jdk8-mips64-public/hotspot: src/share/vm/prims/methodHandleWalk.cpp@94ec88ca68e2 (annotated)

src/share/vm/prims/methodHandleWalk.cpp@94ec88ca68e2 (annotated)

src/share/vm/prims/methodHandleWalk.cpp

Wed, 11 Jan 2012 17:34:02 -0500

author: phh
date: Wed, 11 Jan 2012 17:34:02 -0500
changeset 3427: 94ec88ca68e2
parent 3198: a786fdc79c5f
child 3917: 8150fa46d2ed
permissions: -rw-r--r--

7115199: Add event tracing hooks and Java Flight Recorder infrastructure
Summary: Added a nop tracing infrastructure, JFR makefile changes and other infrastructure used only by JFR.
Reviewed-by: acorn, sspitsyn
Contributed-by: markus.gronlund@oracle.com

 /*
  * 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.
  *
  */
 #include "precompiled.hpp"
 #include "interpreter/rewriter.hpp"
 #include "memory/oopFactory.hpp"
 #include "prims/methodHandleWalk.hpp"
 /*
  * JSR 292 reference implementation: method handle structure analysis
  */
 #ifdef PRODUCT
 #define print_method_handle(mh) {}
 #else //PRODUCT
 extern "C" void print_method_handle(oop mh);
 #endif //PRODUCT
 // -----------------------------------------------------------------------------
 // MethodHandleChain
 void MethodHandleChain::set_method_handle(Handle mh, TRAPS) {
   if (!java_lang_invoke_MethodHandle::is_instance(mh()))  lose("bad method handle", CHECK);
   // set current method handle and unpack partially
   _method_handle = mh;
   _is_last       = false;
   _is_bound      = false;
   _arg_slot      = -1;
   _arg_type      = T_VOID;
   _conversion    = -1;
   _last_invoke   = Bytecodes::_nop;  //arbitrary non-garbage
   if (java_lang_invoke_DirectMethodHandle::is_instance(mh())) {
     set_last_method(mh(), THREAD);
     return;
   }
   if (java_lang_invoke_AdapterMethodHandle::is_instance(mh())) {
     _conversion = AdapterMethodHandle_conversion();
     assert(_conversion != -1, "bad conv value");
     assert(java_lang_invoke_BoundMethodHandle::is_instance(mh()), "also BMH");
   }
   if (java_lang_invoke_BoundMethodHandle::is_instance(mh())) {
     if (!is_adapter())          // keep AMH and BMH separate in this model
       _is_bound = true;
     _arg_slot = BoundMethodHandle_vmargslot();
     oop target = MethodHandle_vmtarget_oop();
     if (!is_bound() || java_lang_invoke_MethodHandle::is_instance(target)) {
       _arg_type = compute_bound_arg_type(target, NULL, _arg_slot, CHECK);
     } else if (target != NULL && target->is_method()) {
       methodOop m = (methodOop) target;
       _arg_type = compute_bound_arg_type(NULL, m, _arg_slot, CHECK);
       set_last_method(mh(), CHECK);
     } else {
       _is_bound = false;  // lose!
     }
   }
   if (is_bound() && _arg_type == T_VOID) {
     lose("bad vmargslot", CHECK);
   }
   if (!is_bound() && !is_adapter()) {
     lose("unrecognized MH type", CHECK);
   }
 }
 void MethodHandleChain::set_last_method(oop target, TRAPS) {
   _is_last = true;
   KlassHandle receiver_limit; int flags = 0;
   _last_method = MethodHandles::decode_method(target, receiver_limit, flags);
   if ((flags & MethodHandles::_dmf_has_receiver) == 0)
     _last_invoke = Bytecodes::_invokestatic;
   else if ((flags & MethodHandles::_dmf_does_dispatch) == 0)
     _last_invoke = Bytecodes::_invokespecial;
   else if ((flags & MethodHandles::_dmf_from_interface) != 0)
     _last_invoke = Bytecodes::_invokeinterface;
   else
     _last_invoke = Bytecodes::_invokevirtual;
 }
 BasicType MethodHandleChain::compute_bound_arg_type(oop target, methodOop m, int arg_slot, TRAPS) {
   // There is no direct indication of whether the argument is primitive or not.
   // It is implied by the _vmentry code, and by the MethodType of the target.
   BasicType arg_type = T_VOID;
   if (target != NULL) {
     oop mtype = java_lang_invoke_MethodHandle::type(target);
     int arg_num = MethodHandles::argument_slot_to_argnum(mtype, arg_slot);
     if (arg_num >= 0) {
       oop ptype = java_lang_invoke_MethodType::ptype(mtype, arg_num);
       arg_type = java_lang_Class::as_BasicType(ptype);
     }
   } else if (m != NULL) {
     // figure out the argument type from the slot
     // FIXME: make this explicit in the MH
     int cur_slot = m->size_of_parameters();
     if (arg_slot >= cur_slot)
       return T_VOID;
     if (!m->is_static()) {
       cur_slot -= type2size[T_OBJECT];
       if (cur_slot == arg_slot)
         return T_OBJECT;
     }
     ResourceMark rm(THREAD);
     for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) {
       BasicType bt = ss.type();
       cur_slot -= type2size[bt];
       if (cur_slot <= arg_slot) {
         if (cur_slot == arg_slot)
           arg_type = bt;
         break;
       }
     }
   }
   if (arg_type == T_ARRAY)
     arg_type = T_OBJECT;
   return arg_type;
 }
 void MethodHandleChain::lose(const char* msg, TRAPS) {
   _lose_message = msg;
 #ifdef ASSERT
   if (Verbose) {
     tty->print_cr(INTPTR_FORMAT " lose: %s", _method_handle(), msg);
     print();
   }
 #endif
   if (!THREAD->is_Java_thread() || ((JavaThread*)THREAD)->thread_state() != _thread_in_vm) {
     // throw a preallocated exception
     THROW_OOP(Universe::virtual_machine_error_instance());
   }
   THROW_MSG(vmSymbols::java_lang_InternalError(), msg);
 }
 #ifdef ASSERT
 static const char* adapter_ops[] = {
   "retype_only"  ,
   "retype_raw"   ,
   "check_cast"   ,
   "prim_to_prim" ,
   "ref_to_prim"  ,
   "prim_to_ref"  ,
   "swap_args"    ,
   "rot_args"     ,
   "dup_args"     ,
   "drop_args"    ,
   "collect_args" ,
   "spread_args"  ,
   "fold_args"
 };
 static const char* adapter_op_to_string(int op) {
   if (op >= 0 && op < (int)ARRAY_SIZE(adapter_ops))
     return adapter_ops[op];
   return "unknown_op";
 }
 void MethodHandleChain::print(oopDesc* m) {
   HandleMark hm;
   ResourceMark rm;
   Handle mh(m);
   EXCEPTION_MARK;
   MethodHandleChain mhc(mh, THREAD);
   if (HAS_PENDING_EXCEPTION) {
     oop ex = THREAD->pending_exception();
     CLEAR_PENDING_EXCEPTION;
     ex->print();
     return;
   }
   mhc.print();
 }
 void MethodHandleChain::print() {
   EXCEPTION_MARK;
   print_impl(THREAD);
   if (HAS_PENDING_EXCEPTION) {
     oop ex = THREAD->pending_exception();
     CLEAR_PENDING_EXCEPTION;
     ex->print();
   }
 }
 void MethodHandleChain::print_impl(TRAPS) {
   ResourceMark rm;
   MethodHandleChain chain(_root, CHECK);
   for (;;) {
     tty->print(INTPTR_FORMAT ": ", chain.method_handle()());
     if (chain.is_bound()) {
       tty->print("bound: arg_type %s arg_slot %d",
                  type2name(chain.bound_arg_type()),
                  chain.bound_arg_slot());
       oop o = chain.bound_arg_oop();
       if (o != NULL) {
         if (o->is_instance()) {
           tty->print(" instance %s", o->klass()->klass_part()->internal_name());
           if (java_lang_invoke_CountingMethodHandle::is_instance(o)) {
             tty->print(" vmcount: %d", java_lang_invoke_CountingMethodHandle::vmcount(o));
           }
         } else {
           o->print();
         }
       }
       oop vmt = chain.vmtarget_oop();
       if (vmt != NULL) {
         if (vmt->is_method()) {
           tty->print(" ");
           methodOop(vmt)->print_short_name(tty);
         } else if (java_lang_invoke_MethodHandle::is_instance(vmt)) {
           tty->print(" method handle " INTPTR_FORMAT, vmt);
         } else {
           ShouldNotReachHere();
         }
       }
     } else if (chain.is_adapter()) {
       tty->print("adapter: arg_slot %d conversion op %s",
                  chain.adapter_arg_slot(),
                  adapter_op_to_string(chain.adapter_conversion_op()));
       switch (chain.adapter_conversion_op()) {
         case java_lang_invoke_AdapterMethodHandle::OP_RETYPE_ONLY:
           if (java_lang_invoke_CountingMethodHandle::is_instance(chain.method_handle_oop())) {
             tty->print(" vmcount: %d", java_lang_invoke_CountingMethodHandle::vmcount(chain.method_handle_oop()));
           }
         case java_lang_invoke_AdapterMethodHandle::OP_RETYPE_RAW:
         case java_lang_invoke_AdapterMethodHandle::OP_CHECK_CAST:
         case java_lang_invoke_AdapterMethodHandle::OP_PRIM_TO_PRIM:
         case java_lang_invoke_AdapterMethodHandle::OP_REF_TO_PRIM:
           break;
         case java_lang_invoke_AdapterMethodHandle::OP_PRIM_TO_REF: {
           tty->print(" src_type = %s", type2name(chain.adapter_conversion_src_type()));
           break;
         }
         case java_lang_invoke_AdapterMethodHandle::OP_SWAP_ARGS:
         case java_lang_invoke_AdapterMethodHandle::OP_ROT_ARGS: {
           int dest_arg_slot = chain.adapter_conversion_vminfo();
           tty->print(" dest_arg_slot %d type %s", dest_arg_slot, type2name(chain.adapter_conversion_src_type()));
           break;
         }
         case java_lang_invoke_AdapterMethodHandle::OP_DUP_ARGS:
         case java_lang_invoke_AdapterMethodHandle::OP_DROP_ARGS: {
           int dup_slots = chain.adapter_conversion_stack_pushes();
           tty->print(" pushes %d", dup_slots);
           break;
         }
         case java_lang_invoke_AdapterMethodHandle::OP_FOLD_ARGS:
         case java_lang_invoke_AdapterMethodHandle::OP_COLLECT_ARGS: {
           int coll_slots = chain.MethodHandle_vmslots();
           tty->print(" coll_slots %d", coll_slots);
           break;
         }
         case java_lang_invoke_AdapterMethodHandle::OP_SPREAD_ARGS: {
           // Check the required length.
