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 /*

  * Copyright (c) 1997, 2013, 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/interpreter.hpp"

 #include "interpreter/interpreterGenerator.hpp"

 #include "interpreter/interpreterRuntime.hpp"

 #include "interpreter/templateTable.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/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"

 #define __ _masm->

 #ifndef CC_INTERP

 const int method_offset = frame::interpreter_frame_method_offset * wordSize;

 const int bci_offset    = frame::interpreter_frame_bcx_offset    * wordSize;

 const int locals_offset = frame::interpreter_frame_locals_offset * wordSize;

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

 address TemplateInterpreterGenerator::generate_StackOverflowError_handler() {

   address entry = __ pc();

   // Note: There should be a minimal interpreter frame set up when stack

   // overflow occurs since we check explicitly for it now.

   //

 #ifdef ASSERT

   { Label L;

     __ lea(rax, Address(rbp,

                 frame::interpreter_frame_monitor_block_top_offset * wordSize));

     __ cmpptr(rax, rsp);  // rax, = maximal rsp for current rbp,

                         //  (stack grows negative)

     __ jcc(Assembler::aboveEqual, L); // check if frame is complete

     __ stop ("interpreter frame not set up");

     __ bind(L);

   }

 #endif // ASSERT

   // Restore bcp under the assumption that the current frame is still

   // interpreted

   __ restore_bcp();

   // expression stack must be empty before entering the VM if an exception

   // happened

   __ empty_expression_stack();

   __ empty_FPU_stack();

   // throw exception

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

   return entry;

 }

 address TemplateInterpreterGenerator::generate_ArrayIndexOutOfBounds_handler(const char* name) {

   address entry = __ pc();

   // expression stack must be empty before entering the VM if an exception happened

   __ empty_expression_stack();

   __ empty_FPU_stack();

   // setup parameters

   // ??? convention: expect aberrant index in register rbx,

   __ lea(rax, ExternalAddress((address)name));

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

   return entry;

 }

 address TemplateInterpreterGenerator::generate_ClassCastException_handler() {

   address entry = __ pc();

   // object is at TOS

   __ pop(rax);

   // expression stack must be empty before entering the VM if an exception

   // happened

   __ empty_expression_stack();

   __ empty_FPU_stack();

   __ call_VM(noreg,

              CAST_FROM_FN_PTR(address,

                               InterpreterRuntime::throw_ClassCastException),

              rax);

   return entry;

 }

 address TemplateInterpreterGenerator::generate_exception_handler_common(const char* name, const char* message, bool pass_oop) {

   assert(!pass_oop || message == NULL, "either oop or message but not both");

   address entry = __ pc();

   if (pass_oop) {

     // object is at TOS

     __ pop(rbx);

   }

   // expression stack must be empty before entering the VM if an exception happened

   __ empty_expression_stack();

   __ empty_FPU_stack();

   // setup parameters

   __ lea(rax, ExternalAddress((address)name));

   if (pass_oop) {

     __ call_VM(rax, CAST_FROM_FN_PTR(address, InterpreterRuntime::create_klass_exception), rax, rbx);

   } else {

     if (message != NULL) {

       __ lea(rbx, ExternalAddress((address)message));

     } else {

       __ movptr(rbx, NULL_WORD);

     }

     __ call_VM(rax, CAST_FROM_FN_PTR(address, InterpreterRuntime::create_exception), rax, rbx);

   }

   // throw exception

   __ jump(ExternalAddress(Interpreter::throw_exception_entry()));

   return entry;

 }

 address TemplateInterpreterGenerator::generate_continuation_for(TosState state) {

   address entry = __ pc();

   // NULL last_sp until next java call

   __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), NULL_WORD);

   __ dispatch_next(state);

   return entry;

 }

 address TemplateInterpreterGenerator::generate_return_entry_for(TosState state, int step) {

   TosState incoming_state = state;

   address entry = __ pc();

 #ifdef COMPILER2

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

   if ((incoming_state == ftos && UseSSE < 1) || (incoming_state == dtos && UseSSE < 2)) {

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

         __ ffree(i);

     }

   } else if (UseSSE < 2) {

     __ empty_FPU_stack();

   }

 #endif

   if ((incoming_state == ftos && UseSSE < 1) || (incoming_state == dtos && UseSSE < 2)) {

     __ MacroAssembler::verify_FPU(1, "generate_return_entry_for compiled");

   } else {

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

   }

   // In SSE mode, interpreter returns FP results in xmm0 but they need

   // to end up back on the FPU so it can operate on them.

   if (incoming_state == ftos && UseSSE >= 1) {

     __ subptr(rsp, wordSize);

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

     __ fld_s(Address(rsp, 0));

     __ addptr(rsp, wordSize);

   } else if (incoming_state == dtos && UseSSE >= 2) {

     __ subptr(rsp, 2*wordSize);

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

     __ fld_d(Address(rsp, 0));

     __ addptr(rsp, 2*wordSize);

   }

   __ MacroAssembler::verify_FPU(state == ftos || state == dtos ? 1 : 0, "generate_return_entry_for in interpreter");

   // Restore stack bottom in case i2c adjusted stack

   __ movptr(rsp, Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize));

   // and NULL it as marker that rsp is now tos until next java call

   __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), NULL_WORD);

   __ restore_bcp();

   __ restore_locals();

   if (incoming_state == atos) {

     Register mdp = rbx;

     Register tmp = rcx;

     __ profile_return_type(mdp, rax, tmp);

   }

   Label L_got_cache, L_giant_index;

   if (EnableInvokeDynamic) {

     __ cmpb(Address(rsi, 0), Bytecodes::_invokedynamic);

     __ jcc(Assembler::equal, L_giant_index);

   }

   __ get_cache_and_index_at_bcp(rbx, rcx, 1, sizeof(u2));

   __ bind(L_got_cache);

   __ movl(rbx, Address(rbx, rcx,

                     Address::times_ptr, ConstantPoolCache::base_offset() +

                     ConstantPoolCacheEntry::flags_offset()));

   __ andptr(rbx, 0xFF);

   __ lea(rsp, Address(rsp, rbx, Interpreter::stackElementScale()));

   __ dispatch_next(state, step);

   // out of the main line of code...

   if (EnableInvokeDynamic) {

     __ bind(L_giant_index);

     __ get_cache_and_index_at_bcp(rbx, rcx, 1, sizeof(u4));

     __ jmp(L_got_cache);

   }

   return entry;

 }

 address TemplateInterpreterGenerator::generate_deopt_entry_for(TosState state, int step) {

   address entry = __ pc();

   // In SSE mode, FP results are in xmm0

   if (state == ftos && UseSSE > 0) {

     __ subptr(rsp, wordSize);

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

     __ fld_s(Address(rsp, 0));

     __ addptr(rsp, wordSize);

   } else if (state == dtos && UseSSE >= 2) {

     __ subptr(rsp, 2*wordSize);

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

     __ fld_d(Address(rsp, 0));

     __ addptr(rsp, 2*wordSize);

   }

   __ MacroAssembler::verify_FPU(state == ftos || state == dtos ? 1 : 0, "generate_deopt_entry_for in interpreter");

   // The stack is not extended by deopt but we must NULL last_sp as this

   // entry is like a "return".

