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 /*

  * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #include "precompiled.hpp"

 #include "classfile/systemDictionary.hpp"

 #include "classfile/vmSymbols.hpp"

 #include "compiler/compileBroker.hpp"

 #include "gc_interface/collectedHeap.hpp"

 #include "interpreter/interpreter.hpp"

 #include "interpreter/interpreterRuntime.hpp"

 #include "interpreter/linkResolver.hpp"

 #include "interpreter/templateTable.hpp"

 #include "memory/oopFactory.hpp"

 #include "memory/universe.inline.hpp"

 #include "oops/constantPoolOop.hpp"

 #include "oops/cpCacheOop.hpp"

 #include "oops/instanceKlass.hpp"

 #include "oops/methodDataOop.hpp"

 #include "oops/objArrayKlass.hpp"

 #include "oops/oop.inline.hpp"

 #include "oops/symbol.hpp"

 #include "prims/jvmtiExport.hpp"

 #include "prims/nativeLookup.hpp"

 #include "runtime/biasedLocking.hpp"

 #include "runtime/compilationPolicy.hpp"

 #include "runtime/deoptimization.hpp"

 #include "runtime/fieldDescriptor.hpp"

 #include "runtime/handles.inline.hpp"

 #include "runtime/interfaceSupport.hpp"

 #include "runtime/java.hpp"

 #include "runtime/jfieldIDWorkaround.hpp"

 #include "runtime/osThread.hpp"

 #include "runtime/sharedRuntime.hpp"

 #include "runtime/stubRoutines.hpp"

 #include "runtime/synchronizer.hpp"

 #include "runtime/threadCritical.hpp"

 #include "utilities/events.hpp"

 #ifdef TARGET_ARCH_x86

 # include "vm_version_x86.hpp"

 #endif

 #ifdef TARGET_ARCH_sparc

 # include "vm_version_sparc.hpp"

 #endif

 #ifdef TARGET_ARCH_zero

 # include "vm_version_zero.hpp"

 #endif

 #ifdef TARGET_ARCH_arm

 # include "vm_version_arm.hpp"

 #endif

 #ifdef TARGET_ARCH_ppc

 # include "vm_version_ppc.hpp"

 #endif

 #ifdef COMPILER2

 #include "opto/runtime.hpp"

 #endif

 class UnlockFlagSaver {

   private:

     JavaThread* _thread;

     bool _do_not_unlock;

   public:

     UnlockFlagSaver(JavaThread* t) {

       _thread = t;

       _do_not_unlock = t->do_not_unlock_if_synchronized();

       t->set_do_not_unlock_if_synchronized(false);

     }

     ~UnlockFlagSaver() {

       _thread->set_do_not_unlock_if_synchronized(_do_not_unlock);

     }

 };

 //------------------------------------------------------------------------------------------------------------------------

 // State accessors

 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread *thread) {

   last_frame(thread).interpreter_frame_set_bcp(bcp);

   if (ProfileInterpreter) {

     // ProfileTraps uses MDOs independently of ProfileInterpreter.

     // That is why we must check both ProfileInterpreter and mdo != NULL.

     methodDataOop mdo = last_frame(thread).interpreter_frame_method()->method_data();

     if (mdo != NULL) {

       NEEDS_CLEANUP;

       last_frame(thread).interpreter_frame_set_mdp(mdo->bci_to_dp(last_frame(thread).interpreter_frame_bci()));

     }

   }

 }

 //------------------------------------------------------------------------------------------------------------------------

 // Constants

 IRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* thread, bool wide))

   // access constant pool

   constantPoolOop pool = method(thread)->constants();

   int index = wide ? get_index_u2(thread, Bytecodes::_ldc_w) : get_index_u1(thread, Bytecodes::_ldc);

   constantTag tag = pool->tag_at(index);

   if (tag.is_unresolved_klass() || tag.is_klass()) {

     klassOop klass = pool->klass_at(index, CHECK);

     oop java_class = klass->java_mirror();

     thread->set_vm_result(java_class);

   } else {

 #ifdef ASSERT

     // If we entered this runtime routine, we believed the tag contained

     // an unresolved string, an unresolved class or a resolved class.

     // However, another thread could have resolved the unresolved string

     // or class by the time we go there.

     assert(tag.is_unresolved_string()|| tag.is_string(), "expected string");

 #endif

     oop s_oop = pool->string_at(index, CHECK);

     thread->set_vm_result(s_oop);

   }

 IRT_END

 IRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* thread, Bytecodes::Code bytecode)) {

   assert(bytecode == Bytecodes::_fast_aldc ||

          bytecode == Bytecodes::_fast_aldc_w, "wrong bc");

   ResourceMark rm(thread);

   methodHandle m (thread, method(thread));

   Bytecode_loadconstant ldc(m, bci(thread));

   oop result = ldc.resolve_constant(THREAD);

   DEBUG_ONLY(ConstantPoolCacheEntry* cpce = m->constants()->cache()->entry_at(ldc.cache_index()));

   assert(result == cpce->f1(), "expected result for assembly code");

 }

 IRT_END

 //------------------------------------------------------------------------------------------------------------------------

 // Allocation

 IRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* thread, constantPoolOopDesc* pool, int index))

   klassOop k_oop = pool->klass_at(index, CHECK);

   instanceKlassHandle klass (THREAD, k_oop);

   // Make sure we are not instantiating an abstract klass

   klass->check_valid_for_instantiation(true, CHECK);

   // Make sure klass is initialized

   klass->initialize(CHECK);

   // At this point the class may not be fully initialized

   // because of recursive initialization. If it is fully

   // initialized & has_finalized is not set, we rewrite

   // it into its fast version (Note: no locking is needed

   // here since this is an atomic byte write and can be

   // done more than once).

   //

   // Note: In case of classes with has_finalized we don't

   //       rewrite since that saves us an extra check in

   //       the fast version which then would call the

   //       slow version anyway (and do a call back into

   //       Java).

