1 /* 2 * Copyright (c) 2008, 2010, 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 /* 26 * JSR 292 reference implementation: method handles 27 */ 28 29 #include "incls/_precompiled.incl" 30 #include "incls/_methodHandles.cpp.incl" 31 32 bool MethodHandles::_enabled = false; // set true after successful native linkage 33 34 MethodHandleEntry* MethodHandles::_entries[MethodHandles::_EK_LIMIT] = {NULL}; 35 const char* MethodHandles::_entry_names[_EK_LIMIT+1] = { 36 "raise_exception", 37 "invokestatic", // how a MH emulates invokestatic 38 "invokespecial", // ditto for the other invokes... 39 "invokevirtual", 40 "invokeinterface", 41 "bound_ref", // these are for BMH... 42 "bound_int", 43 "bound_long", 44 "bound_ref_direct", // (direct versions have a direct methodOop) 45 "bound_int_direct", 46 "bound_long_direct", 47 48 // starting at _adapter_mh_first: 49 "adapter_retype_only", // these are for AMH... 50 "adapter_retype_raw", 51 "adapter_check_cast", 52 "adapter_prim_to_prim", 53 "adapter_ref_to_prim", 54 "adapter_prim_to_ref", 55 "adapter_swap_args", 56 "adapter_rot_args", 57 "adapter_dup_args", 58 "adapter_drop_args", 59 "adapter_collect_args", 60 "adapter_spread_args", 61 "adapter_flyby", 62 "adapter_ricochet", 63 64 // optimized adapter types: 65 "adapter_swap_args/1", 66 "adapter_swap_args/2", 67 "adapter_rot_args/1,up", 68 "adapter_rot_args/1,down", 69 "adapter_rot_args/2,up", 70 "adapter_rot_args/2,down", 71 "adapter_prim_to_prim/i2i", 72 "adapter_prim_to_prim/l2i", 73 "adapter_prim_to_prim/d2f", 74 "adapter_prim_to_prim/i2l", 75 "adapter_prim_to_prim/f2d", 76 "adapter_ref_to_prim/unboxi", 77 "adapter_ref_to_prim/unboxl", 78 "adapter_spread_args/0", 79 "adapter_spread_args/1", 80 "adapter_spread_args/more", 81 82 NULL 83 }; 84 85 // Adapters. 86 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL; 87 int MethodHandles::_adapter_code_size = StubRoutines::method_handles_adapters_code_size; 88 89 jobject MethodHandles::_raise_exception_method; 90 91 #ifdef ASSERT 92 bool MethodHandles::spot_check_entry_names() { 93 assert(!strcmp(entry_name(_invokestatic_mh), "invokestatic"), ""); 94 assert(!strcmp(entry_name(_bound_ref_mh), "bound_ref"), ""); 95 assert(!strcmp(entry_name(_adapter_retype_only), "adapter_retype_only"), ""); 96 assert(!strcmp(entry_name(_adapter_ricochet), "adapter_ricochet"), ""); 97 assert(!strcmp(entry_name(_adapter_opt_unboxi), "adapter_ref_to_prim/unboxi"), ""); 98 return true; 99 } 100 #endif 101 102 103 //------------------------------------------------------------------------------ 104 // MethodHandles::generate_adapters 105 // 106 void MethodHandles::generate_adapters() { 107 if (!EnableMethodHandles || SystemDictionary::MethodHandle_klass() == NULL) return; 108 109 assert(_adapter_code == NULL, "generate only once"); 110 111 ResourceMark rm; 112 TraceTime timer("MethodHandles adapters generation", TraceStartupTime); 113 _adapter_code = MethodHandlesAdapterBlob::create(_adapter_code_size); 114 if (_adapter_code == NULL) 115 vm_exit_out_of_memory(_adapter_code_size, "CodeCache: no room for MethodHandles adapters"); 116 CodeBuffer code(_adapter_code); 117 MethodHandlesAdapterGenerator g(&code); 118 g.generate(); 119 } 120 121 122 //------------------------------------------------------------------------------ 123 // MethodHandlesAdapterGenerator::generate 124 // 125 void MethodHandlesAdapterGenerator::generate() { 126 // Generate generic method handle adapters. 127 for (MethodHandles::EntryKind ek = MethodHandles::_EK_FIRST; 128 ek < MethodHandles::_EK_LIMIT; 129 ek = MethodHandles::EntryKind(1 + (int)ek)) { 130 StubCodeMark mark(this, "MethodHandle", MethodHandles::entry_name(ek)); 131 MethodHandles::generate_method_handle_stub(_masm, ek); 132 } 133 } 134 135 136 void MethodHandles::set_enabled(bool z) { 137 if (_enabled != z) { 138 guarantee(z && EnableMethodHandles, "can only enable once, and only if -XX:+EnableMethodHandles"); 139 _enabled = z; 140 } 141 } 142 143 // Note: A method which does not have a TRAPS argument cannot block in the GC 144 // or throw exceptions. Such methods are used in this file to do something quick 145 // and local, like parse a data structure. For speed, such methods work on plain 146 // oops, not handles. Trapping methods uniformly operate on handles. 147 148 methodOop MethodHandles::decode_vmtarget(oop vmtarget, int vmindex, oop mtype, 149 klassOop& receiver_limit_result, int& decode_flags_result) { 150 if (vmtarget == NULL) return NULL; 151 assert(methodOopDesc::nonvirtual_vtable_index < 0, "encoding"); 152 if (vmindex < 0) { 153 // this DMH performs no dispatch; it is directly bound to a methodOop 154 // A MemberName may either be directly bound to a methodOop, 155 // or it may use the klass/index form; both forms mean the same thing. 156 methodOop m = decode_methodOop(methodOop(vmtarget), decode_flags_result); 157 if ((decode_flags_result & _dmf_has_receiver) != 0 158 && java_dyn_MethodType::is_instance(mtype)) { 159 // Extract receiver type restriction from mtype.ptypes[0]. 160 objArrayOop ptypes = java_dyn_MethodType::ptypes(mtype); 161 oop ptype0 = (ptypes == NULL || ptypes->length() < 1) ? oop(NULL) : ptypes->obj_at(0); 162 if (java_lang_Class::is_instance(ptype0)) 163 receiver_limit_result = java_lang_Class::as_klassOop(ptype0); 164 } 165 if (vmindex == methodOopDesc::nonvirtual_vtable_index) { 166 // this DMH can be an "invokespecial" version 167 decode_flags_result &= ~_dmf_does_dispatch; 168 } else { 169 assert(vmindex == methodOopDesc::invalid_vtable_index, "random vmindex?"); 170 } 171 return m; 172 } else { 173 assert(vmtarget->is_klass(), "must be class or interface"); 174 decode_flags_result |= MethodHandles::_dmf_does_dispatch; 175 decode_flags_result |= MethodHandles::_dmf_has_receiver; 176 receiver_limit_result = (klassOop)vmtarget; 177 Klass* tk = Klass::cast((klassOop)vmtarget); 178 if (tk->is_interface()) { 179 // an itable linkage is <interface, itable index> 180 decode_flags_result |= MethodHandles::_dmf_from_interface; 181 return klassItable::method_for_itable_index((klassOop)vmtarget, vmindex); 182 } else { 183 if (!tk->oop_is_instance()) 184 tk = instanceKlass::cast(SystemDictionary::Object_klass()); 185 return ((instanceKlass*)tk)->method_at_vtable(vmindex); 186 } 187 } 188 } 189 190 // MemberName and DirectMethodHandle have the same linkage to the JVM internals. 191 // (MemberName is the non-operational name used for queries and setup.) 192 193 methodOop MethodHandles::decode_DirectMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { 194 oop vmtarget = sun_dyn_DirectMethodHandle::vmtarget(mh); 195 int vmindex = sun_dyn_DirectMethodHandle::vmindex(mh); 196 oop mtype = sun_dyn_DirectMethodHandle::type(mh); 197 return decode_vmtarget(vmtarget, vmindex, mtype, receiver_limit_result, decode_flags_result); 198 } 199 200 methodOop MethodHandles::decode_BoundMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { 201 assert(sun_dyn_BoundMethodHandle::is_instance(mh), ""); 202 assert(mh->klass() != SystemDictionary::AdapterMethodHandle_klass(), ""); 203 for (oop bmh = mh;;) { 204 // Bound MHs can be stacked to bind several arguments. 205 oop target = java_dyn_MethodHandle::vmtarget(bmh); 206 if (target == NULL) return NULL; 207 decode_flags_result |= MethodHandles::_dmf_binds_argument; 208 klassOop tk = target->klass(); 209 if (tk == SystemDictionary::BoundMethodHandle_klass()) { 210 bmh = target; 211 continue; 212 } else { 213 if (java_dyn_MethodHandle::is_subclass(tk)) { 214 //assert(tk == SystemDictionary::DirectMethodHandle_klass(), "end of BMH chain must be DMH"); 215 return decode_MethodHandle(target, receiver_limit_result, decode_flags_result); 216 } else { 217 // Optimized case: binding a receiver to a non-dispatched DMH 218 // short-circuits directly to the methodOop. 219 // (It might be another argument besides a receiver also.) 220 assert(target->is_method(), "must be a simple method"); 221 decode_flags_result |= MethodHandles::_dmf_binds_method; 222 methodOop m = (methodOop) target; 223 if (!m->is_static()) 224 decode_flags_result |= MethodHandles::_dmf_has_receiver; 225 return m; 226 } 227 } 228 } 229 } 230 231 methodOop MethodHandles::decode_AdapterMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { 232 assert(mh->klass() == SystemDictionary::AdapterMethodHandle_klass(), ""); 233 for (oop amh = mh;;) { 234 // Adapter MHs can be stacked to convert several arguments. 235 int conv_op = adapter_conversion_op(sun_dyn_AdapterMethodHandle::conversion(amh)); 236 decode_flags_result |= (_dmf_adapter_lsb << conv_op) & _DMF_ADAPTER_MASK; 237 oop target = java_dyn_MethodHandle::vmtarget(amh); 238 if (target == NULL) return NULL; 239 klassOop tk = target->klass(); 240 if (tk == SystemDictionary::AdapterMethodHandle_klass()) { 241 amh = target; 242 continue; 243 } else { 244 // must be a BMH (which will bind some more arguments) or a DMH (for the final call) 245 return MethodHandles::decode_MethodHandle(target, receiver_limit_result, decode_flags_result); 246 } 247 } 248 } 249 250 methodOop MethodHandles::decode_MethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { 251 if (mh == NULL) return NULL; 252 klassOop mhk = mh->klass(); 253 assert(java_dyn_MethodHandle::is_subclass(mhk), "must be a MethodHandle"); 254 if (mhk == SystemDictionary::DirectMethodHandle_klass()) { 255 return decode_DirectMethodHandle(mh, receiver_limit_result, decode_flags_result); 256 } else if (mhk == SystemDictionary::BoundMethodHandle_klass()) { 257 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result); 258 } else if (mhk == SystemDictionary::AdapterMethodHandle_klass()) { 259 return decode_AdapterMethodHandle(mh, receiver_limit_result, decode_flags_result); 260 } else if (sun_dyn_BoundMethodHandle::is_subclass(mhk)) { 261 // could be a JavaMethodHandle (but not an adapter MH) 262 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result); 263 } else { 264 assert(false, "cannot parse this MH"); 265 return NULL; // random MH? 266 } 267 } 268 269 methodOop MethodHandles::decode_methodOop(methodOop m, int& decode_flags_result) { 270 assert(m->is_method(), ""); 271 if (m->is_static()) { 272 // check that signature begins '(L' or '([' (not '(I', '()', etc.) 273 symbolOop sig = m->signature(); 274 BasicType recv_bt = char2type(sig->byte_at(1)); 275 // Note: recv_bt might be T_ILLEGAL if byte_at(2) is ')' 276 assert(sig->byte_at(0) == '(', "must be method sig"); 277 // if (recv_bt == T_OBJECT || recv_bt == T_ARRAY) 278 // decode_flags_result |= _dmf_has_receiver; 279 } else { 280 // non-static method 281 decode_flags_result |= _dmf_has_receiver; 282 if (!m->can_be_statically_bound() && !m->is_initializer()) { 283 decode_flags_result |= _dmf_does_dispatch; 284 if (Klass::cast(m->method_holder())->is_interface()) 285 decode_flags_result |= _dmf_from_interface; 286 } 287 } 288 return m; 289 } 290 291 292 // A trusted party is handing us a cookie to determine a method. 293 // Let's boil it down to the method oop they really want. 294 methodOop MethodHandles::decode_method(oop x, klassOop& receiver_limit_result, int& decode_flags_result) { 295 decode_flags_result = 0; 296 receiver_limit_result = NULL; 297 klassOop xk = x->klass(); 298 if (xk == Universe::methodKlassObj()) { 299 return decode_methodOop((methodOop) x, decode_flags_result); 300 } else if (xk == SystemDictionary::MemberName_klass()) { 301 // Note: This only works if the MemberName has already been resolved. 302 return decode_MemberName(x, receiver_limit_result, decode_flags_result); 303 } else if (java_dyn_MethodHandle::is_subclass(xk)) { 304 return decode_MethodHandle(x, receiver_limit_result, decode_flags_result); 305 } else if (xk == SystemDictionary::reflect_Method_klass()) { 306 oop clazz = java_lang_reflect_Method::clazz(x); 307 int slot = java_lang_reflect_Method::slot(x); 308 klassOop k = java_lang_Class::as_klassOop(clazz); 309 if (k != NULL && Klass::cast(k)->oop_is_instance()) 310 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot), 311 decode_flags_result); 312 } else if (xk == SystemDictionary::reflect_Constructor_klass()) { 313 oop clazz = java_lang_reflect_Constructor::clazz(x); 314 int slot = java_lang_reflect_Constructor::slot(x); 315 klassOop k = java_lang_Class::as_klassOop(clazz); 316 if (k != NULL && Klass::cast(k)->oop_is_instance()) 317 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot), 318 decode_flags_result); 319 } else { 320 // unrecognized object 321 assert(!x->is_method(), "already checked"); 322 assert(!sun_dyn_MemberName::is_instance(x), "already checked"); 323 } 324 return NULL; 325 } 326 327 328 int MethodHandles::decode_MethodHandle_stack_pushes(oop mh) { 329 if (mh->klass() == SystemDictionary::DirectMethodHandle_klass()) 330 return 0; // no push/pop 331 int this_vmslots = java_dyn_MethodHandle::vmslots(mh); 332 int last_vmslots = 0; 333 oop last_mh = mh; 334 for (;;) { 335 oop target = java_dyn_MethodHandle::vmtarget(last_mh); 336 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) { 337 last_vmslots = java_dyn_MethodHandle::vmslots(target); 338 break; 339 } else if (!java_dyn_MethodHandle::is_instance(target)) { 340 // might be klass or method 341 assert(target->is_method(), "must get here with a direct ref to method"); 342 last_vmslots = methodOop(target)->size_of_parameters(); 343 break; 344 } 345 last_mh = target; 346 } 347 // If I am called with fewer VM slots than my ultimate callee, 348 // it must be that I push the additionally needed slots. 