   __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), NULL_WORD);

   __ restore_bcp();

   __ restore_locals();

   // handle exceptions

   { Label L;

     const Register thread = rcx;

     __ get_thread(thread);

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

     __ jcc(Assembler::zero, L);

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

     __ should_not_reach_here();

     __ bind(L);

   }

   __ dispatch_next(state, step);

   return entry;

 }

 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    : // fall through

     case T_LONG   : // fall through

     case T_VOID   : i = 4; break;

     case T_FLOAT  : i = 5; break;  // have to treat float and double separately for SSE

     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;

 }

 address TemplateInterpreterGenerator::generate_result_handler_for(BasicType type) {

   address entry = __ pc();

   switch (type) {

     case T_BOOLEAN: __ c2bool(rax);            break;

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

     case T_BYTE   : __ sign_extend_byte (rax); break;

     case T_SHORT  : __ sign_extend_short(rax); break;

     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) {

           // Load ST0

           __ fld_d(Address(rsp, 0));

           // Store as float and empty fpu stack

           __ fstp_s(Address(rsp, 0));

           // 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, Address(rbp, frame::interpreter_frame_oop_temp_offset*wordSize));

       // and verify it

       __ verify_oop(rax);

       break;

     default       : ShouldNotReachHere();

   }

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

   return entry;

 }

 address TemplateInterpreterGenerator::generate_safept_entry_for(TosState state, address runtime_entry) {

   address entry = __ pc();

   __ push(state);

   __ call_VM(noreg, runtime_entry);

   __ dispatch_via(vtos, Interpreter::_normal_table.table_for(vtos));

   return entry;

 }

 // 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;

   // Note: In tiered we increment either counters in MethodCounters* or in MDO

   // depending if we're profiling or not.

   if (TieredCompilation) {

     int increment = InvocationCounter::count_increment;

     int mask = ((1 << Tier0InvokeNotifyFreqLog)  - 1) << InvocationCounter::count_shift;

     Label no_mdo;

     if (ProfileInterpreter) {

       // Are we profiling?

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

       __ testptr(rax, rax);

       __ jccb(Assembler::zero, no_mdo);

       // Increment counter in the MDO

       const Address mdo_invocation_counter(rax, in_bytes(MethodData::invocation_counter_offset()) +

                                                 in_bytes(InvocationCounter::counter_offset()));

       __ increment_mask_and_jump(mdo_invocation_counter, increment, mask, rcx, false, Assembler::zero, overflow);

       __ jmp(done);

     }

     __ bind(no_mdo);

     // Increment counter in MethodCounters

     const Address invocation_counter(rax,

                   MethodCounters::invocation_counter_offset() +

                   InvocationCounter::counter_offset());

     __ get_method_counters(rbx, rax, done);

     __ increment_mask_and_jump(invocation_counter, increment, mask,

                                rcx, false, Assembler::zero, overflow);

     __ bind(done);

   } else {

     const Address backedge_counter  (rax,

                   MethodCounters::backedge_counter_offset() +

                   InvocationCounter::counter_offset());

     const Address invocation_counter(rax,

                   MethodCounters::invocation_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);

     __ incrementl(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.

     if (ProfileInterpreter && profile_method != NULL) {

       // Test to see if we should create a method data oop

       __ cmp32(rcx,

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

       __ jcc(Assembler::less, *profile_method_continue);

       // if no method data exists, go to profile_method

       __ test_method_data_pointer(rax, *profile_method);

     }

     __ cmp32(rcx,

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

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

     __ bind(done);

   }

 }

 void InterpreterGenerator::generate_counter_overflow(Label* do_continue) {

   // Asm interpreter on entry

   // rdi - locals

   // rsi - bcp

   // rbx, - method

   // rdx - cpool

   // rbp, - interpreter frame

   // C++ interpreter on entry

   // rsi - 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 - 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, (intptr_t)false);

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

   __ movptr(rbx, Address(rbp, method_offset));   // restore Method*

   // Preserve invariant that rsi/rdi contain bcp/locals of sender frame

   // and jump to the interpreted entry.

   __ 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*

   // 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_x86.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 = -(frame::interpreter_frame_initial_sp_offset*wordSize) + entry_size;

   const int page_size = os::vm_page_size();

   Label after_frame_check;

   // see if the frame is greater than one page in size. If so,

   // then we need to verify there is enough stack space remaining

   // for the additional locals.

   __ cmpl(rdx, (page_size - overhead_size)/Interpreter::stackElementSize);

   __ jcc(Assembler::belowEqual, 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;

   __ push(rsi);

   const Register thread = rsi;

   __ 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

   __ lea(rax, Address(noreg, 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)NULL_WORD);

   __ 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, 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);

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

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

                                                                               (StackRedPages+StackYellowPages);

   __ addptr(rax, max_pages * page_size);

   // check against the current stack bottom

   __ cmpptr(rsp, rax);

   __ jcc(Assembler::above, after_frame_check_pop);

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

   // Restore sender's sp as SP. This is necessary if the sender's

   // frame is an extended compiled frame (see gen_c2i_adapter())

   // and safer anyway in case of JSR292 adaptations.

   __ pop(rax); // return address must be moved if SP is changed

   __ mov(rsp, rsi);

   __ push(rax);

   // Note: the restored frame is not necessarily interpreted.

