1 /* 2 * Copyright (c) 2008, 2019, 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/fieldDescriptor.inline.hpp" 43 #include "runtime/handles.inline.hpp" 44 #include "runtime/interfaceSupport.inline.hpp" 45 #include "runtime/javaCalls.hpp" 46 #include "runtime/jniHandles.inline.hpp" 47 #include "runtime/timerTrace.hpp" 48 #include "runtime/reflection.hpp" 49 #include "runtime/safepointVerifiers.hpp" 50 #include "runtime/signature.hpp" 51 #include "runtime/stubRoutines.hpp" 52 #include "utilities/exceptions.hpp" 53 54 55 /* 56 * JSR 292 reference implementation: method handles 57 * The JDK 7 reference implementation represented method handle 58 * combinations as chains. Each link in the chain had a "vmentry" 59 * field which pointed at a bit of assembly code which performed 60 * one transformation before dispatching to the next link in the chain. 61 * 62 * The current reference implementation pushes almost all code generation 63 * responsibility to (trusted) Java code. A method handle contains a 64 * pointer to its "LambdaForm", which embodies all details of the method 65 * handle's behavior. The LambdaForm is a normal Java object, managed 66 * by a runtime coded in Java. 67 */ 68 69 bool MethodHandles::_enabled = false; // set true after successful native linkage 70 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL; 71 72 /** 73 * Generates method handle adapters. Returns 'false' if memory allocation 74 * failed and true otherwise. 75 */ 76 void MethodHandles::generate_adapters() { 77 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present"); 78 assert(_adapter_code == NULL, "generate only once"); 79 80 ResourceMark rm; 81 TraceTime timer("MethodHandles adapters generation", TRACETIME_LOG(Info, startuptime)); 82 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size); 83 CodeBuffer code(_adapter_code); 84 MethodHandlesAdapterGenerator g(&code); 85 g.generate(); 86 code.log_section_sizes("MethodHandlesAdapterBlob"); 87 } 88 89 //------------------------------------------------------------------------------ 90 // MethodHandlesAdapterGenerator::generate 91 // 92 void MethodHandlesAdapterGenerator::generate() { 93 // Generate generic method handle adapters. 94 // Generate interpreter entries 95 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST; 96 mk <= Interpreter::method_handle_invoke_LAST; 97 mk = Interpreter::MethodKind(1 + (int)mk)) { 98 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk); 99 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid)); 100 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid); 101 if (entry != NULL) { 102 Interpreter::set_entry_for_kind(mk, entry); 103 } 104 // If the entry is not set, it will throw AbstractMethodError. 105 } 106 } 107 108 void MethodHandles::set_enabled(bool z) { 109 if (_enabled != z) { 110 guarantee(z, "can only enable once"); 111 _enabled = z; 112 } 113 } 114 115 // MemberName support 116 117 // import java_lang_invoke_MemberName.* 118 enum { 119 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD, 120 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR, 121 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD, 122 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE, 123 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE, 124 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, 125 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, 126 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES, 127 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES, 128 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE 129 }; 130 131 int MethodHandles::ref_kind_to_flags(int ref_kind) { 132 assert(ref_kind_is_valid(ref_kind), "%d", ref_kind); 133 int flags = (ref_kind << REFERENCE_KIND_SHIFT); 134 if (ref_kind_is_field(ref_kind)) { 135 flags |= IS_FIELD; 136 } else if (ref_kind_is_method(ref_kind)) { 137 flags |= IS_METHOD; 138 } else if (ref_kind == JVM_REF_newInvokeSpecial) { 139 flags |= IS_CONSTRUCTOR; 140 } 141 return flags; 142 } 143 144 Handle MethodHandles::resolve_MemberName_type(Handle mname, Klass* caller, TRAPS) { 145 Handle empty; 146 Handle type(THREAD, java_lang_invoke_MemberName::type(mname())); 147 if (!java_lang_String::is_instance_inlined(type())) { 148 return type; // already resolved 149 } 150 Symbol* signature = java_lang_String::as_symbol_or_null(type()); 151 if (signature == NULL) { 152 return empty; // no such signature exists in the VM 153 } 154 Handle resolved; 155 int flags = java_lang_invoke_MemberName::flags(mname()); 156 switch (flags & ALL_KINDS) { 157 case IS_METHOD: 158 case IS_CONSTRUCTOR: 159 resolved = SystemDictionary::find_method_handle_type(signature, caller, CHECK_(empty)); 160 break; 161 case IS_FIELD: 162 resolved = SystemDictionary::find_field_handle_type(signature, caller, CHECK_(empty)); 163 break; 164 default: 165 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 166 } 167 if (resolved.is_null()) { 168 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MemberName type", empty); 169 } 170 return resolved; 171 } 172 173 oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) { 174 // This method is used from java.lang.invoke.MemberName constructors. 175 // It fills in the new MemberName from a java.lang.reflect.Member. 176 Thread* thread = Thread::current(); 177 oop target_oop = target(); 178 Klass* target_klass = target_oop->klass(); 179 if (target_klass == SystemDictionary::reflect_Field_klass()) { 180 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() 181 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() 182 Klass* k = java_lang_Class::as_Klass(clazz); 183 if (k != NULL && k->is_instance_klass()) { 184 fieldDescriptor fd(InstanceKlass::cast(k), slot); 185 oop mname2 = init_field_MemberName(mname, fd); 186 if (mname2 != NULL) { 187 // Since we have the reified name and type handy, add them to the result. 188 if (java_lang_invoke_MemberName::name(mname2) == NULL) 189 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop)); 190 if (java_lang_invoke_MemberName::type(mname2) == NULL) 191 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop)); 192 } 193 return mname2; 194 } 195 } else if (target_klass == SystemDictionary::reflect_Method_klass()) { 196 oop clazz = java_lang_reflect_Method::clazz(target_oop); 197 int slot = java_lang_reflect_Method::slot(target_oop); 198 Klass* k = java_lang_Class::as_Klass(clazz); 199 if (k != NULL && k->is_instance_klass()) { 200 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 201 if (m == NULL || is_signature_polymorphic(m->intrinsic_id())) 202 return NULL; // do not resolve unless there is a concrete signature 203 CallInfo info(m, k, CHECK_NULL); 204 return init_method_MemberName(mname, info); 205 } 206 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) { 207 oop clazz = java_lang_reflect_Constructor::clazz(target_oop); 208 int slot = java_lang_reflect_Constructor::slot(target_oop); 209 Klass* k = java_lang_Class::as_Klass(clazz); 210 if (k != NULL && k->is_instance_klass()) { 211 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 212 if (m == NULL) return NULL; 213 CallInfo info(m, k, CHECK_NULL); 214 return init_method_MemberName(mname, info); 215 } 216 } 217 return NULL; 218 } 219 220 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) { 221 assert(info.resolved_appendix().is_null(), "only normal methods here"); 222 methodHandle m = info.resolved_method(); 223 assert(m.not_null(), "null method handle"); 224 InstanceKlass* m_klass = m->method_holder(); 225 assert(m_klass != NULL, "null holder for method handle"); 226 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ); 227 int vmindex = Method::invalid_vtable_index; 228 229 switch (info.call_kind()) { 230 case CallInfo::itable_call: 231 vmindex = info.itable_index(); 232 // More importantly, the itable index only works with the method holder. 