1 /*
   2  * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/javaClasses.inline.hpp"
  27 #include "classfile/systemDictionary.hpp"
  28 #include "classfile/vmSymbols.hpp"
  29 #include "code/codeCache.hpp"
  30 #include "compiler/compileBroker.hpp"
  31 #include "compiler/disassembler.hpp"
  32 #include "gc/shared/collectedHeap.hpp"
  33 #include "interpreter/interpreter.hpp"
  34 #include "interpreter/interpreterRuntime.hpp"
  35 #include "interpreter/linkResolver.hpp"
  36 #include "interpreter/templateTable.hpp"
  37 #include "logging/log.hpp"
  38 #include "memory/oopFactory.hpp"
  39 #include "memory/resourceArea.hpp"
  40 #include "memory/universe.inline.hpp"
  41 #include "oops/constantPool.hpp"
  42 #include "oops/instanceKlass.hpp"
  43 #include "oops/methodData.hpp"
  44 #include "oops/objArrayKlass.hpp"
  45 #include "oops/objArrayOop.inline.hpp"
  46 #include "oops/oop.inline.hpp"
  47 #include "oops/symbol.hpp"
  48 #include "prims/jvmtiExport.hpp"
  49 #include "prims/nativeLookup.hpp"
  50 #include "runtime/atomic.hpp"
  51 #include "runtime/biasedLocking.hpp"
  52 #include "runtime/compilationPolicy.hpp"
  53 #include "runtime/deoptimization.hpp"
  54 #include "runtime/fieldDescriptor.hpp"
  55 #include "runtime/handles.inline.hpp"
  56 #include "runtime/icache.hpp"
  57 #include "runtime/interfaceSupport.hpp"
  58 #include "runtime/java.hpp"
  59 #include "runtime/jfieldIDWorkaround.hpp"
  60 #include "runtime/osThread.hpp"
  61 #include "runtime/sharedRuntime.hpp"
  62 #include "runtime/stubRoutines.hpp"
  63 #include "runtime/synchronizer.hpp"
  64 #include "runtime/threadCritical.hpp"
  65 #include "utilities/align.hpp"
  66 #include "utilities/events.hpp"
  67 #ifdef COMPILER2
  68 #include "opto/runtime.hpp"
  69 #endif
  70 
  71 class UnlockFlagSaver {
  72   private:
  73     JavaThread* _thread;
  74     bool _do_not_unlock;
  75   public:
  76     UnlockFlagSaver(JavaThread* t) {
  77       _thread = t;
  78       _do_not_unlock = t->do_not_unlock_if_synchronized();
  79       t->set_do_not_unlock_if_synchronized(false);
  80     }
  81     ~UnlockFlagSaver() {
  82       _thread->set_do_not_unlock_if_synchronized(_do_not_unlock);
  83     }
  84 };
  85 
  86 //------------------------------------------------------------------------------------------------------------------------
  87 // State accessors
  88 
  89 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread *thread) {
  90   last_frame(thread).interpreter_frame_set_bcp(bcp);
  91   if (ProfileInterpreter) {
  92     // ProfileTraps uses MDOs independently of ProfileInterpreter.
  93     // That is why we must check both ProfileInterpreter and mdo != NULL.
  94     MethodData* mdo = last_frame(thread).interpreter_frame_method()->method_data();
  95     if (mdo != NULL) {
  96       NEEDS_CLEANUP;
  97       last_frame(thread).interpreter_frame_set_mdp(mdo->bci_to_dp(last_frame(thread).interpreter_frame_bci()));
  98     }
  99   }
 100 }
 101 
 102 //------------------------------------------------------------------------------------------------------------------------
 103 // Constants
 104 
 105 
 106 IRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* thread, bool wide))
 107   // access constant pool
 108   ConstantPool* pool = method(thread)->constants();
 109   int index = wide ? get_index_u2(thread, Bytecodes::_ldc_w) : get_index_u1(thread, Bytecodes::_ldc);
 110   constantTag tag = pool->tag_at(index);
 111 
 112   assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call");
 113   Klass* klass = pool->klass_at(index, CHECK);
 114     oop java_class = klass->java_mirror();
 115     thread->set_vm_result(java_class);
 116 IRT_END
 117 
 118 IRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* thread, Bytecodes::Code bytecode)) {
 119   assert(bytecode == Bytecodes::_fast_aldc ||
 120          bytecode == Bytecodes::_fast_aldc_w, "wrong bc");
 121   ResourceMark rm(thread);
 122   methodHandle m (thread, method(thread));
 123   Bytecode_loadconstant ldc(m, bci(thread));
 124   oop result = ldc.resolve_constant(CHECK);
 125 #ifdef ASSERT
 126   {
 127     // The bytecode wrappers aren't GC-safe so construct a new one
 128     Bytecode_loadconstant ldc2(m, bci(thread));
 129     oop coop = m->constants()->resolved_references()->obj_at(ldc2.cache_index());
 130     assert(result == coop, "expected result for assembly code");
 131   }
 132 #endif
 133   thread->set_vm_result(result);
 134 }
 135 IRT_END
 136 
 137 
 138 //------------------------------------------------------------------------------------------------------------------------
 139 // Allocation
 140 
 141 IRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* thread, ConstantPool* pool, int index))
 142   Klass* k = pool->klass_at(index, CHECK);
 143   InstanceKlass* klass = InstanceKlass::cast(k);
 144 
 145   // Make sure we are not instantiating an abstract klass
 146   klass->check_valid_for_instantiation(true, CHECK);
 147 
 148   // Make sure klass is initialized
 149   klass->initialize(CHECK);
 150 
 151   // At this point the class may not be fully initialized
 152   // because of recursive initialization. If it is fully
 153   // initialized & has_finalized is not set, we rewrite
 154   // it into its fast version (Note: no locking is needed
 155   // here since this is an atomic byte write and can be
 156   // done more than once).
 157   //
 158   // Note: In case of classes with has_finalized we don't
 159   //       rewrite since that saves us an extra check in
 160   //       the fast version which then would call the
 161   //       slow version anyway (and do a call back into
 162   //       Java).
 163   //       If we have a breakpoint, then we don't rewrite
 164   //       because the _breakpoint bytecode would be lost.
 165   oop obj = klass->allocate_instance(CHECK);
 166   thread->set_vm_result(obj);
 167 IRT_END
 168 
 169 
 170 IRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* thread, BasicType type, jint size))
 171   oop obj = oopFactory::new_typeArray(type, size, CHECK);
 172   thread->set_vm_result(obj);
 173 IRT_END
 174 
 175 
 176 IRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* thread, ConstantPool* pool, int index, jint size))
 177   Klass*    klass = pool->klass_at(index, CHECK);
 178   objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
 179   thread->set_vm_result(obj);
 180 IRT_END
 181 
 182 
 183 IRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* thread, jint* first_size_address))
 184   // We may want to pass in more arguments - could make this slightly faster
 185   ConstantPool* constants = method(thread)->constants();
 186   int          i = get_index_u2(thread, Bytecodes::_multianewarray);
 187   Klass* klass = constants->klass_at(i, CHECK);
 188   int   nof_dims = number_of_dimensions(thread);
 189   assert(klass->is_klass(), "not a class");
 190   assert(nof_dims >= 1, "multianewarray rank must be nonzero");
 191 
 192   // We must create an array of jints to pass to multi_allocate.
