jdk8-mips64-public/hotspot: src/share/vm/interpreter/interpreterRuntime.cpp@136b78722a08 (annotated)

src/share/vm/interpreter/interpreterRuntime.cpp@136b78722a08 (annotated)

src/share/vm/interpreter/interpreterRuntime.cpp

Wed, 09 Jun 2010 18:50:45 -0700

author: jrose
date: Wed, 09 Jun 2010 18:50:45 -0700
changeset 1957: 136b78722a08
parent 1934: e9ff18c4ace7
child 1958: d93949c5bdcc
permissions: -rw-r--r--

6939203: JSR 292 needs method handle constants
Summary: Add new CP types CONSTANT_MethodHandle, CONSTANT_MethodType; extend 'ldc' bytecode.
Reviewed-by: twisti, never

 /*
  * Copyright (c) 1997, 2010, 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 "incls/_precompiled.incl"
 #include "incls/_interpreterRuntime.cpp.incl"
 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->klass_part()->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 = Bytecode_loadconstant_at(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
   symbolHandle s = oopFactory::new_symbol_handle(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
   symbolHandle s = oopFactory::new_symbol_handle(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
   symbolHandle s = oopFactory::new_symbol_handle(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_dyn_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 = Bytecode_invoke_at(m, bci(thread));
     symbolHandle signature (thread, 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));
   // first find the bootstrap method
   KlassHandle caller_klass(thread, caller_method->method_holder());
   Handle bootm = SystemDictionary::find_bootstrap_method(caller_klass, CHECK);
   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();
   // first resolve the signature to a MH.invoke methodOop
   if (!pool->cache()->entry_at(main_index)->is_resolved(bytecode)) {
     JvmtiHideSingleStepping jhss(thread);
     CallInfo info;
     LinkResolver::resolve_invoke(info, Handle(), pool,
                                  site_index, bytecode, CHECK);
     // The main entry corresponds to a JVM_CONSTANT_NameAndType, 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,
       info.resolved_method(),
       info.vtable_index());
     assert(pool->cache()->entry_at(main_index)->is_vfinal(), "f2 must be a methodOop");
   }
   // The method (f2 entry) of the main entry is the MH.invoke for the
   // invokedynamic target call signature.
   intptr_t f2_value = pool->cache()->entry_at(main_index)->f2();
   methodHandle signature_invoker(THREAD, (methodOop) f2_value);
   assert(signature_invoker.not_null() && signature_invoker->is_method() && signature_invoker->is_method_handle_invoke(),
          "correct result from LinkResolver::resolve_invokedynamic");
   symbolHandle call_site_name(THREAD, pool->name_ref_at(site_index));
   Handle info;  // NYI: Other metadata from a new kind of CP entry.  (Annotations?)
   // this is the index which gets stored on the CallSite object (as "callerPosition"):
   int call_site_position = constantPoolCacheOopDesc::decode_secondary_index(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
 #ifndef PRODUCT
 static void trace_frequency_counter_overflow(methodHandle m, int branch_bci, int bci, address branch_bcp) {
   if (TraceInvocationCounterOverflow) {
     InvocationCounter* ic = m->invocation_counter();
     InvocationCounter* bc = m->backedge_counter();
     ResourceMark rm;
     const char* msg =
       branch_bcp == NULL
       ? "comp-policy cntr ovfl @ %d in entry of "
       : "comp-policy cntr ovfl @ %d in loop of ";
     tty->print(msg, bci);
     m->print_value();
     tty->cr();
     ic->print();
     bc->print();
     if (ProfileInterpreter) {
       if (branch_bcp != NULL) {
         methodDataOop mdo = m->method_data();
         if (mdo != NULL) {
           int count = mdo->bci_to_data(branch_bci)->as_JumpData()->taken();
           tty->print_cr("back branch count = %d", count);
         }
       }
     }
   }
 }
 static void trace_osr_request(methodHandle method, nmethod* osr, int bci) {
   if (TraceOnStackReplacement) {
     ResourceMark rm;
     tty->print(osr != NULL ? "Reused OSR entry for " : "Requesting OSR entry for ");
     method->print_short_name(tty);
     tty->print_cr(" at bci %d", bci);
   }
 }
 #endif // !PRODUCT
 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);
   }
   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) : 0;