   // Use the shared runtime version of the StackOverflowError.

   assert(StubRoutines::throw_StackOverflowError_entry() != NULL, "stub not yet generated");

   __ jump(ExternalAddress(StubRoutines::throw_StackOverflowError_entry()));

   // all done with frame size check

   __ bind(after_frame_check_pop);

   __ pop(rsi);

   __ bind(after_frame_check);

 }

 // Allocate monitor and lock method (asm interpreter)

 // rbx, - Method*

 //

 void InterpreterGenerator::lock_method(void) {

   // synchronize method

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

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

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

   #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);

     __ testl(rax, JVM_ACC_STATIC);

     __ movptr(rax, Address(rdi, Interpreter::local_offset_in_bytes(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(monitor_block_top, rsp);                                    // set new monitor block top

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

   __ mov(rdx, rsp);                                                    // object address

   __ lock_object(rdx);

 }

 //

 // Generate a fixed interpreter frame. This is identical setup for interpreted methods

 // and for native methods hence the shared code.

 void TemplateInterpreterGenerator::generate_fixed_frame(bool native_call) {

   // initialize fixed part of activation frame

   __ push(rax);                                       // save return address

   __ enter();                                         // save old & set new rbp,

   __ push(rsi);                                       // set sender sp

   __ push((int32_t)NULL_WORD);                        // leave last_sp as null

   __ movptr(rsi, Address(rbx,Method::const_offset())); // get ConstMethod*

   __ lea(rsi, Address(rsi,ConstMethod::codes_offset())); // get codebase

   __ push(rbx);                                      // save Method*

   if (ProfileInterpreter) {

     Label method_data_continue;

     __ movptr(rdx, Address(rbx, in_bytes(Method::method_data_offset())));

     __ testptr(rdx, rdx);

     __ jcc(Assembler::zero, method_data_continue);

     __ addptr(rdx, in_bytes(MethodData::data_offset()));

     __ bind(method_data_continue);

     __ push(rdx);                                       // set the mdp (method data pointer)

   } else {

     __ push(0);

   }

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

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

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

   __ push(rdx);                                       // set constant pool cache

   __ push(rdi);                                       // set locals pointer

   if (native_call) {

     __ push(0);                                       // no bcp

   } else {

     __ push(rsi);                                     // set bcp

     }

   __ push(0);                                         // reserve word for pointer to expression stack bottom

   __ movptr(Address(rsp, 0), rsp);                    // set expression stack bottom

 }

 // End of helpers

 //

 // Various method entries

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

 //

 //

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

 address InterpreterGenerator::generate_accessor_entry(void) {

   // rbx,: Method*

   // rcx: receiver (preserve for slow entry into asm interpreter)

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

   address entry_point = __ pc();

   Label xreturn_path;

   // do fastpath for resolved accessor methods

   if (UseFastAccessorMethods) {

     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: 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, 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();

     __ 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;

     __ cmpl(rdx, atos);

     __ jcc(Assembler::equal, okay);

     __ cmpl(rdx, itos);

     __ jcc(Assembler::equal, okay);

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

     __ bind(okay);

 #endif // ASSERT

     // All the rest are a 32 bit wordsize

     // This is ok for now. Since fast accessors should be going away

     __ movptr(rax, field_address);

     __ bind(xreturn_path);

     // _ireturn/_areturn

     __ pop(rdi);                               // get return address

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

     __ jmp(rdi);

     // generate a vanilla interpreter entry as the slow path

     __ bind(slow_path);

     (void) generate_normal_entry(false);

     return entry_point;

   }

   return NULL;

 }

 // Method entry for java.lang.ref.Reference.get.

 address InterpreterGenerator::generate_Reference_get_entry(void) {

 #if INCLUDE_ALL_GCS

   // Code: _aload_0, _getfield, _areturn

   // parameter size = 1

   //

   // The code that gets generated by this routine is split into 2 parts:

   //    1. The "intrinsified" code for G1 (or any SATB based GC),

   //    2. The slow path - which is an expansion of the regular method entry.

   //

   // Notes:-

   // * In the G1 code we do not check whether we need to block for

   //   a safepoint. If G1 is enabled then we must execute the specialized

   //   code for Reference.get (except when the Reference object is null)

   //   so that we can log the value in the referent field with an SATB

   //   update buffer.

   //   If the code for the getfield template is modified so that the

   //   G1 pre-barrier code is executed when the current method is

   //   Reference.get() then going through the normal method entry

   //   will be fine.

   // * The G1 code below can, however, check the receiver object (the instance

   //   of java.lang.Reference) and jump to the slow path if null. If the

   //   Reference object is null then we obviously cannot fetch the referent

   //   and so we don't need to call the G1 pre-barrier. Thus we can use the

   //   regular method entry code to generate the NPE.

   //

   // This code is based on generate_accessor_enty.

   // rbx,: Method*

   // rcx: receiver (preserve for slow entry into asm interpreter)

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

   address entry = __ pc();

   const int referent_offset = java_lang_ref_Reference::referent_offset;

   guarantee(referent_offset > 0, "referent offset not initialized");

   if (UseG1GC) {

     Label slow_path;

     // Check if local 0 != NULL

     // If the receiver is null then it is OK to jump to the slow path.

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

     __ testptr(rax, rax);

     __ jcc(Assembler::zero, slow_path);

     // rax: local 0 (must be preserved across the G1 barrier call)

     //

     // rbx: method (at this point it's scratch)

     // rcx: receiver (at this point it's scratch)

     // rdx: scratch

     // rdi: scratch

     //

     // rsi: sender sp

     // Preserve the sender sp in case the pre-barrier

     // calls the runtime

     __ push(rsi);

     // Load the value of the referent field.

     const Address field_address(rax, referent_offset);

     __ movptr(rax, field_address);

     // Generate the G1 pre-barrier code to log the value of

     // the referent field in an SATB buffer.

     __ get_thread(rcx);

     __ g1_write_barrier_pre(noreg /* obj */,

                             rax /* pre_val */,

                             rcx /* thread */,

                             rbx /* tmp */,

                             true /* tosca_save */,

                             true /* expand_call */);

     // _areturn

     __ pop(rsi);                // get sender sp

     __ pop(rdi);                // get return address

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

     __ jmp(rdi);

     __ bind(slow_path);

     (void) generate_normal_entry(false);

     return entry;

   }

 #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();

 }

 /**

  * Method entry for static native methods:

  *   int java.util.zip.CRC32.update(int crc, int b)

  */

 address InterpreterGenerator::generate_CRC32_update_entry() {

   if (UseCRC32Intrinsics) {

     address entry = __ pc();

     // rbx,: Method*

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

     // rdx: scratch

     // rdi: scratch

     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);

     // We don't generate local frame and don't align stack because

     // we call stub code and there is no safepoint on this path.

