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 /*

  * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.

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

  *

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

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

  * published by the Free Software Foundation.

  *

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

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

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

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

  * accompanied this code).

  *

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

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

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

  *

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

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

  * questions.

  *

  */

 #include "precompiled.hpp"

 #include "interpreter/interpreter.hpp"

 #include "memory/allocation.inline.hpp"

 #include "prims/methodHandles.hpp"

 #define __ _masm->

 #ifdef PRODUCT

 #define BLOCK_COMMENT(str) /* nothing */

 #else

 #define BLOCK_COMMENT(str) __ block_comment(str)

 #endif

 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")

 address MethodHandleEntry::start_compiled_entry(MacroAssembler* _masm,

                                                 address interpreted_entry) {

   // Just before the actual machine code entry point, allocate space

   // for a MethodHandleEntry::Data record, so that we can manage everything

   // from one base pointer.

   __ align(wordSize);

   address target = __ pc() + sizeof(Data);

   while (__ pc() < target) {

     __ nop();

     __ align(wordSize);

   }

   MethodHandleEntry* me = (MethodHandleEntry*) __ pc();

   me->set_end_address(__ pc());         // set a temporary end_address

   me->set_from_interpreted_entry(interpreted_entry);

   me->set_type_checking_entry(NULL);

   return (address) me;

 }

 MethodHandleEntry* MethodHandleEntry::finish_compiled_entry(MacroAssembler* _masm,

                                                 address start_addr) {

   MethodHandleEntry* me = (MethodHandleEntry*) start_addr;

   assert(me->end_address() == start_addr, "valid ME");

   // Fill in the real end_address:

   __ align(wordSize);

   me->set_end_address(__ pc());

   return me;

 }

 #ifdef ASSERT

 static void verify_argslot(MacroAssembler* _masm, Register argslot_reg,

                            const char* error_message) {

   // Verify that argslot lies within (rsp, rbp].

   Label L_ok, L_bad;

   BLOCK_COMMENT("{ verify_argslot");

   __ cmpptr(argslot_reg, rbp);

   __ jccb(Assembler::above, L_bad);

   __ cmpptr(rsp, argslot_reg);

   __ jccb(Assembler::below, L_ok);

   __ bind(L_bad);

   __ stop(error_message);

   __ bind(L_ok);

   BLOCK_COMMENT("} verify_argslot");

 }

 #endif

 // Code generation

 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm) {

   // rbx: methodOop

   // rcx: receiver method handle (must load from sp[MethodTypeForm.vmslots])

   // rsi/r13: sender SP (must preserve; see prepare_to_jump_from_interpreted)

   // rdx, rdi: garbage temp, blown away

   Register rbx_method = rbx;

   Register rcx_recv   = rcx;

   Register rax_mtype  = rax;

   Register rdx_temp   = rdx;

   Register rdi_temp   = rdi;

   // emit WrongMethodType path first, to enable jccb back-branch from main path

   Label wrong_method_type;

   __ bind(wrong_method_type);

   Label invoke_generic_slow_path;

   assert(methodOopDesc::intrinsic_id_size_in_bytes() == sizeof(u1), "");;

   __ cmpb(Address(rbx_method, methodOopDesc::intrinsic_id_offset_in_bytes()), (int) vmIntrinsics::_invokeExact);

   __ jcc(Assembler::notEqual, invoke_generic_slow_path);

   __ push(rax_mtype);       // required mtype

   __ push(rcx_recv);        // bad mh (1st stacked argument)

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

   // here's where control starts out:

   __ align(CodeEntryAlignment);

   address entry_point = __ pc();

   // fetch the MethodType from the method handle into rax (the 'check' register)

   {

     Register tem = rbx_method;

     for (jint* pchase = methodOopDesc::method_type_offsets_chain(); (*pchase) != -1; pchase++) {

       __ movptr(rax_mtype, Address(tem, *pchase));

       tem = rax_mtype;          // in case there is another indirection

     }

   }

   // given the MethodType, find out where the MH argument is buried

   __ load_heap_oop(rdx_temp, Address(rax_mtype, __ delayed_value(java_dyn_MethodType::form_offset_in_bytes, rdi_temp)));

   Register rdx_vmslots = rdx_temp;

   __ movl(rdx_vmslots, Address(rdx_temp, __ delayed_value(java_dyn_MethodTypeForm::vmslots_offset_in_bytes, rdi_temp)));

   __ movptr(rcx_recv, __ argument_address(rdx_vmslots));

   trace_method_handle(_masm, "invokeExact");

   __ check_method_handle_type(rax_mtype, rcx_recv, rdi_temp, wrong_method_type);

   __ jump_to_method_handle_entry(rcx_recv, rdi_temp);

   // for invokeGeneric (only), apply argument and result conversions on the fly

   __ bind(invoke_generic_slow_path);

 #ifdef ASSERT

   { Label L;

     __ cmpb(Address(rbx_method, methodOopDesc::intrinsic_id_offset_in_bytes()), (int) vmIntrinsics::_invokeGeneric);

     __ jcc(Assembler::equal, L);

     __ stop("bad methodOop::intrinsic_id");

     __ bind(L);

   }

 #endif //ASSERT

   Register rbx_temp = rbx_method;  // don't need it now

   // make room on the stack for another pointer:

   Register rcx_argslot = rcx_recv;

   __ lea(rcx_argslot, __ argument_address(rdx_vmslots, 1));

   insert_arg_slots(_masm, 2 * stack_move_unit(), _INSERT_REF_MASK,

                    rcx_argslot, rbx_temp, rdx_temp);

   // load up an adapter from the calling type (Java weaves this)

   __ load_heap_oop(rdx_temp, Address(rax_mtype, __ delayed_value(java_dyn_MethodType::form_offset_in_bytes, rdi_temp)));

   Register rdx_adapter = rdx_temp;

   // __ load_heap_oop(rdx_adapter, Address(rdx_temp, java_dyn_MethodTypeForm::genericInvoker_offset_in_bytes()));

   // deal with old JDK versions:

   __ lea(rdi_temp, Address(rdx_temp, __ delayed_value(java_dyn_MethodTypeForm::genericInvoker_offset_in_bytes, rdi_temp)));

   __ cmpptr(rdi_temp, rdx_temp);

   Label sorry_no_invoke_generic;

   __ jcc(Assembler::below, sorry_no_invoke_generic);

   __ load_heap_oop(rdx_adapter, Address(rdi_temp, 0));

   __ testptr(rdx_adapter, rdx_adapter);

   __ jcc(Assembler::zero, sorry_no_invoke_generic);

   __ movptr(Address(rcx_argslot, 1 * Interpreter::stackElementSize), rdx_adapter);

   // As a trusted first argument, pass the type being called, so the adapter knows

   // the actual types of the arguments and return values.