349 // Likewise if am called with more VM slots, I will pop them. 350 return (last_vmslots - this_vmslots); 351 } 352 353 354 // MemberName support 355 356 // import sun_dyn_MemberName.* 357 enum { 358 IS_METHOD = sun_dyn_MemberName::MN_IS_METHOD, 359 IS_CONSTRUCTOR = sun_dyn_MemberName::MN_IS_CONSTRUCTOR, 360 IS_FIELD = sun_dyn_MemberName::MN_IS_FIELD, 361 IS_TYPE = sun_dyn_MemberName::MN_IS_TYPE, 362 SEARCH_SUPERCLASSES = sun_dyn_MemberName::MN_SEARCH_SUPERCLASSES, 363 SEARCH_INTERFACES = sun_dyn_MemberName::MN_SEARCH_INTERFACES, 364 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE, 365 VM_INDEX_UNINITIALIZED = sun_dyn_MemberName::VM_INDEX_UNINITIALIZED 366 }; 367 368 Handle MethodHandles::new_MemberName(TRAPS) { 369 Handle empty; 370 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass()); 371 if (!k->is_initialized()) k->initialize(CHECK_(empty)); 372 return Handle(THREAD, k->allocate_instance(THREAD)); 373 } 374 375 void MethodHandles::init_MemberName(oop mname_oop, oop target_oop) { 376 if (target_oop->klass() == SystemDictionary::reflect_Field_klass()) { 377 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() 378 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() 379 int mods = java_lang_reflect_Field::modifiers(target_oop); 380 klassOop k = java_lang_Class::as_klassOop(clazz); 381 int offset = instanceKlass::cast(k)->offset_from_fields(slot); 382 init_MemberName(mname_oop, k, accessFlags_from(mods), offset); 383 } else { 384 int decode_flags = 0; klassOop receiver_limit = NULL; 385 methodOop m = MethodHandles::decode_method(target_oop, 386 receiver_limit, decode_flags); 387 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0); 388 init_MemberName(mname_oop, m, do_dispatch); 389 } 390 } 391 392 void MethodHandles::init_MemberName(oop mname_oop, methodOop m, bool do_dispatch) { 393 int flags = ((m->is_initializer() ? IS_CONSTRUCTOR : IS_METHOD) 394 | (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS )); 395 oop vmtarget = m; 396 int vmindex = methodOopDesc::invalid_vtable_index; // implies no info yet 397 if (!do_dispatch || (flags & IS_CONSTRUCTOR) || m->can_be_statically_bound()) 398 vmindex = methodOopDesc::nonvirtual_vtable_index; // implies never any dispatch 399 assert(vmindex != VM_INDEX_UNINITIALIZED, "Java sentinel value"); 400 sun_dyn_MemberName::set_vmtarget(mname_oop, vmtarget); 401 sun_dyn_MemberName::set_vmindex(mname_oop, vmindex); 402 sun_dyn_MemberName::set_flags(mname_oop, flags); 403 sun_dyn_MemberName::set_clazz(mname_oop, Klass::cast(m->method_holder())->java_mirror()); 404 } 405 406 void MethodHandles::init_MemberName(oop mname_oop, klassOop field_holder, AccessFlags mods, int offset) { 407 int flags = (IS_FIELD | (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS )); 408 oop vmtarget = field_holder; 409 int vmindex = offset; // determines the field uniquely when combined with static bit 410 assert(vmindex != VM_INDEX_UNINITIALIZED, "bad alias on vmindex"); 411 sun_dyn_MemberName::set_vmtarget(mname_oop, vmtarget); 412 sun_dyn_MemberName::set_vmindex(mname_oop, vmindex); 413 sun_dyn_MemberName::set_flags(mname_oop, flags); 414 sun_dyn_MemberName::set_clazz(mname_oop, Klass::cast(field_holder)->java_mirror()); 415 } 416 417 418 methodOop MethodHandles::decode_MemberName(oop mname, klassOop& receiver_limit_result, int& decode_flags_result) { 419 int flags = sun_dyn_MemberName::flags(mname); 420 if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) == 0) return NULL; // not invocable 421 oop vmtarget = sun_dyn_MemberName::vmtarget(mname); 422 int vmindex = sun_dyn_MemberName::vmindex(mname); 423 if (vmindex == VM_INDEX_UNINITIALIZED) return NULL; // not resolved 424 methodOop m = decode_vmtarget(vmtarget, vmindex, NULL, receiver_limit_result, decode_flags_result); 425 oop clazz = sun_dyn_MemberName::clazz(mname); 426 if (clazz != NULL && java_lang_Class::is_instance(clazz)) { 427 klassOop klass = java_lang_Class::as_klassOop(clazz); 428 if (klass != NULL) receiver_limit_result = klass; 429 } 430 return m; 431 } 432 433 // An unresolved member name is a mere symbolic reference. 434 // Resolving it plants a vmtarget/vmindex in it, 435 // which refers dirctly to JVM internals. 436 void MethodHandles::resolve_MemberName(Handle mname, TRAPS) { 437 assert(sun_dyn_MemberName::is_instance(mname()), ""); 438 #ifdef ASSERT 439 // If this assert throws, renegotiate the sentinel value used by the Java code, 440 // so that it is distinct from any valid vtable index value, and any special 441 // values defined in methodOopDesc::VtableIndexFlag. 442 // The point of the slop is to give the Java code and the JVM some room 443 // to independently specify sentinel values. 444 const int sentinel_slop = 10; 445 const int sentinel_limit = methodOopDesc::highest_unused_vtable_index_value - sentinel_slop; 446 assert(VM_INDEX_UNINITIALIZED < sentinel_limit, "Java sentinel != JVM sentinels"); 447 #endif 448 if (sun_dyn_MemberName::vmindex(mname()) != VM_INDEX_UNINITIALIZED) 449 return; // already resolved 450 oop defc_oop = sun_dyn_MemberName::clazz(mname()); 451 oop name_str = sun_dyn_MemberName::name(mname()); 452 oop type_str = sun_dyn_MemberName::type(mname()); 453 int flags = sun_dyn_MemberName::flags(mname()); 454 455 if (defc_oop == NULL || name_str == NULL || type_str == NULL) { 456 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve"); 457 } 458 klassOop defc_klassOop = java_lang_Class::as_klassOop(defc_oop); 459 defc_oop = NULL; // safety 460 if (defc_klassOop == NULL) return; // a primitive; no resolution possible 461 if (!Klass::cast(defc_klassOop)->oop_is_instance()) { 462 if (!Klass::cast(defc_klassOop)->oop_is_array()) return; 463 defc_klassOop = SystemDictionary::Object_klass(); 464 } 465 instanceKlassHandle defc(THREAD, defc_klassOop); 466 defc_klassOop = NULL; // safety 467 if (defc.is_null()) { 468 THROW_MSG(vmSymbols::java_lang_InternalError(), "primitive class"); 469 } 470 defc->link_class(CHECK); 471 472 // convert the external string name to an internal symbol 473 symbolHandle name(THREAD, java_lang_String::as_symbol_or_null(name_str)); 474 if (name.is_null()) return; // no such name 475 name_str = NULL; // safety 476 477 Handle polymorphic_method_type; 478 bool polymorphic_signature = false; 479 if ((flags & ALL_KINDS) == IS_METHOD && 480 (defc() == SystemDictionary::InvokeDynamic_klass() || 481 (defc() == SystemDictionary::MethodHandle_klass() && 482 methodOopDesc::is_method_handle_invoke_name(name())))) 483 polymorphic_signature = true; 484 485 // convert the external string or reflective type to an internal signature 486 symbolHandle type; { 487 symbolOop type_sym = NULL; 488 if (java_dyn_MethodType::is_instance(type_str)) { 489 type_sym = java_dyn_MethodType::as_signature(type_str, polymorphic_signature, CHECK); 490 if (polymorphic_signature) 491 polymorphic_method_type = Handle(THREAD, type_str); //preserve exactly 492 } else if (java_lang_Class::is_instance(type_str)) { 493 type_sym = java_lang_Class::as_signature(type_str, false, CHECK); 494 } else if (java_lang_String::is_instance(type_str)) { 495 if (polymorphic_signature) { 496 type = java_lang_String::as_symbol(type_str, CHECK); 497 } else { 498 type_sym = java_lang_String::as_symbol_or_null(type_str); 499 } 500 } else { 501 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized type"); 502 } 503 if (type_sym != NULL) 504 type = symbolHandle(THREAD, type_sym); 505 } 506 if (type.is_null()) return; // no such signature exists in the VM 507 type_str = NULL; // safety 508 509 // Time to do the lookup. 510 switch (flags & ALL_KINDS) { 511 case IS_METHOD: 512 { 513 CallInfo result; 514 { 515 EXCEPTION_MARK; 516 if ((flags & JVM_ACC_STATIC) != 0) { 517 LinkResolver::resolve_static_call(result, 518 defc, name, type, KlassHandle(), false, false, THREAD); 519 } else if (defc->is_interface()) { 520 LinkResolver::resolve_interface_call(result, Handle(), defc, 521 defc, name, type, KlassHandle(), false, false, THREAD); 522 } else { 523 LinkResolver::resolve_virtual_call(result, Handle(), defc, 524 defc, name, type, KlassHandle(), false, false, THREAD); 525 } 526 if (HAS_PENDING_EXCEPTION) { 527 CLEAR_PENDING_EXCEPTION; 528 break; // go to second chance 529 } 530 } 531 methodHandle m = result.resolved_method(); 532 oop vmtarget = NULL; 533 int vmindex = methodOopDesc::nonvirtual_vtable_index; 534 if (defc->is_interface()) { 535 vmindex = klassItable::compute_itable_index(m()); 536 assert(vmindex >= 0, ""); 537 } else if (result.has_vtable_index()) { 538 vmindex = result.vtable_index(); 539 assert(vmindex >= 0, ""); 540 } 541 assert(vmindex != VM_INDEX_UNINITIALIZED, ""); 542 if (vmindex < 0) { 543 assert(result.is_statically_bound(), ""); 544 vmtarget = m(); 545 } else { 546 vmtarget = result.resolved_klass()->as_klassOop(); 547 } 548 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS); 549 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget); 550 sun_dyn_MemberName::set_vmindex(mname(), vmindex); 551 sun_dyn_MemberName::set_modifiers(mname(), mods); 552 DEBUG_ONLY(int junk; klassOop junk2); 553 assert(decode_MemberName(mname(), junk2, junk) == result.resolved_method()(), 554 "properly stored for later decoding"); 555 return; 556 } 557 case IS_CONSTRUCTOR: 558 { 559 CallInfo result; 560 { 561 EXCEPTION_MARK; 562 if (name() == vmSymbols::object_initializer_name()) { 563 LinkResolver::resolve_special_call(result, 564 defc, name, type, KlassHandle(), false, THREAD); 565 } else { 566 break; // will throw after end of switch 567 } 568 if (HAS_PENDING_EXCEPTION) { 569 CLEAR_PENDING_EXCEPTION; 570 return; 571 } 572 } 573 assert(result.is_statically_bound(), ""); 574 methodHandle m = result.resolved_method(); 575 oop vmtarget = m(); 576 int vmindex = methodOopDesc::nonvirtual_vtable_index; 577 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS); 578 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget); 579 sun_dyn_MemberName::set_vmindex(mname(), vmindex); 580 sun_dyn_MemberName::set_modifiers(mname(), mods); 581 DEBUG_ONLY(int junk; klassOop junk2); 582 assert(decode_MemberName(mname(), junk2, junk) == result.resolved_method()(), 583 "properly stored for later decoding"); 584 return; 585 } 586 case IS_FIELD: 587 { 588 // This is taken from LinkResolver::resolve_field, sans access checks. 589 fieldDescriptor fd; // find_field initializes fd if found 590 KlassHandle sel_klass(THREAD, instanceKlass::cast(defc())->find_field(name(), type(), &fd)); 591 // check if field exists; i.e., if a klass containing the field def has been selected 592 if (sel_klass.is_null()) return; 593 oop vmtarget = sel_klass->as_klassOop(); 594 int vmindex = fd.offset(); 595 int mods = (fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS); 596 if (vmindex == VM_INDEX_UNINITIALIZED) break; // should not happen 597 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget); 598 sun_dyn_MemberName::set_vmindex(mname(), vmindex); 599 sun_dyn_MemberName::set_modifiers(mname(), mods); 600 return; 601 } 602 default: 603 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); 604 } 605 606 // Second chance. 607 if (polymorphic_method_type.not_null()) { 608 // Look on a non-null class loader. 609 Handle cur_class_loader; 610 const int nptypes = java_dyn_MethodType::ptype_count(polymorphic_method_type()); 611 for (int i = 0; i <= nptypes; i++) { 612 oop type_mirror; 613 if (i < nptypes) type_mirror = java_dyn_MethodType::ptype(polymorphic_method_type(), i); 614 else type_mirror = java_dyn_MethodType::rtype(polymorphic_method_type()); 615 klassOop example_type = java_lang_Class::as_klassOop(type_mirror); 616 if (example_type == NULL) continue; 617 oop class_loader = Klass::cast(example_type)->class_loader(); 618 if (class_loader == NULL || class_loader == cur_class_loader()) continue; 619 cur_class_loader = Handle(THREAD, class_loader); 620 methodOop m = SystemDictionary::find_method_handle_invoke(name, 621 type, 622 KlassHandle(THREAD, example_type), 623 THREAD); 624 if (HAS_PENDING_EXCEPTION) { 625 CLEAR_PENDING_EXCEPTION; 626 m = NULL; 627 // try again with a different class loader... 628 } 629 if (m != NULL) { 630 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS); 631 sun_dyn_MemberName::set_vmtarget(mname(), m); 632 sun_dyn_MemberName::set_vmindex(mname(), m->vtable_index()); 633 sun_dyn_MemberName::set_modifiers(mname(), mods); 634 return; 635 } 636 } 637 } 638 } 639 640 // Conversely, a member name which is only initialized from JVM internals 641 // may have null defc, name, and type fields. 