1 /*

     2  * Copyright 2008-2010 Sun Microsystems, Inc.  All Rights Reserved.

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

     4  *

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

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

     7  * published by the Free Software Foundation.

     8  *

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

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

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

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

    13  * accompanied this code).

    14  *

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

    16  * 2 along with this work; if not, write to the Free Software Foundation,

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

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    24 

    25 /*

    26  * JSR 292 reference implementation: method handle structure analysis

    27  */

    28 

    29 #include "incls/_precompiled.incl"

    30 #include "incls/_methodHandleWalk.cpp.incl"

    31 

    32 void MethodHandleChain::set_method_handle(Handle mh, TRAPS) {

    33   if (!java_dyn_MethodHandle::is_instance(mh()))  lose("bad method handle", CHECK);

    34 

    35   // set current method handle and unpack partially

    36   _method_handle = mh;

    37   _is_last       = false;

    38   _is_bound      = false;

    39   _arg_slot      = -1;

    40   _arg_type      = T_VOID;

    41   _conversion    = -1;

    42   _last_invoke   = Bytecodes::_nop;  //arbitrary non-garbage

    43 

    44   if (sun_dyn_DirectMethodHandle::is_instance(mh())) {

    45     set_last_method(mh(), THREAD);

    46     return;

    47   }

    48   if (sun_dyn_AdapterMethodHandle::is_instance(mh())) {

    49     _conversion = AdapterMethodHandle_conversion();

    50     assert(_conversion != -1, "bad conv value");

    51     assert(sun_dyn_BoundMethodHandle::is_instance(mh()), "also BMH");

    52   }

    53   if (sun_dyn_BoundMethodHandle::is_instance(mh())) {

    54     if (!is_adapter())          // keep AMH and BMH separate in this model

    55       _is_bound = true;

    56     _arg_slot = BoundMethodHandle_vmargslot();

    57     oop target = MethodHandle_vmtarget_oop();

    58     if (!is_bound() || java_dyn_MethodHandle::is_instance(target)) {

    59       _arg_type = compute_bound_arg_type(target, NULL, _arg_slot, CHECK);

    60     } else if (target != NULL && target->is_method()) {

    61       _arg_type = compute_bound_arg_type(NULL, (methodOop)target, _arg_slot, CHECK);

    62       set_last_method(mh(), CHECK);

    63     } else {

    64       _is_bound = false;  // lose!

    65     }

    66   }

    67   if (is_bound() && _arg_type == T_VOID) {

    68     lose("bad vmargslot", CHECK);

    69   }

    70   if (!is_bound() && !is_adapter()) {

    71     lose("unrecognized MH type", CHECK);

    72   }

    73 }

    74 

    75 void MethodHandleChain::set_last_method(oop target, TRAPS) {

    76   _is_last = true;

    77   klassOop receiver_limit_oop = NULL;

    78   int flags = 0;

    79   methodOop m = MethodHandles::decode_method(target, receiver_limit_oop, flags);

    80   _last_method = methodHandle(THREAD, m);

    81   if ((flags & MethodHandles::_dmf_has_receiver) == 0)

    82     _last_invoke = Bytecodes::_invokestatic;

    83   else if ((flags & MethodHandles::_dmf_does_dispatch) == 0)

    84     _last_invoke = Bytecodes::_invokespecial;

    85   else if ((flags & MethodHandles::_dmf_from_interface) != 0)

    86     _last_invoke = Bytecodes::_invokeinterface;

    87   else

    88     _last_invoke = Bytecodes::_invokevirtual;

    89 }

    90 

    91 BasicType MethodHandleChain::compute_bound_arg_type(oop target, methodOop m, int arg_slot, TRAPS) {

    92   // There is no direct indication of whether the argument is primitive or not.

    93   // It is implied by the _vmentry code, and by the MethodType of the target.

    94   // FIXME: Make it explicit MethodHandleImpl refactors out from MethodHandle

    95   BasicType arg_type = T_VOID;

    96   if (target != NULL) {

    97     oop mtype = java_dyn_MethodHandle::type(target);

    98     int arg_num = MethodHandles::argument_slot_to_argnum(mtype, arg_slot);

    99     if (arg_num >= 0) {

   100       oop ptype = java_dyn_MethodType::ptype(mtype, arg_num);

   101       arg_type = java_lang_Class::as_BasicType(ptype);

   102     }

   103   } else if (m != NULL) {

   104     // figure out the argument type from the slot

   105     // FIXME: make this explicit in the MH

   106     int cur_slot = m->size_of_parameters();

   107     if (arg_slot >= cur_slot)

   108       return T_VOID;

