1 /*
   2  * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/systemDictionary.hpp"
  27 #include "classfile/vmSymbols.hpp"
  28 #include "compiler/compileBroker.hpp"
  29 #include "compiler/disassembler.hpp"
  30 #include "gc_interface/collectedHeap.hpp"
  31 #include "interpreter/interpreter.hpp"
  32 #include "interpreter/interpreterRuntime.hpp"
  33 #include "interpreter/linkResolver.hpp"
  34 #include "interpreter/templateTable.hpp"
  35 #include "memory/oopFactory.hpp"
  36 #include "memory/universe.inline.hpp"
  37 #include "oops/constantPool.hpp"
  38 #include "oops/instanceKlass.hpp"
  39 #include "oops/methodData.hpp"
  40 #include "oops/objArrayKlass.hpp"
  41 #include "oops/oop.inline.hpp"
  42 #include "oops/symbol.hpp"
  43 #include "prims/jvmtiExport.hpp"
  44 #include "prims/nativeLookup.hpp"
  45 #include "runtime/biasedLocking.hpp"
  46 #include "runtime/compilationPolicy.hpp"
  47 #include "runtime/deoptimization.hpp"
  48 #include "runtime/fieldDescriptor.hpp"
  49 #include "runtime/handles.inline.hpp"
  50 #include "runtime/interfaceSupport.hpp"
  51 #include "runtime/java.hpp"
  52 #include "runtime/jfieldIDWorkaround.hpp"
  53 #include "runtime/osThread.hpp"
  54 #include "runtime/sharedRuntime.hpp"
  55 #include "runtime/stubRoutines.hpp"
  56 #include "runtime/synchronizer.hpp"
  57 #include "runtime/threadCritical.hpp"
  58 #include "utilities/events.hpp"
  59 #ifdef TARGET_ARCH_x86
  60 # include "vm_version_x86.hpp"
  61 #endif
  62 #ifdef TARGET_ARCH_sparc
  63 # include "vm_version_sparc.hpp"
  64 #endif
  65 #ifdef TARGET_ARCH_zero
  66 # include "vm_version_zero.hpp"
  67 #endif
  68 #ifdef TARGET_ARCH_arm
  69 # include "vm_version_arm.hpp"
  70 #endif
  71 #ifdef TARGET_ARCH_ppc
  72 # include "vm_version_ppc.hpp"
  73 #endif
  74 #ifdef COMPILER2
  75 #include "opto/runtime.hpp"
  76 #endif
  77 
  78 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
  79 
  80 class UnlockFlagSaver {
  81   private:
  82     JavaThread* _thread;
  83     bool _do_not_unlock;
  84   public:
  85     UnlockFlagSaver(JavaThread* t) {
  86       _thread = t;
  87       _do_not_unlock = t->do_not_unlock_if_synchronized();
  88       t->set_do_not_unlock_if_synchronized(false);
  89     }
  90     ~UnlockFlagSaver() {
  91       _thread->set_do_not_unlock_if_synchronized(_do_not_unlock);
  92     }
  93 };
  94 
  95 //------------------------------------------------------------------------------------------------------------------------
  96 // State accessors
  97 
  98 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread *thread) {
  99   last_frame(thread).interpreter_frame_set_bcp(bcp);
 100   if (ProfileInterpreter) {
 101     // ProfileTraps uses MDOs independently of ProfileInterpreter.
 102     // That is why we must check both ProfileInterpreter and mdo != NULL.
 103     MethodData* mdo = last_frame(thread).interpreter_frame_method()->method_data();
 104     if (mdo != NULL) {
 105       NEEDS_CLEANUP;
 106       last_frame(thread).interpreter_frame_set_mdp(mdo->bci_to_dp(last_frame(thread).interpreter_frame_bci()));
 107     }
 108   }
 109 }
 110 
 111 //------------------------------------------------------------------------------------------------------------------------
 112 // Constants
 113 
 114 
 115 IRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* thread, bool wide))
 116   // access constant pool
 117   ConstantPool* pool = method(thread)->constants();
 118   int index = wide ? get_index_u2(thread, Bytecodes::_ldc_w) : get_index_u1(thread, Bytecodes::_ldc);
 119   constantTag tag = pool->tag_at(index);
 120 
 121   assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call");
 122   Klass* klass = pool->klass_at(index, CHECK);
 123     oop java_class = klass->java_mirror();
 124     thread->set_vm_result(java_class);
 125 IRT_END
 126 
 127 IRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* thread, Bytecodes::Code bytecode)) {
 128   assert(bytecode == Bytecodes::_fast_aldc ||
 129          bytecode == Bytecodes::_fast_aldc_w, "wrong bc");
 130   ResourceMark rm(thread);
 131   methodHandle m (thread, method(thread));
 132   Bytecode_loadconstant ldc(m, bci(thread));
 133   oop result = ldc.resolve_constant(CHECK);
 134 #ifdef ASSERT
 135   {
 136     // The bytecode wrappers aren't GC-safe so construct a new one
 137     Bytecode_loadconstant ldc2(m, bci(thread));
 138     oop coop = m->constants()->resolved_references()->obj_at(ldc2.cache_index());
 139     assert(result == coop, "expected result for assembly code");
 140   }
 141 #endif
 142   thread->set_vm_result(result);
 143 }
 144 IRT_END
 145 
 146 
 147 //------------------------------------------------------------------------------------------------------------------------
 148 // Allocation
 149 
 150 IRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* thread, ConstantPool* pool, int index))
 151   Klass* k_oop = pool->klass_at(index, CHECK);
 152   instanceKlassHandle klass (THREAD, k_oop);
 153 
 154   // Make sure we are not instantiating an abstract klass
 155   klass->check_valid_for_instantiation(true, CHECK);
 156 
 157   // Make sure klass is initialized
 158   klass->initialize(CHECK);
 159 
 160   // At this point the class may not be fully initialized
 161   // because of recursive initialization. If it is fully
 162   // initialized & has_finalized is not set, we rewrite
 163   // it into its fast version (Note: no locking is needed
 164   // here since this is an atomic byte write and can be
 165   // done more than once).
 166   //
 167   // Note: In case of classes with has_finalized we don't
 168   //       rewrite since that saves us an extra check in
 169   //       the fast version which then would call the
 170   //       slow version anyway (and do a call back into
 171   //       Java).
 172   //       If we have a breakpoint, then we don't rewrite
 173   //       because the _breakpoint bytecode would be lost.
 174   oop obj = klass->allocate_instance(CHECK);
 175   thread->set_vm_result(obj);
 176 IRT_END
 177 
 178 
 179 IRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* thread, BasicType type, jint size))
 180   oop obj = oopFactory::new_typeArray(type, size, CHECK);
 181   thread->set_vm_result(obj);
 182 IRT_END
 183 
 184 
 185 IRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* thread, ConstantPool* pool, int index, jint size))
 186   // Note: no oopHandle for pool & klass needed since they are not used
 187   //       anymore after new_objArray() and no GC can happen before.
