1 /* 2 * Copyright (c) 1997, 2023, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/javaClasses.inline.hpp" 27 #include "classfile/symbolTable.hpp" 28 #include "classfile/vmClasses.hpp" 29 #include "classfile/vmSymbols.hpp" 30 #include "code/codeCache.hpp" 31 #include "compiler/compilationPolicy.hpp" 32 #include "compiler/compileBroker.hpp" 33 #include "compiler/disassembler.hpp" 34 #include "gc/shared/barrierSetNMethod.hpp" 35 #include "gc/shared/collectedHeap.hpp" 36 #include "interpreter/bytecodeTracer.hpp" 37 #include "interpreter/interpreter.hpp" 38 #include "interpreter/interpreterRuntime.hpp" 39 #include "interpreter/linkResolver.hpp" 40 #include "interpreter/templateTable.hpp" 41 #include "jvm_io.h" 42 #include "logging/log.hpp" 43 #include "memory/oopFactory.hpp" 44 #include "memory/resourceArea.hpp" 45 #include "memory/universe.hpp" 46 #include "oops/constantPool.inline.hpp" 47 #include "oops/cpCache.inline.hpp" 48 #include "oops/instanceKlass.inline.hpp" 49 #include "oops/klass.inline.hpp" 50 #include "oops/methodData.hpp" 51 #include "oops/method.inline.hpp" 52 #include "oops/objArrayKlass.hpp" 53 #include "oops/objArrayOop.inline.hpp" 54 #include "oops/oop.inline.hpp" 55 #include "oops/symbol.hpp" 56 #include "prims/jvmtiExport.hpp" 57 #include "prims/methodHandles.hpp" 58 #include "prims/nativeLookup.hpp" 59 #include "runtime/atomic.hpp" 60 #include "runtime/continuation.hpp" 61 #include "runtime/deoptimization.hpp" 62 #include "runtime/fieldDescriptor.inline.hpp" 63 #include "runtime/frame.inline.hpp" 64 #include "runtime/handles.inline.hpp" 65 #include "runtime/icache.hpp" 66 #include "runtime/interfaceSupport.inline.hpp" 67 #include "runtime/java.hpp" 68 #include "runtime/javaCalls.hpp" 69 #include "runtime/jfieldIDWorkaround.hpp" 70 #include "runtime/osThread.hpp" 71 #include "runtime/sharedRuntime.hpp" 72 #include "runtime/stackWatermarkSet.hpp" 73 #include "runtime/stubRoutines.hpp" 74 #include "runtime/synchronizer.hpp" 75 #include "runtime/threadCritical.hpp" 76 #include "utilities/align.hpp" 77 #include "utilities/checkedCast.hpp" 78 #include "utilities/copy.hpp" 79 #include "utilities/events.hpp" 80 #ifdef COMPILER2 81 #include "opto/runtime.hpp" 82 #endif 83 84 // Helper class to access current interpreter state 85 class LastFrameAccessor : public StackObj { 86 frame _last_frame; 87 public: 88 LastFrameAccessor(JavaThread* current) { 89 assert(current == Thread::current(), "sanity"); 90 _last_frame = current->last_frame(); 91 } 92 bool is_interpreted_frame() const { return _last_frame.is_interpreted_frame(); } 93 Method* method() const { return _last_frame.interpreter_frame_method(); } 94 address bcp() const { return _last_frame.interpreter_frame_bcp(); } 95 int bci() const { return _last_frame.interpreter_frame_bci(); } 96 address mdp() const { return _last_frame.interpreter_frame_mdp(); } 97 98 void set_bcp(address bcp) { _last_frame.interpreter_frame_set_bcp(bcp); } 99 void set_mdp(address dp) { _last_frame.interpreter_frame_set_mdp(dp); } 100 101 // pass method to avoid calling unsafe bcp_to_method (partial fix 4926272) 102 Bytecodes::Code code() const { return Bytecodes::code_at(method(), bcp()); } 103 104 Bytecode bytecode() const { return Bytecode(method(), bcp()); } 105 int get_index_u1(Bytecodes::Code bc) const { return bytecode().get_index_u1(bc); } 106 int get_index_u2(Bytecodes::Code bc) const { return bytecode().get_index_u2(bc); } 107 int get_index_u4(Bytecodes::Code bc) const { return bytecode().get_index_u4(bc); } 108 int number_of_dimensions() const { return bcp()[3]; } 109 110 oop callee_receiver(Symbol* signature) { 111 return _last_frame.interpreter_callee_receiver(signature); 112 } 113 BasicObjectLock* monitor_begin() const { 114 return _last_frame.interpreter_frame_monitor_begin(); 115 } 116 BasicObjectLock* monitor_end() const { 117 return _last_frame.interpreter_frame_monitor_end(); 118 } 119 BasicObjectLock* next_monitor(BasicObjectLock* current) const { 120 return _last_frame.next_monitor_in_interpreter_frame(current); 121 } 122 123 frame& get_frame() { return _last_frame; } 124 }; 125 126 //------------------------------------------------------------------------------------------------------------------------ 127 // State accessors 128 129 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread* current) { 130 LastFrameAccessor last_frame(current); 131 last_frame.set_bcp(bcp); 132 if (ProfileInterpreter) { 133 // ProfileTraps uses MDOs independently of ProfileInterpreter. 134 // That is why we must check both ProfileInterpreter and mdo != nullptr. 135 MethodData* mdo = last_frame.method()->method_data(); 136 if (mdo != nullptr) { 137 NEEDS_CLEANUP; 138 last_frame.set_mdp(mdo->bci_to_dp(last_frame.bci())); 139 } 140 } 141 } 142 143 //------------------------------------------------------------------------------------------------------------------------ 144 // Constants 145 146 147 JRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* current, bool wide)) 148 // access constant pool 149 LastFrameAccessor last_frame(current); 150 ConstantPool* pool = last_frame.method()->constants(); 151 int cp_index = wide ? last_frame.get_index_u2(Bytecodes::_ldc_w) : last_frame.get_index_u1(Bytecodes::_ldc); 152 constantTag tag = pool->tag_at(cp_index); 153 154 assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call"); 155 Klass* klass = pool->klass_at(cp_index, CHECK); 156 oop java_class = klass->java_mirror(); 157 current->set_vm_result(java_class); 158 JRT_END 159 160 JRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* current, Bytecodes::Code bytecode)) { 161 assert(bytecode == Bytecodes::_ldc || 162 bytecode == Bytecodes::_ldc_w || 163 bytecode == Bytecodes::_ldc2_w || 164 bytecode == Bytecodes::_fast_aldc || 165 bytecode == Bytecodes::_fast_aldc_w, "wrong bc"); 166 ResourceMark rm(current); 167 const bool is_fast_aldc = (bytecode == Bytecodes::_fast_aldc || 168 bytecode == Bytecodes::_fast_aldc_w); 169 LastFrameAccessor last_frame(current); 170 methodHandle m (current, last_frame.method()); 171 Bytecode_loadconstant ldc(m, last_frame.bci()); 172 173 // Double-check the size. (Condy can have any type.) 174 BasicType type = ldc.result_type(); 175 switch (type2size[type]) { 176 case 2: guarantee(bytecode == Bytecodes::_ldc2_w, ""); break; 177 case 1: guarantee(bytecode != Bytecodes::_ldc2_w, ""); break; 178 default: ShouldNotReachHere(); 179 } 180 181 // Resolve the constant. This does not do unboxing. 182 // But it does replace Universe::the_null_sentinel by null. 183 oop result = ldc.resolve_constant(CHECK); 184 assert(result != nullptr || is_fast_aldc, "null result only valid for fast_aldc"); 185 186 #ifdef ASSERT 187 { 188 // The bytecode wrappers aren't GC-safe so construct a new one 189 Bytecode_loadconstant ldc2(m, last_frame.bci()); 190 int rindex = ldc2.cache_index(); 191 if (rindex < 0) 192 rindex = m->constants()->cp_to_object_index(ldc2.pool_index()); 193 if (rindex >= 0) { 194 oop coop = m->constants()->resolved_reference_at(rindex); 195 oop roop = (result == nullptr ? Universe::the_null_sentinel() : result); 196 assert(roop == coop, "expected result for assembly code"); 197 } 198 } 199 #endif 200 current->set_vm_result(result); 201 if (!is_fast_aldc) { 202 // Tell the interpreter how to unbox the primitive. 203 guarantee(java_lang_boxing_object::is_instance(result, type), ""); 204 int offset = java_lang_boxing_object::value_offset(type); 205 intptr_t flags = ((as_TosState(type) << ConstantPoolCache::tos_state_shift) 206 | (offset & ConstantPoolCache::field_index_mask)); 207 current->set_vm_result_2((Metadata*)flags); 208 } 209 } 210 JRT_END 211 212 213 //------------------------------------------------------------------------------------------------------------------------ 214 // Allocation 215 216 JRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* current, ConstantPool* pool, int index)) 217 Klass* k = pool->klass_at(index, CHECK); 218 InstanceKlass* klass = InstanceKlass::cast(k); 219 220 // Make sure we are not instantiating an abstract klass 221 klass->check_valid_for_instantiation(true, CHECK); 222 223 // Make sure klass is initialized 224 klass->initialize(CHECK); 225 226 // At this point the class may not be fully initialized 227 // because of recursive initialization. If it is fully 228 // initialized & has_finalized is not set, we rewrite 229 // it into its fast version (Note: no locking is needed 230 // here since this is an atomic byte write and can be 231 // done more than once). 