1 /* 2 * Copyright (c) 2008, 2011, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/symbolTable.hpp" 27 #include "interpreter/interpreter.hpp" 28 #include "interpreter/oopMapCache.hpp" 29 #include "memory/allocation.inline.hpp" 30 #include "memory/oopFactory.hpp" 31 #include "prims/methodHandles.hpp" 32 #include "prims/methodHandleWalk.hpp" 33 #include "runtime/javaCalls.hpp" 34 #include "runtime/reflection.hpp" 35 #include "runtime/signature.hpp" 36 #include "runtime/stubRoutines.hpp" 37 38 /* 39 * JSR 292 reference implementation: method handles 40 */ 41 42 bool MethodHandles::_enabled = false; // set true after successful native linkage 43 44 MethodHandleEntry* MethodHandles::_entries[MethodHandles::_EK_LIMIT] = {NULL}; 45 const char* MethodHandles::_entry_names[_EK_LIMIT+1] = { 46 "raise_exception", 47 "invokestatic", // how a MH emulates invokestatic 48 "invokespecial", // ditto for the other invokes... 49 "invokevirtual", 50 "invokeinterface", 51 "bound_ref", // these are for BMH... 52 "bound_int", 53 "bound_long", 54 "bound_ref_direct", // (direct versions have a direct methodOop) 55 "bound_int_direct", 56 "bound_long_direct", 57 58 // starting at _adapter_mh_first: 59 "adapter_retype_only", // these are for AMH... 60 "adapter_retype_raw", 61 "adapter_check_cast", 62 "adapter_prim_to_prim", 63 "adapter_ref_to_prim", 64 "adapter_prim_to_ref", 65 "adapter_swap_args", 66 "adapter_rot_args", 67 "adapter_dup_args", 68 "adapter_drop_args", 69 "adapter_collect_args", 70 "adapter_spread_args", 71 "adapter_fold_args", 72 "adapter_unused_13", 73 74 // optimized adapter types: 75 "adapter_swap_args/1", 76 "adapter_swap_args/2", 77 "adapter_rot_args/1,up", 78 "adapter_rot_args/1,down", 79 "adapter_rot_args/2,up", 80 "adapter_rot_args/2,down", 81 "adapter_prim_to_prim/i2i", 82 "adapter_prim_to_prim/l2i", 83 "adapter_prim_to_prim/d2f", 84 "adapter_prim_to_prim/i2l", 85 "adapter_prim_to_prim/f2d", 86 "adapter_ref_to_prim/unboxi", 87 "adapter_ref_to_prim/unboxl", 88 89 // return value handlers for collect/filter/fold adapters: 90 "return/ref", 91 "return/int", 92 "return/long", 93 "return/float", 94 "return/double", 95 "return/void", 96 "return/S0/ref", 97 "return/S1/ref", 98 "return/S2/ref", 99 "return/S3/ref", 100 "return/S4/ref", 101 "return/S5/ref", 102 "return/any", 103 104 // spreading (array length cases 0, 1, ...) 105 "adapter_spread/0", 106 "adapter_spread/1/ref", 107 "adapter_spread/2/ref", 108 "adapter_spread/3/ref", 109 "adapter_spread/4/ref", 110 "adapter_spread/5/ref", 111 "adapter_spread/ref", 112 "adapter_spread/byte", 113 "adapter_spread/char", 114 "adapter_spread/short", 115 "adapter_spread/int", 116 "adapter_spread/long", 117 "adapter_spread/float", 118 "adapter_spread/double", 119 120 // blocking filter/collect conversions: 121 "adapter_collect/ref", 122 "adapter_collect/int", 123 "adapter_collect/long", 124 "adapter_collect/float", 125 "adapter_collect/double", 126 "adapter_collect/void", 127 "adapter_collect/0/ref", 128 "adapter_collect/1/ref", 129 "adapter_collect/2/ref", 130 "adapter_collect/3/ref", 131 "adapter_collect/4/ref", 132 "adapter_collect/5/ref", 133 "adapter_filter/S0/ref", 134 "adapter_filter/S1/ref", 135 "adapter_filter/S2/ref", 136 "adapter_filter/S3/ref", 137 "adapter_filter/S4/ref", 138 "adapter_filter/S5/ref", 139 "adapter_collect/2/S0/ref", 140 "adapter_collect/2/S1/ref", 141 "adapter_collect/2/S2/ref", 142 "adapter_collect/2/S3/ref", 143 "adapter_collect/2/S4/ref", 144 "adapter_collect/2/S5/ref", 145 146 // blocking fold conversions: 147 "adapter_fold/ref", 148 "adapter_fold/int", 149 "adapter_fold/long", 150 "adapter_fold/float", 151 "adapter_fold/double", 152 "adapter_fold/void", 153 "adapter_fold/1/ref", 154 "adapter_fold/2/ref", 155 "adapter_fold/3/ref", 156 "adapter_fold/4/ref", 157 "adapter_fold/5/ref", 158 159 NULL 160 }; 161 162 // Adapters. 163 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL; 164 int MethodHandles::_adapter_code_size = StubRoutines::method_handles_adapters_code_size; 165 166 jobject MethodHandles::_raise_exception_method; 167 168 address MethodHandles::_adapter_return_handlers[CONV_TYPE_MASK+1]; 169 170 #ifdef ASSERT 171 bool MethodHandles::spot_check_entry_names() { 172 assert(!strcmp(entry_name(_invokestatic_mh), "invokestatic"), ""); 173 assert(!strcmp(entry_name(_bound_ref_mh), "bound_ref"), ""); 174 assert(!strcmp(entry_name(_adapter_retype_only), "adapter_retype_only"), ""); 175 assert(!strcmp(entry_name(_adapter_fold_args), "adapter_fold_args"), ""); 176 assert(!strcmp(entry_name(_adapter_opt_unboxi), "adapter_ref_to_prim/unboxi"), ""); 177 assert(!strcmp(entry_name(_adapter_opt_spread_char), "adapter_spread/char"), ""); 178 assert(!strcmp(entry_name(_adapter_opt_spread_double), "adapter_spread/double"), ""); 179 assert(!strcmp(entry_name(_adapter_opt_collect_int), "adapter_collect/int"), ""); 180 assert(!strcmp(entry_name(_adapter_opt_collect_0_ref), "adapter_collect/0/ref"), ""); 181 assert(!strcmp(entry_name(_adapter_opt_collect_2_S3_ref), "adapter_collect/2/S3/ref"), ""); 182 assert(!strcmp(entry_name(_adapter_opt_filter_S5_ref), "adapter_filter/S5/ref"), ""); 183 assert(!strcmp(entry_name(_adapter_opt_fold_3_ref), "adapter_fold/3/ref"), ""); 184 assert(!strcmp(entry_name(_adapter_opt_fold_void), "adapter_fold/void"), ""); 185 return true; 186 } 187 #endif 188 189 190 //------------------------------------------------------------------------------ 191 // MethodHandles::generate_adapters 192 // 193 void MethodHandles::generate_adapters() { 194 #ifdef TARGET_ARCH_NYI_6939861 195 if (FLAG_IS_DEFAULT(UseRicochetFrames)) UseRicochetFrames = false; 196 #endif 197 if (!EnableInvokeDynamic || SystemDictionary::MethodHandle_klass() == NULL) return; 198 199 assert(_adapter_code == NULL, "generate only once"); 200 201 ResourceMark rm; 202 TraceTime timer("MethodHandles adapters generation", TraceStartupTime); 203 _adapter_code = MethodHandlesAdapterBlob::create(_adapter_code_size); 204 if (_adapter_code == NULL) 205 vm_exit_out_of_memory(_adapter_code_size, "CodeCache: no room for MethodHandles adapters"); 206 CodeBuffer code(_adapter_code); 207 MethodHandlesAdapterGenerator g(&code); 208 g.generate(); 209 } 210 211 //------------------------------------------------------------------------------ 212 // MethodHandlesAdapterGenerator::generate 213 // 214 void MethodHandlesAdapterGenerator::generate() { 215 // Generate generic method handle adapters. 216 for (MethodHandles::EntryKind ek = MethodHandles::_EK_FIRST; 217 ek < MethodHandles::_EK_LIMIT; 218 ek = MethodHandles::EntryKind(1 + (int)ek)) { 219 if (MethodHandles::ek_supported(ek)) { 220 StubCodeMark mark(this, "MethodHandle", MethodHandles::entry_name(ek)); 221 MethodHandles::generate_method_handle_stub(_masm, ek); 222 } 223 } 224 } 225 226 227 #ifdef TARGET_ARCH_NYI_6939861 228 // these defs belong in methodHandles_<arch>.cpp 229 frame MethodHandles::ricochet_frame_sender(const frame& fr, RegisterMap *map) { 230 ShouldNotCallThis(); 231 return fr; 232 } 233 void MethodHandles::ricochet_frame_oops_do(const frame& fr, OopClosure* f, const RegisterMap* reg_map) { 234 ShouldNotCallThis(); 235 } 236 #endif //TARGET_ARCH_NYI_6939861 237 238 239 //------------------------------------------------------------------------------ 240 // MethodHandles::ek_supported 241 // 242 bool MethodHandles::ek_supported(MethodHandles::EntryKind ek) { 243 MethodHandles::EntryKind ek_orig = MethodHandles::ek_original_kind(ek); 244 switch (ek_orig) { 245 case _adapter_unused_13: 246 return false; // not defined yet 247 case _adapter_prim_to_ref: 248 return UseRicochetFrames && conv_op_supported(java_lang_invoke_AdapterMethodHandle::OP_PRIM_TO_REF); 249 case _adapter_collect_args: 250 return UseRicochetFrames && conv_op_supported(java_lang_invoke_AdapterMethodHandle::OP_COLLECT_ARGS); 251 case _adapter_fold_args: 252 return UseRicochetFrames && conv_op_supported(java_lang_invoke_AdapterMethodHandle::OP_FOLD_ARGS); 253 case _adapter_opt_return_any: 254 return UseRicochetFrames; 255 #ifdef TARGET_ARCH_NYI_6939861 256 // ports before 6939861 supported only three kinds of spread ops 257 case _adapter_spread_args: 258 // restrict spreads to three kinds: 259 switch (ek) { 260 case _adapter_opt_spread_0: 261 case _adapter_opt_spread_1: 262 case _adapter_opt_spread_more: 263 break; 264 default: 265 return false; 266 break; 267 } 268 break; 269 #endif //TARGET_ARCH_NYI_6939861 270 } 271 return true; 272 } 273 274 275 void MethodHandles::set_enabled(bool z) { 276 if (_enabled != z) { 277 guarantee(z && EnableInvokeDynamic, "can only enable once, and only if -XX:+EnableInvokeDynamic"); 278 _enabled = z; 279 } 280 } 281 282 // Note: A method which does not have a TRAPS argument cannot block in the GC 283 // or throw exceptions. Such methods are used in this file to do something quick 284 // and local, like parse a data structure. For speed, such methods work on plain 285 // oops, not handles. Trapping methods uniformly operate on handles. 286 287 methodHandle MethodHandles::decode_vmtarget(oop vmtarget, int vmindex, oop mtype, 288 KlassHandle& receiver_limit_result, int& decode_flags_result) { 289 if (vmtarget == NULL) return methodHandle(); 290 assert(methodOopDesc::nonvirtual_vtable_index < 0, "encoding"); 291 if (vmindex < 0) { 292 // this DMH performs no dispatch; it is directly bound to a methodOop 293 // A MemberName may either be directly bound to a methodOop, 294 // or it may use the klass/index form; both forms mean the same thing. 295 methodOop m = decode_methodOop(methodOop(vmtarget), decode_flags_result); 296 if ((decode_flags_result & _dmf_has_receiver) != 0 297 && java_lang_invoke_MethodType::is_instance(mtype)) { 298 // Extract receiver type restriction from mtype.ptypes[0]. 299 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(mtype); 300 oop ptype0 = (ptypes == NULL || ptypes->length() < 1) ? oop(NULL) : ptypes->obj_at(0); 301 if (java_lang_Class::is_instance(ptype0)) 302 receiver_limit_result = java_lang_Class::as_klassOop(ptype0); 303 } 304 if (vmindex == methodOopDesc::nonvirtual_vtable_index) { 305 // this DMH can be an "invokespecial" version 306 decode_flags_result &= ~_dmf_does_dispatch; 307 } else { 308 assert(vmindex == methodOopDesc::invalid_vtable_index, "random vmindex?"); 309 } 310 return m; 311 } else { 312 assert(vmtarget->is_klass(), "must be class or interface"); 313 decode_flags_result |= MethodHandles::_dmf_does_dispatch; 314 decode_flags_result |= MethodHandles::_dmf_has_receiver; 315 receiver_limit_result = (klassOop)vmtarget; 316 Klass* tk = Klass::cast((klassOop)vmtarget); 317 if (tk->is_interface()) { 318 // an itable linkage is <interface, itable index> 319 decode_flags_result |= MethodHandles::_dmf_from_interface; 320 return klassItable::method_for_itable_index((klassOop)vmtarget, vmindex); 321 } else { 322 if (!tk->oop_is_instance()) 323 tk = instanceKlass::cast(SystemDictionary::Object_klass()); 324 return ((instanceKlass*)tk)->method_at_vtable(vmindex); 325 } 326 } 327 } 328 329 // MemberName and DirectMethodHandle have the same linkage to the JVM internals. 330 // (MemberName is the non-operational name used for queries and setup.) 331 332 methodHandle MethodHandles::decode_DirectMethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) { 333 oop vmtarget = java_lang_invoke_DirectMethodHandle::vmtarget(mh); 334 int vmindex = java_lang_invoke_DirectMethodHandle::vmindex(mh); 335 oop mtype = java_lang_invoke_DirectMethodHandle::type(mh); 336 return decode_vmtarget(vmtarget, vmindex, mtype, receiver_limit_result, decode_flags_result); 337 } 338 339 methodHandle MethodHandles::decode_BoundMethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) { 340 assert(java_lang_invoke_BoundMethodHandle::is_instance(mh), ""); 341 assert(mh->klass() != SystemDictionary::AdapterMethodHandle_klass(), ""); 342 for (oop bmh = mh;;) { 343 // Bound MHs can be stacked to bind several arguments. 344 oop target = java_lang_invoke_MethodHandle::vmtarget(bmh); 345 if (target == NULL) return methodHandle(); 346 decode_flags_result |= MethodHandles::_dmf_binds_argument; 347 klassOop tk = target->klass(); 348 if (tk == SystemDictionary::BoundMethodHandle_klass()) { 349 bmh = target; 350 continue; 351 } else { 352 if (java_lang_invoke_MethodHandle::is_subclass(tk)) { 353 //assert(tk == SystemDictionary::DirectMethodHandle_klass(), "end of BMH chain must be DMH"); 354 return decode_MethodHandle(target, receiver_limit_result, decode_flags_result); 355 } else { 356 // Optimized case: binding a receiver to a non-dispatched DMH 357 // short-circuits directly to the methodOop. 358 // (It might be another argument besides a receiver also.) 359 assert(target->is_method(), "must be a simple method"); 360 decode_flags_result |= MethodHandles::_dmf_binds_method; 361 methodOop m = (methodOop) target; 362 if (!m->is_static()) 363 decode_flags_result |= MethodHandles::_dmf_has_receiver; 364 return m; 365 } 366 } 367 } 368 } 369 370 methodHandle MethodHandles::decode_AdapterMethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) { 371 assert(mh->klass() == SystemDictionary::AdapterMethodHandle_klass(), ""); 372 for (oop amh = mh;;) { 373 // Adapter MHs can be stacked to convert several arguments. 374 int conv_op = adapter_conversion_op(java_lang_invoke_AdapterMethodHandle::conversion(amh)); 375 decode_flags_result |= (_dmf_adapter_lsb << conv_op) & _DMF_ADAPTER_MASK; 376 oop target = java_lang_invoke_MethodHandle::vmtarget(amh); 377 if (target == NULL) return methodHandle(); 378 klassOop tk = target->klass(); 379 if (tk == SystemDictionary::AdapterMethodHandle_klass()) { 380 amh = target; 381 continue; 382 } else { 383 // must be a BMH (which will bind some more arguments) or a DMH (for the final call) 384 return MethodHandles::decode_MethodHandle(target, receiver_limit_result, decode_flags_result); 385 } 386 } 387 } 388 389 methodHandle MethodHandles::decode_MethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) { 390 if (mh == NULL) return methodHandle(); 391 klassOop mhk = mh->klass(); 392 assert(java_lang_invoke_MethodHandle::is_subclass(mhk), "must be a MethodHandle"); 393 if (mhk == SystemDictionary::DirectMethodHandle_klass()) { 394 return decode_DirectMethodHandle(mh, receiver_limit_result, decode_flags_result); 395 } else if (mhk == SystemDictionary::BoundMethodHandle_klass()) { 396 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result); 397 } else if (mhk == SystemDictionary::AdapterMethodHandle_klass()) { 398 return decode_AdapterMethodHandle(mh, receiver_limit_result, decode_flags_result); 399 } else if (java_lang_invoke_BoundMethodHandle::is_subclass(mhk)) { 400 // could be a JavaMethodHandle (but not an adapter MH) 401 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result); 402 } else { 403 assert(false, "cannot parse this MH"); 404 return methodHandle(); // random MH? 405 } 406 } 407 408 methodOop MethodHandles::decode_methodOop(methodOop m, int& decode_flags_result) { 409 assert(m->is_method(), ""); 410 if (m->is_static()) { 411 // check that signature begins '(L' or '([' (not '(I', '()', etc.) 412 Symbol* sig = m->signature(); 413 BasicType recv_bt = char2type(sig->byte_at(1)); 414 // Note: recv_bt might be T_ILLEGAL if byte_at(2) is ')' 415 assert(sig->byte_at(0) == '(', "must be method sig"); 416 // if (recv_bt == T_OBJECT || recv_bt == T_ARRAY) 417 // decode_flags_result |= _dmf_has_receiver; 418 } else { 419 // non-static method 420 decode_flags_result |= _dmf_has_receiver; 421 if (!m->can_be_statically_bound() && !m->is_initializer()) { 422 decode_flags_result |= _dmf_does_dispatch; 423 if (Klass::cast(m->method_holder())->is_interface()) 424 decode_flags_result |= _dmf_from_interface; 425 } 426 } 427 return m; 428 } 429 430 431 // A trusted party is handing us a cookie to determine a method. 