1 /*
   2  * Copyright (c) 1997, 2013, 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 class UnlockFlagSaver {
  79   private:
  80     JavaThread* _thread;
  81     bool _do_not_unlock;
  82   public:
  83     UnlockFlagSaver(JavaThread* t) {
  84       _thread = t;
  85       _do_not_unlock = t->do_not_unlock_if_synchronized();
  86       t->set_do_not_unlock_if_synchronized(false);
  87     }
  88     ~UnlockFlagSaver() {
  89       _thread->set_do_not_unlock_if_synchronized(_do_not_unlock);
  90     }
  91 };
  92 
  93 //------------------------------------------------------------------------------------------------------------------------
  94 // State accessors
  95 
  96 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread *thread) {
  97   last_frame(thread).interpreter_frame_set_bcp(bcp);
  98   if (ProfileInterpreter) {
  99     // ProfileTraps uses MDOs independently of ProfileInterpreter.
 100     // That is why we must check both ProfileInterpreter and mdo != NULL.
 101     MethodData* mdo = last_frame(thread).interpreter_frame_method()->method_data();
 102     if (mdo != NULL) {
 103       NEEDS_CLEANUP;
 104       last_frame(thread).interpreter_frame_set_mdp(mdo->bci_to_dp(last_frame(thread).interpreter_frame_bci()));
 105     }
 106   }
 107 }
 108 
 109 //------------------------------------------------------------------------------------------------------------------------
 110 // Constants
 111 
 112 
 113 IRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* thread, bool wide))
 114   // access constant pool
 115   ConstantPool* pool = method(thread)->constants();
 116   int index = wide ? get_index_u2(thread, Bytecodes::_ldc_w) : get_index_u1(thread, Bytecodes::_ldc);
 117   constantTag tag = pool->tag_at(index);
 118 
 119   assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call");
 120   Klass* klass = pool->klass_at(index, CHECK);
 121     oop java_class = klass->java_mirror();
 122     thread->set_vm_result(java_class);
 123 IRT_END
 124 
 125 IRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* thread, Bytecodes::Code bytecode)) {
 126   assert(bytecode == Bytecodes::_fast_aldc ||
 127          bytecode == Bytecodes::_fast_aldc_w, "wrong bc");
 128   ResourceMark rm(thread);
 129   methodHandle m (thread, method(thread));
 130   Bytecode_loadconstant ldc(m, bci(thread));
 131   oop result = ldc.resolve_constant(CHECK);
 132 #ifdef ASSERT
 133   {
 134     // The bytecode wrappers aren't GC-safe so construct a new one
 135     Bytecode_loadconstant ldc2(m, bci(thread));
 136     oop coop = m->constants()->resolved_references()->obj_at(ldc2.cache_index());
 137     assert(result == coop, "expected result for assembly code");
 138   }
 139 #endif
 140   thread->set_vm_result(result);
 141 }
 142 IRT_END
 143 
 144 
 145 //------------------------------------------------------------------------------------------------------------------------
 146 // Allocation
 147 
 148 IRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* thread, ConstantPool* pool, int index))
 149   Klass* k_oop = pool->klass_at(index, CHECK);
 150   instanceKlassHandle klass (THREAD, k_oop);
 151 
 152   // Make sure we are not instantiating an abstract klass
 153   klass->check_valid_for_instantiation(true, CHECK);
 154 
 155   // Make sure klass is initialized
 156   klass->initialize(CHECK);
 157 
 158   // At this point the class may not be fully initialized
 159   // because of recursive initialization. If it is fully
 160   // initialized & has_finalized is not set, we rewrite
 161   // it into its fast version (Note: no locking is needed
 162   // here since this is an atomic byte write and can be
 163   // done more than once).
 164   //
 165   // Note: In case of classes with has_finalized we don't
 166   //       rewrite since that saves us an extra check in
 167   //       the fast version which then would call the
 168   //       slow version anyway (and do a call back into
 169   //       Java).
 170   //       If we have a breakpoint, then we don't rewrite
 171   //       because the _breakpoint bytecode would be lost.
 172   oop obj = klass->allocate_instance(CHECK);
 173   thread->set_vm_result(obj);
 174 IRT_END
 175 
 176 
 177 IRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* thread, BasicType type, jint size))
 178   oop obj = oopFactory::new_typeArray(type, size, CHECK);
 179   thread->set_vm_result(obj);
 180 IRT_END
 181 
 182 
 183 IRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* thread, ConstantPool* pool, int index, jint size))
 184   // Note: no oopHandle for pool & klass needed since they are not used
 185   //       anymore after new_objArray() and no GC can happen before.
 186   //       (This may have to change if this code changes!)
 187   Klass*    klass = pool->klass_at(index, CHECK);
 188   objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
 189   thread->set_vm_result(obj);
 190 IRT_END
 191 
 192 
 193 IRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* thread, jint* first_size_address))
 194   // We may want to pass in more arguments - could make this slightly faster
 195   ConstantPool* constants = method(thread)->constants();
 196   int          i = get_index_u2(thread, Bytecodes::_multianewarray);
 197   Klass* klass = constants->klass_at(i, CHECK);
 198   int   nof_dims = number_of_dimensions(thread);
 199   assert(klass->is_klass(), "not a class");
 200   assert(nof_dims >= 1, "multianewarray rank must be nonzero");
 201 
 202   // We must create an array of jints to pass to multi_allocate.