           int spread_slots = 1 + chain.adapter_conversion_stack_pushes();
           tty->print(" spread_slots %d", spread_slots);
           break;
         }
         default:
           tty->print_cr("bad adapter conversion");
           break;
       }
     } else {
       // DMH
       tty->print("direct: ");
       chain.last_method_oop()->print_short_name(tty);
     }
     tty->print(" (");
     objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(chain.method_type_oop());
     for (int i = ptypes->length() - 1; i >= 0; i--) {
       BasicType t = java_lang_Class::as_BasicType(ptypes->obj_at(i));
       if (t == T_ARRAY) t = T_OBJECT;
       tty->print("%c", type2char(t));
       if (t == T_LONG || t == T_DOUBLE) tty->print("_");
     }
     tty->print(")");
     BasicType rtype = java_lang_Class::as_BasicType(java_lang_invoke_MethodType::rtype(chain.method_type_oop()));
     if (rtype == T_ARRAY) rtype = T_OBJECT;
     tty->print("%c", type2char(rtype));
     tty->cr();
     if (!chain.is_last()) {
       chain.next(CHECK);
     } else {
       break;
     }
   }
 }
 #endif
 // -----------------------------------------------------------------------------
 // MethodHandleWalker
 Bytecodes::Code MethodHandleWalker::conversion_code(BasicType src, BasicType dest) {
   if (is_subword_type(src)) {
     src = T_INT;          // all subword src types act like int
   }
   if (src == dest) {
     return Bytecodes::_nop;
   }
 #define SRC_DEST(s,d) (((int)(s) << 4) + (int)(d))
   switch (SRC_DEST(src, dest)) {
   case SRC_DEST(T_INT, T_LONG):           return Bytecodes::_i2l;
   case SRC_DEST(T_INT, T_FLOAT):          return Bytecodes::_i2f;
   case SRC_DEST(T_INT, T_DOUBLE):         return Bytecodes::_i2d;
   case SRC_DEST(T_INT, T_BYTE):           return Bytecodes::_i2b;
   case SRC_DEST(T_INT, T_CHAR):           return Bytecodes::_i2c;
   case SRC_DEST(T_INT, T_SHORT):          return Bytecodes::_i2s;
   case SRC_DEST(T_LONG, T_INT):           return Bytecodes::_l2i;
   case SRC_DEST(T_LONG, T_FLOAT):         return Bytecodes::_l2f;
   case SRC_DEST(T_LONG, T_DOUBLE):        return Bytecodes::_l2d;
   case SRC_DEST(T_FLOAT, T_INT):          return Bytecodes::_f2i;
   case SRC_DEST(T_FLOAT, T_LONG):         return Bytecodes::_f2l;
   case SRC_DEST(T_FLOAT, T_DOUBLE):       return Bytecodes::_f2d;
   case SRC_DEST(T_DOUBLE, T_INT):         return Bytecodes::_d2i;
   case SRC_DEST(T_DOUBLE, T_LONG):        return Bytecodes::_d2l;
   case SRC_DEST(T_DOUBLE, T_FLOAT):       return Bytecodes::_d2f;
   }
 #undef SRC_DEST
   // cannot do it in one step, or at all
   return Bytecodes::_illegal;
 }
 // -----------------------------------------------------------------------------
 // MethodHandleWalker::walk
 //
 MethodHandleWalker::ArgToken
 MethodHandleWalker::walk(TRAPS) {
   ArgToken empty = ArgToken();  // Empty return value.
   walk_incoming_state(CHECK_(empty));
   for (;;) {
     set_method_handle(chain().method_handle_oop());
     assert(_outgoing_argc == argument_count_slow(), "empty slots under control");
     if (chain().is_adapter()) {
       int conv_op = chain().adapter_conversion_op();
       int arg_slot = chain().adapter_arg_slot();
       // Check that the arg_slot is valid.  In most cases it must be
       // within range of the current arguments but there are some
       // exceptions.  Those are sanity checked in their implemention
       // below.
       if ((arg_slot < 0 || arg_slot >= _outgoing.length()) &&
           conv_op > java_lang_invoke_AdapterMethodHandle::OP_RETYPE_RAW &&
           conv_op != java_lang_invoke_AdapterMethodHandle::OP_COLLECT_ARGS &&
           conv_op != java_lang_invoke_AdapterMethodHandle::OP_FOLD_ARGS) {
         lose(err_msg("bad argument index %d", arg_slot), CHECK_(empty));
       }
       bool retain_original_args = false;  // used by fold/collect logic
       // perform the adapter action
       switch (conv_op) {
       case java_lang_invoke_AdapterMethodHandle::OP_RETYPE_ONLY:
         // No changes to arguments; pass the bits through.
         break;
       case java_lang_invoke_AdapterMethodHandle::OP_RETYPE_RAW: {
         // To keep the verifier happy, emit bitwise ("raw") conversions as needed.
         // See MethodHandles::same_basic_type_for_arguments for allowed conversions.
         Handle incoming_mtype(THREAD, chain().method_type_oop());
         Handle outgoing_mtype;
         {
           oop outgoing_mh_oop = chain().vmtarget_oop();
           if (!java_lang_invoke_MethodHandle::is_instance(outgoing_mh_oop))
             lose("outgoing target not a MethodHandle", CHECK_(empty));
           outgoing_mtype = Handle(THREAD, java_lang_invoke_MethodHandle::type(outgoing_mh_oop));
         }
         int nptypes = java_lang_invoke_MethodType::ptype_count(outgoing_mtype());
         if (nptypes != java_lang_invoke_MethodType::ptype_count(incoming_mtype()))
           lose("incoming and outgoing parameter count do not agree", CHECK_(empty));
         // Argument types.
         for (int i = 0, slot = _outgoing.length() - 1; slot >= 0; slot--) {
           if (arg_type(slot) == T_VOID)  continue;
           klassOop  src_klass = NULL;
           klassOop  dst_klass = NULL;
           BasicType src = java_lang_Class::as_BasicType(java_lang_invoke_MethodType::ptype(incoming_mtype(), i), &src_klass);
           BasicType dst = java_lang_Class::as_BasicType(java_lang_invoke_MethodType::ptype(outgoing_mtype(), i), &dst_klass);
           retype_raw_argument_type(src, dst, slot, CHECK_(empty));
           i++;  // We need to skip void slots at the top of the loop.
         }
         // Return type.
         {
           BasicType src = java_lang_Class::as_BasicType(java_lang_invoke_MethodType::rtype(incoming_mtype()));
           BasicType dst = java_lang_Class::as_BasicType(java_lang_invoke_MethodType::rtype(outgoing_mtype()));
           retype_raw_return_type(src, dst, CHECK_(empty));
         }
         break;
       }
       case java_lang_invoke_AdapterMethodHandle::OP_CHECK_CAST: {
         // checkcast the Nth outgoing argument in place
         klassOop dest_klass = NULL;
         BasicType dest = java_lang_Class::as_BasicType(chain().adapter_arg_oop(), &dest_klass);
         assert(dest == T_OBJECT, "");
         ArgToken arg = _outgoing.at(arg_slot);
         assert(dest == arg.basic_type(), "");
         arg = make_conversion(T_OBJECT, dest_klass, Bytecodes::_checkcast, arg, CHECK_(empty));
         // replace the object by the result of the cast, to make the compiler happy:
         change_argument(T_OBJECT, arg_slot, T_OBJECT, arg);
         debug_only(dest_klass = (klassOop)badOop);
         break;
       }
       case java_lang_invoke_AdapterMethodHandle::OP_PRIM_TO_PRIM: {
         // i2l, etc., on the Nth outgoing argument in place
         BasicType src = chain().adapter_conversion_src_type(),
                   dest = chain().adapter_conversion_dest_type();
         ArgToken arg = _outgoing.at(arg_slot);
         Bytecodes::Code bc = conversion_code(src, dest);
         if (bc == Bytecodes::_nop) {
           break;
         } else if (bc != Bytecodes::_illegal) {
           arg = make_conversion(dest, NULL, bc, arg, CHECK_(empty));
         } else if (is_subword_type(dest)) {
           bc = conversion_code(src, T_INT);
           if (bc != Bytecodes::_illegal) {
             arg = make_conversion(dest, NULL, bc, arg, CHECK_(empty));
             bc = conversion_code(T_INT, dest);
             arg = make_conversion(dest, NULL, bc, arg, CHECK_(empty));
           }
         }
         if (bc == Bytecodes::_illegal) {
           lose(err_msg("bad primitive conversion for %s -> %s", type2name(src), type2name(dest)), CHECK_(empty));
         }
         change_argument(src, arg_slot, dest, arg);
         break;
       }
       case java_lang_invoke_AdapterMethodHandle::OP_REF_TO_PRIM: {
         // checkcast to wrapper type & call intValue, etc.
         BasicType dest = chain().adapter_conversion_dest_type();
         ArgToken arg = _outgoing.at(arg_slot);
         arg = make_conversion(T_OBJECT, SystemDictionary::box_klass(dest),
                               Bytecodes::_checkcast, arg, CHECK_(empty));
         vmIntrinsics::ID unboxer = vmIntrinsics::for_unboxing(dest);
         if (unboxer == vmIntrinsics::_none) {
           lose("no unboxing method", CHECK_(empty));
         }
         ArgToken arglist[2];
         arglist[0] = arg;         // outgoing 'this'
         arglist[1] = ArgToken();  // sentinel
         arg = make_invoke(methodHandle(), unboxer, Bytecodes::_invokevirtual, false, 1, &arglist[0], CHECK_(empty));
         change_argument(T_OBJECT, arg_slot, dest, arg);
         break;
       }
       case java_lang_invoke_AdapterMethodHandle::OP_PRIM_TO_REF: {
         // call wrapper type.valueOf
         BasicType src = chain().adapter_conversion_src_type();
         vmIntrinsics::ID boxer = vmIntrinsics::for_boxing(src);
         if (boxer == vmIntrinsics::_none) {
           lose("no boxing method", CHECK_(empty));
         }
         ArgToken arg = _outgoing.at(arg_slot);
         ArgToken arglist[2];
         arglist[0] = arg;         // outgoing value
         arglist[1] = ArgToken();  // sentinel
         arg = make_invoke(methodHandle(), boxer, Bytecodes::_invokestatic, false, 1, &arglist[0], CHECK_(empty));
         change_argument(src, arg_slot, T_OBJECT, arg);
         break;
       }
       case java_lang_invoke_AdapterMethodHandle::OP_SWAP_ARGS: {
         int dest_arg_slot = chain().adapter_conversion_vminfo();
         if (!has_argument(dest_arg_slot)) {
           lose("bad swap index", CHECK_(empty));
         }
         // a simple swap between two arguments
         if (arg_slot > dest_arg_slot) {
           int tmp = arg_slot;
           arg_slot = dest_arg_slot;
           dest_arg_slot = tmp;
         }
         ArgToken a1 = _outgoing.at(arg_slot);
         ArgToken a2 = _outgoing.at(dest_arg_slot);
         change_argument(a2.basic_type(), dest_arg_slot, a1);
         change_argument(a1.basic_type(), arg_slot, a2);
         break;
       }
       case java_lang_invoke_AdapterMethodHandle::OP_ROT_ARGS: {
         int limit_raw  = chain().adapter_conversion_vminfo();
         bool rot_down  = (arg_slot < limit_raw);
         int limit_bias = (rot_down ? MethodHandles::OP_ROT_ARGS_DOWN_LIMIT_BIAS : 0);
         int limit_slot = limit_raw - limit_bias;
         if ((uint)limit_slot > (uint)_outgoing.length()) {
           lose("bad rotate index", CHECK_(empty));
         }
         // Rotate the source argument (plus following N slots) into the
         // position occupied by the dest argument (plus following N slots).
