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

 /*

  * Copyright (c) 1998, 2014, Oracle and/or its affiliates. All rights reserved.

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

  *

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

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

  * published by the Free Software Foundation.

  *

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

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

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

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

  * accompanied this code).

  *

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

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

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

  *

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

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

  * questions.

  *

  */

 #include "precompiled.hpp"

 #include "classfile/systemDictionary.hpp"

 #include "classfile/vmSymbols.hpp"

 #include "code/compiledIC.hpp"

 #include "code/icBuffer.hpp"

 #include "code/nmethod.hpp"

 #include "code/pcDesc.hpp"

 #include "code/scopeDesc.hpp"

 #include "code/vtableStubs.hpp"

 #include "compiler/compileBroker.hpp"

 #include "compiler/compilerOracle.hpp"

 #include "compiler/oopMap.hpp"

 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"

 #include "gc_implementation/g1/heapRegion.hpp"

 #include "gc_interface/collectedHeap.hpp"

 #include "interpreter/bytecode.hpp"

 #include "interpreter/interpreter.hpp"

 #include "interpreter/linkResolver.hpp"

 #include "memory/barrierSet.hpp"

 #include "memory/gcLocker.inline.hpp"

 #include "memory/oopFactory.hpp"

 #include "oops/objArrayKlass.hpp"

 #include "oops/oop.inline.hpp"

 #include "opto/addnode.hpp"

 #include "opto/callnode.hpp"

 #include "opto/cfgnode.hpp"

 #include "opto/connode.hpp"

 #include "opto/graphKit.hpp"

 #include "opto/machnode.hpp"

 #include "opto/matcher.hpp"

 #include "opto/memnode.hpp"

 #include "opto/mulnode.hpp"

 #include "opto/runtime.hpp"

 #include "opto/subnode.hpp"

 #include "runtime/fprofiler.hpp"

 #include "runtime/handles.inline.hpp"

 #include "runtime/interfaceSupport.hpp"

 #include "runtime/javaCalls.hpp"

 #include "runtime/sharedRuntime.hpp"

 #include "runtime/signature.hpp"

 #include "runtime/threadCritical.hpp"

 #include "runtime/vframe.hpp"

 #include "runtime/vframeArray.hpp"

 #include "runtime/vframe_hp.hpp"

 #include "utilities/copy.hpp"

 #include "utilities/preserveException.hpp"

 #ifdef TARGET_ARCH_MODEL_x86_32

 # include "adfiles/ad_x86_32.hpp"

 #endif

 #ifdef TARGET_ARCH_MODEL_x86_64

 # include "adfiles/ad_x86_64.hpp"

 #endif

 #ifdef TARGET_ARCH_MODEL_sparc

 # include "adfiles/ad_sparc.hpp"

 #endif

 #ifdef TARGET_ARCH_MODEL_zero

 # include "adfiles/ad_zero.hpp"

 #endif

 #ifdef TARGET_ARCH_MODEL_arm

 # include "adfiles/ad_arm.hpp"

 #endif

 #ifdef TARGET_ARCH_MODEL_ppc_32

 # include "adfiles/ad_ppc_32.hpp"

 #endif

 #ifdef TARGET_ARCH_MODEL_ppc_64

 # include "adfiles/ad_ppc_64.hpp"

 #endif

 // For debugging purposes:

 //  To force FullGCALot inside a runtime function, add the following two lines

 //

 //  Universe::release_fullgc_alot_dummy();

 //  MarkSweep::invoke(0, "Debugging");

 //

 // At command line specify the parameters: -XX:+FullGCALot -XX:FullGCALotStart=100000000

 // Compiled code entry points

 address OptoRuntime::_new_instance_Java                           = NULL;

 address OptoRuntime::_new_array_Java                              = NULL;

 address OptoRuntime::_new_array_nozero_Java                       = NULL;

 address OptoRuntime::_multianewarray2_Java                        = NULL;

 address OptoRuntime::_multianewarray3_Java                        = NULL;

 address OptoRuntime::_multianewarray4_Java                        = NULL;

 address OptoRuntime::_multianewarray5_Java                        = NULL;

 address OptoRuntime::_multianewarrayN_Java                        = NULL;

 address OptoRuntime::_g1_wb_pre_Java                              = NULL;

 address OptoRuntime::_g1_wb_post_Java                             = NULL;

 address OptoRuntime::_vtable_must_compile_Java                    = NULL;

 address OptoRuntime::_complete_monitor_locking_Java               = NULL;

 address OptoRuntime::_rethrow_Java                                = NULL;

 address OptoRuntime::_slow_arraycopy_Java                         = NULL;

 address OptoRuntime::_register_finalizer_Java                     = NULL;

 # ifdef ENABLE_ZAP_DEAD_LOCALS

 address OptoRuntime::_zap_dead_Java_locals_Java                   = NULL;

 address OptoRuntime::_zap_dead_native_locals_Java                 = NULL;

 # endif

 ExceptionBlob* OptoRuntime::_exception_blob;

 // This should be called in an assertion at the start of OptoRuntime routines

 // which are entered from compiled code (all of them)

 #ifdef ASSERT

 static bool check_compiled_frame(JavaThread* thread) {

   assert(thread->last_frame().is_runtime_frame(), "cannot call runtime directly from compiled code");

   RegisterMap map(thread, false);

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

   assert(caller.is_compiled_frame(), "not being called from compiled like code");

   return true;

 }

 #endif // ASSERT

 #define gen(env, var, type_func_gen, c_func, fancy_jump, pass_tls, save_arg_regs, return_pc) \

   var = generate_stub(env, type_func_gen, CAST_FROM_FN_PTR(address, c_func), #var, fancy_jump, pass_tls, save_arg_regs, return_pc); \

   if (var == NULL) { return false; }

 bool OptoRuntime::generate(ciEnv* env) {

   generate_exception_blob();

   // Note: tls: Means fetching the return oop out of the thread-local storage

   //

   //   variable/name                       type-function-gen              , runtime method                  ,fncy_jp, tls,save_args,retpc

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

   gen(env, _new_instance_Java              , new_instance_Type            , new_instance_C                  ,    0 , true , false, false);

   gen(env, _new_array_Java                 , new_array_Type               , new_array_C                     ,    0 , true , false, false);

   gen(env, _new_array_nozero_Java          , new_array_Type               , new_array_nozero_C              ,    0 , true , false, false);

   gen(env, _multianewarray2_Java           , multianewarray2_Type         , multianewarray2_C               ,    0 , true , false, false);

   gen(env, _multianewarray3_Java           , multianewarray3_Type         , multianewarray3_C               ,    0 , true , false, false);

   gen(env, _multianewarray4_Java           , multianewarray4_Type         , multianewarray4_C               ,    0 , true , false, false);

   gen(env, _multianewarray5_Java           , multianewarray5_Type         , multianewarray5_C               ,    0 , true , false, false);

   gen(env, _multianewarrayN_Java           , multianewarrayN_Type         , multianewarrayN_C               ,    0 , true , false, false);

   gen(env, _g1_wb_pre_Java                 , g1_wb_pre_Type               , SharedRuntime::g1_wb_pre        ,    0 , false, false, false);

   gen(env, _g1_wb_post_Java                , g1_wb_post_Type              , SharedRuntime::g1_wb_post       ,    0 , false, false, false);

   gen(env, _complete_monitor_locking_Java  , complete_monitor_enter_Type  , SharedRuntime::complete_monitor_locking_C, 0, false, false, false);

   gen(env, _rethrow_Java                   , rethrow_Type                 , rethrow_C                       ,    2 , true , false, true );

   gen(env, _slow_arraycopy_Java            , slow_arraycopy_Type          , SharedRuntime::slow_arraycopy_C ,    0 , false, false, false);

   gen(env, _register_finalizer_Java        , register_finalizer_Type      , register_finalizer              ,    0 , false, false, false);