 193   ResourceMark rm(thread);
 194   const int small_dims = 10;
 195   jint dim_array[small_dims];
 196   jint *dims = &dim_array[0];
 197   if (nof_dims > small_dims) {
 198     dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
 199   }
 200   for (int index = 0; index < nof_dims; index++) {
 201     // offset from first_size_address is addressed as local[index]
 202     int n = Interpreter::local_offset_in_bytes(index)/jintSize;
 203     dims[index] = first_size_address[n];
 204   }
 205   oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
 206   thread->set_vm_result(obj);
 207 IRT_END
 208 
 209 
 210 IRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))
 211   assert(oopDesc::is_oop(obj), "must be a valid oop");
 212   assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
 213   InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
 214 IRT_END
 215 
 216 
 217 // Quicken instance-of and check-cast bytecodes
 218 IRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* thread))
 219   // Force resolving; quicken the bytecode
 220   int which = get_index_u2(thread, Bytecodes::_checkcast);
 221   ConstantPool* cpool = method(thread)->constants();
 222   // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
 223   // program we might have seen an unquick'd bytecode in the interpreter but have another
 224   // thread quicken the bytecode before we get here.
 225   // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
 226   Klass* klass = cpool->klass_at(which, CHECK);
 227   thread->set_vm_result_2(klass);
 228 IRT_END
 229 
 230 
 231 //------------------------------------------------------------------------------------------------------------------------
 232 // Exceptions
 233 
 234 void InterpreterRuntime::note_trap_inner(JavaThread* thread, int reason,
 235                                          const methodHandle& trap_method, int trap_bci, TRAPS) {
 236   if (trap_method.not_null()) {
 237     MethodData* trap_mdo = trap_method->method_data();
 238     if (trap_mdo == NULL) {
 239       Method::build_interpreter_method_data(trap_method, THREAD);
 240       if (HAS_PENDING_EXCEPTION) {
 241         assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())),
 242                "we expect only an OOM error here");
 243         CLEAR_PENDING_EXCEPTION;
 244       }
 245       trap_mdo = trap_method->method_data();
 246       // and fall through...
 247     }
 248     if (trap_mdo != NULL) {
 249       // Update per-method count of trap events.  The interpreter
 250       // is updating the MDO to simulate the effect of compiler traps.
 251       Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
 252     }
 253   }
 254 }
 255 
 256 // Assume the compiler is (or will be) interested in this event.
 257 // If necessary, create an MDO to hold the information, and record it.
 258 void InterpreterRuntime::note_trap(JavaThread* thread, int reason, TRAPS) {
 259   assert(ProfileTraps, "call me only if profiling");
 260   methodHandle trap_method(thread, method(thread));
 261   int trap_bci = trap_method->bci_from(bcp(thread));
 262   note_trap_inner(thread, reason, trap_method, trap_bci, THREAD);
 263 }
 264 
 265 #ifdef CC_INTERP
 266 // As legacy note_trap, but we have more arguments.
 267 IRT_ENTRY(void, InterpreterRuntime::note_trap(JavaThread* thread, int reason, Method *method, int trap_bci))
 268   methodHandle trap_method(method);
 269   note_trap_inner(thread, reason, trap_method, trap_bci, THREAD);
 270 IRT_END
 271 
 272 // Class Deoptimization is not visible in BytecodeInterpreter, so we need a wrapper
 273 // for each exception.
 274 void InterpreterRuntime::note_nullCheck_trap(JavaThread* thread, Method *method, int trap_bci)
 275   { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_null_check, method, trap_bci); }
 276 void InterpreterRuntime::note_div0Check_trap(JavaThread* thread, Method *method, int trap_bci)
 277   { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_div0_check, method, trap_bci); }
 278 void InterpreterRuntime::note_rangeCheck_trap(JavaThread* thread, Method *method, int trap_bci)
 279   { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_range_check, method, trap_bci); }
 280 void InterpreterRuntime::note_classCheck_trap(JavaThread* thread, Method *method, int trap_bci)
 281   { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_class_check, method, trap_bci); }
 282 void InterpreterRuntime::note_arrayCheck_trap(JavaThread* thread, Method *method, int trap_bci)
 283   { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_array_check, method, trap_bci); }
 284 #endif // CC_INTERP
 285 
 286 
 287 static Handle get_preinitialized_exception(Klass* k, TRAPS) {
 288   // get klass
 289   InstanceKlass* klass = InstanceKlass::cast(k);
 290   assert(klass->is_initialized(),
 291          "this klass should have been initialized during VM initialization");
 292   // create instance - do not call constructor since we may have no
 293   // (java) stack space left (should assert constructor is empty)
 294   Handle exception;
 295   oop exception_oop = klass->allocate_instance(CHECK_(exception));
 296   exception = Handle(THREAD, exception_oop);
 297   if (StackTraceInThrowable) {
 298     java_lang_Throwable::fill_in_stack_trace(exception);
 299   }
 300   return exception;
 301 }
 302 
 303 // Special handling for stack overflow: since we don't have any (java) stack
 304 // space left we use the pre-allocated & pre-initialized StackOverflowError
 305 // klass to create an stack overflow error instance.  We do not call its
 306 // constructor for the same reason (it is empty, anyway).
 307 IRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* thread))
 308   Handle exception = get_preinitialized_exception(
 309                                  SystemDictionary::StackOverflowError_klass(),
 310                                  CHECK);
 311   // Increment counter for hs_err file reporting
 312   Atomic::inc(&Exceptions::_stack_overflow_errors);
 313   THROW_HANDLE(exception);
 314 IRT_END
 315 
 316 IRT_ENTRY(void, InterpreterRuntime::throw_delayed_StackOverflowError(JavaThread* thread))
 317   Handle exception = get_preinitialized_exception(
 318                                  SystemDictionary::StackOverflowError_klass(),
 319                                  CHECK);
 320   java_lang_Throwable::set_message(exception(),
 321           Universe::delayed_stack_overflow_error_message());
 322   // Increment counter for hs_err file reporting
 323   Atomic::inc(&Exceptions::_stack_overflow_errors);
 324   THROW_HANDLE(exception);
 325 IRT_END
 326 
 327 IRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* thread, char* name, char* message))
 328   // lookup exception klass
 329   TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
 330   if (ProfileTraps) {
 331     if (s == vmSymbols::java_lang_ArithmeticException()) {
 332       note_trap(thread, Deoptimization::Reason_div0_check, CHECK);
 333     } else if (s == vmSymbols::java_lang_NullPointerException()) {
 334       note_trap(thread, Deoptimization::Reason_null_check, CHECK);
 335     }
 336   }
 337   // create exception
 338   Handle exception = Exceptions::new_exception(thread, s, message);
 339   thread->set_vm_result(exception());
 340 IRT_END
 341 
 342 
 343 IRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* thread, char* name, oopDesc* obj))
 344   ResourceMark rm(thread);
 345   const char* klass_name = obj->klass()->external_name();
 346   // lookup exception klass
 347   TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
 348   if (ProfileTraps) {
 349     note_trap(thread, Deoptimization::Reason_class_check, CHECK);
 350   }
 351   // create exception, with klass name as detail message
 352   Handle exception = Exceptions::new_exception(thread, s, klass_name);
 353   thread->set_vm_result(exception());
 354 IRT_END
 355 
 356 
 357 IRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* thread, char* name, jint index))
 358   char message[jintAsStringSize];
 359   // lookup exception klass
 360   TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
 361   if (ProfileTraps) {
 362     note_trap(thread, Deoptimization::Reason_range_check, CHECK);
 363   }
 364   // create exception
 365   sprintf(message, "%d", index);
 366   THROW_MSG(s, message);
 367 IRT_END
 368 
 369 IRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
 370   JavaThread* thread, oopDesc* obj))
 371 
 372   ResourceMark rm(thread);
 373   char* message = SharedRuntime::generate_class_cast_message(
 374     thread, obj->klass());
 375 
 376   if (ProfileTraps) {
 377     note_trap(thread, Deoptimization::Reason_class_check, CHECK);
 378   }
 379 
 380   // create exception
 381   THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
 382 IRT_END
 383 
 384 // exception_handler_for_exception(...) returns the continuation address,
 385 // the exception oop (via TLS) and sets the bci/bcp for the continuation.
