1 /*
   2  * Copyright (c) 1997, 2025, 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 "classfile/javaClasses.inline.hpp"
  26 #include "classfile/symbolTable.hpp"
  27 #include "classfile/vmClasses.hpp"
  28 #include "classfile/vmSymbols.hpp"
  29 #include "code/codeCache.hpp"
  30 #include "compiler/compilationPolicy.hpp"
  31 #include "compiler/compileBroker.hpp"
  32 #include "compiler/disassembler.hpp"
  33 #include "gc/shared/barrierSetNMethod.hpp"
  34 #include "gc/shared/collectedHeap.hpp"
  35 #include "interpreter/bytecodeTracer.hpp"
  36 #include "interpreter/interpreter.hpp"
  37 #include "interpreter/interpreterRuntime.hpp"
  38 #include "interpreter/linkResolver.hpp"
  39 #include "interpreter/templateTable.hpp"
  40 #include "jvm_io.h"
  41 #include "logging/log.hpp"
  42 #include "memory/oopFactory.hpp"
  43 #include "memory/resourceArea.hpp"
  44 #include "memory/universe.hpp"
  45 #include "oops/constantPool.inline.hpp"
  46 #include "oops/cpCache.inline.hpp"
  47 #include "oops/instanceKlass.inline.hpp"
  48 #include "oops/klass.inline.hpp"
  49 #include "oops/methodData.hpp"
  50 #include "oops/method.inline.hpp"
  51 #include "oops/objArrayKlass.hpp"
  52 #include "oops/objArrayOop.inline.hpp"
  53 #include "oops/oop.inline.hpp"
  54 #include "oops/symbol.hpp"
  55 #include "prims/jvmtiExport.hpp"
  56 #include "prims/methodHandles.hpp"
  57 #include "prims/nativeLookup.hpp"
  58 #include "runtime/atomic.hpp"
  59 #include "runtime/continuation.hpp"
  60 #include "runtime/deoptimization.hpp"
  61 #include "runtime/fieldDescriptor.inline.hpp"
  62 #include "runtime/frame.inline.hpp"
  63 #include "runtime/handles.inline.hpp"
  64 #include "runtime/icache.hpp"
  65 #include "runtime/interfaceSupport.inline.hpp"
  66 #include "runtime/java.hpp"
  67 #include "runtime/javaCalls.hpp"
  68 #include "runtime/jfieldIDWorkaround.hpp"
  69 #include "runtime/osThread.hpp"
  70 #include "runtime/sharedRuntime.hpp"
  71 #include "runtime/stackWatermarkSet.hpp"
  72 #include "runtime/stubRoutines.hpp"
  73 #include "runtime/synchronizer.inline.hpp"
  74 #include "utilities/align.hpp"
  75 #include "utilities/checkedCast.hpp"
  76 #include "utilities/copy.hpp"
  77 #include "utilities/events.hpp"
  78 #if INCLUDE_JFR
  79 #include "jfr/jfr.inline.hpp"
  80 #endif
  81 
  82 // Helper class to access current interpreter state
  83 class LastFrameAccessor : public StackObj {
  84   frame _last_frame;
  85 public:
  86   LastFrameAccessor(JavaThread* current) {
  87     assert(current == Thread::current(), "sanity");
  88     _last_frame = current->last_frame();
  89   }
  90   bool is_interpreted_frame() const              { return _last_frame.is_interpreted_frame(); }
  91   Method*   method() const                       { return _last_frame.interpreter_frame_method(); }
  92   address   bcp() const                          { return _last_frame.interpreter_frame_bcp(); }
  93   int       bci() const                          { return _last_frame.interpreter_frame_bci(); }
  94   address   mdp() const                          { return _last_frame.interpreter_frame_mdp(); }
  95 
  96   void      set_bcp(address bcp)                 { _last_frame.interpreter_frame_set_bcp(bcp); }
  97   void      set_mdp(address dp)                  { _last_frame.interpreter_frame_set_mdp(dp); }
  98 
  99   // pass method to avoid calling unsafe bcp_to_method (partial fix 4926272)
 100   Bytecodes::Code code() const                   { return Bytecodes::code_at(method(), bcp()); }
 101 
 102   Bytecode  bytecode() const                     { return Bytecode(method(), bcp()); }
 103   int get_index_u1(Bytecodes::Code bc) const     { return bytecode().get_index_u1(bc); }
 104   int get_index_u2(Bytecodes::Code bc) const     { return bytecode().get_index_u2(bc); }
 105   int get_index_u4(Bytecodes::Code bc) const     { return bytecode().get_index_u4(bc); }
 106   int number_of_dimensions() const               { return bcp()[3]; }
 107 
 108   oop callee_receiver(Symbol* signature) {
 109     return _last_frame.interpreter_callee_receiver(signature);
 110   }
 111   BasicObjectLock* monitor_begin() const {
 112     return _last_frame.interpreter_frame_monitor_begin();
 113   }
 114   BasicObjectLock* monitor_end() const {
 115     return _last_frame.interpreter_frame_monitor_end();
 116   }
 117   BasicObjectLock* next_monitor(BasicObjectLock* current) const {
 118     return _last_frame.next_monitor_in_interpreter_frame(current);
 119   }
 120 
 121   frame& get_frame()                             { return _last_frame; }
 122 };
 123 
 124 //------------------------------------------------------------------------------------------------------------------------
 125 // State accessors
 126 
 127 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread* current) {
 128   LastFrameAccessor last_frame(current);
 129   last_frame.set_bcp(bcp);
 130   if (ProfileInterpreter) {
 131     // ProfileTraps uses MDOs independently of ProfileInterpreter.
 132     // That is why we must check both ProfileInterpreter and mdo != nullptr.
 133     MethodData* mdo = last_frame.method()->method_data();
 134     if (mdo != nullptr) {
 135       NEEDS_CLEANUP;
 136       last_frame.set_mdp(mdo->bci_to_dp(last_frame.bci()));
 137     }
 138   }
 139 }
 140 
 141 //------------------------------------------------------------------------------------------------------------------------
 142 // Constants
 143 
 144 
 145 JRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* current, bool wide))
 146   // access constant pool
 147   LastFrameAccessor last_frame(current);
 148   ConstantPool* pool = last_frame.method()->constants();
 149   int cp_index = wide ? last_frame.get_index_u2(Bytecodes::_ldc_w) : last_frame.get_index_u1(Bytecodes::_ldc);
 150   constantTag tag = pool->tag_at(cp_index);
 151 
 152   assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call");
 153   Klass* klass = pool->klass_at(cp_index, CHECK);
 154   oop java_class = klass->java_mirror();
 155   current->set_vm_result_oop(java_class);
 156 JRT_END
 157 
 158 JRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* current, Bytecodes::Code bytecode)) {
 159   assert(bytecode == Bytecodes::_ldc ||
 160          bytecode == Bytecodes::_ldc_w ||
 161          bytecode == Bytecodes::_ldc2_w ||
 162          bytecode == Bytecodes::_fast_aldc ||
 163          bytecode == Bytecodes::_fast_aldc_w, "wrong bc");
 164   ResourceMark rm(current);
 165   const bool is_fast_aldc = (bytecode == Bytecodes::_fast_aldc ||
 166                              bytecode == Bytecodes::_fast_aldc_w);
 167   LastFrameAccessor last_frame(current);
 168   methodHandle m (current, last_frame.method());
 169   Bytecode_loadconstant ldc(m, last_frame.bci());
 170 
 171   // Double-check the size.  (Condy can have any type.)
 172   BasicType type = ldc.result_type();
 173   switch (type2size[type]) {
 174   case 2: guarantee(bytecode == Bytecodes::_ldc2_w, ""); break;
 175   case 1: guarantee(bytecode != Bytecodes::_ldc2_w, ""); break;
 176   default: ShouldNotReachHere();
 177   }
 178 
 179   // Resolve the constant.  This does not do unboxing.