     // Load parameters

     const Register crc = rax;  // crc

     const Register val = rdx;  // source java byte value

     const Register tbl = rdi;  // scratch

     // Arguments are reversed on java expression stack

     __ movl(val, Address(rsp,   wordSize)); // byte value

     __ movl(crc, Address(rsp, 2*wordSize)); // Initial CRC

     __ lea(tbl, ExternalAddress(StubRoutines::crc_table_addr()));

     __ notl(crc); // ~crc

     __ update_byte_crc32(crc, val, tbl);

     __ notl(crc); // ~crc

     // result in rax

     // _areturn

     __ pop(rdi);                // get return address

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

     __ jmp(rdi);

     // generate a vanilla native entry as the slow path

     __ bind(slow_path);

     (void) generate_native_entry(false);

     return entry;

   }

   return generate_native_entry(false);

 }

 /**

  * Method entry for static native methods:

  *   int java.util.zip.CRC32.updateBytes(int crc, byte[] b, int off, int len)

  *   int java.util.zip.CRC32.updateByteBuffer(int crc, long buf, int off, int len)

  */

 address InterpreterGenerator::generate_CRC32_updateBytes_entry(AbstractInterpreter::MethodKind kind) {

   if (UseCRC32Intrinsics) {

     address entry = __ pc();

     // rbx,: Method*

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

     // rdx: scratch

     // rdi: scratch

     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);

     // We don't generate local frame and don't align stack because

     // we call stub code and there is no safepoint on this path.

     // Load parameters

     const Register crc = rax;  // crc

     const Register buf = rdx;  // source java byte array address

     const Register len = rdi;  // length

     // Arguments are reversed on java expression stack

     __ movl(len,   Address(rsp,   wordSize)); // Length

     // Calculate address of start element

     if (kind == Interpreter::java_util_zip_CRC32_updateByteBuffer) {

       __ movptr(buf, Address(rsp, 3*wordSize)); // long buf

       __ addptr(buf, Address(rsp, 2*wordSize)); // + offset

       __ movl(crc,   Address(rsp, 5*wordSize)); // Initial CRC

     } else {

       __ movptr(buf, Address(rsp, 3*wordSize)); // byte[] array

       __ addptr(buf, arrayOopDesc::base_offset_in_bytes(T_BYTE)); // + header size

       __ addptr(buf, Address(rsp, 2*wordSize)); // + offset

       __ movl(crc,   Address(rsp, 4*wordSize)); // Initial CRC

     }

     __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, StubRoutines::updateBytesCRC32()), crc, buf, len);

     // result in rax

     // _areturn

     __ pop(rdi);                // get return address

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

     __ jmp(rdi);

     // generate a vanilla native entry as the slow path

     __ bind(slow_path);

     (void) generate_native_entry(false);

     return entry;

   }

   return generate_native_entry(false);

 }

 //

 // Interpreter stub for calling a native method. (asm interpreter)

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

 // than the typical interpreter frame setup.

 //

 address InterpreterGenerator::generate_native_entry(bool synchronized) {

   // determine code generation flags

   bool inc_counter  = UseCompiler || CountCompiledCalls;

   // rbx,: Method*

   // rsi: sender sp

   // rsi: previous interpreter state (C++ interpreter) must preserve

   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());

   // get parameter size (always needed)

   __ movptr(rcx, constMethod);

   __ load_unsigned_short(rcx, size_of_parameters);

   // native calls don't need the stack size check since they have no expression stack

   // and the arguments are already on the stack and we only add a handful of words

   // to the stack

   // rbx,: Method*

   // rcx: size of parameters

   // rsi: sender sp

   __ pop(rax);                                       // get return address

   // for natives the size of locals is zero

   // compute beginning of parameters (rdi)

   __ lea(rdi, Address(rsp, rcx, Interpreter::stackElementScale(), -wordSize));

   // add 2 zero-initialized slots for native calls

   // NULL result handler

   __ push((int32_t)NULL_WORD);

   // NULL oop temp (mirror or jni oop result)

   __ push((int32_t)NULL_WORD);

   // initialize fixed part of activation frame

   generate_fixed_frame(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

   // 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.

   __ get_thread(rax);

   const Address do_not_unlock_if_synchronized(rax,

         in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()));

   __ movbool(do_not_unlock_if_synchronized, true);

   // 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

   __ get_thread(rax);

   __ movbool(do_not_unlock_if_synchronized, false);

   // check for synchronized methods

   // Must happen AFTER invocation_counter check and stack overflow check,

   // so method is not locked if overflows.

   //

   if (synchronized) {

     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

 #ifdef ASSERT

   { Label L;

     const Address monitor_block_top (rbp,

                  frame::interpreter_frame_monitor_block_top_offset * wordSize);

     __ movptr(rax, monitor_block_top);

     __ cmpptr(rax, rsp);

     __ jcc(Assembler::equal, L);

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

     __ bind(L);

   }

 #endif

   // jvmti/dtrace support

   __ notify_method_entry();

   // work registers

   const Register method = rbx;

   const Register thread = rdi;

   const Register t      = rcx;

   // allocate space for parameters

   __ get_method(method);

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

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

   __ shlptr(t, Interpreter::logStackElementSize);

   __ 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

   // get signature handler

   { 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);

     __ get_method(method);

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

     __ bind(L);

   }

   // call signature handler

   assert(InterpreterRuntime::SignatureHandlerGenerator::from() == rdi, "adjust this code");

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

   assert(InterpreterRuntime::SignatureHandlerGenerator::temp() == t  , "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.

   __ call(t);

   __ get_method(method);        // slow path call blows RBX on DevStudio 5.0

   // result handler is in rax,

   // set result handler

   __ movptr(Address(rbp, frame::interpreter_frame_result_handler_offset*wordSize), rax);

   // 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 frame

     __ movptr(Address(rbp, frame::interpreter_frame_oop_temp_offset * wordSize), t);

     // pass handle to mirror

     __ lea(t, Address(rbp, frame::interpreter_frame_oop_temp_offset * wordSize));

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

     __ bind(L);

   }

   // get native function entry point

   { Label L;

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

     ExternalAddress unsatisfied(SharedRuntime::native_method_throw_unsatisfied_link_error_entry());

     __ cmpptr(rax, unsatisfied.addr());

     __ jcc(Assembler::notEqual, L);

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

     __ get_method(method);

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

     __ bind(L);

   }

   // pass JNIEnv

   __ get_thread(thread);

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

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

   // set_last_Java_frame_before_call

   // 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());

   // change thread state

 #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

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

   __ call(rax);

   // result potentially in rdx:rax or ST0

   // Verify or restore cpu control state after JNI call

   __ restore_cpu_control_state_after_jni();

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

   // (if result handler is the T_FLOAT or T_DOUBLE handler, result must be in ST0 -

   // the check is necessary to avoid potential Intel FPU overflow problems by saving/restoring 'empty' FPU registers)

   // It is safe to do this push because state is _thread_in_native and return address will be found

   // via _last_native_pc and not via _last_jave_sp

   // NOTE: the order of theses push(es) is known to frame::interpreter_frame_result.