 # ifdef ENABLE_ZAP_DEAD_LOCALS

   gen(env, _zap_dead_Java_locals_Java      , zap_dead_locals_Type         , zap_dead_Java_locals_C          ,    0 , false, true , false );

   gen(env, _zap_dead_native_locals_Java    , zap_dead_locals_Type         , zap_dead_native_locals_C        ,    0 , false, true , false );

 # endif

   return true;

 }

 #undef gen

 // Helper method to do generation of RunTimeStub's

 address OptoRuntime::generate_stub( ciEnv* env,

                                     TypeFunc_generator gen, address C_function,

                                     const char *name, int is_fancy_jump,

                                     bool pass_tls,

                                     bool save_argument_registers,

                                     bool return_pc ) {

   ResourceMark rm;

   Compile C( env, gen, C_function, name, is_fancy_jump, pass_tls, save_argument_registers, return_pc );

   return  C.stub_entry_point();

 }

 const char* OptoRuntime::stub_name(address entry) {

 #ifndef PRODUCT

   CodeBlob* cb = CodeCache::find_blob(entry);

   RuntimeStub* rs =(RuntimeStub *)cb;

   assert(rs != NULL && rs->is_runtime_stub(), "not a runtime stub");

   return rs->name();

 #else

   // Fast implementation for product mode (maybe it should be inlined too)

   return "runtime stub";

 #endif

 }

 //=============================================================================

 // Opto compiler runtime routines

 //=============================================================================

 //=============================allocation======================================

 // We failed the fast-path allocation.  Now we need to do a scavenge or GC

 // and try allocation again.

 void OptoRuntime::new_store_pre_barrier(JavaThread* thread) {

   // After any safepoint, just before going back to compiled code,

   // we inform the GC that we will be doing initializing writes to

   // this object in the future without emitting card-marks, so

   // GC may take any compensating steps.

   // NOTE: Keep this code consistent with GraphKit::store_barrier.

   oop new_obj = thread->vm_result();

   if (new_obj == NULL)  return;

   assert(Universe::heap()->can_elide_tlab_store_barriers(),

          "compiler must check this first");

   // GC may decide to give back a safer copy of new_obj.

   new_obj = Universe::heap()->new_store_pre_barrier(thread, new_obj);

   thread->set_vm_result(new_obj);

 }

 // object allocation

 JRT_BLOCK_ENTRY(void, OptoRuntime::new_instance_C(Klass* klass, JavaThread* thread))

   JRT_BLOCK;

 #ifndef PRODUCT

   SharedRuntime::_new_instance_ctr++;         // new instance requires GC

 #endif

   assert(check_compiled_frame(thread), "incorrect caller");

   // These checks are cheap to make and support reflective allocation.

   int lh = klass->layout_helper();

   if (Klass::layout_helper_needs_slow_path(lh)

       || !InstanceKlass::cast(klass)->is_initialized()) {

     KlassHandle kh(THREAD, klass);

     kh->check_valid_for_instantiation(false, THREAD);

     if (!HAS_PENDING_EXCEPTION) {

       InstanceKlass::cast(kh())->initialize(THREAD);

     }

     if (!HAS_PENDING_EXCEPTION) {

       klass = kh();

     } else {

       klass = NULL;

     }

   }

   if (klass != NULL) {

     // Scavenge and allocate an instance.

     oop result = InstanceKlass::cast(klass)->allocate_instance(THREAD);

     thread->set_vm_result(result);

     // Pass oops back through thread local storage.  Our apparent type to Java

     // is that we return an oop, but we can block on exit from this routine and

     // a GC can trash the oop in C's return register.  The generated stub will

     // fetch the oop from TLS after any possible GC.

   }

   deoptimize_caller_frame(thread, HAS_PENDING_EXCEPTION);

   JRT_BLOCK_END;

   if (GraphKit::use_ReduceInitialCardMarks()) {

     // inform GC that we won't do card marks for initializing writes.

     new_store_pre_barrier(thread);

   }

 JRT_END

 // array allocation

 JRT_BLOCK_ENTRY(void, OptoRuntime::new_array_C(Klass* array_type, int len, JavaThread *thread))

   JRT_BLOCK;

 #ifndef PRODUCT

   SharedRuntime::_new_array_ctr++;            // new array requires GC

 #endif

   assert(check_compiled_frame(thread), "incorrect caller");

   // Scavenge and allocate an instance.

   oop result;

   if (array_type->oop_is_typeArray()) {

     // The oopFactory likes to work with the element type.

     // (We could bypass the oopFactory, since it doesn't add much value.)

     BasicType elem_type = TypeArrayKlass::cast(array_type)->element_type();

     result = oopFactory::new_typeArray(elem_type, len, THREAD);

   } else {

     // Although the oopFactory likes to work with the elem_type,

     // the compiler prefers the array_type, since it must already have

     // that latter value in hand for the fast path.

     Klass* elem_type = ObjArrayKlass::cast(array_type)->element_klass();

     result = oopFactory::new_objArray(elem_type, len, THREAD);

   }

   // Pass oops back through thread local storage.  Our apparent type to Java

   // is that we return an oop, but we can block on exit from this routine and

   // a GC can trash the oop in C's return register.  The generated stub will

   // fetch the oop from TLS after any possible GC.

   deoptimize_caller_frame(thread, HAS_PENDING_EXCEPTION);

   thread->set_vm_result(result);

   JRT_BLOCK_END;

   if (GraphKit::use_ReduceInitialCardMarks()) {

     // inform GC that we won't do card marks for initializing writes.

     new_store_pre_barrier(thread);

   }

 JRT_END

 // array allocation without zeroing

 JRT_BLOCK_ENTRY(void, OptoRuntime::new_array_nozero_C(Klass* array_type, int len, JavaThread *thread))

   JRT_BLOCK;

 #ifndef PRODUCT

   SharedRuntime::_new_array_ctr++;            // new array requires GC

 #endif

   assert(check_compiled_frame(thread), "incorrect caller");

   // Scavenge and allocate an instance.

   oop result;

   assert(array_type->oop_is_typeArray(), "should be called only for type array");

   // The oopFactory likes to work with the element type.

   BasicType elem_type = TypeArrayKlass::cast(array_type)->element_type();

   result = oopFactory::new_typeArray_nozero(elem_type, len, THREAD);

   // Pass oops back through thread local storage.  Our apparent type to Java

   // is that we return an oop, but we can block on exit from this routine and

   // a GC can trash the oop in C's return register.  The generated stub will

   // fetch the oop from TLS after any possible GC.

   deoptimize_caller_frame(thread, HAS_PENDING_EXCEPTION);

   thread->set_vm_result(result);

   JRT_BLOCK_END;

   if (GraphKit::use_ReduceInitialCardMarks()) {

     // inform GC that we won't do card marks for initializing writes.

     new_store_pre_barrier(thread);

   }

   oop result = thread->vm_result();

   if ((len > 0) && (result != NULL) &&

       is_deoptimized_caller_frame(thread)) {

     // Zero array here if the caller is deoptimized.

     int size = ((typeArrayOop)result)->object_size();

     BasicType elem_type = TypeArrayKlass::cast(array_type)->element_type();

     const size_t hs = arrayOopDesc::header_size(elem_type);

     // Align to next 8 bytes to avoid trashing arrays's length.

     const size_t aligned_hs = align_object_offset(hs);

     HeapWord* obj = (HeapWord*)result;

     if (aligned_hs > hs) {

       Copy::zero_to_words(obj+hs, aligned_hs-hs);

     }

     // Optimized zeroing.

     Copy::fill_to_aligned_words(obj+aligned_hs, size-aligned_hs);

   }

 JRT_END

 // Note: multianewarray for one dimension is handled inline by GraphKit::new_array.

