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

 /*

  * Copyright (c) 2008, 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.

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  */

 #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;

 }

 // stack walking support

 frame MethodHandles::ricochet_frame_sender(const frame& fr, RegisterMap *map) {

   //RicochetFrame* f = RicochetFrame::from_frame(fr);

   // Cf. is_interpreted_frame path of frame::sender

   intptr_t* younger_sp = fr.sp();

   intptr_t* sp         = fr.sender_sp();

   map->make_integer_regs_unsaved();

   map->shift_window(sp, younger_sp);

   bool this_frame_adjusted_stack = true;  // I5_savedSP is live in this RF

   return frame(sp, younger_sp, this_frame_adjusted_stack);

 }

 void MethodHandles::ricochet_frame_oops_do(const frame& fr, OopClosure* blk, const RegisterMap* reg_map) {

   ResourceMark rm;

   RicochetFrame* f = RicochetFrame::from_frame(fr);

   // pick up the argument type descriptor:

   Thread* thread = Thread::current();

   Handle cookie(thread, f->compute_saved_args_layout(true, true));

   // process fixed part

   blk->do_oop((oop*)f->saved_target_addr());

   blk->do_oop((oop*)f->saved_args_layout_addr());

   // process variable arguments:

   if (cookie.is_null())  return;  // no arguments to describe

   // the cookie is actually the invokeExact method for my target

   // his argument signature is what I'm interested in

   assert(cookie->is_method(), "");

   methodHandle invoker(thread, methodOop(cookie()));

   assert(invoker->name() == vmSymbols::invokeExact_name(), "must be this kind of method");

   assert(!invoker->is_static(), "must have MH argument");

   int slot_count = invoker->size_of_parameters();

   assert(slot_count >= 1, "must include 'this'");

   intptr_t* base = f->saved_args_base();

   intptr_t* retval = NULL;

   if (f->has_return_value_slot())

     retval = f->return_value_slot_addr();

   int slot_num = slot_count - 1;

   intptr_t* loc = &base[slot_num];

   //blk->do_oop((oop*) loc);   // original target, which is irrelevant

   int arg_num = 0;

   for (SignatureStream ss(invoker->signature()); !ss.is_done(); ss.next()) {

     if (ss.at_return_type())  continue;

     BasicType ptype = ss.type();

     if (ptype == T_ARRAY)  ptype = T_OBJECT; // fold all refs to T_OBJECT

     assert(ptype >= T_BOOLEAN && ptype <= T_OBJECT, "not array or void");

     slot_num -= type2size[ptype];

     loc = &base[slot_num];

     bool is_oop = (ptype == T_OBJECT && loc != retval);

     if (is_oop)  blk->do_oop((oop*)loc);

     arg_num += 1;

   }

   assert(slot_num == 0, "must have processed all the arguments");

 }

 // Ricochet Frames

 const Register MethodHandles::RicochetFrame::L1_continuation      = L1;

 const Register MethodHandles::RicochetFrame::L2_saved_target      = L2;

 const Register MethodHandles::RicochetFrame::L3_saved_args_layout = L3;

 const Register MethodHandles::RicochetFrame::L4_saved_args_base   = L4; // cf. Gargs = G4

 const Register MethodHandles::RicochetFrame::L5_conversion        = L5;

 #ifdef ASSERT

 const Register MethodHandles::RicochetFrame::L0_magic_number_1    = L0;

 #endif //ASSERT

 oop MethodHandles::RicochetFrame::compute_saved_args_layout(bool read_cache, bool write_cache) {

   if (read_cache) {

     oop cookie = saved_args_layout();

     if (cookie != NULL)  return cookie;

   }

   oop target = saved_target();

   oop mtype  = java_lang_invoke_MethodHandle::type(target);

   oop mtform = java_lang_invoke_MethodType::form(mtype);

   oop cookie = java_lang_invoke_MethodTypeForm::vmlayout(mtform);

   if (write_cache)  {

     (*saved_args_layout_addr()) = cookie;

   }

   return cookie;

 }

 void MethodHandles::RicochetFrame::generate_ricochet_blob(MacroAssembler* _masm,

                                                           // output params:

                                                           int* bounce_offset,

                                                           int* exception_offset,

                                                           int* frame_size_in_words) {

   (*frame_size_in_words) = RicochetFrame::frame_size_in_bytes() / wordSize;

   address start = __ pc();

 #ifdef ASSERT

   __ illtrap(0); __ illtrap(0); __ illtrap(0);

   // here's a hint of something special:

   __ set(MAGIC_NUMBER_1, G0);

   __ set(MAGIC_NUMBER_2, G0);

 #endif //ASSERT

   __ illtrap(0);  // not reached

   // Return values are in registers.

   // L1_continuation contains a cleanup continuation we must return

   // to.

   (*bounce_offset) = __ pc() - start;

   BLOCK_COMMENT("ricochet_blob.bounce");

   if (VerifyMethodHandles)  RicochetFrame::verify_clean(_masm);

   trace_method_handle(_masm, "ricochet_blob.bounce");

   __ JMP(L1_continuation, 0);

   __ delayed()->nop();

   __ illtrap(0);

   DEBUG_ONLY(__ set(MAGIC_NUMBER_2, G0));

   (*exception_offset) = __ pc() - start;

   BLOCK_COMMENT("ricochet_blob.exception");

   // compare this to Interpreter::rethrow_exception_entry, which is parallel code

   // for example, see TemplateInterpreterGenerator::generate_throw_exception

   // Live registers in:

   //   Oexception  (O0): exception

   //   Oissuing_pc (O1): return address/pc that threw exception (ignored, always equal to bounce addr)

   __ verify_oop(Oexception);

   // Take down the frame.

   // Cf. InterpreterMacroAssembler::remove_activation.

   leave_ricochet_frame(_masm, /*recv_reg=*/ noreg, I5_savedSP, I7);

   // We are done with this activation frame; find out where to go next.

   // The continuation point will be an exception handler, which expects

   // the following registers set up:

   //

   // Oexception: exception

   // Oissuing_pc: the local call that threw exception

   // Other On: garbage

   // In/Ln:  the contents of the caller's register window

   //

   // We do the required restore at the last possible moment, because we

   // need to preserve some state across a runtime call.

   // (Remember that the caller activation is unknown--it might not be

   // interpreted, so things like Lscratch are useless in the caller.)

   __ mov(Oexception,  Oexception ->after_save());  // get exception in I0 so it will be on O0 after restore

   __ add(I7, frame::pc_return_offset, Oissuing_pc->after_save());  // likewise set I1 to a value local to the caller

   __ call_VM_leaf(L7_thread_cache,

                   CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address),

                   G2_thread, Oissuing_pc->after_save());

   // The caller's SP was adjusted upon method entry to accomodate

   // the callee's non-argument locals. Undo that adjustment.

   __ JMP(O0, 0);                         // return exception handler in caller

   __ delayed()->restore(I5_savedSP, G0, SP);

   // (same old exception object is already in Oexception; see above)

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

 }

 void MethodHandles::RicochetFrame::enter_ricochet_frame(MacroAssembler* _masm,

                                                         Register recv_reg,

                                                         Register argv_reg,

                                                         address return_handler) {

   // does not include the __ save()

   assert(argv_reg == Gargs, "");

   Address G3_mh_vmtarget(   recv_reg, java_lang_invoke_MethodHandle::vmtarget_offset_in_bytes());

   Address G3_amh_conversion(recv_reg, java_lang_invoke_AdapterMethodHandle::conversion_offset_in_bytes());

   // Create the RicochetFrame.

   // Unlike on x86 we can store all required information in local

   // registers.

   BLOCK_COMMENT("push RicochetFrame {");

   __ set(ExternalAddress(return_handler),          L1_continuation);

   __ load_heap_oop(G3_mh_vmtarget,                 L2_saved_target);

   __ mov(G0,                                       L3_saved_args_layout);

   __ mov(Gargs,                                    L4_saved_args_base);

   __ lduw(G3_amh_conversion,                       L5_conversion);  // 32-bit field

   // I5, I6, I7 are already set up

   DEBUG_ONLY(__ set((int32_t) MAGIC_NUMBER_1,      L0_magic_number_1));

   BLOCK_COMMENT("} RicochetFrame");

 }

 void MethodHandles::RicochetFrame::leave_ricochet_frame(MacroAssembler* _masm,

                                                         Register recv_reg,

                                                         Register new_sp_reg,

                                                         Register sender_pc_reg) {

   assert(new_sp_reg == I5_savedSP, "exact_sender_sp already in place");

   assert(sender_pc_reg == I7, "in a fixed place");

   // does not include the __ ret() & __ restore()

   assert_different_registers(recv_reg, new_sp_reg, sender_pc_reg);

   // Take down the frame.

   // Cf. InterpreterMacroAssembler::remove_activation.

   BLOCK_COMMENT("end_ricochet_frame {");

   if (recv_reg->is_valid())

     __ mov(L2_saved_target, recv_reg);

   BLOCK_COMMENT("} end_ricochet_frame");

 }

 // Emit code to verify that FP is pointing at a valid ricochet frame.

 #ifdef ASSERT

 enum {

   ARG_LIMIT = 255, SLOP = 45,

   // use this parameter for checking for garbage stack movements:

   UNREASONABLE_STACK_MOVE = (ARG_LIMIT + SLOP)

   // the slop defends against false alarms due to fencepost errors

 };

 void MethodHandles::RicochetFrame::verify_clean(MacroAssembler* _masm) {

   // The stack should look like this:

   //    ... keep1 | dest=42 | keep2 | magic | handler | magic | recursive args | [RF]

   // Check various invariants.

   Register O7_temp = O7, O5_temp = O5;

   Label L_ok_1, L_ok_2, L_ok_3, L_ok_4;

   BLOCK_COMMENT("verify_clean {");

   // Magic numbers must check out:

   __ set((int32_t) MAGIC_NUMBER_1, O7_temp);

   __ cmp(O7_temp, L0_magic_number_1);

   __ br(Assembler::equal, false, Assembler::pt, L_ok_1);

   __ delayed()->nop();

   __ stop("damaged ricochet frame: MAGIC_NUMBER_1 not found");

   __ BIND(L_ok_1);

   // Arguments pointer must look reasonable:

 #ifdef _LP64

   Register FP_temp = O5_temp;

   __ add(FP, STACK_BIAS, FP_temp);

 #else

   Register FP_temp = FP;

 #endif

   __ cmp(L4_saved_args_base, FP_temp);

   __ br(Assembler::greaterEqualUnsigned, false, Assembler::pt, L_ok_2);

   __ delayed()->nop();

   __ stop("damaged ricochet frame: L4 < FP");

   __ BIND(L_ok_2);

   __ sub(L4_saved_args_base, UNREASONABLE_STACK_MOVE * Interpreter::stackElementSize, O7_temp);

   __ cmp(O7_temp, FP_temp);

   __ br(Assembler::lessEqualUnsigned, false, Assembler::pt, L_ok_3);

   __ delayed()->nop();

   __ stop("damaged ricochet frame: (L4 - UNREASONABLE_STACK_MOVE) > FP");

   __ BIND(L_ok_3);

   extract_conversion_dest_type(_masm, L5_conversion, O7_temp);

   __ cmp(O7_temp, T_VOID);

   __ br(Assembler::equal, false, Assembler::pt, L_ok_4);

   __ delayed()->nop();

   extract_conversion_vminfo(_masm, L5_conversion, O5_temp);

   __ ld_ptr(L4_saved_args_base, __ argument_offset(O5_temp, O5_temp), O7_temp);

   assert(__ is_simm13(RETURN_VALUE_PLACEHOLDER), "must be simm13");

   __ cmp(O7_temp, (int32_t) RETURN_VALUE_PLACEHOLDER);

   __ brx(Assembler::equal, false, Assembler::pt, L_ok_4);

   __ delayed()->nop();

   __ stop("damaged ricochet frame: RETURN_VALUE_PLACEHOLDER not found");

   __ BIND(L_ok_4);

   BLOCK_COMMENT("} verify_clean");

 }

 #endif //ASSERT

 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg, Register temp_reg, Register temp2_reg) {

   if (VerifyMethodHandles)

     verify_klass(_masm, klass_reg, SystemDictionaryHandles::Class_klass(), temp_reg, temp2_reg,

