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 /*

  * Copyright (c) 2007, 2016, 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

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  */

 #include "precompiled.hpp"

 #include "asm/macroAssembler.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/methodData.hpp"

 #include "oops/method.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 "utilities/debug.hpp"

 #include "utilities/macros.hpp"

 #ifdef SHARK

 #include "shark/shark_globals.hpp"

 #endif

 #ifdef CC_INTERP

 // Routine exists to make tracebacks look decent in debugger

 // while we are recursed in the frame manager/c++ interpreter.

 // We could use an address in the frame manager but having

 // frames look natural in the debugger is a plus.

 extern "C" void RecursiveInterpreterActivation(interpreterState istate )

 {

   //

   ShouldNotReachHere();

 }

 #define __ _masm->

 #define STATE(field_name) (Address(state, byte_offset_of(BytecodeInterpreter, field_name)))

 Label fast_accessor_slow_entry_path;  // fast accessor methods need to be able to jmp to unsynchronized

                                       // c++ interpreter entry point this holds that entry point label.

 // default registers for state and sender_sp

 // state and sender_sp are the same on 32bit because we have no choice.

 // state could be rsi on 64bit but it is an arg reg and not callee save

 // so r13 is better choice.

 const Register state = NOT_LP64(rsi) LP64_ONLY(r13);

 const Register sender_sp_on_entry = NOT_LP64(rsi) LP64_ONLY(r13);

 // NEEDED for JVMTI?

 // address AbstractInterpreter::_remove_activation_preserving_args_entry;

 static address unctrap_frame_manager_entry  = NULL;

 static address deopt_frame_manager_return_atos  = NULL;

 static address deopt_frame_manager_return_btos  = NULL;

 static address deopt_frame_manager_return_itos  = NULL;

 static address deopt_frame_manager_return_ltos  = NULL;

 static address deopt_frame_manager_return_ftos  = NULL;

 static address deopt_frame_manager_return_dtos  = NULL;

 static address deopt_frame_manager_return_vtos  = NULL;

 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_VOID   : i = 5; break;

     case T_FLOAT  : i = 8; break;

     case T_LONG   : i = 9; break;

     case T_DOUBLE : i = 6; break;

     case T_OBJECT : // fall through

     case T_ARRAY  : i = 7; break;

     default       : ShouldNotReachHere();

   }

   assert(0 <= i && i < AbstractInterpreter::number_of_result_handlers, "index out of bounds");

   return i;

 }

 // Is this pc anywhere within code owned by the interpreter?

 // This only works for pc that might possibly be exposed to frame

 // walkers. It clearly misses all of the actual c++ interpreter

 // implementation

 bool CppInterpreter::contains(address pc)            {

     return (_code->contains(pc) ||

             pc == CAST_FROM_FN_PTR(address, RecursiveInterpreterActivation));

 }

 address CppInterpreterGenerator::generate_result_handler_for(BasicType type) {

   address entry = __ pc();

   switch (type) {

     case T_BOOLEAN: __ c2bool(rax);            break;

     case T_CHAR   : __ andl(rax, 0xFFFF);      break;

     case T_BYTE   : __ sign_extend_byte (rax); break;

     case T_SHORT  : __ sign_extend_short(rax); break;

     case T_VOID   : // fall thru

     case T_LONG   : // fall thru

     case T_INT    : /* nothing to do */        break;

     case T_DOUBLE :

     case T_FLOAT  :

       {

         const Register t = InterpreterRuntime::SignatureHandlerGenerator::temp();

         __ pop(t);                            // remove return address first

         // Must return a result for interpreter or compiler. In SSE

         // mode, results are returned in xmm0 and the FPU stack must

         // be empty.

         if (type == T_FLOAT && UseSSE >= 1) {

 #ifndef _LP64

           // Load ST0

           __ fld_d(Address(rsp, 0));

           // Store as float and empty fpu stack

           __ fstp_s(Address(rsp, 0));

 #endif // !_LP64

           // and reload

           __ movflt(xmm0, Address(rsp, 0));

         } else if (type == T_DOUBLE && UseSSE >= 2 ) {

           __ movdbl(xmm0, Address(rsp, 0));

         } else {

           // restore ST0

           __ fld_d(Address(rsp, 0));

         }

         // and pop the temp

         __ addptr(rsp, 2 * wordSize);

         __ push(t);                            // restore return address

       }

       break;

     case T_OBJECT :

       // retrieve result from frame

       __ movptr(rax, STATE(_oop_temp));

       // and verify it

       __ verify_oop(rax);

       break;

     default       : ShouldNotReachHere();

   }

   __ ret(0);                                   // return from result handler

   return entry;

 }

 // tosca based result to c++ interpreter stack based result.

 // Result goes to top of native stack.

 #undef EXTEND  // SHOULD NOT BE NEEDED

 address CppInterpreterGenerator::generate_tosca_to_stack_converter(BasicType type) {

   // A result is in the tosca (abi result) from either a native method call or compiled

   // code. Place this result on the java expression stack so C++ interpreter can use it.

   address entry = __ pc();

   const Register t = InterpreterRuntime::SignatureHandlerGenerator::temp();

   __ pop(t);                            // remove return address first

   switch (type) {

     case T_VOID:

        break;

     case T_BOOLEAN:

 #ifdef EXTEND

       __ c2bool(rax);

 #endif

       __ push(rax);

       break;

     case T_CHAR   :

 #ifdef EXTEND

       __ andl(rax, 0xFFFF);

 #endif

       __ push(rax);

       break;

     case T_BYTE   :

 #ifdef EXTEND

       __ sign_extend_byte (rax);

 #endif

       __ push(rax);

       break;

     case T_SHORT  :

 #ifdef EXTEND

       __ sign_extend_short(rax);

 #endif

       __ push(rax);

       break;

     case T_LONG    :

       __ push(rdx);                             // pushes useless junk on 64bit

       __ push(rax);

       break;

     case T_INT    :

       __ push(rax);

       break;

     case T_FLOAT  :

       // Result is in ST(0)/xmm0

       __ subptr(rsp, wordSize);

       if ( UseSSE < 1) {

         __ fstp_s(Address(rsp, 0));

       } else {

         __ movflt(Address(rsp, 0), xmm0);

       }

       break;

     case T_DOUBLE  :

       __ subptr(rsp, 2*wordSize);

       if ( UseSSE < 2 ) {

         __ fstp_d(Address(rsp, 0));

       } else {

         __ movdbl(Address(rsp, 0), xmm0);

       }

       break;

     case T_OBJECT :

       __ verify_oop(rax);                      // verify it

       __ push(rax);

       break;

     default       : ShouldNotReachHere();

   }

   __ jmp(t);                                   // return from result handler

   return entry;

 }

 address CppInterpreterGenerator::generate_stack_to_stack_converter(BasicType type) {

   // A result is in the java expression stack of the interpreted method that has just

   // returned. Place this result on the java expression stack of the caller.

   //

   // The current interpreter activation in rsi/r13 is for the method just returning its

   // result. So we know that the result of this method is on the top of the current

   // execution stack (which is pre-pushed) and will be return to the top of the caller

   // stack. The top of the callers stack is the bottom of the locals of the current

   // activation.

   // Because of the way activation are managed by the frame manager the value of rsp is

   // below both the stack top of the current activation and naturally the stack top

   // of the calling activation. This enable this routine to leave the return address

   // to the frame manager on the stack and do a vanilla return.

   //

   // On entry: rsi/r13 - interpreter state of activation returning a (potential) result

   // On Return: rsi/r13 - unchanged

   //            rax - new stack top for caller activation (i.e. activation in _prev_link)

   //

   // Can destroy rdx, rcx.

   //

   address entry = __ pc();

   const Register t = InterpreterRuntime::SignatureHandlerGenerator::temp();

   switch (type) {

     case T_VOID:

       __ movptr(rax, STATE(_locals));                                   // pop parameters get new stack value

       __ addptr(rax, wordSize);                                         // account for prepush before we return

       break;

     case T_FLOAT  :

     case T_BOOLEAN:

     case T_CHAR   :

     case T_BYTE   :

     case T_SHORT  :

     case T_INT    :

       // 1 word result

       __ movptr(rdx, STATE(_stack));

       __ movptr(rax, STATE(_locals));                                   // address for result

       __ movl(rdx, Address(rdx, wordSize));                             // get result

       __ movptr(Address(rax, 0), rdx);                                  // and store it

       break;

     case T_LONG    :

     case T_DOUBLE  :

       // return top two words on current expression stack to caller's expression stack

       // The caller's expression stack is adjacent to the current frame manager's intepretState

       // except we allocated one extra word for this intepretState so we won't overwrite it

       // when we return a two word result.

       __ movptr(rax, STATE(_locals));                                   // address for result

       __ movptr(rcx, STATE(_stack));

       __ subptr(rax, wordSize);                                         // need addition word besides locals[0]

       __ movptr(rdx, Address(rcx, 2*wordSize));                         // get result word (junk in 64bit)

       __ movptr(Address(rax, wordSize), rdx);                           // and store it

       __ movptr(rdx, Address(rcx, wordSize));                           // get result word

       __ movptr(Address(rax, 0), rdx);                                  // and store it

       break;

     case T_OBJECT :

       __ movptr(rdx, STATE(_stack));

       __ movptr(rax, STATE(_locals));                                   // address for result

       __ movptr(rdx, Address(rdx, wordSize));                           // get result

       __ verify_oop(rdx);                                               // verify it

       __ movptr(Address(rax, 0), rdx);                                  // and store it

       break;

     default       : ShouldNotReachHere();

   }

   __ ret(0);

   return entry;

 }

 address CppInterpreterGenerator::generate_stack_to_native_abi_converter(BasicType type) {

   // A result is in the java expression stack of the interpreted method that has just

   // returned. Place this result in the native abi that the caller expects.

   //

   // Similar to generate_stack_to_stack_converter above. Called at a similar time from the

   // frame manager execept in this situation the caller is native code (c1/c2/call_stub)

   // and so rather than return result onto caller's java expression stack we return the

   // result in the expected location based on the native abi.

