1 /* 2 * Copyright (c) 1997, 2014, 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/systemDictionary.hpp" 27 #include "classfile/vmSymbols.hpp" 28 #include "compiler/compileBroker.hpp" 29 #include "compiler/disassembler.hpp" 30 #include "gc_interface/collectedHeap.hpp" 31 #include "interpreter/interpreter.hpp" 32 #include "interpreter/interpreterRuntime.hpp" 33 #include "interpreter/linkResolver.hpp" 34 #include "interpreter/templateTable.hpp" 35 #include "memory/oopFactory.hpp" 36 #include "memory/universe.inline.hpp" 37 #include "oops/constantPool.hpp" 38 #include "oops/instanceKlass.hpp" 39 #include "oops/methodData.hpp" 40 #include "oops/objArrayKlass.hpp" 41 #include "oops/oop.inline.hpp" 42 #include "oops/symbol.hpp" 43 #include "prims/jvmtiExport.hpp" 44 #include "prims/nativeLookup.hpp" 45 #include "runtime/atomic.inline.hpp" 46 #include "runtime/biasedLocking.hpp" 47 #include "runtime/compilationPolicy.hpp" 48 #include "runtime/deoptimization.hpp" 49 #include "runtime/fieldDescriptor.hpp" 50 #include "runtime/handles.inline.hpp" 51 #include "runtime/icache.hpp" 52 #include "runtime/interfaceSupport.hpp" 53 #include "runtime/java.hpp" 54 #include "runtime/jfieldIDWorkaround.hpp" 55 #include "runtime/osThread.hpp" 56 #include "runtime/sharedRuntime.hpp" 57 #include "runtime/stubRoutines.hpp" 58 #include "runtime/synchronizer.hpp" 59 #include "runtime/threadCritical.hpp" 60 #include "utilities/events.hpp" 61 #ifdef COMPILER2 62 #include "opto/runtime.hpp" 63 #endif 64 65 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC 66 67 class UnlockFlagSaver { 68 private: 69 JavaThread* _thread; 70 bool _do_not_unlock; 71 public: 72 UnlockFlagSaver(JavaThread* t) { 73 _thread = t; 74 _do_not_unlock = t->do_not_unlock_if_synchronized(); 75 t->set_do_not_unlock_if_synchronized(false); 76 } 77 ~UnlockFlagSaver() { 78 _thread->set_do_not_unlock_if_synchronized(_do_not_unlock); 79 } 80 }; 81 82 //------------------------------------------------------------------------------------------------------------------------ 83 // State accessors 84 85 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread *thread) { 86 last_frame(thread).interpreter_frame_set_bcp(bcp); 87 if (ProfileInterpreter) { 88 // ProfileTraps uses MDOs independently of ProfileInterpreter. 89 // That is why we must check both ProfileInterpreter and mdo != NULL. 90 MethodData* mdo = last_frame(thread).interpreter_frame_method()->method_data(); 91 if (mdo != NULL) { 92 NEEDS_CLEANUP; 93 last_frame(thread).interpreter_frame_set_mdp(mdo->bci_to_dp(last_frame(thread).interpreter_frame_bci())); 94 } 95 } 96 } 97 98 //------------------------------------------------------------------------------------------------------------------------ 99 // Constants 100 101 102 IRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* thread, bool wide)) 103 // access constant pool 104 ConstantPool* pool = method(thread)->constants(); 105 int index = wide ? get_index_u2(thread, Bytecodes::_ldc_w) : get_index_u1(thread, Bytecodes::_ldc); 106 constantTag tag = pool->tag_at(index); 107 108 assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call"); 109 Klass* klass = pool->klass_at(index, CHECK); 110 oop java_class = klass->java_mirror(); 111 thread->set_vm_result(java_class); 112 IRT_END 113 114 IRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* thread, Bytecodes::Code bytecode)) { 115 assert(bytecode == Bytecodes::_fast_aldc || 116 bytecode == Bytecodes::_fast_aldc_w, "wrong bc"); 117 ResourceMark rm(thread); 118 methodHandle m (thread, method(thread)); 119 Bytecode_loadconstant ldc(m, bci(thread)); 120 oop result = ldc.resolve_constant(CHECK); 121 #ifdef ASSERT 122 { 123 // The bytecode wrappers aren't GC-safe so construct a new one 124 Bytecode_loadconstant ldc2(m, bci(thread)); 125 oop coop = m->constants()->resolved_references()->obj_at(ldc2.cache_index()); 126 assert(result == coop, "expected result for assembly code"); 127 } 128 #endif 129 thread->set_vm_result(result); 130 } 131 IRT_END 132 133 134 //------------------------------------------------------------------------------------------------------------------------ 135 // Allocation 136 137 IRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* thread, ConstantPool* pool, int index)) 138 Klass* k_oop = pool->klass_at(index, CHECK); 139 instanceKlassHandle klass (THREAD, k_oop); 140 141 // Make sure we are not instantiating an abstract klass 142 klass->check_valid_for_instantiation(true, CHECK); 143 144 // Make sure klass is initialized 145 klass->initialize(CHECK); 146 147 // At this point the class may not be fully initialized 148 // because of recursive initialization. If it is fully 149 // initialized & has_finalized is not set, we rewrite 150 // it into its fast version (Note: no locking is needed 151 // here since this is an atomic byte write and can be 152 // done more than once). 153 // 154 // Note: In case of classes with has_finalized we don't 155 // rewrite since that saves us an extra check in 156 // the fast version which then would call the 157 // slow version anyway (and do a call back into 158 // Java). 159 // If we have a breakpoint, then we don't rewrite 160 // because the _breakpoint bytecode would be lost. 161 oop obj = klass->allocate_instance(CHECK); 162 thread->set_vm_result(obj); 163 IRT_END 164 165 166 IRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* thread, BasicType type, jint size)) 167 oop obj = oopFactory::new_typeArray(type, size, CHECK); 168 thread->set_vm_result(obj); 169 IRT_END 170 171 172 IRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* thread, ConstantPool* pool, int index, jint size)) 173 // Note: no oopHandle for pool & klass needed since they are not used 174 // anymore after new_objArray() and no GC can happen before. 