1 /* 2 * Copyright (c) 2008, 2018, 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/javaClasses.inline.hpp" 27 #include "classfile/stringTable.hpp" 28 #include "code/codeCache.hpp" 29 #include "code/dependencyContext.hpp" 30 #include "compiler/compileBroker.hpp" 31 #include "interpreter/interpreter.hpp" 32 #include "interpreter/oopMapCache.hpp" 33 #include "interpreter/linkResolver.hpp" 34 #include "memory/allocation.inline.hpp" 35 #include "memory/oopFactory.hpp" 36 #include "memory/resourceArea.hpp" 37 #include "oops/objArrayOop.inline.hpp" 38 #include "oops/oop.inline.hpp" 39 #include "oops/typeArrayOop.inline.hpp" 40 #include "prims/methodHandles.hpp" 41 #include "runtime/compilationPolicy.hpp" 42 #include "runtime/javaCalls.hpp" 43 #include "runtime/jniHandles.inline.hpp" 44 #include "runtime/timerTrace.hpp" 45 #include "runtime/reflection.hpp" 46 #include "runtime/signature.hpp" 47 #include "runtime/stubRoutines.hpp" 48 #include "utilities/exceptions.hpp" 49 50 51 /* 52 * JSR 292 reference implementation: method handles 53 * The JDK 7 reference implementation represented method handle 54 * combinations as chains. Each link in the chain had a "vmentry" 55 * field which pointed at a bit of assembly code which performed 56 * one transformation before dispatching to the next link in the chain. 57 * 58 * The current reference implementation pushes almost all code generation 59 * responsibility to (trusted) Java code. A method handle contains a 60 * pointer to its "LambdaForm", which embodies all details of the method 61 * handle's behavior. The LambdaForm is a normal Java object, managed 62 * by a runtime coded in Java. 63 */ 64 65 bool MethodHandles::_enabled = false; // set true after successful native linkage 66 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL; 67 68 /** 69 * Generates method handle adapters. Returns 'false' if memory allocation 70 * failed and true otherwise. 71 */ 72 void MethodHandles::generate_adapters() { 73 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present"); 74 assert(_adapter_code == NULL, "generate only once"); 75 76 ResourceMark rm; 77 TraceTime timer("MethodHandles adapters generation", TRACETIME_LOG(Info, startuptime)); 78 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size); 79 CodeBuffer code(_adapter_code); 80 MethodHandlesAdapterGenerator g(&code); 81 g.generate(); 82 code.log_section_sizes("MethodHandlesAdapterBlob"); 83 } 84 85 //------------------------------------------------------------------------------ 86 // MethodHandlesAdapterGenerator::generate 87 // 88 void MethodHandlesAdapterGenerator::generate() { 89 // Generate generic method handle adapters. 90 // Generate interpreter entries 91 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST; 92 mk <= Interpreter::method_handle_invoke_LAST; 93 mk = Interpreter::MethodKind(1 + (int)mk)) { 94 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk); 95 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid)); 96 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid); 97 if (entry != NULL) { 98 Interpreter::set_entry_for_kind(mk, entry); 99 } 100 // If the entry is not set, it will throw AbstractMethodError. 101 } 102 } 103 104 void MethodHandles::set_enabled(bool z) { 105 if (_enabled != z) { 106 guarantee(z, "can only enable once"); 107 _enabled = z; 108 } 109 } 110 111 // MemberName support 112 113 // import java_lang_invoke_MemberName.* 114 enum { 115 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD, 116 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR, 117 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD, 118 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE, 119 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE, 120 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, 121 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, 122 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES, 123 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES, 124 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE 125 }; 126 127 int MethodHandles::ref_kind_to_flags(int ref_kind) { 128 assert(ref_kind_is_valid(ref_kind), "%d", ref_kind); 129 int flags = (ref_kind << REFERENCE_KIND_SHIFT); 130 if (ref_kind_is_field(ref_kind)) { 131 flags |= IS_FIELD; 132 } else if (ref_kind_is_method(ref_kind)) { 133 flags |= IS_METHOD; 134 } else if (ref_kind == JVM_REF_newInvokeSpecial) { 135 flags |= IS_CONSTRUCTOR; 136 } 137 return flags; 138 } 139 140 Handle MethodHandles::resolve_MemberName_type(Handle mname, Klass* caller, TRAPS) { 141 Handle empty; 142 Handle type(THREAD, java_lang_invoke_MemberName::type(mname())); 143 if (!java_lang_String::is_instance_inlined(type())) { 144 return type; // already resolved 145 } 146 Symbol* signature = java_lang_String::as_symbol_or_null(type()); 147 if (signature == NULL) { 148 return empty; // no such signature exists in the VM 149 } 150 Handle resolved; 151 int flags = java_lang_invoke_MemberName::flags(mname()); 152 switch (flags & ALL_KINDS) { 153 case IS_METHOD: 154 case IS_CONSTRUCTOR: 155 resolved = SystemDictionary::find_method_handle_type(signature, caller, CHECK_(empty)); 156 break; 157 case IS_FIELD: 158 resolved = SystemDictionary::find_field_handle_type(signature, caller, CHECK_(empty)); 159 break; 160 default: 161 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 162 } 163 if (resolved.is_null()) { 164 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MemberName type", empty); 165 } 166 return resolved; 167 } 168 169 oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) { 170 // This method is used from java.lang.invoke.MemberName constructors. 171 // It fills in the new MemberName from a java.lang.reflect.Member. 172 Thread* thread = Thread::current(); 173 oop target_oop = target(); 174 Klass* target_klass = target_oop->klass(); 175 if (target_klass == SystemDictionary::reflect_Field_klass()) { 176 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() 177 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() 178 Klass* k = java_lang_Class::as_Klass(clazz); 179 if (k != NULL && k->is_instance_klass()) { 180 fieldDescriptor fd(InstanceKlass::cast(k), slot); 181 oop mname2 = init_field_MemberName(mname, fd); 182 if (mname2 != NULL) { 183 // Since we have the reified name and type handy, add them to the result. 