642 // Resolving it plants a vmtarget/vmindex in it, 643 // which refers directly to JVM internals. 644 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { 645 assert(sun_dyn_MemberName::is_instance(mname()), ""); 646 oop vmtarget = sun_dyn_MemberName::vmtarget(mname()); 647 int vmindex = sun_dyn_MemberName::vmindex(mname()); 648 if (vmtarget == NULL || vmindex == VM_INDEX_UNINITIALIZED) { 649 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); 650 } 651 652 bool have_defc = (sun_dyn_MemberName::clazz(mname()) != NULL); 653 bool have_name = (sun_dyn_MemberName::name(mname()) != NULL); 654 bool have_type = (sun_dyn_MemberName::type(mname()) != NULL); 655 int flags = sun_dyn_MemberName::flags(mname()); 656 657 if (suppress != 0) { 658 if (suppress & _suppress_defc) have_defc = true; 659 if (suppress & _suppress_name) have_name = true; 660 if (suppress & _suppress_type) have_type = true; 661 } 662 663 if (have_defc && have_name && have_type) return; // nothing needed 664 665 switch (flags & ALL_KINDS) { 666 case IS_METHOD: 667 case IS_CONSTRUCTOR: 668 { 669 klassOop receiver_limit = NULL; 670 int decode_flags = 0; 671 methodHandle m(THREAD, decode_vmtarget(vmtarget, vmindex, NULL, 672 receiver_limit, decode_flags)); 673 if (m.is_null()) break; 674 if (!have_defc) { 675 klassOop defc = m->method_holder(); 676 if (receiver_limit != NULL && receiver_limit != defc 677 && Klass::cast(receiver_limit)->is_subtype_of(defc)) 678 defc = receiver_limit; 679 sun_dyn_MemberName::set_clazz(mname(), Klass::cast(defc)->java_mirror()); 680 } 681 if (!have_name) { 682 //not java_lang_String::create_from_symbol; let's intern member names 683 Handle name = StringTable::intern(m->name(), CHECK); 684 sun_dyn_MemberName::set_name(mname(), name()); 685 } 686 if (!have_type) { 687 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); 688 sun_dyn_MemberName::set_type(mname(), type()); 689 } 690 return; 691 } 692 case IS_FIELD: 693 { 694 // This is taken from LinkResolver::resolve_field, sans access checks. 695 if (!vmtarget->is_klass()) break; 696 if (!Klass::cast((klassOop) vmtarget)->oop_is_instance()) break; 697 instanceKlassHandle defc(THREAD, (klassOop) vmtarget); 698 bool is_static = ((flags & JVM_ACC_STATIC) != 0); 699 fieldDescriptor fd; // find_field initializes fd if found 700 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) 701 break; // cannot expand 702 if (!have_defc) { 703 sun_dyn_MemberName::set_clazz(mname(), defc->java_mirror()); 704 } 705 if (!have_name) { 706 //not java_lang_String::create_from_symbol; let's intern member names 707 Handle name = StringTable::intern(fd.name(), CHECK); 708 sun_dyn_MemberName::set_name(mname(), name()); 709 } 710 if (!have_type) { 711 Handle type = java_lang_String::create_from_symbol(fd.signature(), CHECK); 712 sun_dyn_MemberName::set_type(mname(), type()); 713 } 714 return; 715 } 716 } 717 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); 718 } 719 720 int MethodHandles::find_MemberNames(klassOop k, 721 symbolOop name, symbolOop sig, 722 int mflags, klassOop caller, 723 int skip, objArrayOop results) { 724 DEBUG_ONLY(No_Safepoint_Verifier nsv); 725 // this code contains no safepoints! 726 727 // %%% take caller into account! 728 729 if (k == NULL || !Klass::cast(k)->oop_is_instance()) return -1; 730 731 int rfill = 0, rlimit = results->length(), rskip = skip; 732 // overflow measurement: 733 int overflow = 0, overflow_limit = MAX2(1000, rlimit); 734 735 int match_flags = mflags; 736 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); 737 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); 738 bool local_only = !(search_superc | search_intfc); 739 bool classes_only = false; 740 741 if (name != NULL) { 742 if (name->utf8_length() == 0) return 0; // a match is not possible 743 } 744 if (sig != NULL) { 745 if (sig->utf8_length() == 0) return 0; // a match is not possible 746 if (sig->byte_at(0) == '(') 747 match_flags &= ~(IS_FIELD | IS_TYPE); 748 else 749 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); 750 } 751 752 if ((match_flags & IS_TYPE) != 0) { 753 // NYI, and Core Reflection works quite well for this query 754 } 755 756 if ((match_flags & IS_FIELD) != 0) { 757 for (FieldStream st(k, local_only, !search_intfc); !st.eos(); st.next()) { 758 if (name != NULL && st.name() != name) 759 continue; 760 if (sig != NULL && st.signature() != sig) 761 continue; 762 // passed the filters 763 if (rskip > 0) { 764 --rskip; 765 } else if (rfill < rlimit) { 766 oop result = results->obj_at(rfill++); 767 if (!sun_dyn_MemberName::is_instance(result)) 768 return -99; // caller bug! 769 MethodHandles::init_MemberName(result, st.klass()->as_klassOop(), st.access_flags(), st.offset()); 770 } else if (++overflow >= overflow_limit) { 771 match_flags = 0; break; // got tired of looking at overflow 772 } 773 } 774 } 775 776 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { 777 // watch out for these guys: 778 symbolOop init_name = vmSymbols::object_initializer_name(); 779 symbolOop clinit_name = vmSymbols::class_initializer_name(); 780 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> 781 bool negate_name_test = false; 782 // fix name so that it captures the intention of IS_CONSTRUCTOR 783 if (!(match_flags & IS_METHOD)) { 784 // constructors only 785 if (name == NULL) { 786 name = init_name; 787 } else if (name != init_name) { 788 return 0; // no constructors of this method name 789 } 790 } else if (!(match_flags & IS_CONSTRUCTOR)) { 791 // methods only 792 if (name == NULL) { 793 name = init_name; 794 negate_name_test = true; // if we see the name, we *omit* the entry 795 } else if (name == init_name) { 796 return 0; // no methods of this constructor name 797 } 798 } else { 799 // caller will accept either sort; no need to adjust name 800 } 801 for (MethodStream st(k, local_only, !search_intfc); !st.eos(); st.next()) { 802 methodOop m = st.method(); 803 symbolOop m_name = m->name(); 804 if (m_name == clinit_name) 805 continue; 806 if (name != NULL && ((m_name != name) ^ negate_name_test)) 807 continue; 808 if (sig != NULL && m->signature() != sig) 809 continue; 810 // passed the filters 811 if (rskip > 0) { 812 --rskip; 813 } else if (rfill < rlimit) { 814 oop result = results->obj_at(rfill++); 815 if (!sun_dyn_MemberName::is_instance(result)) 816 return -99; // caller bug! 817 MethodHandles::init_MemberName(result, m, true); 818 } else if (++overflow >= overflow_limit) { 819 match_flags = 0; break; // got tired of looking at overflow 820 } 821 } 822 } 823 824 // return number of elements we at leasted wanted to initialize 825 return rfill + overflow; 826 } 827 828 829 // Decode this java.lang.Class object into an instanceKlass, if possible. 830 // Throw IAE if not 831 instanceKlassHandle MethodHandles::resolve_instance_klass(oop java_mirror_oop, TRAPS) { 832 instanceKlassHandle empty; 833 klassOop caller = NULL; 834 if (java_lang_Class::is_instance(java_mirror_oop)) { 835 caller = java_lang_Class::as_klassOop(java_mirror_oop); 836 } 837 if (caller == NULL || !Klass::cast(caller)->oop_is_instance()) { 838 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not a class", empty); 839 } 840 return instanceKlassHandle(THREAD, caller); 841 } 842 843 844 845 // Decode the vmtarget field of a method handle. 846 // Sanitize out methodOops, klassOops, and any other non-Java data. 847 // This is for debugging and reflection. 848 oop MethodHandles::encode_target(Handle mh, int format, TRAPS) { 849 assert(java_dyn_MethodHandle::is_instance(mh()), "must be a MH"); 850 if (format == ETF_HANDLE_OR_METHOD_NAME) { 851 oop target = java_dyn_MethodHandle::vmtarget(mh()); 852 if (target == NULL) { 853 return NULL; // unformed MH 854 } 855 klassOop tklass = target->klass(); 856 if (Klass::cast(tklass)->is_subclass_of(SystemDictionary::Object_klass())) { 857 return target; // target is another MH (or something else?) 858 } 859 } 860 if (format == ETF_DIRECT_HANDLE) { 861 oop target = mh(); 862 for (;;) { 863 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) { 864 return target; 865 } 866 if (!java_dyn_MethodHandle::is_instance(target)){ 867 return NULL; // unformed MH 868 } 869 target = java_dyn_MethodHandle::vmtarget(target); 870 } 871 } 872 // cases of metadata in MH.vmtarget: 873 // - AMH can have methodOop for static invoke with bound receiver 874 // - DMH can have methodOop for static invoke (on variable receiver) 875 // - DMH can have klassOop for dispatched (non-static) invoke 876 klassOop receiver_limit = NULL; 877 int decode_flags = 0; 878 methodOop m = decode_MethodHandle(mh(), receiver_limit, decode_flags); 879 if (m == NULL) return NULL; 880 switch (format) { 881 case ETF_REFLECT_METHOD: 882 // same as jni_ToReflectedMethod: 883 if (m->is_initializer()) { 884 return Reflection::new_constructor(m, THREAD); 885 } else { 886 return Reflection::new_method(m, UseNewReflection, false, THREAD); 887 } 888 889 case ETF_HANDLE_OR_METHOD_NAME: // method, not handle 890 case ETF_METHOD_NAME: 891 { 892 if (SystemDictionary::MemberName_klass() == NULL) break; 893 instanceKlassHandle mname_klass(THREAD, SystemDictionary::MemberName_klass()); 894 mname_klass->initialize(CHECK_NULL); 895 Handle mname = mname_klass->allocate_instance_handle(CHECK_NULL); 896 sun_dyn_MemberName::set_vmindex(mname(), VM_INDEX_UNINITIALIZED); 897 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0); 898 init_MemberName(mname(), m, do_dispatch); 899 expand_MemberName(mname, 0, CHECK_NULL); 900 return mname(); 901 } 902 } 903 904 // Unknown format code. 905 char msg[50]; 906 jio_snprintf(msg, sizeof(msg), "unknown getTarget format=%d", format); 907 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), msg); 908 } 909 910 static const char* always_null_names[] = { 911 "java/lang/Void", 912 "java/lang/Null", 913 //"java/lang/Nothing", 914 "sun/dyn/empty/Empty", 915 NULL 916 }; 917 918 static bool is_always_null_type(klassOop klass) { 919 if (!Klass::cast(klass)->oop_is_instance()) return false; 920 instanceKlass* ik = instanceKlass::cast(klass); 921 // Must be on the boot class path: 922 if (ik->class_loader() != NULL) return false; 923 // Check the name. 924 symbolOop name = ik->name(); 925 for (int i = 0; ; i++) { 926 const char* test_name = always_null_names[i]; 927 if (test_name == NULL) break; 928 if (name->equals(test_name)) 929 return true; 930 } 931 return false; 932 } 933 934 bool MethodHandles::class_cast_needed(klassOop src, klassOop dst) { 935 if (src == dst || dst == SystemDictionary::Object_klass()) 936 return false; // quickest checks 937 Klass* srck = Klass::cast(src); 938 Klass* dstk = Klass::cast(dst); 939 if (dstk->is_interface()) { 940 // interface receivers can safely be viewed as untyped, 941 // because interface calls always include a dynamic check 942 //dstk = Klass::cast(SystemDictionary::Object_klass()); 943 return false; 944 } 945 if (srck->is_interface()) { 946 // interface arguments must be viewed as untyped 947 //srck = Klass::cast(SystemDictionary::Object_klass()); 948 return true; 949 } 950 if (is_always_null_type(src)) { 951 // some source types are known to be never instantiated; 952 // they represent references which are always null 953 // such null references never fail to convert safely 954 return false; 955 } 956 return !srck->is_subclass_of(dstk->as_klassOop()); 957 } 958 959 static oop object_java_mirror() { 960 return Klass::cast(SystemDictionary::Object_klass())->java_mirror(); 961 } 962 963 bool MethodHandles::same_basic_type_for_arguments(BasicType src, 964 BasicType dst, 965 bool raw, 966 bool for_return) { 967 if (for_return) { 968 // return values can always be forgotten: 969 if (dst == T_VOID) return true; 970 if (src == T_VOID) return raw && (dst == T_INT); 971 // We allow caller to receive a garbage int, which is harmless. 972 // This trick is pulled by trusted code (see VerifyType.canPassRaw). 973 } 974 assert(src != T_VOID && dst != T_VOID, "should not be here"); 975 if (src == dst) return true; 976 if (type2size[src] != type2size[dst]) return false; 977 // allow reinterpretation casts for integral widening 978 if (is_subword_type(src)) { // subwords can fit in int or other subwords 979 if (dst == T_INT) // any subword fits in an int 980 return true; 981 if (src == T_BOOLEAN) // boolean fits in any subword 982 return is_subword_type(dst); 983 if (src == T_BYTE && dst == T_SHORT) 984 return true; // remaining case: byte fits in short 985 } 986 // allow float/fixed reinterpretation casts 987 if (src == T_FLOAT) return dst == T_INT; 988 if (src == T_INT) return dst == T_FLOAT; 989 if (src == T_DOUBLE) return dst == T_LONG; 990 if (src == T_LONG) return dst == T_DOUBLE; 991 return false; 992 } 993 994 const char* MethodHandles::check_method_receiver(methodOop m, 995 klassOop passed_recv_type) { 996 assert(!m->is_static(), "caller resp."); 997 if (passed_recv_type == NULL) 998 return "receiver type is primitive"; 999 if (class_cast_needed(passed_recv_type, m->method_holder())) { 1000 Klass* formal = Klass::cast(m->method_holder()); 1001 return SharedRuntime::generate_class_cast_message("receiver type", 1002 formal->external_name()); 1003 } 1004 return NULL; // checks passed 1005 } 1006 1007 // Verify that m's signature can be called type-safely by a method handle 1008 // of the given method type 'mtype'. 