233 assert(m_klass->verify_itable_index(vmindex), ""); 234 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT); 235 if (TraceInvokeDynamic) { 236 ttyLocker ttyl; 237 ResourceMark rm; 238 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:", 239 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 240 vmindex); 241 m->access_flags().print_on(tty); 242 if (!m->is_abstract()) { 243 if (!m->is_private()) { 244 tty->print("default"); 245 } 246 else { 247 tty->print("private-intf"); 248 } 249 } 250 tty->cr(); 251 } 252 break; 253 254 case CallInfo::vtable_call: 255 vmindex = info.vtable_index(); 256 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT); 257 assert(info.resolved_klass()->is_subtype_of(m_klass), "virtual call must be type-safe"); 258 if (m_klass->is_interface()) { 259 // This is a vtable call to an interface method (abstract "miranda method" or default method). 260 // The vtable index is meaningless without a class (not interface) receiver type, so get one. 261 // (LinkResolver should help us figure this out.) 262 assert(info.resolved_klass()->is_instance_klass(), "subtype of interface must be an instance klass"); 263 InstanceKlass* m_klass_non_interface = InstanceKlass::cast(info.resolved_klass()); 264 if (m_klass_non_interface->is_interface()) { 265 m_klass_non_interface = SystemDictionary::Object_klass(); 266 #ifdef ASSERT 267 { ResourceMark rm; 268 Method* m2 = m_klass_non_interface->vtable().method_at(vmindex); 269 assert(m->name() == m2->name() && m->signature() == m2->signature(), 270 "at %d, %s != %s", vmindex, 271 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()); 272 } 273 #endif //ASSERT 274 } 275 if (!m->is_public()) { 276 assert(m->is_public(), "virtual call must be to public interface method"); 277 return NULL; // elicit an error later in product build 278 } 279 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface), "virtual call must be type-safe"); 280 m_klass = m_klass_non_interface; 281 } 282 if (TraceInvokeDynamic) { 283 ttyLocker ttyl; 284 ResourceMark rm; 285 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:", 286 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 287 m_klass->internal_name(), vmindex); 288 m->access_flags().print_on(tty); 289 if (m->is_default_method()) { 290 tty->print("default"); 291 } 292 tty->cr(); 293 } 294 break; 295 296 case CallInfo::direct_call: 297 vmindex = Method::nonvirtual_vtable_index; 298 if (m->is_static()) { 299 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT); 300 } else if (m->is_initializer()) { 301 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 302 } else { 303 // "special" reflects that this is a direct call, not that it 304 // necessarily originates from an invokespecial. We can also do 305 // direct calls for private and/or final non-static methods. 306 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 307 } 308 break; 309 310 default: assert(false, "bad CallInfo"); return NULL; 311 } 312 313 // @CallerSensitive annotation detected 314 if (m->caller_sensitive()) { 315 flags |= CALLER_SENSITIVE; 316 } 317 318 Handle resolved_method = info.resolved_method_name(); 319 assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m() || m->is_old(), 320 "Should not change after link resolution"); 321 322 oop mname_oop = mname(); 323 java_lang_invoke_MemberName::set_flags (mname_oop, flags); 324 java_lang_invoke_MemberName::set_method (mname_oop, resolved_method()); 325 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index 326 java_lang_invoke_MemberName::set_clazz (mname_oop, m_klass->java_mirror()); 327 // Note: name and type can be lazily computed by resolve_MemberName, 328 // if Java code needs them as resolved String and MethodType objects. 329 // If relevant, the vtable or itable value is stored as vmindex. 330 // This is done eagerly, since it is readily available without 331 // constructing any new objects. 332 return mname(); 333 } 334 335 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) { 336 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ); 337 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT); 338 if (fd.is_flattenable()) { 339 flags |= JVM_ACC_FLATTENABLE; 340 } 341 if (fd.is_flattened()) { 342 flags |= JVM_ACC_FIELD_FLATTENED; 343 } 344 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT); 345 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit 346 347 oop mname_oop = mname(); 348 java_lang_invoke_MemberName::set_flags (mname_oop, flags); 349 java_lang_invoke_MemberName::set_method (mname_oop, NULL); 350 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); 351 java_lang_invoke_MemberName::set_clazz (mname_oop, fd.field_holder()->java_mirror()); 352 353 oop type = field_signature_type_or_null(fd.signature()); 354 oop name = field_name_or_null(fd.name()); 355 if (name != NULL) 356 java_lang_invoke_MemberName::set_name(mname_oop, name); 357 if (type != NULL) 358 java_lang_invoke_MemberName::set_type(mname_oop, type); 359 // Note: name and type can be lazily computed by resolve_MemberName, 360 // if Java code needs them as resolved String and Class objects. 361 // Note that the incoming type oop might be pre-resolved (non-null). 362 // The base clazz and field offset (vmindex) must be eagerly stored, 363 // because they unambiguously identify the field. 364 // Although the fieldDescriptor::_index would also identify the field, 365 // we do not use it, because it is harder to decode. 366 // TO DO: maybe intern mname_oop 367 return mname(); 368 } 369 370 // JVM 2.9 Special Methods: 371 // A method is signature polymorphic if and only if all of the following conditions hold : 372 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes. 373 // * It has a single formal parameter of type Object[]. 