184 if (java_lang_invoke_MemberName::name(mname2) == NULL) 185 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop)); 186 if (java_lang_invoke_MemberName::type(mname2) == NULL) 187 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop)); 188 } 189 return mname2; 190 } 191 } else if (target_klass == SystemDictionary::reflect_Method_klass()) { 192 oop clazz = java_lang_reflect_Method::clazz(target_oop); 193 int slot = java_lang_reflect_Method::slot(target_oop); 194 Klass* k = java_lang_Class::as_Klass(clazz); 195 if (k != NULL && k->is_instance_klass()) { 196 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 197 if (m == NULL || is_signature_polymorphic(m->intrinsic_id())) 198 return NULL; // do not resolve unless there is a concrete signature 199 CallInfo info(m, k, CHECK_NULL); 200 return init_method_MemberName(mname, info); 201 } 202 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) { 203 oop clazz = java_lang_reflect_Constructor::clazz(target_oop); 204 int slot = java_lang_reflect_Constructor::slot(target_oop); 205 Klass* k = java_lang_Class::as_Klass(clazz); 206 if (k != NULL && k->is_instance_klass()) { 207 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 208 if (m == NULL) return NULL; 209 CallInfo info(m, k, CHECK_NULL); 210 return init_method_MemberName(mname, info); 211 } 212 } 213 return NULL; 214 } 215 216 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) { 217 assert(info.resolved_appendix().is_null(), "only normal methods here"); 218 methodHandle m = info.resolved_method(); 219 assert(m.not_null(), "null method handle"); 220 Klass* m_klass = m->method_holder(); 221 assert(m_klass != NULL, "null holder for method handle"); 222 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ); 223 int vmindex = Method::invalid_vtable_index; 224 225 switch (info.call_kind()) { 226 case CallInfo::itable_call: 227 vmindex = info.itable_index(); 228 // More importantly, the itable index only works with the method holder. 229 assert(m_klass->verify_itable_index(vmindex), ""); 230 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT); 231 if (TraceInvokeDynamic) { 232 ttyLocker ttyl; 233 ResourceMark rm; 234 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:", 235 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 236 vmindex); 237 m->access_flags().print_on(tty); 238 if (!m->is_abstract()) { 239 tty->print("default"); 240 } 241 tty->cr(); 242 } 243 break; 244 245 case CallInfo::vtable_call: 246 vmindex = info.vtable_index(); 247 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT); 248 assert(info.resolved_klass()->is_subtype_of(m_klass), "virtual call must be type-safe"); 249 if (m_klass->is_interface()) { 250 // This is a vtable call to an interface method (abstract "miranda method" or default method). 251 // The vtable index is meaningless without a class (not interface) receiver type, so get one. 252 // (LinkResolver should help us figure this out.) 253 Klass* m_klass_non_interface = info.resolved_klass(); 254 if (m_klass_non_interface->is_interface()) { 255 m_klass_non_interface = SystemDictionary::Object_klass(); 256 #ifdef ASSERT 257 { ResourceMark rm; 258 Method* m2 = m_klass_non_interface->vtable().method_at(vmindex); 259 assert(m->name() == m2->name() && m->signature() == m2->signature(), 260 "at %d, %s != %s", vmindex, 261 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()); 262 } 263 #endif //ASSERT 264 } 265 if (!m->is_public()) { 266 assert(m->is_public(), "virtual call must be to public interface method"); 267 return NULL; // elicit an error later in product build 268 } 269 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface), "virtual call must be type-safe"); 270 m_klass = m_klass_non_interface; 271 } 272 if (TraceInvokeDynamic) { 273 ttyLocker ttyl; 274 ResourceMark rm; 275 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:", 276 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 277 m_klass->internal_name(), vmindex); 278 m->access_flags().print_on(tty); 279 if (m->is_default_method()) { 280 tty->print("default"); 281 } 282 tty->cr(); 283 } 284 break; 285 286 case CallInfo::direct_call: 287 vmindex = Method::nonvirtual_vtable_index; 288 if (m->is_static()) { 289 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT); 290 } else if (m->is_initializer()) { 291 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 292 } else { 293 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 294 } 295 break; 296 297 default: assert(false, "bad CallInfo"); return NULL; 298 } 299 300 // @CallerSensitive annotation detected 301 if (m->caller_sensitive()) { 302 flags |= CALLER_SENSITIVE; 303 } 304 305 Handle resolved_method = info.resolved_method_name(); 306 assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m(), 307 "Should not change after link resolultion"); 308 309 oop mname_oop = mname(); 310 java_lang_invoke_MemberName::set_flags (mname_oop, flags); 311 java_lang_invoke_MemberName::set_method (mname_oop, resolved_method()); 312 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index 313 java_lang_invoke_MemberName::set_clazz (mname_oop, m_klass->java_mirror()); 314 // Note: name and type can be lazily computed by resolve_MemberName, 315 // if Java code needs them as resolved String and MethodType objects. 316 // If relevant, the vtable or itable value is stored as vmindex. 317 // This is done eagerly, since it is readily available without 318 // constructing any new objects. 319 return mname(); 320 } 321 322 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) { 323 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ); 324 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT); 325 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT); 326 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit 327 328 oop mname_oop = mname(); 329 java_lang_invoke_MemberName::set_flags (mname_oop, flags); 330 java_lang_invoke_MemberName::set_method (mname_oop, NULL); 331 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); 332 java_lang_invoke_MemberName::set_clazz (mname_oop, fd.field_holder()->java_mirror()); 333 334 oop type = field_signature_type_or_null(fd.signature()); 335 oop name = field_name_or_null(fd.name()); 336 if (name != NULL) 337 java_lang_invoke_MemberName::set_name(mname_oop, name); 338 if (type != NULL) 339 java_lang_invoke_MemberName::set_type(mname_oop, type); 340 // Note: name and type can be lazily computed by resolve_MemberName, 341 // if Java code needs them as resolved String and Class objects. 342 // Note that the incoming type oop might be pre-resolved (non-null). 343 // The base clazz and field offset (vmindex) must be eagerly stored, 344 // because they unambiguously identify the field. 345 // Although the fieldDescriptor::_index would also identify the field, 346 // we do not use it, because it is harder to decode. 347 // TO DO: maybe intern mname_oop 348 return mname(); 349 } 350 351 // JVM 2.9 Special Methods: 352 // A method is signature polymorphic if and only if all of the following conditions hold : 353 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes. 354 // * It has a single formal parameter of type Object[]. 