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 /*

  * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.

  * Copyright 2007, 2008, 2009, 2010, 2011 Red Hat, Inc.

  * 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/assembler.hpp"

 #include "interpreter/bytecodeHistogram.hpp"

 #include "interpreter/cppInterpreter.hpp"

 #include "interpreter/interpreter.hpp"

 #include "interpreter/interpreterGenerator.hpp"

 #include "interpreter/interpreterRuntime.hpp"

 #include "oops/arrayOop.hpp"

 #include "oops/methodDataOop.hpp"

 #include "oops/methodOop.hpp"

 #include "oops/oop.inline.hpp"

 #include "prims/jvmtiExport.hpp"

 #include "prims/jvmtiThreadState.hpp"

 #include "runtime/arguments.hpp"

 #include "runtime/deoptimization.hpp"

 #include "runtime/frame.inline.hpp"

 #include "runtime/interfaceSupport.hpp"

 #include "runtime/sharedRuntime.hpp"

 #include "runtime/stubRoutines.hpp"

 #include "runtime/synchronizer.hpp"

 #include "runtime/timer.hpp"

 #include "runtime/vframeArray.hpp"

 #include "stack_zero.inline.hpp"

 #include "utilities/debug.hpp"

 #ifdef SHARK

 #include "shark/shark_globals.hpp"

 #endif

 #ifdef CC_INTERP

 #define fixup_after_potential_safepoint()       \

   method = istate->method()

 #define CALL_VM_NOCHECK_NOFIX(func)             \

   thread->set_last_Java_frame();                \

   func;                                         \

   thread->reset_last_Java_frame();

 #define CALL_VM_NOCHECK(func)                   \

   CALL_VM_NOCHECK_NOFIX(func)                   \

   fixup_after_potential_safepoint()

 int CppInterpreter::normal_entry(methodOop method, intptr_t UNUSED, TRAPS) {

   JavaThread *thread = (JavaThread *) THREAD;

   // Allocate and initialize our frame.

   InterpreterFrame *frame = InterpreterFrame::build(method, CHECK_0);

   thread->push_zero_frame(frame);

   // Execute those bytecodes!

   main_loop(0, THREAD);

   // No deoptimized frames on the stack

   return 0;

 }

 void CppInterpreter::main_loop(int recurse, TRAPS) {

   JavaThread *thread = (JavaThread *) THREAD;

   ZeroStack *stack = thread->zero_stack();

   // If we are entering from a deopt we may need to call

   // ourself a few times in order to get to our frame.

   if (recurse)

     main_loop(recurse - 1, THREAD);

   InterpreterFrame *frame = thread->top_zero_frame()->as_interpreter_frame();

   interpreterState istate = frame->interpreter_state();

   methodOop method = istate->method();

   intptr_t *result = NULL;

   int result_slots = 0;

   while (true) {

     // We can set up the frame anchor with everything we want at

     // this point as we are thread_in_Java and no safepoints can

     // occur until we go to vm mode.  We do have to clear flags

     // on return from vm but that is it.

     thread->set_last_Java_frame();

     // Call the interpreter

     if (JvmtiExport::can_post_interpreter_events())

       BytecodeInterpreter::runWithChecks(istate);

     else

       BytecodeInterpreter::run(istate);

     fixup_after_potential_safepoint();

     // Clear the frame anchor

     thread->reset_last_Java_frame();

     // Examine the message from the interpreter to decide what to do

     if (istate->msg() == BytecodeInterpreter::call_method) {

       methodOop callee = istate->callee();

       // Trim back the stack to put the parameters at the top

       stack->set_sp(istate->stack() + 1);

       // Make the call

       Interpreter::invoke_method(callee, istate->callee_entry_point(), THREAD);

       fixup_after_potential_safepoint();

       // Convert the result

       istate->set_stack(stack->sp() - 1);

       // Restore the stack

       stack->set_sp(istate->stack_limit() + 1);

       // Resume the interpreter

       istate->set_msg(BytecodeInterpreter::method_resume);

     }

     else if (istate->msg() == BytecodeInterpreter::more_monitors) {

       int monitor_words = frame::interpreter_frame_monitor_size();

       // Allocate the space

       stack->overflow_check(monitor_words, THREAD);

       if (HAS_PENDING_EXCEPTION)

         break;

       stack->alloc(monitor_words * wordSize);

       // Move the expression stack contents

       for (intptr_t *p = istate->stack() + 1; p < istate->stack_base(); p++)

         *(p - monitor_words) = *p;

       // Move the expression stack pointers

       istate->set_stack_limit(istate->stack_limit() - monitor_words);

       istate->set_stack(istate->stack() - monitor_words);

       istate->set_stack_base(istate->stack_base() - monitor_words);

       // Zero the new monitor so the interpreter can find it.

       ((BasicObjectLock *) istate->stack_base())->set_obj(NULL);

       // Resume the interpreter

       istate->set_msg(BytecodeInterpreter::got_monitors);

     }

     else if (istate->msg() == BytecodeInterpreter::return_from_method) {

       // Copy the result into the caller's frame

       result_slots = type2size[result_type_of(method)];

       assert(result_slots >= 0 && result_slots <= 2, "what?");

       result = istate->stack() + result_slots;

       break;

     }

     else if (istate->msg() == BytecodeInterpreter::throwing_exception) {

       assert(HAS_PENDING_EXCEPTION, "should do");

       break;

     }

     else if (istate->msg() == BytecodeInterpreter::do_osr) {

       // Unwind the current frame

       thread->pop_zero_frame();

       // Remove any extension of the previous frame

       int extra_locals = method->max_locals() - method->size_of_parameters();

       stack->set_sp(stack->sp() + extra_locals);

       // Jump into the OSR method

       Interpreter::invoke_osr(

         method, istate->osr_entry(), istate->osr_buf(), THREAD);

       return;

     }

     else if (istate->msg() == BytecodeInterpreter::call_method_handle) {

       oop method_handle = istate->callee();

       // Trim back the stack to put the parameters at the top

       stack->set_sp(istate->stack() + 1);

       // Make the call

       process_method_handle(method_handle, THREAD);

       fixup_after_potential_safepoint();

       // Convert the result

       istate->set_stack(stack->sp() - 1);

       // Restore the stack

       stack->set_sp(istate->stack_limit() + 1);

       // Resume the interpreter

       istate->set_msg(BytecodeInterpreter::method_resume);

     }

     else {

       ShouldNotReachHere();

     }

   }

   // Unwind the current frame

   thread->pop_zero_frame();

   // Pop our local variables

   stack->set_sp(stack->sp() + method->max_locals());

   // Push our result

   for (int i = 0; i < result_slots; i++)

     stack->push(result[-i]);