232 // 233 // Note: In case of classes with has_finalized we don't 234 // rewrite since that saves us an extra check in 235 // the fast version which then would call the 236 // slow version anyway (and do a call back into 237 // Java). 238 // If we have a breakpoint, then we don't rewrite 239 // because the _breakpoint bytecode would be lost. 240 oop obj = klass->allocate_instance(CHECK); 241 current->set_vm_result(obj); 242 JRT_END 243 244 245 JRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* current, BasicType type, jint size)) 246 oop obj = oopFactory::new_typeArray(type, size, CHECK); 247 current->set_vm_result(obj); 248 JRT_END 249 250 251 JRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* current, ConstantPool* pool, int index, jint size)) 252 Klass* klass = pool->klass_at(index, CHECK); 253 objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK); 254 current->set_vm_result(obj); 255 JRT_END 256 257 258 JRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* current, jint* first_size_address)) 259 // We may want to pass in more arguments - could make this slightly faster 260 LastFrameAccessor last_frame(current); 261 ConstantPool* constants = last_frame.method()->constants(); 262 int i = last_frame.get_index_u2(Bytecodes::_multianewarray); 263 Klass* klass = constants->klass_at(i, CHECK); 264 int nof_dims = last_frame.number_of_dimensions(); 265 assert(klass->is_klass(), "not a class"); 266 assert(nof_dims >= 1, "multianewarray rank must be nonzero"); 267 268 // We must create an array of jints to pass to multi_allocate. 269 ResourceMark rm(current); 270 const int small_dims = 10; 271 jint dim_array[small_dims]; 272 jint *dims = &dim_array[0]; 273 if (nof_dims > small_dims) { 274 dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims); 275 } 276 for (int index = 0; index < nof_dims; index++) { 277 // offset from first_size_address is addressed as local[index] 278 int n = Interpreter::local_offset_in_bytes(index)/jintSize; 279 dims[index] = first_size_address[n]; 280 } 281 oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK); 282 current->set_vm_result(obj); 283 JRT_END 284 285 286 JRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* current, oopDesc* obj)) 287 assert(oopDesc::is_oop(obj), "must be a valid oop"); 288 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise"); 289 InstanceKlass::register_finalizer(instanceOop(obj), CHECK); 290 JRT_END 291 292 293 // Quicken instance-of and check-cast bytecodes 294 JRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* current)) 295 // Force resolving; quicken the bytecode 296 LastFrameAccessor last_frame(current); 297 int which = last_frame.get_index_u2(Bytecodes::_checkcast); 298 ConstantPool* cpool = last_frame.method()->constants(); 299 // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded 300 // program we might have seen an unquick'd bytecode in the interpreter but have another 301 // thread quicken the bytecode before we get here. 302 // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" ); 303 Klass* klass = cpool->klass_at(which, CHECK); 304 current->set_vm_result_2(klass); 305 JRT_END 306 307 308 //------------------------------------------------------------------------------------------------------------------------ 309 // Exceptions 310 311 void InterpreterRuntime::note_trap_inner(JavaThread* current, int reason, 312 const methodHandle& trap_method, int trap_bci) { 313 if (trap_method.not_null()) { 314 MethodData* trap_mdo = trap_method->method_data(); 315 if (trap_mdo == nullptr) { 316 ExceptionMark em(current); 317 JavaThread* THREAD = current; // For exception macros. 318 Method::build_profiling_method_data(trap_method, THREAD); 319 if (HAS_PENDING_EXCEPTION) { 320 // Only metaspace OOM is expected. No Java code executed. 321 assert((PENDING_EXCEPTION->is_a(vmClasses::OutOfMemoryError_klass())), 322 "we expect only an OOM error here"); 323 CLEAR_PENDING_EXCEPTION; 324 } 325 trap_mdo = trap_method->method_data(); 326 // and fall through... 327 } 328 if (trap_mdo != nullptr) { 329 // Update per-method count of trap events. The interpreter 330 // is updating the MDO to simulate the effect of compiler traps. 331 Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason); 332 } 333 } 334 } 335 336 // Assume the compiler is (or will be) interested in this event. 337 // If necessary, create an MDO to hold the information, and record it. 338 void InterpreterRuntime::note_trap(JavaThread* current, int reason) { 339 assert(ProfileTraps, "call me only if profiling"); 340 LastFrameAccessor last_frame(current); 341 methodHandle trap_method(current, last_frame.method()); 342 int trap_bci = trap_method->bci_from(last_frame.bcp()); 343 note_trap_inner(current, reason, trap_method, trap_bci); 344 } 345 346 static Handle get_preinitialized_exception(Klass* k, TRAPS) { 347 // get klass 348 InstanceKlass* klass = InstanceKlass::cast(k); 349 assert(klass->is_initialized(), 350 "this klass should have been initialized during VM initialization"); 351 // create instance - do not call constructor since we may have no 352 // (java) stack space left (should assert constructor is empty) 353 Handle exception; 354 oop exception_oop = klass->allocate_instance(CHECK_(exception)); 355 exception = Handle(THREAD, exception_oop); 356 if (StackTraceInThrowable) { 357 java_lang_Throwable::fill_in_stack_trace(exception); 358 } 359 return exception; 360 } 361 362 // Special handling for stack overflow: since we don't have any (java) stack 363 // space left we use the pre-allocated & pre-initialized StackOverflowError 364 // klass to create an stack overflow error instance. We do not call its 365 // constructor for the same reason (it is empty, anyway). 366 JRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* current)) 367 Handle exception = get_preinitialized_exception( 368 vmClasses::StackOverflowError_klass(), 369 CHECK); 370 // Increment counter for hs_err file reporting 371 Atomic::inc(&Exceptions::_stack_overflow_errors); 372 // Remove the ScopedValue bindings in case we got a StackOverflowError 373 // while we were trying to manipulate ScopedValue bindings. 374 current->clear_scopedValueBindings(); 375 THROW_HANDLE(exception); 376 JRT_END 377 378 JRT_ENTRY(void, InterpreterRuntime::throw_delayed_StackOverflowError(JavaThread* current)) 379 Handle exception = get_preinitialized_exception( 380 vmClasses::StackOverflowError_klass(), 381 CHECK); 382 java_lang_Throwable::set_message(exception(), 383 Universe::delayed_stack_overflow_error_message()); 384 // Increment counter for hs_err file reporting 385 Atomic::inc(&Exceptions::_stack_overflow_errors); 386 // Remove the ScopedValue bindings in case we got a StackOverflowError 387 // while we were trying to manipulate ScopedValue bindings. 