Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 1999, 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 "asm/codeBuffer.hpp"

 #include "c1/c1_CodeStubs.hpp"

 #include "c1/c1_Defs.hpp"

 #include "c1/c1_FrameMap.hpp"

 #include "c1/c1_LIRAssembler.hpp"

 #include "c1/c1_MacroAssembler.hpp"

 #include "c1/c1_Runtime1.hpp"

 #include "classfile/systemDictionary.hpp"

 #include "classfile/vmSymbols.hpp"

 #include "code/codeBlob.hpp"

 #include "code/compiledIC.hpp"

 #include "code/pcDesc.hpp"

 #include "code/scopeDesc.hpp"

 #include "code/vtableStubs.hpp"

 #include "compiler/disassembler.hpp"

 #include "gc_interface/collectedHeap.hpp"

 #include "interpreter/bytecode.hpp"

 #include "interpreter/interpreter.hpp"

 #include "memory/allocation.inline.hpp"

 #include "memory/barrierSet.hpp"

 #include "memory/oopFactory.hpp"

 #include "memory/resourceArea.hpp"

 #include "oops/objArrayKlass.hpp"

 #include "oops/oop.inline.hpp"

 #include "runtime/biasedLocking.hpp"

 #include "runtime/compilationPolicy.hpp"

 #include "runtime/interfaceSupport.hpp"

 #include "runtime/javaCalls.hpp"

 #include "runtime/sharedRuntime.hpp"

 #include "runtime/threadCritical.hpp"

 #include "runtime/vframe.hpp"

 #include "runtime/vframeArray.hpp"

 #include "utilities/copy.hpp"

 #include "utilities/events.hpp"

 // Implementation of StubAssembler

 StubAssembler::StubAssembler(CodeBuffer* code, const char * name, int stub_id) : C1_MacroAssembler(code) {

   _name = name;

   _must_gc_arguments = false;

   _frame_size = no_frame_size;

   _num_rt_args = 0;

   _stub_id = stub_id;

 }

 void StubAssembler::set_info(const char* name, bool must_gc_arguments) {

   _name = name;

   _must_gc_arguments = must_gc_arguments;

 }

 void StubAssembler::set_frame_size(int size) {

   if (_frame_size == no_frame_size) {

     _frame_size = size;

   }

   assert(_frame_size == size, "can't change the frame size");

 }

 void StubAssembler::set_num_rt_args(int args) {

   if (_num_rt_args == 0) {

     _num_rt_args = args;

   }

   assert(_num_rt_args == args, "can't change the number of args");

 }

 // Implementation of Runtime1

 CodeBlob* Runtime1::_blobs[Runtime1::number_of_ids];

 const char *Runtime1::_blob_names[] = {

   RUNTIME1_STUBS(STUB_NAME, LAST_STUB_NAME)

 };

 #ifndef PRODUCT

 // statistics

 int Runtime1::_generic_arraycopy_cnt = 0;

 int Runtime1::_primitive_arraycopy_cnt = 0;

 int Runtime1::_oop_arraycopy_cnt = 0;

 int Runtime1::_generic_arraycopystub_cnt = 0;

 int Runtime1::_arraycopy_slowcase_cnt = 0;

 int Runtime1::_arraycopy_checkcast_cnt = 0;

 int Runtime1::_arraycopy_checkcast_attempt_cnt = 0;

 int Runtime1::_new_type_array_slowcase_cnt = 0;

 int Runtime1::_new_object_array_slowcase_cnt = 0;

 int Runtime1::_new_instance_slowcase_cnt = 0;

 int Runtime1::_new_multi_array_slowcase_cnt = 0;

 int Runtime1::_monitorenter_slowcase_cnt = 0;

 int Runtime1::_monitorexit_slowcase_cnt = 0;

 int Runtime1::_patch_code_slowcase_cnt = 0;

 int Runtime1::_throw_range_check_exception_count = 0;

 int Runtime1::_throw_index_exception_count = 0;

 int Runtime1::_throw_div0_exception_count = 0;

 int Runtime1::_throw_null_pointer_exception_count = 0;

 int Runtime1::_throw_class_cast_exception_count = 0;

 int Runtime1::_throw_incompatible_class_change_error_count = 0;

 int Runtime1::_throw_array_store_exception_count = 0;

 int Runtime1::_throw_count = 0;

 static int _byte_arraycopy_cnt = 0;

 static int _short_arraycopy_cnt = 0;

 static int _int_arraycopy_cnt = 0;

 static int _long_arraycopy_cnt = 0;

 static int _oop_arraycopy_cnt = 0;

 address Runtime1::arraycopy_count_address(BasicType type) {

   switch (type) {

   case T_BOOLEAN:

   case T_BYTE:   return (address)&_byte_arraycopy_cnt;

   case T_CHAR:

   case T_SHORT:  return (address)&_short_arraycopy_cnt;

   case T_FLOAT:

   case T_INT:    return (address)&_int_arraycopy_cnt;

   case T_DOUBLE:

   case T_LONG:   return (address)&_long_arraycopy_cnt;

   case T_ARRAY:

   case T_OBJECT: return (address)&_oop_arraycopy_cnt;

   default:

     ShouldNotReachHere();

     return NULL;

   }

 }

 #endif

 // Simple helper to see if the caller of a runtime stub which

 // entered the VM has been deoptimized

 static bool caller_is_deopted() {

   JavaThread* thread = JavaThread::current();

   RegisterMap reg_map(thread, false);

   frame runtime_frame = thread->last_frame();

   frame caller_frame = runtime_frame.sender(&reg_map);

   assert(caller_frame.is_compiled_frame(), "must be compiled");

   return caller_frame.is_deoptimized_frame();

 }

 // Stress deoptimization

 static void deopt_caller() {

   if ( !caller_is_deopted()) {

     JavaThread* thread = JavaThread::current();

     RegisterMap reg_map(thread, false);

     frame runtime_frame = thread->last_frame();

     frame caller_frame = runtime_frame.sender(&reg_map);

     Deoptimization::deoptimize_frame(thread, caller_frame.id());

     assert(caller_is_deopted(), "Must be deoptimized");

   }

 }

 void Runtime1::generate_blob_for(BufferBlob* buffer_blob, StubID id) {

   assert(0 <= id && id < number_of_ids, "illegal stub id");

   ResourceMark rm;

   // create code buffer for code storage

   CodeBuffer code(buffer_blob);

   Compilation::setup_code_buffer(&code, 0);

   // create assembler for code generation

   StubAssembler* sasm = new StubAssembler(&code, name_for(id), id);

   // generate code for runtime stub

   OopMapSet* oop_maps;

   oop_maps = generate_code_for(id, sasm);

   assert(oop_maps == NULL || sasm->frame_size() != no_frame_size,

          "if stub has an oop map it must have a valid frame size");