 203   ResourceMark rm(thread);
 204   const int small_dims = 10;
 205   jint dim_array[small_dims];
 206   jint *dims = &dim_array[0];
 207   if (nof_dims > small_dims) {
 208     dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
 209   }
 210   for (int index = 0; index < nof_dims; index++) {
 211     // offset from first_size_address is addressed as local[index]
 212     int n = Interpreter::local_offset_in_bytes(index)/jintSize;
 213     dims[index] = first_size_address[n];
 214   }
 215   oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
 216   thread->set_vm_result(obj);
 217 IRT_END
 218 
 219 
 220 IRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))
 221   assert(obj->is_oop(), "must be a valid oop");
 222   assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
 223   InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
 224 IRT_END
 225 
 226 
 227 // Quicken instance-of and check-cast bytecodes
 228 IRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* thread))
 229   // Force resolving; quicken the bytecode
 230   int which = get_index_u2(thread, Bytecodes::_checkcast);
 231   ConstantPool* cpool = method(thread)->constants();
 232   // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
 233   // program we might have seen an unquick'd bytecode in the interpreter but have another
 234   // thread quicken the bytecode before we get here.
 235   // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
 236   Klass* klass = cpool->klass_at(which, CHECK);
 237   thread->set_vm_result_2(klass);
 238 IRT_END
 239 
 240 
 241 //------------------------------------------------------------------------------------------------------------------------
 242 // Exceptions
 243 
 244 // Assume the compiler is (or will be) interested in this event.
 245 // If necessary, create an MDO to hold the information, and record it.
 246 void InterpreterRuntime::note_trap(JavaThread* thread, int reason, TRAPS) {
 247   assert(ProfileTraps, "call me only if profiling");
 248   methodHandle trap_method(thread, method(thread));
 249 
 250   if (trap_method.not_null()) {
 251     MethodData* trap_mdo = trap_method->method_data();
 252     if (trap_mdo == NULL) {
 253       Method::build_interpreter_method_data(trap_method, THREAD);
 254       if (HAS_PENDING_EXCEPTION) {
 255         assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
 256         CLEAR_PENDING_EXCEPTION;
 257       }
 258       trap_mdo = trap_method->method_data();
 259       // and fall through...
 260     }
 261     if (trap_mdo != NULL) {
 262       // Update per-method count of trap events.  The interpreter
 263       // is updating the MDO to simulate the effect of compiler traps.
 264       int trap_bci = trap_method->bci_from(bcp(thread));
 265       Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
 266     }
 267   }
 268 }
 269 
 270 static Handle get_preinitialized_exception(Klass* k, TRAPS) {
 271   // get klass
 272   InstanceKlass* klass = InstanceKlass::cast(k);
 273   assert(klass->is_initialized(),
 274          "this klass should have been initialized during VM initialization");
 275   // create instance - do not call constructor since we may have no
 276   // (java) stack space left (should assert constructor is empty)
 277   Handle exception;
 278   oop exception_oop = klass->allocate_instance(CHECK_(exception));
 279   exception = Handle(THREAD, exception_oop);
 280   if (StackTraceInThrowable) {
 281     java_lang_Throwable::fill_in_stack_trace(exception);
 282   }
 283   return exception;
 284 }
 285 
 286 // Special handling for stack overflow: since we don't have any (java) stack
 287 // space left we use the pre-allocated & pre-initialized StackOverflowError
 288 // klass to create an stack overflow error instance.  We do not call its
 289 // constructor for the same reason (it is empty, anyway).
 290 IRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* thread))
 291   Handle exception = get_preinitialized_exception(
 292                                  SystemDictionary::StackOverflowError_klass(),
 293                                  CHECK);
 294   THROW_HANDLE(exception);
 295 IRT_END
 296 
 297 
 298 IRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* thread, char* name, char* message))
 299   // lookup exception klass
 300   TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
 301   if (ProfileTraps) {
 302     if (s == vmSymbols::java_lang_ArithmeticException()) {
 303       note_trap(thread, Deoptimization::Reason_div0_check, CHECK);
 304     } else if (s == vmSymbols::java_lang_NullPointerException()) {
 305       note_trap(thread, Deoptimization::Reason_null_check, CHECK);
 306     }
 307   }
 308   // create exception
 309   Handle exception = Exceptions::new_exception(thread, s, message);
 310   thread->set_vm_result(exception());
 311 IRT_END
 312 
 313 
 314 IRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* thread, char* name, oopDesc* obj))
 315   ResourceMark rm(thread);
 316   const char* klass_name = obj->klass()->external_name();
 317   // lookup exception klass
 318   TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
 319   if (ProfileTraps) {
 320     note_trap(thread, Deoptimization::Reason_class_check, CHECK);
 321   }
 322   // create exception, with klass name as detail message
 323   Handle exception = Exceptions::new_exception(thread, s, klass_name);
 324   thread->set_vm_result(exception());
 325 IRT_END
 326 
 327 
 328 IRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* thread, char* name, jint index))
 329   char message[jintAsStringSize];
 330   // lookup exception klass
 331   TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
 332   if (ProfileTraps) {
 333     note_trap(thread, Deoptimization::Reason_range_check, CHECK);
 334   }
 335   // create exception
 336   sprintf(message, "%d", index);
 337   THROW_MSG(s, message);
 338 IRT_END
 339 
 340 IRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
 341   JavaThread* thread, oopDesc* obj))
 342 
 343   ResourceMark rm(thread);
 344   char* message = SharedRuntime::generate_class_cast_message(
 345     thread, obj->klass()->external_name());
 346 
 347   if (ProfileTraps) {
 348     note_trap(thread, Deoptimization::Reason_class_check, CHECK);
 349   }
 350 
 351   // create exception
 352   THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
 353 IRT_END
 354 
 355 // exception_handler_for_exception(...) returns the continuation address,
 356 // the exception oop (via TLS) and sets the bci/bcp for the continuation.
 357 // The exception oop is returned to make sure it is preserved over GC (it
 358 // is only on the stack if the exception was thrown explicitly via athrow).
 359 // During this operation, the expression stack contains the values for the
 360 // bci where the exception happened. If the exception was propagated back
 361 // from a call, the expression stack contains the values for the bci at the
 362 // invoke w/o arguments (i.e., as if one were inside the call).
