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/systemDictionary.hpp" 29 #include "classfile/vmClasses.hpp" 30 #include "classfile/vmSymbols.hpp" 31 #include "code/codeCache.hpp" 32 #include "compiler/compilationPolicy.hpp" 33 #include "compiler/compileBroker.hpp" 34 #include "compiler/disassembler.hpp" 35 #include "gc/shared/barrierSetNMethod.hpp" 36 #include "gc/shared/collectedHeap.hpp" 37 #include "interpreter/bytecodeTracer.hpp" 38 #include "interpreter/interpreter.hpp" 39 #include "interpreter/interpreterRuntime.hpp" 40 #include "interpreter/linkResolver.hpp" 41 #include "interpreter/templateTable.hpp" 42 #include "jvm_io.h" 43 #include "logging/log.hpp" 44 #include "memory/oopFactory.hpp" 45 #include "memory/resourceArea.hpp" 46 #include "memory/universe.hpp" 47 #include "oops/constantPool.inline.hpp" 48 #include "oops/cpCache.inline.hpp" 49 #include "oops/flatArrayKlass.hpp" 50 #include "oops/flatArrayOop.inline.hpp" 51 #include "oops/inlineKlass.inline.hpp" 52 #include "oops/instanceKlass.inline.hpp" 53 #include "oops/klass.inline.hpp" 54 #include "oops/methodData.hpp" 55 #include "oops/method.inline.hpp" 56 #include "oops/objArrayKlass.hpp" 57 #include "oops/objArrayOop.inline.hpp" 58 #include "oops/oop.inline.hpp" 59 #include "oops/symbol.hpp" 60 #include "prims/jvmtiExport.hpp" 61 #include "prims/methodHandles.hpp" 62 #include "prims/nativeLookup.hpp" 63 #include "runtime/atomic.hpp" 64 #include "runtime/continuation.hpp" 65 #include "runtime/deoptimization.hpp" 66 #include "runtime/fieldDescriptor.inline.hpp" 67 #include "runtime/frame.inline.hpp" 68 #include "runtime/handles.inline.hpp" 69 #include "runtime/icache.hpp" 70 #include "runtime/interfaceSupport.inline.hpp" 71 #include "runtime/java.hpp" 72 #include "runtime/javaCalls.hpp" 73 #include "runtime/jfieldIDWorkaround.hpp" 74 #include "runtime/osThread.hpp" 75 #include "runtime/sharedRuntime.hpp" 76 #include "runtime/stackWatermarkSet.hpp" 77 #include "runtime/stubRoutines.hpp" 78 #include "runtime/synchronizer.hpp" 79 #include "runtime/threadCritical.hpp" 80 #include "utilities/align.hpp" 81 #include "utilities/checkedCast.hpp" 82 #include "utilities/copy.hpp" 83 #include "utilities/events.hpp" 84 #include "utilities/globalDefinitions.hpp" 85 #ifdef COMPILER2 86 #include "opto/runtime.hpp" 87 #endif 88 89 // Helper class to access current interpreter state 90 class LastFrameAccessor : public StackObj { 91 frame _last_frame; 92 public: 93 LastFrameAccessor(JavaThread* current) { 94 assert(current == Thread::current(), "sanity"); 95 _last_frame = current->last_frame(); 96 } 97 bool is_interpreted_frame() const { return _last_frame.is_interpreted_frame(); } 98 Method* method() const { return _last_frame.interpreter_frame_method(); } 99 address bcp() const { return _last_frame.interpreter_frame_bcp(); } 100 int bci() const { return _last_frame.interpreter_frame_bci(); } 101 address mdp() const { return _last_frame.interpreter_frame_mdp(); } 102 103 void set_bcp(address bcp) { _last_frame.interpreter_frame_set_bcp(bcp); } 104 void set_mdp(address dp) { _last_frame.interpreter_frame_set_mdp(dp); } 105 106 // pass method to avoid calling unsafe bcp_to_method (partial fix 4926272) 107 Bytecodes::Code code() const { return Bytecodes::code_at(method(), bcp()); } 108 109 Bytecode bytecode() const { return Bytecode(method(), bcp()); } 110 int get_index_u1(Bytecodes::Code bc) const { return bytecode().get_index_u1(bc); } 111 int get_index_u2(Bytecodes::Code bc) const { return bytecode().get_index_u2(bc); } 112 int get_index_u2_cpcache(Bytecodes::Code bc) const 113 { return bytecode().get_index_u2_cpcache(bc); } 114 int get_index_u4(Bytecodes::Code bc) const { return bytecode().get_index_u4(bc); } 115 int number_of_dimensions() const { return bcp()[3]; } 116 ConstantPoolCacheEntry* cache_entry_at(int i) const 117 { return method()->constants()->cache()->entry_at(i); } 118 ConstantPoolCacheEntry* cache_entry() const { return cache_entry_at(Bytes::get_native_u2(bcp() + 1)); } 119 120 oop callee_receiver(Symbol* signature) { 121 return _last_frame.interpreter_callee_receiver(signature); 122 } 123 BasicObjectLock* monitor_begin() const { 124 return _last_frame.interpreter_frame_monitor_begin(); 125 } 126 BasicObjectLock* monitor_end() const { 127 return _last_frame.interpreter_frame_monitor_end(); 128 } 129 BasicObjectLock* next_monitor(BasicObjectLock* current) const { 130 return _last_frame.next_monitor_in_interpreter_frame(current); 131 } 132 133 frame& get_frame() { return _last_frame; } 134 }; 135 136 //------------------------------------------------------------------------------------------------------------------------ 137 // State accessors 138 139 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread* current) { 140 LastFrameAccessor last_frame(current); 141 last_frame.set_bcp(bcp); 142 if (ProfileInterpreter) { 143 // ProfileTraps uses MDOs independently of ProfileInterpreter. 144 // That is why we must check both ProfileInterpreter and mdo != nullptr. 145 MethodData* mdo = last_frame.method()->method_data(); 146 if (mdo != nullptr) { 147 NEEDS_CLEANUP; 148 last_frame.set_mdp(mdo->bci_to_dp(last_frame.bci())); 149 } 150 } 151 } 152 153 //------------------------------------------------------------------------------------------------------------------------ 154 // Constants 155 156 157 JRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* current, bool wide)) 158 // access constant pool 159 LastFrameAccessor last_frame(current); 160 ConstantPool* pool = last_frame.method()->constants(); 161 int cp_index = wide ? last_frame.get_index_u2(Bytecodes::_ldc_w) : last_frame.get_index_u1(Bytecodes::_ldc); 162 constantTag tag = pool->tag_at(cp_index); 163 164 assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call"); 165 Klass* klass = pool->klass_at(cp_index, CHECK); 166 oop java_class = tag.is_Qdescriptor_klass() 167 ? InlineKlass::cast(klass)->val_mirror() 168 : klass->java_mirror(); 169 current->set_vm_result(java_class); 170 JRT_END 171 172 JRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* current, Bytecodes::Code bytecode)) { 173 assert(bytecode == Bytecodes::_ldc || 174 bytecode == Bytecodes::_ldc_w || 175 bytecode == Bytecodes::_ldc2_w || 176 bytecode == Bytecodes::_fast_aldc || 177 bytecode == Bytecodes::_fast_aldc_w, "wrong bc"); 178 ResourceMark rm(current); 179 const bool is_fast_aldc = (bytecode == Bytecodes::_fast_aldc || 180 bytecode == Bytecodes::_fast_aldc_w); 181 LastFrameAccessor last_frame(current); 182 methodHandle m (current, last_frame.method()); 183 Bytecode_loadconstant ldc(m, last_frame.bci()); 184 185 // Double-check the size. (Condy can have any type.) 186 BasicType type = ldc.result_type(); 187 switch (type2size[type]) { 188 case 2: guarantee(bytecode == Bytecodes::_ldc2_w, ""); break; 189 case 1: guarantee(bytecode != Bytecodes::_ldc2_w, ""); break; 190 default: ShouldNotReachHere(); 191 } 192 193 // Resolve the constant. This does not do unboxing. 194 // But it does replace Universe::the_null_sentinel by null. 195 oop result = ldc.resolve_constant(CHECK); 196 assert(result != nullptr || is_fast_aldc, "null result only valid for fast_aldc"); 197 198 #ifdef ASSERT 199 { 200 // The bytecode wrappers aren't GC-safe so construct a new one 201 Bytecode_loadconstant ldc2(m, last_frame.bci()); 202 int rindex = ldc2.cache_index(); 203 if (rindex < 0) 204 rindex = m->constants()->cp_to_object_index(ldc2.pool_index()); 205 if (rindex >= 0) { 206 oop coop = m->constants()->resolved_reference_at(rindex); 207 oop roop = (result == nullptr ? Universe::the_null_sentinel() : result); 208 assert(roop == coop, "expected result for assembly code"); 209 } 210 } 211 #endif 212 current->set_vm_result(result); 213 if (!is_fast_aldc) { 214 // Tell the interpreter how to unbox the primitive. 215 guarantee(java_lang_boxing_object::is_instance(result, type), ""); 216 int offset = java_lang_boxing_object::value_offset(type); 217 intptr_t flags = ((as_TosState(type) << ConstantPoolCacheEntry::tos_state_shift) 218 | (offset & ConstantPoolCacheEntry::field_index_mask)); 219 current->set_vm_result_2((Metadata*)flags); 220 } 221 } 222 JRT_END 223 224 225 //------------------------------------------------------------------------------------------------------------------------ 226 // Allocation 227 228 JRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* current, ConstantPool* pool, int index)) 229 Klass* k = pool->klass_at(index, CHECK); 230 InstanceKlass* klass = InstanceKlass::cast(k); 231 232 if (klass->is_inline_klass()) { 233 THROW(vmSymbols::java_lang_InstantiationError()); 234 } 235 236 // Make sure we are not instantiating an abstract klass 237 klass->check_valid_for_instantiation(true, CHECK); 238 239 // Make sure klass is initialized 240 klass->initialize(CHECK); 241 242 // At this point the class may not be fully initialized 243 // because of recursive initialization. If it is fully 244 // initialized & has_finalized is not set, we rewrite 245 // it into its fast version (Note: no locking is needed 246 // here since this is an atomic byte write and can be 247 // done more than once). 248 // 249 // Note: In case of classes with has_finalized we don't 250 // rewrite since that saves us an extra check in 251 // the fast version which then would call the 252 // slow version anyway (and do a call back into 253 // Java). 