1 /* 2 * Copyright (c) 2008, 2012, 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 "compiler/compileBroker.hpp" 28 #include "interpreter/interpreter.hpp" 29 #include "interpreter/oopMapCache.hpp" 30 #include "memory/allocation.inline.hpp" 31 #include "memory/oopFactory.hpp" 32 #include "prims/methodHandles.hpp" 33 #include "runtime/compilationPolicy.hpp" 34 #include "runtime/javaCalls.hpp" 35 #include "runtime/reflection.hpp" 36 #include "runtime/signature.hpp" 37 #include "runtime/stubRoutines.hpp" 38 39 40 /* 41 * JSR 292 reference implementation: method handles 42 * The JDK 7 reference implementation represented method handle 43 * combinations as chains. Each link in the chain had a "vmentry" 44 * field which pointed at a bit of assembly code which performed 45 * one transformation before dispatching to the next link in the chain. 46 * 47 * The current reference implementation pushes almost all code generation 48 * responsibility to (trusted) Java code. A method handle contains a 49 * pointer to its "LambdaForm", which embodies all details of the method 50 * handle's behavior. The LambdaForm is a normal Java object, managed 51 * by a runtime coded in Java. 52 */ 53 54 bool MethodHandles::_enabled = false; // set true after successful native linkage 55 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL; 56 57 //------------------------------------------------------------------------------ 58 // MethodHandles::generate_adapters 59 // 60 void MethodHandles::generate_adapters() { 61 if (!EnableInvokeDynamic || SystemDictionary::MethodHandle_klass() == NULL) return; 62 63 assert(_adapter_code == NULL, "generate only once"); 64 65 ResourceMark rm; 66 TraceTime timer("MethodHandles adapters generation", TraceStartupTime); 67 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size); 68 if (_adapter_code == NULL) 69 vm_exit_out_of_memory(adapter_code_size, "CodeCache: no room for MethodHandles adapters"); 70 { 71 CodeBuffer code(_adapter_code); 72 MethodHandlesAdapterGenerator g(&code); 73 g.generate(); 74 code.log_section_sizes("MethodHandlesAdapterBlob"); 75 } 76 } 77 78 //------------------------------------------------------------------------------ 79 // MethodHandlesAdapterGenerator::generate 80 // 81 void MethodHandlesAdapterGenerator::generate() { 82 // Generate generic method handle adapters. 83 // Generate interpreter entries 84 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST; 85 mk <= Interpreter::method_handle_invoke_LAST; 86 mk = Interpreter::MethodKind(1 + (int)mk)) { 87 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk); 88 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid)); 89 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid); 90 if (entry != NULL) { 91 Interpreter::set_entry_for_kind(mk, entry); 92 } 93 // If the entry is not set, it will throw AbstractMethodError. 94 } 95 } 96 97 void MethodHandles::set_enabled(bool z) { 98 if (_enabled != z) { 99 guarantee(z && EnableInvokeDynamic, "can only enable once, and only if -XX:+EnableInvokeDynamic"); 100 _enabled = z; 101 } 102 } 103 104 // MemberName support 105 106 // import java_lang_invoke_MemberName.* 107 enum { 108 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD, 109 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR, 110 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD, 111 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE, 112 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE, 113 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, 114 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, 115 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES, 116 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES, 117 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE 118 }; 119 120 Handle MethodHandles::new_MemberName(TRAPS) { 121 Handle empty; 122 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass()); 123 if (!k->is_initialized()) k->initialize(CHECK_(empty)); 124 return Handle(THREAD, k->allocate_instance(THREAD)); 125 } 126 127 oop MethodHandles::init_MemberName(oop mname_oop, oop target_oop) { 128 Klass* target_klass = target_oop->klass(); 129 if (target_klass == SystemDictionary::reflect_Field_klass()) { 130 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() 131 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() 132 int mods = java_lang_reflect_Field::modifiers(target_oop); 133 oop type = java_lang_reflect_Field::type(target_oop); 134 oop name = java_lang_reflect_Field::name(target_oop); 135 Klass* k = java_lang_Class::as_Klass(clazz); 136 intptr_t offset = InstanceKlass::cast(k)->field_offset(slot); 137 return init_field_MemberName(mname_oop, k, accessFlags_from(mods), type, name, offset); 138 } else if (target_klass == SystemDictionary::reflect_Method_klass()) { 139 oop clazz = java_lang_reflect_Method::clazz(target_oop); 140 int slot = java_lang_reflect_Method::slot(target_oop); 141 Klass* k = java_lang_Class::as_Klass(clazz); 142 if (k != NULL && k->oop_is_instance()) { 143 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 144 return init_method_MemberName(mname_oop, m, true, k); 145 } 146 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) { 147 oop clazz = java_lang_reflect_Constructor::clazz(target_oop); 148 int slot = java_lang_reflect_Constructor::slot(target_oop); 149 Klass* k = java_lang_Class::as_Klass(clazz); 150 if (k != NULL && k->oop_is_instance()) { 151 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 152 return init_method_MemberName(mname_oop, m, false, k); 153 } 154 } else if (target_klass == SystemDictionary::MemberName_klass()) { 155 // Note: This only works if the MemberName has already been resolved. 