   // (Generic invokers are shared among form-families of method-type.)

   __ movptr(Address(rcx_argslot, 0 * Interpreter::stackElementSize), rax_mtype);

   // FIXME: assert that rdx_adapter is of the right method-type.

   __ mov(rcx, rdx_adapter);

   trace_method_handle(_masm, "invokeGeneric");

   __ jump_to_method_handle_entry(rcx, rdi_temp);

   __ bind(sorry_no_invoke_generic); // no invokeGeneric implementation available!

   __ movptr(rcx_recv, Address(rcx_argslot, -1 * Interpreter::stackElementSize));  // recover original MH

   __ push(rax_mtype);       // required mtype

   __ push(rcx_recv);        // bad mh (1st stacked argument)

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

   return entry_point;

 }

 // Helper to insert argument slots into the stack.

 // arg_slots must be a multiple of stack_move_unit() and <= 0

 void MethodHandles::insert_arg_slots(MacroAssembler* _masm,

                                      RegisterOrConstant arg_slots,

                                      int arg_mask,

                                      Register rax_argslot,

                                      Register rbx_temp, Register rdx_temp, Register temp3_reg) {

   assert(temp3_reg == noreg, "temp3 not required");

   assert_different_registers(rax_argslot, rbx_temp, rdx_temp,

                              (!arg_slots.is_register() ? rsp : arg_slots.as_register()));

 #ifdef ASSERT

   verify_argslot(_masm, rax_argslot, "insertion point must fall within current frame");

   if (arg_slots.is_register()) {

     Label L_ok, L_bad;

     __ cmpptr(arg_slots.as_register(), (int32_t) NULL_WORD);

     __ jccb(Assembler::greater, L_bad);

     __ testl(arg_slots.as_register(), -stack_move_unit() - 1);

     __ jccb(Assembler::zero, L_ok);

     __ bind(L_bad);

     __ stop("assert arg_slots <= 0 and clear low bits");

     __ bind(L_ok);

   } else {

     assert(arg_slots.as_constant() <= 0, "");

     assert(arg_slots.as_constant() % -stack_move_unit() == 0, "");

   }

 #endif //ASSERT

 #ifdef _LP64

   if (arg_slots.is_register()) {

     // clean high bits of stack motion register (was loaded as an int)

     __ movslq(arg_slots.as_register(), arg_slots.as_register());

   }

 #endif

   // Make space on the stack for the inserted argument(s).

   // Then pull down everything shallower than rax_argslot.

   // The stacked return address gets pulled down with everything else.

   // That is, copy [rsp, argslot) downward by -size words.  In pseudo-code:

   //   rsp -= size;

   //   for (rdx = rsp + size; rdx < argslot; rdx++)

   //     rdx[-size] = rdx[0]

   //   argslot -= size;

   BLOCK_COMMENT("insert_arg_slots {");

   __ mov(rdx_temp, rsp);                        // source pointer for copy

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

   {

     Label loop;

     __ BIND(loop);

     // pull one word down each time through the loop

     __ movptr(rbx_temp, Address(rdx_temp, 0));

     __ movptr(Address(rdx_temp, arg_slots, Address::times_ptr), rbx_temp);

     __ addptr(rdx_temp, wordSize);

     __ cmpptr(rdx_temp, rax_argslot);

     __ jccb(Assembler::less, loop);

   }

   // Now move the argslot down, to point to the opened-up space.

   __ lea(rax_argslot, Address(rax_argslot, arg_slots, Address::times_ptr));

   BLOCK_COMMENT("} insert_arg_slots");

 }

 // Helper to remove argument slots from the stack.

 // arg_slots must be a multiple of stack_move_unit() and >= 0

 void MethodHandles::remove_arg_slots(MacroAssembler* _masm,

                                     RegisterOrConstant arg_slots,

                                     Register rax_argslot,

                                      Register rbx_temp, Register rdx_temp, Register temp3_reg) {

   assert(temp3_reg == noreg, "temp3 not required");

   assert_different_registers(rax_argslot, rbx_temp, rdx_temp,

                              (!arg_slots.is_register() ? rsp : arg_slots.as_register()));

 #ifdef ASSERT

   // Verify that [argslot..argslot+size) lies within (rsp, rbp).

   __ lea(rbx_temp, Address(rax_argslot, arg_slots, Address::times_ptr));

   verify_argslot(_masm, rbx_temp, "deleted argument(s) must fall within current frame");

   if (arg_slots.is_register()) {

     Label L_ok, L_bad;

     __ cmpptr(arg_slots.as_register(), (int32_t) NULL_WORD);

     __ jccb(Assembler::less, L_bad);

     __ testl(arg_slots.as_register(), -stack_move_unit() - 1);

     __ jccb(Assembler::zero, L_ok);

     __ bind(L_bad);

     __ stop("assert arg_slots >= 0 and clear low bits");

     __ bind(L_ok);

   } else {

     assert(arg_slots.as_constant() >= 0, "");

     assert(arg_slots.as_constant() % -stack_move_unit() == 0, "");

   }

 #endif //ASSERT

 #ifdef _LP64

   if (false) {                  // not needed, since register is positive

     // clean high bits of stack motion register (was loaded as an int)

     if (arg_slots.is_register())

       __ movslq(arg_slots.as_register(), arg_slots.as_register());

   }

 #endif

   BLOCK_COMMENT("remove_arg_slots {");

   // Pull up everything shallower than rax_argslot.

   // Then remove the excess space on the stack.

   // The stacked return address gets pulled up with everything else.

   // That is, copy [rsp, argslot) upward by size words.  In pseudo-code:

   //   for (rdx = argslot-1; rdx >= rsp; --rdx)

   //     rdx[size] = rdx[0]

   //   argslot += size;

   //   rsp += size;

   __ lea(rdx_temp, Address(rax_argslot, -wordSize)); // source pointer for copy

   {

     Label loop;

     __ BIND(loop);

     // pull one word up each time through the loop

     __ movptr(rbx_temp, Address(rdx_temp, 0));

     __ movptr(Address(rdx_temp, arg_slots, Address::times_ptr), rbx_temp);

     __ addptr(rdx_temp, -wordSize);

     __ cmpptr(rdx_temp, rsp);

     __ jccb(Assembler::greaterEqual, loop);

   }

   // Now move the argslot up, to point to the just-copied block.

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

   // And adjust the argslot address to point at the deletion point.