432 // Let's boil it down to the method oop they really want. 433 methodHandle MethodHandles::decode_method(oop x, KlassHandle& receiver_limit_result, int& decode_flags_result) { 434 decode_flags_result = 0; 435 receiver_limit_result = KlassHandle(); 436 klassOop xk = x->klass(); 437 if (xk == Universe::methodKlassObj()) { 438 return decode_methodOop((methodOop) x, decode_flags_result); 439 } else if (xk == SystemDictionary::MemberName_klass()) { 440 // Note: This only works if the MemberName has already been resolved. 441 return decode_MemberName(x, receiver_limit_result, decode_flags_result); 442 } else if (java_lang_invoke_MethodHandle::is_subclass(xk)) { 443 return decode_MethodHandle(x, receiver_limit_result, decode_flags_result); 444 } else if (xk == SystemDictionary::reflect_Method_klass()) { 445 oop clazz = java_lang_reflect_Method::clazz(x); 446 int slot = java_lang_reflect_Method::slot(x); 447 klassOop k = java_lang_Class::as_klassOop(clazz); 448 if (k != NULL && Klass::cast(k)->oop_is_instance()) 449 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot), 450 decode_flags_result); 451 } else if (xk == SystemDictionary::reflect_Constructor_klass()) { 452 oop clazz = java_lang_reflect_Constructor::clazz(x); 453 int slot = java_lang_reflect_Constructor::slot(x); 454 klassOop k = java_lang_Class::as_klassOop(clazz); 455 if (k != NULL && Klass::cast(k)->oop_is_instance()) 456 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot), 457 decode_flags_result); 458 } else { 459 // unrecognized object 460 assert(!x->is_method(), "already checked"); 461 assert(!java_lang_invoke_MemberName::is_instance(x), "already checked"); 462 } 463 return methodHandle(); 464 } 465 466 467 int MethodHandles::decode_MethodHandle_stack_pushes(oop mh) { 468 if (mh->klass() == SystemDictionary::DirectMethodHandle_klass()) 469 return 0; // no push/pop 470 int this_vmslots = java_lang_invoke_MethodHandle::vmslots(mh); 471 int last_vmslots = 0; 472 oop last_mh = mh; 473 for (;;) { 474 oop target = java_lang_invoke_MethodHandle::vmtarget(last_mh); 475 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) { 476 last_vmslots = java_lang_invoke_MethodHandle::vmslots(target); 477 break; 478 } else if (!java_lang_invoke_MethodHandle::is_instance(target)) { 479 // might be klass or method 480 assert(target->is_method(), "must get here with a direct ref to method"); 481 last_vmslots = methodOop(target)->size_of_parameters(); 482 break; 483 } 484 last_mh = target; 485 } 486 // If I am called with fewer VM slots than my ultimate callee, 487 // it must be that I push the additionally needed slots. 488 // Likewise if am called with more VM slots, I will pop them. 489 return (last_vmslots - this_vmslots); 490 } 491 492 493 // MemberName support 494 495 // import java_lang_invoke_MemberName.* 496 enum { 497 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD, 498 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR, 499 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD, 500 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE, 501 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES, 502 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES, 503 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE, 504 VM_INDEX_UNINITIALIZED = java_lang_invoke_MemberName::VM_INDEX_UNINITIALIZED 505 }; 506 507 Handle MethodHandles::new_MemberName(TRAPS) { 508 Handle empty; 509 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass()); 510 if (!k->is_initialized()) k->initialize(CHECK_(empty)); 511 return Handle(THREAD, k->allocate_instance(THREAD)); 512 } 513 514 void MethodHandles::init_MemberName(oop mname_oop, oop target_oop) { 515 if (target_oop->klass() == SystemDictionary::reflect_Field_klass()) { 516 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() 517 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() 518 int mods = java_lang_reflect_Field::modifiers(target_oop); 519 klassOop k = java_lang_Class::as_klassOop(clazz); 520 int offset = instanceKlass::cast(k)->offset_from_fields(slot); 521 init_MemberName(mname_oop, k, accessFlags_from(mods), offset); 522 } else { 523 KlassHandle receiver_limit; int decode_flags = 0; 524 methodHandle m = MethodHandles::decode_method(target_oop, receiver_limit, decode_flags); 525 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0); 526 init_MemberName(mname_oop, m(), do_dispatch); 527 } 528 } 529 530 void MethodHandles::init_MemberName(oop mname_oop, methodOop m, bool do_dispatch) { 531 int flags = ((m->is_initializer() ? IS_CONSTRUCTOR : IS_METHOD) 532 | (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS )); 533 oop vmtarget = m; 534 int vmindex = methodOopDesc::invalid_vtable_index; // implies no info yet 535 if (!do_dispatch || (flags & IS_CONSTRUCTOR) || m->can_be_statically_bound()) 536 vmindex = methodOopDesc::nonvirtual_vtable_index; // implies never any dispatch 537 assert(vmindex != VM_INDEX_UNINITIALIZED, "Java sentinel value"); 538 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget); 539 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); 540 java_lang_invoke_MemberName::set_flags(mname_oop, flags); 541 java_lang_invoke_MemberName::set_clazz(mname_oop, Klass::cast(m->method_holder())->java_mirror()); 542 } 543 544 void MethodHandles::init_MemberName(oop mname_oop, klassOop field_holder, AccessFlags mods, int offset) { 545 int flags = (IS_FIELD | (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS )); 546 oop vmtarget = field_holder; 547 int vmindex = offset; // determines the field uniquely when combined with static bit 548 assert(vmindex != VM_INDEX_UNINITIALIZED, "bad alias on vmindex"); 549 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget); 550 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); 551 java_lang_invoke_MemberName::set_flags(mname_oop, flags); 552 java_lang_invoke_MemberName::set_clazz(mname_oop, Klass::cast(field_holder)->java_mirror()); 553 } 554 555 556 methodHandle MethodHandles::decode_MemberName(oop mname, KlassHandle& receiver_limit_result, int& decode_flags_result) { 557 methodHandle empty; 558 int flags = java_lang_invoke_MemberName::flags(mname); 559 if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) == 0) return empty; // not invocable 560 oop vmtarget = java_lang_invoke_MemberName::vmtarget(mname); 561 int vmindex = java_lang_invoke_MemberName::vmindex(mname); 562 if (vmindex == VM_INDEX_UNINITIALIZED) return empty; // not resolved 563 methodHandle m = decode_vmtarget(vmtarget, vmindex, NULL, receiver_limit_result, decode_flags_result); 564 oop clazz = java_lang_invoke_MemberName::clazz(mname); 565 if (clazz != NULL && java_lang_Class::is_instance(clazz)) { 566 klassOop klass = java_lang_Class::as_klassOop(clazz); 567 if (klass != NULL) receiver_limit_result = klass; 568 } 569 return m; 570 } 571 572 // convert the external string or reflective type to an internal signature 573 Symbol* MethodHandles::convert_to_signature(oop type_str, bool polymorphic, TRAPS) { 574 if (java_lang_invoke_MethodType::is_instance(type_str)) { 575 return java_lang_invoke_MethodType::as_signature(type_str, polymorphic, CHECK_NULL); 576 } else if (java_lang_Class::is_instance(type_str)) { 577 return java_lang_Class::as_signature(type_str, false, CHECK_NULL); 578 } else if (java_lang_String::is_instance(type_str)) { 579 if (polymorphic) { 580 return java_lang_String::as_symbol(type_str, CHECK_NULL); 581 } else { 582 return java_lang_String::as_symbol_or_null(type_str); 583 } 584 } else { 585 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL); 586 } 587 } 588 589 // An unresolved member name is a mere symbolic reference. 590 // Resolving it plants a vmtarget/vmindex in it, 591 // which refers dirctly to JVM internals. 592 void MethodHandles::resolve_MemberName(Handle mname, TRAPS) { 593 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 594 #ifdef ASSERT 595 // If this assert throws, renegotiate the sentinel value used by the Java code, 596 // so that it is distinct from any valid vtable index value, and any special 597 // values defined in methodOopDesc::VtableIndexFlag. 598 // The point of the slop is to give the Java code and the JVM some room 599 // to independently specify sentinel values. 600 const int sentinel_slop = 10; 601 const int sentinel_limit = methodOopDesc::highest_unused_vtable_index_value - sentinel_slop; 602 assert(VM_INDEX_UNINITIALIZED < sentinel_limit, "Java sentinel != JVM sentinels"); 603 #endif 604 if (java_lang_invoke_MemberName::vmindex(mname()) != VM_INDEX_UNINITIALIZED) 605 return; // already resolved 606 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname())); 607 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname())); 608 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname())); 609 int flags = java_lang_invoke_MemberName::flags(mname()); 610 611 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) { 612 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve"); 613 } 614 615 instanceKlassHandle defc; 616 { 617 klassOop defc_klassOop = java_lang_Class::as_klassOop(defc_oop()); 618 if (defc_klassOop == NULL) return; // a primitive; no resolution possible 619 if (!Klass::cast(defc_klassOop)->oop_is_instance()) { 620 if (!Klass::cast(defc_klassOop)->oop_is_array()) return; 621 defc_klassOop = SystemDictionary::Object_klass(); 622 } 623 defc = instanceKlassHandle(THREAD, defc_klassOop); 624 } 625 if (defc.is_null()) { 626 THROW_MSG(vmSymbols::java_lang_InternalError(), "primitive class"); 627 } 628 defc->link_class(CHECK); // possible safepoint 629 630 // convert the external string name to an internal symbol 631 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str()); 632 if (name == NULL) return; // no such name 633 634 Handle polymorphic_method_type; 635 bool polymorphic_signature = false; 636 if ((flags & ALL_KINDS) == IS_METHOD && 637 (defc() == SystemDictionary::MethodHandle_klass() && 638 methodOopDesc::is_method_handle_invoke_name(name))) { 639 polymorphic_signature = true; 640 } 641 642 // convert the external string or reflective type to an internal signature 643 TempNewSymbol type = convert_to_signature(type_str(), polymorphic_signature, CHECK); 644 if (java_lang_invoke_MethodType::is_instance(type_str()) && polymorphic_signature) { 645 polymorphic_method_type = type_str; // preserve exactly 646 } 647 if (type == NULL) return; // no such signature exists in the VM 648 649 // Time to do the lookup. 650 switch (flags & ALL_KINDS) { 651 case IS_METHOD: 652 { 653 CallInfo result; 654 { 655 EXCEPTION_MARK; 656 if ((flags & JVM_ACC_STATIC) != 0) { 657 LinkResolver::resolve_static_call(result, 658 defc, name, type, KlassHandle(), false, false, THREAD); 659 } else if (defc->is_interface()) { 660 LinkResolver::resolve_interface_call(result, Handle(), defc, 661 defc, name, type, KlassHandle(), false, false, THREAD); 662 } else { 663 LinkResolver::resolve_virtual_call(result, Handle(), defc, 664 defc, name, type, KlassHandle(), false, false, THREAD); 665 } 666 if (HAS_PENDING_EXCEPTION) { 667 CLEAR_PENDING_EXCEPTION; 668 break; // go to second chance 669 } 670 } 671 methodHandle m = result.resolved_method(); 672 oop vmtarget = NULL; 673 int vmindex = methodOopDesc::nonvirtual_vtable_index; 674 if (defc->is_interface()) { 675 vmindex = klassItable::compute_itable_index(m()); 676 assert(vmindex >= 0, ""); 677 } else if (result.has_vtable_index()) { 678 vmindex = result.vtable_index(); 679 assert(vmindex >= 0, ""); 680 } 681 assert(vmindex != VM_INDEX_UNINITIALIZED, ""); 682 if (vmindex < 0) { 683 assert(result.is_statically_bound(), ""); 684 vmtarget = m(); 685 } else { 686 vmtarget = result.resolved_klass()->as_klassOop(); 687 } 688 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS); 689 java_lang_invoke_MemberName::set_vmtarget(mname(), vmtarget); 690 java_lang_invoke_MemberName::set_vmindex(mname(), vmindex); 691 java_lang_invoke_MemberName::set_modifiers(mname(), mods); 692 DEBUG_ONLY(KlassHandle junk1; int junk2); 693 assert(decode_MemberName(mname(), junk1, junk2) == result.resolved_method(), 694 "properly stored for later decoding"); 695 return; 696 } 697 case IS_CONSTRUCTOR: 698 { 699 CallInfo result; 700 { 701 EXCEPTION_MARK; 702 if (name == vmSymbols::object_initializer_name()) { 703 LinkResolver::resolve_special_call(result, 704 defc, name, type, KlassHandle(), false, THREAD); 705 } else { 706 break; // will throw after end of switch 707 } 708 if (HAS_PENDING_EXCEPTION) { 709 CLEAR_PENDING_EXCEPTION; 710 return; 711 } 712 } 713 assert(result.is_statically_bound(), ""); 714 methodHandle m = result.resolved_method(); 715 oop vmtarget = m(); 716 int vmindex = methodOopDesc::nonvirtual_vtable_index; 717 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS); 718 java_lang_invoke_MemberName::set_vmtarget(mname(), vmtarget); 719 java_lang_invoke_MemberName::set_vmindex(mname(), vmindex); 720 java_lang_invoke_MemberName::set_modifiers(mname(), mods); 721 DEBUG_ONLY(KlassHandle junk1; int junk2); 722 assert(decode_MemberName(mname(), junk1, junk2) == result.resolved_method(), 723 "properly stored for later decoding"); 724 return; 725 } 726 case IS_FIELD: 727 { 728 // This is taken from LinkResolver::resolve_field, sans access checks. 729 fieldDescriptor fd; // find_field initializes fd if found 730 KlassHandle sel_klass(THREAD, instanceKlass::cast(defc())->find_field(name, type, &fd)); 731 // check if field exists; i.e., if a klass containing the field def has been selected 732 if (sel_klass.is_null()) return; 733 oop vmtarget = sel_klass->as_klassOop(); 734 int vmindex = fd.offset(); 735 int mods = (fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS); 736 if (vmindex == VM_INDEX_UNINITIALIZED) break; // should not happen 737 java_lang_invoke_MemberName::set_vmtarget(mname(), vmtarget); 738 java_lang_invoke_MemberName::set_vmindex(mname(), vmindex); 739 java_lang_invoke_MemberName::set_modifiers(mname(), mods); 740 return; 741 } 742 default: 743 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); 744 } 745 746 // Second chance. 747 if (polymorphic_method_type.not_null()) { 748 // Look on a non-null class loader. 749 Handle cur_class_loader; 750 const int nptypes = java_lang_invoke_MethodType::ptype_count(polymorphic_method_type()); 751 for (int i = 0; i <= nptypes; i++) { 752 oop type_mirror; 753 if (i < nptypes) type_mirror = java_lang_invoke_MethodType::ptype(polymorphic_method_type(), i); 754 else type_mirror = java_lang_invoke_MethodType::rtype(polymorphic_method_type()); 755 klassOop example_type = java_lang_Class::as_klassOop(type_mirror); 756 if (example_type == NULL) continue; 757 oop class_loader = Klass::cast(example_type)->class_loader(); 758 if (class_loader == NULL || class_loader == cur_class_loader()) continue; 759 cur_class_loader = Handle(THREAD, class_loader); 760 methodOop m = SystemDictionary::find_method_handle_invoke(name, 761 type, 762 KlassHandle(THREAD, example_type), 763 THREAD); 764 if (HAS_PENDING_EXCEPTION) { 765 CLEAR_PENDING_EXCEPTION; 766 m = NULL; 767 // try again with a different class loader... 