                  "AMH argument is a Class");

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

 }

 void MethodHandles::load_conversion_vminfo(MacroAssembler* _masm, Address conversion_field_addr, Register reg) {

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

   assert(CONV_VMINFO_MASK == right_n_bits(BitsPerByte), "else change type of following load");

   __ ldub(conversion_field_addr.plus_disp(BytesPerInt - 1), reg);

 }

 void MethodHandles::extract_conversion_vminfo(MacroAssembler* _masm, Register conversion_field_reg, Register reg) {

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

   __ and3(conversion_field_reg, CONV_VMINFO_MASK, reg);

 }

 void MethodHandles::extract_conversion_dest_type(MacroAssembler* _masm, Register conversion_field_reg, Register reg) {

   __ srl(conversion_field_reg, CONV_DEST_TYPE_SHIFT, reg);

   __ and3(reg, 0x0F, reg);

 }

 void MethodHandles::load_stack_move(MacroAssembler* _masm,

                                     Address G3_amh_conversion,

                                     Register stack_move_reg) {

   BLOCK_COMMENT("load_stack_move {");

   __ ldsw(G3_amh_conversion, stack_move_reg);

   __ sra(stack_move_reg, CONV_STACK_MOVE_SHIFT, stack_move_reg);

   if (VerifyMethodHandles) {

     Label L_ok, L_bad;

     int32_t stack_move_limit = 0x0800;  // extra-large

     __ cmp(stack_move_reg, stack_move_limit);

     __ br(Assembler::greaterEqual, false, Assembler::pn, L_bad);

     __ delayed()->nop();

     __ cmp(stack_move_reg, -stack_move_limit);

     __ br(Assembler::greater, false, Assembler::pt, L_ok);

     __ delayed()->nop();

     __ BIND(L_bad);

     __ stop("load_stack_move of garbage value");

     __ BIND(L_ok);

   }

   BLOCK_COMMENT("} load_stack_move");

 }

 #ifdef ASSERT

 void MethodHandles::RicochetFrame::verify() const {

   assert(magic_number_1() == MAGIC_NUMBER_1, "");

   if (!Universe::heap()->is_gc_active()) {

     if (saved_args_layout() != NULL) {

       assert(saved_args_layout()->is_method(), "must be valid oop");

     }

     if (saved_target() != NULL) {

       assert(java_lang_invoke_MethodHandle::is_instance(saved_target()), "checking frame value");

     }

   }

   int conv_op = adapter_conversion_op(conversion());

   assert(conv_op == java_lang_invoke_AdapterMethodHandle::OP_COLLECT_ARGS ||

          conv_op == java_lang_invoke_AdapterMethodHandle::OP_FOLD_ARGS ||

          conv_op == java_lang_invoke_AdapterMethodHandle::OP_PRIM_TO_REF,

          "must be a sane conversion");

   if (has_return_value_slot()) {

     assert(*return_value_slot_addr() == RETURN_VALUE_PLACEHOLDER, "");

   }

 }

 void MethodHandles::verify_argslot(MacroAssembler* _masm, Register argslot_reg, Register temp_reg, const char* error_message) {

   // Verify that argslot lies within (Gargs, FP].

   Label L_ok, L_bad;

   BLOCK_COMMENT("verify_argslot {");

   __ add(FP, STACK_BIAS, temp_reg);  // STACK_BIAS is zero on !_LP64

   __ cmp(argslot_reg, temp_reg);

   __ brx(Assembler::greaterUnsigned, false, Assembler::pn, L_bad);

   __ delayed()->nop();

   __ cmp(Gargs, argslot_reg);

   __ brx(Assembler::lessEqualUnsigned, false, Assembler::pt, L_ok);

   __ delayed()->nop();

   __ BIND(L_bad);

   __ stop(error_message);

   __ BIND(L_ok);

   BLOCK_COMMENT("} verify_argslot");

 }

 void MethodHandles::verify_argslots(MacroAssembler* _masm,

                                     RegisterOrConstant arg_slots,

                                     Register arg_slot_base_reg,

                                     Register temp_reg,

                                     Register temp2_reg,

                                     bool negate_argslots,

                                     const char* error_message) {

   // Verify that [argslot..argslot+size) lies within (Gargs, FP).

   Label L_ok, L_bad;

   BLOCK_COMMENT("verify_argslots {");

   if (negate_argslots) {

     if (arg_slots.is_constant()) {

       arg_slots = -1 * arg_slots.as_constant();

     } else {

       __ neg(arg_slots.as_register(), temp_reg);

       arg_slots = temp_reg;

     }

   }

   __ add(arg_slot_base_reg, __ argument_offset(arg_slots, temp_reg), temp_reg);

   __ add(FP, STACK_BIAS, temp2_reg);  // STACK_BIAS is zero on !_LP64

   __ cmp(temp_reg, temp2_reg);

   __ brx(Assembler::greaterUnsigned, false, Assembler::pn, L_bad);

   __ delayed()->nop();

   // Gargs points to the first word so adjust by BytesPerWord

   __ add(arg_slot_base_reg, BytesPerWord, temp_reg);

   __ cmp(Gargs, temp_reg);

   __ brx(Assembler::lessEqualUnsigned, false, Assembler::pt, L_ok);

   __ delayed()->nop();

   __ BIND(L_bad);

   __ stop(error_message);

   __ BIND(L_ok);

   BLOCK_COMMENT("} verify_argslots");

 }

 // Make sure that arg_slots has the same sign as the given direction.

 // If (and only if) arg_slots is a assembly-time constant, also allow it to be zero.

 void MethodHandles::verify_stack_move(MacroAssembler* _masm,

                                       RegisterOrConstant arg_slots, int direction) {

   enum { UNREASONABLE_STACK_MOVE = 256 * 4 };  // limit of 255 arguments

   bool allow_zero = arg_slots.is_constant();

   if (direction == 0) { direction = +1; allow_zero = true; }

   assert(stack_move_unit() == -1, "else add extra checks here");

   if (arg_slots.is_register()) {

     Label L_ok, L_bad;

     BLOCK_COMMENT("verify_stack_move {");

     // __ btst(-stack_move_unit() - 1, arg_slots.as_register());  // no need

     // __ br(Assembler::notZero, false, Assembler::pn, L_bad);

     // __ delayed()->nop();

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

     if (direction > 0) {

       __ br(allow_zero ? Assembler::less : Assembler::lessEqual, false, Assembler::pn, L_bad);

       __ delayed()->nop();

       __ cmp(arg_slots.as_register(), (int32_t) UNREASONABLE_STACK_MOVE);

       __ br(Assembler::less, false, Assembler::pn, L_ok);

       __ delayed()->nop();

     } else {

       __ br(allow_zero ? Assembler::greater : Assembler::greaterEqual, false, Assembler::pn, L_bad);

       __ delayed()->nop();

       __ cmp(arg_slots.as_register(), (int32_t) -UNREASONABLE_STACK_MOVE);

       __ br(Assembler::greater, false, Assembler::pn, L_ok);

       __ delayed()->nop();

     }

     __ BIND(L_bad);

     if (direction > 0)

       __ stop("assert arg_slots > 0");

     else

       __ stop("assert arg_slots < 0");

     __ BIND(L_ok);

     BLOCK_COMMENT("} verify_stack_move");

   } else {

     intptr_t size = arg_slots.as_constant();

     if (direction < 0)  size = -size;

     assert(size >= 0, "correct direction of constant move");

     assert(size < UNREASONABLE_STACK_MOVE, "reasonable size of constant move");

   }

 }

 void MethodHandles::verify_klass(MacroAssembler* _masm,

                                  Register obj_reg, KlassHandle klass,

                                  Register temp_reg, Register temp2_reg,

                                  const char* error_message) {

   oop* klass_addr = klass.raw_value();

   assert(klass_addr >= SystemDictionaryHandles::Object_klass().raw_value() &&

          klass_addr <= SystemDictionaryHandles::Long_klass().raw_value(),

          "must be one of the SystemDictionaryHandles");

   Label L_ok, L_bad;

   BLOCK_COMMENT("verify_klass {");

   __ verify_oop(obj_reg);

   __ br_null(obj_reg, false, Assembler::pn, L_bad);

   __ delayed()->nop();

   __ load_klass(obj_reg, temp_reg);

   __ set(ExternalAddress(klass_addr), temp2_reg);

   __ ld_ptr(Address(temp2_reg, 0), temp2_reg);

   __ cmp(temp_reg, temp2_reg);

   __ brx(Assembler::equal, false, Assembler::pt, L_ok);

   __ delayed()->nop();

   intptr_t super_check_offset = klass->super_check_offset();

   __ ld_ptr(Address(temp_reg, super_check_offset), temp_reg);

   __ set(ExternalAddress(klass_addr), temp2_reg);

   __ ld_ptr(Address(temp2_reg, 0), temp2_reg);

   __ cmp(temp_reg, temp2_reg);

   __ brx(Assembler::equal, false, Assembler::pt, L_ok);

   __ delayed()->nop();

   __ BIND(L_bad);

   __ stop(error_message);

   __ BIND(L_ok);

   BLOCK_COMMENT("} verify_klass");

 }

 #endif // ASSERT

 // Code generation

 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm) {

   // I5_savedSP/O5_savedSP: sender SP (must preserve)

   // G4 (Gargs): incoming argument list (must preserve)

   // G5_method:  invoke methodOop

   // G3_method_handle: receiver method handle (must load from sp[MethodTypeForm.vmslots])

   // O0, O1, O2, O3, O4: garbage temps, blown away

   Register O0_mtype   = O0;

   Register O1_scratch = O1;

   Register O2_scratch = O2;

   Register O3_scratch = O3;

   Register O4_argslot = O4;

   Register O4_argbase = O4;

   // emit WrongMethodType path first, to enable 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), "");;

   __ ldub(Address(G5_method, methodOopDesc::intrinsic_id_offset_in_bytes()), O1_scratch);

   __ cmp(O1_scratch, (int) vmIntrinsics::_invokeExact);

   __ brx(Assembler::notEqual, false, Assembler::pt, invoke_generic_slow_path);

   __ delayed()->nop();

   __ mov(O0_mtype, G5_method_type);  // required by throw_WrongMethodType

   // mov(G3_method_handle, G3_method_handle);  // already in this register

   __ jump_to(AddressLiteral(Interpreter::throw_WrongMethodType_entry()), O1_scratch);

   __ delayed()->nop();

   // here's where control starts out:

   __ align(CodeEntryAlignment);

   address entry_point = __ pc();

   // fetch the MethodType from the method handle

   // FIXME: Interpreter should transmit pre-popped stack pointer, to locate base of arg list.

   // This would simplify several touchy bits of code.

   // See 6984712: JSR 292 method handle calls need a clean argument base pointer

   {

     Register tem = G5_method;

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

       __ ld_ptr(Address(tem, *pchase), O0_mtype);

       tem = O0_mtype;          // in case there is another indirection

     }

   }

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

   __ load_heap_oop(Address(O0_mtype,   __ delayed_value(java_lang_invoke_MethodType::form_offset_in_bytes,        O1_scratch)), O4_argslot);

   __ ldsw(         Address(O4_argslot, __ delayed_value(java_lang_invoke_MethodTypeForm::vmslots_offset_in_bytes, O1_scratch)), O4_argslot);

   __ add(__ argument_address(O4_argslot, O4_argslot, 1), O4_argbase);

   // Note: argument_address uses its input as a scratch register!

   Address mh_receiver_slot_addr(O4_argbase, -Interpreter::stackElementSize);

   __ ld_ptr(mh_receiver_slot_addr, G3_method_handle);

   trace_method_handle(_masm, "invokeExact");

   __ check_method_handle_type(O0_mtype, G3_method_handle, O1_scratch, wrong_method_type);

   // Nobody uses the MH receiver slot after this.  Make sure.