254 // If we have a breakpoint, then we don't rewrite 255 // because the _breakpoint bytecode would be lost. 256 oop obj = klass->allocate_instance(CHECK); 257 current->set_vm_result(obj); 258 JRT_END 259 260 JRT_ENTRY(void, InterpreterRuntime::aconst_init(JavaThread* current, ConstantPool* pool, int index)) 261 // Getting the InlineKlass 262 Klass* k = pool->klass_at(index, CHECK); 263 if (!k->is_inline_klass()) { 264 // inconsistency with 'new' which throws an InstantiationError 265 // in the future, aconst_init will just return null instead of throwing an exception 266 THROW(vmSymbols::java_lang_IncompatibleClassChangeError()); 267 } 268 assert(k->is_inline_klass(), "aconst_init argument must be the inline type class"); 269 InlineKlass* vklass = InlineKlass::cast(k); 270 271 vklass->initialize(CHECK); 272 oop res = vklass->default_value(); 273 current->set_vm_result(res); 274 JRT_END 275 276 JRT_ENTRY(int, InterpreterRuntime::withfield(JavaThread* current, ResolvedFieldEntry* entry, uintptr_t ptr)) 277 assert(entry->is_valid(), "Invalid ResolvedFieldEntry"); 278 oop obj = nullptr; 279 int recv_offset = type2size[as_BasicType((TosState)entry->tos_state())]; 280 assert(frame::interpreter_frame_expression_stack_direction() == -1, "currently is -1 on all platforms"); 281 int ret_adj = (recv_offset + type2size[T_OBJECT] )* AbstractInterpreter::stackElementSize; 282 int offset = entry->field_offset(); 283 obj = (oopDesc*)(((uintptr_t*)ptr)[recv_offset * Interpreter::stackElementWords]); 284 if (obj == nullptr) { 285 THROW_(vmSymbols::java_lang_NullPointerException(), ret_adj); 286 } 287 assert(oopDesc::is_oop(obj), "Verifying receiver"); 288 assert(obj->klass()->is_inline_klass(), "Must have been checked during resolution"); 289 instanceHandle old_value_h(THREAD, (instanceOop)obj); 290 oop ref = nullptr; 291 if (entry->tos_state() == atos) { 292 ref = *(oopDesc**)ptr; 293 } 294 Handle ref_h(THREAD, ref); 295 InlineKlass* ik = InlineKlass::cast(old_value_h()->klass()); 296 // Ensure that the class is initialized or being initialized 297 // If the class is in error state, the creation of a new value should not be allowed 298 ik->initialize(CHECK_(ret_adj)); 299 300 bool can_skip = false; 301 switch(entry->tos_state()) { 302 case ztos: 303 if (old_value_h()->bool_field(offset) == (jboolean)(*(jint*)ptr)) can_skip = true; 304 break; 305 case btos: 306 if (old_value_h()->byte_field(offset) == (jbyte)(*(jint*)ptr)) can_skip = true; 307 break; 308 case ctos: 309 if (old_value_h()->char_field(offset) == (jchar)(*(jint*)ptr)) can_skip = true; 310 break; 311 case stos: 312 if (old_value_h()->short_field(offset) == (jshort)(*(jint*)ptr)) can_skip = true; 313 break; 314 case itos: 315 if (old_value_h()->int_field(offset) == *(jint*)ptr) can_skip = true; 316 break; 317 case ltos: 318 if (old_value_h()->long_field(offset) == *(jlong*)ptr) can_skip = true; 319 break; 320 case ftos: 321 if (memcmp(old_value_h()->field_addr<jfloat>(offset), (jfloat*)ptr, sizeof(jfloat)) == 0) can_skip = true; 322 break; 323 case dtos: 324 if (memcmp(old_value_h()->field_addr<jdouble>(offset), (jdouble*)ptr, sizeof(jdouble)) == 0) can_skip = true; 325 break; 326 case atos: 327 if (!entry->is_flat() && old_value_h()->obj_field(offset) == ref_h()) can_skip = true; 328 break; 329 default: 330 break; 331 } 332 if (can_skip) { 333 current->set_vm_result(old_value_h()); 334 return ret_adj; 335 } 336 337 instanceOop new_value = ik->allocate_instance_buffer(CHECK_(ret_adj)); 338 Handle new_value_h = Handle(THREAD, new_value); 339 ik->inline_copy_oop_to_new_oop(old_value_h(), new_value_h()); 340 switch(entry->tos_state()) { 341 case ztos: 342 new_value_h()->bool_field_put(offset, (jboolean)(*(jint*)ptr)); 343 break; 344 case btos: 345 new_value_h()->byte_field_put(offset, (jbyte)(*(jint*)ptr)); 346 break; 347 case ctos: 348 new_value_h()->char_field_put(offset, (jchar)(*(jint*)ptr)); 349 break; 350 case stos: 351 new_value_h()->short_field_put(offset, (jshort)(*(jint*)ptr)); 352 break; 353 case itos: 354 new_value_h()->int_field_put(offset, (*(jint*)ptr)); 355 break; 356 case ltos: 357 new_value_h()->long_field_put(offset, *(jlong*)ptr); 358 break; 359 case ftos: 360 new_value_h()->float_field_put(offset, *(jfloat*)ptr); 361 break; 362 case dtos: 363 new_value_h()->double_field_put(offset, *(jdouble*)ptr); 364 break; 365 case atos: 366 { 367 if (entry->is_null_free_inline_type()) { 368 if (!entry->is_flat()) { 369 if (ref_h() == nullptr) { 370 THROW_(vmSymbols::java_lang_NullPointerException(), ret_adj); 371 } 372 new_value_h()->obj_field_put(offset, ref_h()); 373 } else { 374 int field_index = entry->field_index(); 375 InlineKlass* field_ik = InlineKlass::cast(ik->get_inline_type_field_klass(field_index)); 376 field_ik->write_flat_field(new_value_h(), offset, ref_h(), CHECK_(ret_adj)); 377 } 378 } else { 379 new_value_h()->obj_field_put(offset, ref_h()); 380 } 381 } 382 break; 383 default: 384 ShouldNotReachHere(); 385 } 386 current->set_vm_result(new_value_h()); 387 return ret_adj; 388 JRT_END 389 390 JRT_ENTRY(void, InterpreterRuntime::uninitialized_static_inline_type_field(JavaThread* current, oopDesc* mirror, ResolvedFieldEntry* entry)) 391 // The interpreter tries to access an inline static field that has not been initialized. 392 // This situation can happen in different scenarios: 393 // 1 - if the load or initialization of the field failed during step 8 of 394 // the initialization of the holder of the field, in this case the access to the field 395 // must fail 396 // 2 - it can also happen when the initialization of the holder class triggered the initialization of 397 // another class which accesses this field in its static initializer, in this case the 398 // access must succeed to allow circularity 399 // The code below tries to load and initialize the field's class again before returning the default value. 400 // If the field was not initialized because of an error, an exception should be thrown. 401 // If the class is being initialized, the default value is returned. 402 assert(entry->is_valid(), "Invalid ResolvedFieldEntry"); 403 instanceHandle mirror_h(THREAD, (instanceOop)mirror); 404 InstanceKlass* klass = entry->field_holder(); 405 u2 index = entry->field_index(); 406 assert(klass == java_lang_Class::as_Klass(mirror), "Not the field holder klass"); 407 assert(klass->field_is_null_free_inline_type(index), "Sanity check"); 408 if (klass->is_being_initialized() && klass->is_init_thread(THREAD)) { 409 int offset = klass->field_offset(index); 410 Klass* field_k = klass->get_inline_type_field_klass_or_null(index); 411 if (field_k == nullptr) { 412 field_k = SystemDictionary::resolve_or_fail(klass->field_signature(index)->fundamental_name(THREAD), 413 Handle(THREAD, klass->class_loader()), 414 Handle(THREAD, klass->protection_domain()), 415 true, CHECK); 416 assert(field_k != nullptr, "Should have been loaded or an exception thrown above"); 417 klass->set_inline_type_field_klass(index, field_k); 418 } 419 field_k->initialize(CHECK); 420 oop defaultvalue = InlineKlass::cast(field_k)->default_value(); 421 // It is safe to initialize the static field because 1) the current thread is the initializing thread 422 // and is the only one that can access it, and 2) the field is actually not initialized (i.e. null) 423 // otherwise the JVM should not be executing this code. 424 mirror_h()->obj_field_put(offset, defaultvalue); 425 current->set_vm_result(defaultvalue); 426 } else { 427 assert(klass->is_in_error_state(), "If not initializing, initialization must have failed to get there"); 428 ResourceMark rm(THREAD); 429 const char* desc = "Could not initialize class "; 430 const char* className = klass->external_name(); 431 size_t msglen = strlen(desc) + strlen(className) + 1; 432 char* message = NEW_RESOURCE_ARRAY(char, msglen); 433 if (nullptr == message) { 434 // Out of memory: can't create detailed error message 435 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), className); 436 } else { 437 jio_snprintf(message, msglen, "%s%s", desc, className); 438 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), message); 439 } 440 } 441 JRT_END 442 443 JRT_ENTRY(void, InterpreterRuntime::read_flat_field(JavaThread* current, oopDesc* obj, int index, Klass* field_holder)) 444 Handle obj_h(THREAD, obj); 445 446 assert(oopDesc::is_oop(obj), "Sanity check"); 447 448 assert(field_holder->is_instance_klass(), "Sanity check"); 449 InstanceKlass* klass = InstanceKlass::cast(field_holder); 450 451 assert(klass->field_is_flat(index), "Sanity check"); 452 453 InlineKlass* field_vklass = InlineKlass::cast(klass->get_inline_type_field_klass(index)); 454 455 oop res = field_vklass->read_flat_field(obj_h(), klass->field_offset(index), CHECK); 456 current->set_vm_result(res); 457 JRT_END 458 459 JRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* current, BasicType type, jint size)) 460 oop obj = oopFactory::new_typeArray(type, size, CHECK); 461 current->set_vm_result(obj); 462 JRT_END 463 464 465 JRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* current, ConstantPool* pool, int index, jint size)) 466 Klass* klass = pool->klass_at(index, CHECK); 467 bool is_qtype_desc = pool->tag_at(index).is_Qdescriptor_klass(); 468 arrayOop obj; 469 if ((!klass->is_array_klass()) && is_qtype_desc) { // Logically creates elements, ensure klass init 470 klass->initialize(CHECK); 471 obj = oopFactory::new_valueArray(klass, size, CHECK); 472 } else { 473 obj = oopFactory::new_objArray(klass, size, CHECK); 474 } 475 current->set_vm_result(obj); 476 JRT_END 477 478 JRT_ENTRY(void, InterpreterRuntime::value_array_load(JavaThread* current, arrayOopDesc* array, int index)) 479 flatArrayHandle vah(current, (flatArrayOop)array); 480 oop value_holder = flatArrayOopDesc::value_alloc_copy_from_index(vah, index, CHECK); 481 current->set_vm_result(value_holder); 482 JRT_END 483 484 JRT_ENTRY(void, InterpreterRuntime::value_array_store(JavaThread* current, void* val, arrayOopDesc* array, int index)) 485 assert(val != nullptr, "can't store null into flat array"); 486 ((flatArrayOop)array)->value_copy_to_index(cast_to_oop(val), index); 487 JRT_END 488 489 JRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* current, jint* first_size_address)) 490 // We may want to pass in more arguments - could make this slightly faster 491 LastFrameAccessor last_frame(current); 492 ConstantPool* constants = last_frame.method()->constants(); 493 int i = last_frame.get_index_u2(Bytecodes::_multianewarray); 494 Klass* klass = constants->klass_at(i, CHECK); 495 bool is_qtype = klass->name()->is_Q_array_signature(); 496 int nof_dims = last_frame.number_of_dimensions(); 497 assert(klass->is_klass(), "not a class"); 498 assert(nof_dims >= 1, "multianewarray rank must be nonzero"); 499 500 if (is_qtype) { // Logically creates elements, ensure klass init 501 klass->initialize(CHECK); 502 } 503 504 // We must create an array of jints to pass to multi_allocate. 