1 /* 2 * Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/symbolTable.hpp" 27 #include "interpreter/interpreter.hpp" 28 #include "memory/allocation.inline.hpp" 29 #include "memory/oopFactory.hpp" 30 #include "prims/methodHandles.hpp" 31 #include "runtime/javaCalls.hpp" 32 #include "runtime/reflection.hpp" 33 #include "runtime/signature.hpp" 34 #include "runtime/stubRoutines.hpp" 35 36 /* 37 * JSR 292 reference implementation: method handles 38 */ 39 40 bool MethodHandles::_enabled = false; // set true after successful native linkage 41 42 MethodHandleEntry* MethodHandles::_entries[MethodHandles::_EK_LIMIT] = {NULL}; 43 const char* MethodHandles::_entry_names[_EK_LIMIT+1] = { 44 "raise_exception", 45 "invokestatic", // how a MH emulates invokestatic 46 "invokespecial", // ditto for the other invokes... 47 "invokevirtual", 48 "invokeinterface", 49 "bound_ref", // these are for BMH... 50 "bound_int", 51 "bound_long", 52 "bound_ref_direct", // (direct versions have a direct methodOop) 53 "bound_int_direct", 54 "bound_long_direct", 55 56 // starting at _adapter_mh_first: 57 "adapter_retype_only", // these are for AMH... 58 "adapter_retype_raw", 59 "adapter_check_cast", 60 "adapter_prim_to_prim", 61 "adapter_ref_to_prim", 62 "adapter_prim_to_ref", 63 "adapter_swap_args", 64 "adapter_rot_args", 65 "adapter_dup_args", 66 "adapter_drop_args", 67 "adapter_collect_args", 68 "adapter_spread_args", 69 "adapter_flyby", 70 "adapter_ricochet", 71 72 // optimized adapter types: 73 "adapter_swap_args/1", 74 "adapter_swap_args/2", 75 "adapter_rot_args/1,up", 76 "adapter_rot_args/1,down", 77 "adapter_rot_args/2,up", 78 "adapter_rot_args/2,down", 79 "adapter_prim_to_prim/i2i", 80 "adapter_prim_to_prim/l2i", 81 "adapter_prim_to_prim/d2f", 82 "adapter_prim_to_prim/i2l", 83 "adapter_prim_to_prim/f2d", 84 "adapter_ref_to_prim/unboxi", 85 "adapter_ref_to_prim/unboxl", 86 "adapter_spread_args/0", 87 "adapter_spread_args/1", 88 "adapter_spread_args/more", 89 90 NULL 91 }; 92 93 // Adapters. 94 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL; 95 int MethodHandles::_adapter_code_size = StubRoutines::method_handles_adapters_code_size; 96 97 jobject MethodHandles::_raise_exception_method; 98 99 #ifdef ASSERT 100 bool MethodHandles::spot_check_entry_names() { 101 assert(!strcmp(entry_name(_invokestatic_mh), "invokestatic"), ""); 102 assert(!strcmp(entry_name(_bound_ref_mh), "bound_ref"), ""); 103 assert(!strcmp(entry_name(_adapter_retype_only), "adapter_retype_only"), ""); 104 assert(!strcmp(entry_name(_adapter_ricochet), "adapter_ricochet"), ""); 105 assert(!strcmp(entry_name(_adapter_opt_unboxi), "adapter_ref_to_prim/unboxi"), ""); 106 return true; 107 } 108 #endif 109 110 111 //------------------------------------------------------------------------------ 112 // MethodHandles::generate_adapters 113 // 114 void MethodHandles::generate_adapters() { 115 if (!EnableMethodHandles || SystemDictionary::MethodHandle_klass() == NULL) return; 116 117 assert(_adapter_code == NULL, "generate only once"); 118 119 ResourceMark rm; 120 TraceTime timer("MethodHandles adapters generation", TraceStartupTime); 121 _adapter_code = MethodHandlesAdapterBlob::create(_adapter_code_size); 122 if (_adapter_code == NULL) 123 vm_exit_out_of_memory(_adapter_code_size, "CodeCache: no room for MethodHandles adapters"); 124 CodeBuffer code(_adapter_code); 125 MethodHandlesAdapterGenerator g(&code); 126 g.generate(); 127 } 128 129 130 //------------------------------------------------------------------------------ 131 // MethodHandlesAdapterGenerator::generate 132 // 133 void MethodHandlesAdapterGenerator::generate() { 134 // Generate generic method handle adapters. 135 for (MethodHandles::EntryKind ek = MethodHandles::_EK_FIRST; 136 ek < MethodHandles::_EK_LIMIT; 137 ek = MethodHandles::EntryKind(1 + (int)ek)) { 138 StubCodeMark mark(this, "MethodHandle", MethodHandles::entry_name(ek)); 139 MethodHandles::generate_method_handle_stub(_masm, ek); 140 } 141 } 142 143 144 void MethodHandles::set_enabled(bool z) { 145 if (_enabled != z) { 146 guarantee(z && EnableMethodHandles, "can only enable once, and only if -XX:+EnableMethodHandles"); 147 _enabled = z; 148 } 149 } 150 151 // Note: A method which does not have a TRAPS argument cannot block in the GC 152 // or throw exceptions. Such methods are used in this file to do something quick 153 // and local, like parse a data structure. For speed, such methods work on plain 154 // oops, not handles. Trapping methods uniformly operate on handles. 155 156 methodOop MethodHandles::decode_vmtarget(oop vmtarget, int vmindex, oop mtype, 157 klassOop& receiver_limit_result, int& decode_flags_result) { 158 if (vmtarget == NULL) return NULL; 159 assert(methodOopDesc::nonvirtual_vtable_index < 0, "encoding"); 160 if (vmindex < 0) { 161 // this DMH performs no dispatch; it is directly bound to a methodOop 162 // A MemberName may either be directly bound to a methodOop, 163 // or it may use the klass/index form; both forms mean the same thing. 164 methodOop m = decode_methodOop(methodOop(vmtarget), decode_flags_result); 165 if ((decode_flags_result & _dmf_has_receiver) != 0 166 && java_dyn_MethodType::is_instance(mtype)) { 167 // Extract receiver type restriction from mtype.ptypes[0]. 168 objArrayOop ptypes = java_dyn_MethodType::ptypes(mtype); 169 oop ptype0 = (ptypes == NULL || ptypes->length() < 1) ? oop(NULL) : ptypes->obj_at(0); 170 if (java_lang_Class::is_instance(ptype0)) 171 receiver_limit_result = java_lang_Class::as_klassOop(ptype0); 172 } 173 if (vmindex == methodOopDesc::nonvirtual_vtable_index) { 174 // this DMH can be an "invokespecial" version 175 decode_flags_result &= ~_dmf_does_dispatch; 176 } else { 177 assert(vmindex == methodOopDesc::invalid_vtable_index, "random vmindex?"); 178 } 179 return m; 180 } else { 181 assert(vmtarget->is_klass(), "must be class or interface"); 182 decode_flags_result |= MethodHandles::_dmf_does_dispatch; 183 decode_flags_result |= MethodHandles::_dmf_has_receiver; 184 receiver_limit_result = (klassOop)vmtarget; 185 Klass* tk = Klass::cast((klassOop)vmtarget); 186 if (tk->is_interface()) { 187 // an itable linkage is <interface, itable index> 188 decode_flags_result |= MethodHandles::_dmf_from_interface; 189 return klassItable::method_for_itable_index((klassOop)vmtarget, vmindex); 190 } else { 191 if (!tk->oop_is_instance()) 192 tk = instanceKlass::cast(SystemDictionary::Object_klass()); 193 return ((instanceKlass*)tk)->method_at_vtable(vmindex); 194 } 195 } 196 } 197 198 // MemberName and DirectMethodHandle have the same linkage to the JVM internals. 199 // (MemberName is the non-operational name used for queries and setup.) 200 201 methodOop MethodHandles::decode_DirectMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { 202 oop vmtarget = sun_dyn_DirectMethodHandle::vmtarget(mh); 203 int vmindex = sun_dyn_DirectMethodHandle::vmindex(mh); 204 oop mtype = sun_dyn_DirectMethodHandle::type(mh); 205 return decode_vmtarget(vmtarget, vmindex, mtype, receiver_limit_result, decode_flags_result); 206 } 207 208 methodOop MethodHandles::decode_BoundMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { 209 assert(sun_dyn_BoundMethodHandle::is_instance(mh), ""); 210 assert(mh->klass() != SystemDictionary::AdapterMethodHandle_klass(), ""); 211 for (oop bmh = mh;;) { 212 // Bound MHs can be stacked to bind several arguments. 213 oop target = java_dyn_MethodHandle::vmtarget(bmh); 214 if (target == NULL) return NULL; 215 decode_flags_result |= MethodHandles::_dmf_binds_argument; 216 klassOop tk = target->klass(); 217 if (tk == SystemDictionary::BoundMethodHandle_klass()) { 218 bmh = target; 219 continue; 220 } else { 221 if (java_dyn_MethodHandle::is_subclass(tk)) { 222 //assert(tk == SystemDictionary::DirectMethodHandle_klass(), "end of BMH chain must be DMH"); 223 return decode_MethodHandle(target, receiver_limit_result, decode_flags_result); 224 } else { 225 // Optimized case: binding a receiver to a non-dispatched DMH 226 // short-circuits directly to the methodOop. 227 // (It might be another argument besides a receiver also.) 228 assert(target->is_method(), "must be a simple method"); 229 decode_flags_result |= MethodHandles::_dmf_binds_method; 230 methodOop m = (methodOop) target; 231 if (!m->is_static()) 232 decode_flags_result |= MethodHandles::_dmf_has_receiver; 233 return m; 234 } 235 } 236 } 237 } 238 239 methodOop MethodHandles::decode_AdapterMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { 240 assert(mh->klass() == SystemDictionary::AdapterMethodHandle_klass(), ""); 241 for (oop amh = mh;;) { 242 // Adapter MHs can be stacked to convert several arguments. 243 int conv_op = adapter_conversion_op(sun_dyn_AdapterMethodHandle::conversion(amh)); 244 decode_flags_result |= (_dmf_adapter_lsb << conv_op) & _DMF_ADAPTER_MASK; 245 oop target = java_dyn_MethodHandle::vmtarget(amh); 246 if (target == NULL) return NULL; 247 klassOop tk = target->klass(); 248 if (tk == SystemDictionary::AdapterMethodHandle_klass()) { 249 amh = target; 250 continue; 251 } else { 252 // must be a BMH (which will bind some more arguments) or a DMH (for the final call) 253 return MethodHandles::decode_MethodHandle(target, receiver_limit_result, decode_flags_result); 254 } 255 } 256 } 257 258 methodOop MethodHandles::decode_MethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { 259 if (mh == NULL) return NULL; 260 klassOop mhk = mh->klass(); 261 assert(java_dyn_MethodHandle::is_subclass(mhk), "must be a MethodHandle"); 262 if (mhk == SystemDictionary::DirectMethodHandle_klass()) { 263 return decode_DirectMethodHandle(mh, receiver_limit_result, decode_flags_result); 264 } else if (mhk == SystemDictionary::BoundMethodHandle_klass()) { 265 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result); 266 } else if (mhk == SystemDictionary::AdapterMethodHandle_klass()) { 267 return decode_AdapterMethodHandle(mh, receiver_limit_result, decode_flags_result); 268 } else if (sun_dyn_BoundMethodHandle::is_subclass(mhk)) { 269 // could be a JavaMethodHandle (but not an adapter MH) 270 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result); 271 } else { 272 assert(false, "cannot parse this MH"); 273 return NULL; // random MH? 274 } 275 } 276 277 methodOop MethodHandles::decode_methodOop(methodOop m, int& decode_flags_result) { 278 assert(m->is_method(), ""); 279 if (m->is_static()) { 280 // check that signature begins '(L' or '([' (not '(I', '()', etc.) 281 Symbol* sig = m->signature(); 282 BasicType recv_bt = char2type(sig->byte_at(1)); 283 // Note: recv_bt might be T_ILLEGAL if byte_at(2) is ')' 284 assert(sig->byte_at(0) == '(', "must be method sig"); 285 // if (recv_bt == T_OBJECT || recv_bt == T_ARRAY) 286 // decode_flags_result |= _dmf_has_receiver; 287 } else { 288 // non-static method 289 decode_flags_result |= _dmf_has_receiver; 290 if (!m->can_be_statically_bound() && !m->is_initializer()) { 291 decode_flags_result |= _dmf_does_dispatch; 292 if (Klass::cast(m->method_holder())->is_interface()) 293 decode_flags_result |= _dmf_from_interface; 294 } 295 } 296 return m; 297 } 298 299 300 // A trusted party is handing us a cookie to determine a method. 301 // Let's boil it down to the method oop they really want. 302 methodOop MethodHandles::decode_method(oop x, klassOop& receiver_limit_result, int& decode_flags_result) { 303 decode_flags_result = 0; 304 receiver_limit_result = NULL; 305 klassOop xk = x->klass(); 306 if (xk == Universe::methodKlassObj()) { 307 return decode_methodOop((methodOop) x, decode_flags_result); 308 } else if (xk == SystemDictionary::MemberName_klass()) { 309 // Note: This only works if the MemberName has already been resolved. 310 return decode_MemberName(x, receiver_limit_result, decode_flags_result); 311 } else if (java_dyn_MethodHandle::is_subclass(xk)) { 312 return decode_MethodHandle(x, receiver_limit_result, decode_flags_result); 313 } else if (xk == SystemDictionary::reflect_Method_klass()) { 314 oop clazz = java_lang_reflect_Method::clazz(x); 315 int slot = java_lang_reflect_Method::slot(x); 316 klassOop k = java_lang_Class::as_klassOop(clazz); 317 if (k != NULL && Klass::cast(k)->oop_is_instance()) 318 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot), 319 decode_flags_result); 320 } else if (xk == SystemDictionary::reflect_Constructor_klass()) { 321 oop clazz = java_lang_reflect_Constructor::clazz(x); 322 int slot = java_lang_reflect_Constructor::slot(x); 323 klassOop k = java_lang_Class::as_klassOop(clazz); 324 if (k != NULL && Klass::cast(k)->oop_is_instance()) 325 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot), 326 decode_flags_result); 327 } else { 328 // unrecognized object 329 assert(!x->is_method(), "already checked"); 330 assert(!sun_dyn_MemberName::is_instance(x), "already checked"); 331 } 332 return NULL; 333 } 334 335 336 int MethodHandles::decode_MethodHandle_stack_pushes(oop mh) { 337 if (mh->klass() == SystemDictionary::DirectMethodHandle_klass()) 338 return 0; // no push/pop 339 int this_vmslots = java_dyn_MethodHandle::vmslots(mh); 340 int last_vmslots = 0; 341 oop last_mh = mh; 342 for (;;) { 343 oop target = java_dyn_MethodHandle::vmtarget(last_mh); 344 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) { 345 last_vmslots = java_dyn_MethodHandle::vmslots(target); 346 break; 347 } else if (!java_dyn_MethodHandle::is_instance(target)) { 348 // might be klass or method 349 assert(target->is_method(), "must get here with a direct ref to method"); 350 last_vmslots = methodOop(target)->size_of_parameters(); 351 break; 352 } 353 last_mh = target; 354 } 355 // If I am called with fewer VM slots than my ultimate callee, 356 // it must be that I push the additionally needed slots. 