374 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type. 375 // * It has the ACC_VARARGS and ACC_NATIVE flags set. 376 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) { 377 if (klass == NULL) 378 return false; 379 // The following test will fail spuriously during bootstrap of MethodHandle itself: 380 // if (klass != SystemDictionary::MethodHandle_klass()) 381 // Test the name instead: 382 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() && 383 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) { 384 return false; 385 } 386 387 // Look up signature polymorphic method with polymorphic return type 388 Symbol* poly_sig = vmSymbols::object_array_object_signature(); 389 InstanceKlass* iklass = InstanceKlass::cast(klass); 390 Method* m = iklass->find_method(name, poly_sig); 391 if (m != NULL) { 392 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 393 int flags = m->access_flags().as_int(); 394 if ((flags & required) == required) { 395 return true; 396 } 397 } 398 399 // Look up signature polymorphic method with non-polymorphic (non Object) return type 400 int me; 401 int ms = iklass->find_method_by_name(name, &me); 402 if (ms == -1) return false; 403 for (; ms < me; ms++) { 404 Method* m = iklass->methods()->at(ms); 405 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 406 int flags = m->access_flags().as_int(); 407 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) { 408 return true; 409 } 410 } 411 return false; 412 } 413 414 415 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) { 416 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid)); 417 switch (iid) { 418 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name(); 419 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name(); 420 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name(); 421 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name(); 422 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name(); 423 default: 424 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid)); 425 return 0; 426 } 427 } 428 429 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) { 430 switch(id) { 431 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual; 432 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface; 433 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic; 434 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial; 435 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle; 436 default: 437 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id)); 438 return Bytecodes::_illegal; 439 } 440 } 441 442 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) { 443 switch (iid) { 444 case vmIntrinsics::_invokeBasic: return 0; 445 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual; 446 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic; 447 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial; 448 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface; 449 default: 450 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid)); 451 return 0; 452 } 453 } 454 455 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) { 456 vmSymbols::SID name_id = vmSymbols::find_sid(name); 457 switch (name_id) { 458 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins. 459 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric; 460 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic: 461 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic; 462 463 // There is one static signature-polymorphic method for each JVM invocation mode. 464 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual; 465 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic; 466 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial; 467 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface; 468 default: break; 469 } 470 471 // Cover the case of invokeExact and any future variants of invokeFoo. 472 Klass* mh_klass = SystemDictionary::well_known_klass( 473 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) ); 474 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) { 475 return vmIntrinsics::_invokeGeneric; 476 } 477 478 // Cover the case of methods on VarHandle. 479 Klass* vh_klass = SystemDictionary::well_known_klass( 480 SystemDictionary::WK_KLASS_ENUM_NAME(VarHandle_klass) ); 481 if (vh_klass != NULL && is_method_handle_invoke_name(vh_klass, name)) { 482 return vmIntrinsics::_invokeGeneric; 483 } 484 485 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against. 486 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic. 487 return vmIntrinsics::_none; 488 } 489 490 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) { 491 if (klass != NULL && 492 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() || 493 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) { 494 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 495 if (iid != vmIntrinsics::_none) 496 return iid; 497 if (is_method_handle_invoke_name(klass, name)) 498 return vmIntrinsics::_invokeGeneric; 499 } 500 return vmIntrinsics::_none; 501 } 502 503 // Returns true if method is signature polymorphic and public 504 bool MethodHandles::is_signature_polymorphic_public_name(Klass* klass, Symbol* name) { 505 if (is_signature_polymorphic_name(klass, name)) { 506 InstanceKlass* iklass = InstanceKlass::cast(klass); 507 int me; 508 int ms = iklass->find_method_by_name(name, &me); 509 assert(ms != -1, ""); 510 for (; ms < me; ms++) { 511 Method* m = iklass->methods()->at(ms); 512 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS | JVM_ACC_PUBLIC; 513 int flags = m->access_flags().as_int(); 514 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) { 515 return true; 516 } 517 } 518 } 519 return false; 520 } 521 522 // convert the external string or reflective type to an internal signature 523 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) { 524 if (java_lang_invoke_MethodType::is_instance(type_str)) { 525 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD); 526 } else if (java_lang_Class::is_instance(type_str)) { 527 return java_lang_Class::as_signature(type_str, false, THREAD); 528 } else if (java_lang_String::is_instance_inlined(type_str)) { 529 if (intern_if_not_found) { 530 return java_lang_String::as_symbol(type_str, THREAD); 531 } else { 532 return java_lang_String::as_symbol_or_null(type_str); 533 } 534 } else { 535 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL); 536 } 537 } 538 539 static const char OBJ_SIG[] = "Ljava/lang/Object;"; 540 enum { OBJ_SIG_LEN = 18 }; 541 542 bool MethodHandles::is_basic_type_signature(Symbol* sig) { 543 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, ""); 544 assert(vmSymbols::object_signature()->equals(OBJ_SIG), ""); 545 const int len = sig->utf8_length(); 546 for (int i = 0; i < len; i++) { 547 switch (sig->char_at(i)) { 548 case 'L': 549 // only java/lang/Object is valid here 550 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i) 551 return false; 552 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop 553 continue; 554 case '(': case ')': case 'V': 555 case 'I': case 'J': case 'F': case 'D': 556 continue; 557 //case '[': 558 //case 'Z': case 'B': case 'C': case 'S': 559 default: 560 return false; 561 } 562 } 563 return true; 564 } 565 566 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) { 567 Symbol* bsig = NULL; 568 if (sig == NULL) { 569 return sig; 570 } else if (is_basic_type_signature(sig)) { 571 sig->increment_refcount(); 572 return sig; // that was easy 573 } else if (sig->char_at(0) != '(') { 574 BasicType bt = char2type(sig->char_at(0)); 575 if (is_subword_type(bt)) { 576 bsig = vmSymbols::int_signature(); 577 } else { 578 assert(bt == T_OBJECT || bt == T_ARRAY || bt == T_VALUETYPE, "is_basic_type_signature was false"); 579 bsig = vmSymbols::object_signature(); 580 } 581 } else { 582 ResourceMark rm; 583 stringStream buffer(128); 584 buffer.put('('); 585 int arg_pos = 0, keep_arg_pos = -1; 586 if (keep_last_arg) 587 keep_arg_pos = ArgumentCount(sig).size() - 1; 588 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) { 589 BasicType bt = ss.type(); 590 size_t this_arg_pos = buffer.size(); 591 if (ss.at_return_type()) { 592 buffer.put(')'); 593 } 594 if (arg_pos == keep_arg_pos) { 595 buffer.write((char*) ss.raw_bytes(), 596 (int) ss.raw_length()); 597 } else if (bt == T_OBJECT || bt == T_ARRAY || bt == T_VALUETYPE) { 598 buffer.write(OBJ_SIG, OBJ_SIG_LEN); 