1009 // It takes a TRAPS argument because it must perform symbol lookups. 1010 void MethodHandles::verify_method_signature(methodHandle m, 1011 Handle mtype, 1012 int first_ptype_pos, 1013 KlassHandle insert_ptype, 1014 TRAPS) { 1015 objArrayHandle ptypes(THREAD, java_dyn_MethodType::ptypes(mtype())); 1016 int pnum = first_ptype_pos; 1017 int pmax = ptypes->length(); 1018 int mnum = 0; // method argument 1019 const char* err = NULL; 1020 for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) { 1021 oop ptype_oop = NULL; 1022 if (ss.at_return_type()) { 1023 if (pnum != pmax) 1024 { err = "too many arguments"; break; } 1025 ptype_oop = java_dyn_MethodType::rtype(mtype()); 1026 } else { 1027 if (pnum >= pmax) 1028 { err = "not enough arguments"; break; } 1029 if (pnum >= 0) 1030 ptype_oop = ptypes->obj_at(pnum); 1031 else if (insert_ptype.is_null()) 1032 ptype_oop = NULL; 1033 else 1034 ptype_oop = insert_ptype->java_mirror(); 1035 pnum += 1; 1036 mnum += 1; 1037 } 1038 klassOop pklass = NULL; 1039 BasicType ptype = T_OBJECT; 1040 if (ptype_oop != NULL) 1041 ptype = java_lang_Class::as_BasicType(ptype_oop, &pklass); 1042 else 1043 // null does not match any non-reference; use Object to report the error 1044 pklass = SystemDictionary::Object_klass(); 1045 klassOop mklass = NULL; 1046 BasicType mtype = ss.type(); 1047 if (mtype == T_ARRAY) mtype = T_OBJECT; // fold all refs to T_OBJECT 1048 if (mtype == T_OBJECT) { 1049 if (ptype_oop == NULL) { 1050 // null matches any reference 1051 continue; 1052 } 1053 KlassHandle pklass_handle(THREAD, pklass); pklass = NULL; 1054 // If we fail to resolve types at this point, we will throw an error. 1055 symbolOop name_oop = ss.as_symbol(CHECK); 1056 symbolHandle name(THREAD, name_oop); 1057 instanceKlass* mk = instanceKlass::cast(m->method_holder()); 1058 Handle loader(THREAD, mk->class_loader()); 1059 Handle domain(THREAD, mk->protection_domain()); 1060 mklass = SystemDictionary::resolve_or_null(name, loader, domain, CHECK); 1061 pklass = pklass_handle(); 1062 if (mklass == NULL && pklass != NULL && 1063 Klass::cast(pklass)->name() == name() && 1064 m->is_method_handle_invoke()) { 1065 // Assume a match. We can't really decode the signature of MH.invoke*. 1066 continue; 1067 } 1068 } 1069 if (!ss.at_return_type()) { 1070 err = check_argument_type_change(ptype, pklass, mtype, mklass, mnum); 1071 } else { 1072 err = check_return_type_change(mtype, mklass, ptype, pklass); // note reversal! 1073 } 1074 if (err != NULL) break; 1075 } 1076 1077 if (err != NULL) { 1078 THROW_MSG(vmSymbols::java_lang_InternalError(), err); 1079 } 1080 } 1081 1082 // Main routine for verifying the MethodHandle.type of a proposed 1083 // direct or bound-direct method handle. 1084 void MethodHandles::verify_method_type(methodHandle m, 1085 Handle mtype, 1086 bool has_bound_recv, 1087 KlassHandle bound_recv_type, 1088 TRAPS) { 1089 bool m_needs_receiver = !m->is_static(); 1090 1091 const char* err = NULL; 1092 1093 int first_ptype_pos = m_needs_receiver ? 1 : 0; 1094 if (has_bound_recv) { 1095 first_ptype_pos -= 1; // ptypes do not include the bound argument; start earlier in them 1096 if (m_needs_receiver && bound_recv_type.is_null()) 1097 { err = "bound receiver is not an object"; goto die; } 1098 } 1099 1100 if (m_needs_receiver && err == NULL) { 1101 objArrayOop ptypes = java_dyn_MethodType::ptypes(mtype()); 1102 if (ptypes->length() < first_ptype_pos) 1103 { err = "receiver argument is missing"; goto die; } 1104 if (has_bound_recv) 1105 err = check_method_receiver(m(), bound_recv_type->as_klassOop()); 1106 else 1107 err = check_method_receiver(m(), java_lang_Class::as_klassOop(ptypes->obj_at(first_ptype_pos-1))); 1108 if (err != NULL) goto die; 1109 } 1110 1111 // Check the other arguments for mistypes. 1112 verify_method_signature(m, mtype, first_ptype_pos, bound_recv_type, CHECK); 1113 return; 1114 1115 die: 1116 THROW_MSG(vmSymbols::java_lang_InternalError(), err); 1117 } 1118 1119 void MethodHandles::verify_vmslots(Handle mh, TRAPS) { 1120 // Verify vmslots. 1121 int check_slots = argument_slot_count(java_dyn_MethodHandle::type(mh())); 1122 if (java_dyn_MethodHandle::vmslots(mh()) != check_slots) { 1123 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH"); 1124 } 1125 } 1126 1127 void MethodHandles::verify_vmargslot(Handle mh, int argnum, int argslot, TRAPS) { 1128 // Verify that argslot points at the given argnum. 1129 int check_slot = argument_slot(java_dyn_MethodHandle::type(mh()), argnum); 1130 if (argslot != check_slot || argslot < 0) { 1131 const char* fmt = "for argnum of %d, vmargslot is %d, should be %d"; 1132 size_t msglen = strlen(fmt) + 3*11 + 1; 1133 char* msg = NEW_RESOURCE_ARRAY(char, msglen); 1134 jio_snprintf(msg, msglen, fmt, argnum, argslot, check_slot); 1135 THROW_MSG(vmSymbols::java_lang_InternalError(), msg); 1136 } 1137 } 1138 1139 // Verify the correspondence between two method types. 1140 // Apart from the advertised changes, caller method type X must 1141 // be able to invoke the callee method Y type with no violations 1142 // of type integrity. 1143 // Return NULL if all is well, else a short error message. 1144 const char* MethodHandles::check_method_type_change(oop src_mtype, int src_beg, int src_end, 1145 int insert_argnum, oop insert_type, 1146 int change_argnum, oop change_type, 1147 int delete_argnum, 1148 oop dst_mtype, int dst_beg, int dst_end, 1149 bool raw) { 1150 objArrayOop src_ptypes = java_dyn_MethodType::ptypes(src_mtype); 1151 objArrayOop dst_ptypes = java_dyn_MethodType::ptypes(dst_mtype); 1152 1153 int src_max = src_ptypes->length(); 1154 int dst_max = dst_ptypes->length(); 1155 1156 if (src_end == -1) src_end = src_max; 1157 if (dst_end == -1) dst_end = dst_max; 1158 1159 assert(0 <= src_beg && src_beg <= src_end && src_end <= src_max, "oob"); 1160 assert(0 <= dst_beg && dst_beg <= dst_end && dst_end <= dst_max, "oob"); 1161 1162 // pending actions; set to -1 when done: 1163 int ins_idx = insert_argnum, chg_idx = change_argnum, del_idx = delete_argnum; 1164 1165 const char* err = NULL; 1166 1167 // Walk along each array of parameter types, including a virtual 1168 // NULL end marker at the end of each. 1169 for (int src_idx = src_beg, dst_idx = dst_beg; 1170 (src_idx <= src_end && dst_idx <= dst_end); 1171 src_idx++, dst_idx++) { 1172 oop src_type = (src_idx == src_end) ? oop(NULL) : src_ptypes->obj_at(src_idx); 1173 oop dst_type = (dst_idx == dst_end) ? oop(NULL) : dst_ptypes->obj_at(dst_idx); 1174 bool fix_null_src_type = false; 1175 1176 // Perform requested edits. 1177 if (ins_idx == src_idx) { 1178 // note that the inserted guy is never affected by a change or deletion 1179 ins_idx = -1; 1180 src_type = insert_type; 1181 fix_null_src_type = true; 1182 --src_idx; // back up to process src type on next loop 1183 src_idx = src_end; 1184 } else { 1185 // note that the changed guy can be immediately deleted 1186 if (chg_idx == src_idx) { 1187 chg_idx = -1; 1188 assert(src_idx < src_end, "oob"); 1189 src_type = change_type; 1190 fix_null_src_type = true; 1191 } 1192 if (del_idx == src_idx) { 1193 del_idx = -1; 1194 assert(src_idx < src_end, "oob"); 1195 --dst_idx; 1196 continue; // rerun loop after skipping this position 1197 } 1198 } 1199 1200 if (src_type == NULL && fix_null_src_type) 1201 // explicit null in this case matches any dest reference 1202 src_type = (java_lang_Class::is_primitive(dst_type) ? object_java_mirror() : dst_type); 1203 1204 // Compare the two argument types. 1205 if (src_type != dst_type) { 1206 if (src_type == NULL) return "not enough arguments"; 1207 if (dst_type == NULL) return "too many arguments"; 1208 err = check_argument_type_change(src_type, dst_type, dst_idx, raw); 1209 if (err != NULL) return err; 1210 } 1211 } 1212 1213 // Now compare return types also. 1214 oop src_rtype = java_dyn_MethodType::rtype(src_mtype); 1215 oop dst_rtype = java_dyn_MethodType::rtype(dst_mtype); 1216 if (src_rtype != dst_rtype) { 1217 err = check_return_type_change(dst_rtype, src_rtype, raw); // note reversal! 1218 if (err != NULL) return err; 1219 } 1220 1221 assert(err == NULL, ""); 1222 return NULL; // all is well 1223 } 1224 1225 1226 const char* MethodHandles::check_argument_type_change(BasicType src_type, 1227 klassOop src_klass, 1228 BasicType dst_type, 1229 klassOop dst_klass, 1230 int argnum, 1231 bool raw) { 1232 const char* err = NULL; 1233 bool for_return = (argnum < 0); 1234 1235 // just in case: 1236 if (src_type == T_ARRAY) src_type = T_OBJECT; 1237 if (dst_type == T_ARRAY) dst_type = T_OBJECT; 1238 1239 // Produce some nice messages if VerifyMethodHandles is turned on: 1240 if (!same_basic_type_for_arguments(src_type, dst_type, raw, for_return)) { 1241 if (src_type == T_OBJECT) { 1242 if (raw && dst_type == T_INT && is_always_null_type(src_klass)) 1243 return NULL; // OK to convert a null pointer to a garbage int 1244 err = ((argnum >= 0) 1245 ? "type mismatch: passing a %s for method argument #%d, which expects primitive %s" 1246 : "type mismatch: returning a %s, but caller expects primitive %s"); 1247 } else if (dst_type == T_OBJECT) { 1248 err = ((argnum >= 0) 1249 ? "type mismatch: passing a primitive %s for method argument #%d, which expects %s" 1250 : "type mismatch: returning a primitive %s, but caller expects %s"); 1251 } else { 1252 err = ((argnum >= 0) 1253 ? "type mismatch: passing a %s for method argument #%d, which expects %s" 1254 : "type mismatch: returning a %s, but caller expects %s"); 1255 } 1256 } else if (src_type == T_OBJECT && dst_type == T_OBJECT && 1257 class_cast_needed(src_klass, dst_klass)) { 1258 if (!class_cast_needed(dst_klass, src_klass)) { 1259 if (raw) 1260 return NULL; // reverse cast is OK; the MH target is trusted to enforce it 1261 err = ((argnum >= 0) 1262 ? "cast required: passing a %s for method argument #%d, which expects %s" 1263 : "cast required: returning a %s, but caller expects %s"); 1264 } else { 1265 err = ((argnum >= 0) 1266 ? "reference mismatch: passing a %s for method argument #%d, which expects %s" 1267 : "reference mismatch: returning a %s, but caller expects %s"); 1268 } 1269 } else { 1270 // passed the obstacle course 1271 return NULL; 1272 } 1273 1274 // format, format, format 1275 const char* src_name = type2name(src_type); 1276 const char* dst_name = type2name(dst_type); 1277 if (src_type == T_OBJECT) src_name = Klass::cast(src_klass)->external_name(); 1278 if (dst_type == T_OBJECT) dst_name = Klass::cast(dst_klass)->external_name(); 1279 if (src_name == NULL) src_name = "unknown type"; 1280 if (dst_name == NULL) dst_name = "unknown type"; 1281 1282 size_t msglen = strlen(err) + strlen(src_name) + strlen(dst_name) + (argnum < 10 ? 1 : 11); 1283 char* msg = NEW_RESOURCE_ARRAY(char, msglen + 1); 1284 if (argnum >= 0) { 1285 assert(strstr(err, "%d") != NULL, ""); 1286 jio_snprintf(msg, msglen, err, src_name, argnum, dst_name); 1287 } else { 1288 assert(strstr(err, "%d") == NULL, ""); 1289 jio_snprintf(msg, msglen, err, src_name, dst_name); 1290 } 1291 return msg; 1292 } 1293 1294 // Compute the depth within the stack of the given argument, i.e., 1295 // the combined size of arguments to the right of the given argument. 1296 // For the last argument (ptypes.length-1) this will be zero. 1297 // For the first argument (0) this will be the size of all 1298 // arguments but that one. For the special number -1, this 1299 // will be the size of all arguments, including the first. 1300 // If the argument is neither -1 nor a valid argument index, 1301 // then return a negative number. Otherwise, the result 1302 // is in the range [0..vmslots] inclusive. 1303 int MethodHandles::argument_slot(oop method_type, int arg) { 1304 objArrayOop ptypes = java_dyn_MethodType::ptypes(method_type); 1305 int argslot = 0; 1306 int len = ptypes->length(); 1307 if (arg < -1 || arg >= len) return -99; 1308 for (int i = len-1; i > arg; i--) { 1309 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i)); 1310 argslot += type2size[bt]; 1311 } 1312 assert(argument_slot_to_argnum(method_type, argslot) == arg, "inverse works"); 1313 return argslot; 1314 } 1315 1316 // Given a slot number, return the argument number. 