 386 // The exception oop is returned to make sure it is preserved over GC (it
 387 // is only on the stack if the exception was thrown explicitly via athrow).
 388 // During this operation, the expression stack contains the values for the
 389 // bci where the exception happened. If the exception was propagated back
 390 // from a call, the expression stack contains the values for the bci at the
 391 // invoke w/o arguments (i.e., as if one were inside the call).
 392 IRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* thread, oopDesc* exception))
 393 
 394   Handle             h_exception(thread, exception);
 395   methodHandle       h_method   (thread, method(thread));
 396   constantPoolHandle h_constants(thread, h_method->constants());
 397   bool               should_repeat;
 398   int                handler_bci;
 399   int                current_bci = bci(thread);
 400 
 401   if (thread->frames_to_pop_failed_realloc() > 0) {
 402     // Allocation of scalar replaced object used in this frame
 403     // failed. Unconditionally pop the frame.
 404     thread->dec_frames_to_pop_failed_realloc();
 405     thread->set_vm_result(h_exception());
 406     // If the method is synchronized we already unlocked the monitor
 407     // during deoptimization so the interpreter needs to skip it when
 408     // the frame is popped.
 409     thread->set_do_not_unlock_if_synchronized(true);
 410 #ifdef CC_INTERP
 411     return (address) -1;
 412 #else
 413     return Interpreter::remove_activation_entry();
 414 #endif
 415   }
 416 
 417   // Need to do this check first since when _do_not_unlock_if_synchronized
 418   // is set, we don't want to trigger any classloading which may make calls
 419   // into java, or surprisingly find a matching exception handler for bci 0
 420   // since at this moment the method hasn't been "officially" entered yet.
 421   if (thread->do_not_unlock_if_synchronized()) {
 422     ResourceMark rm;
 423     assert(current_bci == 0,  "bci isn't zero for do_not_unlock_if_synchronized");
 424     thread->set_vm_result(exception);
 425 #ifdef CC_INTERP
 426     return (address) -1;
 427 #else
 428     return Interpreter::remove_activation_entry();
 429 #endif
 430   }
 431 
 432   do {
 433     should_repeat = false;
 434 
 435     // assertions
 436 #ifdef ASSERT
 437     assert(h_exception.not_null(), "NULL exceptions should be handled by athrow");
 438     // Check that exception is a subclass of Throwable, otherwise we have a VerifyError
 439     if (!(h_exception->is_a(SystemDictionary::Throwable_klass()))) {
 440       if (ExitVMOnVerifyError) vm_exit(-1);
 441       ShouldNotReachHere();
 442     }
 443 #endif
 444 
 445     // tracing
 446     if (log_is_enabled(Info, exceptions)) {
 447       ResourceMark rm(thread);
 448       stringStream tempst;
 449       tempst.print("interpreter method <%s>\n"
 450                    " at bci %d for thread " INTPTR_FORMAT,
 451                    h_method->print_value_string(), current_bci, p2i(thread));
 452       Exceptions::log_exception(h_exception, tempst);
 453     }
 454 // Don't go paging in something which won't be used.
 455 //     else if (extable->length() == 0) {
 456 //       // disabled for now - interpreter is not using shortcut yet
 457 //       // (shortcut is not to call runtime if we have no exception handlers)
 458 //       // warning("performance bug: should not call runtime if method has no exception handlers");
 459 //     }
 460     // for AbortVMOnException flag
 461     Exceptions::debug_check_abort(h_exception);
 462 
 463     // exception handler lookup
 464     Klass* klass = h_exception->klass();
 465     handler_bci = Method::fast_exception_handler_bci_for(h_method, klass, current_bci, THREAD);
 466     if (HAS_PENDING_EXCEPTION) {
 467       // We threw an exception while trying to find the exception handler.
 468       // Transfer the new exception to the exception handle which will
 469       // be set into thread local storage, and do another lookup for an
 470       // exception handler for this exception, this time starting at the
 471       // BCI of the exception handler which caused the exception to be
 472       // thrown (bug 4307310).
 473       h_exception = Handle(THREAD, PENDING_EXCEPTION);
 474       CLEAR_PENDING_EXCEPTION;
 475       if (handler_bci >= 0) {
 476         current_bci = handler_bci;
 477         should_repeat = true;
 478       }
 479     }
 480   } while (should_repeat == true);
 481 
 482 #if INCLUDE_JVMCI
 483   if (EnableJVMCI && h_method->method_data() != NULL) {
 484     ResourceMark rm(thread);
 485     ProfileData* pdata = h_method->method_data()->allocate_bci_to_data(current_bci, NULL);
 486     if (pdata != NULL && pdata->is_BitData()) {
 487       BitData* bit_data = (BitData*) pdata;
 488       bit_data->set_exception_seen();
 489     }
 490   }
 491 #endif
 492 
 493   // notify JVMTI of an exception throw; JVMTI will detect if this is a first
 494   // time throw or a stack unwinding throw and accordingly notify the debugger
 495   if (JvmtiExport::can_post_on_exceptions()) {
 496     JvmtiExport::post_exception_throw(thread, h_method(), bcp(thread), h_exception());
 497   }
 498 
 499 #ifdef CC_INTERP
 500   address continuation = (address)(intptr_t) handler_bci;
 501 #else
 502   address continuation = NULL;
 503 #endif
 504   address handler_pc = NULL;
 505   if (handler_bci < 0 || !thread->reguard_stack((address) &continuation)) {
 506     // Forward exception to callee (leaving bci/bcp untouched) because (a) no
 507     // handler in this method, or (b) after a stack overflow there is not yet
 508     // enough stack space available to reprotect the stack.
 509 #ifndef CC_INTERP
 510     continuation = Interpreter::remove_activation_entry();
 511 #endif
 512 #if COMPILER2_OR_JVMCI
 513     // Count this for compilation purposes
 514     h_method->interpreter_throwout_increment(THREAD);
 515 #endif
 516   } else {
 517     // handler in this method => change bci/bcp to handler bci/bcp and continue there
 518     handler_pc = h_method->code_base() + handler_bci;
 519 #ifndef CC_INTERP
 520     set_bcp_and_mdp(handler_pc, thread);
 521     continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
 522 #endif
 523   }
 524   // notify debugger of an exception catch
 525   // (this is good for exceptions caught in native methods as well)
 526   if (JvmtiExport::can_post_on_exceptions()) {
 527     JvmtiExport::notice_unwind_due_to_exception(thread, h_method(), handler_pc, h_exception(), (handler_pc != NULL));
 528   }
 529 
 530   thread->set_vm_result(h_exception());
 531   return continuation;
 532 IRT_END
 533 
 534 
 535 IRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* thread))
 536   assert(thread->has_pending_exception(), "must only ne called if there's an exception pending");
 537   // nothing to do - eventually we should remove this code entirely (see comments @ call sites)
 538 IRT_END
 539 
 540 
 541 IRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* thread))
 542   THROW(vmSymbols::java_lang_AbstractMethodError());
 543 IRT_END
 544 
 545 
 546 IRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))
 547   THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
 548 IRT_END
 549 
 550 
 551 //------------------------------------------------------------------------------------------------------------------------
 552 // Fields
 553 //
 554 
 555 void InterpreterRuntime::resolve_get_put(JavaThread* thread, Bytecodes::Code bytecode) {
 556   Thread* THREAD = thread;
 557   // resolve field
 558   fieldDescriptor info;
 559   constantPoolHandle pool(thread, method(thread)->constants());
 560   methodHandle m(thread, method(thread));
 561   bool is_put    = (bytecode == Bytecodes::_putfield  || bytecode == Bytecodes::_nofast_putfield ||
 562                     bytecode == Bytecodes::_putstatic);
 563   bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
 564 
 565   {
 566     JvmtiHideSingleStepping jhss(thread);
 567     LinkResolver::resolve_field_access(info, pool, get_index_u2_cpcache(thread, bytecode),
 568                                        m, bytecode, CHECK);
 569   } // end JvmtiHideSingleStepping
 570 
 571   // check if link resolution caused cpCache to be updated
 572   ConstantPoolCacheEntry* cp_cache_entry = cache_entry(thread);
 573   if (cp_cache_entry->is_resolved(bytecode)) return;
 574 
 575   // compute auxiliary field attributes
 576   TosState state  = as_TosState(info.field_type());
 577 
 578   // Resolution of put instructions on final fields is delayed. That is required so that
 579   // exceptions are thrown at the correct place (when the instruction is actually invoked).