357 // Likewise if am called with more VM slots, I will pop them. 358 return (last_vmslots - this_vmslots); 359 } 360 361 362 // MemberName support 363 364 // import sun_dyn_MemberName.* 365 enum { 366 IS_METHOD = sun_dyn_MemberName::MN_IS_METHOD, 367 IS_CONSTRUCTOR = sun_dyn_MemberName::MN_IS_CONSTRUCTOR, 368 IS_FIELD = sun_dyn_MemberName::MN_IS_FIELD, 369 IS_TYPE = sun_dyn_MemberName::MN_IS_TYPE, 370 SEARCH_SUPERCLASSES = sun_dyn_MemberName::MN_SEARCH_SUPERCLASSES, 371 SEARCH_INTERFACES = sun_dyn_MemberName::MN_SEARCH_INTERFACES, 372 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE, 373 VM_INDEX_UNINITIALIZED = sun_dyn_MemberName::VM_INDEX_UNINITIALIZED 374 }; 375 376 Handle MethodHandles::new_MemberName(TRAPS) { 377 Handle empty; 378 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass()); 379 if (!k->is_initialized()) k->initialize(CHECK_(empty)); 380 return Handle(THREAD, k->allocate_instance(THREAD)); 381 } 382 383 void MethodHandles::init_MemberName(oop mname_oop, oop target_oop) { 384 if (target_oop->klass() == SystemDictionary::reflect_Field_klass()) { 385 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() 386 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() 387 int mods = java_lang_reflect_Field::modifiers(target_oop); 388 klassOop k = java_lang_Class::as_klassOop(clazz); 389 int offset = instanceKlass::cast(k)->offset_from_fields(slot); 390 init_MemberName(mname_oop, k, accessFlags_from(mods), offset); 391 } else { 392 int decode_flags = 0; klassOop receiver_limit = NULL; 393 methodOop m = MethodHandles::decode_method(target_oop, 394 receiver_limit, decode_flags); 395 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0); 396 init_MemberName(mname_oop, m, do_dispatch); 397 } 398 } 399 400 void MethodHandles::init_MemberName(oop mname_oop, methodOop m, bool do_dispatch) { 401 int flags = ((m->is_initializer() ? IS_CONSTRUCTOR : IS_METHOD) 402 | (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS )); 403 oop vmtarget = m; 404 int vmindex = methodOopDesc::invalid_vtable_index; // implies no info yet 405 if (!do_dispatch || (flags & IS_CONSTRUCTOR) || m->can_be_statically_bound()) 406 vmindex = methodOopDesc::nonvirtual_vtable_index; // implies never any dispatch 407 assert(vmindex != VM_INDEX_UNINITIALIZED, "Java sentinel value"); 408 sun_dyn_MemberName::set_vmtarget(mname_oop, vmtarget); 409 sun_dyn_MemberName::set_vmindex(mname_oop, vmindex); 410 sun_dyn_MemberName::set_flags(mname_oop, flags); 411 sun_dyn_MemberName::set_clazz(mname_oop, Klass::cast(m->method_holder())->java_mirror()); 412 } 413 414 void MethodHandles::init_MemberName(oop mname_oop, klassOop field_holder, AccessFlags mods, int offset) { 415 int flags = (IS_FIELD | (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS )); 416 oop vmtarget = field_holder; 417 int vmindex = offset; // determines the field uniquely when combined with static bit 418 assert(vmindex != VM_INDEX_UNINITIALIZED, "bad alias on vmindex"); 419 sun_dyn_MemberName::set_vmtarget(mname_oop, vmtarget); 420 sun_dyn_MemberName::set_vmindex(mname_oop, vmindex); 421 sun_dyn_MemberName::set_flags(mname_oop, flags); 422 sun_dyn_MemberName::set_clazz(mname_oop, Klass::cast(field_holder)->java_mirror()); 423 } 424 425 426 methodOop MethodHandles::decode_MemberName(oop mname, klassOop& receiver_limit_result, int& decode_flags_result) { 427 int flags = sun_dyn_MemberName::flags(mname); 428 if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) == 0) return NULL; // not invocable 429 oop vmtarget = sun_dyn_MemberName::vmtarget(mname); 430 int vmindex = sun_dyn_MemberName::vmindex(mname); 431 if (vmindex == VM_INDEX_UNINITIALIZED) return NULL; // not resolved 432 methodOop m = decode_vmtarget(vmtarget, vmindex, NULL, receiver_limit_result, decode_flags_result); 433 oop clazz = sun_dyn_MemberName::clazz(mname); 434 if (clazz != NULL && java_lang_Class::is_instance(clazz)) { 435 klassOop klass = java_lang_Class::as_klassOop(clazz); 436 if (klass != NULL) receiver_limit_result = klass; 437 } 438 return m; 439 } 440 441 // convert the external string or reflective type to an internal signature 442 Symbol* MethodHandles::convert_to_signature(oop type_str, 443 bool polymorphic, 444 TRAPS) { 445 if (java_dyn_MethodType::is_instance(type_str)) { 446 return java_dyn_MethodType::as_signature(type_str, polymorphic, CHECK_NULL); 447 } else if (java_lang_Class::is_instance(type_str)) { 448 return java_lang_Class::as_signature(type_str, false, CHECK_NULL); 449 } else if (java_lang_String::is_instance(type_str)) { 450 if (polymorphic) { 451 return java_lang_String::as_symbol(type_str, CHECK_NULL); 452 } else { 453 return java_lang_String::as_symbol_or_null(type_str); 454 } 455 } else { 456 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL); 457 } 458 } 459 460 // An unresolved member name is a mere symbolic reference. 461 // Resolving it plants a vmtarget/vmindex in it, 462 // which refers dirctly to JVM internals. 463 void MethodHandles::resolve_MemberName(Handle mname, TRAPS) { 464 assert(sun_dyn_MemberName::is_instance(mname()), ""); 465 #ifdef ASSERT 466 // If this assert throws, renegotiate the sentinel value used by the Java code, 467 // so that it is distinct from any valid vtable index value, and any special 468 // values defined in methodOopDesc::VtableIndexFlag. 469 // The point of the slop is to give the Java code and the JVM some room 470 // to independently specify sentinel values. 471 const int sentinel_slop = 10; 472 const int sentinel_limit = methodOopDesc::highest_unused_vtable_index_value - sentinel_slop; 473 assert(VM_INDEX_UNINITIALIZED < sentinel_limit, "Java sentinel != JVM sentinels"); 474 #endif 475 if (sun_dyn_MemberName::vmindex(mname()) != VM_INDEX_UNINITIALIZED) 476 return; // already resolved 477 oop defc_oop = sun_dyn_MemberName::clazz(mname()); 478 oop name_str = sun_dyn_MemberName::name(mname()); 479 oop type_str = sun_dyn_MemberName::type(mname()); 480 int flags = sun_dyn_MemberName::flags(mname()); 481 482 if (defc_oop == NULL || name_str == NULL || type_str == NULL) { 483 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve"); 484 } 485 klassOop defc_klassOop = java_lang_Class::as_klassOop(defc_oop); 486 defc_oop = NULL; // safety 487 if (defc_klassOop == NULL) return; // a primitive; no resolution possible 488 if (!Klass::cast(defc_klassOop)->oop_is_instance()) { 489 if (!Klass::cast(defc_klassOop)->oop_is_array()) return; 490 defc_klassOop = SystemDictionary::Object_klass(); 491 } 492 instanceKlassHandle defc(THREAD, defc_klassOop); 493 defc_klassOop = NULL; // safety 494 if (defc.is_null()) { 495 THROW_MSG(vmSymbols::java_lang_InternalError(), "primitive class"); 496 } 497 defc->link_class(CHECK); 498 499 // convert the external string name to an internal symbol 500 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str); 501 if (name == NULL) return; // no such name 502 name_str = NULL; // safety 503 504 Handle polymorphic_method_type; 505 bool polymorphic_signature = false; 506 if ((flags & ALL_KINDS) == IS_METHOD && 507 (defc() == SystemDictionary::MethodHandle_klass() && 508 methodOopDesc::is_method_handle_invoke_name(name))) 509 polymorphic_signature = true; 510 511 // convert the external string or reflective type to an internal signature 512 TempNewSymbol type = convert_to_signature(type_str, polymorphic_signature, CHECK); 513 if (java_dyn_MethodType::is_instance(type_str) && polymorphic_signature) { 514 polymorphic_method_type = Handle(THREAD, type_str); //preserve exactly 515 } 516 517 if (type == NULL) return; // no such signature exists in the VM 518 type_str = NULL; // safety 519 520 // Time to do the lookup. 521 switch (flags & ALL_KINDS) { 522 case IS_METHOD: 523 { 524 CallInfo result; 525 { 526 EXCEPTION_MARK; 527 if ((flags & JVM_ACC_STATIC) != 0) { 528 LinkResolver::resolve_static_call(result, 529 defc, name, type, KlassHandle(), false, false, THREAD); 530 } else if (defc->is_interface()) { 531 LinkResolver::resolve_interface_call(result, Handle(), defc, 532 defc, name, type, KlassHandle(), false, false, THREAD); 533 } else { 534 LinkResolver::resolve_virtual_call(result, Handle(), defc, 535 defc, name, type, KlassHandle(), false, false, THREAD); 536 } 537 if (HAS_PENDING_EXCEPTION) { 538 CLEAR_PENDING_EXCEPTION; 539 break; // go to second chance 540 } 541 } 542 methodHandle m = result.resolved_method(); 543 oop vmtarget = NULL; 544 int vmindex = methodOopDesc::nonvirtual_vtable_index; 545 if (defc->is_interface()) { 546 vmindex = klassItable::compute_itable_index(m()); 547 assert(vmindex >= 0, ""); 548 } else if (result.has_vtable_index()) { 549 vmindex = result.vtable_index(); 550 assert(vmindex >= 0, ""); 551 } 552 assert(vmindex != VM_INDEX_UNINITIALIZED, ""); 553 if (vmindex < 0) { 554 assert(result.is_statically_bound(), ""); 555 vmtarget = m(); 556 } else { 557 vmtarget = result.resolved_klass()->as_klassOop(); 558 } 559 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS); 560 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget); 561 sun_dyn_MemberName::set_vmindex(mname(), vmindex); 562 sun_dyn_MemberName::set_modifiers(mname(), mods); 563 DEBUG_ONLY(int junk; klassOop junk2); 564 assert(decode_MemberName(mname(), junk2, junk) == result.resolved_method()(), 565 "properly stored for later decoding"); 566 return; 567 } 568 case IS_CONSTRUCTOR: 569 { 570 CallInfo result; 571 { 572 EXCEPTION_MARK; 573 if (name == vmSymbols::object_initializer_name()) { 574 LinkResolver::resolve_special_call(result, 575 defc, name, type, KlassHandle(), false, THREAD); 576 } else { 577 break; // will throw after end of switch 578 } 579 if (HAS_PENDING_EXCEPTION) { 580 CLEAR_PENDING_EXCEPTION; 581 return; 582 } 583 } 584 assert(result.is_statically_bound(), ""); 585 methodHandle m = result.resolved_method(); 586 oop vmtarget = m(); 587 int vmindex = methodOopDesc::nonvirtual_vtable_index; 588 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS); 589 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget); 590 sun_dyn_MemberName::set_vmindex(mname(), vmindex); 591 sun_dyn_MemberName::set_modifiers(mname(), mods); 592 DEBUG_ONLY(int junk; klassOop junk2); 593 assert(decode_MemberName(mname(), junk2, junk) == result.resolved_method()(), 594 "properly stored for later decoding"); 595 return; 596 } 597 case IS_FIELD: 598 { 599 // This is taken from LinkResolver::resolve_field, sans access checks. 600 fieldDescriptor fd; // find_field initializes fd if found 601 KlassHandle sel_klass(THREAD, instanceKlass::cast(defc())->find_field(name, type, &fd)); 602 // check if field exists; i.e., if a klass containing the field def has been selected 603 if (sel_klass.is_null()) return; 604 oop vmtarget = sel_klass->as_klassOop(); 605 int vmindex = fd.offset(); 606 int mods = (fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS); 607 if (vmindex == VM_INDEX_UNINITIALIZED) break; // should not happen 608 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget); 609 sun_dyn_MemberName::set_vmindex(mname(), vmindex); 610 sun_dyn_MemberName::set_modifiers(mname(), mods); 611 return; 612 } 613 default: 614 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); 615 } 616 617 // Second chance. 618 if (polymorphic_method_type.not_null()) { 619 // Look on a non-null class loader. 620 Handle cur_class_loader; 621 const int nptypes = java_dyn_MethodType::ptype_count(polymorphic_method_type()); 622 for (int i = 0; i <= nptypes; i++) { 623 oop type_mirror; 624 if (i < nptypes) type_mirror = java_dyn_MethodType::ptype(polymorphic_method_type(), i); 625 else type_mirror = java_dyn_MethodType::rtype(polymorphic_method_type()); 626 klassOop example_type = java_lang_Class::as_klassOop(type_mirror); 627 if (example_type == NULL) continue; 628 oop class_loader = Klass::cast(example_type)->class_loader(); 629 if (class_loader == NULL || class_loader == cur_class_loader()) continue; 630 cur_class_loader = Handle(THREAD, class_loader); 631 methodOop m = SystemDictionary::find_method_handle_invoke(name, 632 type, 633 KlassHandle(THREAD, example_type), 634 THREAD); 635 if (HAS_PENDING_EXCEPTION) { 636 CLEAR_PENDING_EXCEPTION; 637 m = NULL; 638 // try again with a different class loader... 639 } 640 if (m != NULL) { 641 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS); 642 sun_dyn_MemberName::set_vmtarget(mname(), m); 643 sun_dyn_MemberName::set_vmindex(mname(), m->vtable_index()); 644 sun_dyn_MemberName::set_modifiers(mname(), mods); 645 return; 646 } 647 } 648 } 649 } 650 651 // Conversely, a member name which is only initialized from JVM internals 652 // may have null defc, name, and type fields. 