   // If the order changes or anything else is added to the stack the code in

   // interpreter_frame_result will have to be changed.

   { Label L;

     Label push_double;

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

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

     __ cmpptr(Address(rbp, (frame::interpreter_frame_oop_temp_offset + 1)*wordSize),

               float_handler.addr());

     __ jcc(Assembler::equal, push_double);

     __ cmpptr(Address(rbp, (frame::interpreter_frame_oop_temp_offset + 1)*wordSize),

               double_handler.addr());

     __ jcc(Assembler::notEqual, L);

     __ bind(push_double);

     __ push(dtos);

     __ bind(L);

   }

   __ push(ltos);

   // change thread state

   __ get_thread(thread);

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

   if(os::is_MP()) {

     if (UseMembar) {

       // Force this write out before the read below

       __ membar(Assembler::Membar_mask_bits(

            Assembler::LoadLoad | Assembler::LoadStore |

            Assembler::StoreLoad | Assembler::StoreStore));

     } else {

       // 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);

     }

   }

   if (AlwaysRestoreFPU) {

     //  Make sure the control word is correct.

     __ fldcw(ExternalAddress(StubRoutines::addr_fpu_cntrl_wrd_std()));

   }

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

   { Label Continue;

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

              SafepointSynchronize::_not_synchronized);

     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. So we do a runtime call

     // by hand.

     //

     __ push(thread);

     __ call(RuntimeAddress(CAST_FROM_FN_PTR(address,

                                             JavaThread::check_special_condition_for_native_trans)));

     __ increment(rsp, wordSize);

     __ get_thread(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()));

   __ movptr(Address(t, JNIHandleBlock::top_offset_in_bytes()), NULL_WORD);

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

   { Label L;

     Label no_oop, store_result;

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

     __ cmpptr(Address(rbp, frame::interpreter_frame_result_handler_offset*wordSize),

               handler.addr());

     __ jcc(Assembler::notEqual, no_oop);

     __ cmpptr(Address(rsp, 0), (int32_t)NULL_WORD);

     __ pop(ltos);

     __ testptr(rax, rax);

     __ jcc(Assembler::zero, store_result);

     // unbox

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

     __ bind(store_result);

     __ movptr(Address(rbp, (frame::interpreter_frame_oop_temp_offset)*wordSize), rax);

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

     __ push(ltos);

     __ 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);

    }

   // restore rsi to have legal interpreter frame,

   // i.e., bci == 0 <=> rsi == code_base()

   // Can't call_VM until bcp is within reasonable.

   __ get_method(method);      // method is junk from thread_in_native to now.

   __ movptr(rsi, Address(method,Method::const_offset()));   // get ConstMethod*

   __ lea(rsi, Address(rsi,ConstMethod::codes_offset()));    // get codebase

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

   { Label L;

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

     __ jcc(Assembler::zero, L);

     // Note: At some point we may want to unify this with the code used in call_VM_base();

     //       i.e., we should use the StubRoutines::forward_exception code. For now this

     //       doesn't work here because the rsp is not correctly set at this point.

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

     __ should_not_reach_here();

     __ 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;

       // 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.

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

       __ lea(rdx, monitor);                   // address of first monitor

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

     }

     __ bind(L);

   }

   // jvmti/dtrace 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

   __ pop(ltos);

   __ movptr(t, Address(rbp, frame::interpreter_frame_result_handler_offset*wordSize));

   __ call(t);

   // remove activation

   __ movptr(t, Address(rbp, frame::interpreter_frame_sender_sp_offset * wordSize)); // get sender sp

   __ leave();                                // remove frame anchor

   __ pop(rdi);                               // get return address

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

   __ jmp(rdi);

   if (inc_counter) {

     // Handle overflow of counter and compile method

     __ bind(invocation_counter_overflow);

     generate_counter_overflow(&continue_after_compile);

   }

   return entry_point;

 }

 //

 // Generic interpreted method entry to (asm) interpreter

 //

 address InterpreterGenerator::generate_normal_entry(bool synchronized) {

   // determine code generation flags

   bool inc_counter  = UseCompiler || CountCompiledCalls;

   // rbx,: Method*

   // rsi: sender sp

   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(rdx, ConstMethod::size_of_parameters_offset());

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

   // get parameter size (always needed)

   __ movptr(rdx, constMethod);

   __ load_unsigned_short(rcx, size_of_parameters);

   // rbx,: Method*

   // rcx: size of parameters

   // rsi: sender_sp (could differ from sp+wordSize if we were called via c2i )

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

   __ subl(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();

   // get return address

   __ pop(rax);

   // compute beginning of parameters (rdi)

   __ lea(rdi, Address(rsp, rcx, Interpreter::stackElementScale(), -wordSize));

   // rdx - # of additional locals

   // allocate space for locals

   // explicitly initialize locals

   {

     Label exit, loop;

     __ testl(rdx, rdx);

     __ 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);

   }

   // initialize fixed part of activation frame

   generate_fixed_frame(false);

   // make sure method is not native & not abstract

 #ifdef ASSERT

   __ movl(rax, access_flags);

   {

     Label L;

     __ testl(rax, JVM_ACC_NATIVE);

     __ jcc(Assembler::zero, L);

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

   // 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.

   __ get_thread(rax);

   const Address do_not_unlock_if_synchronized(rax,

         in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()));

   __ movbool(do_not_unlock_if_synchronized, true);

   __ profile_parameters_type(rax, rcx, rdx);

   // increment invocation count & check for overflow

   Label invocation_counter_overflow;

   Label profile_method;

   Label profile_method_continue;

   if (inc_counter) {

     generate_counter_incr(&invocation_counter_overflow, &profile_method, &profile_method_continue);

     if (ProfileInterpreter) {

       __ bind(profile_method_continue);

     }

   }

   Label continue_after_compile;

   __ bind(continue_after_compile);

   bang_stack_shadow_pages(false);

   // reset the _do_not_unlock_if_synchronized flag

   __ get_thread(rax);

   __ movbool(do_not_unlock_if_synchronized, false);

   // check for synchronized methods

   // Must happen AFTER invocation_counter check and stack overflow check,

   // so method is not locked if overflows.