 363 IRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* thread, oopDesc* exception))
 364 
 365   Handle             h_exception(thread, exception);
 366   methodHandle       h_method   (thread, method(thread));
 367   constantPoolHandle h_constants(thread, h_method->constants());
 368   bool               should_repeat;
 369   int                handler_bci;
 370   int                current_bci = bci(thread);
 371 
 372   // Need to do this check first since when _do_not_unlock_if_synchronized
 373   // is set, we don't want to trigger any classloading which may make calls
 374   // into java, or surprisingly find a matching exception handler for bci 0
 375   // since at this moment the method hasn't been "officially" entered yet.
 376   if (thread->do_not_unlock_if_synchronized()) {
 377     ResourceMark rm;
 378     assert(current_bci == 0,  "bci isn't zero for do_not_unlock_if_synchronized");
 379     thread->set_vm_result(exception);
 380 #ifdef CC_INTERP
 381     return (address) -1;
 382 #else
 383     return Interpreter::remove_activation_entry();
 384 #endif
 385   }
 386 
 387   do {
 388     should_repeat = false;
 389 
 390     // assertions
 391 #ifdef ASSERT
 392     assert(h_exception.not_null(), "NULL exceptions should be handled by athrow");
 393     assert(h_exception->is_oop(), "just checking");
 394     // Check that exception is a subclass of Throwable, otherwise we have a VerifyError
 395     if (!(h_exception->is_a(SystemDictionary::Throwable_klass()))) {
 396       if (ExitVMOnVerifyError) vm_exit(-1);
 397       ShouldNotReachHere();
 398     }
 399 #endif
 400 
 401     // tracing
 402     if (TraceExceptions) {
 403       ttyLocker ttyl;
 404       ResourceMark rm(thread);
 405       tty->print_cr("Exception <%s> (" INTPTR_FORMAT ")", h_exception->print_value_string(), (address)h_exception());
 406       tty->print_cr(" thrown in interpreter method <%s>", h_method->print_value_string());
 407       tty->print_cr(" at bci %d for thread " INTPTR_FORMAT, current_bci, thread);
 408     }
 409 // Don't go paging in something which won't be used.
 410 //     else if (extable->length() == 0) {
 411 //       // disabled for now - interpreter is not using shortcut yet
 412 //       // (shortcut is not to call runtime if we have no exception handlers)
 413 //       // warning("performance bug: should not call runtime if method has no exception handlers");
 414 //     }
 415     // for AbortVMOnException flag
 416     NOT_PRODUCT(Exceptions::debug_check_abort(h_exception));
 417 
 418     // exception handler lookup
 419     KlassHandle h_klass(THREAD, h_exception->klass());
 420     handler_bci = Method::fast_exception_handler_bci_for(h_method, h_klass, current_bci, THREAD);
 421     if (HAS_PENDING_EXCEPTION) {
 422       // We threw an exception while trying to find the exception handler.
 423       // Transfer the new exception to the exception handle which will
 424       // be set into thread local storage, and do another lookup for an
 425       // exception handler for this exception, this time starting at the
 426       // BCI of the exception handler which caused the exception to be
 427       // thrown (bug 4307310).
 428       h_exception = Handle(THREAD, PENDING_EXCEPTION);
 429       CLEAR_PENDING_EXCEPTION;
 430       if (handler_bci >= 0) {
 431         current_bci = handler_bci;
 432         should_repeat = true;
 433       }
 434     }
 435   } while (should_repeat == true);
 436 
 437   // notify JVMTI of an exception throw; JVMTI will detect if this is a first
 438   // time throw or a stack unwinding throw and accordingly notify the debugger
 439   if (JvmtiExport::can_post_on_exceptions()) {
 440     JvmtiExport::post_exception_throw(thread, h_method(), bcp(thread), h_exception());
 441   }
 442 
 443 #ifdef CC_INTERP
 444   address continuation = (address)(intptr_t) handler_bci;
 445 #else
 446   address continuation = NULL;
 447 #endif
 448   address handler_pc = NULL;
 449   if (handler_bci < 0 || !thread->reguard_stack((address) &continuation)) {
 450     // Forward exception to callee (leaving bci/bcp untouched) because (a) no
 451     // handler in this method, or (b) after a stack overflow there is not yet
 452     // enough stack space available to reprotect the stack.
 453 #ifndef CC_INTERP
 454     continuation = Interpreter::remove_activation_entry();
 455 #endif
 456     // Count this for compilation purposes
 457     h_method->interpreter_throwout_increment(THREAD);
 458   } else {
 459     // handler in this method => change bci/bcp to handler bci/bcp and continue there
 460     handler_pc = h_method->code_base() + handler_bci;
 461 #ifndef CC_INTERP
 462     set_bcp_and_mdp(handler_pc, thread);
 463     continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
 464 #endif
 465   }
 466   // notify debugger of an exception catch
 467   // (this is good for exceptions caught in native methods as well)
 468   if (JvmtiExport::can_post_on_exceptions()) {
 469     JvmtiExport::notice_unwind_due_to_exception(thread, h_method(), handler_pc, h_exception(), (handler_pc != NULL));
 470   }
 471 
 472   thread->set_vm_result(h_exception());
 473   return continuation;
 474 IRT_END
 475 
 476 
 477 IRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* thread))
 478   assert(thread->has_pending_exception(), "must only ne called if there's an exception pending");
 479   // nothing to do - eventually we should remove this code entirely (see comments @ call sites)
 480 IRT_END
 481 
 482 
 483 IRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* thread))
 484   THROW(vmSymbols::java_lang_AbstractMethodError());
 485 IRT_END
 486 
 487 
 488 IRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))
 489   THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
 490 IRT_END
 491 
 492 
 493 //------------------------------------------------------------------------------------------------------------------------
 494 // Fields
 495 //
 496 
 497 IRT_ENTRY(void, InterpreterRuntime::resolve_get_put(JavaThread* thread, Bytecodes::Code bytecode))
 498   // resolve field
 499   FieldAccessInfo info;
 500   constantPoolHandle pool(thread, method(thread)->constants());
 501   bool is_put    = (bytecode == Bytecodes::_putfield  || bytecode == Bytecodes::_putstatic);
 502   bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
 503 
 504   {
 505     JvmtiHideSingleStepping jhss(thread);
 506     LinkResolver::resolve_field(info, pool, get_index_u2_cpcache(thread, bytecode),
 507                                 bytecode, false, CHECK);
 508   } // end JvmtiHideSingleStepping
 509 
 510   // check if link resolution caused cpCache to be updated
 511   if (already_resolved(thread)) return;
 512 
 513   // compute auxiliary field attributes
 514   TosState state  = as_TosState(info.field_type());
 515 
 516   // We need to delay resolving put instructions on final fields
 517   // until we actually invoke one. This is required so we throw
 518   // exceptions at the correct place. If we do not resolve completely
 519   // in the current pass, leaving the put_code set to zero will
 520   // cause the next put instruction to reresolve.