653 // Resolving it plants a vmtarget/vmindex in it, 654 // which refers directly to JVM internals. 655 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { 656 assert(sun_dyn_MemberName::is_instance(mname()), ""); 657 oop vmtarget = sun_dyn_MemberName::vmtarget(mname()); 658 int vmindex = sun_dyn_MemberName::vmindex(mname()); 659 if (vmtarget == NULL || vmindex == VM_INDEX_UNINITIALIZED) { 660 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); 661 } 662 663 bool have_defc = (sun_dyn_MemberName::clazz(mname()) != NULL); 664 bool have_name = (sun_dyn_MemberName::name(mname()) != NULL); 665 bool have_type = (sun_dyn_MemberName::type(mname()) != NULL); 666 int flags = sun_dyn_MemberName::flags(mname()); 667 668 if (suppress != 0) { 669 if (suppress & _suppress_defc) have_defc = true; 670 if (suppress & _suppress_name) have_name = true; 671 if (suppress & _suppress_type) have_type = true; 672 } 673 674 if (have_defc && have_name && have_type) return; // nothing needed 675 676 switch (flags & ALL_KINDS) { 677 case IS_METHOD: 678 case IS_CONSTRUCTOR: 679 { 680 klassOop receiver_limit = NULL; 681 int decode_flags = 0; 682 methodHandle m(THREAD, decode_vmtarget(vmtarget, vmindex, NULL, 683 receiver_limit, decode_flags)); 684 if (m.is_null()) break; 685 if (!have_defc) { 686 klassOop defc = m->method_holder(); 687 if (receiver_limit != NULL && receiver_limit != defc 688 && Klass::cast(receiver_limit)->is_subtype_of(defc)) 689 defc = receiver_limit; 690 sun_dyn_MemberName::set_clazz(mname(), Klass::cast(defc)->java_mirror()); 691 } 692 if (!have_name) { 693 //not java_lang_String::create_from_symbol; let's intern member names 694 Handle name = StringTable::intern(m->name(), CHECK); 695 sun_dyn_MemberName::set_name(mname(), name()); 696 } 697 if (!have_type) { 698 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); 699 sun_dyn_MemberName::set_type(mname(), type()); 700 } 701 return; 702 } 703 case IS_FIELD: 704 { 705 // This is taken from LinkResolver::resolve_field, sans access checks. 706 if (!vmtarget->is_klass()) break; 707 if (!Klass::cast((klassOop) vmtarget)->oop_is_instance()) break; 708 instanceKlassHandle defc(THREAD, (klassOop) vmtarget); 709 bool is_static = ((flags & JVM_ACC_STATIC) != 0); 710 fieldDescriptor fd; // find_field initializes fd if found 711 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) 712 break; // cannot expand 713 if (!have_defc) { 714 sun_dyn_MemberName::set_clazz(mname(), defc->java_mirror()); 715 } 716 if (!have_name) { 717 //not java_lang_String::create_from_symbol; let's intern member names 718 Handle name = StringTable::intern(fd.name(), CHECK); 719 sun_dyn_MemberName::set_name(mname(), name()); 720 } 721 if (!have_type) { 722 Handle type = java_lang_String::create_from_symbol(fd.signature(), CHECK); 723 sun_dyn_MemberName::set_type(mname(), type()); 724 } 725 return; 726 } 727 } 728 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); 729 } 730 731 int MethodHandles::find_MemberNames(klassOop k, 732 Symbol* name, Symbol* sig, 733 int mflags, klassOop caller, 734 int skip, objArrayOop results) { 735 DEBUG_ONLY(No_Safepoint_Verifier nsv); 736 // this code contains no safepoints! 737 738 // %%% take caller into account! 739 740 if (k == NULL || !Klass::cast(k)->oop_is_instance()) return -1; 741 742 int rfill = 0, rlimit = results->length(), rskip = skip; 743 // overflow measurement: 744 int overflow = 0, overflow_limit = MAX2(1000, rlimit); 745 746 int match_flags = mflags; 747 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); 748 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); 749 bool local_only = !(search_superc | search_intfc); 750 bool classes_only = false; 751 752 if (name != NULL) { 753 if (name->utf8_length() == 0) return 0; // a match is not possible 754 } 755 if (sig != NULL) { 756 if (sig->utf8_length() == 0) return 0; // a match is not possible 757 if (sig->byte_at(0) == '(') 758 match_flags &= ~(IS_FIELD | IS_TYPE); 759 else 760 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); 761 } 762 763 if ((match_flags & IS_TYPE) != 0) { 764 // NYI, and Core Reflection works quite well for this query 765 } 766 767 if ((match_flags & IS_FIELD) != 0) { 768 for (FieldStream st(k, local_only, !search_intfc); !st.eos(); st.next()) { 769 if (name != NULL && st.name() != name) 770 continue; 771 if (sig != NULL && st.signature() != sig) 772 continue; 773 // passed the filters 774 if (rskip > 0) { 775 --rskip; 776 } else if (rfill < rlimit) { 777 oop result = results->obj_at(rfill++); 778 if (!sun_dyn_MemberName::is_instance(result)) 779 return -99; // caller bug! 780 MethodHandles::init_MemberName(result, st.klass()->as_klassOop(), st.access_flags(), st.offset()); 781 } else if (++overflow >= overflow_limit) { 782 match_flags = 0; break; // got tired of looking at overflow 783 } 784 } 785 } 786 787 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { 788 // watch out for these guys: 789 Symbol* init_name = vmSymbols::object_initializer_name(); 790 Symbol* clinit_name = vmSymbols::class_initializer_name(); 791 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> 792 bool negate_name_test = false; 793 // fix name so that it captures the intention of IS_CONSTRUCTOR 794 if (!(match_flags & IS_METHOD)) { 795 // constructors only 796 if (name == NULL) { 797 name = init_name; 798 } else if (name != init_name) { 799 return 0; // no constructors of this method name 800 } 801 } else if (!(match_flags & IS_CONSTRUCTOR)) { 802 // methods only 803 if (name == NULL) { 804 name = init_name; 805 negate_name_test = true; // if we see the name, we *omit* the entry 806 } else if (name == init_name) { 807 return 0; // no methods of this constructor name 808 } 809 } else { 810 // caller will accept either sort; no need to adjust name 811 } 812 for (MethodStream st(k, local_only, !search_intfc); !st.eos(); st.next()) { 813 methodOop m = st.method(); 814 Symbol* m_name = m->name(); 815 if (m_name == clinit_name) 816 continue; 817 if (name != NULL && ((m_name != name) ^ negate_name_test)) 818 continue; 819 if (sig != NULL && m->signature() != sig) 820 continue; 821 // passed the filters 822 if (rskip > 0) { 823 --rskip; 824 } else if (rfill < rlimit) { 825 oop result = results->obj_at(rfill++); 826 if (!sun_dyn_MemberName::is_instance(result)) 827 return -99; // caller bug! 828 MethodHandles::init_MemberName(result, m, true); 829 } else if (++overflow >= overflow_limit) { 830 match_flags = 0; break; // got tired of looking at overflow 831 } 832 } 833 } 834 835 // return number of elements we at leasted wanted to initialize 836 return rfill + overflow; 837 } 838 839 840 // Decode this java.lang.Class object into an instanceKlass, if possible. 841 // Throw IAE if not 842 instanceKlassHandle MethodHandles::resolve_instance_klass(oop java_mirror_oop, TRAPS) { 843 instanceKlassHandle empty; 844 klassOop caller = NULL; 845 if (java_lang_Class::is_instance(java_mirror_oop)) { 846 caller = java_lang_Class::as_klassOop(java_mirror_oop); 847 } 848 if (caller == NULL || !Klass::cast(caller)->oop_is_instance()) { 849 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not a class", empty); 850 } 851 return instanceKlassHandle(THREAD, caller); 852 } 853 854 855 856 // Decode the vmtarget field of a method handle. 857 // Sanitize out methodOops, klassOops, and any other non-Java data. 858 // This is for debugging and reflection. 859 oop MethodHandles::encode_target(Handle mh, int format, TRAPS) { 860 assert(java_dyn_MethodHandle::is_instance(mh()), "must be a MH"); 861 if (format == ETF_HANDLE_OR_METHOD_NAME) { 862 oop target = java_dyn_MethodHandle::vmtarget(mh()); 863 if (target == NULL) { 864 return NULL; // unformed MH 865 } 866 klassOop tklass = target->klass(); 867 if (Klass::cast(tklass)->is_subclass_of(SystemDictionary::Object_klass())) { 868 return target; // target is another MH (or something else?) 869 } 870 } 871 if (format == ETF_DIRECT_HANDLE) { 872 oop target = mh(); 873 for (;;) { 874 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) { 875 return target; 876 } 877 if (!java_dyn_MethodHandle::is_instance(target)){ 878 return NULL; // unformed MH 879 } 880 target = java_dyn_MethodHandle::vmtarget(target); 881 } 882 } 883 // cases of metadata in MH.vmtarget: 884 // - AMH can have methodOop for static invoke with bound receiver 885 // - DMH can have methodOop for static invoke (on variable receiver) 886 // - DMH can have klassOop for dispatched (non-static) invoke 887 klassOop receiver_limit = NULL; 888 int decode_flags = 0; 889 methodOop m = decode_MethodHandle(mh(), receiver_limit, decode_flags); 890 if (m == NULL) return NULL; 891 switch (format) { 892 case ETF_REFLECT_METHOD: 893 // same as jni_ToReflectedMethod: 894 if (m->is_initializer()) { 895 return Reflection::new_constructor(m, THREAD); 896 } else { 897 return Reflection::new_method(m, UseNewReflection, false, THREAD); 898 } 899 900 case ETF_HANDLE_OR_METHOD_NAME: // method, not handle 901 case ETF_METHOD_NAME: 902 { 903 if (SystemDictionary::MemberName_klass() == NULL) break; 904 instanceKlassHandle mname_klass(THREAD, SystemDictionary::MemberName_klass()); 905 mname_klass->initialize(CHECK_NULL); 906 Handle mname = mname_klass->allocate_instance_handle(CHECK_NULL); 907 sun_dyn_MemberName::set_vmindex(mname(), VM_INDEX_UNINITIALIZED); 908 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0); 909 init_MemberName(mname(), m, do_dispatch); 910 expand_MemberName(mname, 0, CHECK_NULL); 911 return mname(); 912 } 913 } 914 915 // Unknown format code. 916 char msg[50]; 917 jio_snprintf(msg, sizeof(msg), "unknown getTarget format=%d", format); 918 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), msg); 919 } 920 921 static const char* always_null_names[] = { 922 "java/lang/Void", 923 "java/lang/Null", 924 //"java/lang/Nothing", 925 "sun/dyn/empty/Empty", 926 NULL 927 }; 928 929 static bool is_always_null_type(klassOop klass) { 930 if (!Klass::cast(klass)->oop_is_instance()) return false; 931 instanceKlass* ik = instanceKlass::cast(klass); 932 // Must be on the boot class path: 933 if (ik->class_loader() != NULL) return false; 934 // Check the name. 935 Symbol* name = ik->name(); 936 for (int i = 0; ; i++) { 937 const char* test_name = always_null_names[i]; 938 if (test_name == NULL) break; 939 if (name->equals(test_name)) 940 return true; 941 } 942 return false; 943 } 944 945 bool MethodHandles::class_cast_needed(klassOop src, klassOop dst) { 946 if (src == dst || dst == SystemDictionary::Object_klass()) 947 return false; // quickest checks 948 Klass* srck = Klass::cast(src); 949 Klass* dstk = Klass::cast(dst); 950 if (dstk->is_interface()) { 951 // interface receivers can safely be viewed as untyped, 952 // because interface calls always include a dynamic check 953 //dstk = Klass::cast(SystemDictionary::Object_klass()); 954 return false; 955 } 956 if (srck->is_interface()) { 957 // interface arguments must be viewed as untyped 958 //srck = Klass::cast(SystemDictionary::Object_klass()); 959 return true; 960 } 961 if (is_always_null_type(src)) { 962 // some source types are known to be never instantiated; 963 // they represent references which are always null 964 // such null references never fail to convert safely 965 return false; 966 } 967 return !srck->is_subclass_of(dstk->as_klassOop()); 968 } 969 970 static oop object_java_mirror() { 971 return Klass::cast(SystemDictionary::Object_klass())->java_mirror(); 972 } 973 974 bool MethodHandles::same_basic_type_for_arguments(BasicType src, 975 BasicType dst, 976 bool raw, 977 bool for_return) { 978 if (for_return) { 979 // return values can always be forgotten: 980 if (dst == T_VOID) return true; 981 if (src == T_VOID) return raw && (dst == T_INT); 982 // We allow caller to receive a garbage int, which is harmless. 983 // This trick is pulled by trusted code (see VerifyType.canPassRaw). 984 } 985 assert(src != T_VOID && dst != T_VOID, "should not be here"); 986 if (src == dst) return true; 987 if (type2size[src] != type2size[dst]) return false; 988 if (src == T_OBJECT || dst == T_OBJECT) return false; 989 if (raw) return true; // bitwise reinterpretation; caller guarantees safety 990 // allow reinterpretation casts for integral widening 991 if (is_subword_type(src)) { // subwords can fit in int or other subwords 992 if (dst == T_INT) // any subword fits in an int 993 return true; 994 if (src == T_BOOLEAN) // boolean fits in any subword 995 return is_subword_type(dst); 996 if (src == T_BYTE && dst == T_SHORT) 997 return true; // remaining case: byte fits in short 998 } 999 // allow float/fixed reinterpretation casts 1000 if (src == T_FLOAT) return dst == T_INT; 1001 if (src == T_INT) return dst == T_FLOAT; 1002 if (src == T_DOUBLE) return dst == T_LONG; 1003 if (src == T_LONG) return dst == T_DOUBLE; 1004 return false; 1005 } 1006 1007 const char* MethodHandles::check_method_receiver(methodOop m, 1008 klassOop passed_recv_type) { 1009 assert(!m->is_static(), "caller resp."); 1010 if (passed_recv_type == NULL) 1011 return "receiver type is primitive"; 1012 if (class_cast_needed(passed_recv_type, m->method_holder())) { 1013 Klass* formal = Klass::cast(m->method_holder()); 1014 return SharedRuntime::generate_class_cast_message("receiver type", 1015 formal->external_name()); 1016 } 1017 return NULL; // checks passed 1018 } 1019 1020 // Verify that m's signature can be called type-safely by a method handle 1021 // of the given method type 'mtype'. 