 #ifdef ASSERT

   // Make sure that stubs that need oopmaps have them

   switch (id) {

     // These stubs don't need to have an oopmap

     case dtrace_object_alloc_id:

     case g1_pre_barrier_slow_id:

     case g1_post_barrier_slow_id:

     case slow_subtype_check_id:

     case fpu2long_stub_id:

     case unwind_exception_id:

     case counter_overflow_id:

 #if defined(SPARC) || defined(PPC)

     case handle_exception_nofpu_id:  // Unused on sparc

 #endif

       break;

     // All other stubs should have oopmaps

     default:

       assert(oop_maps != NULL, "must have an oopmap");

   }

 #endif

   // align so printing shows nop's instead of random code at the end (SimpleStubs are aligned)

   sasm->align(BytesPerWord);

   // make sure all code is in code buffer

   sasm->flush();

   // create blob - distinguish a few special cases

   CodeBlob* blob = RuntimeStub::new_runtime_stub(name_for(id),

                                                  &code,

                                                  CodeOffsets::frame_never_safe,

                                                  sasm->frame_size(),

                                                  oop_maps,

                                                  sasm->must_gc_arguments());

   // install blob

   assert(blob != NULL, "blob must exist");

   _blobs[id] = blob;

 }

 void Runtime1::initialize(BufferBlob* blob) {

   // platform-dependent initialization

   initialize_pd();

   // generate stubs

   for (int id = 0; id < number_of_ids; id++) generate_blob_for(blob, (StubID)id);

   // printing

 #ifndef PRODUCT

   if (PrintSimpleStubs) {

     ResourceMark rm;

     for (int id = 0; id < number_of_ids; id++) {

       _blobs[id]->print();

       if (_blobs[id]->oop_maps() != NULL) {

         _blobs[id]->oop_maps()->print();

       }

     }

   }

 #endif

 }

 CodeBlob* Runtime1::blob_for(StubID id) {

   assert(0 <= id && id < number_of_ids, "illegal stub id");

   return _blobs[id];

 }

 const char* Runtime1::name_for(StubID id) {

   assert(0 <= id && id < number_of_ids, "illegal stub id");

   return _blob_names[id];

 }

 const char* Runtime1::name_for_address(address entry) {

   for (int id = 0; id < number_of_ids; id++) {

     if (entry == entry_for((StubID)id)) return name_for((StubID)id);

   }

 #define FUNCTION_CASE(a, f) \

   if ((intptr_t)a == CAST_FROM_FN_PTR(intptr_t, f))  return #f

   FUNCTION_CASE(entry, os::javaTimeMillis);

   FUNCTION_CASE(entry, os::javaTimeNanos);

   FUNCTION_CASE(entry, SharedRuntime::OSR_migration_end);

   FUNCTION_CASE(entry, SharedRuntime::d2f);

   FUNCTION_CASE(entry, SharedRuntime::d2i);

   FUNCTION_CASE(entry, SharedRuntime::d2l);

   FUNCTION_CASE(entry, SharedRuntime::dcos);

   FUNCTION_CASE(entry, SharedRuntime::dexp);

   FUNCTION_CASE(entry, SharedRuntime::dlog);

   FUNCTION_CASE(entry, SharedRuntime::dlog10);

   FUNCTION_CASE(entry, SharedRuntime::dpow);

   FUNCTION_CASE(entry, SharedRuntime::drem);

   FUNCTION_CASE(entry, SharedRuntime::dsin);

   FUNCTION_CASE(entry, SharedRuntime::dtan);

   FUNCTION_CASE(entry, SharedRuntime::f2i);

   FUNCTION_CASE(entry, SharedRuntime::f2l);

   FUNCTION_CASE(entry, SharedRuntime::frem);

   FUNCTION_CASE(entry, SharedRuntime::l2d);

   FUNCTION_CASE(entry, SharedRuntime::l2f);

   FUNCTION_CASE(entry, SharedRuntime::ldiv);

   FUNCTION_CASE(entry, SharedRuntime::lmul);

   FUNCTION_CASE(entry, SharedRuntime::lrem);

   FUNCTION_CASE(entry, SharedRuntime::lrem);

   FUNCTION_CASE(entry, SharedRuntime::dtrace_method_entry);

   FUNCTION_CASE(entry, SharedRuntime::dtrace_method_exit);

   FUNCTION_CASE(entry, trace_block_entry);

 #undef FUNCTION_CASE

   // Soft float adds more runtime names.

   return pd_name_for_address(entry);

 }

 JRT_ENTRY(void, Runtime1::new_instance(JavaThread* thread, klassOopDesc* klass))

   NOT_PRODUCT(_new_instance_slowcase_cnt++;)

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

   instanceKlassHandle h(thread, klass);

   h->check_valid_for_instantiation(true, CHECK);

   // make sure klass is initialized

   h->initialize(CHECK);

   // allocate instance and return via TLS

   oop obj = h->allocate_instance(CHECK);

   thread->set_vm_result(obj);

 JRT_END

 JRT_ENTRY(void, Runtime1::new_type_array(JavaThread* thread, klassOopDesc* klass, jint length))

   NOT_PRODUCT(_new_type_array_slowcase_cnt++;)

   // Note: no handle for klass needed since they are not used

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

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

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

   BasicType elt_type = typeArrayKlass::cast(klass)->element_type();

   oop obj = oopFactory::new_typeArray(elt_type, length, CHECK);

   thread->set_vm_result(obj);

   // This is pretty rare but this runtime patch is stressful to deoptimization

   // if we deoptimize here so force a deopt to stress the path.

   if (DeoptimizeALot) {

     deopt_caller();

   }

 JRT_END

 JRT_ENTRY(void, Runtime1::new_object_array(JavaThread* thread, klassOopDesc* array_klass, jint length))

   NOT_PRODUCT(_new_object_array_slowcase_cnt++;)

   // Note: no handle for 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!)

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

   klassOop elem_klass = objArrayKlass::cast(array_klass)->element_klass();

   objArrayOop obj = oopFactory::new_objArray(elem_klass, length, CHECK);

   thread->set_vm_result(obj);

   // This is pretty rare but this runtime patch is stressful to deoptimization

   // if we deoptimize here so force a deopt to stress the path.

   if (DeoptimizeALot) {

     deopt_caller();

   }

 JRT_END

 JRT_ENTRY(void, Runtime1::new_multi_array(JavaThread* thread, klassOopDesc* klass, int rank, jint* dims))

   NOT_PRODUCT(_new_multi_array_slowcase_cnt++;)

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

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

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

   thread->set_vm_result(obj);

 JRT_END

 JRT_ENTRY(void, Runtime1::unimplemented_entry(JavaThread* thread, StubID id))

   tty->print_cr("Runtime1::entry_for(%d) returned unimplemented entry point", id);

 JRT_END

 JRT_ENTRY(void, Runtime1::throw_array_store_exception(JavaThread* thread, oopDesc* obj))