505 ResourceMark rm(current); 506 const int small_dims = 10; 507 jint dim_array[small_dims]; 508 jint *dims = &dim_array[0]; 509 if (nof_dims > small_dims) { 510 dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims); 511 } 512 for (int index = 0; index < nof_dims; index++) { 513 // offset from first_size_address is addressed as local[index] 514 int n = Interpreter::local_offset_in_bytes(index)/jintSize; 515 dims[index] = first_size_address[n]; 516 } 517 oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK); 518 current->set_vm_result(obj); 519 JRT_END 520 521 522 JRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* current, oopDesc* obj)) 523 assert(oopDesc::is_oop(obj), "must be a valid oop"); 524 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise"); 525 InstanceKlass::register_finalizer(instanceOop(obj), CHECK); 526 JRT_END 527 528 JRT_ENTRY(jboolean, InterpreterRuntime::is_substitutable(JavaThread* current, oopDesc* aobj, oopDesc* bobj)) 529 assert(oopDesc::is_oop(aobj) && oopDesc::is_oop(bobj), "must be valid oops"); 530 531 Handle ha(THREAD, aobj); 532 Handle hb(THREAD, bobj); 533 JavaValue result(T_BOOLEAN); 534 JavaCallArguments args; 535 args.push_oop(ha); 536 args.push_oop(hb); 537 methodHandle method(current, Universe::is_substitutable_method()); 538 JavaCalls::call(&result, method, &args, THREAD); 539 if (HAS_PENDING_EXCEPTION) { 540 // Something really bad happened because isSubstitutable() should not throw exceptions 541 // If it is an error, just let it propagate 542 // If it is an exception, wrap it into an InternalError 543 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) { 544 Handle e(THREAD, PENDING_EXCEPTION); 545 CLEAR_PENDING_EXCEPTION; 546 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in substitutability test", e, false); 547 } 548 } 549 return result.get_jboolean(); 550 JRT_END 551 552 // Quicken instance-of and check-cast bytecodes 553 JRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* current)) 554 // Force resolving; quicken the bytecode 555 LastFrameAccessor last_frame(current); 556 int which = last_frame.get_index_u2(Bytecodes::_checkcast); 557 ConstantPool* cpool = last_frame.method()->constants(); 558 // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded 559 // program we might have seen an unquick'd bytecode in the interpreter but have another 560 // thread quicken the bytecode before we get here. 561 // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" ); 562 Klass* klass = cpool->klass_at(which, CHECK); 563 current->set_vm_result_2(klass); 564 JRT_END 565 566 567 //------------------------------------------------------------------------------------------------------------------------ 568 // Exceptions 569 570 void InterpreterRuntime::note_trap_inner(JavaThread* current, int reason, 571 const methodHandle& trap_method, int trap_bci) { 572 if (trap_method.not_null()) { 573 MethodData* trap_mdo = trap_method->method_data(); 574 if (trap_mdo == nullptr) { 575 ExceptionMark em(current); 576 JavaThread* THREAD = current; // For exception macros. 577 Method::build_profiling_method_data(trap_method, THREAD); 578 if (HAS_PENDING_EXCEPTION) { 579 // Only metaspace OOM is expected. No Java code executed. 580 assert((PENDING_EXCEPTION->is_a(vmClasses::OutOfMemoryError_klass())), 581 "we expect only an OOM error here"); 582 CLEAR_PENDING_EXCEPTION; 583 } 584 trap_mdo = trap_method->method_data(); 585 // and fall through... 586 } 587 if (trap_mdo != nullptr) { 588 // Update per-method count of trap events. The interpreter 589 // is updating the MDO to simulate the effect of compiler traps. 590 Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason); 591 } 592 } 593 } 594 595 // Assume the compiler is (or will be) interested in this event. 596 // If necessary, create an MDO to hold the information, and record it. 597 void InterpreterRuntime::note_trap(JavaThread* current, int reason) { 598 assert(ProfileTraps, "call me only if profiling"); 599 LastFrameAccessor last_frame(current); 600 methodHandle trap_method(current, last_frame.method()); 601 int trap_bci = trap_method->bci_from(last_frame.bcp()); 602 note_trap_inner(current, reason, trap_method, trap_bci); 603 } 604 605 static Handle get_preinitialized_exception(Klass* k, TRAPS) { 606 // get klass 607 InstanceKlass* klass = InstanceKlass::cast(k); 608 assert(klass->is_initialized(), 609 "this klass should have been initialized during VM initialization"); 610 // create instance - do not call constructor since we may have no 611 // (java) stack space left (should assert constructor is empty) 612 Handle exception; 613 oop exception_oop = klass->allocate_instance(CHECK_(exception)); 614 exception = Handle(THREAD, exception_oop); 615 if (StackTraceInThrowable) { 616 java_lang_Throwable::fill_in_stack_trace(exception); 617 } 618 return exception; 619 } 620 621 // Special handling for stack overflow: since we don't have any (java) stack 622 // space left we use the pre-allocated & pre-initialized StackOverflowError 623 // klass to create an stack overflow error instance. We do not call its 624 // constructor for the same reason (it is empty, anyway). 625 JRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* current)) 626 Handle exception = get_preinitialized_exception( 627 vmClasses::StackOverflowError_klass(), 628 CHECK); 629 // Increment counter for hs_err file reporting 630 Atomic::inc(&Exceptions::_stack_overflow_errors); 631 // Remove the ScopedValue bindings in case we got a StackOverflowError 632 // while we were trying to manipulate ScopedValue bindings. 633 current->clear_scopedValueBindings(); 634 THROW_HANDLE(exception); 635 JRT_END 636 637 JRT_ENTRY(void, InterpreterRuntime::throw_delayed_StackOverflowError(JavaThread* current)) 638 Handle exception = get_preinitialized_exception( 639 vmClasses::StackOverflowError_klass(), 640 CHECK); 641 java_lang_Throwable::set_message(exception(), 642 Universe::delayed_stack_overflow_error_message()); 643 // Increment counter for hs_err file reporting 644 Atomic::inc(&Exceptions::_stack_overflow_errors); 645 // Remove the ScopedValue bindings in case we got a StackOverflowError 646 // while we were trying to manipulate ScopedValue bindings. 647 current->clear_scopedValueBindings(); 648 THROW_HANDLE(exception); 649 JRT_END 650 651 JRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* current, char* name, char* message)) 652 // lookup exception klass 653 TempNewSymbol s = SymbolTable::new_symbol(name); 654 if (ProfileTraps) { 655 if (s == vmSymbols::java_lang_ArithmeticException()) { 656 note_trap(current, Deoptimization::Reason_div0_check); 657 } else if (s == vmSymbols::java_lang_NullPointerException()) { 658 note_trap(current, Deoptimization::Reason_null_check); 659 } 660 } 661 // create exception 662 Handle exception = Exceptions::new_exception(current, s, message); 663 current->set_vm_result(exception()); 664 JRT_END 665 666 667 JRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* current, char* name, oopDesc* obj)) 668 // Produce the error message first because note_trap can safepoint 669 ResourceMark rm(current); 670 const char* klass_name = obj->klass()->external_name(); 671 // lookup exception klass 672 TempNewSymbol s = SymbolTable::new_symbol(name); 673 if (ProfileTraps) { 674 if (s == vmSymbols::java_lang_ArrayStoreException()) { 675 note_trap(current, Deoptimization::Reason_array_check); 676 } else { 677 note_trap(current, Deoptimization::Reason_class_check); 678 } 679 } 680 // create exception, with klass name as detail message 681 Handle exception = Exceptions::new_exception(current, s, klass_name); 682 current->set_vm_result(exception()); 683 JRT_END 684 685 JRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* current, arrayOopDesc* a, jint index)) 686 // Produce the error message first because note_trap can safepoint 687 ResourceMark rm(current); 688 stringStream ss; 689 ss.print("Index %d out of bounds for length %d", index, a->length()); 690 691 if (ProfileTraps) { 692 note_trap(current, Deoptimization::Reason_range_check); 693 } 694 695 THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), ss.as_string()); 696 JRT_END 697 698 JRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException( 699 JavaThread* current, oopDesc* obj)) 700 701 // Produce the error message first because note_trap can safepoint 702 ResourceMark rm(current); 703 char* message = SharedRuntime::generate_class_cast_message( 704 current, obj->klass()); 705 706 if (ProfileTraps) { 707 note_trap(current, Deoptimization::Reason_class_check); 708 } 709 710 // create exception 711 THROW_MSG(vmSymbols::java_lang_ClassCastException(), message); 712 JRT_END 713 714 // exception_handler_for_exception(...) returns the continuation address, 715 // the exception oop (via TLS) and sets the bci/bcp for the continuation. 