   __ lea(rax_argslot, Address(rax_argslot, arg_slots, Address::times_ptr));

   BLOCK_COMMENT("} remove_arg_slots");

 }

 #ifndef PRODUCT

 extern "C" void print_method_handle(oop mh);

 void trace_method_handle_stub(const char* adaptername,

                               oop mh,

                               intptr_t* saved_regs,

                               intptr_t* entry_sp,

                               intptr_t* saved_sp,

                               intptr_t* saved_bp) {

   // called as a leaf from native code: do not block the JVM!

   intptr_t* last_sp = (intptr_t*) saved_bp[frame::interpreter_frame_last_sp_offset];

   intptr_t* base_sp = (intptr_t*) saved_bp[frame::interpreter_frame_monitor_block_top_offset];

   printf("MH %s mh="INTPTR_FORMAT" sp=("INTPTR_FORMAT"+"INTX_FORMAT") stack_size="INTX_FORMAT" bp="INTPTR_FORMAT"\n",

          adaptername, (intptr_t)mh, (intptr_t)entry_sp, (intptr_t)(saved_sp - entry_sp), (intptr_t)(base_sp - last_sp), (intptr_t)saved_bp);

   if (last_sp != saved_sp && last_sp != NULL)

     printf("*** last_sp="INTPTR_FORMAT"\n", (intptr_t)last_sp);

   if (Verbose) {

     printf(" reg dump: ");

     int saved_regs_count = (entry_sp-1) - saved_regs;

     // 32 bit: rdi rsi rbp rsp; rbx rdx rcx (*) rax

     int i;

     for (i = 0; i <= saved_regs_count; i++) {

       if (i > 0 && i % 4 == 0 && i != saved_regs_count)

         printf("\n   + dump: ");

       printf(" %d: "INTPTR_FORMAT, i, saved_regs[i]);

     }

     printf("\n");

     int stack_dump_count = 16;

     if (stack_dump_count < (int)(saved_bp + 2 - saved_sp))

       stack_dump_count = (int)(saved_bp + 2 - saved_sp);

     if (stack_dump_count > 64)  stack_dump_count = 48;

     for (i = 0; i < stack_dump_count; i += 4) {

       printf(" dump at SP[%d] "INTPTR_FORMAT": "INTPTR_FORMAT" "INTPTR_FORMAT" "INTPTR_FORMAT" "INTPTR_FORMAT"\n",

              i, (intptr_t) &entry_sp[i+0], entry_sp[i+0], entry_sp[i+1], entry_sp[i+2], entry_sp[i+3]);

     }

     print_method_handle(mh);

   }

 }

 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {

   if (!TraceMethodHandles)  return;

   BLOCK_COMMENT("trace_method_handle {");

   __ push(rax);

   __ lea(rax, Address(rsp, wordSize*6)); // entry_sp

   __ pusha();

   // arguments:

   __ push(rbp);               // interpreter frame pointer

   __ push(rsi);               // saved_sp

   __ push(rax);               // entry_sp

   __ push(rcx);               // mh

   __ push(rcx);

   __ movptr(Address(rsp, 0), (intptr_t) adaptername);

   __ call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub), 5);

   __ popa();

   __ pop(rax);

   BLOCK_COMMENT("} trace_method_handle");

 }

 #endif //PRODUCT

 // which conversion op types are implemented here?

 int MethodHandles::adapter_conversion_ops_supported_mask() {

   return ((1<<sun_dyn_AdapterMethodHandle::OP_RETYPE_ONLY)

          |(1<<sun_dyn_AdapterMethodHandle::OP_RETYPE_RAW)

          |(1<<sun_dyn_AdapterMethodHandle::OP_CHECK_CAST)

          |(1<<sun_dyn_AdapterMethodHandle::OP_PRIM_TO_PRIM)

          |(1<<sun_dyn_AdapterMethodHandle::OP_REF_TO_PRIM)

          |(1<<sun_dyn_AdapterMethodHandle::OP_SWAP_ARGS)

          |(1<<sun_dyn_AdapterMethodHandle::OP_ROT_ARGS)

          |(1<<sun_dyn_AdapterMethodHandle::OP_DUP_ARGS)

          |(1<<sun_dyn_AdapterMethodHandle::OP_DROP_ARGS)

          //|(1<<sun_dyn_AdapterMethodHandle::OP_SPREAD_ARGS) //BUG!

          );

   // FIXME: MethodHandlesTest gets a crash if we enable OP_SPREAD_ARGS.

 }

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

 // MethodHandles::generate_method_handle_stub

 //

 // Generate an "entry" field for a method handle.

 // This determines how the method handle will respond to calls.

 void MethodHandles::generate_method_handle_stub(MacroAssembler* _masm, MethodHandles::EntryKind ek) {

   // Here is the register state during an interpreted call,

   // as set up by generate_method_handle_interpreter_entry():

   // - rbx: garbage temp (was MethodHandle.invoke methodOop, unused)

   // - rcx: receiver method handle

   // - rax: method handle type (only used by the check_mtype entry point)

   // - rsi/r13: sender SP (must preserve; see prepare_to_jump_from_interpreted)

   // - rdx: garbage temp, can blow away

   const Register rcx_recv    = rcx;

   const Register rax_argslot = rax;

   const Register rbx_temp    = rbx;

   const Register rdx_temp    = rdx;

   // This guy is set up by prepare_to_jump_from_interpreted (from interpreted calls)

   // and gen_c2i_adapter (from compiled calls):

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

   // Argument registers for _raise_exception.

   // 32-bit: Pass first two oop/int args in registers ECX and EDX.

   const Register rarg0_code     = LP64_ONLY(j_rarg0) NOT_LP64(rcx);

   const Register rarg1_actual   = LP64_ONLY(j_rarg1) NOT_LP64(rdx);

   const Register rarg2_required = LP64_ONLY(j_rarg2) NOT_LP64(rdi);

   assert_different_registers(rarg0_code, rarg1_actual, rarg2_required, saved_last_sp);

   guarantee(java_dyn_MethodHandle::vmentry_offset_in_bytes() != 0, "must have offsets");

   // some handy addresses

   Address rbx_method_fie(     rbx,      methodOopDesc::from_interpreted_offset() );

   Address rcx_mh_vmtarget(    rcx_recv, java_dyn_MethodHandle::vmtarget_offset_in_bytes() );

   Address rcx_dmh_vmindex(    rcx_recv, sun_dyn_DirectMethodHandle::vmindex_offset_in_bytes() );

   Address rcx_bmh_vmargslot(  rcx_recv, sun_dyn_BoundMethodHandle::vmargslot_offset_in_bytes() );