         int rotate_count = type2size[chain().adapter_conversion_src_type()];
         // (no other rotate counts are currently supported)
         if (rot_down) {
           for (int i = 0; i < rotate_count; i++) {
             ArgToken temp = _outgoing.at(arg_slot);
             _outgoing.remove_at(arg_slot);
             _outgoing.insert_before(limit_slot - 1, temp);
           }
         } else { // arg_slot > limit_slot => rotate_up
           for (int i = 0; i < rotate_count; i++) {
             ArgToken temp = _outgoing.at(arg_slot + rotate_count - 1);
             _outgoing.remove_at(arg_slot + rotate_count - 1);
             _outgoing.insert_before(limit_slot, temp);
           }
         }
         assert(_outgoing_argc == argument_count_slow(), "empty slots under control");
         break;
       }
       case java_lang_invoke_AdapterMethodHandle::OP_DUP_ARGS: {
         int dup_slots = chain().adapter_conversion_stack_pushes();
         if (dup_slots <= 0) {
           lose("bad dup count", CHECK_(empty));
         }
         for (int i = 0; i < dup_slots; i++) {
           ArgToken dup = _outgoing.at(arg_slot + 2*i);
           if (dup.basic_type() != T_VOID)     _outgoing_argc += 1;
           _outgoing.insert_before(i, dup);
         }
         assert(_outgoing_argc == argument_count_slow(), "empty slots under control");
         break;
       }
       case java_lang_invoke_AdapterMethodHandle::OP_DROP_ARGS: {
         int drop_slots = -chain().adapter_conversion_stack_pushes();
         if (drop_slots <= 0) {
           lose("bad drop count", CHECK_(empty));
         }
         for (int i = 0; i < drop_slots; i++) {
           ArgToken drop = _outgoing.at(arg_slot);
           if (drop.basic_type() != T_VOID)    _outgoing_argc -= 1;
           _outgoing.remove_at(arg_slot);
         }
         assert(_outgoing_argc == argument_count_slow(), "empty slots under control");
         break;
       }
       case java_lang_invoke_AdapterMethodHandle::OP_FOLD_ARGS:
         retain_original_args = true;   // and fall through:
       case java_lang_invoke_AdapterMethodHandle::OP_COLLECT_ARGS: {
         // call argument MH recursively
         //{static int x; if (!x++) print_method_handle(chain().method_handle_oop()); --x;}
         Handle recursive_mh(THREAD, chain().adapter_arg_oop());
         if (!java_lang_invoke_MethodHandle::is_instance(recursive_mh())) {
           lose("recursive target not a MethodHandle", CHECK_(empty));
         }
         Handle recursive_mtype(THREAD, java_lang_invoke_MethodHandle::type(recursive_mh()));
         int argc = java_lang_invoke_MethodType::ptype_count(recursive_mtype());
         int coll_slots = java_lang_invoke_MethodHandle::vmslots(recursive_mh());
         BasicType rtype = java_lang_Class::as_BasicType(java_lang_invoke_MethodType::rtype(recursive_mtype()));
         ArgToken* arglist = NEW_RESOURCE_ARRAY(ArgToken, 1 + argc + 1);  // 1+: mh, +1: sentinel
         arglist[0] = make_oop_constant(recursive_mh(), CHECK_(empty));
         if (arg_slot < 0 || coll_slots < 0 || arg_slot + coll_slots > _outgoing.length()) {
           lose("bad fold/collect arg slot", CHECK_(empty));
         }
         for (int i = 0, slot = arg_slot + coll_slots - 1; slot >= arg_slot; slot--) {
           ArgToken arg_state = _outgoing.at(slot);
           BasicType  arg_type  = arg_state.basic_type();
           if (arg_type == T_VOID)  continue;
           ArgToken arg = _outgoing.at(slot);
           if (i >= argc) { lose("bad fold/collect arg", CHECK_(empty)); }
           arglist[1+i] = arg;
           if (!retain_original_args)
             change_argument(arg_type, slot, T_VOID, ArgToken(tt_void));
           i++;
         }
         arglist[1+argc] = ArgToken();  // sentinel
         oop invoker = java_lang_invoke_MethodTypeForm::vmlayout(
                           java_lang_invoke_MethodType::form(recursive_mtype()) );
         if (invoker == NULL || !invoker->is_method()) {
           lose("bad vmlayout slot", CHECK_(empty));
         }
         // FIXME: consider inlining the invokee at the bytecode level
         ArgToken ret = make_invoke(methodHandle(THREAD, methodOop(invoker)), vmIntrinsics::_invokeGeneric,
                                    Bytecodes::_invokevirtual, false, 1+argc, &arglist[0], CHECK_(empty));
         // The iid = _invokeGeneric really means to adjust reference types as needed.
         DEBUG_ONLY(invoker = NULL);
         if (rtype == T_OBJECT) {
           klassOop rklass = java_lang_Class::as_klassOop( java_lang_invoke_MethodType::rtype(recursive_mtype()) );
           if (rklass != SystemDictionary::Object_klass() &&
               !Klass::cast(rklass)->is_interface()) {
             // preserve type safety
             ret = make_conversion(T_OBJECT, rklass, Bytecodes::_checkcast, ret, CHECK_(empty));
           }
         }
         if (rtype != T_VOID) {
           int ret_slot = arg_slot + (retain_original_args ? coll_slots : 0);
           change_argument(T_VOID, ret_slot, rtype, ret);
         }
         break;
       }
       case java_lang_invoke_AdapterMethodHandle::OP_SPREAD_ARGS: {
         klassOop array_klass_oop = NULL;
         BasicType array_type = java_lang_Class::as_BasicType(chain().adapter_arg_oop(),
                                                              &array_klass_oop);
         assert(array_type == T_OBJECT, "");
         assert(Klass::cast(array_klass_oop)->oop_is_array(), "");
         arrayKlassHandle array_klass(THREAD, array_klass_oop);
         debug_only(array_klass_oop = (klassOop)badOop);
         klassOop element_klass_oop = NULL;
         BasicType element_type = java_lang_Class::as_BasicType(array_klass->component_mirror(),
                                                                &element_klass_oop);
         KlassHandle element_klass(THREAD, element_klass_oop);
         debug_only(element_klass_oop = (klassOop)badOop);
         // Fetch the argument, which we will cast to the required array type.
         ArgToken arg = _outgoing.at(arg_slot);
         assert(arg.basic_type() == T_OBJECT, "");
         ArgToken array_arg = arg;
         array_arg = make_conversion(T_OBJECT, array_klass(), Bytecodes::_checkcast, array_arg, CHECK_(empty));
         change_argument(T_OBJECT, arg_slot, T_VOID, ArgToken(tt_void));
         // Check the required length.
         int spread_slots = 1 + chain().adapter_conversion_stack_pushes();
         int spread_length = spread_slots;
         if (type2size[element_type] == 2) {
           if (spread_slots % 2 != 0)  spread_slots = -1;  // force error
           spread_length = spread_slots / 2;
         }
         if (spread_slots < 0) {
           lose("bad spread length", CHECK_(empty));
         }
         jvalue   length_jvalue;  length_jvalue.i = spread_length;
         ArgToken length_arg = make_prim_constant(T_INT, &length_jvalue, CHECK_(empty));
         // Call a built-in method known to the JVM to validate the length.
         ArgToken arglist[3];
         arglist[0] = array_arg;   // value to check
         arglist[1] = length_arg;  // length to check
         arglist[2] = ArgToken();  // sentinel
         make_invoke(methodHandle(), vmIntrinsics::_checkSpreadArgument,
                     Bytecodes::_invokestatic, false, 2, &arglist[0], CHECK_(empty));
         // Spread out the array elements.