156 oop clazz = java_lang_invoke_MemberName::clazz(target_oop); 157 int flags = java_lang_invoke_MemberName::flags(target_oop); 158 Metadata* vmtarget=java_lang_invoke_MemberName::vmtarget(target_oop); 159 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(target_oop); 160 Klass* k = java_lang_Class::as_Klass(clazz); 161 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 162 if (vmtarget == NULL) return NULL; // not resolved 163 if ((flags & IS_FIELD) != 0) { 164 assert(vmtarget->is_klass(), "field vmtarget is Klass*"); 165 int basic_mods = (ref_kind_is_static(ref_kind) ? JVM_ACC_STATIC : 0); 166 // FIXME: how does k (receiver_limit) contribute? 167 return init_field_MemberName(mname_oop, (Klass*)vmtarget, accessFlags_from(basic_mods), NULL, NULL, vmindex); 168 } else if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { 169 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*"); 170 return init_method_MemberName(mname_oop, (Method*)vmtarget, ref_kind_does_dispatch(ref_kind), k); 171 } else { 172 return NULL; 173 } 174 } 175 return NULL; 176 } 177 178 oop MethodHandles::init_method_MemberName(oop mname_oop, Method* m, bool do_dispatch, 179 Klass* receiver_limit) { 180 AccessFlags mods = m->access_flags(); 181 int flags = (jushort)( mods.as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ); 182 int vmindex = Method::nonvirtual_vtable_index; // implies never any dispatch 183 Klass* mklass = m->method_holder(); 184 if (receiver_limit == NULL) 185 receiver_limit = mklass; 186 if (m->is_initializer()) { 187 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 188 } else if (mods.is_static()) { 189 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT); 190 } else if (receiver_limit != mklass && 191 !receiver_limit->is_subtype_of(mklass)) { 192 return NULL; // bad receiver limit 193 } else if (receiver_limit->is_interface() && 194 mklass->is_interface()) { 195 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT); 196 receiver_limit = mklass; // ignore passed-in limit; interfaces are interconvertible 197 vmindex = klassItable::compute_itable_index(m); 198 } else if (mklass != receiver_limit && mklass->is_interface()) { 199 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT); 200 // it is a miranda method, so m->vtable_index is not what we want 201 ResourceMark rm; 202 klassVtable* vt = InstanceKlass::cast(receiver_limit)->vtable(); 203 vmindex = vt->index_of_miranda(m->name(), m->signature()); 204 } else if (!do_dispatch || m->can_be_statically_bound()) { 205 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 206 } else { 207 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT); 208 vmindex = m->vtable_index(); 209 } 210 211 // @CallerSensitive annotation detected 212 if (m->caller_sensitive()) { 213 flags |= CALLER_SENSITIVE; 214 } 215 216 java_lang_invoke_MemberName::set_flags( mname_oop, flags); 217 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m); 218 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index 219 java_lang_invoke_MemberName::set_clazz( mname_oop, receiver_limit->java_mirror()); 220 // Note: name and type can be lazily computed by resolve_MemberName, 221 // if Java code needs them as resolved String and MethodType objects. 222 // The clazz must be eagerly stored, because it provides a GC 223 // root to help keep alive the Method*. 224 // If relevant, the vtable or itable value is stored as vmindex. 225 // This is done eagerly, since it is readily available without 226 // constructing any new objects. 227 // TO DO: maybe intern mname_oop 228 return mname_oop; 229 } 230 231 Handle MethodHandles::init_method_MemberName(oop mname_oop, CallInfo& info, TRAPS) { 232 Handle empty; 233 if (info.resolved_appendix().not_null()) { 234 // The resolved MemberName must not be accompanied by an appendix argument, 235 // since there is no way to bind this value into the MemberName. 236 // Caller is responsible to prevent this from happening. 237 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty); 238 } 239 methodHandle m = info.resolved_method(); 240 KlassHandle defc = info.resolved_klass(); 241 int vmindex = -1; 242 if (defc->is_interface() && m->method_holder()->is_interface()) { 243 // LinkResolver does not report itable indexes! (fix this?) 244 vmindex = klassItable::compute_itable_index(m()); 245 } else if (m->can_be_statically_bound()) { 246 // LinkResolver reports vtable index even for final methods! 247 vmindex = Method::nonvirtual_vtable_index; 248 } else { 249 vmindex = info.vtable_index(); 250 } 251 oop res = init_method_MemberName(mname_oop, m(), (vmindex >= 0), defc()); 252 assert(res == NULL || (java_lang_invoke_MemberName::vmindex(res) == vmindex), ""); 253 return Handle(THREAD, res); 254 } 255 256 oop MethodHandles::init_field_MemberName(oop mname_oop, Klass* field_holder, 257 AccessFlags mods, oop type, oop name, 258 intptr_t offset, bool is_setter) { 259 int flags = (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ); 260 flags |= IS_FIELD | ((mods.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT); 261 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT); 262 Metadata* vmtarget = field_holder; 263 int vmindex = offset; // determines the field uniquely when combined with static bit 264 java_lang_invoke_MemberName::set_flags(mname_oop, flags); 265 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget); 266 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); 267 java_lang_invoke_MemberName::set_clazz(mname_oop, field_holder->java_mirror()); 268 if (name != NULL) 269 java_lang_invoke_MemberName::set_name(mname_oop, name); 270 if (type != NULL) 271 java_lang_invoke_MemberName::set_type(mname_oop, type); 272 // Note: name and type can be lazily computed by resolve_MemberName, 273 // if Java code needs them as resolved String and Class objects. 274 // Note that the incoming type oop might be pre-resolved (non-null). 275 // The base clazz and field offset (vmindex) must be eagerly stored, 276 // because they unambiguously identify the field. 277 // Although the fieldDescriptor::_index would also identify the field, 278 // we do not use it, because it is harder to decode. 