 // multianewarray for 2 dimensions

 JRT_ENTRY(void, OptoRuntime::multianewarray2_C(Klass* elem_type, int len1, int len2, JavaThread *thread))

 #ifndef PRODUCT

   SharedRuntime::_multi2_ctr++;                // multianewarray for 1 dimension

 #endif

   assert(check_compiled_frame(thread), "incorrect caller");

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

   jint dims[2];

   dims[0] = len1;

   dims[1] = len2;

   oop obj = ArrayKlass::cast(elem_type)->multi_allocate(2, dims, THREAD);

   deoptimize_caller_frame(thread, HAS_PENDING_EXCEPTION);

   thread->set_vm_result(obj);

 JRT_END

 // multianewarray for 3 dimensions

 JRT_ENTRY(void, OptoRuntime::multianewarray3_C(Klass* elem_type, int len1, int len2, int len3, JavaThread *thread))

 #ifndef PRODUCT

   SharedRuntime::_multi3_ctr++;                // multianewarray for 1 dimension

 #endif

   assert(check_compiled_frame(thread), "incorrect caller");

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

   jint dims[3];

   dims[0] = len1;

   dims[1] = len2;

   dims[2] = len3;

   oop obj = ArrayKlass::cast(elem_type)->multi_allocate(3, dims, THREAD);

   deoptimize_caller_frame(thread, HAS_PENDING_EXCEPTION);

   thread->set_vm_result(obj);

 JRT_END

 // multianewarray for 4 dimensions

 JRT_ENTRY(void, OptoRuntime::multianewarray4_C(Klass* elem_type, int len1, int len2, int len3, int len4, JavaThread *thread))

 #ifndef PRODUCT

   SharedRuntime::_multi4_ctr++;                // multianewarray for 1 dimension

 #endif

   assert(check_compiled_frame(thread), "incorrect caller");

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

   jint dims[4];

   dims[0] = len1;

   dims[1] = len2;

   dims[2] = len3;

   dims[3] = len4;

   oop obj = ArrayKlass::cast(elem_type)->multi_allocate(4, dims, THREAD);

   deoptimize_caller_frame(thread, HAS_PENDING_EXCEPTION);

   thread->set_vm_result(obj);

 JRT_END

 // multianewarray for 5 dimensions

 JRT_ENTRY(void, OptoRuntime::multianewarray5_C(Klass* elem_type, int len1, int len2, int len3, int len4, int len5, JavaThread *thread))

 #ifndef PRODUCT

   SharedRuntime::_multi5_ctr++;                // multianewarray for 1 dimension

 #endif

   assert(check_compiled_frame(thread), "incorrect caller");

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

   jint dims[5];

   dims[0] = len1;

   dims[1] = len2;

   dims[2] = len3;

   dims[3] = len4;

   dims[4] = len5;

   oop obj = ArrayKlass::cast(elem_type)->multi_allocate(5, dims, THREAD);

   deoptimize_caller_frame(thread, HAS_PENDING_EXCEPTION);

   thread->set_vm_result(obj);

 JRT_END

 JRT_ENTRY(void, OptoRuntime::multianewarrayN_C(Klass* elem_type, arrayOopDesc* dims, JavaThread *thread))

   assert(check_compiled_frame(thread), "incorrect caller");

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

   assert(oop(dims)->is_typeArray(), "not an array");

   ResourceMark rm;

   jint len = dims->length();

   assert(len > 0, "Dimensions array should contain data");

   jint *j_dims = typeArrayOop(dims)->int_at_addr(0);

   jint *c_dims = NEW_RESOURCE_ARRAY(jint, len);

   Copy::conjoint_jints_atomic(j_dims, c_dims, len);

   oop obj = ArrayKlass::cast(elem_type)->multi_allocate(len, c_dims, THREAD);

   deoptimize_caller_frame(thread, HAS_PENDING_EXCEPTION);

   thread->set_vm_result(obj);

 JRT_END

 const TypeFunc *OptoRuntime::new_instance_Type() {

   // create input type (domain)

   const Type **fields = TypeTuple::fields(1);

   fields[TypeFunc::Parms+0] = TypeInstPtr::NOTNULL; // Klass to be allocated

   const TypeTuple *domain = TypeTuple::make(TypeFunc::Parms+1, fields);

   // create result type (range)

   fields = TypeTuple::fields(1);

   fields[TypeFunc::Parms+0] = TypeRawPtr::NOTNULL; // Returned oop

   const TypeTuple *range = TypeTuple::make(TypeFunc::Parms+1, fields);

   return TypeFunc::make(domain, range);

 }

 const TypeFunc *OptoRuntime::athrow_Type() {

   // create input type (domain)

   const Type **fields = TypeTuple::fields(1);

   fields[TypeFunc::Parms+0] = TypeInstPtr::NOTNULL; // Klass to be allocated

   const TypeTuple *domain = TypeTuple::make(TypeFunc::Parms+1, fields);

   // create result type (range)

   fields = TypeTuple::fields(0);

   const TypeTuple *range = TypeTuple::make(TypeFunc::Parms+0, fields);

   return TypeFunc::make(domain, range);

 }

 const TypeFunc *OptoRuntime::new_array_Type() {

   // create input type (domain)

   const Type **fields = TypeTuple::fields(2);

   fields[TypeFunc::Parms+0] = TypeInstPtr::NOTNULL;   // element klass

   fields[TypeFunc::Parms+1] = TypeInt::INT;       // array size

   const TypeTuple *domain = TypeTuple::make(TypeFunc::Parms+2, fields);

   // create result type (range)

   fields = TypeTuple::fields(1);

   fields[TypeFunc::Parms+0] = TypeRawPtr::NOTNULL; // Returned oop

   const TypeTuple *range = TypeTuple::make(TypeFunc::Parms+1, fields);

   return TypeFunc::make(domain, range);

 }

 const TypeFunc *OptoRuntime::multianewarray_Type(int ndim) {

   // create input type (domain)

   const int nargs = ndim + 1;

   const Type **fields = TypeTuple::fields(nargs);

   fields[TypeFunc::Parms+0] = TypeInstPtr::NOTNULL;   // element klass

   for( int i = 1; i < nargs; i++ )

     fields[TypeFunc::Parms + i] = TypeInt::INT;       // array size

   const TypeTuple *domain = TypeTuple::make(TypeFunc::Parms+nargs, fields);

   // create result type (range)

   fields = TypeTuple::fields(1);

   fields[TypeFunc::Parms+0] = TypeRawPtr::NOTNULL; // Returned oop

   const TypeTuple *range = TypeTuple::make(TypeFunc::Parms+1, fields);

   return TypeFunc::make(domain, range);

 }

 const TypeFunc *OptoRuntime::multianewarray2_Type() {

   return multianewarray_Type(2);

 }

 const TypeFunc *OptoRuntime::multianewarray3_Type() {

   return multianewarray_Type(3);

 }

 const TypeFunc *OptoRuntime::multianewarray4_Type() {

   return multianewarray_Type(4);

 }

 const TypeFunc *OptoRuntime::multianewarray5_Type() {

   return multianewarray_Type(5);

 }

 const TypeFunc *OptoRuntime::multianewarrayN_Type() {

   // create input type (domain)

   const Type **fields = TypeTuple::fields(2);

   fields[TypeFunc::Parms+0] = TypeInstPtr::NOTNULL;   // element klass

   fields[TypeFunc::Parms+1] = TypeInstPtr::NOTNULL;   // array of dim sizes

   const TypeTuple *domain = TypeTuple::make(TypeFunc::Parms+2, fields);

   // create result type (range)

   fields = TypeTuple::fields(1);

   fields[TypeFunc::Parms+0] = TypeRawPtr::NOTNULL; // Returned oop

   const TypeTuple *range = TypeTuple::make(TypeFunc::Parms+1, fields);

   return TypeFunc::make(domain, range);