175 // (This may have to change if this code changes!) 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 THROW_HANDLE(exception); 311 IRT_END 312 313 314 IRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* thread, char* name, char* message)) 315 // lookup exception klass 316 TempNewSymbol s = SymbolTable::new_symbol(name, CHECK); 317 if (ProfileTraps) { 318 if (s == vmSymbols::java_lang_ArithmeticException()) { 319 note_trap(thread, Deoptimization::Reason_div0_check, CHECK); 320 } else if (s == vmSymbols::java_lang_NullPointerException()) { 321 note_trap(thread, Deoptimization::Reason_null_check, CHECK); 322 } 323 } 324 // create exception 325 Handle exception = Exceptions::new_exception(thread, s, message); 326 thread->set_vm_result(exception()); 327 IRT_END 328 329 330 IRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* thread, char* name, oopDesc* obj)) 331 ResourceMark rm(thread); 332 const char* klass_name = obj->klass()->external_name(); 333 // lookup exception klass 334 TempNewSymbol s = SymbolTable::new_symbol(name, CHECK); 335 if (ProfileTraps) { 336 note_trap(thread, Deoptimization::Reason_class_check, CHECK); 337 } 338 // create exception, with klass name as detail message 339 Handle exception = Exceptions::new_exception(thread, s, klass_name); 340 thread->set_vm_result(exception()); 341 IRT_END 342 343 344 IRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* thread, char* name, jint index)) 345 char message[jintAsStringSize]; 346 // lookup exception klass 347 TempNewSymbol s = SymbolTable::new_symbol(name, CHECK); 348 if (ProfileTraps) { 349 note_trap(thread, Deoptimization::Reason_range_check, CHECK); 350 } 351 // create exception 352 sprintf(message, "%d", index); 353 THROW_MSG(s, message); 354 IRT_END 355 356 IRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException( 357 JavaThread* thread, oopDesc* obj)) 358 359 ResourceMark rm(thread); 360 char* message = SharedRuntime::generate_class_cast_message( 361 thread, obj->klass()->external_name()); 362 363 if (ProfileTraps) { 364 note_trap(thread, Deoptimization::Reason_class_check, CHECK); 365 } 366 367 // create exception 368 THROW_MSG(vmSymbols::java_lang_ClassCastException(), message); 369 IRT_END 370 371 // exception_handler_for_exception(...) returns the continuation address, 372 // the exception oop (via TLS) and sets the bci/bcp for the continuation. 373 // The exception oop is returned to make sure it is preserved over GC (it 374 // is only on the stack if the exception was thrown explicitly via athrow). 375 // During this operation, the expression stack contains the values for the 376 // bci where the exception happened. If the exception was propagated back 377 // from a call, the expression stack contains the values for the bci at the 378 // invoke w/o arguments (i.e., as if one were inside the call). 379 IRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* thread, oopDesc* exception)) 380 381 Handle h_exception(thread, exception); 382 methodHandle h_method (thread, method(thread)); 383 constantPoolHandle h_constants(thread, h_method->constants()); 384 bool should_repeat; 385 int handler_bci; 386 int current_bci = bci(thread); 387 388 // Need to do this check first since when _do_not_unlock_if_synchronized 389 // is set, we don't want to trigger any classloading which may make calls 390 // into java, or surprisingly find a matching exception handler for bci 0 391 // since at this moment the method hasn't been "officially" entered yet. 392 if (thread->do_not_unlock_if_synchronized()) { 393 ResourceMark rm; 394 assert(current_bci == 0, "bci isn't zero for do_not_unlock_if_synchronized"); 395 thread->set_vm_result(exception); 396 #ifdef CC_INTERP 397 return (address) -1; 398 #else 399 return Interpreter::remove_activation_entry(); 400 #endif 401 } 402 403 do { 404 should_repeat = false; 405 406 // assertions 407 #ifdef ASSERT 408 assert(h_exception.not_null(), "NULL exceptions should be handled by athrow"); 409 assert(h_exception->is_oop(), "just checking"); 410 // Check that exception is a subclass of Throwable, otherwise we have a VerifyError 411 if (!(h_exception->is_a(SystemDictionary::Throwable_klass()))) { 412 if (ExitVMOnVerifyError) vm_exit(-1); 413 ShouldNotReachHere(); 414 } 415 #endif 416 417 // tracing 418 if (TraceExceptions) { 419 ResourceMark rm(thread); 420 Symbol* message = java_lang_Throwable::detail_message(h_exception()); 421 ttyLocker ttyl; // Lock after getting the detail message 422 if (message != NULL) { 423 tty->print_cr("Exception <%s: %s> (" INTPTR_FORMAT ")", 424 h_exception->print_value_string(), message->as_C_string(), 425 (address)h_exception()); 426 } else { 427 tty->print_cr("Exception <%s> (" INTPTR_FORMAT ")", 428 h_exception->print_value_string(), 429 (address)h_exception()); 430 } 431 tty->print_cr(" thrown in interpreter method <%s>", h_method->print_value_string()); 432 tty->print_cr(" at bci %d for thread " INTPTR_FORMAT, current_bci, thread); 433 } 434 // Don't go paging in something which won't be used. 435 // else if (extable->length() == 0) { 436 // // disabled for now - interpreter is not using shortcut yet 437 // // (shortcut is not to call runtime if we have no exception handlers) 438 // // warning("performance bug: should not call runtime if method has no exception handlers"); 439 // } 440 // for AbortVMOnException flag 441 NOT_PRODUCT(Exceptions::debug_check_abort(h_exception)); 442 443 // exception handler lookup 444 KlassHandle h_klass(THREAD, h_exception->klass()); 445 handler_bci = Method::fast_exception_handler_bci_for(h_method, h_klass, current_bci, THREAD); 446 if (HAS_PENDING_EXCEPTION) { 447 // We threw an exception while trying to find the exception handler. 