768 } 769 if (m != NULL) { 770 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS); 771 java_lang_invoke_MemberName::set_vmtarget(mname(), m); 772 java_lang_invoke_MemberName::set_vmindex(mname(), m->vtable_index()); 773 java_lang_invoke_MemberName::set_modifiers(mname(), mods); 774 return; 775 } 776 } 777 } 778 } 779 780 // Conversely, a member name which is only initialized from JVM internals 781 // may have null defc, name, and type fields. 782 // Resolving it plants a vmtarget/vmindex in it, 783 // which refers directly to JVM internals. 784 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { 785 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 786 oop vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 787 int vmindex = java_lang_invoke_MemberName::vmindex(mname()); 788 if (vmtarget == NULL || vmindex == VM_INDEX_UNINITIALIZED) { 789 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); 790 } 791 792 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL); 793 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL); 794 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL); 795 int flags = java_lang_invoke_MemberName::flags(mname()); 796 797 if (suppress != 0) { 798 if (suppress & _suppress_defc) have_defc = true; 799 if (suppress & _suppress_name) have_name = true; 800 if (suppress & _suppress_type) have_type = true; 801 } 802 803 if (have_defc && have_name && have_type) return; // nothing needed 804 805 switch (flags & ALL_KINDS) { 806 case IS_METHOD: 807 case IS_CONSTRUCTOR: 808 { 809 KlassHandle receiver_limit; int decode_flags = 0; 810 methodHandle m = decode_vmtarget(vmtarget, vmindex, NULL, receiver_limit, decode_flags); 811 if (m.is_null()) break; 812 if (!have_defc) { 813 klassOop defc = m->method_holder(); 814 if (receiver_limit.not_null() && receiver_limit() != defc 815 && Klass::cast(receiver_limit())->is_subtype_of(defc)) 816 defc = receiver_limit(); 817 java_lang_invoke_MemberName::set_clazz(mname(), Klass::cast(defc)->java_mirror()); 818 } 819 if (!have_name) { 820 //not java_lang_String::create_from_symbol; let's intern member names 821 Handle name = StringTable::intern(m->name(), CHECK); 822 java_lang_invoke_MemberName::set_name(mname(), name()); 823 } 824 if (!have_type) { 825 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); 826 java_lang_invoke_MemberName::set_type(mname(), type()); 827 } 828 return; 829 } 830 case IS_FIELD: 831 { 832 // This is taken from LinkResolver::resolve_field, sans access checks. 833 if (!vmtarget->is_klass()) break; 834 if (!Klass::cast((klassOop) vmtarget)->oop_is_instance()) break; 835 instanceKlassHandle defc(THREAD, (klassOop) vmtarget); 836 bool is_static = ((flags & JVM_ACC_STATIC) != 0); 837 fieldDescriptor fd; // find_field initializes fd if found 838 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) 839 break; // cannot expand 840 if (!have_defc) { 841 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 842 } 843 if (!have_name) { 844 //not java_lang_String::create_from_symbol; let's intern member names 845 Handle name = StringTable::intern(fd.name(), CHECK); 846 java_lang_invoke_MemberName::set_name(mname(), name()); 847 } 848 if (!have_type) { 849 Handle type = java_lang_String::create_from_symbol(fd.signature(), CHECK); 850 java_lang_invoke_MemberName::set_type(mname(), type()); 851 } 852 return; 853 } 854 } 855 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); 856 } 857 858 int MethodHandles::find_MemberNames(klassOop k, 859 Symbol* name, Symbol* sig, 860 int mflags, klassOop caller, 861 int skip, objArrayOop results) { 862 DEBUG_ONLY(No_Safepoint_Verifier nsv); 863 // this code contains no safepoints! 864 865 // %%% take caller into account! 866 867 if (k == NULL || !Klass::cast(k)->oop_is_instance()) return -1; 868 869 int rfill = 0, rlimit = results->length(), rskip = skip; 870 // overflow measurement: 871 int overflow = 0, overflow_limit = MAX2(1000, rlimit); 872 873 int match_flags = mflags; 874 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); 875 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); 876 bool local_only = !(search_superc | search_intfc); 877 bool classes_only = false; 878 879 if (name != NULL) { 880 if (name->utf8_length() == 0) return 0; // a match is not possible 881 } 882 if (sig != NULL) { 883 if (sig->utf8_length() == 0) return 0; // a match is not possible 884 if (sig->byte_at(0) == '(') 885 match_flags &= ~(IS_FIELD | IS_TYPE); 886 else 887 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); 888 } 889 890 if ((match_flags & IS_TYPE) != 0) { 891 // NYI, and Core Reflection works quite well for this query 892 } 893 894 if ((match_flags & IS_FIELD) != 0) { 895 for (FieldStream st(k, local_only, !search_intfc); !st.eos(); st.next()) { 896 if (name != NULL && st.name() != name) 897 continue; 898 if (sig != NULL && st.signature() != sig) 899 continue; 900 // passed the filters 901 if (rskip > 0) { 902 --rskip; 903 } else if (rfill < rlimit) { 904 oop result = results->obj_at(rfill++); 905 if (!java_lang_invoke_MemberName::is_instance(result)) 906 return -99; // caller bug! 907 MethodHandles::init_MemberName(result, st.klass()->as_klassOop(), st.access_flags(), st.offset()); 908 } else if (++overflow >= overflow_limit) { 909 match_flags = 0; break; // got tired of looking at overflow 910 } 911 } 912 } 913 914 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { 915 // watch out for these guys: 916 Symbol* init_name = vmSymbols::object_initializer_name(); 917 Symbol* clinit_name = vmSymbols::class_initializer_name(); 918 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> 919 bool negate_name_test = false; 920 // fix name so that it captures the intention of IS_CONSTRUCTOR 921 if (!(match_flags & IS_METHOD)) { 922 // constructors only 923 if (name == NULL) { 924 name = init_name; 925 } else if (name != init_name) { 926 return 0; // no constructors of this method name 927 } 928 } else if (!(match_flags & IS_CONSTRUCTOR)) { 929 // methods only 930 if (name == NULL) { 931 name = init_name; 932 negate_name_test = true; // if we see the name, we *omit* the entry 933 } else if (name == init_name) { 934 return 0; // no methods of this constructor name 935 } 936 } else { 937 // caller will accept either sort; no need to adjust name 938 } 939 for (MethodStream st(k, local_only, !search_intfc); !st.eos(); st.next()) { 940 methodOop m = st.method(); 941 Symbol* m_name = m->name(); 942 if (m_name == clinit_name) 943 continue; 944 if (name != NULL && ((m_name != name) ^ negate_name_test)) 945 continue; 946 if (sig != NULL && m->signature() != sig) 947 continue; 948 // passed the filters 949 if (rskip > 0) { 950 --rskip; 951 } else if (rfill < rlimit) { 952 oop result = results->obj_at(rfill++); 953 if (!java_lang_invoke_MemberName::is_instance(result)) 954 return -99; // caller bug! 955 MethodHandles::init_MemberName(result, m, true); 956 } else if (++overflow >= overflow_limit) { 957 match_flags = 0; break; // got tired of looking at overflow 958 } 959 } 960 } 961 962 // return number of elements we at leasted wanted to initialize 963 return rfill + overflow; 964 } 965 966 967 // Decode this java.lang.Class object into an instanceKlass, if possible. 968 // Throw IAE if not 969 instanceKlassHandle MethodHandles::resolve_instance_klass(oop java_mirror_oop, TRAPS) { 970 instanceKlassHandle empty; 971 klassOop caller = NULL; 972 if (java_lang_Class::is_instance(java_mirror_oop)) { 973 caller = java_lang_Class::as_klassOop(java_mirror_oop); 974 } 975 if (caller == NULL || !Klass::cast(caller)->oop_is_instance()) { 976 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not a class", empty); 977 } 978 return instanceKlassHandle(THREAD, caller); 979 } 980 981 982 983 // Decode the vmtarget field of a method handle. 984 // Sanitize out methodOops, klassOops, and any other non-Java data. 985 // This is for debugging and reflection. 986 oop MethodHandles::encode_target(Handle mh, int format, TRAPS) { 987 assert(java_lang_invoke_MethodHandle::is_instance(mh()), "must be a MH"); 988 if (format == ETF_HANDLE_OR_METHOD_NAME) { 989 oop target = java_lang_invoke_MethodHandle::vmtarget(mh()); 990 if (target == NULL) { 991 return NULL; // unformed MH 992 } 993 klassOop tklass = target->klass(); 994 if (Klass::cast(tklass)->is_subclass_of(SystemDictionary::Object_klass())) { 995 return target; // target is another MH (or something else?) 996 } 997 } 998 if (format == ETF_DIRECT_HANDLE) { 999 oop target = mh(); 1000 for (;;) { 1001 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) { 1002 return target; 1003 } 1004 if (!java_lang_invoke_MethodHandle::is_instance(target)){ 1005 return NULL; // unformed MH 1006 } 1007 target = java_lang_invoke_MethodHandle::vmtarget(target); 1008 } 1009 } 1010 // cases of metadata in MH.vmtarget: 1011 // - AMH can have methodOop for static invoke with bound receiver 1012 // - DMH can have methodOop for static invoke (on variable receiver) 1013 // - DMH can have klassOop for dispatched (non-static) invoke 1014 KlassHandle receiver_limit; int decode_flags = 0; 1015 methodHandle m = decode_MethodHandle(mh(), receiver_limit, decode_flags); 1016 if (m.is_null()) return NULL; 1017 switch (format) { 1018 case ETF_REFLECT_METHOD: 1019 // same as jni_ToReflectedMethod: 1020 if (m->is_initializer()) { 1021 return Reflection::new_constructor(m, THREAD); 1022 } else { 1023 return Reflection::new_method(m, UseNewReflection, false, THREAD); 1024 } 1025 1026 case ETF_HANDLE_OR_METHOD_NAME: // method, not handle 1027 case ETF_METHOD_NAME: 1028 { 1029 if (SystemDictionary::MemberName_klass() == NULL) break; 1030 instanceKlassHandle mname_klass(THREAD, SystemDictionary::MemberName_klass()); 1031 mname_klass->initialize(CHECK_NULL); 1032 Handle mname = mname_klass->allocate_instance_handle(CHECK_NULL); // possible safepoint 1033 java_lang_invoke_MemberName::set_vmindex(mname(), VM_INDEX_UNINITIALIZED); 1034 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0); 1035 init_MemberName(mname(), m(), do_dispatch); 1036 expand_MemberName(mname, 0, CHECK_NULL); 1037 return mname(); 1038 } 1039 } 1040 1041 // Unknown format code. 1042 char msg[50]; 1043 jio_snprintf(msg, sizeof(msg), "unknown getTarget format=%d", format); 1044 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), msg); 1045 } 1046 1047 static const char* always_null_names[] = { 1048 "java/lang/Void", 1049 "java/lang/Null", 1050 //"java/lang/Nothing", 1051 "sun/dyn/empty/Empty", 1052 "sun/invoke/empty/Empty", 1053 NULL 1054 }; 1055 1056 static bool is_always_null_type(klassOop klass) { 1057 if (klass == NULL) return false; // safety 1058 if (!Klass::cast(klass)->oop_is_instance()) return false; 1059 instanceKlass* ik = instanceKlass::cast(klass); 1060 // Must be on the boot class path: 1061 if (ik->class_loader() != NULL) return false; 1062 // Check the name. 1063 Symbol* name = ik->name(); 1064 for (int i = 0; ; i++) { 1065 const char* test_name = always_null_names[i]; 1066 if (test_name == NULL) break; 1067 if (name->equals(test_name)) 1068 return true; 1069 } 1070 return false; 1071 } 1072 1073 bool MethodHandles::class_cast_needed(klassOop src, klassOop dst) { 1074 if (dst == NULL) return true; 1075 if (src == NULL) return (dst != SystemDictionary::Object_klass()); 1076 if (src == dst || dst == SystemDictionary::Object_klass()) 1077 return false; // quickest checks 1078 Klass* srck = Klass::cast(src); 1079 Klass* dstk = Klass::cast(dst); 1080 if (dstk->is_interface()) { 1081 // interface receivers can safely be viewed as untyped, 1082 // because interface calls always include a dynamic check 1083 //dstk = Klass::cast(SystemDictionary::Object_klass()); 1084 return false; 1085 } 1086 if (srck->is_interface()) { 1087 // interface arguments must be viewed as untyped 1088 //srck = Klass::cast(SystemDictionary::Object_klass()); 1089 return true; 1090 } 1091 if (is_always_null_type(src)) { 1092 // some source types are known to be never instantiated; 1093 // they represent references which are always null 1094 // such null references never fail to convert safely 1095 return false; 1096 } 1097 return !srck->is_subclass_of(dstk->as_klassOop()); 1098 } 1099 1100 static oop object_java_mirror() { 1101 return Klass::cast(SystemDictionary::Object_klass())->java_mirror(); 1102 } 1103 1104 bool MethodHandles::is_float_fixed_reinterpretation_cast(BasicType src, BasicType dst) { 1105 if (src == T_FLOAT) return dst == T_INT; 1106 if (src == T_INT) return dst == T_FLOAT; 1107 if (src == T_DOUBLE) return dst == T_LONG; 1108 if (src == T_LONG) return dst == T_DOUBLE; 1109 return false; 1110 } 1111 1112 bool MethodHandles::same_basic_type_for_arguments(BasicType src, 1113 BasicType dst, 1114 bool raw, 1115 bool for_return) { 1116 if (for_return) { 1117 // return values can always be forgotten: 1118 if (dst == T_VOID) return true; 1119 if (src == T_VOID) return raw && (dst == T_INT); 1120 // We allow caller to receive a garbage int, which is harmless. 1121 // This trick is pulled by trusted code (see VerifyType.canPassRaw). 1122 } 1123 assert(src != T_VOID && dst != T_VOID, "should not be here"); 1124 if (src == dst) return true; 1125 if (type2size[src] != type2size[dst]) return false; 1126 if (src == T_OBJECT || dst == T_OBJECT) return false; 1127 if (raw) return true; // bitwise reinterpretation; caller guarantees safety 1128 // allow reinterpretation casts for integral widening 1129 if (is_subword_type(src)) { // subwords can fit in int or other subwords 1130 if (dst == T_INT) // any subword fits in an int 1131 return true; 1132 if (src == T_BOOLEAN) // boolean fits in any subword 1133 return is_subword_type(dst); 1134 if (src == T_BYTE && dst == T_SHORT) 1135 return true; // remaining case: byte fits in short 1136 } 1137 // allow float/fixed reinterpretation casts 1138 if (is_float_fixed_reinterpretation_cast(src, dst)) 1139 return true; 1140 return false; 1141 } 1142 1143 const char* MethodHandles::check_method_receiver(methodOop m, 1144 klassOop passed_recv_type) { 1145 assert(!m->is_static(), "caller resp."); 1146 if (passed_recv_type == NULL) 1147 return "receiver type is primitive"; 1148 if (class_cast_needed(passed_recv_type, m->method_holder())) { 1149 Klass* formal = Klass::cast(m->method_holder()); 1150 return SharedRuntime::generate_class_cast_message("receiver type", 1151 formal->external_name()); 1152 } 1153 return NULL; // checks passed 1154 } 1155 1156 // Verify that m's signature can be called type-safely by a method handle 1157 // of the given method type 'mtype'. 1158 // It takes a TRAPS argument because it must perform symbol lookups. 