1022 // It takes a TRAPS argument because it must perform symbol lookups. 1023 void MethodHandles::verify_method_signature(methodHandle m, 1024 Handle mtype, 1025 int first_ptype_pos, 1026 KlassHandle insert_ptype, 1027 TRAPS) { 1028 objArrayHandle ptypes(THREAD, java_dyn_MethodType::ptypes(mtype())); 1029 int pnum = first_ptype_pos; 1030 int pmax = ptypes->length(); 1031 int mnum = 0; // method argument 1032 const char* err = NULL; 1033 ResourceMark rm(THREAD); 1034 for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) { 1035 oop ptype_oop = NULL; 1036 if (ss.at_return_type()) { 1037 if (pnum != pmax) 1038 { err = "too many arguments"; break; } 1039 ptype_oop = java_dyn_MethodType::rtype(mtype()); 1040 } else { 1041 if (pnum >= pmax) 1042 { err = "not enough arguments"; break; } 1043 if (pnum >= 0) 1044 ptype_oop = ptypes->obj_at(pnum); 1045 else if (insert_ptype.is_null()) 1046 ptype_oop = NULL; 1047 else 1048 ptype_oop = insert_ptype->java_mirror(); 1049 pnum += 1; 1050 mnum += 1; 1051 } 1052 klassOop pklass = NULL; 1053 BasicType ptype = T_OBJECT; 1054 if (ptype_oop != NULL) 1055 ptype = java_lang_Class::as_BasicType(ptype_oop, &pklass); 1056 else 1057 // null does not match any non-reference; use Object to report the error 1058 pklass = SystemDictionary::Object_klass(); 1059 klassOop mklass = NULL; 1060 BasicType mtype = ss.type(); 1061 if (mtype == T_ARRAY) mtype = T_OBJECT; // fold all refs to T_OBJECT 1062 if (mtype == T_OBJECT) { 1063 if (ptype_oop == NULL) { 1064 // null matches any reference 1065 continue; 1066 } 1067 KlassHandle pklass_handle(THREAD, pklass); pklass = NULL; 1068 // If we fail to resolve types at this point, we will throw an error. 1069 Symbol* name = ss.as_symbol(CHECK); 1070 instanceKlass* mk = instanceKlass::cast(m->method_holder()); 1071 Handle loader(THREAD, mk->class_loader()); 1072 Handle domain(THREAD, mk->protection_domain()); 1073 mklass = SystemDictionary::resolve_or_null(name, loader, domain, CHECK); 1074 pklass = pklass_handle(); 1075 if (mklass == NULL && pklass != NULL && 1076 Klass::cast(pklass)->name() == name && 1077 m->is_method_handle_invoke()) { 1078 // Assume a match. We can't really decode the signature of MH.invoke*. 1079 continue; 1080 } 1081 } 1082 if (!ss.at_return_type()) { 1083 err = check_argument_type_change(ptype, pklass, mtype, mklass, mnum); 1084 } else { 1085 err = check_return_type_change(mtype, mklass, ptype, pklass); // note reversal! 1086 } 1087 if (err != NULL) break; 1088 } 1089 1090 if (err != NULL) { 1091 THROW_MSG(vmSymbols::java_lang_InternalError(), err); 1092 } 1093 } 1094 1095 // Main routine for verifying the MethodHandle.type of a proposed 1096 // direct or bound-direct method handle. 1097 void MethodHandles::verify_method_type(methodHandle m, 1098 Handle mtype, 1099 bool has_bound_recv, 1100 KlassHandle bound_recv_type, 1101 TRAPS) { 1102 bool m_needs_receiver = !m->is_static(); 1103 1104 const char* err = NULL; 1105 1106 int first_ptype_pos = m_needs_receiver ? 1 : 0; 1107 if (has_bound_recv) { 1108 first_ptype_pos -= 1; // ptypes do not include the bound argument; start earlier in them 1109 if (m_needs_receiver && bound_recv_type.is_null()) 1110 { err = "bound receiver is not an object"; goto die; } 1111 } 1112 1113 if (m_needs_receiver && err == NULL) { 1114 objArrayOop ptypes = java_dyn_MethodType::ptypes(mtype()); 1115 if (ptypes->length() < first_ptype_pos) 1116 { err = "receiver argument is missing"; goto die; } 1117 if (has_bound_recv) 1118 err = check_method_receiver(m(), bound_recv_type->as_klassOop()); 1119 else 1120 err = check_method_receiver(m(), java_lang_Class::as_klassOop(ptypes->obj_at(first_ptype_pos-1))); 1121 if (err != NULL) goto die; 1122 } 1123 1124 // Check the other arguments for mistypes. 1125 verify_method_signature(m, mtype, first_ptype_pos, bound_recv_type, CHECK); 1126 return; 1127 1128 die: 1129 THROW_MSG(vmSymbols::java_lang_InternalError(), err); 1130 } 1131 1132 void MethodHandles::verify_vmslots(Handle mh, TRAPS) { 1133 // Verify vmslots. 1134 int check_slots = argument_slot_count(java_dyn_MethodHandle::type(mh())); 1135 if (java_dyn_MethodHandle::vmslots(mh()) != check_slots) { 1136 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH"); 1137 } 1138 } 1139 1140 void MethodHandles::verify_vmargslot(Handle mh, int argnum, int argslot, TRAPS) { 1141 // Verify that argslot points at the given argnum. 1142 int check_slot = argument_slot(java_dyn_MethodHandle::type(mh()), argnum); 1143 if (argslot != check_slot || argslot < 0) { 1144 const char* fmt = "for argnum of %d, vmargslot is %d, should be %d"; 1145 size_t msglen = strlen(fmt) + 3*11 + 1; 1146 char* msg = NEW_RESOURCE_ARRAY(char, msglen); 1147 jio_snprintf(msg, msglen, fmt, argnum, argslot, check_slot); 1148 THROW_MSG(vmSymbols::java_lang_InternalError(), msg); 1149 } 1150 } 1151 1152 // Verify the correspondence between two method types. 1153 // Apart from the advertised changes, caller method type X must 1154 // be able to invoke the callee method Y type with no violations 1155 // of type integrity. 1156 // Return NULL if all is well, else a short error message. 1157 const char* MethodHandles::check_method_type_change(oop src_mtype, int src_beg, int src_end, 1158 int insert_argnum, oop insert_type, 1159 int change_argnum, oop change_type, 1160 int delete_argnum, 1161 oop dst_mtype, int dst_beg, int dst_end, 1162 bool raw) { 1163 objArrayOop src_ptypes = java_dyn_MethodType::ptypes(src_mtype); 1164 objArrayOop dst_ptypes = java_dyn_MethodType::ptypes(dst_mtype); 1165 1166 int src_max = src_ptypes->length(); 1167 int dst_max = dst_ptypes->length(); 1168 1169 if (src_end == -1) src_end = src_max; 1170 if (dst_end == -1) dst_end = dst_max; 1171 1172 assert(0 <= src_beg && src_beg <= src_end && src_end <= src_max, "oob"); 1173 assert(0 <= dst_beg && dst_beg <= dst_end && dst_end <= dst_max, "oob"); 1174 1175 // pending actions; set to -1 when done: 1176 int ins_idx = insert_argnum, chg_idx = change_argnum, del_idx = delete_argnum; 1177 1178 const char* err = NULL; 1179 1180 // Walk along each array of parameter types, including a virtual 1181 // NULL end marker at the end of each. 1182 for (int src_idx = src_beg, dst_idx = dst_beg; 1183 (src_idx <= src_end && dst_idx <= dst_end); 1184 src_idx++, dst_idx++) { 1185 oop src_type = (src_idx == src_end) ? oop(NULL) : src_ptypes->obj_at(src_idx); 1186 oop dst_type = (dst_idx == dst_end) ? oop(NULL) : dst_ptypes->obj_at(dst_idx); 1187 bool fix_null_src_type = false; 1188 1189 // Perform requested edits. 1190 if (ins_idx == src_idx) { 1191 // note that the inserted guy is never affected by a change or deletion 1192 ins_idx = -1; 1193 src_type = insert_type; 1194 fix_null_src_type = true; 1195 --src_idx; // back up to process src type on next loop 1196 src_idx = src_end; 1197 } else { 1198 // note that the changed guy can be immediately deleted 1199 if (chg_idx == src_idx) { 1200 chg_idx = -1; 1201 assert(src_idx < src_end, "oob"); 1202 src_type = change_type; 1203 fix_null_src_type = true; 1204 } 1205 if (del_idx == src_idx) { 1206 del_idx = -1; 1207 assert(src_idx < src_end, "oob"); 1208 --dst_idx; 1209 continue; // rerun loop after skipping this position 1210 } 1211 } 1212 1213 if (src_type == NULL && fix_null_src_type) 1214 // explicit null in this case matches any dest reference 1215 src_type = (java_lang_Class::is_primitive(dst_type) ? object_java_mirror() : dst_type); 1216 1217 // Compare the two argument types. 1218 if (src_type != dst_type) { 1219 if (src_type == NULL) return "not enough arguments"; 1220 if (dst_type == NULL) return "too many arguments"; 1221 err = check_argument_type_change(src_type, dst_type, dst_idx, raw); 1222 if (err != NULL) return err; 1223 } 1224 } 1225 1226 // Now compare return types also. 1227 oop src_rtype = java_dyn_MethodType::rtype(src_mtype); 1228 oop dst_rtype = java_dyn_MethodType::rtype(dst_mtype); 1229 if (src_rtype != dst_rtype) { 1230 err = check_return_type_change(dst_rtype, src_rtype, raw); // note reversal! 1231 if (err != NULL) return err; 1232 } 1233 1234 assert(err == NULL, ""); 1235 return NULL; // all is well 1236 } 1237 1238 1239 const char* MethodHandles::check_argument_type_change(BasicType src_type, 1240 klassOop src_klass, 1241 BasicType dst_type, 1242 klassOop dst_klass, 1243 int argnum, 1244 bool raw) { 1245 const char* err = NULL; 1246 bool for_return = (argnum < 0); 1247 1248 // just in case: 1249 if (src_type == T_ARRAY) src_type = T_OBJECT; 1250 if (dst_type == T_ARRAY) dst_type = T_OBJECT; 1251 1252 // Produce some nice messages if VerifyMethodHandles is turned on: 1253 if (!same_basic_type_for_arguments(src_type, dst_type, raw, for_return)) { 1254 if (src_type == T_OBJECT) { 1255 if (raw && dst_type == T_INT && is_always_null_type(src_klass)) 1256 return NULL; // OK to convert a null pointer to a garbage int 1257 err = ((argnum >= 0) 1258 ? "type mismatch: passing a %s for method argument #%d, which expects primitive %s" 1259 : "type mismatch: returning a %s, but caller expects primitive %s"); 1260 } else if (dst_type == T_OBJECT) { 1261 err = ((argnum >= 0) 1262 ? "type mismatch: passing a primitive %s for method argument #%d, which expects %s" 1263 : "type mismatch: returning a primitive %s, but caller expects %s"); 1264 } else { 1265 err = ((argnum >= 0) 1266 ? "type mismatch: passing a %s for method argument #%d, which expects %s" 1267 : "type mismatch: returning a %s, but caller expects %s"); 1268 } 1269 } else if (src_type == T_OBJECT && dst_type == T_OBJECT && 1270 class_cast_needed(src_klass, dst_klass)) { 1271 if (!class_cast_needed(dst_klass, src_klass)) { 1272 if (raw) 1273 return NULL; // reverse cast is OK; the MH target is trusted to enforce it 1274 err = ((argnum >= 0) 1275 ? "cast required: passing a %s for method argument #%d, which expects %s" 1276 : "cast required: returning a %s, but caller expects %s"); 1277 } else { 1278 err = ((argnum >= 0) 1279 ? "reference mismatch: passing a %s for method argument #%d, which expects %s" 1280 : "reference mismatch: returning a %s, but caller expects %s"); 1281 } 1282 } else { 1283 // passed the obstacle course 1284 return NULL; 1285 } 1286 1287 // format, format, format 1288 const char* src_name = type2name(src_type); 1289 const char* dst_name = type2name(dst_type); 1290 if (src_type == T_OBJECT) src_name = Klass::cast(src_klass)->external_name(); 1291 if (dst_type == T_OBJECT) dst_name = Klass::cast(dst_klass)->external_name(); 1292 if (src_name == NULL) src_name = "unknown type"; 1293 if (dst_name == NULL) dst_name = "unknown type"; 1294 1295 size_t msglen = strlen(err) + strlen(src_name) + strlen(dst_name) + (argnum < 10 ? 1 : 11); 1296 char* msg = NEW_RESOURCE_ARRAY(char, msglen + 1); 1297 if (argnum >= 0) { 1298 assert(strstr(err, "%d") != NULL, ""); 1299 jio_snprintf(msg, msglen, err, src_name, argnum, dst_name); 1300 } else { 1301 assert(strstr(err, "%d") == NULL, ""); 1302 jio_snprintf(msg, msglen, err, src_name, dst_name); 1303 } 1304 return msg; 1305 } 1306 1307 // Compute the depth within the stack of the given argument, i.e., 1308 // the combined size of arguments to the right of the given argument. 1309 // For the last argument (ptypes.length-1) this will be zero. 1310 // For the first argument (0) this will be the size of all 1311 // arguments but that one. For the special number -1, this 1312 // will be the size of all arguments, including the first. 1313 // If the argument is neither -1 nor a valid argument index, 1314 // then return a negative number. Otherwise, the result 1315 // is in the range [0..vmslots] inclusive. 1316 int MethodHandles::argument_slot(oop method_type, int arg) { 1317 objArrayOop ptypes = java_dyn_MethodType::ptypes(method_type); 1318 int argslot = 0; 1319 int len = ptypes->length(); 1320 if (arg < -1 || arg >= len) return -99; 1321 for (int i = len-1; i > arg; i--) { 1322 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i)); 1323 argslot += type2size[bt]; 1324 } 1325 assert(argument_slot_to_argnum(method_type, argslot) == arg, "inverse works"); 1326 return argslot; 1327 } 1328 1329 // Given a slot number, return the argument number. 