   //       If we have a breakpoint, then we don't rewrite

   //       because the _breakpoint bytecode would be lost.

   oop obj = klass->allocate_instance(CHECK);

   thread->set_vm_result(obj);

 IRT_END

 IRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* thread, BasicType type, jint size))

   oop obj = oopFactory::new_typeArray(type, size, CHECK);

   thread->set_vm_result(obj);

 IRT_END

 IRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* thread, constantPoolOopDesc* pool, int index, jint size))

   // Note: no oopHandle for pool & klass needed since they are not used

   //       anymore after new_objArray() and no GC can happen before.

   //       (This may have to change if this code changes!)

   klassOop  klass = pool->klass_at(index, CHECK);

   objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);

   thread->set_vm_result(obj);

 IRT_END

 IRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* thread, jint* first_size_address))

   // We may want to pass in more arguments - could make this slightly faster

   constantPoolOop constants = method(thread)->constants();

   int          i = get_index_u2(thread, Bytecodes::_multianewarray);

   klassOop klass = constants->klass_at(i, CHECK);

   int   nof_dims = number_of_dimensions(thread);

   assert(oop(klass)->is_klass(), "not a class");

   assert(nof_dims >= 1, "multianewarray rank must be nonzero");

   // We must create an array of jints to pass to multi_allocate.

   ResourceMark rm(thread);

   const int small_dims = 10;

   jint dim_array[small_dims];

   jint *dims = &dim_array[0];

   if (nof_dims > small_dims) {

     dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);

   }

   for (int index = 0; index < nof_dims; index++) {

     // offset from first_size_address is addressed as local[index]

     int n = Interpreter::local_offset_in_bytes(index)/jintSize;

     dims[index] = first_size_address[n];

   }

   oop obj = arrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);

   thread->set_vm_result(obj);

 IRT_END

 IRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))

   assert(obj->is_oop(), "must be a valid oop");

   assert(obj->klass()->klass_part()->has_finalizer(), "shouldn't be here otherwise");

   instanceKlass::register_finalizer(instanceOop(obj), CHECK);

 IRT_END

 // Quicken instance-of and check-cast bytecodes

 IRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* thread))

   // Force resolving; quicken the bytecode

   int which = get_index_u2(thread, Bytecodes::_checkcast);

   constantPoolOop cpool = method(thread)->constants();

   // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded

   // program we might have seen an unquick'd bytecode in the interpreter but have another

   // thread quicken the bytecode before we get here.

   // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );

   klassOop klass = cpool->klass_at(which, CHECK);

   thread->set_vm_result(klass);

 IRT_END

 //------------------------------------------------------------------------------------------------------------------------

 // Exceptions

 // Assume the compiler is (or will be) interested in this event.

 // If necessary, create an MDO to hold the information, and record it.

 void InterpreterRuntime::note_trap(JavaThread* thread, int reason, TRAPS) {

   assert(ProfileTraps, "call me only if profiling");

   methodHandle trap_method(thread, method(thread));

   if (trap_method.not_null()) {

     methodDataHandle trap_mdo(thread, trap_method->method_data());

     if (trap_mdo.is_null()) {

       methodOopDesc::build_interpreter_method_data(trap_method, THREAD);

       if (HAS_PENDING_EXCEPTION) {

         assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");

         CLEAR_PENDING_EXCEPTION;

       }

       trap_mdo = methodDataHandle(thread, trap_method->method_data());

       // and fall through...

     }

     if (trap_mdo.not_null()) {

       // Update per-method count of trap events.  The interpreter

       // is updating the MDO to simulate the effect of compiler traps.

       int trap_bci = trap_method->bci_from(bcp(thread));

       Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);

     }

   }

 }

 static Handle get_preinitialized_exception(klassOop k, TRAPS) {

   // get klass

   instanceKlass* klass = instanceKlass::cast(k);

   assert(klass->is_initialized(),

          "this klass should have been initialized during VM initialization");

   // create instance - do not call constructor since we may have no

   // (java) stack space left (should assert constructor is empty)

   Handle exception;

   oop exception_oop = klass->allocate_instance(CHECK_(exception));

   exception = Handle(THREAD, exception_oop);

   if (StackTraceInThrowable) {

     java_lang_Throwable::fill_in_stack_trace(exception);

   }

   return exception;

 }

 // Special handling for stack overflow: since we don't have any (java) stack

 // space left we use the pre-allocated & pre-initialized StackOverflowError

 // klass to create an stack overflow error instance.  We do not call its

 // constructor for the same reason (it is empty, anyway).

 IRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* thread))

   Handle exception = get_preinitialized_exception(

                                  SystemDictionary::StackOverflowError_klass(),

                                  CHECK);

   THROW_HANDLE(exception);

 IRT_END

 IRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* thread, char* name, char* message))

   // lookup exception klass

   TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);

   if (ProfileTraps) {

     if (s == vmSymbols::java_lang_ArithmeticException()) {

       note_trap(thread, Deoptimization::Reason_div0_check, CHECK);

     } else if (s == vmSymbols::java_lang_NullPointerException()) {

       note_trap(thread, Deoptimization::Reason_null_check, CHECK);

     }

   }

   // create exception

   Handle exception = Exceptions::new_exception(thread, s, message);

   thread->set_vm_result(exception());

 IRT_END

 IRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* thread, char* name, oopDesc* obj))

   ResourceMark rm(thread);

   const char* klass_name = Klass::cast(obj->klass())->external_name();

   // lookup exception klass

   TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);

   if (ProfileTraps) {

     note_trap(thread, Deoptimization::Reason_class_check, CHECK);

   }

   // create exception, with klass name as detail message

   Handle exception = Exceptions::new_exception(thread, s, klass_name);

   thread->set_vm_result(exception());

 IRT_END

 IRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* thread, char* name, jint index))

   char message[jintAsStringSize];

   // lookup exception klass

   TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);

   if (ProfileTraps) {

     note_trap(thread, Deoptimization::Reason_range_check, CHECK);