1317 int MethodHandles::argument_slot_to_argnum(oop method_type, int query_argslot) { 1318 objArrayOop ptypes = java_dyn_MethodType::ptypes(method_type); 1319 int argslot = 0; 1320 int len = ptypes->length(); 1321 for (int i = len-1; i >= 0; i--) { 1322 if (query_argslot == argslot) return i; 1323 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i)); 1324 argslot += type2size[bt]; 1325 } 1326 // return pseudo-arg deepest in stack: 1327 if (query_argslot == argslot) return -1; 1328 return -99; // oob slot, or splitting a double-slot arg 1329 } 1330 1331 methodHandle MethodHandles::dispatch_decoded_method(methodHandle m, 1332 KlassHandle receiver_limit, 1333 int decode_flags, 1334 KlassHandle receiver_klass, 1335 TRAPS) { 1336 assert((decode_flags & ~_DMF_DIRECT_MASK) == 0, "must be direct method reference"); 1337 assert((decode_flags & _dmf_has_receiver) != 0, "must have a receiver or first reference argument"); 1338 1339 if (!m->is_static() && 1340 (receiver_klass.is_null() || !receiver_klass->is_subtype_of(m->method_holder()))) 1341 // given type does not match class of method, or receiver is null! 1342 // caller should have checked this, but let's be extra careful... 1343 return methodHandle(); 1344 1345 if (receiver_limit.not_null() && 1346 (receiver_klass.not_null() && !receiver_klass->is_subtype_of(receiver_limit()))) 1347 // given type is not limited to the receiver type 1348 // note that a null receiver can match any reference value, for a static method 1349 return methodHandle(); 1350 1351 if (!(decode_flags & MethodHandles::_dmf_does_dispatch)) { 1352 // pre-dispatched or static method (null receiver is OK for static) 1353 return m; 1354 1355 } else if (receiver_klass.is_null()) { 1356 // null receiver value; cannot dispatch 1357 return methodHandle(); 1358 1359 } else if (!(decode_flags & MethodHandles::_dmf_from_interface)) { 1360 // perform virtual dispatch 1361 int vtable_index = m->vtable_index(); 1362 guarantee(vtable_index >= 0, "valid vtable index"); 1363 1364 // receiver_klass might be an arrayKlassOop but all vtables start at 1365 // the same place. The cast is to avoid virtual call and assertion. 1366 // See also LinkResolver::runtime_resolve_virtual_method. 1367 instanceKlass* inst = (instanceKlass*)Klass::cast(receiver_klass()); 1368 DEBUG_ONLY(inst->verify_vtable_index(vtable_index)); 1369 methodOop m_oop = inst->method_at_vtable(vtable_index); 1370 return methodHandle(THREAD, m_oop); 1371 1372 } else { 1373 // perform interface dispatch 1374 int itable_index = klassItable::compute_itable_index(m()); 1375 guarantee(itable_index >= 0, "valid itable index"); 1376 instanceKlass* inst = instanceKlass::cast(receiver_klass()); 1377 methodOop m_oop = inst->method_at_itable(m->method_holder(), itable_index, THREAD); 1378 return methodHandle(THREAD, m_oop); 1379 } 1380 } 1381 1382 void MethodHandles::verify_DirectMethodHandle(Handle mh, methodHandle m, TRAPS) { 1383 // Verify type. 1384 Handle mtype(THREAD, java_dyn_MethodHandle::type(mh())); 1385 verify_method_type(m, mtype, false, KlassHandle(), CHECK); 1386 1387 // Verify vmslots. 1388 if (java_dyn_MethodHandle::vmslots(mh()) != m->size_of_parameters()) { 1389 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in DMH"); 1390 } 1391 } 1392 1393 void MethodHandles::init_DirectMethodHandle(Handle mh, methodHandle m, bool do_dispatch, TRAPS) { 1394 // Check arguments. 1395 if (mh.is_null() || m.is_null() || 1396 (!do_dispatch && m->is_abstract())) { 1397 THROW(vmSymbols::java_lang_InternalError()); 1398 } 1399 1400 java_dyn_MethodHandle::init_vmslots(mh()); 1401 1402 if (VerifyMethodHandles) { 1403 // The privileged code which invokes this routine should not make 1404 // a mistake about types, but it's better to verify. 1405 verify_DirectMethodHandle(mh, m, CHECK); 1406 } 1407 1408 // Finally, after safety checks are done, link to the target method. 1409 // We will follow the same path as the latter part of 1410 // InterpreterRuntime::resolve_invoke(), which first finds the method 1411 // and then decides how to populate the constant pool cache entry 1412 // that links the interpreter calls to the method. We need the same 1413 // bits, and will use the same calling sequence code. 1414 1415 int vmindex = methodOopDesc::garbage_vtable_index; 1416 oop vmtarget = NULL; 1417 1418 instanceKlass::cast(m->method_holder())->link_class(CHECK); 1419 1420 MethodHandleEntry* me = NULL; 1421 if (do_dispatch && Klass::cast(m->method_holder())->is_interface()) { 1422 // We are simulating an invokeinterface instruction. 1423 // (We might also be simulating an invokevirtual on a miranda method, 1424 // but it is safe to treat it as an invokeinterface.) 1425 assert(!m->can_be_statically_bound(), "no final methods on interfaces"); 1426 vmindex = klassItable::compute_itable_index(m()); 1427 assert(vmindex >= 0, "(>=0) == do_dispatch"); 1428 // Set up same bits as ConstantPoolCacheEntry::set_interface_call(). 1429 vmtarget = m->method_holder(); // the interface 1430 me = MethodHandles::entry(MethodHandles::_invokeinterface_mh); 1431 } else if (!do_dispatch || m->can_be_statically_bound()) { 1432 // We are simulating an invokestatic or invokespecial instruction. 1433 // Set up the method pointer, just like ConstantPoolCacheEntry::set_method(). 1434 vmtarget = m(); 1435 // this does not help dispatch, but it will make it possible to parse this MH: 1436 vmindex = methodOopDesc::nonvirtual_vtable_index; 1437 assert(vmindex < 0, "(>=0) == do_dispatch"); 1438 if (!m->is_static()) { 1439 me = MethodHandles::entry(MethodHandles::_invokespecial_mh); 1440 } else { 1441 me = MethodHandles::entry(MethodHandles::_invokestatic_mh); 1442 // Part of the semantics of a static call is an initialization barrier. 1443 // For a DMH, it is done now, when the handle is created. 1444 Klass* k = Klass::cast(m->method_holder()); 1445 if (k->should_be_initialized()) { 1446 k->initialize(CHECK); 1447 } 1448 } 1449 } else { 1450 // We are simulating an invokevirtual instruction. 1451 // Set up the vtable index, just like ConstantPoolCacheEntry::set_method(). 1452 // The key logic is LinkResolver::runtime_resolve_virtual_method. 1453 vmindex = m->vtable_index(); 1454 vmtarget = m->method_holder(); 1455 me = MethodHandles::entry(MethodHandles::_invokevirtual_mh); 1456 } 1457 1458 if (me == NULL) { THROW(vmSymbols::java_lang_InternalError()); } 1459 1460 sun_dyn_DirectMethodHandle::set_vmtarget(mh(), vmtarget); 1461 sun_dyn_DirectMethodHandle::set_vmindex(mh(), vmindex); 1462 DEBUG_ONLY(int flags; klassOop rlimit); 1463 assert(MethodHandles::decode_method(mh(), rlimit, flags) == m(), 1464 "properly stored for later decoding"); 1465 DEBUG_ONLY(bool actual_do_dispatch = ((flags & _dmf_does_dispatch) != 0)); 1466 assert(!(actual_do_dispatch && !do_dispatch), 1467 "do not perform dispatch if !do_dispatch specified"); 1468 assert(actual_do_dispatch == (vmindex >= 0), "proper later decoding of do_dispatch"); 1469 assert(decode_MethodHandle_stack_pushes(mh()) == 0, "DMH does not move stack"); 1470 1471 // Done! 1472 java_dyn_MethodHandle::set_vmentry(mh(), me); 1473 } 1474 1475 void MethodHandles::verify_BoundMethodHandle_with_receiver(Handle mh, 1476 methodHandle m, 1477 TRAPS) { 1478 // Verify type. 1479 oop receiver = sun_dyn_BoundMethodHandle::argument(mh()); 1480 Handle mtype(THREAD, java_dyn_MethodHandle::type(mh())); 1481 KlassHandle bound_recv_type; 1482 if (receiver != NULL) bound_recv_type = KlassHandle(THREAD, receiver->klass()); 1483 verify_method_type(m, mtype, true, bound_recv_type, CHECK); 1484 1485 int receiver_pos = m->size_of_parameters() - 1; 1486 1487 // Verify MH.vmargslot, which should point at the bound receiver. 1488 verify_vmargslot(mh, -1, sun_dyn_BoundMethodHandle::vmargslot(mh()), CHECK); 1489 //verify_vmslots(mh, CHECK); 1490 1491 // Verify vmslots. 1492 if (java_dyn_MethodHandle::vmslots(mh()) != receiver_pos) { 1493 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH (receiver)"); 1494 } 1495 } 1496 1497 // Initialize a BMH with a receiver bound directly to a methodOop. 1498 void MethodHandles::init_BoundMethodHandle_with_receiver(Handle mh, 1499 methodHandle original_m, 1500 KlassHandle receiver_limit, 1501 int decode_flags, 1502 TRAPS) { 1503 // Check arguments. 1504 if (mh.is_null() || original_m.is_null()) { 1505 THROW(vmSymbols::java_lang_InternalError()); 1506 } 1507 1508 KlassHandle receiver_klass; 1509 { 1510 oop receiver_oop = sun_dyn_BoundMethodHandle::argument(mh()); 1511 if (receiver_oop != NULL) 1512 receiver_klass = KlassHandle(THREAD, receiver_oop->klass()); 1513 } 1514 methodHandle m = dispatch_decoded_method(original_m, 1515 receiver_limit, decode_flags, 1516 receiver_klass, 1517 CHECK); 1518 if (m.is_null()) { THROW(vmSymbols::java_lang_InternalError()); } 1519 if (m->is_abstract()) { THROW(vmSymbols::java_lang_AbstractMethodError()); } 1520 1521 java_dyn_MethodHandle::init_vmslots(mh()); 1522 1523 if (VerifyMethodHandles) { 1524 verify_BoundMethodHandle_with_receiver(mh, m, CHECK); 1525 } 1526 1527 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), m()); 1528 1529 DEBUG_ONLY(int junk; klassOop junk2); 1530 assert(MethodHandles::decode_method(mh(), junk2, junk) == m(), "properly stored for later decoding"); 1531 assert(decode_MethodHandle_stack_pushes(mh()) == 1, "BMH pushes one stack slot"); 1532 1533 // Done! 1534 java_dyn_MethodHandle::set_vmentry(mh(), MethodHandles::entry(MethodHandles::_bound_ref_direct_mh)); 1535 } 1536 1537 void MethodHandles::verify_BoundMethodHandle(Handle mh, Handle target, int argnum, 1538 bool direct_to_method, TRAPS) { 1539 Handle ptype_handle(THREAD, 1540 java_dyn_MethodType::ptype(java_dyn_MethodHandle::type(target()), argnum)); 1541 KlassHandle ptype_klass; 1542 BasicType ptype = java_lang_Class::as_BasicType(ptype_handle(), &ptype_klass); 1543 int slots_pushed = type2size[ptype]; 1544 1545 oop argument = sun_dyn_BoundMethodHandle::argument(mh()); 1546 1547 const char* err = NULL; 1548 1549 switch (ptype) { 1550 case T_OBJECT: 1551 if (argument != NULL) 1552 // we must implicitly convert from the arg type to the outgoing ptype 1553 err = check_argument_type_change(T_OBJECT, argument->klass(), ptype, ptype_klass(), argnum); 1554 break; 1555 1556 case T_ARRAY: case T_VOID: 1557 assert(false, "array, void do not appear here"); 1558 default: 1559 if (ptype != T_INT && !is_subword_type(ptype)) { 1560 err = "unexpected parameter type"; 1561 break; 1562 } 1563 // check subrange of Integer.value, if necessary 1564 if (argument == NULL || argument->klass() != SystemDictionary::Integer_klass()) { 1565 err = "bound integer argument must be of type java.lang.Integer"; 1566 break; 1567 } 1568 if (ptype != T_INT) { 1569 int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_INT); 1570 jint value = argument->int_field(value_offset); 1571 int vminfo = adapter_unbox_subword_vminfo(ptype); 1572 jint subword = truncate_subword_from_vminfo(value, vminfo); 1573 if (value != subword) { 1574 err = "bound subword value does not fit into the subword type"; 1575 break; 1576 } 1577 } 1578 break; 1579 case T_FLOAT: 1580 case T_DOUBLE: 1581 case T_LONG: 1582 { 1583 // we must implicitly convert from the unboxed arg type to the outgoing ptype 1584 BasicType argbox = java_lang_boxing_object::basic_type(argument); 1585 if (argbox != ptype) { 1586 err = check_argument_type_change(T_OBJECT, (argument == NULL 1587 ? SystemDictionary::Object_klass() 1588 : argument->klass()), 1589 ptype, ptype_klass(), argnum); 1590 assert(err != NULL, "this must be an error"); 1591 } 1592 break; 1593 } 1594 } 1595 1596 if (err == NULL) { 1597 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh())); 1598 if (direct_to_method) { 1599 assert(this_pushes == slots_pushed, "BMH pushes one or two stack slots"); 1600 assert(slots_pushed <= MethodHandlePushLimit, ""); 1601 } else { 1602 int target_pushes = decode_MethodHandle_stack_pushes(target()); 1603 assert(this_pushes == slots_pushed + target_pushes, "BMH stack motion must be correct"); 1604 // do not blow the stack; use a Java-based adapter if this limit is exceeded 1605 // FIXME 1606 // if (slots_pushed + target_pushes > MethodHandlePushLimit) 1607 // err = "too many bound parameters"; 1608 } 1609 } 1610 1611 if (err == NULL) { 1612 // Verify the rest of the method type. 1613 err = check_method_type_insertion(java_dyn_MethodHandle::type(mh()), 1614 argnum, ptype_handle(), 1615 java_dyn_MethodHandle::type(target())); 1616 } 1617 1618 if (err != NULL) { 1619 THROW_MSG(vmSymbols::java_lang_InternalError(), err); 1620 } 1621 } 1622 1623 void MethodHandles::init_BoundMethodHandle(Handle mh, Handle target, int argnum, TRAPS) { 1624 // Check arguments. 1625 if (mh.is_null() || target.is_null() || !java_dyn_MethodHandle::is_instance(target())) { 1626 THROW(vmSymbols::java_lang_InternalError()); 1627 } 1628 1629 java_dyn_MethodHandle::init_vmslots(mh()); 1630 1631 if (VerifyMethodHandles) { 1632 int insert_after = argnum - 1; 1633 verify_vmargslot(mh, insert_after, sun_dyn_BoundMethodHandle::vmargslot(mh()), CHECK); 1634 verify_vmslots(mh, CHECK); 1635 } 1636 1637 // Get bound type and required slots. 1638 oop ptype_oop = java_dyn_MethodType::ptype(java_dyn_MethodHandle::type(target()), argnum); 1639 BasicType ptype = java_lang_Class::as_BasicType(ptype_oop); 1640 int slots_pushed = type2size[ptype]; 1641 1642 // If (a) the target is a direct non-dispatched method handle, 1643 // or (b) the target is a dispatched direct method handle and we 1644 // are binding the receiver, cut out the middle-man. 1645 // Do this by decoding the DMH and using its methodOop directly as vmtarget. 