 580   // If we do not resolve an instruction in the current pass, leaving the put_code
 581   // set to zero will cause the next put instruction to the same field to reresolve.
 582 
 583   // Resolution of put instructions to final instance fields with invalid updates (i.e.,
 584   // to final instance fields with updates originating from a method different than <init>)
 585   // is inhibited. A putfield instruction targeting an instance final field must throw
 586   // an IllegalAccessError if the instruction is not in an instance
 587   // initializer method <init>. If resolution were not inhibited, a putfield
 588   // in an initializer method could be resolved in the initializer. Subsequent
 589   // putfield instructions to the same field would then use cached information.
 590   // As a result, those instructions would not pass through the VM. That is,
 591   // checks in resolve_field_access() would not be executed for those instructions
 592   // and the required IllegalAccessError would not be thrown.
 593   //
 594   // Also, we need to delay resolving getstatic and putstatic instructions until the
 595   // class is initialized.  This is required so that access to the static
 596   // field will call the initialization function every time until the class
 597   // is completely initialized ala. in 2.17.5 in JVM Specification.
 598   InstanceKlass* klass = InstanceKlass::cast(info.field_holder());
 599   bool uninitialized_static = is_static && !klass->is_initialized();
 600   bool has_initialized_final_update = info.field_holder()->major_version() >= 53 &&
 601                                       info.has_initialized_final_update();
 602   assert(!(has_initialized_final_update && !info.access_flags().is_final()), "Fields with initialized final updates must be final");
 603 
 604   Bytecodes::Code get_code = (Bytecodes::Code)0;
 605   Bytecodes::Code put_code = (Bytecodes::Code)0;
 606   if (!uninitialized_static) {
 607     get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield);
 608     if ((is_put && !has_initialized_final_update) || !info.access_flags().is_final()) {
 609       put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
 610     }
 611   }
 612 
 613   cp_cache_entry->set_field(
 614     get_code,
 615     put_code,
 616     info.field_holder(),
 617     info.index(),
 618     info.offset(),
 619     state,
 620     info.access_flags().is_final(),
 621     info.access_flags().is_volatile(),
 622     pool->pool_holder()
 623   );
 624 }
 625 
 626 
 627 //------------------------------------------------------------------------------------------------------------------------
 628 // Synchronization
 629 //
 630 // The interpreter's synchronization code is factored out so that it can
 631 // be shared by method invocation and synchronized blocks.
 632 //%note synchronization_3
 633 
 634 //%note monitor_1
 635 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* thread, BasicObjectLock* elem))
 636 #ifdef ASSERT
 637   thread->last_frame().interpreter_frame_verify_monitor(elem);
 638 #endif
 639   if (PrintBiasedLockingStatistics) {
 640     Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
 641   }
 642   Handle h_obj(thread, elem->obj());
 643   assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
 644          "must be NULL or an object");
 645   if (UseBiasedLocking) {
 646     // Retry fast entry if bias is revoked to avoid unnecessary inflation
 647     ObjectSynchronizer::fast_enter(h_obj, elem->lock(), true, CHECK);
 648   } else {
 649     ObjectSynchronizer::slow_enter(h_obj, elem->lock(), CHECK);
 650   }
 651   assert(Universe::heap()->is_in_reserved_or_null(elem->obj()),
 652          "must be NULL or an object");
 653 #ifdef ASSERT
 654   thread->last_frame().interpreter_frame_verify_monitor(elem);
 655 #endif
 656 IRT_END
 657 
 658 
 659 //%note monitor_1
 660 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorexit(JavaThread* thread, BasicObjectLock* elem))
 661 #ifdef ASSERT
 662   thread->last_frame().interpreter_frame_verify_monitor(elem);
 663 #endif
 664   Handle h_obj(thread, elem->obj());
 665   assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
 666          "must be NULL or an object");
 667   if (elem == NULL || h_obj()->is_unlocked()) {
 668     THROW(vmSymbols::java_lang_IllegalMonitorStateException());
 669   }
 670   ObjectSynchronizer::slow_exit(h_obj(), elem->lock(), thread);
 671   // Free entry. This must be done here, since a pending exception might be installed on
 672   // exit. If it is not cleared, the exception handling code will try to unlock the monitor again.
 673   elem->set_obj(NULL);
 674 #ifdef ASSERT
 675   thread->last_frame().interpreter_frame_verify_monitor(elem);
 676 #endif
 677 IRT_END
 678 
 679 
 680 IRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* thread))
 681   THROW(vmSymbols::java_lang_IllegalMonitorStateException());
 682 IRT_END
 683 
 684 
 685 IRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* thread))
 686   // Returns an illegal exception to install into the current thread. The
 687   // pending_exception flag is cleared so normal exception handling does not
 688   // trigger. Any current installed exception will be overwritten. This
 689   // method will be called during an exception unwind.
 690 
 691   assert(!HAS_PENDING_EXCEPTION, "no pending exception");
 692   Handle exception(thread, thread->vm_result());
 693   assert(exception() != NULL, "vm result should be set");
 694   thread->set_vm_result(NULL); // clear vm result before continuing (may cause memory leaks and assert failures)
 695   if (!exception->is_a(SystemDictionary::ThreadDeath_klass())) {
 696     exception = get_preinitialized_exception(
 697                        SystemDictionary::IllegalMonitorStateException_klass(),
 698                        CATCH);
 699   }
 700   thread->set_vm_result(exception());
 701 IRT_END
 702 
 703 
 704 //------------------------------------------------------------------------------------------------------------------------
 705 // Invokes
 706 
 707 IRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* thread, Method* method, address bcp))
 708   return method->orig_bytecode_at(method->bci_from(bcp));
 709 IRT_END
 710 
 711 IRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* thread, Method* method, address bcp, Bytecodes::Code new_code))
 712   method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
 713 IRT_END
 714 
 715 IRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* thread, Method* method, address bcp))
 716   JvmtiExport::post_raw_breakpoint(thread, method, bcp);
 717 IRT_END
 718 
 719 void InterpreterRuntime::resolve_invoke(JavaThread* thread, Bytecodes::Code bytecode) {
 720   Thread* THREAD = thread;
 721   // extract receiver from the outgoing argument list if necessary
 722   Handle receiver(thread, NULL);
 723   if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface ||
 724       bytecode == Bytecodes::_invokespecial) {
 725     ResourceMark rm(thread);
 726     methodHandle m (thread, method(thread));
 727     Bytecode_invoke call(m, bci(thread));
 728     Symbol* signature = call.signature();
 729     receiver = Handle(thread,
 730                   thread->last_frame().interpreter_callee_receiver(signature));
 731     assert(Universe::heap()->is_in_reserved_or_null(receiver()),
 732            "sanity check");
 733     assert(receiver.is_null() ||
 734            !Universe::heap()->is_in_reserved(receiver->klass()),
 735            "sanity check");
 736   }
 737 
 738   // resolve method
 739   CallInfo info;
 740   constantPoolHandle pool(thread, method(thread)->constants());
 741 
 742   {
 743     JvmtiHideSingleStepping jhss(thread);
 744     LinkResolver::resolve_invoke(info, receiver, pool,
 745                                  get_index_u2_cpcache(thread, bytecode), bytecode,
 746                                  CHECK);
 747     if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
 748       int retry_count = 0;
 749       while (info.resolved_method()->is_old()) {
 750         // It is very unlikely that method is redefined more than 100 times
 751         // in the middle of resolve. If it is looping here more than 100 times
 752         // means then there could be a bug here.