 180   // But it does replace Universe::the_null_sentinel by null.
 181   oop result = ldc.resolve_constant(CHECK);
 182   assert(result != nullptr || is_fast_aldc, "null result only valid for fast_aldc");
 183 
 184 #ifdef ASSERT
 185   {
 186     // The bytecode wrappers aren't GC-safe so construct a new one
 187     Bytecode_loadconstant ldc2(m, last_frame.bci());
 188     int rindex = ldc2.cache_index();
 189     if (rindex < 0)
 190       rindex = m->constants()->cp_to_object_index(ldc2.pool_index());
 191     if (rindex >= 0) {
 192       oop coop = m->constants()->resolved_reference_at(rindex);
 193       oop roop = (result == nullptr ? Universe::the_null_sentinel() : result);
 194       assert(roop == coop, "expected result for assembly code");
 195     }
 196   }
 197 #endif
 198   current->set_vm_result_oop(result);
 199   if (!is_fast_aldc) {
 200     // Tell the interpreter how to unbox the primitive.
 201     guarantee(java_lang_boxing_object::is_instance(result, type), "");
 202     int offset = java_lang_boxing_object::value_offset(type);
 203     intptr_t flags = ((as_TosState(type) << ConstantPoolCache::tos_state_shift)
 204                       | (offset & ConstantPoolCache::field_index_mask));
 205     current->set_vm_result_metadata((Metadata*)flags);
 206   }
 207 }
 208 JRT_END
 209 
 210 
 211 //------------------------------------------------------------------------------------------------------------------------
 212 // Allocation
 213 
 214 JRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* current, ConstantPool* pool, int index))
 215   Klass* k = pool->klass_at(index, CHECK);
 216   InstanceKlass* klass = InstanceKlass::cast(k);
 217 
 218   // Make sure we are not instantiating an abstract klass
 219   klass->check_valid_for_instantiation(true, CHECK);
 220 
 221   // Make sure klass is initialized
 222   klass->initialize(CHECK);
 223 
 224   oop obj = klass->allocate_instance(CHECK);
 225   current->set_vm_result_oop(obj);
 226 JRT_END
 227 
 228 
 229 JRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* current, BasicType type, jint size))
 230   oop obj = oopFactory::new_typeArray(type, size, CHECK);
 231   current->set_vm_result_oop(obj);
 232 JRT_END
 233 
 234 
 235 JRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* current, ConstantPool* pool, int index, jint size))
 236   Klass*    klass = pool->klass_at(index, CHECK);
 237   objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
 238   current->set_vm_result_oop(obj);
 239 JRT_END
 240 
 241 
 242 JRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* current, jint* first_size_address))
 243   // We may want to pass in more arguments - could make this slightly faster
 244   LastFrameAccessor last_frame(current);
 245   ConstantPool* constants = last_frame.method()->constants();
 246   int          i = last_frame.get_index_u2(Bytecodes::_multianewarray);
 247   Klass* klass   = constants->klass_at(i, CHECK);
 248   int   nof_dims = last_frame.number_of_dimensions();
 249   assert(klass->is_klass(), "not a class");
 250   assert(nof_dims >= 1, "multianewarray rank must be nonzero");
 251 
 252   // We must create an array of jints to pass to multi_allocate.
 253   ResourceMark rm(current);
 254   const int small_dims = 10;
 255   jint dim_array[small_dims];
 256   jint *dims = &dim_array[0];
 257   if (nof_dims > small_dims) {
 258     dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
 259   }
 260   for (int index = 0; index < nof_dims; index++) {
 261     // offset from first_size_address is addressed as local[index]
 262     int n = Interpreter::local_offset_in_bytes(index)/jintSize;
 263     dims[index] = first_size_address[n];
 264   }
 265   oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
 266   current->set_vm_result_oop(obj);
 267 JRT_END
 268 
 269 
 270 JRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* current, oopDesc* obj))
 271   assert(oopDesc::is_oop(obj), "must be a valid oop");
 272   assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
 273   InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
 274 JRT_END
 275 
 276 
 277 // Quicken instance-of and check-cast bytecodes
 278 JRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* current))
 279   // Force resolving; quicken the bytecode
 280   LastFrameAccessor last_frame(current);
 281   int which = last_frame.get_index_u2(Bytecodes::_checkcast);
 282   ConstantPool* cpool = last_frame.method()->constants();
 283   // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
 284   // program we might have seen an unquick'd bytecode in the interpreter but have another
 285   // thread quicken the bytecode before we get here.
 286   // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
 287   Klass* klass = cpool->klass_at(which, CHECK);
 288   current->set_vm_result_metadata(klass);
 289 JRT_END
 290 
 291 
 292 //------------------------------------------------------------------------------------------------------------------------
 293 // Exceptions
 294 
 295 void InterpreterRuntime::note_trap_inner(JavaThread* current, int reason,
 296                                          const methodHandle& trap_method, int trap_bci) {
 297   if (trap_method.not_null()) {
 298     MethodData* trap_mdo = trap_method->method_data();
 299     if (trap_mdo == nullptr) {
 300       ExceptionMark em(current);
 301       JavaThread* THREAD = current; // For exception macros.
 302       Method::build_profiling_method_data(trap_method, THREAD);
 303       if (HAS_PENDING_EXCEPTION) {
 304         // Only metaspace OOM is expected. No Java code executed.
 305         assert((PENDING_EXCEPTION->is_a(vmClasses::OutOfMemoryError_klass())),
 306                "we expect only an OOM error here");
 307         CLEAR_PENDING_EXCEPTION;
 308       }
 309       trap_mdo = trap_method->method_data();
 310       // and fall through...
 311     }
 312     if (trap_mdo != nullptr) {
 313       // Update per-method count of trap events.  The interpreter
 314       // is updating the MDO to simulate the effect of compiler traps.
 315       Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
 316     }
 317   }
 318 }
 319 
 320 // Assume the compiler is (or will be) interested in this event.
 321 // If necessary, create an MDO to hold the information, and record it.
 322 void InterpreterRuntime::note_trap(JavaThread* current, int reason) {
 323   assert(ProfileTraps, "call me only if profiling");
 324   LastFrameAccessor last_frame(current);
 325   methodHandle trap_method(current, last_frame.method());
 326   int trap_bci = trap_method->bci_from(last_frame.bcp());
 327   note_trap_inner(current, reason, trap_method, trap_bci);
 328 }
 329 
 330 static Handle get_preinitialized_exception(Klass* k, TRAPS) {
 331   // get klass
 332   InstanceKlass* klass = InstanceKlass::cast(k);
 333   assert(klass->is_initialized(),
 334          "this klass should have been initialized during VM initialization");
 335   // create instance - do not call constructor since we may have no
 336   // (java) stack space left (should assert constructor is empty)
 337   Handle exception;
 338   oop exception_oop = klass->allocate_instance(CHECK_(exception));
 339   exception = Handle(THREAD, exception_oop);
 340   if (StackTraceInThrowable) {
 341     java_lang_Throwable::fill_in_stack_trace(exception);
 342   }
 343   return exception;
 344 }
 345 
 346 // Special handling for stack overflow: since we don't have any (java) stack
 347 // space left we use the pre-allocated & pre-initialized StackOverflowError
 348 // klass to create an stack overflow error instance.  We do not call its
 349 // constructor for the same reason (it is empty, anyway).
 350 JRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* current))
 351   Handle exception = get_preinitialized_exception(
 352                                  vmClasses::StackOverflowError_klass(),
 353                                  CHECK);
 354   // Increment counter for hs_err file reporting
 355   Atomic::inc(&Exceptions::_stack_overflow_errors);
 356   // Remove the ScopedValue bindings in case we got a StackOverflowError
 357   // while we were trying to manipulate ScopedValue bindings.