   DEBUG_ONLY(__ set((int32_t) 0x999999, O1_scratch); __ st_ptr(O1_scratch, mh_receiver_slot_addr));

   __ jump_to_method_handle_entry(G3_method_handle, O1_scratch);

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

   __ bind(invoke_generic_slow_path);

 #ifdef ASSERT

   if (VerifyMethodHandles) {

     Label L;

     __ ldub(Address(G5_method, methodOopDesc::intrinsic_id_offset_in_bytes()), O1_scratch);

     __ cmp(O1_scratch, (int) vmIntrinsics::_invokeGeneric);

     __ brx(Assembler::equal, false, Assembler::pt, L);

     __ delayed()->nop();

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

     __ bind(L);

   }

 #endif //ASSERT

   // make room on the stack for another pointer:

   insert_arg_slots(_masm, 2 * stack_move_unit(), O4_argbase, O1_scratch, O2_scratch, O3_scratch);

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

   Register O2_form    = O2_scratch;

   Register O3_adapter = O3_scratch;

   __ load_heap_oop(Address(O0_mtype, __ delayed_value(java_lang_invoke_MethodType::form_offset_in_bytes,               O1_scratch)), O2_form);

   __ load_heap_oop(Address(O2_form,  __ delayed_value(java_lang_invoke_MethodTypeForm::genericInvoker_offset_in_bytes, O1_scratch)), O3_adapter);

   __ verify_oop(O3_adapter);

   __ st_ptr(O3_adapter, Address(O4_argbase, 1 * Interpreter::stackElementSize));

   // 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.)

   __ st_ptr(O0_mtype,   Address(O4_argbase, 0 * Interpreter::stackElementSize));

   // FIXME: assert that O3_adapter is of the right method-type.

   __ mov(O3_adapter, G3_method_handle);

   trace_method_handle(_masm, "invokeGeneric");

   __ jump_to_method_handle_entry(G3_method_handle, O1_scratch);

   return entry_point;

 }

 // Workaround for C++ overloading nastiness on '0' for RegisterOrConstant.

 static RegisterOrConstant constant(int value) {

   return RegisterOrConstant(value);

 }

 static void load_vmargslot(MacroAssembler* _masm, Address vmargslot_addr, Register result) {

   __ ldsw(vmargslot_addr, result);

 }

 static RegisterOrConstant adjust_SP_and_Gargs_down_by_slots(MacroAssembler* _masm,

                                                             RegisterOrConstant arg_slots,

                                                             Register temp_reg, Register temp2_reg) {

   // Keep the stack pointer 2*wordSize aligned.

   const int TwoWordAlignmentMask = right_n_bits(LogBytesPerWord + 1);

   if (arg_slots.is_constant()) {

     const int        offset = arg_slots.as_constant() << LogBytesPerWord;

     const int masked_offset = round_to(offset, 2 * BytesPerWord);

     const int masked_offset2 = (offset + 1*BytesPerWord) & ~TwoWordAlignmentMask;

     assert(masked_offset == masked_offset2, "must agree");

     __ sub(Gargs,        offset, Gargs);

     __ sub(SP,    masked_offset, SP   );

     return offset;

   } else {

 #ifdef ASSERT

     {

       Label L_ok;

       __ cmp(arg_slots.as_register(), 0);

       __ br(Assembler::greaterEqual, false, Assembler::pt, L_ok);

       __ delayed()->nop();

       __ stop("negative arg_slots");

       __ bind(L_ok);

     }

 #endif

     __ sll_ptr(arg_slots.as_register(), LogBytesPerWord, temp_reg);

     __ add( temp_reg,  1*BytesPerWord,       temp2_reg);

     __ andn(temp2_reg, TwoWordAlignmentMask, temp2_reg);

     __ sub(Gargs, temp_reg,  Gargs);

     __ sub(SP,    temp2_reg, SP   );

     return temp_reg;

   }

 }

 static RegisterOrConstant adjust_SP_and_Gargs_up_by_slots(MacroAssembler* _masm,

                                                           RegisterOrConstant arg_slots,

                                                           Register temp_reg, Register temp2_reg) {

   // Keep the stack pointer 2*wordSize aligned.

   const int TwoWordAlignmentMask = right_n_bits(LogBytesPerWord + 1);

   if (arg_slots.is_constant()) {

     const int        offset = arg_slots.as_constant() << LogBytesPerWord;

     const int masked_offset = offset & ~TwoWordAlignmentMask;

     __ add(Gargs,        offset, Gargs);

     __ add(SP,    masked_offset, SP   );

     return offset;

   } else {

     __ sll_ptr(arg_slots.as_register(), LogBytesPerWord, temp_reg);

     __ andn(temp_reg, TwoWordAlignmentMask, temp2_reg);

     __ add(Gargs, temp_reg,  Gargs);

     __ add(SP,    temp2_reg, SP   );

     return temp_reg;

   }

 }

 // Helper to insert argument slots into the stack.

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

 // argslot_reg is decremented to point to the new (shifted) location of the argslot

 // But, temp_reg ends up holding the original value of argslot_reg.

 void MethodHandles::insert_arg_slots(MacroAssembler* _masm,

                                      RegisterOrConstant arg_slots,

                                      Register argslot_reg,

                                      Register temp_reg, Register temp2_reg, Register temp3_reg) {

   // allow constant zero

   if (arg_slots.is_constant() && arg_slots.as_constant() == 0)

     return;

   assert_different_registers(argslot_reg, temp_reg, temp2_reg, temp3_reg,

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

   BLOCK_COMMENT("insert_arg_slots {");

   if (VerifyMethodHandles)

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

   if (VerifyMethodHandles)

     verify_stack_move(_masm, arg_slots, -1);

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

   // Then pull down everything shallower than argslot_reg.

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

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

   //   sp -= size;

   //   for (temp = sp + size; temp < argslot; temp++)

   //     temp[-size] = temp[0]

   //   argslot -= size;

   // offset is temp3_reg in case of arg_slots being a register.

   RegisterOrConstant offset = adjust_SP_and_Gargs_up_by_slots(_masm, arg_slots, temp3_reg, temp_reg);

   __ sub(Gargs, offset, temp_reg);  // source pointer for copy

   {

     Label loop;

     __ BIND(loop);

     // pull one word down each time through the loop

     __ ld_ptr(           Address(temp_reg, 0     ), temp2_reg);

     __ st_ptr(temp2_reg, Address(temp_reg, offset)           );

     __ add(temp_reg, wordSize, temp_reg);

     __ cmp(temp_reg, argslot_reg);

     __ brx(Assembler::lessUnsigned, false, Assembler::pt, loop);

     __ delayed()->nop();  // FILLME

   }

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

   __ add(argslot_reg, offset, argslot_reg);

   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 argslot_reg,

                                      Register temp_reg, Register temp2_reg, Register temp3_reg) {

   // allow constant zero

   if (arg_slots.is_constant() && arg_slots.as_constant() == 0)

     return;

   assert_different_registers(argslot_reg, temp_reg, temp2_reg, temp3_reg,

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

   BLOCK_COMMENT("remove_arg_slots {");

   if (VerifyMethodHandles)

     verify_argslots(_masm, arg_slots, argslot_reg, temp_reg, temp2_reg, false,

                     "deleted argument(s) must fall within current frame");

   if (VerifyMethodHandles)

     verify_stack_move(_masm, arg_slots, +1);

   // Pull up everything shallower than argslot.

   // Then remove the excess space on the stack.

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

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

   //   for (temp = argslot-1; temp >= sp; --temp)

   //     temp[size] = temp[0]

   //   argslot += size;

   //   sp += size;

   RegisterOrConstant offset = __ regcon_sll_ptr(arg_slots, LogBytesPerWord, temp3_reg);

   __ sub(argslot_reg, wordSize, temp_reg);  // source pointer for copy

   {

     Label L_loop;

     __ BIND(L_loop);

     // pull one word up each time through the loop

     __ ld_ptr(           Address(temp_reg, 0     ), temp2_reg);

     __ st_ptr(temp2_reg, Address(temp_reg, offset)           );

     __ sub(temp_reg, wordSize, temp_reg);

     __ cmp(temp_reg, Gargs);

     __ brx(Assembler::greaterEqualUnsigned, false, Assembler::pt, L_loop);

     __ delayed()->nop();  // FILLME

   }

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

   __ add(argslot_reg, offset, argslot_reg);

   // We don't need the offset at this point anymore, just adjust SP and Gargs.

   (void) adjust_SP_and_Gargs_up_by_slots(_masm, arg_slots, temp3_reg, temp_reg);

   BLOCK_COMMENT("} remove_arg_slots");

 }

 // Helper to copy argument slots to the top of the stack.

 // The sequence starts with argslot_reg and is counted by slot_count

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

 // This function blows the temps but does not change argslot_reg.

 void MethodHandles::push_arg_slots(MacroAssembler* _masm,

                                    Register argslot_reg,

                                    RegisterOrConstant slot_count,

                                    Register temp_reg, Register temp2_reg) {

   // allow constant zero

   if (slot_count.is_constant() && slot_count.as_constant() == 0)

     return;

   assert_different_registers(argslot_reg, temp_reg, temp2_reg,

                              (!slot_count.is_register() ? Gargs : slot_count.as_register()),

                              SP);

   assert(Interpreter::stackElementSize == wordSize, "else change this code");

   BLOCK_COMMENT("push_arg_slots {");

   if (VerifyMethodHandles)

     verify_stack_move(_masm, slot_count, 0);

   RegisterOrConstant offset = adjust_SP_and_Gargs_down_by_slots(_masm, slot_count, temp2_reg, temp_reg);

   if (slot_count.is_constant()) {

     for (int i = slot_count.as_constant() - 1; i >= 0; i--) {

       __ ld_ptr(          Address(argslot_reg, i * wordSize), temp_reg);

       __ st_ptr(temp_reg, Address(Gargs,       i * wordSize));

     }

   } else {

     Label L_plural, L_loop, L_break;

     // Emit code to dynamically check for the common cases, zero and one slot.

     __ cmp(slot_count.as_register(), (int32_t) 1);

     __ br(Assembler::greater, false, Assembler::pn, L_plural);

     __ delayed()->nop();

     __ br(Assembler::less, false, Assembler::pn, L_break);

     __ delayed()->nop();

     __ ld_ptr(          Address(argslot_reg, 0), temp_reg);

     __ st_ptr(temp_reg, Address(Gargs,       0));

     __ ba(false, L_break);

     __ delayed()->nop();  // FILLME

     __ BIND(L_plural);

     // Loop for 2 or more:

     //   top = &argslot[slot_count]

     //   while (top > argslot)  *(--Gargs) = *(--top)

     Register top_reg = temp_reg;

     __ add(argslot_reg, offset, top_reg);

     __ add(Gargs,       offset, Gargs  );  // move back up again so we can go down

     __ BIND(L_loop);

     __ sub(top_reg, wordSize, top_reg);

     __ sub(Gargs,   wordSize, Gargs  );

     __ ld_ptr(           Address(top_reg, 0), temp2_reg);

     __ st_ptr(temp2_reg, Address(Gargs,   0));

     __ cmp(top_reg, argslot_reg);

     __ brx(Assembler::greaterUnsigned, false, Assembler::pt, L_loop);

     __ delayed()->nop();  // FILLME

     __ BIND(L_break);

   }

   BLOCK_COMMENT("} push_arg_slots");

 }

 // in-place movement; no change to Gargs

 // blows temp_reg, temp2_reg

 void MethodHandles::move_arg_slots_up(MacroAssembler* _masm,

                                       Register bottom_reg,  // invariant

                                       Address  top_addr,    // can use temp_reg

                                       RegisterOrConstant positive_distance_in_slots,  // destroyed if register

                                       Register temp_reg, Register temp2_reg) {

   assert_different_registers(bottom_reg,

                              temp_reg, temp2_reg,

                              positive_distance_in_slots.register_or_noreg());

   BLOCK_COMMENT("move_arg_slots_up {");

   Label L_loop, L_break;

   Register top_reg = temp_reg;

   if (!top_addr.is_same_address(Address(top_reg, 0))) {

     __ add(top_addr, top_reg);

   }

   // Detect empty (or broken) loop:

 #ifdef ASSERT

   if (VerifyMethodHandles) {

     // Verify that &bottom < &top (non-empty interval)