716 // The exception oop is returned to make sure it is preserved over GC (it 717 // is only on the stack if the exception was thrown explicitly via athrow). 718 // During this operation, the expression stack contains the values for the 719 // bci where the exception happened. If the exception was propagated back 720 // from a call, the expression stack contains the values for the bci at the 721 // invoke w/o arguments (i.e., as if one were inside the call). 722 JRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* current, oopDesc* exception)) 723 // We get here after we have unwound from a callee throwing an exception 724 // into the interpreter. Any deferred stack processing is notified of 725 // the event via the StackWatermarkSet. 726 StackWatermarkSet::after_unwind(current); 727 728 LastFrameAccessor last_frame(current); 729 Handle h_exception(current, exception); 730 methodHandle h_method (current, last_frame.method()); 731 constantPoolHandle h_constants(current, h_method->constants()); 732 bool should_repeat; 733 int handler_bci; 734 int current_bci = last_frame.bci(); 735 736 if (current->frames_to_pop_failed_realloc() > 0) { 737 // Allocation of scalar replaced object used in this frame 738 // failed. Unconditionally pop the frame. 739 current->dec_frames_to_pop_failed_realloc(); 740 current->set_vm_result(h_exception()); 741 // If the method is synchronized we already unlocked the monitor 742 // during deoptimization so the interpreter needs to skip it when 743 // the frame is popped. 744 current->set_do_not_unlock_if_synchronized(true); 745 return Interpreter::remove_activation_entry(); 746 } 747 748 // Need to do this check first since when _do_not_unlock_if_synchronized 749 // is set, we don't want to trigger any classloading which may make calls 750 // into java, or surprisingly find a matching exception handler for bci 0 751 // since at this moment the method hasn't been "officially" entered yet. 752 if (current->do_not_unlock_if_synchronized()) { 753 ResourceMark rm; 754 assert(current_bci == 0, "bci isn't zero for do_not_unlock_if_synchronized"); 755 current->set_vm_result(exception); 756 return Interpreter::remove_activation_entry(); 757 } 758 759 do { 760 should_repeat = false; 761 762 // assertions 763 assert(h_exception.not_null(), "null exceptions should be handled by athrow"); 764 // Check that exception is a subclass of Throwable. 765 assert(h_exception->is_a(vmClasses::Throwable_klass()), 766 "Exception not subclass of Throwable"); 767 768 // tracing 769 if (log_is_enabled(Info, exceptions)) { 770 ResourceMark rm(current); 771 stringStream tempst; 772 tempst.print("interpreter method <%s>\n" 773 " at bci %d for thread " INTPTR_FORMAT " (%s)", 774 h_method->print_value_string(), current_bci, p2i(current), current->name()); 775 Exceptions::log_exception(h_exception, tempst.as_string()); 776 } 777 // Don't go paging in something which won't be used. 778 // else if (extable->length() == 0) { 779 // // disabled for now - interpreter is not using shortcut yet 780 // // (shortcut is not to call runtime if we have no exception handlers) 781 // // warning("performance bug: should not call runtime if method has no exception handlers"); 782 // } 783 // for AbortVMOnException flag 784 Exceptions::debug_check_abort(h_exception); 785 786 // exception handler lookup 787 Klass* klass = h_exception->klass(); 788 handler_bci = Method::fast_exception_handler_bci_for(h_method, klass, current_bci, THREAD); 789 if (HAS_PENDING_EXCEPTION) { 790 // We threw an exception while trying to find the exception handler. 791 // Transfer the new exception to the exception handle which will 792 // be set into thread local storage, and do another lookup for an 793 // exception handler for this exception, this time starting at the 794 // BCI of the exception handler which caused the exception to be 795 // thrown (bug 4307310). 796 h_exception = Handle(THREAD, PENDING_EXCEPTION); 797 CLEAR_PENDING_EXCEPTION; 798 if (handler_bci >= 0) { 799 current_bci = handler_bci; 800 should_repeat = true; 801 } 802 } 803 } while (should_repeat == true); 804 805 #if INCLUDE_JVMCI 806 if (EnableJVMCI && h_method->method_data() != nullptr) { 807 ResourceMark rm(current); 808 ProfileData* pdata = h_method->method_data()->allocate_bci_to_data(current_bci, nullptr); 809 if (pdata != nullptr && pdata->is_BitData()) { 810 BitData* bit_data = (BitData*) pdata; 811 bit_data->set_exception_seen(); 812 } 813 } 814 #endif 815 816 // notify JVMTI of an exception throw; JVMTI will detect if this is a first 817 // time throw or a stack unwinding throw and accordingly notify the debugger 818 if (JvmtiExport::can_post_on_exceptions()) { 819 JvmtiExport::post_exception_throw(current, h_method(), last_frame.bcp(), h_exception()); 820 } 821 822 address continuation = nullptr; 823 address handler_pc = nullptr; 824 if (handler_bci < 0 || !current->stack_overflow_state()->reguard_stack((address) &continuation)) { 825 // Forward exception to callee (leaving bci/bcp untouched) because (a) no 826 // handler in this method, or (b) after a stack overflow there is not yet 827 // enough stack space available to reprotect the stack. 828 continuation = Interpreter::remove_activation_entry(); 829 #if COMPILER2_OR_JVMCI 830 // Count this for compilation purposes 831 h_method->interpreter_throwout_increment(THREAD); 832 #endif 833 } else { 834 // handler in this method => change bci/bcp to handler bci/bcp and continue there 835 handler_pc = h_method->code_base() + handler_bci; 836 #ifndef ZERO 837 set_bcp_and_mdp(handler_pc, current); 838 continuation = Interpreter::dispatch_table(vtos)[*handler_pc]; 839 #else 840 continuation = (address)(intptr_t) handler_bci; 841 #endif 842 } 843 844 // notify debugger of an exception catch 845 // (this is good for exceptions caught in native methods as well) 846 if (JvmtiExport::can_post_on_exceptions()) { 847 JvmtiExport::notice_unwind_due_to_exception(current, h_method(), handler_pc, h_exception(), (handler_pc != nullptr)); 848 } 849 850 current->set_vm_result(h_exception()); 851 return continuation; 852 JRT_END 853 854 855 JRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* current)) 856 assert(current->has_pending_exception(), "must only be called if there's an exception pending"); 857 // nothing to do - eventually we should remove this code entirely (see comments @ call sites) 858 JRT_END 859 860 861 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* current)) 862 THROW(vmSymbols::java_lang_AbstractMethodError()); 863 JRT_END 864 865 // This method is called from the "abstract_entry" of the interpreter. 866 // At that point, the arguments have already been removed from the stack 867 // and therefore we don't have the receiver object at our fingertips. (Though, 868 // on some platforms the receiver still resides in a register...). Thus, 869 // we have no choice but print an error message not containing the receiver 870 // type. 871 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorWithMethod(JavaThread* current, 872 Method* missingMethod)) 873 ResourceMark rm(current); 874 assert(missingMethod != nullptr, "sanity"); 875 methodHandle m(current, missingMethod); 876 LinkResolver::throw_abstract_method_error(m, THREAD); 877 JRT_END 878 879 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorVerbose(JavaThread* current, 880 Klass* recvKlass, 881 Method* missingMethod)) 882 ResourceMark rm(current); 883 methodHandle mh = methodHandle(current, missingMethod); 884 LinkResolver::throw_abstract_method_error(mh, recvKlass, THREAD); 885 JRT_END 886 887 JRT_ENTRY(void, InterpreterRuntime::throw_InstantiationError(JavaThread* current)) 888 THROW(vmSymbols::java_lang_InstantiationError()); 889 JRT_END 890 891 892 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* current)) 893 THROW(vmSymbols::java_lang_IncompatibleClassChangeError()); 894 JRT_END 895 896 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeErrorVerbose(JavaThread* current, 897 Klass* recvKlass, 898 Klass* interfaceKlass)) 899 ResourceMark rm(current); 900 char buf[1000]; 901 buf[0] = '\0'; 902 jio_snprintf(buf, sizeof(buf), 903 "Class %s does not implement the requested interface %s", 904 recvKlass ? recvKlass->external_name() : "nullptr", 905 interfaceKlass ? interfaceKlass->external_name() : "nullptr"); 906 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 907 JRT_END 908 909 JRT_ENTRY(void, InterpreterRuntime::throw_NullPointerException(JavaThread* current)) 910 THROW(vmSymbols::java_lang_NullPointerException()); 911 JRT_END 912 913 //------------------------------------------------------------------------------------------------------------------------ 914 // Fields 915 // 916 917 void InterpreterRuntime::resolve_get_put(JavaThread* current, Bytecodes::Code bytecode) { 918 // resolve field 919 fieldDescriptor info; 920 LastFrameAccessor last_frame(current); 921 constantPoolHandle pool(current, last_frame.method()->constants()); 922 methodHandle m(current, last_frame.method()); 923 bool is_put = (bytecode == Bytecodes::_putfield || bytecode == Bytecodes::_nofast_putfield || 924 bytecode == Bytecodes::_putstatic || bytecode == Bytecodes::_withfield); 925 bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic); 926 bool is_inline_type = bytecode == Bytecodes::_withfield; 927 928 int field_index = last_frame.get_index_u2(bytecode); 929 { 930 JvmtiHideSingleStepping jhss(current); 931 JavaThread* THREAD = current; // For exception macros. 