 358   current->clear_scopedValueBindings();
 359   THROW_HANDLE(exception);
 360 JRT_END
 361 
 362 JRT_ENTRY(void, InterpreterRuntime::throw_delayed_StackOverflowError(JavaThread* current))
 363   Handle exception = get_preinitialized_exception(
 364                                  vmClasses::StackOverflowError_klass(),
 365                                  CHECK);
 366   java_lang_Throwable::set_message(exception(),
 367           Universe::delayed_stack_overflow_error_message());
 368   // Increment counter for hs_err file reporting
 369   Atomic::inc(&Exceptions::_stack_overflow_errors);
 370   // Remove the ScopedValue bindings in case we got a StackOverflowError
 371   // while we were trying to manipulate ScopedValue bindings.
 372   current->clear_scopedValueBindings();
 373   THROW_HANDLE(exception);
 374 JRT_END
 375 
 376 JRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* current, char* name, char* message))
 377   // lookup exception klass
 378   TempNewSymbol s = SymbolTable::new_symbol(name);
 379   if (ProfileTraps) {
 380     if (s == vmSymbols::java_lang_ArithmeticException()) {
 381       note_trap(current, Deoptimization::Reason_div0_check);
 382     } else if (s == vmSymbols::java_lang_NullPointerException()) {
 383       note_trap(current, Deoptimization::Reason_null_check);
 384     }
 385   }
 386   // create exception
 387   Handle exception = Exceptions::new_exception(current, s, message);
 388   current->set_vm_result_oop(exception());
 389 JRT_END
 390 
 391 
 392 JRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* current, char* name, oopDesc* obj))
 393   // Produce the error message first because note_trap can safepoint
 394   ResourceMark rm(current);
 395   const char* klass_name = obj->klass()->external_name();
 396   // lookup exception klass
 397   TempNewSymbol s = SymbolTable::new_symbol(name);
 398   if (ProfileTraps) {
 399     if (s == vmSymbols::java_lang_ArrayStoreException()) {
 400       note_trap(current, Deoptimization::Reason_array_check);
 401     } else {
 402       note_trap(current, Deoptimization::Reason_class_check);
 403     }
 404   }
 405   // create exception, with klass name as detail message
 406   Handle exception = Exceptions::new_exception(current, s, klass_name);
 407   current->set_vm_result_oop(exception());
 408 JRT_END
 409 
 410 JRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* current, arrayOopDesc* a, jint index))
 411   // Produce the error message first because note_trap can safepoint
 412   ResourceMark rm(current);
 413   stringStream ss;
 414   ss.print("Index %d out of bounds for length %d", index, a->length());
 415 
 416   if (ProfileTraps) {
 417     note_trap(current, Deoptimization::Reason_range_check);
 418   }
 419 
 420   THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), ss.as_string());
 421 JRT_END
 422 
 423 JRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
 424   JavaThread* current, oopDesc* obj))
 425 
 426   // Produce the error message first because note_trap can safepoint
 427   ResourceMark rm(current);
 428   char* message = SharedRuntime::generate_class_cast_message(
 429     current, obj->klass());
 430 
 431   if (ProfileTraps) {
 432     note_trap(current, Deoptimization::Reason_class_check);
 433   }
 434 
 435   // create exception
 436   THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
 437 JRT_END
 438 
 439 // exception_handler_for_exception(...) returns the continuation address,
 440 // the exception oop (via TLS) and sets the bci/bcp for the continuation.
 441 // The exception oop is returned to make sure it is preserved over GC (it
 442 // is only on the stack if the exception was thrown explicitly via athrow).
 443 // During this operation, the expression stack contains the values for the
 444 // bci where the exception happened. If the exception was propagated back
 445 // from a call, the expression stack contains the values for the bci at the
 446 // invoke w/o arguments (i.e., as if one were inside the call).
 447 // Note that the implementation of this method assumes it's only called when an exception has actually occured
 448 JRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* current, oopDesc* exception))
 449   // We get here after we have unwound from a callee throwing an exception
 450   // into the interpreter. Any deferred stack processing is notified of
 451   // the event via the StackWatermarkSet.
 452   StackWatermarkSet::after_unwind(current);
 453 
 454   LastFrameAccessor last_frame(current);
 455   Handle             h_exception(current, exception);
 456   methodHandle       h_method   (current, last_frame.method());
 457   constantPoolHandle h_constants(current, h_method->constants());
 458   bool               should_repeat;
 459   int                handler_bci;
 460   int                current_bci = last_frame.bci();
 461 
 462   if (current->frames_to_pop_failed_realloc() > 0) {
 463     // Allocation of scalar replaced object used in this frame
 464     // failed. Unconditionally pop the frame.
 465     current->dec_frames_to_pop_failed_realloc();
 466     current->set_vm_result_oop(h_exception());
 467     // If the method is synchronized we already unlocked the monitor
 468     // during deoptimization so the interpreter needs to skip it when
 469     // the frame is popped.
 470     current->set_do_not_unlock_if_synchronized(true);
 471     return Interpreter::remove_activation_entry();
 472   }
 473 
 474   // Need to do this check first since when _do_not_unlock_if_synchronized
 475   // is set, we don't want to trigger any classloading which may make calls
 476   // into java, or surprisingly find a matching exception handler for bci 0
 477   // since at this moment the method hasn't been "officially" entered yet.
 478   if (current->do_not_unlock_if_synchronized()) {
 479     ResourceMark rm;
 480     assert(current_bci == 0,  "bci isn't zero for do_not_unlock_if_synchronized");
 481     current->set_vm_result_oop(exception);
 482     return Interpreter::remove_activation_entry();
 483   }
 484 
 485   do {
 486     should_repeat = false;
 487 
 488     // assertions
 489     assert(h_exception.not_null(), "null exceptions should be handled by athrow");
 490     // Check that exception is a subclass of Throwable.
 491     assert(h_exception->is_a(vmClasses::Throwable_klass()),
 492            "Exception not subclass of Throwable");
 493 
 494     // tracing
 495     if (log_is_enabled(Info, exceptions)) {
 496       ResourceMark rm(current);
 497       stringStream tempst;
 498       tempst.print("interpreter method <%s>\n"
 499                    " at bci %d for thread " INTPTR_FORMAT " (%s)",
 500                    h_method->print_value_string(), current_bci, p2i(current), current->name());
 501       Exceptions::log_exception(h_exception, tempst.as_string());
 502     }
 503     if (log_is_enabled(Info, exceptions, stacktrace)) {
 504       Exceptions::log_exception_stacktrace(h_exception, h_method, current_bci);
 505     }
 506 
 507 // Don't go paging in something which won't be used.
 508 //     else if (extable->length() == 0) {
 509 //       // disabled for now - interpreter is not using shortcut yet
 510 //       // (shortcut is not to call runtime if we have no exception handlers)
 511 //       // warning("performance bug: should not call runtime if method has no exception handlers");
 512 //     }
 513     // for AbortVMOnException flag
 514     Exceptions::debug_check_abort(h_exception);
 515 
 516     // exception handler lookup
 517     Klass* klass = h_exception->klass();
 518     handler_bci = Method::fast_exception_handler_bci_for(h_method, klass, current_bci, THREAD);
 519     if (HAS_PENDING_EXCEPTION) {
 520       // We threw an exception while trying to find the exception handler.
 521       // Transfer the new exception to the exception handle which will
 522       // be set into thread local storage, and do another lookup for an
 523       // exception handler for this exception, this time starting at the
 524       // BCI of the exception handler which caused the exception to be
 525       // thrown (bug 4307310).