     Label L_ok, L_bad;

     if (positive_distance_in_slots.is_register()) {

       __ cmp(positive_distance_in_slots.as_register(), (int32_t) 0);

       __ br(Assembler::lessEqual, false, Assembler::pn, L_bad);

       __ delayed()->nop();

     }

     __ cmp(bottom_reg, top_reg);

     __ brx(Assembler::lessUnsigned, false, Assembler::pt, L_ok);

     __ delayed()->nop();

     __ BIND(L_bad);

     __ stop("valid bounds (copy up)");

     __ BIND(L_ok);

   }

 #endif

   __ cmp(bottom_reg, top_reg);

   __ brx(Assembler::greaterEqualUnsigned, false, Assembler::pn, L_break);

   __ delayed()->nop();

   // work top down to bottom, copying contiguous data upwards

   // In pseudo-code:

   //   while (--top >= bottom) *(top + distance) = *(top + 0);

   RegisterOrConstant offset = __ argument_offset(positive_distance_in_slots, positive_distance_in_slots.register_or_noreg());

   __ BIND(L_loop);

   __ sub(top_reg, wordSize, top_reg);

   __ ld_ptr(           Address(top_reg, 0     ), temp2_reg);

   __ st_ptr(temp2_reg, Address(top_reg, offset)           );

   __ cmp(top_reg, bottom_reg);

   __ brx(Assembler::greaterUnsigned, false, Assembler::pt, L_loop);

   __ delayed()->nop();  // FILLME

   assert(Interpreter::stackElementSize == wordSize, "else change loop");

   __ BIND(L_break);

   BLOCK_COMMENT("} move_arg_slots_up");

 }

 // in-place movement; no change to rsp

 // blows temp_reg, temp2_reg

 void MethodHandles::move_arg_slots_down(MacroAssembler* _masm,

                                         Address  bottom_addr,  // can use temp_reg

                                         Register top_reg,      // invariant

                                         RegisterOrConstant negative_distance_in_slots,  // destroyed if register

                                         Register temp_reg, Register temp2_reg) {

   assert_different_registers(top_reg,

                              negative_distance_in_slots.register_or_noreg(),

                              temp_reg, temp2_reg);

   BLOCK_COMMENT("move_arg_slots_down {");

   Label L_loop, L_break;

   Register bottom_reg = temp_reg;

   if (!bottom_addr.is_same_address(Address(bottom_reg, 0))) {

     __ add(bottom_addr, bottom_reg);

   }

   // Detect empty (or broken) loop:

 #ifdef ASSERT

   assert(!negative_distance_in_slots.is_constant() || negative_distance_in_slots.as_constant() < 0, "");

   if (VerifyMethodHandles) {

     // Verify that &bottom < &top (non-empty interval)

     Label L_ok, L_bad;

     if (negative_distance_in_slots.is_register()) {

       __ cmp(negative_distance_in_slots.as_register(), (int32_t) 0);

       __ br(Assembler::greaterEqual, false, Assembler::pn, L_bad);

       __ delayed()->nop();

     }

     __ cmp(bottom_reg, top_reg);

     __ brx(Assembler::lessUnsigned, false, Assembler::pt, L_ok);

     __ delayed()->nop();

     __ BIND(L_bad);

     __ stop("valid bounds (copy down)");

     __ BIND(L_ok);

   }

 #endif

   __ cmp(bottom_reg, top_reg);

   __ brx(Assembler::greaterEqualUnsigned, false, Assembler::pn, L_break);

   __ delayed()->nop();

   // work bottom up to top, copying contiguous data downwards

   // In pseudo-code:

   //   while (bottom < top) *(bottom - distance) = *(bottom + 0), bottom++;

   RegisterOrConstant offset = __ argument_offset(negative_distance_in_slots, negative_distance_in_slots.register_or_noreg());

   __ BIND(L_loop);

   __ ld_ptr(           Address(bottom_reg, 0     ), temp2_reg);

   __ st_ptr(temp2_reg, Address(bottom_reg, offset)           );

   __ add(bottom_reg, wordSize, bottom_reg);

   __ cmp(bottom_reg, top_reg);

   __ brx(Assembler::lessUnsigned, false, Assembler::pt, L_loop);

   __ delayed()->nop();  // FILLME

   assert(Interpreter::stackElementSize == wordSize, "else change loop");

   __ BIND(L_break);

   BLOCK_COMMENT("} move_arg_slots_down");

 }

 // Copy from a field or array element to a stacked argument slot.

 // is_element (ignored) says whether caller is loading an array element instead of an instance field.

 void MethodHandles::move_typed_arg(MacroAssembler* _masm,

                                    BasicType type, bool is_element,

                                    Address value_src, Address slot_dest,

                                    Register temp_reg) {

   assert(!slot_dest.uses(temp_reg), "must be different register");

   BLOCK_COMMENT(!is_element ? "move_typed_arg {" : "move_typed_arg { (array element)");

   if (type == T_OBJECT || type == T_ARRAY) {

     __ load_heap_oop(value_src, temp_reg);

     __ verify_oop(temp_reg);

     __ st_ptr(temp_reg, slot_dest);

   } else if (type != T_VOID) {

     int  arg_size      = type2aelembytes(type);

     bool arg_is_signed = is_signed_subword_type(type);

     int  slot_size     = is_subword_type(type) ? type2aelembytes(T_INT) : arg_size;  // store int sub-words as int

     __ load_sized_value( value_src, temp_reg, arg_size, arg_is_signed);

     __ store_sized_value(temp_reg, slot_dest, slot_size              );

   }

   BLOCK_COMMENT("} move_typed_arg");

 }

 // Cf. TemplateInterpreterGenerator::generate_return_entry_for and

 // InterpreterMacroAssembler::save_return_value

 void MethodHandles::move_return_value(MacroAssembler* _masm, BasicType type,

                                       Address return_slot) {

   BLOCK_COMMENT("move_return_value {");

   // Look at the type and pull the value out of the corresponding register.

   if (type == T_VOID) {

     // nothing to do

   } else if (type == T_OBJECT) {

     __ verify_oop(O0);

     __ st_ptr(O0, return_slot);

   } else if (type == T_INT || is_subword_type(type)) {

     int type_size = type2aelembytes(T_INT);

     __ store_sized_value(O0, return_slot, type_size);

   } else if (type == T_LONG) {

     // store the value by parts

     // Note: We assume longs are continguous (if misaligned) on the interpreter stack.

 #if !defined(_LP64) && defined(COMPILER2)

     __ stx(G1, return_slot);

 #else

   #ifdef _LP64

     __ stx(O0, return_slot);

   #else

     if (return_slot.has_disp()) {

       // The displacement is a constant

       __ st(O0, return_slot);

       __ st(O1, return_slot.plus_disp(Interpreter::stackElementSize));

     } else {

       __ std(O0, return_slot);

     }

   #endif

 #endif

   } else if (type == T_FLOAT) {

     __ stf(FloatRegisterImpl::S, Ftos_f, return_slot);

   } else if (type == T_DOUBLE) {

     __ stf(FloatRegisterImpl::D, Ftos_f, return_slot);

   } else {

     ShouldNotReachHere();

   }

   BLOCK_COMMENT("} move_return_value");

 }

 #ifndef PRODUCT

 extern "C" void print_method_handle(oop mh);

 void trace_method_handle_stub(const char* adaptername,

                               oopDesc* mh,

                               intptr_t* saved_sp) {

   bool has_mh = (strstr(adaptername, "return/") == NULL);  // return adapters don't have mh

   tty->print_cr("MH %s mh="INTPTR_FORMAT " saved_sp=" INTPTR_FORMAT, adaptername, (intptr_t) mh, saved_sp);

   if (has_mh)

     print_method_handle(mh);

 }

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

   if (!TraceMethodHandles)  return;

   BLOCK_COMMENT("trace_method_handle {");

   // save: Gargs, O5_savedSP

   __ save_frame(16);

   __ set((intptr_t) adaptername, O0);

   __ mov(G3_method_handle, O1);

   __ mov(I5_savedSP, O2);

   __ mov(G3_method_handle, L3);

   __ mov(Gargs, L4);

   __ mov(G5_method_type, L5);

   __ call_VM_leaf(L7, CAST_FROM_FN_PTR(address, trace_method_handle_stub));

   __ mov(L3, G3_method_handle);

   __ mov(L4, Gargs);

   __ mov(L5, G5_method_type);

   __ restore();

   BLOCK_COMMENT("} trace_method_handle");

 }

 #endif // PRODUCT

 // which conversion op types are implemented here?

 int MethodHandles::adapter_conversion_ops_supported_mask() {

   return ((1<<java_lang_invoke_AdapterMethodHandle::OP_RETYPE_ONLY)

          |(1<<java_lang_invoke_AdapterMethodHandle::OP_RETYPE_RAW)

          |(1<<java_lang_invoke_AdapterMethodHandle::OP_CHECK_CAST)

          |(1<<java_lang_invoke_AdapterMethodHandle::OP_PRIM_TO_PRIM)

          |(1<<java_lang_invoke_AdapterMethodHandle::OP_REF_TO_PRIM)

           // OP_PRIM_TO_REF is below...

          |(1<<java_lang_invoke_AdapterMethodHandle::OP_SWAP_ARGS)

          |(1<<java_lang_invoke_AdapterMethodHandle::OP_ROT_ARGS)

          |(1<<java_lang_invoke_AdapterMethodHandle::OP_DUP_ARGS)

          |(1<<java_lang_invoke_AdapterMethodHandle::OP_DROP_ARGS)

           // OP_COLLECT_ARGS is below...

          |(1<<java_lang_invoke_AdapterMethodHandle::OP_SPREAD_ARGS)

          |(!UseRicochetFrames ? 0 :

            java_lang_invoke_MethodTypeForm::vmlayout_offset_in_bytes() <= 0 ? 0 :

            ((1<<java_lang_invoke_AdapterMethodHandle::OP_PRIM_TO_REF)

            |(1<<java_lang_invoke_AdapterMethodHandle::OP_COLLECT_ARGS)

            |(1<<java_lang_invoke_AdapterMethodHandle::OP_FOLD_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) {

   MethodHandles::EntryKind ek_orig = ek_original_kind(ek);

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

   // as set up by generate_method_handle_interpreter_entry():

   // - G5: garbage temp (was MethodHandle.invoke methodOop, unused)

   // - G3: receiver method handle

   // - O5_savedSP: sender SP (must preserve)

   const Register O0_scratch = O0;

   const Register O1_scratch = O1;

   const Register O2_scratch = O2;

   const Register O3_scratch = O3;

   const Register O4_scratch = O4;

   const Register G5_scratch = G5;

   // Often used names:

   const Register O0_argslot = O0;

   // Argument registers for _raise_exception:

   const Register O0_code     = O0;

   const Register O1_actual   = O1;

   const Register O2_required = O2;

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

   // Some handy addresses:

   Address G5_method_fie(    G5_method,        in_bytes(methodOopDesc::from_interpreted_offset()));

   Address G5_method_fce(    G5_method,        in_bytes(methodOopDesc::from_compiled_offset()));

   Address G3_mh_vmtarget(   G3_method_handle, java_lang_invoke_MethodHandle::vmtarget_offset_in_bytes());

   Address G3_dmh_vmindex(   G3_method_handle, java_lang_invoke_DirectMethodHandle::vmindex_offset_in_bytes());

   Address G3_bmh_vmargslot( G3_method_handle, java_lang_invoke_BoundMethodHandle::vmargslot_offset_in_bytes());

   Address G3_bmh_argument(  G3_method_handle, java_lang_invoke_BoundMethodHandle::argument_offset_in_bytes());

   Address G3_amh_vmargslot( G3_method_handle, java_lang_invoke_AdapterMethodHandle::vmargslot_offset_in_bytes());

   Address G3_amh_argument ( G3_method_handle, java_lang_invoke_AdapterMethodHandle::argument_offset_in_bytes());

   Address G3_amh_conversion(G3_method_handle, java_lang_invoke_AdapterMethodHandle::conversion_offset_in_bytes());

   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(err_msg("Entry %s {", 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 the compiled entry, arguments are

       // expected in compiler argument registers.