   109     if (!m->is_static()) {

   110       cur_slot -= type2size[T_OBJECT];

   111       if (cur_slot == arg_slot)

   112         return T_OBJECT;

   113     }

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

   115       BasicType bt = ss.type();

   116       cur_slot -= type2size[bt];

   117       if (cur_slot <= arg_slot) {

   118         if (cur_slot == arg_slot)

   119           arg_type = bt;

   120         break;

   121       }

   122     }

   123   }

   124   if (arg_type == T_ARRAY)

   125     arg_type = T_OBJECT;

   126   return arg_type;

   127 }

   128 

   129 void MethodHandleChain::lose(const char* msg, TRAPS) {

   130   _lose_message = msg;

   131   if (!THREAD->is_Java_thread() || ((JavaThread*)THREAD)->thread_state() != _thread_in_vm) {

   132     // throw a preallocated exception

   133     THROW_OOP(Universe::virtual_machine_error_instance());

   134   }

   135   THROW_MSG(vmSymbols::java_lang_InternalError(), msg);

   136 }

   137 

   138 Bytecodes::Code MethodHandleWalker::conversion_code(BasicType src, BasicType dest) {

   139   if (is_subword_type(src)) {

   140     src = T_INT;          // all subword src types act like int

   141   }

   142   if (src == dest) {

   143     return Bytecodes::_nop;

   144   }

   145 

   146 #define SRC_DEST(s,d) (((int)(s) << 4) + (int)(d))

   147   switch (SRC_DEST(src, dest)) {

   148   case SRC_DEST(T_INT, T_LONG):           return Bytecodes::_i2l;

   149   case SRC_DEST(T_INT, T_FLOAT):          return Bytecodes::_i2f;

   150   case SRC_DEST(T_INT, T_DOUBLE):         return Bytecodes::_i2d;

   151   case SRC_DEST(T_INT, T_BYTE):           return Bytecodes::_i2b;

   152   case SRC_DEST(T_INT, T_CHAR):           return Bytecodes::_i2c;

   153   case SRC_DEST(T_INT, T_SHORT):          return Bytecodes::_i2s;

   154 

   155   case SRC_DEST(T_LONG, T_INT):           return Bytecodes::_l2i;

   156   case SRC_DEST(T_LONG, T_FLOAT):         return Bytecodes::_l2f;

   157   case SRC_DEST(T_LONG, T_DOUBLE):        return Bytecodes::_l2d;

   158 

   159   case SRC_DEST(T_FLOAT, T_INT):          return Bytecodes::_f2i;

   160   case SRC_DEST(T_FLOAT, T_LONG):         return Bytecodes::_f2l;

   161   case SRC_DEST(T_FLOAT, T_DOUBLE):       return Bytecodes::_f2d;

   162 

   163   case SRC_DEST(T_DOUBLE, T_INT):         return Bytecodes::_d2i;

   164   case SRC_DEST(T_DOUBLE, T_LONG):        return Bytecodes::_d2l;

   165   case SRC_DEST(T_DOUBLE, T_FLOAT):       return Bytecodes::_d2f;

   166   }

   167 #undef SRC_DEST

   168 

   169   // cannot do it in one step, or at all

   170   return Bytecodes::_illegal;

   171 }

   172 

   173 MethodHandleWalker::ArgToken

   174 MethodHandleWalker::walk(TRAPS) {

   175   walk_incoming_state(CHECK_NULL);

   176 

   177   for (;;) {

   178     set_method_handle(chain().method_handle_oop());

   179 

   180     assert(_outgoing_argc == argument_count_slow(), "empty slots under control");

   181 

   182     if (chain().is_adapter()) {

   183       int conv_op = chain().adapter_conversion_op();

   184       int arg_slot = chain().adapter_arg_slot();

   185       SlotState* arg_state = slot_state(arg_slot);

   186       if (arg_state == NULL

   187           && conv_op > sun_dyn_AdapterMethodHandle::OP_RETYPE_RAW) {

   188         lose("bad argument index", CHECK_NULL);

   189       }

   190 

   191       // perform the adapter action

   192       switch (chain().adapter_conversion_op()) {

   193       case sun_dyn_AdapterMethodHandle::OP_RETYPE_ONLY:

   194       case sun_dyn_AdapterMethodHandle::OP_RETYPE_RAW:

   195         // No changes to arguments; pass the bits through.

   196         // The only difference between the two ops is that the "only" version

   197         // is fully compatible with the verifier, while the "raw" version

   198         // performs a few extra bitwise conversions (like long <-> double).