599 } else { 600 if (is_subword_type(bt)) 601 bt = T_INT; 602 buffer.put(type2char(bt)); 603 } 604 arg_pos++; 605 } 606 const char* sigstr = buffer.base(); 607 int siglen = (int) buffer.size(); 608 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD); 609 } 610 assert(is_basic_type_signature(bsig) || 611 // detune assert in case the injected argument is not a basic type: 612 keep_last_arg, ""); 613 return bsig; 614 } 615 616 void MethodHandles::print_as_basic_type_signature_on(outputStream* st, 617 Symbol* sig, 618 bool keep_arrays, 619 bool keep_basic_names) { 620 st = st ? st : tty; 621 int len = sig->utf8_length(); 622 int array = 0; 623 bool prev_type = false; 624 for (int i = 0; i < len; i++) { 625 char ch = sig->char_at(i); 626 switch (ch) { 627 case '(': case ')': 628 prev_type = false; 629 st->put(ch); 630 continue; 631 case '[': 632 if (!keep_basic_names && keep_arrays) 633 st->put(ch); 634 array++; 635 continue; 636 case 'L': 637 { 638 if (prev_type) st->put(','); 639 int start = i+1, slash = start; 640 while (++i < len && (ch = sig->char_at(i)) != ';') { 641 if (ch == '/' || ch == '.' || ch == '$') slash = i+1; 642 } 643 if (slash < i) start = slash; 644 if (!keep_basic_names) { 645 st->put('L'); 646 } else { 647 for (int j = start; j < i; j++) 648 st->put(sig->char_at(j)); 649 prev_type = true; 650 } 651 break; 652 } 653 default: 654 { 655 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) { 656 ch = '['; 657 array = 0; 658 } 659 if (prev_type) st->put(','); 660 const char* n = NULL; 661 if (keep_basic_names) 662 n = type2name(char2type(ch)); 663 if (n == NULL) { 664 // unknown letter, or we don't want to know its name 665 st->put(ch); 666 } else { 667 st->print("%s", n); 668 prev_type = true; 669 } 670 break; 671 } 672 } 673 // Switch break goes here to take care of array suffix: 674 if (prev_type) { 675 while (array > 0) { 676 st->print("[]"); 677 --array; 678 } 679 } 680 array = 0; 681 } 682 } 683 684 685 686 static oop object_java_mirror() { 687 return SystemDictionary::Object_klass()->java_mirror(); 688 } 689 690 oop MethodHandles::field_name_or_null(Symbol* s) { 691 if (s == NULL) return NULL; 692 return StringTable::lookup(s); 693 } 694 695 oop MethodHandles::field_signature_type_or_null(Symbol* s) { 696 if (s == NULL) return NULL; 697 BasicType bt = FieldType::basic_type(s); 698 if (is_java_primitive(bt)) { 699 assert(s->utf8_length() == 1, ""); 700 return java_lang_Class::primitive_mirror(bt); 701 } 702 // Here are some more short cuts for common types. 703 // They are optional, since reference types can be resolved lazily. 704 if (bt == T_OBJECT) { 705 if (s == vmSymbols::object_signature()) { 706 return object_java_mirror(); 707 } else if (s == vmSymbols::class_signature()) { 708 return SystemDictionary::Class_klass()->java_mirror(); 709 } else if (s == vmSymbols::string_signature()) { 710 return SystemDictionary::String_klass()->java_mirror(); 711 } 712 } 713 return NULL; 714 } 715 716 717 // An unresolved member name is a mere symbolic reference. 718 // Resolving it plants a vmtarget/vmindex in it, 719 // which refers directly to JVM internals. 720 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller, 721 bool speculative_resolve, TRAPS) { 722 Handle empty; 723 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 724 725 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) { 726 // Already resolved. 727 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname())); 728 assert(vmindex >= Method::nonvirtual_vtable_index, ""); 729 return mname; 730 } 731 732 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname())); 733 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname())); 734 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname())); 735 int flags = java_lang_invoke_MemberName::flags(mname()); 736 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 737 if (!ref_kind_is_valid(ref_kind)) { 738 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty); 739 } 740 741 DEBUG_ONLY(int old_vmindex); 742 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input"); 743 744 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) { 745 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty); 746 } 747 748 InstanceKlass* defc = NULL; 749 { 750 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop()); 751 if (defc_klass == NULL) return empty; // a primitive; no resolution possible 752 if (!defc_klass->is_instance_klass()) { 753 if (!defc_klass->is_array_klass()) return empty; 754 defc_klass = SystemDictionary::Object_klass(); 755 } 756 defc = InstanceKlass::cast(defc_klass); 757 } 758 if (defc == NULL) { 759 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty); 760 } 761 defc->link_class(CHECK_(empty)); // possible safepoint 762 763 // convert the external string name to an internal symbol 764 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str()); 765 if (name == NULL) return empty; // no such name 766 if (name == vmSymbols::class_initializer_name()) 767 return empty; // illegal name 768 769 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none; 770 if ((flags & ALL_KINDS) == IS_METHOD && 771 (defc == SystemDictionary::MethodHandle_klass() || defc == SystemDictionary::VarHandle_klass()) && 772 (ref_kind == JVM_REF_invokeVirtual || 773 ref_kind == JVM_REF_invokeSpecial || 774 // static invocation mode is required for _linkToVirtual, etc.: 775 ref_kind == JVM_REF_invokeStatic)) { 776 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 777 if (iid != vmIntrinsics::_none && 778 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) { 779 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic. 780 // For a static reference it could an internal linkage routine like _linkToVirtual, etc. 781 mh_invoke_id = iid; 782 } 783 } 784 785 // convert the external string or reflective type to an internal signature 786 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty)); 787 if (type == NULL) return empty; // no such signature exists in the VM 788 789 LinkInfo::AccessCheck access_check = caller != NULL ? 790 LinkInfo::needs_access_check : 791 LinkInfo::skip_access_check; 792 793 // Time to do the lookup. 794 switch (flags & ALL_KINDS) { 795 case IS_METHOD: 796 { 797 CallInfo result; 798 LinkInfo link_info(defc, name, type, caller, access_check); 799 { 800 assert(!HAS_PENDING_EXCEPTION, ""); 801 if (ref_kind == JVM_REF_invokeStatic) { 802 LinkResolver::resolve_static_call(result, 803 link_info, false, THREAD); 804 } else if (ref_kind == JVM_REF_invokeInterface) { 805 LinkResolver::resolve_interface_call(result, Handle(), defc, 806 link_info, false, THREAD); 807 } else if (mh_invoke_id != vmIntrinsics::_none) { 808 assert(!is_signature_polymorphic_static(mh_invoke_id), ""); 809 LinkResolver::resolve_handle_call(result, link_info, THREAD); 810 } else if (ref_kind == JVM_REF_invokeSpecial) { 811 LinkResolver::resolve_special_call(result, Handle(), 812 link_info, THREAD); 813 } else if (ref_kind == JVM_REF_invokeVirtual) { 814 LinkResolver::resolve_virtual_call(result, Handle(), defc, 815 link_info, false, THREAD); 816 } else { 817 assert(false, "ref_kind=%d", ref_kind); 818 } 819 if (HAS_PENDING_EXCEPTION) { 820 if (speculative_resolve) { 821 CLEAR_PENDING_EXCEPTION; 822 } 823 return empty; 824 } 825 } 826 if (result.resolved_appendix().not_null()) { 827 // The resolved MemberName must not be accompanied by an appendix argument, 828 // since there is no way to bind this value into the MemberName. 