcp(thread)); 619 Bytecode_invoke* call = Bytecode_invoke_at(m, bci); 620 symbolHandle signature (thread, call->signature()); 621 receiver = Handle(thread, 622 thread->last_frame().interpreter_callee_receiver(signature)); 623 assert(Universe::heap()->is_in_reserved_or_null(receiver()), 624 "sanity check"); 625 assert(receiver.is_null() || 626 Universe::heap()->is_in_reserved(receiver->klass()), 627 "sanity check"); 628 } 629 630 // resolve method 631 CallInfo info; 632 constantPoolHandle pool(thread, method(thread)->constants()); 633 634 { 635 JvmtiHideSingleStepping jhss(thread); 636 LinkResolver::resolve_invoke(info, receiver, pool, 637 two_byte_index(thread), bytecode, CHECK); 638 if (JvmtiExport::can_hotswap_or_post_breakpoint()) { 639 int retry_count = 0; 640 while (info.resolved_method()->is_old()) { 641 // It is very unlikely that method is redefined more than 100 times 642 // in the middle of resolve. If it is looping here more than 100 times 643 // means then there could be a bug here. 644 guarantee((retry_count++ < 100), 645 "Could not resolve to latest version of redefined method"); 646 // method is redefined in the middle of resolve so re-try. 647 LinkResolver::resolve_invoke(info, receiver, pool, 648 two_byte_index(thread), bytecode, CHECK); 649 } 650 } 651 } // end JvmtiHideSingleStepping 652 653 // check if link resolution caused cpCache to be updated 654 if (already_resolved(thread)) return; 655 656 if (bytecode == Bytecodes::_invokeinterface) { 657 658 if (TraceItables && Verbose) { 659 ResourceMark rm(thread); 660 tty->print_cr("Resolving: klass: %s to method: %s", info.resolved_klass()->name()->as_C_string(), info.resolved_method()->name()->as_C_string()); 661 } 662 if (info.resolved_method()->method_holder() == 663 SystemDictionary::object_klass()) { 664 // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec 665 // (see also cpCacheOop.cpp for details) 666 methodHandle rm = info.resolved_method(); 667 assert(rm->is_final() || info.has_vtable_index(), 668 "should have been set already"); 669 cache_entry(thread)->set_method(bytecode, rm, info.vtable_index()); 670 } else { 671 // Setup itable entry 672 int index = klassItable::compute_itable_index(info.resolved_method()()); 673 cache_entry(thread)->set_interface_call(info.resolved_method(), index); 674 } 675 } else { 676 cache_entry(thread)->set_method( 677 bytecode, 678 info.resolved_method(), 679 info.vtable_index()); 680 } 681 IRT_END 682 683 684 // First time execution: Resolve symbols, create a permanent CallSite object. 685 IRT_ENTRY(void, InterpreterRuntime::resolve_invokedynamic(JavaThread* thread)) { 686 ResourceMark rm(thread); 687 688 assert(EnableInvokeDynamic, ""); 689 690 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic; 691 692 methodHandle caller_method(thread, method(thread)); 693 694 // first determine if there is a bootstrap method 695 { 696 KlassHandle caller_klass(thread, caller_method->method_holder()); 697 Handle bootm = SystemDictionary::find_bootstrap_method(caller_klass, KlassHandle(), CHECK); 698 if (bootm.is_null()) { 699 // If there is no bootstrap method, throw IncompatibleClassChangeError. 700 // This is a valid generic error type for resolution (JLS 12.3.3). 