 }

 const TypeFunc *OptoRuntime::g1_wb_pre_Type() {

   const Type **fields = TypeTuple::fields(2);

   fields[TypeFunc::Parms+0] = TypeInstPtr::NOTNULL; // original field value

   fields[TypeFunc::Parms+1] = TypeRawPtr::NOTNULL; // thread

   const TypeTuple *domain = TypeTuple::make(TypeFunc::Parms+2, fields);

   // create result type (range)

   fields = TypeTuple::fields(0);

   const TypeTuple *range = TypeTuple::make(TypeFunc::Parms+0, fields);

   return TypeFunc::make(domain, range);

 }

 const TypeFunc *OptoRuntime::g1_wb_post_Type() {

   const Type **fields = TypeTuple::fields(2);

   fields[TypeFunc::Parms+0] = TypeRawPtr::NOTNULL;  // Card addr

   fields[TypeFunc::Parms+1] = TypeRawPtr::NOTNULL;  // thread

   const TypeTuple *domain = TypeTuple::make(TypeFunc::Parms+2, fields);

   // create result type (range)

   fields = TypeTuple::fields(0);

   const TypeTuple *range = TypeTuple::make(TypeFunc::Parms, fields);

   return TypeFunc::make(domain, range);

 }

 const TypeFunc *OptoRuntime::uncommon_trap_Type() {

   // create input type (domain)

   const Type **fields = TypeTuple::fields(1);

   // Symbol* name of class to be loaded

   fields[TypeFunc::Parms+0] = TypeInt::INT;

   const TypeTuple *domain = TypeTuple::make(TypeFunc::Parms+1, fields);

   // create result type (range)

   fields = TypeTuple::fields(0);

   const TypeTuple *range = TypeTuple::make(TypeFunc::Parms+0, fields);

   return TypeFunc::make(domain, range);

 }

 # ifdef ENABLE_ZAP_DEAD_LOCALS

 // Type used for stub generation for zap_dead_locals.

 // No inputs or outputs

 const TypeFunc *OptoRuntime::zap_dead_locals_Type() {

   // create input type (domain)

   const Type **fields = TypeTuple::fields(0);

   const TypeTuple *domain = TypeTuple::make(TypeFunc::Parms,fields);

   // create result type (range)

   fields = TypeTuple::fields(0);

   const TypeTuple *range = TypeTuple::make(TypeFunc::Parms,fields);

   return TypeFunc::make(domain,range);

 }

 # endif

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

 // Monitor Handling

 const TypeFunc *OptoRuntime::complete_monitor_enter_Type() {

   // create input type (domain)

   const Type **fields = TypeTuple::fields(2);

   fields[TypeFunc::Parms+0] = TypeInstPtr::NOTNULL;  // Object to be Locked

   fields[TypeFunc::Parms+1] = TypeRawPtr::BOTTOM;   // Address of stack location for lock

   const TypeTuple *domain = TypeTuple::make(TypeFunc::Parms+2,fields);

   // create result type (range)

   fields = TypeTuple::fields(0);

   const TypeTuple *range = TypeTuple::make(TypeFunc::Parms+0,fields);

   return TypeFunc::make(domain,range);

 }

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

 const TypeFunc *OptoRuntime::complete_monitor_exit_Type() {

   // create input type (domain)

   const Type **fields = TypeTuple::fields(2);

   fields[TypeFunc::Parms+0] = TypeInstPtr::NOTNULL;  // Object to be Locked

   fields[TypeFunc::Parms+1] = TypeRawPtr::BOTTOM;   // Address of stack location for lock

   const TypeTuple *domain = TypeTuple::make(TypeFunc::Parms+2,fields);

   // create result type (range)

   fields = TypeTuple::fields(0);

   const TypeTuple *range = TypeTuple::make(TypeFunc::Parms+0,fields);

   return TypeFunc::make(domain,range);

 }

 const TypeFunc* OptoRuntime::flush_windows_Type() {

   // create input type (domain)

   const Type** fields = TypeTuple::fields(1);

   fields[TypeFunc::Parms+0] = NULL; // void

   const TypeTuple *domain = TypeTuple::make(TypeFunc::Parms, fields);

   // create result type

   fields = TypeTuple::fields(1);

   fields[TypeFunc::Parms+0] = NULL; // void

   const TypeTuple *range = TypeTuple::make(TypeFunc::Parms, fields);

   return TypeFunc::make(domain, range);

 }

 const TypeFunc* OptoRuntime::l2f_Type() {

   // create input type (domain)

   const Type **fields = TypeTuple::fields(2);

   fields[TypeFunc::Parms+0] = TypeLong::LONG;

   fields[TypeFunc::Parms+1] = Type::HALF;

   const TypeTuple *domain = TypeTuple::make(TypeFunc::Parms+2, fields);

   // create result type (range)

   fields = TypeTuple::fields(1);

   fields[TypeFunc::Parms+0] = Type::FLOAT;

   const TypeTuple *range = TypeTuple::make(TypeFunc::Parms+1, fields);

   return TypeFunc::make(domain, range);

 }

 const TypeFunc* OptoRuntime::modf_Type() {

   const Type **fields = TypeTuple::fields(2);

   fields[TypeFunc::Parms+0] = Type::FLOAT;

   fields[TypeFunc::Parms+1] = Type::FLOAT;

   const TypeTuple *domain = TypeTuple::make(TypeFunc::Parms+2, fields);

   // create result type (range)

   fields = TypeTuple::fields(1);

   fields[TypeFunc::Parms+0] = Type::FLOAT;

   const TypeTuple *range = TypeTuple::make(TypeFunc::Parms+1, fields);

   return TypeFunc::make(domain, range);

 }

 const TypeFunc *OptoRuntime::Math_D_D_Type() {

   // create input type (domain)

   const Type **fields = TypeTuple::fields(2);

   // Symbol* name of class to be loaded

   fields[TypeFunc::Parms+0] = Type::DOUBLE;

   fields[TypeFunc::Parms+1] = Type::HALF;

   const TypeTuple *domain = TypeTuple::make(TypeFunc::Parms+2, fields);

   // create result type (range)

   fields = TypeTuple::fields(2);

   fields[TypeFunc::Parms+0] = Type::DOUBLE;

   fields[TypeFunc::Parms+1] = Type::HALF;

   const TypeTuple *range = TypeTuple::make(TypeFunc::Parms+2, fields);

   return TypeFunc::make(domain, range);

 }

 const TypeFunc* OptoRuntime::Math_DD_D_Type() {

   const Type **fields = TypeTuple::fields(4);

   fields[TypeFunc::Parms+0] = Type::DOUBLE;

   fields[TypeFunc::Parms+1] = Type::HALF;

   fields[TypeFunc::Parms+2] = Type::DOUBLE;

   fields[TypeFunc::Parms+3] = Type::HALF;

   const TypeTuple *domain = TypeTuple::make(TypeFunc::Parms+4, fields);

   // create result type (range)

   fields = TypeTuple::fields(2);

   fields[TypeFunc::Parms+0] = Type::DOUBLE;

   fields[TypeFunc::Parms+1] = Type::HALF;

   const TypeTuple *range = TypeTuple::make(TypeFunc::Parms+2, fields);

   return TypeFunc::make(domain, range);

 }

 //-------------- currentTimeMillis, currentTimeNanos, etc

 const TypeFunc* OptoRuntime::void_long_Type() {

   // create input type (domain)

   const Type **fields = TypeTuple::fields(0);

   const TypeTuple *domain = TypeTuple::make(TypeFunc::Parms+0, fields);

   // create result type (range)

   fields = TypeTuple::fields(2);

   fields[TypeFunc::Parms+0] = TypeLong::LONG;

   fields[TypeFunc::Parms+1] = Type::HALF;

   const TypeTuple *range = TypeTuple::make(TypeFunc::Parms+2, fields);

   return TypeFunc::make(domain, range);