   Address rcx_bmh_argument(   rcx_recv, sun_dyn_BoundMethodHandle::argument_offset_in_bytes() );

   Address rcx_amh_vmargslot(  rcx_recv, sun_dyn_AdapterMethodHandle::vmargslot_offset_in_bytes() );

   Address rcx_amh_argument(   rcx_recv, sun_dyn_AdapterMethodHandle::argument_offset_in_bytes() );

   Address rcx_amh_conversion( rcx_recv, sun_dyn_AdapterMethodHandle::conversion_offset_in_bytes() );

   Address vmarg;                // __ argument_address(vmargslot)

   const int java_mirror_offset = klassOopDesc::klass_part_offset_in_bytes() + Klass::java_mirror_offset_in_bytes();

   if (have_entry(ek)) {

     __ nop();                   // empty stubs make SG sick

     return;

   }

   address interp_entry = __ pc();

   trace_method_handle(_masm, entry_name(ek));

   BLOCK_COMMENT(entry_name(ek));

   switch ((int) ek) {

   case _raise_exception:

     {

       // Not a real MH entry, but rather shared code for raising an

       // exception.  Since we use a C2I adapter to set up the

       // interpreter state, arguments are expected in compiler

       // argument registers.

       assert(raise_exception_method(), "must be set");

       address c2i_entry = raise_exception_method()->get_c2i_entry();

       assert(c2i_entry, "method must be linked");

       const Register rdi_pc = rax;

       __ pop(rdi_pc);  // caller PC

       __ mov(rsp, saved_last_sp);  // cut the stack back to where the caller started

       Register rbx_method = rbx_temp;

       Label L_no_method;

       // FIXME: fill in _raise_exception_method with a suitable sun.dyn method

       __ movptr(rbx_method, ExternalAddress((address) &_raise_exception_method));

       __ testptr(rbx_method, rbx_method);

       __ jccb(Assembler::zero, L_no_method);

       const int jobject_oop_offset = 0;

       __ movptr(rbx_method, Address(rbx_method, jobject_oop_offset));  // dereference the jobject

       __ testptr(rbx_method, rbx_method);

       __ jccb(Assembler::zero, L_no_method);

       __ verify_oop(rbx_method);

       // 32-bit: push remaining arguments as if coming from the compiler.

       NOT_LP64(__ push(rarg2_required));

       __ push(rdi_pc);  // restore caller PC

       __ jump(ExternalAddress(c2i_entry));  // do C2I transition

       // If we get here, the Java runtime did not do its job of creating the exception.

       // Do something that is at least causes a valid throw from the interpreter.

       __ bind(L_no_method);

       __ push(rarg2_required);

       __ push(rarg1_actual);

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

     }

     break;

   case _invokestatic_mh:

   case _invokespecial_mh:

     {

       Register rbx_method = rbx_temp;

       __ load_heap_oop(rbx_method, rcx_mh_vmtarget); // target is a methodOop

       __ verify_oop(rbx_method);

       // same as TemplateTable::invokestatic or invokespecial,

       // minus the CP setup and profiling:

       if (ek == _invokespecial_mh) {

         // Must load & check the first argument before entering the target method.

         __ load_method_handle_vmslots(rax_argslot, rcx_recv, rdx_temp);

         __ movptr(rcx_recv, __ argument_address(rax_argslot, -1));

         __ null_check(rcx_recv);

         __ verify_oop(rcx_recv);

       }

       __ jmp(rbx_method_fie);

     }

     break;

   case _invokevirtual_mh:

     {

       // same as TemplateTable::invokevirtual,

       // minus the CP setup and profiling:

       // pick out the vtable index and receiver offset from the MH,

       // and then we can discard it:

       __ load_method_handle_vmslots(rax_argslot, rcx_recv, rdx_temp);

       Register rbx_index = rbx_temp;

       __ movl(rbx_index, rcx_dmh_vmindex);

       // Note:  The verifier allows us to ignore rcx_mh_vmtarget.

       __ movptr(rcx_recv, __ argument_address(rax_argslot, -1));

       __ null_check(rcx_recv, oopDesc::klass_offset_in_bytes());

       // get receiver klass

       Register rax_klass = rax_argslot;

       __ load_klass(rax_klass, rcx_recv);

       __ verify_oop(rax_klass);

       // get target methodOop & entry point

       const int base = instanceKlass::vtable_start_offset() * wordSize;

       assert(vtableEntry::size() * wordSize == wordSize, "adjust the scaling in the code below");

       Address vtable_entry_addr(rax_klass,

                                 rbx_index, Address::times_ptr,

                                 base + vtableEntry::method_offset_in_bytes());

       Register rbx_method = rbx_temp;

       __ movptr(rbx_method, vtable_entry_addr);

       __ verify_oop(rbx_method);

       __ jmp(rbx_method_fie);

     }

     break;

   case _invokeinterface_mh:

     {

       // same as TemplateTable::invokeinterface,

       // minus the CP setup and profiling:

       // pick out the interface and itable index from the MH.

       __ load_method_handle_vmslots(rax_argslot, rcx_recv, rdx_temp);

       Register rdx_intf  = rdx_temp;

       Register rbx_index = rbx_temp;

       __ load_heap_oop(rdx_intf, rcx_mh_vmtarget);

       __ movl(rbx_index, rcx_dmh_vmindex);

       __ movptr(rcx_recv, __ argument_address(rax_argslot, -1));

       __ null_check(rcx_recv, oopDesc::klass_offset_in_bytes());

       // get receiver klass

       Register rax_klass = rax_argslot;

       __ load_klass(rax_klass, rcx_recv);

       __ verify_oop(rax_klass);

       Register rdi_temp   = rdi;

       Register rbx_method = rbx_index;

       // get interface klass

       Label no_such_interface;

       __ verify_oop(rdx_intf);

       __ lookup_interface_method(rax_klass, rdx_intf,

                                  // note: next two args must be the same:

                                  rbx_index, rbx_method,

                                  rdi_temp,

                                  no_such_interface);

       __ verify_oop(rbx_method);

       __ jmp(rbx_method_fie);

       __ hlt();

       __ bind(no_such_interface);

       // Throw an exception.

       // For historical reasons, it will be IncompatibleClassChangeError.