701 char buf[200]; 702 jio_snprintf(buf, sizeof(buf), "Class %s has not declared a bootstrap method for invokedynamic", 703 (Klass::cast(caller_klass()))->external_name()); 704 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 705 } 706 } 707 708 constantPoolHandle pool(thread, caller_method->constants()); 709 pool->set_invokedynamic(); // mark header to flag active call sites 710 711 int site_index = four_byte_index(thread); 712 // there is a second CPC entries that is of interest; it caches signature info: 713 int main_index = pool->cache()->secondary_entry_at(site_index)->main_entry_index(); 714 715 // first resolve the signature to a MH.invoke methodOop 716 if (!pool->cache()->entry_at(main_index)->is_resolved(bytecode)) { 717 JvmtiHideSingleStepping jhss(thread); 718 CallInfo info; 719 LinkResolver::resolve_invoke(info, Handle(), pool, 720 site_index, bytecode, CHECK); 721 // The main entry corresponds to a JVM_CONSTANT_NameAndType, and serves 722 // as a common reference point for all invokedynamic call sites with 723 // that exact call descriptor. We will link it in the CP cache exactly 724 // as if it were an invokevirtual of MethodHandle.invoke. 725 pool->cache()->entry_at(main_index)->set_method( 726 bytecode, 727 info.resolved_method(), 728 info.vtable_index()); 729 assert(pool->cache()->entry_at(main_index)->is_vfinal(), "f2 must be a methodOop"); 730 } 731 732 // The method (f2 entry) of the main entry is the MH.invoke for the 733 // invokedynamic target call signature. 734 intptr_t f2_value = pool->cache()->entry_at(main_index)->f2(); 735 methodHandle mh_invdyn(THREAD, (methodOop) f2_value); 736 assert(mh_invdyn.not_null() && mh_invdyn->is_method() && mh_invdyn->is_method_handle_invoke(), 737 "correct result from LinkResolver::resolve_invokedynamic"); 738 739 symbolHandle call_site_name(THREAD, pool->name_ref_at(site_index)); 740 Handle call_site 741 = SystemDictionary::make_dynamic_call_site(caller_method->method_holder(), 742 caller_method->method_idnum(), 743 caller_method->bci_from(bcp(thread)), 744 call_site_name, 745 mh_invdyn, 746 CHECK); 747 748 // In the secondary entry, the f1 field is the call site, and the f2 (index) 749 // field is some data about the invoke site. 750 int extra_data = 0; 751 pool->cache()->secondary_entry_at(site_index)->set_dynamic_call(call_site(), extra_data); 752 } 753 IRT_END 754 755 756 //------------------------------------------------------------------------------------------------------------------------ 757 // Miscellaneous 758 759 760 #ifndef PRODUCT 761 static void trace_frequency_counter_overflow(methodHandle m, int branch_bci, int bci, address branch_bcp) { 762 if (TraceInvocationCounterOverflow) { 763 InvocationCounter* ic = m->invocation_counter(); 764 InvocationCounter* bc = m->backedge_counter(); 765 ResourceMark rm; 766 const char* msg = 767 branch_bcp == NULL 768 ? "comp-policy cntr ovfl @ %d in entry of " 769 : "comp-policy cntr ovfl @ %d in loop of "; 770 tty->print(msg, bci); 771 m->print_value(); 772 tty->cr(); 773 ic->print(); 774 bc->print(); 775 if (ProfileInterpreter) { 776 if (branch_bcp != NULL) { 777 methodDataOop mdo = m->method_data(); 778 if (mdo != NULL) { 779 int count = mdo->bci_to_data(branch_bci)->as_JumpData()->taken(); 780 tty->print_cr("back branch count = %d", count); 781 } 782 } 783 } 784 } 785 } 786 787 static void trace_osr_request(methodHandle method, nmethod* osr, int bci) { 788 if (TraceOnStackReplacement) { 789 ResourceMark rm; 790 tty->print(osr != NULL ? "Reused OSR entry for " : "Requesting OSR entry for "); 791 method->print_short_name(tty); 792 tty->print_cr(" at bci %d", bci); 793 } 794 } 795 #endif // !PRODUCT 796 797 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* thread, address branch_bcp) { 798 nmethod* nm = frequency_counter_overflow_inner(thread, branch_bcp); 799 assert(branch_bcp != NULL || nm == NULL, "always returns null for non OSR requests"); 800 if (branch_bcp != NULL && nm != NULL) { 801 // This was a successful request for an OSR nmethod. Because 802 // frequency_counter_overflow_inner ends with a safepoint