448 // Transfer the new exception to the exception handle which will 449 // be set into thread local storage, and do another lookup for an 450 // exception handler for this exception, this time starting at the 451 // BCI of the exception handler which caused the exception to be 452 // thrown (bug 4307310). 453 h_exception = Handle(THREAD, PENDING_EXCEPTION); 454 CLEAR_PENDING_EXCEPTION; 455 if (handler_bci >= 0) { 456 current_bci = handler_bci; 457 should_repeat = true; 458 } 459 } 460 } while (should_repeat == true); 461 462 // notify JVMTI of an exception throw; JVMTI will detect if this is a first 463 // time throw or a stack unwinding throw and accordingly notify the debugger 464 if (JvmtiExport::can_post_on_exceptions()) { 465 JvmtiExport::post_exception_throw(thread, h_method(), bcp(thread), h_exception()); 466 } 467 468 #ifdef CC_INTERP 469 address continuation = (address)(intptr_t) handler_bci; 470 #else 471 address continuation = NULL; 472 #endif 473 address handler_pc = NULL; 474 if (handler_bci < 0 || !thread->reguard_stack((address) &continuation)) { 475 // Forward exception to callee (leaving bci/bcp untouched) because (a) no 476 // handler in this method, or (b) after a stack overflow there is not yet 477 // enough stack space available to reprotect the stack. 478 #ifndef CC_INTERP 479 continuation = Interpreter::remove_activation_entry(); 480 #endif 481 // Count this for compilation purposes 482 h_method->interpreter_throwout_increment(THREAD); 483 } else { 484 // handler in this method => change bci/bcp to handler bci/bcp and continue there 485 handler_pc = h_method->code_base() + handler_bci; 486 #ifndef CC_INTERP 487 set_bcp_and_mdp(handler_pc, thread); 488 continuation = Interpreter::dispatch_table(vtos)[*handler_pc]; 489 #endif 490 } 491 // notify debugger of an exception catch 492 // (this is good for exceptions caught in native methods as well) 493 if (JvmtiExport::can_post_on_exceptions()) { 494 JvmtiExport::notice_unwind_due_to_exception(thread, h_method(), handler_pc, h_exception(), (handler_pc != NULL)); 495 } 496 497 thread->set_vm_result(h_exception()); 498 return continuation; 499 IRT_END 500 501 502 IRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* thread)) 503 assert(thread->has_pending_exception(), "must only ne called if there's an exception pending"); 504 // nothing to do - eventually we should remove this code entirely (see comments @ call sites) 505 IRT_END 506 507 508 IRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* thread)) 509 THROW(vmSymbols::java_lang_AbstractMethodError()); 510 IRT_END 511 512 513 IRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* thread)) 514 THROW(vmSymbols::java_lang_IncompatibleClassChangeError()); 515 IRT_END 516 517 518 //------------------------------------------------------------------------------------------------------------------------ 519 // Fields 520 // 521 522 IRT_ENTRY(void, InterpreterRuntime::resolve_get_put(JavaThread* thread, Bytecodes::Code bytecode)) 523 // resolve field 524 fieldDescriptor info; 525 constantPoolHandle pool(thread, method(thread)->constants()); 526 bool is_put = (bytecode == Bytecodes::_putfield || bytecode == Bytecodes::_putstatic); 527 bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic); 528 529 { 530 JvmtiHideSingleStepping jhss(thread); 531 LinkResolver::resolve_field_access(info, pool, get_index_u2_cpcache(thread, bytecode), 532 bytecode, CHECK); 533 } // end JvmtiHideSingleStepping 534 535 // check if link resolution caused cpCache to be updated 536 if (already_resolved(thread)) return; 537 538 // compute auxiliary field attributes 539 TosState state = as_TosState(info.field_type()); 540 541 // We need to delay resolving put instructions on final fields 542 // until we actually invoke one. This is required so we throw 543 // exceptions at the correct place. If we do not resolve completely 544 // in the current pass, leaving the put_code set to zero will 545 // cause the next put instruction to reresolve. 546 Bytecodes::Code put_code = (Bytecodes::Code)0; 547 548 // We also need to delay resolving getstatic instructions until the 549 // class is intitialized. This is required so that access to the static 550 // field will call the initialization function every time until the class 551 // is completely initialized ala. in 2.17.5 in JVM Specification. 552 InstanceKlass* klass = InstanceKlass::cast(info.field_holder()); 553 bool uninitialized_static = ((bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic) && 554 !klass->is_initialized()); 555 Bytecodes::Code get_code = (Bytecodes::Code)0; 556 557 if (!uninitialized_static) { 558 get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield); 559 if (is_put || !info.access_flags().is_final()) { 560 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield); 561 } 562 } 563 564 cache_entry(thread)->set_field( 565 get_code, 566 put_code, 567 info.field_holder(), 568 info.index(), 569 info.offset(), 570 state, 571 info.access_flags().is_final(), 572 info.access_flags().is_volatile(), 573 pool->pool_holder() 574 ); 575 IRT_END 576 577 578 //------------------------------------------------------------------------------------------------------------------------ 579 // Synchronization 580 // 581 // The interpreter's synchronization code is factored out so that it can 582 // be shared by method invocation and synchronized blocks. 