388 current->clear_scopedValueBindings(); 389 THROW_HANDLE(exception); 390 JRT_END 391 392 JRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* current, char* name, char* message)) 393 // lookup exception klass 394 TempNewSymbol s = SymbolTable::new_symbol(name); 395 if (ProfileTraps) { 396 if (s == vmSymbols::java_lang_ArithmeticException()) { 397 note_trap(current, Deoptimization::Reason_div0_check); 398 } else if (s == vmSymbols::java_lang_NullPointerException()) { 399 note_trap(current, Deoptimization::Reason_null_check); 400 } 401 } 402 // create exception 403 Handle exception = Exceptions::new_exception(current, s, message); 404 current->set_vm_result(exception()); 405 JRT_END 406 407 408 JRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* current, char* name, oopDesc* obj)) 409 // Produce the error message first because note_trap can safepoint 410 ResourceMark rm(current); 411 const char* klass_name = obj->klass()->external_name(); 412 // lookup exception klass 413 TempNewSymbol s = SymbolTable::new_symbol(name); 414 if (ProfileTraps) { 415 if (s == vmSymbols::java_lang_ArrayStoreException()) { 416 note_trap(current, Deoptimization::Reason_array_check); 417 } else { 418 note_trap(current, Deoptimization::Reason_class_check); 419 } 420 } 421 // create exception, with klass name as detail message 422 Handle exception = Exceptions::new_exception(current, s, klass_name); 423 current->set_vm_result(exception()); 424 JRT_END 425 426 JRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* current, arrayOopDesc* a, jint index)) 427 // Produce the error message first because note_trap can safepoint 428 ResourceMark rm(current); 429 stringStream ss; 430 ss.print("Index %d out of bounds for length %d", index, a->length()); 431 432 if (ProfileTraps) { 433 note_trap(current, Deoptimization::Reason_range_check); 434 } 435 436 THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), ss.as_string()); 437 JRT_END 438 439 JRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException( 440 JavaThread* current, oopDesc* obj)) 441 442 // Produce the error message first because note_trap can safepoint 443 ResourceMark rm(current); 444 char* message = SharedRuntime::generate_class_cast_message( 445 current, obj->klass()); 446 447 if (ProfileTraps) { 448 note_trap(current, Deoptimization::Reason_class_check); 449 } 450 451 // create exception 452 THROW_MSG(vmSymbols::java_lang_ClassCastException(), message); 453 JRT_END 454 455 // exception_handler_for_exception(...) returns the continuation address, 456 // the exception oop (via TLS) and sets the bci/bcp for the continuation. 457 // The exception oop is returned to make sure it is preserved over GC (it 458 // is only on the stack if the exception was thrown explicitly via athrow). 459 // During this operation, the expression stack contains the values for the 460 // bci where the exception happened. If the exception was propagated back 461 // from a call, the expression stack contains the values for the bci at the 462 // invoke w/o arguments (i.e., as if one were inside the call). 463 JRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* current, oopDesc* exception)) 464 // We get here after we have unwound from a callee throwing an exception 465 // into the interpreter. Any deferred stack processing is notified of 466 // the event via the StackWatermarkSet. 467 StackWatermarkSet::after_unwind(current); 468 469 LastFrameAccessor last_frame(current); 470 Handle h_exception(current, exception); 471 methodHandle h_method (current, last_frame.method()); 472 constantPoolHandle h_constants(current, h_method->constants()); 473 bool should_repeat; 474 int handler_bci; 475 int current_bci = last_frame.bci(); 476 477 if (current->frames_to_pop_failed_realloc() > 0) { 478 // Allocation of scalar replaced object used in this frame 479 // failed. Unconditionally pop the frame. 480 current->dec_frames_to_pop_failed_realloc(); 481 current->set_vm_result(h_exception()); 482 // If the method is synchronized we already unlocked the monitor 483 // during deoptimization so the interpreter needs to skip it when 484 // the frame is popped. 485 current->set_do_not_unlock_if_synchronized(true); 486 return Interpreter::remove_activation_entry(); 487 } 488 489 // Need to do this check first since when _do_not_unlock_if_synchronized 490 // is set, we don't want to trigger any classloading which may make calls 491 // into java, or surprisingly find a matching exception handler for bci 0 492 // since at this moment the method hasn't been "officially" entered yet. 493 if (current->do_not_unlock_if_synchronized()) { 494 ResourceMark rm; 495 assert(current_bci == 0, "bci isn't zero for do_not_unlock_if_synchronized"); 496 current->set_vm_result(exception); 497 return Interpreter::remove_activation_entry(); 498 } 499 500 do { 501 should_repeat = false; 502 503 // assertions 504 assert(h_exception.not_null(), "null exceptions should be handled by athrow"); 505 // Check that exception is a subclass of Throwable. 506 assert(h_exception->is_a(vmClasses::Throwable_klass()), 507 "Exception not subclass of Throwable"); 508 509 // tracing 510 if (log_is_enabled(Info, exceptions)) { 511 ResourceMark rm(current); 512 stringStream tempst; 513 tempst.print("interpreter method <%s>\n" 514 " at bci %d for thread " INTPTR_FORMAT " (%s)", 515 h_method->print_value_string(), current_bci, p2i(current), current->name()); 516 Exceptions::log_exception(h_exception, tempst.as_string()); 517 } 518 // Don't go paging in something which won't be used. 519 // else if (extable->length() == 0) { 520 // // disabled for now - interpreter is not using shortcut yet 521 // // (shortcut is not to call runtime if we have no exception handlers) 522 // // warning("performance bug: should not call runtime if method has no exception handlers"); 523 // } 524 // for AbortVMOnException flag 525 Exceptions::debug_check_abort(h_exception); 526 527 // exception handler lookup 528 Klass* klass = h_exception->klass(); 529 handler_bci = Method::fast_exception_handler_bci_for(h_method, klass, current_bci, THREAD); 530 if (HAS_PENDING_EXCEPTION) { 531 // We threw an exception while trying to find the exception handler. 532 // Transfer the new exception to the exception handle which will 533 // be set into thread local storage, and do another lookup for an 534 // exception handler for this exception, this time starting at the 535 // BCI of the exception handler which caused the exception to be 536 // thrown (bug 4307310). 537 h_exception = Handle(THREAD, PENDING_EXCEPTION); 538 CLEAR_PENDING_EXCEPTION; 539 if (handler_bci >= 0) { 540 current_bci = handler_bci; 541 should_repeat = true; 542 } 543 } 544 } while (should_repeat == true); 545 546 #if INCLUDE_JVMCI 547 if (EnableJVMCI && h_method->method_data() != nullptr) { 548 ResourceMark rm(current); 549 ProfileData* pdata = h_method->method_data()->allocate_bci_to_data(current_bci, nullptr); 550 if (pdata != nullptr && pdata->is_BitData()) { 551 BitData* bit_data = (BitData*) pdata; 552 bit_data->set_exception_seen(); 553 } 554 } 555 #endif 556 557 // notify JVMTI of an exception throw; JVMTI will detect if this is a first 558 // time throw or a stack unwinding throw and accordingly notify the debugger 559 if (JvmtiExport::can_post_on_exceptions()) { 560 JvmtiExport::post_exception_throw(current, h_method(), last_frame.bcp(), h_exception()); 561 } 562 563 address continuation = nullptr; 564 address handler_pc = nullptr; 565 if (handler_bci < 0 || !current->stack_overflow_state()->reguard_stack((address) &continuation)) { 566 // Forward exception to callee (leaving bci/bcp untouched) because (a) no 567 // handler in this method, or (b) after a stack overflow there is not yet 568 // enough stack space available to reprotect the stack. 569 continuation = Interpreter::remove_activation_entry(); 570 #if COMPILER2_OR_JVMCI 571 // Count this for compilation purposes 572 h_method->interpreter_throwout_increment(THREAD); 573 #endif 574 } else { 575 // handler in this method => change bci/bcp to handler bci/bcp and continue there 576 handler_pc = h_method->code_base() + handler_bci; 577 #ifndef ZERO 578 set_bcp_and_mdp(handler_pc, current); 579 continuation = Interpreter::dispatch_table(vtos)[*handler_pc]; 580 #else 581 continuation = (address)(intptr_t) handler_bci; 582 #endif 583 } 584 585 // notify debugger of an exception catch 586 // (this is good for exceptions caught in native methods as well) 587 if (JvmtiExport::can_post_on_exceptions()) { 588 JvmtiExport::notice_unwind_due_to_exception(current, h_method(), handler_pc, h_exception(), (handler_pc != nullptr)); 589 } 590 591 current->set_vm_result(h_exception()); 592 return continuation; 593 JRT_END 594 595 596 JRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* current)) 597 assert(current->has_pending_exception(), "must only be called if there's an exception pending"); 598 // nothing to do - eventually we should remove this code entirely (see comments @ call sites) 599 JRT_END 600 601 602 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* current)) 603 THROW(vmSymbols::java_lang_AbstractMethodError()); 604 JRT_END 605 606 // This method is called from the "abstract_entry" of the interpreter. 