 753         guarantee((retry_count++ < 100),
 754                   "Could not resolve to latest version of redefined method");
 755         // method is redefined in the middle of resolve so re-try.
 756         LinkResolver::resolve_invoke(info, receiver, pool,
 757                                      get_index_u2_cpcache(thread, bytecode), bytecode,
 758                                      CHECK);
 759       }
 760     }
 761   } // end JvmtiHideSingleStepping
 762 
 763   // check if link resolution caused cpCache to be updated
 764   ConstantPoolCacheEntry* cp_cache_entry = cache_entry(thread);
 765   if (cp_cache_entry->is_resolved(bytecode)) return;
 766 
 767 #ifdef ASSERT
 768   if (bytecode == Bytecodes::_invokeinterface) {
 769     if (info.resolved_method()->method_holder() ==
 770                                             SystemDictionary::Object_klass()) {
 771       // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
 772       // (see also CallInfo::set_interface for details)
 773       assert(info.call_kind() == CallInfo::vtable_call ||
 774              info.call_kind() == CallInfo::direct_call, "");
 775       methodHandle rm = info.resolved_method();
 776       assert(rm->is_final() || info.has_vtable_index(),
 777              "should have been set already");
 778     } else if (!info.resolved_method()->has_itable_index()) {
 779       // Resolved something like CharSequence.toString.  Use vtable not itable.
 780       assert(info.call_kind() != CallInfo::itable_call, "");
 781     } else {
 782       // Setup itable entry
 783       assert(info.call_kind() == CallInfo::itable_call, "");
 784       int index = info.resolved_method()->itable_index();
 785       assert(info.itable_index() == index, "");
 786     }
 787   } else if (bytecode == Bytecodes::_invokespecial) {
 788     assert(info.call_kind() == CallInfo::direct_call, "must be direct call");
 789   } else {
 790     assert(info.call_kind() == CallInfo::direct_call ||
 791            info.call_kind() == CallInfo::vtable_call, "");
 792   }
 793 #endif
 794   // Get sender or sender's host_klass, and only set cpCache entry to resolved if
 795   // it is not an interface.  The receiver for invokespecial calls within interface
 796   // methods must be checked for every call.
 797   InstanceKlass* sender = pool->pool_holder();
 798   sender = sender->is_anonymous() ? sender->host_klass() : sender;
 799 
 800   switch (info.call_kind()) {
 801   case CallInfo::direct_call:
 802     cp_cache_entry->set_direct_call(
 803       bytecode,
 804       info.resolved_method(),
 805       sender->is_interface());
 806     break;
 807   case CallInfo::vtable_call:
 808     cp_cache_entry->set_vtable_call(
 809       bytecode,
 810       info.resolved_method(),
 811       info.vtable_index());
 812     break;
 813   case CallInfo::itable_call:
 814     cp_cache_entry->set_itable_call(
 815       bytecode,
 816       info.resolved_method(),
 817       info.itable_index());
 818     break;
 819   default:  ShouldNotReachHere();
 820   }
 821 }
 822 
 823 
 824 // First time execution:  Resolve symbols, create a permanent MethodType object.
 825 void InterpreterRuntime::resolve_invokehandle(JavaThread* thread) {
 826   Thread* THREAD = thread;
 827   const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
 828 
 829   // resolve method
 830   CallInfo info;
 831   constantPoolHandle pool(thread, method(thread)->constants());
 832   {
 833     JvmtiHideSingleStepping jhss(thread);
 834     LinkResolver::resolve_invoke(info, Handle(), pool,
 835                                  get_index_u2_cpcache(thread, bytecode), bytecode,
 836                                  CHECK);
 837   } // end JvmtiHideSingleStepping
 838 
 839   ConstantPoolCacheEntry* cp_cache_entry = cache_entry(thread);
 840   cp_cache_entry->set_method_handle(pool, info);
 841 }
 842 
 843 // First time execution:  Resolve symbols, create a permanent CallSite object.
 844 void InterpreterRuntime::resolve_invokedynamic(JavaThread* thread) {
 845   Thread* THREAD = thread;
 846   const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
 847 
 848   //TO DO: consider passing BCI to Java.
 849   //  int caller_bci = method(thread)->bci_from(bcp(thread));
 850 
 851   // resolve method
 852   CallInfo info;
 853   constantPoolHandle pool(thread, method(thread)->constants());
 854   int index = get_index_u4(thread, bytecode);
 855   {
 856     JvmtiHideSingleStepping jhss(thread);
 857     LinkResolver::resolve_invoke(info, Handle(), pool,
 858                                  index, bytecode, CHECK);
 859   } // end JvmtiHideSingleStepping
 860 
 861   ConstantPoolCacheEntry* cp_cache_entry = pool->invokedynamic_cp_cache_entry_at(index);
 862   cp_cache_entry->set_dynamic_call(pool, info);
 863 }
 864 
 865 // This function is the interface to the assembly code. It returns the resolved
 866 // cpCache entry.  This doesn't safepoint, but the helper routines safepoint.
 867 // This function will check for redefinition!
 868 IRT_ENTRY(void, InterpreterRuntime::resolve_from_cache(JavaThread* thread, Bytecodes::Code bytecode)) {
 869   switch (bytecode) {
 870   case Bytecodes::_getstatic:
 871   case Bytecodes::_putstatic:
 872   case Bytecodes::_getfield:
 873   case Bytecodes::_putfield:
 874     resolve_get_put(thread, bytecode);
 875     break;
 876   case Bytecodes::_invokevirtual:
 877   case Bytecodes::_invokespecial:
 878   case Bytecodes::_invokestatic:
 879   case Bytecodes::_invokeinterface:
 880     resolve_invoke(thread, bytecode);
 881     break;
 882   case Bytecodes::_invokehandle:
 883     resolve_invokehandle(thread);
 884     break;
 885   case Bytecodes::_invokedynamic:
 886     resolve_invokedynamic(thread);
 887     break;
 888   default:
 889     fatal("unexpected bytecode: %s", Bytecodes::name(bytecode));
 890     break;
 891   }
 892 }
 893 IRT_END
 894 
 895 //------------------------------------------------------------------------------------------------------------------------
 896 // Miscellaneous
 897 
 898 
 899 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* thread, address branch_bcp) {
 900   nmethod* nm = frequency_counter_overflow_inner(thread, branch_bcp);
 901   assert(branch_bcp != NULL || nm == NULL, "always returns null for non OSR requests");
 902   if (branch_bcp != NULL && nm != NULL) {
 903     // This was a successful request for an OSR nmethod.  Because
 904     // frequency_counter_overflow_inner ends with a safepoint check,
 905     // nm could have been unloaded so look it up again.  It's unsafe
 906     // to examine nm directly since it might have been freed and used
 907     // for something else.