1330 int MethodHandles::argument_slot_to_argnum(oop method_type, int query_argslot) { 1331 objArrayOop ptypes = java_dyn_MethodType::ptypes(method_type); 1332 int argslot = 0; 1333 int len = ptypes->length(); 1334 for (int i = len-1; i >= 0; i--) { 1335 if (query_argslot == argslot) return i; 1336 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i)); 1337 argslot += type2size[bt]; 1338 } 1339 // return pseudo-arg deepest in stack: 1340 if (query_argslot == argslot) return -1; 1341 return -99; // oob slot, or splitting a double-slot arg 1342 } 1343 1344 methodHandle MethodHandles::dispatch_decoded_method(methodHandle m, 1345 KlassHandle receiver_limit, 1346 int decode_flags, 1347 KlassHandle receiver_klass, 1348 TRAPS) { 1349 assert((decode_flags & ~_DMF_DIRECT_MASK) == 0, "must be direct method reference"); 1350 assert((decode_flags & _dmf_has_receiver) != 0, "must have a receiver or first reference argument"); 1351 1352 if (!m->is_static() && 1353 (receiver_klass.is_null() || !receiver_klass->is_subtype_of(m->method_holder()))) 1354 // given type does not match class of method, or receiver is null! 1355 // caller should have checked this, but let's be extra careful... 1356 return methodHandle(); 1357 1358 if (receiver_limit.not_null() && 1359 (receiver_klass.not_null() && !receiver_klass->is_subtype_of(receiver_limit()))) 1360 // given type is not limited to the receiver type 1361 // note that a null receiver can match any reference value, for a static method 1362 return methodHandle(); 1363 1364 if (!(decode_flags & MethodHandles::_dmf_does_dispatch)) { 1365 // pre-dispatched or static method (null receiver is OK for static) 1366 return m; 1367 1368 } else if (receiver_klass.is_null()) { 1369 // null receiver value; cannot dispatch 1370 return methodHandle(); 1371 1372 } else if (!(decode_flags & MethodHandles::_dmf_from_interface)) { 1373 // perform virtual dispatch 1374 int vtable_index = m->vtable_index(); 1375 guarantee(vtable_index >= 0, "valid vtable index"); 1376 1377 // receiver_klass might be an arrayKlassOop but all vtables start at 1378 // the same place. The cast is to avoid virtual call and assertion. 1379 // See also LinkResolver::runtime_resolve_virtual_method. 1380 instanceKlass* inst = (instanceKlass*)Klass::cast(receiver_klass()); 1381 DEBUG_ONLY(inst->verify_vtable_index(vtable_index)); 1382 methodOop m_oop = inst->method_at_vtable(vtable_index); 1383 return methodHandle(THREAD, m_oop); 1384 1385 } else { 1386 // perform interface dispatch 1387 int itable_index = klassItable::compute_itable_index(m()); 1388 guarantee(itable_index >= 0, "valid itable index"); 1389 instanceKlass* inst = instanceKlass::cast(receiver_klass()); 1390 methodOop m_oop = inst->method_at_itable(m->method_holder(), itable_index, THREAD); 1391 return methodHandle(THREAD, m_oop); 1392 } 1393 } 1394 1395 void MethodHandles::verify_DirectMethodHandle(Handle mh, methodHandle m, TRAPS) { 1396 // Verify type. 1397 Handle mtype(THREAD, java_dyn_MethodHandle::type(mh())); 1398 verify_method_type(m, mtype, false, KlassHandle(), CHECK); 1399 1400 // Verify vmslots. 1401 if (java_dyn_MethodHandle::vmslots(mh()) != m->size_of_parameters()) { 1402 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in DMH"); 1403 } 1404 } 1405 1406 void MethodHandles::init_DirectMethodHandle(Handle mh, methodHandle m, bool do_dispatch, TRAPS) { 1407 // Check arguments. 1408 if (mh.is_null() || m.is_null() || 1409 (!do_dispatch && m->is_abstract())) { 1410 THROW(vmSymbols::java_lang_InternalError()); 1411 } 1412 1413 java_dyn_MethodHandle::init_vmslots(mh()); 1414 1415 if (VerifyMethodHandles) { 1416 // The privileged code which invokes this routine should not make 1417 // a mistake about types, but it's better to verify. 1418 verify_DirectMethodHandle(mh, m, CHECK); 1419 } 1420 1421 // Finally, after safety checks are done, link to the target method. 1422 // We will follow the same path as the latter part of 1423 // InterpreterRuntime::resolve_invoke(), which first finds the method 1424 // and then decides how to populate the constant pool cache entry 1425 // that links the interpreter calls to the method. We need the same 1426 // bits, and will use the same calling sequence code. 1427 1428 int vmindex = methodOopDesc::garbage_vtable_index; 1429 oop vmtarget = NULL; 1430 1431 instanceKlass::cast(m->method_holder())->link_class(CHECK); 1432 1433 MethodHandleEntry* me = NULL; 1434 if (do_dispatch && Klass::cast(m->method_holder())->is_interface()) { 1435 // We are simulating an invokeinterface instruction. 1436 // (We might also be simulating an invokevirtual on a miranda method, 1437 // but it is safe to treat it as an invokeinterface.) 1438 assert(!m->can_be_statically_bound(), "no final methods on interfaces"); 1439 vmindex = klassItable::compute_itable_index(m()); 1440 assert(vmindex >= 0, "(>=0) == do_dispatch"); 1441 // Set up same bits as ConstantPoolCacheEntry::set_interface_call(). 1442 vmtarget = m->method_holder(); // the interface 1443 me = MethodHandles::entry(MethodHandles::_invokeinterface_mh); 1444 } else if (!do_dispatch || m->can_be_statically_bound()) { 1445 // We are simulating an invokestatic or invokespecial instruction. 1446 // Set up the method pointer, just like ConstantPoolCacheEntry::set_method(). 1447 vmtarget = m(); 1448 // this does not help dispatch, but it will make it possible to parse this MH: 1449 vmindex = methodOopDesc::nonvirtual_vtable_index; 1450 assert(vmindex < 0, "(>=0) == do_dispatch"); 1451 if (!m->is_static()) { 1452 me = MethodHandles::entry(MethodHandles::_invokespecial_mh); 1453 } else { 1454 me = MethodHandles::entry(MethodHandles::_invokestatic_mh); 1455 // Part of the semantics of a static call is an initialization barrier. 1456 // For a DMH, it is done now, when the handle is created. 1457 Klass* k = Klass::cast(m->method_holder()); 1458 if (k->should_be_initialized()) { 1459 k->initialize(CHECK); 1460 } 1461 } 1462 } else { 1463 // We are simulating an invokevirtual instruction. 1464 // Set up the vtable index, just like ConstantPoolCacheEntry::set_method(). 1465 // The key logic is LinkResolver::runtime_resolve_virtual_method. 1466 vmindex = m->vtable_index(); 1467 vmtarget = m->method_holder(); 1468 me = MethodHandles::entry(MethodHandles::_invokevirtual_mh); 1469 } 1470 1471 if (me == NULL) { THROW(vmSymbols::java_lang_InternalError()); } 1472 1473 sun_dyn_DirectMethodHandle::set_vmtarget(mh(), vmtarget); 1474 sun_dyn_DirectMethodHandle::set_vmindex(mh(), vmindex); 1475 DEBUG_ONLY(int flags; klassOop rlimit); 1476 assert(MethodHandles::decode_method(mh(), rlimit, flags) == m(), 1477 "properly stored for later decoding"); 1478 DEBUG_ONLY(bool actual_do_dispatch = ((flags & _dmf_does_dispatch) != 0)); 1479 assert(!(actual_do_dispatch && !do_dispatch), 1480 "do not perform dispatch if !do_dispatch specified"); 1481 assert(actual_do_dispatch == (vmindex >= 0), "proper later decoding of do_dispatch"); 1482 assert(decode_MethodHandle_stack_pushes(mh()) == 0, "DMH does not move stack"); 1483 1484 // Done! 1485 java_dyn_MethodHandle::set_vmentry(mh(), me); 1486 } 1487 1488 void MethodHandles::verify_BoundMethodHandle_with_receiver(Handle mh, 1489 methodHandle m, 1490 TRAPS) { 1491 // Verify type. 1492 oop receiver = sun_dyn_BoundMethodHandle::argument(mh()); 1493 Handle mtype(THREAD, java_dyn_MethodHandle::type(mh())); 1494 KlassHandle bound_recv_type; 1495 if (receiver != NULL) bound_recv_type = KlassHandle(THREAD, receiver->klass()); 1496 verify_method_type(m, mtype, true, bound_recv_type, CHECK); 1497 1498 int receiver_pos = m->size_of_parameters() - 1; 1499 1500 // Verify MH.vmargslot, which should point at the bound receiver. 1501 verify_vmargslot(mh, -1, sun_dyn_BoundMethodHandle::vmargslot(mh()), CHECK); 1502 //verify_vmslots(mh, CHECK); 1503 1504 // Verify vmslots. 1505 if (java_dyn_MethodHandle::vmslots(mh()) != receiver_pos) { 1506 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH (receiver)"); 1507 } 1508 } 1509 1510 // Initialize a BMH with a receiver bound directly to a methodOop. 1511 void MethodHandles::init_BoundMethodHandle_with_receiver(Handle mh, 1512 methodHandle original_m, 1513 KlassHandle receiver_limit, 1514 int decode_flags, 1515 TRAPS) { 1516 // Check arguments. 1517 if (mh.is_null() || original_m.is_null()) { 1518 THROW(vmSymbols::java_lang_InternalError()); 1519 } 1520 1521 KlassHandle receiver_klass; 1522 { 1523 oop receiver_oop = sun_dyn_BoundMethodHandle::argument(mh()); 1524 if (receiver_oop != NULL) 1525 receiver_klass = KlassHandle(THREAD, receiver_oop->klass()); 1526 } 1527 methodHandle m = dispatch_decoded_method(original_m, 1528 receiver_limit, decode_flags, 1529 receiver_klass, 1530 CHECK); 1531 if (m.is_null()) { THROW(vmSymbols::java_lang_InternalError()); } 1532 if (m->is_abstract()) { THROW(vmSymbols::java_lang_AbstractMethodError()); } 1533 1534 java_dyn_MethodHandle::init_vmslots(mh()); 1535 1536 if (VerifyMethodHandles) { 1537 verify_BoundMethodHandle_with_receiver(mh, m, CHECK); 1538 } 1539 1540 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), m()); 1541 1542 DEBUG_ONLY(int junk; klassOop junk2); 1543 assert(MethodHandles::decode_method(mh(), junk2, junk) == m(), "properly stored for later decoding"); 1544 assert(decode_MethodHandle_stack_pushes(mh()) == 1, "BMH pushes one stack slot"); 1545 1546 // Done! 1547 java_dyn_MethodHandle::set_vmentry(mh(), MethodHandles::entry(MethodHandles::_bound_ref_direct_mh)); 1548 } 1549 1550 void MethodHandles::verify_BoundMethodHandle(Handle mh, Handle target, int argnum, 1551 bool direct_to_method, TRAPS) { 1552 Handle ptype_handle(THREAD, 1553 java_dyn_MethodType::ptype(java_dyn_MethodHandle::type(target()), argnum)); 1554 KlassHandle ptype_klass; 1555 BasicType ptype = java_lang_Class::as_BasicType(ptype_handle(), &ptype_klass); 1556 int slots_pushed = type2size[ptype]; 1557 1558 oop argument = sun_dyn_BoundMethodHandle::argument(mh()); 1559 1560 const char* err = NULL; 1561 1562 switch (ptype) { 1563 case T_OBJECT: 1564 if (argument != NULL) 1565 // we must implicitly convert from the arg type to the outgoing ptype 1566 err = check_argument_type_change(T_OBJECT, argument->klass(), ptype, ptype_klass(), argnum); 1567 break; 1568 1569 case T_ARRAY: case T_VOID: 1570 assert(false, "array, void do not appear here"); 1571 default: 1572 if (ptype != T_INT && !is_subword_type(ptype)) { 1573 err = "unexpected parameter type"; 1574 break; 1575 } 1576 // check subrange of Integer.value, if necessary 1577 if (argument == NULL || argument->klass() != SystemDictionary::Integer_klass()) { 1578 err = "bound integer argument must be of type java.lang.Integer"; 1579 break; 1580 } 1581 if (ptype != T_INT) { 1582 int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_INT); 1583 jint value = argument->int_field(value_offset); 1584 int vminfo = adapter_unbox_subword_vminfo(ptype); 1585 jint subword = truncate_subword_from_vminfo(value, vminfo); 1586 if (value != subword) { 1587 err = "bound subword value does not fit into the subword type"; 1588 break; 1589 } 1590 } 1591 break; 1592 case T_FLOAT: 1593 case T_DOUBLE: 1594 case T_LONG: 1595 { 1596 // we must implicitly convert from the unboxed arg type to the outgoing ptype 1597 BasicType argbox = java_lang_boxing_object::basic_type(argument); 1598 if (argbox != ptype) { 1599 err = check_argument_type_change(T_OBJECT, (argument == NULL 1600 ? SystemDictionary::Object_klass() 1601 : argument->klass()), 1602 ptype, ptype_klass(), argnum); 1603 assert(err != NULL, "this must be an error"); 1604 } 1605 break; 1606 } 1607 } 1608 1609 if (err == NULL) { 1610 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh())); 1611 if (direct_to_method) { 1612 assert(this_pushes == slots_pushed, "BMH pushes one or two stack slots"); 1613 assert(slots_pushed <= MethodHandlePushLimit, ""); 1614 } else { 1615 int target_pushes = decode_MethodHandle_stack_pushes(target()); 1616 assert(this_pushes == slots_pushed + target_pushes, "BMH stack motion must be correct"); 1617 // do not blow the stack; use a Java-based adapter if this limit is exceeded 1618 // FIXME 1619 // if (slots_pushed + target_pushes > MethodHandlePushLimit) 1620 // err = "too many bound parameters"; 1621 } 1622 } 1623 1624 if (err == NULL) { 1625 // Verify the rest of the method type. 1626 err = check_method_type_insertion(java_dyn_MethodHandle::type(mh()), 1627 argnum, ptype_handle(), 1628 java_dyn_MethodHandle::type(target())); 1629 } 1630 1631 if (err != NULL) { 1632 THROW_MSG(vmSymbols::java_lang_InternalError(), err); 1633 } 1634 } 1635 1636 void MethodHandles::init_BoundMethodHandle(Handle mh, Handle target, int argnum, TRAPS) { 1637 // Check arguments. 1638 if (mh.is_null() || target.is_null() || !java_dyn_MethodHandle::is_instance(target())) { 1639 THROW(vmSymbols::java_lang_InternalError()); 1640 } 1641 1642 java_dyn_MethodHandle::init_vmslots(mh()); 1643 1644 if (VerifyMethodHandles) { 1645 int insert_after = argnum - 1; 1646 verify_vmargslot(mh, insert_after, sun_dyn_BoundMethodHandle::vmargslot(mh()), CHECK); 1647 verify_vmslots(mh, CHECK); 1648 } 1649 1650 // Get bound type and required slots. 1651 oop ptype_oop = java_dyn_MethodType::ptype(java_dyn_MethodHandle::type(target()), argnum); 1652 BasicType ptype = java_lang_Class::as_BasicType(ptype_oop); 1653 int slots_pushed = type2size[ptype]; 1654 1655 // If (a) the target is a direct non-dispatched method handle, 1656 // or (b) the target is a dispatched direct method handle and we 1657 // are binding the receiver, cut out the middle-man. 1658 // Do this by decoding the DMH and using its methodOop directly as vmtarget. 