607 // At that point, the arguments have already been removed from the stack 608 // and therefore we don't have the receiver object at our fingertips. (Though, 609 // on some platforms the receiver still resides in a register...). Thus, 610 // we have no choice but print an error message not containing the receiver 611 // type. 612 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorWithMethod(JavaThread* current, 613 Method* missingMethod)) 614 ResourceMark rm(current); 615 assert(missingMethod != nullptr, "sanity"); 616 methodHandle m(current, missingMethod); 617 LinkResolver::throw_abstract_method_error(m, THREAD); 618 JRT_END 619 620 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorVerbose(JavaThread* current, 621 Klass* recvKlass, 622 Method* missingMethod)) 623 ResourceMark rm(current); 624 methodHandle mh = methodHandle(current, missingMethod); 625 LinkResolver::throw_abstract_method_error(mh, recvKlass, THREAD); 626 JRT_END 627 628 629 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* current)) 630 THROW(vmSymbols::java_lang_IncompatibleClassChangeError()); 631 JRT_END 632 633 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeErrorVerbose(JavaThread* current, 634 Klass* recvKlass, 635 Klass* interfaceKlass)) 636 ResourceMark rm(current); 637 char buf[1000]; 638 buf[0] = '\0'; 639 jio_snprintf(buf, sizeof(buf), 640 "Class %s does not implement the requested interface %s", 641 recvKlass ? recvKlass->external_name() : "nullptr", 642 interfaceKlass ? interfaceKlass->external_name() : "nullptr"); 643 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 644 JRT_END 645 646 JRT_ENTRY(void, InterpreterRuntime::throw_NullPointerException(JavaThread* current)) 647 THROW(vmSymbols::java_lang_NullPointerException()); 648 JRT_END 649 650 //------------------------------------------------------------------------------------------------------------------------ 651 // Fields 652 // 653 654 void InterpreterRuntime::resolve_get_put(JavaThread* current, Bytecodes::Code bytecode) { 655 // resolve field 656 fieldDescriptor info; 657 LastFrameAccessor last_frame(current); 658 constantPoolHandle pool(current, last_frame.method()->constants()); 659 methodHandle m(current, last_frame.method()); 660 bool is_put = (bytecode == Bytecodes::_putfield || bytecode == Bytecodes::_nofast_putfield || 661 bytecode == Bytecodes::_putstatic); 662 bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic); 663 664 int field_index = last_frame.get_index_u2(bytecode); 665 { 666 JvmtiHideSingleStepping jhss(current); 667 JavaThread* THREAD = current; // For exception macros. 668 LinkResolver::resolve_field_access(info, pool, field_index, 669 m, bytecode, CHECK); 670 } // end JvmtiHideSingleStepping 671 672 // check if link resolution caused cpCache to be updated 673 if (pool->resolved_field_entry_at(field_index)->is_resolved(bytecode)) return; 674 675 676 // compute auxiliary field attributes 677 TosState state = as_TosState(info.field_type()); 678 679 // Resolution of put instructions on final fields is delayed. That is required so that 680 // exceptions are thrown at the correct place (when the instruction is actually invoked). 681 // If we do not resolve an instruction in the current pass, leaving the put_code 682 // set to zero will cause the next put instruction to the same field to reresolve. 683 684 // Resolution of put instructions to final instance fields with invalid updates (i.e., 685 // to final instance fields with updates originating from a method different than <init>) 686 // is inhibited. A putfield instruction targeting an instance final field must throw 687 // an IllegalAccessError if the instruction is not in an instance 688 // initializer method <init>. If resolution were not inhibited, a putfield 689 // in an initializer method could be resolved in the initializer. Subsequent 690 // putfield instructions to the same field would then use cached information. 691 // As a result, those instructions would not pass through the VM. That is, 692 // checks in resolve_field_access() would not be executed for those instructions 693 // and the required IllegalAccessError would not be thrown. 694 // 695 // Also, we need to delay resolving getstatic and putstatic instructions until the 696 // class is initialized. This is required so that access to the static 697 // field will call the initialization function every time until the class 698 // is completely initialized ala. in 2.17.5 in JVM Specification. 699 InstanceKlass* klass = info.field_holder(); 700 bool uninitialized_static = is_static && !klass->is_initialized(); 701 bool has_initialized_final_update = info.field_holder()->major_version() >= 53 && 702 info.has_initialized_final_update(); 703 assert(!(has_initialized_final_update && !info.access_flags().is_final()), "Fields with initialized final updates must be final"); 704 705 Bytecodes::Code get_code = (Bytecodes::Code)0; 706 Bytecodes::Code put_code = (Bytecodes::Code)0; 707 if (!uninitialized_static) { 708 get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield); 709 if ((is_put && !has_initialized_final_update) || !info.access_flags().is_final()) { 710 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield); 711 } 712 } 713 714 ResolvedFieldEntry* entry = pool->resolved_field_entry_at(field_index); 715 entry->set_flags(info.access_flags().is_final(), info.access_flags().is_volatile()); 716 entry->fill_in(info.field_holder(), info.offset(), 717 checked_cast<u2>(info.index()), checked_cast<u1>(state), 718 static_cast<u1>(get_code), static_cast<u1>(put_code)); 719 } 720 721 722 //------------------------------------------------------------------------------------------------------------------------ 723 // Synchronization 724 // 725 // The interpreter's synchronization code is factored out so that it can 726 // be shared by method invocation and synchronized blocks. 727 //%note synchronization_3 728 729 //%note monitor_1 730 JRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* current, BasicObjectLock* elem)) 731 assert(LockingMode != LM_LIGHTWEIGHT, "Should call monitorenter_obj() when using the new lightweight locking"); 732 #ifdef ASSERT 733 current->last_frame().interpreter_frame_verify_monitor(elem); 734 #endif 735 Handle h_obj(current, elem->obj()); 736 assert(Universe::heap()->is_in_or_null(h_obj()), 737 "must be null or an object"); 738 ObjectSynchronizer::enter(h_obj, elem->lock(), current); 739 assert(Universe::heap()->is_in_or_null(elem->obj()), 740 "must be null or an object"); 741 #ifdef ASSERT 742 current->last_frame().interpreter_frame_verify_monitor(elem); 743 #endif 744 JRT_END 745 746 // NOTE: We provide a separate implementation for the new lightweight locking to workaround a limitation 747 // of registers in x86_32. This entry point accepts an oop instead of a BasicObjectLock*. 748 // The problem is that we would need to preserve the register that holds the BasicObjectLock, 749 // but we are using that register to hold the thread. We don't have enough registers to 750 // also keep the BasicObjectLock, but we don't really need it anyway, we only need 751 // the object. See also InterpreterMacroAssembler::lock_object(). 752 // As soon as legacy stack-locking goes away we could remove the other monitorenter() entry 753 // point, and only use oop-accepting entries (same for monitorexit() below). 