check, 803 // nm could have been unloaded so look it up again. It's unsafe 804 // to examine nm directly since it might have been freed and used 805 // for something else. 806 frame fr = thread->last_frame(); 807 methodOop method = fr.interpreter_frame_method(); 808 int bci = method->bci_from(fr.interpreter_frame_bcp()); 809 nm = method->lookup_osr_nmethod_for(bci); 810 } 811 return nm; 812 } 813 814 IRT_ENTRY(nmethod*, 815 InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* thread, address branch_bcp)) 816 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized 817 // flag, in case this method triggers classloading which will call into Java. 818 UnlockFlagSaver fs(thread); 819 820 frame fr = thread->last_frame(); 821 assert(fr.is_interpreted_frame(), "must come from interpreter"); 822 methodHandle method(thread, fr.interpreter_frame_method()); 823 const int branch_bci = branch_bcp != NULL ? method->bci_from(branch_bcp) : 0; 824 const int bci = method->bci_from(fr.interpreter_frame_bcp()); 825 NOT_PRODUCT(trace_frequency_counter_overflow(method, branch_bci, bci, branch_bcp);) 826 827 if (JvmtiExport::can_post_interpreter_events()) { 828 if (thread->is_interp_only_mode()) { 829 // If certain JVMTI events (e.g. frame pop event) are requested then the 830 // thread is forced to remain in interpreted code. This is 831 // implemented partly by a check in the run_compiled_code 832 // section of the interpreter whether we should skip running 833 // compiled code, and partly by skipping OSR compiles for 834 // interpreted-only threads. 835 if (branch_bcp != NULL) { 836 CompilationPolicy::policy()->reset_counter_for_back_branch_event(method); 837 return NULL; 838 } 839 } 840 } 841 842 if (branch_bcp == NULL) { 843 // when code cache is full, compilation gets switched off, UseCompiler 844 // is set to false 845 if (!method->has_compiled_code() && UseCompiler) { 846 CompilationPolicy::policy()->method_invocation_event(method, CHECK_NULL); 847 } else { 848 // Force counter overflow on method entry, even if no compilation 849 // happened. (The method_invocation_event call does this also.) 850 CompilationPolicy::policy()->reset_counter_for_invocation_event(method); 851 } 852 // compilation at an invocation overflow no longer goes and retries test for 853 // compiled method. We always run the loser of the race as interpreted. 854 // so return NULL 855 return NULL; 856 } else { 857 // counter overflow in a loop => try to do on-stack-replacement 858 nmethod* osr_nm = method->lookup_osr_nmethod_for(bci); 859 NOT_PRODUCT(trace_osr_request(method, osr_nm, bci);) 860 // when code cache is full, we should not compile any more... 861 if (osr_nm == NULL && UseCompiler) { 862 const int branch_bci = method->bci_from(branch_bcp); 863 CompilationPolicy::policy()->method_back_branch_event(method, branch_bci, bci, CHECK_NULL); 864 osr_nm = method->lookup_osr_nmethod_for(bci); 865 } 866 if (osr_nm == NULL) { 867 CompilationPolicy::policy()->reset_counter_for_back_branch_event(method); 868 return NULL; 869 } else { 870 // We may need to do on-stack replacement which requires that no 871 // monitors in the activation are biased because their 872 // BasicObjectLocks will need to migrate during OSR. Force 873 // unbiasing of all monitors in the activation now (even though 874 // the OSR nmethod might be invalidated) because we don't have a 875 // safepoint opportunity later once the migration begins. 