1659 bool direct_to_method = false; 1660 if (OptimizeMethodHandles && 1661 target->klass() == SystemDictionary::DirectMethodHandle_klass() && 1662 (argnum == 0 || sun_dyn_DirectMethodHandle::vmindex(target()) < 0)) { 1663 int decode_flags = 0; klassOop receiver_limit_oop = NULL; 1664 methodHandle m(THREAD, decode_method(target(), receiver_limit_oop, decode_flags)); 1665 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "DMH failed to decode"); } 1666 DEBUG_ONLY(int m_vmslots = m->size_of_parameters() - slots_pushed); // pos. of 1st arg. 1667 assert(sun_dyn_BoundMethodHandle::vmslots(mh()) == m_vmslots, "type w/ m sig"); 1668 if (argnum == 0 && (decode_flags & _dmf_has_receiver) != 0) { 1669 KlassHandle receiver_limit(THREAD, receiver_limit_oop); 1670 init_BoundMethodHandle_with_receiver(mh, m, 1671 receiver_limit, decode_flags, 1672 CHECK); 1673 return; 1674 } 1675 1676 // Even if it is not a bound receiver, we still might be able 1677 // to bind another argument and still invoke the methodOop directly. 1678 if (!(decode_flags & _dmf_does_dispatch)) { 1679 direct_to_method = true; 1680 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), m()); 1681 } 1682 } 1683 if (!direct_to_method) 1684 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), target()); 1685 1686 if (VerifyMethodHandles) { 1687 verify_BoundMethodHandle(mh, target, argnum, direct_to_method, CHECK); 1688 } 1689 1690 // Next question: Is this a ref, int, or long bound value? 1691 MethodHandleEntry* me = NULL; 1692 if (ptype == T_OBJECT) { 1693 if (direct_to_method) me = MethodHandles::entry(_bound_ref_direct_mh); 1694 else me = MethodHandles::entry(_bound_ref_mh); 1695 } else if (slots_pushed == 2) { 1696 if (direct_to_method) me = MethodHandles::entry(_bound_long_direct_mh); 1697 else me = MethodHandles::entry(_bound_long_mh); 1698 } else if (slots_pushed == 1) { 1699 if (direct_to_method) me = MethodHandles::entry(_bound_int_direct_mh); 1700 else me = MethodHandles::entry(_bound_int_mh); 1701 } else { 1702 assert(false, ""); 1703 } 1704 1705 // Done! 1706 java_dyn_MethodHandle::set_vmentry(mh(), me); 1707 } 1708 1709 static void throw_InternalError_for_bad_conversion(int conversion, const char* err, TRAPS) { 1710 char msg[200]; 1711 jio_snprintf(msg, sizeof(msg), "bad adapter (conversion=0x%08x): %s", conversion, err); 1712 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), msg); 1713 } 1714 1715 void MethodHandles::verify_AdapterMethodHandle(Handle mh, int argnum, TRAPS) { 1716 jint conversion = sun_dyn_AdapterMethodHandle::conversion(mh()); 1717 int argslot = sun_dyn_AdapterMethodHandle::vmargslot(mh()); 1718 1719 verify_vmargslot(mh, argnum, argslot, CHECK); 1720 verify_vmslots(mh, CHECK); 1721 1722 jint conv_op = adapter_conversion_op(conversion); 1723 if (!conv_op_valid(conv_op)) { 1724 throw_InternalError_for_bad_conversion(conversion, "unknown conversion op", THREAD); 1725 return; 1726 } 1727 EntryKind ek = adapter_entry_kind(conv_op); 1728 1729 int stack_move = adapter_conversion_stack_move(conversion); 1730 BasicType src = adapter_conversion_src_type(conversion); 1731 BasicType dest = adapter_conversion_dest_type(conversion); 1732 int vminfo = adapter_conversion_vminfo(conversion); // should be zero 1733 1734 Handle argument(THREAD, sun_dyn_AdapterMethodHandle::argument(mh())); 1735 Handle target(THREAD, sun_dyn_AdapterMethodHandle::vmtarget(mh())); 1736 Handle src_mtype(THREAD, java_dyn_MethodHandle::type(mh())); 1737 Handle dst_mtype(THREAD, java_dyn_MethodHandle::type(target())); 1738 1739 const char* err = NULL; 1740 1741 if (err == NULL) { 1742 // Check that the correct argument is supplied, but only if it is required. 1743 switch (ek) { 1744 case _adapter_check_cast: // target type of cast 1745 case _adapter_ref_to_prim: // wrapper type from which to unbox 1746 case _adapter_prim_to_ref: // wrapper type to box into 1747 case _adapter_collect_args: // array type to collect into 1748 case _adapter_spread_args: // array type to spread from 1749 if (!java_lang_Class::is_instance(argument()) 1750 || java_lang_Class::is_primitive(argument())) 1751 { err = "adapter requires argument of type java.lang.Class"; break; } 1752 if (ek == _adapter_collect_args || 1753 ek == _adapter_spread_args) { 1754 // Make sure it is a suitable collection type. (Array, for now.) 1755 Klass* ak = Klass::cast(java_lang_Class::as_klassOop(argument())); 1756 if (!ak->oop_is_objArray()) { 1757 { err = "adapter requires argument of type java.lang.Class<Object[]>"; break; } 1758 } 1759 } 1760 break; 1761 case _adapter_flyby: 1762 case _adapter_ricochet: 1763 if (!java_dyn_MethodHandle::is_instance(argument())) 1764 { err = "MethodHandle adapter argument required"; break; } 1765 break; 1766 default: 1767 if (argument.not_null()) 1768 { err = "adapter has spurious argument"; break; } 1769 break; 1770 } 1771 } 1772 1773 if (err == NULL) { 1774 // Check that the src/dest types are supplied if needed. 1775 switch (ek) { 1776 case _adapter_check_cast: 1777 if (src != T_OBJECT || dest != T_OBJECT) { 1778 err = "adapter requires object src/dest conversion subfields"; 1779 } 1780 break; 1781 case _adapter_prim_to_prim: 1782 if (!is_java_primitive(src) || !is_java_primitive(dest) || src == dest) { 1783 err = "adapter requires primitive src/dest conversion subfields"; break; 1784 } 1785 if ( (src == T_FLOAT || src == T_DOUBLE) && !(dest == T_FLOAT || dest == T_DOUBLE) || 1786 !(src == T_FLOAT || src == T_DOUBLE) && (dest == T_FLOAT || dest == T_DOUBLE)) { 1787 err = "adapter cannot convert beween floating and fixed-point"; break; 1788 } 1789 break; 1790 case _adapter_ref_to_prim: 1791 if (src != T_OBJECT || !is_java_primitive(dest) 1792 || argument() != Klass::cast(SystemDictionary::box_klass(dest))->java_mirror()) { 1793 err = "adapter requires primitive dest conversion subfield"; break; 1794 } 1795 break; 1796 case _adapter_prim_to_ref: 1797 if (!is_java_primitive(src) || dest != T_OBJECT 1798 || argument() != Klass::cast(SystemDictionary::box_klass(src))->java_mirror()) { 1799 err = "adapter requires primitive src conversion subfield"; break; 1800 } 1801 break; 1802 case _adapter_swap_args: 1803 case _adapter_rot_args: 1804 { 1805 if (!src || src != dest) { 1806 err = "adapter requires src/dest conversion subfields for swap"; break; 1807 } 1808 int swap_size = type2size[src]; 1809 oop src_mtype = sun_dyn_AdapterMethodHandle::type(mh()); 1810 oop dest_mtype = sun_dyn_AdapterMethodHandle::type(target()); 1811 int slot_limit = sun_dyn_AdapterMethodHandle::vmslots(target()); 1812 int src_slot = argslot; 1813 int dest_slot = vminfo; 1814 bool rotate_up = (src_slot > dest_slot); // upward rotation 1815 int src_arg = argnum; 1816 int dest_arg = argument_slot_to_argnum(dest_mtype, dest_slot); 1817 verify_vmargslot(mh, dest_arg, dest_slot, CHECK); 1818 if (!(dest_slot >= src_slot + swap_size) && 1819 !(src_slot >= dest_slot + swap_size)) { 1820 err = "source, destination slots must be distinct"; 1821 } else if (ek == _adapter_swap_args && !(src_slot > dest_slot)) { 1822 err = "source of swap must be deeper in stack"; 1823 } else if (ek == _adapter_swap_args) { 1824 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, dest_arg), 1825 java_dyn_MethodType::ptype(dest_mtype, src_arg), 1826 dest_arg); 1827 } else if (ek == _adapter_rot_args) { 1828 if (rotate_up) { 1829 assert((src_slot > dest_slot) && (src_arg < dest_arg), ""); 1830 // rotate up: [dest_slot..src_slot-ss] --> [dest_slot+ss..src_slot] 1831 // that is: [src_arg+1..dest_arg] --> [src_arg..dest_arg-1] 1832 for (int i = src_arg+1; i <= dest_arg && err == NULL; i++) { 1833 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, i), 1834 java_dyn_MethodType::ptype(dest_mtype, i-1), 1835 i); 1836 } 1837 } else { // rotate down 1838 assert((src_slot < dest_slot) && (src_arg > dest_arg), ""); 1839 // rotate down: [src_slot+ss..dest_slot] --> [src_slot..dest_slot-ss] 1840 // that is: [dest_arg..src_arg-1] --> [dst_arg+1..src_arg] 1841 for (int i = dest_arg; i <= src_arg-1 && err == NULL; i++) { 1842 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, i), 1843 java_dyn_MethodType::ptype(dest_mtype, i+1), 1844 i); 1845 } 1846 } 1847 } 1848 if (err == NULL) 1849 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, src_arg), 1850 java_dyn_MethodType::ptype(dest_mtype, dest_arg), 1851 src_arg); 1852 } 1853 break; 1854 case _adapter_collect_args: 1855 case _adapter_spread_args: 1856 { 1857 BasicType coll_type = (ek == _adapter_collect_args) ? dest : src; 1858 BasicType elem_type = (ek == _adapter_collect_args) ? src : dest; 1859 if (coll_type != T_OBJECT || elem_type != T_OBJECT) { 1860 err = "adapter requires src/dest subfields"; break; 1861 // later: 1862 // - consider making coll be a primitive array 1863 // - consider making coll be a heterogeneous collection 1864 } 1865 } 1866 break; 1867 default: 1868 if (src != 0 || dest != 0) { 1869 err = "adapter has spurious src/dest conversion subfields"; break; 1870 } 1871 break; 1872 } 1873 } 1874 1875 if (err == NULL) { 1876 // Check the stack_move subfield. 1877 // It must always report the net change in stack size, positive or negative. 1878 int slots_pushed = stack_move / stack_move_unit(); 1879 switch (ek) { 1880 case _adapter_prim_to_prim: 1881 case _adapter_ref_to_prim: 1882 case _adapter_prim_to_ref: 1883 if (slots_pushed != type2size[dest] - type2size[src]) { 1884 err = "wrong stack motion for primitive conversion"; 1885 } 1886 break; 1887 case _adapter_dup_args: 1888 if (slots_pushed <= 0) { 1889 err = "adapter requires conversion subfield slots_pushed > 0"; 1890 } 1891 break; 1892 case _adapter_drop_args: 1893 if (slots_pushed >= 0) { 1894 err = "adapter requires conversion subfield slots_pushed < 0"; 1895 } 1896 break; 1897 case _adapter_collect_args: 1898 if (slots_pushed > 1) { 1899 err = "adapter requires conversion subfield slots_pushed <= 1"; 1900 } 1901 break; 1902 case _adapter_spread_args: 1903 if (slots_pushed < -1) { 1904 err = "adapter requires conversion subfield slots_pushed >= -1"; 1905 } 1906 break; 1907 default: 1908 if (stack_move != 0) { 1909 err = "adapter has spurious stack_move conversion subfield"; 1910 } 1911 break; 1912 } 1913 if (err == NULL && stack_move != slots_pushed * stack_move_unit()) { 1914 err = "stack_move conversion subfield must be multiple of stack_move_unit"; 1915 } 1916 } 1917 1918 if (err == NULL) { 1919 // Make sure this adapter does not push too deeply. 1920 int slots_pushed = stack_move / stack_move_unit(); 1921 int this_vmslots = java_dyn_MethodHandle::vmslots(mh()); 1922 int target_vmslots = java_dyn_MethodHandle::vmslots(target()); 1923 if (slots_pushed != (target_vmslots - this_vmslots)) { 1924 err = "stack_move inconsistent with previous and current MethodType vmslots"; 1925 } else if (slots_pushed > 0) { 1926 // verify stack_move against MethodHandlePushLimit 1927 int target_pushes = decode_MethodHandle_stack_pushes(target()); 1928 // do not blow the stack; use a Java-based adapter if this limit is exceeded 1929 if (slots_pushed + target_pushes > MethodHandlePushLimit) { 1930 err = "adapter pushes too many parameters"; 1931 } 1932 } 1933 1934 // While we're at it, check that the stack motion decoder works: 1935 DEBUG_ONLY(int target_pushes = decode_MethodHandle_stack_pushes(target())); 1936 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh())); 1937 assert(this_pushes == slots_pushed + target_pushes, "AMH stack motion must be correct"); 1938 } 1939 1940 if (err == NULL && vminfo != 0) { 1941 switch (ek) { 1942 case _adapter_swap_args: 1943 case _adapter_rot_args: 1944 break; // OK 1945 default: 1946 err = "vminfo subfield is reserved to the JVM"; 1947 } 1948 } 1949 1950 // Do additional ad hoc checks. 1951 if (err == NULL) { 1952 switch (ek) { 1953 case _adapter_retype_only: 1954 err = check_method_type_passthrough(src_mtype(), dst_mtype(), false); 1955 break; 1956 1957 case _adapter_retype_raw: 1958 err = check_method_type_passthrough(src_mtype(), dst_mtype(), true); 1959 break; 1960 1961 case _adapter_check_cast: 1962 { 1963 // The actual value being checked must be a reference: 1964 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype(), argnum), 1965 object_java_mirror(), argnum); 1966 if (err != NULL) break; 1967 1968 // The output of the cast must fit with the destination argument: 1969 Handle cast_class = argument; 1970 err = check_method_type_conversion(src_mtype(), 1971 argnum, cast_class(), 1972 dst_mtype()); 1973 } 1974 break; 1975 1976 // %%% TO DO: continue in remaining cases to verify src/dst_mtype if VerifyMethodHandles 1977 } 1978 } 1979 1980 if (err != NULL) { 1981 throw_InternalError_for_bad_conversion(conversion, err, THREAD); 1982 return; 1983 } 1984 1985 } 1986 1987 void MethodHandles::init_AdapterMethodHandle(Handle mh, Handle target, int argnum, TRAPS) { 1988 oop argument = sun_dyn_AdapterMethodHandle::argument(mh()); 1989 int argslot = sun_dyn_AdapterMethodHandle::vmargslot(mh()); 1990 jint conversion = sun_dyn_AdapterMethodHandle::conversion(mh()); 1991 jint conv_op = adapter_conversion_op(conversion); 1992 1993 // adjust the adapter code to the internal EntryKind enumeration: 1994 EntryKind ek_orig = adapter_entry_kind(conv_op); 1995 EntryKind ek_opt = ek_orig; // may be optimized 1996 1997 // Finalize the vmtarget field (Java initialized it to null). 