 526       h_exception = Handle(THREAD, PENDING_EXCEPTION);
 527       CLEAR_PENDING_EXCEPTION;
 528       if (handler_bci >= 0) {
 529         current_bci = handler_bci;
 530         should_repeat = true;
 531       }
 532     }
 533   } while (should_repeat == true);
 534 
 535 #if INCLUDE_JVMCI
 536   if (EnableJVMCI && h_method->method_data() != nullptr) {
 537     ResourceMark rm(current);
 538     MethodData* mdo = h_method->method_data();
 539 
 540     // Lock to read ProfileData, and ensure lock is not broken by a safepoint
 541     MutexLocker ml(mdo->extra_data_lock(), Mutex::_no_safepoint_check_flag);
 542 
 543     ProfileData* pdata = mdo->allocate_bci_to_data(current_bci, nullptr);
 544     if (pdata != nullptr && pdata->is_BitData()) {
 545       BitData* bit_data = (BitData*) pdata;
 546       bit_data->set_exception_seen();
 547     }
 548   }
 549 #endif
 550 
 551   // notify JVMTI of an exception throw; JVMTI will detect if this is a first
 552   // time throw or a stack unwinding throw and accordingly notify the debugger
 553   if (JvmtiExport::can_post_on_exceptions()) {
 554     JvmtiExport::post_exception_throw(current, h_method(), last_frame.bcp(), h_exception());
 555   }
 556 
 557   address continuation = nullptr;
 558   address handler_pc = nullptr;
 559   if (handler_bci < 0 || !current->stack_overflow_state()->reguard_stack((address) &continuation)) {
 560     // Forward exception to callee (leaving bci/bcp untouched) because (a) no
 561     // handler in this method, or (b) after a stack overflow there is not yet
 562     // enough stack space available to reprotect the stack.
 563     continuation = Interpreter::remove_activation_entry();
 564 #if COMPILER2_OR_JVMCI
 565     // Count this for compilation purposes
 566     h_method->interpreter_throwout_increment(THREAD);
 567 #endif
 568   } else {
 569     // handler in this method => change bci/bcp to handler bci/bcp and continue there
 570     handler_pc = h_method->code_base() + handler_bci;
 571     h_method->set_exception_handler_entered(handler_bci); // profiling
 572 #ifndef ZERO
 573     set_bcp_and_mdp(handler_pc, current);
 574     continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
 575 #else
 576     continuation = (address)(intptr_t) handler_bci;
 577 #endif
 578   }
 579 
 580   // notify debugger of an exception catch
 581   // (this is good for exceptions caught in native methods as well)
 582   if (JvmtiExport::can_post_on_exceptions()) {
 583     JvmtiExport::notice_unwind_due_to_exception(current, h_method(), handler_pc, h_exception(), (handler_pc != nullptr));
 584   }
 585 
 586   current->set_vm_result_oop(h_exception());
 587   return continuation;
 588 JRT_END
 589 
 590 
 591 JRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* current))
 592   assert(current->has_pending_exception(), "must only be called if there's an exception pending");
 593   // nothing to do - eventually we should remove this code entirely (see comments @ call sites)
 594 JRT_END
 595 
 596 
 597 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* current))
 598   THROW(vmSymbols::java_lang_AbstractMethodError());
 599 JRT_END
 600 
 601 // This method is called from the "abstract_entry" of the interpreter.
 602 // At that point, the arguments have already been removed from the stack
 603 // and therefore we don't have the receiver object at our fingertips. (Though,
 604 // on some platforms the receiver still resides in a register...). Thus,
 605 // we have no choice but print an error message not containing the receiver
 606 // type.
 607 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorWithMethod(JavaThread* current,
 608                                                                         Method* missingMethod))
 609   ResourceMark rm(current);
 610   assert(missingMethod != nullptr, "sanity");
 611   methodHandle m(current, missingMethod);
 612   LinkResolver::throw_abstract_method_error(m, THREAD);
 613 JRT_END
 614 
 615 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorVerbose(JavaThread* current,
 616                                                                      Klass* recvKlass,
 617                                                                      Method* missingMethod))
 618   ResourceMark rm(current);
 619   methodHandle mh = methodHandle(current, missingMethod);
 620   LinkResolver::throw_abstract_method_error(mh, recvKlass, THREAD);
 621 JRT_END
 622 
 623 
 624 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* current))
 625   THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
 626 JRT_END
 627 
 628 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeErrorVerbose(JavaThread* current,
 629                                                                               Klass* recvKlass,
 630                                                                               Klass* interfaceKlass))
 631   ResourceMark rm(current);
 632   char buf[1000];
 633   buf[0] = '\0';
 634   jio_snprintf(buf, sizeof(buf),
 635                "Class %s does not implement the requested interface %s",
 636                recvKlass ? recvKlass->external_name() : "nullptr",
 637                interfaceKlass ? interfaceKlass->external_name() : "nullptr");
 638   THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
 639 JRT_END
 640 
 641 JRT_ENTRY(void, InterpreterRuntime::throw_NullPointerException(JavaThread* current))
 642   THROW(vmSymbols::java_lang_NullPointerException());
 643 JRT_END
 644 
 645 //------------------------------------------------------------------------------------------------------------------------
 646 // Fields
 647 //
 648 
 649 void InterpreterRuntime::resolve_get_put(JavaThread* current, Bytecodes::Code bytecode) {
 650   LastFrameAccessor last_frame(current);
 651   constantPoolHandle pool(current, last_frame.method()->constants());
 652   methodHandle m(current, last_frame.method());
 653 
 654   resolve_get_put(bytecode, last_frame.get_index_u2(bytecode), m, pool, true /*initialize_holder*/, current);
 655 }
 656 
 657 void InterpreterRuntime::resolve_get_put(Bytecodes::Code bytecode, int field_index,
 658                                          methodHandle& m,
 659                                          constantPoolHandle& pool,
 660                                          bool initialize_holder, TRAPS) {
 661   fieldDescriptor info;
 662   bool is_put    = (bytecode == Bytecodes::_putfield  || bytecode == Bytecodes::_nofast_putfield ||
 663                     bytecode == Bytecodes::_putstatic);
 664   bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
 665 
 666   {
 667     JvmtiHideSingleStepping jhss(THREAD);
 668     LinkResolver::resolve_field_access(info, pool, field_index,
 669                                        m, bytecode, initialize_holder, 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   // compute auxiliary field attributes
 676   TosState state  = as_TosState(info.field_type());
 677 
 678   // Resolution of put instructions on final fields is delayed. That is required so that
 679   // exceptions are thrown at the correct place (when the instruction is actually invoked).
 680   // If we do not resolve an instruction in the current pass, leaving the put_code
 681   // set to zero will cause the next put instruction to the same field to reresolve.
 682 
 683   // Resolution of put instructions to final instance fields with invalid updates (i.e.,
 684   // to final instance fields with updates originating from a method different than <init>)
 685   // is inhibited. A putfield instruction targeting an instance final field must throw
 686   // an IllegalAccessError if the instruction is not in an instance
 687   // initializer method <init>. If resolution were not inhibited, a putfield
 688   // in an initializer method could be resolved in the initializer. Subsequent
 689   // putfield instructions to the same field would then use cached information.
 690   // As a result, those instructions would not pass through the VM. That is,
 691   // checks in resolve_field_access() would not be executed for those instructions
 692   // and the required IllegalAccessError would not be thrown.
 693   //
 694   // Also, we need to delay resolving getstatic and putstatic instructions until the
 695   // class is initialized.  This is required so that access to the static
 696   // field will call the initialization function every time until the class
 697   // is completely initialized ala. in 2.17.5 in JVM Specification.
 698   InstanceKlass* klass = info.field_holder();
 699   bool uninitialized_static = is_static && !klass->is_initialized();
 700   bool has_initialized_final_update = info.field_holder()->major_version() >= 53 &&
 701                                       info.has_initialized_final_update();
 702   assert(!(has_initialized_final_update && !info.access_flags().is_final()), "Fields with initialized final updates must be final");
 703 
 704   Bytecodes::Code get_code = (Bytecodes::Code)0;
 705   Bytecodes::Code put_code = (Bytecodes::Code)0;
 706   if (!uninitialized_static) {
 707     get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield);
 708     if ((is_put && !has_initialized_final_update) || !info.access_flags().is_final()) {
 709       put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
 710     }
 711   }
 712 
 713   ResolvedFieldEntry* entry = pool->resolved_field_entry_at(field_index);
 714   entry->set_flags(info.access_flags().is_final(), info.access_flags().is_volatile());
 715   entry->fill_in(info.field_holder(), info.offset(),
 716                  checked_cast<u2>(info.index()), checked_cast<u1>(state),
 717                  static_cast<u1>(get_code), static_cast<u1>(put_code));
 718 }
 719 
 720 
 721 //------------------------------------------------------------------------------------------------------------------------
 722 // Synchronization
 723 //
 724 // The interpreter's synchronization code is factored out so that it can
 725 // be shared by method invocation and synchronized blocks.