876 if (UseBiasedLocking) { 877 ResourceMark rm; 878 GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>(); 879 for( BasicObjectLock *kptr = fr.interpreter_frame_monitor_end(); 880 kptr < fr.interpreter_frame_monitor_begin(); 881 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) { 882 if( kptr->obj() != NULL ) { 883 objects_to_revoke->append(Handle(THREAD, kptr->obj())); 884 } 885 } 886 BiasedLocking::revoke(objects_to_revoke); 887 } 888 return osr_nm; 889 } 890 } 891 IRT_END 892 893 IRT_LEAF(jint, InterpreterRuntime::bcp_to_di(methodOopDesc* method, address cur_bcp)) 894 assert(ProfileInterpreter, "must be profiling interpreter"); 895 int bci = method->bci_from(cur_bcp); 896 methodDataOop mdo = method->method_data(); 897 if (mdo == NULL) return 0; 898 return mdo->bci_to_di(bci); 899 IRT_END 900 901 IRT_ENTRY(jint, InterpreterRuntime::profile_method(JavaThread* thread, address cur_bcp)) 902 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized 903 // flag, in case this method triggers classloading which will call into Java. 904 UnlockFlagSaver fs(thread); 905 906 assert(ProfileInterpreter, "must be profiling interpreter"); 907 frame fr = thread->last_frame(); 908 assert(fr.is_interpreted_frame(), "must come from interpreter"); 909 methodHandle method(thread, fr.interpreter_frame_method()); 910 int bci = method->bci_from(cur_bcp); 911 methodOopDesc::build_interpreter_method_data(method, THREAD); 912 if (HAS_PENDING_EXCEPTION) { 913 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here"); 914 CLEAR_PENDING_EXCEPTION; 915 // and fall through... 916 } 917 methodDataOop mdo = method->method_data(); 918 if (mdo == NULL) return 0; 919 return mdo->bci_to_di(bci); 920 IRT_END 921 922 923 #ifdef ASSERT 924 IRT_LEAF(void, InterpreterRuntime::verify_mdp(methodOopDesc* method, address bcp, address mdp)) 925 assert(ProfileInterpreter, "must be profiling interpreter"); 926 927 methodDataOop mdo = method->method_data(); 928 assert(mdo != NULL, "must not be null"); 929 930 int bci = method->bci_from(bcp); 931 932 address mdp2 = mdo->bci_to_dp(bci); 933 if (mdp != mdp2) { 934 ResourceMark rm; 935 ResetNoHandleMark rnm; // In a LEAF entry. 936 HandleMark hm; 937 tty->print_cr("FAILED verify : actual mdp %p expected mdp %p @ bci %d", mdp, mdp2, bci); 938 int current_di = mdo->dp_to_di(mdp); 939 int expected_di = mdo->dp_to_di(mdp2); 940 tty->print_cr(" actual di %d expected di %d", current_di, expected_di); 941 int expected_approx_bci = mdo->data_at(expected_di)->bci(); 942 int approx_bci = -1; 943 if (current_di >= 0) { 944 approx_bci = mdo->data_at(current_di)->bci(); 945 } 946 tty->print_cr(" actual bci is %d expected bci %d", approx_bci, expected_approx_bci); 947 mdo->print_on(tty); 948 method->print_codes(); 949 } 950 assert(mdp == mdp2, "wrong mdp"); 951 IRT_END 952 #endif // ASSERT 953 954 IRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* thread, int return_bci)) 955 assert(ProfileInterpreter, "must be profiling interpreter"); 956 ResourceMark rm(thread); 957 HandleMark hm(thread); 958 frame fr = thread->last_frame(); 959 assert(fr.is_interpreted_frame(), "must come from interpreter"); 960 methodDataHandle h_mdo(thread, fr.interpreter_frame_method()->method_data()); 961 962 // Grab a lock to ensure atomic access to setting the return bci and 963 // the displacement. This can block and GC, invalidating all naked oops. 964 MutexLocker ml(RetData_lock); 965 966 // ProfileData is essentially a wrapper around a derived oop, so we 967 // need to take the lock before making any ProfileData structures. 968 ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(fr.interpreter_frame_mdp())); 969 RetData* rdata = data->as_RetData(); 970 address new_mdp = rdata->fixup_ret(return_bci, h_mdo); 971 fr.interpreter_frame_set_mdp(new_mdp); 972 IRT_END 973 974 975 IRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* thread)) 976 // We used to need an explict preserve_arguments here for invoke bytecodes. However, 977 // stack traversal automatically takes care of preserving arguments for invoke, so 978 // this is no longer needed. 