       __ mov(rbx_temp, rcx_recv);  // rarg2_required might be RCX

       assert_different_registers(rarg2_required, rbx_temp);

       __ movptr(rarg2_required, Address(rdx_intf, java_mirror_offset));  // required interface

       __ mov(   rarg1_actual,   rbx_temp);                               // bad receiver

       __ movl(  rarg0_code,     (int) Bytecodes::_invokeinterface);      // who is complaining?

       __ jump(ExternalAddress(from_interpreted_entry(_raise_exception)));

     }

     break;

   case _bound_ref_mh:

   case _bound_int_mh:

   case _bound_long_mh:

   case _bound_ref_direct_mh:

   case _bound_int_direct_mh:

   case _bound_long_direct_mh:

     {

       bool direct_to_method = (ek >= _bound_ref_direct_mh);

       BasicType arg_type  = T_ILLEGAL;

       int       arg_mask  = _INSERT_NO_MASK;

       int       arg_slots = -1;

       get_ek_bound_mh_info(ek, arg_type, arg_mask, arg_slots);

       // make room for the new argument:

       __ movl(rax_argslot, rcx_bmh_vmargslot);

       __ lea(rax_argslot, __ argument_address(rax_argslot));

       insert_arg_slots(_masm, arg_slots * stack_move_unit(), arg_mask,

                        rax_argslot, rbx_temp, rdx_temp);

       // store bound argument into the new stack slot:

       __ load_heap_oop(rbx_temp, rcx_bmh_argument);

       Address prim_value_addr(rbx_temp, java_lang_boxing_object::value_offset_in_bytes(arg_type));

       if (arg_type == T_OBJECT) {

         __ movptr(Address(rax_argslot, 0), rbx_temp);

       } else {

         __ load_sized_value(rdx_temp, prim_value_addr,

                             type2aelembytes(arg_type), is_signed_subword_type(arg_type));

         __ movptr(Address(rax_argslot, 0), rdx_temp);

 #ifndef _LP64

         if (arg_slots == 2) {

           __ movl(rdx_temp, prim_value_addr.plus_disp(wordSize));

           __ movl(Address(rax_argslot, Interpreter::stackElementSize), rdx_temp);

         }

 #endif //_LP64

       }

       if (direct_to_method) {

         Register rbx_method = rbx_temp;

         __ load_heap_oop(rbx_method, rcx_mh_vmtarget);

         __ verify_oop(rbx_method);

         __ jmp(rbx_method_fie);

       } else {

         __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);

         __ verify_oop(rcx_recv);

         __ jump_to_method_handle_entry(rcx_recv, rdx_temp);

       }

     }

     break;

   case _adapter_retype_only:

   case _adapter_retype_raw:

     // immediately jump to the next MH layer:

     __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);

     __ verify_oop(rcx_recv);

     __ jump_to_method_handle_entry(rcx_recv, rdx_temp);

     // This is OK when all parameter types widen.

     // It is also OK when a return type narrows.

     break;

   case _adapter_check_cast:

     {

       // temps:

       Register rbx_klass = rbx_temp; // interesting AMH data

       // check a reference argument before jumping to the next layer of MH:

       __ movl(rax_argslot, rcx_amh_vmargslot);

       vmarg = __ argument_address(rax_argslot);

       // What class are we casting to?

       __ load_heap_oop(rbx_klass, rcx_amh_argument); // this is a Class object!

       __ load_heap_oop(rbx_klass, Address(rbx_klass, java_lang_Class::klass_offset_in_bytes()));

       Label done;

       __ movptr(rdx_temp, vmarg);

       __ testptr(rdx_temp, rdx_temp);

       __ jcc(Assembler::zero, done);         // no cast if null

       __ load_klass(rdx_temp, rdx_temp);

       // live at this point:

       // - rbx_klass:  klass required by the target method

       // - rdx_temp:   argument klass to test

       // - rcx_recv:   adapter method handle

       __ check_klass_subtype(rdx_temp, rbx_klass, rax_argslot, done);

       // If we get here, the type check failed!

       // Call the wrong_method_type stub, passing the failing argument type in rax.

       Register rax_mtype = rax_argslot;

       __ movl(rax_argslot, rcx_amh_vmargslot);  // reload argslot field

       __ movptr(rdx_temp, vmarg);

       assert_different_registers(rarg2_required, rdx_temp);

       __ load_heap_oop(rarg2_required, rcx_amh_argument);             // required class

       __ mov(          rarg1_actual,   rdx_temp);                     // bad object

       __ movl(         rarg0_code,     (int) Bytecodes::_checkcast);  // who is complaining?

       __ jump(ExternalAddress(from_interpreted_entry(_raise_exception)));

       __ bind(done);

       // get the new MH:

       __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);

       __ jump_to_method_handle_entry(rcx_recv, rdx_temp);

     }

     break;

   case _adapter_prim_to_prim:

   case _adapter_ref_to_prim:

     // handled completely by optimized cases

     __ stop("init_AdapterMethodHandle should not issue this");

     break;

   case _adapter_opt_i2i:        // optimized subcase of adapt_prim_to_prim

 //case _adapter_opt_f2i:        // optimized subcase of adapt_prim_to_prim

   case _adapter_opt_l2i:        // optimized subcase of adapt_prim_to_prim

   case _adapter_opt_unboxi:     // optimized subcase of adapt_ref_to_prim

     {

       // perform an in-place conversion to int or an int subword

       __ movl(rax_argslot, rcx_amh_vmargslot);

       vmarg = __ argument_address(rax_argslot);

       switch (ek) {

       case _adapter_opt_i2i:

         __ movl(rdx_temp, vmarg);

         break;

       case _adapter_opt_l2i:

         {

           // just delete the extra slot; on a little-endian machine we keep the first

           __ lea(rax_argslot, __ argument_address(rax_argslot, 1));

           remove_arg_slots(_masm, -stack_move_unit(),

                            rax_argslot, rbx_temp, rdx_temp);

           vmarg = Address(rax_argslot, -Interpreter::stackElementSize);

           __ movl(rdx_temp, vmarg);

         }

         break;

       case _adapter_opt_unboxi:

         {

           // Load the value up from the heap.

           __ movptr(rdx_temp, vmarg);

           int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_INT);

 #ifdef ASSERT

           for (int bt = T_BOOLEAN; bt < T_INT; bt++) {

             if (is_subword_type(BasicType(bt)))

               assert(value_offset == java_lang_boxing_object::value_offset_in_bytes(BasicType(bt)), "");

           }

 #endif

           __ null_check(rdx_temp, value_offset);

           __ movl(rdx_temp, Address(rdx_temp, value_offset));

           // We load this as a word.  Because we are little-endian,

           // the low bits will be correct, but the high bits may need cleaning.

           // The vminfo will guide us to clean those bits.

         }

         break;

       default:

         ShouldNotReachHere();

       }

       // Do the requested conversion and store the value.