1159 void MethodHandles::verify_method_signature(methodHandle m, 1160 Handle mtype, 1161 int first_ptype_pos, 1162 KlassHandle insert_ptype, 1163 TRAPS) { 1164 Handle mhi_type; 1165 if (m->is_method_handle_invoke()) { 1166 // use this more exact typing instead of the symbolic signature: 1167 mhi_type = Handle(THREAD, m->method_handle_type()); 1168 } 1169 objArrayHandle ptypes(THREAD, java_lang_invoke_MethodType::ptypes(mtype())); 1170 int pnum = first_ptype_pos; 1171 int pmax = ptypes->length(); 1172 int anum = 0; // method argument 1173 const char* err = NULL; 1174 ResourceMark rm(THREAD); 1175 for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) { 1176 oop ptype_oop = NULL; 1177 if (ss.at_return_type()) { 1178 if (pnum != pmax) 1179 { err = "too many arguments"; break; } 1180 ptype_oop = java_lang_invoke_MethodType::rtype(mtype()); 1181 } else { 1182 if (pnum >= pmax) 1183 { err = "not enough arguments"; break; } 1184 if (pnum >= 0) 1185 ptype_oop = ptypes->obj_at(pnum); 1186 else if (insert_ptype.is_null()) 1187 ptype_oop = NULL; 1188 else 1189 ptype_oop = insert_ptype->java_mirror(); 1190 pnum += 1; 1191 anum += 1; 1192 } 1193 KlassHandle pklass; 1194 BasicType ptype = T_OBJECT; 1195 bool have_ptype = false; 1196 // missing ptype_oop does not match any non-reference; use Object to report the error 1197 pklass = SystemDictionaryHandles::Object_klass(); 1198 if (ptype_oop != NULL) { 1199 have_ptype = true; 1200 klassOop pklass_oop = NULL; 1201 ptype = java_lang_Class::as_BasicType(ptype_oop, &pklass_oop); 1202 pklass = KlassHandle(THREAD, pklass_oop); 1203 } 1204 ptype_oop = NULL; //done with this 1205 KlassHandle aklass; 1206 BasicType atype = ss.type(); 1207 if (atype == T_ARRAY) atype = T_OBJECT; // fold all refs to T_OBJECT 1208 if (atype == T_OBJECT) { 1209 if (!have_ptype) { 1210 // null matches any reference 1211 continue; 1212 } 1213 if (mhi_type.is_null()) { 1214 // If we fail to resolve types at this point, we will usually throw an error. 1215 TempNewSymbol name = ss.as_symbol_or_null(); 1216 if (name != NULL) { 1217 instanceKlass* mk = instanceKlass::cast(m->method_holder()); 1218 Handle loader(THREAD, mk->class_loader()); 1219 Handle domain(THREAD, mk->protection_domain()); 1220 klassOop aklass_oop = SystemDictionary::resolve_or_null(name, loader, domain, CHECK); 1221 if (aklass_oop != NULL) 1222 aklass = KlassHandle(THREAD, aklass_oop); 1223 } 1224 } else { 1225 // for method handle invokers we don't look at the name in the signature 1226 oop atype_oop; 1227 if (ss.at_return_type()) 1228 atype_oop = java_lang_invoke_MethodType::rtype(mhi_type()); 1229 else 1230 atype_oop = java_lang_invoke_MethodType::ptype(mhi_type(), anum-1); 1231 klassOop aklass_oop = NULL; 1232 atype = java_lang_Class::as_BasicType(atype_oop, &aklass_oop); 1233 aklass = KlassHandle(THREAD, aklass_oop); 1234 } 1235 } 1236 if (!ss.at_return_type()) { 1237 err = check_argument_type_change(ptype, pklass(), atype, aklass(), anum); 1238 } else { 1239 err = check_return_type_change(atype, aklass(), ptype, pklass()); // note reversal! 1240 } 1241 if (err != NULL) break; 1242 } 1243 1244 if (err != NULL) { 1245 #ifndef PRODUCT 1246 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1247 tty->print("*** verify_method_signature failed: "); 1248 java_lang_invoke_MethodType::print_signature(mtype(), tty); 1249 tty->cr(); 1250 tty->print_cr(" first_ptype_pos = %d, insert_ptype = "UINTX_FORMAT, first_ptype_pos, insert_ptype()); 1251 tty->print(" Failing method: "); 1252 m->print(); 1253 } 1254 #endif //PRODUCT 1255 THROW_MSG(vmSymbols::java_lang_InternalError(), err); 1256 } 1257 } 1258 1259 // Main routine for verifying the MethodHandle.type of a proposed 1260 // direct or bound-direct method handle. 1261 void MethodHandles::verify_method_type(methodHandle m, 1262 Handle mtype, 1263 bool has_bound_recv, 1264 KlassHandle bound_recv_type, 1265 TRAPS) { 1266 bool m_needs_receiver = !m->is_static(); 1267 1268 const char* err = NULL; 1269 1270 int first_ptype_pos = m_needs_receiver ? 1 : 0; 1271 if (has_bound_recv) { 1272 first_ptype_pos -= 1; // ptypes do not include the bound argument; start earlier in them 1273 if (m_needs_receiver && bound_recv_type.is_null()) 1274 { err = "bound receiver is not an object"; goto die; } 1275 } 1276 1277 if (m_needs_receiver && err == NULL) { 1278 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(mtype()); 1279 if (ptypes->length() < first_ptype_pos) 1280 { err = "receiver argument is missing"; goto die; } 1281 if (has_bound_recv) 1282 err = check_method_receiver(m(), bound_recv_type->as_klassOop()); 1283 else 1284 err = check_method_receiver(m(), java_lang_Class::as_klassOop(ptypes->obj_at(first_ptype_pos-1))); 1285 if (err != NULL) goto die; 1286 } 1287 1288 // Check the other arguments for mistypes. 1289 verify_method_signature(m, mtype, first_ptype_pos, bound_recv_type, CHECK); 1290 return; 1291 1292 die: 1293 THROW_MSG(vmSymbols::java_lang_InternalError(), err); 1294 } 1295 1296 void MethodHandles::verify_vmslots(Handle mh, TRAPS) { 1297 // Verify vmslots. 1298 int check_slots = argument_slot_count(java_lang_invoke_MethodHandle::type(mh())); 1299 if (java_lang_invoke_MethodHandle::vmslots(mh()) != check_slots) { 1300 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH"); 1301 } 1302 } 1303 1304 void MethodHandles::verify_vmargslot(Handle mh, int argnum, int argslot, TRAPS) { 1305 // Verify that argslot points at the given argnum. 1306 int check_slot = argument_slot(java_lang_invoke_MethodHandle::type(mh()), argnum); 1307 if (argslot != check_slot || argslot < 0) { 1308 const char* fmt = "for argnum of %d, vmargslot is %d, should be %d"; 1309 size_t msglen = strlen(fmt) + 3*11 + 1; 1310 char* msg = NEW_RESOURCE_ARRAY(char, msglen); 1311 jio_snprintf(msg, msglen, fmt, argnum, argslot, check_slot); 1312 THROW_MSG(vmSymbols::java_lang_InternalError(), msg); 1313 } 1314 } 1315 1316 // Verify the correspondence between two method types. 1317 // Apart from the advertised changes, caller method type X must 1318 // be able to invoke the callee method Y type with no violations 1319 // of type integrity. 1320 // Return NULL if all is well, else a short error message. 1321 const char* MethodHandles::check_method_type_change(oop src_mtype, int src_beg, int src_end, 1322 int insert_argnum, oop insert_type, 1323 int change_argnum, oop change_type, 1324 int delete_argnum, 1325 oop dst_mtype, int dst_beg, int dst_end, 1326 bool raw) { 1327 objArrayOop src_ptypes = java_lang_invoke_MethodType::ptypes(src_mtype); 1328 objArrayOop dst_ptypes = java_lang_invoke_MethodType::ptypes(dst_mtype); 1329 1330 int src_max = src_ptypes->length(); 1331 int dst_max = dst_ptypes->length(); 1332 1333 if (src_end == -1) src_end = src_max; 1334 if (dst_end == -1) dst_end = dst_max; 1335 1336 assert(0 <= src_beg && src_beg <= src_end && src_end <= src_max, "oob"); 1337 assert(0 <= dst_beg && dst_beg <= dst_end && dst_end <= dst_max, "oob"); 1338 1339 // pending actions; set to -1 when done: 1340 int ins_idx = insert_argnum, chg_idx = change_argnum, del_idx = delete_argnum; 1341 1342 const char* err = NULL; 1343 1344 // Walk along each array of parameter types, including a virtual 1345 // NULL end marker at the end of each. 1346 for (int src_idx = src_beg, dst_idx = dst_beg; 1347 (src_idx <= src_end && dst_idx <= dst_end); 1348 src_idx++, dst_idx++) { 1349 oop src_type = (src_idx == src_end) ? oop(NULL) : src_ptypes->obj_at(src_idx); 1350 oop dst_type = (dst_idx == dst_end) ? oop(NULL) : dst_ptypes->obj_at(dst_idx); 1351 bool fix_null_src_type = false; 1352 1353 // Perform requested edits. 1354 if (ins_idx == src_idx) { 1355 // note that the inserted guy is never affected by a change or deletion 1356 ins_idx = -1; 1357 src_type = insert_type; 1358 fix_null_src_type = true; 1359 --src_idx; // back up to process src type on next loop 1360 src_idx = src_end; 1361 } else { 1362 // note that the changed guy can be immediately deleted 1363 if (chg_idx == src_idx) { 1364 chg_idx = -1; 1365 assert(src_idx < src_end, "oob"); 1366 src_type = change_type; 1367 fix_null_src_type = true; 1368 } 1369 if (del_idx == src_idx) { 1370 del_idx = -1; 1371 assert(src_idx < src_end, "oob"); 1372 --dst_idx; 1373 continue; // rerun loop after skipping this position 1374 } 1375 } 1376 1377 if (src_type == NULL && fix_null_src_type) 1378 // explicit null in this case matches any dest reference 1379 src_type = (java_lang_Class::is_primitive(dst_type) ? object_java_mirror() : dst_type); 1380 1381 // Compare the two argument types. 1382 if (src_type != dst_type) { 1383 if (src_type == NULL) return "not enough arguments"; 1384 if (dst_type == NULL) return "too many arguments"; 1385 err = check_argument_type_change(src_type, dst_type, dst_idx, raw); 1386 if (err != NULL) return err; 1387 } 1388 } 1389 1390 // Now compare return types also. 1391 oop src_rtype = java_lang_invoke_MethodType::rtype(src_mtype); 1392 oop dst_rtype = java_lang_invoke_MethodType::rtype(dst_mtype); 1393 if (src_rtype != dst_rtype) { 1394 err = check_return_type_change(dst_rtype, src_rtype, raw); // note reversal! 1395 if (err != NULL) return err; 1396 } 1397 1398 assert(err == NULL, ""); 1399 return NULL; // all is well 1400 } 1401 1402 1403 const char* MethodHandles::check_argument_type_change(BasicType src_type, 1404 klassOop src_klass, 1405 BasicType dst_type, 1406 klassOop dst_klass, 1407 int argnum, 1408 bool raw) { 1409 const char* err = NULL; 1410 const bool for_return = (argnum < 0); 1411 1412 // just in case: 1413 if (src_type == T_ARRAY) src_type = T_OBJECT; 1414 if (dst_type == T_ARRAY) dst_type = T_OBJECT; 1415 1416 // Produce some nice messages if VerifyMethodHandles is turned on: 1417 if (!same_basic_type_for_arguments(src_type, dst_type, raw, for_return)) { 1418 if (src_type == T_OBJECT) { 1419 if (raw && is_java_primitive(dst_type)) 1420 return NULL; // ref-to-prim discards ref and returns zero 1421 err = (!for_return 1422 ? "type mismatch: passing a %s for method argument #%d, which expects primitive %s" 1423 : "type mismatch: returning a %s, but caller expects primitive %s"); 1424 } else if (dst_type == T_OBJECT) { 1425 err = (!for_return 1426 ? "type mismatch: passing a primitive %s for method argument #%d, which expects %s" 1427 : "type mismatch: returning a primitive %s, but caller expects %s"); 1428 } else { 1429 err = (!for_return 1430 ? "type mismatch: passing a %s for method argument #%d, which expects %s" 1431 : "type mismatch: returning a %s, but caller expects %s"); 1432 } 1433 } else if (src_type == T_OBJECT && dst_type == T_OBJECT && 1434 class_cast_needed(src_klass, dst_klass)) { 1435 if (!class_cast_needed(dst_klass, src_klass)) { 1436 if (raw) 1437 return NULL; // reverse cast is OK; the MH target is trusted to enforce it 1438 err = (!for_return 1439 ? "cast required: passing a %s for method argument #%d, which expects %s" 1440 : "cast required: returning a %s, but caller expects %s"); 1441 } else { 1442 err = (!for_return 1443 ? "reference mismatch: passing a %s for method argument #%d, which expects %s" 1444 : "reference mismatch: returning a %s, but caller expects %s"); 1445 } 1446 } else { 1447 // passed the obstacle course 1448 return NULL; 1449 } 1450 1451 // format, format, format 1452 const char* src_name = type2name(src_type); 1453 const char* dst_name = type2name(dst_type); 1454 if (src_name == NULL) src_name = "unknown type"; 1455 if (dst_name == NULL) dst_name = "unknown type"; 1456 if (src_type == T_OBJECT) 1457 src_name = (src_klass != NULL) ? Klass::cast(src_klass)->external_name() : "an unresolved class"; 1458 if (dst_type == T_OBJECT) 1459 dst_name = (dst_klass != NULL) ? Klass::cast(dst_klass)->external_name() : "an unresolved class"; 1460 1461 size_t msglen = strlen(err) + strlen(src_name) + strlen(dst_name) + (argnum < 10 ? 1 : 11); 1462 char* msg = NEW_RESOURCE_ARRAY(char, msglen + 1); 1463 if (!for_return) { 1464 assert(strstr(err, "%d") != NULL, ""); 1465 jio_snprintf(msg, msglen, err, src_name, argnum, dst_name); 1466 } else { 1467 assert(strstr(err, "%d") == NULL, ""); 1468 jio_snprintf(msg, msglen, err, src_name, dst_name); 1469 } 1470 return msg; 1471 } 1472 1473 // Compute the depth within the stack of the given argument, i.e., 1474 // the combined size of arguments to the right of the given argument. 1475 // For the last argument (ptypes.length-1) this will be zero. 1476 // For the first argument (0) this will be the size of all 1477 // arguments but that one. For the special number -1, this 1478 // will be the size of all arguments, including the first. 1479 // If the argument is neither -1 nor a valid argument index, 1480 // then return a negative number. Otherwise, the result 1481 // is in the range [0..vmslots] inclusive. 1482 int MethodHandles::argument_slot(oop method_type, int arg) { 1483 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(method_type); 1484 int argslot = 0; 1485 int len = ptypes->length(); 1486 if (arg < -1 || arg >= len) return -99; 1487 for (int i = len-1; i > arg; i--) { 1488 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i)); 1489 argslot += type2size[bt]; 1490 } 1491 assert(argument_slot_to_argnum(method_type, argslot) == arg, "inverse works"); 1492 return argslot; 1493 } 1494 1495 // Given a slot number, return the argument number. 1496 int MethodHandles::argument_slot_to_argnum(oop method_type, int query_argslot) { 1497 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(method_type); 1498 int argslot = 0; 1499 int len = ptypes->length(); 1500 for (int i = len-1; i >= 0; i--) { 1501 if (query_argslot == argslot) return i; 1502 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i)); 1503 argslot += type2size[bt]; 1504 } 1505 // return pseudo-arg deepest in stack: 1506 if (query_argslot == argslot) return -1; 1507 return -99; // oob slot, or splitting a double-slot arg 1508 } 1509 1510 methodHandle MethodHandles::dispatch_decoded_method(methodHandle m, 1511 KlassHandle receiver_limit, 1512 int decode_flags, 1513 KlassHandle receiver_klass, 1514 TRAPS) { 1515 assert((decode_flags & ~_DMF_DIRECT_MASK) == 0, "must be direct method reference"); 1516 assert((decode_flags & _dmf_has_receiver) != 0, "must have a receiver or first reference argument"); 1517 1518 if (!m->is_static() && 1519 (receiver_klass.is_null() || !receiver_klass->is_subtype_of(m->method_holder()))) 1520 // given type does not match class of method, or receiver is null! 1521 // caller should have checked this, but let's be extra careful... 1522 return methodHandle(); 1523 1524 if (receiver_limit.not_null() && 1525 (receiver_klass.not_null() && !receiver_klass->is_subtype_of(receiver_limit()))) 1526 // given type is not limited to the receiver type 1527 // note that a null receiver can match any reference value, for a static method 1528 return methodHandle(); 1529 1530 if (!(decode_flags & MethodHandles::_dmf_does_dispatch)) { 1531 // pre-dispatched or static method (null receiver is OK for static) 1532 return m; 1533 1534 } else if (receiver_klass.is_null()) { 1535 // null receiver value; cannot dispatch 1536 return methodHandle(); 1537 1538 } else if (!(decode_flags & MethodHandles::_dmf_from_interface)) { 1539 // perform virtual dispatch 1540 int vtable_index = m->vtable_index(); 1541 guarantee(vtable_index >= 0, "valid vtable index"); 1542 1543 // receiver_klass might be an arrayKlassOop but all vtables start at 1544 // the same place. The cast is to avoid virtual call and assertion. 1545 // See also LinkResolver::runtime_resolve_virtual_method. 