829 // Caller is responsible to prevent this from happening. 830 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty); 831 } 832 result.set_resolved_method_name(CHECK_(empty)); 833 oop mname2 = init_method_MemberName(mname, result); 834 return Handle(THREAD, mname2); 835 } 836 case IS_CONSTRUCTOR: 837 { 838 CallInfo result; 839 LinkInfo link_info(defc, name, type, caller, access_check); 840 { 841 assert(!HAS_PENDING_EXCEPTION, ""); 842 if (name == vmSymbols::object_initializer_name()) { 843 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD); 844 } else { 845 break; // will throw after end of switch 846 } 847 if (HAS_PENDING_EXCEPTION) { 848 if (speculative_resolve) { 849 CLEAR_PENDING_EXCEPTION; 850 } 851 return empty; 852 } 853 } 854 assert(result.is_statically_bound(), ""); 855 result.set_resolved_method_name(CHECK_(empty)); 856 oop mname2 = init_method_MemberName(mname, result); 857 return Handle(THREAD, mname2); 858 } 859 case IS_FIELD: 860 { 861 fieldDescriptor result; // find_field initializes fd if found 862 { 863 assert(!HAS_PENDING_EXCEPTION, ""); 864 LinkInfo link_info(defc, name, type, caller, LinkInfo::skip_access_check); 865 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD); 866 if (HAS_PENDING_EXCEPTION) { 867 if (speculative_resolve) { 868 CLEAR_PENDING_EXCEPTION; 869 } 870 return empty; 871 } 872 } 873 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind)); 874 return Handle(THREAD, mname2); 875 } 876 default: 877 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 878 } 879 880 return empty; 881 } 882 883 // Conversely, a member name which is only initialized from JVM internals 884 // may have null defc, name, and type fields. 885 // Resolving it plants a vmtarget/vmindex in it, 886 // which refers directly to JVM internals. 887 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { 888 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 889 890 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL); 891 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL); 892 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL); 893 int flags = java_lang_invoke_MemberName::flags(mname()); 894 895 if (suppress != 0) { 896 if (suppress & _suppress_defc) have_defc = true; 897 if (suppress & _suppress_name) have_name = true; 898 if (suppress & _suppress_type) have_type = true; 899 } 900 901 if (have_defc && have_name && have_type) return; // nothing needed 902 903 switch (flags & ALL_KINDS) { 904 case IS_METHOD: 905 case IS_CONSTRUCTOR: 906 { 907 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 908 if (vmtarget == NULL) { 909 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); 910 } 911 methodHandle m(THREAD, vmtarget); 912 DEBUG_ONLY(vmtarget = NULL); // safety 913 if (!have_defc) { 914 InstanceKlass* defc = m->method_holder(); 915 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 916 } 917 if (!have_name) { 918 //not java_lang_String::create_from_symbol; let's intern member names 919 oop name = StringTable::intern(m->name(), CHECK); 920 java_lang_invoke_MemberName::set_name(mname(), name); 921 } 922 if (!have_type) { 923 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); 924 java_lang_invoke_MemberName::set_type(mname(), type()); 925 } 926 return; 927 } 928 case IS_FIELD: 929 { 930 oop clazz = java_lang_invoke_MemberName::clazz(mname()); 931 if (clazz == NULL) { 932 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)"); 933 } 934 InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz)); 935 DEBUG_ONLY(clazz = NULL); // safety 936 int vmindex = java_lang_invoke_MemberName::vmindex(mname()); 937 bool is_static = ((flags & JVM_ACC_STATIC) != 0); 938 fieldDescriptor fd; // find_field initializes fd if found 939 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) 940 break; // cannot expand 941 if (!have_name) { 942 //not java_lang_String::create_from_symbol; let's intern member names 943 oop name = StringTable::intern(fd.name(), CHECK); 944 java_lang_invoke_MemberName::set_name(mname(), name); 945 } 946 if (!have_type) { 947 // If it is a primitive field type, don't mess with short strings like "I". 948 Handle type (THREAD, field_signature_type_or_null(fd.signature())); 949 if (type.is_null()) { 950 type = java_lang_String::create_from_symbol(fd.signature(), CHECK); 951 } 952 java_lang_invoke_MemberName::set_type(mname(), type()); 953 } 954 return; 955 } 956 } 957 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); 958 } 959 960 int MethodHandles::find_MemberNames(Klass* k, 961 Symbol* name, Symbol* sig, 962 int mflags, Klass* caller, 963 int skip, objArrayHandle results, TRAPS) { 964 // %%% take caller into account! 965 966 Thread* thread = Thread::current(); 967 968 if (k == NULL || !k->is_instance_klass()) return -1; 969 970 int rfill = 0, rlimit = results->length(), rskip = skip; 971 // overflow measurement: 972 int overflow = 0, overflow_limit = MAX2(1000, rlimit); 973 974 int match_flags = mflags; 975 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); 976 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); 977 bool local_only = !(search_superc | search_intfc); 978 979 if (name != NULL) { 980 if (name->utf8_length() == 0) return 0; // a match is not possible 981 } 982 if (sig != NULL) { 983 if (sig->utf8_length() == 0) return 0; // a match is not possible 984 if (sig->char_at(0) == '(') 985 match_flags &= ~(IS_FIELD | IS_TYPE); 986 else 987 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); 988 } 989 990 if ((match_flags & IS_TYPE) != 0) { 991 // NYI, and Core Reflection works quite well for this query 992 } 993 994 if ((match_flags & IS_FIELD) != 0) { 995 InstanceKlass* ik = InstanceKlass::cast(k); 996 for (FieldStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) { 997 if (name != NULL && st.name() != name) 998 continue; 999 if (sig != NULL && st.signature() != sig) 1000 continue; 1001 // passed the filters 1002 if (rskip > 0) { 1003 --rskip; 1004 } else if (rfill < rlimit) { 1005 Handle result(thread, results->obj_at(rfill++)); 1006 if (!java_lang_invoke_MemberName::is_instance(result())) 1007 return -99; // caller bug! 1008 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor()); 1009 if (!oopDesc::equals(saved, result())) 1010 results->obj_at_put(rfill-1, saved); // show saved instance to user 1011 } else if (++overflow >= overflow_limit) { 1012 match_flags = 0; break; // got tired of looking at overflow 1013 } 1014 } 1015 } 1016 1017 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { 1018 // watch out for these guys: 1019 Symbol* init_name = vmSymbols::object_initializer_name(); 1020 Symbol* clinit_name = vmSymbols::class_initializer_name(); 1021 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> 1022 bool negate_name_test = false; 1023 // fix name so that it captures the intention of IS_CONSTRUCTOR 1024 if (!(match_flags & IS_METHOD)) { 1025 // constructors only 1026 if (name == NULL) { 1027 name = init_name; 1028 } else if (name != init_name) { 1029 return 0; // no constructors of this method name 1030 } 1031 } else if (!