 }

 int CppInterpreter::native_entry(methodOop method, intptr_t UNUSED, TRAPS) {

   // Make sure method is native and not abstract

   assert(method->is_native() && !method->is_abstract(), "should be");

   JavaThread *thread = (JavaThread *) THREAD;

   ZeroStack *stack = thread->zero_stack();

   // Allocate and initialize our frame

   InterpreterFrame *frame = InterpreterFrame::build(method, CHECK_0);

   thread->push_zero_frame(frame);

   interpreterState istate = frame->interpreter_state();

   intptr_t *locals = istate->locals();

   // Update the invocation counter

   if ((UseCompiler || CountCompiledCalls) && !method->is_synchronized()) {

     InvocationCounter *counter = method->invocation_counter();

     counter->increment();

     if (counter->reached_InvocationLimit()) {

       CALL_VM_NOCHECK(

         InterpreterRuntime::frequency_counter_overflow(thread, NULL));

       if (HAS_PENDING_EXCEPTION)

         goto unwind_and_return;

     }

   }

   // Lock if necessary

   BasicObjectLock *monitor;

   monitor = NULL;

   if (method->is_synchronized()) {

     monitor = (BasicObjectLock*) istate->stack_base();

     oop lockee = monitor->obj();

     markOop disp = lockee->mark()->set_unlocked();

     monitor->lock()->set_displaced_header(disp);

     if (Atomic::cmpxchg_ptr(monitor, lockee->mark_addr(), disp) != disp) {

       if (thread->is_lock_owned((address) disp->clear_lock_bits())) {

         monitor->lock()->set_displaced_header(NULL);

       }

       else {

         CALL_VM_NOCHECK(InterpreterRuntime::monitorenter(thread, monitor));

         if (HAS_PENDING_EXCEPTION)

           goto unwind_and_return;

       }

     }

   }

   // Get the signature handler

   InterpreterRuntime::SignatureHandler *handler; {

     address handlerAddr = method->signature_handler();

     if (handlerAddr == NULL) {

       CALL_VM_NOCHECK(InterpreterRuntime::prepare_native_call(thread, method));

       if (HAS_PENDING_EXCEPTION)

         goto unlock_unwind_and_return;

       handlerAddr = method->signature_handler();

       assert(handlerAddr != NULL, "eh?");

     }

     if (handlerAddr == (address) InterpreterRuntime::slow_signature_handler) {

       CALL_VM_NOCHECK(handlerAddr =

         InterpreterRuntime::slow_signature_handler(thread, method, NULL,NULL));

       if (HAS_PENDING_EXCEPTION)

         goto unlock_unwind_and_return;

     }

     handler = \

       InterpreterRuntime::SignatureHandler::from_handlerAddr(handlerAddr);

   }

   // Get the native function entry point

   address function;

   function = method->native_function();

   assert(function != NULL, "should be set if signature handler is");

   // Build the argument list

   stack->overflow_check(handler->argument_count() * 2, THREAD);

   if (HAS_PENDING_EXCEPTION)

     goto unlock_unwind_and_return;

   void **arguments;

   void *mirror; {

     arguments =

       (void **) stack->alloc(handler->argument_count() * sizeof(void **));

     void **dst = arguments;

     void *env = thread->jni_environment();

     *(dst++) = &env;

     if (method->is_static()) {

       istate->set_oop_temp(

         method->constants()->pool_holder()->java_mirror());

       mirror = istate->oop_temp_addr();

       *(dst++) = &mirror;

     }

     intptr_t *src = locals;

     for (int i = dst - arguments; i < handler->argument_count(); i++) {

       ffi_type *type = handler->argument_type(i);

       if (type == &ffi_type_pointer) {

         if (*src) {

           stack->push((intptr_t) src);

           *(dst++) = stack->sp();

         }

         else {

           *(dst++) = src;

         }

         src--;

       }

       else if (type->size == 4) {

         *(dst++) = src--;

       }

       else if (type->size == 8) {

         src--;

         *(dst++) = src--;

       }

       else {

         ShouldNotReachHere();

       }

     }

   }

   // Set up the Java frame anchor

   thread->set_last_Java_frame();

   // Change the thread state to _thread_in_native

   ThreadStateTransition::transition_from_java(thread, _thread_in_native);

   // Make the call

   intptr_t result[4 - LogBytesPerWord];

   ffi_call(handler->cif(), (void (*)()) function, result, arguments);

   // Change the thread state back to _thread_in_Java.

   // ThreadStateTransition::transition_from_native() cannot be used

   // here because it does not check for asynchronous exceptions.

   // We have to manage the transition ourself.

   thread->set_thread_state(_thread_in_native_trans);

   // Make sure new state is visible in the GC thread

   if (os::is_MP()) {

     if (UseMembar) {

       OrderAccess::fence();

     }

     else {

       InterfaceSupport::serialize_memory(thread);

     }

   }

   // Handle safepoint operations, pending suspend requests,

   // and pending asynchronous exceptions.

   if (SafepointSynchronize::do_call_back() ||

       thread->has_special_condition_for_native_trans()) {

     JavaThread::check_special_condition_for_native_trans(thread);

     CHECK_UNHANDLED_OOPS_ONLY(thread->clear_unhandled_oops());

   }

   // Finally we can change the thread state to _thread_in_Java.

   thread->set_thread_state(_thread_in_Java);

   fixup_after_potential_safepoint();

   // Clear the frame anchor

   thread->reset_last_Java_frame();

   // If the result was an oop then unbox it and store it in

   // oop_temp where the garbage collector can see it before

   // we release the handle it might be protected by.

   if (handler->result_type() == &ffi_type_pointer) {

     if (result[0])

       istate->set_oop_temp(*(oop *) result[0]);

     else

       istate->set_oop_temp(NULL);

   }

   // Reset handle block

   thread->active_handles()->clear();

  unlock_unwind_and_return:

   // Unlock if necessary

   if (monitor) {

     BasicLock *lock = monitor->lock();

     markOop header = lock->displaced_header();

     oop rcvr = monitor->obj();

     monitor->set_obj(NULL);

     if (header != NULL) {

       if (Atomic::cmpxchg_ptr(header, rcvr->mark_addr(), lock) != lock) {

         monitor->set_obj(rcvr); {

           HandleMark hm(thread);

           CALL_VM_NOCHECK(InterpreterRuntime::monitorexit(thread, monitor));

         }

       }

     }

   }

  unwind_and_return:

   // Unwind the current activation

   thread->pop_zero_frame();

   // Pop our parameters

   stack->set_sp(stack->sp() + method->size_of_parameters());

   // Push our result

   if (!HAS_PENDING_EXCEPTION) {

     BasicType type = result_type_of(method);

     stack->set_sp(stack->sp() - type2size[type]);

     switch (type) {

     case T_VOID:

       break;

     case T_BOOLEAN:

 #ifndef VM_LITTLE_ENDIAN

       result[0] <<= (BitsPerWord - BitsPerByte);

 #endif

       SET_LOCALS_INT(*(jboolean *) result != 0, 0);

       break;

     case T_CHAR:

 #ifndef VM_LITTLE_ENDIAN

       result[0] <<= (BitsPerWord - BitsPerShort);

 #endif

       SET_LOCALS_INT(*(jchar *) result, 0);

       break;

     case T_BYTE:

 #ifndef VM_LITTLE_ENDIAN

       result[0] <<= (BitsPerWord - BitsPerByte);

 #endif

       SET_LOCALS_INT(*(jbyte *) result, 0);

       break;

     case T_SHORT:

 #ifndef VM_LITTLE_ENDIAN

       result[0] <<= (BitsPerWord - BitsPerShort);

 #endif

       SET_LOCALS_INT(*(jshort *) result, 0);

       break;

     case T_INT:

 #ifndef VM_LITTLE_ENDIAN

       result[0] <<= (BitsPerWord - BitsPerInt);

 #endif

       SET_LOCALS_INT(*(jint *) result, 0);

       break;

     case T_LONG:

       SET_LOCALS_LONG(*(jlong *) result, 0);

       break;

     case T_FLOAT:

       SET_LOCALS_FLOAT(*(jfloat *) result, 0);

       break;

     case T_DOUBLE:

       SET_LOCALS_DOUBLE(*(jdouble *) result, 0);

       break;

     case T_OBJECT:

     case T_ARRAY:

       SET_LOCALS_OBJECT(istate->oop_temp(), 0);

       break;

     default:

       ShouldNotReachHere();

     }

   }

   // No deoptimized frames on the stack

   return 0;

 }

 int CppInterpreter::accessor_entry(methodOop method, intptr_t UNUSED, TRAPS) {

   JavaThread *thread = (JavaThread *) THREAD;

   ZeroStack *stack = thread->zero_stack();

   intptr_t *locals = stack->sp();

   // Drop into the slow path if we need a safepoint check

   if (SafepointSynchronize::do_call_back()) {

     return normal_entry(method, 0, THREAD);

   }

   // Load the object pointer and drop into the slow path

   // if we have a NullPointerException

   oop object = LOCALS_OBJECT(0);

   if (object == NULL) {

     return normal_entry(method, 0, THREAD);

   }

   // Read the field index from the bytecode, which looks like this:

   //  0:  aload_0

   //  1:  getfield

   //  2:    index

   //  3:    index

   //  4:  ireturn/areturn

   // NB this is not raw bytecode: index is in machine order

   u1 *code = method->code_base();

   assert(code[0] == Bytecodes::_aload_0 &&

          code[1] == Bytecodes::_getfield &&

          (code[4] == Bytecodes::_ireturn ||

           code[4] == Bytecodes::_areturn), "should do");

   u2 index = Bytes::get_native_u2(&code[2]);

   // Get the entry from the constant pool cache, and drop into

   // the slow path if it has not been resolved

   constantPoolCacheOop cache = method->constants()->cache();

   ConstantPoolCacheEntry* entry = cache->entry_at(index);

   if (!entry->is_resolved(Bytecodes::_getfield)) {

     return normal_entry(method, 0, THREAD);

   }

   // Get the result and push it onto the stack

   switch (entry->flag_state()) {

   case ltos:

   case dtos:

     stack->overflow_check(1, CHECK_0);

     stack->alloc(wordSize);

     break;

   }

   if (entry->is_volatile()) {

     switch (entry->flag_state()) {

     case ctos:

       SET_LOCALS_INT(object->char_field_acquire(entry->f2()), 0);

       break;

     case btos:

       SET_LOCALS_INT(object->byte_field_acquire(entry->f2()), 0);

       break;

     case stos:

       SET_LOCALS_INT(object->short_field_acquire(entry->f2()), 0);

       break;

     case itos:

       SET_LOCALS_INT(object->int_field_acquire(entry->f2()), 0);

       break;

     case ltos:

       SET_LOCALS_LONG(object->long_field_acquire(entry->f2()), 0);

       break;

     case ftos:

       SET_LOCALS_FLOAT(object->float_field_acquire(entry->f2()), 0);

       break;

     case dtos:

       SET_LOCALS_DOUBLE(object->double_field_acquire(entry->f2()), 0);

       break;

     case atos:

       SET_LOCALS_OBJECT(object->obj_field_acquire(entry->f2()), 0);

       break;

     default:

       ShouldNotReachHere();

     }

   }

   else {

     switch (entry->flag_state()) {

     case ctos:

       SET_LOCALS_INT(object->char_field(entry->f2()), 0);

       break;

     case btos:

       SET_LOCALS_INT(object->byte_field(entry->f2()), 0);

       break;

     case stos:

       SET_LOCALS_INT(object->short_field(entry->f2()), 0);

       break;

     case itos:

       SET_LOCALS_INT(object->int_field(entry->f2()), 0);

       break;

     case ltos:

       SET_LOCALS_LONG(object->long_field(entry->f2()), 0);

       break;

     case ftos:

       SET_LOCALS_FLOAT(object->float_field(entry->f2()), 0);

       break;

     case dtos:

       SET_LOCALS_DOUBLE(object->double_field(entry->f2()), 0);

       break;

     case atos:

       SET_LOCALS_OBJECT(object->obj_field(entry->f2()), 0);

       break;

     default:

       ShouldNotReachHere();

     }

   }

   // No deoptimized frames on the stack

   return 0;

 }

 int CppInterpreter::empty_entry(methodOop method, intptr_t UNUSED, TRAPS) {

   JavaThread *thread = (JavaThread *) THREAD;

   ZeroStack *stack = thread->zero_stack();

   // Drop into the slow path if we need a safepoint check

   if (SafepointSynchronize::do_call_back()) {

     return normal_entry(method, 0, THREAD);

   }

   // Pop our parameters

   stack->set_sp(stack->sp() + method->size_of_parameters());

   // No deoptimized frames on the stack

   return 0;

 }

 int CppInterpreter::method_handle_entry(methodOop method,

                                         intptr_t UNUSED, TRAPS) {

   JavaThread *thread = (JavaThread *) THREAD;

   ZeroStack *stack = thread->zero_stack();

   int argument_slots = method->size_of_parameters();

   int result_slots = type2size[result_type_of(method)];

   intptr_t *vmslots = stack->sp();

   intptr_t *unwind_sp = vmslots + argument_slots;

   // Find the MethodType

   address p = (address) method;

   for (jint* pc = method->method_type_offsets_chain(); (*pc) != -1; pc++) {

     p = *(address*)(p + (*pc));