355 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type. 356 // * It has the ACC_VARARGS and ACC_NATIVE flags set. 357 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) { 358 if (klass == NULL) 359 return false; 360 // The following test will fail spuriously during bootstrap of MethodHandle itself: 361 // if (klass != SystemDictionary::MethodHandle_klass()) 362 // Test the name instead: 363 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() && 364 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) { 365 return false; 366 } 367 368 // Look up signature polymorphic method with polymorphic return type 369 Symbol* poly_sig = vmSymbols::object_array_object_signature(); 370 InstanceKlass* iklass = InstanceKlass::cast(klass); 371 Method* m = iklass->find_method(name, poly_sig); 372 if (m != NULL) { 373 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 374 int flags = m->access_flags().as_int(); 375 if ((flags & required) == required) { 376 return true; 377 } 378 } 379 380 // Look up signature polymorphic method with non-polymorphic (non Object) return type 381 int me; 382 int ms = iklass->find_method_by_name(name, &me); 383 if (ms == -1) return false; 384 for (; ms < me; ms++) { 385 Method* m = iklass->methods()->at(ms); 386 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 387 int flags = m->access_flags().as_int(); 388 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) { 389 return true; 390 } 391 } 392 return false; 393 } 394 395 396 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) { 397 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid)); 398 switch (iid) { 399 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name(); 400 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name(); 401 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name(); 402 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name(); 403 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name(); 404 default: 405 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid)); 406 return 0; 407 } 408 } 409 410 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) { 411 switch(id) { 412 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual; 413 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface; 414 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic; 415 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial; 416 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle; 417 default: 418 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id)); 419 return Bytecodes::_illegal; 420 } 421 } 422 423 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) { 424 switch (iid) { 425 case vmIntrinsics::_invokeBasic: return 0; 426 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual; 427 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic; 428 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial; 429 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface; 430 default: 431 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid)); 432 return 0; 433 } 434 } 435 436 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) { 437 vmSymbols::SID name_id = vmSymbols::find_sid(name); 438 switch (name_id) { 439 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins. 440 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric; 441 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic: 442 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic; 443 444 // There is one static signature-polymorphic method for each JVM invocation mode. 445 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual; 446 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic; 447 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial; 448 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface; 449 default: break; 450 } 451 452 // Cover the case of invokeExact and any future variants of invokeFoo. 453 Klass* mh_klass = SystemDictionary::well_known_klass( 454 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) ); 455 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) { 456 return vmIntrinsics::_invokeGeneric; 457 } 458 459 // Cover the case of methods on VarHandle. 460 Klass* vh_klass = SystemDictionary::well_known_klass( 461 SystemDictionary::WK_KLASS_ENUM_NAME(VarHandle_klass) ); 462 if (vh_klass != NULL && is_method_handle_invoke_name(vh_klass, name)) { 463 return vmIntrinsics::_invokeGeneric; 464 } 465 466 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against. 467 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic. 468 return vmIntrinsics::_none; 469 } 470 471 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) { 472 if (klass != NULL && 473 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() || 474 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) { 475 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 476 if (iid != vmIntrinsics::_none) 477 return iid; 478 if (is_method_handle_invoke_name(klass, name)) 479 return vmIntrinsics::_invokeGeneric; 480 } 481 return vmIntrinsics::_none; 482 } 483 484 485 // convert the external string or reflective type to an internal signature 486 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) { 487 if (java_lang_invoke_MethodType::is_instance(type_str)) { 488 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD); 489 } else if (java_lang_Class::is_instance(type_str)) { 490 return java_lang_Class::as_signature(type_str, false, THREAD); 491 } else if (java_lang_String::is_instance_inlined(type_str)) { 492 if (intern_if_not_found) { 493 return java_lang_String::as_symbol(type_str, THREAD); 494 } else { 495 return java_lang_String::as_symbol_or_null(type_str); 496 } 497 } else { 498 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL); 499 } 500 } 501 502 static const char OBJ_SIG[] = "Ljava/lang/Object;"; 503 enum { OBJ_SIG_LEN = 18 }; 504 505 bool MethodHandles::is_basic_type_signature(Symbol* sig) { 506 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, ""); 507 assert(vmSymbols::object_signature()->equals(OBJ_SIG), ""); 508 const int len = sig->utf8_length(); 509 for (int i = 0; i < len; i++) { 510 switch (sig->byte_at(i)) { 511 case 'L': 512 // only java/lang/Object is valid here 513 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i) 514 return false; 515 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop 516 continue; 517 case '(': case ')': case 'V': 518 case 'I': case 'J': case 'F': case 'D': 519 continue; 520 //case '[': 521 //case 'Z': case 'B': case 'C': case 'S': 522 default: 523 return false; 524 } 525 } 526 return true; 527 } 528 529 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) { 530 Symbol* bsig = NULL; 531 if (sig == NULL) { 532 return sig; 533 } else if (is_basic_type_signature(sig)) { 534 sig->increment_refcount(); 535 return sig; // that was easy 536 } else if (sig->byte_at(0) != '(') { 537 BasicType bt = char2type(sig->byte_at(0)); 538 if (is_subword_type(bt)) { 539 bsig = vmSymbols::int_signature(); 540 } else { 541 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false"); 542 bsig = vmSymbols::object_signature(); 543 } 544 } else { 545 ResourceMark rm; 546 stringStream buffer(128); 547 buffer.put('('); 548 int arg_pos = 0, keep_arg_pos = -1; 549 if (keep_last_arg) 550 keep_arg_pos = ArgumentCount(sig).size() - 1; 551 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) { 552 BasicType bt = ss.type(); 553 size_t this_arg_pos = buffer.size(); 554 if (ss.at_return_type()) { 555 buffer.put(')'); 556 } 557 if (arg_pos == keep_arg_pos) { 558 buffer.write((char*) ss.raw_bytes(), 559 (int) ss.raw_length()); 560 } else if (bt == T_OBJECT || bt == T_ARRAY) { 561 buffer.write(OBJ_SIG, OBJ_SIG_LEN); 562 } else { 563 if (is_subword_type(bt)) 564 bt = T_INT; 565 buffer.put(type2char(bt)); 566 } 567 arg_pos++; 568 } 569 const char* sigstr = buffer.base(); 570 int siglen = (int) buffer.size(); 571 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD); 572 } 573 assert(is_basic_type_signature(bsig) || 574 // detune assert in case the injected argument is not a basic type: 575 keep_last_arg, ""); 576 return