 188   //       (This may have to change if this code changes!)
 189   Klass*    klass = pool->klass_at(index, CHECK);
 190   objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
 191   thread->set_vm_result(obj);
 192 IRT_END
 193 
 194 
 195 IRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* thread, jint* first_size_address))
 196   // We may want to pass in more arguments - could make this slightly faster
 197   ConstantPool* constants = method(thread)->constants();
 198   int          i = get_index_u2(thread, Bytecodes::_multianewarray);
 199   Klass* klass = constants->klass_at(i, CHECK);
 200   int   nof_dims = number_of_dimensions(thread);
 201   assert(klass->is_klass(), "not a class");
 202   assert(nof_dims >= 1, "multianewarray rank must be nonzero");
 203 
 204   // We must create an array of jints to pass to multi_allocate.
 205   ResourceMark rm(thread);
 206   const int small_dims = 10;
 207   jint dim_array[small_dims];
 208   jint *dims = &dim_array[0];
 209   if (nof_dims > small_dims) {
 210     dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
 211   }
 212   for (int index = 0; index < nof_dims; index++) {
 213     // offset from first_size_address is addressed as local[index]
 214     int n = Interpreter::local_offset_in_bytes(index)/jintSize;
 215     dims[index] = first_size_address[n];
 216   }
 217   oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
 218   thread->set_vm_result(obj);
 219 IRT_END
 220 
 221 
 222 IRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))
 223   assert(obj->is_oop(), "must be a valid oop");
 224   assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
 225   InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
 226 IRT_END
 227 
 228 
 229 // Quicken instance-of and check-cast bytecodes
 230 IRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* thread))
 231   // Force resolving; quicken the bytecode
 232   int which = get_index_u2(thread, Bytecodes::_checkcast);
 233   ConstantPool* cpool = method(thread)->constants();
 234   // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
 235   // program we might have seen an unquick'd bytecode in the interpreter but have another
 236   // thread quicken the bytecode before we get here.
 237   // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
 238   Klass* klass = cpool->klass_at(which, CHECK);
 239   thread->set_vm_result_2(klass);
 240 IRT_END
 241 
 242 
 243 //------------------------------------------------------------------------------------------------------------------------
 244 // Exceptions
 245 
 246 void InterpreterRuntime::note_trap_inner(JavaThread* thread, int reason,
 247                                          methodHandle trap_method, int trap_bci, TRAPS) {
 248   if (trap_method.not_null()) {
 249     MethodData* trap_mdo = trap_method->method_data();
 250     if (trap_mdo == NULL) {
 251       Method::build_interpreter_method_data(trap_method, THREAD);
 252       if (HAS_PENDING_EXCEPTION) {
 253         assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())),
 254                "we expect only an OOM error here");
 255         CLEAR_PENDING_EXCEPTION;
 256       }
 257       trap_mdo = trap_method->method_data();
 258       // and fall through...
 259     }
 260     if (trap_mdo != NULL) {
 261       // Update per-method count of trap events.  The interpreter
 262       // is updating the MDO to simulate the effect of compiler traps.
 263       Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
 264     }
 265   }
 266 }
 267 
 268 // Assume the compiler is (or will be) interested in this event.
 269 // If necessary, create an MDO to hold the information, and record it.
 270 void InterpreterRuntime::note_trap(JavaThread* thread, int reason, TRAPS) {
 271   assert(ProfileTraps, "call me only if profiling");
 272   methodHandle trap_method(thread, method(thread));
 273   int trap_bci = trap_method->bci_from(bcp(thread));
 274   note_trap_inner(thread, reason, trap_method, trap_bci, THREAD);
 275 }
 276 
 277 #ifdef CC_INTERP
 278 // As legacy note_trap, but we have more arguments.
 279 IRT_ENTRY(void, InterpreterRuntime::note_trap(JavaThread* thread, int reason, Method *method, int trap_bci))
 280   methodHandle trap_method(method);
 281   note_trap_inner(thread, reason, trap_method, trap_bci, THREAD);
 282 IRT_END
 283 
 284 // Class Deoptimization is not visible in BytecodeInterpreter, so we need a wrapper
 285 // for each exception.
 286 void InterpreterRuntime::note_nullCheck_trap(JavaThread* thread, Method *method, int trap_bci)
 287   { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_null_check, method, trap_bci); }
 288 void InterpreterRuntime::note_div0Check_trap(JavaThread* thread, Method *method, int trap_bci)
 289   { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_div0_check, method, trap_bci); }
 290 void InterpreterRuntime::note_rangeCheck_trap(JavaThread* thread, Method *method, int trap_bci)
 291   { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_range_check, method, trap_bci); }
 292 void InterpreterRuntime::note_classCheck_trap(JavaThread* thread, Method *method, int trap_bci)
 293   { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_class_check, method, trap_bci); }
 294 void InterpreterRuntime::note_arrayCheck_trap(JavaThread* thread, Method *method, int trap_bci)
 295   { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_array_check, method, trap_bci); }
 296 #endif // CC_INTERP
 297 
 298 
 299 static Handle get_preinitialized_exception(Klass* k, TRAPS) {
 300   // get klass
 301   InstanceKlass* klass = InstanceKlass::cast(k);
 302   assert(klass->is_initialized(),
 303          "this klass should have been initialized during VM initialization");
 304   // create instance - do not call constructor since we may have no
 305   // (java) stack space left (should assert constructor is empty)
 306   Handle exception;
 307   oop exception_oop = klass->allocate_instance(CHECK_(exception));
 308   exception = Handle(THREAD, exception_oop);
 309   if (StackTraceInThrowable) {
 310     java_lang_Throwable::fill_in_stack_trace(exception);
 311   }
 312   return exception;
 313 }
 314 
 315 // Special handling for stack overflow: since we don't have any (java) stack
 316 // space left we use the pre-allocated & pre-initialized StackOverflowError
 317 // klass to create an stack overflow error instance.  We do not call its
 318 // constructor for the same reason (it is empty, anyway).