583 //%note synchronization_3 584 585 //%note monitor_1 586 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* thread, BasicObjectLock* elem)) 587 #ifdef ASSERT 588 thread->last_frame().interpreter_frame_verify_monitor(elem); 589 #endif 590 if (PrintBiasedLockingStatistics) { 591 Atomic::inc(BiasedLocking::slow_path_entry_count_addr()); 592 } 593 Handle h_obj(thread, elem->obj()); 594 assert(Universe::heap()->is_in_reserved_or_null(h_obj()), 595 "must be NULL or an object"); 596 if (UseBiasedLocking) { 597 // Retry fast entry if bias is revoked to avoid unnecessary inflation 598 ObjectSynchronizer::fast_enter(h_obj, elem->lock(), true, CHECK); 599 } else { 600 ObjectSynchronizer::slow_enter(h_obj, elem->lock(), CHECK); 601 } 602 assert(Universe::heap()->is_in_reserved_or_null(elem->obj()), 603 "must be NULL or an object"); 604 #ifdef ASSERT 605 thread->last_frame().interpreter_frame_verify_monitor(elem); 606 #endif 607 IRT_END 608 609 610 //%note monitor_1 611 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorexit(JavaThread* thread, BasicObjectLock* elem)) 612 #ifdef ASSERT 613 thread->last_frame().interpreter_frame_verify_monitor(elem); 614 #endif 615 Handle h_obj(thread, elem->obj()); 616 assert(Universe::heap()->is_in_reserved_or_null(h_obj()), 617 "must be NULL or an object"); 618 if (elem == NULL || h_obj()->is_unlocked()) { 619 THROW(vmSymbols::java_lang_IllegalMonitorStateException()); 620 } 621 ObjectSynchronizer::slow_exit(h_obj(), elem->lock(), thread); 622 // Free entry. This must be done here, since a pending exception might be installed on 623 // exit. If it is not cleared, the exception handling code will try to unlock the monitor again. 624 elem->set_obj(NULL); 625 #ifdef ASSERT 626 thread->last_frame().interpreter_frame_verify_monitor(elem); 627 #endif 628 IRT_END 629 630 631 IRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* thread)) 632 THROW(vmSymbols::java_lang_IllegalMonitorStateException()); 633 IRT_END 634 635 636 IRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* thread)) 637 // Returns an illegal exception to install into the current thread. The 638 // pending_exception flag is cleared so normal exception handling does not 639 // trigger. Any current installed exception will be overwritten. This 640 // method will be called during an exception unwind. 641 642 assert(!HAS_PENDING_EXCEPTION, "no pending exception"); 643 Handle exception(thread, thread->vm_result()); 644 assert(exception() != NULL, "vm result should be set"); 645 thread->set_vm_result(NULL); // clear vm result before continuing (may cause memory leaks and assert failures) 646 if (!exception->is_a(SystemDictionary::ThreadDeath_klass())) { 647 exception = get_preinitialized_exception( 648 SystemDictionary::IllegalMonitorStateException_klass(), 649 CATCH); 650 } 651 thread->set_vm_result(exception()); 652 IRT_END 653 654 655 //------------------------------------------------------------------------------------------------------------------------ 656 // Invokes 657 658 IRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* thread, Method* method, address bcp)) 659 return method->orig_bytecode_at(method->bci_from(bcp)); 660 IRT_END 661 662 IRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* thread, Method* method, address bcp, Bytecodes::Code new_code)) 663 method->set_orig_bytecode_at(method->bci_from(bcp), new_code); 664 IRT_END 665 666 IRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* thread, Method* method, address bcp)) 667 JvmtiExport::post_raw_breakpoint(thread, method, bcp); 668 IRT_END 669 670 IRT_ENTRY(void, InterpreterRuntime::resolve_invoke(JavaThread* thread, Bytecodes::Code bytecode)) { 671 // extract receiver from the outgoing argument list if necessary 672 Handle receiver(thread, NULL); 673 if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface) { 674 ResourceMark rm(thread); 675 methodHandle m (thread, method(thread)); 676 Bytecode_invoke call(m, bci(thread)); 677 Symbol* signature = call.signature(); 678 receiver = Handle(thread, 679 thread->last_frame().interpreter_callee_receiver(signature)); 680 assert(Universe::heap()->is_in_reserved_or_null(receiver()), 681 "sanity check"); 682 assert(receiver.is_null() || 683 !Universe::heap()->is_in_reserved(receiver->klass()), 684 "sanity check"); 685 } 686 687 // resolve method 688 CallInfo info; 689 constantPoolHandle pool(thread, method(thread)->constants()); 690 691 { 692 JvmtiHideSingleStepping jhss(thread); 693 LinkResolver::resolve_invoke(info, receiver, pool, 694 get_index_u2_cpcache(thread, bytecode), bytecode, CHECK); 695 if (JvmtiExport::can_hotswap_or_post_breakpoint()) { 696 int retry_count = 0; 697 while (info.resolved_method()->is_old()) { 698 // It is very unlikely that method is redefined more than 100 times 699 // in the middle of resolve. If it is looping here more than 100 times 700 // means then there could be a bug here. 701 guarantee((retry_count++ < 100), 702 "Could not resolve to latest version of redefined method"); 703 // method is redefined in the middle of resolve so re-try. 704 LinkResolver::resolve_invoke(info, receiver, pool, 705 get_index_u2_cpcache(thread, bytecode), bytecode, CHECK); 706 } 707 } 708 } // end JvmtiHideSingleStepping 709 710 // check if link resolution caused cpCache to be updated 711 if (already_resolved(thread)) return; 712 713 if (bytecode == Bytecodes::_invokeinterface) { 714 if (TraceItables && Verbose) { 715 ResourceMark rm(thread); 716 tty->print_cr("Resolving: klass: %s to method: %s", info.resolved_klass()->name()->as_C_string(), info.resolved_method()->name()->as_C_string()); 717 } 718 } 719 #ifdef ASSERT 720 if (bytecode == Bytecodes::_invokeinterface) { 721 if (info.resolved_method()->method_holder() == 722 SystemDictionary::Object_klass()) { 723 // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec 724 // (see also CallInfo::set_interface for details) 725 assert(info.call_kind() == CallInfo::vtable_call || 726 info.call_kind() == CallInfo::direct_call, ""); 727 methodHandle rm = info.resolved_method(); 728 assert(rm->is_final() || info.has_vtable_index(), 729 "should have been set already"); 730 } else if (!info.resolved_method()->has_itable_index()) { 731 // Resolved something like CharSequence.toString. Use vtable not itable. 