 726 //%note synchronization_3
 727 
 728 //%note monitor_1
 729 JRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* current, BasicObjectLock* elem))
 730 #ifdef ASSERT
 731   current->last_frame().interpreter_frame_verify_monitor(elem);
 732 #endif
 733   Handle h_obj(current, elem->obj());
 734   assert(Universe::heap()->is_in_or_null(h_obj()),
 735          "must be null or an object");
 736   ObjectSynchronizer::enter(h_obj, elem->lock(), current);
 737   assert(Universe::heap()->is_in_or_null(elem->obj()),
 738          "must be null or an object");
 739 #ifdef ASSERT
 740   if (!current->preempting()) current->last_frame().interpreter_frame_verify_monitor(elem);
 741 #endif
 742 JRT_END
 743 
 744 JRT_LEAF(void, InterpreterRuntime::monitorexit(BasicObjectLock* elem))
 745   oop obj = elem->obj();
 746   assert(Universe::heap()->is_in(obj), "must be an object");
 747   // The object could become unlocked through a JNI call, which we have no other checks for.
 748   // Give a fatal message if CheckJNICalls. Otherwise we ignore it.
 749   if (obj->is_unlocked()) {
 750     if (CheckJNICalls) {
 751       fatal("Object has been unlocked by JNI");
 752     }
 753     return;
 754   }
 755   ObjectSynchronizer::exit(obj, elem->lock(), JavaThread::current());
 756   // Free entry. If it is not cleared, the exception handling code will try to unlock the monitor
 757   // again at method exit or in the case of an exception.
 758   elem->set_obj(nullptr);
 759 JRT_END
 760 
 761 
 762 JRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* current))
 763   THROW(vmSymbols::java_lang_IllegalMonitorStateException());
 764 JRT_END
 765 
 766 
 767 JRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* current))
 768   // Returns an illegal exception to install into the current thread. The
 769   // pending_exception flag is cleared so normal exception handling does not
 770   // trigger. Any current installed exception will be overwritten. This
 771   // method will be called during an exception unwind.
 772 
 773   assert(!HAS_PENDING_EXCEPTION, "no pending exception");
 774   Handle exception(current, current->vm_result_oop());
 775   assert(exception() != nullptr, "vm result should be set");
 776   current->set_vm_result_oop(nullptr); // clear vm result before continuing (may cause memory leaks and assert failures)
 777   exception = get_preinitialized_exception(vmClasses::IllegalMonitorStateException_klass(), CATCH);
 778   current->set_vm_result_oop(exception());
 779 JRT_END
 780 
 781 
 782 //------------------------------------------------------------------------------------------------------------------------
 783 // Invokes
 784 
 785 JRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* current, Method* method, address bcp))
 786   return method->orig_bytecode_at(method->bci_from(bcp));
 787 JRT_END
 788 
 789 JRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* current, Method* method, address bcp, Bytecodes::Code new_code))
 790   method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
 791 JRT_END
 792 
 793 JRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* current, Method* method, address bcp))
 794   JvmtiExport::post_raw_breakpoint(current, method, bcp);
 795 JRT_END
 796 
 797 void InterpreterRuntime::resolve_invoke(JavaThread* current, Bytecodes::Code bytecode) {
 798   LastFrameAccessor last_frame(current);
 799   // extract receiver from the outgoing argument list if necessary
 800   Handle receiver(current, nullptr);
 801   if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface ||
 802       bytecode == Bytecodes::_invokespecial) {
 803     ResourceMark rm(current);
 804     methodHandle m (current, last_frame.method());
 805     Bytecode_invoke call(m, last_frame.bci());
 806     Symbol* signature = call.signature();
 807     receiver = Handle(current, last_frame.callee_receiver(signature));
 808 
 809     assert(Universe::heap()->is_in_or_null(receiver()),
 810            "sanity check");
 811     assert(receiver.is_null() ||
 812            !Universe::heap()->is_in(receiver->klass()),
 813            "sanity check");
 814   }
 815 
 816   // resolve method
 817   CallInfo info;
 818   constantPoolHandle pool(current, last_frame.method()->constants());
 819 
 820   methodHandle resolved_method;
 821 
 822   int method_index = last_frame.get_index_u2(bytecode);
 823   {
 824     JvmtiHideSingleStepping jhss(current);
 825     JavaThread* THREAD = current; // For exception macros.
 826     LinkResolver::resolve_invoke(info, receiver, pool,
 827                                  method_index, bytecode,
 828                                  THREAD);
 829 
 830     if (HAS_PENDING_EXCEPTION) {
 831       if (ProfileTraps && PENDING_EXCEPTION->klass()->name() == vmSymbols::java_lang_NullPointerException()) {
 832         // Preserve the original exception across the call to note_trap()
 833         PreserveExceptionMark pm(current);
 834         // Recording the trap will help the compiler to potentially recognize this exception as "hot"
 835         note_trap(current, Deoptimization::Reason_null_check);
 836       }
 837       return;
 838     }
 839 
 840     resolved_method = methodHandle(current, info.resolved_method());
 841   } // end JvmtiHideSingleStepping
 842 
 843   update_invoke_cp_cache_entry(info, bytecode, resolved_method, pool, method_index);
 844 }
 845 
 846 void InterpreterRuntime::update_invoke_cp_cache_entry(CallInfo& info, Bytecodes::Code bytecode,
 847                                                       methodHandle& resolved_method,
 848                                                       constantPoolHandle& pool,
 849                                                       int method_index) {
 850   // Don't allow safepoints until the method is cached.
 851   NoSafepointVerifier nsv;
 852 
 853   // check if link resolution caused cpCache to be updated
 854   ConstantPoolCache* cache = pool->cache();
 855   if (cache->resolved_method_entry_at(method_index)->is_resolved(bytecode)) return;
 856 
 857 #ifdef ASSERT
 858   if (bytecode == Bytecodes::_invokeinterface) {
 859     if (resolved_method->method_holder() == vmClasses::Object_klass()) {
 860       // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
 861       // (see also CallInfo::set_interface for details)
 862       assert(info.call_kind() == CallInfo::vtable_call ||
 863              info.call_kind() == CallInfo::direct_call, "");
 864       assert(resolved_method->is_final() || info.has_vtable_index(),
 865              "should have been set already");
 866     } else if (!resolved_method->has_itable_index()) {
 867       // Resolved something like CharSequence.toString.  Use vtable not itable.
 868       assert(info.call_kind() != CallInfo::itable_call, "");
 869     } else {
 870       // Setup itable entry
 871       assert(info.call_kind() == CallInfo::itable_call, "");
 872       int index = resolved_method->itable_index();
 873       assert(info.itable_index() == index, "");
 874     }
 875   } else if (bytecode == Bytecodes::_invokespecial) {
 876     assert(info.call_kind() == CallInfo::direct_call, "must be direct call");
 877   } else {
 878     assert(info.call_kind() == CallInfo::direct_call ||
 879            info.call_kind() == CallInfo::vtable_call, "");
 880   }
 881 #endif
 882   // Get sender and only set cpCache entry to resolved if it is not an
 883   // interface.  The receiver for invokespecial calls within interface
 884   // methods must be checked for every call.