bsig; 577 } 578 579 void MethodHandles::print_as_basic_type_signature_on(outputStream* st, 580 Symbol* sig, 581 bool keep_arrays, 582 bool keep_basic_names) { 583 st = st ? st : tty; 584 int len = sig->utf8_length(); 585 int array = 0; 586 bool prev_type = false; 587 for (int i = 0; i < len; i++) { 588 char ch = sig->byte_at(i); 589 switch (ch) { 590 case '(': case ')': 591 prev_type = false; 592 st->put(ch); 593 continue; 594 case '[': 595 if (!keep_basic_names && keep_arrays) 596 st->put(ch); 597 array++; 598 continue; 599 case 'L': 600 { 601 if (prev_type) st->put(','); 602 int start = i+1, slash = start; 603 while (++i < len && (ch = sig->byte_at(i)) != ';') { 604 if (ch == '/' || ch == '.' || ch == '$') slash = i+1; 605 } 606 if (slash < i) start = slash; 607 if (!keep_basic_names) { 608 st->put('L'); 609 } else { 610 for (int j = start; j < i; j++) 611 st->put(sig->byte_at(j)); 612 prev_type = true; 613 } 614 break; 615 } 616 default: 617 { 618 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) { 619 ch = '['; 620 array = 0; 621 } 622 if (prev_type) st->put(','); 623 const char* n = NULL; 624 if (keep_basic_names) 625 n = type2name(char2type(ch)); 626 if (n == NULL) { 627 // unknown letter, or we don't want to know its name 628 st->put(ch); 629 } else { 630 st->print("%s", n); 631 prev_type = true; 632 } 633 break; 634 } 635 } 636 // Switch break goes here to take care of array suffix: 637 if (prev_type) { 638 while (array > 0) { 639 st->print("[]"); 640 --array; 641 } 642 } 643 array = 0; 644 } 645 } 646 647 648 649 static oop object_java_mirror() { 650 return SystemDictionary::Object_klass()->java_mirror(); 651 } 652 653 oop MethodHandles::field_name_or_null(Symbol* s) { 654 if (s == NULL) return NULL; 655 return StringTable::lookup(s); 656 } 657 658 oop MethodHandles::field_signature_type_or_null(Symbol* s) { 659 if (s == NULL) return NULL; 660 BasicType bt = FieldType::basic_type(s); 661 if (is_java_primitive(bt)) { 662 assert(s->utf8_length() == 1, ""); 663 return java_lang_Class::primitive_mirror(bt); 664 } 665 // Here are some more short cuts for common types. 666 // They are optional, since reference types can be resolved lazily. 667 if (bt == T_OBJECT) { 668 if (s == vmSymbols::object_signature()) { 669 return object_java_mirror(); 670 } else if (s == vmSymbols::class_signature()) { 671 return SystemDictionary::Class_klass()->java_mirror(); 672 } else if (s == vmSymbols::string_signature()) { 673 return SystemDictionary::String_klass()->java_mirror(); 674 } 675 } 676 return NULL; 677 } 678 679 680 // An unresolved member name is a mere symbolic reference. 681 // Resolving it plants a vmtarget/vmindex in it, 682 // which refers directly to JVM internals. 683 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller, TRAPS) { 684 Handle empty; 685 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 686 687 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) { 688 // Already resolved. 689 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname())); 690 assert(vmindex >= Method::nonvirtual_vtable_index, ""); 691 return mname; 692 } 693 694 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname())); 695 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname())); 696 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname())); 697 int flags = java_lang_invoke_MemberName::flags(mname()); 698 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 699 if (!ref_kind_is_valid(ref_kind)) { 700 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty); 701 } 702 703 DEBUG_ONLY(int old_vmindex); 704 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input"); 705 706 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) { 707 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty); 708 } 709 710 InstanceKlass* defc = NULL; 711 { 712 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop()); 713 if (defc_klass == NULL) return empty; // a primitive; no resolution possible 714 if (!defc_klass->is_instance_klass()) { 715 if (!defc_klass->is_array_klass()) return empty; 716 defc_klass = SystemDictionary::Object_klass(); 717 } 718 defc = InstanceKlass::cast(defc_klass); 719 } 720 if (defc == NULL) { 721 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty); 722 } 723 defc->link_class(CHECK_(empty)); // possible safepoint 724 725 // convert the external string name to an internal symbol 726 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str()); 727 if (name == NULL) return empty; // no such name 728 if (name == vmSymbols::class_initializer_name()) 729 return empty; // illegal name 730 731 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none; 732 if ((flags & ALL_KINDS) == IS_METHOD && 733 (defc == SystemDictionary::MethodHandle_klass()) && 734 (ref_kind == JVM_REF_invokeVirtual || 735 ref_kind == JVM_REF_invokeSpecial || 736 // static invocation mode is required for _linkToVirtual, etc.: 737 ref_kind == JVM_REF_invokeStatic)) { 738 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 739 if (iid != vmIntrinsics::_none && 740 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) { 741 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic. 742 // For a static reference it could an internal linkage routine like _linkToVirtual, etc. 743 mh_invoke_id = iid; 744 } 745 } 746 747 // convert the external string or reflective type to an internal signature 748 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty)); 749 if (type == NULL) return empty; // no such signature exists in the VM 750 751 LinkInfo::AccessCheck access_check = caller != NULL ? 752 LinkInfo::needs_access_check : 753 LinkInfo::skip_access_check; 754 755 // Time to do the lookup. 756 switch (flags & ALL_KINDS) { 757 case IS_METHOD: 758 { 759 CallInfo result; 760 LinkInfo link_info(defc, name, type, caller, access_check); 761 { 762 assert(!HAS_PENDING_EXCEPTION, ""); 763 if (ref_kind == JVM_REF_invokeStatic) { 764 LinkResolver::resolve_static_call(result, 765 link_info, false, THREAD); 766 } else if (ref_kind == JVM_REF_invokeInterface) { 767 LinkResolver::resolve_interface_call(result, Handle(), defc, 768 link_info, false, THREAD); 769 } else if (mh_invoke_id != vmIntrinsics::_none) { 770 assert(!is_signature_polymorphic_static(mh_invoke_id), ""); 771 LinkResolver::resolve_handle_call(result, link_info, THREAD); 772 } else if (ref_kind == JVM_REF_invokeSpecial) { 773 LinkResolver::resolve_special_call(result, Handle(), 774 link_info, THREAD); 775 } else if (ref_kind == JVM_REF_invokeVirtual) { 776 LinkResolver::resolve_virtual_call(result, Handle(), defc, 777 link_info, false, THREAD); 778 } else { 779 assert(false, "ref_kind=%d", ref_kind); 780 } 781 if (HAS_PENDING_EXCEPTION) { 782 return empty; 783 } 784 } 785 if (result.resolved_appendix().not_null()) { 786 // The resolved MemberName must not be accompanied by an appendix argument, 787 // since there is no way to bind this value into the MemberName. 788 // Caller is responsible to prevent this from happening. 