979 980 // IRT_END does an implicit safepoint check, hence we are guaranteed to block 981 // if this is called during a safepoint 982 983 if (JvmtiExport::should_post_single_step()) { 984 // We are called during regular safepoints and when the VM is 985 // single stepping. If any thread is marked for single stepping, 986 // then we may have JVMTI work to do. 987 JvmtiExport::at_single_stepping_point(thread, method(thread), bcp(thread)); 988 } 989 IRT_END 990 991 IRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread *thread, oopDesc* obj, 992 ConstantPoolCacheEntry *cp_entry)) 993 994 // check the access_flags for the field in the klass 995 instanceKlass* ik = instanceKlass::cast((klassOop)cp_entry->f1()); 996 typeArrayOop fields = ik->fields(); 997 int index = cp_entry->field_index(); 998 assert(index < fields->length(), "holders field index is out of range"); 999 // bail out if field accesses are not watched 1000 if ((fields->ushort_at(index) & JVM_ACC_FIELD_ACCESS_WATCHED) == 0) return; 1001 1002 switch(cp_entry->flag_state()) { 1003 case btos: // fall through 1004 case ctos: // fall through 1005 case stos: // fall through 1006 case itos: // fall through 1007 case ftos: // fall through 1008 case ltos: // fall through 1009 case dtos: // fall through 1010 case atos: break; 1011 default: ShouldNotReachHere(); return; 1012 } 1013 bool is_static = (obj == NULL); 1014 HandleMark hm(thread); 1015 1016 Handle h_obj; 1017 if (!is_static) { 1018 // non-static field accessors have an object, but we need a handle 1019 h_obj = Handle(thread, obj); 1020 } 1021 instanceKlassHandle h_cp_entry_f1(thread, (klassOop)cp_entry->f1()); 1022 jfieldID fid = jfieldIDWorkaround::to_jfieldID(h_cp_entry_f1, cp_entry->f2(), is_static); 1023 JvmtiExport::post_field_access(thread, method(thread), bcp(thread), h_cp_entry_f1, h_obj, fid); 1024 IRT_END 1025 1026 IRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread *thread, 1027 oopDesc* obj, ConstantPoolCacheEntry *cp_entry, jvalue *value)) 1028 1029 klassOop k = (klassOop)cp_entry->f1(); 1030 1031 // check the access_flags for the field in the klass 1032 instanceKlass* ik = instanceKlass::cast(k); 1033 typeArrayOop fields = ik->fields(); 1034 int index = cp_entry->field_index(); 1035 assert(index < fields->length(), "holders field index is out of range"); 1036 // bail out if field modifications are not watched 1037 if ((fields->ushort_at(index) & JVM_ACC_FIELD_MODIFICATION_WATCHED) == 0) return; 1038 1039 char sig_type = '\0'; 1040 1041 switch(cp_entry->flag_state()) { 1042 case btos: sig_type = 'Z'; break; 1043 case ctos: sig_type = 'C'; break; 1044 case stos: sig_type = 'S'; break; 1045 case itos: sig_type = 'I'; break; 1046 case ftos: sig_type = 'F'; break; 1047 case atos: sig_type = 'L'; break; 1048 case ltos: sig_type = 'J'; break; 1049 case dtos: sig_type = 'D'; break; 1050 default: ShouldNotReachHere(); return; 1051 } 1052 bool is_static = (obj == NULL); 1053 1054 HandleMark hm(thread); 1055 instanceKlassHandle h_klass(thread, k); 1056 jfieldID fid = jfieldIDWorkaround::to_jfieldID(h_klass, cp_entry->f2(), is_static); 1057 jvalue fvalue; 1058 #ifdef _LP64 1059 fvalue = *value; 1060 #else 1061 // Long/double values are stored unaligned and also noncontiguously with 1062 // tagged stacks. We can't just do a simple assignment even in the non- 1063 // J/D cases because a C++ compiler is allowed to assume that a jvalue is 1064 // 8-byte aligned, and interpreter stack slots are only 4-byte aligned. 