1546 instanceKlass* inst = (instanceKlass*)Klass::cast(receiver_klass()); 1547 DEBUG_ONLY(inst->verify_vtable_index(vtable_index)); 1548 methodOop m_oop = inst->method_at_vtable(vtable_index); 1549 return methodHandle(THREAD, m_oop); 1550 1551 } else { 1552 // perform interface dispatch 1553 int itable_index = klassItable::compute_itable_index(m()); 1554 guarantee(itable_index >= 0, "valid itable index"); 1555 instanceKlass* inst = instanceKlass::cast(receiver_klass()); 1556 methodOop m_oop = inst->method_at_itable(m->method_holder(), itable_index, THREAD); 1557 return methodHandle(THREAD, m_oop); 1558 } 1559 } 1560 1561 void MethodHandles::verify_DirectMethodHandle(Handle mh, methodHandle m, TRAPS) { 1562 // Verify type. 1563 Handle mtype(THREAD, java_lang_invoke_MethodHandle::type(mh())); 1564 verify_method_type(m, mtype, false, KlassHandle(), CHECK); 1565 1566 // Verify vmslots. 1567 if (java_lang_invoke_MethodHandle::vmslots(mh()) != m->size_of_parameters()) { 1568 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in DMH"); 1569 } 1570 } 1571 1572 void MethodHandles::init_DirectMethodHandle(Handle mh, methodHandle m, bool do_dispatch, TRAPS) { 1573 // Check arguments. 1574 if (mh.is_null() || m.is_null() || 1575 (!do_dispatch && m->is_abstract())) { 1576 THROW(vmSymbols::java_lang_InternalError()); 1577 } 1578 1579 java_lang_invoke_MethodHandle::init_vmslots(mh()); 1580 1581 if (VerifyMethodHandles) { 1582 // The privileged code which invokes this routine should not make 1583 // a mistake about types, but it's better to verify. 1584 verify_DirectMethodHandle(mh, m, CHECK); 1585 } 1586 1587 // Finally, after safety checks are done, link to the target method. 1588 // We will follow the same path as the latter part of 1589 // InterpreterRuntime::resolve_invoke(), which first finds the method 1590 // and then decides how to populate the constant pool cache entry 1591 // that links the interpreter calls to the method. We need the same 1592 // bits, and will use the same calling sequence code. 1593 1594 int vmindex = methodOopDesc::garbage_vtable_index; 1595 Handle vmtarget; 1596 1597 instanceKlass::cast(m->method_holder())->link_class(CHECK); 1598 1599 MethodHandleEntry* me = NULL; 1600 if (do_dispatch && Klass::cast(m->method_holder())->is_interface()) { 1601 // We are simulating an invokeinterface instruction. 1602 // (We might also be simulating an invokevirtual on a miranda method, 1603 // but it is safe to treat it as an invokeinterface.) 1604 assert(!m->can_be_statically_bound(), "no final methods on interfaces"); 1605 vmindex = klassItable::compute_itable_index(m()); 1606 assert(vmindex >= 0, "(>=0) == do_dispatch"); 1607 // Set up same bits as ConstantPoolCacheEntry::set_interface_call(). 1608 vmtarget = m->method_holder(); // the interface 1609 me = MethodHandles::entry(MethodHandles::_invokeinterface_mh); 1610 } else if (!do_dispatch || m->can_be_statically_bound()) { 1611 // We are simulating an invokestatic or invokespecial instruction. 1612 // Set up the method pointer, just like ConstantPoolCacheEntry::set_method(). 1613 vmtarget = m; 1614 // this does not help dispatch, but it will make it possible to parse this MH: 1615 vmindex = methodOopDesc::nonvirtual_vtable_index; 1616 assert(vmindex < 0, "(>=0) == do_dispatch"); 1617 if (!m->is_static()) { 1618 me = MethodHandles::entry(MethodHandles::_invokespecial_mh); 1619 } else { 1620 me = MethodHandles::entry(MethodHandles::_invokestatic_mh); 1621 // Part of the semantics of a static call is an initialization barrier. 1622 // For a DMH, it is done now, when the handle is created. 1623 Klass* k = Klass::cast(m->method_holder()); 1624 if (k->should_be_initialized()) { 1625 k->initialize(CHECK); // possible safepoint 1626 } 1627 } 1628 } else { 1629 // We are simulating an invokevirtual instruction. 1630 // Set up the vtable index, just like ConstantPoolCacheEntry::set_method(). 1631 // The key logic is LinkResolver::runtime_resolve_virtual_method. 1632 vmindex = m->vtable_index(); 1633 vmtarget = m->method_holder(); 1634 me = MethodHandles::entry(MethodHandles::_invokevirtual_mh); 1635 } 1636 1637 if (me == NULL) { THROW(vmSymbols::java_lang_InternalError()); } 1638 1639 java_lang_invoke_DirectMethodHandle::set_vmtarget(mh(), vmtarget()); 1640 java_lang_invoke_DirectMethodHandle::set_vmindex( mh(), vmindex); 1641 DEBUG_ONLY(KlassHandle rlimit; int flags); 1642 assert(MethodHandles::decode_method(mh(), rlimit, flags) == m, 1643 "properly stored for later decoding"); 1644 DEBUG_ONLY(bool actual_do_dispatch = ((flags & _dmf_does_dispatch) != 0)); 1645 assert(!(actual_do_dispatch && !do_dispatch), 1646 "do not perform dispatch if !do_dispatch specified"); 1647 assert(actual_do_dispatch == (vmindex >= 0), "proper later decoding of do_dispatch"); 1648 assert(decode_MethodHandle_stack_pushes(mh()) == 0, "DMH does not move stack"); 1649 1650 // Done! 1651 java_lang_invoke_MethodHandle::set_vmentry(mh(), me); 1652 } 1653 1654 void MethodHandles::verify_BoundMethodHandle_with_receiver(Handle mh, 1655 methodHandle m, 1656 TRAPS) { 1657 // Verify type. 1658 KlassHandle bound_recv_type; 1659 { 1660 oop receiver = java_lang_invoke_BoundMethodHandle::argument(mh()); 1661 if (receiver != NULL) 1662 bound_recv_type = KlassHandle(THREAD, receiver->klass()); 1663 } 1664 Handle mtype(THREAD, java_lang_invoke_MethodHandle::type(mh())); 1665 verify_method_type(m, mtype, true, bound_recv_type, CHECK); 1666 1667 int receiver_pos = m->size_of_parameters() - 1; 1668 1669 // Verify MH.vmargslot, which should point at the bound receiver. 1670 verify_vmargslot(mh, -1, java_lang_invoke_BoundMethodHandle::vmargslot(mh()), CHECK); 1671 //verify_vmslots(mh, CHECK); 1672 1673 // Verify vmslots. 1674 if (java_lang_invoke_MethodHandle::vmslots(mh()) != receiver_pos) { 1675 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH (receiver)"); 1676 } 1677 } 1678 1679 // Initialize a BMH with a receiver bound directly to a methodOop. 1680 void MethodHandles::init_BoundMethodHandle_with_receiver(Handle mh, 1681 methodHandle original_m, 1682 KlassHandle receiver_limit, 1683 int decode_flags, 1684 TRAPS) { 1685 // Check arguments. 1686 if (mh.is_null() || original_m.is_null()) { 1687 THROW(vmSymbols::java_lang_InternalError()); 1688 } 1689 1690 KlassHandle receiver_klass; 1691 { 1692 oop receiver_oop = java_lang_invoke_BoundMethodHandle::argument(mh()); 1693 if (receiver_oop != NULL) 1694 receiver_klass = KlassHandle(THREAD, receiver_oop->klass()); 1695 } 1696 methodHandle m = dispatch_decoded_method(original_m, 1697 receiver_limit, decode_flags, 1698 receiver_klass, 1699 CHECK); 1700 if (m.is_null()) { THROW(vmSymbols::java_lang_InternalError()); } 1701 if (m->is_abstract()) { THROW(vmSymbols::java_lang_AbstractMethodError()); } 1702 1703 java_lang_invoke_MethodHandle::init_vmslots(mh()); 1704 int vmargslot = m->size_of_parameters() - 1; 1705 assert(java_lang_invoke_BoundMethodHandle::vmargslot(mh()) == vmargslot, ""); 1706 1707 if (VerifyMethodHandles) { 1708 verify_BoundMethodHandle_with_receiver(mh, m, CHECK); 1709 } 1710 1711 java_lang_invoke_BoundMethodHandle::set_vmtarget(mh(), m()); 1712 1713 DEBUG_ONLY(KlassHandle junk1; int junk2); 1714 assert(MethodHandles::decode_method(mh(), junk1, junk2) == m, "properly stored for later decoding"); 1715 assert(decode_MethodHandle_stack_pushes(mh()) == 1, "BMH pushes one stack slot"); 1716 1717 // Done! 1718 java_lang_invoke_MethodHandle::set_vmentry(mh(), MethodHandles::entry(MethodHandles::_bound_ref_direct_mh)); 1719 } 1720 1721 void MethodHandles::verify_BoundMethodHandle(Handle mh, Handle target, int argnum, 1722 bool direct_to_method, TRAPS) { 1723 Handle ptype_handle(THREAD, 1724 java_lang_invoke_MethodType::ptype(java_lang_invoke_MethodHandle::type(target()), argnum)); 1725 KlassHandle ptype_klass; 1726 BasicType ptype = java_lang_Class::as_BasicType(ptype_handle(), &ptype_klass); 1727 int slots_pushed = type2size[ptype]; 1728 1729 oop argument = java_lang_invoke_BoundMethodHandle::argument(mh()); 1730 1731 const char* err = NULL; 1732 1733 switch (ptype) { 1734 case T_OBJECT: 1735 if (argument != NULL) 1736 // we must implicitly convert from the arg type to the outgoing ptype 1737 err = check_argument_type_change(T_OBJECT, argument->klass(), ptype, ptype_klass(), argnum); 1738 break; 1739 1740 case T_ARRAY: case T_VOID: 1741 assert(false, "array, void do not appear here"); 1742 default: 1743 if (ptype != T_INT && !is_subword_type(ptype)) { 1744 err = "unexpected parameter type"; 1745 break; 1746 } 1747 // check subrange of Integer.value, if necessary 1748 if (argument == NULL || argument->klass() != SystemDictionary::Integer_klass()) { 1749 err = "bound integer argument must be of type java.lang.Integer"; 1750 break; 1751 } 1752 if (ptype != T_INT) { 1753 int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_INT); 1754 jint value = argument->int_field(value_offset); 1755 int vminfo = adapter_unbox_subword_vminfo(ptype); 1756 jint subword = truncate_subword_from_vminfo(value, vminfo); 1757 if (value != subword) { 1758 err = "bound subword value does not fit into the subword type"; 1759 break; 1760 } 1761 } 1762 break; 1763 case T_FLOAT: 1764 case T_DOUBLE: 1765 case T_LONG: 1766 { 1767 // we must implicitly convert from the unboxed arg type to the outgoing ptype 1768 BasicType argbox = java_lang_boxing_object::basic_type(argument); 1769 if (argbox != ptype) { 1770 err = check_argument_type_change(T_OBJECT, (argument == NULL 1771 ? SystemDictionary::Object_klass() 1772 : argument->klass()), 1773 ptype, ptype_klass(), argnum); 1774 assert(err != NULL, "this must be an error"); 1775 } 1776 break; 1777 } 1778 } 1779 1780 if (err == NULL) { 1781 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh())); 1782 if (direct_to_method) { 1783 assert(this_pushes == slots_pushed, "BMH pushes one or two stack slots"); 1784 } else { 1785 int target_pushes = decode_MethodHandle_stack_pushes(target()); 1786 assert(this_pushes == slots_pushed + target_pushes, "BMH stack motion must be correct"); 1787 } 1788 } 1789 1790 if (err == NULL) { 1791 // Verify the rest of the method type. 1792 err = check_method_type_insertion(java_lang_invoke_MethodHandle::type(mh()), 1793 argnum, ptype_handle(), 1794 java_lang_invoke_MethodHandle::type(target())); 1795 } 1796 1797 if (err != NULL) { 1798 THROW_MSG(vmSymbols::java_lang_InternalError(), err); 1799 } 1800 } 1801 1802 void MethodHandles::init_BoundMethodHandle(Handle mh, Handle target, int argnum, TRAPS) { 1803 // Check arguments. 1804 if (mh.is_null() || target.is_null() || !java_lang_invoke_MethodHandle::is_instance(target())) { 1805 THROW(vmSymbols::java_lang_InternalError()); 1806 } 1807 1808 java_lang_invoke_MethodHandle::init_vmslots(mh()); 1809 int argslot = java_lang_invoke_BoundMethodHandle::vmargslot(mh()); 1810 1811 if (VerifyMethodHandles) { 1812 int insert_after = argnum - 1; 1813 verify_vmargslot(mh, insert_after, argslot, CHECK); 1814 verify_vmslots(mh, CHECK); 1815 } 1816 1817 // Get bound type and required slots. 1818 BasicType ptype; 1819 { 1820 oop ptype_oop = java_lang_invoke_MethodType::ptype(java_lang_invoke_MethodHandle::type(target()), argnum); 1821 ptype = java_lang_Class::as_BasicType(ptype_oop); 1822 } 1823 int slots_pushed = type2size[ptype]; 1824 1825 // If (a) the target is a direct non-dispatched method handle, 1826 // or (b) the target is a dispatched direct method handle and we 1827 // are binding the receiver, cut out the middle-man. 1828 // Do this by decoding the DMH and using its methodOop directly as vmtarget. 1829 bool direct_to_method = false; 1830 if (OptimizeMethodHandles && 1831 target->klass() == SystemDictionary::DirectMethodHandle_klass() && 1832 (argnum == 0 || java_lang_invoke_DirectMethodHandle::vmindex(target()) < 0)) { 1833 KlassHandle receiver_limit; int decode_flags = 0; 1834 methodHandle m = decode_method(target(), receiver_limit, decode_flags); 1835 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "DMH failed to decode"); } 1836 DEBUG_ONLY(int m_vmslots = m->size_of_parameters() - slots_pushed); // pos. of 1st arg. 1837 assert(java_lang_invoke_BoundMethodHandle::vmslots(mh()) == m_vmslots, "type w/ m sig"); 1838 if (argnum == 0 && (decode_flags & _dmf_has_receiver) != 0) { 1839 init_BoundMethodHandle_with_receiver(mh, m, 1840 receiver_limit, decode_flags, 1841 CHECK); 1842 return; 1843 } 1844 1845 // Even if it is not a bound receiver, we still might be able 1846 // to bind another argument and still invoke the methodOop directly. 1847 if (!(decode_flags & _dmf_does_dispatch)) { 1848 direct_to_method = true; 1849 java_lang_invoke_BoundMethodHandle::set_vmtarget(mh(), m()); 1850 } 1851 } 1852 if (!direct_to_method) 1853 java_lang_invoke_BoundMethodHandle::set_vmtarget(mh(), target()); 1854 1855 if (VerifyMethodHandles) { 1856 verify_BoundMethodHandle(mh, target, argnum, direct_to_method, CHECK); 1857 } 1858 1859 // Next question: Is this a ref, int, or long bound value? 1860 MethodHandleEntry* me = NULL; 1861 if (ptype == T_OBJECT) { 1862 if (direct_to_method) me = MethodHandles::entry(_bound_ref_direct_mh); 1863 else me = MethodHandles::entry(_bound_ref_mh); 1864 } else if (slots_pushed == 2) { 1865 if (direct_to_method) me = MethodHandles::entry(_bound_long_direct_mh); 1866 else me = MethodHandles::entry(_bound_long_mh); 1867 } else if (slots_pushed == 1) { 1868 if (direct_to_method) me = MethodHandles::entry(_bound_int_direct_mh); 1869 else me = MethodHandles::entry(_bound_int_mh); 1870 } else { 1871 assert(false, ""); 1872 } 1873 1874 // Done! 1875 java_lang_invoke_MethodHandle::set_vmentry(mh(), me); 1876 } 1877 1878 static void throw_InternalError_for_bad_conversion(int conversion, const char* err, TRAPS) { 1879 char msg[200]; 1880 jio_snprintf(msg, sizeof(msg), "bad adapter (conversion=0x%08x): %s", conversion, err); 1881 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), msg); 1882 } 1883 1884 void MethodHandles::verify_AdapterMethodHandle(Handle mh, int argnum, TRAPS) { 1885 jint conversion = java_lang_invoke_AdapterMethodHandle::conversion(mh()); 1886 int argslot = java_lang_invoke_AdapterMethodHandle::vmargslot(mh()); 1887 1888 verify_vmargslot(mh, argnum, argslot, CHECK); 1889 verify_vmslots(mh, CHECK); 1890 1891 jint conv_op = adapter_conversion_op(conversion); 1892 if (!conv_op_valid(conv_op)) { 1893 throw_InternalError_for_bad_conversion(conversion, "unknown conversion op", THREAD); 1894 return; 1895 } 1896 EntryKind ek = adapter_entry_kind(conv_op); 1897 1898 int stack_move = adapter_conversion_stack_move(conversion); 1899 BasicType src = adapter_conversion_src_type(conversion); 1900 BasicType dest = adapter_conversion_dest_type(conversion); 1901 int vminfo = adapter_conversion_vminfo(conversion); // should be zero 1902 1903 Handle argument(THREAD, java_lang_invoke_AdapterMethodHandle::argument(mh())); 1904 Handle target(THREAD, java_lang_invoke_AdapterMethodHandle::vmtarget(mh())); 1905 Handle src_mtype(THREAD, java_lang_invoke_MethodHandle::type(mh())); 1906 Handle dst_mtype(THREAD, java_lang_invoke_MethodHandle::type(target())); 1907 Handle arg_mtype; 1908 1909 const char* err = NULL; 1910 1911 if (err == NULL) { 1912 // Check that the correct argument is supplied, but only if it is required. 