 }

 // arraycopy stub variations:

 enum ArrayCopyType {

   ac_fast,                      // void(ptr, ptr, size_t)

   ac_checkcast,                 //  int(ptr, ptr, size_t, size_t, ptr)

   ac_slow,                      // void(ptr, int, ptr, int, int)

   ac_generic                    //  int(ptr, int, ptr, int, int)

 };

 static const TypeFunc* make_arraycopy_Type(ArrayCopyType act) {

   // create input type (domain)

   int num_args      = (act == ac_fast ? 3 : 5);

   int num_size_args = (act == ac_fast ? 1 : act == ac_checkcast ? 2 : 0);

   int argcnt = num_args;

   LP64_ONLY(argcnt += num_size_args); // halfwords for lengths

   const Type** fields = TypeTuple::fields(argcnt);

   int argp = TypeFunc::Parms;

   fields[argp++] = TypePtr::NOTNULL;    // src

   if (num_size_args == 0) {

     fields[argp++] = TypeInt::INT;      // src_pos

   }

   fields[argp++] = TypePtr::NOTNULL;    // dest

   if (num_size_args == 0) {

     fields[argp++] = TypeInt::INT;      // dest_pos

     fields[argp++] = TypeInt::INT;      // length

   }

   while (num_size_args-- > 0) {

     fields[argp++] = TypeX_X;               // size in whatevers (size_t)

     LP64_ONLY(fields[argp++] = Type::HALF); // other half of long length

   }

   if (act == ac_checkcast) {

     fields[argp++] = TypePtr::NOTNULL;  // super_klass

   }

   assert(argp == TypeFunc::Parms+argcnt, "correct decoding of act");

   const TypeTuple* domain = TypeTuple::make(TypeFunc::Parms+argcnt, fields);

   // create result type if needed

   int retcnt = (act == ac_checkcast || act == ac_generic ? 1 : 0);

   fields = TypeTuple::fields(1);

   if (retcnt == 0)

     fields[TypeFunc::Parms+0] = NULL; // void

   else

     fields[TypeFunc::Parms+0] = TypeInt::INT; // status result, if needed

   const TypeTuple* range = TypeTuple::make(TypeFunc::Parms+retcnt, fields);

   return TypeFunc::make(domain, range);

 }

 const TypeFunc* OptoRuntime::fast_arraycopy_Type() {

   // This signature is simple:  Two base pointers and a size_t.

   return make_arraycopy_Type(ac_fast);

 }

 const TypeFunc* OptoRuntime::checkcast_arraycopy_Type() {

   // An extension of fast_arraycopy_Type which adds type checking.

   return make_arraycopy_Type(ac_checkcast);

 }

 const TypeFunc* OptoRuntime::slow_arraycopy_Type() {

   // This signature is exactly the same as System.arraycopy.

   // There are no intptr_t (int/long) arguments.

   return make_arraycopy_Type(ac_slow);

 }

 const TypeFunc* OptoRuntime::generic_arraycopy_Type() {

   // This signature is like System.arraycopy, except that it returns status.

   return make_arraycopy_Type(ac_generic);

 }

 const TypeFunc* OptoRuntime::array_fill_Type() {

   const Type** fields;

   int argp = TypeFunc::Parms;

   if (CCallingConventionRequiresIntsAsLongs) {

   // create input type (domain): pointer, int, size_t

     fields = TypeTuple::fields(3 LP64_ONLY( + 2));

     fields[argp++] = TypePtr::NOTNULL;

     fields[argp++] = TypeLong::LONG;

     fields[argp++] = Type::HALF;

   } else {

     // create input type (domain): pointer, int, size_t

     fields = TypeTuple::fields(3 LP64_ONLY( + 1));

     fields[argp++] = TypePtr::NOTNULL;

     fields[argp++] = TypeInt::INT;

   }

   fields[argp++] = TypeX_X;               // size in whatevers (size_t)

   LP64_ONLY(fields[argp++] = Type::HALF); // other half of long length

   const TypeTuple *domain = TypeTuple::make(argp, fields);

   // create result type

   fields = TypeTuple::fields(1);

   fields[TypeFunc::Parms+0] = NULL; // void

   const TypeTuple *range = TypeTuple::make(TypeFunc::Parms, fields);

   return TypeFunc::make(domain, range);

 }

 // for aescrypt encrypt/decrypt operations, just three pointers returning void (length is constant)

 const TypeFunc* OptoRuntime::aescrypt_block_Type() {

   // create input type (domain)

   int num_args      = 3;

   if (Matcher::pass_original_key_for_aes()) {

     num_args = 4;

   }

   int argcnt = num_args;

   const Type** fields = TypeTuple::fields(argcnt);

   int argp = TypeFunc::Parms;

   fields[argp++] = TypePtr::NOTNULL;    // src

   fields[argp++] = TypePtr::NOTNULL;    // dest

   fields[argp++] = TypePtr::NOTNULL;    // k array

   if (Matcher::pass_original_key_for_aes()) {

     fields[argp++] = TypePtr::NOTNULL;    // original k array

   }

   assert(argp == TypeFunc::Parms+argcnt, "correct decoding");

   const TypeTuple* domain = TypeTuple::make(TypeFunc::Parms+argcnt, fields);

   // no result type needed

   fields = TypeTuple::fields(1);

   fields[TypeFunc::Parms+0] = NULL; // void

   const TypeTuple* range = TypeTuple::make(TypeFunc::Parms, fields);

   return TypeFunc::make(domain, range);

 }

 /**

  * int updateBytesCRC32(int crc, byte* b, int len)

  */

 const TypeFunc* OptoRuntime::updateBytesCRC32_Type() {

   // create input type (domain)

   int num_args      = 3;

   int argcnt = num_args;

   const Type** fields = TypeTuple::fields(argcnt);

   int argp = TypeFunc::Parms;

   fields[argp++] = TypeInt::INT;        // crc

   fields[argp++] = TypePtr::NOTNULL;    // src

   fields[argp++] = TypeInt::INT;        // len

   assert(argp == TypeFunc::Parms+argcnt, "correct decoding");

   const TypeTuple* domain = TypeTuple::make(TypeFunc::Parms+argcnt, fields);

   // result type needed

   fields = TypeTuple::fields(1);

   fields[TypeFunc::Parms+0] = TypeInt::INT; // crc result

   const TypeTuple* range = TypeTuple::make(TypeFunc::Parms+1, fields);

   return TypeFunc::make(domain, range);

 }

 // for cipherBlockChaining calls of aescrypt encrypt/decrypt, four pointers and a length, returning int

 const TypeFunc* OptoRuntime::cipherBlockChaining_aescrypt_Type() {

   // create input type (domain)

   int num_args      = 5;

   if (Matcher::pass_original_key_for_aes()) {

     num_args = 6;

   }

   int argcnt = num_args;

   const Type** fields = TypeTuple::fields(argcnt);

   int argp = TypeFunc::Parms;

   fields[argp++] = TypePtr::NOTNULL;    // src

   fields[argp++] = TypePtr::NOTNULL;    // dest

   fields[argp++] = TypePtr::NOTNULL;    // k array

   fields[argp++] = TypePtr::NOTNULL;    // r array

   fields[argp++] = TypeInt::INT;        // src len

   if (Matcher::pass_original_key_for_aes()) {

     fields[argp++] = TypePtr::NOTNULL;    // original k array

   }

   assert(argp == TypeFunc::Parms+argcnt, "correct decoding");

   const TypeTuple* domain = TypeTuple::make(TypeFunc::Parms+argcnt, fields);

   // returning cipher len (int)

   fields = TypeTuple::fields(1);

   fields[TypeFunc::Parms+0] = TypeInt::INT;

   const TypeTuple* range = TypeTuple::make(TypeFunc::Parms+1, fields);

   return TypeFunc::make(domain, range);

 }

 /*

  * void implCompress(byte[] buf, int ofs)