   const int bci = method->bci_from(fr.interpreter_frame_bcp());
   NOT_PRODUCT(trace_frequency_counter_overflow(method, branch_bci, bci, branch_bcp);)
   if (JvmtiExport::can_post_interpreter_events()) {
     if (thread->is_interp_only_mode()) {
       // If certain JVMTI events (e.g. frame pop event) are requested then the
       // thread is forced to remain in interpreted code. This is
       // implemented partly by a check in the run_compiled_code
       // section of the interpreter whether we should skip running
       // compiled code, and partly by skipping OSR compiles for
       // interpreted-only threads.
       if (branch_bcp != NULL) {
         CompilationPolicy::policy()->reset_counter_for_back_branch_event(method);
         return NULL;
       }
     }
   }
   if (branch_bcp == NULL) {
     // when code cache is full, compilation gets switched off, UseCompiler
     // is set to false
     if (!method->has_compiled_code() && UseCompiler) {
       CompilationPolicy::policy()->method_invocation_event(method, CHECK_NULL);
     } else {
       // Force counter overflow on method entry, even if no compilation
       // happened.  (The method_invocation_event call does this also.)
       CompilationPolicy::policy()->reset_counter_for_invocation_event(method);
     }
     // compilation at an invocation overflow no longer goes and retries test for
     // compiled method. We always run the loser of the race as interpreted.
     // so return NULL
     return NULL;
   } else {
     // counter overflow in a loop => try to do on-stack-replacement
     nmethod* osr_nm = method->lookup_osr_nmethod_for(bci);
     NOT_PRODUCT(trace_osr_request(method, osr_nm, bci);)
     // when code cache is full, we should not compile any more...
     if (osr_nm == NULL && UseCompiler) {
       const int branch_bci = method->bci_from(branch_bcp);
       CompilationPolicy::policy()->method_back_branch_event(method, branch_bci, bci, CHECK_NULL);
       osr_nm = method->lookup_osr_nmethod_for(bci);
     }
     if (osr_nm == NULL) {
       CompilationPolicy::policy()->reset_counter_for_back_branch_event(method);
       return NULL;
     } else {
       // 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(jint, InterpreterRuntime::profile_method(JavaThread* thread, address cur_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);
   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());
   int bci = method->bci_from(cur_bcp);
   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...
   }
   methodDataOop mdo = method->method_data();
   if (mdo == NULL)  return 0;
   return mdo->bci_to_di(bci);
 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((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, (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 = (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->instructions_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->instructions_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     code_size = buffer->pure_code_size();
   if (handler + code_size > _handler_blob->instructions_end()) {
     // get a new handler blob
     handler = set_handler_blob();
   }
   if (handler != NULL) {
     memcpy(handler, buffer->code_begin(), code_size);
     pd_set_handler(handler);
     ICache::invalidate_range(handler, code_size);
     _handler = handler + code_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.code_size());
             Disassembler::decode(handler, handler + buffer.code_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;
         }
       }
     } else {
       CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
     }
     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));
     }
   }
   assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
          _handlers->find(method->signature_handler()) == _fingerprints->find(Fingerprinter(method).fingerprint()),
          "sanity check");
 }
 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 = Bytecode_invoke_at(mh, bci);
   ArgumentSizeComputer asc(invoke->signature());
   int size_of_arguments = (asc.size() + (invoke->has_receiver() ? 1 : 0)); // receiver
   Copy::conjoint_bytes(src_address, dest_address,
                        size_of_arguments * Interpreter::stackElementSize);
 IRT_END
 #endif

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/interpreter/interpreterRuntime.cpp@136b78722a08 (annotated)

src/share/vm/interpreter/interpreterRuntime.cpp