279 // TO DO: maybe intern mname_oop 280 return mname_oop; 281 } 282 283 Handle MethodHandles::init_field_MemberName(oop mname_oop, FieldAccessInfo& info, TRAPS) { 284 return Handle(); 285 #if 0 // FIXME 286 KlassHandle field_holder = info.klass(); 287 intptr_t field_offset = info.field_offset(); 288 return init_field_MemberName(mname_oop, field_holder(), 289 info.access_flags(), 290 type, name, 291 field_offset, false /*is_setter*/); 292 #endif 293 } 294 295 296 // JVM 2.9 Special Methods: 297 // A method is signature polymorphic if and only if all of the following conditions hold : 298 // * It is declared in the java.lang.invoke.MethodHandle class. 299 // * It has a single formal parameter of type Object[]. 300 // * It has a return type of Object. 301 // * It has the ACC_VARARGS and ACC_NATIVE flags set. 302 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) { 303 if (klass == NULL) 304 return false; 305 // The following test will fail spuriously during bootstrap of MethodHandle itself: 306 // if (klass != SystemDictionary::MethodHandle_klass()) 307 // Test the name instead: 308 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle()) 309 return false; 310 Symbol* poly_sig = vmSymbols::object_array_object_signature(); 311 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig); 312 if (m == NULL) return false; 313 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 314 int flags = m->access_flags().as_int(); 315 return (flags & required) == required; 316 } 317 318 319 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) { 320 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid)); 321 switch (iid) { 322 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name(); 323 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name(); 324 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name(); 325 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name(); 326 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name(); 327 } 328 assert(false, ""); 329 return 0; 330 } 331 332 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) { 333 switch (iid) { 334 case vmIntrinsics::_invokeBasic: return 0; 335 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual; 336 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic; 337 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial; 338 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface; 339 } 340 assert(false, err_msg("iid=%d", iid)); 341 return 0; 342 } 343 344 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) { 345 vmSymbols::SID name_id = vmSymbols::find_sid(name); 346 switch (name_id) { 347 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins. 348 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric; 349 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic: 350 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic; 351 352 // There is one static signature-polymorphic method for each JVM invocation mode. 353 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual; 354 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic; 355 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial; 356 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface; 357 } 358 359 // Cover the case of invokeExact and any future variants of invokeFoo. 360 Klass* mh_klass = SystemDictionary::well_known_klass( 361 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) ); 362 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) 363 return vmIntrinsics::_invokeGeneric; 364 365 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against. 366 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic. 367 return vmIntrinsics::_none; 368 } 369 370 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) { 371 if (klass != NULL && 372 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) { 373 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 374 if (iid != vmIntrinsics::_none) 375 return iid; 376 if (is_method_handle_invoke_name(klass, name)) 377 return vmIntrinsics::_invokeGeneric; 378 } 379 return vmIntrinsics::_none; 380 } 381 382 383 // convert the external string or reflective type to an internal signature 384 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) { 385 if (java_lang_invoke_MethodType::is_instance(type_str)) { 386 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, CHECK_NULL); 387 } else if (java_lang_Class::is_instance(type_str)) { 388 return java_lang_Class::as_signature(type_str, false, CHECK_NULL); 389 } else if (java_lang_String::is_instance(type_str)) { 390 if (intern_if_not_found) { 391 return java_lang_String::as_symbol(type_str, CHECK_NULL); 392 } else { 393 return java_lang_String::as_symbol_or_null(type_str); 394 } 395 } else { 396 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL); 397 } 398 } 399 400 static const char OBJ_SIG[] = "Ljava/lang/Object;"; 401 enum { OBJ_SIG_LEN = 18 }; 402 403 bool MethodHandles::is_basic_type_signature(Symbol* sig) { 404 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, ""); 405 assert(vmSymbols::object_signature()->equals(OBJ_SIG), ""); 406 const int len = sig->utf8_length(); 407 for (int i = 0; i < len; i++) { 408 switch (sig->byte_at(i)) { 409 case 'L': 410 // only java/lang/Object is valid here 411 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i) 412 return false; 413 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop 414 continue; 415 case '(': case ')': case 'V': 416 case 'I': case 'J': case 'F': case 'D': 417 continue; 418 //case '[': 419 //case 'Z': case 'B': case 'C': case 'S': 420 default: 421 return false; 422 } 423 } 424 return true; 425 } 426 427 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) { 428 Symbol* bsig = NULL; 429 if (sig == NULL) { 430 return sig; 431 } else if (is_basic_type_signature(sig)) { 432 sig->increment_refcount(); 433 return sig; // that was easy 434 } else if (sig->byte_at(0) != '(') { 435 BasicType bt = char2type(sig->byte_at(0)); 436 if (is_subword_type(bt)) { 437 bsig = vmSymbols::int_signature(); 438 } else { 439 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false"); 440 bsig = vmSymbols::object_signature(); 441 } 442 } else { 443 ResourceMark rm; 444 stringStream buffer(128); 445 buffer.put('('); 446 int arg_pos = 0, keep_arg_pos = -1; 447 if (keep_last_arg) 448 keep_arg_pos = ArgumentCount(sig).size() - 1; 449 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) { 450 BasicType bt = ss.type(); 451 size_t this_arg_pos = buffer.size(); 452 if (ss.at_return_type()) { 453 buffer.put(')'); 454 } 455 if (arg_pos == keep_arg_pos) { 456 buffer.write((char*) ss.raw_bytes(), 457 (int) ss.raw_length()); 458 } else if (bt == T_OBJECT || bt == T_ARRAY) { 459 buffer.write(OBJ_SIG, OBJ_SIG_LEN); 460 } else { 461 if (is_subword_type(bt)) 462 bt = T_INT; 463 buffer.put(type2char(bt)); 464 } 465 arg_pos++; 466 } 467 const char* sigstr = buffer.base(); 468 int siglen = (int) buffer.size(); 469 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD); 470 } 471 assert(is_basic_type_signature(bsig) || 472 // detune assert in case the injected argument is not a basic type: 473 keep_last_arg, ""); 474 return bsig; 475 } 476 477 void MethodHandles::print_as_basic_type_signature_on(outputStream* st, 478 Symbol* sig, 479 bool keep_arrays, 480 bool keep_basic_names) { 481 st = st ? st : tty; 482 int len = sig->utf8_length(); 483 int array = 0; 484 bool prev_type = false; 485 for (int i = 0; i < len; i++) { 486 char ch = sig->byte_at(i); 487 switch (ch) { 488 case '(': case ')': 489 prev_type = false; 490 st->put(ch); 491 continue; 492 case '[': 493 if (!keep_basic_names && keep_arrays) 494 st->put(ch); 495 array++; 496 continue; 497 case 'L': 498 { 499 if (prev_type) st->put(','); 500 int start = i+1, slash = start; 501 while (++i < len && (ch = sig->byte_at(i)) != ';') { 502 if (ch == '/' || ch == '.' || ch == '$') slash = i+1; 503 } 504 if (slash < i) start = slash; 505 if (!keep_basic_names) { 506 st->put('L'); 507 } else { 508 for (int j = start; j < i; j++) 509 st->put(sig->byte_at(j)); 510 prev_type = true; 511 } 512 break; 513 } 514 default: 515 { 516 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) { 517 ch = '['; 518 array = 0; 519 } 520 if (prev_type) st->put(','); 521 const char* n = NULL; 522 if (keep_basic_names) 523 n = type2name(char2type(ch)); 524 if (n == NULL) { 525 // unknown letter, or we don't want to know its name 526 st->put(ch); 527 } else { 528 st->print(n); 529 prev_type = true; 530 } 531 break; 532 } 533 } 534 // Switch break goes here to take care of array suffix: 535 if (prev_type) { 536 while (array > 0) { 537 st->print("[]"); 538 --array; 539 } 540 } 541 array = 0; 542 } 543 } 544 545 546 547 static oop object_java_mirror() { 548 return SystemDictionary::Object_klass()->java_mirror(); 549 } 550 551 static oop field_name_or_null(Symbol* s) { 552 if (s == NULL) return NULL; 553 return StringTable::lookup(s); 554 } 555 556 static oop field_signature_type_or_null(Symbol* s) { 557 if (s == NULL) return NULL; 558 BasicType bt = FieldType::basic_type(s); 559 if (is_java_primitive(bt)) { 560 assert(s->utf8_length() == 1, ""); 561 return java_lang_Class::primitive_mirror(bt); 562 } 563 // Here are some more short cuts for common types. 564 // They are optional, since reference types can be resolved lazily. 565 if (bt == T_OBJECT) { 566 if (s == vmSymbols::object_signature()) { 567 return object_java_mirror(); 568 } else if (s == vmSymbols::class_signature()) { 569 return SystemDictionary::Class_klass()->java_mirror(); 570 } else if (s == vmSymbols::string_signature()) { 571 return SystemDictionary::String_klass()->java_mirror(); 572 } 573 } 574 return NULL; 575 } 576 577 578 // An unresolved member name is a mere symbolic reference. 579 // Resolving it plants a vmtarget/vmindex in it, 580 // which refers directly to JVM internals. 581 Handle MethodHandles::resolve_MemberName(Handle mname, TRAPS) { 582 Handle empty; 583 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 584 585 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) { 586 // Already resolved. 587 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname())); 588 assert(vmindex >= Method::nonvirtual_vtable_index, ""); 589 return mname; 590 } 591 592 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname())); 593 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname())); 594 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname())); 595 int flags = java_lang_invoke_MemberName::flags(mname()); 596 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 597 if (!ref_kind_is_valid(ref_kind)) { 598 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty); 599 } 600 601 DEBUG_ONLY(int old_vmindex); 602 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input"); 603 604 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) { 605 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty); 606 } 607 608 instanceKlassHandle defc; 609 { 610 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop()); 611 if (defc_klass == NULL) return empty; // a primitive; no resolution possible 612 if (!defc_klass->oop_is_instance()) { 613 if (!defc_klass->oop_is_array()) return empty; 614 defc_klass = SystemDictionary::Object_klass(); 615 } 616 defc = instanceKlassHandle(THREAD, defc_klass); 617 } 618 if (defc.is_null()) { 619 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty); 620 } 621 defc->link_class(CHECK_(empty)); // possible safepoint 622 623 // convert the external string name to an internal symbol 624 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str()); 625 if (name == NULL) return empty; // no such name 626 if (name == vmSymbols::class_initializer_name()) 627 return empty; // illegal name 628 629 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none; 630 if ((flags & ALL_KINDS) == IS_METHOD && 631 (defc() == SystemDictionary::MethodHandle_klass()) && 632 (ref_kind == JVM_REF_invokeVirtual || 633 ref_kind == JVM_REF_invokeSpecial || 634 // static invocation mode is required for _linkToVirtual, etc.: 635 ref_kind == JVM_REF_invokeStatic)) { 636 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 637 if (iid != vmIntrinsics::_none && 638 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) { 639 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic. 640 // For a static reference it could an internal linkage routine like _linkToVirtual, etc. 641 mh_invoke_id = iid; 642 } 643 } 644 645 // convert the external string or reflective type to an internal signature 646 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty)); 647 if (type == NULL) return empty; // no such signature exists in the VM 648 649 // Time to do the lookup. 