   // On entry: rsi/r13 - interpreter state of activation returning a (potential) result

   // On Return: rsi/r13 - unchanged

   // Other registers changed [rax/rdx/ST(0) as needed for the result returned]

   address entry = __ pc();

   switch (type) {

     case T_VOID:

        break;

     case T_BOOLEAN:

     case T_CHAR   :

     case T_BYTE   :

     case T_SHORT  :

     case T_INT    :

       __ movptr(rdx, STATE(_stack));                                    // get top of stack

       __ movl(rax, Address(rdx, wordSize));                             // get result word 1

       break;

     case T_LONG    :

       __ movptr(rdx, STATE(_stack));                                    // get top of stack

       __ movptr(rax, Address(rdx, wordSize));                           // get result low word

       NOT_LP64(__ movl(rdx, Address(rdx, 2*wordSize));)                 // get result high word

       break;

     case T_FLOAT  :

       __ movptr(rdx, STATE(_stack));                                    // get top of stack

       if ( UseSSE >= 1) {

         __ movflt(xmm0, Address(rdx, wordSize));

       } else {

         __ fld_s(Address(rdx, wordSize));                               // pushd float result

       }

       break;

     case T_DOUBLE  :

       __ movptr(rdx, STATE(_stack));                                    // get top of stack

       if ( UseSSE > 1) {

         __ movdbl(xmm0, Address(rdx, wordSize));

       } else {

         __ fld_d(Address(rdx, wordSize));                               // push double result

       }

       break;

     case T_OBJECT :

       __ movptr(rdx, STATE(_stack));                                    // get top of stack

       __ movptr(rax, Address(rdx, wordSize));                           // get result word 1

       __ verify_oop(rax);                                               // verify it

       break;

     default       : ShouldNotReachHere();

   }

   __ ret(0);

   return entry;

 }

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

   // make it look good in the debugger

   return CAST_FROM_FN_PTR(address, RecursiveInterpreterActivation);

 }

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

   address ret = NULL;

   if (length != 0) {

     switch (state) {

       case atos: ret = deopt_frame_manager_return_atos; break;

       case btos: ret = deopt_frame_manager_return_btos; break;

       case ctos:

       case stos:

       case itos: ret = deopt_frame_manager_return_itos; break;

       case ltos: ret = deopt_frame_manager_return_ltos; break;

       case ftos: ret = deopt_frame_manager_return_ftos; break;

       case dtos: ret = deopt_frame_manager_return_dtos; break;

       case vtos: ret = deopt_frame_manager_return_vtos; break;

     }

   } else {

     ret = unctrap_frame_manager_entry;  // re-execute the bytecode ( e.g. uncommon trap)

   }

   assert(ret != NULL, "Not initialized");

   return ret;

 }

 // C++ Interpreter

 void CppInterpreterGenerator::generate_compute_interpreter_state(const Register state,

                                                                  const Register locals,

                                                                  const Register sender_sp,

                                                                  bool native) {

   // On entry the "locals" argument points to locals[0] (or where it would be in case no locals in

   // a static method). "state" contains any previous frame manager state which we must save a link

   // to in the newly generated state object. On return "state" is a pointer to the newly allocated

   // state object. We must allocate and initialize a new interpretState object and the method

   // expression stack. Because the returned result (if any) of the method will be placed on the caller's

   // expression stack and this will overlap with locals[0] (and locals[1] if double/long) we must

   // be sure to leave space on the caller's stack so that this result will not overwrite values when

   // locals[0] and locals[1] do not exist (and in fact are return address and saved rbp). So when

   // we are non-native we in essence ensure that locals[0-1] exist. We play an extra trick in

   // non-product builds and initialize this last local with the previous interpreterState as

   // this makes things look real nice in the debugger.

   // State on entry

   // Assumes locals == &locals[0]

   // Assumes state == any previous frame manager state (assuming call path from c++ interpreter)

   // Assumes rax = return address

   // rcx == senders_sp

   // rbx == method

   // Modifies rcx, rdx, rax

   // Returns:

   // state == address of new interpreterState

   // rsp == bottom of method's expression stack.

   const Address const_offset      (rbx, Method::const_offset());

   // On entry sp is the sender's sp. This includes the space for the arguments

   // that the sender pushed. If the sender pushed no args (a static) and the

   // caller returns a long then we need two words on the sender's stack which

   // are not present (although when we return a restore full size stack the

   // space will be present). If we didn't allocate two words here then when

   // we "push" the result of the caller's stack we would overwrite the return

   // address and the saved rbp. Not good. So simply allocate 2 words now

   // just to be safe. This is the "static long no_params() method" issue.

   // See Lo.java for a testcase.

   // We don't need this for native calls because they return result in

   // register and the stack is expanded in the caller before we store

   // the results on the stack.

   if (!native) {

 #ifdef PRODUCT

     __ subptr(rsp, 2*wordSize);

 #else /* PRODUCT */

     __ push((int32_t)NULL_WORD);

     __ push(state);                         // make it look like a real argument

 #endif /* PRODUCT */

   }

   // Now that we are assure of space for stack result, setup typical linkage

   __ push(rax);

   __ enter();

   __ mov(rax, state);                                  // save current state

   __ lea(rsp, Address(rsp, -(int)sizeof(BytecodeInterpreter)));

   __ mov(state, rsp);

   // rsi/r13 == state/locals rax == prevstate

   // initialize the "shadow" frame so that use since C++ interpreter not directly

   // recursive. Simpler to recurse but we can't trim expression stack as we call

   // new methods.

   __ movptr(STATE(_locals), locals);                    // state->_locals = locals()

   __ movptr(STATE(_self_link), state);                  // point to self

   __ movptr(STATE(_prev_link), rax);                    // state->_link = state on entry (NULL or previous state)

   __ movptr(STATE(_sender_sp), sender_sp);              // state->_sender_sp = sender_sp

 #ifdef _LP64

   __ movptr(STATE(_thread), r15_thread);                // state->_bcp = codes()

 #else

   __ get_thread(rax);                                   // get vm's javathread*

   __ movptr(STATE(_thread), rax);                       // state->_bcp = codes()

 #endif // _LP64

   __ movptr(rdx, Address(rbx, Method::const_offset())); // get constantMethodOop

   __ lea(rdx, Address(rdx, ConstMethod::codes_offset())); // get code base

   if (native) {

     __ movptr(STATE(_bcp), (int32_t)NULL_WORD);         // state->_bcp = NULL

   } else {

     __ movptr(STATE(_bcp), rdx);                        // state->_bcp = codes()

   }

   __ xorptr(rdx, rdx);

   __ movptr(STATE(_oop_temp), rdx);                     // state->_oop_temp = NULL (only really needed for native)

   __ movptr(STATE(_mdx), rdx);                          // state->_mdx = NULL

   __ movptr(rdx, Address(rbx, Method::const_offset()));

   __ movptr(rdx, Address(rdx, ConstMethod::constants_offset()));

   __ movptr(rdx, Address(rdx, ConstantPool::cache_offset_in_bytes()));

   __ movptr(STATE(_constants), rdx);                    // state->_constants = constants()

   __ movptr(STATE(_method), rbx);                       // state->_method = method()

   __ movl(STATE(_msg), (int32_t) BytecodeInterpreter::method_entry);   // state->_msg = initial method entry

   __ movptr(STATE(_result._to_call._callee), (int32_t) NULL_WORD); // state->_result._to_call._callee_callee = NULL

   __ movptr(STATE(_monitor_base), rsp);                 // set monitor block bottom (grows down) this would point to entry [0]

                                                         // entries run from -1..x where &monitor[x] ==

   {

     // Must not attempt to lock method until we enter interpreter as gc won't be able to find the

     // initial frame. However we allocate a free monitor so we don't have to shuffle the expression stack

     // immediately.

     // synchronize method

     const Address access_flags      (rbx, Method::access_flags_offset());

     const int entry_size            = frame::interpreter_frame_monitor_size() * wordSize;

     Label not_synced;

     __ movl(rax, access_flags);

     __ testl(rax, JVM_ACC_SYNCHRONIZED);

     __ jcc(Assembler::zero, not_synced);

     // Allocate initial monitor and pre initialize it

     // get synchronization object

     Label done;

     const int mirror_offset = in_bytes(Klass::java_mirror_offset());

     __ movl(rax, access_flags);

     __ testl(rax, JVM_ACC_STATIC);

     __ movptr(rax, Address(locals, 0));                   // get receiver (assume this is frequent case)

     __ jcc(Assembler::zero, done);

     __ movptr(rax, Address(rbx, Method::const_offset()));

     __ movptr(rax, Address(rax, ConstMethod::constants_offset()));

     __ movptr(rax, Address(rax, ConstantPool::pool_holder_offset_in_bytes()));

     __ movptr(rax, Address(rax, mirror_offset));

     __ bind(done);

     // add space for monitor & lock

     __ subptr(rsp, entry_size);                                           // add space for a monitor entry

     __ movptr(Address(rsp, BasicObjectLock::obj_offset_in_bytes()), rax); // store object

     __ bind(not_synced);

   }

   __ movptr(STATE(_stack_base), rsp);                                     // set expression stack base ( == &monitors[-count])

   if (native) {

     __ movptr(STATE(_stack), rsp);                                        // set current expression stack tos

     __ movptr(STATE(_stack_limit), rsp);

   } else {

     __ subptr(rsp, wordSize);                                             // pre-push stack

     __ movptr(STATE(_stack), rsp);                                        // set current expression stack tos

     // compute full expression stack limit

     __ movptr(rdx, Address(rbx, Method::const_offset()));

     __ load_unsigned_short(rdx, Address(rdx, ConstMethod::max_stack_offset())); // get size of expression stack in words

     __ negptr(rdx);                                                       // so we can subtract in next step

     // Allocate expression stack

     __ lea(rsp, Address(rsp, rdx, Address::times_ptr, -Method::extra_stack_words()));

     __ movptr(STATE(_stack_limit), rsp);

   }

 #ifdef _LP64

   // Make sure stack is properly aligned and sized for the abi

   __ subptr(rsp, frame::arg_reg_save_area_bytes); // windows

   __ andptr(rsp, -16); // must be 16 byte boundary (see amd64 ABI)

 #endif // _LP64

 }

 // Helpers for commoning out cases in the various type of method entries.

 //

 // increment invocation count & check for overflow

 //

 // Note: checking for negative value instead of overflow

 //       so we have a 'sticky' overflow test

 //

 // rbx,: method

 // rcx: invocation counter

 //

 void InterpreterGenerator::generate_counter_incr(Label* overflow, Label* profile_method, Label* profile_method_continue) {

   Label done;

   const Address invocation_counter(rax,

                 MethodCounters::invocation_counter_offset() +

                 InvocationCounter::counter_offset());

   const Address backedge_counter  (rax,

                 MethodCounter::backedge_counter_offset() +

                 InvocationCounter::counter_offset());

   __ get_method_counters(rbx, rax, done);

   if (ProfileInterpreter) {

     __ incrementl(Address(rax,

             MethodCounters::interpreter_invocation_counter_offset()));

   }

   // Update standard invocation counters

   __ movl(rcx, invocation_counter);

   __ increment(rcx, InvocationCounter::count_increment);

   __ movl(invocation_counter, rcx);             // save invocation count

   __ movl(rax, backedge_counter);               // load backedge counter

   __ andl(rax, InvocationCounter::count_mask_value);  // mask out the status bits

   __ addl(rcx, rax);                            // add both counters

   // profile_method is non-null only for interpreted method so

   // profile_method != NULL == !native_call

   // BytecodeInterpreter only calls for native so code is elided.

   __ cmp32(rcx,

            ExternalAddress((address)&InvocationCounter::InterpreterInvocationLimit));

   __ jcc(Assembler::aboveEqual, *overflow);

   __ bind(done);

 }

 void InterpreterGenerator::generate_counter_overflow(Label* do_continue) {

   // C++ interpreter on entry

   // rsi/r13 - new interpreter state pointer

   // rbp - interpreter frame pointer

   // rbx - method

   // On return (i.e. jump to entry_point) [ back to invocation of interpreter ]

   // rbx, - method

   // rcx - rcvr (assuming there is one)

   // top of stack return address of interpreter caller

   // rsp - sender_sp

   // C++ interpreter only

   // rsi/r13 - previous interpreter state pointer

   // InterpreterRuntime::frequency_counter_overflow takes one argument

   // indicating if the counter overflow occurs at a backwards branch (non-NULL bcp).

   // The call returns the address of the verified entry point for the method or NULL

   // if the compilation did not complete (either went background or bailed out).

   __ movptr(rax, (int32_t)false);

   __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::frequency_counter_overflow), rax);

   // for c++ interpreter can rsi really be munged?