   //

   if (synchronized) {

     // Allocate monitor and lock method

     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

 #ifdef ASSERT

   { Label L;

      const Address monitor_block_top (rbp,

                  frame::interpreter_frame_monitor_block_top_offset * wordSize);

     __ movptr(rax, monitor_block_top);

     __ cmpptr(rax, rsp);

     __ jcc(Assembler::equal, L);

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

     __ bind(L);

   }

 #endif

   // jvmti support

   __ notify_method_entry();

   __ dispatch_next(vtos);

   // invocation counter overflow

   if (inc_counter) {

     if (ProfileInterpreter) {

       // We have decided to profile this method in the interpreter

       __ bind(profile_method);

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

       __ set_method_data_pointer_for_bcp();

       __ get_method(rbx);

       __ jmp(profile_method_continue);

     }

     // Handle overflow of counter and compile method

     __ bind(invocation_counter_overflow);

     generate_counter_overflow(&continue_after_compile);

   }

   return entry_point;

 }

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

 // Entry points

 //

 // Here we generate the various kind of entries into the interpreter.

 // The two main entry type are generic bytecode methods and native call method.

 // These both come in synchronized and non-synchronized versions but the

 // frame layout they create is very similar. The other method entry

 // types are really just special purpose entries that are really entry

 // and interpretation all in one. These are for trivial methods like

 // accessor, empty, or special math methods.

 //

 // When control flow reaches any of the entry types for the interpreter

 // the following holds ->

 //

 // Arguments:

 //

 // rbx,: Method*

 // rcx: receiver

 //

 //

 // Stack layout immediately at entry

 //

 // [ return address     ] <--- rsp

 // [ parameter n        ]

 //   ...

 // [ parameter 1        ]

 // [ expression stack   ] (caller's java expression stack)

 // Assuming that we don't go to one of the trivial specialized

 // entries the stack will look like below when we are ready to execute

 // the first bytecode (or call the native routine). The register usage

 // will be as the template based interpreter expects (see interpreter_x86.hpp).

 //

 // local variables follow incoming parameters immediately; i.e.

 // the return address is moved to the end of the locals).

 //

 // [ monitor entry      ] <--- rsp

 //   ...

 // [ monitor entry      ]

 // [ expr. stack bottom ]

 // [ saved rsi          ]

 // [ current rdi        ]

 // [ Method*            ]

 // [ saved rbp,          ] <--- rbp,

 // [ return address     ]

 // [ local variable m   ]

 //   ...

 // [ local variable 1   ]

 // [ parameter n        ]

 //   ...

 // [ parameter 1        ] <--- rdi

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

   // determine code generation flags

   bool synchronized = false;

   address entry_point = NULL;

   InterpreterGenerator* ig_this = (InterpreterGenerator*)this;

   switch (kind) {

     case Interpreter::zerolocals             :                                                       break;

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

     case Interpreter::native                 : entry_point = ig_this->generate_native_entry(false);  break;

     case Interpreter::native_synchronized    : entry_point = ig_this->generate_native_entry(true);   break;

     case Interpreter::empty                  : entry_point = ig_this->generate_empty_entry();        break;

     case Interpreter::accessor               : entry_point = ig_this->generate_accessor_entry();     break;

     case Interpreter::abstract               : entry_point = ig_this->generate_abstract_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    : // fall thru

     case Interpreter::java_lang_math_pow     : // fall thru

     case Interpreter::java_lang_math_exp     : entry_point = ig_this->generate_math_entry(kind);      break;

     case Interpreter::java_lang_ref_reference_get

                                              : entry_point = ig_this->generate_Reference_get_entry(); break;

     case Interpreter::java_util_zip_CRC32_update

                                              : entry_point = ig_this->generate_CRC32_update_entry();  break;

     case Interpreter::java_util_zip_CRC32_updateBytes

                                              : // fall thru

     case Interpreter::java_util_zip_CRC32_updateByteBuffer

                                              : entry_point = ig_this->generate_CRC32_updateBytes_entry(kind); break;

     default:

       fatal(err_msg("unexpected method kind: %d", kind));

       break;

   }

   if (entry_point) return entry_point;

   return ig_this->generate_normal_entry(synchronized);

 }

 // These should never be compiled since the interpreter will prefer

 // the compiled version to the intrinsic version.

 bool AbstractInterpreter::can_be_compiled(methodHandle m) {

   switch (method_kind(m)) {

     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    : // fall thru

     case Interpreter::java_lang_math_pow     : // fall thru

     case Interpreter::java_lang_math_exp     :

       return false;

     default:

       return true;

   }

 }

 // 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 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 = -frame::interpreter_frame_initial_sp_offset;

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

                            Interpreter::stackElementWords;

   return overhead_size + method_stack + stub_code;

 }

 // asm based interpreter deoptimization helpers

 int 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) {

   // Note: This calculation must exactly parallel the frame setup

   // in AbstractInterpreterGenerator::generate_method_entry.

   // If interpreter_frame!=NULL, set up the method, locals, and monitors.

   // The frame interpreter_frame, if not NULL, is guaranteed to be the right size,

   // as determined by a previous call to this method.

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

   // NOTE: return size is in words not bytes

   // fixed size of an interpreter frame:

   int max_locals = method->max_locals() * Interpreter::stackElementWords;

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

                      Interpreter::stackElementWords;

   int overhead = frame::sender_sp_offset - frame::interpreter_frame_initial_sp_offset;

   // Our locals were accounted for by the caller (or last_frame_adjust on the transistion)

   // Since the callee parameters already account for the callee's params we only need to account for

   // the extra locals.

   int size = overhead +

          ((callee_locals - callee_param_count)*Interpreter::stackElementWords) +

          (moncount*frame::interpreter_frame_monitor_size()) +

          tempcount*Interpreter::stackElementWords + popframe_extra_args;

   if (interpreter_frame != NULL) {

 #ifdef ASSERT

     if (!EnableInvokeDynamic)

       // @@@ FIXME: Should we correct interpreter_frame_sender_sp in the calling sequences?

       // Probably, since deoptimization doesn't work yet.