   ResourceMark rm(thread);

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

   SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArrayStoreException(), klass_name);

 JRT_END

 JRT_ENTRY(void, Runtime1::post_jvmti_exception_throw(JavaThread* thread))

   if (JvmtiExport::can_post_on_exceptions()) {

     vframeStream vfst(thread, true);

     address bcp = vfst.method()->bcp_from(vfst.bci());

     JvmtiExport::post_exception_throw(thread, vfst.method(), bcp, thread->exception_oop());

   }

 JRT_END

 // This is a helper to allow us to safepoint but allow the outer entry

 // to be safepoint free if we need to do an osr

 static nmethod* counter_overflow_helper(JavaThread* THREAD, int branch_bci, methodOopDesc* m) {

   nmethod* osr_nm = NULL;

   methodHandle method(THREAD, m);

   RegisterMap map(THREAD, false);

   frame fr =  THREAD->last_frame().sender(&map);

   nmethod* nm = (nmethod*) fr.cb();

   assert(nm!= NULL && nm->is_nmethod(), "Sanity check");

   methodHandle enclosing_method(THREAD, nm->method());

   CompLevel level = (CompLevel)nm->comp_level();

   int bci = InvocationEntryBci;

   if (branch_bci != InvocationEntryBci) {

     // Compute desination bci

     address pc = method()->code_base() + branch_bci;

     Bytecodes::Code branch = Bytecodes::code_at(method(), pc);

     int offset = 0;

     switch (branch) {

       case Bytecodes::_if_icmplt: case Bytecodes::_iflt:

       case Bytecodes::_if_icmpgt: case Bytecodes::_ifgt:

       case Bytecodes::_if_icmple: case Bytecodes::_ifle:

       case Bytecodes::_if_icmpge: case Bytecodes::_ifge:

       case Bytecodes::_if_icmpeq: case Bytecodes::_if_acmpeq: case Bytecodes::_ifeq:

       case Bytecodes::_if_icmpne: case Bytecodes::_if_acmpne: case Bytecodes::_ifne:

       case Bytecodes::_ifnull: case Bytecodes::_ifnonnull: case Bytecodes::_goto:

         offset = (int16_t)Bytes::get_Java_u2(pc + 1);

         break;

       case Bytecodes::_goto_w:

         offset = Bytes::get_Java_u4(pc + 1);

         break;

       default: ;

     }

     bci = branch_bci + offset;

   }

   osr_nm = CompilationPolicy::policy()->event(enclosing_method, method, branch_bci, bci, level, THREAD);

   return osr_nm;

 }

 JRT_BLOCK_ENTRY(address, Runtime1::counter_overflow(JavaThread* thread, int bci, methodOopDesc* method))

   nmethod* osr_nm;

   JRT_BLOCK

     osr_nm = counter_overflow_helper(thread, bci, method);

     if (osr_nm != NULL) {

       RegisterMap map(thread, false);

       frame fr =  thread->last_frame().sender(&map);

       Deoptimization::deoptimize_frame(thread, fr.id());

     }

   JRT_BLOCK_END

   return NULL;

 JRT_END

 extern void vm_exit(int code);

 // Enter this method from compiled code handler below. This is where we transition

 // to VM mode. This is done as a helper routine so that the method called directly

 // from compiled code does not have to transition to VM. This allows the entry

 // method to see if the nmethod that we have just looked up a handler for has

 // been deoptimized while we were in the vm. This simplifies the assembly code

 // cpu directories.

 //

 // We are entering here from exception stub (via the entry method below)

 // If there is a compiled exception handler in this method, we will continue there;

 // otherwise we will unwind the stack and continue at the caller of top frame method

 // Note: we enter in Java using a special JRT wrapper. This wrapper allows us to

 // control the area where we can allow a safepoint. After we exit the safepoint area we can

 // check to see if the handler we are going to return is now in a nmethod that has

 // been deoptimized. If that is the case we return the deopt blob

 // unpack_with_exception entry instead. This makes life for the exception blob easier

 // because making that same check and diverting is painful from assembly language.

 JRT_ENTRY_NO_ASYNC(static address, exception_handler_for_pc_helper(JavaThread* thread, oopDesc* ex, address pc, nmethod*& nm))

   // Reset method handle flag.

   thread->set_is_method_handle_return(false);

   Handle exception(thread, ex);

   nm = CodeCache::find_nmethod(pc);

   assert(nm != NULL, "this is not an nmethod");

   // Adjust the pc as needed/

   if (nm->is_deopt_pc(pc)) {

     RegisterMap map(thread, false);

     frame exception_frame = thread->last_frame().sender(&map);

     // if the frame isn't deopted then pc must not correspond to the caller of last_frame

     assert(exception_frame.is_deoptimized_frame(), "must be deopted");

     pc = exception_frame.pc();

   }

 #ifdef ASSERT

   assert(exception.not_null(), "NULL exceptions should be handled by throw_exception");

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

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

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

     if (ExitVMOnVerifyError) vm_exit(-1);

     ShouldNotReachHere();

   }

 #endif

   // Check the stack guard pages and reenable them if necessary and there is

   // enough space on the stack to do so.  Use fast exceptions only if the guard

   // pages are enabled.

   bool guard_pages_enabled = thread->stack_yellow_zone_enabled();

   if (!guard_pages_enabled) guard_pages_enabled = thread->reguard_stack();

   if (JvmtiExport::can_post_on_exceptions()) {

     // To ensure correct notification of exception catches and throws

     // we have to deoptimize here.  If we attempted to notify the

     // catches and throws during this exception lookup it's possible

     // we could deoptimize on the way out of the VM and end back in

     // the interpreter at the throw site.  This would result in double

     // notifications since the interpreter would also notify about

     // these same catches and throws as it unwound the frame.

     RegisterMap reg_map(thread);

     frame stub_frame = thread->last_frame();

     frame caller_frame = stub_frame.sender(&reg_map);

     // We don't really want to deoptimize the nmethod itself since we

     // can actually continue in the exception handler ourselves but I

     // don't see an easy way to have the desired effect.