   __ lea(state, Address(rbp, -(int)sizeof(BytecodeInterpreter)));                               // restore state

   __ movptr(rbx, Address(state, byte_offset_of(BytecodeInterpreter, _method)));            // restore method

   __ movptr(rdi, Address(state, byte_offset_of(BytecodeInterpreter, _locals)));            // get locals pointer

   __ jmp(*do_continue, relocInfo::none);

 }

 void InterpreterGenerator::generate_stack_overflow_check(void) {

   // see if we've got enough room on the stack for locals plus overhead.

   // the expression stack grows down incrementally, so the normal guard

   // page mechanism will work for that.

   //

   // Registers live on entry:

   //

   // Asm interpreter

   // rdx: number of additional locals this frame needs (what we must check)

   // rbx,: Method*

   // C++ Interpreter

   // rsi/r13: previous interpreter frame state object

   // rdi: &locals[0]

   // rcx: # of locals

   // rdx: number of additional locals this frame needs (what we must check)

   // rbx: Method*

   // destroyed on exit

   // rax,

   // NOTE:  since the additional locals are also always pushed (wasn't obvious in

   // generate_method_entry) so the guard should work for them too.

   //

   // monitor entry size: see picture of stack set (generate_method_entry) and frame_i486.hpp

   const int entry_size    = frame::interpreter_frame_monitor_size() * wordSize;

   // total overhead size: entry_size + (saved rbp, thru expr stack bottom).

   // be sure to change this if you add/subtract anything to/from the overhead area

   const int overhead_size = (int)sizeof(BytecodeInterpreter);

   const int page_size = os::vm_page_size();

   Label after_frame_check;

   // compute rsp as if this were going to be the last frame on

   // the stack before the red zone

   Label after_frame_check_pop;

   // save rsi == caller's bytecode ptr (c++ previous interp. state)

   // QQQ problem here?? rsi overload????

   __ push(state);

   const Register thread = LP64_ONLY(r15_thread) NOT_LP64(rsi);

   NOT_LP64(__ get_thread(thread));

   const Address stack_base(thread, Thread::stack_base_offset());

   const Address stack_size(thread, Thread::stack_size_offset());

   // locals + overhead, in bytes

   // Always give one monitor to allow us to start interp if sync method.

   // Any additional monitors need a check when moving the expression stack

   const int one_monitor = frame::interpreter_frame_monitor_size() * wordSize;

   __ movptr(rax, Address(rbx, Method::const_offset()));

   __ load_unsigned_short(rax, Address(rax, ConstMethod::max_stack_offset())); // get size of expression stack in words

   __ lea(rax, Address(noreg, rax, Interpreter::stackElementScale(), one_monitor+Method::extra_stack_words()));

   __ lea(rax, Address(rax, rdx, Interpreter::stackElementScale(), overhead_size));

 #ifdef ASSERT

   Label stack_base_okay, stack_size_okay;

   // verify that thread stack base is non-zero

   __ cmpptr(stack_base, (int32_t)0);

   __ jcc(Assembler::notEqual, stack_base_okay);

   __ stop("stack base is zero");

   __ bind(stack_base_okay);

   // verify that thread stack size is non-zero

   __ cmpptr(stack_size, (int32_t)0);

   __ jcc(Assembler::notEqual, stack_size_okay);

   __ stop("stack size is zero");

   __ bind(stack_size_okay);

 #endif

   // Add stack base to locals and subtract stack size

   __ addptr(rax, stack_base);

   __ subptr(rax, stack_size);

   // We should have a magic number here for the size of the c++ interpreter frame.

   // We can't actually tell this ahead of time. The debug version size is around 3k

   // product is 1k and fastdebug is 4k

   const int slop = 6 * K;

   // Use the maximum number of pages we might bang.

   const int max_pages = StackShadowPages > (StackRedPages+StackYellowPages) ? StackShadowPages :

                                                                               (StackRedPages+StackYellowPages);

   // Only need this if we are stack banging which is temporary while

   // we're debugging.

   __ addptr(rax, slop + 2*max_pages * page_size);

   // check against the current stack bottom

   __ cmpptr(rsp, rax);

   __ jcc(Assembler::above, after_frame_check_pop);

   __ pop(state);  //  get c++ prev state.

      // throw exception return address becomes throwing pc

   __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_StackOverflowError));

   // all done with frame size check

   __ bind(after_frame_check_pop);

   __ pop(state);

   __ bind(after_frame_check);

 }

 // Find preallocated  monitor and lock method (C++ interpreter)

 // rbx - Method*

 //

 void InterpreterGenerator::lock_method(void) {

   // assumes state == rsi/r13 == pointer to current interpreterState

   // minimally destroys rax, rdx|c_rarg1, rdi

   //

   // synchronize method

   const int entry_size            = frame::interpreter_frame_monitor_size() * wordSize;

   const Address access_flags      (rbx, Method::access_flags_offset());

   const Register monitor  = NOT_LP64(rdx) LP64_ONLY(c_rarg1);

   // find initial monitor i.e. monitors[-1]

   __ movptr(monitor, STATE(_monitor_base));                                   // get monitor bottom limit

   __ subptr(monitor, entry_size);                                             // point to initial monitor

 #ifdef ASSERT

   { Label L;

     __ movl(rax, access_flags);

     __ testl(rax, JVM_ACC_SYNCHRONIZED);

     __ jcc(Assembler::notZero, L);

     __ stop("method doesn't need synchronization");

     __ bind(L);

   }

 #endif // ASSERT

   // get synchronization object

   { Label done;

     const int mirror_offset = in_bytes(Klass::java_mirror_offset());

     __ movl(rax, access_flags);

     __ movptr(rdi, STATE(_locals));                                     // prepare to get receiver (assume common case)

     __ testl(rax, JVM_ACC_STATIC);

     __ movptr(rax, Address(rdi, 0));                                    // get receiver (assume this is frequent case)

     __ jcc(Assembler::zero, done);

     __ movptr(rax, Address(rbx, Method::const_offset()));

     __ movptr(rax, Address(rax, ConstMethod::constants_offset()));

     __ movptr(rax, Address(rax, ConstantPool::pool_holder_offset_in_bytes()));

     __ movptr(rax, Address(rax, mirror_offset));

     __ bind(done);

   }

 #ifdef ASSERT

   { Label L;

     __ cmpptr(rax, Address(monitor, BasicObjectLock::obj_offset_in_bytes()));   // correct object?

     __ jcc(Assembler::equal, L);

     __ stop("wrong synchronization lobject");

     __ bind(L);

   }

 #endif // ASSERT

   // can destroy rax, rdx|c_rarg1, rcx, and (via call_VM) rdi!

   __ lock_object(monitor);

 }

 // Call an accessor method (assuming it is resolved, otherwise drop into vanilla (slow path) entry

 address InterpreterGenerator::generate_accessor_entry(void) {

   // rbx: Method*

   // rsi/r13: senderSP must preserved for slow path, set SP to it on fast path

   Label xreturn_path;

   // do fastpath for resolved accessor methods

   if (UseFastAccessorMethods) {

     address entry_point = __ pc();

     Label slow_path;

     // If we need a safepoint check, generate full interpreter entry.

     ExternalAddress state(SafepointSynchronize::address_of_state());

     __ cmp32(ExternalAddress(SafepointSynchronize::address_of_state()),

              SafepointSynchronize::_not_synchronized);

     __ jcc(Assembler::notEqual, slow_path);

     // ASM/C++ Interpreter

     // Code: _aload_0, _(i|a)getfield, _(i|a)return or any rewrites thereof; parameter size = 1

     // Note: We can only use this code if the getfield has been resolved

     //       and if we don't have a null-pointer exception => check for

     //       these conditions first and use slow path if necessary.

     // rbx,: method

     // rcx: receiver

     __ movptr(rax, Address(rsp, wordSize));

     // check if local 0 != NULL and read field

     __ testptr(rax, rax);

     __ jcc(Assembler::zero, slow_path);

     // read first instruction word and extract bytecode @ 1 and index @ 2

     __ movptr(rdx, Address(rbx, Method::const_offset()));

     __ movptr(rdi, Address(rdx, ConstMethod::constants_offset()));

     __ movl(rdx, Address(rdx, ConstMethod::codes_offset()));

     // Shift codes right to get the index on the right.

     // The bytecode fetched looks like <index><0xb4><0x2a>

     __ shrl(rdx, 2*BitsPerByte);

     __ shll(rdx, exact_log2(in_words(ConstantPoolCacheEntry::size())));

     __ movptr(rdi, Address(rdi, ConstantPool::cache_offset_in_bytes()));

     // rax,: local 0

     // rbx,: method

     // rcx: receiver - do not destroy since it is needed for slow path!

     // rcx: scratch

     // rdx: constant pool cache index

     // rdi: constant pool cache

     // rsi/r13: sender sp

     // check if getfield has been resolved and read constant pool cache entry

     // check the validity of the cache entry by testing whether _indices field

     // contains Bytecode::_getfield in b1 byte.

     assert(in_words(ConstantPoolCacheEntry::size()) == 4, "adjust shift below");

     __ movl(rcx,

             Address(rdi,

                     rdx,

                     Address::times_ptr, ConstantPoolCache::base_offset() + ConstantPoolCacheEntry::indices_offset()));

     __ shrl(rcx, 2*BitsPerByte);

     __ andl(rcx, 0xFF);

     __ cmpl(rcx, Bytecodes::_getfield);

     __ jcc(Assembler::notEqual, slow_path);

     // Note: constant pool entry is not valid before bytecode is resolved

     __ movptr(rcx,

             Address(rdi,

                     rdx,

                     Address::times_ptr, ConstantPoolCache::base_offset() + ConstantPoolCacheEntry::f2_offset()));

     __ movl(rdx,

             Address(rdi,

                     rdx,

                     Address::times_ptr, ConstantPoolCache::base_offset() + ConstantPoolCacheEntry::flags_offset()));

     Label notByte, notBool, notShort, notChar;

     const Address field_address (rax, rcx, Address::times_1);

     // Need to differentiate between igetfield, agetfield, bgetfield etc.

     // because they are different sizes.

     // Use the type from the constant pool cache

     __ shrl(rdx, ConstantPoolCacheEntry::tos_state_shift);

     // Make sure we don't need to mask rdx after the above shift

     ConstantPoolCacheEntry::verify_tos_state_shift();

 #ifdef _LP64

     Label notObj;

     __ cmpl(rdx, atos);

     __ jcc(Assembler::notEqual, notObj);

     // atos

     __ movptr(rax, field_address);

     __ jmp(xreturn_path);

     __ bind(notObj);

 #endif // _LP64

     __ cmpl(rdx, ztos);

     __ jcc(Assembler::notEqual, notBool);

     __ load_signed_byte(rax, field_address);

     __ jmp(xreturn_path);

     __ cmpl(rdx, btos);

     __ jcc(Assembler::notEqual, notByte);

     __ load_signed_byte(rax, field_address);

     __ jmp(xreturn_path);

     __ bind(notByte);

     __ cmpl(rdx, stos);

     __ jcc(Assembler::notEqual, notShort);

     __ load_signed_short(rax, field_address);

     __ jmp(xreturn_path);

     __ bind(notShort);

     __ cmpl(rdx, ctos);

     __ jcc(Assembler::notEqual, notChar);

     __ load_unsigned_short(rax, field_address);

     __ jmp(xreturn_path);

     __ bind(notChar);

 #ifdef ASSERT

     Label okay;

 #ifndef _LP64

     __ cmpl(rdx, atos);

     __ jcc(Assembler::equal, okay);

 #endif // _LP64

     __ cmpl(rdx, itos);

     __ jcc(Assembler::equal, okay);

     __ stop("what type is this?");

     __ bind(okay);

 #endif // ASSERT

     // All the rest are a 32 bit wordsize

     __ movl(rax, field_address);

     __ bind(xreturn_path);

     // _ireturn/_areturn

     __ pop(rdi);                               // get return address

     __ mov(rsp, sender_sp_on_entry);           // set sp to sender sp

     __ jmp(rdi);

     // generate a vanilla interpreter entry as the slow path

     __ bind(slow_path);

     // We will enter c++ interpreter looking like it was

     // called by the call_stub this will cause it to return

     // a tosca result to the invoker which might have been

     // the c++ interpreter itself.