 319 IRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* thread))
 320   Handle exception = get_preinitialized_exception(
 321                                  SystemDictionary::StackOverflowError_klass(),
 322                                  CHECK);
 323   // Increment counter for hs_err file reporting
 324   Atomic::inc(&Exceptions::_stack_overflow_errors);
 325   THROW_HANDLE(exception);
 326 IRT_END
 327 
 328 
 329 IRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* thread, char* name, char* message))
 330   // lookup exception klass
 331   TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
 332   if (ProfileTraps) {
 333     if (s == vmSymbols::java_lang_ArithmeticException()) {
 334       note_trap(thread, Deoptimization::Reason_div0_check, CHECK);
 335     } else if (s == vmSymbols::java_lang_NullPointerException()) {
 336       note_trap(thread, Deoptimization::Reason_null_check, CHECK);
 337     }
 338   }
 339   // create exception
 340   Handle exception = Exceptions::new_exception(thread, s, message);
 341   thread->set_vm_result(exception());
 342 IRT_END
 343 
 344 
 345 IRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* thread, char* name, oopDesc* obj))
 346   ResourceMark rm(thread);
 347   const char* klass_name = obj->klass()->external_name();
 348   // lookup exception klass
 349   TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
 350   if (ProfileTraps) {
 351     note_trap(thread, Deoptimization::Reason_class_check, CHECK);
 352   }
 353   // create exception, with klass name as detail message
 354   Handle exception = Exceptions::new_exception(thread, s, klass_name);
 355   thread->set_vm_result(exception());
 356 IRT_END
 357 
 358 
 359 IRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* thread, char* name, jint index))
 360   char message[jintAsStringSize];
 361   // lookup exception klass
 362   TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
 363   if (ProfileTraps) {
 364     note_trap(thread, Deoptimization::Reason_range_check, CHECK);
 365   }
 366   // create exception
 367   sprintf(message, "%d", index);
 368   THROW_MSG(s, message);
 369 IRT_END
 370 
 371 IRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
 372   JavaThread* thread, oopDesc* obj))
 373 
 374   ResourceMark rm(thread);
 375   char* message = SharedRuntime::generate_class_cast_message(
 376     thread, obj->klass()->external_name());
 377 
 378   if (ProfileTraps) {
 379     note_trap(thread, Deoptimization::Reason_class_check, CHECK);
 380   }
 381 
 382   // create exception
 383   THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
 384 IRT_END
 385 
 386 // exception_handler_for_exception(...) returns the continuation address,
 387 // the exception oop (via TLS) and sets the bci/bcp for the continuation.
 388 // The exception oop is returned to make sure it is preserved over GC (it
 389 // is only on the stack if the exception was thrown explicitly via athrow).
 390 // During this operation, the expression stack contains the values for the
 391 // bci where the exception happened. If the exception was propagated back
 392 // from a call, the expression stack contains the values for the bci at the
 393 // invoke w/o arguments (i.e., as if one were inside the call).
 394 IRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* thread, oopDesc* exception))
 395 
 396   Handle             h_exception(thread, exception);
 397   methodHandle       h_method   (thread, method(thread));
 398   constantPoolHandle h_constants(thread, h_method->constants());
 399   bool               should_repeat;
 400   int                handler_bci;
 401   int                current_bci = bci(thread);
 402 
 403   if (thread->frames_to_pop_failed_realloc() > 0) {
 404     // Allocation of scalar replaced object used in this frame
 405     // failed. Unconditionally pop the frame.
 406     thread->dec_frames_to_pop_failed_realloc();
 407     thread->set_vm_result(h_exception());
 408     // If the method is synchronized we already unlocked the monitor
 409     // during deoptimization so the interpreter needs to skip it when
 410     // the frame is popped.
 411     thread->set_do_not_unlock_if_synchronized(true);
 412 #ifdef CC_INTERP
 413     return (address) -1;
 414 #else
 415     return Interpreter::remove_activation_entry();
 416 #endif
 417   }
 418 
 419   // Need to do this check first since when _do_not_unlock_if_synchronized
 420   // is set, we don't want to trigger any classloading which may make calls
 421   // into java, or surprisingly find a matching exception handler for bci 0
 422   // since at this moment the method hasn't been "officially" entered yet.
 423   if (thread->do_not_unlock_if_synchronized()) {
 424     ResourceMark rm;
 425     assert(current_bci == 0,  "bci isn't zero for do_not_unlock_if_synchronized");
 426     thread->set_vm_result(exception);
 427 #ifdef CC_INTERP
 428     return (address) -1;
 429 #else
 430     return Interpreter::remove_activation_entry();
 431 #endif
 432   }
 433 
 434   do {
 435     should_repeat = false;
 436 
 437     // assertions
 438 #ifdef ASSERT
 439     assert(h_exception.not_null(), "NULL exceptions should be handled by athrow");
 440     assert(h_exception->is_oop(), "just checking");
 441     // Check that exception is a subclass of Throwable, otherwise we have a VerifyError
 442     if (!(h_exception->is_a(SystemDictionary::Throwable_klass()))) {
 443       if (ExitVMOnVerifyError) vm_exit(-1);
 444       ShouldNotReachHere();
 445     }
 446 #endif
 447 
 448     // tracing
 449     if (TraceExceptions) {
 450       ttyLocker ttyl;
 451       ResourceMark rm(thread);
 452       tty->print_cr("Exception <%s> (" INTPTR_FORMAT ")", h_exception->print_value_string(), (address)h_exception());
 453       tty->print_cr(" thrown in interpreter method <%s>", h_method->print_value_string());
 454       tty->print_cr(" at bci %d for thread " INTPTR_FORMAT, current_bci, thread);
 455     }
 456 // Don't go paging in something which won't be used.
 457 //     else if (extable->length() == 0) {
 458 //       // disabled for now - interpreter is not using shortcut yet
 459 //       // (shortcut is not to call runtime if we have no exception handlers)
 460 //       // warning("performance bug: should not call runtime if method has no exception handlers");
 461 //     }
 462     // for AbortVMOnException flag
 463     NOT_PRODUCT(Exceptions::debug_check_abort(h_exception));
 464 
 465     // exception handler lookup
 466     KlassHandle h_klass(THREAD, h_exception->klass());
 467     handler_bci = Method::fast_exception_handler_bci_for(h_method, h_klass, current_bci, THREAD);
 468     if (HAS_PENDING_EXCEPTION) {
 469       // We threw an exception while trying to find the exception handler.
 470       // Transfer the new exception to the exception handle which will
 471       // be set into thread local storage, and do another lookup for an
 472       // exception handler for this exception, this time starting at the
 473       // BCI of the exception handler which caused the exception to be
 474       // thrown (bug 4307310).
 475       h_exception = Handle(THREAD, PENDING_EXCEPTION);
 476       CLEAR_PENDING_EXCEPTION;
 477       if (handler_bci >= 0) {
 478         current_bci = handler_bci;
 479         should_repeat = true;
 480       }
 481     }
 482   } while (should_repeat == true);
 483 
 484   // notify JVMTI of an exception throw; JVMTI will detect if this is a first
 485   // time throw or a stack unwinding throw and accordingly notify the debugger
 486   if (JvmtiExport::can_post_on_exceptions()) {
 487     JvmtiExport::post_exception_throw(thread, h_method(), bcp(thread), h_exception());
 488   }
 489 
 490 #ifdef CC_INTERP
 491   address continuation = (address)(intptr_t) handler_bci;
 492 #else
 493   address continuation = NULL;
 494 #endif
 495   address handler_pc = NULL;
 496   if (handler_bci < 0 || !thread->reguard_stack((address) &continuation)) {
 497     // Forward exception to callee (leaving bci/bcp untouched) because (a) no
 498     // handler in this method, or (b) after a stack overflow there is not yet
 499     // enough stack space available to reprotect the stack.