  */

 const TypeFunc* OptoRuntime::sha_implCompress_Type() {

   // create input type (domain)

   int num_args = 2;

   int argcnt = num_args;

   const Type** fields = TypeTuple::fields(argcnt);

   int argp = TypeFunc::Parms;

   fields[argp++] = TypePtr::NOTNULL; // buf

   fields[argp++] = TypePtr::NOTNULL; // state

   assert(argp == TypeFunc::Parms+argcnt, "correct decoding");

   const TypeTuple* domain = TypeTuple::make(TypeFunc::Parms+argcnt, fields);

   // no result type needed

   fields = TypeTuple::fields(1);

   fields[TypeFunc::Parms+0] = NULL; // void

   const TypeTuple* range = TypeTuple::make(TypeFunc::Parms, fields);

   return TypeFunc::make(domain, range);

 }

 /*

  * int implCompressMultiBlock(byte[] b, int ofs, int limit)

  */

 const TypeFunc* OptoRuntime::digestBase_implCompressMB_Type() {

   // create input type (domain)

   int num_args = 4;

   int argcnt = num_args;

   const Type** fields = TypeTuple::fields(argcnt);

   int argp = TypeFunc::Parms;

   fields[argp++] = TypePtr::NOTNULL; // buf

   fields[argp++] = TypePtr::NOTNULL; // state

   fields[argp++] = TypeInt::INT;     // ofs

   fields[argp++] = TypeInt::INT;     // limit

   assert(argp == TypeFunc::Parms+argcnt, "correct decoding");

   const TypeTuple* domain = TypeTuple::make(TypeFunc::Parms+argcnt, fields);

   // returning ofs (int)

   fields = TypeTuple::fields(1);

   fields[TypeFunc::Parms+0] = TypeInt::INT; // ofs

   const TypeTuple* range = TypeTuple::make(TypeFunc::Parms+1, fields);

   return TypeFunc::make(domain, range);

 }

 //------------- Interpreter state access for on stack replacement

 const TypeFunc* OptoRuntime::osr_end_Type() {

   // create input type (domain)

   const Type **fields = TypeTuple::fields(1);

   fields[TypeFunc::Parms+0] = TypeRawPtr::BOTTOM; // OSR temp buf

   const TypeTuple *domain = TypeTuple::make(TypeFunc::Parms+1, fields);

   // create result type

   fields = TypeTuple::fields(1);

   // fields[TypeFunc::Parms+0] = TypeInstPtr::NOTNULL; // locked oop

   fields[TypeFunc::Parms+0] = NULL; // void

   const TypeTuple *range = TypeTuple::make(TypeFunc::Parms, fields);

   return TypeFunc::make(domain, range);

 }

 //-------------- methodData update helpers

 const TypeFunc* OptoRuntime::profile_receiver_type_Type() {

   // create input type (domain)

   const Type **fields = TypeTuple::fields(2);

   fields[TypeFunc::Parms+0] = TypeAryPtr::NOTNULL;    // methodData pointer

   fields[TypeFunc::Parms+1] = TypeInstPtr::BOTTOM;    // receiver oop

   const TypeTuple *domain = TypeTuple::make(TypeFunc::Parms+2, fields);

   // create result type

   fields = TypeTuple::fields(1);

   fields[TypeFunc::Parms+0] = NULL; // void

   const TypeTuple *range = TypeTuple::make(TypeFunc::Parms, fields);

   return TypeFunc::make(domain,range);

 }

 JRT_LEAF(void, OptoRuntime::profile_receiver_type_C(DataLayout* data, oopDesc* receiver))

   if (receiver == NULL) return;

   Klass* receiver_klass = receiver->klass();

   intptr_t* mdp = ((intptr_t*)(data)) + DataLayout::header_size_in_cells();

   int empty_row = -1;           // free row, if any is encountered

   // ReceiverTypeData* vc = new ReceiverTypeData(mdp);

   for (uint row = 0; row < ReceiverTypeData::row_limit(); row++) {

     // if (vc->receiver(row) == receiver_klass)

     int receiver_off = ReceiverTypeData::receiver_cell_index(row);

     intptr_t row_recv = *(mdp + receiver_off);

     if (row_recv == (intptr_t) receiver_klass) {

       // vc->set_receiver_count(row, vc->receiver_count(row) + DataLayout::counter_increment);

       int count_off = ReceiverTypeData::receiver_count_cell_index(row);

       *(mdp + count_off) += DataLayout::counter_increment;

       return;

     } else if (row_recv == 0) {

       // else if (vc->receiver(row) == NULL)

       empty_row = (int) row;

     }

   }

   if (empty_row != -1) {

     int receiver_off = ReceiverTypeData::receiver_cell_index(empty_row);

     // vc->set_receiver(empty_row, receiver_klass);

     *(mdp + receiver_off) = (intptr_t) receiver_klass;

     // vc->set_receiver_count(empty_row, DataLayout::counter_increment);

     int count_off = ReceiverTypeData::receiver_count_cell_index(empty_row);

     *(mdp + count_off) = DataLayout::counter_increment;

   } else {

     // Receiver did not match any saved receiver and there is no empty row for it.

     // Increment total counter to indicate polymorphic case.

     intptr_t* count_p = (intptr_t*)(((byte*)(data)) + in_bytes(CounterData::count_offset()));

     *count_p += DataLayout::counter_increment;

   }

 JRT_END

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

 // register policy

 bool OptoRuntime::is_callee_saved_register(MachRegisterNumbers reg) {

   assert(reg >= 0 && reg < _last_Mach_Reg, "must be a machine register");

   switch (register_save_policy[reg]) {

     case 'C': return false; //SOC

     case 'E': return true ; //SOE

     case 'N': return false; //NS

     case 'A': return false; //AS

   }

   ShouldNotReachHere();

   return false;

 }

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

 // Exceptions

 //

 static void trace_exception(oop exception_oop, address exception_pc, const char* msg) PRODUCT_RETURN;

 // The method is an entry that is always called by a C++ method not

 // directly from compiled code. Compiled code will call the C++ method following.

 // We can't allow async exception to be installed during  exception processing.

 JRT_ENTRY_NO_ASYNC(address, OptoRuntime::handle_exception_C_helper(JavaThread* thread, nmethod* &nm))

   // Do not confuse exception_oop with pending_exception. The exception_oop

   // is only used to pass arguments into the method. Not for general

   // exception handling.  DO NOT CHANGE IT to use pending_exception, since

   // the runtime stubs checks this on exit.

   assert(thread->exception_oop() != NULL, "exception oop is found");

   address handler_address = NULL;

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

   address pc = thread->exception_pc();

   // 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->clear_exception_oop_and_pc();

   if (TraceExceptions) {

     trace_exception(exception(), pc, "");

   }

   // for AbortVMOnException flag

   NOT_PRODUCT(Exceptions::debug_check_abort(exception));

 #ifdef ASSERT

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

     // should throw an exception here

     ShouldNotReachHere();

   }

 #endif

   // new exception handling: this method is entered only from adapters

   // exceptions from compiled java methods are handled in compiled code

   // using rethrow node

   nm = CodeCache::find_nmethod(pc);

   assert(nm != NULL, "No NMethod found");

   if (nm->is_native_method()) {

     fatal("Native method should not have path to exception handling");

   } else {

     // we are switching to old paradigm: search for exception handler in caller_frame

     // instead in exception handler of caller_frame.sender()

     if (JvmtiExport::can_post_on_exceptions()) {

       // "Full-speed catching" is not necessary here,

       // since we're notifying the VM on every catch.

       // Force deoptimization and the rest of the lookup

       // will be fine.

       deoptimize_caller_frame(thread);

     }

     // Check the stack guard pages.  If enabled, look for handler in this frame;

     // otherwise, forcibly unwind the frame.