1913 switch (ek) { 1914 case _adapter_check_cast: // target type of cast 1915 case _adapter_ref_to_prim: // wrapper type from which to unbox 1916 case _adapter_spread_args: // array type to spread from 1917 if (!java_lang_Class::is_instance(argument()) 1918 || java_lang_Class::is_primitive(argument())) 1919 { err = "adapter requires argument of type java.lang.Class"; break; } 1920 if (ek == _adapter_spread_args) { 1921 // Make sure it is a suitable collection type. (Array, for now.) 1922 Klass* ak = Klass::cast(java_lang_Class::as_klassOop(argument())); 1923 if (!ak->oop_is_array()) 1924 { err = "spread adapter requires argument representing an array class"; break; } 1925 BasicType et = arrayKlass::cast(ak->as_klassOop())->element_type(); 1926 if (et != dest && stack_move <= 0) 1927 { err = "spread adapter requires array class argument of correct type"; break; } 1928 } 1929 break; 1930 case _adapter_prim_to_ref: // boxer MH to use 1931 case _adapter_collect_args: // method handle which collects the args 1932 case _adapter_fold_args: // method handle which collects the args 1933 if (!UseRicochetFrames) { 1934 { err = "box/collect/fold operators are not supported"; break; } 1935 } 1936 if (!java_lang_invoke_MethodHandle::is_instance(argument())) 1937 { err = "MethodHandle adapter argument required"; break; } 1938 arg_mtype = Handle(THREAD, java_lang_invoke_MethodHandle::type(argument())); 1939 break; 1940 default: 1941 if (argument.not_null()) 1942 { err = "adapter has spurious argument"; break; } 1943 break; 1944 } 1945 } 1946 1947 if (err == NULL) { 1948 // Check that the src/dest types are supplied if needed. 1949 // Also check relevant parameter or return types. 1950 switch (ek) { 1951 case _adapter_check_cast: 1952 if (src != T_OBJECT || dest != T_OBJECT) { 1953 err = "adapter requires object src/dest conversion subfields"; 1954 } 1955 break; 1956 case _adapter_prim_to_prim: 1957 if (!is_java_primitive(src) || !is_java_primitive(dest) || src == dest) { 1958 err = "adapter requires primitive src/dest conversion subfields"; break; 1959 } 1960 if ( (src == T_FLOAT || src == T_DOUBLE) && !(dest == T_FLOAT || dest == T_DOUBLE) || 1961 !(src == T_FLOAT || src == T_DOUBLE) && (dest == T_FLOAT || dest == T_DOUBLE)) { 1962 err = "adapter cannot convert beween floating and fixed-point"; break; 1963 } 1964 break; 1965 case _adapter_ref_to_prim: 1966 if (src != T_OBJECT || !is_java_primitive(dest) 1967 || argument() != Klass::cast(SystemDictionary::box_klass(dest))->java_mirror()) { 1968 err = "adapter requires primitive dest conversion subfield"; break; 1969 } 1970 break; 1971 case _adapter_prim_to_ref: 1972 if (!is_java_primitive(src) || dest != T_OBJECT) { 1973 err = "adapter requires primitive src conversion subfield"; break; 1974 } 1975 break; 1976 case _adapter_swap_args: 1977 case _adapter_rot_args: 1978 { 1979 if (!src || src != dest) { 1980 err = "adapter requires src/dest conversion subfields for swap"; break; 1981 } 1982 int swap_size = type2size[src]; 1983 int slot_limit = java_lang_invoke_MethodHandle::vmslots(target()); 1984 int src_slot = argslot; 1985 int dest_slot = vminfo; 1986 bool rotate_up = (src_slot > dest_slot); // upward rotation 1987 int src_arg = argnum; 1988 int dest_arg = argument_slot_to_argnum(dst_mtype(), dest_slot); 1989 verify_vmargslot(mh, dest_arg, dest_slot, CHECK); 1990 if (!(dest_slot >= src_slot + swap_size) && 1991 !(src_slot >= dest_slot + swap_size)) { 1992 err = "source, destination slots must be distinct"; 1993 } else if (ek == _adapter_swap_args && !(src_slot > dest_slot)) { 1994 err = "source of swap must be deeper in stack"; 1995 } else if (ek == _adapter_swap_args) { 1996 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), dest_arg), 1997 java_lang_invoke_MethodType::ptype(dst_mtype(), src_arg), 1998 dest_arg); 1999 } else if (ek == _adapter_rot_args) { 2000 if (rotate_up) { 2001 assert((src_slot > dest_slot) && (src_arg < dest_arg), ""); 2002 // rotate up: [dest_slot..src_slot-ss] --> [dest_slot+ss..src_slot] 2003 // that is: [src_arg+1..dest_arg] --> [src_arg..dest_arg-1] 2004 for (int i = src_arg+1; i <= dest_arg && err == NULL; i++) { 2005 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), i), 2006 java_lang_invoke_MethodType::ptype(dst_mtype(), i-1), 2007 i); 2008 } 2009 } else { // rotate down 2010 assert((src_slot < dest_slot) && (src_arg > dest_arg), ""); 2011 // rotate down: [src_slot+ss..dest_slot] --> [src_slot..dest_slot-ss] 2012 // that is: [dest_arg..src_arg-1] --> [dst_arg+1..src_arg] 2013 for (int i = dest_arg; i <= src_arg-1 && err == NULL; i++) { 2014 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), i), 2015 java_lang_invoke_MethodType::ptype(dst_mtype(), i+1), 2016 i); 2017 } 2018 } 2019 } 2020 if (err == NULL) 2021 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), src_arg), 2022 java_lang_invoke_MethodType::ptype(dst_mtype(), dest_arg), 2023 src_arg); 2024 } 2025 break; 2026 case _adapter_spread_args: 2027 case _adapter_collect_args: 2028 case _adapter_fold_args: 2029 { 2030 bool is_spread = (ek == _adapter_spread_args); 2031 bool is_fold = (ek == _adapter_fold_args); 2032 BasicType coll_type = is_spread ? src : dest; 2033 BasicType elem_type = is_spread ? dest : src; 2034 // coll_type is type of args in collected form (or T_VOID if none) 2035 // elem_type is common type of args in spread form (or T_VOID if missing or heterogeneous) 2036 if (coll_type == 0 || elem_type == 0) { 2037 err = "adapter requires src/dest subfields for spread or collect"; break; 2038 } 2039 if (is_spread && coll_type != T_OBJECT) { 2040 err = "spread adapter requires object type for argument bundle"; break; 2041 } 2042 Handle spread_mtype = (is_spread ? dst_mtype : src_mtype); 2043 int spread_slot = argslot; 2044 int spread_arg = argnum; 2045 int slots_pushed = stack_move / stack_move_unit(); 2046 int coll_slot_count = type2size[coll_type]; 2047 int spread_slot_count = (is_spread ? slots_pushed : -slots_pushed) + coll_slot_count; 2048 if (is_fold) spread_slot_count = argument_slot_count(arg_mtype()); 2049 if (!is_spread) { 2050 int init_slots = argument_slot_count(src_mtype()); 2051 int coll_slots = argument_slot_count(arg_mtype()); 2052 if (spread_slot_count > init_slots || 2053 spread_slot_count != coll_slots) { 2054 err = "collect adapter has inconsistent arg counts"; break; 2055 } 2056 int next_slots = argument_slot_count(dst_mtype()); 2057 int unchanged_slots_in = (init_slots - spread_slot_count); 2058 int unchanged_slots_out = (next_slots - coll_slot_count - (is_fold ? spread_slot_count : 0)); 2059 if (unchanged_slots_in != unchanged_slots_out) { 2060 err = "collect adapter continuation has inconsistent arg counts"; break; 2061 } 2062 } 2063 } 2064 break; 2065 default: 2066 if (src != 0 || dest != 0) { 2067 err = "adapter has spurious src/dest conversion subfields"; break; 2068 } 2069 break; 2070 } 2071 } 2072 2073 if (err == NULL) { 2074 // Check the stack_move subfield. 2075 // It must always report the net change in stack size, positive or negative. 2076 int slots_pushed = stack_move / stack_move_unit(); 2077 switch (ek) { 2078 case _adapter_prim_to_prim: 2079 case _adapter_ref_to_prim: 2080 case _adapter_prim_to_ref: 2081 if (slots_pushed != type2size[dest] - type2size[src]) { 2082 err = "wrong stack motion for primitive conversion"; 2083 } 2084 break; 2085 case _adapter_dup_args: 2086 if (slots_pushed <= 0) { 2087 err = "adapter requires conversion subfield slots_pushed > 0"; 2088 } 2089 break; 2090 case _adapter_drop_args: 2091 if (slots_pushed >= 0) { 2092 err = "adapter requires conversion subfield slots_pushed < 0"; 2093 } 2094 break; 2095 case _adapter_collect_args: 2096 case _adapter_fold_args: 2097 if (slots_pushed > 2) { 2098 err = "adapter requires conversion subfield slots_pushed <= 2"; 2099 } 2100 break; 2101 case _adapter_spread_args: 2102 if (slots_pushed < -1) { 2103 err = "adapter requires conversion subfield slots_pushed >= -1"; 2104 } 2105 break; 2106 default: 2107 if (stack_move != 0) { 2108 err = "adapter has spurious stack_move conversion subfield"; 2109 } 2110 break; 2111 } 2112 if (err == NULL && stack_move != slots_pushed * stack_move_unit()) { 2113 err = "stack_move conversion subfield must be multiple of stack_move_unit"; 2114 } 2115 } 2116 2117 if (err == NULL) { 2118 // Make sure this adapter's stack pushing is accurately recorded. 2119 int slots_pushed = stack_move / stack_move_unit(); 2120 int this_vmslots = java_lang_invoke_MethodHandle::vmslots(mh()); 2121 int target_vmslots = java_lang_invoke_MethodHandle::vmslots(target()); 2122 int target_pushes = decode_MethodHandle_stack_pushes(target()); 2123 if (slots_pushed != (target_vmslots - this_vmslots)) { 2124 err = "stack_move inconsistent with previous and current MethodType vmslots"; 2125 } else { 2126 int this_pushes = decode_MethodHandle_stack_pushes(mh()); 2127 if (slots_pushed + target_pushes != this_pushes) { 2128 if (this_pushes == 0) 2129 err = "adapter push count not initialized"; 2130 else 2131 err = "adapter push count is wrong"; 2132 } 2133 } 2134 2135 // While we're at it, check that the stack motion decoder works: 2136 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh())); 2137 assert(this_pushes == slots_pushed + target_pushes, "AMH stack motion must be correct"); 2138 } 2139 2140 if (err == NULL && vminfo != 0) { 2141 switch (ek) { 2142 case _adapter_swap_args: 2143 case _adapter_rot_args: 2144 case _adapter_prim_to_ref: 2145 case _adapter_collect_args: 2146 case _adapter_fold_args: 2147 break; // OK 2148 default: 2149 err = "vminfo subfield is reserved to the JVM"; 2150 } 2151 } 2152 2153 // Do additional ad hoc checks. 2154 if (err == NULL) { 2155 switch (ek) { 2156 case _adapter_retype_only: 2157 err = check_method_type_passthrough(src_mtype(), dst_mtype(), false); 2158 break; 2159 2160 case _adapter_retype_raw: 2161 err = check_method_type_passthrough(src_mtype(), dst_mtype(), true); 2162 break; 2163 2164 case _adapter_check_cast: 2165 { 2166 // The actual value being checked must be a reference: 2167 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), argnum), 2168 object_java_mirror(), argnum); 2169 if (err != NULL) break; 2170 2171 // The output of the cast must fit with the destination argument: 2172 Handle cast_class = argument; 2173 err = check_method_type_conversion(src_mtype(), 2174 argnum, cast_class(), 2175 dst_mtype()); 2176 } 2177 break; 2178 2179 // %%% TO DO: continue in remaining cases to verify src/dst_mtype if VerifyMethodHandles 2180 } 2181 } 2182 2183 if (err != NULL) { 2184 throw_InternalError_for_bad_conversion(conversion, err, THREAD); 2185 return; 2186 } 2187 2188 } 2189 2190 void MethodHandles::init_AdapterMethodHandle(Handle mh, Handle target, int argnum, TRAPS) { 2191 Handle argument = java_lang_invoke_AdapterMethodHandle::argument(mh()); 2192 int argslot = java_lang_invoke_AdapterMethodHandle::vmargslot(mh()); 2193 jint conversion = java_lang_invoke_AdapterMethodHandle::conversion(mh()); 2194 jint conv_op = adapter_conversion_op(conversion); 2195 2196 // adjust the adapter code to the internal EntryKind enumeration: 2197 EntryKind ek_orig = adapter_entry_kind(conv_op); 2198 EntryKind ek_opt = ek_orig; // may be optimized 2199 EntryKind ek_try; // temp 2200 2201 // Finalize the vmtarget field (Java initialized it to null). 2202 if (!java_lang_invoke_MethodHandle::is_instance(target())) { 2203 throw_InternalError_for_bad_conversion(conversion, "bad target", THREAD); 2204 return; 2205 } 2206 java_lang_invoke_AdapterMethodHandle::set_vmtarget(mh(), target()); 2207 2208 int stack_move = adapter_conversion_stack_move(conversion); 2209 BasicType src = adapter_conversion_src_type(conversion); 2210 BasicType dest = adapter_conversion_dest_type(conversion); 2211 int vminfo = adapter_conversion_vminfo(conversion); // should be zero 2212 2213 int slots_pushed = stack_move / stack_move_unit(); 2214 2215 if (VerifyMethodHandles) { 2216 verify_AdapterMethodHandle(mh, argnum, CHECK); 2217 } 2218 2219 const char* err = NULL; 2220 2221 if (!conv_op_supported(conv_op)) { 2222 err = "adapter not yet implemented in the JVM"; 2223 } 2224 2225 // Now it's time to finish the case analysis and pick a MethodHandleEntry. 2226 switch (ek_orig) { 2227 case _adapter_retype_only: 2228 case _adapter_retype_raw: 2229 case _adapter_check_cast: 2230 case _adapter_dup_args: 2231 case _adapter_drop_args: 2232 // these work fine via general case code 2233 break; 2234 2235 case _adapter_prim_to_prim: 2236 { 2237 // Non-subword cases are {int,float,long,double} -> {int,float,long,double}. 2238 // And, the {float,double} -> {int,long} cases must be handled by Java. 2239 switch (type2size[src] *4+ type2size[dest]) { 2240 case 1 *4+ 1: 2241 assert(src == T_INT || is_subword_type(src), "source is not float"); 2242 // Subword-related cases are int -> {boolean,byte,char,short}. 2243 ek_opt = _adapter_opt_i2i; 2244 vminfo = adapter_prim_to_prim_subword_vminfo(dest); 2245 break; 2246 case 2 *4+ 1: 2247 if (src == T_LONG && (dest == T_INT || is_subword_type(dest))) { 2248 ek_opt = _adapter_opt_l2i; 2249 vminfo = adapter_prim_to_prim_subword_vminfo(dest); 2250 } else if (src == T_DOUBLE && dest == T_FLOAT) { 2251 ek_opt = _adapter_opt_d2f; 2252 } else { 2253 goto throw_not_impl; // runs user code, hence could block 2254 } 2255 break; 2256 case 1 *4+ 2: 2257 if ((src == T_INT || is_subword_type(src)) && dest == T_LONG) { 2258 ek_opt = _adapter_opt_i2l; 2259 } else if (src == T_FLOAT && dest == T_DOUBLE) { 2260 ek_opt = _adapter_opt_f2d; 2261 } else { 2262 goto throw_not_impl; // runs user code, hence could block 2263 } 2264 break; 2265 default: 2266 goto throw_not_impl; // runs user code, hence could block 2267 break; 2268 } 2269 } 2270 break; 2271 2272 case _adapter_ref_to_prim: 2273 { 2274 switch (type2size[dest]) { 2275 case 1: 2276 ek_opt = _adapter_opt_unboxi; 2277 vminfo = adapter_unbox_subword_vminfo(dest); 2278 break; 2279 case 2: 2280 ek_opt = _adapter_opt_unboxl; 2281 break; 2282 default: 2283 goto throw_not_impl; 2284 break; 2285 } 2286 } 2287 break; 2288 2289 case _adapter_prim_to_ref: 2290 { 2291 assert(UseRicochetFrames, "else don't come here"); 2292 // vminfo will be the location to insert the return value 2293 vminfo = argslot; 2294 ek_opt = _adapter_opt_collect_ref; 2295 ensure_vmlayout_field(target, CHECK); 2296 // for MethodHandleWalk: 2297 if (java_lang_invoke_AdapterMethodHandle::is_instance(argument())) 2298 ensure_vmlayout_field(argument, CHECK); 2299 if (!OptimizeMethodHandles) break; 2300 switch (type2size[src]) { 2301 case 1: 2302 ek_try = EntryKind(_adapter_opt_filter_S0_ref + argslot); 2303 if (ek_try < _adapter_opt_collect_LAST && 2304 ek_adapter_opt_collect_slot(ek_try) == argslot) { 2305 assert(ek_adapter_opt_collect_count(ek_try) == 1 && 2306 ek_adapter_opt_collect_type(ek_try) == T_OBJECT, ""); 2307 ek_opt = ek_try; 2308 break; 2309 } 2310 // else downgrade to variable slot: 2311 ek_opt = _adapter_opt_collect_1_ref; 2312 break; 2313 case 2: 2314 ek_try = EntryKind(_adapter_opt_collect_2_S0_ref + argslot); 2315 if (ek_try < _adapter_opt_collect_LAST && 2316 ek_adapter_opt_collect_slot(ek_try) == argslot) { 2317 assert(ek_adapter_opt_collect_count(ek_try) == 2 && 2318 ek_adapter_opt_collect_type(ek_try) == T_OBJECT, ""); 2319 ek_opt = ek_try; 2320 break; 2321 } 2322 // else downgrade to variable slot: 2323 ek_opt = _adapter_opt_collect_2_ref; 2324 break; 2325 default: 2326 goto throw_not_impl; 2327 break; 2328 } 2329 } 2330 break; 2331 2332 case _adapter_swap_args: 2333 case _adapter_rot_args: 2334 { 2335 int swap_slots = type2size[src]; 2336 int slot_limit = java_lang_invoke_AdapterMethodHandle::vmslots(mh()); 2337 int src_slot = argslot; 2338 int dest_slot = vminfo; 2339 int rotate = (ek_orig == _adapter_swap_args) ? 