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

       assert(raise_exception_method()->from_compiled_entry(), "method must be linked");

       __ mov(O5_savedSP, SP);  // Cut the stack back to where the caller started.

       Label L_no_method;

       // FIXME: fill in _raise_exception_method with a suitable java.lang.invoke method

       __ set(AddressLiteral((address) &_raise_exception_method), G5_method);

       __ ld_ptr(Address(G5_method, 0), G5_method);

       __ tst(G5_method);

       __ brx(Assembler::zero, false, Assembler::pn, L_no_method);

       __ delayed()->nop();

       const int jobject_oop_offset = 0;

       __ ld_ptr(Address(G5_method, jobject_oop_offset), G5_method);

       __ tst(G5_method);

       __ brx(Assembler::zero, false, Assembler::pn, L_no_method);

       __ delayed()->nop();

       __ verify_oop(G5_method);

       __ jump_indirect_to(G5_method_fce, O3_scratch);  // jump to compiled entry

       __ delayed()->nop();

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

       __ bind(L_no_method);

       __ unimplemented("call throw_WrongMethodType_entry");

     }

     break;

   case _invokestatic_mh:

   case _invokespecial_mh:

     {

       __ load_heap_oop(G3_mh_vmtarget, G5_method);  // target is a methodOop

       __ verify_oop(G5_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(O0_argslot, G3_method_handle, O1_scratch);

         __ ld_ptr(__ argument_address(O0_argslot, O0_argslot, -1), G3_method_handle);

         __ null_check(G3_method_handle);

         __ verify_oop(G3_method_handle);

       }

       __ jump_indirect_to(G5_method_fie, O1_scratch);

       __ delayed()->nop();

     }

     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:

       Register O2_index = O2_scratch;

       __ load_method_handle_vmslots(O0_argslot, G3_method_handle, O1_scratch);

       __ ldsw(G3_dmh_vmindex, O2_index);

       // Note:  The verifier allows us to ignore G3_mh_vmtarget.

       __ ld_ptr(__ argument_address(O0_argslot, O0_argslot, -1), G3_method_handle);

       __ null_check(G3_method_handle, oopDesc::klass_offset_in_bytes());

       // Get receiver klass:

       Register O0_klass = O0_argslot;

       __ load_klass(G3_method_handle, O0_klass);

       __ verify_oop(O0_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");

       __ sll_ptr(O2_index, LogBytesPerWord, O2_index);

       __ add(O0_klass, O2_index, O0_klass);

       Address vtable_entry_addr(O0_klass, base + vtableEntry::method_offset_in_bytes());

       __ ld_ptr(vtable_entry_addr, G5_method);

       __ verify_oop(G5_method);

       __ jump_indirect_to(G5_method_fie, O1_scratch);

       __ delayed()->nop();

     }

     break;

   case _invokeinterface_mh:

     {

       // Same as TemplateTable::invokeinterface,

       // minus the CP setup and profiling:

       __ load_method_handle_vmslots(O0_argslot, G3_method_handle, O1_scratch);

       Register O1_intf  = O1_scratch;

       Register G5_index = G5_scratch;

       __ load_heap_oop(G3_mh_vmtarget, O1_intf);

       __ ldsw(G3_dmh_vmindex, G5_index);

       __ ld_ptr(__ argument_address(O0_argslot, O0_argslot, -1), G3_method_handle);

       __ null_check(G3_method_handle, oopDesc::klass_offset_in_bytes());

       // Get receiver klass:

       Register O0_klass = O0_argslot;

       __ load_klass(G3_method_handle, O0_klass);

       __ verify_oop(O0_klass);

       // Get interface:

       Label no_such_interface;

       __ verify_oop(O1_intf);

       __ lookup_interface_method(O0_klass, O1_intf,

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

                                  G5_index, G5_method,

                                  O2_scratch,

                                  O3_scratch,

                                  no_such_interface);

       __ verify_oop(G5_method);

       __ jump_indirect_to(G5_method_fie, O1_scratch);

       __ delayed()->nop();

       __ bind(no_such_interface);

       // Throw an exception.

       // For historical reasons, it will be IncompatibleClassChangeError.

       __ unimplemented("not tested yet");

       __ ld_ptr(Address(O1_intf, java_mirror_offset), O2_required);  // required interface

       __ mov(   O0_klass,                             O1_actual);    // bad receiver

       __ jump_to(AddressLiteral(from_interpreted_entry(_raise_exception)), O3_scratch);

       __ delayed()->mov(Bytecodes::_invokeinterface,  O0_code);      // who is complaining?

     }

     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:

     {

       const bool direct_to_method = (ek >= _bound_ref_direct_mh);

       BasicType arg_type  = ek_bound_mh_arg_type(ek);

       int       arg_slots = type2size[arg_type];

       // Make room for the new argument:

       load_vmargslot(_masm, G3_bmh_vmargslot, O0_argslot);

       __ add(__ argument_address(O0_argslot, O0_argslot), O0_argslot);

       insert_arg_slots(_masm, arg_slots * stack_move_unit(), O0_argslot, O1_scratch, O2_scratch, O3_scratch);

       // Store bound argument into the new stack slot:

       __ load_heap_oop(G3_bmh_argument, O1_scratch);

       if (arg_type == T_OBJECT) {

         __ st_ptr(O1_scratch, Address(O0_argslot, 0));

       } else {

         Address prim_value_addr(O1_scratch, java_lang_boxing_object::value_offset_in_bytes(arg_type));

         move_typed_arg(_masm, arg_type, false,

                        prim_value_addr,

                        Address(O0_argslot, 0),

                        O2_scratch);  // must be an even register for !_LP64 long moves (uses O2/O3)

       }

       if (direct_to_method) {

         __ load_heap_oop(G3_mh_vmtarget, G5_method);  // target is a methodOop

         __ verify_oop(G5_method);

         __ jump_indirect_to(G5_method_fie, O1_scratch);

         __ delayed()->nop();

       } else {

         __ load_heap_oop(G3_mh_vmtarget, G3_method_handle);  // target is a methodOop

         __ verify_oop(G3_method_handle);

         __ jump_to_method_handle_entry(G3_method_handle, O1_scratch);

       }

     }

     break;

   case _adapter_retype_only:

   case _adapter_retype_raw:

     // Immediately jump to the next MH layer:

     __ load_heap_oop(G3_mh_vmtarget, G3_method_handle);

     __ verify_oop(G3_method_handle);

     __ jump_to_method_handle_entry(G3_method_handle, O1_scratch);

     // This is OK when all parameter types widen.

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

     break;

   case _adapter_check_cast:

     {

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

       load_vmargslot(_masm, G3_amh_vmargslot, O0_argslot);

       Address vmarg = __ argument_address(O0_argslot, O0_argslot);

       // What class are we casting to?

       Register O1_klass = O1_scratch;  // Interesting AMH data.

       __ load_heap_oop(G3_amh_argument, O1_klass);  // This is a Class object!

       load_klass_from_Class(_masm, O1_klass, O2_scratch, O3_scratch);

       Label L_done;

       __ ld_ptr(vmarg, O2_scratch);

       __ tst(O2_scratch);

       __ brx(Assembler::zero, false, Assembler::pn, L_done);  // No cast if null.

       __ delayed()->nop();

       __ load_klass(O2_scratch, O2_scratch);

       // Live at this point:

       // - O0_argslot      :  argslot index in vmarg; may be required in the failing path

       // - O1_klass        :  klass required by the target method

       // - O2_scratch      :  argument klass to test

       // - G3_method_handle:  adapter method handle

       __ check_klass_subtype(O2_scratch, O1_klass, O3_scratch, O4_scratch, L_done);

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

       __ load_heap_oop(G3_amh_argument,        O2_required);  // required class

       __ ld_ptr(       vmarg,                  O1_actual);    // bad object

       __ jump_to(AddressLiteral(from_interpreted_entry(_raise_exception)), O3_scratch);

       __ delayed()->mov(Bytecodes::_checkcast, O0_code);      // who is complaining?

       __ BIND(L_done);

       // Get the new MH:

       __ load_heap_oop(G3_mh_vmtarget, G3_method_handle);

       __ jump_to_method_handle_entry(G3_method_handle, O1_scratch);

     }

     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.

       load_vmargslot(_masm, G3_amh_vmargslot, O0_argslot);

       Address value;

       Address vmarg;

       bool value_left_justified = false;

       switch (ek) {

       case _adapter_opt_i2i:

         value = vmarg = __ argument_address(O0_argslot, O0_argslot);

         break;

       case _adapter_opt_l2i:

         {

           // just delete the extra slot

 #ifdef _LP64

           // In V9, longs are given 2 64-bit slots in the interpreter, but the

           // data is passed in only 1 slot.

           // Keep the second slot.

           __ add(__ argument_address(O0_argslot, O0_argslot, -1), O0_argslot);

           remove_arg_slots(_masm, -stack_move_unit(), O0_argslot, O1_scratch, O2_scratch, O3_scratch);

           value = Address(O0_argslot, 4);  // Get least-significant 32-bit of 64-bit value.

           vmarg = Address(O0_argslot, Interpreter::stackElementSize);

 #else

           // Keep the first slot.

           __ add(__ argument_address(O0_argslot, O0_argslot), O0_argslot);

           remove_arg_slots(_masm, -stack_move_unit(), O0_argslot, O1_scratch, O2_scratch, O3_scratch);

           value = Address(O0_argslot, 0);

           vmarg = value;

 #endif

         }

         break;

       case _adapter_opt_unboxi:

         {

           vmarg = __ argument_address(O0_argslot, O0_argslot);

           // Load the value up from the heap.

           __ ld_ptr(vmarg, O1_scratch);

           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(O1_scratch, value_offset);

           value = Address(O1_scratch, value_offset);

 #ifdef _BIG_ENDIAN

           // Values stored in objects are packed.

           value_left_justified = true;

 #endif

         }

         break;

       default:

         ShouldNotReachHere();

       }

       // This check is required on _BIG_ENDIAN

       Register G5_vminfo = G5_scratch;

       __ ldsw(G3_amh_conversion, G5_vminfo);

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

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

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

       __ lduw(value, O1_scratch);

       if (!value_left_justified)

         __ sll(O1_scratch, G5_vminfo, O1_scratch);

       Label zero_extend, done;

       __ btst(CONV_VMINFO_SIGN_FLAG, G5_vminfo);

       __ br(Assembler::zero, false, Assembler::pn, zero_extend);

       __ delayed()->nop();

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

       __ sra(O1_scratch, G5_vminfo, O1_scratch);

       __ ba(false, done);

       __ delayed()->nop();

       __ bind(zero_extend);

       // this is taken for int->char

       __ srl(O1_scratch, G5_vminfo, O1_scratch);

       __ bind(done);

       __ st(O1_scratch, vmarg);

       // Get the new MH:

       __ load_heap_oop(G3_mh_vmtarget, G3_method_handle);

       __ jump_to_method_handle_entry(G3_method_handle, O1_scratch);

     }

     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.

       load_vmargslot(_masm, G3_amh_vmargslot, O0_argslot);

       // On big-endian machine we duplicate the slot and store the MSW

       // in the first slot.

       __ add(__ argument_address(O0_argslot, O0_argslot, 1), O0_argslot);

       insert_arg_slots(_masm, stack_move_unit(), O0_argslot, O1_scratch, O2_scratch, O3_scratch);

       Address arg_lsw(O0_argslot, 0);

       Address arg_msw(O0_argslot, -Interpreter::stackElementSize);

       switch (ek) {

       case _adapter_opt_i2l:

         {

 #ifdef _LP64

           __ ldsw(arg_lsw, O2_scratch);                 // Load LSW sign-extended

 #else

           __ ldsw(arg_lsw, O3_scratch);                 // Load LSW sign-extended

           __ srlx(O3_scratch, BitsPerInt, O2_scratch);  // Move MSW value to lower 32-bits for std

 #endif

           __ st_long(O2_scratch, arg_msw);              // Uses O2/O3 on !_LP64

         }

         break;

       case _adapter_opt_unboxl:

         {

           // Load the value up from the heap.