 908     frame fr = thread->last_frame();
 909     Method* method =  fr.interpreter_frame_method();
 910     int bci = method->bci_from(fr.interpreter_frame_bcp());
 911     nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
 912   }
 913 #ifndef PRODUCT
 914   if (TraceOnStackReplacement) {
 915     if (nm != NULL) {
 916       tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", p2i(nm->osr_entry()));
 917       nm->print();
 918     }
 919   }
 920 #endif
 921   return nm;
 922 }
 923 
 924 IRT_ENTRY(nmethod*,
 925           InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* thread, address branch_bcp))
 926   // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
 927   // flag, in case this method triggers classloading which will call into Java.
 928   UnlockFlagSaver fs(thread);
 929 
 930   frame fr = thread->last_frame();
 931   assert(fr.is_interpreted_frame(), "must come from interpreter");
 932   methodHandle method(thread, fr.interpreter_frame_method());
 933   const int branch_bci = branch_bcp != NULL ? method->bci_from(branch_bcp) : InvocationEntryBci;
 934   const int bci = branch_bcp != NULL ? method->bci_from(fr.interpreter_frame_bcp()) : InvocationEntryBci;
 935 
 936   assert(!HAS_PENDING_EXCEPTION, "Should not have any exceptions pending");
 937   nmethod* osr_nm = CompilationPolicy::policy()->event(method, method, branch_bci, bci, CompLevel_none, NULL, thread);
 938   assert(!HAS_PENDING_EXCEPTION, "Event handler should not throw any exceptions");
 939 
 940   if (osr_nm != NULL) {
 941     // We may need to do on-stack replacement which requires that no
 942     // monitors in the activation are biased because their
 943     // BasicObjectLocks will need to migrate during OSR. Force
 944     // unbiasing of all monitors in the activation now (even though
 945     // the OSR nmethod might be invalidated) because we don't have a
 946     // safepoint opportunity later once the migration begins.
 947     if (UseBiasedLocking) {
 948       ResourceMark rm;
 949       GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>();
 950       for( BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
 951            kptr < fr.interpreter_frame_monitor_begin();
 952            kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
 953         if( kptr->obj() != NULL ) {
 954           objects_to_revoke->append(Handle(THREAD, kptr->obj()));
 955         }
 956       }
 957       BiasedLocking::revoke(objects_to_revoke);
 958     }
 959   }
 960   return osr_nm;
 961 IRT_END
 962 
 963 IRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp))
 964   assert(ProfileInterpreter, "must be profiling interpreter");
 965   int bci = method->bci_from(cur_bcp);
 966   MethodData* mdo = method->method_data();
 967   if (mdo == NULL)  return 0;
 968   return mdo->bci_to_di(bci);
 969 IRT_END
 970 
 971 IRT_ENTRY(void, InterpreterRuntime::profile_method(JavaThread* thread))
 972   // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
 973   // flag, in case this method triggers classloading which will call into Java.
 974   UnlockFlagSaver fs(thread);
 975 
 976   assert(ProfileInterpreter, "must be profiling interpreter");
 977   frame fr = thread->last_frame();
 978   assert(fr.is_interpreted_frame(), "must come from interpreter");
 979   methodHandle method(thread, fr.interpreter_frame_method());
 980   Method::build_interpreter_method_data(method, THREAD);
 981   if (HAS_PENDING_EXCEPTION) {
 982     assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
 983     CLEAR_PENDING_EXCEPTION;
 984     // and fall through...
 985   }
 986 IRT_END
 987 
 988 
 989 #ifdef ASSERT
 990 IRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp))
 991   assert(ProfileInterpreter, "must be profiling interpreter");
 992 
 993   MethodData* mdo = method->method_data();
 994   assert(mdo != NULL, "must not be null");
 995 
 996   int bci = method->bci_from(bcp);
 997 
 998   address mdp2 = mdo->bci_to_dp(bci);
 999   if (mdp != mdp2) {
1000     ResourceMark rm;
1001     ResetNoHandleMark rnm; // In a LEAF entry.
1002     HandleMark hm;
1003     tty->print_cr("FAILED verify : actual mdp %p   expected mdp %p @ bci %d", mdp, mdp2, bci);
1004     int current_di = mdo->dp_to_di(mdp);
1005     int expected_di  = mdo->dp_to_di(mdp2);
1006     tty->print_cr("  actual di %d   expected di %d", current_di, expected_di);
1007     int expected_approx_bci = mdo->data_at(expected_di)->bci();
1008     int approx_bci = -1;
1009     if (current_di >= 0) {
1010       approx_bci = mdo->data_at(current_di)->bci();
1011     }
1012     tty->print_cr("  actual bci is %d  expected bci %d", approx_bci, expected_approx_bci);
1013     mdo->print_on(tty);
1014     method->print_codes();
1015   }
1016   assert(mdp == mdp2, "wrong mdp");
1017 IRT_END
1018 #endif // ASSERT
1019 
1020 IRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* thread, int return_bci))
1021   assert(ProfileInterpreter, "must be profiling interpreter");
1022   ResourceMark rm(thread);
1023   HandleMark hm(thread);
1024   frame fr = thread->last_frame();
1025   assert(fr.is_interpreted_frame(), "must come from interpreter");
1026   MethodData* h_mdo = fr.interpreter_frame_method()->method_data();
1027 
1028   // Grab a lock to ensure atomic access to setting the return bci and
1029   // the displacement.  This can block and GC, invalidating all naked oops.
1030   MutexLocker ml(RetData_lock);
1031 
1032   // ProfileData is essentially a wrapper around a derived oop, so we
1033   // need to take the lock before making any ProfileData structures.
1034   ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(fr.interpreter_frame_mdp()));
1035   guarantee(data != NULL, "profile data must be valid");
1036   RetData* rdata = data->as_RetData();
1037   address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
1038   fr.interpreter_frame_set_mdp(new_mdp);
1039 IRT_END
1040 
1041 IRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* thread, Method* m))
1042   MethodCounters* mcs = Method::build_method_counters(m, thread);
1043   if (HAS_PENDING_EXCEPTION) {
1044     assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
1045     CLEAR_PENDING_EXCEPTION;
1046   }
1047   return mcs;
1048 IRT_END
1049 
1050 
1051 IRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* thread))
1052   // We used to need an explict preserve_arguments here for invoke bytecodes. However,
1053   // stack traversal automatically takes care of preserving arguments for invoke, so
1054   // this is no longer needed.
1055 
1056   // IRT_END does an implicit safepoint check, hence we are guaranteed to block
1057   // if this is called during a safepoint
1058 
1059   if (JvmtiExport::should_post_single_step()) {
1060     // We are called during regular safepoints and when the VM is
1061     // single stepping. If any thread is marked for single stepping,
1062     // then we may have JVMTI work to do.