 500 #ifndef CC_INTERP
 501     continuation = Interpreter::remove_activation_entry();
 502 #endif
 503     // Count this for compilation purposes
 504     h_method->interpreter_throwout_increment(THREAD);
 505   } else {
 506     // handler in this method => change bci/bcp to handler bci/bcp and continue there
 507     handler_pc = h_method->code_base() + handler_bci;
 508 #ifndef CC_INTERP
 509     set_bcp_and_mdp(handler_pc, thread);
 510     continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
 511 #endif
 512   }
 513   // notify debugger of an exception catch
 514   // (this is good for exceptions caught in native methods as well)
 515   if (JvmtiExport::can_post_on_exceptions()) {
 516     JvmtiExport::notice_unwind_due_to_exception(thread, h_method(), handler_pc, h_exception(), (handler_pc != NULL));
 517   }
 518 
 519   thread->set_vm_result(h_exception());
 520   return continuation;
 521 IRT_END
 522 
 523 
 524 IRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* thread))
 525   assert(thread->has_pending_exception(), "must only ne called if there's an exception pending");
 526   // nothing to do - eventually we should remove this code entirely (see comments @ call sites)
 527 IRT_END
 528 
 529 
 530 IRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* thread))
 531   THROW(vmSymbols::java_lang_AbstractMethodError());
 532 IRT_END
 533 
 534 
 535 IRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))
 536   THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
 537 IRT_END
 538 
 539 
 540 //------------------------------------------------------------------------------------------------------------------------
 541 // Fields
 542 //
 543 
 544 IRT_ENTRY(void, InterpreterRuntime::resolve_get_put(JavaThread* thread, Bytecodes::Code bytecode))
 545   // resolve field
 546   fieldDescriptor info;
 547   constantPoolHandle pool(thread, method(thread)->constants());
 548   bool is_put    = (bytecode == Bytecodes::_putfield  || bytecode == Bytecodes::_putstatic);
 549   bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
 550 
 551   {
 552     JvmtiHideSingleStepping jhss(thread);
 553     LinkResolver::resolve_field_access(info, pool, get_index_u2_cpcache(thread, bytecode),
 554                                        bytecode, CHECK);
 555   } // end JvmtiHideSingleStepping
 556 
 557   // check if link resolution caused cpCache to be updated
 558   if (already_resolved(thread)) return;
 559 
 560   // compute auxiliary field attributes
 561   TosState state  = as_TosState(info.field_type());
 562 
 563   // We need to delay resolving put instructions on final fields
 564   // until we actually invoke one. This is required so we throw
 565   // exceptions at the correct place. If we do not resolve completely
 566   // in the current pass, leaving the put_code set to zero will
 567   // cause the next put instruction to reresolve.
 568   Bytecodes::Code put_code = (Bytecodes::Code)0;
 569 
 570   // We also need to delay resolving getstatic instructions until the
 571   // class is intitialized.  This is required so that access to the static
 572   // field will call the initialization function every time until the class
 573   // is completely initialized ala. in 2.17.5 in JVM Specification.
 574   InstanceKlass* klass = InstanceKlass::cast(info.field_holder());
 575   bool uninitialized_static = ((bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic) &&
 576                                !klass->is_initialized());
 577   Bytecodes::Code get_code = (Bytecodes::Code)0;
 578 
 579   if (!uninitialized_static) {
 580     get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield);
 581     if (is_put || !info.access_flags().is_final()) {
 582       put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
 583     }
 584   }
 585 
 586   cache_entry(thread)->set_field(
 587     get_code,
 588     put_code,
 589     info.field_holder(),
 590     info.index(),
 591     info.offset(),
 592     state,
 593     info.access_flags().is_final(),
 594     info.access_flags().is_volatile(),
 595     pool->pool_holder()
 596   );
 597 IRT_END
 598 
 599 
 600 //------------------------------------------------------------------------------------------------------------------------
 601 // Synchronization
 602 //
 603 // The interpreter's synchronization code is factored out so that it can
 604 // be shared by method invocation and synchronized blocks.
 605 //%note synchronization_3
 606 
 607 //%note monitor_1
 608 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* thread, BasicObjectLock* elem))
 609 #ifdef ASSERT
 610   thread->last_frame().interpreter_frame_verify_monitor(elem);
 611 #endif
 612   if (PrintBiasedLockingStatistics) {
 613     Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
 614   }
 615   Handle h_obj(thread, elem->obj());
 616   assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
 617          "must be NULL or an object");
 618   if (UseBiasedLocking) {
 619     // Retry fast entry if bias is revoked to avoid unnecessary inflation
 620     ObjectSynchronizer::fast_enter(h_obj, elem->lock(), true, CHECK);
 621   } else {
 622     ObjectSynchronizer::slow_enter(h_obj, elem->lock(), CHECK);
 623   }
 624   assert(Universe::heap()->is_in_reserved_or_null(elem->obj()),
 625          "must be NULL or an object");
 626 #ifdef ASSERT
 627   thread->last_frame().interpreter_frame_verify_monitor(elem);
 628 #endif
 629 IRT_END
 630 
 631 
 632 //%note monitor_1
 633 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorexit(JavaThread* thread, BasicObjectLock* elem))
 634 #ifdef ASSERT
 635   thread->last_frame().interpreter_frame_verify_monitor(elem);
 636 #endif
 637   Handle h_obj(thread, elem->obj());
 638   assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
 639          "must be NULL or an object");
 640   if (elem == NULL || h_obj()->is_unlocked()) {
 641     THROW(vmSymbols::java_lang_IllegalMonitorStateException());
 642   }
 643   ObjectSynchronizer::slow_exit(h_obj(), elem->lock(), thread);
 644   // Free entry. This must be done here, since a pending exception might be installed on
 645   // exit. If it is not cleared, the exception handling code will try to unlock the monitor again.
 646   elem->set_obj(NULL);
 647 #ifdef ASSERT
 648   thread->last_frame().interpreter_frame_verify_monitor(elem);
 649 #endif
 650 IRT_END
 651 
 652 
 653 IRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* thread))
 654   THROW(vmSymbols::java_lang_IllegalMonitorStateException());
 655 IRT_END
 656 
 657 
 658 IRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* thread))
 659   // Returns an illegal exception to install into the current thread. The
 660   // pending_exception flag is cleared so normal exception handling does not
 661   // trigger. Any current installed exception will be overwritten. This
 662   // method will be called during an exception unwind.