732 assert(info.call_kind() != CallInfo::itable_call, ""); 733 } else { 734 // Setup itable entry 735 assert(info.call_kind() == CallInfo::itable_call, ""); 736 int index = info.resolved_method()->itable_index(); 737 assert(info.itable_index() == index, ""); 738 } 739 } else { 740 assert(info.call_kind() == CallInfo::direct_call || 741 info.call_kind() == CallInfo::vtable_call, ""); 742 } 743 #endif 744 switch (info.call_kind()) { 745 case CallInfo::direct_call: 746 cache_entry(thread)->set_direct_call( 747 bytecode, 748 info.resolved_method()); 749 break; 750 case CallInfo::vtable_call: 751 cache_entry(thread)->set_vtable_call( 752 bytecode, 753 info.resolved_method(), 754 info.vtable_index()); 755 break; 756 case CallInfo::itable_call: 757 cache_entry(thread)->set_itable_call( 758 bytecode, 759 info.resolved_method(), 760 info.itable_index()); 761 break; 762 default: ShouldNotReachHere(); 763 } 764 } 765 IRT_END 766 767 768 // First time execution: Resolve symbols, create a permanent MethodType object. 769 IRT_ENTRY(void, InterpreterRuntime::resolve_invokehandle(JavaThread* thread)) { 770 const Bytecodes::Code bytecode = Bytecodes::_invokehandle; 771 772 // resolve method 773 CallInfo info; 774 constantPoolHandle pool(thread, method(thread)->constants()); 775 776 { 777 JvmtiHideSingleStepping jhss(thread); 778 LinkResolver::resolve_invoke(info, Handle(), pool, 779 get_index_u2_cpcache(thread, bytecode), bytecode, CHECK); 780 } // end JvmtiHideSingleStepping 781 782 cache_entry(thread)->set_method_handle(pool, info); 783 } 784 IRT_END 785 786 787 // First time execution: Resolve symbols, create a permanent CallSite object. 788 IRT_ENTRY(void, InterpreterRuntime::resolve_invokedynamic(JavaThread* thread)) { 789 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic; 790 791 //TO DO: consider passing BCI to Java. 792 // int caller_bci = method(thread)->bci_from(bcp(thread)); 793 794 // resolve method 795 CallInfo info; 796 constantPoolHandle pool(thread, method(thread)->constants()); 797 int index = get_index_u4(thread, bytecode); 798 { 799 JvmtiHideSingleStepping jhss(thread); 800 LinkResolver::resolve_invoke(info, Handle(), pool, 801 index, bytecode, CHECK); 802 } // end JvmtiHideSingleStepping 803 804 ConstantPoolCacheEntry* cp_cache_entry = pool->invokedynamic_cp_cache_entry_at(index); 805 cp_cache_entry->set_dynamic_call(pool, info); 806 } 807 IRT_END 808 809 810 //------------------------------------------------------------------------------------------------------------------------ 811 // Miscellaneous 812 813 814 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* thread, address branch_bcp) { 815 nmethod* nm = frequency_counter_overflow_inner(thread, branch_bcp); 816 assert(branch_bcp != NULL || nm == NULL, "always returns null for non OSR requests"); 817 if (branch_bcp != NULL && nm != NULL) { 818 // This was a successful request for an OSR nmethod. Because 819 // frequency_counter_overflow_inner ends with a safepoint check, 820 // nm could have been unloaded so look it up again. It's unsafe 821 // to examine nm directly since it might have been freed and used 822 // for something else. 823 frame fr = thread->last_frame(); 824 Method* method = fr.interpreter_frame_method(); 825 int bci = method->bci_from(fr.interpreter_frame_bcp()); 826 nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false); 827 } 828 #ifndef PRODUCT 829 if (TraceOnStackReplacement) { 830 if (nm != NULL) { 831 tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", nm->osr_entry()); 832 nm->print(); 833 } 834 } 835 #endif 836 return nm; 837 } 838 839 IRT_ENTRY(nmethod*, 840 InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* thread, address branch_bcp)) 841 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized 842 // flag, in case this method triggers classloading which will call into Java. 843 UnlockFlagSaver fs(thread); 844 845 frame fr = thread->last_frame(); 846 assert(fr.is_interpreted_frame(), "must come from interpreter"); 847 methodHandle method(thread, fr.interpreter_frame_method()); 848 const int branch_bci = branch_bcp != NULL ? method->bci_from(branch_bcp) : InvocationEntryBci; 849 const int bci = branch_bcp != NULL ? method->bci_from(fr.interpreter_frame_bcp()) : InvocationEntryBci; 850 851 assert(!HAS_PENDING_EXCEPTION, "Should not have any exceptions pending"); 852 nmethod* osr_nm = CompilationPolicy::policy()->event(method, method, branch_bci, bci, CompLevel_none, NULL, thread); 853 assert(!HAS_PENDING_EXCEPTION, "Event handler should not throw any exceptions"); 854 855 if (osr_nm != NULL) { 856 // We may need to do on-stack replacement which requires that no 857 // monitors in the activation are biased because their 858 // BasicObjectLocks will need to migrate during OSR. Force 859 // unbiasing of all monitors in the activation now (even though 860 // the OSR nmethod might be invalidated) because we don't have a 861 // safepoint opportunity later once the migration begins. 