   }

   oop method_type = (oop) p;

   // The MethodHandle is in the slot after the arguments

   oop form = java_lang_invoke_MethodType::form(method_type);

   int num_vmslots = java_lang_invoke_MethodTypeForm::vmslots(form);

   assert(argument_slots == num_vmslots + 1, "should be");

   oop method_handle = VMSLOTS_OBJECT(num_vmslots);

   // InvokeGeneric requires some extra shuffling

   oop mhtype = java_lang_invoke_MethodHandle::type(method_handle);

   bool is_exact = mhtype == method_type;

   if (!is_exact) {

     if (method->intrinsic_id() == vmIntrinsics::_invokeExact) {

       CALL_VM_NOCHECK_NOFIX(

         SharedRuntime::throw_WrongMethodTypeException(

           thread, method_type, mhtype));

       // NB all oops trashed!

       assert(HAS_PENDING_EXCEPTION, "should do");

       stack->set_sp(unwind_sp);

       return 0;

     }

     assert(method->intrinsic_id() == vmIntrinsics::_invokeGeneric, "should be");

     // Load up an adapter from the calling type

     // NB the x86 code for this (in methodHandles_x86.cpp, search for

     // "genericInvoker") is really really odd.  I'm hoping it's trying

     // to accomodate odd VM/class library combinations I can ignore.

     oop adapter = java_lang_invoke_MethodTypeForm::genericInvoker(form);

     if (adapter == NULL) {

       CALL_VM_NOCHECK_NOFIX(

         SharedRuntime::throw_WrongMethodTypeException(

           thread, method_type, mhtype));

       // NB all oops trashed!

       assert(HAS_PENDING_EXCEPTION, "should do");

       stack->set_sp(unwind_sp);

       return 0;

     }

     // Adapters are shared among form-families of method-type.  The

     // type being called is passed as a trusted first argument so that

     // the adapter knows the actual types of its arguments and return

     // values.

     insert_vmslots(num_vmslots + 1, 1, THREAD);

     if (HAS_PENDING_EXCEPTION) {

       // NB all oops trashed!

       stack->set_sp(unwind_sp);

       return 0;

     }

     vmslots = stack->sp();

     num_vmslots++;

     SET_VMSLOTS_OBJECT(method_type, num_vmslots);

     method_handle = adapter;

   }

   // Start processing

   process_method_handle(method_handle, THREAD);

   if (HAS_PENDING_EXCEPTION)

     result_slots = 0;

   // If this is an invokeExact then the eventual callee will not

   // have unwound the method handle argument so we have to do it.

   // If a result is being returned the it will be above the method

   // handle argument we're unwinding.

   if (is_exact) {

     intptr_t result[2];

     for (int i = 0; i < result_slots; i++)

       result[i] = stack->pop();

     stack->pop();

     for (int i = result_slots - 1; i >= 0; i--)

       stack->push(result[i]);

   }

   // Check

   assert(stack->sp() == unwind_sp - result_slots, "should be");

   // No deoptimized frames on the stack

   return 0;

 }

 void CppInterpreter::process_method_handle(oop method_handle, TRAPS) {

   JavaThread *thread = (JavaThread *) THREAD;

   ZeroStack *stack = thread->zero_stack();

   intptr_t *vmslots = stack->sp();

   bool direct_to_method = false;

   BasicType src_rtype = T_ILLEGAL;

   BasicType dst_rtype = T_ILLEGAL;

   MethodHandleEntry *entry =

     java_lang_invoke_MethodHandle::vmentry(method_handle);

   MethodHandles::EntryKind entry_kind =

     (MethodHandles::EntryKind) (((intptr_t) entry) & 0xffffffff);

   methodOop method = NULL;

   switch (entry_kind) {

   case MethodHandles::_invokestatic_mh:

     direct_to_method = true;

     break;

   case MethodHandles::_invokespecial_mh:

   case MethodHandles::_invokevirtual_mh:

   case MethodHandles::_invokeinterface_mh:

     {

       oop receiver =

         VMSLOTS_OBJECT(

           java_lang_invoke_MethodHandle::vmslots(method_handle) - 1);

       if (receiver == NULL) {

           stack->set_sp(calculate_unwind_sp(stack, method_handle));

           CALL_VM_NOCHECK_NOFIX(

             throw_exception(

               thread, vmSymbols::java_lang_NullPointerException()));

           // NB all oops trashed!

           assert(HAS_PENDING_EXCEPTION, "should do");

           return;

       }

       if (entry_kind != MethodHandles::_invokespecial_mh) {

         int index = java_lang_invoke_DirectMethodHandle::vmindex(method_handle);

         instanceKlass* rcvrKlass =

           (instanceKlass *) receiver->klass()->klass_part();

         if (entry_kind == MethodHandles::_invokevirtual_mh) {

           method = (methodOop) rcvrKlass->start_of_vtable()[index];

         }

         else {

           oop iclass = java_lang_invoke_MethodHandle::vmtarget(method_handle);

           itableOffsetEntry* ki =

             (itableOffsetEntry *) rcvrKlass->start_of_itable();

           int i, length = rcvrKlass->itable_length();

           for (i = 0; i < length; i++, ki++ ) {

             if (ki->interface_klass() == iclass)

               break;

           }

           if (i == length) {

             stack->set_sp(calculate_unwind_sp(stack, method_handle));

             CALL_VM_NOCHECK_NOFIX(

               throw_exception(

                 thread, vmSymbols::java_lang_IncompatibleClassChangeError()));

             // NB all oops trashed!

             assert(HAS_PENDING_EXCEPTION, "should do");

             return;

           }

           itableMethodEntry* im = ki->first_method_entry(receiver->klass());

           method = im[index].method();

           if (method == NULL) {

             stack->set_sp(calculate_unwind_sp(stack, method_handle));

             CALL_VM_NOCHECK_NOFIX(

               throw_exception(

                 thread, vmSymbols::java_lang_AbstractMethodError()));

             // NB all oops trashed!

             assert(HAS_PENDING_EXCEPTION, "should do");

             return;

           }

         }

       }

     }

     direct_to_method = true;

     break;

   case MethodHandles::_bound_ref_direct_mh:

   case MethodHandles::_bound_int_direct_mh:

   case MethodHandles::_bound_long_direct_mh:

     direct_to_method = true;

     // fall through

   case MethodHandles::_bound_ref_mh:

   case MethodHandles::_bound_int_mh:

   case MethodHandles::_bound_long_mh:

     {

       BasicType arg_type  = T_ILLEGAL;

       int       arg_mask  = -1;

       int       arg_slots = -1;

       MethodHandles::get_ek_bound_mh_info(

         entry_kind, arg_type, arg_mask, arg_slots);

       int arg_slot =

         java_lang_invoke_BoundMethodHandle::vmargslot(method_handle);