       Register rbx_vminfo = rbx_temp;

       __ movl(rbx_vminfo, rcx_amh_conversion);

       assert(CONV_VMINFO_SHIFT == 0, "preshifted");

       // get the new MH:

       __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);

       // (now we are done with the old MH)

       // original 32-bit vmdata word must be of this form:

       //    | MBZ:6 | signBitCount:8 | srcDstTypes:8 | conversionOp:8 |

       __ xchgptr(rcx, rbx_vminfo);                // free rcx for shifts

       __ shll(rdx_temp /*, rcx*/);

       Label zero_extend, done;

       __ testl(rcx, CONV_VMINFO_SIGN_FLAG);

       __ jccb(Assembler::zero, zero_extend);

       // this path is taken for int->byte, int->short

       __ sarl(rdx_temp /*, rcx*/);

       __ jmpb(done);

       __ bind(zero_extend);

       // this is taken for int->char

       __ shrl(rdx_temp /*, rcx*/);

       __ bind(done);

       __ movl(vmarg, rdx_temp);  // Store the value.

       __ xchgptr(rcx, rbx_vminfo);                // restore rcx_recv

       __ jump_to_method_handle_entry(rcx_recv, rdx_temp);

     }

     break;

   case _adapter_opt_i2l:        // optimized subcase of adapt_prim_to_prim

   case _adapter_opt_unboxl:     // optimized subcase of adapt_ref_to_prim

     {

       // perform an in-place int-to-long or ref-to-long conversion

       __ movl(rax_argslot, rcx_amh_vmargslot);

       // on a little-endian machine we keep the first slot and add another after

       __ lea(rax_argslot, __ argument_address(rax_argslot, 1));

       insert_arg_slots(_masm, stack_move_unit(), _INSERT_INT_MASK,

                        rax_argslot, rbx_temp, rdx_temp);

       Address vmarg1(rax_argslot, -Interpreter::stackElementSize);

       Address vmarg2 = vmarg1.plus_disp(Interpreter::stackElementSize);

       switch (ek) {

       case _adapter_opt_i2l:

         {

 #ifdef _LP64

           __ movslq(rdx_temp, vmarg1);  // Load sign-extended

           __ movq(vmarg1, rdx_temp);    // Store into first slot

 #else

           __ movl(rdx_temp, vmarg1);

           __ sarl(rdx_temp, BitsPerInt - 1);  // __ extend_sign()

           __ movl(vmarg2, rdx_temp); // store second word

 #endif

         }

         break;

       case _adapter_opt_unboxl:

         {

           // Load the value up from the heap.

           __ movptr(rdx_temp, vmarg1);

           int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_LONG);

           assert(value_offset == java_lang_boxing_object::value_offset_in_bytes(T_DOUBLE), "");

           __ null_check(rdx_temp, value_offset);

 #ifdef _LP64

           __ movq(rbx_temp, Address(rdx_temp, value_offset));

           __ movq(vmarg1, rbx_temp);

 #else

           __ movl(rbx_temp, Address(rdx_temp, value_offset + 0*BytesPerInt));

           __ movl(rdx_temp, Address(rdx_temp, value_offset + 1*BytesPerInt));

           __ movl(vmarg1, rbx_temp);

           __ movl(vmarg2, rdx_temp);

 #endif

         }

         break;

       default:

         ShouldNotReachHere();

       }

       __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);

       __ jump_to_method_handle_entry(rcx_recv, rdx_temp);

     }

     break;

   case _adapter_opt_f2d:        // optimized subcase of adapt_prim_to_prim

   case _adapter_opt_d2f:        // optimized subcase of adapt_prim_to_prim

     {

       // perform an in-place floating primitive conversion

       __ movl(rax_argslot, rcx_amh_vmargslot);

       __ lea(rax_argslot, __ argument_address(rax_argslot, 1));

       if (ek == _adapter_opt_f2d) {

         insert_arg_slots(_masm, stack_move_unit(), _INSERT_INT_MASK,

                          rax_argslot, rbx_temp, rdx_temp);

       }

       Address vmarg(rax_argslot, -Interpreter::stackElementSize);

 #ifdef _LP64

       if (ek == _adapter_opt_f2d) {

         __ movflt(xmm0, vmarg);

         __ cvtss2sd(xmm0, xmm0);

         __ movdbl(vmarg, xmm0);

       } else {

         __ movdbl(xmm0, vmarg);

         __ cvtsd2ss(xmm0, xmm0);

         __ movflt(vmarg, xmm0);

       }

 #else //_LP64

       if (ek == _adapter_opt_f2d) {

         __ fld_s(vmarg);        // load float to ST0

         __ fstp_s(vmarg);       // store single

       } else {

         __ fld_d(vmarg);        // load double to ST0

         __ fstp_s(vmarg);       // store single

       }

 #endif //_LP64

       if (ek == _adapter_opt_d2f) {

         remove_arg_slots(_masm, -stack_move_unit(),

                          rax_argslot, rbx_temp, rdx_temp);

       }

       __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);

       __ jump_to_method_handle_entry(rcx_recv, rdx_temp);

     }

     break;

   case _adapter_prim_to_ref:

     __ unimplemented(entry_name(ek)); // %%% FIXME: NYI

     break;

   case _adapter_swap_args:

   case _adapter_rot_args:

     // handled completely by optimized cases

     __ stop("init_AdapterMethodHandle should not issue this");

     break;

   case _adapter_opt_swap_1:

   case _adapter_opt_swap_2:

   case _adapter_opt_rot_1_up:

   case _adapter_opt_rot_1_down:

   case _adapter_opt_rot_2_up:

   case _adapter_opt_rot_2_down:

     {

       int swap_bytes = 0, rotate = 0;

       get_ek_adapter_opt_swap_rot_info(ek, swap_bytes, rotate);

       // 'argslot' is the position of the first argument to swap

       __ movl(rax_argslot, rcx_amh_vmargslot);

       __ lea(rax_argslot, __ argument_address(rax_argslot));

       // 'vminfo' is the second

       Register rbx_destslot = rbx_temp;

       __ movl(rbx_destslot, rcx_amh_conversion);

       assert(CONV_VMINFO_SHIFT == 0, "preshifted");

       __ andl(rbx_destslot, CONV_VMINFO_MASK);

       __ lea(rbx_destslot, __ argument_address(rbx_destslot));

       DEBUG_ONLY(verify_argslot(_masm, rbx_destslot, "swap point must fall within current frame"));

       if (!rotate) {

         for (int i = 0; i < swap_bytes; i += wordSize) {

           __ movptr(rdx_temp, Address(rax_argslot , i));

           __ push(rdx_temp);

           __ movptr(rdx_temp, Address(rbx_destslot, i));

           __ movptr(Address(rax_argslot, i), rdx_temp);

           __ pop(rdx_temp);

           __ movptr(Address(rbx_destslot, i), rdx_temp);

         }

       } else {

         // push the first chunk, which is going to get overwritten

         for (int i = swap_bytes; (i -= wordSize) >= 0; ) {

           __ movptr(rdx_temp, Address(rax_argslot, i));

           __ push(rdx_temp);

         }

         if (rotate > 0) {

           // rotate upward

           __ subptr(rax_argslot, swap_bytes);

 #ifdef ASSERT

           {

             // Verify that argslot > destslot, by at least swap_bytes.