           __ ld_ptr(arg_lsw, O1_scratch);

           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(O1_scratch, value_offset);

           __ ld_long(Address(O1_scratch, value_offset), O2_scratch);  // Uses O2/O3 on !_LP64

           __ st_long(O2_scratch, arg_msw);

         }

         break;

       default:

         ShouldNotReachHere();

       }

       __ load_heap_oop(G3_mh_vmtarget, G3_method_handle);

       __ jump_to_method_handle_entry(G3_method_handle, O1_scratch);

     }

     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

       __ unimplemented(entry_name(ek));

     }

     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_slots = ek_adapter_opt_swap_slots(ek);

       int rotate     = ek_adapter_opt_swap_mode(ek);

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

       load_vmargslot(_masm, G3_amh_vmargslot, O0_argslot);

       __ add(__ argument_address(O0_argslot, O0_argslot), O0_argslot);

       if (VerifyMethodHandles)

         verify_argslot(_masm, O0_argslot, O2_scratch, "swap point must fall within current frame");

       // 'vminfo' is the second.

       Register O1_destslot = O1_scratch;

       load_conversion_vminfo(_masm, G3_amh_conversion, O1_destslot);

       __ add(__ argument_address(O1_destslot, O1_destslot), O1_destslot);

       if (VerifyMethodHandles)

         verify_argslot(_masm, O1_destslot, O2_scratch, "swap point must fall within current frame");

       assert(Interpreter::stackElementSize == wordSize, "else rethink use of wordSize here");

       if (!rotate) {

         // simple swap

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

           __ ld_ptr(            Address(O0_argslot,  i * wordSize), O2_scratch);

           __ ld_ptr(            Address(O1_destslot, i * wordSize), O3_scratch);

           __ st_ptr(O3_scratch, Address(O0_argslot,  i * wordSize));

           __ st_ptr(O2_scratch, Address(O1_destslot, i * wordSize));

         }

       } else {

         // A rotate is actually pair of moves, with an "odd slot" (or pair)

         // changing place with a series of other slots.

         // First, push the "odd slot", which is going to get overwritten

         switch (swap_slots) {

         case 2 :  __ ld_ptr(Address(O0_argslot, 1 * wordSize), O4_scratch); // fall-thru

         case 1 :  __ ld_ptr(Address(O0_argslot, 0 * wordSize), O3_scratch); break;

         default:  ShouldNotReachHere();

         }

         if (rotate > 0) {

           // Here is rotate > 0:

           // (low mem)                                          (high mem)

           //     | dest:     more_slots...     | arg: odd_slot :arg+1 |

           // =>

           //     | dest: odd_slot | dest+1: more_slots...      :arg+1 |

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

           // pseudo-code:

           //   argslot  = src_addr - swap_bytes

           //   destslot = dest_addr

           //   while (argslot >= destslot) *(argslot + swap_bytes) = *(argslot + 0), argslot--;

           move_arg_slots_up(_masm,

                             O1_destslot,

                             Address(O0_argslot, 0),

                             swap_slots,

                             O0_argslot, O2_scratch);

         } else {

           // Here is the other direction, rotate < 0:

           // (low mem)                                          (high mem)

           //     | arg: odd_slot | arg+1: more_slots...       :dest+1 |

           // =>

           //     | arg:    more_slots...     | dest: odd_slot :dest+1 |

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

           // pseudo-code:

           //   argslot  = src_addr + swap_bytes

           //   destslot = dest_addr

           //   while (argslot <= destslot) *(argslot - swap_bytes) = *(argslot + 0), argslot++;

           // dest_slot denotes an exclusive upper limit

           int limit_bias = OP_ROT_ARGS_DOWN_LIMIT_BIAS;

           if (limit_bias != 0)

             __ add(O1_destslot, - limit_bias * wordSize, O1_destslot);

           move_arg_slots_down(_masm,

                               Address(O0_argslot, swap_slots * wordSize),

                               O1_destslot,

                               -swap_slots,

                               O0_argslot, O2_scratch);

           __ sub(O1_destslot, swap_slots * wordSize, O1_destslot);

         }

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

         switch (swap_slots) {

         case 2 :  __ st_ptr(O4_scratch, Address(O1_destslot, 1 * wordSize)); // fall-thru

         case 1 :  __ st_ptr(O3_scratch, Address(O1_destslot, 0 * wordSize)); break;

         default:  ShouldNotReachHere();

         }

       }

       __ load_heap_oop(G3_mh_vmtarget, G3_method_handle);

       __ jump_to_method_handle_entry(G3_method_handle, O1_scratch);

     }

     break;

   case _adapter_dup_args:

     {

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

       load_vmargslot(_masm, G3_amh_vmargslot, O0_argslot);

       __ add(__ argument_address(O0_argslot, O0_argslot), O0_argslot);

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

       Register O1_stack_move = O1_scratch;

       load_stack_move(_masm, G3_amh_conversion, O1_stack_move);

       if (VerifyMethodHandles) {

         verify_argslots(_masm, O1_stack_move, O0_argslot, O2_scratch, O3_scratch, true,

                         "copied argument(s) must fall within current frame");

       }

       // insert location is always the bottom of the argument list:

       __ neg(O1_stack_move);

       push_arg_slots(_masm, O0_argslot, O1_stack_move, O2_scratch, O3_scratch);

       __ load_heap_oop(G3_mh_vmtarget, G3_method_handle);

       __ jump_to_method_handle_entry(G3_method_handle, O1_scratch);

     }

     break;

   case _adapter_drop_args:

     {

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

       load_vmargslot(_masm, G3_amh_vmargslot, O0_argslot);

       __ add(__ argument_address(O0_argslot, O0_argslot), O0_argslot);

       // 'stack_move' is number of words to drop.

       Register O1_stack_move = O1_scratch;

       load_stack_move(_masm, G3_amh_conversion, O1_stack_move);

       remove_arg_slots(_masm, O1_stack_move, O0_argslot, O2_scratch, O3_scratch, O4_scratch);

       __ load_heap_oop(G3_mh_vmtarget, G3_method_handle);

       __ jump_to_method_handle_entry(G3_method_handle, O1_scratch);

     }

     break;

   case _adapter_collect_args:

   case _adapter_fold_args:

   case _adapter_spread_args:

     // Handled completely by optimized cases.

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

     break;

   case _adapter_opt_collect_ref:

   case _adapter_opt_collect_int:

   case _adapter_opt_collect_long:

   case _adapter_opt_collect_float:

   case _adapter_opt_collect_double:

   case _adapter_opt_collect_void:

   case _adapter_opt_collect_0_ref:

   case _adapter_opt_collect_1_ref:

   case _adapter_opt_collect_2_ref:

   case _adapter_opt_collect_3_ref:

   case _adapter_opt_collect_4_ref:

   case _adapter_opt_collect_5_ref:

   case _adapter_opt_filter_S0_ref:

   case _adapter_opt_filter_S1_ref:

   case _adapter_opt_filter_S2_ref:

   case _adapter_opt_filter_S3_ref:

   case _adapter_opt_filter_S4_ref:

   case _adapter_opt_filter_S5_ref:

   case _adapter_opt_collect_2_S0_ref:

   case _adapter_opt_collect_2_S1_ref:

   case _adapter_opt_collect_2_S2_ref:

   case _adapter_opt_collect_2_S3_ref:

   case _adapter_opt_collect_2_S4_ref:

   case _adapter_opt_collect_2_S5_ref:

   case _adapter_opt_fold_ref:

   case _adapter_opt_fold_int:

   case _adapter_opt_fold_long:

   case _adapter_opt_fold_float:

   case _adapter_opt_fold_double:

   case _adapter_opt_fold_void:

   case _adapter_opt_fold_1_ref:

   case _adapter_opt_fold_2_ref:

   case _adapter_opt_fold_3_ref:

   case _adapter_opt_fold_4_ref:

   case _adapter_opt_fold_5_ref:

     {

       // Given a fresh incoming stack frame, build a new ricochet frame.

       // On entry, TOS points at a return PC, and FP is the callers frame ptr.

       // RSI/R13 has the caller's exact stack pointer, which we must also preserve.

       // RCX contains an AdapterMethodHandle of the indicated kind.

       // Relevant AMH fields:

       // amh.vmargslot:

       //   points to the trailing edge of the arguments

       //   to filter, collect, or fold.  For a boxing operation,

       //   it points just after the single primitive value.

       // amh.argument:

       //   recursively called MH, on |collect| arguments

       // amh.vmtarget:

       //   final destination MH, on return value, etc.

       // amh.conversion.dest:

       //   tells what is the type of the return value

       //   (not needed here, since dest is also derived from ek)

       // amh.conversion.vminfo:

       //   points to the trailing edge of the return value

       //   when the vmtarget is to be called; this is

       //   equal to vmargslot + (retained ? |collect| : 0)

       // Pass 0 or more argument slots to the recursive target.

       int collect_count_constant = ek_adapter_opt_collect_count(ek);

       // The collected arguments are copied from the saved argument list:

       int collect_slot_constant = ek_adapter_opt_collect_slot(ek);

       assert(ek_orig == _adapter_collect_args ||

              ek_orig == _adapter_fold_args, "");

       bool retain_original_args = (ek_orig == _adapter_fold_args);

       // The return value is replaced (or inserted) at the 'vminfo' argslot.

       // Sometimes we can compute this statically.

       int dest_slot_constant = -1;

       if (!retain_original_args)

         dest_slot_constant = collect_slot_constant;

       else if (collect_slot_constant >= 0 && collect_count_constant >= 0)

         // We are preserving all the arguments, and the return value is prepended,

         // so the return slot is to the left (above) the |collect| sequence.

         dest_slot_constant = collect_slot_constant + collect_count_constant;

       // Replace all those slots by the result of the recursive call.

       // The result type can be one of ref, int, long, float, double, void.

       // In the case of void, nothing is pushed on the stack after return.

       BasicType dest = ek_adapter_opt_collect_type(ek);

       assert(dest == type2wfield[dest], "dest is a stack slot type");

       int dest_count = type2size[dest];

       assert(dest_count == 1 || dest_count == 2 || (dest_count == 0 && dest == T_VOID), "dest has a size");

       // Choose a return continuation.

       EntryKind ek_ret = _adapter_opt_return_any;

       if (dest != T_CONFLICT && OptimizeMethodHandles) {

         switch (dest) {

         case T_INT    : ek_ret = _adapter_opt_return_int;     break;

         case T_LONG   : ek_ret = _adapter_opt_return_long;    break;

         case T_FLOAT  : ek_ret = _adapter_opt_return_float;   break;

         case T_DOUBLE : ek_ret = _adapter_opt_return_double;  break;

         case T_OBJECT : ek_ret = _adapter_opt_return_ref;     break;

         case T_VOID   : ek_ret = _adapter_opt_return_void;    break;

         default       : ShouldNotReachHere();

         }

         if (dest == T_OBJECT && dest_slot_constant >= 0) {

           EntryKind ek_try = EntryKind(_adapter_opt_return_S0_ref + dest_slot_constant);

           if (ek_try <= _adapter_opt_return_LAST &&

               ek_adapter_opt_return_slot(ek_try) == dest_slot_constant) {

             ek_ret = ek_try;

           }

         }

         assert(ek_adapter_opt_return_type(ek_ret) == dest, "");

       }

       // Already pushed:  ... keep1 | collect | keep2 |

       // Push a few extra argument words, if we need them to store the return value.

       {

         int extra_slots = 0;

         if (retain_original_args) {

           extra_slots = dest_count;

         } else if (collect_count_constant == -1) {

           extra_slots = dest_count;  // collect_count might be zero; be generous

         } else if (dest_count > collect_count_constant) {

           extra_slots = (dest_count - collect_count_constant);

         } else {

           // else we know we have enough dead space in |collect| to repurpose for return values

         }

         if (extra_slots != 0) {

           __ sub(SP, round_to(extra_slots, 2) * Interpreter::stackElementSize, SP);

         }

       }

       // Set up Ricochet Frame.

       __ mov(SP, O5_savedSP);  // record SP for the callee

       // One extra (empty) slot for outgoing target MH (see Gargs computation below).

       __ save_frame(2);  // Note: we need to add 2 slots since frame::memory_parameter_word_sp_offset is 23.

       // Note: Gargs is live throughout the following, until we make our recursive call.

       // And the RF saves a copy in L4_saved_args_base.

       RicochetFrame::enter_ricochet_frame(_masm, G3_method_handle, Gargs,

                                           entry(ek_ret)->from_interpreted_entry());

       // Compute argument base:

       // Set up Gargs for current frame, extra (empty) slot is for outgoing target MH (space reserved by save_frame above).