932 LinkResolver::resolve_field_access(info, pool, field_index, 933 m, bytecode, CHECK); 934 } // end JvmtiHideSingleStepping 935 936 // check if link resolution caused cpCache to be updated 937 if (pool->resolved_field_entry_at(field_index)->is_resolved(bytecode)) return; 938 939 940 // compute auxiliary field attributes 941 TosState state = as_TosState(info.field_type()); 942 943 // Resolution of put instructions on final fields is delayed. That is required so that 944 // exceptions are thrown at the correct place (when the instruction is actually invoked). 945 // If we do not resolve an instruction in the current pass, leaving the put_code 946 // set to zero will cause the next put instruction to the same field to reresolve. 947 948 // Resolution of put instructions to final instance fields with invalid updates (i.e., 949 // to final instance fields with updates originating from a method different than <init>) 950 // is inhibited. A putfield instruction targeting an instance final field must throw 951 // an IllegalAccessError if the instruction is not in an instance 952 // initializer method <init>. If resolution were not inhibited, a putfield 953 // in an initializer method could be resolved in the initializer. Subsequent 954 // putfield instructions to the same field would then use cached information. 955 // As a result, those instructions would not pass through the VM. That is, 956 // checks in resolve_field_access() would not be executed for those instructions 957 // and the required IllegalAccessError would not be thrown. 958 // 959 // Also, we need to delay resolving getstatic and putstatic instructions until the 960 // class is initialized. This is required so that access to the static 961 // field will call the initialization function every time until the class 962 // is completely initialized ala. in 2.17.5 in JVM Specification. 963 InstanceKlass* klass = info.field_holder(); 964 bool uninitialized_static = is_static && !klass->is_initialized(); 965 bool has_initialized_final_update = info.field_holder()->major_version() >= 53 && 966 info.has_initialized_final_update(); 967 assert(!(has_initialized_final_update && !info.access_flags().is_final()), "Fields with initialized final updates must be final"); 968 969 Bytecodes::Code get_code = (Bytecodes::Code)0; 970 Bytecodes::Code put_code = (Bytecodes::Code)0; 971 if (!uninitialized_static) { 972 if (is_static) { 973 get_code = Bytecodes::_getstatic; 974 } else { 975 get_code = Bytecodes::_getfield; 976 } 977 if (is_put && is_inline_type) { 978 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_withfield); 979 } else if ((is_put && !has_initialized_final_update) || !info.access_flags().is_final()) { 980 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield); 981 } 982 } 983 984 ResolvedFieldEntry* entry = pool->resolved_field_entry_at(field_index); 985 entry->set_flags(info.access_flags().is_final(), info.access_flags().is_volatile(), 986 info.is_flat(), info.is_null_free_inline_type()); 987 entry->fill_in(info.field_holder(), info.offset(), 988 checked_cast<u2>(info.index()), checked_cast<u1>(state), 989 static_cast<u1>(get_code), static_cast<u1>(put_code)); 990 } 991 992 993 //------------------------------------------------------------------------------------------------------------------------ 994 // Synchronization 995 // 996 // The interpreter's synchronization code is factored out so that it can 997 // be shared by method invocation and synchronized blocks. 998 //%note synchronization_3 999 1000 //%note monitor_1 1001 JRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* current, BasicObjectLock* elem)) 1002 assert(LockingMode != LM_LIGHTWEIGHT, "Should call monitorenter_obj() when using the new lightweight locking"); 1003 #ifdef ASSERT 1004 current->last_frame().interpreter_frame_verify_monitor(elem); 1005 #endif 1006 Handle h_obj(current, elem->obj()); 1007 assert(Universe::heap()->is_in_or_null(h_obj()), 1008 "must be null or an object"); 1009 ObjectSynchronizer::enter(h_obj, elem->lock(), current); 1010 assert(Universe::heap()->is_in_or_null(elem->obj()), 1011 "must be null or an object"); 1012 #ifdef ASSERT 1013 current->last_frame().interpreter_frame_verify_monitor(elem); 1014 #endif 1015 JRT_END 1016 1017 // NOTE: We provide a separate implementation for the new lightweight locking to workaround a limitation 1018 // of registers in x86_32. This entry point accepts an oop instead of a BasicObjectLock*. 1019 // The problem is that we would need to preserve the register that holds the BasicObjectLock, 1020 // but we are using that register to hold the thread. We don't have enough registers to 1021 // also keep the BasicObjectLock, but we don't really need it anyway, we only need 1022 // the object. See also InterpreterMacroAssembler::lock_object(). 1023 // As soon as legacy stack-locking goes away we could remove the other monitorenter() entry 1024 // point, and only use oop-accepting entries (same for monitorexit() below). 1025 JRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter_obj(JavaThread* current, oopDesc* obj)) 1026 assert(LockingMode == LM_LIGHTWEIGHT, "Should call monitorenter() when not using the new lightweight locking"); 1027 Handle h_obj(current, cast_to_oop(obj)); 1028 assert(Universe::heap()->is_in_or_null(h_obj()), 1029 "must be null or an object"); 1030 ObjectSynchronizer::enter(h_obj, nullptr, current); 1031 return; 1032 JRT_END 1033 1034 JRT_LEAF(void, InterpreterRuntime::monitorexit(BasicObjectLock* elem)) 1035 oop obj = elem->obj(); 1036 assert(Universe::heap()->is_in(obj), "must be an object"); 1037 // The object could become unlocked through a JNI call, which we have no other checks for. 1038 // Give a fatal message if CheckJNICalls. Otherwise we ignore it. 1039 if (obj->is_unlocked()) { 1040 if (CheckJNICalls) { 1041 fatal("Object has been unlocked by JNI"); 1042 } 1043 return; 1044 } 1045 ObjectSynchronizer::exit(obj, elem->lock(), JavaThread::current()); 1046 // Free entry. If it is not cleared, the exception handling code will try to unlock the monitor 1047 // again at method exit or in the case of an exception. 1048 elem->set_obj(nullptr); 1049 JRT_END 1050 1051 1052 JRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* current)) 1053 THROW(vmSymbols::java_lang_IllegalMonitorStateException()); 1054 JRT_END 1055 1056 1057 JRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* current)) 1058 // Returns an illegal exception to install into the current thread. The 1059 // pending_exception flag is cleared so normal exception handling does not 1060 // trigger. Any current installed exception will be overwritten. This 1061 // method will be called during an exception unwind. 1062 1063 assert(!HAS_PENDING_EXCEPTION, "no pending exception"); 1064 Handle exception(current, current->vm_result()); 1065 assert(exception() != nullptr, "vm result should be set"); 1066 current->set_vm_result(nullptr); // clear vm result before continuing (may cause memory leaks and assert failures) 1067 exception = get_preinitialized_exception(vmClasses::IllegalMonitorStateException_klass(), CATCH); 1068 current->set_vm_result(exception()); 1069 JRT_END 1070 1071 1072 //------------------------------------------------------------------------------------------------------------------------ 1073 // Invokes 1074 1075 JRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* current, Method* method, address bcp)) 1076 return method->orig_bytecode_at(method->bci_from(bcp)); 1077 JRT_END 1078 1079 JRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* current, Method* method, address bcp, Bytecodes::Code new_code)) 1080 method->set_orig_bytecode_at(method->bci_from(bcp), new_code); 1081 JRT_END 1082 1083 JRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* current, Method* method, address bcp)) 1084 JvmtiExport::post_raw_breakpoint(current, method, bcp); 1085 JRT_END 1086 1087 void InterpreterRuntime::resolve_invoke(JavaThread* current, Bytecodes::Code bytecode) { 1088 LastFrameAccessor last_frame(current); 1089 // extract receiver from the outgoing argument list if necessary 1090 Handle receiver(current, nullptr); 1091 if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface || 1092 bytecode == Bytecodes::_invokespecial) { 1093 ResourceMark rm(current); 1094 methodHandle m (current, last_frame.method()); 1095 Bytecode_invoke call(m, last_frame.bci()); 1096 Symbol* signature = call.signature(); 1097 receiver = Handle(current, last_frame.callee_receiver(signature)); 1098 1099 assert(Universe::heap()->is_in_or_null(receiver()), 1100 "sanity check"); 1101 assert(receiver.is_null() || 1102 !Universe::heap()->is_in(receiver->klass()), 1103 "sanity check"); 1104 } 1105 1106 // resolve method 1107 CallInfo info; 1108 constantPoolHandle pool(current, last_frame.method()->constants()); 1109 1110 methodHandle resolved_method; 1111 1112 { 1113 JvmtiHideSingleStepping jhss(current); 1114 JavaThread* THREAD = current; // For exception macros. 