 521   Bytecodes::Code put_code = (Bytecodes::Code)0;
 522 
 523   // We also need to delay resolving getstatic instructions until the
 524   // class is intitialized.  This is required so that access to the static
 525   // field will call the initialization function every time until the class
 526   // is completely initialized ala. in 2.17.5 in JVM Specification.
 527   InstanceKlass *klass = InstanceKlass::cast(info.klass()());
 528   bool uninitialized_static = ((bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic) &&
 529                                !klass->is_initialized());
 530   Bytecodes::Code get_code = (Bytecodes::Code)0;
 531 
 532   if (!uninitialized_static) {
 533     get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield);
 534     if (is_put || !info.access_flags().is_final()) {
 535       put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
 536     }
 537   }
 538 
 539   cache_entry(thread)->set_field(
 540     get_code,
 541     put_code,
 542     info.klass(),
 543     info.field_index(),
 544     info.field_offset(),
 545     state,
 546     info.access_flags().is_final(),
 547     info.access_flags().is_volatile(),
 548     pool->pool_holder()
 549   );
 550 IRT_END
 551 
 552 
 553 //------------------------------------------------------------------------------------------------------------------------
 554 // Synchronization
 555 //
 556 // The interpreter's synchronization code is factored out so that it can
 557 // be shared by method invocation and synchronized blocks.
 558 //%note synchronization_3
 559 
 560 //%note monitor_1
 561 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* thread, BasicObjectLock* elem))
 562 #ifdef ASSERT
 563   thread->last_frame().interpreter_frame_verify_monitor(elem);
 564 #endif
 565   if (PrintBiasedLockingStatistics) {
 566     Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
 567   }
 568   Handle h_obj(thread, elem->obj());
 569   assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
 570          "must be NULL or an object");
 571   if (UseBiasedLocking) {
 572     // Retry fast entry if bias is revoked to avoid unnecessary inflation
 573     ObjectSynchronizer::fast_enter(h_obj, elem->lock(), true, CHECK);
 574   } else {
 575     ObjectSynchronizer::slow_enter(h_obj, elem->lock(), CHECK);
 576   }
 577   assert(Universe::heap()->is_in_reserved_or_null(elem->obj()),
 578          "must be NULL or an object");
 579 #ifdef ASSERT
 580   thread->last_frame().interpreter_frame_verify_monitor(elem);
 581 #endif
 582 IRT_END
 583 
 584 
 585 //%note monitor_1
 586 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorexit(JavaThread* thread, BasicObjectLock* elem))
 587 #ifdef ASSERT
 588   thread->last_frame().interpreter_frame_verify_monitor(elem);
 589 #endif
 590   Handle h_obj(thread, elem->obj());
 591   assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
 592          "must be NULL or an object");
 593   if (elem == NULL || h_obj()->is_unlocked()) {
 594     THROW(vmSymbols::java_lang_IllegalMonitorStateException());
 595   }
 596   ObjectSynchronizer::slow_exit(h_obj(), elem->lock(), thread);
 597   // Free entry. This must be done here, since a pending exception might be installed on
 598   // exit. If it is not cleared, the exception handling code will try to unlock the monitor again.
 599   elem->set_obj(NULL);
 600 #ifdef ASSERT
 601   thread->last_frame().interpreter_frame_verify_monitor(elem);
 602 #endif
 603 IRT_END
 604 
 605 
 606 IRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* thread))
 607   THROW(vmSymbols::java_lang_IllegalMonitorStateException());
 608 IRT_END
 609 
 610 
 611 IRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* thread))
 612   // Returns an illegal exception to install into the current thread. The
 613   // pending_exception flag is cleared so normal exception handling does not
 614   // trigger. Any current installed exception will be overwritten. This
 615   // method will be called during an exception unwind.
 616 
 617   assert(!HAS_PENDING_EXCEPTION, "no pending exception");
 618   Handle exception(thread, thread->vm_result());
 619   assert(exception() != NULL, "vm result should be set");
 620   thread->set_vm_result(NULL); // clear vm result before continuing (may cause memory leaks and assert failures)
 621   if (!exception->is_a(SystemDictionary::ThreadDeath_klass())) {
 622     exception = get_preinitialized_exception(
 623                        SystemDictionary::IllegalMonitorStateException_klass(),
 624                        CATCH);
 625   }
 626   thread->set_vm_result(exception());
 627 IRT_END
 628 
 629 
 630 //------------------------------------------------------------------------------------------------------------------------
 631 // Invokes
 632 
 633 IRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* thread, Method* method, address bcp))
 634   return method->orig_bytecode_at(method->bci_from(bcp));
 635 IRT_END
 636 
 637 IRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* thread, Method* method, address bcp, Bytecodes::Code new_code))
 638   method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
 639 IRT_END
 640 
 641 IRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* thread, Method* method, address bcp))
 642   JvmtiExport::post_raw_breakpoint(thread, method, bcp);
 643 IRT_END
 644 
 645 IRT_ENTRY(void, InterpreterRuntime::resolve_invoke(JavaThread* thread, Bytecodes::Code bytecode)) {
 646   // extract receiver from the outgoing argument list if necessary
 647   Handle receiver(thread, NULL);
 648   if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface) {
 649     ResourceMark rm(thread);
 650     methodHandle m (thread, method(thread));
 651     Bytecode_invoke call(m, bci(thread));
 652     Symbol* signature = call.signature();
 653     receiver = Handle(thread,
 654                   thread->last_frame().interpreter_callee_receiver(signature));
 655     assert(Universe::heap()->is_in_reserved_or_null(receiver()),
 656            "sanity check");
 657     assert(receiver.is_null() ||
 658            !Universe::heap()->is_in_reserved(receiver->klass()),
 659            "sanity check");
 660   }
 661 
 662   // resolve method
 663   CallInfo info;
 664   constantPoolHandle pool(thread, method(thread)->constants());
 665 
 666   {
 667     JvmtiHideSingleStepping jhss(thread);
 668     LinkResolver::resolve_invoke(info, receiver, pool,
 669                                  get_index_u2_cpcache(thread, bytecode), bytecode, CHECK);
 670     if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
 671       int retry_count = 0;
 672       while (info.resolved_method()->is_old()) {
 673         // It is very unlikely that method is redefined more than 100 times
 674         // in the middle of resolve. If it is looping here more than 100 times
 675         // means then there could be a bug here.