 885   InstanceKlass* sender = pool->pool_holder();
 886 
 887   switch (info.call_kind()) {
 888   case CallInfo::direct_call:
 889     cache->set_direct_call(bytecode, method_index, resolved_method, sender->is_interface());
 890     break;
 891   case CallInfo::vtable_call:
 892     cache->set_vtable_call(bytecode, method_index, resolved_method, info.vtable_index());
 893     break;
 894   case CallInfo::itable_call:
 895     cache->set_itable_call(
 896       bytecode,
 897       method_index,
 898       info.resolved_klass(),
 899       resolved_method,
 900       info.itable_index());
 901     break;
 902   default:  ShouldNotReachHere();
 903   }
 904 }
 905 
 906 void InterpreterRuntime::cds_resolve_invoke(Bytecodes::Code bytecode, int method_index,
 907                                             constantPoolHandle& pool, TRAPS) {
 908   LinkInfo link_info(pool, method_index, bytecode, CHECK);
 909 
 910   if (!link_info.resolved_klass()->is_instance_klass() || InstanceKlass::cast(link_info.resolved_klass())->is_linked()) {
 911     CallInfo call_info;
 912     switch (bytecode) {
 913       case Bytecodes::_invokevirtual:   LinkResolver::cds_resolve_virtual_call  (call_info, link_info, CHECK); break;
 914       case Bytecodes::_invokeinterface: LinkResolver::cds_resolve_interface_call(call_info, link_info, CHECK); break;
 915       case Bytecodes::_invokespecial:   LinkResolver::cds_resolve_special_call  (call_info, link_info, CHECK); break;
 916 
 917       default: fatal("Unimplemented: %s", Bytecodes::name(bytecode));
 918     }
 919     methodHandle resolved_method(THREAD, call_info.resolved_method());
 920     guarantee(resolved_method->method_holder()->is_linked(), "");
 921     update_invoke_cp_cache_entry(call_info, bytecode, resolved_method, pool, method_index);
 922   } else {
 923     // FIXME: why a shared class is not linked yet?
 924     // Can't link it here since there are no guarantees it'll be prelinked on the next run.
 925     ResourceMark rm;
 926     InstanceKlass* resolved_iklass = InstanceKlass::cast(link_info.resolved_klass());
 927     log_info(aot, resolve)("Not resolved: class not linked: %s %s %s",
 928                            resolved_iklass->is_shared() ? "is_shared" : "",
 929                            resolved_iklass->init_state_name(),
 930                            resolved_iklass->external_name());
 931   }
 932 }
 933 
 934 // First time execution:  Resolve symbols, create a permanent MethodType object.
 935 void InterpreterRuntime::resolve_invokehandle(JavaThread* current) {
 936   const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
 937   LastFrameAccessor last_frame(current);
 938 
 939   // resolve method
 940   CallInfo info;
 941   constantPoolHandle pool(current, last_frame.method()->constants());
 942   int method_index = last_frame.get_index_u2(bytecode);
 943   {
 944     JvmtiHideSingleStepping jhss(current);
 945     JavaThread* THREAD = current; // For exception macros.
 946     LinkResolver::resolve_invoke(info, Handle(), pool,
 947                                  method_index, bytecode,
 948                                  CHECK);
 949   } // end JvmtiHideSingleStepping
 950 
 951   pool->cache()->set_method_handle(method_index, info);
 952 }
 953 
 954 void InterpreterRuntime::cds_resolve_invokehandle(int raw_index,
 955                                                   constantPoolHandle& pool, TRAPS) {
 956   const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
 957   CallInfo info;
 958   LinkResolver::resolve_invoke(info, Handle(), pool, raw_index, bytecode, CHECK);
 959 
 960   pool->cache()->set_method_handle(raw_index, info);
 961 }
 962 
 963 // First time execution:  Resolve symbols, create a permanent CallSite object.
 964 void InterpreterRuntime::resolve_invokedynamic(JavaThread* current) {
 965   LastFrameAccessor last_frame(current);
 966   const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
 967 
 968   // resolve method
 969   CallInfo info;
 970   constantPoolHandle pool(current, last_frame.method()->constants());
 971   int index = last_frame.get_index_u4(bytecode);
 972   {
 973     JvmtiHideSingleStepping jhss(current);
 974     JavaThread* THREAD = current; // For exception macros.
 975     LinkResolver::resolve_invoke(info, Handle(), pool,
 976                                  index, bytecode, CHECK);
 977   } // end JvmtiHideSingleStepping
 978 
 979   pool->cache()->set_dynamic_call(info, index);
 980 }
 981 
 982 void InterpreterRuntime::cds_resolve_invokedynamic(int raw_index,
 983                                                    constantPoolHandle& pool, TRAPS) {
 984   const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
 985   CallInfo info;
 986   LinkResolver::resolve_invoke(info, Handle(), pool, raw_index, bytecode, CHECK);
 987   pool->cache()->set_dynamic_call(info, raw_index);
 988 }
 989 
 990 // This function is the interface to the assembly code. It returns the resolved
 991 // cpCache entry.  This doesn't safepoint, but the helper routines safepoint.
 992 // This function will check for redefinition!
 993 JRT_ENTRY(void, InterpreterRuntime::resolve_from_cache(JavaThread* current, Bytecodes::Code bytecode)) {
 994   switch (bytecode) {
 995   case Bytecodes::_getstatic:
 996   case Bytecodes::_putstatic:
 997   case Bytecodes::_getfield:
 998   case Bytecodes::_putfield:
 999     resolve_get_put(current, bytecode);
1000     break;
1001   case Bytecodes::_invokevirtual:
1002   case Bytecodes::_invokespecial:
1003   case Bytecodes::_invokestatic:
1004   case Bytecodes::_invokeinterface:
1005     resolve_invoke(current, bytecode);
1006     break;
1007   case Bytecodes::_invokehandle:
1008     resolve_invokehandle(current);
1009     break;
1010   case Bytecodes::_invokedynamic:
1011     resolve_invokedynamic(current);
1012     break;
1013   default:
1014     fatal("unexpected bytecode: %s", Bytecodes::name(bytecode));
1015     break;
1016   }
1017 }
1018 JRT_END
1019 
1020 //------------------------------------------------------------------------------------------------------------------------
1021 // Miscellaneous
1022 
1023 
1024 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* current, address branch_bcp) {
1025   // Enable WXWrite: the function is called directly by interpreter.
1026   MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXWrite, current));
1027 
1028   // frequency_counter_overflow_inner can throw async exception.
1029   nmethod* nm = frequency_counter_overflow_inner(current, branch_bcp);
1030   assert(branch_bcp != nullptr || nm == nullptr, "always returns null for non OSR requests");
1031   if (branch_bcp != nullptr && nm != nullptr) {
1032     // This was a successful request for an OSR nmethod.  Because
1033     // frequency_counter_overflow_inner ends with a safepoint check,
1034     // nm could have been unloaded so look it up again.  It's unsafe
1035     // to examine nm directly since it might have been freed and used
1036     // for something else.
1037     LastFrameAccessor last_frame(current);
1038     Method* method =  last_frame.method();
1039     int bci = method->bci_from(last_frame.bcp());
1040     nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
1041     BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1042     if (nm != nullptr) {
1043       // in case the transition passed a safepoint we need to barrier this again
1044       if (!bs_nm->nmethod_osr_entry_barrier(nm)) {
1045         nm = nullptr;
1046       }
1047     }
1048   }
1049   if (nm != nullptr && current->is_interp_only_mode()) {
1050     // Normally we never get an nm if is_interp_only_mode() is true, because
1051     // policy()->event has a check for this and won't compile the method when
1052     // true. However, it's possible for is_interp_only_mode() to become true
1053     // during the compilation. We don't want to return the nm in that case
1054     // because we want to continue to execute interpreted.
1055     nm = nullptr;
1056   }
1057 #ifndef PRODUCT
1058   if (TraceOnStackReplacement) {
1059     if (nm != nullptr) {
1060       tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", p2i(nm->osr_entry()));
1061       nm->print();
1062     }
1063   }
1064 #endif
1065   return nm;
1066 }
1067 
1068 JRT_ENTRY(nmethod*,
1069           InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* current, address branch_bcp))
1070   // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
1071   // flag, in case this method triggers classloading which will call into Java.