789 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty); 790 } 791 result.set_resolved_method_name(CHECK_(empty)); 792 oop mname2 = init_method_MemberName(mname, result); 793 return Handle(THREAD, mname2); 794 } 795 case IS_CONSTRUCTOR: 796 { 797 CallInfo result; 798 LinkInfo link_info(defc, name, type, caller, access_check); 799 { 800 assert(!HAS_PENDING_EXCEPTION, ""); 801 if (name == vmSymbols::object_initializer_name()) { 802 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD); 803 } else { 804 break; // will throw after end of switch 805 } 806 if (HAS_PENDING_EXCEPTION) { 807 return empty; 808 } 809 } 810 assert(result.is_statically_bound(), ""); 811 result.set_resolved_method_name(CHECK_(empty)); 812 oop mname2 = init_method_MemberName(mname, result); 813 return Handle(THREAD, mname2); 814 } 815 case IS_FIELD: 816 { 817 fieldDescriptor result; // find_field initializes fd if found 818 { 819 assert(!HAS_PENDING_EXCEPTION, ""); 820 LinkInfo link_info(defc, name, type, caller, LinkInfo::skip_access_check); 821 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD); 822 if (HAS_PENDING_EXCEPTION) { 823 return empty; 824 } 825 } 826 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind)); 827 return Handle(THREAD, mname2); 828 } 829 default: 830 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 831 } 832 833 return empty; 834 } 835 836 // Conversely, a member name which is only initialized from JVM internals 837 // may have null defc, name, and type fields. 838 // Resolving it plants a vmtarget/vmindex in it, 839 // which refers directly to JVM internals. 840 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { 841 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 842 843 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL); 844 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL); 845 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL); 846 int flags = java_lang_invoke_MemberName::flags(mname()); 847 848 if (suppress != 0) { 849 if (suppress & _suppress_defc) have_defc = true; 850 if (suppress & _suppress_name) have_name = true; 851 if (suppress & _suppress_type) have_type = true; 852 } 853 854 if (have_defc && have_name && have_type) return; // nothing needed 855 856 switch (flags & ALL_KINDS) { 857 case IS_METHOD: 858 case IS_CONSTRUCTOR: 859 { 860 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 861 if (vmtarget == NULL) { 862 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); 863 } 864 methodHandle m(THREAD, vmtarget); 865 DEBUG_ONLY(vmtarget = NULL); // safety 866 if (!have_defc) { 867 InstanceKlass* defc = m->method_holder(); 868 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 869 } 870 if (!have_name) { 871 //not java_lang_String::create_from_symbol; let's intern member names 872 oop name = StringTable::intern(m->name(), CHECK); 873 java_lang_invoke_MemberName::set_name(mname(), name); 874 } 875 if (!have_type) { 876 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); 877 java_lang_invoke_MemberName::set_type(mname(), type()); 878 } 879 return; 880 } 881 case IS_FIELD: 882 { 883 oop clazz = java_lang_invoke_MemberName::clazz(mname()); 884 if (clazz == NULL) { 885 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)"); 886 } 887 InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz)); 888 DEBUG_ONLY(clazz = NULL); // safety 889 int vmindex = java_lang_invoke_MemberName::vmindex(mname()); 890 bool is_static = ((flags & JVM_ACC_STATIC) != 0); 891 fieldDescriptor fd; // find_field initializes fd if found 892 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) 893 break; // cannot expand 894 if (!have_name) { 895 //not java_lang_String::create_from_symbol; let's intern member names 896 oop name = StringTable::intern(fd.name(), CHECK); 897 java_lang_invoke_MemberName::set_name(mname(), name); 898 } 899 if (!have_type) { 900 // If it is a primitive field type, don't mess with short strings like "I". 901 Handle type (THREAD, field_signature_type_or_null(fd.signature())); 902 if (type.is_null()) { 903 type = java_lang_String::create_from_symbol(fd.signature(), CHECK); 904 } 905 java_lang_invoke_MemberName::set_type(mname(), type()); 906 } 907 return; 908 } 909 } 910 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); 911 } 912 913 int MethodHandles::find_MemberNames(Klass* k, 914 Symbol* name, Symbol* sig, 915 int mflags, Klass* caller, 916 int skip, objArrayHandle results, TRAPS) { 917 // %%% take caller into account! 918 919 Thread* thread = Thread::current(); 920 921 if (k == NULL || !k->is_instance_klass()) return -1; 922 923 int rfill = 0, rlimit = results->length(), rskip = skip; 924 // overflow measurement: 925 int overflow = 0, overflow_limit = MAX2(1000, rlimit); 926 927 int match_flags = mflags; 928 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); 929 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); 930 bool local_only = !(search_superc | search_intfc); 931 bool classes_only = false; 932 933 if (name != NULL) { 934 if (name->utf8_length() == 0) return 0; // a match is not possible 935 } 936 if (sig != NULL) { 937 if (sig->utf8_length() == 0) return 0; // a match is not possible 938 if (sig->byte_at(0) == '(') 939 match_flags &= ~(IS_FIELD | IS_TYPE); 940 else 941 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); 942 } 943 944 if ((match_flags & IS_TYPE) != 0) { 945 // NYI, and Core Reflection works quite well for this query 946 } 947 948 if ((match_flags & IS_FIELD) != 0) { 949 InstanceKlass* ik = InstanceKlass::cast(k); 950 for (FieldStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) { 951 if (name != NULL && st.name() != name) 952 continue; 953 if (sig != NULL && st.signature() != sig) 954 continue; 955 // passed the filters 956 if (rskip > 0) { 957 --rskip; 958 } else if (rfill < rlimit) { 959 Handle result(thread, results->obj_at(rfill++)); 960 if (!java_lang_invoke_MemberName::is_instance(result())) 961 return -99; // caller bug! 962 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor()); 963 if (saved != result()) 964 results->obj_at_put(rfill-1, saved); // show saved instance to user 965 } else if (++overflow >= overflow_limit) { 966 match_flags = 0; break; // got tired of looking at overflow 967 } 968 } 969 } 970 971 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { 972 // watch out for these guys: 973 Symbol* init_name = vmSymbols::object_initializer_name(); 974 Symbol* clinit_name = vmSymbols::class_initializer_name(); 975 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> 976 bool negate_name_test = false; 977 // fix name so that it captures the intention of IS_CONSTRUCTOR 978 if (!(match_flags & IS_METHOD)) { 979 // constructors only 980 if (name == NULL) { 981 name = init_name; 982 } else if (name != init_name) { 983 return 0; // no constructors of this method name 984 } 985 } else if (!