0 : (src_slot > dest_slot) ? 1 : -1; 2340 switch (swap_slots) { 2341 case 1: 2342 ek_opt = (!rotate ? _adapter_opt_swap_1 : 2343 rotate > 0 ? _adapter_opt_rot_1_up : _adapter_opt_rot_1_down); 2344 break; 2345 case 2: 2346 ek_opt = (!rotate ? _adapter_opt_swap_2 : 2347 rotate > 0 ? _adapter_opt_rot_2_up : _adapter_opt_rot_2_down); 2348 break; 2349 default: 2350 goto throw_not_impl; 2351 break; 2352 } 2353 } 2354 break; 2355 2356 case _adapter_spread_args: 2357 { 2358 #ifdef TARGET_ARCH_NYI_6939861 2359 // ports before 6939861 supported only three kinds of spread ops 2360 if (!UseRicochetFrames) { 2361 int array_size = slots_pushed + 1; 2362 assert(array_size >= 0, ""); 2363 vminfo = array_size; 2364 switch (array_size) { 2365 case 0: ek_opt = _adapter_opt_spread_0; break; 2366 case 1: ek_opt = _adapter_opt_spread_1; break; 2367 default: ek_opt = _adapter_opt_spread_more; break; 2368 } 2369 break; 2370 } 2371 #endif //TARGET_ARCH_NYI_6939861 2372 // vminfo will be the required length of the array 2373 int array_size = (slots_pushed + 1) / (type2size[dest] == 2 ? 2 : 1); 2374 vminfo = array_size; 2375 // general case 2376 switch (dest) { 2377 case T_BOOLEAN : // fall through to T_BYTE: 2378 case T_BYTE : ek_opt = _adapter_opt_spread_byte; break; 2379 case T_CHAR : ek_opt = _adapter_opt_spread_char; break; 2380 case T_SHORT : ek_opt = _adapter_opt_spread_short; break; 2381 case T_INT : ek_opt = _adapter_opt_spread_int; break; 2382 case T_LONG : ek_opt = _adapter_opt_spread_long; break; 2383 case T_FLOAT : ek_opt = _adapter_opt_spread_float; break; 2384 case T_DOUBLE : ek_opt = _adapter_opt_spread_double; break; 2385 case T_OBJECT : ek_opt = _adapter_opt_spread_ref; break; 2386 case T_VOID : if (array_size != 0) goto throw_not_impl; 2387 ek_opt = _adapter_opt_spread_ref; break; 2388 default : goto throw_not_impl; 2389 } 2390 assert(array_size == 0 || // it doesn't matter what the spreader is 2391 (ek_adapter_opt_spread_count(ek_opt) == -1 && 2392 (ek_adapter_opt_spread_type(ek_opt) == dest || 2393 (ek_adapter_opt_spread_type(ek_opt) == T_BYTE && dest == T_BOOLEAN))), 2394 err_msg("dest=%d ek_opt=%d", dest, ek_opt)); 2395 2396 if (array_size <= 0) { 2397 // since the general case does not handle length 0, this case is required: 2398 ek_opt = _adapter_opt_spread_0; 2399 break; 2400 } 2401 if (dest == T_OBJECT) { 2402 ek_try = EntryKind(_adapter_opt_spread_1_ref - 1 + array_size); 2403 if (ek_try < _adapter_opt_spread_LAST && 2404 ek_adapter_opt_spread_count(ek_try) == array_size) { 2405 assert(ek_adapter_opt_spread_type(ek_try) == dest, ""); 2406 ek_opt = ek_try; 2407 break; 2408 } 2409 } 2410 break; 2411 } 2412 break; 2413 2414 case _adapter_collect_args: 2415 { 2416 assert(UseRicochetFrames, "else don't come here"); 2417 int elem_slots = argument_slot_count(java_lang_invoke_MethodHandle::type(argument())); 2418 // vminfo will be the location to insert the return value 2419 vminfo = argslot; 2420 ensure_vmlayout_field(target, CHECK); 2421 ensure_vmlayout_field(argument, CHECK); 2422 2423 // general case: 2424 switch (dest) { 2425 default : if (!is_subword_type(dest)) goto throw_not_impl; 2426 // else fall through: 2427 case T_INT : ek_opt = _adapter_opt_collect_int; break; 2428 case T_LONG : ek_opt = _adapter_opt_collect_long; break; 2429 case T_FLOAT : ek_opt = _adapter_opt_collect_float; break; 2430 case T_DOUBLE : ek_opt = _adapter_opt_collect_double; break; 2431 case T_OBJECT : ek_opt = _adapter_opt_collect_ref; break; 2432 case T_VOID : ek_opt = _adapter_opt_collect_void; break; 2433 } 2434 assert(ek_adapter_opt_collect_slot(ek_opt) == -1 && 2435 ek_adapter_opt_collect_count(ek_opt) == -1 && 2436 (ek_adapter_opt_collect_type(ek_opt) == dest || 2437 ek_adapter_opt_collect_type(ek_opt) == T_INT && is_subword_type(dest)), 2438 ""); 2439 2440 if (dest == T_OBJECT && elem_slots == 1 && OptimizeMethodHandles) { 2441 // filter operation on a ref 2442 ek_try = EntryKind(_adapter_opt_filter_S0_ref + argslot); 2443 if (ek_try < _adapter_opt_collect_LAST && 2444 ek_adapter_opt_collect_slot(ek_try) == argslot) { 2445 assert(ek_adapter_opt_collect_count(ek_try) == elem_slots && 2446 ek_adapter_opt_collect_type(ek_try) == dest, ""); 2447 ek_opt = ek_try; 2448 break; 2449 } 2450 ek_opt = _adapter_opt_collect_1_ref; 2451 break; 2452 } 2453 2454 if (dest == T_OBJECT && elem_slots == 2 && OptimizeMethodHandles) { 2455 // filter of two arguments 2456 ek_try = EntryKind(_adapter_opt_collect_2_S0_ref + argslot); 2457 if (ek_try < _adapter_opt_collect_LAST && 2458 ek_adapter_opt_collect_slot(ek_try) == argslot) { 2459 assert(ek_adapter_opt_collect_count(ek_try) == elem_slots && 2460 ek_adapter_opt_collect_type(ek_try) == dest, ""); 2461 ek_opt = ek_try; 2462 break; 2463 } 2464 ek_opt = _adapter_opt_collect_2_ref; 2465 break; 2466 } 2467 2468 if (dest == T_OBJECT && OptimizeMethodHandles) { 2469 // try to use a fixed length adapter 2470 ek_try = EntryKind(_adapter_opt_collect_0_ref + elem_slots); 2471 if (ek_try < _adapter_opt_collect_LAST && 2472 ek_adapter_opt_collect_count(ek_try) == elem_slots) { 2473 assert(ek_adapter_opt_collect_slot(ek_try) == -1 && 2474 ek_adapter_opt_collect_type(ek_try) == dest, ""); 2475 ek_opt = ek_try; 2476 break; 2477 } 2478 } 2479 2480 break; 2481 } 2482 2483 case _adapter_fold_args: 2484 { 2485 assert(UseRicochetFrames, "else don't come here"); 2486 int elem_slots = argument_slot_count(java_lang_invoke_MethodHandle::type(argument())); 2487 // vminfo will be the location to insert the return value 2488 vminfo = argslot + elem_slots; 2489 ensure_vmlayout_field(target, CHECK); 2490 ensure_vmlayout_field(argument, CHECK); 2491 2492 switch (dest) { 2493 default : if (!is_subword_type(dest)) goto throw_not_impl; 2494 // else fall through: 2495 case T_INT : ek_opt = _adapter_opt_fold_int; break; 2496 case T_LONG : ek_opt = _adapter_opt_fold_long; break; 2497 case T_FLOAT : ek_opt = _adapter_opt_fold_float; break; 2498 case T_DOUBLE : ek_opt = _adapter_opt_fold_double; break; 2499 case T_OBJECT : ek_opt = _adapter_opt_fold_ref; break; 2500 case T_VOID : ek_opt = _adapter_opt_fold_void; break; 2501 } 2502 assert(ek_adapter_opt_collect_slot(ek_opt) == -1 && 2503 ek_adapter_opt_collect_count(ek_opt) == -1 && 2504 (ek_adapter_opt_collect_type(ek_opt) == dest || 2505 ek_adapter_opt_collect_type(ek_opt) == T_INT && is_subword_type(dest)), 2506 ""); 2507 2508 if (dest == T_OBJECT && elem_slots == 0 && OptimizeMethodHandles) { 2509 // if there are no args, just pretend it's a collect 2510 ek_opt = _adapter_opt_collect_0_ref; 2511 break; 2512 } 2513 2514 if (dest == T_OBJECT && OptimizeMethodHandles) { 2515 // try to use a fixed length adapter 2516 ek_try = EntryKind(_adapter_opt_fold_1_ref - 1 + elem_slots); 2517 if (ek_try < _adapter_opt_fold_LAST && 2518 ek_adapter_opt_collect_count(ek_try) == elem_slots) { 2519 assert(ek_adapter_opt_collect_slot(ek_try) == -1 && 2520 ek_adapter_opt_collect_type(ek_try) == dest, ""); 2521 ek_opt = ek_try; 2522 break; 2523 } 2524 } 2525 2526 break; 2527 } 2528 2529 default: 2530 // should have failed much earlier; must be a missing case here 2531 assert(false, "incomplete switch"); 2532 // and fall through: 2533 2534 throw_not_impl: 2535 if (err == NULL) 2536 err = "unknown adapter type"; 2537 break; 2538 } 2539 2540 if (err == NULL && (vminfo & CONV_VMINFO_MASK) != vminfo) { 2541 // should not happen, since vminfo is used to encode arg/slot indexes < 255 2542 err = "vminfo overflow"; 2543 } 2544 2545 if (err == NULL && !have_entry(ek_opt)) { 2546 err = "adapter stub for this kind of method handle is missing"; 2547 } 2548 2549 if (err == NULL && ek_opt == ek_orig) { 2550 switch (ek_opt) { 2551 case _adapter_prim_to_prim: 2552 case _adapter_ref_to_prim: 2553 case _adapter_prim_to_ref: 2554 case _adapter_swap_args: 2555 case _adapter_rot_args: 2556 case _adapter_collect_args: 2557 case _adapter_fold_args: 2558 case _adapter_spread_args: 2559 // should be handled completely by optimized cases; see above 2560 err = "init_AdapterMethodHandle should not issue this"; 2561 break; 2562 } 2563 } 2564 2565 if (err != NULL) { 2566 throw_InternalError_for_bad_conversion(conversion, err, THREAD); 2567 return; 2568 } 2569 2570 // Rebuild the conversion value; maybe parts of it were changed. 2571 jint new_conversion = adapter_conversion(conv_op, src, dest, stack_move, vminfo); 2572 2573 // Finalize the conversion field. (Note that it is final to Java code.) 2574 java_lang_invoke_AdapterMethodHandle::set_conversion(mh(), new_conversion); 2575 2576 // Done! 2577 java_lang_invoke_MethodHandle::set_vmentry(mh(), entry(ek_opt)); 2578 2579 // There should be enough memory barriers on exit from native methods 2580 // to ensure that the MH is fully initialized to all threads before 2581 // Java code can publish it in global data structures. 2582 } 2583 2584 void MethodHandles::ensure_vmlayout_field(Handle target, TRAPS) { 2585 Handle mtype(THREAD, java_lang_invoke_MethodHandle::type(target())); 2586 Handle mtform(THREAD, java_lang_invoke_MethodType::form(mtype())); 2587 if (mtform.is_null()) { THROW(vmSymbols::java_lang_InternalError()); } 2588 if (java_lang_invoke_MethodTypeForm::vmlayout_offset_in_bytes() > 0) { 2589 if (java_lang_invoke_MethodTypeForm::vmlayout(mtform()) == NULL) { 2590 // fill it in 2591 Handle erased_mtype(THREAD, java_lang_invoke_MethodTypeForm::erasedType(mtform())); 2592 TempNewSymbol erased_signature 2593 = java_lang_invoke_MethodType::as_signature(erased_mtype(), /*intern:*/true, CHECK); 2594 methodOop cookie 2595 = SystemDictionary::find_method_handle_invoke(vmSymbols::invokeExact_name(), 2596 erased_signature, 2597 SystemDictionaryHandles::Object_klass(), 2598 THREAD); 2599 java_lang_invoke_MethodTypeForm::init_vmlayout(mtform(), cookie); 2600 } 2601 } 2602 } 2603 2604 #ifdef ASSERT 2605 2606 extern "C" 2607 void print_method_handle(oop mh); 2608 2609 static void stress_method_handle_walk_impl(Handle mh, TRAPS) { 2610 if (StressMethodHandleWalk) { 2611 // Exercise the MethodHandleWalk code in various ways and validate 2612 // the resulting method oop. Some of these produce output so they 2613 // are guarded under Verbose. 2614 ResourceMark rm; 2615 HandleMark hm; 2616 if (Verbose) { 2617 print_method_handle(mh()); 2618 } 2619 TempNewSymbol name = SymbolTable::new_symbol("invoke", CHECK); 2620 Handle mt = java_lang_invoke_MethodHandle::type(mh()); 2621 TempNewSymbol signature = java_lang_invoke_MethodType::as_signature(mt(), true, CHECK); 2622 MethodHandleCompiler mhc(mh, name, signature, 10000, false, CHECK); 2623 methodHandle m = mhc.compile(CHECK); 2624 if (Verbose) { 2625 m->print_codes(); 2626 } 2627 InterpreterOopMap mask; 2628 OopMapCache::compute_one_oop_map(m, m->code_size() - 1, &mask); 2629 } 2630 } 2631 2632 static void stress_method_handle_walk(Handle mh, TRAPS) { 2633 stress_method_handle_walk_impl(mh, THREAD); 2634 if (HAS_PENDING_EXCEPTION) { 2635 oop ex = PENDING_EXCEPTION; 2636 CLEAR_PENDING_EXCEPTION; 2637 tty->print("StressMethodHandleWalk: "); 2638 java_lang_Throwable::print(ex, tty); 2639 tty->cr(); 2640 } 2641 } 2642 #else 2643 2644 static void stress_method_handle_walk(Handle mh, TRAPS) {} 2645 2646 #endif 2647 2648 // 2649 // Here are the native methods on sun.invoke.MethodHandleImpl. 2650 // They are the private interface between this JVM and the HotSpot-specific 2651 // Java code that implements JSR 292 method handles. 2652 // 2653 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way 2654 // that intrinsic (non-JNI) native methods are defined in HotSpot. 2655 // 2656 2657 // direct method handles for invokestatic or invokespecial 2658 // void init(DirectMethodHandle self, MemberName ref, boolean doDispatch, Class<?> caller); 2659 JVM_ENTRY(void, MHN_init_DMH(JNIEnv *env, jobject igcls, jobject mh_jh, 2660 jobject target_jh, jboolean do_dispatch, jobject caller_jh)) { 2661 ResourceMark rm; // for error messages 2662 2663 // This is the guy we are initializing: 2664 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } 2665 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); 2666 2667 // Early returns out of this method leave the DMH in an unfinished state. 2668 assert(java_lang_invoke_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); 2669 2670 // which method are we really talking about? 2671 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } 2672 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); 2673 if (java_lang_invoke_MemberName::is_instance(target()) && 2674 java_lang_invoke_MemberName::vmindex(target()) == VM_INDEX_UNINITIALIZED) { 2675 MethodHandles::resolve_MemberName(target, CHECK); 2676 } 2677 2678 KlassHandle receiver_limit; int decode_flags = 0; 2679 methodHandle m = MethodHandles::decode_method(target(), receiver_limit, decode_flags); 2680 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "no such method"); } 2681 2682 // The trusted Java code that calls this method should already have performed 2683 // access checks on behalf of the given caller. But, we can verify this. 2684 if (VerifyMethodHandles && caller_jh != NULL) { 2685 KlassHandle caller(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh))); 2686 // If this were a bytecode, the first access check would be against 2687 // the "reference class" mentioned in the CONSTANT_Methodref. 2688 // We don't know at this point which class that was, and if we 2689 // check against m.method_holder we might get the wrong answer. 2690 // So we just make sure to handle this check when the resolution 2691 // happens, when we call resolve_MemberName. 2692 // 2693 // (A public class can inherit public members from private supers, 2694 // and it would be wrong to check access against the private super 2695 // if the original symbolic reference was against the public class.) 2696 // 2697 // If there were a bytecode, the next step would be to lookup the method 2698 // in the reference class, then then check the method's access bits. 2699 // Emulate LinkResolver::check_method_accessability. 2700 klassOop resolved_klass = m->method_holder(); 2701 if (!Reflection::verify_field_access(caller->as_klassOop(), 2702 resolved_klass, resolved_klass, 2703 m->access_flags(), 2704 true)) { 2705 // %%% following cutout belongs in Reflection::verify_field_access? 2706 bool same_pm = Reflection::is_same_package_member(caller->as_klassOop(), 2707 resolved_klass, THREAD); 2708 if (!same_pm) { 2709 THROW_MSG(vmSymbols::java_lang_InternalError(), m->name_and_sig_as_C_string()); 2710 } 2711 } 2712 } 2713 2714 MethodHandles::init_DirectMethodHandle(mh, m, (do_dispatch != JNI_FALSE), CHECK); 2715 stress_method_handle_walk(mh, CHECK); 2716 } 2717 JVM_END 2718 2719 // bound method handles 2720 JVM_ENTRY(void, MHN_init_BMH(JNIEnv *env, jobject igcls, jobject mh_jh, 2721 jobject target_jh, int argnum)) { 2722 ResourceMark rm; // for error messages 2723 2724 // This is the guy we are initializing: 2725 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } 2726 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); 2727 2728 // Early returns out of this method leave the BMH in an unfinished state. 