     __ jmp(fast_accessor_slow_entry_path);

     return entry_point;

   } else {

     return NULL;

   }

 }

 address InterpreterGenerator::generate_Reference_get_entry(void) {

 #if INCLUDE_ALL_GCS

   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 // INCLUDE_ALL_GCS

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

   // Reference.get is an accessor

   return generate_accessor_entry();

 }

 //

 // C++ Interpreter stub for calling a native method.

 // This sets up a somewhat different looking stack for calling the native method

 // than the typical interpreter frame setup but still has the pointer to

 // an interpreter state.

 //

 address InterpreterGenerator::generate_native_entry(bool synchronized) {

   // determine code generation flags

   bool inc_counter  = UseCompiler || CountCompiledCalls;

   // rbx: Method*

   // rcx: receiver (unused)

   // rsi/r13: previous interpreter state (if called from C++ interpreter) must preserve

   //      in any case. If called via c1/c2/call_stub rsi/r13 is junk (to use) but harmless

   //      to save/restore.

   address entry_point = __ pc();

   const Address constMethod       (rbx, Method::const_offset());

   const Address access_flags      (rbx, Method::access_flags_offset());

   const Address size_of_parameters(rcx, ConstMethod::size_of_parameters_offset());

   // rsi/r13 == state/locals rdi == prevstate

   const Register locals = rdi;

   // get parameter size (always needed)

   __ movptr(rcx, constMethod);

   __ load_unsigned_short(rcx, size_of_parameters);

   // rbx: Method*

   // rcx: size of parameters

   __ pop(rax);                                       // get return address

   // for natives the size of locals is zero

   // compute beginning of parameters /locals

   __ lea(locals, Address(rsp, rcx, Address::times_ptr, -wordSize));

   // initialize fixed part of activation frame

   // Assumes rax = return address

   // allocate and initialize new interpreterState and method expression stack

   // IN(locals) ->  locals

   // IN(state) -> previous frame manager state (NULL from stub/c1/c2)

   // destroys rax, rcx, rdx

   // OUT (state) -> new interpreterState

   // OUT(rsp) -> bottom of methods expression stack

   // save sender_sp

   __ mov(rcx, sender_sp_on_entry);

   // start with NULL previous state

   __ movptr(state, (int32_t)NULL_WORD);

   generate_compute_interpreter_state(state, locals, rcx, true);

 #ifdef ASSERT

   { Label L;

     __ movptr(rax, STATE(_stack_base));

 #ifdef _LP64

     // duplicate the alignment rsp got after setting stack_base

     __ subptr(rax, frame::arg_reg_save_area_bytes); // windows

     __ andptr(rax, -16); // must be 16 byte boundary (see amd64 ABI)

 #endif // _LP64

     __ cmpptr(rax, rsp);

     __ jcc(Assembler::equal, L);

     __ stop("broken stack frame setup in interpreter");

     __ bind(L);

   }

 #endif

   const Register unlock_thread = LP64_ONLY(r15_thread) NOT_LP64(rax);

   NOT_LP64(__ movptr(unlock_thread, STATE(_thread));) // get thread

   // Since at this point in the method invocation the exception handler

   // would try to exit the monitor of synchronized methods which hasn't

   // been entered yet, we set the thread local variable

   // _do_not_unlock_if_synchronized to true. The remove_activation will

   // check this flag.

   const Address do_not_unlock_if_synchronized(unlock_thread,

         in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()));

   __ movbool(do_not_unlock_if_synchronized, true);

   // make sure method is native & not abstract

 #ifdef ASSERT

   __ movl(rax, access_flags);

   {

     Label L;

     __ testl(rax, JVM_ACC_NATIVE);

     __ jcc(Assembler::notZero, L);

     __ stop("tried to execute non-native method as native");

     __ bind(L);

   }

   { Label L;

     __ testl(rax, JVM_ACC_ABSTRACT);

     __ jcc(Assembler::zero, L);

     __ stop("tried to execute abstract method in interpreter");

     __ bind(L);

   }

 #endif

   // increment invocation count & check for overflow

   Label invocation_counter_overflow;

   if (inc_counter) {

     generate_counter_incr(&invocation_counter_overflow, NULL, NULL);

   }

   Label continue_after_compile;

   __ bind(continue_after_compile);

   bang_stack_shadow_pages(true);

   // reset the _do_not_unlock_if_synchronized flag

   NOT_LP64(__ movl(rax, STATE(_thread));)                       // get thread

   __ movbool(do_not_unlock_if_synchronized, false);

   // check for synchronized native methods

   //

   // Note: This must happen *after* invocation counter check, since

   //       when overflow happens, the method should not be locked.

   if (synchronized) {

     // potentially kills rax, rcx, rdx, rdi

     lock_method();

   } else {

     // no synchronization necessary

 #ifdef ASSERT

       { Label L;

         __ movl(rax, access_flags);

         __ testl(rax, JVM_ACC_SYNCHRONIZED);

         __ jcc(Assembler::zero, L);

         __ stop("method needs synchronization");

         __ bind(L);

       }

 #endif

   }

   // start execution

   // jvmti support

   __ notify_method_entry();

   // work registers

   const Register method = rbx;

   const Register thread = LP64_ONLY(r15_thread) NOT_LP64(rdi);

   const Register t      = InterpreterRuntime::SignatureHandlerGenerator::temp();    // rcx|rscratch1

   const Address constMethod       (method, Method::const_offset());

   const Address size_of_parameters(t, ConstMethod::size_of_parameters_offset());

   // allocate space for parameters

   __ movptr(method, STATE(_method));

   __ verify_method_ptr(method);

   __ movptr(t, constMethod);

   __ load_unsigned_short(t, size_of_parameters);

   __ shll(t, 2);

 #ifdef _LP64

   __ subptr(rsp, t);

   __ subptr(rsp, frame::arg_reg_save_area_bytes); // windows

   __ andptr(rsp, -16); // must be 16 byte boundary (see amd64 ABI)

 #else

   __ addptr(t, 2*wordSize);     // allocate two more slots for JNIEnv and possible mirror

   __ subptr(rsp, t);

   __ andptr(rsp, -(StackAlignmentInBytes)); // gcc needs 16 byte aligned stacks to do XMM intrinsics

 #endif // _LP64

   // get signature handler

     Label pending_exception_present;

   { Label L;

     __ movptr(t, Address(method, Method::signature_handler_offset()));

     __ testptr(t, t);

     __ jcc(Assembler::notZero, L);

     __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::prepare_native_call), method, false);

     __ movptr(method, STATE(_method));

     __ cmpptr(Address(thread, Thread::pending_exception_offset()), (int32_t)NULL_WORD);

     __ jcc(Assembler::notEqual, pending_exception_present);

     __ verify_method_ptr(method);

     __ movptr(t, Address(method, Method::signature_handler_offset()));

     __ bind(L);

   }

 #ifdef ASSERT

   {

     Label L;

     __ push(t);

     __ get_thread(t);                                   // get vm's javathread*

     __ cmpptr(t, STATE(_thread));

     __ jcc(Assembler::equal, L);

     __ int3();

     __ bind(L);

     __ pop(t);

   }

 #endif //

   const Register from_ptr = InterpreterRuntime::SignatureHandlerGenerator::from();

   // call signature handler

   assert(InterpreterRuntime::SignatureHandlerGenerator::to  () == rsp, "adjust this code");

   // The generated handlers do not touch RBX (the method oop).

   // However, large signatures cannot be cached and are generated

   // each time here.  The slow-path generator will blow RBX

   // sometime, so we must reload it after the call.

   __ movptr(from_ptr, STATE(_locals));  // get the from pointer

   __ call(t);

   __ movptr(method, STATE(_method));

   __ verify_method_ptr(method);

   // result handler is in rax

   // set result handler

   __ movptr(STATE(_result_handler), rax);

   // get native function entry point

   { Label L;

     __ movptr(rax, Address(method, Method::native_function_offset()));

     __ testptr(rax, rax);

     __ jcc(Assembler::notZero, L);

     __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::prepare_native_call), method);

     __ movptr(method, STATE(_method));

     __ verify_method_ptr(method);

     __ movptr(rax, Address(method, Method::native_function_offset()));

     __ bind(L);

   }

   // pass mirror handle if static call

   { Label L;

     const int mirror_offset = in_bytes(Klass::java_mirror_offset());

     __ movl(t, Address(method, Method::access_flags_offset()));

     __ testl(t, JVM_ACC_STATIC);

     __ jcc(Assembler::zero, L);

     // get mirror

     __ movptr(t, Address(method, Method:: const_offset()));

     __ movptr(t, Address(t, ConstMethod::constants_offset()));

     __ movptr(t, Address(t, ConstantPool::pool_holder_offset_in_bytes()));

     __ movptr(t, Address(t, mirror_offset));

     // copy mirror into activation object

     __ movptr(STATE(_oop_temp), t);

     // pass handle to mirror

 #ifdef _LP64

     __ lea(c_rarg1, STATE(_oop_temp));

 #else

     __ lea(t, STATE(_oop_temp));

     __ movptr(Address(rsp, wordSize), t);

 #endif // _LP64

     __ bind(L);

   }

 #ifdef ASSERT

   {

     Label L;

     __ push(t);

     __ get_thread(t);                                   // get vm's javathread*

     __ cmpptr(t, STATE(_thread));

     __ jcc(Assembler::equal, L);

     __ int3();

     __ bind(L);

     __ pop(t);

   }

 #endif //

   // pass JNIEnv

 #ifdef _LP64

   __ lea(c_rarg0, Address(thread, JavaThread::jni_environment_offset()));

 #else

   __ movptr(thread, STATE(_thread));          // get thread

   __ lea(t, Address(thread, JavaThread::jni_environment_offset()));

   __ movptr(Address(rsp, 0), t);

 #endif // _LP64

 #ifdef ASSERT

   {

     Label L;

     __ push(t);

     __ get_thread(t);                                   // get vm's javathread*

     __ cmpptr(t, STATE(_thread));

     __ jcc(Assembler::equal, L);

     __ int3();

     __ bind(L);

     __ pop(t);

   }

 #endif //

 #ifdef ASSERT

   { Label L;

     __ movl(t, Address(thread, JavaThread::thread_state_offset()));

     __ cmpl(t, _thread_in_Java);

     __ jcc(Assembler::equal, L);

     __ stop("Wrong thread state in native stub");

     __ bind(L);

   }

 #endif

   // Change state to native (we save the return address in the thread, since it might not

   // be pushed on the stack when we do a a stack traversal). It is enough that the pc()

   // points into the right code segment. It does not have to be the correct return pc.

   __ set_last_Java_frame(thread, noreg, rbp, __ pc());

   __ movl(Address(thread, JavaThread::thread_state_offset()), _thread_in_native);

   __ call(rax);

   // result potentially in rdx:rax or ST0

   __ movptr(method, STATE(_method));

   NOT_LP64(__ movptr(thread, STATE(_thread));)                  // get thread

   // The potential result is in ST(0) & rdx:rax

   // With C++ interpreter we leave any possible result in ST(0) until we are in result handler and then

   // we do the appropriate stuff for returning the result. rdx:rax must always be saved because just about

   // anything we do here will destroy it, st(0) is only saved if we re-enter the vm where it would

   // be destroyed.