       // Create the new slot(s)

       intptr_t *unwind_sp = calculate_unwind_sp(stack, method_handle);

       insert_vmslots(arg_slot, arg_slots, THREAD);

       if (HAS_PENDING_EXCEPTION) {

         // all oops trashed

         stack->set_sp(unwind_sp);

         return;

       }

       vmslots = stack->sp();

       // Store bound argument into new stack slot

       oop arg = java_lang_invoke_BoundMethodHandle::argument(method_handle);

       if (arg_type == T_OBJECT) {

         assert(arg_slots == 1, "should be");

         SET_VMSLOTS_OBJECT(arg, arg_slot);

       }

       else {

         jvalue arg_value;

         arg_type = java_lang_boxing_object::get_value(arg, &arg_value);

         switch (arg_type) {

         case T_BOOLEAN:

           SET_VMSLOTS_INT(arg_value.z, arg_slot);

           break;

         case T_CHAR:

           SET_VMSLOTS_INT(arg_value.c, arg_slot);

           break;

         case T_BYTE:

           SET_VMSLOTS_INT(arg_value.b, arg_slot);

           break;

         case T_SHORT:

           SET_VMSLOTS_INT(arg_value.s, arg_slot);

           break;

         case T_INT:

           SET_VMSLOTS_INT(arg_value.i, arg_slot);

           break;

         case T_FLOAT:

           SET_VMSLOTS_FLOAT(arg_value.f, arg_slot);

           break;

         case T_LONG:

           SET_VMSLOTS_LONG(arg_value.j, arg_slot + 1);

           break;

         case T_DOUBLE:

           SET_VMSLOTS_DOUBLE(arg_value.d, arg_slot + 1);

           break;

         default:

           tty->print_cr("unhandled type %s", type2name(arg_type));

           ShouldNotReachHere();

         }

       }

     }

     break;

   case MethodHandles::_adapter_retype_only:

   case MethodHandles::_adapter_retype_raw:

     src_rtype = result_type_of_handle(

       java_lang_invoke_MethodHandle::vmtarget(method_handle));

     dst_rtype = result_type_of_handle(method_handle);

     break;

   case MethodHandles::_adapter_check_cast:

     {

       int arg_slot =

         java_lang_invoke_AdapterMethodHandle::vmargslot(method_handle);

       oop arg = VMSLOTS_OBJECT(arg_slot);

       if (arg != NULL) {

         klassOop objKlassOop = arg->klass();

         klassOop klassOf = java_lang_Class::as_klassOop(

           java_lang_invoke_AdapterMethodHandle::argument(method_handle));

         if (objKlassOop != klassOf &&

             !objKlassOop->klass_part()->is_subtype_of(klassOf)) {

           ResourceMark rm(THREAD);

           const char* objName = Klass::cast(objKlassOop)->external_name();

           const char* klassName = Klass::cast(klassOf)->external_name();

           char* message = SharedRuntime::generate_class_cast_message(

             objName, klassName);

           stack->set_sp(calculate_unwind_sp(stack, method_handle));

           CALL_VM_NOCHECK_NOFIX(

             throw_exception(

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

           // NB all oops trashed!

           assert(HAS_PENDING_EXCEPTION, "should do");

           return;

         }

       }

     }

     break;

   case MethodHandles::_adapter_dup_args:

     {

       int arg_slot =

         java_lang_invoke_AdapterMethodHandle::vmargslot(method_handle);

       int conv =

         java_lang_invoke_AdapterMethodHandle::conversion(method_handle);

       int num_slots = -MethodHandles::adapter_conversion_stack_move(conv);

       assert(num_slots > 0, "should be");

       // Create the new slot(s)

       intptr_t *unwind_sp = calculate_unwind_sp(stack, method_handle);

       stack->overflow_check(num_slots, THREAD);

       if (HAS_PENDING_EXCEPTION) {

         // all oops trashed

         stack->set_sp(unwind_sp);

         return;

       }

       // Duplicate the arguments

       for (int i = num_slots - 1; i >= 0; i--)

         stack->push(*VMSLOTS_SLOT(arg_slot + i));

       vmslots = stack->sp(); // unused, but let the compiler figure that out

     }

     break;

   case MethodHandles::_adapter_drop_args:

     {

       int arg_slot =

         java_lang_invoke_AdapterMethodHandle::vmargslot(method_handle);

       int conv =

         java_lang_invoke_AdapterMethodHandle::conversion(method_handle);

       int num_slots = MethodHandles::adapter_conversion_stack_move(conv);

       assert(num_slots > 0, "should be");

       remove_vmslots(arg_slot, num_slots, THREAD); // doesn't trap

       vmslots = stack->sp(); // unused, but let the compiler figure that out

     }

     break;

   case MethodHandles::_adapter_opt_swap_1:

   case MethodHandles::_adapter_opt_swap_2:

   case MethodHandles::_adapter_opt_rot_1_up:

   case MethodHandles::_adapter_opt_rot_1_down:

   case MethodHandles::_adapter_opt_rot_2_up:

   case MethodHandles::_adapter_opt_rot_2_down:

     {

       int arg1 =

         java_lang_invoke_AdapterMethodHandle::vmargslot(method_handle);

       int conv =

         java_lang_invoke_AdapterMethodHandle::conversion(method_handle);

       int arg2 = MethodHandles::adapter_conversion_vminfo(conv);

       int swap_bytes = 0, rotate = 0;

       MethodHandles::get_ek_adapter_opt_swap_rot_info(

         entry_kind, swap_bytes, rotate);

       int swap_slots = swap_bytes >> LogBytesPerWord;

       intptr_t tmp;

       switch (rotate) {

       case 0: // swap

         for (int i = 0; i < swap_slots; i++) {

           tmp = *VMSLOTS_SLOT(arg1 + i);

           SET_VMSLOTS_SLOT(VMSLOTS_SLOT(arg2 + i), arg1 + i);

           SET_VMSLOTS_SLOT(&tmp, arg2 + i);

         }

         break;

       case 1: // up

         assert(arg1 - swap_slots > arg2, "should be");

         tmp = *VMSLOTS_SLOT(arg1);

         for (int i = arg1 - swap_slots; i >= arg2; i--)

           SET_VMSLOTS_SLOT(VMSLOTS_SLOT(i), i + swap_slots);

         SET_VMSLOTS_SLOT(&tmp, arg2);

         break;

       case -1: // down

         assert(arg2 - swap_slots > arg1, "should be");

         tmp = *VMSLOTS_SLOT(arg1);

         for (int i = arg1 + swap_slots; i <= arg2; i++)

           SET_VMSLOTS_SLOT(VMSLOTS_SLOT(i), i - swap_slots);