   199         break;

   200 

   201       case sun_dyn_AdapterMethodHandle::OP_CHECK_CAST: {

   202         // checkcast the Nth outgoing argument in place

   203         klassOop dest_klass = NULL;

   204         BasicType dest = java_lang_Class::as_BasicType(chain().adapter_arg_oop(), &dest_klass);

   205         assert(dest == T_OBJECT, "");

   206         assert(dest == arg_state->_type, "");

   207         arg_state->_arg = make_conversion(T_OBJECT, dest_klass, Bytecodes::_checkcast, arg_state->_arg, CHECK_NULL);

   208         debug_only(dest_klass = (klassOop)badOop);

   209         break;

   210       }

   211 

   212       case sun_dyn_AdapterMethodHandle::OP_PRIM_TO_PRIM: {

   213         // i2l, etc., on the Nth outgoing argument in place

   214         BasicType src = chain().adapter_conversion_src_type(),

   215                   dest = chain().adapter_conversion_dest_type();

   216         Bytecodes::Code bc = conversion_code(src, dest);

   217         ArgToken arg = arg_state->_arg;

   218         if (bc == Bytecodes::_nop) {

   219           break;

   220         } else if (bc != Bytecodes::_illegal) {

   221           arg = make_conversion(dest, NULL, bc, arg, CHECK_NULL);

   222         } else if (is_subword_type(dest)) {

   223           bc = conversion_code(src, T_INT);

   224           if (bc != Bytecodes::_illegal) {

   225             arg = make_conversion(dest, NULL, bc, arg, CHECK_NULL);

   226             bc = conversion_code(T_INT, dest);

   227             arg = make_conversion(dest, NULL, bc, arg, CHECK_NULL);

   228           }

   229         }

   230         if (bc == Bytecodes::_illegal) {

   231           lose("bad primitive conversion", CHECK_NULL);

   232         }

   233         change_argument(src, arg_slot, dest, arg);

   234         break;

   235       }

   236 

   237       case sun_dyn_AdapterMethodHandle::OP_REF_TO_PRIM: {

   238         // checkcast to wrapper type & call intValue, etc.

   239         BasicType dest = chain().adapter_conversion_dest_type();

   240         ArgToken arg = arg_state->_arg;

   241         arg = make_conversion(T_OBJECT, SystemDictionary::box_klass(dest),

   242                               Bytecodes::_checkcast, arg, CHECK_NULL);

   243         vmIntrinsics::ID unboxer = vmIntrinsics::for_unboxing(dest);

   244         if (unboxer == vmIntrinsics::_none) {

   245           lose("no unboxing method", CHECK_NULL);

   246         }

   247         ArgToken arglist[2];

   248         arglist[0] = arg;       // outgoing 'this'

   249         arglist[1] = NULL;      // sentinel

   250         arg = make_invoke(NULL, unboxer, Bytecodes::_invokevirtual, false, 1, &arglist[0], CHECK_NULL);

   251         change_argument(T_OBJECT, arg_slot, dest, arg);

   252         break;

   253       }

   254 

   255       case sun_dyn_AdapterMethodHandle::OP_PRIM_TO_REF: {

   256         // call wrapper type.valueOf

   257         BasicType src = chain().adapter_conversion_src_type();

   258         ArgToken arg = arg_state->_arg;

   259         vmIntrinsics::ID boxer = vmIntrinsics::for_boxing(src);

   260         if (boxer == vmIntrinsics::_none) {

   261           lose("no boxing method", CHECK_NULL);

   262         }

   263         ArgToken arglist[2];

   264         arglist[0] = arg;       // outgoing value

   265         arglist[1] = NULL;      // sentinel

   266         arg = make_invoke(NULL, boxer, Bytecodes::_invokevirtual, false, 1, &arglist[0], CHECK_NULL);

   267         change_argument(src, arg_slot, T_OBJECT, arg);

   268         break;

   269       }

   270 

   271       case sun_dyn_AdapterMethodHandle::OP_SWAP_ARGS: {

   272         int dest_arg_slot = chain().adapter_conversion_vminfo();

   273         if (!slot_has_argument(dest_arg_slot)) {

   274           lose("bad swap index", CHECK_NULL);

   275         }

   276         // a simple swap between two arguments

   277         SlotState* dest_arg_state = slot_state(dest_arg_slot);

   278         SlotState temp = (*dest_arg_state);

   279         (*dest_arg_state) = (*arg_state);

   280         (*arg_state) = temp;

   281         break;

   282       }

   283 

   284       case sun_dyn_AdapterMethodHandle::OP_ROT_ARGS: {

   285         int dest_arg_slot = chain().adapter_conversion_vminfo();

   286         if (!slot_has_argument(dest_arg_slot) || arg_slot == dest_arg_slot) {

   287           lose("bad rotate index", CHECK_NULL);

   288         }

   289         SlotState* dest_arg_state = slot_state(dest_arg_slot);

   290         // Rotate the source argument (plus following N slots) into the

   291         // position occupied by the dest argument (plus following N slots).