1115 LinkResolver::resolve_invoke(info, receiver, pool, 1116 last_frame.get_index_u2_cpcache(bytecode), bytecode, 1117 THREAD); 1118 1119 if (HAS_PENDING_EXCEPTION) { 1120 if (ProfileTraps && PENDING_EXCEPTION->klass()->name() == vmSymbols::java_lang_NullPointerException()) { 1121 // Preserve the original exception across the call to note_trap() 1122 PreserveExceptionMark pm(current); 1123 // Recording the trap will help the compiler to potentially recognize this exception as "hot" 1124 note_trap(current, Deoptimization::Reason_null_check); 1125 } 1126 return; 1127 } 1128 1129 if (JvmtiExport::can_hotswap_or_post_breakpoint() && info.resolved_method()->is_old()) { 1130 resolved_method = methodHandle(current, info.resolved_method()->get_new_method()); 1131 } else { 1132 resolved_method = methodHandle(current, info.resolved_method()); 1133 } 1134 } // end JvmtiHideSingleStepping 1135 1136 // check if link resolution caused cpCache to be updated 1137 ConstantPoolCacheEntry* cp_cache_entry = last_frame.cache_entry(); 1138 if (cp_cache_entry->is_resolved(bytecode)) return; 1139 1140 #ifdef ASSERT 1141 if (bytecode == Bytecodes::_invokeinterface) { 1142 if (resolved_method->method_holder() == vmClasses::Object_klass()) { 1143 // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec 1144 // (see also CallInfo::set_interface for details) 1145 assert(info.call_kind() == CallInfo::vtable_call || 1146 info.call_kind() == CallInfo::direct_call, ""); 1147 assert(resolved_method->is_final() || info.has_vtable_index(), 1148 "should have been set already"); 1149 } else if (!resolved_method->has_itable_index()) { 1150 // Resolved something like CharSequence.toString. Use vtable not itable. 1151 assert(info.call_kind() != CallInfo::itable_call, ""); 1152 } else { 1153 // Setup itable entry 1154 assert(info.call_kind() == CallInfo::itable_call, ""); 1155 int index = resolved_method->itable_index(); 1156 assert(info.itable_index() == index, ""); 1157 } 1158 } else if (bytecode == Bytecodes::_invokespecial) { 1159 assert(info.call_kind() == CallInfo::direct_call, "must be direct call"); 1160 } else { 1161 assert(info.call_kind() == CallInfo::direct_call || 1162 info.call_kind() == CallInfo::vtable_call, ""); 1163 } 1164 #endif 1165 // Get sender and only set cpCache entry to resolved if it is not an 1166 // interface. The receiver for invokespecial calls within interface 1167 // methods must be checked for every call. 1168 InstanceKlass* sender = pool->pool_holder(); 1169 1170 switch (info.call_kind()) { 1171 case CallInfo::direct_call: 1172 cp_cache_entry->set_direct_call( 1173 bytecode, 1174 resolved_method, 1175 sender->is_interface()); 1176 break; 1177 case CallInfo::vtable_call: 1178 cp_cache_entry->set_vtable_call( 1179 bytecode, 1180 resolved_method, 1181 info.vtable_index()); 1182 break; 1183 case CallInfo::itable_call: 1184 cp_cache_entry->set_itable_call( 1185 bytecode, 1186 info.resolved_klass(), 1187 resolved_method, 1188 info.itable_index()); 1189 break; 1190 default: ShouldNotReachHere(); 1191 } 1192 } 1193 1194 1195 // First time execution: Resolve symbols, create a permanent MethodType object. 1196 void InterpreterRuntime::resolve_invokehandle(JavaThread* current) { 1197 const Bytecodes::Code bytecode = Bytecodes::_invokehandle; 1198 LastFrameAccessor last_frame(current); 1199 1200 // resolve method 1201 CallInfo info; 1202 constantPoolHandle pool(current, last_frame.method()->constants()); 1203 { 1204 JvmtiHideSingleStepping jhss(current); 1205 JavaThread* THREAD = current; // For exception macros. 1206 LinkResolver::resolve_invoke(info, Handle(), pool, 1207 last_frame.get_index_u2_cpcache(bytecode), bytecode, 1208 CHECK); 1209 } // end JvmtiHideSingleStepping 1210 1211 ConstantPoolCacheEntry* cp_cache_entry = last_frame.cache_entry(); 1212 cp_cache_entry->set_method_handle(pool, info); 1213 } 1214 1215 // First time execution: Resolve symbols, create a permanent CallSite object. 1216 void InterpreterRuntime::resolve_invokedynamic(JavaThread* current) { 1217 LastFrameAccessor last_frame(current); 1218 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic; 1219 1220 // resolve method 1221 CallInfo info; 1222 constantPoolHandle pool(current, last_frame.method()->constants()); 1223 int index = last_frame.get_index_u4(bytecode); 1224 { 1225 JvmtiHideSingleStepping jhss(current); 1226 JavaThread* THREAD = current; // For exception macros. 1227 LinkResolver::resolve_invoke(info, Handle(), pool, 1228 index, bytecode, CHECK); 1229 } // end JvmtiHideSingleStepping 1230 1231 pool->cache()->set_dynamic_call(info, pool->decode_invokedynamic_index(index)); 1232 } 1233 1234 // This function is the interface to the assembly code. It returns the resolved 1235 // cpCache entry. This doesn't safepoint, but the helper routines safepoint. 1236 // This function will check for redefinition! 1237 JRT_ENTRY(void, InterpreterRuntime::resolve_from_cache(JavaThread* current, Bytecodes::Code bytecode)) { 1238 switch (bytecode) { 1239 case Bytecodes::_getstatic: 1240 case Bytecodes::_putstatic: 1241 case Bytecodes::_getfield: 1242 case Bytecodes::_putfield: 1243 case Bytecodes::_withfield: 1244 resolve_get_put(current, bytecode); 1245 break; 1246 case Bytecodes::_invokevirtual: 1247 case Bytecodes::_invokespecial: 1248 case Bytecodes::_invokestatic: 1249 case Bytecodes::_invokeinterface: 1250 resolve_invoke(current, bytecode); 1251 break; 1252 case Bytecodes::_invokehandle: 1253 resolve_invokehandle(current); 1254 break; 1255 case Bytecodes::_invokedynamic: 1256 resolve_invokedynamic(current); 1257 break; 1258 default: 1259 fatal("unexpected bytecode: %s", Bytecodes::name(bytecode)); 1260 break; 1261 } 1262 } 1263 JRT_END 1264 1265 //------------------------------------------------------------------------------------------------------------------------ 1266 // Miscellaneous 1267 1268 1269 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* current, address branch_bcp) { 1270 // Enable WXWrite: the function is called directly by interpreter. 1271 MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXWrite, current)); 1272 1273 // frequency_counter_overflow_inner can throw async exception. 1274 nmethod* nm = frequency_counter_overflow_inner(current, branch_bcp); 1275 assert(branch_bcp != nullptr || nm == nullptr, "always returns null for non OSR requests"); 1276 if (branch_bcp != nullptr && nm != nullptr) { 1277 // This was a successful request for an OSR nmethod. Because 1278 // frequency_counter_overflow_inner ends with a safepoint check, 1279 // nm could have been unloaded so look it up again. It's unsafe 1280 // to examine nm directly since it might have been freed and used 1281 // for something else. 1282 LastFrameAccessor last_frame(current); 1283 Method* method = last_frame.method(); 1284 int bci = method->bci_from(last_frame.bcp()); 1285 nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false); 1286 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod(); 1287 if (nm != nullptr && bs_nm != nullptr) { 1288 // in case the transition passed a safepoint we need to barrier this again 1289 if (!bs_nm->nmethod_osr_entry_barrier(nm)) { 1290 nm = nullptr; 1291 } 1292 } 1293 } 1294 if (nm != nullptr && current->is_interp_only_mode()) { 1295 // Normally we never get an nm if is_interp_only_mode() is true, because 1296 // policy()->event has a check for this and won't compile the method when 1297 // true. However, it's possible for is_interp_only_mode() to become true 1298 // during the compilation. We don't want to return the nm in that case 1299 // because we want to continue to execute interpreted. 1300 nm = nullptr; 1301 } 1302 #ifndef PRODUCT 1303 if (TraceOnStackReplacement) { 1304 if (nm != nullptr) { 1305 tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", p2i(nm->osr_entry())); 1306 nm->print(); 1307 } 1308 } 1309 #endif 1310 return nm; 1311 } 1312 1313 JRT_ENTRY(nmethod*, 1314 InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* current, address branch_bcp)) 1315 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized 1316 // flag, in case this method triggers classloading which will call into Java. 1317 UnlockFlagSaver fs(current); 1318 1319 LastFrameAccessor last_frame(current); 1320 assert(last_frame.is_interpreted_frame(), "must come from interpreter"); 1321 methodHandle method(current, last_frame.method()); 1322 const int branch_bci = branch_bcp != nullptr ? method->bci_from(branch_bcp) : InvocationEntryBci; 1323 const int bci = branch_bcp != nullptr ? method->bci_from(last_frame.bcp()) : InvocationEntryBci; 1324 1325 nmethod* osr_nm = CompilationPolicy::event(method, method, branch_bci, bci, CompLevel_none, nullptr, CHECK_NULL); 1326 1327 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod(); 1328 if (osr_nm != nullptr && bs_nm != nullptr) { 1329 if (!bs_nm->nmethod_osr_entry_barrier(osr_nm)) { 1330 osr_nm = nullptr; 1331 } 1332 } 1333 return osr_nm; 1334 JRT_END 1335 1336 JRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp)) 1337 assert(ProfileInterpreter, "must be profiling interpreter"); 1338 int bci = method->bci_from(cur_bcp); 1339 MethodData* mdo = method->method_data(); 1340 if (mdo == nullptr) return 0; 1341 return mdo->bci_to_di(bci); 1342 JRT_END 1343 1344 #ifdef ASSERT 1345 JRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp)) 1346 assert(ProfileInterpreter, "must be profiling interpreter"); 1347 1348 MethodData* mdo = method->method_data(); 1349 assert(mdo != nullptr, "must not be null"); 1350 1351 int bci = method->bci_from(bcp); 1352 1353 address mdp2 = mdo->bci_to_dp(bci); 1354 if (mdp != mdp2) { 1355 ResourceMark rm; 1356 tty->print_cr("FAILED verify : actual mdp %p expected mdp %p @ bci %d", mdp, mdp2, bci); 1357 int current_di = mdo->dp_to_di(mdp); 1358 int expected_di = mdo->dp_to_di(mdp2); 1359 tty->print_cr(" actual di %d expected di %d", current_di, expected_di); 1360 int expected_approx_bci = mdo->data_at(expected_di)->bci(); 1361 int approx_bci = -1; 1362 if (current_di >= 0) { 1363 approx_bci = mdo->data_at(current_di)->bci(); 1364 } 1365 tty->print_cr(" actual bci is %d expected bci %d", approx_bci, expected_approx_bci); 1366 mdo->print_on(tty); 1367 method->print_codes(); 1368 } 1369 assert(mdp == mdp2, "wrong mdp"); 1370 JRT_END 1371 #endif // ASSERT 1372 1373 JRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* current, int return_bci)) 1374 assert(ProfileInterpreter, "must be profiling interpreter"); 1375 ResourceMark rm(current); 1376 LastFrameAccessor last_frame(current); 1377 assert(last_frame.is_interpreted_frame(), "must come from interpreter"); 1378 MethodData* h_mdo = last_frame.method()->method_data(); 1379 1380 // Grab a lock to ensure atomic access to setting the return bci and 1381 // the displacement. This can block and GC, invalidating all naked oops. 1382 MutexLocker ml(RetData_lock); 1383 1384 // ProfileData is essentially a wrapper around a derived oop, so we 1385 // need to take the lock before making any ProfileData structures. 