1646 bool direct_to_method = false; 1647 if (OptimizeMethodHandles && 1648 target->klass() == SystemDictionary::DirectMethodHandle_klass() && 1649 (argnum == 0 || sun_dyn_DirectMethodHandle::vmindex(target()) < 0)) { 1650 int decode_flags = 0; klassOop receiver_limit_oop = NULL; 1651 methodHandle m(THREAD, decode_method(target(), receiver_limit_oop, decode_flags)); 1652 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "DMH failed to decode"); } 1653 DEBUG_ONLY(int m_vmslots = m->size_of_parameters() - slots_pushed); // pos. of 1st arg. 1654 assert(sun_dyn_BoundMethodHandle::vmslots(mh()) == m_vmslots, "type w/ m sig"); 1655 if (argnum == 0 && (decode_flags & _dmf_has_receiver) != 0) { 1656 KlassHandle receiver_limit(THREAD, receiver_limit_oop); 1657 init_BoundMethodHandle_with_receiver(mh, m, 1658 receiver_limit, decode_flags, 1659 CHECK); 1660 return; 1661 } 1662 1663 // Even if it is not a bound receiver, we still might be able 1664 // to bind another argument and still invoke the methodOop directly. 1665 if (!(decode_flags & _dmf_does_dispatch)) { 1666 direct_to_method = true; 1667 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), m()); 1668 } 1669 } 1670 if (!direct_to_method) 1671 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), target()); 1672 1673 if (VerifyMethodHandles) { 1674 verify_BoundMethodHandle(mh, target, argnum, direct_to_method, CHECK); 1675 } 1676 1677 // Next question: Is this a ref, int, or long bound value? 1678 MethodHandleEntry* me = NULL; 1679 if (ptype == T_OBJECT) { 1680 if (direct_to_method) me = MethodHandles::entry(_bound_ref_direct_mh); 1681 else me = MethodHandles::entry(_bound_ref_mh); 1682 } else if (slots_pushed == 2) { 1683 if (direct_to_method) me = MethodHandles::entry(_bound_long_direct_mh); 1684 else me = MethodHandles::entry(_bound_long_mh); 1685 } else if (slots_pushed == 1) { 1686 if (direct_to_method) me = MethodHandles::entry(_bound_int_direct_mh); 1687 else me = MethodHandles::entry(_bound_int_mh); 1688 } else { 1689 assert(false, ""); 1690 } 1691 1692 // Done! 1693 java_dyn_MethodHandle::set_vmentry(mh(), me); 1694 } 1695 1696 static void throw_InternalError_for_bad_conversion(int conversion, const char* err, TRAPS) { 1697 char msg[200]; 1698 jio_snprintf(msg, sizeof(msg), "bad adapter (conversion=0x%08x): %s", conversion, err); 1699 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), msg); 1700 } 1701 1702 void MethodHandles::verify_AdapterMethodHandle(Handle mh, int argnum, TRAPS) { 1703 jint conversion = sun_dyn_AdapterMethodHandle::conversion(mh()); 1704 int argslot = sun_dyn_AdapterMethodHandle::vmargslot(mh()); 1705 1706 verify_vmargslot(mh, argnum, argslot, CHECK); 1707 verify_vmslots(mh, CHECK); 1708 1709 jint conv_op = adapter_conversion_op(conversion); 1710 if (!conv_op_valid(conv_op)) { 1711 throw_InternalError_for_bad_conversion(conversion, "unknown conversion op", THREAD); 1712 return; 1713 } 1714 EntryKind ek = adapter_entry_kind(conv_op); 1715 1716 int stack_move = adapter_conversion_stack_move(conversion); 1717 BasicType src = adapter_conversion_src_type(conversion); 1718 BasicType dest = adapter_conversion_dest_type(conversion); 1719 int vminfo = adapter_conversion_vminfo(conversion); // should be zero 1720 1721 Handle argument(THREAD, sun_dyn_AdapterMethodHandle::argument(mh())); 1722 Handle target(THREAD, sun_dyn_AdapterMethodHandle::vmtarget(mh())); 1723 Handle src_mtype(THREAD, java_dyn_MethodHandle::type(mh())); 1724 Handle dst_mtype(THREAD, java_dyn_MethodHandle::type(target())); 1725 1726 const char* err = NULL; 1727 1728 if (err == NULL) { 1729 // Check that the correct argument is supplied, but only if it is required. 1730 switch (ek) { 1731 case _adapter_check_cast: // target type of cast 1732 case _adapter_ref_to_prim: // wrapper type from which to unbox 1733 case _adapter_prim_to_ref: // wrapper type to box into 1734 case _adapter_collect_args: // array type to collect into 1735 case _adapter_spread_args: // array type to spread from 1736 if (!java_lang_Class::is_instance(argument()) 1737 || java_lang_Class::is_primitive(argument())) 1738 { err = "adapter requires argument of type java.lang.Class"; break; } 1739 if (ek == _adapter_collect_args || 1740 ek == _adapter_spread_args) { 1741 // Make sure it is a suitable collection type. (Array, for now.) 1742 Klass* ak = Klass::cast(java_lang_Class::as_klassOop(argument())); 1743 if (!ak->oop_is_objArray()) { 1744 { err = "adapter requires argument of type java.lang.Class<Object[]>"; break; } 1745 } 1746 } 1747 break; 1748 case _adapter_flyby: 1749 case _adapter_ricochet: 1750 if (!java_dyn_MethodHandle::is_instance(argument())) 1751 { err = "MethodHandle adapter argument required"; break; } 1752 break; 1753 default: 1754 if (argument.not_null()) 1755 { err = "adapter has spurious argument"; break; } 1756 break; 1757 } 1758 } 1759 1760 if (err == NULL) { 1761 // Check that the src/dest types are supplied if needed. 1762 switch (ek) { 1763 case _adapter_check_cast: 1764 if (src != T_OBJECT || dest != T_OBJECT) { 1765 err = "adapter requires object src/dest conversion subfields"; 1766 } 1767 break; 1768 case _adapter_prim_to_prim: 1769 if (!is_java_primitive(src) || !is_java_primitive(dest) || src == dest) { 1770 err = "adapter requires primitive src/dest conversion subfields"; break; 1771 } 1772 if ( (src == T_FLOAT || src == T_DOUBLE) && !(dest == T_FLOAT || dest == T_DOUBLE) || 1773 !(src == T_FLOAT || src == T_DOUBLE) && (dest == T_FLOAT || dest == T_DOUBLE)) { 1774 err = "adapter cannot convert beween floating and fixed-point"; break; 1775 } 1776 break; 1777 case _adapter_ref_to_prim: 1778 if (src != T_OBJECT || !is_java_primitive(dest) 1779 || argument() != Klass::cast(SystemDictionary::box_klass(dest))->java_mirror()) { 1780 err = "adapter requires primitive dest conversion subfield"; break; 1781 } 1782 break; 1783 case _adapter_prim_to_ref: 1784 if (!is_java_primitive(src) || dest != T_OBJECT 1785 || argument() != Klass::cast(SystemDictionary::box_klass(src))->java_mirror()) { 1786 err = "adapter requires primitive src conversion subfield"; break; 1787 } 1788 break; 1789 case _adapter_swap_args: 1790 case _adapter_rot_args: 1791 { 1792 if (!src || src != dest) { 1793 err = "adapter requires src/dest conversion subfields for swap"; break; 1794 } 1795 int swap_size = type2size[src]; 1796 oop src_mtype = sun_dyn_AdapterMethodHandle::type(mh()); 1797 oop dest_mtype = sun_dyn_AdapterMethodHandle::type(target()); 1798 int slot_limit = sun_dyn_AdapterMethodHandle::vmslots(target()); 1799 int src_slot = argslot; 1800 int dest_slot = vminfo; 1801 bool rotate_up = (src_slot > dest_slot); // upward rotation 1802 int src_arg = argnum; 1803 int dest_arg = argument_slot_to_argnum(dest_mtype, dest_slot); 1804 verify_vmargslot(mh, dest_arg, dest_slot, CHECK); 1805 if (!(dest_slot >= src_slot + swap_size) && 1806 !(src_slot >= dest_slot + swap_size)) { 1807 err = "source, destination slots must be distinct"; 1808 } else if (ek == _adapter_swap_args && !(src_slot > dest_slot)) { 1809 err = "source of swap must be deeper in stack"; 1810 } else if (ek == _adapter_swap_args) { 1811 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, dest_arg), 1812 java_dyn_MethodType::ptype(dest_mtype, src_arg), 1813 dest_arg); 1814 } else if (ek == _adapter_rot_args) { 1815 if (rotate_up) { 1816 assert((src_slot > dest_slot) && (src_arg < dest_arg), ""); 1817 // rotate up: [dest_slot..src_slot-ss] --> [dest_slot+ss..src_slot] 1818 // that is: [src_arg+1..dest_arg] --> [src_arg..dest_arg-1] 1819 for (int i = src_arg+1; i <= dest_arg && err == NULL; i++) { 1820 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, i), 1821 java_dyn_MethodType::ptype(dest_mtype, i-1), 1822 i); 1823 } 1824 } else { // rotate down 1825 assert((src_slot < dest_slot) && (src_arg > dest_arg), ""); 1826 // rotate down: [src_slot+ss..dest_slot] --> [src_slot..dest_slot-ss] 1827 // that is: [dest_arg..src_arg-1] --> [dst_arg+1..src_arg] 1828 for (int i = dest_arg; i <= src_arg-1 && err == NULL; i++) { 1829 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, i), 1830 java_dyn_MethodType::ptype(dest_mtype, i+1), 1831 i); 1832 } 1833 } 1834 } 1835 if (err == NULL) 1836 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, src_arg), 1837 java_dyn_MethodType::ptype(dest_mtype, dest_arg), 1838 src_arg); 1839 } 1840 break; 1841 case _adapter_collect_args: 1842 case _adapter_spread_args: 1843 { 1844 BasicType coll_type = (ek == _adapter_collect_args) ? dest : src; 1845 BasicType elem_type = (ek == _adapter_collect_args) ? src : dest; 1846 if (coll_type != T_OBJECT || elem_type != T_OBJECT) { 1847 err = "adapter requires src/dest subfields"; break; 1848 // later: 1849 // - consider making coll be a primitive array 1850 // - consider making coll be a heterogeneous collection 1851 } 1852 } 1853 break; 1854 default: 1855 if (src != 0 || dest != 0) { 1856 err = "adapter has spurious src/dest conversion subfields"; break; 1857 } 1858 break; 1859 } 1860 } 1861 1862 if (err == NULL) { 1863 // Check the stack_move subfield. 1864 // It must always report the net change in stack size, positive or negative. 1865 int slots_pushed = stack_move / stack_move_unit(); 1866 switch (ek) { 1867 case _adapter_prim_to_prim: 1868 case _adapter_ref_to_prim: 1869 case _adapter_prim_to_ref: 1870 if (slots_pushed != type2size[dest] - type2size[src]) { 1871 err = "wrong stack motion for primitive conversion"; 1872 } 1873 break; 1874 case _adapter_dup_args: 1875 if (slots_pushed <= 0) { 1876 err = "adapter requires conversion subfield slots_pushed > 0"; 1877 } 1878 break; 1879 case _adapter_drop_args: 1880 if (slots_pushed >= 0) { 1881 err = "adapter requires conversion subfield slots_pushed < 0"; 1882 } 1883 break; 1884 case _adapter_collect_args: 1885 if (slots_pushed > 1) { 1886 err = "adapter requires conversion subfield slots_pushed <= 1"; 1887 } 1888 break; 1889 case _adapter_spread_args: 1890 if (slots_pushed < -1) { 1891 err = "adapter requires conversion subfield slots_pushed >= -1"; 1892 } 1893 break; 1894 default: 1895 if (stack_move != 0) { 1896 err = "adapter has spurious stack_move conversion subfield"; 1897 } 1898 break; 1899 } 1900 if (err == NULL && stack_move != slots_pushed * stack_move_unit()) { 1901 err = "stack_move conversion subfield must be multiple of stack_move_unit"; 1902 } 1903 } 1904 1905 if (err == NULL) { 1906 // Make sure this adapter does not push too deeply. 1907 int slots_pushed = stack_move / stack_move_unit(); 1908 int this_vmslots = java_dyn_MethodHandle::vmslots(mh()); 1909 int target_vmslots = java_dyn_MethodHandle::vmslots(target()); 1910 if (slots_pushed != (target_vmslots - this_vmslots)) { 1911 err = "stack_move inconsistent with previous and current MethodType vmslots"; 1912 } else if (slots_pushed > 0) { 1913 // verify stack_move against MethodHandlePushLimit 1914 int target_pushes = decode_MethodHandle_stack_pushes(target()); 1915 // do not blow the stack; use a Java-based adapter if this limit is exceeded 1916 if (slots_pushed + target_pushes > MethodHandlePushLimit) { 1917 err = "adapter pushes too many parameters"; 1918 } 1919 } 1920 1921 // While we're at it, check that the stack motion decoder works: 1922 DEBUG_ONLY(int target_pushes = decode_MethodHandle_stack_pushes(target())); 1923 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh())); 1924 assert(this_pushes == slots_pushed + target_pushes, "AMH stack motion must be correct"); 1925 } 1926 1927 if (err == NULL && vminfo != 0) { 1928 switch (ek) { 1929 case _adapter_swap_args: 1930 case _adapter_rot_args: 1931 break; // OK 1932 default: 1933 err = "vminfo subfield is reserved to the JVM"; 1934 } 1935 } 1936 1937 // Do additional ad hoc checks. 1938 if (err == NULL) { 1939 switch (ek) { 1940 case _adapter_retype_only: 1941 err = check_method_type_passthrough(src_mtype(), dst_mtype(), false); 1942 break; 1943 1944 case _adapter_retype_raw: 1945 err = check_method_type_passthrough(src_mtype(), dst_mtype(), true); 1946 break; 1947 1948 case _adapter_check_cast: 1949 { 1950 // The actual value being checked must be a reference: 1951 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype(), argnum), 1952 object_java_mirror(), argnum); 1953 if (err != NULL) break; 1954 1955 // The output of the cast must fit with the destination argument: 1956 Handle cast_class = argument; 1957 err = check_method_type_conversion(src_mtype(), 1958 argnum, cast_class(), 1959 dst_mtype()); 1960 } 1961 break; 1962 1963 // %%% TO DO: continue in remaining cases to verify src/dst_mtype if VerifyMethodHandles 1964 } 1965 } 1966 1967 if (err != NULL) { 1968 throw_InternalError_for_bad_conversion(conversion, err, THREAD); 1969 return; 1970 } 1971 1972 } 1973 1974 void MethodHandles::init_AdapterMethodHandle(Handle mh, Handle target, int argnum, TRAPS) { 1975 oop argument = sun_dyn_AdapterMethodHandle::argument(mh()); 1976 int argslot = sun_dyn_AdapterMethodHandle::vmargslot(mh()); 1977 jint conversion = sun_dyn_AdapterMethodHandle::conversion(mh()); 1978 jint conv_op = adapter_conversion_op(conversion); 1979 1980 // adjust the adapter code to the internal EntryKind enumeration: 1981 EntryKind ek_orig = adapter_entry_kind(conv_op); 1982 EntryKind ek_opt = ek_orig; // may be optimized 1983 1984 // Finalize the vmtarget field (Java initialized it to null). 