     Deoptimization::deoptimize_frame(thread, caller_frame.id());

     assert(caller_is_deopted(), "Must be deoptimized");

     return SharedRuntime::deopt_blob()->unpack_with_exception_in_tls();

   }

   // ExceptionCache is used only for exceptions at call sites and not for implicit exceptions

   if (guard_pages_enabled) {

     address fast_continuation = nm->handler_for_exception_and_pc(exception, pc);

     if (fast_continuation != NULL) {

       // Set flag if return address is a method handle call site.

       thread->set_is_method_handle_return(nm->is_method_handle_return(pc));

       return fast_continuation;

     }

   }

   // If the stack guard pages are enabled, check whether there is a handler in

   // the current method.  Otherwise (guard pages disabled), force an unwind and

   // skip the exception cache update (i.e., just leave continuation==NULL).

   address continuation = NULL;

   if (guard_pages_enabled) {

     // New exception handling mechanism can support inlined methods

     // with exception handlers since the mappings are from PC to PC

     // debugging support

     // tracing

     if (TraceExceptions) {

       ttyLocker ttyl;

       ResourceMark rm;

       tty->print_cr("Exception <%s> (0x%x) thrown in compiled method <%s> at PC " PTR_FORMAT " for thread 0x%x",

                     exception->print_value_string(), (address)exception(), nm->method()->print_value_string(), pc, thread);

     }

     // for AbortVMOnException flag

     NOT_PRODUCT(Exceptions::debug_check_abort(exception));

     // Clear out the exception oop and pc since looking up an

     // exception handler can cause class loading, which might throw an

     // exception and those fields are expected to be clear during

     // normal bytecode execution.

     thread->set_exception_oop(NULL);

     thread->set_exception_pc(NULL);

     continuation = SharedRuntime::compute_compiled_exc_handler(nm, pc, exception, false, false);

     // If an exception was thrown during exception dispatch, the exception oop may have changed

     thread->set_exception_oop(exception());

     thread->set_exception_pc(pc);

     // the exception cache is used only by non-implicit exceptions

     if (continuation != NULL) {

       nm->add_handler_for_exception_and_pc(exception, pc, continuation);

     }

   }

   thread->set_vm_result(exception());

   // Set flag if return address is a method handle call site.

   thread->set_is_method_handle_return(nm->is_method_handle_return(pc));

   if (TraceExceptions) {

     ttyLocker ttyl;

     ResourceMark rm;

     tty->print_cr("Thread " PTR_FORMAT " continuing at PC " PTR_FORMAT " for exception thrown at PC " PTR_FORMAT,

                   thread, continuation, pc);

   }

   return continuation;

 JRT_END

 // Enter this method from compiled code only if there is a Java exception handler

 // in the method handling the exception.

 // We are entering here from exception stub. We don't do a normal VM transition here.

 // We do it in a helper. This is so we can check to see if the nmethod we have just

 // searched for an exception handler has been deoptimized in the meantime.

 address Runtime1::exception_handler_for_pc(JavaThread* thread) {

   oop exception = thread->exception_oop();

   address pc = thread->exception_pc();

   // Still in Java mode

   DEBUG_ONLY(ResetNoHandleMark rnhm);

   nmethod* nm = NULL;

   address continuation = NULL;

   {

     // Enter VM mode by calling the helper

     ResetNoHandleMark rnhm;

     continuation = exception_handler_for_pc_helper(thread, exception, pc, nm);

   }

   // Back in JAVA, use no oops DON'T safepoint

   // Now check to see if the nmethod we were called from is now deoptimized.

   // If so we must return to the deopt blob and deoptimize the nmethod

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

     continuation = SharedRuntime::deopt_blob()->unpack_with_exception_in_tls();

   }

   assert(continuation != NULL, "no handler found");

   return continuation;

 }

 JRT_ENTRY(void, Runtime1::throw_range_check_exception(JavaThread* thread, int index))

   NOT_PRODUCT(_throw_range_check_exception_count++;)

   Events::log("throw_range_check");

   char message[jintAsStringSize];

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

   SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), message);

 JRT_END

 JRT_ENTRY(void, Runtime1::throw_index_exception(JavaThread* thread, int index))

   NOT_PRODUCT(_throw_index_exception_count++;)

   Events::log("throw_index");

   char message[16];

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

   SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IndexOutOfBoundsException(), message);

 JRT_END

 JRT_ENTRY(void, Runtime1::throw_div0_exception(JavaThread* thread))

   NOT_PRODUCT(_throw_div0_exception_count++;)

   SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero");

 JRT_END

 JRT_ENTRY(void, Runtime1::throw_null_pointer_exception(JavaThread* thread))

   NOT_PRODUCT(_throw_null_pointer_exception_count++;)

   SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());

 JRT_END

 JRT_ENTRY(void, Runtime1::throw_class_cast_exception(JavaThread* thread, oopDesc* object))

   NOT_PRODUCT(_throw_class_cast_exception_count++;)

   ResourceMark rm(thread);

   char* message = SharedRuntime::generate_class_cast_message(

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

   SharedRuntime::throw_and_post_jvmti_exception(

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

 JRT_END

 JRT_ENTRY(void, Runtime1::throw_incompatible_class_change_error(JavaThread* thread))

   NOT_PRODUCT(_throw_incompatible_class_change_error_count++;)

   ResourceMark rm(thread);

   SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IncompatibleClassChangeError());

 JRT_END

 JRT_ENTRY_NO_ASYNC(void, Runtime1::monitorenter(JavaThread* thread, oopDesc* obj, BasicObjectLock* lock))

   NOT_PRODUCT(_monitorenter_slowcase_cnt++;)

   if (PrintBiasedLockingStatistics) {

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

   }

   Handle h_obj(thread, obj);

   assert(h_obj()->is_oop(), "must be NULL or an object");

   if (UseBiasedLocking) {

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

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

   } else {

     if (UseFastLocking) {

       // When using fast locking, the compiled code has already tried the fast case

       assert(obj == lock->obj(), "must match");

       ObjectSynchronizer::slow_enter(h_obj, lock->lock(), THREAD);

     } else {

       lock->set_obj(obj);

       ObjectSynchronizer::fast_enter(h_obj, lock->lock(), false, THREAD);

     }

   }

 JRT_END

 JRT_LEAF(void, Runtime1::monitorexit(JavaThread* thread, BasicObjectLock* lock))

   NOT_PRODUCT(_monitorexit_slowcase_cnt++;)

   assert(thread == JavaThread::current(), "threads must correspond");

   assert(thread->last_Java_sp(), "last_Java_sp must be set");

   // monitorexit is non-blocking (leaf routine) => no exceptions can be thrown

   EXCEPTION_MARK;

   oop obj = lock->obj();

   assert(obj->is_oop(), "must be NULL or an object");

   if (UseFastLocking) {

     // When using fast locking, the compiled code has already tried the fast case

     ObjectSynchronizer::slow_exit(obj, lock->lock(), THREAD);

   } else {

     ObjectSynchronizer::fast_exit(obj, lock->lock(), THREAD);

   }

 JRT_END

 static klassOop resolve_field_return_klass(methodHandle caller, int bci, TRAPS) {

   Bytecode_field field_access(caller, bci);

   // This can be static or non-static field access

   Bytecodes::Code code       = field_access.code();

   // We must load class, initialize class and resolvethe field

   FieldAccessInfo result; // initialize class if needed

   constantPoolHandle constants(THREAD, caller->constants());

   LinkResolver::resolve_field(result, constants, field_access.index(), Bytecodes::java_code(code), false, CHECK_NULL);

   return result.klass()();

 }

 //

 // This routine patches sites where a class wasn't loaded or

 // initialized at the time the code was generated.  It handles

 // references to classes, fields and forcing of initialization.  Most

 // of the cases are straightforward and involving simply forcing

 // resolution of a class, rewriting the instruction stream with the

 // needed constant and replacing the call in this function with the

 // patched code.  The case for static field is more complicated since

 // the thread which is in the process of initializing a class can

 // access it's static fields but other threads can't so the code

 // either has to deoptimize when this case is detected or execute a

 // check that the current thread is the initializing thread.  The

 // current

 //

 // Patches basically look like this:

 //

 //

 // patch_site: jmp patch stub     ;; will be patched

 // continue:   ...