 676         guarantee((retry_count++ < 100),
 677                   "Could not resolve to latest version of redefined method");
 678         // method is redefined in the middle of resolve so re-try.
 679         LinkResolver::resolve_invoke(info, receiver, pool,
 680                                      get_index_u2_cpcache(thread, bytecode), bytecode, CHECK);
 681       }
 682     }
 683   } // end JvmtiHideSingleStepping
 684 
 685   // check if link resolution caused cpCache to be updated
 686   if (already_resolved(thread)) return;
 687 
 688   if (bytecode == Bytecodes::_invokeinterface) {
 689 
 690     if (TraceItables && Verbose) {
 691       ResourceMark rm(thread);
 692       tty->print_cr("Resolving: klass: %s to method: %s", info.resolved_klass()->name()->as_C_string(), info.resolved_method()->name()->as_C_string());
 693     }
 694     if (info.resolved_method()->method_holder() ==
 695                                             SystemDictionary::Object_klass()) {
 696       // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
 697       // (see also cpCacheOop.cpp for details)
 698       methodHandle rm = info.resolved_method();
 699       assert(rm->is_final() || info.has_vtable_index(),
 700              "should have been set already");
 701       cache_entry(thread)->set_method(bytecode, rm, info.vtable_index());
 702     } else {
 703       // Setup itable entry
 704       int index = klassItable::compute_itable_index(info.resolved_method()());
 705       cache_entry(thread)->set_interface_call(info.resolved_method(), index);
 706     }
 707   } else {
 708     cache_entry(thread)->set_method(
 709       bytecode,
 710       info.resolved_method(),
 711       info.vtable_index());
 712   }
 713 }
 714 IRT_END
 715 
 716 
 717 // First time execution:  Resolve symbols, create a permanent MethodType object.
 718 IRT_ENTRY(void, InterpreterRuntime::resolve_invokehandle(JavaThread* thread)) {
 719   assert(EnableInvokeDynamic, "");
 720   const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
 721 
 722   // resolve method
 723   CallInfo info;
 724   constantPoolHandle pool(thread, method(thread)->constants());
 725 
 726   {
 727     JvmtiHideSingleStepping jhss(thread);
 728     LinkResolver::resolve_invoke(info, Handle(), pool,
 729                                  get_index_u2_cpcache(thread, bytecode), bytecode, CHECK);
 730   } // end JvmtiHideSingleStepping
 731 
 732   cache_entry(thread)->set_method_handle(pool, info);
 733 }
 734 IRT_END
 735 
 736 
 737 // First time execution:  Resolve symbols, create a permanent CallSite object.
 738 IRT_ENTRY(void, InterpreterRuntime::resolve_invokedynamic(JavaThread* thread)) {
 739   assert(EnableInvokeDynamic, "");
 740   const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
 741 
 742   //TO DO: consider passing BCI to Java.
 743   //  int caller_bci = method(thread)->bci_from(bcp(thread));
 744 
 745   // resolve method
 746   CallInfo info;
 747   constantPoolHandle pool(thread, method(thread)->constants());
 748   int index = get_index_u4(thread, bytecode);
 749   {
 750     JvmtiHideSingleStepping jhss(thread);
 751     LinkResolver::resolve_invoke(info, Handle(), pool,
 752                                  index, bytecode, CHECK);
 753   } // end JvmtiHideSingleStepping
 754 
 755   ConstantPoolCacheEntry* cp_cache_entry = pool->invokedynamic_cp_cache_entry_at(index);
 756   cp_cache_entry->set_dynamic_call(pool, info);
 757 }
 758 IRT_END
 759 
 760 
 761 //------------------------------------------------------------------------------------------------------------------------
 762 // Miscellaneous
 763 
 764 
 765 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* thread, address branch_bcp) {
 766   nmethod* nm = frequency_counter_overflow_inner(thread, branch_bcp);
 767   assert(branch_bcp != NULL || nm == NULL, "always returns null for non OSR requests");
 768   if (branch_bcp != NULL && nm != NULL) {
 769     // This was a successful request for an OSR nmethod.  Because
 770     // frequency_counter_overflow_inner ends with a safepoint check,
 771     // nm could have been unloaded so look it up again.  It's unsafe
 772     // to examine nm directly since it might have been freed and used
 773     // for something else.
 774     frame fr = thread->last_frame();
 775     Method* method =  fr.interpreter_frame_method();
 776     int bci = method->bci_from(fr.interpreter_frame_bcp());
 777     nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
 778   }
 779 #ifndef PRODUCT
 780   if (TraceOnStackReplacement) {
 781     if (nm != NULL) {
 782       tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", nm->osr_entry());
 783       nm->print();
 784     }
 785   }
 786 #endif
 787   return nm;
 788 }
 789 
 790 IRT_ENTRY(nmethod*,
 791           InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* thread, address branch_bcp))
 792   // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
 793   // flag, in case this method triggers classloading which will call into Java.