         Bytecodes::Code aload_op = Bytecodes::_nop;
         switch (element_type) {
         case T_INT:       aload_op = Bytecodes::_iaload; break;
         case T_LONG:      aload_op = Bytecodes::_laload; break;
         case T_FLOAT:     aload_op = Bytecodes::_faload; break;
         case T_DOUBLE:    aload_op = Bytecodes::_daload; break;
         case T_OBJECT:    aload_op = Bytecodes::_aaload; break;
         case T_BOOLEAN:   // fall through:
         case T_BYTE:      aload_op = Bytecodes::_baload; break;
         case T_CHAR:      aload_op = Bytecodes::_caload; break;
         case T_SHORT:     aload_op = Bytecodes::_saload; break;
         default:          lose("primitive array NYI", CHECK_(empty));
         }
         int ap = arg_slot;
         for (int i = 0; i < spread_length; i++) {
           jvalue   offset_jvalue;  offset_jvalue.i = i;
           ArgToken offset_arg = make_prim_constant(T_INT, &offset_jvalue, CHECK_(empty));
           ArgToken element_arg = make_fetch(element_type, element_klass(), aload_op, array_arg, offset_arg, CHECK_(empty));
           change_argument(T_VOID, ap, element_type, element_arg);
           //ap += type2size[element_type];  // don't do this; insert next arg to *right* of previous
         }
         break;
       }
       default:
         lose("bad adapter conversion", CHECK_(empty));
         break;
       }
     }
     if (chain().is_bound()) {
       // push a new argument
       BasicType arg_type  = chain().bound_arg_type();
       jint      arg_slot  = chain().bound_arg_slot();
       oop       arg_oop   = chain().bound_arg_oop();
       ArgToken  arg;
       if (arg_type == T_OBJECT) {
         arg = make_oop_constant(arg_oop, CHECK_(empty));
       } else {
         jvalue arg_value;
         BasicType bt = java_lang_boxing_object::get_value(arg_oop, &arg_value);
         if (bt == arg_type || (bt == T_INT && is_subword_type(arg_type))) {
           arg = make_prim_constant(arg_type, &arg_value, CHECK_(empty));
         } else {
           lose(err_msg("bad bound value: arg_type %s boxing %s", type2name(arg_type), type2name(bt)), CHECK_(empty));
         }
       }
       DEBUG_ONLY(arg_oop = badOop);
       change_argument(T_VOID, arg_slot, arg_type, arg);
     }
     // this test must come after the body of the loop
     if (!chain().is_last()) {
       chain().next(CHECK_(empty));
     } else {
       break;
     }
   }
   // finish the sequence with a tail-call to the ultimate target
   // parameters are passed in logical order (recv 1st), not slot order
   ArgToken* arglist = NEW_RESOURCE_ARRAY(ArgToken, _outgoing.length() + 1);
   int ap = 0;
   for (int i = _outgoing.length() - 1; i >= 0; i--) {
     ArgToken arg_state = _outgoing.at(i);
     if (arg_state.basic_type() == T_VOID)  continue;
     arglist[ap++] = _outgoing.at(i);
   }
   assert(ap == _outgoing_argc, "");
   arglist[ap] = ArgToken();  // add a sentinel, for the sake of asserts
   return make_invoke(chain().last_method(),
                      vmIntrinsics::_none,
                      chain().last_invoke_code(), true,
                      ap, arglist, THREAD);
 }
 // -----------------------------------------------------------------------------
 // MethodHandleWalker::walk_incoming_state
 //
 void MethodHandleWalker::walk_incoming_state(TRAPS) {
   Handle mtype(THREAD, chain().method_type_oop());
   int nptypes = java_lang_invoke_MethodType::ptype_count(mtype());
   _outgoing_argc = nptypes;
   int argp = nptypes - 1;
   if (argp >= 0) {
     _outgoing.at_grow(argp, ArgToken(tt_void)); // presize
   }
   for (int i = 0; i < nptypes; i++) {
     klassOop  arg_type_klass = NULL;
     BasicType arg_type = java_lang_Class::as_BasicType(java_lang_invoke_MethodType::ptype(mtype(), i), &arg_type_klass);
     int index = new_local_index(arg_type);
     ArgToken arg = make_parameter(arg_type, arg_type_klass, index, CHECK);
     DEBUG_ONLY(arg_type_klass = (klassOop) NULL);
     _outgoing.at_put(argp, arg);
     if (type2size[arg_type] == 2) {
       // add the extra slot, so we can model the JVM stack
       _outgoing.insert_before(argp+1, ArgToken(tt_void));
     }
     --argp;
   }
   // call make_parameter at the end of the list for the return type
   klassOop  ret_type_klass = NULL;
   BasicType ret_type = java_lang_Class::as_BasicType(java_lang_invoke_MethodType::rtype(mtype()), &ret_type_klass);
   ArgToken  ret = make_parameter(ret_type, ret_type_klass, -1, CHECK);
   // ignore ret; client can catch it if needed
   assert(_outgoing_argc == argument_count_slow(), "empty slots under control");
   verify_args_and_signature(CHECK);
 }
 #ifdef ASSERT
 void MethodHandleWalker::verify_args_and_signature(TRAPS) {
   int index = _outgoing.length() - 1;
   objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(chain().method_type_oop());
   for (int i = 0, limit = ptypes->length(); i < limit; i++) {
     BasicType t = java_lang_Class::as_BasicType(ptypes->obj_at(i));
     if (t == T_ARRAY) t = T_OBJECT;
     if (t == T_LONG || t == T_DOUBLE) {
       assert(T_VOID == _outgoing.at(index).basic_type(), "types must match");
       index--;
     }
     assert(t == _outgoing.at(index).basic_type(), "types must match");
     index--;
   }
 }
 #endif
 // -----------------------------------------------------------------------------
 // MethodHandleWalker::change_argument
 //
 // This is messy because some kinds of arguments are paired with
 // companion slots containing an empty value.
 void MethodHandleWalker::change_argument(BasicType old_type, int slot, const ArgToken& new_arg) {
   BasicType new_type = new_arg.basic_type();
   int old_size = type2size[old_type];
   int new_size = type2size[new_type];
   if (old_size == new_size) {
     // simple case first
     _outgoing.at_put(slot, new_arg);
   } else if (old_size > new_size) {
     for (int i = old_size - 1; i >= new_size; i--) {
       assert((i != 0) == (_outgoing.at(slot + i).basic_type() == T_VOID), "");
       _outgoing.remove_at(slot + i);
     }
     if (new_size > 0)
       _outgoing.at_put(slot, new_arg);
     else
       _outgoing_argc -= 1;      // deleted a real argument
   } else {
     for (int i = old_size; i < new_size; i++) {
       _outgoing.insert_before(slot + i, ArgToken(tt_void));
     }
     _outgoing.at_put(slot, new_arg);
     if (old_size == 0)
       _outgoing_argc += 1;      // inserted a real argument
   }
   assert(_outgoing_argc == argument_count_slow(), "empty slots under control");
 }
 #ifdef ASSERT
 int MethodHandleWalker::argument_count_slow() {
   int args_seen = 0;
   for (int i = _outgoing.length() - 1; i >= 0; i--) {
     if (_outgoing.at(i).basic_type() != T_VOID) {
       ++args_seen;
       if (_outgoing.at(i).basic_type() == T_LONG ||
           _outgoing.at(i).basic_type() == T_DOUBLE) {
         assert(_outgoing.at(i + 1).basic_type() == T_VOID, "should only follow two word");
       }
     } else {
       assert(_outgoing.at(i - 1).basic_type() == T_LONG ||
              _outgoing.at(i - 1).basic_type() == T_DOUBLE, "should only follow two word");
     }
   }
   return args_seen;
 }
 #endif
 // -----------------------------------------------------------------------------
 // MethodHandleWalker::retype_raw_conversion
 //
 // Do the raw retype conversions for OP_RETYPE_RAW.
 void MethodHandleWalker::retype_raw_conversion(BasicType src, BasicType dst, bool for_return, int slot, TRAPS) {
   if (src != dst) {
     if (MethodHandles::same_basic_type_for_returns(src, dst, /*raw*/ true)) {
       if (MethodHandles::is_float_fixed_reinterpretation_cast(src, dst)) {
         vmIntrinsics::ID iid = vmIntrinsics::for_raw_conversion(src, dst);
         if (iid == vmIntrinsics::_none) {
           lose("no raw conversion method", CHECK);
         }
         ArgToken arglist[2];
         if (!for_return) {
           // argument type conversion
           ArgToken arg = _outgoing.at(slot);
           assert(arg.token_type() >= tt_symbolic || src == arg.basic_type(), "sanity");
           arglist[0] = arg;         // outgoing 'this'
           arglist[1] = ArgToken();  // sentinel
           arg = make_invoke(methodHandle(), iid, Bytecodes::_invokestatic, false, 1, &arglist[0], CHECK);
           change_argument(src, slot, dst, arg);
         } else {
           // return type conversion
           if (_return_conv == vmIntrinsics::_none) {
             _return_conv = iid;
           } else if (_return_conv == vmIntrinsics::for_raw_conversion(dst, src)) {
             _return_conv = vmIntrinsics::_none;
           } else if (_return_conv != zero_return_conv()) {
             lose(err_msg("requested raw return conversion not allowed: %s -> %s (before %s)", type2name(src), type2name(dst), vmIntrinsics::name_at(_return_conv)), CHECK);
           }
         }
       } else {
         // Nothing to do.
       }
     } else if (for_return && (!is_subword_type(src) || !is_subword_type(dst))) {
       // This can occur in exception-throwing MHs, which have a fictitious return value encoded as Void or Empty.
       _return_conv = zero_return_conv();
     } else if (src == T_OBJECT && is_java_primitive(dst)) {
       // ref-to-prim: discard ref, push zero
       lose("requested ref-to-prim conversion not expected", CHECK);
     } else {
       lose(err_msg("requested raw conversion not allowed: %s -> %s", type2name(src), type2name(dst)), CHECK);
     }
   }
 }
 // -----------------------------------------------------------------------------
 // MethodHandleCompiler
 MethodHandleCompiler::MethodHandleCompiler(Handle root, Symbol* name, Symbol* signature, int invoke_count, bool is_invokedynamic, TRAPS)
   : MethodHandleWalker(root, is_invokedynamic, THREAD),
     _invoke_count(invoke_count),
     _thread(THREAD),
     _bytecode(THREAD, 50),
     _constants(THREAD, 10),
     _non_bcp_klasses(THREAD, 5),
     _cur_stack(0),
     _max_stack(0),
     _rtype(T_ILLEGAL),
     _selectAlternative_bci(-1),
     _taken_count(0),
     _not_taken_count(0)
 {
   // Element zero is always the null constant.
   (void) _constants.append(NULL);
   // Set name and signature index.
   _name_index      = cpool_symbol_put(name);
   _signature_index = cpool_symbol_put(signature);
   // To make the resulting methods more recognizable by
   // stack walkers and compiler heuristics,
   // we put them in holder class MethodHandle.
   // See klass_is_method_handle_adapter_holder
   // and methodOopDesc::is_method_handle_adapter.
   _target_klass = SystemDictionaryHandles::MethodHandle_klass();
   check_non_bcp_klasses(java_lang_invoke_MethodHandle::type(root()), CHECK);
   // Get return type klass.
   Handle first_mtype(THREAD, chain().method_type_oop());
   // _rklass is NULL for primitives.
   _rtype = java_lang_Class::as_BasicType(java_lang_invoke_MethodType::rtype(first_mtype()), &_rklass);
   if (_rtype == T_ARRAY)  _rtype = T_OBJECT;
   ArgumentSizeComputer args(signature);
   int params = args.size() + 1;  // Incoming arguments plus receiver.
   _num_params = for_invokedynamic() ? params - 1 : params;  // XXX Check if callee is static?