 //             ...

 //             ...

 //             ...

 //

 // They have a stub which looks like this:

 //

 //             ;; patch body

 //             movl <const>, reg           (for class constants)

 //        <or> movl [reg1 + <const>], reg  (for field offsets)

 //        <or> movl reg, [reg1 + <const>]  (for field offsets)

 //             <being_init offset> <bytes to copy> <bytes to skip>

 // patch_stub: call Runtime1::patch_code (through a runtime stub)

 //             jmp patch_site

 //

 //

 // A normal patch is done by rewriting the patch body, usually a move,

 // and then copying it into place over top of the jmp instruction

 // being careful to flush caches and doing it in an MP-safe way.  The

 // constants following the patch body are used to find various pieces

 // of the patch relative to the call site for Runtime1::patch_code.

 // The case for getstatic and putstatic is more complicated because

 // getstatic and putstatic have special semantics when executing while

 // the class is being initialized.  getstatic/putstatic on a class

 // which is being_initialized may be executed by the initializing

 // thread but other threads have to block when they execute it.  This

 // is accomplished in compiled code by executing a test of the current

 // thread against the initializing thread of the class.  It's emitted

 // as boilerplate in their stub which allows the patched code to be

 // executed before it's copied back into the main body of the nmethod.

 //

 // being_init: get_thread(<tmp reg>

 //             cmpl [reg1 + <init_thread_offset>], <tmp reg>

 //             jne patch_stub

 //             movl [reg1 + <const>], reg  (for field offsets)  <or>

 //             movl reg, [reg1 + <const>]  (for field offsets)

 //             jmp continue

 //             <being_init offset> <bytes to copy> <bytes to skip>

 // patch_stub: jmp Runtim1::patch_code (through a runtime stub)

 //             jmp patch_site

 //

 // If the class is being initialized the patch body is rewritten and

 // the patch site is rewritten to jump to being_init, instead of

 // patch_stub.  Whenever this code is executed it checks the current

 // thread against the intializing thread so other threads will enter

 // the runtime and end up blocked waiting the class to finish

 // initializing inside the calls to resolve_field below.  The

 // initializing class will continue on it's way.  Once the class is

 // fully_initialized, the intializing_thread of the class becomes

 // NULL, so the next thread to execute this code will fail the test,

 // call into patch_code and complete the patching process by copying

 // the patch body back into the main part of the nmethod and resume

 // executing.

 //

 //

 JRT_ENTRY(void, Runtime1::patch_code(JavaThread* thread, Runtime1::StubID stub_id ))

   NOT_PRODUCT(_patch_code_slowcase_cnt++;)

   ResourceMark rm(thread);

   RegisterMap reg_map(thread, false);

   frame runtime_frame = thread->last_frame();

   frame caller_frame = runtime_frame.sender(&reg_map);

   // last java frame on stack

   vframeStream vfst(thread, true);

   assert(!vfst.at_end(), "Java frame must exist");

   methodHandle caller_method(THREAD, vfst.method());

   // Note that caller_method->code() may not be same as caller_code because of OSR's

   // Note also that in the presence of inlining it is not guaranteed

   // that caller_method() == caller_code->method()

   int bci = vfst.bci();

   Events::log("patch_code @ " INTPTR_FORMAT , caller_frame.pc());

   Bytecodes::Code code = caller_method()->java_code_at(bci);

 #ifndef PRODUCT

   // this is used by assertions in the access_field_patching_id

   BasicType patch_field_type = T_ILLEGAL;

 #endif // PRODUCT

   bool deoptimize_for_volatile = false;

   int patch_field_offset = -1;

   KlassHandle init_klass(THREAD, klassOop(NULL)); // klass needed by access_field_patching code

   Handle load_klass(THREAD, NULL);                // oop needed by load_klass_patching code

   if (stub_id == Runtime1::access_field_patching_id) {

     Bytecode_field field_access(caller_method, bci);

     FieldAccessInfo result; // initialize class if needed

     Bytecodes::Code code = field_access.code();

     constantPoolHandle constants(THREAD, caller_method->constants());

     LinkResolver::resolve_field(result, constants, field_access.index(), Bytecodes::java_code(code), false, CHECK);

     patch_field_offset = result.field_offset();

     // If we're patching a field which is volatile then at compile it

     // must not have been know to be volatile, so the generated code

     // isn't correct for a volatile reference.  The nmethod has to be

     // deoptimized so that the code can be regenerated correctly.

     // This check is only needed for access_field_patching since this

     // is the path for patching field offsets.  load_klass is only

     // used for patching references to oops which don't need special

     // handling in the volatile case.

     deoptimize_for_volatile = result.access_flags().is_volatile();

 #ifndef PRODUCT

     patch_field_type = result.field_type();

 #endif

   } else if (stub_id == Runtime1::load_klass_patching_id) {

     oop k;

     switch (code) {

       case Bytecodes::_putstatic:

       case Bytecodes::_getstatic:

         { klassOop klass = resolve_field_return_klass(caller_method, bci, CHECK);

           // Save a reference to the class that has to be checked for initialization

           init_klass = KlassHandle(THREAD, klass);

           k = klass->java_mirror();

         }

         break;

       case Bytecodes::_new:

         { Bytecode_new bnew(caller_method(), caller_method->bcp_from(bci));

           k = caller_method->constants()->klass_at(bnew.index(), CHECK);

         }

         break;

       case Bytecodes::_multianewarray:

         { Bytecode_multianewarray mna(caller_method(), caller_method->bcp_from(bci));

           k = caller_method->constants()->klass_at(mna.index(), CHECK);

         }

         break;

       case Bytecodes::_instanceof:

         { Bytecode_instanceof io(caller_method(), caller_method->bcp_from(bci));

           k = caller_method->constants()->klass_at(io.index(), CHECK);

         }

         break;

       case Bytecodes::_checkcast:

         { Bytecode_checkcast cc(caller_method(), caller_method->bcp_from(bci));

           k = caller_method->constants()->klass_at(cc.index(), CHECK);

         }

         break;

       case Bytecodes::_anewarray:

         { Bytecode_anewarray anew(caller_method(), caller_method->bcp_from(bci));

           klassOop ek = caller_method->constants()->klass_at(anew.index(), CHECK);

           k = Klass::cast(ek)->array_klass(CHECK);