 794   UnlockFlagSaver fs(thread);
 795 
 796   frame fr = thread->last_frame();
 797   assert(fr.is_interpreted_frame(), "must come from interpreter");
 798   methodHandle method(thread, fr.interpreter_frame_method());
 799   const int branch_bci = branch_bcp != NULL ? method->bci_from(branch_bcp) : InvocationEntryBci;
 800   const int bci = branch_bcp != NULL ? method->bci_from(fr.interpreter_frame_bcp()) : InvocationEntryBci;
 801 
 802   assert(!HAS_PENDING_EXCEPTION, "Should not have any exceptions pending");
 803   nmethod* osr_nm = CompilationPolicy::policy()->event(method, method, branch_bci, bci, CompLevel_none, NULL, thread);
 804   assert(!HAS_PENDING_EXCEPTION, "Event handler should not throw any exceptions");
 805 
 806   if (osr_nm != NULL) {
 807     // We may need to do on-stack replacement which requires that no
 808     // monitors in the activation are biased because their
 809     // BasicObjectLocks will need to migrate during OSR. Force
 810     // unbiasing of all monitors in the activation now (even though
 811     // the OSR nmethod might be invalidated) because we don't have a
 812     // safepoint opportunity later once the migration begins.
 813     if (UseBiasedLocking) {
 814       ResourceMark rm;
 815       GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>();
 816       for( BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
 817            kptr < fr.interpreter_frame_monitor_begin();
 818            kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
 819         if( kptr->obj() != NULL ) {
 820           objects_to_revoke->append(Handle(THREAD, kptr->obj()));
 821         }
 822       }
 823       BiasedLocking::revoke(objects_to_revoke);
 824     }
 825   }
 826   return osr_nm;
 827 IRT_END
 828 
 829 IRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp))
 830   assert(ProfileInterpreter, "must be profiling interpreter");
 831   int bci = method->bci_from(cur_bcp);
 832   MethodData* mdo = method->method_data();
 833   if (mdo == NULL)  return 0;
 834   return mdo->bci_to_di(bci);
 835 IRT_END
 836 
 837 IRT_ENTRY(void, InterpreterRuntime::profile_method(JavaThread* thread))
 838   // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
 839   // flag, in case this method triggers classloading which will call into Java.
 840   UnlockFlagSaver fs(thread);
 841 
 842   assert(ProfileInterpreter, "must be profiling interpreter");
 843   frame fr = thread->last_frame();
 844   assert(fr.is_interpreted_frame(), "must come from interpreter");
 845   methodHandle method(thread, fr.interpreter_frame_method());
 846   Method::build_interpreter_method_data(method, THREAD);
 847   if (HAS_PENDING_EXCEPTION) {
 848     assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
 849     CLEAR_PENDING_EXCEPTION;
 850     // and fall through...
 851   }
 852 IRT_END
 853 
 854 
 855 #ifdef ASSERT
 856 IRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp))
 857   assert(ProfileInterpreter, "must be profiling interpreter");
 858 
 859   MethodData* mdo = method->method_data();
 860   assert(mdo != NULL, "must not be null");
 861 
 862   int bci = method->bci_from(bcp);
 863 
 864   address mdp2 = mdo->bci_to_dp(bci);
 865   if (mdp != mdp2) {
 866     ResourceMark rm;
 867     ResetNoHandleMark rnm; // In a LEAF entry.
 868     HandleMark hm;
 869     tty->print_cr("FAILED verify : actual mdp %p   expected mdp %p @ bci %d", mdp, mdp2, bci);
 870     int current_di = mdo->dp_to_di(mdp);
 871     int expected_di  = mdo->dp_to_di(mdp2);
 872     tty->print_cr("  actual di %d   expected di %d", current_di, expected_di);
 873     int expected_approx_bci = mdo->data_at(expected_di)->bci();
 874     int approx_bci = -1;
 875     if (current_di >= 0) {
 876       approx_bci = mdo->data_at(current_di)->bci();
 877     }
 878     tty->print_cr("  actual bci is %d  expected bci %d", approx_bci, expected_approx_bci);
 879     mdo->print_on(tty);
 880     method->print_codes();
 881   }
 882   assert(mdp == mdp2, "wrong mdp");
 883 IRT_END
 884 #endif // ASSERT
 885 
 886 IRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* thread, int return_bci))
 887   assert(ProfileInterpreter, "must be profiling interpreter");
 888   ResourceMark rm(thread);
 889   HandleMark hm(thread);
 890   frame fr = thread->last_frame();
 891   assert(fr.is_interpreted_frame(), "must come from interpreter");
 892   MethodData* h_mdo = fr.interpreter_frame_method()->method_data();
 893 
 894   // Grab a lock to ensure atomic access to setting the return bci and
 895   // the displacement.  This can block and GC, invalidating all naked oops.
 896   MutexLocker ml(RetData_lock);
 897 
 898   // ProfileData is essentially a wrapper around a derived oop, so we
 899   // need to take the lock before making any ProfileData structures.
 900   ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(fr.interpreter_frame_mdp()));
 901   RetData* rdata = data->as_RetData();
 902   address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
 903   fr.interpreter_frame_set_mdp(new_mdp);
 904 IRT_END
 905 
 906 IRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* thread, Method* m))
 907   MethodCounters* mcs = Method::build_method_counters(m, thread);
 908   if (HAS_PENDING_EXCEPTION) {
 909     assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
 910     CLEAR_PENDING_EXCEPTION;
 911   }
 912   return mcs;
 913 IRT_END
 914 
 915 
 916 IRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* thread))
 917   // We used to need an explict preserve_arguments here for invoke bytecodes. However,
 918   // stack traversal automatically takes care of preserving arguments for invoke, so
 919   // this is no longer needed.