   }

   // create exception

   sprintf(message, "%d", index);

   THROW_MSG(s, message);

 IRT_END

 IRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(

   JavaThread* thread, oopDesc* obj))

   ResourceMark rm(thread);

   char* message = SharedRuntime::generate_class_cast_message(

     thread, Klass::cast(obj->klass())->external_name());

   if (ProfileTraps) {

     note_trap(thread, Deoptimization::Reason_class_check, CHECK);

   }

   // create exception

   THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);

 IRT_END

 // required can be either a MethodType, or a Class (for a single argument)

 // actual (if not null) can be either a MethodHandle, or an arbitrary value (for a single argument)

 IRT_ENTRY(void, InterpreterRuntime::throw_WrongMethodTypeException(JavaThread* thread,

                                                                    oopDesc* required,

                                                                    oopDesc* actual)) {

   ResourceMark rm(thread);

   char* message = SharedRuntime::generate_wrong_method_type_message(thread, required, actual);

   if (ProfileTraps) {

     note_trap(thread, Deoptimization::Reason_constraint, CHECK);

   }

   // create exception

   THROW_MSG(vmSymbols::java_lang_invoke_WrongMethodTypeException(), message);

 }

 IRT_END

 // exception_handler_for_exception(...) returns the continuation address,

 // the exception oop (via TLS) and sets the bci/bcp for the continuation.

 // The exception oop is returned to make sure it is preserved over GC (it

 // is only on the stack if the exception was thrown explicitly via athrow).

 // During this operation, the expression stack contains the values for the

 // bci where the exception happened. If the exception was propagated back

 // from a call, the expression stack contains the values for the bci at the

 // invoke w/o arguments (i.e., as if one were inside the call).

 IRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* thread, oopDesc* exception))

   Handle             h_exception(thread, exception);

   methodHandle       h_method   (thread, method(thread));

   constantPoolHandle h_constants(thread, h_method->constants());

   typeArrayHandle    h_extable  (thread, h_method->exception_table());

   bool               should_repeat;

   int                handler_bci;

   int                current_bci = bci(thread);

   // Need to do this check first since when _do_not_unlock_if_synchronized

   // is set, we don't want to trigger any classloading which may make calls

   // into java, or surprisingly find a matching exception handler for bci 0

   // since at this moment the method hasn't been "officially" entered yet.

   if (thread->do_not_unlock_if_synchronized()) {

     ResourceMark rm;

     assert(current_bci == 0,  "bci isn't zero for do_not_unlock_if_synchronized");

     thread->set_vm_result(exception);

 #ifdef CC_INTERP

     return (address) -1;

 #else

     return Interpreter::remove_activation_entry();

 #endif

   }

   do {

     should_repeat = false;

     // assertions

 #ifdef ASSERT

     assert(h_exception.not_null(), "NULL exceptions should be handled by athrow");

     assert(h_exception->is_oop(), "just checking");

     // Check that exception is a subclass of Throwable, otherwise we have a VerifyError

     if (!(h_exception->is_a(SystemDictionary::Throwable_klass()))) {

       if (ExitVMOnVerifyError) vm_exit(-1);

       ShouldNotReachHere();

     }

 #endif

     // tracing

     if (TraceExceptions) {

       ttyLocker ttyl;

       ResourceMark rm(thread);

       tty->print_cr("Exception <%s> (" INTPTR_FORMAT ")", h_exception->print_value_string(), (address)h_exception());

       tty->print_cr(" thrown in interpreter method <%s>", h_method->print_value_string());

       tty->print_cr(" at bci %d for thread " INTPTR_FORMAT, current_bci, thread);

     }

 // Don't go paging in something which won't be used.

 //     else if (h_extable->length() == 0) {

 //       // disabled for now - interpreter is not using shortcut yet

 //       // (shortcut is not to call runtime if we have no exception handlers)

 //       // warning("performance bug: should not call runtime if method has no exception handlers");

 //     }

     // for AbortVMOnException flag

     NOT_PRODUCT(Exceptions::debug_check_abort(h_exception));

     // exception handler lookup

     KlassHandle h_klass(THREAD, h_exception->klass());

     handler_bci = h_method->fast_exception_handler_bci_for(h_klass, current_bci, THREAD);

     if (HAS_PENDING_EXCEPTION) {

       // We threw an exception while trying to find the exception handler.

       // Transfer the new exception to the exception handle which will

       // be set into thread local storage, and do another lookup for an

       // exception handler for this exception, this time starting at the

       // BCI of the exception handler which caused the exception to be

       // thrown (bug 4307310).

       h_exception = Handle(THREAD, PENDING_EXCEPTION);

       CLEAR_PENDING_EXCEPTION;

       if (handler_bci >= 0) {

         current_bci = handler_bci;

         should_repeat = true;

       }

     }

   } while (should_repeat == true);

   // notify JVMTI of an exception throw; JVMTI will detect if this is a first

   // time throw or a stack unwinding throw and accordingly notify the debugger

   if (JvmtiExport::can_post_on_exceptions()) {

     JvmtiExport::post_exception_throw(thread, h_method(), bcp(thread), h_exception());

   }

 #ifdef CC_INTERP

   address continuation = (address)(intptr_t) handler_bci;

 #else

   address continuation = NULL;

 #endif

   address handler_pc = NULL;

   if (handler_bci < 0 || !thread->reguard_stack((address) &continuation)) {

     // Forward exception to callee (leaving bci/bcp untouched) because (a) no

     // handler in this method, or (b) after a stack overflow there is not yet

     // enough stack space available to reprotect the stack.