 }
 // -----------------------------------------------------------------------------
 // MethodHandleCompiler::compile
 //
 // Compile this MethodHandle into a bytecode adapter and return a
 // methodOop.
 methodHandle MethodHandleCompiler::compile(TRAPS) {
   assert(_thread == THREAD, "must be same thread");
   methodHandle nullHandle;
   (void) walk(CHECK_(nullHandle));
   record_non_bcp_klasses();
   return get_method_oop(CHECK_(nullHandle));
 }
 void MethodHandleCompiler::emit_bc(Bytecodes::Code op, int index, int args_size) {
   Bytecodes::check(op);  // Are we legal?
   switch (op) {
   // b
   case Bytecodes::_aconst_null:
   case Bytecodes::_iconst_m1:
   case Bytecodes::_iconst_0:
   case Bytecodes::_iconst_1:
   case Bytecodes::_iconst_2:
   case Bytecodes::_iconst_3:
   case Bytecodes::_iconst_4:
   case Bytecodes::_iconst_5:
   case Bytecodes::_lconst_0:
   case Bytecodes::_lconst_1:
   case Bytecodes::_fconst_0:
   case Bytecodes::_fconst_1:
   case Bytecodes::_fconst_2:
   case Bytecodes::_dconst_0:
   case Bytecodes::_dconst_1:
   case Bytecodes::_iload_0:
   case Bytecodes::_iload_1:
   case Bytecodes::_iload_2:
   case Bytecodes::_iload_3:
   case Bytecodes::_lload_0:
   case Bytecodes::_lload_1:
   case Bytecodes::_lload_2:
   case Bytecodes::_lload_3:
   case Bytecodes::_fload_0:
   case Bytecodes::_fload_1:
   case Bytecodes::_fload_2:
   case Bytecodes::_fload_3:
   case Bytecodes::_dload_0:
   case Bytecodes::_dload_1:
   case Bytecodes::_dload_2:
   case Bytecodes::_dload_3:
   case Bytecodes::_aload_0:
   case Bytecodes::_aload_1:
   case Bytecodes::_aload_2:
   case Bytecodes::_aload_3:
   case Bytecodes::_istore_0:
   case Bytecodes::_istore_1:
   case Bytecodes::_istore_2:
   case Bytecodes::_istore_3:
   case Bytecodes::_lstore_0:
   case Bytecodes::_lstore_1:
   case Bytecodes::_lstore_2:
   case Bytecodes::_lstore_3:
   case Bytecodes::_fstore_0:
   case Bytecodes::_fstore_1:
   case Bytecodes::_fstore_2:
   case Bytecodes::_fstore_3:
   case Bytecodes::_dstore_0:
   case Bytecodes::_dstore_1:
   case Bytecodes::_dstore_2:
   case Bytecodes::_dstore_3:
   case Bytecodes::_astore_0:
   case Bytecodes::_astore_1:
   case Bytecodes::_astore_2:
   case Bytecodes::_astore_3:
   case Bytecodes::_iand:
   case Bytecodes::_i2l:
   case Bytecodes::_i2f:
   case Bytecodes::_i2d:
   case Bytecodes::_i2b:
   case Bytecodes::_i2c:
   case Bytecodes::_i2s:
   case Bytecodes::_l2i:
   case Bytecodes::_l2f:
   case Bytecodes::_l2d:
   case Bytecodes::_f2i:
   case Bytecodes::_f2l:
   case Bytecodes::_f2d:
   case Bytecodes::_d2i:
   case Bytecodes::_d2l:
   case Bytecodes::_d2f:
   case Bytecodes::_iaload:
   case Bytecodes::_laload:
   case Bytecodes::_faload:
   case Bytecodes::_daload:
   case Bytecodes::_aaload:
   case Bytecodes::_baload:
   case Bytecodes::_caload:
   case Bytecodes::_saload:
   case Bytecodes::_ireturn:
   case Bytecodes::_lreturn:
   case Bytecodes::_freturn:
   case Bytecodes::_dreturn:
   case Bytecodes::_areturn:
   case Bytecodes::_return:
     assert(Bytecodes::format_bits(op, false) == Bytecodes::_fmt_b, "wrong bytecode format");
     _bytecode.push(op);
     break;
   // bi
   case Bytecodes::_ldc:
     assert(Bytecodes::format_bits(op, false) == (Bytecodes::_fmt_b|Bytecodes::_fmt_has_k), "wrong bytecode format");
     if (index == (index & 0xff)) {
       _bytecode.push(op);
       _bytecode.push(index);
     } else {
       _bytecode.push(Bytecodes::_ldc_w);
       _bytecode.push(index >> 8);
       _bytecode.push(index);
     }
     break;
   case Bytecodes::_iload:
   case Bytecodes::_lload:
   case Bytecodes::_fload:
   case Bytecodes::_dload:
   case Bytecodes::_aload:
   case Bytecodes::_istore:
   case Bytecodes::_lstore:
   case Bytecodes::_fstore:
   case Bytecodes::_dstore:
   case Bytecodes::_astore:
     assert(Bytecodes::format_bits(op, false) == Bytecodes::_fmt_bi, "wrong bytecode format");
     if (index == (index & 0xff)) {
       _bytecode.push(op);
       _bytecode.push(index);
     } else {
       // doesn't fit in a u2
       _bytecode.push(Bytecodes::_wide);
       _bytecode.push(op);
       _bytecode.push(index >> 8);
       _bytecode.push(index);
     }
     break;
   // bkk
   case Bytecodes::_ldc_w:
   case Bytecodes::_ldc2_w:
   case Bytecodes::_checkcast:
     assert(Bytecodes::format_bits(op, false) == Bytecodes::_fmt_bkk, "wrong bytecode format");
     assert((unsigned short) index == index, "index does not fit in 16-bit");
     _bytecode.push(op);
     _bytecode.push(index >> 8);
     _bytecode.push(index);
     break;
   // bJJ
   case Bytecodes::_invokestatic:
   case Bytecodes::_invokespecial:
   case Bytecodes::_invokevirtual:
     assert(Bytecodes::format_bits(op, false) == Bytecodes::_fmt_bJJ, "wrong bytecode format");
     assert((unsigned short) index == index, "index does not fit in 16-bit");
     _bytecode.push(op);
     _bytecode.push(index >> 8);
     _bytecode.push(index);
     break;
   case Bytecodes::_invokeinterface:
     assert(Bytecodes::format_bits(op, false) == Bytecodes::_fmt_bJJ, "wrong bytecode format");
     assert((unsigned short) index == index, "index does not fit in 16-bit");
     assert(args_size > 0, "valid args_size");
     _bytecode.push(op);
     _bytecode.push(index >> 8);
     _bytecode.push(index);
     _bytecode.push(args_size);
     _bytecode.push(0);
     break;
   case Bytecodes::_ifeq:
     assert((unsigned short) index == index, "index does not fit in 16-bit");
     _bytecode.push(op);
     _bytecode.push(index >> 8);
     _bytecode.push(index);
     break;
   default:
     ShouldNotReachHere();
   }
 }
 void MethodHandleCompiler::update_branch_dest(int src, int dst) {
   switch (_bytecode.at(src)) {
     case Bytecodes::_ifeq:
       dst -= src; // compute the offset
       assert((unsigned short) dst == dst, "index does not fit in 16-bit");
       _bytecode.at_put(src + 1, dst >> 8);
       _bytecode.at_put(src + 2, dst);
       break;
     default:
       ShouldNotReachHere();
   }
 }
 void MethodHandleCompiler::emit_load(ArgToken arg) {
   TokenType tt = arg.token_type();
   BasicType bt = arg.basic_type();
   switch (tt) {
     case tt_parameter:
     case tt_temporary:
       emit_load(bt, arg.index());
       break;
     case tt_constant:
       emit_load_constant(arg);
       break;
     case tt_illegal:
     case tt_void:
     default:
       ShouldNotReachHere();
   }
 }
 void MethodHandleCompiler::emit_load(BasicType bt, int index) {
   if (index <= 3) {
     switch (bt) {
     case T_BOOLEAN: case T_BYTE: case T_CHAR: case T_SHORT:
     case T_INT:    emit_bc(Bytecodes::cast(Bytecodes::_iload_0 + index)); break;
     case T_LONG:   emit_bc(Bytecodes::cast(Bytecodes::_lload_0 + index)); break;
     case T_FLOAT:  emit_bc(Bytecodes::cast(Bytecodes::_fload_0 + index)); break;
     case T_DOUBLE: emit_bc(Bytecodes::cast(Bytecodes::_dload_0 + index)); break;
     case T_OBJECT: emit_bc(Bytecodes::cast(Bytecodes::_aload_0 + index)); break;
     default:
       ShouldNotReachHere();
     }
   }
   else {
     switch (bt) {
     case T_BOOLEAN: case T_BYTE: case T_CHAR: case T_SHORT:
     case T_INT:    emit_bc(Bytecodes::_iload, index); break;
     case T_LONG:   emit_bc(Bytecodes::_lload, index); break;
     case T_FLOAT:  emit_bc(Bytecodes::_fload, index); break;
     case T_DOUBLE: emit_bc(Bytecodes::_dload, index); break;
     case T_OBJECT: emit_bc(Bytecodes::_aload, index); break;
     default:
       ShouldNotReachHere();
     }
   }
   stack_push(bt);
 }
 void MethodHandleCompiler::emit_store(BasicType bt, int index) {
   if (index <= 3) {
     switch (bt) {
     case T_BOOLEAN: case T_BYTE: case T_CHAR: case T_SHORT:
     case T_INT:    emit_bc(Bytecodes::cast(Bytecodes::_istore_0 + index)); break;
     case T_LONG:   emit_bc(Bytecodes::cast(Bytecodes::_lstore_0 + index)); break;
     case T_FLOAT:  emit_bc(Bytecodes::cast(Bytecodes::_fstore_0 + index)); break;
     case T_DOUBLE: emit_bc(Bytecodes::cast(Bytecodes::_dstore_0 + index)); break;
     case T_OBJECT: emit_bc(Bytecodes::cast(Bytecodes::_astore_0 + index)); break;
     default:
       ShouldNotReachHere();
     }
   }
   else {
     switch (bt) {
     case T_BOOLEAN: case T_BYTE: case T_CHAR: case T_SHORT:
     case T_INT:    emit_bc(Bytecodes::_istore, index); break;
     case T_LONG:   emit_bc(Bytecodes::_lstore, index); break;
     case T_FLOAT:  emit_bc(Bytecodes::_fstore, index); break;
     case T_DOUBLE: emit_bc(Bytecodes::_dstore, index); break;
     case T_OBJECT: emit_bc(Bytecodes::_astore, index); break;
     default:
       ShouldNotReachHere();
     }
   }
   stack_pop(bt);
 }
 void MethodHandleCompiler::emit_load_constant(ArgToken arg) {
   BasicType bt = arg.basic_type();
   if (is_subword_type(bt)) bt = T_INT;
   switch (bt) {
   case T_INT: {
     jint value = arg.get_jint();
     if (-1 <= value && value <= 5)
       emit_bc(Bytecodes::cast(Bytecodes::_iconst_0 + value));
     else
       emit_bc(Bytecodes::_ldc, cpool_int_put(value));
     break;
   }
   case T_LONG: {
     jlong value = arg.get_jlong();
     if (0 <= value && value <= 1)
       emit_bc(Bytecodes::cast(Bytecodes::_lconst_0 + (int) value));
     else
       emit_bc(Bytecodes::_ldc2_w, cpool_long_put(value));
     break;
   }
   case T_FLOAT: {
     jfloat value  = arg.get_jfloat();
     if (value == 0.0 || value == 1.0 || value == 2.0)
       emit_bc(Bytecodes::cast(Bytecodes::_fconst_0 + (int) value));
     else
       emit_bc(Bytecodes::_ldc, cpool_float_put(value));
     break;
   }
   case T_DOUBLE: {
     jdouble value = arg.get_jdouble();
     if (value == 0.0 || value == 1.0)
       emit_bc(Bytecodes::cast(Bytecodes::_dconst_0 + (int) value));
     else
       emit_bc(Bytecodes::_ldc2_w, cpool_double_put(value));
     break;
   }
   case T_OBJECT: {
     Handle value = arg.object();
     if (value.is_null()) {
       emit_bc(Bytecodes::_aconst_null);
       break;
     }
     if (java_lang_Class::is_instance(value())) {
       klassOop k = java_lang_Class::as_klassOop(value());
       if (k != NULL) {
         emit_bc(Bytecodes::_ldc, cpool_klass_put(k));
         break;
       }
     }
     emit_bc(Bytecodes::_ldc, cpool_object_put(value));
     break;
   }
   default:
     ShouldNotReachHere();
   }
   stack_push(bt);
 }
 MethodHandleWalker::ArgToken
 MethodHandleCompiler::make_conversion(BasicType type, klassOop tk, Bytecodes::Code op,
                                       const ArgToken& src, TRAPS) {
   BasicType srctype = src.basic_type();
   TokenType tt = src.token_type();
   int index = -1;
   switch (op) {
   case Bytecodes::_i2l:
   case Bytecodes::_i2f:
   case Bytecodes::_i2d:
   case Bytecodes::_i2b:
   case Bytecodes::_i2c:
   case Bytecodes::_i2s:
   case Bytecodes::_l2i:
   case Bytecodes::_l2f:
   case Bytecodes::_l2d:
   case Bytecodes::_f2i:
   case Bytecodes::_f2l:
   case Bytecodes::_f2d:
   case Bytecodes::_d2i:
   case Bytecodes::_d2l:
   case Bytecodes::_d2f:
     if (tt == tt_constant) {
       emit_load_constant(src);
     } else {
       emit_load(srctype, src.index());
     }
     stack_pop(srctype);  // pop the src type
     emit_bc(op);
     stack_push(type);    // push the dest value
     if (tt != tt_constant)
       index = src.index();
     if (srctype != type || index == -1)
       index = new_local_index(type);
     emit_store(type, index);
     break;
   case Bytecodes::_checkcast:
     if (tt == tt_constant) {
       emit_load_constant(src);
     } else {
       emit_load(srctype, src.index());
       index = src.index();
     }
     emit_bc(op, cpool_klass_put(tk));
     check_non_bcp_klass(tk, CHECK_(src));
     // Allocate a new local for the type so that we don't hide the
     // previous type from the verifier.