 663 
 664   assert(!HAS_PENDING_EXCEPTION, "no pending exception");
 665   Handle exception(thread, thread->vm_result());
 666   assert(exception() != NULL, "vm result should be set");
 667   thread->set_vm_result(NULL); // clear vm result before continuing (may cause memory leaks and assert failures)
 668   if (!exception->is_a(SystemDictionary::ThreadDeath_klass())) {
 669     exception = get_preinitialized_exception(
 670                        SystemDictionary::IllegalMonitorStateException_klass(),
 671                        CATCH);
 672   }
 673   thread->set_vm_result(exception());
 674 IRT_END
 675 
 676 
 677 //------------------------------------------------------------------------------------------------------------------------
 678 // Invokes
 679 
 680 IRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* thread, Method* method, address bcp))
 681   return method->orig_bytecode_at(method->bci_from(bcp));
 682 IRT_END
 683 
 684 IRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* thread, Method* method, address bcp, Bytecodes::Code new_code))
 685   method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
 686 IRT_END
 687 
 688 IRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* thread, Method* method, address bcp))
 689   JvmtiExport::post_raw_breakpoint(thread, method, bcp);
 690 IRT_END
 691 
 692 IRT_ENTRY(void, InterpreterRuntime::resolve_invoke(JavaThread* thread, Bytecodes::Code bytecode)) {
 693   // extract receiver from the outgoing argument list if necessary
 694   Handle receiver(thread, NULL);
 695   if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface ||
 696       bytecode == Bytecodes::_invokespecial) {
 697     ResourceMark rm(thread);
 698     methodHandle m (thread, method(thread));
 699     Bytecode_invoke call(m, bci(thread));
 700     Symbol* signature = call.signature();
 701     receiver = Handle(thread,
 702                   thread->last_frame().interpreter_callee_receiver(signature));
 703     assert(Universe::heap()->is_in_reserved_or_null(receiver()),
 704            "sanity check");
 705     assert(receiver.is_null() ||
 706            !Universe::heap()->is_in_reserved(receiver->klass()),
 707            "sanity check");
 708   }
 709 
 710   // resolve method
 711   CallInfo info;
 712   constantPoolHandle pool(thread, method(thread)->constants());
 713 
 714   {
 715     JvmtiHideSingleStepping jhss(thread);
 716     LinkResolver::resolve_invoke(info, receiver, pool,
 717                                  get_index_u2_cpcache(thread, bytecode), bytecode, CHECK);
 718     if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
 719       int retry_count = 0;
 720       while (info.resolved_method()->is_old()) {
 721         // It is very unlikely that method is redefined more than 100 times
 722         // in the middle of resolve. If it is looping here more than 100 times
 723         // means then there could be a bug here.
 724         guarantee((retry_count++ < 100),
 725                   "Could not resolve to latest version of redefined method");
 726         // method is redefined in the middle of resolve so re-try.
 727         LinkResolver::resolve_invoke(info, receiver, pool,
 728                                      get_index_u2_cpcache(thread, bytecode), bytecode, CHECK);
 729       }
 730     }
 731   } // end JvmtiHideSingleStepping
 732 
 733   // check if link resolution caused cpCache to be updated
 734   if (already_resolved(thread)) return;
 735 
 736   if (bytecode == Bytecodes::_invokeinterface) {
 737     if (TraceItables && Verbose) {
 738       ResourceMark rm(thread);
 739       tty->print_cr("Resolving: klass: %s to method: %s", info.resolved_klass()->name()->as_C_string(), info.resolved_method()->name()->as_C_string());
 740     }
 741   }
 742 #ifdef ASSERT
 743   if (bytecode == Bytecodes::_invokeinterface) {
 744     if (info.resolved_method()->method_holder() ==
 745                                             SystemDictionary::Object_klass()) {
 746       // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
 747       // (see also CallInfo::set_interface for details)
 748       assert(info.call_kind() == CallInfo::vtable_call ||
 749              info.call_kind() == CallInfo::direct_call, "");
 750       methodHandle rm = info.resolved_method();
 751       assert(rm->is_final() || info.has_vtable_index(),
 752              "should have been set already");
 753     } else if (!info.resolved_method()->has_itable_index()) {
 754       // Resolved something like CharSequence.toString.  Use vtable not itable.
 755       assert(info.call_kind() != CallInfo::itable_call, "");
 756     } else {
 757       // Setup itable entry
 758       assert(info.call_kind() == CallInfo::itable_call, "");
 759       int index = info.resolved_method()->itable_index();
 760       assert(info.itable_index() == index, "");
 761     }
 762   } else if (bytecode == Bytecodes::_invokespecial) {
 763     assert(info.call_kind() == CallInfo::direct_call, "must be direct call");
 764   } else {
 765     assert(info.call_kind() == CallInfo::direct_call ||
 766            info.call_kind() == CallInfo::vtable_call, "");
 767   }
 768 #endif
 769   // Get sender or sender's host_klass, and only set cpCache entry to resolved if
 770   // it is not an interface.  The receiver for invokespecial calls within interface
 771   // methods must be checked for every call.
 772   InstanceKlass* sender = pool->pool_holder();
 773   sender = sender->is_anonymous() ? InstanceKlass::cast(sender->host_klass()) : sender;
 774 
 775   switch (info.call_kind()) {
 776   case CallInfo::direct_call:
 777     cache_entry(thread)->set_direct_call(
 778       bytecode,
 779       info.resolved_method(),
 780       sender->is_interface());
 781     break;
 782   case CallInfo::vtable_call:
 783     cache_entry(thread)->set_vtable_call(
 784       bytecode,
 785       info.resolved_method(),
 786       info.vtable_index());
 787     break;
 788   case CallInfo::itable_call:
 789     cache_entry(thread)->set_itable_call(
 790       bytecode,
 791       info.resolved_method(),
 792       info.itable_index());
 793     break;
 794   default:  ShouldNotReachHere();
 795   }
 796 }
 797 IRT_END
 798 
 799 
 800 // First time execution:  Resolve symbols, create a permanent MethodType object.
 801 IRT_ENTRY(void, InterpreterRuntime::resolve_invokehandle(JavaThread* thread)) {
 802   assert(EnableInvokeDynamic, "");
 803   const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
 804 
 805   // resolve method
 806   CallInfo info;
 807   constantPoolHandle pool(thread, method(thread)->constants());
 808 
 809   {
 810     JvmtiHideSingleStepping jhss(thread);
 811     LinkResolver::resolve_invoke(info, Handle(), pool,
 812                                  get_index_u2_cpcache(thread, bytecode), bytecode, CHECK);
 813   } // end JvmtiHideSingleStepping
 814 
 815   cache_entry(thread)->set_method_handle(pool, info);
 816 }
 817 IRT_END
 818 
 819 
 820 // First time execution:  Resolve symbols, create a permanent CallSite object.
 821 IRT_ENTRY(void, InterpreterRuntime::resolve_invokedynamic(JavaThread* thread)) {
 822   assert(EnableInvokeDynamic, "");
 823   const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
 824 
 825   //TO DO: consider passing BCI to Java.