 #ifndef CC_INTERP

     continuation = Interpreter::remove_activation_entry();

 #endif

     // Count this for compilation purposes

     h_method->interpreter_throwout_increment();

   } else {

     // handler in this method => change bci/bcp to handler bci/bcp and continue there

     handler_pc = h_method->code_base() + handler_bci;

 #ifndef CC_INTERP

     set_bcp_and_mdp(handler_pc, thread);

     continuation = Interpreter::dispatch_table(vtos)[*handler_pc];

 #endif

   }

   // notify debugger of an exception catch

   // (this is good for exceptions caught in native methods as well)

   if (JvmtiExport::can_post_on_exceptions()) {

     JvmtiExport::notice_unwind_due_to_exception(thread, h_method(), handler_pc, h_exception(), (handler_pc != NULL));

   }

   thread->set_vm_result(h_exception());

   return continuation;

 IRT_END

 IRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* thread))

   assert(thread->has_pending_exception(), "must only ne called if there's an exception pending");

   // nothing to do - eventually we should remove this code entirely (see comments @ call sites)

 IRT_END

 IRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* thread))

   THROW(vmSymbols::java_lang_AbstractMethodError());

 IRT_END

 IRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))

   THROW(vmSymbols::java_lang_IncompatibleClassChangeError());

 IRT_END

 //------------------------------------------------------------------------------------------------------------------------

 // Fields

 //

 IRT_ENTRY(void, InterpreterRuntime::resolve_get_put(JavaThread* thread, Bytecodes::Code bytecode))

   // resolve field

   FieldAccessInfo info;

   constantPoolHandle pool(thread, method(thread)->constants());

   bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);

   {

     JvmtiHideSingleStepping jhss(thread);

     LinkResolver::resolve_field(info, pool, get_index_u2_cpcache(thread, bytecode),

                                 bytecode, false, CHECK);

   } // end JvmtiHideSingleStepping

   // check if link resolution caused cpCache to be updated

   if (already_resolved(thread)) return;

   // compute auxiliary field attributes

   TosState state  = as_TosState(info.field_type());

   // We need to delay resolving put instructions on final fields

   // until we actually invoke one. This is required so we throw

   // exceptions at the correct place. If we do not resolve completely

   // in the current pass, leaving the put_code set to zero will

   // cause the next put instruction to reresolve.

   bool is_put = (bytecode == Bytecodes::_putfield ||

                  bytecode == Bytecodes::_putstatic);

   Bytecodes::Code put_code = (Bytecodes::Code)0;

   // We also need to delay resolving getstatic instructions until the

   // class is intitialized.  This is required so that access to the static

   // field will call the initialization function every time until the class

   // is completely initialized ala. in 2.17.5 in JVM Specification.

   instanceKlass *klass = instanceKlass::cast(info.klass()->as_klassOop());

   bool uninitialized_static = ((bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic) &&

                                !klass->is_initialized());

   Bytecodes::Code get_code = (Bytecodes::Code)0;

   if (!uninitialized_static) {

     get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield);

     if (is_put || !info.access_flags().is_final()) {

       put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);

     }

   }

   cache_entry(thread)->set_field(

     get_code,

     put_code,

     info.klass(),

     info.field_index(),

     info.field_offset(),

     state,

     info.access_flags().is_final(),

     info.access_flags().is_volatile()

   );

 IRT_END

 //------------------------------------------------------------------------------------------------------------------------

 // Synchronization

 //

 // The interpreter's synchronization code is factored out so that it can

 // be shared by method invocation and synchronized blocks.

 //%note synchronization_3

 static void trace_locking(Handle& h_locking_obj, bool is_locking) {

   ObjectSynchronizer::trace_locking(h_locking_obj, false, true, is_locking);

 }

 //%note monitor_1

 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* thread, BasicObjectLock* elem))

 #ifdef ASSERT

   thread->last_frame().interpreter_frame_verify_monitor(elem);

 #endif

   if (PrintBiasedLockingStatistics) {

     Atomic::inc(BiasedLocking::slow_path_entry_count_addr());

   }

   Handle h_obj(thread, elem->obj());

   assert(Universe::heap()->is_in_reserved_or_null(h_obj()),

          "must be NULL or an object");

   if (UseBiasedLocking) {

     // Retry fast entry if bias is revoked to avoid unnecessary inflation

     ObjectSynchronizer::fast_enter(h_obj, elem->lock(), true, CHECK);

   } else {

     ObjectSynchronizer::slow_enter(h_obj, elem->lock(), CHECK);

   }

   assert(Universe::heap()->is_in_reserved_or_null(elem->obj()),

          "must be NULL or an object");

 #ifdef ASSERT

   thread->last_frame().interpreter_frame_verify_monitor(elem);

 #endif

 IRT_END

 //%note monitor_1

 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorexit(JavaThread* thread, BasicObjectLock* elem))

 #ifdef ASSERT

   thread->last_frame().interpreter_frame_verify_monitor(elem);

 #endif

   Handle h_obj(thread, elem->obj());

   assert(Universe::heap()->is_in_reserved_or_null(h_obj()),

          "must be NULL or an object");

   if (elem == NULL || h_obj()->is_unlocked()) {

     THROW(vmSymbols::java_lang_IllegalMonitorStateException());

   }

   ObjectSynchronizer::slow_exit(h_obj(), elem->lock(), thread);

   // Free entry. This must be done here, since a pending exception might be installed on

   // exit. If it is not cleared, the exception handling code will try to unlock the monitor again.

   elem->set_obj(NULL);

 #ifdef ASSERT

   thread->last_frame().interpreter_frame_verify_monitor(elem);

 #endif

 IRT_END

 IRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* thread))

   THROW(vmSymbols::java_lang_IllegalMonitorStateException());

 IRT_END

 IRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* thread))

   // Returns an illegal exception to install into the current thread. The

   // pending_exception flag is cleared so normal exception handling does not

   // trigger. Any current installed exception will be overwritten. This

   // method will be called during an exception unwind.

   assert(!HAS_PENDING_EXCEPTION, "no pending exception");