862 if (UseBiasedLocking) { 863 ResourceMark rm; 864 GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>(); 865 for( BasicObjectLock *kptr = fr.interpreter_frame_monitor_end(); 866 kptr < fr.interpreter_frame_monitor_begin(); 867 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) { 868 if( kptr->obj() != NULL ) { 869 objects_to_revoke->append(Handle(THREAD, kptr->obj())); 870 } 871 } 872 BiasedLocking::revoke(objects_to_revoke); 873 } 874 } 875 return osr_nm; 876 IRT_END 877 878 IRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp)) 879 assert(ProfileInterpreter, "must be profiling interpreter"); 880 int bci = method->bci_from(cur_bcp); 881 MethodData* mdo = method->method_data(); 882 if (mdo == NULL) return 0; 883 return mdo->bci_to_di(bci); 884 IRT_END 885 886 IRT_ENTRY(void, InterpreterRuntime::profile_method(JavaThread* thread)) 887 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized 888 // flag, in case this method triggers classloading which will call into Java. 889 UnlockFlagSaver fs(thread); 890 891 assert(ProfileInterpreter, "must be profiling interpreter"); 892 frame fr = thread->last_frame(); 893 assert(fr.is_interpreted_frame(), "must come from interpreter"); 894 methodHandle method(thread, fr.interpreter_frame_method()); 895 Method::build_interpreter_method_data(method, THREAD); 896 if (HAS_PENDING_EXCEPTION) { 897 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here"); 898 CLEAR_PENDING_EXCEPTION; 899 // and fall through... 900 } 901 IRT_END 902 903 904 #ifdef ASSERT 905 IRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp)) 906 assert(ProfileInterpreter, "must be profiling interpreter"); 907 908 MethodData* mdo = method->method_data(); 909 assert(mdo != NULL, "must not be null"); 910 911 int bci = method->bci_from(bcp); 912 913 address mdp2 = mdo->bci_to_dp(bci); 914 if (mdp != mdp2) { 915 ResourceMark rm; 916 ResetNoHandleMark rnm; // In a LEAF entry. 917 HandleMark hm; 918 tty->print_cr("FAILED verify : actual mdp %p expected mdp %p @ bci %d", mdp, mdp2, bci); 919 int current_di = mdo->dp_to_di(mdp); 920 int expected_di = mdo->dp_to_di(mdp2); 921 tty->print_cr(" actual di %d expected di %d", current_di, expected_di); 922 int expected_approx_bci = mdo->data_at(expected_di)->bci(); 923 int approx_bci = -1; 924 if (current_di >= 0) { 925 approx_bci = mdo->data_at(current_di)->bci(); 926 } 927 tty->print_cr(" actual bci is %d expected bci %d", approx_bci, expected_approx_bci); 928 mdo->print_on(tty); 929 method->print_codes(); 930 } 931 assert(mdp == mdp2, "wrong mdp"); 932 IRT_END 933 #endif // ASSERT 934 935 IRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* thread, int return_bci)) 936 assert(ProfileInterpreter, "must be profiling interpreter"); 937 ResourceMark rm(thread); 938 HandleMark hm(thread); 939 frame fr = thread->last_frame(); 940 assert(fr.is_interpreted_frame(), "must come from interpreter"); 941 MethodData* h_mdo = fr.interpreter_frame_method()->method_data(); 942 943 // Grab a lock to ensure atomic access to setting the return bci and 944 // the displacement. This can block and GC, invalidating all naked oops. 945 MutexLocker ml(RetData_lock); 946 947 // ProfileData is essentially a wrapper around a derived oop, so we 948 // need to take the lock before making any ProfileData structures. 949 ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(fr.interpreter_frame_mdp())); 950 RetData* rdata = data->as_RetData(); 951 address new_mdp = rdata->fixup_ret(return_bci, h_mdo); 952 fr.interpreter_frame_set_mdp(new_mdp); 953 IRT_END 954 955 IRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* thread, Method* m)) 956 MethodCounters* mcs = Method::build_method_counters(m, thread); 957 if (HAS_PENDING_EXCEPTION) { 958 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here"); 959 CLEAR_PENDING_EXCEPTION; 960 } 961 return mcs; 962 IRT_END 963 964 965 IRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* thread)) 966 // We used to need an explict preserve_arguments here for invoke bytecodes. However, 967 // stack traversal automatically takes care of preserving arguments for invoke, so 968 // this is no longer needed. 969 970 // IRT_END does an implicit safepoint check, hence we are guaranteed to block 971 // if this is called during a safepoint 972 973 if (JvmtiExport::should_post_single_step()) { 974 // We are called during regular safepoints and when the VM is 975 // single stepping. If any thread is marked for single stepping, 976 // then we may have JVMTI work to do. 977 JvmtiExport::at_single_stepping_point(thread, method(thread), bcp(thread)); 978 } 979 IRT_END 980 981 IRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread *thread, oopDesc* obj, 982 ConstantPoolCacheEntry *cp_entry)) 983 984 // check the access_flags for the field in the klass 985 986 InstanceKlass* ik = InstanceKlass::cast(cp_entry->f1_as_klass()); 987 int index = cp_entry->field_index(); 988 if ((ik->field_access_flags(index) & JVM_ACC_FIELD_ACCESS_WATCHED) == 0) return; 989 990 bool is_static = (obj == NULL); 991 HandleMark hm(thread); 992 993 Handle h_obj; 994 if (!is_static) { 995 // non-static field accessors have an object, but we need a handle 996 h_obj = Handle(thread, obj); 997 } 998 instanceKlassHandle h_cp_entry_f1(thread, (Klass*)cp_entry->f1_as_klass()); 999 jfieldID fid = jfieldIDWorkaround::to_jfieldID(h_cp_entry_f1, cp_entry->f2_as_index(), is_static); 1000 JvmtiExport::post_field_access(thread, method(thread), bcp(thread), h_cp_entry_f1, h_obj, fid); 