         }

         break;

       case Bytecodes::_ldc:

       case Bytecodes::_ldc_w:

         {

           Bytecode_loadconstant cc(caller_method, bci);

           k = cc.resolve_constant(CHECK);

           assert(k != NULL && !k->is_klass(), "must be class mirror or other Java constant");

         }

         break;

       default: Unimplemented();

     }

     // convert to handle

     load_klass = Handle(THREAD, k);

   } else {

     ShouldNotReachHere();

   }

   if (deoptimize_for_volatile) {

     // At compile time we assumed the field wasn't volatile but after

     // loading it turns out it was volatile so we have to throw the

     // compiled code out and let it be regenerated.

     if (TracePatching) {

       tty->print_cr("Deoptimizing for patching volatile field reference");

     }

     // It's possible the nmethod was invalidated in the last

     // safepoint, but if it's still alive then make it not_entrant.

     nmethod* nm = CodeCache::find_nmethod(caller_frame.pc());

     if (nm != NULL) {

       nm->make_not_entrant();

     }

     Deoptimization::deoptimize_frame(thread, caller_frame.id());

     // Return to the now deoptimized frame.

   }

   // If we are patching in a non-perm oop, make sure the nmethod

   // is on the right list.

   if (ScavengeRootsInCode && load_klass.not_null() && load_klass->is_scavengable()) {

     MutexLockerEx ml_code (CodeCache_lock, Mutex::_no_safepoint_check_flag);

     nmethod* nm = CodeCache::find_nmethod(caller_frame.pc());

     guarantee(nm != NULL, "only nmethods can contain non-perm oops");

     if (!nm->on_scavenge_root_list())

       CodeCache::add_scavenge_root_nmethod(nm);

   }

   // Now copy code back

   {

     MutexLockerEx ml_patch (Patching_lock, Mutex::_no_safepoint_check_flag);

     //

     // Deoptimization may have happened while we waited for the lock.

     // In that case we don't bother to do any patching we just return

     // and let the deopt happen

     if (!caller_is_deopted()) {

       NativeGeneralJump* jump = nativeGeneralJump_at(caller_frame.pc());

       address instr_pc = jump->jump_destination();

       NativeInstruction* ni = nativeInstruction_at(instr_pc);

       if (ni->is_jump() ) {

         // the jump has not been patched yet

         // The jump destination is slow case and therefore not part of the stubs

         // (stubs are only for StaticCalls)

         // format of buffer

         //    ....

         //    instr byte 0     <-- copy_buff

         //    instr byte 1

         //    ..

         //    instr byte n-1

         //      n

         //    ....             <-- call destination

         address stub_location = caller_frame.pc() + PatchingStub::patch_info_offset();

         unsigned char* byte_count = (unsigned char*) (stub_location - 1);

         unsigned char* byte_skip = (unsigned char*) (stub_location - 2);

         unsigned char* being_initialized_entry_offset = (unsigned char*) (stub_location - 3);

         address copy_buff = stub_location - *byte_skip - *byte_count;

         address being_initialized_entry = stub_location - *being_initialized_entry_offset;

         if (TracePatching) {

           tty->print_cr(" Patching %s at bci %d at address 0x%x  (%s)", Bytecodes::name(code), bci,

                         instr_pc, (stub_id == Runtime1::access_field_patching_id) ? "field" : "klass");

           nmethod* caller_code = CodeCache::find_nmethod(caller_frame.pc());

           assert(caller_code != NULL, "nmethod not found");

           // NOTE we use pc() not original_pc() because we already know they are

           // identical otherwise we'd have never entered this block of code

           OopMap* map = caller_code->oop_map_for_return_address(caller_frame.pc());

           assert(map != NULL, "null check");

           map->print();

           tty->cr();

           Disassembler::decode(copy_buff, copy_buff + *byte_count, tty);

         }

         // depending on the code below, do_patch says whether to copy the patch body back into the nmethod

         bool do_patch = true;

         if (stub_id == Runtime1::access_field_patching_id) {

           // The offset may not be correct if the class was not loaded at code generation time.

           // Set it now.

           NativeMovRegMem* n_move = nativeMovRegMem_at(copy_buff);

           assert(n_move->offset() == 0 || (n_move->offset() == 4 && (patch_field_type == T_DOUBLE || patch_field_type == T_LONG)), "illegal offset for type");

           assert(patch_field_offset >= 0, "illegal offset");

           n_move->add_offset_in_bytes(patch_field_offset);

         } else if (stub_id == Runtime1::load_klass_patching_id) {

           // If a getstatic or putstatic is referencing a klass which

           // isn't fully initialized, the patch body isn't copied into

           // place until initialization is complete.  In this case the

           // patch site is setup so that any threads besides the

           // initializing thread are forced to come into the VM and

           // block.

           do_patch = (code != Bytecodes::_getstatic && code != Bytecodes::_putstatic) ||

                      instanceKlass::cast(init_klass())->is_initialized();

           NativeGeneralJump* jump = nativeGeneralJump_at(instr_pc);

           if (jump->jump_destination() == being_initialized_entry) {

             assert(do_patch == true, "initialization must be complete at this point");

           } else {

             // patch the instruction <move reg, klass>

             NativeMovConstReg* n_copy = nativeMovConstReg_at(copy_buff);

             assert(n_copy->data() == 0 ||

                    n_copy->data() == (intptr_t)Universe::non_oop_word(),

                    "illegal init value");

             assert(load_klass() != NULL, "klass not set");

             n_copy->set_data((intx) (load_klass()));

             if (TracePatching) {

               Disassembler::decode(copy_buff, copy_buff + *byte_count, tty);

             }

 #if defined(SPARC) || defined(PPC)

             // Update the oop location in the nmethod with the proper

             // oop.  When the code was generated, a NULL was stuffed

             // in the oop table and that table needs to be update to

             // have the right value.  On intel the value is kept

             // directly in the instruction instead of in the oop

             // table, so set_data above effectively updated the value.

             nmethod* nm = CodeCache::find_nmethod(instr_pc);

             assert(nm != NULL, "invalid nmethod_pc");

             RelocIterator oops(nm, copy_buff, copy_buff + 1);

             bool found = false;

             while (oops.next() && !found) {

               if (oops.type() == relocInfo::oop_type) {

                 oop_Relocation* r = oops.oop_reloc();

                 oop* oop_adr = r->oop_addr();

                 *oop_adr = load_klass();

                 r->fix_oop_relocation();

                 found = true;

               }

             }

             assert(found, "the oop must exist!");

 #endif

           }

         } else {

           ShouldNotReachHere();