   Handle exception(thread, thread->vm_result());

   assert(exception() != NULL, "vm result should be set");

   thread->set_vm_result(NULL); // clear vm result before continuing (may cause memory leaks and assert failures)

   if (!exception->is_a(SystemDictionary::ThreadDeath_klass())) {

     exception = get_preinitialized_exception(

                        SystemDictionary::IllegalMonitorStateException_klass(),

                        CATCH);

   }

   thread->set_vm_result(exception());

 IRT_END

 //------------------------------------------------------------------------------------------------------------------------

 // Invokes

 IRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* thread, methodOopDesc* method, address bcp))

   return method->orig_bytecode_at(method->bci_from(bcp));

 IRT_END

 IRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* thread, methodOopDesc* method, address bcp, Bytecodes::Code new_code))

   method->set_orig_bytecode_at(method->bci_from(bcp), new_code);

 IRT_END

 IRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* thread, methodOopDesc* method, address bcp))

   JvmtiExport::post_raw_breakpoint(thread, method, bcp);

 IRT_END

 IRT_ENTRY(void, InterpreterRuntime::resolve_invoke(JavaThread* thread, Bytecodes::Code bytecode))

   // extract receiver from the outgoing argument list if necessary

   Handle receiver(thread, NULL);

   if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface) {

     ResourceMark rm(thread);

     methodHandle m (thread, method(thread));

     Bytecode_invoke call(m, bci(thread));

     Symbol* signature = call.signature();

     receiver = Handle(thread,

                   thread->last_frame().interpreter_callee_receiver(signature));

     assert(Universe::heap()->is_in_reserved_or_null(receiver()),

            "sanity check");

     assert(receiver.is_null() ||

            Universe::heap()->is_in_reserved(receiver->klass()),

            "sanity check");

   }

   // resolve method

   CallInfo info;

   constantPoolHandle pool(thread, method(thread)->constants());

   {

     JvmtiHideSingleStepping jhss(thread);

     LinkResolver::resolve_invoke(info, receiver, pool,

                                  get_index_u2_cpcache(thread, bytecode), bytecode, CHECK);

     if (JvmtiExport::can_hotswap_or_post_breakpoint()) {

       int retry_count = 0;

       while (info.resolved_method()->is_old()) {

         // It is very unlikely that method is redefined more than 100 times

         // in the middle of resolve. If it is looping here more than 100 times

         // means then there could be a bug here.

         guarantee((retry_count++ < 100),

                   "Could not resolve to latest version of redefined method");

         // method is redefined in the middle of resolve so re-try.

         LinkResolver::resolve_invoke(info, receiver, pool,

                                      get_index_u2_cpcache(thread, bytecode), bytecode, CHECK);

       }

     }

   } // end JvmtiHideSingleStepping

   // check if link resolution caused cpCache to be updated

   if (already_resolved(thread)) return;

   if (bytecode == Bytecodes::_invokeinterface) {

     if (TraceItables && Verbose) {

       ResourceMark rm(thread);

       tty->print_cr("Resolving: klass: %s to method: %s", info.resolved_klass()->name()->as_C_string(), info.resolved_method()->name()->as_C_string());

     }

     if (info.resolved_method()->method_holder() ==

                                             SystemDictionary::Object_klass()) {

       // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec

       // (see also cpCacheOop.cpp for details)

       methodHandle rm = info.resolved_method();

       assert(rm->is_final() || info.has_vtable_index(),

              "should have been set already");

       cache_entry(thread)->set_method(bytecode, rm, info.vtable_index());

     } else {

       // Setup itable entry

       int index = klassItable::compute_itable_index(info.resolved_method()());

       cache_entry(thread)->set_interface_call(info.resolved_method(), index);

     }

   } else {

     cache_entry(thread)->set_method(

       bytecode,

       info.resolved_method(),

       info.vtable_index());

   }

 IRT_END

 // First time execution:  Resolve symbols, create a permanent CallSite object.

 IRT_ENTRY(void, InterpreterRuntime::resolve_invokedynamic(JavaThread* thread)) {

   ResourceMark rm(thread);

   assert(EnableInvokeDynamic, "");

   const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;

   methodHandle caller_method(thread, method(thread));

   constantPoolHandle pool(thread, caller_method->constants());

   pool->set_invokedynamic();    // mark header to flag active call sites

   int caller_bci = 0;

   int site_index = 0;

   { address caller_bcp = bcp(thread);

     caller_bci = caller_method->bci_from(caller_bcp);

     site_index = Bytes::get_native_u4(caller_bcp+1);

   }

   assert(site_index == InterpreterRuntime::bytecode(thread).get_index_u4(bytecode), "");

   assert(constantPoolCacheOopDesc::is_secondary_index(site_index), "proper format");

   // there is a second CPC entries that is of interest; it caches signature info:

   int main_index = pool->cache()->secondary_entry_at(site_index)->main_entry_index();

   int pool_index = pool->cache()->entry_at(main_index)->constant_pool_index();

   // first resolve the signature to a MH.invoke methodOop

   if (!pool->cache()->entry_at(main_index)->is_resolved(bytecode)) {

     JvmtiHideSingleStepping jhss(thread);

     CallInfo callinfo;

     LinkResolver::resolve_invoke(callinfo, Handle(), pool,

                                  site_index, bytecode, CHECK);

     // The main entry corresponds to a JVM_CONSTANT_InvokeDynamic, and serves

     // as a common reference point for all invokedynamic call sites with

     // that exact call descriptor.  We will link it in the CP cache exactly

     // as if it were an invokevirtual of MethodHandle.invoke.

     pool->cache()->entry_at(main_index)->set_method(

       bytecode,

       callinfo.resolved_method(),

       callinfo.vtable_index());

   }

   // The method (f2 entry) of the main entry is the MH.invoke for the

   // invokedynamic target call signature.

   oop f1_value = pool->cache()->entry_at(main_index)->f1();

   methodHandle signature_invoker(THREAD, (methodOop) f1_value);

   assert(signature_invoker.not_null() && signature_invoker->is_method() && signature_invoker->is_method_handle_invoke(),