   // It is safe to do these pushes because state is _thread_in_native and return address will be found

   // via _last_native_pc and not via _last_jave_sp

     // Must save the value of ST(0)/xmm0 since it could be destroyed before we get to result handler

     { Label Lpush, Lskip;

       ExternalAddress float_handler(AbstractInterpreter::result_handler(T_FLOAT));

       ExternalAddress double_handler(AbstractInterpreter::result_handler(T_DOUBLE));

       __ cmpptr(STATE(_result_handler), float_handler.addr());

       __ jcc(Assembler::equal, Lpush);

       __ cmpptr(STATE(_result_handler), double_handler.addr());

       __ jcc(Assembler::notEqual, Lskip);

       __ bind(Lpush);

       __ subptr(rsp, 2*wordSize);

       if ( UseSSE < 2 ) {

         __ fstp_d(Address(rsp, 0));

       } else {

         __ movdbl(Address(rsp, 0), xmm0);

       }

       __ bind(Lskip);

     }

   // save rax:rdx for potential use by result handler.

   __ push(rax);

 #ifndef _LP64

   __ push(rdx);

 #endif // _LP64

   // Verify or restore cpu control state after JNI call

   __ restore_cpu_control_state_after_jni();

   // change thread state

   __ movl(Address(thread, JavaThread::thread_state_offset()), _thread_in_native_trans);

   if(os::is_MP()) {

     // Write serialization page so VM thread can do a pseudo remote membar.

     // We use the current thread pointer to calculate a thread specific

     // offset to write to within the page. This minimizes bus traffic

     // due to cache line collision.

     __ serialize_memory(thread, rcx);

   }

   // check for safepoint operation in progress and/or pending suspend requests

   { Label Continue;

     __ cmp32(ExternalAddress(SafepointSynchronize::address_of_state()),

              SafepointSynchronize::_not_synchronized);

     // threads running native code and they are expected to self-suspend

     // when leaving the _thread_in_native state. We need to check for

     // pending suspend requests here.

     Label L;

     __ jcc(Assembler::notEqual, L);

     __ cmpl(Address(thread, JavaThread::suspend_flags_offset()), 0);

     __ jcc(Assembler::equal, Continue);

     __ bind(L);

     // Don't use call_VM as it will see a possible pending exception and forward it

     // and never return here preventing us from clearing _last_native_pc down below.

     // Also can't use call_VM_leaf either as it will check to see if rsi & rdi are

     // preserved and correspond to the bcp/locals pointers.

     //

     ((MacroAssembler*)_masm)->call_VM_leaf(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans),

                           thread);

     __ increment(rsp, wordSize);

     __ movptr(method, STATE(_method));

     __ verify_method_ptr(method);

     __ movptr(thread, STATE(_thread));                       // get thread

     __ bind(Continue);

   }

   // change thread state

   __ movl(Address(thread, JavaThread::thread_state_offset()), _thread_in_Java);

   __ reset_last_Java_frame(thread, true, true);

   // reset handle block

   __ movptr(t, Address(thread, JavaThread::active_handles_offset()));

   __ movl(Address(t, JNIHandleBlock::top_offset_in_bytes()), (int32_t)NULL_WORD);

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

   { Label L;

     Label no_oop, store_result;

       ExternalAddress oop_handler(AbstractInterpreter::result_handler(T_OBJECT));

     __ cmpptr(STATE(_result_handler), oop_handler.addr());

     __ jcc(Assembler::notEqual, no_oop);

 #ifndef _LP64

     __ pop(rdx);

 #endif // _LP64

     __ pop(rax);

     __ testptr(rax, rax);

     __ jcc(Assembler::zero, store_result);

     // unbox

     __ movptr(rax, Address(rax, 0));

     __ bind(store_result);

     __ movptr(STATE(_oop_temp), rax);

     // keep stack depth as expected by pushing oop which will eventually be discarded

     __ push(rax);

 #ifndef _LP64

     __ push(rdx);

 #endif // _LP64

     __ bind(no_oop);

   }

   {

      Label no_reguard;

      __ cmpl(Address(thread, JavaThread::stack_guard_state_offset()), JavaThread::stack_guard_yellow_disabled);

      __ jcc(Assembler::notEqual, no_reguard);

      __ pusha();

      __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::reguard_yellow_pages)));

      __ popa();

      __ bind(no_reguard);

    }

   // QQQ Seems like for native methods we simply return and the caller will see the pending

   // exception and do the right thing. Certainly the interpreter will, don't know about

   // compiled methods.

   // Seems that the answer to above is no this is wrong. The old code would see the exception

   // and forward it before doing the unlocking and notifying jvmdi that method has exited.

   // This seems wrong need to investigate the spec.

   // handle exceptions (exception handling will handle unlocking!)

   { Label L;

     __ cmpptr(Address(thread, Thread::pending_exception_offset()), (int32_t)NULL_WORD);

     __ jcc(Assembler::zero, L);

     __ bind(pending_exception_present);

     // There are potential results on the stack (rax/rdx, ST(0)) we ignore these and simply

     // return and let caller deal with exception. This skips the unlocking here which

     // seems wrong but seems to be what asm interpreter did. Can't find this in the spec.

     // Note: must preverve method in rbx

     //

     // remove activation

     __ movptr(t, STATE(_sender_sp));

     __ leave();                                  // remove frame anchor

     __ pop(rdi);                                 // get return address

     __ movptr(state, STATE(_prev_link));         // get previous state for return

     __ mov(rsp, t);                              // set sp to sender sp

     __ push(rdi);                                // push throwing pc

     // The skips unlocking!! This seems to be what asm interpreter does but seems

     // very wrong. Not clear if this violates the spec.

     __ jump(RuntimeAddress(StubRoutines::forward_exception_entry()));

     __ bind(L);

   }

   // do unlocking if necessary

   { Label L;

     __ movl(t, Address(method, Method::access_flags_offset()));

     __ testl(t, JVM_ACC_SYNCHRONIZED);

     __ jcc(Assembler::zero, L);

     // the code below should be shared with interpreter macro assembler implementation

     { Label unlock;

     const Register monitor = NOT_LP64(rdx) LP64_ONLY(c_rarg1);

       // BasicObjectLock will be first in list, since this is a synchronized method. However, need

       // to check that the object has not been unlocked by an explicit monitorexit bytecode.

       __ movptr(monitor, STATE(_monitor_base));

       __ subptr(monitor, frame::interpreter_frame_monitor_size() * wordSize);  // address of initial monitor

       __ movptr(t, Address(monitor, BasicObjectLock::obj_offset_in_bytes()));

       __ testptr(t, t);

       __ jcc(Assembler::notZero, unlock);

       // Entry already unlocked, need to throw exception

       __ MacroAssembler::call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_illegal_monitor_state_exception));

       __ should_not_reach_here();

       __ bind(unlock);

       __ unlock_object(monitor);

       // unlock can blow rbx so restore it for path that needs it below

       __ movptr(method, STATE(_method));

     }

     __ bind(L);

   }

   // jvmti support

   // Note: This must happen _after_ handling/throwing any exceptions since

   //       the exception handler code notifies the runtime of method exits

   //       too. If this happens before, method entry/exit notifications are

   //       not properly paired (was bug - gri 11/22/99).

   __ notify_method_exit(vtos, InterpreterMacroAssembler::NotifyJVMTI);

   // restore potential result in rdx:rax, call result handler to restore potential result in ST0 & handle result

 #ifndef _LP64

   __ pop(rdx);

 #endif // _LP64

   __ pop(rax);

   __ movptr(t, STATE(_result_handler));       // get result handler

   __ call(t);                                 // call result handler to convert to tosca form

   // remove activation

   __ movptr(t, STATE(_sender_sp));

   __ leave();                                  // remove frame anchor

   __ pop(rdi);                                 // get return address

   __ movptr(state, STATE(_prev_link));         // get previous state for return (if c++ interpreter was caller)

   __ mov(rsp, t);                              // set sp to sender sp

   __ jmp(rdi);

   // invocation counter overflow

   if (inc_counter) {

     // Handle overflow of counter and compile method

     __ bind(invocation_counter_overflow);

     generate_counter_overflow(&continue_after_compile);

   }

   return entry_point;

 }

 // Generate entries that will put a result type index into rcx

 void CppInterpreterGenerator::generate_deopt_handling() {

   Label return_from_deopt_common;

   // Generate entries that will put a result type index into rcx

   // deopt needs to jump to here to enter the interpreter (return a result)

   deopt_frame_manager_return_atos  = __ pc();

   // rax is live here

   __ movl(rcx, AbstractInterpreter::BasicType_as_index(T_OBJECT));    // Result stub address array index

   __ jmp(return_from_deopt_common);

   // deopt needs to jump to here to enter the interpreter (return a result)

   deopt_frame_manager_return_btos  = __ pc();

   // rax is live here

   __ movl(rcx, AbstractInterpreter::BasicType_as_index(T_BOOLEAN));    // Result stub address array index

   __ jmp(return_from_deopt_common);

   // deopt needs to jump to here to enter the interpreter (return a result)

   deopt_frame_manager_return_itos  = __ pc();

   // rax is live here

   __ movl(rcx, AbstractInterpreter::BasicType_as_index(T_INT));    // Result stub address array index

   __ jmp(return_from_deopt_common);

   // deopt needs to jump to here to enter the interpreter (return a result)

   deopt_frame_manager_return_ltos  = __ pc();

   // rax,rdx are live here

   __ movl(rcx, AbstractInterpreter::BasicType_as_index(T_LONG));    // Result stub address array index

   __ jmp(return_from_deopt_common);

   // deopt needs to jump to here to enter the interpreter (return a result)

   deopt_frame_manager_return_ftos  = __ pc();

   // st(0) is live here

   __ movl(rcx, AbstractInterpreter::BasicType_as_index(T_FLOAT));    // Result stub address array index

   __ jmp(return_from_deopt_common);

   // deopt needs to jump to here to enter the interpreter (return a result)

   deopt_frame_manager_return_dtos  = __ pc();

   // st(0) is live here

   __ movl(rcx, AbstractInterpreter::BasicType_as_index(T_DOUBLE));    // Result stub address array index

   __ jmp(return_from_deopt_common);

   // deopt needs to jump to here to enter the interpreter (return a result)

   deopt_frame_manager_return_vtos  = __ pc();

   __ movl(rcx, AbstractInterpreter::BasicType_as_index(T_VOID));

   // Deopt return common

   // an index is present in rcx that lets us move any possible result being

   // return to the interpreter's stack

   //

   // Because we have a full sized interpreter frame on the youngest

   // activation the stack is pushed too deep to share the tosca to

   // stack converters directly. We shrink the stack to the desired

   // amount and then push result and then re-extend the stack.

   // We could have the code in size_activation layout a short

   // frame for the top activation but that would look different

   // than say sparc (which needs a full size activation because

   // the windows are in the way. Really it could be short? QQQ

   //

   __ bind(return_from_deopt_common);

   __ lea(state, Address(rbp, -(int)sizeof(BytecodeInterpreter)));

   // setup rsp so we can push the "result" as needed.