1001 IRT_END 1002 1003 IRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread *thread, 1004 oopDesc* obj, ConstantPoolCacheEntry *cp_entry, jvalue *value)) 1005 1006 Klass* k = (Klass*)cp_entry->f1_as_klass(); 1007 1008 // check the access_flags for the field in the klass 1009 InstanceKlass* ik = InstanceKlass::cast(k); 1010 int index = cp_entry->field_index(); 1011 // bail out if field modifications are not watched 1012 if ((ik->field_access_flags(index) & JVM_ACC_FIELD_MODIFICATION_WATCHED) == 0) return; 1013 1014 char sig_type = '\0'; 1015 1016 switch(cp_entry->flag_state()) { 1017 case btos: sig_type = 'Z'; break; 1018 case ctos: sig_type = 'C'; break; 1019 case stos: sig_type = 'S'; break; 1020 case itos: sig_type = 'I'; break; 1021 case ftos: sig_type = 'F'; break; 1022 case atos: sig_type = 'L'; break; 1023 case ltos: sig_type = 'J'; break; 1024 case dtos: sig_type = 'D'; break; 1025 default: ShouldNotReachHere(); return; 1026 } 1027 bool is_static = (obj == NULL); 1028 1029 HandleMark hm(thread); 1030 instanceKlassHandle h_klass(thread, k); 1031 jfieldID fid = jfieldIDWorkaround::to_jfieldID(h_klass, cp_entry->f2_as_index(), is_static); 1032 jvalue fvalue; 1033 #ifdef _LP64 1034 fvalue = *value; 1035 #else 1036 // Long/double values are stored unaligned and also noncontiguously with 1037 // tagged stacks. We can't just do a simple assignment even in the non- 1038 // J/D cases because a C++ compiler is allowed to assume that a jvalue is 1039 // 8-byte aligned, and interpreter stack slots are only 4-byte aligned. 1040 // We assume that the two halves of longs/doubles are stored in interpreter 1041 // stack slots in platform-endian order. 1042 jlong_accessor u; 1043 jint* newval = (jint*)value; 1044 u.words[0] = newval[0]; 1045 u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag 1046 fvalue.j = u.long_value; 1047 #endif // _LP64 1048 1049 Handle h_obj; 1050 if (!is_static) { 1051 // non-static field accessors have an object, but we need a handle 1052 h_obj = Handle(thread, obj); 1053 } 1054 1055 JvmtiExport::post_raw_field_modification(thread, method(thread), bcp(thread), h_klass, h_obj, 1056 fid, sig_type, &fvalue); 1057 IRT_END 1058 1059 IRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread *thread)) 1060 JvmtiExport::post_method_entry(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread)); 1061 IRT_END 1062 1063 1064 IRT_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread *thread)) 1065 JvmtiExport::post_method_exit(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread)); 1066 IRT_END 1067 1068 IRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc)) 1069 { 1070 return (Interpreter::contains(pc) ? 1 : 0); 1071 } 1072 IRT_END 1073 1074 1075 // Implementation of SignatureHandlerLibrary 1076 1077 address SignatureHandlerLibrary::set_handler_blob() { 1078 BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size); 1079 if (handler_blob == NULL) { 1080 CompileBroker::handle_full_code_cache(CodeBlobType::NonMethod); 1081 return NULL; 1082 } 1083 address handler = handler_blob->code_begin(); 1084 _handler_blob = handler_blob; 1085 _handler = handler; 1086 return handler; 1087 } 1088 1089 void SignatureHandlerLibrary::initialize() { 1090 if (_fingerprints != NULL) { 1091 return; 1092 } 1093 if (set_handler_blob() == NULL) { 1094 vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers"); 1095 } 1096 1097 BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer", 1098 SignatureHandlerLibrary::buffer_size); 1099 _buffer = bb->code_begin(); 1100 1101 _fingerprints = new(ResourceObj::C_HEAP, mtCode)GrowableArray<uint64_t>(32, true); 1102 _handlers = new(ResourceObj::C_HEAP, mtCode)GrowableArray<address>(32, true); 1103 } 1104 1105 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) { 1106 address handler = _handler; 1107 int insts_size = buffer->pure_insts_size(); 1108 if (handler + insts_size > _handler_blob->code_end()) { 1109 // get a new handler blob 1110 handler = set_handler_blob(); 1111 } 1112 if (handler != NULL) { 1113 memcpy(handler, buffer->insts_begin(), insts_size); 1114 pd_set_handler(handler); 1115 ICache::invalidate_range(handler, insts_size); 1116 _handler = handler + insts_size; 1117 } 1118 return handler; 1119 } 1120 1121 void SignatureHandlerLibrary::add(methodHandle method) { 1122 if (method->signature_handler() == NULL) { 1123 // use slow signature handler if we can't do better 1124 int handler_index = -1; 1125 // check if we can use customized (fast) signature handler 1126 if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::max_size_of_parameters) { 1127 // use customized signature handler 1128 MutexLocker mu(SignatureHandlerLibrary_lock); 1129 // make sure data structure is initialized 1130 initialize(); 1131 // lookup method signature's fingerprint 1132 uint64_t fingerprint = Fingerprinter(method).fingerprint(); 1133 handler_index = _fingerprints->find(fingerprint); 1134 // create handler if necessary 1135 if (handler_index < 0) { 1136 ResourceMark rm; 1137 ptrdiff_t align_offset = (address) 1138 round_to((intptr_t)_buffer, CodeEntryAlignment) - (address)_buffer; 1139 CodeBuffer buffer((address)(_buffer + align_offset), 1140 SignatureHandlerLibrary::buffer_size - align_offset); 1141 InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint); 1142 // copy into code heap 1143 address handler = set_handler(&buffer); 1144 if (handler == NULL) { 1145 // use slow signature handler 1146 } else { 1147 // debugging suppport 1148 if (PrintSignatureHandlers) { 1149 tty->cr(); 1150 tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)", 