 826   //  int caller_bci = method(thread)->bci_from(bcp(thread));
 827 
 828   // resolve method
 829   CallInfo info;
 830   constantPoolHandle pool(thread, method(thread)->constants());
 831   int index = get_index_u4(thread, bytecode);
 832   {
 833     JvmtiHideSingleStepping jhss(thread);
 834     LinkResolver::resolve_invoke(info, Handle(), pool,
 835                                  index, bytecode, CHECK);
 836   } // end JvmtiHideSingleStepping
 837 
 838   ConstantPoolCacheEntry* cp_cache_entry = pool->invokedynamic_cp_cache_entry_at(index);
 839   cp_cache_entry->set_dynamic_call(pool, info);
 840 }
 841 IRT_END
 842 
 843 
 844 //------------------------------------------------------------------------------------------------------------------------
 845 // Miscellaneous
 846 
 847 
 848 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* thread, address branch_bcp) {
 849   nmethod* nm = frequency_counter_overflow_inner(thread, branch_bcp);
 850   assert(branch_bcp != NULL || nm == NULL, "always returns null for non OSR requests");
 851   if (branch_bcp != NULL && nm != NULL) {
 852     // This was a successful request for an OSR nmethod.  Because
 853     // frequency_counter_overflow_inner ends with a safepoint check,
 854     // nm could have been unloaded so look it up again.  It's unsafe
 855     // to examine nm directly since it might have been freed and used
 856     // for something else.
 857     frame fr = thread->last_frame();
 858     Method* method =  fr.interpreter_frame_method();
 859     int bci = method->bci_from(fr.interpreter_frame_bcp());
 860     nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
 861   }
 862 #ifndef PRODUCT
 863   if (TraceOnStackReplacement) {
 864     if (nm != NULL) {
 865       tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", nm->osr_entry());
 866       nm->print();
 867     }
 868   }
 869 #endif
 870   return nm;
 871 }
 872 
 873 IRT_ENTRY(nmethod*,
 874           InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* thread, address branch_bcp))
 875   // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
 876   // flag, in case this method triggers classloading which will call into Java.
 877   UnlockFlagSaver fs(thread);
 878 
 879   frame fr = thread->last_frame();
 880   assert(fr.is_interpreted_frame(), "must come from interpreter");
 881   methodHandle method(thread, fr.interpreter_frame_method());
 882   const int branch_bci = branch_bcp != NULL ? method->bci_from(branch_bcp) : InvocationEntryBci;
 883   const int bci = branch_bcp != NULL ? method->bci_from(fr.interpreter_frame_bcp()) : InvocationEntryBci;
 884 
 885   assert(!HAS_PENDING_EXCEPTION, "Should not have any exceptions pending");
 886   nmethod* osr_nm = CompilationPolicy::policy()->event(method, method, branch_bci, bci, CompLevel_none, NULL, thread);
 887   assert(!HAS_PENDING_EXCEPTION, "Event handler should not throw any exceptions");
 888 
 889   if (osr_nm != NULL) {
 890     // We may need to do on-stack replacement which requires that no
 891     // monitors in the activation are biased because their
 892     // BasicObjectLocks will need to migrate during OSR. Force
 893     // unbiasing of all monitors in the activation now (even though
 894     // the OSR nmethod might be invalidated) because we don't have a
 895     // safepoint opportunity later once the migration begins.
 896     if (UseBiasedLocking) {
 897       ResourceMark rm;
 898       GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>();
 899       for( BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
 900            kptr < fr.interpreter_frame_monitor_begin();
 901            kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
 902         if( kptr->obj() != NULL ) {
 903           objects_to_revoke->append(Handle(THREAD, kptr->obj()));
 904         }
 905       }
 906       BiasedLocking::revoke(objects_to_revoke);
 907     }
 908   }
 909   return osr_nm;
 910 IRT_END
 911 
 912 IRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp))
 913   assert(ProfileInterpreter, "must be profiling interpreter");
 914   int bci = method->bci_from(cur_bcp);
 915   MethodData* mdo = method->method_data();
 916   if (mdo == NULL)  return 0;
 917   return mdo->bci_to_di(bci);
 918 IRT_END
 919 
 920 IRT_ENTRY(void, InterpreterRuntime::profile_method(JavaThread* thread))
 921   // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
 922   // flag, in case this method triggers classloading which will call into Java.
 923   UnlockFlagSaver fs(thread);
 924 
 925   assert(ProfileInterpreter, "must be profiling interpreter");
 926   frame fr = thread->last_frame();
 927   assert(fr.is_interpreted_frame(), "must come from interpreter");
 928   methodHandle method(thread, fr.interpreter_frame_method());
 929   Method::build_interpreter_method_data(method, THREAD);
 930   if (HAS_PENDING_EXCEPTION) {
 931     assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
 932     CLEAR_PENDING_EXCEPTION;
 933     // and fall through...
 934   }
 935 IRT_END
 936 
 937 
 938 #ifdef ASSERT
 939 IRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp))
 940   assert(ProfileInterpreter, "must be profiling interpreter");
 941 
 942   MethodData* mdo = method->method_data();
 943   assert(mdo != NULL, "must not be null");
 944 
 945   int bci = method->bci_from(bcp);
 946 
 947   address mdp2 = mdo->bci_to_dp(bci);
 948   if (mdp != mdp2) {
 949     ResourceMark rm;
 950     ResetNoHandleMark rnm; // In a LEAF entry.
 951     HandleMark hm;
 952     tty->print_cr("FAILED verify : actual mdp %p   expected mdp %p @ bci %d", mdp, mdp2, bci);
 953     int current_di = mdo->dp_to_di(mdp);
 954     int expected_di  = mdo->dp_to_di(mdp2);
 955     tty->print_cr("  actual di %d   expected di %d", current_di, expected_di);
 956     int expected_approx_bci = mdo->data_at(expected_di)->bci();
 957     int approx_bci = -1;
 958     if (current_di >= 0) {
 959       approx_bci = mdo->data_at(current_di)->bci();
 960     }
 961     tty->print_cr("  actual bci is %d  expected bci %d", approx_bci, expected_approx_bci);
 962     mdo->print_on(tty);
 963     method->print_codes();
 964   }
 965   assert(mdp == mdp2, "wrong mdp");
 966 IRT_END
 967 #endif // ASSERT
 968 
 969 IRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* thread, int return_bci))
 970   assert(ProfileInterpreter, "must be profiling interpreter");
 971   ResourceMark rm(thread);
 972   HandleMark hm(thread);
 973   frame fr = thread->last_frame();
 974   assert(fr.is_interpreted_frame(), "must come from interpreter");
 975   MethodData* h_mdo = fr.interpreter_frame_method()->method_data();
 976 
 977   // Grab a lock to ensure atomic access to setting the return bci and
 978   // the displacement.  This can block and GC, invalidating all naked oops.
 979   MutexLocker ml(RetData_lock);
 980 
 981   // ProfileData is essentially a wrapper around a derived oop, so we
 982   // need to take the lock before making any ProfileData structures.
 983   ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(fr.interpreter_frame_mdp()));
 984   guarantee(data != NULL, "profile data must be valid");
 985   RetData* rdata = data->as_RetData();
 986   address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
 987   fr.interpreter_frame_set_mdp(new_mdp);
 988 IRT_END
 989 
 990 IRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* thread, Method* m))
 991   MethodCounters* mcs = Method::build_method_counters(m, thread);
 992   if (HAS_PENDING_EXCEPTION) {
 993     assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
 994     CLEAR_PENDING_EXCEPTION;
 995   }
 996   return mcs;
 997 IRT_END
 998 
 999 
1000 IRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* thread))
1001   // We used to need an explict preserve_arguments here for invoke bytecodes. However,
1002   // stack traversal automatically takes care of preserving arguments for invoke, so
1003   // this is no longer needed.