754 JRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter_obj(JavaThread* current, oopDesc* obj)) 755 assert(LockingMode == LM_LIGHTWEIGHT, "Should call monitorenter() when not using the new lightweight locking"); 756 Handle h_obj(current, cast_to_oop(obj)); 757 assert(Universe::heap()->is_in_or_null(h_obj()), 758 "must be null or an object"); 759 ObjectSynchronizer::enter(h_obj, nullptr, current); 760 return; 761 JRT_END 762 763 JRT_LEAF(void, InterpreterRuntime::monitorexit(BasicObjectLock* elem)) 764 oop obj = elem->obj(); 765 assert(Universe::heap()->is_in(obj), "must be an object"); 766 // The object could become unlocked through a JNI call, which we have no other checks for. 767 // Give a fatal message if CheckJNICalls. Otherwise we ignore it. 768 if (obj->is_unlocked()) { 769 if (CheckJNICalls) { 770 fatal("Object has been unlocked by JNI"); 771 } 772 return; 773 } 774 ObjectSynchronizer::exit(obj, elem->lock(), JavaThread::current()); 775 // Free entry. If it is not cleared, the exception handling code will try to unlock the monitor 776 // again at method exit or in the case of an exception. 777 elem->set_obj(nullptr); 778 JRT_END 779 780 781 JRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* current)) 782 THROW(vmSymbols::java_lang_IllegalMonitorStateException()); 783 JRT_END 784 785 786 JRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* current)) 787 // Returns an illegal exception to install into the current thread. The 788 // pending_exception flag is cleared so normal exception handling does not 789 // trigger. Any current installed exception will be overwritten. This 790 // method will be called during an exception unwind. 791 792 assert(!HAS_PENDING_EXCEPTION, "no pending exception"); 793 Handle exception(current, current->vm_result()); 794 assert(exception() != nullptr, "vm result should be set"); 795 current->set_vm_result(nullptr); // clear vm result before continuing (may cause memory leaks and assert failures) 796 exception = get_preinitialized_exception(vmClasses::IllegalMonitorStateException_klass(), CATCH); 797 current->set_vm_result(exception()); 798 JRT_END 799 800 801 //------------------------------------------------------------------------------------------------------------------------ 802 // Invokes 803 804 JRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* current, Method* method, address bcp)) 805 return method->orig_bytecode_at(method->bci_from(bcp)); 806 JRT_END 807 808 JRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* current, Method* method, address bcp, Bytecodes::Code new_code)) 809 method->set_orig_bytecode_at(method->bci_from(bcp), new_code); 810 JRT_END 811 812 JRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* current, Method* method, address bcp)) 813 JvmtiExport::post_raw_breakpoint(current, method, bcp); 814 JRT_END 815 816 void InterpreterRuntime::resolve_invoke(JavaThread* current, Bytecodes::Code bytecode) { 817 LastFrameAccessor last_frame(current); 818 // extract receiver from the outgoing argument list if necessary 819 Handle receiver(current, nullptr); 820 if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface || 821 bytecode == Bytecodes::_invokespecial) { 822 ResourceMark rm(current); 823 methodHandle m (current, last_frame.method()); 824 Bytecode_invoke call(m, last_frame.bci()); 825 Symbol* signature = call.signature(); 826 receiver = Handle(current, last_frame.callee_receiver(signature)); 827 828 assert(Universe::heap()->is_in_or_null(receiver()), 829 "sanity check"); 830 assert(receiver.is_null() || 831 !Universe::heap()->is_in(receiver->klass()), 832 "sanity check"); 833 } 834 835 // resolve method 836 CallInfo info; 837 constantPoolHandle pool(current, last_frame.method()->constants()); 838 ConstantPoolCache* cache = pool->cache(); 839 840 methodHandle resolved_method; 841 842 int method_index = last_frame.get_index_u2(bytecode); 843 { 844 JvmtiHideSingleStepping jhss(current); 845 JavaThread* THREAD = current; // For exception macros. 846 LinkResolver::resolve_invoke(info, receiver, pool, 847 method_index, bytecode, 848 THREAD); 849 850 if (HAS_PENDING_EXCEPTION) { 851 if (ProfileTraps && PENDING_EXCEPTION->klass()->name() == vmSymbols::java_lang_NullPointerException()) { 852 // Preserve the original exception across the call to note_trap() 853 PreserveExceptionMark pm(current); 854 // Recording the trap will help the compiler to potentially recognize this exception as "hot" 855 note_trap(current, Deoptimization::Reason_null_check); 856 } 857 return; 858 } 859 860 if (JvmtiExport::can_hotswap_or_post_breakpoint() && info.resolved_method()->is_old()) { 861 resolved_method = methodHandle(current, info.resolved_method()->get_new_method()); 862 } else { 863 resolved_method = methodHandle(current, info.resolved_method()); 864 } 865 } // end JvmtiHideSingleStepping 866 867 // check if link resolution caused cpCache to be updated 868 if (cache->resolved_method_entry_at(method_index)->is_resolved(bytecode)) return; 869 870 #ifdef ASSERT 871 if (bytecode == Bytecodes::_invokeinterface) { 872 if (resolved_method->method_holder() == vmClasses::Object_klass()) { 873 // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec 874 // (see also CallInfo::set_interface for details) 875 assert(info.call_kind() == CallInfo::vtable_call || 876 info.call_kind() == CallInfo::direct_call, ""); 877 assert(resolved_method->is_final() || info.has_vtable_index(), 878 "should have been set already"); 879 } else if (!resolved_method->has_itable_index()) { 880 // Resolved something like CharSequence.toString. Use vtable not itable. 881 assert(info.call_kind() != CallInfo::itable_call, ""); 882 } else { 883 // Setup itable entry 884 assert(info.call_kind() == CallInfo::itable_call, ""); 885 int index = resolved_method->itable_index(); 886 assert(info.itable_index() == index, ""); 887 } 888 } else if (bytecode == Bytecodes::_invokespecial) { 889 assert(info.call_kind() == CallInfo::direct_call, "must be direct call"); 890 } else { 891 assert(info.call_kind() == CallInfo::direct_call || 892 info.call_kind() == CallInfo::vtable_call, ""); 893 } 894 #endif 895 // Get sender and only set cpCache entry to resolved if it is not an 896 // interface. The receiver for invokespecial calls within interface 897 // methods must be checked for every call. 898 InstanceKlass* sender = pool->pool_holder(); 899 900 switch (info.call_kind()) { 901 case CallInfo::direct_call: 902 cache->set_direct_call(bytecode, method_index, resolved_method, sender->is_interface()); 903 break; 904 case CallInfo::vtable_call: 905 cache->set_vtable_call(bytecode, method_index, resolved_method, info.vtable_index()); 906 break; 907 case CallInfo::itable_call: 908 cache->set_itable_call( 909 bytecode, 910 method_index, 911 info.resolved_klass(), 912 resolved_method, 913 info.itable_index()); 914 break; 915 default: ShouldNotReachHere(); 916 } 917 } 918 919 920 // First time execution: Resolve symbols, create a permanent MethodType object. 921 void InterpreterRuntime::resolve_invokehandle(JavaThread* current) { 922 const Bytecodes::Code bytecode = Bytecodes::_invokehandle; 923 LastFrameAccessor last_frame(current); 924 925 // resolve method 926 CallInfo info; 927 constantPoolHandle pool(current, last_frame.method()->constants()); 928 int method_index = last_frame.get_index_u2(bytecode); 929 { 930 JvmtiHideSingleStepping jhss(current); 931 JavaThread* THREAD = current; // For exception macros. 932 LinkResolver::resolve_invoke(info, Handle(), pool, 933 method_index, bytecode, 934 CHECK); 935 } // end JvmtiHideSingleStepping 936 937 pool->cache()->set_method_handle(method_index, info); 938 } 939 940 // First time execution: Resolve symbols, create a permanent CallSite object. 941 void InterpreterRuntime::resolve_invokedynamic(JavaThread* current) { 942 LastFrameAccessor last_frame(current); 943 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic; 944 945 // resolve method 946 CallInfo info; 947 constantPoolHandle pool(current, last_frame.method()->constants()); 948 int index = last_frame.get_index_u4(bytecode); 949 { 950 JvmtiHideSingleStepping jhss(current); 951 JavaThread* THREAD = current; // For exception macros. 