   292         int rotate_count = type2size[dest_arg_state->_type];

   293         // (no other rotate counts are currently supported)

   294         if (arg_slot < dest_arg_slot) {

   295           for (int i = 0; i < rotate_count; i++) {

   296             SlotState temp = _outgoing.at(arg_slot);

   297             _outgoing.remove_at(arg_slot);

   298             _outgoing.insert_before(dest_arg_slot + rotate_count - 1, temp);

   299           }

   300         } else { // arg_slot > dest_arg_slot

   301           for (int i = 0; i < rotate_count; i++) {

   302             SlotState temp = _outgoing.at(arg_slot + rotate_count - 1);

   303             _outgoing.remove_at(arg_slot + rotate_count - 1);

   304             _outgoing.insert_before(dest_arg_slot, temp);

   305           }

   306         }

   307         break;

   308       }

   309 

   310       case sun_dyn_AdapterMethodHandle::OP_DUP_ARGS: {

   311         int dup_slots = chain().adapter_conversion_stack_pushes();

   312         if (dup_slots <= 0) {

   313           lose("bad dup count", CHECK_NULL);

   314         }

   315         for (int i = 0; i < dup_slots; i++) {

   316           SlotState* dup = slot_state(arg_slot + 2*i);

   317           if (dup == NULL)              break;  // safety net

   318           if (dup->_type != T_VOID)     _outgoing_argc += 1;

   319           _outgoing.insert_before(i, (*dup));

   320         }

   321         break;

   322       }

   323 

   324       case sun_dyn_AdapterMethodHandle::OP_DROP_ARGS: {

   325         int drop_slots = -chain().adapter_conversion_stack_pushes();

   326         if (drop_slots <= 0) {

   327           lose("bad drop count", CHECK_NULL);

   328         }

   329         for (int i = 0; i < drop_slots; i++) {

   330           SlotState* drop = slot_state(arg_slot);

   331           if (drop == NULL)             break;  // safety net

   332           if (drop->_type != T_VOID)    _outgoing_argc -= 1;

   333           _outgoing.remove_at(arg_slot);

   334         }

   335         break;

   336       }

   337 

   338       case sun_dyn_AdapterMethodHandle::OP_COLLECT_ARGS: { //NYI, may GC

   339         lose("unimplemented", CHECK_NULL);

   340         break;

   341       }

   342 

   343       case sun_dyn_AdapterMethodHandle::OP_SPREAD_ARGS: {

   344         klassOop array_klass_oop = NULL;

   345         BasicType array_type = java_lang_Class::as_BasicType(chain().adapter_arg_oop(),

   346                                                              &array_klass_oop);

   347         assert(array_type == T_OBJECT, "");

   348         assert(Klass::cast(array_klass_oop)->oop_is_array(), "");

   349         arrayKlassHandle array_klass(THREAD, array_klass_oop);

   350         debug_only(array_klass_oop = (klassOop)badOop);

   351 

   352         klassOop element_klass_oop = NULL;

   353         BasicType element_type = java_lang_Class::as_BasicType(array_klass->component_mirror(),

   354                                                                &element_klass_oop);

   355         KlassHandle element_klass(THREAD, element_klass_oop);

   356         debug_only(element_klass_oop = (klassOop)badOop);

   357 

   358         // Fetch the argument, which we will cast to the required array type.

   359         assert(arg_state->_type == T_OBJECT, "");

   360         ArgToken array_arg = arg_state->_arg;

   361         array_arg = make_conversion(T_OBJECT, array_klass(), Bytecodes::_checkcast, array_arg, CHECK_NULL);

   362         change_argument(T_OBJECT, arg_slot, T_VOID, NULL);

   363 

   364         // Check the required length.

   365         int spread_slots = 1 + chain().adapter_conversion_stack_pushes();

   366         int spread_length = spread_slots;

   367         if (type2size[element_type] == 2) {

   368           if (spread_slots % 2 != 0)  spread_slots = -1;  // force error

   369           spread_length = spread_slots / 2;

   370         }

   371         if (spread_slots < 0) {

   372           lose("bad spread length", CHECK_NULL);

   373         }

   374 

   375         jvalue   length_jvalue;  length_jvalue.i = spread_length;

   376         ArgToken length_arg = make_prim_constant(T_INT, &length_jvalue, CHECK_NULL);

   377         // Call a built-in method known to the JVM to validate the length.