1386 ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(last_frame.mdp())); 1387 guarantee(data != nullptr, "profile data must be valid"); 1388 RetData* rdata = data->as_RetData(); 1389 address new_mdp = rdata->fixup_ret(return_bci, h_mdo); 1390 last_frame.set_mdp(new_mdp); 1391 JRT_END 1392 1393 JRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* current, Method* m)) 1394 return Method::build_method_counters(current, m); 1395 JRT_END 1396 1397 1398 JRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* current)) 1399 // We used to need an explicit preserve_arguments here for invoke bytecodes. However, 1400 // stack traversal automatically takes care of preserving arguments for invoke, so 1401 // this is no longer needed. 1402 1403 // JRT_END does an implicit safepoint check, hence we are guaranteed to block 1404 // if this is called during a safepoint 1405 1406 if (JvmtiExport::should_post_single_step()) { 1407 // This function is called by the interpreter when single stepping. Such single 1408 // stepping could unwind a frame. Then, it is important that we process any frames 1409 // that we might return into. 1410 StackWatermarkSet::before_unwind(current); 1411 1412 // We are called during regular safepoints and when the VM is 1413 // single stepping. If any thread is marked for single stepping, 1414 // then we may have JVMTI work to do. 1415 LastFrameAccessor last_frame(current); 1416 JvmtiExport::at_single_stepping_point(current, last_frame.method(), last_frame.bcp()); 1417 } 1418 JRT_END 1419 1420 JRT_LEAF(void, InterpreterRuntime::at_unwind(JavaThread* current)) 1421 assert(current == JavaThread::current(), "pre-condition"); 1422 // This function is called by the interpreter when the return poll found a reason 1423 // to call the VM. The reason could be that we are returning into a not yet safe 1424 // to access frame. We handle that below. 1425 // Note that this path does not check for single stepping, because we do not want 1426 // to single step when unwinding frames for an exception being thrown. Instead, 1427 // such single stepping code will use the safepoint table, which will use the 1428 // InterpreterRuntime::at_safepoint callback. 1429 StackWatermarkSet::before_unwind(current); 1430 JRT_END 1431 1432 JRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread* current, oopDesc* obj, 1433 ResolvedFieldEntry *entry)) 1434 1435 assert(entry->is_valid(), "Invalid ResolvedFieldEntry"); 1436 // check the access_flags for the field in the klass 1437 1438 InstanceKlass* ik = entry->field_holder(); 1439 int index = entry->field_index(); 1440 if (!ik->field_status(index).is_access_watched()) return; 1441 1442 bool is_static = (obj == nullptr); 1443 bool is_flat = entry->is_flat(); 1444 HandleMark hm(current); 1445 1446 Handle h_obj; 1447 if (!is_static) { 1448 // non-static field accessors have an object, but we need a handle 1449 h_obj = Handle(current, obj); 1450 } 1451 InstanceKlass* field_holder = entry->field_holder(); // HERE 1452 jfieldID fid = jfieldIDWorkaround::to_jfieldID(field_holder, entry->field_offset(), is_static, is_flat); 1453 LastFrameAccessor last_frame(current); 1454 JvmtiExport::post_field_access(current, last_frame.method(), last_frame.bcp(), field_holder, h_obj, fid); 1455 JRT_END 1456 1457 JRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread* current, oopDesc* obj, 1458 ResolvedFieldEntry *entry, jvalue *value)) 1459 1460 assert(entry->is_valid(), "Invalid ResolvedFieldEntry"); 1461 InstanceKlass* ik = entry->field_holder(); 1462 1463 // check the access_flags for the field in the klass 1464 int index = entry->field_index(); 1465 // bail out if field modifications are not watched 1466 if (!ik->field_status(index).is_modification_watched()) return; 1467 1468 char sig_type = '\0'; 1469 1470 switch((TosState)entry->tos_state()) { 1471 case btos: sig_type = JVM_SIGNATURE_BYTE; break; 1472 case ztos: sig_type = JVM_SIGNATURE_BOOLEAN; break; 1473 case ctos: sig_type = JVM_SIGNATURE_CHAR; break; 1474 case stos: sig_type = JVM_SIGNATURE_SHORT; break; 1475 case itos: sig_type = JVM_SIGNATURE_INT; break; 1476 case ftos: sig_type = JVM_SIGNATURE_FLOAT; break; 1477 case atos: sig_type = JVM_SIGNATURE_CLASS; break; 1478 case ltos: sig_type = JVM_SIGNATURE_LONG; break; 1479 case dtos: sig_type = JVM_SIGNATURE_DOUBLE; break; 1480 default: ShouldNotReachHere(); return; 1481 } 1482 1483 // Both Q-signatures and L-signatures are mapped to atos 1484 ik->field_is_null_free_inline_type(index); 1485 if (entry->tos_state() == atos && ik->field_is_null_free_inline_type(index)) { 1486 sig_type = JVM_SIGNATURE_PRIMITIVE_OBJECT; 1487 } 1488 1489 bool is_static = (obj == nullptr); 1490 bool is_flat = entry->is_flat(); 1491 1492 HandleMark hm(current); 1493 jfieldID fid = jfieldIDWorkaround::to_jfieldID(ik, entry->field_offset(), is_static, is_flat); 1494 jvalue fvalue; 1495 #ifdef _LP64 1496 fvalue = *value; 1497 #else 1498 // Long/double values are stored unaligned and also noncontiguously with 1499 // tagged stacks. We can't just do a simple assignment even in the non- 1500 // J/D cases because a C++ compiler is allowed to assume that a jvalue is 1501 // 8-byte aligned, and interpreter stack slots are only 4-byte aligned. 1502 // We assume that the two halves of longs/doubles are stored in interpreter 1503 // stack slots in platform-endian order. 1504 jlong_accessor u; 1505 jint* newval = (jint*)value; 1506 u.words[0] = newval[0]; 1507 u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag 1508 fvalue.j = u.long_value; 1509 #endif // _LP64 1510 1511 Handle h_obj; 1512 if (!is_static) { 1513 // non-static field accessors have an object, but we need a handle 1514 h_obj = Handle(current, obj); 1515 } 1516 1517 LastFrameAccessor last_frame(current); 1518 JvmtiExport::post_raw_field_modification(current, last_frame.method(), last_frame.bcp(), ik, h_obj, 1519 fid, sig_type, &fvalue); 1520 JRT_END 1521 1522 JRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread* current)) 1523 LastFrameAccessor last_frame(current); 1524 JvmtiExport::post_method_entry(current, last_frame.method(), last_frame.get_frame()); 1525 JRT_END 1526 1527 1528 // This is a JRT_BLOCK_ENTRY because we have to stash away the return oop 1529 // before transitioning to VM, and restore it after transitioning back 1530 // to Java. The return oop at the top-of-stack, is not walked by the GC. 1531 JRT_BLOCK_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread* current)) 1532 LastFrameAccessor last_frame(current); 1533 JvmtiExport::post_method_exit(current, last_frame.method(), last_frame.get_frame()); 1534 JRT_END 1535 1536 JRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc)) 1537 { 1538 return (Interpreter::contains(Continuation::get_top_return_pc_post_barrier(JavaThread::current(), pc)) ? 1 : 0); 1539 } 1540 JRT_END 1541 1542 1543 // Implementation of SignatureHandlerLibrary 1544 1545 #ifndef SHARING_FAST_NATIVE_FINGERPRINTS 1546 // Dummy definition (else normalization method is defined in CPU 1547 // dependent code) 1548 uint64_t InterpreterRuntime::normalize_fast_native_fingerprint(uint64_t fingerprint) { 1549 return fingerprint; 1550 } 1551 #endif 1552 1553 address SignatureHandlerLibrary::set_handler_blob() { 1554 BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size); 1555 if (handler_blob == nullptr) { 1556 return nullptr; 1557 } 1558 address handler = handler_blob->code_begin(); 1559 _handler_blob = handler_blob; 1560 _handler = handler; 1561 return handler; 1562 } 1563 1564 void SignatureHandlerLibrary::initialize() { 1565 if (_fingerprints != nullptr) { 1566 return; 1567 } 1568 if (set_handler_blob() == nullptr) { 1569 vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers"); 1570 } 1571 1572 BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer", 1573 SignatureHandlerLibrary::buffer_size); 1574 _buffer = bb->code_begin(); 1575 1576 _fingerprints = new (mtCode) GrowableArray<uint64_t>(32, mtCode); 1577 _handlers = new (mtCode) GrowableArray<address>(32, mtCode); 1578 } 1579 1580 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) { 1581 address handler = _handler; 1582 int insts_size = buffer->pure_insts_size(); 1583 if (handler + insts_size > _handler_blob->code_end()) { 1584 // get a new handler blob 1585 handler = set_handler_blob(); 1586 } 1587 if (handler != nullptr) { 1588 memcpy(handler, buffer->insts_begin(), insts_size); 1589 pd_set_handler(handler); 1590 ICache::invalidate_range(handler, insts_size); 1591 _handler = handler + insts_size; 1592 } 1593 