 920 
 921   // IRT_END does an implicit safepoint check, hence we are guaranteed to block
 922   // if this is called during a safepoint
 923 
 924   if (JvmtiExport::should_post_single_step()) {
 925     // We are called during regular safepoints and when the VM is
 926     // single stepping. If any thread is marked for single stepping,
 927     // then we may have JVMTI work to do.
 928     JvmtiExport::at_single_stepping_point(thread, method(thread), bcp(thread));
 929   }
 930 IRT_END
 931 
 932 IRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread *thread, oopDesc* obj,
 933 ConstantPoolCacheEntry *cp_entry))
 934 
 935   // check the access_flags for the field in the klass
 936 
 937   InstanceKlass* ik = InstanceKlass::cast(cp_entry->f1_as_klass());
 938   int index = cp_entry->field_index();
 939   if ((ik->field_access_flags(index) & JVM_ACC_FIELD_ACCESS_WATCHED) == 0) return;
 940 
 941   switch(cp_entry->flag_state()) {
 942     case btos:    // fall through
 943     case ctos:    // fall through
 944     case stos:    // fall through
 945     case itos:    // fall through
 946     case ftos:    // fall through
 947     case ltos:    // fall through
 948     case dtos:    // fall through
 949     case atos: break;
 950     default: ShouldNotReachHere(); return;
 951   }
 952   bool is_static = (obj == NULL);
 953   HandleMark hm(thread);
 954 
 955   Handle h_obj;
 956   if (!is_static) {
 957     // non-static field accessors have an object, but we need a handle
 958     h_obj = Handle(thread, obj);
 959   }
 960   instanceKlassHandle h_cp_entry_f1(thread, (Klass*)cp_entry->f1_as_klass());
 961   jfieldID fid = jfieldIDWorkaround::to_jfieldID(h_cp_entry_f1, cp_entry->f2_as_index(), is_static);
 962   JvmtiExport::post_field_access(thread, method(thread), bcp(thread), h_cp_entry_f1, h_obj, fid);
 963 IRT_END
 964 
 965 IRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread *thread,
 966   oopDesc* obj, ConstantPoolCacheEntry *cp_entry, jvalue *value))
 967 
 968   Klass* k = (Klass*)cp_entry->f1_as_klass();
 969 
 970   // check the access_flags for the field in the klass
 971   InstanceKlass* ik = InstanceKlass::cast(k);
 972   int index = cp_entry->field_index();
 973   // bail out if field modifications are not watched
 974   if ((ik->field_access_flags(index) & JVM_ACC_FIELD_MODIFICATION_WATCHED) == 0) return;
 975 
 976   char sig_type = '\0';
 977 
 978   switch(cp_entry->flag_state()) {
 979     case btos: sig_type = 'Z'; break;
 980     case ctos: sig_type = 'C'; break;
 981     case stos: sig_type = 'S'; break;
 982     case itos: sig_type = 'I'; break;
 983     case ftos: sig_type = 'F'; break;
 984     case atos: sig_type = 'L'; break;
 985     case ltos: sig_type = 'J'; break;
 986     case dtos: sig_type = 'D'; break;
 987     default:  ShouldNotReachHere(); return;
 988   }
 989   bool is_static = (obj == NULL);
 990 
 991   HandleMark hm(thread);
 992   instanceKlassHandle h_klass(thread, k);
 993   jfieldID fid = jfieldIDWorkaround::to_jfieldID(h_klass, cp_entry->f2_as_index(), is_static);
 994   jvalue fvalue;
 995 #ifdef _LP64
 996   fvalue = *value;
 997 #else
 998   // Long/double values are stored unaligned and also noncontiguously with
 999   // tagged stacks.  We can't just do a simple assignment even in the non-
1000   // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1001   // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1002   // We assume that the two halves of longs/doubles are stored in interpreter
1003   // stack slots in platform-endian order.
1004   jlong_accessor u;
1005   jint* newval = (jint*)value;
1006   u.words[0] = newval[0];
1007   u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1008   fvalue.j = u.long_value;
1009 #endif // _LP64
1010 
1011   Handle h_obj;
1012   if (!is_static) {
1013     // non-static field accessors have an object, but we need a handle
1014     h_obj = Handle(thread, obj);
1015   }
1016 
1017   JvmtiExport::post_raw_field_modification(thread, method(thread), bcp(thread), h_klass, h_obj,
1018                                            fid, sig_type, &fvalue);
1019 IRT_END
1020 
1021 IRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread *thread))
1022   JvmtiExport::post_method_entry(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread));
1023 IRT_END
1024 
1025 
1026 IRT_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread *thread))
1027   JvmtiExport::post_method_exit(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread));
1028 IRT_END
1029 
1030 IRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1031 {
1032   return (Interpreter::contains(pc) ? 1 : 0);
1033 }
1034 IRT_END
1035 
1036 
1037 // Implementation of SignatureHandlerLibrary
1038 
1039 address SignatureHandlerLibrary::set_handler_blob() {
1040   BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1041   if (handler_blob == NULL) {
1042     return NULL;
1043   }
1044   address handler = handler_blob->code_begin();
1045   _handler_blob = handler_blob;
1046   _handler = handler;
1047   return handler;
1048 }
1049 
1050 void SignatureHandlerLibrary::initialize() {
1051   if (_fingerprints != NULL) {
1052     return;
1053   }
1054   if (set_handler_blob() == NULL) {
1055     vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers");
1056   }
1057 
1058   BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1059                                       SignatureHandlerLibrary::buffer_size);
1060   _buffer = bb->code_begin();
1061 
1062   _fingerprints = new(ResourceObj::C_HEAP, mtCode)GrowableArray<uint64_t>(32, true);
1063   _handlers     = new(ResourceObj::C_HEAP, mtCode)GrowableArray<address>(32, true);
1064 }
1065 
1066 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1067   address handler   = _handler;
1068   int     insts_size = buffer->pure_insts_size();
1069   if (handler + insts_size > _handler_blob->code_end()) {
1070     // get a new handler blob
1071     handler = set_handler_blob();
1072   }
1073   if (handler != NULL) {
1074     memcpy(handler, buffer->insts_begin(), insts_size);
1075     pd_set_handler(handler);
1076     ICache::invalidate_range(handler, insts_size);
1077     _handler = handler + insts_size;