   378         ArgToken arglist[3];

   379         arglist[0] = array_arg;  // value to check

   380         arglist[1] = length_arg; // length to check

   381         arglist[2] = NULL;       // sentinel

   382         make_invoke(NULL, vmIntrinsics::_checkSpreadArgument,

   383                     Bytecodes::_invokestatic, false, 3, &arglist[0], CHECK_NULL);

   384 

   385         // Spread out the array elements.

   386         Bytecodes::Code aload_op = Bytecodes::_aaload;

   387         if (element_type != T_OBJECT) {

   388           lose("primitive array NYI", CHECK_NULL);

   389         }

   390         int ap = arg_slot;

   391         for (int i = 0; i < spread_length; i++) {

   392           jvalue   offset_jvalue;  offset_jvalue.i = i;

   393           ArgToken offset_arg = make_prim_constant(T_INT, &offset_jvalue, CHECK_NULL);

   394           ArgToken element_arg = make_fetch(element_type, element_klass(), aload_op, array_arg, offset_arg, CHECK_NULL);

   395           change_argument(T_VOID, ap, element_type, element_arg);

   396           ap += type2size[element_type];

   397         }

   398         break;

   399       }

   400 

   401       case sun_dyn_AdapterMethodHandle::OP_FLYBY: //NYI, runs Java code

   402       case sun_dyn_AdapterMethodHandle::OP_RICOCHET: //NYI, runs Java code

   403         lose("unimplemented", CHECK_NULL);

   404         break;

   405 

   406       default:

   407         lose("bad adapter conversion", CHECK_NULL);

   408         break;

   409       }

   410     }

   411 

   412     if (chain().is_bound()) {

   413       // push a new argument

   414       BasicType arg_type  = chain().bound_arg_type();

   415       jint      arg_slot  = chain().bound_arg_slot();

   416       oop       arg_oop   = chain().bound_arg_oop();

   417       ArgToken  arg       = NULL;

   418       if (arg_type == T_OBJECT) {

   419         arg = make_oop_constant(arg_oop, CHECK_NULL);

   420       } else {

   421         jvalue arg_value;

   422         BasicType bt = java_lang_boxing_object::get_value(arg_oop, &arg_value);

   423         if (bt == arg_type) {

   424           arg = make_prim_constant(arg_type, &arg_value, CHECK_NULL);

   425         } else {

   426           lose("bad bound value", CHECK_NULL);

   427         }

   428       }

   429       debug_only(arg_oop = badOop);

   430       change_argument(T_VOID, arg_slot, arg_type, arg);

   431     }

   432 

   433     // this test must come after the body of the loop

   434     if (!chain().is_last()) {

   435       chain().next(CHECK_NULL);

   436     } else {

   437       break;

   438     }

   439   }

   440 

   441   // finish the sequence with a tail-call to the ultimate target

   442   // parameters are passed in logical order (recv 1st), not slot order

   443   ArgToken* arglist = NEW_RESOURCE_ARRAY(ArgToken, _outgoing.length() + 1);

   444   int ap = 0;

   445   for (int i = _outgoing.length() - 1; i >= 0; i--) {

   446     SlotState* arg_state = slot_state(i);

   447     if (arg_state->_type == T_VOID)  continue;

   448     arglist[ap++] = _outgoing.at(i)._arg;

   449   }

   450   assert(ap == _outgoing_argc, "");

   451   arglist[ap] = NULL; // add a sentinel, for the sake of asserts

   452   return make_invoke(chain().last_method_oop(),

   453                      vmIntrinsics::_none,

   454                      chain().last_invoke_code(), true,

   455                      ap, arglist, THREAD);

   456 }

   457 

   458 void MethodHandleWalker::walk_incoming_state(TRAPS) {

   459   Handle mtype(THREAD, chain().method_type_oop());

   460   int nptypes = java_dyn_MethodType::ptype_count(mtype());

   461   _outgoing_argc = nptypes;

   462   int argp = nptypes - 1;

   463   if (argp >= 0) {

   464     _outgoing.at_grow(argp, make_state(T_VOID, NULL)); // presize

   465   }

   466   for (int i = 0; i < nptypes; i++) {

   467     klassOop  arg_type_klass = NULL;

   468     BasicType arg_type = java_lang_Class::as_BasicType(

   469                 java_dyn_MethodType::ptype(mtype(), i), &arg_type_klass);

   470     ArgToken  arg = make_parameter(arg_type, arg_type_klass, i, CHECK);

   471     debug_only(arg_type_klass = (klassOop)NULL);