     //

     // 4826555: use default current sp for reguard_stack instead of &nm: it's more accurate.

     bool force_unwind = !thread->reguard_stack();

     bool deopting = false;

     if (nm->is_deopt_pc(pc)) {

       deopting = true;

       RegisterMap map(thread, false);

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

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

       // Adjust the pc back to the original throwing pc

       pc = deoptee.pc();

     }

     // If we are forcing an unwind because of stack overflow then deopt is

     // irrelevant since we are throwing the frame away anyway.

     if (deopting && !force_unwind) {

       handler_address = SharedRuntime::deopt_blob()->unpack_with_exception();

     } else {

       handler_address =

         force_unwind ? NULL : nm->handler_for_exception_and_pc(exception, pc);

       if (handler_address == NULL) {

         Handle original_exception(thread, exception());

         handler_address = SharedRuntime::compute_compiled_exc_handler(nm, pc, exception, force_unwind, true);

         assert (handler_address != NULL, "must have compiled handler");

         // Update the exception cache only when the unwind was not forced

         // and there didn't happen another exception during the computation of the

         // compiled exception handler.

         if (!force_unwind && original_exception() == exception()) {

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

         }

       } else {

         assert(handler_address == SharedRuntime::compute_compiled_exc_handler(nm, pc, exception, force_unwind, true), "Must be the same");

       }

     }

     thread->set_exception_pc(pc);

     thread->set_exception_handler_pc(handler_address);

     // Check if the exception PC is a MethodHandle call site.

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

   }

   // Restore correct return pc.  Was saved above.

   thread->set_exception_oop(exception());

   return handler_address;

 JRT_END

 // We are entering here from exception_blob

 // 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 without the usual JRT wrapper. We will call a helper routine that

 // will do the normal VM entry. We do it this way so that we can see if the nmethod

 // we looked up the handler for has been deoptimized in the meantime. If it has been

 // we must not use the handler and instead return the deopt blob.

 address OptoRuntime::handle_exception_C(JavaThread* thread) {

 //

 // We are in Java not VM and in debug mode we have a NoHandleMark

 //

 #ifndef PRODUCT

   SharedRuntime::_find_handler_ctr++;          // find exception handler

 #endif

   debug_only(NoHandleMark __hm;)

   nmethod* nm = NULL;

   address handler_address = NULL;

   {

     // Enter the VM

     ResetNoHandleMark rnhm;

     handler_address = handle_exception_C_helper(thread, nm);

   }

   // Back in java: Use no oops, DON'T safepoint

   // Now check to see if the handler we are returning is in a now

   // deoptimized frame

   if (nm != NULL) {

     RegisterMap map(thread, false);

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

 #ifdef ASSERT

     assert(caller.is_compiled_frame(), "must be");

 #endif // ASSERT

     if (caller.is_deoptimized_frame()) {

       handler_address = SharedRuntime::deopt_blob()->unpack_with_exception();

     }

   }

   return handler_address;

 }

 //------------------------------rethrow----------------------------------------

 // We get here after compiled code has executed a 'RethrowNode'.  The callee

 // is either throwing or rethrowing an exception.  The callee-save registers

 // have been restored, synchronized objects have been unlocked and the callee

 // stack frame has been removed.  The return address was passed in.

 // Exception oop is passed as the 1st argument.  This routine is then called

 // from the stub.  On exit, we know where to jump in the caller's code.

 // After this C code exits, the stub will pop his frame and end in a jump

 // (instead of a return).  We enter the caller's default handler.

 //

 // This must be JRT_LEAF:

 //     - caller will not change its state as we cannot block on exit,

 //       therefore raw_exception_handler_for_return_address is all it takes

 //       to handle deoptimized blobs

 //

 // However, there needs to be a safepoint check in the middle!  So compiled

 // safepoints are completely watertight.

 //

 // Thus, it cannot be a leaf since it contains the No_GC_Verifier.

 //

 // *THIS IS NOT RECOMMENDED PROGRAMMING STYLE*

 //

 address OptoRuntime::rethrow_C(oopDesc* exception, JavaThread* thread, address ret_pc) {

 #ifndef PRODUCT

   SharedRuntime::_rethrow_ctr++;               // count rethrows

 #endif

   assert (exception != NULL, "should have thrown a NULLPointerException");

 #ifdef ASSERT

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

     // should throw an exception here

     ShouldNotReachHere();

   }

 #endif

   thread->set_vm_result(exception);

   // Frame not compiled (handles deoptimization blob)

   return SharedRuntime::raw_exception_handler_for_return_address(thread, ret_pc);

 }

 const TypeFunc *OptoRuntime::rethrow_Type() {

   // create input type (domain)

   const Type **fields = TypeTuple::fields(1);

   fields[TypeFunc::Parms+0] = TypeInstPtr::NOTNULL; // Exception oop

   const TypeTuple *domain = TypeTuple::make(TypeFunc::Parms+1,fields);

   // create result type (range)

   fields = TypeTuple::fields(1);

   fields[TypeFunc::Parms+0] = TypeInstPtr::NOTNULL; // Exception oop

   const TypeTuple *range = TypeTuple::make(TypeFunc::Parms+1, fields);

   return TypeFunc::make(domain, range);

 }

 void OptoRuntime::deoptimize_caller_frame(JavaThread *thread, bool doit) {

   // Deoptimize the caller before continuing, as the compiled

   // exception handler table may not be valid.

   if (!StressCompiledExceptionHandlers && doit) {

     deoptimize_caller_frame(thread);

   }

 }

 void OptoRuntime::deoptimize_caller_frame(JavaThread *thread) {

   // Called from within the owner thread, so no need for safepoint

   RegisterMap reg_map(thread);

   frame stub_frame = thread->last_frame();

   assert(stub_frame.is_runtime_frame() || exception_blob()->contains(stub_frame.pc()), "sanity check");

   frame caller_frame = stub_frame.sender(&reg_map);

   // Deoptimize the caller frame.

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

 }

 bool OptoRuntime::is_deoptimized_caller_frame(JavaThread *thread) {

   // Called from within the owner thread, so no need for safepoint

   RegisterMap reg_map(thread);

   frame stub_frame = thread->last_frame();

   assert(stub_frame.is_runtime_frame() || exception_blob()->contains(stub_frame.pc()), "sanity check");

   frame caller_frame = stub_frame.sender(&reg_map);

   return caller_frame.is_deoptimized_frame();

 }

 const TypeFunc *OptoRuntime::register_finalizer_Type() {

   // create input type (domain)

   const Type **fields = TypeTuple::fields(1);

   fields[TypeFunc::Parms+0] = TypeInstPtr::NOTNULL;  // oop;          Receiver

   // // The JavaThread* is passed to each routine as the last argument

   // fields[TypeFunc::Parms+1] = TypeRawPtr::NOTNULL;  // JavaThread *; Executing thread

   const TypeTuple *domain = TypeTuple::make(TypeFunc::Parms+1,fields);

   // create result type (range)

   fields = TypeTuple::fields(0);

   const TypeTuple *range = TypeTuple::make(TypeFunc::Parms+0,fields);

   return TypeFunc::make(domain,range);

 }

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

 // Dtrace support.  entry and exit probes have the same signature

 const TypeFunc *OptoRuntime::dtrace_method_entry_exit_Type() {

   // create input type (domain)

   const Type **fields = TypeTuple::fields(2);

   fields[TypeFunc::Parms+0] = TypeRawPtr::BOTTOM; // Thread-local storage

   fields[TypeFunc::Parms+1] = TypeMetadataPtr::BOTTOM;  // Method*;    Method we are entering

   const TypeTuple *domain = TypeTuple::make(TypeFunc::Parms+2,fields);

   // create result type (range)

   fields = TypeTuple::fields(0);

   const TypeTuple *range = TypeTuple::make(TypeFunc::Parms+0,fields);

   return TypeFunc::make(domain,range);

 }

 const TypeFunc *OptoRuntime::dtrace_object_alloc_Type() {

   // create input type (domain)

   const Type **fields = TypeTuple::fields(2);

   fields[TypeFunc::Parms+0] = TypeRawPtr::BOTTOM; // Thread-local storage

   fields[TypeFunc::Parms+1] = TypeInstPtr::NOTNULL;  // oop;    newly allocated object

   const TypeTuple *domain = TypeTuple::make(TypeFunc::Parms+2,fields);

   // create result type (range)

   fields = TypeTuple::fields(0);

   const TypeTuple *range = TypeTuple::make(TypeFunc::Parms+0,fields);

   return TypeFunc::make(domain,range);

 }

 JRT_ENTRY_NO_ASYNC(void, OptoRuntime::register_finalizer(oopDesc* obj, JavaThread* thread))

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

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

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

 JRT_END

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

 NamedCounter * volatile OptoRuntime::_named_counters = NULL;

 //

 // dump the collected NamedCounters.