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

     assert(caller->sp() == interpreter_frame->sender_sp(), "Frame not properly walkable(2)");

 #endif

     interpreter_frame->interpreter_frame_set_method(method);

     // NOTE the difference in using sender_sp and interpreter_frame_sender_sp

     // interpreter_frame_sender_sp is the original sp of the caller (the unextended_sp)

     // and sender_sp is fp+8

     intptr_t* locals = interpreter_frame->sender_sp() + max_locals - 1;

 #ifdef ASSERT

     if (caller->is_interpreted_frame()) {

       assert(locals < caller->fp() + frame::interpreter_frame_initial_sp_offset, "bad placement");

     }

 #endif

     interpreter_frame->interpreter_frame_set_locals(locals);

     BasicObjectLock* montop = interpreter_frame->interpreter_frame_monitor_begin();

     BasicObjectLock* monbot = montop - moncount;

     interpreter_frame->interpreter_frame_set_monitor_end(monbot);

     // Set last_sp

     intptr_t*  rsp = (intptr_t*) monbot  -

                      tempcount*Interpreter::stackElementWords -

                      popframe_extra_args;

     interpreter_frame->interpreter_frame_set_last_sp(rsp);

     // All frames but the initial (oldest) interpreter frame we fill in have a

     // value for sender_sp that allows walking the stack but isn't

     // truly correct. Correct the value here.

     if (extra_locals != 0 &&

         interpreter_frame->sender_sp() == interpreter_frame->interpreter_frame_sender_sp() ) {

       interpreter_frame->set_interpreter_frame_sender_sp(caller->sp() + extra_locals);

     }

     *interpreter_frame->interpreter_frame_cache_addr() =

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

   }

   return size;

 }

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

 // Exceptions

 void TemplateInterpreterGenerator::generate_throw_exception() {

   // Entry point in previous activation (i.e., if the caller was interpreted)

   Interpreter::_rethrow_exception_entry = __ pc();

   const Register thread = rcx;

   // Restore sp to interpreter_frame_last_sp even though we are going

   // to empty the expression stack for the exception processing.

   __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), NULL_WORD);

   // rax,: exception

   // rdx: return address/pc that threw exception

   __ restore_bcp();                              // rsi points to call/send

   __ restore_locals();

   // Entry point for exceptions thrown within interpreter code

   Interpreter::_throw_exception_entry = __ pc();

   // expression stack is undefined here

   // rax,: exception

   // rsi: exception bcp

   __ verify_oop(rax);

   // expression stack must be empty before entering the VM in case of an exception

   __ empty_expression_stack();

   __ empty_FPU_stack();

   // find exception handler address and preserve exception oop

   __ call_VM(rdx, CAST_FROM_FN_PTR(address, InterpreterRuntime::exception_handler_for_exception), rax);

   // rax,: exception handler entry point

   // rdx: preserved exception oop

   // rsi: bcp for exception handler

   __ push_ptr(rdx);                              // push exception which is now the only value on the stack

   __ jmp(rax);                                   // jump to exception handler (may be _remove_activation_entry!)

   // If the exception is not handled in the current frame the frame is removed and

   // the exception is rethrown (i.e. exception continuation is _rethrow_exception).

   //

   // Note: At this point the bci is still the bxi for the instruction which caused

   //       the exception and the expression stack is empty. Thus, for any VM calls

   //       at this point, GC will find a legal oop map (with empty expression stack).

   // In current activation

   // tos: exception

   // rsi: exception bcp

   //

   // JVMTI PopFrame support

   //

    Interpreter::_remove_activation_preserving_args_entry = __ pc();

   __ empty_expression_stack();

   __ empty_FPU_stack();

   // Set the popframe_processing bit in pending_popframe_condition indicating that we are

   // currently handling popframe, so that call_VMs that may happen later do not trigger new

   // popframe handling cycles.

   __ get_thread(thread);

   __ movl(rdx, Address(thread, JavaThread::popframe_condition_offset()));

   __ orl(rdx, JavaThread::popframe_processing_bit);

   __ movl(Address(thread, JavaThread::popframe_condition_offset()), rdx);

   {

     // Check to see whether we are returning to a deoptimized frame.

     // (The PopFrame call ensures that the caller of the popped frame is

     // either interpreted or compiled and deoptimizes it if compiled.)

     // In this case, we can't call dispatch_next() after the frame is

     // popped, but instead must save the incoming arguments and restore

     // them after deoptimization has occurred.

     //

     // Note that we don't compare the return PC against the

     // deoptimization blob's unpack entry because of the presence of

     // adapter frames in C2.

     Label caller_not_deoptimized;

     __ movptr(rdx, Address(rbp, frame::return_addr_offset * wordSize));

     __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::interpreter_contains), rdx);

     __ testl(rax, rax);

     __ jcc(Assembler::notZero, caller_not_deoptimized);

     // Compute size of arguments for saving when returning to deoptimized caller

     __ get_method(rax);

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

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

     __ shlptr(rax, Interpreter::logStackElementSize);

     __ restore_locals();

     __ subptr(rdi, rax);

     __ addptr(rdi, wordSize);

     // Save these arguments

     __ get_thread(thread);

     __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::popframe_preserve_args), thread, rax, rdi);

     __ remove_activation(vtos, rdx,

                          /* throw_monitor_exception */ false,

                          /* install_monitor_exception */ false,

                          /* notify_jvmdi */ false);

     // Inform deoptimization that it is responsible for restoring these arguments

     __ get_thread(thread);

     __ movl(Address(thread, JavaThread::popframe_condition_offset()), JavaThread::popframe_force_deopt_reexecution_bit);

     // Continue in deoptimization handler

     __ jmp(rdx);

     __ bind(caller_not_deoptimized);

   }

   __ remove_activation(vtos, rdx,

                        /* throw_monitor_exception */ false,

                        /* install_monitor_exception */ false,

                        /* notify_jvmdi */ false);

   // Finish with popframe handling

   // A previous I2C followed by a deoptimization might have moved the

   // outgoing arguments further up the stack. PopFrame expects the

   // mutations to those outgoing arguments to be preserved and other

   // constraints basically require this frame to look exactly as

   // though it had previously invoked an interpreted activation with

   // no space between the top of the expression stack (current

   // last_sp) and the top of stack. Rather than force deopt to

   // maintain this kind of invariant all the time we call a small

   // fixup routine to move the mutated arguments onto the top of our

   // expression stack if necessary.

   __ mov(rax, rsp);

   __ movptr(rbx, Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize));

   __ get_thread(thread);

   // PC must point into interpreter here

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

   __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::popframe_move_outgoing_args), thread, rax, rbx);

   __ get_thread(thread);

   __ reset_last_Java_frame(thread, true, true);

   // Restore the last_sp and null it out

   __ movptr(rsp, Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize));

   __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), NULL_WORD);

   __ restore_bcp();

   __ restore_locals();

   // The method data pointer was incremented already during

   // call profiling. We have to restore the mdp for the current bcp.

   if (ProfileInterpreter) {

     __ set_method_data_pointer_for_bcp();

   }

   // Clear the popframe condition flag

   __ get_thread(thread);

   __ movl(Address(thread, JavaThread::popframe_condition_offset()), JavaThread::popframe_inactive);

 #if INCLUDE_JVMTI

   if (EnableInvokeDynamic) {

     Label L_done;

     const Register local0 = rdi;

     __ cmpb(Address(rsi, 0), Bytecodes::_invokestatic);

     __ jcc(Assembler::notEqual, L_done);

     // The member name argument must be restored if _invokestatic is re-executed after a PopFrame call.