   472     _outgoing.at_put(argp, make_state(arg_type, arg));

   473     if (type2size[arg_type] == 2) {

   474       // add the extra slot, so we can model the JVM stack

   475       _outgoing.insert_before(argp+1, make_state(T_VOID, NULL));

   476     }

   477     --argp;

   478   }

   479   // call make_parameter at the end of the list for the return type

   480   klassOop  ret_type_klass = NULL;

   481   BasicType ret_type = java_lang_Class::as_BasicType(

   482               java_dyn_MethodType::rtype(mtype()), &ret_type_klass);

   483   ArgToken  ret = make_parameter(ret_type, ret_type_klass, -1, CHECK);

   484   // ignore ret; client can catch it if needed

   485 }

   486 

   487 // this is messy because some kinds of arguments are paired with

   488 // companion slots containing an empty value

   489 void MethodHandleWalker::change_argument(BasicType old_type, int slot, BasicType new_type,

   490                                          MethodHandleWalker::ArgToken new_arg) {

   491   int old_size = type2size[old_type];

   492   int new_size = type2size[new_type];

   493   if (old_size == new_size) {

   494     // simple case first

   495     _outgoing.at_put(slot, make_state(new_type, new_arg));

   496   } else if (old_size > new_size) {

   497     for (int i = old_size-1; i >= new_size; i++) {

   498       assert((i != 0) == (_outgoing.at(slot + i)._type == T_VOID), "");

   499       _outgoing.remove_at(slot + i);

   500     }

   501     if (new_size > 0)

   502       _outgoing.at_put(slot, make_state(new_type, new_arg));

   503     else

   504       _outgoing_argc -= 1;      // deleted a real argument

   505   } else {

   506     for (int i = old_size; i < new_size; i++) {

   507       _outgoing.insert_before(slot+i, make_state(T_VOID, NULL));

   508     }

   509     _outgoing.at_put(slot, make_state(new_type, new_arg));

   510     if (old_size == 0)

   511       _outgoing_argc += 1;      // inserted a real argument

   512   }

   513 }

   514 

   515 

   516 #ifdef ASSERT

   517 int MethodHandleWalker::argument_count_slow() {

   518   int args_seen = 0;

   519   for (int i = _outgoing.length() - 1; i >= 0; i--) {

   520     if (_outgoing.at(i)._type != T_VOID) {

   521       ++args_seen;

   522     }

   523   }

   524   return args_seen;

   525 }

   526 #endif

   527 

   528 

   529 void MethodHandleCompiler::compile(TRAPS) {

   530   assert(_thread == THREAD, "must be same thread");

   531 

   532   _constant_oops.append(Handle());  // element zero is always the null constant

   533   _constant_prims.append(NULL);

   534   {

   535     symbolOop sig

   536       = java_dyn_MethodType::as_signature(chain().method_type_oop(), true, CHECK);

   537     _signature_index = find_oop_constant(sig);

   538     assert(signature() == sig, "");

   539   }

   540 

   541   walk(CHECK);

   542 }

   543 

   544 MethodHandleWalker::ArgToken

   545 MethodHandleCompiler::make_conversion(BasicType type, klassOop tk, Bytecodes::Code op,

   546                                       MethodHandleWalker::ArgToken src, TRAPS) {

   547   Unimplemented();

   548   return NULL;

   549 }

   550 

   551 MethodHandleWalker::ArgToken

   552 MethodHandleCompiler::make_invoke(methodOop m, vmIntrinsics::ID iid,

   553                                   Bytecodes::Code op, bool tailcall,

   554                                   int argc, MethodHandleWalker::ArgToken* argv,

   555                                   TRAPS) {

   556   // If tailcall, we have walked all the way to a direct method handle.

   557   // Otherwise, make a recursive call to some helper routine.

   558 #ifdef ASSERT

   559   switch (op) {

   560   case Bytecodes::_invokevirtual:

   561   case Bytecodes::_invokespecial:

   562   case Bytecodes::_invokestatic:

   563   case Bytecodes::_invokeinterface:

   564     break;

   565   default:

   566     ShouldNotReachHere();

   567   }

   568 #endif //ASSERT

   569   _bytes.put((char) op);

   570 

   571   Unimplemented();

   572   return NULL;

   573 }

   574 

   575 MethodHandleWalker::ArgToken

   576 MethodHandleCompiler::make_fetch(BasicType type, klassOop tk, Bytecodes::Code op,

   577                                  MethodHandleWalker::ArgToken base,

   578                                  MethodHandleWalker::ArgToken offset,

   579                                  TRAPS) {

   580   Unimplemented();

   581   return NULL;