650 switch (flags & ALL_KINDS) { 651 case IS_METHOD: 652 { 653 CallInfo result; 654 bool do_dispatch = true; // default, neutral setting 655 { 656 assert(!HAS_PENDING_EXCEPTION, ""); 657 if (ref_kind == JVM_REF_invokeStatic) { 658 //do_dispatch = false; // no need, since statics are never dispatched 659 LinkResolver::resolve_static_call(result, 660 defc, name, type, KlassHandle(), false, false, THREAD); 661 } else if (ref_kind == JVM_REF_invokeInterface) { 662 LinkResolver::resolve_interface_call(result, Handle(), defc, 663 defc, name, type, KlassHandle(), false, false, THREAD); 664 } else if (mh_invoke_id != vmIntrinsics::_none) { 665 assert(!is_signature_polymorphic_static(mh_invoke_id), ""); 666 LinkResolver::resolve_handle_call(result, 667 defc, name, type, KlassHandle(), THREAD); 668 } else if (ref_kind == JVM_REF_invokeSpecial) { 669 do_dispatch = false; // force non-virtual linkage 670 LinkResolver::resolve_special_call(result, 671 defc, name, type, KlassHandle(), false, THREAD); 672 } else if (ref_kind == JVM_REF_invokeVirtual) { 673 LinkResolver::resolve_virtual_call(result, Handle(), defc, 674 defc, name, type, KlassHandle(), false, false, THREAD); 675 } else { 676 assert(false, err_msg("ref_kind=%d", ref_kind)); 677 } 678 if (HAS_PENDING_EXCEPTION) { 679 return empty; 680 } 681 } 682 return init_method_MemberName(mname(), result, THREAD); 683 } 684 case IS_CONSTRUCTOR: 685 { 686 CallInfo result; 687 { 688 assert(!HAS_PENDING_EXCEPTION, ""); 689 if (name == vmSymbols::object_initializer_name()) { 690 LinkResolver::resolve_special_call(result, 691 defc, name, type, KlassHandle(), false, THREAD); 692 } else { 693 break; // will throw after end of switch 694 } 695 if (HAS_PENDING_EXCEPTION) { 696 return empty; 697 } 698 } 699 assert(result.is_statically_bound(), ""); 700 return init_method_MemberName(mname(), result, THREAD); 701 } 702 case IS_FIELD: 703 { 704 // This is taken from LinkResolver::resolve_field, sans access checks. 705 fieldDescriptor fd; // find_field initializes fd if found 706 KlassHandle sel_klass(THREAD, InstanceKlass::cast(defc())->find_field(name, type, &fd)); 707 // check if field exists; i.e., if a klass containing the field def has been selected 708 if (sel_klass.is_null()) return empty; // should not happen 709 oop type = field_signature_type_or_null(fd.signature()); 710 oop name = field_name_or_null(fd.name()); 711 bool is_setter = (ref_kind_is_valid(ref_kind) && ref_kind_is_setter(ref_kind)); 712 mname = Handle(THREAD, 713 init_field_MemberName(mname(), sel_klass(), 714 fd.access_flags(), type, name, fd.offset(), is_setter)); 715 return mname; 716 } 717 default: 718 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 719 } 720 721 return empty; 722 } 723 724 // Conversely, a member name which is only initialized from JVM internals 725 // may have null defc, name, and type fields. 726 // Resolving it plants a vmtarget/vmindex in it, 727 // which refers directly to JVM internals. 728 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { 729 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 730 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 731 int vmindex = java_lang_invoke_MemberName::vmindex(mname()); 732 if (vmtarget == NULL) { 733 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); 734 } 735 736 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL); 737 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL); 738 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL); 739 int flags = java_lang_invoke_MemberName::flags(mname()); 740 741 if (suppress != 0) { 742 if (suppress & _suppress_defc) have_defc = true; 743 if (suppress & _suppress_name) have_name = true; 744 if (suppress & _suppress_type) have_type = true; 745 } 746 747 if (have_defc && have_name && have_type) return; // nothing needed 748 749 switch (flags & ALL_KINDS) { 750 case IS_METHOD: 751 case IS_CONSTRUCTOR: 752 { 753 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*"); 754 methodHandle m(THREAD, (Method*)vmtarget); 755 DEBUG_ONLY(vmtarget = NULL); // safety 756 if (m.is_null()) break; 757 if (!have_defc) { 758 InstanceKlass* defc = m->method_holder(); 759 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 760 } 761 if (!have_name) { 762 //not java_lang_String::create_from_symbol; let's intern member names 763 Handle name = StringTable::intern(m->name(), CHECK); 764 java_lang_invoke_MemberName::set_name(mname(), name()); 765 } 766 if (!have_type) { 767 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); 768 java_lang_invoke_MemberName::set_type(mname(), type()); 769 } 770 return; 771 } 772 case IS_FIELD: 773 { 774 // This is taken from LinkResolver::resolve_field, sans access checks. 775 assert(vmtarget->is_klass(), "field vmtarget is Klass*"); 776 if (!