1004 
1005   // IRT_END does an implicit safepoint check, hence we are guaranteed to block
1006   // if this is called during a safepoint
1007 
1008   if (JvmtiExport::should_post_single_step()) {
1009     // We are called during regular safepoints and when the VM is
1010     // single stepping. If any thread is marked for single stepping,
1011     // then we may have JVMTI work to do.
1012     JvmtiExport::at_single_stepping_point(thread, method(thread), bcp(thread));
1013   }
1014 IRT_END
1015 
1016 IRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread *thread, oopDesc* obj,
1017 ConstantPoolCacheEntry *cp_entry))
1018 
1019   // check the access_flags for the field in the klass
1020 
1021   InstanceKlass* ik = InstanceKlass::cast(cp_entry->f1_as_klass());
1022   int index = cp_entry->field_index();
1023   if ((ik->field_access_flags(index) & JVM_ACC_FIELD_ACCESS_WATCHED) == 0) return;
1024 
1025   switch(cp_entry->flag_state()) {
1026     case btos:    // fall through
1027     case ztos:    // fall through
1028     case ctos:    // fall through
1029     case stos:    // fall through
1030     case itos:    // fall through
1031     case ftos:    // fall through
1032     case ltos:    // fall through
1033     case dtos:    // fall through
1034     case atos: break;
1035     default: ShouldNotReachHere(); return;
1036   }
1037   bool is_static = (obj == NULL);
1038   HandleMark hm(thread);
1039 
1040   Handle h_obj;
1041   if (!is_static) {
1042     // non-static field accessors have an object, but we need a handle
1043     h_obj = Handle(thread, obj);
1044   }
1045   instanceKlassHandle h_cp_entry_f1(thread, (Klass*)cp_entry->f1_as_klass());
1046   jfieldID fid = jfieldIDWorkaround::to_jfieldID(h_cp_entry_f1, cp_entry->f2_as_index(), is_static);
1047   JvmtiExport::post_field_access(thread, method(thread), bcp(thread), h_cp_entry_f1, h_obj, fid);
1048 IRT_END
1049 
1050 IRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread *thread,
1051   oopDesc* obj, ConstantPoolCacheEntry *cp_entry, jvalue *value))
1052 
1053   Klass* k = (Klass*)cp_entry->f1_as_klass();
1054 
1055   // check the access_flags for the field in the klass
1056   InstanceKlass* ik = InstanceKlass::cast(k);
1057   int index = cp_entry->field_index();
1058   // bail out if field modifications are not watched
1059   if ((ik->field_access_flags(index) & JVM_ACC_FIELD_MODIFICATION_WATCHED) == 0) return;
1060 
1061   char sig_type = '\0';
1062 
1063   switch(cp_entry->flag_state()) {
1064     case btos: sig_type = 'B'; break;
1065     case ztos: sig_type = 'Z'; break;
1066     case ctos: sig_type = 'C'; break;
1067     case stos: sig_type = 'S'; break;
1068     case itos: sig_type = 'I'; break;
1069     case ftos: sig_type = 'F'; break;
1070     case atos: sig_type = 'L'; break;
1071     case ltos: sig_type = 'J'; break;
1072     case dtos: sig_type = 'D'; break;
1073     default:  ShouldNotReachHere(); return;
1074   }
1075   bool is_static = (obj == NULL);
1076 
1077   HandleMark hm(thread);
1078   instanceKlassHandle h_klass(thread, k);
1079   jfieldID fid = jfieldIDWorkaround::to_jfieldID(h_klass, cp_entry->f2_as_index(), is_static);
1080   jvalue fvalue;
1081 #ifdef _LP64
1082   fvalue = *value;
1083 #else
1084   // Long/double values are stored unaligned and also noncontiguously with
1085   // tagged stacks.  We can't just do a simple assignment even in the non-
1086   // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1087   // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1088   // We assume that the two halves of longs/doubles are stored in interpreter
1089   // stack slots in platform-endian order.
1090   jlong_accessor u;
1091   jint* newval = (jint*)value;
1092   u.words[0] = newval[0];
1093   u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1094   fvalue.j = u.long_value;
1095 #endif // _LP64
1096 
1097   Handle h_obj;
1098   if (!is_static) {
1099     // non-static field accessors have an object, but we need a handle
1100     h_obj = Handle(thread, obj);
1101   }
1102 
1103   JvmtiExport::post_raw_field_modification(thread, method(thread), bcp(thread), h_klass, h_obj,
1104                                            fid, sig_type, &fvalue);
1105 IRT_END
1106 
1107 IRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread *thread))
1108   JvmtiExport::post_method_entry(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread));
1109 IRT_END
1110 
1111 
1112 IRT_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread *thread))
1113   JvmtiExport::post_method_exit(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread));
1114 IRT_END
1115 
1116 IRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1117 {
1118   return (Interpreter::contains(pc) ? 1 : 0);
1119 }
1120 IRT_END
1121 
1122 
1123 // Implementation of SignatureHandlerLibrary
1124 
1125 address SignatureHandlerLibrary::set_handler_blob() {
1126   BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1127   if (handler_blob == NULL) {
1128     return NULL;
1129   }
1130   address handler = handler_blob->code_begin();
1131   _handler_blob = handler_blob;
1132   _handler = handler;
1133   return handler;
1134 }
1135 
1136 void SignatureHandlerLibrary::initialize() {
1137   if (_fingerprints != NULL) {
1138     return;
1139   }
1140   if (set_handler_blob() == NULL) {
1141     vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers");
1142   }
1143 
1144   BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1145                                       SignatureHandlerLibrary::buffer_size);
1146   _buffer = bb->code_begin();
1147 
1148   _fingerprints = new(ResourceObj::C_HEAP, mtCode)GrowableArray<uint64_t>(32, true);
1149   _handlers     = new(ResourceObj::C_HEAP, mtCode)GrowableArray<address>(32, true);
1150 }
1151 
1152 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1153   address handler   = _handler;
1154   int     insts_size = buffer->pure_insts_size();
1155   if (handler + insts_size > _handler_blob->code_end()) {
1156     // get a new handler blob
1157     handler = set_handler_blob();
1158   }
1159   if (handler != NULL) {
1160     memcpy(handler, buffer->insts_begin(), insts_size);
1161     pd_set_handler(handler);
1162     ICache::invalidate_range(handler, insts_size);
1163     _handler = handler + insts_size;
1164   }
1165   return handler;
1166 }
1167 
1168 void SignatureHandlerLibrary::add(methodHandle method) {
1169   if (method->signature_handler() == NULL) {
1170     // use slow signature handler if we can't do better
1171     int handler_index = -1;
1172     // check if we can use customized (fast) signature handler
1173     if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::max_size_of_parameters) {
1174       // use customized signature handler
1175       MutexLocker mu(SignatureHandlerLibrary_lock);
1176       // make sure data structure is initialized
1177       initialize();
1178       // lookup method signature's fingerprint
1179       uint64_t fingerprint = Fingerprinter(method).fingerprint();
1180       handler_index = _fingerprints->find(fingerprint);
1181       // create handler if necessary