   __ movptr(rsp, STATE(_stack));                                   // trim stack (is prepushed)

   __ addptr(rsp, wordSize);                                        // undo prepush

   ExternalAddress tosca_to_stack((address)CppInterpreter::_tosca_to_stack);

   // Address index(noreg, rcx, Address::times_ptr);

   __ movptr(rcx, ArrayAddress(tosca_to_stack, Address(noreg, rcx, Address::times_ptr)));

   // __ movl(rcx, Address(noreg, rcx, Address::times_ptr, int(AbstractInterpreter::_tosca_to_stack)));

   __ call(rcx);                                                   // call result converter

   __ movl(STATE(_msg), (int)BytecodeInterpreter::deopt_resume);

   __ lea(rsp, Address(rsp, -wordSize));                            // prepush stack (result if any already present)

   __ movptr(STATE(_stack), rsp);                                   // inform interpreter of new stack depth (parameters removed,

                                                                    // result if any on stack already )

   __ movptr(rsp, STATE(_stack_limit));                             // restore expression stack to full depth

 }

 // Generate the code to handle a more_monitors message from the c++ interpreter

 void CppInterpreterGenerator::generate_more_monitors() {

   Label entry, loop;

   const int entry_size = frame::interpreter_frame_monitor_size() * wordSize;

   // 1. compute new pointers                     // rsp: old expression stack top

   __ movptr(rdx, STATE(_stack_base));            // rdx: old expression stack bottom

   __ subptr(rsp, entry_size);                    // move expression stack top limit

   __ subptr(STATE(_stack), entry_size);          // update interpreter stack top

   __ subptr(STATE(_stack_limit), entry_size);    // inform interpreter

   __ subptr(rdx, entry_size);                    // move expression stack bottom

   __ movptr(STATE(_stack_base), rdx);            // inform interpreter

   __ movptr(rcx, STATE(_stack));                 // set start value for copy loop

   __ jmp(entry);

   // 2. move expression stack contents

   __ bind(loop);

   __ movptr(rbx, Address(rcx, entry_size));      // load expression stack word from old location

   __ movptr(Address(rcx, 0), rbx);               // and store it at new location

   __ addptr(rcx, wordSize);                      // advance to next word

   __ bind(entry);

   __ cmpptr(rcx, rdx);                           // check if bottom reached

   __ jcc(Assembler::notEqual, loop);             // if not at bottom then copy next word

   // now zero the slot so we can find it.

   __ movptr(Address(rdx, BasicObjectLock::obj_offset_in_bytes()), (int32_t) NULL_WORD);

   __ movl(STATE(_msg), (int)BytecodeInterpreter::got_monitors);

 }

 // Initial entry to C++ interpreter from the call_stub.

 // This entry point is called the frame manager since it handles the generation

 // of interpreter activation frames via requests directly from the vm (via call_stub)

 // and via requests from the interpreter. The requests from the call_stub happen

 // directly thru the entry point. Requests from the interpreter happen via returning

 // from the interpreter and examining the message the interpreter has returned to

 // the frame manager. The frame manager can take the following requests:

 // NO_REQUEST - error, should never happen.

 // MORE_MONITORS - need a new monitor. Shuffle the expression stack on down and

 //                 allocate a new monitor.

 // CALL_METHOD - setup a new activation to call a new method. Very similar to what

 //               happens during entry during the entry via the call stub.

 // RETURN_FROM_METHOD - remove an activation. Return to interpreter or call stub.

 //

 // Arguments:

 //

 // rbx: Method*

 // rcx: receiver - unused (retrieved from stack as needed)

 // rsi/r13: previous frame manager state (NULL from the call_stub/c1/c2)

 //

 //

 // Stack layout at entry

 //

 // [ return address     ] <--- rsp

 // [ parameter n        ]

 //   ...

 // [ parameter 1        ]

 // [ expression stack   ]

 //

 //

 // We are free to blow any registers we like because the call_stub which brought us here

 // initially has preserved the callee save registers already.

 //

 //

 static address interpreter_frame_manager = NULL;

 address InterpreterGenerator::generate_normal_entry(bool synchronized) {

   // rbx: Method*

   // rsi/r13: sender sp

   // Because we redispatch "recursive" interpreter entries thru this same entry point

   // the "input" register usage is a little strange and not what you expect coming

   // from the call_stub. From the call stub rsi/rdi (current/previous) interpreter

   // state are NULL but on "recursive" dispatches they are what you'd expect.

   // rsi: current interpreter state (C++ interpreter) must preserve (null from call_stub/c1/c2)

   // A single frame manager is plenty as we don't specialize for synchronized. We could and

   // the code is pretty much ready. Would need to change the test below and for good measure

   // modify generate_interpreter_state to only do the (pre) sync stuff stuff for synchronized

   // routines. Not clear this is worth it yet.

   if (interpreter_frame_manager) return interpreter_frame_manager;

   address entry_point = __ pc();

   // Fast accessor methods share this entry point.

   // This works because frame manager is in the same codelet

   if (UseFastAccessorMethods && !synchronized) __ bind(fast_accessor_slow_entry_path);

   Label dispatch_entry_2;

   __ movptr(rcx, sender_sp_on_entry);

   __ movptr(state, (int32_t)NULL_WORD);                              // no current activation

   __ jmp(dispatch_entry_2);

   const Register locals  = rdi;

   Label re_dispatch;

   __ bind(re_dispatch);

   // save sender sp (doesn't include return address

   __ lea(rcx, Address(rsp, wordSize));

   __ bind(dispatch_entry_2);

   // save sender sp

   __ push(rcx);

   const Address constMethod       (rbx, Method::const_offset());

   const Address access_flags      (rbx, Method::access_flags_offset());

   const Address size_of_parameters(rdx, ConstMethod::size_of_parameters_offset());

   const Address size_of_locals    (rdx, ConstMethod::size_of_locals_offset());

   // const Address monitor_block_top (rbp, frame::interpreter_frame_monitor_block_top_offset * wordSize);

   // const Address monitor_block_bot (rbp, frame::interpreter_frame_initial_sp_offset        * wordSize);

   // const Address monitor(rbp, frame::interpreter_frame_initial_sp_offset * wordSize - (int)sizeof(BasicObjectLock));

   // get parameter size (always needed)

   __ movptr(rdx, constMethod);

   __ load_unsigned_short(rcx, size_of_parameters);

   // rbx: Method*

   // rcx: size of parameters

   __ load_unsigned_short(rdx, size_of_locals);                     // get size of locals in words

   __ subptr(rdx, rcx);                                             // rdx = no. of additional locals

   // see if we've got enough room on the stack for locals plus overhead.

   generate_stack_overflow_check();                                 // C++

   // c++ interpreter does not use stack banging or any implicit exceptions

   // leave for now to verify that check is proper.

   bang_stack_shadow_pages(false);

   // compute beginning of parameters (rdi)

   __ lea(locals, Address(rsp, rcx, Address::times_ptr, wordSize));

   // save sender's sp

   // __ movl(rcx, rsp);

   // get sender's sp

   __ pop(rcx);

   // get return address

   __ pop(rax);

   // rdx - # of additional locals

   // allocate space for locals

   // explicitly initialize locals

   {

     Label exit, loop;

     __ testl(rdx, rdx);                               // (32bit ok)

     __ jcc(Assembler::lessEqual, exit);               // do nothing if rdx <= 0

     __ bind(loop);

     __ push((int32_t)NULL_WORD);                      // initialize local variables

     __ decrement(rdx);                                // until everything initialized

     __ jcc(Assembler::greater, loop);

     __ bind(exit);

   }

   // Assumes rax = return address

   // allocate and initialize new interpreterState and method expression stack

   // IN(locals) ->  locals

   // IN(state) -> any current interpreter activation

   // destroys rax, rcx, rdx, rdi

   // OUT (state) -> new interpreterState

   // OUT(rsp) -> bottom of methods expression stack

   generate_compute_interpreter_state(state, locals, rcx, false);

   // Call interpreter

   Label call_interpreter;

   __ bind(call_interpreter);

   // c++ interpreter does not use stack banging or any implicit exceptions

   // leave for now to verify that check is proper.

   bang_stack_shadow_pages(false);

   // Call interpreter enter here if message is

   // set and we know stack size is valid

   Label call_interpreter_2;

   __ bind(call_interpreter_2);

   {

     const Register thread  = NOT_LP64(rcx) LP64_ONLY(r15_thread);

 #ifdef _LP64

     __ mov(c_rarg0, state);

 #else

     __ push(state);                                                 // push arg to interpreter

     __ movptr(thread, STATE(_thread));

 #endif // _LP64

     // We can setup 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

     //

     __ movptr(Address(thread, JavaThread::last_Java_fp_offset()), rbp);

     __ movptr(Address(thread, JavaThread::last_Java_sp_offset()), rsp);

     // Call the interpreter

     RuntimeAddress normal(CAST_FROM_FN_PTR(address, BytecodeInterpreter::run));

     RuntimeAddress checking(CAST_FROM_FN_PTR(address, BytecodeInterpreter::runWithChecks));

     __ call(JvmtiExport::can_post_interpreter_events() ? checking : normal);

     NOT_LP64(__ pop(rax);)                                          // discard parameter to run

     //

     // state is preserved since it is callee saved

     //

     // reset_last_Java_frame

     NOT_LP64(__ movl(thread, STATE(_thread));)

     __ reset_last_Java_frame(thread, true, true);

   }

   // examine msg from interpreter to determine next action

   __ movl(rdx, STATE(_msg));                                       // Get new message

   Label call_method;

   Label return_from_interpreted_method;

   Label throw_exception;

   Label bad_msg;

   Label do_OSR;

   __ cmpl(rdx, (int32_t)BytecodeInterpreter::call_method);

   __ jcc(Assembler::equal, call_method);

   __ cmpl(rdx, (int32_t)BytecodeInterpreter::return_from_method);

   __ jcc(Assembler::equal, return_from_interpreted_method);

   __ cmpl(rdx, (int32_t)BytecodeInterpreter::do_osr);

   __ jcc(Assembler::equal, do_OSR);

   __ cmpl(rdx, (int32_t)BytecodeInterpreter::throwing_exception);

   __ jcc(Assembler::equal, throw_exception);

   __ cmpl(rdx, (int32_t)BytecodeInterpreter::more_monitors);

   __ jcc(Assembler::notEqual, bad_msg);

   // Allocate more monitor space, shuffle expression stack....

   generate_more_monitors();

   __ jmp(call_interpreter);

   // uncommon trap needs to jump to here to enter the interpreter (re-execute current bytecode)

   unctrap_frame_manager_entry  = __ pc();

   //

   // Load the registers we need.

   __ lea(state, Address(rbp, -(int)sizeof(BytecodeInterpreter)));

   __ movptr(rsp, STATE(_stack_limit));                             // restore expression stack to full depth

   __ jmp(call_interpreter_2);

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

   // Returning from a compiled method into a deopted method. The bytecode at the

   // bcp has completed. The result of the bytecode is in the native abi (the tosca

   // for the template based interpreter). Any stack space that was used by the

   // bytecode that has completed has been removed (e.g. parameters for an invoke)

   // so all that we have to do is place any pending result on the expression stack

   // and resume execution on the next bytecode.

   generate_deopt_handling();

   __ jmp(call_interpreter);

   // Current frame has caught an exception we need to dispatch to the

   // handler. We can get here because a native interpreter frame caught

   // an exception in which case there is no handler and we must rethrow

   // If it is a vanilla interpreted frame the we simply drop into the

   // interpreter and let it do the lookup.

   Interpreter::_rethrow_exception_entry = __ pc();

   // rax: exception

   // rdx: return address/pc that threw exception

   Label return_with_exception;

   Label unwind_and_forward;

   // restore state pointer.