     // Detect such a case in the InterpreterRuntime function and return the member name argument, or NULL.

     __ get_method(rdx);

     __ movptr(rax, Address(local0, 0));

     __ call_VM(rax, CAST_FROM_FN_PTR(address, InterpreterRuntime::member_name_arg_or_null), rax, rdx, rsi);

     __ testptr(rax, rax);

     __ jcc(Assembler::zero, L_done);

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

     __ bind(L_done);

   }

 #endif // INCLUDE_JVMTI

   __ dispatch_next(vtos);

   // end of PopFrame support

   Interpreter::_remove_activation_entry = __ pc();

   // preserve exception over this code sequence

   __ pop_ptr(rax);

   __ get_thread(thread);

   __ movptr(Address(thread, JavaThread::vm_result_offset()), rax);

   // remove the activation (without doing throws on illegalMonitorExceptions)

   __ remove_activation(vtos, rdx, false, true, false);

   // restore exception

   __ get_thread(thread);

   __ get_vm_result(rax, thread);

   // Inbetween activations - previous activation type unknown yet

   // compute continuation point - the continuation point expects

   // the following registers set up:

   //

   // rax: exception

   // rdx: return address/pc that threw exception

   // rsp: expression stack of caller

   // rbp: rbp, of caller

   __ push(rax);                                  // save exception

   __ push(rdx);                                  // save return address

   __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), thread, rdx);

   __ mov(rbx, rax);                              // save exception handler

   __ pop(rdx);                                   // restore return address

   __ pop(rax);                                   // restore exception

   // Note that an "issuing PC" is actually the next PC after the call

   __ jmp(rbx);                                   // jump to exception handler of caller

 }

 //

 // JVMTI ForceEarlyReturn support

 //

 address TemplateInterpreterGenerator::generate_earlyret_entry_for(TosState state) {

   address entry = __ pc();

   const Register thread = rcx;

   __ restore_bcp();

   __ restore_locals();

   __ empty_expression_stack();

   __ empty_FPU_stack();

   __ load_earlyret_value(state);

   __ get_thread(thread);

   __ movptr(rcx, Address(thread, JavaThread::jvmti_thread_state_offset()));

   const Address cond_addr(rcx, JvmtiThreadState::earlyret_state_offset());

   // Clear the earlyret state

   __ movl(cond_addr, JvmtiThreadState::earlyret_inactive);

   __ remove_activation(state, rsi,

                        false, /* throw_monitor_exception */

                        false, /* install_monitor_exception */

                        true); /* notify_jvmdi */

   __ jmp(rsi);

   return entry;

 } // end of ForceEarlyReturn support

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

 // Helper for vtos entry point generation

 void TemplateInterpreterGenerator::set_vtos_entry_points (Template* t, address& bep, address& cep, address& sep, address& aep, address& iep, address& lep, address& fep, address& dep, address& vep) {

   assert(t->is_valid() && t->tos_in() == vtos, "illegal template");

   Label L;

   fep = __ pc(); __ push(ftos); __ jmp(L);

   dep = __ pc(); __ push(dtos); __ jmp(L);

   lep = __ pc(); __ push(ltos); __ jmp(L);

   aep = __ pc(); __ push(atos); __ jmp(L);

   bep = cep = sep =             // fall through

   iep = __ pc(); __ push(itos); // fall through

   vep = __ pc(); __ bind(L);    // fall through

   generate_and_dispatch(t);

 }

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

 // Generation of individual instructions

 // helpers for generate_and_dispatch

 InterpreterGenerator::InterpreterGenerator(StubQueue* code)

  : TemplateInterpreterGenerator(code) {

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

 }

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

 // Non-product code

 #ifndef PRODUCT

 address TemplateInterpreterGenerator::generate_trace_code(TosState state) {

   address entry = __ pc();

   // prepare expression stack

   __ pop(rcx);          // pop return address so expression stack is 'pure'

   __ push(state);       // save tosca

   // pass tosca registers as arguments & call tracer

   __ call_VM(noreg, CAST_FROM_FN_PTR(address, SharedRuntime::trace_bytecode), rcx, rax, rdx);

   __ mov(rcx, rax);     // make sure return address is not destroyed by pop(state)

   __ pop(state);        // restore tosca

   // return

   __ jmp(rcx);

   return entry;

 }

 void TemplateInterpreterGenerator::count_bytecode() {

   __ incrementl(ExternalAddress((address) &BytecodeCounter::_counter_value));

 }

 void TemplateInterpreterGenerator::histogram_bytecode(Template* t) {

   __ incrementl(ExternalAddress((address) &BytecodeHistogram::_counters[t->bytecode()]));

 }

 void TemplateInterpreterGenerator::histogram_bytecode_pair(Template* t) {

   __ mov32(ExternalAddress((address) &BytecodePairHistogram::_index), rbx);

   __ shrl(rbx, BytecodePairHistogram::log2_number_of_codes);

   __ orl(rbx, ((int)t->bytecode()) << BytecodePairHistogram::log2_number_of_codes);

   ExternalAddress table((address) BytecodePairHistogram::_counters);

   Address index(noreg, rbx, Address::times_4);

   __ incrementl(ArrayAddress(table, index));

 }

 void TemplateInterpreterGenerator::trace_bytecode(Template* t) {

   // Call a little run-time stub to avoid blow-up for each bytecode.

   // The run-time runtime saves the right registers, depending on

   // the tosca in-state for the given template.

   assert(Interpreter::trace_code(t->tos_in()) != NULL,

          "entry must have been generated");

   __ call(RuntimeAddress(Interpreter::trace_code(t->tos_in())));

 }

 void TemplateInterpreterGenerator::stop_interpreter_at() {

   Label L;

   __ cmp32(ExternalAddress((address) &BytecodeCounter::_counter_value),

            StopInterpreterAt);

   __ jcc(Assembler::notEqual, L);

   __ int3();

   __ bind(L);

 }

 #endif // !PRODUCT

 #endif // CC_INTERP