1985 if (!java_dyn_MethodHandle::is_instance(target())) { 1986 throw_InternalError_for_bad_conversion(conversion, "bad target", THREAD); 1987 return; 1988 } 1989 sun_dyn_AdapterMethodHandle::set_vmtarget(mh(), target()); 1990 1991 if (VerifyMethodHandles) { 1992 verify_AdapterMethodHandle(mh, argnum, CHECK); 1993 } 1994 1995 int stack_move = adapter_conversion_stack_move(conversion); 1996 BasicType src = adapter_conversion_src_type(conversion); 1997 BasicType dest = adapter_conversion_dest_type(conversion); 1998 int vminfo = adapter_conversion_vminfo(conversion); // should be zero 1999 2000 const char* err = NULL; 2001 2002 // Now it's time to finish the case analysis and pick a MethodHandleEntry. 2003 switch (ek_orig) { 2004 case _adapter_retype_only: 2005 case _adapter_retype_raw: 2006 case _adapter_check_cast: 2007 case _adapter_dup_args: 2008 case _adapter_drop_args: 2009 // these work fine via general case code 2010 break; 2011 2012 case _adapter_prim_to_prim: 2013 { 2014 // Non-subword cases are {int,float,long,double} -> {int,float,long,double}. 2015 // And, the {float,double} -> {int,long} cases must be handled by Java. 2016 switch (type2size[src] *4+ type2size[dest]) { 2017 case 1 *4+ 1: 2018 assert(src == T_INT || is_subword_type(src), "source is not float"); 2019 // Subword-related cases are int -> {boolean,byte,char,short}. 2020 ek_opt = _adapter_opt_i2i; 2021 vminfo = adapter_prim_to_prim_subword_vminfo(dest); 2022 break; 2023 case 2 *4+ 1: 2024 if (src == T_LONG && (dest == T_INT || is_subword_type(dest))) { 2025 ek_opt = _adapter_opt_l2i; 2026 vminfo = adapter_prim_to_prim_subword_vminfo(dest); 2027 } else if (src == T_DOUBLE && dest == T_FLOAT) { 2028 ek_opt = _adapter_opt_d2f; 2029 } else { 2030 assert(false, ""); 2031 } 2032 break; 2033 case 1 *4+ 2: 2034 if (src == T_INT && dest == T_LONG) { 2035 ek_opt = _adapter_opt_i2l; 2036 } else if (src == T_FLOAT && dest == T_DOUBLE) { 2037 ek_opt = _adapter_opt_f2d; 2038 } else { 2039 assert(false, ""); 2040 } 2041 break; 2042 default: 2043 assert(false, ""); 2044 break; 2045 } 2046 } 2047 break; 2048 2049 case _adapter_ref_to_prim: 2050 { 2051 switch (type2size[dest]) { 2052 case 1: 2053 ek_opt = _adapter_opt_unboxi; 2054 vminfo = adapter_unbox_subword_vminfo(dest); 2055 break; 2056 case 2: 2057 ek_opt = _adapter_opt_unboxl; 2058 break; 2059 default: 2060 assert(false, ""); 2061 break; 2062 } 2063 } 2064 break; 2065 2066 case _adapter_prim_to_ref: 2067 goto throw_not_impl; // allocates, hence could block 2068 2069 case _adapter_swap_args: 2070 case _adapter_rot_args: 2071 { 2072 int swap_slots = type2size[src]; 2073 int slot_limit = sun_dyn_AdapterMethodHandle::vmslots(mh()); 2074 int src_slot = argslot; 2075 int dest_slot = vminfo; 2076 int rotate = (ek_orig == _adapter_swap_args) ? 0 : (src_slot > dest_slot) ? 1 : -1; 2077 switch (swap_slots) { 2078 case 1: 2079 ek_opt = (!rotate ? _adapter_opt_swap_1 : 2080 rotate > 0 ? _adapter_opt_rot_1_up : _adapter_opt_rot_1_down); 2081 break; 2082 case 2: 2083 ek_opt = (!rotate ? _adapter_opt_swap_2 : 2084 rotate > 0 ? _adapter_opt_rot_2_up : _adapter_opt_rot_2_down); 2085 break; 2086 default: 2087 assert(false, ""); 2088 break; 2089 } 2090 } 2091 break; 2092 2093 case _adapter_collect_args: 2094 goto throw_not_impl; // allocates, hence could block 2095 2096 case _adapter_spread_args: 2097 { 2098 // vminfo will be the required length of the array 2099 int slots_pushed = stack_move / stack_move_unit(); 2100 int array_size = slots_pushed + 1; 2101 assert(array_size >= 0, ""); 2102 vminfo = array_size; 2103 switch (array_size) { 2104 case 0: ek_opt = _adapter_opt_spread_0; break; 2105 case 1: ek_opt = _adapter_opt_spread_1; break; 2106 default: ek_opt = _adapter_opt_spread_more; break; 2107 } 2108 if ((vminfo & CONV_VMINFO_MASK) != vminfo) 2109 goto throw_not_impl; // overflow 2110 } 2111 break; 2112 2113 case _adapter_flyby: 2114 case _adapter_ricochet: 2115 goto throw_not_impl; // runs Java code, hence could block 2116 2117 default: 2118 // should have failed much earlier; must be a missing case here 2119 assert(false, "incomplete switch"); 2120 // and fall through: 2121 2122 throw_not_impl: 2123 // FIXME: these adapters are NYI 2124 err = "adapter not yet implemented in the JVM"; 2125 break; 2126 } 2127 2128 if (err != NULL) { 2129 throw_InternalError_for_bad_conversion(conversion, err, THREAD); 2130 return; 2131 } 2132 2133 // Rebuild the conversion value; maybe parts of it were changed. 2134 jint new_conversion = adapter_conversion(conv_op, src, dest, stack_move, vminfo); 2135 2136 // Finalize the conversion field. (Note that it is final to Java code.) 2137 sun_dyn_AdapterMethodHandle::set_conversion(mh(), new_conversion); 2138 2139 // Done! 2140 java_dyn_MethodHandle::set_vmentry(mh(), entry(ek_opt)); 2141 2142 // There should be enough memory barriers on exit from native methods 2143 // to ensure that the MH is fully initialized to all threads before 2144 // Java code can publish it in global data structures. 2145 } 2146 2147 // 2148 // Here are the native methods on sun.dyn.MethodHandleImpl. 2149 // They are the private interface between this JVM and the HotSpot-specific 2150 // Java code that implements JSR 292 method handles. 2151 // 2152 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way 2153 // that intrinsic (non-JNI) native methods are defined in HotSpot. 2154 // 2155 2156 // direct method handles for invokestatic or invokespecial 2157 // void init(DirectMethodHandle self, MemberName ref, boolean doDispatch, Class<?> caller); 2158 JVM_ENTRY(void, MHI_init_DMH(JNIEnv *env, jobject igcls, jobject mh_jh, 2159 jobject target_jh, jboolean do_dispatch, jobject caller_jh)) { 2160 ResourceMark rm; // for error messages 2161 2162 // This is the guy we are initializing: 2163 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } 2164 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); 2165 2166 // Early returns out of this method leave the DMH in an unfinished state. 2167 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); 2168 2169 // which method are we really talking about? 2170 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } 2171 oop target_oop = JNIHandles::resolve_non_null(target_jh); 2172 if (sun_dyn_MemberName::is_instance(target_oop) && 2173 sun_dyn_MemberName::vmindex(target_oop) == VM_INDEX_UNINITIALIZED) { 2174 Handle mname(THREAD, target_oop); 2175 MethodHandles::resolve_MemberName(mname, CHECK); 2176 target_oop = mname(); // in case of GC 2177 } 2178 2179 int decode_flags = 0; klassOop receiver_limit = NULL; 2180 methodHandle m(THREAD, 2181 MethodHandles::decode_method(target_oop, 2182 receiver_limit, decode_flags)); 2183 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "no such method"); } 2184 2185 // The trusted Java code that calls this method should already have performed 2186 // access checks on behalf of the given caller. But, we can verify this. 2187 if (VerifyMethodHandles && caller_jh != NULL) { 2188 KlassHandle caller(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh))); 2189 // If this were a bytecode, the first access check would be against 2190 // the "reference class" mentioned in the CONSTANT_Methodref. 2191 // We don't know at this point which class that was, and if we 2192 // check against m.method_holder we might get the wrong answer. 2193 // So we just make sure to handle this check when the resolution 2194 // happens, when we call resolve_MemberName. 2195 // 2196 // (A public class can inherit public members from private supers, 2197 // and it would be wrong to check access against the private super 2198 // if the original symbolic reference was against the public class.) 2199 // 2200 // If there were a bytecode, the next step would be to lookup the method 2201 // in the reference class, then then check the method's access bits. 2202 // Emulate LinkResolver::check_method_accessability. 2203 klassOop resolved_klass = m->method_holder(); 2204 if (!Reflection::verify_field_access(caller->as_klassOop(), 2205 resolved_klass, resolved_klass, 2206 m->access_flags(), 2207 true)) { 2208 // %%% following cutout belongs in Reflection::verify_field_access? 2209 bool same_pm = Reflection::is_same_package_member(caller->as_klassOop(), 2210 resolved_klass, THREAD); 2211 if (!same_pm) { 2212 THROW_MSG(vmSymbols::java_lang_InternalError(), m->name_and_sig_as_C_string()); 2213 } 2214 } 2215 } 2216 2217 MethodHandles::init_DirectMethodHandle(mh, m, (do_dispatch != JNI_FALSE), CHECK); 2218 } 2219 JVM_END 2220 2221 // bound method handles 2222 JVM_ENTRY(void, MHI_init_BMH(JNIEnv *env, jobject igcls, jobject mh_jh, 2223 jobject target_jh, int argnum)) { 2224 ResourceMark rm; // for error messages 2225 2226 // This is the guy we are initializing: 2227 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } 2228 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); 2229 2230 // Early returns out of this method leave the BMH in an unfinished state. 2231 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); 2232 2233 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } 2234 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); 2235 2236 if (!java_dyn_MethodHandle::is_instance(target())) { 2237 // Target object is a reflective method. (%%% Do we need this alternate path?) 2238 Untested("init_BMH of non-MH"); 2239 if (argnum != 0) { THROW(vmSymbols::java_lang_InternalError()); } 2240 int decode_flags = 0; klassOop receiver_limit_oop = NULL; 2241 methodHandle m(THREAD, 2242 MethodHandles::decode_method(target(), 2243 receiver_limit_oop, 2244 decode_flags)); 2245 KlassHandle receiver_limit(THREAD, receiver_limit_oop); 2246 MethodHandles::init_BoundMethodHandle_with_receiver(mh, m, 2247 receiver_limit, 2248 decode_flags, 2249 CHECK); 2250 return; 2251 } 2252 2253 // Build a BMH on top of a DMH or another BMH: 2254 MethodHandles::init_BoundMethodHandle(mh, target, argnum, CHECK); 2255 } 2256 JVM_END 2257 2258 // adapter method handles 2259 JVM_ENTRY(void, MHI_init_AMH(JNIEnv *env, jobject igcls, jobject mh_jh, 2260 jobject target_jh, int argnum)) { 2261 // This is the guy we are initializing: 2262 if (mh_jh == NULL || target_jh == NULL) { 2263 THROW(vmSymbols::java_lang_InternalError()); 2264 } 2265 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); 2266 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); 2267 2268 // Early returns out of this method leave the AMH in an unfinished state. 2269 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); 2270 2271 MethodHandles::init_AdapterMethodHandle(mh, target, argnum, CHECK); 2272 } 2273 JVM_END 2274 2275 // method type forms 2276 JVM_ENTRY(void, MHI_init_MT(JNIEnv *env, jobject igcls, jobject erased_jh)) { 2277 if (erased_jh == NULL) return; 2278 if (TraceMethodHandles) { 2279 tty->print("creating MethodType form "); 2280 if (WizardMode || Verbose) { // Warning: this calls Java code on the MH! 2281 // call Object.toString() 2282 symbolOop name = vmSymbols::toString_name(), sig = vmSymbols::void_string_signature(); 2283 JavaCallArguments args(Handle(THREAD, JNIHandles::resolve_non_null(erased_jh))); 2284 JavaValue result(T_OBJECT); 2285 JavaCalls::call_virtual(&result, SystemDictionary::Object_klass(), name, sig, 2286 &args, CHECK); 2287 Handle str(THREAD, (oop)result.get_jobject()); 2288 java_lang_String::print(str, tty); 2289 } 2290 tty->cr(); 2291 } 2292 } 2293 JVM_END 2294 2295 // debugging and reflection 2296 JVM_ENTRY(jobject, MHI_getTarget(JNIEnv *env, jobject igcls, jobject mh_jh, jint format)) { 2297 Handle mh(THREAD, JNIHandles::resolve(mh_jh)); 2298 if (!java_dyn_MethodHandle::is_instance(mh())) { 2299 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); 2300 } 2301 oop target = MethodHandles::encode_target(mh, format, CHECK_NULL); 2302 return JNIHandles::make_local(THREAD, target); 2303 } 2304 JVM_END 2305 2306 JVM_ENTRY(jint, MHI_getConstant(JNIEnv *env, jobject igcls, jint which)) { 2307 switch (which) { 2308 case MethodHandles::GC_JVM_PUSH_LIMIT: 2309 guarantee(MethodHandlePushLimit >= 2 && MethodHandlePushLimit <= 0xFF, 2310 "MethodHandlePushLimit parameter must be in valid range"); 2311 return MethodHandlePushLimit; 2312 case MethodHandles::GC_JVM_STACK_MOVE_UNIT: 2313 // return number of words per slot, signed according to stack direction 2314 return MethodHandles::stack_move_unit(); 2315 case MethodHandles::GC_CONV_OP_IMPLEMENTED_MASK: 2316 return MethodHandles::adapter_conversion_ops_supported_mask(); 2317 } 2318 return 0; 2319 } 2320 JVM_END 2321 2322 #ifndef PRODUCT 2323 #define EACH_NAMED_CON(template) \ 2324 template(MethodHandles,GC_JVM_PUSH_LIMIT) \ 2325 template(MethodHandles,GC_JVM_STACK_MOVE_UNIT) \ 