((Klass*) vmtarget)->oop_is_instance()) break; 777 instanceKlassHandle defc(THREAD, (Klass*) vmtarget); 778 DEBUG_ONLY(vmtarget = NULL); // safety 779 bool is_static = ((flags & JVM_ACC_STATIC) != 0); 780 fieldDescriptor fd; // find_field initializes fd if found 781 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) 782 break; // cannot expand 783 if (!have_defc) { 784 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 785 } 786 if (!have_name) { 787 //not java_lang_String::create_from_symbol; let's intern member names 788 Handle name = StringTable::intern(fd.name(), CHECK); 789 java_lang_invoke_MemberName::set_name(mname(), name()); 790 } 791 if (!have_type) { 792 // If it is a primitive field type, don't mess with short strings like "I". 793 Handle type = field_signature_type_or_null(fd.signature()); 794 if (type.is_null()) { 795 java_lang_String::create_from_symbol(fd.signature(), CHECK); 796 } 797 java_lang_invoke_MemberName::set_type(mname(), type()); 798 } 799 return; 800 } 801 } 802 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); 803 } 804 805 int MethodHandles::find_MemberNames(Klass* k, 806 Symbol* name, Symbol* sig, 807 int mflags, Klass* caller, 808 int skip, objArrayOop results) { 809 DEBUG_ONLY(No_Safepoint_Verifier nsv); 810 // this code contains no safepoints! 811 812 // %%% take caller into account! 813 814 if (k == NULL || !k->oop_is_instance()) return -1; 815 816 int rfill = 0, rlimit = results->length(), rskip = skip; 817 // overflow measurement: 818 int overflow = 0, overflow_limit = MAX2(1000, rlimit); 819 820 int match_flags = mflags; 821 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); 822 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); 823 bool local_only = !(search_superc | search_intfc); 824 bool classes_only = false; 825 826 if (name != NULL) { 827 if (name->utf8_length() == 0) return 0; // a match is not possible 828 } 829 if (sig != NULL) { 830 if (sig->utf8_length() == 0) return 0; // a match is not possible 831 if (sig->byte_at(0) == '(') 832 match_flags &= ~(IS_FIELD | IS_TYPE); 833 else 834 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); 835 } 836 837 if ((match_flags & IS_TYPE) != 0) { 838 // NYI, and Core Reflection works quite well for this query 839 } 840 841 if ((match_flags & IS_FIELD) != 0) { 842 for (FieldStream st(k, local_only, !search_intfc); !st.eos(); st.next()) { 843 if (name != NULL && st.name() != name) 844 continue; 845 if (sig != NULL && st.signature() != sig) 846 continue; 847 // passed the filters 848 if (rskip > 0) { 849 --rskip; 850 } else if (rfill < rlimit) { 851 oop result = results->obj_at(rfill++); 852 if (!java_lang_invoke_MemberName::is_instance(result)) 853 return -99; // caller bug! 854 oop type = field_signature_type_or_null(st.signature()); 855 oop name = field_name_or_null(st.name()); 856 oop saved = MethodHandles::init_field_MemberName(result, st.klass()(), 857 st.access_flags(), type, name, 858 st.offset()); 859 if (saved != result) 860 results->obj_at_put(rfill-1, saved); // show saved instance to user 861 } else if (++overflow >= overflow_limit) { 862 match_flags = 0; break; // got tired of looking at overflow 863 } 864 } 865 } 866 867 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { 868 // watch out for these guys: 869 Symbol* init_name = vmSymbols::object_initializer_name(); 870 Symbol* clinit_name = vmSymbols::class_initializer_name(); 871 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> 872 bool negate_name_test = false; 873 // fix name so that it captures the intention of IS_CONSTRUCTOR 874 if (!(match_flags & IS_METHOD)) { 875 // constructors only 876 if (name == NULL) { 877 name = init_name; 878 } else if (name != init_name) { 879 return 0; // no constructors of this method name 880 } 881 } else if (!(match_flags & IS_CONSTRUCTOR)) { 882 // methods only 883 if (name == NULL) { 884 name = init_name; 885 negate_name_test = true; // if we see the name, we *omit* the entry 886 } else if (name == init_name) { 887 return 0; // no methods of this constructor name 888 } 889 } else { 890 // caller will accept either sort; no need to adjust name 891 } 892 for (MethodStream st(k, local_only, !search_intfc); !st.eos(); st.next()) { 893 Method* m = st.method(); 894 Symbol* m_name = m->name(); 895 if (m_name == clinit_name) 896 continue; 897 if (name != NULL && ((m_name != name) ^ negate_name_test)) 898 continue; 899 if (sig != NULL && m->signature() != sig) 900 continue; 901 // passed the filters 902 if (rskip > 0) { 903 --rskip; 904 } else if (rfill < rlimit) { 905 oop result = results->obj_at(rfill++); 906 if (!java_lang_invoke_MemberName::is_instance(result)) 907 return -99; // caller bug! 908 oop saved = MethodHandles::init_method_MemberName(result, m, true, NULL); 909 if (saved != result) 910 results->obj_at_put(rfill-1, saved); // show saved instance to user 911 } else if (++overflow >= overflow_limit) { 912 match_flags = 0; break; // got tired of looking at overflow 913 } 914 } 915 } 916 917 // return number of elements we at leasted wanted to initialize 918 return rfill + overflow; 919 } 920 // 921 // Here are the native methods in java.lang.invoke.MethodHandleNatives 922 // They are the private interface between this JVM and the HotSpot-specific 923 // Java code that implements JSR 292 method handles. 924 // 925 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way 926 // that intrinsic (non-JNI) native methods are defined in HotSpot. 