          "correct result from LinkResolver::resolve_invokedynamic");

   Handle info;  // optional argument(s) in JVM_CONSTANT_InvokeDynamic

   Handle bootm = SystemDictionary::find_bootstrap_method(caller_method, caller_bci,

                                                          main_index, info, CHECK);

   if (!java_lang_invoke_MethodHandle::is_instance(bootm())) {

     THROW_MSG(vmSymbols::java_lang_IllegalStateException(),

               "no bootstrap method found for invokedynamic");

   }

   // Short circuit if CallSite has been bound already:

   if (!pool->cache()->secondary_entry_at(site_index)->is_f1_null())

     return;

   Symbol*  call_site_name = pool->name_ref_at(site_index);

   Handle call_site

     = SystemDictionary::make_dynamic_call_site(bootm,

                                                // Callee information:

                                                call_site_name,

                                                signature_invoker,

                                                info,

                                                // Caller information:

                                                caller_method,

                                                caller_bci,

                                                CHECK);

   // In the secondary entry, the f1 field is the call site, and the f2 (index)

   // field is some data about the invoke site.  Currently, it is just the BCI.

   // Later, it might be changed to help manage inlining dependencies.

   pool->cache()->secondary_entry_at(site_index)->set_dynamic_call(call_site, signature_invoker);

 }

 IRT_END

 //------------------------------------------------------------------------------------------------------------------------

 // Miscellaneous

 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* thread, address branch_bcp) {

   nmethod* nm = frequency_counter_overflow_inner(thread, branch_bcp);

   assert(branch_bcp != NULL || nm == NULL, "always returns null for non OSR requests");

   if (branch_bcp != NULL && nm != NULL) {

     // This was a successful request for an OSR nmethod.  Because

     // frequency_counter_overflow_inner ends with a safepoint check,

     // nm could have been unloaded so look it up again.  It's unsafe

     // to examine nm directly since it might have been freed and used

     // for something else.

     frame fr = thread->last_frame();

     methodOop method =  fr.interpreter_frame_method();

     int bci = method->bci_from(fr.interpreter_frame_bcp());

     nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);

   }

   return nm;

 }

 IRT_ENTRY(nmethod*,

           InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* thread, address branch_bcp))

   // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized

   // flag, in case this method triggers classloading which will call into Java.

   UnlockFlagSaver fs(thread);

   frame fr = thread->last_frame();

   assert(fr.is_interpreted_frame(), "must come from interpreter");

   methodHandle method(thread, fr.interpreter_frame_method());

   const int branch_bci = branch_bcp != NULL ? method->bci_from(branch_bcp) : InvocationEntryBci;

   const int bci = branch_bcp != NULL ? method->bci_from(fr.interpreter_frame_bcp()) : InvocationEntryBci;

   nmethod* osr_nm = CompilationPolicy::policy()->event(method, method, branch_bci, bci, CompLevel_none, thread);

   if (osr_nm != NULL) {

     // We may need to do on-stack replacement which requires that no

     // monitors in the activation are biased because their

     // BasicObjectLocks will need to migrate during OSR. Force

     // unbiasing of all monitors in the activation now (even though

     // the OSR nmethod might be invalidated) because we don't have a

     // safepoint opportunity later once the migration begins.

     if (UseBiasedLocking) {

       ResourceMark rm;

       GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>();

       for( BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();

            kptr < fr.interpreter_frame_monitor_begin();

            kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {

         if( kptr->obj() != NULL ) {

           objects_to_revoke->append(Handle(THREAD, kptr->obj()));

         }

       }

       BiasedLocking::revoke(objects_to_revoke);

     }

   }

   return osr_nm;

 IRT_END

 IRT_LEAF(jint, InterpreterRuntime::bcp_to_di(methodOopDesc* method, address cur_bcp))

   assert(ProfileInterpreter, "must be profiling interpreter");

   int bci = method->bci_from(cur_bcp);

   methodDataOop mdo = method->method_data();

   if (mdo == NULL)  return 0;

   return mdo->bci_to_di(bci);

 IRT_END

 IRT_ENTRY(void, InterpreterRuntime::profile_method(JavaThread* thread))

   // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized

   // flag, in case this method triggers classloading which will call into Java.

   UnlockFlagSaver fs(thread);

   assert(ProfileInterpreter, "must be profiling interpreter");

   frame fr = thread->last_frame();

   assert(fr.is_interpreted_frame(), "must come from interpreter");

   methodHandle method(thread, fr.interpreter_frame_method());

   methodOopDesc::build_interpreter_method_data(method, THREAD);

   if (HAS_PENDING_EXCEPTION) {

     assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");

     CLEAR_PENDING_EXCEPTION;

     // and fall through...

   }

 IRT_END

 #ifdef ASSERT

 IRT_LEAF(void, InterpreterRuntime::verify_mdp(methodOopDesc* method, address bcp, address mdp))

   assert(ProfileInterpreter, "must be profiling interpreter");

   methodDataOop mdo = method->method_data();

   assert(mdo != NULL, "must not be null");

   int bci = method->bci_from(bcp);

   address mdp2 = mdo->bci_to_dp(bci);

   if (mdp != mdp2) {

     ResourceMark rm;

     ResetNoHandleMark rnm; // In a LEAF entry.

     HandleMark hm;

     tty->print_cr("FAILED verify : actual mdp %p   expected mdp %p @ bci %d", mdp, mdp2, bci);

     int current_di = mdo->dp_to_di(mdp);

     int expected_di  = mdo->dp_to_di(mdp2);

     tty->print_cr("  actual di %d   expected di %d", current_di, expected_di);

     int expected_approx_bci = mdo->data_at(expected_di)->bci();

     int approx_bci = -1;

     if (current_di >= 0) {

       approx_bci = mdo->data_at(current_di)->bci();

     }

     tty->print_cr("  actual bci is %d  expected bci %d", approx_bci, expected_approx_bci);

     mdo->print_on(tty);

     method->print_codes();

   }

   assert(mdp == mdp2, "wrong mdp");

 IRT_END

 #endif // ASSERT

 IRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* thread, int return_bci))

   assert(ProfileInterpreter, "must be profiling interpreter");

   ResourceMark rm(thread);

   HandleMark hm(thread);

   frame fr = thread->last_frame();

   assert(fr.is_interpreted_frame(), "must come from interpreter");

   methodDataHandle h_mdo(thread, fr.interpreter_frame_method()->method_data());

   // Grab a lock to ensure atomic access to setting the return bci and

   // the displacement.  This can block and GC, invalidating all naked oops.