2729 assert(java_lang_invoke_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); 2730 2731 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } 2732 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); 2733 2734 if (!java_lang_invoke_MethodHandle::is_instance(target())) { 2735 // Target object is a reflective method. (%%% Do we need this alternate path?) 2736 Untested("init_BMH of non-MH"); 2737 if (argnum != 0) { THROW(vmSymbols::java_lang_InternalError()); } 2738 KlassHandle receiver_limit; int decode_flags = 0; 2739 methodHandle m = MethodHandles::decode_method(target(), receiver_limit, decode_flags); 2740 MethodHandles::init_BoundMethodHandle_with_receiver(mh, m, 2741 receiver_limit, 2742 decode_flags, 2743 CHECK); 2744 } else { 2745 // Build a BMH on top of a DMH or another BMH: 2746 MethodHandles::init_BoundMethodHandle(mh, target, argnum, CHECK); 2747 } 2748 stress_method_handle_walk(mh, CHECK); 2749 } 2750 JVM_END 2751 2752 // adapter method handles 2753 JVM_ENTRY(void, MHN_init_AMH(JNIEnv *env, jobject igcls, jobject mh_jh, 2754 jobject target_jh, int argnum)) { 2755 // This is the guy we are initializing: 2756 if (mh_jh == NULL || target_jh == NULL) { 2757 THROW(vmSymbols::java_lang_InternalError()); 2758 } 2759 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); 2760 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); 2761 2762 // Early returns out of this method leave the AMH in an unfinished state. 2763 assert(java_lang_invoke_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); 2764 2765 MethodHandles::init_AdapterMethodHandle(mh, target, argnum, CHECK); 2766 stress_method_handle_walk(mh, CHECK); 2767 } 2768 JVM_END 2769 2770 // method type forms 2771 JVM_ENTRY(void, MHN_init_MT(JNIEnv *env, jobject igcls, jobject erased_jh)) { 2772 if (erased_jh == NULL) return; 2773 if (TraceMethodHandles) { 2774 tty->print("creating MethodType form "); 2775 if (WizardMode || Verbose) { // Warning: this calls Java code on the MH! 2776 // call Object.toString() 2777 Symbol* name = vmSymbols::toString_name(); 2778 Symbol* sig = vmSymbols::void_string_signature(); 2779 JavaCallArguments args(Handle(THREAD, JNIHandles::resolve_non_null(erased_jh))); 2780 JavaValue result(T_OBJECT); 2781 JavaCalls::call_virtual(&result, SystemDictionary::Object_klass(), name, sig, 2782 &args, CHECK); 2783 Handle str(THREAD, (oop)result.get_jobject()); 2784 java_lang_String::print(str, tty); 2785 } 2786 tty->cr(); 2787 } 2788 } 2789 JVM_END 2790 2791 // debugging and reflection 2792 JVM_ENTRY(jobject, MHN_getTarget(JNIEnv *env, jobject igcls, jobject mh_jh, jint format)) { 2793 Handle mh(THREAD, JNIHandles::resolve(mh_jh)); 2794 if (!java_lang_invoke_MethodHandle::is_instance(mh())) { 2795 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); 2796 } 2797 oop target = MethodHandles::encode_target(mh, format, CHECK_NULL); 2798 return JNIHandles::make_local(THREAD, target); 2799 } 2800 JVM_END 2801 2802 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) { 2803 switch (which) { 2804 case MethodHandles::GC_JVM_PUSH_LIMIT: 2805 guarantee(MethodHandlePushLimit >= 2 && MethodHandlePushLimit <= 0xFF, 2806 "MethodHandlePushLimit parameter must be in valid range"); 2807 return MethodHandlePushLimit; 2808 case MethodHandles::GC_JVM_STACK_MOVE_UNIT: 2809 // return number of words per slot, signed according to stack direction 2810 return MethodHandles::stack_move_unit(); 2811 case MethodHandles::GC_CONV_OP_IMPLEMENTED_MASK: 2812 return MethodHandles::adapter_conversion_ops_supported_mask(); 2813 } 2814 return 0; 2815 } 2816 JVM_END 2817 2818 #ifndef PRODUCT 2819 #define EACH_NAMED_CON(template) \ 2820 /* hold back this one until JDK stabilizes */ \ 2821 /* template(MethodHandles,GC_JVM_PUSH_LIMIT) */ \ 2822 /* hold back this one until JDK stabilizes */ \ 2823 /* template(MethodHandles,GC_JVM_STACK_MOVE_UNIT) */ \ 2824 template(MethodHandles,ETF_HANDLE_OR_METHOD_NAME) \ 2825 template(MethodHandles,ETF_DIRECT_HANDLE) \ 2826 template(MethodHandles,ETF_METHOD_NAME) \ 2827 template(MethodHandles,ETF_REFLECT_METHOD) \ 2828 template(java_lang_invoke_MemberName,MN_IS_METHOD) \ 2829 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \ 2830 template(java_lang_invoke_MemberName,MN_IS_FIELD) \ 2831 template(java_lang_invoke_MemberName,MN_IS_TYPE) \ 2832 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \ 2833 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \ 2834 template(java_lang_invoke_MemberName,VM_INDEX_UNINITIALIZED) \ 2835 template(java_lang_invoke_AdapterMethodHandle,OP_RETYPE_ONLY) \ 2836 template(java_lang_invoke_AdapterMethodHandle,OP_RETYPE_RAW) \ 2837 template(java_lang_invoke_AdapterMethodHandle,OP_CHECK_CAST) \ 2838 template(java_lang_invoke_AdapterMethodHandle,OP_PRIM_TO_PRIM) \ 2839 template(java_lang_invoke_AdapterMethodHandle,OP_REF_TO_PRIM) \ 2840 template(java_lang_invoke_AdapterMethodHandle,OP_PRIM_TO_REF) \ 2841 template(java_lang_invoke_AdapterMethodHandle,OP_SWAP_ARGS) \ 2842 template(java_lang_invoke_AdapterMethodHandle,OP_ROT_ARGS) \ 2843 template(java_lang_invoke_AdapterMethodHandle,OP_DUP_ARGS) \ 2844 template(java_lang_invoke_AdapterMethodHandle,OP_DROP_ARGS) \ 2845 template(java_lang_invoke_AdapterMethodHandle,OP_COLLECT_ARGS) \ 2846 template(java_lang_invoke_AdapterMethodHandle,OP_SPREAD_ARGS) \ 2847 /* hold back this one until JDK stabilizes */ \ 2848 /*template(java_lang_invoke_AdapterMethodHandle,CONV_OP_LIMIT)*/ \ 2849 template(java_lang_invoke_AdapterMethodHandle,CONV_OP_MASK) \ 2850 template(java_lang_invoke_AdapterMethodHandle,CONV_VMINFO_MASK) \ 2851 template(java_lang_invoke_AdapterMethodHandle,CONV_VMINFO_SHIFT) \ 2852 template(java_lang_invoke_AdapterMethodHandle,CONV_OP_SHIFT) \ 2853 template(java_lang_invoke_AdapterMethodHandle,CONV_DEST_TYPE_SHIFT) \ 2854 template(java_lang_invoke_AdapterMethodHandle,CONV_SRC_TYPE_SHIFT) \ 2855 template(java_lang_invoke_AdapterMethodHandle,CONV_STACK_MOVE_SHIFT) \ 2856 template(java_lang_invoke_AdapterMethodHandle,CONV_STACK_MOVE_MASK) \ 2857 /*end*/ 2858 2859 #define ONE_PLUS(scope,value) 1+ 2860 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS) 0; 2861 #define VALUE_COMMA(scope,value) scope::value, 2862 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA) 0 }; 2863 #define STRING_NULL(scope,value) #value "\0" 2864 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL) }; 2865 2866 #undef ONE_PLUS 2867 #undef VALUE_COMMA 2868 #undef STRING_NULL 2869 #undef EACH_NAMED_CON 2870 #endif 2871 2872 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { 2873 #ifndef PRODUCT 2874 if (which >= 0 && which < con_value_count) { 2875 int con = con_values[which]; 2876 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh)); 2877 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { 2878 const char* str = &con_names[0]; 2879 for (int i = 0; i < which; i++) 2880 str += strlen(str) + 1; // skip name and null 2881 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint 2882 box->obj_at_put(0, name); 2883 } 2884 return con; 2885 } 2886 #endif 2887 return 0; 2888 } 2889 JVM_END 2890 2891 // void init(MemberName self, AccessibleObject ref) 2892 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { 2893 if (mname_jh == NULL || target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } 2894 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 2895 oop target_oop = JNIHandles::resolve_non_null(target_jh); 2896 MethodHandles::init_MemberName(mname(), target_oop); 2897 } 2898 JVM_END 2899 2900 // void expand(MemberName self) 2901 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { 2902 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } 2903 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 2904 MethodHandles::expand_MemberName(mname, 0, CHECK); 2905 } 2906 JVM_END 2907 2908 // void resolve(MemberName self, Class<?> caller) 2909 JVM_ENTRY(void, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { 2910 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } 2911 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 2912 2913 // The trusted Java code that calls this method should already have performed 2914 // access checks on behalf of the given caller. But, we can verify this. 2915 if (VerifyMethodHandles && caller_jh != NULL) { 2916 klassOop reference_klass = java_lang_Class::as_klassOop(java_lang_invoke_MemberName::clazz(mname())); 2917 if (reference_klass != NULL) { 2918 // Emulate LinkResolver::check_klass_accessability. 2919 klassOop caller = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh)); 2920 if (!Reflection::verify_class_access(caller, 2921 reference_klass, 2922 true)) { 2923 THROW_MSG(vmSymbols::java_lang_InternalError(), Klass::cast(reference_klass)->external_name()); 2924 } 2925 } 2926 } 2927 2928 MethodHandles::resolve_MemberName(mname, CHECK); 2929 } 2930 JVM_END 2931 2932 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 2933 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 2934 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls, 2935 jclass clazz_jh, jstring name_jh, jstring sig_jh, 2936 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { 2937 if (clazz_jh == NULL || results_jh == NULL) return -1; 2938 KlassHandle k(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz_jh))); 2939 2940 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh)); 2941 if (results.is_null() || !results->is_objArray()) return -1; 2942 2943 TempNewSymbol name = NULL; 2944 TempNewSymbol sig = NULL; 2945 if (name_jh != NULL) { 2946 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); 2947 if (name == NULL) return 0; // a match is not possible 2948 } 2949 if (sig_jh != NULL) { 2950 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); 2951 if (sig == NULL) return 0; // a match is not possible 2952 } 2953 2954 KlassHandle caller; 2955 if (caller_jh != NULL) { 2956 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); 2957 if (!java_lang_Class::is_instance(caller_oop)) return -1; 2958 caller = KlassHandle(THREAD, java_lang_Class::as_klassOop(caller_oop)); 2959 } 2960 2961 if (name != NULL && sig != NULL && results.not_null()) { 2962 // try a direct resolve 2963 // %%% TO DO 2964 } 2965 2966 int res = MethodHandles::find_MemberNames(k(), name, sig, mflags, 2967 caller(), skip, results()); 2968 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks 2969 return res; 2970 } 2971 JVM_END 2972 2973 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv *env, jobject igmh, jobjectArray igargs)) { 2974 TempNewSymbol UOE_name = SymbolTable::new_symbol("java/lang/UnsupportedOperationException", CHECK_NULL); 2975 THROW_MSG_NULL(UOE_name, "MethodHandle.invoke cannot be invoked reflectively"); 2976 return NULL; 2977 } 2978 JVM_END 2979 2980 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv *env, jobject igmh, jobjectArray igargs)) { 2981 TempNewSymbol UOE_name = SymbolTable::new_symbol("java/lang/UnsupportedOperationException", CHECK_NULL); 2982 THROW_MSG_NULL(UOE_name, "MethodHandle.invokeExact cannot be invoked reflectively"); 2983 return NULL; 2984 } 2985 JVM_END 2986 2987 2988 /// JVM_RegisterMethodHandleMethods 2989 2990 #define LANG "Ljava/lang/" 2991 #define JLINV "Ljava/lang/invoke/" 2992 2993 #define OBJ LANG"Object;" 2994 #define CLS LANG"Class;" 2995 #define STRG LANG"String;" 2996 #define MT JLINV"MethodType;" 2997 #define MH JLINV"MethodHandle;" 2998 #define MEM JLINV"MemberName;" 2999 #define AMH JLINV"AdapterMethodHandle;" 3000 #define BMH JLINV"BoundMethodHandle;" 3001 #define DMH JLINV"DirectMethodHandle;" 3002 3003 #define CC (char*) /*cast a literal from (const char*)*/ 3004 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 3005 3006 // These are the native methods on sun.invoke.MethodHandleNatives. 3007 static JNINativeMethod methods[] = { 3008 // void init(MemberName self, AccessibleObject ref) 3009 {CC"init", CC"("AMH""MH"I)V", FN_PTR(MHN_init_AMH)}, 3010 {CC"init", CC"("BMH""OBJ"I)V", FN_PTR(MHN_init_BMH)}, 3011 {CC"init", CC"("DMH""OBJ"Z"CLS")V", FN_PTR(MHN_init_DMH)}, 3012 {CC"init", CC"("MT")V", FN_PTR(MHN_init_MT)}, 3013 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)}, 3014 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)}, 3015 {CC"resolve", CC"("MEM""CLS")V", FN_PTR(MHN_resolve_Mem)}, 3016 {CC"getTarget", CC"("MH"I)"OBJ, FN_PTR(MHN_getTarget)}, 3017 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)}, 3018 // static native int getNamedCon(int which, Object[] name) 3019 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)}, 3020 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 3021 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 3022 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)} 3023 }; 3024 3025 static JNINativeMethod invoke_methods[] = { 3026 // void init(MemberName self, AccessibleObject ref) 3027 {CC"invoke", CC"(["OBJ")"OBJ, FN_PTR(MH_invoke_UOE)}, 3028 {CC"invokeExact", CC"(["OBJ")"OBJ, FN_PTR(MH_invokeExact_UOE)} 3029 }; 3030 3031 // This one function is exported, used by NativeLookup. 3032 3033 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { 3034 assert(MethodHandles::spot_check_entry_names(), "entry enum is OK"); 3035 3036 if (!EnableInvokeDynamic) { 3037 warning("JSR 292 is disabled in this JVM. Use -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic to enable."); 3038 return; // bind nothing 3039 } 3040 3041 bool enable_MH = true; 3042 3043 { 3044 ThreadToNativeFromVM ttnfv(thread); 3045 3046 int status = env->RegisterNatives(MHN_class, methods, sizeof(methods)/sizeof(JNINativeMethod)); 3047 if (!env->ExceptionOccurred()) { 3048 const char* L_MH_name = (JLINV "MethodHandle"); 3049 const char* MH_name = L_MH_name+1; 3050 jclass MH_class = env->FindClass(MH_name); 3051 status = env->RegisterNatives(MH_class, invoke_methods, sizeof(invoke_methods)/sizeof(JNINativeMethod)); 3052 } 3053 if (env->ExceptionOccurred()) { 3054 MethodHandles::set_enabled(false); 3055 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); 3056 enable_MH = false; 3057 env->ExceptionClear(); 3058 } 3059 } 3060 3061 if (enable_MH) { 3062 KlassHandle MHN_klass = SystemDictionaryHandles::MethodHandleNatives_klass(); 3063 if (MHN_klass.not_null()) { 3064 TempNewSymbol raiseException_name = SymbolTable::new_symbol("raiseException", CHECK); 3065 TempNewSymbol raiseException_sig = SymbolTable::new_symbol("(ILjava/lang/Object;Ljava/lang/Object;)V", CHECK); 3066 methodOop raiseException_method = instanceKlass::cast(MHN_klass->as_klassOop()) 3067 ->find_method(raiseException_name, raiseException_sig); 3068 if (raiseException_method != NULL && raiseException_method->is_static()) { 3069 MethodHandles::set_raise_exception_method(raiseException_method); 3070 } else { 3071 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); 3072 enable_MH = false; 3073 } 3074 } else { 3075 enable_MH = false; 3076 } 3077 } 3078 3079 if (enable_MH) { 3080 MethodHandles::generate_adapters(); 3081 MethodHandles::set_enabled(true); 3082 } 3083 } 3084 JVM_END