927 // 928 929 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) { 930 switch (which) { 931 case MethodHandles::GC_COUNT_GWT: 932 #ifdef COMPILER2 933 return true; 934 #else 935 return false; 936 #endif 937 } 938 return 0; 939 } 940 JVM_END 941 942 #ifndef PRODUCT 943 #define EACH_NAMED_CON(template, requirement) \ 944 template(MethodHandles,GC_COUNT_GWT) \ 945 template(java_lang_invoke_MemberName,MN_IS_METHOD) \ 946 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \ 947 template(java_lang_invoke_MemberName,MN_IS_FIELD) \ 948 template(java_lang_invoke_MemberName,MN_IS_TYPE) \ 949 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \ 950 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \ 951 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \ 952 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \ 953 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \ 954 template(MethodHandles,GC_LAMBDA_SUPPORT) \ 955 /*end*/ 956 957 #define IGNORE_REQ(req_expr) /* req_expr */ 958 #define ONE_PLUS(scope,value) 1+ 959 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0; 960 #define VALUE_COMMA(scope,value) scope::value, 961 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 }; 962 #define STRING_NULL(scope,value) #value "\0" 963 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) }; 964 965 static bool advertise_con_value(int which) { 966 if (which < 0) return false; 967 bool ok = true; 968 int count = 0; 969 #define INC_COUNT(scope,value) \ 970 ++count; 971 #define CHECK_REQ(req_expr) \ 972 if (which < count) return ok; \ 973 ok = (req_expr); 974 EACH_NAMED_CON(INC_COUNT, CHECK_REQ); 975 #undef INC_COUNT 976 #undef CHECK_REQ 977 assert(count == con_value_count, ""); 978 if (which < count) return ok; 979 return false; 980 } 981 982 #undef ONE_PLUS 983 #undef VALUE_COMMA 984 #undef STRING_NULL 985 #undef EACH_NAMED_CON 986 #endif // PRODUCT 987 988 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { 989 #ifndef PRODUCT 990 if (advertise_con_value(which)) { 991 assert(which >= 0 && which < con_value_count, ""); 992 int con = con_values[which]; 993 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh)); 994 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { 995 const char* str = &con_names[0]; 996 for (int i = 0; i < which; i++) 997 str += strlen(str) + 1; // skip name and null 998 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint 999 box->obj_at_put(0, name); 1000 } 1001 return con; 1002 } 1003 #endif 1004 return 0; 1005 } 1006 JVM_END 1007 1008 // void init(MemberName self, AccessibleObject ref) 1009 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { 1010 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1011 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); } 1012 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1013 oop target_oop = JNIHandles::resolve_non_null(target_jh); 1014 MethodHandles::init_MemberName(mname(), target_oop); 1015 } 1016 JVM_END 1017 1018 // void expand(MemberName self) 1019 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1020 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1021 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1022 MethodHandles::expand_MemberName(mname, 0, CHECK); 1023 } 1024 JVM_END 1025 1026 // void resolve(MemberName self, Class<?> caller) 1027 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { 1028 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); } 1029 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1030 1031 // The trusted Java code that calls this method should already have performed 1032 // access checks on behalf of the given caller. But, we can verify this. 1033 if (VerifyMethodHandles && caller_jh != NULL && 1034 java_lang_invoke_MemberName::clazz(mname()) != NULL) { 1035 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname())); 1036 if (reference_klass != NULL) { 1037 // Emulate LinkResolver::check_klass_accessability. 1038 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1039 if (!Reflection::verify_class_access(caller, 1040 reference_klass, 1041 true)) { 1042 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name()); 1043 } 1044 } 1045 } 1046 1047 Handle resolved = MethodHandles::resolve_MemberName(mname, CHECK_NULL); 1048 if (resolved.is_null()) { 1049 int flags = java_lang_invoke_MemberName::flags(mname()); 1050 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 1051 if (!MethodHandles::ref_kind_is_valid(ref_kind)) { 1052 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format"); 1053 } 1054 if ((flags & ALL_KINDS) == IS_FIELD) { 1055 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed"); 1056 } else if ((flags & ALL_KINDS) == IS_METHOD || 1057 (flags & ALL_KINDS) == IS_CONSTRUCTOR) { 1058 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed"); 1059 } else { 1060 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed"); 1061 } 1062 } 1063 1064 return JNIHandles::make_local(THREAD, resolved()); 1065 } 1066 JVM_END 1067 1068 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) { 1069 if (mname == NULL || 1070 java_lang_invoke_MemberName::vmtarget(mname) == NULL) { 1071 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved"); 1072 } else { 1073 int flags = java_lang_invoke_MemberName::flags(mname); 1074 if ((flags & IS_FIELD) != 0 && 1075 (must_be_static 1076 ? (flags & JVM_ACC_STATIC) != 0 1077 : (flags & JVM_ACC_STATIC) == 0)) { 1078 int vmindex = java_lang_invoke_MemberName::vmindex(mname); 1079 return (jlong) vmindex; 1080 } 1081 } 1082 const char* msg = (must_be_static ? "static field required" : "non-static field required"); 1083 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg); 1084 return 0; 1085 } 1086 1087 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1088 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD); 1089 } 1090 JVM_END 1091 1092 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1093 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD); 1094 } 1095 JVM_END 1096 1097 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1098 // use the other function to perform sanity checks: 1099 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL); 1100 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh)); 1101 return JNIHandles::make_local(THREAD, clazz); 1102 } 1103 JVM_END 1104 1105 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1106 if (mname_jh == NULL) return NULL; 1107 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1108 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()); 1109 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 1110 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL); 1111 jvalue vmindex_value; vmindex_value.j = (long)vmindex; 1112 