   582 }

   583 

   584 int MethodHandleCompiler::find_oop_constant(oop con) {

   585   if (con == NULL)  return 0;

   586   for (int i = 1, imax = _constant_oops.length(); i < imax; i++) {

   587     if (_constant_oops.at(i) == con)

   588       return i;

   589   }

   590   _constant_prims.append(NULL);

   591   return _constant_oops.append(con);

   592 }

   593 

   594 int MethodHandleCompiler::find_prim_constant(BasicType bt, jvalue* con) {

   595   jvalue con_copy;

   596   assert(bt < T_OBJECT, "");

   597   if (type2aelembytes(bt) < jintSize) {

   598     // widen to int

   599     con_copy = (*con);

   600     con = &con_copy;

   601     switch (bt) {

   602     case T_BOOLEAN: con->i = (con->z ? 1 : 0); break;

   603     case T_BYTE:    con->i = con->b;           break;

   604     case T_CHAR:    con->i = con->c;           break;

   605     case T_SHORT:   con->i = con->s;           break;

   606     default: ShouldNotReachHere();

   607     }

   608     bt = T_INT;

   609   }

   610   for (int i = 1, imax = _constant_prims.length(); i < imax; i++) {

   611     PrimCon* pcon = _constant_prims.at(i);

   612     if (pcon != NULL && pcon->_type == bt) {

   613       bool match = false;

   614       switch (type2size[bt]) {

   615       case 1:  if (pcon->_value.i == con->i)  match = true;  break;

   616       case 2:  if (pcon->_value.j == con->j)  match = true;  break;

   617       }

   618       if (match)

   619         return i;

   620     }

   621   }

   622   PrimCon* pcon = new PrimCon();

   623   pcon->_type = bt;

   624   pcon->_value = (*con);

   625   _constant_oops.append(Handle());

   626   return _constant_prims.append(pcon);

   627 }

   628 

   629 

   630 #ifndef PRODUCT

   631 

   632 // MH printer for debugging.

   633 

   634 class MethodHandlePrinter : public MethodHandleWalker {

   635 private:

   636   outputStream* _out;

   637   bool          _verbose;

   638   int           _temp_num;

   639   stringStream  _strbuf;

   640   const char* strbuf() {

   641     const char* s = _strbuf.as_string();

   642     _strbuf.reset();

   643     return s;

   644   }

   645   ArgToken token(const char* str) {

   646     return (ArgToken) str;

   647   }

   648   void start_params() {

   649     _out->print("(");

   650   }

   651   void end_params() {

   652     if (_verbose)  _out->print("\n");

   653     _out->print(") => {");

   654   }

   655   void put_type_name(BasicType type, klassOop tk, outputStream* s) {

   656     const char* kname = NULL;

   657     if (tk != NULL)

   658       kname = Klass::cast(tk)->external_name();

   659     s->print("%s", (kname != NULL) ? kname : type2name(type));

   660   }

   661   ArgToken maybe_make_temp(const char* statement_op, BasicType type, const char* temp_name) {

   662     const char* value = strbuf();

   663     if (!_verbose)  return token(value);

   664     // make an explicit binding for each separate value

   665     _strbuf.print("%s%d", temp_name, ++_temp_num);

   666     const char* temp = strbuf();

   667     _out->print("\n  %s %s %s = %s;", statement_op, type2name(type), temp, value);

   668     return token(temp);

   669   }

   670 

   671 public:

   672   MethodHandlePrinter(Handle root, bool verbose, outputStream* out, TRAPS)

   673     : MethodHandleWalker(root, THREAD),

   674       _out(out),

   675       _verbose(verbose),

   676       _temp_num(0)

   677   {

   678     start_params();

   679   }

   680   virtual ArgToken make_parameter(BasicType type, klassOop tk, int argnum, TRAPS) {

   681     if (argnum < 0) {

   682       end_params();

   683       return NULL;

   684     }

   685     if (argnum == 0) {

   686       _out->print(_verbose ? "\n  " : "");

   687     } else {

   688       _out->print(_verbose ? ",\n  " : ", ");

   689     }

   690     if (argnum >= _temp_num)

   691       _temp_num = argnum;

   692     // generate an argument name

   693     _strbuf.print("a%d", argnum);

   694     const char* arg = strbuf();

   695     put_type_name(type, tk, _out);

   696     _out->print(" %s", arg);

   697     return token(arg);

   698   }

   699   virtual ArgToken make_oop_constant(oop con, TRAPS) {

   700     if (con == NULL)

   701       _strbuf.print("null");

   702     else

   703       con->print_value_on(&_strbuf);