952 LinkResolver::resolve_invoke(info, Handle(), pool, 953 index, bytecode, CHECK); 954 } // end JvmtiHideSingleStepping 955 956 pool->cache()->set_dynamic_call(info, pool->decode_invokedynamic_index(index)); 957 } 958 959 // This function is the interface to the assembly code. It returns the resolved 960 // cpCache entry. This doesn't safepoint, but the helper routines safepoint. 961 // This function will check for redefinition! 962 JRT_ENTRY(void, InterpreterRuntime::resolve_from_cache(JavaThread* current, Bytecodes::Code bytecode)) { 963 switch (bytecode) { 964 case Bytecodes::_getstatic: 965 case Bytecodes::_putstatic: 966 case Bytecodes::_getfield: 967 case Bytecodes::_putfield: 968 resolve_get_put(current, bytecode); 969 break; 970 case Bytecodes::_invokevirtual: 971 case Bytecodes::_invokespecial: 972 case Bytecodes::_invokestatic: 973 case Bytecodes::_invokeinterface: 974 resolve_invoke(current, bytecode); 975 break; 976 case Bytecodes::_invokehandle: 977 resolve_invokehandle(current); 978 break; 979 case Bytecodes::_invokedynamic: 980 resolve_invokedynamic(current); 981 break; 982 default: 983 fatal("unexpected bytecode: %s", Bytecodes::name(bytecode)); 984 break; 985 } 986 } 987 JRT_END 988 989 //------------------------------------------------------------------------------------------------------------------------ 990 // Miscellaneous 991 992 993 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* current, address branch_bcp) { 994 // Enable WXWrite: the function is called directly by interpreter. 995 MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXWrite, current)); 996 997 // frequency_counter_overflow_inner can throw async exception. 998 nmethod* nm = frequency_counter_overflow_inner(current, branch_bcp); 999 assert(branch_bcp != nullptr || nm == nullptr, "always returns null for non OSR requests"); 1000 if (branch_bcp != nullptr && nm != nullptr) { 1001 // This was a successful request for an OSR nmethod. Because 1002 // frequency_counter_overflow_inner ends with a safepoint check, 1003 // nm could have been unloaded so look it up again. It's unsafe 1004 // to examine nm directly since it might have been freed and used 1005 // for something else. 1006 LastFrameAccessor last_frame(current); 1007 Method* method = last_frame.method(); 1008 int bci = method->bci_from(last_frame.bcp()); 1009 nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false); 1010 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod(); 1011 if (nm != nullptr && bs_nm != nullptr) { 1012 // in case the transition passed a safepoint we need to barrier this again 1013 if (!bs_nm->nmethod_osr_entry_barrier(nm)) { 1014 nm = nullptr; 1015 } 1016 } 1017 } 1018 if (nm != nullptr && current->is_interp_only_mode()) { 1019 // Normally we never get an nm if is_interp_only_mode() is true, because 1020 // policy()->event has a check for this and won't compile the method when 1021 // true. However, it's possible for is_interp_only_mode() to become true 1022 // during the compilation. We don't want to return the nm in that case 1023 // because we want to continue to execute interpreted. 1024 nm = nullptr; 1025 } 1026 #ifndef PRODUCT 1027 if (TraceOnStackReplacement) { 1028 if (nm != nullptr) { 1029 tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", p2i(nm->osr_entry())); 1030 nm->print(); 1031 } 1032 } 1033 #endif 1034 return nm; 1035 } 1036 1037 JRT_ENTRY(nmethod*, 1038 InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* current, address branch_bcp)) 1039 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized 1040 // flag, in case this method triggers classloading which will call into Java. 1041 UnlockFlagSaver fs(current); 1042 1043 LastFrameAccessor last_frame(current); 1044 assert(last_frame.is_interpreted_frame(), "must come from interpreter"); 1045 methodHandle method(current, last_frame.method()); 1046 const int branch_bci = branch_bcp != nullptr ? method->bci_from(branch_bcp) : InvocationEntryBci; 1047 const int bci = branch_bcp != nullptr ? method->bci_from(last_frame.bcp()) : InvocationEntryBci; 1048 1049 nmethod* osr_nm = CompilationPolicy::event(method, method, branch_bci, bci, CompLevel_none, nullptr, CHECK_NULL); 1050 1051 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod(); 1052 if (osr_nm != nullptr && bs_nm != nullptr) { 1053 if (!bs_nm->nmethod_osr_entry_barrier(osr_nm)) { 1054 osr_nm = nullptr; 1055 } 1056 } 1057 return osr_nm; 1058 JRT_END 1059 1060 JRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp)) 1061 assert(ProfileInterpreter, "must be profiling interpreter"); 1062 int bci = method->bci_from(cur_bcp); 1063 MethodData* mdo = method->method_data(); 1064 if (mdo == nullptr) return 0; 1065 return mdo->bci_to_di(bci); 1066 JRT_END 1067 1068 #ifdef ASSERT 1069 JRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp)) 1070 assert(ProfileInterpreter, "must be profiling interpreter"); 1071 1072 MethodData* mdo = method->method_data(); 1073 assert(mdo != nullptr, "must not be null"); 1074 1075 int bci = method->bci_from(bcp); 1076 1077 address mdp2 = mdo->bci_to_dp(bci); 1078 if (mdp != mdp2) { 1079 ResourceMark rm; 1080 tty->print_cr("FAILED verify : actual mdp %p expected mdp %p @ bci %d", mdp, mdp2, bci); 1081 int current_di = mdo->dp_to_di(mdp); 1082 int expected_di = mdo->dp_to_di(mdp2); 1083 tty->print_cr(" actual di %d expected di %d", current_di, expected_di); 1084 int expected_approx_bci = mdo->data_at(expected_di)->bci(); 1085 int approx_bci = -1; 1086 if (current_di >= 0) { 1087 approx_bci = mdo->data_at(current_di)->bci(); 1088 } 1089 tty->print_cr(" actual bci is %d expected bci %d", approx_bci, expected_approx_bci); 1090 mdo->print_on(tty); 1091 method->print_codes(); 1092 } 1093 assert(mdp == mdp2, "wrong mdp"); 1094 JRT_END 1095 #endif // ASSERT 1096 1097 JRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* current, int return_bci)) 1098 assert(ProfileInterpreter, "must be profiling interpreter"); 1099 ResourceMark rm(current); 1100 LastFrameAccessor last_frame(current); 1101 assert(last_frame.is_interpreted_frame(), "must come from interpreter"); 1102 MethodData* h_mdo = last_frame.method()->method_data(); 1103 1104 // Grab a lock to ensure atomic access to setting the return bci and 1105 // the displacement. This can block and GC, invalidating all naked oops. 1106 MutexLocker ml(RetData_lock); 1107 1108 // ProfileData is essentially a wrapper around a derived oop, so we 1109 // need to take the lock before making any ProfileData structures. 1110 ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(last_frame.mdp())); 1111 guarantee(data != nullptr, "profile data must be valid"); 1112 RetData* rdata = data->as_RetData(); 1113 address new_mdp = rdata->fixup_ret(return_bci, h_mdo); 1114 last_frame.set_mdp(new_mdp); 1115 JRT_END 1116 1117 JRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* current, Method* m)) 1118 return Method::build_method_counters(current, m); 1119 JRT_END 1120 1121 1122 JRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* current)) 1123 // We used to need an explicit preserve_arguments here for invoke bytecodes. However, 1124 // stack traversal automatically takes care of preserving arguments for invoke, so 1125 // this is no longer needed. 1126 1127 // JRT_END does an implicit safepoint check, hence we are guaranteed to block 1128 // if this is called during a safepoint 1129 1130 if (JvmtiExport::should_post_single_step()) { 1131 // This function is called by the interpreter when single stepping. Such single 1132 // stepping could unwind a frame. Then, it is important that we process any frames 1133 // that we might return into. 1134 StackWatermarkSet::before_unwind(current); 1135 1136 // We are called during regular safepoints and when the VM is 1137 // single stepping. If any thread is marked for single stepping, 1138 // then we may have JVMTI work to do. 1139 LastFrameAccessor last_frame(current); 1140 JvmtiExport::at_single_stepping_point(current, last_frame.method(), last_frame.bcp()); 1141 } 1142 JRT_END 1143 1144 JRT_LEAF(void, InterpreterRuntime::at_unwind(JavaThread* current)) 1145 assert(current == JavaThread::current(), "pre-condition"); 1146 // This function is called by the interpreter when the return poll found a reason 1147 // to call the VM. The reason could be that we are returning into a not yet safe 1148 // to access frame. We handle that below. 