             Label L_ok;

             __ cmpptr(rax_argslot, rbx_destslot);

             __ jccb(Assembler::aboveEqual, L_ok);

             __ stop("source must be above destination (upward rotation)");

             __ bind(L_ok);

           }

 #endif

           // work argslot down to destslot, copying contiguous data upwards

           // pseudo-code:

           //   rax = src_addr - swap_bytes

           //   rbx = dest_addr

           //   while (rax >= rbx) *(rax + swap_bytes) = *(rax + 0), rax--;

           Label loop;

           __ bind(loop);

           __ movptr(rdx_temp, Address(rax_argslot, 0));

           __ movptr(Address(rax_argslot, swap_bytes), rdx_temp);

           __ addptr(rax_argslot, -wordSize);

           __ cmpptr(rax_argslot, rbx_destslot);

           __ jccb(Assembler::aboveEqual, loop);

         } else {

           __ addptr(rax_argslot, swap_bytes);

 #ifdef ASSERT

           {

             // Verify that argslot < destslot, by at least swap_bytes.

             Label L_ok;

             __ cmpptr(rax_argslot, rbx_destslot);

             __ jccb(Assembler::belowEqual, L_ok);

             __ stop("source must be below destination (downward rotation)");

             __ bind(L_ok);

           }

 #endif

           // work argslot up to destslot, copying contiguous data downwards

           // pseudo-code:

           //   rax = src_addr + swap_bytes

           //   rbx = dest_addr

           //   while (rax <= rbx) *(rax - swap_bytes) = *(rax + 0), rax++;

           Label loop;

           __ bind(loop);

           __ movptr(rdx_temp, Address(rax_argslot, 0));

           __ movptr(Address(rax_argslot, -swap_bytes), rdx_temp);

           __ addptr(rax_argslot, wordSize);

           __ cmpptr(rax_argslot, rbx_destslot);

           __ jccb(Assembler::belowEqual, loop);

         }

         // pop the original first chunk into the destination slot, now free

         for (int i = 0; i < swap_bytes; i += wordSize) {

           __ pop(rdx_temp);

           __ movptr(Address(rbx_destslot, i), rdx_temp);

         }

       }

       __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);

       __ jump_to_method_handle_entry(rcx_recv, rdx_temp);

     }

     break;

   case _adapter_dup_args:

     {

       // 'argslot' is the position of the first argument to duplicate

       __ movl(rax_argslot, rcx_amh_vmargslot);

       __ lea(rax_argslot, __ argument_address(rax_argslot));

       // 'stack_move' is negative number of words to duplicate

       Register rdx_stack_move = rdx_temp;

       __ movl2ptr(rdx_stack_move, rcx_amh_conversion);

       __ sarptr(rdx_stack_move, CONV_STACK_MOVE_SHIFT);

       int argslot0_num = 0;

       Address argslot0 = __ argument_address(RegisterOrConstant(argslot0_num));

       assert(argslot0.base() == rsp, "");

       int pre_arg_size = argslot0.disp();

       assert(pre_arg_size % wordSize == 0, "");

       assert(pre_arg_size > 0, "must include PC");

       // remember the old rsp+1 (argslot[0])

       Register rbx_oldarg = rbx_temp;

       __ lea(rbx_oldarg, argslot0);

       // move rsp down to make room for dups

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

       // compute the new rsp+1 (argslot[0])

       Register rdx_newarg = rdx_temp;

       __ lea(rdx_newarg, argslot0);

       __ push(rdi);             // need a temp

       // (preceding push must be done after arg addresses are taken!)

       // pull down the pre_arg_size data (PC)

       for (int i = -pre_arg_size; i < 0; i += wordSize) {

         __ movptr(rdi, Address(rbx_oldarg, i));

         __ movptr(Address(rdx_newarg, i), rdi);

       }

       // copy from rax_argslot[0...] down to new_rsp[1...]

       // pseudo-code:

       //   rbx = old_rsp+1

       //   rdx = new_rsp+1

       //   rax = argslot

       //   while (rdx < rbx) *rdx++ = *rax++

       Label loop;

       __ bind(loop);

       __ movptr(rdi, Address(rax_argslot, 0));

       __ movptr(Address(rdx_newarg, 0), rdi);

       __ addptr(rax_argslot, wordSize);

       __ addptr(rdx_newarg, wordSize);

       __ cmpptr(rdx_newarg, rbx_oldarg);

       __ jccb(Assembler::less, loop);

       __ pop(rdi);              // restore temp

       __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);

       __ jump_to_method_handle_entry(rcx_recv, rdx_temp);

     }

     break;

   case _adapter_drop_args:

     {

       // 'argslot' is the position of the first argument to nuke

       __ movl(rax_argslot, rcx_amh_vmargslot);

       __ lea(rax_argslot, __ argument_address(rax_argslot));

       __ push(rdi);             // need a temp

       // (must do previous push after argslot address is taken)

       // 'stack_move' is number of words to drop

       Register rdi_stack_move = rdi;

       __ movl2ptr(rdi_stack_move, rcx_amh_conversion);

       __ sarptr(rdi_stack_move, CONV_STACK_MOVE_SHIFT);

       remove_arg_slots(_masm, rdi_stack_move,

                        rax_argslot, rbx_temp, rdx_temp);

       __ pop(rdi);              // restore temp

       __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);

       __ jump_to_method_handle_entry(rcx_recv, rdx_temp);

     }

     break;

   case _adapter_collect_args:

     __ unimplemented(entry_name(ek)); // %%% FIXME: NYI

     break;

   case _adapter_spread_args:

     // handled completely by optimized cases

     __ stop("init_AdapterMethodHandle should not issue this");

     break;

   case _adapter_opt_spread_0:

   case _adapter_opt_spread_1:

   case _adapter_opt_spread_more:

     {

       // spread an array out into a group of arguments

       int length_constant = get_ek_adapter_opt_spread_info(ek);

       // find the address of the array argument

       __ movl(rax_argslot, rcx_amh_vmargslot);

       __ lea(rax_argslot, __ argument_address(rax_argslot));

       // grab some temps

       { __ push(rsi); __ push(rdi); }

       // (preceding pushes must be done after argslot address is taken!)