(match_flags & IS_CONSTRUCTOR)) { 986 // methods only 987 if (name == NULL) { 988 name = init_name; 989 negate_name_test = true; // if we see the name, we *omit* the entry 990 } else if (name == init_name) { 991 return 0; // no methods of this constructor name 992 } 993 } else { 994 // caller will accept either sort; no need to adjust name 995 } 996 InstanceKlass* ik = InstanceKlass::cast(k); 997 for (MethodStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) { 998 Method* m = st.method(); 999 Symbol* m_name = m->name(); 1000 if (m_name == clinit_name) 1001 continue; 1002 if (name != NULL && ((m_name != name) ^ negate_name_test)) 1003 continue; 1004 if (sig != NULL && m->signature() != sig) 1005 continue; 1006 // passed the filters 1007 if (rskip > 0) { 1008 --rskip; 1009 } else if (rfill < rlimit) { 1010 Handle result(thread, results->obj_at(rfill++)); 1011 if (!java_lang_invoke_MemberName::is_instance(result())) 1012 return -99; // caller bug! 1013 CallInfo info(m, NULL, CHECK_0); 1014 oop saved = MethodHandles::init_method_MemberName(result, info); 1015 if (saved != result()) 1016 results->obj_at_put(rfill-1, saved); // show saved instance to user 1017 } else if (++overflow >= overflow_limit) { 1018 match_flags = 0; break; // got tired of looking at overflow 1019 } 1020 } 1021 } 1022 1023 // return number of elements we at leasted wanted to initialize 1024 return rfill + overflow; 1025 } 1026 1027 // Is it safe to remove stale entries from a dependency list? 1028 static bool safe_to_expunge() { 1029 // Since parallel GC threads can concurrently iterate over a dependency 1030 // list during safepoint, it is safe to remove entries only when 1031 // CodeCache lock is held. 1032 return CodeCache_lock->owned_by_self(); 1033 } 1034 1035 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) { 1036 assert_locked_or_safepoint(CodeCache_lock); 1037 1038 oop context = java_lang_invoke_CallSite::context(call_site); 1039 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 1040 // Try to purge stale entries on updates. 1041 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects, 1042 // in order to avoid memory leak, stale entries are purged whenever a dependency list 1043 // is changed (both on addition and removal). Though memory reclamation is delayed, 1044 // it avoids indefinite memory usage growth. 1045 deps.add_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge()); 1046 } 1047 1048 void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) { 1049 assert_locked_or_safepoint(CodeCache_lock); 1050 1051 oop context = java_lang_invoke_CallSite::context(call_site); 1052 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 1053 deps.remove_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge()); 1054 } 1055 1056 void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) { 1057 assert_lock_strong(Compile_lock); 1058 1059 int marked = 0; 1060 CallSiteDepChange changes(call_site, target); 1061 { 1062 NoSafepointVerifier nsv; 1063 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1064 1065 oop context = java_lang_invoke_CallSite::context(call_site()); 1066 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 1067 marked = deps.mark_dependent_nmethods(changes); 1068 } 1069 if (marked > 0) { 1070 // At least one nmethod has been marked for deoptimization. 1071 VM_Deoptimize op; 1072 VMThread::execute(&op); 1073 } 1074 } 1075 1076 void MethodHandles::trace_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid) { 1077 if (TraceMethodHandles) { 1078 const char* name = vmIntrinsics::name_at(iid); 1079 if (*name == '_') name += 1; 1080 const size_t len = strlen(name) + 50; 1081 char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal); 1082 const char* suffix = ""; 1083 if (is_signature_polymorphic(iid)) { 1084 if (is_signature_polymorphic_static(iid)) 1085 suffix = "/static"; 1086 else 1087 suffix = "/private"; 1088 } 1089 jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix); 1090 trace_method_handle(_masm, qname); 1091 // Note: Don't free the allocated char array because it's used 1092 // during runtime. 1093 } 1094 } 1095 1096 // 1097 // Here are the native methods in java.lang.invoke.MethodHandleNatives 1098 // They are the private interface between this JVM and the HotSpot-specific 1099 // Java code that implements JSR 292 method handles. 1100 // 1101 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way 1102 // that intrinsic (non-JNI) native methods are defined in HotSpot. 1103 // 1104 1105 #ifndef PRODUCT 1106 #define EACH_NAMED_CON(template, requirement) \ 1107 template(java_lang_invoke_MemberName,MN_IS_METHOD) \ 1108 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \ 1109 template(java_lang_invoke_MemberName,MN_IS_FIELD) \ 1110 template(java_lang_invoke_MemberName,MN_IS_TYPE) \ 1111 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \ 1112 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \ 1113 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \ 1114 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \ 1115 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \ 1116 /*end*/ 1117 1118 #define IGNORE_REQ(req_expr) /* req_expr */ 1119 #define ONE_PLUS(scope,value) 1+ 1120 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0; 1121 #define VALUE_COMMA(scope,value) scope::value, 1122 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 }; 1123 #define STRING_NULL(scope,value) #value "\0" 1124 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) }; 1125 1126 static bool advertise_con_value(int which) { 1127 if (which < 0) return false; 1128 bool ok = true; 1129 int count = 0; 1130 #define INC_COUNT(scope,value) \ 1131 ++count; 1132 #define CHECK_REQ(req_expr) \ 1133 if (which < count) return ok; \ 1134 ok = (req_expr); 1135 EACH_NAMED_CON(INC_COUNT, CHECK_REQ); 1136 #undef INC_COUNT 1137 #undef CHECK_REQ 1138 assert(count == con_value_count, ""); 1139 if (which < count) return ok; 1140 return false; 1141 } 1142 1143 #undef ONE_PLUS 1144 #undef VALUE_COMMA 1145 #undef STRING_NULL 1146 #undef EACH_NAMED_CON 1147 #endif // PRODUCT 1148 1149 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { 1150 #ifndef PRODUCT 1151 if (advertise_con_value(which)) { 1152 assert(which >= 0 && which < con_value_count, ""); 1153 int con = con_values[which]; 1154 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh)); 1155 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { 1156 const char* str = &con_names[0]; 1157 for (int i = 0; i < which; i++) 1158 str += strlen(str) + 1; // skip name and null 1159 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint 1160 box->obj_at_put(0, name); 1161 } 1162 return con; 1163 } 1164 #endif 1165 return 0; 1166 } 1167 JVM_END 1168 1169 // void init(MemberName self, AccessibleObject ref) 1170 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { 1171 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1172 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); } 1173 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1174 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); 1175 MethodHandles::init_MemberName(mname, target, CHECK); 1176 } 1177 JVM_END 1178 1179 // void expand(MemberName self) 1180 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1181 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1182 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1183 MethodHandles::expand_MemberName(mname, 0, CHECK); 1184 } 1185 JVM_END 1186 1187 // void resolve(MemberName self, Class<?