1149 // Note that this path does not check for single stepping, because we do not want 1150 // to single step when unwinding frames for an exception being thrown. Instead, 1151 // such single stepping code will use the safepoint table, which will use the 1152 // InterpreterRuntime::at_safepoint callback. 1153 StackWatermarkSet::before_unwind(current); 1154 JRT_END 1155 1156 JRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread* current, oopDesc* obj, 1157 ResolvedFieldEntry *entry)) 1158 1159 // check the access_flags for the field in the klass 1160 1161 InstanceKlass* ik = entry->field_holder(); 1162 int index = entry->field_index(); 1163 if (!ik->field_status(index).is_access_watched()) return; 1164 1165 bool is_static = (obj == nullptr); 1166 HandleMark hm(current); 1167 1168 Handle h_obj; 1169 if (!is_static) { 1170 // non-static field accessors have an object, but we need a handle 1171 h_obj = Handle(current, obj); 1172 } 1173 InstanceKlass* field_holder = entry->field_holder(); // HERE 1174 jfieldID fid = jfieldIDWorkaround::to_jfieldID(field_holder, entry->field_offset(), is_static); 1175 LastFrameAccessor last_frame(current); 1176 JvmtiExport::post_field_access(current, last_frame.method(), last_frame.bcp(), field_holder, h_obj, fid); 1177 JRT_END 1178 1179 JRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread* current, oopDesc* obj, 1180 ResolvedFieldEntry *entry, jvalue *value)) 1181 1182 InstanceKlass* ik = entry->field_holder(); 1183 1184 // check the access_flags for the field in the klass 1185 int index = entry->field_index(); 1186 // bail out if field modifications are not watched 1187 if (!ik->field_status(index).is_modification_watched()) return; 1188 1189 char sig_type = '\0'; 1190 1191 switch((TosState)entry->tos_state()) { 1192 case btos: sig_type = JVM_SIGNATURE_BYTE; break; 1193 case ztos: sig_type = JVM_SIGNATURE_BOOLEAN; break; 1194 case ctos: sig_type = JVM_SIGNATURE_CHAR; break; 1195 case stos: sig_type = JVM_SIGNATURE_SHORT; break; 1196 case itos: sig_type = JVM_SIGNATURE_INT; break; 1197 case ftos: sig_type = JVM_SIGNATURE_FLOAT; break; 1198 case atos: sig_type = JVM_SIGNATURE_CLASS; break; 1199 case ltos: sig_type = JVM_SIGNATURE_LONG; break; 1200 case dtos: sig_type = JVM_SIGNATURE_DOUBLE; break; 1201 default: ShouldNotReachHere(); return; 1202 } 1203 bool is_static = (obj == nullptr); 1204 1205 HandleMark hm(current); 1206 jfieldID fid = jfieldIDWorkaround::to_jfieldID(ik, entry->field_offset(), is_static); 1207 jvalue fvalue; 1208 #ifdef _LP64 1209 fvalue = *value; 1210 #else 1211 // Long/double values are stored unaligned and also noncontiguously with 1212 // tagged stacks. We can't just do a simple assignment even in the non- 1213 // J/D cases because a C++ compiler is allowed to assume that a jvalue is 1214 // 8-byte aligned, and interpreter stack slots are only 4-byte aligned. 1215 // We assume that the two halves of longs/doubles are stored in interpreter 1216 // stack slots in platform-endian order. 1217 jlong_accessor u; 1218 jint* newval = (jint*)value; 1219 u.words[0] = newval[0]; 1220 u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag 1221 fvalue.j = u.long_value; 1222 #endif // _LP64 1223 1224 Handle h_obj; 1225 if (!is_static) { 1226 // non-static field accessors have an object, but we need a handle 1227 h_obj = Handle(current, obj); 1228 } 1229 1230 LastFrameAccessor last_frame(current); 1231 JvmtiExport::post_raw_field_modification(current, last_frame.method(), last_frame.bcp(), ik, h_obj, 1232 fid, sig_type, &fvalue); 1233 JRT_END 1234 1235 JRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread* current)) 1236 LastFrameAccessor last_frame(current); 1237 JvmtiExport::post_method_entry(current, last_frame.method(), last_frame.get_frame()); 1238 JRT_END 1239 1240 1241 // This is a JRT_BLOCK_ENTRY because we have to stash away the return oop 1242 // before transitioning to VM, and restore it after transitioning back 1243 // to Java. The return oop at the top-of-stack, is not walked by the GC. 1244 JRT_BLOCK_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread* current)) 1245 LastFrameAccessor last_frame(current); 1246 JvmtiExport::post_method_exit(current, last_frame.method(), last_frame.get_frame()); 1247 JRT_END 1248 1249 JRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc)) 1250 { 1251 return (Interpreter::contains(Continuation::get_top_return_pc_post_barrier(JavaThread::current(), pc)) ? 1 : 0); 1252 } 1253 JRT_END 1254 1255 1256 // Implementation of SignatureHandlerLibrary 1257 1258 #ifndef SHARING_FAST_NATIVE_FINGERPRINTS 1259 // Dummy definition (else normalization method is defined in CPU 1260 // dependent code) 1261 uint64_t InterpreterRuntime::normalize_fast_native_fingerprint(uint64_t fingerprint) { 1262 return fingerprint; 1263 } 1264 #endif 1265 1266 address SignatureHandlerLibrary::set_handler_blob() { 1267 BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size); 1268 if (handler_blob == nullptr) { 1269 return nullptr; 1270 } 1271 address handler = handler_blob->code_begin(); 1272 _handler_blob = handler_blob; 1273 _handler = handler; 1274 return handler; 1275 } 1276 1277 void SignatureHandlerLibrary::initialize() { 1278 if (_fingerprints != nullptr) { 1279 return; 1280 } 1281 if (set_handler_blob() == nullptr) { 1282 vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers"); 1283 } 1284 1285 BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer", 1286 SignatureHandlerLibrary::buffer_size); 1287 _buffer = bb->code_begin(); 1288 1289 _fingerprints = new (mtCode) GrowableArray<uint64_t>(32, mtCode); 1290 _handlers = new (mtCode) GrowableArray<address>(32, mtCode); 1291 } 1292 1293 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) { 1294 address handler = _handler; 1295 int insts_size = buffer->pure_insts_size(); 1296 if (handler + insts_size > _handler_blob->code_end()) { 1297 // get a new handler blob 1298 handler = set_handler_blob(); 1299 } 1300 if (handler != nullptr) { 1301 memcpy(handler, buffer->insts_begin(), insts_size); 1302 pd_set_handler(handler); 1303 ICache::invalidate_range(handler, insts_size); 1304 _handler = handler + insts_size; 1305 } 1306 return handler; 1307 } 1308 1309 void SignatureHandlerLibrary::add(const methodHandle& method) { 1310 if (method->signature_handler() == nullptr) { 1311 // use slow signature handler if we can't do better 1312 int handler_index = -1; 1313 // check if we can use customized (fast) signature handler 1314 if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::fp_max_size_of_parameters) { 1315 // use customized signature handler 1316 MutexLocker mu(SignatureHandlerLibrary_lock); 1317 // make sure data structure is initialized 1318 initialize(); 1319 // lookup method signature's fingerprint 1320 uint64_t fingerprint = Fingerprinter(method).fingerprint(); 1321 // allow CPU dependent code to optimize the fingerprints for the fast handler 1322 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint); 1323 handler_index = _fingerprints->find(fingerprint); 1324 // create handler if necessary 1325 if (handler_index < 0) { 1326 ResourceMark rm; 1327 ptrdiff_t align_offset = align_up(_buffer, CodeEntryAlignment) - (address)_buffer; 1328 CodeBuffer buffer((address)(_buffer + align_offset), 1329 checked_cast<int>(SignatureHandlerLibrary::buffer_size - align_offset)); 1330 InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint); 1331 // copy into code heap 1332 address handler = set_handler(&buffer); 1333 if (handler == nullptr) { 1334 // use slow signature handler (without memorizing it in the fingerprints) 1335 } else { 1336 // debugging support 1337 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) { 1338 