2326 template(MethodHandles,ETF_HANDLE_OR_METHOD_NAME) \ 2327 template(MethodHandles,ETF_DIRECT_HANDLE) \ 2328 template(MethodHandles,ETF_METHOD_NAME) \ 2329 template(MethodHandles,ETF_REFLECT_METHOD) \ 2330 template(sun_dyn_MemberName,MN_IS_METHOD) \ 2331 template(sun_dyn_MemberName,MN_IS_CONSTRUCTOR) \ 2332 template(sun_dyn_MemberName,MN_IS_FIELD) \ 2333 template(sun_dyn_MemberName,MN_IS_TYPE) \ 2334 template(sun_dyn_MemberName,MN_SEARCH_SUPERCLASSES) \ 2335 template(sun_dyn_MemberName,MN_SEARCH_INTERFACES) \ 2336 template(sun_dyn_MemberName,VM_INDEX_UNINITIALIZED) \ 2337 template(sun_dyn_AdapterMethodHandle,OP_RETYPE_ONLY) \ 2338 template(sun_dyn_AdapterMethodHandle,OP_RETYPE_RAW) \ 2339 template(sun_dyn_AdapterMethodHandle,OP_CHECK_CAST) \ 2340 template(sun_dyn_AdapterMethodHandle,OP_PRIM_TO_PRIM) \ 2341 template(sun_dyn_AdapterMethodHandle,OP_REF_TO_PRIM) \ 2342 template(sun_dyn_AdapterMethodHandle,OP_PRIM_TO_REF) \ 2343 template(sun_dyn_AdapterMethodHandle,OP_SWAP_ARGS) \ 2344 template(sun_dyn_AdapterMethodHandle,OP_ROT_ARGS) \ 2345 template(sun_dyn_AdapterMethodHandle,OP_DUP_ARGS) \ 2346 template(sun_dyn_AdapterMethodHandle,OP_DROP_ARGS) \ 2347 template(sun_dyn_AdapterMethodHandle,OP_COLLECT_ARGS) \ 2348 template(sun_dyn_AdapterMethodHandle,OP_SPREAD_ARGS) \ 2349 template(sun_dyn_AdapterMethodHandle,OP_FLYBY) \ 2350 template(sun_dyn_AdapterMethodHandle,OP_RICOCHET) \ 2351 template(sun_dyn_AdapterMethodHandle,CONV_OP_LIMIT) \ 2352 template(sun_dyn_AdapterMethodHandle,CONV_OP_MASK) \ 2353 template(sun_dyn_AdapterMethodHandle,CONV_VMINFO_MASK) \ 2354 template(sun_dyn_AdapterMethodHandle,CONV_VMINFO_SHIFT) \ 2355 template(sun_dyn_AdapterMethodHandle,CONV_OP_SHIFT) \ 2356 template(sun_dyn_AdapterMethodHandle,CONV_DEST_TYPE_SHIFT) \ 2357 template(sun_dyn_AdapterMethodHandle,CONV_SRC_TYPE_SHIFT) \ 2358 template(sun_dyn_AdapterMethodHandle,CONV_STACK_MOVE_SHIFT) \ 2359 template(sun_dyn_AdapterMethodHandle,CONV_STACK_MOVE_MASK) \ 2360 /*end*/ 2361 2362 #define ONE_PLUS(scope,value) 1+ 2363 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS) 0; 2364 #define VALUE_COMMA(scope,value) scope::value, 2365 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA) 0 }; 2366 #define STRING_NULL(scope,value) #value "\0" 2367 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL) }; 2368 2369 #undef ONE_PLUS 2370 #undef VALUE_COMMA 2371 #undef STRING_NULL 2372 #undef EACH_NAMED_CON 2373 #endif 2374 2375 JVM_ENTRY(jint, MHI_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { 2376 #ifndef PRODUCT 2377 if (which >= 0 && which < con_value_count) { 2378 int con = con_values[which]; 2379 objArrayOop box = (objArrayOop) JNIHandles::resolve(box_jh); 2380 if (box != NULL && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { 2381 const char* str = &con_names[0]; 2382 for (int i = 0; i < which; i++) 2383 str += strlen(str) + 1; // skip name and null 2384 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); 2385 box->obj_at_put(0, name); 2386 } 2387 return con; 2388 } 2389 #endif 2390 return 0; 2391 } 2392 JVM_END 2393 2394 // void init(MemberName self, AccessibleObject ref) 2395 JVM_ENTRY(void, MHI_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { 2396 if (mname_jh == NULL || target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } 2397 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 2398 oop target_oop = JNIHandles::resolve_non_null(target_jh); 2399 MethodHandles::init_MemberName(mname(), target_oop); 2400 } 2401 JVM_END 2402 2403 // void expand(MemberName self) 2404 JVM_ENTRY(void, MHI_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { 2405 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } 2406 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 2407 MethodHandles::expand_MemberName(mname, 0, CHECK); 2408 } 2409 JVM_END 2410 2411 // void resolve(MemberName self, Class<?> caller) 2412 JVM_ENTRY(void, MHI_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { 2413 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } 2414 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 2415 2416 // The trusted Java code that calls this method should already have performed 2417 // access checks on behalf of the given caller. But, we can verify this. 2418 if (VerifyMethodHandles && caller_jh != NULL) { 2419 klassOop reference_klass = java_lang_Class::as_klassOop(sun_dyn_MemberName::clazz(mname())); 2420 if (reference_klass != NULL) { 2421 // Emulate LinkResolver::check_klass_accessability. 2422 klassOop caller = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh)); 2423 if (!Reflection::verify_class_access(caller, 2424 reference_klass, 2425 true)) { 2426 THROW_MSG(vmSymbols::java_lang_InternalError(), Klass::cast(reference_klass)->external_name()); 2427 } 2428 } 2429 } 2430 2431 MethodHandles::resolve_MemberName(mname, CHECK); 2432 } 2433 JVM_END 2434 2435 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 2436 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 2437 JVM_ENTRY(jint, MHI_getMembers(JNIEnv *env, jobject igcls, 2438 jclass clazz_jh, jstring name_jh, jstring sig_jh, 2439 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { 2440 if (clazz_jh == NULL || results_jh == NULL) return -1; 2441 klassOop k_oop = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz_jh)); 2442 2443 objArrayOop results = (objArrayOop) JNIHandles::resolve(results_jh); 2444 if (results == NULL || !results->is_objArray()) return -1; 2445 2446 symbolOop name = NULL, sig = NULL; 2447 if (name_jh != NULL) { 2448 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); 2449 if (name == NULL) return 0; // a match is not possible 2450 } 2451 if (sig_jh != NULL) { 2452 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); 2453 if (sig == NULL) return 0; // a match is not possible 2454 } 2455 2456 klassOop caller = NULL; 2457 if (caller_jh != NULL) { 2458 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); 2459 if (!java_lang_Class::is_instance(caller_oop)) return -1; 2460 caller = java_lang_Class::as_klassOop(caller_oop); 2461 } 2462 2463 if (name != NULL && sig != NULL && results != NULL) { 2464 // try a direct resolve 2465 // %%% TO DO 2466 } 2467 2468 int res = MethodHandles::find_MemberNames(k_oop, name, sig, mflags, 2469 caller, skip, results); 2470 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks 2471 return res; 2472 } 2473 JVM_END 2474 2475 JVM_ENTRY(void, MHI_registerBootstrap(JNIEnv *env, jobject igcls, jclass caller_jh, jobject bsm_jh)) { 2476 instanceKlassHandle ik = MethodHandles::resolve_instance_klass(caller_jh, THREAD); 2477 if (!AllowTransitionalJSR292) { 2478 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 2479 "registerBootstrapMethod is only supported in JSR 292 EDR"); 2480 } 2481 ik->link_class(CHECK); 2482 if (!java_dyn_MethodHandle::is_instance(JNIHandles::resolve(bsm_jh))) { 2483 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "method handle"); 2484 } 2485 const char* err = NULL; 2486 if (ik->is_initialized() || ik->is_in_error_state()) { 2487 err = "too late: class is already initialized"; 2488 } else { 2489 ObjectLocker ol(ik, THREAD); // note: this should be a recursive lock 2490 if (ik->is_not_initialized() || 2491 (ik->is_being_initialized() && ik->is_reentrant_initialization(THREAD))) { 2492 if (ik->bootstrap_method() != NULL) { 2493 err = "class is already equipped with a bootstrap method"; 2494 } else { 2495 ik->set_bootstrap_method(JNIHandles::resolve_non_null(bsm_jh)); 2496 err = NULL; 2497 } 2498 } else { 2499 err = "class is already initialized"; 2500 if (ik->is_being_initialized()) 2501 err = "class is already being initialized in a different thread"; 2502 } 2503 } 2504 if (err != NULL) { 2505 THROW_MSG(vmSymbols::java_lang_IllegalStateException(), err); 2506 } 2507 } 2508 JVM_END 2509 2510 JVM_ENTRY(jobject, MHI_getBootstrap(JNIEnv *env, jobject igcls, jclass caller_jh)) { 2511 instanceKlassHandle ik = MethodHandles::resolve_instance_klass(caller_jh, THREAD); 2512 return JNIHandles::make_local(THREAD, ik->bootstrap_method()); 2513 } 2514 JVM_END 2515 2516 JVM_ENTRY(void, MHI_setCallSiteTarget(JNIEnv *env, jobject igcls, jobject site_jh, jobject target_jh)) { 2517 // No special action required, yet. 2518 oop site_oop = JNIHandles::resolve(site_jh); 2519 if (!java_dyn_CallSite::is_instance(site_oop)) 2520 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "not a CallSite"); 2521 java_dyn_CallSite::set_target(site_oop, JNIHandles::resolve(target_jh)); 2522 } 2523 JVM_END 2524 2525 2526 /// JVM_RegisterMethodHandleMethods 2527 2528 #define ADR "J" 2529 2530 #define LANG "Ljava/lang/" 2531 #define JDYN "Ljava/dyn/" 2532 #define IDYN "Lsun/dyn/" 2533 2534 #define OBJ LANG"Object;" 2535 #define CLS LANG"Class;" 2536 #define STRG LANG"String;" 2537 #define CST JDYN"CallSite;" 2538 #define MT JDYN"MethodType;" 2539 #define MH JDYN"MethodHandle;" 2540 #define MHI IDYN"MethodHandleImpl;" 2541 #define MEM IDYN"MemberName;" 2542 #define AMH IDYN"AdapterMethodHandle;" 2543 #define BMH IDYN"BoundMethodHandle;" 2544 #define DMH IDYN"DirectMethodHandle;" 2545 2546 #define CC (char*) /*cast a literal from (const char*)*/ 2547 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 2548 2549 // These are the native methods on sun.dyn.MethodHandleNatives. 2550 static JNINativeMethod methods[] = { 2551 // void init(MemberName self, AccessibleObject ref) 2552 {CC"init", CC"("AMH""MH"I)V", FN_PTR(MHI_init_AMH)}, 2553 {CC"init", CC"("BMH""OBJ"I)V", FN_PTR(MHI_init_BMH)}, 2554 {CC"init", CC"("DMH""OBJ"Z"CLS")V", FN_PTR(MHI_init_DMH)}, 2555 {CC"init", CC"("MT")V", FN_PTR(MHI_init_MT)}, 2556 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHI_init_Mem)}, 2557 {CC"expand", CC"("MEM")V", FN_PTR(MHI_expand_Mem)}, 2558 {CC"resolve", CC"("MEM""CLS")V", FN_PTR(MHI_resolve_Mem)}, 2559 {CC"getTarget", CC"("MH"I)"OBJ, FN_PTR(MHI_getTarget)}, 2560 {CC"getConstant", CC"(I)I", FN_PTR(MHI_getConstant)}, 2561 // static native int getNamedCon(int which, Object[] name) 2562 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHI_getNamedCon)}, 2563 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 2564 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 2565 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHI_getMembers)} 2566 }; 2567 2568 // More entry points specifically for EnableInvokeDynamic. 2569 static JNINativeMethod methods2[] = { 2570 {CC"registerBootstrap", CC"("CLS MH")V", FN_PTR(MHI_registerBootstrap)}, 2571 {CC"getBootstrap", CC"("CLS")"MH, FN_PTR(MHI_getBootstrap)}, 2572 {CC"setCallSiteTarget", CC"("CST MH")V", FN_PTR(MHI_setCallSiteTarget)} 2573 }; 2574 2575 2576 // This one function is exported, used by NativeLookup. 2577 2578 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { 2579 assert(MethodHandles::spot_check_entry_names(), "entry enum is OK"); 2580 2581 // note: this explicit warning-producing stuff will be replaced by auto-detection of the JSR 292 classes 2582 2583 if (!EnableMethodHandles) { 2584 warning("JSR 292 method handles are disabled in this JVM. Use -XX:+UnlockExperimentalVMOptions -XX:+EnableMethodHandles to enable."); 2585 return; // bind nothing 2586 } 2587 2588 bool enable_MH = true; 2589 2590 { 2591 ThreadToNativeFromVM ttnfv(thread); 2592 2593 int status = env->RegisterNatives(MHN_class, methods, sizeof(methods)/sizeof(JNINativeMethod)); 2594 if (env->ExceptionOccurred()) { 2595 MethodHandles::set_enabled(false); 2596 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); 2597 enable_MH = false; 2598 env->ExceptionClear(); 2599 } 2600 } 2601 2602 if (enable_MH) { 2603 KlassHandle MHI_klass = SystemDictionaryHandles::MethodHandleImpl_klass(); 2604 if (MHI_klass.not_null()) { 2605 symbolHandle raiseException_name = oopFactory::new_symbol_handle("raiseException", CHECK); 2606 symbolHandle raiseException_sig = oopFactory::new_symbol_handle("(ILjava/lang/Object;Ljava/lang/Object;)V", CHECK); 2607 methodOop raiseException_method = instanceKlass::cast(MHI_klass->as_klassOop()) 2608 ->find_method(raiseException_name(), raiseException_sig()); 2609 if (raiseException_method != NULL && raiseException_method->is_static()) { 2610 MethodHandles::set_raise_exception_method(raiseException_method); 2611 } else { 2612 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); 2613 enable_MH = false; 2614 } 2615 } 2616 } 2617 2618 if (enable_MH) { 2619 MethodHandles::set_enabled(true); 2620 } 2621 2622 if (!EnableInvokeDynamic) { 2623 warning("JSR 292 invokedynamic is disabled in this JVM. Use -XX:+UnlockExperimentalVMOptions -XX:+EnableInvokeDynamic to enable."); 2624 return; // bind nothing 2625 } 2626 2627 { 2628 ThreadToNativeFromVM ttnfv(thread); 2629 2630 int status = env->RegisterNatives(MHN_class, methods2, sizeof(methods2)/sizeof(JNINativeMethod)); 2631 if (env->ExceptionOccurred()) { 2632 MethodHandles::set_enabled(false); 2633 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); 2634 env->ExceptionClear(); 2635 } else { 2636 MethodHandles::set_enabled(true); 2637 } 2638 } 2639 } 2640 JVM_END