(match_flags & IS_CONSTRUCTOR)) { 1032 // methods only 1033 if (name == NULL) { 1034 name = init_name; 1035 negate_name_test = true; // if we see the name, we *omit* the entry 1036 } else if (name == init_name) { 1037 return 0; // no methods of this constructor name 1038 } 1039 } else { 1040 // caller will accept either sort; no need to adjust name 1041 } 1042 InstanceKlass* ik = InstanceKlass::cast(k); 1043 for (MethodStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) { 1044 Method* m = st.method(); 1045 Symbol* m_name = m->name(); 1046 if (m_name == clinit_name) 1047 continue; 1048 if (name != NULL && ((m_name != name) ^ negate_name_test)) 1049 continue; 1050 if (sig != NULL && m->signature() != sig) 1051 continue; 1052 // passed the filters 1053 if (rskip > 0) { 1054 --rskip; 1055 } else if (rfill < rlimit) { 1056 Handle result(thread, results->obj_at(rfill++)); 1057 if (!java_lang_invoke_MemberName::is_instance(result())) 1058 return -99; // caller bug! 1059 CallInfo info(m, NULL, CHECK_0); 1060 oop saved = MethodHandles::init_method_MemberName(result, info); 1061 if (!oopDesc::equals(saved, result())) 1062 results->obj_at_put(rfill-1, saved); // show saved instance to user 1063 } else if (++overflow >= overflow_limit) { 1064 match_flags = 0; break; // got tired of looking at overflow 1065 } 1066 } 1067 } 1068 1069 // return number of elements we at leasted wanted to initialize 1070 return rfill + overflow; 1071 } 1072 1073 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) { 1074 assert_locked_or_safepoint(CodeCache_lock); 1075 1076 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site); 1077 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 1078 // Try to purge stale entries on updates. 1079 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects, 1080 // in order to avoid memory leak, stale entries are purged whenever a dependency list 1081 // is changed (both on addition and removal). Though memory reclamation is delayed, 1082 // it avoids indefinite memory usage growth. 1083 deps.add_dependent_nmethod(nm); 1084 } 1085 1086 void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) { 1087 assert_locked_or_safepoint(CodeCache_lock); 1088 1089 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site); 1090 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 1091 deps.remove_dependent_nmethod(nm); 1092 } 1093 1094 void MethodHandles::clean_dependency_context(oop call_site) { 1095 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site); 1096 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 1097 deps.clean_unloading_dependents(); 1098 } 1099 1100 void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) { 1101 assert_lock_strong(Compile_lock); 1102 1103 int marked = 0; 1104 CallSiteDepChange changes(call_site, target); 1105 { 1106 NoSafepointVerifier nsv; 1107 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1108 1109 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site()); 1110 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 1111 marked = deps.mark_dependent_nmethods(changes); 1112 } 1113 if (marked > 0) { 1114 // At least one nmethod has been marked for deoptimization. 1115 VM_Deoptimize op; 1116 VMThread::execute(&op); 1117 } 1118 } 1119 1120 void MethodHandles::trace_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid) { 1121 if (TraceMethodHandles) { 1122 const char* name = vmIntrinsics::name_at(iid); 1123 if (*name == '_') name += 1; 1124 const size_t len = strlen(name) + 50; 1125 char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal); 1126 const char* suffix = ""; 1127 if (is_signature_polymorphic(iid)) { 1128 if (is_signature_polymorphic_static(iid)) 1129 suffix = "/static"; 1130 else 1131 suffix = "/private"; 1132 } 1133 jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix); 1134 trace_method_handle(_masm, qname); 1135 // Note: Don't free the allocated char array because it's used 1136 // during runtime. 1137 } 1138 } 1139 1140 // 1141 // Here are the native methods in java.lang.invoke.MethodHandleNatives 1142 // They are the private interface between this JVM and the HotSpot-specific 1143 // Java code that implements JSR 292 method handles. 1144 // 1145 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way 1146 // that intrinsic (non-JNI) native methods are defined in HotSpot. 1147 // 1148 1149 #ifndef PRODUCT 1150 #define EACH_NAMED_CON(template, requirement) \ 1151 template(java_lang_invoke_MemberName,MN_IS_METHOD) \ 1152 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \ 1153 template(java_lang_invoke_MemberName,MN_IS_FIELD) \ 1154 template(java_lang_invoke_MemberName,MN_IS_TYPE) \ 1155 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \ 1156 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \ 1157 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \ 1158 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \ 1159 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \ 1160 /*end*/ 1161 1162 #define IGNORE_REQ(req_expr) /* req_expr */ 1163 #define ONE_PLUS(scope,value) 1+ 1164 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0; 1165 #define VALUE_COMMA(scope,value) scope::value, 1166 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 }; 1167 #define STRING_NULL(scope,value) #value "\0" 1168 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) }; 1169 1170 static bool advertise_con_value(int which) { 1171 if (which < 0) return false; 1172 bool ok = true; 1173 int count = 0; 1174 #define INC_COUNT(scope,value) \ 1175 ++count; 1176 #define CHECK_REQ(req_expr) \ 1177 if (which < count) return ok; \ 1178 ok = (req_expr); 1179 EACH_NAMED_CON(INC_COUNT, CHECK_REQ); 1180 #undef INC_COUNT 1181 #undef CHECK_REQ 1182 assert(count == con_value_count, ""); 1183 if (which < count) return ok; 1184 return false; 1185 } 1186 1187 #undef ONE_PLUS 1188 #undef VALUE_COMMA 1189 #undef STRING_NULL 1190 #undef EACH_NAMED_CON 1191 #endif // PRODUCT 1192 1193 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { 1194 #ifndef PRODUCT 1195 if (advertise_con_value(which)) { 1196 assert(which >= 0 && which < con_value_count, ""); 1197 int con = con_values[which]; 1198 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh)); 1199 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { 1200 const char* str = &con_names[0]; 1201 for (int i = 0; i < which; i++) 1202 str += strlen(str) + 1; // skip name and null 1203 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint 1204 box->obj_at_put(0, name); 1205 } 1206 return con; 1207 } 1208 #endif 1209 return 0; 1210 } 1211 JVM_END 1212 1213 // void init(MemberName self, AccessibleObject ref) 1214 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { 1215 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1216 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); } 1217 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1218 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); 1219 MethodHandles::init_MemberName(mname, target, CHECK); 1220 } 1221 JVM_END 1222 1223 // void expand(MemberName self) 1224 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1225 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1226 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1227 MethodHandles::expand_MemberName(mname, 0, CHECK); 1228 } 1229 JVM_END 1230 1231 // void resolve(MemberName self, Class<?