       __ add(FP, STACK_BIAS - (1 * Interpreter::stackElementSize), Gargs);

       // Now pushed:  ... keep1 | collect | keep2 | extra | [RF]

 #ifdef ASSERT

       if (VerifyMethodHandles && dest != T_CONFLICT) {

         BLOCK_COMMENT("verify AMH.conv.dest {");

         extract_conversion_dest_type(_masm, RicochetFrame::L5_conversion, O1_scratch);

         Label L_dest_ok;

         __ cmp(O1_scratch, (int) dest);

         __ br(Assembler::equal, false, Assembler::pt, L_dest_ok);

         __ delayed()->nop();

         if (dest == T_INT) {

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

             if (is_subword_type(BasicType(bt))) {

               __ cmp(O1_scratch, (int) bt);

               __ br(Assembler::equal, false, Assembler::pt, L_dest_ok);

               __ delayed()->nop();

             }

           }

         }

         __ stop("bad dest in AMH.conv");

         __ BIND(L_dest_ok);

         BLOCK_COMMENT("} verify AMH.conv.dest");

       }

 #endif //ASSERT

       // Find out where the original copy of the recursive argument sequence begins.

       Register O0_coll = O0_scratch;

       {

         RegisterOrConstant collect_slot = collect_slot_constant;

         if (collect_slot_constant == -1) {

           load_vmargslot(_masm, G3_amh_vmargslot, O1_scratch);

           collect_slot = O1_scratch;

         }

         // collect_slot might be 0, but we need the move anyway.

         __ add(RicochetFrame::L4_saved_args_base, __ argument_offset(collect_slot, collect_slot.register_or_noreg()), O0_coll);

         // O0_coll now points at the trailing edge of |collect| and leading edge of |keep2|

       }

       // Replace the old AMH with the recursive MH.  (No going back now.)

       // In the case of a boxing call, the recursive call is to a 'boxer' method,

       // such as Integer.valueOf or Long.valueOf.  In the case of a filter

       // or collect call, it will take one or more arguments, transform them,

       // and return some result, to store back into argument_base[vminfo].

       __ load_heap_oop(G3_amh_argument, G3_method_handle);

       if (VerifyMethodHandles)  verify_method_handle(_masm, G3_method_handle, O1_scratch, O2_scratch);

       // Calculate |collect|, the number of arguments we are collecting.

       Register O1_collect_count = O1_scratch;

       RegisterOrConstant collect_count;

       if (collect_count_constant < 0) {

         __ load_method_handle_vmslots(O1_collect_count, G3_method_handle, O2_scratch);

         collect_count = O1_collect_count;

       } else {

         collect_count = collect_count_constant;

 #ifdef ASSERT

         if (VerifyMethodHandles) {

           BLOCK_COMMENT("verify collect_count_constant {");

           __ load_method_handle_vmslots(O3_scratch, G3_method_handle, O2_scratch);

           Label L_count_ok;

           __ cmp(O3_scratch, collect_count_constant);

           __ br(Assembler::equal, false, Assembler::pt, L_count_ok);

           __ delayed()->nop();

           __ stop("bad vminfo in AMH.conv");

           __ BIND(L_count_ok);

           BLOCK_COMMENT("} verify collect_count_constant");

         }

 #endif //ASSERT

       }

       // copy |collect| slots directly to TOS:

       push_arg_slots(_masm, O0_coll, collect_count, O2_scratch, O3_scratch);

       // Now pushed:  ... keep1 | collect | keep2 | RF... | collect |

       // O0_coll still points at the trailing edge of |collect| and leading edge of |keep2|

       // If necessary, adjust the saved arguments to make room for the eventual return value.

       // Normal adjustment:  ... keep1 | +dest+ | -collect- | keep2 | RF... | collect |

       // If retaining args:  ... keep1 | +dest+ |  collect  | keep2 | RF... | collect |

       // In the non-retaining case, this might move keep2 either up or down.

       // We don't have to copy the whole | RF... collect | complex,

       // but we must adjust RF.saved_args_base.

       // Also, from now on, we will forget about the original copy of |collect|.

       // If we are retaining it, we will treat it as part of |keep2|.

       // For clarity we will define |keep3| = |collect|keep2| or |keep2|.

       BLOCK_COMMENT("adjust trailing arguments {");

       // Compare the sizes of |+dest+| and |-collect-|, which are opposed opening and closing movements.

       int                open_count  = dest_count;

       RegisterOrConstant close_count = collect_count_constant;

       Register O1_close_count = O1_collect_count;

       if (retain_original_args) {

         close_count = constant(0);

       } else if (collect_count_constant == -1) {

         close_count = O1_collect_count;

       }

       // How many slots need moving?  This is simply dest_slot (0 => no |keep3|).

       RegisterOrConstant keep3_count;

       Register O2_keep3_count = O2_scratch;

       if (dest_slot_constant < 0) {

         extract_conversion_vminfo(_masm, RicochetFrame::L5_conversion, O2_keep3_count);

         keep3_count = O2_keep3_count;

       } else  {

         keep3_count = dest_slot_constant;

 #ifdef ASSERT

         if (VerifyMethodHandles && dest_slot_constant < 0) {

           BLOCK_COMMENT("verify dest_slot_constant {");

           extract_conversion_vminfo(_masm, RicochetFrame::L5_conversion, O3_scratch);

           Label L_vminfo_ok;

           __ cmp(O3_scratch, dest_slot_constant);

           __ br(Assembler::equal, false, Assembler::pt, L_vminfo_ok);

           __ delayed()->nop();

           __ stop("bad vminfo in AMH.conv");

           __ BIND(L_vminfo_ok);

           BLOCK_COMMENT("} verify dest_slot_constant");

         }

 #endif //ASSERT

       }

       // tasks remaining:

       bool move_keep3 = (!keep3_count.is_constant() || keep3_count.as_constant() != 0);

       bool stomp_dest = (NOT_DEBUG(dest == T_OBJECT) DEBUG_ONLY(dest_count != 0));

       bool fix_arg_base = (!close_count.is_constant() || open_count != close_count.as_constant());

       // Old and new argument locations (based at slot 0).

       // Net shift (&new_argv - &old_argv) is (close_count - open_count).

       bool zero_open_count = (open_count == 0);  // remember this bit of info

       if (move_keep3 && fix_arg_base) {

         // It will be easier to have everything in one register:

         if (close_count.is_register()) {

           // Deduct open_count from close_count register to get a clean +/- value.

           __ sub(close_count.as_register(), open_count, close_count.as_register());

         } else {

           close_count = close_count.as_constant() - open_count;

         }

         open_count = 0;

       }

       Register L4_old_argv = RicochetFrame::L4_saved_args_base;

       Register O3_new_argv = O3_scratch;

       if (fix_arg_base) {

         __ add(L4_old_argv, __ argument_offset(close_count, O4_scratch), O3_new_argv,

                -(open_count * Interpreter::stackElementSize));

       }

       // First decide if any actual data are to be moved.

       // We can skip if (a) |keep3| is empty, or (b) the argument list size didn't change.

       // (As it happens, all movements involve an argument list size change.)

       // If there are variable parameters, use dynamic checks to skip around the whole mess.

       Label L_done;

       if (keep3_count.is_register()) {

         __ tst(keep3_count.as_register());

         __ br(Assembler::zero, false, Assembler::pn, L_done);

         __ delayed()->nop();

       }

       if (close_count.is_register()) {

         __ cmp(close_count.as_register(), open_count);

         __ br(Assembler::equal, false, Assembler::pn, L_done);

         __ delayed()->nop();

       }

       if (move_keep3 && fix_arg_base) {

         bool emit_move_down = false, emit_move_up = false, emit_guard = false;

         if (!close_count.is_constant()) {

           emit_move_down = emit_guard = !zero_open_count;

           emit_move_up   = true;

         } else if (open_count != close_count.as_constant()) {

           emit_move_down = (open_count > close_count.as_constant());

           emit_move_up   = !emit_move_down;

         }

         Label L_move_up;

         if (emit_guard) {

           __ cmp(close_count.as_register(), open_count);

           __ br(Assembler::greater, false, Assembler::pn, L_move_up);

           __ delayed()->nop();

         }

         if (emit_move_down) {

           // Move arguments down if |+dest+| > |-collect-|

           // (This is rare, except when arguments are retained.)

           // This opens space for the return value.

           if (keep3_count.is_constant()) {

             for (int i = 0; i < keep3_count.as_constant(); i++) {

               __ ld_ptr(            Address(L4_old_argv, i * Interpreter::stackElementSize), O4_scratch);

               __ st_ptr(O4_scratch, Address(O3_new_argv, i * Interpreter::stackElementSize)            );

             }

           } else {

             // Live: O1_close_count, O2_keep3_count, O3_new_argv

             Register argv_top = O0_scratch;

             __ add(L4_old_argv, __ argument_offset(keep3_count, O4_scratch), argv_top);

             move_arg_slots_down(_masm,

                                 Address(L4_old_argv, 0),  // beginning of old argv

                                 argv_top,                 // end of old argv

                                 close_count,              // distance to move down (must be negative)

                                 O4_scratch, G5_scratch);

           }

         }

         if (emit_guard) {

           __ ba(false, L_done);  // assumes emit_move_up is true also

           __ delayed()->nop();

           __ BIND(L_move_up);

         }

         if (emit_move_up) {

           // Move arguments up if |+dest+| < |-collect-|

           // (This is usual, except when |keep3| is empty.)

           // This closes up the space occupied by the now-deleted collect values.

           if (keep3_count.is_constant()) {

             for (int i = keep3_count.as_constant() - 1; i >= 0; i--) {

               __ ld_ptr(            Address(L4_old_argv, i * Interpreter::stackElementSize), O4_scratch);

               __ st_ptr(O4_scratch, Address(O3_new_argv, i * Interpreter::stackElementSize)            );

             }

           } else {

             Address argv_top(L4_old_argv, __ argument_offset(keep3_count, O4_scratch));

             // Live: O1_close_count, O2_keep3_count, O3_new_argv

             move_arg_slots_up(_masm,

                               L4_old_argv,  // beginning of old argv

                               argv_top,     // end of old argv

                               close_count,  // distance to move up (must be positive)

                               O4_scratch, G5_scratch);

           }

         }

       }

       __ BIND(L_done);

       if (fix_arg_base) {

         // adjust RF.saved_args_base

         __ mov(O3_new_argv, RicochetFrame::L4_saved_args_base);

       }

       if (stomp_dest) {

         // Stomp the return slot, so it doesn't hold garbage.

         // This isn't strictly necessary, but it may help detect bugs.

         __ set(RicochetFrame::RETURN_VALUE_PLACEHOLDER, O4_scratch);

         __ st_ptr(O4_scratch, Address(RicochetFrame::L4_saved_args_base,

                                       __ argument_offset(keep3_count, keep3_count.register_or_noreg())));  // uses O2_keep3_count

       }

       BLOCK_COMMENT("} adjust trailing arguments");

       BLOCK_COMMENT("do_recursive_call");

       __ mov(SP, O5_savedSP);  // record SP for the callee

       __ set(ExternalAddress(SharedRuntime::ricochet_blob()->bounce_addr() - frame::pc_return_offset), O7);

       // The globally unique bounce address has two purposes:

       // 1. It helps the JVM recognize this frame (frame::is_ricochet_frame).

       // 2. When returned to, it cuts back the stack and redirects control flow

       //    to the return handler.

       // The return handler will further cut back the stack when it takes

       // down the RF.  Perhaps there is a way to streamline this further.

       // State during recursive call:

       // ... keep1 | dest | dest=42 | keep3 | RF... | collect | bounce_pc |

       __ jump_to_method_handle_entry(G3_method_handle, O1_scratch);

     }

     break;

   case _adapter_opt_return_ref:

   case _adapter_opt_return_int:

   case _adapter_opt_return_long:

   case _adapter_opt_return_float:

   case _adapter_opt_return_double:

   case _adapter_opt_return_void:

   case _adapter_opt_return_S0_ref:

   case _adapter_opt_return_S1_ref:

   case _adapter_opt_return_S2_ref:

   case _adapter_opt_return_S3_ref:

   case _adapter_opt_return_S4_ref:

   case _adapter_opt_return_S5_ref:

     {

       BasicType dest_type_constant = ek_adapter_opt_return_type(ek);

       int       dest_slot_constant = ek_adapter_opt_return_slot(ek);

       if (VerifyMethodHandles)  RicochetFrame::verify_clean(_masm);

       if (dest_slot_constant == -1) {

         // The current stub is a general handler for this dest_type.