     index = new_local_index(type);
     emit_store(srctype, index);
     break;
   case Bytecodes::_nop:
     // nothing to do
     return src;
   default:
     if (op == Bytecodes::_illegal)
       lose(err_msg("no such primitive conversion: %s -> %s", type2name(src.basic_type()), type2name(type)), THREAD);
     else
       lose(err_msg("bad primitive conversion op: %s", Bytecodes::name(op)), THREAD);
     return make_prim_constant(type, &zero_jvalue, THREAD);
   }
   return make_parameter(type, tk, index, THREAD);
 }
 // -----------------------------------------------------------------------------
 // MethodHandleCompiler
 //
 // Values used by the compiler.
 jvalue MethodHandleCompiler::zero_jvalue = { 0 };
 jvalue MethodHandleCompiler::one_jvalue  = { 1 };
 // Fetch any values from CountingMethodHandles and capture them for profiles
 bool MethodHandleCompiler::fetch_counts(ArgToken arg1, ArgToken arg2) {
   int count1 = -1, count2 = -1;
   if (arg1.token_type() == tt_constant && arg1.basic_type() == T_OBJECT &&
       java_lang_invoke_CountingMethodHandle::is_instance(arg1.object()())) {
     count1 = java_lang_invoke_CountingMethodHandle::vmcount(arg1.object()());
   }
   if (arg2.token_type() == tt_constant && arg2.basic_type() == T_OBJECT &&
       java_lang_invoke_CountingMethodHandle::is_instance(arg2.object()())) {
     count2 = java_lang_invoke_CountingMethodHandle::vmcount(arg2.object()());
   }
   int total = count1 + count2;
   if (count1 != -1 && count2 != -1 && total != 0) {
     // Normalize the collect counts to the invoke_count
     if (count1 != 0) _not_taken_count = (int)(_invoke_count * count1 / (double)total);
     if (count2 != 0) _taken_count = (int)(_invoke_count * count2 / (double)total);
     return true;
   }
   return false;
 }
 // Emit bytecodes for the given invoke instruction.
 MethodHandleWalker::ArgToken
 MethodHandleCompiler::make_invoke(methodHandle m, vmIntrinsics::ID iid,
                                   Bytecodes::Code op, bool tailcall,
                                   int argc, MethodHandleWalker::ArgToken* argv,
                                   TRAPS) {
   ArgToken zero;
   if (m.is_null()) {
     // Get the intrinsic methodOop.
     m = methodHandle(THREAD, vmIntrinsics::method_for(iid));
     if (m.is_null()) {
       lose(vmIntrinsics::name_at(iid), CHECK_(zero));
     }
   }
   klassOop klass     = m->method_holder();
   Symbol*  name      = m->name();
   Symbol*  signature = m->signature();
   if (iid == vmIntrinsics::_invokeGeneric &&
       argc >= 1 && argv[0].token_type() == tt_constant) {
     assert(m->intrinsic_id() == vmIntrinsics::_invokeExact, "");
     Handle receiver = argv[0].object();
     Handle rtype(THREAD, java_lang_invoke_MethodHandle::type(receiver()));
     Handle mtype(THREAD, m->method_handle_type());
     if (rtype() != mtype()) {
       assert(java_lang_invoke_MethodType::form(rtype()) ==
              java_lang_invoke_MethodType::form(mtype()),
              "must be the same shape");
       // customize m to the exact required rtype
       bool has_non_bcp_klass = check_non_bcp_klasses(rtype(), CHECK_(zero));
       TempNewSymbol sig2 = java_lang_invoke_MethodType::as_signature(rtype(), true, CHECK_(zero));
       methodHandle m2;
       if (!has_non_bcp_klass) {
         methodOop m2_oop = SystemDictionary::find_method_handle_invoke(m->name(), sig2,
                                                                        KlassHandle(), CHECK_(zero));
         m2 = methodHandle(THREAD, m2_oop);
       }
       if (m2.is_null()) {
         // just build it fresh
         m2 = methodOopDesc::make_invoke_method(klass, m->name(), sig2, rtype, CHECK_(zero));
         if (m2.is_null())
           lose(err_msg("no customized invoker %s", sig2->as_utf8()), CHECK_(zero));
       }
       m = m2;
       signature = m->signature();
     }
   }
   if (m->intrinsic_id() == vmIntrinsics::_selectAlternative &&
       fetch_counts(argv[1], argv[2])) {
     assert(argc == 3, "three arguments");
     assert(tailcall, "only");
     // do inline bytecodes so we can drop profile data into it,
     //   0:   iload_0
     emit_load(argv[0]);
     //   1:   ifeq    8
     _selectAlternative_bci = _bytecode.length();
     emit_bc(Bytecodes::_ifeq, 0); // emit placeholder offset
     //   4:   aload_1
     emit_load(argv[1]);
     //   5:   areturn;
     emit_bc(Bytecodes::_areturn);
     //   8:   aload_2
     update_branch_dest(_selectAlternative_bci, cur_bci());
     emit_load(argv[2]);
     //   9:   areturn
     emit_bc(Bytecodes::_areturn);
     return ArgToken();  // Dummy return value.
   }
   check_non_bcp_klass(klass, CHECK_(zero));
   if (m->is_method_handle_invoke()) {
     check_non_bcp_klasses(m->method_handle_type(), CHECK_(zero));
   }
   // Count the number of arguments, not the size
   ArgumentCount asc(signature);
   assert(argc == asc.size() + ((op == Bytecodes::_invokestatic || op == Bytecodes::_invokedynamic) ? 0 : 1),
          "argc mismatch");
   for (int i = 0; i < argc; i++) {
     ArgToken arg = argv[i];
     TokenType tt = arg.token_type();
     BasicType bt = arg.basic_type();
     switch (tt) {
     case tt_parameter:
     case tt_temporary:
       emit_load(bt, arg.index());
       break;
     case tt_constant:
       emit_load_constant(arg);
       break;
     case tt_illegal:
       // Sentinel.
       assert(i == (argc - 1), "sentinel must be last entry");
       break;
     case tt_void:
     default:
       ShouldNotReachHere();
     }
   }
   // Populate constant pool.
   int name_index          = cpool_symbol_put(name);
   int signature_index     = cpool_symbol_put(signature);
   int name_and_type_index = cpool_name_and_type_put(name_index, signature_index);
   int klass_index         = cpool_klass_put(klass);
   int methodref_index     = cpool_methodref_put(op, klass_index, name_and_type_index, m);
   // Generate invoke.
   switch (op) {
   case Bytecodes::_invokestatic:
   case Bytecodes::_invokespecial:
   case Bytecodes::_invokevirtual:
     emit_bc(op, methodref_index);
     break;
   case Bytecodes::_invokeinterface: {
     ArgumentSizeComputer asc(signature);
     emit_bc(op, methodref_index, asc.size() + 1);
     break;
   }
   default:
     ShouldNotReachHere();
   }
   // If tailcall, we have walked all the way to a direct method handle.
   // Otherwise, make a recursive call to some helper routine.
   BasicType rbt = m->result_type();
   if (rbt == T_ARRAY)  rbt = T_OBJECT;
   stack_push(rbt);  // The return value is already pushed onto the stack.