   MutexLocker ml(RetData_lock);

   // ProfileData is essentially a wrapper around a derived oop, so we

   // need to take the lock before making any ProfileData structures.

   ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(fr.interpreter_frame_mdp()));

   RetData* rdata = data->as_RetData();

   address new_mdp = rdata->fixup_ret(return_bci, h_mdo);

   fr.interpreter_frame_set_mdp(new_mdp);

 IRT_END

 IRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* thread))

   // We used to need an explict preserve_arguments here for invoke bytecodes. However,

   // stack traversal automatically takes care of preserving arguments for invoke, so

   // this is no longer needed.

   // IRT_END does an implicit safepoint check, hence we are guaranteed to block

   // if this is called during a safepoint

   if (JvmtiExport::should_post_single_step()) {

     // We are called during regular safepoints and when the VM is

     // single stepping. If any thread is marked for single stepping,

     // then we may have JVMTI work to do.

     JvmtiExport::at_single_stepping_point(thread, method(thread), bcp(thread));

   }

 IRT_END

 IRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread *thread, oopDesc* obj,

 ConstantPoolCacheEntry *cp_entry))

   // check the access_flags for the field in the klass

   instanceKlass* ik = instanceKlass::cast(java_lang_Class::as_klassOop(cp_entry->f1()));

   typeArrayOop fields = ik->fields();

   int index = cp_entry->field_index();

   assert(index < fields->length(), "holders field index is out of range");

   // bail out if field accesses are not watched

   if ((fields->ushort_at(index) & JVM_ACC_FIELD_ACCESS_WATCHED) == 0) return;

   switch(cp_entry->flag_state()) {

     case btos:    // fall through

     case ctos:    // fall through

     case stos:    // fall through

     case itos:    // fall through

     case ftos:    // fall through

     case ltos:    // fall through

     case dtos:    // fall through

     case atos: break;

     default: ShouldNotReachHere(); return;

   }

   bool is_static = (obj == NULL);

   HandleMark hm(thread);

   Handle h_obj;

   if (!is_static) {

     // non-static field accessors have an object, but we need a handle

     h_obj = Handle(thread, obj);

   }

   instanceKlassHandle h_cp_entry_f1(thread, java_lang_Class::as_klassOop(cp_entry->f1()));

   jfieldID fid = jfieldIDWorkaround::to_jfieldID(h_cp_entry_f1, cp_entry->f2(), is_static);

   JvmtiExport::post_field_access(thread, method(thread), bcp(thread), h_cp_entry_f1, h_obj, fid);

 IRT_END

 IRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread *thread,

   oopDesc* obj, ConstantPoolCacheEntry *cp_entry, jvalue *value))

   klassOop k = java_lang_Class::as_klassOop(cp_entry->f1());

   // check the access_flags for the field in the klass

   instanceKlass* ik = instanceKlass::cast(k);

   typeArrayOop fields = ik->fields();

   int index = cp_entry->field_index();

   assert(index < fields->length(), "holders field index is out of range");

   // bail out if field modifications are not watched

   if ((fields->ushort_at(index) & JVM_ACC_FIELD_MODIFICATION_WATCHED) == 0) return;

   char sig_type = '\0';

   switch(cp_entry->flag_state()) {

     case btos: sig_type = 'Z'; break;

     case ctos: sig_type = 'C'; break;

     case stos: sig_type = 'S'; break;

     case itos: sig_type = 'I'; break;

     case ftos: sig_type = 'F'; break;

     case atos: sig_type = 'L'; break;

     case ltos: sig_type = 'J'; break;

     case dtos: sig_type = 'D'; break;

     default:  ShouldNotReachHere(); return;

   }

   bool is_static = (obj == NULL);

   HandleMark hm(thread);

   instanceKlassHandle h_klass(thread, k);

   jfieldID fid = jfieldIDWorkaround::to_jfieldID(h_klass, cp_entry->f2(), is_static);

   jvalue fvalue;

 #ifdef _LP64

   fvalue = *value;

 #else

   // Long/double values are stored unaligned and also noncontiguously with

   // tagged stacks.  We can't just do a simple assignment even in the non-

   // J/D cases because a C++ compiler is allowed to assume that a jvalue is

   // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.

   // We assume that the two halves of longs/doubles are stored in interpreter

   // stack slots in platform-endian order.

   jlong_accessor u;

   jint* newval = (jint*)value;

   u.words[0] = newval[0];

   u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag

   fvalue.j = u.long_value;

 #endif // _LP64

   Handle h_obj;

   if (!is_static) {

     // non-static field accessors have an object, but we need a handle

     h_obj = Handle(thread, obj);

   }

   JvmtiExport::post_raw_field_modification(thread, method(thread), bcp(thread), h_klass, h_obj,

                                            fid, sig_type, &fvalue);

 IRT_END

 IRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread *thread))

   JvmtiExport::post_method_entry(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread));

 IRT_END

 IRT_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread *thread))

   JvmtiExport::post_method_exit(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread));

 IRT_END

 IRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))

 {

   return (Interpreter::contains(pc) ? 1 : 0);

 }

 IRT_END

 // Implementation of SignatureHandlerLibrary

 address SignatureHandlerLibrary::set_handler_blob() {

   BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);

   if (handler_blob == NULL) {

     return NULL;

   }

   address handler = handler_blob->code_begin();