   704     if (_strbuf.size() == 0) {  // yuck

   705       _strbuf.print("(a ");

   706       put_type_name(T_OBJECT, con->klass(), &_strbuf);

   707       _strbuf.print(")");

   708     }

   709     return maybe_make_temp("constant", T_OBJECT, "k");

   710   }

   711   virtual ArgToken make_prim_constant(BasicType type, jvalue* con, TRAPS) {

   712     java_lang_boxing_object::print(type, con, &_strbuf);

   713     return maybe_make_temp("constant", type, "k");

   714   }

   715   virtual ArgToken make_conversion(BasicType type, klassOop tk, Bytecodes::Code op, ArgToken src, TRAPS) {

   716     _strbuf.print("%s(%s", Bytecodes::name(op), (const char*)src);

   717     if (tk != NULL) {

   718       _strbuf.print(", ");

   719       put_type_name(type, tk, &_strbuf);

   720     }

   721     _strbuf.print(")");

   722     return maybe_make_temp("convert", type, "v");

   723   }

   724   virtual ArgToken make_fetch(BasicType type, klassOop tk, Bytecodes::Code op, ArgToken base, ArgToken offset, TRAPS) {

   725     _strbuf.print("%s(%s, %s", Bytecodes::name(op), (const char*)base, (const char*)offset);

   726     if (tk != NULL) {

   727       _strbuf.print(", ");

   728       put_type_name(type, tk, &_strbuf);

   729     }

   730     _strbuf.print(")");

   731     return maybe_make_temp("fetch", type, "x");

   732   }

   733   virtual ArgToken make_invoke(methodOop m, vmIntrinsics::ID iid,

   734                                Bytecodes::Code op, bool tailcall,

   735                                int argc, ArgToken* argv, TRAPS) {

   736     symbolOop name, sig;

   737     if (m != NULL) {

   738       name = m->name();

   739       sig  = m->signature();

   740     } else {

   741       name = vmSymbols::symbol_at(vmIntrinsics::name_for(iid));

   742       sig  = vmSymbols::symbol_at(vmIntrinsics::signature_for(iid));

   743     }

   744     _strbuf.print("%s %s%s(", Bytecodes::name(op), name->as_C_string(), sig->as_C_string());

   745     for (int i = 0; i < argc; i++) {

   746       _strbuf.print("%s%s", (i > 0 ? ", " : ""), (const char*)argv[i]);

   747     }

   748     _strbuf.print(")");

   749     if (!tailcall) {

   750       BasicType rt = char2type(sig->byte_at(sig->utf8_length()-1));

   751       if (rt == T_ILLEGAL)  rt = T_OBJECT;  // ';' at the end of '(...)L...;'

   752       return maybe_make_temp("invoke", rt, "x");

   753     } else {

   754       const char* ret = strbuf();

   755       _out->print(_verbose ? "\n  return " : " ");

   756       _out->print("%s", ret);

   757       _out->print(_verbose ? "\n}\n" : " }");

   758     }

   759     return ArgToken();

   760   }

   761 

   762   virtual void set_method_handle(oop mh) {

   763     if (WizardMode && Verbose) {

   764       tty->print("\n--- next target: ");

   765       mh->print();

   766     }

   767   }

   768 

   769   static void print(Handle root, bool verbose, outputStream* out, TRAPS) {

   770     ResourceMark rm;

   771     MethodHandlePrinter printer(root, verbose, out, CHECK);

   772     printer.walk(CHECK);

   773     out->print("\n");

   774   }

   775   static void print(Handle root, bool verbose = Verbose, outputStream* out = tty) {

   776     EXCEPTION_MARK;

   777     ResourceMark rm;

   778     MethodHandlePrinter printer(root, verbose, out, THREAD);

   779     if (!HAS_PENDING_EXCEPTION)

   780       printer.walk(THREAD);

   781     if (HAS_PENDING_EXCEPTION) {

   782       oop ex = PENDING_EXCEPTION;

   783       CLEAR_PENDING_EXCEPTION;

   784       out->print("\n*** ");

   785       if (ex != Universe::virtual_machine_error_instance())

   786         ex->print_on(out);

   787       else

   788         out->print("lose: %s", printer.lose_message());

   789       out->print("\n}\n");

   790     }

   791     out->print("\n");

   792   }

   793 };

   794 

   795 extern "C"

   796 void print_method_handle(oop mh) {

   797   if (java_dyn_MethodHandle::is_instance(mh)) {

   798     MethodHandlePrinter::print(mh);

   799   } else {

   800     tty->print("*** not a method handle: ");

   801     mh->print();

   802   }

   803 }

   804 

   805 #endif // PRODUCT