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL); 1113 result->obj_at_put(0, x); 1114 x = NULL; 1115 if (vmtarget == NULL) { 1116 x = NULL; 1117 } else if (vmtarget->is_klass()) { 1118 x = ((Klass*) vmtarget)->java_mirror(); 1119 } else if (vmtarget->is_method()) { 1120 Handle mname2 = MethodHandles::new_MemberName(CHECK_NULL); 1121 x = MethodHandles::init_method_MemberName(mname2(), (Method*)vmtarget, false, NULL); 1122 } 1123 result->obj_at_put(1, x); 1124 return JNIHandles::make_local(env, result()); 1125 } 1126 JVM_END 1127 1128 1129 1130 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1131 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1132 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls, 1133 jclass clazz_jh, jstring name_jh, jstring sig_jh, 1134 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { 1135 if (clazz_jh == NULL || results_jh == NULL) return -1; 1136 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh))); 1137 1138 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh)); 1139 if (results.is_null() || !results->is_objArray()) return -1; 1140 1141 TempNewSymbol name = NULL; 1142 TempNewSymbol sig = NULL; 1143 if (name_jh != NULL) { 1144 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); 1145 if (name == NULL) return 0; // a match is not possible 1146 } 1147 if (sig_jh != NULL) { 1148 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); 1149 if (sig == NULL) return 0; // a match is not possible 1150 } 1151 1152 KlassHandle caller; 1153 if (caller_jh != NULL) { 1154 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); 1155 if (!java_lang_Class::is_instance(caller_oop)) return -1; 1156 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop)); 1157 } 1158 1159 if (name != NULL && sig != NULL && results.not_null()) { 1160 // try a direct resolve 1161 // %%% TO DO 1162 } 1163 1164 int res = MethodHandles::find_MemberNames(k(), name, sig, mflags, 1165 caller(), skip, results()); 1166 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks 1167 return res; 1168 } 1169 JVM_END 1170 1171 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1172 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1173 Handle target (THREAD, JNIHandles::resolve(target_jh)); 1174 { 1175 // Walk all nmethods depending on this call site. 1176 MutexLocker mu(Compile_lock, thread); 1177 Universe::flush_dependents_on(call_site, target); 1178 java_lang_invoke_CallSite::set_target(call_site(), target()); 1179 } 1180 } 1181 JVM_END 1182 1183 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1184 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1185 Handle target (THREAD, JNIHandles::resolve(target_jh)); 1186 { 1187 // Walk all nmethods depending on this call site. 1188 MutexLocker mu(Compile_lock, thread); 1189 Universe::flush_dependents_on(call_site, target); 1190 java_lang_invoke_CallSite::set_target_volatile(call_site(), target()); 1191 } 1192 } 1193 JVM_END 1194 1195 /// JVM_RegisterMethodHandleMethods 1196 1197 #undef CS // Solaris builds complain 1198 1199 #define LANG "Ljava/lang/" 1200 #define JLINV "Ljava/lang/invoke/" 1201 1202 #define OBJ LANG"Object;" 1203 #define CLS LANG"Class;" 1204 #define STRG LANG"String;" 1205 #define CS JLINV"CallSite;" 1206 #define MT JLINV"MethodType;" 1207 #define MH JLINV"MethodHandle;" 1208 #define MEM JLINV"MemberName;" 1209 1210 #define CC (char*) /*cast a literal from (const char*)*/ 1211 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1212 1213 // These are the native methods on java.lang.invoke.MethodHandleNatives. 1214 static JNINativeMethod required_methods_JDK8[] = { 1215 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)}, 1216 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)}, 1217 {CC"resolve", CC"("MEM""CLS")"MEM, FN_PTR(MHN_resolve_Mem)}, 1218 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)}, 1219 // static native int getNamedCon(int which, Object[] name) 1220 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)}, 1221 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1222 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1223 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)}, 1224 {CC"objectFieldOffset", CC"("MEM")J", FN_PTR(MHN_objectFieldOffset)}, 1225 {CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)}, 1226 {CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)}, 1227 {CC"staticFieldOffset", CC"("MEM")J", FN_PTR(MHN_staticFieldOffset)}, 1228 {CC"staticFieldBase", CC"("MEM")"OBJ, FN_PTR(MHN_staticFieldBase)}, 1229 {CC"getMemberVMInfo", CC"("MEM")"OBJ, FN_PTR(MHN_getMemberVMInfo)} 1230 }; 1231 1232 // This one function is exported, used by NativeLookup. 1233 1234 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { 1235 if (!EnableInvokeDynamic) { 1236 warning("JSR 292 is disabled in this JVM. Use -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic to enable."); 1237 return; // bind nothing 1238 } 1239 1240 assert(!MethodHandles::enabled(), "must not be enabled"); 1241 bool enable_MH = true; 1242 1243 jclass MH_class = NULL; 1244 if (SystemDictionary::MethodHandle_klass() == NULL) { 1245 enable_MH = false; 1246 } else { 1247 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror(); 1248 MH_class = (jclass) JNIHandles::make_local(env, mirror); 1249 } 1250 1251 int status; 1252 1253 if (enable_MH) { 1254 ThreadToNativeFromVM ttnfv(thread); 1255 1256 status = env->RegisterNatives(MHN_class, required_methods_JDK8, sizeof(required_methods_JDK8)/sizeof(JNINativeMethod)); 1257 if (status != JNI_OK || env->ExceptionOccurred()) { 1258 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); 1259 enable_MH = false; 1260 env->ExceptionClear(); 1261 } 1262 } 1263 1264 if (TraceInvokeDynamic) { 1265 tty->print_cr("MethodHandle support loaded (using LambdaForms)"); 1266 } 1267 1268 if (enable_MH) { 1269 MethodHandles::generate_adapters(); 1270 MethodHandles::set_enabled(true); 1271 } 1272 } 1273 JVM_END