return handler; 1594 } 1595 1596 void SignatureHandlerLibrary::add(const methodHandle& method) { 1597 if (method->signature_handler() == nullptr) { 1598 // use slow signature handler if we can't do better 1599 int handler_index = -1; 1600 // check if we can use customized (fast) signature handler 1601 if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::fp_max_size_of_parameters) { 1602 // use customized signature handler 1603 MutexLocker mu(SignatureHandlerLibrary_lock); 1604 // make sure data structure is initialized 1605 initialize(); 1606 // lookup method signature's fingerprint 1607 uint64_t fingerprint = Fingerprinter(method).fingerprint(); 1608 // allow CPU dependent code to optimize the fingerprints for the fast handler 1609 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint); 1610 handler_index = _fingerprints->find(fingerprint); 1611 // create handler if necessary 1612 if (handler_index < 0) { 1613 ResourceMark rm; 1614 ptrdiff_t align_offset = align_up(_buffer, CodeEntryAlignment) - (address)_buffer; 1615 CodeBuffer buffer((address)(_buffer + align_offset), 1616 checked_cast<int>(SignatureHandlerLibrary::buffer_size - align_offset)); 1617 InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint); 1618 // copy into code heap 1619 address handler = set_handler(&buffer); 1620 if (handler == nullptr) { 1621 // use slow signature handler (without memorizing it in the fingerprints) 1622 } else { 1623 // debugging support 1624 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) { 1625 ttyLocker ttyl; 1626 tty->cr(); 1627 tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)", 1628 _handlers->length(), 1629 (method->is_static() ? "static" : "receiver"), 1630 method->name_and_sig_as_C_string(), 1631 fingerprint, 1632 buffer.insts_size()); 1633 if (buffer.insts_size() > 0) { 1634 Disassembler::decode(handler, handler + buffer.insts_size(), tty 1635 NOT_PRODUCT(COMMA &buffer.asm_remarks())); 1636 } 1637 #ifndef PRODUCT 1638 address rh_begin = Interpreter::result_handler(method()->result_type()); 1639 if (CodeCache::contains(rh_begin)) { 1640 // else it might be special platform dependent values 1641 tty->print_cr(" --- associated result handler ---"); 1642 address rh_end = rh_begin; 1643 while (*(int*)rh_end != 0) { 1644 rh_end += sizeof(int); 1645 } 1646 Disassembler::decode(rh_begin, rh_end); 1647 } else { 1648 tty->print_cr(" associated result handler: " PTR_FORMAT, p2i(rh_begin)); 1649 } 1650 #endif 1651 } 1652 // add handler to library 1653 _fingerprints->append(fingerprint); 1654 _handlers->append(handler); 1655 // set handler index 1656 assert(_fingerprints->length() == _handlers->length(), "sanity check"); 1657 handler_index = _fingerprints->length() - 1; 1658 } 1659 } 1660 // Set handler under SignatureHandlerLibrary_lock 1661 if (handler_index < 0) { 1662 // use generic signature handler 1663 method->set_signature_handler(Interpreter::slow_signature_handler()); 1664 } else { 1665 // set handler 1666 method->set_signature_handler(_handlers->at(handler_index)); 1667 } 1668 } else { 1669 DEBUG_ONLY(JavaThread::current()->check_possible_safepoint()); 1670 // use generic signature handler 1671 method->set_signature_handler(Interpreter::slow_signature_handler()); 1672 } 1673 } 1674 #ifdef ASSERT 1675 int handler_index = -1; 1676 int fingerprint_index = -2; 1677 { 1678 // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized 1679 // in any way if accessed from multiple threads. To avoid races with another 1680 // thread which may change the arrays in the above, mutex protected block, we 1681 // have to protect this read access here with the same mutex as well! 1682 MutexLocker mu(SignatureHandlerLibrary_lock); 1683 if (_handlers != nullptr) { 1684 handler_index = _handlers->find(method->signature_handler()); 1685 uint64_t fingerprint = Fingerprinter(method).fingerprint(); 1686 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint); 1687 fingerprint_index = _fingerprints->find(fingerprint); 1688 } 1689 } 1690 assert(method->signature_handler() == Interpreter::slow_signature_handler() || 1691 handler_index == fingerprint_index, "sanity check"); 1692 #endif // ASSERT 1693 } 1694 1695 void SignatureHandlerLibrary::add(uint64_t fingerprint, address handler) { 1696 int handler_index = -1; 1697 // use customized signature handler 1698 MutexLocker mu(SignatureHandlerLibrary_lock); 1699 // make sure data structure is initialized 1700 initialize(); 1701 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint); 1702 handler_index = _fingerprints->find(fingerprint); 1703 // create handler if necessary 1704 if (handler_index < 0) { 1705 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) { 1706 tty->cr(); 1707 tty->print_cr("argument handler #%d at " PTR_FORMAT " for fingerprint " UINT64_FORMAT, 1708 _handlers->length(), 1709 p2i(handler), 1710 fingerprint); 1711 } 1712 _fingerprints->append(fingerprint); 1713 _handlers->append(handler); 1714 } else { 1715 if (PrintSignatureHandlers) { 1716 tty->cr(); 1717 tty->print_cr("duplicate argument handler #%d for fingerprint " UINT64_FORMAT "(old: " PTR_FORMAT ", new : " PTR_FORMAT ")", 1718 _handlers->length(), 1719 fingerprint, 1720 p2i(_handlers->at(handler_index)), 1721 p2i(handler)); 1722 } 1723 } 1724 } 1725 1726 1727 BufferBlob* SignatureHandlerLibrary::_handler_blob = nullptr; 1728 address SignatureHandlerLibrary::_handler = nullptr; 1729 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = nullptr; 1730 GrowableArray<address>* SignatureHandlerLibrary::_handlers = nullptr; 1731 address SignatureHandlerLibrary::_buffer = nullptr; 1732 1733 1734 JRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* current, Method* method)) 1735 methodHandle m(current, method); 1736 assert(m->is_native(), "sanity check"); 1737 // lookup native function entry point if it doesn't exist 1738 if (!m->has_native_function()) { 1739 NativeLookup::lookup(m, CHECK); 1740 } 1741 // make sure signature handler is installed 1742 SignatureHandlerLibrary::add(m); 1743 // The interpreter entry point checks the signature handler first, 1744 // before trying to fetch the native entry point and klass mirror. 1745 // We must set the signature handler last, so that multiple processors 1746 // preparing the same method will be sure to see non-null entry & mirror. 1747 JRT_END 1748 1749 #if defined(IA32) || defined(AMD64) || defined(ARM) 1750 JRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* current, void* src_address, void* dest_address)) 1751 assert(current == JavaThread::current(), "pre-condition"); 1752 if (src_address == dest_address) { 1753 return; 1754 } 1755 ResourceMark rm; 1756 LastFrameAccessor last_frame(current); 1757 assert(last_frame.is_interpreted_frame(), ""); 1758 jint bci = last_frame.bci(); 1759 methodHandle mh(current, last_frame.method()); 1760 Bytecode_invoke invoke(mh, bci); 1761 ArgumentSizeComputer asc(invoke.signature()); 1762 int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver 1763 Copy::conjoint_jbytes(src_address, dest_address, 1764 size_of_arguments * Interpreter::stackElementSize); 1765 JRT_END 1766 #endif 1767 1768 #if INCLUDE_JVMTI 1769 // This is a support of the JVMTI PopFrame interface. 1770 // Make sure it is an invokestatic of a polymorphic intrinsic that has a member_name argument 1771 // and return it as a vm_result so that it can be reloaded in the list of invokestatic parameters. 1772 // The member_name argument is a saved reference (in local#0) to the member_name. 1773 // For backward compatibility with some JDK versions (7, 8) it can also be a direct method handle. 1774 // FIXME: remove DMH case after j.l.i.InvokerBytecodeGenerator code shape is updated. 1775 JRT_ENTRY(void, InterpreterRuntime::member_name_arg_or_null(JavaThread* current, address member_name, 1776 Method* method, address bcp)) 1777 Bytecodes::Code code = Bytecodes::code_at(method, bcp); 1778 if (code != Bytecodes::_invokestatic) { 1779 return; 1780 } 1781 ConstantPool* cpool = method->constants(); 1782 int cp_index = Bytes::get_native_u2(bcp + 1) + ConstantPool::CPCACHE_INDEX_TAG; 1783 Symbol* cname = cpool->klass_name_at(cpool->klass_ref_index_at(cp_index, code)); 1784 Symbol* mname = cpool->name_ref_at(cp_index, code); 1785 1786 if (MethodHandles::has_member_arg(cname, mname)) { 1787 oop member_name_oop = cast_to_oop(member_name); 1788 if (java_lang_invoke_DirectMethodHandle::is_instance(member_name_oop)) { 1789 // FIXME: remove after j.l.i.InvokerBytecodeGenerator code shape is updated. 1790 member_name_oop = java_lang_invoke_DirectMethodHandle::member(member_name_oop); 1791 } 1792 current->set_vm_result(member_name_oop); 1793 } else { 1794 current->set_vm_result(nullptr); 1795 } 1796 JRT_END 1797 #endif // INCLUDE_JVMTI 1798 1799 #ifndef PRODUCT 1800 // This must be a JRT_LEAF function because the interpreter must save registers on x86 to 1801 // call this, which changes rsp and makes the interpreter's expression stack not walkable. 1802 // The generated code still uses call_VM because that will set up the frame pointer for 1803 // bcp and method. 1804 JRT_LEAF(intptr_t, InterpreterRuntime::trace_bytecode(JavaThread* current, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2)) 1805 assert(current == JavaThread::current(), "pre-condition"); 1806 LastFrameAccessor last_frame(current); 1807 assert(last_frame.is_interpreted_frame(), "must be an interpreted frame"); 1808 methodHandle mh(current, last_frame.method()); 1809 BytecodeTracer::trace_interpreter(mh, last_frame.bcp(), tos, tos2); 1810 return preserve_this_value; 1811 JRT_END 1812 #endif // !PRODUCT