         }

         if (do_patch) {

           // replace instructions

           // first replace the tail, then the call

 #ifdef ARM

           if(stub_id == Runtime1::load_klass_patching_id && !VM_Version::supports_movw()) {

             nmethod* nm = CodeCache::find_nmethod(instr_pc);

             oop* oop_addr = NULL;

             assert(nm != NULL, "invalid nmethod_pc");

             RelocIterator oops(nm, copy_buff, copy_buff + 1);

             while (oops.next()) {

               if (oops.type() == relocInfo::oop_type) {

                 oop_Relocation* r = oops.oop_reloc();

                 oop_addr = r->oop_addr();

                 break;

               }

             }

             assert(oop_addr != NULL, "oop relocation must exist");

             copy_buff -= *byte_count;

             NativeMovConstReg* n_copy2 = nativeMovConstReg_at(copy_buff);

             n_copy2->set_pc_relative_offset((address)oop_addr, instr_pc);

           }

 #endif

           for (int i = NativeCall::instruction_size; i < *byte_count; i++) {

             address ptr = copy_buff + i;

             int a_byte = (*ptr) & 0xFF;

             address dst = instr_pc + i;

             *(unsigned char*)dst = (unsigned char) a_byte;

           }

           ICache::invalidate_range(instr_pc, *byte_count);

           NativeGeneralJump::replace_mt_safe(instr_pc, copy_buff);

           if (stub_id == Runtime1::load_klass_patching_id) {

             // update relocInfo to oop

             nmethod* nm = CodeCache::find_nmethod(instr_pc);

             assert(nm != NULL, "invalid nmethod_pc");

             // The old patch site is now a move instruction so update

             // the reloc info so that it will get updated during

             // future GCs.

             RelocIterator iter(nm, (address)instr_pc, (address)(instr_pc + 1));

             relocInfo::change_reloc_info_for_address(&iter, (address) instr_pc,

                                                      relocInfo::none, relocInfo::oop_type);

 #ifdef SPARC

             // Sparc takes two relocations for an oop so update the second one.

             address instr_pc2 = instr_pc + NativeMovConstReg::add_offset;

             RelocIterator iter2(nm, instr_pc2, instr_pc2 + 1);

             relocInfo::change_reloc_info_for_address(&iter2, (address) instr_pc2,

                                                      relocInfo::none, relocInfo::oop_type);

 #endif

 #ifdef PPC

           { address instr_pc2 = instr_pc + NativeMovConstReg::lo_offset;

             RelocIterator iter2(nm, instr_pc2, instr_pc2 + 1);

             relocInfo::change_reloc_info_for_address(&iter2, (address) instr_pc2, relocInfo::none, relocInfo::oop_type);

           }

 #endif

           }

         } else {

           ICache::invalidate_range(copy_buff, *byte_count);

           NativeGeneralJump::insert_unconditional(instr_pc, being_initialized_entry);

         }

       }

     }

   }

 JRT_END

 //

 // Entry point for compiled code. We want to patch a nmethod.

 // We don't do a normal VM transition here because we want to

 // know after the patching is complete and any safepoint(s) are taken

 // if the calling nmethod was deoptimized. We do this by calling a

 // helper method which does the normal VM transition and when it

 // completes we can check for deoptimization. This simplifies the

 // assembly code in the cpu directories.

 //

 int Runtime1::move_klass_patching(JavaThread* thread) {

 //

 // NOTE: we are still in Java

 //

   Thread* THREAD = thread;

   debug_only(NoHandleMark nhm;)

   {

     // Enter VM mode

     ResetNoHandleMark rnhm;

     patch_code(thread, load_klass_patching_id);

   }

   // Back in JAVA, use no oops DON'T safepoint

   // Return true if calling code is deoptimized

   return caller_is_deopted();

 }

 //

 // Entry point for compiled code. We want to patch a nmethod.

 // We don't do a normal VM transition here because we want to

 // know after the patching is complete and any safepoint(s) are taken

 // if the calling nmethod was deoptimized. We do this by calling a

 // helper method which does the normal VM transition and when it

 // completes we can check for deoptimization. This simplifies the

 // assembly code in the cpu directories.

 //

 int Runtime1::access_field_patching(JavaThread* thread) {

 //

 // NOTE: we are still in Java

 //

   Thread* THREAD = thread;

   debug_only(NoHandleMark nhm;)

   {

     // Enter VM mode

     ResetNoHandleMark rnhm;

     patch_code(thread, access_field_patching_id);

   }

   // Back in JAVA, use no oops DON'T safepoint

   // Return true if calling code is deoptimized

   return caller_is_deopted();

 JRT_END

 JRT_LEAF(void, Runtime1::trace_block_entry(jint block_id))

   // for now we just print out the block id

   tty->print("%d ", block_id);

 JRT_END

 // Array copy return codes.

 enum {

   ac_failed = -1, // arraycopy failed

   ac_ok = 0       // arraycopy succeeded

 };

 // Below length is the # elements copied.

 template <class T> int obj_arraycopy_work(oopDesc* src, T* src_addr,

                                           oopDesc* dst, T* dst_addr,

                                           int length) {

   // For performance reasons, we assume we are using a card marking write

   // barrier. The assert will fail if this is not the case.

   // Note that we use the non-virtual inlineable variant of write_ref_array.

   BarrierSet* bs = Universe::heap()->barrier_set();

   assert(bs->has_write_ref_array_opt(), "Barrier set must have ref array opt");

   assert(bs->has_write_ref_array_pre_opt(), "For pre-barrier as well.");

   if (src == dst) {

     // same object, no check

     bs->write_ref_array_pre(dst_addr, length);

     Copy::conjoint_oops_atomic(src_addr, dst_addr, length);

     bs->write_ref_array((HeapWord*)dst_addr, length);

     return ac_ok;

   } else {

     klassOop bound = objArrayKlass::cast(dst->klass())->element_klass();

     klassOop stype = objArrayKlass::cast(src->klass())->element_klass();

     if (stype == bound || Klass::cast(stype)->is_subtype_of(bound)) {

       // Elements are guaranteed to be subtypes, so no check necessary

       bs->write_ref_array_pre(dst_addr, length);

       Copy::conjoint_oops_atomic(src_addr, dst_addr, length);

       bs->write_ref_array((HeapWord*)dst_addr, length);

       return ac_ok;

     }

   }

   return ac_failed;

 }

 // fast and direct copy of arrays; returning -1, means that an exception may be thrown

 // and we did not copy anything

 JRT_LEAF(int, Runtime1::arraycopy(oopDesc* src, int src_pos, oopDesc* dst, int dst_pos, int length))