1998 if (!java_dyn_MethodHandle::is_instance(target())) { 1999 throw_InternalError_for_bad_conversion(conversion, "bad target", THREAD); 2000 return; 2001 } 2002 sun_dyn_AdapterMethodHandle::set_vmtarget(mh(), target()); 2003 2004 if (VerifyMethodHandles) { 2005 verify_AdapterMethodHandle(mh, argnum, CHECK); 2006 } 2007 2008 int stack_move = adapter_conversion_stack_move(conversion); 2009 BasicType src = adapter_conversion_src_type(conversion); 2010 BasicType dest = adapter_conversion_dest_type(conversion); 2011 int vminfo = adapter_conversion_vminfo(conversion); // should be zero 2012 2013 const char* err = NULL; 2014 2015 // Now it's time to finish the case analysis and pick a MethodHandleEntry. 2016 switch (ek_orig) { 2017 case _adapter_retype_only: 2018 case _adapter_retype_raw: 2019 case _adapter_check_cast: 2020 case _adapter_dup_args: 2021 case _adapter_drop_args: 2022 // these work fine via general case code 2023 break; 2024 2025 case _adapter_prim_to_prim: 2026 { 2027 // Non-subword cases are {int,float,long,double} -> {int,float,long,double}. 2028 // And, the {float,double} -> {int,long} cases must be handled by Java. 2029 switch (type2size[src] *4+ type2size[dest]) { 2030 case 1 *4+ 1: 2031 assert(src == T_INT || is_subword_type(src), "source is not float"); 2032 // Subword-related cases are int -> {boolean,byte,char,short}. 2033 ek_opt = _adapter_opt_i2i; 2034 vminfo = adapter_prim_to_prim_subword_vminfo(dest); 2035 break; 2036 case 2 *4+ 1: 2037 if (src == T_LONG && (dest == T_INT || is_subword_type(dest))) { 2038 ek_opt = _adapter_opt_l2i; 2039 vminfo = adapter_prim_to_prim_subword_vminfo(dest); 2040 } else if (src == T_DOUBLE && dest == T_FLOAT) { 2041 ek_opt = _adapter_opt_d2f; 2042 } else { 2043 assert(false, ""); 2044 } 2045 break; 2046 case 1 *4+ 2: 2047 if (src == T_INT && dest == T_LONG) { 2048 ek_opt = _adapter_opt_i2l; 2049 } else if (src == T_FLOAT && dest == T_DOUBLE) { 2050 ek_opt = _adapter_opt_f2d; 2051 } else { 2052 assert(false, ""); 2053 } 2054 break; 2055 default: 2056 assert(false, ""); 2057 break; 2058 } 2059 } 2060 break; 2061 2062 case _adapter_ref_to_prim: 2063 { 2064 switch (type2size[dest]) { 2065 case 1: 2066 ek_opt = _adapter_opt_unboxi; 2067 vminfo = adapter_unbox_subword_vminfo(dest); 2068 break; 2069 case 2: 2070 ek_opt = _adapter_opt_unboxl; 2071 break; 2072 default: 2073 assert(false, ""); 2074 break; 2075 } 2076 } 2077 break; 2078 2079 case _adapter_prim_to_ref: 2080 goto throw_not_impl; // allocates, hence could block 2081 2082 case _adapter_swap_args: 2083 case _adapter_rot_args: 2084 { 2085 int swap_slots = type2size[src]; 2086 int slot_limit = sun_dyn_AdapterMethodHandle::vmslots(mh()); 2087 int src_slot = argslot; 2088 int dest_slot = vminfo; 2089 int rotate = (ek_orig == _adapter_swap_args) ? 0 : (src_slot > dest_slot) ? 1 : -1; 2090 switch (swap_slots) { 2091 case 1: 2092 ek_opt = (!rotate ? _adapter_opt_swap_1 : 2093 rotate > 0 ? _adapter_opt_rot_1_up : _adapter_opt_rot_1_down); 2094 break; 2095 case 2: 2096 ek_opt = (!rotate ? _adapter_opt_swap_2 : 2097 rotate > 0 ? _adapter_opt_rot_2_up : _adapter_opt_rot_2_down); 2098 break; 2099 default: 2100 assert(false, ""); 2101 break; 2102 } 2103 } 2104 break; 2105 2106 case _adapter_collect_args: 2107 goto throw_not_impl; // allocates, hence could block 2108 2109 case _adapter_spread_args: 2110 { 2111 // vminfo will be the required length of the array 2112 int slots_pushed = stack_move / stack_move_unit(); 2113 int array_size = slots_pushed + 1; 2114 assert(array_size >= 0, ""); 2115 vminfo = array_size; 2116 switch (array_size) { 2117 case 0: ek_opt = _adapter_opt_spread_0; break; 2118 case 1: ek_opt = _adapter_opt_spread_1; break; 2119 default: ek_opt = _adapter_opt_spread_more; break; 2120 } 2121 if ((vminfo & CONV_VMINFO_MASK) != vminfo) 2122 goto throw_not_impl; // overflow 2123 } 2124 break; 2125 2126 case _adapter_flyby: 2127 case _adapter_ricochet: 2128 goto throw_not_impl; // runs Java code, hence could block 2129 2130 default: 2131 // should have failed much earlier; must be a missing case here 2132 assert(false, "incomplete switch"); 2133 // and fall through: 2134 2135 throw_not_impl: 2136 // FIXME: these adapters are NYI 2137 err = "adapter not yet implemented in the JVM"; 2138 break; 2139 } 2140 2141 if (err != NULL) { 2142 throw_InternalError_for_bad_conversion(conversion, err, THREAD); 2143 return; 2144 } 2145 2146 // Rebuild the conversion value; maybe parts of it were changed. 2147 jint new_conversion = adapter_conversion(conv_op, src, dest, stack_move, vminfo); 2148 2149 // Finalize the conversion field. (Note that it is final to Java code.) 2150 sun_dyn_AdapterMethodHandle::set_conversion(mh(), new_conversion); 2151 2152 // Done! 2153 java_dyn_MethodHandle::set_vmentry(mh(), entry(ek_opt)); 2154 2155 // There should be enough memory barriers on exit from native methods 2156 // to ensure that the MH is fully initialized to all threads before 2157 // Java code can publish it in global data structures. 2158 } 2159 2160 // 2161 // Here are the native methods on sun.dyn.MethodHandleImpl. 2162 // They are the private interface between this JVM and the HotSpot-specific 2163 // Java code that implements JSR 292 method handles. 2164 // 2165 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way 2166 // that intrinsic (non-JNI) native methods are defined in HotSpot. 2167 // 2168 2169 // direct method handles for invokestatic or invokespecial 2170 // void init(DirectMethodHandle self, MemberName ref, boolean doDispatch, Class<?> caller); 2171 JVM_ENTRY(void, MHI_init_DMH(JNIEnv *env, jobject igcls, jobject mh_jh, 2172 jobject target_jh, jboolean do_dispatch, jobject caller_jh)) { 2173 ResourceMark rm; // for error messages 2174 2175 // This is the guy we are initializing: 2176 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } 2177 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); 2178 2179 // Early returns out of this method leave the DMH in an unfinished state. 2180 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); 2181 2182 // which method are we really talking about? 2183 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } 2184 oop target_oop = JNIHandles::resolve_non_null(target_jh); 2185 if (sun_dyn_MemberName::is_instance(target_oop) && 2186 sun_dyn_MemberName::vmindex(target_oop) == VM_INDEX_UNINITIALIZED) { 2187 Handle mname(THREAD, target_oop); 2188 MethodHandles::resolve_MemberName(mname, CHECK); 2189 target_oop = mname(); // in case of GC 2190 } 2191 2192 int decode_flags = 0; klassOop receiver_limit = NULL; 2193 methodHandle m(THREAD, 2194 MethodHandles::decode_method(target_oop, 2195 receiver_limit, decode_flags)); 2196 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "no such method"); } 2197 2198 // The trusted Java code that calls this method should already have performed 2199 // access checks on behalf of the given caller. But, we can verify this. 2200 if (VerifyMethodHandles && caller_jh != NULL) { 2201 KlassHandle caller(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh))); 2202 // If this were a bytecode, the first access check would be against 2203 // the "reference class" mentioned in the CONSTANT_Methodref. 2204 // We don't know at this point which class that was, and if we 2205 // check against m.method_holder we might get the wrong answer. 2206 // So we just make sure to handle this check when the resolution 2207 // happens, when we call resolve_MemberName. 2208 // 2209 // (A public class can inherit public members from private supers, 2210 // and it would be wrong to check access against the private super 2211 // if the original symbolic reference was against the public class.) 2212 // 2213 // If there were a bytecode, the next step would be to lookup the method 2214 // in the reference class, then then check the method's access bits. 2215 // Emulate LinkResolver::check_method_accessability. 2216 klassOop resolved_klass = m->method_holder(); 2217 if (!Reflection::verify_field_access(caller->as_klassOop(), 2218 resolved_klass, resolved_klass, 2219 m->access_flags(), 2220 true)) { 2221 // %%% following cutout belongs in Reflection::verify_field_access? 2222 bool same_pm = Reflection::is_same_package_member(caller->as_klassOop(), 2223 resolved_klass, THREAD); 2224 if (!same_pm) { 2225 THROW_MSG(vmSymbols::java_lang_InternalError(), m->name_and_sig_as_C_string()); 2226 } 2227 } 2228 } 2229 2230 MethodHandles::init_DirectMethodHandle(mh, m, (do_dispatch != JNI_FALSE), CHECK); 2231 } 2232 JVM_END 2233 2234 // bound method handles 2235 JVM_ENTRY(void, MHI_init_BMH(JNIEnv *env, jobject igcls, jobject mh_jh, 2236 jobject target_jh, int argnum)) { 2237 ResourceMark rm; // for error messages 2238 2239 // This is the guy we are initializing: 2240 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } 2241 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); 2242 2243 // Early returns out of this method leave the BMH in an unfinished state. 2244 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); 2245 2246 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } 2247 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); 2248 2249 if (!java_dyn_MethodHandle::is_instance(target())) { 2250 // Target object is a reflective method. (%%% Do we need this alternate path?) 2251 Untested("init_BMH of non-MH"); 2252 if (argnum != 0) { THROW(vmSymbols::java_lang_InternalError()); } 2253 int decode_flags = 0; klassOop receiver_limit_oop = NULL; 2254 methodHandle m(THREAD, 2255 MethodHandles::decode_method(target(), 2256 receiver_limit_oop, 2257 decode_flags)); 2258 KlassHandle receiver_limit(THREAD, receiver_limit_oop); 2259 MethodHandles::init_BoundMethodHandle_with_receiver(mh, m, 2260 receiver_limit, 2261 decode_flags, 2262 CHECK); 2263 return; 2264 } 2265 2266 // Build a BMH on top of a DMH or another BMH: 2267 MethodHandles::init_BoundMethodHandle(mh, target, argnum, CHECK); 2268 } 2269 JVM_END 2270 2271 // adapter method handles 2272 JVM_ENTRY(void, MHI_init_AMH(JNIEnv *env, jobject igcls, jobject mh_jh, 2273 jobject target_jh, int argnum)) { 2274 // This is the guy we are initializing: 2275 if (mh_jh == NULL || target_jh == NULL) { 2276 THROW(vmSymbols::java_lang_InternalError()); 2277 } 2278 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); 2279 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); 2280 2281 // Early returns out of this method leave the AMH in an unfinished state. 2282 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); 2283 2284 MethodHandles::init_AdapterMethodHandle(mh, target, argnum, CHECK); 2285 } 2286 JVM_END 2287 2288 // method type forms 2289 JVM_ENTRY(void, MHI_init_MT(JNIEnv *env, jobject igcls, jobject erased_jh)) { 2290 if (erased_jh == NULL) return; 2291 if (TraceMethodHandles) { 2292 tty->print("creating MethodType form "); 2293 if (WizardMode || Verbose) { // Warning: this calls Java code on the MH! 2294 // call Object.toString() 2295 Symbol* name = vmSymbols::toString_name(); 2296 Symbol* sig = vmSymbols::void_string_signature(); 2297 JavaCallArguments args(Handle(THREAD, JNIHandles::resolve_non_null(erased_jh))); 2298 JavaValue result(T_OBJECT); 2299 JavaCalls::call_virtual(&result, SystemDictionary::Object_klass(), name, sig, 2300 &args, CHECK); 2301 Handle str(THREAD, (oop)result.get_jobject()); 2302 java_lang_String::print(str, tty); 2303 } 2304 tty->cr(); 2305 } 2306 } 2307 JVM_END 2308 2309 // debugging and reflection 2310 JVM_ENTRY(jobject, MHI_getTarget(JNIEnv *env, jobject igcls, jobject mh_jh, jint format)) { 2311 Handle mh(THREAD, JNIHandles::resolve(mh_jh)); 2312 if (!java_dyn_MethodHandle::is_instance(mh())) { 2313 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); 2314 } 2315 oop target = MethodHandles::encode_target(mh, format, CHECK_NULL); 2316 return JNIHandles::make_local(THREAD, target); 2317 } 2318 JVM_END 2319 2320 JVM_ENTRY(jint, MHI_getConstant(JNIEnv *env, jobject igcls, jint which)) { 2321 switch (which) { 2322 case MethodHandles::GC_JVM_PUSH_LIMIT: 2323 guarantee(MethodHandlePushLimit >= 2 && MethodHandlePushLimit <= 0xFF, 2324 "MethodHandlePushLimit parameter must be in valid range"); 2325 return MethodHandlePushLimit; 2326 case MethodHandles::GC_JVM_STACK_MOVE_UNIT: 2327 // return number of words per slot, signed according to stack direction 2328 return MethodHandles::stack_move_unit(); 2329 case MethodHandles::GC_CONV_OP_IMPLEMENTED_MASK: 2330 return MethodHandles::adapter_conversion_ops_supported_mask(); 2331 } 2332 return 0; 2333 } 2334 JVM_END 2335 2336 #ifndef PRODUCT 2337 #define EACH_NAMED_CON(template) \ 2338 template(MethodHandles,GC_JVM_PUSH_LIMIT) \ 2339 template(MethodHandles,GC_JVM_STACK_MOVE_UNIT) \ 2340 template(MethodHandles,ETF_HANDLE_OR_METHOD_NAME) \ 2341 template(MethodHandles,ETF_DIRECT_HANDLE) \ 2342 template(MethodHandles,ETF_METHOD_NAME) \ 2343 template(MethodHandles,ETF_REFLECT_METHOD) \ 2344 template(sun_dyn_MemberName,MN_IS_METHOD) \ 2345 template(sun_dyn_MemberName,MN_IS_CONSTRUCTOR) \ 