> caller) 1232 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh, 1233 jboolean speculative_resolve)) { 1234 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); } 1235 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1236 1237 // The trusted Java code that calls this method should already have performed 1238 // access checks on behalf of the given caller. But, we can verify this. 1239 if (VerifyMethodHandles && caller_jh != NULL && 1240 java_lang_invoke_MemberName::clazz(mname()) != NULL) { 1241 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname())); 1242 if (reference_klass != NULL && reference_klass->is_objArray_klass()) { 1243 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass(); 1244 } 1245 1246 // Reflection::verify_class_access can only handle instance classes. 1247 if (reference_klass != NULL && reference_klass->is_instance_klass()) { 1248 // Emulate LinkResolver::check_klass_accessability. 1249 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1250 if (caller != SystemDictionary::Object_klass() 1251 && Reflection::verify_class_access(caller, 1252 InstanceKlass::cast(reference_klass), 1253 true) != Reflection::ACCESS_OK) { 1254 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name()); 1255 } 1256 } 1257 } 1258 1259 Klass* caller = caller_jh == NULL ? NULL : 1260 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1261 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, speculative_resolve == JNI_TRUE, 1262 CHECK_NULL); 1263 1264 if (resolved.is_null()) { 1265 int flags = java_lang_invoke_MemberName::flags(mname()); 1266 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 1267 if (!MethodHandles::ref_kind_is_valid(ref_kind)) { 1268 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format"); 1269 } 1270 if (speculative_resolve) { 1271 assert(!HAS_PENDING_EXCEPTION, "No exceptions expected when resolving speculatively"); 1272 return NULL; 1273 } 1274 if ((flags & ALL_KINDS) == IS_FIELD) { 1275 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed"); 1276 } else if ((flags & ALL_KINDS) == IS_METHOD || 1277 (flags & ALL_KINDS) == IS_CONSTRUCTOR) { 1278 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed"); 1279 } else { 1280 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed"); 1281 } 1282 } 1283 1284 return JNIHandles::make_local(THREAD, resolved()); 1285 } 1286 JVM_END 1287 1288 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) { 1289 if (mname == NULL || 1290 java_lang_invoke_MemberName::clazz(mname) == NULL) { 1291 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved"); 1292 } else { 1293 int flags = java_lang_invoke_MemberName::flags(mname); 1294 if ((flags & IS_FIELD) != 0 && 1295 (must_be_static 1296 ? (flags & JVM_ACC_STATIC) != 0 1297 : (flags & JVM_ACC_STATIC) == 0)) { 1298 int vmindex = java_lang_invoke_MemberName::vmindex(mname); 1299 return (jlong) vmindex; 1300 } 1301 } 1302 const char* msg = (must_be_static ? "static field required" : "non-static field required"); 1303 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg); 1304 return 0; 1305 } 1306 1307 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1308 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD); 1309 } 1310 JVM_END 1311 1312 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1313 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD); 1314 } 1315 JVM_END 1316 1317 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1318 // use the other function to perform sanity checks: 1319 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL); 1320 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh)); 1321 return JNIHandles::make_local(THREAD, clazz); 1322 } 1323 JVM_END 1324 1325 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1326 if (mname_jh == NULL) return NULL; 1327 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1328 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()); 1329 objArrayHandle result = oopFactory::new_objArray_handle(SystemDictionary::Object_klass(), 2, CHECK_NULL); 1330 jvalue vmindex_value; vmindex_value.j = (long)vmindex; 1331 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL); 1332 result->obj_at_put(0, x); 1333 1334 int flags = java_lang_invoke_MemberName::flags(mname()); 1335 if ((flags & IS_FIELD) != 0) { 1336 x = java_lang_invoke_MemberName::clazz(mname()); 1337 } else { 1338 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 1339 assert(vmtarget != NULL && vmtarget->is_method(), "vmtarget is only method"); 1340 x = mname(); 1341 } 1342 result->obj_at_put(1, x); 1343 return JNIHandles::make_local(env, result()); 1344 } 1345 JVM_END 1346 1347 1348 1349 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1350 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1351 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls, 1352 jclass clazz_jh, jstring name_jh, jstring sig_jh, 1353 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { 1354 if (clazz_jh == NULL || results_jh == NULL) return -1; 1355 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)); 1356 1357 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh)); 1358 if (results.is_null() || !results->is_objArray()) return -1; 1359 1360 TempNewSymbol name = NULL; 1361 TempNewSymbol sig = NULL; 1362 if (name_jh != NULL) { 1363 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); 1364 if (name == NULL) return 0; // a match is not possible 1365 } 1366 if (sig_jh != NULL) { 1367 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); 1368 if (sig == NULL) return 0; // a match is not possible 1369 } 1370 1371 Klass* caller = NULL; 1372 if (caller_jh != NULL) { 1373 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); 1374 if (!java_lang_Class::is_instance(caller_oop)) return -1; 1375 caller = java_lang_Class::as_Klass(caller_oop); 1376 } 1377 1378 if (name != NULL && sig != NULL && results.not_null()) { 1379 // try a direct resolve 1380 // %%% TO DO 1381 } 1382 1383 int res = MethodHandles::find_MemberNames(k, name, sig, mflags, 1384 caller, skip, results, CHECK_0); 1385 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks 1386 return res; 1387 } 1388 JVM_END 1389 1390 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1391 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1392 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1393 { 1394 // Walk all nmethods depending on this call site. 1395 MutexLocker mu(Compile_lock, thread); 1396 MethodHandles::flush_dependent_nmethods(call_site, target); 1397 java_lang_invoke_CallSite::set_target(call_site(), target()); 1398 } 1399 } 1400 JVM_END 1401 1402 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1403 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1404 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1405 { 1406 // Walk all nmethods depending on this call site. 1407 MutexLocker mu(Compile_lock, thread); 1408 MethodHandles::flush_dependent_nmethods(call_site, target); 1409 java_lang_invoke_CallSite::set_target_volatile(call_site(), target()); 1410 } 1411 } 1412 JVM_END 1413 1414 JVM_ENTRY(void, MHN_copyOutBootstrapArguments(JNIEnv* env, jobject igcls, 1415 jobject caller_jh, jintArray index_info_jh, 1416 jint start, jint end, 1417 jobjectArray buf_jh, jint pos, 1418 jboolean resolve, jobject ifna_jh)) { 1419 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller_jh)); 1420 if (caller_k == NULL || !caller_k->is_instance_klass()) { 1421 