 //

 void OptoRuntime::print_named_counters() {

   int total_lock_count = 0;

   int eliminated_lock_count = 0;

   NamedCounter* c = _named_counters;

   while (c) {

     if (c->tag() == NamedCounter::LockCounter || c->tag() == NamedCounter::EliminatedLockCounter) {

       int count = c->count();

       if (count > 0) {

         bool eliminated = c->tag() == NamedCounter::EliminatedLockCounter;

         if (Verbose) {

           tty->print_cr("%d %s%s", count, c->name(), eliminated ? " (eliminated)" : "");

         }

         total_lock_count += count;

         if (eliminated) {

           eliminated_lock_count += count;

         }

       }

     } else if (c->tag() == NamedCounter::BiasedLockingCounter) {

       BiasedLockingCounters* blc = ((BiasedLockingNamedCounter*)c)->counters();

       if (blc->nonzero()) {

         tty->print_cr("%s", c->name());

         blc->print_on(tty);

       }

 #if INCLUDE_RTM_OPT

     } else if (c->tag() == NamedCounter::RTMLockingCounter) {

       RTMLockingCounters* rlc = ((RTMLockingNamedCounter*)c)->counters();

       if (rlc->nonzero()) {

         tty->print_cr("%s", c->name());

         rlc->print_on(tty);

       }

 #endif

     }

     c = c->next();

   }

   if (total_lock_count > 0) {

     tty->print_cr("dynamic locks: %d", total_lock_count);

     if (eliminated_lock_count) {

       tty->print_cr("eliminated locks: %d (%d%%)", eliminated_lock_count,

                     (int)(eliminated_lock_count * 100.0 / total_lock_count));

     }

   }

 }

 //

 //  Allocate a new NamedCounter.  The JVMState is used to generate the

 //  name which consists of method@line for the inlining tree.

 //

 NamedCounter* OptoRuntime::new_named_counter(JVMState* youngest_jvms, NamedCounter::CounterTag tag) {

   int max_depth = youngest_jvms->depth();

   // Visit scopes from youngest to oldest.

   bool first = true;

   stringStream st;

   for (int depth = max_depth; depth >= 1; depth--) {

     JVMState* jvms = youngest_jvms->of_depth(depth);

     ciMethod* m = jvms->has_method() ? jvms->method() : NULL;

     if (!first) {

       st.print(" ");

     } else {

       first = false;

     }

     int bci = jvms->bci();

     if (bci < 0) bci = 0;

     st.print("%s.%s@%d", m->holder()->name()->as_utf8(), m->name()->as_utf8(), bci);

     // To print linenumbers instead of bci use: m->line_number_from_bci(bci)

   }

   NamedCounter* c;

   if (tag == NamedCounter::BiasedLockingCounter) {

     c = new BiasedLockingNamedCounter(strdup(st.as_string()));

   } else if (tag == NamedCounter::RTMLockingCounter) {

     c = new RTMLockingNamedCounter(strdup(st.as_string()));

   } else {

     c = new NamedCounter(strdup(st.as_string()), tag);

   }

   // atomically add the new counter to the head of the list.  We only

   // add counters so this is safe.

   NamedCounter* head;

   do {

     c->set_next(NULL);

     head = _named_counters;

     c->set_next(head);

   } while (Atomic::cmpxchg_ptr(c, &_named_counters, head) != head);

   return c;

 }

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

 // Non-product code

 #ifndef PRODUCT

 int trace_exception_counter = 0;

 static void trace_exception(oop exception_oop, address exception_pc, const char* msg) {

   ttyLocker ttyl;

   trace_exception_counter++;

   tty->print("%d [Exception (%s): ", trace_exception_counter, msg);

   exception_oop->print_value();

   tty->print(" in ");

   CodeBlob* blob = CodeCache::find_blob(exception_pc);

   if (blob->is_nmethod()) {

     nmethod* nm = blob->as_nmethod_or_null();

     nm->method()->print_value();

   } else if (blob->is_runtime_stub()) {

     tty->print("<runtime-stub>");

   } else {

     tty->print("<unknown>");

   }

   tty->print(" at " INTPTR_FORMAT,  p2i(exception_pc));

   tty->print_cr("]");

 }

 #endif  // PRODUCT

 # ifdef ENABLE_ZAP_DEAD_LOCALS

 // Called from call sites in compiled code with oop maps (actually safepoints)

 // Zaps dead locals in first java frame.

 // Is entry because may need to lock to generate oop maps

 // Currently, only used for compiler frames, but someday may be used

 // for interpreter frames, too.

 int OptoRuntime::ZapDeadCompiledLocals_count = 0;

 // avoid pointers to member funcs with these helpers

 static bool is_java_frame(  frame* f) { return f->is_java_frame();   }

 static bool is_native_frame(frame* f) { return f->is_native_frame(); }

 void OptoRuntime::zap_dead_java_or_native_locals(JavaThread* thread,

                                                 bool (*is_this_the_right_frame_to_zap)(frame*)) {

   assert(JavaThread::current() == thread, "is this needed?");

   if ( !ZapDeadCompiledLocals )  return;

   bool skip = false;

        if ( ZapDeadCompiledLocalsFirst  ==  0  ) ; // nothing special

   else if ( ZapDeadCompiledLocalsFirst  >  ZapDeadCompiledLocals_count )  skip = true;

   else if ( ZapDeadCompiledLocalsFirst  == ZapDeadCompiledLocals_count )

     warning("starting zapping after skipping");

        if ( ZapDeadCompiledLocalsLast  ==  -1  ) ; // nothing special

   else if ( ZapDeadCompiledLocalsLast  <   ZapDeadCompiledLocals_count )  skip = true;

   else if ( ZapDeadCompiledLocalsLast  ==  ZapDeadCompiledLocals_count )

     warning("about to zap last zap");

   ++ZapDeadCompiledLocals_count; // counts skipped zaps, too

   if ( skip )  return;

   // find java frame and zap it

   for (StackFrameStream sfs(thread);  !sfs.is_done();  sfs.next()) {

     if (is_this_the_right_frame_to_zap(sfs.current()) ) {

       sfs.current()->zap_dead_locals(thread, sfs.register_map());

       return;

     }

   }

   warning("no frame found to zap in zap_dead_Java_locals_C");

 }

 JRT_LEAF(void, OptoRuntime::zap_dead_Java_locals_C(JavaThread* thread))

   zap_dead_java_or_native_locals(thread, is_java_frame);

 JRT_END

 // The following does not work because for one thing, the

 // thread state is wrong; it expects java, but it is native.

 // Also, the invariants in a native stub are different and

 // I'm not sure it is safe to have a MachCalRuntimeDirectNode

 // in there.

 // So for now, we do not zap in native stubs.

 JRT_LEAF(void, OptoRuntime::zap_dead_native_locals_C(JavaThread* thread))

   zap_dead_java_or_native_locals(thread, is_native_frame);

 JRT_END

 # endif