   _handler_blob = handler_blob;

   _handler = handler;

   return handler;

 }

 void SignatureHandlerLibrary::initialize() {

   if (_fingerprints != NULL) {

     return;

   }

   if (set_handler_blob() == NULL) {

     vm_exit_out_of_memory(blob_size, "native signature handlers");

   }

   BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",

                                       SignatureHandlerLibrary::buffer_size);

   _buffer = bb->code_begin();

   _fingerprints = new(ResourceObj::C_HEAP)GrowableArray<uint64_t>(32, true);

   _handlers     = new(ResourceObj::C_HEAP)GrowableArray<address>(32, true);

 }

 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {

   address handler   = _handler;

   int     insts_size = buffer->pure_insts_size();

   if (handler + insts_size > _handler_blob->code_end()) {

     // get a new handler blob

     handler = set_handler_blob();

   }

   if (handler != NULL) {

     memcpy(handler, buffer->insts_begin(), insts_size);

     pd_set_handler(handler);

     ICache::invalidate_range(handler, insts_size);

     _handler = handler + insts_size;

   }

   return handler;

 }

 void SignatureHandlerLibrary::add(methodHandle method) {

   if (method->signature_handler() == NULL) {

     // use slow signature handler if we can't do better

     int handler_index = -1;

     // check if we can use customized (fast) signature handler

     if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::max_size_of_parameters) {

       // use customized signature handler

       MutexLocker mu(SignatureHandlerLibrary_lock);

       // make sure data structure is initialized

       initialize();

       // lookup method signature's fingerprint

       uint64_t fingerprint = Fingerprinter(method).fingerprint();

       handler_index = _fingerprints->find(fingerprint);

       // create handler if necessary

       if (handler_index < 0) {

         ResourceMark rm;

         ptrdiff_t align_offset = (address)

           round_to((intptr_t)_buffer, CodeEntryAlignment) - (address)_buffer;

         CodeBuffer buffer((address)(_buffer + align_offset),

                           SignatureHandlerLibrary::buffer_size - align_offset);

         InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);

         // copy into code heap

         address handler = set_handler(&buffer);

         if (handler == NULL) {

           // use slow signature handler

         } else {

           // debugging suppport

           if (PrintSignatureHandlers) {

             tty->cr();

             tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",

                           _handlers->length(),

                           (method->is_static() ? "static" : "receiver"),

                           method->name_and_sig_as_C_string(),

                           fingerprint,

                           buffer.insts_size());

             Disassembler::decode(handler, handler + buffer.insts_size());

 #ifndef PRODUCT

             tty->print_cr(" --- associated result handler ---");

             address rh_begin = Interpreter::result_handler(method()->result_type());

             address rh_end = rh_begin;

             while (*(int*)rh_end != 0) {

               rh_end += sizeof(int);

             }

             Disassembler::decode(rh_begin, rh_end);

 #endif

           }

           // add handler to library

           _fingerprints->append(fingerprint);

           _handlers->append(handler);

           // set handler index

           assert(_fingerprints->length() == _handlers->length(), "sanity check");

           handler_index = _fingerprints->length() - 1;

         }

       }

       // Set handler under SignatureHandlerLibrary_lock

     if (handler_index < 0) {

       // use generic signature handler

       method->set_signature_handler(Interpreter::slow_signature_handler());

     } else {

       // set handler

       method->set_signature_handler(_handlers->at(handler_index));

     }

     } else {

       CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());

       // use generic signature handler

       method->set_signature_handler(Interpreter::slow_signature_handler());

     }

   }

 #ifdef ASSERT

   int handler_index = -1;

   int fingerprint_index = -2;

   {

     // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized

     // in any way if accessed from multiple threads. To avoid races with another

     // thread which may change the arrays in the above, mutex protected block, we

     // have to protect this read access here with the same mutex as well!

     MutexLocker mu(SignatureHandlerLibrary_lock);

     if (_handlers != NULL) {

     handler_index = _handlers->find(method->signature_handler());

     fingerprint_index = _fingerprints->find(Fingerprinter(method).fingerprint());

   }

   }

   assert(method->signature_handler() == Interpreter::slow_signature_handler() ||

          handler_index == fingerprint_index, "sanity check");

 #endif // ASSERT

 }

 BufferBlob*              SignatureHandlerLibrary::_handler_blob = NULL;

 address                  SignatureHandlerLibrary::_handler      = NULL;

 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = NULL;

 GrowableArray<address>*  SignatureHandlerLibrary::_handlers     = NULL;

 address                  SignatureHandlerLibrary::_buffer       = NULL;

 IRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* thread, methodOopDesc* method))

   methodHandle m(thread, method);

   assert(m->is_native(), "sanity check");

   // lookup native function entry point if it doesn't exist

   bool in_base_library;

   if (!m->has_native_function()) {

     NativeLookup::lookup(m, in_base_library, CHECK);

   }

   // make sure signature handler is installed

   SignatureHandlerLibrary::add(m);

   // The interpreter entry point checks the signature handler first,

   // before trying to fetch the native entry point and klass mirror.

   // We must set the signature handler last, so that multiple processors

   // preparing the same method will be sure to see non-null entry & mirror.

 IRT_END

 #if defined(IA32) || defined(AMD64)

 IRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* thread, void* src_address, void* dest_address))

   if (src_address == dest_address) {

     return;

   }

   ResetNoHandleMark rnm; // In a LEAF entry.

   HandleMark hm;

   ResourceMark rm;

   frame fr = thread->last_frame();

   assert(fr.is_interpreted_frame(), "");

   jint bci = fr.interpreter_frame_bci();

   methodHandle mh(thread, fr.interpreter_frame_method());

   Bytecode_invoke invoke(mh, bci);

   ArgumentSizeComputer asc(invoke.signature());

   int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver

   Copy::conjoint_jbytes(src_address, dest_address,

                        size_of_arguments * Interpreter::stackElementSize);

 IRT_END

 #endif