1065 // We assume that the two halves of longs/doubles are stored in interpreter 1066 // stack slots in platform-endian order. 1067 jlong_accessor u; 1068 jint* newval = (jint*)value; 1069 u.words[0] = newval[0]; 1070 u.words[1] = newval[Interpreter::stackElementWords()]; // skip if tag 1071 fvalue.j = u.long_value; 1072 #endif // _LP64 1073 1074 Handle h_obj; 1075 if (!is_static) { 1076 // non-static field accessors have an object, but we need a handle 1077 h_obj = Handle(thread, obj); 1078 } 1079 1080 JvmtiExport::post_raw_field_modification(thread, method(thread), bcp(thread), h_klass, h_obj, 1081 fid, sig_type, &fvalue); 1082 IRT_END 1083 1084 IRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread *thread)) 1085 JvmtiExport::post_method_entry(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread)); 1086 IRT_END 1087 1088 1089 IRT_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread *thread)) 1090 JvmtiExport::post_method_exit(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread)); 1091 IRT_END 1092 1093 IRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc)) 1094 { 1095 return (Interpreter::contains(pc) ? 1 : 0); 1096 } 1097 IRT_END 1098 1099 1100 // Implementation of SignatureHandlerLibrary 1101 1102 address SignatureHandlerLibrary::set_handler_blob() { 1103 BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size); 1104 if (handler_blob == NULL) { 1105 return NULL; 1106 } 1107 address handler = handler_blob->instructions_begin(); 1108 _handler_blob = handler_blob; 1109 _handler = handler; 1110 return handler; 1111 } 1112 1113 void SignatureHandlerLibrary::initialize() { 1114 if (_fingerprints != NULL) { 1115 return; 1116 } 1117 if (set_handler_blob() == NULL) { 1118 vm_exit_out_of_memory(blob_size, "native signature handlers"); 1119 } 1120 1121 BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer", 1122 SignatureHandlerLibrary::buffer_size); 1123 _buffer = bb->instructions_begin(); 1124 1125 _fingerprints = new(ResourceObj::C_HEAP)GrowableArray<uint64_t>(32, true); 1126 _handlers = new(ResourceObj::C_HEAP)GrowableArray<address>(32, true); 1127 } 1128 1129 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) { 1130 address handler = _handler; 1131 int code_size = buffer->pure_code_size(); 1132 if (handler + code_size > _handler_blob->instructions_end()) { 1133 // get a new handler blob 1134 handler = set_handler_blob(); 1135 } 1136 if (handler != NULL) { 1137 memcpy(handler, buffer->code_begin(), code_size); 1138 pd_set_handler(handler); 1139 ICache::invalidate_range(handler, code_size); 1140 _handler = handler + code_size; 1141 } 1142 return handler; 1143 } 1144 1145 void SignatureHandlerLibrary::add(methodHandle method) { 1146 if (method->signature_handler() == NULL) { 1147 // use slow signature handler if we can't do better 1148 int handler_index = -1; 1149 // check if we can use customized (fast) signature handler 1150 if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::max_size_of_parameters) { 1151 // use customized signature handler 1152 MutexLocker mu(SignatureHandlerLibrary_lock); 1153 // make sure data structure is initialized 1154 initialize(); 1155 // lookup method signature's fingerprint 1156 uint64_t fingerprint = Fingerprinter(method).fingerprint(); 1157 handler_index = _fingerprints->find(fingerprint); 1158 // create handler if necessary 1159 if (handler_index < 0) { 1160 ResourceMark rm; 1161 ptrdiff_t align_offset = (address) 1162 round_to((intptr_t)_buffer, CodeEntryAlignment) - (address)_buffer; 1163 CodeBuffer buffer((address)(_buffer + align_offset), 1164 SignatureHandlerLibrary::buffer_size - align_offset); 1165 InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint); 1166 // copy into code heap 1167 address handler = set_handler(&buffer); 1168 if (handler == NULL) { 1169 // use slow signature handler 1170 } else { 1171 // debugging suppport 1172 if (PrintSignatureHandlers) { 1173 tty->cr(); 1174 tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)", 1175 _handlers->length(), 1176 (method->is_static() ? "static" : "receiver"), 1177 method->name_and_sig_as_C_string(), 1178 fingerprint, 1179 buffer.code_size()); 1180 Disassembler::decode(handler, handler + buffer.code_size()); 1181 #ifndef PRODUCT 1182 tty->print_cr(" --- associated result handler ---"); 1183 address rh_begin = Interpreter::result_handler(method()->result_type()); 1184 address rh_end = rh_begin; 1185 while (*(int*)rh_end != 0) { 1186 rh_end += sizeof(int); 1187 } 1188 Disassembler::decode(rh_begin, rh_end); 1189 #endif 1190 } 1191 // add handler to library 1192 _fingerprints->append(fingerprint); 1193 _handlers->append(handler); 1194 // set handler index 1195 assert(_fingerprints->length() == _handlers->length(), "sanity check"); 1196 handler_index = _fingerprints->length() - 1; 1197 } 1198 } 1199 } else { 1200 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 1201 } 1202 if (handler_index < 0) { 1203 // use generic signature handler 1204 method->set_signature_handler(Interpreter::slow_signature_handler()); 1205 } else { 1206 // set handler 1207 method->set_signature_handler(_handlers->at(handler_index)); 1208 } 1209 } 1210 assert(method->signature_handler() == Interpreter::slow_signature_handler() || 1211 _handlers->find(method->signature_handler()) == _fingerprints->find(Fingerprinter(method).fingerprint()), 1212 "sanity check"); 1213 } 1214 1215 1216 BufferBlob* SignatureHandlerLibrary::_handler_blob = NULL; 1217 address SignatureHandlerLibrary::_handler = NULL; 1218 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = NULL; 1219 GrowableArray<address>* SignatureHandlerLibrary::_handlers = NULL; 1220 address SignatureHandlerLibrary::_buffer = NULL; 1221 1222 1223 IRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* thread, methodOopDesc* method)) 1224 methodHandle m(thread, method); 1225 assert(m->is_native(), "sanity check"); 1226 // lookup native function entry point if it doesn't exist 1227 bool in_base_library; 1228 if (!m->has_native_function()) { 1229 NativeLookup::lookup(m, in_base_library, CHECK); 1230 } 1231 // make sure signature handler is installed 1232 SignatureHandlerLibrary::add(m); 1233 // The interpreter entry point checks the signature handler first, 1234 // before trying to fetch the native entry point and klass mirror. 1235 // We must set the signature handler last, so that multiple processors 1236 // preparing the same method will be sure to see non-null entry & mirror. 1237 IRT_END 1238 1239 #if defined(IA32) || defined(AMD64) 1240 IRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* thread, void* src_address, void* dest_address)) 1241 if (src_address == dest_address) { 1242 return; 1243 } 1244 ResetNoHandleMark rnm; // In a LEAF entry. 1245 HandleMark hm; 1246 ResourceMark rm; 1247 frame fr = thread->last_frame(); 1248 assert(fr.is_interpreted_frame(), ""); 1249 jint bci = fr.interpreter_frame_bci(); 1250 methodHandle mh(thread, fr.interpreter_frame_method()); 1251 Bytecode_invoke* invoke = Bytecode_invoke_at(mh, bci); 1252 ArgumentSizeComputer asc(invoke->signature()); 1253 int size_of_arguments = (asc.size() + (invoke->is_invokestatic() ? 0 : 1)); // receiver 1254 Copy::conjoint_bytes(src_address, dest_address, 1255 size_of_arguments * Interpreter::stackElementSize()); 1256 IRT_END 1257 #endif