1063     JvmtiExport::at_single_stepping_point(thread, method(thread), bcp(thread));
1064   }
1065 IRT_END
1066 
1067 IRT_ENTRY(void, InterpreterRuntime::enter_continuation(JavaThread* thread, oopDesc* cont))
1068   tty->print_cr(" --- cont enter ---");
1069   Handle receiver(thread, cont);
1070   JavaValue result(T_VOID);
1071   JavaCalls::call_virtual(&result, receiver, SystemDictionary::Continuation_klass(), vmSymbols::enter_name(), vmSymbols::continuationEnter_signature(), thread);
1072   tty->print_cr(" --- cont exit ---");
1073 IRT_END
1074 
1075 IRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread *thread, oopDesc* obj,
1076 ConstantPoolCacheEntry *cp_entry))
1077 
1078   // check the access_flags for the field in the klass
1079 
1080   InstanceKlass* ik = InstanceKlass::cast(cp_entry->f1_as_klass());
1081   int index = cp_entry->field_index();
1082   if ((ik->field_access_flags(index) & JVM_ACC_FIELD_ACCESS_WATCHED) == 0) return;
1083 
1084   bool is_static = (obj == NULL);
1085   HandleMark hm(thread);
1086 
1087   Handle h_obj;
1088   if (!is_static) {
1089     // non-static field accessors have an object, but we need a handle
1090     h_obj = Handle(thread, obj);
1091   }
1092   InstanceKlass* cp_entry_f1 = InstanceKlass::cast(cp_entry->f1_as_klass());
1093   jfieldID fid = jfieldIDWorkaround::to_jfieldID(cp_entry_f1, cp_entry->f2_as_index(), is_static);
1094   JvmtiExport::post_field_access(thread, method(thread), bcp(thread), cp_entry_f1, h_obj, fid);
1095 IRT_END
1096 
1097 IRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread *thread,
1098   oopDesc* obj, ConstantPoolCacheEntry *cp_entry, jvalue *value))
1099 
1100   Klass* k = cp_entry->f1_as_klass();
1101 
1102   // check the access_flags for the field in the klass
1103   InstanceKlass* ik = InstanceKlass::cast(k);
1104   int index = cp_entry->field_index();
1105   // bail out if field modifications are not watched
1106   if ((ik->field_access_flags(index) & JVM_ACC_FIELD_MODIFICATION_WATCHED) == 0) return;
1107 
1108   char sig_type = '\0';
1109 
1110   switch(cp_entry->flag_state()) {
1111     case btos: sig_type = 'B'; break;
1112     case ztos: sig_type = 'Z'; break;
1113     case ctos: sig_type = 'C'; break;
1114     case stos: sig_type = 'S'; break;
1115     case itos: sig_type = 'I'; break;
1116     case ftos: sig_type = 'F'; break;
1117     case atos: sig_type = 'L'; break;
1118     case ltos: sig_type = 'J'; break;
1119     case dtos: sig_type = 'D'; break;
1120     default:  ShouldNotReachHere(); return;
1121   }
1122   bool is_static = (obj == NULL);
1123 
1124   HandleMark hm(thread);
1125   jfieldID fid = jfieldIDWorkaround::to_jfieldID(ik, cp_entry->f2_as_index(), is_static);
1126   jvalue fvalue;
1127 #ifdef _LP64
1128   fvalue = *value;
1129 #else
1130   // Long/double values are stored unaligned and also noncontiguously with
1131   // tagged stacks.  We can't just do a simple assignment even in the non-
1132   // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1133   // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1134   // We assume that the two halves of longs/doubles are stored in interpreter
1135   // stack slots in platform-endian order.
1136   jlong_accessor u;
1137   jint* newval = (jint*)value;
1138   u.words[0] = newval[0];
1139   u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1140   fvalue.j = u.long_value;
1141 #endif // _LP64
1142 
1143   Handle h_obj;
1144   if (!is_static) {
1145     // non-static field accessors have an object, but we need a handle
1146     h_obj = Handle(thread, obj);
1147   }
1148 
1149   JvmtiExport::post_raw_field_modification(thread, method(thread), bcp(thread), ik, h_obj,
1150                                            fid, sig_type, &fvalue);
1151 IRT_END
1152 
1153 IRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread *thread))
1154   JvmtiExport::post_method_entry(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread));
1155 IRT_END
1156 
1157 
1158 IRT_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread *thread))
1159   JvmtiExport::post_method_exit(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread));
1160 IRT_END
1161 
1162 IRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1163 {
1164   return (Interpreter::contains(pc) ? 1 : 0);
1165 }
1166 IRT_END
1167 
1168 
1169 // Implementation of SignatureHandlerLibrary
1170 
1171 #ifndef SHARING_FAST_NATIVE_FINGERPRINTS
1172 // Dummy definition (else normalization method is defined in CPU
1173 // dependant code)
1174 uint64_t InterpreterRuntime::normalize_fast_native_fingerprint(uint64_t fingerprint) {
1175   return fingerprint;
1176 }
1177 #endif
1178 
1179 address SignatureHandlerLibrary::set_handler_blob() {
1180   BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1181   if (handler_blob == NULL) {
1182     return NULL;
1183   }
1184   address handler = handler_blob->code_begin();
1185   _handler_blob = handler_blob;
1186   _handler = handler;
1187   return handler;
1188 }
1189 
1190 void SignatureHandlerLibrary::initialize() {
1191   if (_fingerprints != NULL) {
1192     return;
1193   }
1194   if (set_handler_blob() == NULL) {
1195     vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers");
1196   }
1197 
1198   BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1199                                       SignatureHandlerLibrary::buffer_size);
1200   _buffer = bb->code_begin();
1201 
1202   _fingerprints = new(ResourceObj::C_HEAP, mtCode)GrowableArray<uint64_t>(32, true);
1203   _handlers     = new(ResourceObj::C_HEAP, mtCode)GrowableArray<address>(32, true);
1204 }
1205 
1206 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1207   address handler   = _handler;
1208   int     insts_size = buffer->pure_insts_size();
1209   if (handler + insts_size > _handler_blob->code_end()) {
1210     // get a new handler blob
1211     handler = set_handler_blob();
1212   }
1213   if (handler != NULL) {
1214     memcpy(handler, buffer->insts_begin(), insts_size);
1215     pd_set_handler(handler);
1216     ICache::invalidate_range(handler, insts_size);
1217     _handler = handler + insts_size;
1218   }
1219   return handler;
1220 }
1221 
1222 void SignatureHandlerLibrary::add(const methodHandle& method) {
1223   if (method->signature_handler() == NULL) {
1224     // use slow signature handler if we can't do better
1225     int handler_index = -1;
1226     // check if we can use customized (fast) signature handler
1227     if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::max_size_of_parameters) {
1228       // use customized signature handler
1229       MutexLocker mu(SignatureHandlerLibrary_lock);
1230       // make sure data structure is initialized
1231       initialize();
1232       // lookup method signature's fingerprint
1233       uint64_t fingerprint = Fingerprinter(method).fingerprint();
1234       // allow CPU dependant code to optimize the fingerprints for the fast handler
1235       fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1236       handler_index = _fingerprints->find(fingerprint);
1237       // create handler if necessary
1238       if (handler_index < 0) {
1239         ResourceMark rm;
1240         ptrdiff_t align_offset = align_up(_buffer, CodeEntryAlignment) - (address)_buffer;
1241         CodeBuffer buffer((address)(_buffer + align_offset),
1242                           SignatureHandlerLibrary::buffer_size - align_offset);
1243         InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1244         // copy into code heap
1245         address handler = set_handler(&buffer);
1246         if (handler == NULL) {
1247           // use slow signature handler (without memorizing it in the fingerprints)
1248         } else {
1249           // debugging suppport
1250           if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1251             ttyLocker ttyl;
1252             tty->cr();
1253             tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1254                           _handlers->length(),
1255                           (method->is_static() ? "static" : "receiver"),
1256                           method->name_and_sig_as_C_string(),
1257                           fingerprint,
1258                           buffer.insts_size());
1259             if (buffer.insts_size() > 0) {
1260               Disassembler::decode(handler, handler + buffer.insts_size());
1261             }
1262 #ifndef PRODUCT
1263             address rh_begin = Interpreter::result_handler(method()->result_type());
1264             if (CodeCache::contains(rh_begin)) {
1265               // else it might be special platform dependent values
1266               tty->print_cr(" --- associated result handler ---");
1267               address rh_end = rh_begin;
1268               while (*(int*)rh_end != 0) {
1269                 rh_end += sizeof(int);
1270               }
1271               Disassembler::decode(rh_begin, rh_end);
1272             } else {
1273               tty->print_cr(" associated result handler: " PTR_FORMAT, p2i(rh_begin));
1274             }
1275 #endif
1276           }
1277           // add handler to library
1278           _fingerprints->append(fingerprint);
1279           _handlers->append(handler);
1280           // set handler index
1281           assert(_fingerprints->length() == _handlers->length(), "sanity check");
1282           handler_index = _fingerprints->length() - 1;
1283         }
1284       }
1285       // Set handler under SignatureHandlerLibrary_lock
1286       if (handler_index < 0) {
1287         // use generic signature handler
1288         method->set_signature_handler(Interpreter::slow_signature_handler());
1289       } else {
1290         // set handler
1291         method->set_signature_handler(_handlers->at(handler_index));
1292       }
1293     } else {
1294       CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
1295       // use generic signature handler
1296       method->set_signature_handler(Interpreter::slow_signature_handler());
1297     }
1298   }
1299 #ifdef ASSERT
1300   int handler_index = -1;
1301   int fingerprint_index = -2;
1302   {
1303     // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized
1304     // in any way if accessed from multiple threads. To avoid races with another
1305     // thread which may change the arrays in the above, mutex protected block, we
1306     // have to protect this read access here with the same mutex as well!