   __ lea(state, Address(rbp,  -(int)sizeof(BytecodeInterpreter)));

   __ movptr(rbx, STATE(_method));                       // get method

 #ifdef _LP64

   __ movptr(Address(r15_thread, Thread::pending_exception_offset()), rax);

 #else

   __ movl(rcx, STATE(_thread));                       // get thread

   // Store exception with interpreter will expect it

   __ movptr(Address(rcx, Thread::pending_exception_offset()), rax);

 #endif // _LP64

   // is current frame vanilla or native?

   __ movl(rdx, access_flags);

   __ testl(rdx, JVM_ACC_NATIVE);

   __ jcc(Assembler::zero, return_with_exception);     // vanilla interpreted frame, handle directly

   // We drop thru to unwind a native interpreted frame with a pending exception

   // We jump here for the initial interpreter frame with exception pending

   // We unwind the current acivation and forward it to our caller.

   __ bind(unwind_and_forward);

   // unwind rbp, return stack to unextended value and re-push return address

   __ movptr(rcx, STATE(_sender_sp));

   __ leave();

   __ pop(rdx);

   __ mov(rsp, rcx);

   __ push(rdx);

   __ jump(RuntimeAddress(StubRoutines::forward_exception_entry()));

   // Return point from a call which returns a result in the native abi

   // (c1/c2/jni-native). This result must be processed onto the java

   // expression stack.

   //

   // A pending exception may be present in which case there is no result present

   Label resume_interpreter;

   Label do_float;

   Label do_double;

   Label done_conv;

   // The FPU stack is clean if UseSSE >= 2 but must be cleaned in other cases

   if (UseSSE < 2) {

     __ lea(state, Address(rbp,  -(int)sizeof(BytecodeInterpreter)));

     __ movptr(rbx, STATE(_result._to_call._callee));                   // get method just executed

     __ movl(rcx, Address(rbx, Method::result_index_offset()));

     __ cmpl(rcx, AbstractInterpreter::BasicType_as_index(T_FLOAT));    // Result stub address array index

     __ jcc(Assembler::equal, do_float);

     __ cmpl(rcx, AbstractInterpreter::BasicType_as_index(T_DOUBLE));    // Result stub address array index

     __ jcc(Assembler::equal, do_double);

 #if !defined(_LP64) || defined(COMPILER1) || !defined(COMPILER2)

     __ empty_FPU_stack();

 #endif // COMPILER2

     __ jmp(done_conv);

     __ bind(do_float);

 #ifdef COMPILER2

     for (int i = 1; i < 8; i++) {

       __ ffree(i);

     }

 #endif // COMPILER2

     __ jmp(done_conv);

     __ bind(do_double);

 #ifdef COMPILER2

     for (int i = 1; i < 8; i++) {

       __ ffree(i);

     }

 #endif // COMPILER2

     __ jmp(done_conv);

   } else {

     __ MacroAssembler::verify_FPU(0, "generate_return_entry_for compiled");

     __ jmp(done_conv);

   }

   // Return point to interpreter from compiled/native method

   InternalAddress return_from_native_method(__ pc());

   __ bind(done_conv);

   // Result if any is in tosca. The java expression stack is in the state that the

   // calling convention left it (i.e. params may or may not be present)

   // Copy the result from tosca and place it on java expression stack.

   // Restore rsi/r13 as compiled code may not preserve it

   __ lea(state, Address(rbp,  -(int)sizeof(BytecodeInterpreter)));

   // restore stack to what we had when we left (in case i2c extended it)

   __ movptr(rsp, STATE(_stack));

   __ lea(rsp, Address(rsp, wordSize));

   // If there is a pending exception then we don't really have a result to process

 #ifdef _LP64

   __ cmpptr(Address(r15_thread, Thread::pending_exception_offset()), (int32_t)NULL_WORD);

 #else

   __ movptr(rcx, STATE(_thread));                       // get thread

   __ cmpptr(Address(rcx, Thread::pending_exception_offset()), (int32_t)NULL_WORD);

 #endif // _LP64

   __ jcc(Assembler::notZero, return_with_exception);

   // get method just executed

   __ movptr(rbx, STATE(_result._to_call._callee));

   // callee left args on top of expression stack, remove them

   __ movptr(rcx, constMethod);

   __ load_unsigned_short(rcx, Address(rcx, ConstMethod::size_of_parameters_offset()));

   __ lea(rsp, Address(rsp, rcx, Address::times_ptr));

   __ movl(rcx, Address(rbx, Method::result_index_offset()));

   ExternalAddress tosca_to_stack((address)CppInterpreter::_tosca_to_stack);

   // Address index(noreg, rax, Address::times_ptr);

   __ movptr(rcx, ArrayAddress(tosca_to_stack, Address(noreg, rcx, Address::times_ptr)));

   // __ movl(rcx, Address(noreg, rcx, Address::times_ptr, int(AbstractInterpreter::_tosca_to_stack)));

   __ call(rcx);                                               // call result converter

   __ jmp(resume_interpreter);

   // An exception is being caught on return to a vanilla interpreter frame.

   // Empty the stack and resume interpreter

   __ bind(return_with_exception);

   // Exception present, empty stack

   __ movptr(rsp, STATE(_stack_base));

   __ jmp(resume_interpreter);

   // Return from interpreted method we return result appropriate to the caller (i.e. "recursive"

   // interpreter call, or native) and unwind this interpreter activation.

   // All monitors should be unlocked.

   __ bind(return_from_interpreted_method);

   Label return_to_initial_caller;

   __ movptr(rbx, STATE(_method));                                   // get method just executed

   __ cmpptr(STATE(_prev_link), (int32_t)NULL_WORD);                 // returning from "recursive" interpreter call?

   __ movl(rax, Address(rbx, Method::result_index_offset())); // get result type index

   __ jcc(Assembler::equal, return_to_initial_caller);               // back to native code (call_stub/c1/c2)

   // Copy result to callers java stack

   ExternalAddress stack_to_stack((address)CppInterpreter::_stack_to_stack);

   // Address index(noreg, rax, Address::times_ptr);

   __ movptr(rax, ArrayAddress(stack_to_stack, Address(noreg, rax, Address::times_ptr)));

   // __ movl(rax, Address(noreg, rax, Address::times_ptr, int(AbstractInterpreter::_stack_to_stack)));

   __ call(rax);                                                     // call result converter

   Label unwind_recursive_activation;

   __ bind(unwind_recursive_activation);

   // returning to interpreter method from "recursive" interpreter call

   // result converter left rax pointing to top of the java stack for method we are returning

   // to. Now all we must do is unwind the state from the completed call

   __ movptr(state, STATE(_prev_link));                              // unwind state

   __ leave();                                                       // pop the frame

   __ mov(rsp, rax);                                                 // unwind stack to remove args

   // Resume the interpreter. The current frame contains the current interpreter

   // state object.

   //

   __ bind(resume_interpreter);

   // state == interpreterState object for method we are resuming

   __ movl(STATE(_msg), (int)BytecodeInterpreter::method_resume);

   __ lea(rsp, Address(rsp, -wordSize));                            // prepush stack (result if any already present)

   __ movptr(STATE(_stack), rsp);                                   // inform interpreter of new stack depth (parameters removed,

                                                                    // result if any on stack already )

   __ movptr(rsp, STATE(_stack_limit));                             // restore expression stack to full depth

   __ jmp(call_interpreter_2);                                      // No need to bang

   // interpreter returning to native code (call_stub/c1/c2)

   // convert result and unwind initial activation

   // rax - result index

   __ bind(return_to_initial_caller);

   ExternalAddress stack_to_native((address)CppInterpreter::_stack_to_native_abi);

   // Address index(noreg, rax, Address::times_ptr);

   __ movptr(rax, ArrayAddress(stack_to_native, Address(noreg, rax, Address::times_ptr)));

   __ call(rax);                                                    // call result converter

   Label unwind_initial_activation;

   __ bind(unwind_initial_activation);

   // RETURN TO CALL_STUB/C1/C2 code (result if any in rax/rdx ST(0))

   /* Current stack picture

         [ incoming parameters ]

         [ extra locals ]

         [ return address to CALL_STUB/C1/C2]

   fp -> [ CALL_STUB/C1/C2 fp ]

         BytecodeInterpreter object

         expression stack

   sp ->

   */

   // return restoring the stack to the original sender_sp value

   __ movptr(rcx, STATE(_sender_sp));

   __ leave();

   __ pop(rdi);                                                        // get return address

   // set stack to sender's sp

   __ mov(rsp, rcx);

   __ jmp(rdi);                                                        // return to call_stub

   // OSR request, adjust return address to make current frame into adapter frame

   // and enter OSR nmethod

   __ bind(do_OSR);

   Label remove_initial_frame;

   // We are going to pop this frame. Is there another interpreter frame underneath

   // it or is it callstub/compiled?

   // Move buffer to the expected parameter location

   __ movptr(rcx, STATE(_result._osr._osr_buf));

   __ movptr(rax, STATE(_result._osr._osr_entry));

   __ cmpptr(STATE(_prev_link), (int32_t)NULL_WORD);            // returning from "recursive" interpreter call?

   __ jcc(Assembler::equal, remove_initial_frame);              // back to native code (call_stub/c1/c2)

   __ movptr(sender_sp_on_entry, STATE(_sender_sp));            // get sender's sp in expected register

   __ leave();                                                  // pop the frame

   __ mov(rsp, sender_sp_on_entry);                             // trim any stack expansion

   // We know we are calling compiled so push specialized return

   // method uses specialized entry, push a return so we look like call stub setup

   // this path will handle fact that result is returned in registers and not

   // on the java stack.

   __ pushptr(return_from_native_method.addr());

   __ jmp(rax);

   __ bind(remove_initial_frame);

   __ movptr(rdx, STATE(_sender_sp));

   __ leave();

   // get real return

   __ pop(rsi);

   // set stack to sender's sp

   __ mov(rsp, rdx);

   // repush real return

   __ push(rsi);

   // Enter OSR nmethod

   __ jmp(rax);

   // Call a new method. All we do is (temporarily) trim the expression stack

   // push a return address to bring us back to here and leap to the new entry.

   __ bind(call_method);

   // stack points to next free location and not top element on expression stack

   // method expects sp to be pointing to topmost element

   __ movptr(rsp, STATE(_stack));                                     // pop args to c++ interpreter, set sp to java stack top

   __ lea(rsp, Address(rsp, wordSize));

   __ movptr(rbx, STATE(_result._to_call._callee));                   // get method to execute

   // don't need a return address if reinvoking interpreter

   // Make it look like call_stub calling conventions

   // Get (potential) receiver

   // get size of parameters in words

   __ movptr(rcx, constMethod);

   __ load_unsigned_short(rcx, Address(rcx, ConstMethod::size_of_parameters_offset()));

   ExternalAddress recursive(CAST_FROM_FN_PTR(address, RecursiveInterpreterActivation));

   __ pushptr(recursive.addr());                                      // make it look good in the debugger

   InternalAddress entry(entry_point);

   __ cmpptr(STATE(_result._to_call._callee_entry_point), entry.addr()); // returning to interpreter?

   __ jcc(Assembler::equal, re_dispatch);                             // yes

   __ pop(rax);                                                       // pop dummy address

   // get specialized entry

   __ movptr(rax, STATE(_result._to_call._callee_entry_point));

   // set sender SP

   __ mov(sender_sp_on_entry, rsp);

   // method uses specialized entry, push a return so we look like call stub setup

   // this path will handle fact that result is returned in registers and not

   // on the java stack.

