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