1078   }
1079   return handler;
1080 }
1081 
1082 void SignatureHandlerLibrary::add(methodHandle method) {
1083   if (method->signature_handler() == NULL) {
1084     // use slow signature handler if we can't do better
1085     int handler_index = -1;
1086     // check if we can use customized (fast) signature handler
1087     if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::max_size_of_parameters) {
1088       // use customized signature handler
1089       MutexLocker mu(SignatureHandlerLibrary_lock);
1090       // make sure data structure is initialized
1091       initialize();
1092       // lookup method signature's fingerprint
1093       uint64_t fingerprint = Fingerprinter(method).fingerprint();
1094       handler_index = _fingerprints->find(fingerprint);
1095       // create handler if necessary
1096       if (handler_index < 0) {
1097         ResourceMark rm;
1098         ptrdiff_t align_offset = (address)
1099           round_to((intptr_t)_buffer, CodeEntryAlignment) - (address)_buffer;
1100         CodeBuffer buffer((address)(_buffer + align_offset),
1101                           SignatureHandlerLibrary::buffer_size - align_offset);
1102         InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1103         // copy into code heap
1104         address handler = set_handler(&buffer);
1105         if (handler == NULL) {
1106           // use slow signature handler
1107         } else {
1108           // debugging suppport
1109           if (PrintSignatureHandlers) {
1110             tty->cr();
1111             tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1112                           _handlers->length(),
1113                           (method->is_static() ? "static" : "receiver"),
1114                           method->name_and_sig_as_C_string(),
1115                           fingerprint,
1116                           buffer.insts_size());
1117             Disassembler::decode(handler, handler + buffer.insts_size());
1118 #ifndef PRODUCT
1119             tty->print_cr(" --- associated result handler ---");
1120             address rh_begin = Interpreter::result_handler(method()->result_type());
1121             address rh_end = rh_begin;
1122             while (*(int*)rh_end != 0) {
1123               rh_end += sizeof(int);
1124             }
1125             Disassembler::decode(rh_begin, rh_end);
1126 #endif
1127           }
1128           // add handler to library
1129           _fingerprints->append(fingerprint);
1130           _handlers->append(handler);
1131           // set handler index
1132           assert(_fingerprints->length() == _handlers->length(), "sanity check");
1133           handler_index = _fingerprints->length() - 1;
1134         }
1135       }
1136       // Set handler under SignatureHandlerLibrary_lock
1137     if (handler_index < 0) {
1138       // use generic signature handler
1139       method->set_signature_handler(Interpreter::slow_signature_handler());
1140     } else {
1141       // set handler
1142       method->set_signature_handler(_handlers->at(handler_index));
1143     }
1144     } else {
1145       CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
1146       // use generic signature handler
1147       method->set_signature_handler(Interpreter::slow_signature_handler());
1148     }
1149   }
1150 #ifdef ASSERT
1151   int handler_index = -1;
1152   int fingerprint_index = -2;
1153   {
1154     // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized
1155     // in any way if accessed from multiple threads. To avoid races with another
1156     // thread which may change the arrays in the above, mutex protected block, we
1157     // have to protect this read access here with the same mutex as well!
1158     MutexLocker mu(SignatureHandlerLibrary_lock);
1159     if (_handlers != NULL) {
1160     handler_index = _handlers->find(method->signature_handler());
1161     fingerprint_index = _fingerprints->find(Fingerprinter(method).fingerprint());
1162   }
1163   }
1164   assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1165          handler_index == fingerprint_index, "sanity check");
1166 #endif // ASSERT
1167 }
1168 
1169 
1170 BufferBlob*              SignatureHandlerLibrary::_handler_blob = NULL;
1171 address                  SignatureHandlerLibrary::_handler      = NULL;
1172 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = NULL;
1173 GrowableArray<address>*  SignatureHandlerLibrary::_handlers     = NULL;
1174 address                  SignatureHandlerLibrary::_buffer       = NULL;
1175 
1176 
1177 IRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* thread, Method* method))
1178   methodHandle m(thread, method);
1179   assert(m->is_native(), "sanity check");
1180   // lookup native function entry point if it doesn't exist
1181   bool in_base_library;
1182   if (!m->has_native_function()) {
1183     NativeLookup::lookup(m, in_base_library, CHECK);
1184   }
1185   // make sure signature handler is installed
1186   SignatureHandlerLibrary::add(m);
1187   // The interpreter entry point checks the signature handler first,
1188   // before trying to fetch the native entry point and klass mirror.
1189   // We must set the signature handler last, so that multiple processors
1190   // preparing the same method will be sure to see non-null entry & mirror.
1191 IRT_END
1192 
1193 #if defined(IA32) || defined(AMD64) || defined(ARM)
1194 IRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* thread, void* src_address, void* dest_address))
1195   if (src_address == dest_address) {
1196     return;
1197   }
1198   ResetNoHandleMark rnm; // In a LEAF entry.
1199   HandleMark hm;
1200   ResourceMark rm;
1201   frame fr = thread->last_frame();
1202   assert(fr.is_interpreted_frame(), "");
1203   jint bci = fr.interpreter_frame_bci();
1204   methodHandle mh(thread, fr.interpreter_frame_method());
1205   Bytecode_invoke invoke(mh, bci);
1206   ArgumentSizeComputer asc(invoke.signature());
1207   int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver
1208   Copy::conjoint_jbytes(src_address, dest_address,
1209                        size_of_arguments * Interpreter::stackElementSize);
1210 IRT_END
1211 #endif