   __ pushptr(return_from_native_method.addr());

   __ jmp(rax);

   __ bind(bad_msg);

   __ stop("Bad message from interpreter");

   // Interpreted method "returned" with an exception pass it on...

   // Pass result, unwind activation and continue/return to interpreter/call_stub

   // We handle result (if any) differently based on return to interpreter or call_stub

   Label unwind_initial_with_pending_exception;

   __ bind(throw_exception);

   __ cmpptr(STATE(_prev_link), (int32_t)NULL_WORD);                 // returning from recursive interpreter call?

   __ jcc(Assembler::equal, unwind_initial_with_pending_exception);  // no, back to native code (call_stub/c1/c2)

   __ movptr(rax, STATE(_locals));                                   // pop parameters get new stack value

   __ addptr(rax, wordSize);                                         // account for prepush before we return

   __ jmp(unwind_recursive_activation);

   __ bind(unwind_initial_with_pending_exception);

   // We will unwind the current (initial) interpreter frame and forward

   // the exception to the caller. We must put the exception in the

   // expected register and clear pending exception and then forward.

   __ jmp(unwind_and_forward);

   interpreter_frame_manager = entry_point;

   return entry_point;

 }

 address AbstractInterpreterGenerator::generate_method_entry(AbstractInterpreter::MethodKind kind) {

   // determine code generation flags

   bool synchronized = false;

   address entry_point = NULL;

   switch (kind) {

     case Interpreter::zerolocals             :                                                                             break;

     case Interpreter::zerolocals_synchronized: synchronized = true;                                                        break;

     case Interpreter::native                 : entry_point = ((InterpreterGenerator*)this)->generate_native_entry(false);  break;

     case Interpreter::native_synchronized    : entry_point = ((InterpreterGenerator*)this)->generate_native_entry(true);   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     : // fall thru

     case Interpreter::java_lang_math_cos     : // fall thru

     case Interpreter::java_lang_math_tan     : // fall thru

     case Interpreter::java_lang_math_abs     : // fall thru

     case Interpreter::java_lang_math_log     : // fall thru

     case Interpreter::java_lang_math_log10   : // fall thru

     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();                                                       break;

   }

   if (entry_point) return entry_point;

   return ((InterpreterGenerator*)this)->generate_normal_entry(synchronized);

 }

 InterpreterGenerator::InterpreterGenerator(StubQueue* code)

  : CppInterpreterGenerator(code) {

    generate_all(); // down here so it can be "virtual"

 }

 // Deoptimization helpers for C++ interpreter

 // How much stack a method activation needs in words.

 int AbstractInterpreter::size_top_interpreter_activation(Method* method) {

   const int stub_code = 4;  // see generate_call_stub

   // Save space for one monitor to get into the interpreted method in case

   // the method is synchronized

   int monitor_size    = method->is_synchronized() ?

                                 1*frame::interpreter_frame_monitor_size() : 0;

   // total static overhead size. Account for interpreter state object, return

   // address, saved rbp and 2 words for a "static long no_params() method" issue.

   const int overhead_size = sizeof(BytecodeInterpreter)/wordSize +

     ( frame::sender_sp_offset - frame::link_offset) + 2;

   const int method_stack = (method->max_locals() + method->max_stack()) *

                            Interpreter::stackElementWords;

   return overhead_size + method_stack + stub_code;

 }

 // returns the activation size.

 static int size_activation_helper(int extra_locals_size, int monitor_size) {

   return (extra_locals_size +                  // the addition space for locals

           2*BytesPerWord +                     // return address and saved rbp

           2*BytesPerWord +                     // "static long no_params() method" issue

           sizeof(BytecodeInterpreter) +               // interpreterState

           monitor_size);                       // monitors

 }

 void BytecodeInterpreter::layout_interpreterState(interpreterState to_fill,

                                            frame* caller,

                                            frame* current,

                                            Method* method,

                                            intptr_t* locals,

                                            intptr_t* stack,

                                            intptr_t* stack_base,

                                            intptr_t* monitor_base,

                                            intptr_t* frame_bottom,

                                            bool is_top_frame

                                            )

 {

   // What about any vtable?

   //

   to_fill->_thread = JavaThread::current();

   // This gets filled in later but make it something recognizable for now

   to_fill->_bcp = method->code_base();

   to_fill->_locals = locals;

   to_fill->_constants = method->constants()->cache();

   to_fill->_method = method;

   to_fill->_mdx = NULL;

   to_fill->_stack = stack;

   if (is_top_frame && JavaThread::current()->popframe_forcing_deopt_reexecution() ) {

     to_fill->_msg = deopt_resume2;

   } else {

     to_fill->_msg = method_resume;

   }

   to_fill->_result._to_call._bcp_advance = 0;

   to_fill->_result._to_call._callee_entry_point = NULL; // doesn't matter to anyone

   to_fill->_result._to_call._callee = NULL; // doesn't matter to anyone

   to_fill->_prev_link = NULL;

   to_fill->_sender_sp = caller->unextended_sp();

   if (caller->is_interpreted_frame()) {

     interpreterState prev  = caller->get_interpreterState();

     to_fill->_prev_link = prev;

     // *current->register_addr(GR_Iprev_state) = (intptr_t) prev;

     // Make the prev callee look proper

     prev->_result._to_call._callee = method;

     if (*prev->_bcp == Bytecodes::_invokeinterface) {

       prev->_result._to_call._bcp_advance = 5;

     } else {

       prev->_result._to_call._bcp_advance = 3;

     }

   }

   to_fill->_oop_temp = NULL;

   to_fill->_stack_base = stack_base;

   // Need +1 here because stack_base points to the word just above the first expr stack entry

   // and stack_limit is supposed to point to the word just below the last expr stack entry.

   // See generate_compute_interpreter_state.

   to_fill->_stack_limit = stack_base - (method->max_stack() + 1);

   to_fill->_monitor_base = (BasicObjectLock*) monitor_base;

   to_fill->_self_link = to_fill;

   assert(stack >= to_fill->_stack_limit && stack < to_fill->_stack_base,

          "Stack top out of range");

 }

 static int frame_size_helper(int max_stack,

                              int tempcount,

                              int moncount,

                              int callee_param_count,

                              int callee_locals,

                              bool is_top_frame,

                              int& monitor_size,

                              int& full_frame_size) {

   int extra_locals_size = (callee_locals - callee_param_count) * BytesPerWord;

   monitor_size = sizeof(BasicObjectLock) * moncount;

   // First calculate the frame size without any java expression stack

   int short_frame_size = size_activation_helper(extra_locals_size,

                                                 monitor_size);

   // Now with full size expression stack

   full_frame_size = short_frame_size + max_stack * BytesPerWord;

   // and now with only live portion of the expression stack

   short_frame_size = short_frame_size + tempcount * BytesPerWord;

   // the size the activation is right now. Only top frame is full size

   int frame_size = (is_top_frame ? full_frame_size : short_frame_size);

   return frame_size;

 }

 int AbstractInterpreter::size_activation(int max_stack,

                                          int tempcount,

                                          int extra_args,

                                          int moncount,

                                          int callee_param_count,

                                          int callee_locals,

                                          bool is_top_frame) {

   assert(extra_args == 0, "FIX ME");

   // NOTE: return size is in words not bytes

   // Calculate the amount our frame will be adjust by the callee. For top frame

   // this is zero.

   // NOTE: ia64 seems to do this wrong (or at least backwards) in that it

   // calculates the extra locals based on itself. Not what the callee does

   // to it. So it ignores last_frame_adjust value. Seems suspicious as far

   // as getting sender_sp correct.

   int unused_monitor_size = 0;

   int unused_full_frame_size = 0;

   return frame_size_helper(max_stack, tempcount, moncount, callee_param_count, callee_locals,

                            is_top_frame, unused_monitor_size, unused_full_frame_size)/BytesPerWord;

 }

 void AbstractInterpreter::layout_activation(Method* 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,

                                             bool is_bottom_frame) {

   assert(popframe_extra_args == 0, "FIX ME");

   // NOTE this code must exactly mimic what InterpreterGenerator::generate_compute_interpreter_state()

   // does as far as allocating an interpreter frame.

   // Set up the method, locals, and monitors.

   // The frame interpreter_frame is guaranteed to be the right size,

   // as determined by a previous call to the size_activation() method.

   // It is also guaranteed to be walkable even though it is in a skeletal state

   // NOTE: tempcount is the current size of the java expression stack. For top most

   //       frames we will allocate a full sized expression stack and not the curback

   //       version that non-top frames have.

   int monitor_size = 0;

   int full_frame_size = 0;

   int frame_size = frame_size_helper(method->max_stack(), tempcount, moncount, callee_param_count, callee_locals,

                                      is_top_frame, monitor_size, full_frame_size);

 #ifdef ASSERT

   assert(caller->unextended_sp() == interpreter_frame->interpreter_frame_sender_sp(), "Frame not properly walkable");

 #endif

   // MUCHO HACK

   intptr_t* frame_bottom = (intptr_t*) ((intptr_t)interpreter_frame->sp() - (full_frame_size - frame_size));

   /* Now fillin the interpreterState object */

   // The state object is the first thing on the frame and easily located

   interpreterState cur_state = (interpreterState) ((intptr_t)interpreter_frame->fp() - sizeof(BytecodeInterpreter));

   // Find the locals pointer. This is rather simple on x86 because there is no

   // confusing rounding at the callee to account for. We can trivially locate

   // our locals based on the current fp().

   // Note: the + 2 is for handling the "static long no_params() method" issue.

   // (too bad I don't really remember that issue well...)

   intptr_t* locals;

   // If the caller is interpreted we need to make sure that locals points to the first

   // argument that the caller passed and not in an area where the stack might have been extended.

   // because the stack to stack to converter needs a proper locals value in order to remove the

   // arguments from the caller and place the result in the proper location. Hmm maybe it'd be

   // simpler if we simply stored the result in the BytecodeInterpreter object and let the c++ code

   // adjust the stack?? HMMM QQQ

   //

   if (caller->is_interpreted_frame()) {

     // locals must agree with the caller because it will be used to set the

     // caller's tos when we return.

     interpreterState prev  = caller->get_interpreterState();

     // stack() is prepushed.

     locals = prev->stack() + method->size_of_parameters();

     // locals = caller->unextended_sp() + (method->size_of_parameters() - 1);

     if (locals != interpreter_frame->fp() + frame::sender_sp_offset + (method->max_locals() - 1) + 2) {

       // os::breakpoint();

     }

   } else {

     // this is where a c2i would have placed locals (except for the +2)

     locals = interpreter_frame->fp() + frame::sender_sp_offset + (method->max_locals() - 1) + 2;

   }

   intptr_t* monitor_base = (intptr_t*) cur_state;

   intptr_t* stack_base = (intptr_t*) ((intptr_t) monitor_base - monitor_size);

   /* +1 because stack is always prepushed */

   intptr_t* stack = (intptr_t*) ((intptr_t) stack_base - (tempcount + 1) * BytesPerWord);

   BytecodeInterpreter::layout_interpreterState(cur_state,

                                                caller,

                                                interpreter_frame,

                                                method,

                                                locals,

                                                stack,

                                                stack_base,

                                                monitor_base,

                                                frame_bottom,

                                                is_top_frame);

   // BytecodeInterpreter::pd_layout_interpreterState(cur_state, interpreter_return_address, interpreter_frame->fp());

 }

 #endif // CC_INTERP (all)