1307     MutexLocker mu(SignatureHandlerLibrary_lock);
1308     if (_handlers != NULL) {
1309       handler_index = _handlers->find(method->signature_handler());
1310       uint64_t fingerprint = Fingerprinter(method).fingerprint();
1311       fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1312       fingerprint_index = _fingerprints->find(fingerprint);
1313     }
1314   }
1315   assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1316          handler_index == fingerprint_index, "sanity check");
1317 #endif // ASSERT
1318 }
1319 
1320 void SignatureHandlerLibrary::add(uint64_t fingerprint, address handler) {
1321   int handler_index = -1;
1322   // use customized signature handler
1323   MutexLocker mu(SignatureHandlerLibrary_lock);
1324   // make sure data structure is initialized
1325   initialize();
1326   fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1327   handler_index = _fingerprints->find(fingerprint);
1328   // create handler if necessary
1329   if (handler_index < 0) {
1330     if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1331       tty->cr();
1332       tty->print_cr("argument handler #%d at " PTR_FORMAT " for fingerprint " UINT64_FORMAT,
1333                     _handlers->length(),
1334                     p2i(handler),
1335                     fingerprint);
1336     }
1337     _fingerprints->append(fingerprint);
1338     _handlers->append(handler);
1339   } else {
1340     if (PrintSignatureHandlers) {
1341       tty->cr();
1342       tty->print_cr("duplicate argument handler #%d for fingerprint " UINT64_FORMAT "(old: " PTR_FORMAT ", new : " PTR_FORMAT ")",
1343                     _handlers->length(),
1344                     fingerprint,
1345                     p2i(_handlers->at(handler_index)),
1346                     p2i(handler));
1347     }
1348   }
1349 }
1350 
1351 
1352 BufferBlob*              SignatureHandlerLibrary::_handler_blob = NULL;
1353 address                  SignatureHandlerLibrary::_handler      = NULL;
1354 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = NULL;
1355 GrowableArray<address>*  SignatureHandlerLibrary::_handlers     = NULL;
1356 address                  SignatureHandlerLibrary::_buffer       = NULL;
1357 
1358 
1359 IRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* thread, Method* method))
1360   methodHandle m(thread, method);
1361   assert(m->is_native(), "sanity check");
1362   // lookup native function entry point if it doesn't exist
1363   bool in_base_library;
1364   if (!m->has_native_function()) {
1365     NativeLookup::lookup(m, in_base_library, CHECK);
1366   }
1367   // make sure signature handler is installed
1368   SignatureHandlerLibrary::add(m);
1369   // The interpreter entry point checks the signature handler first,
1370   // before trying to fetch the native entry point and klass mirror.
1371   // We must set the signature handler last, so that multiple processors
1372   // preparing the same method will be sure to see non-null entry & mirror.
1373 IRT_END
1374 
1375 #if defined(IA32) || defined(AMD64) || defined(ARM)
1376 IRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* thread, void* src_address, void* dest_address))
1377   if (src_address == dest_address) {
1378     return;
1379   }
1380   ResetNoHandleMark rnm; // In a LEAF entry.
1381   HandleMark hm;
1382   ResourceMark rm;
1383   frame fr = thread->last_frame();
1384   assert(fr.is_interpreted_frame(), "");
1385   jint bci = fr.interpreter_frame_bci();
1386   methodHandle mh(thread, fr.interpreter_frame_method());
1387   Bytecode_invoke invoke(mh, bci);
1388   ArgumentSizeComputer asc(invoke.signature());
1389   int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver
1390   Copy::conjoint_jbytes(src_address, dest_address,
1391                        size_of_arguments * Interpreter::stackElementSize);
1392 IRT_END
1393 #endif
1394 
1395 #if INCLUDE_JVMTI
1396 // This is a support of the JVMTI PopFrame interface.
1397 // Make sure it is an invokestatic of a polymorphic intrinsic that has a member_name argument
1398 // and return it as a vm_result so that it can be reloaded in the list of invokestatic parameters.
1399 // The member_name argument is a saved reference (in local#0) to the member_name.
1400 // For backward compatibility with some JDK versions (7, 8) it can also be a direct method handle.
1401 // FIXME: remove DMH case after j.l.i.InvokerBytecodeGenerator code shape is updated.
1402 IRT_ENTRY(void, InterpreterRuntime::member_name_arg_or_null(JavaThread* thread, address member_name,
1403                                                             Method* method, address bcp))
1404   Bytecodes::Code code = Bytecodes::code_at(method, bcp);
1405   if (code != Bytecodes::_invokestatic) {
1406     return;
1407   }
1408   ConstantPool* cpool = method->constants();
1409   int cp_index = Bytes::get_native_u2(bcp + 1) + ConstantPool::CPCACHE_INDEX_TAG;
1410   Symbol* cname = cpool->klass_name_at(cpool->klass_ref_index_at(cp_index));
1411   Symbol* mname = cpool->name_ref_at(cp_index);
1412 
1413   if (MethodHandles::has_member_arg(cname, mname)) {
1414     oop member_name_oop = (oop) member_name;
1415     if (java_lang_invoke_DirectMethodHandle::is_instance(member_name_oop)) {
1416       // FIXME: remove after j.l.i.InvokerBytecodeGenerator code shape is updated.
1417       member_name_oop = java_lang_invoke_DirectMethodHandle::member(member_name_oop);
1418     }
1419     thread->set_vm_result(member_name_oop);
1420   } else {
1421     thread->set_vm_result(NULL);
1422   }
1423 IRT_END
1424 #endif // INCLUDE_JVMTI
1425 
1426 #ifndef PRODUCT
1427 // This must be a IRT_LEAF function because the interpreter must save registers on x86 to
1428 // call this, which changes rsp and makes the interpreter's expression stack not walkable.
1429 // The generated code still uses call_VM because that will set up the frame pointer for
1430 // bcp and method.
1431 IRT_LEAF(intptr_t, InterpreterRuntime::trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2))
1432   const frame f = thread->last_frame();
1433   assert(f.is_interpreted_frame(), "must be an interpreted frame");
1434   methodHandle mh(thread, f.interpreter_frame_method());
1435   BytecodeTracer::trace(mh, f.interpreter_frame_bcp(), tos, tos2);
1436   return preserve_this_value;
1437 IRT_END
1438 #endif // !PRODUCT