ttyLocker ttyl; 1339 tty->cr(); 1340 tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)", 1341 _handlers->length(), 1342 (method->is_static() ? "static" : "receiver"), 1343 method->name_and_sig_as_C_string(), 1344 fingerprint, 1345 buffer.insts_size()); 1346 if (buffer.insts_size() > 0) { 1347 Disassembler::decode(handler, handler + buffer.insts_size(), tty 1348 NOT_PRODUCT(COMMA &buffer.asm_remarks())); 1349 } 1350 #ifndef PRODUCT 1351 address rh_begin = Interpreter::result_handler(method()->result_type()); 1352 if (CodeCache::contains(rh_begin)) { 1353 // else it might be special platform dependent values 1354 tty->print_cr(" --- associated result handler ---"); 1355 address rh_end = rh_begin; 1356 while (*(int*)rh_end != 0) { 1357 rh_end += sizeof(int); 1358 } 1359 Disassembler::decode(rh_begin, rh_end); 1360 } else { 1361 tty->print_cr(" associated result handler: " PTR_FORMAT, p2i(rh_begin)); 1362 } 1363 #endif 1364 } 1365 // add handler to library 1366 _fingerprints->append(fingerprint); 1367 _handlers->append(handler); 1368 // set handler index 1369 assert(_fingerprints->length() == _handlers->length(), "sanity check"); 1370 handler_index = _fingerprints->length() - 1; 1371 } 1372 } 1373 // Set handler under SignatureHandlerLibrary_lock 1374 if (handler_index < 0) { 1375 // use generic signature handler 1376 method->set_signature_handler(Interpreter::slow_signature_handler()); 1377 } else { 1378 // set handler 1379 method->set_signature_handler(_handlers->at(handler_index)); 1380 } 1381 } else { 1382 DEBUG_ONLY(JavaThread::current()->check_possible_safepoint()); 1383 // use generic signature handler 1384 method->set_signature_handler(Interpreter::slow_signature_handler()); 1385 } 1386 } 1387 #ifdef ASSERT 1388 int handler_index = -1; 1389 int fingerprint_index = -2; 1390 { 1391 // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized 1392 // in any way if accessed from multiple threads. To avoid races with another 1393 // thread which may change the arrays in the above, mutex protected block, we 1394 // have to protect this read access here with the same mutex as well! 1395 MutexLocker mu(SignatureHandlerLibrary_lock); 1396 if (_handlers != nullptr) { 1397 handler_index = _handlers->find(method->signature_handler()); 1398 uint64_t fingerprint = Fingerprinter(method).fingerprint(); 1399 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint); 1400 fingerprint_index = _fingerprints->find(fingerprint); 1401 } 1402 } 1403 assert(method->signature_handler() == Interpreter::slow_signature_handler() || 1404 handler_index == fingerprint_index, "sanity check"); 1405 #endif // ASSERT 1406 } 1407 1408 void SignatureHandlerLibrary::add(uint64_t fingerprint, address handler) { 1409 int handler_index = -1; 1410 // use customized signature handler 1411 MutexLocker mu(SignatureHandlerLibrary_lock); 1412 // make sure data structure is initialized 1413 initialize(); 1414 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint); 1415 handler_index = _fingerprints->find(fingerprint); 1416 // create handler if necessary 1417 if (handler_index < 0) { 1418 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) { 1419 tty->cr(); 1420 tty->print_cr("argument handler #%d at " PTR_FORMAT " for fingerprint " UINT64_FORMAT, 1421 _handlers->length(), 1422 p2i(handler), 1423 fingerprint); 1424 } 1425 _fingerprints->append(fingerprint); 1426 _handlers->append(handler); 1427 } else { 1428 if (PrintSignatureHandlers) { 1429 tty->cr(); 1430 tty->print_cr("duplicate argument handler #%d for fingerprint " UINT64_FORMAT "(old: " PTR_FORMAT ", new : " PTR_FORMAT ")", 1431 _handlers->length(), 1432 fingerprint, 1433 p2i(_handlers->at(handler_index)), 1434 p2i(handler)); 1435 } 1436 } 1437 } 1438 1439 1440 BufferBlob* SignatureHandlerLibrary::_handler_blob = nullptr; 1441 address SignatureHandlerLibrary::_handler = nullptr; 1442 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = nullptr; 1443 GrowableArray<address>* SignatureHandlerLibrary::_handlers = nullptr; 1444 address SignatureHandlerLibrary::_buffer = nullptr; 1445 1446 1447 JRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* current, Method* method)) 1448 methodHandle m(current, method); 1449 assert(m->is_native(), "sanity check"); 1450 // lookup native function entry point if it doesn't exist 1451 if (!m->has_native_function()) { 1452 NativeLookup::lookup(m, CHECK); 1453 } 1454 // make sure signature handler is installed 1455 SignatureHandlerLibrary::add(m); 1456 // The interpreter entry point checks the signature handler first, 1457 // before trying to fetch the native entry point and klass mirror. 1458 // We must set the signature handler last, so that multiple processors 1459 // preparing the same method will be sure to see non-null entry & mirror. 1460 JRT_END 1461 1462 #if defined(IA32) || defined(AMD64) || defined(ARM) 1463 JRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* current, void* src_address, void* dest_address)) 1464 assert(current == JavaThread::current(), "pre-condition"); 1465 if (src_address == dest_address) { 1466 return; 1467 } 1468 ResourceMark rm; 1469 LastFrameAccessor last_frame(current); 1470 assert(last_frame.is_interpreted_frame(), ""); 1471 jint bci = last_frame.bci(); 1472 methodHandle mh(current, last_frame.method()); 1473 Bytecode_invoke invoke(mh, bci); 1474 ArgumentSizeComputer asc(invoke.signature()); 1475 int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver 1476 Copy::conjoint_jbytes(src_address, dest_address, 1477 size_of_arguments * Interpreter::stackElementSize); 1478 JRT_END 1479 #endif 1480 1481 #if INCLUDE_JVMTI 1482 // This is a support of the JVMTI PopFrame interface. 1483 // Make sure it is an invokestatic of a polymorphic intrinsic that has a member_name argument 1484 // and return it as a vm_result so that it can be reloaded in the list of invokestatic parameters. 1485 // The member_name argument is a saved reference (in local#0) to the member_name. 1486 // For backward compatibility with some JDK versions (7, 8) it can also be a direct method handle. 1487 // FIXME: remove DMH case after j.l.i.InvokerBytecodeGenerator code shape is updated. 1488 JRT_ENTRY(void, InterpreterRuntime::member_name_arg_or_null(JavaThread* current, address member_name, 1489 Method* method, address bcp)) 1490 Bytecodes::Code code = Bytecodes::code_at(method, bcp); 1491 if (code != Bytecodes::_invokestatic) { 1492 return; 1493 } 1494 ConstantPool* cpool = method->constants(); 1495 int cp_index = Bytes::get_native_u2(bcp + 1); 1496 Symbol* cname = cpool->klass_name_at(cpool->klass_ref_index_at(cp_index, code)); 1497 Symbol* mname = cpool->name_ref_at(cp_index, code); 1498 1499 if (MethodHandles::has_member_arg(cname, mname)) { 1500 oop member_name_oop = cast_to_oop(member_name); 1501 if (java_lang_invoke_DirectMethodHandle::is_instance(member_name_oop)) { 1502 // FIXME: remove after j.l.i.InvokerBytecodeGenerator code shape is updated. 1503 member_name_oop = java_lang_invoke_DirectMethodHandle::member(member_name_oop); 1504 } 1505 current->set_vm_result(member_name_oop); 1506 } else { 1507 current->set_vm_result(nullptr); 1508 } 1509 JRT_END 1510 #endif // INCLUDE_JVMTI 1511 1512 #ifndef PRODUCT 1513 // This must be a JRT_LEAF function because the interpreter must save registers on x86 to 1514 // call this, which changes rsp and makes the interpreter's expression stack not walkable. 1515 // The generated code still uses call_VM because that will set up the frame pointer for 1516 // bcp and method. 1517 JRT_LEAF(intptr_t, InterpreterRuntime::trace_bytecode(JavaThread* current, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2)) 1518 assert(current == JavaThread::current(), "pre-condition"); 1519 LastFrameAccessor last_frame(current); 1520 assert(last_frame.is_interpreted_frame(), "must be an interpreted frame"); 1521 methodHandle mh(current, last_frame.method()); 1522 BytecodeTracer::trace_interpreter(mh, last_frame.bcp(), tos, tos2); 1523 return preserve_this_value; 1524 JRT_END 1525 #endif // !PRODUCT