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad caller"); 1422 } 1423 InstanceKlass* caller = InstanceKlass::cast(caller_k); 1424 typeArrayOop index_info_oop = (typeArrayOop) JNIHandles::resolve(index_info_jh); 1425 if (index_info_oop == NULL || 1426 index_info_oop->klass() != Universe::intArrayKlassObj() || 1427 typeArrayOop(index_info_oop)->length() < 2) { 1428 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (0)"); 1429 } 1430 typeArrayHandle index_info(THREAD, index_info_oop); 1431 int bss_index_in_pool = index_info->int_at(1); 1432 // While we are here, take a quick look at the index info: 1433 if (bss_index_in_pool <= 0 || 1434 bss_index_in_pool >= caller->constants()->length() || 1435 index_info->int_at(0) 1436 != caller->constants()->bootstrap_argument_count_at(bss_index_in_pool)) { 1437 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (1)"); 1438 } 1439 objArrayHandle buf(THREAD, (objArrayOop) JNIHandles::resolve(buf_jh)); 1440 if (start < 0) { 1441 for (int pseudo_index = -4; pseudo_index < 0; pseudo_index++) { 1442 if (start == pseudo_index) { 1443 if (start >= end || 0 > pos || pos >= buf->length()) break; 1444 oop pseudo_arg = NULL; 1445 switch (pseudo_index) { 1446 case -4: // bootstrap method 1447 { 1448 int bsm_index = caller->constants()->bootstrap_method_ref_index_at(bss_index_in_pool); 1449 pseudo_arg = caller->constants()->resolve_possibly_cached_constant_at(bsm_index, CHECK); 1450 break; 1451 } 1452 case -3: // name 1453 { 1454 Symbol* name = caller->constants()->name_ref_at(bss_index_in_pool); 1455 Handle str = java_lang_String::create_from_symbol(name, CHECK); 1456 pseudo_arg = str(); 1457 break; 1458 } 1459 case -2: // type 1460 { 1461 Symbol* type = caller->constants()->signature_ref_at(bss_index_in_pool); 1462 Handle th; 1463 if (type->char_at(0) == '(') { 1464 th = SystemDictionary::find_method_handle_type(type, caller, CHECK); 1465 } else { 1466 th = SystemDictionary::find_java_mirror_for_type(type, caller, SignatureStream::NCDFError, CHECK); 1467 } 1468 pseudo_arg = th(); 1469 break; 1470 } 1471 case -1: // argument count 1472 { 1473 int argc = caller->constants()->bootstrap_argument_count_at(bss_index_in_pool); 1474 jvalue argc_value; argc_value.i = (jint)argc; 1475 pseudo_arg = java_lang_boxing_object::create(T_INT, &argc_value, CHECK); 1476 break; 1477 } 1478 } 1479 1480 // Store the pseudo-argument, and advance the pointers. 1481 buf->obj_at_put(pos++, pseudo_arg); 1482 ++start; 1483 } 1484 } 1485 // When we are done with this there may be regular arguments to process too. 1486 } 1487 Handle ifna(THREAD, JNIHandles::resolve(ifna_jh)); 1488 caller->constants()-> 1489 copy_bootstrap_arguments_at(bss_index_in_pool, 1490 start, end, buf, pos, 1491 (resolve == JNI_TRUE), ifna, CHECK); 1492 } 1493 JVM_END 1494 1495 // It is called by a Cleaner object which ensures that dropped CallSites properly 1496 // deallocate their dependency information. 1497 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) { 1498 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh)); 1499 { 1500 // Walk all nmethods depending on this call site. 1501 MutexLocker mu1(Compile_lock, thread); 1502 1503 int marked = 0; 1504 { 1505 NoSafepointVerifier nsv; 1506 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1507 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context()); 1508 marked = deps.remove_all_dependents(); 1509 } 1510 if (marked > 0) { 1511 // At least one nmethod has been marked for deoptimization 1512 VM_Deoptimize op; 1513 VMThread::execute(&op); 1514 } 1515 } 1516 } 1517 JVM_END 1518 1519 /** 1520 * Throws a java/lang/UnsupportedOperationException unconditionally. 1521 * This is required by the specification of MethodHandle.invoke if 1522 * invoked directly. 1523 */ 1524 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1525 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively"); 1526 return NULL; 1527 } 1528 JVM_END 1529 1530 /** 1531 * Throws a java/lang/UnsupportedOperationException unconditionally. 1532 * This is required by the specification of MethodHandle.invokeExact if 1533 * invoked directly. 1534 */ 1535 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1536 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively"); 1537 return NULL; 1538 } 1539 JVM_END 1540 1541 /// JVM_RegisterMethodHandleMethods 1542 1543 #undef CS // Solaris builds complain 1544 1545 #define LANG "Ljava/lang/" 1546 #define JLINV "Ljava/lang/invoke/" 1547 1548 #define OBJ LANG "Object;" 1549 #define CLS LANG "Class;" 1550 #define STRG LANG "String;" 1551 #define CS JLINV "CallSite;" 1552 #define MT JLINV "MethodType;" 1553 #define MH JLINV "MethodHandle;" 1554 #define MEM JLINV "MemberName;" 1555 #define CTX JLINV "MethodHandleNatives$CallSiteContext;" 1556 1557 #define CC (char*) /*cast a literal from (const char*)*/ 1558 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1559 1560 // These are the native methods on java.lang.invoke.MethodHandleNatives. 1561 static JNINativeMethod MHN_methods[] = { 1562 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)}, 1563 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)}, 1564 {CC "resolve", CC "(" MEM "" CLS "Z)" MEM, FN_PTR(MHN_resolve_Mem)}, 1565 // static native int getNamedCon(int which, Object[] name) 1566 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)}, 1567 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1568 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1569 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)}, 1570 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)}, 1571 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)}, 1572 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)}, 1573 {CC "copyOutBootstrapArguments", CC "(" CLS "[III[" OBJ "IZ" OBJ ")V", FN_PTR(MHN_copyOutBootstrapArguments)}, 1574 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)}, 1575 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)}, 1576 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)}, 1577 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)} 1578 }; 1579 1580 static JNINativeMethod MH_methods[] = { 1581 // UnsupportedOperationException throwers 1582 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)}, 1583 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)} 1584 }; 1585 1586 /** 1587 * This one function is exported, used by NativeLookup. 1588 */ 1589 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { 1590 assert(!MethodHandles::enabled(), "must not be enabled"); 1591 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present"); 1592 1593 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror(); 1594 jclass MH_class = (jclass) JNIHandles::make_local(env, mirror); 1595 1596 { 1597 ThreadToNativeFromVM ttnfv(thread); 1598 1599 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod)); 1600 guarantee(status == JNI_OK && !env->ExceptionOccurred(), 1601 "register java.lang.invoke.MethodHandleNative natives"); 1602 1603 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod)); 1604 guarantee(status == JNI_OK && !env->ExceptionOccurred(), 1605 "register java.lang.invoke.MethodHandle natives"); 1606 } 1607 1608 if (TraceInvokeDynamic) { 1609 tty->print_cr("MethodHandle support loaded (using LambdaForms)"); 1610 } 1611 1612 MethodHandles::set_enabled(true); 1613 } 1614 JVM_END