         SET_VMSLOTS_SLOT(&tmp, arg2);

         break;

       default:

         ShouldNotReachHere();

       }

     }

     break;

   case MethodHandles::_adapter_opt_i2l:

     {

       int arg_slot =

         java_lang_invoke_AdapterMethodHandle::vmargslot(method_handle);

       int arg = VMSLOTS_INT(arg_slot);

       intptr_t *unwind_sp = calculate_unwind_sp(stack, method_handle);

       insert_vmslots(arg_slot, 1, THREAD);

       if (HAS_PENDING_EXCEPTION) {

         // all oops trashed

         stack->set_sp(unwind_sp);

         return;

       }

       vmslots = stack->sp();

       arg_slot++;

       SET_VMSLOTS_LONG(arg, arg_slot);

     }

     break;

   case MethodHandles::_adapter_opt_unboxi:

   case MethodHandles::_adapter_opt_unboxl:

     {

       int arg_slot =

         java_lang_invoke_AdapterMethodHandle::vmargslot(method_handle);

       oop arg = VMSLOTS_OBJECT(arg_slot);

       jvalue arg_value;

       if (arg == NULL) {

         // queue a nullpointer exception for the caller

         stack->set_sp(calculate_unwind_sp(stack, method_handle));

         CALL_VM_NOCHECK_NOFIX(

           throw_exception(

             thread, vmSymbols::java_lang_NullPointerException()));

         // NB all oops trashed!

         assert(HAS_PENDING_EXCEPTION, "should do");

         return;

       }

       BasicType arg_type = java_lang_boxing_object::get_value(arg, &arg_value);

       if (arg_type == T_LONG || arg_type == T_DOUBLE) {

         intptr_t *unwind_sp = calculate_unwind_sp(stack, method_handle);

         insert_vmslots(arg_slot, 1, THREAD);

         if (HAS_PENDING_EXCEPTION) {

           // all oops trashed

           stack->set_sp(unwind_sp);

           return;

         }

         vmslots = stack->sp();

         arg_slot++;

       }

       switch (arg_type) {

       case T_BOOLEAN:

         SET_VMSLOTS_INT(arg_value.z, arg_slot);

         break;

       case T_CHAR:

         SET_VMSLOTS_INT(arg_value.c, arg_slot);

         break;

       case T_BYTE:

         SET_VMSLOTS_INT(arg_value.b, arg_slot);

         break;

       case T_SHORT:

         SET_VMSLOTS_INT(arg_value.s, arg_slot);

         break;

       case T_INT:

         SET_VMSLOTS_INT(arg_value.i, arg_slot);

         break;

       case T_FLOAT:

         SET_VMSLOTS_FLOAT(arg_value.f, arg_slot);

         break;

       case T_LONG:

         SET_VMSLOTS_LONG(arg_value.j, arg_slot);

         break;

       case T_DOUBLE:

         SET_VMSLOTS_DOUBLE(arg_value.d, arg_slot);

         break;

       default:

         tty->print_cr("unhandled type %s", type2name(arg_type));

         ShouldNotReachHere();

       }

     }

     break;

   default:

     tty->print_cr("unhandled entry_kind %s",

                   MethodHandles::entry_name(entry_kind));

     ShouldNotReachHere();

   }

   // Continue along the chain

   if (direct_to_method) {

     if (method == NULL) {

       method =

         (methodOop) java_lang_invoke_MethodHandle::vmtarget(method_handle);

     }

     address entry_point = method->from_interpreted_entry();

     Interpreter::invoke_method(method, entry_point, THREAD);

   }

   else {

     process_method_handle(

       java_lang_invoke_MethodHandle::vmtarget(method_handle), THREAD);

   }

   // NB all oops now trashed

   // Adapt the result type, if necessary

   if (src_rtype != dst_rtype && !HAS_PENDING_EXCEPTION) {

     switch (dst_rtype) {

     case T_VOID:

       for (int i = 0; i < type2size[src_rtype]; i++)

         stack->pop();

       return;

     case T_INT:

       switch (src_rtype) {

       case T_VOID:

         stack->overflow_check(1, CHECK);

         stack->push(0);

         return;

       case T_BOOLEAN:

       case T_CHAR:

       case T_BYTE:

       case T_SHORT:

         return;

       }

       // INT results sometimes need narrowing

     case T_BOOLEAN:

     case T_CHAR:

     case T_BYTE:

     case T_SHORT:

       switch (src_rtype) {

       case T_INT:

         return;

       }

     }

     tty->print_cr("unhandled conversion:");

     tty->print_cr("src_rtype = %s", type2name(src_rtype));

     tty->print_cr("dst_rtype = %s", type2name(dst_rtype));

     ShouldNotReachHere();

   }

 }

 // The new slots will be inserted before slot insert_before.

 // Slots < insert_before will have the same slot number after the insert.

 // Slots >= insert_before will become old_slot + num_slots.

 void CppInterpreter::insert_vmslots(int insert_before, int num_slots, TRAPS) {

   JavaThread *thread = (JavaThread *) THREAD;

   ZeroStack *stack = thread->zero_stack();

   // Allocate the space

   stack->overflow_check(num_slots, CHECK);

   stack->alloc(num_slots * wordSize);

   intptr_t *vmslots = stack->sp();

   // Shuffle everything up

   for (int i = 0; i < insert_before; i++)

     SET_VMSLOTS_SLOT(VMSLOTS_SLOT(i + num_slots), i);

 }

 void CppInterpreter::remove_vmslots(int first_slot, int num_slots, TRAPS) {

   JavaThread *thread = (JavaThread *) THREAD;

   ZeroStack *stack = thread->zero_stack();

   intptr_t *vmslots = stack->sp();

   // Move everything down

   for (int i = first_slot - 1; i >= 0; i--)

     SET_VMSLOTS_SLOT(VMSLOTS_SLOT(i), i + num_slots);

   // Deallocate the space

   stack->set_sp(stack->sp() + num_slots);

 }

 BasicType CppInterpreter::result_type_of_handle(oop method_handle) {

   oop method_type = java_lang_invoke_MethodHandle::type(method_handle);

   oop return_type = java_lang_invoke_MethodType::rtype(method_type);

   return java_lang_Class::as_BasicType(return_type, (klassOop *) NULL);

 }

 intptr_t* CppInterpreter::calculate_unwind_sp(ZeroStack* stack,

                                               oop method_handle) {

   oop method_type = java_lang_invoke_MethodHandle::type(method_handle);

   oop form = java_lang_invoke_MethodType::form(method_type);

   int argument_slots = java_lang_invoke_MethodTypeForm::vmslots(form);

   return stack->sp() + argument_slots;

 }

 IRT_ENTRY(void, CppInterpreter::throw_exception(JavaThread* thread,

                                                 Symbol*     name,

                                                 char*       message))