   ArgToken ret;
   if (tailcall) {
     if (return_conv() == zero_return_conv()) {
       rbt = T_VOID;  // discard value
     } else if (return_conv() != vmIntrinsics::_none) {
       // return value conversion
       int index = new_local_index(rbt);
       emit_store(rbt, index);
       ArgToken arglist[2];
       arglist[0] = ArgToken(tt_temporary, rbt, index);
       arglist[1] = ArgToken();  // sentinel
       ret = make_invoke(methodHandle(), return_conv(), Bytecodes::_invokestatic, false, 1, &arglist[0], CHECK_(zero));
       set_return_conv(vmIntrinsics::_none);
       rbt = ret.basic_type();
       emit_load(rbt, ret.index());
     }
     if (rbt != _rtype) {
       if (rbt == T_VOID) {
         // push a zero of the right sort
         if (_rtype == T_OBJECT) {
           zero = make_oop_constant(NULL, CHECK_(zero));
         } else {
           zero = make_prim_constant(_rtype, &zero_jvalue, CHECK_(zero));
         }
         emit_load_constant(zero);
       } else if (_rtype == T_VOID) {
         // We'll emit a _return with something on the stack.
         // It's OK to ignore what's on the stack.
       } else if (rbt == T_INT && is_subword_type(_rtype)) {
         // Convert value to match return type.
         switch (_rtype) {
         case T_BOOLEAN: {
           // boolean is treated as a one-bit unsigned integer.
           // Cf. API documentation: java/lang/invoke/MethodHandles.html#explicitCastArguments
           ArgToken one = make_prim_constant(T_INT, &one_jvalue, CHECK_(zero));
           emit_load_constant(one);
           emit_bc(Bytecodes::_iand);
           break;
         }
         case T_BYTE:    emit_bc(Bytecodes::_i2b); break;
         case T_CHAR:    emit_bc(Bytecodes::_i2c); break;
         case T_SHORT:   emit_bc(Bytecodes::_i2s); break;
         default: ShouldNotReachHere();
         }
       } else if (is_subword_type(rbt) && (is_subword_type(_rtype) || (_rtype == T_INT))) {
         // The subword type was returned as an int and will be passed
         // on as an int.
       } else {
         lose("unknown conversion", CHECK_(zero));
       }
     }
     switch (_rtype) {
     case T_BOOLEAN: case T_BYTE: case T_CHAR: case T_SHORT:
     case T_INT:    emit_bc(Bytecodes::_ireturn); break;
     case T_LONG:   emit_bc(Bytecodes::_lreturn); break;
     case T_FLOAT:  emit_bc(Bytecodes::_freturn); break;
     case T_DOUBLE: emit_bc(Bytecodes::_dreturn); break;
     case T_VOID:   emit_bc(Bytecodes::_return);  break;
     case T_OBJECT:
       if (_rklass.not_null() && _rklass() != SystemDictionary::Object_klass() && !Klass::cast(_rklass())->is_interface()) {
         emit_bc(Bytecodes::_checkcast, cpool_klass_put(_rklass()));
         check_non_bcp_klass(_rklass(), CHECK_(zero));
       }
       emit_bc(Bytecodes::_areturn);
       break;
     default: ShouldNotReachHere();
     }
     ret = ArgToken();  // Dummy return value.
   }
   else {
     int index = new_local_index(rbt);
     switch (rbt) {
     case T_BOOLEAN: case T_BYTE: case T_CHAR:  case T_SHORT:
     case T_INT:     case T_LONG: case T_FLOAT: case T_DOUBLE:
     case T_OBJECT:
       emit_store(rbt, index);
       ret = ArgToken(tt_temporary, rbt, index);
       break;
     case T_VOID:
       ret = ArgToken(tt_void);
       break;
     default:
       ShouldNotReachHere();
     }
   }
   return ret;
 }
 MethodHandleWalker::ArgToken
 MethodHandleCompiler::make_fetch(BasicType type, klassOop tk, Bytecodes::Code op,
                                  const MethodHandleWalker::ArgToken& base,
                                  const MethodHandleWalker::ArgToken& offset,
                                  TRAPS) {
   switch (base.token_type()) {
     case tt_parameter:
     case tt_temporary:
       emit_load(base.basic_type(), base.index());
       break;
     case tt_constant:
       emit_load_constant(base);
       break;
     default:
       ShouldNotReachHere();
   }
   switch (offset.token_type()) {
     case tt_parameter:
     case tt_temporary:
       emit_load(offset.basic_type(), offset.index());
       break;
     case tt_constant:
       emit_load_constant(offset);
       break;
     default:
       ShouldNotReachHere();
   }
   emit_bc(op);
   int index = new_local_index(type);
   emit_store(type, index);
   return ArgToken(tt_temporary, type, index);
 }
 int MethodHandleCompiler::cpool_primitive_put(BasicType bt, jvalue* con) {
   jvalue con_copy;
   assert(bt < T_OBJECT, "");
   if (type2aelembytes(bt) < jintSize) {
     // widen to int
     con_copy = (*con);
     con = &con_copy;
     switch (bt) {
     case T_BOOLEAN: con->i = (con->z ? 1 : 0); break;
     case T_BYTE:    con->i = con->b;           break;
     case T_CHAR:    con->i = con->c;           break;
     case T_SHORT:   con->i = con->s;           break;
     default: ShouldNotReachHere();
     }
     bt = T_INT;
   }
 //   for (int i = 1, imax = _constants.length(); i < imax; i++) {
 //     ConstantValue* con = _constants.at(i);
 //     if (con != NULL && con->is_primitive() && con.basic_type() == bt) {
 //       bool match = false;
 //       switch (type2size[bt]) {
 //       case 1:  if (pcon->_value.i == con->i)  match = true;  break;
 //       case 2:  if (pcon->_value.j == con->j)  match = true;  break;
 //       }
 //       if (match)
 //         return i;
 //     }
 //   }
   ConstantValue* cv = new ConstantValue(bt, *con);
   int index = _constants.append(cv);
   // long and double entries take 2 slots, we add another empty entry.
   if (type2size[bt] == 2)
     (void) _constants.append(NULL);
   return index;
 }
 bool MethodHandleCompiler::check_non_bcp_klasses(Handle method_type, TRAPS) {
   bool res = false;
   for (int i = -1, len = java_lang_invoke_MethodType::ptype_count(method_type()); i < len; i++) {
     oop ptype = (i == -1
                  ? java_lang_invoke_MethodType::rtype(method_type())
                  : java_lang_invoke_MethodType::ptype(method_type(), i));
     res |= check_non_bcp_klass(java_lang_Class::as_klassOop(ptype), CHECK_(false));
   }
   return res;
 }
 bool MethodHandleCompiler::check_non_bcp_klass(klassOop klass, TRAPS) {
   klass = methodOopDesc::check_non_bcp_klass(klass);
   if (klass != NULL) {
     Symbol* name = Klass::cast(klass)->name();
     for (int i = _non_bcp_klasses.length() - 1; i >= 0; i--) {
       klassOop k2 = _non_bcp_klasses.at(i)();
       if (Klass::cast(k2)->name() == name) {
         if (k2 != klass) {
           lose(err_msg("unsupported klass name alias %s", name->as_utf8()), THREAD);
         }
         return true;
       }
     }
     _non_bcp_klasses.append(KlassHandle(THREAD, klass));
     return true;
   }
   return false;
 }
 void MethodHandleCompiler::record_non_bcp_klasses() {
   // Append extra klasses to constant pool, to guide klass lookup.
   for (int k = 0; k < _non_bcp_klasses.length(); k++) {
     klassOop non_bcp_klass = _non_bcp_klasses.at(k)();
     bool add_to_cp = true;
     for (int j = 1; j < _constants.length(); j++) {
       ConstantValue* cv = _constants.at(j);
       if (cv != NULL && cv->tag() == JVM_CONSTANT_Class
           && cv->klass_oop() == non_bcp_klass) {
         add_to_cp = false;
         break;
       }
     }
     if (add_to_cp)  cpool_klass_put(non_bcp_klass);
   }
 }
 constantPoolHandle MethodHandleCompiler::get_constant_pool(TRAPS) const {
   constantPoolHandle nullHandle;
   constantPoolOop cpool_oop = oopFactory::new_constantPool(_constants.length(),
                                                            oopDesc::IsSafeConc,
                                                            CHECK_(nullHandle));
   constantPoolHandle cpool(THREAD, cpool_oop);
   // Fill the real constant pool skipping the zero element.
   for (int i = 1; i < _constants.length(); i++) {
     ConstantValue* cv = _constants.at(i);
     switch (cv->tag()) {
     case JVM_CONSTANT_Utf8:        cpool->symbol_at_put(       i, cv->symbol()                         ); break;
     case JVM_CONSTANT_Integer:     cpool->int_at_put(          i, cv->get_jint()                       ); break;
     case JVM_CONSTANT_Float:       cpool->float_at_put(        i, cv->get_jfloat()                     ); break;
     case JVM_CONSTANT_Long:        cpool->long_at_put(         i, cv->get_jlong()                      ); break;
     case JVM_CONSTANT_Double:      cpool->double_at_put(       i, cv->get_jdouble()                    ); break;
     case JVM_CONSTANT_Class:       cpool->klass_at_put(        i, cv->klass_oop()                      ); break;
     case JVM_CONSTANT_Methodref:   cpool->method_at_put(       i, cv->first_index(), cv->second_index()); break;
     case JVM_CONSTANT_InterfaceMethodref:
                                 cpool->interface_method_at_put(i, cv->first_index(), cv->second_index()); break;
     case JVM_CONSTANT_NameAndType: cpool->name_and_type_at_put(i, cv->first_index(), cv->second_index()); break;
     case JVM_CONSTANT_Object:      cpool->object_at_put(       i, cv->object_oop()                     ); break;
     default: ShouldNotReachHere();
     }
     switch (cv->tag()) {
     case JVM_CONSTANT_Long:
     case JVM_CONSTANT_Double:
       i++;  // Skip empty entry.
       assert(_constants.at(i) == NULL, "empty entry");
       break;
     }
   }
   cpool->set_preresolution();
   // Set the constant pool holder to the target method's class.
   cpool->set_pool_holder(_target_klass());
   return cpool;
 }
 methodHandle MethodHandleCompiler::get_method_oop(TRAPS) {
   methodHandle empty;
   // Create a method that holds the generated bytecode.  invokedynamic
   // has no receiver, normal MH calls do.
   int flags_bits;
   if (for_invokedynamic())
     flags_bits = (/*JVM_MH_INVOKE_BITS |*/ JVM_ACC_PUBLIC | JVM_ACC_FINAL | JVM_ACC_SYNTHETIC | JVM_ACC_STATIC);
   else
     flags_bits = (/*JVM_MH_INVOKE_BITS |*/ JVM_ACC_PUBLIC | JVM_ACC_FINAL | JVM_ACC_SYNTHETIC);
   // Create a new method
   methodHandle m;
   {
     methodOop m_oop = oopFactory::new_method(bytecode_length(),
                                              accessFlags_from(flags_bits),
 , 0, 0, oopDesc::IsSafeConc, CHECK_(empty));
     m = methodHandle(THREAD, m_oop);
   }
   constantPoolHandle cpool = get_constant_pool(CHECK_(empty));
   m->set_constants(cpool());
   m->set_name_index(_name_index);
   m->set_signature_index(_signature_index);
   m->set_code((address) bytecode());
   m->set_max_stack(_max_stack);
   m->set_max_locals(max_locals());
   m->set_size_of_parameters(_num_params);
   typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array());
   m->set_exception_table(exception_handlers());
   // Rewrite the method and set up the constant pool cache.
   objArrayOop m_array = oopFactory::new_system_objArray(1, CHECK_(empty));
   objArrayHandle methods(THREAD, m_array);
   methods->obj_at_put(0, m());
   Rewriter::rewrite(_target_klass(), cpool, methods, CHECK_(empty));  // Use fake class.