1072   UnlockFlagSaver fs(current);
1073 
1074   LastFrameAccessor last_frame(current);
1075   assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1076   methodHandle method(current, last_frame.method());
1077   const int branch_bci = branch_bcp != nullptr ? method->bci_from(branch_bcp) : InvocationEntryBci;
1078   const int bci = branch_bcp != nullptr ? method->bci_from(last_frame.bcp()) : InvocationEntryBci;
1079 
1080   nmethod* osr_nm = CompilationPolicy::event(method, method, branch_bci, bci, CompLevel_none, nullptr, CHECK_NULL);
1081 
1082   BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1083   if (osr_nm != nullptr) {
1084     if (!bs_nm->nmethod_osr_entry_barrier(osr_nm)) {
1085       osr_nm = nullptr;
1086     }
1087   }
1088   return osr_nm;
1089 JRT_END
1090 
1091 JRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp))
1092   assert(ProfileInterpreter, "must be profiling interpreter");
1093   int bci = method->bci_from(cur_bcp);
1094   MethodData* mdo = method->method_data();
1095   if (mdo == nullptr)  return 0;
1096   return mdo->bci_to_di(bci);
1097 JRT_END
1098 
1099 #ifdef ASSERT
1100 JRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp))
1101   assert(ProfileInterpreter, "must be profiling interpreter");
1102 
1103   MethodData* mdo = method->method_data();
1104   assert(mdo != nullptr, "must not be null");
1105 
1106   int bci = method->bci_from(bcp);
1107 
1108   address mdp2 = mdo->bci_to_dp(bci);
1109   if (mdp != mdp2) {
1110     ResourceMark rm;
1111     tty->print_cr("FAILED verify : actual mdp %p   expected mdp %p @ bci %d", mdp, mdp2, bci);
1112     int current_di = mdo->dp_to_di(mdp);
1113     int expected_di  = mdo->dp_to_di(mdp2);
1114     tty->print_cr("  actual di %d   expected di %d", current_di, expected_di);
1115     int expected_approx_bci = mdo->data_at(expected_di)->bci();
1116     int approx_bci = -1;
1117     if (current_di >= 0) {
1118       approx_bci = mdo->data_at(current_di)->bci();
1119     }
1120     tty->print_cr("  actual bci is %d  expected bci %d", approx_bci, expected_approx_bci);
1121     mdo->print_on(tty);
1122     method->print_codes();
1123   }
1124   assert(mdp == mdp2, "wrong mdp");
1125 JRT_END
1126 #endif // ASSERT
1127 
1128 JRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* current, int return_bci))
1129   assert(ProfileInterpreter, "must be profiling interpreter");
1130   ResourceMark rm(current);
1131   LastFrameAccessor last_frame(current);
1132   assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1133   MethodData* h_mdo = last_frame.method()->method_data();
1134 
1135   // Grab a lock to ensure atomic access to setting the return bci and
1136   // the displacement.  This can block and GC, invalidating all naked oops.
1137   MutexLocker ml(RetData_lock);
1138 
1139   // ProfileData is essentially a wrapper around a derived oop, so we
1140   // need to take the lock before making any ProfileData structures.
1141   ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(last_frame.mdp()));
1142   guarantee(data != nullptr, "profile data must be valid");
1143   RetData* rdata = data->as_RetData();
1144   address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
1145   last_frame.set_mdp(new_mdp);
1146 JRT_END
1147 
1148 JRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* current, Method* m))
1149   return Method::build_method_counters(current, m);
1150 JRT_END
1151 
1152 
1153 JRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* current))
1154   // We used to need an explicit preserve_arguments here for invoke bytecodes. However,
1155   // stack traversal automatically takes care of preserving arguments for invoke, so
1156   // this is no longer needed.
1157 
1158   // JRT_END does an implicit safepoint check, hence we are guaranteed to block
1159   // if this is called during a safepoint
1160 
1161   if (JvmtiExport::should_post_single_step()) {
1162     // This function is called by the interpreter when single stepping. Such single
1163     // stepping could unwind a frame. Then, it is important that we process any frames
1164     // that we might return into.
1165     StackWatermarkSet::before_unwind(current);
1166 
1167     // We are called during regular safepoints and when the VM is
1168     // single stepping. If any thread is marked for single stepping,
1169     // then we may have JVMTI work to do.
1170     LastFrameAccessor last_frame(current);
1171     JvmtiExport::at_single_stepping_point(current, last_frame.method(), last_frame.bcp());
1172   }
1173 JRT_END
1174 
1175 JRT_LEAF(void, InterpreterRuntime::at_unwind(JavaThread* current))
1176   assert(current == JavaThread::current(), "pre-condition");
1177   JFR_ONLY(Jfr::check_and_process_sample_request(current);)
1178   // This function is called by the interpreter when the return poll found a reason
1179   // to call the VM. The reason could be that we are returning into a not yet safe
1180   // to access frame. We handle that below.
1181   // Note that this path does not check for single stepping, because we do not want
1182   // to single step when unwinding frames for an exception being thrown. Instead,
1183   // such single stepping code will use the safepoint table, which will use the
1184   // InterpreterRuntime::at_safepoint callback.
1185   StackWatermarkSet::before_unwind(current);
1186 JRT_END
1187 
1188 JRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread* current, oopDesc* obj,
1189                                                       ResolvedFieldEntry *entry))
1190 
1191   // check the access_flags for the field in the klass
1192 
1193   InstanceKlass* ik = entry->field_holder();
1194   int index = entry->field_index();
1195   if (!ik->field_status(index).is_access_watched()) return;
1196 
1197   bool is_static = (obj == nullptr);
1198   HandleMark hm(current);
1199 
1200   Handle h_obj;
1201   if (!is_static) {
1202     // non-static field accessors have an object, but we need a handle
1203     h_obj = Handle(current, obj);
1204   }
1205   InstanceKlass* field_holder = entry->field_holder(); // HERE
1206   jfieldID fid = jfieldIDWorkaround::to_jfieldID(field_holder, entry->field_offset(), is_static);
1207   LastFrameAccessor last_frame(current);
1208   JvmtiExport::post_field_access(current, last_frame.method(), last_frame.bcp(), field_holder, h_obj, fid);
1209 JRT_END
1210 
1211 JRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread* current, oopDesc* obj,
1212                                                             ResolvedFieldEntry *entry, jvalue *value))
1213 
1214   InstanceKlass* ik = entry->field_holder();
1215 
1216   // check the access_flags for the field in the klass
1217   int index = entry->field_index();
1218   // bail out if field modifications are not watched
1219   if (!ik->field_status(index).is_modification_watched()) return;
1220 
1221   char sig_type = '\0';
1222 
1223   switch((TosState)entry->tos_state()) {
1224     case btos: sig_type = JVM_SIGNATURE_BYTE;    break;
1225     case ztos: sig_type = JVM_SIGNATURE_BOOLEAN; break;
1226     case ctos: sig_type = JVM_SIGNATURE_CHAR;    break;
1227     case stos: sig_type = JVM_SIGNATURE_SHORT;   break;
1228     case itos: sig_type = JVM_SIGNATURE_INT;     break;
1229     case ftos: sig_type = JVM_SIGNATURE_FLOAT;   break;
1230     case atos: sig_type = JVM_SIGNATURE_CLASS;   break;
1231     case ltos: sig_type = JVM_SIGNATURE_LONG;    break;
1232     case dtos: sig_type = JVM_SIGNATURE_DOUBLE;  break;
1233     default:  ShouldNotReachHere(); return;
1234   }
1235   bool is_static = (obj == nullptr);
1236 
1237   HandleMark hm(current);
1238   jfieldID fid = jfieldIDWorkaround::to_jfieldID(ik, entry->field_offset(), is_static);
1239   jvalue fvalue;
1240 #ifdef _LP64
1241   fvalue = *value;
1242 #else
1243   // Long/double values are stored unaligned and also noncontiguously with
1244   // tagged stacks.  We can't just do a simple assignment even in the non-
1245   // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1246   // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1247   // We assume that the two halves of longs/doubles are stored in interpreter
1248   // stack slots in platform-endian order.