   THROW_MSG(name, message);

 IRT_END

 InterpreterFrame *InterpreterFrame::build(const methodOop method, TRAPS) {

   JavaThread *thread = (JavaThread *) THREAD;

   ZeroStack *stack = thread->zero_stack();

   // Calculate the size of the frame we'll build, including

   // any adjustments to the caller's frame that we'll make.

   int extra_locals  = 0;

   int monitor_words = 0;

   int stack_words   = 0;

   if (!method->is_native()) {

     extra_locals = method->max_locals() - method->size_of_parameters();

     stack_words  = method->max_stack();

   }

   if (method->is_synchronized()) {

     monitor_words = frame::interpreter_frame_monitor_size();

   }

   stack->overflow_check(

     extra_locals + header_words + monitor_words + stack_words, CHECK_NULL);

   // Adjust the caller's stack frame to accomodate any additional

   // local variables we have contiguously with our parameters.

   for (int i = 0; i < extra_locals; i++)

     stack->push(0);

   intptr_t *locals;

   if (method->is_native())

     locals = stack->sp() + (method->size_of_parameters() - 1);

   else

     locals = stack->sp() + (method->max_locals() - 1);

   stack->push(0); // next_frame, filled in later

   intptr_t *fp = stack->sp();

   assert(fp - stack->sp() == next_frame_off, "should be");

   stack->push(INTERPRETER_FRAME);

   assert(fp - stack->sp() == frame_type_off, "should be");

   interpreterState istate =

     (interpreterState) stack->alloc(sizeof(BytecodeInterpreter));

   assert(fp - stack->sp() == istate_off, "should be");

   istate->set_locals(locals);

   istate->set_method(method);

   istate->set_self_link(istate);

   istate->set_prev_link(NULL);

   istate->set_thread(thread);

   istate->set_bcp(method->is_native() ? NULL : method->code_base());

   istate->set_constants(method->constants()->cache());

   istate->set_msg(BytecodeInterpreter::method_entry);

   istate->set_oop_temp(NULL);

   istate->set_mdx(NULL);

   istate->set_callee(NULL);

   istate->set_monitor_base((BasicObjectLock *) stack->sp());

   if (method->is_synchronized()) {

     BasicObjectLock *monitor =

       (BasicObjectLock *) stack->alloc(monitor_words * wordSize);

     oop object;

     if (method->is_static())

       object = method->constants()->pool_holder()->java_mirror();

     else

       object = (oop) locals[0];

     monitor->set_obj(object);

   }

   istate->set_stack_base(stack->sp());

   istate->set_stack(stack->sp() - 1);

   if (stack_words)

     stack->alloc(stack_words * wordSize);

   istate->set_stack_limit(stack->sp() - 1);

   return (InterpreterFrame *) fp;

 }

 int AbstractInterpreter::BasicType_as_index(BasicType type) {

   int i = 0;

   switch (type) {

     case T_BOOLEAN: i = 0; break;

     case T_CHAR   : i = 1; break;

     case T_BYTE   : i = 2; break;

     case T_SHORT  : i = 3; break;

     case T_INT    : i = 4; break;

     case T_LONG   : i = 5; break;

     case T_VOID   : i = 6; break;

     case T_FLOAT  : i = 7; break;

     case T_DOUBLE : i = 8; break;

     case T_OBJECT : i = 9; break;

     case T_ARRAY  : i = 9; break;

     default       : ShouldNotReachHere();

   }

   assert(0 <= i && i < AbstractInterpreter::number_of_result_handlers,

          "index out of bounds");

   return i;

 }

 BasicType CppInterpreter::result_type_of(methodOop method) {

   BasicType t;

   switch (method->result_index()) {

     case 0 : t = T_BOOLEAN; break;

     case 1 : t = T_CHAR;    break;

     case 2 : t = T_BYTE;    break;

     case 3 : t = T_SHORT;   break;

     case 4 : t = T_INT;     break;

     case 5 : t = T_LONG;    break;

     case 6 : t = T_VOID;    break;

     case 7 : t = T_FLOAT;   break;

     case 8 : t = T_DOUBLE;  break;

     case 9 : t = T_OBJECT;  break;

     default: ShouldNotReachHere();

   }

   assert(AbstractInterpreter::BasicType_as_index(t) == method->result_index(),

          "out of step with AbstractInterpreter::BasicType_as_index");

   return t;

 }

 address InterpreterGenerator::generate_empty_entry() {

   if (!UseFastEmptyMethods)

     return NULL;

   return generate_entry((address) CppInterpreter::empty_entry);

 }

 address InterpreterGenerator::generate_accessor_entry() {

   if (!UseFastAccessorMethods)

     return NULL;

   return generate_entry((address) CppInterpreter::accessor_entry);

 }

 address InterpreterGenerator::generate_Reference_get_entry(void) {

 #ifndef SERIALGC

   if (UseG1GC) {

     // We need to generate have a routine that generates code to:

     //   * load the value in the referent field

     //   * passes that value to the pre-barrier.

     //

     // In the case of G1 this will record the value of the

     // referent in an SATB buffer if marking is active.

     // This will cause concurrent marking to mark the referent

     // field as live.

     Unimplemented();

   }

 #endif // SERIALGC

   // If G1 is not enabled then attempt to go through the accessor entry point

   // Reference.get is an accessor

   return generate_accessor_entry();

 }

 address InterpreterGenerator::generate_native_entry(bool synchronized) {

   assert(synchronized == false, "should be");

   return generate_entry((address) CppInterpreter::native_entry);

 }

 address InterpreterGenerator::generate_normal_entry(bool synchronized) {

   assert(synchronized == false, "should be");

   return generate_entry((address) CppInterpreter::normal_entry);

 }

 address AbstractInterpreterGenerator::generate_method_entry(

     AbstractInterpreter::MethodKind kind) {

   address entry_point = NULL;

   switch (kind) {

   case Interpreter::zerolocals:

   case Interpreter::zerolocals_synchronized:

     break;

   case Interpreter::native:

     entry_point = ((InterpreterGenerator*) this)->generate_native_entry(false);

     break;

   case Interpreter::native_synchronized:

     entry_point = ((InterpreterGenerator*) this)->generate_native_entry(false);

     break;

   case Interpreter::empty:

     entry_point = ((InterpreterGenerator*) this)->generate_empty_entry();

     break;

   case Interpreter::accessor:

     entry_point = ((InterpreterGenerator*) this)->generate_accessor_entry();

     break;

   case Interpreter::abstract:

     entry_point = ((InterpreterGenerator*) this)->generate_abstract_entry();

     break;

   case Interpreter::method_handle:

     entry_point = ((InterpreterGenerator*) this)->generate_method_handle_entry();

     break;

   case Interpreter::java_lang_math_sin:

   case Interpreter::java_lang_math_cos:

   case Interpreter::java_lang_math_tan:

   case Interpreter::java_lang_math_abs:

   case Interpreter::java_lang_math_log:

   case Interpreter::java_lang_math_log10:

   case Interpreter::java_lang_math_sqrt:

     entry_point = ((InterpreterGenerator*) this)->generate_math_entry(kind);

     break;

   case Interpreter::java_lang_ref_reference_get:

     entry_point = ((InterpreterGenerator*)this)->generate_Reference_get_entry();

     break;

   default:

     ShouldNotReachHere();

   }

   if (entry_point == NULL)

     entry_point = ((InterpreterGenerator*) this)->generate_normal_entry(false);

   return entry_point;

 }

 InterpreterGenerator::InterpreterGenerator(StubQueue* code)

  : CppInterpreterGenerator(code) {

    generate_all();

 }

 // Deoptimization helpers

 InterpreterFrame *InterpreterFrame::build(int size, TRAPS) {

   ZeroStack *stack = ((JavaThread *) THREAD)->zero_stack();

   int size_in_words = size >> LogBytesPerWord;

   assert(size_in_words * wordSize == size, "unaligned");

   assert(size_in_words >= header_words, "too small");

   stack->overflow_check(size_in_words, CHECK_NULL);

   stack->push(0); // next_frame, filled in later

   intptr_t *fp = stack->sp();

   assert(fp - stack->sp() == next_frame_off, "should be");

   stack->push(INTERPRETER_FRAME);

   assert(fp - stack->sp() == frame_type_off, "should be");

   interpreterState istate =

     (interpreterState) stack->alloc(sizeof(BytecodeInterpreter));

   assert(fp - stack->sp() == istate_off, "should be");

   istate->set_self_link(NULL); // mark invalid

   stack->alloc((size_in_words - header_words) * wordSize);

   return (InterpreterFrame *) fp;

 }

 int AbstractInterpreter::layout_activation(methodOop method,

                                            int       tempcount,

                                            int       popframe_extra_args,

                                            int       moncount,

                                            int       caller_actual_parameters,

                                            int       callee_param_count,

                                            int       callee_locals,

                                            frame*    caller,

                                            frame*    interpreter_frame,

                                            bool      is_top_frame) {

   assert(popframe_extra_args == 0, "what to do?");

   assert(!is_top_frame || (!callee_locals && !callee_param_count),

          "top frame should have no caller");

   // This code must exactly match what InterpreterFrame::build

   // does (the full InterpreterFrame::build, that is, not the

   // one that creates empty frames for the deoptimizer).

   //

   // If interpreter_frame is not NULL then it will be filled in.

   // It's size is determined by a previous call to this method,

   // so it should be correct.

   //

   // Note that tempcount is the current size of the expression

   // stack.  For top most frames we will allocate a full sized

   // expression stack and not the trimmed version that non-top

   // frames have.

   int header_words        = InterpreterFrame::header_words;

   int monitor_words       = moncount * frame::interpreter_frame_monitor_size();

   int stack_words         = is_top_frame ? method->max_stack() : tempcount;

   int callee_extra_locals = callee_locals - callee_param_count;

   if (interpreter_frame) {

     intptr_t *locals        = interpreter_frame->fp() + method->max_locals();

     interpreterState istate = interpreter_frame->get_interpreterState();

     intptr_t *monitor_base  = (intptr_t*) istate;

     intptr_t *stack_base    = monitor_base - monitor_words;

     intptr_t *stack         = stack_base - tempcount - 1;

     BytecodeInterpreter::layout_interpreterState(istate,

                                                  caller,

                                                  NULL,

                                                  method,

                                                  locals,

                                                  stack,

                                                  stack_base,

                                                  monitor_base,

                                                  NULL,

                                                  is_top_frame);

   }

   return header_words + monitor_words + stack_words + callee_extra_locals;

 }

 void BytecodeInterpreter::layout_interpreterState(interpreterState istate,

                                                   frame*    caller,

                                                   frame*    current,

                                                   methodOop method,

                                                   intptr_t* locals,

                                                   intptr_t* stack,

                                                   intptr_t* stack_base,

                                                   intptr_t* monitor_base,

                                                   intptr_t* frame_bottom,

                                                   bool      is_top_frame) {

   istate->set_locals(locals);

   istate->set_method(method);

   istate->set_self_link(istate);

   istate->set_prev_link(NULL);

   // thread will be set by a hacky repurposing of frame::patch_pc()

   // bcp will be set by vframeArrayElement::unpack_on_stack()

   istate->set_constants(method->constants()->cache());

   istate->set_msg(BytecodeInterpreter::method_resume);

   istate->set_bcp_advance(0);

   istate->set_oop_temp(NULL);

   istate->set_mdx(NULL);

   if (caller->is_interpreted_frame()) {

     interpreterState prev = caller->get_interpreterState();

     prev->set_callee(method);

     if (*prev->bcp() == Bytecodes::_invokeinterface)

       prev->set_bcp_advance(5);

     else

       prev->set_bcp_advance(3);

   }

   istate->set_callee(NULL);

   istate->set_monitor_base((BasicObjectLock *) monitor_base);

   istate->set_stack_base(stack_base);

   istate->set_stack(stack);

   istate->set_stack_limit(stack_base - method->max_stack() - 1);

 }

 address CppInterpreter::return_entry(TosState state, int length) {

   ShouldNotCallThis();

 }

 address CppInterpreter::deopt_entry(TosState state, int length) {

   return NULL;

 }

 // Helper for (runtime) stack overflow checks

 int AbstractInterpreter::size_top_interpreter_activation(methodOop method) {

   return 0;

 }

 // Helper for figuring out if frames are interpreter frames

 bool CppInterpreter::contains(address pc) {

 #ifdef PRODUCT

   ShouldNotCallThis();

 #else

   return false; // make frame::print_value_on work

 #endif // !PRODUCT

 }

 // Result handlers and convertors

 address CppInterpreterGenerator::generate_result_handler_for(

     BasicType type) {

   assembler()->advance(1);

   return ShouldNotCallThisStub();

 }

 address CppInterpreterGenerator::generate_tosca_to_stack_converter(

     BasicType type) {

   assembler()->advance(1);

   return ShouldNotCallThisStub();

 }

 address CppInterpreterGenerator::generate_stack_to_stack_converter(

     BasicType type) {

   assembler()->advance(1);

   return ShouldNotCallThisStub();

 }

 address CppInterpreterGenerator::generate_stack_to_native_abi_converter(

     BasicType type) {

   assembler()->advance(1);

   return ShouldNotCallThisStub();

 }

 #endif // CC_INTERP