 #ifndef PRODUCT

   _generic_arraycopy_cnt++;        // Slow-path oop array copy

 #endif

   if (src == NULL || dst == NULL || src_pos < 0 || dst_pos < 0 || length < 0) return ac_failed;

   if (!dst->is_array() || !src->is_array()) return ac_failed;

   if ((unsigned int) arrayOop(src)->length() < (unsigned int)src_pos + (unsigned int)length) return ac_failed;

   if ((unsigned int) arrayOop(dst)->length() < (unsigned int)dst_pos + (unsigned int)length) return ac_failed;

   if (length == 0) return ac_ok;

   if (src->is_typeArray()) {

     const klassOop klass_oop = src->klass();

     if (klass_oop != dst->klass()) return ac_failed;

     typeArrayKlass* klass = typeArrayKlass::cast(klass_oop);

     const int l2es = klass->log2_element_size();

     const int ihs = klass->array_header_in_bytes() / wordSize;

     char* src_addr = (char*) ((oopDesc**)src + ihs) + (src_pos << l2es);

     char* dst_addr = (char*) ((oopDesc**)dst + ihs) + (dst_pos << l2es);

     // Potential problem: memmove is not guaranteed to be word atomic

     // Revisit in Merlin

     memmove(dst_addr, src_addr, length << l2es);

     return ac_ok;

   } else if (src->is_objArray() && dst->is_objArray()) {

     if (UseCompressedOops) {

       narrowOop *src_addr  = objArrayOop(src)->obj_at_addr<narrowOop>(src_pos);

       narrowOop *dst_addr  = objArrayOop(dst)->obj_at_addr<narrowOop>(dst_pos);

       return obj_arraycopy_work(src, src_addr, dst, dst_addr, length);

     } else {

       oop *src_addr  = objArrayOop(src)->obj_at_addr<oop>(src_pos);

       oop *dst_addr  = objArrayOop(dst)->obj_at_addr<oop>(dst_pos);

       return obj_arraycopy_work(src, src_addr, dst, dst_addr, length);

     }

   }

   return ac_failed;

 JRT_END

 JRT_LEAF(void, Runtime1::primitive_arraycopy(HeapWord* src, HeapWord* dst, int length))

 #ifndef PRODUCT

   _primitive_arraycopy_cnt++;

 #endif

   if (length == 0) return;

   // Not guaranteed to be word atomic, but that doesn't matter

   // for anything but an oop array, which is covered by oop_arraycopy.

   Copy::conjoint_jbytes(src, dst, length);

 JRT_END

 JRT_LEAF(void, Runtime1::oop_arraycopy(HeapWord* src, HeapWord* dst, int num))

 #ifndef PRODUCT

   _oop_arraycopy_cnt++;

 #endif

   if (num == 0) return;

   BarrierSet* bs = Universe::heap()->barrier_set();

   assert(bs->has_write_ref_array_opt(), "Barrier set must have ref array opt");

   assert(bs->has_write_ref_array_pre_opt(), "For pre-barrier as well.");

   if (UseCompressedOops) {

     bs->write_ref_array_pre((narrowOop*)dst, num);

     Copy::conjoint_oops_atomic((narrowOop*) src, (narrowOop*) dst, num);

   } else {

     bs->write_ref_array_pre((oop*)dst, num);

     Copy::conjoint_oops_atomic((oop*) src, (oop*) dst, num);

   }

   bs->write_ref_array(dst, num);

 JRT_END

 #ifndef PRODUCT

 void Runtime1::print_statistics() {

   tty->print_cr("C1 Runtime statistics:");

   tty->print_cr(" _resolve_invoke_virtual_cnt:     %d", SharedRuntime::_resolve_virtual_ctr);

   tty->print_cr(" _resolve_invoke_opt_virtual_cnt: %d", SharedRuntime::_resolve_opt_virtual_ctr);

   tty->print_cr(" _resolve_invoke_static_cnt:      %d", SharedRuntime::_resolve_static_ctr);

   tty->print_cr(" _handle_wrong_method_cnt:        %d", SharedRuntime::_wrong_method_ctr);

   tty->print_cr(" _ic_miss_cnt:                    %d", SharedRuntime::_ic_miss_ctr);

   tty->print_cr(" _generic_arraycopy_cnt:          %d", _generic_arraycopy_cnt);

   tty->print_cr(" _generic_arraycopystub_cnt:      %d", _generic_arraycopystub_cnt);

   tty->print_cr(" _byte_arraycopy_cnt:             %d", _byte_arraycopy_cnt);

   tty->print_cr(" _short_arraycopy_cnt:            %d", _short_arraycopy_cnt);

   tty->print_cr(" _int_arraycopy_cnt:              %d", _int_arraycopy_cnt);

   tty->print_cr(" _long_arraycopy_cnt:             %d", _long_arraycopy_cnt);

   tty->print_cr(" _primitive_arraycopy_cnt:        %d", _primitive_arraycopy_cnt);

   tty->print_cr(" _oop_arraycopy_cnt (C):          %d", Runtime1::_oop_arraycopy_cnt);

   tty->print_cr(" _oop_arraycopy_cnt (stub):       %d", _oop_arraycopy_cnt);

   tty->print_cr(" _arraycopy_slowcase_cnt:         %d", _arraycopy_slowcase_cnt);

   tty->print_cr(" _arraycopy_checkcast_cnt:        %d", _arraycopy_checkcast_cnt);

   tty->print_cr(" _arraycopy_checkcast_attempt_cnt:%d", _arraycopy_checkcast_attempt_cnt);

   tty->print_cr(" _new_type_array_slowcase_cnt:    %d", _new_type_array_slowcase_cnt);

   tty->print_cr(" _new_object_array_slowcase_cnt:  %d", _new_object_array_slowcase_cnt);

   tty->print_cr(" _new_instance_slowcase_cnt:      %d", _new_instance_slowcase_cnt);

   tty->print_cr(" _new_multi_array_slowcase_cnt:   %d", _new_multi_array_slowcase_cnt);

   tty->print_cr(" _monitorenter_slowcase_cnt:      %d", _monitorenter_slowcase_cnt);

   tty->print_cr(" _monitorexit_slowcase_cnt:       %d", _monitorexit_slowcase_cnt);

   tty->print_cr(" _patch_code_slowcase_cnt:        %d", _patch_code_slowcase_cnt);

   tty->print_cr(" _throw_range_check_exception_count:            %d:", _throw_range_check_exception_count);

   tty->print_cr(" _throw_index_exception_count:                  %d:", _throw_index_exception_count);

   tty->print_cr(" _throw_div0_exception_count:                   %d:", _throw_div0_exception_count);

   tty->print_cr(" _throw_null_pointer_exception_count:           %d:", _throw_null_pointer_exception_count);

   tty->print_cr(" _throw_class_cast_exception_count:             %d:", _throw_class_cast_exception_count);

   tty->print_cr(" _throw_incompatible_class_change_error_count:  %d:", _throw_incompatible_class_change_error_count);

   tty->print_cr(" _throw_array_store_exception_count:            %d:", _throw_array_store_exception_count);

   tty->print_cr(" _throw_count:                                  %d:", _throw_count);

   SharedRuntime::print_ic_miss_histogram();

   tty->cr();

 }

 #endif // PRODUCT