> caller) 1188 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { 1189 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); } 1190 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1191 1192 // The trusted Java code that calls this method should already have performed 1193 // access checks on behalf of the given caller. But, we can verify this. 1194 if (VerifyMethodHandles && caller_jh != NULL && 1195 java_lang_invoke_MemberName::clazz(mname()) != NULL) { 1196 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname())); 1197 if (reference_klass != NULL && reference_klass->is_objArray_klass()) { 1198 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass(); 1199 } 1200 1201 // Reflection::verify_class_access can only handle instance classes. 1202 if (reference_klass != NULL && reference_klass->is_instance_klass()) { 1203 // Emulate LinkResolver::check_klass_accessability. 1204 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1205 if (caller != SystemDictionary::Object_klass() 1206 && Reflection::verify_class_access(caller, 1207 InstanceKlass::cast(reference_klass), 1208 true) != Reflection::ACCESS_OK) { 1209 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name()); 1210 } 1211 } 1212 } 1213 1214 Klass* caller = caller_jh == NULL ? NULL : 1215 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1216 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL); 1217 1218 if (resolved.is_null()) { 1219 int flags = java_lang_invoke_MemberName::flags(mname()); 1220 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 1221 if (!MethodHandles::ref_kind_is_valid(ref_kind)) { 1222 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format"); 1223 } 1224 if ((flags & ALL_KINDS) == IS_FIELD) { 1225 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed"); 1226 } else if ((flags & ALL_KINDS) == IS_METHOD || 1227 (flags & ALL_KINDS) == IS_CONSTRUCTOR) { 1228 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed"); 1229 } else { 1230 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed"); 1231 } 1232 } 1233 1234 return JNIHandles::make_local(THREAD, resolved()); 1235 } 1236 JVM_END 1237 1238 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) { 1239 if (mname == NULL || 1240 java_lang_invoke_MemberName::clazz(mname) == NULL) { 1241 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved"); 1242 } else { 1243 int flags = java_lang_invoke_MemberName::flags(mname); 1244 if ((flags & IS_FIELD) != 0 && 1245 (must_be_static 1246 ? (flags & JVM_ACC_STATIC) != 0 1247 : (flags & JVM_ACC_STATIC) == 0)) { 1248 int vmindex = java_lang_invoke_MemberName::vmindex(mname); 1249 return (jlong) vmindex; 1250 } 1251 } 1252 const char* msg = (must_be_static ? "static field required" : "non-static field required"); 1253 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg); 1254 return 0; 1255 } 1256 1257 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1258 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD); 1259 } 1260 JVM_END 1261 1262 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1263 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD); 1264 } 1265 JVM_END 1266 1267 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1268 // use the other function to perform sanity checks: 1269 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL); 1270 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh)); 1271 return JNIHandles::make_local(THREAD, clazz); 1272 } 1273 JVM_END 1274 1275 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1276 if (mname_jh == NULL) return NULL; 1277 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1278 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()); 1279 objArrayHandle result = oopFactory::new_objArray_handle(SystemDictionary::Object_klass(), 2, CHECK_NULL); 1280 jvalue vmindex_value; vmindex_value.j = (long)vmindex; 1281 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL); 1282 result->obj_at_put(0, x); 1283 1284 int flags = java_lang_invoke_MemberName::flags(mname()); 1285 if ((flags & IS_FIELD) != 0) { 1286 x = java_lang_invoke_MemberName::clazz(mname()); 1287 } else { 1288 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 1289 assert(vmtarget != NULL && vmtarget->is_method(), "vmtarget is only method"); 1290 x = mname(); 1291 } 1292 result->obj_at_put(1, x); 1293 return JNIHandles::make_local(env, result()); 1294 } 1295 JVM_END 1296 1297 1298 1299 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1300 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1301 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls, 1302 jclass clazz_jh, jstring name_jh, jstring sig_jh, 1303 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { 1304 if (clazz_jh == NULL || results_jh == NULL) return -1; 1305 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)); 1306 1307 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh)); 1308 if (results.is_null() || !results->is_objArray()) return -1; 1309 1310 TempNewSymbol name = NULL; 1311 TempNewSymbol sig = NULL; 1312 if (name_jh != NULL) { 1313 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); 1314 if (name == NULL) return 0; // a match is not possible 1315 } 1316 if (sig_jh != NULL) { 1317 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); 1318 if (sig == NULL) return 0; // a match is not possible 1319 } 1320 1321 Klass* caller = NULL; 1322 if (caller_jh != NULL) { 1323 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); 1324 if (!java_lang_Class::is_instance(caller_oop)) return -1; 1325 caller = java_lang_Class::as_Klass(caller_oop); 1326 } 1327 1328 if (name != NULL && sig != NULL && results.not_null()) { 1329 // try a direct resolve 1330 // %%% TO DO 1331 } 1332 1333 int res = MethodHandles::find_MemberNames(k, name, sig, mflags, 1334 caller, skip, results, CHECK_0); 1335 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks 1336 return res; 1337 } 1338 JVM_END 1339 1340 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1341 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1342 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1343 { 1344 // Walk all nmethods depending on this call site. 1345 MutexLocker mu(Compile_lock, thread); 1346 MethodHandles::flush_dependent_nmethods(call_site, target); 1347 java_lang_invoke_CallSite::set_target(call_site(), target()); 1348 } 1349 } 1350 JVM_END 1351 1352 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1353 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1354 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1355 { 1356 // Walk all nmethods depending on this call site. 1357 MutexLocker mu(Compile_lock, thread); 1358 MethodHandles::flush_dependent_nmethods(call_site, target); 1359 java_lang_invoke_CallSite::set_target_volatile(call_site(), target()); 1360 } 1361 } 1362 JVM_END 1363 1364 JVM_ENTRY(void, MHN_copyOutBootstrapArguments(JNIEnv* env, jobject igcls, 1365 jobject caller_jh, jintArray index_info_jh, 1366 jint start, jint end, 1367 jobjectArray buf_jh, jint pos, 1368 jboolean resolve, jobject ifna_jh)) { 1369 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller_jh)); 1370 if (caller_k == NULL || !caller_k->is_instance_klass()) { 1371 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad caller"); 1372 } 1373 InstanceKlass* caller = InstanceKlass::cast(caller_k); 1374 typeArrayOop index_info_oop = (typeArrayOop) JNIHandles::resolve(index_info_jh); 1375 if (index_info_oop == NULL || 1376 index_info_oop->klass() != Universe::intArrayKlassObj() || 1377 typeArrayOop(index_info_oop)->length() < 2) { 1378 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (0)"); 1379 } 1380 typeArrayHandle index_info(THREAD, index_info_oop); 1381 int bss_index_in_pool = index_info->int_at(1); 1382 // While we are here, take a quick look at the index info: 1383 if (bss_index_in_pool <= 0 || 1384 bss_index_in_pool >= caller->constants()->length() || 1385 index_info->int_at(0) 1386 != caller->constants()->invoke_dynamic_argument_count_at(bss_index_in_pool)) { 1387 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (1)"); 1388 } 1389 objArrayHandle buf(THREAD, (objArrayOop) JNIHandles::resolve(buf_jh)); 1390 if (start < 0) { 1391 for (int pseudo_index = -4; pseudo_index < 0; pseudo_index++) { 1392 if (start == pseudo_index) { 1393 if (start >= end || 0 > pos || pos >= buf->length()) break; 1394 oop pseudo_arg = NULL; 1395 switch (pseudo_index) { 1396 case -4: // bootstrap method 1397 { 1398 int bsm_index = caller->constants()->invoke_dynamic_bootstrap_method_ref_index_at(bss_index_in_pool); 1399 pseudo_arg = caller->constants()->resolve_possibly_cached_constant_at(bsm_index, CHECK); 1400 break; 1401 } 1402 case -3: // name 1403 { 1404 Symbol* name = caller->constants()->name_ref_at(bss_index_in_pool); 1405 Handle str = java_lang_String::create_from_symbol(name, CHECK); 1406 pseudo_arg = str(); 1407 break; 1408 } 1409 case -2: // type 1410 { 1411 Symbol* type = caller->constants()->signature_ref_at(bss_index_in_pool); 1412 Handle th; 1413 if (type->byte_at(0) == '(') { 1414 th = SystemDictionary::find_method_handle_type(type, caller, CHECK); 1415 } else { 1416 th = SystemDictionary::find_java_mirror_for_type(type, caller, SignatureStream::NCDFError, CHECK); 1417 } 1418 pseudo_arg = th(); 1419 break; 1420 } 1421 case -1: // argument count 1422 { 1423 int argc = caller->constants()->invoke_dynamic_argument_count_at(bss_index_in_pool); 1424 jvalue argc_value; argc_value.i = (jint)argc; 1425 pseudo_arg = java_lang_boxing_object::create(T_INT, &argc_value, CHECK); 1426 break; 1427 } 1428 } 1429 1430 // Store the pseudo-argument, and advance the pointers. 1431 buf->obj_at_put(pos++, pseudo_arg); 1432 ++start; 1433 } 1434 } 1435 // When we are done with this there may be regular arguments to process too. 1436 } 1437 Handle ifna(THREAD, JNIHandles::resolve(ifna_jh)); 1438 caller->constants()-> 1439 copy_bootstrap_arguments_at(bss_index_in_pool, 1440 start, end, buf, pos, 1441 (resolve == JNI_TRUE), ifna, CHECK); 1442 } 1443 JVM_END 1444 1445 // It is called by a Cleaner object which ensures that dropped CallSites properly 1446 // deallocate their dependency information. 1447 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) { 1448 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh)); 1449 { 1450 // Walk all nmethods depending on this call site. 1451 MutexLocker mu1(Compile_lock, thread); 1452 1453 int marked = 0; 1454 { 1455 NoSafepointVerifier nsv; 1456 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1457 assert(safe_to_expunge(), "removal is not safe"); 1458 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context()); 1459 marked = deps.remove_all_dependents(); 1460 } 1461 if (marked > 0) { 1462 // At least one nmethod has been marked for deoptimization 1463 VM_Deoptimize op; 1464 VMThread::execute(&op); 1465 } 1466 } 1467 } 1468 JVM_END 1469 1470 /** 1471 * Throws a java/lang/UnsupportedOperationException unconditionally. 1472 * This is required by the specification of MethodHandle.invoke if 1473 * invoked directly. 1474 */ 1475 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1476 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively"); 1477 return NULL; 1478 } 1479 JVM_END 1480 1481 /** 1482 * Throws a java/lang/UnsupportedOperationException unconditionally. 1483 * This is required by the specification of MethodHandle.invokeExact if 1484 * invoked directly. 1485 */ 1486 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1487 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively"); 1488 return NULL; 1489 } 1490 JVM_END 1491 1492 /// JVM_RegisterMethodHandleMethods 1493 1494 #undef CS // Solaris builds complain 1495 1496 #define LANG "Ljava/lang/" 1497 #define JLINV "Ljava/lang/invoke/" 1498 1499 #define OBJ LANG "Object;" 1500 #define CLS LANG "Class;" 1501 #define STRG LANG "String;" 1502 #define CS JLINV "CallSite;" 1503 #define MT JLINV "MethodType;" 1504 #define MH JLINV "MethodHandle;" 1505 #define MEM JLINV "MemberName;" 1506 #define CTX JLINV "MethodHandleNatives$CallSiteContext;" 1507 1508 #define CC (char*) /*cast a literal from (const char*)*/ 1509 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1510 1511 // These are the native methods on java.lang.invoke.MethodHandleNatives. 1512 static JNINativeMethod MHN_methods[] = { 1513 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)}, 1514 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)}, 1515 {CC "resolve", CC "(" MEM "" CLS ")" MEM, FN_PTR(MHN_resolve_Mem)}, 1516 // static native int getNamedCon(int which, Object[] name) 1517 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)}, 1518 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1519 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1520 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)}, 1521 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)}, 1522 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)}, 1523 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)}, 1524 {CC "copyOutBootstrapArguments", CC "(" CLS "[III[" OBJ "IZ" OBJ ")V", FN_PTR(MHN_copyOutBootstrapArguments)}, 1525 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)}, 1526 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)}, 1527 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)}, 1528 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)} 1529 }; 1530 1531 static JNINativeMethod MH_methods[] = { 1532 // UnsupportedOperationException throwers 1533 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)}, 1534 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)} 1535 }; 1536 1537 /** 1538 * This one function is exported, used by NativeLookup. 1539 */ 1540 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { 1541 assert(!MethodHandles::enabled(), "must not be enabled"); 1542 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present"); 1543 1544 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror(); 1545 jclass MH_class = (jclass) JNIHandles::make_local(env, mirror); 1546 1547 { 1548 ThreadToNativeFromVM ttnfv(thread); 1549 1550 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod)); 1551 guarantee(status == JNI_OK && !env->ExceptionOccurred(), 1552 "register java.lang.invoke.MethodHandleNative natives"); 1553 1554 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod)); 1555 guarantee(status == JNI_OK && !env->ExceptionOccurred(), 1556 "register java.lang.invoke.MethodHandle natives"); 1557 } 1558 1559 if (TraceInvokeDynamic) { 1560 tty->print_cr("MethodHandle support loaded (using LambdaForms)"); 1561 } 1562 1563 MethodHandles::set_enabled(true); 1564 } 1565 JVM_END