 #define UNPUSH_RSI_RDI \

       { __ pop(rdi); __ pop(rsi); }

       // arx_argslot points both to the array and to the first output arg

       vmarg = Address(rax_argslot, 0);

       // Get the array value.

       Register  rsi_array       = rsi;

       Register  rdx_array_klass = rdx_temp;

       BasicType elem_type       = T_OBJECT;

       int       length_offset   = arrayOopDesc::length_offset_in_bytes();

       int       elem0_offset    = arrayOopDesc::base_offset_in_bytes(elem_type);

       __ movptr(rsi_array, vmarg);

       Label skip_array_check;

       if (length_constant == 0) {

         __ testptr(rsi_array, rsi_array);

         __ jcc(Assembler::zero, skip_array_check);

       }

       __ null_check(rsi_array, oopDesc::klass_offset_in_bytes());

       __ load_klass(rdx_array_klass, rsi_array);

       // Check the array type.

       Register rbx_klass = rbx_temp;

       __ load_heap_oop(rbx_klass, rcx_amh_argument); // this is a Class object!

       __ load_heap_oop(rbx_klass, Address(rbx_klass, java_lang_Class::klass_offset_in_bytes()));

       Label ok_array_klass, bad_array_klass, bad_array_length;

       __ check_klass_subtype(rdx_array_klass, rbx_klass, rdi, ok_array_klass);

       // If we get here, the type check failed!

       __ jmp(bad_array_klass);

       __ bind(ok_array_klass);

       // Check length.

       if (length_constant >= 0) {

         __ cmpl(Address(rsi_array, length_offset), length_constant);

       } else {

         Register rbx_vminfo = rbx_temp;

         __ movl(rbx_vminfo, rcx_amh_conversion);

         assert(CONV_VMINFO_SHIFT == 0, "preshifted");

         __ andl(rbx_vminfo, CONV_VMINFO_MASK);

         __ cmpl(rbx_vminfo, Address(rsi_array, length_offset));

       }

       __ jcc(Assembler::notEqual, bad_array_length);

       Register rdx_argslot_limit = rdx_temp;

       // Array length checks out.  Now insert any required stack slots.

       if (length_constant == -1) {

         // Form a pointer to the end of the affected region.

         __ lea(rdx_argslot_limit, Address(rax_argslot, Interpreter::stackElementSize));

         // 'stack_move' is negative number of words to insert

         Register rdi_stack_move = rdi;

         __ movl2ptr(rdi_stack_move, rcx_amh_conversion);

         __ sarptr(rdi_stack_move, CONV_STACK_MOVE_SHIFT);

         Register rsi_temp = rsi_array;  // spill this

         insert_arg_slots(_masm, rdi_stack_move, -1,

                          rax_argslot, rbx_temp, rsi_temp);

         // reload the array (since rsi was killed)

         __ movptr(rsi_array, vmarg);

       } else if (length_constant > 1) {

         int arg_mask = 0;

         int new_slots = (length_constant - 1);

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

           arg_mask <<= 1;

           arg_mask |= _INSERT_REF_MASK;

         }

         insert_arg_slots(_masm, new_slots * stack_move_unit(), arg_mask,

                          rax_argslot, rbx_temp, rdx_temp);

       } else if (length_constant == 1) {

         // no stack resizing required

       } else if (length_constant == 0) {

         remove_arg_slots(_masm, -stack_move_unit(),

                          rax_argslot, rbx_temp, rdx_temp);

       }

       // Copy from the array to the new slots.

       // Note: Stack change code preserves integrity of rax_argslot pointer.

       // So even after slot insertions, rax_argslot still points to first argument.

       if (length_constant == -1) {

         // [rax_argslot, rdx_argslot_limit) is the area we are inserting into.

         Register rsi_source = rsi_array;

         __ lea(rsi_source, Address(rsi_array, elem0_offset));

         Label loop;

         __ bind(loop);

         __ movptr(rbx_temp, Address(rsi_source, 0));

         __ movptr(Address(rax_argslot, 0), rbx_temp);

         __ addptr(rsi_source, type2aelembytes(elem_type));

         __ addptr(rax_argslot, Interpreter::stackElementSize);

         __ cmpptr(rax_argslot, rdx_argslot_limit);

         __ jccb(Assembler::less, loop);

       } else if (length_constant == 0) {

         __ bind(skip_array_check);

         // nothing to copy

       } else {

         int elem_offset = elem0_offset;

         int slot_offset = 0;

         for (int index = 0; index < length_constant; index++) {

           __ movptr(rbx_temp, Address(rsi_array, elem_offset));

           __ movptr(Address(rax_argslot, slot_offset), rbx_temp);

           elem_offset += type2aelembytes(elem_type);

            slot_offset += Interpreter::stackElementSize;

         }

       }

       // Arguments are spread.  Move to next method handle.

       UNPUSH_RSI_RDI;

       __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);

       __ jump_to_method_handle_entry(rcx_recv, rdx_temp);

       __ bind(bad_array_klass);

       UNPUSH_RSI_RDI;

       assert(!vmarg.uses(rarg2_required), "must be different registers");

       __ movptr(rarg2_required, Address(rdx_array_klass, java_mirror_offset));  // required type

       __ movptr(rarg1_actual,   vmarg);                                         // bad array

       __ movl(  rarg0_code,     (int) Bytecodes::_aaload);                      // who is complaining?

       __ jump(ExternalAddress(from_interpreted_entry(_raise_exception)));

       __ bind(bad_array_length);

       UNPUSH_RSI_RDI;

       assert(!vmarg.uses(rarg2_required), "must be different registers");

       __ mov   (rarg2_required, rcx_recv);                       // AMH requiring a certain length

       __ movptr(rarg1_actual,   vmarg);                          // bad array

       __ movl(  rarg0_code,     (int) Bytecodes::_arraylength);  // who is complaining?

       __ jump(ExternalAddress(from_interpreted_entry(_raise_exception)));

 #undef UNPUSH_RSI_RDI

     }

     break;

   case _adapter_flyby:

   case _adapter_ricochet:

     __ unimplemented(entry_name(ek)); // %%% FIXME: NYI

     break;

   default:  ShouldNotReachHere();

   }

   __ hlt();

   address me_cookie = MethodHandleEntry::start_compiled_entry(_masm, interp_entry);

   __ unimplemented(entry_name(ek)); // %%% FIXME: NYI

   init_entry(ek, MethodHandleEntry::finish_compiled_entry(_masm, me_cookie));

 }