   Rewriter::relocate_and_link(_target_klass(), methods, CHECK_(empty));  // Use fake class.
   // Pre-resolve selected CP cache entries, to avoid problems with class loader scoping.
   constantPoolCacheHandle cpc(THREAD, cpool->cache());
   for (int i = 0; i < cpc->length(); i++) {
     ConstantPoolCacheEntry* e = cpc->entry_at(i);
     assert(!e->is_secondary_entry(), "no indy instructions in here, yet");
     int constant_pool_index = e->constant_pool_index();
     ConstantValue* cv = _constants.at(constant_pool_index);
     if (!cv->has_linkage())  continue;
     methodHandle m = cv->linkage();
     int index;
     switch (cv->tag()) {
     case JVM_CONSTANT_Methodref:
       index = m->vtable_index();
       if (m->is_static()) {
         e->set_method(Bytecodes::_invokestatic, m, index);
       } else {
         e->set_method(Bytecodes::_invokespecial, m, index);
         e->set_method(Bytecodes::_invokevirtual, m, index);
       }
       break;
     case JVM_CONSTANT_InterfaceMethodref:
       index = klassItable::compute_itable_index(m());
       e->set_interface_call(m, index);
       break;
     }
   }
   // Set the invocation counter's count to the invoke count of the
   // original call site.
   InvocationCounter* ic = m->invocation_counter();
   ic->set(InvocationCounter::wait_for_compile, _invoke_count);
   // Create a new MDO
   {
     methodDataOop mdo = oopFactory::new_methodData(m, CHECK_(empty));
     assert(m->method_data() == NULL, "there should not be an MDO yet");
     m->set_method_data(mdo);
     bool found_selectAlternative = false;
     // Iterate over all profile data and set the count of the counter
     // data entries to the original call site counter.
     for (ProfileData* profile_data = mdo->first_data();
          mdo->is_valid(profile_data);
          profile_data = mdo->next_data(profile_data)) {
       if (profile_data->is_CounterData()) {
         CounterData* counter_data = profile_data->as_CounterData();
         counter_data->set_count(_invoke_count);
       }
       if (profile_data->is_BranchData() &&
           profile_data->bci() == _selectAlternative_bci) {
         BranchData* bd = profile_data->as_BranchData();
         bd->set_taken(_taken_count);
         bd->set_not_taken(_not_taken_count);
         found_selectAlternative = true;
       }
     }
     assert(_selectAlternative_bci == -1 || found_selectAlternative, "must have found profile entry");
   }
 #ifndef PRODUCT
   if (TraceMethodHandles) {
     m->print();
     m->print_codes();
   }
 #endif //PRODUCT
   assert(m->is_method_handle_adapter(), "must be recognized as an adapter");
   return m;
 }
 #ifndef PRODUCT
 // MH printer for debugging.
 class MethodHandlePrinter : public MethodHandleWalker {
 private:
   outputStream* _out;
   bool          _verbose;
   int           _temp_num;
   int           _param_state;
   stringStream  _strbuf;
   const char* strbuf() {
     const char* s = _strbuf.as_string();
     _strbuf.reset();
     return s;
   }
   ArgToken token(const char* str, BasicType type) {
     return ArgToken(str, type);
   }
   const char* string(ArgToken token) {
     return token.str();
   }
   void start_params() {
     _param_state <<= 1;
     _out->print("(");
   }
   void end_params() {
     if (_verbose)  _out->print("\n");
     _out->print(") => {");
     _param_state >>= 1;
   }
   void put_type_name(BasicType type, klassOop tk, outputStream* s) {
     const char* kname = NULL;
     if (tk != NULL)
       kname = Klass::cast(tk)->external_name();
     s->print("%s", (kname != NULL) ? kname : type2name(type));
   }
   ArgToken maybe_make_temp(const char* statement_op, BasicType type, const char* temp_name) {
     const char* value = strbuf();
     if (!_verbose)  return token(value, type);
     // make an explicit binding for each separate value
     _strbuf.print("%s%d", temp_name, ++_temp_num);
     const char* temp = strbuf();
     _out->print("\n  %s %s %s = %s;", statement_op, type2name(type), temp, value);
     return token(temp, type);
   }
 public:
   MethodHandlePrinter(Handle root, bool verbose, outputStream* out, TRAPS)
     : MethodHandleWalker(root, false, THREAD),
       _out(out),
       _verbose(verbose),
       _param_state(0),
       _temp_num(0)
   {
     out->print("MethodHandle:");
     java_lang_invoke_MethodType::print_signature(java_lang_invoke_MethodHandle::type(root()), out);
     out->print(" : #");
     start_params();
   }
   virtual ArgToken make_parameter(BasicType type, klassOop tk, int argnum, TRAPS) {
     if (argnum < 0) {
       end_params();
       return token("return", type);
     }
     if ((_param_state & 1) == 0) {
       _param_state |= 1;
       _out->print(_verbose ? "\n  " : "");
     } else {
       _out->print(_verbose ? ",\n  " : ", ");
     }
     if (argnum >= _temp_num)
       _temp_num = argnum;
     // generate an argument name
     _strbuf.print("a%d", argnum);
     const char* arg = strbuf();
     put_type_name(type, tk, _out);
     _out->print(" %s", arg);
     return token(arg, type);
   }
   virtual ArgToken make_oop_constant(oop con, TRAPS) {
     if (con == NULL)
       _strbuf.print("null");
     else
       con->print_value_on(&_strbuf);
     if (_strbuf.size() == 0) {  // yuck
       _strbuf.print("(a ");
       put_type_name(T_OBJECT, con->klass(), &_strbuf);
       _strbuf.print(")");
     }
     return maybe_make_temp("constant", T_OBJECT, "k");
   }
   virtual ArgToken make_prim_constant(BasicType type, jvalue* con, TRAPS) {
     java_lang_boxing_object::print(type, con, &_strbuf);
     return maybe_make_temp("constant", type, "k");
   }
   void print_bytecode_name(Bytecodes::Code op) {
     if (Bytecodes::is_defined(op))
       _strbuf.print("%s", Bytecodes::name(op));
     else
       _strbuf.print("bytecode_%d", (int) op);
   }
   virtual ArgToken make_conversion(BasicType type, klassOop tk, Bytecodes::Code op, const ArgToken& src, TRAPS) {
     print_bytecode_name(op);
     _strbuf.print("(%s", string(src));
     if (tk != NULL) {
       _strbuf.print(", ");
       put_type_name(type, tk, &_strbuf);
     }
     _strbuf.print(")");
     return maybe_make_temp("convert", type, "v");
   }
   virtual ArgToken make_fetch(BasicType type, klassOop tk, Bytecodes::Code op, const ArgToken& base, const ArgToken& offset, TRAPS) {
     _strbuf.print("%s(%s, %s", Bytecodes::name(op), string(base), string(offset));
     if (tk != NULL) {
       _strbuf.print(", ");
       put_type_name(type, tk, &_strbuf);
     }
     _strbuf.print(")");
     return maybe_make_temp("fetch", type, "x");
   }
   virtual ArgToken make_invoke(methodHandle m, vmIntrinsics::ID iid,
                                Bytecodes::Code op, bool tailcall,
                                int argc, ArgToken* argv, TRAPS) {
     Symbol* name;
     Symbol* sig;
     if (m.not_null()) {
       name = m->name();
       sig  = m->signature();
     } else {
       name = vmSymbols::symbol_at(vmIntrinsics::name_for(iid));
       sig  = vmSymbols::symbol_at(vmIntrinsics::signature_for(iid));
     }
     _strbuf.print("%s %s%s(", Bytecodes::name(op), name->as_C_string(), sig->as_C_string());
     for (int i = 0; i < argc; i++) {
       _strbuf.print("%s%s", (i > 0 ? ", " : ""), string(argv[i]));
     }
     _strbuf.print(")");
     if (!tailcall) {
       BasicType rt = char2type(sig->byte_at(sig->utf8_length()-1));
       if (rt == T_ILLEGAL)  rt = T_OBJECT;  // ';' at the end of '(...)L...;'
       return maybe_make_temp("invoke", rt, "x");
     } else {
       const char* ret = strbuf();
       _out->print(_verbose ? "\n  return " : " ");
       _out->print("%s", ret);
       _out->print(_verbose ? "\n}\n" : " }");
     }
     return ArgToken();
   }
   virtual void set_method_handle(oop mh) {
     if (WizardMode && Verbose) {
       tty->print("\n--- next target: ");
       mh->print();
     }
   }
   static void print(Handle root, bool verbose, outputStream* out, TRAPS) {
     ResourceMark rm;
     MethodHandlePrinter printer(root, verbose, out, CHECK);
     printer.walk(CHECK);
     out->print("\n");
   }
   static void print(Handle root, bool verbose = Verbose, outputStream* out = tty) {
     Thread* THREAD = Thread::current();
     ResourceMark rm;
     MethodHandlePrinter printer(root, verbose, out, THREAD);
     if (!HAS_PENDING_EXCEPTION)
       printer.walk(THREAD);
     if (HAS_PENDING_EXCEPTION) {
       oop ex = PENDING_EXCEPTION;
       CLEAR_PENDING_EXCEPTION;
       out->print(" *** ");
       if (printer.lose_message() != NULL)  out->print("%s ", printer.lose_message());
       out->print("}");
     }
     out->print("\n");
   }
 };
 extern "C"
 void print_method_handle(oop mh) {
   if (!mh->is_oop()) {
     tty->print_cr("*** not a method handle: "PTR_FORMAT, (intptr_t)mh);
   } else if (java_lang_invoke_MethodHandle::is_instance(mh)) {
     MethodHandlePrinter::print(mh);
   } else {
     tty->print("*** not a method handle: ");
     mh->print();
   }
 }
 #endif // PRODUCT

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/prims/methodHandleWalk.cpp@94ec88ca68e2 (annotated)

src/share/vm/prims/methodHandleWalk.cpp