1249   jlong_accessor u;
1250   jint* newval = (jint*)value;
1251   u.words[0] = newval[0];
1252   u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1253   fvalue.j = u.long_value;
1254 #endif // _LP64
1255 
1256   Handle h_obj;
1257   if (!is_static) {
1258     // non-static field accessors have an object, but we need a handle
1259     h_obj = Handle(current, obj);
1260   }
1261 
1262   LastFrameAccessor last_frame(current);
1263   JvmtiExport::post_raw_field_modification(current, last_frame.method(), last_frame.bcp(), ik, h_obj,
1264                                            fid, sig_type, &fvalue);
1265 JRT_END
1266 
1267 JRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread* current))
1268   LastFrameAccessor last_frame(current);
1269   JvmtiExport::post_method_entry(current, last_frame.method(), last_frame.get_frame());
1270 JRT_END
1271 
1272 
1273 // This is a JRT_BLOCK_ENTRY because we have to stash away the return oop
1274 // before transitioning to VM, and restore it after transitioning back
1275 // to Java. The return oop at the top-of-stack, is not walked by the GC.
1276 JRT_BLOCK_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread* current))
1277   LastFrameAccessor last_frame(current);
1278   JvmtiExport::post_method_exit(current, last_frame.method(), last_frame.get_frame());
1279 JRT_END
1280 
1281 JRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1282 {
1283   return (Interpreter::contains(Continuation::get_top_return_pc_post_barrier(JavaThread::current(), pc)) ? 1 : 0);
1284 }
1285 JRT_END
1286 
1287 
1288 // Implementation of SignatureHandlerLibrary
1289 
1290 #ifndef SHARING_FAST_NATIVE_FINGERPRINTS
1291 // Dummy definition (else normalization method is defined in CPU
1292 // dependent code)
1293 uint64_t InterpreterRuntime::normalize_fast_native_fingerprint(uint64_t fingerprint) {
1294   return fingerprint;
1295 }
1296 #endif
1297 
1298 address SignatureHandlerLibrary::set_handler_blob() {
1299   BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1300   if (handler_blob == nullptr) {
1301     return nullptr;
1302   }
1303   address handler = handler_blob->code_begin();
1304   _handler_blob = handler_blob;
1305   _handler = handler;
1306   return handler;
1307 }
1308 
1309 void SignatureHandlerLibrary::initialize() {
1310   if (_fingerprints != nullptr) {
1311     return;
1312   }
1313   if (set_handler_blob() == nullptr) {
1314     vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers");
1315   }
1316 
1317   BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1318                                       SignatureHandlerLibrary::buffer_size);
1319   _buffer = bb->code_begin();
1320 
1321   _fingerprints = new (mtCode) GrowableArray<uint64_t>(32, mtCode);
1322   _handlers     = new (mtCode) GrowableArray<address>(32, mtCode);
1323 }
1324 
1325 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1326   address handler   = _handler;
1327   int     insts_size = buffer->pure_insts_size();
1328   if (handler + insts_size > _handler_blob->code_end()) {
1329     // get a new handler blob
1330     handler = set_handler_blob();
1331   }
1332   if (handler != nullptr) {
1333     memcpy(handler, buffer->insts_begin(), insts_size);
1334     pd_set_handler(handler);
1335     ICache::invalidate_range(handler, insts_size);
1336     _handler = handler + insts_size;
1337   }
1338   return handler;
1339 }
1340 
1341 void SignatureHandlerLibrary::add(const methodHandle& method) {
1342   if (method->signature_handler() == nullptr) {
1343     // use slow signature handler if we can't do better
1344     int handler_index = -1;
1345     // check if we can use customized (fast) signature handler
1346     if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::fp_max_size_of_parameters) {
1347       // use customized signature handler
1348       MutexLocker mu(SignatureHandlerLibrary_lock);
1349       // make sure data structure is initialized
1350       initialize();
1351       // lookup method signature's fingerprint
1352       uint64_t fingerprint = Fingerprinter(method).fingerprint();
1353       // allow CPU dependent code to optimize the fingerprints for the fast handler
1354       fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1355       handler_index = _fingerprints->find(fingerprint);
1356       // create handler if necessary
1357       if (handler_index < 0) {
1358         ResourceMark rm;
1359         ptrdiff_t align_offset = align_up(_buffer, CodeEntryAlignment) - (address)_buffer;
1360         CodeBuffer buffer((address)(_buffer + align_offset),
1361                           checked_cast<int>(SignatureHandlerLibrary::buffer_size - align_offset));
1362         InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1363         // copy into code heap
1364         address handler = set_handler(&buffer);
1365         if (handler == nullptr) {
1366           // use slow signature handler (without memorizing it in the fingerprints)
1367         } else {
1368           // debugging support
1369           if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1370             ttyLocker ttyl;
1371             tty->cr();
1372             tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1373                           _handlers->length(),
1374                           (method->is_static() ? "static" : "receiver"),
1375                           method->name_and_sig_as_C_string(),
1376                           fingerprint,
1377                           buffer.insts_size());
1378             if (buffer.insts_size() > 0) {
1379               Disassembler::decode(handler, handler + buffer.insts_size(), tty
1380                                    NOT_PRODUCT(COMMA &buffer.asm_remarks()));
1381             }
1382 #ifndef PRODUCT
1383             address rh_begin = Interpreter::result_handler(method()->result_type());
1384             if (CodeCache::contains(rh_begin)) {
1385               // else it might be special platform dependent values
1386               tty->print_cr(" --- associated result handler ---");
1387               address rh_end = rh_begin;
1388               while (*(int*)rh_end != 0) {
1389                 rh_end += sizeof(int);
1390               }
1391               Disassembler::decode(rh_begin, rh_end);
1392             } else {
1393               tty->print_cr(" associated result handler: " PTR_FORMAT, p2i(rh_begin));
1394             }
1395 #endif
1396           }
1397           // add handler to library
1398           _fingerprints->append(fingerprint);
1399           _handlers->append(handler);
1400           // set handler index
1401           assert(_fingerprints->length() == _handlers->length(), "sanity check");
1402           handler_index = _fingerprints->length() - 1;
1403         }
1404       }
1405       // Set handler under SignatureHandlerLibrary_lock
1406       if (handler_index < 0) {
1407         // use generic signature handler
1408         method->set_signature_handler(Interpreter::slow_signature_handler());
1409       } else {
1410         // set handler
1411         method->set_signature_handler(_handlers->at(handler_index));
1412       }
1413     } else {
1414       DEBUG_ONLY(JavaThread::current()->check_possible_safepoint());
1415       // use generic signature handler
1416       method->set_signature_handler(Interpreter::slow_signature_handler());
1417     }
1418   }
1419 #ifdef ASSERT
1420   int handler_index = -1;
1421   int fingerprint_index = -2;
1422   {
1423     // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized
1424     // in any way if accessed from multiple threads. To avoid races with another
1425     // thread which may change the arrays in the above, mutex protected block, we
1426     // have to protect this read access here with the same mutex as well!
1427     MutexLocker mu(SignatureHandlerLibrary_lock);
1428     if (_handlers != nullptr) {
1429       handler_index = _handlers->find(method->signature_handler());
1430       uint64_t fingerprint = Fingerprinter(method).fingerprint();
1431       fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1432       fingerprint_index = _fingerprints->find(fingerprint);
1433     }
1434   }
1435   assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1436          handler_index == fingerprint_index, "sanity check");
1437 #endif // ASSERT
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_oop 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_oop(member_name_oop);
1506   } else {
1507     current->set_vm_result_oop(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