1151 _handlers->length(), 1152 (method->is_static() ? "static" : "receiver"), 1153 method->name_and_sig_as_C_string(), 1154 fingerprint, 1155 buffer.insts_size()); 1156 Disassembler::decode(handler, handler + buffer.insts_size()); 1157 #ifndef PRODUCT 1158 tty->print_cr(" --- associated result handler ---"); 1159 address rh_begin = Interpreter::result_handler(method()->result_type()); 1160 address rh_end = rh_begin; 1161 while (*(int*)rh_end != 0) { 1162 rh_end += sizeof(int); 1163 } 1164 Disassembler::decode(rh_begin, rh_end); 1165 #endif 1166 } 1167 // add handler to library 1168 _fingerprints->append(fingerprint); 1169 _handlers->append(handler); 1170 // set handler index 1171 assert(_fingerprints->length() == _handlers->length(), "sanity check"); 1172 handler_index = _fingerprints->length() - 1; 1173 } 1174 } 1175 // Set handler under SignatureHandlerLibrary_lock 1176 if (handler_index < 0) { 1177 // use generic signature handler 1178 method->set_signature_handler(Interpreter::slow_signature_handler()); 1179 } else { 1180 // set handler 1181 method->set_signature_handler(_handlers->at(handler_index)); 1182 } 1183 } else { 1184 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 1185 // use generic signature handler 1186 method->set_signature_handler(Interpreter::slow_signature_handler()); 1187 } 1188 } 1189 #ifdef ASSERT 1190 int handler_index = -1; 1191 int fingerprint_index = -2; 1192 { 1193 // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized 1194 // in any way if accessed from multiple threads. To avoid races with another 1195 // thread which may change the arrays in the above, mutex protected block, we 1196 // have to protect this read access here with the same mutex as well! 1197 MutexLocker mu(SignatureHandlerLibrary_lock); 1198 if (_handlers != NULL) { 1199 handler_index = _handlers->find(method->signature_handler()); 1200 fingerprint_index = _fingerprints->find(Fingerprinter(method).fingerprint()); 1201 } 1202 } 1203 assert(method->signature_handler() == Interpreter::slow_signature_handler() || 1204 handler_index == fingerprint_index, "sanity check"); 1205 #endif // ASSERT 1206 } 1207 1208 1209 BufferBlob* SignatureHandlerLibrary::_handler_blob = NULL; 1210 address SignatureHandlerLibrary::_handler = NULL; 1211 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = NULL; 1212 GrowableArray<address>* SignatureHandlerLibrary::_handlers = NULL; 1213 address SignatureHandlerLibrary::_buffer = NULL; 1214 1215 1216 IRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* thread, Method* method)) 1217 methodHandle m(thread, method); 1218 assert(m->is_native(), "sanity check"); 1219 // lookup native function entry point if it doesn't exist 1220 bool in_base_library; 1221 if (!m->has_native_function()) { 1222 NativeLookup::lookup(m, in_base_library, CHECK); 1223 } 1224 // make sure signature handler is installed 1225 SignatureHandlerLibrary::add(m); 1226 // The interpreter entry point checks the signature handler first, 1227 // before trying to fetch the native entry point and klass mirror. 1228 // We must set the signature handler last, so that multiple processors 1229 // preparing the same method will be sure to see non-null entry & mirror. 1230 IRT_END 1231 1232 #if defined(IA32) || defined(AMD64) || defined(ARM) 1233 IRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* thread, void* src_address, void* dest_address)) 1234 if (src_address == dest_address) { 1235 return; 1236 } 1237 ResetNoHandleMark rnm; // In a LEAF entry. 1238 HandleMark hm; 1239 ResourceMark rm; 1240 frame fr = thread->last_frame(); 1241 assert(fr.is_interpreted_frame(), ""); 1242 jint bci = fr.interpreter_frame_bci(); 1243 methodHandle mh(thread, fr.interpreter_frame_method()); 1244 Bytecode_invoke invoke(mh, bci); 1245 ArgumentSizeComputer asc(invoke.signature()); 1246 int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver 1247 Copy::conjoint_jbytes(src_address, dest_address, 1248 size_of_arguments * Interpreter::stackElementSize); 1249 IRT_END 1250 #endif 1251 1252 #if INCLUDE_JVMTI 1253 // This is a support of the JVMTI PopFrame interface. 1254 // Make sure it is an invokestatic of a polymorphic intrinsic that has a member_name argument 1255 // and return it as a vm_result so that it can be reloaded in the list of invokestatic parameters. 1256 // The member_name argument is a saved reference (in local#0) to the member_name. 1257 // For backward compatibility with some JDK versions (7, 8) it can also be a direct method handle. 1258 // FIXME: remove DMH case after j.l.i.InvokerBytecodeGenerator code shape is updated. 1259 IRT_ENTRY(void, InterpreterRuntime::member_name_arg_or_null(JavaThread* thread, address member_name, 1260 Method* method, address bcp)) 1261 Bytecodes::Code code = Bytecodes::code_at(method, bcp); 1262 if (code != Bytecodes::_invokestatic) { 1263 return; 1264 } 1265 ConstantPool* cpool = method->constants(); 1266 int cp_index = Bytes::get_native_u2(bcp + 1) + ConstantPool::CPCACHE_INDEX_TAG; 1267 Symbol* cname = cpool->klass_name_at(cpool->klass_ref_index_at(cp_index)); 1268 Symbol* mname = cpool->name_ref_at(cp_index); 1269 1270 if (MethodHandles::has_member_arg(cname, mname)) { 1271 oop member_name_oop = (oop) member_name; 1272 if (java_lang_invoke_DirectMethodHandle::is_instance(member_name_oop)) { 1273 // FIXME: remove after j.l.i.InvokerBytecodeGenerator code shape is updated. 1274 member_name_oop = java_lang_invoke_DirectMethodHandle::member(member_name_oop); 1275 } 1276 thread->set_vm_result(member_name_oop); 1277 } 1278 IRT_END 1279 #endif // INCLUDE_JVMTI