1182       if (handler_index < 0) {
1183         ResourceMark rm;
1184         ptrdiff_t align_offset = (address)
1185           round_to((intptr_t)_buffer, CodeEntryAlignment) - (address)_buffer;
1186         CodeBuffer buffer((address)(_buffer + align_offset),
1187                           SignatureHandlerLibrary::buffer_size - align_offset);
1188         InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1189         // copy into code heap
1190         address handler = set_handler(&buffer);
1191         if (handler == NULL) {
1192           // use slow signature handler
1193         } else {
1194           // debugging suppport
1195           if (PrintSignatureHandlers) {
1196             tty->cr();
1197             tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1198                           _handlers->length(),
1199                           (method->is_static() ? "static" : "receiver"),
1200                           method->name_and_sig_as_C_string(),
1201                           fingerprint,
1202                           buffer.insts_size());
1203             Disassembler::decode(handler, handler + buffer.insts_size());
1204 #ifndef PRODUCT
1205             tty->print_cr(" --- associated result handler ---");
1206             address rh_begin = Interpreter::result_handler(method()->result_type());
1207             address rh_end = rh_begin;
1208             while (*(int*)rh_end != 0) {
1209               rh_end += sizeof(int);
1210             }
1211             Disassembler::decode(rh_begin, rh_end);
1212 #endif
1213           }
1214           // add handler to library
1215           _fingerprints->append(fingerprint);
1216           _handlers->append(handler);
1217           // set handler index
1218           assert(_fingerprints->length() == _handlers->length(), "sanity check");
1219           handler_index = _fingerprints->length() - 1;
1220         }
1221       }
1222       // Set handler under SignatureHandlerLibrary_lock
1223     if (handler_index < 0) {
1224       // use generic signature handler
1225       method->set_signature_handler(Interpreter::slow_signature_handler());
1226     } else {
1227       // set handler
1228       method->set_signature_handler(_handlers->at(handler_index));
1229     }
1230     } else {
1231       CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
1232       // use generic signature handler
1233       method->set_signature_handler(Interpreter::slow_signature_handler());
1234     }
1235   }
1236 #ifdef ASSERT
1237   int handler_index = -1;
1238   int fingerprint_index = -2;
1239   {
1240     // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized
1241     // in any way if accessed from multiple threads. To avoid races with another
1242     // thread which may change the arrays in the above, mutex protected block, we
1243     // have to protect this read access here with the same mutex as well!
1244     MutexLocker mu(SignatureHandlerLibrary_lock);
1245     if (_handlers != NULL) {
1246     handler_index = _handlers->find(method->signature_handler());
1247     fingerprint_index = _fingerprints->find(Fingerprinter(method).fingerprint());
1248   }
1249   }
1250   assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1251          handler_index == fingerprint_index, "sanity check");
1252 #endif // ASSERT
1253 }
1254 
1255 
1256 BufferBlob*              SignatureHandlerLibrary::_handler_blob = NULL;
1257 address                  SignatureHandlerLibrary::_handler      = NULL;
1258 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = NULL;
1259 GrowableArray<address>*  SignatureHandlerLibrary::_handlers     = NULL;
1260 address                  SignatureHandlerLibrary::_buffer       = NULL;
1261 
1262 
1263 IRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* thread, Method* method))
1264   methodHandle m(thread, method);
1265   assert(m->is_native(), "sanity check");
1266   // lookup native function entry point if it doesn't exist
1267   bool in_base_library;
1268   if (!m->has_native_function()) {
1269     NativeLookup::lookup(m, in_base_library, CHECK);
1270   }
1271   // make sure signature handler is installed
1272   SignatureHandlerLibrary::add(m);
1273   // The interpreter entry point checks the signature handler first,
1274   // before trying to fetch the native entry point and klass mirror.
1275   // We must set the signature handler last, so that multiple processors
1276   // preparing the same method will be sure to see non-null entry & mirror.
1277 IRT_END
1278 
1279 #if defined(IA32) || defined(AMD64) || defined(ARM)
1280 IRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* thread, void* src_address, void* dest_address))
1281   if (src_address == dest_address) {
1282     return;
1283   }
1284   ResetNoHandleMark rnm; // In a LEAF entry.
1285   HandleMark hm;
1286   ResourceMark rm;
1287   frame fr = thread->last_frame();
1288   assert(fr.is_interpreted_frame(), "");
1289   jint bci = fr.interpreter_frame_bci();
1290   methodHandle mh(thread, fr.interpreter_frame_method());
1291   Bytecode_invoke invoke(mh, bci);
1292   ArgumentSizeComputer asc(invoke.signature());
1293   int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver
1294   Copy::conjoint_jbytes(src_address, dest_address,
1295                        size_of_arguments * Interpreter::stackElementSize);
1296 IRT_END
1297 #endif
1298 
1299 #if INCLUDE_JVMTI
1300 // This is a support of the JVMTI PopFrame interface.
1301 // Make sure it is an invokestatic of a polymorphic intrinsic that has a member_name argument
1302 // and return it as a vm_result so that it can be reloaded in the list of invokestatic parameters.
1303 // The member_name argument is a saved reference (in local#0) to the member_name.
1304 // For backward compatibility with some JDK versions (7, 8) it can also be a direct method handle.
1305 // FIXME: remove DMH case after j.l.i.InvokerBytecodeGenerator code shape is updated.
1306 IRT_ENTRY(void, InterpreterRuntime::member_name_arg_or_null(JavaThread* thread, address member_name,
1307                                                             Method* method, address bcp))
1308   Bytecodes::Code code = Bytecodes::code_at(method, bcp);
1309   if (code != Bytecodes::_invokestatic) {
1310     return;
1311   }
1312   ConstantPool* cpool = method->constants();
1313   int cp_index = Bytes::get_native_u2(bcp + 1) + ConstantPool::CPCACHE_INDEX_TAG;
1314   Symbol* cname = cpool->klass_name_at(cpool->klass_ref_index_at(cp_index));
1315   Symbol* mname = cpool->name_ref_at(cp_index);
1316 
1317   if (MethodHandles::has_member_arg(cname, mname)) {
1318     oop member_name_oop = (oop) member_name;
1319     if (java_lang_invoke_DirectMethodHandle::is_instance(member_name_oop)) {
1320       // FIXME: remove after j.l.i.InvokerBytecodeGenerator code shape is updated.
1321       member_name_oop = java_lang_invoke_DirectMethodHandle::member(member_name_oop);
1322     }
1323     thread->set_vm_result(member_name_oop);
1324   } else {
1325     thread->set_vm_result(NULL);
1326   }
1327 IRT_END
1328 #endif // INCLUDE_JVMTI