         // It can be called from _adapter_opt_return_any below.

         // Stash the address in a little table.

         assert((dest_type_constant & CONV_TYPE_MASK) == dest_type_constant, "oob");

         address return_handler = __ pc();

         _adapter_return_handlers[dest_type_constant] = return_handler;

         if (dest_type_constant == T_INT) {

           // do the subword types too

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

             if (is_subword_type(BasicType(bt)) &&

                 _adapter_return_handlers[bt] == NULL) {

               _adapter_return_handlers[bt] = return_handler;

             }

           }

         }

       }

       // On entry to this continuation handler, make Gargs live again.

       __ mov(RicochetFrame::L4_saved_args_base, Gargs);

       Register O7_temp   = O7;

       Register O5_vminfo = O5;

       RegisterOrConstant dest_slot = dest_slot_constant;

       if (dest_slot_constant == -1) {

         extract_conversion_vminfo(_masm, RicochetFrame::L5_conversion, O5_vminfo);

         dest_slot = O5_vminfo;

       }

       // Store the result back into the argslot.

       // This code uses the interpreter calling sequence, in which the return value

       // is usually left in the TOS register, as defined by InterpreterMacroAssembler::pop.

       // There are certain irregularities with floating point values, which can be seen

       // in TemplateInterpreterGenerator::generate_return_entry_for.

       move_return_value(_masm, dest_type_constant, __ argument_address(dest_slot, O7_temp));

       RicochetFrame::leave_ricochet_frame(_masm, G3_method_handle, I5_savedSP, I7);

       // Load the final target and go.

       if (VerifyMethodHandles)  verify_method_handle(_masm, G3_method_handle, O0_scratch, O1_scratch);

       __ restore(I5_savedSP, G0, SP);

       __ jump_to_method_handle_entry(G3_method_handle, O0_scratch);

       __ illtrap(0);

     }

     break;

   case _adapter_opt_return_any:

     {

       Register O7_temp      = O7;

       Register O5_dest_type = O5;

       if (VerifyMethodHandles)  RicochetFrame::verify_clean(_masm);

       extract_conversion_dest_type(_masm, RicochetFrame::L5_conversion, O5_dest_type);

       __ set(ExternalAddress((address) &_adapter_return_handlers[0]), O7_temp);

       __ sll_ptr(O5_dest_type, LogBytesPerWord, O5_dest_type);

       __ ld_ptr(O7_temp, O5_dest_type, O7_temp);

 #ifdef ASSERT

       { Label L_ok;

         __ br_notnull(O7_temp, false, Assembler::pt, L_ok);

         __ delayed()->nop();

         __ stop("bad method handle return");

         __ BIND(L_ok);

       }

 #endif //ASSERT

       __ JMP(O7_temp, 0);

       __ delayed()->nop();

     }

     break;

   case _adapter_opt_spread_0:

   case _adapter_opt_spread_1_ref:

   case _adapter_opt_spread_2_ref:

   case _adapter_opt_spread_3_ref:

   case _adapter_opt_spread_4_ref:

   case _adapter_opt_spread_5_ref:

   case _adapter_opt_spread_ref:

   case _adapter_opt_spread_byte:

   case _adapter_opt_spread_char:

   case _adapter_opt_spread_short:

   case _adapter_opt_spread_int:

   case _adapter_opt_spread_long:

   case _adapter_opt_spread_float:

   case _adapter_opt_spread_double:

     {

       // spread an array out into a group of arguments

       int  length_constant    = ek_adapter_opt_spread_count(ek);

       bool length_can_be_zero = (length_constant == 0);

       if (length_constant < 0) {

         // some adapters with variable length must handle the zero case

         if (!OptimizeMethodHandles ||

             ek_adapter_opt_spread_type(ek) != T_OBJECT)

           length_can_be_zero = true;

       }

       // find the address of the array argument

       load_vmargslot(_masm, G3_amh_vmargslot, O0_argslot);

       __ add(__ argument_address(O0_argslot, O0_argslot), O0_argslot);

       // O0_argslot points both to the array and to the first output arg

       Address vmarg = Address(O0_argslot, 0);

       // Get the array value.

       Register  O1_array       = O1_scratch;

       Register  O2_array_klass = O2_scratch;

       BasicType elem_type      = ek_adapter_opt_spread_type(ek);

       int       elem_slots     = type2size[elem_type];  // 1 or 2

       int       array_slots    = 1;  // array is always a T_OBJECT

       int       length_offset  = arrayOopDesc::length_offset_in_bytes();

       int       elem0_offset   = arrayOopDesc::base_offset_in_bytes(elem_type);

       __ ld_ptr(vmarg, O1_array);

       Label L_array_is_empty, L_insert_arg_space, L_copy_args, L_args_done;

       if (length_can_be_zero) {

         // handle the null pointer case, if zero is allowed

         Label L_skip;

         if (length_constant < 0) {

           load_conversion_vminfo(_masm, G3_amh_conversion, O3_scratch);

           __ br_zero(Assembler::notZero, false, Assembler::pn, O3_scratch, L_skip);

           __ delayed()->nop();

         }

         __ br_null(O1_array, false, Assembler::pn, L_array_is_empty);

         __ delayed()->nop();

         __ BIND(L_skip);

       }

       __ null_check(O1_array, oopDesc::klass_offset_in_bytes());

       __ load_klass(O1_array, O2_array_klass);

       // Check the array type.

       Register O3_klass = O3_scratch;

       __ load_heap_oop(G3_amh_argument, O3_klass);  // this is a Class object!

       load_klass_from_Class(_masm, O3_klass, O4_scratch, G5_scratch);

       Label L_ok_array_klass, L_bad_array_klass, L_bad_array_length;

       __ check_klass_subtype(O2_array_klass, O3_klass, O4_scratch, G5_scratch, L_ok_array_klass);

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

       __ ba(false, L_bad_array_klass);

       __ delayed()->nop();

       __ BIND(L_ok_array_klass);

       // Check length.

       if (length_constant >= 0) {

         __ ldsw(Address(O1_array, length_offset), O4_scratch);

         __ cmp(O4_scratch, length_constant);

       } else {

         Register O3_vminfo = O3_scratch;

         load_conversion_vminfo(_masm, G3_amh_conversion, O3_vminfo);

         __ ldsw(Address(O1_array, length_offset), O4_scratch);

         __ cmp(O3_vminfo, O4_scratch);

       }

       __ br(Assembler::notEqual, false, Assembler::pn, L_bad_array_length);

       __ delayed()->nop();

       Register O2_argslot_limit = O2_scratch;

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

       if (length_constant == -1) {

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

         __ add(O0_argslot, Interpreter::stackElementSize, O2_argslot_limit);

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

         // This number already accounts for elem_slots.

         Register O3_stack_move = O3_scratch;

         load_stack_move(_masm, G3_amh_conversion, O3_stack_move);

         __ cmp(O3_stack_move, 0);

         assert(stack_move_unit() < 0, "else change this comparison");

         __ br(Assembler::less, false, Assembler::pn, L_insert_arg_space);

         __ delayed()->nop();

         __ br(Assembler::equal, false, Assembler::pn, L_copy_args);

         __ delayed()->nop();

         // single argument case, with no array movement

         __ BIND(L_array_is_empty);

         remove_arg_slots(_masm, -stack_move_unit() * array_slots,

                          O0_argslot, O1_scratch, O2_scratch, O3_scratch);

         __ ba(false, L_args_done);  // no spreading to do

         __ delayed()->nop();

         __ BIND(L_insert_arg_space);

         // come here in the usual case, stack_move < 0 (2 or more spread arguments)

         // Live: O1_array, O2_argslot_limit, O3_stack_move

         insert_arg_slots(_masm, O3_stack_move,

                          O0_argslot, O4_scratch, G5_scratch, O1_scratch);

         // reload from rdx_argslot_limit since rax_argslot is now decremented

         __ ld_ptr(Address(O2_argslot_limit, -Interpreter::stackElementSize), O1_array);

       } else if (length_constant >= 1) {

         int new_slots = (length_constant * elem_slots) - array_slots;

         insert_arg_slots(_masm, new_slots * stack_move_unit(),

                          O0_argslot, O2_scratch, O3_scratch, O4_scratch);

       } else if (length_constant == 0) {

         __ BIND(L_array_is_empty);

         remove_arg_slots(_masm, -stack_move_unit() * array_slots,

                          O0_argslot, O1_scratch, O2_scratch, O3_scratch);

       } else {

         ShouldNotReachHere();

       }

       // Copy from the array to the new slots.

       // Note: Stack change code preserves integrity of O0_argslot pointer.

       // So even after slot insertions, O0_argslot still points to first argument.

       // Beware:  Arguments that are shallow on the stack are deep in the array,

       // and vice versa.  So a downward-growing stack (the usual) has to be copied

       // elementwise in reverse order from the source array.

       __ BIND(L_copy_args);

       if (length_constant == -1) {

         // [O0_argslot, O2_argslot_limit) is the area we are inserting into.

         // Array element [0] goes at O0_argslot_limit[-wordSize].

         Register O1_source = O1_array;

         __ add(Address(O1_array, elem0_offset), O1_source);

         Register O4_fill_ptr = O4_scratch;

         __ mov(O2_argslot_limit, O4_fill_ptr);

         Label L_loop;

         __ BIND(L_loop);

         __ add(O4_fill_ptr, -Interpreter::stackElementSize * elem_slots, O4_fill_ptr);

         move_typed_arg(_masm, elem_type, true,

                        Address(O1_source, 0), Address(O4_fill_ptr, 0),

                        O2_scratch);  // must be an even register for !_LP64 long moves (uses O2/O3)

         __ add(O1_source, type2aelembytes(elem_type), O1_source);

         __ cmp(O4_fill_ptr, O0_argslot);

         __ brx(Assembler::greaterUnsigned, false, Assembler::pt, L_loop);

         __ delayed()->nop();  // FILLME

       } else if (length_constant == 0) {

         // nothing to copy

       } else {

         int elem_offset = elem0_offset;

         int slot_offset = length_constant * Interpreter::stackElementSize;

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

           slot_offset -= Interpreter::stackElementSize * elem_slots;  // fill backward

           move_typed_arg(_masm, elem_type, true,

                          Address(O1_array, elem_offset), Address(O0_argslot, slot_offset),

                          O2_scratch);  // must be an even register for !_LP64 long moves (uses O2/O3)

           elem_offset += type2aelembytes(elem_type);

         }

       }

       __ BIND(L_args_done);

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

       __ load_heap_oop(G3_mh_vmtarget, G3_method_handle);

       __ jump_to_method_handle_entry(G3_method_handle, O1_scratch);

       __ BIND(L_bad_array_klass);

       assert(!vmarg.uses(O2_required), "must be different registers");

       __ load_heap_oop(Address(O2_array_klass, java_mirror_offset), O2_required);  // required class

       __ ld_ptr(       vmarg,                                       O1_actual);    // bad object

       __ jump_to(AddressLiteral(from_interpreted_entry(_raise_exception)), O3_scratch);

       __ delayed()->mov(Bytecodes::_aaload,                         O0_code);      // who is complaining?

       __ bind(L_bad_array_length);

       assert(!vmarg.uses(O2_required), "must be different registers");

       __ mov(   G3_method_handle,                O2_required);  // required class

       __ ld_ptr(vmarg,                           O1_actual);    // bad object

       __ jump_to(AddressLiteral(from_interpreted_entry(_raise_exception)), O3_scratch);

       __ delayed()->mov(Bytecodes::_arraylength, O0_code);      // who is complaining?

     }

     break;

   default:

     DEBUG_ONLY(tty->print_cr("bad ek=%d (%s)", (int)ek, entry_name(ek)));

     ShouldNotReachHere();

   }

   BLOCK_COMMENT(err_msg("} Entry %s", entry_name(ek)));

   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));

 }