2346 template(sun_dyn_MemberName,MN_IS_FIELD) \ 2347 template(sun_dyn_MemberName,MN_IS_TYPE) \ 2348 template(sun_dyn_MemberName,MN_SEARCH_SUPERCLASSES) \ 2349 template(sun_dyn_MemberName,MN_SEARCH_INTERFACES) \ 2350 template(sun_dyn_MemberName,VM_INDEX_UNINITIALIZED) \ 2351 template(sun_dyn_AdapterMethodHandle,OP_RETYPE_ONLY) \ 2352 template(sun_dyn_AdapterMethodHandle,OP_RETYPE_RAW) \ 2353 template(sun_dyn_AdapterMethodHandle,OP_CHECK_CAST) \ 2354 template(sun_dyn_AdapterMethodHandle,OP_PRIM_TO_PRIM) \ 2355 template(sun_dyn_AdapterMethodHandle,OP_REF_TO_PRIM) \ 2356 template(sun_dyn_AdapterMethodHandle,OP_PRIM_TO_REF) \ 2357 template(sun_dyn_AdapterMethodHandle,OP_SWAP_ARGS) \ 2358 template(sun_dyn_AdapterMethodHandle,OP_ROT_ARGS) \ 2359 template(sun_dyn_AdapterMethodHandle,OP_DUP_ARGS) \ 2360 template(sun_dyn_AdapterMethodHandle,OP_DROP_ARGS) \ 2361 template(sun_dyn_AdapterMethodHandle,OP_COLLECT_ARGS) \ 2362 template(sun_dyn_AdapterMethodHandle,OP_SPREAD_ARGS) \ 2363 template(sun_dyn_AdapterMethodHandle,OP_FLYBY) \ 2364 template(sun_dyn_AdapterMethodHandle,OP_RICOCHET) \ 2365 template(sun_dyn_AdapterMethodHandle,CONV_OP_LIMIT) \ 2366 template(sun_dyn_AdapterMethodHandle,CONV_OP_MASK) \ 2367 template(sun_dyn_AdapterMethodHandle,CONV_VMINFO_MASK) \ 2368 template(sun_dyn_AdapterMethodHandle,CONV_VMINFO_SHIFT) \ 2369 template(sun_dyn_AdapterMethodHandle,CONV_OP_SHIFT) \ 2370 template(sun_dyn_AdapterMethodHandle,CONV_DEST_TYPE_SHIFT) \ 2371 template(sun_dyn_AdapterMethodHandle,CONV_SRC_TYPE_SHIFT) \ 2372 template(sun_dyn_AdapterMethodHandle,CONV_STACK_MOVE_SHIFT) \ 2373 template(sun_dyn_AdapterMethodHandle,CONV_STACK_MOVE_MASK) \ 2374 /*end*/ 2375 2376 #define ONE_PLUS(scope,value) 1+ 2377 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS) 0; 2378 #define VALUE_COMMA(scope,value) scope::value, 2379 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA) 0 }; 2380 #define STRING_NULL(scope,value) #value "\0" 2381 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL) }; 2382 2383 #undef ONE_PLUS 2384 #undef VALUE_COMMA 2385 #undef STRING_NULL 2386 #undef EACH_NAMED_CON 2387 #endif 2388 2389 JVM_ENTRY(jint, MHI_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { 2390 #ifndef PRODUCT 2391 if (which >= 0 && which < con_value_count) { 2392 int con = con_values[which]; 2393 objArrayOop box = (objArrayOop) JNIHandles::resolve(box_jh); 2394 if (box != NULL && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { 2395 const char* str = &con_names[0]; 2396 for (int i = 0; i < which; i++) 2397 str += strlen(str) + 1; // skip name and null 2398 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); 2399 box->obj_at_put(0, name); 2400 } 2401 return con; 2402 } 2403 #endif 2404 return 0; 2405 } 2406 JVM_END 2407 2408 // void init(MemberName self, AccessibleObject ref) 2409 JVM_ENTRY(void, MHI_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { 2410 if (mname_jh == NULL || target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } 2411 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 2412 oop target_oop = JNIHandles::resolve_non_null(target_jh); 2413 MethodHandles::init_MemberName(mname(), target_oop); 2414 } 2415 JVM_END 2416 2417 // void expand(MemberName self) 2418 JVM_ENTRY(void, MHI_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { 2419 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } 2420 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 2421 MethodHandles::expand_MemberName(mname, 0, CHECK); 2422 } 2423 JVM_END 2424 2425 // void resolve(MemberName self, Class<?> caller) 2426 JVM_ENTRY(void, MHI_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { 2427 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } 2428 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 2429 2430 // The trusted Java code that calls this method should already have performed 2431 // access checks on behalf of the given caller. But, we can verify this. 2432 if (VerifyMethodHandles && caller_jh != NULL) { 2433 klassOop reference_klass = java_lang_Class::as_klassOop(sun_dyn_MemberName::clazz(mname())); 2434 if (reference_klass != NULL) { 2435 // Emulate LinkResolver::check_klass_accessability. 2436 klassOop caller = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh)); 2437 if (!Reflection::verify_class_access(caller, 2438 reference_klass, 2439 true)) { 2440 THROW_MSG(vmSymbols::java_lang_InternalError(), Klass::cast(reference_klass)->external_name()); 2441 } 2442 } 2443 } 2444 2445 MethodHandles::resolve_MemberName(mname, CHECK); 2446 } 2447 JVM_END 2448 2449 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 2450 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 2451 JVM_ENTRY(jint, MHI_getMembers(JNIEnv *env, jobject igcls, 2452 jclass clazz_jh, jstring name_jh, jstring sig_jh, 2453 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { 2454 if (clazz_jh == NULL || results_jh == NULL) return -1; 2455 klassOop k_oop = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz_jh)); 2456 2457 objArrayOop results = (objArrayOop) JNIHandles::resolve(results_jh); 2458 if (results == NULL || !results->is_objArray()) return -1; 2459 2460 TempNewSymbol name = NULL; 2461 TempNewSymbol sig = NULL; 2462 if (name_jh != NULL) { 2463 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); 2464 if (name == NULL) return 0; // a match is not possible 2465 } 2466 if (sig_jh != NULL) { 2467 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); 2468 if (sig == NULL) return 0; // a match is not possible 2469 } 2470 2471 klassOop caller = NULL; 2472 if (caller_jh != NULL) { 2473 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); 2474 if (!java_lang_Class::is_instance(caller_oop)) return -1; 2475 caller = java_lang_Class::as_klassOop(caller_oop); 2476 } 2477 2478 if (name != NULL && sig != NULL && results != NULL) { 2479 // try a direct resolve 2480 // %%% TO DO 2481 } 2482 2483 int res = MethodHandles::find_MemberNames(k_oop, name, sig, mflags, 2484 caller, skip, results); 2485 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks 2486 return res; 2487 } 2488 JVM_END 2489 2490 JVM_ENTRY(void, MHI_registerBootstrap(JNIEnv *env, jobject igcls, jclass caller_jh, jobject bsm_jh)) { 2491 instanceKlassHandle ik = MethodHandles::resolve_instance_klass(caller_jh, THREAD); 2492 if (!AllowTransitionalJSR292) { 2493 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 2494 "registerBootstrapMethod is only supported in JSR 292 EDR"); 2495 } 2496 ik->link_class(CHECK); 2497 if (!java_dyn_MethodHandle::is_instance(JNIHandles::resolve(bsm_jh))) { 2498 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "method handle"); 2499 } 2500 const char* err = NULL; 2501 if (ik->is_initialized() || ik->is_in_error_state()) { 2502 err = "too late: class is already initialized"; 2503 } else { 2504 ObjectLocker ol(ik, THREAD); // note: this should be a recursive lock 2505 if (ik->is_not_initialized() || 2506 (ik->is_being_initialized() && ik->is_reentrant_initialization(THREAD))) { 2507 if (ik->bootstrap_method() != NULL) { 2508 err = "class is already equipped with a bootstrap method"; 2509 } else { 2510 ik->set_bootstrap_method(JNIHandles::resolve_non_null(bsm_jh)); 2511 err = NULL; 2512 } 2513 } else { 2514 err = "class is already initialized"; 2515 if (ik->is_being_initialized()) 2516 err = "class is already being initialized in a different thread"; 2517 } 2518 } 2519 if (err != NULL) { 2520 THROW_MSG(vmSymbols::java_lang_IllegalStateException(), err); 2521 } 2522 } 2523 JVM_END 2524 2525 JVM_ENTRY(jobject, MHI_getBootstrap(JNIEnv *env, jobject igcls, jclass caller_jh)) { 2526 instanceKlassHandle ik = MethodHandles::resolve_instance_klass(caller_jh, THREAD); 2527 return JNIHandles::make_local(THREAD, ik->bootstrap_method()); 2528 } 2529 JVM_END 2530 2531 JVM_ENTRY(void, MHI_setCallSiteTarget(JNIEnv *env, jobject igcls, jobject site_jh, jobject target_jh)) { 2532 // No special action required, yet. 2533 oop site_oop = JNIHandles::resolve(site_jh); 2534 if (!java_dyn_CallSite::is_instance(site_oop)) 2535 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "not a CallSite"); 2536 java_dyn_CallSite::set_target(site_oop, JNIHandles::resolve(target_jh)); 2537 } 2538 JVM_END 2539 2540 2541 /// JVM_RegisterMethodHandleMethods 2542 2543 #define ADR "J" 2544 2545 #define LANG "Ljava/lang/" 2546 #define JDYN "Ljava/dyn/" 2547 #define IDYN "Lsun/dyn/" 2548 2549 #define OBJ LANG"Object;" 2550 #define CLS LANG"Class;" 2551 #define STRG LANG"String;" 2552 #define CST JDYN"CallSite;" 2553 #define MT JDYN"MethodType;" 2554 #define MH JDYN"MethodHandle;" 2555 #define MHI IDYN"MethodHandleImpl;" 2556 #define MEM IDYN"MemberName;" 2557 #define AMH IDYN"AdapterMethodHandle;" 2558 #define BMH IDYN"BoundMethodHandle;" 2559 #define DMH IDYN"DirectMethodHandle;" 2560 2561 #define CC (char*) /*cast a literal from (const char*)*/ 2562 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 2563 2564 // These are the native methods on sun.dyn.MethodHandleNatives. 2565 static JNINativeMethod methods[] = { 2566 // void init(MemberName self, AccessibleObject ref) 2567 {CC"init", CC"("AMH""MH"I)V", FN_PTR(MHI_init_AMH)}, 2568 {CC"init", CC"("BMH""OBJ"I)V", FN_PTR(MHI_init_BMH)}, 2569 {CC"init", CC"("DMH""OBJ"Z"CLS")V", FN_PTR(MHI_init_DMH)}, 2570 {CC"init", CC"("MT")V", FN_PTR(MHI_init_MT)}, 2571 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHI_init_Mem)}, 2572 {CC"expand", CC"("MEM")V", FN_PTR(MHI_expand_Mem)}, 2573 {CC"resolve", CC"("MEM""CLS")V", FN_PTR(MHI_resolve_Mem)}, 2574 {CC"getTarget", CC"("MH"I)"OBJ, FN_PTR(MHI_getTarget)}, 2575 {CC"getConstant", CC"(I)I", FN_PTR(MHI_getConstant)}, 2576 // static native int getNamedCon(int which, Object[] name) 2577 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHI_getNamedCon)}, 2578 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 2579 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 2580 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHI_getMembers)} 2581 }; 2582 2583 // More entry points specifically for EnableInvokeDynamic. 2584 static JNINativeMethod methods2[] = { 2585 {CC"registerBootstrap", CC"("CLS MH")V", FN_PTR(MHI_registerBootstrap)}, 2586 {CC"getBootstrap", CC"("CLS")"MH, FN_PTR(MHI_getBootstrap)}, 2587 {CC"setCallSiteTarget", CC"("CST MH")V", FN_PTR(MHI_setCallSiteTarget)} 2588 }; 2589 2590 2591 // This one function is exported, used by NativeLookup. 2592 2593 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { 2594 assert(MethodHandles::spot_check_entry_names(), "entry enum is OK"); 2595 2596 // note: this explicit warning-producing stuff will be replaced by auto-detection of the JSR 292 classes 2597 2598 if (!EnableMethodHandles) { 2599 warning("JSR 292 method handles are disabled in this JVM. Use -XX:+UnlockExperimentalVMOptions -XX:+EnableMethodHandles to enable."); 2600 return; // bind nothing 2601 } 2602 2603 bool enable_MH = true; 2604 2605 { 2606 ThreadToNativeFromVM ttnfv(thread); 2607 2608 int status = env->RegisterNatives(MHN_class, methods, sizeof(methods)/sizeof(JNINativeMethod)); 2609 if (env->ExceptionOccurred()) { 2610 MethodHandles::set_enabled(false); 2611 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); 2612 enable_MH = false; 2613 env->ExceptionClear(); 2614 } 2615 } 2616 2617 if (enable_MH) { 2618 KlassHandle MHI_klass = SystemDictionaryHandles::MethodHandleImpl_klass(); 2619 if (MHI_klass.not_null()) { 2620 TempNewSymbol raiseException_name = SymbolTable::new_symbol("raiseException", CHECK); 2621 TempNewSymbol raiseException_sig = SymbolTable::new_symbol("(ILjava/lang/Object;Ljava/lang/Object;)V", CHECK); 2622 methodOop raiseException_method = instanceKlass::cast(MHI_klass->as_klassOop()) 2623 ->find_method(raiseException_name, raiseException_sig); 2624 if (raiseException_method != NULL && raiseException_method->is_static()) { 2625 MethodHandles::set_raise_exception_method(raiseException_method); 2626 } else { 2627 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); 2628 enable_MH = false; 2629 } 2630 } else { 2631 enable_MH = false; 2632 } 2633 } 2634 2635 if (enable_MH) { 2636 // We need to link the MethodHandleImpl klass before we generate 2637 // the method handle adapters as the _raise_exception adapter uses 2638 // one of its methods (and its c2i-adapter). 2639 KlassHandle k = SystemDictionaryHandles::MethodHandleImpl_klass(); 2640 instanceKlass* ik = instanceKlass::cast(k()); 2641 ik->link_class(CHECK); 2642 2643 MethodHandles::generate_adapters(); 2644 MethodHandles::set_enabled(true); 2645 } 2646 2647 if (!EnableInvokeDynamic) { 2648 warning("JSR 292 invokedynamic is disabled in this JVM. Use -XX:+UnlockExperimentalVMOptions -XX:+EnableInvokeDynamic to enable."); 2649 return; // bind nothing 2650 } 2651 2652 { 2653 ThreadToNativeFromVM ttnfv(thread); 2654 2655 int status = env->RegisterNatives(MHN_class, methods2, sizeof(methods2)/sizeof(JNINativeMethod)); 2656 if (env->ExceptionOccurred()) { 2657 MethodHandles::set_enabled(false); 2658 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); 2659 env->ExceptionClear(); 2660 } else { 2661 MethodHandles::set_enabled(true); 2662 } 2663 } 2664 } 2665 JVM_END